Precise control method and device for pressure regulating valve

Abstract

The invention discloses a precise control method and device for a pressure regulating valve, and relates to the technical field of pressure regulation, the precise control device comprises a valve body and a valve seat fixedly connected in the valve body, a valve rod is further arranged in the valve body, the valve rod is controlled through a driving part, one end of the valve rod is in threaded connection with a valve element, and the other end of the valve element is in threaded connection with a valve rod. A liftable adjusting rod is arranged at the bottom of the valve body, and a disassembly structure matched with the valve element is arranged on the adjusting rod. By means of the dismounting structure, the push plate and the drawing structure, the valve seat can be well sealed in the using process, leakage is avoided, the valve element can be dismounted in the sealing process of the valve seat, the functionality is higher, use is easier and more convenient, and the practicability is high. And the valve element can be stably pulled out of the interior of the valve body under the cooperation of the push plate and the pulling structure, dismounting and taking out are easier and more convenient, the structure is simple, and the production cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure regulation, and in particular to a method and device for accurately controlling a pressure regulating valve. Background Art

[0002] A pressure regulating valve is a device used to regulate and control the pressure of a fluid system. It is usually installed in a pipeline system and can automatically adjust the valve opening according to the set pressure value or control signal, thereby achieving precise regulation and control of the pressure. A pressure regulating valve can maintain the stability of the system pressure and prevent damage to equipment and processes caused by excessive or low pressure. The structure generally includes a valve body, a valve core, a valve seat, a regulating mechanism, etc., and can adapt to different application scenarios and pressure regulation requirements through different designs and working principles.

[0003] Although the existing pressure regulating valves have achieved precise control with the cooperation of multiple precision electronic components, their internal valve cores will be affected by the fluid in the pipeline after long-term use, and are prone to varying degrees of wear and damage, thereby having a certain impact on the precise control of the regulating valve. However, when replacing the valve core, it is often necessary to disassemble the entire valve body before replacing the valve core, which is inconvenient, time-consuming and labor-intensive. Therefore, the present application provides a method and device for precise control of a pressure regulating valve to meet the needs. Summary of the invention

[0004] The purpose of the present application is to provide a method and device for accurately controlling a pressure regulating valve, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a precise control device for a pressure regulating valve, comprising a valve body and a valve seat fixedly connected to the valve body, a valve stem is further arranged inside the valve body, the valve stem is controlled by a driving unit, and a valve core is threadedly connected to one end of the valve stem, a lifting and lowering regulating rod is arranged at the bottom of the valve body, a disassembly structure matched with the valve core is arranged on the regulating rod, a push plate matched with the valve core is further arranged inside the valve body, and a pulling and pulling structure for driving the push plate to slide is further arranged inside the valve body; The driving part is mounted on the valve body through a mounting seat; The adjusting rod can drive the disassembly structure to rotate; The disassembly structure can seal the bottom of the valve seat and can be connected to the valve core to disassemble it; The pulling structure drives the push plate to slide inside the valve body; The push plate is used to push the valve core after being separated from the valve stem.

[0006] Preferably, the disassembly structure comprises a sealing ring rotatably arranged on the adjusting rod, a convex block is fixedly connected to the top of the adjusting rod, a groove is formed at the bottom of the valve core, and the convex block matches the groove; After the protrusion cooperates with the groove, the valve core can be driven to rotate synchronously when the adjusting rod rotates; An extension sleeve is fixedly connected to the sealing ring, and the extension sleeve is rotatably connected to the adjusting rod.

[0007] Preferably, the bottom of the valve body is fixedly connected to a chassis via bolts, the adjusting rod is slidably arranged on the chassis, and the bottom of the adjusting rod is also fixedly connected to a rotating disk; The adjusting rod is threadedly connected to the chassis at a position close to the disassembly structure, and the remaining portion of the adjusting rod is slidably connected to the chassis.

[0008] Preferably, the top wall of the bottom plate and the bottom wall of the valve seat are both provided with sealing grooves; The top and bottom of the sealing ring are both provided with sealing rings, and the sealing rings are matched with the sealing grooves.

[0009] Preferably, both sides of the bottom of the valve seat are fixedly connected with guide rods, and the sealing ring slides between the two guide rods; The sealing ring is slidably connected to the guide rod via an ear plate.

