Rotary test tool

Abstract

The utility model discloses a rotation test tool, which relates to the field of mechanical equipment and comprises a rack, the upper end part of the rack is slidably connected with an object placing plate used for placing a guide wheel set, the lower end part of the rack is fixedly provided with a cylinder I used for driving the object placing plate to lift, the upper end part of the rack is provided with two moving plates, and the moving plates are fixedly connected with the rack. The two moving plates are located on the two sides of the storage plate correspondingly and do reciprocating motion in the direction of the storage plate, two grabbing rods are arranged on the sides, close to the storage plate, of the moving plates and located at the two ends of the moving plates correspondingly, and a driving part is arranged between the two grabbing rods and used for driving the two grabbing rods to be slidably connected along the moving plates. Arc-shaped plates are fixedly arranged at the ends, deviating from the moving plate, of the grabbing rods, the two arc-shaped plates are matched for clamping the guide wheel set, a rotating assembly is arranged at the upper end of the rack and used for driving the moving plate to rotate, and a detecting device is fixedly arranged at the upper end of the rack and used for detecting the stress condition of the guide wheel set. The rotary test tool has the effect of improving the convenience of the rotary test tool.

Description

Technical Field

[0001] The utility model relates to the field of mechanical equipment, in particular to a rotary testing tool. Background Art

[0002] With the continuous advancement and innovation of mechanical manufacturing technology, modern industry has increasingly higher performance requirements for rotating parts, and has put forward more stringent standards in terms of speed, precision, stability and durability. Therefore, efficient and accurate testing of the performance of rotating parts has become a key link in ensuring product quality.

[0003] Related technology can refer to the Chinese patent announcement number CN207730447U, which discloses a guide wheel running-in test device, including a shell, a first motor fixedly provided in the top end of the outer shell, the output end of the first motor is transmission-connected to one end of the lead screw, the other end of the lead screw is movably connected to the middle of the pressure block, one side of the pressure block is slidingly connected to a slide groove provided on a side wall of the inner shell through a slider, and the interior of one side of the shell is rotatably connected to the middle of the turntable through a rotating shaft. The utility model is provided with a first motor and a lead screw, and the first motor drives the lead screw to rotate, thereby adjusting the height of the pressure block, and adjusting it according to the size of the guide wheel. By providing a hydraulic press, the height of the bottom plate and the driving wheel, etc. are adjusted, and the height is adjusted according to guide wheels of different specifications. It has strong applicability, and by providing an electric telescopic rod and a high-precision displacement sensor, the outer ring of the guide wheel is detected during the running-in process to avoid unqualified shape and uneven surface of the guide wheel.

[0004] Regarding the above-mentioned related technologies, the guide wheel assembly needs to be accurately lifted between the driving wheel and the driven wheel during the test. Some guide wheel assemblies are large in size, and their weight brings considerable difficulties to the lifting work, requiring the staff to expend a lot of energy and physical strength, resulting in a lack of convenience in the entire testing process. Utility Model Content

[0005] In order to improve the convenience of a rotary test tool, the present application provides a rotary test tool.

[0006] This application provides a rotary test fixture, which adopts the following technical solutions:

[0007] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion.

[0008] By adopting the above technical solution, when the guide wheel group needs to be inspected, the guide wheel group is placed on the placement plate, and the cylinder is started to drive the placement plate to rise, and the two movable plates move in the direction of approaching each other, and the movement of the movable plate drives the grab bar to move, driving the driving part, so that the two grab bars move in the direction of approaching each other, and the movement of the grab bar drives the arc plate to move, and the two cooperate to clamp the guide wheel group, and the rotating component is started to drive the movable plate to rotate, and the rotation of the movable plate drives the grab bar to rotate, and the rotation of the grab bar drives the arc plate to rotate, further realizing the rotation of the guide wheel group, so that different positions of the guide wheel group contact with the detection device, which is conducive to accurate detection of the guide wheel group.

[0009] Optionally, a motor 2 is fixedly provided at the upper end of the frame, a gear 1 is fixedly provided at the output shaft of the motor 2, a gear 2 is rotatably connected to the lower end of the gear, and the gear 2 is meshed with the gear 1, a screw is rotatably connected to the side of the movable plate (15) away from the grab bar, the screw is coaxially fixed with the gear 2, and the screw passes through the gear 2 and is threadedly connected to the gear 2, a disc 2 is provided on the side of the screw close to the gear 2, and the screw is rotatably connected to the disc 2.

