JPH0729282Y2 - Rocking cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an oscillating cylinder that causes a piston rod to perform a combined movement of sliding and rotating.

[Prior Art] The inventors of the present invention have previously proposed a composite actuator including a cylinder type actuator, an oscillating type actuator, and a piston rod brake device of the cylinder type actuator described in Japanese Patent Application No. Proposed by No. 190596.

In the previously proposed composite actuator, when the brake device grips or releases the piston rod, the piston rod can be caused to perform a combined motion of linear reciprocating movement by the cylinder type actuator and rotational swinging by the swinging type actuator. it can.

However, in the previously proposed composite actuator, the brake device is provided separately from the swing type actuator or is incorporated in the swing type actuator, so that the entire actuator becomes large and the cost is high and the installation space is large. There is a problem that becomes large.

[Problem to be Solved by the Invention] An object to be solved by the present invention is to provide a small and inexpensive rocking cylinder by causing a brake device to perform a combined movement of sliding and rotating. .

[Means for Solving the Problems] In order to solve the above problems, an oscillating cylinder of the present invention includes a cylinder type actuator and a piston rod brake device of the cylinder type actuator, and the brake device is a spiral type. A body fixed to the cylinder of the cylinder type actuator, a brake mechanism capable of sliding in the body and holding the piston rod, and a guide pin guided by the rocking guide. It features a brake piston.

[Operation] When the brake mechanism grips the piston rod while the cylinder-type actuator is sliding, the brake piston is guided by the spiral swing guide of the body and rotates while sliding, so that the piston rod does not slide. Performs a combined movement with rotation.

Therefore, since a rocking type actuator is not required, a cylinder that performs a combined motion of sliding and rotating can be made small and inexpensive.

When the piston rod is released from the grip of the brake device, the piston rod slides again.

[Embodiment] FIGS. 1 to 3 show an embodiment of the present invention. This swing cylinder comprises a cylinder type actuator 1 and a brake device 2 for gripping a piston rod, which will be described later. Are integrally connected in the axial direction of the piston rod.

The cylinder type actuator 1 includes a pressure chamber 6 defined by pistons 5 from ports 4a and 4b of a cylinder, which is schematically shown.
The pressure chamber is supplied to and discharged from a and 6b, and the piston 5 and piston rod 7
It consists of a well-known fluid pressure cylinder that slides.

The body 10 of the brake device 2 schematically shown includes a pressure chamber 13a formed by a brake piston 11 having a built-in brake mechanism 12.
And 13b, and ports 14a and 14b for supplying and discharging the pressure fluid to and from these pressure chambers are opened.

FIG. 3 shows an example of the brake mechanism 12 described above. The brake piston 11 is divided into a brake chamber 17 and a release chamber 18 by a brake cam 16 that slides inside, and a brake spring 19 is contracted in the brake chamber 17. A guide pin 20 extending in the radial direction is provided with a pressure air supply port 21 opening to the release chamber 18, and the guide pin 20 passes through a spiral swing guide 23 formed in the body 10 and has a diameter thereof. It extends in the direction (see FIG. 2). Therefore, the brake piston 11
The guide pin 20 and the swing guide 23 perform a combined movement of sliding and rotating.

Brake arms 25 provided in the release chamber 18, ..., near the base end are swingably supported by a bearing portion formed in the brake piston 11, and a roller that abuts the cam surface 16a of the brake cam 16 at the base end Further, a concave portion into which the convex portion of the shoe holder 26 is fitted is provided, and a brake shoe 27 for pressing the piston rod 7 to grip the shoe holder 26 is provided.

