CN111894926B

CN111894926B - Safety valve of hydraulic support

Info

Publication number: CN111894926B
Application number: CN202010663855.8A
Authority: CN
Inventors: 陈定余; 陈永乐; 李学州; 唐大春
Original assignee: Yueqing Dongfeng Coal Mine Equipment Co ltd
Current assignee: Yueqing Dongfeng Coal Mine Equipment Co ltd
Priority date: 2020-07-10
Filing date: 2020-07-10
Publication date: 2022-04-29
Anticipated expiration: 2040-07-10
Also published as: CN111894926A

Abstract

The application relates to a safety valve of a hydraulic support, which comprises a valve shell, a joint arranged at one end of the valve shell, a valve core connected in the valve shell in a sliding manner, a spring seat fixedly arranged at one end, far away from the joint, of the valve core, a pressure regulating screw in the valve shell and positioned at one end, far away from the joint, of the valve shell, and a compression spring arranged between the pressure regulating screw and the spring seat; the joint is communicated with the interior of the valve shell, and the compression spring extrudes the valve core to one side of the joint so that the valve core is tightly attached to the communicated part of the joint and the valve shell; the valve core is provided with a first unloading hole, the joint is communicated with the first unloading hole, the valve shell is provided with a second unloading hole, and the second unloading hole is positioned on one side of the first unloading hole, which is far away from the joint; and the valve shell is also provided with a locking mechanism for fixing the position of the spring seat. This application has the effect that makes things convenient for the staff to change hold-down spring to the relief valve when hydraulic system operates.

Description

Safety valve of hydraulic support

Technical Field

The application relates to the field of safety valves in hydraulic systems, in particular to a safety valve of a hydraulic support.

Background

The hydraulic support is a structure used for controlling the mine pressure of the coal face, the hydraulic system is an important component of the hydraulic support, and the safety valve is used for protecting the hydraulic oil cylinder and unloading redundant load in time so as to prolong the service life of the hydraulic support.

At present, after the pressure spring in the relief valve is pressed for a long time, the elasticity of the pressure spring can be reduced along with the increase of time, the pressure spring can have the phenomenon that the elasticity is insufficient to ensure that the valve core cannot reset, the pressure of the pressure spring needs to be adjusted regularly through a pressure adjusting screw, and finally the pressure spring still needs to be replaced so as to ensure the normal use of the relief valve. When the hold-down spring is replaced, a hydraulic pipeline connected with the safety valve lock must be disconnected, and the valve core is prevented from being pushed to move under the action of pressure after the hold-down spring is taken down.

In view of the above-described related art, the inventors have considered that there is a drawback in that it is inconvenient to replace the pressure spring for the relief valve when the hydraulic system is operated.

Disclosure of Invention

Can change pressure spring to the relief valve for the convenience staff when hydraulic system operates, this application provides a hydraulic support's relief valve.

The application provides a relief valve of hydraulic support adopts following technical scheme:

a safety valve of a hydraulic support comprises a valve shell, a connector arranged at one end of the valve shell, a valve core connected in the valve shell in a sliding manner, a spring seat fixedly arranged at one end, far away from the connector, of the valve core, a pressure regulating screw in threaded connection with the valve shell and positioned at one end, far away from the connector, of the valve shell, and a compression spring arranged between the pressure regulating screw and the spring seat;

the joint is communicated with the interior of the valve shell, and the compression spring extrudes the valve core to one side of the joint so that the valve core is tightly attached to the communicated part of the joint and the valve shell;

the valve core is provided with a first unloading hole, the joint is communicated with the first unloading hole, the valve shell is provided with a second unloading hole, and the second unloading hole is positioned on one side of the first unloading hole, which is far away from the joint;

and the valve shell is also provided with a locking mechanism for fixing the position of the spring seat.

