CN114658917B - High-pressure actuating mechanism - Google Patents

Abstract

The invention relates to the technical field of actuating mechanisms, and discloses a high-pressure actuating mechanism which comprises a main actuating mechanism, a valve body, a gas pipe, a standby actuating mechanism and a locking mechanism, wherein the main actuating mechanism comprises a first shell and a first actuating piece, an induction plate capable of detecting pressure is arranged on the first shell, the first actuating piece comprises a pressing plate, and when the valve body is closed through the main actuating mechanism, compressed air is introduced into the first shell through the gas pipe. This high pressure actuating mechanism, in time detect out the emergence of unexpected situation when the unable complete closure of valve body leads to liquid to leak through the tablet, and overhaul before notifying the staff through sending out the police dispatch newspaper, simultaneously when first executive is destroyed and can't be normally driven by compressed air because of the gas tightness, the clamp plate can be switched into by the drive of first executive automatically and drive by reserve actuating mechanism, and fix a position the clamp plate through locking mechanical system, make the valve body keep the closure state before accomplishing the maintenance, avoid liquid to continuously flow out and cause the wasting of resources.

Description

High-pressure actuating mechanism

Technical Field

The invention relates to the technical field of actuating mechanisms, in particular to a high-pressure actuating mechanism.

Background

The actuator is a driving device capable of providing linear or rotary motion, and utilizes liquid, gas, electric power or other energy sources to work under the action of a certain control signal to control the opening and closing of the valve. The pneumatic actuator is in a film type, a piston type, a shifting fork type and a gear and rack type. The membrane type pneumatic actuator adopts a membrane as a sealing and moving part, and realizes action by pushing the membrane to move through compressed air.

In the actuating mechanism use, because the diaphragm clamp is reciprocating motion between the upper and lower membrane lid, easy because pull repeatedly or receive too big pressure and take place to break, because the gas tightness is destroyed makes the input atmospheric pressure of applying the diaphragm surface reveal from breaking, can't produce sufficient thrust and remove the promotion push rod, and then be difficult to the accurate valve that closes, just need the staff to repair or change the diaphragm, but the staff probably can't in time discover unexpected situation and maintain, and before the staff arrives the on-the-spot completion maintenance, because the diaphragm breaks, actuating mechanism can't drive the valve closure, the fluid is continuously emitted to the valve, cause very big wasting of resources.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a high-pressure actuating mechanism which has the advantages of timely giving an alarm when a valve body cannot be completely closed, keeping the valve body in a closed state before maintenance is finished and the like, and solves the problems that an accident condition cannot be timely given an alarm and the actuating mechanism cannot drive the valve to close before maintenance is finished in the prior art.

(II) technical scheme

In order to solve the technical problems that the prior art cannot timely alarm an unexpected condition and an actuating mechanism cannot drive a valve to close before maintenance is finished, the invention provides the following technical scheme:

a high-pressure actuating mechanism comprises a main actuating mechanism, a valve body, a gas pipe, a standby actuating mechanism and a locking mechanism, wherein the main actuating mechanism comprises a first shell and a first actuating piece, an induction plate capable of detecting pressure is arranged on the first shell, the first actuating piece comprises a pressing plate, and the pressing plate is always positioned right above the induction plate;

when the valve body is closed through the main actuating mechanism, the gas transmission pipe introduces compressed air into the first shell, the compressed air acts on the first actuating piece and drives the first actuating piece to descend to the lowest position, so that the lower surface of the pressure plate is attached to the upper surface of the induction plate, and the induction plate can detect a certain pressure;

if the first executing part is damaged due to air tightness when receiving the action of compressed air, the valve body is incompletely closed, at the moment, the pressure value detected by the sensing plate is greatly reduced to trigger an alarm, meanwhile, the compressed air is led to the standby executing mechanism by the air conveying pipe, the standby executing mechanism drives the pressing plate to descend to the lowest position, and the locking mechanisms on the two sides of the pressing plate are triggered to pop up to lock the position of the pressing plate.

