Thickness detection device for disc type friction plate

Abstract

The invention relates to the technical field of detection equipment, and provides a thickness detection device for disc friction plates, which comprises a machine table and a rack fixed on the machine table, a rotating mechanism is arranged on the machine table, and a plurality of annularly distributed disc friction plates are placed above the rotating mechanism. A plurality of clamps used for fixing disc type friction plates are arranged on the top of the rotating mechanism, and a first motor is fixed to the lower portion of the machine table. Under the driving of the driving mechanism, intermittent rotation of the rotating mechanism can be realized, when the placing disc is in a rotation switching angle, the detection probe is just in a neutral position and is kept at a fixed position on one side of the disc type friction plate, and when the placing disc is in an intermittent time period when rotation stops, the detection probe is just in a neutral position and is kept at a fixed position on one side of the disc type friction plate. Compared with the prior art, the detection probe just can carry out flat-scanning detection on the disc friction plate below and automatically reset, and compared with the prior art, the flat-scanning detection mode matched with the radian of the friction plate is adopted, so that the coverage range can be increased, and the detection capacity is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and more specifically, to a thickness detection device for disc brake pads. Background Art

[0002] The disc brake pad is an important component of the disc brake system. It is usually used in conjunction with the brake disc to achieve vehicle braking through friction. The thickness of the disc brake pad is an important indicator to measure the service life and braking performance of the brake pad. Through detection, it can be ensured that the thickness of the brake pad meets the design requirements, thus guaranteeing the reliability of the vehicle braking system. Thickness detection is an important link in quality control, which helps to discover defects in the production process and ensure the consistency and stability of products.

[0003] After retrieval, the publication number CN217304622U discloses an automatic detection device for disc brake pads, including a fixing plate. On both sides of the upper end of the fixing plate, fixing columns are fixedly arranged in the middle. At the upper ends of the two fixing columns, a support plate is fixedly arranged. In the middle of the lower end of the support plate, a connecting seat is fixedly arranged. At the lower end of the connecting seat, a hydraulic cylinder is fixedly arranged. On the upper end of the fixing plate, a sliding seat is fixedly arranged. Inside the front and rear ends of the sliding seat, sliding grooves are fixedly arranged. On the sliding seat, two sliding frames are slidably arranged. On the upper ends of the two sliding frames, fixing frames are fixedly arranged. This device drives the clamping plate to rise and fall through an adjusting bolt to clamp the brake pad, enabling the device to clamp brake pads of different thicknesses. At the same time, the thickness of the brake pad can be observed through a scale line to achieve the detection of the brake pad thickness. However, this detection method can only detect the fixed positions at both ends of the brake pad, with a small detection range and large limitations, thus affecting the detection accuracy. Moreover, only a single brake pad can be detected at a time, and the detection efficiency is very low, affecting the use. Summary of the Invention

[0004] The present invention provides a thickness detection device for disc brake pads, which solves the problems of small detection range and low detection efficiency in the prior art.

[0005] The technical solution of the present invention is as follows: A thickness detection device for disc brake pads includes a machine table and a frame fixed on the machine table. A rotating mechanism is arranged on the machine table. Above the rotating mechanism, a number of annularly distributed disc brake pads are placed. On the top of the rotating mechanism, a number of clamps for fixing the disc brake pads are arranged. A first motor is fixed below the machine table. On the machine table, a driving mechanism is arranged to drive the rotating mechanism to rotate intermittently under the drive of the first motor. On the top surface of the frame, a cylinder is fixed. Below the frame, a detection mechanism that moves up and down under the drive of the cylinder and a sweeping mechanism that drives the detection mechanism to perform a flat sweep detection on the disc brake pads below during the rotation interval of the rotating mechanism under the synchronous drive of the driving mechanism are arranged.

[0006] Preferably, the rotation mechanism includes a placement disk. A first rotating shaft is fixed at the center position of the placement disk. The first rotating shaft is rotatably connected to the machine table. A grooved pulley is fixed to the bottom surface of the placement disk. A plurality of first arc grooves corresponding to the clamps are provided along the edge of the grooved pulley, and a plurality of notches alternately arranged with the first arc grooves are provided.

