JP2006306526A - Crane alarm device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crane alarm device having less noise pollution, easily applicable to various kinds of hooks, and highly versatile. <P>SOLUTION: An alarm system comprises a portable alarm 10 which can be attachably/detachably hanged from a hook 3 of a crane via a wire 11, and a portable radio transmitter 20 to be held by a slinging responsible person 7 and manually operated. In the alarm 10, an electronic buzzer 12, a radio receiver 13, a dry battery type power supply 14, and a manual power supply switch 17 are stored in a casing of a compact container. When the slinging responsible person 7 determines that an alarm is required, the radio transmitter 20 is operated to transmit the ON-signal. The ON-signal is received by the radio receiver 13, and the electronic buzzer 12 is operated, and an alarm sound is generated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a crane warning device for safely performing crane work.

There is a crane alarm device that warns a surrounding worker under a suspended load that a suspended load is moving during a crane operation in which a suspended load of material is slung on a crane hook. This crane warning device is known as a warning system in which a crane operator or a field supervisor issues a warning from a speaker installed on a work site by wire or wirelessly, and a human body detection sensor is attached to a hook that moves with a suspended load. (Infrared sensor) and an alarm device (see, for example, Patent Document 1) in which a synthetic sound generator is fixedly arranged, a sensor (such as an acceleration sensor) that detects the movement of the hook itself to the hook, an alarm speaker, a warning light, and a power source An alarm device (for example, see Patent Document 2) in which a power generation device or the like is fixedly arranged is known.
Japanese Patent Laid-Open No. 06-56385 JP-A-10-109886

  The wired / wireless alarm system by the operator and the field supervisor generates an alarm at the same time as a sling that hangs a suspended load on a crane hook, so that a continuous sound is generated at the work site during the entire time of crane work. For this reason, the field worker may become accustomed to the alarm sound generated continuously, and may not notice even if the suspended load approaches the hook. Also, continuous sound may be heard as continuous noise by neighboring residents near the work site.

  In an alarm device in which a human body detection sensor and a synthetic voice generator are attached to a hook of a crane, when a moving hook and a suspended load approach a site worker, the human body detection sensor detects the worker and emits an alarm sound. However, in reality, human body detection sensors may not only detect human bodies, but may also detect and malfunction due to fluctuations in moving hooks and suspended loads, temperature differences at the work site, and reflections of light from the work site. Even if it is not detected, an alarm sound may be generated continuously when the hook moves. In addition, each of the human body detection sensor and sound generator is attached to the hook with an attachment band, etc., but this installation work is cumbersome and troublesome, and depending on the shape of the hook, it can not be attached stably. There is a problem that the shape and size of the hook that can be applied are limited.

  In addition, a device that generates a warning sound by detecting the movement of the hook itself becomes a complicated and expensive warning device because various sensors and power generation devices are assembled to the hook in addition to the problem of generating a continuous sound. Such an expensive alarm device is not a problem in terms of capital investment to be attached to a large hook such as a climbing crane, but it is considerably expensive in terms of capital investment to be attached to a medium hook or small hook. There are practical problems that are difficult to adopt in cranes. In addition, since multiple parts such as various sensors, power generators, and batteries are attached to the hooks, the installation work is complicated and cumbersome in this case, and the applicable hook shapes and sizes are limited. There was a bug to be done.

  The present invention has been made in view of such circumstances, and the object of the present invention is to minimize the noise nuisance applied to the neighboring residents of the crane work site and to be easily applied to a wide variety of hooks. The object is to provide a crane warning device having excellent versatility.

  In order to achieve the above object, the present invention provides an alarm electronic buzzer and a radio receiver that receives a radio signal and activates the electronic buzzer on a casing that is detachably supported by a crane hook. And a portable alarm device storing a common dry battery power source in an electronic buzzer, and a portable wireless transmitter for transmitting a radio signal to a wireless receiver of the alarm device.

