JP2877716B2 - Backhoe arm angle detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backhoe arm angle detecting device.

[0002]

2. Description of the Related Art Generally, a backhoe for civil engineering construction machines supports a swivel having a driving unit on a traveling device, and pivots a lower part of a boom on the swivel, and attaches an upper part of an arm to an upper part of the boom. A pivot is provided, and a bucket is provided below the arm, and the boom, the arm, and the bucket are configured to swing by a hydraulic cylinder.

[0003] Some backhoes are provided with an interference preventing device so that the bucket does not interfere with the driving section or the sunshade or cabin covering the driving section.
The anti-interference device is provided with a swing angle of the boom with respect to the turntable,
A sensor is provided to detect the swing angle of the arm with respect to the boom and the swing angle of the bucket with respect to the arm. The position of the bucket is detected by these sensors, and when the bucket attempts to enter the interference area with the driver's seat or the like, the hydraulic cylinder Is forcibly returned to the neutral position to stop the boom, arm, and bucket.

[0004] An arm sensor for detecting the swing angle of the arm with respect to the boom is attached and fixed to the upper outer surface of the boom, and is linked to the upper part of the arm by a link mechanism.

[0005]

In the prior art, since the arm sensor is attached and fixed to the outer surface of the boom, it hits something during excavation, etc. And the arm sensor may be damaged. Therefore, an object of the present invention is to provide a backhoe arm angle detection device that aims to prevent damage to an arm sensor in view of the above problems.

[0006]

The first technical means taken by the present invention to achieve the above object is that a lower part of a boom 11 is supported on a fuselage 2 so as to be rotatable around a left-right axis. The upper part of the arm 12 is attached to the upper side of the
A pair of left and right support plates 23 are fixed to the upper part of the arm 12 so as to protrude upward, and a cylinder rod 25 of the hydraulic cylinder 17 is provided between the left and right support plates 23.
The front end boss 25a is rotatably supported around a pivot 24 in the left-right direction, and the cylinder body of the hydraulic cylinder 17 is supported rotatably around the left-right axis on the boom 11 side. The arm 12 is configured to swing the arm 12 around the support shaft 16 with respect to the boom 11 and an arm sensor 27 for detecting a swing angle of the arm 12 with respect to the boom 11 is provided. Are arranged between the left and right support plates 23 at a distance from the boss portion 25a of the cylinder rod 25, and are fixedly attached to the support plate 23.
In order to detect the relative rotation angle of the boss 25a around the pivot 24, an interlocking mechanism 37 for interlocking and connecting the boss 25a and the arm sensor 27 is provided between the left and right support plates 23. Are provided on the support plate 2 between the lower cover 35 and the arm 12.
The point is that a hydraulic hose 38 for the hydraulic cylinder 18 for operating the bucket 13 is inserted between the three.

The second technical means is that the lower part of the boom 11 is supported on the body 2 so as to be rotatable around the left-right axis, and the upper part of the arm 12 is supported on the upper side of the boom 11 by the left-right support shaft 1.
A pair of left and right support plates 23 is fixed to the upper part of the arm 12 so as to protrude upward, and the cylinder rod 2 of the hydraulic cylinder 17 is interposed between the left and right support plates 23.
5, a boss 25a at the tip end is rotatably supported around a pivot 24 in the left-right direction, and a cylinder body of the hydraulic cylinder 17 is rotatably supported around the left-right axis on the boom 11 side.
A backhoe comprising an arm sensor 27 for detecting the swing angle of the arm 12 with respect to the boom 11 while the arm 12 is caused to swing with respect to the boom 11 by the expansion and contraction of the hydraulic cylinder 17 around the support shaft 16. In the above, the arm sensor 27 is disposed between the left and right support plates 23 at the pivotally connected portion of the boss 25a of the cylinder rod 25, and is fixed to the support plate 23 side. Rod 2
In order to detect the relative rotation angle of the boss 25a around the pivot 24, an interlocking mechanism 50 that interlocks and connects the boss 25a and the arm sensor 27 is provided between the left and right support plates 23. A cover 48 for covering the arm sensor 27 is provided on the support plate 23 between the cover 48 and the arm 12.
The point is that a hydraulic hose 38 for the hydraulic cylinder 18 for operating the bucket 13 is inserted therebetween.

