JP2021099000A - Position detection device, and industrial machine - Google Patents

Abstract

To improve accuracy in determining whether a movable member is in a predetermined position.SOLUTION: A position detection device comprises: a fixed side member; a movable member relatively moving with respect to the fixed side member; an object to be detected provided in one of the fixed side member and the movable member; and a non-contact sensor provided in the other of the fixed side member and the movable member, and detecting the object to be detected to detect that the movable member is in a predetermined position. The object to be detected includes a face to be detected that is a face at a side corresponding to a detecting face of the non-contact sensor. At least an end portion side region in a relative movement direction of the object to be detected and the non-contact sensor in the face to be detected has a shape moving in a direction going away from the detecting face as going toward an end portion in the relative movement direction of the face to be detected.SELECTED DRAWING: Figure 7

Description

The present invention relates to a position detecting device for detecting that a movable member is in a predetermined position, and an industrial machine such as a construction machine provided with the position detecting device.

Conventionally, a working machine (industrial machine) disclosed in Patent Document 1 is known.
The working machine disclosed in Patent Document 1 supports a swing bracket (movable member) rotatably around an axis extending in the vertical direction on a support bracket (fixed side member) provided at the front portion of the machine body. A work device having a boom, an arm, and a bucket is attached to the swing bracket, and a sensor consisting of a potentiometer for detecting a rotation angle (swing angle) around the swing axis with respect to the support bracket of the swing bracket is provided.

Japanese Unexamined Patent Publication No. 2019-19569

By the way, in a crane-specification work machine equipped with a hanging hook on a bucket, the crane work is performed at a front position where the swing bracket faces the front of the machine body. Therefore, in this type of working machine, it is conceivable to include a position detecting device for detecting whether or not the swing bracket is in the front position.
As the position detecting device, it is not always necessary to detect the swing angle numerically, and it is sufficient if it can detect that the swing bracket is in the front position. Therefore, a subject is provided on one of the support bracket and the swing bracket, and the other is covered. It is conceivable to use a non-contact sensor that detects the sample. However, in that case, if the detection range of the non-contact sensor is wide, the accuracy of determining whether or not the swing bracket is in the front position is lowered.

An object of the present invention is to improve the accuracy of determining whether or not a movable member is in a predetermined position.

The position detecting device according to one aspect of the present invention includes a fixed-side member, a movable member that moves relative to the fixed-side member, a subject provided on one of the fixed-side member and the movable member, and the subject. A non-contact sensor provided on the other side of the fixed side member and the movable member and detecting that the movable member is in a predetermined position by detecting the subject is provided, and the subject is not in contact with the subject. It has a surface to be inspected that corresponds to the detection surface of the sensor, and at least the end side region in the relative movement direction between the subject and the non-contact sensor on the surface to be inspected is the surface to be inspected. It is a shape that shifts away from the detection surface toward the end in the relative movement direction.

According to the above-mentioned position detection device, the detection position when the non-contact sensor detects a predetermined position of the movable member as compared with the case where the test surface has the same distance from the detection surface from the center to the end in the relative movement direction. Can be placed on the center side of the surface to be inspected. This makes it possible to improve the accuracy of determining whether or not the movable member is in a predetermined position.

It is a side view of an industrial machine. It is a top view of an industrial machine. It is a side view of the mounting part of a detection device. It is a top view of the mounting part of the detection device. It is a rear view of the mounting part of a detection device. It is a perspective view of the attachment part of a detection device. It is a perspective view of the detection device with the sensor cover attached. It is a rear view of a subject and a non-contact sensor. It is a figure which shows the comparison of the detection range between the case where a subject is formed by a round bar and the case where a subject is formed by flat steel.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
FIG. 1 is a schematic side view of a working machine 1 which is an example of an industrial machine according to the present embodiment. FIG. 2 is a schematic plan view of the working machine 1. In the present embodiment, a backhoe, which is a swivel work machine, is exemplified as the work machine 1.
As shown in FIG. 1, the working machine 1 includes a traveling body 1A and a working device 4 equipped on the traveling body 1A. The traveling body 1A has a traveling device 3 and an airframe (swivel table) 2 mounted on the traveling device 3. The aircraft 2 is equipped with a cabin 5 and a driver's seat 6 arranged in the cabin 5.

