JP5464439B2 - Fluid pressure cylinder with position detection switch - Google Patents

Description

  The present invention relates to a fluid pressure cylinder with a position detection switch provided with a position detection switch for detecting a driving position of a piston, and more particularly to a fluid pressure cylinder suitable for use in a food-related processing machine or the like.

  A magnet is attached to a piston that slides along a cylinder hole in the cylinder body, and a position detection switch that detects the proximity of the piston by a magnetic sensor is attached to the cylinder body, and the position of the piston is detected and output. An apparatus in which the detection signal is used as a control signal for automatic control and the position detection switch is accommodated in the cylinder body is already known from Patent Document 1 shown as an example.

  Thus, when the position detection switch is arranged inside the cylinder body, there are many irregularities such as mounting grooves and rails for the position detection switch, metal fittings and mounting bolts for mounting the position detection switch on the outside of the cylinder body. It is not formed, and the outer surface of the cylinder body can be easily cleaned. However, when used as a fluid pressure cylinder for food and chemical processing machines, cleaning with a high temperature and high pressure cleaning liquid is frequently performed. Therefore, if the irregularities on the outer surface are reduced, it is possible to clean thoroughly every corner with a small number of cleaning steps, and the drainage and wiping properties after cleaning are improved, making it suitable as a fluid pressure cylinder used in food and chemical processing machines. It becomes a thing.

  In the fluid pressure cylinder described above, when the proximity of the magnet provided on the piston is detected by the position detection switch and the position of the piston is output as a detection signal, it is usually detected that the piston has reached the stroke end. In this case, it is possible not only to detect that the piston has completely reached the stroke end, but also to detect that the piston has reached an arbitrarily set position close to the stroke end, and control the signal for automatic control. Therefore, even if the position detection switch is housed near the stroke end of the cylinder body, it is required to be able to adjust the position in the axial direction.

  Further, as the position detection switch accommodated in the cylinder body, it is desirable in view of economy and convenience to use a general-purpose switch that has been accommodated in the switch mounting groove on the outer surface of the cylinder body. When the position detection switch is used, an operation indicator for confirming the operation state is provided on the position detection switch so that the operation indicator can be viewed from outside the cylinder body. In addition, when used as a fluid pressure cylinder for foods, chemical-related processing machines, etc., it is necessary to have a structure that can withstand cleaning with the above-described high-temperature and high-pressure cleaning liquid and liquid-tightness of each part.

German Patent Publication No. 4408039A1

  The technical problem of the present invention is a fluid pressure cylinder suitable for use in the above-described food and chemical processing machines, etc., and a general-purpose position detection switch conventionally attached to a switch mounting groove on the outer surface of the cylinder body, The screw hole used for the mounting can also be used and accommodated in the cylinder body so that the position can be easily adjusted near the stroke end. The operation indicator light of the position detection switch can also be seen from the outside of the cylinder body. In addition, the position of the position detection switch can be adjusted in the switch adjustment window at the switch mounting position, and all or part of the fluid pressure cylinder is installed for the position adjustment. It is an object of the present invention to provide a fluid pressure cylinder that eliminates the need for removal from a machine or the like.

  Another technical problem of the present invention is to secure a structure that can withstand cleaning with high temperature and high pressure cleaning liquid and liquid tightness of each part, and further, the liquid of the lead wire of the position detection switch according to the installation environment of the hydraulic cylinder. It is an object of the present invention to provide a fluid pressure cylinder capable of selecting a derivation direction in a dense state.

In order to solve the above problems, according to the present invention, a magnetic sensor and an operation indicator lamp are built in a rod-shaped switch body, a lead wire for signal transmission is led out from one end of the switch body, and the switch body Is provided with a position detection switch having a mounting screw hole perpendicular to the axis, and the position detection switch detects the proximity of the magnet provided on the piston sliding along the cylinder hole in the cylinder body. the fluid pressure cylinder for outputting a signal through the lead wires as a detection signal of the position of the piston, the cylinder body, two and a switch insertion hole which is disposed in parallel to the cylinder bore, the switch insert two said of a switch adjustment window which opens the switch insertion hole to the outer surface of the cylinder body in communication with the hole, removable or movable to the switch adjustment windows A window cover made of a light-transmitting material that is closely attached and makes the operation indicator lamp of the position detection switch visible; and a sealing member that seals the two switch insertion holes liquid-tightly to the outside The two switch adjustment windows are formed at different positions in the axial direction of the cylinder holes in the two switch insertion holes so as to correspond to one stroke end and the other stroke end of the piston. cage, the position detecting switch is inserted movably together with the lead wire connected to the axial direction of the switch insertion hole in it, the lead wires are led out to the liquid-tight to the outside through the sealing member, the switch In the adjustment window, the mounting position of the position detection switch in the switch insertion hole in the adjustment window can be adjusted in the central axis direction of the switch insertion hole. Position detecting switch with a fluid pressure cylinder, characterized in are provided.

