JPH021523Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a fluid pressure cylinder equipped with a position detector that operates in response to a permanent magnet provided on the piston and thereby detects the stroke position of the piston. In particular, the present invention relates to a structure for mounting a position detector to a cylinder.

(Prior art and its problems) Conventionally, when attaching a position detector to a fluid pressure cylinder, a mounting band is attached to the outer peripheral surface of the cylinder body and the detector is attached via this band, or the detector is attached to the cylinder body. The detector is attached via a tie rod for attaching the cylinder cover that is equipped to the cylinder cover, or a mounting bar that is attached to the cylinder body with screws, etc. for attaching the detector, but in either case, the position detector, band, and tie rod are attached Or, it is necessary to interpose some intermediate mounting member such as a bracket between the mounting bar and the mounting bar.
Since screws and the like are required to attach the intermediate attachment member itself, the number of parts increases, making the attachment work extremely troublesome, and the appearance is also unsightly.

(Technical means for solving the problem) The present invention was made with the aim of solving the above-mentioned conventional problems. A mounting groove with a substantially T-shaped cross section consisting of a narrow groove part and a wide inner groove part is provided in the axial direction of the cylinder body, and a detection means that operates in response to a permanent magnet provided on the piston is built-in. A body formed to be able to fit into the mounting groove, a mounting piece integrally connected to the body and formed to be able to fit into at least the wide groove portion of the mounting groove, and a mounting piece screwed into the mounting piece. The body of the position detector is engaged with the mounting groove, and the mounting piece is fitted into the wide groove of the mounting groove, and the mounting piece is secured by the fixing screw. It is formed by being press-fitted and fixed to the inner surface of the wide groove.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 4.

In these figures, A indicates a small single-rod type pneumatic cylinder, and B indicates a position detector attached to this cylinder A.

The pneumatic cylinder A has a cylinder body 1 made of aluminum alloy, into which a head cover 2 is integrally formed.
It consists of a piston rod 4 with an aluminum alloy piston 3 at its tip and inserted into the cylinder hole 1a of the cylinder body 1, and a rod cover 5 attached to the open end of the cylinder hole 1a. A ring-shaped permanent magnet 3a is installed on the side surface.
is installed.

The cylinder body 1 has a short rectangular prism shape, and a T-shaped mounting groove 6 consisting of an outer narrow groove portion 6a and an inner wide groove portion 6b is formed on one outer side of the cylinder body 1. As is clear from FIGS. 1 and 2, the wide groove portion 6b of the mounting groove 6 has a cross section that is similar to the cylinder hole 1.
It is formed in an arc shape concentrically with a. The cylinder body 1 also has intake and exhaust ports 7 and 8 that communicate with the rod side chamber and the head side chamber, respectively.
is drilled. The cylinder body 1 is integrally formed by extruding an aluminum alloy, for example.

As is clear from FIG. 4, each position detector B is
can be engaged in the mounting groove 6 of the cylinder body 1,
A substantially rectangular parallelepiped body 9 is provided with a cavity 9a along its longitudinal direction, and is fitted and fixed into the cavity 9a of the body 9, and is responsive to a permanent magnet 3a attached to the piston 3. A reed switch 10 as an operating detection means is integrally connected to one end of the body 9, and its cross section is formed in a shape corresponding to the cross-sectional shape of the T-shaped mounting groove 6 of the cylinder body 1. It consists of a piece 11 and a fixing screw 13 such as a screw that is screwed into a screw hole 12 extending through the thickness of the attachment piece at one end of the attachment piece 11. Above mounting piece 1
Reference numeral 1 has the same thickness as the depth of the mounting groove 6, and includes a narrow piece portion 11a that can fit into the narrow groove portion 6a of the mounting groove 6, and a wide groove portion 6 of the mounting groove 6.
Similarly to the mounting piece 11, the body 9 has a thickness that is the same as the depth of the mounting groove 6, but its width is larger than that of the narrow groove part 6a in the mounting groove 6. (This is so that the bodies 9, 9 of the two detectors B and B fit into the mounting groove 6 in parallel, as shown in Figure 1.) ). Also,
As shown in FIG. 4, one of the protrusions 11b ₀ and 11b ₀ on both sides of the wide piece 11b constituting the mounting piece ₁₁ extends along the side edge of the body 9. . In addition, the above body 9 and mounting piece 1
1 is integrally molded from a suitable synthetic resin.

