Polishing device for crankshaft machining

Abstract

The utility model relates to the technical field of crankshaft grinding equipment, in particular to a grinding device for crankshaft machining, which comprises a base and a supporting mechanism, the supporting mechanism is arranged above the base, a support is arranged on one side of the supporting mechanism, a plurality of grinding mechanisms are arranged on one side, close to the supporting mechanism, of the support, and the supporting mechanism comprises two supporting plates. The grinding mechanism comprises a first L-shaped plate, a second L-shaped plate is arranged at the upper end of the first L-shaped plate, a mounting block is arranged on the side, away from the support, of the first L-shaped plate, and a grinding belt is connected to one side of the mounting block. According to the grinding device, the mounting positions and the number of parts such as the first L-shaped plate, the second L-shaped plate and the grinding belt in the grinding mechanism can be adjusted according to actual use requirements, so that the grinding device is suitable for grinding operation of crankshafts of different models, and the application range of the grinding device is widened.

Description

Technical Field

[0001] This utility model relates to the technical field of crankshaft grinding equipment, and specifically discloses a grinding device for crankshaft processing. Background Technology

[0002] The crankshaft is one of the most important components of an engine. It bears the force transmitted from the connecting rod and converts it into torque, which is then output through the crankshaft to drive other accessories on the engine. The crankshaft is subjected to the combined effects of centrifugal force from the rotating mass, periodically changing gas inertial force, and reciprocating inertial force, which subject it to bending and torsional loads. Therefore, the crankshaft is required to have sufficient strength and rigidity. During the machining and use of the crankshaft, grinding equipment is used to grind the crankshaft to restore its geometric dimensions and accuracy, remove the wear layer on the crankshaft surface, extend the service life of the crankshaft, reduce friction during crankshaft operation, and improve the operating efficiency of the engine.

[0003] Chinese patent CN215036273U discloses a crankshaft grinding device, including a base with a machining groove. A motor is fixedly connected to the outer wall of the base, and a rotating shaft is connected to the output end of the motor. The rotating shaft extends outward through the side wall of the base and is fixedly connected to two gears. The gears are connected to a fixing mechanism. A connecting plate is fixedly connected to the upper surface of the base, and a grinding mechanism is provided on the connecting plate. The fixing mechanism includes an adjustment knob, and a threaded rod is fixedly connected to the side wall of the adjustment knob. A threaded hole is opened in the side wall of the base, and the threaded rod extends outward through the threaded hole and is rotatably connected to a fixing block. The fixing block has a fixing groove. This invention uses a fixing block, fixing groove, rubber layer, adjusting knob, threaded rod, etc. to fix the crankshaft, and then uses a slider, spring, grinding belt, connecting plate, etc. to grind multiple journals simultaneously, which improves grinding efficiency. However, the installation position and number of grinding mechanisms in the above-mentioned grinding device are inconvenient to adjust, making the above-mentioned grinding device unsuitable for grinding various types of crankshafts, which to some extent limits the scope of application of the above-mentioned grinding device. Therefore, in order to solve the above problems, this invention proposes a grinding device for crankshaft processing. Utility Model Content

[0004] The present invention aims to provide a grinding device for crankshaft processing, which can adjust the installation position and quantity of components such as the first L-shaped plate, the second L-shaped plate and the grinding belt in the grinding mechanism according to actual usage requirements, so that the grinding device is suitable for grinding operations of different models of crankshafts and improves the applicability of the grinding device.

[0005] This utility model is achieved through the following technical solution:

[0006] A grinding device for crankshaft machining includes a base and a support mechanism. The support mechanism is disposed above the base, and a bracket is disposed on one side of the support mechanism. Multiple grinding mechanisms are disposed on the side of the bracket near the support mechanism. The base includes a bearing plate, and first sliding grooves are symmetrically arranged at both ends of the bearing plate. The support mechanism includes two support plates, and a first slider is disposed at the lower center of each of the two support plates. A lead screw is disposed through the interior of the first slider, and the two first sliders are slidably connected to the two first sliding grooves respectively. A chuck is disposed on one side of the upper end of the support plate. Multiple rows of mounting holes arranged in a linear array are disposed inside the upper end of the bracket. The grinding mechanism includes a first L-shaped plate, and a second L-shaped plate is disposed on the upper end of the first L-shaped plate. Two first connecting holes are disposed on the end of the second L-shaped plate away from the first L-shaped plate. A mounting block is disposed on the side of the first L-shaped plate away from the bracket. A grinding belt is connected to one side of the mounting block. Multiple second connecting holes arranged in a linear array are opened on the side of the grinding belt away from the mounting block. A limit structure is connected between the second connecting holes and the first connecting holes.

