WO2011129604A2

WO2011129604A2 - Automatic 3-phase power cable pulling device equipped with a control unit

Info

Publication number: WO2011129604A2
Application number: PCT/KR2011/002606
Authority: WO
Inventors: 백정선; 김동귀; 김용재
Original assignee: (주)클립이엔지; 대덕전력 주식회사
Priority date: 2010-04-16
Filing date: 2011-04-13
Publication date: 2011-10-20
Also published as: WO2011129604A3

Abstract

The present invention relates to a power cable pulling device for laying a power cable in an underground utility conduit, and more specifically, to an automatic power cable pulling device equipped with a control unit for an automatic control over a power cable pulling speed and a tension to be applied to the power cable. The automatic 3-phase power cable pulling device of the present invention comprises: a frame removably attached to a vehicle deck; three drum decks, including a drum shaft that is rotatably and removably attached to the frame and serves to fix a power cable drum, a control shaft that is positioned in line with the drum shaft and then connected thereto by means of a coupling, and a brake that is connected to the control shaft to provide a braking force thereto; an exit roller for gathering an incoming power cable and measuring the length of the power cable being pulled; a pipe wrench that is connected to the power cable with a wire and winds the wire around a winding drum so as to haul the power cable, and measures a tension of the wire being wound and the number of revolutions of the winding drum; and a control unit that controls the braking force to be applied to the brake and the rotational speed of the wrench, on the basis of the number of revolutions of the winding drum and the tension of the wire having been measured by the wrench and of the traverse length provided from the exit roller.

Description

3-phase distribution cable automatic pulling device with control device

The present invention relates to a distribution cable pulling device for installing a distribution cable in an underground power sphere, and more particularly, three-phase distribution having a control device capable of automatically controlling the pulling speed of the distribution cable and the tension applied to the distribution cable. The automatic cable pulling device.

Underground distribution facilities are superior to processing facilities in terms of social and economic aspects such as stable supply of electric power, improved reliability of supply and beautification of urban environment, and underground distribution facilities are continuously increasing every year.

Underground power spheres are underground structures that are connected by vertical spheres to communicate with the ground. In order to install the distribution cable inside the underground power sphere, it is necessary to move the distribution cable through the vertical sphere from the ground and move it into the underground power sphere. This task is called pulling.

In this case, the distribution cable is installed in the underground power outlet, or in the underground pipeline, a pulling operation is required to pull the distribution cable into the pipeline.

SUMMARY OF THE INVENTION An object of the present invention is to provide a distribution cable pulling device having a control device capable of controlling a driving force of a winch and a braking force connected to a drum to control the tension of an incoming distribution cable in a certain range.

Another object of the present invention is to provide a power distribution cable automatic pulling device having a control device that can reduce the work space and reduce the work force by mounting the pulling device to the vehicle.

Another object of the present invention is to provide a distribution cable pulling device having a control device that records various values of a distribution cable pulling process to facilitate construction quality management.

The present invention for achieving this object is a frame detachably fixed to the loading box of the vehicle; A drum shaft part fixed to a distribution cable drum and rotatably attached to the frame, a control shaft part disposed in line with the drum shaft part and coupled to the drum shaft part, and connected to the control shaft part to provide a braking force; Three drum loading portions including a brake portion; An outlet roller which collects an incoming distribution cable and measures a length of a distribution cable pulled from the drum loaded on the drum loading portion; And a control device for adjusting a braking force of the brake unit.

The present invention provides a pulling device that can measure and control the tension applied to the distribution cable in real time in the distribution cable pulling process, thereby improving the convenience of work and bring about the effect of preventing damage to the distribution cable being constructed.

In addition, the present invention has the effect of facilitating the construction quality management by allowing to record in real time the various values measured in the distribution cable construction process.

1 is a structural diagram schematically showing a structure of an underground power sphere;

Figure 2 is a perspective view showing the structure of a three-phase distribution cable automatic pulling device in an embodiment of the present invention,

3 is a plan view showing the structure of a three-phase distribution cable automatic pulling device according to an embodiment of the present invention,

Figure 4 is a plan view showing the structure of a three-phase distribution cable automatic pulling device according to another embodiment of the present invention,

5 is a view showing a drum shaft portion according to an embodiment of the present invention,

6 is a view showing a drum shaft fixing portion according to an embodiment of the present invention.

