Spring buffer fixing structure and impact test equipment

Abstract

The utility model discloses a spring buffer fixing structure and an impact test device, and relates to the technical field of spring test.The spring buffer fixing structure comprises a base, a plurality of abutting portions, a synchronous piece and a driving piece, the abutting portions are arranged at intervals in the circumferential direction of the base, and the synchronous piece is arranged on the base. Each abutting part is provided with an inner end facing the middle of the base and an outer end opposite to the inner end, a clamping space is defined between the inner ends of the abutting parts and used for clamping the spring buffer, the abutting parts are linearly and movably installed on the base in the inward-outward direction, and at least one of the abutting parts is arranged to be a driving abutting part. According to the technical scheme, the linkage structure is adopted, and in the actual operation process, the good fixing effect on various different types of elevator volute spiral spring buffers can be achieved. And therefore, the convenience and the safety of fixing the volute spiral spring buffer of the elevator are improved to a certain extent.

Description

TECHNICAL FIELD

[0001] The utility model relates to spring test technical field, especially a kind of spring bumper fixed structure and impact test equipment. BACKGROUND

[0002] Elevator scroll spiral spring buffer is a common elevator safety device, mainly used to slow down the impact force of elevator car when elevator falls or hits the top accident, protect the life safety of passengers. Before installing and using elevator scroll spiral spring buffer, it needs to be impact tested. At present, on the impact equipment, corresponding carrier needs to be used to first fix and install elevator scroll spiral spring buffer, and the traditional buffer has multiple different specifications, and generally when experiment is carried out, temporarily adopt cross clamping the lower end of buffer, then the clamping bar is fixed on the base. This fixing mode needs to manually install multiple cross bars. When a large number of different specifications of scroll spiral buffer products need to be tested, the products need to be frequently replaced and reinstalled, which is time-consuming and laborious, and sometimes it will affect the test results. If the horizontal plate is not installed in place, elevator scroll spiral spring buffer may even fly out horizontally after being impacted, causing harm to nearby people or equipment, so this traditional fixing mode is not only not convenient but also poor in safety. SUMMARY

[0003] The main purpose of the utility model is to provide a spring buffer fixing structure, which aims to solve the problem of traditional elevator scroll spiral spring buffer fixing device, which is not only inconvenient and poor in safety during use.

[0004] To achieve the above purpose, the spring buffer fixing structure provided by the utility model comprises:

[0005] A base;

[0006] A plurality of abutting portions are arranged at intervals along the circumference of the base, each abutting portion has an inner end facing the middle of the base and an outer end opposite the inner end, and a clamping space is defined between the inner ends of the plurality of abutting portions to clamp the spring buffer, each abutting portion is linearly movably mounted on the base, and at least one of the plurality of abutting portions is provided as a driving abutting portion.

[0007] A synchronizing member is connected to the plurality of abutting portions to synchronize the movement of the plurality of abutting portions; and

[0008] A driving member is used to drive the driving abutting portion to move linearly.

[0009] In an embodiment, a first convex shaft portion is provided on the upper end surface of each abutting portion.

[0010] The synchronizer is provided as a ring-shaped member, a plurality of guide grooves are provided on the ring-shaped member, a plurality of first convex shafts are respectively arranged in the plurality of guide grooves, and an oblique included angle is formed between the extension direction of the plurality of guide grooves and the radial direction of the ring-shaped member.

[0011] In an embodiment, a plurality of limiting rotating shaft portions are arranged on the base and are arranged at intervals along the circumferential direction of the base, and are arranged to roll against the outer side surface of the ring-shaped member.

[0012] In an embodiment, the limiting rotating shaft portion is adjustable in the radial position of the ring-shaped member; and / or,

[0013] The limiting rotating shaft portion comprises a shaft body and a bearing arranged on the shaft body, and the outer ring of the bearing rolls against the outer side surface of the ring-shaped member.

