CN218494263U - Hydraulic control slide valve - Google Patents

Abstract

The utility model relates to a pilot operated slide valve, the valve rod that sets up for solving current pilot operated slide valve returns meso position buffer function can influence the problem that the slide valve starts corresponding speed, the utility model discloses construct a pilot operated slide valve, including the valve body, the valve rod and the buffer that all arranges at valve rod chamber every end, buffer is including the cover body, cover body cover locates the valve rod tip outside and forms the valve rod control chamber with valve rod clearance fit, the cover body can be relative valve rod endwise slip, be equipped with on the cover body and apply the valve rod butt portion of the effort to valve rod middle part direction and restrict the valve body butt portion of the cover body to valve rod middle part direction removal displacement to the valve rod, be provided with reset spring between the cover body and the valve body, reset spring exerts the elasticity of direction towards valve rod middle part direction to the cover body, be provided with the one-way throttle valve of intercommunication valve rod chamber tip cavity and valve rod control chamber on the cover body. The utility model provides a pilot operated slide valve has the cushioning effect when the valve rod returns the meso position, and its valve rod can quick response when moving the start to left position or right side.

Description

Hydraulic control slide valve

Technical Field

The utility model relates to a hydraulic valve, more specifically say, relate to a hydraulic control slide valve.

Background

The hydraulic control slide valve is a hydraulic part commonly used on engineering machinery and used for controlling a hydraulic execution part. The common hydraulic control slide valve has three working positions, namely a left position, a middle position and a right position, an oil-filled control chamber is arranged at each end of the valve rod in the valve body, and the valve rod is pushed to move when the control chamber is filled with oil, so that the hydraulic control slide valve is positioned at the corresponding working position. A return spring is usually arranged in the control chamber, and when pressure oil is not filled before control at two ends of the valve rod, the valve rod is positioned at a middle position under the elastic force action of the return spring.

In some hydraulic systems, to avoid lash, it is necessary to limit the speed at which the valve stem can be returned to its neutral position during the return of the valve stem to its neutral position. In some hydraulic systems, a one-way throttle valve is arranged on an oil way connecting a control chamber of a hydraulic control sliding valve and a pilot valve, the one-way throttle valve is conducted when oil is filled into the control chamber, and the one-way valve is closed when the oil flows outwards from the control chamber and only can flow out through a damping hole in the one-way throttle valve.

When the hydraulic control slide valve returns to the middle position from the left position or the right position, the oil in the original oil-filled control chamber flows out through the damping hole on the side, and the valve rod returns to the middle position to be buffered due to the damping effect of the damping hole. However, when the valve rod moves in a reversing way from the middle position to the left position or the right position, oil is filled in the control chamber on one side, oil in the control chamber on the other side flows out through the damping hole, and the flowing-out speed is influenced by the damping hole, so that the moving speed of the valve rod is influenced, and the corresponding reversing starting speed of the hydraulic control slide valve is also influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is that current liquid accuse sliding valve sets up the valve rod and can influence the problem that the sliding valve started corresponding speed when returning meso position buffer function, and provides a liquid accuse sliding valve, has the cushioning effect when the valve rod returns the meso position, does not have the damping hysteresis when the switching-over starts.

The utility model discloses a realize that the technical scheme of its purpose is like: the hydraulic control slide valve comprises a valve body and a valve rod positioned in a valve rod cavity of the valve body, wherein two ends of the valve rod cavity are respectively communicated with a control port; a return spring is arranged between the sleeve body and the valve body, the return spring applies elasticity towards the middle direction of the valve rod to the sleeve body, and a one-way throttle valve communicated with the end part of the valve rod cavity and the valve rod control cavity is arranged on the sleeve body.

The utility model discloses among the liquid accuse sliding valve, the valve rod includes that main valve rod and fixed connection install in the tip pole of main valve rod tip, be used for on the valve rod with set body clearance fit's cylinder side setting on the tip pole.

The utility model discloses among the pilot operated sliding valve, the tip pole through screw-thread fit with the main valve pole is connected, be provided with the location shaft shoulder that is used for main valve pole end face to contact on the tip pole, be used for on the valve rod with the position of valve rod butt portion looks butt be main valve pole terminal surface, perhaps be used for on the valve rod with the position of valve rod butt portion looks butt do the location shaft shoulder is the step side of main valve pole terminal surface dorsad.

In the hydraulic control slide valve of the utility model, the end face of the end rod back to the main valve rod is provided with a regular polygon counter bore.

