JPH07373Y2 - Outrigger overhang position detector - Google Patents

Description

[Detailed Description of Device] a. The present invention relates to an outrigger device that is attached to a work vehicle such as an aerial work vehicle or a crane vehicle and supports a vehicle body during work. More specifically, the present invention relates to an outrigger device. The present invention relates to a detector that detects a protruding position of a constituent outrigger beam to the side of a vehicle body.

(Prior Art) As a work vehicle in which the above outrigger device is used, for example, as shown in FIG. Attach the telescopic boom 4 freely, and attach the workbench 7 to the end of the boom 4.
It is configured by attaching. Outrigger devices 50 are provided on the front, rear, left and right sides of the vehicle body 1, and the vehicle body 1 is supported by the outrigger devices 50 during work. Then, the boom 4 is lifted and retracted, and the turning motor 3 is turned so that the boom 4 is oriented in a desired direction, and the work table 7 is moved to a predetermined work position.

When performing work by performing such work control, so-called moment control has conventionally been performed to restrict the hoisting / extending / contracting operation of the boom 4 so that the fall direction moment acting on the vehicle body falls within a predetermined range. When performing this moment control, the magnitude of the allowable moment depends on the outrigger device.
It depends on the support position of the vehicle body 1 by 50.

An example of the outrigger device 50 is shown in FIG. 6A. An outrigger box 51 is fixed to the body frame so as to extend laterally, and an outrigger beam 52 is telescopically fitted into the box 51. A jack 55 is attached to the tip of the beam 52 so as to extend substantially vertically. . The jack 55 includes an outer post 56 fixed to the tip of the beam 52, an inner post 57 that is vertically inserted into the outer post 56, and a ground plate 58 joined to the lower end of the inner post 57. A jack cylinder that is installed in both posts 56 and 57 to raise and lower the inner post 57.
It consists of 59 and.

To support the vehicle body 1 by the outrigger device 50, the outrigger beam 52 is extended outward to position the jack 55 at a predetermined position, and then the jack cylinder 59 extends the inner post 57 downward to ground the ground plate 58. To do.
When the vehicle body is supported in this manner, the magnitude of the allowable overturning moment varies depending on the position of the vehicle body supported by the jack 55. Therefore, when performing the moment regulation, the position of the jack 55, that is, the outrigger beam extension position ( It is necessary to detect the amount), set an allowable moment corresponding to this position, and regulate the moment based on this allowable moment.

In order to detect this overhanging position, the conventional method has been used as the actual open sho 63-18417.
As disclosed in Japanese Patent Publication No.
The cam members (dogs) 53a, 53b having a predetermined thickness extending in the bulging direction are attached to the side surface 52a of the device as shown in FIG. 6A, and are attached to the side surfaces of the outrigger box 51 at positions corresponding to the cam members 53a, 53b. An overhang position detecting device provided with limit switches 54a and 54b has been used. Each limit switch 54a, 54b
The switch roller (not shown) of FIG. 2 is configured to come into contact with the side surface of the outrigger beam 52 through the opening of the outrigger box 51, similarly to the switch roller 21b shown in FIG. When the switch roller rides on the cam members 53a, 53b in response to this, the limit switches 54a, 54b are turned on and a "1" signal is output. It is designed to output.

The outputs of the two limit switches 54a and 54b corresponding to the protruding movement of the outrigger beam 52 are as shown in FIG. 6B. Therefore, by detecting the combination of the output signals (on / off signals) of the two limit switches 54a and 54b, the projecting position of the outrigger beam 52 can be detected, and appropriate moment regulation is performed based on this. It was

(Problems to be solved by the invention) However, short-circuit or disconnection of the wiring of the limit switch,
There is a problem that the detection of the overhang position becomes inaccurate when the limit switch is not properly operated due to falling off or freezing. For example, when the limit switch 54a is dropped or loosened, even if the outrigger beam 52 is extended from the fully retracted position to the intermediate 1 position, this switch
It is possible that 54a does not turn on and its output remains 0. In this case, the outrigger beam 52 is located at the intermediate 1 position, but the overhang position detector detects that it is in the fully retracted position. To do. For this reason, in such a case, the overhang position of the outrigger beam cannot be accurately detected, which leads to a problem that it is not possible to correctly perform Maumet's regulation.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a highly safe outrigger extension position detector capable of surely detecting a malfunction of a limit switch or the like when it occurs.

