JP2009101459A - Fluid removal tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid removal tool capable of removing fluid out of a container without leaking the fluid into a working space. <P>SOLUTION: The fluid removal tool 100 opens a hole 16 in a tank 13 which contains PCB oil and removes the PCB oil from the tank 13 through the hole 16. The fluid removal tool 100 includes a drill blade 51, a tool body 20, and a drill blade coming-off preventing metal fitting 56. The drill blade includes a top end portion 52 and a shank portion 54. The tool body 20 movably supports the drill blade 51 in an axial direction. A fluid penetration space 21 in which the front end portion 52 is disposed and which opens on a line in the axial direction of the drill blade 51, and a through-hole 28 which is communicated with the fluid penetration space 21 and in which the shank portion 54 is inserted are formed in the tool body 20. The drill blade coming-off preventing metal fitting 56 locks the drill blade 51 to the tool body 20, and regulates movement of the drill blade 51 in a reversal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates generally to a fluid removal tool, and more particularly to a fluid removal tool for removing oil containing PCB (polychlorinated biphenyl) from a tank of an electrical device.

  Regarding a conventional fluid draining tool, for example, Japanese Patent Laid-Open No. 5-272682 discloses a pipe branching method for performing branching work without stopping water distribution in a pipe during operation of a production line or the like. Is disclosed (Patent Document 1).

In the piping method described in Patent Document 1, a gate valve connected to a branch port formation scheduled portion of the main pipe via a connection pipe and a punching machine for punching the branch port formation planned portion are used. The branching operation will be described. First, the opening edge portion of the connection pipe is joined to the branch port formation scheduled portion of the main pipe by welding. Next, the gate valve connected to the connecting pipe is fully opened, and the piercing tool is passed through the gate of the gate valve from the outlet of the gate valve, with the horuso first. Next, the piercing tool is rotated with an electric drill while pressing the horuso against the branch port formation planned portion, and the branch port is cut out at the branch port formation planned portion. When the branch port is formed, water flows out from the main pipe through the branch port. Next, the gate valve is closed and the horso is removed from the gate valve. Finally, when the branch pipe is attached to the outlet side flange of the gate valve, the branching operation is completed.
JP-A-5-272682

  PCB (polychlorinated biphenyl) has been used in a wide range of applications including electrical devices such as transformers and capacitors due to its insulating properties and nonflammability. However, the harmful effects of PCBs on the human body became clear, and under the "Special Measures Law for Promotion of Proper Treatment of Polychlorinated Biphenyl Waste" enforced on July 15, 2001, Reliable and appropriate processing is in progress. In the treatment of such PCB waste, it is necessary to first extract oil containing PCB (hereinafter also referred to as PCB oil) from the container.

  However, for example, when the piping branching method disclosed in the above-mentioned Patent Document 1 is used for extracting the PCB oil, when removing the horso from the sluice valve after closing the sluice valve, the oil in the drilling tool such as the horso The exposed part and the oiled part of the gate valve are exposed to the work space. In this case, there arises a problem that PCB oil adhering to or accumulating at these parts leaks into the work space. In addition to such a method, a method using a split T-shaped pipe used for branching a water pipe is also conceivable. However, a container in which PCB oil is arranged often has a shape other than a cylinder, and a split T-shaped tube cannot be used.

  Accordingly, an object of the present invention is to solve the above-described problem and to provide a fluid removal tool for extracting fluid from a container without leaking it into a work space.

  The fluid draining tool according to the present invention is a fluid draining tool that opens a hole in a container in which a fluid is disposed and pulls the fluid from the container through the hole. The fluid removal tool includes a drill blade, a tool body, and a locking member. The drill blade includes a tip portion and a shaft portion. The tool body supports the drill blade so as to be movable in the axial direction. In the tool body, a tip portion is disposed, and a space that is opened on the axial line of the drill blade and a through hole that communicates with the space and into which the shaft portion is inserted are formed. The locking member locks the drill blade with respect to the tool body and restricts the movement of the drill blade in the backward direction.

  According to the present invention, it is possible to provide a fluid removal tool for extracting fluid from a container without leaking it into the work space.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a perspective view showing a transformer. Referring to FIG. 1, transformer 10 includes a tank 13 in which PCB oil is disposed together with an iron core 11 and a coil 12. The tank 13 is made of metal, for example, iron or stainless steel.

  The tank 13 includes a side surface 13b and a bottom surface 13c. In the present embodiment, a case is described in which a hole is formed in the side surface 13b and the PCB oil is extracted from the hole. However, the position where the hole is provided is not limited to the side surface 13b, and may be the bottom surface 13c, for example.

