A rear overhang positioning tool

Abstract

The utility model discloses a kind of rear cantilever positioning tool, it includes bearing mechanism, X direction positioning mechanism, Y direction positioning mechanism and pressing mechanism, the bearing mechanism has a bearing surface, the bearing surface is used to place rear cantilever;The X direction positioning mechanism includes first X direction positioning piece and second X direction positioning piece, the first X direction positioning piece and the second X direction positioning piece are respectively arranged at the two ends of rear cantilever length direction, and are respectively used to resist the two ends of rear cantilever;The Y direction positioning mechanism includes two first Y direction positioning components, two the first Y direction positioning components are respectively arranged at the two sides of rear cantilever width direction, and are respectively used to resist the two sides of rear cantilever.The beneficial effects of the utility model are: the rear cantilever positioning tool of the present application is suitable for clamping and positioning the rear cantilever of the present long rod structure, can effectively clamp and position the rear cantilever of the present long rod structure, avoid the situation that clamping is not in place.

Description

Technical Field

[0001] This utility model relates to the field of rear cantilever machining technology, and in particular to a rear cantilever positioning fixture. Background Technology

[0002] The suspension is a crucial assembly in a car, elastically connecting the chassis and wheels, and affecting various aspects of the vehicle's performance. The rear suspension arm plays a vital role in load-bearing and stress-relieving during suspension operation and vehicle movement. Existing rear suspension systems, such as... Figure 1 As shown, the rear suspension 100 has a ring portion 110, a rod portion 120, and a fork portion 130 that are fixedly connected in sequence. When machining the rear suspension with the above structure, a positioning fixture is required to clamp and position the rear suspension to ensure that it does not move. Since the rear suspension with the above structure is a long rod-shaped structure, existing rear suspension positioning fixtures (such as the center positioning clamping mechanism for automotive rear suspensions disclosed in application number 202122168585.6) are only suitable for clamping and positioning disc-shaped rear suspensions, and not for clamping and positioning the aforementioned long rod-shaped rear suspension. If existing rear suspension positioning fixtures are used to clamp and position the aforementioned long rod-shaped rear suspension, improper clamping may easily occur. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a rear cantilever positioning fixture to solve the technical problem that the existing rear cantilever positioning fixture is not suitable for clamping and positioning the above-mentioned long rod-shaped rear cantilever and is prone to failure to be clamped in place.

[0004] To achieve the above technical objectives, the present invention provides a rear cantilever positioning fixture, comprising: A load-bearing mechanism having a load-bearing surface for mounting a rear cantilever; The X-axis positioning mechanism includes a first X-axis positioning member and a second X-axis positioning member. The first X-axis positioning member and the second X-axis positioning member are respectively disposed at both ends of the rear cantilever in the length direction and are respectively used to abut against both ends of the rear cantilever. The Y-axis positioning mechanism includes two first Y-axis positioning components, which are respectively disposed on both sides of the rear cantilever in the width direction and are respectively used to abut against both sides of the rear cantilever. A clamping mechanism, used to clamp or release the rear cantilever.

[0005] Furthermore, the bearing mechanism includes a platform, a fixed seat, a movable seat, and a pad. The fixed seat is fixedly connected to the platform, and the movable seat is detachably connected to the platform. The movable seat has a fastened state that is securely fastened to the platform and an adjustable state that can reciprocate linearly on the platform to adjust the distance between the movable seat and the fixed seat. The pad is detachably fixedly connected to the movable seat, and the top of the pad forms the bearing surface. The first X-axis positioning member is fixedly connected to the fixed seat, and the second X-axis positioning member is fixedly connected to the movable seat.

[0006] Furthermore, the first X-axis positioning element is a positioning groove with a V-shaped longitudinal section, which is used to clamp the annular part of the rear cantilever.

[0007] Furthermore, the second X-axis positioning element is a positioning pin, which is vertically arranged and used to abut against the fork portion of the rear cantilever.

[0008] Furthermore, both of the first Y-axis positioning components are close to the fork portion of the rear cantilever. The Y-axis positioning mechanism also includes two second Y-axis positioning components. The two second Y-axis positioning components are respectively disposed on both sides of the width direction of the rear cantilever, both close to the ring portion of the rear cantilever. The two second Y-axis positioning components are respectively used to abut against both sides of the rear cantilever.