[0007] Preferably, the driving mechanism includes a runner. A second rotating shaft is fixed at the center position of the runner. The second rotating shaft is rotatably connected to the machine table. A second arc groove adapted to the circumferential surface of the grooved pulley is provided along the edge of the runner. A bottom plate is fixed to the bottom of the second arc groove. A first shift lever capable of turning into the notch is fixed to the bottom plate.

[0008] Preferably, the detection mechanism includes a top disk. A fourth rotating shaft is fixed at the center position of the top disk. A bushing is rotatably connected to the outer side of the top of the fourth rotating shaft, and a torsion spring is clamped at the connection between the fourth rotating shaft and the bushing. The bushing is fixed to the output end of the air cylinder. A first sliding groove and a second sliding groove are radially formed in the top disk. A measurement and control unit capable of adjusting the detection radius according to the rotation period of the driving mechanism is arranged in the first sliding groove, and an adjusting member capable of performing sweeping detection according to the radian of the disk friction plate for adaptive adjustment is arranged in the second sliding groove.

[0009] Preferably, the measurement and control unit includes an encoder, a controller and a detection probe. A slider is fixed to the top of the detection probe. The slider is slidably connected in the first sliding groove. A second motor is fixed to one end of the first sliding groove. A threaded rod threadedly connected to the slider is fixed to the output end of the second motor. The encoder is used to detect the rotation period of the driving mechanism and feedback it to the controller after the driving mechanism reaches the set period, and the second motor drives the detection probe to increase the detection radius under the control of the controller.

[0010] Preferably, the adjusting member includes a fixing piece capable of sliding in the second sliding groove. The fixing piece is fixed to the top disk by bolts. A second shift lever is fixed to the bottom of the fixing piece.

[0011] Preferably, the flat sweeping mechanism includes a turntable. A third rotating shaft is fixed to the bottom of the turntable. The third rotating shaft is rotatably connected to the frame. A first sprocket is fixed to the outer side of the third rotating shaft. A second sprocket is fixed to the top end of the second rotating shaft. The first sprocket and the second sprocket are connected by a chain drive. A blocking portion protruding in a conch shape is provided along the edge of the turntable.

[0012] Preferably, the third rotating shaft and the first rotating shaft are concentrically arranged, the third rotating shaft and the fourth rotating shaft are eccentrically arranged, and the fourth rotating shaft and the axis of the disk friction plate are concentrically arranged.

[0013] The beneficial effects of the present invention are: In the present invention, under the drive of the drive mechanism, the intermittent rotation of the rotating mechanism can be realized. When the placement disk is at the rotation switching angle, the detection probe just stays in the fixed position on one side of the disk friction plate during the idle period. When the placement disk is at the intermittent period of rotation stop, the detection probe can just perform a flat sweep detection on the lower disk friction plate and automatically reset. Compared with the prior art, the flat sweep detection method matching the arc of the friction plate adopted in the present invention can increase the coverage range and improve the detection ability; When the drive mechanism drives the placement disk to rotate in the present invention, the encoder can detect the rotation period of the drive mechanism and feedback it to the controller after the drive mechanism reaches the set period. Then, the controller controls the operation of the second motor to increase the detection radius of the detection probe. Through the periodic rotation process of the placement disk, the comprehensive detection of the surface position of the disk friction plate from the inner arc to the outer arc is realized, and then the thickness of different positions of each disk friction plate can be accurately measured. Compared with the prior art, the present invention can realize the comprehensive detection of the disk friction plate and can detect multiple friction plates at one time, improving the detection efficiency; In the present invention, the position of the second lever is adjusted by sliding the fixing piece in the second chute, so as to adjust the initial distance from the third rotating shaft. The smaller the initial distance between the second lever and the third rotating shaft, the larger the sweeping range of the detection probe. On the contrary, the larger the initial distance between the second lever and the third rotating shaft, the smaller the sweeping range of the detection probe, so as to adapt to the detection of disk friction plates with different arcs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0015] Figure 1 It is a schematic diagram of the overall structure of a thickness detection device for a disk friction plate proposed by the present invention; Figure 2 It is a front view structural schematic diagram of the overall thickness detection device for a disk friction plate proposed by the present invention; Figure 3 It is a structural schematic diagram of the rotating mechanism proposed by the present invention; Figure 4 It is a structural schematic diagram of the rotating mechanism from another perspective proposed by the present invention; Figure 5 It is a structural schematic diagram of the drive mechanism proposed by the present invention; Figure 6 It is a structural schematic diagram of the flat sweep mechanism proposed by the present invention; Figure 7 It is a structural schematic diagram of the detection mechanism proposed by the present invention; Figure 8 It is a structural schematic diagram of the detection mechanism from another perspective proposed by the present invention; Figure 9 Schematic diagram of the detection probe of the present invention in the idle period; Figure 10 Schematic diagram of the detection probe of the present invention in the horizontal scan; Figure 11 Schematic diagram of the detection probe of the present invention in the reset state; In the figure: 1, machine table; 2, rotating mechanism; 21, placing plate; 22, first rotating shaft; 23, grooved wheel; 24, first arc groove; 25, notch; 3, first motor; 4, driving mechanism; 41, runner; 42, second rotating shaft; 43, second arc groove; 44, bottom plate; 45, first lever; 5, frame; 6, cylinder; 7, detection mechanism; 71, top plate; 72, fourth rotating shaft; 73, bushing; 74, first chute; 75, second chute; 76, second motor; 77, threaded rod; 78, slider; 79, detection probe; 710, fixing piece; 711, second lever; 8, fixture; 9, disc friction plate; 10, horizontal scan mechanism; 101, turntable; 102, third rotating shaft; 103, first sprocket; 104, second sprocket; 105, chain; 106, blocking part. Detailed implementation manners