7 is a block diagram showing a pipe winch according to an embodiment of the present invention,

8 is a schematic diagram for calculating the tension of the wire,

9 is a block diagram showing a control device according to an embodiment of the present invention;

10 is a graph showing a change in diameter of a distribution cable drum and a pipe winch diameter according to the pulling distance;

11 to 15 are graphs showing current density distributions according to the rotation speeds of stator currents 8.35A, 12A, 16A, 22A, and 29A,

16 to 20 are graphs showing rotor speed (N) -torque (T) characteristics according to the number of revolutions of the stator current 8.35A, 12A, 16A, 22A, and 29A,

21 to 25 are graphs showing the maximum weight of a load that the motor can turn off from the generated torque according to the number of rotor revolutions.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a distribution cable pooling device having a control device according to the present invention. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or an operator. Therefore, the definition of one term should be made based on the contents throughout this specification.

First, the structure of the underground power sphere will be described. Underground power port is a structure installed in the depth of 30 ~ 40m underground, and transmission cable, distribution cable and communication cable are installed inside.

1 is a structural diagram schematically showing the structure of an underground power sphere.

As shown in Figure 1, one side of the underground power sphere 10 is formed with a vertical sphere 20 for connecting the ground and the underground power sphere. Inside the vertical sphere is formed a steel structure 22 that the worker can use like a ladder when entering.

In addition, a multi-layer hanger 12 is provided inside the underground power tool 10 so as to distinguish and install various types of cables (transmission cables, distribution cables, communication cables, and the like). For example, the hanger 12 is formed in a three-layer structure, a transmission cable is installed on the first floor, a distribution cable is installed on the second floor, and a communication cable is installed on the third floor.

In order to install a distribution cable in the underground power sphere 10 having such a structure, a work to enter the distribution cable through the vertical sphere 20 is required, which is called a cable pulling.

The length of one section of the underground power strip (where one section refers to the length of the underground power strip installed between adjacent vertical spheres) ranges from tens of meters to hundreds of meters.

On the other hand, the distribution cable is supplied in a wound state on the drum, because the size of the drum is larger than the diameter of the vertical sphere, it is not possible to enter the underground power sphere in the drum state. In addition, hundreds of meters of power distribution cables, by themselves, are bulky and cannot be transported through a vertical sphere in a wound state.

Therefore, in the state in which the drum is located near the inlet of the vertical sphere 20, the distribution cable is released to perform the operation of entering the underground power sphere 10 through the vertical sphere 20. In the past, this operation is mostly performed. It was done by manpower.

In the conventional cable pulling work method, the work force is arranged on the drum side, and the drums must be released by manually holding the drums. When the cable is pulled into the vertical sphere 20 while releasing the power distribution cables by pure force, the large weight of the power distribution cables The manpower is arranged by vertical floors so that the distribution cable is lowered to the ground of the underground power sphere 10 by the force of the manpower, and the worker is placed inside the underground power sphere to carry out the work by carrying the cable. It was.

However, in this process, the cable was in contact with the vertical sphere inlet or the underground power sphere corner, there was a problem that the outer shell is damaged, if the cable falls rapidly due to its own weight, the worker holding the cable may be injured.

In addition, since the movement of the cable is made by the manpower inside the underground power sphere, there is a problem that the work speed is slow and takes a lot of work time.

In addition, the conventional cable pooling work had to be performed one by one cable, and in the case of three-phase distribution cable work, the same work was repeated three times to perform the three-phase cable pooling work.

Figure 2 is a perspective view showing the structure of a three-phase distribution cable automatic pulling device according to an embodiment of the present invention, Figure 3 is a plan view showing the structure of a three-phase distribution cable automatic pulling device in an embodiment of the present invention, Figure 4 3 is a plan view showing the structure of a three-phase power distribution cable automatic pulling device according to another embodiment of the present invention.

Since a three-phase distribution cable is generally used for a distribution cable, the present invention provides an apparatus capable of automatically pulling three distribution cable drums.

The automatic distribution device for the distribution cable according to the present invention is formed to be mounted on the loading box 200 of the van. This makes it possible to transport and install the distribution cable all in one vehicle, thereby greatly improving the convenience and workability of the process. In addition, the distribution cable automatic pulling device according to the present invention performs the pulling operation in the state that the distribution cable is mounted on the vehicle.

