Short connecting structure of superlift variable-amplitude pulley block

Abstract

The utility model discloses a short connecting structure of a superlift luffing pulley block, which is characterized in that a connecting plate between a superlift upper luffing pulley block and a superlift lower luffing pulley block is a short connecting plate with a short U-shaped structure, the end part of the short connecting plate of the superlift lower luffing pulley block is provided with a short U-shaped groove, and the upper part and the lower part of the short U-shaped groove are respectively provided with an overhanging structure; the short U-shaped groove is matched with a positioning shaft rod of the superlift upper variable-amplitude pulley block to position the front-back position and the up-down position after the two pulley blocks are assembled and guide the two pulley blocks up and down when the two pulley blocks enter the groove, and the upper and lower extending structures are matched with a limiting pin shaft of the superlift upper variable-amplitude pulley block to limit rotation around the center line of the positioning shaft rod after the two pulley blocks are assembled. According to the utility model, through the structural form of short connection between the upper and lower variable-amplitude pulley blocks, the rigidity and reliability of the connecting structure can be effectively improved, the utilization rate of plate raw materials is improved, the manufacturing cost is reduced, and the surface of a structural part is simple and attractive.

Description

Technical Field

[0001] The utility model relates to the technical field of super-lifting and luffing of crawler cranes, in particular to a short connection structure of a super-lifting and luffing pulley block. Background Art

[0002] In recent years, as crawler crane technology has become increasingly mature, the market demand for crawler cranes has tended to be stronger overall performance, more versatile, easier to disassemble and assemble, and more efficient in construction. In order to meet market demand, various main engine manufacturers have accelerated their research and development, continuously bringing forth new ideas, and while ensuring the hoisting performance of crawler cranes, they have paid more attention to the humanization, convenience, and efficient disassembly and assembly during use. The integrated transportation of crawler crane superlifting and luffing systems is one of the directions. The superlifting and luffing system mainly includes superlifting masts, superlifting and luffing winches, superlifting and luffing wire ropes, and superlifting and luffing pulley blocks.

[0003] In order to realize the integrated transportation of the superlift luffing system, it is usually necessary to design the upper and lower luffing pulley blocks of the superlift as an independent component (before this, the lower luffing pulley block of the superlift is placed on the top arm of the superlift mast). The two are connected and fixed by a long connecting plate and a pin shaft to realize the assembly and fixation of the two in the transportation state. During operation, the super-lifting lower luffing pulley block is connected to the super-lifting mast top boom through a hanging plate and a pin shaft, and the super-lifting upper luffing pulley block is connected to the main boom rear pull plate through a pin shaft. The two are connected through the super-lifting luffing wire rope to achieve the main boom luffing; similar to the luffing principle of the main boom, the super-lifting upper and lower luffing pulley blocks can be assembled and separated by retracting and releasing the super-lifting luffing wire rope; after the super-lifting luffing pulley block is assembled, the super-lifting luffing pulley block is hoisted together with the super-lifting luffing wire rope and installed to the super-lifting mast bottom boom, so as to realize the integrated transportation function of the super-lifting luffing system (super-lifting mast bottom boom, super-lifting luffing winch, super-lifting luffing wire rope, super-lifting luffing pulley block). This function can realize the non-disassembly and system-integrated transportation of the super-lifting luffing wire rope, and improve the convenience and efficiency of disassembly and assembly.

[0004] During assembly, the positioning shaft rod and the limiting shaft rod of the upper luffing pulley group are inserted into the long U-shaped groove of the long connecting plate of the lower luffing pulley group; the positioning shaft rod realizes the positioning of the two in the length direction, the limiting shaft rod can limit the rotation of the two relative to the axis direction of the positioning shaft rod, and the limiting plate group limits the movement of the two in the width direction and plays a guiding role in the assembly process; finally, the limiting pin shaft is installed to ensure that the two are not separated during lifting. Since the limiting shaft is far away from the positioning shaft and the long connecting plate is long, the long connecting plate is required to have good rigidity; however, the long U-shaped structure of the long connecting plate determines that the rigidity and reliability of this part are poor, which is easy to cause damage during the lifting and super-lifting mast lifting process after assembly; especially in the stage when the arm head just leaves the ground during the super-lifting mast lifting process, due to the tightening and winding of the super-lifting luffing wire rope, the super-lifting upper and lower luffing pulley blocks cannot be completely separated from the long U-shaped structure of the long connecting plate (limiting the rotation of the two around the center line of the limiting shaft), which easily causes the long connecting plate to bend and deform due to excessive force during the process of the super-lifting luffing pulley block being dragged by the super-lifting mast. Through practice, it is found that the long connecting plate and pin shaft connection method between the upper and lower luffing pulley blocks of the super-lifting have problems such as insufficient rigidity, poor reliability, low raw material utilization, messy surface of structural parts, and high manufacturing cost.

