CN107842642B - High-efficiency cut-off type single-action pneumatic actuating mechanism - Google Patents
High-efficiency cut-off type single-action pneumatic actuating mechanism Download PDFInfo
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- CN107842642B CN107842642B CN201711319414.0A CN201711319414A CN107842642B CN 107842642 B CN107842642 B CN 107842642B CN 201711319414 A CN201711319414 A CN 201711319414A CN 107842642 B CN107842642 B CN 107842642B
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- 210000004907 gland Anatomy 0.000 claims abstract description 19
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
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Abstract
The high-efficiency cut-off type single-action pneumatic actuating mechanism comprises a cylinder module, a spring cylinder module, a pneumatic control module and a hydraulic cylinder module, wherein the cylinder module comprises a cylinder, a bracket, a push rod, a guide mechanism and a buffer mechanism; the spring cylinder module comprises a spring cylinder, a baffle ring gland, a spring baffle ring, a spring seat, an inner spring, an outer spring and a spring end cover, the bottom surface of the spring cylinder is fixedly connected with an upper cylinder cover of the cylinder module, and the upper end of the push rod penetrates through a central hole of the bottom surface of the spring cylinder and stretches into the spring cylinder; the hydraulic cylinder module comprises a hydraulic cylinder, an oil pressure pipeline, a hydraulic oil pump and a hydraulic manual stop valve, wherein the hydraulic cylinder is fixedly arranged on a spring end cover of the spring cylinder module, and a hydraulic rod of the hydraulic cylinder extends into the spring cylinder, so that the hydraulic cylinder module has the beneficial effects that: the switch action is stable and smooth; the buffer structure can protect the sealing surface of the valve; the hydraulic cylinder module has small volume the weight is light; the spring cylinder module is convenient to install, convenient to maintain and replace, safe to use and maintain, and capable of avoiding rust spots of the spring from falling into the cylinder; long service life.
Description
Technical Field
The invention belongs to the technical field of valve control, and relates to a driving mechanism for valve opening and closing actions, in particular to a single-acting pneumatic actuating mechanism of a straight travel cut-off valve.
Background
The thrust characteristic curve of the gate valve is characterized in that: the required thrust is very large in the range of 0-5% valve opening, while the required thrust is relatively small in the range of 5% -100% opening, even less than 10% of the closing point thrust. The single-acting pneumatic actuating mechanism of the traditional opening and closing gate valve comprises a cylinder part and a hand wheel mechanism, a single spring is arranged in the cylinder, a piston of the cylinder moves up and down along the inner wall of a cylinder body, and the hand wheel mechanism is mechanical. The characteristics of a traditional single-acting pneumatic actuator are: as the valve opening increases, the compression of the actuator spring increases, and the spring force is maximized when the valve opening reaches 100%. The traditional single-acting pneumatic actuator has the following defects: in order to maximize the compression of the spring (i.e., full valve opening), the area of the cylinder piston has to be made larger, resulting in a large product volume; when the spring is in the cylinder and the service time is long, rust corrosion of the spring can occur, rust easily falls into the cylinder, and when the piston moves up and down, the rust can abrade the cylinder wall, so that the service life of the cylinder is reduced; the piston of the air cylinder is not provided with a guide mechanism, and when the piston deflects, the service life of the air cylinder can be reduced; the mechanical hand wheel mechanism cannot be realized when high thrust is required; when the opening of the valve is 0-5%, the push rod does not buffer, and the sealing surface of the valve is not protected.
Disclosure of Invention
The invention aims to provide a cut-off type single-acting pneumatic actuator matched with a thrust characteristic curve of a gate valve, the output efficiency of the actuating mechanism is improved, the volume of the actuating mechanism is reduced, and the opening and closing time of the actuating mechanism is shortened.
The technical scheme of the invention is as follows: the utility model provides a high-efficiency cut-off type single-action pneumatic actuator, including the cylinder module, spring cylinder module and pneumatic control module, the cylinder module includes the cylinder, support and push rod, the cylinder includes the piston, the cylinder, go up the cylinder cap, lower cylinder cap, the support is fixed on the lower cylinder cap of cylinder module, the piston centre bore is passed to the push rod lower extreme, the middle part and the piston fixed connection of push rod, the push rod lower extreme passes in lower cylinder cap centre bore stretches into the support, the upper end stretches out the upper cylinder cap through last cylinder cap centre bore, the position department that is located the upper cylinder cap in push rod middle part is fixed with the circlip for the axle, the push rod lower extreme is equipped with controlled valve rod adapter sleeve and controlled valve rod coupling nut, be equipped with the pointer on the controlled valve rod coupling nut, the support correspond the department with the pointer and be equipped with the scale, push rod upper end is equipped with hydraulic stem adapter sleeve and hydraulic stem coupling nut, its characterized in that: the high-efficiency cut-off type single-action pneumatic actuating mechanism further comprises a hydraulic cylinder module, the cylinder module further comprises a guide mechanism and a buffer mechanism, two guide holes are symmetrically formed in two sides of a center hole of a piston of the cylinder module, a circle of grooves are formed in the outer circumference of the piston, and a circle of grooves are formed in the inner circumference of the guide hole of the piston; cylindrical holes are formed in the positions, corresponding to the two guide holes on the piston, of the lower cylinder cover of the cylinder module, and two round holes are formed in the positions, corresponding to the two guide holes on the piston, of the upper cylinder cover; the guide mechanism comprises guide rods and guide belts, the two guide rods are matched with two symmetrical guide holes on the piston, the lower ends of the two guide rods respectively penetrate through the two guide holes on the piston and are fixed in the cylindrical hole of the lower cylinder cover, and the upper ends of the two guide rods respectively penetrate through two round holes on the upper cylinder cover and are fixed on the upper cylinder cover; the guide belt comprises an outer guide belt and an inner guide belt, the outer guide belt is a soft belt arranged in a groove on the outer circumference of the piston, and the inner guide belt is a soft belt arranged in a groove on the inner circumference of the piston guide hole; the buffer mechanism comprises a buffer block and a fixed ring, wherein the buffer block is a round sleeve, the buffer block is sleeved on the push rod and is fixed below a central hole of the piston, the fixed ring is fixedly arranged at the lower edge of the buffer block of the push rod, the central hole of a lower cylinder cover of the cylinder module is a stepped hole, a first-order hole is arranged near the lower surface of the lower cylinder cover, a shaft sleeve matched with the first-order hole is arranged in the first-order hole, a second-order hole is arranged near the upper surface of the lower cylinder cover, and the second-order hole is matched with the buffer block;
