Shock absorber

Abstract

The embodiment of the utility model provides a shock absorber which comprises a spring shock absorption assembly, and the top and the bottom of the spring shock absorption assembly are connected with a top plate and a bottom plate respectively. The spring vibration reduction assembly comprises an upper spring supporting seat, a lower spring supporting seat, a spring, a screw and a nut, the upper spring supporting seat is fixedly connected with the side, close to the bottom plate, of the top plate, a mounting hole is formed in the side, close to the top plate, of the bottom plate, one end of the screw is fixed in the mounting hole, and the nut is adjustably mounted on the screw. The spring lower supporting seat is arranged above the nut, and the two ends of the spring abut against the spring upper supporting seat and the spring lower supporting seat respectively. The shock absorber further comprises a rotation stopping structure, the rotation stopping structure is connected with the spring lower supporting seat, and / or the rotation stopping structure is connected with the spring upper supporting seat. The rotation stopping structure connected with the spring lower supporting seat and / or the spring upper supporting seat is additionally arranged, the lower end face or the upper end face of the spring is prevented from horizontally rotating in the vibration reduction process through the rotation stopping structure, and the vibration reduction effect is prevented from being affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vibration damper technical field, concretely relates to a vibration damper. BACKGROUND

[0002] With the continuous improvement of the precision of super-precision machining equipment and measuring instrument, the vibration of its working environment tends to be micro-amplitude and low-frequency, and thus more stringent requirements are put forward for the damping performance of the vibration damper. The existing vibration damper is usually a spring vibration damper. In the spring lifting process, the lower end face of the spring is prone to torsion, which affects the lifting of the spring and thus affects the overall damping effect. SUMMARY

[0003] The utility model discloses a vibration damper, which aims to solve the problem of torsion of the lower end face of the spring of the existing spring vibration damper, which affects the damping effect.

[0004] In a first aspect, the utility model provides a vibration damper, which comprises a top plate, a bottom plate and a spring damping assembly. The top plate and the bottom plate are arranged oppositely. The top and bottom parts of the spring damping assembly are connected with the top plate and the bottom plate respectively.

[0005] The spring damping assembly comprises a spring upper support seat, a spring lower support seat, a spring, a screw rod and a nut. The spring upper support seat is fixedly connected with the side of the top plate close to the bottom plate. The side of the bottom plate close to the top plate is formed with a mounting hole. One end of the screw rod is fixed in the mounting hole. The nut is adjustably installed on the screw rod. The two ends of the spring are respectively in abutment with the spring upper support seat and the spring lower support seat.

[0006] The vibration damper further comprises a rotation stopping structure, which is connected with the spring lower support seat and / or the spring upper support seat.

[0007] In some possible embodiments, the rotation stopping structure comprises a first locking structure and a second locking structure. The first locking structure is arranged above the spring lower support seat and in contact with the spring lower support seat. The first locking structure is sleeved outside the end of the spring directly contacting with the spring lower support seat. The second locking structure is arranged below the spring upper support seat and in contact with the spring upper support seat. The second locking structure is sleeved outside the end of the spring directly contacting with the spring upper support seat.

[0008] In some possible embodiments, the first locking structure and the second locking structure each comprise a first clamping hoop, a second clamping hoop, and a locking screw, the first clamping hoop and the second clamping hoop each comprise a convex portion and a locking portion, the first locking structure and the second locking structure are oppositely arranged, and the locking portion of the first clamping hoop and the locking portion of the second clamping hoop are locked by the locking screw.

[0009] In some possible embodiments, the rotation-stopping structure comprises a limiting bolt, a limiting bolt hole is formed on the spring lower support base, the limiting bolt hole penetrates through the spring lower support base in a direction perpendicular to the bottom plate, and the limiting bolt is inserted into the limiting bolt hole.

[0010] In some possible embodiments, the bottom plate comprises a limiting blind hole formed at a position corresponding to the limiting bolt hole on a surface of the spring lower support base, and the limiting bolt penetrates through the limiting bolt hole and is partially embedded in the limiting blind hole.

[0011] In some possible embodiments, the limiting bolt hole is a closed hole structure, and an edge of the limiting bolt hole is located within a range of a side edge of the spring lower support base perpendicular to the bottom plate.