B. Configuration of the Invention (Means for Solving the Problem) In order to achieve such an object, in an overhang position detector according to the present invention, a plurality of cam members are provided in one of an outrigger box and an outrigger beam along an expansion / contraction direction. In addition to mounting it, a plurality of switches that are turned on and off by a cam member according to the expansion and contraction of the outrigger beam are installed on the other side, and whether the outrigger beam is projected to that position by the judgment device from the combination of on / off signals of these switches. It is decided to judge. Furthermore, when the outrigger beam is in the fully retracted position where it is completely retracted into the outrigger box and when the outrigger beam is in the position immediately preceding this fully retracted position, all switches are turned on.
When the cam members are set so that the off states are different, and when the outrigger beam is expanded and contracted between the fully retracted position and the immediately previous position, all of the switches are switched from on to off or from off to on at substantially the same time.

(Operation) When the outrigger position detector having the above configuration is used, when the outrigger beam stored at the fully retracted position is extended when the outrigger device is used, the outrigger beam passes from the fully retracted position to the immediately preceding position. It is projected to a predetermined position.
During the movement from the fully retracted position to the immediately preceding position, all of the plurality of switches are switched from on to off or from off to on almost immediately after the outrigger beam extending operation. If any of the switches is abnormal or malfunctions, the malfunctions can be detected easily and reliably because the on / off switching is not performed during the movement from the fully retracted position to the immediately preceding position.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

First, FIG. 5 shows an aerial work vehicle as an example of a work vehicle having an outrigger device. This aerial work vehicle has a swivel base 2 mounted on a vehicle body 1 so as to be rotatable, and a swivel mount of the swivel base 2. The tip boom 4b is telescopically inserted into a base boom 4a. The work device includes a boom 4 and a work bucket 7 attached to the tip of the telescopic boom 4. The swivel operation of the swivel base 2 is carried out by a hydraulic motor 3 for swiveling, the hoisting operation of the telescopic boom 4 is carried out by the telescopic operation of the hoisting cylinder 5, and the telescopic boom 4 is telescopically arranged in the telescopic boom 4. This is performed by the expansion and contraction operation of the cylinder 6.

Therefore, by operating the hydraulic motor 3, the hoisting cylinder 5, and the telescopic cylinder 6 based on the lever operation of the operator, the work bucket 7 can be moved to a desired position and work at a high place can be performed. A leveling device (not shown) is arranged between the work bucket 7 and the telescopic boom 4, and the work bucket 7 is always held horizontally during the work by the leveling device.

The above-mentioned work at a high place is performed by supporting the vehicle body 1 by means of the outrigger devices 10 arranged at the front, rear, left and right of the vehicle body 1. The outrigger device 10 will be described below with reference to FIG.

The basic structure of this outrigger device 10 is the same as the conventional structure shown in FIG. 6A, and an outrigger box 11 is fixed to the body frame so as to extend laterally, and an outrigger beam 12 is fitted in the box 11 so as to be expandable and contractible. The jack 15 is attached to the tip of the beam 12 so as to extend substantially vertically. The jack 15 includes an outer post 16 fixed to the tip of the beam 12, an inner post 17 that is vertically inserted into the outer post 16, and an inner post 17 that is vertically movable.
It is composed of a ground plate 18 joined to the lower end of 17 and a jack cylinder 19 arranged in both posts 16 and 17 for raising and lowering the inner post 17.

To support the vehicle body 1 by the outrigger device 10, the outrigger beam 12 is projected outward to position the jack 15 at a predetermined position, and then the jack cylinder 10 is used to extend the inner post 17 downward to ground the ground plate 18. To do.
When the vehicle body is thus supported, the magnitude of the allowable overturning moment varies depending on the position of the vehicle body supported by the jack 15, so that the present device 10 detects the outrigger beam 12 overhanging position (amount). An overhang position detector is provided.

