An anti-clogging hydraulic valve device

Abstract

This invention belongs to the field of hydraulic valve technology, specifically an anti-clogging hydraulic valve device, including a valve body, an adjusting screw, a valve core, and a throttling block. A flow channel is provided through the middle of the valve body. A drainage cavity is provided on the inner wall of the flow channel below the bottom of the throttling block. An oil inlet and an oil outlet are respectively provided on the inner wall of the flow channel on both sides of the throttling block, both communicating with the drainage cavity. This invention controls the adjusting screw to move the oil inlet and outlet sealing blocks on both sides downwards, opening both the oil inlet and outlet drainage ports. At this time, the obstructed hydraulic oil can enter the oil inlet drainage port along the side wall of the throttling block, providing the hydraulic oil with a second passage besides the throttling port. By adjusting the hydraulic oil flow direction, areas on the side wall of the throttling block that may accumulate oil and impurities are concentratedly flushed, reducing the accumulation of oil and impurities inside the flow channel and ensuring the smooth flow of the hydraulic oil device.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic valve technology, specifically an anti-clogging hydraulic valve device. Background Technology

[0002] The core objective of a hydraulic system is to "transmit energy through hydraulic oil to drive actuators to complete specified actions" (such as spindle speed control in machine tools or bucket lifting and lowering in excavators). The "control logic" of this process is entirely realized by hydraulic valves. An analogy can be made: if the hydraulic system is the "human body," the hydraulic pump is the "heart" (providing power), the hydraulic oil is the "blood" (transmitting energy), and the actuators are the "limbs" (completing actions), then the hydraulic valves are the "brain and nerves," responsible for directing the pressure, flow, and direction of the "blood," ensuring that the "limbs" act according to instructions.

[0003] Hydraulic valves are the core control units of hydraulic systems, and the two are interdependent as "functional components" and "overall systems". Hydraulic systems need to achieve precise control of pressure, flow and direction through hydraulic valves in order to convert hydraulic energy into mechanical motion of actuators (such as hydraulic cylinders and hydraulic motors). Conversely, hydraulic valves cannot perform any function independently without the hydraulic system, and their design and selection must match the working requirements of the system (such as pressure rating, flow range and control accuracy).

[0004] One of the important functions of a hydraulic valve is to regulate the flow of hydraulic oil in a hydraulic system, thereby achieving precise control over the speed of mechanical movement of the actuator. This is generally achieved by adjusting the position of the valve core to change the flow area of ​​the hydraulic oil inside the valve. However, this process can also lead to an increase in the flow resistance of the hydraulic oil. Oil impurities in the hydraulic oil precipitate out and accumulate inside the hydraulic valve during continuous operation, resulting in obstructed flow, increased pressure, and even blockage of the hydraulic valve. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes an anti-clogging hydraulic valve device.

[0006] The technical solution adopted by the present invention to solve its technical problem is as follows: The present invention proposes an anti-clogging hydraulic valve device, including a valve body, an adjusting screw, a valve core and a throttling block. A flow channel is provided through the middle part of the valve body, and an adjusting hole is provided at the top of the middle part of the flow channel. The adjusting screw is located inside the adjusting hole and is threadedly engaged with the inner wall of the adjusting hole.

[0007] The conical valve core is installed at the bottom of the adjusting screw, the throttling block is installed on the inner wall of the flow channel at the lower side of the adjusting hole, and a throttling orifice is formed between the top of the throttling block and the inner wall of the bottom opening of the adjusting hole, with the valve core located on the upper side of the throttling orifice;

[0008] A drainage cavity is provided on the inner wall of the flow channel at the lower side of the throttling block. An oil inlet and an oil outlet are respectively provided on the inner wall of the flow channel on both sides of the throttling block, both of which communicate with the drainage cavity. An oil inlet sealing block is slidably installed on the oil inlet sealing block, and the oil inlet sealing block is located on the side of the throttling block closest to the oil inlet of the flow channel. The oil outlet sealing block is located below the throttling block, and an oil outlet sealing block is slidably installed inside it. The bottom of the oil inlet sealing block and the oil outlet sealing block are connected to an adjusting rod to adjust the position of the oil inlet sealing block and the oil outlet sealing block.

[0009] Preferably, a piston plate is slidably arranged inside the unblocking cavity, the adjusting rod is connected to the lower surface of the piston plate, and the bottom of the oil inlet sealing block and the oil outlet sealing block are both connected to the upper surface of the piston plate.

