Slurry valve and control method thereof

Abstract

The invention discloses a slurry valve and a control method thereof. The slurry valve comprises a valve body, a valve plate and a pressure regulating device, the valve plate is further connected with an executing mechanism located outside the plate bin, the executing mechanism is driven to enable the valve plate to enter the joint of the feeding pipe section and the discharging pipe section from the plate bin, and feeding is blocked. The pressure regulating device comprises a first expansion air bag, a pressure regulating air bag and a flexible air pipe for communicating the first expansion air bag with the pressure regulating air bag; a first sealing plate is arranged on the side, close to the feeding pipe section, of the valve plate, and the first expansion air bag is arranged between the first sealing plate and the valve plate; the pressure adjusting air bag is arranged in the feeding pipe section; after the slurry valve is closed, slurry flows back and is pressurized in the feeding pipe section, gas in the pressure adjusting air bag is compressed and enters the first expansion air bag through the flexible air pipe, and the volume of the first expansion air bag is expanded so as to abut against the feeding pipe section through the first sealing plate. According to the technical scheme, the sealing performance of the slurry valve is improved under the high pressure difference condition.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a slurry valve and a control method thereof. Background Art

[0002] In industrial processes, the flow and control of various slurries such as mud, pulp, ceramic slurry and chemical slurry are extremely critical to production efficiency and product quality. These slurries generally have the characteristics of high viscosity and high solid content. Therefore, in many applications, slurry valves need to operate under high pressure difference conditions. However, this requires the slurry valve to be able to withstand a large pressure difference while maintaining stable sealing performance to prevent leakage and ensure precise control of the fluid. However, the current slurry valve design is often difficult to simultaneously meet the stability and sealing requirements under high pressure difference operating conditions. Specifically, valve plates, actuators and seals are prone to deformation and damage under high pressure difference conditions, which can easily cause slurry valve leakage and unstable performance. Summary of the invention

[0003] The object of the present invention is to provide a slurry valve and a control method thereof, aiming to solve the technical problems of easy leakage and unstable performance of valves in high pressure difference environments.

[0004] To achieve this object, the present invention adopts the following technical solutions: A slurry valve comprises a valve body, a valve plate and a pressure regulating device; The valve body comprises a coaxially arranged feed pipe section and a discharge pipe section, and a plate bin formed between the feed pipe section and the discharge pipe section, wherein the plate bin is used to store the valve plate; The valve plate is also connected to an actuator located outside the silo, and driving the actuator can enable the valve plate to enter the connection between the feed pipe section and the discharge pipe section from the silo to cut off the feed; The pressure regulating device comprises a first expansion airbag, a pressure regulating airbag and a flexible air tube connecting the first expansion airbag and the pressure regulating airbag; A first sealing plate is disposed on one side of the valve plate close to the feed pipe section, and the first expansion airbag is disposed between the first sealing plate and the valve plate; the pressure regulating airbag is disposed in the feed pipe section; After closing the slurry valve, the slurry refluxes and pressurizes in the feed pipe section, the gas in the pressure-regulating airbag is compressed and enters the first expansion airbag through the flexible air pipe, and the volume of the first expansion airbag expands to abut the feed pipe section through the first sealing plate.

[0005] In one embodiment, a sealing ring is embedded in the first sealing plate, the sealing ring abuts against the feed pipe section, and the sealing ring is flush with the height of the first sealing plate.

[0006] In one embodiment, a spring is further provided between the first sealing plate and the valve plate, and the spring is fixedly connected to the first sealing plate and the valve plate respectively.

[0007] In one embodiment, the feed pipe section is further formed with a receiving space for receiving the pressure regulating airbag; an outer shell is provided on a side of the pressure regulating airbag close to the feed channel; When the slurry valve is opened, the pressure regulating airbag is accommodated in the accommodation space, and the slurry contacts the outer shell; When the slurry valve is closed, the slurry flows back, and the pressure-regulating airbag is separated from the containing space due to the water hammer effect, so that the slurry is in direct contact with the pressure-regulating airbag.

