Tower crane with carrying device

Abstract

The utility model discloses a tower crane with a carrying device, which comprises a truss, a variable-amplitude trolley is arranged on the truss, a driving unit is arranged outside the truss, four driving wheels are symmetrically arranged on the variable-amplitude trolley, the four driving wheels are symmetrically arranged on the left side and the right side of the variable-amplitude trolley in pairs, a lifting hook is arranged at the lower end of the variable-amplitude trolley, and the carrying device is arranged on the lifting hook. Two auxiliary brake assemblies are symmetrically arranged on the variable-amplitude trolley; the auxiliary brake assemblies are arranged on the two sides of the variable-amplitude trolley and used in cooperation with the driving unit, when the driving unit drives the variable-amplitude trolley to move, the auxiliary brake assemblies do not make contact with the truss, normal operation of the variable-amplitude trolley cannot be affected, and when the driving unit is powered off, the auxiliary brake assemblies are not in contact with the truss. The auxiliary braking assemblies on the two sides of the variable-amplitude trolley make contact with the truss, physical braking is carried out in a friction force increasing mode, and then active braking is carried out on the variable-amplitude trolley; and compared with passive braking of a traditional driving wheel, the sliding distance can be shortened, and the positioning precision is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to building equipment technical field especially, relates to a tower crane with carrying device. BACKGROUND

[0002] With the continuous promotion of the mechanization level of building construction, the tower crane as the core hoisting equipment in the field of building engineering, the performance of its luffing mechanism directly affects the construction efficiency and safety, the current mainstream tower crane luffing system generally adopts the steel rope winch driving mode, and the reciprocating movement of the luffing trolley on the hoisting arm is realized by winding and unwinding the steel wire rope on the drum, this transmission mode has the advantages of simple structure, low cost and the like, but significant technical defects are exposed in actual application.

[0003] In the prior art, the positioning control of the luffing trolley mainly depends on the start-stop operation of the drum motor, when the trolley reaches the target position, the control system only realizes braking by cutting off the power supply of the motor, since the luffing trolley has a large kinetic energy in the running process, the inertia causes it to still produce a sliding displacement after power-off, the actual measurement data shows that the trolley sliding distance can reach 0.5-1.2 meters under full load condition, which seriously affects the construction positioning accuracy, especially in high-rise building construction, this position deviation may cause material hoisting error, and even cause safety accidents.

[0004] Therefore, a tower crane with a carrying device is provided to solve the problems in the prior art. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses the purpose at: in view of the above problems, provide a kind of tower crane with carrying device, the utility model is equipped with auxiliary brake assembly by being set in the luffing trolley both sides, cooperate with the use of drive unit, when drive unit drives luffing trolley to move, auxiliary brake assembly does not contact truss, i.e.

[0006] According to one aspect of the utility model, a tower crane with a carrying device is provided, comprising a truss, a luffing trolley is provided on the truss, a drive unit is provided outside the truss, and the drive unit cooperates with the luffing trolley, four drive wheels are symmetrically provided on the luffing trolley, and the four drive wheels are symmetrically arranged on the left and right sides of the luffing trolley, a lifting hook is provided at the lower end of the luffing trolley, and two auxiliary brake assemblies are symmetrically provided on the luffing trolley.

[0007] Preferably, the auxiliary brake assembly comprises a base plate arranged on the luffing trolley, the base plate is provided with a supporting column, the supporting column is provided with an upper plate close to the middle side of the luffing trolley, the upper plate is provided with a telescopic rod at the lower end, the telescopic rod is provided with a lower plate at the lower end, the lower plate is provided with a roller frame, the roller frame is provided with a brake wheel, the telescopic rod is provided with a limiting spring around the lower end, and the roller frame is provided with a connecting assembly matched with the driving unit.

[0008] Preferably, the connecting assembly comprises a connecting column arranged at the middle of the roller frame, the connecting column is provided with a driving rope at the top, the supporting column is provided with a supporting table at the top, the supporting table is provided with two guide wheels at intervals, the driving rope is arranged on the two guide wheels in sequence, and the driving rope is matched with the driving unit.

[0009] Preferably, the luffing trolley is provided with two guide wheels on the outer side wall in a symmetrical mode, the driving rope is divided into two strands and passes through the two guide wheels respectively, and the other end of the driving rope is connected with the driving unit.

[0010] Preferably, each brake wheel is arranged in a horizontal inclination mode, and the inclination angle of the brake wheel is between 45° and 60°.