[0008]

The arm sensor 27 is disposed between the left and right support plates 23 and fixed to the support plate 23.
In order to detect the relative rotation angle of the boss 25a of the cylinder rod 25 around the pivot 24 with respect to the support plate 23, the interlocking mechanisms 37 and 50 for interlocking the boss 25a and the arm sensor 27 are connected to each other between the left and right support plates 23. And a cover 34, 35, 48 for covering the arm sensor 27, and a hydraulic hose 38 for the hydraulic cylinder 18 for operating the bucket 13 between the covers 35, 48 and the arm 12 and between the support plates 23. The insertion prevents the arm sensor 27 and the hydraulic hose 38 from being damaged, and the covers 35 and 48 prevent the hydraulic hose 38 and the arm sensor 27 from being damaged.
Can be avoided.

The arm sensor 27 is connected to the left and right support plates 2.
3, the space for mounting the arm sensor 27 is narrowed, whereby the passage of the hydraulic hose 38 is widened. Since the mounting space for the arm sensor 27 is reduced, the cover 4 for protecting the arm sensor 27 is provided.
8 is one and small.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 9 show a first embodiment. In the general views shown in FIGS. 2 to 5, reference numeral 1 denotes a backhoe, and the backhoe 1 is composed of a fuselage 2 and an excavator 3, and the fuselage 2 is a rubber crawler type. A turning table 5 is supported on the upper part of the traveling device 4 so as to be turnable around a vertical axis. A dozer 6 is provided at a front portion of the traveling device 4, and a driving unit 9 including a control device 7 having an operation lever and the like and a driver's seat 8 and the like are provided at the upper left side of the swivel 5. On the right side of the driver's seat 8, a canopy (shade) 10 is provided.

The excavator 3 is disposed on the right side of the canopy 10 and includes a boom 11, an arm 12, and a bucket 13. The boom 11 has a first boom member 11a whose lower side is rotatably supported by a swivel 5 around a rotation shaft 14 in the left-right direction, and a lower side pivotally pivotable on the upper side of the first boom member 11a. Second boom member 11b connected and supported
And a support bracket 11c pivotally connected to the upper part of the second boom member 11b so as to be able to swing left and right.

Then, the first boom member 11a and the swivel 5
Between the boom cylinder 15 and the hydraulic cylinder
The boom 11 is swung about the rotation axis 14 by the expansion and contraction of the boom cylinder 15. Arm 1
The upper end of the arm 12 and the support bracket 11 are supported by a bifurcated portion above the support bracket 11c so as to be rotatable around the support shaft 16 via a horizontal support shaft 16.
and the arm cylinder 17 formed of a hydraulic cylinder interposed between the support shaft 16 and the support shaft 16. Note that the cylinder body of the arm cylinder 17 is pivotally attached to a lower portion of the support bracket 11c so as to be rotatable around a left-right axis.

The bucket 13 is supported by the lower part of the arm 12 so as to be rotatable around the left and right axes.
The bucket is driven by a bucket cylinder 18 composed of a hydraulic cylinder interposed between it and the upper part. First
A link 19 is attached between the vicinity of the upper part of the boom member 11a and the support bracket 11c, and the link 19 and the first boom member 11a,
A parallel quadruple link is constituted by the second boom member 11b and the support bracket 11c, and the first boom member 11a
By swinging the second boom member 11b by the hydraulic cylinder 20 interposed between the second boom member 11b and the second boom member 11b, the arm 12 and the bucket 13 are translated in the left-right direction as shown in FIG. It is configured to be able to.

