LEVER INDICATOR

Abstract

The lever indicator includes a housing, a measuring lever, a displacement sensor and a microcontroller. After extending to the interior of the housing, a tail end of the measuring lever synchronously swings with the displacement sensor for measurement. The microcontroller is located in the housing, and amends and calculates a measurement result according to a signal generated by the swinging of the displacement sensor, and a liquid crystal display for displaying the measurement result is further arranged outside the housing. The displacement sensor includes a fixing grid and a moving grid of a sector structure. The fixing grid is fixed inside the housing, and is correspondingly located above the tail end of the measuring lever. The moving grid is fixed onto the tail end of the measuring lever and swings relative to the fixing grid after linked with the measuring lever.

Claims

1. A lever indicator, comprising a housing, a measuring lever, a displacement sensor, and a microcontroller, wherein the displacement sensor is located inside the housing, wherein the measuring lever is rotatably mounted on the housing, wherein a front end of the measuring lever extends out of the housing to be provided with a measuring contactor, wherein, after extending to an interior of the housing, a tail end of the measuring lever synchronously swings with the displacement sensor for measurement, wherein the microcontroller is located in the housing, and amends and calculates a measurement result according to a signal generated by swinging of the displacement sensor, wherein a liquid crystal display for displaying the measurement result is further arranged outside the housing, wherein the displacement sensor is any one of a capacitive grid sensor, a magnetic grid sensor or a CCD displacement sensor, wherein the displacement sensor is comprised of a fixing grid and a moving grid of a sector structure, wherein the fixing grid is fixed in the housing and is correspondingly located above the tail end of the measuring lever, and wherein the moving grid is fixed onto the tail end of the measuring lever and swings relative to the fixing grid after linked with the measuring lever.

2. The lever indicator of claim 1, further comprising: an anti-slanting-swinging mechanism for limiting slanting swinging of the measuring lever in a rotating process being arranged at a position, corresponding to the measuring lever or a rotary center of the measuring lever, on the housing.

3. The lever indicator of claim 2, wherein the measuring lever comprises a first-stage lever and a second-stage lever which are arranged at a front portion and a rear portion of the housing in the axial direction, wherein a middle portion of the first-stage lever is rotatably mounted at an end of the housing, wherein a front end of the first-stage lever extends out of the housing to be connected to the measuring contactor, wherein a tail end of the first-stage lever corresponds to a front portion of the second-stage lever, wherein a rotary center shaft enabling the second-stage lever to rotate inside the housing is arranged at the front portion of the second-stage lever, wherein stirring pins keeping rotating in the same direction after being stirred by the tail end of the first-stage lever from different directions are arranged at the front portion of the second-stage lever and are corresponding to front and rear sides of the rotary center shaft, respectively, wherein the moving grid is fixed onto a tail end of the second-stage lever, and wherein an anti-slanting-swinging mechanism configured to limit slanting swinging of the rotary center shaft in a rotating process of the second-stage lever is arranged on the housing to limit slanting swinging of the second-stage lever in the rotating process, so as to ensure a constant gap between the fixing grid and the moving grid.

4. The lever indicator of claim 3, wherein the anti-slanting-swinging mechanism comprises two limiting screws, wherein a fixing plate on which the top of the rotary center shaft is rotatably mounted is arranged in the housing, and is correspondingly located above the rotary center shaft, wherein the bottom of the rotary center shaft is rotatably mounted at a corresponding position on the housing, wherein one of the limiting screws is mounted in the housing, is correspondingly located below the moving grid, and upwardly abuts against the bottom of the moving grid, and wherein the other of the limiting screws is located on the fixing plate, and downwardly abuts against an upper surface of the first-stage lever.

5. The lever indicator of claim 3, wherein the anti-slanting-swinging mechanism comprises two deep-groove ball bearings for limiting the slanting swinging of the rotary center shaft in the horizontal direction and in the vertical direction, and wherein the two deep-groove ball bearings are located in the housing, are corresponding to an upper position and a lower position of the rotary center shaft, and sleeve an upper portion and a lower portion of the rotary center shaft, respectively.

