JP2014205534A - Fixture of gps antenna for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve stabilization of a receiver sensitivity of a GPS antenna which is installed to a construction machine such as a crane.SOLUTION: A fixture 10, which fixes a GPS antenna 1 to a luffing-jib 3 for performing undulation motion of a crane, is equipped with an attitude maintenance mechanism for maintaining an attitude of the GPS antenna 1 in such a manner that the GPS antenna 1 is always directed upward even if an undulation angle of the luffing-jib 3 is changed. The attitude maintenance mechanism is provided with a fitting part of the GPS antenna 1 on one axial end side thereof, and is equipped with rods 20, 22, which are so supported by the luffing-jib 3 as to be relatively rotatable with respect to the luffing-jib 3 with the middle point in the axial direction as a fulcrum, and a weight 26 fixed to the other axial end sides of the rods 20, 22.

Description

  The present invention relates to a GPS antenna fixture for construction machinery.

  As a crane motion monitoring system, a GPS (Global Positioning System) antenna is attached to the jib and crawler to detect the three-dimensional coordinates of the jib in order to prevent the crane jib from contacting the distribution line. (For example, refer to Patent Document 1).

Japanese Patent No. 4218449

  The jib undulates, whereas the GPS antenna is a directional antenna. Therefore, when the direction of the GPS antenna changes due to the jib undulation, the reception sensitivity of the GPS antenna changes. In particular, when the GPS antenna is installed on the luffing jib, the receiving angle of the GPS antenna changes greatly because the luffing jib undulation angle is large.

  This invention is made | formed in view of the said situation, and makes it a subject to stabilize the receiving sensitivity of the GPS antenna installed in construction machines, such as a crane.

  In order to solve the above-described problems, a GPS antenna mounting tool for construction machinery according to the present invention is a mounting tool for mounting a GPS antenna on a undulating portion that performs a undulating operation of the construction machine, and the undulation of the undulating portion is provided. A posture maintaining mechanism that maintains the posture of the GPS antenna so that the GPS antenna always faces upward even when the angle changes is provided.

  In the GPS antenna mounting tool for the construction machine, the posture maintaining mechanism is provided with a mounting portion of the GPS antenna on one end side in the axial direction, and can be rotated relative to the undulating portion with the middle in the axial direction as a fulcrum. A shaft portion supported by the undulating portion and a weight attached to the other end side in the axial direction of the shaft portion may be provided. The posture maintaining mechanism may include a damper that generates a braking torque with respect to the relative rotation of the shaft portion.

  In the GPS antenna fixture for a construction machine, the construction machine may be a crane. Further, the undulating portion may be a base jib and a luffing jib provided at the tip of the base jib.

  ADVANTAGE OF THE INVENTION According to this invention, the receiving sensitivity of the GPS antenna installed in construction machines, such as a crane, can be stabilized.

It is an elevation view which shows the fixture of the GPS antenna which concerns on one Embodiment. It is a top view which shows the fixture of the GPS antenna which concerns on one Embodiment. It is 2-2 sectional drawing of FIG. It is an elevation view which shows the crawler crane which attached the GPS antenna using the fixture. It is an elevation view which shows the effect | action of the fixture which concerns on one Embodiment. It is an elevation view which shows the effect | action of the fixture which concerns on one Embodiment. It is a figure which shows schematic structure of the crane operation | movement monitoring system which concerns on one Embodiment. It is a functional block diagram of a personal computer. It is a figure which shows the image displayed on a monitor.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is an elevation view showing a fixture 10 of a GPS antenna 1 according to an embodiment, FIG. 2 is a plan view showing the fixture 10, and FIG. 3 is a sectional view taken along the line 2-2 of FIG. 4 is an elevational view showing the crawler crane 2 to which the GPS antenna 1 is attached using the fixture 10. As shown in FIG. 4, the GPS antenna 1 is attached to the leading end of the luffing jib 3 and the back stay 5 at the leading end of the base jib 4.

  As shown in FIGS. 1 to 3, the fixture 10 includes a base frame 12, a pair of bearings 14 and 15 fixed to the base frame 12, and a shaft 16 rotatably supported by the pair of bearings 14 and 15. A block 18 fixed to the shaft 16, a pair of rods 20 and 22 fixed to the block 18, a U-shaped angle 24 fixed to the rod 20, and a weight 26 supported by the rod 22. A bracket 28 fixed to the base frame 12 and a rotary damper 30 fixed to the bracket 28 are provided.

