KR20170122474A - The large pneumatic actuator having an operation control safety device - Google Patents

Abstract

The present invention relates to a large pneumatic actuator with an operation control safety device. A housing unit is provided with a safety device, and a solenoid valve through which air flows into a pneumatic cylinder unit by the safety device is controlled, thereby controlling the operation of the pneumatic actuator. As described above, the pneumatic actuator with an operation control safety device according to the present invention has an effect of preventing an accident from being caused by damage to the actuator. In addition, the pneumatic actuator has a simple structure which does not deviate from a basic structure of a large pneumatic actuator, has low risk of wear caused by high load, and has an effect of excellent durability and low maintenance costs. In addition, a torque switch is provided, and application and utilization for operation analysis of the actuator such as precise measurement for operation torque of the large pneumatic actuator are possible.

Description

[0001] The present invention relates to a large pneumatic actuator having an operation control safety device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized pneumatic valve actuator, and more particularly, to a large-sized pneumatic actuator having a safety device for operation control for controlling an operation of an actuator through power off of a solenoid valve according to driving of the pneumatic actuator.

The large pneumatic valve actuator 10 is responsible for controlling the opening and closing of valves for fluid and gas flow in large plants such as gas, petroleum, and water.

1 and 2, the large pneumatic valve actuator 10 is provided with a solenoid valve (not shown) operated according to a user's signal, and the solenoid valve 100 controls the pneumatic cylinder actuator 100, The air is introduced and exhausted.

The actuator 10 is operated by the pneumatic cylinder part 100 by the inflow and exhaust of the air, thereby opening and closing the valve. The valve 10 is advantageous in terms of low fuel consumption, high output, low failure rate due to simple structure, It is mainly used as a pipeline.

1 (A), when the air is introduced into the pneumatic cylinder part 100, the piston 110 is moved together with the compression of the low-speed spring 310 and the yoke The solenoid valve is shut off by the signal of the user when the valve is fully opened, so that the inflow of air is stopped and the operation of the actuator 10 is stopped Is stopped.

Referring to FIG. 1B, when the air in the pneumatic cylinder part 100 of the pneumatic valve actuator 10 is exhausted, the piston rod 120 and the piston 110 are moved by a pressure change, The piston 110 is moved at a high speed and under a high load as the compressed spring 310 is expanded by the restoring force.

In addition, the yoke 210 of the housing part 200 is rotated to interlock with the movement of the piston 110 to close the valve, and when the valve is completely closed, The exhaust is stopped with the cut-off and the operation of the actuator 10 is stopped.

In operation of the large pneumatic valve actuator 10 as described above, the user checks the signal displayed by the indicator (not shown) in conjunction with the rotation of the yoke 210, The operation of the actuator 10 is controlled.

However, since the piston 110 and the pneumatic cylinder part 100 collide with each other due to carelessness of the user or an abnormality of the actuator 10, an impact is applied to the actuator 10 to cause defects, breakage or durability deterioration. As there is a risk of major accidents in use, safety devices for speed control and shock prevention are essential.

Accordingly, a shock absorber or a shock absorber such as a stopper bolt or a spring damper for shock absorption or impact prevention is used. However, since the structural safety device of an actuator for preventing an accident from occurring is not currently commercialized, There is a growing demand for safety devices for motion control.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a solenoid valve which is capable of operating the actuator by interrupting the power supply to the solenoid valve, And an object of the present invention is to provide a large-sized pneumatic actuator provided with a safety device for operation control that can be controlled.

However, the object of the present invention is not limited to the above-mentioned object, and another object which is not mentioned can be understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a pneumatic cylinder comprising: a pneumatic cylinder portion having a piston and a piston rod driven by inflow and outflow of air; a yoke provided on one side of the pneumatic cylinder portion, And a spring portion provided at one side of the housing portion and applying a driving force to the housing portion, wherein the housing portion is provided with a safety device, and the safety device includes a pneumatic cylinder Wherein the operation of the pneumatic actuator is controlled by interrupting the power supply to the solenoid valve through which air is introduced into and exhausted from the solenoid valve.

The piston rod of the pneumatic cylinder part and the spring rod of the spring part are connected to the other side of the slide block and to one side of the slide block, Wherein the safety device is operated to close the solenoid valve to shut off air inflow and exhaust of the pneumatic cylinder part. The large pneumatic actuator is provided with a safety device for operation control.

The safety device includes a torque switch for transmitting a shutoff signal of the solenoid valve, a counter gear rod provided at an upper portion of the rod, a torque cam provided at one side of the counter gear, And a counter gear portion provided on the other side of the counter gear portion and rotating according to the driving of the piston rod.