6. The lever indicator of claim 3, wherein the anti-slanting-swinging mechanism comprises two thrust ball bearings for limiting the slanting swinging of the rotary center shaft in the horizontal direction and in the vertical direction, and wherein the two thrust ball bearings are located in the housing, are corresponding to an upper position and a lower position of the rotary center shaft, and sleeve an upper portion and a lower portion of the rotary center shaft, respectively.

7. The lever indicator of claim 3, wherein the anti-slanting-swinging mechanism comprises two limiting shafts for limiting the slanting swinging of the rotary center shaft in the horizontal direction and in the vertical direction, wherein a fixing plate on which the top of the rotary center shaft is rotatably mounted is arranged in the housing, and is correspondingly located above the rotary center shaft, wherein the bottom of the rotary center shaft is rotatably mounted at a corresponding position on the housing, and wherein the two limiting shafts are parallelly arranged in the housing and are corresponding to an upper position and a lower position of a middle portion of the second-stage lever.

8. The lever indicator of claim 3, wherein the anti-slanting-swinging mechanism is a guiding groove matching the tail end of the second-stage lever, wherein a fixing plate on which the top of the rotary center shaft is rotatably mounted is arranged in the housing, and is correspondingly located above the rotary center shaft, wherein the bottom of the rotary center shaft is rotatably mounted at a corresponding position on the housing, wherein the guiding groove is located at a position corresponding to the tail end of the second-stage lever in the housing, and wherein the tail end of the second-stage lever reaches the interior of the guiding groove after extending outside the bottom of the moving grid.

9. The lever indicator of claim 3, further comprising a wire which recognizes a direction in which the first-stage lever stirs the second-stage lever, wherein the bottom of the stirring pin close to the moving grid is erected on the second-stage lever through an insulating sleeve, wherein one end of the wire is connected to the fixing grid, wherein the other end of the wire is connected to the stirring pin close to the moving grid, wherein the fixing grid, the wire, the stirring pin close to the moving grid and the first-stage lever form a connected signal circuit or a disconnected signal circuit when the first-stage lever stirs the second-stage lever in different directions, and wherein the microcontroller recognizes the direction in which the first-stage lever stirs the second-stage lever according to the connection and disconnection of the signal circuit, and amends a manufacturing or assembling error of components on two sides of the rotary center shaft in the axial direction of the housing.

10. The lever indicator of claim 2, wherein the measuring lever is a first-stage measuring lever, wherein the moving grid is fixed onto a tail end of the first-stage measuring lever, wherein the anti-slanting-swinging mechanism comprises two limiting screws, wherein a fixing plate on which the top of the rotary center shaft is rotatably mounted is arranged in the housing, and is correspondingly located above the rotary center shaft, wherein the bottom of the rotary center shaft is rotatably mounted at a corresponding position on the housing, wherein one of the limiting screws is mounted in the housing, is correspondingly located below the moving grid, and upwardly abuts against the bottom of the moving grid, and wherein the other of the limiting screws is located on the fixing plate, and downwardly abuts against an upper surface of the first-stage lever.

11. The lever indicator of claim 10, further comprising: a wire which recognizes a swinging direction of the first-stage lever, wherein a supporting plate is rotatably arranged in the housing through a rotating shaft, and is correspondingly located below a rear portion of the first-stage lever, wherein a fixing plate on which the top of the rotating shaft is rotatably mounted is arranged in the housing, and is correspondingly located above the rotating shaft, wherein the bottom of the rotating shaft is rotatably mounted at a corresponding position on the housing, wherein stirring pins stirred by the first-stage lever from different directions are upwardly erected on the supporting plate, and are corresponding to two sides in the axial direction of a rotating center of the supporting plate, wherein the bottom of the stirring pin close to the moving grid is erected on the supporting plate through an insulating sleeve, wherein one end of the wire is connected to the fixing grid, wherein the other end of the wire is connected to the stirring pin close to the moving grid, wherein the fixing grid, the wire, the stirring pin close to the moving grid and the first-stage lever form a connected signal circuit or a disconnected signal circuit when the first-stage lever stirs the supporting plate in different directions, and wherein the microcontroller recognizes the swinging direction of the first-stage lever according to the connection and disconnection of the signal circuit, and amends a manufacturing or assembling error of components on two sides of a rotary center of the first-stage lever in the axial direction of the housing.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0030] FIG. 1 is an exploded schematic view of a first embodiment.