  FIG. 2 is a cross-sectional view showing a form of use of the oil removal tool in Embodiment 1 of the present invention. With reference to FIG. 1 and FIG. 2, the basic structure of the oil removal tool 100 in the present embodiment will be described first. The oil removal tool 100 opens a hole in a tank 13 in which PCB oil is disposed, and passes the tank through the hole. 13 is a tool for removing PCB oil from 13. The oil removal tool 100 includes a drill blade 51, a tool body 20, and a drill blade removal prevention fitting 56 as a locking member. The drill blade 51 includes a tip portion 52 and a shaft portion 54. The tool body 20 supports the drill blade 51 so as to be movable in the axial direction. The tool body 20 is provided with a tip 52, an oil immersion space 21 as a space opened on the axial line of the drill blade 51, and a penetration that communicates with the oil immersion space 21 and into which the shaft portion 54 is inserted. A hole 28 is formed. The drill blade removal prevention fitting 56 locks the drill blade 51 with respect to the tool body 20 and restricts the movement of the drill blade 51 in the backward direction.

  Next, the detailed structure of the oil removal tool 100 in FIG. 2 will be described. The oil removal tool 100 includes a drill blade 51 that opens a hole in the tank 13 and a tool body 20 that supports the rotating drill blade 51 so as to be movable in its axial direction. The tool body 20 is fixed to the tank 13. The PCB oil discharged from the tank 13 is collected in a collection container (not shown) through an oil immersion space 21 formed in the tank 13.

  The tool body 20 includes a front end part 22, a companion flange 23, and a rear end part 24 that are fastened together, and a dry bearing 26 and a dry bearing 27 that support rotation of the drill blade 51 and feed in the axial direction thereof. Has been. The front end part 22 is fixed to the tank 13. The rear end part 24 is connected to the front end part 22 with a companion flange 23 interposed therebetween. The dry bearing 26 and the dry bearing 27 are provided on the front end part 22 and the rear end part 24, respectively.

  The front end part 22 has a cylindrical shape, and extends from the tank 13 in a direction away from the tank 13, a flange portion 31 that extends in a bowl shape from one end of the straight pipe 32, and a bowl shape that extends from the other end of the straight pipe 32. A flange portion 34 and a branch pipe 33 having a cylindrical shape and branching from the straight pipe 32 are included. The flange portion 31 is disposed so as to face the tank 13 and is fixed to the tank 13 with the packing 44 sandwiched therebetween. The packing 44 prevents PCB oil from leaking from between the tank 13 and the tool body 20. An oil immersion space 21 is formed inside the flange portion 34 and the straight pipe 32. The oil immersion space 21 is opened on the axis of the drill blade 51 inserted into the through hole 28. The oil immersion space 21 is opened at a position inside the flange portion 31. The flange portion 34 and the companion flange 23 are fastened by bolts. An O-ring 62 is provided on the mating surface between the flange portion 34 and the companion flange 23. The branch pipe 33 is connected to a valve 35 that allows the branch pipe 33 to be opened and closed. Although not shown, a PCB oil recovery pump and a recovery container are provided at the tip of the valve 35 and are connected by a coupler joint or the like.

  The rear end component 24 includes a flange portion 36 that is opposed to the flange portion 34 and extends in a bowl shape. The flange portion 36 and the companion flange 23 are fastened by bolts. A fitting portion 37 of the companion flange 23 is fitted to the inner periphery of the flange portion 34 and the flange portion 36.

  The tool body 20 is fixed to the tank 13 by stud bolts 41 connected to the tank 13. The stud bolt 41 is inserted through the flange portion 31. In this state, the flange 42 is fixed to the tank 13 by screwing the nut 42 onto the stud bolt 41.

  The stud bolt 41 is connected to the tank 13 by electric resistance welding. The tool body 20 is not welded directly to the tank 13. In the present embodiment, electric resistance welding that does not require the skill of the operator can be used by the configuration in which the tool body 20 is fixed to the tank 13 using the stud bolt 41. Electrical resistance welding refers to a method in which a current is passed through a metal material to be welded to heat and locally melt the material by electrical resistance and join. Thereby, even if the tank 13 is thinned due to aging, the tool body 20 can be fixed to the tank 13 without opening a through hole in the side surface 13b of the tank 13. In addition, the welding operation can be completed in a short time by using electric resistance welding. Thereby, the raise of the surface temperature inside the tank 13 can be suppressed, and generation | occurrence | production of the dioxin resulting from heat_generation | fever of PCB oil can be suppressed.

  The tool body 20 is formed with a through hole 28 into which the drill blade 51 is inserted. The through hole 28 communicates with the oil immersion space 21. The through hole 28 penetrates the front end part 22, the companion flange 23 and the rear end part 24 so as to reach from the oil immersion space 21 to the work space outside the tool body 20. The drill blade 51 inserted into the through hole 28 is supported by the tool body 20 so as to be movable in the axial direction of the drill blade 51.