  Here, the hook of the crane is a rigid body suspended by a crane wire suspended from the boom tip of the crane, and includes a rigid body block in which a hook-shaped rigid hook is fixed or connected to the lower end. A portable alarm device is removably suspended on this hook with a dedicated suspension wire. The hook moves the portable alarm and the suspended load as they are, and moves as they are. The portable alarm device stores an electronic buzzer, a wireless receiver, and a dry cell type power source shared by the two in a casing which is a waterproof and dustproof container. The dry batteries are a plurality of commercially available AA batteries, and are attached to a battery case fixed in the casing in a replaceable manner. As the electronic buzzer, a small and inexpensive buzzer that generates a flicker sound of about 50 to 90 dB or a continuous alarm sound can be applied. The radio receiver has a simple function of operating an electronic buzzer by turning on a built-in relay contact when receiving a radio signal from the outside. Therefore, a small and inexpensive receiver with a simple structure can be applied. These electronic buzzers and wireless receivers are power-saving small devices. For example, a 12V DC power supply unit with 8 AA batteries can be applied as a power source of the wireless receiver. Such a portable alarm device can be set simply by suspending it from the hook of a crane using a hanging wire that is detachably attached to the housing, so that conventional installation work on the hook becomes unnecessary. In addition, since the portable alarm is hung on the crane hook, the alarm can be easily and securely set on any of a wide variety of hooks of different shapes and sizes, and can be easily removed from the hook. be able to.

  A portable radio transmitter can be applied to a small remote controller (remote controller) that is manually operated by a person at the crane work site, such as a crane operator, a field supervisor, or a person in charge of the crane. This wireless transmitter has, for example, a single AAA battery as a power source, and includes one button switch. When moving a crane with a suspended load on the hook of the crane, the on-signal is sent and the alarm is hung on the hook when the button manager presses the button switch once when necessary with the wireless transmitter in hand. An electronic buzzer is activated and an alarm is issued to the worker at the work site. When the person in charge of the ball presses the button switch again, an off signal is transmitted next and the electronic buzzer stops. In this way, since the person in charge of the ball operates the electronic buzzer only when necessary, it is possible to effectively alert the workers, reduce the noise given to the local residents at the work site, and reduce the waste of power consumption. Long life.

  In the present invention, the casing of the portable alarm device is attached to and detached from a cylindrical main body portion having an upper and lower opening, a bottom portion of a raised bottom structure formed at a height above the lower end of the main body portion, and an upper end opening of the main body portion. Alternatively, it is a waterproof and dustproof container having a lid portion that can be freely opened and closed, and can have a structure in which a sound emission port of an electronic buzzer and an antenna of a wireless receiver are disposed on the bottom surface of the bottom portion.

  A cylindrical body, an elliptical cylindrical body, or a polygonal cylindrical body having upper and lower openings can be applied to the main body portion of the casing here. A bottom portion is formed integrally with the main body portion, and a lid portion is installed on the main body portion. The sound outlet of the electronic buzzer is installed downward at the bottom center of the bottom, and the bar antenna of the wireless receiver is installed around the bottom of the bottom. The sound outlet and the antenna are provided at a position deeper than the lower end of the main body so that the sound outlet and the antenna do not touch the ground even when the main body is placed on the ground. The part below the bottom part of the main body part is a cylindrical skirt part that extends right below the periphery of the bottom part. This skirt part acts as a sound insulation wall that regulates the angle of sound spreading downward from the sound outlet on the bottom bottom surface, and this action allows the sound emitted from the sound outlet to be an effective alarm sound just below and near the hook. Propagate as Therefore, an alarm sound can be effectively emitted to the crane work site without increasing the volume of the electronic buzzer. In addition, effective sound propagation directly below and near the hook reduces the amount of sound emitted to the side of the hook, and the volume of sound propagated as noise to neighboring residents at the work site is reduced.