Preferably, first casing from the top includes casing, lower casing, side extension board and base in proper order, go up the casing with sealed cooperation with the detachable mode down between the casing, the tablet sets up the base upper surface, be provided with pressure sensor and the siren through signal of telecommunication connection on the base, pressure sensor's forced induction face with tablet upper surface parallel and level.

Preferably, the first executing part further comprises a membrane, a membrane supporting plate, a valve rod, a first elastic part and a valve core, the membrane is clamped between the upper shell and the lower shell, the membrane supporting plate is detachably assembled in the middle of the membrane, the bottom end of the membrane supporting plate is fixedly connected with the valve rod, two ends of the first elastic part are respectively connected with the bottom end of the membrane supporting plate and the bottom surface of the inner portion of the lower shell, the valve rod sequentially penetrates through the lower end of the lower shell, the surface of the base and the upper end of the valve body, and the valve core is arranged at the end portion of the valve rod and matched with a valve seat arranged in the valve body in shape with the valve core.

Preferably, the standby executing mechanism comprises a second shell and a second executing part, the second executing part comprises a piston, a push rod, a second elastic part and a connecting rod, the piston is assembled in the second shell in a sliding mode, the push rod is fixedly connected to the lower end of the piston, two ends of the second elastic part are respectively connected with the lower surface of the piston and the bottom surface of the interior of the second shell, the push rod penetrates through the bottom surface of the second shell and is fixedly connected with the connecting rod, and the connecting rod is located above the pressing plate;

the side supporting plate is provided with a support, and the second shell is fixedly installed on the support.

Preferably, the locking mechanism comprises a positioning block and a spring, a guide telescopic rod is arranged at the inner side of the spring, mounting grooves are respectively formed in the inner surfaces of the two side support plates, and two ends of the spring are respectively connected with the inner wall of each mounting groove and the positioning block;

the second executive component further comprises limiting plates, the limiting plates are fixedly connected to the lower sides of the two ends of the connecting rod respectively, the spring is in a force accumulation state when one side surface of each limiting plate is attached to the end portion of the corresponding positioning block, guide holes are formed in the two sides of the surface of the base respectively, and the limiting plates are in sliding fit with the inner walls of the guide holes respectively.

Preferably, positioning grooves are respectively formed in two sides of the pressing plate, positioning holes are respectively formed in the surface of the limiting plate, the positioning grooves and the positioning holes are matched with the cross-sectional shapes of the positioning blocks, and the positioning grooves and the positioning holes are equal in height when the first elastic piece is in a natural extension state.

Preferably, the gas transmission pipe comprises a main pipe, a first branch pipe and a second branch pipe, the input end of the main pipe is connected with a gas source of compressed air, the first branch pipe and the second branch pipe are respectively provided with a first electromagnetic valve and a second electromagnetic valve, and the first electromagnetic valve and the second electromagnetic valve are both connected with the pressure sensor through electric signals;

the upper shell is provided with a first air inlet, the first branch pipe is communicated with the first air inlet, the upper end of the second shell is provided with a second air inlet, and the second branch pipe is communicated with the second air inlet.

Preferably, a scale plate is arranged on the base, a valve rod is arranged on the base, and the valve rod slides along the direction of the scale plate when lifting.

Preferably, the base bottom is provided with first connecting seat, the valve body upper end is provided with the second connecting seat, first connecting seat with in the sealed cooperation of detachable mode between the second connecting seat, the valve rod surface with be provided with the sealing washer between the second connecting seat inner wall.

