JPH045785Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention includes a piston that is slidably fitted into the cylinder body, and an incompressible fluid that is enclosed in the cylinder body.
This invention relates to a shock absorber that applies a retraction-direction load applied to a piston rod to an incompressible fluid and damps it by a damping effect when the incompressible fluid passes through an orifice in a cylinder body.

[Conventional technology]

This type of shock absorber is generally used in industrial machinery to stop a moving workpiece while cushioning it. Conventionally, to electrically detect the stoppage of a workpiece, the workpiece was directly detected using a phototube or the like.

[Problem that the idea aims to solve]

For this reason, there are problems such as requiring a large installation space as a whole and causing detection errors due to vibration of the workpiece, etc. The purpose of this invention is to solve these problems and make it possible to detect work stoppage with the shock absorber itself, thereby reducing the installation space and simplifying handling.The detection device is also extremely simple and inexpensive. The aim is to be able to provide the

[Means to solve the problem]

As shown in the illustrative drawing, the shock absorber of the present invention has a male thread 7 provided on the outer peripheral surface of a cylinder body 1, and a pair of lock nuts 1 screwed onto the male thread 7.
0, the switch mounting piece 24 is removably attached to the outside of the cylinder body 1 by holding the base 25 of the switch mounting piece 24, and a limit switch 26 with a switch actuating protrusion 27 protruding so as to be movable forward and backward is attached to the tip of the switch mounting piece 24. It is also characterized in that a cap 6 is attached to the tip of the piston rod 5 for retracting the switch operating protrusion 27 when engaged with the switch operating protrusion 27.

[Effect]

The workpiece is the cap 6 at the tip of the piston rod 5.
When the piston rod 5 is retracted while being cushioned and the cap 6 engages with the switch actuating protrusion 27 of the limit switch 26 to move it backward, the limit switch 26 is turned on and the workpiece is cushioned to a predetermined position. is detected. The detection position can be easily changed by adjusting the position where the switch mounting piece 24 is fixed by the pair of lock nuts 10 in the axial direction of the cylinder body 1.

【Example】

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. In FIG. 1, the cylinder body 1 of this shock absorber has an inner tube (not shown) in an outer tube 2, for example, in
Similar to the conventional one disclosed in Japanese Patent No. 33274, these tubes are arranged concentrically, and the openings at both ends of both tubes are closed by a head cover 3 and a rod cover 4. A piston is slidably fitted in the inner tube as in the conventional case, and a return spring is housed to bias the piston toward the rod cover 4. Also, between the inner tube and the outer tube 2, a return spring is housed. A storage chamber is formed, and a number of orifices are bored in the peripheral wall of the inner tube, spaced apart in the axial direction of the inner tube, for introducing the incompressible fluid (for example, oil) into the storage chamber while squeezing it. There is. When the piston rod 5 retracts, a damping effect is provided by the damping effect when the incompressible fluid passes through the orifice. A cap 6 is screwed onto the tip (outer end) of the piston rod 5. A male thread 7 is formed on the outer peripheral surface of the outer tube 2, and a mounting nut 8 is screwed into this male thread 7. Furthermore, a pair of lock nuts 10 are screwed into the male screw 7 at the end thereof on the rod cover 4 side. Then, use these lock nuts 10 to attach the switch mounting piece 2.
A switch mounting piece 24 is removably attached to the outside of the cylinder body 1 by sandwiching the holed base 25 of No. 4. This switch mounting piece 2
At the tip (upper end) of 4, there is a switch actuation protrusion 2.
A mechanical limit switch 26 is attached with bolts and nuts. A roller 28 is pivotally supported at the lower end of the switch operating protrusion 27. When the work collides with the cap 6, the piston rod 5 is retracted while being buffered, and the cap 6 collides with the rod cover 4 and stops, the cap 6 engages with the roller 28 and the switch actuating protrusion 27 is lifted (retracted). ), it is detected that the limit switch 26 is turned on and the workpiece is stopped. The detection position can be adjusted in the axial direction of the cylinder body 1 by loosening the lock nut 10 and changing the fixed position of the switch mounting piece 24.

[Effect of the idea]

According to the shock absorber of the present invention, the stoppage of the workpiece can be detected by the shock absorber itself, so that the installation space can be reduced and the handling can be simplified. Furthermore, since the detection position can be easily adjusted and the detection device is simple and uses a limit switch, it can be provided at low cost. Furthermore, the above detection can be performed simply by adding a pair of lock nuts, a switch mounting piece, and a limit switch to a ready-made shock absorber.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a front view thereof. 1... Cylinder body, 6... Cap, 7...
Male thread, 10... lock nut, 24... switch mounting piece, 25... base, 26... limit switch, 27... switch operating protrusion.

Claims (1)

[Scope of utility model registration request] A piston is slidably fitted into the cylinder body, and an incompressible fluid is enclosed, and a load applied to the piston rod in the retraction direction is applied to the incompressible fluid, and the incompressible fluid presses the orifice in the cylinder body. In a shock absorber that provides damping by the damping effect when the cylinder passes, a male thread 7 is provided on the outer peripheral surface of the cylinder body, and a pair of lock nuts 10 screwed into the male thread 7 are used to attach the switch mounting piece 2.
A switch mounting piece 24 is removably attached to the outside of the cylinder body 1 by sandwiching the base 25 of the cylinder body 1, and a limit switch 26 having a switch actuating protrusion 27 protruding so as to be freely advanced and retractable is attached to the tip of the switch mounting piece 24. A shock absorber characterized in that a cap 6 is attached to the tip of the piston rod for retracting the switch operating protrusion 27 when engaged with the switch operating protrusion 27.