A pneumatic manual spring-loaded locking switching device

Abstract

The present invention provides a pneumatic manual elastic locking switching device, which relates to the technical field of pneumatic actuators, and comprises: a pneumatic actuator, in which a first valve stem is arranged, a manual actuator is arranged below the pneumatic actuator, and a second valve stem is arranged in the manual actuator; a connecting piece, in which the connecting piece is symmetrically arranged at one end opposite to the first valve stem and the second valve stem, and when the two connecting pieces are in a closed state, the first valve stem and the second valve stem are in a relatively clamped state; a docking piece, in which the docking piece is symmetrically arranged inside the manual actuator, and when the two connecting pieces are in a separated state, the two docking pieces are transmission-connected with the outer wall of the second valve stem, and the manual actuator cooperates with the docking piece to drive the second valve stem to operate independently; when the present invention is in operation, the connection between the first valve stem and the second valve stem is released to drive the second valve stem to operate independently, thereby avoiding the need to overcome the elastic force of the spring to make adjustments during actual operation, thereby improving the convenience of operation.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic actuators, and in particular to a pneumatic manual spring-loaded locking switching device. Background Art

[0002] The working principle of pneumatic actuators is based on air pressure drive. By controlling the inflow and outflow and changes of air pressure, the actuator is driven to complete the corresponding action. The main components of pneumatic actuators include cylinders, pistons, push rods, etc. The piston in the cylinder moves with the change of the pressure difference on both sides of the cylinder, thereby pushing the valve stem to perform linear or rotational motion.

[0003] In industrial automation systems, pneumatic actuators are usually in automatic control and receive instructions from the control system to perform actions. However, in some special cases, such as maintenance, overhaul or emergency situations, pneumatic actuators need to be manually operated, but the existing pneumatic manual switching structure is not very stable and laborious to use, which is not conducive to the convenience of operation.

[0004] The Chinese patent application number CN202020964703.7 discloses a side-mounted manual pneumatic integrated actuator, including a cylinder body and a valve stem, the valve stem is located in the cylinder body and is connected to a valve plug; a protective shell is installed at the bottom of the cylinder body, the lower part of the valve stem passes through the protective shell, and a clutch assembly and a manual assembly are provided on the protective shell. The clutch assembly includes a sleeve, a brake disc and a brake block. The sleeve is coaxial with the valve stem and rotatably arranged in the protective shell. The brake disc and the brake block are linked and arranged inside the protective shell. The brake disc and the sleeve are interference fit. The brake disc is provided with a first through hole, the brake block is provided with a first threaded portion, and the valve stem is provided with a second threaded portion. An arc hole is opened on the side wall of the sleeve, and a push rod connected to the brake disc is provided through the arc hole. When the brake disc rotates, the brake block drives the brake block to approach or move away from the valve stem; the manual assembly is used to drive the clutch assembly to rotate as a whole. The device integrates manual and pneumatic as one, and can manually control the opening and closing of the valve when the pneumatic fails.

[0005] Although the above device closes the regulating valve through a manual device when the pneumatic actuator fails, when the above manual actuator is used in an actual pneumatic actuator, the manual actuator needs to overcome the elastic force of the spring in the pneumatic actuator in the process of driving the valve stem up and down, and manual operation is time-consuming and laborious. At the same time, if the pneumatic actuator malfunctions during manual operation, there is a safety hazard.

[0006] In addition, during the operation of the pneumatic actuator, when the valve plug moves in the cylinder body, the valve plug and the cylinder body will rub against each other and cause wear. Therefore, during long-term use, the connection between the valve plug and the cylinder body cannot fit tightly and is prone to air leakage, which makes it impossible for the pneumatic actuator to accurately control the opening size of the regulating valve connected to it when adjusting the opening of the regulating valve.

[0007] At the same time, the liquid passing through the regulating valve will impact the valve core, causing the valve core and the valve stem to generate an upward extrusion force, causing the valve core to float up and down, and then making the flow of the regulating valve connected to the pneumatic actuator uncontrollable.

