A sliding door with a concealed track

Abstract

This invention discloses a sliding door with a concealed track, comprising a track and a sliding door mounted on the track. The track includes a groove for the sliding door to slide back and forth. Several baffles are provided on the track, which can swing up and down within the groove to cover it. A drive mechanism is provided within the groove to drive the baffles downwards. A return spring is provided between the baffles and the track to allow the baffles to swing upwards and return to their original position. A push plate is provided at the bottom of the sliding door, located within the groove, to push the drive mechanism. By covering the groove with baffles, the groove is concealed, preventing it from being exposed to the outside. This prevents dust and debris from entering the groove, extending its service life, and reducing the hassle of cleaning the groove.

Description

Technical Field

[0001] This utility model relates to the technical field of sliding doors, and more particularly to a sliding door with a concealed track. Background Technology

[0002] Sliding doors are widely used in the building decoration industry due to their space-saving, aesthetic, and practical features, covering various scenarios such as residential, commercial office, and industrial applications. However, traditional sliding door tracks have some shortcomings in daily use. For example, the bottom track is usually exposed, allowing dust and debris to easily enter the track, affecting the smooth sliding of the casters, increasing wear, and shortening the lifespan of the sliding door. Moreover, when the sliding door is closed, the track remains open, which not only affects the appearance but may also pose a safety hazard, such as a person accidentally kicking or stepping on the opening in the track, which could easily lead to a fall and injury. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a sliding door that can hide the guide rail to prevent dust or debris from entering the slide groove and thus ensure its cleanliness.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0005] A sliding door with a concealed track includes a track and a sliding door mounted on the track. The track includes a groove for the sliding door to slide back and forth. The track is provided with several baffles that can swing up and down within the groove to cover and conceal it. A drive mechanism is provided within the groove to drive the baffles to swing downward. A return spring is provided between the baffles and the track to allow the baffles to swing upward and return to their original position. A push plate is provided at the bottom of the sliding door and within the groove to push the drive mechanism to move.

[0006] In a preferred embodiment of this utility model, both the left and right sides of the slide groove are C-shaped, so that a receiving cavity for accommodating the drive mechanism is formed in the slide groove; the sliding door includes a door body and a slide base disposed at the bottom of the door body and slidable in the slide groove, the slide base is I-shaped, and the push plate is disposed on the left or right side of the slide base.

[0007] In a preferred embodiment of this utility model, a plurality of first joints are spaced apart on the upper sidewall of the slide groove, and a first connector is provided on the baffle between two adjacent first joints. The first connector is provided with a first hinge hole, and a second hinge hole is provided on both sides of the first joint that can communicate with the first hinge hole. A first hinge shaft is provided on the track that can pass through the second hinge hole, the first hinge hole and the second hinge hole in sequence to hinge the baffle to the track. There is a gap between the first joints and the first connector. A return spring is sleeved on the first hinge shaft, and one end of the return spring abuts against the bottom surface of the baffle and the other end abuts against the upper sidewall of the slide groove.

[0008] In a preferred embodiment of this utility model, the driving mechanism is a driving mechanism that can drive the baffle to swing downward by moving left and right.

[0009] In a preferred embodiment of this utility model, the bottom of the baffle is provided with a second connector, and the driving mechanism includes a first fixed seat disposed on the side wall of the slide, a first moving block disposed on the first fixed seat and movable left and right, a swing arm rotatably connected to the first moving block and hinged to the second connector, and a stop block disposed at the bottom of the first moving block; the push plate includes a first push head disposed on the front side and capable of pushing the stop block to move away from the slide, and a second push head disposed on the rear side and capable of pushing the stop block to move away from the slide.

[0010] In a preferred embodiment of this utility model, the bottom of the baffle is provided with a third connector, and the driving mechanism includes a second fixed seat disposed on the side wall of the slide, a second moving block disposed on the second fixed seat and movable left and right, and a push block disposed on the top of the second moving block and whose other end is drivenly connected to the third connector; the push plate includes a third push head disposed on the front side and capable of pushing the second moving block to move away from the slide, and a fourth push head disposed on the rear side and capable of pushing the second moving block to move away from the slide.

[0011] In a preferred embodiment of this utility model, the driving mechanism is a driving mechanism that can drive the baffle to swing downward by swinging left and right.

