JPS629008A - Actuator - Google Patents

Abstract

PURPOSE:To improve control accuracy of location, by screwing an adjusting rod having a threaded portion into a piston, and adjusting axial movement of the piston with rotation of the adjusting rod CONSTITUTION:The circumferential wall of a cylinder 1 is provided with ports 6 and 7 used for supplying pressurized fluid into liquid chambers 4 and 5. A sleeve 12 is fixed into the aperture 11 of the central portion of a piston 2 by screws 13, and an adjusting rod 15 is inserted into the cylinder 1 rotatably by penetrating the end surface of the cylinder, opposite to a piston rod 3. The adjusting rod 15 is rotated by a motor 16, so that the piston 2 accompanied by the sleeve 12 fixed thereto and screwed with a threaded portion 14 and the piston rod 3 can be moved into axial direction finely and accurately. Thereby, control accuracy of location is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seven-cut unit for driving heavy objects.

(Prior Art) Conventionally, as this type of seven-actuator, there is one that moves a piston in a cylinder using fluid pressure to drive a heavy object. This can generate a force of 1 ton or more using a hydraulic circuit, for example, and is used in large parts manufacturing factories.

(Problems to be solved by the invention) However, such conventional actuators for driving heavy objects have a structure that generates a large force using fluid pressure, making precise position adjustment difficult and poor control accuracy. There was a problem.

(Means for Solving the Problems) The present invention has been made in view of these conventional problems, and it is possible to precisely adjust the position of a 7-cut unit for driving heavy objects using fluid pressure. In order to
An adjusting rod having a threaded portion is screwed onto the piston, and the axial movement of the piston is adjusted by rotating the adjusting rod.

(Example) Hereinafter, an example of the present invention shown in the accompanying drawings will be described.

First, to explain the configuration, 1 is a cylinder, and a piston 2 is housed inside the cylinder. This piston 2 is slidable in the axial direction, but its rotation is restricted.

A central portion of the piston 2 extends toward the negative side in the shape of a sleeve to form a piston rod 3 integral with the piston 2.

Boats 6 and 7 are provided on the peripheral wall of the cylinder 1 to supply pressurized fluid (air or hydraulic oil) to the liquid chambers 4 and 5 formed on both sides of the piston 2, respectively. Fluid source 9 and tank 1 via directional valve 8
Connected to 0.

Inside the opening ll formed in the center of the piston 2, a sleeve 12 with a female thread formed on the inner diameter has a plurality of screws 13.
An adjusting rod 15, which is fixed to the sleeve 12 and has a threaded portion 14 that is screwed into the sleeve 12, is rotatably inserted into the cylinder z through the end face of the cylinder opposite to the piston rod 3, and in the axial direction. It is placed so that it does not move. This adjustment rod 15 is rotationally driven by a motor 16 installed outside the cylinder l.

In order to ensure the airtightness of the liquid chambers 4 and 5 in the cylinder 1, sealing members such as O-rings are installed on both side walls of the cylinder 1 where the piston rod 3 and adjustment rod 15 slide and on the sliding part of the piston 2. It is located.

Next, the operation of the above embodiment will be explained.

First, from the fluid source 9 to the directional valve 10 and the boat 6.7
By supplying pressurized fluid to the liquid chamber 4 or 5 in the cylinder 1 through the piston 2, the piston 2 moves in the axial direction and drives a heavy object through the piston rod 3. At this time, when the motor 16 has driven the zero-weight object, which rotates in synchronization with the movement of the piston 2 due to the fluid pressure, to almost the target position, the motor 16 switches the directional control valve 8 to stop the movement of the piston 2 due to the fluid pressure. . Next, by rotating the adjusting rod 15 with the motor 16, the piston 2 and the piston rod 3, which have the sleeve 12 screwed into the threaded portion 14 fixed thereon, are finely and precisely moved in the axial direction, and their positions are precisely adjusted. Adjust to. Thereby, the driven object is accurately positioned.

Although the embodiments have been described above, the present invention is not limited to these. For example, in the above embodiments, the threaded portion of the adjustment rod is screwed into the sleeve that is removably attached to the piston, but Alternatively, the piston may be formed with a threaded portion and the adjustment rod may be screwed into the threaded portion.

(Effects of the Invention) As described above, according to the present invention, in an actuator that moves a piston in a cylinder using fluid pressure to drive a heavy object, an adjustment rod having a threaded portion is screwed to the piston, and the adjustment Since the axial movement of the piston is adjusted by rotating the rod, the control accuracy for one position is improved and positioning can be performed accurately.

[Brief explanation of the drawing]

The drawing is a sectional view of an actuator according to an embodiment of the present invention. ■---Cylinder, 2-111 piston, 3-111 piston rod. 4.5---Single liquid chamber, 6.7---Boat, 8-11 One-way switching valve. 9--One fluid source, 10--One tank, 11--One opening, 12--Sleeve, 13--One screw, 14--Threaded portion, 15--One adjustment. Lofud, 16---- motor.

Claims (1)

[Claims] In an actuator that drives a heavy object by moving a piston in a cylinder using fluid pressure, an adjusting rod having a threaded portion is screwed onto the piston, and the axial movement of the piston is adjusted by rotating the adjusting rod. An actuator characterized by: