Stiffness-adjustable spring structure and pocket spring unit

Abstract

The present invention provides a stiffness-adjustable spring structure. The spring structure comprises a spring, an adjustment assembly and a covering assembly. The covering assembly is used for mounting the spring, and the adjustment assembly is used for adjusting the preload force of the spring. The adjustment assembly is arranged at one end of the spring and presses the spring. The adjustment assembly comprises a rotating member, a moving member and a support member. The moving member is movably mounted on the support member, and the rotating member is linked to the support member. The rotating member is rotated to drive the support member to rotate, and the moving member moves up and down along the support member under the rotation of the support member, and presses the spring. The spring structure solves the problems of existing springs that the spring preload force cannot be adjusted, the stiffness cannot be adjusted during use, and the function is limited.

Description

Adjustable hardness spring structure and spring package

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 2024107407826, filed on June 7, 2024, entitled “A spring structure with adjustable hardness and spring package”, and claims priority to it, the content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of household spring structure, and particularly relates to a spring structure with adjustable hardness and spring package. BACKGROUND

[0004] Household spring structure refers to a spring structure applied to household products, mainly used for providing elastic support and shock absorption. Common household spring structures include: (1) spring mattress, composed of spring mattress springs, used in household beds to provide comfortable sleep experience and back support; (2) household furniture, spring structures are widely used in seats, sofas, bed frames and other parts of furniture to improve the comfort and service life of furniture.

[0005] The softness and hardness of the household spring structure are determined according to the specific furniture use requirements and personal preferences, and the softness and hardness of the spring structure directly affect the use comfort of the household product. Generally speaking, the softer the spring structure of the mattress, sofa or other seat, the better the support and comfort it can provide. If the spring structure is too hard, it will reduce the elasticity and comfort of the seat or mattress, thereby affecting the overall comfort of the furniture.

[0006] A known independent bagged household spring structure, each spring is individually enclosed in a bag or sleeve, and then a plurality of independent bagged household spring structures are spliced to form furniture (mattress or cushion, etc.). The current household spring structure can only set its softness and hardness at the factory, and after the furniture is assembled, only the appropriate household spring can be found according to the requirements for assembly, and the softness and hardness of the furniture formed cannot be adjusted, which makes the softness and hardness of the household spring structure fixed when it is put into use, the function selection is single, and the user cannot adjust the softness and hardness of each place according to his own preference, which cannot meet the different requirements of the softness and hardness of the household spring structure when in use. SUMMARY

[0007] The main technical problem to be solved by the present application is that the existing spring cannot adjust the spring pre-tightening force, the softness and hardness cannot be adjusted when in use, and the function is single. Therefore, a spring structure with adjustable hardness is provided to solve the above-mentioned problems and realize the random adjustment of the spring pre-tightening force.

[0008] To solve the above technical problems, the present application provides a spring structure with adjustable hardness, which comprises a spring, an adjusting member and a covering member, the covering member is used for packing the spring, and the adjusting member is used for adjusting the pre-tightening force of the spring.

[0009] The adjusting member is arranged at one end of the spring and presses the spring; the adjusting member comprises a rotating member, a moving member and a supporting member, the moving member is movably installed on the supporting member, and the rotating member is connected with the supporting member in linkage.

[0010] The rotating member is rotated to drive the supporting member to rotate, and the moving member moves up and down along the supporting member under the rotation of the supporting member and presses the spring.

[0011] In a preferred embodiment, the supporting member comprises a threaded rod, and the threaded rod is connected with the rotating member; the moving member is screw-connected on the threaded rod.

[0012] In a preferred embodiment, the supporting member comprises a guide rod, and the moving member comprises an end face for pressing the spring.

[0013] The guide rod is arranged at the side of the threaded rod, the end face of the moving member is provided with a guide hole, and the guide rod is arranged in the guide hole.

[0014] In a preferred embodiment, four guide rods are arranged at the circumference of the threaded rod at equal intervals.

[0015] In a preferred embodiment, the rotating member is arranged at the top of the covering member; the rotating member is provided with a plug, the threaded rod is provided with a socket, and the plug is inserted into the socket.

