Pumping equipment and high-low pressure switching system of pumping equipment, pumping system and operation method of pumping system
A high-low pressure switching and pumping equipment technology, applied in the hydraulic field, can solve the problems of poor performance, high cost and failure rate of the pumping system, and achieve the effects of simple structure, low manufacturing cost and use cost, and excellent performance
Active Publication Date: 2015-03-18
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
[0006] The main purpose of the present invention is to provide a pumping equipment and its high and low pressure switching system, pumping system and its operation method to solve the problems of high cost, high failure rate and poor performance of the pumping system in the prior art
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[0025] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0026] In addition to the two pumping oil cylinders, the high-low pressure switching system for pumping equipment in this embodiment also includes first and second hydraulic directional valves, and first and second auxiliary directional valves. Both the directional valve and the above-mentioned auxiliary directional valve are three-position four-way. And, for the first hydraulic reversing valve, its two working oil ports are respectively connected to the rod chamber and the rodless chamber of the first pumping cylinder, and its two control oil ports are respectively connected to the two working oils of the first auxiliary reversing valve. For the second hydraulic reversing valve, its two worki...
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The invention provides pumping equipment and a high-low pressure switching system of the pumping equipment, a pumping system and an operation method of the pumping system, so as to solve the problems that the pumping system in the prior art has high cost, high failure rate and poor performance. The high-low pressure switching system comprises two pumping cylinders, two three-position four-way hydraulic changeover valves and two auxiliary reversing valves, two working ports of a first hydraulic changeover valve are respectively connected with a rod cavity and a rodless cavity of a first pumping cylinder, two control ports of the first hydraulic changeover valve are respectively connected with two working ports of a first auxiliary reversing valve; two working ports of a second hydraulic changeover valve are respectively connected with a rod cavity and the rodless cavity of a second pumping cylinder, two control ports of the second hydraulic changeover valve are respectively connected with two working ports of the second auxiliary reversing valve, one of the oil outlet and the oil inlet of the first hydraulic changeover valve is connected with one of the oil outlet and the oil inlet of the second hydraulic changeover valve. By adopting the technical scheme, high-low pressure pumping switching, automatic cylinder locking in a standby state and simultaneous stretching or retraction of the cylinders can be realized.
Description
technical field [0001] The invention relates to the field of hydraulic technology, in particular to pumping equipment, a high-low pressure switching system, a pumping system and an operating method thereof. Background technique [0002] During the working process of pumping equipment such as concrete pumping equipment, it is necessary to perform low-pressure large-displacement work or high-pressure small-displacement work according to different working conditions. When working at low pressure and large displacement, the two pumping cylinders have oil in the rod cavity, and the rod cavity is connected; when working at high pressure and small displacement, the two pumping cylinders have oil in the rod cavity, and the rod cavity is connected. [0003] CN200910116607.5 discloses an automatic high-low pressure switching and co-direction telescopic hydraulic device for pumping double main cylinders of a concrete pump truck. This device has many hydraulic components, complex struct...
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IPC IPC(8): F15B11/20
Inventor 曹奎
Owner ZOOMLION HEAVY IND CO LTD