CN215109770U

CN215109770U - Special pressure control system for unloading valve

Info

Publication number: CN215109770U
Application number: CN202121190275.8U
Authority: CN
Inventors: 张晞; 郑子勤; 牛梦奇; 王忠凯; 卞海龙
Original assignee: Wuxi Coal Mine Machinery Co ltd; China University of Mining and Technology Beijing CUMTB
Current assignee: Wuxi Coal Mine Machinery Co ltd; China University of Mining and Technology Beijing CUMTB
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-12-10
Anticipated expiration: 2031-05-28

Abstract

The utility model relates to a special pressure control system for an unloading valve, which comprises an unloading valve main body and a pressure control assembly matched with the upper end of the unloading valve main body; the structure of the pressure control assembly is as follows: the unloading valve comprises a platform, wherein the lower surface of the platform is attached to the upper surface of an unloading valve main body, one end of the upper surface of the platform is provided with a guide rail, the other end of the upper surface of the platform is fixedly connected with a base plate, a power device is arranged above the base plate, the output end of the power device is provided with an executing mechanism, the power device controls the translation action of the executing mechanism, the output end of the executing mechanism is connected with a pilot valve component positioned in the unloading valve main body, and the executing mechanism controls the pilot valve component to move up and down; the problems of serious abrasion and high processing and maintenance cost of the existing electromagnetic ball valve are solved, and the pressure of the ultrahigh-pressure high-flow emulsion pump station can be reliably controlled.

Description

Special pressure control system for unloading valve

Technical Field

The utility model belongs to the technical field of hydraulic control equipment technique and specifically relates to a special pressure control system of uninstallation valve.

Background

The emulsion pump station is a power device for supplying liquid to the hydraulic support of the fully mechanized mining face support device, and the working reliability of the emulsion pump station directly determines the safety of the fully mechanized mining face operation. With the wide introduction of super large mining height type hydraulic support equipment in coal mines, the emulsion pump station also shows the trend of developing to high-pressure large-flow pump station, and the solution feed flow and pressure increase, the pressure control problem of emulsion pump station is awaited to solve. At present, the pressure control types of emulsion pump stations are divided into three major categories: and (4) adjusting the variable pump, controlling the overflow valve and controlling the unloading valve. The variable pump regulation and overflow valve control based on the variable pump is rarely adopted in actual production due to the fact that the production cost is high, the structure is complex, and the regulation precision is poor or the energy consumption is high due to the fact that the control is easily influenced by pulses.

The pressure control system based on the unloading valve is widely applied to pressure control of a coal mine emulsion pump station due to less energy consumption, long service life and reliable operation. The most common pressure control technology of the unloading valve adopts an electromagnetic pilot valve as a pressure control device for controlling the opening and closing of a main valve. In production, the frequent action of the electromagnetic pilot valve and the emulsion impurities can cause the service life of the unloading valve to be low, and the unloading valve needs to be driven by larger electromagnetic force on occasions of an ultrahigh-pressure and ultra-large-flow emulsion pump station, so that the volume of the unloading valve is greatly increased.

SUMMERY OF THE UTILITY MODEL

The applicant provides a special pressure control system for an unloading valve aiming at the defects in the prior art, thereby solving the problems of serious abrasion and high processing and maintenance cost of the prior electromagnetic ball valve and reliably controlling the pressure of an ultrahigh-pressure large-flow emulsion pump station.

The utility model discloses the technical scheme who adopts as follows:

a pressure control system special for an unloading valve comprises an unloading valve main body and a pressure control assembly matched with the upper end of the unloading valve main body;

the structure of the pressure control assembly is as follows: the unloading valve comprises a platform, the lower surface of platform and the upper surface subsides of uninstallation valve main part are connected, the one end installation guide rail of platform upper surface, other end rigid coupling backing plate, power device is installed to the backing plate top, power device's output installation actuating mechanism, power device control actuating mechanism's translation action, actuating mechanism's output connection is located the inside pilot valve subassembly of uninstallation valve main part, and actuating mechanism controls the pilot valve subassembly and moves from top to bottom.

