CN221762749U

CN221762749U - Pneumatic actuator with limiting valve

Info

Publication number: CN221762749U
Application number: CN202323599921.8U
Authority: CN
Inventors: 王和建
Original assignee: Tk Tianjin Fluid Control Technology Co ltd
Current assignee: Tk Tianjin Fluid Control Technology Co ltd
Priority date: 2023-12-28
Filing date: 2023-12-28
Publication date: 2024-09-24
Anticipated expiration: 2033-12-28

Abstract

The utility model discloses a pneumatic actuator with a limit valve, which relates to the technical field of pneumatic actuators and comprises a valve main body, wherein the valve main body is provided with the pneumatic actuator main body, motor boxes are fixedly arranged at positions, close to the center, of the left side and the right side of the front surface of the pneumatic actuator main body, forward and reverse motors are fixedly arranged at the inner bottom walls of the two motor boxes, two output ends of the forward and reverse motors are fixedly connected with two bidirectional screw rods, sliding blocks are connected to the two bidirectional screw rods in a threaded manner, straight racks are symmetrically arranged in the pneumatic actuator main body, driven gears are arranged in the pneumatic actuator main body, limit pieces are fixedly connected to the tops of the driven gears, and sliding rods are fixedly arranged at positions, close to the center, of the left side and the right side of the front end wall and the rear end wall of the interior of the pneumatic actuator main body.

Description

Pneumatic actuator with limiting valve

Technical Field

The utility model relates to the technical field of pneumatic actuators, in particular to a pneumatic actuator with a limiting valve.

Background

The pneumatic actuator is an actuating device for driving the opening and closing or adjusting valve by air pressure, and is also called a pneumatic actuating mechanism or a pneumatic device, but is commonly called a pneumatic head. Pneumatic actuators are sometimes also equipped with certain auxiliary devices. Valve positioners and hand wheel mechanisms are commonly used. The valve positioner has the function of improving the performance of the actuator by utilizing a feedback principle, so that the actuator can accurately position according to the control signal of the controller. The hand wheel mechanism is used for directly operating the control valve when the control system fails due to power failure, gas interruption, no output of the controller or failure of the executing mechanism, so as to maintain normal production.

The utility model of China patent CN 109340438U discloses a pneumatic actuator with a limit valve, which comprises a shell, wherein a first mounting seat is fixedly arranged at the bottom of the shell, a rotating shaft penetrating through the first mounting seat and extending to the inside of the shell is movably arranged in the first mounting seat, and a gear positioned in the first mounting seat is fixedly arranged outside the rotating shaft. This take limit valve's pneumatic actuator gets into through the positive inlet port that sets up of shell, drive the inside pneumatic drive mechanism operation of shell, thereby drive the pivot and rotate, the pivot rotates and drives the gear and rotate, thereby drive the rack and move about, thereby drive the connecting plate and move about, when the pivot rotates limiting angle, limit valve work, thereby stop for the inlet port admittance of air, thereby make this pneumatic actuator can in time close gas, the probability that this pneumatic actuator sent out into the trouble has been reduced, the effectual life who increases this pneumatic actuator.

However, when the pneumatic actuator is limited in the above manner, accuracy of the limiting distance cannot be ensured.

Disclosure of utility model

The utility model provides a pneumatic actuator with a limiting valve, which aims to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a pneumatic actuator with limit valve, includes the valve main part, be provided with pneumatic actuator main part in the valve main part, pneumatic actuator main part's front left and right sides is close to the equal fixed mounting in position of center department has the motor case, two the equal fixed mounting of interior diapire of motor case has positive reverse motor, two the equal fixedly connected with two-way lead screw of output of positive reverse motor, two equal lead screw threaded connection has the slider on the two-way lead screw, two equal swing joint of one end that two positive reverse motors were kept away from respectively to two-way lead screw has the bearing frame, pneumatic actuator main part's inside symmetry is provided with straight rack, pneumatic actuator main part's inside is provided with driven gear, driven gear's top fixedly connected with locating part, the top of locating part is connected with twists the piece, the equal fixed mounting in position of both ends wall left and right sides is close to center department around pneumatic actuator main part.