  The base frame 12 is a rectangular parallelepiped steel frame, and the entire bottom is open, and an opening is formed at the center in the width direction of the top. A side plate 12A on one end side in the width direction of the base frame 12 is fixed to a side surface of the luffing jib 3 or a side surface of the backstay 5 with a bolt or the like. The bearing 14 is fixed to the inside of the side plate 12 </ b> A of the base frame 12 with a bolt, and the bearing 15 is fixed to the side plate 12 </ b> B on the other side in the width direction of the base frame 12 with a bolt. The pair of bearings 14 and 15 are arranged to face each other in the width direction of the base frame 12, and both ends of the shaft 16 are inserted into these. A pair of retaining rings 17 are fixed to the shaft 16, and these restrict the movement of the shaft 16 in the axial direction so that the shaft 16 does not come off from the bearings 14 and 15.

  The block 18 is formed in a rectangular parallelepiped shape, and is fixed to the central portion of the shaft 16 in the axial direction. The pair of rods 20 and 22 are arranged coaxially with the block 18 in between so that their axis and the axis of the axis 16 are orthogonal to each other. The rod 20 is fixed to the upper part of the block 18, and an angle 24 is fixed to the tip of the rod 20 with a bolt. The angle 24 is arranged so that the two pieces face each other vertically, the lower piece 24A is fixed to the tip of the rod 20, and the GPS antenna 1 is fixed to the upper piece 24B with a bolt.

  The rod 22 is fixed to the lower portion of the block 18, and a weight 26 is attached to the distal end side of the rod 22. The weight 26 has a configuration in which a plurality of plates with holes in the center are stacked, and the tip end side of the rod 22 is inserted into the hole of the weight 26. A bolt 27 with a washer is fixed to the tip of the rod 22, and a weight 26 is supported by the bolt 27. Here, the weight of the weight 26 is such that the moment around the axis 16 at the mass point of the weight 26 is larger than the moment around the axis 16 at the mass point of the GPS antenna 1, that is, the rods 20 and 22 are vertical. The GPS antenna 1 is set to stop vertically above the weight 26.

  The bracket 28 is fixed to the outside of the side plate 12B of the base frame 12 with bolts. The bracket 28 is formed by forming a rectangular steel plate into a hat shape, and flanges 28A on both sides thereof are fixed to the side plate 12B with bolts. A circular hole is formed in the central portion of the bracket 28, and the rotary damper 30 is inserted into the circular hole, and the flange 30A of the rotary damper 30 is fixed to the bracket 28 with a bolt. Further, the rotary shaft of the rotary damper 30 and the shaft 16 are arranged coaxially and are connected by a shaft coupling 30B.

  The rotary damper 30 is a bidirectional rotary damper that generates a braking torque with respect to bidirectional rotation, and resists the movement of the shaft 16 relative to the base frame 12. Here, the rotary damper 30 suppresses the relative rotation of the shaft 16 with a small torque due to wind force, mechanical vibration or the like, while allowing the relative rotation of the shaft 16 with a large torque due to the undulation of the luffing jib 3 or the base jib 4. .

  5 and 6 are elevation views showing the operation of the fixture 10 according to the present embodiment. As shown in FIG. 5, when the luffing jib 3 and the backstay 5 are horizontal and the base frame 12 is horizontal, the rods 20 and 22 are stopped in a vertical posture, and the GPS antenna 1 is stopped vertically above the weight 26. That is, the receiving part of the GPS antenna 1 faces upward. In this state, the rotation of the shaft 16 with a small torque due to wind force, mechanical vibration, or the like is suppressed by the rotary damper 30, thereby suppressing the vibration of the GPS antenna 1.

  On the other hand, as shown in FIG. 6, when the luffing jib 3 and the backstay 5 are inclined with respect to the horizontal line and the base frame 12 is similarly inclined, the rods 20 and 22 are stopped in a vertical posture, and the GPS antenna 1 is Stops vertically above the weight 26. That is, the receiving part of the GPS antenna 1 faces upward. Here, when a large torque acts on the shaft 16 due to the undulations of the luffing jib 3 and the base jib 4, the rotary damper 30 allows the shaft 16 to rotate relatively. As a result, the base frame 12 rotates about the shaft 16, whereas the shaft 16 does not rotate, and the rods 20, 22 integrated with the shaft 16 stop in a vertical posture. Therefore, even if the luffing jib 3 or the base jib 4 is raised and lowered, and the attitude of the base frame 12 is changed, the GPS antenna 1 is maintained in the upward attitude, and the reception sensitivity of the GPS antenna 1 is favorably maintained.

  FIG. 7 is a diagram illustrating a schematic configuration of a crane operation monitoring system 100 according to an embodiment. As shown in this figure, the crane operation monitoring system 100 is a system that monitors whether the crawler crane 2 including the above-mentioned roughing jib 3 is approaching the high-voltage distribution line 6. The leading end of the roughing jib 3 and the leading end of the base jib 4. The GPS antenna 1 attached to the backstay 5 using the fixture 10, the personal computer 110 installed in the driver's seat of the crawler crane 2, and an alarm device 122 are provided. Here, the pair of GPS antennas 1 is always maintained upward regardless of the undulation angle of the luffing jib 3 or the base jib 4 by the fixture 10, and the reception sensitivity is maintained well.