[0010] Preferably, the tops of the oil inlet sealing block and the oil outlet sealing block extend upward and cover the outer surface of the throttling block sidewall.

[0011] Preferably, guide holes are evenly provided on the side wall of the oil inlet sealing block. The guide holes extend laterally and are tapered holes. The opening of the guide hole near the throttling block is the larger end.

[0012] Preferably, the outer surface of the oil inlet sealing block near the flow channel is covered with a protective film, the edge of the protective film is fixed to the outer surface of the oil inlet sealing block, and cleaning holes are uniformly arranged on the outer surface of the protective film, with the cleaning holes being staggered from the guide holes.

[0013] Preferably, a guide groove is provided at the bottom of the throttling block, the guide groove extends upward, and flushing holes are evenly provided on the inner wall of the guide groove near the oil inlet sealing block, the position of the flushing holes is staggered from the guide holes.

[0014] Preferably, the oil inlet sealing block is divided into an oil inlet section and a sealing section from top to bottom along the vertical direction. The oil inlet section is conical and has a sloping sidewall structure, while the sealing section is square and has a vertical sidewall structure.

[0015] Preferably, the oil outlet sealing block is uniformly provided with impact grooves on the side near the throttling block, the impact grooves extend vertically upward, and the top opening of the impact grooves points to the lower side of the throttling port.

[0016] The beneficial effects of this invention are as follows:

[0017] The anti-clogging hydraulic valve device of this invention moves the inlet and outlet sealing blocks on both sides downward by controlling the adjusting rod, so that both the inlet and outlet openings are opened. At this time, the hydraulic oil that is blocked can enter the inlet opening along the side wall of the throttling block, adjusting the flow direction of the hydraulic oil and flushing the oil and impurities accumulated in the side wall area of ​​the throttling block. After the hydraulic oil enters the unblocking cavity, it flows out from the outlet opening, so that the hydraulic oil obtains a second passage in addition to the throttling port. By adjusting the flow direction of the hydraulic oil, the area on the side wall of the throttling block where oil and impurities may accumulate is concentratedly flushed, reducing the accumulation of oil and impurities in the flow channel and ensuring the passability of the hydraulic oil device. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the present invention;

[0020] Figure 2 This is a partial cross-sectional view of the present invention;

[0021] Figure 3 This is a schematic diagram of the oil inlet sealing block and the oil outlet sealing block after they have been moved down in this invention;

[0022] Figure 4 yes Figure 2 A magnified view of a portion of point A in the middle.

[0023] In the diagram: Valve body 1, flow channel 11, adjusting hole 12, throttling port 13, adjusting screw 2, valve core 3, throttling block 4, guide groove 41, flushing hole 411, unclogging cavity 5, oil inlet unclogging port 51, oil inlet sealing block 511, guide hole 512, protective membrane 513, cleaning hole 514, oil outlet unclogging port 52, oil outlet sealing block 521, impact groove 522, piston plate 53, adjusting rod 54. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1:

[0026] As shown in the attached diagram of the instruction manual. Figures 1-4As shown, this application proposes an anti-clogging hydraulic valve device, including a valve body 1, an adjusting screw 2, a valve core 3 and a throttling block 4. The valve body 1 is provided with an oil inlet and an oil outlet on both sides respectively. A flow channel 11 is provided through the part between the oil inlet and the oil outlet. An adjusting hole 12 is provided at the top of the middle part of the flow channel 11. The bottom of the adjusting screw 2 extends into the top opening of the adjusting hole 12, and the adjusting screw 2 is threadedly engaged with the inner wall of the adjusting hole 12.

[0027] The conical valve core 3 is installed at the bottom of the adjusting screw 2, and the throttle block 4 is installed on the inner wall of the flow channel 11 at the position below the adjusting hole 12. The top of the throttle block 4 and the inner wall of the bottom opening of the adjusting hole 12 form a throttle orifice 13. The valve core 3 is located on the upper side of the throttle orifice 13. The size of the throttle orifice 13 is adjusted by changing the downward movement distance of the valve core 3, thereby adjusting the flow rate of the hydraulic oil.