As shown in FIGS. 1 and 6 to 9, a cylindrical portion 21 which is fitted to and supported on the support shaft 16 is fixed to an upper end portion of the arm 12, and the cylindrical portion 21 extends downward from the cylindrical portion 21. A plate 22 is welded and fixed to the front side of the arm 12, and a pair of left and right support plates 23 are welded and fixed on the plate 22 so as to protrude upward with an interval left and right. A boss 25a fixed to the distal end of a cylinder rod 25 of the arm cylinder 17 is rotatably supported on the upper part between the left and right support plates 23 via a pivot 24 in the left-right direction. A bracket 26 is fixed to the boss 25a so as to protrude radially outward.

The support plate 2 between the pivot 24 and the support shaft 16
An arm sensor 27 for detecting a swing angle of the arm 12 with respect to the boom 11 is provided between the arm 3 and the arm sensor 27. The arm sensor 27 is composed of a rotary potentiometer and has a holder 28.
And is fixedly attached to the inner surface of the left support plate 23 via the.
The arm sensor 27 is provided with a bracket 29 that is interlocked with a wiper that slides on the resistance element so as to protrude radially outward. The bracket 29 and the boss 25 a of the cylinder rod 25 are provided. Bracket 26,
It is connected by connecting rods 31 having ball joints 30 at both ends. The boss 25a and the arm sensor 27 are formed by the brackets 26 and 29 and the connecting rod 31 or the like.
And an interlocking mechanism 37 for interlocking and linking.

FIGS. 1 and 6 show a state in which the arm cylinder 17 is extended most. When the arm cylinder 17 is contracted from this state, the arm 12 swings upward around the support shaft 16 and the support plate 23 Is rotated about the support shaft 16, the bracket 29 is rotated relatively in the direction of the arrow A in FIG. 1 by being relatively pressed by the connecting rod 31, the wiper of the arm sensor 27 is rotated, and the boom 11 is rotated. Arm 1 against
The swing angle around the second support shaft 16 is detected. Then, when the arm cylinder 17 is most contracted, the bracket 29 rotates to a position indicated by a virtual line in FIGS. 1 and 9.

A reinforcement plate 32 is disposed in front of the arm sensor 27 between the left and right support plates 23, and the reinforcement plate 32 connects the left and right support plates 23 and has a nut 33 fixed to the lower surface side. Further, an arm sensor 27 between the left and right support plates 23 is provided.
Covers 34 and 35 that cover the arm sensor 27 and the interlocking mechanism 37 are arranged above and below, respectively.

The upper cover 34 extends from the upper end of the left and right support plate 23 to the front of the arm sensor 27, and protects the arm sensor 27 from earth and sand from above the arm sensor 27. Also, the upper cover 34
The upper part of the nut 3 is attached to and supported by the left and right support plates 23 so as to be rotatable around the left and right axes, and the lower part is overlapped on the reinforcing plate 32 and the nut 3 is inserted through the cover 34 and the reinforcing plate 32.
3 is attached and fixed by a bolt 36 screwed to the upper cover 3 by removing the bolt 36.
4 can be pivoted upward so that the arm sensor 27
In addition, it is configured so that attachment and detachment and maintenance of the interlocking mechanism 37 can be easily performed.

The lower cover 35 is bent in a rectangular shape, and the first cover 35 is located between the arm sensor 27 and the support shaft 16.
It comprises a cover portion 35a and a second cover portion 35b located on the rear side of the arm sensor 27, and protects the arm sensor 27 from earth and sand from between the support shaft 16 and the pivot 34. The lower cover 35b is welded and fixed to the left and right support plates 23, and also has a function as a reinforcing member for the support plates 23.

The first cover part 3 of the lower cover 35
A pair of hydraulic hoses 38 connected to the bucket cylinder 18 are inserted between the left and right support plates 23 between the cylinder portion 5a and the cylindrical portion 21. Protected from other contact objects. Also, the first cover portion 35a allows the arm 1
When the hydraulic hose 2 swings, interference with the arm sensor 27 due to the bending of the hydraulic hose 38 is prevented, and it also functions as a guide when the hydraulic hose 38 is inserted.