By adopting the technical scheme, the safety valve is connected in the hydraulic pipeline by using the joint, so that hydraulic oil in the hydraulic pipeline can enter the first unloading hole of the valve core from the joint, when the pressure in the hydraulic system exceeds the elastic force of the compression spring, the valve core is pushed by the hydraulic oil to move towards one side of the pressure regulating screw, and after the first unloading hole is aligned with the second unloading hole, the safety valve can be discharged from the second unloading hole together with the hydraulic oil, so that the pressure in the hydraulic system is reduced. When compression spring needs to be replaced, the position of the spring seat is fixed by using the locking mechanism, the spring seat can not be pushed by the valve core, namely, the valve core can not receive the pressure of hydraulic oil and move, the pressure regulating screw is unscrewed from the valve body at the moment, the compression spring can be replaced, in the process of replacing the compression screw, the valve core can not receive the pressure of the hydraulic oil and move, the normal work of a hydraulic system is ensured, the function of replacing the compression spring under the working state of the hydraulic system is realized, and the convenience of replacing the compression spring by the safety valve is improved.

Preferably, the locking mechanism comprises a plurality of push rods which are slidably connected to the side wall of the valve casing, a sliding sleeve which is sleeved on the valve casing and is slidably connected with the valve casing, and a driving piece which is arranged on the valve casing and is used for driving the sliding sleeve to slide;

the push rod is arranged along the radial direction of the valve shell, one end of the push rod is positioned in the valve shell and points to the side wall of the spring seat, and the other end of the push rod is positioned outside the valve shell and is abutted against the inner side wall of the sliding sleeve;

the inner side wall of the sliding sleeve is arranged in a conical surface with the diameter gradually reduced towards one side far away from the ejector rod;

the side wall of the spring seat along the circumferential direction of the spring seat is provided with a clamping groove which is arranged annularly, one end of the ejector rod, which is positioned in the valve shell, can extend into the clamping groove, and an elastic part which pushes the ejector rod to one side away from the spring seat is arranged between the ejector rod and the spring seat;

and a sliding rod is fixedly arranged between the spring seat and the valve core, and the diameter of the sliding rod is not more than that of the spring seat.

Through adopting above-mentioned technical scheme, when the relief valve is using, the ejector pin is located outside the draw-in groove, makes case can promote slide bar and spring holder and remove, and the slide bar then guarantees that the case can not interfere its motion because of the existence of a plurality of ejector pins. When changing compression spring, use the driving piece to drive the sliding sleeve and remove, make the sliding sleeve remove the in-process, diminish gradually with the diameter of ejector pin contact surface to press and move the ejector pin and remove to spring holder one side, until in the ejector pin stretches out the draw-in groove, the elastic component was compressed and hold up power this moment, and the spring holder receives the unable removal after the restriction of a plurality of ejector pins simultaneously, makes the case also unable removal, and the staff can unscrew the pressure regulating screw and take out compression spring and change. After the compression spring is replaced, the pressure regulating screw is screwed, the driving piece is used for driving the sliding sleeve to recover the initial position, the elastic piece drives the ejector rod to recover the initial position, the ejector rod is separated from the clamping groove, and the spring seat can continue to move, so that the safety valve can be normally used.

Preferably, the driving piece is set as a driving sleeve, the driving sleeve is sleeved on the outer side wall of the valve casing and is in threaded connection with the outer side wall, and the driving sleeve is in rotary connection with the sliding sleeve.

Through adopting above-mentioned technical scheme, rotate the drive sleeve, the drive sleeve can be along the axial displacement of valve casing to it slides to drive the sliding sleeve, and the operation is simple, and drive sleeve and valve casing threaded connection have from the locking nature, and it is more stable when making the sliding sleeve unmovable.

Preferably, the elastic component sets up to reset spring, one side that the ejector pin is located outside the valve casing has set firmly the limiting plate, reset spring cover is established on the ejector pin, just reset spring's one end and limiting plate butt, the other end and the lateral wall butt of valve casing.