[0009] Furthermore, both of the first Y-axis positioning components include a retaining block and an adjusting member. The bottom of the retaining block is slidably connected to the movable seat, and the adjusting member is connected to the retaining block for driving the retaining block closer to or away from the rear cantilever, so that the retaining block abuts or releases the rod portion of the rear cantilever.

[0010] Furthermore, the movable seat is provided with a first screw hole, the adjusting component is a first screw rod, the first screw rod is horizontally arranged and passes through the first screw hole, the first screw rod is threadedly connected to the first screw hole, and the end of the first screw rod near the abutment block is fixedly connected to the abutment block.

[0011] Furthermore, both second Y-axis positioning components are disposed between the fixed seat and the movable seat. Both second Y-axis positioning components include a support seat and a clamping member. The bottom of the support seat is fixedly connected to the platform, and the clamping member is detachably connected to the support seat and is used to clamp the rod part of the rear cantilever.

[0012] Furthermore, a second screw hole is provided on the top of the support base, and the clamping member is a second screw rod. The second screw rod is horizontally arranged and passes through the second screw hole. The second screw rod is threadedly connected to the second screw hole, and the end of the second screw rod near the rear cantilever is used to clamp the rod body of the rear cantilever.

[0013] Furthermore, the clamping mechanism includes two clamping rods, which are respectively disposed on both sides of the rear cantilever in the width direction. One end of each clamping rod is detachably connected to the movable seat, and the other end of each clamping rod is used to clamp or release the fork portion of the rear cantilever.

[0014] Compared with the prior art, the beneficial effects of this utility model include: In use, the rear cantilever is placed on the bearing surface of the bearing mechanism. The first X-direction positioning member and the second X-direction positioning member can respectively abut against the two ends of the rear cantilever, thereby positioning the rear cantilever in the X direction, that is, positioning the length direction of the rear cantilever. Then, the two first Y-direction positioning components can respectively abut against the two sides of the rear cantilever, thereby positioning the rear cantilever in the Y direction, that is, positioning the width direction of the rear cantilever. Then, the clamping mechanism clamps the rear cantilever, thereby positioning the rear cantilever in the Z direction. This rear cantilever positioning fixture is suitable for clamping and positioning the rear cantilever of this long rod-shaped structure, and can effectively clamp and position the rear cantilever of this long rod-shaped structure, avoiding the situation of incomplete clamping. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of an existing rear cantilever arm; Figure 2 This is a three-dimensional structural schematic diagram of a rear cantilever positioning fixture provided by this utility model; Figure 3 This is a three-dimensional structural diagram of a rear cantilever positioning fixture provided by this utility model, omitting the platform; In the diagram: 100 - rear cantilever, 110 - ring body, 120 - rod body, 130 - fork body, 200 - load-bearing mechanism, 210 - platform, 211 - slide groove, 220 - fixed seat, 230 - movable seat, 240 - pad block, 300 - X-axis positioning mechanism, 310 - first X-axis positioning component, 320 - second X-axis positioning component, 330 - third X-axis positioning component, 400 - Y-axis positioning mechanism, 410 - first Y-axis positioning assembly, 411 - clamping block, 412 - adjusting component, 420 - second Y-axis positioning assembly, 421 - support seat, 422 - clamping component, 500 - pressing mechanism, 510 - pressing rod. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0017] This utility model provides a rear cantilever positioning fixture, the structure of which is as follows: Figure 2 - Figure 3 As shown, the device includes a bearing mechanism 200, an X-axis positioning mechanism 300, a Y-axis positioning mechanism 400, and a clamping mechanism 500. The bearing mechanism 200 has a bearing surface for placing the rear cantilever 100. The X-axis positioning mechanism 300 includes a first X-axis positioning member 310 and a second X-axis positioning member 320, which are respectively disposed at both ends of the rear cantilever 100 in the length direction and are respectively used to abut against both ends of the rear cantilever 100. The Y-axis positioning mechanism 400 includes two first Y-axis positioning components 410, which are respectively disposed on both sides of the rear cantilever 100 in the width direction and are respectively used to abut against both sides of the rear cantilever 100. The clamping mechanism 500 is used to clamp or release the rear cantilever 100.