the spring cylinder module comprises a spring cylinder, a baffle ring gland, a spring baffle ring, a spring seat, an inner spring, an outer spring and a spring end cover, wherein the spring cylinder is a barrel-shaped cylinder, a central hole is arranged at the center of the bottom surface of the spring cylinder, the central hole of the spring cylinder is matched with the outer diameter of a circlip for a shaft in the middle of a push rod, a circular ring groove is arranged at the bottom of the inner wall of the spring cylinder, the baffle ring gland is a cover matched with the inner diameter of the spring cylinder, a central hole is arranged at the center of the baffle ring gland, the central hole of the baffle ring gland is matched with the outer diameter of the circlip for the shaft in the middle of the push rod, the central hole of the spring seat is matched with the outer diameter of the push rod, the spring baffle ring is a circular ring, the outer edge part of the spring baffle ring is arranged in a circular groove at the bottom of the spring cylinder, the inner edge part of the spring baffle ring protrudes out of the inner wall of the spring cylinder, the spring seat is a barrel-shaped seat, the outer diameter of the spring seat is matched with the inner diameter of the spring cylinder, the baffle ring gland, the spring baffle ring and the spring seat are sequentially arranged at the bottom of the spring cylinder, the inner spring is sleeved in the outer spring, the inner spring and the outer spring are arranged on the spring seat in the spring cylinder, the center of the spring end cover is provided with a center hole, the spring end cover is fixed on the upper opening of the spring cylinder, the inner spring and the outer spring are tightly pressed, the bottom surface of the spring cylinder is fixedly connected with the upper cylinder cover of the cylinder module, and the upper end of the push rod of the cylinder module penetrates through the center hole at the bottom surface of the spring cylinder and stretches into the spring cylinder;
the hydraulic cylinder module comprises a hydraulic cylinder, an oil pressure pipeline, a hydraulic oil pump and a hydraulic manual stop valve, wherein an inlet and an outlet of the hydraulic oil pump are respectively connected to end interfaces of an upper cavity and a lower cavity of the hydraulic cylinder through the oil pressure pipeline, the inlet and the outlet of the hydraulic manual stop valve are respectively connected to end interfaces of the upper cavity and the lower cavity of the hydraulic cylinder through the oil pressure pipeline, the hydraulic cylinder is fixedly arranged on a spring end cover of the spring cylinder module, a hydraulic rod of the hydraulic cylinder extends into the spring cylinder and is fixedly connected with the upper end of a push rod, and the hydraulic oil pump is connected with a hydraulic oil source;
the air control module is an air control system of the air cylinder module, the air control module comprises a mechanically controlled two-position three-way valve, a normally-closed two-position three-way air control valve, an air control reversing valve, a normally-closed two-position two-way air control valve I, a quick exhaust valve, a pressure gauge I, a filtering reducing valve, a compressed air source, a two-position three-way electromagnetic valve, a plug I, a normally-closed two-position two-way air control valve II, a normally-open two-way air control valve, a plug II, a pressure gauge II, an air control manual stop valve and a controller, wherein the compressed air source is communicated with the lower piston cavity of the air cylinder module through a pipeline, the pipeline which is communicated with the lower piston cavity of the air cylinder module through the compressed air source is sequentially connected with the filtering reducing valve, the pressure gauge I, the quick exhaust valve and the normally-closed two-position two-way air control valve I, the pipeline which is communicated with the lower piston cavity of the air cylinder module is connected with a branch pipeline, the branch pipeline is communicated with the upper piston cavity of the air cylinder module, the air control manual stop valve and the pressure gauge II are arranged on the branch pipeline, the two-position three-way valves are connected with the two-way valves in series with the two-way control valves, the two-position three-way valve control valve is communicated with the two normally-position three-way valve control valve ends of the air control valve and the air valve are communicated with the normally-closed by the two-position three-way valve control valve, and the two-way valve control valve end of the air control valve is communicated with the air valve is connected with the normally-closed by the valve control valve end of the valve and the valve. The control end of the normally open type two-position two-way ventilation control valve is communicated with a third interface of the pneumatic control reversing valve, the control end of the normally closed type two-position two-way ventilation control valve I is communicated with one interface of the two-position three-way electromagnetic valve, the other interface of the two-position three-way electromagnetic valve is communicated with a pipe section between the pressure gauge I and the quick exhaust valve, the control end of the two-position three-way electromagnetic valve is connected with the controller, the mechanically controlled two-position three-way valve is arranged at the contact position of the outer edge of a valve rod connecting nut of the controlled valve at the lower end of a push rod of the cylinder module, and the position of the valve rod connecting nut of the controlled valve is located when the controlled valve is at 8% of opening, and the compressed air source is on the site of the controlled valve.
The invention relates to a high-efficiency cut-off type single-action pneumatic actuating mechanism, which is characterized in that: the hydraulic rod is fixedly connected with the push rod through a hydraulic rod connecting nut.
The invention relates to a high-efficiency cut-off type single-action pneumatic actuating mechanism, which is characterized in that: the guide belt is a rubber belt or an engineering plastic belt.