Through adopting above-mentioned technical scheme, when the ejector pin removed to draw-in groove one side, drive the limiting plate and together remove, make the limiting plate promote reset spring to valve casing lateral wall one side, make reset spring compressed and hold power, the ejector pin plays the guide effect to reset spring simultaneously, can not produce great deformation when making the spring compressed. When the reset spring releases force, the limiting plate is pushed to move, and the limiting plate drives the ejector rod to move, so that the ejector rod is restored to the initial position.

Preferably, the limiting plate is arranged in an arc-shaped plate.

Through adopting above-mentioned technical scheme, reduce the space between the valve casing lateral wall and the sliding sleeve inside wall that occupy of limiting plate, improve the sliding sleeve and to the degree that compresses tightly of ejector pin, make overall structure comparatively compact stable.

Preferably, both ends of the ejector rod are arranged in a spherical manner.

Through adopting above-mentioned technical scheme, when making the sliding sleeve remove, it is less with the contact surface friction of ejector pin, makes the removal of sliding sleeve more smooth and easy, simultaneously, has still reduced the cross-sectional area of ejector pin tip, is favorable to the ejector pin to stretch into in the draw-in groove.

Preferably, one side that the joint was kept away from to the valve casing is threaded connection still has locking screw, locking screw threaded connection is in the valve casing, locking screw and the inseparable laminating of pressure regulating screw.

Through adopting above-mentioned technical scheme, locking screw plays locking effect to the pressure regulating screw, reduces the pressure regulating screw and rotates the phenomenon that leads to spring force to become loose because of the elasticity of spring.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the compression spring is replaced, the position of the spring seat is regulated by using the locking mechanism, so that the valve core cannot move due to the pressure of hydraulic oil, the compression spring in the safety valve can be replaced when the hydraulic system works, and the convenience of replacing the compression spring of the safety valve is improved;

2. the cooperation of adopting a plurality of ejector pins and draw-in groove realizes the function of spring holder fixed position, and simple structure is stable, convenient operation, and uses the slide bar to connect case and spring holder, guarantees that the ejector pin does not interfere the normal removal of case.

Drawings

FIG. 1 is a schematic view of the safety valve of the present embodiment;

fig. 2 is a sectional view showing an internal structure of a safety valve;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

FIG. 4 is a sectional view taken along line B-B in FIG. 2;

fig. 5 is a partial exploded view showing the positional relationship of the dust cap, the lock screw and the hold-down screw.

Description of reference numerals: 1. a valve housing; 11. a second relief hole; 2. a joint; 3. a valve core; 31. a first relief hole; 4. a pressure regulating screw; 41. a second protrusion; 5. a spring seat; 51. a first protrusion; 52. a card slot; 53. a slide bar; 6. a compression spring; 7. a locking mechanism; 71. a top rod; 72. a return spring; 73. a limiting plate; 74. a sliding sleeve; 75. a drive sleeve; 76. a guide block; 8. locking screws; 9. and a dust cover.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses hydraulic support's relief valve. Referring to fig. 1 and 2, the safety valve includes a valve housing 1, the valve housing 1 is formed in a hollow cylindrical shape, and both ends of the valve housing 1 are open. Connector 2 is installed to the one end of valve casing 1, connects 2 and the inside intercommunication of valve casing 1, connects 2 and is used for being connected with hydraulic line. One pot head that is close to joint 2 in valve casing 1 is equipped with case 3, and case 3 slides with valve casing 1 and is connected, and the one end butt of case 3 has seted up first off-load hole 31 on case 3 on the joint 2, connects 2 and first off-load hole 31 intercommunication, has seted up second off-load hole 11 on valve casing 1's the lateral wall, and second off-load hole 11 is located one side that joint 2 was kept away from to first off-load hole 31, and case 3 seals the opening in second off-load hole 11.