[0008] In one embodiment, the feed pipe section is further provided with a limit member, and the limit member cooperates with the outer shell.

[0009] In one embodiment, a plurality of spoilers are further provided on a side of the outer shell close to the feed channel, and the spoilers are inclined toward the valve plate.

[0010] In one embodiment, the pressure regulating device further includes an air pump and an exhaust device, wherein the air pump and the exhaust device are disposed outside the valve body and are respectively connected to the flexible air pipe.

[0011] The present invention also proposes a control method for a slurry valve, which is applied to any one of the slurry valves described above, wherein the actuator includes a motor actuator, and the slurry valve also includes a PLC controller, a position sensor, and a pressure sensor, wherein the position sensor is used to monitor the position of the valve plate in real time, and the pressure sensor is used to monitor the pressure in the feed pipe section in real time; an electromagnetic valve is also provided between the first expansion airbag and the pressure regulating airbag; The method comprises: S1. Start the power supply, and the PLC controller performs self-test, which includes checking the power-on status of the motor actuator, sensor, solenoid valve, air pump and status monitoring system; after confirming that all equipment is working normally, the slurry valve enters the standby working state; S2, the PLC controller receives a flow demand signal, and determines the slurry flow and valve plate position requirements according to the flow demand signal; S3, the PLC controller issues an instruction, and the motor actuator adjusts the opening of the valve plate according to the flow demand; S4, the position sensor provides real-time feedback of the valve plate position to ensure that the valve plate reaches the target opening; S5, the pressure sensor is used to monitor the pressure change in the feed pipe section in real time. If the detected pressure is too high, the gas in the pressure regulating airbag is discharged through the exhaust device; if the detected pressure is too low, the pressure regulating airbag is inflated by the air pump to increase the pressure; S6. After the slurry valve is closed, a water hammer effect occurs in the feed pipe section. Under the action of the water hammer effect, the pressure regulating airbag actively contracts to suppress the water hammer effect and reduce the damage to the valve plate caused by the water hammer effect; When the pressure-regulating airbag actively contracts, the solenoid valve is opened, and the contraction of the pressure-regulating airbag can deliver gas to the first expansion airbag through the flexible air tube, so that the first sealing plate is in sealing contact with the feeding pipe section.

[0012] Furthermore, the method comprises: After the slurry valve is closed, the electromagnet is de-energized to release the outer shell.

[0013] Furthermore, the slurry valve also includes an alarm device and a status monitoring system; the method includes: The state monitoring system performs fault detection on the pressure sensor and the position sensor. When the pressure sensor or the position sensor fails or is abnormal, the state monitoring system sends a signal to the alarm device, and the alarm device triggers an audible and visual alarm signal.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The technical solution of the present invention improves the sealing performance of the slurry valve under high pressure difference conditions by designing the valve body, valve plate and pressure regulating device. Specifically, a pressure regulating airbag is arranged in the feed pipe section, and a first expansion airbag and a first sealing plate are arranged on the valve plate; a flexible air pipe is used to connect the first expansion airbag and the pressure regulating airbag. After closing the slurry valve, the slurry refluxes and is pressurized in the feed pipe section, the gas in the pressure regulating airbag is compressed, and enters the first expansion airbag through the flexible air pipe, and the volume of the first expansion airbag expands to abut against the feed pipe section through the first sealing plate, thereby enhancing the sealing performance of the slurry valve.

