Hoisting mechanism with limiting structure

Abstract

The utility model relates to a hoisting mechanism with a limiting structure, which comprises a hoisting frame, a limiting structure and a lifting mechanism, the lifting power assembly is used as a power source for hoisting; the limiting assembly comprises a sleeve, a first limiting switch, a second limiting switch, a trigger rod and a spring, the sleeve is arranged on the lifting frame, the spring is arranged in the sleeve, one end of the trigger rod extends into the sleeve to be connected with the spring, and the other end of the trigger rod is located in the sleeve and used for making contact with an obstacle; the first limiting switch and the second limiting switch are both installed on the sleeve, the signal end of the first limiting switch and the signal end of the second limiting switch extend into the sleeve, and the first limiting switch and the second limiting switch are used for sensing the position, extending into the sleeve, of the trigger rod. According to the hoisting mechanism with the limiting structure, the limiting assembly triggers the limiting switch through the trigger rod, so that the hoisting height of a duct piece can be effectively controlled, and the operation safety is ensured.

Description

Technical Field

[0001] This utility model relates to the field of lifting and hoisting equipment technology, and in particular to a hoisting mechanism with a limiting structure. Background Technology

[0002] As the main form of subway transportation, the efficiency, technology, and safety of underground tunnel construction are of great importance to everyone.

[0003] Currently, underground tunnel construction generally employs large-scale tunnel boring machines (TBMs) for excavation, while utilizing precast concrete segments for support. This method is fast, efficient, highly mechanized, has minimal environmental impact, and ensures high-quality tunnel construction. As a crucial precast component in subway tunnel engineering, the reliability and efficiency of segment transportation directly affect the safety and progress of tunnel construction. Segment transportation typically utilizes segment lifting equipment, which is used to hoist the segments to designated locations for assembly.

[0004] During the operation of the segment hoisting equipment in the tunnel, due to the relatively narrow working space in the tunnel, the entire running track will have a certain slope, and there will also be a certain turning angle when running horizontally. When using the lifting device to lift the lifting equipment, since the lifting device and the lifting equipment are flexibly connected, during horizontal turns, especially when accelerating, decelerating and climbing, the inertia will cause swaying. Excessive swaying amplitude will cause the segment to interfere with other shield structures, resulting in damage to the segment. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the problem in the prior art that the excessive swing amplitude of the tunnel segments caused by the segment hoisting equipment running on complex tracks leads to interference with other shield structures.

[0006] To solve the above-mentioned technical problems, this utility model provides a hoisting mechanism with a limiting structure, comprising: a hoisting frame, which serves as a hoisting support component; a hoisting power assembly, at least one of which is mounted on the hoisting frame and serves as a power source for hoisting; and a limiting assembly, mounted on the hoisting frame, the limiting assembly including a sleeve, a first limiting switch, a second limiting switch, a trigger rod, and a spring. The sleeve is disposed on the hoisting frame, the spring is disposed inside the sleeve, one end of the trigger rod extends into the sleeve and connects to the spring, and the other end of the trigger rod is located in the sleeve for contacting an obstacle. The first and second limiting switches are both mounted on the sleeve, and the signal ends of the first and second limiting switches extend into the sleeve. The first and second limiting switches are used to sense the position of the trigger rod extending into the sleeve.

[0007] In one embodiment of the present invention, the sleeve has a cavity inside, and the cavity extends to one end of the sleeve along the axial direction to form an opening. A cover plate is connected to the sleeve, and the cover plate covers the opening. One end of the spring abuts against the cover plate.

[0008] In one embodiment of this utility model, the sleeve is provided with a self-lubricating bearing at the other end opposite to the cover plate, and the trigger rod is slidably connected to the self-lubricating bearing.

[0009] In one embodiment of this utility model, the trigger rod has a boss at one end located in the cavity, a spring limiting groove is provided on the boss, and one end of the spring is disposed in the spring limiting groove.

[0010] In one embodiment of the present invention, the outer wall of the sleeve is provided with a mounting plate, and the mounting plate is locked to the lifting frame by fasteners.

[0011] In one embodiment of this utility model, the lifting power assembly includes a lifting motor, a sprocket shaft, a chain, a lifting sprocket, a chain fixing block, and a chain box. The lifting motor is mounted on the lifting frame. One end of the sprocket shaft is connected to the rotating shaft of the lifting motor. The sprocket shaft, the lifting sprocket, the chain fixing block, and the chain box are all disposed on the lifting frame. One end of the chain is placed inside the chain box, and the other end of the chain is disposed on the chain fixing block. The chain winds around the lifting sprocket and the sprocket shaft, and the chain is used for hoisting.

[0012] In one embodiment of this utility model, the lifting frame is provided with a guide sprocket, and the ring chain is wound around the guide sprocket.

[0013] In one embodiment of this utility model, the lifting frame is provided with a bearing seat, and the sprocket shaft, guide sprocket and lifting sprocket are all mounted on the bearing seat.

[0014] In one embodiment of this utility model, anti-collision blocks are installed on the lifting frame.

[0015] In one embodiment of this utility model, two lifting power components are provided, and the two lifting power components are respectively located on both sides of the lifting frame, and the two lifting power components are staggered.

[0016] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0017] The lifting mechanism with a limiting structure described in this utility model has a limiting component that triggers a limit switch via a trigger rod to effectively control the lifting height of the tunnel segment and ensure operational safety. Power is provided by two lifting power components, which drive the connected lifting device to lift the tunnel segment. The two lifting power components are arranged diagonally on both sides of the lifting frame, which can effectively achieve the balance of the lifting mechanism during the lifting of heavy objects. Attached Figure Description

[0018] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] Figure 1 This is an exploded view of the hoisting mechanism with a limiting structure in a preferred embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the limiting component in a preferred embodiment of the present invention;

[0021] Figure 3 This is a cross-section of the limiting component in a preferred embodiment of the present invention. Figure 1 ;

[0022] Figure 4 This is a cross-section of the limiting component in a preferred embodiment of the present invention. Figure 2 ;

[0023] Figure 5 This is a cross-section of the limiting component in a preferred embodiment of the present invention. Figure 3 ;

[0024] Figure 6 This is a cross-section of the limiting component in a preferred embodiment of the present invention. Figure 4 ;

[0025] Figure 7 This is a schematic diagram of the lifting power assembly in a preferred embodiment of the present invention.

[0026] Explanation of reference numerals in the accompanying drawings: Lifting frame 1, bearing seat 11, chain guard 12, chain guard 2 13, anti-collision block 14, lifting power assembly 2, lifting motor 21, sprocket shaft 22, chain 23, lifting sprocket 24, chain fixing block 25, chain box 26, guide sprocket 27, limiting assembly 3, sleeve 31, cavity 311, first through hole 312, self-lubricating bearing 313, first limit switch 32, second limit switch 33, trigger rod 34, boss 341, spring limiting groove 342, spring 35, cover plate 36, mounting plate 37. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention. Example

[0028] Reference Figure 1 As shown, the hoisting mechanism with a limiting structure of this utility model includes several parts: a hoisting frame 1, a hoisting power assembly 2, and a limiting assembly 3; the hoisting frame 1 serves as a hoisting support component; at least one hoisting power assembly 2 is provided, which is installed on the hoisting frame 1 and serves as the power source for hoisting; the limiting assembly 3 is installed on the hoisting frame 1 and is used to prevent the hoisting frame 1 from colliding with other equipment.

[0029] Reference Figure 2-6 As shown, the limiting component 3 includes a sleeve 31, a first limiting switch 32, a second limiting switch 33, a trigger rod 34, and a spring 35. The sleeve 31 is mounted on the lifting frame 1, and the spring 35 is disposed inside the sleeve 31. One end of the trigger rod 34 extends into the sleeve 31 and connects to the spring 35, while the other end of the trigger rod 34 is located in the sleeve 31 for contact with an obstacle. The first limiting switch 32 and the second limiting switch 33 are both mounted on the sleeve 31, and their signal ends extend into the sleeve 31. The first limiting switch 32 and the second limiting switch 33 are used to sense the position of the trigger rod 34 extending into the sleeve 31. Preferably, there are two lifting power components 2, which are located on opposite sides of the lifting frame 1 and are staggered. The limit assembly 3 consists of a sleeve 31, a first limit switch 32, a second limit switch 33, a trigger rod 34, and a spring 35. The position of the trigger rod 34 is changed by the passive extension and retraction of the spring 35, thereby triggering the first limit switch 32 and the second limit switch 33.

