JPH0618204A - Boom operation detector for industrial vehicle - Google Patents

Abstract

PURPOSE:To facilitate installation and wiring of a boom operation detector by providing a boom operation detector integrated compactly with a detector for detecting telescopic position and hoisting position of boom. CONSTITUTION:Upon telescopic driving of a boom B, reel body 3 of a boom operation detector 1 is rotated through rewinding function of a cord C produced through feed-out of the cord C or the resiliency of a power spring 5. Consequently, an output shaft 4 rotates to cause rotation of a potentiometer 12 through a reduction gear 10, and gears 13a, 13b. As a result, a detection signal corresponding to the telescopic position of the potentiometer 12 is outputted from the potentiometer 12. Upon hoist driving of the boom B, a resistor in the potentiometer 17 inclines depending on the hoisting state, but since a weight 17b shows the vertical direction at all times, a signal corresponding to the hoist angle of the boom B is outputted from the potentiometer 17. This constitution facilitates fixing work of boom operation detector.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic position of a boom mounted on an industrial vehicle such as a lifter crane or an aerial work vehicle, and a telescopic position detected by detecting an undulation angle. The present invention relates to a boom motion detection device for an industrial vehicle that outputs an electric signal corresponding to the undulation angle.

[0002]

2. Description of the Related Art Conventionally, a boom mounted on an industrial vehicle such as a lifter crane or an aerial work vehicle is generally expanded and contracted by driving a telescopic cylinder and is undulated by driving a lift cylinder. Is configured. Then, in order to detect the expansion / contraction position of the boom, a potentiometer for the telescopic cylinder which detects expansion / contraction of the telescopic cylinder and outputs a detection signal thereof is arranged near the telescopic cylinder, while A lift cylinder potentiometer is provided near the lift cylinder to detect the expansion and contraction of the lift cylinder and calculate the undulation angle of the boom based on the expansion / contraction position.

[0003]

According to the above conventional boom motion detecting means, the potentiometer for detecting the expansion / contraction position of the boom is provided beside the telescopic cylinder and the hoisting angle of the boom. Are arranged near the lift cylinders and wired so that the detection signals output from the respective potentiometers are input to the boom control circuit. Therefore, it is necessary to separately attach the attachment members for attaching the respective potentiometers to the side of the telescopic cylinder and the side of the lift cylinder. Furthermore, since the wiring routes are different, a plurality of cables can be installed. Since it is necessary, there is a problem that the assembly and wiring work is troublesome.

Therefore, in the present invention, it is a technical subject to solve the above-mentioned conventional problems by integrating the means for detecting the expansion / contraction position of the boom and the means for detecting the undulation angle of the boom. It is what

[0005]

The technical means for solving the above-mentioned problems is to install a boom motion detection device for an industrial vehicle, in which the boom that is installed in the industrial vehicle and is expanded and contracted and undulated is expanded and contracted. At this time, a rotation conversion unit which converts the expansion / contraction operation into a rotation operation and outputs the rotation operation, and an expansion / contraction position detection signal of the boom corresponding to the electric resistance value when the rotation conversion unit is rotated with the rotation are output. Each of the expansion / contraction position detection body and the undulation angle detection body which is operated in accordance with the undulation movement of the boom and which outputs the undulation angle detection signal corresponding to the undulation angle associated with the undulation movement are provided in one case. It is to be arranged.

[0006]

According to the boom motion detecting device for an industrial vehicle having the above-described structure, when the boom is expanded or contracted, the rotation conversion unit converts the expansion or contraction motion into the rotation motion, so that the expansion / contraction distance detecting member converts the rotation conversion. The unit outputs a boom expansion / contraction position detection signal corresponding to an electric resistance value when the rotation conversion unit rotates the rotation conversion unit. Therefore, when the boom control circuit receives the expansion / contraction position detection signal, the expansion / contraction position of the boom can be recognized in real time. On the other hand, when the boom is undulating, and the undulation angle of the boom changes with the undulation, the undulation angle detector outputs an undulation angle detection signal. When the angle detection signal is input, the undulation angle of the boom can be recognized in real time.

[0007]

An embodiment of the present invention will now be described with reference to the drawings. FIG. 1 is a side view schematically showing the overall structure of the Rafter Crane A. As shown in FIG. 1, the rafter crane A is equipped with a boom B serving as a hanging arm of the rafter crane A. This boom B
Is expanded and contracted by a hydraulic cylinder for expansion and contraction drive (not shown) and is also expanded and contracted by a hydraulic cylinder for ups and downs drive. A wire D is hooked on the tip of the boom B, and a hook G on which the rope F of the baggage E is hooked is connected to the tip of the wire D. When the boom B is driven to expand and contract and rise and fall, the driver operates an operating tool (not shown) provided in the cab H.

