Metal flexible shaft torque measuring device

Abstract

The utility model relates to metal flexible shaft detection field discloses a kind of metal flexible shaft torque measuring equipment.It includes base, clamping rotation drive component installed on base, clamping piece and bending degree adjusting component, clamping rotation drive component is used to clamping and drive metal flexible shaft rotation to metal flexible shaft one end, clamping piece is used to clamping and is synchronous with metal flexible shaft rotation to metal flexible shaft other end, clamping rotation drive component is connected and fixed with base sliding along the direction perpendicular to metal flexible shaft axial direction;Bending degree adjusting component is driven to realize the bending adjustment of multiple directions to metal flexible shaft.The utility model can be adjusted to metal flexible shaft in multiple directions and multiple bending rate, the state of metal flexible shaft can be more close to actual scene, and the torque of metal flexible shaft in more accurate actual scene is measured further;Make test scene more diversified, satisfy measurement under multiple scenes.

Description

Technical Field

[0001] This utility model relates to the field of metal flexible shaft testing technology, and more specifically, to a metal flexible shaft torque measuring device. Background Technology

[0002] A flexible metal shaft is a bendable transmission component, particularly suitable for confined spaces, and is commonly used in marine water pumps, medical devices, machine tool transmissions, and automotive odometers. After machining, the torque of the flexible metal shaft needs to be measured using torque measuring equipment. Existing torque measuring equipment for flexible metal shafts mainly uses a first three-jaw chuck and a second three-jaw chuck to clamp both ends of the flexible metal shaft. A motor then drives the first three-jaw chuck to rotate, while the second three-jaw chuck rotates under the influence of the flexible metal shaft. A connecting rope is wound around the second three-jaw chuck, and the other end of the connecting rope is connected to a tension gauge, which is located above the second three-jaw chuck. The winding of the connecting rope applies tension to the tension gauge, thereby obtaining the torque of the flexible metal shaft.

[0003] However, in the above technology, the two three-jaw chucks are set on the same axis, which can only measure the torque when the two ends of the metal flexible shaft are concentric. In actual scenarios, the metal flexible shaft will be tilted or bent. The existing metal flexible shaft torque measurement equipment has a relatively simple measurement scenario and cannot meet the measurement of the torque value of the metal flexible shaft in different scenarios. Therefore, it is impossible to obtain a more accurate torque value of the metal flexible shaft in actual scenarios. Utility Model Content

[0004] To address at least one of the aforementioned problems, this utility model provides a metal flexible shaft torque measuring device, comprising a base, a clamping and rotating drive assembly, a clamping member, and a bending adjustment assembly mounted on the base. The clamping and rotating drive assembly clamps one end of the metal flexible shaft and drives it to rotate. The clamping member clamps the other end of the metal flexible shaft and rotates synchronously with it. The clamping and rotating drive assembly is slidably connected to and fixed to the base in a direction perpendicular to the axial direction of the metal flexible shaft. The bending adjustment assembly includes a magnetic universal base and a guide wheel. The magnetic universal base is connected to the guide wheel to drive it to rotate or move in multiple directions. The guide wheel contacts the metal flexible shaft to drive it to achieve multi-directional bending adjustment.

[0005] Optionally, the magnetic universal base includes a magnetic base, a column, a clamping adjustment member, and an adjustment column. The magnetic base is adapted to be adsorbed and fixed on the base platform. The column is fixedly connected to the magnetic base and extends vertically. The clamping adjustment member is rotatably slidably sleeved on the column and can be fixed at any position on the column. The adjustment column is rotatably slidably sleeved on the clamping adjustment member and can be locked or unlocked by the clamping adjustment member. The guide wheel is connected to the adjustment column.

[0006] Optionally, a rotating plate is rotatably connected to the side wall of the adjusting column. The rotating plate is provided with a movable adjusting hole. A locking bolt that is threadedly connected to the adjusting column is inserted into the movable adjusting hole. The locking bolt is adapted to lock the rotation and movement of the rotating plate. The guide wheel is rotatably mounted on the rotating plate.

[0007] Optionally, the guide wheel is made of ceramic, and at least two guide wheels are spaced apart on the rotating plate.

[0008] Optionally, the clamping rotation drive assembly includes a drive motor, a motor base, and a first three-jaw chuck. Both the drive motor and the first three-jaw chuck are connected to the motor base. The first three-jaw chuck is adapted to clamp a metal flexible shaft, and the drive motor is adapted to drive the first three-jaw chuck to rotate the metal flexible shaft.

