CN115823331B

CN115823331B - Angular travel film type actuating mechanism

Info

Publication number: CN115823331B
Application number: CN202310032625.5A
Authority: CN
Inventors: 张世乐; 李继辉; 程睿; 丁华昀; 栗峥; 杜旻晟; 董�成; 冯敏; 刘建新; 何禹珉
Original assignee: Wuxi Score Automatic Control Equipment Co ltd
Current assignee: Wuxi Score Automatic Control Equipment Co ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-05-05
Anticipated expiration: 2043-01-10
Also published as: CN115823331A

Abstract

The invention discloses an angular travel film type actuating mechanism, which comprises a film type actuating mechanism body and an angular travel conversion assembly, wherein the angular travel conversion assembly comprises a mounting box, an output shaft, a crank and a connecting rod; the output shaft rotates and wears to establish on the mounting box, the push rod of film actuating mechanism body stretches into in the mounting box, the one end of crank is fixed on the output shaft be located on the part of mounting box, the crank other end pass through rod end joint bearing with the one end of connecting rod is articulated, the other end of connecting rod pass through joint ball bearing with the push rod ball of film actuating mechanism body is articulated. According to the invention, through the cooperation of the angular travel conversion assembly, on the basis of the film type actuating mechanism of the straight travel, the straight travel motion of the push rod is converted into the rotary motion of the output shaft through ingenious mechanism conversion, and the connecting gap is small, the transmission efficiency is high, and the precision is high.

Description

Angular travel film type actuating mechanism

Technical Field

The invention relates to the technical field of actuating mechanisms, in particular to an angular travel thin film actuating mechanism.

Background

The film type actuating mechanism has the characteristics of small return difference and dead zone range, high adjustment precision, long service life, high working stability and the like, and is widely applied to driving devices of various control valves.

With the progress of technology, many working condition occasions have appeared angle stroke control valves, such as eccentric rotary valves, V-shaped ball valves and the like, and compared with the traditional straight stroke regulating valves, the angle stroke regulating valve has the advantages of large flow capacity, small installation space, large regulating adjustable ratio, suitability for harsh working conditions and the like. For this reason, technical development of how to convert the linear motion of the thin film actuator into the rotational motion of the output shaft by means of structural conversion is very necessary.

Disclosure of Invention

The invention mainly aims to provide an angular travel film type actuating mechanism capable of converting straight travel motion of a push rod into angular travel motion.

In order to achieve the above purpose, the invention provides an angular travel film type actuator, which comprises a film type actuator body and an angular travel conversion assembly, wherein the angular travel conversion assembly comprises a mounting box, an output shaft, a crank and a connecting rod;

the output shaft rotates and wears to establish on the mounting box, the push rod of film actuating mechanism body stretches into the mounting box, the one end of crank is fixed the output shaft be located on the part of mounting box, the crank other end pass through rod end joint bearing with the one end of connecting rod is articulated, the other end of connecting rod pass through joint ball bearing with the push rod of film actuating mechanism body is articulated.

Further, a curved limiting block is further connected to the part, located in the installation box, of the output shaft, and two limiting bolts used for limiting and matching with the curved limiting block from two sides are arranged on the installation box in a penetrating mode.

Further, the film type actuating mechanism body comprises an upper film cover, a lower film cover, a push rod, a film assembly clamped between the upper film cover and the lower film cover, and a plurality of springs arranged between the film assembly and the lower film cover, wherein the push rod penetrates through the upper film cover, the film assembly and the lower film cover and is connected with the film assembly, and the springs are uniformly distributed at intervals along the circumferential direction of the push rod.

Further, the film type actuating mechanism body further comprises a downstroke limit sleeve, the lower end of the push rod extends into the installation box, a first threaded bushing is sleeved at the lower end of the push rod in a threaded mode, the joint ball bearing is located in the first threaded bushing, the connecting rod extends into the first threaded bushing to be connected with the joint ball bearing, a second threaded bushing is sleeved on the connecting rod in a threaded mode, and the downstroke limit sleeve is fixedly sleeved outside the first threaded bushing.

Further, the film actuating mechanism body still includes the upstroke stop collar, the block is installed at the top of going up the membrane lid, the upper end of push rod stretches into the block, the push rod be located cover is equipped with the end pipe on the part of diaphragm subassembly top, the lower extreme card of end pipe is established on the diaphragm subassembly, the upper end threaded connection of push rod has the lock nut that is used for locking the end pipe, the upstroke stop collar is fixed to be cup jointed the upper end of push rod and is located outside the lock nut.

