GRINDING MACHINE AND SQUARE ROD ATTITUDE ADJUSTING METHOD

Abstract

A grinding machine includes a conveying structure and a grinding structure, the conveying structure having first clamper sets for clamping a square rod. The grinding machine further includes a first top seat formed in at least one of the first clamper sets, and at least one second top seat formed in the grinding structure; the first top seat and the second top seat respectively abut against two opposite sides of the square rod; abutment surfaces of two first top seats are coplanar in a vertical plane, and are parallel to an abutment surface of the second top seat; a plane of the abutment surface of the first top seat is perpendicular to a plane of at least one abutment surface of the first clamper sets. The grinding machine according to the present disclosure may adjust the attitude of the square rod, thereby ensuring a stable grinding process.

Claims

1. A grinding machine, comprising a conveying structure and a grinding structure, the conveying structure having first clamper sets for clamping a square rod, wherein the grinding machine comprises a first top seat formed in at least one of the first clamper sets and at least one second top seat formed in the grinding structure; the first top seat and the second top seat respectively abut against two opposite sides of the square rod; an abutment surface of the first top seat is parallel to an abutment surface of the second top seat; and a plane of the abutment surface of the first top seat is perpendicular to a plane of at least one abutment surface of the first clamper sets.

2. The grinding machine according to claim 1, wherein the grinding structure comprises an independent adjusting platform, and the second top seat is disposed on the adjusting platform.

3. The grinding machine according to claim 1, wherein the grinding structure comprises upper and lower tightening structures arranged coaxially, and a mounting frame; the upper tightening structure is mounted on a first vertical displacement platform, and the mounting frame is connected to and moves synchronously with the upper tightening structure; the second top seat is provided on the upper tightening structure; at least one grinding wheel is on either of opposite sides perpendicular to a length direction of the first vertical displacement platform, and the grinding wheel is connected to a first lateral displacement platform and a second vertical displacement platform.

4. The grinding machine according to claim 1, wherein at least two first top seats are provided, and the first top seats are vertically spaced apart.

5. The grinding machine according to claim 3, wherein the grinding wheel is selected from face grinding wheels and/or chamfer grinding wheels.

6. The grinding machine according to claim 5, wherein the grinding wheel comprises an inner ring structure and an outer ring structure, and a second lateral displacement platform connected to the inner ring structure; side surfaces of the outer ring structure and the inner ring structure close to the square rod are both frosted surfaces, and a grain size of the frosted surface of the inner ring structure is different from the grain size of the frosted surface of the outer ring structure; the second lateral displacement platform is configured to drive the frosted surface of the inner ring structure to protrude out of a plane of the frosted surface of the outer ring structure.

7. The grinding machine according to claim 5, wherein the mounting frame is provided with at least one grinding wheel abrasion loss detection sensor that detects a thickness of the frosted surface by contacting the frosted surface of the grinding wheel.

8. The grinding machine according to claim 3, wherein the first lateral displacement platform is accommodated in a grinding housing, and the grinding housing has a width detection sensor therein for detecting a width of the square rod, and a third lateral displacement platform connected to the width detection sensor.

9. The grinding machine according to claim 8, wherein the mounting frame has at least one correction surface on which the width detection sensor is corrected with a detection head thereof abutting against the correction surface.

10. The grinding machine according to claim 9, wherein the mounting frame has at least one first nozzle disposed with a discharge direction toward the correction surface.

11. The grinding machine according to claim 8, further comprising a second nozzle mounted on the grinding housing, and the second nozzle has a discharge direction toward a side of the square rod.

12. The grinding machine according to claim 3, wherein the lower tightening structure is connected to a driving structure for driving the lower tightening structure to rotate about an axis of the lower tightening structure.

13. The grinding machine according to claim 1, wherein the conveying structure comprises a rotating body, and at least one loading structure and an unloading structure respectively provided on either side of the rotating body; wherein the rotating body has a vertical rotation axis, and the rotating body rotates about the vertical rotation axis to switch between the loading structure and the unloading structure; the loading structure comprises at least one of the first clamper sets, and the loading structure clamps the square rod by the first clamper set and moves the square rod into the grinding structure; the unloading structure comprises at least one of second clamper sets, and the unloading structure takes the square rod out of the grinding structure by the second clamper sets.