[0018] In use, the rear cantilever 100 is placed on the bearing surface of the bearing mechanism 200. The first X-direction positioning member 310 and the second X-direction positioning member 320 can respectively abut against the two ends of the rear cantilever 100, thereby positioning the rear cantilever 100 in the X direction, that is, positioning the rear cantilever 100 in the length direction. Then, the two first Y-direction positioning components 410 can respectively abut against the two sides of the rear cantilever 100, thereby positioning the rear cantilever 100 in the Y direction, that is, positioning the rear cantilever 100 in the width direction. Then, the clamping mechanism 500 clamps the rear cantilever 100, thereby positioning the rear cantilever 100 in the Z direction. This rear cantilever positioning fixture is suitable for clamping and positioning the rear cantilever 100 of this long rod-shaped structure, and can effectively clamp and position the rear cantilever 100 of this long rod-shaped structure, avoiding the situation of incomplete clamping.

[0019] As a preferred embodiment, please refer to Figure 2 and Figure 3The supporting mechanism 200 includes a platform 210, a fixed seat 220, a movable seat 230, and a pad 240. The fixed seat 220 is fixedly connected to the platform 210, and the movable seat 230 is detachably connected to the platform 210. The movable seat 230 has a fixed state that is fastened to the platform 210 and an adjustable state that can reciprocate linearly on the platform 210 to adjust the distance between the movable seat 230 and the fixed seat 220. The pad 240 is detachably fixedly connected to the movable seat 230. The top of the bearing surface is formed. The first X-direction positioning member 310 is fixedly connected to the fixed seat 220, and the second X-direction positioning member 320 is fixedly connected to the movable seat 230. In use, the distance between the movable seat 230 and the fixed seat 220 can be flexibly adjusted according to the actual length of the rear cantilever 100, so that the first X-direction positioning member 310 and the second X-direction positioning member 320 can respectively abut against the two ends of the rear cantilever 100. This rear cantilever positioning fixture can be used to clamp and position rear cantilever 100 of different lengths of this structure.

[0020] As a preferred embodiment, please refer to Figure 2 The platform 210 is provided with at least one sliding groove 211, and each sliding groove 211 is parallel to each other. The bottom of the movable seat 230 is slidably connected to the sliding groove 211, and the movement of the movable seat 230 can be guided by the sliding groove 211.

[0021] As a preferred embodiment, please refer to Figure 2 and Figure 3 The bottom of the movable seat 230 is fastened to the platform 210 by bolts. The movable seat 230 and the platform 210 can be connected or separated by loosening or tightening the bolts.

[0022] As a preferred embodiment, please refer to Figure 3 The first X-direction positioning member 310 is a positioning groove with a V-shaped longitudinal section, which is used to clamp the annular part 110 of the rear cantilever 100. This allows the positioning groove to clamp and position the annular part 110 of the rear cantilever 100 with different diameters. Since the pad 240 is small in volume, it can only support the fork part 130 of the rear cantilever 100. The positioning groove can also support the annular part 110 of the rear cantilever 100, thereby improving the support effect of the rear cantilever 100.

[0023] In a preferred embodiment, the pad 240 has various thicknesses, and the pads 240 of different thicknesses are matched with rear cantilever arms 100 of different lengths. When clamping the rear cantilever arm 100, the ring part 110 of the rear cantilever arm 100 is first inserted into the positioning groove, and then the pad 240 of a suitable thickness is selected. After the pad 240 of the corresponding thickness is detachably and fixedly connected to the movable seat 230, the fork part 130 of the rear cantilever arm 100 can be supported by the pad 240, so that the rear cantilever arm 100 can be kept in a horizontal state. As a preferred embodiment, please refer to Figure 3 The second X-direction positioning member 320 is a positioning pin. The positioning pin is set vertically and is used to abut against the fork part 130 of the rear cantilever 100. The positioning pin cooperates with the positioning groove to realize the positioning of the rear cantilever 100 in the X direction, that is, to position the rear cantilever 100 in the length direction.