As a further improvement of the above technical solution:

the power device adopts a hydraulic cylinder, an air cylinder or an electric push rod assembly.

The executing mechanism adopts a gear rack mechanism, a wedge mechanism, a crank connecting rod mechanism or a cam mechanism.

The structure of the cam mechanism is as follows: including the sideslip mechanism and the gyro wheel mechanism that mutually support, one side and the power device rigid coupling of sideslip mechanism to through the support location on the guide rail, make the sideslip mechanism slide along the guide rail under power device's drive, set up the first through-hole that is used for scarf joint gyro wheel mechanism on the platform, set up the heavy groove corresponding with first through-hole position in the uninstallation valve main part, the embedded pilot valve subassembly that is equipped with in heavy groove, the top of pilot valve subassembly and gyro wheel mechanism's bottom butt.

The specific structure of the pilot valve assembly is as follows: the pilot valve comprises a pilot valve body, wherein a first channel hole is formed in the upper end of the pilot valve body in the axial direction, a pilot valve spool is arranged in the first channel hole in a sliding mode, the middle of the pilot valve body contracts inwards in the radial direction to form a pilot valve seat used for limiting the movement position of the pilot valve spool, a second channel hole is formed in the lower end of the pilot valve body in the axial direction, a damping valve is embedded in the second channel hole, a first channel is formed in the center of the damping valve, a third channel hole is further formed in the pilot valve body between the first channel hole and the second channel hole, the upper end of the third channel hole is communicated with the first channel hole, the lower end of the third channel hole is communicated with the first channel, a second channel vertically penetrating through the first channel hole is formed in the side wall of the pilot valve body, and a third channel vertically penetrating through the third channel hole is formed in the side wall of the pilot valve body.

The pilot valve spool is of a cylindrical structure, and the end part of the pilot valve spool, which is positioned at one end of the pilot valve seat, is also contracted along the radial direction to form a conical surface matched with the pilot valve seat.

The first channel hole, the second channel hole and the third channel hole are symmetrically formed along the central axis of the pilot valve body, the pilot valve spool and the damping valve are coaxially arranged, the sealing rings are embedded in the inner wall surface of the first channel hole, and the plurality of sealing rings are also embedded in the outer wall of the pilot valve body.

The structure of the transverse moving mechanism is as follows: the cam rack is of a square structure, a mounting groove for embedding a cam block is formed in the lower surface of the cam rack, a disc spring is further arranged between the upper surface of the cam block and the mounting groove, a second through hole is formed in the middle of the upper surface of the cam rack, positioning holes are formed in two sides of the second through hole respectively, a positioning pin is screwed into the cam block through the positioning holes, and a connecting bolt is screwed into the cam block through the second through hole; the upper surface of the cam block is a horizontal plane, the lower surface of the cam block is a curved surface matched with the roller mechanism, the two sides of the curved surface are of plane structures which are arranged in parallel from top to bottom, and the middle of the curved surface is of an S-shaped cambered surface structure in gentle transition.

The structure of the roller mechanism is as follows: the device comprises a support shaft and a support shaft, wherein the bottom of the support shaft is contacted with the top of a pilot valve assembly, the upper end of the support shaft is provided with a roller groove for mounting a roller, the two ends of the support shaft are fixedly connected with the groove wall of the roller groove respectively and are fastened through a clamp spring, and the roller is rotationally positioned on the support shaft; and a rolling bearing is further arranged between the roller and the supporting shaft, and a guide sleeve for guiding the roller to rotate is sleeved on the supporting shaft.

The cam frame is provided with a mounting groove corresponding to the position of the push-pull rod of the electric push rod assembly, the wall of the mounting groove is symmetrically provided with bolt holes, the end part of the push-pull rod extends into the mounting groove, and the fastening pin penetrates through the bolt holes and penetrates through the end part of the push-pull rod to fixedly connect the push-pull rod with the cam frame.

