JP5237709B2 - Cutting device - Google Patents

Description

  The present invention relates to a cutting device for cutting a metal plate that closes a steel pipe used as a main pillar of a steel pipe structure such as a steel tower.

  In a steel pipe structure such as a steel pipe tower, as part of maintenance, the state of the inner surface of the steel pipe (tubing body) constituting the main column of the steel pipe structure is investigated and repaired as necessary. As a method for investigating the inner surface of the steel pipe, for example, an investigation / repair device as disclosed in Patent Documents 1 to 3 is suspended from the upper end of the main pillar inside the steel pipe, and moved up and down by a device such as a winch, Perform by visual inspection. When a rusted portion is found on the inner surface of the steel pipe, repair work is performed such as applying a coating after removing rust by performing arc discharge with a repair device. When such an investigation / repair device is used, there is an advantage that the inner surface of the main column can be investigated and repaired without damaging the strength of the steel pipe structure, and a large-scale scaffolding or the like is not required.

  In addition, the main pillar of the steel pipe structure described above is configured by connecting flanges provided at both ends of a plurality of steel pipes with bolts, etc., of which the inclination angle of the main pillar changes. The flange used for is closed by an iron plate (metal plate). For this reason, when the above-mentioned inspection / repair device is suspended from the upper end of the main column inside the steel pipe to inspect and repair the inner surface of the steel pipe, the inspection / repair device is prevented from descending where the inclination angle of the main column changes. It will be. Therefore, in the steel pipe structure having such a structure, before performing the above-described investigation and repair work, an operation of opening a through hole for allowing the above-described investigation / repair device to pass through the iron plate is performed. In this work, a cutting device provided with a cutting torch of a plasma cutting machine for making a through hole in the iron plate at the tip is used, and the cutting device is used at the upper end of the main column as in the above-described investigation and repair device. It is suspended inside the steel pipe and lowered to the position where the iron plate exists.

JP 2004-011013 A JP 2004-286114 A JP-A-2005-090173

  By the way, the steel pipe structure described above may be constructed in a place where it is difficult to carry in heavy machinery such as a mountainous area, and when performing the maintenance work of the steel pipe structure constructed in such a place, Repair devices and cutting devices had to be transported manually. Here, the electric power supplied to the cutting torch of the above-described cutting device is usually provided by a generator. However, since the power consumption of the cutting torch is large, a large generator is required. For this reason, the weight of one generator may reach several hundred kg, for example, and it is very difficult to carry such a generator manually. Although it is conceivable to disassemble and transport the generator, since this type of generator is not premised on disassembly, even if it can be disassembled, the weight of each part after disassembly is not always equalized. In addition, since the assembly work must be performed again on site, the maintenance work of the steel tower becomes complicated and the work time is greatly increased.

  The present invention has been made in view of such circumstances, and in the case of performing maintenance work on a steel pipe structure constructed in a mountainous area, a cutting apparatus capable of easily carrying equipment by hand is provided. It is intended to provide.

  In order to solve the above-mentioned problem, the present invention is a cutting device for cutting a metal plate that closes the inside of a main pillar of a steel pipe structure having a main pillar erected by connecting a plurality of steel pipes, A torch part that is inserted into the main pillar and generates a plasma arc for cutting the metal plate, and an output of electric power and operating gas (for example, air) supplied to the torch part to generate the plasma arc A control unit that performs control, and a power supply unit that supplies power to the control unit as a source of power to be supplied to the torch unit, and the power supply unit connects a plurality of battery modules containing batteries in series. The battery module is connected to a housing for housing the battery therein, a handle provided on the surface of the housing, and a positive electrode and a negative electrode of the battery, and is provided on the surface of the housing. Multiple power connectors , Appear in the casing surface in association with each of said plurality of power supply connectors, is characterized in that it comprises a mark each represent the polarity of the corresponding power connector.

  Here, the type of the battery accommodated in the housing of the battery module may be a primary battery or a secondary battery. Moreover, what is necessary is just to determine suitably about the quantity of the battery accommodated in a housing | casing in consideration of the electric power required by a torch part, and conveyance by manpower. Furthermore, the number of handles provided on the housing surface and the mounting position may be determined as appropriate according to the dimensions and weight of the housing.

