KR101000899B1 - A air pressure cicuit - Google Patents

Abstract

PURPOSE: A vertical motion-type acceleration/deceleration pneumatic circuit is provided to reduce noise and damage of heavy equipment and the failure rate of products manufactured by the heavy equipment by providing a decelerating area where the reciprocating speed of an air cylinder is reduced. CONSTITUTION: A vertical motion-type acceleration/deceleration pneumatic circuit comprises a compressed air injection line(10), a main changeover valve(20), a pilot check valve(30), a detection sensor part(40), a frontward exhaust line part(50), a first sub changeover valve(60), a rearward exhaust line part(70), and a second sub changeover valve(80). The compressed air injection line is composed of first to third injection lines for injecting compressed air from a compressed air generating part(P). The main changeover valve is installed between the compressed air injection line and first and second injection lines(1,2). The pilot check valve is installed in the first and second lines between an air cylinder(S) and the main changeover valve. The detection sensor part is installed in the action radius of a rod(L) of the air cylinder. The frontward exhaust line part is installed in the main changeover valve. The first sub changeover valve is operated according to the sensing of the detection sensor part. The rearward exhaust line part is installed in the main changeover valve. The second sub changeover valve is operated according to the sensing of the detection sensor part.

Description

Vertical air acceleration / deceleration pneumatic circuit with safety device {A air pressure cicuit}

The present invention relates to a vertical operation acceleration and deceleration pneumatic circuit equipped with a safety device, and more particularly, by applying a safety system for stopping the operation of the air cylinder in the event of an emergency, such as power outage or air is turned off at the line side. In case of sudden pressure drop of the circuit, the air pressure is maintained at the set pressure to not affect the heavy load equipment, and the safety accident can be prevented in advance, and the separate speed control means allows the air cylinder to move forward and backward. The present invention relates to a vertical operation acceleration / deceleration pneumatic circuit equipped with a safety device capable of reducing the noise and damage caused by the impact of high load equipment and the failure rate of a product manufactured by the high load equipment by reducing the speed.

In general, high load equipment that moves up and down vertically uses a drive shaft that moves up and down by driving force.

However, since such high load equipment has a high speed to the end point of movement when the drive shaft moves up or down, noise is generated due to a large impact, and the damage of the device and the product to be manufactured or aligned frequently occur. Therefore, it was necessary to reduce the speed of descending and descending, and it was necessary to prevent the safety accident by fixing the high-load equipment moving up and down in the emergency situation including the power outage in that position.

Therefore, conventionally, the servo motor has been mainly used to arbitrarily adjust the ascending speed and operation of the drive shaft, but the servo motor has a disadvantage of being expensive.

Meanwhile, in the conventional pneumatic circuit, as shown in FIG. 1, the drive shaft 117, the cylinder 110 connected to be installed to operate the drive shaft 117, and the cylinder 110 may be moved up and down. It is composed of a solenoid valve 115 is installed, and a speed controller 118 is installed to reduce the flow of air in the cylinder 110 to reduce the rising speed of the drive shaft 117, the cylinder 110 is a cylinder First and second sensors 111 and 112 are mounted to sense rising and falling of the 110.

Hereinafter, the operation of the conventional pneumatic circuit will be described.

When the external power is applied to the solenoid valve 115 to operate the air flows into the port D, the air flows into the cylinder 110 through the port A, and the cylinder 110 descends.

As described above, as the cylinder 110 descends, air inside the cylinder 110 exits through the port B, and the driving shaft 117 descends at the normal speed.

When the solenoid valve 115 is off, air flows into the port C and flows into the cylinder 110 through the port B. Therefore, the air in the cylinder 110 is lifted out through the port A by raising the cylinder 110.

The speed-out controller 118 of the meta-out method is connected to the port A to reduce the amount of air flowing out, thereby reducing the ascending speed of the drive shaft 117.

However, since the conventional pneumatic circuit maintains the reduced speed from the beginning to the end when the drive shaft 117 rises, there is a problem in that the time loss is large when applied to a system requiring a high speed function. Complementary measures have been required.

In addition, the use of such a conventional pneumatic circuit can not achieve the maintenance of the position of the high-load equipment was not improved at all the problem vulnerable to safety accidents.

As a result, it is necessary to develop a pneumatic circuit having high safety as well as improving the speed of elevating and lowering unnecessary parts.