  The dry bearings 26 and 27 are dry friction bearings based on lubrication with a solid lubricant. The dry bearings 26 and 27 have a shape that extends in a cylindrical shape on the outer periphery of the drill blade 51. The inner peripheral surfaces of the dry bearings 26 and 27, together with the inner peripheral surfaces of the front end part 22, the companion flange 23 and the rear end part 24, define a through hole 28.

  The drill blade 51 is a cutting edge portion of the drill blade 51, and includes a distal end portion 52 that is a portion that comes into contact with the tank 13 at the time of drilling by the drill blade 51. The tip 52 is disposed in the oil immersion space 21. The drill blade 51 includes a shaft portion 54 that is a portion extending from the tip portion 52 in the axial direction of the drill blade 51. The shaft portion 54 is inserted into the through hole 28. The drill blade 51 includes a rear end portion 53 that is an end portion of the drill blade 51 on the side opposite to the front end portion 52. The rear end portion 53 is connected to a drill body 55 that applies a rotational force to the drill blade 51. The rear end portion 53 is exposed to the work space. The length of the drill blade 51 is determined so that a stroke sufficient to penetrate the wall surface of the tank 13 with the drill body 55 chucked is obtained.

  The oil extraction tool 100 is provided in the through hole 28 and includes an O-ring 61 as a first seal member that seals between the drill blade 51 and the tool body 20. The oil removal tool 100 has a double seal structure composed of O-rings 61m and 61n. The O-ring 61 is provided in the fitting portion 37 of the companion flange 23. The O-ring 61 is disposed between the dry bearing 26 and the dry bearing 27. The O-ring 61 prevents PCB oil that has entered the oil immersion space 21 from leaking into the work space through the through hole 28.

  The drill blade 51 is provided with a drill blade removal prevention fitting 56. When the drill blade 51 is to be pulled out from the through hole 28 in the backward direction (direction from the front end portion 52 toward the rear end portion 53), the drill blade removal preventing metal fitting 56 and the tool body 20 come into contact with each other. Thereby, the drill blade 51 is latched with respect to the tool main body 20, and the movement to the reverse direction of the drill blade 51 is controlled. Further, after drilling the tank 13 with the drill blade 51, if the drill blade 51 is pushed in the forward direction (the direction from the rear end portion 53 toward the front end portion 52), the drill blade removal prevention fitting 56 and the tank 13 are pressed. And abut. Thereby, the movement to the advance direction of the drill blade 51 is controlled. In other words, after drilling the tank 13, the drill blade removal prevention metal fitting 56 restricts the movement of the drill blade 51 in the axial direction in a state where the oil removal tool 100 is mounted on the tank 13. The state of being inserted into the through hole 28 is maintained.

  In the present embodiment, the drill blade removal prevention metal fitting 56 has a ring shape and is fitted on the outer periphery of the drill blade 51. The drill blade removal prevention metal fitting 56 is detachable from the drill blade 51, and is fixed to the drill blade 51 with a set screw, for example. The drill blade removal prevention metal fitting 56 is disposed in the oil immersion space 21.

  Expressing the structure of the oil removal tool 100 separately, the oil removal tool 100 includes a tool body 20 fixed to the tank 15 and a drill blade 51 supported by the tool body 20 and opening a hole in the tank 15. The tool main body 20 communicates with the space in the tank 15 through a hole, and reaches the oil immersion space 21 from the outside of the tool main body 20 and the oil immersion space 21 that is a fluid intrusion space into which PCB oil enters. A through hole 28 to be inserted is formed. The oil removal tool 100 includes a drill blade removal prevention metal fitting 56 that holds the drill blade 51 in a state of being inserted into the through hole 28 by restricting the movement of the drill blade 51 in the axial direction.

  Next, a method for removing PCB oil from the tank 13 using the oil removal tool 100 and discarding the PCB oil will be described. The disposal method of the tank 13 that is PCB waste includes a step of fixing the tool body 20 to the tank 13 (an oil removal tool mounting step), a step of drilling holes 16 in the tank 13 by a drill blade 51 (a drilling step), After the step of removing PCB oil from the hole 16 through the oil immersion space 21 (oil removal step) and the step of removing PCB oil, the step of discarding the tank 13 while maintaining the drill blade 51 inserted in the through hole 28 (Disposal process).

  The disposal method of the tank 13 will be described in more detail. Referring to FIG. 2, first, an insulator such as surface coating is removed from the side surface 13 b of the tank 13 corresponding to the position where the oil removal tool 100 is to be attached. At this time, if there is a factor that degrades the sealing performance such as scratches on the surface of the tank 13 in contact with the packing 44, it is removed in advance by polishing or the like. Separately, the stud bolt 41 is connected to the tank 13 by electric resistance welding. Next, the tool body 20 is inserted into the stud bolt 41 with the packing 44 interposed between the tank 13 and the tool body 20. Next, the washer 43 is fitted to the stud bolt 41, and the nut 42 is screwed (attaching process of oil removal tool).

