阅读说明：本技术 一种大扭矩双薄膜角行程执行器 (Large-torque double-film angular travel actuator ) 是由 向煜 吴伟 孙有根 于 2020-03-20 设计创作，主要内容包括：本发明公开了一种大扭矩双薄膜角行程执行器,包括从左向右依次布置安装的正作用薄膜执行器(A)、曲柄传动箱、反作用薄膜执行器(B),所述左右2个执行器分别由支撑架,薄膜前端盖,薄膜后端盖,膜片和复位弹簧组在紧固螺栓的固定下依次安装组成；本发明提出了一种运动精度高,结构设计简单可靠,输出扭矩大的气动角行程薄膜执行器,可配合各类角行程控制阀,特别是阀门开启扭矩大的大口径角行程阀门。本发明设计巧妙,结构简单、生产成本低,可以良好的与各类角行程阀门配合,并且相比传统薄膜角行程执行器,本发明的输出扭矩可以大大提高,并且在高扭矩的情况下保证输出精度。(The invention discloses a large-torque double-film angular travel actuator, which comprises a positive film actuator (A), a crank transmission case and a reaction film actuator (B) which are sequentially arranged from left to right, wherein the left and right actuators are respectively formed by sequentially arranging a support frame, a film front end cover, a film rear end cover, a diaphragm and a reset spring group under the fixation of a fastening bolt; the invention provides a pneumatic angular travel film actuator which is high in movement precision, simple and reliable in structural design and large in output torque, and can be matched with various angular travel control valves, particularly a large-caliber angular travel valve with large valve opening torque. The invention has the advantages of ingenious design, simple structure and low production cost, can be well matched with various angular travel valves, can greatly improve the output torque compared with the traditional film angular travel actuator, and ensures the output precision under the condition of high torque.)

1. A large-torque double-film angular travel actuator is used for driving an angular travel regulating valve to do angular motion of 0-90 degrees and is characterized by comprising a positive action film actuator (A), a crank transmission case and a reverse action film actuator (B) which are sequentially arranged from left to right, wherein the left and right actuators are respectively formed by sequentially mounting a support frame, a film front end cover, a film rear end cover, a diaphragm and a reset spring group under the fixation of a fastening bolt; a push rod, a transmission output spline, a rolling bearing, a crank fork, a transmission rod, a guide shaft, a limiting slide block and an actuator limiting position limiter are arranged in the crank case, so that the horizontal thrust jointly output by the actuator A and the actuator B is converted into the torque required by the angular travel regulating valve through the transmission output spline, and can rotate within the range of 0-90 degrees or other set angle ranges; push rods of actuators at two ends of the positive actuator (A) and the reverse actuator (B) are coupled together through the fixing of a limiting slide block; meanwhile, one end of the limiting slide block is connected with the actuator push rods on the two sides, and the other end of the limiting slide block is connected with the guide shaft, so that the output thrust of the left actuator and the output thrust of the right actuator are on the same straight line; the limiting sliding block is provided with a rolling bearing, the movable end of the rolling bearing is inserted into the shifting and inserting crank, and the other end of the shifting and inserting crank is an actuator torque output end through a key groove; the air source is connected with the left and right actuators through a communicating pipe, so that the actuators output thrust in the same direction.

2. A high torque dual diaphragm angular travel actuator according to claim 1, wherein the positive diaphragm actuator (a) and the negative diaphragm actuator (B) are moved horizontally to the left or right simultaneously by the cooperation of the air supply connection tube.

3. The high-torque double-film angular travel actuator according to claim 2, wherein the positive-acting film actuator (A) and the negative-acting film actuator (B) synchronously operate leftwards or rightwards under the combined action of the pressure of the air source communicating pipe and output linear thrust, and thrust output rods of the actuators (A) and (B) are fixed together through a limiting slide block and are horizontally arranged, and the thrust of the actuators (A) and (B) is ensured to be on the same horizontal line.

4. The large-torque double-film angular travel actuator according to claim 1, wherein push rods of the actuator A and the actuator B penetrate through transmission grooves of the crank transmission fork lever through rolling bearings arranged on the limiting sliding blocks, and the limiting sliding blocks push the crank transmission rod through the rolling bearings to convert linear travel thrust into angular travel torque under the action of an air source.

5. The large-torque double-film angular travel actuator according to claim 1, wherein in order to prevent the push rods of the actuator A and the actuator B from being damaged by excessive unbalanced force caused by deflection of linear thrust in the process of converting the linear travel into the angular travel, a guide shaft is arranged inside the transmission case so as to ensure that the thrust of the left actuator and the thrust of the right actuator are kept horizontal.