[0010] By adopting the above technical solution, motor 2 is started to drive gear 1 to rotate, and the rotation of gear 1 drives gear 2 to rotate. Disc 2 limits the screw, so that when gear 2 rotates, it drives the screw to move horizontally, and the horizontal movement of the screw drives the movable plate to move horizontally, further realizing the clamping of the guide wheel group by the arc block, which is conducive to improving the convenience of the rotary test tooling.

[0011] Optionally, the rotating assembly includes motor 1, disc 1, disc 2, a belt and a telescopic rod, motor 1 is fixed to the upper end of the frame, disc 1 is coaxially fixed with the output shaft of motor 1, disc 2 and disc 1 are located in the same plane, the belt is located between disc 1 and disc 2, and disc 1 and disc 2 are both rollingly connected to the belt, two telescopic rods are located between disc 2 and the movable plate, and one end of the telescopic rod is fixedly connected to disc 2, and the other end is fixedly connected to the movable plate.

[0012] By adopting the above technical solution, the movement of motor 1 drives the rotation of disc 1, the rotation of disc 1 drives the rotation of belt, the rotation of belt drives the rotation of disc 2, the rotation of disc 2 drives the rotation of telescopic rod, the rotation of telescopic rod drives the rotation of movable plate, thereby further realizing the rotation of guide wheel group, which is beneficial to improving the convenience of rotary test tooling.

[0013] Optionally, a lifting plate is provided at the lower end of the storage plate along a vertical sliding connection, the lifting plate is fixedly connected to an output end of a cylinder, a baffle is provided on the lifting plate in a sliding connection, the two baffles are respectively located on both sides of the lifting plate, and the two baffles are slidingly connected to the lifting plate in a direction of approaching or moving away from each other, a bidirectional screw is provided at the lower end of the baffle, the bidirectional screw is arranged along the sliding direction of the baffle, the two ends of the bidirectional screw respectively pass through the two baffles and are threadedly connected to the baffle, and the bidirectional screw is rotatably connected to the lifting plate, an empty slot is opened on the storage plate, and the baffle passes through the empty slot to abut the guide wheel group.

[0014] By adopting the above technical solution, when the guide wheel group needs to be tested, the cylinder is started to drive the lifting plate to rise, and the lifting plate drives the baffle to rise, so that the baffle passes through the empty slot, and the two-way screw is adjusted to make the two baffles slide in the direction of approaching each other. The two baffles abut the guide wheel group on the placement plate, reducing the probability of the guide wheel group rolling on the placement plate, and there is no need to lift the guide wheel group, thereby improving the convenience of the rotation test tooling.

[0015] Optionally, a groove is provided on the storage plate, and two limit plates are provided in the groove. The limit plates are connected to the storage plate in a transverse sliding manner, and the moving direction of the limit plates is perpendicular to the moving direction of the baffle. An elastic member is fixed between the limit plates and the inner wall of the groove, and the elastic member is used to drive the two limit plates closer to each other.

[0016] By adopting the above technical solution, the guide wheel group is rolled along the direction of the limit plate to the groove. Under the action of the elastic member, the limit plate presses against the lower end of the guide wheel group. It is suitable for guide wheel groups of different sizes and improves the flexibility of the rotation test tooling.

[0017] Optionally, a rotating wheel is provided at the upper end of the baffle, the rotating wheel is located on the side where the two baffles are close to each other, and is connected to the baffle in a vertical rotation.

[0018] By adopting the above technical solution, the rotating wheel reduces the friction of the baffle on the guide wheel group, reduces the probability of the baffle getting stuck on the guide wheel group when the baffle descends, and improves the stability of the rotating test fixture.

[0019] Optionally, the detection device includes cylinder 2, a pressure plate, a pressure sensor and an alarm. Cylinder 2 is fixed to the upper end of the frame, the pressure plate is fixed to the output end of cylinder 2, and the pressure plate is connected to the frame in a horizontal sliding direction, and the pressure plate is located between the two movable plates. When the pressure plate moves, it approaches or moves away from the rotation axis of the movable plate. The pressure sensor is fixed on the pressure plate and is used to contact the outer edge of the guide wheel and capture force data. The alarm is fixed on the upper end of the frame and is used to warn of abnormal guide wheel groups.