The three-phase distribution cable automatic pulling device according to the present invention is formed in a size corresponding to the loading box 200 of the vehicle frame 100 is formed so that the distribution cable drum (D) can rotate without touching the bottom surface of the loading box (100) ).

The frame 100 is formed to rotatably load three distribution cable drums D. As shown in FIG. 3 for efficient use of space, the three distribution cables are connected to the left side, the right side, and the left side. In a staggered manner. By arranging the distribution cable drum (D) in this form, it is possible to accommodate three stackers in a five-ton vehicle.

However, if the length of the cable is long, the size of the drum is also large, so for large drums should be installed in a vehicle of 7 tons or more, in this case, the drum (D) may be arranged in a line.

When the drums D are arranged to be arranged in a line, it may occur that the drum D having a cable length exceeding 300 m cannot be installed due to the size limitation of the vehicle loading space.

In this case, if the height of the drum D in the center is arranged differently, the interference between the drums D can be prevented. That is, it is possible to install three large drums (D) in the size of the limited storage box by arranging horizontally in a row but vertically arranged in a triangular form (drums are arranged to be shifted from top to bottom).

The distribution cable drum D is fixed to the drum shaft unit 110, and the drum shaft unit 110 is rotatably coupled to the frame 100. In this case, the drum shaft unit 110 is detachably attached to the pair of drum shaft fixing units 120 and is rotatably fixed.

The drum shaft unit 110 is provided with a control shaft unit 130 on the same axis. The control shaft unit 130 and the drum shaft unit 110 are connected to the coupling 135. The coupling 135 is detachably connected by fastening means such as bolts and nuts.

While the drum shaft 110 is detachable with respect to the frame 100, the control shaft 130 is rotatably fixed to the frame 100. The drum shaft unit 110 needs a detachable structure for replacing the distribution cable drum D, but the control shaft unit 130 does not need to.

The control shaft unit 130 is connected to the brake unit 140. Therefore, when the braking force is generated in the brake unit 140, the rotation of the drum shaft unit 110 is slowed down.

The brake unit 140 may use a hydraulic or pneumatic brake in which the friction force is adjusted according to the pressure of the fluid.

For example, a hydraulic disc brake or a hydraulic drum brake can be used. This hydraulic brake is to control the pressure of the fluid to adjust the deceleration force.

The brake unit 140 serves to slow down the falling speed when the distribution cable drops the vertical sphere.

Since the distribution cable falls by gravity in the vertical sphere, it may cause damage to the distribution cable if it is not decelerated and may threaten the safety of the worker. Therefore, the present invention allows the distribution cable to be moved to the vertical sphere at a constant speed using the brake unit 140 described above.

In the three-phase distribution cable automatic pulling device according to the present invention, each distribution cable drum (D) is connected to each brake unit (140). At this time, the three brake units 140 are braked by the control device 700.

The rear end of the frame 100 is provided with exit rollers (105, 105a). The

outlet rollers

105 and 105a serve to collect three distribution cables and to measure the length and speed of the distribution cables to be pulled. Since the distribution cables are conveyed without slipping with respect to the

outlet rollers

105 and 105a, the pulling length and the pulling speed of the distribution cable can be measured by measuring the angular speed and the number of rotations of the outlet rollers at the outlet rollers.

The

exit rollers

105 and 105a are preferably formed to be withdrawn from the rear end of the frame 100. Since the

outlet rollers

105 and 105a finally serve to guide the distribution cable pulled from the drum D, the closer the distribution cable is to the inlet to which the distribution cable is inserted, the more stably the distribution cable can be guided. to be.

The pulling length and the pulling speed measured at the exit roller are transmitted to the control device 700. The control device 700 includes a recorder, and the pulling speed according to the pulling length and the tension applied to the cable (with the description of the pipe winch). Will be described later).

The

exit rollers

105 and 105a collect and pull three distribution cables by a roller arranged in a quadrangular shape. As shown in FIG. 2, the

outlet rollers

105 and 105a are arranged in the cable advancing direction to guide the distribution cable stably. However, in some cases, one outlet roller may be used.

In addition, the distribution cable automatic pulling device according to the present invention may further include a boom 300 that is rotatable in position and adjustable in length, the four-side roller 310 may be provided at the front end of the boom 300. .

The quadrilateral roller 310 is formed to accommodate three distribution cables, and serves to collect three distribution cables.

