JPH11272332A - Positioning cylinder device - Google Patents

Abstract

(57) [Problem] To provide a positioning cylinder device capable of easily changing a position of a stroke end of a piston rod. SOLUTION: A cylinder body 1 having a piston 2 therein.
A hollow piston rod 3 extending outward from the piston 2 at one end of the cylinder body 1, a ball screw 5 rotating in accordance with the movement of the piston 2, and a ball screw 5
A rotation angle detector 11 for detecting the rotation angle of the cylinder, a direction switching valve 8 capable of supplying working fluid to the rod-side fluid chamber 1a and the head-side fluid chamber 1b in the cylinder body 1, and a rotation angle detector 11
Rotation angle detection signal 11 s, operating range signal 15 s set in advance, and operation command signal 16 s input from outside
And a controller 10 that excites the solenoids 9a and 9b of the direction switching valve 8 based on the control signal, and changes the set value of the operating range signal 15s to change the stroke end of the piston rod 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a positioning cylinder device.

[0002]

2. Description of the Related Art Conventionally, when a reciprocating actuator such as a hydraulic cylinder is used to reciprocate various components of a machine between arbitrary points according to the stroke range of the actuator, the reciprocating motion of the actuator is required. The detection of whether the moving member or the moving object of the machine has reached the set forward stroke end or return stroke end is performed by detecting means such as a separately installed limit switch, and the arrival detection from the detecting means is performed. The operation of the actuator is stopped based on the signal.

[0003]

However, in the actuator stopping mechanism as described above, when changing the position of each stroke end at which the moving target member of the machine should reciprocate,
It is necessary to change the installation position of the detection means such as a limit switch.

If the position of the detecting means is not set properly, the member to be moved of the machine cannot be reciprocated with high accuracy.

The present invention has been made in view of the above circumstances, and has as its object to provide a positioning cylinder device that can easily change the position of the stroke end of a piston rod as a reciprocating member.

[0006]

In order to achieve the above object, a positioning cylinder device according to a first aspect of the present invention comprises a cylinder body having a piston therein and a hollow body extending from the piston to one end of the cylinder body. A piston rod, a ball screw disposed in the cylinder body so as to penetrate the piston so as to be able to fit into the piston rod and rotate in the circumferential direction, and a piston screw fixed to the piston and moving the piston relative to the cylinder body. Accordingly, a ball nut for rotating the ball screw in the circumferential direction, a rotation angle detector for detecting the rotation angle of the ball screw, and a working fluid are supplied to the rod-side fluid chamber and the head-side fluid chamber in the cylinder body divided by the piston. A direction switching valve of an electromagnetic switching type, and a rotation angle detection signal from the rotation angle detector, which is set in advance. Based on the operation command signal input from the operating range signal and an external and a controller for energizing the solenoid of the directional control valve.

Further, in the positioning cylinder device according to the second aspect of the present invention, a cylinder body having a piston therein, a hollow piston rod extending from the piston to one end of the cylinder body, and a piston rod can be fitted. A sensor supporting rod that penetrates through the piston and is disposed in the cylinder body, and a magnetic scale that extends in the cylinder axis direction and that is attached to the inner surface of the piston rod.
A magnetic sensor head attached to the sensor support rod so as to be located inside the piston rod and detecting a relative position of the magnetic scale; and a rod-side fluid chamber and a head-side fluid chamber in a cylinder body divided by a piston. An electromagnetic switching type directional switching valve capable of supplying a fluid, and a solenoid of the directional switching valve is excited based on a position detection signal from the magnetic sensor head, a preset operation range signal, and an operation command signal input from outside. Controller.

Further, in the positioning cylinder device according to the third aspect of the present invention, the cylinder body in which the piston is housed, the hollow piston rod extending from the piston to one end of the cylinder body, and the piston rod can be fitted. A ball screw disposed in the cylinder body so as to penetrate the piston and rotate in the circumferential direction, and the piston is fixed and the piston is moved in the axial direction with the rotation of the ball screw in the circumferential direction. A ball nut,
A motor that rotates the ball screw in the circumferential direction, a rotation angle detector that detects the rotation angle of the ball screw, a rotation angle detection signal from the rotation angle detector, a preset operating range signal, and an external input. A controller for operating the motor based on the operation command signal.

In the positioning cylinder device according to the first aspect of the present invention, the linear motion of the piston is converted into a rotational motion via a ball screw and a ball nut, and the rotational motion of the ball screw is detected by a rotational angle detector. Based on this, the controller determines the position of the piston with respect to the cylinder body.

Further, based on a rotation angle detection signal from a rotation angle detector, a preset operation range signal and an operation command signal input from the outside, the controller excites a solenoid of the directional control valve, and a controller inside the cylinder body. The working fluid is supplied to the rod-side fluid chamber or the head-side fluid chamber.