[0024] As a preferred embodiment, please refer to Figure 2 and Figure 3 The X-axis positioning mechanism 300 further includes a third X-axis positioning member 330, which is disposed at one end of the rear cantilever 100 in the length direction and is fixedly and detachably connected to the movable seat 230. The third X-axis positioning member 330 is used to abut against the fork portion 130 of the rear cantilever 100, which can enhance the abutment effect on the rear cantilever 100 in the length direction.

[0025] As a preferred embodiment, please refer to Figure 3 The third X-axis positioning member 330 is a positioning seat. The positioning seat is fastened to the movable seat 230 by bolts. When the bolts are loosened or tightened, the distance between the positioning seat and the fork part 130 of the rear cantilever 100 can be adjusted to tighten or loosen the fork part 130 of the rear cantilever 100. It is also applicable to tightening or loosening rear cantilever 100 of different lengths.

[0026] As a preferred embodiment, please refer to Figure 2 and Figure 3 Both first Y-direction positioning components 410 are close to the fork portion 130 of the rear cantilever 100. The Y-direction positioning mechanism 400 also includes two second Y-direction positioning components 420. The two second Y-direction positioning components 420 are respectively disposed on both sides of the rear cantilever 100 in the width direction and are close to the ring portion 110 of the rear cantilever 100. The two second Y-direction positioning components 420 are respectively used to abut against both sides of the rear cantilever 100. By positioning one end of the rear cantilever 100 in the Y direction with the two first Y-direction positioning components 410 and positioning the other end of the rear cantilever 100 in the Y direction with the two second Y-direction positioning components 420, the positioning effect of the rear cantilever 100 in the Y direction can be improved.

[0027] As a preferred embodiment, please refer to Figure 2 and Figure 3 Both of the first Y-axis positioning components 410 include a retaining block 411 and an adjusting member 412. The bottom of the retaining block 411 is slidably connected to the movable seat 230. The adjusting member 412 is connected to the retaining block 411 and is used to drive the retaining block 411 closer to or away from the rear cantilever 100 so that the retaining block 411 presses against or releases the rod portion 120 of the rear cantilever 100. By manipulating the adjusting member 412, the adjusting member 412 can drive the retaining block 411 closer to or away from the rear cantilever 100, thereby causing the retaining block 411 to press against or release the rod portion 120 of the rear cantilever 100.

[0028] In a preferred embodiment, the bearing mechanism 200 further includes two slide rails, both of which are horizontally arranged along the width direction of the rear cantilever 100 and are fixedly connected to the movable seat 230. The bottoms of the two abutting blocks 411 are slidably connected to the two slide rails respectively, and the movement of the two movable seats 230 can be guided by the two slide rails.

[0029] As a preferred embodiment, please refer to Figure 3 The movable seat 230 has a first screw hole, and the adjusting member 412 is a first screw. The first screw is horizontally arranged and passes through the first screw hole. The first screw is threadedly connected to the first screw hole, and the end of the first screw near the abutment block 411 is fixedly connected to the abutment block 411. By rotating the first screw in the forward or reverse direction, since the first screw is threadedly connected to the first screw hole on the movable seat 230, and the abutment block 411 is guided and restricted by the slide rail, the abutment block 411 can move closer to or away from the rear cantilever 100.

[0030] As a preferred embodiment, please refer to Figure 2 and Figure 3 Both second Y-axis positioning components 420 are disposed between the fixed seat 220 and the movable seat 230. Both second Y-axis positioning components 420 include a support seat 421 and a clamping member 422. The bottom of the support seat 421 is fixedly connected to the platform 210. The clamping member 422 is detachably connected to the support seat 421 and is used to clamp the rod body 120 of the rear cantilever 100. By operating the clamping member 422, the clamping member 422 can clamp or release the rod body 120 of the rear cantilever 100.

[0031] As a preferred embodiment, please refer to Figure 3The support base 421 has a second screw hole at its top. The clamping member 422 is a second screw rod. The second screw rod is horizontally arranged and passes through the second screw hole. The second screw rod is threadedly connected to the second screw hole. The end of the second screw rod near the rear cantilever 100 is used to clamp the rod body 120 of the rear cantilever 100. By rotating the second screw rod in the forward or reverse direction, since the second screw rod is threadedly connected to the second screw hole on the support base 421, when the second screw rod rotates in the forward or reverse direction, the second screw rod will move closer to or away from the rear cantilever 100.

