Amplitude variation system with novel structure

Abstract

The utility model discloses a luffing system with a novel structure, which is characterized in that a support frame for a luffing pulley block for heightening is arranged on a propeller strut, a connecting pull plate is arranged between the propeller strut and a lower luffing pulley block, and the support frame is connected with the propeller strut and the connecting pull plate through a luffing rope. According to the utility model, the tension arm of a tension part of the luffing system can be increased, the weight and the cost are optimized, the axial force of the main arm is reduced, and the crane performance is improved.

Description

Technical Field

[0001] The utility model relates to the field of cranes, in particular to a new-structure luffing system. Background Art

[0002] The realization of the luffing of the crane boom requires the close cooperation of various components of the luffing system, including cables / pull plates, luffing pulley blocks, herringbone frames, wire ropes, etc. There are many specific forms of luffing systems, among which a common form for small tonnage cranes is the form of cables (pull plates), luffing pulley blocks, and herringbone frames. The triangle formed by the herringbone frame, luffing pulley block + luffing rope + cables (pull plates) and main boom is the most important force triangle relationship of the crane. The higher the herringbone frame, the greater the force arm of the tension component of the luffing system, the smaller the force, and the smaller the axial force of the main boom. However, due to the requirements of transportation economy and operational convenience, crane transportation often requires saving transportation vehicles. The main machine is often transported with the herringbone frame and the bottom section of the main boom. At this time, the herringbone frame needs to be laid flat, and the transportation length of the main machine is limited. Therefore, the height size of the herringbone frame is limited, which affects the force matching of the crane.

[0003] Therefore, it is necessary to develop a new structural luffing system in a targeted manner to optimize its weight and cost, while reducing the axial force of the main arm to improve crane performance. Utility Model Content

[0004] Purpose of the utility model: In view of the shortcomings and defects of the prior art, the utility model provides a new structure of the luffing system, which can increase the lever arm of the tension component of the luffing system, optimize its weight and cost, and reduce the axial force of the main arm, thereby improving the performance of the crane.

[0005] Technical solution: The utility model is a new structure luffing system, characterized in that: a support frame for increasing the height of the luffing pulley block is arranged on the herringbone frame, a connecting pull plate is arranged between the herringbone frame and the lower luffing pulley block, and the support frame is connected to the herringbone frame and the connecting pull plate through a luffing rope.

[0006] Wherein, the luffing rope passes through the luffing winch and passes through the first guide wheel and the second guide wheel in sequence.

[0007] Wherein, the first guide wheel is installed on the herringbone frame, and the second guide wheel is installed on the lower luffing pulley block.

[0008] Wherein, the lower luffing pulley block is connected to the upper luffing pulley block through the luffing steel wire rope, and the upper luffing pulley block is connected to the crane main arm through the pull plate.

[0009] Wherein, the connecting pull plate is a pull plate or a pull cable structure.

[0010] Wherein, the pull plate is a pull plate or a pull cable structure.

[0011] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: the herringbone frame and the lower luffing pulley block of the utility model are connected by a pull plate and a supporting structure, the pull plate connects the hinge point of the luffing pulley block and the herringbone frame pulley shaft, and a support structure hinge point is set, one end of the support structure is hinged on the front support rod of the herringbone frame, and the other end is connected to the pull plate. The arm of the tension component of the luffing system can be increased, its weight and cost can be optimized, and the axial force of the main arm can be reduced, thereby improving the performance of the crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the prior art amplitude variable system;

[0013] Figure 2 This is a structural schematic diagram of the variable amplitude system of the utility model;

[0014] Figure 3 It is a structural schematic diagram of the support frame and the connecting pull plate of the utility model;

[0015] Figure 4 This is a schematic diagram of the connection structure between the first guide wheel and the second guide wheel of the utility model;

[0016] Figure 5 This is a schematic structural diagram of the second guide wheel of the utility model;

[0017] In the figure, 1 is a herringbone frame; 2 is a lower luffing pulley block; 3 is a luffing wire rope; 4 is an upper luffing pulley block; 5 is a pull plate; 6 is the main arm of the crane; 7 is a supporting frame; 8 is a connecting pull plate; 9 is a luffing rope; 10 is a first guide wheel; 11 is a second guide wheel; and 12 is a luffing winch. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0019] The new structure luffing system of the utility model is provided with a support frame 7 for increasing the height of the luffing pulley block on the herringbone frame 1, a connecting pull plate 8 is provided between the herringbone frame 1 and the lower luffing pulley block 2, and the support frame 7 is connected with the herringbone frame 1 and the connecting pull plate 8 through a luffing rope 9. The luffing rope 9 passes through the luffing winch 12, and passes through the first guide wheel 10 and the second guide wheel 11 in sequence. The first guide wheel 10 is installed on the herringbone frame 1, and the second guide wheel 11 is installed on the lower luffing pulley block 2. The lower luffing pulley block 2 is connected to the upper luffing pulley block 4 through the luffing steel wire rope 3, and the upper luffing pulley block 4 is connected to the crane main arm 6 through the pull plate 5. The connecting pull plate 8 is a pull plate or a cable structure. The pull plate 5 is a pull plate or a cable structure.

[0020] The utility model increases the arm of the tension component of the variable-length system by adding a support structure of the variable-length pulley block to the herringbone frame 1. The details are as follows: a support structure (support frame 7) is set on the herringbone frame 1, and the connecting plate 8 between the herringbone frame 1 and the lower variable-length pulley block 2 is lengthened. When working, it is only necessary to connect the support structure with the herringbone frame 1 and the mounting holes on the connecting plate 8 to increase the working height of the variable-length pulley block and increase the arm of the tension component of the variable-length system. The use of this structure requires the addition of a variable-length steel wire rope guide pulley. Specifically, the variable-length rope 9 is drawn out from the variable-length winch 12, and the steel wire rope is passed through the first guide pulley 10 of the herringbone frame rope and the second guide pulley 11 on the lower variable-length pulley block 2.

[0021] The utility model can realize the increase of the lever arm of the tension component of the luffing system, thereby increasing the lifting capacity of the crawler crane; there is no need to change the transport mode of the crawler crane, and the original transport economy and disassembly convenience are maintained.

Claims

1. A new structure luffing system, characterized by: A support frame (7) for increasing the height of a luffing pulley block is arranged on the herringbone frame (1); a connecting pull plate (8) is arranged between the herringbone frame (1) and the lower luffing pulley block (2); and the support frame (7), the herringbone frame (1) and the connecting pull plate (8) are connected via a luffing rope (9).

2. The new structure luffing system according to claim 1 is characterized by: The luffing rope (9) passes through the luffing winch (12) and passes through the first guide wheel (10) and the second guide wheel (11) in sequence.

3. The new structure luffing system according to claim 2 is characterized by: The first guide wheel (10) is installed on the herringbone frame (1), and the second guide wheel (11) is installed on the lower luffing pulley block (2).

4. The new structure luffing system according to claim 1 is characterized by: The lower luffing pulley block (2) is connected to the upper luffing pulley block (4) via a luffing steel wire rope (3), and the upper luffing pulley block (4) is connected to the crane main arm (6) via a pull plate (5).

5. The new structure luffing system according to claim 1 is characterized by: The connecting pull plate (8) is a pull plate or a pull cable structure.

6. The new structure luffing system according to claim 4 is characterized by: The pull plate (5) is a pull plate or a pull cable structure.

Images