In the positioning cylinder device according to a second aspect of the present invention, the controller determines the position of the piston with respect to the cylinder body based on the displacement of the magnetic scale in the piston rod detected by the magnetic sensor head.

Further, based on a position detection signal from the magnetic sensor head, a preset operation range signal and an externally input operation command signal, the controller excites the solenoid of the directional control valve, and the rod side in the cylinder main body. The working fluid is supplied to the fluid chamber or the head-side fluid chamber.

In the positioning cylinder device according to a third aspect of the present invention, the controller determines the position of the piston with respect to the cylinder body based on the rotation angle of the ball screw for moving the cylinder detected by the rotation angle detector.

Further, the controller operates the motor based on the rotation angle detector, an operation range signal set in advance, and an operation command signal input from the outside.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a positioning cylinder device according to the present invention.

This positioning cylinder device has a piston 2
And a hollow piston rod 3 extending outward from the piston 2 at one end of the cylinder body 1
And a ball screw 5 penetrating through the piston 2 and coaxially arranged in the cylinder body 1 so as to be able to rotate in the circumferential direction, and a ball screw 5 provided at the other end of the cylinder body 1 to pivotally support the ball screw 5. A bearing member 6 and a ball nut 7 fixed to the piston 2 and screwed to the ball screw 5
A rotation angle detector 11 provided at the other end of the cylinder body 1 and detecting a rotation angle of the ball screw 5; a rod-side fluid chamber 1a in the cylinder body 1 divided by the piston 2; A direction switching valve 8 for supplying a working fluid to the head-side fluid chamber 1b and a controller 10 are provided.

The ball screw 5 is formed to have a length corresponding to the stroke of the piston 2, rotates according to the movement of the piston 2, and changes the length of the piston rod 3 fitted into the hollow portion 4. ing.

As the direction switching valve 8, a 4-port, 3-position electromagnetic switching valve is used. When one solenoid 9a is excited, the pump port P communicates with the one switching port A and the other switching port B communicates with the other switching port B. When the spool moves to the switching position communicating with the tank port T and excites the other solenoid 9b, the pump port P moves to the switching position where the other switching port B communicates with the other switching port B and the one switching port A communicates with the tank port T. The spool moves.

When both the solenoids 9a and 9b are not excited, the spool is set at a neutral position where the pump port P and the tank port T do not communicate with any of the switching ports A and B.

A pipe 81 communicating with a discharge port of a hydraulic pump (not shown) is connected to the pump port P of the direction switching valve 8, and a tank port T is connected to an oil tank (not shown). A pipe 82 is connected.

One switching port A is connected to a pipe 83 communicating with the rod-side fluid chamber 1a, and the other switching port B is connected to a pipe 84 communicating with the head-side fluid chamber 1b. .

The controller 10 includes a positioner 12
, An interface unit 13 and an amplifier unit 14.

The positioner section 12 includes a rotation angle detector 11
The position of the piston 2 with respect to the cylinder main body 1 is obtained based on the rotation angle detection signal 11s output from the controller 10 and a piston position signal 12s is output.

The interface unit 13 includes a piston position signal 12 s from the positioner unit 12, an operation range signal 15 s from an operation range setting unit 15 for setting the operation range of the piston 2, and an operation from a higher-level control system (not shown). An excitation command signal 13s is output based on the command signal 16s.

The amplifier section 14 includes an interface section 13
The excitation currents 10a and 10b for the solenoids 9a and 9b of the direction switching valve 8 are output based on the excitation command signal 13s from.

That is, in the positioning cylinder device shown in FIG. 1, the linear motion of the piston 2 is converted into the rotational motion via the ball screw 5 and the ball nut 7, and the rotation of the ball screw 5 detected by the rotation angle detector 11 is performed. Based on the angle, the position of the piston 2 with respect to the cylinder body 1 is determined in the positioner section 12 of the controller 10.

Next, when an operation command signal 16 s is output from the higher-level control system to the interface unit 13, the interface signal is output based on the piston position signal 12 s from the positioner unit 12 and the operation range signal 15 s from the operation range setting unit 15. The excitation command signal 13s is output from the unit 13 to the amplifier unit 14, and the excitation current 10a to one solenoid 9a or the excitation current 10b to the other solenoid 9b is output from the amplifier unit 14.

As a result, the spool of the directional control valve 8 moves, and a working fluid pressure is applied to the rod-side fluid chamber 1a or the head-side fluid chamber 1b of the cylinder main body 1, and the operation fluid pressure signal is responded to the operation command signal 16s. The piston 2 moves in the direction.

When the piston 2 moves to a position corresponding to the operation range signal 15s, the excitation command signal 13s is no longer output from the interface unit 13 to the amplifier unit 14, and the excitation current 10a, 9a, 9b from the amplifier unit 14 to the solenoids 9a, 9b. The output of 10b is interrupted.

As a result, the spool of the direction switching valve 8 is set to the neutral position, and the piston 2 stops.

Further, since the operating range of the piston 2 is based on the operating range signal 15s from the operating range setting device 15 to the interface unit 13, the operating range signal 15s
By changing the set value, the stroke end of the piston rod 3 can be easily and accurately changed.

FIG. 2 shows a second example of the embodiment of the positioning cylinder device of the present invention. In the drawing, the portions denoted by the same reference numerals as those in FIG. 1 represent the same components.

This positioning cylinder device includes a piston 2
And a hollow piston rod 3 extending outward from the piston 2 at one end of the cylinder body 1
A sensor support rod 21 penetrating through the piston 2 and disposed coaxially within the cylinder body 1;
And a magnetic sensor head 23 attached to the sensor support rod 21 so as to be located inside the piston rod 3 and detecting the relative position of the magnetic scale 22.
A direction switching valve 8 for supplying working fluid to the rod-side fluid chamber 1a and the head-side fluid chamber 1b; and a controller 24.

The controller 24 includes a positioner 25
And the interface unit 13 and the amplifier unit 1 described above.
And 4.

The positioner 25 determines the position of the piston 2 with respect to the cylinder body 1 based on a position detection signal 23s output from the magnetic sensor head 23, and outputs a piston position signal 12s.

That is, in the positioning cylinder device shown in FIG. 2, based on the displacement of the magnetic scale 22 detected by the magnetic sensor head 23, the positioner 25 of the controller 24
Is required.

Next, when an operation command signal 16 s is output from the upper control system to the interface unit 13, the interface signal is output based on the piston position signal 12 s from the positioner unit 25 and the operation range signal 15 s from the operation range setting unit 15. An excitation command signal 13s is output from the section 13 to the amplifier section 14, and an excitation current 10a to one solenoid 9a or an excitation current 10b to the other solenoid 9b is output from the amplifier section 14, and an operation command signal 16s The piston 2 moves in a direction corresponding to

When the piston 2 moves to a position corresponding to the operation range signal 15s, the excitation command signal 13s is no longer output from the interface unit 13 to the amplifier unit 14, and the excitation current 10a, 9a, 9b from the amplifier unit 14 to the solenoids 9a, 9b. 10b is interrupted and the piston 2
Stops.

Further, since the operating range of the piston 2 is based on the operating range signal 15s from the operating range setting unit 15 to the interface unit 13, the operating range signal 15s
By changing the set value, the stroke end of the piston rod 3 can be easily and accurately changed.

FIG. 3 shows a third embodiment of the positioning cylinder device according to the present invention. In the drawing, the portions denoted by the same reference numerals as those in FIG. 1 represent the same components.

In this positioning cylinder device, a motor 31 and a controller 32 are used instead of the direction switching valve 8 and the controller 10 in FIG.

The motor 31 is located at the other end of the cylinder body 1 and rotates the ball screw 5 in the circumferential direction.

The rotation angle of the ball screw 5 is detected by the rotation angle detector 11 via the rotation shaft of the motor 31.

The controller 32 includes the positioner section 12 described above, the interface section 33 and the amplifier section 3.
And 4.

The interface unit 33 includes a piston position signal 12 s from the positioner unit 12, an operation range signal 15 s from an operation range setting unit 15 for setting the operation range of the piston 2, and an operation from an upper control system (not shown). It is configured to output an energization command signal 33s based on the command signal 16s.

The amplifier unit 34 includes an interface unit 33
The motor 32 is configured to supply a current 32a to the motor 31 based on the power supply command signal 33s from the motor.

That is, in the positioning cylinder device shown in FIG. 3, based on the rotation angle of the ball screw 5 detected by the rotation angle detector 11, the positioner unit 12 of the controller 32
Is required.

Next, when an operation command signal 16 s is output from the higher-level control system to the interface unit 33, the interface signal is output based on the piston position signal 12 s from the positioner unit 12 and the operation range signal 15 s from the operation range setting unit 15. An energization command signal 33s is output from the unit 33 to the amplifier unit 34, and the motor unit 31
Current 32a is supplied to

As a result, the ball screw 5 rotates, and the piston 2 moves in a direction corresponding to the operation command signal 16s.

When the piston 2 moves to a position corresponding to the operation range signal 15s, the energization command signal 33s is not output from the interface section 33 to the amplifier section 34, and the energization of the current 32a from the amplifier section 34 to the motor 31 is stopped. Interrupted.

As a result, the ball screw 5 does not rotate, and the piston 2 stops.

Further, since the operating range of the piston 2 is based on the operating range signal 15s from the operating range setting unit 15 to the interface unit 33, the operating range signal 15s
By changing the set value, the stroke end of the piston rod 3 can be easily and accurately changed.

The positioning cylinder device of the present invention is not limited to the above-described embodiment, but has a configuration in which a normal solenoid valve or a servo valve is used as a direction switching valve instead of the proportional solenoid valve. Of course, other modifications can be made without departing from the spirit of the present invention.

[0055]

As described above, the positioning cylinder device of the present invention can provide various excellent effects as described below.

(1) In the positioning cylinder device according to the first aspect of the present invention, the position of the piston with respect to the cylinder body is obtained based on the rotation angle of the ball screw detected by the rotation angle detector, and the preset operating range is set. The operating fluid is supplied to the rod-side fluid chamber or the head-side fluid chamber in the cylinder body by exciting the solenoid of the directional control valve based on the signal and the operation command signal input from the outside. , The stroke end of the piston rod can be easily and accurately changed.

(2) In the positioning cylinder device according to the second aspect of the present invention, the position of the piston with respect to the cylinder main body is obtained based on the displacement of the magnetic scale in the piston rod detected by the magnetic sensor head, and is set in advance. Based on the operation range signal and an operation command signal input from the outside, the solenoid of the directional control valve is excited to supply the working fluid to the rod side fluid chamber or the head side fluid chamber in the cylinder body. By changing the set value, the piston rod stroke end can be easily and accurately changed.

(3) In the positioning cylinder device according to the third aspect of the present invention, the position of the piston with respect to the cylinder main body is obtained based on the rotation angle of the ball screw for moving the cylinder detected by the rotation angle detector and set in advance. Since the motor is operated based on the operation range signal and the operation command signal input from the outside, the stroke end of the piston rod can be easily and accurately changed by changing the set value of the operation range signal. .

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a first example of an embodiment of a positioning cylinder device of the present invention.

FIG. 2 is a conceptual diagram of a second example of the embodiment of the positioning cylinder device of the present invention.

FIG. 3 is a conceptual diagram of a third example of the embodiment of the positioning cylinder device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder main body 1a Rod side fluid chamber 1b Head side fluid chamber 2 Piston 3 Piston rod 5 Ball screw 7 Ball nut 8 Direction switching valve 9a Solenoid 9b Solenoid 10 Controller 11 Rotation angle detector 11s Rotation angle detection signal 15s Operation range signal 16s Operation Command signal 21 Sensor support rod 22 Magnetic scale 23 Magnetic sensor head 23s Position detection signal 24 Controller 31 Motor 32 Controller

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Kaoru Kaneko Inventor Kaoru Kato-ku 3-2-1-16 Toyosu, Tokyo Ishikawajima Harima Heavy Industries, Ltd. Toyosu General Office

Claims (3)

[Claims] 1. A cylinder body containing a piston, a hollow piston rod extending from the piston to one end of the cylinder body, and a piston that can be inserted into the piston rod and can be rotated in a circumferential direction. A ball screw fixed in the cylinder body, a ball nut fixed to the piston and rotating the ball screw in a circumferential direction with movement of the piston relative to the cylinder body, and a rotation angle detector for detecting a rotation angle of the ball screw A solenoid-operated directional switching valve capable of supplying working fluid to a rod-side fluid chamber and a head-side fluid chamber in a cylinder body divided by a piston, and a rotation angle detection signal from the rotation angle detector, A controller that excites the solenoid of the directional control valve based on the set operation range signal and an externally input operation command signal. A positioning cylinder device comprising a roller. 2. A cylinder body containing a piston, a hollow piston rod extending from the piston to one end of the cylinder body, and a piston penetrating the piston rod so as to be fitted into the piston rod and arranged in the cylinder body. A sensor support rod, a magnetic scale extending in the cylinder axis direction attached to the inner surface of the piston rod, and a magnetic sensor attached to the sensor support rod so as to be located inside the piston rod and detecting a relative position of the magnetic scale A sensor head, a directional switching valve of an electromagnetic switching type capable of supplying a working fluid to a rod-side fluid chamber and a head-side fluid chamber in a cylinder body divided by a piston, and a position detection signal from the magnetic sensor head, The solenoid of the directional control valve is set based on the set operation range signal and the operation command signal input from outside. A positioning cylinder device comprising: a controller that excites the magnetic field. 3. A cylinder body containing a piston, a hollow piston rod extending outwardly from the piston to one end of the cylinder body, and a piston that penetrates the piston rod so as to be fitted into the piston rod and that can rotate in a circumferential direction. A ball screw fixed in the cylinder body, a ball nut fixed to the piston and moving the piston in the axial direction as the ball screw rotates in the circumferential direction, and a motor rotating the ball screw in the circumferential direction. A rotation angle detector for detecting a rotation angle of a ball screw, and a controller for operating a motor based on a rotation angle detection signal from the rotation angle detector, a predetermined operation range signal, and an operation command signal input from outside. And a positioning cylinder device.