JP3157971B2 - Work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine equipped with a kick-out device for automatically raising a lifting arm to a certain height, such as a wheel loader. The present invention relates to a work machine capable of mounting an inappropriate work attachment.

[0002]

2. Description of the Related Art As a working vehicle for loading earth and sand, for example, as shown in FIG. 7, an elevating arm 2 which is raised and lowered by a hydraulic cylinder (not shown) is mounted on a front surface of a traveling body 1 which can travel by wheels W. There is one equipped with a bucket 3 for loading earth and sand or the like at its tip. In such a wheel loader, in order to improve the operability when loading sediment such as earth and sand taken into the bucket 3 into a dump truck or throwing it into a hopper, the operation lever (not shown) of the lifting arm 2 is moved up to the raising position side. A kick-out device for fixing the operation lever in response to the operation of (1) and releasing the fixing of the operation lever to stop the elevating arm 2 when the elevating arm 2 reaches a predetermined height suitable for loading. I have.

[0003]

In the wheel loader described above, the bucket 3 is detached from the lifting arm 2 and a snow plow 4 as shown in FIG. 8 and an ice-cutting device 5 as shown in FIG. In some cases, snow removal on snowy roads and cutting and shaping of frozen road surfaces are performed (see Japanese Patent Application Laid-Open No. 4-350206). This type of work attachment is used at a position in contact with the road surface, and does not require a kickout device. Rather, when the kick-out device is used in an operable state, if the operation lever moves to the raising position side by the operator touching the operation lever of the elevating arm 2, the work attachment is moved to a predetermined height regardless of the operator's intention. Lifted, making usability worse. Moreover, in the ice slicing device 5 shown in FIG. 9, the protruding length from the lifting arm 2 is larger than that of the bucket 3 and the snow removal plow 4, so that when the lifting arm 2 rises to the set height of the kick-out device, the rotary type of the tip is rotated. There is a possibility that the height of the cutting body 5a becomes considerably high and comes into contact with various structures and houses on the road. In addition, since the rotary cutting body 5a is displaced above the pedestrian's view, the pedestrian may approach the rotary cutting body 5a overhead without noticing. Furthermore, since a heavy object such as a hydraulic motor for driving the rotary cutting 5a is mounted on the distal end side, when the lifting arm 2 rises to the set height of the kickout device, the position of the center of gravity of the entire working machine largely moves, and Stability is impaired.

[0004] It is an object of the present invention to provide a method for mounting a work attachment which is inappropriate for use of a kickout device.
An object of the present invention is to provide a working machine that can reliably prevent the kick-out device from operating.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 showing an embodiment and FIGS. 7 to 9 described above, the present invention provides a working machine body 1 having a lifting arm 2 and a lifting arm 2. A kick-out device K that continues to raise the elevating arm 2 until it reaches a predetermined position after starting to ascend, and a plurality of work attachments that can be selectively attached to the elevating arm 2. First work attachment 5 for which use of kickout device K is inappropriate
The present invention is applied to a working machine in which connector members 17 and 20 for connecting electric circuits mounted on both the working machine body 1 and the first working attachment 5 are provided. A part of the kickout electric circuit for operating the kickout device K is guided to the connector member 17 on the work implement body 1 side, and the electric circuit C1 on the first work attachment 5 side is connected to the work implement body 1 side. Connector member 17 on the work machine body 1 side when connected to the electric circuit of FIG.
The above-described object is achieved by configuring the kick-out electric circuit guided to the above to be held in a cut-off state. According to the second aspect of the present invention, the work implement main body 1 is provided with the main body side protective cap 32 that can be connected to the kickout electric circuit that is connected to the connector member 17 of the work implement main body 1 and guided to the connector member 17. . According to the third aspect of the present invention, as shown in FIG. 4, the main body side protective cap 32 is attached to the support line 30 branched from the wiring 18 drawn into the connector member 17 on the work machine main body 1 side. According to the invention of claim 4, as shown in FIGS. 4 and 5, the body-side protection cap 32 and the attachment-side protection cap 33 that can be fitted with the connector member 20 on the first work attachment side are connected to the first work attachment. 2 drawn into the connector member 20 on the side
It was attached to a support line 31 branched from 1.