The utility model has the advantages as follows:

the utility model has the advantages of compact and reasonable structure, convenient operation, at unloading valve main part upper portion installation pressure control assembly, including cam pack, pilot valve subassembly and electric putter subassembly, through cam pack's sideslip mechanism and cam mechanism cooperation, adjust the pilot valve case position of pilot valve subassembly, control the intercommunication and the disconnection of second runner and third runner to the pressure of control pressure relief valve main valve epicoele, after unloading valve working hole pressure is greater than unloading valve rated pressure, make the working hole and the overflow mouth intercommunication of pressure relief valve accomplish the off-load; after the pressure of the working port of the unloading valve is reduced to the pressure recovery of the unloading valve, the working port of the unloading valve is disconnected with the overflow port to complete pressure building, the pressure of the unloading valve can be effectively controlled in time through the device, the pressure fluctuation is small, the reliability is high, zero-pressure starting can be realized, and the processing and maintenance cost is low.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is a schematic structural diagram of the pilot valve assembly of the present invention.

Fig. 4 is a cross-sectional view of fig. 3.

Fig. 5 is a schematic structural view of the cam assembly traversing mechanism of the present invention.

Fig. 6 is a cross-sectional view of fig. 5.

Fig. 7 is a schematic structural diagram of the cam assembly roller mechanism of the present invention.

Wherein: 1. unloading the valve body; 2. a platform; 3. a guide rail; 4. a support; 5. a cam mechanism; 6. an electric push rod assembly; 7. a base plate; 8. a pilot valve assembly;

201. a first through hole;

501. a cam carrier; 502. a second through hole; 503. a connecting bolt; 504. positioning holes; 505. positioning pins; 506. a cam block; 507. a disc spring; 508. mounting grooves; 509. a pin hole; 510. installing a groove; 511. a support bar; 512. a roller groove; 513. a rolling bearing; 514. a guide sleeve; 515. a roller; 516. a clamp spring; 517. a support shaft;

601. a push-pull rod;

801. a pilot valve body; 802. a seal ring; 803. a third passage hole; 804. a damping valve; 805. a first flow passage; 806. a second passage hole; 807. a third flow path; 808. a pilot valve seat; 809. a second flow passage; 810. a first passage hole; 811. a pilot valve spool.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1-7, the pressure control system dedicated for the unloading valve of the present embodiment includes an unloading valve main body 1, and a pressure control assembly engaged with an upper end of the unloading valve main body 1;

the structure of the pressure control assembly is as follows: the unloading valve comprises a platform 2, wherein the lower surface of the platform 2 is attached to the upper surface of an unloading valve main body 1, a guide rail 3 is installed at one end of the upper surface of the platform 2, the other end of the upper surface of the platform is fixedly connected with a base plate 7, a power device is installed above the base plate 7, an execution mechanism is installed at the output end of the power device, the power device controls the translation action of the execution mechanism, the output end of the execution mechanism is connected with a pilot valve component 8 located inside the unloading valve main body 1, and the execution mechanism controls the pilot valve component 8 to move up and down.

The power device adopts a hydraulic cylinder, an air cylinder or an electric push rod assembly 6.

The actuating mechanism adopts a gear rack mechanism, a wedge mechanism, a crank link mechanism or a cam mechanism 5.

The cam mechanism 5 has the structure: including the sideslip mechanism and the gyro wheel mechanism of mutually supporting, one side and the power device rigid coupling of sideslip mechanism, and be located guide rail 3 through support 4, make sideslip mechanism slide along guide rail 3 under power device's drive, set up the first through-hole 201 that is used for scarf joint gyro wheel mechanism on the platform 2, set up the heavy groove corresponding with first through-hole 201 position on the uninstallation valve main part 1, the embedded pilot valve subassembly 8 that is equipped with in heavy groove, the top of pilot valve subassembly 8 and gyro wheel mechanism's bottom butt.

