CN216512568U

CN216512568U - Tower crane hoisting mechanism stop device

Info

Publication number: CN216512568U
Application number: CN202123142565.8U
Authority: CN
Inventors: 高君; 孙磊; 季军; 马成龙
Original assignee: Hefei Zhongbao Machinery Manufacturing Co ltd
Current assignee: Hefei Zhongbao Machinery Manufacturing Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-05-13
Anticipated expiration: 2031-12-14

Abstract

The utility model relates to a limiting device for a lifting mechanism of a tower crane, which comprises a tower crane mounting frame, a lifting mechanism, a hook assembly, a fixing plate, a lifting rod and a friction limiting block. The lifting mechanism is installed at one end of the tower crane installation frame. The lifting hook component is connected with the lifting mechanism through a steel wire rope; the lifting mechanism drives the lifting hook assembly to lift along the vertical direction. The fixed plate is installed on tower machine mounting bracket lower surface. The lifting rod movably penetrates through the fixing plate along the vertical direction; one end of the lifting rod, which is positioned below the fixed plate, is provided with a lifting block, and the other end of the lifting rod points to the steel wire rope; the lifting block and the fixing plate are provided with return springs. The friction limiting block is arranged on a tower crane mounting frame right above the lifting rod. Above-mentioned tower machine hoisting mechanism stop device, if hoist mechanism fails in time to brake, the lifting hook subassembly continues the upward movement, and lifter and friction stopper can firmly centre gripping wire rope, make wire rope's transmission stop, play the effect of mechanical braking, prevent to push against, protection device has improved the security.

Description

Tower crane hoisting mechanism stop device

Technical Field

The utility model relates to the field of engineering machinery, in particular to a limiting device for a lifting mechanism of a tower crane.

Background

The upper limit of the tower crane hoisting mechanism mainly uses a multifunctional travel switch at present, and the reliability of the upper limit of the tower crane is directly related to the product quality of the multifunctional travel switch and the calibration and debugging during installation and debugging. At present, most reasons of the top impact accident of the tower crane hook are the following two conditions: the first upward limiting device is damaged due to long-term maintenance or is not locked after the upper limiting device is set and adjusted, the displacement is generated in the operation process, the limiting effect is lost, and an operator does not concentrate on the idea when receiving the lifting hook and cannot notice that the upper limiting device goes wrong, so that the top rushing occurs. The position allowance of the upper limit setting of the second debugging personnel is too small when the debugging height is limited, the deceleration time of a plurality of frequency conversion tower cranes is set to be longer at present, and a lifting motor still needs a section of deceleration stroke even if receiving a stop command, so that the top rushing accident occurs in the deceleration process.

Most of the existing limiting devices are not designed with mechanical buffer structures, and when a travel switch cannot act in time, a top-rushing accident is easy to happen, and the danger is very high.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a limiting device for a lifting mechanism of a tower crane, aiming at the problem that most of the existing limiting devices are not designed with mechanical buffer structures.

A limiting device for a lifting mechanism of a tower crane comprises a tower crane mounting frame, a lifting mechanism, a hook assembly, a fixing plate, a lifting rod and a friction limiting block. The lifting mechanism is installed at one end of the tower crane installation frame. The lifting hook component is connected with the lifting mechanism through a steel wire rope; the lifting mechanism drives the lifting hook assembly to lift along the vertical direction. The fixed plate is installed on the lower surface of a tower crane installation frame right above the hook component through the connecting column. The lifting rod movably penetrates through the fixing plate along the vertical direction; one end of the lifting rod, which is positioned below the fixed plate, is provided with a lifting block, and the other end of the lifting rod points to the steel wire rope; the lifting block and the fixing plate are provided with return springs. The friction limiting block is arranged on a tower crane mounting frame right above the lifting rod. When the lifting hook assembly is lifted normally, the steel wire rope is positioned between the lifting rod and the friction limiting block; when the hook component is contacted with the fixed plate and then continuously ascends, the upper end of the lifting rod is contacted with the steel wire rope, and the steel wire rope is supported to be contacted with the friction limiting block until the steel wire rope is fixed between the lifting rod and the friction limiting block.

