JPH088401Y2 - Fluid pressure equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fluid pressure actuating device, and particularly to a cylinder device having a magnetic sensor for detecting a predetermined actuating position of an actuating member such as a piston. And effective technology.

[Prior Art] In a cylinder device or the like, a magnet to be detected is provided on the piston, and a magnetic sensor is provided on the outer peripheral side of the cylinder tube so that a predetermined operating position of the piston is detected by the magnetic sensor. It is a thing.

In such a cylinder device, it is difficult to recognize the position of the piston when the piston is located at a position other than the predetermined position to be sensed by the magnetic sensor.

Therefore, for example, when setting the mounting position of the magnetic sensor to the cylinder tube, the maximum sensitivity position of the magnetic sensor (when the magnet for detection provided on an operating member such as a piston moves in one direction and passes, It is difficult and uncertain to match the center position between the N and S magnetic poles of the magnet to be detected with the approximate middle of the operating range from when the switch is turned on to when it is turned off. The workability of setting is poor.

Therefore, a sliding groove is formed on the outer peripheral side of the cylinder tube along the moving direction of the piston, and the plate-shaped indicator in this sliding groove is magnetically coupled with the magnet for detection of the piston via the cylinder tube. There is a type in which the moving position of the piston can be recognized over a wide range by visually checking the sliding position of the indicator by sliding the sliding groove along with the movement of the indicator.

[Problems to be Solved by the Invention] In a cylinder device or the like provided with the above-mentioned indicator, since the facing surfaces of the indicator and the sliding surface of the sliding groove are formed as flat surfaces, The indicators are brought into full contact with each other and the indicator slides on the sliding surface.

Therefore, due to the large contact area between the facing surfaces, the sliding resistance is large and the smooth operation of the indicator is hindered.

An object of the present invention is to provide a fluid pressure actuated device capable of smoothing the operation of the indicator.

The above and other objects and novel features of the present invention are as follows.
It will be apparent from the description of this specification and the accompanying drawings.

[Means for Solving the Problems] The structure of the fluid pressure actuated device according to the present invention is shielded from the outside by a shield wall of the main body, and has an actuating member having a detected part, and the shield member via the shield wall. A fluid that is magnetically coupled to the detection unit and includes an indicator that detects the position of the operating member by sliding along with the movement of the operating member, and a sliding surface on which the indicator slides. The pressure-operated device has a structure in which the opposing surfaces of the indicator and the sliding surface are in partial contact with each other so that the indicator slides on the sliding surface.

In this case, it is possible to adopt a structure in which a groove that extends along the sliding direction of the indicator and that reduces the contact area between the facing surfaces is formed on one of the facing surfaces.

Further, the cross-sectional shape of at least one of the facing surfaces, which crosses the sliding direction of the indicator, may be a convex curved surface.

Further, the indicator may have a plate-like structure.

[Operation] According to the above-mentioned means, the opposing surface sides of the indicator and the sliding surface are partially contacted with each other and the indicator is slid on the sliding surface, so that the opposing surface side Sliding resistance is reduced compared to a structure in which they are all in contact with each other, so that the operation of the indicator can be facilitated, and through this smoothing, the accuracy of the position detection of the operating member by the indicator can be improved. be able to.

Such an effect is obtained by, for example, a structure in which a groove extending along the sliding direction of the indicator and reducing the contact area between the facing surfaces is formed on one of the facing surfaces, or the groove of the indicator. It is possible to easily and surely obtain by adopting a structure in which at least one of the opposing surface sides that cross the sliding direction has a convex curved surface shape.

[Example] Figs. 1 (a), (b), (c), (d), (e),
FIG. 2 (f) is an enlarged cross-sectional view showing an indicator and a sliding groove of the fluid pressure actuating device according to an embodiment of the present invention.
Figure is a plan view of the fluid pressure actuated device, and Figure 3 is II of Figure 2.
Partial sectional view taken along the line I-III, and FIG. 4 shows IV- in FIG.
5 is a sectional view taken along line IV, FIG. 5 (a) is a sectional view showing a modification of the fluid pressure actuated device according to the embodiment of the present invention, and FIG. 5 (b) is a sectional view taken along line VV.

The fluid pressure actuated device of this embodiment is a double-acting cylinder device, and as shown in FIG. 4, a cylinder body 1 and a piston 2 (which is shielded from the outside by a shield wall 1a of the cylinder body 1). Working member), a magnet 3 for detection (detection portion) fitted to the outer peripheral portion of the piston 2, and a pair of magnetic sensors 4 attached to the cylinder body 1.
And a pair of plate-shaped indicators 5 which are slid along with the movement of the piston 2 due to the magnetic attraction of the magnet 3.

The cylinder chamber of the cylinder body 1 is partitioned by a piston 2 into a left cylinder chamber 6a and a right cylinder chamber 6b.