[0005] Therefore, it is necessary to develop a new type of short connection structure of the super-lifting variable-length pulley group in a targeted manner to improve the stiffness and reliability of the connection structure, increase the utilization rate of plate raw materials, reduce manufacturing costs, and make the surface of the structural parts simple and beautiful. Utility Model Content

[0006] Purpose of the utility model: In view of the shortcomings and defects of the prior art, the utility model provides a short connection structure of a super-lifting variable-length pulley group. Through the short connection structure between the super-lifting upper and lower variable-length pulley groups, the rigidity and reliability of the connection structure can be effectively improved, the utilization rate of the plate raw materials can be improved, the manufacturing cost can be reduced, and the surface of the structural parts can be made simple and beautiful.

[0007] Technical solution: The utility model is a short connection structure of a super-lifting variable-length pulley group, which is characterized in that: the connecting plate between the super-lifting upper variable-length pulley group and the super-lifting lower variable-length pulley group is set as a short connecting plate of a short U-shaped structure, and the short connecting plate end of the super-lifting lower variable-length pulley group is provided with a short U-shaped groove, and the short U-shaped groove has an overhanging structure above and below. The short U-shaped groove cooperates with the positioning shaft rod of the super-lifting upper variable-length pulley group to position the two pulley groups front and back and up and down after assembly, and to guide them up and down when entering the groove. The upper and lower overhanging structures cooperate with the limit pin shaft of the super-lifting upper variable-length pulley group to limit the rotation around the center line of the positioning shaft rod after the two pulley groups are assembled.

[0008] Wherein, the short connecting plate is an independent plate arranged on the outer side of the main plate outside the super lifting lower variable-length pulley group.

[0009] Wherein, the short connecting plate is an extension structure of the outer main plate of the super lifting lower luffing pulley group.

[0010] Among them, the positioning shaft rod of the super-lifting upper variable-length pulley group is located on the middle surface of the end in the up-down direction, and the limit plate groups at both ends are used to limit the width position of the two pulley groups and guide in the width direction during assembly.

[0011] Wherein, the limiting plate group has a group of pin holes on the upper and lower parts respectively for installing the limiting pins.

[0012] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: the utility model is applied to the super-lifting luffing system of the crawler crane in the super-lifting working condition, and realizes the short connection between the super-lifting (upper and lower) luffing pulley blocks in the transportation state through the short connecting plate of the super-lifting lower luffing pulley block, the positioning shaft rod of the super-lifting upper luffing pulley block, the limit plate group and the limit pin shaft. The utility model can improve the reliability of the connection structure between the super-lifting (upper and lower) luffing pulley blocks in the transportation state, and at the same time simplify the connection structure on the super-lifting (upper and lower) luffing pulley blocks, improve the utilization rate of the plate and reduce the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the long connecting plate and pin connection method between the upper and lower luffing pulley blocks of the super lifting in the prior art;

[0014] Figure 2 It is a structural schematic diagram of the utility model;

[0015] Figure 3 It is a side view structural schematic diagram of the utility model;

[0016] Figure 4 It is a schematic diagram of the top view structure of the utility model;

[0017] Figure 5 This is a schematic diagram of the assembly structure of the utility model;

[0018] In the figure, 1 is the upper luffing pulley group of the superlift; 2 is the lower luffing pulley group of the superlift; 3 is the positioning shaft rod; 4 is the limit plate group; 5 is the limit pin shaft; and 6 is the short connecting plate. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0020] The crawler crane of the utility model refers to a mobile crane that installs lifting parts and mechanisms on a crawler chassis and moves by means of a crawler device. The super-lifting and luffing system refers to another main luffing system used for crawler cranes in super-lifting conditions to cooperate with the main luffing to achieve changes in the lifting radius, and is mainly composed of a super-lifting mast, a super-lifting and luffing winch, a super-lifting and luffing pulley block and a wire rope. The super-lifting mast refers to the main component of the super-lifting and luffing system, which is generally a truss structure. The super-lifting and luffing pulley block refers to the main component of the super-lifting and luffing system, which is composed of structural parts and a number of pulleys; it is now mostly divided into two parts: the super-lifting upper and lower luffing pulley blocks. When working, the one close to the main arm is the super-lifting upper luffing pulley block, and the one close to the super-lifting mast is the super-lifting lower luffing pulley block, and the two are connected by a wire rope.

