Transfer structure frame for manufacturing automobile brake disc

Abstract

The utility model belongs to the technical field of brake disc transfer, and particularly relates to a transfer structural frame for automobile brake disc manufacturing, which comprises a frame, a plurality of groups of suspension brackets and a plurality of five-jaw chucks. In the transfer structural frame for manufacturing the automobile brake disc, when the inner wall of a through hole of the brake disc is in contact with arc-shaped guide surfaces of the outer edges of the five mechanical claws, the brake disc applies radial pressure to the five mechanical claws, so that the five mechanical claws contract inwards, the mechanical claws act on sliding columns through hinge plates, and the sliding columns extend outwards along sliding holes; the reset spring fixed between the limiting plate and the disc is stretched until the brake disc completely crosses the five-jaw chuck and is arranged on the periphery of the cross rod in a sleeving mode, at the moment, the reset spring elastically returns to the initial state, and by repeating the process, the multiple brake discs can be positioned on the cross rod in a sleeving mode to be transferred. The brake disc is axially limited by the five mechanical claws in the unfolded state, axial movement caused by jolting in the transfer process of the brake disc is prevented, and the situation that the brake disc accidentally falls off in the transfer process is avoided.

Description

A transfer structure frame for manufacturing automotive brake discs Technical Field

[0001] This application belongs to the field of brake disc transfer technology, specifically relating to a transfer structure frame for manufacturing automotive brake discs. Background Technology

[0002] The brake disc is a crucial component of a car's braking system. It is typically mounted on the wheel and rotates synchronously with it. When the brake pedal is pressed, the brake caliper clamps the brake disc to generate braking force through friction, thus slowing the car down or bringing it to a stop.

[0003] In related technologies, the manufacturing process of brake discs includes multiple steps such as casting, machining, heat treatment, and painting. Therefore, the brake discs need to be frequently transferred during the manufacturing process to facilitate subsequent processing. Since the brake disc is circular in shape and has a through hole in the central area, it is generally mounted on the crossbar of a transfer vehicle for transport.

[0004] However, the above-mentioned transportation method has the following drawbacks: when the clearance between the through hole diameter of the brake disc and the crossbar is too small, there are problems with fitting and the brake disc surface is easily scratched. When the clearance is too large, the bumps during transportation can easily cause the brake disc to move axially, and in severe cases, it may even fall off. Therefore, how to solve the above drawbacks is one of the problems that urgently need to be solved. Summary of the Invention

[0005] In view of this, this application provides a transfer structure frame for manufacturing automotive brake discs to solve the problem of axial movement that easily occurs when brake discs are sleeved on the crossbar for transfer in related technologies.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A transfer structure frame for manufacturing automotive brake discs includes:

[0008] The frame has four sets of rotatable wheels symmetrically arranged at its bottom;

[0009] Multiple sets of suspension frames, each set of suspension frames includes an upright plate and a crossbar vertically connected to the upright plate. The upright plate is vertically fixedly installed on the upper surface of the vehicle frame. The first end of the crossbar is fixedly connected to the top of the side of the upright plate. The second end of the crossbar is fixedly provided with a positioning rod. The positioning rod and the crossbar are coaxial. The end of the positioning rod is connected to a limit rod by a thread.

[0010] Multiple five-jaw chucks, each consisting of a disc and five mechanical jaws, wherein the central region of the disc has a central shaft hole along the thickness direction, wherein:

[0011] Five mechanical claw mounting posts are equidistantly distributed on one side surface of the disk. Each mechanical claw mounting post is vertically fixed to the disk. The disk has five sliding holes along its thickness direction. The five sliding holes correspond one-to-one with the five mechanical claw mounting posts, and the sliding holes are located on the side of the mechanical claw mounting post closer to the center of the disk.

