Contact prevention system for construction machine

Abstract

To reduce accidents and damages by automatically stopping a bucket and a boom of a construction machine when the bucket and the boom are detected on a side area, avoiding, in advance, contacts between the construction machine working at a high place on a roadway and vehicles travelling on the roadway, and assisting a worker in determining the risks of the contacts.SOLUTION: A transmission device 10 configured to detect a risk of a contact between a construction machine 2 and a vehicle 4 and transmit a risk notifying signal, includes a determination / control unit 15 configured to: determine whether detection information from a lateral-area sensor 11 configured to detect a risk of contact between the construction machine and the vehicle is a risk notifying signal or not; and control an alarm output unit 16 configured to issue an alarm due to a protrusion-caused contact and a wireless transmitter 19 configured to wirelessly transmit the risk notifying signal. A receiver 30 configured to receive the risk notifying signal includes: a wireless receiver 33 configured to receive the risk notifying signal wirelessly transmitted; an alarm output unit 35 configured to issue the alarm due to the protrusion-caused contact; and a control unit 34 configured to transmit a control signal for avoiding the risk of the contact between the construction machine and the vehicle.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a contact prevention system for construction machinery that prevents contact accidents between construction machinery and vehicles.

Background Art

[0002] Conventionally, in a peripheral monitoring device for a work machine that monitors the state around the work machine as shown in Patent Document 1 by an image displayed on a display device provided in the cab, an image in which a required monitoring range and a mark for emphasizing an obstacle (worker) invading within the monitoring range are drawn on a camera image is displayed on the display device, and an alarm sound is emitted when a worker is detected within the monitoring range of an obstacle detector mounted on an excavator. A peripheral monitoring device is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since this Patent Document 1 is an obstacle detection system that discriminates obstacles based on input images from a plurality of cameras, there is a risk of misrecognition and lighting fixtures may be required in some cases. Furthermore, by simply displaying an input image of a work area set around a construction machine such as a hydraulic excavator on a display device and issuing an alarm when a worker is detected within the monitoring range of an obstacle detector, for example, in the case of an aerial work vehicle often used in maintenance work on structures on highways, there is a risk that the bucket and boom may protrude outside the regulated area during work and come into contact with a vehicle traveling at high speed. It is not fully compatible with such a working environment.

[0005] In view of the above circumstances, the present invention aims to reduce accident damage by automatically stopping the bucket and boom of a construction machine when they are detected in the side area, thereby pre-emptively avoiding contact between the construction machine performing high-altitude work on the road and vehicles passing through, and assisting the judgment of the operator.

Means for Solving the Problem

[0006] To achieve such an object, a first invention is a contact prevention system for a construction machine, comprising a transmission device that detects the risk of contact between a construction machine performing high-altitude work on a roadway and a vehicle passing through the roadway and transmits a danger notification signal, and a reception device that receives the danger notification signal. The transmission device comprises a side area sensor that detects the risk of contact between the construction machine and the vehicle, a determination and control unit that determines that the detection information from the side area sensor indicates a risk of contact and issues an alarm, and sends out control to a wireless transmitter that transmits the danger notification signal by wireless communication. The reception device comprises a wireless receiver that receives the danger notification signal wirelessly transmitted from the transmitter, and a control unit that issues an alarm based on the danger notification signal from the wireless receiver, and sends out control to send a signal for avoiding the risk of contact between the construction machine and the vehicle. It is characterized by this. A second invention is, in the first invention, characterized in that the side area sensor is a laser scanner in which a side area is set by an area distance and an area angle, and can detect the risk of contact with a vehicle. A third invention is, in the first invention or the second invention, characterized in that an alarm lamp and an alarm buzzer are connected to the alarm output unit. A fourth invention is, in the first invention or the second invention, characterized in that the destination for sending the signal for avoiding the risk of contact between the construction machine and the vehicle from the control unit of the reception device is the foot pedal for operating the construction machine. The fifth invention is characterized in that, in the fourth invention, the foot pedal is operable only when start signal confirmations are present for both the transmitting device and the receiving device.

