ROTOR FOR AN IMPACT CRUSHER

Abstract

A rotor of an impact crusher may include a crushing roll body and at least one holding device that is mounted on the crushing roll body and is configured to hold a blow bar. The holding device may have a guide frame and at least one guide element. The guide element may be connected to the blow bar and may be movably mounted on the guide frame such that movement of the guide element relative to the guide frame in a radial direction results in movement of the blow bar relative to the crushing roll body in the radial direction. The guide element can be arranged so as to be movable in an axial direction relative to the blow bar.

Claims

1.-17. (canceled)

18. A rotor of an impact crusher comprising: a crushing roll body; and a holding device that is mounted on the crushing roll body, wherein the holding device is for holding a blow bar and comprises a guide frame, and a guide element that is connected to the blow bar and is movably mounted on the guide frame such that movement of the guide element relative to the guide frame in a radial direction results in movement of the blow bar relative to the crushing roll body in the radial direction, wherein the guide element is movable in an axial direction relative to the blow bar.

19. The rotor of claim 18 wherein the crushing roll body has a recess in which the holding device is received and detachably connected to the crushing roll body.

20. The rotor of claim 18 wherein the guide element is substantially wedge-shaped.

21. The rotor of claim 18 wherein the holding device includes a first threaded spindle by way of which the guide element is mounted on the guide frame.

22. The rotor of claim 18 wherein the holding device has a clamping element that is mounted movably in the guide frame such that movement of the clamping element in the radial direction results in movement of the guide element in the radial direction.

23. The rotor of claim 22 wherein the clamping element is mounted movably in the guide frame such that the clamping element is movable into a blocking position in which the clamping element prevents movement of the guide element in the radial direction.

24. The rotor of claim 23 wherein the clamping element is movable parallel to a direction of movement of the guide element.

25. The rotor of claim 23 wherein the clamping element is substantially wedge-shaped.

26. The rotor of claim 23 wherein the holding device includes a first threaded spindle by way of which the guide element is mounted on the guide frame, wherein the clamping element is mounted on the guide frame by way of a second threaded spindle.

27. The rotor of claim 26 wherein the first threaded spindle and the second threaded spindle are mounted in the guide frame such that the first and second threaded spindles are movable in the radial direction.

28. The rotor of claim 26 wherein the guide element is a first guide element and the clamping element is a first clamping element, wherein the first guide element and a second guide element are mounted on the first threaded spindle, wherein the first clamping element and a second clamping element are mounted on the second threaded spindle.

29. The rotor of claim 26 wherein at least one of the first threaded spindle or the second threaded spindle includes a first region with a right-hand thread and a second region with a left-hand thread.

30. The rotor of claim 29 further comprising a spring element disposed between the first region and the second region.

31. The rotor of claim 18 wherein the guide element includes a projection.

32. The rotor of claim 31 wherein the blow bar includes a groove that extends in the axial direction and engages with the projection of the guide element.

33. The rotor of claim 18 wherein the guide frame includes a guide surface for guiding a guide element.

34. The rotor of claim 18 wherein the guide frame includes a guide surface for guiding a clamping element.

35. The rotor of claim 18 wherein the guide element includes a trapezoidal projection, wherein the blow bar includes a trapezoidal groove that extends in the axial direction and engages with the trapezoidal projection of the guide element.

Description

DESCRIPTION OF THE DRAWINGS

[0028] The invention is explained in greater detail below by means of a number of illustrative embodiments with reference to the attached figures.

[0029] FIG. 1 shows a perspective view of a rotor of an impact crusher having a plurality of blow bars according to one illustrative embodiment.

[0030] FIG. 2 shows a perspective view of a holding device having a blow bar according to one illustrative embodiment.

[0031] FIG. 3 shows a perspective view of a guide frame according to the illustrative embodiment from FIG. 2.

[0032] FIG. 4 shows a guide element in a perspective view and a front view according to the illustrative embodiment from FIG. 2.

[0033] FIG. 5 shows a perspective view of a clamping element according to the illustrative embodiment from FIG. 2.