  According to the present invention, as a power source for a plasma arc generated in the torch part, a plurality of battery modules having a casing housing a battery therein, a handle provided on the surface of the casing, and a power connector are connected in series. Use the one connected to. For this reason, when the cutting device according to the present invention is transported manually to a steel tower built in a mountainous area, each battery module constituting the power supply unit can be individually transported, so that the transport burden on the operator is almost equal. Can be distributed. In addition, since the mark representing the polarity of the power connector is shown on the surface of the housing, for example, when electrically connecting between each battery module and between the power supply unit and the control unit at the work site. In addition, the risk of incorrect wiring can be reduced.

  Further, according to the present invention, in the cutting apparatus described above, the casing is a polyhedron, and the plurality of power connectors are provided on any one of a plurality of surfaces forming the casing. It is characterized by having.

  According to the present invention, the housing of the battery module is a polyhedron, and the power connectors provided on the surface of the housing are collectively provided on one surface. For this reason, when arranging a plurality of battery modules at the work site, if the surfaces provided with the power supply connectors are arranged in one direction, it is easy to check and route the wiring connecting the battery modules. .

  Further, according to the present invention, in any one of the above-described cutting apparatuses, the plurality of power connectors have two types of shapes of a plug and a socket, and the power connector connected to the positive electrode of the battery and the negative electrode of the battery The shape is different depending on the power connector connected to the cable.

  According to the present invention, since the shape (plug or socket) of the power connector provided on the surface of the battery module housing is different depending on the polarity of the power source, the power connector on the cable side to be fitted to each power connector By appropriately determining the shape, it is possible to reduce the risk of incorrect wiring between the battery modules and between the power supply unit and the control unit when electrical connection is made.

  ADVANTAGE OF THE INVENTION According to this invention, when performing the maintenance operation | work of the steel pipe structure constructed in the mountain part, conveyance of each part equipment which comprises a cutting device can be easily performed manually.

  Hereinafter, an embodiment as the best mode for carrying out the present invention will be described with reference to the drawings. First, with reference to FIG. 1, the schematic structure of the steel tower used as the object of the maintenance work performed using the cutting device in this Embodiment is demonstrated. FIG. 1 schematically shows the structure of a square steel tower (steel pipe structure) 100 as viewed from the side. As shown in this figure, the square tower 100 is composed of four main pillars 110 mainly standing from the ground g, a horizontal member 120 attached horizontally across the main pillars 110, and an oblique member 130 attached obliquely. Etc.

  Each main pillar 110 includes a plurality (14 in this example) of steel pipes 111, and flanges 112 are provided at both ends of each steel pipe 111. And the one main pillar 110 is comprised by connecting and fixing the flange 112 provided in each steel pipe 111 with a volt | bolt, a nut, etc. Each main pillar 110 has two points at which the inclination angle changes, and the main pillar 110 is divided into three parts, an upper part U, a central part M, and a lower part L, with these inclination angle change points as a boundary. Here, a cross-sectional configuration of the steel pipe 111 and the flange 112 at the change point of the inclination angle will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a boundary portion between the upper portion U and the central portion M. As shown in this drawing, the flange 112 at a location where the inclination angle of the main pillar 110 changes is changed by an iron plate (metal plate) 113. It is blocked. Although not shown, the flange 112 located at the boundary between the central portion M and the lower portion L of the main pillar 110 is also closed by the iron plate 113. That is, the main pillar 110 is in a state of being blocked by the iron plate 113 provided on the flange 112 at two positions.

  For this reason, when the above-described conventional steel pipe inner surface inspection / repair device is suspended from the uppermost steel pipe 111 in the main pillar 110 and maintenance work is performed, the descent of the inspection / repair device causes the iron plate 113 shown in FIG. Therefore, the maintenance work of the central part M and the lower part L of the main pillar 110 cannot be performed. Therefore, prior to the maintenance work, a cutting device is used to open a through hole in the steel plate 113 shown in FIG. The configuration of the cutting device will be described below with reference to the block diagram shown in FIG. In this figure, the battery module group 1 is composed of six battery modules 10 (see FIG. 8), and serves as one power supply unit for supplying power to the plasma arc power supply unit 5. That is, the battery module group 1 generates a voltage of DC 288 volts (that is, a voltage having a sufficient margin for generating a plasma arc) by connecting six battery modules 10 generating a voltage of DC 48 volts in series. It is a power supply for generating.

