JPH04127403U - Pneumatic cylinder control device - Google Patents

Abstract

(57) [Summary] [Purpose] In a pneumatic cylinder control device that uses a pressurized air source for driving and control, it is possible to always maintain appropriate control air pressure and prevent instability of the pneumatic cylinder. It guarantees stable operation at all times without causing any malfunction or inoperable state, and makes it possible to further increase the pneumatic cylinder drive speed. [Configuration] Main passage ML from one pressurized air source 49
The primary pressure chambers 39, 3 of the left and right pneumatic control valves 20, 20a
9a, and a pilot passage PL on the downstream side of the main passage ML was connected to one port of each five-port valve 45, 45a. A pressure accumulation chamber 60 is provided in a branch path 80 to the main passage ML and the pilot passage PL, and a check valve 70 is provided on the side of the main passage ML.
Therefore, even if the air pressure decreases in the main passage ML, the air pressure on the pilot passage PL side is always maintained at an appropriate value.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a pneumatic cylinder control device, and in detail, it connects a pressurized air source and a main passage. The inside of the pneumatic control valve, which communicates with the pneumatic cylinder through the The switching valve body of the section is supplied by a pilot passage branching from this main passage. By switching control using pneumatic pressure as the driving source, the connection between the pneumatic control valve and the pneumatic cylinder is A pneumatic cylinder control device that switches the communication state of the pneumatic cylinder and controls the drive of the pneumatic cylinder. Regarding.

0002

[Conventional technology]

Conventionally, as described in Japanese Patent Application Laid-Open No. 2-154873, internal switching valve The body is controlled by pneumatic pressure, and the connected pneumatic cylinder can be moved forward at high speed, forward at low speed, or at high speed. Controls drive while switching speeds in four stages, including reverse or low-speed reverse, and forward and reverse. Pneumatic control valves that can It is used.

0003 An example of such a pneumatic cylinder drive system is shown in FIG. This pneumatic cylinder drive system has a rod-side cylinder chamber 14 and a head-side cylinder chamber. The drive is controlled by the supply/exhaust state through each supply/exhaust port 16, 17 of the conductor chamber 15. as a pneumatic cylinder 10 and a source of power pneumatic pressure to this pneumatic cylinder 10. The pressurized air source 49, the exhaust chambers 33, 33a communicating with the atmosphere, the pressurized air source 49 and the Supply and discharge of the primary pressure chambers 39, 39a and the pneumatic cylinder 10 that communicate via the in-path ML Secondary pressure chambers 38, 38a communicating with the air ports 16, 17; A first switching valve body 32, 32a and a primary pressure chamber 39, which communicate with the exhaust chambers 33, 33a, 39a and the secondary pressure chambers 38, 38a. Pneumatic control valves 20, 20a and a pilot passage PL branching from the main passage ML. Pneumatic control is achieved by switching the supply state of air pressure from the pressurized air source 49 supplied by the pressurized air source 49. The connection state of each switching valve body 40, 40a, 32, 32a of the control valve 20, 20a is duplicated. 5-port 2-position pneumatic switching solenoid valve (5-port 2-position pneumatic switching solenoid valve) that controls one of several control states. 45 and a 3-port 2-position pneumatic switching solenoid valve (3-port valve) 47, It operates to move the workpiece W back and forth.

0004 That is, the air pressure from the pressurized air source 49 is applied to the main passage ML, the primary pressure chamber 39 (39a ) is supplied to the pneumatic cylinder 10 and consumed for driving it, and its As a prerequisite, pilot passage PL, 5 port valve 45 (45a) or 3 port valve 47 (47a) to each second switching valve body 40 (40a) of the pneumatic control valve 20 (20a) , 32 (32a).

[0005] Further details of this conventional pneumatic cylinder drive system are available on request. Please refer to Japanese Patent Application No. 2-185908 filed by the present applicant.