[0031] FIG. 2 is a top plan view of the first embodiment with such components as an upper cover and a fixing grid on the housing removed.

[0032] FIG. 3 is a sectional view taken along A-A of FIG. 2.

[0033] FIG. 4 is a three-dimensional schematic view of FIG. 2 with a fixing plate removed.

[0034] FIG. 5 is an exploded schematic view of a second embodiment (with such components as the upper cover and a lower cover of the housing, and a liquid crystal display removed).

[0035] FIG. 6 is a top plan view of the second embodiment with the upper cover of the housing removed.

[0036] FIG. 7 is a sectional view taken along A-A of FIG. 6.

[0037] FIG. 8 is an exploded schematic view of a third embodiment (with such components as the upper cover and the lower cover of the housing and the liquid crystal display removed).

[0038] FIG. 9 is a top plan view of the third embodiment with the upper cover of the housing removed.

[0039] FIG. 10 is a sectional view taken along A-A of FIG. 9.

[0040] FIG. 11 is an exploded schematic view of a fourth embodiment (with such components as the upper cover and the lower cover of the housing and the liquid crystal display removed).

[0041] FIG. 12 is a top plan view of the fourth embodiment with the upper cover of the housing removed.

[0042] FIG. 13 is a sectional view taken along A-A of FIG. 12.

[0043] FIG. 14 is an exploded schematic view of a fifth embodiment (with such components as the upper cover and the lower cover of the housing and the liquid crystal display removed).

[0044] FIG. 15 is a top plan view of the fifth embodiment with the upper cover of the housing removed.

[0045] FIG. 16 is a sectional view taken along A-A of FIG. 15.

[0046] FIG. 17 is an exploded schematic view of a sixth embodiment (with such components as the upper cover and the lower cover of the housing and the liquid crystal display removed).

[0047] FIG. 18 is a top plan view of the sixth embodiment with the upper cover of the housing removed.

[0048] FIG. 19 is a sectional view taken along A-A of FIG. 18.

[0049] FIG. 20 is an exploded schematic view of a seventh embodiment (with such components as the upper cover and the lower cover of the housing and the liquid crystal display removed).

[0050] FIG. 21 is a top plan view of the seventh embodiment with the upper cover of the housing removed.

[0051] FIG. 22 is a sectional view taken along A-A of FIG. 21.

[0052] FIG. 23 is an enlarged schematic view of a detail B shown in FIG. 22.

[0053] In the drawings, the list of components represented by reference numerals is as follows: 1, housing; 2, first-stage lever; 3, measuring contactor; 4, liquid crystal display; 5, fixing grid; 6, moving grid; 7, second-stage lever; 8, rotary center shaft; 9, stirring pin; 10, screw; 11, deep-groove ball bearing; 12, thrust ball bearing; 13, limiting shaft; 14, guiding groove; 15, wire; 16, insulating sleeve; 17, ball; 18, rotary member; 19, cover body; 20, supporting plate; and 21, fixing plate.

DETAILED DESCRIPTION OF THE INVENTION

[0054] The principles and features of the present invention are described below with reference to the accompanying drawings. Examples are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