[0028] A drainage cavity 5 is provided on the inner wall of the flow channel 11 at the lower side of the bottom of the throttling block 4. An oil inlet drainage port 51 and an oil outlet drainage port 52 are respectively provided on both sides of the inner wall of the flow channel 11 at the throttling block 4, both communicating with the drainage cavity 5. An oil inlet sealing block 511 is slidably installed on the oil inlet drainage port 51, and the oil inlet drainage port 51 is located on the side of the throttling block 4 closest to the oil inlet of the flow channel 11. The oil outlet drainage port 52 is located below the throttling port 13, and an oil outlet sealing block 521 is slidably installed inside it, allowing oil to enter. The bottom of the sealing block 511 and the oil outlet sealing block 521 are connected to the adjusting rod 54 to adjust the position of the oil inlet sealing block 511 and the oil outlet sealing block 521. The adjusting rod 54 can be threadedly connected to the bottom of the unblocking cavity 5, and the feeding movement can be achieved by manually rotating the adjusting rod 54. Alternatively, the adjusting rod 54 can be slidably connected to the bottom of the unblocking cavity 5, and the adjusting rod 54 can be connected to the electric telescopic device on the outside. The movement of the adjusting rod 54 can be achieved by controlling the movement of the output end of the telescopic device through the controller.

[0029] Specific workflow: As an important part of the hydraulic system, the hydraulic valve device provided in this application mainly undertakes the function of adjusting the flow rate of hydraulic oil in the hydraulic system, thereby realizing precise control of the action of the actuators in the hydraulic system; specifically, during the operation of the hydraulic system, hydraulic oil flows in from the inlet of the flow channel 11 and flows out from the outlet on the other side. During this process, the hydraulic oil needs to pass through the throttle port 13 in the middle part; the operator can manually or automatically control the operation by rotating the adjusting screw 2 to drive the bottom conical valve core 3 to move vertically, and adjust the distance between the valve core 3 and the throttle port 13 to control the size of the area through which the throttle port 13 passes.

[0030] When the hydraulic oil flows near the throttle port 13, it first contacts the throttle block 4. Because the vertical cross-section of the throttle block 4 is a right trapezoid and the side near the oil inlet is inclined, the hydraulic oil flows upward along the inclined part of the throttle block 4 to the position near the throttle port 13, and passes through the gap between the valve core 3 and the throttle port 13. Operating the adjusting screw 2 causes the valve core 3 to move upward, at which time the gap between the valve core 3 and the throttle port 13 increases, the hydraulic oil flow increases, and the action of the hydraulic system actuator speeds up. Conversely, operating the adjusting screw 2 causes the valve core 3 to move downward, which reduces the gap between the valve core 3 and the throttle port 13, reduces the hydraulic oil flow, and slows down the action of the hydraulic system actuator. In this way, by precisely adjusting the adjusting screw 2, precise control of the hydraulic oil flow and the action of the actuator can be achieved.

[0031] However, during long-term operation, because the hydraulic oil is blocked when passing through the throttle port 13, solid impurities such as oil stains in the hydraulic oil are released and may remain in the flow channel 11 near the throttle port 13 due to the obstruction of the hydraulic oil flow. This leads to an increase in the flow resistance of the hydraulic oil, a decrease in the accuracy of the control of the hydraulic system actuators, and even blockage inside the hydraulic valve device due to the continuous accumulation of oil stains and impurities, affecting the normal operation of the hydraulic system.

[0032] Therefore, this application provides an oil inlet 51 and an oil outlet 52 on the inner wall of the flow channel 11 on both sides of the throttling block 4. This is because the hydraulic oil is obstructed when passing through the throttling block 4, and because the oil and impurities in the hydraulic oil mainly accumulate in the gap area between the surface of the throttling block 4 near the oil inlet and the inner wall of the flow channel 11, which continuously increases the flow resistance of the hydraulic oil. This allows for the periodic unblocking of the hydraulic valve device, cleaning up any accumulated impurities, achieving maintenance of the valve body 1, and increasing the normal operating cycle time.

