JPH02131309A - Loop wire drawing device - Google Patents

Abstract

PURPOSE:To correct tensile force while continuing operation of a loop wire drawing device by releasing hydraulic pressure of a shoe chain drum or a capstan drive motor upon application of under or over tensile force onto a wire and operating a spring pressure brake. CONSTITUTION:Tensile force applied onto a wire 49 is detected through a tension gauge and rotation of a shoe chain drum 5, i.e., feeding amount of wire, is measured through a rotary encoder arranged on a sprocket drive mechanism 42. Tensile force of a messenger wire 52 is measured through a tension gauge fixed to a guide roller 46a and take-in amount is measured through a rotary encoder 46b fixed to the guide roller 46a. Upon judgement of droppage of tensile force based on these measurements, hydraulic pressure in the shoe chain drum 5 driving system is released by a required amount and brake is applied to reset the tensile force to a predetermined value. In case of excessive tensile force, brake is applied onto the capstan 6 drive system.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a loop wire drawing device.

(Conventional technology) When installing electric cables in mountainous areas, a loop wiring method is sometimes used to avoid transporting wire extension equipment deep into the mountains. This loop extension method is a method in which the messenger wire is looped back and forth from the base where the line starts to the end point of one line extension section, such as the top of a mountain, and then pulled through.One end of the messenger wire is One end of the wire to be laid is connected to the wire, and the wire is extended by winding the messenger wire. In such a loop wire extending system, the winding of the messenger wire and the feeding of the wire must be performed in accurate synchronization.

The present applicant has filed Japanese Patent Application No. 51-74098 (Japanese Patent Publication No. 56-20765) for a device capable of carrying out loop extension by accurately synchronizing winding of messenger wire and feeding out of electric wire as described above. It was disclosed in The disclosed apparatus will be explained below with reference to FIGS. 4 to 6. 4 and 5, on the machine frame 1 are a commutator motor 2, a servo lifter brake 3, and a gear box 4.
, shoe chain drum 5, and capstan 6 are installed. A sprocket 7 driven by the motor 2 via a gear system (not shown) on the machine frame 1 and a sprocket 8 provided on one end surface of the shoe chain drum 5 are connected by a chain 9. Further, the capstan 6 is also driven by the motor 2 via a gear system (not shown). shoe chain drum 5
, the drive mechanism of the capstan 6 is shown diagrammatically in FIG. First, inside the gear box 4 is an electromagnetic clutch 10.
, 11, large-diameter and small-diameter pinions 13, 14, which are brought into contact with and separated from the output shaft 12 of the motor 2, a first intermediate shaft 15, which is in a meshing relationship with these pinions, large-diameter and small-diameter gears 16 at the shaft ends, 17. A gear 20 that meshes with the small-diameter gear 17 via an intermediate gear 18 and is coaxial with the bevel gear 19 is housed. Although it does not appear in Figures 4 and 5 due to illustration, the 6th
A second intermediate shaft 21 in the figure is provided across the machine frame 1, and has gears 22 and 23 at both ends, and a bevel gear 24 that meshes with the bevel gear 19 at the intermediate portion. ．． Further, the gear 23 has a smaller diameter than the gear 22, and meshes with a gear 27 which is moved into and out of contact with a third intermediate shaft 25 and an electromagnetic clutch 26, which are not shown in FIGS. 4 and 5, like the second intermediate shaft. There is. Further, the third intermediate shaft 25 is provided with a spring pressure brake 28 that is interlocked with the electromagnetic clutch 26 and operates when the clutch is off. A gear 29 on the third intermediate shaft drives the capstan 6 via a gear train 30. The gear 22 is provided with an electromagnetic clutch 32 for a fourth intermediate shaft 31, which is not shown in FIGS. 3 and 5, similarly to each intermediate shaft.
A gear 33 that is moved toward and away from the intermediate shaft is engaged with the intermediate shaft, and a spring pressure brake 34 is also provided on this intermediate shaft.

The spring-pressure brakes 28, 32 described above obtain braking force by spring pressure, and are released by electromagnetic force, and are commercially available.

A gear 35 on the fourth intermediate shaft 31 drives the sprocket 7 via a gear train 36.

In addition, in FIG. 6, 37 indicates a speed adjustment motor.

