CN111486146A - A position detection cover plate type hydraulic control check valve - Google Patents

Abstract

The invention discloses a position detection cover plate type hydraulic control one-way valve. The structure includes a valve core arranged in a valve seat, one end of the valve core is sealed on the valve seat through a contact surface, and the other end is connected by a shaft steel wire retaining ring and a spring. The seat is fixed, and the spring is installed between the spring seat and the valve seat. Through the pre-compression force of the spring, the contact surface of the valve core and the valve seat is tightly sealed to form a leak-free sealing surface; in order to ensure the smooth movement of the valve core In order to prevent the leakage of hydraulic oil, a special shaft seal is designed and installed in the guide part; the invention has compact structure, small external installation size, large oil flow, and can It is directly integrated and installed in the oil circuit block, or directly installed on the end cover of the actuator, and the invention can intuitively detect the closed state of the hydraulic control check valve spool, and the connection form of the cover plate installation is convenient for installation and convenience A position detection cover type hydraulic control check valve for maintenance.

Description

A position detection cover plate type hydraulic control check valve

technical field

The invention relates to the technical field of hydraulic valve parts, in particular to a position detection cover plate type hydraulic control check valve.

Background technique

Hydraulic control check valve is a kind of globe valve. It is mainly used for the isolation of the hydraulic circuit under pressure in hydraulic transmission. When the hydraulic pipeline is broken, it is used as a safety measure to prevent pressure loss of the load, or to prevent the hydraulic actuator from being locked in the hydraulic pressure. time crawling. At present, traditional hydraulic control check valves are mainly plate type and flange type. Their disadvantages are: heavy weight, large installation size, large installation space, and whether the valve port of the hydraulic control check valve is closed cannot be displayed intuitively. Flanged styles require separate piping connections, increasing the risk of piping leaks.

SUMMARY OF THE INVENTION

The main technical problem solved by the present invention is how to provide a compact structure, small external installation size, and large oil flow, which can be directly integrated and installed in the oil circuit block, or directly installed on the end cover of the actuator (such as a hydraulic cylinder). , and the invention can intuitively detect the closed state of the hydraulic control check valve spool, the connection form of the cover plate installation, convenient installation and easy maintenance.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a position detection cover plate type hydraulic control check valve, the structure of which includes a valve seat, a valve core, a damping, a gland, a spring seat, a spring, and a steel wire stopper for the shaft. Ring, top core, screw plug, Gree ring for hole, guide ring, O-ring and retaining ring 1, O-ring and retaining ring 2, O-ring and retaining ring 3, special seal for shaft, O-ring And retaining ring four, high pressure proximity switch,

The valve seat is provided with a valve core, one end of the valve core is sealed on the valve seat through the contact surface, the other end is fixed with the spring seat by the shaft with a steel wire retaining ring, the spring is installed between the spring seat and the valve seat, and the spring The compressive force makes the contact surface of the valve core and the valve seat tightly seal and form a leak-free sealing surface; in order to ensure the smoothness of the valve core movement, a longer guide part is designed in the valve seat, and the guide part is connected to the valve. The clearance between the seats is 0.03mm. In order to prevent the leakage of hydraulic oil, a special seal for the shaft is designed and installed in the guide part.

Preferably, the valve seat is installed in the gland through clearance fit to prevent hydraulic oil from leaking out, and an O-ring and a retaining ring are provided.

Preferably, a control oil port X and an oil drain port Y are designed on the gland, and damping is designed and installed at the control oil port X and the oil drain port Y respectively.

Preferably, the gland is designed with evenly distributed mounting holes and symmetrical hoisting holes, and the hydraulic control check valve is installed in the jack through the mounting holes. In order to prevent internal leakage and external leakage, an O-ring and Retaining ring two, O-ring and retaining ring three and O-ring and retaining ring four.

Preferably, one end of the steel wire retaining ring is provided with a spring seat, and when the valve core is closed, the spring seat is in contact with the top core.

Further, two guide rings are installed on the top core, and between the top core and the gland, a Gree ring for holes is arranged, and the projected area of the top core is 3 times the projected area of the sealing surface of the valve core and the valve seat.