[0006]

The electric circuit C1 on the first work attachment 5 side and the electric circuit on the work machine body 1 side are connected to the connector members 17 and 20 so that the first work attachment 5 mounted on the lifting arm 2 can be normally operated. When the connection is made, the kickout electric circuit is cut off. When the user wants to use the kickout device K when attaching a work attachment different from the first work attachment 5, the kickout electric circuit guided to the connector member 17 on the work implement body 1 side is connected. According to the second aspect of the present invention, when the first work attachment 5 is detached and the connector member 17 of the work machine main body 1 is connected to the main body side protection cap 32, the kickout electric circuit is connected and the kickout device K is connected. It is ready for operation. At this time, the connector member 17 on the work implement body 1 side is used.
Is closed by the body-side protective cap 32 to prevent the internal terminals from being exposed. According to the third aspect of the present invention, the body-side protective cap 32 removed from the connector member 17 on the working machine body side is restrained by the support wire 30 in the vicinity of the connector member 17. According to the invention of claim 4, when the first work attachment 5 is mounted, the main body side protection cap 32 and the attachment side protection cap 33 are fitted to connect the kickout electric circuit provided on the main body side protection cap 32. Prevent exposure of terminals. When the first work attachment 5 is removed, the open end of the connector member 17 of the first work attachment 5 is closed with the attachment-side protection cap 33 to prevent the internal terminals of the connector member 20 from being exposed.

In the means and means for solving the above problems which explain the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0008]

【Example】

-First Embodiment- Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the electric circuit of the wheel loader shown in FIGS. 7 to 9 is improved, and the same parts as those in FIGS.

FIG. 1 shows a part of an electric circuit for operating a kick-out device K mounted on the working machine body side of the wheel loader of the present embodiment, and an electric circuit C1 mounted on an ice-breaking device 5 shown in FIG. And a part of. In the figure, 10 is a power supply, 11 is a power supply fuse, 12 is a proximity switch for detecting the height of the lifting arm 2, and 13 is a detent coil for fixing an operation lever (not shown) for operating the lifting arm 2. In the kickout device K of this embodiment, when the operation lever of the lifting arm 2 is operated to the arm raising position, the detent coil 13 is excited to fix the operation lever to the raising position. Then, the proximity switch 12 detects that the lifting arm 2 has been raised to a position suitable for a loading operation or the like, and at this time, the excitation of the detent coil 13 is released to release the fixing of the operation lever.

The proximity switch 12 is interposed between the detection terminal 12b and the ground terminal 12c when the detection body 14 is within a predetermined distance from the detection surface f in a state where power is supplied from the power supply terminal 12a. The internal contact (not shown) is closed. FIGS. 2 and 3 show how the proximity switch 12 and the detector 14 are mounted. The detection body 14 is formed in a fan shape, and is bolted in the vicinity of the fulcrum of attachment of the lifting arm 2 to the front frame 1a (see FIG. 7) of the traveling body 1 with its circumferential direction coinciding with the swinging direction of the lifting frame 2. Fixed. The direction of arrow U in FIG.
, The arrow D direction corresponds to the descending direction of the lifting arm 2. On the other hand, the proximity switch 12 attaches its detection surface f to the detection object 14 on a bracket 16 fixed to the front frame 1a.
It is mounted facing the side surface of. FIG. 2 shows the position where the lifting arm 2 is lowered to the lowest position. When the lifting arm 2 is positioned below, the detection body 14 is positioned in front of the detection surface f of the proximity switch 12 and the internal contact of the proximity switch 12 is closed. When the elevating arm 2 rises so that the detection body 14 is displaced from the front of the detection surface f of the proximity switch 12, the internal contact of the proximity switch 12 is opened.

As shown in FIG. 1, a ground terminal 12c of the proximity switch 12 is grounded, and a power terminal 12a is
In addition, the detection terminal 12b is guided to the wiring connector 17. The ground circuit of the detent coil 13 is also led to the wiring connector 17. The wiring connector 17 is attached to the traveling body 1 and can be connected to the wiring connector 20 of the electric circuit C1 mounted on the ice slicing device 5 described above. The electric circuit C1 includes a vehicle width light 21 and a rotary cutting body 5a.
Various devices and sensors, such as a rotation sensor 23 for detecting the rotation of the rotating body 22 which rotates integrally with the rotating body 22 (see FIG. 9), are mounted. Connected. Wiring connector 17,2
In the coupled state of 0, the space between the detent coil 13 and the detection terminal 12b of the proximity switch 12 is kept in the cutoff state.