The utility model discloses among the liquid accuse sliding valve, the position between valve rod butt portion and valve body butt portion on the cover body is provided with radially runs through the internal and external radial passageway of cover.

In the hydraulic control slide valve of the utility model, the one-way throttle valve comprises a one-way valve seat fixedly connected with the axial end part of the sleeve body, a spring seat fixedly arranged in the inner cavity of the one-way valve seat, a one-way valve core arranged in the inner cavity of the one-way valve consisting of the one-way valve seat and the spring seat, and a spring arranged between the one-way valve core and the spring seat; and a damping hole for communicating the inner cavity of the one-way valve with the end part of the valve rod cavity is arranged on the one-way valve core or the one-way valve seat.

The utility model discloses among the liquid accuse sliding valve, one-way disk seat and cover body structure as an organic whole, perhaps one-way disk seat pass through the external screw thread with cover body fixed connection.

The utility model discloses among the liquid accuse sliding valve, one-way valve core is the round steel is globular, the spring holder passes through external screw thread fixed mounting and is in the one-way disk seat, the damping hole is arranged on the circumference side of one-way disk seat.

The utility model discloses among the liquid accuse sliding valve, check valve core have with one-way disk seat inner chamber complex cylinder side and with the last oil inlet channel complex pyramis of check valve seat, the damping hole is arranged the top in pyramis.

The utility model discloses among the liquid accuse sliding valve, the circumference side of the cover body is provided with the step, reset spring is coil spring and suit and is in the circumference side of the cover body, reset spring's one end butt is in on the step side of the cover body circumference side.

Compared with the prior art, the utility model provides a liquid accuse sliding valve has the cushioning effect when the valve rod returns the meso position, and its valve rod can quick response when moving the start to the left position or right position.

Drawings

Fig. 1 is a schematic structural view of the hydraulic control slide valve of the present invention.

Fig. 2 is a schematic structural view of a damping device in a pilot operated slide valve according to the present invention.

Fig. 3 is a second structural schematic diagram of the buffering device in the hydraulic control slide valve of the present invention.

Fig. 4 is a third middle structural schematic diagram of the buffering device in the hydraulic control slide valve of the present invention.

Part names and serial numbers in the figure:

the valve comprises a valve body 1, a control port 11, a valve rod cavity 12, a valve rod 2, a main valve rod 21, an end valve rod 22, a cylindrical side surface 221, a regular polygon counter bore 222, a positioning shaft shoulder 223, a valve rod control cavity 23, a sleeve body 3, a valve rod abutting part 31, a valve body abutting part 32, a radial channel 33, a step side surface 34, a return spring 4, a one-way throttle valve 5, a one-way valve seat 51, a one-way valve core 52, a spring seat 53, a clamping ring 54, a spring 55, a one-way valve seat inner cavity 56, a damping hole 57 and an oil inlet channel 58.

Detailed Description

The following description of the embodiments refers to the accompanying drawings.

As shown in fig. 1, the hydraulic control slide valve in the example of the present invention includes a valve body 1, a valve rod 2 located in a valve rod cavity of the valve body, and a buffer device arranged at each end of the valve rod cavity, wherein both ends of the valve rod cavity are respectively communicated with a control port 11.

The valve rod 2 comprises a main valve rod 21 and an end rod 22 fixedly connected and installed at the end of the main valve rod 21, and a plurality of shaft shoulders are arranged on the main valve rod 21 according to needs, so that the shaft shoulders are matched with oil grooves on the valve body 1 to form a passage or cut off an oil circuit when the valve rod is in a left position, a middle position and a right position, the communication state of the oil circuit connected with the hydraulic control slide valve is switched, and a corresponding control function is realized.

The end stem 22 is connected to the main valve stem 21 by a screw-thread fit, the end stem 22 is provided with a positioning shoulder 223 for contacting the end face of the main valve stem 21, and the end face of the end stem 22 facing away from the main valve stem 21 is provided with a regular polygon shaped counter bore 22. The regular polygon counter bore 22 is typically a hexagonal socket and, when assembled, the regular polygon counter bore 22 is used in conjunction with an installation tool to rotate the end stem 22 to thread the end stem 22 into secure connection with the main valve stem 21.