  In a preferred embodiment of the fluid pressure cylinder according to the present invention, the position detection switch has a central axis line in the switch insertion hole by an operation through the switch adjustment window in which the window cover is opened in the window cover. In this case, the window cover is integrally formed of a synthetic resin on a fixed frame fixed to the inner periphery of the switch adjustment window via a flexible hinge. It is desirable to fix the fixed frame to the switch adjustment window in a liquid-tight manner and to allow the window cover to be liquid-tightly attached to the fixed frame.

  Further, in another preferred embodiment of the fluid pressure cylinder according to the present invention, the window cover of the switch adjustment window is in the direction of the central axis of the switch insertion hole while maintaining liquid tightness with respect to the switch adjustment window. The position detection switch is arranged on the inner surface side of the window cover in the switch insertion hole and is screwed into the screw hole of the position detection switch from the outside of the window cover. Thus, the mouth of the switch adjustment window is sandwiched between the peripheral portion of the window cover and the shoulder of the position detection switch, and the window cover and the position detection switch are fixed to the mouth.

  Furthermore, in the fluid pressure cylinder according to the present invention, the deflection of the lead wire when adjusting the position of the position detection switch in the direction of the central axis of the switch insertion hole is accommodated in the two switch insertion holes. A bending allowance is provided, and this bend allowance can be configured such that the bending portion of the lead wire can be accommodated but a rod-like switch body cannot be fitted.

  Further, in the fluid pressure cylinder according to the present invention, the two switch insertion holes are opened to the outside by opening at one end in the central axis direction of the cylinder body, and the cylinder body is located at a position close to the opening end. A branch opening in a direction perpendicular to the central axis of the cylinder opens to the outer surface of the cylinder body, and the lead wire of the position detection switch can be selectively led out from either the opening or the branch opening. can do. In this case, the lead wire of the position detection switch is led out from either one of the opening at the central axial direction end of the cylinder body and the branch opening branched therefrom, and the opening and the branch opening are opened. As a sealing member for liquid-tight sealing, at the mouth of the opening or branch opening from which the lead wire is led out, a gasket that seals the periphery of the lead wire is externally fitted, and the gasket is opened. Sealing members that are held by press-fitting to the opening of the hole or branch opening with a pressing plate, while the branch opening or opening that does not lead out the lead wire are liquid-tightly sealed. It is desirable to use a branching hole or a plug for sealing that fits into the opening.

  According to the above-described present invention, in a fluid pressure cylinder suitable for use in food processing, chemical-related processing machines, etc., a general-purpose position detection switch that is conventionally attached to a switch mounting groove on the outer surface of the cylinder body is used for the attachment. The position detection switch operation indicator light can also be visually recognized from the outside of the cylinder body.

In addition, since the position of the position detection switch can be adjusted in the switch adjustment window at the switch mounting position, all or a part of the fluid pressure cylinder is installed for the position adjustment. There is no need to remove it.
In addition, a structure that can withstand cleaning with high-temperature and high-pressure cleaning liquid and the liquid-tightness of each part are ensured, and the lead-out direction of the position detection switch lead in the liquid-tight state is also selected according to the installation environment of the hydraulic cylinder can do.

It is a top view which shows the external appearance of 1st Example of the fluid pressure cylinder which concerns on this invention. It is an expanded sectional view in the AA position of FIG. FIG. 2 is an enlarged right side view of FIG. 1. It is an expanded sectional view of the position detection switch mounting position of FIG. It is a principal part expanded longitudinal cross-sectional view in the position detection switch attachment position of the said Example. It is sectional drawing which shows the half-open state of the window cover in the said Example. It is sectional drawing which shows the fully open state of the said window cover. It is a principal part expansion longitudinal cross-sectional view in the position detection switch attachment position of 2nd Example of the fluid pressure cylinder which concerns on this invention. It is a partial top view of the position detection switch attachment position in the said 2nd Example. It is the principal part cross-sectional view.