[0032] As a preferred embodiment, please refer to Figure 3 The clamping mechanism 500 includes two clamping rods 510, which are respectively disposed on both sides of the rear cantilever 100 in the width direction. One end of each clamping rod 510 is detachably connected to the movable seat 230, and the other end of each clamping rod 510 is used to clamp or release the fork portion 130 of the rear cantilever 100. By operating the two clamping rods 510, the two clamping rods 510 can clamp or release the fork portion 130 of the rear cantilever 100.

[0033] As a preferred embodiment, please refer to Figure 3 The clamping rod 510 is fastened to the movable seat 230 by bolts. When the bolts are loosened or tightened, the height of the clamping rod 510 can be adjusted to clamp or loosen the fork part 130 of the rear cantilever 100.

[0034] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of the technical solution of this utility model will be described in detail below: When clamping the rear cantilever 100, first insert the annular portion 110 of the rear cantilever 100 into the positioning groove. Then, select a pad 240 of appropriate thickness and detachably fix the pad 240 to the movable seat 230. The pad 240 can then support the fork portion 130 of the rear cantilever 100, allowing the rear cantilever 100 to remain horizontal. At this time, the positioning groove clamps the annular portion 110 of the rear cantilever 100, and the positioning pin abuts against the fork portion 130 of the rear cantilever 100, thereby supporting the rear cantilever 100. The rear cantilever 100 is positioned in the X direction, that is, in the length direction of the rear cantilever 100. Then, the bolts on the positioning seat are tightened. When the bolts are loosened, the positioning seat can be brought closer to the fork portion 130 of the rear cantilever 100 until the positioning seat abuts against the fork portion 130 of the rear cantilever 100, which strengthens the abutment effect in the length direction of the rear cantilever 100. Then, by rotating the first screw in the forward direction, since the first screw is threadedly connected to the first screw hole on the movable seat 230, and the abutment block 411 is subjected to the sliding... The guide rail has a guiding and limiting function. When the first screw is rotated in the forward direction, the clamping block 411 can move closer to the rear cantilever 100 until the clamping block 411 abuts against the fork portion 130 of the rear cantilever 100. Then, by rotating the second screw in the forward direction, since the second screw is threadedly connected to the second screw hole on the support base 421, when the second screw moves in the forward direction, the second screw will move closer to the rear cantilever 100 until the end of the second screw abuts against the rod portion 120 of the rear cantilever 100, thereby affecting the Y-axis of the rear cantilever 100. Positioning is performed in the Z direction, that is, positioning the rear cantilever 100 in the width direction. Then, the bolts on the clamping rod 510 are tightened. When the bolts are tightened, the height of the clamping rod 510 can be lowered until the clamping rod 510 presses against the fork portion 130 of the rear cantilever 100, thereby positioning the rear cantilever 100 in the Z direction. This rear cantilever positioning fixture is suitable for clamping and positioning the rear cantilever 100 of this long rod structure. It can effectively clamp and position the rear cantilever 100 of this long rod structure and avoid the situation of incomplete clamping.

[0035] The rear cantilever positioning fixture provided by this utility model has the following beneficial effects: (1) The distance between the movable seat 230 and the fixed seat 220 can be flexibly adjusted according to the actual length of the rear cantilever 100, so that the first X-direction positioning member 310 and the second X-direction positioning member 320 can respectively abut against the two ends of the rear cantilever 100. This rear cantilever positioning fixture can be used to clamp and position rear cantilever 100 of different lengths of this structure. (2) This rear cantilever positioning fixture can be positioned in the X direction by the first X-direction positioning component 310 and the second X-direction positioning component 320 respectively abutting against the two ends of the rear cantilever 100, that is, positioning the length direction of the rear cantilever 100. Then, the two first Y-direction positioning components 410 and the two second Y-direction positioning components 420 can be abutting against the two sides of the rear cantilever 100 respectively, thereby positioning the Y direction of the rear cantilever 100, that is, positioning the width direction of the rear cantilever 100. Then, the rear cantilever 100 is pressed by the pressing mechanism 500, thereby positioning the Z direction of the rear cantilever 100, thus realizing the positioning of the rear cantilever 100 in three directions. (3) This rear cantilever positioning fixture is suitable for clamping and positioning the rear cantilever 100 of this long rod structure. It can effectively clamp and position the rear cantilever 100 of this long rod structure and avoid the situation of incomplete clamping.