(III) advantageous effects

Compared with the prior art, the invention provides a high-pressure actuating mechanism which has the following beneficial effects:

1. this high pressure actuating mechanism, in time detect out the emergence of unexpected situation when the unable complete closure of valve body leads to liquid to leak through the tablet, and overhaul before notifying the staff through sending out the police dispatch newspaper, simultaneously when first executive is destroyed and can't be normally driven by compressed air because of the gas tightness, the clamp plate can be switched into by the drive of first executive automatically and drive by reserve actuating mechanism, and fix a position the clamp plate through locking mechanical system, make the valve body keep the closure state before accomplishing the maintenance, avoid liquid to continuously flow out and cause the wasting of resources.

2. This high pressure actuating mechanism, through letting in compressed air inside the casing, compressed air exerts pressure to the diaphragm, and drive diaphragm, diaphragm layer board, valve rod, clamp plate and case descend, and first elastic component is held up power by the compression simultaneously, and when the clamp plate descends to the extreme low position, the case just supports completely on the disk seat, makes the valve body closed completely, and liquid can't flow out.

3. When compressed air is led into the second shell, the compressed air can drive the piston to descend, the push rod and the connecting rod are sequentially driven to descend, the connecting rod drives the pressing plate to descend, and the valve body is completely closed by descending the pressing plate to the lowest position.

4. This high pressure actuating mechanism, it is spacing to the locating piece tip through the limiting plate, makes the spring hold power, and when the clamp plate was descended to the extreme low position by the connecting rod drive, locating piece, constant head tank and locating hole were in same height, and under the elastic action of spring, the locating piece can pop out automatically, and the constant head tank is gone into to the bullet from the locating hole, fixes a position the clamp plate, makes the valve body keep the closure state before accomplishing the maintenance.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a second schematic perspective view of the present invention;

FIG. 3 is an exploded view of the present invention;

FIG. 4 is a schematic view of a partial cross-sectional structure of a backup actuator according to the present invention;

FIG. 5 is a cross-sectional view of the locking mechanism in the stored state of the invention;

fig. 6 is a schematic sectional view of the locking mechanism of the present invention in a locked state.

In the figure: 1. a first housing; 11. an upper housing; 111. a first air inlet; 12. a lower housing; 13. a side support plate; 131. a support; 132. mounting grooves; 14. a base; 141. a pressure sensor; 142. an alarm; 143. a guide hole; 144. a scale plate; 145. a first connecting seat; 2. a first actuator; 21. pressing a plate; 211. a connecting plate; 212. positioning a groove; 22. a membrane; 23. a membrane support plate; 24. a valve stem; indicator 241, indicator; 25. a first elastic member; 26. a valve core; 3. a valve body; 31. a valve seat; 32. a second connecting seat; 33. a seal ring; 4. a gas delivery pipe; 41. a main pipe; 42. a first branch pipe; 421. a first solenoid valve; 43. a second branch pipe; 431. a second solenoid valve; 5. a standby actuator; 51. a second housing; 511. a second air inlet; 52. a second actuator; 521. a piston; 522. a push rod; 523. a second elastic member; 524. a connecting rod; 525. a limiting plate; 5251. positioning holes; 6. a locking mechanism; 61. positioning blocks; 62. a spring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, a high-pressure actuator includes a main actuator, a valve body 3, a gas pipe 4, a standby actuator 5 and a locking mechanism 6, the main actuator includes a first housing 1 and a first actuator 2, the first housing 1 is provided with an induction plate capable of detecting pressure, the first actuator 2 includes a pressure plate 21, and the pressure plate 21 is always located right above the induction plate;

when the valve body 3 is closed through the main actuating mechanism, the air conveying pipe 4 introduces compressed air into the first shell 1, the compressed air acts on the first actuating element 2 and drives the first actuating element 2 to descend to the lowest position, so that the lower surface of the pressure plate 21 is attached to the upper surface of the sensing plate, and the sensing plate can detect a certain pressure;