[0014] In an embodiment, a sliding groove portion is formed on the base and extends along the inner-outer direction to cooperate with a cooperating portion arranged at the lower end of the abutting portion, and the synchronizer is connected to the upper end of the plurality of abutting portions.

[0015] In an embodiment, the base comprises a seat body and a limiting plate, a sunken groove is formed on the seat body, the limiting plate covers the upper opening of the sunken groove, and the sliding groove portion is defined between the seat body and the limiting plate.

[0016] In an embodiment, the driving abutting portion is provided with a threaded hole;

[0017] The driving member comprises:

[0018] A mounting seat is arranged on the base, and a limiting portion is arranged on the mounting seat; and,

[0019] A threaded rod is arranged to rotate along the axis extending in the inner-outer direction, the limiting portion limits the linear movement of the threaded rod in the inner-outer direction, and the threaded end of the threaded rod is screwed into the threaded hole of the driving abutting portion.

[0020] In an embodiment, the position of the mounting seat in the inner-outer direction is adjustable; and / or,

[0021] The mounting seat, the threaded rod, and the driving abutting portion are arranged one-to-one as a driving group, and a plurality of driving groups are arranged; and / or,

[0022] The end portion of the threaded rod is provided with a handle.

[0023] In an embodiment, the base comprises a base body and a bottom plate arranged above the base body, a spacing between the base body and the bottom plate is adjustable, and a plurality of the abutting portions are arranged on the bottom plate; and / or,

[0024] The spring buffer fixing structure further comprises an inner limiting shaft portion arranged in the clamping space, and configured to be sleeved in the spring buffer.

[0025] The utility model also includes a kind of impact test equipment, and the impact test equipment includes spring buffer fixing structure, and the spring buffer fixing structure includes:

[0026] Base;

[0027] A plurality of abutting portions are arranged at intervals along the circumference of the base, each of the abutting portions has an inner end towards the middle of the base and an outer end opposite to the inner end, a clamping space is defined between the inner ends of the plurality of abutting portions to clamp the spring buffer, each of the abutting portions is linearly movably mounted on the base, and at least one of the plurality of abutting portions is arranged as a driving abutting portion.

[0028] A synchronizing member is connected to the plurality of abutting portions to synchronously move the plurality of abutting portions; and

[0029] A driving member is configured to drive the driving abutting portion to move linearly.

[0030] In the technical solution of the utility model, the linkage structure is arranged, in actual operation, the handle on one side of the entire base is rotated to drive the plurality of clamping blocks to move along the radial direction of the annular member at the same time, so that the plurality of clamping blocks simultaneously fix and release the lower end of the elevator scroll spiral spring buffer. The plurality of clamping blocks in the present solution have a movement stroke along the radial direction of the annular member, and in actual use, the plurality of clamping blocks can be used to fix different types of elevator scroll spiral spring buffers. The convenience and safety of fixing the elevator scroll spiral spring buffer are improved to some extent, and the versatility of the entire device is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained from the structures shown in the drawings without creative labor for those skilled in the art.

[0032] Figure 1A schematic diagram of the overall structure of the spring buffer fixing structure provided by this utility model;

[0033] Figure 2 for Figure 1 The schematic diagram of the spring buffer fixing structure provided does not include the ring-shaped component;

[0034] Figure 3 for Figure 2 Enlarged structural diagram at point A;

[0035] Figure 4 for Figure 2 The structural diagram does not include some mounting blocks, driving components, and driving clamping parts;

[0036] Figure 5 for Figure 4 Enlarged structural diagram at point B;

[0037] Figure 6 for Figure 1 A schematic diagram of the bottom structure of the spring buffer fixing structure provided in the diagram;

[0038] Figure 7 for Figure 1 Schematic diagram of the middle ring component;

[0039] Figure 8 for Figure 1 A schematic diagram of the structure of the middle clamping part including a through hole;

[0040] Figure 9 for Figure 1 A schematic diagram of the structure of the middle clamping part including the threaded hole.

[0041] Explanation of icon numbers:

[0042] 1. Spring buffer fixing structure; 2. Base; 21. Base body; 211. First elongated hole; 22. Base plate; 23. Fixing plate; 231. Second elongated hole; 24. Fixing bolt; 3. Clamping part; 31. Clamping block; 311. First protrusion; 312. Second protrusion; 313. Through hole; 32. Connecting block; 321. Threaded hole; 322. Adjusting nut; 33. First convex shaft part; 4. Ring-shaped part; 41. Guide groove; 5. Driving part; 51. Mounting seat; 511. Limiting part; 52. Threaded rod; 53. Handle; 6. Limiting rotating shaft part; 61. Shaft body; 62. Bearing; 63. Mounting groove; 64. Mounting block; 65. Screw; 66. Elongated hole; 67. Guide pin; 7. Sliding groove part; 71. Sinking groove; 72. Limiting plate; 8. Clamping space.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0045] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] Elevator scroll spring buffers are common elevator safety devices, primarily used to mitigate the impact of elevator car crashes or overshoots, protecting passenger safety. Before installation and use, impact resistance testing is necessary. Currently, impact testing requires the use of a suitable carrier to secure the buffer. Traditional buffers come in various specifications, and during testing, a temporary clamp is used to horizontally clamp the buffer's downward end before fixing it to the base. This method requires manually installing multiple horizontal clamps. When testing large quantities of different specifications of scroll spring buffers, frequent replacement and reinstallation are necessary, which is time-consuming and labor-intensive, and can sometimes affect test results. If the horizontal clamps are not properly installed, the buffer may even fly out laterally after impact, injuring nearby people or equipment. Therefore, this traditional fixing method is not only inconvenient but also unsafe.

[0048] This utility model proposes a spring buffer fixing structure 1 to solve the above problems.

[0049] Please see Figures 1 to 9 In one embodiment of this utility model, the spring buffer fixing structure 1 can effectively fix the elevator spiral spring buffer, and compared with the traditional fixing structure, it has a significant improvement in terms of operation convenience and fixing stability. Specifically, the spring buffer fixing structure 1 includes a base 2, multiple clamping parts 3, a synchronizing member and a driving member 5. The upper end surface of the base 2 is the specific structural mounting surface. The multiple clamping parts 3 are evenly spaced around the center of the upper end surface of the base 2, and the inner end positions of the multiple clamping parts 3 corresponding to the center of the upper end surface of the base 2 together define the clamping space 8. It should be noted that the inner end and outer end of the clamping part 3 correspond to the inward end facing the clamping space 8 on the horizontal plane and the outward end away from the clamping space 8, that is, the inward and outward directions. When actually fixing the elevator spiral spring buffer, the downward-facing end of the buffer can be placed in the clamping space 8. The driving component 5 drives a connected driving grounding part to move. When the driving grounding part moves, it simultaneously drives the synchronizing component to rotate on the upper surface of the base 2. The synchronizing component connects to multiple abutting parts 3. Therefore, during the rotation of the synchronizing component, multiple abutting parts 3 move simultaneously towards the center of the upper surface of the base 2. Finally, the inner ends of the multiple abutting parts 3 simultaneously clamp and fix the downward-facing end of the elevator spiral spring buffer. By fixing the elevator spiral spring buffer using the above structure, in specific operations, one driving component 5 can drive multiple abutting parts 3 to move simultaneously, thereby quickly fixing and releasing the buffer. The overall operation is much more convenient. Furthermore, the simultaneous circumferential fixing of the buffer by multiple abutting parts 3 effectively improves the fixing stability. Compared to the traditional method of installing the buffer end using multiple clamps, its convenience and safety are greatly enhanced.