Advantages of the Invention

[0007] According to the present invention, when the bucket and boom of a construction machine are detected on the side area, the bucket and boom automatically stop, pre-emptively avoiding contact between the construction machine performing high-altitude work on the road and vehicles passing by, and assisting the operator's judgment to reduce accident damage.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] As shown in FIG. 1, the present invention is a contact prevention system 1 for a construction machine, which includes a transmitting device 10 that detects the risk of contact between a construction machine 2 on the machine side performing high-altitude work on a roadway and a bucket and boom 3 that are work platforms of a ground-side vehicle 4 passing through the roadway, and transmits a danger notification signal, and a receiving device 20 that receives the danger notification signal. The transmitting device 10 is installed at the tip of a rubber cone 5 so that it can be placed anywhere on the boundary line between the roadway at the construction site and the work area. Specifically, as shown in FIG. 2, the wireless transmitting device 10 is fixed and held by inserting a pipe 6 into a hollow portion 5a obtained by cutting the tip of the rubber cone 5 so that it can be jigged on the outer bottom surface of the box 14 of the transmitting device 10. Furthermore, with appropriate reference to the accompanying drawings, the present invention will be described in detail as a preferred embodiment of a contact prevention system 1 for construction machinery in an aerial work platform as an example of construction machinery.

[0010] [Transmission device] As shown in FIG. 3, the transmission device 10 includes a side area sensor (also referred to as a lidar sensor) 11 that detects the risk of contact between the bucket and boom 3 of the construction machinery 2 and the vehicle 4 (in FIG. 1, a truck is shown as an example), an alarm output unit 16 that determines that the detection information from the side area sensor 11 indicates a risk of contact and issues an alarm, and a determination / control unit 15 that controls the transmission to a wireless transmitter 19 that transmits a danger notification signal by wireless communication. In addition, it includes a power supply unit 22 that supplies power to the side area sensor 11, the alarm output unit 16, the determination / control unit 15, and the wireless transmitter 19. The power supply unit 22 incorporates a rechargeable battery in the box of the transmission device 10.

[0011] The side area sensor 11 is a laser scanner in the infrared region that can detect the risk of contact with a foreign object (the bucket and boom 3 of the aerial work platform 2) by setting a side area B with an area distance X and an area angle α. This side area sensor 11 is a lidar sensor that measures the light reflected from the laser irradiation emitted in a pulse shape and measures and detects the distance to an object at a long distance.

[0012] When the power of the transmission device 10 is turned on, the side area sensor (lidar sensor) 11 of the present embodiment automatically starts up and sets the side area B on the boundary line (also referred to as a regulation line) where contact with the vehicle 4 is to be prevented. For this reason, it is provided on the outer side surface of the box 14 incorporating the transmission device 10 via a blanket 12a (12). As shown in FIG. 3, when the side area sensor (lidar sensor) 11 is attached to the attitude correction unit 13, since the side area sensor (lidar sensor) 11 is not fixed, the attitude correction unit 13 is provided on the outer side surface of the box 14 of the transmission device 10 via a blanket 12b (12).

[0013] When the side area B is set, the side area sensor (lidar sensor) 11 is connected to an external personal computer equipped with software in advance to set the side area B. When the side area B is determined and worked in advance, the software built into the determination / control unit 15 is activated to automatically set parameters, and thus no connection to an external personal computer is made.

[0014] The side area B of the present embodiment is within the range of the area distance X and the area angle α within the lane regulation. That is, it is a fan-shaped area centered on the lidar sensor 11, with the area distance X (corresponding to the radius in the fan shape) set to 5 m and the area angle α (corresponding to the central angle in the fan shape) set to 270 degrees, with the fan standing vertically in the vertical line direction. In the present embodiment, the area distance X (corresponding to the radius in the fan shape) is set to 5 m because the height working vehicle 2 is a single vehicle and the height distance of the bucket and the boom 3 is within 5 m. However, the area distance X can be arbitrarily varied according to the working situation, such as when multiple height working vehicles 2 are arranged in a column for use, the area distance X can be set to 20 m for the side area B.