This overhang position detector is provided on the side surface 12a of the outrigger beam 12.
Three rows of cam members that are attached to extend upward in the projecting direction
It has 31a, 32a, 32b and 33a, 33b, and three limit switches 21, 22, 23 attached to the side surface 11a of the outrigger box 11 corresponding to each row of these cam members. As shown in FIG. 2, the limit switches 21, 22, 23 are mounted on the side surface 11a of the outrigger box 11, and the switch arm 21a (22a, 23a) and the switch roller 21b (22b) mounted on the tip thereof. , 23b) protrudes inward from the side opening 11b of the outrigger box 11,
The switch rollers 21b (22b, 23b) are in contact with the side surface of the outrigger beam 12. These switch rollers 21b, 22b, 23
b is located corresponding to each row of the cam member, and when the switch roller rides on the cam member in response to the outrigger beam 12 overhanging, the limit switch is turned on to "1".
Output a signal. When the vehicle is not riding on the cam member, the limit switch is off and outputs a "0" signal.

The cam members 31a, 32a, 32b and 33a, 33b attached to the side surface 12a of the outrigger beam 12 and the limit switches 21, 22, 23 are schematically shown in FIG. FIG. 3 shows a state in which the outrigger beam 12 is located at the fully extended position where it is completely extended. In this state, the switch roller 22b of the limit switch 22 rides on the cam member 33b and the limit switch 22 Is on, but the other limit switches 21, 23 are off.

When the outrigger beam 12 is in the fully retracted fully retracted position, the switch rollers 21b, 22b, 23b are respectively set to "a".
"Located in the position shown in. More precisely," ₁ a ₁ indicated by "position moves the switch roller 21b, 22b, under 23b. Therefore, all rollers 21b, 22b, 23b, respectively cam members 31a, 32
Riding on a, 33a, all limit switches 21, 22, 23 are on and their outputs are all "1".

When the outrigger beam 12 is projected from this state, the switch rollers 21b, 22b, 23b are moved to the position "a ₂ " (position immediately before),
The position “a ₅ ” (full tension position) is reached through “a ₃ ” (intermediate position 1) and “a ₄ ” (intermediate position 2) in this order. FIG. 4 shows a combination of output signals of the limit switches 21, 22, 23 at each position when the outrigger beam 12 is projected in this way. As can be seen from this figure, by detecting the combination of the output signals of the limit switches 21, 22, 23, it is possible to know to what position the outrigger beam 12 has been projected.

Therefore, as shown in FIG. 3, each limit switch 2
The output signals of 1, 22 and 23 are input to the judging device 41, and the judging device 41 detects the projecting position of the outrigger beam 12 from the combination of these output signals. Then, the permissible moment corresponding to the detected overhang position is set, and the moment limiter 42 is actuated based on the permissible moment, and each actuator (the undulating cylinder 5, the telescopic cylinder 6, etc.) corresponding to the operation of the operation lever 43 by the controller 44. ) Operation control.

Here, the judging device 41 not only detects the protruding position of the outrigger beam 12 as described above, but also detects the limit switch 2
It also detects the malfunction of 1,22,23. This detection is performed by detecting whether or not all the limit switches 21, 22, 23 are switched from ON to OFF when the outrigger beam 12 moves from the fully contracted position to the immediately preceding position slightly overhanging. If there is a short circuit, disconnection, disconnection, freezing, etc. of the wiring of the limit switches 21, 22, 23, and one of these causes malfunction,
The switch that caused the malfunction is the outrigger beam.
Even if 12 moves from the fully retracted position to the immediately preceding position, it remains on or off and does not change. Therefore, by detecting the presence or absence of such a switch, the defective switch can be easily and reliably detected.