[0050] Specifically, the synchronizing element is a ring-shaped element 4. When fixing the buffer, the downward end of the buffer first passes through the central hole of the ring-shaped element 4 and is then placed in the clamping space 8 on the base 2. When the ring-shaped element 4 rotates, the guide groove 41 can apply force to the first convex shaft 33. At the same time, because there is an inclined angle between the extension direction of the guide groove 41 and the radial direction of the ring-shaped element 4, the anvil 3 will tend to move towards the clamping space 8 and towards the circumferential direction of the base 2 during the rotation of the ring-shaped element 4. Since the anvil 3 is installed on the base 2 in a straight line in the inward and outward direction, the anvil 3 will move in a straight line in the inward and outward direction during the rotation of the ring-shaped element 4, thereby realizing the fixing and release of the buffer. It is conceivable that the tilting direction of the multiple guide grooves 41 should be tilted in one direction at the same time, so that during the rotation of the annular member 4, the multiple abutting parts 3 can move towards or away from each other at the same time. The size of the tilting angle should be set at an acute angle with the radial direction of the annular member 4. Generally speaking, the tilting angle is set at about 45° to ensure the movement efficiency of the multiple abutting parts 3 and to better reduce the resistance during the rotation of the annular member 4.

[0051] As described above, the annular member 4 is installed on the upper surface of the base 2. Since the central hole of the annular member 4 needs to accommodate a buffer, in order not to affect the fixation of the buffer, in this embodiment, multiple limiting pivot parts 6 are provided on the upper surface of the base 2 corresponding to the circumferential position of the annular member 4. During installation, the annular member 4 is installed in the middle of the multiple limiting pivot parts 6, and the annular member 4 can rotate between the multiple limiting pivot parts 6. Specifically, in order to minimize the friction between the annular member 4 and the limiting shaft 6, thereby making the rotation of the annular member 4 smoother, the limiting shaft 6 is specifically configured as two parts in this solution. The shaft body 61 is arranged vertically, and a bearing 62 is provided on the shaft body 61. When the annular member 4 rotates, because the outer wall of the bearing 62 abuts against the arc-shaped outer wall of the annular member 4, the inner and outer rings of the bearing 62 can rotate, thereby minimizing the resistance encountered by the annular member 4 during rotation.

[0052] Meanwhile, considering that only the combined limiting effect of multiple shaft bodies 61 can guarantee the installation effect of the annular member 4, in order to avoid the bearing 62 failing to form a good contact effect with the annular member 4, thereby causing vibration during the rotation of the annular member 4, in this embodiment, the shaft body 61 and the base 2 are relatively separated, thereby realizing the adjustment of the position of the shaft body 61. Specifically, a mounting groove 63 extending radially along the annular member 4 is provided on the upper surface of the base 2. A mounting block 64 is fixed inside the mounting groove 63 by a screw 65. In order to enable the mounting block 64 to move radially along the annular member 4 within the mounting groove 63 by turning the screw 65, a guide structure is provided between the mounting block 64 and the base 2. The guide structure includes two elongated holes 66 on the mounting block 64 along the direction of the annular member 4, and two guide pins 67 on the base 2 in the vertical direction. When the screw 65 is turned, the screw 65 can drive the mounting block 64 to move toward the annular member 4. During this process, the elongated holes 66 and the guide pins 67 cooperate to guide the movement, so that all the bearings 62 can maintain good contact with the annular member 4, and minimize vibration during the rotation of the annular member 4. Furthermore, to further ensure the limiting effect on the annular member 4, at least two shaft bodies 61 are provided on the upper surface of one of the mounting blocks 64. Through the above structural arrangement, the position of the annular part can be adjusted by adjusting the positions of the multiple mounting blocks 64, so that the center of the annular part corresponds as closely as possible to the clamping space 8 on the base 2.

[0053] For the installation of the abutment 3, a sliding groove 7 is provided on the base 2. The sliding groove 7 extends inward and outward, and the sliding groove 7 can first guide the movement of the abutment 3 in the radial direction of the annular member 4. In addition, the sliding groove 7 can limit the vertical direction of the abutment 3. Specifically, the base 2 includes a base body 21 and a limiting plate 72. A recessed groove 71 is formed on the base body 21. The limiting plate 72 covers the upper opening of the recessed groove 71. The sliding groove 7 is limited between the base body 21 and the limiting plate 72.