1 to 7 show a first embodiment of a fluid pressure cylinder according to the present invention.
In the fluid pressure cylinder according to the present invention, the position detection switch 10 is basically housed in the switch insertion hole 2 provided in the cylinder body 1 instead of mounting the position detection switch in the switch mounting groove outside the cylinder body. In this case, it is desirable in terms of economy and convenience to use a general-purpose position detection switch that has been conventionally mounted in the switch mounting groove on the outer surface of the cylinder body. When using the screw, the operation indicator light for confirming the operating state provided on the position detection switch is visible from the outside of the cylinder body, and the screw hole used for mounting the general-purpose position detection switch It is effective for reducing the cost of making it available.

  The fluid pressure cylinder of the present invention satisfies such a requirement, and therefore, the position detection switch itself has been widely used conventionally, and the configuration thereof can be seen from FIGS. 2, 4 and 5. In addition, a magnetic sensor and an operation indicator lamp 14 are built in the rod-shaped switch body 11, a lead wire 12 for signal transmission is led out from one end of the switch body 11, and the switch body 11 is attached to the switch body 11 perpendicular to its axis. The screw hole 13 is opened. The position detection switch 10 detects the proximity of the magnet 8 provided on the piston 7 that slides along the cylinder hole 3 in the cylinder body 1, and uses the signal as a detection signal for the position of the piston 7. Is output through.

  On the other hand, as shown in FIG. 2, the cylinder body 1 has two switch insertion holes 2 and 2 arranged in parallel with the cylinder hole 3, and the switches as shown in FIGS. A switch adjustment window 4 for opening the insertion hole 2 in the shape of a long hole along the outer surface of the cylinder body 1 within the switch mounting position adjustment range at the stroke end opposite to the piston 7, and the attachment / detachment to the switch adjustment window 4 A window cover 5 made of a transparent or translucent light-transmitting material that can be attached in a liquid-tight manner and allows the operation indicator lamp 14 of the position detection switch 10 to be visible, and the two switch insertion holes 2 are externally provided. And a sealing member, which will be described later, for liquid-tight sealing. In addition, although the figure has shown the Example which provided two switch insertion holes 2 and 2 in parallel in one surface in the cylinder body 1, if necessary, the same switch insertion hole can also be provided in another surface. .

The position detection switch 10 is inserted into the switch insertion hole 2 movably in the axial direction together with the lead wire 12 connected to one end of the switch body 11, and the lead wire 12 is inserted into the sealing member. It is led out liquid-tightly through.
A rod cover 1a and a head cover 1b for closing both ends of the cylinder hole 3 are provided at both ends of the cylinder body 1, and the piston 7 and the rod cover 1a connected to the piston 7 are connected in the cylinder hole 3. The piston rod 9 slidably passes therethrough, but the basic configuration of the fluid pressure cylinder is not limited to this configuration.

  In the switch adjustment window 4, the mounting position of the position detection switch 10 to the switch insertion hole 2 in the adjustment window 4 is formed so as to be adjustable in the central axis direction of the switch insertion hole 2. Specifically, as shown in FIGS. 1 and 5, the position detection switch 10 includes a screw 15 in a screw hole 13 for mounting the switch body 11 inserted at a predetermined position in the switch insertion hole 2. Is fixed by pushing the tip of the screw 15 against the inner bottom of the switch insertion hole 2 and pressing the shoulder 11a of the switch body 11 against the inside of the opening of the switch adjustment window 4 in the switch insertion hole 2. Therefore, by opening the window cover 5 of the switch adjustment window 4 and operating the screw 15, the position detection switch 10 can be inserted into the switch insertion hole within a range in which the screw 15 can be operated through the switch adjustment window 4. The position can be arbitrarily adjusted in the axial direction of the two. In other words, the switch adjustment window 4 may be provided within a range where the position of the position detection switch 10 is desired to be adjusted.

  As shown in FIGS. 4 to 7, the window cover 5 is integrally formed of a synthetic resin on a fixed frame 18 fixed to the inner periphery of the switch adjustment window 4 with a flexible hinge portion 19. The locking projection 5b of the leg 5a provided on the cover 5 can be locked to the mouth protrusion 18a of the fixed frame 18 so that the window cover 5 can be liquid-tightly attached to the fixed frame 18. It is a thing. The fixing to the switch adjustment window 4 can be performed by, for example, fixing the fixing frame 18 to the inner periphery of the switch adjustment window 4 in a liquid-tight manner by bonding or the like. When the window cover 5 is attached to the fixed frame 18, the space between them is sealed by a seal member (not shown).