  The small generator 2 generates a single-phase alternating current of 100 volts and an output of 1600 volts / ampere (1.6 kVA) by a gasoline engine. In addition, even if what is actually marketed is about 20-30 kg, the weight of the generator which has the power generation capability of the small generator 2 is about 20-30 kg, and can be fully transported manually. The transformer 3 boosts the alternating current 100 volt power output from the small generator 2 to an alternating current 200 volt and outputs it to the plasma arc power supply unit 5. The air compressor 4 compresses the atmosphere using the electric power supplied from the small generator 2 and supplies the compressed air to the plasma arc power supply unit 5. The plasma arc power supply unit 5 supplies the direct current 288 volt power supplied from the battery module group 1 and the compressed air supplied from the air compressor 4 to the steel pipe insertion part 7 described later, and is inserted into the steel pipe. The electric power supplied to the unit 7 and the compressed air are controlled. Therefore, the plasma arc power supply unit 5 corresponds to a control unit.

  The plasma arc power supply unit 5 includes a power supply circuit 51, a pressure adjustment valve 52, a plasma control circuit 53, and a constant voltage power supply circuit 54. The power feeding circuit 51 outputs DC 288 volt power supplied from the battery module group 1 to the steel pipe insertion portion 7 in accordance with a control signal from the plasma control circuit 53. The pressure adjusting valve 52 adjusts the pressure of the compressed air supplied from the air compressor 4 and outputs it to the steel pipe insertion portion 7. The plasma control circuit 53 controls the steel pipe insertion part 7 by an operation part (not shown) provided on the surface of the casing of the plasma arc power supply part 5. The constant voltage power supply circuit 54 converts the AC voltage of 200 volts output from the transformer 3 into a DC voltage and outputs it as a power source for the plasma control circuit 53.

  The holding mechanism control unit 6 is an apparatus for driving and controlling a holding mechanism (described in detail later) for holding the position of the steel pipe insertion portion 7 in the steel pipe 111, which is provided in the steel pipe insertion section 7. The holding mechanism control circuit 61 and the constant voltage power supply circuit 62 are included. The holding mechanism control circuit 61 is configured to control a holding mechanism 710 provided in the steel pipe insertion portion 7. The constant voltage power circuit 62 converts the alternating voltage of 100 volts output from the small generator 2 into a direct current voltage, and outputs it to the holding mechanism control circuit 61 as a power source. The small power generator 2 supplies power to the plasma arc power source 5 via the transformer 3 and is another power source that supplies power to the air compressor 4 and the holding mechanism control unit 6. .

  The steel pipe insertion portion 7 is a portion inserted into the steel pipe 111 from the top of the main pillar 110 in order to open a through hole in the iron plate 113 shown in FIG. 2 by plasma cutting, and corresponds to a plasma generation portion. As shown in FIG. 4, the steel pipe insertion portion 7 mainly includes a main body 71 provided with a holding mechanism 710 for holding the steel pipe insertion portion 7 at the axial center position of the steel pipe 111 in the steel pipe 111. And a torch portion 73 that generates a plasma arc by the electric power and compressed air supplied from the plasma arc power source portion 5 and ejects the plasma arc to the iron plate 113. The main body portion 71 and the torch portion 73 both have a rod-like appearance, and the torch portion 73 is attached to the distal end portion of the main body portion 71 (the end portion on the distal end side in the direction in which the steel pipe insertion portion 7 descends). It has been. Further, a mounting bracket for attaching a wire 8 used when the steel pipe insertion portion 7 is suspended in the main pillar 110 to the rear end portion (end portion opposite to the tip portion) of the main body portion 71. 70 is provided.

