Free-slewing cushion and brake hydraulic system and method used in crawler crane

A crawler crane and slewing buffer technology, which is applied in the directions of load hanging components, transportation and packaging, can solve the problems of driver's cab jitter, poor running stability, hydraulic shock, etc., and achieves fast response speed, stable and reliable work, and avoids damage. Effect

Inactive Publication Date: 2011-11-23
SHANGHAI SANY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control method is prone to problems such as hydraulic shock, cab shake, and poor running stability.

Method used

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  • Free-slewing cushion and brake hydraulic system and method used in crawler crane
  • Free-slewing cushion and brake hydraulic system and method used in crawler crane

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] see figure 1 As shown, a free-slewing buffer braking hydraulic system for a crawler crane of the present invention includes a charge pump 1, a main slewing pump 2, a brake valve 3, an inverse proportional electromagnetic pressure reducing valve 4, a brake 5, a slewing motor 6, a free Swing control valve 7 and relief valve 8.

[0023] Wherein, the main rotary pump 2 and the rotary motor 6 are connected to form a circuit, and the free rotation control valve 7 is connected between the main rotary pump 2 and the rotary motor 6 . An inverse proportional electromagnetic decompression valve 4 is connected between the brake valve 3 and the brake 5 . The pressure output of the inverse proportional electromagnetic decompression valve 4 will decrease with the increase of the current, and the electric pedal or the rotary switch can be used for the current control. In add...

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PUM

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Abstract

The invention provides a free-slewing cushion and brake hydraulic system and method used in a crawler crane. The hydraulic system comprises a main rotary pump, an oil supplementing pump, an overflow valve, a brake valve, a brake, a rotary motor, a free-swing control valve and an inverse-proportional electromagnetic pressure reducing valve, wherein, the inverse-proportional electromagnetic pressure reducing valve is connected between the brake valve and the brake; the main rotary pump and the rotary motor are connected together to form a circuit; and the free-swing control valve is connected between the main rotary pump and the rotary motor. The free-slewing cushion and brake hydraulic system and method used in the crawler crane have the advantages of fast response speed and stable and reliable service performances; and by utilizing the system and method, stable and good brake effect can be provided, hydraulic impact and discomfort of a driver caused by brake are reduced maximally, and inertial impact on the active crawler crane from the passive crawler crane resulting from brake can be effectively prevented so as not to cause damage to the active crawler crane.

Description

technical field [0001] The invention relates to a hydraulic system and a control method thereof, in particular to a free-slewing buffer braking hydraulic system for a crawler crane and a control method thereof. Background technique [0002] In the field of construction cranes, the slewing hydraulic system of crawler cranes usually has a free slewing function. This is because the crawler crane needs to rotate freely due to external forces (gravity, wind, etc.) in the absence of oil supply from the main oil circuit. Especially when two crawler cranes hoist an object at the same time, it is necessary for one of the crawler cranes to freely rotate to cooperate with the active rotation of the other crawler crane. At the same time, it is necessary to control the free slewing state of the crawler crane. [0003] At present, the slewing hydraulic systems of crawler cranes all have the function of free slewing, but the control when it stops usually adopts the method of closing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C13/18
Inventor 张剑彭继文
Owner SHANGHAI SANY TECH
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