[0006]

[Problem that the idea aims to solve]

By the way, in this pneumatic cylinder drive system, the drive of the piston rod 13 is When the moving speed is high, the supply of air pressure from the pressurized air source 49 may be insufficient. In such a case, both the main passage ML and the pilot passage PL should not be serviced. If the supply air pressure decreases and in extreme cases, the pressure regulating piston 2 in the air pressure control valve 20 (20a) 3 (23a) cannot be pushed up, and the first switching valve body 32 (32a) There is a possibility that it will not be possible to move it upward. For this reason, the pneumatic cylinder 10 is no longer able to perform exhaust through the pneumatic control valve 20 (20a) and becomes inoperable. It becomes.

[0007] Therefore, conventionally, pressurized air sources were used to drive pneumatic cylinders and to control pneumatic control valves. In the pneumatic cylinder control device that is commonly used for I couldn't speed it up.

[0008] Therefore, these pressurized air sources are used to drive pneumatic cylinders and to control pneumatic control valves. In the pneumatic cylinder control device shared by the This prevents the pneumatic cylinder from running out and allows stable driving of the pneumatic cylinder. This invention was completed with the aim of making it possible to further increase the drive speed.

[0009]

[Means and actions for solving the problem]

In order to achieve this purpose, the pneumatic cylinder control device of the present invention has the following features: It communicates with the pressurized air source through the main passage and the air supply and exhaust port of the pneumatic cylinder. The switching valve body inside the pneumatic control valve, which communicates with By switching and controlling the air pressure supplied by the lot passage as a driving source, the air pressure Switches the communication state between the control valve and the pneumatic cylinder and controls the drive of the pneumatic cylinder. In the pneumatic cylinder control device that operates, A pressure accumulation chamber is interposed in the pilot passage, and between the pressure accumulation chamber and the main passage, A check valve is installed to prevent backflow from the pilot passage side to the main passage side. It is characterized by.

0010 According to the pneumatic cylinder of the present invention, by providing a pressure accumulation chamber, the pilot passage side can always supply stable air pressure, and with a check valve, the main Since backflow to the aisle side is blocked, it is assumed that air pressure drops on the main aisle side. Even if the air pressure is on the pilot passage side, the air pressure will not drop. Therefore, the pneumatic control valve will be controlled stably at all times, and the pneumatic cylinder will be controlled at high speeds. No inoperability will occur.

[0011]

【Example】

Next, an embodiment to which the present invention is applied will be described based on the drawings. FIG. 1 shows the overall configuration of a pneumatic cylinder drive system according to a first embodiment of the present invention.

0012 This pneumatic cylinder drive system operates via a pressurized air source 49 and a main passage ML. An air supply and exhaust air supply and exhaust gas connected to the rod side cylinder chamber 14 of the pneumatic cylinder 10. First and second switching valve bodies 32 and 40 inside the pneumatic control valve 20 that also communicate with the port 16 is the air pressure supplied by the pilot passage PL branching from this main passage ML. By switching and controlling the pneumatic control valve 20 and the pneumatic cylinder 1 as a control power source, 0 and controls the drive of the pneumatic cylinder 10. The pressure accumulation chamber 60 is interposed in the pilot passage PL, and the pressure accumulation chamber 60 and the main Between the passage ML and the passage ML, prevent ventilation from the pilot passage PL side to the main passage ML side. It is characterized in that a check valve 70 is installed.

[0013] First, the structure of the pneumatic cylinder 10 will be explained. The pneumatic cylinder 10 has a piston 12 slidably housed in a casing 11. It is something. The piston rod 13 is connected to one end wall 11 of the casing 11. The work piece W is attached to the lower end of the work piece W, which is slidably passed through the hole a. Also, the rod The side cylinder chamber 14 and the head side cylinder chamber 15 are provided with air supply and exhaust ports 16 and 1, respectively. 7 is provided. Note that the air supply and exhaust port 16 of the rod side cylinder chamber 14 is Although it is in communication with the control valve 20, the supply and exhaust port 17 of the head side cylinder chamber 15 is connected to the control valve 20. It is said to be open to the atmosphere.