  Here, with reference to FIG. 5, in order to perform a drilling operation with the cutting device of the present embodiment on the steel plate 113 (see FIG. 2) in the main pillar 110 of the steel tower 100 shown in FIG. 1, The structure for raising / lowering the steel pipe insertion part 7 mentioned above in the main pillar 110 is demonstrated. FIG. 5 is a diagram showing the structure around the top of the steel tower 100 shown in FIG. 1. In this figure, the same parts as those shown in FIG. A top plate 114 for closing the opening of the steel pipe 111 is attached to the uppermost end of each main pillar 110 of the steel tower 100. This prevents rainwater from entering the main pillar 110 and foreign matters from entering. It is out. When performing a drilling operation using the cutting device of this embodiment, after removing the top plate 114 and inserting the steel pipe insertion portion 7 in which the wire 8 is connected to the mounting bracket 70 from the opening of the steel pipe 111, A winch 200 (a portion indicated by hatching in FIG. 5) around which the wire 8 is wound is fixed to the flange 112 of the steel pipe 111. Thereby, when the wire 8 wound up by the winch 200 is sent out, the steel pipe insertion portion 7 can be lowered within the main pillar 110, and conversely, when the wire 8 is wound up, the steel pipe insertion portion 7 is raised. Can do.

  Returning to FIG. 4, the main body portion 71 of the steel pipe insertion portion 7 expands the support arm 711 from the inside of the main body portion 71 to the outside according to the control signal output from the holding mechanism control circuit 61 described above, or from the outside to the main body. A plurality of stages (three stages in the illustrated example) of the holding mechanism 710 stored in the section 71 are arranged along the axial direction of the main body section 71.

  Hereinafter, the configuration of the holding mechanism 710 will be described in more detail with reference to FIG. The support arm 711 is provided in three positions substantially equally divided in the circumferential direction of the main body 71 (in the example shown, three sets are provided with the arms spaced 120 degrees in the circumferential direction, but separated by 90 degrees in the circumferential direction). 4 sets, or 2 sets can be provided 180 degrees apart in the circumferential direction). The support arm 711 disposed at each position has a base end portion (upper end portion) supported by a shaft 712 in the main body 71, and the support arm 711 rotates around the shaft 712, The leading end moves from the inside of the main body 71 to the outside or from the outside to the main body 71. Further, a wheel 713 is attached to the tip of the support arm 711. When the support arm 711 is deployed, the wheel 713 comes into contact with the inner surface of the steel pipe 111, and the steel pipe of the insertion portion 7 in the steel pipe remains in this state. The movement (lifting / lowering) in the body 111 can be performed smoothly.

  The above-described drive of the support arm 711 is performed by converting the forward / reverse motion of the motor 714 such as a stepping motor into a linear motion in the vertical direction in FIG. 6 by the screw mechanism 715 and supporting this vertical motion via the rack gear 716. This is performed by transmitting to a pinion gear 717 fixed at a position coaxial with the shaft 712 in the arm 711. That is, when the rack gear 716 moves downward in FIG. 6, the tip of the support arm 711 expands, the wheel 713 contacts the inner wall surface of the steel pipe 111, and the rack gear 716 moves upward in FIG. 6. Then, the support arm 711 rotates in the direction in which the wheel 713 is stored in the main body 71.

  As described above, each holding mechanism 710 is provided in the main body 71, each supporting arm 711 is expanded, and the rolling wheel 713 provided at the tip thereof is brought into contact with the inner wall surface of the steel pipe 111, so The position of the steel pipe insertion portion 7 is maintained. Accordingly, when the steel pipe insertion portion 7 is moved up and down by the winch 200 shown in FIG. 5 or during drilling work on the iron plate 113, the steel pipe insertion portion 7 collides with the inner wall of the steel pipe 111, and the steel pipe insertion is performed. There is no possibility of damaging the part 7 and the steel pipe 111.

  6 shows a state in which the main body 71 is held at the axial center position of the steel pipe 111 by the support arm 711 in the steel pipe 111 whose axis extends in the vertical direction. Thus, even if the main pillar 110 is inclined and the inclination angles thereof are different between the upper portion U, the central portion M, and the lower portion L, the in-steel pipe insertion portion 7 is held substantially at the axial center position of the steel pipe 111. It is possible. Further, the pinion gear 717 has teeth that mesh with the rack gear 716 over the entire circumference, but this tooth meshes with the rack gear 716 only within a range corresponding to the pivotable angle of the support arm 711. You may make it form.