  FIG. 3 is a cross-sectional view showing a drilling process when the oil removal tool in FIG. 2 is used. Referring to FIG. 3, next, the drill blade 51 is pushed toward the tank 13 while being rotated, and the hole 16 is formed in the tank 13 (drilling process).

  FIG. 4 is a cross-sectional view showing an oil removal process when the oil removal tool in FIG. 2 is used. Referring to FIG. 4, when hole 16 penetrates, drill body 55 is removed from drill blade 51. The rear end portion 53 is pulled and the drill blade 51 is removed from the hole 16. The space in the tank 13 and the oil immersion space 21 communicate with each other through the hole 16, and the PCB oil in the tank 13 enters the oil immersion space 21. The valve 35 is opened and the PCB oil is collected in a collection container (not shown) through the branch pipe 33. After extracting the PCB oil, the valve 35 is closed and the previous pipe is removed from the valve 35 (oil removal step).

  FIG. 5 is a cross-sectional view showing a disposal step when the oil removal tool in FIG. 2 is used. Referring to FIG. 5, after that, the tank 13 is transported to a predetermined processing facility while the drill blade 51 is inserted into the through hole 28, and the disposal process is performed (disposition process).

  In the present embodiment, the tool body 20 is not disassembled from the tank 13 after the oil removal step. Further, by providing the drill blade removal prevention metal fitting 56, the drill blade 51 is prevented from being pulled out from the through hole 28 or conversely pushed into the tank 13 side. At this time, since the drill blade removal preventing metal fitting 56 is disposed in the oil immersion space 21, the drill blade removal preventing metal fitting 56 itself is not removed from the drill blade 51. Thereby, the state in which the drill blade 51 is inserted into the through hole 28 is maintained, and the drill blade 51 is used as a plug for closing the through hole 28. Thereby, it can prevent reliably that the site | part of the drill blade 51 and the tool main body 20 immersed in PCB oil is exposed to work space.

  Generally, since an accessory such as a radiator is provided around the transformer 10, the space for installing the oil removal tool 100 is severely limited. Conventionally, when the drill blade is removed from the tool body after completion of the oil removal step, it has been necessary to provide a valve for closing the hole of the tool body into which the drill blade has been inserted. In the present embodiment, since the drill blade 51 is used as a plug for closing the through hole 28, this valve is unnecessary. For this reason, the oil removal tool 100 can be reduced in size, and the oil removal tool 100 can be installed in a limited space.

  During the oil removal process, an air vent hole is required in the tank 13. If this hole cannot be secured, an air vent hole is provided in the wall surface of the tank 13 above the oil level using the oil removing tool 100. It may be provided.

  FIG. 6 is a cross-sectional view showing a first modification of the metal fitting for preventing drill blade removal in FIG. Referring to FIG. 6, in this modification, a drill blade removal prevention pin 57 is provided instead of the drill blade removal prevention metal fitting 56 in FIG. 2. The drill blade removal prevention pin 57 is provided on the tool body 20. A recess 58 is formed in the drill blade 51. The recess 58 is formed to be recessed from the outer peripheral surface of the drill blade 51 over a predetermined range in the axial direction of the drill blade 51. When the pin 57 for preventing the drill blade from fitting is fitted into the recess 58, the axial movement of the drill blade 51 is restricted.

  FIG. 7 is a sectional view showing a second modification of the metal fitting for preventing a drill blade in FIG. Referring to FIG. 7, in this modification, a drill blade removal preventing ball plunger 59 is provided in place of the drill blade removal prevention fitting 56 in FIG. The drill blade 51 is formed with a groove 60s and a groove 60t. The groove 60s and the groove 60t are formed away from each other in the axial direction of the drill blade 51. The movement of the drill blade 51 in the axial direction is restricted when the ball of the ball plunger 59 for preventing the drill blade from slipping fits into the groove 60s and the groove 60t.

  According to the oil removal tool 100 in Embodiment 1 of the present invention configured as described above, the PCB oil can be extracted from the tank 13 without leaking into the work space. Thereby, the tank 13 which is PCB waste can be processed reliably and appropriately.

  In the present embodiment, the case where the PCB oil is extracted from the tank 13 has been described. However, the present invention can also be applied to a liquid or gas other than the PCB oil. The present invention can also be applied to extracting harmful fluids other than PCB oil. However, the application of the present invention is not preferable in the case of a fluid that may be ignited by frictional heat or sparks around the drill blade 51 during the drilling process. Further, in the present embodiment, the stud bolt 41 is attached using electric resistance welding in order to keep the temperature rise of the wall surface of the tank 13 low, but there is no problem such as danger of the fluid with respect to the temperature rise, and If the container wall has a thickness capable of being welded all around, a short tube with a flange may be welded to the container all around.

  The present invention is not limited to a transformer, and may be applied to removing PCB oil from a tank of an electric device such as a capacitor.