The boom 300 is used when it is not easy to enter the vehicle to the entrance of the power outlet or the entrance of the pipeline. If the vehicle is not easily accessible, the three cables are pulled by passing through the square roller 310 formed at the tip of the boom 300, and extending the tip of the boom 300 to the inlet of the power outlet or the inlet of the pipeline, Prevent the distribution cable from contacting the ground or other structures to prevent cable damage and ensure smooth pulling.

In addition, it is preferable to include an up roller 107 in front of the distribution cable drum (D). The up roller 107 serves to guide the path of the distribution cable upward so that the cable pulled from the distribution cable drum D does not interfere with other distribution cable drum D or the frame. The illustrated embodiment is provided with both the up roller 107 in the first row and the second row, but in some cases may be provided only in the front row of the distribution cable drum (D), all of the distribution cable drum (D) It may be provided in the front.

In addition, the three-phase distribution cable automatic pulling device according to the present invention preferably further comprises a vehicle winch 400 that can be wound around the communication line or communication line.

In order to pull the distribution cable, the front end of the distribution cable is fixed using a wire or a rope. At this time, the vehicle winch 400 is used to pull the wire or the rope to the pulling device side.

When pulling is progressed and the distribution cable wound around the distribution cable drum (D) is almost released, the end is no longer wound on the drum (D), so it must be held using a separate rope.

That is, the rope is connected to the distal end of the distribution cable, and the tension must be applied so that the distribution cable does not fall on the rope. To this end, the control shaft 130 is preferably provided with a rope drum (500). Since the brake unit 140 is connected to the control shaft 130, it is preferable that the end of the distribution cable does not fall freely by operating the brake unit 140 to control the pulling speed of the distribution cable terminal.

The rope drum 500 may rotate together with the control shaft 130 in a direction in which the rope is released, and may be freely rotatable separately from the control shaft 130 in the direction in which the rope is wound. When the distribution cable pulling operation is completed, the rope should be wound on the rope drum 500 again, in which case it is possible to rotate only the rope drum 500 without unnecessarily rotating the entire control shaft 130.

The rope drum 500 is formed to be connected to the vehicle winch 400 by the connecting means 510 such as a belt or a chain, and can operate the vehicle winch 400 to wind the rope on the rope drum 500. It is desirable to. For this purpose, rather than mounting the vehicle winch 400 to the lower portion of the vehicle as shown in Figure 2 it is preferable to mount the vehicle winch 400 to the frame 100 as shown in Figure 3 or 4, the vehicle winch 400 ) May be detachably mounted.

In the illustrated embodiment, one rope drum 500 is formed and the rope drum 500 is configured to be connected to the control shaft 130, but may be configured in other forms.

For example, a rope drum may be formed separately from the control shaft, and a rope drum may be provided as many as the number of distribution cables. And each of the rope drum is provided with a braking means for manually adjusting the braking force, it may be configured in a way to limit the rotational speed of the rope drum.

5 is a view showing a drum shaft portion according to an embodiment of the present invention.

The drum shaft unit 110 is rotatably coupled to the frame 100 in a state in which the distribution cable drum D is fixed.

The drum shaft unit 110 includes a drum shaft 112 penetrating through the distribution cable drum D, a wedge piece 114 having a tapered shape coupled to one side of the distribution cable drum D, and the distribution cable drum ( A fixing piece 116 is coupled to the other side of the D).

By the way, the fastening means (B) is exposed on both sides of the distribution cable drum (D). Fixing piece 116 is provided with a locking groove 116a corresponding to the fastening means, when the fixing piece 116 is in close contact with the side of the distribution cable drum (D), the fastening means in the locking groove 116a In this position, the fixing piece 116 is fixed to the power distribution cable drum D without slipping.

The wedge piece 114 is inserted into the through hole of the distribution cable drum (D) and serves to match the center of the drum shaft 112 and the center of the distribution cable drum (D).

The wedge piece 114 or the fixing piece 116 is formed to be movable in the longitudinal direction of the drum shaft 112, it can be adjusted to be in close contact or spaced apart from both sides of the distribution cable drum (D), It is possible to fix the distribution cable drum (D).

In addition, a coupling 135 is provided at one end of the drum shaft 112, and a coupling having the same size as the coupling 135 provided in the drum shaft 112 is also provided in the control shaft.