In the present embodiment, the front side of the operator seated in the driver's seat 6 (in the direction of arrow A1 in FIGS. 1 and 2) is in front, the rear side of the operator (in the direction of arrow A2 in FIGS. 1 and 2) is in the rear, and the driver. The left side (direction of arrow B1 in FIG. 2) will be described as the left side, and the right side of the operator (arrow B2 in FIG. 2) will be described as the right side. Further, the horizontal direction, which is a direction orthogonal to the front-rear direction (front-back direction of the machine body) K1, will be described as the body width direction K2 (width direction of the machine body 2). The direction from the central portion to the right portion or the left portion in the width direction of the machine body 2 will be described as the outside of the machine body (outside of the body width direction K2). That is, the outer side of the machine body is the direction K2 in the width direction of the machine body and is away from the center in the width direction of the body body 2. The direction opposite to the outside of the fuselage will be described as the inside of the fuselage (inside in the width direction of the fuselage). That is, the inside of the machine is a direction that is in the width direction of the machine and approaches the center in the width direction of the body 2.

As shown in FIG. 1, the traveling device 3 is a device that supports the body 2 so as to travel. The traveling device 3 is driven by a traveling motor 11 composed of a hydraulic motor (hydraulic actuator), an electric motor, or the like. In this embodiment, the crawler type traveling device 3 is used, but the present invention is not limited to this, and a wheel type traveling device or the like may be used.
As shown in FIGS. 1 and 2, a dozer device 7 is attached to the front portion of the traveling device 3. The dozer device 7 has a blade (soil removal plate) 7A, a dozer arm (driven member) 7B fixed to the back side of the blade 7A, and a dozer cylinder (hydraulic cylinder) 7C for moving the dozer arm 7B up and down. There is. The rear portion of the dozer arm 7B is pivotally supported by the frame of the traveling device 3 so as to be vertically movable. The dozer cylinder 7C is provided over the middle portion of the dozer arm 7B and the frame of the traveling device 3, and can be moved up and down (raised and lowered) by expanding and contracting the dozer arm 7B (blade 7A). Specifically, the dozer cylinder 7C is extended to raise the dozer arm 7B, and contracted to lower the dozer arm 7B.

The machine body 2 has a swivel board 9 formed of a steel plate or the like constituting the bottom, and the swivel board 9 can swivel around a swivel axis X1 extending in the vertical direction on a traveling device 3 via a swivel bearing 8. Is supported by. A weight 10 is provided at the rear of the machine body 2. In addition, a prime mover is mounted on the rear part of the machine body 2. The prime mover is a diesel engine. The prime mover may be a gasoline engine or an electric motor, or may be a hybrid type having an engine and an electric motor.

The machine body 2 has a support bracket (fixed side member) 20 and a swing bracket (movable member) 21 for supporting the work device 4 at the front portion. The support bracket 20 is provided so as to project forward from the machine body 2. The support bracket 20 is provided so as to deviate from the center of the body 2 in the width direction K2 to one side (to the right). A swing bracket 21 is swingably attached to the front portion of the support bracket 20 (a portion protruding from the machine body 2) around a vertical axis (an axial center extending in the vertical direction).

As shown in FIG. 2, the swing bracket 21 is driven by the swing cylinder 22. The swing cylinder 22 is composed of an expandable and contractible hydraulic cylinder, and expands and contracts to swing the swing bracket 21.
As shown in FIG. 1, the work device 4 includes a boom device 30, an arm device 40, and a work tool device 50. The boom device 30 has a boom 31 and a boom cylinder 32. The boom 31 is rotatably supported on the upper portion of the swing bracket 21 via a horizontal shaft 35 extending in the width direction of the machine body K2. The boom cylinder 32 is composed of an expandable and contractible hydraulic cylinder, and is provided between the swing bracket 21 and the middle portion of the boom 31, and the boom 31 is swung by expanding and contracting.

The arm device 40 has an arm 41 and an arm cylinder 42. The base end portion of the arm 41 is swingably supported by the tip end portion of the boom 31 via the horizontal shaft 43. The arm cylinder 42 is composed of a stretchable hydraulic cylinder, is provided over the base of the arm 41 and the middle part of the boom 31, and swings the arm 41 by expanding and contracting.
The work tool device 50 has a bucket 51 as a work tool and a bucket cylinder 52 as a work tool cylinder. The bucket 51 is swingably supported by the tip of the arm 41 via the pivot 57. The bucket cylinder 52 is composed of a stretchable hydraulic cylinder, and is provided over a link mechanism 53 provided between the bucket 51 and the tip of the arm 41 and the base of the arm 41. The bucket 51 can be expanded and contracted to extend the bucket 51. Swing.

