JP2017061382A - Radio communication system for work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system for a work machine that can stably communicate between a lower travelling body and an upper rotation body.SOLUTION: A radio transmitter 41 and a radio receiver 42 are respectively arranged in the vicinity of a rotation center of the upper rotation body that rotates relative to the lower travelling body. Thus, the radio transmitter 41 and the radio receiver 42 are arranged in a space surrounded by the lower travelling body, the upper rotation body and a rotation circle, whereby the radio transmitter 41 and the radio receiver 42 can communicate to each other in an environment that is hardly subject to an impact of disturbance.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a working machine including a lower traveling body that travels on a plane, such as a mobile crane, and an upper revolving body that is provided with a crane device as a working device and that is rotatable with respect to the lower traveling body. The present invention relates to a wireless communication device.

  2. Description of the Related Art Conventionally, in a work machine provided with a lower traveling body that travels on a flat surface, such as a mobile crane, and an upper revolving body that is provided with a work device and is rotatable with respect to the lower traveling body, the lower traveling body and the upper revolving body Communication is performed in a wired manner via a communication cable and a slip ring (for example, see Patent Document 1).

  Moreover, as a work machine provided with a lower traveling body and an upper swing body, a display unit is installed inside a cab provided on the upper swing body, and a camera is installed on the lower traveling body, and the lower part captured by the camera. An apparatus that displays an image around a traveling body on a display unit in a cab is known. In this work machine, a passenger in the cab can travel with the lower traveling body while confirming an image around the lower traveling body captured by the camera.

  When the image data of the image captured by the camera is transmitted from the lower traveling body to the upper swing body by wire, the characteristic impedance is different between the image data and other signal data, so the slip ring used for transmission of the signal data Requires the use of a dedicated slip ring for transmitting different image data. For this reason, when image data is transmitted from the lower traveling body to the upper swing body by wire, a dedicated slip ring for transmitting the image data is installed, so that the structure becomes complicated and the manufacturing cost increases.

  Therefore, as another method of transmitting image data from the lower traveling body to the upper swing body, a camera connected to a wireless transmitter is installed in the lower traveling body, and a display unit connected to a wireless receiver is installed in the cab. It is considered that the image data of an image that is installed and captured by a camera is transmitted from a wireless transmitter, and the video data received by the wireless receiver is displayed on a display unit.

JP-A-7-277675

  However, when the image data is transmitted from the lower traveling body to the upper swing body by the wireless communication described above, the distance between the wireless transmitter and the wireless receiver varies depending on the turning position of the upper swing body relative to the lower traveling body, Since it is easily affected by disturbance, communication between the wireless transmitter and the wireless receiver may become unstable.

  An object of the present invention is to provide a wireless communication device for a work machine capable of performing stable communication between a lower traveling body and an upper swing body.

  In order to achieve the above object, the present invention comprises a lower traveling body and an upper revolving body that is provided with a working device for performing a predetermined operation and is rotatable with respect to the lower traveling body. A wireless communication device for a work machine that performs wireless communication with a body, comprising: a traveling body side wireless communication device provided in a lower traveling body; and a revolving body side wireless communication device provided in an upper turning body, The traveling body side wireless communication device and the turning body side wireless communication device are respectively disposed in the vicinity of the turning center of the upper turning body that turns with respect to the lower traveling body.

  Thereby, since the traveling body side wireless communication device and the revolving body side wireless communication device are arranged in the space surrounded by the members constituting the lower traveling body and the upper revolving body, the traveling body side wireless communication is less likely to be affected by disturbance. Communication between the communicator and the revolving unit side wireless communicator is performed.

  According to the present invention, since the communication between the traveling body side wireless communication device and the revolving body side wireless communication device can be performed in an environment that is not easily affected by the disturbance, it is stable between the lower traveling body and the upper revolving body. Communication can be performed.

It is a side view of the mobile crane which shows one Embodiment of this invention. It is a schematic block diagram of a back monitoring apparatus. It is a side view for demonstrating the attachment state of a wireless transmitter and a wireless receiver. It is a top view for demonstrating the attachment state of a wireless transmitter and a wireless receiver. It is a top view for demonstrating the attachment state of the radio | wireless transmitter and radio | wireless receiver which show other embodiment of this invention.

  1 to 4 show an embodiment of the present invention.

  As shown in FIG. 1, a mobile crane 1 as a work machine provided with a wireless communication device of the present invention has a lower traveling body 10 for traveling in a general road or work area, and a lower traveling body. And an upper swing body 20 that is pivotable in the horizontal direction.