[0015] It can also be understood that the gas in the pressure-regulating airbag is compressed and the volume of the pressure-regulating airbag shrinks, which helps to reduce the air pressure in the feed pipe section, thereby reducing the impact of the high pressure difference on the sealing performance of the slurry valve and improving the stability of the slurry valve performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a discharge valve of the present invention; Figure 2 for Figure 1 A magnified view of part A in FIG. Figure 3 for Figure 1 Schematic diagram of the changing state in; Figure 4 for Figure 3 A magnified view of part B in FIG. Figure 5 It is a principle diagram of the discharge valve control method of the present invention; Illustration: 100, slurry valve; 110, valve body; 112, feed pipe section; 112a, receiving space; 112b, feed channel; 1121, limiter; 113, discharge pipe section; 114, board bin; 120, valve plate; 121, first sealing plate; 122, sealing ring; 123, spring 130, pressure regulating device; 131, first expansion airbag; 132, pressure regulating airbag; 133, flexible air tube; 134, outer shell; 135, spoiler; 136, air pump; 137, exhaust device; 138, solenoid valve; 140, actuator; 150, PLC controller; 160, position sensor; 170, pressure sensor; 180. Alarm device; 190. Status monitoring system. DETAILED DESCRIPTION

[0019] In order to make the technical purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only 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.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing 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 a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0021] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] Embodiment 1: An embodiment of the present invention provides a slurry valve 100 .

[0023] See also Figures 1 to 5 , the slurry valve 100 comprises a valve body 110, a valve plate 120 and a pressure regulating device 130; The valve body 110 has a coaxially arranged feed pipe section 112 and a discharge pipe section 113, and a plate bin 114 formed between the feed pipe section 112 and the discharge pipe section 113, and the plate bin 114 is used to store the valve plate 120; The valve plate 120 is also connected to an actuator 140 located outside the plate bin 114. Driving the actuator 140 can enable the valve plate 120 to enter the connection between the feed pipe section 112 and the discharge pipe section 113 from the plate bin 114 to cut off the feed. The pressure regulating device 130 includes a first inflation airbag 131, a pressure regulating airbag 132, and a flexible air tube 133 connecting the first inflation airbag 131 and the pressure regulating airbag 132; A first sealing plate 121 is disposed on one side of the valve plate 120 close to the feed pipe section 112, and the first expansion airbag 131 is disposed between the first sealing plate 121 and the valve plate 120; the pressure regulating airbag 132 is disposed in the feed pipe section 112; After closing the slurry valve 100 , the slurry refluxes and pressurizes in the feed pipe section 112 , the gas in the pressure-regulating airbag 132 is compressed and enters the first expansion airbag 131 through the flexible air pipe 133 , and the volume of the first expansion airbag 131 expands to abut against the feed pipe section 112 through the first sealing plate 121 .

[0024] It can be understood that the technical solution of the present invention improves the sealing performance of the slurry valve 100 under high pressure difference conditions by designing the valve body 110, the valve plate 120 and the pressure regulating device 130. Specifically, a pressure regulating airbag 132 is arranged in the feed pipe section 112, and a first expansion airbag 131 and a first sealing plate 121 are arranged on the valve plate 120; the first expansion airbag 131 and the pressure regulating airbag 132 are connected by a flexible air pipe 133.

[0025] After closing the slurry valve 100, Figure 1 As shown, the slurry refluxes and increases pressure in the feed pipe section 112, the gas in the pressure regulating airbag 132 is compressed and enters the first expansion airbag 131 through the flexible air tube 133, and the volume of the first expansion airbag 131 expands to abut against the feed pipe section 112 through the first sealing plate 121, thereby enhancing the sealing performance of the slurry valve 100.

[0026] It can also be understood that the gas in the pressure-regulating airbag 132 is compressed, and the volume of the pressure-regulating airbag 132 shrinks, which helps to reduce the air pressure in the feed pipe section 112, thereby reducing the impact of the high pressure difference on the sealing performance of the slurry valve 100 and improving the performance stability of the slurry valve 100.

[0027] Specifically, a sealing ring 122 is embedded in the first sealing plate 121 , the sealing ring 122 abuts against the feed pipe section 112 , and the sealing ring 122 is flush with the first sealing plate 121 .