The specific structure of the pilot valve assembly 8 is: the pilot valve comprises a pilot valve body 801, wherein a first channel hole 810 is formed in the upper end of the pilot valve body 801 in the axial direction, a pilot valve spool 811 is slidably mounted in the first channel hole 810, the middle of the pilot valve body 801 contracts inwards in the radial direction to form a pilot valve seat 808 used for limiting the movement position of the pilot valve spool 811, a second channel hole 806 is formed in the lower end of the pilot valve body 801 in the axial direction, a damping valve 804 is embedded in the second channel hole 806, a first flow channel 805 is formed in the center of the damping valve 804, a third channel hole 803 is further formed in the pilot valve body 801 between the first channel hole 810 and the second channel hole 806, the upper end of the third channel hole 803 is communicated with the first channel hole 810, the lower end of the third channel hole 803 is communicated with the first flow channel 805, a second channel 809 vertically penetrating through the first channel hole 810 is formed in the side wall of the pilot valve body 801, and a third channel 807 vertically penetrating through the third channel hole 803.

The pilot valve spool 811 has a cylindrical structure, and the end of the pilot valve spool 811 located at one end of the pilot valve seat 808 is also radially contracted to form a conical surface that is engaged with the pilot valve seat 808.

The first channel hole 810, the second channel hole 806 and the third channel hole 803 are all symmetrically formed along the central axis of the pilot valve body 801, the pilot valve spool 811 and the damping valve 804 are coaxially arranged, the sealing ring 802 is embedded in the inner wall surface of the first channel hole 810, and a plurality of sealing rings 802 are also embedded in the outer wall of the pilot valve body 801.

The structure of the transverse moving mechanism is as follows: the cam rack 501 is of a square structure, the lower surface of the cam rack 501 is provided with an installation groove 508 for embedding a cam block 506, a disc spring 507 is further arranged between the upper surface of the cam block 506 and the installation groove 508, the middle part of the upper surface of the cam rack 501 is provided with a second through hole 502, two sides of the second through hole 502 are respectively provided with a positioning hole 504, a positioning pin 505 is screwed into the cam block 506 through the positioning hole 504, and a connecting bolt 503 is screwed into the cam block 506 through the second through hole 502; the upper surface of the cam block 506 is a horizontal plane, the lower surface of the cam block 506 is a curved surface matched with the roller mechanism, the two sides of the curved surface are of a plane structure which is arranged in parallel up and down, and the middle of the curved surface is of an S-shaped cambered surface structure in gentle transition.

The structure of the roller mechanism is as follows: the hydraulic pilot valve comprises a support rod 511, wherein the bottom of the support rod 511 is in contact with the top of a pilot valve component 8, the upper end of the support rod 511 is provided with a roller groove 512 for mounting a roller 515, the hydraulic pilot valve also comprises a support shaft 517, two ends of the support shaft 517 are respectively fixedly connected with the groove wall of the roller groove 512 and are fastened through a clamp spring 516, and the roller 515 is rotatably positioned on the support shaft 517; a rolling bearing 513 is further installed between the roller 515 and the supporting shaft 517, and a guide sleeve 514 for guiding the roller 515 to rotate is sleeved on the supporting shaft 517.

The cam rack 501 is provided with a mounting groove 510 corresponding to the position of the push-pull rod 601 of the electric push rod assembly 6, the wall of the mounting groove 510 is symmetrically provided with bolt holes 509, the end part of the push-pull rod 601 extends into the mounting groove 510, and a fastening pin penetrates through the bolt holes 509 and the end part of the push-pull rod 601, so that the push-pull rod 601 is fixedly connected with the cam rack 501.

The utility model discloses a release process as follows:

the utility model discloses when being in non-off-load state, pilot valve case 811 lower extreme bears the liquid pressure that the uninstallation valve supplied the liquid mouth to ascending after first runner 805 to for wheel components's bracing piece 511 provides ascending thrust, disc spring 507 is in compression state this moment, guarantees that pilot valve case 811 compresses tightly all the time on pilot valve disk seat 808. When the pressure of the liquid supply port of the unloading valve is higher than the rated unloading pressure, the electric signal transmitted to the motor control system by the pressure sensor is higher than a set threshold value, the motor control system controls the push-pull rod 601 to retract leftwards, and the transverse moving mechanism connected with the electric push rod assembly 6 moves leftwards horizontally. The support bar 511 is moved upward by the hydraulic pressure of the lower end surface until the surface of the roller 515 is in contact with the lower surface of the cam block 506 and the disc spring 507 is in a compressed state. At this time, the second flow passage 809 of the pilot valve assembly 8 communicates with the third flow passage 807, and the unload valve main valve upper chamber liquid flows into the unload port, so that the main valve upper chamber pressure decreases, and the main valve is opened by the upper and lower surface pressure difference, thereby completing the unload.

The utility model discloses a build the pressure process as follows:

when the pressure of the liquid supply port of the unloading valve reaches the recovery pressure, an electric signal transmitted to the motor control system by the pressure sensor is lower than a set threshold value, the motor control system controls the push-pull rod 601 to extend rightward, the transverse moving mechanism connected with the electric push rod assembly 6 horizontally moves rightward, the supporting rod 511 is extruded to move downward, the pilot valve spool 811 is pressed on the pilot valve seat 808, and the disc spring 507 keeps a compressed state. At this time, the second flow passage 809 and the third flow passage 807 of the pilot valve assembly 8 are disconnected, so that the upper main valve cavity of the unloading valve is disconnected from the overflow port, high-pressure fluid at the fluid supply port flows into the upper main valve cavity of the unloading valve through the damping valve 804, the pressure of the upper main valve cavity is continuously increased until the main valve core is closed, the fluid supply port is disconnected from the overflow port, and the high-pressure fluid pushes the one-way valve open to flow into the working port to complete pressure building.

The above description is for the purpose of explanation and not limitation of the invention, which is defined in the claims, and any modifications may be made within the scope of the invention.

Claims

1. The special pressure control system of unloading valve, its characterized in that: comprises an unloading valve main body (1) and a pressure control assembly matched with the upper end of the unloading valve main body (1);

the structure of the pressure control assembly is as follows: including platform (2), the lower surface of platform (2) and the upper surface subsides of uninstallation valve main part (1) connect, guide rail (3) are installed to the one end of platform (2) upper surface, other end rigid coupling backing plate (7), power device is installed to backing plate (7) top, power device's output installation actuating mechanism, power device control actuating mechanism's translation action, actuating mechanism's output is connected and is located pilot valve subassembly (8) of uninstallation valve main part (1) inside, and actuating mechanism control pilot valve subassembly (8) acts from top to bottom.

2. The pressure control system dedicated to the unloader valve of claim 1, wherein: the power device adopts a hydraulic cylinder, an air cylinder or an electric push rod assembly (6).

3. The pressure control system dedicated to the unloader valve of claim 1, wherein: the executing mechanism adopts a gear rack mechanism, a wedge mechanism, a crank connecting rod mechanism or a cam mechanism (5).

4. The pressure control system dedicated to the unloader valve of claim 3, wherein: the structure of the cam mechanism (5) is as follows: including the sideslip mechanism and the gyro wheel mechanism of mutually supporting, one side and the power device rigid coupling of sideslip mechanism to be located guide rail (3) through support (4), make the sideslip mechanism slide along guide rail (3) under power device's drive, set up first through-hole (201) that are used for scarf joint gyro wheel mechanism on platform (2), set up on uninstallation valve main part (1) with first through-hole (201) position corresponding heavy groove, the embedded pilot valve subassembly (8) that is equipped with in heavy groove, the top of pilot valve subassembly (8) and gyro wheel mechanism's bottom butt.

