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Hydraulic system and crane

A hydraulic system and pressure technology, which is applied in the field of construction machinery, can solve problems such as rocker arm support fracture, mechanical steering rod instability and bending, and difficult turning, and achieve the effect of meeting energy-saving needs

Active Publication Date: 2019-10-08
XUZHOU HEAVY MASCH CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The inventors have found that there are at least the following problems in the prior art: due to the limitations of the existing structure of the oversized and steering system, it is difficult for the existing vehicle to turn in a narrow work site, and the mechanical steering rod is unstable and bent or Breakage, rocker arm support breakage and other faults occur

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  • Hydraulic system and crane
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Embodiment Construction

[0065] Combine below Figure 1 to Figure 9 The technical solution provided by the present invention is described in more detail.

[0066] In order to more clearly introduce the various technical solutions of this embodiment, the hydraulic system is used as an example on engineering machinery. Construction machinery is, for example, a crane, especially a kiloton class crane.

[0067] The crane includes a plurality of axles 5, which are divided into front axles and rear axles according to different driving methods. The number of front axles and rear axles is, for example, multiple. In some embodiments, the number of front axles is three, for example, and the number of rear axles is six. The three front axles are all driven by the mechanical linkage 7, and the six rear axles are driven by the hydraulic system provided by the embodiment of the present invention.

[0068] Compared with the hydraulically driven axles 5 of the crane in the prior art, which must be less than 4, th...

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Abstract

The invention discloses a hydraulic system and a crane, and relates to the field of engineering machinery. The hydraulic system and the crane are used for optimizing the performance of a hydraulic system. The hydraulic system comprises a pump, a plurality of execution elements, a pressure comparison valve and a control valve set; the pump comprises a pump oil outlet, a pump oil return port and a pump load feedback oil port; the pressure comparison valve is connected with the pump load feedback oil port and the execution elements, and the pressure comparison valve is configured to be switchablein the following two states of feeding back the maximum load pressure of each execution element to the pump and inputting the constant pressure to the pump load feedback oil port. The control valve set is arranged on the oil path between the pump and the execution elements and is used for controlling the action of the execution elements. The pump is configured to control the output oil pressure according to the pressure input by the pressure comparison valve. According to the hydraulic system, the outlet pressure of the pump can be constant or can be changed along with the load working pressure, so that the use requirements of thousand tons of engineering machines can be met.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a hydraulic system and a crane. Background technique [0002] Thousand-ton cranes are large in size and strong in working capacity, and are increasingly widely used in various industries. In order to meet the requirements for handling stability and maneuverability, the steering of the front and rear axles of the thousand-ton crane chassis is controlled by different components: the steering wheel is used to directly mechanically manipulate the front axle mechanical steering mechanism, and the steering wheel is controlled by electronic control or hydraulic control technology. Rear axle steering. The number of axles on the rear axle does not exceed 4. [0003] The inventors have found that there are at least the following problems in the prior art: due to the limitations of the existing structure of the oversized and steering system, it is difficult for the existing vehicle to...

Claims

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Application Information

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IPC IPC(8): B62D5/06B62D5/08F15B11/16F15B13/06F15B13/02
CPCB62D5/062B62D5/08F15B11/165F15B13/026F15B13/06F15B2013/002F15B2211/25F15B2211/78
Inventor 王志芳马云旺崔向坡宋建军郁中太孙建华张金星郑国俊李向军
Owner XUZHOU HEAVY MASCH CO LTD
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