[0028] It can be understood that the setting of the sealing ring 122 achieves close contact with the feed pipe section 112 to prevent leakage. And the sealing ring 122 can better adapt to the pressure difference change, so that the valve plate 120 maintains a sealed state under a high pressure difference. Further, the height of the sealing ring 122 is flush with the first sealing plate 121, and the sealing ring 122 is usually made of elastic material, and its setting can reduce the friction between the valve plate 120 and the pipe section. Furthermore, the separate setting of the sealing ring 122 is conducive to replacement and maintenance, thereby ensuring the stable operation of the system.

[0029] Furthermore, a spring 123 is disposed between the first sealing plate 121 and the valve plate 120 , and the spring 123 is fixedly connected to the first sealing plate 121 and the valve plate 120 , respectively.

[0030] It is understandable that the spring 123 can provide continuous pressure to maintain close contact between the first sealing plate 121 and the feed pipe section 112 to prevent leakage; and the elasticity of the spring 123 can compensate for small movements or errors, thereby ensuring the sealing effect.

[0031] Furthermore, the feed pipe section 112 is also formed with a receiving space 112a for receiving the pressure regulating airbag 132; an outer shell 134 is provided on one side of the pressure regulating airbag 132 close to the feed channel 112b; When the slurry valve 100 is opened, the pressure regulating airbag 132 is received in the receiving space 112a, and the slurry contacts the outer shell 134; When the slurry valve 100 is closed, the slurry flows back, and the pressure-regulating airbag 132 is separated from the receiving space 112 a due to the water hammer effect, so that the slurry is in direct contact with the pressure-regulating airbag 132 .

[0032] Specifically, when the slurry valve 100 is opened, the pressure regulating airbag 132 can be accommodated in the accommodation space 112a due to the impact force of the slurry. At this time, the slurry contacts the outer shell 134, protecting the pressure regulating airbag 132 from direct contact wear and impact.

[0033] When the slurry valve 100 is closed, the slurry flows back due to the water hammer effect (pressure wave caused by the sudden stop or change of direction of the fluid). At this time, the pressure regulating airbag 132 drives the outer shell 134 to leave the receiving space 112a, so that the slurry directly contacts the pressure regulating airbag 132 in the uncovered area of ​​the outer shell 134. This contact makes the pressure regulating airbag 132 feel the pressure change, compressing the internal gas, and the gas is transmitted to the first expansion airbag 131 through the flexible air pipe 133, thereby enhancing the sealing effect.

[0034] It is understandable that, when the valve is open, the outer shell 134 protects the pressure regulating airbag 132 from wear and impact caused by direct contact with the slurry, thereby extending the life of the airbag. When the valve is closed, the outer shell 134 can smoothly remove the pressure regulating airbag 132 from the receiving space 112a with the assistance of gravity. At this time, the pressure regulating airbag 132 directly contacts the slurry, responds to backflow and pressure changes in a timely manner, and ensures the sealing effect of the first expansion airbag 131.

[0035] Furthermore, the above arrangement utilizes the water hammer effect to ensure timely response and sealing when the slurry flows back, thereby improving the stability and reliability of the slurry valve 100.

[0036] Furthermore, if Figure 3As shown, the feed pipe section 112 is further provided with a limiter 1121, and the limiter 1121 cooperates with the outer shell 134. It can be understood that the limiter 1121 can control the position and the receiving range of the outer shell 134. The limiter 1121 cooperates with the outer shell 134, and the outer shell 134 can be positioned within a specific range under the constraint of the limiter 1121.

[0037] When the slurry valve 100 is opened, the outer shell 134 protects the pressure-regulating airbag 132 and ensures that the pressure-regulating airbag 132 is contained in the containing space 112a to reduce the squeezing of the slurry, thereby allowing the gas in the pressure-regulating airbag 132 to be fully and effectively released.

[0038] Furthermore, a plurality of spoilers 135 are disposed on one side of the outer shell 134 close to the feed channel 112 b , and the spoilers 135 are inclined toward the valve plate 120 .