Referring to fig. 2, still be provided with pressure regulating screw 4 in valve casing 1, pressure regulating screw 4 is located valve casing 1 and keeps away from the one end of joint 2, and pressure regulating screw 4 cover is established in valve casing 1 rather than threaded connection. One end of the valve core 3 close to the pressure regulating screw 4 is provided with a spring seat 5, the cross section of the spring seat 5 is in a circular shape, the axis of the spring seat 5 coincides with the axis of the valve casing 1, and the diameter of the spring seat 5 is smaller than the inner diameter of the valve casing 1. A compression spring 6 is arranged between the spring seat 5 and the pressure regulating screw 4 in diameter, one end of the compression spring 6 is abutted against the spring seat 5, the other end of the compression spring 6 is abutted against the pressure regulating screw 4, a first bulge 51 is fixedly arranged at one end of the spring seat 5 close to the pressure regulating screw 4, and one end of the compression spring 6, which is in contact with the spring seat 5, is sleeved on the first bulge 51; one end of the pressure regulating screw 4 close to the spring seat 5 is fixedly provided with a second bulge 41, and one end of the pressure regulating screw 6 contacting with the pressure regulating screw 4 is sleeved on the second bulge 41. Since the pressure adjusting screw 4 is screwed to the valve housing 1, the pressure spring 6 presses the spring seat 5 and the valve element 3 toward the joint 2, and the valve element 3 abuts on the joint 2. Still be provided with locking mechanism 7 on the valve casing 1, locking mechanism 7 can fix the position of spring holder 5, makes spring holder 5 unable in valve casing 1 removal.

When the pressure in the hydraulic system exceeds the elastic force of the compression spring 6, the valve core 3 is pushed to move towards one side of the compression screw, the compression spring 6 is gradually compressed to accumulate force in the moving process of the valve core 3, after the first unloading hole 31 in the valve core 3 is aligned with the second unloading hole 11 in the valve shell 1, hydraulic oil flows out of the safety valve through the first unloading hole 31 and the second unloading hole 11, the pressure in the hydraulic system is reduced, and after the pressure in the hydraulic system is recovered to be normal, the compression spring 6 pushes the spring seat 5 and the valve core 3 to recover the initial position, so that the hydraulic system can continue to work normally.

After the elasticity of the compression spring 6 is reduced, the pressure regulating screw 4 is rotated to enable the pressure regulating screw 4 to move in the valve shell 1, when the pressure regulating screw 4 moves to one side close to the valve core 3, the compression spring 6 is compressed to accumulate force, otherwise, the compression spring 6 extends, and therefore the function of adjusting the elasticity of the compression spring 6 is achieved.

When compression spring 6 needs to be changed, at first use locking mechanism 7 with the position of spring holder 5 fixed, make spring and case 3 all unable removal, rotate pressure regulating screw 4 again, take out pressure regulating screw 4 from valve casing 1, make the one end opening of valve casing 1 spill, can take out compression spring 6 from valve casing 1 in, change compression spring 6. Because case 3 and spring holder 5 all can't remove, open pressure regulating screw 4 back, case 3 can not remove because of receiving the pressure of hydraulic oil in the hydraulic pressure pipeline to make the relief valve also can change work to pressure spring 6 under hydraulic system operating condition, improve the convenience when pressure spring 6 is changed to the relief valve.

Referring to fig. 2 and 3, the locking mechanism 7 includes a plurality of push rods 71 disposed on the valve housing 1, the push rods 71 are disposed along the radial direction of the valve housing 1, the plurality of push rods 71 are uniformly distributed along the circumferential direction of the valve housing 1, the push rods 71 penetrate through the valve housing 1 and are connected with the valve housing in a sliding manner, two ends of the push rods 71 are disposed in a spherical shape, one end of each push rod 71 located in the valve housing 1 is spaced from the spring seat 5, and the plurality of push rods 71 are located on one side of the second unloading hole 11 away from the first unloading hole 31.

