Stable vehicle locking device for deep vertical shaft tunneling construction

Abstract

The utility model discloses a stable vehicle locking device for deep shaft tunneling construction, which belongs to the technical field of deep shaft stable vehicle locking, and comprises a stable vehicle base and a stable vehicle brake disc arranged on the stable vehicle base, and further comprises locking holes uniformly distributed on the stable vehicle brake disc; the locking mechanism is used for being matched with the locking hole to limit the locking hole; according to the scheme, the transmission part of the locking mechanism is operated to drive the outer sleeve plate and the connecting base to rotate, meanwhile, the transmission part can drive the limiting plate to move towards the interior of the outer sleeve plate so that the limiting plate can correspond to the position of the locking hole in the stable brake disc, the position of the limiting part does not need to be adjusted independently, time and labor are saved, and the working efficiency is high; and then the limiting component is operated to be matched with the locking hole to limit and fix the stable brake disc, so that the situation that a stable suspended object suddenly falls off due to braking failure of a brake disc of the safety brake and impact damage of a backstop is greatly avoided, the braking effect of the stable vehicle is greatly improved, and the safety is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of deep shaft vehicle stabilization and locking, and more specifically relates to a vehicle stabilization and locking device for deep shaft excavation construction. Background Art

[0002] A stabilizer, also known as a crane, is a mobile lifting equipment mainly used for loading and unloading goods. Stabilizers are mostly used to suspend hoisting plates and tunneling equipment such as full-section tunnel boring machines in shaft excavation projects in mines and other vertical shafts. In the existing stabilizer standards, the maximum pulling force is 40 tons. The weight of a full-section tunnel boring machine in a vertical shaft reaches hundreds or even thousands of tons. When a full-section tunnel boring machine is used for excavation construction in a deep vertical shaft, 4-10 stabilizers are generally used for joint suspension.

[0003] During normal operation, the stabilizing vehicle suspends the rear supporting parts of the full-section tunnel boring machine for suspension and lifting operations; when the tunneling working face encounters an emergency (such as water gushing), the stabilizing vehicle needs to lift the rear supporting parts of the full-section tunnel boring machine for 8-15m and then stop, the stabilizing vehicle will self-lock, and then the main machine of the full-section tunnel boring machine will be lifted away from the working face to facilitate disaster management work.

[0004] When the existing vehicle is parked, it will be self-locked by the safety brake and the backstop. The safety brake uses electro-hydraulic control to clamp the brake disc of the spindle device, thereby generating friction for braking. The reliability is relatively low. When it is worn to a certain extent, the effect becomes worse, affecting the braking effect. There is a large gap between the ratchet and pawl mechanisms in the backstop, and a large impact will be generated when the backstop is in action, so there are certain safety hazards when the vehicle is parked, and the braking reliability is poor.

[0005] Therefore, it is necessary to provide a vehicle stabilizing locking device for deep shaft excavation construction to solve the above technical problems. Utility Model Content

[0006] The utility model aims to provide a vehicle stabilizing and locking device for deep shaft excavation construction to solve the above technical problems.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A vehicle stabilizing and locking device for deep shaft excavation construction, comprising a vehicle stabilizing base and a vehicle stabilizing brake disc arranged thereon, and also comprising:

[0009] A plurality of locking holes are provided and evenly distributed on the brake disc;

[0010] A locking mechanism, disposed on the vehicle stabilizing base, for cooperating with the locking hole to restrict the vehicle stabilizing brake disc;

[0011] The locking mechanism includes a connecting seat arranged on the stabilizing base, two outer sleeve plates are rotatably arranged on the connecting seat, a limiting plate is movably inserted inside the outer sleeve plate, a limiting component matching the locking hole is arranged on the limiting plate, and a transmission component is arranged on the connecting seat for driving the outer sleeve plate to rotate and moving the limiting plate at the same time.

[0012] Furthermore, two supports are arranged on the connecting seat, a first rotating shaft is rotatably arranged between the two supports via a bearing, and the two outer sleeve plates are both arranged on the first rotating shaft.

