JP5190657B2 - Position detection switch mounting mechanism in fluid pressure equipment - Google Patents

Description

  The present invention relates to a position detection switch mounting mechanism in a fluid pressure device.

  In Patent Document 1, as a position detection switch mounting mechanism for detecting the position of a moving body such as a piston in a fluid pressure device such as a fluid pressure cylinder, a longitudinal switch is mounted on the outer surface of the body in those fluid pressure devices. A position detection switch with a magnetic sensor that detects the approach of the permanent magnet attached to the piston can be moved along the switch mounting groove and fixed at any position. It is disclosed that the position detection switch can be fitted through the opening into the switch mounting groove that opens on the outer surface of the body of the fluid pressure device.

  That is, in the position detection switch mounting mechanism, the position detection switch has an elliptical cross-sectional shape, the dimension on the short diameter side is smaller than the constricted opening width of the switch mounting groove, and the dimension on the long diameter side is the opening of the switch mounting groove. By making the width larger than the width, the switch mounting groove is inserted through the short diameter side thereof and then rotated by 90 ° in the groove, and the fixing screw screwed into the short diameter side is inserted into the groove in the groove. A screw head larger than the opening width of the switch mounting groove is pressed against the inner shoulder of the opening edge by unscrewing the fixing screw, thereby fixing the position detection switch to the switch mounting groove.

  However, when a configuration in which the position detection switch rotates in the switch mounting groove, such as the position detection switch mounting mechanism disclosed in Patent Document 1, the position of the position detection switch fixed to the switch mounting groove is stabilized. In addition, the sensitivity of the position detection switch may be reduced, and if the curved surface of the screw head of the fixing screw is pressed against the inner shoulder of the opening edge of the switch mounting groove, However, there is a problem that the mounting posture of the position detection switch cannot be stabilized, the fixing to the switch mounting groove itself becomes unstable, and cannot be firmly fixed at a predetermined position.

US Pat. No. 6,868,771

  The technical problem of the present invention is that a position detection switch attached to a switch mounting groove that opens on the outer surface of a body in a fluid pressure device can be inserted through the opening, and the position detection switch rotates in the switch mounting groove. Accordingly, it is an object of the present invention to provide a position detection switch mounting mechanism that can be mounted with its mounting posture stabilized.

  In order to solve the above problems, according to the present invention, a switch groove formed in the longitudinal direction on the outer surface of a body in a fluid pressure device for fitting a position detection switch and the opening is opened on the outer surface. A position detection switch mounting mechanism for fixing a position detection switch inserted through the opening to a switch mounting groove having an opening narrower than the switch groove to be moved, wherein the position detection switch is inserted into the switch mounting groove. It has a width that can be inserted through the opening, and has a fixed wall that fits into the opening at the end in the longitudinal direction when mounted in the switch mounting groove, and the following elastic body bush and clamp in the switch groove below the fixed wall The elastic body bushing and the clamp nut are configured to be inserted through the opening in the switch groove. The elastic body bush is formed of an elastic body, and is disposed between the fixed wall and the clamp nut in the switch groove. The fixing wall and the clamp nut are screwed into the clamp nut from above the fixed wall. The fluid pressure device has a bulging deformation portion that bulges and deforms in the direction of the inner wall of the switch groove and is pressed against and locked to the inner wall of the switch groove. A position detection switch mounting mechanism is provided.

  In a preferred embodiment of the position detection switch mounting mechanism according to the present invention, the elastic body bush is made of a polymer organic material having rubber elasticity, and the swelling is provided on both sides of the insertion hole of the mounting screw provided in the center. In this case, the clamp nut abuts on both ends in the longitudinal direction of the switch mounting groove in the elastic bushing, and the elastic bushing is deformed in the same direction. It is desirable to have a convex wall to suppress.

  In another preferred embodiment of the position detection switch mounting mechanism according to the present invention, the elastic body bushing is constituted by a frame-shaped body of a belt-shaped elastic metal plate that is elastically deformed, and the frame-shaped body is configured as the position detection switch. A bulging deformed portion that bulges toward the inner wall of the switch groove by tightening between the wall surfaces by a mounting screw is provided between the wall pressed by the switch fixing wall and the wall of the clamp nut. Configured.

  In another preferred embodiment of the position detection switch mounting mechanism, the elastic body bushing remains in a position in which it is stored in a storage space below the fixed wall when the position detection switch is fixed. It is formed so that it can be inserted without being elastically deformed through the opening or by being compressed and deformed in the width direction by its elasticity.

  According to the position detection switch mounting mechanism in the fluid pressure device of the present invention described in detail above, the position detection switch attached to the switch mounting groove opened on the outer surface of the body in the fluid pressure device can be inserted through the opening, In addition, the position detection switch can be mounted in a stable state without rotating in the switch mounting groove.

It is a front view of the separation state of the mounting screw, the position detection switch, the elastic body bush, and the clamp nut in the first embodiment of the position detection switch mounting mechanism according to the present invention. It is a perspective view of the elastic body bush in the said 1st Example. It is a front view which shows the preparation state which inserts and fixes the said position detection switch in a switch attachment groove | channel by a cross section. It is a sectional side view of the edge part of the position detection switch in the state of FIG. It is a front view which shows the state which inserted and fixed the said position detection switch in the switch installation groove | channel by a cross section. It is a sectional side view of the edge part of the position detection switch in the state of FIG. It is a perspective explanatory view showing a state where the position detection switch is attached to a fluid pressure cylinder. It is a front view of the separation state of the attachment screw in the 2nd example of the position detection switch attachment mechanism concerning the present invention, a position detection switch, an elastic body bush, and a clamp nut. It is a perspective view of the elastic body bush in the said 2nd Example. It is a front view which shows the preparation state which inserts and fixes the said position detection switch in a switch attachment groove | channel by a cross section. It is a front view which shows the state which inserted and fixed the said position detection switch in the switch installation groove | channel by a cross section. It is a sectional side view of the edge part of the position detection switch in the state of FIG. It is a perspective explanatory view showing a state where the position detection switch is attached to a fluid pressure cylinder.

1 to 7 show a first embodiment of a position detection switch mounting mechanism according to the present invention. In this first embodiment, a fluid pressure cylinder 1 for driving a piston rod 3 as an example of a fluid pressure device is shown. However, the present invention is not limited thereto. For example, a valve having a valve member that slides in the valve body may be used.
The fluid pressure cylinder 1 to which the position detection switch mounting mechanism according to the present invention is applied includes a conventionally known switch mounting groove 5 formed on the outer surface of the body 2 in the longitudinal direction. This switch mounting groove 5 has a switch groove 6 having a circular cross section and an opening 7 narrower than the diameter of the switch groove 6 for opening the switch groove 6 on the outer surface, as clearly shown in FIGS. However, the switch groove 6 does not necessarily have a circular cross section.

  The position detection switch 10 fixed to the switch mounting groove 5 can be inscribed in the opening 7 so as to be fitted through the opening 7 of the switch mounting groove 5, as can be seen from FIGS. Therefore, as shown in FIG. 7, both ends of the switch mounting groove 5 provided in the body 2 of the fluid pressure cylinder 1 are connected to the head cover 2A and the rod cover 2B attached to both ends of the body 2, respectively. May be closed. Further, as shown in FIG. 5, the position detection switch 10 inserted in the switch mounting groove 5 has the lower partial cylindrical surface 12 in contact with the bottom of the switch groove 6 and the upper side surfaces 11 are openings of the switch mounting groove 5. 7, and the position detection switch 10 can be slid with respect to the switch mounting groove 5 at these contact portions.

Further, as shown in FIGS. 4, 6 and 7, the position detection switch 10 has a fixed wall 14 that fits into the opening 7 when installed in the switch mounting groove 5 from one upper end in the longitudinal direction. It extends in the direction along the opening 7, and is configured to form a storage space 17 for an elastic bush 20 and a clamp nut 30 described below in the switch groove 6 below the fixed wall 14. An insertion hole 15 is provided in the center of the fixed wall 14 for inserting an attachment screw 18 for tightening the elastic body bush 20 and the clamp nut 30.
The detection unit of the position detection switch 10 is configured as a magnetic sensor that detects the approach of a permanent magnet provided on the piston of the fluid pressure cylinder 1 and outputs a signal, and the output is transmitted to the outside through the lead wire 16. Is.

