Crane counterweight self-installation structure

Abstract

The utility model discloses a crane balancing weight self-installation structure which comprises a balancing weight and a connecting piece enabling the balancing weight to be connected with a lifting arm and a rotary table, a first pulley is installed on the balancing weight, a second pulley is installed on the rotary table, the starting end of the connecting piece is connected with the rotary table, and the starting end of the connecting piece is connected with the lifting arm. And the terminal is connected with the rotary table after bypassing the pulley block, the second pulley and the first pulley which are arranged on the cargo boom body in sequence. According to the utility model, the second pulley arranged on the balancing weight is a fixed pulley in the ascending and descending process of the balancing weight, and the load on the cargo boom is reduced in the process of self-driving the balancing weight to ascend and descend through the cargo boom, so that the performance of the cargo boom is favorably maintained.

Description

Technical Field

[0001] The utility model relates to a crane accessory, in particular to a crane counterweight self-installation structure. Background Art

[0002] An off-road tire crane is a wheeled crane that can use outriggers to support lifting operations and can also use tires to lift and travel with the load. The counterweight is an important component of an off-road tire crane. Its function is to generate an anti-overturning moment to prevent the entire machine from tipping over when the off-road tire crane is lifting. Conventional counterweight attachment is generally achieved through a counterweight attachment mechanism. The counterweight attachment mechanism includes an attachment cylinder, an attachment cylinder bracket, and a counterweight. The attachment cylinder is fixed on both sides of the rear section of the crane's slewing turntable structure. The rear section of the turntable is often equipped with a lifting hydraulic system and an electrical system. The space is compact, and it interacts with the counterweight attachment mechanism. The installation and maintenance convenience is poor, and the cylinder layout position is limited. In addition, the cylinder attachment system is relatively expensive, the attachment system is complex, there are many failure points, and the reliability is poor.

[0003] The invention patent with publication number CN 109335972 A discloses a self-loading and unloading device for a lifting mechanism, in which a counterweight is connected to a crane arm through a connecting piece bypassing a mounting portion, so that when the crane arm rotates relative to the mounting platform, the counterweight moves closer to or farther from the mounting portion under the action of the connecting piece. In this solution, the driving force of the counterweight comes from the crane arm, which will reduce the performance of the crane arm. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a self-installing structure for a crane counterweight that maintains the performance of the crane boom.

[0005] Technical solution: The utility model discloses a self-installation structure for a crane counterweight, wherein the counterweight block is provided with a first pulley, the connecting member is connected to the crane turntable at the beginning, and the terminal successively bypasses the reversing pulley set on the boom body, the second pulley set on the turntable, and the first pulley, and is connected to the turntable bottom plate. In the utility model, the second pulley provided on the counterweight block is a fixed pulley during the process of the counterweight block rising and falling. When the counterweight block is self-driven by the boom to rise and fall, the load on the boom is reduced, which is conducive to maintaining the performance of the boom.

[0006] Preferably, the connecting member is connected to the driving mechanism behind the turntable at its beginning. The movable pulley is provided to reduce the load on the boom, but when the counterweight block rises and falls to the same height, the required length of the connecting member increases, and it is connected to the winch mechanism to accurately control the rising and falling height of the counterweight block, while further reducing the load on the boom.

[0007] Preferably, the reversing pulley block is connected to the telescopic mechanism at the top of the boom, so as to make full use of the structure of the crane itself.

[0008] Preferably, in order to maintain the stability of the lifting process of the counterweight, the first pulleys are symmetrically arranged at both ends of the counterweight, and the end of the connecting member is provided with branches with the same number as the first pulleys. The branches cooperate with the first pulleys one by one to maintain the balance of the counterweight.

[0009] Preferably, the reversing pulley block is connected to a side of the boom body close to the turntable.

[0010] Preferably, the terminal of the connector is detachably connected to the bottom plate of the turntable, so that the counterweight block is detachably connected to the turntable, the bottom plate of the turntable can be fitted and fixed with the balancing weight, and the spatial layout is compact.

[0011] Preferably, the connecting member is a flexible connecting member.

