Load pressure feedback proportional multi-way valve for electric forklifts

Abstract

The invention discloses a loading pressure feedback proportional multi-way valve for an electric forklift. The loading pressure feedback proportional multi-way valve includes a valve body (3), a main valve element (4) and a pilot execution element, wherein the valve body (3) is provided with an oil inlet (160 and a return oil hole (6) communicating with a valve cavity (17); the loading pressure feedback proportional multi-way valve also includes force balancing devices and a loading pressure feedback device, wherein the force balancing devices are connected to two ends of the main valve element (4), the loading pressure feedback device is installed to be close to one side of the valve body communicating with an oil cylinder connecting port (5); the pilot execution element is two proportional pilot valve assemblies (15) which respectively communicate with the valve cavities of the force balancing devices at two ends of the main valve element (4). After adopting the loading pressure feedback proportional multi-way valve, the heavier the cargoes on the fork are, the slower the descent rate is, and the lighter the cargoes on the fork are, the quicker the descent rate is, thus doing not need manual adjustment, and greatly improving automation and production efficiency.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a load pressure feedback proportional multi-way valve used on electric forklifts on a loading and unloading transport machine with a lifting mechanism to control the speed of objects falling or rotating due to their own weight. Background technique [0002] An electric forklift is a forklift that uses electricity to do its work. Due to its simple and flexible operation and control, low noise and less pollution, the operator's operation intensity is light, and its electric steering system, acceleration control system, hydraulic control system and braking system are all controlled by electrical signals, which greatly reduces the operating time. The labor intensity of personnel is very helpful to improve their work efficiency and work accuracy. Therefore, it is used in ports, warehousing and tobacco, food, textile and other industries. The fork of the electric forklift has a speed r...

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned structures have the following disadvantages: whether it is the structure that realizes the control of the lowering speed of the pallet fork through the servo motor and the gear mechanism, or the single or two working pumps that are controlled by setting multiple valves on the multi-way valve oil circuit structure, they all have the problems of complex structure and high cost, and the more complex the structure, the higher the failure rate

[0005] 1) Since the main valve core itself is a slender part, it is very difficult to process the throttle hole inside the main valve core, and the requirements for processing equipment are also very high;

[0006] 2) Similarly, because the main valve core is a slender part, it is easy to deform when it is working, and once deformed, the valve will be stuck, the internal orifice will fail, and the descending speed will also lose control. Therefore, there is a great security risk;

[0007] 3) Once a failure occurs, the proportional multi-way valve of this structure cannot be repaired and adjusted at all, and only a complete set of parts can be replaced, so the cost of use is greatly increased

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