JPH0882305A - Fluid pressure cylinder - Google Patents

Abstract

(57) [Summary] [Object] To provide a fluid pressure cylinder capable of stopping the piston rod 7 in multiple stages. [Structure] Cylinder block 1 has a cylinder hole 2 in the center.
Guide holes 3 are formed on both sides of the cylinder hole 2, and the tip of a piston rod 7 connected to a piston 6 slidably fitted in the cylinder hole 2 is slidably fitted in both guide holes 3. In the fluid pressure cylinder in which the leading end of the guide bar 9 is connected by the connecting plate 10, the stopper 15 for advancing and retracting into the guide hole 3 by driving the actuator 13 is provided on the side of the cylinder block 1. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic cylinder capable of stopping a piston rod in multiple stages.

[0002]

2. Description of the Related Art Conventionally, in order to stop the piston rod of a fluid pressure cylinder in multiple stages, a method of connecting the fluid pressure cylinder in multiple stages or tightening the piston rod with a brake has been used. When the cylinders are connected in multiple stages, the total length becomes extremely long and the installation location is restricted, and the method of tightening the piston rod with the brake has a problem that the stop position is not constant.

[0003]

The problem to be solved by the present invention is that the conventional method requires a longer overall length, or
That is, the stop position is not constant.

[0004]

As a means for solving the above-mentioned problems, the invention of claim 1 forms a cylinder hole in the center of a cylinder block and guide holes on both sides of the cylinder hole. In the fluid pressure cylinder in which the tip of the piston rod connected to the piston that is slidably fitted to the end and the tip of the guide bar that is slidably fitted to both guide holes are connected by the connecting plate, to the side of the cylinder block A stopper is provided to move the actuator into and out of the guide hole by driving the actuator. According to the invention of claim 2, in the invention of claim 1, a plurality of stoppers are stacked in parallel to the axial direction of the guide hole. In the invention of claim 3, in the invention of claim 3, the stopper slides on a guide block fixed to the cylinder block. It has a configuration which is engaged freely fitted.

[0005]

The present invention has the above-mentioned structure. According to the invention of claim 1, when the piston rod retracts, the guide bar abuts against the stopper that has advanced into the guide hole and stops. The piston rod can be accurately stopped at an arbitrary position by disposing the stopper in the guide hole, and the stop of the piston rod at that position can be released by retracting the stopper from the guide hole. The piston rod can be stopped in multiple stages by advancing a desired stopper into the guide hole, and the invention of claim 3 advances the stopper into the guide hole from a plurality of surfaces of the cylinder block to move the piston rod. It can be stopped in multiple steps at fine intervals.

[0006]

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

FIG. 1 shows a first embodiment of the present invention, in which 1
Is a cylinder block, and a cylinder hole 2 is provided at the center thereof.
However, guide holes 3 and 3 are provided on both sides of the guide hole 3 in parallel with each other.

A rod cover 4 is provided at the upper end of the cylinder hole 2.
However, the end cover 5 is attached to the lower end,
A piston rod 7 connected to a piston 6 slidably fitted in the cylinder hole 2 protrudes upward through the center of the rod cover 4, and from ports (not shown) formed in the lower part and the upper part of the cylinder hole 2. The piston 6 and the piston rod 7 are vertically moved by alternately repeating inflow and outflow of a working fluid such as air and oil.

A metal 8 is fitted in each of the guide holes 3, a guide bar 9 is slidably fitted in the metal 8, and a connecting plate 10 is inserted at the tips of both guide bars 9 and the piston rod 7. It is passed and fixed by bolts 11, and the vertical movement of the piston rod 7 causes the guide bars 9, 9
Move up and down as a unit.

The above is a known hydraulic cylinder with a guide, which has high rigidity and the advantage that the piston rod 7 does not rotate. In this embodiment, the bottom plate 12 is attached to the lower surface of the cylinder block 1. Four actuators 13a, 13b, 13c, 13d such as single-acting air cylinders are stacked on the right protrusion, and each actuator 13a, 13b, 13c, 13
The rod 14 of d has stoppers 15a, 15b, 15c,
15d is connected.