The drum shaft unit 110 and the control shaft unit 130 rotate together by binding the pair of couplings 135 using fastening means such as bolts and nuts. Coupling 135 is provided with a plurality of fastening holes for the binding of the fastening means.

6 is a view showing a drum shaft fixing part according to an embodiment of the present invention.

The drum shaft fixing part 120 is disposed at both sides of the distribution cable drum mounting position.

As shown, the drum shaft fixing portion 120 is divided into the upper cover plate 122 and the lower cover plate 124, has a form surrounding the drum shaft portion (110).

In order to attach and detach the drum shaft unit 110, the upper cover plate 122 of the drum shaft fixing unit 120 is connected to the lower cover plate 124 by a hinge shaft. Therefore, when the upper cover plate 122 is flipped as shown by the dotted line, the drum shaft unit 110 can be separated from the drum shaft fixing unit 120.

7 is a block diagram showing a pipe winch according to an embodiment of the present invention.

Pipeline winch 600 is installed in the power sphere to provide a traction to pull the distribution cable, is connected to the above-described control device.

The pipeline winch 600 includes a driving means 610 for providing a driving force, a winding drum 620 connected to the driving means and winding a wire connected to a distribution cable, and a different height in front of the winding drum. A pair of

rollers

630 and 640 disposed, a load cell 650 for measuring a load applied to the roller 630 close to the winding drum, and a winch control unit 660 for controlling the driving means 610. do.

It is preferable to use a three-phase AC motor as the drive means 610. This is because speed control is easy and advantageous in terms of miniaturization.

The pair of

rollers

630 and 640 may be divided into a first roller 630 installed in close proximity to the winch side and a second roller 640 installed in front of the first roller 630. The roller 640 is installed to have a height similar to that of the bottom surface of the winding drum, and the first roller 630 is preferably installed at a height higher than that of the second roller 640.

The load cell 650 measures the load in the vertical direction applied to the first roller 630, from which the tension applied to the wire can be calculated.

The winch control unit 660 is an automatic mode to control the speed of the three-phase AC motor by the control device, and to control the speed of the three-phase AC motor by a speed control switch provided in the winch control unit. It is desirable to be able to select the manual mode. When the automatic mode is selected, the speed and torque of the driving means are made by the control device 700 to be described later, and the operator who selects the manual mode directly controls the winch control unit 660 to control the rotation speed and torque of the winch. Will be adjusted.

8 is a schematic diagram for calculating the tension of the wire.

The force Fx in the vertical direction measured by the load cell is the sum of the vertical components of the tension T1 acting on the left side of the first roller 630 and the tension T2 acting on the right side of the first roller 630. Therefore, Fx = {T1 * sin (θ1)} + {T2 * sin (θ2)}.

By the way, the magnitude of the tension acting on both sides of the first roller 630 is the same (T1 = T2), the angle in which the tension acts is the gunch drum 620, the first roller 630 and the second roller 640 Since it is determined at the time of installation, the tension T1 of the wire can be calculated from the vertical force Fx measured at the load cell.

9 is a block diagram showing a control device according to an embodiment of the present invention.

The control device 700 provided in the three-phase distribution cable automatic pulling device according to the present invention serves to control the braking force of the brake unit, the driving speed and torque of the pipeline winch. Also, the pulling distance and the pulling speed measured at the exit roller are input, and the pipe winch receives the wire tension.

The control device 700 controls the braking force of the brake unit and the driving speed and torque of the pipeline winch from the information input during the pulling process so that the distribution cable can be pulled within the set speed range and allowable tensile force. Control,

The data input during the progress of the pooling process is recorded and displayed according to the pooling distance.

The control unit 700 and the above-mentioned conduit winch may be connected by wire, and in this case, it is preferable to form the interphone to a control line connecting the control unit 700 and the conduit winch. Since the mobile phone is often impossible to communicate within the underground power zone, the operator on the control device 700 side and the workers inside the power hole are connected to each other by connecting the interphone to the control line connecting the control device 700 and the conduit winch. It is desirable to be able to contact you.

It is preferable that a plurality of interphones can be connected. For example, if the distance between the control device 700 and the pipe winch is 300m, it is possible to connect the intercom at 50m intervals, it is possible to connect a total of six interphones.

In addition, it is desirable to be able to connect the emergency stop switch with the connection of the intercom to the communication line. When there is a risk of damage to the distribution cable or safety accident in the cable pulling process, the operator can press the emergency stop switch to realize a safer working environment. The emergency stop switch connected to the communication line performs the same function as the emergency stop switch 720 provided in the control device to be described later.

