Switching valve and pumping system

Abstract

The invention discloses a switching valve and a pumping system. The switching valve comprises a valve body. The valve body is provided with a first oil inlet / outlet, a second oil inlet / outlet, a first port, a second port, a third port and a fourth port, wherein the first port and the second port are respectively communicated with the rod cavities of a left oil cylinder and a right oil cylinder; the third port and the fourth port are respectively communicated with the rodless cavities of the left oil cylinder and the right oil cylinder; first cartridge valves are respectively connected between the first oil inlet / outlet and the third port, between the first port and the second port as well as between the fourth port and the second oil inlet / outlet; second cartridge valves are respectively connected between the first oil inlet / outlet and the second port, between the fourth port and the third port as well as between the first port and the second oil inlet / outlet; the first cartridge valves and the second cartridge valves are connected with an electromagnetic directional valve; and the two oil outlets of the electromagnetic directional valve are respectively connected with the control ports of the first cartridge valves and the second cartridge valves. The switching valve provided by the invention has a simple structure, and is capable of effectively performing high and low-pressure oil way switching, so that the high and low-pressure oil way switching is extremely convenient.

Description

technical field [0001] The invention relates to valve technology, in particular to a switching valve and a pumping system. Background technique [0002] The pumping system of construction machinery needs a high-low pressure switching device to switch between high and low pressure oil circuits to meet the needs of different pumping pressures and realize high-pressure pumping and low-pressure pumping, for example, in concrete pump trucks, trailer pumps and vehicle-mounted In the pumping system of the pump, a switching valve is installed as a switching valve for switching between high and low pressure oil circuits to meet the needs of high and low pressure pumping. [0003] Figure 1A It is the front view of the switching valve in the existing concrete pumping system; Figure 1B Left side view of a switching valve in an existing concrete pumping system. In the existing concrete pumping system, the switching of the high and low pressure pumping state by the switching valve is ...

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Problems solved by technology

[0004] In summary, it can be seen that when the switching valve in the existing concrete pumping system switches the high and low pressure oil circuit, it needs to be disassembled and reassembled. Therefore, the pumping system needs to be shut down when the high and low pressure oil circuit is switched, so that the high and low pressure Oil circuit switching is time-consuming and laborious, and the switching process is complicated; moreover, in the process of switching high and low pressure oil circuits, due to the need to disassemble the switching valve, the hydraulic oil is easy to flow out, and external impurities are easy to enter the pumping system, causing oil circuit pollution, resulting in system error

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