[0012] In a preferred embodiment of this utility model, the bottom of the baffle is provided with a fourth connector, and the driving mechanism includes a third fixed seat disposed on the side wall of the slide, a first swing block hinged to the third fixed seat and capable of swinging left and right, and a connecting rod hinged between the first swing block and the fourth connector; the push plate includes a fifth push head disposed on the front side and capable of pushing the first swing block to swing away from the slide, and a sixth push head disposed on the rear side and capable of pushing the first swing block to swing away from the slide.

[0013] In a preferred embodiment of the present invention, the driving mechanism includes a second swing block disposed at the bottom of the baffle; the push plate includes a seventh push head disposed on the front side and capable of pushing the second swing block to swing away from the slide, and an eighth push head disposed on the rear side and capable of pushing the second swing block to swing away from the slide.

[0014] In a preferred embodiment of this utility model, the driving mechanism is a driving mechanism that can drive the baffle to swing downward by swinging up and down; the bottom of the baffle is provided with a fifth connector; the driving mechanism includes a fourth fixed seat disposed on the bottom wall of the slide, a third swing block hinged to the fourth fixed seat and capable of swinging up and down, a pulley seat disposed on the side wall of the slide, and a hinge disposed between the fifth connector and the third swing block and passing through the pulley seat; the push plate includes a ninth push head disposed on the front side and capable of pushing the third swing block to swing downward, and a tenth push head disposed on the rear side and capable of pushing the third swing block to swing downward.

[0015] The beneficial effects of this utility model are as follows: The sliding door includes a track and a sliding door. The track is equipped with several baffles that can swing up and down within a groove to cover and conceal it. A drive mechanism is provided within the groove to drive the baffles downwards. A return spring is provided between the baffles and the track to allow the baffles to swing upwards and return to their original position. A push plate is located at the bottom of the sliding door, within the groove, to push the drive mechanism. By covering and concealing the groove on the track with baffles, the groove is hidden, preventing it from being exposed to the outside. This prevents dust and debris from entering the groove, extending its service life, and also reduces the hassle of cleaning the groove. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 This utility model Figure 1 Enlarged schematic diagram, Figure A;

[0018] Figure 3This is a schematic diagram of the track, baffle, and return spring in this utility model;

[0019] Figure 4 This is an exploded view of the drive mechanism, push plate, reset spring and baffle in the first embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the drive mechanism and baffle in the first embodiment of this utility model;

[0021] Figure 6 This is a schematic diagram of the push plate and slide in the first embodiment of this utility model;

[0022] Figure 7 This is a schematic diagram of the drive mechanism, baffle and push plate in the second embodiment of this utility model;

[0023] Figure 8 This is an exploded view of the drive mechanism, baffle, and push plate in the second embodiment of this utility model;

[0024] Figure 9 This is a schematic diagram of the push plate and slide block in the second embodiment of this utility model;

[0025] Figure 10 This is a schematic diagram of the drive mechanism, baffle and push plate in the third embodiment of this utility model;

[0026] Figure 11 This is an exploded view of the drive mechanism, baffle and push plate in the third embodiment of this utility model;

[0027] Figure 12 This is a schematic diagram of the push plate in the third embodiment of this utility model;

[0028] Figure 13 This is a schematic diagram of the drive mechanism, baffle and push plate in the fourth embodiment of this utility model;

[0029] Figure 14 This is an exploded view of the drive mechanism, baffle and push plate in the fourth embodiment of this utility model;

[0030] Figure 15 This is a schematic diagram of the push plate in the fourth embodiment of this utility model;

[0031] Figure 16 This is a schematic diagram of the drive mechanism, baffle and push plate in the fifth embodiment of this utility model;

[0032] Figure 17 This is a schematic diagram of the push plate in the fifth embodiment of this utility model. Detailed Implementation

[0033] The technical solutions in the embodiments of this utility model will now be clearly and completely described in conjunction with the accompanying drawings.