The open cam and the close cam are spaced apart from each other by a predetermined angle. The open cam and the close cam are in contact with the contact of the torque switch, respectively, and the counter And the gear rod is rotated at a predetermined angle by the rotation of the counter gear portion. The large pneumatic actuator is provided with a safety device for operation control.

The large-pneumatic actuator is provided with a safety device for operation control, characterized in that the rotation of the counter gear rod causes the open cam and the close cam to rotate by a predetermined angle to come into contact with the contact of the torque switch.

The counter gear portion includes a primary gear meshed with a thread formed on the piston rod, a secondary gear provided on the same gear shaft as the primary gear, and a second gear meshed with the secondary gear, Wherein the primary gear is rotated according to the movement of the piston rod and the rotation force is transmitted to the tertiary gear to rotate the counter gear rod. One large pneumatic actuator is provided.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

As described above, according to the large-sized pneumatic actuator having the safety device for operation control according to the present invention, it is possible to prevent an accident caused by the damage of the actuator.

In addition, the structure is simple structure that does not deviate from the basic structure of the large-sized pneumatic actuator, and the durability is low and the maintenance cost is low as the risk of abrasion due to high load is small.

In addition, a torque switch is provided to enable application and use of motion analysis of actuators such as precise measurement of the operating torque of a large pneumatic actuator through additional sensor connection to an electric signal.

1 is an exemplary view showing a conventional actuator.
2 is a front view of a large pneumatic actuator having a safety device for operation control according to the present invention;
3 is a sectional view of a large-sized pneumatic actuator having a safety device for operation control according to the present invention.
4 is a sectional view of a housing part provided with a safety device for operation control according to the present invention;
5 is a perspective view of a safety device according to the present invention;
6 is a detailed view of the "A" portion of FIG. 2;
FIG. 7 is a detailed view of a portion "B" in FIG. 2;
8 is a sectional view showing a state in which a torque cam and a torque switch are operated according to the inflow of air into the actuator pneumatic cylinder unit according to the present invention.
9 is a sectional view showing a state in which the torque cam and the torque switch are operated according to the internal air exhaust of the actuator pneumatic cylinder unit according to the present invention.
10 is a sectional view of a pneumatic cylinder part, a speed control device, and a damper device of an actuator according to the present invention.
11 is an enlarged view of a damper device according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

FIG. 2 is a front view of a large pneumatic actuator having a safety device for operation control according to the present invention, FIG. 3 is a sectional view of a large-sized pneumatic actuator having a safety device for operation control according to the present invention, FIG. 5 is a perspective view of a safety device according to the present invention, FIG. 6 is a detailed view of the "A" portion of FIG. 2, and FIG. 7 is a detail view of the "B" And FIG. 9 is a cross-sectional view showing the torque cam and the torque cam according to the internal air exhaust of the actuator pneumatic cylinder unit according to the present invention. FIG. 8 is a cross-sectional view of the actuator pneumatic cylinder unit according to the present invention, 10 is a sectional view of a pneumatic cylinder portion, a speed control device, and a damper device of an actuator according to the present invention, and Fig. 11 is a cross- 1 is an enlarged view of a damper device according to the invention.

2, the pneumatic actuator 10 according to the present invention includes a pneumatic cylinder part 100, a housing part 200, and a spring part 300. As shown in FIG.

The pneumatic cylinder part 100 includes a piston 110 driven by the inflow and outflow of air as a power source and a piston rod 120 provided with the piston 110 therein.

The housing part 200 is provided at one side of the pneumatic cylinder part 100 and includes a yoke 210 which is operated according to the driving of the piston rod 120.

The spring unit 300 is installed at one side of the housing unit 200 and includes a spring 310 to apply a driving force to the housing unit 200. The spring unit 300 is coupled with the piston rod 120 A spring rod 320 is provided.

A speed control device 600 for controlling the moving speed of the housing part 200 and a damper device 500 for providing a damper function are provided on the other side of the pneumatic cylinder part 100.

Referring to FIGS. 3 and 4, a safety device 400 is provided in the housing part 200. The safety device 400 controls the operation of the pneumatic actuator 10 by controlling a solenoid valve (not shown) through which air flows into and exhausts from the pneumatic cylinder part 100.

A slide block 220 for operating the yoke 210 is provided in the housing part 200 and a piston rod of the pneumatic cylinder part 100 is connected to the other side of the slide block 220 120 and the spring rod 320 of the spring unit 300 are connected to each other.