First Embodiment

[0055] As shown in FIGS. 1-4, a lever indicator includes a housing 1, a measuring lever, a displacement sensor and a microcontroller. The displacement sensor is located inside the housing 1; the measuring lever is rotatably mounted on the housing 1; a front end of the measuring lever extends out of the housing 1 to be provided with a measuring contactor 3; and after extending to the interior of the housing, a tail end of the measuring lever synchronously swings with the displacement sensor for measurement. The microcontroller is located in the housing 1, and amends and calculates a measurement result according to a signal generated by the swinging of the displacement sensor. A liquid crystal display 4 for displaying the measurement result is further arranged outside the housing 1. The displacement sensor is any one of a capacitive grid sensor, a magnetic grid sensor or a CCD displacement sensor, and is composed of a fixing grid 5 and a moving grid 6 of a sector structure. The fixing grid 5 is fixed in the housing 1 and is correspondingly located above the tail end of the measuring lever; and the moving grid 6 is fixed onto the tail end of the measuring lever and swings relative to the fixing grid 5 after linked with the measuring lever. As the moving grid 6 performs rotary motion rather than translational motion with respect to the fixing grid 5, the moving grid 6 is designed to be of a sector structure. Thus, cells of the moving grid 6 are also designed to be sectorial.

[0056] An anti-slanting-swinging mechanism for limiting slanting swinging of the measuring lever in a rotating process is arranged at a position, corresponding to the measuring lever or a rotary center of the measuring lever, on the housing 1.

[0057] The measuring lever includes a first-stage lever 2 and a second-stage lever 7 which are arranged at a front portion and a rear portion of the housing 1 in the axial direction; a middle portion of the first-stage lever 2 is rotatably mounted at an end of the housing 1, the front end of the first-stage lever 2 extends out of the housing 1 to be connected to the measuring contactor 3, and the tail end of the first-stage lever 2 corresponds to a front portion of the second-stage lever 7; a rotary center shaft 8 enabling the second-stage lever 7 to rotate inside the housing 1 is arranged at the front portion of the second-stage lever 7; stirring pins 9 keeping rotating in the same direction after being stirred by the tail end of the first-stage lever 2 from different directions are arranged at the front portion of the second-stage lever 7 and are corresponding to the front and rear sides of the rotary center shaft 8, respectively; the moving grid 6 is fixed onto the tail end of the second-stage lever 7; and an anti-slanting-swinging mechanism configured to limit slanting swinging of the rotary center shaft 8 in a rotating process of the second-stage lever 7 is arranged on the housing 1 to limit slanting swinging of the second-stage lever 7 in the rotating process, so as to ensure a constant gap between the fixing grid 5 and the moving grid 6. Specific details are as follows.

[0058] The anti-slanting-swinging mechanism includes two limiting screws 10; a fixing plate 21 on which the top of the rotary center shaft 8 is rotatably mounted is arranged in the housing 1, and is correspondingly located above the rotary center shaft 8; the bottom of the rotary center shaft 8 is rotatably mounted at a corresponding position on the housing 1; one of the limiting screws 10 is mounted in the housing 1, is correspondingly located below the moving grid 6, and upwardly abuts against the bottom of the moving grid 6; and the other of the limiting screws 10 is located on the fixing plate 21, and downwardly abuts against an upper surface of the first-stage lever 2. In a measurement process, as the moving grid 6 is fixed on the second-stage lever 7 to form an integral body, and is abutted against by the two limiting screws 10 upwards and downwards and clamped therebetween, when the moving grid 6 is rotated relative to the fixing grid 5 for measurement, the rotation of the moving grid 6 is confined between the two limiting screws 10. Under the action of the limiting screws 10, the moving grid 6 is unlikely to swing slantly, so that a constant gap between the moving grid 6 and the fixing grid 5 is kept, thereby ensuring the measurement accuracy (after swinging, the moving grid will return under the action of a restoration member such as a torsion spring, which belongs to the prior art and will not be repeated herein). In addition, the moving grid 6 in the lever indicator is directly fixed onto the second-stage lever 7, so that a whole precision motion transmission mechanism between a lever arm and the moving grid is eliminated. Thus, on one hand, the production cost is greatly reduced; and on the other hand, as there is no intermediate motion transmission mechanism between the lever arm and the moving grid, errors caused by multi-stage transmission are reduced, greatly improving the measurement accuracy.