14. The grinding machine according to claim 13, wherein the first clamper set comprises two oppositely disposed clampers and a fifth lateral displacement platform for driving relative movement of the two clampers, the first top seat being positioned between the two clampers.

15. The grinding machine according to claim 13, wherein the first clamper sets comprise at least two clamper sets vertically spaced apart, and the clamper set comprises two oppositely disposed clampers, with at least two of the first top seats being respectively disposed in different clamper sets and each between two of the clampers in the clamper set.

16. The grinding machine according to claim 14, wherein the clamper has an abutment surface through which the clamper abuts against the side of the square rod, a plane of the abutment surface of the clamper being perpendicular to the plane of the abutment surface of the first top seat.

17. The grinding machine according to claim 13, wherein a switch is provided in the first clamper set; the switch comprises a movable arm and is associated with the first clamper set, and the first clamper set clamps the square rod when the arm is pushed and rotated by the square rod to a predetermined angle.

18. The grinding machine according to claim 1, wherein the second top seat is a floating pressure head.

19. A square rod attitude adjusting method based on the grinding machine according to claim 1, comprising: regulating an attitude of the square rod by using at least two first top seats and at least one second top seat.

20. The square rod attitude adjusting method according to claim 19, further comprising: releasing the first clamper sets from holding the square rod such that the square rod is dropped onto a support structure; adjusting the attitude of the square rod on the support structure by the first and second top seats; and clamping the square rod again by the first clamper sets.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG. 1 is a schematic view showing a structure of a grinding machine according to an embodiment of the present disclosure.

[0043] FIG. 2 is a schematic view of the grinding machine of FIG. 1 with an outer housing and a conveying structure omitted.

[0044] FIG. 3 is a schematic view showing the structure of the grinding machine of FIG. 1 with the outer housing and a grinding wheel structure omitted.

[0045] FIG. 4 is a schematic view showing the structure of the grinding machine of FIG. 3 with a cover plate omitted.

[0046] FIG. 5 is a schematic view showing a structure of the grinding wheel structure according to an embodiment of the present disclosure.

[0047] FIG. 6 is a schematic view showing a structure of the conveying structure according to an embodiment of the present disclosure from a perspective.

[0048] FIG. 7 is an enlarged view of a portion A of FIG. 6.

[0049] FIG. 8 is a schematic view showing the structure of the conveying structure according to an embodiment of the present disclosure from another perspective.

[0050] FIG. 9 is an enlarged view of a portion B of FIG. 3.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] In order to explain the technical content, the object, and the effects of the present disclosure in detail, the embodiments will be described below with reference to the accompanying drawings.

[0052] The grinding machine according to the present disclosure may enable the grinding treatment of a side surface and/or a chamfered surface of a square rod (featuring a square or rectangular cross section). The square rod is processed from a round rod by a shaping machine. In a preferred embodiment, both the square and round rods are single-crystal silicon rods. It should be noted that, to facilitate the description, the square rods mentioned hereinafter all refer to single-crystal silicon rods having a square cross section.

[0053] In the prior art, as shown in FIG. 1 of CN217143334 U, in the case where a square rod is moved by a loading mechanism to a conveying mechanism to be clamped by clampers thereof, the square rod, even though clamped by the clampers, may inevitably tilt forward (towards the conveying structure) or backward (towards the loading structure) because there is no corresponding top tightening structure or bottom supporting structure; in addition, when the square rod is conveyed, and clamped by a clamping mechanism (including an upper clamping piece and a lower clamping piece), it is fixed and adjustable in attitude only between the opposite sides at which the clampers clamp, while in the directions of the other two sides it may still inevitably tilt to rotate. Moreover, it should be noted that although axially clamped by the upper clamping piece and the lower clamping piece, the square rod may be adjustable in its attitude as a whole to a certain extent, but the flatness of the cut surfaces (top surface and bottom surface) on both sides of the square rod (raw material) can hardly be ensured, that is, uneven or discontinuous cutting surfaces are inevitable. Therefore, in a continuous automatic production process, even though axially clamped by the upper and lower clamping pieces, the square rod can hardly keep a vertical attitude, that is, it is difficult to ensure that all products reach the grinding endpoint.