if the first executing part 2 is damaged due to air tightness when receiving the action of compressed air, so that the valve body 3 is incompletely closed, the pressure value detected by the sensing plate is greatly reduced to trigger an alarm, the sensing plate can timely detect the occurrence of an unexpected situation when the valve body 3 cannot be completely closed to cause liquid leakage, and the alarm is sent to inform a worker to overhaul before, meanwhile, the air pipe 4 leads the compressed air to the standby executing mechanism 5, the standby executing mechanism 5 drives the pressing plate 21 to descend to the lowest position, and the locking mechanisms 6 on the two sides of the pressing plate 21 are triggered to pop up to lock the position of the pressing plate 21, so that when the first executing part 2 cannot be normally driven by the compressed air due to the damaged air tightness, the pressing plate 21 can be automatically driven by the first executing part 2 to be switched to be driven by the standby executing mechanism 5 and positioned by the locking mechanisms 6, the valve body 3 is kept in a closed state before the maintenance is finished, and the problem that the liquid continuously flows out to cause resource waste is avoided.

When the valve is used, compressed air is introduced into the first shell 1 through the air delivery pipe 4 to drive the first executing part 2 to descend to the lowest position, so that the valve body 3 is completely closed, the pressure plate 21 is attached to the induction plate, and the induction plate can detect certain pressure; if the valve body 3 can not be completely closed due to the fact that the air tightness of the first executing part 2 is damaged when the first executing part receives the action of compressed air, the sensing plate can trigger an alarm through the great reduction of the detected pressure value, and a worker is informed to overhaul the valve body in the front; meanwhile, the air pipe 4 leads the compressed air to the standby executing mechanism 5, the standby executing mechanism 5 drives the pressing plate 21 to descend to the lowest position, the locking mechanism 6 is triggered to position the pressing plate 21, the valve body 3 is kept in a closed state before a worker completes a maintenance task, and resource waste caused by continuous outflow of liquid is avoided.

Further, please refer to fig. 1 and 2, the first housing 1 sequentially includes an upper housing 11, a lower housing 12, a side supporting plate 13 and a base 14 from top to bottom, the upper housing 11 is in sealing fit with the lower housing 12 through a first bolt, the sensing plate is disposed on the upper surface of the base 14, the base 14 is provided with a pressure sensor 141 and an alarm 142 connected through an electrical signal, a pressure sensing surface of the pressure sensor 141 is flush with the upper surface of the sensing plate, so that when the first actuator 2 descends to the lowest position, the pressure plate 21 is attached to the sensing plate, the sensing plate can detect the pressure from the pressure plate 21 through the pressure sensor 141, and if the pressure value detected by the pressure sensor 141 is greatly reduced, the alarm 142 is triggered to send an alarm to notify a worker to overhaul.

Further, referring to fig. 5, the first actuator 2 further includes a membrane 22, a membrane supporting plate 23, a valve rod 24, a first elastic member 25 and a valve core 26, the membrane 22 is clamped between the upper housing 11 and the lower housing 12, the membrane supporting plate 23 is detachably mounted in the middle of the membrane 22, the valve rod 24 is fixedly connected to the bottom end of the membrane supporting plate 23, two ends of the first elastic member 25 are respectively connected to the bottom end of the membrane supporting plate 23 and the inner bottom surface of the lower housing 12, the valve rod 24 sequentially penetrates through the lower end of the lower housing 12, the surface of the base 14 and the upper end of the valve body 3, the valve core 26 is disposed at the end of the valve rod 24, and a valve seat 31 formed in the valve body 3 is matched with the valve core 26 in shape, so that when the air pipe 4 introduces compressed air into the upper housing 11, the compressed air presses the membrane 22, the membrane supporting plate 23, the valve rod 24, the pressing plate 21 and the valve core 26 descend, and the first elastic member 25 is compressed, and when the pressing plate 21 descends to the lowest position, the valve core 26 is completely abutted against the valve seat 31, so that the valve body 3 is completely closed and liquid cannot flow out. Specifically, when the first elastic element 25 is in a natural extension state, the upper surface of the membrane supporting plate 23 is attached to the inner top surface of the upper shell 11, and the pressure plate 21 is at the highest position; specifically, the valve core 26 and the valve rod 24 are detachable structures, a thread groove is formed in the valve core 26, a thread column is arranged at the end of the valve rod 24, and the valve core 26 and the valve rod 24 are assembled through threads.