[0009] Optionally, the motor base is provided with bolt fixing holes, and the top of the base is provided with a waist-shaped adjustment hole communicating with the bolt fixing holes. The extension direction of the waist-shaped adjustment hole is perpendicular to the axial direction of the first three-jaw chuck. The waist-shaped adjustment hole passes through the base, and the motor base is adapted to move and adjust along the extension direction of the waist-shaped adjustment hole.

[0010] Optionally, the clamping member is a second three-jaw chuck, the base is provided with a support frame, the clamping member is rotatably mounted on the support frame, a winding disc is provided on the side of the clamping member away from the clamping rotation drive assembly, the winding disc rotates synchronously with the clamping member, a steel wire rope is wound on the winding disc, a tension gauge is provided on the support frame, one end of the tension gauge is connected to one end of the steel wire rope.

[0011] Optionally, a linear guide rail is fixedly provided on the top of the base, and a slider is slidably provided on the linear guide rail. The support frame is fixedly installed on the slider. A stop block is fixedly installed on the top of the base. The stop block is located at the end of the linear guide rail away from the clamping rotation drive assembly. A threaded rod is fixedly installed on the support frame. One end of the threaded rod passes through the stop block. A stop ring is threadedly connected to the threaded rod. The stop ring abuts against the side of the stop block away from the support frame.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0013] 1. The clamping rotation drive assembly can move and adjust along the direction perpendicular to the axis of the metal flexible shaft, so that the clamping rotation drive assembly and the clamping parts are in an inclined state, thereby measuring the torque of the metal flexible shaft in an inclined state. At the same time, the magnetic universal base can drive the guide wheel to achieve multi-directional adjustment, thereby adjusting the metal flexible shaft in multiple directions and multiple curvatures, so that the state of the metal flexible shaft can be closer to the actual scene, and thus measuring the torque of the metal flexible shaft in the actual scene more accurately.

[0014] 2. The curvature adjustment component can be fixed at any position via the magnetic base. Combined with the rotating plate, it can further increase the diversity of test scenarios. The two guide wheels can provide different winding methods, angles, and positions, making the test scenarios more diversified and meeting the measurement needs of various scenarios.

[0015] 3. The ceramic guide wheel is more wear-resistant and its surface remains relatively smooth even after long-term use. It is also less susceptible to corrosion from moisture in the air, effectively improving the service life of the entire curvature adjustment component. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the torque measuring device in an embodiment of the present invention;

[0017] Figure 2 This is a structural diagram of the clamping component and support frame in the embodiments of this utility model;

[0018] Figure 3 This is a structural diagram of the curvature adjustment component in an embodiment of the present invention;

[0019] Figure 4 This is an exploded view of the curvature adjustment component in an embodiment of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Base; 11. Waist-shaped adjustment hole; 12. Support frame; 13. Tensile gauge; 14. Linear guide rail; 15. Slider; 16. Stop block; 17. Threaded rod; 18. Stop ring; 2. Clamping rotation drive assembly; 21. Drive motor; 22. Motor base; 23. First three-jaw chuck; 3. Clamping component; 31. Winding reel; 4. Bending adjustment assembly; 41. Magnetic universal joint base; 42. Guide wheel; 43. Magnetic base; 44. Column; 45. Clamping adjustment component; 451. Clamping block; 452. Bolt column; 453. Collar; 454. Hand-tightening nut; 46. Adjusting column; 47. Rotating plate. Detailed Implementation

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figure 1-4 This application will be described in further detail.

[0022] This utility model embodiment provides a metal flexible shaft torque measuring device, referencing... Figure 1 The metal flexible shaft torque measuring device includes a base 1, a clamping and rotating drive assembly 2 mounted on the base 1, a clamping member 3, and a bending adjustment assembly 4. The clamping and rotating drive assembly 2 clamps one end of the metal flexible shaft and drives it to rotate. The clamping member 3 clamps the other end of the metal flexible shaft and rotates synchronously with it. The clamping and rotating drive assembly 2 is slidably connected to the base 1 in a direction perpendicular to the axial direction of the metal flexible shaft and can be fixed at any position. The bending adjustment assembly 4 contacts the metal flexible shaft to drive it to achieve multi-directional bending adjustment, making the state of the metal flexible shaft more closely resemble the actual scenario, thereby obtaining a more accurate measurement of the torque of the metal flexible shaft in the actual scenario.

[0023] Reference Figure 1 The clamping rotation drive assembly 2 includes a drive motor 21, a motor base 22, and a first three-jaw chuck 23. Both the drive motor 21 and the first three-jaw chuck 23 are connected to the motor base 22. The first three-jaw chuck 23 is adapted to clamp a flexible metal shaft, and the drive motor 21 is adapted to drive the first three-jaw chuck 23 to rotate the flexible metal shaft. The drive motor 21, motor base 22, and first three-jaw chuck 23 move synchronously relative to the base 1. Assuming the axis of the first three-jaw chuck 23 is the left-right direction, then the clamping members 3 and the clamping rotation drive assembly 2 are arranged at intervals along the left-right direction. In another embodiment, the clamping cylinder can be replaced by the first three-jaw chuck 23.

[0024] The motor mount 22 has at least two bolt fixing holes spaced apart. The top of the base 1 has at least two oblong adjustment holes 11 communicating with the corresponding bolt fixing holes. The extension direction of the oblong adjustment holes 11 is perpendicular to the axial direction of the first three-jaw chuck 23; that is, the oblong adjustment holes 11 extend in the front-to-back direction and penetrate the base 1. The motor mount 22 is adapted to move and adjust along the extension direction of the oblong adjustment holes 11. After the bolts are inserted into the bolt fixing holes, they pass through the oblong adjustment holes 11 and are located at the bottom of the base 1, where they are threadedly connected to the corresponding nuts, thus fixing the motor mount 22 to the base 1. If it is necessary to move the motor mount 22, the bolts and nuts fixing the motor mount 22 can be loosened, thereby tilting the first three-jaw chuck 23 and the clamping member 3, and measuring the torque under the tilted condition of the metal flexible shaft.

[0025] Reference Figures 1 to 2In this embodiment, the preferred clamping component 3 is a second three-jaw chuck. In another embodiment, the clamping component 3 can be a rotary clamping cylinder. A support frame 12 is slidably mounted on the top of the base 1. The clamping component 3 is rotatably mounted on the support frame 12. A winding reel 31 is bolted to the side of the clamping component 3 away from the first three-jaw chuck 23. The winding reel 31 is concentrically arranged with the second three-jaw chuck and rotates synchronously. A steel wire rope is wound on the winding reel 31. A tension gauge 13 is provided on the support frame 12. The tension gauge 13 is located above the clamping component 3. One end of the tension gauge 13 is hung on the support frame 12 by a hook; the other end is connected to one end of the steel wire rope. When measuring the torque of the metal flexible shaft, first rotate the clamping member 3 to make the wire rope taut and record the value on the tension gauge 13 at this time. Then, manually fix the rotation of the clamping member 3, and then clamp one end of the metal flexible shaft with the clamping member 3 and the other end with the first three-jaw chuck 23. After the drive motor 21 drives the metal flexible shaft to rotate slowly, the metal flexible shaft will drive the clamping member 3 and the winding reel 31 to rotate, so that the wire rope is wound on the winding reel 31 and generates tension on the tension gauge 13. At this time, record the value on the tension gauge 13.

[0026] A linear guide rail 14 is bolted to the top of the base 1, and a slider 15 slides on the linear guide rail 14. A support frame 12 is bolted to the top of the slider 15, allowing the support frame 12, clamping member 3, tension gauge 13, and winding reel 31 to slide synchronously relative to the base 1. A stop block 16 is bolted to the top of the base 1, located at the end of the linear guide rail 14 away from the clamping rotation drive assembly 2. A threaded rod 17 is installed on the support frame 12. One end of the threaded rod 17 is inserted into the support frame 12 and clamped and fixed to the support frame 12 by two clamping nuts. The other end of the threaded rod 17 passes through the stop block 16. A stop ring 18 is threadedly connected to the threaded rod 17. The stop ring 18 abuts against the side of the stop block 16 away from the support frame 12 to limit the movement of the support frame 12 toward the first three-jaw chuck 23, so that the metal flexible shaft is in a taut state during measurement. In addition, by adjusting the position of the stop ring 18, the distance between the first three-jaw chuck 23 and the second three-jaw chuck can be adjusted, thereby testing metal flexible shafts of different lengths.

[0027] Reference Figures 3 to 4 The curvature adjustment assembly 4 includes a magnetic universal base 41 (prior art) and a guide wheel 42. The magnetic universal base 41 is connected to the guide wheel 42 to drive the guide wheel 42 to rotate or move in multiple directions. The guide wheel 42 contacts a flexible metal shaft to cause the flexible metal shaft to bend. The guide wheel 42 is made of ceramic, which is more wear-resistant and its surface remains relatively smooth even after long-term use, effectively improving the service life of the entire curvature adjustment assembly 4.

[0028] Reference Figures 3 to 4The magnetic universal joint base 41 includes a magnetic base 43, a column 44, a clamping adjustment member 45, and an adjustment column 46. The base 1 is made of cast iron. The magnetic base 43 is equipped with a mechanism to control the generation or demagnetization of magnetic force, so that the magnetic base 43 and the base 1 can be attracted and fixed or released from the attraction and fixation relationship for movement. The column 44 and the adjustment column 46 are both cylinders. The column 44 is fixedly connected to the magnetic base 43 and extends vertically. The clamping adjustment member 45 is rotatably slidably sleeved on the column 44 and can be fixed at any position on the column 44. The adjustment column 46 is rotatably slidably sleeved on the clamping adjustment member 45 and can be locked or unlocked by the clamping adjustment member 45.

[0029] Reference Figures 3 to 4 The clamping adjustment component 45 includes a clamping block 451, a bolt post 452, a collar 453, and a hand-tightening nut 454. The clamping block 451 has a circular groove for the column 44 to be fitted and rotatably connected to the column 44. A deformation groove is formed on one side of the groove wall, and the deformation groove penetrates the clamping block 451 in both the opening direction and the vertical direction. A through hole is formed on the side of the clamping block 451 perpendicular to the axis of the column 44. The through hole communicates with the deformation groove. The bolt post 452 is inserted into the through hole, and both ends of the bolt post 452 protrude from the clamping block 451 in a cantilevered state. A first through hole is formed on the side wall of the bolt post 452 located outside the through hole. A collar 453 and a hand-tightening nut 454 are located on opposite sides of the clamping block 451. The collar 453 is fitted onto the end of the bolt post 452 with the first through hole, and the outer diameter of the collar 453 is larger than the diameter of the through hole. A second through hole is formed on the outer wall of the collar 453, which communicates with the first through hole. An adjusting post 46 is inserted into the first through hole and the second through hole. The hand-tightening nut 454 is threadedly connected to the bolt post 452. When the hand-tightening nut 454 is tightened, the collar 453 and the hand-tightening nut 454 can drive the clamping block 451 to deform into the deformation groove, so that the clamping block 451 is clamped and fixed on the column 44. At the same time, the bolt post 452 moves relative to the collar 453 towards the side closer to the hand-tightening nut 454, so that the first through hole and the second through hole are cross-aligned, thereby clamping and fixing the adjusting post 46. In this way, both the extension length and rotation angle of the adjustment can be adjusted.

[0030] A flat groove is formed on the side wall of one end of the adjusting column 46. A rotating plate 47 is rotatably connected to the groove wall. The rotating plate 47 is fixed to the adjusting column 46 by a locking bolt. When the locking bolt is not locked, the rotating plate 47 can rotate within a certain angle range around the locking bolt as the rotation axis. A movable adjustment hole is formed on the rotating plate 47. The locking bolt is inserted into the movable adjustment hole, so that the extension length of one end of the rotating plate 47 can be adjusted to adapt to various test scenarios. The locking bolt can also lock the movement of the rotating plate 47. Guide wheels 42 are rotatably mounted on the rotating plate 47 by bolts and nuts. At least two guide wheels are provided on the rotating plate 47 at intervals. In this embodiment, two guide wheels 42 are preferably provided.

[0031] The implementation principle of the metal flexible shaft torque measuring device in this application embodiment is as follows: the clamping rotation drive component 2 can be moved and adjusted in the direction perpendicular to the axial direction of the metal flexible shaft, so that the clamping rotation drive component 2 and the clamping member 3 are in an inclined state, thereby measuring the torque of the metal flexible shaft under the inclined state. At the same time, the magnetic universal base can drive the guide wheel 42 to achieve multi-directional adjustment, thereby adjusting the metal flexible shaft in multiple directions and multiple curvatures, so that the state of the metal flexible shaft can be closer to the actual scene, and thus measuring the torque of the metal flexible shaft in the actual scene more accurately.

[0032] Similarly, the components included in the "components," "mechanisms," and "devices" of this disclosure can also be flexibly combined. They can be modularly produced according to actual needs and assembled as an independent module; or they can be assembled separately to form a module in this device. The division of the above-mentioned components in this disclosure is only one embodiment for ease of reading and is not intended to limit the scope of protection of this disclosure. Any technical solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this disclosure.

[0033] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0036] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intervening component. When a component is considered to be "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above embodiments are merely illustrative of several implementation methods of this disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this disclosure, and these modifications and improvements all fall within the protection scope of this disclosure.

