Helical spring pre-press mounting rack

Abstract

The utility model provides a spiral spring pre-press-fitting rack, and relates to the technical field of spring assembling. The spiral spring pre-press-fitting rack comprises a frame, a supporting seat and a locking mechanism, the locking mechanism comprises a first pressing block, a second pressing block and a locking assembly, the first pressing block and the second pressing block are arranged at the two ends of a spiral spring in a sleeving mode respectively and get close to each other along with movement of a press-fit piece, and therefore the spiral spring can be compressed and assembled conveniently and rapidly. In the compressed state, the two axial ends of the spiral spring abut against the two opposite sides of the first pressing block and the second pressing block correspondingly, and the locking assembly abuts against the two opposite sides of the first pressing block and the second pressing block so as to limit the first pressing block and the second pressing block to move relatively in the axial direction of the spiral spring. And in the release state, the first pressing block and the second pressing block can be separated from the locking assembly in the direction different from the axial direction of the spiral spring and enable the spiral spring to release the elastic force, so that the pre-compressed spiral spring is conveniently installed.

Description

Technical Field

[0001] This application relates to the field of spring assembly technology, and in particular to a pre-compression mounting stand for helical springs. Background Technology

[0002] Helical springs are one of the most widely used spring types due to their ease of manufacture and ability to be designed in various forms to meet load requirements, resulting in a simple structure. However, in practical applications, helical springs usually need to be pre-compressed and installed in a specific position. Because of their high rigidity, the compression process is relatively difficult. When assembling helical springs, operators often need to use auxiliary tools. During this process, the spring's elasticity generates a counterforce, which not only increases the difficulty of operation but may also cause injury to the operator. Utility Model Content

[0003] This application provides a helical spring pre-compression mounting frame to solve the problem that spring compression and assembly operations are inconvenient and can easily cause injury to operators.

[0004] In some embodiments, a pre-compression mounting frame for a helical spring is provided, including a frame, a support base, and a locking mechanism. A pressing member is movably connected to the frame along a first direction. The support base is fixedly mounted on the frame to maintain the axis of the helical spring extending along the first direction. The locking mechanism includes a first pressing block, a second pressing block, and a locking assembly. The first pressing block and the second pressing block are respectively sleeved on both ends of the helical spring and move closer to each other as the pressing member moves. The first pressing block and the second pressing block have a compressed state and a released state that cooperate with the helical spring. In the compressed state, both axial ends of the helical spring respectively abut against the spring. The first and second pressure blocks are positioned opposite each other, with a first distance between them. The locking assembly abuts against the opposite sides of the first and second pressure blocks to restrict their relative movement along the axial direction of the helical spring. In the released state, the distance between the first and second pressure blocks is adjusted to a second distance by the locking assembly. This second distance is greater than the first distance, allowing the first and second pressure blocks to disengage from the locking assembly along a second direction and release the spring force. This second direction is inclined to the axial direction of the helical spring.

[0005] In some embodiments, the first pressure block includes a first through hole, and a first notch communicating with the first through hole is provided on the circumferential side of the first through hole; the second pressure block includes a second through hole, and a second notch communicating with the second through hole is provided on the circumferential side of the second through hole; the locking assembly includes a guide rod, which passes through the first through hole and the second through hole in the compressed state; in the released state, the first pressure block disengages from the guide rod along the second direction through the first notch, and the second pressure block disengages from the guide rod along the second direction through the second notch.

[0006] In some embodiments, the orientations of the first notch and the second notch form an angle of 90° to 120° on a first plane, the first plane being a reference plane perpendicular to the axial direction of the helical spring.

[0007] In some embodiments, the first pressure block includes a first arc groove disposed on the side of the first through hole ring. In the compressed state, the helical spring is engaged in the first arc groove to prevent the first pressure block from disengaging from the guide rod at the first notch. The bottom wall of the first arc groove exerts an axial force on the helical spring to keep the helical spring in a compressed state.