  The lower traveling body 10 includes wheels 11 provided on both sides in the width direction on the front side and the rear side of the carrier frame extending in the front-rear direction, outriggers 12 provided on both sides in the width direction on the front end portion and the rear end portion of the carrier frame, It has. The lower traveling body 10 travels using the engine as a driving source, and the jack cylinder of the outrigger 12 is driven by hydraulic oil discharged from a hydraulic pump driven by the engine.

  The upper turning body 20 is provided so as to be turnable with respect to the lower traveling body 10 via a ball bearing type or roller bearing type turning circle 30 and is turned in a turning direction by a turning motor driven by hydraulic oil discharged from a hydraulic pump. A turning operation is performed on the lower traveling body 10 so as to be able to be switched.

  The upper swivel body 20 is provided on a swivel base 21 fixed to the swivel circle 30, a crane device 22 as a working device provided on one side in the width direction of the swivel base 21, and provided on the other side in the width direction of the swivel base 21. And a cab 23 for operating the traveling body 10 and operating the crane device 22.

  The crane device 22 includes a telescopic boom 22a that can be raised and lowered with respect to the swivel base 21, and a wire rope 22b that extends from the proximal end side of the telescopic boom 22a toward the distal end side and hangs down from the distal end portion of the telescopic boom 22a. And a winch 22c that winds and unwinds the wire rope 22b, and a hook block 22d that is suspended from the wire rope 22b that is suspended from the distal end of the telescopic boom 22a. The telescopic boom 22a performs the telescopic operation and the hoisting operation by the telescopic cylinder and the hoisting cylinder that are driven by the hydraulic oil discharged from the hydraulic pump. The winch 22c performs a winch winding and unwinding operation by a winch motor that is driven by hydraulic oil discharged from the hydraulic pump.

  The cab 23 is a box having transparent plates arranged on the front, rear, left and right sides, and the upper surface. Inside the cab 23 is a seat on which a passenger sits, a handle for steering the wheels 11, and a crane device 22 are operated. An operation lever, a switch, and the like are arranged.

  In addition, at the turning center of the upper turning body 20 inside the turning circle 30, hydraulic oil is circulated between the upper turning body 20 and the lower traveling body 10 that turn with respect to the lower traveling body 10, and power and A swivel joint 31 for transmitting a signal is provided.

  As shown in FIG. 3, the swivel joint 31 is engaged with the shaft-like spindle 31 a fixed to the member 10 a on the lower traveling body 10 side and the member 20 a on the upper swing body 20 side and rotates together with the upper swing body 20. A cylindrical body 31b, and a slip ring 31c provided on the upper portion of the body 31b.

  Moreover, the mobile crane 1 is provided with the back monitoring apparatus 40 for monitoring the back of the lower traveling body 10 at the time of driving | running | working.

  As shown in FIG. 2, the rear monitoring device 40 is an imaging unit 13 for imaging the rear of the lower traveling unit 10 and a radio as a traveling unit side wireless communication device for transmitting image data captured by the imaging unit 13. Resolution processing is performed using a transmitter 41, a wireless receiver 42 as a revolving unit side wireless communication device for receiving a signal of image data transmitted from the wireless transmitter 41, and image data received by the wireless receiver 42. An image processing controller 43 for performing the display and a display unit 23a for displaying the image data subjected to the resolution processing by the image processing controller 43 are provided.

  The imaging unit 13 is, for example, a video camera provided with a CCD (Charge Coupled Device) as an imaging device, and is provided on the rear side of the lower traveling body 10 and is attached in a direction for imaging the rear of the lower traveling body 10. .

  The display unit 23 a is a display device such as a liquid crystal display or a plasma display, and is attached to a position where a passenger in the cab 23 can visually recognize, for example, an upper portion of an operation panel positioned on the front side in the cab 23.

  The wireless transmitter 41 is provided on the lower traveling body 10 side, and transmits the image data captured by the imaging unit 13. As shown in FIG. 3, the wireless transmitter 41 is attached to a member 10 a on the lower traveling body 10 side, to which the spindle 31 a is fixed, in front of the swivel joint 31.

  The wireless receiver 42 is provided on the upper swing body 20 side and inputs received image data to the image processing controller 43. As shown in FIG. 3, the radio receiver 42 is attached to the outer peripheral portion of the body 31 b of the swivel joint 31 via a bracket 42 a, and together with the body 31 b that rotates by the turning of the upper swing body 20, Rotate around the center of rotation. The wireless receiver 42 faces the wireless transmitter 41 in the vertical direction in a posture in which the mobile crane 1 travels, that is, a posture in which the direction of the upper swing body 20 matches the direction of the lower traveling body 10. .

  Further, a cover for preventing invasion of radio waves that affect communication between the wireless transmitter 41 and the wireless receiver 42 may be provided on the outer peripheral side of the wireless transmitter 41 and the wireless receiver 42.

  The image processing controller 43 includes a CPU, a ROM, a RAM, and the like, performs resolution processing to obtain high-resolution image data using a plurality of image data input via the wireless receiver 42, and directs the display unit 23a. Output.

  The mobile crane 1 configured as described above captures the rear of the lower traveling body 10 by the imaging unit 13 during traveling by the lower traveling body 10, and displays the captured image on the display unit 23a.

  At this time, the image data obtained by imaging with the imaging unit 13 is obtained between the wireless transmitter 41 and the wireless receiver 42 arranged in a space surrounded by the lower traveling body 10, the upper swing body 20, and the swing circle 30. Are input to the image processing controller 43 via wireless communication.

  The image processing controller 43 performs resolution processing using a plurality of image data picked up by the image pickup unit 13, and displays the image data having a high resolution on the display unit 23a.

  Thus, according to the wireless communication device of the work machine of the present embodiment, the wireless transmitter 41 and the wireless receiver 42 are arranged in the vicinity of the turning center of the upper swing body 20 that rotates with respect to the lower traveling body 10. Has been.

  As a result, the wireless transmitter 41 and the wireless receiver 42 are arranged in a space surrounded by the lower traveling body 10, the upper swing body 20, and the swing circle 30, and the wireless transmitter 41 is less susceptible to disturbance. Communication between the lower traveling body 10 and the upper swing body 20 can be performed stably.

  Further, the wireless transmitter 41 and the wireless receiver 42 are disposed on the outer peripheral side of the swivel joint 31.

  Thereby, since the wireless receiver 42 rotates around the turning center of the upper swing body 20 as the body 31b of the swivel joint rotates, wireless transmission is performed regardless of the orientation of the upper swing body 20 with respect to the lower traveling body 10. Since the distance between the aircraft 41 and the wireless receiver 42 does not change significantly, more stable communication can be performed between the lower traveling body 10 and the upper swing body 20.

  Further, the wireless transmitter 41 and the wireless receiver 42 are arranged at positions facing each other in the vertical direction at the turning position of the upper turning body 20 when the lower traveling body 10 is running.

  Accordingly, when the mobile crane 1 in which the rear monitoring device 40 is mainly used is traveled, the distance between the wireless transmitter 41 and the wireless receiver 42 becomes the shortest, and the wireless transmitter 41 and the wireless receiver 42 Since there is nothing in between, the communication state can be further stabilized.

  The image data of the image captured by the imaging unit 13 is transmitted from the wireless transmitter 41, the image data transmitted from the wireless transmitter 41 is received by the wireless receiver 42, and the image data received by the wireless receiver 42 is received. It displays on the display part 23a.

  Thereby, since the image data of the image imaged by the imaging unit 13 can be transmitted from the lower traveling body 10 side to the upper swing body 20 side without passing through the slip ring 31c, it is necessary to provide a slip ring for image transmission. Therefore, it can be easily applied to existing mobile cranes.

  Further, the display unit 23a performs resolution processing using a plurality of image data received by the wireless receiver 42, and displays the image data having a higher resolution.

  As a result, even when an inexpensive camera with a low resolution is used as the imaging unit 13, a high-quality image can be displayed on the display unit 23a, so that the manufacturing cost can be reduced. In addition, when a low-resolution camera is used as the imaging unit 13, the amount of data communication between the wireless transmitter 41 and the wireless receiver 42 can be reduced, thereby preventing a decrease in communication speed due to a high load. It becomes possible to do.

  FIG. 5 shows another embodiment of the present invention.

  The wireless receiver 44 of the rear monitoring apparatus 40 of the present embodiment includes a receiver main body 44a and a plurality of receiving antennas 44b.

  The plurality of receiving antennas 44b are respectively attached to the outer periphery of the body 31b of the swivel joint 31, and are arranged at intervals in the circumferential direction of the body 31b. In FIG. 5, eight receiving antennas 44b are arranged at intervals with a central angle of 45 degrees.

  In the mobile crane 1 configured as described above, any of the plurality of receiving antennas 44b is disposed above the wireless transmitter 41 regardless of the direction of the upper swing body 20 with respect to the lower traveling body 10. Will be located.

  As described above, according to the wireless communication device of the present embodiment, the wireless transmitter 41 and the wireless receiver 44 are placed in the space surrounded by the lower traveling body 10, the upper swing body 20, and the swing circle 30 as in the above embodiment. Since the communication between the wireless transmitter 41 and the wireless receiver 42 can be performed in an environment that is not easily affected by disturbances, it is stable between the lower traveling body 10 and the upper revolving body 20. Communication can be performed.