[0013] Furthermore, the transmission component includes:

[0014] A transmission seat is arranged on the connecting seat, a transmission cavity is opened in the transmission seat, and a worm gear is arranged at one end of the first rotating shaft extending into the transmission cavity;

[0015] A rotating rod is rotatably arranged on the inner wall of the transmission cavity through a bearing, and a worm meshing with the worm wheel is arranged on the rotating rod;

[0016] The linkage assembly is arranged on the support and is used to drive the limiting plate to move when the first rotating shaft rotates.

[0017] Furthermore, an inner displacement cavity is provided inside the outer sleeve plate and is slidably fitted with the outer wall of the limiting plate, and a first elastic member is provided between the limiting plate and the inner displacement cavity;

[0018] The linkage assembly includes a second rotating shaft rotatably arranged between the two supports through a bearing, the second rotating shaft is provided with a second gear and two rope winding wheels, a traction rope is wound around the rope winding wheels, the other end of the traction rope extends into the inner movement cavity and is connected to the limiting plate, and the first rotating shaft is provided with a first gear meshing with the second gear.

[0019] Furthermore, a socket is provided on the limiting plate, and the limiting component includes a column tube arranged on one of the limiting plates, a sliding cavity is provided in the column tube, a limiting column adapted to the socket is slidably provided in the sliding cavity, a second elastic member is provided between the limiting column and the inner wall of the sliding cavity, and a blocking component is provided on the limiting column.

[0020] Furthermore, the blocking assembly includes a blocking block slidably inserted into the limiting column, and a third elastic member is provided between the blocking block and the inner wall of the limiting column.

[0021] Furthermore, a sliding groove is provided on the inner wall of the sliding cavity, and a sliding block connected to the limiting column is slidably provided on the inner wall of the sliding groove.

[0022] Furthermore, a displacement groove communicating with the sliding cavity is formed on the outer wall of the column tube, a push rod is slidably provided on the inner wall of the displacement groove, and the bottom of the push rod is connected to the limiting column.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The locking mechanism of the present invention is a kind of control mechanism that is used for the locking of the locking mechanism, and the locking mechanism of the locking mechanism is a kind of control mechanism that is used for the locking of the locking mechanism.

[0025] 2. In this solution, when the limiting component is located at the position of the locking hole, the limiting column can be pushed to move toward the outside of the column tube, so that the limiting column passes through the locking hole on the stabilizing brake disc and is inserted through the insertion hole on another limiting plate. Then, through the cooperation of the blocking component and the limiting plate, the position of the limiting column can be limited and fixed. The limiting column can play a role in limiting and fixing the stabilizing brake disc, which can greatly improve the locking stability of the stabilizing brake disc. It avoids the current use of additional parts and avoids the steps of frequent disassembly and installation, saving a lot of manpower and material resources, and has high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the position structure of the vehicle stabilizing base, vehicle stabilizing brake disc and locking mechanism of the utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the locking mechanism of the utility model before use;

[0028] Figure 3 for Figure 2 The enlarged structural diagram at A in the middle;

[0029] Figure 4 for Figure 2 The enlarged structural diagram at B in the middle;

[0030] Figure 5 This is a schematic diagram of the cross-sectional structure of the transmission seat of the utility model;

[0031] Figure 6 This is a schematic diagram of the internal structure of the outer jacket plate of the utility model;

[0032] Figure 7 This is a schematic diagram of the cross-sectional structure of the column of the utility model;

[0033] Figure 8 This is a schematic diagram of the partial internal cross-section structure of the restriction column of the utility model;

[0034] Fig. 9 This is a schematic diagram of the state structure of the locking mechanism of the utility model when in use.

