JP5190656B2 - 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

  A technical problem of the present invention is that a position detection switch attached to a switch mounting groove that opens on an 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 having a circular cross section formed in the longitudinal direction on the outer surface of a body in a fluid pressure device and the switch groove for opening the switch groove to the outer surface are provided. A position detection switch mounting mechanism for fixing a position detection switch inserted through the opening into a switch mounting groove having a narrower opening than the diameter, and the position detection switch can be inserted into the switch mounting groove through the opening. A structure having a width, a fixing wall that fits into the opening at the time of mounting in the switch mounting groove, and an accommodation space for the following fixing nut in the switch groove below the fixing wall at the end in the longitudinal direction. The fixing nut inserted into the switch mounting groove is a cylindrical body having a diameter that can rotate inscribed in the switch groove. An outer shape that is cut out to a thickness smaller than the opening and a screw hole that penetrates between the two planes and that can be accommodated in the accommodation space of the fixing nut under the fixing wall of the position detection switch in the switch groove. A mounting screw that has a shape and is screwed into a screw hole of a fixing nut accommodated in the accommodating space through a fixing wall of the position detection switch, and fixes the fixing wall of the position detection switch to an opening edge of the switch mounting groove. A position detection switch mounting mechanism in a fluid pressure device is provided.

  In a preferred embodiment of the position detection switch mounting mechanism in the fluid pressure device according to the present invention, the position detection switch includes a fixed wall outer surface and a switch mounting groove that are flush with the outer surfaces on both sides of the opening of the switch mounting groove. A partial cylindrical surface that is in contact with the groove bottom of the groove, and the mounting screw has a head portion that contacts the fixed wall of the position detection switch and the outer surfaces on both sides of the opening of the switch mounting groove. The position detection switch has a flange portion placed on the outer surface on both sides of the opening of the switch mounting groove, and the mounting screw has a head portion that abuts on a fixed wall having the flange portion of the position detection switch. Can be. Further, the fixing nut may have a projecting wall that can be fitted into a space between both side surfaces of the position detection switch and the side wall surface of the switch groove in the housing space of the position detection switch.

  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 mounted in the switch mounting groove opened in the outer surface of the body in the fluid pressure device can be inserted through the opening. Moreover, the position detection switch can be mounted in a stable state without rotating in the switch mounting groove.

It is explanatory drawing which shows the insertion state of the fixing nut to the switch attachment groove | channel in 1st Example of the position detection switch attachment mechanism which concerns on this invention. It is a principal part perspective view which shows the structure of the position detection switch of the said 1st Example. It is a cross-sectional view which shows the aspect which rotates the fixing nut of the said 1st Example around a centerline, and screws an attachment screw in the state which fitted the position detection switch in the switch attachment groove | channel. It is a cross-sectional view which shows the state which fixed the position detection switch in the said 1st Example to the switch mounting groove. FIG. 5 is a side sectional view of FIG. 4. FIG. 6 is a bottom view of the fixing nut and the position detection switch in FIG. 5. It is a perspective explanatory view showing a state where the position detection switch of the first embodiment is attached to a fluid pressure cylinder. It is a cross-sectional view showing a state where the position detection switch in the second embodiment of the position detection switch mounting mechanism according to the present invention is fixed to the switch mounting groove. It is a sectional side view of FIG.

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. As clearly shown in FIG. 1 and the like, the 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. .

  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 shown in 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. As shown in FIGS. 2 to 4, the position detection switch 10 inserted into the switch mounting groove 5 has a lower cylindrical surface 12 in contact with the bottom of the switch groove 6 of the switch mounting groove 5 and both upper side surfaces. 11 contacts the opening 7 of the switch mounting groove 5, 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. 2 and 5, the position detection switch 10 has a fixed wall 14 fitted into the opening 7 at one end in the longitudinal direction from the upper part thereof when installed in the switch mounting groove 5. It extends in the direction along the opening 7 and is configured to form a receiving space 17 for the following fixing nut 20 in the switch groove 6 below the fixing wall 14. An insertion hole 15 for inserting a mounting screw 25 is provided at the center of the fixed wall 14.
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.