In particular, the immediately preceding position is set to a position where the outrigger beam slightly overhangs from the fully retracted position, and is located before reaching the actually used position (intermediate positions 1 and 2 or the fully tightened position).
If the limit switch has a malfunction, etc., before actually using the outrigger device, that is, immediately after performing the operation of extending the outrigger beam from the fully contracted state,
By detecting whether or not all the limit switches are switched from on to off almost at the same time, this can be surely detected, which is highly safe.

In the above, the limit switch is attached to the outrigger box and the cam member is attached to the outrigger beam, but conversely, the cam member is attached to the inner surface of the outrigger box and the limit switch is attached to the outrigger beam. good.

C. As described above, according to the present invention, when the outrigger beam moves between the fully retracted position and the immediately preceding position, all of the plurality of switches can be switched from on to off or from off to on. Since the cam member and each switch are arranged as described above, when the outrigger beam stored in the fully contracted state is extended when the outrigger device is used, the outrigger beam passes from the fully contracted position to the predetermined position through the immediately preceding position. All of the plurality of switches are turned on and off when moving from the fully retracted position to the immediately preceding position. Therefore, if any of the switches is abnormal or malfunctions, when moving from the fully retracted position to the immediately preceding position, that is, immediately after performing an operation of extending the outrigger beam from the fully retracted state, Since a defective switch is not turned on / off, this malfunction can be detected easily and reliably.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outrigger device having an overhang position detector according to the present invention, FIG. 2 is a sectional view of the above device taken along arrow II-II, and FIG. 3 is an overhang device according to the present invention. FIG. 4 is a schematic view showing the position detector, FIG. 4 is a table showing the relationship between the output of the limit switch and the overhang position in the overhang position detector, and FIG. 5 is a perspective view showing an aerial work vehicle equipped with an outrigger device. Fig. 6A is a perspective view showing an outrigger device having a conventional overhang position detector, and Fig. 6B is a table showing the relationship between the output of the limit switch and the overhang position in the conventional overhang position detector. is there. 1 …… Body 4 …… Boom 10 …… Outrigger device 11 …… Outrigger box 12 …… Outrigger beam 15 …… Jack, 18 …… Grounding board 21,22,23 …… Limit switch 31,32,33 …… Cam member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI technical display location B66F 11/04 E02F 9/08 A (72) Inventor Tomomasa Ehara 1152 Yamashita, Ryoke, Ageo City, Saitama Prefecture 10 Aichi Vehicle Co., Ltd. Ageo Plant (72) Creator Koichi Tsurumaki 10 Aichi Vehicle Co., Ltd. Ageo City, 1152 Ryoke Yamashita 1152 Aichi Vehicle Co., Ltd. Ageo Plant (72) Creator Akihiko Ohira Shinjimura, Tone-gun, Gunma Prefecture Higashimine Sugawa 414-1 Aichi Vehicle Co., Ltd. Shinji Plant (72) Creator Makoto Hamada Shinnemura, Tone-gun, Gunma Prefecture 41-1 Higashimine Sugawa Aichi Vehicle Co., Ltd. Shinji Plant (56) References JP, U)

Claims (1)

[Scope of utility model registration request] 1. An outrigger box fixed to a vehicle body,
The outrigger device is equipped with an outrigger beam that is extendably inserted into the outrigger box and can project to the side of the vehicle body, and a jack attached to the tip of this outrigger beam. The outrigger device detects the outrigger position of the outrigger beam. An outrigger bulge position detector, wherein a plurality of cam members attached to one of the outrigger box and the outrigger beam along the extension / contraction direction of the outrigger beam, and the other attached to the outrigger box and the outrigger beam From a plurality of switches that are turned on / off by each of the cam members according to expansion and contraction of the outrigger beam, and a determiner that determines the extended position of the outrigger beam based on a combination of on / off signals of these switches. Nari, the outrigger bee When the cam member is completely retracted into the outrigger box and when the cam member is at a position immediately preceding the fully contracted position so that the on / off state of the switch is different. When the outrigger beam is expanded and contracted between the fully retracted position and the immediately preceding position, all of the switches are switched from on to off or from off to on at substantially the same time. An outrigger extension position detection device characterized by: