JPH0142642Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a piston stroke sensor fixture that is attached to a fluid pressure cylinder.

[Background Art] Today, fluid pressure cylinders are widely used as means for controlling the operation of equipment using fluid pressure, such as air pressure or oil pressure.

On the other hand, the operating status of this fluid pressure cylinder is increasingly detected based on the position information of the piston stroke, and the detected output is increasingly used as a signal for controlling the operation of the above-mentioned equipment and other devices.

In this case, as a means for detecting position information of the piston stroke, a piston stroke sensor consisting of one or more reed switches is attached to a predetermined position on the outer circumference of the cylinder body,
This responds to the magnet attached to the piston sliding inside the cylinder, and outputs a signal according to the piston stroke.

As mentioned above, the piston stroke sensor can be fixed at any position on the cylinder body.
A structure disclosed in Utility Model Application Publication No. 55-56902 has been proposed.

That is, holes are formed at both ends of the steel strip, the steel strip surrounds the cylinder body and the piston stroke sensor mounted on the cylinder body, and the bolt located above the piston stroke sensor is inserted into the steel strip. A part of the steel strip is bent by pressing the tip of the parallel part of the tightening piece, which is inserted into holes formed at both ends of the bolt, and pressed down by a nut screwed onto the bolt. By applying tension, the piston stroke sensor is tightly bound to the cylinder body.

However, in the above-mentioned structure of the fixing device, since the tightening piece is constructed by simply bending a flat plate, the strength against the expansion force in the direction of pushing the parallel parts of the tightening piece apart is low, and the reaction force generated on the steel strip during binding is low. There are disadvantages such as yielding and deformation, which tends to reduce the binding force, and the piston stroke sensor being displaced from a predetermined position in the axial direction of the cylinder body due to vibrations during operation of the cylinder body.

The present inventor has found that as a result, the detection of the piston stroke becomes inaccurate, causing serious problems such as causing malfunction of equipment that uses this detection output as a control signal.

[Object of the invention] An object of the invention is to provide a piston stroke sensor attachment that can securely fix a piston stroke sensor to a cylinder body.

[Summary of the invention] The invention consists of attaching a cap to a U-shaped piece into which a part of the steel band surrounding the cylinder body and piston stroke sensor is inserted, and which presses the steel band to generate a binding force. By forming ribs on the parallel parts of the U-shaped pieces in accordance with the above, the strength against the expansion force that acts in the direction of pushing and expanding the parallel parts of the U-shaped pieces is increased, and a reduction in the binding force due to the steel strip is prevented. The above object is achieved by making it possible to do so.

[Example] Fig. 1 is an external view of a piston stroke sensor mounting device according to an embodiment of the present invention when installed, and Fig. 2 is a view seen from the direction indicated by the line - in Fig. 1. .

FIG. 3 is a perspective view of a series of parts that make up the piston stroke sensor fixture.

In FIGS. 1 and 2, the cylinder body 1
A piston stroke sensor 2 is placed at a predetermined position on the outer periphery of the piston stroke sensor 2, and a lead wire 3 is provided to the piston stroke sensor 2.

The cylinder body 1 and the piston stroke sensor 2 are surrounded by a steel strip made of, for example, thin stainless steel, which is fixed at both ends to a connecting piece 10 having a screw hole 11 formed in the center, as shown in FIG. 20, the connecting piece 10 is surrounded by a steel strip 2
The U-shaped piece 30 is inserted between the parallel parts (legs) 31 and 32 of the U-shaped piece 30 so as to be movable in the vertical direction with both ends of the U-shaped piece 30 bent.

A rib 31 is provided on the side surface of the parallel portion 31 of the U-shaped piece 30.
1 and 312, and ribs 321 and 322 are formed on the side surfaces of the parallel portion 32 to face the ribs 311 and 312, respectively, to increase the strength against bending of the parallel portions 31 and 32,
The structure is such that both ends of the steel strip 20 are guided.

A through hole 33, which is slightly larger than the screw hole 11 formed in the connecting piece 10, is formed in the upper center of the U-shaped piece 30 so as to align with the screw hole 11.

Furthermore, a cap 40 is attached to the upper part of the U-shaped piece 30.
are crowned, and the parallel parts 31 and 3 of the U-shaped piece 30
The steel strip 20 is reinforced so as to have sufficient strength against the reaction force of the steel strip 20 acting in the direction of pushing and expanding the steel strips 20. During assembly, the cap 40 can be integrated with the U-shaped piece 30 by welding or the like.

The through hole 3 is located in the center of the cap 40.
A through hole 41 having the same diameter as the through hole 33 is formed at a position that matches (aligns with) the through hole 33.

FIG. 4 is a plan view of the cap 40 attached to the U-shaped piece 30, viewed from below, and FIG. 5 is a cross-sectional view of the portion indicated by the line - in FIG. 4.

Furthermore, the U-shaped piece 30 and the cap 40
A bolt 50 is screwed into the threaded hole 11 of the connecting piece 10 through the through holes 33 and 41 formed in each, and the tip 51 is abutted against the upper part of the piston stroke sensor 2 via the contact plate 60. It is said that

Next, the operation of this embodiment will be explained.