[0016] In a preferred embodiment, the covering member comprises a cloth cover, an inner pressing cover and an outer pressing cover; the spring is installed in the cloth cover, and the inner pressing cover and the outer pressing cover are sequentially assembled and fixed to the spring in the cloth cover.

[0017] The threaded rod passes through the outer pressing cover and the inner pressing cover and is arranged in the cloth cover, the guide rod is fixed to the inner side of the inner pressing cover, and the rotating member is arranged above the outer pressing cover.

[0018] In a preferred embodiment, the moving member is a push cover, one side of the push cover for pressing the spring is provided with an annular groove, and one end of the spring is clamped in the annular groove.

[0019] In a preferred embodiment, the length of the threaded rod is at least one third of the overall length of the spring structure.

[0020] The present application also provides a spring package comprising the spring structure described above, and the spring package is a single-layer spring structure; the single-layer spring structure is a structure in which one spring is arranged in the covering member.

[0021] The application also provides a spring package, which is a double-layer spring structure, comprising an upper spring structure and a lower spring structure; one of the upper spring structure and the lower spring structure is the spring structure as described above, and the other is a rotating part of the one spring structure, and the upper spring structure and the lower spring structure can rotate relative to each other.

[0022] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0023] 1. By embedding the adjusting part in the spring structure, the spring is compressed along the spring tension direction, and the spring tension space is utilized. The more the spring is compressed, the greater the pre-tightening force of the spring is, and the hardness of the spring structure tends to be hard.

[0024] 2. By setting the rotating part and the moving part which moves up and down by cooperating with the rotation of the rotating part as the adjusting part, the rotating part is driven by external force, so that the moving part moves, the spring against the end face of the moving part is compressed, the compression amount changes with the movement of the moving part, the pre-tightening force of the spring is changed by the movement of the moving part, and the pre-tightening force of the spring can be adjusted at will. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 is a spring structure with adjustable hardness in the preferred embodiment of the application;

[0026] Fig. 2 is a rotating adjustment schematic diagram of the spring structure with adjustable hardness in the preferred embodiment of the application;

[0027] Fig. 3 is a rotating adjustment schematic diagram of the spring structure with adjustable hardness in the first embodiment of the application;

[0028] Fig. 4 is a double-layer spring structure with adjustable hardness in the second embodiment of the application;

[0029] Fig. 5 is an internal sectional view of the double-layer spring structure with adjustable hardness in the second embodiment of the application;

[0030] Fig. 6 is an initial use state diagram of the double-layer spring structure in the second embodiment of the application;

[0031] Fig. 7 is a rotating adjustment schematic diagram of the double-layer spring structure in the second embodiment of the application;

[0032] Fig. 8 is an initial use state diagram of the double-layer spring structure in the third embodiment of the application;

[0033] Fig. 9 is a rotating adjustment schematic diagram of the double-layer spring structure in the third embodiment of the application;

[0034] Fig. 10 is a double-layer spring structure with adjustable hardness in the third embodiment of the application.

[0035] Explanation of reference signs: 1, covering piece; 2, inner pressure cover; 3, outer pressure cover; 4, spring; 5, moving piece; 51, threaded hole; 52, guide hole; 6, guide rod; 7, threaded rod; 8, rotating piece; 81, pin; 9, spring package; 91, rotating top cover; 92, upper spring structure; 921, upper cloth bag; 922, upper spring; 923, upper spring push cover; 924, upper cloth bag upper pressure cover; 925, upper cloth bag lower pressure cover; 93, lower spring structure; 931, lower cloth bag; 932, lower spring; 933, lower cloth bag lower pressure cover; 934, lower cloth bag upper pressure cover; 935, lower spring push cover; 94, adjusting piece. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments; based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be wall-mounted connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements, and those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0039] Referring to FIGS. 1-10, the present embodiment provides a spring structure with adjustable hardness, which is used to prepare a spring package for filling a cushion in a mattress, a sofa and its seat chair, forming a support structure, providing elastic support and comfort.

[0040] The adjustable hardness of the spring structure refers to the adjustment of the tension space of the spring 4. By adjusting the height of the compressed spring 4, the compressed spring 4 is compressed so that the spring 4 has a greater pre-tightening force. The size of the pre-tightening force is proportional to the hardness of the support it provides. The greater the pre-tightening force, the greater the hardness.

[0041] As shown in FIGS. 1-2, the spring structure includes a spring 4, an adjusting member, and a covering member 1 for covering the spring 4. The adjusting member is used to compress the spring 4 to adjust the pre-tightening force of the spring 4. The covering member 1 can be a spring bag, a flexible sleeve, or a cloth bag or sleeve made of other flexible material. The individual spring 4 is independently loaded into the covering member 1, and the bagged springs are arranged to be spliced together to form a spring mattress or cushion.

[0042] The spring 4 is loaded into the covering member 1 as a supporting spring 4. The structure is a large-end and small-end structure. The large end is arranged as a supporting end at the bottom, and the small end is arranged as a force receiving end at the top. The top is the part of the spring 4 that bears external force load. In this way, when the spring 4 bears the load, it can provide stable elastic support.

[0043] The adjusting member is arranged at the small end of the spring 4 to press the small end of the spring 4 and change the pre-tightening force of the spring 4. In this way, when the spring 4 is compressed, the pressure on the spring 4 is stable and the adjustment operation is more convenient. The adjusting member includes a rotating member 8, a moving member 5, and a supporting member. The moving member 5 is movably mounted on the supporting member, and the rotating member 8 is linked with the supporting member. Rotating the rotating member 8 drives the supporting member to rotate. Under the rotating movement of the supporting member, the moving member 5 moves up and down along the supporting member. In the process of moving the moving member 5, the spring 4 is pressed so that the spring 4 is compressed.

[0044] The supporting member serves as a moving track for the moving member 5. The supporting member is arranged in the covering member 1 and passes through the spiral cavity of the spring 4. The length of the supporting member is set to the compression amount of the spring 4. When the moving member 5 moves away from the rotating member 8 to the bottom of the supporting member, the spring 4 is in the maximum compression amount. At this time, the spring structure is in the state of maximum hardness. When the moving member 5 moves close to the rotating member 8 to the top of the supporting member, the spring 4 is in the minimum compression amount. At this time, the spring structure is in the state of maximum softness. It should be noted that when the moving member 5 is at the top, the spring 4 is still pressed and is still in a state of having a certain pre-tightening force to provide elastic support for the spring structure.

[0045] The cooperation between the supporting member and the moving member 5 is as follows: the supporting member includes a threaded rod 7, the length of the threaded rod 7 is at least one-third of the overall length of the spring structure, and the center of the moving member 5 is provided with a threaded hole 51. Under the rotation of the supporting member, the moving member 5 moves downward or upward by the spiral cooperation of the threaded hole 51 and the threaded rod 7, so that the moving member 5 has movement.

[0046] Meanwhile, in order to ensure that the moving part 5 can produce a spiral downward or upward movement, and can stably move, the support part further comprises a guide rod 6, four guide rods 6 are arranged at intervals on the side of the threaded rod 7, and a guide hole 52 is arranged on the moving part 5, and the guide rod 6 is inserted into the guide hole 52. The guide rod 6 is fixedly arranged relative to the spiral rod, and when the moving part 5 is spirally matched with the support part, the cooperation of the four side guide rods 6 and the guide hole 52 makes the rotation of the moving part 5 in the spiral circumferential direction be limited, and the upward and downward movement in the spiral radial direction is generated under the action of the guide rod 6.

[0047] The rotating part 8 is arranged at the top of the cladding part 1 and outside the cladding part 1, and is used for external force rotating operation. The rotating part 8 is provided with a plug 81, and the threaded rod 7 is provided with a socket, and the plug 81 is inserted into the socket to realize the rotating linkage of the rotating part 8 and the threaded rod 7.

[0048] In order to stably arrange the adjusting part on the cladding part 1, the cladding part 1 comprises a cloth bag 1, an inner pressure cover 2 and an outer pressure cover 3, the cloth bag 1 is used for spring 4 bagging, the inner pressure cover 2 and the outer pressure cover 3 are arranged at the end of the cloth bag 1, and the end of the cloth bag 1 serves as a stress end. The inner pressure cover 2 and the outer pressure cover 3 are overlapped with each other, which is used for fixing the cloth bag 1 on one hand, and facilitating the arrangement of the adjusting part on the other hand.

