JPH0439297A - Drum frame for cable stringing - Google Patents

Abstract

PURPOSE:To string a cable to preset tension and maintain stringing to the preset tension by providing a controller which drives an actuator means so that the preset tension memorized in advance may be the same as the detected value of a detecting circuit. CONSTITUTION:A damping torque control circuit 99 basically determines the damping stroke of an actuator means based on a preset value F1 by a tension setting circuit 97 to regulate the stroke of a piston rod. Immediately after damping of a piston rod, the actual tension F2 of a cable is determined from the holding angle theta of a presser roller and load (f) based on a formula f0=f/Zsintheta. Moreover, a difference T of the actual tension value F2 from the preset tension F is also computed and plus or minus of the T, is judged and the operating direction of the actuator and its strokes are determined so that the T may be zero, so as to regulate the stroke of the actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a drum mount for a Gebr overhead line used in cable overhead line work, and more particularly to a drum mount for a cable overhead line used in a cable threading method.

[Prior Art] Various overhead line construction methods have been developed and studied in order to carry out continuous and stable overhead line work for communication cables without causing the communication cables to come into contact with obstacles on the ground.

In a general overhead line construction method, a cable drum is rotatably supported on a drum frame, and a pulley (metal wheel) is installed on a concrete pillar to guide and pass the cable fed out from the cable drum. A cable threading method in which the cable is pulled through by pulling the winch wire connected to the (feeding end) under low tension. After hanging the cable in a folded state on the Metsenger wire, the cable end is passed through these lifting wheels, and the cable tip is integrally connected to the first lifting wheel, and the first lifting wheel is attached to a winch. A hanging metal car (moving metal car) construction method in which the cables are connected to an overhead wire by being pulled by a wire, starting with the leading metal car and moving the rear metal cars in sequence, with the cables supported by each metal car. etc. are known.

[Problems to be Solved by the Invention] When installing overhead wires by adopting the pull-through construction method from the viewpoint of labor saving, the following problems need to be solved.

■In the pull-through method, as the cable overhead line progresses, the total weight of the cable drum, which acts as the pack tension during towing, gradually decreases, and the weight of the cable tentatively installed between the concrete pillars increases relative to the cable drum. Considering that the cable drum acts in the unwinding direction, the cable drum is automatically rotated in the unwinding direction and the dip against the ground obstacle increases, and the cable weight in the span increases at an accelerating rate due to the increased dip. There is a high risk that the cable will come into contact with obstacles.

■Because it is a construction method that passes through a pulley (metal wheel), tension
From the viewpoint of cable flatness, it is necessary to maintain constant tension on the overhead lines.

[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems, and includes a drum shaft that is formed in a shaft hole of a cable drum so that it can be freely inserted and removed, and a drum shaft that is inserted between the shaft hole and the drum shaft. a wedge means provided in the drum frame for applying a wedge force to fix the members; a drum mount formed in a frame shape to pivotally support the drum shaft; and a drum mount provided in the drum mount for braking the drum shaft. A pillow brake means, an actuator means provided on a control lever of the pillow brake means and configured to rotate the control lever in a direction to increase or decrease the braking capacity, a tension detection circuit for detecting the actual tension of the cable when the cable is connected; The cable overhead drum mount includes a controller for driving the actuator means so that the set tension and the detected value of the tension detection circuit become the same.

[Operation] A wedge means is fitted into a gap formed between the drum shaft inserted into the shaft hole of the cable drum and the shaft hole, the size of which varies depending on the type of cable drum, to connect the cable drum and the drum shaft. Fix firmly.