The slide block 220 is tensioned by the plate spring 230 and the bearing 240 to one side of the piston rod 120 and operated in accordance with air inflow and outflow of the pneumatic cylinder part 100.

In addition, the safety device 400 operates according to the driving of the piston rod 210 to shut off the solenoid valve, thereby blocking air inflow and exhaust of the pneumatic cylinder part 210.

Accordingly, by stopping the operation of the piston rod 120, it is possible to prevent an accident caused by carelessness of the user, prevention of over-torque due to malfunction, or the like.

5 to 7, the safety device 400 includes a torque switch 440 for transmitting a shutoff signal of the solenoid valve, a counter gear rod 420 provided at an upper portion of the rods 120 and 320, A torque cam 430 provided on one side of the counter gear rod 420 and a counter gear disposed on the lower side of the rod 420 with the counter gear and rotated by the driving of the piston rod 120, (410).

Further, the torque switch 440 is preferably installed at a predetermined position of the housing part 200 so as to be in contact with the torque cam 430.

Also, the torque cam 430 is provided as an open cam 432 and a close cam 431. At this time, the open cam 432 and the close cam 431 are separated from each other by a predetermined angle, and the predetermined angle is 90 degrees.

The counter gear unit 420 is rotated at a predetermined angle by the rotation of the counter gear unit 410, and the predetermined angle is preferably 90 degrees.

Further, as the counter gear rod 420 rotates, the open cam 432 and the close cam 431 rotate by 90 degrees, which is a predetermined angle, to come into contact with the contact of the torque switch.

The counter gear unit 410 includes a primary gear 411, a secondary gear 412, and a tertiary gear 413.

The primary gear 411 is provided so as to engage with a thread 120a formed on the piston rod 120.

The secondary gear 412 is provided on the same gear shaft 414 as the primary gear 411. The tertiary gear 413 is engaged with the secondary gear 412, (420) so as to form the secondary gear (412) and the velvet gear shape.

Accordingly, the primary gear 411 is rotated in accordance with the movement of the piston rod 120, and the rotational force is transmitted to the tertiary gear 413 to rotate the counter gear rod 420.

The safety jig 400 configured as described above has a simple structure that can be installed without changing the basic structure of the actuator 10 and has a low durability due to a low risk of wear due to high load, There is an inexpensive effect.

Referring to FIG. 10, the speed control device 600 is provided with an air cylinder 610 that controls the speed of air through the pressure of the air.

The rod 620 of the air cylinder 610 is connected to the piston rod 120 of the driving cylinder part 100 and the air cylinder rod 620 is connected to the opposite end of the driving cylinder part 100 A piston 630 is formed.

At this time, the air cylinder rod 620 and the piston rod 120 are coupled through the bracket 130 and interlocked with each other when the piston rod 120 linearly reciprocates.

The piston 110 of the driving cylinder 100 moves at the same speed in accordance with the movement of the piston 630 of the air cylinder 610 to move the piston 110 of the piston 110 in accordance with the speed of the air cylinder piston 630. The moving speed is controlled.

Also, the speed control device 600 is operated only when the piston 110 moves in the direction of the housing part 200 or in a direction opposite to the direction.

Referring to FIGS. 10 and 11, the damper device 500 includes a pressure control damper 510, a check valve 530, and a pipe 520.

At this time, the pressure control damper 510 is provided at one side of the air cylinder 610 to control the air pressure inside the air cylinder 610.

The pipe 520 is connected to one side of the pressure control damper 510 and the inside of the air cylinder 610.

The check valve 530 is provided between the pressure control damper 510 and one side of the inside of the air cylinder 610 in the pipe 520 to supply air to one side of the air cylinder 610 do.

The pressure control damper 510 is configured to control the air pressure on one side of the air cylinder 610 to control the speed of the air cylinder piston 630.

The pressure control damper 510 controls the air pressure at one side of the air cylinder 610.

A pressure increase mode in which the air pressure is gradually increased by maintaining an off state in which the air is not exhausted and a pressure increase mode in which the air pressure is held constant by maintaining the on- Mode.

Therefore, the damper function is performed by the pressure increase mode and the speed control function is performed by the pressure equalization mode.

In addition, the pressure control damper 510 has a pressure regulating means 511 for determining an off state and an on state.

The pressure regulating means 511 includes a pressure regulating handle 512, a damper stopper 513, a damper spring 514, a damper rod 517, an exhaust passage 515 and an exhaust port 516 .