  Moreover, in this invention, a power switch can be interposed between the dry cell type power supply in the housing and the wireless receiver. Further, the power switch can be a manual switch, and the manual operation unit can be disposed on the lower surface of the bottom of the casing.

  As the manual power switch here, one having a manual operation unit installed in a part of the alarm housing can be applied. At the time of hanging or hanging the alarm or suspended load on the hook of the crane or at the end of the work, manually switch the power switch of the alarm from OFF to ON so that the alarm can be activated. In this way, even if an on signal is transmitted from the portable wireless transmitter during or before the slinging operation, the alarm device does not operate and no noise is generated. When the staking work is finished and the crane work is started, the alarm device is ready to operate at any time, so when the person in charge looks at the situation at the work site and needs an alarm, the portable wireless transmitter When an on signal is transmitted by manually operating the alarm, an alarm sound is emitted from the alarm suspended from the crane hook, alerting the workers directly under and around the crane load, Risks associated with work can be avoided. Even if the alarm housing collides with the building during crane operation, the skirt portion at the bottom of the housing protects the manual operation portion of the power switch, and there is no possibility that the manual operation portion is switched off.

  According to the present invention, when an alarm is required at the time of crane operation, an alarm sound hung on the hook is generated to warn the field worker by generating an alarm sound of an electronic buzzer. It is possible to provide a crane warning device that does not cause troubles in the vicinity of the work site without generating continuous sound. In addition, the portable alarm that can be attached to and detached from the hook of the crane does not require installation work on the hook. Installation burden on the hydraulic crane can be reduced, and safety can be improved. Also, suspended and portable alarms can be easily attached to and detached from any of a wide variety of hooks regardless of the shape and size of the hooks. Can be installed as. In addition, the crane alarm device consisting of a portable alarm device and a portable wireless transmitter is small and lightweight, can be manufactured at low cost, is easy to bring to the site, and can be used immediately when necessary, and has practical value. And has the effect of excellent versatility.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 shows an alarm system equipped with a crane alarm device of the present invention. A hook 3 is suspended by a crane wire 2 suspended from the tip of a boom 1 of the crane, and a portable alarm device 10 and a suspended load 5 are slung on the hook 3. The boom 1 is turned to move the hook 3 together with the alarm device 10 and the suspended load 5 in the horizontal direction (crane work). The hook 3 includes a hook-shaped hook 3a and a rigid block 3b that fixes the hook-shaped hook 3a to the lower end. The alarm device 10 is suspended from the hook-shaped hook 3a by the hanging wire 11, and the suspended load 5 is suspended from the same hook-shaped hook 3a by the slinging wire 6 to perform the slinging operation. A wire hooking portion (not shown) may be provided on the rigid block 3b, and the alarm device 10 may be slung here.

  The crane alarm device of the present invention includes a portable alarm device 10 that is slung on the hook 3, and a portable wireless transmission that is manually operated by a person in charge at the rigging site, a supervisor at the site, a worker, a crane operator, and the like. Machine 20 is provided. In FIG. 1, the person in charge 7 is holding the wireless transmitter 20.

  As shown in FIG. 2, the portable alarm device 10 has one housing 11 that is a small container. An electronic buzzer 12, a wireless receiver 13, and a dry cell power source 14 as shown in the circuit diagram of FIG. The dry cell power source 14 is a DC power source common to the electronic buzzer 12 and the wireless receiver 13. In addition, a manual power switch 17 is stored in the housing 11.

  A specific example of the alarm device 10 is shown in FIG. The casing 11 is a waterproof and dustproof container made of ABS resin with a bottomed top cover. For this container, a waterproof / dustproof grade [IP-54] box is applied. A pair of attachment pieces 31 are integrally provided at both upper ends of the housing 11. The pair of attachment pieces 31 protrude upward from the housing 11, and both end portions of one suspension wire 32 are detachably connected to the protrusion via a one-touch type joint fitting 33. The central portion of the suspension wire 32 is slung on the hook 3. The detent ring 34 is engaged with the central portion of the suspension wire immediately below the hook 3 with one touch, and the posture of the suspension wire 32 is stabilized.