[0059] In an existing lever indicator, manufacturing accuracy requirements on relatively rotating components on two sides of a rotary center of a measuring lever are very high, such as micron-level tolerance accuracy; or in order to meet requirements, it is required to repeatedly adjust to avoid manufacturing or assembling errors in an assembling process. However, if the component is required to achieve the micron-level tolerance accuracy such as IT1-level or IT2-level tolerance, the manufacturing cost of the component will be greatly increased. Therefore, in order to solve the above technical problems, currently, most of the mechanical lever indicators are currently adjusted by professional technicians, which is very demanding for relevant personnel, so they need to be trained for a long time. The present invention solves the above technical problems by the following solutions.

[0060] The lever indicator further includes a wire 15 which recognizes a direction in which the first-stage lever 2 stirs the second-stage lever 7. The bottom of the stirring pin 9 close to the moving grid 6 is erected on the second-stage lever 7 through an insulating sleeve 16, one end of the wire 15 is connected to the fixing grid 5, the other end of the wire 15 is connected to the stirring pin 9 close to the moving grid 56, and the fixing grid 5, the wire 15, the stirring pin 9 close to the moving grid 56 and the first-stage lever 2 form a connected signal circuit or a disconnected signal circuit in a condition that the first-stage lever 2 stirs the second-stage lever 7 in different directions; and the microcontroller recognizes the direction in which the first-stage lever 2 stirs the second-stage lever 7 according to the connection and disconnection of the signal circuit, and amends a manufacturing or assembling error of components on two sides of the rotary center shaft 28 in the axial direction of the housing 1. Referring to FIG. 4, when the tail end of the first-stage lever 2 is rotated in a direction a (the first-stage lever 2 stirs the stirring pin 9 away from the moving grid 6), the tail end of the first-stage lever 2 is away from the stirring pin 9 close to the moving grid 56. As the insulating sleeve 16 is arranged at the bottom of the stirring pin 9, when the tail end of the first-stage lever 2 is separated from the stirring pin 9 close to the moving grid 56, a state of the signal circuit formed by the fixing grid 5, the wire 15, the stirring pin 9 close to the moving grid 56, and the first-stage lever 2 is changed from connection to disconnection. Conversely, when the tail end of the first-stage lever 2 is rotated in a direction opposite to the direction a (the first-stage lever 2 stirs the stirring pin 9 close to the moving grid 6), the tail end of the first-stage lever 2 will always cling to the stirring pin 9 close to the moving grid 56 in the whole rotating process, so that the signal circuit will remain in the connection state. The microcontroller can recognize the rotation direction of the first-stage lever 2 according to the change of the state of the signal circuit, and then amends the manufacturing or assembling error of the components on the two sides of the rotary center (rotary center shaft 8) of the second-stage lever 7, respectively, so that an accuracy error is avoided eventually. In summary, through the added wire 15, the microcontroller recognizes the swinging direction of the first-stage lever 2 to avoid the manufacturing or assembling error of the components on the two sides of the rotary center shaft, so that the requirements of manufacturing and assembling accuracy of the components are reduced while ensuring the measurement accuracy. In addition, professional technicians do not need to repeatedly adjust, greatly reducing the production and manufacturing costs.

[0061] In addition, in this field, as the sensor moving grid 56 is directly fixed on the measuring lever arm, the fixing position of the moving grid 6 determines an amplification ratio of the lever indicator in measurement, and it is difficult to ensure that the fixing positions of all moving grids 56 are completely the same in a mass production process, an amplification ratio error is generated and product accuracy is adversely affected. In the present invention, the provided microcontroller is adopted to amend a coefficient of the amplification ratio of each lever indicator, so that the accuracy of the amplification ratio of the measuring lever is ensured. Thus, in the production process, the mounting position requirement of the moving grid 56 on the measuring lever arm is not strict, so that the assembling difficulty is reduced, greatly reducing the manufacturing cost.