[0034] Reference Figures 1 to 17 A concealed track sliding door includes a track 1 and a sliding door 2 mounted on the track 1. The track 1 includes a groove 11 for the sliding door 2 to slide back and forth. Several baffles 3 are provided on the track 1, which can swing up and down within the groove 11 to cover it. A drive mechanism 4 is provided within the groove 11 to drive the baffles 3 downwards. A return spring 5 is provided between the baffles 3 and the track 1 to allow the baffles 3 to swing upwards and return to their original position. A push plate 6 is provided at the bottom of the sliding door 2, located within the groove 11, to push the drive mechanism 4. By covering the groove 11 on the track 1 with the baffles 3, the groove 11 is concealed, preventing it from being exposed to the outside. This prevents dust and debris from entering the groove 11, extending its service life, and reducing the hassle of cleaning the groove 11.

[0035] Reference Figures 2 to 3 In this design, both sides of the slide 11 are C-shaped, forming a receiving cavity within the slide 11 to accommodate the drive mechanism 4. The baffle 3 includes limiting steps on its left and right sides that abut against the upper wall of the slide 11, thereby limiting the upward position of the baffle 3 and allowing it to fit against the upper wall of the slide 11. The sliding door 2 includes a door body 21 and a slide base 22 located at the bottom of the door body 21 and capable of sliding within the slide 11. The slide base 22 is I-shaped, and the push plate 6 is located on the left or right side of the slide base 22. Furthermore, rollers are provided between the bottom of the slide base 22 and the bottom surface of the slide 11.

[0036] Reference Figures 3 to 4In this design, the upper sidewall of the slide 11 is provided with a plurality of first coupling joints 12 spaced apart. The baffle 3 is provided with a first connector 31 located between two adjacent first coupling joints 12. The first connector 31 is provided with a first hinge hole 311. Both sides of the first coupling joint 12 are provided with second hinge holes 121 that can communicate with the first hinge holes 311. The track 1 is provided with a first hinge shaft 7 that can pass through the second hinge hole 121, the first hinge hole 311 and the second hinge hole 121 in sequence to hinge the baffle 3 to the track 1. This allows the baffle to swing up and down around the center of the first connector 31, so that when the baffle 3 swings up, it can cover and shield the slide 11, and when it swings down, it can be stored in the slide 11 to avoid obstructing the passage of the slide seat 22, which is conducive to the sliding door 2 sliding back and forth in the slide 11. There is a gap between the first coupling 12 and the first connector 31. The return spring 5 is sleeved on the first hinge shaft 7. One end of the return spring 5 abuts against the bottom surface of the baffle 3 and the other end abuts against the upper side wall of the slide groove 11. In this way, the baffle 3 is swung upward and reset by the return spring 5, so that the upper limit step of the baffle 3 abuts against the bottom surface of the upper wall of the slide groove 11, thereby covering and blocking the slide groove 11.

[0037] In this solution, the drive mechanism 4 is a drive mechanism 4 that can drive the baffle 3 to swing downward by moving left and right.

[0038] The first embodiment of this solution refers to... Figures 4 to 6 The bottom of the baffle 3 is provided with a second connecting head 32, wherein the baffle 3 is shaped like a "7". The driving mechanism 4 includes a first fixed seat 401 disposed on the side wall of the slide 11, a first moving block 402 disposed on the first fixed seat 401 and movable left and right, a swing arm 403 hinged to the first moving block 402 and hinged to the second connecting head 32, and a stop block 404 disposed at the bottom of the first moving block 402. The push plate 6 includes a first push head 601 disposed on the front side and capable of pushing the stop block 404 away from the slide 22, and a second push head 602 disposed on the rear side and capable of pushing the stop block 404 away from the slide 22. Specifically, the stop block 404 includes a first pushing inclined surface disposed on its rear side and capable of abutting against the first push head 601, and a second pushing inclined surface disposed on its front side and capable of abutting against the second push head 602. Furthermore, a top plate is provided on the push plate 6 on the side away from the slide block 22. The first push head 601 and the second push head 602 are both provided on the top plate, and their heads are both inclined surfaces. Of course, the first push head 601 and the second push head 602 can push the top block 404 not only by directly contacting and abutting as described above, but also by non-contact methods, such as having mutually repelling magnets on them.