  The casing 11 includes a cylindrical main body portion 11a having an upper and lower opening, a bottom portion 11b formed at a predetermined height position from a lower end of the main body portion 11a, and a cap-shaped lid portion detachably installed at the upper end opening of the main body portion 11a. 11c. The electronic buzzer 12 and the power switch 17 are fixed to the upper surface of the bottom portion 11b, and the flat wireless receiver 13 is fixed on the electronic buzzer 12. A battery case 15 constituting a dry battery type power supply 14 is fixed on the wireless receiver 13, and a plurality of dry batteries, for example, eight AA dry batteries 16 are accommodated in the battery case 15. The battery case 15 is fixed to a waterproof partition member (not shown) hermetically sealed with the wireless receiver 13. The battery case 15, the wireless receiver 13, and the power switch 17 are wired, and the wireless receiver 13, the power switch 17, and the electronic buzzer 12 are wired to constitute the buzzer alarm circuit of FIG. Eight AA batteries 16 are accommodated in two upper and lower stages in a battery case 15 and connected in series to constitute a 12V DC power supply circuit. A lid 11 c is installed on the battery case 15. The lid portion 11c is a screw lid separate from the main body portion 11a, and is screwed to the inner periphery of the upper end portion of the main body portion 11a. A handle portion is provided on the upper surface of the lid portion 11c so that the lid portion 11c can be easily screwed manually into the main body portion 11a. A ring-shaped packing is interposed between the upper end of the main body portion 11a and the lower surface peripheral edge portion of the lid portion 11c, so that the housing 11 has waterproof and dustproof performance. The lid 11c is removed from the upper end opening of the main body 11a, and the dry battery 16 of the battery case 15 is replaced. Removing the lid 11c facilitates battery replacement.

  In addition, the sound emission port 12 ′ of the electronic buzzer 12 is installed downward at the center of the lower surface of the circular bottom portion 11 b. The rod-shaped antenna 13 'of the radio receiver 13 protrudes downward at one of two positions opposite to the bottom surface of the bottom portion 11b at 180 °, and the manual operation portion 17' of the power switch 17 is installed at the other. The skirt portion 11d below the bottom portion 11b of the main body portion 11a is cylindrical, and the height of the skirt portion 11d is set larger than the length of the antenna 13 '. With this setting, the antenna 13 'does not protrude from the lower end opening of the skirt portion 11d. The sound emission port 12 ′ and the power switch manual operation unit 17 ′ exposed on the lower surface of the bottom portion 11 b are at a height position sufficiently recessed from the lower end opening of the skirt portion 11 d. The skirt portion 11d functions as a protective wall that surrounds the sound emission opening 12 ', the antenna 13', and the manual operation portion 17 'on the lower surface of the bottom portion 11b and protects it from an external impact force. Further, the skirt portion 11d functions as a sound insulation wall that regulates the downward angle θ of the warning sound emitted from the sound emission port 12 'at the center of the bottom surface of the bottom portion 11b.

  As shown in FIG. 5, the portable wireless transmitter 20 includes a flat resin case 21 that can be held with one hand. A power source of the single 5 type dry battery 22 is accommodated in the resin case 21. When the button switch 23 installed on a part of the resin case 21 is pressed once with a finger, an on-signal radio signal is transmitted. When the button switch 23 is pressed once again, an off-signal is transmitted. And the off signal is repeatedly transmitted. 5 is a strap attachment hole formed in the resin case 21.