As a result, when the cable drum is rotated in the cable payout direction, the drum shaft rotates integrally with the cable drum relative to the drum mount. When the cable is being installed, the tension detection circuit constantly detects the actual tension of the cable and inputs it to the controller. The controller compares and calculates the input actual tension with a pre-stored set tension. For example, if the actual tension value is lower than the set tension, the controller adjusts the braking capacity of the actuator means based on the difference. It operates in an increasing direction to increase the braking capacity of the pillow brake means. Due to the actuation of this actuator means, the actual tension and the pre-stored set tension become substantially the same. Conversely, when the actual tension of the cable is high, the actuator means is operated in a direction to reduce the braking capacity based on the difference between the actual tension and the set tension, thereby reducing the braking capacity of the pillow brake means. In this manner, the actual tension and the pre-stored set tension become approximately the same due to the actuation of the actuator means. Such detection and comparison calculations are repeated, and within a short time, the actual tension becomes the same as the pre-stored set tension, and the cable overhead line is carried out with a constant pack tension.

Here, the set tension stored in the controller is a value uniquely determined by the type of cable and the allowable limit tension of the cable.

Therefore, by using the above-configured cable overhead drum mount and pulling the cable while adjusting the braking force of the cable drum and applying a constant pack tension to the cable, the drum will be prevented from rotating without permission, and the cable date caused by the cable running away will be prevented. This enables cable overhead lines to be run with stable overhead line tension by preventing an increase in cable tension.

[Embodiments] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

First, the drum shaft will be explained.

Cable drums are formed with standardized drum width, body diameter, and shaft hole depending on the type of cable.

Therefore, normally a drum shaft that matches the diameter of the shaft hole of the cable drum is inserted and the cable drum is pivotally supported on the drum mount to perform cable overhead wiring, but in this way, a drum shaft dedicated to a specific cable drum is prepared. In fact, constructing the drum mount in a structure that allows the use of various drum shafts is itself undesirable from the standpoint of device configuration, cost, and management.

Therefore, in the present invention, as shown in Fig. 1, a tube (1! A drum shaft main body 2 is formed by using a structural carbon steel pipe, etc., with the axial length of the pipe appropriately shorter than the minimum standard cable drum drum width, and shaft members 3 are attached to both ends of the drum shaft main body 2. .4 are attached coaxially and integrally to form the drum shaft 1.

One shaft member 3 is formed with a shaft portion 5 coaxially fitted to the drum shaft main body 2 at one end thereof, and
It is formed with a flange 6 for defining the fitting position 1 of the shaft 5, and the diameter of the other end is reduced in two steps from the flange 6, and the drum is formed from the flange 6 to the other end. It is constructed by sequentially forming a fitting shaft portion 7 and a rotating shaft portion 8.

The other shaft member 4 is made of the same processed material (
It is formed from a round bar) and has a shaft part 9 coaxially fitted into the drum shaft main body 2 on one end side, and a collar part 10 for defining the fitting position 1 of the shaft part 9. Further, a shaft portion 1 having a rectangular cross section is formed on the other end side of the collar portion 10.
1 is formed, and the other end side of the shaft part 11 is reduced in diameter in two stages, and a screw shaft part 12 and a rotating shaft part 13 corresponding to the drum fitting shaft part 7 are formed on the other end side of the shaft part 11. It is constructed by sequentially forming.

By welding between the flanges 6 and 10 and the end surface of the drum shaft body 2, these shaft members 3 and 4 are integrated into the drum shaft body 2, thereby forming an integral drum shaft 1.

A wedge means is attached to the drum shaft 1 constructed in this way for fixing the drum shaft 1 in the shaft hole 14 having a hole size determined according to the standard.

That is, the drum fitting shaft portion 7 of one shaft member 3 has a shaft hole 1.
A first wedge member 15 formed in a shape of a concrete tree and having a diameter gradually reduced toward the fourth side is fixed. This first wedge member 15 has a fitting hole 16 formed at its axis to fit into the drum fitting shaft portion 7, and after fitting, the first wedge member 15
It is fixed to the drum fitting shaft portion by a bottle member 17 that passes through the drum in the radial direction.

