Lifting cylinder adjustment device for tower crane

Abstract

The present invention discloses a lifting cylinder adjustment device for a tower crane, and belongs to the technical field of tower cranes. The present invention comprises a stopper fixed on a climbing frame, a turntable is installed on one side of the stopper, a screw is inserted in the middle of the turntable, the screw is threadedly matched with the axial threaded hole in the middle of the turntable to form a spiral feeding mechanism, the screw passes through the stopper and slides with the through hole in the stopper, and one end of the screw passing through the stopper is hinged with a clamp for clamping the lifting cylinder. The ear plate is a longitudinal ear plate, and the through hole on the ear plate is a longitudinal long hole. The through hole on the stopper is a transverse long hole. The present invention realizes the swing adjustment of the lifting cylinder in a low-cost and simple way, can be fine-tuned, and does not generate lateral force on the cylinder when the lifting cylinder is working.

Description

Technical Field

[0001] This invention relates to a lifting cylinder adjustment device, belonging to the technical field of tower cranes. Background Art

[0002] Currently, during tower crane jacking operations, a hydraulic cylinder is used to push the jacking beam, which is then hooked onto the steps of a standard section for jacking. (Refer to the attached diagram in the instruction manual.) Figure 3 The lifting beam needs to be moved horizontally when it is attached to the step. This requires rotating the hydraulic cylinder around the root hinge point by a certain angle to create an approximately horizontal displacement at the end of the hydraulic cylinder push rod.

[0003] During the process of retracting the lifting beam after the lifting is completed, obstacles on the tower body and the support frame must be avoided. Therefore, the lifting beam still needs to be moved horizontally within a certain range. For small and medium-sized tower cranes, the lifting beam and hydraulic cylinder are relatively light, and a small horizontal force is sufficient to push the lifting beam out the required distance. In actual operation, manual adjustment is generally used.

[0004] However, for ultra-large tonnage tower cranes, the horizontal thrust is significant, making manual adjustment difficult and requiring mechanical assistance. Existing technology utilizes auxiliary hydraulic cylinders; please refer to the attached diagram in the instruction manual. Figure 4 The auxiliary hydraulic cylinder is placed horizontally, with its tail hinged to the climbing frame, and its push rod head hinged to the lower part of the main hydraulic cylinder. When the push rod of the auxiliary hydraulic cylinder extends and retracts, it can realize the horizontal movement of the lifting beam.

[0005] The disadvantages of using an auxiliary hydraulic cylinder are: it is generally more expensive, and under certain cost constraints, the stroke of the auxiliary hydraulic cylinder cannot be precisely controlled. When the main hydraulic cylinder is working, it cannot withstand lateral forces, meaning the auxiliary hydraulic cylinder hinders the main cylinder's slight oscillations. During lifting operations, the main hydraulic cylinder needs to make slight oscillations, but the enclosed hydraulic oil in the auxiliary cylinder will hinder these oscillations and generate lateral forces on the cylinder. This lateral thrust is harmful, affecting the stability of the main hydraulic cylinder and easily causing cylinder instability accidents. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a lifting cylinder adjustment device for tower cranes, which realizes the swing adjustment of the lifting cylinder in a low-cost and simple manner, can make micro-adjustments, and does not generate lateral force on the cylinder when the lifting cylinder is working.

[0007] The present invention is achieved through the following technical solution: a lifting cylinder adjustment device for a tower crane, comprising a stop block fixed on a climbing frame, a turntable installed on one side of the stop block, a screw inserted in the middle of the turntable, the screw threadedly engaging with a threaded hole in the axial direction of the turntable to form a helical feeding mechanism, the screw passing through the stop block and slidingly engaging with a through hole in the stop block, and a clamp for holding the lifting cylinder being hinged to one end of the screw passing through the stop block.

[0008] Furthermore, a washer is provided on the contact surface between the clamp and the lifting cylinder.

[0009] Furthermore, the washer is a rubber washer.

[0010] Furthermore, the end of the screw is hinged to the clamp via two lugs and a hinge shaft, the two lugs being fixed to the clamp, and the hinge shaft passing through the two lugs and the end of the screw.

[0011] Furthermore, the hinge shaft is a hinge pin or bolt.

[0012] Furthermore, the ear plate is a longitudinal ear plate, and the through hole on the ear plate is a longitudinal elongated hole.

[0013] Furthermore, the through hole on the stop block is a transverse elongated hole.

[0014] Furthermore, the stop block is welded to the climbing frame.

[0015] The beneficial effects of this invention are:

[0016] This invention has a simple structure, low cost, and good operability.

[0017] This invention enables the force of the hydraulic cylinder to sway during the horizontal movement of the lifting beam to be gradually reduced through the threads and turntable, making it easy to operate manually. Furthermore, the adjustment amount is positively correlated with the number of rotations, allowing for fine-tuning over small distances.

[0018] The present invention provides elongated holes between the screw and the clamp, and between the screw and the sleeve block, which allows the screw to move slightly within a certain range, ensuring that the screw only bears axial force.

[0019] Using this invention, when the lifting cylinder is in operation, the turntable can rotate a greater distance, allowing the screw to move slightly with the cylinder, thus avoiding the generation of lateral forces.