A restricting plate 39 is provided on the lower front side of the left and right support plates 23 for restricting the hydraulic hose 38 from protruding from between the left and right support plates 23 when the hydraulic hose 38 bends. I have. The hydraulic hose 38 passes through the inside of the support bracket 11c and is arranged along the upper surface side of the second boom member 11b, and is connected to the control valve. In addition,
The backhoe 1 includes, in addition to the arm sensor 27, a sensor for detecting a swing angle of the first boom member 11a with respect to the turntable 5, and a second boom member 1 with respect to the first boom member 11a.
1b, and a sensor for detecting a swing angle of the bucket 13 with respect to the arm 12. The sensors detect the position of the bucket 13, and the bucket 13 interferes with the driving unit 9 or the like. In order to move the boom 11, the arm 12, and the bucket 13, the control valve of the hydraulic cylinder is forcibly returned to the neutral position.

FIGS. 10 to 12 show a second embodiment, in which an arm sensor 27 is provided at a pivotally attached portion of a boss 25a of a cylinder rod 25 of an arm cylinder 17. FIG. The arm sensor 27 is mounted on a forked mounting bracket 40, and the mounting bracket 40 is mounted and fixed to an oval mounting section 41 a of a support member 41 fixed to the support plate 23 by a bolt 43 and a nut 44. . The pivot 24
Are supported by the support plate 23 through the support member 41.

The arm sensor 27 supports a lever member 45 interlocked with a wiper that slides on the resistance element so as to be rotatable about an axis perpendicular to the axis of the pivot 24. The lever member 45 has a long hole 4 in its longitudinal direction.
6 are formed. On the other hand, an engaging rod 47 inserted into the elongated hole 46 of the lever member 45 is fixed to the boss 25a of the arm cylinder 17 so as to protrude radially outward.

Therefore, when the boss 25a and the support plate 23 are relatively rotated about the pivot 24 by the expansion and contraction of the arm cylinder 17, the lever member 45 is swung by the engaging rod 47, and the wiper of the arm sensor 27 is turned. As a result, the swing angle of the arm 12 around the support shaft 16 with respect to the boom 11 is detected. The lever member 45 and the engaging rod 47 constitute an interlocking mechanism 50 that interlocks and connects the boss 25a and the arm sensor 27.

The arm sensor 27 is protected from the upper part to the lower part by an arc-shaped cover 48. The upper part of the cover 48 is similar to that of the first embodiment.
Is rotatably supported around the left and right axes, and the lower part is a support shaft 16.
And the left and right ends are disposed between the left and right support plates 2.
It is removably attached and fixed to the reinforcing plate 49 welded to 3 by bolts. The portion of the reinforcing plate 49 that interferes with the cylinder rod 25 is cut off (or provided at a position where it does not interfere).

As described above, by providing the arm sensor 27 at the pivotal portion of the boss 25a of the cylinder rod 25 of the arm cylinder 17, the mounting space for the arm sensor 27 can be narrowed as compared with the first embodiment. This has the advantage that the passage of the hydraulic hose 38 can be widened. Also, since the mounting space for the arm sensor 27 can be narrowed, the cover 48 for protecting the arm sensor 27 is provided.
There is only one and it is small.

[0027]

According to the present invention, the arm sensor 27 is arranged between the left and right support plates 23 and fixed to the support plate 23. The boss 25a of the cylinder rod 25 with respect to the support plate 23 is fixed by the arm sensor 27. Boss 25a and arm sensor 2 to detect the relative rotation angle of
7 are provided between the left and right support plates 23 to cover the arm sensor 27.
4, 35, 48, covers 35, 48 and arm 12
Since the hydraulic hose 38 for the hydraulic cylinder 18 for operating the bucket 13 was inserted between the support plates 23 between
The arm sensor 27 and the hydraulic hose 38 can be prevented from being damaged.
And the arm sensor 27 can be avoided.

In particular, in the case where the arm sensor 27 is disposed between the left and right support plates 23 at the pivotally connected portion of the boss 25a of the cylinder rod 25, the mounting space for the arm sensor 27 can be reduced. By hydraulic hose 3
Since the passage 8 can be widened and the mounting space for the arm sensor 27 can be narrowed, there is an effect that only one cover 48 for protecting the arm sensor 27 can be used and small.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a main part according to a first embodiment.