(Embodiment 2)
FIG. 8 is a cross-sectional view showing a form of use of the oil removal tool in Embodiment 2 of the present invention. The oil removal tool in the present embodiment is basically provided with the same structure as that of the oil removal tool 100 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIG. 8, in oil removal tool 200 in the present embodiment, drill blade 51 includes a small diameter blade portion 70p having a relatively small diameter and a large diameter blade portion 70q having a relatively large diameter. . As an example, the diameter of the small-diameter blade portion 70p is 6 mm, and the diameter of the large-diameter blade portion 70q is 12 mm. By using such a stepped drill blade 51, the drill blade 51 bites into the tank 13 in the initial stage of drilling. As a result, the small-diameter blade portion 70p that bites into the wall surface of the tank 13 in advance serves as a guide to suppress the deflection of the large-diameter blade portion 70q, and the time required for drilling can be shortened.

  FIG. 9 is a cross-sectional view showing an oil removal process when the oil removal tool in FIG. 8 is used. Referring to FIG. 9, oil removal tool 200 includes an O-ring 63 as a third seal member fitted on the outer periphery of drill blade 51. The O-ring 63 is provided adjacent to the drill blade removal prevention fitting 56. The O-ring 63 is disposed between the drill blade removal prevention fitting 56 and the through hole 28 in the axial direction of the drill blade 51.

  The tool body 20 is a wall surface of the tool body 20 that defines the oil immersion space 21, and includes an end surface 20 c that is continuous with the through hole 28. The end surface 20 c is formed adjacent to the through hole 28. The end surface 20 c is arranged so that the end surface 20 c and the drill blade removal prevention metal fitting 56 face each other in the axial direction of the drill blade 51. The movement of the drill blade 51 in the backward direction is restricted by the end surface 20c and the drill blade removal preventing metal fitting 56 coming into contact with each other.

  The oil removal tool 200 includes a drill blade fixing fitting 71 fitted on the outer periphery of the drill blade 51. After the drilling step, the drill blade fixing metal 71 is fitted to the drill blade 51 from the rear end portion 53 and fixed to the drill blade 51 by, for example, screwing. The drill blade fixing fitting 71 fixes the position of the drill blade 51 at a position where the backward movement of the drill blade 51 is restricted by the drill blade removal prevention fitting 56. At this time, the O-ring 63 is sandwiched between the drill blade removal preventing metal fitting 56 and the end face 20c.

  With such a configuration, during the oil removal process, the O-ring 63 makes it difficult for the PCB oil in the oil immersion space 21 to go to the O-ring 61, so that the possibility of leakage of the PCB oil to the work space can be reduced. Even if the sealing performance by the O-ring 61 is impaired during the drilling process, the O-ring 63 can prevent the PCB oil from leaking into the work space.

  The oil removal tool 200 is provided in the through hole 28 and includes an O-ring 64 as a second seal member that seals between the drill blade 51 and the tool body 20. In the present embodiment, an O-ring 64 is provided on the rear end component 24. The O ring 64 is provided closer to the rear end portion 53 than the O ring 61. A backup ring 65 and a backup ring 66 are disposed on both sides of the O-ring 64, respectively. The backup ring 65 and the backup ring 66 prevent the O-ring 64 from protruding from the groove by maintaining the posture of the O-ring 64. An O-ring 67 is provided on the mating surface between the companion flange 23 and the rear end part 24.

  The distance between the tip 52 of the drill blade 51 and the O-ring 61 is defined as L1 in a state where the movement of the drill blade 51 in the forward direction is restricted by the drill blade removal prevention metal fitting 56. The distance between the tip 52 of the drill blade 51 and the O-ring 64 is defined as L2 in a state where the backward movement of the drill blade 51 is restricted by the drill blade removal prevention metal fitting 56. In this case, the O-ring 64 is positioned so as to satisfy the relationship L1 <L2.

  Through the drilling process and the oil extraction process, the drill blade 51 may be immersed in the PCB oil over a range of a distance L1 from the tip 52. In the present embodiment, even if the rear end portion 53 of the drill blade 51 is pulled after the oil removal step, the portion of the drill blade 51 immersed in the PCB oil does not appear on the working space side from the O-ring 64. For this reason, the external contamination by PCB oil can be prevented more reliably.

  FIG. 10 is a cross-sectional view showing a state after the oil removal step when the oil removal tool in FIG. 8 is used. Referring to FIG. 10, oil removal tool 200 includes a cap 72 as a cover member fixed to tool body 20 so as to cover rear end portion 53. The rear end component 24 is formed with a male screw 24g. The cap 72 is fixed to the rear end component 24 by being screwed onto the male screw 24g. The oil removal tool 200 includes an O-ring 68 as a fourth seal member that is sandwiched between the cap 72 and the tool body 20. The O-ring 68 is provided on the tool body 20 so as to be separated from the drill blade 51.