The present invention has been invented to solve the above problems, by applying a safety system for stopping the operation of the air cylinder in the event of an emergency, such as power outage or the line is turned off to the pneumatic pressure drop even in the sudden pressure drop of the pneumatic circuit Not only does not affect the heavy load equipment by maintaining the set pressure, but also prevents accidents in advance, and has a deceleration section to reduce the forward and reverse speed of the air cylinder through a separate speed control means. Therefore, it is an object of the present invention to provide a vertical operation acceleration and deceleration pneumatic circuit equipped with a safety device that can reduce the noise and damage caused by the impact of high-load equipment and the failure rate of the product manufactured by the high-load equipment.

The vertical operation acceleration and deceleration pneumatic circuit equipped with a stabilizer of the present invention for achieving the above object comprises a compressed air injection line consisting of first, second, third injection lines for injecting compressed air from the compressed air generating unit; A closed center type 3 position 4 port main direction switching valve installed between the compressed air injection line and the first and second lines and operative to move the air cylinder rod forward, backward or stop according to a given input value; Installed in the first and second lines between the main direction switching valve and the air cylinder, the pilot to maintain a stable air pressure at the set pressure even in the case of sudden pressure drop so that the rod position of the air cylinder does not change when the compressed air is not supplied Check valve; A sensing sensor unit installed at a moving radius of the rod of the air cylinder; A first exhaust line installed in the main direction switching valve and configured to flow compressed air exhausted through the second line to the outside according to the forward operation of the rod configured in the air cylinder, and a third injection line branched from the first exhaust line It consists of a first exhaust branch line which is connected to the first exhaust line, the first exhaust line is provided with a check valve for the compressed air flows only in the forward exhaust direction, the first exhaust branch line to reduce the exhaust speed of the compressed air A forward speed exhaust line unit having a first speed control valve to be provided, and a check valve for allowing the compressed air to flow only in the forward exhaust direction; Operated in accordance with the detection of the sensor unit, and installed to be connected to the forward exhaust line and the third injection line, the direction of the compressed air supplied through the third injection line, and the direction of the compressed air exhausted through the forward exhaust line unit A two-position four-port first auxiliary directional valve for switching; A second exhaust line installed in the main direction switching valve and flowing compressed air exhausted through the first line to the outside according to the reverse operation of the rod of the air cylinder; and branched from the second exhaust line to the second injection line. It consists of a second exhaust branch line is connected to the installation, the second exhaust line is provided with a check valve for flowing compressed air only in the reverse exhaust direction, the second exhaust branch line to reduce the exhaust speed of the compressed air A reverse exhaust line unit having a second speed control valve and a check valve for allowing the compressed air to flow only in the reverse exhaust direction; Operated according to the detection of the sensor unit, and is installed to be connected to the reverse exhaust line and the second injection line to switch the direction of the compressed air supplied through the second injection line, the exhaust air exhausted through the reverse exhaust line It is characterized in that consisting of; 2 position 4 port second auxiliary directional valve.

The up / down operation acceleration / deceleration pneumatic circuit equipped with the safety device of the present invention applies a safety system that stops the operation of the air cylinder in the event of an emergency such as a power failure or air is turned off on the line side, even in the case of sudden pressure drop in the pneumatic circuit. By maintaining the pneumatic pressure at the set pressure not only does not affect the heavy load equipment, but also prevents safety accidents in advance, and a separate speed control means to reduce the forward and reverse speed of the air cylinder It is a useful invention that can reduce the failure rate of noise and damage caused by the impact of high-load equipment and products produced by the high-load equipment.

1 is a state diagram showing a conventional pneumatic circuit.
Figure 2 is a high speed forward motion state diagram of the rod of the present invention.
3 is a state diagram in which the second sensor of the present invention detects the rod and decelerates and moves forward.
4 is a state in which the first movement of the first sensor of the present invention detects the rod and the forward movement is completed.
5 is a high speed backward movement state diagram of the rod of the present invention.
6 is a state diagram in which the third sensor of the present invention detects the rod and decelerates backward movement.
Figure 7 is a state in which the backward movement is completed by detecting the load of the fourth sensor of the present invention.
8 is a state in which the main direction switching valve of the present invention is located in the neutral state, the operation of the air cylinder is stopped.

Hereinafter, the structure of the present invention will be described.

