JPH0525005U - Arbitrary position locking device for gas cylinder - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a locking mechanism for a gas cylinder with high positioning accuracy without damaging the piston rod. [Composition] A cylinder and a piston capable of sliding airtightly in the cylinder are constrained, the relative rotation of the cylinder and the piston is restrained, and an axial center hole is formed in the piston body of the piston and the piston rod to close the tip of the piston rod. A ball nut is fixed to the end surface of the piston body on the opposite side of the piston rod, a brake case is formed on the cylinder head facing the ball nut, and a ball screw that engages with the ball nut is axially immovably and rotatably supported. Arbitrary position locking device for a gas cylinder equipped with a brake mechanism that restrains or releases the rotation of the ball screw.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a locking mechanism applied to positioning a gas cylinder such as an air cylinder that drives linearly.

[0002]

[Prior Art]

 As an arbitrary position locking mechanism of the gas cylinder, as shown in FIG. 2, a locking sleeve 04 and a locking chamber 05 are formed around the piston rod 03, and the locking sleeve 04 is used when the cylinder 01 and the piston 02 are positioned and locked. There is a mechanism that tightens with a pressurized fluid and holds it by frictional force with the piston rod 03. In FIG. 2, reference numeral 06 is a switching valve for piston operation.

[0003]

[Problems to be solved by the device]

 The above-mentioned conventional technique has the following problems. Since the piston rod was locked by tightening the sleeve with a sleeve, there was a risk of damaging the rod and reducing the sealing performance. Also, since it is an air cylinder, it is difficult to control the piston speed, and the position setting accuracy is low.

An object of the present invention is to provide a locking mechanism for a gas cylinder, which has high positioning accuracy without damaging the piston rod.

[0005]

[Means for Solving the Problems]

 In order to prevent damage to the seat surface of the piston rod, reduce the speed of the piston, and improve position setting accuracy, insert a ball screw / nut between the piston and the cylinder head that are constrained to rotate in the circumferential direction with an elliptical shape. A brake such as a clutch system is installed at the end, and the piston position is set by detecting the rotation angle of the brake rotor with friction plate.

[0006]

[Action]

 The linear motion of the piston is converted into the rotational motion of the ball screw by the ball nut, and the brake rotor with friction plate attached to the end of the ball screw shaft is slidably rotated to detect the rotational angle of the rotor and operate the brake stator at an arbitrary position. Lock to set the piston position.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIG. In the cylinder body 1-1 having a non-circular cross section such as a da circle, a piston body 2-1 having the same shape with a packing 7 provided on the outer peripheral portion is fitted. The piston body 2-1 is constrained from rotating and has a structure capable of sliding airtight in the axial direction. A cylinder head 1-2a is provided at the left end of the cylinder body 1-1, and a cylindrical piston rod 2-2 having a closed tip portion penetrates the head 1-2a, and the rod 2-2 is connected by a packing 8. Shield. A cylinder head 1-2b is provided at the right end of the cylinder body 1-1, and the head 1-2b has a ball screw 3-2 that engages with a ball nut 3-1 inserted in the piston body 2-1. It is rotatably supported via a bearing 6. An airtight brake case 1-3 is provided outside the cylinder head 1-2b for accommodating a brake 4 such as a clutch type mounted at the end of the ball screw 3-2.

The brake rotor 4-1a of the brake 4 is attached to the right end portion of the ball screw 3-2 and can be fixed in a rotationally fixed manner to the brake case 1-3 via a friction plate 4-1b. Is held. Further, the brake stator 4-2 engages with a spline 4-3 fixed to the case 1-3 side so as to be slidable in the axial direction, and is pressed toward the brake roller 4-1b side by a spring 4-4. .. A clutch opening electromagnetic coil 4-5 fixed to the brake case 1-3 side is provided on the outer peripheral portion of the brake stator 4-2, and a rotation angle is provided on the outer peripheral portion of the brake rotor 4-1a. The degree detecting sensor 5 is attached to the brake case 1-3 side.

Pipes 9 and 10 are attached to the cylinder heads 1-2a and 1-2b, respectively, and are connected to a gas supply / exhaust system facility (not shown). With the above configuration, when the piston 2 is moved, the electromagnetic coil 4-5 is excited, the brake stator 4-2 is separated from the brake rotor 4-1a, and the pressurized gas is supplied to either the pipe 9 or 10. Supply. At this time, the linear motion of the piston 2 is converted into the rotational motion of the ball screw 3-2 by the ball nut 3-1 fixed to the piston body 2-1 and the friction plate 4-attached to the brake rotor 4-1a. The piston 2 is moved at a low speed by the sliding resistance between 1b and the break case 1-3, and the amount of movement is detected by the sensor 5. When the piston 2 is stopped, the electromagnetic coil 4-5 is made non-excited at the required position, the brake stator 4-2 is pressed by the spring 4-5 toward the brake rotor 4-1a side, and is connected to the ball screw 3-. Bind 2 rotations.

[0010]

[Effect of the device]

 An arbitrary position locking device of a gas cylinder according to the present invention is a gas cylinder having a cylinder and a piston capable of sliding in an airtight manner in the cylinder. A piston rod is provided with an axial center hole that closes the tip of the piston rod, a ball nut is fixed to the end surface of the piston body opposite to the piston rod, a brake case is formed on the cylinder head facing the ball nut, and a screw is attached to the ball nut. The following effects are achieved by supporting the corresponding ball screw so that it cannot move axially and rotatably, and installing a brake mechanism that restrains or releases the rotation of the ball screw in the brake case.

The movement of the piston is slowed down and the position setting accuracy is improved. When locking, the piston rod or piston body will not be damaged and airtightness will not be impaired.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional device.

[Explanation of symbols]

 1-1 Cylinder body 1-2b Cylinder head 1-3 Brake case 2-1 Piston body 2-2 Piston rod 3-1 Ball nut 3-2 Ball screw 4-1a Brake rotor 4-1b Friction plate 4-2 Brake stator 4- 5 Clutch release electromagnetic coil 5 Rotation angle detection sensor

Claims (1)

[Scope of utility model registration request] 1. A gas cylinder having a cylinder and a piston capable of sliding airtightly in the cylinder, wherein relative rotation of the cylinder and the piston is restrained, and a piston body of the piston and a piston rod are closed at a tip of the piston rod. A central hole is provided in the axial direction, and a ball nut is fixed to the end surface of the piston body opposite to the piston rod,
A brake case is formed on a cylinder head facing the ball nut, a ball screw screwed on the ball nut is axially immovably and rotatably supported, and a brake mechanism for restraining or releasing the rotation of the ball screw is provided on the brake case. Arbitrary position locking device for gas cylinder characterized by being installed.