[0012] In some possible embodiments, the limiting bolt hole is a U-shaped structure, and the limiting bolt hole is open toward a side edge of the spring lower support base perpendicular to the bottom plate.

[0013] In some possible embodiments, the rotation-stopping structure comprises a third locking structure and a limiting bolt, the third locking structure is arranged above the spring lower support base and in contact with the spring upper support base, and the third locking structure is sleeved outside an end of the spring directly in contact with the spring lower support base.

[0014] The spring lower support base comprises a limiting bolt hole, the limiting bolt hole penetrates through the spring lower support base in a direction perpendicular to the bottom plate, and the limiting bolt is inserted into the limiting bolt hole.

[0015] In some possible embodiments, the rotation-stopping structure comprises a fourth locking structure and a limiting bolt, the fourth locking structure is arranged above the spring lower support base and in contact with the spring lower support base, and the fourth locking structure is sleeved outside an end of the spring directly in contact with the spring lower support base.

[0016] The spring lower support base comprises a limiting bolt hole, the limiting bolt hole penetrates through the spring lower support base in a direction perpendicular to the bottom plate, and the limiting bolt is inserted into the limiting bolt hole.

[0017] In some possible embodiments, a protrusion is arranged on the outer side wall of the spring lower support seat, the rotation stopping structure comprises a U-shaped limiting block and a limiting screw, the U-shaped limiting block is open towards the bottom plate, and the U-shaped limiting block is fixedly connected with the bottom plate, and the protrusion is clamped in the U-shaped limiting block;

[0018] Two vertical side walls of the U-shaped limiting block are formed with sliding grooves, the limiting screw is clamped in the sliding grooves in a direction towards the protrusion, and the limiting screw can move up and down in the sliding grooves.

[0019] In some possible embodiments, the upper surface of the limiting bolt is flush with the side of the spring lower support seat away from the bottom plate, or the upper surface of the limiting bolt is protruded from the side of the spring lower support seat away from the bottom plate.

[0020] The utility model embodiment provides a shock absorber, including spring shock absorber subassembly, the top and bottom of spring shock absorber subassembly are connected with top plate and bottom plate respectively, spring shock absorber subassembly includes spring upper support seat, spring lower support seat, spring, screw rod and nut, spring upper support seat is fixedly connected with the side of top plate close to bottom plate, and the side of bottom plate close to top plate is formed with mounting hole, one end of screw rod is fixed in mounting hole, and nut can be adjusted and installed on screw rod, spring lower support seat is arranged above nut, and both ends of spring are respectively in contact with spring upper support seat and spring lower support seat, the shock absorber still includes rotation stopping structure, and the rotation stopping structure is connected with spring lower support seat, and / or the rotation stopping structure is connected with spring upper support seat, the utility model discloses by adding the rotation stopping structure connected with spring lower support seat and / or connected with spring upper support seat, utilizes the rotation stopping structure to avoid the horizontal rotation of spring lower end surface or upper end surface in the shock absorbing process, avoids the influence on the shock absorbing effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] The technical scheme and other beneficial effects of the utility model will be obvious by combining the specific embodiment of the utility model with the drawings.

[0022] Figure 1 An embodiment structure schematic view of the shock absorber provided by the utility model is shown in the figure.

[0023] Figure 2 An embodiment top view of the spring lower support seat provided by the utility model embodiment is shown in the figure.

[0024] Figure 3 Another embodiment structure schematic view of the rotation stopping structure provided by the utility model embodiment is shown in the figure. DETAILED DESCRIPTION

[0025] The utility model will be further described in detail below in combination with the drawings and embodiments. It is particularly pointed out that the following embodiments are only used for illustrating the utility model, but do not limit the scope of the utility model. Similarly, the following embodiments are only part of the embodiments of the utility model rather than all the embodiments, and all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0026] In the following description of the utility model, "some embodiments" are described, which describe a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subset of all possible embodiments, and can be combined with each other without conflict.

[0027] In the following description of the utility model, the terms "first, second and third" are only to distinguish similar objects, and do not represent the specific order of the objects. It can be understood that "first, second and third" can be interchanged in specific order or sequence as allowed, so that the utility model embodiments described here can be implemented in an order other than that illustrated or described here.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used herein are only for the purpose of describing the embodiments of the utility model, and are not intended to limit the utility model.

