CN202900823U - Large drift diameter proportional valve used for weight equipment - Google Patents

Abstract

The utility model relates to a large-diameter proportional water valve for heavy equipment, which includes a stepped valve sleeve, a stepped valve core, a control cover plate, a valve cover, a bottom plate, a displacement sensor and a pilot proportional control valve unit, and is characterized in that: The lower part of the core is put into the valve sleeve, and there is a seal between the valve core and the valve sleeve. The lower part of the control cover is matched with the valve sleeve, and the upper part of the valve core is matched with the control cover. There are two upper and lower cavities, a bottom plate is set at the bottom of the control cover, the pilot proportional control valve unit is installed on the side of the control cover, and an oil circuit is arranged between the upper and lower cavities and the pilot proportional control valve unit, the oil circuit The pilot control oil port is opened on the bottom plate, the displacement sensor is installed on the valve cover, and a symmetrical circular hole is processed on the side wall of the lower part of the valve sleeve. Its advantages are: simple structure and easy integration, can realize proportional control of flow rate, good linearity, quick response, and reduce pressure shock when unloading.

Description

A large diameter proportional water valve for heavy equipment

technical field

The utility model relates to a large-diameter proportional water valve for heavy equipment, in particular to an "oil-controlled water" proportional plug-in water valve.

Background technique

In recent years, the rapid development of steel, metallurgy, automobile, aerospace and other industries has forced people to have an increasing demand for heavy equipment and higher performance requirements. Forging hydraulic press is a kind of heavy equipment in forging machinery, and its equipment level is one of the symbols to measure the level and ability of a country's machinery manufacturing. The heavy-duty large-scale forging hydraulic press has a large installed power, high system pressure, and complex hydraulic system. When the hydraulic cylinder is loaded, a large amount of hydraulic elastic potential energy is generated inside the cylinder and in the pipeline. These elastic potential energy are released instantly when the hydraulic cylinder is unloaded. There is a huge hydraulic impact between the pipelines of the system, pipelines and hydraulic components, and hydraulic components. Hydraulic shock often causes vibration of equipment or components, and generates noise. If left unchecked, it will cause damage to hydraulic components and lead to production safety accidents in severe cases.

The main control hydraulic components commonly used in the hydraulic system are: (1) slide valve, (2) cartridge valve, (3) sine pump, (4) large diameter proportional valve. The flow capacity of the slide valve is small, and the flow resistance is large. When the system requires a larger flow rate, it is necessary to use two or more valves in parallel, or design a non-standard large-diameter valve, resulting in a large structure and long reversing time. , leakage increase and other issues, with the continuous increase of system flow and pressure, the adaptability of the slide valve system has reached its limit. Cartridge valves are gradually adopted in hydraulic systems due to their advantages such as large flow capacity, fast response, strong anti-pollution ability, reliable operation, and high integration. However, the cartridge valve system belongs to the switch control mode, and hydraulic shock is inevitable. The sine pump is a patented technology of Wepuko-Pahnke in Germany. The sine pump control system does not need filling valves and reversing valves. The system is simplified, the failure points are reduced, the pressure building and pressure relief time and throttling loss are reduced, and the hydraulic impact is small. However, the system must be introduced in a complete set, and the initial investment cost is high. Large-bore proportional valves emerged with the development of proportional technology. They have the characteristics of large flow capacity, fast response, adjustable flow ratio, small impact of pressure relief and unloading, and have certain anti-pollution capabilities.

The above four main control hydraulic components mainly use mineral oil as the transmission medium. Mineral oil has good comprehensive physical and chemical properties, but with the development of industry and the improvement of human awareness of environmental protection, the shortcomings of hydraulic transmission such as easy pollution, easy combustion, and high energy consumption have gradually become prominent, which limits its development to a certain extent and apply. The water medium has a series of advantages such as strong anti-pollution ability, non-combustibility, low cost, and can avoid or reduce product pollution. Pure water hydraulic transmission technology and pure water hydraulic components and systems have become one of the hot technologies and important research directions in the hydraulic industry. one. The valve body of the existing water valve is bulky, complex in structure, and difficult to integrate. The action of the valve core is controlled by the servomotor to push the guide rod. The flow control accuracy is not high, and the linearity is poor. hydraulic shock. Based on the above reasons, the purpose of this utility model is to provide a large-diameter proportional water valve with small hydraulic impact, large flow capacity and adjustable flow rate, which is especially suitable for high-pressure, high-flow heavy equipment transmission hydraulic systems.

Invention content

The purpose of the utility model is to provide a large-diameter proportional water valve which can accurately control the flow rate and has small pressure and unloading impact, and is used for heavy equipment. The present invention controls the movement of the spool in real time through the oil medium small-flow closed-loop system composed of the displacement sensor and the pilot proportional control valve, so as to realize the proportional control of the large-flow water system more accurately. At the same time, for two different transmission media, the valve The core adopts a stepped structure and is sealed with a sealing ring, which can effectively avoid the mixing of the two media.