[0011] As the above technical scheme is adopted, the advantageous effects of the utility model are as follows:

[0012] The tower crane with the carrying device has the auxiliary brake assembly arranged on the two sides of the luffing trolley, and is matched with the driving unit, so that when the driving unit drives the luffing trolley to move, the auxiliary brake assembly does not contact the truss, and the normal operation of the luffing trolley is not affected, and when the driving unit is powered off, the auxiliary brake assembly on the two sides of the luffing trolley contacts the truss, and physical braking is realized by increasing the friction, so that the luffing trolley is actively stopped; compared with the passive braking of the traditional driving wheel, the sliding distance can be shortened, and the positioning accuracy is significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a perspective view of the utility model;

[0014] Figure 2 is an enlarged view of A of the utility model; Figure 1

[0015] Figure 3 is an enlarged view of B of the utility model; Figure 1

[0016] ​​In the drawings, 1, truss; 2, variable amplitude trolley; 3, drive wheel; 4, lifting hook; 5, base plate; 6, support column; 7, upper plate; 8, telescopic rod; 9, lower plate; 10, roller frame; 11, brake wheel; 12, limiting spring; 13, connecting column; 14, drive rope; 15, support table; 16, guide wheel; 17, guide wheel. DETAILED DESCRIPTION

[0017] To make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the following preferred embodiments are given with reference to the drawings, and the utility model is further explained in detail. However, it should be noted that many details listed in the description are only for the reader to have a thorough understanding of one or more aspects of the utility model, and the aspects of the utility model can be realized even without these specific details.

[0018] Please refer to Figures 1 to 3 The utility model provides a tower crane with carrying device, technical scheme is as follows:

[0019] Including truss 1, be equipped with variable amplitude trolley 2 on the truss 1, the truss 1 is equipped with drive unit outward, and drive unit is composed of reel motor and rope, and drive unit is matched with variable amplitude trolley 2, four drive wheels 3 are symmetrically equipped on variable amplitude trolley 2, and four drive wheels 3 are symmetrically arranged in variable amplitude trolley 2 left and right two sides, lifting hook 4 is equipped at the lower end of variable amplitude trolley 2, two auxiliary brake assemblies are symmetrically equipped on variable amplitude trolley 2.

[0020] The prior art relies on the friction between the four drive wheels 3 and the truss 1 to brake, and materials are placed on the lifting hook 4, and under full load, inertia causes it to still produce sliding displacement after the drive unit is powered off, which seriously affects the construction positioning accuracy. By providing auxiliary brake assemblies on both sides of the variable amplitude trolley 2, the auxiliary brake assemblies are not in contact with the truss 1 when the drive unit moves the variable amplitude trolley 2, i.e. they do not affect the normal operation of the variable amplitude trolley 2. When the drive unit is powered off, the auxiliary brake assemblies on both sides of the variable amplitude trolley 2 come into contact with the truss 1, physically braking by increasing the friction, and thus actively stopping the variable amplitude trolley 2. Compared with the passive braking of the traditional drive wheels 3, the sliding distance can be shortened, and the positioning accuracy can be significantly improved.

[0021] The auxiliary brake assembly includes a base plate 5 disposed on the variable amplitude trolley 2, a support column 6 disposed on the base plate 5, an upper plate 7 disposed on one side of the support column 6 near the middle of the variable amplitude trolley 2, a telescopic rod 8 disposed at the lower end of the upper plate 7, a lower plate 9 disposed at the lower end of the telescopic rod 8, a roller frame 10 disposed on the lower plate 9, a brake wheel 11 disposed on the roller frame 10, a limiting spring 12 disposed around the lower end of the telescopic rod 8, and a connecting assembly disposed on the top of the roller frame 10 and cooperating with the drive unit.

[0022] The driving unit is started, the connecting assembly is driven by the rope, the whole roller frame 10 is driven to move upwards, the telescopic rod 8 and the limiting spring 12 are compressed in the process, so that the roller frame 10 and the brake wheel 11 are separated from the truss 1, and the normal operation of the luffing trolley 2 is ensured; when the luffing trolley 2 moves to the specified position, the driving unit is turned off, and under the action of the limiting spring 12, the roller frame 10 and the brake wheel 11 move downwards and contact the truss 1, physical braking is carried out, and the luffing trolley 2 is actively stopped.