6. A large-torque double-film angular travel actuator as claimed in claim 1, wherein the rolling bearing on the limit slider can be implemented by a fisheye ball bearing, a needle bearing or an oil-free bearing.

7. The large-torque double-film angular travel actuator according to claim 1, wherein the crank transmission case further comprises a limiting mechanism, the limiting mechanism is composed of a plurality of limiting bolts, and threaded holes are machined in the crank transmission case body to mount the limiting bolts; the limiting bolt and the limiting part arranged on the crank transmission shifting fork act together, so that the actuator rotates within 0-90 degrees or other specific angle ranges.

8. The large-torque double-film angular travel actuator according to claim 1, wherein the actuator rotates torque to transmit the torque to the regulating valve through a crank fork, wherein the crank fork can be machined in a spline or square shaft mode according to different transmission torque sizes.

9. The large-torque double-membrane angular travel actuator according to claim 1, further comprising an air source communicating pipe, a valve position feedback mechanism and a valve position air source conversion system, wherein the valve position feedback mechanism and the positioner act together, the supply of compressed air of the air source communicating pipe is adjusted by setting the valve position to be compared with the current valve position, the air source pressure borne by the actuator membrane is limited, and the air source can be processed by a filtering and reducing valve; the shifting fork transmission rod and the valve position feedback mechanism are concentrically arranged, move together and penetrate through the crank transmission box to be arranged up and down; the valve position air source conversion system comprises an air source pressure regulating and filtering device, a quick exhaust control valve and an exhaust silencer.

Technical Field

The invention relates to the field of pneumatic actuating mechanisms, in particular to an improvement of a film type angular travel actuator of a large-caliber pneumatic adjusting butterfly valve.

Background

In many fluid regulation and control fields, various angle stroke regulating valves are required to be used for automatic control, and usually, a cylinder angle stroke actuator or an electric angle stroke actuator is selected for a large-caliber angle stroke regulating valve because the torque required by the large-caliber angle stroke regulating valve in work is too large to be matched with an angle stroke film actuator with enough torque. The cylinder type actuator has larger friction for ensuring the sealing of the piston and the cylinder body during movement, so that the adjustment precision is poor, and the dead zone and the return difference in the adjustment process are overlarge. The electric angular travel actuator is high in manufacturing cost and needs a special power supply for supplying power, and particularly has various conditions when being used in some explosion-proof areas.

The pneumatic film type actuator pushes the rubber diaphragm to move forwards by compressed air during the action, and the diaphragm does not have any frictional contact with the diaphragm cover during the action and does not need to overcome the frictional force, so the film type actuator has the advantages of high action sensitivity, small dead zone and return difference and the like which cannot be compared with an air cylinder actuator. Compared with an electric actuator, the pneumatic thin-film type actuator has the advantages of simple structure, no need of special power supply, low manufacturing cost and the like, so that the advantages of the pneumatic thin-film type actuator are fully exerted, the control precision is ensured by the combined action of 2 sets of thin-film actuators, and the torque of the existing angular travel actuator is greatly improved.

Disclosure of Invention

Aiming at the problems, the pneumatic film type actuator has the advantages of high control precision, small dead zone return difference and the like, the torque of the pneumatic film type actuator is improved through the design of the double-film angular travel actuator, and the application range of the traditional angular travel film actuator is greatly expanded. The actuator has wide adaptability and can be matched with various angular travel valves, particularly large-caliber angular travel valves with high torque requirements.

In order to solve the technical problem, the invention provides a large-torque double-film angular travel actuator which is used for driving an angular travel regulating valve to make 0-90-degree angular motion and comprises a positive film actuator (A), a crank transmission case and a reaction film actuator (B) which are sequentially arranged from left to right; the left and right actuators are respectively formed by sequentially mounting a support frame, a film front end cover, a film rear end cover, a diaphragm and a reset spring group under the fixation of a fastening bolt; the inside of the crankcase is provided with: the device comprises a push rod, a rolling bearing, a crank shifting fork, a transmission rod, a transmission output spline, a guide shaft, a limiting slide block and an actuator limiting position limiter, wherein the push rod, the rolling bearing, the crank shifting fork, the transmission rod, the transmission output spline, the guide shaft, the limiting slide block and the actuator limiting position limiter are used for converting horizontal thrust jointly output by an actuator A and an actuator B into torque required by an angular travel regulating valve through the transmission output spline and can rotate within the range of 0-90 degrees or other; push rods of actuators at two ends of the positive actuator (A) and the reverse actuator (B) are coupled together through the fixing of a limiting slide block; meanwhile, one end of the limiting slide block is connected with the actuator push rods on the two sides, and the other end of the limiting slide block is connected with the guide shaft, so that the output thrust of the left actuator and the output thrust of the right actuator are on the same straight line; the limiting sliding block is provided with a rolling bearing, the movable end of the rolling bearing is inserted into the shifting and inserting crank, and the other end of the shifting and inserting crank is an actuator torque output end through a key groove; the air source is connected with the left and right actuators through a communicating pipe, so that the actuators output thrust in the same direction.