In the above configuration, each electromagnetic clutch, spring pressure brake, and motor control circuit operate as follows. That is, starting of the motor 2 is possible only when the speed adjustment motor 37 is in the lowest position and only one of the electromagnetic clutches 10 and 11 is engaged. Further, the electromagnetic clutches 26, 32 and spring pressure brakes 28, 34 of each intermediate shaft are configured so that the spring pressure brakes are released when the electromagnetic clutches are engaged, and the spring pressure brakes are activated when the electromagnetic clutches are released. Furthermore, the electromagnetic clutches 11 and 12 can be operated only when the speed adjustment motor 37 is stopped and the electromagnetic clutches 26 and 32 of each intermediate shaft are both released, and they are prevented from being activated at the same time. It is interlocked to ensure that Furthermore, the electromagnetic clutches 26 and 32 of each intermediate shaft can be operated only when the speed adjustment motor 37 is stopped and either one of the electromagnetic clutches 10 and 11 is activated. The gear trains 30, 36, subrockets 7, 4, etc. are selected appropriately so that when the capstan 6 and the shoe chain drum 5 rotate in synchronization, the circumferential speeds of the two are the same. The operation of the loop wire extension device with the above configuration is as follows. First, the messenger wire is fed out to form a folded loop from the end point of the extended wire section, and is wound around the capstan 6, and one of the electromagnetic clutches 10 and 11 and the electromagnetic clutch 26 is energized, and the electromagnetic clutch 32 is deenergized. , starts motor 2. This tensions the messenger wire to a certain required tension. At this point, attach the shoe chain drum 5 to the end of the messenger wire.
Connect the ends of the electric wires hooked to the terminals, and energize the electromagnetic clutch 32.

Then, the shoe chain drum 5 starts rotating in synchronization with the capstan 6, and the wire is fed out accordingly, thereby performing wire extension. Note that the capstan 6 and shoe chain drum 5 can be rotated at either high or low speed depending on which of the electromagnetic clutches 10 and 11 is energized, so an appropriate rotation speed can be selected depending on the load. .

Further, in the disclosed device, the speed adjusting motor 37 of the motor 2 is at the lowest position, and the electromagnetic clutches 10, 1
Motor 2 is activated only when either motor 1 is energized, so no strain is placed on motor 2. Furthermore, when the electromagnetic clutch on the intermediate shaft is deenergized, the spring pressure brake is always in operation, and there is no risk of reverse rotation due to load. In addition, the electromagnetic clutches 11 and 12 on the motor output shaft are
The speed adjustment motor 37 is at the lowest position and can be operated only when the electromagnetic clutches on each intermediate shaft are released, and furthermore, they are interlocked so that they are not energized at the same time, so it is safe. Furthermore, since the electromagnetic clutch on the intermediate shaft can be operated only when the speed adjustment motor 37 is stopped and one of the electromagnetic clutches 10 and 11 is energized, the electromagnetic clutch on the intermediate shaft can be operated by someone who disconnects the electromagnetic clutch. The drive of the capstan 6 and the shoe chain drum 5 can be adjusted so that no tension is applied.

As explained above, the disclosed loop drawing apparatus can perform loop drawing relatively smoothly and favorably. (Problems to be Solved by the Invention) However, since the loop wire extending device disclosed above has each part connected mechanically, it has the disadvantage that the following problems occur when operating for a long time. . In other words, (i) The messenger wire is pulled by a capstan, but due to errors in the diameter of the messenger wire, slippage between the messenger wire and the capstan, etc., the pulling speed of the messenger wire fluctuates, and the tension acting on the wire increases. changes.

In other words, when the speed of the messenger wire becomes smaller than the sending speed of the electric wire, the tension on the electric wire decreases, and in the opposite case, the tension on the electric wire increases. (ii) Once such a situation occurs, it is necessary to stop the operation of the loop wire stretching device and adjust the wire tension. That is, when the wire tension decreases, the capstan 6 is driven to wind the messenger wire while monitoring the wire tension, and the tension is increased to a predetermined value, and when the wire tension increases, the shoe chain drum 5 to send out the wire and lower the wire tension to a predetermined value. As mentioned above, all of the above operations must be carried out with the loop wire drawing device stopped and are manual operations, which has the disadvantage of reducing the efficiency of the wire drawing operation.

The present invention has been made based on the above circumstances, and is capable of automatically adjusting fluctuations in wire tension during wire extension work while the device is in operation, without relying on a pure mechanical system to link the operations of each component of the device. The purpose of this project is to provide a loop wire extension device that can do this. C Structure of the Invention] (Means for Solving the Problems) The loop wire stretching device of the present invention includes a shoe chain drum for sending out an electric wire, and a device paired with the shoe chain drum that reciprocates on a wire extension line to form a loop wire. and a capstan for taking over a messenger wire, the end of which is connected to one end of the electric wire from the shoe chain drum, and the shoe chain drum and the capstan are driven independently when hydraulic pressure is released. The shoe chain drum is provided with a means for detecting the tension of the wire being delivered by the shoe chain drum, and the capstan is provided with a means for detecting the tension of the messenger wire being taken up by the shoe chain drum. The present invention is characterized in that means for releasing the hydraulic pressure of either of the hydraulic motors when a difference occurs between the detection outputs of the two detection means is provided.

