A deformation-resistant SPC lock floor structure

Abstract

The application discloses an anti-deformation SPC lock floor structure, aiming to provide an anti-deformation SPC lock floor structure with firm dovetail splicing. It comprises a floor one and a floor two, the floor one is fixed with a male dovetail, the floor two is provided with a female dovetail matched with the male dovetail, the floor one is connected with the floor two through cooperation of the male dovetail and the female dovetail, the inner side wall of the female dovetail is provided with a pressing block sliding groove one, the pressing block sliding groove one is internally and slidably connected with a pressing block one, the floor two is internally provided with a pressing block one pushing device and a locking device, and the pressing block one pushing device and the locking device are connected with the pressing block one. The anti-deformation SPC lock floor structure has the advantages of improving the firmness of the dovetail splicing, compact structure, good continuity, simple structure, convenient installation and fixation and good stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of floor, in particular to an anti-deformation SPC lock buckle floor structure. BACKGROUND

[0002] The SPC lock buckle floor is composed of a thick wear-resistant layer, a UV layer, a color film texture layer and a base material layer. In European and American countries, this floor is called RVP (rigid vinyl plank) or rigid plastic floor. The base material is a composite board made of stone powder and thermoplastic polymer material after stirring and high-temperature extrusion, which has the performance and characteristics of both wood and plastic, ensuring the strength and toughness of the floor.

[0003] The lock buckle technology is to connect the floor by the way of mutual engagement of the tenon around the floor, so as to assemble the floor blocks into a whole structure. The lock buckle technology realizes "self-connection" without any external auxiliary components, which is a more advanced floor structure in the industry. Especially after the rise of geothermal, through repeated tests, the industry gradually realizes that the lock buckle floor can be directly laid on the floor heating to ensure the heat conduction effect of the floor heating, and the lock buckle can ensure the stability of the floor.

[0004] The tenon splicing on the existing lock buckle floor is not firm, and after a long time of use, the splicing of the tenon is prone to deformation, resulting in obvious gaps, which causes a creaking sound when people step on the floor, affecting the normal use of the floor. SUMMARY

[0005] The present application is to overcome the deficiency of the existing technology that the tenon splicing is not firm enough, and provides an anti-deformation SPC lock buckle floor structure with firm tenon splicing.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] An anti-deformation SPC lock buckle floor structure, comprising a floor one and a floor two, wherein the floor one is provided with a male tenon, the floor two is provided with a female tenon matched with the male tenon, the floor one is connected with the floor two through the cooperation of the male tenon and the female tenon, the inner side wall of the female tenon is provided with a compression block sliding groove one, the compression block sliding groove one is slidably connected with a compression block one, the floor two is internally provided with a compression block one pushing device and a locking device, and the compression block one pushing device and the locking device are connected with the compression block one.

[0008] The male tenon on the floor one is inserted into the female tenon on the floor two for splicing and installation. After splicing, the compression block one pushing device is used to control the compression block one to move towards the male tenon and firmly press the male tenon on the inner side wall of the female tenon for fixation. Finally, the locking device is used to lock the compression block one, so as to improve the firmness of the tenon splicing.

[0009] As a preferred, the pushing device of the pressing block one comprises a rotating rod, one end of the rotating rod is installed on the bottom surface of the pressing block sliding groove one and is rotationally connected with the pressing block sliding groove one, the outer side surface of the other end of the rotating rod is provided with external threads, the pressing block one is provided with an internal threaded hole matched with the external threads, the rotating rod is threadedly connected with the pressing block one through the cooperation of the external threads and the internal threaded hole, the side wall of the pressing block sliding groove one is provided with a limiting sliding groove, the pressing block one is fixed with a limiting sliding block matched with the limiting sliding groove, and the pressing block one is slidingly connected with the pressing block sliding groove one through the cooperation of the limiting sliding block and the limiting sliding groove. When the rotating rod rotates, the pressing block one moves axially relative to the rotating rod under the action of the threads, and the male tenon is close to the female tenon. Through the design of the limiting sliding block and the limiting sliding groove, the sliding of the pressing block one in the pressing block sliding groove one is guided and limited.