To this end, the control apparatus 700 includes a display window 710 for displaying information, a mode selection switch 720 for selecting a manual mode and an automatic mode, a speed adjusting lever 730 for adjusting a pulling speed, It includes a tension force adjustment lever 740 for adjusting the tension force at the time of pulling, and an emergency stop switch 760 that allows the operator to emergency stop the pulling operation.

In addition, it includes a direction selection switch 770 that can adjust the rotation direction (forward rotation and reverse rotation) of the pipe winch.

The display window 610 displays the load of the driving means, the tension applied to the wire (or the load measured by the load cell), the pulling distance, the pulling speed, and the like on the pipe winch, and the information is continuously displayed in a graph according to the pulling distance. It may be displayed.

In addition, the control apparatus 700 includes a recorder (not shown) capable of recording the above information, and the recorder records the tension applied to the wire and the cable pulling speed in real time, and the recording is recorded with time. In addition, it is recorded in the pulling distance unit.

These records can be used as important data to determine the adequacy of the pooling work after the supervisor does not directly observe the construction site, thereby facilitating the construction quality management.

The mode selection switch 720 allows to select the automatic mode and the manual mode. In the automatic mode, when the pooling distance and the depth of the vertical sphere are input, the control device controls the pipe winch and the brake unit to execute the pulling operation. In manual mode, the operator monitors the working condition and operates the speed control lever 730 and the tension force control lever 740 to execute the pulling operation by directly adjusting the pulling speed and tension.

< 실험 결과 ><Experimental Results>

In order to verify the validity of the control device according to the present invention, the mathematical review and simulation test were carried out as follows.

1. 배전케이블 드럼과 관로윈치의 직경 변화 검토1. Examination of diameter change of distribution cable drum and pipeline winch

The drum winding the distribution cable is reduced in diameter as the pulling progresses, and the pipe winch winding the wire is increased in diameter as the wire is wound.

10 is a graph showing the change in diameter of the distribution cable drum and the change in the diameter of the pipeline winch according to the pulling distance. In the graph, Dpk represents the diameter of the drum and Dwi represents the diameter of the pipeline winch.

As shown, the diameter of the distribution cable drum decreases stepwise as the pulling distance increases, and the diameter of the pipeline position increases stepwise as the pulling distance increases.

The reason for the increase or decrease of the staircase is due to the change in the number of windings wound. In the case of distribution cables, this value cannot be ignored because the cable thickness is more than 50 mm, and the wire is small in diameter but narrow in length to several hundred meters. Winding in width greatly increases the number of turns, which is also a value that cannot be ignored.

The results show that the distribution cable is assumed to be in the initial state wound 10 times, it can be seen that the initial diameter is reduced from about 1.4m to 0.5m in the final diameter.

In addition, it can be seen that more than twice the diameter change occurred in the pipeline winch from the initial diameter of 0.11m to the final diameter of 0.23m.

From these results, it can be seen that in controlling the pulling process, the diameter change of the drum and the pipeline winch should be taken into account according to the pulling distance.

2. 관로윈치 모터의 해석2. Analysis of Pipeline Winch Motor

1) 목적1) Purpose

The three-phase distribution cable automatic apparatus according to the present invention is configured to install a guide roller for guiding the path of the three-phase distribution cable, and to connect the pipeline winch and the distribution cable with a wire to pull the distribution cable with the power of the pipeline winch. have.

It is necessary to examine whether the generated torque of the pipeline winch can move the three-phase distribution cable at the same time.

Therefore, the current density and torque analysis of the winch motor was conducted using the two-dimensional magnetic field analysis method by the finite element method.

2) 해석 모델2) analysis model

The pipe winch motor used in the experiment consists of a three-phase induction motor and four poles.The current applied to the stator for the characteristics of the current induced in the secondary conductor and the torque analysis of the motor is 8.35A, 12A, 16A, 22A, 29A. In addition, the rotation speed of the rotor was set to 0 (rpm), 150 (rpm), 450 (rpm), 750 (rpm), 1050 (rpm), 1350 (rpm), 1560 (rpm), 1740 (rpm). Analyze the motor characteristics according to the rotation speed. The number of nodes in the analysis model is 6,586 and the number of elements is 11,963.