According to the limiting device for the lifting mechanism of the tower crane, the lifting hook assembly is lifted to the highest stroke to be contacted with the lifting block, and the reset spring can effectively buffer the inertia of the lifting hook assembly to improve the protection effect; meanwhile, if the lifting mechanism cannot brake in time, the lifting hook assembly continues to move upwards, the lifting rod and the friction limiting block can firmly clamp the steel wire rope, transmission of the steel wire rope is stopped, the effect of mechanical braking is achieved, roof impact is prevented, the device is protected, and safety is improved.

In one embodiment, one end of the lifting rod above the fixed plate is provided with a limiting wheel for guiding the steel wire rope; the lower surface of the friction limiting block is provided with an anti-slip pad.

In one embodiment, the lower surface of the lifting block is provided with an elastic protection pad.

In one embodiment, the lower surface of the fixing plate is symmetrically provided with buffer grooves along the lifting rod; a buffer block is arranged in the buffer groove in a sliding manner; a buffer spring is arranged between the buffer block and the end wall of the buffer groove; the two ends of the lifting block are hinged with the two buffer blocks through two connecting rods.

In one embodiment, a guide rod movably penetrating through the buffer block is fixedly arranged in the buffer groove, and the guide rod is parallel to the extending direction of the buffer groove.

In one embodiment, the cross section of the buffer groove is T-shaped; the cross section of one end of the buffer block, which is positioned in the buffer groove, is T-shaped; the major diameter of the buffer block at one end in the buffer slot is larger than the minor diameter of the buffer slot and smaller than the major diameter of the buffer slot.

In one embodiment, the lower surfaces of two ends of the T-shaped buffer block are provided with balls in a rolling mode, and the balls are in sliding contact with the buffer grooves.

In one embodiment, a color identifier is arranged on the tower crane mounting frame, and a section of color matched with the color identifier is arranged on the steel wire rope; when the lifting hook assembly is located at the height of being in contact with the fixing plate, the section, provided with the color, of the steel wire rope is opposite to the color identifier.

In one embodiment, a Hall sensing sensor is arranged on the tower crane mounting frame, and a Hall sensing trigger element is arranged on the steel wire rope; when the hook assembly is located at the height of contacting with the fixed plate, the Hall sensing trigger element is opposite to the Hall sensing sensor.

In one embodiment, a pressure display is arranged on the friction limiting block and used for displaying the extrusion force between the lifting rod and the friction limiting block.

Compared with the prior art, the utility model has the following beneficial effects:

Meanwhile, due to the arrangement of the color sensor or the Hall sensor, the braking sensitivity of the lifting mechanism can be effectively improved, multiple guarantees can be provided for braking, and the safety is further improved.

Drawings

Fig. 1 is an overall structure schematic diagram of a limiting device of a tower crane lifting mechanism.

Fig. 2 is a schematic view of a partial structure of a limiting device of a tower crane hoisting mechanism.

Fig. 3 is a structural connection diagram of a fixing plate, a lifting block, a buffer block and a connecting rod in a limiting device of a tower crane lifting mechanism.

Fig. 4 is a sectional view of a buffer slot in a limiting device of a tower crane hoisting mechanism.

Fig. 5 is a layout diagram of color sensors in a limiting device of a lifting mechanism of a tower crane.

In the figure: 1-tower crane mounting rack, 2-color recognizer, 3-steel wire rope, 4-hook component, 5-transmission mechanism, 6-lifting mechanism, 7-connecting column, 8-fixing plate, 9-buffer groove, 10-guide rod, 11-buffer spring, 12-buffer block, 13-connecting rod, 14-lifting rod, 15-limiting wheel, 16-reset spring, 17-lifting block, 18-elastic protection pad, 19-friction limiting block, 20-pressure display and 21-ball.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to fig. 1-5, the embodiment discloses a limiting device for a lifting mechanism of a tower crane, which includes a tower crane mounting frame 1, a lifting mechanism 6, a hook assembly 4, a fixing plate 8, a lifting rod 14 and a friction limiting block 19. The lifting mechanism 6 is arranged at one end of the tower crane mounting frame 1. The lifting hook component 4 is connected with the lifting mechanism 6 through a steel wire rope 3; the lifting mechanism 6 drives the lifting hook assembly 4 to lift in the vertical direction.