As shown in fig. 1 and 2, the buffering device includes a sleeve body 3, the sleeve body 3 is in a cylindrical shape, an inner hole of the sleeve body is a stepped hole, one end of the sleeve body 3 is sleeved on the outer side of the end portion of the valve rod and is in clearance fit with the cylindrical side surface of the end portion of the valve rod to form a valve rod control cavity 23 in the sleeve body, the cylindrical side surface 221 of the valve rod 2, which is used for clearance fit with the sleeve body 3, is arranged on the end rod 22, the sleeve body 3 can slide relative to the valve rod 2 in the axial direction of the valve rod under the action of external force, and when the sleeve body 3 moves relative to the valve rod, the volume of the valve rod control cavity 23 is correspondingly increased or reduced.

The sleeve body 3 is provided with a valve rod abutting portion 31 and a valve body abutting portion 32, and as shown in fig. 2, the valve rod abutting portion 31 is provided on the inner hole wall surface of the sleeve body 3 for contacting with the step side surface on the valve rod 2. When the stem abutting portion 31 abuts against the stem 2, the sleeve body 3 applies an urging force directed toward the stem middle portion to the stem 2. The portion of the valve stem 2 for abutting against the valve stem abutting portion 31 may be an end surface of the main valve stem 21, as shown in fig. 2; the portion of the stem that abuts the stem abutment 31 may be a stepped side of the end stem 22 where the positioning shoulder 223 faces away from the end face of the main stem 21, as shown in fig. 3.

The valve body abutting portion 32 is used for abutting against the valve body 1 to limit the displacement of the sleeve body 3 to the middle direction of the valve rod, a return spring 4 is arranged between the sleeve body 3 and the valve body 1, and the return spring 4 applies elastic force to the sleeve body 3 in the direction towards the middle direction of the valve rod 2.

The sleeve body 3 is provided with a radial passage 33 radially penetrating the inside and outside of the sleeve body at a position between the valve rod abutting portion 31 and the valve body abutting portion 32. When the valve rod 2 slides relative to the sleeve body 3, the volume of a gap between the position between the valve rod abutting part 31 and the valve body abutting part 32 and the valve rod 2 is changed, oil at the end part of the valve rod cavity 12 enters the gap through the radial channel 33 or oil in the gap enters the end part of the valve rod cavity through the radial channel 33, and the influence on the movement of the valve rod caused by the difference between the gap and the valve rod cavity is avoided.

The outer side surface of the circumference of the sleeve body 3 is provided with a step, the reset spring 4 is a spiral spring and is sleeved on the outer side of the circumference of the sleeve body 3, one end of the reset spring 4 is abutted against the step side surface 34 of the outer side surface of the circumference of the sleeve body, and the other end is abutted against the valve body 1. When the valve rod 2 is in the middle position, the valve body abutting parts 32 of the sleeve bodies at the two ends are abutted against the valve body.

The sleeve body 3 is provided with a one-way throttle valve 5 which is communicated with the end part of the valve rod cavity 12 and the valve rod control cavity 23. As shown in fig. 2, the check throttle valve 5 includes a check valve seat 51 fixedly connected to an axial end portion of the sleeve body 3, a spring seat 53 fixedly installed in an inner cavity of the check valve seat 51, a check valve body 52 installed in an inner cavity of the check valve formed by the check valve seat 51 and the spring seat 53, and a spring provided between the check valve body 52 and the spring seat 53. Spring seat 53 is secured within the internal cavity of check valve seat 51 by snap ring 54.

The check valve core 52 is provided with a cylindrical side surface matched with the inner cavity of the check valve seat and a conical part matched with the oil feeding channel 58 on the check valve seat 51, and a communication oil passage for communicating the inner cavity of the check valve with the valve rod control cavity 23 is arranged in the check valve core 52 and the spring seat 53. The damping hole 57 is disposed at the top end of the taper portion, and one end thereof is connected to the communication oil passage in the check valve spool, and the other end thereof is connected to the oil inlet passage 58 of the check valve.

In some other embodiments, as shown in fig. 4, the check valve element 52 is in the shape of a round steel ball, the spring seat 53 is fixedly installed in the check valve seat 51 through an external thread, and the orifice 57 is disposed on a circumferential side surface of the check valve seat 51, and both ends thereof are connected to the communication oil passage of the spring seat and the end of the valve rod chamber 12, respectively.

As shown in fig. 2 and 4, the check valve seat 51 is fixed in the inner hole of the end of the sleeve body 3 by external thread connection. In some other embodiments, the one-way valve seat 51 and the jacket body 3 can also be of one-piece construction, as shown in fig. 3.