A piston rod 2a projects from one end surface of the piston 2.

The left cylinder chamber 6a communicates with the supply / discharge port 7a, and the right cylinder chamber 6b communicates with the supply / discharge port 7b.

A mounting groove 8 for a sensor extends along the axial direction on the outer peripheral portion of the cylinder body 1.

As shown in FIG. 2, in the magnetic sensor 4, an arm 9 extends from the one side surface of the magnetic sensor 4 at a predetermined distance from the one side surface, and the magnetic sensor 4 extends between the one side surface and the inner side surface of the arm 9. A columnar cam 10 as an opening means is rotatably interposed.

The cam 10 has a driver groove 10a formed in its head, and can be rotated using the driver groove 10a.

As shown in FIGS. 2 and 3, the cam 10 has a small diameter portion.
10b is formed so as to be eccentric from the upper and lower large diameter portions 10c.

On one side surface of the magnetic sensor 4 and on the inner side surface of the arm 9, upper and lower portions are fitted with fitting grooves 4a, in which large diameter portions 10c of the cam 10 are fitted,
9a are formed respectively.

The cam 10 has a large-diameter portion 10c because a part of the outer peripheral portion of the large-diameter portion 10c is slidably fitted in the fitting grooves 4a and 9a, respectively.
Is rotated about the axis of the rotation axis, and the small diameter part
10 is eccentrically rotated with respect to the large diameter portion 10c.

Then, the small-diameter portion 10b is eccentrically rotated to cause the magnetic sensor 4 to move.
When the arm 9 is separated from one side surface and is displaced toward the arm 9 side, the arm 9 spreads outward against the elastic force thereof, and the other side surface of the magnetic sensor 4 and the outer side surface of the arm 9 are in both sides of the mounting groove 8. The magnetic sensor 4 is easily and surely fixed to the mounting groove 8 by being pressed against the side surfaces.

Further, as shown in FIG. 3, the sloped portion 4b on one end side of the bottom of the magnetic sensor 4 is pressed against the sloped portion 8a on one end side of the bottom of the mounting groove 8 and pushed down, so that the magnetic sensor 4 is mounted on the mounting groove 8. It has a structure that is securely fixed.

Sliding grooves for indicators are provided on both ends of the lower part of the mounting groove 8.
8b are respectively extended along the axial direction.

The indicators 5 are slidably arranged along the axial direction in the sliding grooves 8b, and the indicators are magnetically coupled with the magnets 3 through the shield walls 1a to be accompanied by the movement of the piston 2 and slide grooves.
It is designed to be slid on 8b.

Further, the slidable indicators 5 are respectively visible from the outside of the cylinder body 1 through the opening side of the mounting groove 8.

Next, in this embodiment, the indicator 5 and the sliding groove are
The indicator 5 is slid on the sliding surface of the sliding groove 8b by partially contacting the surfaces of the sliding surfaces facing the sliding surface which is the bottom surface of 8b.

An example of such a structure is shown in FIGS. 1 (a), (b) and (c), for example, when the surface of the indicator 5 facing the sliding surface of the sliding groove 8b is a flat surface. A plurality of or a single groove 20 is extended on the sliding surface of the sliding groove 8b along the sliding direction of the indicator 5, or as shown in FIG. A structure is formed in which the cross-sectional shape of the sliding surface of the sliding groove 8b that traverses is formed in a convex curved surface shape to reduce the contact area between the opposing surfaces of the indicator 5 and the sliding surface of the sliding groove 8b. Conceivable.

On the other hand, when the sliding surface of the sliding groove 8b is a flat surface, as shown in FIG. 1 (e), a plurality of or a plurality of pieces are provided on the facing surface side of the indicator 5 facing the sliding surface of the sliding groove 8b. A structure in which a single groove 21 is extended along the sliding direction of the indicator 5 to reduce the contact area between the opposed surfaces of the indicator 5 and the sliding surface of the sliding groove 8b can be considered.

In addition, as shown in FIG. 1 (f), the cross-sectional shape of the opposing surfaces of the indicator 5 and the sliding surface of the sliding groove 8b, that is, both of them that cross the sliding direction of the indicator 5 A conceivable structure is one in which the cross-sectional shape between the facing surfaces is formed into a convex curved surface shape to reduce the contact area between the facing surfaces of the indicator 5 and the sliding surface of the sliding groove 8b.

Further, by appropriately combining the above-described aspects, it is possible to form a structure in which the opposing surfaces of the indicator 5 and the sliding surface of the sliding groove 8b are in partial contact.

Further, the sliding surface on the opposite surface side can be further smoothly operated by applying surface treatment for reducing frictional resistance or coating with resin or the like, if necessary.

Next, as shown in FIG. 2, the magnetic sensor 4 is displayed with a first display section 11 for displaying the highest sensitivity position.