Referring to fig. 3 and 4, a clamping groove 52 is formed in a side wall of the spring seat 5 along the circumferential direction, the clamping groove 52 is annularly arranged, the push rod 71 corresponds to the clamping groove 52, one end, located in the valve housing 1, of the push rod 71 can slide into the clamping groove 52, an elastic member is arranged between the push rod 71 and the spring seat 5, and the push rod 71 is kept separated from the spring seat 5 under the action of the elastic member.

Referring to fig. 2, a slide rod 53 is provided between the spring seat 5 and the valve body 3, the diameter of the slide rod 53 is smaller than that of the spring seat 5, one end of the slide rod 53 is fixedly connected to the valve body 3, and the other end is fixedly connected to the spring seat 5, so that the slide rod 53 can smoothly pass between the plurality of lift pins 71 when the valve body 3 moves, and the plurality of lift pins 71 do not interfere with the movement of the valve body 3.

Referring to fig. 3 and 4, the elastic member is set to return spring 72, one side of ejector rod 71 outside valve housing 1 has set firmly limiting plate 73, limiting plate 73 is the arc setting, the axis of limiting plate 73 is parallel with the axis of valve housing 1, return spring 72 is located between limiting plate 73 and the valve housing 1 lateral wall, and return spring 72 cover is established on ejector rod 71, return spring 72's one end and limiting plate 73 butt, the other end and the lateral wall butt of valve housing 1. Since the valve housing 1 is kept in a fixed state, the return spring 72 presses the stopper plate 73 to the side away from the spring seat 5, and the stopper plate 73 drives the lift rod 71 to keep the state of being separated from the spring seat 5.

Referring to fig. 2 and 3, the outer side wall of the valve housing 1 is sleeved with a sliding sleeve 74, the sliding sleeve 74 is connected with the valve housing 1 in a sliding manner, one end of the push rod 71, which is located outside the valve housing 1, abuts against the inner side wall of the sliding sleeve 74, the inner side wall of the sliding sleeve 74 is arranged in a conical surface manner, and the diameter of one side, away from the push rod 71, of the inner diameter of the sliding sleeve 74 is gradually reduced. The valve housing 1 is further provided with a driving member for driving the sliding sleeve 74 to slide on the valve housing 1.

Referring to fig. 2 and 3, the driving member is provided as a driving sleeve 75, the driving sleeve 75 is sleeved on the valve housing 1 and is in threaded connection therewith, the driving sleeve 75 is located on one side of the sliding sleeve 74 close to the top rod 71, and one end of the sliding sleeve 74 is rotatably connected with the driving sleeve 75. The drive sleeve 75 is rotated, and the drive sleeve 75 moves on the valve housing 1, thereby sliding the sliding sleeve 74 on the valve housing 1.

When the spring seat 5 needs to be locked, the driving sleeve 75 is rotated, so that the driving sleeve 75 drives the sliding sleeve 74 to move towards one side close to the joint 2, and in the moving process of the sliding sleeve 74, the diameter of the contact surface with the ejector rod 71 gradually decreases, so that the ejector rod 71 is pushed towards one side of the spring seat 5, and the ejector rod 71 gradually extends into the clamping groove 52 of the spring seat 5. After the push rod 71 extends into the clamping groove 52 of the spring seat 5, the spring seat 5 cannot move along the axial direction of the valve housing 1 after being limited by the push rod 71, and the function of fixing the position of the spring seat 5 is realized.

Referring to fig. 2 and 5, one side of the pressure regulating screw 4, which is far away from the valve core 3, is further provided with a locking screw 8, the locking screw 8 is also in threaded connection in the valve housing 1, and the locking screw 8 is tightly attached to the pressure regulating screw 4. The locking screw 8 plays a role in loosening the pressure regulating screw 4.

