Safety braking device for closed-loop tower crane lifting machine

Abstract

The utility model discloses a safety braking device for a closed-loop type tower crane lifting machine, which comprises a rack, a lifting winding drum (1), a rotating shaft (2) and a lifting motor (3), and two end parts of the lifting winding drum (1) are sleeved with blocking pieces (4); a plurality of braking pieces (5) are arranged on the side face, away from the other blocking piece (4), of each blocking piece (4), and each braking piece (5) is connected with a pushing air cylinder (6); a plurality of brake grooves (7) are formed in the outer surface of the rotating shaft (2), and the brake grooves (7) are matched with the brake pieces (5); an auxiliary braking device is arranged on the rack and corresponds to the position, close to the lower portion of the end of the lifting motor (3), of the rotating shaft (2), and a ratchet wheel (8) matched with the auxiliary braking device is arranged on the rotating shaft (2). The brake device not only can improve the brake safety, but also has the advantages of being high in brake efficiency, simple in structure, high in use stability and convenient to overhaul.

Description

Technical Field

[0001] The utility model relates to a braking device, in particular to a safety braking device for a closed-loop tower crane hoist. Background Art

[0002] The hoist is an important structure on the tower crane to realize the up and down movement of heavy objects. In order to avoid accidents, the hoist of the tower crane is generally equipped with a brake device for emergency braking. At present, the common brake devices used in the hoist mostly use electromagnetic brakes to directly brake the motor. However, in actual use, this braking method will produce a large impact force, and under multiple large impact forces, it will easily damage the brake, resulting in the problem of brake failure, affecting the safety of the entire braking work. Therefore, the existing brake device for tower crane hoists has the problem of poor braking safety. Utility Model Content

[0003] The purpose of the utility model is to provide a closed-loop safety brake device for a tower crane hoist. The utility model has the advantage of high braking safety.

[0004] The technical solution of the utility model is as follows: a safety brake device for a closed-loop tower crane hoist comprises a frame, a hoisting drum, a rotating shaft and a hoisting motor connected to the rotating shaft, both ends of the hoisting drum are sleeved with stoppers, and the bottom end of each stopper is fixedly mounted on the frame; a plurality of annular evenly distributed brake members are arranged on the side of each stopper away from another stopper, and each brake member is connected to a pushing cylinder for pushing the brake member to move in the direction of the rotating shaft; a plurality of annular evenly distributed brake grooves are arranged on the outer surface of the rotating shaft, and the brake grooves cooperate with the brake members; an auxiliary brake device is arranged on the frame at a position close to the end of the hoisting motor on the corresponding rotating shaft, and a ratchet wheel cooperating with the auxiliary brake device is arranged on the rotating shaft; The baffle can be used to adjust the winding position of the lifting drum to ensure the winding effect; and the baffle can also serve as a mounting seat for the brake and the pushing cylinder, so there is no need to set up an additional mounting device, which simplifies the overall structure; the brake and the pushing cylinder are used, so when it is necessary to brake the rotation of the lifting drum, it is only necessary to drive the brake to move in the direction of the rotating shaft through the pushing cylinder, so that the brake and the brake groove cooperate and engage with each other to block the rotation of the rotating shaft, and the braking work at both ends can speed up the braking effect on the rotating shaft and the lifting drum, while improving the braking rate. When one group or one of the pushing cylinders fails, the others can also replace it to perform normal work, ensuring the safety of braking.

[0005] In the aforementioned closed-loop tower crane hoist safety brake device, a cavity is provided inside the brake component, in which a first magnetic block is installed; a second magnetic block that cooperates with the first magnetic block is bonded to the inner side wall of the brake groove; the first magnetic block in the brake component cooperates with the second magnetic block arranged on the inner side wall of the brake groove, so that the brake component can be more stably attracted together after entering the brake groove, avoiding the phenomenon of falling, thereby ensuring the braking effect.

[0006] In the aforementioned closed-loop tower crane hoist safety brake device, limit strips are provided on the baffle at positions corresponding to both sides of the brake member, and a smooth coating is coated on the side of each limit strip close to another limit strip; the limit strips can be used to guide and limit the movement of the brake member to ensure that the brake member can move stably toward the brake groove, thereby ensuring the stability of the braking.

[0007] In the aforementioned closed-loop tower crane hoist safety brake device, the auxiliary brake device includes a mounting seat arranged on the frame, on which a brake cylinder is arranged; the brake cylinder is connected to a brake movable seat, on which a ratchet pawl for braking the ratchet is arranged.