[0049] A through hole is arranged at the center of the inner pressure cover 2 and the outer pressure cover 3, the threaded rod 7 passes through the outer pressure cover 3 and the inner pressure cover 2 and is arranged in the cloth bag 1, and the threaded rod 7 is rotatable relative to the outer pressure cover 3. The inner pressure cover 2 is clamped with the outer pressure cover 3, the guide rod 6 is fixed on the inner pressure cover 2 and is fixedly arranged relative to the threaded rod 7. The rotating part 8 is arranged at the upper end of the outer pressure cover 3, the rotating top cover 81 and 91 are the rotating part 8, the rotating top cover 91 and 81 are fixedly connected with the threaded rod 7 through plug-in connection, the guide rod 6 is fixed on the inner pressure cover 2 and passes through the moving part (spring push cover) 5, and the rotation of the moving part is limited,

[0050] In order to stably compress the spring 4, the moving part 5 is a push cover, the push cover is provided with a threaded hole 51 for screwing with the threaded rod 7, one side of the push cover for pressing the spring 4 is provided with an annular groove, and the small end of the spring 4 is clamped in the annular groove. Four guide holes 52 are arranged at intervals along the circumference of the push cover, the guide hole 52 cooperates with the guide rod 6, and under the action of the rotating part 8, the push cover descends along the threaded rod 7, compresses the spring 4, and makes the spring 4 have greater pre-tightening force.

[0051] The first embodiment, as shown in Figure 3.

[0052] A spring package 9 is provided, which is a single-layer spring structure, and the single-layer spring structure is a structure of arranging one spring 4 in the cladding part. The spring package 9 comprises a cloth bag 1, a spring 4, an outer pressure cover 3, an inner pressure cover 2, a threaded rod 7, a guide rod 6, a spring push cover (moving part 5) and a rotating top cover 91.

[0053] The spring 4 is installed in the cloth bag 1, and the inner pressure cover 2 and the outer pressure cover 3 are fixedly covered and fixed to the cloth bag 1. The threaded rod 7, the guide rod 6, the spring push cover (the moving piece 5) and the rotary top cover 91 constitute an adjusting piece 94. The rotary top cover 91 is a rotating piece 8, the rotary top cover 91 is fixedly connected with the threaded rod 7, the threaded rod 7 is rotatably arranged in the cloth bag 1 through the outer pressure cover 3 and the inner pressure cover 2, the guide rod 6 is fixed to the inner pressure cover 2 and passes through the moving piece (the spring push cover) 5, so as to limit the rotation of the moving piece, the spring push cover (the moving piece 5) is screw-connected with the threaded rod 7, and the spring push cover (the moving piece 5) is arranged close to the small end of the spring 4.

[0054] When the pre-pressing is adjusted, the rotary top cover 91 is rotated, the spring push cover (the moving piece 5) is lowered along the threaded rod 7, the spring 4 is compressed, the spring 4 has greater pre-tightening force after being compressed, and thus the hardness of the spring bag 9 can be adjusted.

[0055] The second embodiment is shown in Figs. 4-7.

[0056] A spring bag 9 is provided, which is a double-layer spring structure, and the double-layer spring structure comprises an upper spring structure 92 and a lower spring structure 93, and the upper spring structure 92 and the lower spring structure 93 each comprise a cladding piece structure in which a spring 4 is arranged.

[0057] The upper spring structure 92 comprises an upper cloth bag 921, an upper spring 922, an upper spring push cover 923, an upper cloth bag upper pressure cover 924 and an upper cloth bag lower pressure cover 925, the lower spring structure 93 comprises a lower cloth bag 931, a lower spring 932, a lower cloth bag lower pressure cover 933 and a lower cloth bag upper pressure cover 934, and the adjusting piece 94 comprises a threaded rod 7, a guide rod 6 arranged on the upper cloth bag upper pressure cover 924, an upper spring push cover 923 arranged in the upper spring structure 92 and a rotating piece 8.