The damper stopper 513 can be vertically adjusted by the pressure adjusting handle 512. [

At this time, the damper spring 513 is provided below the damper stopper 513 to support the damper stopper 513, and the damper spring 514 is compressed by the damper stopper 513.

In addition, the pressure regulating means 511 is formed with an exhaust passage 515 through which air flowing through the pipe 520 moves.

And an exhaust port 516 connected to the exhaust passage 515 through which the air introduced through the pipe 520 is discharged.

At this time, the damper rod 517 is located in the exhaust passage 515 and is provided below the damper stopper 513 to open / close the exhaust passage 515.

The check valve 530 includes an intake port 531, an intake passage 532, an opening and closing member 533, a valve spring 534, and an intake pipe 535.

The intake port 531 is formed so that air is sucked from the outside and an intake passage 532 connected to the intake port 531 to move air sucked from the outside is connected to the intake pipe 535 .

The intake pipe 535 is connected to the pipe 520. The opening and closing member 533 is located in the intake passage 532 and opens and closes the intake passage 532 and is provided with a valve spring 534 which is compressed by the opening and closing member 533.

An embodiment of the pneumatic actuator 10 provided with the safety device 400 according to the present invention will be described in detail with reference to the above description.

Generally, the actuator 10 is opened and closed by driving the pneumatic cylinder part 100 by inflow and exhaust of air.

3 to 11, when air flows into the pneumatic cylinder part 100, the piston 110 is moved to the other side (left side in the drawing) along with the compression of the spring 310 at a low speed, The rotation axis of the yoke 210 rotates by 90 degrees, and the movement of the valve is also interlocked and opened.

At this time, the primary gear 411 and the secondary gear 412 of the counter gear unit 410 rotate in a direction opposite to the moving direction of the piston rod 120 as the piston rod 120 moves.

And the counter gear rod 420 is rotated counterclockwise by 90 degrees by the third gear 413 provided on the counter gear rod 420. As a result,

8, as the open cam 432 comes into contact with the contact of the torque switch 440, the solenoid valve is shut off so that the inflow of air into the pneumatic cylinder part 100 is blocked, The operation of the rod 120 is stopped.

That is, when the actuator 10 is fully opened, as the torque cam 430 rotates counterclockwise by 90 degrees, a contactor of the torque switch 440 is pressed to send a power shutoff signal of the solenoid valve, The sol valve is closed and the operation of the actuator 10 is stopped.

In addition, the air cylinder rod 620 coupled to the piston rod 120 through the bracket is moved to the other side according to the linear motion of the rods 120 and 320 as described above.

At this time, the air existing on the other side of the air cylinder 610 is exhausted through the exhaust port 640 formed on the other side of the air cylinder 610 with respect to the air cylinder piston 630.

Air is introduced into one side of the air cylinder 610 through the check valve 530 with respect to the air cylinder piston 630.

That is, as the piston 630 of the air cylinder 610 moves to the other side, the inner pressure of the one side of the air cylinder 610 is reduced (lower than the atmospheric pressure) on the basis of the air cylinder piston 630.

The external air is sucked through the intake port 531 of the check valve 530 by the pressure change of the one side of the air cylinder 610 and the opening and closing member 534 is opened by the pressure of the air sucked from the outside As the valve spring 534 is pushed down, the intake passage 532 is opened and air is introduced into one side of the air cylinder 610 through the pipe 520.

9, the air in the pneumatic cylinder part 100 is exhausted by a signal of the user when the valve of the actuator 10 is completely closed, whereby the piston rod 120 moves to one side, As the torque cam 430 rotates 90 degrees in the clockwise direction, a power cut-off signal of the solenoid valve is sent out by pressing the contact of the torque switch 440.

Then, the solenoid valve is closed and exhaust of the pneumatic cylinder part 100 is stopped, and the operation of the actuator 10 is stopped.

When the air is exhausted into the pneumatic cylinder part 100, the piston 110 and the piston rod 120 are moved to one side by a pressure change, and the compressed spring (interlocking with the piston rod 120) 310 are expanded by the restoring force, the piston 110 moves to a high speed and a high load.

In addition, the yoke 210 rotates in conjunction with the movement of the piston 110 to close the valve.

The air cylinder piston 630 interlocked with the piston rod 120 is moved to one side so that the air pressure increases from one side of the air cylinder 610 with respect to the air cylinder piston 630, ).

As the air pressure rises from one side of the air cylinder 610 with respect to the air cylinder piston 630, the high pressure air flows through the exhaust port (not shown) of the pressure control means 511 communicating with the pipe 520 516, respectively.