Preferably, the positive membrane actuator (A) and the negative membrane actuator (B) are simultaneously horizontally moved leftwards or rightwards and leftwards under the combined action of the air source communicating pipe.

Preferably, the positive film actuator (A) and the negative film actuator (B) synchronously operate leftwards or rightwards under the combined action of the pressure of the air source communicating pipe and output linear thrust, and thrust output rods of the actuators (A) and (B) are fixed together through a limiting slide block and are arranged horizontally, and the thrust of the actuators (A) and (B) is ensured to be on the same horizontal line.

Preferably, push rods of the actuator A and the actuator B penetrate through a transmission groove of the crank transmission shifting fork rod through rolling bearings arranged on the limiting sliding blocks, and the limiting sliding blocks push a crank transmission rod through the rolling bearings to convert straight stroke thrust into angular stroke torque under the action of an air source.

Preferably, in order to prevent the push rods of the actuator A and the actuator B from being damaged due to overlarge unbalanced force caused by deflection of linear thrust in the process of converting the linear stroke into the angular stroke, a guide shaft is arranged in the transmission case so as to ensure that the thrust of the left actuator and the thrust of the right actuator are kept horizontal.

Preferably, the rolling bearing on the limiting slide block can be realized by a fisheye ball bearing, a needle bearing or an oil-free lubrication bearing.

Preferably, the crank transmission case further comprises a limiting mechanism which consists of a plurality of limiting bolts, and threaded holes are machined in the crank transmission case body so as to install the limiting bolts; the limiting bolt and the limiting part arranged on the crank transmission shifting fork act together, so that the actuator rotates within 0-90 degrees or other specific angle ranges.

Preferably, the actuator rotates the torque and transmits the torque to the regulating valve through a crank fork, wherein the crank fork can be processed in the form of splines and square shafts according to different transmission torque sizes.

Preferably, the device is also provided with an air source communicating pipe, a valve position feedback mechanism and a valve position air source conversion system, wherein the valve position feedback mechanism and the positioner act together, the supply of compressed air of the air source communicating pipe is adjusted by setting the comparison between the valve position and the current valve position, the air source pressure born by the actuator membrane is limited, and the air source can be processed by the filtering and reducing valve; the shifting fork transmission rod and the valve position feedback mechanism are concentrically arranged, move together and penetrate through the crank transmission box to be arranged up and down; the valve position air source conversion system comprises an air source pressure regulating and filtering device, a quick exhaust control valve and an exhaust silencer.

The pneumatic film actuator for driving the valve to rotate angularly provided by the invention is formed by the common action of 2 straight stroke actuators of a positive actuator (A) and a reaction actuator (B) so as to provide larger linear thrust. The driving push rod is connected with the diaphragm cover plate through a full-thread screw rod, and is provided with an adjusting nut and a locking nut which are used for adjusting the length of the driving push rod to be matched with the driving push rod of the reaction actuator (B). The push rod drives the air source to work, the air source is communicated with the upper membrane cover and the rubber membrane, and a sealing cavity is formed among the membrane, the upper membrane cover and the membrane head supporting ring through fastening bolts. With the increase of the air source pressure, the sealed cavity body can expand, and then the driving push rod arranged on the cover plate is pushed forwards through the membrane cover plate to form linear motion from bottom to top (from left to right) and output thrust.

The reaction actuator (B) is the same as the actuator (A) in external composition, the difference is that the internal part assembly is opposite to the actuator (A), the rubber diaphragm is arranged between the diaphragm head support ring and the lower diaphragm cover, the air source is communicated with the lower diaphragm cover and the rubber diaphragm, the lower sealing cavity can expand along with the increase of the pressure of the air source, and then the driving push rod arranged on the cover plate is pushed forwards through the diaphragm cover plate to form the linear motion from bottom to top (from right to left) and output the thrust.

The respective sealed cavities of the positive film actuator (A) and the negative film actuator (B) are communicated with each other through the same air source communicating pipe, and the air source pressures on the two sides are consistent. When the pressure of the air source is increased, the two actuators can operate in the positive direction, and when the pressure of the air source is reduced, the two actuators can simultaneously operate in the negative direction under the action of the elastic force of the respective return springs.

The crank transmission case be provided with the construction bolt hole respectively in the left and right sides for with positive effect film executor (A) and reaction film executor (B) fixed provide structural support, the drive push rod of two executor can be together fixed through spacing slider, in order to guarantee that two executor are in same water flat line when the operation, and to same direction output thrust.

The crank transmission case has the main function of converting the resultant force of the thrust output by the two straight stroke actuators into torque of an angular stroke through the crank shifting fork mechanism. The internal mechanism of the automatic positioning device comprises a shifting fork crank, a limiting sliding block, a limiting shaft, a transmission bearing, an output spline shaft and a valve position feedback shaft, wherein the output spline shaft and the valve position feedback shaft are two ends of the same part and are respectively matched with a valve driving end and a positioner feedback end.

The actuator A and the actuator B are connected together through the limiting slide block, the output straight stroke thrust is transmitted to the crank shifting fork through the transmission bearing arranged on the limiting slide block, the straight stroke is converted into the angular stroke through the crank shifting fork, and meanwhile, the crank shifting fork is coupled with the output spline shaft and the key groove to ensure that the two parts synchronously rotate. And the limiting sliding block is provided with a rolling bearing or an oilless sliding bearing and is used for carrying out torque coupling with the crank shifting fork. The upper part and the lower part of the crank shifting fork are respectively provided with a guide groove, and a bearing of the limiting slide block performs directional motion in the grooves. The crank transmission case is internally provided with a limiting shaft, and a limiting end of a limiting sliding block is sleeved in the shaft to ensure that the force transmission direction of the actuator (A) and the actuator (B) cannot be damaged by the angular motion of a shifting fork when the actuator (A) and the actuator (B) do straight-stroke motion, so that the force transmission direction and the force output direction are always along a straight line at any operation angle.

The valve position feedback mechanism consists of a pneumatic valve positioner, an air source communicating pipe, a filtering pressure reducing valve and a control signal source. Compressed air is conveyed to the inlet of the positioner after being filtered and regulated, after receiving an analog quantity proportional signal, the positioner starts to inject the compressed air into the closed die cavity of the actuator (A) and the actuator (B), and simultaneously feeds back a real-time valve position to the positioner through a valve position feedback device connected with an output rod of the actuator so as to realize the control requirement of the opening of the fixed valve.

The invention has simple design structure and innovatively provides a device which can convert linear thrust of two actuator film actuators into angular thrust together. Two film executor direct mount are on transmission box, and simple structure and compactness, and executor rigidity improves greatly.

Compared with the prior art, the invention has the following main advantages:

firstly, because the actuator converts the thrust of the two straight stroke film actuators into torque through the transmission case, compared with the traditional angular stroke film actuator, the actuator has larger torque and can be matched with a larger valve.

Secondly, a special transmission case is designed in the invention, the internal part of the transmission case can couple the thrust of the two actuators through a common push rod, and the thrust is converted into torque through a crank device. In order to ensure that the transmission process keeps high precision, the place with sliding friction in the design is replaced by an oil-free lubrication bearing, so that the execution mechanism can not be blocked in the operation process, and meanwhile, the fit clearance between parts can be reduced, thereby ensuring high-precision operation.

Compared with the traditional transmission case, the invention arranges the guide rod in the transmission case, thereby ensuring that the reasoning of the actuator A and the actuator B is on the same straight line in the operation process of the actuators, and effectively avoiding the bending of the push rod due to overlarge eccentric moment caused by the non-concentric thrust of the two actuators and the unbalanced stress of the spring group in the film actuator.

In the design of the crank, the limit point is considered for ensuring that the valve moves within the required range, and the valve can not be used in an over-range mode in the operation process through the limit bolt on the transmission case.

And fifthly, the air sources of the film actuator A and the film actuator B are communicated through a communicating pipe, so that the two actuators can keep synchronous motion.

Drawings

FIG. 1 is a general assembly view of the high torque dual diaphragm angular travel actuator of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at I;

FIG. 3 is a detailed view of the crank shaft of the present invention;

FIG. 4 is a detail of the slider of the present invention;

FIG. 5 is a pneumatic schematic of the actuator of the present invention;

in the figure, 1 is a support frame, 2 is a film front end cover, 3 is a film rear end cover, 4-a diaphragm, 5 is a return spring group, 6 is a transmission case, 7 is a limiting bolt, 8 is a shifting fork crank, 9 is a push rod, 10 is a guide shaft, 11 is a limiting sliding block, 12 is a fastening bolt, 13 is a rotating shaft, 14 is a rolling bearing, 15 is a sealing O-shaped ring I, 16 is a sealing O-shaped ring II, and 17 is a push rod connecting bolt.