[0030] In the above structure, the sleeve 31 has an internal cavity 311, and the cavity 311 extends to one end of the sleeve 31 along its axial direction to form an opening. A cover plate 36 is connected to the sleeve 31, and the cover plate 36 covers the opening. One end of the spring 35 abuts against the cover plate 36. A self-lubricating bearing 313 is provided at the other end of the sleeve 31 opposite to the cover plate 36, and the trigger rod 34 is slidably connected to the self-lubricating bearing 313. The self-lubricating bearing 313 can reduce friction during the axial movement of the trigger rod 34, preventing the trigger rod 34 from failing due to long-term wear. A first through hole 312 is provided at the other end of the sleeve 31 opposite to the cover plate 36. The first through hole 312 communicates with the cavity 311, and a self-lubricating bearing 313 is provided on the inner wall of the first through hole 312. The trigger rod 34 passes through the self-lubricating bearing 313, and the trigger rod 34 can slide within the self-lubricating bearing 313.

[0031] In the above structure, the trigger rod 34 has a boss 341 at one end inside the cavity 311, and a spring limiting groove 342 on the boss 341. One end of the spring 35 is disposed in the spring limiting groove 342. The spring 35 is disposed between the cover plate 36 and the spring limiting groove 342. When the trigger rod 34 encounters an obstacle, it will be pushed into the cavity 311. When the force between the trigger rod 34 and the obstacle is greater than the elastic force of the spring 35, the trigger rod 34 is pressed back into the cavity 311. After the trigger rod 34 is no longer in contact with the obstacle, under the action of the elastic force of the spring 35, the trigger rod 34 is pushed out of the cavity 311 and returns to its original position. The first limit switch 32 and the second limit switch 33 can trigger different alarm information by sensing the depth to which the trigger rod 34 is pressed back into the cavity 311, so as to ensure the safety of the hoisting operation.

[0032] In addition, the outer wall of the sleeve 31 is provided with a mounting plate 37, which is locked to the lifting frame 1 by fasteners.

[0033] The main function of the limiting component 3 is to prevent the segments from colliding with the upper lifting device during the lifting process.

[0034] The principle of the limit component 3 is as follows: it includes two limit switches, a first limit switch 32 and a second limit switch 33. The first limit switch 32 acts as a deceleration sensor, and the second limit switch 33 acts as a stop sensor. Figure 4In the initial state shown, a certain safe distance is maintained between the upper part of the trigger rod 34 and the trigger position of the first limit switch 32. When the upper part of the trigger rod 34 reaches the first trigger position, the first limit switch 32 is triggered, and the limit component 3 enters the deceleration trigger state. At this time, the hoisting power component 2 begins to decelerate. During the process from the first trigger position to the second trigger position, the hoisting power component 2 will continue to lift the tunnel segment at a lower speed. When the trigger rod 34 rises further to the second trigger position, the second limit switch 33 is triggered, the limit component 3 enters the stop trigger state, the hoisting power component 2 is de-energized and stops operating, thereby stopping the tunnel segment from rising and preventing collision with the superstructure. Example

[0035] Reference Figure 7 As shown, the lifting power assembly 2 includes a lifting motor 21, a sprocket shaft 22, a chain 23, a lifting sprocket 24, a chain fixing block 25, and a chain box 26. The lifting motor 21 is mounted on the lifting frame 1. One end of the sprocket shaft 22 is connected to the rotating shaft of the lifting motor 21. The sprocket shaft 22, lifting sprocket 24, chain fixing block 25, and chain box 26 are all disposed on the lifting frame 1. One end of the chain 23 is placed inside the chain box 26, and the other end of the chain 23 is disposed on the chain fixing block 25. The chain 23 is wound around the lifting sprocket 24 and the sprocket shaft 22, and is used for hoisting. The lifting frame 1 is provided with a guide sprocket 27, and the chain 23 is wound around the guide sprocket 27. Preferably, there are two lifting sprockets 24 and one guide sprocket 27, and the chain 23 is wound around the sprocket shaft 22, the guide sprocket 27, and the lifting sprocket 24. A first drooping section of the chain is provided between the chain fixing block 25 and the adjacent lifting sprocket 24. The two lifting sprockets 24 are adjacent to each other, and a second drooping section of the chain is provided between the adjacent lifting sprockets 24. The lowest ends of the first and second drooping sections of the chain are used to install the lifting wheel.