FIG. 4 shows the connection state of the wiring connectors 17 and 20 described above. Reference numeral 18 denotes a wiring cable drawn from the electric circuit of the traveling body 1 to the wiring connector 17, and reference numeral 21 denotes an electric circuit C 1 of the ice-breaking device 5. This is a wiring cable drawn into the wiring connector 20 from FIG. Support wires 30 and 31 are branched from the distribution cables 18 and 21, respectively, and protective caps 32 and 3 are provided at ends of the support wires 30 and 31, respectively.
3 are attached. These protective caps 32, 33
Are provided so as to be fitted to each other. As shown in FIG. 5, the protective cap 32 is fitted to the wiring connector 17 and the protective cap 33 is fitted to the wiring connector 20 so that the open ends of the wiring connectors 17 and 20 can be sealed. As shown in FIG. 1, the protective cap 32 on the traveling body 1 side includes:
When coupled with the wiring connector 17, the detent coil 13
A jumper circuit 34 for connecting the detection switch 12 and the detection terminal 12b of the proximity switch 12 is additionally provided. The support wire 30 may be used for the jumper circuit 34. It should be noted that the protective cap 33 on the side of the ice removing device 5 has no terminal, and the support wire 31 merely restrains the dummy connector 33. The wiring connectors 17 and 20 and the protective caps 32 and 33 use high waterproofness.

According to the above construction, the ice-breaking device 5 is mounted on the elevating arm 2 and the wiring connectors 17 and 17, as shown in FIG.
1, the detent coil 13 and the detection terminal 12b of the proximity switch 12 are disconnected, and the ground circuit of the detent coil 13 is prevented from being grounded. Therefore, the detent coil 13 is kept in the non-excited state, and the kickout device K does not operate. If the protective caps 32 and 33 are fitted at this time, the terminals in the protective cap 32 are prevented from being exposed, and short-circuiting due to corrosion or water intrusion can be prevented.

When the bucket 3 is mounted with the ice removing device 5 removed, the protective cap 32 is fitted to the wiring connector 17 as shown in FIG. This makes the detent coil 1
3 is connected to the detection terminal 12b of the proximity switch 12 via a jumper circuit 34, and the proximity switch 12
The energization and non-excitation of the detent coil 13 are switched in accordance with the on / off state of the kickout device K, and the kickout device K becomes operable. At this time, as shown in FIG. 5, the wiring connector 20 of the ice removing device 5 is fitted with the protective cap 33 to prevent the terminals in the wiring connector 20 from being exposed, thereby preventing corrosion during storage.

In this embodiment, the protective caps 32, 33 removed from the wiring connectors 17, 20 are connected to the support wires 30, 31.
As a result, the protective caps 32 and 33 are not lost.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 6, in the present embodiment, the ground circuit of the detent coil 13 and the detection terminal 12b of the proximity switch 12 are connected and disconnected according to the opening and closing of the relay contact 41a of the relay 41. The relay 41 is a normally open type in which the relay contact 41a is closed by excitation of the relay coil 41b, and the earth circuit of the relay coil 41b is guided to the wiring connector 17A. The wiring connector 20A of the ice removing device 5 is configured to prevent grounding of the relay coil 41b when coupled to the wiring connector 17A. A protective cap 32A on the side of the traveling body 1 that can be connected to the wiring connector 17A has a grounding circuit 42 that grounds the relay coil 41b when connected to the wiring connector 17A.
Is attached. The wiring connectors 17A, 20A
The support structure of the protection cap 32A is the same as the wiring connectors 17 and 20 and the protection cap 32 of the first embodiment, and the support wire 30 may be used for the ground circuit 42 of the protection cap 32A. Protective cap 3 on ice-breaking device 5 side
3 is the same as in the first embodiment.

In this embodiment, when the wiring connectors 17A and 20A are connected at the time of mounting the ice slicing device 5, the excitation of the relay coil 41b is prevented, the relay contact 41a is opened, and the detent coil 13 is held in a non-excited state. You. When the wiring connector 20A is removed and the protection cap 32A is attached, the relay coil 41b is excited to close the relay contact 41a, and the excitation and non-excitation of the detent coil 13 is switched according to the ON / OFF of the proximity switch 12. The kickout device K becomes operable. In this embodiment, since the number of poles of the wiring connector 17A is smaller than that of the first embodiment, the connector can be downsized.

In the above embodiment, a wheel loader to which the bucket 3 and the ice-breaking device 5 can be mounted has been described as an example. However, the present invention is not limited to this, and a work attachment using a kick-out device, a kick-out device, The present invention can be applied to any work machine in which a work attachment inappropriate for use of the device is selectively mounted. In the case where the work attachment using the kickout device is also provided with an electric circuit and a connector member, the kickout electric device is connected when the connector member on the work attachment side is connected to the connector member on the work implement body. What is necessary is just to comprise so that a circuit may be connected.