  As described above, the position detecting switch 10 can be fitted into the switch mounting groove 5 from above through the opening 7. However, in order to fix the position detecting switch 10 in the switch mounting groove 5, the elastic bush 20 and the clamp nut 30 are used. Also, the switch groove 6 is formed in a form that can be fitted through the opening 7 from above. However, the elastic body bush 20 is deformed and fitted by its elasticity.

  The elastic body bush 20 is made of a polymer organic material having a bush body 21 having rubber elasticity, and the bush body 21 is arranged in the switch groove 6 below the fixed wall 14 with the fixed wall 14 and the clamp nut. The inner side of the switch groove 6 is fastened with the mounting screw 18 screwed into the clamp nut 30 from above the fixed wall 14 on both sides of the insertion hole 22 of the mounting screw 18 provided in the center. It has a bulging deformation portion 23 that bulges and deforms in the wall direction and presses and locks to the inner wall. When the position detection switch 10 is fixed, the elastic bush 20 remains in the position in which it is accommodated in the accommodation space 17 below the fixed wall 14 of the position detection switch 10 even when it is inserted into the switch mounting groove 5 alone. Thus, it can be inserted through the opening 7 of the switch mounting groove 5 without elastic deformation, or it can be inserted by being compressed and deformed by contacting with the opening 7.

  Further, the clamp nut 30 is for tightening the elastic body bush 20 between the fixed wall 14 of the position detection switch 10 in the accommodation space 17 of the switch groove 6, and is inserted through the center of the elastic body bush 20. There is a screw hole 31 of the mounting screw 18 corresponding to the position of the hole 22, and when the position detection switch 10 is fixed, the switch mounting groove 5 is opened in a posture in which it is accommodated in the accommodating space 17 below the fixing wall 14. The width in this posture is formed smaller than the width of the opening 7 so that it can be inserted through the opening 7 (see FIGS. 3 and 4). However, if the operation of inserting into the switch groove 6 is inconvenient, it is possible to adopt a configuration wider than the opening 7 such that it can be inserted by being inclined. Further, the clamp nut 30 abuts against both ends of the bushing body 21 in the longitudinal direction of the switch mounting groove 5, and has a convex wall 32 that suppresses elastic deformation of the bushing body 21 in the same direction. It is formed by bending at both ends.

  In the above position detection switch mounting mechanism, various procedures can be taken when mounting the position detection switch 10 in the switch mounting groove 5. For example, first, the mounting screw 18 shown in FIG. The elastic bush 20 as shown in FIGS. 3 and 4 is not tightened by the clamp nut 30 by being temporarily screwed into the clamp nut 30 through the insertion hole 15 of the fixed wall 14 and the insertion hole 22 of the elastic bush 20. In this state, the entire position detection switch 10, the elastic body bush 20 and the clamp nut 30 are pushed into the switch mounting groove 5 while elastically deforming the elastic body bush 20, and the mounting screw 18 is clamped. By tightening the nut 30, as shown in FIG. The inner sidewall direction Tchimizo 6 by bulging deformation can be locked pressure engagement with the internal side wall.

  Further, after the position detection switch 10, the elastic body bush 20 and the clamp nut 30 are individually fitted into the switch mounting groove 5, the elastic body bush 20 and the clamp nut 30 are placed below the fixed wall 14 of the position detection switch 10. In this state, the mounting screw 18 is screwed into the clamp nut 30 through the insertion hole 22 of the elastic bush 20 from the insertion hole 15 of the fixed wall 14 in the position detection switch 10. The bulging deformation part 23 of the elastic body bush 20 can be bulged and deformed in the direction of the inner wall of the switch groove 6 and can be press-fitted to the inner wall.

  Even if the position detection switch 10 is attached to the switch mounting groove 5 by any of the above-described procedures, the convex wall 32 is provided on the clamp nut 30 so that the convex wall 32 becomes the switch mounting groove 5 of the elastic bush 20. Since the elastic deformation of the elastic body bushing 20 in the same direction is suppressed, the bulging deformation of the bulging deformation portion 23 toward the inner wall of the switch groove 6 is promoted. .

