JPS61254496A - Safety device for crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a crane safety device that ensures the safety of workers during the operation of automatic crane equipment. [Technical Background of the Invention and Problems thereof] Recently, FMS (Flexible Manufacturer)
With the spread of automation of manufacturing equipment, such as turing systems (flexible production systems), automation of various conveyance operations is also being actively promoted. For example, automation of crane transport work is now performed by automatic crane devices that operate without requiring human labor based on work programs stored in a control device.

By the way, when this automatic crane device is employed, workers who work within this automatic crane travel area must always keep a close eye on the movements of the crane because there is no crane operator. This poses a problem in that work efficiency is significantly reduced. On the other hand, if the operating area of the automatic crane is completely separated from the worker, the safety issue will be resolved, but on the other hand, the movement area of the worker will be severely restricted, and extra space will be required to ensure safety. This creates the inconvenience of having to provide a Furthermore, automatic crane systems cannot prevent collisions caused by runaway, control errors, etc., which hinders the widespread use of automatic crane systems and, in turn, prevents production consolidation.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a crane safety device that detects obstacles within a certain range from a gripping part of a crane to ensure safe crane travel. .

[Summary of the invention]

A polyhedral mirror collects the infrared rays emitted from obstacles to the movement of the crane, and an infrared sensor converts the collected infrared rays into an electrical signal. Based on this electrical signal, the presence or absence of the obstacle is determined. It is something.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

1 to 3 show the construction of the crane safety device of this embodiment. This crane safety device includes a pair of infrared detection parts (2a) attached to a crane (1),
(2b), and a foreign object determination section (3) which is connected to the output side of these infrared detection sections (2a) and (2b) and performs a process of determining the presence or absence of a foreign object (M) such as a person within the detection area (R). and,
An operation control unit (5) that automatically controls the operation of the rinin (1) and outputs a foreign object determination unit (31K determination instruction signal SD).
), and an alarm generating section (6) mounted on the crane (1) and connected to the output side of the foreign object determining section (3) to generate an alarm sound. The crane (1) has a guide rail (not shown) installed on the ceiling, and a drive mechanism (not shown) mounted on the guide rail that moves the crane (1) based on the operation instruction signal SM from the operation control section (5). (not shown) and a conveying body (force) vertically installed on this drive mechanism (see Figure 2). This conveying body (7) is attached to a support shaft (
8) and the conveyed object (9) connected to the lower end of this support shaft (8).
) and a U-shaped grip part α1 for detachably gripping the handle. This grip part <11 is the support shaft (8) K
It is directly connected to the base body αυ.

It consists of L-shaped grips (12a) and (12b) attached vertically below the base body συ so as to be able to move toward and away from each other. Then, these grips (12a), (
12b), each has an infrared detection section (2a) at its lower end.
, (2b) are installed. Since these infrared detecting sections (2a) and (2b) have the same structure, the structure of one infrared detecting section (2a) will be explained. That is, as shown in FIG. 3, the infrared detection section (2a)
A cup-shaped holder (1st floor) and a polyhedral mirror (141) whose cross section forms an arc integrally fixed to the inner surface facing this holder,
It consists of an infrared sensor (ISl) that is fixed to the center of this polyhedral mirror (14) and detects infrared rays and converts them into electrical signals. It consists of multiple segmented plane mirrors. That is, the detection region (R) is expanded by the polyhedral mirror α, and the detection sensitivity of the foreign object (M) within the detection region (R) is increased.

Furthermore, the infrared sensor haze is PbS, In8b.

Quantum type materials using semiconductors such as HgCdTe are preferred. In addition, when using a thermal type such as a thermistor or thermomobile as the infrared ray α9, the wavelength is 7 to 14 μm.
It is necessary to install an optical filter that only transmits infrared rays.