[0034] FIG. 6 shows a perspective view of a blow bar according to the illustrative embodiment from FIGS. 1 and 2.

[0035] FIG. 7 shows a perspective view of a driving device according to another illustrative embodiment.

[0036] FIG. 1 shows a rotor 10 of an impact crusher for breaking down limestone, marl, clay, rubble or similar mineral materials. The rotor 10 comprises a substantially cylindrical crushing roll body 12 having a central axial hole 14 to receive a shaft (not shown) for driving the crushing roll body. During the operation of the impact crusher, the rotor 10 rotates in the direction of the arrow, wherein the blow bars 18 interact, for example, with another rotor (not shown in FIG. 1) rotating in the opposite direction or with impact elements (not shown) arranged to the side of the rotor 10.

[0037] On its outer circumference, the crushing roll body 12 has six recesses 16, which extend in the axial direction and in each of which a blow bar 18 and a holding device 20 are arranged. The substantially plate-shaped blow bars 18 extend in the axial direction over the entire length of the crushing roll body 12, with the result that they each end at the side faces of the crushing roll body 12. In the radial direction, the blow bars 18 each extend over about a third of their height beyond the outer circumference of the crushing roll bodies 12 and extend with about two thirds of their height into the crushing roll bodies 12. The blow bars 18 are spaced apart uniformly over the circumference of the crushing roll bodies 12. Each blow bar 18 rests against the holding device 20 by means of the side face facing in the direction of rotation and against the crushing roll body 12 by means of the opposite side face. Furthermore, fastening means 22, which prevent movement of the blow bars 18 in the axial direction, are mounted on the crushing roll body 12. The fastening means 22 are preferably plates mounted on the side face of the crushing roll bodies 12, which are, for example, screwed to the crushing roll body and interact with the blow bar, ensuring that the blow bar 18 is fixed in the axial direction. The holding device 20 extends in the radial direction along the side face of the respective blow bar 18 which extends within the crushing roll body 12, and the holding device ends flush with the circumference of the crushing roll bodies 12. In the axial direction, the holding device 20 extends axially in the recess 16 over the entire length of the crushing roll body 12. The holding device 20 is mounted detachably on, e.g. screwed to, the crushing roll body 12, thus enabling the holding device to be replaced when required.

[0038] FIG. 2 shows a detailed illustration of the holding device 20 from FIG. 1, wherein the blow bar 18 is shown partially in section for the sake of simplicity. The holding device 20 has a guide frame 24, which is of substantially box-shaped design and has a plurality of guide surfaces. The design of the guide frame 24 is described in detail with reference to FIG. 3. Two guide elements 26 and two clamping elements 28 are furthermore arranged in the guide frame 24, wherein only one guide element 26 and one clamping element 28 are shown in FIG. 2, each being movable along the guide surfaces 44, 46, 48, 50 illustrated in FIG. 3. The holding device furthermore comprises a driving device 36, which has a first threaded spindle 30 and a second threaded spindle 32. The threaded spindles 30, 32 extend parallel to one another through the guide frame 24 in the longitudinal direction of the guide frame 24. Two guide elements 26 are arranged on the first threaded spindle 30, which is arranged above the second threaded spindle 32, in particular radially to the outside of the second threaded spindle 32, wherein two clamping elements 28 are arranged on the second threaded spindle 32. The threaded spindles 30, 32 are each mounted by means of fastening elements 38, 40, in particular nuts, in a slotted hole 42 extending through the guide frame 24, thus preventing axial movement of the threaded spindles 30, 32 and allowing radial movement of the threaded spindles 30, 32. The threaded spindles 30, 32 each have threads, in particular two threads, a right-hand thread and a left-hand thread, wherein these each extend as far as the center of the threaded spindle, with the result that one of the ends of the threaded spindles 30, 32 has a right-hand thread and the other end of the threaded spindles 30, 32 has a left-hand thread. The guide elements 26 are arranged at respective opposite ends of threaded spindle 30 and are at the same distance from the respective end of the threaded spindle, with the result that, when threaded spindle 30 is rotated, the guide elements 26 move in opposite directions on threaded spindle 30. The clamping elements 28 are mounted on the second threaded spindle 32 in the same way, with the result that they likewise move in opposite directions.