[0015] Also, when the area distance X is as long as 20 m, even a slight deviation in the central angle will cause a large deviation in the side area B at the 20 m point of the area distance X. For this deviation prevention, the attitude correction unit 13 of the lidar sensor 11 is provided. Although not shown in the figure, this attitude correction unit 13 is adapted to the inclination with two axes for left and right movement and two axes for front and back movement by a gimbal mechanism. That is, the rotatable movement of the bearings of a total of four axes absorbs the attitude inclined left and right and front and back due to vibration and sway, and the movement is corrected so as to be always suspended in the direction of gravity, and is always kept in the vertical direction perpendicular to the vertical direction. In particular, the attitude correction of the bucket and the boom 3 of the height working vehicle 2 protruding into the lane due to left and right lateral sway becomes more important.

[0016] Also, instead of correcting the attitude of the rider sensor 11 itself, the gimbal mechanism may correct the attitude of the box of the transmission device 10 itself by being provided on the outer bottom surface of the box 14 of the transmission device 10. Note that, without using the gimbal mechanism, a pendulum, which is a vertical instrument, may be attached to the side surface of the box 14 of the transmission device 10 to check the attitude.

[0017] Next, a determination and control unit 15 that determines whether the detection information from the side area sensor (rider sensor) 11 is a danger notification signal and controls an alarm output unit 16 that issues a contact alarm and a wireless transmitter 19 that wirelessly transmits a danger notification signal will be described.

[0018] The determination and control unit 15 activates the rider sensor 11 and constantly monitors and controls detection information such as the setting of the side area B. When it is determined that the detection information emitted from the rider sensor 11 is the detection of the bucket and boom 3 of the aerial work platform 2 protruding, it has a function of sending a danger notification signal to the alarm output unit 16 and the wireless transmitter 19.

[0019] The data of the detection information from the rider sensor 11 is configured as a point cloud including the x, y, and z coordinate data of each recorded point. The software of the determination and control unit 15 determines whether the protrusion of the bucket and boom 3 is detected in the side area B. For this purpose, a stationary background with no protrusion is recorded as a point cloud. Next, the data of the detection information of the background with protrusion is analyzed to subtract the background and the point cloud is specified. Thereby, as soon as the point cloud including the point cloud that can be ignored because it is static and belongs to the background and the point cloud of the data of the detection information of the background with protrusion enters, these point clouds are compared and collated to determine that the point cloud has changed, that is, it is determined as a protrusion.

[0020] The alarm output unit 16 is connected to an alarm lamp 17 and an alarm buzzer 18 so as to alarm the danger notification signal by sound and light. The alarm lamp 17 is a patrol lamp rotating light, and the alarm buzzer 18 makes a worker aware of the danger with an intermittent buzzer sound. For this reason, the alarm lamp 17 and the alarm buzzer 18 are provided on the upper surface outside the box 14 of the transmission device 10.

[0021] When the wireless transmitter 19 receives the danger notification signal, it transmits it to the receiving device 30 via the antenna 20. The antenna 20 is a lightweight and omnidirectional antenna and is built into the box 14 of the transmission device 30. For this reason, a non-metallic resin or the like is used for the box 14 of the transmission device 30 so as not to block radio waves. The form of wireless communication is a non-selective station used for specific applications with low power, but it is not limited to this as long as it is a wireless station that does not require a license.

[0022] [Receiving device] The receiving device 30 includes an alarm output unit 35 that issues an alarm based on the danger notification signal from the wireless receiver 33, and a control unit 34 that controls the transmission of a signal for avoiding the contact danger between the construction machine and the vehicle. In addition, it includes a power supply unit 37 that supplies power to the alarm output unit 34 and the wireless transmitter 33. The power supply unit 37 has a rechargeable battery built into the box 31 of the transmission device 30.