  The operation of the unloading alarm in the crane work of FIG. 1 will be described. The alarm device 10 is hung on the hook 3 and the manual operation portion 17 ′ of the power switch 17 in FIG. 4 is manually turned on, so that the alarm device 10 is always on standby. The crane 5 is started by hanging the suspended load 5 on the hook 3, and the person in charge 7 monitors the operation with the wireless transmitter 20 in hand. When the suspender 7 sees that the suspended load 5 moves and approaches the field worker and presses the button switch 23 of the wireless transmitter 20 once, an ON signal is transmitted to the alarm device 10 that moves with the suspended load 5. Is done. When the wireless receiver 13 of the alarm device 10 receives the ON signal from the wireless transmitter 20 via the antenna 13 ', the relay contact is turned on to connect the electronic buzzer 12 to the power source 14, and the electronic buzzer 12 is activated. An alarm sound is generated. The warning sound is emitted downward from the sound emission port 12 'at the center of the bottom surface of the bottom 11b of the housing 11, and the spread angle θ is determined by the skirt portion 11d. Therefore, an alarm sound is emitted toward the suspended load 5 directly below the alarm device 10 to warn the lower part of the suspended load 5 and the vicinity thereof. Therefore, an alarm is effectively given to the worker under the suspended load, and danger is avoided. In addition, the alarm sound is not transmitted so much to a nearby place far away from the suspended load, so that the sound volume heard as noise by neighboring residents is reduced and hardly causes noise pollution.

  When it is determined that the danger in the crane work has been avoided, the bead manager 7 presses the button switch 23 of the wireless transmitter 20 once again at any time even if the crane work is continued. Then, an off signal is transmitted, and the radio receiver 13 of the alarm device 10 receives this off signal to turn off the relay contact. With this off, the electronic buzzer 12 is disconnected from the power source 14 and stops operating, and the alarm sound disappears. In this way, the judgment of the slinging person 7 who is most familiar with the slinging operation makes the alarm device 10 actuated only when necessary, so that the alarm effect is enhanced and the alarm device 10 does not consume wasteful power. The service life of the battery is extended and the frequency of battery replacement is reduced.

  In addition, the crane warning device of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

1 is a side view schematically showing a crane work site equipped with a crane alarm device according to the present invention. FIG. 2 is an enlarged view of a crane hook and an alarm device in FIG. 1. It is a circuit diagram of the crane warning device in FIG. It is an enlarged side view including the partial cross section of the alarm device of FIG. It is a top view of the radio transmitter of the crane warning device in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boom 2 Crane wire 3 Hook 3a Hook-like hook 3b Rigid block 5 Hanging load 6 Wire 7 Hook manager 10 Portable alarm 11 Hanging wire 11 Housing | casing 11a Main body part 11b Bottom part 11c Cover part 11d Skirt part 12 Electronic buzzer 12 ' Sound outlet 13 Radio receiver 13 'Antenna 14 Battery power source 15 Battery case 16 Dry battery 17 Manual power switch 17' Manual operation unit 20 Portable wireless transmitter 21 Resin case 22 Dry battery 23 Button switch

Claims (4)

An alarm electronic buzzer and a radio receiver that receives a radio signal and activates the electronic buzzer in a casing that is detachably supported by a hook of the crane, and a dry cell type power source shared by the radio receiver and the electronic buzzer And a portable alarm device comprising:
A portable wireless transmitter for transmitting a wireless signal to the wireless receiver;
A crane alarm device comprising:   The casing is a waterproof and dustproof container having a cylindrical main body portion with an upper and lower opening, a bottom portion formed above the lower end of the main body portion, and a lid portion detachably or detachably installed at the upper end opening of the main body portion. The crane warning device according to claim 1, wherein a sound emission port of the electronic buzzer and an antenna of the wireless receiver are disposed on the bottom surface of the bottom portion.   The crane alarm device according to claim 1, wherein a power switch is interposed between the power source and the wireless receiver.   The crane alarm device according to claim 3, wherein the power switch is a manual type, and a manual operation portion thereof is disposed on a lower surface of the bottom portion.