  In order to fix the position detection switch 10 in the switch mounting groove 5, in this position detection switch mounting mechanism, the position detection switch 10 inserted into the switch mounting groove 5 through the opening 7 is accommodated below the fixed wall 14. A fixing nut 20 is disposed in the space 17. As can be seen from FIGS. 1, 2, 7, etc., the fixing nut 20 is a cylindrical body having a diameter that can rotate inscribed in the switch groove 6. The outer shape of the two planes 21 and 21 cut to a thickness smaller than the opening 7 of the switch mounting groove 5, the screw hole 22 penetrating between the two planes 21 and 21, and the inside of the switch groove 6 In FIG. 5, the outer shape is provided that can be accommodated in the accommodating space 17 of the fixing nut 20 below the fixing wall 14 of the position detection switch 10. The two planes 21 and 21 of the fixing nut 20 may be equidistant or unequal from the center of the cylindrical body.

  Further, as can be seen from FIGS. 5 and 6 and the like, the fixing nut 20 is provided between the side surface 13 of the position detection switch 10 and the side wall surface of the switch groove 6 in the accommodating space 17 of the position detection switch 10. A pair of projecting walls 23, 23 that can be fitted into the space are provided, thereby stabilizing the posture when the fixing nut 20 is accommodated in the accommodating space 17, and being attached to the insertion hole 15 at the center of the fixing wall 14. The screw hole 22 of the screw 25 is formed so as to be easily matched.

  When mounting the position detection switch 10 to the switch mounting groove 5, as shown in FIG. 1, two planes 21, 21 are formed by cutting the cylindrical body of the fixing nut 20 to a thickness smaller than the opening 7 of the switch mounting groove 5. The fixing nut 20 passes through the opening 7 of the switch mounting groove 5 so as to face the opening 7 of the switch mounting groove 5 and then passes through the rotation process in the posture shown by the chain line in FIG. The screw hole 22 is placed in a posture such that the axis of the screw hole 22 faces in the vertical direction, and is then pushed into the housing space 17 of the position detection switch 10 fitted in the switch mounting groove 5 as shown in FIGS. As a result, the pair of protruding walls 23 and 23 of the fixing nut 20 are inserted into a space between the both side surfaces 13 of the position detection switch 10 and the wall surface of the switch groove 6, and are fixed. The screw hole 22 in the nut 20 by aligning the through holes 15 of the fixing wall 14, it is possible to hold the position detecting switch 10 and the fixing nut 20 to the desired position in the switch mounting groove 5.

  Alternatively, as described above, the position of the position detection switch 10 and the fixing nut 20 can be accommodated in the accommodation space 17 after the fixing nut 20 assumes the posture shown by the solid line in FIG. The switch mounting groove 5 may be fitted into the switch mounting groove 5, whereby the position detection switch 10 and the fixing nut 20 can be held in the intended posture in the switch mounting groove 5.

In this state, the fixing screw 14 is screwed into the fixing nut 20 through the insertion hole 15 in the fixing wall 14 of the position detection switch 10, so that the fixing wall 14 of the position detection switch 10 is opened in the switch mounting groove 5. 7 mouth rims.
In particular, in the position detection switch 10 inserted in the switch mounting groove 5, the lower partial cylindrical surface 12 is in contact with the bottom of the switch groove 6 of the switch mounting groove 5, and the upper both side surfaces 11 are openings of the switch mounting groove 5. 7, the position of the position detection switch 10 in the switch mounting groove 5 can be stably maintained.

  In the position detection switch 10 according to the first embodiment, the outer surface of the fixed wall 14 is open on both sides of the switch mounting groove 5 in a state where the lower partial cylindrical surface 12 is in contact with the bottom of the switch groove 6 in the switch mounting groove 5. The mounting screw 25 is formed so as to be flush with the outer surface of the position 7 and is screwed into the screw hole 22 of the fixing nut 20 accommodated in the accommodating space 17 through the fixing wall 14 of the position detecting switch 10. The position detection switch 10 is fixed by screwing the mounting screw 25 to the fixing nut 20 and having a head portion 25a that contacts the fixing wall 14 of the switch 10 and the outer surfaces on both sides of the opening 7 of the switch mounting groove 5. The wall 14 is fixed to the lip of the opening 7 of the switch mounting groove 5. In this case, in order to stably fix the position detection switch 10, a washer or the like is interposed between the fixed wall 14 and the fixed nut 20 as necessary, or a corresponding one is separately provided. Can do.