[0014] Next, the pneumatic control valve 20 will be explained. The pneumatic control valve 20 has a bottom wall 21b, and has a first partition wall 21c and a second partition wall 21 in the middle. The main body is a cylindrical casing 21 partitioned into three internal cavities by d and d. This first In the inner cavity above the first partition wall 21c, a hat-shaped balance piston 22 and a disc-shaped adjustment piston 22 are installed. The pressure pistons 23 are slidably and airtightly fitted to the inner wall of the casing 21, respectively. has been done. In order to prevent the balance piston 22 from jumping out, the casing is A top partition wall 21a of the cage 21 is formed, and there is a screw 3 with a hole in the center. 0 is screwed on. The balance piston 22 also slides into the center hole of this screw 30. They are movable and airtightly fitted.

[0015] In this way, the inner cavity above the first partition wall 21c is connected to the top partition wall 21a and the balance piston. An air supply chamber 24 formed between the balance piston 22 and the pressure regulating piston a balance chamber 25 formed between the pressure regulating piston 23 and the first partition wall 21; The pressure regulating chamber 26 is formed between the pressure regulating chamber 26 and the pressure regulating chamber 26 formed between the Note that the top partition wall 21a and A step 21e is formed on the inner wall of the casing 21 between the first partition wall 21c and the barrier wall 21c. The lance piston 22 is also prevented from descending any further.

[0016] The balance piston 22 also has a screw-type pressure regulating handle that can be operated from the outside. A dollar 27 is attached. Then, this pressure regulating handle 27 and the pressure regulating piston A pressure regulating spring 28 is interposed between the spring 23 and the pressure regulating spring 23 . On the other hand, the air supply chamber 24 has a port Air is supplied through 29.

[0017] The space between the first partition wall 21c and the second partition wall 21d is connected to the atmosphere through the port 34. It is an exhaust chamber 33 that is passed through. This is located at the center of the lower surface of the first partition wall 21c. A first valve chamber 31 consisting of a small diameter recess opening toward an exhaust chamber 33 is formed. Ru. A first switching valve body 32 is slidably fitted into the first valve chamber 31 . and, A compression spring 35 is disposed between the first switching valve body 32 and the first partition wall 21c. It is. The first switching valve body 32 is urged downward by this compression spring 35. , a sealing material is applied to the ring-shaped first valve seat 36 formed on the upper surface of the second partition wall 21d. They are in contact via 37.

[0018] The lumen below the second bulkhead 21d communicates with a pressurized air source 49 via a port 48. This serves as a primary pressure chamber 39. And, on the bottom wall 21b of this casing 21, there is a A second valve chamber 52 consisting of a small diameter recess opening toward the next pressure chamber 39 is formed; A second switching valve body 40 is slidably fitted therein. In addition, this second switching valve body 4 A compression spring 51 is disposed between the bottom wall 21b and the bottom wall 21b. And the second The switching valve body 40 is biased upward by this compression spring 51, and the second partition wall 21 d is applied to the ring-shaped second valve seat 41 formed on the lower surface through a sealing material 42. are in contact with each other.

[0019] A first valve seat 36 and a second valve seat 41 are provided between the primary pressure chamber 39 and the exhaust chamber 33. A secondary pressure chamber 38 is formed at the lower end and vertically penetrates the second partition wall 21d. two The secondary pressure chamber 38 is provided with two ports 43 and 44 that penetrate the casing 21 laterally. I'm being kicked. One of these ports 43 is connected to the pneumatic cylinder 1 through the air passage 3. It communicates with the air supply and exhaust port 16 of the rod side cylinder chamber 14 of No. 0. In addition, air ventilation Path 3 includes a 2-port 2-position pneumatic switching solenoid valve (2-port valve) 1 and a flow control valve 2. are interposed in parallel. The two-port valve 1 is in the state shown in the figure when energized.

[0020] Further, the above-mentioned pressure regulating piston 23 has a first partition wall 21c and a first notch extending downward. A small diameter portion 50a passes through the switching valve body 32, and the small diameter portion 50a passes through the first switching valve body 32. A rod 50 consisting of a large diameter portion 50b formed at an end that protrudes through the hole is removed. It is attached. Note that the small diameter portion 50a of the rod 50 is airtight with respect to the first partition wall 21c. The first switching valve body 32 is in a sliding state in which It is. Further, the length of the large diameter portion 50b of the rod 50 is longer than the length of the secondary pressure chamber 38. It is also considered to be slightly shorter.