Connect the piston stroke sensor 2 to the cylinder body 1
When fixing to the cylinder body 1, the connecting piece 10 connecting the steel strip 20 surrounding the cylinder body 1 and the cylinder body 1
After inserting the piston stroke sensor 2 between the connecting piece 10, an integrated U-shaped piece 30 and a cap 40 are attached to the connecting piece 10. next,
The bolt 50 is screwed into the screw hole 11 of the connecting piece 10 through the through holes 41 and 33 of the cap 40 and the U-shaped piece 30, so that the tip end 51 of the bolt 50 is aligned with the piston stroke sensor 2 relative to the connecting piece 10. Rotate it so that it sticks out to the side.

At this time, the tip 51 of the bolt 50 is connected to the contact plate 60.
Since the connecting piece 10 is in contact with the piston stroke sensor 2 through the piston stroke sensor 2, the connecting piece 10 is moved in the direction away from the piston stroke sensor 2, surrounds the piston stroke sensor 2 and the cylinder body 1, and is fixed at both ends to the connecting piece 10. The stretched steel strip 20 is tensioned, and the piston stroke sensor 2 is fixedly bound to the cylinder body 1.

As a result, the parallel portion 3 formed in the U-shaped piece 30
1 and the tip of the parallel part 32, the steel strip 20 is pressed in a direction in which it is bent inward from the tangential direction to the cylinder body 1, and a larger tension is generated in the steel strip 20, and the piston stroke sensor 2 It is securely fixed to the main body 1.

At this time, the steel strip 20 tries to return to a straight line in the tangential direction to the cylinder body 1, and a large expansion force is applied to the U-shaped piece 30 in a direction that pushes the parallel portions 31 and 32 apart. A cap 40 attached to the U-shaped piece 30 and a parallel part 3
1. Ribs 311, 312 formed on the parallel portion 32
Due to the reinforcing action of the ribs 321 and 322, deformation and lateral displacement of the steel strip 20 are prevented, and a reduction in the binding force is avoided.

In this way, the piston stroke sensor 2
is securely fixed to the cylinder body 1, preventing the piston stroke sensor 2 from shifting from a predetermined position on the cylinder body 1, and preventing equipment malfunctions caused by the piston stroke sensor 2 shifting from the predetermined position. .

Further, the parallel parts 31 and 32 of the U-shaped piece 30
The length of the steel strip 20 in close contact with the cylinder body 1 in the circumferential direction is increased by the tip of the cylinder body 1, and as a result of the binding force applied to the cylinder body 1 being dispersed, deformation of the cylinder body 1 is also prevented.

On the other hand, when moving the piston stroke sensor 2 in the axial direction of the cylinder body 1, the bolt 5
0 in the opposite direction to the above-mentioned bonding operation, and the steel band 2
This can be done quickly by relaxing 0.

It should be noted that the present invention is not limited to the above embodiments, and various other modifications are possible.

For example, the steel strip may be wound not only over the cylinder body but also over the tie rod.

Furthermore, the U-shaped piece and the cap may be assembled separately during assembly.

[Effects] (1) Since the cap is attached and reinforced to the U-shaped piece that tensions the steel strip, deformation of the parallel part due to the reaction force of the steel strip is prevented, and a decrease in the binding force of the steel strip is avoided. can.

(2) By forming ribs on the parallel portions of the U-shaped pieces, deformation of the parallel portions can be prevented and a reduction in the binding force of the steel strip can be avoided.

(3) By adopting a structure in which the steel strip is guided by ribs formed on the parallel parts of the U-shaped piece, sideways displacement of the steel strip from the U-shaped piece is prevented.

(4) As a result of (1) to (3) above, the piston stroke sensor can be reliably fixed to the cylinder body.

(5) The parallel portion of the U-shaped piece bends the steel strip inward from the tangential direction to the outer peripheral surface of the cylinder body, increasing the length of the steel strip that comes into contact with the circumferential direction of the cylinder body. Therefore, the binding force applied to the cylinder body is dispersed, and deformation of the cylinder body is prevented.

[Brief explanation of the drawing]

Fig. 1 is an external view showing the mounted state of a piston stroke sensor mounting device which is an embodiment of the present invention, Fig. 2 is a view seen from the direction indicated by the arrow - in Fig. 1, and Fig. 3 is a view of the present invention. A perspective view showing a series of parts constituting a piston stroke sensor fixture according to an embodiment, FIG. 4 is a bottom plan view of a U-shaped piece with a cap attached, and FIG. FIG. 1... Cylinder body, 10... Connection piece, 11...
...Threaded hole, 20... Steel strip, 30... U-shaped piece, 3
1, 32...parallel part, 311, 312, 321,
322...rib, 40...cap, 50...bolt, 60...plate.

Claims (1)

[Claims for Utility Model Registration] (1) A piston stroke sensor fixture for fixing a piston stroke sensor installed at any position on the outer periphery of a cylinder body to the cylinder body, which has both ends attached to a connecting piece having a threaded hole. is formed into an annular shape by being fixed, and a steel band surrounding the cylinder body and the piston stroke sensor, the connecting piece and a part of the steel band fixed to the connecting piece are removably inserted, and the a U-shaped piece having a through hole that aligns with the screw hole of the connecting piece; a cap that is attached to the U-shaped piece and has a through hole that aligns with the through hole of the U-shaped piece;
A piston stroke characterized by comprising a tightening means that is screwed into a threaded hole of the connecting piece through the through hole of the U-shaped piece and the cap, and whose tip end abuts against a piston stroke sensor via a contact plate. Sensor mounting bracket. (2) A piston stroke according to claim 1 of the utility model registration claim, characterized in that the parallel portion of the U-shaped piece is provided with a rib extending from the tip of the parallel portion to at least the inside of the portion covered by the cap. Sensor mounting bracket.