  On the other hand, the second embodiment shown in FIGS. 8 and 9 is applied to the switch mounting groove 5 in the body 2 or the like of the fluid pressure cylinder 1 as in the case of the first embodiment. The flange portion 35 placed on the outer surface on both sides of the opening 7 of the switch mounting groove 5 is provided on the entire upper portion of the switch 30, or at least on the fixed wall 34, and the mounting screw 25 is connected to the flange of the position detection switch 30. The head portion 25a is in contact with the fixed wall 34 provided with the portion 35. With this configuration, it is not necessary to use a washer or the like as in the first embodiment. Since other configurations and operations in the second embodiment are not different from those in the first embodiment, the same reference numerals are given to the same or corresponding parts as in the first embodiment, and the description thereof is omitted. .

  When the position detection switch 30 of the second embodiment is fixed to the switch mounting groove 5, the same operation as that of the first embodiment may be performed, but the head portion 25a of the mounting screw 25 is moved to the position detection switch 30. Therefore, the position detection switch 10 is interposed between the head portion 25a of the mounting screw 25 and the body 2 of the fluid pressure cylinder 1 because it is screwed into the fixing nut 20 in contact with the fixing wall 34 having the flange portion 35. The flange portion 35 of the fixed wall 14 is sandwiched, and the lip of the opening 7 of the switch mounting groove 5 is sandwiched between the flange portion 35 and the fixing nut 20 to fix them.

2 Body 5 Switch mounting groove 6 Switch groove 7 Opening 10, 30 Position detection switch 12 Partial cylindrical surface 14, 34 Fixed wall 17 Housing space 20 Fixed nut 21 Flat surface 22 Screw hole 23 Projecting wall 25 Mounting screw 25a Head part
35 Flange

Claims (4)

A switch mounting groove formed in a longitudinal direction on the outer surface of a body in a fluid pressure device and having a circular cross section of the cross section and an opening narrower than the diameter of the switch groove that opens the outer surface to the outer surface. A position detection switch mounting mechanism for fixing the position detection switch inserted through the opening,
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 into the opening at the end of the longitudinal direction when the switch is mounted in the switch mounting groove. The switch groove is configured to have the following fixing nut housing space,
An outer shape in which the fixing nut inserted into the switch mounting groove is cut out to a thickness smaller than the opening of the switch mounting groove in a parallel two planes with a diameter that can rotate inscribed in the switch groove. A screw hole penetrating between the two planes, and having an outer shape that can be accommodated in the accommodating space of the fixing nut below the fixing wall of the position detection switch in the switch groove,
A fixing screw that is screwed into a screw hole of a fixing nut housed in the housing space through a fixing wall of the position detection switch, and that fixes the fixing wall of the position detection switch to an opening edge of the switch mounting groove;
A position detection switch mounting mechanism in a fluid pressure device. The position detection switch has a fixed wall outer surface that is flush with the outer surfaces on both sides of the opening of the switch mounting groove, and a partial cylindrical surface that is in contact with the groove bottom of the switch mounting groove,
The mounting screw has a head portion that abuts against the outer surface on both sides of the fixed wall of the position detection switch and the opening of the switch mounting groove;
The position detection switch mounting mechanism in the fluid pressure device according to claim 1. The position detection switch has a flange portion placed on the outer surface on both sides of the opening of the switch mounting groove,
The mounting screw has a head portion that abuts on a fixed wall provided with the flange portion of the position detection switch;
The position detection switch mounting mechanism in the fluid pressure device according to claim 1.   The said fixing nut is provided with the protrusion wall which can be inserted in the space between the both sides | surfaces of a position detection switch, and a switch groove side wall surface in the accommodation space of a position detection switch. A position detection switch mounting mechanism in the fluid pressure device according to any one of the above.

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