The other shaft member 4 is provided with a cylindrical retainer 18 that is screwed onto the threaded shaft portion 12 and movable in the axial direction, and is fitted onto the shaft portion 11 so as to be movable with respect to the shaft portion 11. A sleeve 20 formed with a square hole 19 is provided. Furthermore, a shaft portion 1 is located on the shaft hole 14 side from the sleeve 20.
A second wedge member 22 is provided in the shape of a cone and has a square hole 21 that is movably fitted into the wedge member 1 .

Further, the sleeve 20 and the second wedge member 22 have a flange portion 23.2 with outer circumferential surfaces on opposite ends thereof extending in the radial direction.
4 are formed respectively. As shown in FIG. 2, spring housing portions 25 are formed in each of these collar portions 23 and 24 at intervals in the circumferential direction. A compression coil spring 26 is provided to apply elastic force in both directions between the member 22 and the member 22 .

Further, the end of the sleeve 20 on the rotating shaft 13 side is cut off obliquely at a constant inclination angle, and between the inclined surface 27 and the perpendicular end surface 28 of the cylindrical retainer 18 is the compression coil spring 26. A wedge 29 is attached to move the cylindrical retainer 18 toward the shaft hole 14 against the force.

The wedge 29 is attached to the threaded shaft portion 12 along its longitudinal direction.
The screw shaft portion 1 is formed with a long diameter 30 that fits with the screw shaft portion 1
2 so as to be movable in the radial direction. 31 is fitted to and spans the outer peripheral surfaces of the sleeve 20 and the second wedge member 22, and the sleeve 20 is connected to the second wedge member 22.
This cylindrical connecting member 31 is a cylindrical connecting member for movably guiding the sleeve toward the flange 10 side, and the end of the cylindrical connecting member 31 on the rotating shaft 13 side engages with the flange 23 to connect the sleeve 20. A projection 32 is provided extending radially inward to prevent detachment.

Next, the installation process of the drum shaft 1 constructed as described above will be explained.

First, the cylindrical retainer 18, wedge 29, sleeve 20, and second wedge member 22 are removed, and the drum shaft 1 is inserted from one shaft hole 14111 to the other shaft hole 14 side. At the position where the first wedge member abuts one of the shaft holes 14, the drum shaft 1
Attach the second wedge member, sleeve 20, wedge 29, and cylindrical retainer 18 to the cylindrical retainer 18, move the cylindrical retainer 18 toward the other shaft hole 14, and bring the second wedge member 22 into contact with the other shaft hole 14. After this, the wedge 29 is driven into the inclined surface 27 in the direction in which the wedge force is generated.

In other words, the compression coil spring 26 is bent in the compression direction by the wedge force of the wedge 29, and the accumulated spring force of the compression coil spring 26 directly acts on the shaft hole 14, so that the drum shaft 1 and the cable drum are integrated. Moreover, the alignment action of the first wedge member 15 and the second wedge member 22 allows the drum shaft 1 to rotate without eccentric rotation.

Note that the above 1. The wedge angle of the second wedge member 15.22 is determined in accordance with the maximum and minimum cable drum shaft hole dimensions of the applied cable drum, and the wedge angle of the wedge 29 is also determined by the first wedge member. It is uniquely determined based on the wedge angle of the second wedge member 15.22.

Next, a drum mount using the drum shaft 1 will be explained.

As shown in FIG. 3, the drum mount 33 consists of two side frames 34.
34 are connected to each other by two cross frames 35 and 35 at their front and rear ends to form a rectangular frame shape, and a drum jack 36 is provided upright on each side frame 34. The drum jack 36 includes a cylindrical jack cylinder 37 formed with a feed screw (not shown) on its inner circumferential surface, and is screwed onto the feed screw of the jack cylinder 37 and is connected to the jack cylinder 37. The jack rod 38 is formed to be relatively retractable. This jack cylinder 37 is formed by integrally having a base plate 39 at its base, and integrally having a diagonally downwardly directed stem member 40 at the side thereof. The base plate 39 is welded and fixed to the upper surface of the side frame 34. And at the tip of one jack rod 38,
A bearing portion 41 having the structure shown in FIGS. 1 and 4 is attached to the tip of the other jack rod 38, and a third
A pillow brake means 42 of the structure shown in FIGS. 5 and 6 is installed.