Referring to fig. 2 and 5, one side cover that connector 2 was kept away from to valve casing 1 is equipped with shield 9, and shield 9 is the sleeve setting of one end confined, and shield 9 lock makes shield 9 close telescopic opening end on valve casing 1, makes inside dust is difficult for getting into valve casing 1.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The safety valve of the hydraulic support is characterized in that: the pressure regulating valve comprises a valve casing (1), a connector (2) arranged at one end of the valve casing (1), a valve core (3) connected in the valve casing (1) in a sliding manner, a spring seat (5) fixedly arranged at one end, far away from the connector (2), of the valve core (3), a pressure regulating screw (4) in the valve casing (1) in a threaded manner and positioned at one end, far away from the connector (2), of the valve casing (1), and a compression spring (6) arranged between the pressure regulating screw (4) and the spring seat (5);

the joint (2) is communicated with the interior of the valve shell (1), and the compression spring (6) extrudes the valve core (3) to one side of the joint (2) to ensure that the valve core (3) is tightly attached to the communicated part of the joint (2) and the valve shell (1);

a first unloading hole (31) is formed in the valve core (3), the joint (2) is communicated with the first unloading hole (31), a second unloading hole (11) is formed in the valve shell (1), and the second unloading hole (11) is located on one side, far away from the joint (2), of the first unloading hole (31);

and the valve casing (1) is also provided with a locking mechanism (7) for fixing the position of the spring seat (5).

2. The safety valve of a hydraulic mount of claim 1, wherein: the locking mechanism (7) comprises a plurality of push rods (71) which are connected to the side wall of the valve casing (1) in a sliding manner, a sliding sleeve (74) which is sleeved on the valve casing (1) and connected with the valve casing in a sliding manner, and a driving piece which is arranged on the valve casing (1) and used for driving the sliding sleeve (74) to slide;

the push rod (71) is arranged along the radial direction of the valve casing (1), one end of the push rod (71) is positioned in the valve casing (1) and points to the side wall of the spring seat (5), and the other end of the push rod (71) is positioned outside the valve casing (1) and is abutted against the inner side wall of the sliding sleeve (74);

the inner side wall of the sliding sleeve (74) is arranged in a conical surface with the diameter gradually reduced towards the side far away from the ejector rod (71);

the side wall of the spring seat (5) along the circumferential direction is provided with a clamping groove (52) which is annularly arranged, one end of the ejector rod (71) positioned in the valve shell (1) can extend into the clamping groove (52), and an elastic part which pushes the ejector rod (71) to one side far away from the spring seat (5) is arranged between the ejector rod (71) and the spring seat (5);

a sliding rod (53) is fixedly arranged between the spring seat (5) and the valve core (3), and the diameter of the sliding rod (53) is not larger than that of the spring seat (5).

3. The safety valve of a hydraulic mount of claim 2, wherein: the driving piece is set as a driving sleeve (75), the driving sleeve (75) is sleeved on the outer side wall of the valve casing (1) and is in threaded connection with the outer side wall, and the driving sleeve (75) is in rotating connection with the sliding sleeve (74).

4. The safety valve of a hydraulic mount of claim 2, wherein: the elastic component sets up to reset spring (72), one side that ejector pin (71) are located valve casing (1) outside has set firmly limiting plate (73), reset spring (72) cover is established on ejector pin (71), just reset spring (72)'s one end and limiting plate (73) butt, the other end and the lateral wall butt of valve casing (1).

5. The safety valve of a hydraulic mount of claim 4, wherein: the limiting plate (73) is arranged in an arc-shaped plate.

6. The safety valve of a hydraulic mount of claim 2, wherein: the two ends of the ejector rod (71) are arranged in a spherical manner.

7. The safety valve of a hydraulic mount according to any one of claims 1 to 6, wherein: one side that connector (2) were kept away from in valve casing (1) still threaded connection has locking screw (8), locking screw (8) threaded connection is in valve casing (1), locking screw (8) and pressure regulating screw (4) closely laminate.