[0008] In some embodiments, the second pressure block includes a second arc groove disposed on the side of the second through hole ring. In the compressed state, the helical spring is engaged in the second arc groove to prevent the second pressure block from disengaging from the guide rod at the second notch. The bottom wall of the second arc groove exerts an axial force on the helical spring to keep the helical spring in a compressed state.

[0009] In some embodiments, the locking assembly further includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion being respectively disposed on opposite sides of the first pressure block and the second pressure block, and at least one of the first limiting portion and the second limiting portion being threadedly connected to the guide rod.

[0010] In some embodiments, the helical spring pre-compression mounting frame further includes a lifting mechanism, which includes a guide rail, a transmission component, and a motor. The guide rail is fixedly mounted on the frame. The transmission component is connected to the pressing component and is used to drive the pressing component to move along the guide rail to a set position to compress and assemble the helical spring. The motor is electrically connected to the transmission component.

[0011] In some embodiments, the lifting mechanism further includes a first limit switch and a second limit switch, wherein the first limit switch is disposed at the initial position of the helical spring and the second limit switch is disposed at the extreme position of the compressed helical spring.

[0012] In some embodiments, a protective net is also included, which surrounds the periphery of the frame and closes during the compression of the helical spring to prevent the helical spring from being ejected outside the protective net.

[0013] In some embodiments, the support base is detachably fixed to the frame, and the support base is in contact with the annular side of the helical spring.

[0014] The pre-compression mounting frame for helical springs provided in this application allows for the following assembly: First, the helical spring is placed on a support base, maintaining it in a first direction. Then, a first and second pressure block are installed at both ends of the helical spring. As the pressing components move, the helical spring is compressed, and the first and second pressure blocks move closer together. The distance between the first and second pressure blocks is locked by a locking assembly, keeping the helical spring in a compressed state. This compression operation is convenient. When installing the pre-compressed helical spring, the locking assembly can be loosened, and the upper and lower pressure blocks can be removed along a second direction, which is inclined to the axial direction of the helical spring. This means the first and second pressure blocks do not need to be removed from the axial direction of the helical spring, allowing for easier and faster installation of the helical spring to the designated position. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of the helical spring pressing stand in some embodiments of this application;

[0017] Figure 2 yes Figure 1 A front view of the helical spring pressing stand in the embodiment;

[0018] Figure 3 yes Figure 1 A schematic diagram illustrating the connection relationship between the helical spring and the locking mechanism under compressed conditions in the embodiment;

[0019] Figure 4 yes Figure 3 An exploded view of the helical spring and locking mechanism in the embodiment.

[0020] In the above attached figures:

[0021] 10. Frame; 11. Support base; 12. Pressing component; 13. Lifting mechanism; 131. Transmission assembly; 132. Motor; 133. Guide rail; 134. First limit switch; 135. Second limit switch;

[0022] 20. Locking mechanism; 21. First pressure block; 211. First through hole; 212. First notch; 213. First arc groove; 22. Second pressure block; 221. Second through hole; 222. Second notch; 223. Second arc groove; 23. Guide rod; 24. Locking assembly; 241. First limiting part; 242. Second limiting part;

[0023] 30. Helical spring. Detailed Implementation

[0024] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the application. Similarly, the following embodiments are only some, not all, embodiments of the present application, and all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present application.

[0025] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] Please see Figures 1 to 3 , Figure 1 This is a schematic diagram of the overall structure of the helical spring pressing stand in some embodiments of this application. Figure 2 yes Figure 1 A front view of the helical spring pressing stand in the embodiment. Figure 3 yes Figure 1 The embodiment shows a schematic diagram of the connection between the helical spring and the locking mechanism in the compressed state. This application provides a helical spring pre-compression mounting platform, including a frame 10, a support base 11, and a locking mechanism 20. The frame 10 is made of steel to ensure its strength, and is fixed to the ground to ensure stability. A pressing member 12 is movably connected to the frame 10 along a first direction. The pressing member 12 can be plate-shaped, block-shaped, or other shapes, without specific limitations here. The support base 11 is fixedly mounted on the frame 10 to maintain the axis of the helical spring 30 extending along the first direction. Figure 2 The vertical direction in the figure represents the first direction. In other embodiments, the first direction can be other directions, as long as the first direction is consistent with the compression direction of the helical spring 30. The locking mechanism 20 includes a first pressing block 21, a second pressing block 22, and a locking assembly 24. The first pressing block 21 and the second pressing block 22 are respectively sleeved on both ends of the helical spring 30 and move closer to each other as the pressing member 12 moves. The first pressing block 21 and the second pressing block 22 have a compressed state and a relaxed state that cooperate with the helical spring 30.

