Tower crane movable arm structure

Abstract

The movable arm structure of the tower crane comprises a tower body, a base station is rotationally arranged on the tower body; a control room is arranged on the base; a hoisting movable arm is rotationally arranged on one side of the base table; a supporting rod is arranged on the base; a first pull rod is connected between the supporting rod and the hoisting movable arm; a second pull rod is connected between the supporting rod and the base station; a movable arm balancing device is arranged on the lower side of the abutment; the movable arm balancing device comprises a balancing frame fixedly arranged on the lower side of the base table. A sliding groove is formed in one side of the balance frame. A balance weight module is arranged in the sliding groove in a sliding mode. A fixing sleeve is arranged on the outer side of the counterweight module; a worm gear is rotationally arranged on the lower side of the balancing frame relative to the fixing sleeve; a threaded rod is fixedly arranged on one side of the fixing sleeve and penetrates through the worm wheel. The worm gear is in threaded connection with the threaded rod; the balancing frame is provided with a motor on one side of the worm gear; a rotating shaft of the motor is connected with a worm; and the worm and the worm gear are in meshed connection.

Description

Technical Field

[0001] This utility model belongs to the field of construction engineering equipment, and in particular relates to a tower crane boom structure. Background Technology

[0002] A luffing jib tower crane, also known as a luffing tower crane, is a type of lifting equipment with a variable jib that can slew up and down. It is widely used in construction sites such as high-rise buildings, bridges, and large industrial facilities. Through the pitching and swaying of the jib, it achieves a wide range of luffing angles to flexibly adjust the working radius. Compared to common fixed horizontal tower cranes, it is more suitable for densely packed high-rise buildings or construction sites with limited space. When lifting heavy equipment, the weight of the equipment can cause the tower crane to overturn. Therefore, a counterweight must be placed along the extension of the jib to balance the overturning force. The required counterweight weight and distance vary depending on the luffing motion or the weight of the equipment being lifted. Currently used tower crane jib counterweight balancing devices are difficult to move, often involving adding or removing counterweights or using simple hydraulic systems to control counterweight movement. These methods have poor stability and are difficult to adjust in time to accommodate jib changes, resulting in poor maintenance of the tower crane's balance. Utility Model Content

[0003] The purpose of this utility model is to provide a tower crane boom structure to solve the technical problem that the commonly used tower crane boom counterweight balancing devices are difficult to move. They mostly involve increasing or decreasing the number of counterweights or using a simple hydraulic system to control the movement of the counterweights, which has poor stability and is difficult to adjust the distance in time to match the boom luffing, resulting in poor maintenance of tower crane balance.

[0004] To achieve the above objectives, the specific technical solution of this utility model for a tower crane boom structure is as follows:

[0005] A tower crane boom structure includes a tower body; a base is rotatably mounted on the tower body; a control room is mounted on the base; a lifting boom is rotatably mounted on one side of the base; a support rod is mounted on the base; a first tie rod is connected between the support rod and the lifting boom; a second tie rod is connected between the support rod and the base; a boom balancing device is mounted on the lower side of the base; the boom balancing device includes a balancing frame fixedly mounted on the lower side of the base; a sliding groove is provided on one side of the balancing frame; a counterweight module is slidably mounted in the sliding groove; a fixing sleeve is provided on the outer side of the counterweight module; a worm gear is rotatably mounted on the lower side of the balancing frame relative to the fixing sleeve; a threaded rod is fixedly mounted on one side of the fixing sleeve, passing through the worm gear; the worm gear and the threaded rod are connected by a thread; a motor is mounted on one side of the worm gear on the balancing frame; a worm is connected to the motor shaft; the worm and the worm gear are meshed together.

[0006] Furthermore, the counterweight module consists of multiple counterweight blocks.

[0007] Furthermore, guide rods are arranged opposite each other within the chute; the counterweight module is slidably mounted on the guide rods.

[0008] Furthermore, multiple cylinders are arranged opposite each other on both sides of the slide groove; clamping plates are connected to the cylinder heads of multiple adjacent cylinders.

[0009] Furthermore, a guide sleeve is fixedly installed on the side of the worm gear away from the counterweight module; the threaded rod is slidably installed inside the guide sleeve.