[0008] In the aforementioned closed-loop tower crane hoist safety brake device, the ratchet is composed of two left and right ratchet assemblies, and an arc-shaped positioning seat is provided on the side of each ratchet assembly; a plurality of positioning holes are provided on the positioning seat, and each positioning hole is provided with a fixing member connected to the rotating shaft; the entire ratchet is configured to be composed of two left and right ratchet assemblies, and the two ratchet assemblies are installed on the rotating shaft through the fixing members and the positioning holes, so that the entire ratchet can be removed from the rotating shaft, which is convenient for maintenance.

[0009] In the aforementioned closed-loop tower crane hoist safety brake device, a speed reducer is provided between the hoisting motor and the rotating shaft.

[0010] Compared with the prior art, the utility model improves the existing brake device for tower cranes. In the utility model, two symmetrically distributed baffles are provided on the hoisting drum, and the baffles can be used to adjust the reeling position of the hoisting drum to ensure the reeling effect; and the baffles can also serve as mounting seats for the brakes and the pushing cylinder, so that there is no need to set up additional mounting devices, which simplifies the overall structure; a plurality of evenly distributed annular brakes are provided on the baffles, and each brake is connected to a pushing cylinder. When the rotation of the hoisting drum needs to be adjusted, the brakes can be adjusted to ensure the reeling effect; and the baffles can also serve as mounting seats for the brakes and the pushing cylinder, so that there is no need to set up additional mounting devices, which simplifies the overall structure; and a plurality of evenly distributed annular brakes are provided on the baffles, and each brake is connected to a pushing cylinder. When braking, it is only necessary to drive the brake part to move toward the rotating shaft by pushing the cylinder, so that the brake part and the brake groove cooperate and engage with each other to stop the rotation of the rotating shaft. The braking work at both ends can speed up the braking effect of the rotating shaft and the lifting drum, and improve the braking rate; and the setting of two groups of brake parts can ensure that when one group or one of the pushing cylinders fails, the other can still replace it to perform normal work, ensuring the safety of braking; at the same time, the ratchet and auxiliary braking device arranged on the rotating shaft can assist in braking work, further improving the safety of braking. In addition, the utility model also provides a first magnetic block in the brake part, which cooperates with the second magnetic block provided on the inner wall of the brake groove, so that the brake part can be more stably attracted together after entering the brake groove, avoiding the phenomenon of falling, thereby ensuring the braking effect; by providing two symmetrically distributed limit bars on the stopper, the limit bars can be used to guide and limit the movement of the brake part, so as to ensure that the brake part can stably move toward the brake groove, thereby ensuring the stability of the brake; by arranging the entire ratchet to be composed of a left and right ratchet assembly, and both parts of the ratchet assembly are installed on the rotating shaft through a fixing member and a positioning hole, so that the entire ratchet can be disassembled from the rotating shaft, which is convenient for maintenance; by providing a reducer, it is possible to avoid damage to the lifting motor caused by sudden deceleration of the rotating shaft, thereby extending the service life. Therefore, the utility model can not only improve the safety of braking, but also has the advantages of high braking efficiency, simple structure, high stability in use and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 It is a side view of the utility model;

[0013] Figure 3 It is a schematic diagram of the structure of the ratchet and the pawl;

[0014] Figure 4 It is a structural diagram of the brake member and the brake groove when they cooperate.

[0015] The markings in the attached drawings are: 1-lifting drum, 2-rotating shaft, 3-lifting motor, 4-block, 5-brake, 6-pushing cylinder, 7-brake groove, 8-ratchet, 9-first magnetic block, 10-second magnetic block, 11-limiting strip, 12-brake cylinder, 13-pawl, 14-reducer. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0017] Embodiment. A closed-loop tower crane hoist safety brake device is constructed as follows: Figures 1 to 4 As shown, it includes a frame, a lifting drum 1, a rotating shaft 2 and a lifting motor 3 connected to the rotating shaft 2, both ends of the lifting drum 1 are sleeved with baffles 4, and the bottom end of each baffle 4 is fixedly mounted on the frame; a plurality of annular evenly distributed brake members 5 are arranged on the side of each baffle 4 away from another baffle 4, and each brake member 5 is connected to a pushing cylinder 6 for pushing the brake member 5 to move toward the rotating shaft 2; a plurality of annular evenly distributed brake grooves 7 are arranged on the outer surface of the rotating shaft 2, and the brake grooves 7 cooperate with the brake members 5; an auxiliary braking device is arranged on the frame at a position corresponding to the rotating shaft 2 just below the end of the lifting motor 3, and a ratchet 8 cooperating with the auxiliary braking device is arranged on the rotating shaft 2.