[0039] It can be understood that a plurality of inclined spoilers 135 are provided on the outer shell 134 to reduce direct impact and wear on the valve plate 120 by guiding and dispersing the slurry flow. After closing the slurry valve 100 , the slurry backflow can cause the slurry to act on the side of the spoiler 135 close to the shell, thereby driving the outer shell 134 to move, so that the pressure-regulating airbag 132 can smoothly leave the receiving space 112 a .

[0040] Furthermore, the pressure regulating device 130 further includes an air pump 136 and an exhaust device 137 . The air pump 136 and the exhaust device 137 are disposed outside the valve body 110 and are communicated with the flexible air pipe 133 , respectively.

[0041] It can be understood that the inflation pump 136 and the exhaust device 137 are respectively connected to the flexible air pipe 133 for adjusting the air pressure in the pressure-regulating airbag 132 .

[0042] The pressure regulating airbag 132 or the first expansion airbag 131 is inflated by the air pump 136 to increase the internal pressure, so as to quickly increase the pressure of the airbag when needed and enhance the sealing effect.

[0043] The exhaust device 137 is used to release the gas in the pressure regulating airbag 132 or the first inflation airbag 131 to reduce the internal pressure.

[0044] Optionally, the exhaust device 137 may be an electric exhaust valve, a pneumatic exhaust valve or a proportional valve. Optionally, a solenoid valve 138 is further provided between the first expansion airbag 131 and the pressure-regulating airbag 132 .

[0045] Embodiment 2: A control method of a slurry valve 100, using the slurry valve 100 as described above, the actuator 140 includes a motor actuator, the slurry valve 100 also includes a PLC controller 150, a position sensor 160 and a pressure sensor 170, the position sensor 160 is used to monitor the position of the valve plate 120 in real time, and the pressure sensor 170 is used to monitor the pressure in the feed pipe section 112 in real time; a solenoid valve 138 is also provided between the first expansion airbag 131 and the pressure regulating airbag 132; The method comprises: S1, start the power supply, and the PLC controller 150 performs a self-test, which includes checking the power-on status of the motor actuator, the sensor, the solenoid valve 138, the air pump 136, and the status monitoring system 190; after confirming that all the equipment is working normally, the slurry valve 100 enters the standby working state; S2, the PLC controller 150 receives a flow demand signal, and determines the slurry flow rate and the position requirements of the valve plate 120 according to the flow demand signal; S3, the PLC controller 150 issues a command, and the motor actuator adjusts the opening of the valve plate 120 according to the flow demand; S4, the position sensor 160 provides real-time feedback of the position of the valve plate 120 to ensure that the valve plate 120 reaches the target opening; S5. The pressure sensor 170 is used to monitor the pressure change in the feed pipe section 112 in real time. If the detected pressure is too high, the gas in the pressure regulating airbag 132 is discharged through the exhaust device 137; if the detected pressure is too low, the pressure regulating airbag 132 is inflated by the air pump 136 to increase the pressure; S6. After the slurry valve 100 is closed, a water hammer effect occurs in the feed pipe section 112. Under the action of the water hammer effect, the pressure regulating airbag 132 actively contracts to suppress the water hammer effect and reduce the damage to the valve plate 120 caused by the water hammer effect. When the pressure-regulating airbag 132 actively contracts, the solenoid valve 138 is opened, and the contraction of the pressure-regulating airbag 132 can deliver gas to the first expansion airbag 131 through the flexible air pipe 133 , so that the first sealing plate 121 is in sealing contact with the feeding pipe section 112 .

[0046] It can be understood that the above method utilizes the linkage between the pressure-regulating airbag 132 and the first expansion airbag 131, controls the gas flow through the solenoid valve 138, and enables the first expansion airbag 131 to push the sealing plate tightly against the feed pipe section 112, thereby greatly improving the sealing performance of the slurry valve 100 under high pressure difference conditions and effectively reducing the risk of leakage.