The technical scheme of the utility model is as follows:

The utility model comprises a stepped valve sleeve, a stepped valve core, a control cover plate, a valve cover, a displacement sensor and a pilot proportional control valve unit. There is a seal, the lower part of the control cover is matched with the valve sleeve, the bonnet is connected with the upper end of the control cover, the upper part of the valve core is matched with the control cover, and an upper chamber, valve A lower chamber is formed between the core, the control cover and the valve sleeve. The upper and lower chambers are isolated from each other, and its volume changes dynamically with the movement of the valve core. There is a bottom plate at the bottom of the control cover, and the pilot proportional control valve unit is installed on On the side of the cover plate, there are matching oil passages between the bottom plate, the valve core and the control cover plate, respectively communicating with the upper and lower chambers and the pilot proportional control valve unit. The pilot control oil port of the oil circuit is opened on the bottom plate. The displacement sensor is installed on the valve cover, and a symmetrical circular hole is processed on the side wall of the lower part of the valve sleeve.

Two upper and lower sealing rings are arranged between the isolation sections of the two cavities between the valve core and the control cover plate;

A first leak detection port is provided between the two sealing rings between the valve core and the control cover plate;

The seal between the valve core and the valve sleeve is an upper and a lower seal ring, the upper one is a static seal, and the lower one is a linear seal;

A second leakage detection port is provided between the two sealing rings between the valve core and the valve sleeve.

Compared with the prior art, the utility model has the following advantages:

The structure is simple and easy to integrate, and the flow control accuracy is high: most of the existing water valves insert the valve core into the main distributor, and rely on the rocker shaft controlled by the servomotor to push the valve stem up and down to control the opening of the water valve, thereby controlling the water medium. Therefore, the structure of the existing water valve body is complicated; the flow rate of the water valve is mainly determined by the angle of rotation of the rocker shaft in the main distributor. Therefore, the existing water valve cannot realize the proportional control of the flow rate, and the linear The degree of pressure is poor, and it is easy to generate a large hydraulic shock when the system is unloaded and unloaded. The utility model introduces electric feedback closed-loop control. The pilot control valve is a proportional solenoid valve with oil medium. The proportional pilot valve and the displacement sensor form a closed-loop system. The displacement signal detected by the displacement sensor is compared with the given input signal to control the pilot. The displacement of the valve enables the position of the spool to be continuously corrected and the control accuracy is improved. Therefore, the proportional water valve is not only simple in structure and easy to integrate, but also can realize the proportional control of the flow rate, and has good linearity, high precision, fast response, and unloading It can reduce pressure shock during pressure unloading.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is a longitudinal sectional view of Fig. 1;

Fig. 3 is the schematic diagram of the oil circuit connected with the pilot control oil port 16, 17 of the utility model;

Fig. 4 is a schematic diagram of the oil circuit connected with the pilot control oil port 4 of the present invention.

Detailed ways

With reference to the accompanying drawings, the utility model includes a stepped valve sleeve 2, a stepped valve core 1, a base plate 3, a control cover plate 5, a valve cover 6, a displacement sensor 7 and a pilot proportional control valve unit 9. In FIG. 1, the stepped The lower part of the spool 1 is put into the stepped valve sleeve 2, the spool 1 and the lower part of the valve sleeve 2 are sealed linearly, and the upper part of the spool 1 and the valve sleeve 2 is statically sealed, and there is a second leakage test between the two sealing rings. Port 14, the lower part of the control cover plate 5 cooperates with the valve sleeve 2, the valve cover 6 and the upper end of the control cover plate 5 are connected by screws 8, the upper part of the valve core 1 cooperates with the control cover plate 5, the upper part of the valve core 1 and the bottom plate 3 and the control The cover plate 5 cooperates, and an upper cavity 11 is formed between the valve core 1, the control cover plate 5 and the valve cover 6, and a lower cavity 13 is formed between the valve core 1, the control cover plate 5 and the valve sleeve 2, two upper and lower The cavities are isolated from each other, and their volumes change dynamically with the movement of the valve core. The bottom plate 3 is connected to the bottom of the control cover plate 5, and an upper and a lower cavity are set between the valve core 1 and the control cover plate 5 between the isolation sections of the two cavities. Two sealing rings, between the two sealing rings, there is a first leakage detection port 12 which is passed through the control cover plate 5; the pilot proportional control valve unit 9 is installed on the side of the control cover plate 5 by screws, and on the bottom plate 3 1. Between the spool 1 and the control cover plate 5 there is an oil circuit that is matched with the upper and lower chambers 11, 13 and the pilot proportional control valve unit 9. On the bottom plate 3, there are pilot control oil ports 4, 16, 17 and the second leak detection port 14 leading to the two sealing rings between the valve core and the valve sleeve, the displacement sensor 7 is installed on the valve cover 6 through threads, and six symmetrical holes are processed on the side wall of the lower part of the valve sleeve 2 Circular hole 10.

