JPH0326751Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a tension measuring device for underground cable extension (laying) work vehicles.

``Prior art'' In conventional underground cable extension work vehicles, a capstan winch is used as the wire rope hoisting drum, and the support frame of the winch is simply supported fixedly on the loading platform, so the hoisting wire rope is The hoisting tension was measured using a tension meter installed on a wire rope guide pulley installed on a support on the ground.

However, such measurements require space for the tension meter, and it is difficult to correct the tension based on the opening angle of the wire rope hanging on the wire rope guide pulley.

``Problems to be solved by the invention'' This invention measures the vertical load applied to the drum by placing a wire rope hoisting drum close to the wire rope being hoisted from the manhole and correcting it according to the hoisting angle. The purpose is to obtain a tension measuring device that can convert tension into tension.

``Means for Solving the Problems'' The present invention provides a support frame for the hoisting drum in a work vehicle that is equipped with a wire rope take-up drum on the front side of the vehicle loading platform and a wire rope hoist drum on the rear side. The front part of the drum is pivoted to the loading platform side by a horizontal axis in the width direction of the drum, and the frame is formed to be rotatable up and down about the horizontal axis, and the frame is supported by a load measuring device, and the frame is supported by a load measuring device. The measuring device is held slidably adjustable in a direction perpendicular to the horizontal axis, and its adjustment scale is provided on the loading platform side.
The support frame is provided with a tension measuring device for an underground cable extension vehicle, which is provided with a hoisting angle scale for the hoisting wire rope.

``Operation'' Therefore, the wire rope connected to the tip of the underground cable is pulled out from the manhole to the ground, wound several times around the wire rope winding drum, and then wound around the wire rope winding drum. The hoisting angle of the hoisting wire rope toward the hoisting drum is then read by a hoisting angle scale. By slidingly adjusting the load measuring device supporting the hoisting drum in the front-rear direction according to the angle scale, it is possible to correct variations in the hoisting load due to the hoisting angle. That is, if the hoisting angle is vertical or close to horizontal, place the measuring device 7 directly below the center of the hoisting drum 4, and check whether the above angle is horizontal (0 degrees) or vertical (90 degrees).
By moving the measuring device 7 backward, that is, away from the horizontal axis 6 in the width direction as it approaches the middle (45 degrees) between It can be corrected by changes. Since the lifting and lowering of the support frame 5 (lifting and lowering of the load receiver button of the load cell 13) is extremely minute, the fine lifting and lowering of the winding angle scale 10 on the frame 5 is within the range of error.

``Example'' A wire rope winding drum 3 is mounted and supported on the front side of the loading platform 2 of the automobile 1, and a wire rope winding drum 4 such as a capstan winch is installed on the rear side to form an electrical work vehicle. Ru. The hoisting drum 4 is provided on a support frame 5, and the frame 5 is pivoted to a loading platform side machine frame 12 by a horizontal shaft 6 in the width direction of the drum so as to be rotatable up and down. And the load cell 13 installed on the loading platform 2 side
The weight of the support frame 5 is supported by a load measuring device 7 according to the present invention. The load cell 13 is provided with a female screw 15 that is screwed into a forward/reverse rotary screw rod 14 provided perpendicular to the horizontal axis 6, and its position is slidably adjusted along the screw rod 14, and its position adjustment scale 8 is adjusted. It is provided on the loading platform 2 side. Further, on the rear side of the support frame 5, a hoisting angle scale 10 for the hoisting wire rope 9 is provided.
In the figure, 16 indicates a handle for forward and reverse rotation of the screw rod 14, 17 indicates a drive device for the hoisting drum 4, 18 indicates a sprocket provided on the output shaft of the device 17, and 1
Reference numerals 9 and 20 indicate a chain for driving the winding drum 3, 21 indicates a torque limiter, 11 indicates a converted tension meter based on a signal from the load cell 13, 22 indicates a pen recorder, 23
is a rotary encoder, 24 is the same encoder 23
25 is a preset counter.

``Effects'' Since the present invention is constructed as described above, the wire rope hoisting drum can be placed close to the manhole without taking up much space, and the position of the hoisting drum's load measuring device can be adjusted according to the hoisting angle of the hoisting wire rope. The tension in the hoisting wire rope can be corrected and determined from the corrected measured load.

[Brief explanation of the drawing]

Figure 1 is a side view showing the tension measuring device in the proposed underground cable extension vehicle, Figure 2 is a block diagram of the tension conversion measurement means, and Figure 3 is a side view of the underground cable extension vehicle. . 1... Car, 2... Loading platform, 3... Wire rope winding drum, 4... Wire rope hoisting drum,
5...Support frame, 6...Horizontal axis in the drum width direction, 7...
... Load measuring device, 8 ... Adjustment scale, 9 ... Hoisting wire rope, 10 ... Hoisting angle scale.

Claims (1)

[Scope of utility model registration request] In a working vehicle equipped with a wire rope winding drum mounted on the front side of the vehicle loading platform and a wire rope winding drum installed on the rear side, the front part of the support frame of the said hoisting drum is connected to the horizontal axis in the width direction of the drum. The frame is pivoted on the loading platform side and can be rotated up and down about the horizontal axis, and the frame is supported by a load measuring device, and the measuring device is slid in a direction perpendicular to the horizontal axis. A tension measuring device for an underground cable extension work vehicle, which is adjustable and has an adjustment scale on the loading platform side, and a hoisting angle scale for a hoisting wire rope on the support frame.