[0028] In the compressed state, the two ends of the helical spring 30 in the axial direction respectively abut against the opposite sides of the first pressure block 21 and the second pressure block 22. The distance between the first pressure block 21 and the second pressure block 22 is the first distance. The locking component 24 abuts against the opposite sides of the first pressure block 21 and the second pressure block 22 to restrict the relative movement of the first pressure block 21 and the second pressure block 22 along the axial direction of the helical spring 30.

[0029] In the released state, the distance between the first pressure block 21 and the second pressure block 22 is adjusted to a second distance by the locking assembly 24. The second distance is greater than the first distance. The first pressure block 21 and the second pressure block 22 can disengage from the locking assembly 24 along the second direction and cause the coil spring 30 to release its elastic force. The second direction is inclined to the axial direction of the coil spring 30 and can be parallel to the radial direction of the coil spring 30.

[0030] In this embodiment, when assembling the coil spring 30 in compression, the operator can first place the coil spring 30 on the support base 11, making the coil spring 30 vertical. Then, the first pressure block 21 and the second pressure block 22 are installed on the outer ring of the coil spring 30. As the pressing component 12 moves, the coil spring 30 is compressed. At the same time, the first pressure block 21 and the second pressure block 22 move closer to each other. The distance between the first pressure block 21 and the second pressure block 22 is locked by the locking component 24 to keep the coil spring 30 in a compressed state. After the compression operation is completed, the pressing component 12 is reset. When installing the pre-compressed coil spring 30, the locking component 24 can be loosened, and the upper and lower pressure blocks can be removed along the second direction. It should be noted that the second direction is inclined to the axial direction of the coil spring 30. That is to say, the first pressure block 21 and the second pressure block 22 do not need to be removed from the axial direction of the coil spring 30, which makes it easier and faster to install the coil spring 30. For example, in automobile manufacturing, the efficiency of rear suspension assembly is a key indicator of the overall efficiency of the final assembly line. The rear coil spring 30 assembly connects the rear suspension assembly and the lower body assembly. During the assembly of the rear suspension assembly, the coil spring 30 is compressed, generating elastic potential energy, which causes the rear suspension assembly to be subjected to force during assembly, thus affecting assembly efficiency. This application compresses the coil spring 30 before automobile assembly and maintains the coil spring 30 in a compressed state through a locking mechanism 20. This prevents the rear suspension assembly from being squeezed by the coil spring 30 during the assembly process with the body, facilitating the alignment of the rear suspension assembly with the body and improving assembly efficiency.

[0031] Please see Figure 3 as well as Figure 4 , Figure 4 yes Figure 3 An exploded view of the helical spring and locking mechanism in the embodiment. In some embodiments, the first pressing block 21 includes a first through hole 211, and a first notch 212 communicating with the first through hole 211 is provided on the circumferential side of the first through hole 211; the second pressing block 22 includes a second through hole 221, and a second notch 222 communicating with the second through hole 221 is provided on the circumferential side of the second through hole 221; the locking assembly 24 includes a guide rod 23, which passes through the first through hole 211 and the second through hole 221 in the compressed state; in the released state, the first pressing block 21 disengages from the guide rod 23 in the second direction through the first notch 212, and the second pressing block 22 disengages from the guide rod 23 in the second direction through the second notch 222.