The invention relates to an operation method of a high-efficiency cut-off type single-action pneumatic actuator, which comprises the steps of opening a controlled valve and closing the controlled valve, and is characterized in that: the controlled valve opening method comprises the following steps: opening a hydraulic manual stop valve of a hydraulic cylinder module, starting a hydraulic oil pump, manually closing a pneumatic control manual stop valve, manually opening a compressed air source, controlling a two-position three-way electromagnetic valve to be powered on by a controller, enabling compressed air to enter a lower piston cavity of the cylinder module, discharging compressed air in an upper piston cavity of the cylinder module, enabling the piston to move upwards, enabling a push rod to drive a valve rod of a controlled valve to move upwards, compressing a spring of the spring cylinder module, and opening the valve; the controlled valve closure includes two processes:
the process of closing the controlled valve from 100% to 8% and the process of closing the controlled valve from 8% to full close are as follows: the state of the hydraulic cylinder module is kept, the pneumatic control manual stop valve is manually closed, the controller controls the two-position three-way electromagnetic valve to be powered off, the upper cavity and the lower cavity of the piston of the cylinder module are communicated, the piston moves downwards under the action of spring force, the push rod drives the valve rod of the controlled valve to move downwards until the mechanical control two-position three-way valve is contacted with the outer edge of the valve rod connecting nut of the controlled valve at the lower end of the push rod, and the controlled valve is closed to 8 percent of opening; the process from 8% opening closing to full closing of the controlled valve is as follows: the state of the hydraulic cylinder module is kept, the manual stop valve is kept to be closed, the two-position three-way electromagnetic valve is kept in a power-off state, and after the outer edge of a controlled valve rod connecting nut at the lower end of the push rod is touched by the mechanical control two-position three-way valve, the piston moves downwards under the combined action of spring force and cylinder force until the valve is completely closed.
The principle of the invention is as follows: the valve opening process starts a hydraulic oil pump of a hydraulic cylinder module, oil is supplied to an upper cavity and a lower cavity of the hydraulic cylinder, a hydraulic manual stop valve of the hydraulic cylinder module is opened, the upper cavity and the lower cavity of the hydraulic cylinder are communicated, so that the oil pressure of the upper cavity and the oil pressure of the lower cavity of the hydraulic cylinder are balanced, a two-position three-way electromagnetic valve is electrified, a control end of the normally-closed two-position three-way air control valve is free of air, the normally-closed two-way air control valve is in a normally-closed position, compressed air of a compressed air source is divided into two paths after passing through a filtering relief valve and a pressure gauge I, one path of air enters a pipeline of the normally-closed two-position two-way air control valve I through a quick exhaust valve, the other path of air enters a three-way electromagnetic valve, compressed air passing through the two-way three-way electromagnetic valve is divided into three paths, the first path of air enters a control end of the normally-closed two-position two-way air control valve I, so that the normally-closed two-position two-way air control valve I is in a main path of the piston lower cavity of the cylinder module, the second path enters a control end of the normally-closed two-position two-way air control valve II, the normally-closed two-position two-way air control valve II is in a normally-closed position, the piston is in the normally-closed two-position, the piston air control valve is out, the piston is in the normally-closed two-closed air control valve, and the piston is in the normally-closed air control valve, and the upper cavity of the normally-open air valve moves upwards, and the valve is in the two-position valve and moves upwards, and the valve and is in the normally-position valve and is opened; in the valve opening process, the push rod moves upwards, the machine control two-position three-way valve starts to move through two stages of touching and separating from touching with a valve rod connecting nut at the lower end of the push rod, the valve rod connecting nut at the lower end of the push rod is in a touching state with the machine control two-position three-way valve, after the valve rod connecting nut at the lower end of the push rod moves to a touching point of the machine control two-position three-way valve, the machine control two-position three-way valve is in a non-touching state, the two-position three-way electromagnetic valve is in a power-on state, and the machine control two-position three-way valve is in a touching state or a non-touching state and has no influence on the operation of a control gas circuit;
the valve is closed from 100% opening to 8% opening, the state of the hydraulic cylinder module is unchanged, the controller controls the two-position three-way electromagnetic valve to lose electricity, the mechanical control two-position three-way valve is free from mechanical touch, in an exhaust state, the pneumatic control manual stop valve is closed, the quick exhaust valve is in a one-way passage, the control end of the normally-closed two-position three-way pneumatic control valve is free from air, in a normally-closed position, compressed air of the compressed air source is divided into two passages after passing through the filtering pressure reducing valve and the pressure gauge I, one passage of air enters the main passage of the normally-closed two-position two-way pneumatic control valve I through the quick exhaust valve, the other passage of air enters the two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve in a power-losing state is exhausted, the main passage of the normally-closed two-position two-way pneumatic control valve I is not opened, the control end of the normally-closed two-position two-way pneumatic control valve II is free from air, the normally-closed two-position two-way pneumatic control valve II is in a normally-closed position, the control end of the pneumatic control reversing valve and the main path are exhausted through the electromagnetic valve, the reversing of main path compressed gas enables the control ends of the mechanical control two-position three-way valve and the normally-open two-position two-way pneumatic control valve to be conducted, the mechanical control two-position three-way valve is in an exhaust position, the control ends of the normally-open two-position two-way pneumatic control valve are not air, the normally-open two-position two-way pneumatic control valve is in a normally-open position, the upper cavity and the lower cavity of a piston of the cylinder module are conducted, the piston moves downwards under the action of a spring force, the push rod drives the valve rod to move downwards, the valve is in a closed state, the mechanical control two-position three-way valve is mechanically touched, the compressed air of the upper cavity and the lower cavity of the piston of the cylinder module reaches an equilibrium state, the air pressure is equal, and the valve is closed to 8% opening;
the valve is closed from 8% opening to full closing, the state of the hydraulic cylinder module is unchanged, the two-position three-way electromagnetic valve is kept in power failure, the mechanical control two-position three-way valve mechanically touches the outer edge of a valve rod connecting nut at the lower end of the push rod, the valve rod is in a conducting state, the pneumatic control manual stop valve is closed, the quick exhaust valve is in a one-way passage, the control end of the normally-closed two-position three-way pneumatic control valve is communicated with the upper cavity of the cylinder, the normally-closed two-position three-way pneumatic control valve is in an open exhaust state, the lower cavity of the piston of the cylinder module is exhausted, compressed air of the compressed air source is divided into two paths after passing through the filtering pressure reducing valve and the pressure gauge I, and one path of air enters into a main path of the normally-closed two-position two-way pneumatic control valve I through the quick exhaust valve; the other path of air enters the two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is exhausted when the power is lost, so that the main path of the normally-closed two-position two-way air control valve I is not communicated, the control end of the normally-closed two-position two-way air control valve II is not air, the normally-closed two-way air control valve II is in a normally-closed position, the upper cavity of the piston of the cylinder module cannot exhaust, the control end of the air control reversing valve and the main path are exhausted through the two-position three-way electromagnetic valve, the main path is reversed, the control ends of the machine control two-position three-way valve and the normally-open two-way air control valve are communicated, the control end of the normally-open two-position two-way air control valve is communicated with the upper cavity of the piston of the cylinder module, and the piston moves downwards under the combined action of spring force and air source force until the valve is completely closed.