Further, the membrane assembly comprises a membrane clamped between the upper membrane cover and the lower membrane cover, a supporting plate supported at the bottom of the membrane and a membrane plate pressed at the top of the membrane, and the membrane plate, the membrane and the supporting plate are fixedly connected through screws penetrating through the membrane plate and the membrane and being connected to the supporting plate in a threaded mode.

Further, the spring is in through last spring holder and lower spring holder setting the diaphragm subassembly with down between the membrane lid, the mounting groove has been seted up to the bottom of layer board, be fixed with the centering plate on the groove diapire of mounting groove, it establishes to go up the spring holder card in the mounting groove, go up the top of spring holder install with centering plate complex thrust roller bearing, the spring holder is fixed down on the membrane is covered down, the spring coupling is in go up the spring holder with down between the spring holder.

Further, the bottom of going up the spring holder is connected with the guide cylinder, the guide post is connected at the top of lower spring holder, the guide post slides and inserts and establish in the guide cylinder, the spring housing is established the guide cylinder with outside the guide post, the bottom of centring plate be equipped with guide cylinder location complex centering boss.

Further, an upper guide seat is arranged on the upper film cover, the end pipe penetrates through the upper guide seat, an elastic check ring, a first distance check ring, a first dust ring, a second distance check ring and a lip-shaped sealing ring which are sequentially abutted are arranged on the upper part of the inner peripheral wall of the upper guide seat from top to bottom, and an upper guide sleeve is arranged on the lower part of the inner peripheral wall of the upper guide seat.

Further, a lower guide seat is arranged on the lower film cover, the push rod penetrates through the lower guide seat, and two lower guide sleeves and second dust-proof rings which are distributed at intervals are arranged on the inner peripheral wall of the lower guide seat from top to bottom.

The beneficial effects of the invention are as follows:

according to the design of the invention, the linear motion of the push rod of the film type actuating mechanism body can drive the crank to swing around the rod end joint bearing, then the swing of the crank can drive the output shaft to rotate, the connecting rod is hinged with the push rod ball through the joint ball bearing, the problem that the point on the shifting fork swings in the linear motion process can be solved, and the push rod does not swing.

Drawings

FIG. 1 is a schematic cross-sectional view of an angular travel type actuator according to an embodiment of the present invention.

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is an enlarged view at B in fig. 1.

Fig. 4 is an enlarged view at C in fig. 1.

Fig. 5 is an enlarged view of D in fig. 1.

FIG. 6 is an exploded view of the angular travel conversion assembly according to one embodiment of the present invention.

Reference numerals illustrate:

10. a thin film actuator body; 101. a film cover is arranged; 102. a lower film cover; 103. a push rod; 104. a spring; 105. a membrane; 106. a supporting plate; 107. a membrane plate; 108. a lower stroke limit sleeve; 109. a first threaded bushing; 110. a second threaded bushing; 111. an upper travel limit sleeve; 112. capping; 113. an end pipe; 114. a lock nut; 115. a screw; 116. an upper spring seat; 117. a lower spring seat; 118. a mounting groove; 119. a centering plate; 120. thrust roller bearings; 121. a guide cylinder; 122. a guide post; 123. centering boss; 124. an upper guide seat; 125. a circlip; 126. a first distance retainer ring; 127. a first dust ring; 128. a second distance retainer ring; 129. a lip seal; 130. an upper guide sleeve; 131. a lower guide seat; 132. a lower guide sleeve; 133. a second dust ring; 134. plugging a screw; 135. a groove; 136. installing a bolt; 137. a guide sleeve;

20. an angular travel conversion assembly; 201. a mounting box; 202. an output shaft; 203. a crank; 204. a connecting rod; 205. a rod end joint bearing; 206. a spherical ball bearing; 207. a curved limiting block; 208. and a limit bolt.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. Embodiments and features of embodiments in this application may be combined with each other without conflict.

See fig. 1-6.

The angular travel thin film type actuating mechanism comprises a thin film type actuating mechanism body 10 and an angular travel conversion assembly 20, wherein the angular travel conversion assembly 20 comprises a mounting box 201, an output shaft 202, a crank 203 and a connecting rod 204;

the output shaft 202 rotates and passes through the mounting box 201, the push rod 103 of the thin film actuator body 10 stretches into the mounting box 201, one end of the crank 203 is fixed on a part of the output shaft 202 located in the mounting box 201, the other end of the crank 203 is hinged with one end of the connecting rod 204 through a rod end joint bearing 205, and the other end of the connecting rod 204 is hinged with the push rod 103 of the thin film actuator body 10 through a joint ball bearing 206.