[0008] In view of this, there is an urgent need for a pneumatic and manually-activated locking switching device to solve the above-mentioned technical problems. Summary of the invention

[0009] The object of the present invention is to provide a pneumatic and manually-operated locking and switching device to solve the technical problems raised in the above-mentioned background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions: A pneumatic manual spring-loaded locking switching device, the pneumatic manual spring-loaded locking switching device comprising: A pneumatic actuator, wherein a first valve stem is disposed in the pneumatic actuator, a manual actuator is disposed below the pneumatic actuator, and a second valve stem is disposed in the manual actuator; Also included are docking assemblies and connectors, wherein: A docking piece, wherein the docking piece is symmetrically arranged inside the manual actuator. When the two connecting pieces are in a separated state, the two docking pieces are drivingly connected to the outer wall of the second valve stem. The manual actuator cooperates with the docking piece to drive the second valve stem to operate independently. A connecting piece, the connecting piece is symmetrically arranged at an end opposite to the first valve stem and the second valve stem, the connecting piece includes a connecting block, a telescopic piece is arranged on the outer side of the connecting block, the telescopic piece is slidably connected with the limiting slide groove, a connecting hose is arranged on the outer side of the telescopic piece, the connecting hose is connected with the docking piece through a connecting channel provided on the connecting cylinder, when the two connecting pieces are in a closed state, the first valve stem and the second valve stem are in a relatively clamped state, and the pneumatic actuator drives the first valve stem and the second valve stem to work together.

[0011] Preferably, the pneumatic actuator comprises a cylinder body, an elastic part is provided on the inner top of the cylinder body, a piston member is provided at the bottom of the elastic part, the peripheral side of the piston member is connected to the inner wall of the cylinder body through a sealing ring, and the lower surface of the piston member is connected to the first valve stem; The bottom of the cylinder body is provided with an air delivery port, through which compressed gas is introduced into the cylinder body to drive the piston member to move upward, and through which compressed air in the cylinder body is extracted to drive the piston member to move downward.

[0012] Preferably, the manual actuator comprises a housing, a driven part is arranged inside the housing, an active part is transmission-connected to the outside of the driven part, a hand wheel is arranged at the end of the active part, and the hand wheel is located outside the housing; The second valve stem is located in the middle of the driven part. When the connecting member is in a separated state, the driven part rotates to drive the second valve stem to operate alone.

[0013] Preferably, a connecting cylinder is provided on the top of the driven part, symmetrically distributed limiting blocks are provided on the bottom of the connecting cylinder, the docking piece is arranged between two limiting blocks, and the docking piece is connected to the limiting blocks in a limiting sliding manner.

[0014] Preferably, a limiting sliding groove opposite to the connecting member is provided on the inner wall of the connecting cylinder, and the connecting member slides up and down along the limiting sliding groove.

[0015] Preferably, the docking member comprises a docking block, the docking block is arranged between two limit blocks, the docking block is slidably connected to the limit blocks, a pushing member is provided on the outer side of the docking block, and the pushing member is connected to the connecting channel.

[0016] Preferably, the first valve stem and the second valve stem are each provided with a clamping portion at one end opposite to the clamping portion, and the connecting block is provided with a clamping portion on one side facing the clamping portion; When the two connection blocks are in a closed state, the clamping portion and the clamping portion are in a clamping state, and when the two connection blocks are in a separated state, the clamping portion and the clamping portion are in a non-contact state.

[0017] Preferably, a pressure-bearing member is provided at one end of the first valve stem opposite to the second valve stem, and both ends of the pressure-bearing member are rotatably connected to the first valve stem and the second valve stem respectively; A first valve hole is arranged on the top of the pressure-bearing member, and a second valve hole is arranged on the outer side of the pressure-bearing member.

[0018] Preferably, an air passage is provided on the first valve stem, one end of the air passage is communicated with the sealing ring, and the other end of the air passage is connected with the first valve hole.

[0019] Preferably, a valve core is provided at one end of the second valve stem extending out of the housing, an elastic member is provided on the top of the valve core, and the elastic member is connected to a regulating valve arranged below the manual actuator.

[0020] Technical effects and advantages of the present invention: 1. The present invention realizes flexible switching between the pneumatic actuator and the manual actuator by providing a docking piece and a connecting block. When manual intervention is required, the clamping state between the first valve stem and the second valve stem can be quickly released by driving the electromagnetic component, and a transmission connection between the docking block and the second valve stem can be established. In this way, the operator can accurately adjust the distance between the valve core and the valve port of the regulating valve by rotating the hand wheel, without having to overcome the elastic force of the elastic part in the pneumatic actuator, thereby saving the time and energy required for manual adjustment.

[0021] 2. The present invention can timely detect excessive wear of the sealing ring by arranging an air pressure sensor and a pressure sensor in the cylinder body and monitoring the data changes. When the sealing ring is worn and causes gas leakage, the control system will immediately adjust the opening and closing states of the first valve hole and the second valve hole, and lock the position of the second valve stem through the docking block, providing clear instructions and convenient operating conditions for subsequent maintenance personnel. Maintenance personnel can handle worn sealing rings more efficiently and safely, reducing maintenance costs and time.

[0022] 3. The present invention sets a pressure-bearing part and a docking part, and quickly closes the first valve hole and the second valve hole and locks the position of the second valve stem when the floating of the valve stem is detected. At the same time, the gas inside the cylinder is extracted through an external air supply device, so that the first valve stem moves downward and exerts pressure on the pressure-bearing part, forcing the pressure-bearing part to deform and generate downward pressure on the second valve stem, further limiting the movement of the second valve stem. In this way, even if the liquid exerts a large impact force on the valve core, it can ensure that the flow control of the regulating valve has a high degree of stability and controllability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a structural schematic diagram of the pneumatic actuator of the present invention; Figure 3 It is a structural schematic diagram of the manual execution device of the present invention; Figure 4 It is a structural schematic diagram of the connecting piece of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at A in the middle; Figure 6 It is a schematic structural diagram of the first valve stem and the second valve stem of the present invention; Figure 7 It is a structural schematic diagram of the pressure-bearing member of the present invention; Figure 8 It is a schematic diagram of the working state of the connecting piece of the present invention in a separated state.

[0024] The accompanying drawings are marked as follows: 1. pneumatic actuator; 101. cylinder body; 102. elastic part; 103. piston member; 104. sealing ring; 105. air delivery port; 2. manual actuator; 201. housing; 202. driven part; 203. active part; 204. hand wheel; 3. connecting cylinder; 4. limit block; 5. docking member; 501. docking block; 502. pushing member; 6. connecting member; 601. connecting block; 602. telescopic member; 603. connecting hose; 604. connecting channel; 7. first valve stem; 8. second valve stem; 9. valve core; 10. elastic member; 11. clamping part; 12. pressure member; 13. first valve hole; 14. second valve hole; 15. airway. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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.

[0026] Embodiment 1 Reference Figures 1 to 8 As shown, the present invention provides a pneumatic manual elastic locking switching device, which mainly includes a pneumatic actuator 1, a manual actuator 2 and a regulating valve arranged below the manual actuator 2.

[0027] Reference Figure 1 to Figure 2 As shown, the pneumatic actuator 1 includes a cylinder body 101, an elastic portion 102 is provided at the inner top of the cylinder body 101, a piston member 103 is provided at the bottom of the elastic portion 102, the circumference of the piston member 103 is connected to the inner wall of the cylinder body 101 through a sealing ring 104, and a first valve stem 7 is provided on the lower surface of the piston member 103.

[0028] An air inlet 105 is provided at the bottom of the cylinder body 101. Compressed gas is introduced into the cylinder body 101 through the air inlet 105 to drive the piston 103 to drive the first valve stem 7 to move upward. The compressed air in the cylinder body 101 is extracted through the air inlet 105 to drive the piston 103 to drive the first valve stem 7 to move downward.