The utility model discloses the theory of operation of liquid accuse slide valve switching-over buffering is as follows:

when no pressure oil is input into the control ports 11 at the two ends of the valve body 1, the pressures of the control ports 11 at the two ends are equal, the check valve channels of the one-way throttle valves at the two ends are in a closed state, the pressures in the valve rod control cavities 23 at the two ends of the valve rod 2 are equal, the sleeve bodies 3 at the two ends enable the respective valve body abutting parts 32 to abut against the valve body 1 under the elastic action of the return spring 4 so as to keep a stable state, the valve rod abutting parts 31 of the sleeve bodies 3 at the two ends abut against the valve rod 2, and the valve rod 2 is kept at a middle position, as shown in fig. 1.

When pilot pressure oil is input into one end of the control ports 11 at two ends of the valve body 1, for example, the control port 11 at the left end of the valve body 1 in fig. 1, the control port 11 at the right end of the valve body is usually communicated with a hydraulic oil tank at this time, the pressure of the control port 11 at the right end of the valve body is lower than that of the control port 11 at the left end, the pressure of the valve rod control chamber 23 at the left end of the valve rod 2 is higher than that of the valve rod control chamber 23 at the right end of the valve rod, the valve rod 2 starts to move rightwards, the volume of the valve rod control chamber 23 at the left end of the valve rod becomes larger, the check valve core at the left end moves rightwards to open the check valve, the pressure oil at the control port 11 at the left end of the valve body enters the valve rod control chamber 23 at the left end of the valve rod through the oil inlet passage 58 of the check throttle valve, the check valve core 52 and the communication oil passage in the spring seat 53, and the oil in the valve rod control chamber 23 pushes the valve rod 2 to move rightwards. When the valve rod 2 moves rightwards, the valve rod 2 is in contact with the valve rod abutting part 31 of the right end sleeve body 3 in a butting mode, and the right end sleeve body 3 is pushed to move rightwards to compress the right reset spring 4. The valve rod 2 moves rightwards until the right end of the valve rod 2 is in contact with the valve body 1 for limiting and stopping, the valve rod is arranged at the right end of the valve rod cavity, and the hydraulic control sliding valve works at the left position. When the valve rod 2 moves rightwards, the valve body abutting part 32 of the sleeve body 3 at the left end abuts against the valve body 1 and is kept still under the action of the elastic force of the left return spring 4. Left end sleeve body

In the process that the valve rod 2 moves rightwards, the valve rod control cavity 23 at the left end of the valve rod is filled with oil, the volume of the valve rod control cavity 23 at the right end of the valve rod is unchanged, the volume of the cavity at the right end of the valve rod cavity is reduced, oil in the cavity at the right end of the valve rod cavity is directly discharged from the control port 11 at the right end of the valve body, the oil discharge process cannot be obstructed by the damping holes, so that the valve rod can move in place quickly, and the hydraulic control slide valve can be started in a quick response mode.

When the pilot operated spool valve returns to the neutral position, for example, from the left position to the neutral position, the valve stem 2 moves from the rightmost end to the neutral position in the stem chamber 12. The valve rod 2 returns to the middle position, the control ports 11 at the two ends of the valve body 1 are not input with pressure oil, the valve rod 2 moves to the middle position by the elasticity of the reset spring 4, and the moving process is as follows:

the pressure of the control ports 11 at the two ends of the valve body is equal, the reset spring 4 compressed at the right end pushes the sleeve body 3 at the right end to move leftwards, and the sleeve body 3 at the right end drives the valve rod 2 to move leftwards. When the valve rod 2 is positioned at the right end of the valve rod cavity, the valve rod 2 is separated from the contact with the valve rod abutting part 31 of the left end sleeve body 3, and the axial acting force of the direct contact action does not exist between the valve rod 2 and the sleeve body 3 at the left end. The valve rod 2 moves leftwards, the left end of the valve rod extrudes oil in the valve rod control cavity 23 at the left end of the valve rod, due to the damping effect of the damping hole, partial oil in the valve rod control cavity 23 at the left end flows into the left end cavity of the valve rod cavity 12 through the damping hole 57, a pressure difference is formed, the left thrust acted on the left end by the oil in the valve rod cavity 23 in the left end is born on the left-end one-way throttle valve through the damping hole, the thrust acts on the reset spring 4 at the left end through the sleeve body 3 at the left end, the reset spring 4 at the left end is compressed, therefore, the valve rod 2 is reset to the middle position from right to left in the process, the valve rod 2 is provided with the reaction force transmitted by the left-end reset spring 4 through the left-end sleeve body 3 and the valve rod control cavity 23 at the left end, and the left-side return oil of the valve rod 2 is buffered. Along with the increase of the valve rod 2 left direction shift volume, the length of right-hand member reset spring 4 increases, and its elasticity that provides reduces, and 23 interior fluid of valve rod control chamber of left end flow out through the damping hole and make the volume reduce, and reset spring 4 of left end begins slow release from the position compressed to maximum amplitude, promote the cover body 3 right side direction removal of left end, and the valve rod butt portion that finally makes the left end cover body and the right-hand member cover body all with valve body looks butt, and the atress reaches the balance and is in the meso position on the valve rod.