Further, as shown in FIG.
A boom motion detection device 1 for detecting the expansion / contraction position of the boom B and the undulation angle is attached. The boom motion detecting device 1 is configured as a disk-shaped cord reel type, and the tip end of the code C fed from the boom motion detecting device 1 is at the tip end of the boom B. It is connected. Therefore, when the boom B is operated in the extension direction, the code C is fed out from the boom motion detecting device 1, while when the boom B is operated in the contraction direction, the code is reversed. C is wound around the boom motion detecting device 1 by the urging force of all dance springs (described later) of the boom motion detecting device 1. The code C is the hook G
Is connected to a not-shown limit switch or the like attached to detect the upper limit position.

Next, the configuration of the boom motion detecting device 1 will be described with reference to FIG. 2 which is a sectional view of the boom motion detecting device 1. The boom motion detection device 1 is a boom B
It is fixed to a disk-shaped base I attached to the
A support shaft 2 projects in the direction of the base I at the axial center of the movement detecting device 1. The end of the support shaft 2 is supported by the base I. A drum-shaped reel main body 3 rotatably supported by a support shaft 2 for winding the code C is provided with inner and outer flange portions 3b and 3c on opposite sides of a peripheral body portion 3a. At the same time, an output shaft 4 for transmitting the rotation of the reel main body 3 is laterally extended to the axial center portion of the outer flange portion 3c.

The reel body 3 is internally provided with a full dance spring 5, and the base end portion 5a of the full dance spring 5 is a support shaft 2 of the base I.
The front end portion 5b of the full-spring 5 is fixed to the inner surface of the peripheral body portion 3a of the reel body 3. The whole dance spring 5 is arranged in the reel main body 3 in the direction in which the code C is wound.
Since the boom B is actuated in the extension direction and the code C is paid out, the rotation of the reel body 3 causes the full-spring 5 to contract, and then the boom B Is actuated in the shortening direction, the elastic force of the tightly compressed full-spring 5 causes
C is automatically rewound.

The slip ring 6 annularly attached to the inner flange portion 3b of the reel body 3 via the insulator 7 is a reel.
Connection cord C to the base end of the cord C wound around the main body 3
1 is connected. A contact piece 8 whose tip portion is pressed against the slip ring 6 is fixed to the right portion of the outer surface of the base I, and the base end portion of the contact piece 8 is connected to the auxiliary code C2. Therefore, with this configuration, the upper limit position signal from the limit switch or the like connected to the tip of the code C is supplied to the auxiliary code through the code C, the connection code C1, the slip ring 6, and the contact piece 8. -It is output from C2.

A base I for covering the reel body 3
The outer surface of the reel cover 9 is covered. The reel cover 9 rotatably supports the output shaft 4 of the reel main body 3, and an outlet 9a for a code C is provided at an upper portion of the reel cover 9.
Is opened. On the other hand, an outlet 9b for the code C2 is opened in the lower part of the figure. A pinion 11 is attached to the tip of the output shaft 4 of the reel body 3, and a reduction gear 10 that engages with the pinion 11 and reduces the rotation of the output shaft 4 at a predetermined ratio is attached to the reel cover 9. It is worn. The speed reduction ratio of the speed reducer 10 is 1/50 in this example.
Is set to.

The output shaft 10a of the speed reducer 10 has a gear 1
3a is attached, and its gear 13a is a gear 13
It meshes with b. The gear 13b is attached to the input shaft of the potentiometer 12 attached to the bracket 20, and the potentiometer 12 is rotated by the rotation output of the speed reducer 10 via the gear 13a and the gear 13b. It

As shown in FIG. 3, the potentiometer 12 rotates in accordance with the rotation of the resistor 14 wound in a coil shape and curved in an annular shape, and the output shaft 10a of the speed reducer 10. And a sliding contact 14b that continuously rubs against the resistor 14 is formed at the tip, and the electrical resistance between the sliding contact 14b and the end contact 14a of the resistor 14 is linearly increased or decreased. And a slider 15 that operates.

In FIG. 2, the potentiometer 17 attached to the reel cover 9 has a weight 17b attached to the output shaft 17a.
The weight 17b is always oriented in the vertical direction even when the boom B is raised and lowered and the boom movement detecting device 1 is tilted. Therefore, the output shaft 17a is held at a constant rotation position. To be done. As shown in FIG. 3, the potentiometer 17 is configured such that a wiper 17d connected to a weight 17b slides on a resistor 17c bonded in a donut shape. When the boom motion detection device 1 tilts,
The electric resistance between the wiper 17d and the end contact 17e of the resistor 17c changes linearly.