Table 1 shows the specifications of the motor used in the analysis.

Table 1

3) 유한요소법에 의한 2차원 자계해석 결과3) Result of 2D magnetic field analysis by finite element method

(1) Current density distribution

Since the induction motor torque is generated by the relationship between the rotor flux generated by the current flowing through the stator coil and the current induced in the secondary conductor, the induced current has a great influence on the torque characteristics.

11 shows the current density distribution according to the rotational speed of the stator current 8.35A, FIG. 12 shows the current density distribution according to the rotational speed of the stator current 12A, and FIG. 13 the current density distribution of the rotational speed of the stator current of 16A. 14 shows a current density distribution according to the rotation speeds of the stator current 22A, and FIG. 15 a current density distribution of the rotation speeds of the stator current 29A.

As can be seen in Figures 11 to 15, it can be seen that the distribution of the current density increases as the rotor speed increases. It can be seen that the current density distribution at the stator currents 8.35 A, 12 A, 16 A, 22 A, and 29 A shows the maximum current density in the rotational speed range of 1050 (rpm) to 1570 (rpm). Therefore, the maximum torque is generated in the rotor speed region where the maximum current density occurs.

(2) Rotor speed (N)-torque (T) characteristics

16 to 20 are graphs showing rotor speed (N) -torque (T) characteristics.

Fig. 16 shows torque characteristics according to the respective revolutions of the stator current 8.35A, Fig. 17 shows torque characteristics according to the angular revolutions of the stator current 12A, and Fig. 18 shows the torque characteristics according to the angular revolutions of the stator current 16A. 19 shows torque characteristics according to the rotational speeds at the stator current 22A, and FIG. 20 shows torque characteristics according to the rotations at the stator current 29A.

From the results shown, the maximum torque of the motor when the stator current is 8.35A is generated at 27.32 (Nm) near the rotor speed of 1570 (rpm) and the maximum torque of the motor when the stator current is 12A, 16A is 1350 42.16 (Nm) and 62.03 (Nm) occur in the vicinity of (rpm), and the maximum torque of the motor when the stator current 22A or 29A is applied is 85.20 (Nm) or 118.27 (Nm) near the rotor rotational speed 1050 (rpm). It was confirmed that each occurrence of the, and the maximum torque for each applied current is generated in the 0.13 ~ 0.42 slip range.

21 to 25 show the maximum weight of a load that the motor can turn off from the generated torque at each rotor revolution. However, the results were calculated on the assumption that the winch drum had a constant diameter of 100 (mm) and there was no reduction gear.

From the results of FIGS. 21 to 25, the weight that the motor itself can turn off in the rotor speed range 1050 (rpm) to 1570 (rpm); slip range: 0.13 to 0.42 is generated. From 55.77 (Kgf) to 241.36 (Kgf), it was confirmed that this result is equivalent to 100 (%) load of three-phase induction motor.

No slip occurs on the contact surface between the distribution cable and the roller, and the ideal rotation of the roller is carried out (without bearing wear or abnormal operation), and the winding of the distribution cable and the winding of the pipeline winch are wound around each distribution cable and wire. Assuming that the mechanism is in close contact, the pulling speed of the distribution cable drum should be taken into account the change in diameter of the drum and pipeline winch.

In addition, the horizontal component required to move the three-phase distribution cable about 300m is mainly occupied by the frictional force with the roller according to the cable load.This means that the amount of deflection of the unit cable due to the compact positioning of the roller arrangement on the pipeline about 1.5m apart. It is calculated to be considerably less than the roller clearance, so that the additional tension due to deflection is not taken into account.

In other words, it is expected that the required horizontal component (tensile force) in the situation considering the various initial conditions and system structures is within the range of about 14 to 562 kgf. Therefore, it can be seen that it is possible to simultaneously move the three-phase cable into the underground power port if a stator current of 29 A or more is input and the rotor speed of the three-phase induction motor is properly adjusted.

Therefore, it can be seen that the simultaneous pulling operation of the 300m long three-phase distribution cable using a small capacity three-phase induction motor.

As described above, the three-phase distribution cable automatic pulling device according to the present invention enables to pull the three distribution cables at the same time, it is possible to monitor and record the construction status in real time. Therefore, it is possible to shorten the work force and working time administered to the pooling work and bring about an effect of reducing construction cost by more than 25%. In addition, in the construction quality management, even if the supervisor does not directly observe the construction site, the construction situation can be easily grasped from the recorded contents, thereby bringing an excellent effect in the construction quality management.

