JPH11269942A - Boom angle detection device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boom angle detection device having a simple constitution which eliminates a fear that a driver's seat provided on a machine base is contracted or interferes with various equipment arranged on the outer peripheries of a pair of opposite wall parts. SOLUTION: A working machine has a boom whose rear end is pivotally supported between a pair of opposite wall parts 53 in such a way as to freely swing about a pivot, and has a boom cylinder 25 pivotally supported at its upper part to the boom and pivotally support at its lower part to a mounting bracket 54 located between the opposite wall parts 53, the expansion and contraction of the boom cylinder 25 causing the boom to swing about the pivot. A mounting hole 61 is provided in one of the pair of opposite wall parts 53, and a boom angle sensor 62 for detecting the angle of the swing of the boom cylinder 25 is provided in the mounting hole 61 in such a way as to project between the one opposite wall part 53 and the mounting bracket 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for detecting a boom angle of a working machine.

[0002]

2. Description of the Related Art In general, a working machine for an earth-moving construction machine supports a machine (turning table) provided with a driving section on a traveling device, and pivots a lower portion of a boom on the machine, and an upper portion of the boom. The upper part of the arm is pivotally supported, and the lower part of the arm is provided with a bucket, and the boom, the arm, and the bucket are swingably operated by hydraulic cylinders.

Further, the boom includes a first boom member supported on the machine base, a second boom member connected to the first boom member so as to swing left and right, and a boom connected to the second boom member so as to swing left and right. With one end of the linkage link attached to the mounting bracket protruding from the first boom member.
The other end of the connecting link is pivotally supported on the support bracket side while being pivotally supported around the support shaft, and the link is linked in parallel with the first boom member, the second boom member, and the support bracket. A link is configured to swing the second boom member with respect to the first boom member so that the arm is translated (offset) in the left-right direction.

[0004] Some of these working machines are provided with an interference preventing device so that the bucket does not interfere with the driving section or the sunshade, cabin or the like covering the driving section. This interference prevention device includes a swing angle of the boom with respect to the swivel, a swing angle of the arm with respect to the boom, a swing angle of the bucket with respect to the arm, and an offset of the arm and the bucket (parallel movement).
Equipped with angle sensors that detect the position, the angle sensor detects the position of the bucket, and forcibly returns the control valve of the hydraulic cylinder to the neutral position when the bucket tries to enter the interference area with the driver's seat etc. Then, the boom, arm and bucket are stopped.

[0005] A pair of left and right opposing walls are provided on the machine base, and a mounting bracket is provided between the pair of left and right opposing walls, and a base end of the boom is supported between the pair of left and right opposing walls. The upper end of the boom cylinder is pivotally supported by the boom, the lower end of the boom cylinder is pivotally supported by the mounting bracket, and the boom is swung about the support shaft by expansion and contraction of the boom. An angle sensor for detecting the swing angle of the boom with respect to the machine base is attached to one of the outer surfaces of the pair of left and right opposed walls, and the rotation input unit of the angle sensor is attached to the outer end of the angle sensor. A connecting member that is disposed so as to coincide with the support shaft of the base end of the boom and that connects the rotation input unit of the angle sensor and the boom is provided so as to straddle the inside and outside between the opposing walls (for example, 7-33067
2).

[0006]

Therefore, in the above-described conventional apparatus, the angle sensor for detecting the swing angle of the boom is provided between a pair of left and right opposing walls supporting the base end of the boom. Since the entire angle sensor projects greatly outward, the angle sensor for detecting the boom swing angle can be used to narrow the driver's seat provided on the machine base, or to be placed on the outer periphery of a pair of left and right opposed walls. There is a problem of interference with various devices.

Further, a connecting member for connecting the rotation input portion of the angle sensor and the boom also narrows the driver's seat provided on the machine base and interferes with devices arranged on the outer periphery of the pair of left and right opposed walls. There was a problem. Accordingly, the present invention has been made in view of the above problems, and has a simple configuration in which the driver's seat provided on the machine base is narrowed or does not interfere with various devices arranged on the outer periphery of the pair of opposed walls. It is an object to provide a boom angle detection device.