[0007] As a further feature of the above solution, two support legs are provided on both sides of the lower part of the support plate to provide stable support for the support plate and the components above it. A storage box is provided at one end of the lower part of the support plate to facilitate the placement of accessories and parts in the grinding device for easy access by workers. A controller is provided on one side of the support plate to facilitate the control of the operation of relevant components in the grinding device.

[0008] As a further feature of the above solution, the lead screw is threadedly connected to the first slider, and a support seat is provided at one end of the first slide groove. The lead screw is rotatably connected to the support seat, and the rotation of the lead screw can drive the first slider to move in the first slide groove, thereby adjusting the positions of the two support plates and the three-jaw chuck to fix the crankshaft. A crank handle is connected to the end of the lead screw away from the support seat for easy gripping by the worker when rotating the lead screw. Both sides of the first slider are provided with locking blocks, and the lower end of the locking blocks is provided with locking grooves. The locking grooves and locking blocks are respectively engaged with the lead screw and the first slide groove. After the lead screw stops rotating, the friction between the locking blocks and the first slide groove, as well as the friction between the locking grooves and the lead screw, can fix the lead screw, preventing the lead screw from rotating during crankshaft grinding. A handle is provided above the locking blocks for easy gripping by the worker when picking up and putting down the locking blocks.

[0009] As a further feature of the above scheme, a support shaft is provided on one side of the three-jaw chuck. The support shaft passes through the interior of the support plate and is rotatably connected to the support plate. One end of the support shaft is connected to a motor, which can drive the three-jaw chuck and crankshaft to rotate. A base is connected to the outside of the motor, and the lower end of the base is connected to the support plate, which can provide stable support for the motor.

[0010] As a further feature of the above solution, the lower end of the bracket is connected to the bearing plate, which can provide stable support for the grinding mechanism. Two threaded rods are connected to the side of the first L-shaped plate near the bracket. The threaded rods pass through the interior of the first mounting hole. A washer is provided on the outside of the threaded rod. A first nut is provided on one side of the washer. The first nut is threadedly connected to the threaded rod, which facilitates the connection of the first L-shaped plate and its connecting parts to the bracket.

[0011] As a further feature of the above solution, a support block is connected to the upper end of the side of the first L-shaped plate away from the bracket. The lower part of the second L-shaped plate is detachably connected to the support block and the first L-shaped plate, which facilitates the assembly and maintenance of the above components. A second slider is connected to the side of the mounting block near the first L-shaped plate. The second slider is slidably connected to the second slide groove, which helps to limit the movement direction of the mounting block. Two springs are connected to the lower part of the mounting block. The lower end of the springs is connected to the first L-shaped plate. During the crankshaft grinding process, the springs can push the mounting block and the second slider upward through their rebound action, so that the grinding belt is always in contact with the crankshaft journal, thereby ensuring the grinding effect of the crankshaft journal.

[0012] As a further feature of the above solution, the limiting structure includes a first connecting plate. Two limiting rods are symmetrically connected to one side of the first connecting plate. The limiting rods pass through the interior of a second connecting hole. A second connecting plate is slidably connected to the outer sides of the two limiting rods. Two second nuts are provided on the side of the second connecting plate away from the grinding belt. The two second nuts are threadedly connected to the two limiting rods respectively. A limiting shaft is provided at the end of the limiting rod away from the first connecting plate. The limiting shaft passes through the interior of the first connecting hole. A third nut is threadedly connected to the outer side of the limiting shaft, which can fix the end of the grinding belt away from the mounting block.