[0054] In view of this, a grinding machine is provided, and with reference to FIGS. 2 to 4, 6, 7, and 9, at least one second top seat 37 is provided in the grinding structure of the grinding machine, and at least one first top seat 221 is provided in the conveying structure 2, two-point cooperation is between one second top seat and one first top seat to realize the adjustment of the other two side surfaces (not clamped by clampers) of the square rod, thereby ensuring that when clamped by an upper tightening structure 38 (as the above-mentioned upper clamping piece) and a lower tightening structure 34 (as the above-mentioned lower clamping piece), the square rod as a whole is in a vertical attitude (with its axis in a vertical state, or four crystal lines, i.e., edge lines, approximately vertical), which may ensure that the product reaches the grinding end point. Apparently, more first and second top seats favor a more satisfactory adjustment of the attitude of the square rod to be vertical. Thus, in a practical scenario, two first top seats are provided and one second top seat is provided so that a three-point cooperation is formed to render a more accurate adjustment of the attitude of the square rod to be vertical. It should be noted that, to facilitate the drafting, the above-mentioned three-point cooperation will be the case in the following description, but it should be clear that the present disclosure is not limited to the case of three-point cooperation or two-point cooperation, and any other number and cooperation form of the first top seats and the second top seats are within the scope of the present disclosure.

[0055] Specifically, with reference to FIGS. 1 to 4, 6, 7 and 9, the grinding machine includes a conveying structure 2 and a grinding structure; the conveying structure 2 has first clamper sets 22 for clamping a square rod; the grinding machine further includes at least two vertically spaced-apart first top seats 221 formed in the first clamper sets, and at least one second top seat 37 formed in the grinding structure; the first top seat and the second top seat respectively abut against two opposite sides of the square rod; an abutment surface 2211 of the first top seat is parallel to an abutment surface 371 of the second top seat; a plane of the abutment surface of the first top seat is perpendicular to a plane of at least one abutment surface 2221 of the first clamper sets.

[0056] In a specific process, when a square rod is conveyed to a clamping position of the conveying structure by a loading/unloading structure (see CN217143334 U or CN218658388 U, for example), the loading/unloading structure turns the square rod over so that the square rod is in a substantially vertical state, whereby a clamper of the conveying structure is facilitated in clamping the square rod from opposite sides of the square rod. In the prior art, to improve the stability of a clamper to clamp a square rod, a clamping surface (the above-mentioned abutment surface) of the clamper is generally of a planar design, that is, when two clampers simultaneously clamp the square rod, the attitude of the square rod between the two opposite sides is adjusted by the clampers to be in a substantially vertical state, whereas the other two sides thereof are in an unsupported state, i.e., the square rod may tilt and rotate inwards or outwards to a certain extent between the other two sides. Moreover, practically, when the square rod is turned over by using the loading/unloading structure, the square rod inevitably undergoes shaking, which directly causes difficulty in holding the square rod in place by the first clamper sets. Thus, when the first top seat is mounted in the first clamper set, the first clamper set adjusts the attitude between opposite sides of the square rod, before which, when the square rod is being loaded into the first clamper set, the square rod is forced to move towards the first top seat by a lateral thrust exerted by the loading/unloading structure; and when a side thereof is abutted by two first top seats, the attitude on the side is adjusted, thereby substantially adjusting the attitude of the square rod to the vertical state.

[0057] It will be appreciated that the amount of displacement of the square rod being loaded into the first clamper set by the loading/unloading structure determines the effect for the first top seat to adjust the attitude on one side of the square rod. If the amount of displacement is too small, then one side of the square rod is not abutted by the first top seat, hence the square rod is liable to tilt and rotate on this side. Therefore, an appropriate amount of displacement is important for the first top seat to adjust the attitude of the square rod on one side. In an alternative embodiment, as shown in FIG. 6 or 7, a displacement detection sensor 223 for detecting the amount of displacement of the square rod loaded into the first clamper sets, i.e., a distance between one side of the square rod and the abutment surface 2211 of the first top seat, is installed in the first clamper sets. Specifically, referring to FIG. 7, the displacement detection sensor includes a mounting seat for mounting on the conveying structure in the first clamper sets, and an arm 2231 rotatably disposed on the mounting seat about a Z-axis. When a side of the square rod abuts the arm, the arm is pushed by the square rod to rotate, and when the rotation reaches a preset value or is greater than the preset value, a determination is made that the square rod has an appropriate amount of displacement, that is, it is the time to start the clamping process of the first clamper sets.