  Returning to FIG. 4, as described above, the torch portion 73 is attached to the distal end portion of the main body portion 71. Hereinafter, referring to FIG. 7, the distal end portion of the main body portion 71 to which the torch portion 73 is attached. And the structure of the torch part 73 will be described. The torch portion 73 is attached to the main body 71 so as to be rotatable about a rotation axis that coincides with the central axis C of the main body 71. In other words, a rotation shaft 720 is provided coaxially with the central axis C of the main body 71 at the tip of the main body 71, and a gear 721 attached to the rotation shaft 720 is attached to a drive shaft of a motor 722 such as a stepping motor. The rotation of the rotating shaft 720 is controlled by the motor 722 by meshing the received gear 723.

  The torch part 73 includes a cutting torch part 730 that generates a plasma arc, a torch support arm 740 that supports the cutting torch part 730, and an arm drive part 750 that controls tilting of the torch support arm 740. The cutting torch part 730 includes a torch main body 731 and a torch tip part 732, and arc discharge is generated in the torch tip part 732 by electric power supplied from the power supply circuit 51 of the plasma arc power supply part 5 shown in FIG. 3. An electrode to be generated is provided, and an arc generated by the electrode is thermally restrained by compressed air (operating gas) supplied through the pressure regulating valve 53 shown in FIG. It is generated from the nozzle N as an arc. In addition, the electric power and compressed air supplied to the cutting torch part 730 are sent from the plasma arc power supply part 5 via the cable 74 comprised with a power line and a tube, respectively.

  The torch support arm 740 is made of a rod-like member, and a gripping portion 741 for gripping the torch main body 731 is formed at the end on the distal end side in the descending direction of the steel pipe insertion portion 7. Also, the end opposite to the end where the gripping portion 741 is formed is attached to an arm driving portion 750 described later via a shaft 742 that rotatably supports the torch support arm 740. A pinion gear 743 that meshes with a rack gear 753 described later is fixed to the torch support arm 740 coaxially with the shaft 742. A motor 751 such as a stepping motor is provided inside the arm drive unit 750, and the rotational motion of the drive shaft of the motor 751 is converted into a linear motion in the vertical direction in FIG. This linear motion in the vertical direction is transmitted to the rack gear 753 described above, and the pinion gear 743 rotates. Thus, when the rack gear 753 moves downward, the pinion gear 743 rotates counterclockwise in FIG. 7 and tilts so that the torch support arm 740 is deployed, and the nozzle N of the torch tip 732 is moved to the steel pipe. It moves in a direction approaching the inner wall surface of 111.

  At the tip of the arm drive unit 750, a video camera 754 for observing the state and working state in the steel pipe 111 during drilling of the iron plate 113 and a high-intensity LED 755 used as illumination at the time of shooting by the video camera 754 are provided. It has been. As a result, the operator can control the position and posture of the steel pipe insertion portion 7 and confirm the image photographed by the video camera 754 with a monitor (not shown), and a torch tip for opening a through hole in the iron plate 113. The movement control of 732 is performed. That is, first, the holding mechanism control circuit 61 drives and controls the motor 714 of each holding mechanism 710 so that the steel pipe insertion portion 7 is positioned at the axial center position of the steel pipe 111. And by the winding / feeding-out control of the wire 8 by the winch 200, the steel pipe insertion portion 7 is lowered to the vicinity of the iron plate 113 to be drilled.

  Next, the holding mechanism control circuit 61 drives and controls the motor 751 provided in the arm drive unit 750 to move the torch tip 732 to the vicinity of the inner wall surface of the steel pipe 111, and in this state, the main body 71 The motor 722 provided at the tip of the arm is driven to rotate the entire arm driving unit 750. As a result, the torch tip 732 moves on the iron plate 113 so as to draw a circle along the inner wall surface of the steel pipe 111 around the central axis C of the main body 71. At this time, when electric power and compressed air are supplied from the plasma arc power source unit 5 to the cutting torch unit 730 via the cable 74, a plasma arc of tens of thousands of degrees is generated from the nozzle N of the torch tip 732, and the plasma arc By partially removing a part of the iron plate 113 by thermal energy and mechanical energy, a through hole can be finally opened.

