Safety control valve of forklift electro-hydraulic proportional control valve
The integration of a two-position four-way solenoid valve in the LS oil circuit addresses accidental activation issues in electro-hydraulic forklifts, ensuring safe and controlled operations by blocking unintended movements and enabling controlled functions.
Patent Information
- Application Number
- CN202323344044.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-08
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2033-12-08
AI Technical Summary
Electro-hydraulic proportional control forklifts are prone to accidental activation due to low operating force, leading to unexpected movements and safety hazards, and traditional safety control valves are inadequate for forklifts' unique working conditions, particularly in managing cylinder load-induced flow reversals.
A safety control valve is integrated into the LS oil circuit, utilizing a two-position four-way solenoid valve with a Y-type and one-way on/off configuration, featuring a valve core with holes and grooves, ensuring stable operation by blocking unintended actions when power is lost and enabling controlled functions when powered.
Prevents unintended forklift movements by blocking hydraulic actions during power loss and allowing controlled operations upon activation, enhancing safety and reliability.
Smart Images
Figure CN222293536U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an electro-hydraulic proportional control forklift, in particular to an electro-hydraulic proportional control valve group for a forklift. Background Art
[0002] Electro-hydraulic proportional control forklifts are widely welcomed by forklift users because the handle is an electronic switch with low operating force, precise control and good comfort during operation. However, due to the low operating force, it is easy to be started by accidental touch, resulting in unexpected forklift movement and causing danger.
[0003] Traditional safety control valves unload the main oil circuit or the LS oil circuit, and are mostly two-position two-way valves. However, due to the special working conditions of forklifts, the lowering action is caused by the deadweight of the cylinder load, causing the oil in the cylinder lifting chamber to flow back. The flow direction is not in the traditional main oil circuit or LS oil circuit, making the original technical solution unsuitable for application. Summary of the invention
[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a safety control valve for a forklift electro-hydraulic proportional control valve. The utility model optimizes the valve group of the electro-hydraulic proportional control forklift to ensure that it will not be started due to accidental touch.
[0005] The utility model is implemented in this way: a safety control valve of a forklift electro-hydraulic proportional control valve is connected in the LS oil circuit, one end of which is connected to the pressure compensation valve, and the safety control valve is a two-position four-way solenoid valve, one position of which is a Y-type, and the other position is a one-way on and one-way off type.
[0006] The safety control valve of the forklift electro-hydraulic proportional control valve comprises a valve sleeve and a valve core in the valve sleeve. One end of the valve core is driven by a moving iron core driven by an electromagnet to move and switch positions, and the other end is a port 1. Ports 2, 3, and 4 are arranged on the valve sleeve from port 1 to the other electromagnet end to connect the oil circuit.
[0007] The valve core is provided with holes and grooves meeting the functional requirements and is connected with the oil circuit through ports 1, 2, 3 and 4 on the valve sleeve.
[0008] After the forklift involved in the utility model stops, the safety control valve loses power, the Ls oil circuit is unloaded, the forklift hydraulic system loses pressure, and the forklift actions such as rising, forward and backward tilting are shielded. At the same time, the spring chamber of the pressure compensation valve is also connected to T, and the pressure compensation valve works in the cut-off position, so that the forklift descending action is shielded. At this time, no matter how the operating handle is operated, the forklift will not have any action. After the forklift is turned on, the electronic switch is pressed, the safety control valve is energized, the Ls oil circuit is blocked from T, the forklift hydraulic system can build up pressure, and the forklift can start working. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The utility model is further described below in conjunction with the accompanying drawings:
[0010] Figure 1 It is a schematic diagram of the structure of the utility model;
[0011] Figure 2 It is the principle diagram of the utility model;
[0012] Figure 3 This is a schematic diagram of the valve port setting of the safety control valve of the utility model;
[0013] Figure 4 It is a schematic diagram of the forklift valve group of the utility model in the power-off state;
[0014] Figure 5 It is a schematic diagram of the forklift valve group of the utility model in the energized state; DETAILED DESCRIPTION
[0015] like Figure 1 As shown, the safety control valve of the forklift electro-hydraulic proportional control valve of the utility model is connected in the LS oil circuit 7, and one end of it is connected to the pressure compensation valve. The safety control valve is a two-position four-way solenoid valve, one of its positions is Y-type, and the other position is one-way on and one-way off type.
[0016] See also Figure 2 and Figure 3 , Figure 1 6 is a sealing ring. The safety control valve of the forklift electro-hydraulic proportional control valve comprises a valve sleeve 2 and a valve core 3 in the valve sleeve. One end of the valve core is driven by a moving iron core 5 driven by an electromagnet 1 to move and switch positions, and the other end is a port 1. Ports 2, 3, and 4 are arranged on the valve sleeve from port 1 to the other electromagnet end in sequence to connect the oil circuit. The valve core 3 is provided with holes and grooves that meet the functional requirements, and is connected to the oil circuit through ports 1, 2, 3, and 4 on the valve sleeve.
[0017] When the solenoid valve loses power (see Figure 4 ), the spring pushes the iron core and the valve core to the right, so that ports 1, 2, and 4 keep the oil circuit flowing, and port 3 remains sealed. Holes A and B are designed for pressure balance between the valve core and the moving iron core, so that the spring chamber is filled with oil. According to Pascal's principle, the valve core remains stable.
[0018] When the solenoid valve is energized (see Figure 5 ), the electromagnet attracts the moving iron core to the left, and the moving iron core pulls the valve core to the left, ports 1 and 4 keep the oil circuit flowing, and ports 2 and 3 keep sealed; the function of valve core 1 is to ensure the key factor of flow of ports 2 and 3, and multiple pressure-equalizing grooves are provided here to reduce the diameter clamping force generated by the valve core and avoid valve sticking.
Claims
1. The safety control valve of the forklift electro-hydraulic proportional control valve is characterized by: It is connected in the LS oil circuit, and one end thereof is connected to the pressure compensation valve. The safety control valve is a two-position four-way solenoid valve, one position of which is a Y-type, and the other position is a one-way-on and one-way-off type.
2. The safety control valve of the forklift electro-hydraulic proportional control valve according to claim 1, characterized in that: It includes a valve sleeve and a valve core in the valve sleeve. One end of the valve core is driven by a moving iron core driven by an electromagnet to move and switch positions, and the other end is a port. 2, 3, and 4 ports are arranged on the valve sleeve from port 1 to the other electromagnet end to connect the oil circuit.
3. The safety control valve of the forklift electro-hydraulic proportional control valve according to claim 2, characterized in that: The valve core is provided with holes and grooves meeting the functional requirements and is connected with the oil circuit through ports 1, 2, 3 and 4 on the valve sleeve.