CN102192207A - A plug-in medium-flow hard-sealed one-way lock - Google Patents

Abstract

The invention discloses a plug-in type medium-flow hard-sealing one-way lock which is suitable for controlling an oil cylinder of a support and comprises a threaded sleeve, wherein a spring is arranged in the threaded sleeve, the other end of the spring is fixed on a valve core, the valve core and a valve seat which is in threaded connection on the threaded sleeve form conical surface hard sealing under the action of the spring, the whole set of the plug-in type hydraulic assembly is formed, the top end of the valve core penetrates through the valve seat and extends out of a port of the valve seat, a piston which is supported by a small spring and plays a role in controlling is arranged on the inner side. The plug-in type hard sealing structure is adopted, the system is high in integration level, strong in reliability, long in service life and easy to install and maintain, the one-way lock is repaired directly by replacing the plug-in type hydraulic assembly, and the method is simple, convenient and reliable.

Description

A plug-in medium-flow hard-sealed one-way lock

technical field

The invention relates to the field of one-way locks, in particular to a plug-in medium-flow hard-sealed one-way lock.

Background technique

As coal mine use requirements are becoming more and more integrated and automated, the reliability and service life requirements are also getting higher and higher. Traditional one-way locks use valve gasket seals or polyoxymethylene cone seals, and the service life and Insufficient ability to adapt to the environment, the valve pad is easily damaged under the repeated extrusion of the valve seat, and the tapered polyoxymethylene seal will also be damaged by cinders or other hard objects, resulting in seal failure. There are many types of parts inside the valve body, and it is extremely inconvenient to maintain , has been increasingly unable to meet the needs of coal mine users.

Contents of the invention

The purpose of the present invention is to provide a plug-in medium-flow hard-sealed one-way lock to solve the problems of low service life, low adaptability and difficult maintenance of the one-way lock in the prior art.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A plug-in medium-flow hard-sealed one-way lock, including a valve body, the valve body has a valve cavity, and a plurality of liquid inlets and outlets connected to the valve cavity are opened on the valve body, and it is characterized in that: A screw sleeve is installed in the valve cavity from one end of the valve cavity of the valve body, a valve seat is also arranged in the valve cavity, the screw sleeve and the valve seat are screwed together as a whole, and a piston is slidably installed in the valve cavity A spool is slidably installed in the valve seat, the spool is cone-shaped toward one end of the screw sleeve, the other end of the spool passes through the valve seat and points to the piston, a spring is arranged in the screw sleeve, and the spring One end is fixed in the threaded sleeve, and the other end is fixed on the cone-shaped end of the valve core. The valve core acts on the valve seat through a spring to form a hard seal on the cone surface. A small spring is connected between the piston and the valve seat. The spring sleeve is outside the part where the valve core passes through the valve seat, and one end of the small spring is connected to the valve seat, and the other end is connected to the piston.

The invention adopts a plug-in hard seal structure, which has high system integration, strong reliability, long service life, easy installation and maintenance, and the one-way lock is repaired directly by replacing the plug-in hydraulic components, which is simple, convenient and reliable. Parts and structures of the present invention can also form interchangeability with the same series of hydraulic control check valves and bidirectional locks of medium flow.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

Detailed ways

As shown in Figure 1. The structure of the present invention is suitable for the oil cylinder control of the bracket, including a screw sleeve 1 with a safety valve interface. Inside the screw sleeve 1, there is a spring 2 that supports and resets. The other end of the spring 2 is fixed inside the valve core 3, and the valve core 3 passes through the spring. 2 Function and the valve seat 4 threaded on the threaded sleeve 1 forms a hard seal on the conical surface, and the whole set forms a plug-in hydraulic assembly. The top of the valve core 3 passes through the valve seat 4 and extends out of the valve seat 4 port, supported by a small spring 5 The piston 6 that plays a control role is contained in the inside of the valve body 7, and there is a screw thread for easy installation and disassembly in the middle of the piston 6.

The invention adopts a plug-in hard seal structure, which has high system integration, strong reliability, long service life, easy installation and maintenance, and the one-way lock is repaired directly by replacing the plug-in hydraulic components, which is simple, convenient and reliable.

The two working chambers have the same structure, and their working principle is as follows: The connection method of the one-way lock is: the PA port is connected to the working liquid chamber of the reversing valve, the PB port is connected to the working liquid chamber opposite to the reversing valve corresponding to PA, and the A port is connected to the working liquid chamber of the reversing valve. To lock one cavity of the oil cylinder, the B port is connected to the other cavity of the oil cylinder that does not need to be locked, and the A' port is connected to the safety valve or plugged.

When the working conditions need to control the movement of the oil cylinder, the working fluid chamber connected to the PA port of the reversing valve opens to supply liquid, the high-pressure working fluid enters the PA port and pushes the valve core, and the working fluid enters the cylinder lock chamber through the A port, making the cylinder When the PA end stops supplying liquid, the valve core forms a metal hard seal pair with the valve seat under the pressure of the return spring to keep the working fluid in the working chamber of the cylinder locked; when the working condition needs to control the cylinder to retract , the reversing valve is connected to the working fluid chamber of the PB interface to open the liquid supply, and a part of the high-pressure working fluid entering from the PB end pushes the piston to open the valve core, and the valve core is opened for unloading, so that the liquid in the locking chamber flows into the liquid return line through PA , the other part enters the non-locking chamber of the oil cylinder through the B port, and the working chamber is filled with liquid to retract the locked chamber. When the PB end stops supplying liquid, the piston resets under the action of the small spring, and the valve core and the valve seat form a seal and maintain pressure.

Because the hydraulic component of the present invention adopts a metal hard seal structure, the service life and adaptability of the one-way lock are greatly improved, and the installed structure makes maintenance more convenient.

Claims (1)

1. A plug-in medium-flow hard-sealed one-way lock, including a valve body, a valve cavity is arranged in the valve body, and a plurality of inlet and outlet ports connected with the valve cavity are opened on the valve body, and its characteristics That is: a screw sleeve is installed in the valve cavity from one end of the valve cavity of the valve body, a valve seat is also arranged in the valve cavity, the screw sleeve and the valve seat are screwed together as a whole, and the valve cavity is also slidably installed There is a piston; a valve core is slidably installed in the valve seat, and the valve core is in a cone shape toward one end of the screw sleeve, and the other end of the valve core passes through the valve seat to point to the piston, and a spring is arranged in the screw sleeve, so One end of the spring is fixed in the screw sleeve, and the other end is fixed on the cone-shaped end of the valve core. The valve core acts on the valve seat through the spring to form a hard seal on the cone surface. A small spring is connected between the piston and the valve seat. The small spring is sleeved outside the part where the valve core passes through the valve seat, and one end of the small spring is connected to the valve seat, and the other end is connected to the piston.

Images