5. The pressure control system dedicated to the unloader valve of claim 1, wherein: the pilot valve assembly (8) has the following specific structure: the pilot valve comprises a pilot valve body (801), wherein a first channel hole (810) is formed in the upper end of the pilot valve body (801) along the axial direction, a pilot valve spool (811) is installed in the first channel hole (810) in a sliding mode, the middle of the pilot valve body (801) contracts inwards along the radial direction to form a pilot valve seat (808) used for limiting the movement position of the pilot valve spool (811), a second channel hole (806) is formed in the lower end of the pilot valve body (801) along the axial direction, a damping valve (804) is embedded in the second channel hole (806), a first flow channel (805) is formed in the center of the damping valve (804), a third channel hole (803) is further formed in the pilot valve body (801) between the first channel hole (810) and the second channel hole (806), the upper end of the third channel hole (803) is communicated with the first channel hole (810), and the lower end of the third channel hole (803) is communicated with the first flow channel (805), a second flow passage 809 vertically penetrating through the first passage hole 810 and a third flow passage 807 vertically penetrating through the third passage hole 803 are formed in the side wall of the pilot valve body 801.

6. The pressure control system dedicated to the unloader valve of claim 5, wherein: the pilot valve spool (811) is of a cylindrical structure, and the end part of the pilot valve spool (811) positioned at one end of the pilot valve seat (808) is also radially contracted to form a conical surface matched with the pilot valve seat (808).

7. The pressure control system dedicated to the unloader valve of claim 5, wherein: first passageway hole (810), second passageway hole (806) and third passageway hole (803) all set up along the center pin symmetry of pilot valve body (801), and pilot valve case (811) and damping valve (804) coaxial setting, and sealing washer (802) are inlayed to the internal wall face in first passageway hole (810), and sealing washer (802) are also inlayed to the outer wall of pilot valve body (801).

8. The pressure control system dedicated to the unloader valve of claim 4, wherein: the structure of the transverse moving mechanism is as follows: the cam rack comprises a cam rack (501), wherein the cam rack (501) is of a square structure, a mounting groove (508) for embedding a cam block (506) is formed in the lower surface of the cam rack (501), a disc spring (507) is further arranged between the upper surface of the cam block (506) and the mounting groove (508), a second through hole (502) is formed in the middle of the upper surface of the cam rack (501), positioning holes (504) are formed in two sides of the second through hole (502), a positioning pin (505) is screwed into the cam block (506) through the positioning holes (504), and a connecting bolt (503) is screwed into the cam block (506) through the second through hole (502); the upper surface of the cam block (506) is a horizontal plane, the lower surface of the cam block (506) is a curved surface matched with the roller mechanism, two sides of the curved surface are of plane structures which are arranged in parallel up and down, and the middle of the curved surface is of an S-shaped cambered surface structure in gentle transition; the cam rack (501) is provided with a mounting groove (510), the groove walls of the mounting groove (510) are symmetrically provided with bolt holes (509), the end part of the push-pull rod (601) extends into the mounting groove (510), and a fastening pin penetrates through the bolt holes (509) and penetrates through the end part of the push-pull rod (601), so that the push-pull rod (601) is fixedly connected with the cam rack (501).

9. The pressure control system dedicated to the unloader valve of claim 4, wherein: the structure of the roller mechanism is as follows: the device comprises a supporting rod (511), wherein the bottom of the supporting rod (511) is in contact with the top of a pilot valve assembly (8), the upper end of the supporting rod (511) is provided with a roller groove (512) for mounting a roller (515), the device also comprises a supporting shaft (517), two ends of the supporting shaft (517) are fixedly connected with the groove wall of the roller groove (512) respectively and are fastened through a clamp spring (516), and the roller (515) is rotationally positioned on the supporting shaft (517); and a rolling bearing (513) is further installed between the roller (515) and the supporting shaft (517), and a guide sleeve (514) for guiding the rotation of the roller (515) is sleeved on the supporting shaft (517).