Detailed Description

As shown in figures 1-4, the invention discloses a large-torque double-film angular travel actuator, and a pneumatic actuator comprises 2 straight travel actuators, namely a positive actuator (A) and a reverse actuator (B). The left actuator and the right actuator are respectively formed by sequentially mounting a support frame 1, a film front end cover 2, a film rear end cover 3, a diaphragm 4 and a reset spring group 5 under the fixation of a fastening bolt 12, 2-stage seals are arranged at the positions of push rods extending out of the actuators and are respectively a sealing O-shaped ring I15 and a sealing O-shaped ring II16, wherein the positive actuator (A) and the reverse actuator (B) are mounted in opposite modes and move in opposite directions under the action of an air source.

And push rods 9 of actuators at two ends of the positive actuator (A) and the reverse actuator (B) are coupled together under the fixation of a limit slide block 11. Meanwhile, one section of the limiting slide block 11 is connected with the push rods of the actuators on the two sides, and the other end of the limiting slide block is connected with the guide shaft 10, so that the output thrust of the left actuator and the output thrust of the right actuator are on the same straight line.

The limiting slide block 11 is provided with a rolling bearing 14, the movable end of the rolling bearing is inserted into the shifting and inserting crank 8, and the other end of the shifting and inserting crank 8 is an actuator torque output end through a key groove. The two sides of the shifting fork crank are respectively provided with a limiting point, and the limiting of the position of the initial point and the position of the final point are carried out through a limiting bolt 7 fixed on a transmission case 6 in the rotating process.

As shown in fig. 5, the actuator works under the action of an air source, and two ends of the positive actuator (a) and the negative actuator (B) respectively form a closed space by a diaphragm 4 (ethylene propylene diene monomer lining cloth) and a support frame 1, a film front end cover 2 and a film rear end cover 3. The air source is connected with the left and right actuators through a communicating pipe, so that the actuators output thrust in the same direction. The working process is as follows:

when the air source is pressurized, the membrane cavities of the actuators on the two sides are simultaneously expanded, so that the return spring group is pressed to push the push rod leftwards.

And secondly, when the pressure of the air source is reduced, the valve rod can be driven to move rightwards through the resilience force of the return spring. Thrust is transmitted to the poking and inserting crank 8 through the limiting slide block 11, and the poking and inserting crank 13 rotates around the central line of the poking and inserting crank, so that torque is output. The maximum output torque of the actuator can be adjusted by adjusting the sizes of the actuator diaphragms on the left side and the right side and the transmission arm force of the shifting fork crank.

The crank shifting fork 8 is respectively provided with a guide groove up and down, and the limiting slide block 11 makes directional movement in the grooves through a rolling bearing 14. The design of the rolling bearing 14 can effectively avoid the dead locking in the transmission process or the insensitive response caused by large friction force. The guide shaft 10 is arranged in the crank transmission case, and the limiting end of the limiting sliding block is sleeved in the shaft to ensure that the force transmission direction of the actuator (A) and the actuator (B) cannot be damaged by the angular motion of the shifting fork when the actuator (A) and the actuator (B) do straight-stroke motion, so that the force transmission direction and the force output direction are always along a straight line at any operation angle. The fitting degree of the whole straight stroke corner stroke is high, and the fitting effect is good. Meanwhile, the force of the actuator is always output linearly, so that the uneven stress of the return spring set 5 caused by the deflection moment of the diaphragm can be avoided. The reset spring group 5 comprises a group of a plurality of small springs, and the number of the spring groups or the types of the springs can be flexibly changed according to different design torques of the actuator.

The invention provides a pneumatic angular travel film actuator which is high in movement precision, simple and reliable in structural design and large in output torque, and can be matched with various angular travel control valves, particularly a large-caliber angular travel valve with large valve opening torque. Through the adjustment of the positioner to the air inlet pressure, the opening amount of the accurate control valve and the resistance of the actuator torque to the valve under a certain opening angle are ensured to meet, and the control valve does not creep. The invention has the advantages of ingenious design, simple structure and low production cost, can be well matched with various angular travel valves, can greatly improve the output torque compared with the traditional film angular travel actuator, and ensures the output precision under the condition of high torque.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.