[0010] This utility model discloses a tower crane boom structure with the following advantages: A boom balancing device is installed on the lower side of the base to provide counterweight balance for the boom. When the boom is luffing or lifting equipment of different weights, the motor and worm drive the worm wheel to rotate, which in turn drives the threaded rod and fixed sleeve to slide the counterweight module in a groove on the balance frame. This adjusts the distance between the counterweight module and the boom, changing the position of the counterweight module to achieve counterweight torque balance and maintain the stability of the tower crane. The adjustment efficiency is high, and it can be coordinated with the movement of the boom for dynamic torque balancing. The positioning accuracy is high, and the reverse self-locking characteristic of the worm gear transmission can be used to prevent the counterweight module from accidentally sliding when the power is off or the motor stops. Guide rods are arranged opposite each other in the groove, and the counterweight module is slidably mounted on the guide rods. The counterweight module is guided and constrained by guide rods to prevent it from shifting, twisting, or getting stuck during movement. This ensures smooth sliding of the counterweight module and prevents lateral swaying, improving its anti-yaw capability and ensuring the stability of the motor-driven counterweight module's movement within the slide. Multiple cylinders are positioned opposite each other on both sides of the slide, with clamping plates connected to their cylinder heads. When the motor-driven counterweight module slides within the slide, the cylinder heads retract, disengaging the clamping plates from the counterweight module. When the counterweight module reaches the desired position, the cylinders are activated, pushing the clamping plates to clamp and fix the counterweight module, thus limiting its movement and preventing accidental sliding within the slide, improving safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0012] Figure 2 This utility model Figure 1 Enlarged view of region A in the middle;

[0013] Figure 3 This is a schematic diagram of the boom balancing device of this utility model;

[0014] Figure 4 This utility model Figure 3 Enlarged view of region B in the middle;

[0015] Figure 5 This utility model Figure 3 Enlarged diagram of region C in the middle;

[0016] The markings in the diagram are as follows: 1. Tower body; 2. Base; 3. Control room; 4. Lifting boom; 5. Support rod; 6. First tie rod; 7. Second tie rod; 8. Boom balancing device; 9. Balance frame; 10. Slide groove; 11. Counterweight module; 12. Fixed sleeve; 13. Worm gear; 14. Threaded rod; 15. Motor; 16. Worm; 17. Counterweight block; 18. Guide rod; 19. Cylinder; 20. Clamping plate; 21. Guide sleeve. Detailed Implementation

[0017] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a tower crane boom structure according to this utility model.

[0018] like Figures 1-5 As shown, this utility model discloses a tower crane boom structure, including a tower body 1; a base 2 rotatably mounted on the tower body 1; a control room 3 mounted on the base 2; a lifting boom 4 rotatably mounted on one side of the base 2; a support rod 5 mounted on the base 2; a first tie rod 6 connecting the support rod 5 and the lifting boom 4; a second tie rod 7 connecting the support rod 5 and the base 2; a boom balancing device 8 mounted on the lower side of the base 2; the boom balancing device 8 includes a balancing frame 9 fixedly mounted on the lower side of the base 2; and a sliding groove 10 mounted on one side of the balancing frame 9. A counterweight module 11 is slidably arranged in the slide groove 10; the counterweight module 11 is composed of multiple counterweight blocks 17; a fixing sleeve 12 is arranged on the outside of the counterweight module 11; a worm gear 13 is rotatably arranged on the lower side of the balance frame 9 relative to the fixing sleeve 12; a threaded rod 14 is fixedly arranged on one side of the fixing sleeve 12, passing through the worm gear 13; the worm gear 13 and the threaded rod 14 are connected by threads; a motor 15 is arranged on one side of the balance frame 9 at the worm gear 13; a worm 16 is connected to the shaft of the motor 15; the worm 16 and the worm gear 13 are meshed.

[0019] Combination Figures 1-5As shown, during use, when the boom is luffing or lifting equipment of different weights, and it is necessary to change the position of the counterweight module to adjust the counterweight torque, the motor 15 is started. The shaft of the motor 15 drives the worm gear 16 to rotate, which in turn drives the worm wheel 13 to rotate. Through the threaded connection between the worm wheel 13 and the threaded rod 14, the threaded rod 14 and the fixed sleeve 12 are moved horizontally. The fixed sleeve 12 drives the counterweight module 11 to slide in the groove 10 on the balance frame 9, adjusting the distance between the counterweight module 11 and the boom 4, changing the position of the counterweight module 11 to achieve the balance of the counterweight torque, maintaining the stability of the tower crane. The adjustment efficiency is high, and it can be coordinated with the movement of the boom 4 to achieve dynamic torque balance. The positioning accuracy is high, and the reverse self-locking characteristic of the worm wheel 13 and worm gear 16 transmission can be used to prevent the counterweight module 11 from sliding accidentally when the power is off or the motor 15 stops.