[0021] Therefore, from the illustrated state, for example, air is supplied to the pressure regulating chamber 26 and the pressure regulating piston 2 3 rises, the top surface 50c of the large diameter portion 50b of the rod 50 is connected to the first switching valve body 32. This causes the secondary pressure chamber 38 and the exhaust chamber 33 to communicate with each other. It becomes a state. On the other hand, when air is supplied to the air supply chamber 24 and the pressure regulating piston 23 descends , the large diameter portion 50b of the rod 50 comes into contact with the second switching valve body 40 and pushes it down. As a result, the secondary pressure chamber 38 and the primary pressure chamber 39 are brought into communication. In addition, the first switching valve Small holes 32b and 40b are penetrated through the body 32 and the second switching valve body 40, respectively, and the first valve Ventilation is performed between the chamber 31 and the secondary pressure chamber 38 and between the second valve chamber 52 and the secondary pressure chamber 38. The upper part of each valve body 32, 40 due to the vertical movement of the pressure regulating piston 23 The downward motion is executed smoothly.

[0022] The opening and closing of each of the switching valve bodies 32 and 40 is carried out from a pressurized air source 49 through a pilot passage. This is performed using air pressure supplied via the PL. In the pilot passage PL, A 5-port valve 45 is interposed. This 5-port valve 45 is in a de-energized state. Port arrangement that supplies air pressure from the pressurized air source 49 to the port 29 of the air supply chamber 24 It is composed of

[0023] In addition, in the energized state, while the port 29 of the air supply chamber 24 is opened to the atmosphere, A predetermined port of the 3-port valve 47 located further downstream with respect to the pressurized air source 49 The port arrangement is also configured to supply air pressure from the pressurized air source 49 to the Ru. Note that the figure shows the state in which the 5-port valve 45 and the 3-port valve 47 are de-energized. are doing.

[0024] The 3-port valve 47 connects two ports other than the one connected to the 5-port valve 45. This is connected to a port 46 of the pressure regulating chamber 26 and a port 44 of the secondary pressure chamber 38 . These three ports of the 3-port valve 47 are 5-port in the energized state. The valve and the pressure regulating chamber 26 are communicated with each other, and the pressure regulating chamber 26 and the secondary pressure chamber 38 are connected in a non-energized state. are placed in communication with each other.

[0025] Next, the operation of this system will be explained. slow descent 5-port valve 45 is energized, 3-port valve 47 is de-energized, and 2-port valve 1 is energized. shall be.

[0026] Air pressure from the pressurized air source 49 passes through the pilot passage PL and the 5-port valve 45. Although it is supplied to the port valve 47, it is stopped there. On the other hand, the air supply room 24 is open to the atmosphere, and the pressure regulating chamber 26 and the secondary pressure chamber 38 are in communication. and , the rod side cylinder 1 pressurized due to the weight of the work W is in the secondary pressure chamber 38. There is pressure from 4. Then, the pressure from this rod side cylinder chamber 14 is achieved by slightly pushing up the pressure regulating piston 23 against the spring force of the pressure regulating spring 28. The secondary pressure chamber 38 and the exhaust chamber 33 communicate with each other, and the air in the rod side cylinder chamber 14 is gradually removed. The workpiece W is discharged and slowly lowered.

[0027] At this time, if the pressure from the rod side cylinder chamber 14 is too small, the two port Switch the port valve 1 to non-energized state, and switch the 3-port valve 47 to energized state. Then, the air pressure from the pressurized air source 49 is supplied to the pressure regulation chamber 26 . As a result, the pressure regulating pin The stone 23 rises significantly and pushes up the first switching valve body 32 significantly. Therefore, empty The flow rate is controlled from the rod side cylinder chamber 14 of the pressure cylinder 10 by the flow rate control valve 2. Exhaust is gradually carried out under controlled conditions. This allows the work W to be loosened in such a case. A smooth descent can be guaranteed. slow rise Both the 5-port valve 45 and 3-port valve 47 are de-energized, and the 2-port valve 1 is energized.