[0054] At least one of the plurality of abutting parts 3 is a driving abutting part 3. Considering that after the entire spring buffer fixing structure 1 is installed in a designated position, there may be a situation where the space on one or several sides of the spring buffer fixing structure 1 is limited, making it inconvenient to operate in that direction. Therefore, in this solution, all of the plurality of abutting parts 3 are configured as structural components that can be installed in conjunction with the driving member 5, and the driving member 5 can selectively connect to any of the abutting parts 3.

[0055] Specifically, the drive clamping part 3 is provided with a threaded hole 321. The handle 53 drives the threaded rod 52 to rotate in the limiting part 511 on the mounting base 51, thereby driving the clamping part 3 to slide in the sinking groove 71.

[0056] It is known that during the rotation of the annular member 4, multiple clamping parts 3 can simultaneously fix the spring buffer. During the rotation of the annular member 4, the stroke of multiple clamping parts 3 is the same. However, if the initial positions of multiple clamping parts 3 are different, the force exerted when multiple clamping parts 3 contact the spring buffer will be different. Furthermore, the multiple clamping parts 3 will change the specific anti-buffer position of the spring buffer to a certain extent during the application of force. In order to ensure that multiple clamping parts 3 apply the same downward pressure to the spring buffer, thereby ensuring the stability of the fixed position of the spring buffer, an adjusting nut 322 is provided at the end of the clamping part 3 away from the clamping space 8. One end of the adjusting nut 322 abuts against one end of the mounting base 51. By rotating the adjusting nut 322, the distance between the clamping part 3 and the mounting base 51 can be adjusted, thereby adjusting multiple clamping parts 3 to the same position in multiple sinkholes 71.

[0057] In this embodiment, the clamping part 3 is configured as a clamping block 31 and a connecting block 32. The connecting block 32 is located at the end of the clamping block 31 away from the clamping space 8. The adjusting nut 322 and the threaded hole 321 are both located on the connecting block 32, and the clamping block 31 has a through hole 313 corresponding to the threaded rod 52. The end of the clamping block 31 corresponding to the clamping space 8 is arc-shaped, and a first protrusion 311 extends downward from this end. One side of the first protrusion 311 corresponds to one end wall of the recessed groove 71, and the first protrusion 311 can limit the movement of the clamping block 31 inward and upward. A second protrusion 312 extends outward from the horizontal side of the clamping block 31, and the lower end face of the limiting plate 72 contacts the upper end face of the second protrusion 312, thereby limiting the vertical direction of the clamping block 31. The first convex shaft portion 33 is disposed on the connecting block 32. In actual installation, the first convex shaft portion 33 can also be disposed on the clamping block 31. In order to reduce the friction between the first convex shaft portion 33 and the guide groove 41, a bearing 62 is also provided on the first convex shaft portion 33. The outer wall of the bearing 62 is in contact with the inner wall of the guide groove 41, so that the annular member 4 can better drive the multiple clamping blocks 31 to move simultaneously.

[0058] In this embodiment, the base 2 is configured as two parts. A base plate 22 is located at the upper end of the base body 21 and is fixed by a fixing structure. Multiple abutment parts 3 and multiple mounting blocks 64 are all located on the base plate 22. Separating the base plate 22 from the base body 21 allows for adjustment of the relative positions of relevant structures on the base plate 22 with respect to the base body 21 via the fixing structure. This improves the flexibility of the entire structure during actual use. Specifically, a plurality of first elongated holes 211 are provided on the upper end surface of the base body 21, and a mounting round hole (not shown in the figure) is provided on the base plate 22. One end of the fixing bolt 24 passes through the mounting round hole and the first elongated hole 211 from top to bottom and is located below the upper end surface of the base body 21. A plurality of fixing plates 23 are provided at the lower position of the upper end of the base body 21 corresponding to the plurality of first elongated holes 211. A plurality of second elongated holes 231 are provided on the fixing plates 23 corresponding to the plurality of first elongated holes 211. The downward end of the fixing bolt 24 passes through the second elongated hole 231 and is fixed by a nut, thereby connecting the base plate 22, the base body 21 and the fixing plate 23 into a whole. Due to the above-mentioned elongated holes, the position of the base plate 22 can be adjusted on the base body 21. In actual use, it can be adjusted according to the actual situation.