[0008]

The technical means of the present invention for solving this technical problem is that a base 13 is provided with a pair of opposing walls 53, and between the pair of opposing walls 53. A mounting bracket 54 is provided, and the base end of the boom 22 is pivotally supported between a pair of left and right opposing wall portions 53 so as to swing around a support shaft 35, and the upper side of the boom cylinder 25 is pivotally supported by the boom 22. The lower side of the boom cylinder 25 is pivotally supported by the mounting bracket 54, and the boom cylinder 25
In the working machine in which the boom 22 is swung around the support shaft 35 by expansion and contraction, a mounting hole 61 is provided in one of the pair of opposing wall portions 53, and the mounting hole 61 is provided in the one opposing wall portion. The point is that a boom angle sensor 62 for detecting the swing angle of the boom cylinder 25 is provided so as to protrude between the mounting bracket 53 and the mounting bracket 54.

Therefore, unlike the conventional case, the entire angle sensor does not greatly protrude outward from between the opposing walls, and the amount of protrusion between the opposing walls 53 of the boom angle sensor 62 can be minimized. Thus, the boom angle sensor 62 can effectively prevent the driver's seat provided on the machine base 13 from being narrowed or from interfering with various devices disposed on the outer periphery of the pair of left and right opposed walls.

The technical means of the present invention includes a pivot shaft 56 at the lower end of the boom cylinder 25 and a boom angle sensor 62.
The boom angle sensor 62 is attached to the one opposing wall 53 so that the rotation axis of the rotation input unit 63 coincides with the rotation axis. Therefore, the swing angle of the boom cylinder 25 around the pivot shaft 56 can be reliably detected by the boom angle sensor 62, and the swing angle of the boom cylinder 25 around the pivot shaft 56 is detected, whereby the boom 2 with respect to the machine base 13 is detected.
2 can be detected.

The technical means of the present invention includes a boom cylinder 25 and a rotation input section 63 of the boom angle sensor 62.
And the connecting member 65 for connecting the one opposing wall 53
And the mounting bracket 54. Accordingly, it is possible to prevent the connecting member 65 from narrowing the driver's seat provided on the machine base 13 and prevent the connecting member 65 from interfering with various devices arranged on the outer periphery of the pair of left and right opposed walls. Further, it is not necessary to provide the connecting member so as to straddle the inside and the outside between the opposed wall portions as in the related art.
Of the boom cylinder 25 and the boom angle sensor 62 can be simpler.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Excavator 10 shown in FIGS.
Is a traveling body 1 having a rubber crawler traveling track 11
2 and a machine base (turntable) 13 above the traveling body 12.
Are supported so as to be able to rotate. On the upper left side of the machine base 13, an operating unit 16 including a driver's seat 14 and an operation lever 15 is provided, and on the right side of the machine base 13, a backhoe device 17 is mounted.

A pair of front and rear columns 18 are erected at the left and right centers of the machine base 13.
The canopy 19 which covers the upper part of the vehicle is attached. Also,
A dozer device 21 is mounted on a front portion of the traveling body 12. A weight 33 is provided at the rear of the machine base 13 to maintain the balance of the front and rear weights with the backhoe device 17, and a hood 34 is provided from the right side of the machine base 13 and above the weight 33.

The backhoe device 17 comprises a boom 22 supported on the machine base 13 via a boom support shaft 35 in the left-right direction so as to be able to swing up and down, and a tip end of the boom 22 swingably around the left-right shaft 20. An arm 23 is connected, and a bucket 24 is connected to a tip end of the arm 23 so as to be swingable around a left-right axis 21. The boom 22 is vertically swung by a boom cylinder 25 interposed between the machine base 13 and the boom 22, and the arm 23 is connected to the boom 22 and the arm 23.
Is pivotally driven back and forth by an arm cylinder 26 interposed between the arm 23 and the bucket 24.
And driven by a bucket cylinder 27 interposed therebetween.

