Load sensitive forklift multi-way valve

Abstract

The invention provides a load sensitive forklift multi-way valve, and belongs to the technical field of engineering machinery hydraulic components. The load sensitive forklift multi-way valve comprises an oil inlet valve piece, a lifting valve piece, an inclined valve piece, a fitting valve piece and an oil return valve piece. All the valve pieces are provided with flow control valve rods and oil inlet one-way valves respectively, the inclined valve piece is provided with a load maintaining valve, and the oil return valve piece is provided with an unloading valve core, a reset spring, a shuttle valve and a secondary overflow valve. The load sensitive forklift multi-way valve has good flow control performance, so that the speed of an executing mechanism is unrelated to the load pressure and is only associated with the stroke of the valve rods, and the pressure of a system is unrelated to flow change of oil feeding. Meanwhile, the inclined valve piece is provided with the load maintaining valve, so that the forwards leaning pressure keeps stable all the time, load on an oil cylinder is lowered, when the system flow is larger than the required flow, oil return is conducted on the redundant flow through the unloading valve core, energy consumption can be effectively reduced, and the load sensitive forklift multi-way valve is high in efficiency and less in power loss, so that fuel is saved and a hydraulic system is lower in heating quantity.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery hydraulic components, and in particular relates to a load-sensitive forklift multi-way valve applied to a quantitative system. Background technique [0002] my country's forklift industry started in the late 1950s and took shape in the 1970s. Although it has developed rapidly and technological innovations have emerged in an endless stream, there is still a gap with foreign countries in key areas. For example, domestic high-end hydraulic system components still rely on imports, not only It is expensive and the supply decision is in foreign hands, resulting in no advantage in the high-end forklift market. Most of the existing small-tonnage forklifts in China are fixed-quantity pumps in consideration of cost. When one pump supplies multiple actuators, the system pressure is determined by overcoming the maximum pressure required for each load (ie lifting), so There must be pressure loss ...

AI Technical Summary

Problems solved by technology

[0002] my country's forklift industry started in the late 1950s and took shape in the 1970s. Although it has developed rapidly and technological innovations have emerged in an endless stream, there is still a gap with foreign countries in key areas. For example, domestic high-end hydraulic system components still rely on imports, not only Expensive and supply decisions are in foreign hands, resulting in no advantage in the high-end forklift market

Most of the existing small-tonnage forklifts in China are fixed-quantity pumps in consideration of cost. When one pump supplies multiple actuators, the system pressure is determined by overcoming the maximum pressure required for each load (ie lifting), so There must be pressure loss when supplying actuators with low loads (tilting and attachments), which not only causes a huge waste of energy consumption, but also increases the temperature of the hydraulic system and causes the aging of components, reducing the service life of the hydraulic system

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