JPH07722Y2 - Stroke adjustment cylinder forward end sensing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a device for sensing the forward end of a cylinder whose stroke can be adjusted.

[Conventional technology]

As shown in FIG. 2, a piston 3 provided with a piston rod 2 is fitted in the cylinder tube 1, the piston rod 2 is projected to the outside of the cylinder tube 1, and the expansion chamber 4 and the contraction chamber 4 are contracted in the cylinder tube 1. A cylinder is known in which a chamber 5 is formed, and a fluid pressure is supplied to the extension chamber 4 and the contraction chamber 5 to move the piston rod 2 forward and backward.

In such a cylinder, the magnet 6 is attached to the piston 3, the reed switch 7 is attached to the cylinder tube 1, and the reed switch 7 is turned on by the magnet 6 to detect the forward end and the backward end of the piston rod 2. I am trying.

On the other hand, in order to adjust the stroke to the forward end, the stroke adjusting nut 8 is attached to the protruding end side of the piston rod 2, and the stroke adjusting nut 8 is used for the cylinder tube 1.
The forward end is regulated by coming into contact with the stopper 9 attached to, and the stroke to the forward end is adjusted by moving the stroke adjusting nut 8.

[Problems to be solved by the invention]

However, if the stroke up to the forward end is changed as described above, the position of the piston 3 shifts, so it is necessary to shift the position of the reed switch accordingly, and the operation is troublesome.

Therefore, an object of the present invention is to provide a forward end detecting device for a stroke adjusting cylinder, which can detect the forward end without shifting the position of the reed switch even if the stroke to the forward end is changed.

[Means and Actions for Solving Problems]

Attach the head 12 to the cylinder 11 to form the cylinder tube 10,
A piston rod 16 connected to a piston 13 fitted in the cylinder tube 10 is projected outward from a head 12 of the cylinder tube 10, and a cylindrical body 21 is attached to the head 12 from an outer surface 12b of the head 12. The piston 13 is mounted so as to project outwardly, and the forward end of the piston 13 is regulated by abutting the outer surface 12b of the head 12 with a size to be inserted into the cylindrical body 21 at the protruding end of the piston rod 16. Stroke adjusting nut 17 is screwed in, magnet 25 is attached to the stroke adjusting nut 17, and the reed switch is attached to the outer surface of the cylindrical body 21.
Stroke adjustment cylinder forward end detection device with 22 attached.

As a result, the magnet 25 attached to the stroke adjusting nut 17 and the reed switch 22 attached to the tubular body 21 can detect the forward end, and the stroke adjusting nut 17 is moved with respect to the piston rod 16 to reach the forward end. Even if is changed, the relative position of magnet 25 and stroke adjustment nut 17 does not change, and stroke adjustment nut 17
Reed switch 22 that comes into contact with the outer surface 12b of the
Can be operated to detect the forward end, and the forward end can be detected without changing the mounting position of the reed switch 22.

Further, since the cylindrical body 21 projects outward from the head 12 and the stroke adjusting nut 17 enters the cylindrical body 21, the cylindrical body 21
Reed switch 22 attached to 21 is a stroke adjustment nut
Since the magnet 25 attached to the 17 and the tubular body 21 correspond to each other and operate reliably, the reed switch 22 and the magnet
The forward end can be reliably detected by 25, and the reed switch 22 and the magnet 25 do not come into contact with each other, so that the durability is improved.

〔Example〕

As shown in FIG. 1, the cylinder tube 10 has a head 12 attached to a stainless steel cylinder 11 that prevents magnetic leakage, and a piston 13 is fitted in the cylinder tube 10 to reduce the expansion chamber 14 and the expansion chamber 14. The piston rod 16 that forms the chamber 15 and is connected to this piston 13 projects outward from the hole 12a of the head 12, and the stroke adjusting nut 17 is screwed into the threaded portion 16a on the projecting end side and locks. It is fixed with nuts 18.

A magnet 19 is attached to the piston 13 and the cylinder 11
A reed switch 20 is attached to the head 12, and when the piston 13 comes into contact with the head 12 to reach the reverse end, the reed switch 20 is turned on by the magnet 19 so that the reverse end can be sensed. The inner peripheral portion of one end of the stainless steel tubular body 21 is screwed to be connected to the tubular body 21.
The reed switch 22 is attached to the stroke adjusting nut 17, and the stroke adjusting nut 17 is inserted into the tubular body 21 so that the contact plate 23 contacts the outer surface 12b of the head 12. A magnet 25 is attached to the annular groove 24. 26 is a magnet protection material.

Therefore, when the fluid pressure is supplied to the extension chamber 14 and the piston rod 16 is moved forward together with the piston 13, the contact plate 23 of the stroke adjusting nut 17 causes the contact plate 23 of the head 12 to move to the outer surface 12 of the head 12.
The reed switch 22 is turned on by the magnet 25 while being in contact with b to become the forward end, whereby the forward end can be sensed.

Also, even if the stroke adjusting nut 17 is moved to adjust the stroke to the forward end, the contact plate 23 of the stroke adjusting nut 17 is always attached to the outer surface of the head 12 at the forward end.
Since it abuts on 12b, the magnet 25
The forward end can be detected with.

[Effect of device]

The magnet 25 attached to the stroke adjusting nut 17 and the reed switch 22 attached to the tubular body 21 can detect the forward end, and the stroke adjusting nut 17 is moved with respect to the piston rod 16 to change the stroke to the forward end. Even if the magnet 25 and the stroke adjusting nut 17 do not change their relative positions, the stroke adjusting nut 17 does not move to the outer surface 12b of the head 12.
The reed switch 22 that comes into contact with and becomes the forward end operates to detect the forward end, and the forward end can be detected without changing the mounting position of the reed switch 22.

Further, since the tubular body 21 projects outward from the head 12 and the stroke adjusting nut 17 enters into the tubular body 21, the reed switch 22 attached to the tubular body 21 uses the magnet 25 attached to the stroke adjusting nut 17. Since the reed switch 22 and the magnet 25 can reliably detect the forward end, the reed switch 22 and the magnet 25 can reliably detect the forward end, and the durability is improved because the reed switch 22 and the magnet 25 do not contact each other.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 10 is a cylinder tube, 13 is a piston, 16 is a piston rod, 17 is a stroke adjusting nut, 22 is a reed switch, and 25 is a magnet.

Claims (1)

[Scope of utility model registration request] A head 12 is attached to a cylindrical body 11 to form a cylinder tube 10, and a piston rod 16 connected to a piston 13 fitted in the cylinder tube 10 is projected outward from the head 12 of the cylinder tube 10. The cylindrical body 21 is attached to the head 12 so as to project outward from the outer surface 12b of the head 12, and is inserted into the cylindrical body 21 at the projecting end portion of the piston rod 16. Outer surface 12 of head 12
A stroke adjusting nut 17 that restricts the forward end of the piston 13 by abutting on b is screwed, a magnet 25 is attached to the stroke adjusting nut 17, and a reed switch 22 is attached to the tubular body 21. Stroke adjustment cylinder forward end sensing device.