As shown in FIGS. 1 and 4, the bearing portion 41 includes a base 43 formed in a rectangular shape that is integrally attached to the tip of one jack rod 38 by welding, and an outer side surface of the base 43. A bearing frame 44 is attached to the base 43, and a rectangular presser frame 45 is attached to the rear end face of the base 43.The bearing frame 44 has two support frames 45 arranged horizontally at appropriate intervals on the top thereof. A radial bearing 46 is attached. A screw hole 47 is formed downward on the upper surface of the base 43, and the screw hole 47
A knob bolt 48 is screwed into the. The holding frame 45 is formed with a hole into which the threaded portion of the knob bolt 48 is loosely fitted, and a stepped shaft holding part 49 is formed in the portion facing the bearing 46. .

Therefore, in order to rotationally support the drum shaft 1, the knob bolt 48 is loosened, the presser frame 45 is rotated, and the space between the radial bearings 46 is released.
After rotationally supporting the rotating shaft portion 8, the presser frame 45
By rotating the knob bolt 48 to a position on the rotating shaft 8 and tightening the knob bolt 48, the rotating shaft 8 is prevented from coming off.

The pillow brake means 42 is constructed as follows.

As shown in FIGS. 3, 5, and 6, a rectangular base member 50 is welded to the tip of the other jack rod, and is attached to the shaft of the drum shaft 1. Lever support plates 51 are welded and attached to the end faces of the base member 50 in the respective directions. These lever support plates 51 are provided with support shafts 52 extending therebetween at intervals in the vertical direction. A brake lever 5 is attached to these support shafts 52.
Three fulcrum parts are pivotally supported. These brake levers 53 are formed with a brake groove 54 in which the rotating shaft portion 13 is inserted, on the intermediate side in the longitudinal direction. As shown in FIG. 6, a U-shaped notch is formed at the force point of one of the brake levers 53 disposed on the lower side, and a pivot portion 55 is formed in the circumferential direction. A cam 56 formed by changing the lifting height along the cam 56 is interposed. This cam 56 is connected to a rotation shaft 57 provided over the pivot portion 55.
It is integrally attached to the pump by a fixing pin 58, and is configured to change the lifting height as the rotating shaft 57 rotates. As shown in FIGS. 1 and 5, the brake lever 53 is configured to be accommodated within a rectangular frame 59 in a state in which it is engaged with the rotating shaft portion 13. This rectangular frame 59 has short elongated holes 58a formed along the vertical direction in the center of the side plate, and these elongated holes 58a.
The rotation shaft 57 is attached to the shaft a so as to span over it.

That is, the rotation shaft 57 is rotatable with respect to the elongated hole 58a, and the rectangular frame 59 is formed in the elongated hole 58a in order to easily fall over.
It is provided movably along 8a. Also, the above rectangular frame 5
9 is formed in a size that allows rotation with a considerable margin relative to the two brake levers 53. Rectangular frame 5
One (upper) brake lever 5 is mounted on the upper plate 60 constituting the brake lever 9.
A knob bolt 61 for rotating the brake lever 3 toward the other (lower #) brake lever 53 side is threadedly provided. In other words, the knob bolt 61 is in contact with the upper surface of the brake lever 53 of one (upper) brake lever 53 and is screwed together to prevent the rectangular frame 59 from rotating (overturning). The distance between the brake grooves 54 is determined. Further, the lower plate 62 constituting the rectangular frame 59 has the cam 5
A support shaft member 64 having a cone-shaped receiving portion 63 attached to its tip is attached in contact with the cam surface of 6. This support shaft member 64 is attached to pass through the lower plate 64, and a pin member (spring pin, etc.) 65 is attached to the end opposite to the receiver portion 63 so as to pass through it in the radial direction. A spring 26a is provided between the receiver portion 63 and the lower plate 62 to apply an elastic force to bring the receiver portion 63 into contact with the cam surface.