On the other hand, the indicator 5 is provided with a second display unit 12 for displaying the moving direction, that is, the center position between both ends in the axial direction.
And a third display unit 13 for displaying the operating range of the magnetic sensor 4, respectively.

Then, when the indicator 5 is held by the magnet 3 by its magnetic attraction force, the second display portion 12 of the indicator 5
3a at the center position of the magnet 3 and the center position between the north and south poles 3
Since the second display portion 12 of the indicator 5 is made visible and the second display portion 12 of the indicator 5 is respectively visible from the outside of the cylinder body 1 through the opening side of the mounting groove 8, the second display portion 12
The center position 3a of the magnet 3 can be easily recognized by visually recognizing.

Further, by recognizing the center position 3a of the magnet 3, when the mounting position of the magnetic sensor 4 on the cylinder body 1 is set, the first display portion 11, that is, the highest sensitivity position of the magnetic sensor 4 and the center position 3a of the magnet 3 are detected. Can be set easily and surely.

Lead wires 4c are extended from the magnetic sensor 4, respectively.

 Next, the operation of this embodiment will be described.

First, in the state shown in FIG. 4, when fluid pressure such as compressed air is supplied from the supply / discharge port 7b to the right cylinder chamber 6b, the piston 2 is moved to the left side in FIG. , The indicator 5 is slid to the left side of the drawing together with the movement of the piston 2.

Next, when fluid pressure is supplied from the supply / discharge port 7a to the left cylinder chamber 6a, the piston 2 that has moved to the left side in FIG.
Is moved to the right side of the figure, and the indicator 5 that has slid to the left side of the figure by the magnetic attraction of the magnet 3
Are accompanied by the movement of the piston 2 and are slid to the right side in FIG.

In this way, the indicator 5 is slid on the sliding surface of the sliding groove 8b along with the movement of the magnet 3, and the sliding position of this indicator 5 passes through the opening side of the mounting groove 8 to the cylinder main body 1 side. Since it is visually recognized from the outside, the operating position of the piston 2 during operation is recognized by visually recognizing the movement of the indicator 5.

Similarly, even when the piston 2 is stopped, its stop position is recognized.

Further, the indicator 5 displays the second display portion 12, and since the second display portion 12 is aligned with the center position 3a of the magnet 3, the operating position of the piston 2 and the like can be reliably confirmed through the second display portion 12. Be recognized by.

Next, when setting the mounting position of the magnetic sensor 4 to the cylinder body 1, for example, the setting is performed as follows.

First, for example, as shown in FIG. 4, the piston 2 is positioned at a predetermined detected position such as the stroke end on the right end side.

In this case, the indicator 5 is entrained by the piston 2 by the magnetic attraction force of the magnet 3 and is positioned corresponding to the detected position, and the center position 3a of the magnet 3 and the second display portion 12 of the indicator 5 are Second display 12 because it matches
The center position 3a of the magnet 3 is recognized by the display of.

Then, based on the recognition of the center position 3a of the magnet 3, the magnetic sensor 4 in the mounting groove 8 is moved by moving the piston 2 while visually observing the display of the first display portion 11 and the second display portion 12 of the magnetic sensor 4. The first display section 11 and the second display section
By making 12 coincide with each other, the center position 3a of the magnet 3 and the maximum sensitivity position of the magnetic sensor 4 are coincident with each other.

Then, after this position setting, the magnetic sensor 4 is fixed to the mounting groove 8 of the cylinder body 1 by the rotating operation of the cam 10 described above.

Further, according to the present embodiment, the indicator 5 displays the third display section 13 for displaying the operating range of the magnetic sensor 4, so that the operating range of the magnetic sensor 4 is recognized by the third displaying section 13. To be done.

In this case, the third display unit 13 is displayed not on the magnetic sensor 4 side but on the indicator 5 side, so that the third sensor unit 13 is not affected by fluctuations in the operating range of the magnetic sensor 4 due to various magnetic attraction forces of the magnets 3. , The third display section 13 corresponding to its operating range
By using the required indicator 5 with
The operating range of the magnetic sensor 4 is recognized without changing the magnetic sensor 4 side.

Next, according to this embodiment, the indicator 5 and the sliding groove 8b are
Structure in which the indicator 5 is slid on the sliding surface of the sliding groove 8b by partially contacting the surfaces facing each other with the sliding surface, that is, for example, FIGS. 1 (a) and 1 (b). , (C),
As shown in (d), (e), and (f), respectively, the contact area between the opposing surfaces of the indicator 5 and the sliding surface of the sliding groove 8b is reduced, so that The sliding resistance is reduced as compared with the structure in which the opposing surfaces are entirely in contact with each other, so that the operation of the indicator 5 can be facilitated, and the position detection of the operating member by the indicator 5 can be achieved through this smoothing. The accuracy of can be improved.

The present invention has been specifically described above based on the embodiments.
The present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, the cylinder device is applied as the fluid pressure actuating device, but it can also be applied to, for example, a piston of a rotary actuator or a handling actuator, which is an example of the fluid pressure device.

Further, in the above-described embodiment, as a structure in which the opposing surfaces of the indicator 5 and the sliding surface of the sliding groove 8b are partially contacted with each other, the structure shown in FIGS. 1 (a), (b), (c), (D),
Although the structures shown in (e) and (f) are shown, the present invention is not limited to such structures.

For example, the groove 20 in the sliding groove 8b may be made of a material having a low frictional resistance such as resin, or a tape having such a groove 20 may be attached to the sliding groove 8b. . Similarly, the sliding surface of the indicator 5 should be a groove of metal or resin.
It may be a layer.

Further, in the above-mentioned embodiment, the moving position of the piston 2 is detected by visually recognizing the sliding position of the indicator 5, but the present invention is not limited to such a visual detecting structure. Instead, for example, the moving position of the piston 2 can be detected by electrically detecting the sliding position of the indicator 5.

The indicators 5 do not have to be paired as shown in FIG. 2, and one sliding groove 8b is provided at the center of the pair of magnetic sensors 4 as shown in FIGS. 5 (a) and 5 (b). The structure may be provided.

Further, in the present invention, it suffices that the detected portion of the actuating member such as the piston 2 and the indicator 5 are magnetically coupled. Therefore, both the detected portion and the indicator 5 may be formed by magnets. Alternatively, it is possible to use only one of them as a magnet and the other as a magnetic material such as iron.

〔effect〕

The effects obtained by the typical one of the inventions disclosed by the present application will be briefly described as follows.

(1). A structure in which the opposed surfaces of the indicator and the sliding surface are partially contacted with each other and the indicator is slid on the sliding surface so that the opposed surfaces are in full contact with each other. In comparison, since the sliding resistance is reduced, the indicator can be operated smoothly.

(2). Through the smooth operation of the indicator in (1), the accuracy of detecting the position of the operating member by the indicator can be improved.

(3). The effect of (1) and (2) described above is, for example, that a groove extending along the sliding direction of the indicator to reduce the contact area between the facing surfaces is formed on one of the facing surfaces. Can be obtained easily and surely by adopting a structure in which the cross-sectional shape of at least one of the facing surfaces that crosses the sliding direction of the indicator is a convex curved surface. .

[Brief description of drawings]

1 (a), (b), (c), (d), (e),
(F) is an enlarged cross-sectional view showing an indicator and a sliding groove of the fluid pressure actuating device according to an embodiment of the present invention, FIG. 2 is a plan view of the fluid pressure actuating device, and FIG. 3 is FIG. 3 is a partial cross-sectional view taken along line III-III, FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3, and FIG. 5 (a) shows a modification of the fluid pressure actuating device according to the embodiment of the present invention. A sectional view, FIG. 5 (b) is a sectional view taken along the line VV. 1 ... Cylinder body, 1a ... Shading wall, 2 ... Piston (operating member), 2a ... Piston rod, 3 ... Magnet (detected part), 3a ... Center position, 4 ... Magnetic sensor, 4a ...... Mating groove, 4b ...... Slope, 4c ...... Lead wire, 5 ...... Indicator, 6a ...... Left cylinder chamber, 6b ...... Right cylinder chamber, 7
a, 7b ... Supply / exhaust port, 8 ... Mounting groove, 8a ... Slope, 8b
…… Sliding groove, 9 …… Arm, 9a …… Mating groove, 10 …… Cam, 10a …… Driver groove, 10b …… Small diameter part, 10c …… Large diameter part, 11 …… 1st display part 12 …… Second display, 13 …… Third
Display, 20, 21 ... Groove.

Claims (4)

[Scope of utility model registration request] 1. An operating member which is shielded from the outside by a shield wall of a main body and which is magnetically coupled to the detected portion through the shield wall and an operating member having a detected portion, and is accompanied by movement of the operating member. A fluid pressure actuated device comprising an indicator for detecting the position of the actuating member by sliding the indicator and a sliding surface on which the indicator slides,
A fluid pressure actuated device, characterized in that the indicator and the sliding surface are brought into contact with each other only partially on opposite sides thereof to slide the indicator on the sliding surface. 2. A groove extending in the sliding direction of the indicator and formed in one of the facing surfaces to reduce a contact area between the facing surfaces. Fluid pressure operated equipment. 3. The fluid pressure actuating device according to claim 1, wherein at least one of the facing surfaces, which crosses the indicator in the sliding direction, has a convex cross-section. 4. The fluid pressure actuated device according to claim 1, 2 or 3, wherein said indicator is plate-shaped.