[0059] This solution also discloses an impact testing device, which includes a spring buffer fixing structure 1. The specific structure of the spring buffer fixing structure 1 is as described in the above embodiments. Since the impact testing device adopts all the technical solutions in the above embodiments, it has all the beneficial effects of the above embodiments, which will not be repeated here.

[0060] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A spring buffer fixing structure, characterized in that, include: Base; Multiple abutments are spaced apart circumferentially along the base. Each abutment has an inner end facing the center of the base and an outer end opposite to the inner end. A clamping space is defined between the inner ends of the multiple abutments for clamping a spring buffer. Each abutment is movably mounted on the base in a straight line in the inward and outward directions. At least one of the multiple abutments is configured as a driving abutment. A synchronizing element, connected to the plurality of said abutting parts, is used to cause the plurality of said abutting parts to move synchronously; and, A driving component is used to drive the driving abutment to move linearly.

2. The spring buffer fixing structure as described in claim 1, characterized in that, Each of the aforementioned abutting parts has a first convex shaft portion on its upper end surface; The synchronizing element is a ring-shaped element with multiple guide grooves. Multiple first convex shafts are respectively disposed in the multiple guide grooves. An inclined angle is formed between the extending direction of the multiple guide grooves and the radial direction of the ring-shaped element.

3. The spring buffer fixing structure as described in claim 2, characterized in that, The base is provided with a limiting pivot portion that is rotatably mounted along the vertical axis. Multiple limiting pivot portions are provided and spaced apart along the circumference of the base to roll against the outer side of the annular member.

4. The spring buffer fixing structure as described in claim 3, characterized in that, The radial position of the limiting pivot portion along the annular member is adjustable; and / or, The limiting pivot includes a shaft body and a bearing disposed on the shaft body, wherein the outer ring of the bearing rolls against the outer side of the annular member.

5. The spring buffer fixing structure as described in claim 1, characterized in that, A groove is formed on the base, the groove extending inward and outward to engage with a mating part located at the lower end of the abutment part, and the synchronizing member is connected to the upper end of the plurality of abutment parts.

6. The spring buffer fixing structure as described in claim 5, characterized in that, The base includes a base body and a limiting plate. A recessed groove is formed on the base body, and the limiting plate covers the upper opening of the recessed groove. The sliding groove is limited between the base body and the limiting plate.

7. The spring buffer fixing structure as described in claim 1, characterized in that, The drive abutment part is provided with a threaded hole; The driving component includes: A mounting base is disposed on the base, and the mounting base is provided with a limiting portion; and... A threaded rod is rotatably mounted along an axis extending inward and outward. The limiting part limits the linear movement of the threaded rod inward and outward. The threaded end of the threaded rod is threadedly installed in the threaded hole of the driving abutment part.

8. The spring buffer fixing structure as described in claim 7, characterized in that, The position of the mounting base along the inward and outward directions is adjustable; and / or, The mounting base, the threaded rod, and the drive abutment are each configured as a drive group, and multiple drive groups are provided; and / or, The threaded rod has a handle at its end.

9. The spring buffer fixing structure as described in claim 1, characterized in that, The base includes a seat body and a base plate disposed above the seat body. The distance between the seat body and the base plate is adjustable. A plurality of abutment portions are disposed on the base plate; and / or, The spring buffer fixing structure also includes an inner limiting shaft portion disposed within the clamping space, for fitting inside the spring buffer.

10. An impact testing apparatus, characterized in that, Includes the spring buffer fixing structure as described in any one of claims 1-9.

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