Further, a plurality of the sliders have four, and the front center department of four sliders is close to the front and back both ends of top respectively with two-way lead screw pass through lead screw threaded connection, two liang of symmetries the mounting groove has all been seted up to the front end or the rear end of slider, a plurality of four corners that are close to front and back both ends wall in the mounting groove are all fixed mounting has the movable rod, a plurality of the movable rod is four in groups distribute in the inside of a plurality of mounting grooves and respectively with the front and back both ends wall fixed connection of a plurality of mounting grooves, a plurality of equal fixed mounting of inner center department of mounting groove has pressure sensor, a plurality of the inner of mounting groove is close to the equal fixed mounting of position of center department, a plurality of the spring is kept away from the one end equal fixedly connected with limiting plate of mounting groove, a plurality of limiting plate is kept away from the equal fixedly connected with press block of one end of a plurality of springs respectively, a plurality of press block cup joints the inner wall activity of a plurality of mounting grooves respectively.

Further, the pressure sensors are respectively arranged in the springs and are movably sleeved with the springs.

Further, one end of the sliding rod inside the installation groove penetrates through the plurality of limiting plates close to the installation groove and is close to the four corners, and the sliding rod is movably sleeved with the limiting plates.

Further, one end of the two-way screw rod far away from the bearing seat penetrates through the front end wall inside the pneumatic actuator main body and the two motor boxes respectively and is connected with the two forward and reverse motors respectively, the two-way screw rod is movably connected with the motor boxes and the connecting part of the pneumatic actuator main body respectively, and a sealing ring is arranged at the connecting part of the two-way screw rod and the pneumatic actuator main body.

Further, the adjacent ends of the pressing blocks are respectively and symmetrically close to the adjacent limiting parts.

Further, one ends of the two bearing seats, which are far away from the two bidirectional screw rods, are fixedly connected with the left side and the right side of the inner rear end wall of the pneumatic actuator main body, which are close to the center.

Further, the driven gears are respectively meshed with two straight rack gears.

Compared with the prior art, the utility model provides the pneumatic actuator with the limit valve, which has the following beneficial effects:

1. this pneumatic actuator with limit valve through setting up positive reverse motor, two-way lead screw, slide bar and slider, can adjust spacing distance, and when positive reverse motor does not drive, the displacement can not take place for the push down the board to ensure spacing distance's accuracy.

2. This pneumatic actuator with limit valve through setting up pressure sensor, spring and pressing block, can carry out real-time restriction to pneumatic actuator's range of motion, makes things convenient for follow-up use.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a diagram of the internal relationship of the pneumatic actuator body of the present utility model;

fig. 3 is a view showing the construction of the inside of the installation groove of the present utility model.

In the figure: 1. a pneumatic actuator body; 2. a motor case; 3. a valve body; 4. a screwing piece; 5. a straight rack; 6. a limiting piece; 7. a driven gear; 8. a forward and reverse rotation motor; 9. a slide bar; 10. a slide block; 11. a two-way screw rod; 12. a bearing seat; 13. a mounting groove; 14. a moving rod; 15. a spring; 16. a pressure sensor; 17. a limiting plate; 18. pressing the blocks.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, the utility model discloses a pneumatic actuator with a limit valve, which comprises a valve main body 3, wherein the valve main body 3 is provided with a pneumatic actuator main body 1, motor boxes 2 are fixedly arranged at positions, close to the center, on the left side and the right side of the front surface of the pneumatic actuator main body 1, forward and reverse motors 8 are fixedly arranged on the inner bottom walls of the two motor boxes 2, bidirectional screw rods 11 are fixedly connected to the output ends of the two forward and reverse motors 8, sliding blocks 10 are connected to the two bidirectional screw rods 11 in a threaded manner, bearing seats 12 are movably connected to one ends, far from the two forward and reverse motors 8, of the two bidirectional screw rods 11 respectively, straight racks 5 are symmetrically arranged in the pneumatic actuator main body 1, driven gears 7 are arranged in the pneumatic actuator main body 1, limit pieces 6 are fixedly connected to the tops of the driven gears 7, and sliding rods 9 are fixedly arranged at positions, close to the center, on the left side and the right side of the walls of the front end and the rear end of the pneumatic actuator main body 1.