[0021] The short connection structure of the super-lifting luffing pulley block of the utility model sets the connection plate between the super-lifting upper luffing pulley block 1 and the super-lifting lower luffing pulley block 2 as a short connecting plate 6 of a short U-shaped structure, and the end of the short connecting plate 6 of the super-lifting lower luffing pulley block 2 is provided with a short U-shaped groove, and the short U-shaped groove has an overhanging structure above and below. The short U-shaped groove cooperates with the positioning shaft rod 3 of the super-lifting upper luffing pulley block 1 to position the two pulley blocks in the front and back and up and down positions after assembly, and guide them up and down when entering the groove, and the upper and lower overhanging structures cooperate with the limit pin shaft 5 of the super-lifting upper luffing pulley block 1 to limit the rotation around the center line of the positioning shaft rod after the two pulley blocks are assembled.

[0022] Among them, the short connecting plate 6 is an independent plate member arranged on the outer side of the main outer plate of the super-lifting lower luffing pulley block 2. Alternatively, the short connecting plate 6 is an extension structure of the main outer plate of the super-lifting lower luffing pulley block 2. The positioning shaft rod 3 of the super-lifting upper luffing pulley block 1 is located on the middle surface of the end in the up-down direction, and the limit plate groups 4 at both ends are used to limit the width position of the two pulley blocks and guide in the width direction during assembly. The limit plate group 4 has a group of pin holes on the upper and lower sides for installing the limit pins 5. Through the above structures and parts, the upper and lower luffing pulley blocks of the super-lifting can be assembled with the positioning shaft rod of the upper luffing pulley block of the super-lifting as the reference, as well as hoisted and transported as a whole, meeting the needs of integrated transportation of the super-lifting luffing system of the crawler crane.

[0023] like Figure 5 The utility model improves the structural rigidity and enhances the reliability: the utility model designs the connecting plate between the upper and lower variable-length pulley groups of the superlift into a short U-shaped structure, so that the force arm that limits the rotation around the positioning shaft is shortened, thereby enhancing the rigidity of the short connecting plate; at the same time, when the superlift mast is raised, the two can be effectively separated (rotatable around the center line of the positioning shaft), and no longer bear a large drag torque, thereby improving the force and enhancing the reliability.

[0024] The utility model makes the surface of the structural parts neat and beautiful: the invention simplifies and integrates the limit plate group on the surface of the super lifting upper variable amplitude pulley group structural parts, making the surface of the structural parts neater and more beautiful. Improve the utilization rate of the plate and reduce the cost: the short connecting plate short U-shaped structure of the invention can significantly improve the utilization rate of the plate, reduce the number of rib plates, limit plate groups, and limit shaft rods, and can reduce the difficulty and cost of production.

Claims

1. A short connection structure of a superlifting luffing pulley block, characterized in that: The connecting plate between the super-lifting upper luffing pulley block (1) and the super-lifting lower luffing pulley block (2) is set as a short connecting plate (6) of a short U-shaped structure, and the end of the short connecting plate (6) of the super-lifting lower luffing pulley block (2) is provided with a short U-shaped groove, and the short U-shaped groove has an overhanging structure at the top and bottom. The short U-shaped groove cooperates with the positioning shaft rod (3) of the super-lifting upper luffing pulley block (1) to position the two pulley blocks in front and back and up and down positions after assembly, and guide them up and down when entering the groove, and the upper and lower overhanging structures cooperate with the limiting pin shaft (5) of the super-lifting upper luffing pulley block (1) to limit the rotation around the center line of the positioning shaft rod after the two pulley blocks are assembled.

2. The short connection structure of the superlifting luffing pulley block according to claim 1 is characterized in that: The short connecting plate (6) is an independent plate member arranged on the outer side of the outer main plate of the super lifting lower luffing pulley block (2).

3. The short connection structure of the superlifting luffing pulley block according to claim 1 is characterized in that: The short connecting plate (6) is an extension structure of the outer main plate of the super lifting lower luffing pulley block (2).

4. The short connection structure of the superlifting luffing pulley block according to claim 1 is characterized in that: The positioning shaft rod (3) of the super-lifting upper variable-length pulley block (1) is located on the middle surface of the end in the up-down direction, and the limit plate blocks (4) at both ends are used to limit the width position of the two pulley blocks and guide them in the width direction during assembly.

5. The short connection structure of the superlifting luffing pulley block according to claim 4 is characterized in that: The limit plate group (4) has a group of pin holes at the top and bottom for installing the limit pins (5).

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