[0029] Reference Figures 3 to 6 As shown, the manual actuator 2 includes a housing 201, a driven part 202 is provided inside the housing 201, a second valve stem 8 is provided in the middle of the driven part 202, an active part 203 is transmission-connected to the outside of the driven part 202, a hand wheel 204 is provided at the end of the active part 203, and the hand wheel 204 is located outside the housing 201. The hand wheel 204 is rotated to drive the driven part 202 to rotate, and the driven part 202 drives the second valve stem 8 to move up and down.

[0030] A valve core 9 is disposed at one end of the second valve stem 8 extending out of the housing 201 . An elastic member 10 is disposed on the top of the valve core 9 . The elastic member 10 is connected to a regulating valve disposed below the manual actuator 2 .

[0031] The transmission structure formed by the active part 203 and the driven part 202 in this embodiment includes a bevel gear transmission structure, and the specific reference is Figure 3 As shown, the active part 203 is a small bevel gear, and the driven part 202 is a large bevel gear. The transmission ratio between the two can be set according to actual needs so as to more accurately control the movement of the second valve stem 8.

[0032] Reference Figures 3 to 6 As shown, a connecting cylinder 3 is provided on the top of the driven part 202, and symmetrically distributed limit blocks 4 are provided on the bottom of the connecting cylinder 3. A docking piece 5 is provided between the two limit blocks 4, and the docking piece 5 is connected to the limit blocks 4 in a limited sliding connection; a limited sliding groove is provided on the inner wall of the connecting cylinder 3, and a connecting piece 6 is provided inside the limiting sliding groove, and the connecting piece 6 slides up and down along the limiting sliding groove.

[0033] Reference Figures 3 to 6 As shown, the connecting member 6 includes a connecting block 601, a telescopic member 602 is provided on the outer side of the connecting block 601, the telescopic member 602 is slidably connected to the limiting slide groove, a connecting hose 603 is provided on the outer side of the telescopic member 602, and the connecting hose 603 is connected to the docking member 5 through a connecting channel 604 opened on the connecting tube 3.

[0034] The telescopic member 602 includes an electromagnetic telescopic member, which includes a sliding block, a telescopic sleeve is provided on the sliding block, and electromagnetic members are provided at both ends of the telescopic sleeve. The telescopic sleeve is driven to telescope by controlling the magnetic change of the electromagnetic member. When the telescopic sleeve is retracted, the gas inside the telescopic sleeve enters the docking member 5 through the connecting hose 603 and the connecting channel 604, so that the docking member 5 and the second valve stem 8 are connected in transmission.

[0035] It should be noted that: a clamping portion 11 is provided at the opposite end of the first valve stem 7 and the second valve stem 8, and a clamping portion is provided on the side of the connecting block 601 facing the clamping portion 11; when the two connecting blocks 601 are in a closed state, the clamping portion 11 and the clamping portion are in a clamping state, and when the two connecting blocks 601 are in a separated state, the clamping portion 11 and the clamping portion are in a non-contact state.

[0036] Reference Figures 3 to 6 As shown, the docking member 5 includes a docking block 501, which is arranged between two limit blocks 4, and the docking block 501 is slidingly connected to the limit blocks 4. A pushing member 502 is provided on the outer side of the docking block 501, and the pushing member 502 is connected to the connecting channel 604.

[0037] The pusher 502 includes a pneumatic telescopic rod, the fixed end of which is connected to the connecting channel 604, and the output end of which is connected to the docking block 501. After the gas enters the interior of the pneumatic telescopic rod, the output end pushes the docking block 501 to move toward the second valve stem 8, and finally the docking block 501 and the second valve stem 8 complete the transmission connection.