Claims

1. A metal flexible shaft torque measuring device characterized by: The device includes a base (1), a clamping and rotating drive assembly (2) mounted on the base (1), a clamping member (3), and a bending adjustment assembly (4). The clamping and rotating drive assembly (2) is used to clamp one end of the metal flexible shaft and drive the metal flexible shaft to rotate. The clamping member (3) is used to clamp the other end of the metal flexible shaft and rotate synchronously with the metal flexible shaft. The clamping and rotating drive assembly (2) is slidably connected to and fixed to the base (1) in a direction perpendicular to the axial direction of the metal flexible shaft. The bending adjustment assembly (4) includes a magnetic universal base (41) and a guide wheel (42). The magnetic universal base (41) is connected to the guide wheel (42) to drive the guide wheel (42) to rotate or move in multiple directions. The guide wheel (42) contacts the metal flexible shaft to drive the metal flexible shaft to achieve bending adjustment in multiple directions.

2. The metal bowden cable torque measurement apparatus of claim 1, wherein: The magnetic universal base (41) includes a magnetic base (43), a column (44), a clamping adjustment member (45), and an adjustment column (46). The magnetic base (43) is adapted to be adsorbed and fixed on the base (1). The column (44) is fixedly connected to the magnetic base (43). The column (44) extends in the vertical direction. The clamping adjustment member (45) is rotatably slidably sleeved on the column (44) and can be fixed at any position on the column (44). The adjustment column (46) is rotatably slidably sleeved on the clamping adjustment member (45) and can be locked or unlocked by the clamping adjustment member (45). The guide wheel (42) is connected to the adjustment column (46).

3. The metal bowden cable torque measurement apparatus of claim 2, wherein: The side wall of the adjusting column (46) is rotatably connected to a rotating plate (47). The rotating plate (47) is provided with a movable adjusting hole. A locking bolt that is threadedly connected to the adjusting column (46) is inserted into the movable adjusting hole. The locking bolt is suitable for locking the rotation and movement of the rotating plate (47). The guide wheel (42) is rotatably mounted on the rotating plate (47).

4. The metal bowden cable torque measurement apparatus of claim 3, wherein: The guide wheel (42) is made of ceramic material, and at least two guide wheels (42) are provided at intervals on the rotating plate (47).

5. The metal flex shaft torque measuring apparatus of claim 1, wherein: The clamping and rotating drive assembly (2) includes a drive motor (21), a motor base (22), and a first three-jaw chuck (23). The drive motor (21) and the first three-jaw chuck (23) are both connected to the motor base (22). The first three-jaw chuck (23) is adapted to clamp the metal flexible shaft. The drive motor (21) is adapted to drive the first three-jaw chuck (23) to rotate the metal flexible shaft.

6. The metal bowden cable torque measurement apparatus of claim 5, wherein: The motor base (22) is provided with bolt fixing holes, and the top of the base (1) is provided with a waist-shaped adjustment hole (11) that communicates with the bolt fixing holes. The extension direction of the waist-shaped adjustment hole (11) is perpendicular to the axial direction of the first three-jaw chuck (23). The waist-shaped adjustment hole (11) passes through the base (1), and the motor base (22) is adapted to move and adjust along the extension direction of the waist-shaped adjustment hole (11).

7. The metal flex shaft torque measuring apparatus of claim 1, wherein: The clamping member (3) is a second three-jaw chuck. The base (1) is provided with a support frame (12) on top. The clamping member (3) is rotatably mounted on the support frame (12). The clamping member (3) is provided with a winding disc (31) on the side away from the clamping rotation drive assembly (2). The winding disc (31) rotates synchronously with the clamping member (3). A steel wire rope is wound on the winding disc (31). A tension gauge (13) is provided on the support frame (12). One end of the tension gauge (13) is connected to one end of the steel wire rope.

8. The metal bowden cable torque measurement apparatus of claim 7, wherein: A linear guide rail (14) is fixedly mounted on the top of the base (1), and a slider (15) slides on the linear guide rail (14). The support frame (12) is fixedly mounted on the slider (15). A stop block (16) is fixedly mounted on the top of the base (1). The stop block (16) is located at the end of the linear guide rail (14) away from the clamping rotation drive assembly (2). A threaded rod (17) is fixedly mounted on the support frame (12). One end of the threaded rod (17) passes through the stop block (16). A stop ring (18) is threadedly connected to the threaded rod (17). The stop ring (18) abuts against the side of the stop block (16) away from the support frame (12).

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