[0035] Description of the numbers in the figure:

[0036] 1. Car stabilizing base; 2. Car stabilizing brake disc; 3. Locking hole; 4. Locking mechanism; 41. Connecting seat; 42. Outer plate; 43. Limiting plate; 44. Limiting component; 441. Column; 442. Sliding cavity; 443. Limiting column; 444. Second elastic member; 445. Blocking assembly; 4451. Block; 4452. Third elastic member; 45. Transmission component; 451. Transmission seat; 452. Transmission cavity; 453. Worm gear; 454. Rotating rod; 455. Worm; 456. Linkage assembly; 4561. Second rotating shaft; 4562. Second gear; 4563. Rope wheel; 4564. Traction rope; 4565. First gear; 5. Support; 6. First rotating shaft; 7. Inner displacement cavity; 8. First elastic member; 9. Socket; 10. Slide groove; 11. Sliding block; 12. Shifting groove; 13. Push rod. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] See also Figure 1-2 and Fig. 9A vehicle stabilizing and locking device for deep shaft excavation construction comprises a vehicle stabilizing base 1 and a vehicle stabilizing brake disc 2 arranged thereon, and also comprises: a locking hole 3, which is provided with a plurality of and evenly distributed on the vehicle stabilizing brake disc 2; a locking mechanism 4, which is provided on the vehicle stabilizing base 1 and is used to cooperate with the locking hole 3 to restrict the vehicle stabilizing brake disc 2; the locking mechanism 4 comprises a connecting seat 41 provided on the vehicle stabilizing base 1, on which two outer sleeves 42 are rotatably provided, and a limiting plate 43 is movably inserted inside the outer sleeve 42, and a limiting component 44 matching the locking hole 3 is provided on the limiting plate 43, and a transmission component 45 is provided on the connecting seat 41, which is used to drive the outer sleeve 42 to rotate while moving the limiting plate 43.

[0039] When in use, when the stabilizing vehicle is parked, after the stabilizing vehicle is self-locked by its own safety brake and backstop, at this time, according to the locking hole 3 on the stabilizing vehicle brake disc 2 closest to the locking mechanism 4, the transmission component 45 of the locking mechanism 4 is operated to drive the outer cover plate 42 and the connecting seat 41 to rotate, such as Figure 1 For example, at this time, the two outer plates 42 and the limiting plate 43 rotate counterclockwise toward the direction of the vehicle stabilizing brake disc 2, and the two limiting plates 43 will gradually be on both sides of the vehicle stabilizing brake disc 2. At the same time, the limiting plates 43 will be driven to move through the transmission component 45. At this time, the limiting plates 43 will move toward the inside of the outer plates 42, and the limiting plates 43 will drive the limiting components 44 to move together, and then the position of the limiting components 44 can be adjusted by rotating the limiting plates 43 and moving along the outer plates 42, and finally the limiting components 44 will be rotated to the position of the locking hole 3 on the vehicle stabilizing brake disc 2. The linkage is good, and there is no need to adjust the position of the limiting components 44 separately, which saves time and effort and has high work efficiency. After that, the limiting components 44 are operated to cooperate with the locking hole 3 to limit and fix the vehicle stabilizing brake disc 2, such as Fig. 9 Therefore, on the basis of the self-locking of the vehicle stabilizing safety brake and the check, the locking mechanism 4 is used to further restrict the vehicle stabilizing brake disc 2, which can greatly avoid the brake disc failure of the safety brake and the impact damage of the check, which may cause the suspension plate of the vehicle stabilizing suspension and the tunnel boring machine to suddenly fall, greatly improving the braking effect of the vehicle stabilizing, and the reliability of the vehicle stabilizing brake is high, reducing the occurrence of safety hazards during the use of the vehicle stabilizing, and with the promotion of the construction of the full-section tunnel boring machine with vehicle stabilizing suspension, its application prospects are broad.

[0040] In this embodiment, preferably, please refer to Figure 2-3 and Fig. 9 Two supports 5 are arranged on the connecting seat 41, and a first rotating shaft 6 is rotatably arranged between the two supports 5 through a bearing, and two outer sleeve plates 42 are arranged on the first rotating shaft 6. The two outer sleeve plates 42 rotate together with the rotation of the first rotating shaft 6, and the first rotating shaft 6 is supported and installed by the two supports 5.