The beneficial effects of the invention are as follows:
1. the double-guide-rod guide structure has better guide performance, ensures coaxiality, can effectively reduce friction between the piston and the inner wall of the cylinder barrel, ensures more stable and smooth switching action, and prolongs the service life of the actuator.
2. The guide belt is of a soft guide structure, the friction resistance is small, the guide performance is better, the switching action is more stable and smooth, and the service life of the actuator is prolonged.
3. The small opening buffer structure can ensure that the normal valve is opened and closed rapidly, and can slowly close the valve when the valve is opened at a small opening, so that the sealing surface of the valve is better protected, and the service life of the valve is prolonged.
4. The hydraulic cylinder module has the characteristics of long stroke and large thrust, is small in size, light in weight, time-saving and labor-saving, can realize manual and automatic quick switching, and has a self-locking function.
5. The spring cylinder module is of an integrated structure, is convenient to install, is convenient to maintain and replace on line, saves maintenance cost and time, has a spring anti-falling design, and can prevent the spring from being ejected out to hurt people in the installation process.
6. Spring cylinder and cylinder in the form of independent structures of each other, the rust spots of the springs are prevented from falling into the air cylinder, and the service life of the air cylinder is prolonged.
7. The spring adopts a double-spring structure, so that the closing action is more stable and smooth.
8. The design of the pneumatic control module enables the switching point of the air circuit to reach the optimal characteristic curve, improves the output efficiency of the actuating mechanism, and realizes the effect of small volume and large thrust by controlling the mutual conversion of two logic strokes of the actuating mechanism through the mechanical control valve.
Drawings
FIG. 1 is a schematic structural diagram of a high-efficiency cut-off type single-action pneumatic actuator
FIG. 2 is a schematic diagram of the hydraulic cylinder structure of the high-efficiency cut-off type single-action pneumatic actuator
FIG. 3 is a schematic diagram of the spring cylinder structure of the high-efficiency cut-off type single-acting pneumatic actuator
FIG. 4 is a schematic diagram of a hydraulic circuit of a hydraulic hand wheel of a high-efficiency cut-off type single-action pneumatic actuator
FIG. 5 is a schematic diagram of pneumatic control of the structure of the high-efficiency cut-off type single-action pneumatic actuator
FIG. 6 is a schematic diagram showing the working state of the opening section of the pneumatic control valve of the high-efficiency cut-off type single-action pneumatic actuator structure
FIG. 7 is a schematic diagram of the working state of the pneumatic control valve in 100% -8% section of the high-efficiency cut-off type single-action pneumatic actuator structure
FIG. 8 is a schematic diagram of the pneumatic control valve with high efficiency cut-off type single-action pneumatic actuator structure in 8% -0 section of working state
FIG. 9 is an enlarged schematic view of a portion of the bottom of a spring cylinder module of a high efficiency cut-off single-acting pneumatic actuator configuration
FIG. 10 is an enlarged schematic view of a buffer block of a cylinder module of a high-efficiency cut-off type single-acting pneumatic actuator structure
FIG. 11 is a schematic diagram of a prior art pneumatic actuator
In the figure, 1, a bracket, 2, a valve rod connecting sleeve, 3, a valve rod connecting nut, 4, a push rod, 5, a shaft sleeve, 6, a fixing ring, 7, a buffer block, 8, a lower cylinder cover, 9, a piston, 10, a guide rod, 11, a snap ring gland, 12, a limiting piece, 13, a cylinder barrel, 14, an upper cylinder cover, 15, a nut, 16, a circlip for a shaft, 17, an O-ring I, 18, an O-ring II, 19, an O-ring III, 20, an O-ring IV, 21, an O-ring V, 22, an O-ring VI, 23, an inner guide belt, 24, an outer guide belt, 25, an inner hexagon screw, 26, an inner hexagon screw, 27, an outer hexagon screw, 28, a spring washer, 29, a set screw, 30, a pointer, 31, a fine tooth nut, 32, a spring cylinder, 33, a retainer ring gland, 34, a spring retainer ring, 35, a spring seat 36, an inner spring, 37, an outer spring, 38, a spring end cover, 39, an O-ring VII, 40, a wire retainer ring, 41, outer hexagonal bolts, 42, spring washers, 43, hydraulic cylinders, 44, outer hexagonal bolts, 45, spring washers, 46, oil pressure pipelines, 47, hydraulic oil pumps, 48, hydraulic manual stop valves, 49, pneumatic cylinders of pneumatic control modules, 50, mechanical control two-position three-way valves, 51, normally closed two-position three-way pneumatic control valves, 52, pneumatic control reversing valves, 53, normally closed two-position two-way pneumatic control valves I, 54, quick exhaust valves, 55, pressure gauges I, 56, filtration pressure reducing valves, 57, compressed air sources, 58, two-position three-way electromagnetic valves, 59, plugs I, 60, normally closed two-position two-way pneumatic control valves II, 61, normally open two-position two-way pneumatic control valves, 62, plugs II, 63, pressure gauges II, 64, pneumatic control manual stop valves, 65, controllers, 66, hydraulic cylinders, 67, hydraulic rod connecting nuts, 68, hydraulic connecting sleeves, 69, scales 70, mechanical hand wheels, 71. prior art spring barrels, 72, prior art springs.
