JPH09329105A - Intermediate speed control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable adjustment to moderate shock at a terminal end even in the case of a high-speed driving long-stroke cylinder so as to enable high-speed driving of the cylinder in a device for moving a heavy article with the cylinder. SOLUTION: An output conversion part 2 such as a photocoupler is electrically connected to a cylinder sensor 1. A solenoid valve 3 is electrically connected to the output conversion part 2, and a secondary piping port of this solenoid valve 3 is piping-connected to a speed controller provided at a cylinder, and a stop plug 4 is arranged on the other secondary piping port. An intermediate speed controller 5 is piping connected to a primary piping port of the solenoid valve 3, and a check valve 6 is piping connected to the other end of this intermediate speed controller 5. The intermediate speed controller 5 is set with less flow rate than that of the speed controller. A T-shaped piping 7 is provided for combining the other end of the check valve 6 with the primary piping port of the solenoid valve 3. They are all contained in a case 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control unit used for pneumatic or hydraulic cylinder control, and more particularly to an intermediate speed control unit for controlling shock mitigation at the end of a cylinder stroke.

[0002]

2. Description of the Related Art Conventionally, when a heavy object is moved at a high speed for a long stroke by using a cylinder, a large shock is generated at the end of the use stroke. Therefore, an external hydraulic shock absorber or the like is installed to prevent the shock at the end. We are trying to reduce it ("Automation technology" issued on October 1, 1995,
See pages 47-51).

Specifically, as shown in FIG. 5, a cylinder 21, a speed controller 22 connected to both ends of the cylinder 21 by a pipe, an electromagnetic valve 23 having a secondary side connected to the speed controller 22, and a stroke end. And a shock absorber 24 installed in the.

In such a structure, when the solenoid valve 23 is switched, the cylinder 21 starts to operate, and the cylinder rod 25 moves at a speed corresponding to the throttle flow rate of the speed controller 22. When the cylinder rod 25 moves to the vicinity of the terminal end, it abuts on the shock absorber 24, and thereafter, the resistance of the shock absorber 24 decelerates and moves to the terminal end.

[0005]

However, the above-described conventional technique for alleviating shock has a problem that the cylinder cannot be driven at high speed. That is,
If the shock absorber tries to absorb the energy that becomes a shock in a short stroke, it cannot absorb the impact energy, or if the shock absorber is reluctant to slide in order to increase the energy absorption, a large shock will occur at the time of collision with the shock absorber. It was difficult to make adjustments to mitigate the shock at the end, such as when it occurred. Therefore, the cylinder driving speed must be reduced to the adjustable range to reduce the impact energy.

The present invention has been made in consideration of the above problems. Even in the case of a long stroke cylinder driven at a high speed, it is possible to adjust the shock at the end so as to drive the cylinder at a high speed. The purpose is to provide the intermediate speed controller unit.

[0007]

In order to achieve the above object, an intermediate speed control unit of the present invention comprises a cylinder sensor for detecting the position of a cylinder, and a speed controller provided on the cylinder having a secondary side piping port for piping. A solenoid valve that is connected and switches the flow path when the cylinder sensor detects a cylinder; a stopper provided on the other secondary side piping port of the solenoid valve; and a pipe connected to the primary side piping port of the solenoid valve. It is configured to have an intermediate speed controller set to a flow rate lower than that of the speed controller, and a T-type pipe that joins the intermediate speed controller and the primary side piping port of the solenoid valve.

Further, preferably, the cylinder sensor is of a magnetic sensing type, and more preferably, the cylinder sensor, the solenoid valve, the stopper, the intermediate speed controller and the T-type pipe are housed in a case. .

According to the intermediate speed control unit of the present invention having the above structure, the cylinder sensor detects that the cylinder rod has reached a predetermined position, the solenoid valve is activated by the detection of the cylinder sensor, and the pipe passage To the intermediate speed controller side. The exhaust speed of the cylinder depends on the flow rate of the intermediate speed controller, and the speed of the cylinder is reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the intermediate speed controller unit of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram of the intermediate speed controller unit, Fig. 2
Is a block diagram of a cylinder heavy object moving device using an intermediate speed controller unit, FIG. 3 is a diagram showing a flow path before the operation of the intermediate speed controller unit, and FIG. 4 is a diagram showing a flow path after the operation of the intermediate speed controller unit. Is. In FIG. 1, reference numeral 1 denotes a magnetic sensing type cylinder sensor, to which an output converter 2 such as a photocoupler is electrically connected. A solenoid valve 3 is electrically connected to the output conversion unit 2, a secondary side piping port of the solenoid valve 3 is connected to a speed controller provided in a cylinder described later by piping, and another secondary side piping port is provided. A stopper plug 4 is arranged in this.

Further, an intermediate speed controller 5 is connected to the primary side piping port of the solenoid valve 3, and a check valve 6 is connected to the other end of the intermediate speed controller 5 by piping. Further, the intermediate speed controller 5 is set so that the flow rate is narrower than that of the speed controller. To the other end of the check valve 6 and the primary side piping port of the solenoid valve 3, a T-type piping 7 for joining these is connected by piping. Then, these cylinder sensor 1, output conversion unit 2, solenoid valve 3, intermediate speed controller 5,
The check valve 6 and the T-shaped pipe 7 are housed in a case 8.

Such an intermediate speed controller is
As shown in FIG. 2, it is used in a cylinder heavy object moving device. In FIG. 2, an intermediate speed control unit 10 of the present invention is arranged at a predetermined position (a position where deceleration is started) on the outer circumference of the cylinder 9.
It is connected to the speed controller 11 which is connected to the terminal end of the pipe, and to the direction switching solenoid valve 12. Reference numeral 13 is a cylinder piston provided with a permanent magnet, and 14 is a cylinder rod.

Next, the operation will be described. First, when the cylinder 9 is operated, as the initial flow path, as shown in FIG. 3, the flow path to which the intermediate speed controller 5 of the solenoid valve 3 is not connected by piping is used. Therefore, the cylinder rod 14 moves at the throttle flow rate of the speed controller 11, and when the cylinder piston 13 reaches almost directly below the intermediate speed controller unit 10, the permanent magnet causes the cylinder sensor 1 to move the cylinder sensor 1 to the cylinder piston 13.
Is detected and output to the solenoid valve 3 via the output conversion unit 2, and the solenoid valve 3 switches the flow path to the intermediate speed controller 5, as shown in FIG.

Then, the exhaust speed of the cylinder 9 is further reduced by the intermediate speed controller 5, so that the speed of the cylinder rod 14 is reduced. As a result, the throttle flow rate of the intermediate speed controller 5 is controlled until the end. However, since there is inertia during high-speed movement from the starting point to the intermediate speed controller unit 10, it gradually decelerates during the stroke to the end point, and becomes a low speed near the end point according to the throttle flow rate of the intermediate speed controller 5. . Therefore, there is almost no shock at the end, and it is possible to move at a high speed until switching to the intermediate speed controller 5, which shortens the total time.

[0015]

As described above, in the intermediate speed controller unit of the present invention, the exhaust speed is switched to the low speed in the middle of the stroke, so that a sufficient stroke from the position where the exhaust speed is switched to the end is used. Therefore, it is possible to stop without generating a shock at the end without arranging a shock absorber, etc., and it is possible to move at high speed until switching is completed, so the total movement time of the cylinder Can be shortened. Further, when all the components are housed in a case and integrated, the positions can be changed with screws, bands, etc. as in the conventional cylinder sensor, so that the optimum control position can be easily found.

[Brief description of drawings]

FIG. 1 shows a configuration diagram of an intermediate speed controller unit.

FIG. 2 shows a configuration diagram of a heavy object moving device for a cylinder using an intermediate speed controller unit.

FIG. 3 shows a diagram of the flow path before the operation of the intermediate speed controller unit.

FIG. 4 shows a diagram of the flow path after operation of the intermediate speed controller unit.

FIG. 5 is a configuration diagram of a heavy-weight moving device for a cylinder using a conventional shock absorber.

[Explanation of symbols]

 1 Cylinder Sensor 2 Output Converter 3 Solenoid Valve 4 Stopper 5 Intermediate Speed Controller 6 Check Valve 7 T-Type Piping 8 Case 9 Cylinder 10 Intermediate Speed Controller Unit 11 Speed Controller 12 Direction Switching Solenoid Valve 13 Cylinder Piston 14 Cylinder Rod

Claims (3)

[Claims] 1. A cylinder sensor for detecting a position of a cylinder, and a solenoid valve for connecting a secondary side piping port to a speed controller provided in the cylinder, and switching a flow path when the cylinder sensor detects the cylinder. , A stopcock provided on the other secondary side piping port of the solenoid valve, an intermediate speed controller that is connected to the primary side piping port of the solenoid valve by piping and has a lower flow rate than the speed controller, an intermediate speed controller and an electromagnetic An intermediate speed control unit having a T-shaped pipe that joins the primary side piping port of the valve. 2. The intermediate speed control unit according to claim 1, wherein the cylinder sensor is of a magnetic sensing type. 3. The intermediate speed control unit according to claim 1, wherein the cylinder sensor, the solenoid valve, the stopper, the intermediate speed controller and the T-shaped pipe are housed in a case.