[0020] By adopting the above technical solution, when the guide wheel group needs to be tested, cylinder 2 is started to drive the pressure plate to move toward the guide wheel group, so that the pressure plate contacts the guide wheel group. It is suitable for guide wheel groups of different sizes, which is beneficial to improving the applicability of the rotation test tooling. The pressure sensor senses the pressure generated on the pressure plate at different positions on the outer edge of the guide wheel group, and the alarm warns of abnormal force data, which is beneficial to improving the intelligence of the rotation test tooling.

[0021] Optionally, the driving member includes a bidirectional screw 2 and a driving block. The bidirectional screw 2 is located between the two grab bars and is arranged along the moving direction of the grab bars. The bidirectional screw 2 is rotatably connected to the movable plate. The two driving blocks are located at both ends of the bidirectional screw 2. The driving blocks are threadedly connected to the bidirectional screw 2. The driving blocks correspond one-to-one to the grab bars, and the driving blocks are fixedly connected to the corresponding grab bars.

[0022] By adopting the above technical solution, when the guide wheel group needs to be clamped, the driving block is rotated, and the screw drives the two grab bars to move in a direction approaching each other, so that the arc plate cooperates to clamp the guide wheel group, which is conducive to improving the convenience of the rotary test tooling.

[0023] In summary, the present application includes at least one of the following beneficial technical effects of the rotary test fixture:

[0024] 1. When the guide wheel assembly needs to be tested, the cylinder is started to drive the lifting plate to rise, and the lifting plate drives the baffle to rise, so that the baffle passes through the empty slot. The two-way screw is adjusted to make the two baffles slide in the direction of approaching each other. The two baffles abut the guide wheel assembly on the placement plate, reducing the probability of the guide wheel assembly rolling on the placement plate. It is no longer necessary to lift the guide wheel assembly to achieve this, which improves the convenience of the rotary test fixture;

[0025] 2. Roll the guide wheel assembly along the direction of the limit plate to the groove. Under the action of the elastic member, the limit plate presses against the lower end of the guide wheel assembly. This is suitable for guide wheel assemblies of different sizes, improving the flexibility of the rotary test fixture.

[0026] 3. The rotating wheel reduces the friction between the baffle and the guide wheel assembly, reduces the probability of the baffle getting stuck on the guide wheel assembly when the baffle descends, and improves the stability of the rotating test fixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a rotary test fixture.

[0028] Figure 2 It is a schematic diagram intended to highlight the connection structure of the storage plate in the embodiment.

[0029] Figure 3 It is a schematic diagram intended to highlight the connection structure of the movable plate in the embodiment.

[0030] Figure 4 It is a schematic diagram intended to highlight the connection structure of the pressure plates in the embodiment.

[0031] Explanation of the accompanying reference numerals: 1. Frame; 11. Cylinder 1; 111. Lifting plate; 112. Baffle; 113. Bidirectional screw 1; 114. Rotating wheel; 12. Storage plate; 121. Groove; 122. Elastic member; 123. Limiting plate; 124. Empty slot; 13. Motor 1; 131. Disc 1; 132. Disc 2; 133. Belt; 134. Telescopic rod; 14. Motor 2; 141. Gear 1; 142. Gear 2; 143. Screw; 15. Moving plate; 151. Grab bar; 152. Arc plate; 153. Bidirectional screw 2; 154. Driving block; 16. Cylinder 2; 161. Pressure plate; 162. Pressure sensor; 163. Alarm. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0033] An embodiment of the present application discloses a rotary testing tool. Example

[0034] Reference Figure 1 and Figure 2The limit plate 123 is adjustable and suitable for guide wheel groups of different sizes, thereby improving the flexibility of the rotary test tool.

