JPH0529222U - Control unit for underground cable laying unit - Google Patents

Abstract

(57) [Summary] [Purpose] In an underground cable laying unit used for cable laying work, regardless of the type of cable and the depth of the laying position, the feeding speed of the cable by the feeding drive device and the traction speed by the traction device The controller 10 arranges a feeding speed detecting means 11 for detecting the feeding speed of the cable C by the feeding drive device 25 in the vicinity of the feeding drive device 25. At the same time, a traction speed detecting means 12 for detecting the traction speed of the cable C by the traction device 27 is arranged underground. Then, based on the detected speeds of the feeding speed detecting means 11 and the pulling speed detecting means 12, a feeding control means for controlling the operation of the feeding driving device 25 so as to match the feeding speed with the pulling speed is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a control device for an underground cable laying unit used for underground cable laying work.

[0002]

[Prior Art]

 When laying the cable wound on the cable drum (power cable, communication cable, etc.) in the deep underground part, first, the cable feeding work vehicle is placed on the ground above the starting point of the cable laying section. A cable drum is rotatably supported on the body of the cable feeding work vehicle. Further, a feeding drive device for pulling out the cable from the cable drum and further feeding (feeding) it further underground is attached to the vehicle body of the cable feeding work vehicle. On the other hand, a winch (towing device) will be installed underground or above ground at the end of the laying section. The cable can be laid over the entire laying section by operating the feeding drive device and pulling the wire rope attached to the tip of the cable by the winch.

However, in order to smoothly perform such a cable laying operation, it is necessary to match the feeding speed of the cable by the feeding drive device with the pulling speed of the winch. Therefore, conventionally, a traction speed detector for detecting the traction speed has been arranged underground, and the operating speed of the feeding drive device has been set based on the traction speed detected by the traction speed detector.

[0004]

[Problems to be solved by the device]

 However, many of the cables laid in the deep underground are large-diameter type and heavy in weight. When paying out such a cable, the actual pay-out speed corresponds to the set actuating speed by adding to the normal operation of the pay-out drive unit the actuation amount due to the pulling force generated by the weight of the cable. There is a problem that it becomes faster than the feeding speed (set feeding speed). In this case, the cable slackens in the basement more than necessary, and smooth installation work cannot be performed. Furthermore, the degree to which the actual payout speed is “faster” than the set payout speed depends on the type of cable (weight per unit length) and the depth of the laying position. For this reason, the operator must monitor the cable feeding condition near the feeding drive device and adjust the operating speed of the feeding drive device according to the situation, which places a heavy burden on the worker.

The present invention has been made in view of the above problems, and the feeding speed of the cable feeding drive unit and the pulling speed of the pulling unit match regardless of the type of the cable and the depth of the installation position. It is an object of the present invention to provide a control device for an underground cable laying unit that can be operated.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the control device of the present invention, the feeding speed detecting means for detecting the feeding speed of the cable by the feeding drive device is arranged near the feeding drive device, and the pulling speed of the cable by the pulling device is arranged. Tow speed detection means for detecting Further, there is provided feeding control means for controlling the operation of the feeding drive device so as to match the feeding speed with the pulling speed based on the respective detected speeds by the feeding speed detecting means and the pulling speed detecting means.

[0007]

[Action]

 In such a control device, the feeding control means compares the feeding speed detected by the feeding speed detecting means with the towing speed detected by the towing speed detecting means. Then, for example, when the detected feeding speed is faster than the detected towing speed as described above, the operating speed of the feeding drive means is slowed down to detect both detection speeds (that is, the actual feeding speed and the towing speed). To match.

[0008]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, FIG. 2 shows an underground cable laying unit 20 provided with a control device according to the present invention. The underground cable laying unit 20 includes a cable feeding work vehicle 21 arranged on a starting point side manhole M1 formed at a starting point of a cable laying section. A pair of swing arms 23, 23, which can freely swing up and down in the front-back direction of the vehicle body 22, are pivotally mounted on the vehicle body 22 of the cable feeding work vehicle 21. Each swing arm 23 is arranged on each side of the vehicle body 22 (however, only the one arranged on the left side of the vehicle body 22 is shown in the drawing), and extends in parallel with each other. The rotary shaft of the cable drum 24 is rotatably held at the tip ends of the swing arms 23, 23.

Further, a feeding drive device 25 is attached to the rear portion of the vehicle body 22. The feeding drive device 25 includes a pair of belt rollers 25a, 25a facing each other. A cable C is sandwiched between both belt rollers 25a, 25a of the feeding drive device 25. Then, by running the belt rollers 25a, 25a so that the portions facing inward move downward from above, the cable C is pulled out from the cable drum 24 and further toward the underground. It can be sent out. The belt rollers 25a, 25a are driven by operating the feeding hydraulic motors 25b, 25b provided for each belt roller. Further, the control of the rotational speeds of the feeding hydraulic motors 25b, 25b (that is, the traveling speeds of the belt rollers 25a, 25a) is performed by opening the flow rate control valve 25c (see FIG. 1) including an electromagnetic proportional control valve or the like. It is done through control.

A wire rope W is attached to the tip of the cable C fed out in this way, and the wire rope W is arranged on the end-side manhole M2 formed at the end of the cable laying section. By being pulled by the winch 27, the cable C is extended into the waterproof pipe P buried in the cable laying section. The cable C can be rewound on the cable drum 24 by running the belt rollers 25a in the opposite directions.

However, in order to smoothly perform the work of laying the cable C, it is necessary to match the feeding speed of the cable C by the feeding drive device 25 with the pulling speed of the winch 27. Therefore, the underground cable laying unit 20 is provided with the control device 10 configured as shown in FIG.