Second Embodiment

[0062] In this embodiment, the anti-slanting-swinging mechanism is changed, and other structures are the same as those in the first embodiment. As shown in FIGS. 5-7, the anti-slanting-swinging mechanism includes two deep-groove ball bearings 11 for limiting slanting swinging of the rotary center shaft 8 in the horizontal direction and in the vertical direction; and the two deep-groove ball bearings 11 are located in the housing 1, are corresponding to an upper position and a lower position of the rotary center shaft 8, and sleeve the upper portion and the lower portion of the rotary center shaft 8, respectively. Due to its structural characteristics, an inner ring of the deep-groove ball bearing 11 is fixed in the radial direction, namely, in the horizontal direction, and can slide vertically (namely, slides to the top and bottom dead points) in the axial direction, namely, in the vertical direction. Therefore, the first deep-groove ball bearing 11 sleeves the rotary center shaft 8 to limit the slanting swinging of the rotary center shaft 8 in the horizontal direction. When the second deep-groove ball bearing 11 is mounted, regardless of whether the second deep-groove ball bearing 11 is located above or below the first deep-groove ball bearing 11, all that is needed is to ensure that the inner ring of the second deep-groove ball bearing 11 and the inner ring of the first deep-groove ball bearing 11 are staggered. For example, if the inner ring of the first deep-groove ball bearing 11 is located at the top dead point, the inner ring of the second deep-groove ball bearing 11 is located at the bottom dead point. The inner rings of the two deep-groove ball bearings cannot slide vertically in the vertical direction under the interaction of the inner rings, so that the slanting swinging of the rotary center shaft 8 in the horizontal direction and in the vertical direction is limited. As long as the rotary center shaft 8 does not swing slantingly, the constant gap between the moving grid 6 and the fixing grid 5 can be kept during the rotation of the moving grid 6, so that the measurement accuracy is ensured eventually.

Third Embodiment

[0063] In this embodiment, the anti-slanting-swinging mechanism is changed, and other structures are the same as those in the first embodiment. As shown in FIGS. 8-10, the anti-slanting-swinging mechanism includes two thrust ball bearings 12 for limiting slanting swinging of the rotary center shaft 8 in the horizontal direction and in the vertical direction; and the two thrust ball bearings 12 are located in the housing 1, are corresponding to an upper position and a lower position of the rotary center shaft 8, and sleeve the upper portion and the lower portion of the rotary center shaft 8, respectively. Due to its structural characteristics, an inner ring of the thrust ball bearing 12 is fixed in the axial direction, namely, in the vertical direction, and can slide transversely (namely, slides to the left and right dead points) in the radial direction, namely, in the horizontal direction. Therefore, the first thrust ball bearing 12 sleeves the rotary center shaft 8 to limit the slanting swinging of the rotary center shaft 8 in the vertical direction. When the second thrust ball bearing 12 is mounted, regardless of whether the second thrust ball bearing 12 is located above or below the first thrust ball bearing 12, all that is needed is to ensure that the inner ring of the second thrust ball bearing 12 and the inner ring of the first thrust ball bearing 12 are staggered. For example, if the inner ring of the first thrust ball bearing 12 is located at the left dead point, the inner ring of the second thrust ball bearing 12 is located at the right dead point. The inner rings of the two deep-groove ball bearings cannot slide transversely in the horizontal direction under the interaction of the inner rings, so that the slanting swinging of the rotary center shaft 8 in the horizontal direction and in the vertical direction is limited. As long as the rotary center shaft 8 does not swing slantingly, the constant gap between the moving grid 6 and the fixing grid 5 can be kept during the rotation of the moving grid 6, so that the measurement accuracy is ensured eventually.