[0012] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. Maintaining the performance of the crane's lifting arm; 2. Making full use of the crane's own structure: no additional counterweight lifting device (such as a double oil cylinder) and hydraulic and electrical pipe line interface are required, which effectively reduces the weight of the whole machine and reduces the cost of use; 3. Compact spatial layout; 4. Simple structure: flexible parts realize lifting and hanging, and a large degree of freedom is allowed before and after hanging. There is no need for precise positioning and guiding, or a simple positioning block can be used. The hanging is convenient and quick, and is not limited by the stroke of the hanging cylinder; 5. Easy to install and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the first embodiment of the utility model;

[0014] Figure 2 This is a schematic structural diagram of a second embodiment of the utility model;

[0015] Figure 3 This is a schematic structural diagram of the third embodiment of the present utility model. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0017] Example 1: Figure 1As shown, it is a schematic diagram of the structure of the utility model. The self-balancing installation structure is mainly composed of a counterweight 2 and a connector 4 that connects the counterweight 2 to the boom 1 and the turntable 3. Among them, a pulley 21 is installed on the counterweight 1, and the connector 4 is connected to the turntable 3 or the driving mechanism set on the rear bottom plate of the turntable 3 at the beginning, and the terminal successively bypasses the pulley block 5 installed on the arm body of the boom 2 and the pulley 31 installed on the turntable 3, and finally bypasses the pulley 11 to connect with the turntable bottom plate of the turntable 3. The pulley block 5 is used for reversing, the pulley 31 is used for guiding, and the pulley 21 acts as a movable pulley. The counterweight is driven up and down by the crane's own driving mechanism. When the connector 4 is connected to the main / auxiliary lifting drum set on the rear bottom plate of the turntable 3 at the beginning, the main / auxiliary lifting drum acts as a driving structure to realize the lifting and falling movement of the counterweight 2, and the installation position of the pulley block 5 is not restricted. When the connector 4 is fixedly connected to the turntable 3 at the beginning, the pulley block 5 is installed at the top of the boom and connected to the telescopic mechanism. The telescopic mechanism serves as a driving device, and the pulley block 5 is synchronously telescoped with the arm head of the boom 2 to realize the lifting and falling of the counterweight 2. The connector 4 is a flexible connector, which can be a steel wire rope, or other ropes or flexible components such as belts and chains can be used partially or completely. The pulley 21 can be one, which is individually arranged in the middle of the top of the counterweight 1, or it can be multiple, which are evenly arranged on both sides and / or both ends, both sides and the center line of the counterweight. When multiple pulleys are provided, a branch corresponding to the pulley 21 is provided at the end of the connector 4, and the branch bypasses the pulley 21 and is connected to the turntable 3.

[0018] Embodiment 2: Compared with Embodiment 1, this embodiment may have the following variations: the pulley block 5 is fixed to a side of the boom 1 close to the turntable 3 .

[0019] Embodiment 3: Compared with Embodiment 1, this embodiment may have the following variations: the terminal end of the connecting member 4 is detachably connected to the bottom plate of the turntable 3; when in the hanging state, the terminal end of the connecting member 4 can be quickly installed on the rear section of the turntable 3; when in the non-hanging state, it can be removed from the rear section of the turntable 3, recovered from the tail of the lifting arm 1 to the bottom of the arm head through the pulley block 5, and connected to the lower hook.

Claims

1. A crane counterweight self-installation structure, comprising a counterweight block (2) and a connecting piece (4), characterized in that: The counterweight block (2) is provided with a first pulley (21), the connecting member is connected to the crane turntable (3) at its starting end, and the terminal end sequentially passes through a reversing pulley block (5) provided on the arm body of the crane arm (1), a second pulley (31) provided on the turntable, and the first pulley (21), and is connected to the bottom plate of the turntable (3).

2. The crane counterweight self-installation structure according to claim 1, characterized in that: The connecting member (4) is connected at its beginning end to the driving mechanism at the rear of the turntable (3).

3. The crane counterweight self-installation structure according to claim 1, characterized in that: The reversing pulley block (5) is connected to the telescopic mechanism at the top end of the boom (1).

4. The crane counterweight self-installation structure according to claim 1, characterized in that: The first pulley (21) is symmetrically arranged at the two ends of the counterweight (2), and the end of the connecting member is provided with branches having the same number as the first pulley.

5. The crane counterweight self-installation structure according to claim 1 or 2, characterized in that: The reversing pulley block (5) is connected to a side of the boom (1) close to the turntable (3).

6. The crane counterweight self-installation structure according to claim 1, characterized in that: The terminal end of the connecting member (4) is detachably connected to the bottom plate of the turntable (3).

7. The crane counterweight self-installation structure according to claim 1, characterized in that: The connecting piece (4) is a flexible connecting piece.

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