JPS6024969Y2 - Fluid pressure cylinder switch mounting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operating position detection switch mounting device for a fluid pressure cylinder.

In a fluid pressure cylinder, such as an air cylinder, if the position of the piston needs to be electrically detected, a permanent magnet is attached to the piston, a reed switch is attached to the cylinder tube, and the operating position of the piston is detected by the reed switch. It has been proposed to use methods such as

As a method of attaching the reed switch to the cylinder tube, a method has been proposed in which the reed switch is tightened and fixed to the cylinder tube from a pan point, but depending on the tightening force, the cylinder tube may become distorted and the movement of the piston may be inhibited. I will do it.

Therefore, the tightening torque must be limited to a certain amount, making the band tightening operation that much more complicated.

If the tightening force is weakened in an attempt to avoid distortion, the switch will move due to vibration, causing an error in the detection position.

In order to overcome the drawbacks of the above band-based switch mounting method, a switch mounting method using tie rods has been proposed.

Conventional mounting devices using tie rods have a structure in which they are attached to a completed cylinder, with the switch being sandwiched from both sides by two inner support metal fittings, and the cylinder being mounted so that the inner support metal fittings span between the two tie rods. The two brackets are attached to the inner support bracket and both ends of the inner support bracket are brought into contact with the tie rod, and the two brackets are tightened together with bolts to hold the tie rod in a pressed state against the inner support bracket.

In such a conventional device, the inner support fitting is installed between two tie rods of the cylinder as a finished product, so the attachment end of the inner support fitting cannot be made larger than the inner distance between the two tie rods.

This means that even if the contact surface of the inner support fitting with the tie rod is formed into an arc shape along the circumferential surface of the tie rod, it cannot be made into an arc surface of a quarter arc or more.

Moreover, since the width of the inner support metal fitting cannot be increased too much, the contact surface between the inner support metal fitting and the tie rod is small and limited.

Although the conventional mounting device described above has improved the problem of distortion in the cylinder, it has the disadvantage that it is easily caused to shift due to vibration because it is fixed by friction with a small contact surface, and the number of parts increases, making it expensive to install. This had the disadvantage that operations were complicated.

Also, since two inner support metal fittings are used to hold the switch from both sides, if there is an error in their length, the shorter inner support metal fitting will not be able to fully contact the tie rod even if tightened with a bracket. This weakens the holding power of the switch and causes it to shift with the slightest vibration.

SUMMARY OF THE INVENTION The object of the present invention is to overcome the above-mentioned drawbacks and to provide a mounting device which is simple in structure and low cost, and which securely holds the switch.

The present invention has two mounting fittings of the same shape and a fastening bolt for fastening the mounting fittings together, and the mounting fitting has a groove-shaped covering portion covering one tie rod at one end, and the other end at the center. a support plate having a presser portion bent in the same direction as the cover portion, and a switch mounted between the support plate in a plane substantially perpendicular to the support plate at substantially both ends of the support plate; two legs extending at a pinchable interval, the free ends of the legs having at least a semi-circular recess in contact with the tie rod opposite to the tie rod with which the groove-shaped cover of the mounting bracket engages; one leg is provided with a positioning part bent toward the other leg, and two mounting brackets are arranged facing each other so that the leg extends toward the switch with the switch in between. The above object is achieved by a switch mounting device for a fluid pressure cylinder, which is characterized in that a grooved cover is placed on one tie rod, a concave portion of the leg is engaged with the other tie rod, and both fittings are fastened with a fastening bolt. did.

The details of the invention will be explained with reference to embodiments shown in the figures.

1 to 3, a switch 4, for example a reed switch, is fixedly held by a mounting device 5 to a fluid pressure cylinder 3, such as an air cylinder, in which a head cover and a rod cover (not shown) are fixed to a cylinder tube 1 by tie rods 2.

The mounting device 5 includes two mounting fittings 6, namely mounting fittings 6a.
and mounting bracket 6b, two fastening bolts 7 and nuts 8
It becomes more.

The mounting brackets 6a and 6b are formed in the same shape, and the two mounting brackets 6 having the same shape are used in a state where they are placed facing each other.

As shown in FIG. 4, the mounting bracket 6 includes a support plate 10 having a groove-shaped covering portion 9 that covers approximately half the circumference of the tie rod 2 from the outside, and two legs 11 integrally formed on the support plate 10.
and has.

The two legs 11 extend substantially perpendicularly to the support plate 10 and are arranged at a predetermined interval.

Each of the two legs 11 has a substantially semi-circular engagement recess 12 formed on the surface facing the tie rod 2 when attached to the cylinder 3.

The engagement recess 12 can also be formed in an arcuate shape that contacts the tie rod 2 over a semicircle or more, if necessary.