  The two switch insertion holes 2 may be opened to the outside only by an opening 2a at one end in the central axis direction of the cylinder body 1. In the illustrated embodiment, as shown in FIG. In addition to the opening to the outside at the end, at a position close to the opening end, a branch opening 2b in a direction perpendicular to the central axis of the cylinder body 1 is opened to the outer surface on the upper side of the cylinder body 1, The lead wire 12 of the position detection switch 10 is formed so as to be selectively led out from either one of the opening 2a and the branch opening 2b. This is because depending on the installation position of the cylinder body 1, there is an obstacle at the opening end of the switch insertion hole 2, and the lead wire 12 cannot be led out.

  Thus, even when there is a branch opening 2b in addition to the opening 2a of the switch insertion hole 2 at the end in the central axis direction of the cylinder body 1, these openings need to be liquid-tightly closed. When the lead wire 12 of the position detection switch 10 is led out from one of the opening 2a and the branch opening 2b branched from the opening 2a, the opening 2a and the branch opening 2b are liquid-tightly sealed. As shown in FIGS. 1, 3 and 5, a gasket 21 that seals the periphery of the lead wire 12 is externally fitted to the opening portion of the opening 2 a from which the lead wire 12 is led out. The gasket 21 is held by press-fitting to the mouth of the opening 2a with a pressing plate 22 and fixed with a screw 22a, while the branch opening 2b that does not lead out the lead wire 12 is liquid-tight. As a sealing member to seal It uses a plug 24 for sealing made of elastic material to press fit into their branched apertures 2b. When the lead wire 12 is led out from the branch opening 2b, it is natural that the opening using the gasket 21, the holding plate 22, and the sealing plug 24 is reversed.

  When the opening through which the lead wire 12 is led out by the gasket 21 and the holding plate 22 is closed, the lead wire 12 is fixed at the opening portion, so that the switch in the two switch insertion holes 2 thereafter The movement for adjusting the position of the main body 11 in the axial direction may be difficult. In order to facilitate the adjustment of the position of the switch body 11 in such a case, as can be seen from FIG. 2, the switch is inserted so as to give the lead wire 12 the bending necessary for adjusting the position of the position detection switch 10. A bending allowance 2c in which the bending of the lead wire 12 is accommodated in the side of the hole 2 is provided in a bulged state. Therefore, if there is a possibility of adjusting the switch body 11 in the central axis direction, the bending amount of the lead wire may be stored in the bending allowance 2c. However, when the switch body 11 having a large bending allowance 2c and having a rod shape is inserted, the mounting operation of the switch body 11 may be hindered. desirable.

  8 to 10 show a second embodiment in which the mounting structure of the position detection switch 10 in the present invention is different. In the second embodiment, the same position detection switch 10 as in the first embodiment is used, and the screw head 16a protrudes on the window cover in order to be fixed by the screw 16 having a small screw head 16a. It is characterized in that the position detection switch 10 can be adjusted in position together with the window cover only by loosening the screw to which it is attached without being removed.

  The specific configuration of the second embodiment will be described in detail. The cylinder body 1 is provided with a switch insertion hole 2 and a switch adjustment window 4 similar to those of the first embodiment, but a window cover 6 attached thereto. The switch adjustment window 4 is formed so as to be movable by sliding in the central axis direction of the switch insertion hole 2 with respect to the cylinder body 1 over the range of position adjustment of the switch body 11 while covering the switch adjustment window 4 in a liquid-tight manner. A guide plate 6 a for guiding the slide over the above range is provided on the inner side surface of the cover 6 so as to be guided along the inner side surface in the longitudinal direction of the switch adjustment window 4. Although not shown, the window cover 6 is provided with a seal member that seals the periphery of the switch adjustment window 4 of the cylinder body 1 regardless of the movement position of the window cover 6.

  The position detection switch 10 is fixed by disposing the position detection switch 10 on the inner surface side of the window cover 6 in the switch insertion hole 2 and through the screw insertion hole 6b provided in the window cover 6 to the outside of the window cover 6. The screw 16 with a screw head is screwed into the screw hole 13 of the position detection switch 10 and tightened. In this case, the peripheral portion of the window cover 6 and the shoulder portion 11a of the switch body 11 of the position detection switch 10 are used. The window cover 6 and the position detection switch 10 are fixed to the opening 4a. Of course, the periphery of the screw insertion hole 6b provided in the window cover 6 is also sealed.