In an embodiment, a curved limiting block 207 is further connected to a portion of the output shaft 202 located in the installation box 201, and two limiting bolts 208 for respectively performing limiting fit with the curved limiting block 207 from two sides are arranged on the installation box 201 in a penetrating manner. In the crank swinging process, the curved limiting block is abutted against the limiting bolt, and the crank stops swinging in the corresponding direction, so that the rotating range of the output shaft can be limited, and the executing requirement of opening and closing of a specific valve can be met.

In an embodiment, the thin film actuator body 10 includes an upper film cover 101, a lower film cover 102, a push rod 103, a film 105 assembly clamped between the upper film cover 101 and the lower film cover 102, and a plurality of springs 104 disposed between the film 105 assembly and the lower film cover 102, wherein the push rod 103 passes through the upper film cover 101, the film 105 assembly, the lower film cover 102, and is connected with the film 105 assembly, and the plurality of springs 104 are uniformly distributed at intervals along a circumferential direction of the push rod 103. The structure is a type of typical film type pneumatic actuator, the electric or air signal from the regulator is converted into air pressure by the positioner and is input into the film chamber to act on the film to generate thrust force, so that the push rod moves, and meanwhile, the compression spring and the reaction force born by the spring balance, so that the push rod reaches a preset position. However, in the prior art, a spring and a push rod are generally coaxially arranged, and the spring is uniformly distributed at intervals along the circumferential direction of the push rod, so that the springs have larger rigidity and can generate larger output force.

In specific implementation, four springs can be arranged and distributed in a circumferential array with the axis of the push rod as the center.

In an embodiment, the thin film actuator body 10 further includes a downstroke limit sleeve 108, the lower end of the push rod 103 extends into the installation box 201, a first threaded bushing 109 is screwed on the lower end of the push rod 103, the spherical joint bearing 206 is located in the first threaded bushing 109, the connecting rod 204 extends into the first threaded bushing 109 and is connected with the spherical joint bearing 206, a second threaded bushing 110 is screwed on the connecting rod 204, and the downstroke limit sleeve 108 is fixedly sleeved outside the first threaded bushing 109. The lower stroke limit sleeve is used for forming limit fit with the lower film cover, when the push rod moves upwards to the position where the lower stroke limit sleeve is abutted against the lower film cover, the push rod stops moving, the moving distance of the push rod can be controlled, the first threaded bushing and the second threaded bushing play a role in mounting and connecting, the connecting rod is a threaded rod, and the second threaded bushing is in threaded sleeve connection with the connecting rod and can be locked through a nut and a gasket; in particular embodiments, the connecting rod may be threadably coupled to the rod end knuckle bearing and the nut and washer lock, with the rod end knuckle bearing coupled to the crank by the jack screw 134.

In an embodiment, the thin film actuator body 10 further includes an upper stroke limit sleeve 111, a cap 112 is mounted on the top of the upper film cover 101, the upper end of the push rod 103 extends into the cap 112, an end pipe 113 is sleeved on a portion of the push rod 103 above the membrane 105 assembly, the lower end of the end pipe 113 is clamped on the membrane 105 assembly, a locking nut 114 for locking the end pipe 113 is connected with the upper end of the push rod 103 in a threaded manner, and the upper stroke limit sleeve 111 is fixedly sleeved on the upper end of the push rod 103 and located outside the locking nut 114. The upper travel limit sleeve is used for forming limit fit with the upper guide seat, when the push rod moves downwards to the upper travel limit sleeve to collide with the upper guide seat, the push rod stops moving, the moving distance of the push rod can be controlled, the movement range of the film head part of the actuating mechanism is ensured, the movement exceeding the measuring range is limited, the rotating angle can be fixed, the angle travel is limited, and the output torque of the actuating mechanism is controlled more accurately.

In one embodiment, the membrane 105 assembly includes a membrane 105 clamped between the upper membrane cover 101 and the lower membrane cover 102, a pallet 106 supported on the bottom of the membrane 105, and a membrane plate 107 pressed on top of the membrane 105, the membrane plate 107, the membrane 105, and the pallet 106 being secured by a screw 115 threaded onto the pallet 106 through the membrane plate 107, the membrane 105. The diaphragm is pressed between upper and lower membrane covers to form the cavity that can receive gas between diaphragm and upper membrane cover, in the air pressure input to the membrane room, the diaphragm produces thrust under the effect of air pressure, the push rod produces along its axial displacement, the steady operation of diaphragm is the key of this actuating mechanism steady operation, diaphragm and layer board are fixed the clamping of diaphragm between two parts, ensure actuating mechanism in the motion process, the diaphragm can not break away from the layer board, diaphragm and layer board provide better supporting role for the diaphragm, can be with the better transmission of the pressure of high-pressure air to the layer board like this, and better assurance diaphragm's life.