The process of moving the valve rod of the hydraulic control slide valve from the middle position to the left is similar to the process of moving the valve rod from the middle position to the right, and the process of returning the valve rod from the left to the middle position is similar to the process of returning the valve rod from the right to the middle position, so the description is omitted.

In this embodiment, when the valve rod moves and opens the valve, the fluid of valve rod chamber tip process need not through the damping hole, can not produce the effect of hysteresis hindrance to the valve rod removal for the valve can quick response. When the valve rod returns to the middle position, oil liquid in the valve rod control cavity at the corresponding end flows out to generate damping, and the return spring at the end generates acting force to act on the valve rod in a reaction mode, so that the valve rod is buffered when returning to the middle position.

The hydraulic control slide valve in the embodiment has three working positions, and can be applied to engineering machinery, such as a steering hydraulic system, control of a hydraulic oil cylinder in a working device or control of a hydraulic motor.

Claims (10)

1. A hydraulic control slide valve comprises a valve body and a valve rod positioned in a valve rod cavity of the valve body, wherein two ends of the valve rod cavity are respectively communicated with a control port; a reset spring is arranged between the sleeve body and the valve body, the reset spring applies elasticity towards the middle direction of the valve rod to the sleeve body, and a one-way throttle valve communicated with the end part of the valve rod cavity and the valve rod control cavity is arranged on the sleeve body.

2. A pilot operated slide valve according to claim 1 characterised in that the valve stem comprises a main stem and an end stem fixedly attached to the end of the main stem, the cylindrical side of the stem for clearance fit with the sleeve being provided on the end stem.

3. A pilot-operated spool valve according to claim 2, wherein the end rod is connected to the main valve rod by a screw-fit, the end rod is provided with a positioning shoulder for contact with an end surface of the main valve rod, a portion of the valve rod for abutment with the valve rod abutment portion is an end surface of the main valve rod, or a portion of the valve rod for abutment with the valve rod abutment portion is a step side surface of the positioning shoulder facing away from the end surface of the main valve rod.

4. A pilot-operated slide valve according to claim 3, characterised in that the end face of the end stem facing away from the main stem is provided with a regular polygonal counter bore.

5. The pilot operated spool valve according to claim 3 wherein the sleeve body is provided with a radial passage extending radially through the sleeve body at a position between the valve rod abutting portion and the valve body abutting portion.

6. The pilot operated slide valve according to any one of claims 1 to 5, wherein the check throttle valve comprises a check valve seat fixedly connected to an axial end portion of the sleeve body, a spring seat fixedly installed in an inner cavity of the check valve seat, a check spool installed in an inner cavity of the check valve composed of the check valve seat and the spring seat, and a spring provided between the check spool and the spring seat; and a damping hole for communicating the inner cavity of the one-way valve with the end part of the valve rod cavity is arranged on the one-way valve core or the one-way valve seat.

7. The pilot-operated slide valve according to claim 6, wherein the check valve seat is integrally formed with the sleeve body, or the check valve seat is fixedly connected to the sleeve body through an external thread.

8. The pilot-operated spool valve according to claim 6, wherein the check valve body is in the shape of a round steel ball, the spring seat is fixedly mounted in the check valve seat through an external thread, and the orifice is arranged on a circumferential side surface of the check valve seat.

9. The pilot operated spool valve according to claim 6, wherein the check valve body has a cylindrical side surface fitted to an inner cavity of the check valve seat and a tapered portion fitted to an oil supply passage on the check valve seat, and the orifice is disposed at a tip end of the tapered portion.

10. The pilot operated spool valve as set forth in claim 1, wherein the circumferential side of the sleeve body is provided with a step, the return spring is a coil spring and is fitted around the circumferential side of the sleeve body, and one end of the return spring abuts against the step side of the circumferential side of the sleeve body.

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