[0023] The connecting assembly comprises a connecting column 13 arranged at the top of the roller frame 10, the top of the connecting column 13 is provided with a driving rope 14, the top of the supporting column 6 is provided with a supporting table 15, two guide wheels 16 are arranged on the supporting table 15 at intervals, the driving rope 14 is arranged on the two guide wheels 16 in sequence, and the driving rope 14 cooperates with the driving unit; two guide wheels 17 are symmetrically arranged on the outer side walls of the luffing trolley 2, the driving rope 14 is divided into two strands and passes through the two guide wheels 17 respectively, and the other end of the driving rope 14 is connected with the driving unit.

[0024] The drum motor of the driving unit is started, the rope is wound, and the other end of the driving rope 14 forms a loop and is arranged on the rope. When the rope is wound, the driving rope 14 is pulled by the driving force during winding, and the driving rope 14 slides under the guidance of the guide wheels 16 and the guide wheels 17, so that the roller frame 10 and the brake wheel 11 are separated from the truss 1, and the luffing trolley 2 normally operates; in the process, the loop and the rope have a certain friction force, and after the rope moves to the limit length of the loop, the loop and the rope form a dynamic balance under the limitation of the roller frame 10 and other parts, so that the driving rope 14 can drive the roller frame 10 to move upwards without affecting the winding of the rope;

[0025] The driving rope 14 is divided into two strands and passes through the two guide wheels 17 respectively, the driving unit can drive the luffing trolley 2 to move back and forth, that is, there are two ropes in two directions, the two driving ropes 14 are connected with the two ropes in different directions respectively, and then the rope moving in each direction can drive the roller frame 10 to separate from the truss 1, so that the stability of the luffing trolley 2 is ensured.

[0026] Each of the brake wheels 11 is arranged horizontally inclined, and the brake wheel 11 is inclined at an angle between 45°-60°; the inclined contact makes the brake wheel 11 and the track of the truss 1 form the transition from line contact to surface contact, increasing the contact area; the inclined angle decomposes the braking force into the normal force perpendicular to the truss 1 and the tangential force parallel to the motion direction, the normal force improves the friction braking efficiency by increasing the normal pressure, and the tangential force can offset the horizontal component force generated by the trolley inertia, and the inclined angle design makes the brake wheel 11 have a rolling trend at the contact moment, so that the brake wheel 11 can have a flexible transition at the initial braking stage, improving the braking force, and also improving the service life of the brake wheel 11.

[0027] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A tower crane having a carrier device, characterized in that Include: Truss (1), the truss (1) is provided with amplitude car (2), the truss (1) is provided with driving unit outside, and driving unit is matched with amplitude car (2), four drive wheels (3) are symmetrically provided on the amplitude car (2), and four drive wheels (3) are symmetrically arranged on the left and right sides of amplitude car (2) two by two, the lower end of amplitude car (2) is provided with lifting hook (4), two auxiliary brake assemblies are symmetrically provided on the amplitude car (2).

2. The tower crane with a carrier device according to claim 1, characterized in that: The auxiliary brake assembly includes the base plate (5) provided on the amplitude car (2), the support column (6) is provided on the base plate (5), the upper plate (7) is provided on the one side of the middle of the amplitude car (2) close to the support column (6), the lower end of the upper plate (7) is provided with telescopic rod (8), and the lower end of the telescopic rod (8) is provided with lower plate (9), the lower plate (9) is provided with roller frame (10), and the brake wheel (11) is provided on the roller frame (10), the lower end of the telescopic rod (8) is provided with the limiting spring (12), the top of the roller frame (10) is provided with the connecting assembly matched with the driving unit.

3. The tower crane with a carrier device according to claim 2, characterized in that: The connecting assembly includes the connecting column (13) provided on the top of the roller frame (10) in the middle, the driving rope (14) is provided on the top of the connecting column (13), the support column (6) is provided with support table (15), and two guide wheels (16) are provided on the support table (15) at intervals, the driving rope (14) is wound on the two guide wheels (16) in sequence, and the driving rope (14) is matched with the driving unit.

4. The tower crane with a carrier device according to claim 3, characterized in that: The outer side wall of the amplitude car (2) is symmetrically provided with two guide wheels (17), the driving rope (14) is divided into two strands and passes through two guide wheels (17) respectively, and the other end of the driving rope (14) is connected with the driving unit.

5. The tower crane with a carrier device according to claim 2, characterized in that: Each brake wheel (11) is horizontally inclined, and the inclination angle of brake wheel (11) is between 45°-60°.

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