[0058] The upper cloth bag upper pressure cover 924 and the upper cloth bag lower pressure cover 925 fix the upper cloth bag 921, and the upper spring 922 is installed in the upper cloth bag 921. The lower cloth bag lower pressure cover 933 and the lower cloth bag upper pressure cover 934 fix the lower cloth bag 931, and the lower spring 932 is installed in the lower cloth bag 931. The threaded rod 7 is installed in the upper cloth bag 921, passes through the upper cloth bag lower pressure cover 925 and the upper pressure cover 924, is screw-connected with the upper spring push cover 923, the pin 81 is arranged on the lower cloth bag upper pressure cover 934, the threaded rod 7 is provided with the socket, the pin 81 is inserted into the socket, and the threaded rod 7 is fixed to the lower cloth bag upper pressure cover 934. The lower cloth bag upper pressure cover 934 is connected with the upper cloth bag lower pressure cover 925, the upper cloth bag upper pressure cover 934 and the upper spring 922 serve as the rotating piece 8, and the upper spring structure 92 and the lower spring structure 93 can rotate relative to each other.

[0059] When the pre-press is adjusted, the upper spring structure 92 or the lower spring structure 93 can be rotated, but when the spring package 9 is in use, the lower spring structure 93 serves as a support and the upper spring structure 92 serves as a force, that is, the upper spring structure 92 is rotated, the upper spring push cover 923 rises along the threaded rod 7, the spring 4 is compressed, the spring 4 has greater pre-tightening force after being compressed, so that the hardness of the spring package 9 is adjustable.

[0060] The third embodiment is shown in Figs. 8-10.

[0061] Similar to the second embodiment, it is also a double-layer spring, and the difference from the second embodiment is that the spring tensioning adjusting member is arranged on the lower spring, specifically: the upper spring structure 92 includes an upper cloth bag 921, an upper spring 922, an upper cloth bag upper compression cover 924, and an upper cloth bag lower compression cover 925; the lower spring structure 93 includes a lower cloth bag 931, a lower spring 932, a lower spring push cover 935, a lower cloth bag lower compression cover 933, and a lower cloth bag upper compression cover 934; the adjusting member 94 includes a threaded rod 7, a guide rod 6 arranged on the lower cloth bag lower compression cover 933, a lower spring push cover 935 arranged in the lower spring structure 93, and a rotating member which is the upper spring structure or the lower spring structure.

[0062] The threaded rod 7 is rotatably arranged in the lower cloth bag 931 and passes through the lower cloth bag upper compression cover 934. In contrast to the second embodiment, the upper cloth bag lower compression cover 925 is provided with a plug 81, the threaded rod 7 is provided with a socket, the plug 81 is inserted into the socket, and the threaded rod 7 is fixed with the upper spring structure. The lower cloth bag upper compression cover 934 is connected with the upper cloth bag lower compression cover 925, the upper cloth bag lower compression cover 925 serves as a rotating member, and the upper spring structure 92 and the lower spring structure 93 can be relatively rotated.

[0063] When the pre-press is adjusted, the upper spring structure 92 is rotated, the threaded rod 7 rotates with the upper spring structure 92, the lower spring push cover 935 descends along the threaded rod 7, the spring 4 is compressed, and the spring 4 has greater pre-tightening force after being compressed, so that the hardness of the spring package 9 is adjustable.

[0064] The above is only a preferred specific embodiment of the present application, but the design concept of the present application is not limited thereto. Any person skilled in the art can make non-essential changes to the present application within the technical scope disclosed by the present application, and such changes shall be deemed to fall within the scope of protection of the present application. Industrial applicability

[0065] The present application provides a kind of hardness-adjustable spring structure, the spring structure includes spring, adjusting piece and cover piece, the cover piece is used to install spring, the adjusting piece is used to adjust the pre-tightening force of spring;The adjusting piece is arranged at one end of the spring, and extrudes the spring;The adjusting piece includes rotating piece, moving piece and support, the moving piece is movably installed on support, and the rotating piece is connected with the support linkage;Rotating the rotating piece, drive the support to rotate, the moving piece moves up and down along the support under the rotation of the support, and extrudes the spring;The spring structure solves the existing spring cannot adjust spring pre-tightening force, the soft and hard degree cannot be adjusted when using, the problem of single function, has industrial practicability.