[0058] Note that the second top seat is fixedly or movably installed at a relative position where the attitude of the silicon rod (the aforementioned square rod) is adjusted to a vertical state. Specifically, the second top seat is movably installed on the grinding mechanism, and when the silicon rod is adjusted, the second top seat can be moved to a relative position at the same height as the first top seat, so that the silicon rod can be adjusted. When two first top seats are provided on the clamper sets, and the two first top seats are arranged at intervals in one vertical direction, the second top seat is moved to a relative position between the heights of the two first top seats to adjust the silicon rod, hence the silicon rod is uniformly stressed and can be better adjusted to the vertical state. When there are three first top seats, they are arranged at intervals in one vertical direction, and the second top seat is moved to a position opposite that of the middle one of the first top seats so as to adjust the silicon rod. When there are a plurality of second top seats, the same reasoning shall be applicable and will not be repeated here. It will be appreciated that, in practice, the second top seat may also be fixedly mounted in a relative position to allow the silicon rod to be adjusted to the vertical state, and the manner in which it may be moved or fixedly mounted may be adjusted in accordance with the actual device structure and production requirements.

[0059] In another alternative embodiment, the displacement detection sensor is replaced by a switch associated with the first clamper sets. The switch is opened when a movable arm of the switch is pushed by the square rod to rotate to a preset angle, i.e., to start the process of clamping the square rod by the first clamper sets. It will be appreciated that in this embodiment the switch is taken to feedback that the position of the square rod is adjusted in place during three-point positioning.

[0060] However, existing conveying structures, like in CN217143334 U, are designed to achieve switching between the loading and unloading clampers through lateral rotation. In a practical scenario, where the square rod is clamped by the first clamper sets 22 and is abutted by the first top seat 221, since the other side of the square rod (with respect to the opposite side which is abutted by the first top seat) is not limited by any structure, the square rod inevitably tilts and rotates again due to the centrifugal force during the synchronous rotation of the square rod with the conveying structure 2. On this basis, a second top seat 37 cooperating with the first top seats is further provided in the grinding structure, so that the attitude of the square rod is generally adjusted to a vertical state when the square rod is clamped by the upper tightening structure 38 and the lower tightening structure 34 through the cooperation of the three seats. Specifically, referring to FIGS. 2 to 4, 6, and 7, when the square rod is rotated to a loading position by the conveying structure 2, the square rod is driven by the conveying structure to move towards the second top seat 37 until the other side of the square rod (with respect to the opposite sides abutted by the first top seat) is abutted by the second top seat, the attitude of the square rod between the two sides (the opposite sides abutted by the first top seats) is adjusted. After the attitude of the square rod is integrally adjusted, both axial ends of the square rod are clamped by the upper tightening structure 38 and the lower tightening structure 34. For a better holding of the square rod by the second top seat, preferably, the second top seat is a floating pressure head.

[0061] In an alternative embodiment, the grinding structure includes an independent adjusting platform on which the second top seat is disposed. The adjusting platform is independent of the grinding wheel and the clamping fixtures (such as the lower tightening structure and the upper tightening structure described below) in the grinding structure, and is positioned at any position in the path through which the conveying structure moves the square rod to the clamping fixtures. That is, during the conveyance of the square rod, after the vertical attitude of the square rod in the adjusting platform is adjusted by the second top seat, the square rod is conveyed to the clamping fixtures and clamped by the clamping fixtures. However, the setting of the adjusting platform results in an extended path of conveying the square rod and an increased probability of the square rod rotating again during the conveying process, and therefore, in a more compact embodiment of the structure, as shown in FIGS. 2 to 4 and 9, the grinding structure includes the upper tightening structure 38 and the lower tightening structure 34 arranged coaxially, and a mounting frame 33; the upper tightening structure is mounted on a first vertical displacement platform 331, and the mounting frame is connected to and moves synchronously with the upper tightening structure; the second top seat 37 is provided on the upper tightening structure 38; at least one grinding wheel (35, 36) is respectively provided on either of two opposite sides perpendicular to a length direction of the first vertical displacement platform, and the grinding wheel is connected to a first lateral displacement platform and a second vertical displacement platform 321. In this embodiment, the upper tightening structure and the lower tightening structure are used for fixing both axial ends of the square rod, and controlling a travel direction of the grinding wheel by at least one grinding wheel in cooperation with the first lateral displacement platform and the second vertical displacement platform that are independent of the grinding wheel, so as to grind the side and/or chamfered surfaces of the square rod. Thus, in this embodiment, the grinding wheel is selected from a face grinding wheel 35 and/or a chamfer grinding wheel 36, preferably a combination of the face grinding wheel and the chamfer grinding wheel, the face grinding wheel being directed towards the side of the square rod and the chamfer grinding wheel being arranged towards the chamfered surface of the square rod as shown with reference to FIGS. 2 and 5.