Further, referring to fig. 3 and 4, the standby actuator 5 includes a second housing 51 and a second actuator 52, the second actuator 52 includes a piston 521, a push rod 522, a second elastic member 523 and a connecting rod 524, the piston 521 is slidably mounted inside the second housing 51, the push rod 522 is fixedly connected to the lower end of the piston 521, two ends of the second elastic member 523 are respectively connected to the lower surface of the piston 521 and the bottom surface inside the second housing 51, the push rod 522 passes through the bottom surface of the second housing 51 and is fixedly connected to the connecting rod 524, a connecting plate 211 is disposed on one side of the pressing plate 21, when the second elastic member 523 is in a natural extension state, the upper surface of the piston 521 is attached to the top surface inside the second housing 51, and when the pressing plate 21 is at the highest position, the connecting rod 524 is attached to the connecting plate 211, so that when the air pipe 4 leads compressed air into the second housing 51, the compressed air can drive the piston 521 to descend, and then drive the push rod 522 and the connecting rod 524 to descend in sequence, and the connecting rod 524 drives the pressing plate 21 to descend, and the pressing plate 21 to lower the lowest position to completely close the valve body 3;

the side support plate 13 is provided with a bracket 131, the middle part of the bracket 131 is provided with a fixing sleeve, and the second shell 51 is fixedly arranged on the fixing sleeve. Specifically, the outer wall of the second housing 51 and the inner wall surface of the fixing sleeve may be provided with a threaded protrusion and a threaded groove, respectively, so that the second housing 51 and the fixing sleeve may be fixed together by threaded assembly; the outer wall of the second shell 51 can also be directly welded with the inner wall of the fixed sleeve;

referring to fig. 3, the locking mechanism 6 includes a positioning block 61 and a spring 62, one end of the positioning block 61 is provided with a handle, the inner side of the spring 62 is provided with a guiding telescopic rod, the inner surfaces of the two side support plates 13 are respectively provided with an installation groove 132, and two ends of the spring 62 and the guiding telescopic rod are respectively connected with the inner wall of the installation groove 132 and the positioning block 61;

referring to fig. 4, the second actuator 52 further includes a limiting plate 525, the limiting plates 525 are respectively and fixedly connected to lower sides of two ends of the connecting rod 524, the spring 62 is in a force accumulation state when one side surface of the limiting plate 525 is respectively attached to the end portions of the positioning blocks 61, the two sides of the surface of the base 14 are respectively provided with a guiding hole 143, and the limiting plates 525 are respectively in sliding fit with inner walls of the guiding holes 143.

Referring to fig. 4-6, positioning grooves 212 are respectively formed on two sides of the pressing plate 21, positioning holes 5251 are respectively formed on the surface of the limiting plate 525, the positioning grooves 212 and the positioning holes 5251 are both matched with the cross-sectional shape of the positioning block 61, and the positioning grooves 212 and the positioning holes 5251 are as high as each other when the first elastic member 25 is in a natural extension state, so that the limiting plate 525 can be driven to descend when the connecting rod 524 descends, the positioning block 61, the positioning grooves 212 and the positioning holes 5251 are at the same height when the pressing plate 21 is driven to descend to the lowest position by the connecting rod 524, and the positioning block 61 can automatically pop up under the elastic action of the spring 62, and pop into the positioning groove 212 from the positioning hole 5251 to position the pressing plate 21.