[0039] The guide frame 24 illustrated in FIG. 3 has a rear wall 52, which rests against the crushing roll body 12 in the state of the guide frame 24 in which it is installed in the crushing roll body 12. Four guide surfaces 44, 46, 48, 50 are formed in the guide frame 24, and the guide elements 26 and the clamping elements 28 are guided along said surfaces. Guide surfaces 48 and 50 each serve to guide a clamping element 26 and are arranged in a V shape relative to one another and at right angles to the rear wall 52. Guide surfaces 48 and 50 are of flat design and each extend from the center of the longitudinal side of the guide frame 24 at a slope angle of about 5-30, in particular 10-20, preferably 10.5, to the axial direction of the rotor 10 toward the side faces of the guide frame 24. Guide surfaces 44 and 46 each serve to guide a guide element 26 and are arranged substantially in a V shape relative to one another, wherein guide surfaces 44 and 46 are arranged at an angle of about 10-30, in particular 12-20, preferably 14, to the rear wall 52 of the guide frame. The slope angle of guide surfaces 44 and 46 relative to the axial direction is about 5-30, in particular 10-20, preferably 10.5, and corresponds to the slope of guide surfaces 48 and 50, wherein guide surfaces 44 and 46 for guiding a respective guide element 26 are arranged above guide surfaces 48 and 50, in particular radially to the outside thereof.

[0040] The guide frame 24 furthermore has a slotted hole 42 elongated in the radial direction, which extends in the longitudinal direction of the guide frame 24, in particular in the axial direction of the crushing roll body 12, through the guide frame 24 and through which the first and second threaded spindles 30, 32 illustrated in FIG. 2 extend. The slotted hole 42 furthermore extends through guide surfaces 48 and 50.

[0041] A guide element 26 illustrated in FIG. 4 has a substantially wedge-shaped form, wherein the upward-, radially outward-facing surface forms an angle of about 5-30, in particular 10-20, preferably 10.5 to the longitudinal axis of the guide element 26, in particular to the axial direction of the rotor 10. The side of the guide element 26 which faces in the direction of the holding device 20 has a side face which extends substantially in the radial direction and a contact surface 62 which rests against guide surface 44 of FIG. 3 and is designed to match the angular orientation of guide surface 44. The contact surface 26 forms an angle of about 10-30, in particular 12-20, preferably 14, to the side face and to the radial direction of the rotor 20. The surface of the guide element 26 which faces the blow bar 18 has a trapezoidal projection 64, which extends along the lower, radially inward edge of the guide element 26. The trapezoidal projection 64 serves to connect the guide element 26 positively to the blow bar 18. A threaded hole 54 for accommodating the first threaded spindle 30 extends in the longitudinal direction through the guide element 26. A guide element 26 resting against guide surface 46 has a symmetrical construction with respect to the guide element 26 illustrated in FIG. 4.

[0042] The clamping element 28 illustrated in FIG. 5 is of substantially wedge-shaped design, wherein the downward-, radially inward-facing surface forms a contact surface 56, which rests against guide surface 48 of the guide frame 24 and is designed to match the angular orientation of guide surface 48. The contact surface 56 is substantially flat and has an angle of about 5-30, in particular 10-20, preferably 10.5, to the axial direction. A threaded hole 58 for accommodating the second threaded spindle 32 extends in the longitudinal direction through the clamping element 28. When installed in the guide frame 24, the upper, radially outward-facing surface of the clamping element 28 rests against the lower, radially inward-facing surface of the guide element 26. A clamping element resting against guide surface 50 has a symmetrical construction with respect to the clamping element 28 illustrated in FIG. 4.

[0043] FIG. 6 shows a blow bar 18 which has a trapezoidal groove 34 in the side face which faces the holding device in the installed state. The groove 34 extends in the longitudinal direction of the blow bar 18 along the lower, radially inward-facing edge and is used to connect the blow bar 18 to the guide elements 26. In the installed state illustrated in FIG. 2, the trapezoidal groove 34 of the blow bar 18 interacts with the trapezoidal projection 34 of the guide elements 26, thus allowing the guide elements 26 to be moved relative to the blow bar 18 along the groove 34. The blow bar 18 furthermore has an impact surface 60, which is arranged on the radially outward end region of the side face and, for example, has a wear-resistant coating (not shown here).

