JP2016153558A - Emergency shutdown device and emergency shutdown method of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure safety of a worker who works around a construction machine.SOLUTION: When a worker 280 who wears an IC tag 260 emitting an electric wave in response to a magnetic field comes into the magnetic field (predetermined range A) generated by a magnetic field generation device 220 mounted on a tire roller 100 with a negative brake, an emergency shutdown device shuts down an engine of the tire roller 100 by detecting the electric wave emitted from the IC tag 260. When the engine of the tire roller 100 is shut down, the negative brake is operated to immediately stop the tire roller 100.SELECTED DRAWING: Figure 9

Description

  The present invention relates to an emergency stop device and an emergency stop method for a construction machine.

  In order to ensure the safety of workers working around the construction machine, as described in JP-A-10-237906 (Patent Document 1), when the construction machine approaches the worker, Techniques for issuing warnings using light have been proposed.

JP-A-10-237906

  However, since there is a risk of noise complaints during night work, it may not be possible to issue an alarm with sound, and it may be difficult to ensure the safety of the worker. In addition, the operator or worker of the construction machine is accustomed to issuing an alarm, so that the degree of alarm recognition is reduced and the safety of the operator may not be ensured.

  Then, an object of this invention is to provide the emergency stop apparatus and emergency stop method of a construction machine which ensured the safety | security of an operator by making the emergency stop of a construction machine.

  For this reason, in the present invention, when an operator wearing an IC tag that emits radio waves in response to a magnetic field enters a magnetic field generated by a magnetic field generator installed in a construction machine equipped with a negative brake, The radio wave transmitted from the IC tag is detected, the engine of the construction machine is stopped, and the construction machine is urgently stopped by the negative brake.

  ADVANTAGE OF THE INVENTION According to this invention, a worker's safety can be ensured by carrying out an emergency stop of a construction machine.

It is a side view which shows an example of a tire roller. It is a perspective view which shows an example of a tire roller. It is explanatory drawing which shows an example of the magnetic field which generate | occur | produces behind a tire roller. It is a side view which shows an example of an engine stop apparatus. It is a top view which shows an example of an engine stop apparatus. It is a top view which shows the 1st modification of an engine stop apparatus. It is a top view which shows the 2nd modification of an engine stop apparatus. It is explanatory drawing which shows the effect | action of an engine stop apparatus. It is a perspective view for demonstrating an effect | action of an emergency stop apparatus.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings.
FIG.1 and FIG.2 shows an example of the tire roller used for the secondary rolling of a banking roadbed and a roadbed, the surface finishing of asphalt pavement, etc. FIG. A tire roller is an example of a construction machine.

  The tire roller 100 includes a self-propelled vehicle body 120, a front wheel 140 made up of three tires, a rear wheel 160 made up of four tires, and a driver's seat 180. The vehicle body 120 travels by driving a hydraulic pump with an engine such as a diesel engine or a gasoline engine, and driving a hydraulic motor with the hydraulic pressure. In addition, the vehicle body 120 is provided with a negative brake to ensure safety when parking, in which the brake is activated when the engine is not operating and is released when the engine is operating. Yes. The driver's seat 180 has a seat 182 on which the operator 200 is seated, a steering wheel 184 for steering, an operation panel 186 on which pedals, levers, switches, instruments, rotary key switches, and the like are arranged, a canopy 188, Is arranged. The canopy 188 is provided with a rotating lamp 190 for notifying that the emergency stop device is operating. The tire roller 100 travels on the roadbed at the construction site, for example, according to the operation of the operator 200, and performs secondary rolling of the roadbed with the front wheels 140 and the rear wheels 160.

  As shown in FIG. 3, a pair of left and right magnetic field generators 220 that generate a magnetic field in a predetermined range A behind the tire roller 100 are attached to the left and right ends of the rear portion of the vehicle body 120. The magnetic field generator 220 is controlled by a controller 240 with a built-in microcomputer. For example, the predetermined range A for generating a magnetic field can be arbitrarily changed by changing the strength of the magnetic field in accordance with a control signal from the controller 240. . Here, the controller 240 can be installed in the vicinity of the driver's seat 180, for example.

  When an operator 280 wearing an IC tag 260 that emits radio waves in response to a magnetic field enters the predetermined range A behind the tire roller 100, as shown in FIG. In addition, an antenna 300 for receiving radio waves transmitted from the IC tag 260 is attached. Here, the IC tag 260 employs a semi-active type that is activated when a magnetic field is detected, whereby consumption of the internal battery can be suppressed. Further, since the IC tag 260 is small and lightweight, it can be attached to the helmet of the worker 280 or put in the pocket of the worker 280.