The fixed plate 8 is arranged on the lower surface of the tower crane mounting frame 1 right above the hook component 4 through the connecting column 7. In this embodiment, the lower surface of the fixing plate 8 is symmetrically provided with buffer slots 9 along the lifting rod 14; a buffer block 12 is arranged in the buffer groove 9 in a sliding way; a buffer spring 11 is arranged between the buffer block 12 and the end wall of the buffer groove; two ends of the lifting block 17 are hinged with the two buffer blocks 12 through two connecting rods 13. Through setting up dashpot 9, buffer block 12 and buffer spring 11, continue to rise when lifter 14 reaches the safety stroke highest point, lifter 17 makes buffer block 12 slide and compress buffer spring 11 in dashpot 9 through connecting rod 13, cushions through the bounce of spring, reduces the impact force. In this embodiment, a guide rod 10 movably penetrating through the buffer block 12 is fixedly installed in the buffer slot 9, and the guide rod 10 is parallel to the extending direction of the buffer slot 9. The guide rod 10 is arranged to guide and limit the movement of the buffer block 12, so that the stability and the safety are improved.

In other embodiments, the cross section of the buffer groove 9 is "T" shaped; the cross section of one end of the buffer block 12 positioned in the buffer groove 9 is T-shaped; the major diameter of the buffer block 12 at one end of the buffer slot 9 is larger than the minor diameter of the buffer slot 9 and smaller than the major diameter of the buffer slot 9. The buffer block 12 is prevented from slipping out of the buffer groove 9, and safety and stability are improved. Simultaneously, the lower surface roll at buffer block 12 "T" shape both ends can also set up ball 21, and ball 21 and dashpot 9 sliding contact can prevent effectively that buffer block 12 card from dying in dashpot 9.

The lifting rod 14 movably penetrates through the fixing plate 8 along the vertical direction; one end of the lifting rod 14, which is positioned below the fixed plate 8, is provided with a lifting block 17, and the other end points to the steel wire rope 3; when the fixing plate 8 and the lifting rod 14 are continuously lifted, the upper end of the lifting rod 14 abuts against the steel wire rope 3 and jacks up the steel wire rope 3. In this embodiment, one end of the lifting rod 14 above the fixing plate 8 is provided with a limiting wheel 15 for guiding the steel wire rope, and when the lifting rod 14 ascends, the limiting wheel 15 contacts the steel wire rope 3, so that abrasion to the steel wire rope 3 is reduced, and safety is improved. The lifting block 17 and the fixing plate 8 are provided with a return spring 16. In this embodiment, the lower surface of the lifting block 17 is provided with an elastic protection pad 18. When the hook assembly collides against the elevator block 17, the impact on the elevator block 17 can be reduced.

The friction limiting block 19 is arranged on the tower crane mounting frame 1 right above the lifting rod 14. In this embodiment, 19 lower surfaces of friction stopper can also be provided with the slipmat, and when wire rope 3 extrudes between lifter 14 or spacing wheel 15 and friction stopper 19, frictional force is improved, makes wire rope 3's braking effect better. In this embodiment, the friction limiting block 19 may further be provided with a pressure display 20, and the pressure display 20 is used for displaying the extrusion force between the lifting rod 14 and the friction limiting block 19. When the pressure displayed by the pressure display 20 is too high, it is proved that the lifting rod is still rising, and emergency braking is needed manually to prevent the device from being damaged and the hook component from falling off.

In this embodiment, when the hook assembly 4 is lifted normally, the steel wire rope 3 is located between the lifting rod 14 and the friction limiting block 19; when the hook assembly 4 continues to rise after contacting the fixing plate 8, the upper end of the lifting rod 14 contacts the steel wire rope 3, and the steel wire rope 3 is supported to contact the friction limiting block 19 until the steel wire rope 3 is fixed between the lifting rod 14 and the friction limiting block 19.

In the embodiment, the tower crane mounting frame 1 is provided with the color identifier 2, and the steel wire rope 3 is provided with a section of color matched with the color identifier 2; when the hook assembly 4 is positioned at a height where it contacts the fixing plate 8, a section of the wire rope 3 provided with a color is opposite to the color identifier 2. When the section of the steel wire rope 3 with the color reaches the position detected by the color identifier 2, the lifting mechanism is proved to stop working and prevent top rushing when the lifting hook assembly reaches the limit position.