  Next, the configuration of the battery module group 1 shown in FIG. 3 will be described with reference to FIGS. Here, FIG. 8 is an explanatory diagram for explaining the electrical connection between the battery module group 1 and the plasma arc power supply unit 5, and FIG. 9 is a diagram showing the external appearance of each battery module constituting the battery module group 1. (A) is a top view, (b) is a front view, (c) is a left side view, and (d) is a right side view. Moreover, FIG. 10 is explanatory drawing for demonstrating the structure inside a battery module, and FIG. 11 is sectional drawing which shows the AA cross section in FIG.

  As described above, the battery module group 1 includes six battery modules 10 connected in series by the power cable 23, the positive electrode of the battery module 10 located at one end connected in series, and the other The negative electrode of the battery module 10 located at the end is connected to a power input terminal (not shown) of the plasma arc power supply unit 5. As shown in FIG. 9, the casing of each battery module 10 mainly includes a box 11 having a rectangular parallelepiped appearance, and a lid 12 fixed by a bolt B so as to close an upper opening of the box 11. When the lid 12 is fixed to the box 11, the packing 13 is interposed between the two. Here, the packing 13 is not an essential component and can be omitted. Handles 14 and 14 are respectively attached to the upper part of the left side surface and the right side surface of the box 11 so that the operator can easily lift the battery module 10. A power connector having a shape corresponding to the polarity of the battery module 10 is provided below the handle 14 on each side surface.

  Here, there are two types of power connector shapes, a power socket 15S and a power plug 15P. A power socket 15S is provided directly below the handle 14 on the left side, and a power plug is positioned directly below the handle 14 on the right side. 15P is provided. The power socket 15S is a positive electrode of the battery module 10, and the power plug 15P is a negative electrode. A plug 23P attached to one end of the power cable 23 is fitted into the power socket 15S, and the socket 23S attached to the other end of the power cable 23 different from the power cable 23 described above is fitted to the power plug 15P. Are fitted (see FIG. 9A).

  Further, as shown in FIGS. 9A to 9D, the upper surface (the surface of the lid body 12), the front surface, the back surface, and both side surfaces of the battery module 10 correspond to the positive electrode of the power socket 15S. A “+” mark M is drawn, and a “−” mark M is drawn corresponding to the negative electrode of the power plug 15P. The mark M may be a sticker on which the seal on which the mark M is written is attached to the above-described upper surface or the like.

  Next, the internal configuration of the battery module 10 will be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram showing a state in which the lid 12 is removed from the top view shown in FIG. 9A. In this figure, a part of the handle 14 is shown in order to illustrate the entire power plug 15P. Shown in a broken state. As shown in FIGS. 10 and 11, on the bottom surface of the box body 11, two crosspieces 16 extending along the vertical direction (longitudinal direction) of the bottom surface have a predetermined interval (at least a lead storage battery (hereinafter described later) (Referred to as “battery”) is fixed at an interval longer than the length in the lateral direction (longitudinal direction) in plan view of 18. In addition, eight partition plates 17-1 to 17-8 are fixed between the crosspieces 16 on the bottom surface in order to configure sections for installing the four batteries 18, respectively. That is, the interval between the first set of partition plates 17-1 and 17-2, the interval between the second set of partition plates 17-3 and 17-4, and the third set of partition plates 17-5 and 17-6. , And the fourth set of partition plates 17-7 and 17-8 are at least longer than the length in the longitudinal direction (direction perpendicular to the longitudinal direction) of the battery 18 in plan view. . Here, the output voltage (rated voltage) of each battery 18 is 12 volts.

  As shown in FIG. 11, each battery 18 is fixed to each section described above by a fixing plate 19 and a fixing rod 20. The fixing rod 20 is formed of a rod-shaped member, one end of which is bent into a bowl shape, and the other end is formed with a male screw. Then, one end of the fixing rod 20 bent in a bowl shape is hooked in a mounting hole 17a formed in the approximate center in the longitudinal direction of each partition plate 17-1 ... 17-18, and a male screw is formed. The other end is passed through holes formed at both ends of the fixing plate 19, and then the nut b is tightened to hold the fixing plate 19 against the upper surface of the battery 18, thereby fixing the battery 18 to each compartment. .