[0032] Furthermore, the first pressure block 21 includes a first arc groove 213 located on the annular side of the first through hole 211. In the compressed state, the helical spring 30 is engaged in the first arc groove 213 to prevent the first pressure block 21 from disengaging from the guide rod 23 at the first notch 212. The bottom wall of the first arc groove 213 exerts an axial force on the helical spring 30 to keep the helical spring 30 in a compressed state.

[0033] The second pressure block 22 includes a second arc groove 223 located on the annular side of the second through hole 221. In the compressed state, the helical spring 30 is engaged in the second arc groove 223 to prevent the second pressure block 22 from disengaging from the guide rod 23 at the second notch 222. The bottom wall of the second arc groove 223 exerts an axial force on the helical spring 30 to keep the helical spring 30 in a compressed state.

[0034] The widths of the first notch 212 and the second notch 222 are slightly larger than the diameter of the guide rod 23, so that the first pressure block 21 can be fitted onto or detached from the guide rod 23 through the first notch 212, and the second pressure block 22 can be fitted onto or detached from the guide rod 23 through the second notch 222. When compressing the helical spring 30, the guide rod 23 is first passed through the center of the helical spring 30, and then the first pressure block 21 and the second pressure block 22 are respectively fitted onto both ends of the helical spring 30. The first through hole 211 of the first pressure block 21 and the second through hole 221 of the second pressure block 22 correspond to the axis of the guide rod 23. At the same time, the working coils at both ends of the helical spring 30 are embedded in the first arc groove 213 of the first pressure block 21 and the second arc groove 223 of the second pressure block 22, so that the first pressure block 21 and the second pressure block 22 can apply axial force to the helical spring 30, maintain the compressed state of the helical spring 30, and prevent the first pressure block 21 from detaching from the first notch 212 or the second pressure block 22 from detaching from the second notch 222 during the compression process.

[0035] Understandably, in the compressed state, the helical spring 30, the first pressure block 21, and the second pressure block 22 mutually restrain each other. The axial direction of the helical spring 30 is squeezed by the first pressure block 21 and the second pressure block 22, while the first pressure block 21 and the second pressure block 22 are held by the helical spring 30 around the guide rod 23. The closer the distance between the first pressure block 21 and the second pressure block 22, the greater the compression of the helical spring 30, and the greater the holding force of the helical spring 30 on the first pressure block 21 and the second pressure block 22. Consequently, the gap between the working coils of the helical spring 30 is smaller, and it is more difficult for the working coils of the helical spring 30 to disengage from the first arc groove 213 and the second arc groove 223. When it is necessary to disassemble the locking mechanism 20, by increasing the distance between the first pressure block 21 and the second pressure block 22, some of the elastic force can be released, and the gap between the working coils of the helical spring 30 increases accordingly. The smaller the holding force of the helical spring 30 on the first pressure block 21 and the second pressure block 22, the more the first arc groove 213 can disengage from the working coil of the helical spring 30 along the axial direction of the helical spring 30. Then, the first pressure block 21 can disengage from the guide rod 23 through the first notch 212 in a direction different from the axial direction of the helical spring 30. At the same time, the second arc groove 223 can disengage from the working coil of the helical spring 30 along the axial direction of the helical spring 30. Then, the second pressure block 22 can also disengage from the guide rod 23 through the second notch 222 in a direction different from the axial direction of the helical spring 30. Finally, the guide rod 23 is pulled out from the gap of the helical spring 30.

[0036] In this embodiment, the first pressing block 21 and the second pressing block 22 are plastic parts. The press frame for the helical spring 30 can be configured with a variety of first pressing blocks 21 and second pressing blocks 22 of different specifications, so that the pressing and locking of helical springs 30 of different specifications can be achieved.

[0037] Please see Figure 3 as well as Figure 4 In some embodiments, the orientation of the first notch 212 and the second notch 222 forms an angle of 90° to 120° on a first plane, which is a reference plane perpendicular to the axial direction of the helical spring 30. The orientation of the first notch 212 and the second notch 222 can be 90°, 95°, 100°, 105°, 110°, 115°, or 120°.

[0038] Please see Figure 2In some embodiments, the locking assembly 24 further includes a first limiting portion 241 and a second limiting portion 242, which are respectively disposed on opposite sides of the first pressing block 21 and the second pressing block 22. At least one of the first limiting portion 241 and the second limiting portion 242 is threadedly connected to the guide rod 23. In other embodiments, at least one of the first limiting portion 241 and the second limiting portion 242 may also be a pneumatic locking component or other locking structure that cooperates with the guide rod 23. The pneumatic locking structure is a structure familiar to those skilled in the art and will not be described in detail here. It is understood that the projection range of the first through hole 211 on the first plane is within the projection range of the first limiting portion 241 on the first plane, and the projection range of the second through hole 221 on the first plane is within the projection range of the second limiting portion 242 on the first plane. In this way, the first limiting portion 241 and the second limiting portion 242 can respectively provide support force to the opposite sides of the first pressing block 21 and the second pressing block 22.

[0039] In some embodiments, the pre-pressing frame for the helical spring further includes a lifting mechanism 13. The lifting mechanism 13 includes a guide rail 133, a transmission assembly 131, and a motor 132. The guide rail 133 is fixedly mounted on the frame 10. The transmission assembly 131 is connected to the pressing member 12 and is used to drive the pressing member 12 to move along the guide rail 133 to a set position to compress and assemble the helical spring 30. The motor 132 is electrically connected to the transmission assembly 131. In this embodiment, the transmission assembly 131 can be a lead screw, and the pressing member 12 is threadedly connected to the lead screw. The motor 132 drives the lead screw to rotate, and then the pressing member 12 moves to press the helical spring 30 through threaded transmission. In other embodiments, the transmission assembly 131 can be a gear and rack transmission mechanism. The motor 132 drives the gear to rotate, and the gear meshes with the rack to drive the rack to move. The pressing member 12 is fixed on the rack and moves with the rack to press the helical spring 30.

[0040] Optionally, limiters can be provided at both ends of the guide rail 133. The limiters can restrict the movement of the slider pressing part 12 within the preset length range of the guide rail 133 to avoid excessive movement.

[0041] In some embodiments, the lifting mechanism 13 further includes a first limit switch 134 and a second limit switch 135. The first limit switch 134 is located at the initial position of the helical spring 30, and the second limit switch 135 is located at the extreme compression position of the helical spring 30. By setting the first limit switch 134 and the second limit switch 135, the compression amount of the helical spring 30 can be clearly defined. When the pressing member 12 gradually approaches the second limit switch 135 from the first limit switch 134 until the second limit switch 135 actuates, it indicates that the helical spring 30 is installed in place. The first limit switch 134 and the second limit switch 135 can be proximity switches or other photoelectric sensors, etc. Through the above settings, the pressing of the helical spring 30 into place can be automatically ensured.

[0042] In some embodiments, the helical spring preload mounting frame also includes a protective net surrounding the periphery of the frame 10. The protective net closes during the compression of the helical spring 30 to prevent the helical spring 30 from being ejected outside the protective net.

[0043] Please see Figure 1 In some embodiments, the support base 11 is detachably and fixedly connected to the frame 10. The support base 11 is fitted to the annular side of the coil spring 30. The support base 11 is configured as a contoured part that matches the profile of the coil spring 30. By fitting the support base 11 to the coil spring 30, the spring can be kept in a vertical state. Furthermore, the detachable and fixed connection between the support base 11 and the frame 10 facilitates the replacement of support members of different specifications, thereby enabling the support of the coil spring 30 to be maintained when compressing coil springs of different specifications.

[0044] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. Any equivalent device or equivalent process transformation made based on the content of this application specification and drawings, or direct or indirect application in other related technical fields, are similarly included in the patent protection scope of this application.

Claims

1. A pre-loading rack for helical springs, characterized in that, include: A frame, wherein a pressing member is movably connected to the frame along a first direction; A support base, fixedly mounted on the frame, is used to keep the axis of the helical spring extending along a first direction; The locking mechanism includes a first pressing block, a second pressing block, and a locking assembly. The first pressing block and the second pressing block are respectively sleeved on both ends of the helical spring and move closer to each other as the pressing member moves. The first pressing block and the second pressing block have a compressed state and a released state that cooperate with the helical spring. In the compressed state, the two ends of the helical spring in the axial direction respectively abut against the opposite sides of the first pressure block and the second pressure block, the distance between the first pressure block and the second pressure block is a first distance, and the locking assembly abuts against the opposite sides of the first pressure block and the second pressure block to restrict the relative movement of the first pressure block and the second pressure block along the axial direction of the helical spring; In the released state, the distance between the first pressure block and the second pressure block is adjusted to a second distance by the locking assembly. The second distance is greater than the first distance. The first pressure block and the second pressure block can disengage from the locking assembly along a second direction and cause the helical spring to release its elastic force. The second direction is inclined to the axial direction of the helical spring.

2. The helical spring pre-compression mounting frame according to claim 1, characterized in that, The first pressure block includes a first through hole, and the circumferential side of the first through hole is provided with a first notch communicating with the first through hole; The second pressure block includes a second through hole, and a second notch communicating with the second through hole is provided on the periphery of the second through hole; The locking assembly includes a guide rod. In the compressed state, the guide rod passes through the first through hole and the second through hole. In the released state, the first pressure block disengages from the guide rod through the first notch along the second direction, and the second pressure block disengages from the guide rod through the second notch along the second direction.

3. The helical spring pre-compression mounting frame according to claim 2, characterized in that, The orientation of the first notch and the second notch forms an angle of 90° to 120° on a first plane, which is a reference plane perpendicular to the axis of the helical spring.

4. The helical spring pre-compression mounting frame according to claim 2 or 3, characterized in that, The first pressure block includes a first arc groove on the side of the first through hole ring. In the compressed state, the helical spring is engaged in the first arc groove to prevent the first pressure block from disengaging from the guide rod at the first notch. The bottom wall of the first arc groove exerts an axial force on the helical spring to keep the helical spring in a compressed state.

5. The helical spring pre-compression mounting frame according to claim 2 or 3, characterized in that, The second pressure block includes a second arc groove located on the side of the second through hole ring. In the compressed state, the helical spring is engaged in the second arc groove to prevent the second pressure block from disengaging from the guide rod at the second notch. The bottom wall of the second arc groove exerts an axial force on the helical spring to keep the helical spring in a compressed state.

6. The helical spring pre-compression mounting frame according to claim 2 or 3, characterized in that, The locking assembly further includes a first limiting part and a second limiting part, which are respectively disposed on the opposite sides of the first pressure block and the second pressure block. At least one of the first limiting part and the second limiting part is threadedly connected to the guide rod.

7. The helical spring pre-compression mounting frame according to any one of claims 1 to 3, characterized in that, The helical spring preload mounting platform also includes a lifting mechanism, which comprises: The guide rail is fixedly mounted on the frame; A transmission component, connected to the pressing member, is used to drive the pressing member to move along the guide rail to a set position to compress and assemble the helical spring; The motor is electrically connected to the transmission assembly.

8. The helical spring pre-compression mounting frame according to claim 7, characterized in that, The lifting mechanism further includes a first limit switch and a second limit switch. The first limit switch is located at the initial position of the helical spring, and the second limit switch is located at the extreme position of the compressed helical spring.

9. The helical spring pre-compression mounting frame according to claim 1, characterized in that, It also includes a protective net, which is arranged around the perimeter of the frame and closes during the compression of the helical spring to prevent the helical spring from being ejected outside the protective net.

10. The helical spring preload mounting frame according to claim 1, characterized in that, The support base is detachably and fixedly connected to the frame, and the support base is in contact with the annular side of the helical spring.

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