JP2558197B2 - Pressurization control device for fluid pressure cylinder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressurizing control device for a fluid pressure cylinder capable of outputting a pressing force at the end of a piston stroke.

[0002]

2. Description of the Related Art The inventors of the present invention firstly found that 3-4
No. 7,667, proposes a pressurizing unit having an electro-hydraulic pressure regulator and a 5-port switching valve. This already proposed pressurizing unit has the advantage that the output pressure can be set to an arbitrary pressure by an electric-fluid pressure regulator, but there is a lack of consideration for the stroke speed of the piston, and the pressure setting of the head side pressure chamber If the difference between the air pressure in the rod side pressure chamber and the air pressure is large, the piston jumps out and accelerates.Therefore, when the stroke of the piston is short, the piston started at high speed collides with the cylinder at the end of the stroke, which causes a large impact noise. May not only deteriorate the working environment and may damage the device in extreme cases.

Conventionally, it is known to stop the piston of the fluid pressure cylinder at the end of the stroke in a buffer manner, and switch the throttle on the exhaust side near the end of the stroke of the piston or switch the exhaust to the relief valve. However, these known buffer stop means have a long stroke time of the piston, or even if the output pressure is increased, even if the piston is stopped buffering at a specific output pressure, the stroke time is reduced when the output pressure becomes large. Therefore, there is a problem in that it is not possible to cope with fluctuations in the output pressure.

[0004]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a fluid capable of buffering a piston started at a high speed at the stroke end and outputting a pressing force irrespective of fluctuations in the output pressure. A pressure control device for a pressure cylinder, and a valve unit used for the pressure control device.

[0005]

In order to solve the above-mentioned problems, a pressurizing control device for a fluid pressure cylinder according to the present invention comprises:
In a control device for a fluid pressure cylinder, comprising: a fluid pressure cylinder; and a flow passage on the head side and a rod side for supplying / discharging a pressure fluid to / from the pressure chambers on the head side and the rod side, which are defined by the piston of the fluid pressure cylinder, In the flow path on the head side, a first regulator whose output pressure can be adjusted depending on the magnitude of pilot fluid pressure, and an output pressure depending on the magnitude of the applied voltage or current value for outputting pilot fluid to the first regulator A first electro-fluid pressure regulator that can be adjusted is provided, and a second regulator that can adjust the output pressure according to the magnitude of the pilot fluid pressure is installed in the flow path on the rod side in parallel with the applied voltage or current value. The output pressure can be adjusted depending on the size, and at the end of the piston stroke
The second electricity to which the application of voltage or the supply of current is released
A fluid pressure regulator , a third regulator capable of adjusting the output pressure at a relatively low pressure , and the second regulator
At the beginning of the piston stroke, output pilot fluid
As the low-pressure fluid output from the third regulator,
Second electro-hydraulic regulation during Ston's stroke
It is characterized in that a three-way valve for switching to the fluid output from the controller is provided. Also, to facilitate assembly, the
The invention has a supply port that communicates with a pressure source, first and second output ports that communicate with the head side and rod side pressure chambers of a fluid pressure cylinder, and a main discharge port and first and second sub discharge ports. The case, the first and second regulators whose output pressure can be adjusted depending on the magnitude of the pilot fluid pressure, and the output pressure which can be adjusted depending on the magnitude of the applied voltage or current value for outputting the pilot fluid to the first regulator. The output pressure can be adjusted depending on the magnitude of the applied voltage or current value, which is installed in parallel with the electro-hydraulic pressure regulator of No. 1 and
Voltage application or current at the end of the stroke of the stone
A second electro-hydraulic pressure regulator which is de- energized ,
And a third regulator capable of adjusting the output pressure at a relatively low pressure, and a pilot flow output to the second regulator.
Is the body the third regulator at the beginning of the piston stroke?
Low pressure fluid output from the piston during stroke
Flow from the second electricity-flow decompression regulator to
A three-way valve for switching to the body, the first and second regulators are provided between the supply port and the first and second output ports, and the first electro-hydraulic pressure regulator is provided between the supply port and the first output port. A second electro-hydraulic pressure regulator and a third regulator are provided between the auxiliary outlet and a three-way valve between the supply inlet and the second auxiliary outlet.
A second electro-hydraulic pressure regulator and a third regulator
Output port of the controller and the pilot port of the first regulator.
It is characterized by a valve unit that is installed between each port, and that connects the discharge boats of the first and second regulators to the main discharge port.