The vertical actuation acceleration / deceleration pneumatic circuit equipped with the safety device of the present invention is provided with compressed air supplied from the compressed air generating unit through first and second lines (1, 2) installed in the direction switching valve as shown in FIG. The present invention relates to a pneumatic circuit which is injected into the front or rear side of the air cylinder S to operate the rod L of the air cylinder S before and after, and includes a compressed air injection line 10 and a main direction switching valve 20. ), The pilot check valve 30, the detection sensor unit 40, the forward exhaust line unit 50, the first auxiliary direction switching valve 60, the reverse exhaust line unit 70, the second It consists of an auxiliary direction switching valve (80).

First, the compressed air injection line 10 is an injection line for supplying the compressed air supplied from the compressed air generating unit P in the direction of the main direction switching valve 20, and the first, second, third injection lines 11, 12 , 13) is characterized by being branched.

In addition, the main direction switching valve 20 is installed between the compressed air injection line 10 and the first and second lines (1, 2), the air cylinder according to the input value given through the control unit (not shown) The rod L of (S) is moved forward and backward, or the rod L of the air cylinder S is stopped.

Here, the main direction switching valve 20 can be easily achieved by using a three-position four-port direction switching valve commonly used, the main direction switching valve in the event of an emergency, such as power failure or sudden air block It is preferable to prevent the position of the rod L position of the air cylinder S when the air supply is not made by automatically moving the 20 to the neutral position.

In addition, the pilot check valve 30 is installed in the first and second lines 1 and 2 between the main direction switching valve 20 and the air cylinder S, and has a high load even in the sudden pressure drop of the pneumatic circuit. The equipment (not shown) is configured to maintain the pneumatic pressure at a set pressure without affecting.

Therefore, when compressed air is not supplied in the direction of the air cylinder S according to an emergency occurrence such as a power failure or air is turned off on the line side, the position of the rod L of the air cylinder S stops stably without change. This action is performed by a check valve (C) configured inside the pilot check valve (30).

In addition, the detection sensor unit 40 is installed in the moving radius of the rod configured in the air cylinder, before the moving radius of the rod (L), the first and fourth sensors (41, 44) installed at the rear end, Deceleration section at the end of the direction in which the rod (L) of the air cylinder (S) proceeds consists of the second, third sensors 42, 43 installed adjacent to the first, fourth sensors (41, 44), respectively It is desirable to have a.

In addition, the configuration of the first, second, third, and fourth sensors 41, 42, 43, and 44 may designate a section speed by setting for each sensor.

For example, when the air cylinder S is advanced, a high speed section between the fourth sensor 44 and the second sensor 42 section, the second sensor 42 and the first sensor section section In order to have a deceleration section therebetween, the high speed section between the first sensor 41 and the third sensor section 43 when the air cylinder S is retracted, the third sensor 43 and the fourth sensor 44. It is to have a deceleration section between sections.

Alternatively, the interval between the second sensor 42 and the third sensor 43 when the forward and backward of the air cylinder (S) is set to the high-speed section, the first sensor 41 and the second sensor 42 ) Section and the third sensor 43 and the fourth sensor 44 section is set to the deceleration section, it may be achieved simply.

In addition, although the positions of the second and third sensors 42 and 43 are described to be installed adjacent to the first sensor 41 and the fourth sensor 44, respectively, the second and third sensors 42 and 43 are described. The position setting of is described as a preferred installation position for improving the lifting speed of the unnecessary portion is not limited to this, the first, second, third, four sensors (41, 42, 43, 44) can be installed at equal intervals. It may be installed in various locations such as.

In addition, the deceleration of the rod L movement speed of the air cylinder S by the detection sensor unit 40 is controlled according to the detection of the first, second, third, and fourth sensors 41, 42, 43, and 44. By the first and second auxiliary direction switching valves 60 and 80 that are automatically operated by the first and second auxiliary direction switching valves 60 and 80 and the forward and backward exhaust line parts 50 and 70 connected by the first and second auxiliary direction switching valves 60 and 80, respectively. Will be achieved, the description thereof will be described later.

In addition, the first and second lines (1, 2) formed between the main direction switching valve 20 and the air cylinder (S) has a normal speed control valve (3) for primarily reducing the moving speed of the compressed air Each of the speed control valve 3 may be installed, and thus the detailed description thereof is omitted since it is a known conventional configuration that prevents the rod L of the air cylinder S from moving too fast.