[0036] One end of the chain 23 is connected to the chain fixing block 25, and the other end of the chain 23 is placed inside the chain box 26. After passing the sprocket shaft 22, the chain 23 winds around the bottom of the guide sprocket 27 to one of the lifting sprockets 24; after passing the lifting sprocket 24, a second drooping section of the chain is released, which winds around the sprocket of the lifting device, and then winds around to the second lifting sprocket 24; then the first drooping section of the chain is released, which winds around the sprocket shaft on the same side of the lifting device, and then the end of the chain 23 is connected to the chain fixing block 25. The lifting motor 21 is connected to the sprocket shaft 22, and the load is borne by the sprocket shaft 22. The lifting sprocket 24 mainly serves to raise and lower the chain 23. The connecting shaft of the chain fixing block 25 is a sensor shaft, through which the low-headroom chain segment crane can monitor the lifting weight in real time and avoid overloading.

[0037] In the above structure, the lifting frame 1 is provided with a bearing seat 11, and the sprocket shaft 22, guide sprocket 27, and lifting sprocket 24 are all mounted on the bearing seat 11. The bearing seat 11 is provided with a first chain guard 12 and a second chain guard 13. The first chain guard 12 is used to cover the sprocket shaft 22, and the second chain guard 13 is used to cover the lifting sprocket 24. The first chain guard 12 and the second chain guard 13 can prevent chain jumping and also ensure smooth chain winding and unwinding, as well as accurate meshing conditions between the chain and the sprocket.

[0038] In the above structure, a crash barrier 14 is installed on the lifting frame 1. The crash barrier 14 is a limiting device to prevent the lifting equipment from colliding with the lifting mechanism during the lifting process.

[0039] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A hoisting mechanism with a limiting structure, characterized in that, include: The lifting frame serves as a hoisting support component; A lifting power assembly, comprising at least one, wherein the lifting power assembly is mounted on the lifting frame and serves as the power source for hoisting; A limiting assembly, mounted on a lifting frame, includes a sleeve, a first limiting switch, a second limiting switch, a trigger rod, and a spring. The sleeve is disposed on the lifting frame, and the spring is disposed inside the sleeve. One end of the trigger rod extends into the sleeve and connects to the spring, while the other end of the trigger rod is located in the sleeve for contact with an obstacle. Both the first and second limiting switches are mounted on the sleeve, and their signal ends extend into the sleeve. The first and second limiting switches are used to sense the position of the trigger rod extending into the sleeve.

2. The hoisting mechanism with a limiting structure according to claim 1, characterized in that: The sleeve has an internal cavity, and the cavity extends to one end of the sleeve along the axial direction to form an opening. A cover plate is connected to the sleeve, and the cover plate covers the opening. One end of the spring abuts against the cover plate.

3. The hoisting mechanism with a limiting structure according to claim 2, characterized in that: The sleeve is provided with a self-lubricating bearing at the other end opposite to the cover plate, and the trigger rod is slidably connected to the self-lubricating bearing.

4. The hoisting mechanism with a limiting structure according to claim 2, characterized in that: The trigger rod has a boss at one end inside the cavity, and a spring limiting groove is provided on the boss. One end of the spring is set in the spring limiting groove.

5. The hoisting mechanism with a limiting structure according to claim 1, characterized in that: The outer wall of the sleeve is provided with a mounting plate, which is locked to the lifting frame by fasteners.

6. The hoisting mechanism with a limiting structure according to claim 1, characterized in that: The lifting power assembly includes a lifting motor, a sprocket shaft, a chain, a lifting sprocket, a chain fixing block, and a chain box. The lifting motor is mounted on the lifting frame. One end of the sprocket shaft is connected to the rotating shaft of the lifting motor. The sprocket shaft, lifting sprocket, chain fixing block, and chain box are all located on the lifting frame. One end of the chain is placed inside the chain box, and the other end of the chain is located on the chain fixing block. The chain winds around the lifting sprocket and the sprocket shaft and is used for lifting.

7. The hoisting mechanism with a limiting structure according to claim 6, characterized in that: The lifting frame is equipped with a guide sprocket, and the chain is wound around the guide sprocket.

8. The hoisting mechanism with a limiting structure according to claim 7, characterized in that: The lifting frame is provided with a bearing seat, and the sprocket shaft, guide sprocket and lifting sprocket are all mounted on the bearing seat.

9. The hoisting mechanism with a limiting structure according to claim 1, characterized in that: The lifting frame is equipped with anti-collision blocks.

10. The hoisting mechanism with a limiting structure according to claim 1, characterized in that: The lifting power assembly is configured as two, and the two lifting power assemblies are located on both sides of the lifting frame, and the two lifting power assemblies are staggered.

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