[0062] In an alternative embodiment, illustrated with reference to FIG. 5 (exemplified with the face grinding wheel), the grinding wheel includes an inner ring structure 352 and an outer ring structure 351, and a second lateral displacement platform connected to the inner ring structure. Side surfaces of the outer ring structure and the inner ring structure close to the square rod are both frosted surfaces, and a grain size of the frosted surface of the inner ring structure is different from the grain size of the frosted surface of the outer ring structure; the second lateral displacement platform is configured to drive the frosted surface of the inner ring structure to protrude out of a plane of the frosted surface of the outer ring structure. In a preferred embodiment, the grain size of the frosted surface of the inner ring structure is smaller than the grain size of the frosted surface of the outer ring structure. In this embodiment, since the grain size of the frosted surface of the inner ring structure is smaller than the grain size of the frosted surface of the outer ring structure, the side surface or the chamfered surface of the square rod can be finely ground by using the inner ring structure, and the side surface or the chamfered surface of the square rod can be roughly ground by using the outer ring structure. The second lateral displacement platform drives the inner ring structure within the outer ring structure to protrude therefrom, so as to switch between the fine grinding process and the rough grinding process.

[0063] The thickness of the frosted surface of the grinding wheel is inevitably reduced after a long time of operation, and the reduction of the thickness directly reflects the reduction of the service life of the frosted surface of the grinding wheel and the reduction of the grinding effect of the frosted surface of the grinding wheel to some extent, which directly affects the effectiveness of the grinding process. Therefore, it is necessary to detect the abrasion loss of the grinding wheel regularly or quantitatively in practical application scenarios. The detection of the abrasion loss of the grinding wheel in the prior art is generally performed manually, during which the production is seriously disturbed. Accordingly, in an embodiment, as shown in FIGS. 3, 4, and 9, the mounting frame 33 is provided with at least one grinding wheel abrasion loss detection sensor 333 that detects the thickness of the frosted surface by contacting the frosted surface of the grinding wheel (35, 36), that is, the grinding wheel abrasion loss detection sensor is mounted on the mounting frame to detect the frosted surface of the grinding wheel inside the grinding machine, thereby facilitating the detection process.

[0064] In an embodiment, as shown in FIGS. 2 and 5, the first lateral displacement platform is accommodated in a grinding housing 32 having a width detection sensor 324 therein for sensing a width of the square rod, and a third lateral displacement platform connected to the width detection sensor. In this embodiment, the width detection sensor is used for detecting a width of the side surface and the chamfered surface of the square rod. In a preferred embodiment, as shown in FIG. 2, the width detection sensors 324 are provided in two groups, respectively on opposite sides of the square rod; through simultaneous detections of the widths between opposite sides of the square rod or between opposite chamfered surfaces (the width between the opposite chamfered surfaces or a so-called diameter), a maximum width and a minimum width of the square rod are obtained; the machining allowance and the number of machining cuts are determined on the maximum width, and whether the square rod needs subsequent grinding process is determined on the minimum width.

[0065] In an alternative embodiment, as shown in FIGS. 2 and 5, the grinding housing 32 has an opening 322 for a detection head of the width detection sensor 324 to pass out of the grinding housing, and a detection shutter 323 for controlling the opening to be opened or closed. In this embodiment, the width sensing process is performed by providing the opening in the grinding housing so that the detection head of the width detection sensor extends out of the grinding housing and conducts the width sensing process, and the detection head of the width detection sensor is facilitated to be retracted within the grinding housing during the grinding process to avoid interference of the width detection sensor with other grinding components during the grinding process; the opening is opened and closed by the detection shutter to avoid contaminating internal components of the grinding housing by grinding impurities entering the grinding housing through the opening during the grinding process.