In addition, the forward exhaust line unit 50 is installed in the main direction switching valve 20 as a line for flowing out the compressed air exhausted in accordance with the forward operation of the rod (L) configured in the air cylinder (S), A first exhaust line 51 for flowing compressed air exhausted through the second line 2 to the outside, and a first branch branched from the first exhaust line 51 and connected to the third injection line 13. The exhaust branch line 52 is comprised.

In addition, the compressed air supplied from the compressed air generating unit P is not supplied to the second line 2 through the first exhaust line 51 in the first exhaust line 51 so that the compressed air is in the forward exhaust direction. It is characterized in that the check valve (C) to flow only to the first exhaust branch line 52, the first speed control valve 53 for reducing the exhaust speed of the compressed air and the compressed air generating unit ( P) to prevent the compressed air supplied from the rotor to be supplied to the second line 2 through the first exhaust branch line 52 so that the compressed air exhausted through the second line 2 flows only in the forward exhaust direction. The check valve C is provided.

In addition, the first speed control valve 53 used here can be simply achieved by using a conventional orifice valve.

In addition, the first auxiliary direction switching valve 60 is automatically operated by the control unit according to the detection of the detection sensor unit 40, so as to be connected to the forward exhaust line unit 50 and the third injection line (13). The first auxiliary direction switching valve 60 is installed in the first exhaust line 51 or the first exhaust line 51 of the forward exhaust line part 50 by changing the direction of the compressed air supplied through the third injection line 13. Simultaneously with the first exhaust line 52, the compressed air exhausted from the second line 2 is exhausted to the outside through the first exhaust line 51 or the first exhaust branch line 52.

Here, the first auxiliary direction switching valve 60 can easily achieve this configuration by using a commonly used two-position four-port direction switching valve.

In addition, the reverse exhaust line unit 70 is installed in the main direction switching valve 20 is a line for flowing out the compressed air exhausted in accordance with the reverse operation of the rod (L) of the air cylinder (S), the first A second exhaust line 71 for flowing compressed air exhausted through the first line 1 to the outside, and a second exhaust line branched from the second exhaust line 71 and connected to the second injection line 12; It consists of a branch line 72.

Further, the compressed air supplied from the compressed air generating unit P is not supplied to the first line 1 through the second exhaust line 71 in the second exhaust line 71 so that the compressed air is in the backward exhaust direction. It is characterized in that the check valve (C) is installed to flow only to the second exhaust branch line 72, the second speed control valve 73 for reducing the exhaust speed of the compressed air and the compressed air generator ( The compressed air supplied from P) is not supplied to the first line 1 through the second exhaust branch line 72 so that the compressed air exhausted through the first line 1 flows only in the reverse exhaust direction. The check valve C is provided.

In addition, the second speed control valve 73 used here can be achieved simply by using a conventional orifice valve like the first speed control valve 53.

In addition, the second auxiliary direction switching valve 80 is automatically operated by the control unit according to the detection of the detection sensor unit 40, so as to be connected to the reverse exhaust line unit 70 and the second injection line 12. The second auxiliary direction switching valve 80 is installed in the second exhaust line 71 or the second exhaust line line 70 of the reverse exhaust line unit 70 by changing the direction of the compressed air supplied through the second injection line 12. Simultaneously with the second exhaust branch line 72, the compressed air exhausted from the first line 1 is exhausted to the outside through the second exhaust line 71 or the second exhaust branch line 72.

Here, the second auxiliary direction switching valve 80 may be easily achieved by using a two-position four-port direction switching valve that is commonly used similarly to the first auxiliary direction switching valve 60.

Hereinafter will be described the operation according to an embodiment of the present invention made of the above configuration.

First, as shown in FIGS. 3 to 4, in a state in which the rod L configured in the air cylinder S is located at the fourth sensor 44 of the detection sensor unit 40, as shown in FIG. 2. An operation in which L moves forward is described. Here, the section between the fourth sensor 44 and the second sensor 42 is a high speed section, and between the second sensor 42 and the first sensor 41. The section will be described as being limited to the deceleration section.

As shown in FIG. 2, when the main direction switching valve 20 is operated by the control of the controller while the compressed air generating unit P is operated, the main direction switching valve 20 operates to the left to inject compressed air. The first injection line 11 of the line 10 and the first line 1 are connected to each other. Then, the compressed air supplied to the first injection line 11 is introduced into the first line 1 through the main direction switching valve 20, and the compressed air is the speed control valve 3 and the pilot check valve. After passing through (30) is introduced into the rear of the air cylinder (S) to advance the rod (L).

As the rod L moves forward in this way, the compressed air in front of the rod L is exhausted through the second line 2, where the compressed air for operating the pilot check valve 30 is operated in a first manner. Ignored by the hydraulic pressure supplied through the line (1), that is, when the pilot check valve (30) is about to be operated, the compressed air is not supplied to the rear of the air cylinder (S) through the first line (1). Compressed air is evacuated while the pressure of the compressed air directed to the pilot check valve 30 through line 2 is ignored.

Accordingly, the compressed air exhausted through the second line 2 passes through the speed control valve 3, and then passes through the passage of the main direction control valve 20 to the first exhaust line 51 of the forward exhaust line part 50. ) And the first exhaust branch line 52.

Meanwhile, the compressed air supplied through the compressed air generating unit P is supplied through second and third injection lines 12 and 13 in addition to the first injection line 11 of the compressed air injection line 10. In addition, the compressed air supplied through the third injection line 13 is supplied only to the check valve C configured in the first exhaust branch line 52 through the first auxiliary direction switching valve 60.

Therefore, the compressed air exhausted to the first exhaust branch line 52 is not exhausted, and all the compressed air is exhausted through the first auxiliary direction switching valve 60 via the first exhaust line 51. Compressed air is exhausted because it does not pass through the first speed control valve 53 is a high-speed exhaust, high speed forward movement of the air cylinder (S) is possible according to the high load that is operated in accordance with the operation of the air cylinder (S) The machine will descend quickly.

In addition, when such an operation occurs continuously and the rod L is positioned to the position where the second sensor 42 is located, as shown in FIG. 3, the air cylinder S enters the deceleration section and the rod L. The forward speed will decrease.

In more detail, when the rod L configured in the air cylinder S is adjacent to the second sensor 42 and the second sensor 42 detects the rod L, the control unit controls the rod L. FIG. The first auxiliary direction switching valve 60 is moved to the right.

Then, the supply direction of the compressed air of the third injection line 13 is switched by the first auxiliary direction switching valve 60 is supplied to the first exhaust line 51, whereby the compressed air is the first exhaust line It is supplied to the place where the check valve C comprised by 51 is located.

Therefore, the compressed air exhausted to the first exhaust line 51 is not exhausted, and all the compressed air is exhausted through the first auxiliary return switching valve 60 via the first exhaust branch line 52. Since the compressed air passes through the first speed control valve 53 configured in the first exhaust branch line 52, the exhaust air is decelerated and exhausted. As a result, the decelerated forward motion of the air cylinder S takes place, The heavy load equipment that operates in accordance with the operation slows down slowly.

And, this action occurs until the rod (L) is fully advanced and sensed by the first sensor 41, as shown in Figure 4, according to the impact and noise generated when the high load equipment is hit by falling At the same time, it is possible to prevent breakage of high load equipment and damage to a product to be manufactured through high load equipment.

 In addition, when the first sensor 41 detects the rod L, the first auxiliary direction switching valve 60, which was automatically operated by the controller, automatically returns to its original position and becomes the initial state, and at the same time, the main direction switching valve. The position of 20 is automatically returned to the original position, neutral, and the forward movement of the rod L is completed.

Next, as shown in FIGS. 6 to 7 in a state in which the rod L configured in the air cylinder S is located at the first sensor 41 of the sensor 40 as shown in FIG. 5. An operation in which the rod L moves backward will be described. Here, the section between the first sensor 41 and the third sensor 43 is a high speed section, and between the third sensor 43 and the fourth sensor 44. Will be described as being limited to the deceleration section.

As shown in FIG. 5, when the main direction switching valve 20 is operated by the control of the controller while the compressed air generating unit P is operated, the main direction switching valve 20 operates to the right to inject compressed air. The first injection line 11 and the second line 2 of the line 10 are connected to each other. Then, the compressed air supplied to the first injection line 11 is introduced into the second line 2 through the main direction switching valve 20, and the compressed air passes through the speed control valve 3, The pilot check valve 30 is pushed to the right to operate and at the same time flows in front of the air cylinder (S) to reverse the rod (L).

When the rod L moves backward as described above, after the compressed air at the rear of the rod L is exhausted through the first line 1 and passes through the pilot check valve 30 and the speed control valve C, The exhaust gas is exhausted to the second exhaust line 71 and the second exhaust branch line 72 of the reverse exhaust line part 50 through the passage of the main direction control valve 20.

Meanwhile, the compressed air supplied through the compressed air generating unit P is supplied through second and third injection lines 12 and 13 in addition to the first injection line 11 of the compressed air injection line 10. In addition, the compressed air supplied through the second injection line 12 is supplied only to the check valve C configured in the second exhaust branch line 72 through the second auxiliary direction switching valve 80.

Therefore, the compressed air exhausted to the second exhaust branch line 72 is not exhausted, and all the compressed air is exhausted through the second auxiliary direction switching valve 80 through the second exhaust line 71. Since the compressed air is exhausted without passing through the second speed control valve 73, the exhaust air is discharged at high speed. Accordingly, the high speed reverse movement of the air cylinder S is possible, and the high load is operated according to the operation of the air cylinder S. The equipment will rise at high speed.

In addition, when such an operation occurs continuously and the rod L is positioned to the position where the third sensor 43 is located as shown in FIG. 6, the air cylinder S enters the deceleration section and the rod L The reverse speed of the motor will slow down.

In more detail, when the rod L configured in the air cylinder S is adjacent to the third sensor 43, and the third sensor 43 detects the rod L, the controller controls the control unit. The second auxiliary direction switching valve 80 is moved to the right.

Then, the supply direction of the compressed air of the second injection line 12 is switched by the second auxiliary direction switching valve 80 is supplied to the second exhaust line 71, whereby the compressed air is the second exhaust line It is supplied to the place where the check valve C comprised in 71 is located.

Therefore, the compressed air exhausted to the second exhaust line 71 is not exhausted, and all the compressed air is exhausted through the second auxiliary return switching valve 80 via the second exhaust branch line 72. Since the compressed air passes through the second speed control valve 73 formed in the second exhaust branch line 72, the gas is decelerated and exhausted. As a result, the deceleration backward movement of the air cylinder S occurs, thereby The heavy load equipment operating in accordance with the operation slows down slowly.

And, as shown in Figure 7 occurs until the rod (L) is fully reversed and detected by the fourth sensor 44, the impact and noise generated when the high load equipment is hit by falling At the same time as this is reduced, breakage of high load equipment is prevented.

 In addition, when the fourth sensor 44 detects the rod L, the second auxiliary direction switching valve 80, which was automatically operated by the controller, automatically returns to its original position and becomes the initial state, and at the same time, the main direction switching valve. The position of 20 is automatically returned to the original position, neutral, and the backward movement of the rod L is completed.

Hereinafter, as shown in FIG. 8, when the rod L of the air cylinder S moves forward or backward, the operation of the air cylinder S in the event of an emergency such as a power failure or air is turned off on the line side is performed. The operation to stop will be described.

As shown in FIG. 3 or FIG. 6, when an emergency occurs while the rod L of the air cylinder S moves forward or backward, the main direction switching valve 20 is controlled by automatic control of the controller as shown in FIG. 8. Will be neutral.

Then, not only the compressed air is not injected into the air cylinder S, but also the compressed air supplied to the front and rear of the air cylinder S cannot be discharged to the outside, so that the rod L of the air cylinder S ) Will stop at that position, thereby stopping the operation of the high-load equipment that interlocks according to the operation of the air cylinder (S).

In addition, when the operation of the air cylinder S is stopped as described above, the pilot check valve 30 is fixed to the left to maintain the pneumatic pressure at the set pressure so as not to affect the high load equipment even in a sudden pressure drop of the pneumatic circuit. Because of the action it is possible to maintain a stable position of the high-load equipment, thereby preventing the safety accidents caused by falling of the high-load equipment.

In addition, the operation can be manually controlled by the user directly operating the control unit, the operator can work in a safer environment.

As described above, when using the up-down operation acceleration / deceleration pneumatic circuit equipped with the safety device of the present invention, the air pressure is set even in the sudden pressure drop of the pneumatic circuit by applying a safety system for stopping the operation of the air cylinder (S). Not only does not affect the heavy load equipment by maintaining the pressure, but also prevents accidents in advance, and has a deceleration section for reducing the forward and reverse speed of the air cylinder (S) impact of heavy load equipment Noise and damage caused by the product and the failure rate of the product manufactured by the high-load equipment can be reduced.

C: Check Valve L: Rod
P: Compressed air generating part S: Air cylinder
1, 2: 1st, 2nd line 3: speed control valve
10: injection line 11, 12, 13: 1, 2, 3 injection line
20: main direction switching valve 30: pilot check valve
40: sensor 41, 42, 43, 44: the first, second, third, fourth sensor
50: forward exhaust line part 51: the first exhaust line
52: first exhaust branch line 53: first speed control valve
60: first auxiliary direction switching valve 70: reverse exhaust line
71: second exhaust line 72: second exhaust branch line
73: second speed control valve 80: second auxiliary direction switching valve

Claims (3)

In the pneumatic circuit for injecting the compressed air supplied from the compressed air generating unit to the front or rear side of the air cylinder through the first and second lines connected to the direction switching valve to operate the rod of the air cylinder before and after,
A compressed air injection line 10 including first, second and third injection lines 11, 12 and 13 for injecting compressed air from the compressed air generator P;
It is connected between the compressed air injection line 10 and the first and second lines (1, 2) to operate to move the rod L of the air cylinder S forward, backward or stop according to a given input value. Closed center three-position four-port main direction switching valve (20);
Installed in the first and second lines (1, 2) between the main direction switching valve 20 and the air cylinder (S), even in the case of a sudden pressure drop to maintain a stable pneumatic pressure at a set pressure when not supplying compressed air A pilot check valve 30 for preventing the rod L position of the air cylinder S from varying;
A detection sensor unit 40 installed at a moving radius of the rod L of the air cylinder S;
The first exhaust line 51 installed in the main direction switching valve 20 to flow the compressed air exhausted through the second line (2) in accordance with the forward operation of the rod (L) configured in the air cylinder (S) to the outside (51) ) And a first exhaust branch line 52 branched from the first exhaust line 51 and connected to the third injection line 13, wherein the compressed air is advanced to the first exhaust line 51. A check valve (C) is provided to flow only in the exhaust direction, and the first exhaust branch line (52) includes a first speed control valve (53) for reducing the exhaust speed of the compressed air, and compressed air in the forward exhaust direction. A forward exhaust line unit 50 having a check valve C installed therein to flow only;
Operated in accordance with the detection of the sensor unit 40, it is installed to be connected to the forward exhaust line 50 and the third injection line 13 and the direction of the compressed air supplied through the third injection line (13) and A two-position four-port first auxiliary directional valve 60 for changing the direction of the compressed air exhausted through the forward exhaust line part 50;
The second exhaust line (71) installed in the main direction switching valve 20 for flowing the compressed air exhausted through the first line (1) in accordance with the backward operation of the rod (L) of the air cylinder (S) And a second exhaust branch line 72 branched from the second exhaust line 71 and connected to the second injection line 12, wherein the second exhaust line 71 has compressed air exhausted backward. A check valve (C) is provided to flow only in the direction, and the second exhaust branch line (72) has a second speed control valve (73) for reducing the exhaust speed of the compressed air, and the compressed air in the reverse exhaust direction. A reverse exhaust line unit 70 having a check valve C installed therein to flow only;
Compressed air, which is operated according to the detection of the sensing sensor unit 40, is installed to be connected to the reverse exhaust line unit 70 and the second injection line 12, and is supplied through the second injection line 12. Up and down actuation acceleration and deceleration pneumatic circuit with a safety device, characterized in that consisting of; 2-position 4-port second auxiliary direction switching valve (80) for switching the direction of the compressed air exhausted through the exhaust line (70).
The safety device according to claim 1, wherein the main direction switching valve 20 is automatically neutralized in case of power failure or air shutoff and emergency, thereby preventing the rod position of the air cylinder S from being changed. Up and down operating acceleration and deceleration pneumatic circuit.
According to claim 1, wherein the sensor 40 is the first, fourth sensors (41, 44) and the first, fourth sensors (41, 44) are installed at the rear end before the moving radius of the rod (L), Safety device characterized in that it comprises a second, third sensor 42, 43 installed adjacent to each other 44 to have a deceleration section at the end of the direction in which the rod (L) of the air cylinder (S) proceeds Up and down operating acceleration and deceleration pneumatic circuit.

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