  Further, the batteries 18 fixed to the respective compartments are connected in series by battery cables 21 each having a battery terminal fixed to each electrode of the battery 18 at both ends. That is, among the four batteries 18, the positive electrode of one adjacent battery 18 and the negative electrode of the other battery 18 are connected by the battery cable 21. The positive electrode of the battery 18 located at one end of the box 11 (that is, located at one end connected in series) is connected to the terminal of the power socket 15S by the connection cable 221 and located at the other end. The negative electrode of the battery 18 (that is, located at the other end connected in series) is connected to the power plug 15P by the connection cable 222.

  Thus, according to the cutting device of this embodiment, since electric power is supplied from the battery module group 1 to the plasma arc power supply unit 5, even when a maintenance work is performed on a steel tower constructed in a mountainous area. The battery module group 1 can be divided into six battery modules 10 for transportation. That is, it is possible to reduce the burden on each worker when the power supply of the cutting device is manually transported and to divide the burden on each worker almost equally. Also, at the work site, for example, as shown in FIG. 12, by installing the battery modules 10 in one row vertically, the installation place of the power source (that is, the battery module) can be narrowed and flattened. This is advantageous in mountainous areas where sufficient space cannot be secured. In FIG. 12, reference numeral 23 ′ denotes a power cable for connecting the battery modules 10 in series and corresponds to the power cable 23 described above.

  Further, since the “+” mark M is drawn corresponding to the power supply socket 15S and the “−” mark M is drawn corresponding to the power supply plug 15P, the positive and negative electrodes in the battery module 10 are clarified and incorrect wiring is performed. Can reduce the possibility. Furthermore, since these marks M are drawn on the upper surface, front surface, back surface, and both side surfaces of the battery module 10, respectively, for example, as shown in FIG. 8, when arranging a plurality of battery modules 10 side by side, As shown in FIG. 12, the mark M can be visually recognized even when stacked.

  Next, a battery module 10 ′ different from the battery module 10 described above will be described with reference to FIGS. 13 to 15. Here, FIG. 13 is a view showing the appearance of the battery module 10 ′, (a) is a top view, (b) is a front view, (c) is a left side view, and (d) is a right side view. is there. FIG. 14 is an explanatory diagram for explaining the internal structure of the battery module 10 ′ shown in FIG. 13. In FIG. 14, a part of one handle 14 is broken to illustrate the entire power plug 15P. Shown in the state. FIG. 15 is an explanatory diagram for explaining an electrical connection between the battery module group 1 including the battery module 10 ′ shown in FIGS. 13 and 14 and the plasma arc power supply unit 5. In FIGS. 13 to 15, elements common to the components shown in FIGS. 8 to 10 are denoted by the same reference numerals as those shown in FIGS. 8 to 10, and description thereof is omitted. To do.

  The difference between the battery module 10 ′ shown in FIG. 13 and the battery module 10 shown in FIG. 9 is that the power socket 15S and the power plug 15P are integrated on one side (the left side as shown in FIG. 13C). It is a point provided. Thereby, as shown in FIG. 14, the length of the cable 222 ′ connecting the negative electrode of the battery 18 located at the other end in the box 11 and the power plug 15P is the cable 222 shown in FIG. However, since it is not necessary to secure a space for attaching the power plug 15P on the right side surface of the box 11, the battery 18 positioned at the other end and the right side of the box 11 The interval can be narrowed. Accordingly, in the battery module 10 ′ shown in FIGS. 13 and 14, the longitudinal length of the box 11 is shorter than that of the battery module 10 shown in FIG. 9. That is, the battery module 10 ′ can be made more compact than the battery module 10.

  Further, as shown in FIG. 15, even when six battery modules 10 ′ are installed side by side, the connection of each battery module 10 ′ by the power cable 23 ″ is connected to the surface on one side of the battery module 10 ′ ( That is, since it can be performed on the left side shown in FIG. 13C, the wiring can be easily confirmed, and the length of each power cable 23 ″ can be shortened. Note that the power cable 23 ″ corresponds to the power cable 23 described above.

  In the battery modules 10 and 10 'shown in FIGS. 9 and 13, the handles 14 are provided on the left side and the right side, respectively. For example, the battery modules 10 and 10' can be lifted with one hand. If the size and weight are possible, only one handle may be provided on the surface of the lid portion 12. Further, although the polarity of the power socket 15S is positive (positive electrode) and the polarity of the power plug 15P is negative (negative electrode), the correspondence between the polarity and the type of the power connector is not limited to this. Furthermore, the shape of the power connector may not be changed according to the type of polarity (plus or minus), and for example, all the power connectors may be unified with the power socket 15S.