[0016] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0017] Please refer to Figure 1 And Figure 2 The present invention provides a technical solution: a thickness detection device for a disc friction plate, including a machine table 1 and a frame 5 fixed on the machine table 1. A rotating mechanism 2 is arranged on the machine table 1. A plurality of annularly distributed disc friction plates 9 are placed above the rotating mechanism 2. A plurality of fixtures 8 for fixing the disc friction plates 9 are arranged on the top of the rotating mechanism 2. A first motor 3 is fixed below the machine table 1. A driving mechanism 4 is arranged on the machine table 1 to drive the rotating mechanism 2 to rotate intermittently under the drive of the first motor 3. A cylinder 6 is fixed on the top surface of the frame 5. A detection mechanism 7 that moves up and down under the drive of the cylinder 6 and a horizontal scan mechanism 10 that drives the detection mechanism 7 to horizontally scan and detect the disc friction plate 9 below during the rotation interval of the rotating mechanism 2 are arranged below the frame 5 under the synchronous drive of the driving mechanism 4.

[0018] Please refer to Figure 3 And Figure 4The rotating mechanism 2 includes a placement plate 21, a first rotating shaft 22 is fixed at the center position of the placement plate 21, the first rotating shaft 22 is rotatably connected to the machine table 1, a groove wheel 23 is fixed to the bottom surface of the placement plate 21, and the edge of the groove wheel 23 is provided with a plurality of first arc grooves 24 corresponding to the clamp 8, and a plurality of notches 25 alternately arranged with the first arc grooves 24.

[0019] See also Figure 5 The driving mechanism 4 includes a rotating wheel 41, a second rotating shaft 42 is fixed at the center of the rotating wheel 41, the second rotating shaft 42 is fixed to the output end of the first motor 3, and the second rotating shaft 42 is rotatably connected to the machine 1. The edge of the rotating wheel 41 is provided with a second arc groove 43 adapted to the circumferential surface of the groove wheel 23, and a bottom plate 44 is fixed to the bottom of the second arc groove 43. A first lever 45 that can be rotated into the groove 25 is fixed on the bottom plate 44. The driving mechanism 4 and the groove wheel 23 form a Geneva structure. When the first motor 3 is working, it can drive the rotating wheel 41 to rotate through the second rotating shaft 42, and the first lever 45 on the bottom plate 44 moves the notch 25 in the groove wheel 23. Since the notches 25 of the groove wheel 23 are evenly distributed according to the number of clamps 8, when the rotating wheel 41 rotates one circle, the rotation angle of the groove wheel 23 is fixed, and the second arc groove 43 on the rotating wheel 41 is consistent with the wheel surface of the groove wheel 23 to ensure that the disc friction plate 9 on the groove wheel 23 can stay at the detection position of the detection mechanism 7.

[0020] See also Figure 7 and Figure 8 The detection mechanism 7 includes a top plate 71, a fourth rotating shaft 72 is fixed at the center position of the top plate 71, a shaft sleeve 73 is rotatably connected to the top outer side of the fourth rotating shaft 72, and a torsion spring is clamped at the connection between the fourth rotating shaft 72 and the shaft sleeve 73, and the shaft sleeve 73 is fixed to the output end of the cylinder 6. A first slide groove 74 and a second slide groove 75 are radially opened on the top plate 71. A detection radius measurement and control unit that can adjust the detection radius according to the rotation period of the driving mechanism 4 is arranged in the first slide groove 74, and an adjustment member that can adaptively adjust the sweeping detection according to the arc of the disc friction plate 9 is arranged in the second slide groove 75.

[0021] It should be noted that the measurement and control unit includes an encoder, a controller and a detection probe 79. A slider 78 is fixed on the top of the detection probe 79. The slider 78 is slidably connected to the first slide groove 74. A second motor 76 is fixed at one end of the first slide groove 74. A threaded rod 77 threadedly connected to the slider 78 is fixed at the output end of the second motor 76. The encoder is used to detect the rotation cycle of the drive mechanism 4 and feed back to the controller after the drive mechanism 4 reaches the set cycle. The second motor 76 drives the detection probe 79 to increase the detection radius under the control of the controller. When the drive mechanism 4 drives the placement plate 21 to rotate, The encoder can detect the rotation period of the driving mechanism 4 and feed back to the controller after the driving mechanism 4 reaches the set period, that is, when the placement plate 21 rotates one circle, the second motor 76 drives the threaded rod 77 under the control of the controller. The threaded relationship between the threaded rod 77 and the slider 78 and the sliding limit of the slider 78 by the first slide groove 74 increase the detection radius of the detection probe 79. The detection probe 79 adopts a spring-loaded sliding rheostat. The current changes due to the displacement change of the sliding rheostat when it is extended and retracted, and the current is converted into an electrical signal and fed back to the measurement and control unit, thereby realizing thickness detection.

[0022] Furthermore, the adjusting member includes a fixing plate 710 capable of sliding in the second slide groove 75. The fixing plate 710 is fixed to the top plate 71 by bolts. A second lever 711 is fixed to the bottom of the fixing plate 710. The fixing plate 710 slides in the second slide groove 75 to adjust the position of the second lever 711, thereby adjusting the initial spacing from the third rotating shaft 102. The smaller the initial spacing between the second lever 711 and the third rotating shaft 102, the larger the scanning range of the detection probe 79. Conversely, the larger the initial spacing between the second lever 711 and the third rotating shaft 102, the smaller the scanning range of the detection probe 79, so as to adapt to the detection of disc friction plates 9 with different curvatures.

[0023] See also Figure 6 The flat sweeping mechanism 10 includes a rotating disk 101, a third rotating shaft 102 is fixed at the bottom of the rotating disk 101, and the third rotating shaft 102 is rotatably connected to the frame 5. A first sprocket 103 is fixed to the outer side of the third rotating shaft 102, and a second sprocket 104 is fixed to the top of the second rotating shaft 42. The first sprocket 103 and the second sprocket 104 are connected by a chain 105. A blocking portion 106 protruding in a conch shape is provided at the edge of the rotating disk 101. When the rotating wheel 41 rotates, the second sprocket 104 at the top of the second rotating shaft 42 and the first sprocket 103 on the outer side of the third rotating shaft 102 are driven by the chain 105, so that the rotating disk 101 can rotate synchronously, and then the rotating disk 101 pushes the second lever 711 through the blocking portion 106 during the rotation process, so that the top plate 71 rotates synchronously with the fourth rotating shaft 72 as the center.