In the above embodiment, the traveling body 1 is the work implement body, the bucket B, the snow removal plow 4, the ice removing device 5 is the work attachment, the ice removing device 5 is the first work attachment, and the wiring connector 17 is the wiring connector 17. The work machine body side connector member, the wiring connectors 20 and 20A constitute the first work attachment side connector member, the protection caps 32 and 32A constitute the body side protection cap, and the protection cap 33 constitutes the attachment side protection cap. .

[0020]

As described above, according to the present invention,
When the electric circuit on the first work attachment side and the electric circuit on the work machine main body side are connected by coupling a connector member in order to normally operate the first work attachment mounted on the lifting arm, the electric circuit for kickout is cut off. Therefore, the kick-out device does not operate at the time of work using the first work attachment where the use of the kick-out device is inappropriate, and the lifting arm may be lifted up against the intention of the operator, causing various inconveniences. There is no. According to the invention of claim 2, the kick-out device can be used only by connecting the connector member on the working machine body side and the protective cap on the body side, and at the same time, at the opening end of the connector member on the working machine body side. A short circuit due to corrosion or ingress of exposed terminals or the like is prevented. According to the third aspect of the present invention, the body-side protective cap removed from the connector member on the working machine main body is restrained by the support wire near the connector member on the working machine main body, thereby preventing its loss. In the invention of claim 4,
It is possible to prevent the internal terminals from being exposed by fitting the body-side protection cap or the wiring connector on the first work attachment side removed from the connector member on the work machine body side to the attachment-side protection cap. The support wire branched from the wiring to the connector member on the first work attachment side restricts the attachment side protection cap near the connector member of the first work attachment, thereby preventing its loss.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of a first embodiment of the present invention.

FIG. 2 is a diagram showing an arrangement of a proximity switch for detecting a height of a lifting arm in the first embodiment.

FIG. 3 is a view as seen from the direction of arrow III in FIG. 2;

FIG. 4 is a diagram showing a connection state of the wiring connectors 17 and 20 of FIG. 1;

FIG. 5 is a diagram showing a state in which the wiring connectors 17 and 20 of FIG. 1 have been removed.

FIG. 6 is an electric circuit diagram of a second embodiment of the present invention.

FIG. 7 is a diagram illustrating an example of a wheel loader.

FIG. 8 is a diagram showing a state in which a snow plow is mounted on a wheel loader.

FIG. 9 is a diagram showing a state in which an ice-breaking device is mounted on the wheel loader.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Elevating arm 3 Bucket 5 Icebreaker 12 Proximity switch 13 Detent coil for kickout 17 Wiring connector on running body 18 Wiring to wiring connector on running body side 20, 20A Wiring connector on icebreaker 21 Cutting Lead-in wiring to wiring connector on ice machine side 30, 31 Support wire 32, 32A Protective cap on traveling body side 33 Protective cap on ice-breaker side

Claims (4)

(57) [Claims] 1. A work machine main body having a lifting arm, a kick-out device for continuing the lifting of the lifting arm until the lifting arm reaches a predetermined position after the lifting arm starts to lift, and selectively provided to the lifting arm. A plurality of work attachments that can be mounted, wherein the plurality of work attachments includes a first work attachment for which use of the kickout device is inappropriate, and the work implement body and the first work attachment include In a working machine provided with a connector member for connecting an electric circuit mounted on both of them, a part of the kickout electric circuit for operating the kickout device is extended to a connector member on the working machine body side. Leading and connecting the electric circuit on the first work attachment side to the electric circuit on the work machine main body side. Working machine, characterized in that the working machine body side of the connector member to the guided the kickout electric circuit is configured to be retained in the blocked state. 2. The work machine main body is provided with a main body side protection cap which can be connected to the kickout electric circuit guided to the connector member by being connected to the connector member on the work machine main body side. The working machine according to claim 1, wherein 3. The working machine according to claim 2, wherein the body-side protective cap is attached to a support line branched from a wiring drawn into a connector member of the working machine body. 4. The body-side protection cap and the first protection cap.
The attachment-side protection cap that can be fitted with the connector member on the work attachment side is attached to a support line branched from wiring drawn into the connector member on the first work attachment side. Work machine.