[0035] Reference Figure 1 and Figure 2 A cylinder 11 is fixed to the lower end of the frame 1, and a lifting plate 111 is vertically slidably connected to the lower end of the storage plate 12. The lifting plate 111 is fixedly connected to the output end of the cylinder 11. When the cylinder 11 is started, the lifting plate 111 is driven to rise and fall. A baffle 112 is slidably connected to the lifting plate 111. The two baffles 112 are respectively located on both sides of the lifting plate 111, and the two baffles 112 are slidably connected to the lifting plate 111 in a direction of approaching or moving away from each other. The lifting of the lifting plate 111 drives the baffle 112 to rise and fall. An empty slot 124 is opened on the storage plate 12. When the guide wheel group needs to be abutted, the baffle 112 rises and passes through the empty slot 124.

[0036] Reference Figure 1 and Figure 2 A bidirectional lead screw 113 is provided at the lower end of the baffle 112, and the bidirectional lead screw 113 is arranged along the sliding direction of the baffle 112. The two ends of the bidirectional lead screw 113 pass through the two baffles 112 respectively and are threadedly connected to the baffle 112, and the bidirectional lead screw 113 is rotatably connected to the lifting plate 111. The bidirectional lead screw is rotated to make the two baffles 112 slide in a direction approaching each other, and the two baffles 112 abut against the guide wheel group on the placement plate, reducing the probability of the guide wheel group rolling on the placement plate.

[0037] Reference Figure 2 A rotating wheel 114 is provided at the upper end of the baffle 112. The rotating wheel 114 is located on the side where the two baffles 112 are close to each other and is connected to the baffle 112 along the vertical rotation. The rotating wheel 114 reduces the friction of the baffle 112 on the guide wheel group, and reduces the probability of the baffle 112 getting stuck on the guide wheel group when the baffle 112 descends, thereby improving the stability of the rotating test tooling.

[0038] Reference Figure 3, the upper end of the frame 1 is provided with two movable plates 15, and the two movable plates 15 are respectively located on both sides of the storage plate 12. The upper end of the frame 1 is fixed with a motor 2 14, and the output shaft of the motor 2 14 is fixed with a gear 141. When the motor 2 14 is started, the gear 141 is driven to rotate. The lower end of the gear 141 is connected to the gear 2 142, and the gear 2 142 is engaged with the gear 141. The rotation of the gear 141 drives the gear 2 142 to rotate, and the two movable plates 15 are away from each other. The screw 143 is rotatably connected and coaxially fixed with the gear 2 142. The screw 143 passes through the gear 2 142 and is threadedly connected with the gear 2 142. A disc 2 132 is provided on the side of the screw 143 close to the gear 2 142. The screw 143 is rotatably connected to the disc 2 132. The disc 2 132 limits the screw 143 so that when the gear 2 142 rotates, it drives the screw 143 to move laterally. The screw 143 moves laterally and drives the movable plate 15 to move laterally.

[0039] Reference Figure 3 , two grab bars 151 are provided on one side of the movable plate 15 close to the storage plate 12, and the two grab bars 151 are respectively located at both ends of the movable plate 15, and the movable plate 15 moves laterally to drive the two grab bars 151 to move laterally. A driving member is provided between the two grab bars 151, and the driving member includes a two-way screw 2 153 and a driving block 154. The two-way screw 2 153 is located between the two grab bars 151, and the two-way screw 2 153 is set along the moving direction of the grab bars 151, and the two-way screw 2 153 is rotatably connected to the movable plate 15, and the two driving blocks 154 are located between the two-way screw 2 At both ends of 153, the driving block 154 is threadedly connected to the two-way lead screw 153, the driving block 154 corresponds to the grab rod 151 one by one, and the driving block 154 is fixedly connected to the corresponding grab rod 151. When the guide wheel group needs to be clamped, the driving block 154 is rotated, and the lead screw drives the two grab rods 151 to move in a direction approaching each other. An arc plate 152 is fixedly provided at one end of the grab rod 151 away from the movable plate 15. The movement of the grab rod 151 drives the arc plate 152 to move, so that the arc plate 152 cooperates to clamp the guide wheel group, which is conducive to improving the convenience of the rotary test tooling.