The lowermost stopper 15a slides on the bottom plate 12, and the upper stoppers 15b, 15c, 15d slide on the lower stoppers 15a, 15b, 15c, respectively. In the state in which 14 is retracted, each stopper 15a, 15b, 15c, 15d
Shows the guide hole 3 from the window hole 16 formed by breaking the side wall of the cylinder block 1 as shown by the solid line in the figure, and when the rod 14 moves forward, as shown by the chain line in the figure,
It is adapted to advance into the inside of the guide hole 3 and come into contact with the lower end of the guide bar 9.

Next, the operation of this embodiment will be described.

All the stoppers 15a, 15b, 15c,
When 15d is retracted, the piston rod 7
As shown by the solid line in the figure, the piston 6 stops at the lowermost position where it hits the end cover 5, and the stopper 1 at the lowermost stage is stopped.
When 5a slides on the bottom plate 12 and advances into the guide hole 3, it stops at the position where the guide bar 9 abuts its upper surface, and the second stopper 15b from the bottom and the lowermost stopper 15a move above the bottom plate 12. When sliding and advancing into the guide hole 3, the guide bar 9 stops at the position where it abuts on its upper surface, and the third stopper 15c from the bottom, the second stopper 15b, and the lowermost stopper 15a move above the bottom plate 12. When sliding and advancing into the guide hole 3, the guide bar 9 stops at the position where it abuts on the upper surface thereof, and the uppermost stopper 15d and the third stopper 1
5c, the second stopper 15b and the lowermost stopper 15
When a slides on the bottom plate 12 and advances into the guide hole, the guide bar 9 stops at a position where it abuts on the upper surface thereof. Stop at multiple stages.

In this embodiment, the stoppers 15a, 1
Since the guide bar 9 is received in a state where 5b, 15c and 15d are stacked, there is an advantage that a large load can be endured.

FIG. 2 shows a second embodiment of the present invention, in which a fluid pressure cylinder with a guide is the same as the first embodiment,
Portions having the same configuration are denoted by the same reference numerals.

A guide block 16 is fixed to the left side surface of the cylinder block 1, two upper and lower actuators 13a and 13b are attached to its end surface, and the guide block 16 is fixed to the right side surface of the cylinder block 1. Actuator 13c is attached, and a guide block (not shown) is fixed to the lower right side of the front surface of the cylinder block 1 so that the actuator 13c is fixed.
d is attached.

Each actuator 13a, 13b, 13
Stoppers 15a, 15b, 15c and 15d guided by a metal 17 are connected to the rods 14 of c and 13d so as to move forward and backward from the window hole 18 into the guide hole 3, as shown by the chain line in the figure. The guide bar 9 comes into contact with the stoppers 15a, 15b, 15c, 15d that have advanced into the guide hole 3 so that the stop positions of the piston rod 7 and the connecting plate 10 are determined.

In this embodiment, the stoppers 15a, 15b, 1
Since 5c and 15d are made to advance into the guide hole 3 from a plurality of surfaces of the cylinder block 1, there is an advantage that the piston rod 7 can be stopped in multiple steps at fine intervals.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a second embodiment of the present invention.

[Explanation of symbols]

 1: Cylinder block 2: Cylinder hole 3: Guide hole 6: Piston 7: Piston rod 9: Guide bar 10: Connecting plate 13: Actuator 15: Stopper 16: Guide block

Claims (3)

[Claims] 1. A cylinder hole is formed in the center of a cylinder block, and guide holes are formed on both sides of the cylinder hole, respectively.
A fluid pressure cylinder in which a tip of a piston rod connected to a piston slidably fitted in the cylinder hole and a tip of a guide bar slidably fitted in both guide holes are connected by a connecting plate, A fluid pressure cylinder characterized in that a stopper is provided on the side of the block to move into and out of the guide hole by driving an actuator. 2. The fluid pressure cylinder according to claim 1, wherein a plurality of the stoppers are stacked in parallel with the axial direction of the guide hole and are slidable with respect to each other. 3. The fluid pressure cylinder according to claim 1, wherein the stopper is slidably fitted to a guide block fixed to the cylinder block.