  FIG. 8 is a functional block diagram of the personal computer 110. As shown in this figure, the personal computer 110 includes a position information receiving unit 112, a position coordinate conversion unit 114, an approach determination unit 116, an alarm control unit 118, and a display control unit 120. The position information receiving unit 112 receives position information from the pair of GPS antennas 1 through a wireless or wired line. And the position coordinate conversion part 114 has memorize | stored the data of the field coordinate system containing the position coordinate of the high voltage distribution line 6, and converts the position information which the position information receiving part 112 received into the position coordinate of a field coordinate system.

  The approach determination unit 116 determines whether or not the distance between the position coordinate converted by the position coordinate conversion unit 114 and the position coordinate of the high-voltage distribution line 6 is within the alarm range. Then, the alarm control unit 118 activates the alarm device 122 when the approach determination unit 116 determines that the distance between the position coordinates of the GPS antenna 1 and the position coordinates of the high-voltage distribution line 6 is within the alarm range.

  As shown in FIG. 9, the display control unit 120 displays on the monitor 111 of the personal computer 110 an image obtained by imaging the position of the leading end of the luffing jib 3, the position of the leading end of the base jib 4, and the position of the high-voltage distribution line 6. The display control unit 120 displays the tip of the arrow at the position of the GPS antenna 1 installed at the tip of the luffing jib 3 and displays a double circle at the position of the GPS antenna 1 installed on the backstay 5. A plurality of lines are displayed at position 6, and the alarm area, warning area, and caution area are displayed with broken lines, lines with different colors, or the like.

  As described above, in the crane motion monitoring system 100 according to the present embodiment, the GPS antenna 1 is installed on the leading end of the luffing jib 3 and the backstay 5 at the leading end of the base jib 4, and the position of the leading end of the luffing jib 3 and the base jib 4 The position of the tip of is detected by GPS. Accordingly, the position of the leading end of the luffing jib 3 and the position of the leading end of the base jib 4 can be detected without requiring a calculation process based on the turning angle of the crawler, the undulation angle of the jib, or the like. Then, by converting the position of the leading end of the luffing jib 3 and the position of the leading end of the base jib 4 detected by GPS into an on-site coordinate system including the position coordinates of the high voltage distribution line 6, the leading end of the luffing jib 3 and the base jib 4 The positional relationship between the tip and the high-voltage distribution line 6 can be confirmed.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof. For example, in each of the above-described embodiments, the crawler crane 2 including the luffing jib 3 has been described as an example, but the present invention can also be applied to a construction machine including other undulations such as an excavator.

  Further, the configuration of the posture maintaining mechanism is not limited to the above-described embodiment. For example, the GPS antenna 1 may be maintained in an upward posture with a spring or a motor.

1 GPS antenna, 2 crawler crane, 3 luffing jib, 4 base jib, 5 backstay, 6 high voltage distribution line, 10 fixture, 12 base frame, 12A, 12B side plate, 14 bearing, 15 bearing, 16 shaft, 17 ring, 18 block 20 rod, 22 rod, 24 angle, 24A lower piece, 24B upper piece, 26 weight, 27 bolt, 28 bracket, 28A flange, 30 rotary damper, 30A flange, 30B shaft coupling, 100 crane operation monitoring system, 110 PC, 111 monitor, 112 position information receiving unit, 114 position coordinate converting unit, 116 approach determining unit, 118 alarm control unit, 120 display control unit, 122 alarm device

Claims (5)

A mounting tool for mounting a GPS antenna on a undulating part that performs a undulating operation of a construction machine,
A GPS antenna mounting tool for a construction machine, comprising a posture maintaining mechanism for maintaining a posture of the GPS antenna so that the GPS antenna always faces upward even when the undulation angle of the undulation portion changes. The posture maintaining mechanism is
A mounting portion for the GPS antenna is provided on one end side in the axial direction, and a shaft portion that is supported by the undulating portion so as to be relatively rotatable with respect to the undulating portion with the middle in the axial direction as a fulcrum,
The weight of the said axial part is attached to the other end side of the axial direction, The attachment tool of the GPS antenna for construction machines of Claim 1.   The GPS antenna mounting tool for a construction machine according to claim 2, wherein the posture maintaining mechanism includes a damper that generates a braking torque with respect to relative rotation of the shaft portion.   The said construction machine is a crane, The fixture of the GPS antenna for construction machines of any one of Claim 1- Claim 3.   The GPS antenna mounting tool for a construction machine according to claim 4, wherein the undulating portion is a base jib and a luffing jib provided at a tip of the base jib.