  According to such a structure, even if the situation where the sealing performance by the O-ring 61 is impaired occurs, the cap 72 can prevent the PCB oil from leaking. Further, the O-ring 68 is disposed away from the drill blade 51. For this reason, even if the drill blade 51 is damaged during the drilling process, the sealing performance by the O-ring 68 is not affected. Thereby, the external contamination by PCB oil can be prevented more reliably. Further, after the oil removal step, the drill blade 51 can be protected by the cap 72, and the possibility of leakage can be reduced.

  FIG. 11 is an enlarged cross-sectional view of a position surrounded by a two-dot chain line XI in FIG. With reference to FIG. 8 and FIG. 11, the oil removal tool 200 includes a cutting waste adsorber 73 as a capturing unit that captures cutting waste in the tank 13 generated during the drilling process. The cutting waste adsorber 73 is disposed in the oil immersion space 21. By providing the cutting dust adsorber 73, foreign matter is prevented from flowing as much as possible downstream from the oil immersion space 21, and the biting of foreign matter into a sealing surface such as the valve 35 can be suppressed.

  In the present embodiment, the tank 13 is made of a magnetic material. The scrap adsorber 73 includes a permanent magnet 74m and a permanent magnet 74n as magnets. The permanent magnet 74m and the permanent magnet 74n have a ring shape. The scrap adsorber 73 includes a permanent magnet 74m and a spacer 75 formed of a magnetic material that is attracted to the permanent magnet 74n. The spacer 75 has a ring shape having an inner diameter larger than that of the permanent magnet 74m and the permanent magnet 74n. A spacer 75 is disposed between the permanent magnet 74m and the permanent magnet 74n. A groove 76 with the spacer 75 as a bottom is formed between the permanent magnet 74m and the permanent magnet 74n. During the step of attaching the oil removal tool 200, the permanent magnets 74m and 74n and the spacer 75 are attracted to the tank 13. By fixing the tool body 20 to the tank 13 so that the permanent magnets 74m and 74n and the spacer 75 are arranged in the oil immersion space 21, the configuration shown in the figure is obtained.

  With such a configuration, since the cutting waste of the tank 13 generated during the drilling process is accumulated in the groove portion 76, the outflow of the cutting waste can be more reliably prevented.

  FIG. 12 is a cross-sectional view showing a modified example of the cutting waste adsorber in FIG. 11. Referring to FIG. 12, in the present modification, a filter 77 as a capturing part is fitted inside the straight pipe 32. The filter 77 is disposed in the oil immersion space 21 so as to block the straight pipe 32 and the branch pipe 33. With such a configuration, the cutting waste generated when the tank 13 is drilled can be captured by the filter 77 regardless of whether the tank 13 is formed of a magnetic material or a non-magnetic material.

  According to the oil removal tool 200 in the second embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained. In addition, installation of various O-rings can more reliably prevent external contamination by PCB oil.

(Embodiment 3)
FIG. 13 is a side view showing an oil removal tool according to Embodiment 3 of the present invention. FIG. 14 is an end view of the oil removal tool along line XIV-XIV in FIG. 13. The oil removal tool in the present embodiment is basically provided with the same structure as that of the oil removal tool 100 in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIGS. 13 and 14, oil removal tool 300 in the present embodiment includes a booster 81 that increases the propulsive force applied to drill blade 51 by an operator using the lever principle. The booster 81 is supported by the tool body 20 and connected to the drill body 55.

  In the present embodiment, the rear end component 24 includes a flange portion 86 instead of the flange portion 36 in FIG. The flange portion 86 has a larger diameter than the flange portion 34 and the companion flange 23. As an example, the flange portion 86 has a diameter that is about 20 mm larger than the flange portion 34 and the companion flange 23.

  The booster 81 includes a front end fitting 82, a slide guide 83, a slide portion 84, and a lever 85. The tip fitting 82 has a semicircular (U-shaped) tip and has a shape extending in the radial direction of the drill blade 51. The tip fitting 82 is fixed to the end face of the flange portion 86 so as to avoid the flange portion 34 and the companion flange 23. When viewed from the axial direction of the drill blade 51, the end fitting 82 overlaps the flange portion 86 beyond the center of the drill blade 51. A slide guide 83 is fixed to the tip fitting 82 using, for example, a bolt. The slide guide 83 extends in the axial direction of the drill blade 51. The slide guide 83 is connected to the drill main body 55 with the slide portion 84 interposed therebetween. A lever 85 is connected to the slide portion 84. By operating the lever 85, the drill main body 55 can be pressed to the tank 13 side with a force of, for example, about 10 times by the lever principle.