Detailed Description
The invention is further described below with reference to the drawings and examples.
The high-efficiency cut-off type single-acting pneumatic actuating mechanism comprises a cylinder module, a spring cylinder module, a pneumatic control module and a hydraulic cylinder module, wherein the cylinder module comprises a cylinder, a bracket 1 and a push rod 4, the cylinder comprises a piston 9, a cylinder barrel 13, an upper cylinder cover 14 and a lower cylinder cover 8, the bracket is fixed on the lower cylinder cover 8 of the cylinder module, the lower end of the push rod 4 passes through a central hole of the piston 9, the middle part of the push rod 4 is fixedly connected with the piston 9, an O-shaped ring VI 22 is arranged between the push rod 4 and the piston 9, the lower end of the push rod 4 passes through the central hole of the lower cylinder cover 8 and stretches into the bracket 1, the upper end of the push rod 4 passes through a shaft sleeve in the central hole of the upper cylinder cover 14 and stretches out of the upper cylinder cover 14, a sealing ring O-shaped ring I17 and an O-shaped ring III 19 are arranged between the shaft sleeve and the central hole of the upper cylinder cover 14, a sealing ring O-shaped ring II 18 is arranged between the shaft sleeve and the push rod 4, a valve rod connecting sleeve 2 and a valve rod connecting nut 3 are arranged at the lower end of the push rod 4, a pointer is arranged on the valve rod connecting nut 3, a scale 69 is arranged at the position corresponding to the pointer on the piston 9, a position of the bracket 1 and a guide ring 67 is provided with a guide ring 67, a guide ring 9 is arranged on the circumference of the piston 9, and a guide mechanism is also arranged on the cylinder and is provided with a circumference of a groove on the circumference of the cylinder 9; cylindrical holes are formed in positions, corresponding to the two guide holes in the piston 9, on the lower cylinder cover 8 of the cylinder module, and two round holes are formed in positions, corresponding to the two guide holes in the piston 9, on the upper cylinder cover 14; the guide mechanism comprises guide rods and guide belts, the two guide rods 10 are matched with two symmetrical guide holes on the piston 9, the lower ends of the two guide rods 10 respectively penetrate through the two guide holes on the piston 9 and are fixed in the cylindrical holes of the lower cylinder cover 8, the upper ends of the two guide rods respectively penetrate through two round holes on the upper cylinder cover 14 and are fixed on the upper cylinder cover 14, and a sealing ring O-shaped ring V21 is arranged between the guide rods 10 and the cylindrical holes on the upper cylinder cover 14; the guide belt comprises an outer guide belt 24 and an inner guide belt 23, the outer guide belt 24 being
The soft belt is arranged in the groove on the outer circumference of the piston 9, the inner guide belt 23 is arranged in the groove on the inner circumference of the guide hole of the piston 9, and the guide belt is a rubber belt or an engineering plastic belt; the buffer mechanism comprises a buffer block 7 and a fixed ring 6, wherein the buffer block 7 is a round sleeve, the buffer block 7 is sleeved on the push rod 4 and is fixed below a central hole of a piston, the fixed ring 6 is fixedly arranged at the lower edge of the buffer block 7 of the push rod 4, the central hole of a lower cylinder cover 8 of the cylinder module is a stepped hole, a first-order hole is arranged near the lower surface of the lower cylinder cover 8, a shaft sleeve 5 matched with the first-order hole is arranged in the first-order hole, a second-order hole is arranged near the upper surface of the lower cylinder cover 8, and the second-order hole is matched with the buffer block 7;
the spring cylinder module comprises a spring cylinder 32, a baffle ring gland 33, a spring baffle ring 34, a spring seat 35, an inner spring 36, an outer spring 37 and a spring end cover 38, wherein the spring cylinder 32 is a barrel-shaped cylinder, a central hole is formed in the center of the bottom surface of the spring cylinder 32, the central hole of the spring cylinder 32 is matched with the outer diameter of a shaft elastic retainer ring 16 in the middle of a push rod 4, a circular ring groove is formed in the bottom of the inner wall of the spring cylinder 32, the baffle ring gland 33 is a cover matched with the inner diameter of the spring cylinder 32, a central hole is formed in the center of the baffle ring gland 33, the central hole of the baffle ring gland 33 is matched with the outer diameter of the shaft elastic retainer ring 16 in the middle of the push rod 4, the spring baffle ring 34 is matched with the outer diameter of the shaft elastic retainer ring 16 in the middle of the spring cylinder 32, the spring baffle ring 34 is a circular ring, the outer edge part of the spring baffle ring 34 protrudes out of the inner wall of the spring cylinder 32, the spring seat 35 is a barrel-shaped seat, the outer diameter of the spring seat 35 is matched with the inner diameter of the spring cylinder 32, a central hole is formed in the center of the spring seat 35, the central hole is matched with the outer diameter of the push rod 4, the baffle ring gland 33, the spring baffle ring 34 and the spring seat 35 are sequentially mounted at the bottom of the spring cylinder 32, the inner ring 36 is sleeved in the inner hole, the inner hole of the spring baffle ring 33 and the inner ring 37 is sleeved with the outer diameter of the inner diameter of the elastic retainer ring 16, the spring ring 33, the central hole 37 is sleeved with the outer ring 35, the central hole of the central ring 35 is pressed by the central ring 32, the central hole of the central cylinder is pressed by the central cylinder 32, the central hole and the central cylinder is pressed by the central cylinder and the central cylinder, the central cylinder and the central cylinder of the central cylinder and the central cylinder, the central cylinder and the central cylinder;
the hydraulic cylinder module comprises a hydraulic cylinder 43, an oil pressure pipeline 46, a hydraulic oil pump 47 and a hydraulic manual stop valve 48, wherein the inlet and outlet of the hydraulic oil pump 47 are respectively connected with the end interfaces of the upper cavity and the lower cavity of the hydraulic cylinder 43 through the oil pressure pipeline 46, the inlet and outlet of the hydraulic manual stop valve 48 are respectively connected with the end interfaces of the upper cavity and the lower cavity of the hydraulic cylinder 43 through the oil pressure pipeline 46, the hydraulic cylinder 43 is fixedly arranged on the spring end cover 38 of the spring cylinder module, a hydraulic rod of the hydraulic cylinder 43 extends into the spring cylinder 32, the hydraulic rod is fixedly connected with the upper end of the push rod (4) through a hydraulic rod connecting nut, and the hydraulic oil pump 47 is connected with a hydraulic oil source;