In an embodiment, the spring 104 is disposed between the diaphragm 105 assembly and the lower diaphragm cover 102 through an upper spring seat 116 and a lower spring seat 117, a mounting groove 118 is formed at the bottom of the supporting plate 106, a centering plate 119 is fixed on the bottom wall of the mounting groove 118, the upper spring seat 116 is clamped in the mounting groove 118, a thrust roller bearing 120 matched with the centering plate 119 is mounted on the top of the upper spring seat 116, the lower spring seat 117 is fixed on the lower diaphragm cover 102, and the spring 104 is connected between the upper spring seat 116 and the lower spring seat 117. By the design, the inclination and internal stress of the planar roller bearing in the up-and-down movement process of the spring can be reduced, and the rotation movement generated in the compression process of the spring can be effectively compensated, so that the internal stress can not exist except the up-and-down elasticity required by the user in the action process of the spring, and the problems of deformation of the spring caused by torsion, inaccuracy of the provided force value and the like are solved. The centering plate is used as a transition part between the inner wall of the supporting plate and the roller bearing, the elastic force provided by the spring can be transmitted to the tray through the roller bearing, and the part only bears the action of positive pressure.

In an embodiment, a guide cylinder 121 is connected to the bottom of the upper spring seat 116, a guide post 122 is connected to the top of the lower spring seat 117, the guide post 122 is slidably inserted into the guide cylinder 121, the spring 104 is sleeved outside the guide cylinder 121 and the guide post 122, and a centering boss 123 that is matched with the guide cylinder 121 in a positioning manner is provided at the bottom of the centering plate 119. The spring holder increases guide structure, can increase the stability of spring and push rod, considers simple to operate, designs to be formed by guide post and guide cylinder cooperation, and when the spring received the compression, the relative motion direction of guide post and guide cylinder was unanimous with the direction that the spring was compressed, produced decurrent displacement for the guide post promptly, and atmospheric pressure reduces in the membrane room, and the spring resets, and the guide cylinder produces ascending displacement for the guide post.

In order to ensure that the center of the spring is always consistent with the axis of the guide structure, two ends of the spring are respectively clamped in grooves 135 formed in the upper spring seat 116 and the lower spring seat 117.

In a specific implementation, the guide post 122 is of an internally threaded pipe structure, the guide post 122 is fixed at the top of the lower spring seat 117 by a mounting bolt 136, and a guide sleeve 137 is embedded on the inner peripheral wall of the guide cylinder 121 for improving the stability of sliding fit.

In an embodiment, the upper membrane cover 101 is provided with an upper guide seat 124, the end pipe 113 penetrates through the upper guide seat 124, an elastic retainer ring 125, a first distance retainer ring 126, a first dust retainer ring 127, a second distance retainer ring 128 and a lip seal ring 129 which are sequentially abutted are installed on the upper portion of the inner peripheral wall of the upper guide seat 124 from top to bottom, and an upper guide sleeve 130 is installed on the lower portion of the inner peripheral wall of the upper guide seat 124. The upper guide seat and the upper guide sleeve are used for ensuring the structural stability of the upper film head part when the corner stroke motion is performed, the design forms a dustproof, sealing and guiding functional module, the upper guide sleeve plays a role in guiding internal parts, coaxiality of the two parts is ensured, the lip-shaped sealing ring is a main sealing ring and can be reliably sealed with the outside, the first dust-proof ring clamped by the first fixed-distance retainer ring and the second fixed-distance retainer ring is of a dustproof structure, and the lip-shaped sealing ring is of an auxiliary sealing structure, so that impurities such as dust on an end pipe can be prevented from entering a sealing area of the lip-shaped sealing ring, and the lip-shaped sealing ring is prevented from being interfered and losing efficacy. The elastic check ring is arranged to compress and clamp the first dust ring, so that the first dust ring is ensured to always maintain a certain compression rate, and therefore, the first dust ring is effectively sealed.