[0013] The present invention has the following beneficial effects during use:

[0014] The storage box in the base facilitates the placement of accessories and parts in the grinding device, making them easily accessible to workers. The combination of the lead screw and the first slider in the support mechanism allows the first slider to slide in the first groove through the rotation of the lead screw, thereby adjusting the distance between the two support plates and the three-jaw chuck. This allows the two ends of the crankshaft to be fixed between the three-jaw chuck. The design of the locking block and the slot below it allows the lead screw to be fixed after it stops rotating, through the friction between the locking block and the first groove, as well as the friction between the slot and the lead screw. This prevents the lead screw from rotating during crankshaft grinding, thus keeping the support plates stable during crankshaft grinding.

[0015] The combination of two threaded rods on one side of the first L-shaped plate in the grinding mechanism and multiple rows of linearly arrayed mounting holes on the upper end of the bracket facilitates the adjustment of the number and installation position of the grinding mechanism according to actual usage requirements. This makes the grinding device suitable for grinding various types of crankshafts, thus expanding its applicability. The combination of the mounting block, slider, and spring can limit the movement direction of the mounting block during crankshaft rotation grinding, and through the spring's rebound energy, ensures that the grinding belt is always in contact with the crankshaft journal, thereby guaranteeing the grinding effect of the crankshaft. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a first perspective view of the present invention;

[0018] Figure 2 This is a second perspective view of the present invention;

[0019] Figure 3 This is a perspective view of the support plate in this utility model;

[0020] Figure 4 This is a perspective view of the card block in this utility model;

[0021] Figure 5 This is a perspective view of the grinding mechanism in this utility model;

[0022] Figure 6 This is a perspective view of the first L-shaped plate in this utility model;

[0023] Figure 7 This is a perspective view of the second L-shaped plate in this utility model;

[0024] Figure 8 This is a perspective view of the mounting block in this utility model.

[0025] In the diagram: 1. Base; 2. Support mechanism; 3. Bracket; 4. Grinding mechanism; 5. Controller; 11. Bearing plate; 111. First slide groove; 112. Support seat; 12. Support leg; 13. Storage box; 21. Support plate; 211. First slider; 22. Lead screw; 221. Crank handle; 23. Locking block; 231. Handle; 232. Slot; 24. Three-jaw chuck; 241. Support shaft; 25. Motor; 26. Base; 31. Mounting hole; 41. First L-shaped... Plate; 411, Second slide groove; 42, Support block; 43, Threaded rod; 431, Washer; 432, First nut; 44, Second L-shaped plate; 441, First connecting hole; 45, Mounting block; 451, Second slider; 46, Spring; 47, Grinding belt; 471, Second connecting hole; 48, Limiting structure; 481, First connecting plate; 482, Limiting rod; 4821, Limiting shaft; 483, Second connecting plate; 484, Second nut; 485, Third nut. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-8 This application will be described in detail with reference to the embodiments.

[0028] An embodiment discloses a grinding device for crankshaft machining, including a base 1 and a support mechanism 2. The support mechanism 2 is disposed above the base 1, and a bracket 3 is disposed on one side of the support mechanism 2. A plurality of grinding mechanisms 4 are disposed on the side of the bracket 3 near the support mechanism 2. The base 1 includes a bearing plate 11, and the bearing plate 11 has first sliding grooves 111 symmetrically arranged at both ends inside. The support mechanism 2 includes two support plates 21, and a first slider 211 is disposed at the lower center of each of the two support plates 21. A lead screw 22 is disposed through the interior of the first slider 211. The two first sliders 211 are slidably connected to the two first sliding grooves 111 respectively. The support plate 21... A chuck is provided on one side of the upper end. The upper end of the bracket 3 is provided with multiple rows of mounting holes 31 arranged in a linear array. The grinding mechanism 4 includes a first L-shaped plate 41. A second L-shaped plate 44 is provided on the upper end of the first L-shaped plate 41. Two first connecting holes 441 are provided on the end of the second L-shaped plate 44 away from the first L-shaped plate 41. A mounting block 45 is provided on the side of the first L-shaped plate 41 away from the bracket 3. A grinding belt 47 is connected to one side of the mounting block 45. Multiple second connecting holes 471 arranged in a linear array are opened on the side of the grinding belt 47 away from the mounting block 45. A limit structure 48 is connected between the second connecting holes 471 and the first connecting holes 441.