As shown in FIG. 3, the reinforcing member 111 is fixed on the swivel board 9. The support bracket 20 has an upper plate 20A fixed to the upper part of the reinforcing member 111, and a lower plate 20B fixed to the lower part of the swivel board 9 and the reinforcing member 111. The swing bracket 21 has an upper pivot portion 21A pivotally supported on the upper plate 20A via a pivot shaft (upper swing shaft) 112A and a lower pivot branch portion pivotally supported on the lower plate 20B via a pivot shaft (lower swing shaft) 112B. It has 21B. The upper swing shaft 112A and the lower swing shaft 112B have an axial center (swing axis X2) extending in the vertical direction and are arranged concentrically. Therefore, the swing bracket 21 moves relative to the support bracket 20 in the horizontal direction (airframe width direction K2) around the swing axis X2. The upper pivot 21A and the lower pivot 21B are provided at the rear of the swing bracket 21.

The upper pivot branch 21A is formed in a bifurcated shape having an upper wall 114A arranged on the upper surface side of the upper plate 20A and a lower wall 115A arranged on the lower surface side of the upper plate 20A. The upper swing shaft 112A penetrates the upper wall 114A, the upper plate 20A, and the lower wall 115A.
As shown in FIG. 6A, the upper portion of the upper swing shaft 112A projects upward from the upper wall 114A, and the mounting plate 116 is fixed to the protruding portion. As shown in FIG. 4, the mounting plate 116 is fixed to the upper wall 114A by bolts 117. Therefore, the upper swing shaft 112A rotates integrally with the swing bracket 21 around the swing axis X2.

As shown in FIGS. 3 and 6A, an index portion 118 is provided at the rear portion of the upper wall 114A so as to project rearward. 3 to 6A show a state in which the swing bracket 21 is in the front position (predetermined position) 119 facing the front of the machine body 2. When the swing bracket 21 is in the front position 119, the index unit 118 faces the rear of the aircraft 2. By recognizing the index unit 118, the operator can visually confirm that the swing bracket 21 is at the front position 119.

As shown in FIGS. 3 to 6A, a detection device (position detection device) 120 for detecting that the swing bracket 21 is at the front position 119 is arranged on the front side of the support bracket 20. The detection device 120 has a subject 121 and a non-contact sensor 122. In the present embodiment, the subject 121 is attached to the support bracket (fixed side member) 20 side, and the non-contact sensor 122 is attached to the swing bracket (movable member) 21 side. As shown in FIG. 4, the subject 121 and the non-contact sensor 122 move relative to each other in the horizontal direction (relative movement direction K3) by swinging the swing bracket 21 with respect to the support bracket 20. When the non-contact sensor 122 detects the subject 121, it can be determined that the swing bracket 21 is in the front position 119.

The subject 121 is located above the index portion 118, and is attached to the upper plate 20A (support bracket 20) by the subject bracket 123. The subject bracket 123 has a base plate 124 and a vertical plate 125 erected on the base plate 124. The base plate 124 is arranged behind the upper wall 114A and is fixed to the upper plate 20A by bolts 126. As shown in FIG. 5, the lower portion 125a of the vertical plate 125 is fixed by being biased from the central portion of the base plate 124 in the machine width direction K2 to one side (right side) of the machine width direction K2. Specifically, the lower portion 125a of the vertical plate 125 is located to the right of the index portion 118 with the swing bracket 21 at the front position 119. As a result, the vertical plate 125 is arranged so as not to interfere with the swing bracket 21 even if the swing bracket 21 is rotated. As shown in FIGS. 3 and 6A, the lower portion 125a of the vertical plate 125 has an inclined shape that shifts backward as it goes upward. As shown in FIG. 5, the upper portion 125b of the vertical plate 125 arranged above the index portion 118 is formed in an inclined shape that shifts to the left as it goes upward.