In other embodiments, the tower crane mounting frame 1 can also be provided with a Hall sensing sensor, and the steel wire rope 3 is provided with a Hall sensing trigger element; when the hook component 4 is located at a height contacting with the fixing plate 8, the hall sensing trigger element is opposite to the hall sensing sensor, and an effect of preventing the top-rushing can be achieved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the application of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. The utility model provides a tower machine hoisting mechanism stop device, includes tower machine mounting bracket (1), its characterized in that, stop device still includes:

the lifting mechanism (6) is installed at one end of the tower crane installation frame (1);

the lifting hook component (4) is connected with the lifting mechanism (6) through a steel wire rope (3); the lifting mechanism (6) drives the lifting hook assembly (4) to lift along the vertical direction;

the fixing plate (8) is arranged on the lower surface of the tower crane mounting rack (1) right above the hook component (4) through a connecting column (7);

a lifting rod (14) which movably penetrates through the fixing plate (8) along the vertical direction; one end of the lifting rod (14) positioned below the fixed plate (8) is provided with a lifting block (17), and the other end points to the steel wire rope (3); the lifting block (17) and the fixing plate (8) are provided with a return spring (16); and

the friction limiting block (19) is arranged on the tower crane mounting frame (1) right above the lifting rod (14);

when the hook component (4) is lifted normally, the steel wire rope (3) is positioned between the lifting rod (14) and the friction limiting block (19); when the hook component (4) is contacted with the fixing plate (8) and then continuously ascends, the upper end of the lifting rod (14) is contacted with the steel wire rope (3), and the steel wire rope (3) is propped against the friction limiting block (19) until the steel wire rope (3) is fixed between the lifting rod (14) and the friction limiting block (19).

2. The limiting device of a tower crane hoisting mechanism according to claim 1, wherein one end of the lifting rod (14) above the fixing plate (8) is provided with a limiting wheel (15) for guiding a steel wire rope; and the lower surface of the friction limiting block (19) is provided with an anti-skid pad.

3. The limiting device of a tower crane hoisting mechanism according to claim 1, characterized in that an elastic protective pad (18) is arranged on the lower surface of the lifting block (17).

4. The limiting device of the tower crane hoisting mechanism according to claim 1, wherein the lower surface of the fixing plate (8) is symmetrically provided with buffer grooves (9) along the lifting rod (14); a buffer block (12) is arranged in the buffer groove (9) in a sliding way; a buffer spring (11) is arranged between the buffer block (12) and the end wall of the buffer groove; two ends of the lifting block (17) are hinged with the two buffer blocks (12) through two connecting rods (13).

5. The limiting device for the hoisting mechanism of the tower crane according to claim 4, wherein a guide rod (10) movably penetrating through the buffer block (12) is fixedly installed in the buffer groove (9), and the guide rod (10) is parallel to the extending direction of the buffer groove (9).

6. The limiting device of the tower crane hoisting mechanism according to claim 4, wherein the cross section of the buffer groove (9) is T-shaped; the cross section of one end of the buffer block (12) positioned in the buffer groove (9) is T-shaped; the major diameter of the buffer block (12) at one end in the buffer groove (9) is larger than the minor diameter of the buffer groove (9) and smaller than the major diameter of the buffer groove (9).

7. The limiting device for the hoisting mechanism of the tower crane as claimed in claim 6, wherein the lower surfaces of the two ends of the T-shaped buffer block (12) are provided with rolling balls (21) in a rolling manner, and the rolling balls (21) are in sliding contact with the buffer groove (9).

8. The limiting device for the hoisting mechanism of the tower crane according to claim 1, wherein a color identifier (2) is arranged on the tower crane mounting rack (1), and a section of color matched with the color identifier (2) is arranged on the steel wire rope (3); when the hook component (4) is positioned at the height contacting with the fixing plate (8), the section of the steel wire rope (3) provided with the color is opposite to the color identifier (2).

9. The limiting device for the hoisting mechanism of the tower crane according to claim 1, wherein a Hall sensing sensor is arranged on the tower crane mounting frame (1), and a Hall sensing trigger element is arranged on the steel wire rope (3); when the hook component (4) is positioned at the height of contacting with the fixed plate (8), the Hall sensing trigger element is opposite to the Hall sensing sensor.

10. The limiting device of the tower crane hoisting mechanism according to claim 1, characterized in that a pressure display (20) is arranged on the friction limiting block (19), and the pressure display (20) is used for displaying the extrusion force between the lifting rod (14) and the friction limiting block (19).