In an embodiment, the lower membrane cover 102 is provided with a lower guide seat 131, the push rod passes through the lower guide seat 131, and the inner peripheral wall of the lower guide seat 131 is provided with two lower guide sleeves 132 and second dust rings 133 which are distributed at intervals from top to bottom. The lower guide seat and the lower guide sleeve are used for ensuring the structural stability of the lower film head part when the corner stroke motion is performed, and the second dust ring is used for preventing dust from entering the actuating mechanism.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The angular travel film type actuating mechanism comprises a film type actuating mechanism body and is characterized by further comprising an angular travel conversion assembly, wherein the angular travel conversion assembly comprises a mounting box, an output shaft, a crank and a connecting rod;

the output shaft is rotatably arranged on the mounting box in a penetrating manner, a push rod of the thin film type actuating mechanism body extends into the mounting box, one end of the crank is fixed on the part of the output shaft, which is positioned in the mounting box, the other end of the crank is hinged with one end of the connecting rod through a rod end joint bearing, and the other end of the connecting rod is hinged with the push rod of the thin film type actuating mechanism body through a joint ball bearing;

the thin film type actuating mechanism body comprises an upper film cover, a lower film cover, a push rod, a film assembly clamped between the upper film cover and the lower film cover and a plurality of springs arranged between the film assembly and the lower film cover, wherein the push rod penetrates through the upper film cover, the film assembly and the lower film cover and is connected with the film assembly, and the springs are uniformly distributed at intervals along the circumferential direction of the push rod;

the thin film type actuating mechanism body further comprises a downstroke limit sleeve, the lower end of the push rod extends into the installation box, a first threaded bushing is sleeved at the lower end of the push rod in a threaded mode, the joint ball bearing is located in the first threaded bushing, the connecting rod extends into the first threaded bushing to be connected with the joint ball bearing, a second threaded bushing is sleeved on the connecting rod in a threaded mode, and the downstroke limit sleeve is fixedly sleeved outside the first threaded bushing;

the membrane assembly comprises a membrane clamped between the upper membrane cover and the lower membrane cover, a supporting plate supported at the bottom of the membrane and a membrane plate pressed at the top of the membrane, and the membrane plate, the membrane and the supporting plate are fixedly connected through screws penetrating through the membrane plate and the membrane and connected to the supporting plate in a threaded manner;

the spring is arranged between the diaphragm assembly and the lower membrane cover through an upper spring seat and a lower spring seat, an installation groove is formed in the bottom of the supporting plate, a centering plate is fixed on the bottom wall of the installation groove, the upper spring seat is clamped in the installation groove, a thrust roller bearing matched with the centering plate is arranged at the top of the upper spring seat, the lower spring seat is fixed on the lower membrane cover, and the spring is connected between the upper spring seat and the lower spring seat;

the bottom of going up the spring holder is connected with the guide cylinder, the guide post is connected at the top of lower spring holder, the guide post slides and inserts to establish in the guide cylinder, the spring housing is established the guide cylinder with outside the guide post, the bottom of centring plate be equipped with guide cylinder location complex centering boss.

2. The angular travel film actuator of claim 1, wherein a curved limiting block is further connected to a portion of the output shaft located in the mounting box, and two limiting bolts for limiting the curved limiting block from two sides are provided in the mounting box.

3. The angular travel thin film actuator of claim 1, wherein the thin film actuator body further comprises an upper travel limit sleeve, a cap is mounted on the top of the upper film cover, the upper end of the push rod extends into the cap, an end pipe is sleeved on the part, above the diaphragm assembly, of the push rod, the lower end of the end pipe is clamped on the diaphragm assembly, a locking nut for locking the end pipe is connected to the upper end of the push rod through threads, and the upper travel limit sleeve is fixedly sleeved on the upper end of the push rod and is positioned outside the locking nut.

4. The angular travel film actuator of claim 3, wherein the upper film cover is provided with an upper guide seat, the end pipe penetrates through the upper guide seat, the upper part of the inner peripheral wall of the upper guide seat is provided with an elastic check ring, a first spacing check ring, a dust ring, a second spacing check ring and a lip-shaped sealing ring which are sequentially abutted from top to bottom, and the lower part of the inner peripheral wall of the upper guide seat is provided with an upper guide sleeve.

5. The angular travel film actuator of claim 1, wherein a lower guide seat is mounted on the lower film cover, the push rod penetrates through the lower guide seat, and two lower guide sleeves and dust rings which are distributed at intervals are mounted on the inner peripheral wall of the lower guide seat from top to bottom.