Further, referring to fig. 2, the gas pipe 4 includes a main pipe 41, a first branch pipe 42 and a second branch pipe 43, an input end of the main pipe 41 is connected with a source of compressed air, the first branch pipe 42 and the second branch pipe 43 are respectively provided with a first solenoid valve 421 and a second solenoid valve 431, and both the first solenoid valve 421 and the second solenoid valve 431 are connected with the pressure sensor 141 through electrical signals;

the upper shell 11 is provided with a first air inlet 111, the first branch pipe 42 is communicated with the first air inlet 111, the upper end of the second shell 51 is provided with a second air inlet 511, and the second branch pipe 43 is communicated with the second air inlet 511, so that compressed air is introduced into the upper shell 11 through the main pipe 41 and the first branch pipe 42 by opening the first electromagnetic valve 421 and closing the second electromagnetic valve 431, when the pressure plate 21 descends to be attached to the sensing plate, if the pressure value detected by the pressure sensor 141 is greatly reduced, the first electromagnetic valve 421 is automatically closed and the second electromagnetic valve 431 is automatically opened while the alarm 142 is triggered to give an alarm, compressed air is introduced into the second shell 51 through the main pipe 41 and the second branch pipe 43, the pressure plate 21 is driven to descend by the standby execution mechanism 5, after the pressure plate 21 descends to the lowest position, the positioning block 61 is ejected into the positioning groove 212 from the positioning hole 5251 to position the pressure plate 21, and the second electromagnetic valve 431 is closed, and resources are saved.

Further, referring to fig. 2, a scale plate 144 is disposed on the base 14, an indicating member 241 is disposed on the valve rod 24, and the indicating member 241 slides along the scale plate 144 when the valve rod 24 ascends and descends, so that a worker can observe the ascending and descending condition of the valve core 26 in real time.

Further, referring to fig. 3, a first connecting seat 145 is disposed at the bottom end of the base 14, a second connecting seat 32 is disposed at the upper end of the valve body 3, the first connecting seat 145 and the second connecting seat 32 are in sealing fit via a second bolt, and a sealing ring 33 is disposed between the surface of the valve rod 24 and the inner wall of the second connecting seat 32 for ensuring the air tightness of the valve body 3.

When the valve is used, the first electromagnetic valve 421 is in an open state and the second electromagnetic valve 431 is in a closed state in a normal state, compressed air is introduced into the first shell 1 through the main pipe 41 and the first branch pipe 42, the compressed air applies pressure to the diaphragm 22 to drive the diaphragm 22, the diaphragm supporting plate 23, the valve rod 24, the pressure plate 21 and the valve core 26 to descend, when the pressure plate 21 descends to the lowest position, the valve core 26 just completely abuts against the valve seat 31, the valve body 3 is completely closed, liquid cannot flow out, the pressure plate 21 is attached to the sensing plate, and the sensing plate can detect the pressure from the pressure plate 21 through the pressure sensor 141;

if the pressure value detected by the pressure sensor 141 is greatly reduced, the alarm 142 is triggered to give an alarm to notify a worker of the previous maintenance, meanwhile, the first electromagnetic valve 421 is automatically closed, the second electromagnetic valve 431 is automatically opened, compressed air is introduced into the second housing 51 through the main pipe 41 and the second branch pipe 43, the compressed air can drive the piston 521 to descend, and further drive the push rod 522, the connecting rod 524 and the limiting plate 525 to descend in sequence, the connecting rod 524 drives the pressure plate 21 to descend, and the pressure plate 21 descends to the lowest position to enable the valve core 26 to completely abut against the valve seat 31, so that the valve body 3 is completely closed; at this time, the positioning block 61, the positioning groove 212 and the positioning hole 5251 are at the same height, and under the elastic action of the spring 62, the positioning block 61 can automatically pop up and pop into the positioning groove 212 from the positioning hole 5251 to position the pressure plate 21, so that the valve body 3 is kept in a stable closed state before a worker completes a maintenance task, and the liquid is prevented from continuously flowing out.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. The utility model provides a high pressure actuating mechanism, includes main actuating mechanism, valve body (3), gas-supply pipe (4), reserve actuating mechanism (5) and locking mechanical system (6), its characterized in that: the main actuating mechanism comprises a first shell (1) and a first actuating piece (2), wherein an induction plate capable of detecting pressure is arranged on the first shell (1), the first actuating piece (2) comprises a pressing plate (21), and the pressing plate (21) is always positioned right above the induction plate;