[0023] The wireless receiver 33 receives the danger notification signal via the antenna 32. The antenna 32 is a lightweight and omnidirectional antenna and is built into the box 31 of the receiving device 30. For this reason, a non-metallic resin or the like is used for the box 31 of the transmission device 30 so that radio waves are not blocked. The form of wireless communication is a non-selective station used for specific applications with low power, but it is not limited to this as long as it is a wireless station that does not require a license, but it must satisfy the communication standard with the wireless transmitter and be capable of wireless communication.

[0024] The alarm output unit 35 is connected to an alarm lamp 36 and an alarm buzzer 37 so as to alarm a danger notification signal by light and sound. The alarm lamp 36 is a patrol lamp rotating light, and the alarm buzzer 37 emits an intermittent buzzer sound to let the operator perceive the danger. For this reason, the alarm lamp 36 and the alarm buzzer 37 are provided on the upper surface outside the box 31 of the receiving device 30.

[0025] Further, the control unit 34 issues a control signal to the foot pedal 40 to stop the operation of the bucket and the boom 3 of the aerial work vehicle 2 in order to avoid a contact accident by controlling the operation of the alarm lamp 36 and the alarm buzzer 37 from the alarm output unit 35 and the danger notification signal.

[0026] The foot pedal 40 is, in this embodiment, an operating foot pedal installed on the floor of the bucket and the boom 3 of the aerial work vehicle 2. When the foot pedal is not depressed, the bucket and the boom 3 cannot be operated, but when depressed, the operation becomes possible. Thereby, along with the alert of the alarm lamp 36 and the alarm buzzer 37, the operation of the switch of the foot pedal 40 is released. Note that the stop device for avoiding contact between the bucket and the boom 3 of the construction machine 2 and the vehicle 4 by the alarm from the receiving device 30 is not limited to the foot pedal, and may be an emergency safety stop button of the construction machine 2.

[0027] In this embodiment, the transmitting device 10 and the receiving device 30 are each described as one unit at the work site. However, even if there are a plurality of receiving devices 30 for one transmitting device 10 and there are a plurality of aerial work vehicles 2 in the side area B, it does not matter. That is, when any one of the buckets and the booms 3 of the plurality of aerial work vehicles 2 senses a danger signal due to protrusion contact within the side area B, the operation of all the aerial work vehicles 2 is automatically stopped. Thereby, it is possible to prevent in advance a contact accident with the vehicle 4 during all aerial work.

[0028] [Contact prevention system operation for construction machinery] The contact prevention system 1 for construction machinery first, as a preliminary preparation, installs the rubber cone 5 with the transmitter 10 on the boundary line where it is desired to prevent overhanging contact with the bucket and boom 3 of the aerial work platform 2, and installs the receiver 30 on the working floor of the bucket and boom 3 of the aerial work platform 2. Then, the cable from the receiver 30 is electrically interconnected to the switch connector of the foot pedal 40.

[0029] Normally, when the power supply units 22, 37 of the transmitter 10 and the receiver 30 are turned on, the transmitter 10 and the receiver 30 are respectively activated (S1, S1'), and the alarm output units 16, 34 are activated by the automatic control of the control unit 34 to perform a preliminary operation check on the alarm lamps 17, 36 and the alarm buzzers 18, 37.

[0030] However, when the power supply unit 22 of the transmitter 10 and the power supply unit 37 of the receiver 30 are OFF, or when the battery serving as the power supply runs out and there is a malfunction, it is required to prevent accidents such as the bucket and boom 3 of the aerial work platform 2 protruding from the regulation line and not stopping. Therefore, the contact prevention system 1 for construction machinery is equipped with a fail-safe function for such overhang stop.

[0031] The fail-safe function of the contact prevention system 1 for construction machinery will be described with reference to FIG. 4 and Table 1. First, when the receiver 30 is activated (S1'), the control unit 34 sends out a receiver activation signal indicating that the receiver 30 is activated (S21). At this point, the activation signals of both the transmitting and receiving devices are confirmed (S22). If the transmitter 10 has not been activated yet (NO), the alarm lamp 36 of the receiver 30 is blinked to alert the operator. Under such a state, the operation of the foot pedal 40 for operating the bucket and boom 3 of the aerial work platform 2 by the operator is not possible.