the pneumatic control module is a pneumatic control system of the air cylinder module, the pneumatic control module comprises a mechanical control two-position three-way valve 50, a normally-closed two-position three-way pneumatic control valve 51, a pneumatic control reversing valve 52, a normally-closed two-position two-way pneumatic control valve I53, a quick exhaust valve 54, a pressure gauge I55, a filtering pressure reducing valve 56, a compressed air source 57, a two-position three-way electromagnetic valve 58, a plug I59, a normally-closed two-position two-way pneumatic control valve II 60, a normally-open two-position two-way pneumatic control valve 61, a plug II 62, a pressure gauge II 63, a pneumatic control manual stop valve 64 and a controller 65, the compressed air source 57 is communicated with a piston lower cavity of the air cylinder module through a pipeline, the pipeline of the compressed air source 57 communicated with the piston 9 lower cavity of the air cylinder module is sequentially connected with the filtering pressure reducing valve 56, the pressure gauge I55, the quick exhaust valve 54 and the normally-closed two-position two-way pneumatic control valve I53 in series, the pipeline of the compressed air source 57 communicated with the piston lower cavity of the air cylinder module is connected with a branch pipeline in parallel, the branch pipeline is communicated with the upper cavity of the piston of the cylinder module, the branch pipeline is connected with a pneumatic control manual stop valve 64 and a pressure gauge II 63 in series, a pipe section between the pneumatic control manual stop valve 64 and the pressure gauge II 63 is connected with a manual stop valve pipeline in parallel, the manual stop valve pipeline is blocked by a plug II 62, a pipe section between the pneumatic control manual stop valve 64 and the pressure gauge II 63 is also connected with a control valve loop in parallel, the control valve loop is divided into two paths, the first path is communicated with a normally-closed two-position two-way pneumatic control valve II 60, the control end of the normally-closed two-position two-way pneumatic control valve II 60 is communicated with one interface of the pneumatic control reversing valve 52, and simultaneously communicated with the control end of the pneumatic control reversing valve 52, the second path of the control valve loop is communicated with a normally-open two-position two-way pneumatic control valve 61, the other interface of the normally-closed two-position two-way pneumatic control valve 61 is communicated with the normally-closed two-position three-way pneumatic control valve 51, the control end of the normally-closed two-position three-way pneumatic control valve 51 is communicated with the second interface of the pneumatic control reversing valve 52, the control end of the normally-open two-position two-way pneumatic control valve 61 is communicated with the third interface of the pneumatic control reversing valve 52, the control end of the normally-closed two-position two-way pneumatic control valve I53 is communicated with one interface of the two-position three-way electromagnetic valve 58, the other interface of the two-position three-way electromagnetic valve 58 is communicated with a pipe section between the pressure gauge I55 and the quick exhaust valve 54, the control end of the two-position three-way electromagnetic valve 58 is connected with the controller 65, the mechanically-controlled two-position three-way valve 50 is arranged at the contact position of the outer edge of the valve rod connecting nut 3 at the lower end of the cylinder module push rod 4 and is positioned at the position of the valve rod connecting nut 3 when the controlled valve is 8 percent open, and the compressed air source 57 is positioned on the controlled valve site.
The operation method of the high-efficiency cut-off type single-action pneumatic actuator comprises the steps of opening and closing a controlled valve, wherein the opening method of the controlled valve is as follows: opening a hydraulic manual stop valve 48 of the hydraulic cylinder module, starting a hydraulic oil pump 47, manually closing a pneumatic control manual stop valve 64, manually opening a compressed air source 57, controlling a two-position three-way electromagnetic valve 58 to be powered by a controller 65, enabling compressed air to enter a lower piston cavity of the cylinder module, discharging compressed air in an upper piston cavity of the cylinder module, enabling a piston 9 to move upwards, enabling a push rod 4 to drive a valve rod of a controlled valve to move upwards, compressing a spring of the spring cylinder module, and opening the valve; controlled valve closure involves two processes: the process of closing the controlled valve from 100% to 8% and the process of closing the controlled valve from 8% to full closing the controlled valve from 100% to 8% are as follows: the state of the hydraulic cylinder module is kept, the pneumatic control manual stop valve 64 is manually closed, the controller 65 controls the two-position three-way electromagnetic valve 58 to be powered off, the upper cavity and the lower cavity of the piston of the cylinder module are communicated, the piston moves downwards under the action of the compression spring force of the spring cylinder module, the push rod 4 drives the valve rod of the controlled valve to move downwards until the mechanical control two-position three-way valve 50 touches the outer edge of the valve rod connecting nut 3 of the controlled valve at the lower end of the push rod 4, and the valve is closed to 8 percent of opening; the process from 8% opening closing to full closing of the controlled valve is as follows: the state of the hydraulic cylinder module is kept, the pneumatic control manual stop valve 64 is kept to be closed, the two-position three-way electromagnetic valve 58 is kept in a power-off state, and after the outer edge of the valve rod connecting nut 3 at the lower end of the push rod 4 is touched by the mechanical control two-position three-way valve 50, the piston moves downwards under the combined action of spring force and cylinder force until the valve is completely closed.