[0038] The two butt joint blocks 501 have a thread groove at one end opposite to the other end, and the second valve stem 8 has a threaded portion opposite to the thread groove. Figure 4 As shown, when the two docking blocks 501 move relative to each other, the thread groove on the docking block 501 is drivingly connected with the threaded portion on the second valve stem 8 .

[0039] In the initial state, the two connection blocks 601 inside the connection tube 3 are in a closed state, at which time the first valve stem 7 and the second valve stem 8 are in a relatively clamped state, while the two docking blocks 501 inside the connection tube 3 are in a separated state.

[0040] During use, the external air supply device fills compressed air into the cylinder 101 through the air supply port 105, so as to adjust the vertical position of the piston 103 in the cylinder 101, and then adjust the distance between the valve core 9 and the valve port of the regulating valve, so as to achieve effective control of the flow rate when the liquid flows through the regulating valve.

[0041] During the operation of the pneumatic actuator 1, if manual intervention is required, the electromagnetic component on the connecting tube 3 is activated to drive the telescopic component 602 to contract, and the telescopic component 602 further causes the two connecting blocks 601 located at the opposite ends of the first valve stem 7 and the second valve stem 8 to move toward each other until the first valve stem 7 and the second valve stem 8 are released from the state of relative engagement. The technical details of the electromagnetic component driving the connecting block 601 to move belong to the scope of the existing technology, so it is described in detail here.

[0042] At the same time, during the contraction of the telescopic member 602, the internal gas is introduced into the pushing member 502 through the connecting hose 603 and the connecting channel 604, causing the pushing member 502 to extend. The pushing member 502 pushes the docking block 501 to move along the slide defined by the two limit blocks 4 until the two docking blocks 501 located below the connecting block 601 successfully establish a transmission connection with the first valve stem 7.

[0043] It is worth noting that in the present embodiment, when the two connecting blocks 601 perform the clamping action on the first valve stem 7 and the second valve stem 8, the relative end faces of the two are in contact with each other, which means that by setting the relative distance between the docking block 501 and the second valve stem 8, it is possible to achieve that before the two connecting blocks 601 and the clamping portion 11 are completely released from the clamping relationship, the two docking blocks 501 have already established an effective transmission connection with the second valve stem 8.

[0044] After the transmission connection between the docking block 501 and the first valve stem 7 is established, the operator can drive the active part 203 to rotate by rotating the hand wheel 204, and the active part 203 drives the driven part 202 to rotate. Since one end of the connecting cylinder 3 is fixedly connected to the driven part 202 and the other end is rotatably connected to the housing 201, the rotation of the driven part 202 will synchronously drive the docking block 501 to rotate. The threaded groove on the docking block 501 will drive the second valve stem 8 to move up and down, thereby realizing the precise adjustment of the distance between the valve core 9 and the valve port of the regulating valve.

[0045] In addition, it should be emphasized that since the elastic element on the valve core 9 is fixedly connected to the regulating valve, when the docking block 501 rotates around the second valve stem 8, the elastic element will exert a limiting effect on the second valve stem 8 to ensure that it can only move in the vertical direction.

[0046] To sum up, when performing manual operation, the up and down moving distance of the second valve stem 8 is adjusted separately by contacting the clamping state between the first valve stem 7 and the second valve stem 8. On the one hand, it is avoided that during actual operation, there is a need to overcome the elastic force of the elastic part 102 in the pneumatic actuator 1, thereby saving the time and energy required for manual adjustment; on the other hand, since there is a certain buffer gap between the first valve stem 7 and the second valve stem 8, when the up and down moving distance of the second valve stem 8 is adjusted separately, even if the pneumatic actuator 1 malfunctions, the impact of the first valve stem 7 on the second valve stem 8 will not be too large, thereby improving the safety of the staff during manual operation to a certain extent.

[0047] After the manual operation is completed, the electromagnetic component drives the connecting block 601 to move toward the first valve stem 7 and the second valve stem 8, so that the two connecting blocks 601 are finally in a closed state again, and the two docking blocks 501 are in a separated state again.