  According to the oil removal tool 300 in the third embodiment of the present invention configured as described above, the effects described in the first embodiment can be obtained in the same manner. In addition, by providing the booster 81, the drilling process can be performed in a short time and with a smaller force, and the drill feed at the moment of penetration can be easily controlled. If the drilling process can be performed in a short time, the load on the O-ring 61 and the dry bearings 26 and 27 that support the rotation and feed of the drill blade 51 can be reduced, and the possibility of leakage of PCB oil can be reduced. Further, since the booster 81 can be attached at a position where it does not interfere with the tank 13, it becomes easy to cope with a narrow work space.

(Embodiment 4)
FIG. 15 is a cross-sectional view showing an oil removal tool according to Embodiment 4 of the present invention. FIG. 16 is an end view of the oil removal tool along the line XVI-XVI in FIG. 15. The oil removal tool in the present embodiment basically has the same structure as that of the oil removal tool 200 in the second embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  Referring to FIGS. 15 and 16, in the present embodiment, side surface 13b of tank 13 as an attachment surface has a curved shape. The side surface 13b has a cylindrical surface shape. The oil removal tool 400 includes a companion flange 91 as a spacer member disposed between the side surface 13b and the flange portion 31 as a flange portion. A packing 44 is interposed between the companion flange 91 and the flange portion 31. The oil removal tool 400 includes a packing 92 interposed between the side surface 13 b and the companion flange 91.

  A hole 93 as a first hole having a relatively large diameter is formed in the flange portion 31 and the packing 44. The companion flange 91 and the packing 92 are formed with a hole 94 as a second hole having a relatively small diameter. The drill blade 51 is inserted into the hole 93 and the hole 94.

  In the present embodiment, it is possible to arrange the packing 92 at a position closer to the drill blade 51 by arranging the companion flange 91 in which the hole 94 having a relatively small diameter is formed. As a result, a large crushing margin and a sealing area necessary for sealing the packing 92 can be secured, and the reliability of the sealing between the tank 13 and the tool body 20 can be improved.

  A stud bolt 41 is welded to the curved side surface 13b by electric resistance welding. In the present embodiment, four stud bolts 41 are arranged so as to be symmetrically distributed on both sides of the cylindrical shaft of the side surface 13b. The stud bolt 41 is fixed so as to stand at a right angle to the side surface 13b. In this case, the stud bolt 41 stands so as to open around the axial direction of the drill blade 51. A hole 95 through which the stud bolt 41 is inserted is formed in the flange portion 31, the companion flange 91, the packing 44, and the packing 92. The hole 95 is formed in a long hole shape having a long diameter in the direction in which the stud bolt 41 opens (tilts).

  The oil removal tool 400 includes a plurality of tension screws 96 that are screwed into the flange portion 31 and come into contact with the side surface 13b. By adjusting the protruding length of the tension screw 96 with respect to the side surface 13b, the crushing allowance of the packing 92 and the inclination of the flange portion 31 are adjusted.

  The oil removal tool 400 is provided on the tool body 20 and includes a cylindrical concave washer 97 as a contact member through which the stud bolt 41 is inserted, and a cylindrical convex washer 98 as a washer through which the stud bolt 41 is inserted. The cylindrical concave washer 97 is fixed to the flange portion 31. The cylindrical convex washer 98 receives the nut 42. The cylindrical concave washer 97 and the cylindrical convex washer 98 include a curved surface 97a and a curved surface 98a, respectively. The cylindrical convex washer 98 abuts on the cylindrical concave washer 97 in a state where the curved surface 97a and the curved surface 98a are in surface contact.

  With such a configuration, even when the stud bolt 41 stands obliquely, the inclination of the cylindrical convex washer 98 is adjusted to the inclination of the stud bolt 41 while bringing the curved surface 98a and the curved surface 97a into surface contact. Can do. Thereby, the fastening force by the nut 42 can be made to act on the tool main body 20 reliably.

  If the shape of the tank 13 is known in advance and the stud bolt 41 can be accurately welded at a certain angle, a tapered washer in which the cylindrical concave washer 97 and the cylindrical convex washer 98 are integrated may be used.

  According to the oil removal tool 400 in the fourth embodiment of the present invention configured as described above, the effects described in the first embodiment can be similarly obtained. Moreover, even if it is the tank 13 in which the attachment of the tool main body 20 is restricted to a curved surface such as a cylindrical surface, PCB oil does not leak, so the target of the tank in which the oil removal tool 400 is used can be expanded.