when the valve body (3) is closed through the main actuating mechanism, compressed air is introduced into the first shell (1) through the air conveying pipe (4), acts on the first actuating piece (2) and drives the first actuating piece (2) to descend to the lowest position, so that the lower surface of the pressure plate (21) is attached to the upper surface of the sensing plate, and the sensing plate can detect certain pressure;

if the valve body (3) is incompletely closed due to the fact that air tightness of the first executing part (2) is damaged when the first executing part receives the action of compressed air, the pressure value detected by the sensing plate is greatly reduced to trigger an alarm, meanwhile, the air conveying pipe (4) leads the compressed air to the standby executing mechanism (5), the standby executing mechanism (5) drives the pressing plate (21) to descend to the lowest position, and the locking mechanisms (6) on the two sides of the pressing plate (21) are triggered to pop up to lock the position of the pressing plate (21);

the first shell (1) sequentially comprises an upper shell (11), a lower shell (12), a side supporting plate (13) and a base (14) from top to bottom, the upper shell (11) and the lower shell (12) are in detachable sealing fit, the sensing plate is arranged on the upper surface of the base (14), a pressure sensor (141) and an alarm (142) which are connected through electric signals are arranged on the base (14), and the pressure sensing surface of the pressure sensor (141) is flush with the upper surface of the sensing plate;

the first executing part (2) further comprises a membrane (22), a membrane supporting plate (23), a valve rod (24), a first elastic part (25) and a valve core (26), the membrane (22) is clamped between the upper shell (11) and the lower shell (12), the membrane supporting plate (23) is detachably assembled in the middle of the membrane (22), the valve rod (24) is fixedly connected to the bottom end of the membrane supporting plate (23), two ends of the first elastic part (25) are respectively connected with the bottom end of the membrane supporting plate (23) and the inner bottom surface of the lower shell (12), the valve rod (24) sequentially penetrates through the lower end of the lower shell (12), the surface of the base (14) and the upper end of the valve body (3), and the valve core (26) is arranged at the end part of the valve rod (24) and a valve seat (31) formed in the valve body (3) is matched with the valve core (26) in shape;

the standby actuating mechanism (5) comprises a second shell (51) and a second actuating element (52), the second actuating element (52) comprises a piston (521), a push rod (522), a second elastic element (523) and a connecting rod (524), the piston (521) is assembled in the second shell (51) in a sliding mode, the push rod (522) is fixedly connected to the lower end of the piston (521), two ends of the second elastic element (523) are respectively connected with the lower surface of the piston (521) and the inner bottom surface of the second shell (51), the push rod (522) penetrates through the bottom surface of the second shell (51) and is fixedly connected with the connecting rod (524), and the connecting rod (524) is located above the pressing plate (21);

the side support plate (13) is provided with a bracket (131), and the second shell (51) is fixedly arranged on the bracket (131).

2. A high pressure actuator as claimed in claim 1, wherein: the locking mechanism (6) comprises a positioning block (61) and a spring (62), a guiding telescopic rod is arranged on the inner side of the spring (62), mounting grooves (132) are respectively formed in the inner surfaces of the two side support plates (13), and two ends of the spring (62) are respectively connected with the inner walls of the mounting grooves (132) and the positioning block (61);

second executive component (52) still include limiting plate (525), limiting plate (525) fixed connection respectively in connecting rod (524) both ends downside, a side surface of limiting plate (525) respectively with when locating piece (61) tip pastes spring (62) are in and hold power state, guiding hole (143) have been seted up respectively to base (14) surperficial both sides, limiting plate (525) respectively with guiding hole (143) inner wall sliding fit.

3. A high pressure actuator as claimed in claim 2, wherein: positioning grooves (212) are formed in two sides of the pressing plate (21), positioning holes (5251) are formed in the surface of the limiting plate (525), the positioning grooves (212) and the positioning holes (5251) are matched with the cross-sectional shapes of the positioning blocks (61), and the positioning grooves (212) and the positioning holes (5251) are equal in height when the first elastic piece (25) is in a natural extension state.

4. A high pressure actuator as claimed in claim 3, wherein: the gas conveying pipe (4) comprises a main pipe (41), a first branch pipe (42) and a second branch pipe (43), the input end of the main pipe (41) is connected with a gas source of compressed air, a first electromagnetic valve (421) and a second electromagnetic valve (431) are respectively arranged on the first branch pipe (42) and the second branch pipe (43), and the first electromagnetic valve (421) and the second electromagnetic valve (431) are both connected with the pressure sensor (141) through electric signals;

a first air inlet (111) is formed in the upper shell (11), the first branch pipe (42) is communicated with the first air inlet (111), a second air inlet (511) is formed in the upper end of the second shell (51), and the second branch pipe (43) is communicated with the second air inlet (511).

5. A high pressure actuator as claimed in claim 1, wherein: the base (14) is provided with a scale plate (144), the valve rod (24) is provided with an indicating piece (241), and the indicating piece (241) slides along the scale plate (144) when the valve rod (24) goes up and down.

6. A high pressure actuator as claimed in claim 1, wherein: the valve is characterized in that a first connecting seat (145) is arranged at the bottom end of the base (14), a second connecting seat (32) is arranged at the upper end of the valve body (3), the first connecting seat (145) is in sealing fit with the second connecting seat (32) in a detachable mode, and a sealing ring (33) is arranged between the surface of the valve rod (24) and the inner wall of the second connecting seat (32).

7. A method of operating a high pressure actuator as claimed in claim 4, characterized by: under a normal state, the first electromagnetic valve (421) is in an open state, the second electromagnetic valve (431) is in a closed state, compressed air is introduced into the first shell (1) through the main pipe (41) and the first branch pipe (42), the compressed air presses the diaphragm (22), the diaphragm supporting plate (23), the valve rod (24), the pressure plate (21) and the valve core (26) are driven to descend, when the pressure plate (21) descends to the lowest position, the valve core (26) is just completely abutted to the valve seat (31), the valve body (3) is completely closed, liquid cannot flow out, the pressure plate (21) is attached to the sensing plate at the moment, and the sensing plate can detect the pressure from the pressure plate (21) through the pressure sensor (141);

if the pressure value detected by the pressure sensor (141) is greatly reduced, an alarm (142) is triggered to give an alarm to notify a worker of the previous maintenance, meanwhile, the first electromagnetic valve (421) is automatically closed, the second electromagnetic valve (431) is automatically opened, compressed air is introduced into the second shell (51) through the main pipe (41) and the second branch pipe (43), the compressed air can drive the piston (521) to descend, and further drive the push rod (522), the connecting rod (524) and the limiting plate (525) to descend in sequence, the connecting rod (524) drives the pressure plate (21) to descend, the valve core (26) is completely abutted against the valve seat (31) by descending the pressure plate (21) to the lowest position, and the valve body (3) is completely closed; at the moment, the positioning block (61), the positioning groove (212) and the positioning hole (5251) are located at the same height, the positioning block (61) can be automatically popped out under the elastic action of the spring (62), the positioning groove (212) is popped in from the positioning hole (5251), the pressing plate (21) is positioned, and then the valve body (3) is kept in a stable closed state before a worker completes a maintenance task, so that liquid is prevented from continuously flowing out.

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