[0033] Specifically, the adjusting screw 2 can be controlled to move downwards, causing the valve core 3 to move downwards and contact the throttle port 13, so that the gap area between the throttle port 13 and the valve core 3 reaches the minimum passing area. At this time, the resistance to the flowing hydraulic oil increases. Then, the adjusting rod 54 is controlled to move the oil inlet sealing block 511 and oil outlet sealing block 521 on both sides downwards, so that the oil inlet unblocking port 51 and the oil outlet unblocking port 52 are both opened. At this time, the hydraulic oil that is blocked can enter the oil inlet unblocking port 51 along the side wall of the throttle block 4, adjust the hydraulic oil flow direction, flush away the oil and impurities accumulated in the side wall area of ​​the throttle block 4, and the hydraulic oil enters the unblocking chamber 5. After entering the interior, the hydraulic oil flows out from the oil outlet 52, giving the hydraulic oil a second passage in addition to the throttle port 13. By adjusting the flow direction of the hydraulic oil, the area on the side wall of the throttle block 4 that may accumulate oil and impurities is concentratedly flushed, reducing the accumulation of oil and impurities inside the flow channel 11 and ensuring the passability of the hydraulic oil device. Furthermore, because the oil outlet 52 is located below the throttle port 13, the hydraulic oil flowing out from the second passage flows out from the oil outlet 52 and then flushes the throttle port 13 in the opposite direction, carrying away the oil and impurities that may accumulate in the gap of the throttle port 13, further ensuring the passability of the internal flow channel of the valve body 1.

[0034] Furthermore, when the accumulation of oil and impurities leads to a severe reduction in flow rate or even blockage of the internal flow channel 11 of the valve body 1, preventing the hydraulic oil from flowing normally and causing an abnormal increase in pressure in the hydraulic pipeline, the obstructed hydraulic oil can be drained from the inlet 51 and outlet 52 by opening the second passage. This prevents the hydraulic oil from being blocked and causing excessive pressure to impact the internal components of the valve body 1, thus avoiding damage to the hydraulic valve device due to excessive pressure. This ensures the safe operation and normal flow of the hydraulic valve device.

[0035] Example 2:

[0036] Based on Embodiment 1, a piston plate 53 is slidably arranged inside the unblocking cavity 5. An adjusting rod 54 is connected to the lower surface of the piston plate 53. The bottoms of the oil inlet sealing block 511 and the oil outlet sealing block 521 are both connected to the upper surface of the piston plate 53. The tops of the oil inlet sealing block 511 and the oil outlet sealing block 521 extend upward and cover the outer surface of the side wall of the throttling block 4.

[0037] Specific workflow: Based on the specific workflow in Example 1, when the oil inlet 51 and the oil outlet 52 are kept closed, the piston plate 53 is at the top of the unblocking cavity 5, and the edge of the piston plate 53 is made of elastic material, which keeps in close contact with the inner wall of the unblocking cavity 5. This can ensure the closure of the oil inlet 51 and the oil outlet 52. Even if hydraulic oil seeps downward from the gap between the oil inlet sealing block 511 and the oil inlet 51, it will be intercepted by the piston plate 53, thereby reducing the seepage loss of hydraulic oil when it flows through the flow channel 11 of the valve body 1 during normal operation of the hydraulic system.

[0038] When the inside of the flow channel 11 needs to be cleaned, the piston plate 53 is controlled to move down, which drives the oil inlet sealing block 511 and the oil outlet sealing block 521 to move down, so that the closed state of the oil inlet dredging port 51 and the oil outlet dredging port 52 comes into contact, realizing the second passage. The hydraulic oil can bypass the throttle block 4 and pass through the valve body 1. In this process, the oil dirt and impurities that are blocked and accumulated by the throttle block 4 can be flushed away. After the cleaning process is completed, the piston plate 53 is controlled to move up to the top of the dredging cavity 5, which can fully discharge the hydraulic oil that has entered the dredging cavity 5 and reduce the loss of hydraulic oil.

[0039] Furthermore, the top of the oil inlet sealing block 511 extends vertically along the side of the throttle block 4 near the oil inlet, effectively covering the surface of the throttle block 4 that obstructs the flow of hydraulic oil. As a result, oil and impurities that have stagnated and settled due to the obstructed flow accumulate in the area between the side wall of the oil inlet sealing block 511 and the inner wall of the flow channel 11. During cleaning, the oil inlet sealing block 511 is controlled to move downward, which disrupts the stability of the oil and impurity accumulation area. This allows some oil and impurities to be directly carried into the unblocking cavity 5 and carried away by the impact of the continuously flowing hydraulic oil, further reducing the oil and impurities retained inside the flow channel 11 and ensuring the normal operation of the hydraulic system.

[0040] Example 3:

[0041] Based on Embodiment 2, guide holes 512 are uniformly arranged on the side wall of the oil inlet sealing block 511. The guide holes 512 extend laterally and are tapered holes. The opening of the guide holes 512 near the throttling block 4 is the larger end.