Claims

1. A spring structure of adjustable stiffness, characterized by: The spring structure comprises a spring, an adjusting member and a covering member, the covering member is used for wrapping the spring, and the adjusting member is used for adjusting the pre-tightening force of the spring; The adjusting member is arranged at one end of the spring and is used for pressing the spring; the adjusting member comprises a rotating member, a moving member and a supporting member, the moving member is movably arranged on the supporting member, and the rotating member is connected with the supporting member in linkage; The rotating member is rotated to drive the supporting member to rotate, and the moving member moves up and down along the supporting member under the rotation of the supporting member and presses the spring.

2. A spring structure of adjustable stiffness according to claim 1, characterized in that: The supporting member comprises a threaded rod, and the threaded rod is connected with the rotating member; the moving member is screw-connected on the threaded rod.

3. A spring structure of adjustable stiffness according to claim 2, characterized in that: The supporting member comprises a guide rod, and the moving member comprises an end face used for pressing the spring; The guide rod is arranged at the side of the threaded rod, the end face of the moving member is provided with a guide hole, and the guide rod is arranged in the guide hole.

4. A spring structure of adjustable stiffness according to claim 3, characterized in that: Four guide rods are arranged at the circumferential side of the threaded rod at equal intervals.

5. A spring structure of adjustable stiffness according to claim 4, characterized in that: The rotating member is arranged at the top of the covering member, the rotating member is provided with a plug, the threaded rod is provided with a socket, and the plug is inserted into the socket.

6. A spring structure of adjustable stiffness according to claim 5, characterized in that: The covering member comprises a cloth cover, an inner pressing cover and an outer pressing cover; the spring is arranged in the cloth cover, and the inner pressing cover and the outer pressing cover are sequentially assembled and fixed to the spring in the cloth cover; The threaded rod passes through the outer pressing cover and the inner pressing cover and is arranged in the cloth cover, the guide rod is fixed to the upper portion of the inner pressing cover, and the rotating member is arranged above the outer pressing cover.

7. A spring structure of adjustable stiffness according to claim 3, characterized in that: The moving member is a push cover, one side of the push cover, which presses the spring, is provided with an annular groove, and one end of the spring is clamped in the annular groove.

8. A spring structure of adjustable stiffness according to claim 3, characterized in that: The length of the threaded rod is at least one third of the overall length of the spring structure.

9. A spring wrap characterized by: The spring structure comprises a spring, an adjusting member and a covering member, the covering member is used for wrapping the spring, and the adjusting member is used for adjusting the pre-tightening force of the spring; 10. A spring wrap characterized by: The adjusting member is arranged at one end of the spring and is used for pressing the spring; the adjusting member comprises a rotating member, a moving member and a supporting member, the moving member is movably arranged on the supporting member, and the rotating member is connected with the supporting member in linkage; The rotating member is rotated to drive the supporting member to rotate, and the moving member moves up and down along the supporting member under the rotation of the supporting member and presses the spring. The supporting member comprises a threaded rod, and the threaded rod is connected with the rotating member; the moving member is screw-connected on the threaded rod. The supporting member comprises a guide rod, and the moving member comprises an end face used for pressing the spring; The guide rod is arranged at the side of the threaded rod, the end face of the moving member is provided with a guide hole, and the guide rod is arranged in the guide hole. Four guide rods are arranged at the circumferential side of the threaded rod at equal intervals. The rotating member is arranged at the top of the covering member, the rotating member is provided with a plug, the threaded rod is provided with a socket, and the plug is inserted into the socket. The covering member comprises a cloth cover, an inner pressing cover and an outer pressing cover; the spring is arranged in the cloth cover, and the inner pressing cover and the outer pressing cover are sequentially assembled and fixed to the spring in the cloth cover; The threaded rod passes through the outer pressing cover and the inner pressing cover and is arranged in the cloth cover, the guide rod is fixed to the upper portion of the inner pressing cover, and the rotating member is arranged above the outer pressing cover. The moving member is a push cover, one side of the push cover, which presses the spring, is provided with an annular groove, and one end of the spring is clamped in the annular groove. The length of the threaded rod is at least one third of the overall length of the spring structure.

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