As shown in FIG. 3, the subject 121 is formed of a round bar (cylindrical bar), is stretched (horizontally) in the front-rear direction K1, and the rear portion is fixed to the upper end portion of the vertical plate 125. Has been done. The subject 121 may be a solid bar or may be formed of a pipe-shaped bar.
As shown in FIGS. 3, 5, and 6A, the non-contact sensor 122 is arranged so as to be located above the subject 121 when the swing bracket 21 is in the front position 119. Specifically, the non-contact sensor 122 has the subject 121 so that the center of the detection surface 122a in the body width direction K2 coincides with the center of the subject 121 in the body width direction K2 when the swing bracket 21 is in the front position 119. Placed above.

The non-contact sensor 122 is composed of a proximity sensor. The non-contact sensor 122 is attached to the swing bracket 21 by the sensor bracket 127. Specifically, the non-contact sensor 122 is integrally rotatably attached to the swing bracket 21 around the swing axis X2 via the sensor bracket 127, the upper swing shaft 112A, and the mounting plate 116.

As shown in FIG. 4, when the swing bracket 21 swings in the arrow K4 direction (left) around the swing axis X2 from the state where the swing bracket 21 is in the front position 119, the non-contact sensor 122 moves in the arrow K5 direction (right). ), And deviates from the upper position of the subject 121. Further, when the swing bracket 21 swings in the arrow K6 direction (right) around the swing axis X2 from the front position 119, the non-contact sensor 122 moves in the arrow K7 direction (left). It deviates from the upper position of the subject 121.

As shown in FIGS. 3 and 6A, the sensor bracket 127 includes a mounting wall 127a which is overlapped on the upper surface of the upper swing shaft 112A and mounted by a bolt 128, and a vertical wall 127b extending upward from the rear end of the mounting wall 127a. It has a support wall 127c extending rearward from the upper end of the vertical wall 127b. A non-contact sensor 122 is attached to the support wall 127c. A harness stay 129 is fixed to the vertical wall 127b. A connector 130A provided at the end of the harness 130 connected to the non-contact sensor 122 is attached to the harness stay 129.

As shown in FIG. 5, the non-contact sensor 122 is covered with a sensor cover 131. The sensor cover 131 is attached to a cover bracket 132 fixed to the sensor bracket 127. The cover bracket 132 is formed in a gate shape having a left side wall 132a, a right side wall 132b, and an upper wall 132c connecting the upper portions of the left side wall 132a and the right side wall 132b. Further, as shown in FIG. 6B, an index portion 131b is formed at the rear portion of the upper wall 131a of the sensor cover 131. As shown in FIG. 4, the index unit 131b is formed at a position on a straight line X3 in the front-rear direction K1 of the aircraft passing through the swing axis X2 when the swing bracket 21 is at the front position 119. By recognizing the index unit 131b, the operator visually confirms that the swing bracket 21 is in the front position 119 even when the index unit 118 provided on the swing bracket 21 cannot be seen by the sensor cover 131. can do. The sensor cover 131 may be provided with the index unit 131b, and the swing bracket 21 may not be provided with the index unit 118. A harness guide 133 that guides the harness 130 is fixed to the cover bracket 132.

As shown in FIG. 7, the subject 121 has a surface to be inspected 121a, which is a surface on the side corresponding to the detection surface 122a of the non-contact sensor 122. The test surface 121a is the upper surface (upper half surface) of the subject 121. Specifically, the test surface 121a is the upper surface of the subject 121, which extends from the end portion 121b on one end side in the radial and horizontal directions of the subject 121 to the end portion 121c on the other end side.

The end side regions 121d and 121e of the relative movement direction K3 between the subject 121 and the non-contact sensor 122 on the test surface 121a are detected as the detection surfaces 122a toward the ends 121b and 121c of the relative movement direction K3 of the test surface 121a. It is a shape that shifts in the direction K8 away from.
In the present embodiment, since the subject 121 is formed by a round bar, the test surface 121a shifts to the direction K8 away from the detection surface 122a as it goes from the central CL in the relative movement direction K3 toward both ends 121b and 121c. It is formed on a curved surface (arc surface) that inclines so as to.