[0042] Specific workflow: Based on the specific workflow in Example 1, after cleaning, as the piston plate 53 moves upward to squeeze and discharge the residual hydraulic oil inside the unblocking cavity 5, the residual hydraulic oil in the area between the inlet sealing block 511 and the outlet sealing block 521 on both sides is squeezed and flows outward. Since the inlet sealing block 511 is uniformly provided with guide holes 512, the hydraulic oil in the gap area is compressed and flows in from the large end of the guide hole 512 and flows out from the surface of the inlet sealing block 511 near the oil inlet. This causes the oil stains and impurities adhering to the side wall of the inlet sealing block 511 to be impacted from the inside out, causing the oil stains and impurities to fall off the side wall of the inlet sealing block 511. During the continuous upward movement of the piston plate 53, the fallen oil stains and impurities are mixed into the flowing hydraulic oil and finally flow out of the valve body 1, ensuring that the residual oil stains and impurities on the inlet sealing block 511 are fully cleaned and further ensuring the passability of the flow channel 11.

[0043] Example 4:

[0044] Based on Embodiment 3, the outer surface of the oil inlet sealing block 511 near the flow channel 11 is covered with an elastic protective film 513. The edge of the protective film 513 is fixed to the outer surface of the oil inlet sealing block 511, and cleaning holes 514 are uniformly arranged on the outer surface of the protective film 513. The cleaning holes 514 are staggered from the guide holes 512.

[0045] The bottom of the throttling block 4 is provided with a guide groove 41, which extends upward. The inner wall of the guide groove 41 is evenly provided with flushing holes 411 on the side near the oil inlet sealing block 511. The position of the flushing holes 411 is offset from that of the guide holes 512.

[0046] The oil inlet sealing block 511 is divided into an oil inlet section and a sealing section from top to bottom along the vertical direction. The oil inlet section is conical and has a sloping sidewall structure, while the sealing section is square and has a vertical sidewall structure.

[0047] Specific workflow: Based on the specific workflow in Example 3, as the piston plate 53 moves upward, when the oil inlet part of the oil inlet sealing block 511 passes through the oil inlet drain port 51, a large gap is maintained between the inclined part of the oil inlet part and the side wall of the oil inlet drain port 51, so that the pressurized hydraulic oil can flow out smoothly through the gap area. When the sealing part of the oil inlet sealing block 511 slides into the oil inlet drain port 51, the oil inlet drain port 51 is sealed. As the piston plate 53 continues to move upward, the residual hydraulic oil inside the drain cavity 5 is pressurized and flows into the guide groove 41 and flows out from the flushing hole 411.

[0048] During normal operation, the guide hole 512 on the oil inlet sealing block 511 is offset from the flushing hole 411 on the side wall of the throttling block 4. At this time, the guide hole 512 on the oil inlet sealing block 511 is in a closed state, and a protective film 513 is also covered on the outside of the inclined structure, so that the outer opening of the guide hole 512 is closed. The normally flowing hydraulic oil flows upward along the surface of the protective film 513 to the throttling port 13 after passing through the oil inlet sealing block 511. For oil stains and impurities in the hydraulic oil that settle due to obstruction, the interception of the protective film 513 causes them to adhere to the outer surface of the protective film 513.

[0049] When the hydraulic oil remaining inside the unblocking chamber 5 flows out of the flushing hole 411 due to pressure acceleration, as the oil inlet sealing block 511 and the throttling block 4 slide relative to each other, the guide hole 512 on the oil inlet sealing block 511 and the flushing hole 411 move relative to each other, resulting in intermittent connection. At the moment of connection, the injected hydraulic oil enters the gap between the protective membrane 513 and the oil inlet sealing block 511, causing the protective membrane 513 to expand and deform under pressure. Subsequently, the hydraulic oil flows out from the cleaning hole 514 on the protective membrane 513, flushing the oil and impurities adhering to the surface of the protective membrane 513. The expansion and deformation of the protective membrane 513 causes the joint between the protective membrane 513 and the oil and impurities to be stretched, effectively releasing the adhesion between the oil and impurities and the protective membrane 513, accelerating the removal of the oil and impurities from the surface of the protective membrane 513, and flowing out with the flowing hydraulic oil, further ensuring the passability of the valve body 1.

[0050] Example 5:

[0051] Based on Embodiment 4, the oil outlet sealing block 521 is uniformly provided with impact grooves 522 on the side near the throttling block 4. The impact grooves 522 extend vertically upward, and the top opening of the impact grooves 522 points to the lower side of the throttling port 13.