[0029] like Figure 1 and Figure 2 As shown, two support legs 12 are provided on both sides of the lower part of the support plate 11, which can provide stable support for the support plate 11 and the components above it. A storage box 13 is provided at one lower end of the support plate 11, which is convenient for placing accessories and parts in the grinding device and for workers to access them. A controller 5 is provided on one side of the support plate 11 to facilitate the control of the operation of relevant components in the grinding device.

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the lead screw 22 is threadedly connected to the first slider 211. A support base 112 is provided at one end of the first slide groove 111. The lead screw 22 is rotatably connected to the support base 112, allowing the first slider 211 to move within the first slide groove 111 through rotation of the lead screw 22. This adjusts the positions of the two support plates 21 and the three-jaw chuck 24 to fix the crankshaft. A crank handle 221 is connected to the end of the lead screw 22 away from the support base 112 for easy gripping by the worker when rotating the lead screw 22. The first slider... Both sides of 211 are provided with locking blocks 23. The lower end of the locking block 23 is provided with a locking groove 232. The locking groove 232 and the locking block 23 are respectively engaged with the lead screw 22 and the first slide groove 111. After the lead screw 22 stops rotating, the friction between the locking block 23 and the first slide groove 111 and the friction between the locking groove 232 and the lead screw 22 will fix the lead screw 22, preventing the lead screw 22 from rotating during the crankshaft grinding process. The top of the locking block 23 is provided with a handle 231 for easy gripping by workers when picking up and putting down the locking block 23.

[0031] like Figure 1 and Figure 2 As shown, a support shaft 241 is provided on one side of the three-jaw chuck 24. The support shaft 241 passes through the interior of the support plate 21 and is rotatably connected to the support plate 21. One end of the support shaft 241 is connected to a motor 25, which can drive the three-jaw chuck 24 and the crankshaft to rotate. The outer side of the motor 25 is connected to a base 26. The lower end of the base 26 is connected to the support plate 21, which can provide stable support for the motor 25.

[0032] like Figure 1 , Figure 2 and Figure 5 As shown, the lower end of the bracket 3 is connected to the bearing plate 11, which can provide stable support for the grinding mechanism 4. Two threaded rods 43 are connected to the side of the first L-shaped plate 41 near the bracket 3. The threaded rods 43 pass through the interior of the first mounting hole 31. A washer 431 is provided on the outside of the threaded rod 43. A first nut 432 is provided on one side of the washer 431. The first nut 432 is threadedly connected to the threaded rod 43, which facilitates the connection of the first L-shaped plate 41 and its connecting parts to the bracket 3.

[0033] like Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, a support block 42 is connected to the upper end of the first L-shaped plate 41 on the side away from the bracket 3. The lower part of the second L-shaped plate 44 is detachably connected to the support block 42 and the first L-shaped plate 41, which facilitates the assembly and maintenance of the above components. A second slider 451 is connected to the side of the mounting block 45 near the first L-shaped plate 41. The second slider 451 is slidably connected to the second slide groove 411, which helps to limit the movement direction of the mounting block 45. Two springs 46 are connected to the lower part of the mounting block 45. The lower end of the springs 46 is connected to the first L-shaped plate 41. During the crankshaft grinding process, the springs 46 can push the mounting block 45 and the second slider 451 upward by their rebound action, so that the grinding belt 47 is always in contact with the crankshaft journal, thereby ensuring the grinding effect of the crankshaft journal.