  8 to 13 show a second embodiment of the position detection switch mounting mechanism according to the present invention. In the second embodiment, as will be described below, the elastic bush 20 is constituted by a frame-shaped body 25 of an elastic metal plate that is elastically deformed, and the clamp nut 35 is the clamp of the first embodiment. The only difference from the first embodiment is that the nut 30 does not have a convex wall 32, and other configurations and operations are the same as those of the first embodiment. For this reason, portions common to the first embodiment in the figure are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted.

  The elastic body bush 20 constituted by the elastic metal plate frame 25 will be specifically described. As shown in FIG. 9, the frame 25 is a wall surface pressed against the fixed wall 14 of the position detection switch 10. 26 and a wall surface 27 on the clamp nut 30 side are continuously provided with a bulging deformation portion 29 that bulges in the direction of the inner wall of the switch groove when the mounting screws 18 are tightened between the wall surfaces 26 and 27. The wall surface 26 and the wall surface 27 are provided with an insertion hole 28 for the mounting screw 18 for tightening the elastic body bush 20 between the fixed wall 14 of the position detection switch 10 and the clamp nut 30.

  In addition, although the said frame-like body 25 is illustrated as what was cyclic | annularly connected by connecting the both ends of both wall surfaces 26 and 27 with the formation wall of the bulging deformation part 29, for example, the bulging deformation part 29 of both sides is shown. The wall surfaces 27 may be connected to the forming walls, and the wall surfaces 27 may be overlapped and brought into contact with the clamp nut 30 to form a non-annular shape. Further, the frame-like body 25 can be configured as an integral body with the clamp nut 30.

DESCRIPTION OF SYMBOLS 5 Switch mounting groove 6 Switch groove 7 Opening 10 Position detection switch 14 Fixed wall 17 Storage space 18 Mounting screw 20 Elastic body bush 25 Frame-shaped body 30 Clamp nut 23, 29 A bulging deformation part

Claims (5)

A switch groove for fitting a position detection switch, which is formed in the longitudinal direction on the outer surface of the body in the fluid pressure device, and an opening narrower than the switch groove for opening the position detection switch on the outer surface. A position detection switch mounting mechanism for fixing a position detection switch inserted through the opening in the switch mounting groove,
The position detection switch has a width that can be fitted into the switch mounting groove through the opening, and has a fixed wall that fits in the opening at the end of the longitudinal direction when mounted in the switch mounting groove, and the fixed wall It is configured to have the following elastic body bush and clamp nut accommodating space in the lower switch groove,
The elastic body bush and the clamp nut have a form that can be inserted through an opening in the switch groove,
The elastic body bush is formed of an elastic body and is disposed between the fixed wall and the clamp nut in the switch groove, and is fixed between the fixed wall and the clamp nut with a mounting screw that is screwed into the clamp nut from above the fixed wall. By being tightened in between, it has a bulging deformation part that bulges and deforms in the direction of the inner wall of the switch groove and presses and locks to the inner wall of the switch groove.
A position detection switch mounting mechanism in a fluid pressure device. The elastic body bush is made of a polymer organic material having rubber elasticity, and includes the bulging deformation portions on both sides of the insertion hole of the mounting screw provided in the center.
The position detection switch mounting mechanism in the fluid pressure device according to claim 1. The clamp nut is in contact with both longitudinal ends of the switch mounting groove in the elastic bush, and has a convex wall that suppresses deformation of the elastic bush in the same direction;
The position detection switch mounting mechanism in the fluid pressure device according to claim 2. The elastic body bush is constituted by a frame-shaped elastic metal plate frame that is elastically deformed, and the frame-shaped body is formed by a wall surface pressed against the fixed wall of the position detection switch and a wall surface on the clamp nut side. In between, a bulging deformation portion that bulges in the direction of the inner wall of the switch groove by tightening between the two wall surfaces by a mounting screw is provided continuously.
The position detection switch mounting mechanism in the fluid pressure device according to claim 1. The elastic bush does not elastically deform through the opening of the switch mounting groove or is compressed in the width direction by the elasticity while maintaining the posture in which the elastic bushing is accommodated in the accommodating space below the fixing wall when the position detection switch is fixed. And is configured to be insertable,
The position detection switch mounting mechanism in the fluid pressure device according to any one of claims 1 to 4.

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