[0052] Specific workflow: Based on the specific workflow in Example 4, during the pressurization process, some of the residual hydraulic oil located in the gap area between the inlet sealing block 511 and the outlet sealing block 521 flows upward along the interconnected impact groove 522. Because the opening of the impact groove 522 points to the lower side of the throttle port 13, some of the hydraulic oil accelerates upward along the impact groove 522 under pressure, and scours the gap between the valve core 3 and the inner wall of the throttle port 13 on the lower side of the throttle port 13, and collides with the forward-flowing hydraulic oil. The impact disturbance generated by the collision accelerates the shedding of oil stains and impurities that may have accumulated and adhered on the inner wall of the throttle port 13, further ensuring the smooth flow of hydraulic oil and maintaining the normal operation of the hydraulic system.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-clogging hydraulic valve device comprising a valve body (1), an adjusting screw (2), a valve core (3) and a throttle block (4), characterized in that: A flow channel (11) is formed in the middle of the valve body (1), and an adjusting hole (12) is formed in the top of the middle of the flow channel (11); an adjusting screw (2) is arranged in the adjusting hole (12) and is in threaded engagement with the inner wall of the adjusting hole (12); A tapered valve core (3) is arranged at the bottom of the adjusting screw (2), and a throttling block (4) is arranged on the inner wall of the flow channel (11) at the position below the adjusting hole (12), and a throttling gap (13) is formed between the top of the throttling block (4) and the opening of the bottom of the adjusting hole (12), and the valve core (3) is arranged above the throttling gap (13); A dredging cavity (5) is arranged on the inner wall of the flow channel (11) at the position below the bottom of the throttling block (4), and an oil inlet dredging gap (51) and an oil outlet dredging gap (52) are arranged on the inner wall of the flow channel (11) at the positions on both sides of the throttling block (4) and are communicated with the dredging cavity (5); the oil inlet dredging gap (51) is slidably provided with an oil inlet closing block (511), and the oil inlet dredging gap (51) is arranged on the side of the throttling block (4) close to the oil inlet of the flow channel (11); the oil outlet dredging gap (52) is arranged below the throttling gap (13) and is slidably provided with an oil outlet closing block (521) inside, and the bottom of the oil inlet closing block (511) and the oil outlet closing block (521) is connected with an adjusting rod (54) for adjusting the positions of the oil inlet closing block (511) and the oil outlet closing block (521).

2. A choke valve apparatus according to claim 1, wherein: The dredging cavity (5) is slidably provided with a piston plate (53), the adjusting rod (54) is connected with the lower surface of the piston plate (53), and the bottom of the oil inlet closing block (511) and the oil outlet closing block (521) is connected with the upper surface of the piston plate (53).

3. A choke valve apparatus according to claim 2, wherein: The top of the oil inlet closing block (511) and the oil outlet closing block (521) extends upward and covers the outer surface of the side wall of the throttling block (4).

4. A choke valve apparatus according to claim 3, wherein: The side wall of the oil inlet closing block (511) is uniformly provided with a flow guide hole (512), the flow guide hole (512) extends transversely, the flow guide hole (512) is a tapered hole, and the opening of the flow guide hole (512) close to the throttling block (4) is a large end.

5. A choke valve apparatus according to claim 4, wherein: The outer surface of the oil inlet closing block (511) close to the flow channel (11) is covered with a protective film (513), the edge of the protective film (513) is fixedly connected with the outer surface of the oil inlet closing block (511), and the outer surface of the protective film (513) is uniformly provided with a cleaning hole (514), and the cleaning hole (514) is staggered with the flow guide hole (512).

6. A choke valve apparatus according to claim 5, wherein: The bottom of the throttling block (4) is provided with a flow guide groove (41), the flow guide groove (41) extends upward, and the inner wall of the flow guide groove (41) is uniformly provided with a flushing hole (411) close to the oil inlet closing block (511), and the position of the flushing hole (411) is staggered with the flow guide hole (512).

7. A choke valve apparatus according to claim 6, wherein: The oil inlet closing block (511) is divided into an oil inlet part and a closing part from top to bottom along the vertical direction, the oil inlet part is tapered, and the side wall is a slope structure, the closing part is square, and the side wall is a vertical surface structure.

8. A choke valve apparatus according to claim 7, wherein: The oil outlet closing block (521) is uniformly provided with an impact groove (522) close to the throttling block (4), the impact groove (522) extends vertically upward, and the top opening of the impact groove (522) points to the lower side of the throttling gap (13).

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