On one leg 11, for example leg 11a, there is a side surface of the switch 4.
A positioning portion 13 that contacts the switch and positions the switch.
will be provided.

In the illustrated example, the positioning portion 13 is formed by bending the upper end of the leg 11a into a substantially L-shape toward the side facing the switch, but the positioning portion 13 is not limited to this example.

It is not necessary to provide the positioning portion 13 on the other leg 11b.

As shown in FIG. 1, when the positioning parts 13 of the two mounting brackets 6a and 6b are in contact with both sides of the switch 4 and the mounting brackets 6a and 6b are fixed with the switch sandwiched between them, the switch 4 will be displaced. It is retained without any problems.

A portion of the upper end of the support plate 10 is bent toward the switch 4 and is formed as a presser portion 15 so as to press a portion of the switch 4 from above during installation.

The holding portion 15 may be fixed to the support plate 1o later if necessary.

The support plate 10 has bolt holes 14 for the fastening bolts 7.

When installing the switch, the switch 4 is arranged so that the elastic material such as a rubber plate or the like or the elastic material attached to the switch itself contacts the cylinder tube 1.

Next, the mounting brackets 6a and 6b are installed in a diagonal direction with respect to a plane passing through the two tie rods so that the recesses 12 are in contact with the tie rods 2.

The positions are adjusted so that the positioning portions 13 of the two mounting fittings 6a and 6b are in contact with the side surfaces of the switch 4, respectively.

In the attached state, the cover portion 9 covers the outer surface of the tie rod 2.

Preferably, it contacts the tie rod 2. Further, the holding portion 13 is configured to press the switch 4 from above.

When the fastening bolt 7 is inserted into the two fittings 6a, 6b and fastened with the nut 8, the two fittings 6a, 6b approach each other, and the recessed portion 12 of each is pressed against the tie bolt 2.

By tightening the fastening bolt 7, the pressing force of the concave portion 12 against the tie rod 2 is increased to increase the frictional force, and further the pressing force of the cover portion 9 against the tie rod 2 is increased to increase the frictional force.

With this invention, the switch can be mounted using two mounting brackets, which reduces the number of parts and costs.Furthermore, the mounting brackets are formed with high precision by press molding, and the contact surface with the tie rod is increased. Furthermore, an excellent effect of increasing the holding force by increasing the pressing force was obtained.

According to the present invention, a cover part is formed outside the arc-shaped recess, and since the cover part can be slightly deformed due to the elasticity of the plate material, the cover part contacts the tie rod just a little before or at the same time as the recess contacts the tie rod. If the dimensions are selected so that when the mounting bracket is tightened with the fastening bolt 7, the cover part will elastically escape while maintaining contact with the tie rod until the concave part fully contacts the tie rod, and the leg It does not hinder progress.

Therefore, a very strong frictional holding force can hold the switch in place.

If you want to change the position of the switch, you can easily move it by loosening the bolt.

Since the switch is held between the positioning parts of the two mounting fittings and pressed from above by the holding part, it can be held securely without fear of falling off.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a mounting state using the mounting device according to the present invention, FIG. 2 is a front view, FIG. 3 is a side view, and FIG. 4 is a perspective view of the mounting bracket. 1... Cylinder tube, 2... Tie rod, 3... Fluid pressure cylinder, 4...
・Switch, 5...Mounting device, 6a, 6b...
...Mounting bracket, 7...Tightening bolt, 9...
...Cover part, 10...Support plate, 11°11
a, llb... Leg, 12... Concavity, 1
3...Positioning part, 15...Pressing part.

Claims (1)

[Scope of utility model registration request] A switch mounting device for a fluid pressure cylinder in which a head cover and a rod cover are fastened together using a tie rod, which has two mounting fittings 6 of the same shape and a fastening bolt 7 that fastens the mounting fittings 6 to each other, A support plate 10 having a groove-shaped covering part 9 on one end of which the metal fitting 6 covers one tie rod 2, and the other end having a presser part 15 bent approximately in the center so as to form a recess in the same direction as the covering part 9. and two legs 11a extending at substantially both ends of the support plate in a plane substantially perpendicular to the support plate at a distance that allows the switch to be sandwiched between them when installed;
11b, and the free ends of the legs 11a and 11b have at least a semi-circular recess 12 in contact with the tie rod 2 that faces the tie rod 2 that is engaged with the groove-shaped covering portion 9 of the mounting bracket 6. However, one leg 11a is provided with a positioning part bent toward the other leg 11b, and two mounting brackets are arranged facing each other so that the leg extends toward the switch with the switch in between. A switch mounting device for a fluid pressure cylinder, characterized in that a groove-shaped cover is arranged on one tie rod, a recessed part of a leg is engaged with the other tie rod, and both fittings are fastened with a fastening bolt.