Preferably, the high pressure resistant proximity switch is installed on the top of the gland through a screw connection. When the hydraulic control check valve is completely closed, the distance between the sensing detection surface of the high pressure resistant proximity switch and the top core is 1 mm.

The invention has a compact structure, saves installation space, and satisfies the effective isolation of the hydraulic system, especially the hydraulic system with a flow rate of more than 3000 L/min. And the present invention can intuitively detect the closed state of the hydraulic control check valve core. The connection form of the cover plate installation is convenient for installation and maintenance. The invention is a one-time expandable technical innovation to the prior art, and has good promotion and use value.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

1 is a schematic structural diagram of a specific embodiment of the present invention;

Fig. 2 is the right side view of Fig. 1 of the present invention;

Figure 3 is a schematic diagram of the valve seat structure of the present invention;

4 is a JIS hydraulic graphic symbol when the hydraulic control check valve of the present invention is in a closed state;

Fig. 5 is the structure diagram of the free flow state of the hydraulic control one-way valve of the present invention;

Fig. 6 is the structure diagram of the reverse flow state of the hydraulic control one-way valve of the present invention;

Reference number:

1-Valve seat; 1.1-Guide part; 1.2-Seal surface thorn to keep acute angle part; 2-Spool; 3-Damp; 4-Gland; 41-Installation hole; 42-Hanging hole; 5-Spring seat; 6 -spring; 7-wire retaining ring for shaft; 8-top core; 9-plug; 10-Grey ring for hole; 11-guide ring; 12-O-ring and retaining ring one; 13-O-ring and Retaining ring two; 14-O-ring and retaining ring three; 15-shaft with special seal; 16-O-ring and retaining ring four; 17-high pressure proximity switch.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIGS. 1-6 , in a specific embodiment of the present invention, a position detection cover plate type hydraulic check valve, its structure includes a valve seat 1, a valve core 2, a damping 3, a gland 4, a spring Seat 5, spring 6, steel wire retaining ring for shaft 7, top core 8, screw plug 9, Gree ring for hole 10, guide ring 11, O-ring and retaining ring 1 12, O-ring and retaining ring 2 13, O-ring and retaining ring three 14, shaft seal 15, O-ring and retaining ring four 16, high pressure proximity switch 17, valve seat 1 is provided with valve core 2, one end of valve core 2 passes through the contact surface It is sealed on the valve seat 1, the other end is fixed with the spring seat 5 by the shaft steel wire retaining ring 7, the spring 6 is installed between the spring seat 5 and the valve seat 1, and the valve core 2 and the valve seat are made by the pre-compression force of the spring. The contact surface of 1 is tightly sealed to form a leak-free sealing surface; in order to ensure the smoothness of the movement of the valve core 2, a longer guide part 1.1 is designed in the valve seat 1, and the gap between the guide part and the valve seat The fit is 0.03mm. In order to prevent the leakage of hydraulic oil, a shaft seal 15 is designed and installed in the guide part.

In the specific implementation process, the valve seat 1 is installed in the gland 4 through clearance fit to prevent the hydraulic oil from leaking out, and an O-ring and a retaining ring 12 are provided.

In the specific implementation process, a control oil port X and an oil drain port Y are designed on the gland 4, and a damper 3 is designed and installed at the control oil port X and the oil drain port Y respectively.

In the specific implementation process, the gland 4 is designed with evenly distributed installation holes 41 and symmetrical hoisting holes 42, and the hydraulic control check valve is installed in the jack through the installation holes. In order to prevent internal leakage and external leakage, an O Ring and retaining ring two 13, O-ring and retaining ring three 14 and O-ring and retaining ring four 16.

In the specific implementation process, one end of the wire retaining ring 7 is provided with a spring seat 5 , and when the valve core is closed, the spring seat 5 is in contact with the top core 8 .

In the specific implementation process, two guide rings 11 are installed on the top core 8, and a Gree ring 10 for holes is set between the top core and the gland. The projected area of the top core 8 is the valve core 2 and the valve seat 1. 3 times the projected area of the sealing surface.