[0010] As a preferred, the inside of the floor two is provided with a floor cavity one, the floor cavity one is arranged on the side surface of the female tenon and is provided with a connecting opening one between the floor cavity one and the female tenon, a gear is installed in the floor cavity one, the edge of the gear is arranged in the female tenon through the connecting opening one, the surface of the male tenon is provided with a rack matched with the gear, the bottom surface of the pressing block sliding groove one is provided with a rotating rod mounting groove matched with the rotating rod, one end of the rotating rod is arranged in the rotating rod mounting groove and is rotationally connected with the rotating rod mounting groove, the inner side wall of the rotating rod mounting groove is provided with an annular chamber, the annular chamber is arranged on the side surface of the floor cavity one and is provided with a connecting opening two between the annular chamber and the floor cavity one, the rotating rod is provided with a spiral part matched with the gear, and the edge of the gear is arranged in the annular chamber through the connecting opening two and is engaged with the spiral part on the rotating rod. In the process that the male tenon is inserted into the female tenon, the rack on the male tenon is engaged with the gear, the gear is driven to rotate, and through the worm and gear structure formed by the spiral part on the rotating rod and the gear, the purpose that the gear drives the rotating rod to rotate is achieved. The structure is compact and has good continuity.

[0011] As a preferred, the rotating rod is fixed with a limiting baffle, and the limiting baffle is arranged on the bottom surface of the annular chamber and the top surface of the annular chamber respectively. Through the design of the limiting baffle, the rotating rod is limited.

[0012] As a preferred, the gear is fixed with a rotating mounting column, the side walls of the opposite two sides of the floor cavity one are respectively provided with rotating mounting grooves matched with the two ends of the rotating mounting column, and the gear is installed in the floor cavity one and is rotationally connected with the floor cavity one through the cooperation of the rotating mounting column and the rotating mounting grooves. The structure is simple, convenient to install and fix, and has good stability.

[0013] As preferred, the end face of the rotating mounting column is provided with a mounting column through hole, the locking device comprises an inner ratchet gear arranged on the inner side wall of the mounting column through hole, the inner part of the mounting column through hole is provided with a fixing block, the fixing block is fixed on the side wall of the floor cavity one, a pawl is arranged on the fixing block, and the inner ratchet gear and the pawl are engaged. The pawl is used for clamping the inner ratchet gear on the gear, so that the gear can only rotate in one direction and cannot be reversed, and then the gear is clamped on the rack, so that the locking of the tenon is achieved, so as to prevent the tenon from retreating; meanwhile, the rotating rod is also locked to prevent the compression block from being loosened, so as to ensure the firmness of the tenon splicing.

[0014] As preferred, the inner part of the fixing block is provided with a fixing block cavity, a rotating column is arranged in the fixing block cavity, the rotating column and the fixing block cavity are rotationally connected, a torsion spring is arranged at the connecting position of the rotating column and the fixing block cavity, a side opening is arranged on the side wall of the fixing block cavity, one side of the pawl is fixed on the rotating column, the other side of the pawl is engaged with the inner ratchet gear through the side opening, a limiting flange is fixed on the side opening, and the pawl is in contact with the limiting flange. The pawl is pressed on the inner ratchet gear and engaged with the inner ratchet gear under the elastic force of the torsion spring. When the gear is driven by the rack to rotate forward, the pawl does not clamp the inner ratchet gear at this time, and the gear can rotate smoothly; when the gear wants to rotate reversely, the pawl clamps the inner ratchet gear at this time, and the entire gear is locked, so that it cannot be reversed.

[0015] As preferred, the inner side wall of the female tenon is provided with a compression block sliding groove two, the compression block sliding groove one and the compression block sliding groove two are arranged on two adjacent inner side walls of the female tenon respectively, a compression block two is slidably connected in the compression block sliding groove two, and a compression block two driving device is arranged in the floor two and connected with the compression block two. After the male tenon and the female tenon are spliced, the compression block two driving device is used for controlling the compression block two to move towards the male tenon, and the male tenon is fixed on the other inner side wall of the female tenon, so that the firmness of the tenon splicing is further improved.

[0016] As preferred, the second floor has a floor cavity two, the floor cavity two and the female tenon are communicated through a pressing block slot two, the pressing block two is fixed with a guide block one, the guide block one is arranged in the floor cavity two, the guide block two is slidably connected in the floor cavity two, the guide block one and the guide block two are respectively provided with a matching inclined surface one and an inclined surface two, the bottom surface of the female tenon is provided with a bottom slot, the bottom slot is arranged on the side of the floor cavity two and is slidably connected with a movable block in the inside, the side wall of the bottom slot and the side wall of the floor cavity two are communicated through a connecting slot, the connecting slot is slidably connected with a connecting block, and one end of the connecting block is fixed on the movable block and the guide block two respectively. In the natural state, part of the movable block is exposed from the bottom slot. When the male tenon is inserted into the female tenon, the movable block is pushed to move relatively in the bottom slot, and under the transmission of the connecting block, the guide block two is also synchronously moved in the floor cavity two; then under the pressure transmission of the inclined surface one and the inclined surface two, the pressing block two on the guide block one is moved in the pressing block slot two, and moves towards the male tenon, so as to firmly press the male tenon on the other inner side wall of the female tenon to fix the male tenon, and the firmness of the tenon splicing is further improved.

[0017] As preferred, the cross-sectional width of the pressing block two is smaller than the width of the guide block one, a limiting spring is sleeved on the pressing block two, one end of the limiting spring is fixed on the guide block one, and the other end of the limiting spring is fixed on the inner side wall of the floor cavity two. In the natural state, the pressing block two is retracted in the inside of the pressing block slot two through the elastic force of the guide block one of the limiting spring, so as to prevent the male tenon from being clamped by the pressing block two during the insertion of the female tenon.

[0018] The present application has the advantages of improving the firmness of the tenon splicing, compact structure, good continuity, simple structure, convenient installation and fixing, and good stability. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present application;

[0020] Figure 2 is Figure 1 an internal structure diagram of the present application;

[0021] Figure 3 is Figure 2 a structural schematic diagram of the gear part in the present application;

[0022] Figure 4 is Figure 2 an enlarged view of C in the present application;

[0023] Figure 5 is Figure 1 a sectional view of A-A in the present application;

[0024] Figure 6 is Figure 1 is a sectional view at B-B in FIG.

[0025] In the figure: 1. floor one, 2. floor two, 3. male tenon, 4. floor cavity one, 5. gear, 6. rack, 7. female tenon, 8. rotating mounting column, 9. mounting column through hole, 10. inner ratchet, 11. fixing block, 12. rotating column, 13. fixing block cavity, 14. side opening, 15. pawl, 16. limiting flange, 17. rotating rod mounting slot, 18. rotating rod, 19. limiting baffle, 20. annular chamber, 21. spiral portion, 22. limiting sliding slot, 23. limiting sliding block, 24. pressing block sliding slot one, 26. pressing block one, 27. inner threaded hole, 28. outer thread, 29. rotating mounting slot, 30. torsion spring, 31. pressing block two, 32. pressing block sliding slot two, 33. limiting spring, 34. guide block one, 35. guide block two, 36. floor cavity two, 37. connecting block, 38. connecting sliding slot, 39. bottom sliding slot, 40. movable block. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings and specific embodiments.

[0027] As Figure 1 and Figure 2 described in the embodiments, an anti-deformation SPC lock buckle floor structure includes floor one 1 and floor two 2, the male tenon 3 is fixed on the floor one 1, the female tenon 7 matched with the male tenon 3 is arranged on the floor two 2, the floor one 1 is connected with the floor two 2 through the cooperation of the male tenon 3 and the female tenon 7, as shown in Figure 4 the inner side wall of the female tenon 7 is provided with the pressing block sliding slot one 24, the pressing block one 26 is slidably connected inside the pressing block sliding slot one 24, the pressing block one pushing device and the locking device are installed inside the floor two 2, and the pressing block one pushing device and the locking device are connected with the pressing block one 26.

[0028] As Figure 4 shown, the pressing block one pushing device includes the rotating rod 18, one end of the rotating rod 18 is mounted on the bottom surface of the pressing block sliding slot one 24 and is rotationally connected therewith, the outer side surface of the other end of the rotating rod 18 is provided with the outer thread 28, the pressing block one 26 is provided with the inner threaded hole 27 matched with the outer thread 28, the rotating rod 18 is threadedly connected with the pressing block one 26 through the cooperation of the outer thread 28 and the inner threaded hole 27, the side wall of the pressing block sliding slot one 24 is provided with the limiting sliding slot 22, the pressing block one 26 is fixed with the limiting sliding block 23 matched with the limiting sliding slot 22, and the pressing block one 26 is slidably connected with the pressing block sliding slot one 24 through the cooperation of the limiting sliding block 23 and the limiting sliding slot 22.

[0029] As shown in Figure 2 and Figure 4 , the inner part of the floor two 2 is provided with a floor cavity one 4, the floor cavity one 4 is placed on the side of the female tenon 7 and a connecting opening one is arranged between them, the gear 5 is installed in the floor cavity one 4, the edge of the gear 5 is placed in the female tenon 7 through the connecting opening one, the surface of the male tenon 3 is provided with a gear rack 6 engaged with the gear 5, the bottom surface of the pressing block sliding groove one 24 is provided with a rotating rod installation slot 17 matched with the rotating rod 18, one end of the rotating rod 18 is placed in the rotating rod installation slot 17 and is rotatably connected with it, the inner side wall of the rotating rod installation slot 17 is provided with an annular chamber 20, the annular chamber 20 is placed on the side of the floor cavity one 4 and a connecting opening two is arranged between them, the rotating rod 18 is provided with a spiral part 21 matched with the gear 5, the edge of the gear 5 is placed in the annular chamber 20 through the connecting opening two and is engaged with the spiral part 21 on the rotating rod 18.

[0030] As shown in Figure 4 , the rotating rod 18 is fixed with a limiting baffle 19, the limiting baffle 19 is respectively placed on the bottom surface of the annular chamber 20 and the top surface of the annular chamber 20.

[0031] As shown in Figure 5 , the gear 5 is fixed with a rotating installation column 8, the side walls on the opposite sides of the floor cavity one 4 are respectively provided with rotating installation slots 29 matched with the two ends of the rotating installation column 8, the gear 5 is installed in the floor cavity one 4 through the cooperation of the rotating installation column 8 and the rotating installation slot 29 and is rotatably connected with it.

[0032] As shown in Figure 3 , the end surface of the rotating installation column 8 is provided with an installation column through hole 9, the locking device includes an inner ratchet wheel 10 arranged on the inner side wall of the installation column through hole 9, the inner part of the installation column through hole 9 is provided with a fixed block 11, the fixed block 11 is fixed on the side wall of the floor cavity one 4, the fixed block 11 is installed with a pawl 15, the inner ratchet wheel 10 and the pawl 15 are engaged.

[0033] As shown in Figure 3 , the inner part of the fixed block 11 is provided with a fixed block cavity 13, a rotating column 12 is installed in the fixed block cavity, the rotating column 12 and the fixed block cavity 13 are rotatably connected and a torsional spring 30 is installed at the connection part of them, the side wall of the fixed block cavity 13 is provided with a side opening 14, one side of the pawl 15 is fixed on the rotating column 12, the other side of the pawl 15 is engaged with the inner ratchet wheel 10 through the side opening 14, a limiting flange 16 is fixed on the side opening 14, the pawl 15 and the limiting flange 16 are in contact.

[0034] As shown in Figure 6As shown, the inner side wall of the female tenon 7 is provided with the pressing block sliding groove two 32, the pressing block sliding groove one 24 and the pressing block sliding groove two 32 are respectively arranged on two adjacent inner side walls of the female tenon 7, the pressing block two 31 is slidably connected in the pressing block sliding groove two 32, the floor two 2 is internally provided with the pressing block two pushing device, and the pressing block two pushing device is connected with the pressing block two 31.

[0035] As shown in the drawings, Figure 6 The floor two 2 has a floor cavity two 36, the floor cavity two 36 and the female tenon 7 are connected through the pressing block sliding groove two 32, the guiding block one 34 is fixed on the pressing block two 31, the guiding block one 34 is arranged in the floor cavity two 36, the guiding block two 35 is slidably connected in the floor cavity two 36, the guiding block one 34 and the guiding block two 35 are respectively provided with the mutually matched inclined surface one and inclined surface two, the bottom sliding groove 39 is arranged on the bottom surface of the female tenon 7, the bottom sliding groove 39 is arranged on the side of the floor cavity two 36 and slidably connected with the movable block 40 in the inside, the side wall of the bottom sliding groove 39 and the side wall of the floor cavity two 36 are connected through the connecting sliding groove 38, the connecting block 37 is slidably connected in the connecting sliding groove 38, and one end of the connecting block 37 is respectively fixed on the movable block 40 and the guiding block two 35.

[0036] As shown in the drawings, Figure 6 The cross-sectional width of the pressing block two 31 is smaller than the width of the guiding block one 34, the limiting spring 33 is sleeved on the pressing block two 31, one end of the limiting spring 33 is fixed on the guiding block one 34, and the other end of the limiting spring 33 is fixed on the inner side wall of the floor cavity two 36.

[0037] Working principle:

[0038] In the process of inserting the male tenon 3 into the female tenon 7, the rack 6 on the male tenon 3 will engage with the gear 5, driving the gear 5 to rotate, and through the worm and gear structure formed by the helical part 21 on the rotating rod 18 and the gear 5, the rotating rod 18 is driven to rotate. When the rotating rod 18 rotates, under the action of the screw thread, the pressing block one 26 will move axially relative to the rotating rod 18, moving the male tenon 3 closer and firmly pressing the male tenon 3 against the inner side wall of the female tenon 7 for fixation (at this time, the pawl 15 is pressed against the inner ratchet wheel 10 and engaged with it under the elastic force of the torsion spring 30. When the gear 5 is driven to rotate forward by the rack 6, the pawl 15 will not block the inner ratchet wheel 10 at this time, and the gear 5 can rotate smoothly; when the gear 5 wants to reverse, the pawl 15 will block the inner ratchet wheel 10, thereby locking the entire gear 5, so that it cannot be reversed. By clamping the inner ratchet wheel 10 on the gear 5 with the pawl 15, the gear 5 can only rotate in one direction and cannot be reversed, and then the gear 5 clamps the rack 6, thereby achieving the purpose of locking the male tenon 3 to prevent the male tenon 3 from retreating; further, the rotating rod 18 is also locked to prevent the pressing block one 26 that presses the male tenon 3 from loosening. At the same time, when the male tenon 3 is inserted into the female tenon 7, it will also push the movable block 40 to move relatively in the bottom sliding groove 39, and under the transmission action of the connecting block 37, it will drive the guide block two 35 to move synchronously in the floor cavity two 36; then under the pressure transmission action of the inclined surface one and the inclined surface two, it will drive the pressing block two 31 on the guide block one 34 to move in the pressing block sliding groove two 32, moving towards the male tenon 3 and firmly pressing the male tenon 3 against the other inner side wall of the female tenon 7. The positions of the male tenon 3 in the female tenon 7 in the up-down, left-right and front-back directions are fixed.