[0018] The brake member 5 is provided with a cavity in which a first magnetic block 9 is installed; a second magnetic block 10 cooperating with the first magnetic block 9 is bonded to the inner side wall of the brake groove 7; limit strips 11 are provided at positions on the stopper 4 corresponding to the two sides of the brake member 5, and a smooth coating is coated on the side of each limit strip 11 close to another limit strip 11; the auxiliary braking device includes a mounting seat arranged on the frame, and a brake cylinder 12 is arranged on the mounting seat; the brake cylinder 12 is connected to a brake moving seat, and a ratchet 13 for braking the ratchet 8 is arranged on the brake moving seat; the ratchet 8 is spliced ​​by left and right ratchet assemblies, and an arc-shaped positioning seat is arranged on the side of each ratchet assembly; a plurality of positioning holes are provided on the positioning seat, and each positioning hole is provided with a fixing member connected to the rotating shaft 2; a reducer 14 is arranged between the lifting motor 3 and the rotating shaft 2.

[0019] Working principle: When performing the braking work, first control the reducer 14 to start, so as to slow down the rotation speed of the lifting motor 3 and realize the first level of deceleration work on the rotating shaft 2; secondly control the push cylinder 6 to start, and after the push cylinder 6 is started, it will drive the brake member 5 to move in the direction of the rotating shaft 2, so that the brake member 5 moves to the brake groove 7; during the movement of the brake member 5, the limit bar 11 can guide and limit the movement of the brake member 5 to avoid deviation in its movement, thereby ensuring the stability of subsequent braking; when the brake member 5 is installed in the brake groove 7, the first magnetic block 9 on the brake member 5 will generate attraction with the second magnetic block 10 in the brake groove 7, which in turn enables each brake member 5 to be stably connected with the brake groove 7 The inner walls of the brake 5 are fitted together, and the position of the brake member 5 is a fixed member, so that the rotating shaft 2 can be braked; because there are two baffles 4, the rotating shaft 2 can be braked synchronously from both ends of the rotating shaft 2, while ensuring the effectiveness of the brake, the impact force of the brake can also be reduced, thereby reducing the damage to the rotating shaft 2, the lifting motor 3, the pushing cylinder 6 and the brake member 5, ensuring the safety of the brake and extending the service life; when it is necessary to further accelerate the braking effect, the brake cylinder 12 is controlled to start, and after the brake cylinder 12 is started, the pawl 13 will be driven to move toward the ratchet 8 on the rotating shaft 2. The pawl 13 and the ratchet 8 cooperate with each other to further brake the rotation of the rotating shaft 2, thereby improving the braking effect.

Claims

1. A safety brake device for a closed-loop tower crane hoist, comprising a frame, a hoisting drum (1), a rotating shaft (2), and a hoisting motor (3) connected to the rotating shaft (2), characterized in that: Both ends of the lifting drum (1) are sleeved with a stopper (4), and the bottom end of each stopper (4) is fixedly mounted on the frame; a plurality of annular evenly distributed brake members (5) are provided on the side of each stopper (4) away from the other stopper (4), and each brake member (5) is connected to a pushing cylinder (6) for pushing the brake member (5) to move toward the rotating shaft (2); a plurality of annular evenly distributed brake grooves (7) are provided on the outer surface of the rotating shaft (2), and the brake grooves (7) are matched with the brake members (5); an auxiliary braking device is provided on the frame at a position directly below the end of the corresponding rotating shaft (2) close to the lifting motor (3), and a ratchet (8) matched with the auxiliary braking device is provided on the rotating shaft (2).

2. The closed-loop tower crane hoist safety brake device according to claim 1, characterized in that: The brake member (5) is provided with a cavity in which a first magnetic block (9) is installed; and a second magnetic block (10) that cooperates with the first magnetic block (9) is bonded to the inner side wall of the brake groove (7).

3. The closed-loop tower crane hoist safety brake device according to claim 1, characterized in that: Limiting strips (11) are provided on the stopper (4) at positions corresponding to both sides of the braking member (5), and a smooth coating is applied on the side of each limiting strip (11) close to another limiting strip (11).

4. The closed-loop tower crane hoist safety brake device according to claim 1, characterized in that: The auxiliary braking device comprises a mounting seat arranged on a frame, on which a brake cylinder (12) is arranged; the brake cylinder (12) is connected to a brake movable seat, on which a ratchet (13) for braking a ratchet wheel (8) is arranged.

5. The closed-loop tower crane hoist safety brake device according to claim 1, characterized in that: The ratchet (8) is formed by splicing two left and right ratchet components, and a circular arc-shaped positioning seat is provided on the side surface of each ratchet component; a plurality of positioning holes are provided on the positioning seat, and each positioning hole is provided with a fixing piece connected to the rotating shaft (2).

6. The closed-loop tower crane hoist safety brake device according to any one of claims 1 to 5, characterized in that: A speed reducer (14) is provided between the lifting motor (3) and the rotating shaft (2).

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