Torque-free tower crane

Abstract

The invention discloses a torque-free tower crane, which relates to the technical field of cranes, and comprises a tower body, a cargo boom and a balance arm, the top of the tower body is connected with the front part of the lifting arm through a lifting pull arm and is connected with the rear part of the balance arm through a balance pull arm; a lever signal acquisition rod is arranged in the center of the top of the tower body; a first pressure sensor and a second pressure sensor are respectively arranged on two sides of the lower end of the lever signal acquisition rod; a movable balance weight is arranged on the balance arm, and a movable lifting hook and an air blower are arranged on the lifting arm. The lever signal acquisition rod is matched with the pressure sensors on the two sides, so that the no-load and heavy-load conditions of the crane are detected, then the movable balance weight is controlled to adjust the position, and the effects of protecting a tower body and improving the lifting capacity are achieved. According to the invention, the rotation of the cargo boom is realized through the counter-acting force of the air blower to the air without influencing the cargo boom or the tower body; soft starting can be achieved through air blower driving, impact is avoided, and the structure is simple; and the use and maintenance cost of the crane is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cranes, and in particular to a torque-free tower crane. Background Art

[0002] In order to lift heavy objects far away, the existing cranes have a fixed counterweight and a fixed lever arm. This will cause the tower to tilt toward the counterweight when it is empty or lightly loaded. When loaded, the lifting capacity will drop sharply, and the tower will also tilt toward the boom, causing torque on the tower and metal fatigue, which will reduce its service life.

[0003] The existing tower crane boom rotation relies on the rotating gear to drive the tower body fixed gear ring to rotate the boom, and correspondingly, the torque is transmitted to the tower body at the same time, and the tower body is twisted to cause damage.

[0004] Therefore, a torque-free tower crane has become an urgent problem to be solved. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a torque-free tower crane to achieve torque balance during lifting operations and improve the stability, safety and lifting capacity of the crane.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a torque-free tower crane, comprising a tower body, a boom and a balance arm; the top of the tower body is connected to the front part of the boom through a lifting arm, and the top of the tower body is connected to the rear part of the balance arm through a balance arm;

[0007] A lever signal collection rod is provided at the center of the top of the tower body, and a first pressure sensor and a second pressure sensor are provided on both sides of the lower end of the lever signal collection rod respectively;

[0008] The balance arm is provided with a movable counterweight, and the lifting arm is provided with a movable hook and a blower.

[0009] Furthermore, a hoisting winch is provided on the balancing arm, and the hoisting winch is connected to the moving counterweight and pulls it to move along the balancing arm.

[0010] Furthermore, a second winch is provided above the balance arm, a first pulley is provided on the tower body, a second pulley is provided on the lifting arm, and a traction rope of the second winch passes around the top of the first pulley and the bottom of the second pulley and is then connected to a movable hook.

[0011] Furthermore, the lifting arm includes an end pull rod connecting the top of the tower body and the end of the lifting arm and an auxiliary pull rod connecting the top of the tower body and the front of the lifting arm.

[0012] The advantages of the present invention compared with the prior art are:

[0013] 1. The present invention detects the empty and overload conditions of the crane by cooperating with the pressure sensors on both sides through the lever signal collection rod, and then controls the movable counterweight to adjust the position, thereby achieving the effect of protecting the tower body and improving the lifting capacity.

[0014] 2. The present invention realizes the rotation of the boom by the reaction force of the blower on the air without affecting the boom or the tower body; the blower drive can realize soft start, no impact, and simple structure; and reduce the use and maintenance costs of the crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a torque-free tower crane of the present invention.

[0016] As shown in the figure: 1. Tower body, 2. Lifting arm, 3. Balance arm, 4. Lifting pulling arm, 5. Balance pulling arm, 6. Lever signal collection rod, 7. First pressure sensor, 8. Second pressure sensor, 9. Mobile counterweight, 10. Mobile hook, 11. Blower, 12. Lifting winch, 13. Second winch, 14. First pulley, 15. Second pulley, 16. Traction rope, 17. End pull rod, 18. Auxiliary pull rod. DETAILED DESCRIPTION

[0017] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “inside”, “outside”, “vertical” and “circumferential” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, "first feature" and "second feature" may include one or more of the features. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0019] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] A torque-free tower crane of the present invention is further described in detail below with reference to the accompanying drawings.

[0021] Combined with Figure 1 , the present invention is introduced in detail.

[0022] A torque-free tower crane comprises a tower body 1, a boom 2 and a balance arm 3; the top of the tower body 1 is connected to the front of the boom 2 through a lifting arm 4, and the top of the tower body 1 is also connected to the rear of the balance arm 3 through a balance arm 5. This connection method enables the boom 2 and the balance arm 3 to form an effective moment balance when subjected to force, thereby reducing the generation of torque.