  Further, the wireless receiver 44 includes a plurality of receiving antennas 44b as communication antennas, and the plurality of receiving antennas 44b are arranged around each other outside the turning center of the upper turning body 20 that turns with respect to the lower traveling body 10. It is arranged at intervals in the direction.

  As a result, regardless of the direction of the upper turning body 20 relative to the lower traveling body 10, any one of the reception antennas 44b can be positioned above the wireless transmitter 41, so that the communication state is more stable. It becomes possible to make it.

  In the above embodiment, the present invention is applied to the mobile crane 1, but the present invention is not limited to this. For example, the present invention can be applied to any work machine including a lower traveling body and an upper turning body such as an aerial work vehicle and an excavator.

  Moreover, although the said embodiment showed what applied the radio | wireless communication apparatus of this invention to the back monitoring apparatus 40, it is not restricted to this. As long as wireless communication is performed between the lower traveling body 10 and the upper swing body 20, the present invention is not limited to transmitting image data, and audio data and control signals may be transmitted.

  Moreover, in the said embodiment, although what transmitted data from the lower traveling body 10 to the upper traveling body 20 was shown, you may make it transmit data from the upper traveling body 20 to the lower traveling body 10. In addition, data may be transmitted and received between the lower traveling body 10 and the upper swing body 20.

  In the above-described embodiment, the wireless communication device according to the present invention is applied to communication during traveling of the mobile crane 1. However, the lower traveling body 10 and the upper swing body 20 during work by the crane device 22 are shown. You may use for communication between.

  Moreover, in the said embodiment, although what applied this invention to the back monitoring apparatus 40 which monitors the back of the mobile crane 1 was shown, it is not restricted to what monitors the back of the mobile crane 1, For example, a mobile type You may apply to the apparatus which monitors the direction which becomes a blind spot from the passenger of the crane 1. FIG.

  DESCRIPTION OF SYMBOLS 1 ... Mobile crane, 10 ... Lower traveling body, 13 ... Imaging part, 20 ... Upper turning body, 22 ... Crane apparatus, 23a ... Display part, 31 ... Swivel joint, 40 ... Backward monitoring apparatus, 41 ... Wireless transmitter, 42 ... wireless receiver, 43 ... image processing controller, 44 ... wireless receiver, 44b ... receiving antenna.

Claims (6)

A working machine that includes a lower traveling body and an upper revolving body that is provided with a working device for performing a predetermined operation and is rotatable with respect to the lower traveling body, and performs wireless communication between the lower traveling body and the upper revolving body. A wireless communication device,
A traveling body side wireless communication device provided in the lower traveling body;
A revolving unit side wireless communication device provided on the upper revolving unit,
The traveling body side wireless communication device and the revolving body side wireless communication device are respectively disposed in the vicinity of the turning center of the upper turning body that turns relative to the lower traveling body. A swivel joint that conveys fluid and transmits electric power and signals between the lower traveling body and the upper revolving body is provided at the turning center of the upper revolving body that turns relative to the lower traveling body,
The wireless communication device for a working machine according to claim 1, wherein the traveling body side wireless communication device and the swing body side wireless communication device are disposed on an outer peripheral side of the swivel joint. The traveling body side wireless communication device and the revolving body side wireless communication device are arranged at positions facing each other in a vertical direction at a turning position of the upper revolving body during traveling by the lower traveling body. A wireless communication device for the work machine described. One of the traveling body side wireless communication device and the swing body side wireless communication device has a plurality of communication antennas,
The work according to claim 1 or 2, wherein the plurality of communication antennas are arranged at intervals in the circumferential direction outside the turning center of the upper turning body that turns relative to the lower traveling body. Mechanical wireless communication device. An imaging unit that is provided in the lower traveling body and images the periphery of the lower traveling body;
A display unit provided on the upper swing body and displaying an image captured by the imaging unit;
The image data of the image captured by the imaging unit is transmitted from the traveling body side wireless communication device, the image data transmitted from the traveling body side wireless communication device is received by the revolving body side wireless communication device, and the image data received by the revolving body side wireless communication device. 5. The wireless communication device for a work machine according to claim 1, further comprising: a captured image display unit that displays the image on a display unit. 6. The wireless communication device for a work machine according to claim 5, wherein the display unit displays image data that has been subjected to resolution processing using a plurality of image data received by the revolving unit side wireless communication device and has been increased in resolution. .

Images