[0066] In an embodiment, as shown in FIGS. 4 and 9, the mounting frame 33 has at least one correction surface 334 on which the width detection sensor 324 is corrected with its detection head abutting against thereon. In a preferred embodiment, as shown in FIGS. 4, 5 and 9, the correction surface 334 is a side of the mounting frame 33 facing the width detection sensor 324. In order to avoid the adhesion of grinding impurities on the correction surface affecting the performance of the correction process, it is preferred that at least one first nozzle 332 is provided above the correction surface, with a discharge direction toward the correction surface so as to clean the correction surface when blown by the first nozzle.

[0067] In an embodiment, as shown in FIGS. 1 to 4, the grinding machine further includes a balance bar 4 having an oil and gas supply. The balance bar is connected to the grinding housing 32, and a length direction of the balance bar is parallel to a driving direction of the second vertical displacement platform. In this embodiment, the oil and gas supply of the balance bar is stored in a storage bottle that communicates with the balance bar, and the oil and gas inside the balance bar are taken to balance against the gravity force during the vertical movement of the grinding housing and grinding members or the like carried therein.

[0068] In the grinding process of the grinding machine, the grinding impurities may easily adhere to the surface of the square rod, and therefore, it is preferable to provide a second nozzle 325 in the grinding machine, directed towards the side surface of the square rod as shown in FIG. 2 and, more preferably, mounted on the grinding housing 32, so as to continuously blow air against the side surface of the square rod during the grinding process, thereby cleaning the surface of the square rod.

[0069] In an embodiment, as shown in FIGS. 2 to 4, the lower tightening structure 34 is connected to a driving structure 341 for driving the lower tightening structure to rotate about its axis. That is, in this embodiment, the driving structure is mounted on the lower tightening structure, and the lower tightening structure is driven to rotate by the driving structure, so as to indirectly drive the square rod clamped by the lower tightening structure and the upper tightening structure to rotate, thereby achieving multi-surface width measurement of the square rod, and switchable grinding of multiple side or chamfered surfaces.

[0070] In an embodiment, as shown with reference to FIG. 1, the grinding machine further includes an outer housing 1. The grinding structure is accommodated in the outer housing, a side of the outer housing close to the conveying structure has a loading port, and the loading port is provided with a rolling shutter structure 11 for controlling the loading port to be opened or closed. Herein, the outer housing is adapted to receive and shield the grinding structure to avoid diffusion of grinding impurities in the environment. The rolling shutter structure is used for controlling the loading port to be opened or closed so as to avoid the diffusion of grinding impurities from the loading port while the loading and unloading processes are going on.

[0071] It can be seen from the foregoing that in the loading process of the conveying structure, the conveying structure laterally conveys the square rod into the grinding structure so that one side surface of the square rod is abutted and supported by the second top seat, thus in an alternative embodiment, as shown in FIGS. 1 to 4, the grinding machine further includes a fourth lateral displacement platform 31; the conveying structure 2 is mounted on the fourth lateral displacement platform, and the fourth lateral displacement platform is used for driving the conveying structure to move towards the loading port, that is, the conveying structure performs the aforementioned lateral conveyance driven by the fourth lateral displacement platform.

[0072] In an embodiment, with reference to FIGS. 1, 3, 4, and 6 to 8, the conveying structure 2 includes a rotating body 21, and at least one loading structure and at least one unloading structure respectively arranged on either side of the rotating body. Herein, the rotating body has a vertical rotation axis (Z-axis), and the rotating body rotates about the vertical rotation axis to switch between the loading structure and the unloading structure; the loading structure includes at least one of the first clamper sets 22, and the loading structure clamps the square rod by the first clamper set 22 and moves the square rod into the grinding structure; the unloading structure includes at least one of second clamper sets, and the unloading structure takes the square rod out of the grinding structure by the second clamper sets 23. Herein, the first clamper sets are used for conveying an original square rod (not ground) to a grinding structure for a grinding treatment, namely, the loading process, and the second clamper sets are used for removing the ground square rod from the grinding structure and conveying same to the above-mentioned loading/unloading structure, namely, the unloading process. The switching between the loading process and the unloading process is achieved by rotating the rotating body about the vertical rotation axis thereof. In an alternative embodiment, illustrated with reference to FIGS. 6 and 7, the first clamper set 22 includes two clampers 222 arranged opposite each other, between which the first top seat 221 is positioned, and a fifth lateral displacement platform 225 for driving the two clampers to move relative to each other. Herein, the clamper has an abutment surface 2221 by which the clamper abuts against the side surface of the square rod, and a plane of the abutment surface of the clamper is perpendicular to the plane of the abutment surface of the first top seat.

