High-stability lifting control valve group

Abstract

The utility model discloses a high-stability lifting control valve group which comprises a rectangular valve block, a P1 port and a P2 port are formed in the two opposite sides of the valve block respectively, a T1 port and a T2 port are formed in the two adjacent side faces of the valve block respectively, and a thread plug-in type one-way valve, a proportional flow valve and an overflow valve are installed on the upper side and the lower side of the valve block respectively. The one-way valve is connected with the P1 port and the P2 port, the proportional flow valve and the overflow valve are connected to an output oil way of the one-way valve in parallel, the output end of the proportional flow valve is communicated with the T1 port, and the output end of the overflow valve is communicated with the T2 port. The proportional flow valve can be widely used under the working conditions of different load required flows, the flow required by the load is controlled by changing the current input into the proportional flow valve, the requirement for controlling the lifting speed of the load under different working conditions is effectively met, and therefore the adaptability of the valve set is good.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valve groups, in particular to a lifting control valve group with high stability. Background Art

[0002] The oil cylinder lifting control valve group in engineering machinery is mostly composed of integrated one-way valves, solenoid valves, overflow valves and other hydraulic components. When the solenoid valve is powered on and off, there is a problem that the load automatically rises or falls, which affects the load movement and poses certain risks. To solve this problem, the prior art also has many lifting valves or holding valves used in such working conditions, which can control the lifting and holding of the oil cylinder while ensuring safety. However, in actual applications, control valve groups are often used to assemble different models or hydraulic systems, and the pump output flow and required flow are often inconsistent, resulting in low efficiency or uncontrollable speed of the oil cylinder, and poor adaptability of the control valve group. Utility Model Content

[0003] The purpose of the utility model is to provide a lifting control valve group with high stability to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-stability lifting control valve group, including a rectangular valve block, the valve block is provided with a P1 port and a P2 port on two opposite sides, the valve block is provided with a T1 port and a T2 port on two adjacent sides, and a threaded plug-in one-way valve, a proportional flow valve and a relief valve are respectively installed on the upper and lower sides of the valve block, the one-way valve is connected to the P1 port and the P2 port, the proportional flow valve and the relief valve are connected in parallel to the output oil circuit of the one-way valve, the output end of the proportional flow valve is connected to the T1 port, and the output end of the relief valve is connected to the T2 port.

[0005] Preferably, an oil passage is provided in the valve block to connect the T1 port and the T2 port.

[0006] Compared with the prior art, the beneficial effect of the utility model is that the proportional flow valve can be widely used under working conditions with different load flow requirements. The flow required by the load can be controlled by changing the current input to the proportional flow valve, effectively meeting the needs of controlling the load lifting speed under different working conditions. Therefore, the adaptability of this valve group is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the hydraulic principle of the utility model;

[0008] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;

[0009] Figure 3 It is a cross-sectional structural schematic diagram of the utility model.

[0010] In the figure: 1. Valve block; 2. Check valve; 3. Proportional flow valve; 4. Overflow valve. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0012] See also Figure 1-3 The utility model provides a technical solution: a high-stability lifting control valve group, including a rectangular valve block 1, the valve block 1 is provided with a P1 port and a P2 port on two opposite sides, the P1 port is the input port of the oil, and the P2 port is used to connect the lifting cylinder. The valve block 1 is provided with a T1 port and a T2 port for oil return pressure relief on two adjacent sides. An oil channel is provided in the valve block 1 to connect the T1 port and the T2 port. A threaded plug-in check valve 2, a proportional flow valve 3 and a relief valve 4 are installed on the upper and lower sides of the valve block 1, respectively. The check valve 2 connects the P1 port and the P2 port, the proportional flow valve 3 and the relief valve 4 are connected in parallel to the output oil circuit of the check valve 2, the output end of the proportional flow valve 3 is connected to the T1 port, and the output end of the relief valve 4 is connected to the T2 port.

[0013] Working principle: Oil enters from port P1, passes through the internal channel of the valve block, and passes through the check valve 2 to port P2. Port P2 is connected to the rodless chamber of the oil cylinder that controls the load lifting. The overflow valve 4 is to prevent the load from suddenly increasing, causing a sharp increase in the pressure in the oil channel, and plays a protective role. The check valve 2 plays a pressure-maintaining role when the load needs to maintain a certain position. The proportional flow valve 3 has a built-in check valve. When the check valve 2 maintains pressure, the proportional flow valve 3 can basically achieve zero leakage, thereby ensuring the pressure-maintaining performance of the valve group. When the proportional flow valve 3 is powered on, the opening size of the valve core inside the proportional flow valve 3 can be controlled by adjusting the input current, thereby achieving the control of the flow rate through the proportional flow valve 3, and then the flow in the oil channel can be adjusted to maintain the flow rate required by the load, and the excess flow is discharged from the proportional flow valve 3. The output control adjustment is sensitive and stable.

[0014] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-stability lifting control valve group, comprising a rectangular valve block (1), wherein the valve block (1) is provided with a P1 port and a P2 port on two opposite sides, and the valve block (1) is provided with a T1 port and a T2 port on two adjacent sides, wherein: A threaded plug-in check valve (2), a proportional flow valve (3) and a relief valve (4) are respectively installed on the upper and lower sides of the valve block (1); the check valve (2) is connected to the P1 port and the P2 port; the proportional flow valve (3) and the relief valve (4) are connected in parallel to the output oil circuit of the check valve (2); the output end of the proportional flow valve (3) is connected to the T1 port, and the output end of the relief valve (4) is connected to the T2 port.

2. The high stability lifting control valve group according to claim 1 is characterized in that: An oil passage is arranged in the valve block (1) to connect the T1 port and the T2 port.

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