Fourth Embodiment

[0064] In this embodiment, the anti-slanting-swinging mechanism is changed, and other structures are the same as those in the first embodiment 1. As shown in FIGS. 11-13, the anti-slanting-swinging mechanism includes two limiting shafts 13 for limiting slanting swinging of the rotary center shaft 8 in the horizontal direction and in the vertical direction; a fixing plate 21 on which the top of the rotary center shaft 8 is rotatably mounted is arranged in the housing 1, and is correspondingly located above the rotary center shaft 8; the bottom of the rotary center shaft 8 is rotatably mounted at a corresponding position on the housing 1; and the two limiting shafts 13 are parallelly arranged in the housing 1 and are corresponding to an upper position and a lower position of the middle portion of the second-stage lever 7. The second-stage lever 7 is located between the two limiting shafts 13, and a distance between the limiting shafts 13 is matched with the second-stage lever 7, so that the second-stage lever 7 can only be rotated between the two limiting shafts 13, limiting the slanting swinging of the second-stage lever 7. As the second-stage lever 7 and the moving grid 6 have the same rotary center (the rotary center shaft 8), the second-stage lever 7 and the moving grid 6 have no relative motion during the measurement. On the premise that the second-stage lever 7 does not slanting swing, it is possible to keep the constant gap between the moving grid 6 and the fixing grid 5 during the rotation of the moving grid 6, so that the measurement accuracy is ensured eventually.

Fifth Embodiment

[0065] In this embodiment, the anti-slanting-swinging mechanism is changed, and other structures are the same as those in the first Embodiment. As shown in FIGS. 14-16, the anti-slanting-swinging mechanism is a guiding groove 14 matching the tail end of the second-stage lever 7; a fixing plate 21 on which the top of the rotary center shaft 8 is rotatably mounted is arranged in the housing 1, and is correspondingly located above the rotary center shaft 8; the bottom of the rotary center shaft 8 is rotatably mounted at a corresponding position on the housing 1; and the guiding groove 14 is located at a position corresponding to the tail end of the second-stage lever 7 in the housing 1, and the tail end of the second-stage lever 7 reaches the interior of the guiding groove 14 after extending outside the bottom of the moving grid 6. A cavity of the guiding groove 14 is matched with the moving grid 6. The tail end of the moving grid 6 is located in the cavity of the guiding groove 14 and swings under the guiding of the guiding groove 14, the constant gap between the moving grid 6 and the fixing grid 5 during the rotation of the moving grid 6 can be kept, so that the measurement accuracy is ensured eventually.

Sixth Embodiment

[0066] As shown in FIGS. 17-19, the measuring lever is a first-stage measuring lever 2, and the moving grid 6 is fixed onto the tail end of the first-stage measuring lever 2; the anti-slanting-swinging mechanism includes two limiting screws 10; a fixing plate 21 on which the top of the rotary center shaft 8 is rotatably mounted is arranged in the housing 1, and is correspondingly located above the rotary center shaft 8; the bottom of the rotary center shaft 8 is rotatably mounted at a corresponding position on the housing 1; one of the limiting screws 10 is mounted in the housing 1, is correspondingly located below the moving grid 6, and upwardly abuts against the bottom of the moving grid 6; and the other of the limiting screws 10 is located on the fixing plate 21, and downwardly abuts against the upper surface of the first-stage measuring lever 2. The anti-slanting-swinging principle of this embodiment is the same as that of the first embodiment. This embodiment can ensure the constant gap between the moving grid 6 and the fixing grid 5 during the rotation, so that the measurement accuracy is improved. In addition, in this embodiment, the moving grid 6 is fixed onto the tail end of the first-stage measuring lever 2, so that the second-stage lever is eliminated, enabling the entire mechanical structure to be simpler. After the second-stage lever is eliminated, the measuring contactor 3 and the moving grid 6 swing in opposite directions, and the zero position of the lever indicator is located at the middle, rather than one side in the first to fifth embodiments. Therefore, when it is required to reach the same range under the same condition, all that is needed is to slightly enlarge the size of the lever indicator in this embodiment. As there is only the first-stage transmission, the measurement accuracy is greatly improved. In addition, the lever indicator of the first-stage lever structure can adopt the anti-slanting-swinging mechanism of any of the above second to fifth embodiments according to actual needs to ensure the constant gap between the moving grid 6 and the fixing grid 5 during the rotation, so as to improve the measurement accuracy.

[0067] As described above, the present invention reduces the manufacturing and assembling accuracy requirements of the components by providing the wire 15. The specific details are as follows.