[0024] It should be noted that the third rotating shaft 102 is concentrically arranged with the first rotating shaft 22, the third rotating shaft 102 is eccentrically arranged with the fourth rotating shaft 72, the fourth rotating shaft 72 is concentrically arranged with the axis of the disc friction plate 9, and the distance between the second lever 711 and the third rotating shaft 102 gradually increases when rotating around the fourth rotating shaft 72 until it disengages from the blocking portion 106. At this time, the top plate 71 is reset under the elastic force of the torsion spring, that is, when the placement plate 21 is at the rotation switching angle, the detection probe 79 is just in the idle period and remains in a fixed position on one side of the disc friction plate 9. When the placement plate 21 is in the intermittent period when the rotation stops, the detection probe 79 can just perform a flat scanning detection on the disc friction plate 9 below and automatically reset.

[0025] The working principle and use process of the present invention are as follows: when in use, install a plurality of disc friction plates 9 Figure 3 As shown, they are placed one by one and clamped and fixed by the clamp 8, and then the cylinder 6 drives the detection mechanism 7 to descend until it reaches the detection position height, the first motor 3 works to drive the rotating wheel 41 to rotate through the second rotating shaft 42, and the first lever 45 on the bottom plate 44 moves the notch 25 in the groove wheel 23. Since the notches 25 of the groove wheel 23 are evenly distributed according to the number of the clamps 8, when the rotating wheel 41 rotates one circle, the rotation angle of the groove wheel 23 is fixed, and the second arc groove 43 on the rotating wheel 41 is consistent with the wheel surface of the groove wheel 23 to ensure that the disc friction plate 9 on the groove wheel 23 can stay at the detection position of the detection mechanism 7; When the rotating wheel 41 rotates, the second sprocket 104 at the top of the second rotating shaft 42 and the first sprocket 103 outside the third rotating shaft 102 are driven by the chain 105, so that the rotating disk 101 can rotate synchronously, and then the rotating disk 101 pushes the second lever 711 through the blocking part 106 during the rotation process, so that the top plate 71 rotates synchronously around the fourth rotating shaft 72; When the placement plate 21 is rotating, the blocking portion 106 of the rotating plate 101 and the second lever 711 are in the following Figure 9 During the idle period shown, after the placement plate 21 completes the rotation of the fixed angle, the turntable 101 rotates clockwise just at Figure 10At the position shown, the rotation of the turntable 101 can push the second lever 711 by the blocking portion 106 at this time, so that the top plate 71 overcomes the elastic force of the torsion spring and rotates clockwise synchronously with the turntable 101. Furthermore, the flat-sweeping detection of the position near the inner arc surface of the disc friction plate 9 is carried out by the detection probe 79. Since the third rotating shaft 102 is concentric with the first rotating shaft 22, the third rotating shaft 102 is eccentrically arranged with the fourth rotating shaft 72, the fourth rotating shaft 72 is concentric with the axis of the disc friction plate 9, and the distance between the second lever 711 and the third rotating shaft 102 gradually increases until it disengages from the blocking portion 106 when rotating around the fourth rotating shaft 72. At this time, the top plate 71 is reset under the elastic force of the torsion spring, that is, when the placing disc 21 is at the rotation switching angle, the detection probe 79 just stays in the fixed position on one side of the disc friction plate 9 during the idle period, and when the placing disc 21 is at the intermittent period of rotation stop, the detection probe 79 can just carry out the flat-sweeping detection on the lower disc friction plate 9 and automatically reset; When the driving mechanism 4 drives the placing disc 21 to rotate, the encoder can detect the rotation period of the driving mechanism 4 and feedback it to the controller after the driving mechanism 4 reaches the set period, that is, when the placing disc 21 rotates one week, the second motor 76 drives the threaded rod 77 under the control of the controller. Due to the threaded relationship between the threaded rod 77 and the slider 78, and at the same time, under the sliding limit of the first chute 74 on the slider 78, the detection radius of the detection probe 79 is increased. Through the above process, the comprehensive detection of the disc friction plate 9 from the inner arc to the outer arc surface position is realized, and then the thickness of different positions of each disc friction plate 9 is accurately measured.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A thickness detection device for a disc friction plate, comprising a machine table (1) and a frame (5) fixed on the machine table (1), characterized in that, A rotating mechanism (2) is provided on the machine table (1). A number of annularly distributed disc friction plates (9) are placed above the rotating mechanism (2). A number of clamps (8) for fixing the disc friction plates (9) are provided on the top of the rotating mechanism (2). A first motor (3) is fixed below the machine table (1). A driving mechanism (4) is provided on the machine table (1) to drive the rotating mechanism (2) to rotate intermittently under the drive of the first motor (3). A cylinder (6) is fixed on the top surface of the frame (5). A detection mechanism (7) that moves up and down under the drive of the cylinder (6) and a sweeping mechanism (10) that drives the detection mechanism (7) to perform a flat sweep detection on the disc friction plates (9) below during the rotation interval of the rotating mechanism (2) are provided below the frame (5) under the synchronous drive of the driving mechanism (4).