[0032] Next, when a worker on the ground activates the transmission device 10 (S1), the control unit 15 sends out a transmission device activation signal indicating that the transmission device 10 has been activated (S21). When this transmission device activation signal is sent out, the control unit 15 sends radio waves from the wireless transmitter 19 via the antenna 20, and the control unit 34 of the receiving device 30 in the activated state senses the radio waves at the antenna 32 and receives them with the wireless receiver 33. At this point, both the activation signals of the transmission device 10 and the receiving device 30 are confirmed (S22). Since the receiving device 30 has been activated (YES), the warning lamp 36 of the receiving device 30 is extinguished (S25) to notify the operator that everything is normal. In such a state, the operator can operate the bucket of the aerial work platform 2 and the foot pedal 40 for operating the boom 3 (S26).

[0033] Table 1 in FIG. 4 is a table that classifies the cases of NO and YES conditions for the activation signal confirmation of the fail-safe function of both the transmitting and receiving devices in (S22). NO is indicated by "×" and YES is indicated by "〇".

[0034] In Case 1, in the signal confirmation of the transmitting and receiving devices, if the transmission device 10 on the ground side is powered off (no activation signal) and the mechanical side of the bucket of the aerial work platform 2 is also powered off (no activation signal), the determination is "×1", which is NO, and the fail-safe function is effective.

[0035] In Case 2, in the signal confirmation of the transmitting and receiving devices, even if the transmission device 10 on the ground side is powered off (no activation signal) and the mechanical side of the bucket of the aerial work platform 2 is powered on (activation signal present), the determination is "×2", which is NO, and the fail-safe function is effective.

[0036] In Case 3, in the signal confirmation of the transmitting and receiving devices, since the transmission device 10 on the ground side is powered on (activation signal present), the rider sensor 11 at the symbol "A" in FIG. 4 is activated. However, if the mechanical side of the bucket of the aerial work platform 2 is powered off (no activation signal), the determination is "×3", which is NO, and the fail-safe function is effective.

[0037] In Case 4, in the signal confirmation of the transmission and reception device, if the transmission device 10 on the ground side is powered on (with a startup signal), the rider sensor 11 at the symbol "A" in FIG. 4 is activated, and the mechanical side of the bucket of the aerial work platform 2 is also powered on (with a startup signal), the determination is "〇" and YES, and this fail-safe function is released and the system waits for the reception of the receiver danger signal (S8).

[0038]

Table 1

[0039] Only in the case of Case 4, the operation by the foot pedal 40 for operating the bucket of the aerial work platform 2 and the boom 3 of the operator is possible (S26), and the process can proceed to the symbol "B" in FIG. 5. Thus, this fail-safe function enables the operation of the foot pedal 40 only when the startup signal confirmations of both the transmission device 10 and the reception device 30 are in an AND state.

[0040] Next, the danger signal detection process (after the symbol "A") in the transmission device 10 of the anti-contact system 1 for construction machinery and the post-detection process of the danger signal (after the symbol "B") in the reception device 30 will be described in detail with reference to the functional block diagram in FIG. 3 and the operation flowchart (S2 to S11) in FIG. 5. When the power of the transmission device 10 is turned on and the transmission device is activated, the rider sensor 11 is activated (S2), and the point cloud in the side area B where there is no vehicle (foreign object) on the boundary line is recorded (S3).

[0041] After the point cloud of the side area B with a vehicle (foreign object) on the boundary line is recorded after the recording of the side area B, information indicating that the bucket and boom 3 may come into contact with the side area B is transmitted to the determination and control unit 15 of the transmission device 10. As a result of comparing with the recorded different point clouds, if it is determined (confirmed) that there is a risk of overhanging contact (S3), based on the control by the transmission of a danger signal from the determination and control unit 15 (S4), a danger signal is transmitted from the alarm output unit 16 (S5), causing the alarm lamp 17 of the transmission device 10 to blink and the alarm buzzer 18 to sound (S6), alerting the surrounding supervisors and workers, and at the same time, a danger signal is transmitted to the wireless receiver 33 of the receiving device 30 via the antenna 20 by wireless communication from the wireless transmitter 19 (S7).