[0039] The sliding door operates as follows: When the sliding door 2 is pushed forward to open it, the front of the push plate 6 pushes the drive assembly to move, thereby driving the baffle 3 to swing down and retract into the slide groove 11, thus avoiding obstructing the opening of the sliding door 2. After the sliding door 2 passes the baffle 3, the baffle 3 swings up and returns to its original position under the action of the return spring 5, thus completing the covering and blocking. Similarly, when the sliding door 2 is pushed backward, the rear of the push plate 6 pushes the drive assembly to move, causing the baffle 3 to swing down and retract into the slide groove 11, and after the sliding door 2 passes the baffle 3, the baffle 3 swings up and returns to its original position under the action of the return spring 5. Furthermore, during the process of sliding the door 2 forward or backward, when the first pusher 601 or the second pusher 602 is about to contact the abutment block 404, because the mating surface between the two is an inclined surface, the pusher plate 6 can slowly push the abutment block 404 to the side away from the slide block 22, thereby causing the baffle 3 to slowly swing down. After the baffle 3 swings down and is stored in the slide groove 11, the side wall of the pusher plate 6 will abut against the abutment block 404 to prevent the baffle 3 from resetting under the action of the return spring 5. Then, when the second pusher 602 or the first pusher 601 is about to move away from the abutment block 404, the baffle 3 can slowly swing up to reset under the action of the return spring 5 to cover and block the slide groove 11. The working principle of the sliding door 2 is the same as above.

[0040] The second embodiment of this solution refers to... Figures 7 to 9The bottom of the baffle 3 is provided with a third connector 33, wherein the baffle 3 is shaped like a "7". The driving mechanism 4 includes a second fixed seat 411 disposed on the side wall of the slide 11, a second moving block 412 disposed on the second fixed seat 411 and movable left and right, and a push block 413 disposed on the top of the second moving block 412 and whose other end is drivenly connected to the third connector 33. The push plate 6 includes a third push head 603 disposed on the front side and capable of pushing the second moving block 412 away from the slide 22, and a fourth push head 604 disposed on the rear side and capable of pushing the second moving block 412 away from the slide 22. Specifically, the second moving block 412 includes a third pushing slope located on its rear side and abutting against the third pusher head 603, and a fourth pushing slope located on its front side and abutting against the fourth pusher head 604; a stop plate is provided on the push plate 6 on the side away from the slide block 22, and both the third pusher head 603 and the fourth pusher head 604 are provided on the stop plate, with their heads being inclined surfaces. The end of the push block 413 connected to the third connector 33 has a strip groove to hinge the two together, so that the movement of the push block 413 can drive the baffle 3 to swing downwards. The working principle of the sliding door is the same as above. Of course, the third pusher head 603 and the fourth pusher head 604 can push the second moving block 412 not only through the above-mentioned direct contact but also through a non-contact method, such as by having mutually repelling magnets on them.

[0041] In this scheme, the driving mechanism 4 is a driving mechanism 4 that can drive the baffle 3 to swing downward by swinging left and right.

[0042] The third embodiment of this solution refers to... Figures 10 to 12The bottom of the baffle 3 is provided with a fourth connector 34, wherein the baffle 3 is shaped like a "7". The driving mechanism 4 includes a third fixed seat 421 disposed on the side wall of the slide groove 11, a first swing block 422 hinged to the third fixed seat 421 and capable of swinging left and right, and a connecting rod 423 hinged between the first swing block 422 and the fourth connector 34. The push plate 6 includes a fifth push head 605 disposed on the front side and capable of pushing the first swing block 422 to swing its upper end away from the slide 22, and a sixth push head 606 disposed on the rear side and capable of pushing the first swing block 422 to swing its upper end away from the slide 22. Specifically, the lower end of the first swing block 422 can abut against the push plate 6, and the upper end of the first swing block 422 is hinged to one end of the connecting rod 423. A stop plate is provided on the push plate 6 near the slide block 22, and the fifth push head 605 and the sixth push head 606 are both mounted on this stop plate, with their heads being inclined surfaces. Thus, the push plate 6 pushes the first swing block 422 on the side away from the slide block 22, causing the upper end of the swing block to swing away from the slide block 22. This, in turn, pulls the baffle 3 via the connecting rod 423 hinged to the swing block, causing the baffle 3 to swing down and retract into the slide groove 11. The working principle of the sliding door is the same as above. Of course, the fifth push head 605 and the sixth push head 606 can also push the first swing block 422 not only through direct contact but also through non-contact methods, such as by having mutually repelling magnets on them.