[0048] Embodiment 2 Although the above structure can improve the efficiency of manual operation, it is found in actual use that due to the needs of actual production operations, the amount of compressed gas filled into the cylinder 101 needs to be adjusted frequently, which will cause friction and wear between the piston 103 and the cylinder 101 over time, causing the connection between the piston 103 and the cylinder 101 to not fit tightly and easily leak, resulting in the pneumatic actuator 1 adjusting the opening of the regulating valve. The size of the opening of the regulating valve cannot be accurately controlled. Therefore, this embodiment makes further improvements to the above embodiment.

[0049] Reference Figures 6 to 8 As shown, a pressure-bearing piece 12 is provided at the end opposite to the first valve stem 7 and the second valve stem 8, and the two ends of the pressure-bearing piece 12 are rotatably connected to the first valve stem 7 and the second valve stem 8 respectively; a first valve hole 13 is provided at the top of the pressure-bearing piece 12, and a second valve hole 14 is provided on the outer side of the pressure-bearing piece 12.

[0050] The pressure-bearing member 12 includes a hollow rubber pad. Solenoid valves are provided in the first valve hole 13 and the second valve hole 14 on the hollow rubber pad. The opening and closing of the first valve hole 13 and the second valve hole 14 can be controlled and adjusted by controlling the solenoid valves.

[0051] Reference Figures 6 to 8 As shown, an air passage 15 is provided on the first valve stem 7 , one end of the air passage 15 is communicated with the sealing ring 104 , and the other end of the air passage 15 is connected with the first valve hole 13 .

[0052] The cylinder 101 is provided with an air pressure sensor, which is specifically arranged in the lower surface area of ​​the piston assembly. In addition, a pressure sensor is provided at the connection between the piston assembly and the elastic part 102. It is worth noting that the value recorded by the air pressure sensor is inversely proportional to the value recorded by the pressure sensor.

[0053] In the initial state, the first valve hole 13 on the pressure-bearing member 12 is in a closed state, the pressure-bearing member 12 and the airway 15 are in a non-connected state, the second valve hole 14 on the pressure-bearing member 12 is in an open state, and the pressure-bearing member 12 and the connecting tube 3 are in a connected state.

[0054] In actual application, the background control system is responsible for monitoring the data of the air pressure sensor and the pressure sensor provided on the cylinder body 101, and based on this, it is evaluated whether there is a problem of excessive wear of the sealing ring 104 on the piston assembly.

[0055] Specifically, when the external air supply device is not in operation, if the control system observes that the reading of the air pressure sensor in the cylinder 101 continues to decrease, while the reading of the pressure sensor gradually increases, this reverse change trend indicates that the sealing ring 104 of the piston assembly has been significantly worn. This wear condition causes the compressed gas below the piston assembly to leak to the upper part, thereby inducing the elastic part 102 to stretch.

[0056] When the control system identifies signs of excessive wear on the sealing ring 104, it immediately controls the first valve hole 13 to be in an open state, the pressure-bearing member 12 and the airway 15 to be in a connected state, and controls the second valve hole 14 to be in a closed state, and the pressure-bearing member 12 and the connecting tube 3 to be in a non-connected state. In addition, the control system also controls the two connecting blocks 601 in the connecting tube 3 to be in a separated state, and the two corresponding docking blocks 501 to be in a mutually closed state. The two docking blocks 501 in the closed state lock the position of the second valve stem 8, preparing for subsequent maintenance personnel to intervene in the pneumatic actuator.

[0057] After the docking block 501 is locked, the control system notifies the maintenance personnel to go to the location of the pneumatic actuator 1 and handle the worn sealing ring 104 through the manual actuator 2. The operation steps are as follows: the maintenance personnel rotates the hand wheel 204 to cause the second valve stem 8 to move upward, and its top end applies pressure to the pressure-bearing part 12, forcing the internal gas of the pressure-bearing part 12 to be injected into the sealing ring 104 through the air channel 15, causing it to expand and come into close contact with the inner wall of the cylinder body 101, thereby reducing the precision loss of the pneumatic actuator in the control of the regulating valve opening caused by severe wear of the sealing ring 104.