[0040] Reference Figure 3The upper end of the frame 1 is provided with a rotating assembly, which includes a motor 13, a disc 131, a disc 2 132, a belt 133 and a telescopic rod 134. The motor 13 is fixed to the upper end of the frame 1. The disc 131 is coaxially fixed with the output shaft of the motor 13. When the motor 13 is started, the disc 131 is driven to rotate. The disc 2 132 and the disc 131 are located in the same plane. The belt 133 is located between the disc 131 and the disc 2 132, and the disc 131 and the disc 2 132 are both connected to the belt 1. 33 rolling connection, the two telescopic rods 134 are located between the second disc 132 and the movable plate 15, and one end of the telescopic rod 134 is fixedly connected to the second disc 132, and the other end is fixedly connected to the movable plate 15. The rotation of the first disc 131 drives the belt 133 to rotate, the rotation of the belt 133 drives the second disc 132 to rotate, the rotation of the second disc 132 drives the telescopic rod 134 to rotate, and the rotation of the telescopic rod 134 drives the movable plate 15 to rotate, further realizing the rotation of the guide wheel group, which is conducive to improving the convenience of the rotary test tooling.

[0041] Reference Figure 4 , a detection device is fixedly provided at the upper end of the frame 1, the detection device includes a cylinder 2 16, a pressure plate 161, a pressure touch sensor 162 and an alarm 163. The cylinder 2 16 is fixedly provided at the upper end of the frame 1, the pressure plate 161 is fixedly provided at the output end of the cylinder 2 16, and the pressure plate 161 is connected to the frame 1 in a horizontal sliding direction, and the pressure plate 161 is located between the two movable plates 15. When the pressure plate 161 moves close to or away from the rotation axis of the movable plate 15, the cylinder 2 16 is started to drive the pressure plate 161 to move in the direction close to the guide wheel group, so that the pressure plate 161 contacts the guide wheel group, which is suitable for guide wheel groups of different sizes, which is conducive to improving the applicability of the rotation test tooling. The pressure sensor is fixedly provided on the pressure plate 161, and the pressure sensor senses the pressure on the pressure plate 161 at different positions of the outer edge of the guide wheel group. The alarm 163 is fixedly provided at the upper end of the frame 1, and the alarm 163 issues an alarm for abnormal force data, which is conducive to improving the intelligence of the rotation test tooling.

[0042] The implementation principle of a rotary test tooling of an embodiment of the present application is as follows: rolling the guide wheel group into the groove 121, starting cylinder 11, the lifting plate 111 rises, the baffle 112 abuts the guide wheel group, the storage plate 12 rises, the motor 13 starts, the arc plate 152 clamps the guide wheel group, the cylinder 2 16 starts to make the pressure plate 161 touch the outer edge of the guide wheel group, the motor 2 14 starts to drive the guide wheel group to rotate, the pressure sensor senses the pressure on the pressure plate 161 at different positions of the outer edge of the guide wheel group, the alarm 163 alarms for abnormal force data, and there is no need to lift the guide wheel group, which is conducive to improving the convenience of the rotary test tooling.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A rotary test fixture, comprising a frame (1), characterized in that: The upper end of the frame (1) is connected to a storage plate (12) in a vertical sliding manner. The storage plate (12) is used to place a guide wheel group. The lower end of the frame (1) is fixed with a cylinder (11). The cylinder (11) is used to drive the storage plate (12) to rise and fall. The upper end of the frame (1) is provided with two movable plates (15). The two movable plates (15) are respectively located on both sides of the storage plate (12). The movable plates (15) are arranged in a vertical direction. The movable plates (15) move back and forth in a direction close to or away from the storage plate (12). Two grab bars (151) are provided on the side of the movable plate (15) close to the storage plate (12). The two grab bars (151) are respectively located at the two ends of the movable plate (15), and a driving member is provided between the two grab bars (151), and the driving member is used to drive the two grab bars (151) to be slidably connected with the movable plate (15) in a direction of approaching or moving away from each other. An arc plate (152) is fixedly provided at one end of the grab bar (151) away from the movable plate (15), and the two arc plates (152) are used to clamp the guide wheel group. A rotating assembly is provided at the upper end of the frame (1), and the rotating assembly is used to drive the movable plate (15) to rotate. A detection device is fixedly provided at the upper end of the frame (1), and the detection device is used to detect the force condition of the guide wheel group.

