A torque-free tower crane
The torque-free tower crane addresses torque-induced tilting and fatigue by using a compensating arm and blower system to dynamically balance loads, improving stability and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-03-19
AI Technical Summary
Existing tower cranes suffer from torque-induced tilting and metal fatigue due to fixed counterweights and boom configurations, leading to reduced load-bearing capacity and structural damage.
A torque-free tower crane design incorporating a compensating arm, lever signal detection rod, pressure sensors, and a blower system to dynamically balance torque and stabilize the crane, using winches and sliding wheels for efficient load distribution and rotation.
Enhances crane stability, load-bearing capacity, and reduces structural damage by compensating for torque imbalances, ensuring safe and efficient operation with reduced maintenance costs.
Smart Images
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Abstract
Description
Technical field
[0001] The present utility model relates to the technical field of cranes, specifically to a torque-free tower crane. State of the art
[0002] In existing cranes, the counterweight is a fixed weight, and the boom is also fixed to lift a weight a considerable distance. This creates an empty load or a light load, causing the tower to tilt towards the counterweight side. The load-bearing capacity decreases linearly with the load, and the tower also tilts towards the crane boom, generating a torque. This leads to metal fatigue and a shortened service life.
[0003] In existing tower cranes, the rotation of the boom depends on a slewing gear mounted on the tower body; a stationary gear ring rotates to drive the boom into rotation. Consequently, torque is simultaneously transmitted to the tower body, causing it to twist and resulting in damage.
[0004] Therefore, a torque-free tower crane has become an urgent problem for people to solve. Disclosure of the utility model
[0005] The technical problem to be solved by the present utility model is to provide a torque-free tower crane in order to enable the compensation of torque during the crane's operation, thereby increasing the crane's stability, safety and load-bearing capacity.
[0006] To solve the aforementioned technical problem, the present utility model provides the technical solution: a torque-free tower crane comprising a tower body, a crane boom, and a compensating arm; a head section of the tower body is connected to a front section of the crane boom by a crane traction arm, and the head section of the tower body is connected to a rear section of the compensating arm by a compensating traction arm; A lever signal detection rod is provided in the middle of the head part of the tower body; a first pressure sensor and a second pressure sensor are provided on both sides of a lower end of the lever signal detection rod; A counterweight is provided on the balancing arm, and a movement hook and a blower are provided on the crane boom.
[0007] Furthermore, a crane winch is provided on the compensating arm, which is connected to the counterweight and pulls it along the compensating arm for movement.
[0008] Furthermore, a second winch is provided above the compensating arm, a first sliding wheel is provided on the tower body, a second sliding wheel is provided on the crane boom, a pull rope of the second winch is connected to the movement hook after being wound around a head part of the first sliding wheel and a lower part of the second sliding wheel.
[0009] Furthermore, the crane pull arm includes an end pull rod through which the head of the tower body is connected to an end part of the crane boom, and an auxiliary pull rod through which the head of the tower body is connected to the front part of the crane boom.
[0010] The advantage of the present utility model over the existing technology is as follows: 1. In the present utility model, the empty and heavy load situations of the crane are checked by the fitting of the lever signal detection rod and the pressure sensors on both sides, thus the position is regulated by controlling the counterweight, enabling the protection of the tower body and the increase in load-bearing capacity.
[0011] In the present utility model, the counterforce of the blower against the air enables the rotation of the crane boom without affecting the crane boom or the tower body; by driving with the blower, a soft start is possible, no impact occurs, the structure is simple; the costs of using and maintaining the crane are reduced. Explanation of the illustrations
[0012] Fig. is a structural diagram of a torque-free tower crane of the present utility model.
[0013] As shown in the figure: (1) Tower body; (2) Crane boom; (3) Compensating arm; (4) Crane pull arm; (5) Compensating pull arm; (6) Lever signal detection rod; (7) First pressure sensor; (8) Second pressure sensor; (9) Movement counterweight; (10) Movement hook; (11) Blower; (12) Crane winch; (13) Second winch; (14) First slide wheel; (15) Second slide wheel; (16) Pull rope; (17) End pull rod; (18) Auxiliary pull rod. Designs
[0014] The following section, in conjunction with the illustration, explains in more detail a torque-free tower crane of the present utility model.
[0015] Combined with Fig. The present utility model is shown in detail.
[0016] A torque-free tower crane comprising a tower body (1), a crane boom (2), and a compensating arm (3); the top section of the tower body (1) is connected to the front section of the crane boom (2) by a crane pull arm (4), and the top section of the tower body (1) is also connected to the rear section of the compensating arm (3) by a compensating pull arm (5). This connection ensures that, when the crane boom (2) and the compensating arm (3) are subjected to a force load, an effective compensation of the torque is achieved, thereby reducing the generation of torque.