[0042] The wireless receiver 33 (S8) that has received the danger signal via the antenna 32 of the receiving device 30 transmits the received danger signal from the control unit 34 to the alarm output unit 35 (S9). Due to the signal of the alarm output unit 35 (S9), the alarm lamp 36 of the receiving device 30 blinks and the alarm buzzer 37 sounds (S10), alerting the workers on the bucket and boom 3 and sending an operation stop signal to the operation foot pedal 40 on the working floor of the bucket and boom 3 (S11). Thereby, the movement of the bucket and boom 3 of the aerial work vehicle 2 is stopped.

[0043] [Release Button] Furthermore, after the movement of the bucket and boom 3 of the aerial work vehicle 2 stops, when the safety is confirmed by the worker on the bucket, an operation to move away from the side area B is performed while the worker presses the release button 39 of the receiving device 30.

[0044] In this way, when the movements of the bucket of the aerial work vehicle 2 and the boom 3 deviate from the side area B, since the lidar sensor 11 of the transmission device 10 continuously monitors and controls the detection information of the point cloud change in the side area B, the software of the determination and control unit 11 records the static background without overhang of the bucket and the boom 3 as a point cloud, and the point cloud of the detection information data of the background without overhang enters. Immediately, by comparing and collating these point clouds, it is determined that the point clouds are the same, and a control signal for stopping the warning lamp 17 and the warning buzzer 18 of the transmission device 10 is sent to the warning output unit 16 based on the automatic warning output cancellation signal.

[0045] In addition, in this embodiment, when the aerial work vehicle stops when an overhang occurs, the stop state cannot be released unless the release switch is pressed. For example, the determination and control unit 11 of the transmission device 10 is provided with a timer (not shown), and when a predetermined time elapses, a control signal for stopping the warning lamp 17 and the warning buzzer 18 of the transmission device 10 is sent to the warning output unit 16 based on the warning output cancellation signal. It is also possible to adopt such a configuration within the scope of the present invention. Similarly, the control unit 34 of the receiving device 10 is provided with a timer (not shown), and when a predetermined time elapses, a control signal for stopping the warning lamp 36 and the warning buzzer 37 of the receiving device 30 is sent to the warning output unit 35 based on the warning output cancellation signal. It is also possible to adopt such a configuration.

[0046] Also, when safety is confirmed not by the operator on the bucket but by, for example, a work manager on the ground, after the movements of the bucket and the boom 3 of the aerial work vehicle 2 stop, the work manager presses the release button 21 of the transmission device 30, and a release signal is transmitted to the determination and control unit 15 of the transmission device 30, and the recording of the point cloud in the side area B is initialized (reset) and returns to the start-up state. Also, the release signal follows the same path as the danger signal to the receiving device 30. That is, the warning lamp 17 goes out and the warning buzzer 18 stops due to the signal from the warning output unit 16 of the transmission device 10, and the release signal is transmitted by wireless communication via the antenna 20 from the wireless transmitter 19 to the wireless receiver 33 of the receiving device 30.

[0047] In response to this, a release signal is received by the wireless receiver 33 through wireless communication via the antenna 32. As a result, the warning lamp 36 is extinguished and the warning buzzer 37 stops due to the signal from the warning output unit 35 of the receiving device 20, and the operation foot pedal 40 for the work floor of the bucket and boom 3 is released from the stopped state. Thereby, it becomes possible to manually return the bucket and boom 3 of the aerial work platform 2 to a position where they do not protrude.