2. The thickness detection device of a disc friction plate according to claim 1, wherein, The rotating mechanism (2) includes a placing disc (21). A first rotating shaft (22) is fixed at the central position of the placing disc (21). The first rotating shaft (22) is rotatably connected to the machine table (1). A sprocket (23) is fixed to the bottom surface of the placing disc (21). A number of first arc-shaped grooves (24) corresponding to the clamps (8) are provided on the edge of the sprocket (23), and a number of notches (25) alternately arranged with the first arc-shaped grooves (24) are provided.

3. The thickness detection device for a disc friction plate according to claim 2, characterized in that, The driving mechanism (4) includes a runner (41). A second rotating shaft (42) is fixed at the central position of the runner (41). The second rotating shaft (42) is rotatably connected to the machine table (1). A second arc-shaped groove (43) adapted to the circumferential surface of the sprocket (23) is provided on the edge of the runner (41). A bottom plate (44) is fixed at the bottom of the second arc-shaped groove (43). A first lever (45) that can be inserted into the notch (25) is fixed on the bottom plate (44).

4. The thickness detection device for a disc friction plate according to claim 3, wherein, The detection mechanism (7) includes a top disc (71). A fourth rotating shaft (72) is fixed at the central position of the top disc (71). A bushing (73) is rotatably connected to the outer side of the top of the fourth rotating shaft (72), and a torsion spring is clamped at the connection between the fourth rotating shaft (72) and the bushing (73). The bushing (73) is fixed to the output end of the cylinder (6). A first sliding groove (74) and a second sliding groove (75) are radially formed on the top disc (71). A detection radius measurement and control unit that can adjust according to the rotation period of the driving mechanism (4) is provided in the first sliding groove (74), and an adjusting member that can perform a sweeping detection according to the radian of the disc friction plate (9) for adaptive adjustment is provided in the second sliding groove (75).

5. The thickness detection device of a disc friction plate according to claim 4, characterized in that, The measurement and control unit includes an encoder, a controller and a detection probe (79). A slider (78) is fixed to the top of the detection probe (79). The slider (78) is slidably connected in a first chute (74). A second motor (76) is fixed to one end of the first chute (74). A threaded rod (77) threadedly connected to the slider (78) is fixed to the output end of the second motor (76). The encoder is used to detect the rotation period of the driving mechanism (4) and feedback to the controller after the driving mechanism (4) reaches the set period, and the second motor (76) drives the detection probe (79) to increase the detection radius under the control of the controller.

6. The thickness detection device of a disc friction plate according to claim 4, characterized in that, The adjusting member includes a fixing piece (710) capable of sliding in a second chute (75). The fixing piece (710) is fixed to the top plate (71) by bolts. A second lever (711) is fixed to the bottom of the fixing piece (710).

7. The thickness detection device of a disc friction plate according to claim 6, wherein The horizontal scanning mechanism (10) includes a turntable (101). A third rotating shaft (102) is fixed to the bottom of the turntable (101). The third rotating shaft (102) is rotatably connected to the frame (5). A first sprocket (103) is fixed to the outside of the third rotating shaft (102). A second sprocket (104) is fixed to the top end of the second rotating shaft (42). The first sprocket (103) and the second sprocket (104) are connected by a chain (105). A blocking portion (106) protruding in a conch shape is provided on the edge of the turntable (101).

8. The thickness detection device of a disc friction plate according to claim 7, characterized in that, The third rotating shaft (102) is concentric with the first rotating shaft (22). The third rotating shaft (102) is eccentric with the fourth rotating shaft (72). The fourth rotating shaft (72) is concentric with the axis of the disc friction plate (9).

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