Claims (4)
1. The utility model provides a high-efficiency cut-off type single-action pneumatic actuator, including the cylinder module, spring cylinder module and pneumatic control module, the cylinder module includes the cylinder, support (1) and push rod (4), the cylinder includes piston (9), cylinder (13), go up cylinder cap (14) and lower cylinder cap (8), the support is fixed on the lower cylinder cap (8) of cylinder module, piston (9) centre bore is passed to push rod (4) lower extreme, the middle part and the piston (9) fixed connection of push rod (4), push rod (4) lower extreme passes lower cylinder cap (8) centre bore and stretches into in support (1), upper end passes last cylinder cap (14) centre bore and stretches out last cylinder cap (14), position department in the middle part of push rod (4) is fixed with axial circlip (16) above last cylinder cap (14), push rod (4) lower extreme is equipped with adapter sleeve (2) and valve rod coupling nut (3), be equipped with the pointer on valve rod coupling nut (3), be equipped with scale (69) with hydraulic stem (68) and hydraulic stem coupling nut (67) with the pointer department on support (1), its characterized in that: the high-efficiency cut-off type single-acting pneumatic actuating mechanism further comprises a hydraulic cylinder module, the cylinder module further comprises a guide mechanism and a buffer mechanism, two guide holes are symmetrically formed in two sides of a center hole of a piston (9) of the cylinder module, a circle of grooves are formed in the outer circumference of the piston (9), and a circle of grooves are formed in the inner circumference of the guide hole of the piston (9); cylindrical holes are formed in positions, corresponding to the two guide holes in the piston (9), on the lower cylinder cover (8) of the cylinder module, and two round holes are formed in positions, corresponding to the two guide holes in the piston (9), on the upper cylinder cover (14); the guide mechanism comprises guide rods and guide belts, the two guide rods (10) are matched with two symmetrical guide holes on the piston (9), the lower ends of the two guide rods (10) respectively penetrate through the two guide holes on the piston (9) and are fixed in cylindrical holes of the lower cylinder cover (8), and the upper ends of the guide rods respectively penetrate through two round holes on the upper cylinder cover (14) and are fixed on the upper cylinder cover (14); the guide belt comprises an outer guide belt (24) and an inner guide belt (23), the outer guide belt (24) is a soft belt arranged in a groove on the outer circumference of the piston (9), the inner guide belt (23) is a soft belt arranged in a groove on the inner circumference of the guide hole of the piston (9); the buffer mechanism comprises a buffer block (7) and a fixed ring (6), wherein the buffer block (7) is a round sleeve, the buffer block (7) is sleeved on the push rod (4) and fixed below a central hole of a piston, the fixed ring (6) is fixedly arranged at the lower edge of the buffer block (7) of the push rod (4), the central hole of a lower cylinder cover (8) of the cylinder module is a stepped hole, a first-order hole is arranged near the lower surface of the lower cylinder cover (8), a shaft sleeve (5) matched with the first-order hole is arranged in the first-order hole, a second-order hole is arranged near the upper surface of the lower cylinder cover (8), and the second-order hole is matched with the buffer block (7);
the spring cylinder module comprises a spring cylinder (32), a baffle ring gland (33), a spring baffle ring (34), a spring seat (35), an inner spring (36), an outer spring (37) and a spring end cover (38), wherein the spring cylinder (32) is a barrel-shaped cylinder, a central hole is arranged at the center of the bottom surface of the spring cylinder (32), the central hole of the spring cylinder (32) is matched with the outer diameter of a shaft circlip (16) at the middle part of a push rod (4), a circular ring groove is arranged at the bottom of the inner wall of the spring cylinder (32), the baffle ring gland (33) is a cover matched with the inner diameter of the spring cylinder (32), a central hole is arranged at the center of the baffle ring gland (33), the central hole of the baffle ring gland (33) is matched with the outer diameter of the shaft circlip (16) at the middle part of the push rod (4), the outer edge part of the spring baffle ring (34) is a circular ring, the outer edge part of the spring baffle ring (34) is arranged in a circular ring groove at the bottom of the spring cylinder (32), the spring seat (35) is a circular barrel-shaped seat, the outer diameter of the spring baffle ring (35) is matched with the inner diameter of the spring cylinder (32), the central hole of the spring seat (35) is arranged at the center of the baffle ring gland (33) and the outer diameter of the push rod (4), the central hole of the spring baffle ring (35) is matched with the outer diameter of the spring seat (32) in sequence, the inner spring (36) is sleeved in the outer spring (37), the inner spring (36) and the outer spring (37) are arranged on a spring seat (35) in the spring cylinder (32), a central hole is formed in the center of the spring end cover (38), the spring end cover (38) is fixed on an upper opening of the spring cylinder (32), the inner spring (36) and the outer spring are tightly pressed, the bottom surface of the spring cylinder (32) is fixedly connected with an upper cylinder cover (14) of the cylinder module, the upper end of a push rod (4) of the cylinder module penetrates through the central hole of the bottom surface of the spring cylinder (32) to extend into the spring cylinder (32), and a shaft in the middle of the push rod (4) penetrates through the central hole of the bottom surface of the spring cylinder (32) and the central hole of the baffle ring gland (33) to be arranged below the central hole of the spring seat (35);
the hydraulic cylinder module comprises a hydraulic cylinder (43), an oil pressure pipeline (46), a hydraulic oil pump (47) and a hydraulic manual stop valve (48), wherein an inlet and an outlet of the hydraulic oil pump (47) are respectively connected to end interfaces of an upper cavity and a lower cavity of the hydraulic cylinder (43) through the oil pressure pipeline (46), an inlet and an outlet of the hydraulic manual stop valve (48) are respectively connected to end interfaces of the upper cavity and the lower cavity of the hydraulic cylinder (43) through the oil pressure pipeline (46), the hydraulic cylinder (43) is fixedly arranged on a spring end cover (38) of the spring cylinder module, a hydraulic rod of the hydraulic cylinder (43) stretches into the spring cylinder (32) and is fixedly connected with the upper end of a push rod (4), and the hydraulic oil pump (47) is connected with a hydraulic oil source;