It is a side view which shows schematic structure of the steel tower used as the object of the drilling operation | work by the cutting device in one embodiment of this invention. It is sectional drawing which shows the position of the iron plate in the main pillar of a steel tower by which a through-hole is opened by the same cutting device. It is a block diagram which shows the structure of the cutting device. It is explanatory drawing for demonstrating the structure of the steel pipe internal insertion part which makes a part of the cutting device. It is a schematic side view of the tower top part which shows the structure for raising / lowering the steel pipe insertion part of the cutting device within the main pillar of a steel tower. It is explanatory drawing for demonstrating the structure of the main-body part in the steel pipe insertion part of the cutting device. It is explanatory drawing for demonstrating the structure of the torch part in the steel pipe insertion part of the cutting device. It is explanatory drawing for demonstrating the structure and electrical connection content of the battery module group in the cutting device. It is a figure which shows the external appearance of the battery module which comprises the battery module group in the cutting device, (a) is a top view, (b) is a front view, (c) is a left side view, (d) is a right side view. is there. It is explanatory drawing for demonstrating the internal structure of the battery module shown in FIG. It is sectional drawing which shows the AA cross section in explanatory drawing of FIG. It is explanatory drawing for demonstrating the electrical connection content when the battery module in the cutting device in one embodiment of this invention is piled up. It is a figure which shows the external appearance of the battery module which has a structure different from the battery module shown in FIG. 9, (a) is a top view, (b) is a front view, (c) is a left side view, (d) is a right side. FIG. It is explanatory drawing for demonstrating the internal structure of the battery module shown in FIG. It is explanatory drawing for demonstrating the structure of the battery module group at the time of using the battery module shown in FIG. 13, and the electrical connection content.

Explanation of symbols

1 Battery module group (power supply unit)
2 Small generator 3 Transformer 4 Air compressor 5 Plasma arc power supply (control unit)
6 Holding Mechanism Control Unit 7 Steel Pipe Insertion Unit 10 Battery Module 11 Box 12 Lid 13 Packing 14 Handle 15S Power Socket (Power Connector)
15P power plug (power connector)
16 Cross 17 Partition plate 17a Mounting hole 18 Battery (battery, lead-acid battery)
DESCRIPTION OF SYMBOLS 19 Fixing plate 20 Fixing rod 21 Battery cable 22 Connection cable 23, 23 ', 23''Power supply cable 51 Feeding circuit 52 Pressure regulating valve 53 Plasma control circuit 54, 62 Constant voltage power supply circuit 61 Holding mechanism control circuit 71 Main part 73 Torch part 710 Holding mechanism 100 Steel tower (square tower, steel pipe structure)
110 Main pillar 111 Steel pipe M mark

Claims (3)

A steel pipe structure having a main pillar erected by connecting a plurality of steel pipes, a cutting device for cutting a metal plate closing the inside of the main pillar,
A torch part that is inserted into the main pillar and generates a plasma arc for cutting the metal plate;
A control unit that performs output control of electric power and working gas supplied to the torch unit to generate the plasma arc;
A power supply unit that supplies power to the control unit as a source of power to be supplied to the torch unit, and the power supply unit is formed by connecting a plurality of battery modules containing batteries in series,
The battery module is
A housing that houses the battery therein;
A handle provided on the surface of the housing;
A plurality of power connectors respectively connected to the positive electrode and the negative electrode of the battery and provided on the surface of the housing;
A cutting apparatus comprising: a mark that is displayed on the surface of the housing in association with each of the plurality of power connectors, and that indicates the polarity of each corresponding power connector.   The said housing | casing is a polyhedron, The said several power connector is integrated and provided in any one surface among the several surface which forms this housing | casing. Cutting device.   The plurality of power connectors have two types of shapes, a plug and a socket, and the shapes differ between a power connector connected to the positive electrode of the battery and a power connector connected to the negative electrode of the battery. The cutting device according to claim 1 or 2, wherein

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