Claims

1. A deformation-resistant SPC interlocking floor structure, characterized in that, The system includes floor 1 (1) and floor 2 (2). Floor 1 (1) is fixed with a male tenon (3), and floor 2 (2) is provided with a female tenon (7) that matches the male tenon (3). Floor 1 (1) is connected to floor 2 (2) through the cooperation of the male tenon (3) and the female tenon (7). The inner wall of the female tenon (7) is provided with a pressing block groove 1 (24). The pressing block groove 1 (24) is slidably connected to pressing block 1 (26). The floor 2 (2) is equipped with a pressing block 1 pushing device and a locking device. The pressing block 1 pushing device and the locking device are both connected to pressing block 1 (26). The pressing block 1 pushing device includes a rotating rod (18). One end of the rotating rod (18) is installed in the pressing block groove 1 (24). On the bottom surface of 24), and rotatably connected thereto, the outer side surface of the other end of the rotating rod (18) is provided with an external thread (28), the clamping block one (26) is provided with an internal thread hole (27) that matches the external thread (28), the rotating rod (18) is threadedly connected to the clamping block one (26) through the cooperation of the external thread (28) and the internal thread hole (27), the side wall of the clamping block slide groove one (24) is provided with a limiting slide groove (22), the clamping block one (26) is fixed with a limiting slider (23) that matches the limiting slide groove (22), the clamping block one (26) is slidably connected to the clamping block slide groove one (24) through the cooperation of the limiting slider (23) and the limiting slide groove (22), the interior of the floor two (2) is provided with a floor cavity one (4) The floor cavity (4) is placed on the side of the female tenon (7) and a connecting opening is provided between them. A gear (5) is installed in the floor cavity (4). The edge of the gear (5) is placed in the female tenon (7) through the connecting opening. The surface of the male tenon (3) is provided with a rack (6) that meshes with the gear (5). The bottom surface of the pressing block groove (24) is provided with a rotating rod mounting groove (17) that matches the rotating rod (18). One end of the rotating rod (18) is placed in the rotating rod mounting groove (17) and rotatedly connected to it. An annular chamber (20) is provided on the inner wall of the rotating rod mounting groove (17). The annular chamber (20) is placed on the side of the floor cavity (4) and a connecting opening is provided between them. The rotating rod (18) is provided with a helical part (21) that matches the gear (5). The edge of the gear (5) is placed in the annular cavity (20) through the connecting opening and meshes with the helical part (21) on the rotating rod (18). The end face of the rotating mounting post (8) is provided with a mounting post through hole (9). The locking device includes an inner ratchet (10) provided on the inner side wall of the mounting post through hole (9). The mounting post through hole (9) is provided with a fixing block (11). The fixing block (11) is fixed on the side wall of the floor cavity (4). A pawl (15) is installed on the fixing block (11). The inner ratchet (10) and the pawl (15) mesh with each other. The fixing block (11) is provided with a fixing block cavity (13).A rotating column (12) is installed in the cavity (13) of the fixed block. The rotating column (12) and the cavity (13) of the fixed block are rotatably connected, and a torsion spring (30) is installed at the connection between them. A side opening (14) is provided on the side wall of the cavity (13). One side of the pawl (15) is fixed to the rotating column (12), and the other side of the pawl (15) is engaged with the inner ratchet (10) through the side opening (14). A limiting flange (16) is fixed on the side opening (14), and the pawl (15) and the limiting flange (16) are in contact.

2. The deformation-resistant SPC interlocking floor structure according to claim 1, characterized in that, A limiting baffle (19) is fixed on the rotating rod (18), and the limiting baffle (19) is placed on the bottom surface and the top surface of the annular cavity (20).

3. The deformation-resistant SPC interlocking floor structure according to claim 1, characterized in that, The gear (5) is fixed with a rotating mounting column (8). The side walls on opposite sides of the floor cavity (4) are respectively provided with rotating mounting grooves (29) that match the two ends of the rotating mounting column (8). The gear (5) is installed in the floor cavity (4) and rotatedly connected to it through the cooperation of the rotating mounting column (8) and the rotating mounting groove (29).

4. The deformation-resistant SPC interlocking floor structure according to claim 1, characterized in that, The inner wall of the tenon (7) is provided with a second pressing block groove (32). The first pressing block groove (24) and the second pressing block groove (32) are respectively placed on two adjacent inner walls of the tenon (7). The second pressing block (31) is slidably connected in the second pressing block groove (32). The inside of the second floor (2) is equipped with a pressing block pushing device. The pressing block pushing device is connected to the second pressing block (31).

5. The deformation-resistant SPC interlocking floor structure according to claim 4, characterized in that, The interior of the second floor (2) has a second floor cavity (36). The second floor cavity (36) and the tenon (7) are connected by a second clamping block groove (32). A guide block (34) is fixed on the second clamping block (31). The guide block (34) is placed inside the second floor cavity (36). A guide block (35) is slidably connected inside the second floor cavity (36). The guide block (34) and the guide block (35) are respectively provided with a matching inclined surface (1) and an inclined surface (2). The bottom surface of the tenon (7) is provided with a bottom groove (39). The bottom groove (39) is placed on the side of the floor cavity two (36) and a movable block (40) is slidably connected inside it. The side wall of the bottom groove (39) and the side wall of the floor cavity two (36) are connected by a connecting groove (38). A connecting block (37) is slidably connected inside the connecting groove (38). One end of the connecting block (37) is fixed on the movable block (40) and the guide block two (35) respectively.

6. The deformation-resistant SPC interlocking floor structure according to claim 5, characterized in that, The cross-sectional width of the second pressing block (31) is smaller than the width of the first guide block (34). A limiting spring (33) is fitted on the second pressing block (31). One end of the limiting spring (33) is fixed on the first guide block (34), and the other end of the limiting spring (33) is fixed on the inner wall of the second floor cavity (36).

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