[0012] The five mechanical claws are hinged to the five mechanical claw mounting posts one by one. Each mechanical claw is equipped with a hinge plate, a sliding column, a return spring, and a limiting plate. The mechanical claw is hinged to the sliding column through the hinge plate. The sliding column is slidably assembled in the corresponding sliding hole. The sliding column passes through the sliding hole and extends through the other side surface of the disk. The return spring is sleeved on the outer periphery of the part of the sliding column that extends through the other side surface of the disk. The limiting plate is provided at the end of the part of the sliding column that extends through the other side surface of the disk. The two ends of the return spring are respectively abutted and fixed to the limiting plate and the disk.

[0013] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, the outer diameter of the crossbar is equal to the diameter of the through hole of the brake disc, the outer diameter of the positioning rod is smaller than the outer diameter of the crossbar, the outer diameter of the limiting rod is equal to the outer diameter of the crossbar, the outer diameter of the disc is equal to the outer diameter of the crossbar, the diameter of the central shaft hole is equal to the outer diameter of the positioning rod, and the outer diameter of the return spring is larger than the outer diameter of the sliding hole.

[0014] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, in the initial state, the five mechanical jaws of the five-jaw chuck are in their maximum extended state, and the diameter of the contour circle formed by the outer edge surfaces of the five mechanical jaws is greater than the outer diameter of the disc; when the five mechanical jaws are in a fully retracted inward state, the diameter of the contour circle formed by the outer edge surfaces of the five mechanical jaws is equal to the outer diameter of the disc.

[0015] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, the length of the positioning rod is set to be greater than the distance from the outer surface of the five mechanical claws to the limiting plate when the five mechanical claws are in a fully retracted inward state.

[0016] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, the length of the positioning rod is set to the distance from the outer surface of the five mechanical claws to the limiting plate when the five mechanical claws are in a fully retracted inward state + (10~80) mm.

[0017] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, the circumferential surface of the disc is provided with multiple threaded holes in the radial direction that pass through the central shaft hole, for inserting radial positioning bolts to position and fix the five-jaw chuck to the positioning rod.

[0018] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, the outer edge surface of each mechanical claw is formed as an arc-shaped guide surface.

[0019] Furthermore, in the aforementioned transfer structure frame for manufacturing automotive brake discs, each of the mechanical claws has a polyurethane anti-slip layer on its surface, and the surface of the anti-slip layer has staggered anti-slip patterns.

[0020] Furthermore, the aforementioned transfer structure frame for manufacturing automotive brake discs also includes an axial clamping mechanism. The axial clamping mechanism includes a first abutment plate fixed to the first end of the vertical plate on the crossbar, a second abutment plate sleeved on the crossbar and spaced apart from the first abutment plate, and a spring sleeved on the crossbar between the first abutment plate and the second abutment plate. The length of the spring is equal to the distance between the first abutment plate and the second abutment plate, and one end of the spring is fixed to the first abutment plate and the other end is fixed to the second abutment plate.

[0021] The transfer structure frame for manufacturing automotive brake discs provided in this application has at least the following beneficial effects:

[0022] In the transfer structure frame for manufacturing automotive brake discs provided in this application, when the inner wall of the brake disc through hole contacts the arc-shaped guide surface of the outer edge of the five mechanical claws of the five-jaw chuck, the brake disc applies radial pressure to the five mechanical claws, causing the five mechanical claws to retract inward. The mechanical claws act on the sliding column through the hinge plate, causing the sliding column to extend outward along the sliding hole. The return spring fixed between the limiting plate and the disc is stretched until the brake disc completely passes over the five-jaw chuck and is fitted onto the outer circumference of the crossbar. At this time, the return spring elastically returns to its initial state. By repeating the above process, multiple brake discs can be fitted and positioned on the crossbar for transfer. The five mechanical claws in the unfolded state form an axial limit on the brake disc, which can prevent axial movement caused by bumps during the transfer of the brake disc, thereby avoiding the accidental detachment of the brake disc during the transfer process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for further understanding of the embodiments of this utility model and constitute a part of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0024] Figure 1 is a schematic diagram of the transfer structure frame for manufacturing automotive brake discs provided in an embodiment of this application;