[0020] Guide rods 18 are arranged opposite each other inside the slide 10; the counterweight module 11 is slidably arranged on the guide rods 18. The guide rods 18 guide and constrain the counterweight module 11 to prevent it from shifting, twisting, or getting stuck during movement. This ensures that the counterweight module 11 slides smoothly during movement and also prevents it from swaying laterally, improving its anti-yaw capability and ensuring the stability of the motor 15 driving the counterweight module 11 to move and run within the slide 10.

[0021] Multiple cylinders 19 are arranged opposite each other on both sides of the slide groove 10; clamping plates 20 are connected to the cylinder heads of multiple adjacent cylinders 19. When the motor 15 drives the counterweight module 11 to slide in the slide groove 10, the cylinder heads of multiple cylinders 19 retract, causing the clamping plates 20 to disengage from the counterweight module. When the counterweight module moves to a suitable position, multiple cylinders 19 are activated, and the multiple cylinders 19 on both sides of the counterweight module push the clamping plates 20 to clamp and fix the counterweight module, forming a limit on the counterweight module, preventing the counterweight module from sliding accidentally in the slide groove 10, and improving safety performance.

[0022] A guide sleeve 21 is fixedly installed on the side of the worm gear 13 away from the counterweight module 11. The threaded rod 14 is slidably installed in the guide sleeve 21. When the motor 15 drives the threaded rod 14, the fixed sleeve 12, and the counterweight module 11 to move through the worm gear 13 and worm 16, the end of the threaded rod 14 away from the fixed sleeve 12 slides synchronously in the guide sleeve 21. The guide sleeve 21 limits and constrains the movement of the threaded rod on the turntable, ensuring that the threaded rod will not deviate or get stuck, assisting the threaded rod to move smoothly, and preventing vibration caused by the motor 15.

[0023] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A tower crane boom structure, characterized in that, The structure includes a tower body (1); a base (2) is rotatably mounted on the tower body (1); a control room (3) is mounted on the base (2); a lifting boom (4) is rotatably mounted on one side of the base (2); a support rod (5) is mounted on the base (2); a first tie rod (6) is connected between the support rod (5) and the lifting boom (4); a second tie rod (7) is connected between the support rod (5) and the base (2); a boom balancing device (8) is mounted on the lower side of the base (2); the boom balancing device (8) includes a balancing frame (9) fixedly mounted on the lower side of the base (2); a sliding groove is mounted on one side of the balancing frame (9). 10); A counterweight module (11) is slidably arranged in the groove (10); A fixed sleeve (12) is arranged on the outside of the counterweight module (11); A worm wheel (13) is rotatably arranged on the lower side of the balance frame (9) relative to the fixed sleeve (12); A threaded rod (14) is fixedly arranged on one side of the fixed sleeve (12) and passes through the worm wheel (13); The worm wheel (13) and the threaded rod (14) are connected by threads; A motor (15) is arranged on one side of the balance frame (9) on the worm wheel (13); A worm (16) is connected to the shaft of the motor (15); The worm (16) and the worm wheel (13) are connected by meshing.

2. The tower crane boom structure according to claim 1, characterized in that, The counterweight module (11) consists of multiple counterweight blocks (17).

3. A tower crane boom structure according to claim 1, characterized in that, Guide rods (18) are arranged opposite each other in the groove (10); the counterweight module (11) is slidably arranged on the guide rods (18).

4. A tower crane boom structure according to claim 1, characterized in that, Multiple cylinders (19) are arranged opposite each other on both sides of the slide groove (10); clamping plates (20) are connected to the cylinder heads of multiple adjacent cylinders (19).

5. A tower crane boom structure according to claim 1, characterized in that, The balance frame (9) has a guide sleeve (21) fixedly installed on the side of the worm gear (13) away from the counterweight module (11); the threaded rod (14) is slidably installed in the guide sleeve (21).

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