[0047] The PLC controller 150 is combined with the position sensor 160 and the pressure sensor 170 to realize real-time monitoring and adjustment of the position and pressure of the valve plate 120, thereby ensuring accurate operation and efficient operation of the valve. The high degree of automation reduces human intervention and the risk of operational errors.

[0048] The pressure regulating airbag 132 actively contracts under the water hammer effect to absorb excessive pressure fluctuations, thereby avoiding the impact and damage of the water hammer on the valve plate 120 and related components, and significantly extending the service life of the equipment.

[0049] The PLC controller 150 dynamically adjusts the opening of the valve plate 120 and the airbag pressure according to the flow demand signal input from the outside, flexibly adapts to different working conditions, and improves the adaptability and reliability of the system.

[0050] By actively controlling the pressure-regulating airbag 132 and the water hammer suppression mechanism, the valve plate 120, the pressure-regulating airbag 132 and other key components are effectively protected, wear and impact are reduced, and the service life of the entire slurry valve 100 is extended.

[0051] The pressure sensor 170 is used to monitor the pressure of the feed pipe section 112 in real time, and the pressure is dynamically adjusted through the exhaust device 137 and the air pump 136 to maintain the pressure balance of the system and ensure the stability of the system operation.

[0052] The PLC controller 150 realizes coordinated control of components such as the motor actuator, the solenoid valve 138, and the air pump 136, forming a closed-loop feedback system. The system responds quickly and is highly intelligent, greatly improving work efficiency. Furthermore, the opening of the valve plate 120 is accurately controlled by the motor actuator to reduce unnecessary energy consumption. In addition, the self-check function of the PLC controller 150 ensures that the equipment operates normally before startup, and dynamically adjusts the pressure and suppresses the water hammer effect to further reduce system failures and safety hazards.

[0053] Further, the limiting member 1121 is an electromagnet, and the method includes: After the slurry valve 100 is closed, the electromagnet is de-energized to release the outer shell 134 .

[0054] It is understandable that by de-energizing and releasing the electromagnet after the slurry valve 100 is closed, the system can automatically optimize the response of the outer shell 134 and the pressure regulating airbag 132, thereby enhancing the sealing, suppressing the water hammer effect, and improving the stability and reliability of the system.

[0055] Furthermore, the slurry valve 100 further includes an alarm device 180 and a state monitoring system 190; the method includes: The state monitoring system 190 performs fault detection on the pressure sensor 170 and the position sensor 160. When the pressure sensor 170 or the position sensor 160 fails or is abnormal, the state monitoring system 190 sends a signal to the alarm device 180, and the alarm device 180 triggers an audible and visual alarm signal.

[0056] It is understandable that by integrating the alarm device 180 and the status monitoring system 190 in the slurry valve 100, sensor failure or abnormality can be detected in real time, and the operator can be alerted by sound and light alarms. This design improves the safety, reliability and maintenance efficiency of the system, ensuring that the slurry valve 100 can operate stably under normal and abnormal conditions. The system not only provides operators with quick response signals, but also reduces downtime caused by equipment failure, improving the continuity and safety of production.

[0057] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slurry valve, characterized in that: It includes a valve body, a valve plate and a pressure regulating device; The valve body comprises a coaxially arranged feed pipe section and a discharge pipe section, and a plate bin formed between the feed pipe section and the discharge pipe section, wherein the plate bin is used to store the valve plate; The valve plate is also connected to an actuator located outside the silo, and driving the actuator can enable the valve plate to enter the connection between the feed pipe section and the discharge pipe section from the silo to cut off the feed; The pressure regulating device comprises a first expansion airbag, a pressure regulating airbag and a flexible air tube connecting the first expansion airbag and the pressure regulating airbag; A first sealing plate is disposed on one side of the valve plate close to the feed pipe section, and the first expansion airbag is disposed between the first sealing plate and the valve plate; the pressure regulating airbag is disposed in the feed pipe section; After closing the slurry valve, the slurry refluxes and pressurizes in the feed pipe section, the gas in the pressure-regulating airbag is compressed and enters the first expansion airbag through the flexible air pipe, and the volume of the first expansion airbag expands to abut the feed pipe section through the first sealing plate.