[0028] Air pressure from the pressurized air source 49 is supplied through the pilot passage PL and the 5-port valve 45. Since the air is supplied to the air chamber 24, the balance piston 22 descends, and the pressure is adjusted accordingly. A downward force acts on the piston 23. On the other hand, the pressure regulation chamber 26 and the secondary pressure chamber 38 communicate with each other. However, there is no major pressure applied here. Therefore, the above mentioned pushdown The lifting force becomes dominant, the pressure regulating piston 23 descends, and the secondary pressure chamber 38 and exhaust chamber 33 are connected. On the contrary, the primary pressure chamber 39 and the secondary pressure chamber 38 are balanced and slightly communicated. The state will be as follows. As a result, from the pressurized air source 49 through the main passage ML, the primary pressure chamber 3 The air pressure supplied to 9 is gradually supplied to the rod side cylinder chamber 14, Workpiece W slowly rises.

[0029] At this time, if the workpiece W does not rise due to some reason, the 2-port valve 1 to be de-energized, and the 3-port valve 47 to be energized. Then, the pressure regulating chamber 26 is opened to the atmosphere via the 3-port valve 47 and the 5-port valve 45. becomes. As a result, the pressure regulating piston 23 moves down significantly, causing the second switching valve body 40 to move down significantly. At the same time, the flow rate control is applied to the rod side cylinder chamber 14 of the pneumatic cylinder 10. Air is gradually supplied while the flow rate is controlled by the control valve 2. This results in It is possible to ensure that the workpiece W rises slowly in this case. rapid descent The 5-port valve 45 is energized, the 3-port valve 47 is energized, and the 2-port valve 1 is energized. do.

[0030] Air pressure from the pressurized air source 49 is supplied to the pressure regulating chamber 26, and the pressure regulating piston 23 is thereby , the first switching valve body 32 is pushed up greatly, and the secondary pressure chamber 38 and exhaust chamber are 33 communicates widely and is rapidly discharged from the rod side cylinder chamber 14 of the pneumatic cylinder 10. I feel relieved. As a result, the workpiece W rapidly descends. rapid rise The 5-port valve 45 is de-energized, the 3-port valve 47 is energized, and the 2-port valve 1 is energized. .

[0031] Air pressure is supplied from the pressurized air source 49 to the air supply chamber 24 through the pilot passage PL side. On the other hand, since the pressure regulating chamber 26 is open to the atmosphere, the pressure regulating piston 23 is large. and then presses down the second switching valve body 40 significantly. As a result, the pneumatic cylinder 10 The pressurized air source 49 is connected to the rod side cylinder chamber 14 through the main passage ML side. The air pressure supplied to the primary pressure chamber 39 is vigorously supplied, and thereby the workpiece W is rise rapidly.

[0032] Apart from such control, the pilot passage PL is constantly supplied with pressurized air from the pressurized air source 49. Air pressure is supplied, and pressure is stored in the pressure accumulator chamber 60. And this pressure accumulation When the air pressure in the pilot passage PL falls below a predetermined value, the chamber 60 releases the air pressure stored inside. is supplied to the pilot passage PL.

[0033] In this embodiment, when the workpiece W is raised rapidly, it may be temporarily or depending on the situation. In this case, a drop in air pressure may occur in the main passage ML. At times like this, Air pressure is supplied from the pressure accumulation chamber 60 to the pilot passage PL, and this is checked. The valve 70 prevents the water from flowing to the main passage ML side. Therefore, in the main passage ML Even if the air pressure decreases due to air pressure, the air pressure is maintained in the pilot passage PL. , the control state of the pneumatic control valve 20 is not affected.

[0034] This action and effect is particularly noticeable in the system of the second embodiment shown in FIG. It will be done. The system of the second embodiment arranges the pneumatic cylinder 10 of the first embodiment horizontally. At the same time, the roller 4 is attached to the workpiece W, and the roller 4 is also attached to the head side cylinder chamber 15. A pneumatic control valve 20a communicating with the air supply/exhaust port 17 is also provided. The pneumatic control valve 20a has exactly the same structure as the pneumatic control valve 20. Therefore, Although the structural explanation is omitted, in the figure, the suffix a is added to the symbol attached to the pneumatic control valve 20. By attaching , the constituent elements of both pneumatic control valves 20 and 20a are made to correspond to each other.

[0035] In this second embodiment, the main passage ML from one pressurized air source 49 is Connects to each primary pressure chamber 39, 39a of the right pneumatic control valve 20, 20a, and connects to the main pressure chamber 39, 39a. The pilot passage PL on the downstream side of the pilot passage ML is connected to one of the 5-port valves 45 and 45a. connected to the port. Then, a branch road 8 to the main passage ML and the pilot passage PL A pressure accumulating chamber 60 is provided in the 0, and a check valve 70 is provided on the main passage ML side. Established.

[0036] In addition, the parallel circuit of the 2-port valve 1 and the flow control valve 2 is connected to the main passage ML and pressurized air. It was decided to arrange it between the air source 49 and the air source 49. The functions and effects of this system will be explained using examples of rapid leftward movement and slow leftward movement. rapid left movement In order to perform rapid leftward movement, the air pressure of the cylinder connected to the rod side cylinder chamber 14 is controlled. The 5-port valve 45 that controls the valve 20 is energized, the 3-port valve 47 is energized, The 5-port valve 45a that controls the other pneumatic control valve 20a is de-energized; The port valve 47a is energized, and the 2-port valve 1 is further energized.

[0037] As a result, in the pneumatic control valve 20 connected to the rod side cylinder chamber 14, In this case, air pressure from the pressurized air source 49 is supplied to the pressure regulating chamber 26, and the pressure regulating piston 23 is connected to the pressure regulating chamber 26. Therefore, it rises greatly, pushes up the first switching valve body 32 greatly, and the secondary pressure chamber 38 and the exhaust gas The chamber 33 communicates widely, and air rapidly flows from the rod side cylinder chamber 14 of the pneumatic cylinder 10. Exhaust is done.

[0038] On the other hand, in the pneumatic control valve 20a connected to the head side cylinder chamber 15, While the air pressure from the pressurized air source 49 is supplied to the air supply chamber 24a, the pressure regulation chamber 26a is The atmosphere is released, the pressure regulating piston 23a descends greatly, and the second switching valve body 40a is greatly moved. Press down hard. As a result, to the rod side cylinder chamber 14 of the pneumatic cylinder 10, Air pressure supplied from the pressurized air source 49 to the primary pressure chamber 39a through the main passage ML side is supplied vigorously.

[0039] In this way, in the pneumatic cylinder 10, exhaust gas is rapidly discharged from the rod side cylinder chamber 14. Since air is rapidly supplied to the head side cylinder chamber 15, the workpiece W is Move quickly to the left.

[0040] At this time, if the leftward movement speed is extremely fast, the air pressure is down in the main passage ML. If no countermeasures are taken, as in the conventional example shown in Figure 3, , a drop in air pressure also occurs in the pilot passage PL. In that case, In the pneumatic control valve 20 connected to the head side cylinder chamber 14, the 5-port valve 4 The air pressure that was being supplied to the pressure regulation chamber 26 through the 5 and 3 port valves 47 decreased and the pressure was regulated. It becomes impossible to push up the pressure piston 23, and the secondary pressure chamber 38 and exhaust chamber 33 is blocked, making it impossible to exhaust air from the rod side cylinder chamber 14. There may be cases where When this happens, the workpiece W, which was moving rapidly to the left, stops. Then this time The air pressure in the head side cylinder chamber 15 and the main passage ML is restored, and the pilot communication is resumed. The pressure in the path PL is restored, the workpiece W is rapidly moved to the left, and the same process is repeated. As a result In the conventional example shown in FIG. 3, in which no countermeasures are taken, when the workpiece W is moved rapidly to the left, It will move rapidly to the left while vibrating, resulting in an unstable operating state. depending on the case Therefore, it cannot be driven while vibrating like this, and there is a risk that it will become inoperable. be.