FIG. 2 is an overall side view of the backhoe.

FIG. 3 is an overall front view of the backhoe.

FIG. 4 is an overall plan view of the backhoe.

FIG. 5 is a side view of the backhoe showing the movement of the excavator.

FIG. 6 is a side view of a main part according to the first embodiment.

FIG. 7 is a view shown by an arrow B in FIG. 6;

FIG. 8 is a perspective view of an upper cover.

FIG. 9 is a side sectional view of a main part showing an operation state.

FIG. 10 is a side view of a main part according to a second embodiment.

FIG. 11 is a front view of a main part according to a second embodiment.

FIG. 12 is an exploded perspective view of a main part according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Backhoe 2 Airframe 11 Boom 12 Arm 13 Bucket 16 Support shaft 17 Arm cylinder 23 Support plate 24 Axis 25 Cylinder rod 25a Boss 27 Arm sensor 34 Cover 35 Cover 37 Interlocking mechanism 38 Hydraulic hose

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 9/26 E02F 9/24

Claims (2)

(57) [Claims] 1. A lower part of a boom (11) is rotatably supported on a body (2) around a left-right axis, and an upper part of an arm (12) is supported on an upper side of the boom (11) by a horizontal support shaft (16). A) a pair of left and right support plates (23) are fixed to the upper part of the arm (12) so as to protrude upward, and a hydraulic cylinder (17) is provided between the left and right support plates (23). The boss (25a) at the tip of the cylinder rod (25) is rotatably supported around a pivot (24) in the left-right direction, and the cylinder body of the hydraulic cylinder (17) is pivoted around the boom (11). The arm (12) is configured to swing about the support shaft (16) with respect to the boom (11) by expansion and contraction of the hydraulic cylinder (17). ) To the arm (1
2) In the backhoe provided with the arm sensor (27) for detecting the swing angle, the arm sensor (27) is spaced from the boss (25a) of the cylinder rod (25) between the left and right support plates (23). And is fixed to the support plate (23) by the arm sensor (27).
In order to detect the relative rotation angle of the boss portion (25a) of the cylinder rod (25) around the pivot (24) with respect to the boss portion (25a) and the arm sensor (27), an interlocking mechanism (37) is connected. A cover (3) is provided between the left and right support plates (23) and covers the arm sensor (27) above and below the arm sensor (27).
4) and (35), and the bucket (1) is provided between the support plate (23) between the lower cover (35) and the arm (12).
A backhoe arm angle detecting device, wherein a hydraulic hose (38) for a hydraulic cylinder (18) for performing the operation of 3) is inserted therethrough. 2. A lower part of a boom (11) is rotatably supported on a body (2) around a left-right axis, and an upper part of an arm (12) is supported on an upper side of the boom (11) by a support shaft (16) in a left-right direction. A) a pair of left and right support plates (23) are fixed to the upper part of the arm (12) so as to protrude upward, and a hydraulic cylinder (17) is provided between the left and right support plates (23). The boss (25a) at the tip of the cylinder rod (25) is rotatably supported around a pivot (24) in the left-right direction, and the cylinder body of the hydraulic cylinder (17) is pivoted around the boom (11). The arm (12) is configured to swing about the support shaft (16) with respect to the boom (11) by expansion and contraction of the hydraulic cylinder (17). ) To the arm (1
2) In the backhoe provided with the arm sensor (27) for detecting the swing angle, the arm sensor (27) is pivoted between the left and right support plates (23) of the boss (25a) of the cylinder rod (25). While being disposed on the attachment portion, and fixed to the support plate (23) side,
The arm sensor (27) detects the relative rotation angle of the boss (25a) of the cylinder rod (25) around the pivot (24) with respect to the support plate (23).
a) an interlocking mechanism (50) interlockingly connecting the arm sensor (27) to the left and right support plates (23), and the cover (4) covering the arm sensor (27) between the left and right support plates (23).
8), and a hydraulic hose (38) for a hydraulic cylinder (18) for operating the bucket (13) is inserted between the support plate (23) between the cover (48) and the arm (12). A backhoe arm angle detecting device.