[0034] like Figure 5 As shown, the limiting structure 48 includes a first connecting plate 481. Two limiting rods 482 are symmetrically connected to one side of the first connecting plate 481. The limiting rods 482 pass through the interior of the second connecting hole 471. A second connecting plate 483 is slidably connected to the outer side of the two limiting rods 482. Two second nuts 484 are provided on the side of the second connecting plate 483 away from the grinding belt 47. The two second nuts 484 are threadedly connected to the two limiting rods 482 respectively. A limiting shaft 4821 is provided at the end of the limiting rod 482 away from the first connecting plate 481. The limiting shaft 4821 passes through the interior of the first connecting hole 441. A third nut 485 is threadedly connected to the outer side of the limiting shaft 4821, which can fix the end of the grinding belt 47 away from the mounting block 45.

[0035] Before use, the crankshaft grinding device disclosed in this embodiment determines the number and installation position of the grinding mechanisms 4 according to the model and number of journals of the crankshaft to be ground. Two threaded rods 43 in the grinding mechanism 4 are passed sequentially through two adjacent mounting holes 31. A washer 431 is placed on the outside of the threaded rod 43, and the first nut 432 is tightened to fix the position of the grinding mechanism 4. One end of the crankshaft to be ground is then passed sequentially through the closed loop formed by the grinding belts 47, the limiting structure 48, the second L-shaped plate 44, and the support block 42 in the multiple grinding mechanisms 4. The lower inner ends of the multiple grinding belts 47 are sequentially pressed against the outer sides of the journals between two adjacent cranks. The handles 2 above the locking blocks 23 on both sides of the two first sliders 211 are then grasped sequentially. 31. Pull the locking block 23 out of the first slide groove 111, separating the locking groove 232 from the lead screw 22, releasing the fixation on the lead screw 22. Grasp the crank handle 221 at one end of the two lead screws 22 in sequence and rotate the lead screw 22 to make the first slider 211 slide in the first slide groove 111. Adjust the distance between the two support plates 21 and the three-jaw chuck 24 to a distance at which the two three-jaw chucks 24 can clamp and fix the two ends of the crankshaft respectively. Stop rotating the lead screw 22 and reset the four locking blocks 23 in sequence, restoring the connection between the locking block 23 and the first slide groove 111, and restoring the connection between the locking groove 232 and the lead screw 22, so that the locking block 23 is in contact with the opposite side of the first slide groove 111, fixing the positions of the lead screw 22, the first slider 211, the support plate 21, and the three-jaw chuck 24.

[0036] Fix both ends of the crankshaft in the jaws of the two three-jaw chucks 24 respectively. Unscrew the third nuts 485 in the multiple grinding mechanisms 4 in sequence and set them aside. Pull the limiting shaft 4821 out of the first connecting hole 441. Unscrew the second nuts 484 in the multiple limiting structures 48 from the outside of the limiting rod 482 in sequence. Pull the limiting rod 482 out of the inside of the second connecting plate 483. Pull the limiting rod 482 out of the second connecting hole 471 to adjust the second connecting hole 471 connected to the limiting rod 482 in the limiting structure 48. When grinding the same model of crankshaft, it is only necessary to adjust the second connecting hole 471 connected to the limiting rod 482 in the limiting structure 48 once, so that the inner side of the grinding belt 47 in each grinding mechanism 4 is not subjected to any pressure on the spring 46. When compressed to the limit of spring 46, the crankshaft can fit against the journal. The second connecting plate 483, the second nut 484 and the third nut 485 in the limiting mechanism are reset in sequence. The controller 5 is used to start the motor 25, which drives the three-jaw chuck 24 and the crankshaft to rotate. During the rotation of the crankshaft, the second slider 451 slides back and forth in the second slide groove 411. Each journal rubs against the inner side of multiple grinding belts 47 to grind the journal of the crankshaft. After grinding, the motor 25 is turned off, and the two ends of the crankshaft are separated from the two three-jaw chucks 24 respectively. After the crankshaft is pulled out from the closed loop formed by the grinding belts 47, the limiting structure 48, the second L-shaped plate 44 and the support block 42 in the multiple grinding mechanisms 4, the above operation is repeated to continue the grinding operation of the crankshaft.