[0023] Furthermore, a lever signal collection rod 6 is provided at the center of the top of the tower body 1, and a first pressure sensor 7 and a second pressure sensor 8 are provided on both sides of the lower end of the collection rod. Through these two sensors, the force condition at the top of the tower body 1 can be monitored in real time, so as to determine whether the crane is in a torque balance state. Once a torque imbalance is detected, measures can be taken immediately to adjust it to ensure the safety of the lifting operation.

[0024] In addition, a movable counterweight 9 is provided on the balance arm 3, and by adjusting the position of the counterweight, the torque generated by the boom 2 can be further balanced. At the same time, a movable hook 10 and a blower 11 are provided on the boom 2, and the blower 11 can blow air and use the reaction force of the air to realize the rotation of the boom 2 to achieve the purpose of luffing.

[0025] As a further improvement of the present invention, a hoisting winch 12 is provided on the balancing arm 3, and the winch is connected to the moving counterweight 9 and pulls it to move along the balancing arm 3. In this way, the hoisting winch 12 can be controlled by the first pressure sensor 7 and the second pressure sensor 8 to conveniently adjust the position of the moving counterweight 9 to achieve dynamic balance of torque; according to actual needs, the hoisting winch 12 can also be replaced with a hydraulic traction device or other devices with retractable traction functions.

[0026] Furthermore, a second winch 13 is provided above the balance arm 3, a first pulley 14 is provided on the tower body 1, and a second pulley 15 is provided on the lifting arm 2. The traction rope 16 of the second winch 13 passes through the top of the first pulley 14 and the bottom of the second pulley 15 and then connects to the moving hook 10. This design enables the pulling force of the traction rope 16 to be more effectively transmitted to the moving hook 10, while reducing friction and loss, and improving the lifting efficiency.

[0027] In addition, the lifting arm 4 includes an end tie rod 17 connecting the top of the tower body 1 and the end of the boom 2 and an auxiliary tie rod 18 connecting the top of the tower body 1 and the front of the boom 2. Such a design enhances the connection strength between the boom 2 and the tower body 1, making the boom 2 more stable when subjected to force. The lifting arm 4 has both the function of the tie rod itself and the function of weighing or weight transfer.

[0028] The specific implementation process of a torque-free tower crane of the present invention is as follows:

[0029] Combined with Figure 1 When the crane is unloaded or lightly loaded, the movable counterweight 9 moves toward point O in the middle of the tower body 1, the lever signal collection rod 6 is located between the first pressure sensor 7 (E2) and the second pressure sensor 8 (E1), and the tower body 1 will not tilt.

[0030] When lifting heavier or farther, the lever signal collection rod 6 triggers a signal to the first pressure sensor 7 (E2), and the moving counterweight 9 moves toward the end A of the balance arm 3. The lever signal collection rod 6 returns to the middle of the first pressure sensor 7 (E2) and the second pressure sensor 8 (E1), and the tower body 1 does not tilt, thereby achieving the effect of protecting the tower body 1 and improving the lifting capacity.

[0031] The reaction force of the blower 11 on the air is used to realize the rotation of the boom 2 without affecting the boom 2 and the tower body 1; the blower 11 is used to drive the crane so as to realize soft start without impact and simple structure; and the use and maintenance cost of the crane is reduced.

[0032] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A torque-free tower crane, characterized in that: It comprises a tower body (1), a lifting arm (2) and a balancing arm (3); the top of the tower body (1) is connected to the front part of the lifting arm (2) via a lifting arm (4), and the top of the tower body (1) is connected to the rear part of the balancing arm (3) via a balancing arm (5); A lever signal collection rod (6) is provided at the center of the top of the tower body (1), and a first pressure sensor (7) and a second pressure sensor (8) are provided on both sides of the lower end of the lever signal collection rod (6); The balancing arm (3) is provided with a movable counterweight (9), and the lifting arm (2) is provided with a movable hook (10) and a blower (11).

2. A torque-free tower crane according to claim 1, characterized in that: The balancing arm (3) is provided with a hoisting winch (12), and the hoisting winch (12) is connected to the movable counterweight (9) and pulls the counterweight to move along the balancing arm (3).

3. A torque-free tower crane according to claim 2, characterized in that: A self-balancing winch (13) is provided above the balancing arm (3), a first pulley (14) is provided on the tower body (1), a second pulley (15) is provided on the lifting arm (2), and a traction rope (16) of the self-balancing winch (13) is connected to a movable hook (10) after passing around the top of the first pulley (14) and the bottom of the second pulley (15).

4. A torque-free tower crane according to claim 3, characterized in that: The lifting arm (4) comprises an end pull rod (17) connecting the top of the tower body (1) and the end of the lifting arm (2) and an auxiliary pull rod (18) connecting the top of the tower body (1) and the front of the lifting arm (2).

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