[0048] In addition, although the regulation of the operation foot pedal 40 in the present embodiment has been described in terms of the operation stop of the bucket and boom 3, by controlling the control foot pedal 40 so that it not only stops but also returns to the original position, when the movement of the bucket and boom 3 of the aerial work platform 2 deviates from the side area B, it can be automatically released. That is, since the determination and control unit 15 activates the rider sensor 11 and continuously monitors and controls the detection information of the point cloud change in the side area B, the software of the determination and control unit 11 records the stationary background with no protrusion of the bucket and boom 3 as a point cloud, and as soon as the point cloud of the detection information data of the background with no protrusion enters, these point clouds are compared and collated, and it can be determined that the point clouds are the same. Then, the warning output unit 16, the wireless transmitter 19 of the transmitting device 10, and the warning output unit 35 of the receiving device 30 and the foot pedal 40 return to the normal working state by the control operation to be released.

[0049] [Other Embodiments] When the operator installs the rubber cone 5 with the transmitting device on the boundary line where it is desired to prevent the bucket and boom 3 of the aerial work platform 2 from protruding, the operator selects a place that seems appropriate visually and arranges it artificially. Therefore, two ranging sensors (rider sensors) (or replaced with a 3D rider sensor) are used in a direction perpendicular to the left and right of the side area B to recognize the environment around the roadway, and the placement location is narrowed down front, back, left, and right with reference to the blinking degree of the warning lamp or warning buzzer, assisting the operator to place the rubber cone 5 at an appropriate position.

Industrial Applicability

[0050] Since the anti-contact system for construction machinery of the present invention can be retrofitted to construction machinery, it is not limited to aerial work platforms on roadways as in this embodiment, and can also be used for other construction machinery to prevent accidents caused by overhanging contact.

Explanation of Signs

[0051] 1 Anti-contact system for construction machinery 2 Aerial work platform 3 Bucket and boom of aerial work platform 4 Vehicle 5 Rubber cone 6 Pipe 10 Transmitter 11 Side area sensor (lidar sensor) 12 Blanket 13 Attitude correction unit 14 Box 15 Judgment and control unit 16 Alarm output unit 17 Alarm lamp 18 Alarm buzzer 19 Wireless transmitter 20 Antenna 21 Release button 22 Power supply unit 30 Receiver 31 Box 32 Antenna 33 Wireless receiver 34 Control unit 35 Alarm output unit 36 Alarm lamp 37 Alarm buzzer 38 Power supply unit 39 Release button 40 Foot pedal B Side area α Area angle X Area distance

Claims

1. A contact prevention system for construction machinery, comprising a transmission device that detects the risk of contact between a construction machine performing high-altitude work on a lane and a vehicle traveling on the lane and transmits a danger notification signal, and a receiving device that receives the danger notification signal, wherein the transmission device comprises a side area sensor that detects the risk of contact between the construction machine and the vehicle, a determination and control unit that determines that the detection information from the side area sensor indicates a risk of contact, outputs an alarm, and controls the transmission to a wireless transmitter that transmits the danger notification signal by wireless communication, and the receiving device comprises a wireless receiver that receives the danger notification signal wirelessly transmitted from the transmitter, and an alarm output unit that outputs an alarm based on the danger notification signal from the wireless receiver, and a control unit that controls the transmission of a signal for avoiding the risk of contact between the construction machine and the vehicle. The contact prevention system for construction machinery is characterized by comprising the above components.

2. The side area sensor according to claim 1, wherein a side area is set by an area distance and an area angle of a regulated area, and the side area sensor is a laser scanner capable of detecting the risk of contact with a vehicle.

3. The contact prevention system for construction machinery according to claim 1 or 2, wherein an alarm lamp and an alarm buzzer are connected to the alarm output unit.

4. The contact prevention system for construction machinery according to claim 1 or 2, wherein the transmission destination of the signal for avoiding the risk of contact between the construction machine and the vehicle from the control unit of the receiving device is a foot pedal for operating the construction machine.

5. The contact prevention system for construction machinery according to claim 4, wherein the foot pedal is operable only when startup signal confirmation is received for both the transmission device and the receiving device.

Images