As shown in FIG. 2, the control device 10 is attached to the feeding speed detector 11 attached to the upper portion of the feeding drive device 25 and the opening portion of the waterproof pipe P in the bottom portion of the starting point side manhole M1. The pulling speed detector 12 and a feeding controller 13 (not shown in FIG. 2) built in the feeding driving device 25.

The feeding speed detector 11 detects the actual feeding speed of the cable C regardless of the traveling speed of the belt rollers 25 a and 25 a in the feeding drive device 25 (the operating speed of the feeding drive device). Then, the detection signal corresponding to the detected feeding speed is output to the feeding controller 13.

The tow speed detector 12 detects the moving speed (hereinafter referred to as the tow speed) of the cable C or the wire rope W which is towed by the winch 27 and moves in the waterproof pipe P. Then, the detection signal corresponding to the detected towing speed is output to the feeding controller 13.

The delivery controller 13 includes a comparison unit 14 and a valve opening degree setting unit 15. The comparison unit 14 compares the detection signals output from the detectors 11 and 12 with each other. When the detected feeding speed is faster than the detected towing speed, a signal indicating that effect (that is, too much feeding) is sent to the valve opening degree setting unit 15. Further, when the detected feeding speed is slower than the detected towing speed, a signal to that effect (that is, insufficient feeding) is sent to the valve opening setting unit 15. When the valve opening degree setting unit 15 receives a signal indicating the excessive feeding, the valve opening setting unit 15 sends a signal to the flow rate control valve 25c to decrease the opening degree in order to reduce the traveling speed of the belt rollers 25a and 25a. When a signal indicating insufficient feeding is received, a signal for increasing the opening is sent to the flow rate control valve 25c in order to increase the traveling speed of the belt rollers 25a, 25a.

Next, control of the underground cable laying unit 20 by the control device 10 configured as described above will be described. When the pulling of the cable C by the winch 27 is started (at this point, the belt rollers 25a, 25a are not running yet), first, the pulling of the cable C is started through the detection of the pulling speed by the pulling speed detector 12. Is detected. The feed-out controller 13 compares the detected pulling speed at the beginning of pulling with the feed-out speed detected by the feed-out speed detector 11 (initially zero), and operates the flow control valve 25c to open it. The opening is increased so that the detected feeding speed matches the detected traction speed. As a result, the belt rollers 25a, 25a automatically start running, and their running speed is also increased to a speed corresponding to the detected traction speed.

When the position of the tip of the cable C reaches a certain depth, the belt rollers 25a and 25a run at a speed faster than the running speed corresponding to the opening of the flow control valve 25c due to the weight of the cable C. , The cable C is paid out at a speed faster than the pulling speed by the winch 27. Therefore, the delivery speed detected by the delivery speed detector 11 is higher than the traction speed detected by the traction speed detector 12. Therefore, the feeding controller 13 reduces the opening degree of the flow rate control valve 25c so that the detected feeding speed matches the detected traction speed. As a result, the traveling speeds of the belt rollers 25a and 25a are automatically reduced, and the feeding speed of the cable C matches the drawing speed of the winch 27.

When the cable C is pulled into the waterproof pipe P to some extent, the pulling speed of the winch 27 may decrease due to the weight of the cable C. At this time as well, the feeding speed detected by the feeding speed detector 11 becomes higher than the towing speed detected by the traction speed detector 12, so the feeding controller 13 reduces the opening degree of the flow rate control valve 25c to change the feeding speed to the traction speed. To match.

Further, when the operation of the winch 27 is stopped, the tow speed detected by the tow speed detector 12 becomes zero. Therefore, the feed controller 13 causes the flow rate so that the let out speed detected by the feed speed detector 11 becomes zero. The control valve 25c is closed. As a result, the traveling of the belt rollers 25a, 25a, that is, the feeding of the cable C is automatically stopped.

[0020]

[Effect of the device]

 As described above, in the control device of the present invention, the actual feeding speed of the cable C is compared with the (actual) pulling speed, and the feeding drive means is controlled so that the actual feeding speed and the pulling speed match. Control operation. For this reason, the operation of the feeding drive device is automatically started and stopped in response to the start and stop of towing by the towing device.Furthermore, during the feeding of the cable, regardless of the type of cable and the depth of the installation position, etc. Instead, the cable is automatically delivered at the delivery speed that matches the pulling speed of the winch. For this reason, it is possible to perform a smooth cable laying work by the underground cable laying unit without the need for the operator's hand.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device according to the present invention.

FIG. 2 is a side view of an underground cable laying unit including the control device.

[Explanation of symbols]

 10 Control device 11 Feeding speed detector 12 Traction speed detector 13 Feeding controller 21 Cable feeding work vehicle 25 Feeding drive device 27 Traction device C cable

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeaki Tokumoto 10-1515 Yamashita, Ryoke, Ageo-shi, Saitama Prefecture Aichi Vehicle Co., Ltd. Ageo Plant (72) Akio Sato 1152 Yamashita, Ageo-shi, Saitama Prefecture No. 10 Aichi Vehicle Co., Ltd. Ageo Factory

Claims (1)

[Scope of utility model registration request] 1. A control device for an underground cable laying unit comprising a feeding drive device for feeding a cable underground from a cable drum or the like, and a towing device for pulling the cable fed by the feeding drive device underground. A feeding speed detecting means arranged in the vicinity of the feeding drive device for detecting a feeding speed of the cable by the feeding drive device, and a towing speed arranged in the underground for detecting a pulling speed of the cable by the towing device. And a feeding control means for controlling the operation of the feeding drive device so that the feeding speed matches the pulling speed based on the detection speeds of the feeding speed detecting means and the pulling speed detecting means. Control device for underground cable laying unit.