2. The slurry valve according to claim 1, characterized in that: A sealing ring is embedded in the first sealing plate, the sealing ring abuts against the feed pipe section, and the sealing ring is flush with the height of the first sealing plate.

3. The slurry valve according to claim 2, characterized in that: A spring is further arranged between the first sealing plate and the valve plate, and the spring is fixedly connected to the first sealing plate and the valve plate respectively.

4. The slurry valve according to claim 3, characterized in that: The feed pipe section is also formed with a receiving space for receiving the pressure regulating airbag; an outer shell is provided on one side of the pressure regulating airbag close to the feed channel; When the slurry valve is opened, the pressure regulating airbag is accommodated in the accommodation space, and the slurry contacts the outer shell; When the slurry valve is closed, the slurry flows back, and the pressure-regulating airbag is separated from the containing space due to the water hammer effect, so that the slurry is in direct contact with the pressure-regulating airbag.

5. The slurry valve according to claim 4, characterized in that: The feed pipe section is also provided with a limiting member, and the limiting member cooperates with the outer shell.

6. The slurry valve according to claim 5, characterized in that: A plurality of spoilers are also arranged on one side of the outer shell body close to the feed channel, and the spoilers are arranged obliquely toward the valve plate.

7. The slurry valve according to claim 6, characterized in that: The pressure regulating device also includes an air pump and an exhaust device. The air pump and the exhaust device are placed outside the valve body and are communicated with the flexible air pipe respectively.

8. A method for controlling a slurry valve, applied to the slurry valve according to claim 7, characterized in that: The actuator includes a motor actuator, and the slurry valve also includes a PLC controller, a position sensor and a pressure sensor. The position sensor is used to monitor the position of the valve plate in real time, and the pressure sensor is used to monitor the pressure in the feed pipe section in real time. A solenoid valve is also provided between the first expansion airbag and the pressure regulating airbag. The method comprises: Start the power supply, and the PLC controller performs self-test, which includes checking the power-on status of the motor actuator, sensor, solenoid valve, air pump and status monitoring system; after confirming that all equipment is working normally, the slurry valve enters the standby working state; The PLC controller receives a flow demand signal, and determines the slurry flow rate and valve plate position requirements according to the flow demand signal; The PLC controller issues a command, and the motor actuator adjusts the opening of the valve plate according to the flow demand; The position sensor provides real-time feedback of the valve plate position to ensure that the valve plate reaches the target opening; The pressure sensor is used to monitor the pressure change in the feed pipe section in real time. If the detected pressure is too high, the gas in the pressure regulating airbag is discharged through the exhaust device; if the detected pressure is too low, the pressure regulating airbag is inflated by the air pump to increase the pressure; After the slurry valve is closed, a water hammer effect occurs in the feed pipe section. Under the action of the water hammer effect, the pressure regulating airbag actively contracts to suppress the water hammer effect and reduce the damage to the valve plate caused by the water hammer effect. When the pressure-regulating airbag actively contracts, the solenoid valve is opened, and the contraction of the pressure-regulating airbag can deliver gas to the first expansion airbag through the flexible air tube, so that the first sealing plate is in sealing contact with the feeding pipe section.

9. The control method according to claim 8, characterized in that: The limiting member is an electromagnet, and the method comprises: After the slurry valve is closed, the electromagnet is de-energized to release the outer shell.

10. The control method according to claim 9, characterized in that: The slurry valve also includes an alarm device and a status monitoring system; the method includes: The state monitoring system performs fault detection on the pressure sensor and the position sensor. When the pressure sensor or the position sensor fails or is abnormal, the state monitoring system sends a signal to the alarm device, and the alarm device triggers an audible and visual alarm signal.

Images