At this time, when the pressure of the high-pressure air flowing into the pipe 520 from the air cylinder 610 exceeds the compressive load of the damper spring 514, the damper rod 517 rises and flows into the exhaust passage 515 are opened to exhaust the high-pressure air.

As the high-pressure air is supplied from one side of the air cylinder 610 with respect to the air cylinder piston 630, the pressure reduction of the one side of the air cylinder 610 and the decelerating motion of the rods 120 and 320, At start-up, it is converted to constant-velocity motion.

The upper limit of the pressure inside the air cylinder 610 can be set according to the compression length of the damper spring 514 by changing the tightening position of the pressure adjusting handle 512 of the damper spring 514.

The exhaust timing of the air cylinder 610 is adjusted according to the set pressure upper limit value, and thus the speed of the rods 120 and 320 can be controlled through adjustment of the exhaust timing.

Accordingly, the speed control of the rods 120 and 320 is performed by the damper device 500 and the speed control device 600 through air pressure and exhaust operation control, and accordingly, the operation of the actuator 10 corresponding to the user's required time It is possible to prevent time and damage caused by collision between the piston 110 and the cylinder 100. [

The operation of the torque cam 430 and the torque switch 440 in response to the rotation of the counter gear 410 interlocked with the movement of the piston rod 120 during the operation of the pneumatic valve actuator 10 according to the present invention, And controls the operation of the actuator 10 by interrupting the inflow and outflow of air through the shutoff of the solenoid valve.

Accordingly, it is possible to prevent collision between the piston 110 and the pneumatic cylinder part 100 due to carelessness of the user and over-torque of the actuator 10, thereby preventing the actuator 10 from being damaged by the impact, There is an effect that the occurrence can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

10: actuator 100: pneumatic cylinder part
110: Piston 120: Piston rod
120a: screw thread 200: housing part
210: yoke 220: slide block
300: spring part 310: spring
320: spring load 400: safety device
410: Counter gear unit 411: Primary gear
412: Secondary gear 413: Third gear
414: Gear axis 420: Counter gear rod
430: torque cam 431: close cam
432: Open cam 440: Torque switch
500: damper device 510: pressure control damper
511: Pressure regulating means 512: Pressure regulating handle
513: Damper stopper 514: Damper spring
515: exhaust passage 516: exhaust port
517: Damper rod 520: Pipe
530: Check valve 531: Intake port
532: intake passage 533: opening / closing member
534: valve spring 535: intake pipe
600: speed control device 610: air cylinder
620: air cylinder rod 630: air cylinder piston
640: Air cylinder exhaust port

Claims (6)

A housing portion provided at one side of the pneumatic cylinder portion and provided with a yoke which is operated according to the driving of the piston rod, and a housing portion provided at one side of the pneumatic cylinder portion, And a spring portion provided on one side of the housing portion and applying a driving force to the housing portion, the large pneumatic actuator comprising:
The housing part is provided with a safety device,
Wherein the safety device controls the operation of the pneumatic actuator by interrupting the power supply to the solenoid valve through which the air flows into the pneumatic cylinder and is exhausted.
The method according to claim 1,
A piston rod of the pneumatic cylinder part and a spring rod of the spring part are connected to the other side of the slide block and one side of the slide block,
Wherein the safety device is operated by driving the piston rod to close the solenoid valve to shut off air inflow and exhaust of the pneumatic cylinder part.
3. The method of claim 2,
The safety device includes a torque switch for transmitting a shutoff signal of the solenoid valve;
A counter gear rod provided at an upper portion of the rod;
A torque cam provided on one side of the counter gear rod;
A counter gear portion provided on the other side of the rod with the counter gear and rotating according to the driving of the piston rod; And a safety device for operation control.
The method of claim 3,
The open cam and the closed cam are spaced apart from each other by a predetermined angle. The open cam and the closed cam are brought into contact with the contact of the torque switch, respectively,
Wherein the counter gear rod is rotated at a predetermined angle by rotation of the counter gear portion.
5. The method of claim 4,
And the open cam and the close cam are rotated by a predetermined angle by the rotation of the counter gear rod to contact the contact of the torque switch.
The method of claim 3,
The counter gear unit includes:
A primary gear meshed with a thread formed on the piston rod,
A secondary gear provided on the same gear shaft as the primary gear,
A third gear meshed with the second gear and provided on the counter gear,
Wherein the primary gear is rotated according to the movement of the piston rod, and the rotational force is transmitted to the tertiary gear to rotate the counter gear rod.

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