Although embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments and can be modified in various forms, and a person of ordinary skill in the art to which the present invention belongs It will be appreciated that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

A frame detachably fixed to a loading box of the vehicle;

A drum shaft part fixed to a distribution cable drum and rotatably attached to the frame, a control shaft part disposed in line with the drum shaft part and coupled to the drum shaft part, and connected to the control shaft part to provide a braking force; Three drum loading portions including a brake portion;

An outlet roller which collects an incoming distribution cable and measures a length of a distribution cable pulled from the drum loaded on the drum loading portion; And

And a control device for adjusting the braking force of the brake unit.
The pipe winch of claim 1, further comprising: a pipe winch connected to the distribution cable and a wire to wind the wire to the winding drum to pull the distribution cable, and to measure the tension of the wound wire and the rotation speed of the winding drum. ,

The control device may be configured to control the braking force applied to the brake unit and the rotational speed of the conduit winch by receiving the rotational speed of the winding drum and the wire tension measured by the conduit winch, and receiving the feed length from the outlet roller. Three-phase distribution cable automatic pulling device characterized in that.
According to claim 2, The pipe winch is provided with a pair of rollers having different heights in front of the winding drum, so that the roller disposed in close proximity to the winding drum is applied to the vertical load by the wire wound And a load cell configured to measure the load.
4. The automatic pulling device for a three-phase distribution cable according to claim 3, wherein the conduit winch uses a three-phase AC motor as a driving means.
[5] The automatic pulling device for a three-phase distribution cable according to claim 4, wherein the conduit winch further includes a winch control unit for adjusting a speed of the three-phase AC motor.
The speed control switch of claim 5, wherein the winch control unit is configured to control the speed of the three-phase AC motor by the control device, and to control the speed of the three-phase AC motor to the winch control unit. 3-phase distribution cable automatic pulling device, characterized in that the manual mode to be made by means of.
The three-phase distribution cable automatic pulling device of claim 2, wherein the control unit controls the braking force of the brake unit and the rotational speed of the conduit winch so that the wire tension is maintained within a predetermined range.
The apparatus of claim 2, wherein the control device comprises a recorder for recording information input in real time.
The three-phase distribution cable automatic pulling device according to claim 1, wherein the three drum mounting portions are arranged to be shifted left and right, or shifted upward and downward.
The three-phase distribution cable automatic pulling device according to claim 1, further comprising an upward roller for guiding a path of the distribution cable so that the distribution cable drawn out from the distribution cable drum does not interfere with other distribution cable drums.
The drum shaft unit of claim 1, wherein the drum shaft portion penetrates a distribution cable drum, a wedge piece coupled to one side of the distribution cable drum, and a fastening means coupled to the other side of the distribution cable drum and provided in the distribution cable drum. Three-phase distribution cable automatic pulling device characterized in that it comprises a fixing piece having a locking groove corresponding to the.
The three-phase distribution cable automatic pulling device according to claim 11, wherein the wedge piece and the fixing piece are movably coupled in an axial direction of a drum shaft.
The three-phase distribution cable automatic pulling device according to claim 1, wherein the detachable attachment / detachment of the drum shaft portion is made by a drum shaft fixing portion which is formed to be openable and disposed on both sides of the distribution cable drum mounting position.
15. The method of claim 13, wherein the drum shaft fixing portion is formed by partitioning the upper cover plate and the lower cover plate to surround the drum shaft portion, characterized in that the upper cover plate is hinged to the lower cover plate can be opened and closed Phase distribution cable automatic pulling device.
The three-phase distribution cable automatic pulling device according to claim 1, wherein the brake unit is a hydraulic or pneumatic brake in which frictional force is adjusted according to the pressure of the fluid.
The three-phase distribution cable automatic pulling device according to claim 1, wherein the coupling is detachable by a fastening means.
The three-phase distribution cable automatic pulling device according to claim 1, further comprising a vehicle winch capable of winding a communication line or a communication line.
The three-phase distribution cable automatic pulling device according to claim 1, further comprising a rope drum on the control shaft.
19. The three-phase distribution cable automatic pulling device according to claim 18, wherein the rope drum rotates together with a control shaft in a direction in which the rope is unwound and independently in a direction in which the rope is wound.