  And the controller 240 monitors the output signal of the antenna 300, for example, detects the electromagnetic wave transmitted from the IC tag 260 based on the change. Therefore, the controller 240 and the antenna 300 can be cited as an example of a detection device that detects a radio wave transmitted from the IC tag 260 in response to the magnetic field generated by the magnetic field generation device 220.

  Further, an engine stop device 320 shown in FIGS. 4 and 5 is attached to the vehicle body 120 of the tire roller 100, which stops the engine mounted on the vehicle body 120 when the controller 240 detects radio waves. The engine stop device 320 stops the engine by rotating the rotary key switch 340 to the stop position.

  The engine stop device 320 includes a substantially rectangular parallelepiped housing 322, an electric motor 324, a first member 326 that is detachably attached to the key switch 340, and a second member fixed to the output shaft 324A of the electric motor 324. A member 328, an amplifier 330, a control board 332, and a proximity switch 334 are included.

  The housing 322 is made of a metal such as an aluminum alloy or stainless steel or plastic, and is detachably fixed to the vehicle body 120 of the tire roller 100 via a fixing tool such as a suction cup, a magnet, or a double-sided tape. In addition, a slit (not shown) that allows the first member 326 to slide is formed on the upper surface of the housing 322 on a surface perpendicular to the rotation shaft 340 </ b> A of the key switch 340.

  The electric motor 324 is fixed inside the housing 322 via fastening means such as screws, for example, so that the output shaft 324A is parallel to the rotation shaft 340A of the key switch 340. When the output torque of the electric motor 324 is insufficient, a reduction gear can be connected to the output shaft 324A.

  The first member 326 is made of a substantially L-shaped metal or plastic in a side view, and is detachable from the key switch 340 with respect to the key switch 340. That is, the first member 326 has a shape in which one corner of a rectangular shape is cut into a rectangular shape (substantially L-shaped) when viewed from the front, and the key switch 340 can be attached and detached along the stepped portion. A slit 326 </ b> A is formed to fit into the. When the first member 326 is attached to the key switch 340, the first member 326 is moved downward from above the key switch 340 with the slit 326A of the first member 326 downward, and the slit 326A enters the slit 326A. The key switch 340 is fitted. Then, the key switch 340 is slid to the innermost part of the slit 326A of the first member 326 while penetrating the tip 326B of the first member 326 (the opening side end of the slit 326A) through the slit of the housing 322. .

  Note that the first member 326 is not limited to the shape shown in FIGS. 4 and 5, and has, for example, a substantially U shape (U shape) shown in FIG. 6 and a simple rectangular shape shown in FIG. You can also When the first plate member 326 has a rectangular shape, for example, the first member 326 can be attached to the key switch 340 via a fixture such as a clip. In short, the first member 326 only needs to be detachably attached to the key switch 340, and the tip 326 </ b> B only has to extend outward from the key switch 340.

  The second member 328 is made of a thin plate-shaped metal or plastic, and a base end portion 328A thereof is fixed to the output shaft 324A of the electric motor 324. In addition, a pin member 328 </ b> C that rises perpendicularly from the plate surface in the direction of the first member 326 is provided upright at the tip 328 </ b> B of the second member 328. Note that, in the second member 328, the tip end portion 328 </ b> B may be bent in the direction of the first member 326 instead of the pin member 328 </ b> C.

  Therefore, when the electric motor 324 is operated, the pin member 328C of the second member 328 moves on a circle around the output shaft 324A of the electric motor 324 as shown in FIG. The first member 326 is rotated around the rotation shaft 340A of the key switch 340 in contact with the peripheral edge. Then, in conjunction with the rotation of the first member 326, the key switch 340 integrated with the first member 326 rotates to the stop position as indicated by the broken line in FIG. 8, and the engine is stopped.

  The amplifier 330 boosts the power supply voltage supplied from the tire roller 100 to a predetermined voltage and supplies it to the electric motor 324. The control board 332 includes, for example, a driver circuit that drives the electric motor 324 and operates the electric motor 324 in response to an operation signal from the controller 240.

  The proximity switch 334 is a normally open type switch that detects the first member 326 when the first member 326 is attached to the key switch 340 and conducts between the terminals. When the first member 326 is made of plastic, the proximity switch 334 cannot detect the first member 326, and therefore, for example, a metal plate or the like may be attached to a portion facing the proximity switch 334. In short, at least a part of the first member 326 may be made of metal.

  As an example of use of the proximity switch 334, for example, the rotating lamp 190 attached to the canopy 188 can be operated when the first member 326 is attached to the key switch 340. In this way, the worker 280 working around the tire roller 100 can recognize that the emergency stop device is operating.