[0025] Figure 2 is an exploded view of the assembly of the five-jaw chuck and crossbar in Figure 1;

[0026] Figure 3 is a schematic diagram of the five-jaw chuck in Figure 1;

[0027] Figure 4 is a schematic diagram of the front structure of the disk in Figure 3;

[0028] Figure 5 is a schematic diagram of the assembly structure of a single mechanical claw and a disk in Figure 3;

[0029] Figure 6 is a schematic diagram of the front structure of Figure 5;

[0030] Figure 7 is a schematic diagram of the structure of a transfer frame for manufacturing automotive brake discs provided in another embodiment of this application.

[0031] In the picture:

[0032] 100. Frame; 110. Wheel; 200. Vertical plate; 300. Crossbar; 310. Positioning rod; 320. Limiting rod; 400. Five-jaw chuck; 500. Disc; 510. Mechanical claw mounting post; 520. Sliding hole; 530. Central shaft hole; 600. Mechanical claw; 610. Hinge plate; 620. Sliding column; 630. Return spring; 640. Limiting plate; 700. Spring; 800. First abutment plate; 900. Second abutment plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] As shown in Figures 1-6, the transfer structure frame for manufacturing automotive brake discs provided in this embodiment includes a frame 100, multiple sets of suspension frames, and multiple five-jaw chucks 400. The frame 100 is the main structure of the transfer structure frame, primarily serving as a load-bearing and supporting element. Four sets of wheels 110 are symmetrically arranged at the bottom of the frame 100. Each set of wheels 110 is connected to the frame 100 via a rotatable connection, allowing the frame 100 to be moved to a designated location in the factory via the wheels 110. Preferably, the outer layer of the wheels 110 is covered with a polyurethane rubber vibration-damping layer. This rubber vibration-damping layer can adapt to the undulating surface of the factory, ensuring the frame 100 remains stable during the transfer of the brake discs.

[0035] Multiple suspension brackets are fixedly mounted on the upper surface of the frame 100 for suspending and positioning the brake discs. Specifically, each suspension bracket includes a vertical plate 200 and a horizontal bar 300 vertically connected thereto. The vertical plate 200 is vertically fixedly mounted on the upper surface of the frame 100. The first end of the horizontal bar 300 is fixedly connected to the top of the side of the vertical plate 200. The outer diameter of the horizontal bar 300 matches the through-hole diameter of the brake disc, preferably equal to the through-hole diameter of the brake disc. The outer circumference of the horizontal bar 300 is used to accommodate the brake disc to be transported. Furthermore, a positioning rod 310 is fixedly mounted on the second end (i.e., the free end) of the horizontal bar 300. The positioning rod 310 is coaxial with the horizontal bar 300, and its outer diameter is smaller than that of the horizontal bar 300. The end of the positioning rod 310 is threadedly connected to a limiting rod 320 with an outer diameter equal to that of the horizontal bar 300.

[0036] As shown in Figures 3-6, each five-jaw chuck 400 consists of a disc 500 and five mechanical jaws 600. The central area of ​​the disc 500 has a central shaft hole 530 along the thickness direction. The diameter of the central shaft hole 530 is equal to the outer diameter of the positioning rod 310. The outer diameter of the disc 500 is equal to the outer diameter of the crossbar 300. Therefore, the five-jaw chuck 400 can be slidably sleeved on the outer periphery of the positioning rod 310 through the central shaft hole 530 reserved on the disc 500. After the five-jaw chuck 400 is installed on the positioning rod 310, the five-jaw chuck 400 is positioned and fixed by threading the limiting rod 320 to the end of the positioning rod 310.

