Floating fine trimming device for edge bonding machine

Abstract

The utility model discloses a floating fine trimming device for an edge banding machine, which comprises a support frame, a first floating module and a second floating module, the first floating module and the second floating module are respectively arranged on the upper side and the lower side of the support frame in a sliding way, a floating compensation component is arranged on the first floating module, and the floating compensation component comprises a support column rod, a fixed support plate and a shell frame, the fixed supporting plate is fixedly connected with the first floating module, the shell frame is installed on the fixed supporting plate, the shell frame and the fixed supporting plate jointly form a containing cavity, a movable part is installed in the containing cavity and can reciprocate in the longitudinal length direction of the containing cavity, and a first elastic part is arranged between the movable part and the shell frame. One end of the supporting column rod penetrates through the shell frame and is fixedly connected with the movable part, and the other end is hung on the edge sealing machine. Through the synergistic effect of the movable piece and the first elastic piece in the floating compensation component, a floating hoisting structure is formed, pressing force is adjusted in real time, vibration absorption and jumping reduction are achieved, structure looseness is compensated, and the machining precision and the yield are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of plate edge sealing, especially to a floating finishing device for an edge banding machine. BACKGROUND

[0002] In the field of modern plate furniture manufacturing, furniture products based on medium-density fiberboard, high-density fiberboard, shaving board and plywood and other artificial substrates have become the market mainstream due to their efficient processing performance and cost advantage. The edge sealing process of such plate materials, as a key link affecting the appearance quality and service life of furniture, is usually completed by automatic edge sealing equipment. However, the existing edge banding machine has significant defects in the structural design of the finishing unit. Specifically, traditional equipment generally uses screw spring compression components to achieve plate compression positioning. Although the initial compression force can be adjusted by threads, the threaded connection is prone to fatigue loosening under long-term high-frequency vibration conditions, resulting in compression force attenuation. This dynamic loosening not only increases the gap between the compression mechanism and the conveying guide rail, but also causes periodic micro-jitter of the plate during the finishing conveying process, and the amplitude fluctuation is directly mapped to the cutting trajectory of the edge trimming tool, ultimately forming a "wavy" defect between the edge sealing strip and the substrate. This problem is particularly prominent in thin plate materials and high-speed processing scenarios, which not only reduces product yield, but also increases repair costs and end-user quality complaints, severely restricting the market competitiveness of plate furniture manufacturing enterprises. SUMMARY

[0003] Therefore, the utility model provides a floating finishing device for an edge banding machine, which solves the technical problem of dynamic attenuation of the compression force of the traditional screw spring compression component under continuous vibration conditions, resulting in periodic micro-jitter of the plate during the conveying process and distortion of the edge trimming trajectory.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a floating finishing device for edge banding machine, including support frame, first floating module and second floating module, the support frame is fixed on the edge banding machine, first floating module and second floating module are slidably arranged on the upper and lower sides of support frame respectively, and can reciprocate along the longitudinal length direction of support frame, be equipped with floating compensation component on first floating module, floating compensation component includes support column, fixed support plate and shell frame, the fixed support plate is fixedly connected with first floating module, the shell frame is installed on fixed support plate, and with fixed support plate, the installation cavity is formed in common, the movable element is installed in the installation cavity, the movable element can reciprocate along the longitudinal length direction of installation cavity, be equipped with first elastic piece between movable element and shell frame, one end of support column passes shell frame and is fixedly connected with movable element, and the other end is hoisted on the edge banding machine.

[0006] As a preferred scheme, the end of the installation cavity away from the fixed support plate is also provided with an adjusting piece, the adjusting piece is adjustably installed on the shell frame and located between the shell frame and the first elastic piece, one end of the first elastic piece abuts against the movable element, and the other end abuts against the adjusting piece, and one end of the support column close to the second floating module passes the shell frame and the adjusting piece in sequence and is fixedly connected with the movable element.

[0007] As a preferred scheme, the shell frame is fixedly connected with the fixed support plate through fastening rod pieces, first avoiding through holes and second avoiding through holes corresponding to the fastening rod pieces are respectively formed in the adjusting piece and the movable element, a plurality of fastening rod pieces are distributed along the outer circumferential side of the support column, and the first elastic piece is installed on the fastening rod piece in a sleeved manner.

[0008] As a preferred scheme, the side of the adjusting piece away from the movable element is provided with an adjusting sleeve, an assembly through hole matched with the adjusting sleeve is formed in the shell frame, a locking through hole is also formed in the shell frame, the locking through hole is in communication with the assembly through hole and is arranged vertically, and a locking piece is installed on the locking through hole.

[0009] As a preferred scheme, waist-shaped through grooves are also formed in the symmetrical two sides of the shell frame, and scale lines are arranged on the sidewalls of the waist-shaped through grooves.

[0010] As a preferred scheme, the support frame comprises a vertical plate and a horizontal plate, the horizontal plate is arranged at two symmetrical ends of the vertical plate and is fixedly connected with the vertical plate, a guide column is arranged between the two horizontal plates, the guide column is arranged in parallel with the vertical plate, the first floating module and the second floating module are slidably installed on the guide column through a first sliding seat and a second sliding seat respectively, the first sliding seat is located above the second sliding seat, the first sliding seat and the second sliding seat can reciprocate along the axial length direction of the guide column, and one end of the support column away from the shell frame is fixedly connected with the edge sealing machine through a connecting member.

[0011] As a preferred scheme, the first and second sliding seats are respectively provided with first and second telescopic damping members on two symmetrical sides of the vertical plate, one end of the first telescopic damping member is connected with the vertical plate, the other end is connected with the first sliding seat, one end of the second telescopic damping member is connected with the vertical plate, the other end is connected with the second sliding seat, and the first and second sliding seats are respectively provided with first and second installation grooves on one side away from the guide column, and the first and second floating modules are respectively provided with first and second connecting seats on one side close to the guide column, the first connecting seat is embedded on the first installation groove and can reciprocate along the transverse length direction of the first installation groove, and the second connecting seat is embedded on the second installation groove and can reciprocate along the transverse length direction of the second installation groove.

[0012] As a preferred scheme, the first and second sliding seats are respectively provided with first and second telescopic damping members on two symmetrical sides of the vertical plate, one end of the first telescopic damping member is connected with the vertical plate, the other end is connected with the first sliding seat, one end of the second telescopic damping member is connected with the vertical plate, the other end is connected with the second sliding seat, and the first and second sliding seats are respectively provided with first and second installation grooves on one side away from the guide column, and the first and second floating modules are respectively provided with first and second connecting seats on one side close to the guide column, the first connecting seat is embedded on the first installation groove and can reciprocate along the transverse length direction of the first installation groove, and the second connecting seat is embedded on the second installation groove and can reciprocate along the transverse length direction of the second installation groove.

[0013] As a preferred scheme, the first and second connecting seats are respectively provided with first and second telescopic cylinders on the first and second fixed plates,

[0014] The transmission end of the telescopic cylinder is connected with the vertical plate, and the telescopic cylinder is used to drive the first and second connecting seats to reciprocate transversely.

[0015] As a preferred solution, the first mounting groove and the second mounting groove are respectively provided with a second elastic member and a third elastic member, the second elastic member is located between the first sliding seat and the first connecting seat, one end of the second elastic member is connected with the first sliding seat, and the other end is connected with the first connecting seat, the third elastic member is located between the second sliding seat and the second connecting seat, one end of the third elastic member is connected with the second sliding seat, and the other end is connected with the second connecting seat.

[0016] The utility model discloses have obvious advantage and beneficial effect compared with prior art, specifically speaking, from the above technical scheme can know, it mainly is through introducing first floating module and second floating module, and cooperate the synergetic effect of movable part and first elastic member in floating compensation component, form floating hoisting structure, real -time dynamic adjustment pressure and absorption vibration, reduced periodic micro -jitter in the plate conveying finishing process, effectively compensate the structure slack of long -term vibration, reduce the defect of trimming track distortion and edge bonding, significantly improve the machining precision and product yield.

[0017] In order to more clearly set forth the structural features and efficacy of the utility model, below, combining with the specific embodiment and the utility model are explained in detail. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the floating finishing device schematic diagram for edge banding machine of embodiment of the application;

[0019] Figure 2 It is the floating finishing device schematic diagram for edge banding machine of another perspective of embodiment of the application;

[0020] Figure 3 It is the structure exploded view of floating compensation component of embodiment of the application;

[0021] Figure 4 It is the structure exploded view of floating finishing device for edge banding machine of embodiment of the application;

[0022] Figure 5 It is the structure exploded view of another perspective of floating finishing device for edge banding machine of embodiment of the application.

[0023] BRIEF DESCRIPTION OF DRAWINGS

[0024] 10, support frame;11, vertical plate;111, first limit sliding groove;112, second limit sliding groove;12, horizontal plate;13, guide column rod;14, first telescopic damping member;15, second telescopic damping member;

[0025] 20, first floating module;21, first sliding seat;211, first mounting groove;212, second elastic member;22, first connecting seat;

[0026] 30, second floating module; 31, second sliding seat; 311, second mounting groove; 312, third elastic member; 32, second connecting seat;

[0027] 40, floating compensation member; 41, support column; 42, fixed support plate; 43, shell frame; 431, assembly through hole; 432, locking through hole; 433, waist-shaped through slot; 44, movable member; 441, second avoiding through hole; 45, first elastic member; 46, adjusting member; 461, first avoiding through hole; 462, adjusting sleeve; 47, fastening rod member;

[0028] 50, installation cavity;

[0029] 60, connecting member;

[0030] 70, first fixed plate; 71, first push rod;

[0031] 80, second fixed plate; 81, second push rod;

[0032] 90, telescopic air cylinder. DETAILED DESCRIPTION

[0033] In order to make the purpose of the utility model, technical scheme and advantage more clear and obvious, the utility model is further explained in detail below by combining with the drawings and implementation examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0034] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0035] Please refer to Figures 1 to 5The embodiment of the application provides a floating finishing device for an edge banding machine, which comprises a support frame 10, a first floating module 20 and a second floating module 30. The support frame 10 is fixedly arranged on the edge banding machine and is used for stably supporting the whole device and ensuring the machining precision. The first floating module 20 and the second floating module 30 are respectively arranged on the upper side and the lower side of the support frame 10 in a sliding mode and can reciprocally move along the length direction of the support frame 10, so that flexible adjustment and adaptation to different sizes of plates are realized. A floating compensation component 40 is arranged on the first floating module 20 and is used for dynamically adjusting the pressing force, providing a looseness compensation amount of the device due to long-term operation, avoiding periodic slight bouncing of the plate caused by dynamic attenuation of the pressing force, and thus avoiding distortion of the edge trimming track. Specifically, the floating compensation component 40 comprises a support column 41, a fixed support plate 42 and a shell frame 43. The fixed support plate 42 is fixedly connected with the first floating module 20 and provides a stable support basis. The shell frame 43 is arranged on the fixed support plate 42 and forms a placement cavity 50 together with the fixed support plate 42, so as to provide a protective movement space for internal components. An active part 44 is arranged in the placement cavity 50 and can reciprocally move along the length direction of the placement cavity 50. A first elastic part 45 is arranged between the active part 44 and the shell frame 43 and cooperates with the active part 44 to compensate for slight bouncing of the plate in real time and provide restoring force and buffering effect for the active part 44, so as to ensure the continuous stability of the pressing force. One end of the support column 41 penetrates through the shell frame 43 and is fixedly connected with the active part 44, and the other end is hoisted on the edge banding machine, so that floating connection of the whole structure is realized, vibration is effectively absorbed, and slight bouncing of the plate in the plate conveying and finishing process is reduced.

[0036] In the embodiment, one end of the support column 41 away from the fixed support plate 42 is also provided with an adjusting part 46, the adjusting part 46 is adjustably arranged on the shell frame 43 and is located between the shell frame 43 and the first elastic part 45, and is used for accurately adjusting the pre-tightening force of the first elastic part 45 to meet different machining requirements. One end of the first elastic part 45 abuts against the active part 44, and the other end abuts against the adjusting part 46, so as to ensure effective transmission of the elastic force. The other end of the support column 41 close to the second floating module 30 penetrates through the shell frame 43 and the adjusting part 46 in sequence and is fixedly connected with the active part 44, so that stable connection and floating compensation functions of the structure are realized.

[0037] The shell frame 43 is fixedly connected with the fixed support plate 42 through fastening rod parts 47, so as to ensure the stability and reliability of the structure. First and second avoiding through holes 461 and 441 corresponding to the fastening rod parts 47 are respectively arranged on the adjusting part 46 and the active part 44, so as to facilitate installation and adjustment of the fastening rod parts 47 and avoid interference between components.

[0038] The first elastic part 45 is sleeved and arranged on the fastening rod parts 47, so as to play an elastic supporting role and ensure compactness of the structure.

[0039] The adjusting part 46 is provided with an adjusting sleeve 462 on the side away from the movable part 44, and the shell frame 43 is provided with an assembly through hole 431 matched with the adjusting sleeve 462, so as to facilitate the installation and adjustment of the adjusting part 46. The shell frame 43 is also provided with a locking through hole 432, which is in communication with the assembly through hole 431 and is vertically arranged. A locking part is installed on the locking through hole 432, which is used to lock the position of the adjusting part 46 and prevent it from loosening during use.

[0040] The shell frame 43 is also provided with a waist-shaped through groove 433 on the symmetrical two sides, which is in communication with the accommodation cavity 50, so as to facilitate the observation and adjustment of the position of the movable part 44. The side wall of the waist-shaped through groove 433 is provided with a scale line, which provides accurate adjustment reference and ensures the accuracy and repeatability of the adjustment process.

[0041] Further, the support frame 10 includes a vertical plate 11 and a horizontal plate 12, which is arranged at the symmetrical two ends of the vertical plate 11 and is fixedly connected with the vertical plate 11, so as to enhance the stability of the overall structure. A guide column 13 is fixedly arranged between the two horizontal plates 12, which is arranged in parallel with the vertical plate 11. The first floating module 20 and the second floating module 30 are respectively slidably installed on the guide column 13 through a first sliding seat 21 and a second sliding seat 31. The first sliding seat 21 is located above the second sliding seat 31, so as to ensure the hierarchical nature and functional division of the structure. The first sliding seat 21 and the second sliding seat 31 can reciprocally move along the axial length direction of the guide column 13, so as to meet the dynamic adjustment requirement in the plate finishing process. The support column 41 is fixedly connected with the edge banding machine through a connecting member 60 at the end away from the shell frame 43, so as to ensure the stable connection between the floating compensation member 40 and the edge banding machine.

[0042] The vertical plate 11 is respectively provided with a first telescopic damping part 14 and a second telescopic damping part 15 on the symmetrical two sides, which are used to provide appropriate damping force, slow down the moving speed of each sliding seat and ensure the stability of the movement. One end of the first telescopic damping part 14 is connected with the vertical plate 11, and the other end is connected with the first sliding seat 21. One end of the second telescopic damping part 15 is connected with the vertical plate 11, and the other end is connected with the second sliding seat 31. The first sliding seat 21 and the second sliding seat 31 are respectively provided with a first installation groove 211 and a second installation groove 311 on the side away from the guide column 13, so as to facilitate the installation and positioning of the first floating module 20 and the second floating module 30.

[0043] 211 and the second installation groove 311, so as to facilitate the installation and positioning of the first floating module 20 and the second floating module 30. The first floating module 20 and the second floating module 30 are respectively provided with a first connecting seat 22 and a second connecting seat 32 on the side close to the guide column 13. The first connecting seat 22 is embeddedly arranged on the first installation groove 211 and can reciprocally move along the transverse length direction of the first installation groove 211, so as to realize the floating adjustment of the first floating module 20 along the transverse direction of the plate.

[0044] 20Fine adjustment in the horizontal direction. The second connecting seat 32 is fitted on the second mounting groove 311 and can reciprocate along the transverse length direction of the second mounting groove 311, realizing fine adjustment of the second floating module 30 in the horizontal direction.

[0045] The vertical plate 11 is provided with a first limiting sliding groove 111 and a second limiting sliding groove 112 corresponding to the first sliding seat 21 and the second sliding seat 31 respectively on the symmetric two sides, which are respectively used for limiting the movement range of the first sliding seat 21 and the second sliding seat 31. The first limiting sliding groove 111 and the second limiting sliding groove 112 are arranged in parallel and staggered, ensuring the independent movement of the two sliding seats on their respective tracks. The side of the first limiting sliding groove 111 away from the first sliding seat 21 is provided with a first fixed plate 70, and a plurality of first push rods 71 arranged in parallel are integrated and installed on the first fixed plate 70. The first push rods 71 pass through the first limiting sliding groove 111 and the first sliding seat 21 in turn and are fixedly connected with the first connecting seat 22. Through the extension and retraction movement of the first push rods 71, the first floating module 20 is driven to be accurately adjusted. The side of the second limiting sliding groove 112 away from the second sliding seat 31 is provided with a second fixed plate 80, and a plurality of second push rods 81 arranged in parallel are integrated and installed on the second fixed plate 80. The second push rods 81 pass through the second limiting sliding groove 112 and the second sliding seat 31 in turn and are fixedly connected with the second connecting seat 32. Through the extension and retraction movement of the second push rods 81, the second floating module 30 is driven to be accurately adjusted.

[0046] Further, the first fixed plate 70 and the second fixed plate 80 are both provided with a telescopic cylinder 90, the transmission end of which is connected with the vertical plate 11. The telescopic cylinder 90 is used for driving the first connecting seat 22 and the second connecting seat 32 to reciprocate transversely, so as to adjust the positions of the first floating module 20 and the second floating module 30 to meet different processing requirements.

[0047] The first mounting groove 211 and the second mounting groove 311 are respectively provided with a second elastic member 212 and a third elastic member 312, which are used for providing additional buffer and compensation force.

[0048] The second elastic member 212 is located between the first sliding seat 21 and the first connecting seat 22, one end of the second elastic member 212 is connected with the first sliding seat 21, and the other end is connected with the first connecting seat 22, which ensures the stability and precision of the first floating module 20 during movement. The third elastic member 312 is located between the second sliding seat 31 and the second connecting seat 32, one end of the third elastic member 312 is connected with the second sliding seat 31, and the other end is connected with the second connecting seat 32, which provides stable support and buffer effect for the second floating module 30, effectively reducing the influence of vibration and impact on processing precision.

[0049] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A floating finishing device for an edge banding machine, characterized in that: The application relates to an edge sealing machine, which comprises a support frame (10), a first floating module (20) and a second floating module (30), the support frame (10) is fixed on the edge sealing machine, the first floating module (20) and the second floating module (30) are respectively arranged on the upper and lower sides of the support frame (10) and can reciprocate along the longitudinal length direction of the support frame (10), a floating compensation component (40) is arranged on the first floating module (20), the floating compensation component (40) comprises a support column (41), a fixed support plate (42) and a shell frame (43), the fixed support plate (42) is fixedly connected with the first floating module (20), the shell frame (43) is arranged on the fixed support plate (42) and forms a placing cavity (50) together with the fixed support plate (42), a movable element (44) is arranged in the placing cavity (50) and can reciprocate along the longitudinal length direction of the placing cavity (50), a first elastic element (45) is arranged between the movable element (44) and the shell frame (43), one end of the support column (41) penetrates through the shell frame (43) and is fixedly connected with the movable element (44), and the other end is hung on the edge sealing machine.

2. The floating finishing device for edge banding machine according to claim 1, characterized in that: One end of the first elastic element (45) is in abutment with the movable element (44), and the other end is in abutment with the adjusting element (46), one end of the support column (41) penetrates through the shell frame (43) and the adjusting element (46) in sequence and is fixedly connected with the movable element (44).

3. The floating finishing device for edge banding machine according to claim 2, characterized in that: The shell frame (43) is fixedly connected with the fixed support plate (42) through fastening rod elements (47), first avoiding through holes (461) and second avoiding through holes (441) corresponding to the fastening rod elements (47) are respectively arranged on the adjusting element (46) and the movable element (44), a plurality of the fastening rod elements (47) are distributed along the outer circumferential side of the support column (41), and the first elastic element (45) is sleeved on the fastening rod elements (47).

4. The floating finishing device for edge banding machine according to claim 2, characterized in that: One side of the adjusting element (46) away from the movable element (44) is provided with an adjusting sleeve (462), a fitting through hole (431) matched with the adjusting sleeve (462) is arranged on the shell frame (43), a locking through hole (432) is further arranged on the shell frame (43) and is in communication with the fitting through hole (431) and is arranged vertically, and a locking element is arranged on the locking through hole (432). Waist-shaped through grooves (433) are further arranged on the symmetrically opposite sides of the shell frame (43), and scale lines are arranged on the side walls of the waist-shaped through grooves (433).

5. The floating finishing device for edge banding machine according to claim 4, characterized in that: ​ 6. The floating finishing device for edge banding machine according to claim 1, characterized in that: The support frame (10) comprises a vertical plate (11) and a horizontal plate (12), the horizontal plate (12) is arranged at two symmetrical ends of the vertical plate (11) and is fixedly connected with the vertical plate (11), a guide column (13) is fixedly arranged between the two horizontal plates (12), the guide column (13) is arranged in parallel with the vertical plate (11), the first floating module (20) and the second floating module (30) are slidably installed on the guide column (13) through a first sliding seat (21) and a second sliding seat (31) respectively, the first sliding seat (21) is located above the second sliding seat (31), the first sliding seat (21) and the second sliding seat (31) can reciprocate along the axial length direction of the guide column (13), and one end of the support column (41) away from the shell frame (43) is fixedly connected with the edge sealing machine through a connecting member (60).

7. The floating finishing device for edge banding machines according to claim 6, characterized in that: The vertical plate (11) is provided with a first telescopic damping member (14) and a second telescopic damping member (15) on two symmetrical sides respectively, one end of the first telescopic damping member (14) is connected with the vertical plate (11), the other end is connected with the first sliding seat (21), one end of the second telescopic damping member (15) is connected with the vertical plate (11), the other end is connected with the second sliding seat (31), the first sliding seat (21) and the second sliding seat (31) are provided with a first mounting groove (211) and a second mounting groove (311) on the side away from the guide column (13) respectively, the first floating module (20) and the second floating module (30) are provided with a first connecting seat (22) and a second connecting seat (32) on the side close to the guide column (13) respectively, the first connecting seat (22) is embeddedly arranged on the first mounting groove (211) and can reciprocate along the transverse length direction of the first mounting groove (211), and the second connecting seat (32) is embeddedly arranged on the second mounting groove (311) and can reciprocate along the transverse length direction of the second mounting groove (311).

8. The floating finishing device for edge banding machine according to claim 7, characterized in that: The vertical plate (11) is symmetrically provided with a first limiting sliding groove (111) and a second limiting sliding groove (112) corresponding to the first sliding seat (21) and the second sliding seat (31) respectively, the first limiting sliding groove (111) and the second limiting sliding groove (112) are arranged in parallel, the first limiting sliding groove (111) is provided with a first fixed plate (70) away from the first sliding seat (21), a plurality of first push rods (71) are integrally installed on the first fixed plate (70), the first push rods (71) pass through the first limiting sliding groove (111) and the first sliding seat (21) in sequence and are fixedly connected with the first connecting seat (22), the second limiting sliding groove (112) is provided with a second fixed plate (80) away from the second sliding seat (31), a plurality of second push rods (81) are integrally installed on the second fixed plate (80), the second push rods (81) pass through the second limiting sliding groove (112) and the second sliding seat (31) in sequence and are fixedly connected with the second connecting seat (32).

9. The floating finishing device for edge banding machines according to claim 8, characterized in that: The first fixed plate (70) and the second fixed plate (80) are provided with telescopic cylinders (90), the transmission end of the telescopic cylinder (90) is connected with the vertical plate (11), and the telescopic cylinder (90) is used for driving the first connecting seat (22) and the second connecting seat (32) to move transversely and reciprocally.

10. The floating finishing device for edge banding machine according to claim 7, characterized in that: The first mounting groove (211) and the second mounting groove (311) are respectively provided with a second elastic member (212) and a third elastic member (312), the second elastic member (212) is located between the first sliding seat (21) and the first connecting seat (22), one end of the second elastic member (212) is connected with the first sliding seat (21), and the other end is connected with the first connecting seat (22), the third elastic member (312) is located between the second sliding seat (31) and the second connecting seat (32), one end of the third elastic member (312) is connected with the second sliding seat (31), and the other end is connected with the second connecting seat (32).

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