(Function) In the loop wire drawing apparatus of the present invention having the above configuration, if the wire tension becomes excessive or insufficient due to any of the causes described above, the hydraulic motor that drives either the shoe chain drum or the capstan is activated. Since the hydraulic pressure is released and the spring-pressure brakes attached thereto are activated, the tension in the wire is corrected while the loop wire extending device continues to operate.

(Embodiment) The same parts as in FIGS. 4 to 6 are given the same reference numerals. FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is a power transmission thereof. FIG. 3 is a block diagram of the mechanism and control system.

In these figures, the shoe chain drum 5 and capstan 6 are driven by a tandem pump unit 41 driven by an electric motor 40. The rotation of the hydraulic motors 41b and 41b2 in this tandem pump unit 41 is controlled by reduction gears shown as 42a and 43a in FIG. The sprocket 7 and capstan 6 are rotated through the sprocket 7 and the capstan 6. The sprocket 7 is connected via a chain 9 to a sprocket 8 which is coaxial with the shoe chain drum 5, and drives the shoe chain drum 5 under chain deceleration shown at 42b in FIG. Note that 40a in the figure indicates a hydraulic pump of the tandem pump unit 40. In addition, each hydraulic motor 41b and 4lb are provided with a spring pressure brake 28 that operates in interlock with the release of the hydraulic pressure.
34 is attached. In addition, 41c in this figure indicates a cooler for hydraulic pressure oil. On the other hand, in FIGS. 1 and 2, a wire guide wheel 44 and a wire guide roller 45 are provided on the upstream side of the capstan 6.
, a wire detection device 46 is provided sequentially from the upstream side, and a wire clamp 47 for gripping the messenger wire when work is stopped is provided on the downstream side. Further, a wire receiving roller 48 is provided above the wire entrance side of the machine frame 1 to guide the wire 49 from the payoff drum 5 (not shown) to the shoe chain drum 5.

On the other hand, a rotary encoder 50 is attached to the sprocket drive mechanism 42, and generates a pulse corresponding to the number of revolutions of the sprocket drive mechanism 42, the sprocket 7, and the shoe drum 5, that is, the length of the wire. There is. Further, the tension acting on the wire being sent out is shown at 51 in FIG. 3, and is measured by a wire tension meter, which is not shown in FIGS. 1 and 2. As a means for this measurement, the shoe chain drum 5 is loosely fitted onto its rotating shaft. It is conceivable to have one end pivotally connected to the machine frame 1 by a vertical axis, provide a stress measuring means such as a load cell at the free end, and determine the tension acting on the electric wire from the force acting on the shoe chain drum 5. In short, the electricity sent out from the shoe chain drum 5! The tension acting on 49 and the length of the sending wire will be constantly monitored. Further, the wire detecting device 46 is provided with a guide roller 46 a which is a guide roller of the wire detecting device and is located above the body of the capstan 6 and the wire guide roller 45 , and the wire detecting device 46 is provided with a guide roller 46 a that is located above the body of the capstan 6 and the wire guide roller 45 . The tension acting on the guide roller 4
The length of the messenger wire 52 is measured by a rotary encoder 46b provided concentrically with the messenger wire 6a. In addition, in FIG. 3, 53 is a bottom handle device, 54 is a wire pay-off drum, 55, 56a, 56b, 57a, 57b, 58
1 and 2 respectively show in order a computing device, an electric control device, a manual controller, and a computer, which will be described later.

Hereinafter, the operation of the loop wire drawing apparatus of the present invention having the above configuration will be explained. First, there is the case of semi-automatic driving. In this case, the calculation device S5 constantly compares the tension acting on the electric wire 49 and its sending length, and the tension acting on the messenger wire 52 and its take-up length, as described on page 8 (i). When the speed of the messenger wire becomes smaller than the sending speed of the electric wire and the tension of the electric wire decreases, the electric control circuit 5
6a, a signal is sent to the hydraulic pump 41a of the shoe chain drum drive system, the hydraulic pressure of the hydraulic motor 41b1 of this system is released as necessary (FIG. 3, 28a), and the spring brake 28 interlocked with this is activated. . As a result, a brake is applied to the shoe chain drum 5, and the tension of the electric wire is restored to a predetermined value.