[0058] Embodiment 3 In actual application, since the liquid flowing in the regulating valve generally flows from bottom to top, this flow direction causes the liquid to impact the valve core 9, thereby generating an upward squeezing force between the valve core 9 and the valve stem, causing the valve stem to float up and down. This phenomenon directly affects the controllability of the flow rate of the regulating valve connected to the pneumatic actuator 1.

[0059] When the control system detects that the external air supply device is in a non-working state, if the values ​​detected by the air pressure sensor and the pressure sensor inside the cylinder 101 show obvious fluctuations, this usually means that the impact force of the liquid flowing through the regulating valve on the valve core 9 exceeds the normal range, thereby exacerbating the up and down floating of the valve stem.

[0060] When the control system detects that the valve stem floats up and down, the first valve hole 13 and the second valve hole 14 are controlled to be closed at the same time. At this time, the pressure-bearing member 12 can be regarded as a buffer medium. At the same time, the two connecting blocks 601 located inside the connecting tube 3 are controlled to be in a separated state, and the two corresponding docking blocks 501 are closed to form a locking mechanism for the position of the second valve stem 8, ensuring that the height position of the second valve stem 8 remains fixed.

[0061] After the docking block 501 successfully locks the position of the second valve stem 8, the external gas supply device extracts the gas inside the cylinder 101 through the gas delivery port 105, drives the first valve stem 7 downward and applies pressure to the pressure-bearing member 12, the pressure-bearing member 12 deforms, and the pressure-bearing member 12 exerts downward pressure on the second valve stem 8, effectively restricting the movement of the top of the second valve stem 8, and avoiding the deflection of the second valve stem 8 caused by the thrust of the liquid on the valve core 9. Through the above measures, it is ensured that the flow control of the regulating valve has a high degree of stability and controllability.

[0062] In summary, the present invention provides convenience for subsequent maintenance operations by setting the docking member 5 and the pressure member 12. When the sealing ring 104 is excessively worn, the opening and closing states of the first valve hole 13 and the second valve hole 14 are adjusted, and the docking block 501 locks the position of the second valve stem 8. Maintenance personnel can handle the worn sealing ring 104 more efficiently and safely, reducing maintenance costs and time; when the valve stem floats up and down, the coordination of the docking member 5 and the pressure member 12, as well as the subsequent locking of the position of the second valve stem 8 and the deformation control of the pressure member 12, effectively avoids the flow control instability caused by the floating of the valve stem, which not only improves the flow control accuracy of the regulating valve, but also ensures the reliability of the pneumatic actuator in the opening control of the regulating valve.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pneumatic manual spring-loaded locking switching device, characterized in that: It includes: A pneumatic actuator (1), wherein a first valve stem (7) is provided in the pneumatic actuator (1), a manual actuator (2) is provided below the pneumatic actuator (1), and a second valve stem (8) is provided in the manual actuator (2); It also includes a docking assembly (5) and a connecting piece (6), wherein: A docking member (5), wherein the docking member (5) is symmetrically arranged inside the manual actuator (2); when the two connecting members (6) are in a separated state, the two docking members (5) are drivingly connected to the outer wall of the second valve stem (8); the manual actuator (2) cooperates with the docking member (5) to drive the second valve stem (8) to operate independently; A connecting member (6), the connecting member (6) is symmetrically arranged at an end opposite to the first valve stem (7) and the second valve stem (8), the connecting member (6) comprises a connecting block (601), a telescopic member (602) is arranged on the outer side of the connecting block (601), the telescopic member (602) is slidably connected to the limiting slide groove, a connecting hose (603) is arranged on the outer side of the telescopic member (602), and the connecting hose (603) is connected to the docking member (5) through a connecting channel (604) provided on the connecting cylinder (3); when the two connecting members (6) are in a closed state, the first valve stem (7) and the second valve stem (8) are in a relatively clamped state, and the pneumatic actuator (1) drives the first valve stem (7) and the second valve stem (8) to work in coordination.