[0043] The fourth embodiment of this solution refers to... Figures 13 to 15 The driving mechanism 4 includes a second swing block 431 disposed at the bottom of the baffle 3. The push plate 6 includes a seventh push head 607 disposed on the front side and capable of pushing the second swing block 431 to swing away from the slide block 22, and an eighth push head 608 disposed on the rear side and capable of pushing the second swing block 431 to swing away from the slide block 22. Specifically, the second swing block 431 and the baffle 3 are integrally formed. There is a top groove on the inner side of the second swing block 431. The upper end of the push plate 6 is provided with an arc-shaped top plate. The seventh push head 607 and the eighth push head 608 are both disposed on the top plate, and their heads are both inclined surfaces. Thus, during the movement of the push plate 6, the seventh push head 607 or the eighth push head 608 can be inserted into the top groove, and then push the second swing block 431 to swing away from the slide block 22, thereby causing the baffle 3 to be retracted into the slide groove 11. The working principle of the sliding door is the same as above. Of course, the seventh pusher 607 and the eighth pusher 608 can push the second swing block 431 not only through the above-mentioned direct contact and abutment, but also through a non-contact method, such as having mutually repelling magnets on both.

[0044] In this solution, the drive mechanism 4 is a drive mechanism 4 that can drive the baffle 3 to swing downward by swinging up and down.

[0045] The fifth embodiment of this solution refers to... Figures 16 to 17 The bottom of the baffle 3 is provided with a fifth connector 35. The driving mechanism 4 includes a fourth fixed seat 441 disposed on the bottom wall of the slide 11, a third swing block 442 hinged to the fourth fixed seat 441 and capable of swinging up and down, a pulley seat 443 disposed on the side wall of the slide 11, and a hinge 444 disposed between the fifth connector 35 and the third swing block 442 and passing through the pulley seat 443. The push plate 6 includes a ninth push head 609 disposed on the front side and capable of pushing the third swing block 442 downward, and a tenth push head 610 disposed on the rear side and capable of pushing the third swing block 442 downward. Specifically, the lower end of the push plate 6 is provided with a top plate, and the ninth push head 609 and the tenth push head 610 are both disposed on the top plate, and their heads are both inclined surfaces. The fifth connector 35 is disposed on the extended end of the baffle 3. Thus, during the movement of the push plate 6, the ninth push head 609 or the tenth push head 610 on it can press down the third swing block 442, and then pull the baffle 3 through the hinge 444, so that the baffle 3 swings down and is housed in the slide groove 11. During this process, the pulley seat 443 uses pulleys on it to change the direction of the hinge 444, preventing it from obstructing the movement of the push plate 6. The working principle of the sliding door is the same as above. Of course, the ninth push head 609 or the tenth push head 610 can push the third swing block 442 not only through the above-mentioned direct contact but also through a non-contact method, such as by providing mutually repelling magnets on both. Simultaneously, a lever structure can be provided between the hinge 444 and the third swing block 442 to increase the stroke of the hinge 444 when the third swing block 442 swings down.

[0046] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sliding door with a concealed track, comprising a track (1) and a sliding door (2) disposed on the track (1), wherein the track (1) includes a groove (11) for the sliding door (2) to slide back and forth, characterized in that, The track (1) is provided with several baffles (3) that can swing up and down in the slide (11) to cover the slide (11). The slide (11) is provided with a drive mechanism (4) that can drive the baffles (3) to swing down. The baffles (3) and the track (1) are provided with a return spring (5) that can make the baffles (3) swing up and reset. The bottom of the sliding door (2) and located in the slide (11) is provided with a push plate (6) that can push the drive mechanism (4) to move.

2. A sliding door with a concealed track according to claim 1, characterized in that, The left and right sides of the slide groove (11) are both C-shaped, so that a receiving cavity is formed in the slide groove (11) to accommodate the drive mechanism (4); the sliding door (2) includes a door body (21) and a slide block (22) disposed at the bottom of the door body (21) and slidable in the slide groove (11). The slide block (22) is I-shaped, and the push plate (6) is disposed on the left or right side of the slide block (22).

