Closed hydraulic circuit of hoisting winding engine

A hydraulic oil circuit, machine-closed technology, applied in the field of hydraulic oil circuit, can solve the problems of affecting the descending speed of the hoist and high oil temperature in the small cycle

Inactive Publication Date: 2010-10-06
CHINA FIRST METALLURGICAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control the descending speed smoothly, the same method as the open system can be used, adding a balance valve or other forms of throttling to control the descending speed on the high pressure side, but this will generate a lot of heat energy, which will make the internal oil temperature of the small cycle too high. high
The reverse torque characteristic of the diesel engine can also be used to limit the descending speed. Once the reverse torque is exceeded, the diesel engine will run out of control and overspeed. If the displacement of the two-way hydraulic pump is reduced, the driving torque of the hydraulic pump will be reduced, which may affect the winch. The rate of decline

Method used

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  • Closed hydraulic circuit of hoisting winding engine
  • Closed hydraulic circuit of hoisting winding engine
  • Closed hydraulic circuit of hoisting winding engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the brake hydraulic pump 5 is a quantitative hydraulic pump, and the overflow valve 6 is an electro-hydraulic proportional overflow valve. The overflow pressure is proportional to the current input to the pressure control terminal of the electro-hydraulic proportional overflow valve. The oil discharge port of the brake hydraulic pump 5 is connected to the hydraulic oil tank 9 through the relief valve 6 , and the pressure control terminal of the relief valve 6 is connected with the output terminal of the control unit 8 . The control unit 8 outputs instructions to the relief valve 6 according to the actual speed of the diesel engine 1 and the overspeed increment of the speed set by the speed controller 7 . When the control unit 8 detects that the actual rotational speed of the diesel engine 1 exceeds the preset rotational speed, and an overspeed increment occurs, the control unit 8 outputs current to the electro-hydraulic proportional overflow v...

Embodiment 2

[0020] Such as figure 2 As shown, the brake hydraulic pump 5 adopts an electronically controlled proportional variable hydraulic pump 11 , and the control terminal of the electronically controlled proportional variable hydraulic pump 11 is electrically connected to the output port of the control unit 8 . The relief valve 6 adopts a common relief valve 12 with an unloading function. The displacement of the electronically controlled proportional variable hydraulic pump 11 is proportional to the current input to its control terminal; the control terminal of the electronically controlled proportional variable hydraulic pump 11 is connected to the output port of the control unit 8 . When the control unit 8 detects that the actual speed of the diesel engine 1 exceeds the set speed and an overspeed increment occurs, the control unit 8 outputs an instruction to the unloading overflow valve 12 to make the unloading overflow valve 12 reach the set pressure; At the same time, the contr...

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PUM

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Abstract

The invention relates to a closed hydraulic circuit of a hoisting winding engine. In the invention, a braking hydraulic pump is additionally arranged on the mechanical connection link of a diesel engine and a two-way hydraulic pump; the main shaft of the braking hydraulic pump, the main shaft of the two-way hydraulic pump and the main shaft of the diesel engine are connected in a mechanical transmission mode; the oil inlet of the braking hydraulic pump is connected with the oil outlet of a hydraulic oil tank so as to pump hydraulic oil from the hydraulic oil tank; and the oil extraction of the braking hydraulic pump is connected to the hydraulic oil tank through an overflow valve. By measuring the revolution increment of the diesel engine dragged by the driving torque of the two-way hydraulic pump and controlling the throttling actions of the braking hydraulic pump and the overflow valve, the invention ensures that the driven torque produced by the braking hydraulic pump is balanced with the driving torque produced by the two-way hydraulic pump, stabilizes the incontrollable overspeeding of the hoisting winding engine in the descending process and has a certain energy conservation effect.

Description

technical field [0001] The invention relates to a hydraulic oil circuit for lifting the hook of a fully hydraulic crane and controlling the speed of a luffing winch for a boom using a closed transmission hydraulic oil circuit. Background technique [0002] When the full-hydraulic lifting hoist moves down, the heavy object level can do work, which will drive the hydraulic motor to rotate. The hydraulic oil circuit of the hoist hoist adopts open transmission, and the balance valve is used to stabilize and control the speed of the weight lowering. The potential energy of the weight lowered becomes the heat energy of the hydraulic oil through the throttling effect of the balance valve and is transmitted to the entire hydraulic system for distribution. Lose. In the closed oil circuit, the two-way hydraulic pump and the hydraulic motor are directly connected to form a small internal circulation system. The torque generated by the potential energy of the lowered weight on the hois...

Claims

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Application Information

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IPC IPC(8): B66D1/44B66D5/28
Inventor 李满强沈德峰车友山董武段海金
Owner CHINA FIRST METALLURGICAL GROUP
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