Specifically, the four sliding blocks 10 are arranged, the positions, close to the tops, of the front centers of the four sliding blocks 10 are respectively connected with the front ends and the rear ends of the two bidirectional screw rods 11 through screw rod threads, the front ends or the rear ends of the two symmetrical sliding blocks 10 are respectively provided with a mounting groove 13, four corners, close to the front end wall and the rear end wall, of each of the plurality of mounting grooves 13 are respectively fixedly provided with a movable rod 14, the plurality of movable rods 14 are distributed in the plurality of mounting grooves 13 in groups and are respectively fixedly connected with the front end wall and the rear end wall of each of the plurality of mounting grooves 13, pressure sensors 16 are fixedly arranged at the positions, close to the centers, of the inner ends of the plurality of mounting grooves 13 are respectively fixedly provided with springs 15, one ends, far away from the mounting grooves 13, of each of the plurality of springs 15 are respectively fixedly connected with limiting plates 17, one ends, far away from each of the plurality of springs 15, of each limiting plates are respectively fixedly connected with pressing blocks 18, and each pressing block 18 is movably sleeved with the inner walls of the plurality of mounting grooves 13.

In this embodiment, stability of the pressing block 18 at the time of movement is ensured.

Specifically, the plurality of pressure sensors 16 are respectively disposed inside the plurality of springs 15 and are movably sleeved with the springs 15.

In this embodiment, it is ensured that the pressure sensor 16 can be triggered in time when the pressure is sufficiently high.

Specifically, one end of the sliding rod 9 inside the plurality of mounting grooves 13 respectively penetrates through a plurality of adjacent limiting plates 17 to be close to the four corners, and the sliding rod 9 is movably sleeved with the limiting plates 17.

In this embodiment, the convenient limiting plate 17 can move along the sliding rod 9 when moving, so as to avoid rollover of the pressing block 18.

Specifically, one end of the two bidirectional screw rods 11 far away from the bearing seat 12 penetrates through the front end wall inside the pneumatic actuator main body 1 and the two motor boxes 2 respectively and is connected with the two forward and reverse motors 8 respectively, the connection positions of the two bidirectional screw rods 11 and the motor boxes 2 and the pneumatic actuator main body 1 are movably connected, and a sealing ring is arranged at the connection position of the bidirectional screw rods 11 and the pneumatic actuator main body 1.

In this embodiment, the motor casing 2 and the pneumatic actuator main body 1 are prevented from being driven by the bidirectional screw rod 11 during rotation, and subsequent work is prevented from being affected.

Specifically, adjacent ends of the symmetrical pressing blocks 18 are respectively adjacent to the adjacent limiting members 6.

In this embodiment, it is ensured that the subsequent limiter 6 can contact the pressing block 18.

Specifically, one ends of the two bearing seats 12, which are far away from the two bidirectional screw rods 11, are fixedly connected with the left side and the right side of the inner rear end wall of the pneumatic actuator main body 1, which are close to the center.

In this embodiment, the stability of the bidirectional screw 11 at the time of rotation is enhanced.

Specifically, the driven gears 7 are respectively geared with the two straight racks 5.

In this embodiment, the following spur rack 5 is convenient to drive the driven gear 7 to rotate.

When in use, the forward and backward motor 8 is started, the forward and backward motor 8 drives the bidirectional screw rods 11 to rotate, the bidirectional screw rods 11 drive the corresponding sliding blocks 10 to move, the corresponding sliding blocks 10 are driven by the principle of the bidirectional screw rods 11 to approach or separate from the limiting pieces 6, after the forward and backward movement limiting of the limiting pieces 6 is completed, the driven gear 7 is driven by the straight rack 5 to rotate, the limiting pieces 6 are driven by the driven gear 7 to rotate forwards and backwards, after the limiting pieces 6 rotate clockwise to a certain position, the pressing blocks 18 close to the front end of one bidirectional screw rod 11 are contacted, the pressing blocks 18 close to the rear end of the other bidirectional screw rod 11 are stressed, when the pressing blocks 18 are stressed, the corresponding mounting grooves 13 are retracted inwards, the limiting plates 17 are pressed against the springs 15, after the spring 15 is compressed, the spring is contracted until one end of the limiting plate 17 far away from the pressing block 18 contacts the detection end with the pressure sensor 16, the straight rack 5 stops moving and moves in the opposite direction, the straight rack 5 moves in the opposite direction to drive the driven gear 7 to rotate in the opposite direction, the driven gear 7 reversely rotates to drive the limiting piece 6 to reversely rotate along with the driven gear, the pressure of the pressing block 18 disappears, the spring 15 is compressed to enable the limiting plate 17 to rebound in the direction far away from the spring 15, so that the limiting plate 17 drives the pressing block 18 to move along the moving rod 14 in the direction far away from the spring 15, the next use is facilitated, the limiting piece 6 reversely and correspondingly approaches the adjacent pressing block 18, and the movement range of the pneumatic actuator can be limited by cyclic reciprocation.