In the specific implementation process, the high pressure resistant proximity switch 17 is installed on the top of the gland 4 through a screw connection. When the hydraulic control check valve is completely closed, the distance between the sensing detection surface of the high pressure resistant proximity switch 17 and the top core is 1mm.

In the specific implementation process, the valve seat 1 is made of 42CrMo alloy material, which is modulated to HRC28-32, and the valve seat and the valve core contact the sealing surface to remove stabs and maintain an acute angle of 1.2 (see Figure 3). The valve core 2 is made of 20CrMo alloy material, carburized, quenched to HRC58-63, and polished. One end of the valve core 2 is sealed on the valve seat 1 through the contact surface, and the other end is fixed with the spring seat 5 by the steel wire retaining ring 7 for the shaft. The spring 6 is installed between the spring seat 5 and the valve seat 1, and the pre-compression force of the spring , so that the contact surface of the valve core 1 and the valve seat 2 is tightly sealed to form a leak-free sealing surface. In order to ensure the smoothness of the movement of the valve core, a longer guide part 1.1 is designed in the valve seat,

In the specific implementation process, in order to make the hydraulic control one-way valve easy to control, a top core 8 is set, and the projected area of the designed top core is 3 times the projected area of the sealing surface of the valve core and the valve seat, so that the pilot of the hydraulic control one-way valve is The control ratio is 3:1. In order to ensure that there is no jamming phenomenon when the top core moves, two guide rings 11 are set on the top core. 10 of the holes are provided with the Gley ring between the settings. The high-pressure-resistant proximity switch 17 is installed on the top of the gland 4 through a screw connection. When the hydraulic control check valve is completely closed, the distance between the proximity switch sensing detection surface and the top core is 1mm.

In the specific implementation process, the clearance fit of the guide portion is 0.03mm. In order to prevent the leakage of hydraulic oil, a special shaft seal 15 is designed in the guide part. The valve seat 1 is installed in the gland 4 through clearance fit, and an O-ring and a retaining ring 12 are provided to prevent the hydraulic oil from leaking out. Control oil port X and oil drain port Y are designed on gland 4. In order to ensure the smooth movement of the spool, damping 3 is designed in the control oil port and oil drain port to control the flow of control oil and oil drain, so that the liquid The control check valve is more stable during the opening and closing movement. The gland is designed with evenly distributed mounting holes and symmetrical hoisting holes. The hydraulic control check valve is installed in the jack through the mounting holes. In order to prevent internal leakage and external leakage, O-rings and retaining rings are provided 13, 14 and 16. In order to make the hydraulic control check valve easy to control, a top core 8 is set up, and the projected area of the designed top core is 3 times the projected area of the valve core and the valve seat sealing surface, so the pilot control ratio of the hydraulic control check valve is 3: 1. In order to ensure that there is no jamming phenomenon when the top core moves, two guide rings 11 are set on the top core. Hole with 10 gram circle. The high-pressure-resistant proximity switch 17 is installed on the top of the gland 4 through a screw connection. When the hydraulic control check valve is completely closed, the distance between the sensing detection surface of the proximity switch 17 and the top core is 1mm (see Figure 1).

Figure 4 is the JIS hydraulic graphic symbol when the cover plate type hydraulic control check valve is closed. Combined with the application of the cover plate type hydraulic control check valve in the hydraulic system, the present invention is further explained:

When the cover type hydraulic control check valve is in the closed state, the hydraulic oil cannot move from the oil port A to the oil port B. At this time, the oil port A→the oil port B is in the cut-off state, but the hydraulic oil in the oil port B can overcome the spring. force to open the spool. At this time, the oil port B→the oil port A is in a free flow state. When the valve core is fully opened, the spring seat 5 is in contact with the valve seat 1 and positioned.

Fig. 5 is the structure diagram of the hydraulic control check valve in the free flow state of the present invention, and Fig. 6 is the structure diagram of the new hydraulic control check valve in the reverse flow state.