The boom 22 includes a first boom supported by the machine base 13.
A boom member 28, a second boom member 29 connected to the distal end of the first boom member 28 so as to be able to swing left and right around a support shaft 37, and a distal end of the second boom member 29 around a support shaft 38. Support bracket 3 connected to swing left and right
The support bracket 30 is connected to the base end of the arm 23.

A link 31 is attached between the vicinity of the distal end of the first boom member 28 and the support bracket 30. One end of the link 31 is pivotally supported by a pair of upper and lower mounting brackets 41 projecting from the first boom member 28 so as to be swingable about a support shaft 42, and the other end of the link 31 is connected to a support bracket. 30 is pivotally supported by a pair of upper and lower mounting brackets 43 protrudingly provided around the support shaft 44 so that the link 31 and the first boom member 2
8, the second boom member 29 and the support bracket 30 form a parallel quadruple link, and the offset cylinder 3
2, the arm 23 is moved in the left and right direction (offset) by swinging the second boom member 29 left and right with respect to the first boom member 28.

As shown in FIGS. 6 and 7, a U-shaped holding member 39 is provided on the upper surface (rear surface) of the boom 22.
7, a pipe (not shown) for supplying hydraulic oil to the arm cylinder 26 and the like is inserted and held.
And is arranged along the upper surface (rear surface) of the boom 22.

Each mounting bracket 41 is connected to the first boom member 2.
8, the mounting bracket 41 is located at a position lower than the upper surface 28a of the upper end of the first boom member 28. As shown in FIGS. 6 and 7, a link angle sensor 46 for detecting the swing angle of the link 31 is provided on the upper surface of the upper mounting bracket 41.
Of the upper end of the first boom member 28
a. The link angle sensor 46 has a fixed part 50 and a rotation input part 47, the fixed part 50 is fixed to the mounting bracket 41, and the rotation input part 47 is fixed to the fixed part 50.
Is held rotatably about a rotation axis coinciding with the support shaft 42.

A connecting piece 48 protrudes from the rotation input portion 47 of the link angle sensor 46, and an engaging piece 49 protruding from the link 31 is engaged with the connecting piece 48 via an engaging pin 51. The rotation input unit 47 of the link angle sensor 46 interlocks with the swing of the support shaft
It turns around two. The link angle sensor 46 includes a potentiometer, and the input shaft of the potentiometer rotates integrally with the rotation input unit 47, whereby the resistance value of the potentiometer of the link angle sensor 46 changes, and the fixing unit 50 of the link angle sensor 46 The rotation input unit 47 is configured to detect the swing angle of the link 31 based on the rotation angle of the rotation input unit 47 about the support shaft 42.

The arm cylinder 26 is interposed between the support bracket 30 and the arm 23. The boom support shaft 35 is provided between a pair of left and right opposed wall portions 53 provided on the machine base 13. 4 and 5
As shown in FIG.
Are provided, and a pair of left and right mounting brackets 54 are provided between the pair of opposed wall portions 53, and the pair of left and right opposed wall portions 53 are provided with boss portions 55, respectively. By inserting the boom support shaft 35 through the insertion hole formed at the base end of the boom 22, the boom support shaft 35 is detachably attached to the machine base 13, and the base end of the boom 22 is provided between the opposing wall portions 53. The portion is pivotally supported around a boom support shaft 35 so as to be swingable.

The upper side of the boom cylinder 25 is the boom 22
, And the lower side of the boom cylinder 25 is pivotally supported by a pair of left and right mounting brackets 54 so as to be swingable about a pivot shaft 56, and the boom 22 is swung about a boom support shaft 35 by expansion and contraction of the boom 22. It has become. As shown in FIGS. 4 and 5, a mounting hole 61 is provided in one of the pair of opposed wall portions 53, and a boom angle sensor 62 for detecting the swing angle of the boom cylinder 25 is provided in the mounting hole 61. , The boom angle sensor 62 has a fixed portion 66 and a rotation input portion 63, and the fixed portion 66 is fixedly fitted in the mounting hole 61 of one of the opposed wall portions 53, and the rotation input portion 63 is fixed to the fixed portion 66.
Is held rotatably about a rotation axis coinciding with the pivot shaft 56 with respect to the one of the opposed wall portions 53 and the mounting bracket 5.
4 and protrude.