The brake mechanism 12 slides the brake cam 16 by the urging force of the brake spring 19 compressed in the brake chamber 17,
The cam surface 16a expands the diameter of the rollers of the brake arm 25, ..., The brake shoe 27 presses and holds the piston rod 7, and the pressure air supplied from the supply port 21 to the release chamber 18 causes the brake cam 16 to move in the opposite direction. It is configured as an exhaust brake that is slid to the left to release the grip of the piston rod 7 by the brake shoe 27. However, the brake mechanism 12 is not limited to the exhaust brake, and may be an air supply brake that holds the piston rod 7 by the pressure air supplied from the supply port 21, or a piston using a solenoid or an electrostrictive element. It is also possible to grasp the rod 7.

The direction switching valve 31 that supplies and discharges pressure air to the cylinder type actuator 1 discharges the pressure air in the pressure chambers 6b and 6a by alternately exciting the solenoids 31a and 31b, and the solenoids 31a and 31b are both de-energized. Pressure chambers 6a, 6 in the switching position
The directional control valve 32, which is composed of a center pressure type three-position valve that supplies pressurized air to b, supplies and discharges pressurized air to and from the brake device 2. A two-position valve that supplies and discharges air, and a directional valve 33 that supplies and discharges pressurized air to and from the brake mechanism 12.
Release chamber 1 by energizing and de-energizing solenoid 33a
It is composed of a two-position valve that supplies and discharges pressurized air to 8.

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

FIG. 1 shows that the solenoids of the directional control valves 31, 32, 33 are all in a non-excited state, and the brake piston 11 is at the right stroke end due to the pressure air supplied to the pressure chamber 13b.
The piston rod 7 and the piston 5 gripped by the brake mechanism 12 are also at the right stroke end, and since the air pressures in the pressure chambers 6a and 6b are equal, the piston 5 and the piston rod 7 are stopped at that position.

When the solenoids 31a and 33a are excited in this state, the gripping of the piston rod 7 by the brake mechanism 12 is released and the air in the pressure chamber 6b is discharged to the outside, so that the piston 5 and the piston rod 7 move left in the figure. However, the brake piston 11 is stopped.

When the solenoids 31a and 33a are de-energized and the solenoid 32a is energized while the piston 5 is moving to the left, the brake mechanism 12 grips the piston rod 7 and the brake piston 11 is driven by the pressure air supplied to the pressure chamber 13a. At the same time, the guide pin 20 rotates to the left by being guided by the spiral rocking guide 23, so that the piston rod 7 performs a combined movement of sliding and rotation.

Next, when the solenoids 31a and 33a are energized and the solenoid 32a is deenergized, the brake piston 11 returns to its original position by the pressurized air supplied to the pressure chamber 13b, and the piston rod 7 moves to the left in the drawing again. By sliding, the solenoids 31a, 33a and 32a are subsequently excited and deenergized repeatedly, whereby the piston rod 7 repeats the sliding motion A and the combined motion B of sliding and rotation (see FIG. 4).

Since the movement of the piston 5 and the piston rod 7 to the right in the figure due to the excitation and de-excitation of the solenoid 31b instead of the solenoid 31a is the same as in the leftward direction, detailed description thereof will be omitted.

[Effects of the Invention] The swing cylinder of the present invention can make the piston rod of the cylinder type actuator perform a combined movement of sliding and rotation without using the swing type actuator. It can be made inexpensive.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention, FIG. 2 is a plan view of an essential part of the same, FIG. 3 is a vertical sectional front view showing an example of a brake mechanism, and FIG. 4 is an operation explanatory view of the embodiment. is there. 1 ... Cylinder type actuator, 2 ... Brake device, 7 ... Piston rod, 10 ... Body, 11 ... Brake piston, 12 ... Brake mechanism, 20 ... Guide pin, 23 ... Swing guide.

Claims (1)

[Scope of utility model registration request] 1. A body comprising a cylinder type actuator and a piston rod braking device of the cylinder type actuator, wherein the braking device has a spiral rocking guide and is fixed to a cylinder of the cylinder type actuator. And a brake piston which is slidable in the body and has a brake mechanism for gripping the piston rod and a guide pin guided by the swing guide.