Arm head structure of fly jib and crawler crane thereof

Abstract

The utility model discloses an arm head structure of an auxiliary arm, which comprises an auxiliary arm top section arm, the auxiliary arm top section arm is connected with an arm head large pulley block or an arm head small pulley block, and the auxiliary arm top section arm is connected with the arm head large pulley block through hinge pin clips of four hinge points C, D, E and F; the top section arm of the fly jib is connected with the two arm head small pulley blocks through pin shaft clips of four hinge points A, B, G and H; the arm head small pulley block comprises an arm head small pulley yoke and a pulley. According to the crawler crane disclosed by the utility model, under the condition that the section size of the top section arm of the fly jib is fixed, a plurality of hinge point holes are additionally formed in the spaces on the two sides of the top section arm of the fly jib, so that small jib head pulley blocks on the two sides can be mounted on the top section arm, and the multiplying power of the jib head pulley blocks of the fly jib is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of super-lifting and luffing of crawler cranes, in particular to a jib arm head structure and a crawler crane thereof. Background Art

[0002] Crawler crane refers to a type of mobile crane, which is a truss-type boom structure crane with the lifting part installed on a crawler chassis and moving on a crawler device. The main boom is one of the important components of a crawler crane. The boom can lift the cargo to a certain lifting height, and changing the working elevation angle of the boom can achieve the purpose of variable amplitude to increase the operating range. The auxiliary arm is connected to the end of the main arm to increase the length of the boom and assist in lifting.

[0003] In order to meet the demand for lifting large equipment in large-scale domestic projects such as petroleum, petrochemical, nuclear power, wind power, and steel, cranes are increasingly developing towards super-large sizes, with higher lifting heights, larger working ranges, and stronger lifting capacities. Among various types of cranes, crawler cranes have become an indispensable tool for the installation of large equipment due to their precision in lifting and moving. With the development of large-scale cranes, a series of problems in the design, production, transportation, installation, and use processes have seriously restricted the development of crawler cranes.

[0004] As the lifting capacity of crawler cranes becomes stronger and stronger, the boom length becomes longer and longer, and there are more and more boom combination forms. In addition to the main boom working condition, the main boom plus the auxiliary boom is another boom combination form. The main and auxiliary boom working conditions solve the needs of crawler cranes for longer boom length and greater lifting capacity. Therefore, improving the carrying capacity of the auxiliary boom is one of the development directions of super-large tonnage crawler cranes.

[0005] The conventional structure of the jib boom head of the main and auxiliary jib working conditions of the crawler crane in the prior art consists of: the jib top section arm and the arm head pulley block. There are four hinge points a, b, c and d on the jib top section arm, and the jib top section and the arm head pulley block are connected by the pin shaft clips of the four hinge points a, b, c and d. When the existing crawler crane increases the lifting capacity of the jib, it is necessary to redesign a new jib top section arm, and by increasing the cross-sectional size of the jib top section arm, it is necessary to install two arm head pulley blocks. For the whole vehicle, two tower arm top sections and two large arm head pulley blocks are required. The main and auxiliary jib working conditions for lifting the lifting capacity consist of: the jib top section arm for lifting the lifting capacity, the arm head pulley block (two), and the jib top section arm 3 arm head pulley blocks (two) are connected by the pin shaft clips of the eight hinge points e, f, g, h, i, j, k and l.

[0006] When the cross-sectional dimensions of the top section of the jib of a crawler crane are certain, the installation dimension range of the boom head pulley block installed on the top section of the jib is also determined. When the market requirements for the lifting capacity of the existing crawler crane jib increase, it is necessary to add an additional pulley block to achieve the increase in the lifting capacity of the jib. The installation of the double boom head pulley block is limited by the cross-sectional dimensions of the top section of the jib. If the installation of the double boom head pulley block is to be achieved, a jib top section needs to be redesigned. For the crawler crane vehicle, two sets of jib top sections and double boom head pulley blocks are required, resulting in an increase in the cost of the vehicle. For different jib lifting capacities, different jib top sections and boom head pulley blocks need to be switched, resulting in poor disassembly and assembly convenience of the vehicle and increased disassembly and assembly costs. The larger the tonnage of the crawler crane, the more the cost of the vehicle increases. Therefore, it is urgent to solve such problems in order to increase the lifting capacity of the crawler crane's jib. Utility Model Content

[0007] Purpose of the utility model: In view of the shortcomings and defects of the prior art, the utility model provides a jib boom head structure and a crawler crane thereof. When the cross-sectional size of the top section of the jib of the crawler crane is certain, several hinge point holes are added to the space on both sides of the top section of the jib, and small pulley blocks on both sides of the boom head can be installed on the top section of the jib, thereby increasing the multiplier of the jib boom head pulley block.

[0008] Technical solution: The utility model is a jib arm head structure, characterized in that: it includes a jib top section arm, the jib top section arm is connected to the arm head large pulley group or the arm head small pulley group, the jib top section arm and the arm head large pulley group are connected by pins at four hinge points C, D, E, and F, the jib top section arm is connected to two arm head small pulley groups by pins at four hinge points A, B, G, and H; the arm head small pulley group includes an arm head small pulley frame and a pulley.

[0009] Wherein, the two sides of the auxiliary arm top section arm are respectively connected to the arm head small pulley block.

[0010] Among them, when the auxiliary arm top section arm is connected with the arm head large pulley block, the pin shaft clip is inserted into the four hinge points C, D, E, and F for positioning.

[0011] Wherein, when the auxiliary arm top section arm is connected with two arm head small pulley blocks, the pin shaft clip is inserted into the four hinge points A, B, G and H for positioning.

[0012] A crawler crane is provided with a jib boom head structure.

[0013] Beneficial effect: Compared with the prior art, the utility model has the following significant advantages: The utility model provides a new type of jib boom head structure, and when the cross-sectional size of the top section of the jib of the crawler crane is certain, by adding several hinge point holes on both sides of the space on the top section of the jib, small pulley blocks on both sides of the boom head can be installed on the top section of the boom, thereby increasing the multiplier of the jib boom head pulley block, thereby improving the jib lifting capacity of the existing crawler crane, and at the same time does not affect the use requirements of the original jib lifting capacity. Customers can assemble the type and quantity of boom head pulley blocks according to the lifting capacity requirements.

[0014] One jib top section can simultaneously meet the requirements of installing two jib lifting weights and multiple jib lifting weights. For the whole vehicle, one jib top section is reduced, and two jib pulley blocks are used to replace a large jib pulley block, which greatly reduces the cost of the whole vehicle, and also improves the convenience of disassembly and assembly of the whole vehicle, reducing the disassembly and assembly cost. The new structure of the jib jib head better meets the current market demand for the development of ultra-large tonnage crawler cranes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the working structure of the main and auxiliary arms of a crawler crane in the prior art;

[0016] Figure 2 It is a schematic diagram of the main and auxiliary arm working conditions of the crawler crane in the prior art for lifting the load;

[0017] Figure 3 It is a schematic diagram of the structure of the utility model;

[0018] Figure 4 It is a partial structural schematic diagram of detail I of the utility model;

[0019] In the figure, 1 is the top section of the auxiliary arm; 2 is the large pulley block at the arm head; 3 is the small pulley block at the arm head; 4 is the small pulley frame at the arm head; and 5 is the pulley. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0021] The auxiliary arm arm head structure of the utility model comprises an auxiliary arm top section arm 1, which is connected to a large pulley block 2 of the arm head or a small pulley block 3 of the arm head. The auxiliary arm top section arm 1 is connected to the large pulley block 2 of the arm head through pins at four hinge points C, D, E and F. The auxiliary arm top section arm 1 is connected to two small pulley blocks 3 of the arm head through pins at four hinge points A, B, G and H. The small pulley block 3 of the arm head comprises a small pulley frame 4 of the arm head and a pulley 5.

[0022] Among them, both sides of the jib top section arm 1 are connected to the arm head small pulley block 3 respectively. When the jib top section arm 1 is connected to the arm head large pulley block 2, the pin shaft clip is inserted into the four hinge points C, D, E, and F for positioning. When the jib top section arm 1 is connected to the two arm head small pulley blocks 3, the pin shaft clip is inserted into the four hinge points A, B, G, and H for positioning.

[0023] The utility model arranges several hinge holes on both sides of the original boom pulley block for installing the jib pulley blocks on both sides, thereby increasing the multiple of the boom pulley block, improving the jib lifting capacity of the existing crawler crane, and does not affect the original jib lifting capacity requirements, and the installation hinge point size of the original boom pulley block and the jib top section arm is not affected. Customers assemble the type and quantity of boom pulley blocks according to their needs. The new structure of the jib boom head better meets the current market demand for the use of super-large tonnage crawler cranes.

Claims

1. A jib head structure, characterized in that: The utility model comprises a jib top section arm (1), the jib top section arm (1) is connected to a large pulley block (2) at the arm head or a small pulley block (3) at the arm head, the jib top section arm (1) is connected to the large pulley block (2) at the arm head via pins at four hinge points C, D, E and F, and the jib top section arm (1) is connected to two small pulley blocks (3) at the arm head via pins at four hinge points A, B, G and H; the small pulley block (3) at the arm head comprises a small pulley frame (4) at the arm head and a pulley (5).

2. The auxiliary arm head structure according to claim 1, characterized in that: Both sides of the auxiliary arm top section arm (1) are respectively connected to the arm head small pulley block (3).

3. The auxiliary arm head structure according to claim 1, characterized in that: When the auxiliary arm top section arm (1) is connected to the arm head large pulley block (2), the pin shaft clip is inserted into the four hinge points C, D, E and F for positioning.

4. The auxiliary arm head structure according to claim 1, characterized in that: When the auxiliary arm top section arm (1) is connected with two arm head small pulley blocks (3), the pin shaft clip is inserted into the four hinge points A, B, G and H for positioning.

5. A crane, characterized in that: A jib head structure according to any one of claims 1 to 4 is provided.

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