[0029] The following will be described in detail in combination with specific embodiments. It should be noted that the serial number of the following embodiments is not limited to the preferred order of the embodiments. The utility model provides a shock absorber, Figure 1 An embodiment structure diagram of the shock absorber provided by the utility model, Figure 2 An embodiment top view of the spring lower support seat provided by the utility model, which will be described in detail below in combination with the drawings.

[0030] In Figure 1 In the embodiment shown, the shock absorber comprises a top plate 10, a bottom plate 20 and a spring damping assembly 30, the top plate 10 and the bottom plate 20 are oppositely arranged, the top and bottom of the spring damping assembly 30 are connected with the top plate 10 and the bottom plate 20 respectively, and the spring damping assembly 30 is the main functional module for realizing damping. In Figure 2In the spring damping assembly 30, a spring upper support seat, a spring lower support seat 301, a spring 302, a nut 303, a Z-shaped connecting piece 304, and a screw rod are arranged in sequence from top to bottom.

[0031] When the damper is damping, the spring 302 in the spring damper will stretch and contract to achieve damping, and in the process of stretching and contracting of the spring 302, the spring 302 can rotate and drive the spring lower support seat 301 in direct contact with the spring to deviate.

[0032] The damper provided by the utility model further comprises a rotation stopping structure which is connected with the spring lower support seat and / or abuts against the spring upper support seat, can prevent the spring from horizontally rotating in the damping process, and can improve the structural stability and damping effect of the damper.

[0033] Please refer to Figure 1 and Figure 2 In the utility model, the rotation stopping structure can comprise a first locking structure 40 and a second locking structure 50, the first locking structure 40 is arranged above the spring lower support seat 301 and is in contact with the spring lower support seat 301, and the first locking structure 40 is sleeved outside one end of the spring 302 in direct contact with the spring lower support seat 301.

[0034] The first locking structure 40 and the second locking structure 50 are the same in structure, and the first locking structure 40 and the second locking structure 50 each comprise a first hoop, a second hoop and a locking screw; the first hoop and the second hoop each comprise a protruding part and a locking part, the first hoop and the second hoop are oppositely arranged, and the protruding part of the first hoop and the protruding part of the second hoop are away from each other, thereby forming a containing space, and the top and the bottom of the spring are arranged in the containing spaces formed by the first locking structure 40 and the second locking structure 50 respectively. Specifically, the right locking part of the second hoop and the right locking part of the second hoop are locked and connected through the locking screw; the left locking part of the first hoop and the left locking part of the second hoop are also locked and connected through the locking screw (the locking screw on the left is not shown in the figure). The locking part of the first hoop and the locking part of the second hoop are locked through the locking screw, and the spring lower support base 301 is further prevented from rotating. Specifically, when the first hoop and the second hoop are locked, since the lower end surface of the spring 302 directly contacts the first hoop and the second hoop, the lower end surface of the spring 302 is subjected to the pressure generated by the locking of the first hoop and the second hoop, so that the upper end surface and the lower end surface of the spring do not horizontally rotate in the damping process, thereby achieving the rotation stopping effect.

[0035] Please continue to refer to Figure 1 and Figure 2 The limiting bolt hole 3011 is formed in the spring lower support base 301 and penetrates the spring lower support base 301 in the direction perpendicular to the bottom plate 20, and the limiting bolt 60 is inserted into the limiting bolt hole 3011. When the shock absorber is in the damping process, the spring 302 will be lifted to achieve damping; and in the lifting process of the spring 302, the lower end surface of the spring 302 may be twisted, at this time, the spring lower support base 301 connected with the lower end surface of the spring 302 will also be rotated. The utility model forms the limiting bolt hole 3011 in the spring lower support base 301, and inserts the limiting bolt into the limiting bolt hole, so as to limit the horizontal rotation of the spring lower support base 301, avoid affecting the stability of the spring damping assembly, and avoid affecting the damping effect of the shock absorber.