In order to adjust the mounting position of the position detection switch 10 in the fluid pressure cylinder of the second embodiment having the above-described configuration, a screw head 16 a with a screw head 16 a screwed into the screw hole 13 of the position detection switch 10 from the outside of the window cover 6 is provided. After loosening the screw 16, the position detection switch may be moved to an appropriate position together with the window cover 6, and the screw 16 may be tightened again at that position.
In addition, although illustration is abbreviate | omitted other than the above structure of this 2nd Example, since the said structure and effect | action are substantially the same as the case of 1st Example, it is 1st implementation in the main same component. The same reference numerals as those in the example are attached and the description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Cylinder body 2 Switch insertion hole 2a Opening hole 2b Branch opening 2c Bending allowance 3 Cylinder hole 4 Switch adjustment window 4a Mouth part 5,6 Window cover 7 Piston 8 Magnet 10 Position detection switch 11 Switch main body 11a Shoulder part 12 Lead wire 13 Screw hole 14 Operation indicator lamp 15, 16 Screw 18 Fixed frame 19 Flexible hinge 21 Gasket 22 Holding plate 24 Plug

Claims (7)

A magnetic sensor and operation indicator lamp are built in the rod-shaped switch body, a lead wire for signal transmission is led out from one end of the switch body, and a screw hole for mounting perpendicular to the axis is opened in the switch body. The position detection switch detects the proximity of the magnet provided on the piston that slides along the cylinder hole in the cylinder body, and uses the signal as a detection signal for the position of the piston. In the fluid pressure cylinder that outputs through
The cylinder body includes two switch insertion holes arranged in parallel to the cylinder hole, and a switch adjustment window that communicates with the two switch insertion holes and opens the switch insertion hole on the outer surface of the cylinder body. A window cover made of a translucent material that can be attached to, detached from, or moved to the switch adjustment window and is liquid-tightly attached, and that allows the operation indicator lamp of the position detection switch to be visually confirmed, and the two switch insertion holes And the two switch adjustment windows are formed in the two switch insertion holes in correspondence with one stroke end and the other stroke end of the piston. It is formed at different positions in the axial direction of the cylinder hole,
The position detection switch is inserted into the switch insertion hole movably in the axial direction together with the lead wire connected thereto, and the lead wire is led out liquid-tightly through the sealing member,
In the switch adjustment window, the attachment position of the position detection switch to the switch insertion hole in the adjustment window can be adjusted in the central axis direction of the switch insertion hole.
A fluid pressure cylinder with a position detection switch. The position detection switch is screwed in the window cover so that the position of the position detection switch can be adjusted in the central axis direction in the switch insertion hole by an operation through the switch adjustment window with the window cover opened.
The fluid pressure cylinder with a position detection switch according to claim 1. The window cover is integrally formed of synthetic resin on a fixed frame fixed to the inner periphery of the switch adjustment window via a flexible hinge, and the fixed frame is liquid-tightly fixed to the switch adjustment window and the window. The cover can be liquid-tightly attached to the fixed frame.
The fluid pressure cylinder with a position detection switch according to claim 2. The window cover of the switch adjustment window is formed so that the position can be adjusted by sliding the switch insertion hole in the central axis direction while maintaining liquid tightness with respect to the switch adjustment window, and the position detection switch is inserted into the switch adjustment window. In the hole, the screw is placed on the inner surface side of the window cover and is screwed into the screw hole of the position detection switch from the outside of the window cover. To sandwich the mouth of the switch adjustment window, and fix the window cover and the position detection switch to the mouth.
The fluid pressure cylinder with a position detection switch according to claim 1. The two switch insertion holes are provided with a bending allowance that accommodates the bending amount of the lead wire when adjusting the position of the position detection switch in the direction of the central axis of the switch insertion hole. It is assumed that the switch body that forms a rod shape cannot fit, but the deflection of
The fluid pressure cylinder with a position detection switch according to any one of claims 1 to 4. The two switch insertion holes are opened to the outside by opening at one end in the central axis direction of the cylinder body, and the branch opening in a direction perpendicular to the central axis of the cylinder body at a position close to the opening end The position detection switch lead wire can be selectively led to the outside from either one of the opening or branch opening by opening the cylinder body on the outer surface by
The fluid pressure cylinder with a position detection switch according to any one of claims 1 to 5. The lead wire of the position detection switch is led out from one of the opening in the central axial direction of the cylinder body and the branch opening branched from them, and the opening and branch opening are sealed in a liquid-tight manner. As a sealing member, the opening of the opening or branch opening from which the lead wire is led out is fitted with a gasket that seals the periphery of the lead wire, and the gasket is attached to the opening or branch opening. On the other hand, as a sealing member for liquid-tightly sealing the branch opening or opening that does not lead out the lead wire, the branch opening or opening is held. A plug for sealing that fits into the hole is used.
The fluid pressure cylinder with a position detection switch according to claim 6.

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