[0041] In this embodiment, preferably, please refer to Figure 2 , Figure 5 and Fig. 9 The transmission component 45 includes: a transmission seat 451, which is arranged on the connection seat 41, and a transmission cavity 452 is provided in the transmission seat 451. A worm gear 453 is provided at one end of the first rotating shaft 6 extending into the transmission cavity 452; a rotating rod 454, which is rotatably arranged on the inner wall of the transmission cavity 452 through a bearing, and a worm 455 meshing with the worm gear 453 is provided on the rotating rod 454; and a linkage assembly 456, which is arranged on the support 5 and is used to drive the limiting plate 43 to move when the first rotating shaft 6 rotates. The rotating rod 454 will drive the worm 455 to rotate, and the worm 455 will drive the worm gear 453 and the first rotating shaft 6 to rotate. When the first rotating shaft 6 rotates, the two outer sleeve plates 42 will be driven to rotate, that is, the limiting plate 43 and the limiting component 44 will be driven to rotate. And through the self-locking property of the worm 455 and the worm wheel 453, when the rotating rod 454 is not rotated, the worm wheel 453 will not rotate, and the worm wheel 453 can only be driven to rotate by the worm 455, but not vice versa, which can ensure the stability of the outer sleeve 42, the limiting plate 43 and the limiting component 44 after rotation.

[0042] In this embodiment, preferably, please refer to Figure 2-3 and Figure 6 The outer sleeve 42 is provided with an inner movement cavity 7 which is slidably fitted with the outer wall of the limiting plate 43; a first elastic member 8 is provided between the limiting plate 43 and the inner movement cavity 7; the first elastic member 8 in the present application is a spring; the linkage assembly 456 includes a second rotating shaft 4561 which is rotatably arranged between the two supports 5 through a bearing; the second rotating shaft 4561 is provided with a second gear 4562 and two rope winding wheels 4563; a traction rope 4564 is wound around the rope winding wheels 4563; the other end of the traction rope 4564 extends into the inner movement cavity 7 and is connected to the limiting plate 43; a first gear 4565 which is meshed with the second gear 4562 is provided on the first rotating shaft 6.

[0043] by Figure 1 and Fig. 9As an example, when the stabilizing brake disc 2 needs to be locked, it can be known from the above that the first rotating shaft 6 rotates to drive the two outer sleeves 42 to rotate counterclockwise, and at this time the outer sleeve 42 drives the limiting plate 43 and the limiting component 44 to rotate counterclockwise, and the limiting plate 43 and the limiting component 44 rotate toward the direction close to the stabilizing brake disc 2; at the same time, the first rotating shaft 6 will synchronously drive the first gear 4565 to rotate counterclockwise, and the first gear 4565 will drive the second gear 4562 and the second rotating shaft 4561 to rotate clockwise, and the second rotating shaft 4561 will drive the rope wheel 4563 to rotate clockwise, and the rope wheel 4563 will gradually wind and tighten the traction rope 4 564, the other end of the traction rope 4564 will pull the limiting plate 43, so that the limiting plate 43 moves toward the inside of the inner displacement chamber 7, and compresses the first elastic member 8 at the same time, so that the limiting plate 43 and the limiting component 44 move toward the inside of the outer plate 42 while moving toward the stabilizing brake disc 2, so that the position of the limiting component 44 relative to the locking hole 3 on the stabilizing brake disc 2 can be accurately adjusted until the limiting component 44 corresponds to the locking hole 3, and then the stabilizing brake disc 2 is restricted and fixed by the limiting component 44 and the locking hole 3, with good linkage, no need to adjust the position of the limiting component 44 separately, time-saving, labor-saving and high efficiency. When it is not necessary to lock the stabilizing brake disc 2, when the outer plate 42 drives the limiting plate 43 and the limiting component 44 to rotate clockwise to reset, the rebound force of the first elastic member 8 will also cause the limiting plate 43 to move toward the outside of the inner displacement chamber 7 to reset, waiting for the next use, and so on and so forth, which is highly practical.

[0044] In this embodiment, preferably, please refer to Figure 1-2 , Figure 4 and Figure 7-9 A socket 9 is provided on the limiting plate 43, and the limiting component 44 includes a column 441 arranged on one of the limiting plates 43, a sliding cavity 442 is provided in the column 441, and a limiting column 443 adapted to the socket 9 is slidably provided in the sliding cavity 442, and a second elastic member 444 is provided between the limiting column 443 and the inner wall of the sliding cavity 442. The second elastic member 444 in the present application is a spring, and a blocking component 445 is provided on the limiting column 443.

[0045] When the limiting component 44 is located at the position of the locking hole 3, the limiting column 443 can be pushed to slide along the sliding cavity 442, and the limiting column 443 can move toward the outside of the column tube 441, and the second elastic member 444 is stretched, and then the limiting column 443 passes through the locking hole 3 on the stabilizing brake disc 2 and is inserted through the insertion hole 9 on another limiting plate 43, and then the position of the limiting column 443 is limited and fixed by the cooperation of the blocking component 445 and the limiting plate 43. At this time, the limiting column 443 can play a role in limiting and fixing the stabilizing brake disc 2, which can greatly improve the locking stability of the stabilizing brake disc 2. It can also avoid the current situation that other parts such as latches are used to insert the locking hole 3 to lock, which makes the operation process cumbersome, avoid frequent removal and installation steps, save a lot of manpower and material resources, and do not need to carry other parts, which is highly efficient.

[0046] In this embodiment, preferably, please refer to Figure 7-9 The blocking assembly 445 includes a block 4451 that is slidably inserted into the limiting column 443. A third elastic member 4452 is provided between the block 4451 and the inner wall of the limiting column 443. The third elastic member 4452 in the present application is a spring. When the limiting column 443 is inserted through the locking hole 3 and the insertion hole 9, the block 4451 will be squeezed and enter the inside of the limiting column 443, and compress the third elastic member 4452. When the limiting column 443 drives the block 4451 to be inserted to the corresponding position, the block 4451 is no longer squeezed, and the rebound force of the third elastic member 4452 will cause the block 4451 to move out of the limiting column 443. Fig. 9 As shown, the limiting column 443 can be limited by the cooperation of the stopper 4451 and the limiting plate 43, so that the limiting column 443 is inserted through the locking hole 3 on the stabilizing brake disc 2 to lock and limit the stabilizing brake disc 2.

[0047] In this embodiment, preferably, please refer to Figure 7 The inner wall of the sliding cavity 442 is provided with a sliding groove 10, and a slider 11 connected to the limiting column 443 is slidably provided on the inner wall of the sliding groove 10. When the limiting column 443 moves along the sliding cavity 442, the limiting column 443 drives the slider 11 to slide along the sliding groove 10, thereby improving the movement stability of the limiting column 443, preventing it from rotating, and improving the subsequent limiting and locking effect of the stabilizing brake disc 2.

[0048] In this embodiment, preferably, please refer to Figure 2 and Figure 4 The outer wall of the column 441 is provided with a shifting groove 12 communicating with the sliding cavity 442, and a push rod 13 is slidably provided on the inner wall of the shifting groove 12, and the bottom of the push rod 13 is connected to the limiting column 443. When the limiting column 443 is moved, the push rod 13 can be pushed to move along the shifting groove 12, and the use of the push rod 13 can facilitate the movement of the limiting column 443.