Furthermore, as shown in FIG. 5, the base member 50 has a bearing frame 66 which is provided at a position coaxial with the brake groove 54 and rotatably supports the two radial bearings 46.
As shown in FIG. 6, the rotation shaft 57 is rotated to change the lifting height of the cam 56, and as a result, one of the brake levers is A control lever 67 for driving the brake lever 53 in the direction of increasing or decreasing the braking force relative to the other brake lever 53 is integrally attached. A hydraulic double-acting actuator means 68 is attached to this control lever 67 . The tip of the piston rod 69 of the actuator means 68 is connected to the force point of the control lever 67, and the base end of the cylinder 70 is connected to the force point of the control lever 67.
It is pivotally attached to a bracket fitting 71 attached to the base member 50.

Therefore, by expanding and contracting the actuator means 68 in the braking direction, the distance between the brake groove 54 formed in one brake lever 67 and the brake groove 54 formed in the other brake lever 67 is increased or decreased. The braking torque acting on the drum shaft 1 is increased or decreased, and as a result, the tension of the overhead wire on the cable drum 72 integrated with the drum shaft 1 is increased or decreased.

Next, the tension detector 75 will be explained.

As shown in FIG. 3, a ball 73 is provided at the center of the cross member 35 at the front of the drum mount 33.
A gable 7 is provided at the upper end of the ball 73.
A tension detector 75 is attached to detect the actual tension of 4. A base plate 76 is welded to the upper end of the ball 73, and on one side of the base plate 76,
A base frame 77 formed along the pulling direction of the gameple 74 is vertically attached. The base frame 77 has horizontal frame portions 78 integrally formed at both ends thereof, and a vertical frame 79 integrally formed at the center thereof. Tenth lathes 80 are installed horizontally on the base frame 77 at axially symmetrical positions about the axis of the ball 73, and on the horizontal frame 78°78, the cables 74 are attached at intervals in the horizontal direction. Two 20th-ra 81 are installed vertically.

A second guide roller 81 is attached to the base frame 77.
A 30th la 82 is installed horizontally above and below a position adjacent to the 10th la 82, and a 40th la
-Ra 83 is attached. These 1st to 40th wheels 80° 81, 82, 83 are rotatably supported via bearings on fixed shafts whose base ends are integrally fixed to the base frame 77° horizontal frame 78. In order to prevent each roller from falling off, the fixed shaft is caulked at its tip after the first to fortieth rollers 80, 81, 82.83 are attached.

Detector support frames 84 and 85 are integrally formed on the vertical frame 79 at upper and lower positions thereof and extend in the same direction as the horizontal frame 78. A knob bolt 86 is screwed into the upper detector support frame 84 so as to be movable in the vertical direction, and a load cell 88 configured to detect a compressive load is attached to the tip of the knob bolt 86 via a bracket 87. ing.

A rectangular block 89 is integrally attached to the load input portion of the load cell 88 .

The lower detector support frame 85 is formed with a rectangular opening 90 that allows the block 89 to move up and down and that engages and guides the block 89 so as to prevent rotation of the block 89. The block 89 has a cable 7 attached to its tip when engaged with the opening 90.
A roller frame 91 formed in a downward U-shape when viewed from the pulling direction of the roller 4 is integrally attached, and a press roller 92 is rotatably attached to the roller frame 91. Further, as shown in FIG. 8, the bracket 87 has a base end integrally attached thereto, and a gauge 94 inserted through a hole 90 formed in the upper detector support frame 86 at the tip end. installed. The gauge 94 is formed into a rod shape and has scales 9 at intervals in the axial direction.
5 is formed, and the upper detector support frame 85
The moving position of the pressing roller 92 is adjusted by measuring the amount of movement of the bracket 87 with respect to the upper surface of the holding roller 92.