A connecting member 65 for connecting the boom cylinder 25 and the rotation input section 63 of the boom angle sensor 62 includes:
It is arranged between the one opposing wall 53 and the mounting bracket 54. The connecting member 65 is connected to the boom angle sensor 6.
2 has a connecting piece 67 fixedly fitted in the rotation input portion 63 and an engaging piece 68 protruding from the boom cylinder 25. The engaging piece 68 is engaged with the connecting piece 67, and The rotation input section 63 rotates around the pivot shaft 56 in conjunction with the swing around the pivot shaft 56.

The boom angle sensor 62 has a potentiometer, and the input shaft of the potentiometer rotates integrally with the rotation input section 63 around the pivot shaft 56, whereby the resistance value of the potentiometer of the boom angle sensor 62 is reduced. The swing angle of the boom cylinder 25 about the pivot shaft 56 is detected based on the angle at which the rotation input unit 63 rotates about the pivot shaft 56 with respect to the fixed portion 66 of the boom angle sensor 62. It is configured.

[0024]

According to the present invention, the driver's seat provided on the machine base 13 may be narrowed by the boom angle detecting device, or the boom angle detecting device may interfere with various devices disposed on the outer periphery of the pair of opposed wall portions 53. Disappears.

[Brief description of the drawings]

FIG. 1 is a plan view of a working machine showing an embodiment of the present invention.

FIG. 2 is a side view of the work machine.

FIG. 3 is a front view of the work machine.

FIG. 4 is a front sectional view of the boom angle sensor.

FIG. 5 is a side sectional view of the boom angle sensor.

FIG. 6 is a plan view of the link angle sensor.

FIG. 7 is a side sectional view of the link angle sensor.

[Explanation of symbols]

 13 Machine base 22 Boom 25 Boom cylinder 35 Boom support shaft 53 Opposite wall 54 Mounting bracket 56 Pivot support 61 Mounting hole 62 Boom angle sensor 63 Rotation input unit 65 Connecting member

Claims (3)

[Claims] 1. A pair of opposed wall portions (53) on a machine base (13).
And a mounting bracket (54) located between the pair of opposing walls (53) is provided. The base end of the boom (22) is supported between the pair of left and right opposing walls (53) by a support shaft ( 35) It is pivotally supported around it, and the upper side of the boom cylinder (25) is pivotally supported by the boom (22), and the lower side of the boom cylinder (25) is connected to the mounting bracket (5).
4) A work machine pivotally supported by 4) and configured to swing the boom (22) around a support shaft (35) by expansion and contraction of a boom cylinder (25), wherein the work machine is attached to one of the pair of opposed wall portions (53). A hole (61) is provided, and the swing angle of the boom cylinder (25) is set in the mounting hole (61) so as to protrude between the one opposing wall (53) and the mounting bracket (54). A boom angle detection device for a working machine, comprising a boom angle sensor (62) for detecting. 2. A boom angle sensor (62) such that a pivot shaft (56) on a lower end side of a boom cylinder (25) coincides with a rotation axis of a rotation input section (63) of a boom angle sensor (62). The boom angle detecting device for a working machine according to claim 1, wherein the first and second opposed walls (53) are attached to the first and second opposed walls (53). 3. A connecting member (65) for connecting a boom cylinder (25) and a rotation input portion (63) of the boom angle sensor (62) includes the one opposing wall portion (53) and a mounting bracket (53). The boom angle detection device for a working machine according to claim 1 or 2, wherein the device is disposed between the boom angle detection device and the boom angle detection device.