As described above, the boom motion detecting device 1 includes
A potentiometer 12 that outputs an electric signal corresponding to the expansion / contraction position of the boom B and a potentiometer 17 that outputs an electric signal corresponding to the undulation angle of the boom B are provided. The electric circuit is constructed as shown in FIG. That is, a constant voltage of, for example, 24 VDC supplied from a boom control circuit (not shown) is applied to the resistor 14 of the potentiometer 12 via the connector 21 and the computer cable 19 shown in FIG. And both ends of the resistor 17c of the potentiometer 17 are applied.

The core of the computer cable 19 is
P1 and P2 for supplying the constant voltage of 24 V DC from the boom control circuit, and the slider 15 of the potentiometer 12.
Expansion and contraction position detection signal (voltage signal) of boom B
P3 and potentiometer 1 for transmitting the signal to the boom control circuit
The wiper 17d of No. 7 is electrically connected to the output shaft 17a, and only four P4s are required to transmit the undulation angle detection signal (voltage signal) of the boom B to the boom control circuit.

Next, the operation of the boom operation detecting device 1 will be described. In a Rafta-Crane A as shown in FIG. 1,
When the boom B is extended or shortened to move the load E, the reel body 3 is rotated as the code C is fed or rewound, so that the reel C is rewound.
The output shaft 4 of the main body 3 rotates, and the potentiometer 12 is rotated through the gears 13a and 13b which are rotated by the rotational output of the speed reducer 10 which meshes with the pinion 11 at the tip of the output shaft 4.
Is rotated. As a result, a voltage signal (expansion / contraction) corresponding to the expansion / contraction position of the boom B is expanded from a slider 15 having a rubbing contact 14b formed at the tip thereof so as to continuously rub against the resistor 14 of the potentiometer 12. Since the position detection signal) is output,
The boom control circuit can recognize the expansion / contraction position of the boom B based on the expansion / contraction position detection signal.

On the other hand, when the boom B is driven up and down, the boom operation detecting device 1 also becomes in an inclined state, but the potentiometer 1
Since the weight 17b of 7 always indicates the vertical direction by its own gravity, the output shaft 17a is rotated and the wiper 17d connected to the output shaft 17a is bonded to the resistor 17 in a donut shape.
slide on c. As a result, the voltage signal corresponding to the electric resistance change between the wiper 17d and the end contact 17e is output from the output shaft 17a as the undulation angle detection signal, and the boom control circuit is based on the undulation angle detection signal. The undulation angle of the boom B can be recognized.

As described above, the boom operation detecting device 1 which detects the expansion / contraction position and the undulation angle of the boom B and outputs the expansion / contraction position detection signal and the undulation angle detection signal is compactly integrated. Since the expansion / contraction position detection signal and the undulation angle detection signal can be transmitted to the boom control circuit by using one computer cable 19 as the detection signal line and the connector 21, the rafter crane A It is easy to attach and replace the boom operation detecting device 1 to and from, and wiring work is also simplified.

[0021]

As described above, according to the present invention, when a boom which is mounted on an industrial vehicle and is expanded and contracted and undulated is expanded and contracted, the expansion and contraction operation is converted into a rotational operation and output. Section, an expansion / contraction position detection body that outputs an expansion / contraction position detection signal of the boom corresponding to the electric resistance value when rotated with the rotation of the rotation conversion section, and with the undulating motion of the boom. Since the boom motion detection device is configured by disposing each of the undulation angle detection body which is activated and outputs the undulation angle detection signal corresponding to the undulation angle associated with the undulation motion in one case, the boom motion detection device is configured. This has the effect of facilitating the work of attaching the boom operation detecting device to and the work of wiring.

[Brief description of drawings]

FIG. 1 is a side view showing the overall structure of a rafter crane.

FIG. 2 is a cross-sectional view of a boom motion detection device.

FIG. 3 is an electric circuit diagram of a boom operation detecting device.

[Explanation of symbols]

 A Rafter crane B boom C code 1 boom motion detection device 2 spindle 3 reel body 4 output shaft 5 full-spring spring 9 reel cover 10 speed reducer 12 potentiometer 14 Resistor 15 Slider 17 Potentiometer 17a Output shaft 17b Weight 17c Resistor 17d Wiper 19 Computer cable 21 Connector

Claims (1)

[Claims] 1. A rotation conversion unit for converting the expansion / contraction operation into a rotation operation and outputting the rotation conversion unit when the boom that is installed in an industrial vehicle and is expanded / contracted and undulated is expanded / contracted. An expansion / contraction position detection body that outputs an expansion / contraction position detection signal of the boom corresponding to the electric resistance value when rotated,
It is characterized in that each of the boom and the undulation angle detector, which is operated in accordance with the undulation motion of the boom and outputs the undulation angle detection signal corresponding to the undulation angle associated with the undulation motion, is arranged in one case. Boom motion detection device for industrial vehicles.