[0010] Preferably, the pulling structure comprises a sealing frame slidably connected to the side wall of the valve body, a pull handle is fixedly connected to the side wall of the sealing frame, a sealing plug is fixedly connected to one end of the sealing frame, two slide bars are fixedly connected to the sealing plug, and the push plate is fixedly connected between the two slide bars; Two guide rods are fixedly connected to the valve seat, and the slide bar is slidably connected to the guide rods through a slide groove; One side of the bottom of the push plate is also fixedly connected with a chamfered strip that fits the bottom of the valve core.

[0011] Preferably, the side wall of the valve body is fixedly connected with a frame, and the sealing frame is in close contact with the frame; The sealing plug is inserted into the interior of the frame; The sealing plug and the frame are respectively provided with a first plug hole and a second plug hole, and the first plug hole and the second plug hole are both provided with plug rods.

[0012] Preferably, the valve body is also provided with a pressure sensor for detecting the flow at one end of the valve body, and the pressure sensor is also fixedly connected with a pressure gauge; One end of the pressure sensor is located in the valve body, at one side of the valve seat.

[0013] A method for using a pressure regulating valve precision control device comprises the following steps Step 1: Adjust the docking, rotate the turntable to drive the adjusting rod to rotate until the thread ends, then push the adjusting rod upward to drive the disassembly structure to move upward inside the valve body, then dock with the valve core, and at the same time make the disassembly structure seal the bottom of the valve seat; Step 2: Rotational disassembly. After the disassembly structure is docked with the valve core, the driving unit on the mounting seat controls the valve core to move upward, so that the valve core and the guide rod are separated. Then, the adjusting rod is rotated. Through the docking of the disassembly structure and the valve core, the adjusting rod synchronously drives the valve core to rotate, so that the adjusting rod is separated from the valve stem thread and falls between the two guide rods, and then the adjusting rod is moved downward. Step 3: After the valve core falls between the two guide rods, the insertion rod is pulled out to release the limit of the sealing frame, and then the sealing frame is pulled out by holding the pull handle. The sealing frame pulls the push plate through the slide bar, so that the valve core is brought out through the frame through the friction between the push plate and the valve core; Step 4: Replace the valve core again, place the new valve core on the two guide rods, then push the valve core inwards through the push plate, slide the valve core horizontally along the guide rods, push it to the installation position, and then move the adjustment rod upward again, the adjustment rod drives the disassembled structure and the new valve core to dock, and then rotate the adjustment rod to make the valve core and the valve stem threadedly connected; Step 5: Return the seal to its original position, continue to push the push plate until the sealing frame and the frame are in contact, insert the sealing plug into the frame, and when the first plug hole and the second plug hole are aligned, insert the plug rod therein to seal and fix.

[0014] In summary, the technical effects and advantages of the present invention are as follows: The present invention has a reasonable structure. Through the provided disassembly structure, push plate and pull-out structure, the valve seat can be well sealed during use to avoid leakage. In the process of sealing the valve seat, the valve core can also be disassembled. The present invention has stronger functionality and is simpler and more convenient to use. Moreover, with the cooperation of the push plate and the pull-out structure, the valve core can be smoothly pulled out of the interior of the valve body, and disassembly and removal is simpler and more convenient. The structure is simple and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partially cutaway three-dimensional structural schematic diagram of the present invention; Figure 3 It is a partially enlarged three-dimensional structural schematic diagram of the disassembly structure of the present invention; Figure 4 It is a partially cutaway schematic diagram of a large three-dimensional structure of a valve body in the present invention; Figure 5 It is a partially enlarged three-dimensional structural schematic diagram of the pull-out structure in the present invention; Figure 6 The figure is a flow chart of the method for using the present invention.

[0017] In the figure: 1. valve body; 2. valve seat; 3. mounting seat; 4. driving part; 5. valve stem; 6. valve core; 7. pressure sensor; 8. pressure gauge; 9. chassis; 10. sealing groove; 11. adjusting rod; 12. turntable; 13. sealing ring; 14. sealing ring; 15. extension sleeve; 16. bump; 17. groove; 18. guide rod; 19. ear plate; 20. guide rod; 21. slide groove; 22. sealing frame; 23. sealing plug; 24. slide bar; 25. push plate; 26. first plug hole; 27. frame; 28. second plug hole; 29. ​​plug rod; 30. handle. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0021] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms are not directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0023] Example: Reference Figure 1-6A pressure regulating valve precision control device shown in the figure comprises a valve body 1 and a valve seat 2 fixedly connected to the valve body 1, a valve stem 5 is further arranged inside the valve body 1, the valve stem 5 is controlled by a driving part 4, and a valve core 6 is threadedly connected to one end of the valve stem 5, a lifting and lowering regulating rod 11 is arranged at the bottom of the valve body 1, a disassembly structure matched with the valve core 6 is arranged on the regulating rod 11, a push plate 25 matched with the valve core 6 is further arranged inside the valve body 1, and a pulling structure for driving the push plate 25 to slide is further arranged inside the valve body 1; The driving part 4 is mounted on the valve body 1 through the mounting seat 3; The adjusting rod 11 can drive the disassembly structure to rotate; The disassembly structure can seal the bottom of the valve seat 2 and can be connected to the valve core 6 to disassemble it; The pull-out structure drives the push plate 25 to slide inside the valve body 1; The push plate 25 is used to push the valve core 6 after being separated from the valve stem 5 .

[0024] The driving unit 4 controls the lifting and lowering of the valve stem 5, thereby driving the valve core 6 to approach and move away from the valve seat 2, thereby controlling the opening to adjust the medium delivery pressure; when disassembling, the valve core 6 is lifted by the driving unit 4, and then the adjusting rod 11 drives the disassembly structure and the valve core 6 to dock, and the bottom of the valve seat 2 is sealed, and then the disassembly structure is driven to rotate to disassemble the valve core 6, and then the pulling structure is used to drive the push plate 25 to pull the separated valve core 6 out of the valve body 1.

[0025] By setting up the disassembly structure, the valve seat 2 can be well sealed during use to avoid leakage, and the valve core 6 can also be disassembled during the sealing of the valve seat 2, which has stronger functionality and is easier and more convenient to use. With the cooperation of the push plate 25 and the pull-out structure, the valve core 6 can be smoothly pulled out of the interior of the valve body 1, which makes disassembly and removal easier and more convenient, and has a simple structure and low production cost.

[0026] like Figure 3 As shown, the disassembly structure includes a sealing ring 13 rotatably arranged on the adjusting rod 11, a protrusion 16 is fixedly connected to the top of the adjusting rod 11, a groove 17 is provided at the bottom of the valve core 6, and the protrusion 16 matches with the groove 17; After the protrusion 16 and the groove 17 cooperate, the valve core 6 can be driven to rotate synchronously when the adjusting rod 11 rotates; An extension sleeve 15 is fixedly connected to the sealing ring 13 , and the extension sleeve 15 is rotatably connected to the adjusting rod 11 .

[0027] In summary, the adjusting rod 11 moves upward, and then synchronously drives the sealing ring 13 and the extension sleeve 15 to move, so that the protrusion 16 and the groove 17 on the valve core 6 are plugged in. Then, rotating the adjusting rod 11 can drive the valve core 6 to rotate synchronously, so as to unscrew the valve core 6.

[0028] Through the design of the extended sleeve 15, when the adjusting rod 11 moves upward to drive the protrusion 16 and the groove 17 to dock, the protrusion 16 can pass through the valve seat 2, and the sealing ring 13 continues to be located below the valve seat 2 to avoid obstruction, providing docking space for the protrusion 16 and the groove 17, and through the plug-in fit of the protrusion 16 and the groove 17, there is no need to carry or use additional tools to disassemble them, and the overall disassembly is simpler and more convenient.

[0029] like Figure 3 As shown, the bottom of the valve body 1 is fixedly connected to a chassis 9 by bolts, an adjusting rod 11 is slidably arranged on the chassis 9, and a rotating disk 12 is also fixedly connected to the bottom of the adjusting rod 11; The adjusting rod 11 is threadedly connected to the chassis 9 at a position close to the disassembly structure, and the remaining portion of the adjusting rod 11 is slidably connected to the chassis 9 .

[0030] The chassis 9 is mounted on the valve body 1 by bolts. The adjusting rod 11 can be driven to rotate by rotating the turntable 12, and then the adjusting rod 11 is pushed into the inside of the valve body 1 in cooperation with the thread of the chassis 9. When the thread is not in contact, the adjusting rod 11 can be pushed upward.

[0031] By designing that a part of the adjusting rod 11 is threadedly connected to the chassis 9, the adjusting rod 11 cannot be displaced due to the upward force when not in use, and the overall structure is more stable. After the threaded connection is lost, it can slide quickly, thereby improving the use efficiency. At the same time, the design of the turntable 12 enables the user to turn the adjusting rod 11 more conveniently and labor-savingly.

[0032] like Figure 3 As shown, the top wall of the bottom plate 9 and the bottom wall of the valve seat 2 are both provided with a sealing groove 10; The top and bottom of the sealing ring 13 are both provided with sealing rings 14 , and the sealing rings 14 match with the sealing groove 10 .

[0033] In summary, when the sealing ring 13 and the base plate 9 are in contact with each other, the sealing ring 14 will be embedded in the sealing groove 10 on the base plate 9 for sealing; when the sealing ring 13 and the bottom wall of the valve seat 2 are in contact with each other, the sealing ring 14 will be in contact with the sealing groove 10 on the bottom wall of the valve seat 2.

[0034] By arranging sealing rings 14 on the top wall and the bottom wall of the sealing ring 13, the connection between the chassis 9 and the adjusting rod 11 can be well sealed when not in use and when conveying the medium. When the valve core 6 is replaced, the valve seat 2 can be well sealed, the sealing effect is better, and the use is more stable.

[0035] like Figure 3 As shown, guide rods 18 are fixedly connected to both sides of the bottom of the valve seat 2, and the sealing ring 13 slides between the two guide rods 18; The sealing ring 13 is slidably connected to the guide rod 18 via the ear plate 19 .

[0036] In summary, during the upward displacement of the sealing ring 13 , it will slide upward along the guide rod 18 through the ear plate 19 .

[0037] Through the design of the guide rod 18 and the ear plate 19, when the adjusting rod 11 is threadedly advanced, the extension sleeve 15 is restricted from rotating by the ear plate 19 and the guide rod 18, thereby sliding steadily upward, avoiding the sealing ring 14 from rotating and rubbing violently with the sealing groove 10 when it is separated from the sealing groove 10, reducing wear and tear, and thus increasing the service life of the sealing ring 14.

[0038] like Figure 4-5 As shown, the pull-out structure includes a sealing frame 22 slidably connected to the side wall of the valve body 1, a pull handle 30 is fixedly connected to the side wall of the sealing frame 22, a sealing plug 23 is fixedly connected to one end of the sealing frame 22, two slide bars 24 are fixedly connected to the sealing plug 23, and a push plate 25 is fixedly connected between the two slide bars 24; Two guide rods 20 are fixedly connected to the valve seat 2, and the slide bar 24 is slidably connected to the guide rods 20 through the slide groove 21; A chamfered strip that fits the bottom of the valve core 6 is fixedly connected to one side of the bottom of the push plate 25 .

[0039] In summary, the upper part of the valve core 6 is larger than the distance between the two guide rods 20. The disassembled valve core 6 falls on the guide rod 20. Holding the pull handle 30 can pull the sealing frame 22, and then the sealing plug 23 and the two slide bars 24 are pulled out in turn. The two slide bars 24 will slide along the slide groove 21 on the guide rod 20, thereby driving the push plate 25 to simultaneously take out the valve core 6.

[0040] The pull handle 30 is provided to make it easier and more convenient to pull out the sealing frame 22, and the design of the guide rod 20 ensures that the valve core 6 and the valve stem 5 will fall directly between the two guide rods 20 after separation, without deviation or change of angle, and can slide out smoothly in cooperation with the slide bar 24 pulling the push plate 25, thereby preventing the valve core 6 from falling into the valve body 1. The disassembly and replacement are more accurate and have lower requirements, and can automatically slide to the middle of the two guide rods 20 through the structure of the valve core 6 and the guide rod 20 without precise alignment.

[0041] like Figure 4 As shown, the side wall of the valve body 1 is fixedly connected with a frame 27, and the sealing frame 22 fits with the frame 27; The sealing plug 23 is inserted into the interior of the frame 27; The sealing plug 23 and the frame 27 are respectively provided with a first plug hole 26 and a second plug hole 28 , and an insert rod 29 is inserted into each of the first plug hole 26 and the second plug hole 28 .

[0042] When disassembling, pull the rod 29 upward, the rod 29 is separated from the first hole 26 and the second hole 28, and then contacts the restriction on the sealing frame 22, so that the sealing frame 22 can be pulled out; when installing, the sealing plug 23 is inserted into the frame 27, and after the first hole 26 and the second hole 28 are aligned, the rod 29 is inserted therein to limit the sealing frame 22.

[0043] Through the design of the frame 27, the frame 27 has a small structure, which greatly retains the original structure of the valve body 1 while reducing the materials required for production and reducing production costs. In addition, by opening the first plug hole 26 on the sealing plug 23, the sealing effect is guaranteed while not affecting the efficiency of disassembly, and the overall use is simpler and more convenient.

[0044] like Figure 1 As shown, the valve body 1 is also provided with a pressure sensor 7 for detecting the flow at one end of the valve body 1, and a pressure gauge 8 is fixedly connected to the pressure sensor 7. The pressure sensor 7 is a prior art and will not be described in detail. One end of the pressure sensor 7 is located in the valve body 1 , at one side of the valve seat 2 .

[0045] In summary, the pressure sensor 7 can monitor the pressure of the flow inside the valve body 1 and then display it through the pressure gauge 8, so as to control the flow by controlling the valve core 6 to approach or move away from the valve seat 2 through the driving unit 4.

[0046] The design of the pressure gauge 8 enables the user to know the specific internal pressure value at the first time when observing, so that the user can quickly respond to make adjustments and other operations without the need for additional measurement time, and the use is simpler and more convenient.

[0047] A method for using a pressure regulating valve precision control device comprises the following steps Step 1: Adjust the docking, turn the turntable 12 to drive the adjusting rod 11 to rotate until the thread ends, then push the adjusting rod 11 upward to drive the disassembly structure to move upward inside the valve body 1, and then dock with the valve core 6, while making the disassembly structure seal the bottom of the valve seat 2; Step 2: Rotate and disassemble. After the disassembly structure and the valve core 6 are connected, the valve core 6 is controlled to move upward by the driving part 4 on the mounting seat 3, so that the valve core 6 and the guide rod 20 are separated, and then the adjusting rod 11 is rotated. Through the connection between the disassembly structure and the valve core 6, the adjusting rod 11 synchronously drives the valve core 6 to rotate, thereby separating from the valve stem 5 and falling between the two guide rods 20, and then the adjusting rod 11 is moved downward; Step 3: After the valve core 6 falls between the two guide rods 20, the insertion rod 29 is pulled out to release the limit of the sealing frame 22, and then the pull handle 30 is held to pull out the sealing frame 22. The sealing frame 22 pulls the push plate 25 through the slide bar 24, so that the valve core 6 is brought out through the frame 27 through the friction between the push plate 25 and the valve core 6; Step 4: Replace it again, place the new valve core 6 on the two guide rods 20, then push the valve core 6 inwards through the push plate 25, slide the valve core 6 horizontally along the guide rods 20, push it to the installation position, and then move the adjusting rod 11 upward again, the adjusting rod 11 drives the disassembled structure to connect with the new valve core 6, and then rotate the adjusting rod 11, so that the valve core 6 is threadedly connected with the valve stem 5; Step 5: Return the seal to its original position. Continue to push the push plate 25 until the sealing frame 22 and the frame 27 are in contact. The sealing plug 23 is inserted into the frame 27. When the first insertion hole 26 and the second insertion hole 28 are aligned, the insertion rod 29 is inserted therein to seal and fix.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure regulating valve precision control device, characterized in that: The invention comprises a valve body (1) and a valve seat (2) fixedly connected to the valve body (1); a valve stem (5) is further arranged inside the valve body (1); the valve stem (5) is controlled by a driving unit (4) and one end of the valve stem is threadedly connected to a valve core (6); a lifting and lowering regulating rod (11) is arranged at the bottom of the valve body (1); a disassembly structure matching the valve core (6) is arranged on the regulating rod (11); a push plate (25) matching the valve core (6) is further arranged inside the valve body (1); and a pulling and sliding structure for driving the push plate (25) to slide is further arranged inside the valve body (1); The driving part (4) is mounted on the valve body (1) via a mounting seat (3); The adjusting rod (11) can drive the disassembly structure to rotate; The disassembly structure can seal the bottom of the valve seat (2) and can be connected to the valve core (6) to disassemble it; The pulling structure drives the push plate (25) to slide inside the valve body (1); The push plate (25) is used to push the valve core (6) after it is separated from the valve stem (5).

2. A pressure regulating valve precision control device according to claim 1, characterized in that: The disassembly structure comprises a sealing ring (13) rotatably arranged on the adjusting rod (11), a convex block (16) is fixedly connected to the top of the adjusting rod (11), a groove (17) is formed at the bottom of the valve core (6), and the convex block (16) cooperates with the groove (17); When the protrusion (16) cooperates with the groove (17), the regulating rod (11) can drive the valve core (6) to rotate synchronously when the regulating rod (11) rotates; An extension sleeve (15) is fixedly connected to the sealing ring (13), and the extension sleeve (15) is rotatably connected to the adjustment rod (11).

3. A pressure regulating valve precision control device according to claim 2, characterized in that: The bottom of the valve body (1) is fixedly connected to a chassis (9) via bolts, the adjusting rod (11) is slidably arranged on the chassis (9), and the bottom of the adjusting rod (11) is also fixedly connected to a rotating disk (12); The adjusting rod (11) is threadedly connected to the chassis (9) at a position close to the disassembly structure, and the remaining portion of the adjusting rod (11) is slidably connected to the chassis (9).

4. A pressure regulating valve precision control device according to claim 3, characterized in that: The top wall of the bottom plate (9) and the bottom wall of the valve seat (2) are both provided with sealing grooves (10); The top and bottom of the sealing ring (13) are both provided with sealing rings (14), and the sealing rings (14) are matched with the sealing groove (10).

5. A pressure regulating valve precision control device according to claim 4, characterized in that: Both sides of the bottom of the valve seat (2) are fixedly connected to guide rods (18), and the sealing ring (13) slides between the two guide rods (18); The sealing ring (13) is slidably connected to the guide rod (18) via a lug plate (19).

6. The pressure regulating valve precision control device according to claim 1, characterized in that: The pulling structure comprises a sealing frame (22) slidably connected to the side wall of the valve body (1), a pull handle (30) is fixedly connected to the side wall of the sealing frame (22), a sealing plug (23) is fixedly connected to one end of the sealing frame (22), two sliding strips (24) are fixedly connected to the sealing plug (23), and the push plate (25) is fixedly connected between the two sliding strips (24); Two guide rods (20) are fixedly connected to the valve seat (2), and the slide bar (24) is slidably connected to the guide rods (20) via a slide groove (21); One side of the bottom of the push plate (25) is also fixedly connected to a chamfered strip that fits the bottom of the valve core (6).

7. A pressure regulating valve precision control device according to claim 6, characterized in that: The side wall of the valve body (1) is fixedly connected with a frame (27), and the sealing frame (22) is in close contact with the frame (27); The sealing plug (23) is inserted into the interior of the frame (27); The sealing plug (23) and the frame (27) are respectively provided with a first plug hole (26) and a second plug hole (28), and an insertion rod (29) is inserted into each of the first plug hole (26) and the second plug hole (28).

8. The pressure regulating valve precision control device according to claim 1, characterized in that: The valve body (1) is also provided with a pressure sensor (7) for detecting the flow rate at one end of the valve body (1), and the pressure sensor (7) is also fixedly connected to a pressure gauge (8); One end of the pressure sensor (7) is located in the valve body (1), on one side of the valve seat (2).

9. A method for using a pressure regulating valve precision control device, characterized in that: The operation using the control device according to any one of claims 1 to 8 comprises the following steps: Step 1: Adjust the docking, rotate the rotary disk (12) to drive the adjusting rod (11) to rotate until the thread ends, then push the adjusting rod (11) upward to drive the disassembly structure to move upward inside the valve body (1), then dock with the valve core (6), and at the same time make the disassembly structure seal the bottom of the valve seat (2); Step 2: Rotational disassembly. After the disassembly structure and the valve core (6) are docked, the driving unit (4) on the mounting seat (3) controls the valve core (6) to move upward, so that the valve core (6) and the guide rod (20) are separated. Then, the adjusting rod (11) is rotated. Through the docking of the disassembly structure and the valve core (6), the adjusting rod (11) synchronously drives the valve core (6) to rotate, thereby separating from the valve stem (5) through the thread and falling between the two guide rods (20), and then the adjusting rod (11) is moved downward. Step 3: Disassemble and remove. After the valve core (6) falls between the two guide rods (20), pull out the insertion rod (29) to release the limit on the sealing frame (22), then hold the pull handle (30) to pull out the sealing frame (22). The sealing frame (22) pulls the push plate (25) through the slide bar (24), so that the valve core (6) is brought out through the frame (27) through the friction between the push plate (25) and the valve core (6); Step 4: Replace the valve core (6) again, place the new valve core (6) on the two guide rods (20), then push the valve core (6) inwards through the push plate (25), slide the valve core (6) horizontally along the guide rods (20), push it to the installation position, and then move the adjustment rod (11) upward again, so that the adjustment rod (11) drives the disassembled structure to dock with the new valve core (6), and then rotate the adjustment rod (11) so that the valve core (6) is threadedly connected to the valve stem (5); Step 5: Return the seal to its original position, continue to push the push plate (25) until the sealing frame (22) and the frame (27) come into contact, insert the sealing plug (23) into the frame (27), and when the first insertion hole (26) and the second insertion hole (28) are aligned, insert the insertion rod (29) therein to seal and fix.

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