[0006]

The fluid pressure in the head side pressure chamber can be set to an arbitrary pressure by the first regulator by adjusting the pilot fluid pressure according to the magnitude of the applied voltage or current value of the first electro-hydraulic pressure regulator. , The fluid pressure in the rod side pressure chamber is switched between the second electric-fluid pressure regulator and the third regulator by the three-way valve to make the pilot fluid pressure high and low, and the pilot fluid pressures are adjusted respectively. Then, the second regulator can be set to an arbitrary pressure. Therefore, the first
And, by adjusting the fluid pressure output from the second regulator to make the fluid pressure in the pressure chambers on the head side and the rod side appropriate pressure according to the stroke position of the piston, the piston is started at high speed, The piston started at high speed is decelerated and stopped at the end of the stroke as a buffer,
Furthermore, a desired pressing force can be generated at the end of the stroke. In the return stroke after pressurizing the cylinder, various fluid pressures are applied to the rod side for a certain period of time to the same pressure as the fluid pressure on the head side in the immediately preceding pressurization stroke to accelerate and return to a low pressure before deceleration. It is possible to return to the end of the stroke in a buffered manner without being affected by the pressing force of.

Furthermore, by assembling these valves in the case, the piping can be easily connected and the user can assemble them at the work site.

[0008]

1 shows an embodiment of the present invention, in which a fluid pressure cylinder 1 comprises a piston 2 and a rod 3, and a head side pressure chamber 4a and a rod side pressure chamber 4b partitioned by the piston 2 are shown.
Are connected to the air source 6 by the flow paths 5a and 5b. The flow path 5a includes a first regulator 11 and a first electro-hydraulic pressure regulator 12 that outputs a pilot fluid to the regulator 11. The first regulator 11 produces an output pressure depending on the magnitude of the pilot fluid pressure. The first electro-hydraulic regulator 1 is adjustable.
2 is configured so that the output pressure can be adjusted by the magnitude of the applied voltage or the current value. In addition, the flow path 5b is
The second regulator 14, the second electro-hydraulic pressure regulator 15 and the third regulator 1 installed in parallel.
6, the electromagnetic 3 for switching the fluid output from the second electro-hydraulic pressure regulator 15 and the third regulator 16 and outputting it to the second regulator 14 as a pilot fluid.
And a one-way valve 17. These second regulators 1
4 and the electro-hydraulic pressure regulator 15 have the same configuration as the first regulator 11 and the electro-fluid pressure regulator 12, and the third regulator 16 is capable of manually adjusting the output pressure, and has the second electro-hydraulic pressure regulator 15. The fluid pressure regulator 15 is configured to output a low-pressure fluid. Then, these valves 12, 15, 17 are operated by a timer.