FIG. 8 shows a comparison of the detection range W between the case where the subject 121 is formed of the round bar 121A and the case where the subject 121 is formed of the flat steel 121B. In FIG. 8, E1 shows a detection area (operating area) of the non-contact sensor 122. R1 is an outer shell line indicating the outer shell on one side in the horizontal direction of the detection region E1. R2 is an outer shell line indicating the outer shell on the other side in the horizontal direction of the detection region E1.
When the swing bracket 21 is swung toward the front position 119 from the position where the detection region E1 of the non-contact sensor 122 is deviated from the subject 121 in the direction of arrow K5, the non-contact sensor 122 moves in the direction of arrow K7. When the subject 121 is a flat steel 121B, the flat steel 121B is detected when the non-contact sensor 122 moves until the outer line R1 comes to the Y1 position, and when the subject 121 is a round bar 121A, the outer line R1 When the non-contact sensor 122 moves until it reaches the Y2 position, the round bar 121A is detected.

Further, when the swing bracket 21 is swung toward the front position 119 from the position where the detection region E1 of the non-contact sensor 122 is deviated from the subject 121 in the direction of arrow K7, the non-contact sensor 122 moves in the direction of arrow K5. To do. When the subject 121 is a flat steel 121B, the flat steel 121B is detected when the non-contact sensor 122 moves until the outer line R1 reaches the Y3 position, and when the subject 121 is a round bar 121A, the outer line R1 is detected. When the non-contact sensor 122 moves until it reaches the Y4 position, the round bar 121A is detected.

As can be seen from FIG. 8, when the distance from the non-contact sensor 122 to the non-specimen 121 and the width in the moving direction of the subject 121 are the same, the detection range W1 when the subject 121 is the flat steel 121B is compared with the detection range W1. When the subject 121 is the round bar 121A, the detection range W2 is narrow. That is, the detection position when the non-contact sensor 122 detects the front position 119 of the swing bracket 21 can be set closer to the central CL side of the test surface 121a than in the case of the flat steel 121B. In other words, the swing bracket 21 is swung in one direction from the position where the detection region E1 of the non-contact sensor 122 is out of the subject 121, and after the non-contact sensor 122 detects the subject 121, the subject 121 The detection angle, which is the swing angle (swing angle) of the swing bracket 21 until the detection is stopped, can be reduced. As a result, the accuracy of determining whether or not the swing bracket 21 is at the front position 119 can be improved.

As a method of reducing the detection angle, it is conceivable to reduce the width of the relative movement direction K3 of the subject 121, but since the work machine 1 may be installed in a place exposed to earth and sand during excavation, The strength aspect cannot be ignored and there is a limit to how small it can be. Further, in general, the detection area E1 of the proximity sensor 122 becomes narrower as it is farther from the detection surface 122a. Utilizing this characteristic, it is possible to reduce the detection angle by installing the subject 121 vertically away from the detection surface 122a, but if it is too far away, the detection itself will not be possible, so this method is a component. In addition to being affected by the accuracy of the product, strict dimensional control is required even when assembling.

In the present embodiment, the detection angle can be reduced while ensuring the strength of the component. In addition, the detection angle can be reduced without requiring severe component accuracy and assembly accuracy.
In the present embodiment, the subject 121 is formed by the round bar 121A, but is not limited thereto. For example, the subject 121 may be formed by bending a flat plate so that the surface to be inspected 121a has a curved shape that is convex toward the detection surface 122a. Further, the central CL side of the surface to be inspected 121a in the relative moving direction K3 may be formed flat. That is, at least the end side regions 121d and 121e of the test surface 121a may be shaped so as to move away from the detection surface 122a toward the ends 121b and 121c of the relative movement direction K3 of the test surface 121a. .. Further, the shape of the end side regions 121d and 121e does not necessarily have to be curved, and may be flat. Further, the subject 121 may be attached to the swing bracket 21 and the non-contact sensor 122 may be attached to the support bracket 20. Further, the detection device 120 does not have to determine whether or not the swing bracket 21 is in the front position 119. That is, it has a movable member that moves relative to the fixed side member, a subject 121 is provided on one of the fixed side member and the movable member, and a non-contact sensor 122 is provided on the other, and the non-contact sensor 122 is the subject 121. Anything that detects that the movable member is in a predetermined position by detecting the above is sufficient.