When installing the above position detector B, the first
As shown in the figure, the two position detectors B, B are fitted into the mounting groove 6 in opposite directions, and both mounting pieces 11, 11 fitted into the mounting groove 6 are inserted into the mounting groove 6. While sliding the bodies 9 in opposite directions along the body, both bodies 9, 9 are positioned sideways next to each other. From this state, each mounting piece 11
Screw the fixing screw 13 into the screw hole 12 until the tip of the screw 13 comes into contact with the bottom surface of the mounting groove 6. When _this screw 13 is further tightened, as _shown in FIG. , and thereby each position detector B is fixed at a fixed position in the mounting groove 6.

Each reed switch 10 has a lead wire 10a.
are connected to each other, so that the required connections can be made. Moreover, the permanent magnet 3a
is attached to a support ring 15 that is fixed to the piston rod 4 via an individual ring 14 while in contact with the side surface of the rod side of the piston 3, and the reed switch 10 is moved by the magnetic force of this permanent magnet 3a. It's starting to work. Therefore, by attaching the position detector B at a required position on the cylinder body 1, the stroke position of the piston 3 can be detected.

In the figure, 16 indicates a split ring for fixing the rod cover in cylinder A, and 17 indicates a cushion ring.

According to the embodiment described above, the outer surface of each position detector B is flush with the outer surface of the cylinder body 1, and the entire position detector B is completely embedded in the mounting groove 6. The appearance will be much better. Further, due to the structure of the position detector B, there is an advantage that two position detectors B, B can be mounted in one mounting groove 6 by effectively utilizing the space thereof.

In the above embodiment, one attachment groove 6 is provided on the outer surface of the cylinder body 1, but a plurality of attachment grooves 6 may be provided as necessary. Furthermore, although the cylinder body 1 is shaped like a square prism in this embodiment,
A cylinder body having a polygonal column shape such as a cylinder or a hexagonal column may be used.

Furthermore, since the cylinder of this example has a relatively small diameter and stroke of the cylinder hole, the head cover is formed integrally with the cylinder body and the intake and exhaust ports are provided in the cylinder body. In the case of a relatively large cylinder, the cylinder body may be made independent and a head cover and a rod cover may be separately attached to both ends of the cylinder body, and in this case, the intake and exhaust ports may be provided on the head cover and the rod cover.

Furthermore, in this embodiment, the cross-sectional shape of the mounting piece 6 is made to correspond to the cross-sectional shape (substantially T-shaped) of the mounting groove 6 of the cylinder body 1, so that the entire mounting piece 6 is fitted into the mounting groove 6. However, the mounting piece 6 may be composed only of the aforementioned wide piece portion 11b, and only this wide piece portion 11b may be fitted into the wide groove portion 6b of the mounting piece 6. Further, the body 9 does not necessarily have to be completely embedded in the mounting groove 6 as in this embodiment, but may be made to protrude somewhat from the outer surface of the cylinder body 1.

(Effects of the invention) According to the invention, there is no need for a special band or mounting bar for mounting the position detector, making it easier to mount the detector.Moreover, the mounting groove is recessed in the outer surface of the cylinder body. Therefore, the material of the cylinder body can be used effectively, and the bulk and protrusion of the position detector attached to the outer surface of the cylinder body can be minimized, making it possible to improve the appearance. . Furthermore, according to the present invention, since the mounting piece is integrally formed on the position detector itself, there is no need for any intermediate mounting members such as brackets as in the conventional case, and all that is required for mounting is tightening the fixing screw. , the number of parts is smaller than that of the conventional one, and the work of installing the position detector can be done very easily and quickly.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of a fluid pressure cylinder with a position detector showing an embodiment of the present invention, Fig. 2 is a partially sectional side view of the same cylinder, and Fig. 3 is a partially sectional front view of the same cylinder. , FIG. 4 is a partially cross-sectional perspective view of the position detector in the same cylinder. A...Fluid pressure cylinder, B...Position detector, 1
...Cylinder body, 3a...Permanent magnet, 6...Mounting groove, 6a...Narrow groove part, 6b...Wide groove part, 9
...Body, 10...Reed switch (detection means), 11...Mounting piece, 12...Screw hole, 13...
...Fixing screw.

Claims (1)

[Scope of utility model registration request] A mounting groove with a roughly T-shaped cross section consisting of an outer narrow groove part and an inner wide groove part is provided in a required part of the outer surface of the cylinder body in the axial direction of the cylinder body. a body that incorporates a detection means that operates as a sensor and is formed so as to be able to fit into the mounting groove, and a mounting that is integrally connected to the body and formed so that it can fit into at least the wide groove portion of the mounting groove. and a fixing screw screwed into the mounting piece, and the body of the position detector is engaged with the mounting groove, and the mounting piece is fitted into the wide groove of the mounting groove. A fluid pressure cylinder with a position detector, in which the mounting piece is press-fitted and fixed to the inner surface of the wide groove by the fixing screw.