[0037] Five mechanical claw mounting posts 510 are evenly distributed circumferentially on one side surface of the disk 500, and each mechanical claw mounting post 510 is vertically fixed to the disk 500. In addition, the disk 500 is also provided with five sliding holes 520 along the thickness direction. The five sliding holes 520 correspond one-to-one with the five mechanical claw mounting posts 510, and the sliding holes 520 are located on the side of the mechanical claw mounting post 510 closer to the center of the disk 500.

[0038] Five mechanical claws 600 are hinged to five mechanical claw mounting posts 510 in a corresponding manner. Each mechanical claw 600 is equipped with a hinge plate 610, a sliding post 620, a return spring 630, and a limiting plate 640. The mechanical claw 600 is hinged to the sliding post 620 through the hinge plate 610. The sliding post 620 is slidably assembled in the corresponding sliding hole 520. The sliding post 620 passes through the sliding hole 520 and extends through the other side surface of the disk 500. The outer periphery of the part of the sliding post 620 that extends through the other side surface of the disk 500 is fitted with a return spring 630, and a limiting plate 640 is provided at the end of the part of the sliding post 620 that extends through the other side surface of the disk 500. The two ends of the return spring 630 are respectively abutted and fixed to the limiting plate 640 and the disk 500. The outer diameter of the return spring 630 is larger than the outer diameter of the sliding hole 520.

[0039] The circumferential surface of the disc 500 has multiple threaded holes (not shown) extending radially through the central shaft hole 530. These holes are used to insert radial positioning bolts to position and fix the five-jaw chuck 400 to the positioning rod 310. This prevents the five-jaw chuck 400 from sliding axially on the positioning rod 310, ensuring the normal expansion and contraction of the mechanical jaws 600. Simultaneously, the bolted connection facilitates subsequent disassembly and maintenance, thereby improving the maintainability and practicality of the structure.

[0040] The length of the positioning rod 310 is set to be greater than the distance from the outer surface of the five mechanical claws 600 to the limiting plate 640 when the five mechanical claws 600 are in the fully retracted inward state, so as to ensure the normal expansion and contraction of the mechanical claws 600. Preferably, the length of the positioning rod 310 is set to the distance from the outer surface of the five mechanical claws 600 to the limiting plate 640 when the five mechanical claws 600 are in the fully retracted inward state + (10~80) mm.

[0041] In this embodiment, as described above, the diameter of the through hole at the center of the brake disc is equal to the outer diameter of the crossbar 300, the limiting rod 320, and the disc 500, allowing the brake disc to slide across the limiting rod 320 and the disc 500 onto the crossbar 300. Furthermore, in the initial state, the five mechanical jaws 600 of the five-jaw chuck 400 are in their fully extended state, and the diameter of the contour circle formed by the outer edges of the five mechanical jaws 600 is greater than the outer diameter of the disc 500; when the five mechanical jaws 600 are in a fully retracted state, the diameter of the contour circle formed by the outer edges of the five mechanical jaws 600 is equal to the outer diameter of the disc 500.

[0042] Preferably, the outer edge surface of each mechanical claw 600 is made into an arc-shaped guide surface.

[0043] The working principle and process of the transfer structure frame for manufacturing automotive brake discs provided in the embodiments of this application are described below with reference to Figures 1-6.

[0044] First, remove the limiting rod 320 from the end of the positioning rod 310. Then, align the central shaft hole 530 of the disc 500 of the five-jaw chuck 400 with the positioning rod 310. Slide the five-jaw chuck 400 along the axial direction of the positioning rod 310 until the outer surfaces of the five mechanical jaws 600 are coplanar with the interface between the positioning rod 310 and the crossbar 300. Then, insert the radial positioning bolt into the radial threaded hole on the disc 500 and screw it until it abuts against the outer wall of the positioning rod 310. Finally, install the limiting rod 320 at the end of the positioning rod 310, thereby fixing the five-jaw chuck 400 to the positioning rod 310. Of course, there are many other fixing methods, which will not be elaborated on in this embodiment.

[0045] When the brake disc needs to be moved, the brake disc is slid axially from the end of the limiting rod 320. During the process of the brake disc contacting the arc-shaped guide surface of the outer edge of the five mechanical claws 600 of the five-jaw chuck 400 on the inner wall of the through hole, the brake disc applies radial pressure to the five mechanical claws 600, causing the five mechanical claws 600 to retract inward. The mechanical claws 600 act on the sliding column 620 through the hinge plate 610, causing the sliding column 620 to extend outward along the sliding hole 520 and abut against the return spring 630 fixed between the limiting plate 640 and the disc 500, which is stretched until the brake disc completely passes over the five-jaw chuck 400 and is fitted onto the outer periphery of the crossbar 300.

[0046] Once the brake disc has completely passed the five-jaw chuck 400, the return spring 630 elastically returns to its initial state, thereby pushing the five mechanical jaws 600 to expand outward to their initial positions, forming a limit ring structure.

[0047] Continue following the steps described above to install the remaining brake discs one by one on the outer periphery of the crossbar 300. The last brake disc is axially limited by the five mechanical claws 600 of the five-jaw chuck 400. Thus, the axial limiting action of the five-jaw chuck 400 positions the multiple brake discs on the crossbar 300 for transport, preventing axial movement caused by bumps during transport and thus avoiding accidental detachment of the brake discs during transport.

[0048] In some embodiments, as shown in FIG7, the transfer structure frame for manufacturing automotive brake discs provided in this application further includes an axial clamping mechanism. The axial clamping mechanism includes a first abutment plate 800 fixed to the first end of the vertical plate 200 and fixed to the crossbar 300; a second abutment plate 900 sleeved on the crossbar 300 and spaced apart from the first abutment plate 800; and a spring 700 sleeved on the crossbar 300 between the first abutment plate 800 and the second abutment plate 900. The length of the spring 700 is equal to the distance between the first abutment plate 800 and the second abutment plate 900, and one end is fixed to the first abutment plate 800 and the other end is fixed to the second abutment plate 900. After multiple brake discs are mounted on the crossbar 300, the spring 700 is in a compressed state. When the multiple brake discs become loose due to factors such as road bumps during the transfer process, the spring 700 uses its elasticity to press the brake discs in real time.

[0049] By setting an axial clamping mechanism at the first end of the crossbar 300, the multiple brake discs mounted on the crossbar 300 are axially limited on one side by the five-jaw chuck 400 and axially limited on the other side by the axial clamping mechanism. This double axial limitation can further effectively suppress the small axial displacement of the brake discs in a bumpy environment, and is especially suitable for scenarios where multiple discs are stacked, thus improving the overall reliability of the fixation.

[0050] In some embodiments, each mechanical gripper 600 has a polyurethane anti-slip layer on its surface, and the anti-slip layer has staggered anti-slip patterns. The polyurethane material combines elasticity and anti-slip properties, increasing the coefficient of friction between the mechanical gripper 600 and the brake disc while protecting the brake disc surface from scratches through its soft texture. Furthermore, the staggered anti-slip patterns further disperse contact stress to prevent damage to the brake disc surface.

