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Pulley block lifting device with multiple distance increase and speed increase and realization method of pulley block lifting device

An implementation method and pulley block technology, applied in the directions of portable hoisting devices, hoisting devices, etc., can solve the problems of large frictional resistance of pulleys and wire ropes, low overall mechanism efficiency, large power loss, etc., to ensure stress, reduce superposition effect, Reduce the effect of intermediate docking

Inactive Publication Date: 2018-09-25
林若波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional range-extending speed-increasing lifting device adopts a combination system of multiple movable and fixed pulleys, which has problems such as large volume and weight of the pulleys, and large frictional resistance between the pulleys and wire ropes, resulting in low efficiency of the overall mechanism and large power loss.

Method used

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  • Pulley block lifting device with multiple distance increase and speed increase and realization method of pulley block lifting device
  • Pulley block lifting device with multiple distance increase and speed increase and realization method of pulley block lifting device
  • Pulley block lifting device with multiple distance increase and speed increase and realization method of pulley block lifting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1: Implementation method of multi-fold range-extending speed-up

[0049] Figure 4 It is a simplified diagram of the system structure of the pulley block device. The steel wire rope 6 is wound in the pulley block (large pulley 3, semi-moving pulley block 4, semi-fixed pulley block 5) structure device respectively as 601, 602, 603, 604, and the winding between the pulley blocks There are 4 steel wire ropes, and these 4 steel wire ropes change with the expansion and contraction of the piston rod of the oil cylinder. The displacement changes of these 4 steel wire ropes are consistent with the telescopic displacement changes of the piston rod.

[0050] Figure 5 It is a schematic diagram of a 4-fold range-extending speed-increasing pulley block lifting device. When the telescopic piston rod 801 of the oil cylinder moves, the distance between the moving pulley block moving from position B to position A is S1, and the distance between the moving pulley block moving f...

Embodiment 2

[0053] Embodiment 2: Realization method of reducing friction superposition effect

[0054] Figure 6 It is the force analysis diagram of the pulley block hoisting device. The steel wire rope 6 in the entire pulley block mechanism, due to the device structure and the winding mode of the steel wire rope, causes the steel wire rope and all the pulleys to contact and friction, resulting in friction. The friction force of all pulleys Superposition will not only increase the load force of the drive and affect the efficiency of the entire mechanism, but also accelerate the wear of the wire rope and pulley, affecting the life of the wire rope and pulley.

[0055] Point A is the force bearing point of the cylinder piston rod and the pulley block. The maximum force bearing points between the wire rope and the pulley are four points B, C, D, and E respectively, and the corresponding positive pressures are F, F3, F4, and F5 respectively. The friction forces are f0, f1, f2, f3 respectivel...

Embodiment 3

[0068] Embodiment 3: Implementation method for reducing the influence of lateral friction force

[0069] Figure 7 It is the wire rope winding and force diagram of the (partial) pulley block lifting device. The steel wire rope 6 is wound between the large movable pulley 3, the semi-movable pulley block 4 and the semi-fixed pulley block 5 in sequence, and the steel wire ropes between the pulleys are respectively 601, 602, 603, 604. Because of the structural design of the pulley block, there is a certain positional relationship between the pulleys, so the steel wires are wound between the pulleys, and there are certain positions between the steel wire ropes 601, 602, 603, 604 between the semi-moving pulley block 4 and the semi-fixed pulley block 5. The included angle α, so the pulley not only has a vertical pulling force N1, but also a horizontal radial force N2, the size of N1 and N2 is affected by the size of the included angle α, N1, N2 and F1, F2 and the included angle The...

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Abstract

The invention discloses a pulley block lifting device with multiple distance increase and speed increase and a realization method of the pulley block lifting device. The device comprises a balanced pulley block, a steering pulley block, a movable pulley block, a fixed pulley block, steel wire ropes, a rack, a lifting oil cylinder and a control system; a multi-rate structure is formed by a movablepulley, a half-movable pulley block and a half-fixed pulley block by adopting a combined driving mode of the lifting oil cylinder, the pulley blocks and the steel wire rope and combined driving of themovable pulley block, the fixed pulley block, the steering pulley block and the balanced pulley block; a multiple distance increase and speed increase structure is realized by winding and reversing of the steel wire rope among the movable pulley, the half-movable pulley block and the half-fixed pulley block; by optimizing an included angle between the fixed pulley block and the steel wire rope, afriction force superposing effect can be effectively reduced, and time-saving operation is realized; due to the adoption of an integral compact design form, included angles between the steel wire ropes between the movable pulley block and the fixed pulley block are reduced, lateral friction force is reduced and efficient lifting efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of a pulley block hoisting device, in particular to a pulley block lifting device with multi-fold range-increasing speed-up and its implementation method. Background technique [0002] The traditional range-extending speed-increasing lifting device adopts a combination system of multiple movable and fixed pulleys, which has problems such as large volume and weight of the pulleys, and large frictional resistance between the pulleys and wire ropes, resulting in low efficiency of the overall mechanism and large power loss. In order to further improve efficiency, reduce lifting resistance, reduce power loss, efficiently and quickly realize range increase and speed up, and increase efficiency steadily, the present invention provides a new control device, which adopts a combined transmission mode of lifting cylinder, pulley block and steel wire rope, through the cylinder The expansion and contraction of the piston...

Claims

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Application Information

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IPC IPC(8): B66D3/06B66D3/08
CPCB66D3/06B66D3/08
Inventor 林若波王嘉仪林仪婷王梓跃
Owner 林若波