  Alternatively, the power supply voltage may be supplied to the magnetic field generator 220 and the controller 240 when the first member 326 is attached to the key switch 340. If it does in this way, since an emergency stop device will start an operation triggered by attachment of the 1st member 326, power consumption can be controlled.

Next, the operation of the emergency stop device will be described.
As shown in FIG. 9, a magnetic field is generated within a predetermined range A behind the tire roller 100 by a pair of left and right magnetic field generators 220. When the worker 280 enters the predetermined range A, the IC tag 260 of the worker 280 transmits radio waves in response to the magnetic field. The radio wave transmitted from the IC tag 260 is received by the antenna 300 attached to the rear part of the tire roller 100, and the output signal is sent to the controller 240. The controller 240 detects radio waves transmitted from the IC tag 260 and outputs an operation signal to the engine stop device 320.

  The engine stop device 320 operates the electric motor 324 in response to the operation signal from the controller 240. When the electric motor 324 is activated, the key switch 340 is rotated to stop the engine as described above. When the engine of the tire roller 100 is stopped, the negative brake is activated to stop the tire roller 100 immediately. For this reason, the safety of the worker 280 working behind the tire roller 100 can be ensured.

  When the engine of the tire roller 100 stops, for example, the operation of an alternator driven by the engine stops, so that the power supply voltage supplied from the tire roller 100 to the engine stop device 320 is cut off. For this reason, the electric motor 324 of the engine stop device 320 can be stopped in conjunction with the engine stop without using a special control circuit or the like.

  On the other hand, when the worker 280 is outside the predetermined range A, the IC tag 260 of the worker 280 does not respond to the magnetic field and does not transmit radio waves. For this reason, the engine stop device 320 of the tire roller 100 does not operate, and the work by the tire roller 100 is continued. Therefore, even if there is an operator 280 around the rear of the tire roller 100 that is not within the predetermined range A, the tire roller 100 does not stop and the work by the tire roller 100 is not affected.

  Since the predetermined range A behind the tire roller 100 is partitioned by the magnetic field generated by the magnetic field generator 220, for example, it is not easily affected by the weather, visibility, temperature, obstacles, and the like, and the reliability for detecting the worker 280 is detected. Is expensive. Further, since the rotating lamp 190, the magnetic field generator 220, the controller 240, the antenna 300, and the engine stop device 320 can be attached and detached without modifying the hydraulic piping of the tire roller 100 and the electrical wiring of the braking device, the rental machine can also be used. It can be retrofitted in a relatively short time.

  The magnetic field generated by the magnetic field generator 220 is not limited to the rear of the tire roller 100 but may be the front in the traveling direction. In this way, the safety of the worker 280 can be ensured even in the range where the operator 200 of the tire roller 100 becomes a blind spot.

  Although the tire roller 100 has been described in the above embodiment, examples of other construction machines include a grader, an asphalt distributor, a cutting machine, a load sweeper, and a wheel loader.

100 tire roller (construction machine)
220 Magnetic Field Generator 240 Controller 260 IC Tag 280 Worker 300 Antenna 320 Engine Stop Device 324 Electric Motor 324A Output Shaft 326 First Member 326B Tip 328 Second Member 328A Base End 328B Tip 334 Proximity Switch 340 Key Switch

Claims (6)

A magnetic field generator installed in a construction machine with a negative brake;
An IC tag worn by an operator working around the construction machine;
A detection device that detects radio waves transmitted from the IC tag in response to a magnetic field generated by the magnetic field generation device;
An engine stop device for stopping the engine of the construction machine when the detection device detects a radio wave;
An emergency stop device for a construction machine, comprising: The engine stop device rotates the rotary key switch to stop the engine.
The emergency stop device for a construction machine according to claim 1. The engine stop device is
An electric motor that operates when the detection device detects radio waves;
A first member having a proximal end detachably attached to the key switch, and a distal end extending outward of the key switch;
A second member having a proximal end fixed to the output shaft of the electric motor and capable of abutting the distal end on the periphery of the first member on a surface perpendicular to the rotation axis of the key switch;
The emergency stop device for a construction machine according to claim 2, comprising: The electric motor is operated by a power source of the construction machine;
The emergency stop device for a construction machine according to claim 3. The first member is at least partially made of metal,
A proximity switch for detecting a metal portion of the first member when the first member is attached to the key switch;
The emergency stop device for a construction machine according to claim 3 or 4, wherein the emergency stop device is used. When an operator wearing an IC tag that emits radio waves in response to the magnetic field enters a magnetic field generated by a magnetic field generator installed in a construction machine equipped with a negative brake, it is transmitted from the IC tag. Detecting the received radio wave, stopping the engine of the construction machine, and urgently stopping the construction machine by the negative brake,
An emergency stop method for a construction machine.