[0036] In the embodiment of the utility model, the bottom plate 20 forms a limiting blind hole (not shown in the figure) on the surface close to the spring lower support seat 301 at the position corresponding to the limiting bolt hole 3011, the limiting blind hole is a hole with one end open and the other end closed, specifically, the opening is towards the upper surface of the bottom plate. The limiting bolt 60 is completely inserted into the limiting bolt hole 3011 and extends into the limiting blind hole on the bottom plate, thereby fixing the limiting bolt 60 and the bottom plate 20, avoiding the rotation of the limiting bolt 60 affected by the spring lower support seat 301. And in the actual shock absorber, the limiting bolt 60 needs to be connected with other functional modules to maintain stability, and cannot be independent of other functional modules; therefore, the limiting blind hole is arranged on the bottom plate 20 to fix the limiting bolt 60.

[0037] The utility model discloses a new stop rotation structure, and the stop rotation structure is connected with the spring lower support seat and / or the stop rotation structure is connected with the spring upper support seat, so as to prevent the spring lower support seat and / or the spring upper support seat from rotating horizontally in the damping process by the stop rotation structure, thereby improving the stability and damping effect of the shock absorber.

[0038] Figure 2 In the embodiment shown, the limiting bolt hole 3011 is located on the spring lower support seat, and the limiting bolt hole 3011 is a U-shaped structure; that is, the limiting bolt hole 3011 is open towards the side of the spring lower support seat 301 perpendicular to the bottom plate 20. In other embodiments, the limiting bolt hole 3011 can be a closed hole structure, and the edge of the limiting bolt hole 3011 is located within the range of the side of the spring lower support seat 301 perpendicular to the bottom plate 20. That is, the limiting bolt hole 3011 is located entirely inside the spring lower support seat 301. For this type of limiting bolt hole, in the direction perpendicular to the bottom plate 20, the orthographic projection of the limiting bolt hole 3011 can be oval (including circular), triangular or rectangular, etc.

[0039] In the above embodiment, regardless of the specific structure of the limiting bolt hole 3011, the limiting bolt hole 3011 needs to penetrate the spring lower support seat 301 in the vertical direction, and the limiting bolt 60 needs to be completely inserted into the limiting bolt hole 3011. And since the lower surface of the spring lower support seat 301 does not directly contact the bottom plate 20, the limiting bolt 60 also needs to be further extended until it is embedded in the limiting blind hole on the bottom plate 20. In this way, when the spring damping assembly damps and the spring is lifted, the limiting bolt 60 can play a limiting role, the spring lower support seat 301 will not be twisted, and the damping effect is guaranteed.

[0040] The limiting bolt 60 in the utility model usually needs to penetrate the limiting bolt hole and embed into the limiting blind hole inside the bottom plate 20 at the same time; therefore, the length of the limiting bolt 60 usually needs to be greater than the sum of the distance between the side of the spring lower support seat 301 far away from the bottom plate and the bottom plate 20 and the depth of the limiting blind hole. The upper surface of the limiting bolt 60 can be flush with the side of the spring lower support seat far away from the bottom plate, or the upper surface of the limiting bolt 60 is convex on the side of the spring lower support seat far away from the bottom plate.

[0041] The limiting bolt hole 3011 in the utility model can be multiple, the sizes of the multiple limiting bolt holes 3011 are same, and the multiple limiting bolt holes are uniformly distributed along the edge of the spring lower support seat 301. Correspondingly, the limiting bolt 60 is also multiple, the multiple limiting bolts 60 are respectively inserted into different limiting bolt holes 3011; and the limiting blind hole is also multiple, different limiting bolt holes need to be respectively embedded into different limiting blind holes. The number of the limiting bolts, the number of the limiting bolt holes and the number of the limiting blind holes in the utility model are same.

[0042] In the above embodiment, the rotation stopping structure simultaneously comprises the first locking structure, the second locking structure and the limiting bolt; while in some other embodiments, the rotation stopping structure can only comprise the limiting bolt 60, at this time, the limiting bolt hole is formed on the spring lower support seat 301, and the limiting bolt 60 penetrates the spring lower support seat 301 and is inserted into the limiting bolt hole. Similarly, in some other embodiments, the rotation stopping structure can comprise the fourth locking structure and the limiting bolt, the fourth locking structure is arranged above the spring lower support seat and contacts the spring lower support seat, the fourth locking structure is sleeved outside the end of the spring directly contacting the spring lower support seat; the limiting bolt hole is formed on the spring lower support seat, in the direction perpendicular to the bottom plate, the limiting bolt hole penetrates the spring lower support seat, and the limiting bolt is inserted into the limiting bolt hole. In some other embodiments, the rotation stopping structure comprises the fourth locking structure and the limiting bolt, the fourth locking structure is arranged above the spring lower support seat and contacts the spring lower support seat, the fourth locking structure is sleeved outside the end of the spring directly contacting the spring lower support seat; the limiting bolt hole is formed on the spring lower support seat, in the direction perpendicular to the bottom plate, the limiting bolt hole penetrates the spring lower support seat, and the limiting bolt is inserted into the limiting bolt hole. That is, in the embodiment of the utility model, the rotation stopping structure can simultaneously comprise multiple locking structures and limiting bolts, can only comprise multiple locking structures, can only comprise limiting bolts, or comprise one locking structure and limiting bolt.

[0043] In the utility model, the damper can further include a limiting block, the limiting block is arranged on one side of the bottom plate 20 close to the spring lower support seat 301, and the limiting block needs to be arranged around the limiting blind hole; usually, the limiting block is arranged at the edge position of the limiting blind hole. In this way, when the limiting bolt 60 is offset in the limiting blind hole, the limiting block can further block the limiting bolt 60 to limit the limiting bolt 60, thereby limiting the spring lower support seat 301. The limiting block in the utility model can be multiple and arranged around different limiting blind holes (or limiting bolts 60) respectively to further limit different limiting bolts. Specifically, when the limiting blind hole is one, the limiting block can be multiple, and the multiple limiting blocks can be arranged around the limiting blind hole to further limit the limiting bolt at different angles in the horizontal direction. When the limiting blind hole is multiple, the limiting block can also be multiple, and one or more limiting blocks can be arranged around each limiting blind hole for limiting. The number of the limiting block in the utility model is not less than the number of the limiting blind hole. Of course, in other embodiments, the depth of the limiting blind hole can be controlled to improve the limiting effect of the limiting bolt. For example, the depth of the limiting blind hole is 1 / 4, or 1 / 3, or 1 / 2 of the thickness of the bottom plate 20; as the depth of the limiting blind hole increases, the limiting effect of the limiting bolt also improves.

[0044] As shown in Figure 3 Another embodiment structure schematic view of the rotation stopping structure provided by the utility model is shown. In Figure 3 In the embodiment shown, the outer side wall of the spring lower support seat 301 is provided with a protrusion 3012, and the protrusion 3012 is located on the same plane as the spring lower support seat 301; the rotation stopping structure includes a U-shaped limiting block 701 and a limiting screw 702, the U-shaped limiting block 701 faces the bottom plate opening and is fixedly connected with the bottom plate, and the protrusion 3012 is clamped in the U-shaped limiting block 701. When the U-shaped limiting block 701 is fixedly connected with the bottom plate and the protrusion 3012 is clamped in the U-shaped limiting block 701, if the spring lower support seat 301 is twisted, the two vertical side walls of the U-shaped limiting block 701 will block the protrusion 3012 from twisting to realize the limiting function of the spring lower support seat 301. Meanwhile, sliding grooves 703 are formed on the two vertical side edges of the U-shaped limiting block 701, and the limiting screw 702 is clamped in the sliding grooves 703 in the direction towards the protrusion 3012; when the limiting screw 702 is locked, the protrusion 3012 can be tightly attached to the vertical side wall of the U-shaped limiting block 701, thereby locking the protrusion 3012 and the U-shaped limiting block 701, and avoiding the separation of the protrusion 3012 and the U-shaped limiting block 701. The limiting screw 702 can also move up and down in the sliding groove, so that when the spring damper is damped and the spring lower support seat is displaced up and down, the limiting screw 702 can still lock the protrusion 3012 and the U-shaped limiting block.

[0045] The shock absorber provided by the utility model is characterized in that the spring damping assembly is located at the central region of the shock absorber, and it is not necessary to separately arrange spring damping assemblies at the four corner positions of the shock absorber; the shock absorber has a relatively small overall size.

[0046] It should be noted that, for the shock absorber provided by the utility model embodiment, the shock absorber needs to be debugged after being prepared; in the debugging process, the lower end face of the spring can be locked by the locking structure to prevent the spring from rotating horizontally, and the lower support seat of the spring can be further limited by the limiting bolt.

[0047] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0048] The above only describes the preferred embodiments of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model. The above only describes the preferred embodiments of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A damper characterized by, The damper comprises a top plate, a bottom plate and a spring damping assembly, the top plate and the bottom plate are oppositely arranged, and the top and bottom of the spring damping assembly are connected with the top plate and the bottom plate respectively; The spring damping assembly comprises a spring upper support seat, a spring lower support seat, a spring, a screw rod and a nut, the spring upper support seat is fixedly connected with the top plate on the side close to the bottom plate, the bottom plate is formed with a mounting hole on the side close to the top plate, one end of the screw rod is fixed in the mounting hole, the nut is adjustably mounted on the screw rod, the spring lower support seat is arranged above the nut, and the two ends of the spring are respectively in abutment with the spring upper support seat and the spring lower support seat. The damper further comprises a rotation stopping structure, the rotation stopping structure is connected with the spring lower support seat, and / or the rotation stopping structure is connected with the spring upper support seat.

2. The damper of claim 1, wherein The rotation stopping structure comprises a first locking structure and a second locking structure, the first locking structure is arranged above the spring lower support seat and in contact with the spring lower support seat, the first locking structure is sleeved outside one end of the spring directly in contact with the spring lower support seat, the second locking structure is arranged below the spring upper support seat and in contact with the spring upper support seat, and the second locking structure is sleeved outside one end of the spring directly in contact with the spring upper support seat.

3. The damper of claim 2, wherein The first locking structure and the second locking structure each comprise a first hoop, a second hoop and a locking screw, the first hoop and the second hoop each comprise a protruding portion and a locking portion, the first locking structure and the second locking structure are oppositely arranged, and the locking portion of the first hoop and the locking portion of the second hoop are locked by the locking screw.

4. The damper of claim 1, wherein The rotation stopping structure comprises a limiting bolt, the spring lower support seat is formed with a limiting bolt hole, and the limiting bolt hole penetrates through the spring lower support seat in a direction perpendicular to the bottom plate.

5. The damper of claim 4, wherein The limiting bolt is inserted into the limiting bolt hole.

6. The damper of claim 5, wherein The bottom plate is formed with a limiting blind hole at a position corresponding to the limiting bolt hole on a surface close to the spring lower support seat, the limiting bolt penetrates through the limiting bolt hole and is partially embedded in the limiting blind hole.

7. The damper of claim 5, wherein The limiting bolt hole is a closed hole structure, and the edge of the limiting bolt hole is located within the range of the side edge of the spring lower support seat perpendicular to the bottom plate.

8. The damper of claim 1, wherein The limiting bolt hole is a U-shaped structure, and the limiting bolt hole is open toward the side edge of the spring lower support seat perpendicular to the bottom plate. The rotation stopping structure comprises a third locking structure and a limiting bolt, the third locking structure is arranged above the spring lower support seat and in contact with the spring upper support seat, and the third locking structure is sleeved outside one end of the spring directly in contact with the spring lower support seat. The spring lower support seat is formed with a limiting bolt hole, and the limiting bolt hole penetrates through the spring lower support seat in a direction perpendicular to the bottom plate. The limiting bolt is inserted into the limiting bolt hole.

9. The damper of claim 1, wherein The outer side wall of the spring lower support seat is provided with a protrusion, the rotation stopping structure comprises a U-shaped limiting block and a limiting screw, the U-shaped limiting block faces the bottom plate opening and is fixedly connected with the bottom plate, and the protrusion is clamped in the U-shaped limiting block; Two vertical side walls of the U-shaped limiting block are formed with sliding grooves, the limiting screw is clamped in the sliding grooves in a direction towards the protrusion, and the limiting screw can move up and down in the sliding grooves.

10. A damper according to any one of claims 4-8, characterised in that The upper surface of the limiting bolt is flush with the side of the spring lower support seat away from the bottom plate, or the upper surface of the limiting bolt is protruded from the side of the spring lower support seat away from the bottom plate.

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