压力；当先导比例控制阀单元9得电时，高压控制油

(

＞

)由油路经先导控制油口17进入先导阀单元9后再经油路中控制盖板5上的油道15进向阀芯1与控制盖板5及阀套2所形成的下容腔13，阀芯1向上移动，阀口逐渐打开，上容腔11中的压力油经油路中设在控制盖板5上的油道18和先导控制油口4流出；当先导比例控制阀单元9失电时，控制油

经先导控制油口4和油道18进入向阀芯1与控制盖板5及阀盖6所形成的上容腔11，阀芯1下移，阀口逐渐关闭，下容腔13中的压力油经控制盖板5上的油道15进入先导比例控制阀单元9后再经先导控制油口16流出；同时位移传感器7时刻检测阀芯1的位移，并不断与输入信号相比较，从而控制主阀口的开口度。 The working mode of the utility model is: the water medium flows in through the six circular holes 10 at the bottom of the valve sleeve 2, and flows out through the lower port of the valve sleeve 2; when the valve core 1 is at the lowest end, the water valve of the present invention is in a closed state ; The upper chamber 11 formed by the spool 1 and the control cover plate 5 and the valve cover 6 is maintained

Pressure; when the pilot proportional control valve unit 9 is energized, the high pressure control oil

(

>

) enters the pilot valve unit 9 from the oil passage through the pilot control oil port 17, and then enters the lower cavity formed by the valve core 1, the control cover 5 and the valve sleeve 2 through the oil passage 15 on the control cover 5 in the oil passage 13. The valve core 1 moves upward, the valve port opens gradually, and the pressure oil in the upper chamber 11 flows out through the oil passage 18 on the control cover plate 5 and the pilot control oil port 4 in the oil circuit; when the pilot proportional control valve unit 9 When the power is off, control the oil

Through the pilot control oil port 4 and the oil passage 18, it enters the upper chamber 11 formed by the valve core 1, the control cover plate 5 and the valve cover 6, the valve core 1 moves down, the valve port is gradually closed, and the pressure in the lower chamber 13 The oil enters the pilot proportional control valve unit 9 through the oil passage 15 on the control cover plate 5 and then flows out through the pilot control oil port 16; at the same time, the displacement sensor 7 detects the displacement of the spool 1 at all times, and constantly compares it with the input signal to control The opening of the main valve port.

Compared with ordinary water valves, the pilot valve of the utility model is a proportional solenoid valve for oil medium, and introduces electric feedback closed-loop control at the same time, so the water valve has better controllability and linearity when working. When the valve is used in the forging press system, it can effectively reduce the pressure shock of the system during the pressure relief process while accurately controlling the flow rate.

Claims (5)

1. one kind is used for the large latus rectum ratio of heavy equipment water valve, comprise the stepped shaft valve pocket, stepped spool, the control cover plate, valve gap, base plate, displacement transducer and guide proportion control valve unit, it is characterized in that: pack in the stepped shaft valve pocket in stepped spool bottom, be provided with sealing between spool and valve pocket, the bottom of control cover plate cooperates with valve pocket, valve gap links to each other with control cover plate upper end, the top of spool cooperates with the control cover plate, and spool and control cover plate and valve cover chamber are formed with cavity volume, be formed with lower cavity volume between spool and control cover plate and valve pocket, two cavity volumes are isolated mutually up and down, its volume is with the mobile dynamic change of spool, bottom at the control cover plate is provided with base plate, guide proportion control valve cellular installation is in the side of control cover plate, at base plate, spool and control have between cover plate and match, respectively with two cavity volumes up and down, the oil circuit that guide proportion control valve unit is communicated with, the pilot control hydraulic fluid port of oil circuit is opened on base plate, displacement transducer is installed on the valve gap, and the sidewall in the valve pocket bottom is processed with symmetrical circular port.

2. according to claim 1 for the large latus rectum ratio of heavy equipment water valve, it is characterized in that: between the distance piece of two cavity volumes between described spool and control cover plate, be provided with upper and lower two seal rings.

3. according to claim 2 for the large latus rectum ratio of heavy equipment water valve, it is characterized in that: between two seal rings between described spool and control cover plate, be provided with the first Leak testtion mouth.

4. according to claim 1 for the large latus rectum ratio of heavy equipment water valve, it is characterized in that: what be provided with between described spool and valve pocket is sealed into upper and lower two seal rings, and superposed is static seal, is positioned at the linear sealing that is of bottom.

5. according to claim 4 for the large latus rectum ratio of heavy equipment water valve, it is characterized in that: between two seal rings between described spool and valve pocket, be provided with the second Leak testtion mouth.

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