[0020] The clamping method of this invention for holding the hydraulic cylinder is convenient for installation and does not damage the hydraulic cylinder. It avoids welding ear plates to the hydraulic cylinder and provides good protection for the hydraulic cylinder. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and examples.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a diagram showing the usage status of the present invention;

[0024] Figure 3 This is a schematic diagram illustrating the working principle of the lifting cylinder in the background technology.

[0025] Figure 4 This is a schematic diagram of an auxiliary hydraulic cylinder solution in the existing technology.

[0026] In the figure, washer 1, clamp 2, hinge shaft 3, screw 4, stop block 5, transverse long hole 5-1, turntable 6, climbing frame 7, lifting cylinder 8, cylinder push rod 8-1, cylinder hinge point 8-2, ear plate 9, longitudinal long hole 9-1, lifting beam 10, and auxiliary cylinder 11. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification.

[0029] like Figure 1 , Figure 2 The diagram illustrates a tower crane lifting cylinder adjustment device, comprising a stop 5 fixed to a climbing frame 7. The climbing frame 7 is a structure used for tower crane climbing during operation. The stop 5 assists in the horizontal movement of the screw and also serves as a limit. A turntable 6 is mounted on one side of the stop 5, with a screw 4 inserted through its center. The screw 4 engages with a threaded hole in the axial direction of the turntable 6 to form a helical feeding mechanism. The turntable can be manually driven to rotate. The turntable has a threaded hole in its center; when the turntable rotates, it can be engaged with the fixed stop to extend the screw or allow the lifting cylinder to reset under its own weight. The turntable 6 can be limited by the stop 5, meaning the screw 4 can only be pulled outwards or extended using the weight of the cylinder to reset the lifting cylinder. The screw 4 passes through the stop 5 and slides within a through hole in the stop 5. The horizontal movement of the screw allows the lifting cylinder to deflect at a certain angle. One end of the screw 4, which passes through the stop block 5, is hinged to a clamp 2 for holding the lifting cylinder 8. The clamp 2 can clamp the cylinder, making it a single unit with the cylinder.

[0030] Furthermore, a washer 1 is provided on the contact surface between the clamp 2 and the lifting cylinder 8. The washer 1 is preferably a rubber washer. The washer serves to protect and increase friction, and is placed between the clamp and the cylinder.

[0031] Furthermore, the end of the screw 4 is hinged to the clamp 2 via two lugs 9 and a hinge shaft 3. The two lugs 9 are fixed on the clamp 2, and the hinge shaft 3 passes through the two lugs 9 and the end of the screw 4.

[0032] Furthermore, the hinge shaft 3 is a hinge pin or bolt.

[0033] Furthermore, the ear plate 9 is a longitudinal ear plate, and the through hole on the ear plate is a longitudinal elongated hole 9-1. The ear plate 9 and the hinge shaft 3 connect the clamp and the screw, and at the same time allow the screw to move vertically within a certain range.

[0034] Furthermore, the through hole on the stop block 5 is a transverse elongated hole 5-1, which allows the screw to make slight movements in the horizontal direction.

[0035] Furthermore, the stop block 5 is welded onto the climbing frame 7.

[0036] The working principle of this invention is as follows: This invention employs a clamping method to reliably connect the adjusting device to the lifting cylinder. It utilizes the principle of threaded transmission to convert a smaller driving force into a larger horizontal force, while also allowing for fine-tuning. No lateral force is generated when the lifting cylinder is in operation.

[0037] The lifting cylinder is clamped by clamps and hinged to a screw. A threaded hole is provided within the turntable, which is horizontally limited by a structure on the sleeve. When the turntable rotates, the screw moves horizontally relative to the sleeve, causing the lifting cylinder to sway and the lifting beam to move horizontally. This horizontal movement is highly controllable and allows for fine-tuning. When the lifting cylinder is working, the turntable can rotate further to create a certain distance between the turntable and the stop, allowing the lifting cylinder to swing freely without generating lateral force.

[0038] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lifting cylinder adjustment device for a tower crane, characterized in that: It comprises a stopper (5) fixed on a climbing frame (7), a turntable (6) being installed on one side of the stopper (5), a screw rod (4) being inserted through the middle of the turntable (6), the screw rod (4) being threadedly matched with an axial threaded hole in the middle of the turntable (6) to form a spiral feeding mechanism, the screw rod (4) passing through the stopper (5) and slidingly matched with a through hole in the stopper (5), and a clamp (2) for clamping a lifting cylinder (8) being hingedly connected to one end of the screw rod (4) passing through the stopper (5); The end of the screw rod (4) is hinged to the clamp (2) via two ear plates (9) and a hinge shaft (3), the two ear plates (9) are fixed on the clamp (2), and the hinge shaft (3) passes through the two ear plates (9) and the end of the screw rod (4); The ear plate (9) is a longitudinal ear plate, and the through hole on the ear plate is a longitudinal long hole (9-1); The through hole on the stopper (5) is a transverse long hole (5-1).

2. The jacking cylinder adjustment device for a tower crane according to claim 1, characterized in that: A gasket (1) is provided on the contact surface between the clamp (2) and the lifting cylinder (8).

3. The jacking cylinder adjustment device for a tower crane according to claim 2, characterized in that: The gasket (1) is a rubber gasket.

4. The jacking cylinder adjustment device for a tower crane according to claim 1, characterized in that: The hinge shaft (3) is a hinge pin or a bolt.

5. The jacking cylinder adjustment device for a tower crane according to claim 1, characterized in that: The stopper (5) is welded to the climbing frame (7).

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