On the other hand, the foreign object determination section (3) is installed together with the operation control section (5) which is installed apart from the grip section α1. The configuration consists of a pair of infrared detectors (2
a), (2b) infrared sensor (amplifier (1υ, αe) whose input side is connected to the output side of the sensor (19), input side connected to the output side of these amplifiers, outputs a binarized signal according to the setting value ■T Binarization circuit ση, (lη and these two
Value conversion circuit α7), an OR gate 0 seconds whose input side is connected to the output side of C1η, and an AND gate α■ whose input side is connected to the output side of the OR gate and the output side of the operation control unit (5). It consists of h. However, this AND game)
(The output side of 11 is the alarm generation part (6) and the operation control part (
5). On the other hand, the operation control section (5) is mainly composed of, for example, a microcombiègue, and outputs an operation instruction signal SM to the drive mechanism based on a predetermined operation plan, and at the same time outputs an operation instruction signal SM to the drive mechanism as shown in FIG. ) during the operation period of the AND game)
(The button is set to output to the input side of 11.
, 4 Next, the operation of the crane safety device having the above configuration will be described. (See Fig. 4) First, based on the operation instruction signal 8M from the operation control section (5), the conveyed object (9) is gripped by the grips (12a) and (12b), and then the drive mechanism is started and a predetermined position is set. This conveyed object (9) is transported to the location. During this transportation period, if foreign matter (particles) is present in the conveyance path, this foreign matter (M
) radiates in all directions a unique infrared ray caused by, for example, body temperature. Therefore, the crane (1) moves,
This foreign material (M) is
), the infrared rays ■ enter the detection area (R) of the polyhedral mirror σ
4), (14), and the collected infrared rays are sent to the infrared sensor α9. In the haze, it is converted into detection signals SAl, SAz having voltages corresponding to the infrared intensity. Next, these detection signals SAI and SA2 are processed by an amplifier (
ls, (amplified in lE9. At this time - foreign matter (
Suppose that M) is very close to one of the grips (12a). As a result, among the detection signals SAI and SA2 input to the binarization circuits αη and αη, the detection signal SAI output from one infrared detection section (2a) attached to the grip (12a) exceeds the set value vT. Exceeds, logical value "1"
The abnormal signal 8B1 is output to OR, G) (18).

On the other hand, the infrared detection unit (2) attached to the grip α2b)
The detection signal SA2 output from b) does not exceed the set value, and no abnormal signal is output to the OR gate α peak. Thus, the abnormal signal SBl passes through the OR gate α
Gate (Input to one input terminal of LI. At this time,
From the operation control unit (5), a judgment instruction signal SD with a logical value of "1" is input to the other input terminal of the AND gate (19).As a result, from the AND gate α value, the danger detection signal The SC controls the alarm generation section (6) and the operation control section (5).
) is output. Therefore, the alarm generating unit (6) which manually generates the danger detection signal SC emits an alarm sound such as a buzzer, and the foreign object (CM) is alerted by the worker and removed from the detection area (R). urge people to evacuate. On the other hand, the operation control section a4, which has input the danger sensing signal SC, outputs a signal to the drive mechanism to stop the movement of the crane (1). Thus, the crane (1) stops before colliding with the foreign object (4), and accidents are avoided.

As described above, the crane safety device of this embodiment automatically detects obstacles to the safe movement of the crane (1), issues an alarm, and stops the movement of the crane (1). Therefore, collisions of the crane (1) with obstacles and personal accidents can be avoided. TokuK,
The crane (1) itself has an infrared detection section (2a), (2
b), safety within the movement area of the crane (1) can be ensured. Therefore, it has the advantage that it is not affected by layout changes within the factory and does not require new expenses.

Note that the number of infrared detection sections may be increased or decreased as necessary. In addition, as a means of avoiding danger, only one of generating a warning sound and stopping movement of the crane may be used.

Furthermore, the installation location of the alarm generating section is not limited to the crane, and a space in the factory where the crane is installed may be used. Furthermore, the detection signal output from the infrared detection section is output to an analog-digital (A/D) converter, and after A/D conversion, level judgment is performed using a micro combinatorial unit, and the detection signal is determined according to the degree of the level. Safety measures may be taken.

〔Effect of the invention〕

The crane safety device of the present invention automatically detects obstacles to the safe movement of the crane and outputs a danger detection signal, thereby ensuring safety in crane work. In particular, this device is used for automatic crane K II! In the case of a'11', -9, not only work safety is improved but also the operation rate, productivity, etc. are improved, which is a special effect.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a crane safety device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the main parts of the crane, Fig. 3 is a perspective view of an infrared detection section, and Fig. 4 is a diagram for identifying different parts. This is a timing chart. (1): Crane, (2a), (2b)... Infrared detection section, (3): Foreign object determination section, α4: Polyhedral mirror, (
1!9: Infrared sensor, (R): Detection area, (M):
Foreign objects (obstructions) 0 Agent Patent attorney Noriyuki Chika (and 1 other person)

Claims (1)

[Claims] A crane safety device characterized by having the following configuration. (b) A crane that has a polyhedral mirror that collects infrared rays emitted within a certain detection area and an infrared sensor that converts the infrared rays collected by this polyhedral mirror into electrical signals, and that moves while holding a conveyed object. Infrared detection section installed on. (b) A determination unit that determines the presence or absence of an obstacle to the movement of the crane within the detection area based on the electrical signal output from the infrared sensor.