[0041] In contrast, in this embodiment, when air pressure decreases on the main passage ML side, Even if the pilot passage PL is The air pressure is maintained and the problems described above are avoided. Slow leftward movement 5 port valve 45 is energized, 3 port valve 47 is not energized, 5 port valve 45a, 3 port Both the port valves 47a are de-energized, and the 2-port valve 1 is energized.

[0042] In this state, the air pressure drop on the main passage ML side as described above will occur in principle. do not. However, as explained in the first embodiment, for some reason the workpiece W If it stops moving, it may switch to flow rate control. Switch to flow control As a result, the air pressure in the main passage ML naturally decreases. Therefore, according to Fig. In the future, switching to this flow control could result in an inoperable condition. However, in this embodiment, since the air pressure in the pilot passage PL is always maintained, Such inoperability never occurs.

[0043] As explained above, according to each embodiment, the main passage ML and the pilot passage PL By arranging the pressure accumulation chamber 60 and the check valve 70 between the This prevents air pressure from falling on the front side and allows stable control to be performed at all times. As a result , further speeding up becomes possible.

[0044] Furthermore, according to the second embodiment, slow-speed operation can always be guaranteed; It is also possible to prevent inoperability during flow rate control. Although one embodiment of the present invention has been described above, the present invention is not limited to this, and the gist of the invention is described below. Various aspects can be adopted within the range.

[0045]

[Effect of the idea]

As described above, according to the pneumatic cylinder control device of the present invention, the pilot passage side is always Pneumatic pressure can be maintained properly, and the pressurized air source can be used for driving pneumatic cylinders and controlling pneumatic pressure. When used for controlling a control valve, prevent unstable operation or inoperable state of the pneumatic cylinder. It is possible to guarantee stable operation at all times. As a result, the pneumatic system The cylinder drive speed can be further increased, making the entire system more efficient. This allows for smooth driving.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a pneumatic cylinder drive system according to a first embodiment.

FIG. 2 is an overall configuration diagram of a pneumatic cylinder drive system according to a second embodiment.

FIG. 3 is an overall configuration diagram of a conventional pneumatic cylinder drive system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... 2 port valve, 2... Flow rate control valve, 3... Air passage, 10... Pneumatic cylinder, 14... Rod side cylinder chamber, 15... Head side cylinder chamber, 16 ,1
7... Supply/exhaust port, 20, 20a... Pneumatic control valve, 22... Balance piston, 23, 23a...
Pressure regulating piston, 24, 24a... air supply chamber, 25...
Balance chamber, 26, 26a... Pressure regulation chamber, 27... Pressure regulation handle, 28... Pressure regulation spring, 29, 34, 4
3, 44, 46, 48...port, 30...screw,
31... First valve chamber, 32, 32a... First switching valve body, 33... Exhaust chamber, 38, 38a... Secondary pressure chamber,
39, 39a...Primary pressure chamber, 40,40a...Second
Switching valve body, 45, 45a...5 port valve, 47, 47
a...3 port valve, 49...pressurized air source, 50...
・Rod, 60...accumulation chamber, 70...check valve,
80... Branch road, ML... Main passage, PL...
Pilot passage, W...work.

Claims (1)

[Scope of utility model registration request] Claim 1: A switching valve element inside a pneumatic control valve, which communicates with a pressurized air source via a main passage and also with an air supply/exhaust port of a pneumatic cylinder, is supplied by a pilot passage branching from the main passage. In a pneumatic cylinder control device that performs drive control of the pneumatic cylinder by switching the communication state between the pneumatic control valve and the pneumatic cylinder by switching and controlling the pneumatic pressure generated by the A pneumatic cylinder control device characterized in that a pressure accumulation chamber is interposed in the pressure accumulation chamber and a check valve for preventing backflow from the pilot passage side to the main passage side is interposed between the pressure accumulation chamber and the main passage.