Therefore, the 20th-ra 81 and the 30th-ra 8 arranged in front and behind
2, the cable 74 is rotatably supported by the tenth lug 80, the knob bolt 86 is adjusted using the gauge 94, and the cable 74 is inserted between the tenth lug and the lug 80. When the cable 74 is bent within the permissible bending ratio range of the cable 74 by the pressing roller 92 and then the cable 74 is connected to the overhead line, the load cell 88 detects the component force in the return direction of the cable 74 during the overhead line.

Next, the controller will be explained.

As shown in FIG. 9, the controller 96 includes a tension setting circuit 97, a tension detection circuit 98, and a braking torque control circuit 9.
It consists of 9. The tension setting circuit 97 is configured to be able to set the catenary tension F1 of the cable 74 according to the type of the cable 74 used for catenary work, and the tension detection circuit 98
is electrically connected to the load cell 88 and is configured to input the load f detected by the load cell 88 to the braking torque control circuit 99. The braking torque control circuit 99 basically determines the braking stroke of the actuator means 68 based on the value F+ set by the tension setting circuit 97 and adjusts the stroke of the piston rod 69. Immediately after the piston rod 69 is braked, the actual tension F2 of the cable is determined from the holding angle θ of the presser roller 92 and the load f based on equation (1). Also, calculate T to the difference between the actual tension value F2 and the set tension F1, and at the same time determine the sign of 8T, determine the operating direction of the actuator and its stroke so that 8T becomes '0'', and calculate the actuator's stroke. The device is configured to provide stroke adjustment.

F2=f/2Sinθ (1) Now, the system and overhead line construction method for the cable 74 of the present invention will be explained.

First, a winch side and a drum side are determined for concrete pillars (not shown) erected at predetermined intervals, a vehicle equipped with a vehicle winch (not shown) is installed on the winch side, and a vehicle equipped with a winch (not shown) is installed on the drum side. The drum mount 33 according to the present invention is installed. Each concrete pillar has a guide roller (not shown) for guiding the cable 74 to the overhead line position.
to be mounted on a pillar. Vehicle winches include winches that take output directly from the axle, winches that take output directly from the vehicle's hydraulic power source, and winches that get drive power from the vehicle's power generator, but the winch can be selected arbitrarily. do.

Next, the winch wire is passed through the guide roller, and the end of the winch wire is connected to the cable drum 72 installed on the drum mount 33.
Connect to the tip of the connector via a swivel, etc. In this state, DC power is applied to the controller 96, and the tension setting circuit 97
Then, while inputting the set tension F+ left on the cable 74 to be used, the vehicle winch is driven in the winding direction to connect the cable 74 to the overhead line. At this time, tension is applied to the cable 74 according to the preset value FI, and the cable drum 72
The overhead wire is started with back tension applied. At this time, the braking torque control circuit 99 executes the control shown in the flowchart of FIG. 10 with respect to the actual tension F2 of the cable 74 detected by the load cell 88. That is, in step 100, the actual tension F2 is subtracted from the set tension F1 to determine whether the set tension F+ and the actual tension F2 are equal. If it is determined that the determination in step 100 is equal, this means that the cable 74 is installed with a tension that does not impair the quality of the cable 74 and makes the span dip appropriate. The tension F2 is converted into a braking torque T to continue good braking of the actuator means 68.

