Temporary counterweight universal wheel anti-shaking device of tower crane

Abstract

The invention discloses a tower crane temporary counterweight universal wheel anti-shaking device, belongs to the technical field of hoisting equipment, and mainly solves the problems that an existing tower crane temporary counterweight easily shakes in the moving and rotating operation, and the safety is influenced. The device comprises a temporary counterweight main body, a lifting hydraulic oil cylinder and a core universal wheel assembly; the universal wheel assembly is rotatably installed on the side face of the temporary balance weight body through a rotating pin shaft and can be switched between the working position and the retracting position. The assembly comprises a universal wheel, a mechanical brake for locking rotation and an elastic piece for providing pre-tightening force, when the temporary counterweight is lifted and moved, the universal wheel assembly is located at a working position, the elastic piece enables the universal wheel to be tightly attached to the ground and only bears a small part of weight of the counterweight, and transverse shaking is effectively restrained through grounding friction and brake locking; the device can be withdrawn during non-operation, and interference is avoided; the temporary counterweight device is simple and reliable in structure, and the stability and safety of temporary counterweight operation are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, specifically to a temporary counterweight caster anti-sway device for a tower crane. Background Technology

[0002] In tower crane operations, temporary counterweights are often required to balance the overturning moment generated by the load. Currently, temporary counterweights mostly use a structure of containers combined with sand and gravel. While this provides the necessary weight, it has significant drawbacks in practical use: when the crane's counterweight trolley moves the temporary counterweight along the track, or during boom rotation, the temporary counterweight is prone to significant lateral swaying due to inertia and wind loads. This swaying not only makes positioning difficult and reduces efficiency, but also seriously threatens the overall stability and operational safety of the crane, posing a risk of overturning. Existing technology lacks a dedicated, simple, and reliable device for effectively suppressing swaying during the movement of temporary counterweights. Summary of the Invention

[0003] This invention overcomes the shortcomings of the existing technology and provides a sway-resistant device for casters that is simple in structure, reliable in operation, and can effectively suppress the swaying of temporary counterweights of tower cranes during movement and operation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a temporary counterweight caster anti-sway device for tower cranes, including a temporary counterweight body and a hydraulic cylinder for lifting the temporary counterweight body, and also including at least one set of caster wheel assembly; The caster wheel assembly is rotatably connected to the side of the temporary counterweight body via a rotating pin, so that the caster wheel assembly has a working position in which the caster wheel contacts the ground, and a retracted position in which the caster wheel leaves the ground. The caster wheel assembly includes a caster wheel, a mechanical brake for locking the caster wheel in rotation, and an elastic element that applies a preload force to the caster wheel to keep it in contact with the ground.

[0005] Furthermore, the elastic element is a compression spring, one end of which acts on the temporary counterweight body or the component fixed to the rotating pin, and the other end acts on the bracket of the caster wheel.

[0006] Furthermore, the caster wheel assembly also includes a fixing pin, and the temporary counterweight body and the bracket of the caster wheel assembly are respectively provided with pin holes for the fixing pin to be inserted, so as to lock the caster wheel assembly in the working position or the retracted position.

[0007] Furthermore, there are two sets of the omnidirectional wheel assemblies, which are symmetrically installed in the middle of the two opposite sides of the temporary counterweight body.

[0008] Furthermore, it also includes a pressure sensor, which is installed in the hydraulic circuit of the hydraulic cylinder to monitor the hydraulic pressure of lifting the temporary counterweight body in real time.

[0009] Furthermore, it also includes a wireless transmission module, which is connected to the pressure sensor signal and is used to wirelessly transmit the data monitored by the pressure sensor to the control system of the tower crane.

[0010] Furthermore, the omnidirectional wheel assembly is connected to the middle position of the side of the temporary counterweight body.

[0011] Furthermore, when the caster assembly is in the working position and the temporary counterweight body is lifted by the hydraulic cylinder, the load-bearing capacity of the caster is configured to bear only a small proportion of the total weight of the temporary counterweight body.

[0012] The advantages of this invention compared to existing technologies are as follows: By positioning the caster assembly in the working position and ensuring the casters are firmly attached to the ground under the action of elastic elements, the casters bear only a small portion of the weight (approximately 5%) when the temporary counterweight is lifted and moved. Their contact with the ground provides continuous lateral friction constraint. Combined with the locking function of the mechanical brake, it effectively suppresses the lateral swaying of the temporary counterweight under movement, rotation, and wind load conditions. Actual measured swaying is significantly reduced, resulting in a substantial improvement in operational stability. The design of the elastic elements (such as springs) in this invention allows the casters to adapt to slight ground undulations, ensuring reliable grounding under various site conditions. This prevents constraint failure and increased swaying due to wheel suspension. Furthermore, the mechanical structure ensures robustness and durability. This invention features a retractable design; it can be lowered for operation and retracted and locked when not in use or during transport, preventing accidental bumps and interference. The low load-bearing design reduces the stress on the device itself, extending its service life, while ensuring the crane's main structure remains the primary load-bearer, providing a high system safety margin. This invention, through optional pressure sensors and wireless transmission modules, can monitor the lifting force status in real time, providing data support for torque balance calculations in the crane control system, and further enhancing the safety and controllability of the entire operation process. Attached Figure Description

[0013] The present invention will now be further described with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle.

[0016] Figure 3 This is a schematic diagram of the universal wheel assembly in the retracted state in this invention.