the pneumatic control module is a pneumatic control system of the air cylinder module, the pneumatic control module comprises a mechanical control two-position three-way valve (50), a normally-closed two-position three-way pneumatic control valve (51), a pneumatic control reversing valve (52), a normally-closed two-position two-way pneumatic control valve I (53), a quick exhaust valve (54), a pressure gauge I (55), a filtering reducing valve (56), a compressed air source (57), a two-position three-way electromagnetic valve (58), a plug I (59), a normally-closed two-position two-way pneumatic control valve II (60), a normally-open two-way pneumatic control valve (61), a plug II (62), a pressure gauge II (63), a pneumatic control manual stop valve (64) and a controller (65), the compressed air source (57) is communicated with the lower piston cavity of the air cylinder module through a pipeline, the pipeline of the compressed air source (57) is sequentially filtered by the lower cavity of the piston (9) of the air cylinder module, the pressure gauge I (55), the quick exhaust valve (54) and the normally-closed two-position two-way pneumatic control valve I (53), the compressed air source (57) is communicated with the lower piston cavity of the air cylinder module by the pipeline of the air cylinder module and is connected with the lower piston of the pressure gauge II in series, the pressure gauge II is connected with the lower piston pipeline of the manual stop valve (64) and is connected with the lower piston pipeline of the manual stop valve (63) of the air cylinder module in series, a control valve loop is further connected in parallel to a pipe section between the pneumatic control manual stop valve (64) and the pressure gauge II (63), the control valve loop is divided into two paths, the first path is communicated with the normally-closed two-position two-way pneumatic control valve II (60), the control end of the normally-closed two-way pneumatic control valve II (60) is communicated with one interface of the pneumatic control reversing valve (52) and is simultaneously communicated with the control end of the pneumatic control reversing valve (52), the second path of the control valve loop is communicated with the normally-open two-position two-way pneumatic control valve (61), the other interface of the normally-open two-way pneumatic control valve (61) is communicated with the normally-closed two-position three-way pneumatic control valve (51), the control end of the normally-closed two-position three-way pneumatic control valve (51) is communicated with the second interface of the pneumatic control reversing valve (52), the control end of the normally-closed two-position two-way pneumatic control valve I (53) is communicated with the third interface of the pneumatic control reversing valve (52), the control end of the normally-position three-way valve I (58) is communicated with the outer edge of the valve (8) of the valve (3) at the valve stem (3), the valve opening of the valve (8) is connected with the valve (5), the valve (8) is connected with the valve (3) at the valve opening position of the valve (valve stem (3) and the valve (valve nut (valve) is connected with the valve nut, a compressed air source (57) is in the controlled valve site.
2. The high-efficiency, cut-off, single-acting pneumatic actuator of claim 1, wherein: the hydraulic rod is fixedly connected with the push rod (4) through a hydraulic rod connecting nut.
3. The high-efficiency, cut-off, single-acting pneumatic actuator of claim 1, wherein: the guide belt is a rubber belt or an engineering plastic belt.
4. A method of operating a high efficiency shut-off single acting pneumatic actuator of claim 1, comprising controlled valve opening and controlled valve closing, characterized by: the controlled valve opening method comprises the following steps: opening a hydraulic manual stop valve (48) of the hydraulic cylinder module, starting a hydraulic oil pump (47), manually closing a pneumatic control manual stop valve (64), manually opening a compressed air source (57), controlling a two-position three-way electromagnetic valve (58) to be powered by the controller (65), enabling compressed air to enter a lower piston cavity of the cylinder module, discharging compressed air in an upper piston cavity of the cylinder module, enabling a piston (9) to move upwards, enabling a push rod (4) to drive a valve rod of a controlled valve to move upwards, compressing a spring of the spring cylinder module, and opening the valve; the controlled valve closure includes two processes: the process of closing the controlled valve from 100% to 8% and the process of closing the controlled valve from 8% to full close are as follows: the state of the hydraulic cylinder module is kept, the pneumatic control manual stop valve (64) is manually closed, the controller (65) controls the two-position three-way electromagnetic valve (58) to lose electricity, the upper cavity and the lower cavity of the piston of the cylinder module are communicated, the piston moves downwards under the action of the compression spring force of the spring cylinder module, the push rod (4) drives the valve rod of the controlled valve to move downwards until the mechanical control two-position three-way valve (50) touches the outer edge of the valve rod connecting nut (3) of the controlled valve at the lower end of the push rod (4), and the valve is closed to 8 percent of opening; the process from 8% opening closing to full closing of the controlled valve is as follows: the state of the hydraulic cylinder module is kept, the pneumatic control manual stop valve (64) is kept to be closed, the two-position three-way electromagnetic valve (58) is kept in a power-off state, and after the outer edge of a valve rod connecting nut (3) at the lower end of a push rod (4) is touched by the mechanical control two-position three-way valve (50), the piston moves downwards under the combined action of spring force and cylinder force until the valve is completely closed.
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| CN201711319414.0A CN107842642B (en) | 2017-12-12 | 2017-12-12 | High-efficiency cut-off type single-action pneumatic actuating mechanism |
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| CN201711319414.0A CN107842642B (en) | 2017-12-12 | 2017-12-12 | High-efficiency cut-off type single-action pneumatic actuating mechanism |
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| CN107842642B true CN107842642B (en) | 2024-04-02 |
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| CN108868923B (en) * | 2018-07-05 | 2024-01-30 | 大连亨利测控仪表工程有限公司 | Three-way jet flow temperature and pressure reducing control system for heat supply of heat supply network |
| CN110864157A (en) * | 2019-12-20 | 2020-03-06 | 吴忠仪表有限责任公司 | Actuating mechanism for safety shut-off valve |
| CN112224452B (en) * | 2020-10-20 | 2022-02-01 | 北京卫星环境工程研究所 | Multiplexing type millisecond-level rapid pressure relief vacuum mechanism and rapid pressure relief test system |
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