2. The rotary test fixture according to claim 1, characterized in that: The upper end of the frame (1) is fixedly provided with a second motor (14), the output shaft of the second motor (14) is fixedly provided with a first gear (141), the lower end of the first gear (141) is rotatably connected with the second gear (142), and the second gear (142) is meshed with the first gear (141), the side of the movable plate (15) away from the grab bar (151) is rotatably connected with a screw rod (143), the screw rod (143) and the second gear (142) are fixed coaxially, and the screw rod (143) passes through the second gear (142) and is threadedly connected to the second gear (142), and the side of the screw rod (143) close to the second gear (142) is provided with a second disc (132), and the screw rod (143) is rotatably connected to the second disc (132).

3. The rotary test fixture according to claim 2, characterized in that: The rotating assembly comprises a motor (13), a disc (131), a disc (132), a belt (133) and a telescopic rod (134); the motor (13) is fixedly provided with the upper end of the frame (1); the disc (131) is coaxially fixed with the output shaft of the motor (13); the disc (132) and the disc (131) are located in the same plane; the belt (133) is located between the disc (131) and the disc (132); the disc (131) and the disc (132) are both rollingly connected to the belt (133); the two telescopic rods (134) are both located between the disc (132) and the movable plate (15); one end of the telescopic rod (134) is fixedly connected to the disc (132) and the other end is fixedly connected to the movable plate (15).

4. The rotary test fixture according to claim 1, characterized in that: The lower end of the storage plate (12) is vertically slidably connected to a lifting plate (111), the lifting plate (111) is fixedly connected to the output end of the cylinder (11), and a baffle (112) is slidably connected to the lifting plate (111). The two baffles (112) are respectively located on both sides of the lifting plate (111), and the two baffles (112) are slidably connected to the lifting plate (111) in a direction of approaching or moving away from each other. A bidirectional lead screw (113) is provided at the lower end of the baffle (112), and the bidirectional lead screw (113) is arranged along the sliding direction of the baffle (112). The two ends of the bidirectional lead screw (113) respectively pass through the two baffles (112) and are threadedly connected to the baffles (112), and the bidirectional lead screw (113) is rotatably connected to the lifting plate (111). A slot (124) is provided on the storage plate (12), and the baffle (112) passes through the slot (124) and abuts against the guide wheel group.

5. The rotary test fixture according to claim 4, characterized in that: The storage plate (12) is provided with a groove (121), and two limiting plates (123) are provided in the groove (121). The limiting plates (123) are connected to the storage plate (12) in a transverse sliding manner, and the moving direction of the limiting plates (123) is perpendicular to the moving direction of the baffle (112). An elastic member (122) is fixed between the limiting plate (123) and the inner wall of the groove (121), and the elastic member (122) is used to drive the two limiting plates (123) to move closer to each other.

6. The rotary test fixture according to claim 4, characterized in that: A rotating wheel (114) is provided at the upper end of the baffle (112). The rotating wheel (114) is located on a side where the two baffles (112) are close to each other and is connected to the baffle (112) in a vertical rotational direction.

7. The rotary test fixture according to claim 1, characterized in that: The detection device comprises a second cylinder (16), a pressure plate (161), a pressure sensor (162) and an alarm (163). The second cylinder (16) is fixedly mounted on the upper end of the frame (1). The pressure plate (161) is fixedly mounted on the output end of the second cylinder (16). The pressure plate (161) is connected to the frame (1) in a sliding manner in the horizontal direction. The pressure plate (161) is located between two movable plates (15). When the pressure plate (161) moves, it approaches or moves away from the rotation axis of the movable plate (15). The pressure sensor is fixedly mounted on the pressure plate (161) and is used to contact the outer edge of the guide wheel group and capture force data. The alarm (163) is fixedly mounted on the upper end of the frame (1) and is used to warn of abnormal guide wheel groups.

8. The rotary test fixture according to claim 1, characterized in that: The driving member includes a bidirectional lead screw 2 (153) and a driving block (154). The bidirectional lead screw 2 (153) is located between the two grab bars (151) and is arranged along the moving direction of the grab bars (151). The bidirectional lead screw 2 (153) is rotatably connected to the movable plate (15). The two driving blocks (154) are located at both ends of the bidirectional lead screw 2 (153). The driving blocks (154) are threadedly connected to the bidirectional lead screw 2 (153). The driving blocks (154) correspond to the grab bars (151) one by one, and the driving blocks (154) are fixedly connected to the corresponding grab bars (151).

Images