  In addition, you may comprise a new fluid extraction tool combining the structure of the oil extraction tool in Embodiment 1-4 demonstrated above suitably.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view which shows a transformer. It is sectional drawing which shows the form of use of the oil extraction tool in Embodiment 1 of this invention. It is sectional drawing which shows the drilling process at the time of using the oil extraction tool in FIG. It is sectional drawing which shows the oil extraction process at the time of using the oil extraction tool in FIG. It is sectional drawing which shows the disposal process at the time of using the oil extraction tool in FIG. It is sectional drawing which shows the 1st modification of the metal fitting for drill blade omission prevention in FIG. It is sectional drawing which shows the 2nd modification of the metal fitting for drill blade omission prevention in FIG. It is sectional drawing which shows the form of use of the oil extraction tool in Embodiment 2 of this invention. It is sectional drawing which shows the oil extraction process at the time of using the oil extraction tool in FIG. It is sectional drawing which shows the mode after the oil extraction process at the time of using the oil extraction tool in FIG. It is sectional drawing which expands and shows the position enclosed with the dashed-two dotted line XI in FIG. It is sectional drawing which shows the modification of the cutting waste adsorption device in FIG. It is a side view which shows the oil extraction tool in Embodiment 3 of this invention. It is an end elevation of the oil extraction tool along the XIV-XIV line in FIG. It is sectional drawing which shows the oil extraction tool in Embodiment 4 of this invention. FIG. 16 is an end view of the oil removal tool along line XVI-XVI in FIG. 15.

Explanation of symbols

  13 Tank, 13b Side surface, 13c Bottom surface, 16 holes, 20 Tool body, 20c End surface, 21 Oil immersion space, 28 Through hole, 41 Stud bolt, 42 Nut, 51 Drill blade, 52 Tip, 53 Rear end, 54 Shaft , 56 Drill blade removal prevention metal fitting, 57 Drill blade removal prevention pin, 59 Drill blade removal prevention ball plunger, 61, 63, 64, 68 O-ring, 72 Cap, 73 Cutting waste adsorber, 74m, 74n Permanent Magnet, 91 companion flange, 92 packing, 93, 94 hole, 97 cylindrical concave washer, 97a, 98a curved surface, 98 cylindrical convex washer, 100, 200, 300, 400 Oil removal tool.

Claims (12)

A fluid removal tool for opening a hole in a container in which a fluid is disposed and extracting the fluid from the container through the hole,
A drill blade including a tip portion and a shaft portion;
A space in which the tip portion is arranged and opened on an axial line of the drill blade, and a through hole that communicates with the space and into which the shaft portion is inserted are formed, and the drill blade is moved in the axial direction. A tool body that is movably supported;
A fluid removal tool comprising: a locking member that locks the drill blade with respect to the tool body and restricts movement of the drill blade in a backward direction.   The fluid removal tool according to claim 1, wherein the fluid disposed in the container is an oil containing PCB (polychlorinated biphenyl).   The fluid removal tool according to claim 1 or 2, wherein the locking member is disposed in the space. A stud bolt for fixing the tool body to the container;
The fluid removal tool according to any one of claims 1 to 3, wherein the stud bolt is connected to the container by electric resistance welding.   5. The fluid drainage tool according to claim 1, further comprising a first seal member that is provided in the through hole and seals between the tool main body and the drill blade. 6. A second seal member provided in the through-hole and disposed on the opposite side of the space with respect to the first seal member in the axial direction of the drill blade;
In a state where the movement of the drill blade in the forward direction is restricted by the locking member, the distance between the tip portion and the first seal member is L1, and the locking member moves the drill blade in the backward direction. The fluid removal tool according to claim 5, wherein the relationship of L1 <L2 is satisfied when a distance between the tip portion and the second seal member is L2 in a state where movement is restricted. The tool body includes an end surface that defines the space and is continuous with the through hole,
The locking member is provided on the drill blade,
When the locking member and the end face abut, the movement of the drill blade in the backward direction is restricted,
The fluid drainage tool according to any one of claims 1 to 6, further comprising a third seal member sandwiched between the abutting locking member and the end face. The drill blade includes a rear end portion protruding to the outside of the tool body, and
A cover member covering the rear end;
The fluid removal tool according to any one of claims 1 to 7, further comprising a fourth seal member that is provided apart from the drill blade and seals between the cover member and the tool main body.   The fluid removal tool according to any one of claims 1 to 8, further comprising a capturing unit that is disposed in the space and captures cutting waste generated when a container is drilled. The container is formed from a magnetic material;
The fluid removal tool according to claim 9, wherein the capture unit includes a magnet. The tool body includes a collar portion disposed to face the mounting surface of the container, and
A spacer member disposed between the mounting surface of the container and the flange,
A first hole having a relatively large diameter is formed in the flange portion, and a first hole having a relatively large diameter is formed, and a second hole having a relatively small diameter in which the drill blade is inserted in the spacer member. Is formed, and
The fluid removal tool according to any one of claims 1 to 10, further comprising a packing sandwiched between an attachment surface of a container and the spacer member. A stud bolt that is provided on a mounting surface of the container and fixes the tool body to the container;
A nut screwed into the stud bolt;
A washer for receiving the nut;
An abutting member provided on the tool body and against which the washer abuts;
The fluid drainage tool according to any one of claims 1 to 11, wherein the washer and the contact member include curved surfaces that are in surface contact with each other.

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