[0036] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A rear cantilever positioning fixture, characterized in that, include: A load-bearing mechanism having a load-bearing surface for mounting a rear cantilever; The X-axis positioning mechanism includes a first X-axis positioning member and a second X-axis positioning member. The first X-axis positioning member and the second X-axis positioning member are respectively disposed at both ends of the rear cantilever in the length direction and are respectively used to abut against both ends of the rear cantilever. The Y-axis positioning mechanism includes two first Y-axis positioning components, which are respectively disposed on both sides of the rear cantilever in the width direction and are respectively used to abut against both sides of the rear cantilever. A clamping mechanism, used to clamp or release the rear cantilever.

2. The rear cantilever positioning fixture according to claim 1, characterized in that, The supporting mechanism includes a platform, a fixed seat, a movable seat, and a pad. The fixed seat is fixedly connected to the platform, and the movable seat is detachably connected to the platform. The movable seat has a fastened state that is securely fastened to the platform and an adjustable state that can reciprocate linearly on the platform to adjust the distance between the movable seat and the fixed seat. The pad is detachably fixedly connected to the movable seat, and the top of the pad forms the supporting surface. The first X-axis positioning member is fixedly connected to the fixed seat, and the second X-axis positioning member is fixedly connected to the movable seat.

3. The rear cantilever positioning fixture according to claim 1, characterized in that, The first X-axis positioning element is a positioning groove with a V-shaped longitudinal section, which is used to clamp the annular part of the rear cantilever.

4. The rear cantilever positioning fixture according to claim 1, characterized in that, The second X-axis positioning element is a positioning pin, which is vertically arranged and used to abut against the fork portion of the rear cantilever.

5. The rear cantilever positioning fixture according to claim 2, characterized in that, Both first Y-axis positioning components are close to the fork portion of the rear cantilever. The Y-axis positioning mechanism also includes two second Y-axis positioning components. The two second Y-axis positioning components are respectively disposed on both sides of the width direction of the rear cantilever, both close to the ring portion of the rear cantilever. The two second Y-axis positioning components are respectively used to abut against both sides of the rear cantilever.

6. The rear cantilever positioning fixture according to claim 5, characterized in that, Both of the first Y-axis positioning components include a retaining block and an adjusting member. The bottom of the retaining block is slidably connected to the movable seat, and the adjusting member is connected to the retaining block for driving the retaining block closer to or away from the rear cantilever, so that the retaining block abuts or releases the rod part of the rear cantilever.

7. The rear cantilever positioning fixture according to claim 6, characterized in that, The movable seat has a first screw hole, and the adjusting component is a first screw rod. The first screw rod is horizontally arranged and passes through the first screw hole. The first screw rod is threadedly connected to the first screw hole, and the end of the first screw rod near the abutment block is fixedly connected to the abutment block.

8. The rear cantilever positioning fixture according to claim 5, characterized in that, Both second Y-axis positioning components are disposed between the fixed seat and the movable seat. Both second Y-axis positioning components include a support seat and a clamping member. The bottom of the support seat is fixedly connected to the platform. The clamping member is detachably connected to the support seat and is used to clamp the rod part of the rear cantilever.

9. The rear cantilever positioning fixture according to claim 8, characterized in that, The top of the support base is provided with a second screw hole, and the clamping member is a second screw rod. The second screw rod is horizontally arranged and passes through the second screw hole. The second screw rod is threadedly connected to the second screw hole, and the end of the second screw rod near the rear cantilever is used to clamp the rod body of the rear cantilever.

10. The rear cantilever positioning fixture according to claim 2, characterized in that, The clamping mechanism includes two clamping rods, which are respectively disposed on both sides of the rear cantilever in the width direction. One end of each clamping rod is detachably connected to the movable seat, and the other end of each clamping rod is used to clamp or release the fork portion of the rear cantilever.

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