[0068] A supporting plate 20 is rotatably arranged in the housing 1 through a rotating shaft 22, and is correspondingly located below the rear portion of the first-stage lever 2. A fixing plate 21 on which the top of the rotating shaft 22 is rotatably mounted is arranged in the housing 1, and is correspondingly located above the rotating shaft 22. The bottom of the rotating shaft 22 is rotatably mounted at a corresponding position on the housing 1. Stirring pins 9 stirred by the first-stage lever 2 from different directions are upwardly erected on the supporting plate 20, and are corresponding to two sides in the axial direction of a rotating center of the supporting plate 20. The bottom of the stirring pin 9 close to the moving grid 6 is erected on the supporting plate 20 through an insulating sleeve 16. One end of the wire 15 is connected to the fixing grid 5, and the other end of the wire 15 is connected to the stirring pin 9 close to the moving grid 6. The fixing grid 5, the wire 15, the stirring pin 9 close to the moving grid and the first-stage lever 2 can form a connected signal circuit or a disconnected signal circuit when the first-stage lever 2 stirs the supporting plate 20 in different directions. The microcontroller recognizes the swinging direction of the first-stage lever 2 according to the connection and disconnection of the signal circuit, and amends a manufacturing or assembling error of components on two sides of a rotary center of the first-stage lever 2 in the axial direction of the housing 1.

[0069] Referring to FIG. 18, when the tail end of the first-stage lever 2, namely, the moving grid 6, is rotated in a direction b, the position (the middle) corresponding to the stirring pin 9 away from the moving grid 6 is also rotated in the direction b, and the middle of the first-stage lever 2 will be away from the stirring pin 9 close to the moving grid 56. As the insulating sleeve 16 is arranged at the bottom of the stirring pin 9, when the middle of the first-stage lever 2 is separated from the stirring pin 9 close to the moving grid 56, a state of the signal circuit formed by the fixing grid 5, the wire 15, the stirring pin 9 close to the moving grid 56, and the first-stage lever 2 is changed from connection to disconnection. Conversely, when the tail end of the first-stage lever 2 is rotated in the direction opposite to the direction b, the middle of the first-stage lever 2 will always cling to the stirring pin 9 close to the moving grid 56 in the whole rotating process, so that the signal circuit will remain in the connection state (the supporting plate is rotated synchronously and is restored after rotation). The microcontroller can recognize the rotation direction of the first-stage lever 2 according to the change of the state of the signal circuit, and then amends the manufacturing or assembling error of the components on the two sides of the rotary center of the first-stage lever 2, respectively, so that an accuracy error is avoided eventually.

Seventh Embodiment

[0070] In this embodiment, the anti-slanting-swinging mechanism is changed, and other structures are the same as those in the sixth embodiment. As shown in FIGS. 20-23, the anti-slanting-swinging mechanism includes balls 17 and a rotary member 18 located in the middle of the end of the housing 1. Tapered grooves matched with the balls 17 are formed at the top and the bottom of the rotary member 18, respectively. There are two balls 17 which are respectively located in the tapered grooves. The middle of the first-stage lever 2 is connected to the rotary member 18. A cover body 19 for pressing the ball 17 into the corresponding tapered groove for limiting the slanting swinging of the rotary member 18 is threadedly mounted at each end of the housing 1 corresponding to the ball 17. In addition, the tapered grooves matched with the balls 17 are formed in the cover bodies 19 and are corresponding to the balls 17. The positions of the balls 17 in the tapered grooves can be adjusted by rotating the upper and lower cover bodies 19, so that the two sides of each of the top and bottom of the ball 17 are tangent to the inner wall of the corresponding tapered groove, ensuring that the ball 17 can only rotate in the tapered groove in its axial direction without slanting swinging. Meanwhile, the balls 17 can rotate with the minimum frictional force, thereby ensuring the constant gap between the moving grid 6 and the fixing grid 5 during the rotation of the moving grid 6.

[0071] The foregoing descriptions are only preferred embodiments of the present invention, and do not intend to limit the present invention. Any variation, equivalent substitution and modification that fall within the spirit and principle of the present invention should be embraced by the protective scope of the present invention.