[0017] Furthermore, a lever signal detection rod (6) is provided at the center of the top section of the tower body (1). A first pressure sensor (7) and a second pressure sensor (8) are provided on each side of the lower end of the lever signal detection rod (6). These two sensors allow the force load on the top section of the tower body (1) to be monitored in real time, thus determining whether the crane is in a state of torque equilibrium. If a torque imbalance is detected, a control measure can be taken immediately to ensure the safe operation of the crane.
[0018] Furthermore, a counterweight (9) is provided on the compensating arm (3). By adjusting the position of the counterweight, the torque generated by the crane boom (2) can be further balanced. Simultaneously, a movement hook (10) and a blower (11) are provided on the crane boom (2). The blower (11) can blow air and, by means of a counterforce from the air, enable the rotation of the crane boom (2) to achieve the goal of boom adjustment.
[0019] As a further improvement to the present utility model, a crane winch (12) is provided on the compensating arm (3), which is connected to the counterweight (9) and pulls it to move along the compensating arm (3). The crane winch (12) can thus be controlled by the first pressure sensor (7) and the second pressure sensor (8) to facilitate control of the position of the counterweight (9) and to enable a dynamic balance of torque; depending on actual requirements, the crane winch (12) can also be replaced by a hydraulic pulling device or another device with a lifting and pulling function.
[0020] Furthermore, a second winch (13) is provided above the compensating arm (3), a first sliding wheel (14) is provided on the tower body (1), and a second sliding wheel (15) is provided on the crane boom (2). A traction cable (16) of the second winch (13) is wound around a head portion of the first sliding wheel (14) and a lower portion of the second sliding wheel (15) and connected to the movement hook (10). This design allows the pulling force of the traction cable (16) to be transmitted more effectively to the movement hook (10), while simultaneously reducing friction and loss, and increasing lifting efficiency.
[0021] Furthermore, the crane drawbar (4) comprises an end drawbar (17) through which the head of the tower body (1) is connected to an end section of the crane boom (2), and an auxiliary drawbar (18) through which the head of the tower body (1) is connected to the front section of the crane boom (2). This design increases the connection strength between the crane boom (2) and the tower body (1), making the crane boom (2) more stable under load. The crane drawbar (4) not only functions as a drawbar but also as a weighing or weight transfer mechanism.
[0022] The specific implementation process of the torque-free tower crane of the present utility model is as follows: Combined with Fig., the counterweight (9) moves towards an O-point on a central part of the tower body (1) when the crane is under empty or light load, the lever signal detection rod (6) is located between the first pressure sensor (7) (E2) and the second pressure sensor (8) (E1), and the tower body (1) does not tilt.
[0023] When a relatively large weight is lifted or lifted a relatively long distance, the lever signal detection rod (6) sends a trigger signal to the first pressure sensor (7) (E2), the counterweight (9) moves towards an end part A of the balancing arm (3), the lever signal detection rod (6) returns between the first pressure sensor (7) (E2) and the second pressure sensor (8) (E1), the turret body (1) does not tilt, thus achieving the function of protecting the turret body (1) and increasing the load-bearing capacity.
[0024] The counterforce of the blower (11) against the air enables the rotation of the crane boom (2) without affecting the crane boom (2) and the tower body (1); by driving with the blower (11) a soft start is possible, no impact occurs, the structure is simple; the costs of using and maintaining the crane are reduced.
Claims
[1] A torque-free tower crane, characterized by , that it comprises a tower body (1), a crane boom (2) and a compensating arm (3); that a head part of the tower body (1) is connected to a front part of the crane boom (2) by a crane pull arm (4), and that the head part of the tower body (1) is connected to a rear part of the compensating arm (3) by a compensating pull arm (5); that a lever signal detection rod (6) is provided at the middle of the head part of the tower body (1), and a first pressure sensor (7) and a second pressure sensor (8) are provided on both sides of a lower end of the lever signal detection rod (6); that a counterweight (9) is provided on the balancing arm (3), and a moving hook (10) and a blower (11) are provided on the crane boom (2). [2] A torque-free tower crane according to claim 1, characterized by, that a crane winch (12) is provided on the compensating arm (3), which is connected to the counterweight (9) and pulls it to move along the compensating arm (3). [3] A torque-free tower crane according to claim 2, characterized by , that a self-balancing winch (13) is provided above the compensating arm (3), a first sliding wheel (14) is provided on the tower body (1), a second sliding wheel (15) is provided on the crane boom (2), and a pull rope (16) of the self-balancing winch (13) is connected to the movement hook (10) after being wound around a head part of the first sliding wheel (14) and a lower part of the second sliding wheel (15). [4] A torque-free tower crane according to claim 3, characterized by, that the crane drawbar (4) comprises an end drawbar (17) by which the head part of the tower body (1) is connected to an end part of the crane boom (2), and an auxiliary drawbar (18) by which the head part of the tower body (1) is connected to the front part of the crane boom (2).