[0037] The crankshaft grinding device disclosed in this utility model includes a controller 5, a bearing plate 11, a first slide groove 111, a support seat 112, a support leg 12, a storage box 13, a support plate 21, a first slider 211, a lead screw 22, a crank handle 221, a locking block 23, a locking groove 232, a three-jaw chuck 24, a support shaft 241, a motor 25, a machine base 26, a mounting hole 31, a second slide groove 411, a support block 42, a threaded rod 43, a washer 431, a first nut 432, a mounting block 45, a second slider 451, a spring 46, a grinding belt 47, a first connecting plate 481, a limiting rod 482, a limiting shaft 4821, a second connecting plate 483, a second nut 484, and a third nut 485. These components are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0038] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grinding device for crankshaft machining, comprising a base and a support mechanism, characterized in that: A support mechanism is provided above the base, and a bracket is provided on one side of the support mechanism. Multiple grinding mechanisms are provided on the side of the bracket near the support mechanism. The base includes a bearing plate, and first sliding grooves are symmetrically arranged at both ends of the bearing plate. The support mechanism includes two support plates, and a first slider is provided at the lower center of each of the two support plates. A lead screw is provided through the interior of the first slider, and the two first sliders are slidably connected to the two first sliding grooves respectively. A chuck is provided on one side of the upper end of the support plate. Multiple rows of mounting holes are arranged in a linear array inside the upper end of the bracket. The grinding mechanism includes a first L-shaped plate, and a second L-shaped plate is provided on the upper end of the first L-shaped plate. Two first connecting holes are provided on the end of the second L-shaped plate away from the first L-shaped plate. A mounting block is provided on the side of the first L-shaped plate away from the bracket. A grinding belt is connected to one side of the mounting block. Multiple second connecting holes are arranged in a linear array on the side of the grinding belt away from the mounting block. A limit structure is connected between the second connecting holes and the first connecting holes.

2. The grinding device for crankshaft machining according to claim 1, characterized in that: Two support legs are provided on both sides of the lower part of the support plate, a storage box is provided at one end of the lower part of the support plate, and a controller is provided on one side of the support plate.

3. The grinding device for crankshaft machining according to claim 1, characterized in that: The lead screw is threadedly connected to the first slider. A support seat is provided at one end of the first slide groove. The lead screw is rotatably connected to the support seat. A crank is connected to the end of the lead screw away from the support seat. A locking block is provided on both sides of the first slider. A locking groove is provided at the lower end of the locking block. The locking groove and the locking block are respectively engaged with the lead screw and the first slide groove. A handle is provided above the locking block.

4. The grinding device for crankshaft machining according to claim 1, characterized in that: A support shaft is provided on one side of the three-jaw chuck. The support shaft passes through the interior of the support plate and is rotatably connected to the support plate. One end of the support shaft is connected to a motor. A base is connected to the outside of the motor. The lower end of the base is connected to the support plate.

5. A grinding device for crankshaft machining according to claim 1, characterized in that: The lower end of the bracket is connected to the bearing plate. Two threaded rods are connected to the side of the first L-shaped plate near the bracket. The threaded rods pass through the interior of the first mounting hole. A washer is provided on the outside of the threaded rod. A first nut is provided on one side of the washer. The first nut is threadedly connected to the threaded rod.

6. The grinding device for crankshaft machining according to claim 1, characterized in that: A support block is connected to the upper end of the side of the first L-shaped plate away from the bracket. The lower part of the second L-shaped plate is detachably connected to the support block and the first L-shaped plate. A second slider is connected to the side of the mounting block near the first L-shaped plate. The second slider is slidably connected to the second slide groove. Two springs are connected to the lower part of the mounting block. The lower end of the springs is connected to the first L-shaped plate.

7. A grinding device for crankshaft machining according to claim 1, characterized in that: The limiting structure includes a first connecting plate, on one side of which two limiting rods are symmetrically connected. The limiting rods pass through the interior of a second connecting hole. The outer sides of the two limiting rods are slidably connected to a second connecting plate. On the side of the second connecting plate away from the grinding belt, two second nuts are provided. The two second nuts are threadedly connected to the two limiting rods respectively. A limiting shaft is provided at the end of the limiting rod away from the first connecting plate. The limiting shaft passes through the interior of the first connecting hole. The outer side of the limiting shaft is threadedly connected to a third nut.

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