If it is determined in step 100 that the set tension F+ and the actual tension F2 are not equal, the braking torque control circuit 99 subtracts the actual tension F2 from the new set tension F, in step 102, and calculates the actual tension F2 with respect to the set tension F+. but"
Determine whether the value is greater than 0". In other words, the set tension F
If the actual tension F2 with respect to 1 is larger than "O", the actual tension F2 exceeds the tension suitable for the cable overhead line and deteriorates the cable quality, and the actual tension F2
If the actual tension F2 is smaller than 0 due to insufficient tension due to factors such as elongation of the winch wire, etc., the dip of the cable in the span of the concrete column will become larger than necessary. First, in step 102, the braking torque control circuit 99 determines in which case the current overhead line state is. Step 102
If it is determined that the actual tension F2 is excessive with respect to the set tension FI, the braking torque control circuit 99 converts the actual tension F2 and the obtained difference ΔF into braking torque in steps 103 and 104, respectively. Then, by adding or subtracting the difference T from the actual braking torque T, the braking torque T is successively changed and adjusted so that the actual tension of the cable 74 becomes equal to the initial setting tension. In other words, this control works effectively even when the vehicle winch is stopped, preventing the cable drum 72 from rotating freely and preventing the cable 74 from running away. In this way, with the vehicle winch set at a constant tension, the overhead line cable 74 can be connected without being subjected to excessive tension or creating an excessive dip, and the cable 74 can be quickly connected without deteriorating the quality of the cable 74. It becomes possible to carry out overhead wiring in a highly safe and labor-saving manner.

Note that it is naturally possible to line the surfaces of the first and second wedge members 15.22 with urethane or the like to further increase the frictional force, so that the base of the ball 73 can be moved freely relative to the cross member 35. Alternatively, the ball 73 may be attached to the cross member 35, or the base plate 76 may be rotatably attached to the ball 73, so that the direction of the cable 74 can be freely adjusted.

The set tension of the cable 74 used is Fl.
The actual tension F2 is set depending on the diameter and logarithm of the wire accommodated therein, but when the cable 74 is a CCP cable, the actual tension F2 is determined to be between 0 and 100 qrf. In FIG. 3, 105 is a control box for protecting the controller 96 from wind and rain, and in FIG. 6, 106 is a hydraulic motor that supplies pressure oil to the actuator means 68.

[Effects of the Invention] As is clear from the above explanation, the present invention provides the following excellent effects.

(1) The cable drum can be installed on the drum mount without having to rotate completely, and the cable can be wired at a set tension value, and the wire can be maintained at the set tension.

(2) Safe, quick and labor-saving overhead line work can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the drum shaft of the drum mount according to the present invention and its attachment, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a perspective view of the drum mount according to the present invention. FIG. 4 is a side view showing the bearing part, FIG. 5 is a side view of the pillow brake means, FIG. 6 is an enlarged view of the main part of the pillow brake means, and FIGS. 7 and 8 are the main parts of the tension detection means. FIG. 9 is a conceptual diagram showing the system of the drum mount according to the present invention, and FIG. 10 is a flowchart showing the control contents of the controller. In the figure, 1 is a drum shaft, 14 is a shaft hole, 15 is a first wedge member, 22 is a second wedge member, 42 is a pillow brake means, and 6
8 is an actuator means, 72 is a cable drum, 96
is the controller. Patent applicant: Toyo Denki Tsushin Kogyo Co., Ltd. Representative patent attorney: Nobuo Kinutani Figure 10

Claims (1)

[Claims] 1. A drum shaft formed in a shaft hole of a cable drum such that it can be inserted into and removed from the shaft hole, a wedge means that is fitted between the shaft hole and the drum shaft and fixes them by applying a wedge force, and the drum shaft. A drum mount formed in a frame shape to support a shaft, a pillow brake means provided on the drum mount to brake the drum shaft, and a control lever of the pillow brake means provided with a braking capability. actuator means that rotates in the direction of increase/decrease of the tension; a tension detection circuit that detects the actual tension of the cable during overhead contact; A drum mount for a cable overhead line, characterized in that it is equipped with a driving controller.