[0017] Figure 4 This is a schematic diagram of the universal wheel assembly in the working state in this invention.

[0018] In the diagram: 1 is the temporary counterweight, 2 is the hydraulic cylinder, 3 is the caster assembly, 30 is the caster, 31 is the mechanical brake, 32 is the elastic element, 33 is the fixed pin, 34 is the rotating pin, 4 is the pressure sensor, and 5 is the wireless transmission module. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] like Figures 1 to 4 As shown, this invention provides a temporary counterweight caster anti-sway device for a tower crane. The temporary counterweight body 1 is typically a container structure, filled with counterweights such as sand and gravel. A hydraulic cylinder 2 is installed on top of the temporary counterweight body 1, used to connect to the crane's counterweight trolley and perform lifting actions. In this invention, the length of the counterweight wire rope is fixed, and the counterweight wire rope is connected to the temporary counterweight body 1 via the hydraulic cylinder 2. The extension and retraction of the hydraulic cylinder 2 lifts or lowers the temporary counterweight body 1.

[0021] In this embodiment, the caster wheel assembly 3 is hinged to the middle of the side of the temporary counterweight body 1 via a rotating pin 34. The assembly includes a caster wheel 30, a mechanical brake 31, a compression spring as an elastic element 32, and a fixing pin 33 for locking the state.

[0022] When the component is in the working position, the compression spring 32 generates force, causing the wheel surface of the caster 30 to continuously press against the ground. The fixing pin 33 is inserted into the corresponding pin hole to lock the component in this position. At this time, if the hydraulic cylinder 2 is operated to lift the temporary counterweight body 1, the control system can be adjusted so that most of the weight of the temporary counterweight body 1 (e.g., 95%) is borne by the crane, while the caster 30 only bears the remaining small portion of the weight (e.g., 5%). In this state, when moving the temporary counterweight, the caster 30 can roll freely, providing mobility, while its contact with the ground provides effective lateral restraint. If further enhancement of the anti-sway effect is required (e.g., during boom rotation), the mechanical brake 31 can be operated to lock the caster 30, making it a fixed fulcrum.

[0023] When the operation is completed or a long-distance transfer is required, the fixing pin 33 can be pulled out, and the entire caster wheel assembly 3 can be rotated upward around the rotating pin 34 until it is close to or stored on the side of the temporary counterweight body 1. Then the fixing pin 33 can be inserted to lock it in the retracted position to avoid interference.

[0024] As an optimization, a pressure sensor 4 can be installed in the hydraulic circuit of the hydraulic cylinder 2 to monitor the lifting force in real time. This data can be transmitted to the control system in the crane cab via a wireless transmission module 5, enabling status monitoring and intelligent assistance.

[0025] Preferably, a set of universal wheel assemblies 3 can be symmetrically installed on each of the two opposite sides of the temporary counterweight body 1 to provide more balanced anti-sway support.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A temporary counterweight caster anti-sway device for a tower crane, comprising a temporary counterweight body (1) and a hydraulic cylinder (2) for lifting the temporary counterweight body (1), characterized in that: It also includes at least one set of caster wheel assembly (3); The caster assembly (3) is rotatably connected to the side of the temporary counterweight body (1) via a rotating pin (34), so that the caster assembly (3) has a working position in which the caster (30) contacts the ground, and a retracted position in which the caster (30) leaves the ground. The caster assembly (3) includes a caster (30), a mechanical brake (31) for locking the caster (30) from rotating, and an elastic element (32) for applying a preload force to the caster (30) to keep it in contact with the ground.

2. The anti-sway device for temporary counterweight casters of tower cranes according to claim 1, characterized in that, The elastic element (32) is a compression spring. One end of the compression spring acts on the temporary counterweight body (1) or the component fixed to the rotating pin (34), and the other end acts on the bracket of the universal wheel (30).

3. The anti-sway device for temporary counterweight casters of tower cranes according to claim 1 or 2, characterized in that, The universal wheel assembly (3) also includes a fixing pin (33). The temporary counterweight body (1) and the bracket of the universal wheel assembly (3) are respectively provided with pin holes for the fixing pin (33) to be inserted, so as to lock the universal wheel assembly (3) in the working position or the retracted position.

4. The anti-sway device for temporary counterweight casters of tower cranes according to claim 1, characterized in that, The number of the universal wheel assembly (3) is two sets, which are symmetrically installed in the middle of the two opposite sides of the temporary counterweight body (1).

5. The anti-sway device for temporary counterweight casters of tower cranes according to claim 1, characterized in that, It also includes a pressure sensor (4), which is installed on the hydraulic oil circuit of the hydraulic cylinder (2) to monitor the hydraulic pressure of lifting the temporary counterweight body (1) in real time.

6. The anti-sway device for temporary counterweight casters of tower cranes according to claim 5, characterized in that, It also includes a wireless transmission module (5), which is signal-connected to the pressure sensor (4) and is used to wirelessly transmit the data monitored by the pressure sensor (4) to the control system of the tower crane.

7. The anti-sway device for temporary counterweight casters of tower cranes according to claim 1, characterized in that, The universal wheel assembly (3) is connected to the middle of the side of the temporary counterweight body (1).

8. The anti-sway device for temporary counterweight casters of tower cranes according to claim 1, characterized in that, When the caster assembly (3) is in the working position and the temporary counterweight body (1) is lifted by the hydraulic cylinder (2), the load-bearing capacity of the caster (30) is configured to bear only a small proportion of the total weight of the temporary counterweight body (1).

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