Next, the operation of the above embodiment will be described with reference to FIG. FIG. 1 illustrates a first electro-hydraulic pressure regulator 12
When the applied voltage is released, the air in the pressure chamber 4a is discharged from the first regulator 11, and the low pressure pilot air in the third regulator 16 by switching the electromagnetic three-way valve 17 causes the pressure in the pressure chamber from the second regulator 14. 4b shows a state in which low-pressure air is supplied, and the piston 2 moving upward in the figure is held by the low-pressure air pressure. In this state, when a desired voltage is applied to the first and second electro-hydraulic pressure regulators 12 and 15, high-pressure air is supplied from the first regulator 11 to the pressure chamber 4a, while the pressure chamber 4b receives electromagnetic waves. Since the low-pressure pilot air is output by the one-way valve 17 and the pressure is low, the piston 2 starts at high speed. When the solenoid of the electromagnetic three-way valve 17 is excited after the lapse of the set time T ₁ by the timer and the pilot air output to the second regulator 14 is switched to the high pressure second electric-fluid pressure regulator 15 side, The high pressure air having substantially the same pressure as that of the pressure chamber 4a is supplied from the regulator 14 of No. 2 to the pressure chamber 4b, the piston 2 is decelerated by this, and the piston 2 is stopped at the end of the driving stroke in a buffered manner when the time T ₂ is elapsed by the timer. To do. At the end of the drive stroke, the second electro-hydraulic regulator 15
By canceling the application of the above voltage and setting the applied voltage of the first electro-hydraulic pressure regulator 12 to a required value.
Thus , a required pressing force is generated in the piston 2.

After the lapse of a predetermined pressurizing time, the application of the voltage of the first electro-hydraulic pressure regulator 12 is released, and the second electro-hydraulic pressure regulator 15 is supplied with the first electric voltage.
Air - Applying a <br/> voltage applied immediately before the fluid pressure regulator 12, together with the air pressure chamber 4a is discharged state from the first regulator 11, is supplied to the pressure chamber 4b, just before the The piston 2 returns at high speed by the air having the same pressure as the pressure chamber 4a at the time of pressurization . After the elapse of a predetermined time T ₃ by the timer, the second electro-hydraulic pressure regulator 1
When the set pressure of 5 is set to a low pressure, the air pressure output from the second regulator 14 becomes a low pressure, whereby the piston 2 is decelerated and stopped at the end of the return stroke in a buffer manner.
After the lapse of time T ₄ , the solenoid is de-energized and the solenoid 3
When the one-way valve 17 is switched to the third regulator 16 side, the air pressure output from the second regulator 14 becomes low and the state before driving is restored. Therefore, not only can the piston 2 started at a high speed be stopped at the end of the drive and return strokes, but also the stroke time can be shortened.

When the fluid pressure cylinder 1 is used for moving the electrode in spot welding, the piston 2 and the rod 3 may not return due to electrode welding. In this case, when a pulse current is supplied to the second electro-hydraulic pressure regulator 15 at time T ₅ after a predetermined time has elapsed, higher pressure air is supplied to the pressure chamber 4b to restore the piston 2 and the like. You can

FIG. 3 shows a valve unit 20 in which all the valves in the pressurization control device are incorporated in a case 21, which includes a supply port 22 communicating with an air source 6 and a flow path 5.
pressure chambers 4a, 4b of the fluid pressure cylinder 1 via a, 5b
First and second output ports 23a, 23 that communicate with the respective
b, the main outlet 24 and the first and second sub outlets 25
a and 25b. The first and second regulators 11 and 14 include a supply port 22 and first and second output ports 23.
The first electro-hydraulic pressure regulator 1 is provided between a and 23b.
2 is installed between the supply port 22 and the first auxiliary discharge port 25a, and the second electro-hydraulic pressure regulator 15 and the third regulator 16 are connected to the supply port 22 and the second auxiliary discharge port 2a.
The discharge ports R of the first and second regulators 11 and 14 are connected in parallel to each other and are connected to the main discharge port 24. The first electro-hydraulic pressure regulator 1
The output ports of the 2 and electromagnetic 3-way valve 17 communicate with the pilot ports of the first and second regulators 11 and 14, and the supply port and discharge port of the electromagnetic 3-way valve 17 are the second electro-hydraulic pressure regulator. 15 and third regulator 16
Switching to each of the output ports and communicating with each other is the same as in FIG. Since all the necessary valves are assembled in the case 21 of the valve unit 20, the user can easily assemble it at the work site.