[0073] In another alternative embodiment, illustrated in FIGS. 6 and 7, the first clamper sets 22 include at least two vertically spaced clamper sets, each including two oppositely disposed clampers 222; at least two first top seats 221 are respectively disposed in different clamper sets, each between two of the clampers in the clamper sets. Herein, the clamper has the abutment surface 2221 by which the clamper abuts against the side surface of the square rod, and the plane of the abutment surface of the clamper is perpendicular to the plane of the abutment surface of the first top seat.

[0074] In a preferred embodiment, shown in FIGS. 6 and 7, a support structure is provided below the first clamper sets 22. The support structure includes support plates 224 respectively provided below the two clampers 222, and at least a part of an inner side of the support plate is an outwardly curved circular arc surface 2241; a minimum spacing between two support plates is less than that between two the clampers, and the width of the square rod is between a minimum width and a maximum width of the two circular arc surfaces.

[0075] In another preferred embodiment, shown with reference to FIGS. 6 and 7, a support structure is arranged below the lowermost clamper set. The support structure includes the support plates 224 respectively arranged below two of the clampers 222, and the inner side of at least a part of the support plate is the outwardly curved circular arc surface 2241; the minimum spacing between the two support plates is less than the spacing between two the clampers, and the width of the square rod is between the minimum width and the maximum width of the two circular arc surfaces.

[0076] A square rod attitude adjusting method based on the aforementioned grinding machine, including: regulating an attitude of the square rod by using at least two first top seats and at least one second top seat.

[0077] Specifically, the square rod attitude adjusting method further includes: [0078] releasing the first clamper sets from holding the square rod such that the square rod is dropped onto a support structure; [0079] adjusting the attitude of the square rod on the support structure by the first and second top seats; and [0080] clamping the square rod again by the first clamper sets.

[0081] Herein, the support structure serves as an auxiliary support for the square rod during the loading process. Specifically, when the conveying structure 2 moves the raw square rod to the loading position, the upper tightening structure 38 is moved down until its second top seat 37 is in a proper position, for the three-point positioning of the square rod by means of at least one second top seat 37 and at least two first top seats 221, so as to adjust the attitude of the square rod, as shown with reference to FIGS. 3, 4, and 9. However, if the attitude adjustment is forced onto two sides of the square rod, the other two sides of the square rod will be inevitably damaged by the clamper because the other two sides of the square rod are clamped by the clampers 222 in this process, which is undesirable in the production. Therefore, to facilitate the adjustment on both sides of the square rod, it is preferred that the clampers release the square rod slightly before it is adjusted, that is, in the process, the clampers release the square rod so that a bottom side of the square rod is supported by the support structure. After this, the conveying structure 2 moves laterally, bringing one side of the square rod close to the second top seat 37 for the three-point positioning. When the three-point positioning is completed, the clampers clamp the square rod, and after the upper tightening structure is reset, the square rod is placed on the lower tightening structure, waiting for the upper tightening structure to move down again and abut against the top of the square rod.

[0082] In an alternative embodiment, with reference to FIG. 8, the second clamper sets 23 includes two clampers 231, and a sixth lateral displacement platform 232 for driving the relative movement of the two clampers; the abutment surface of one of the clampers is of planar design, and the abutment surface of the other of the clampers is provided with a floating joint 233, by means of which the clamper abuts on the side of the square rod, so as to improve the stability of the clamp holding the square rod.

[0083] It should be noted herein that the first vertical displacement platform, the second vertical displacement platform, the first lateral displacement platform, the second lateral displacement platform, the third lateral displacement platform, the fourth lateral displacement platform, the fifth lateral displacement platform, and the sixth lateral displacement platform are all common structures, such as a conventional motor, lead screw, sliding rail, sliding block, or air cylinder. Existing mechanisms in the prior art capable of realizing the directional displacement function of the above-mentioned displacement platforms are all applicable herein.

[0084] It should also be noted that the sensors referred to herein, including the width detection sensor, the abrasion loss detection sensor, and the displacement detection sensor, are conventional structures, and that conventional mechanisms capable of performing the aforementioned functions are applicable herein.

[0085] The above description is only examples of the present disclosure, and is not intended to limit the patent scope of the present disclosure. All equivalent variations based on the description and drawings of the present disclosure, directly or indirectly used in related technical fields, shall equally fall within the scope of the present disclosure.