[0051] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement state shown in the accompanying drawings.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A transfer structure frame for manufacturing automotive brake discs, characterized in that, include: The frame has four sets of rotatable wheels symmetrically arranged at its bottom; Multiple sets of suspension brackets, each set including a vertical plate and a crossbar perpendicularly connected to the vertical plate. The vertical plate is vertically fixed to the upper surface of the vehicle frame. The first end of the crossbar is fixedly connected to the top of the side of the vertical plate, and the second end of the crossbar is fixedly provided with a positioning rod. The positioning rod and the crossbar are coaxial, and the end of the positioning rod is threadedly connected to a limit rod. Multiple five-jaw chucks, each consisting of a disc and five mechanical jaws. The central area of ​​the disc has a central shaft hole along the thickness direction. Five mechanical jaw mounting posts are equidistantly distributed circumferentially on one side surface of the disc, each mechanical jaw mounting post being perpendicularly fixedly connected to the disc. The disc has five sliding holes along the thickness direction. Five sliding holes correspond one-to-one with the five mechanical claw mounting posts, and the sliding holes are located on the side of the mechanical claw mounting posts near the center of the disk. The five mechanical claws are hinged to the five mechanical claw mounting posts one-to-one. Each mechanical claw is equipped with a hinge plate, a sliding post, a return spring, and a limiting plate. The mechanical claw is hinged to the sliding post through the hinge plate. The sliding post is slidably assembled in the corresponding sliding hole. The sliding post passes through the sliding hole and extends through the other side surface of the disk. The return spring is sleeved on the outer periphery of the portion of the sliding post that extends through the other side surface of the disk. The limiting plate is provided at the end of the portion of the sliding post that extends through the other side surface of the disk. The two ends of the return spring are respectively abutted and fixed to the limiting plate and the disk.

2. The transfer structure frame for manufacturing automotive brake discs according to claim 1, characterized in that, The outer diameter of the crossbar is equal to the diameter of the through hole of the brake disc, the outer diameter of the positioning rod is smaller than the outer diameter of the crossbar, the outer diameter of the limiting rod is equal to the outer diameter of the crossbar, the outer diameter of the disc is equal to the outer diameter of the crossbar, the diameter of the central shaft hole is equal to the outer diameter of the positioning rod, and the outer diameter of the return spring is larger than the outer diameter of the sliding hole.

3. The transfer structure frame for manufacturing automotive brake discs according to claim 2, characterized in that, In the initial state, the five mechanical jaws of the five-jaw chuck are in their maximum extended state, and the diameter of the contour circle formed by the outer edges of the five mechanical jaws is greater than the outer diameter of the disk; when the five mechanical jaws are in a fully retracted state, the diameter of the contour circle formed by the outer edges of the five mechanical jaws is equal to the outer diameter of the disk.

4. The transfer structure frame for manufacturing automotive brake discs according to claim 1, characterized in that, The length of the positioning rod is set to be greater than the distance from the outer surface of the five mechanical claws to the limiting plate when the five mechanical claws are in a fully retracted inward state.

5. The transfer structure frame for manufacturing automotive brake discs according to claim 1, characterized in that, The length of the positioning rod is set to the distance from the outer surface of the five mechanical claws to the limiting plate when the five mechanical claws are in the fully retracted inward state + (10~80) mm.

6. The transfer structure frame for manufacturing automotive brake discs according to claim 1, characterized in that, The disc has multiple threaded holes along the radial direction on its circumferential surface, which are used to insert radial positioning bolts to position and fix the five-jaw chuck to the positioning rod.

7. The transfer structure frame for manufacturing automotive brake discs according to claim 1, characterized in that, The outer edge of each of the mechanical claws is made into an arc-shaped guide surface.

8. The transfer structure frame for manufacturing automotive brake discs according to claim 1, characterized in that: Each of the mechanical claws has a polyurethane anti-slip layer on its surface, and the anti-slip layer has staggered anti-slip patterns on its surface.

9. The transfer structure frame for manufacturing automotive brake discs according to any one of claims 1 to 8, characterized in that, It also includes an axial clamping mechanism, which includes a first abutment plate fixed to the first end of the crossbar and fixed to the first end of the vertical plate, a second abutment plate sleeved on the crossbar and spaced apart from the first abutment plate, and a spring sleeved on the crossbar between the first abutment plate and the second abutment plate. The length of the spring is equal to the distance between the first abutment plate and the second abutment plate, and one end of the spring is fixed to the first abutment plate and the other end is fixed to the second abutment plate.

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