Conversely, when the messenger wire take-up speed is higher than the wire delivery speed and the wire tension increases, the hydraulic pressure of the hydraulic motor 41b2 of the capstan drive system is released as necessary via the electric control circuit 56b. (34a)L
、． A spring pressure brake 34 interlocked with this is actuated. As a result, a brake is applied to the capstan 6, and the tension in the wire is restored to a predetermined value.

As described above, in the loop wire stretching device of the present invention, if a change in tension occurs in the electric wire during wire drawing, the device will not be able to operate regardless of whether the cause is on the capstan side or the shoe chain side. The wire tension can be restored without stopping the operation. In addition, in the above explanation, the manual controllers 57a and 57b control the electric control circuit 56 according to the state of wire extension.
Since the control conditions for a and 56b must be set from time to time, it is a semi-automatic loop extension device. In order to make this a fully automatic loop wire extension device, a computer 58 is used to input overhead wire information 58a obtained in advance about the rotation speed of the capstan 6, the tension acting on the messenger wire 52, and the wire extension route. The calculation results of this computer are input to the electric control circuits 56a, 56.
All you have to do is have it input to b. In addition, 58b in the figure is a recording and display device of the computer 58, and it is possible to monitor the condition of the electric wire during the wire extension and to verify it after the wire extension. Furthermore, the present invention is not limited to the above embodiments. For example, the above-described device of the present invention may be separated into a capstan system and a shoe chain drum system, and the capstan system may be installed at the end point of the extension track, and the shoe chain drum system may be installed at the starting point to connect the two systems. Once operated, it can also be used as a drawing and stretching device. [Effects of the Invention] In conventional loop wire stretching equipment, the pulling speed of the messenger wire fluctuates due to errors in the diameter of the messenger wire, slippage between the messenger wire and the capstan, etc., and the tension acting on the wire changes. do. In other words, when the speed of the messenger wire becomes smaller than the sending speed of the electric wire, the tension on the electric wire decreases, and in the opposite case, the tension on the electric wire increases. Conventional loop wire extension equipment is like this. In such a situation, it was necessary to stop the operation of the loop wire extension equipment and adjust the wire tension. In other words, when the wire tension decreases, the capstan is driven to wind the messenger wire while monitoring the wire tension, increasing the tension to a predetermined value, and when the wire tension increases, the shoe chain drum is activated. The wire is driven to feed out the wire, and the wire tension is lowered to a predetermined value.

However, in the loop wire extending device of the present invention, it is possible to semi-automatically operate the brake of the capstan or shoe chain drum to maintain the tension acting on the wire at the target value without stopping the operation of the device. Because you can
The workability and efficiency of loop wire extension work can be dramatically improved.

[Brief Description of the Drawings] Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is a front view thereof, Fig. 3 is a block diagram of its power transmission mechanism and control system, and Fig. 4 is a conventional one. Fig. 5 is a front view of the loop wire drawing device, Fig. 5 is a plan view thereof, and Fig. 6 is a schematic diagram showing its operating part. 1... Machine frame 5. Old shoe chain drum 6... Capstan 7, 8... Sprocket 9... Chain 28, 34...
... Spring pressure brake 40 ... Electric motor 40
a... Hydraulic pump of tandem pump unit 40... Tandem pump unit 41 b 41
b2...Hydraulic motor 41c...Cooler 42...Sprocket drive unit 43.
...Capstan drive unit 42a, 43a
...Reduction gear 42b...Chain reduction 41b4.4lb, ...Hydraulic motor 44.
...Wire guide wheel 45...Wire guide roller 45 46...Wire detection device
46a... Guide roller 47... Wire clamp 48... Wire receiving roller 48 49
...Electric wire 50, 46b ...Rotary encoder 52 ...Messenger wire 5
3... Bottom takeoff device 54... Wire payoff drum, 55... Arithmetic device 56a. 56
b...Electric control unit [57a. 57b...
・Manual controller 58... Computer

Claims (1)

[Claims] A shoe chain drum that sends out an electric wire, and a messenger wire that is paired with this shoe chain drum and is stretched in a loop shape by reciprocating on the extension line, and one end of which is connected to one end of the electric wire from the shoe chain drum. The shoe chain drum and the capstan are each independently driven by a hydraulic motor equipped with a spring pressure brake that is activated when the hydraulic pressure is released, and the shoe chain drum is driven by a hydraulic motor equipped with a spring pressure brake that is activated when the hydraulic pressure is released. The capstan is provided with a means for detecting the tension of the electric wire being pulled up, and the capstan is provided with a means for detecting the tension of the messenger wire taken by the capstan, and when a difference occurs between the detection outputs of the two detection means, the hydraulic motor is activated. A loop wire extending device characterized in that a means for releasing any hydraulic pressure is provided.