The detection device 120 is provided on one of a fixed side member (support bracket 20), a movable member (swing bracket 21) that moves relative to the fixed side member 20, and the fixed side member 20 and the movable member 21. A non-contact sensor 122 provided on the other side of the subject 121, the fixed side member 20 and the movable member 21, and detecting that the movable member 21 is in a predetermined position (front position 119) by detecting the subject 121. The subject 121 has a surface 121a on the side corresponding to the detection surface 122a of the non-contact sensor 122, and the relative movement of the subject 121 and the non-contact sensor 122 on the surface 121a At least the end side regions 121d and 121e of the direction K3 are shaped so as to move away from the detection surface 122a toward the ends 121b and 121c of the relative movement direction K3 of the surface to be inspected 121a.

According to this configuration, when the non-contact sensor 122 detects a predetermined position 119 of the movable member 21, as compared with the case where the test surface 121a has the same distance from the detection surface 122a from the center to the end in the relative moving direction K3. The detection position can be set to the center side of the surface to be inspected 121a. This makes it possible to improve the accuracy of determining whether or not the movable member 21 is in a predetermined position.
Further, the test surface 121a may be formed as a curved surface that is inclined so as to shift from the center of the relative movement direction K3 toward both end portions 121b and 121c in the direction K8 away from the detection surface 122a.

Further, the subject 121 is formed by the round bar 121A and is arranged in a direction in which the axial centers intersect the relative movement direction K3.
According to this configuration, the subject 121 having the end side regions 121d and 121e having a shape that shifts to the direction K8 away from the detection surface 122a toward the ends 121b and 121c of the relative movement direction K3 of the test surface 121a can be easily provided. Can be formed into.

Further, the movable member 21 is rotatably supported around the pivot 112A having an axis (swing axis X2) extending in the vertical direction on the fixed side member 20, and is integrally rotated with the pivot 112A to be a subject. The 121 may be attached to the fixed side member 20, and the non-contact sensor 122 may be attached to the pivot 112A so as to move above the subject 121 in the relative movement direction K3.

Further, the work machine (industrial machine) 1 extends in the vertical direction to the machine body 2, the position detection device 120, the support bracket 20 which is a fixed side member provided on the machine body 2, and the support bracket 20. A swing bracket 21 which is a movable member rotatably supported around a pivot 112A having an axis X2 is provided, and a predetermined position 119 is a position where the swing bracket 21 faces the front side of the machine body 2.

According to this configuration, it is possible to improve the accuracy of determining whether or not the swing bracket 21 is in the predetermined position 119.
Although one embodiment of the present invention has been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

2 Aircraft 20 Fixed side member (support bracket)
21 Movable member (swing bracket)
112A Axis 119 Predetermined position (front position)
120 Detection device (position detection device)
121 Subject 121A Round bar 121a Test surface 121d End side area 121b End part 121c End part 121e End side area 122 Non-contact sensor 122a Detection surface K3 Relative movement direction K8 Direction to move away X2 Axis center (swing axis)

Claims (5)

Fixed side member and
A movable member that moves relative to the fixed side member,
A subject provided on one of the fixed side member and the movable member,
A non-contact sensor provided on the other side of the fixed side member and the movable member and detecting that the movable member is in a predetermined position by detecting the subject.
With
The subject has a surface to be inspected, which is a surface on the side corresponding to the detection surface of the non-contact sensor.
At least the end side region in the relative movement direction between the subject and the non-contact sensor on the test surface shifts toward the end in the relative movement direction of the test surface in a direction away from the detection surface. A position detector that is a shape. The position detection device according to claim 1, wherein the test surface is formed on a curved surface that is inclined so as to move away from the detection surface as it moves from the center to both ends in the relative movement direction. The position detection device according to claim 1 or 2, wherein the subject is formed of a round bar and is arranged in a direction in which the axes intersect in the relative movement direction. The movable member is rotatably supported around a pivot having an axial center extending in the vertical direction on the fixed side member, and is integrally rotated with the pivot.
The subject is attached to the fixed side member and
The position detection device according to any one of claims 1 to 3, wherein the non-contact sensor is attached to the pivot and moves above the subject in the relative movement direction. With the aircraft
The position detection device according to any one of claims 1 to 4,
A support bracket, which is a fixed-side member provided on the machine body, and
A swing bracket, which is a movable member rotatably supported around a pivot having an axial center extending in the vertical direction on the support bracket,
With
The predetermined position is an industrial machine in which the swing bracket faces the front side of the airframe.

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