To sum up, this pneumatic actuator with limit valve through setting up positive reverse motor 8, two-way lead screw 11, slide bar 9 and slider 10, can adjust spacing distance, and when positive reverse motor 8 does not drive, the displacement can not take place for the push plate to ensure spacing distance's accuracy, through setting up pressure sensor 16, spring 15 and push block 18, can carry out real-time restriction to pneumatic actuator's range of motion, convenient follow-up use.

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

Claims

1. Pneumatic actuator with limit valve, including valve main part (3), its characterized in that: the pneumatic valve is characterized in that the valve body (3) is provided with a pneumatic actuator body (1), a motor box (2) is fixedly installed at the positions, close to the center, of the left side and the right side of the front side of the pneumatic actuator body (1), a positive reversing motor (8) is fixedly installed at the inner bottom wall of the motor box (2), a bidirectional screw (11) is fixedly connected to the output end of the positive reversing motor (8), a sliding block (10) is fixedly connected to the two output ends of the positive reversing motor (8), two sliding blocks (10) are fixedly connected to the two output ends of the bidirectional screw (11), one ends, close to the center, of the two positive reversing motors (8) are movably connected to bearing seats (12) of the two bidirectional screw (11), straight racks (5) are symmetrically arranged in the pneumatic actuator body (1), a driven gear (7) is arranged in the pneumatic actuator body, a limiting piece (6) is fixedly connected to the top of the driven gear (7), and sliding rods (9) are fixedly installed at the positions, close to the center, close to the left side and the right side of the inner front side of the pneumatic actuator body (1).

2. A pneumatic actuator with a limit valve as defined in claim 1, wherein: the utility model provides a plurality of slider (10) have four, and the front center department of four slider (10) is close to the front and back both ends of top respectively with two bi-directional lead screws (11) pass through lead screw threaded connection, two liang symmetries mounting groove (13) have all been seted up to the front end or the rear end of slider (10), a plurality of in mounting groove (13) be close to four corners of front and back both ends wall and all fixed mounting have movable rod (14), a plurality of movable rod (14) four group distribution in the inside of a plurality of mounting groove (13) and respectively with the front and back both ends wall fixed connection of a plurality of mounting groove (13), a plurality of equal fixed mounting in the inner center department of mounting groove (13) have pressure sensor (16), a plurality of the inner near center department's of mounting groove (13) position is all fixed mounting has spring (15), a plurality of spring (15) are kept away from the one end of mounting groove (13) and are all fixedly connected with limiting plate (17), a plurality of limiting plate (17) are kept away from the one end of a plurality of spring (15) respectively and are pressed down in a plurality of movable block (18) and are cup jointed respectively.

3. A pneumatic actuator with a limit valve as defined in claim 2, wherein: the pressure sensors (16) are respectively arranged in the springs (15) and are movably sleeved with the springs (15).

4. A pneumatic actuator with a limit valve as defined in claim 2, wherein: one end of a sliding rod (9) in the installation groove (13) penetrates through a plurality of limiting plates (17) close to the sliding rod, and the sliding rod (9) is movably sleeved with the limiting plates (17) near the sliding rod.

5. A pneumatic actuator with a limit valve as defined in claim 1, wherein: one end of the two-way screw rods (11) far away from the bearing seat (12) penetrates through the front end wall inside the pneumatic actuator main body (1) and the two motor boxes (2) respectively and is connected with the two forward and backward rotating motors (8) respectively, the two-way screw rods (11) are movably connected with the motor boxes (2) and the connecting part of the pneumatic actuator main body (1) respectively, and a sealing ring is arranged at the connecting part of the two-way screw rods (11) and the pneumatic actuator main body (1).

6. A pneumatic actuator with a limit valve as defined in claim 2, wherein: adjacent ends of the symmetrical pressing blocks (18) are respectively close to adjacent limiting pieces (6).

7. A pneumatic actuator with a limit valve as defined in claim 1, wherein: one ends of the two bearing seats (12) which are far away from the two bidirectional screw rods (11) are fixedly connected with the left side and the right side of the inner rear end wall of the pneumatic actuator main body (1) close to the center respectively.

8. A pneumatic actuator with a limit valve as defined in claim 1, wherein: the driven gears (7) are respectively meshed with the two straight racks (5).