2. The pneumatic manual spring-loaded locking switching device according to claim 1, characterized in that: The pneumatic actuator (1) comprises a cylinder (101), an elastic portion (102) is provided at the inner top of the cylinder (101), a piston member (103) is provided at the bottom of the elastic portion (102), the circumference of the piston member (103) is connected to the inner wall of the cylinder (101) via a sealing ring (104), and the lower surface of the piston member (103) is connected to the first valve stem (7); The bottom of the cylinder body (101) is provided with an air delivery port (105), and compressed gas is introduced into the cylinder body (101) through the air delivery port (105) to drive the piston member (103) to move upward, and compressed air in the cylinder body (101) is extracted through the air delivery port (105) to drive the piston member (103) to move downward.

3. The pneumatic manual spring-loaded locking switching device according to claim 2, characterized in that: The manual actuator (2) comprises a housing (201), a driven part (202) is provided inside the housing (201), an active part (203) is transmission-connected to the outside of the driven part (202), a hand wheel (204) is provided at the end of the active part (203), and the hand wheel (204) is located outside the housing (201); The second valve stem (8) is located in the middle of the driven part (202); when the connecting member (6) is in a separated state, the driven part (202) rotates to drive the second valve stem (8) to operate independently.

4. The pneumatic manual spring-loaded locking switching device according to claim 3 is characterized in that: A connecting cylinder (3) is provided at the top of the driven part (202), symmetrically distributed limiting blocks (4) are provided at the bottom of the connecting cylinder (3), the docking piece (5) is arranged between two limiting blocks (4), and the docking piece (5) is connected to the limiting blocks (4) in a limiting sliding manner.

5. The pneumatic manual spring-loaded locking switching device according to claim 4, characterized in that: A limiting sliding groove opposite to the connecting member (6) is provided on the inner wall of the connecting cylinder (3), and the connecting member (6) slides up and down along the limiting sliding groove.

6. The pneumatic manual spring-loaded locking switching device according to claim 5, characterized in that: The docking member (5) comprises a docking block (501), the docking block (501) being arranged between two limit blocks (4), the docking block (501) being slidably connected to the limit blocks (4), a pushing member (502) being arranged on the outer side of the docking block (501), and the pushing member (502) being connected to the connecting channel (604).

7. The pneumatic manual spring-loaded locking switching device according to claim 5, characterized in that: The first valve stem (7) and the second valve stem (8) are each provided with a clamping portion (11) at one end opposite to the other end, and the connection block (601) is provided with a clamping portion on one side facing the clamping portion (11); When the two connection blocks (601) are in a closed state, the clamping portion (11) and the clamping portion are in a clamping state, and when the two connection blocks (601) are in a separated state, the clamping portion (11) and the clamping portion are in a non-contact state.

8. The pneumatic manual spring-loaded locking switching device according to claim 1, characterized in that: A pressure-bearing member (12) is provided at one end of the first valve stem (7) opposite to the second valve stem (8), and two ends of the pressure-bearing member (12) are rotatably connected to the first valve stem (7) and the second valve stem (8), respectively; A first valve hole (13) is provided at the top of the pressure-bearing member (12), and a second valve hole (14) is provided at the outer side of the pressure-bearing member (12).

9. The pneumatic manual spring-loaded locking switching device according to claim 8, characterized in that: An air passage (15) is provided on the first valve stem (7), one end of the air passage (15) is connected to the sealing ring (104), and the other end of the air passage (15) is connected to the first valve hole (13).

10. The pneumatic manual spring-loaded locking switching device according to claim 3, characterized in that: A valve core (9) is provided at one end of the second valve stem (8) extending out of the housing (201), an elastic member (10) is provided at the top of the valve core (9), and the elastic member (10) is connected to a regulating valve arranged below the manual actuator (2).

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