[0044] FIG. 7 shows a segment of a driving device 36, wherein only one threaded spindle 30 is illustrated by way of example. The threaded spindle 30 has a first section 66 and a second section 68, which have different threads. For example, the first section 66 has a right-hand thread and the second section 68 has a left-hand thread. Arranged between the first section 66 and the second section 68 is a spring element 70, which has a sleeve, in which a spring, e.g. a helical compression spring or a plurality of diaphragm springs, is arranged. The sleeve is connected to the first section 66 and the second section 68 of the threaded spindle in such a way that axial movement of the sections 66, 68 is possible but twisting of the sections 66, 68 relative to one another is prevented. The ends of the sections 66, 68 which face toward the center of the threaded spindle 30 preferably have an external hexagon, which interacts with an internal hexagon formed in the sleeve and thus prevents twisting of the sections 66, 68 relative to one another and allows movement of the sections relative to one another in the axial direction. The spring element ensures preloading between the sections 66 and 68, for example, and thus prevents incorrect tightening of the threaded spindle.

[0045] To move the blow bar in the radial direction, the first threaded spindle 30 is rotated, with the result that the guide elements 26 move outward along threaded spindle 30 in the axial direction. The different threads of the threaded spindle ensure that the guide elements 26 move in opposite directions to one another. The connection between the blow bar 18 and the guide elements 26 by means of a positive connection, which comprises a trapezoidal projection on the guide elements 26 in the trapezoidal groove 34 of the blow bar, enables the guide elements 26 to slide along the groove 34 in the axial direction, with the result that the blow bar 18 moves in the radial direction with the guide elements 26 but not in the axial direction. For radial movement of the blow bar 18, the second threaded spindle 32 is rotated, with the result that the clamping elements 28 each slide under a guide element 26 and move the latter against the guide surfaces 44, 46, 48, 50. The clamping elements in each case move the guide elements in the radial direction into a blocking position, in which the guide elements rest against the guide surfaces 44, 46 and an outward movement in the radial direction is prevented. In the blocking position, the clamping elements are each arranged radially on the inside relative to a guide element, with the result that an inward movement of the guide element 26 in the radial direction is prevented. The threaded spindles 30, 32 are driven manually, for example, or by means of an external driving device, such as a hydraulic motor or an electric motor.

[0046] The arrangement described provides simple and reliable adjustment of the blow bars in the radial direction, and therefore replacement of the overall blow bar 18 is necessary only when there is very severe wear, and the height of the blow bar 18 can be adapted at any time to the properties of the respective materials to be broken down. In particular, the arrangement allows continuous, stepless movement of the blow bar in the radial direction, as a result of which precise positioning of the blow bar is possible. This allows a considerable time-saving in the case of wear of the blow bars and prevents long downtimes of the impact crusher.

LIST OF REFERENCE NUMERALS

[0047] 10 Rotor [0048] 12 Crushing roll body [0049] 14 Hole [0050] 16 Recess [0051] 18 Blow bar [0052] 20 Holding device [0053] 22 Fastening means [0054] 24 Guide frame [0055] 26 Guide element [0056] 28 Clamping element [0057] 30 First threaded spindle [0058] 32 Second threaded spindle [0059] 34 Trapezoidal groove [0060] 36 Driving device [0061] 38 Fastening means [0062] 40 Fastening means [0063] 42 Recess [0064] 44 Guide surface [0065] 46 Guide surface [0066] 48 Guide surface [0067] 50 Guide surface [0068] 52 Rear wall [0069] 54 Threaded hole [0070] 56 Guide surface [0071] 58 Threaded hole [0072] 60 Impact surface [0073] 62 Contact surface [0074] 64 Trapezoidal projection [0075] 66 First section of the threaded spindle [0076] 68 First section of the threaded spindle [0077] 70 Spring element