[0013]

The fluid pressure cylinder pressurization control device according to the present invention can reduce the stroke time of the piston because it can decelerate the piston started at high speed and stop it at the stroke end position in a buffered manner. However, it is possible to prevent generation of impact noise and damage to the fluid pressure cylinder due to collision. Moreover, since the fluid pressure supplied to the pressure chamber can be adjusted by the pilot fluid pressure, the flow rate of the pressure fluid supplied to the fluid pressure cylinder can be increased.

Moreover, the pressurizing control device can be easily assembled by the valve unit in which all necessary valves are incorporated.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment.

FIG. 2 is an explanatory diagram of an operation.

FIG. 3 is a configuration diagram of a valve unit.

[Explanation of symbols]

 1 Cylinder 2 Piston 4a, 4b Pressure chamber 5a, 5b Flow path 11,14 1st, 2nd regulator 12, 15 1st, 2nd electric-fluid pressure regulator 16 3rd regulator 17 Solenoid 3 way valve 20 valve Unit 21 Case 22 Supply port 23a, 23b First and second output port 24 Main discharge port 25a, 25b First and second auxiliary discharge port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mikio Yamaji 4-2-2 Kinunodai, Taniwahara-mura, Tsukuba-gun, Ibaraki SMC Corporation Tsukuba Technical Center (56) Reference JP-A-58-644 (JP) , A) Jitsukai Sho 58-38002 (JP, U) Jitsuhei 2-39044 (JP, Y2)

Claims (2)

(57) [Claims] 1. A flow-resting device comprising a fluid pressure cylinder and head-side and rod-side flow passages for supplying and discharging pressure fluid to and from the head-side and rod-side pressure chambers defined by the piston of the fluid-pressure cylinder. In a control device for a cylinder, a first regulator whose output pressure can be adjusted depending on the magnitude of pilot fluid pressure in the flow path on the head side, and an applied voltage or current value for outputting pilot fluid to the first regulator The first that can adjust the output pressure by the size of
The electric-fluid pressure regulator is installed in the rod side flow path, and the second regulator that can adjust the output pressure according to the magnitude of the pilot fluid pressure and the output pressure depending on the magnitude of the applied voltage or current value are installed in parallel. Is adjustable and voltage is applied at the end of the piston stroke.
Alternatively , a second electro-hydraulic pressure regulator that releases the supply of current, a third regulator that can adjust the output pressure at a relatively low pressure , and a power output to the second regulator.
Apply the ilot fluid to the 3rd leg at the beginning of the piston stroke.
The low pressure fluid output from the generator
Output from the second electro-hydraulic regulator during trooke
And a three-way valve for switching to the fluid to be controlled, the pressurization control device for the fluid pressure cylinder. 2. A supply port communicating with a pressure source, a head side of a fluid pressure cylinder, and a first communicating with a rod side pressure chamber.
A case having a second output port, a main discharge port, and a first and second sub discharge port, first and second regulators whose output pressure can be adjusted depending on the magnitude of pilot fluid pressure, and a first regulator Installed in parallel with a first electro-hydraulic pressure regulator for outputting pilot fluid, the output pressure of which can be adjusted depending on the magnitude of an applied voltage or current value,
The output pressure can be adjusted according to the magnitude of the applied voltage or current value.
In addition, voltage is applied or
Is a second electro-hydraulic pressure regulator for which the supply of electric current is released, a third regulator that can adjust the output pressure at a relatively low pressure , and a pyro output to the second regulator.
Put the fluid in the third regulation at the beginning of the piston stroke.
The low pressure fluid output from the motor
Output from the second electro-hydraulic regulator
A three-way valve for switching to a fluid to be supplied, the first and second regulators are provided between the supply port and the first and second output ports, and the first electro-hydraulic pressure regulator is provided at the supply port and the first of between sub-discharge port, a second electrical - a fluid pressure regulator and a third regulator between a supply port and a second sub-discharge ports, a 3-way valve the second electric - hydraulic regulator
Output port of the third regulator and the first regulator
A valve unit, wherein the valve unit is installed between pilot ports of the generator, and the discharge ports of the first and second regulators are connected to the main discharge port.