[0049] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that satisfy both A and B. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

Claims

1. A vehicle stabilizing and locking device for deep shaft excavation construction, comprising a vehicle stabilizing base (1) and a vehicle stabilizing brake disc (2) arranged thereon, characterized in that: Also includes: A plurality of locking holes (3) are provided and evenly distributed on the vehicle stabilizing brake disc (2); A locking mechanism (4) is arranged on the vehicle stabilizing base (1) and is used to cooperate with the locking hole (3) to restrict the vehicle stabilizing brake disc (2); The locking mechanism (4) comprises a connecting seat (41) arranged on the stabilizing base (1), two outer plates (42) are rotatably arranged on the connecting seat (41), a limiting plate (43) is movably inserted inside the outer plate (42), a limiting component (44) matching with the locking hole (3) is arranged on the limiting plate (43), and a transmission component (45) is arranged on the connecting seat (41) for driving the outer plate (42) to rotate and moving the limiting plate (43) at the same time.

2. A vehicle stabilizing and locking device for deep shaft excavation construction according to claim 1, characterized in that: Two supports (5) are arranged on the connecting seat (41), a first rotating shaft (6) is rotatably arranged between the two supports (5) via a bearing, and the two outer sleeve plates (42) are both arranged on the first rotating shaft (6).

3. A vehicle stabilizing and locking device for deep shaft excavation construction according to claim 2, characterized in that: The transmission component (45) comprises: A transmission seat (451) is arranged on the connecting seat (41), a transmission cavity (452) is provided in the transmission seat (451), and a worm gear (453) is provided at one end of the first rotating shaft (6) extending into the transmission cavity (452); A rotating rod (454) is rotatably disposed on the inner wall of the transmission chamber (452) via a bearing, and a worm (455) meshing with the worm wheel (453) is disposed on the rotating rod (454); A linkage assembly (456) is disposed on the support (5) and is used to drive the limiting plate (43) to move when the first rotating shaft (6) rotates.

4. A vehicle stabilizing and locking device for deep shaft excavation construction according to claim 3, characterized in that: The outer sleeve (42) is provided with an inner displacement cavity (7) which is slidably fitted with the outer wall of the limiting plate (43), and a first elastic member (8) is provided between the limiting plate (43) and the inner displacement cavity (7); The linkage assembly (456) includes a second rotating shaft (4561) which is rotatably arranged between the two supports (5) through a bearing, and a second gear (4562) and two rope winding wheels (4563) are provided on the second rotating shaft (4561). A traction rope (4564) is wound around the rope winding wheel (4563), and the other end of the traction rope (4564) extends into the inner displacement cavity (7) and is connected to the limiting plate (43). The first rotating shaft (6) is provided with a first gear (4565) which meshes with the second gear (4562).

5. The vehicle stabilizing and locking device for deep shaft excavation construction according to claim 1 is characterized in that: The limiting plate (43) is provided with an insertion hole (9), and the limiting component (44) includes a column tube (441) arranged on one of the limiting plates (43), a sliding cavity (442) is provided in the column tube (441), a limiting column (443) adapted to the insertion hole (9) is slidably provided in the sliding cavity (442), a second elastic member (444) is provided between the limiting column (443) and the inner wall of the sliding cavity (442), and a blocking component (445) is provided on the limiting column (443).

6. A vehicle stabilizing and locking device for deep shaft excavation construction according to claim 5, characterized in that: The blocking assembly (445) comprises a blocking block (4451) slidably inserted into the limiting column (443), and a third elastic member (4452) is provided between the blocking block (4451) and the inner wall of the limiting column (443).

7. A vehicle stabilizing and locking device for deep shaft excavation construction according to claim 6, characterized in that: The inner wall of the sliding cavity (442) is provided with a sliding groove (10), and the inner wall of the sliding groove (10) is slidably provided with a sliding block (11) connected to the limiting column (443).

8. The vehicle stabilizing and locking device for deep shaft excavation construction according to claim 5, characterized in that: The outer wall of the column tube (441) is provided with a shift groove (12) communicating with the sliding cavity (442), and the inner wall of the shift groove (12) is slidably provided with a push rod (13), and the bottom of the push rod (13) is connected to the limiting column (443).

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