When the control oil port enters oil, the control oil acts on the top core after passing through the hole, the top core pushes the spring seat to move, compresses the spring, and finally makes the valve core move, the valve port of the cover type hydraulic control check valve is opened, and the hydraulic oil can realize Interconnection from port A to port B and from port B to port A. As the valve core continues to move, when the spring seat 5 is in contact with the valve seat 1, the top core 8 is not in contact with the valve seat 1. At this time, the hydraulic control check valve core is passively fully opened, and the hydraulic control check valve has the largest flow rate. When the control oil disappears, the force on the top core disappears, and the spring begins to reset. Under the action of the spring force, the spring seat starts to move, and drives the valve core and the top core to move synchronously. After the spring is reset, the valve core and the valve seat are completely sealed and closed, the valve port is closed, and the cover plate type hydraulic control check valve is closed again. At this time, the top core is also reset, and the high-pressure proximity switch 17 senses the position of the top core, and sends out a closed state signal of the hydraulic control check valve. This closed state signal can be used as a command signal for the action of the hydraulic system or other hydraulic components.

The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the patent of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description of the present invention, or directly or indirectly applied in other related technical fields, are all applicable. Similarly, it is included in the scope of patent protection of the present invention.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (10)

1. A cover plate type hydraulic control check valve for position detection, characterized in that its structure includes a valve seat, a valve core, a damping, a gland, a spring seat, a spring, a steel wire retaining ring for a shaft, a top core, a screw plug, Gree ring, guide ring, O-ring and retaining ring for holes 1, O-ring and retaining ring 2, O-ring and retaining ring 3, special seal for shaft, O-ring and retaining ring 4. High pressure resistance The valve seat is provided with a valve core, one end of the valve core is sealed on the valve seat through the contact surface, the other end is fixed with the spring seat by the shaft with a steel wire retaining ring, the spring is installed between the spring seat and the valve seat, and the spring is installed between the spring seat and the valve seat. The pre-compression force of the valve core makes the contact surface of the valve core and the valve seat tightly seal and form a leak-free sealing surface; in order to ensure the smoothness of the valve core movement, a longer guide part is designed in the valve seat. The clearance fit with the valve seat is 0.03mm. In order to prevent the leakage of hydraulic oil, a special shaft seal is designed and installed in the guide part. 2. A cover type hydraulic control check valve for position detection according to claim 1, characterized in that the valve seat is installed in the gland through clearance fit to prevent hydraulic oil from leaking out, and an O-ring and a stopper are provided. Circle one. 3. A position detection cover plate type hydraulic control check valve according to claim 1, wherein a control oil port X and an oil drain port Y are designed on the gland, and the control oil port X and the oil drain port are designed on the gland. Dampers are designed and installed at Y respectively. 4. A cover plate type hydraulic control one-way valve for position detection according to claim 1, characterized in that the gland is designed with evenly distributed mounting holes and symmetrical hoisting holes, and the hydraulic control one-way valve is installed through the mounting holes. The valve is installed in the socket. In order to prevent internal leakage and external leakage, an O-ring and retaining ring 2, O-ring and retaining ring 3, and O-ring and retaining ring 4 are provided. 5. A cover type hydraulic control check valve for position detection according to claim 1, characterized in that the spring seat is fixed on the valve core through the shaft with a steel wire retaining ring, and in the closed state of the valve core, the spring seat and the valve core are closed. Top core contacts. 6 . The cover plate type hydraulic control check valve for position detection according to claim 5 , wherein two guide rings are installed on the top core. 7 . 7 . The cover plate type hydraulic control check valve for position detection according to claim 5 , wherein a Gree ring for holes is arranged between the top core and the gland. 8 . 8 . The cover plate type hydraulic control check valve for position detection according to claim 5 , wherein the projected area of the top core is 3 times the projected area of the sealing surface of the valve core and the valve seat. 9 . 9. A cover plate type hydraulic control check valve for position detection according to claim 1, characterized in that, the high pressure resistant proximity switch is installed on the top of the gland through a threaded connection, and when the hydraulic control check valve is completely closed, The distance between the sensing detection surface of the high-voltage proximity switch and the top core is 1mm. 10. A cover plate type hydraulic control check valve for position detection according to claim 1, characterized in that the valve seat is made of 42CrMo alloy material, modulated to HRC28-32, and the valve seat and the valve core contact the sealing surface to remove stabs , keep the acute angle, the valve core is made of 20CrMo alloy material, carburized, quenched to HRC58-63, polished.

Images