3. A sliding door with a concealed track according to claim 2, characterized in that, The upper sidewall of the slide (11) is provided with a plurality of first joints (12) spaced apart. The baffle (3) is provided with a first connector (31) located between two adjacent first joints (12). The first connector (31) is provided with a first hinge hole (311). Both sides of the first joint (12) are provided with a second hinge hole (121) that can communicate with the first hinge hole (311). The track (1) is provided with a first hinge shaft (7) that can pass through the second hinge hole (121), the first hinge hole (311) and the second hinge hole (121) in sequence to make the baffle (3) hinged to the track (1). There is a gap between the first joint (12) and the first connector (31). The return spring (5) is sleeved on the first hinge shaft (7). One end of the return spring (5) abuts against the bottom surface of the baffle (3) and the other end abuts against the upper sidewall of the slide (11).

4. A sliding door with a concealed track according to claim 3, characterized in that, The drive mechanism (4) is a drive mechanism (4) that can drive the baffle (3) to swing down by moving left and right.

5. A sliding door with a concealed track according to claim 4, characterized in that, The bottom of the baffle (3) is provided with a second connector (32). The driving mechanism (4) includes a first fixed seat (401) disposed on the side wall of the slide (11), a first moving block (402) disposed on the first fixed seat (401) and movable left and right, a swing arm (403) rotatably connected to the first moving block (402) and hinged to the second connector (32), and a stop block (404) disposed at the bottom of the first moving block (402). The push plate (6) includes a first push head (601) disposed on the front side and capable of pushing the stop block (404) to move away from the slide (22), and a second push head (602) disposed on the rear side and capable of pushing the stop block (404) to move away from the slide (22).

6. A sliding door with a concealed track according to claim 4, characterized in that, The bottom of the baffle (3) is provided with a third connector (33). The driving mechanism (4) includes a second fixed seat (411) disposed on the side wall of the slide (11), a second moving block (412) disposed on the second fixed seat (411) and movable left and right, and a push block (413) disposed on the top of the second moving block (412) and whose other end is drivenly connected to the third connector (33). The push plate (6) includes a third push head (603) disposed on the front side and capable of pushing the second moving block (412) to move away from the slide (22), and a fourth push head (604) disposed on the rear side and capable of pushing the second moving block (412) to move away from the slide (22).

7. A sliding door with a concealed track according to claim 3, characterized in that, The drive mechanism (4) is a drive mechanism (4) that can drive the baffle (3) to swing downward by swinging left and right.

8. A sliding door with a concealed track according to claim 7, characterized in that, The bottom of the baffle (3) is provided with a fourth connector (34). The drive mechanism (4) includes a third fixed seat (421) disposed on the side wall of the slide (11), a first swing block (422) hinged to the third fixed seat (421) and swingable left and right, and a connecting rod (423) hinged between the first swing block (422) and the fourth connector (34). The push plate (6) includes a fifth push head (605) disposed on the front side and capable of pushing the first swing block (422) to swing away from the slide (22), and a sixth push head (606) disposed on the rear side and capable of pushing the first swing block (422) to swing away from the slide (22).

9. A sliding door with a concealed track according to claim 7, characterized in that, The drive mechanism (4) includes a second swing block (431) at the bottom of the baffle (3); the push plate (6) includes a seventh pusher (607) located on the front side and capable of pushing the second swing block (431) to swing away from the slide (22), and an eighth pusher (608) located on the rear side and capable of pushing the second swing block (431) to swing away from the slide (22).

10. A sliding door with a concealed track according to claim 3, characterized in that, The driving mechanism (4) is a driving mechanism (4) that can drive the baffle (3) to swing down by swinging up and down; the bottom of the baffle (3) is provided with a fifth connector (35); the driving mechanism (4) includes a fourth fixed seat (441) provided on the bottom wall of the slide (11), a third swing block (442) hinged to the fourth fixed seat (441) and swinging up and down, a pulley seat (443) provided on the side wall of the slide (11), and a hinge (444) provided between the fifth connector (35) and the third swing block (442) and passing through the pulley seat (443); the push plate (6) includes a ninth push head (609) provided on the front side and able to push the third swing block (442) to swing down, and a tenth push head (610) provided on the rear side and able to push the third swing block (442) to swing down.

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