JP4728126B2 - Tank cleaning method and tank foreign matter adsorber - Google Patents

Description

  The present invention relates to a tank cleaning method for cleaning a tank with a cleaning liquid in a manufacturing process of a fuel tank or the like in a construction machine such as a bulldozer, and a tank foreign matter adsorber used in the cleaning method. .

  In general, a fuel tank in a large construction machine has an outer wall formed in a predetermined container shape by welding a plurality of metal plates, and a plurality of reinforcing plates for maintaining the shape inside the outer wall. Etc. are fixed by welding. When manufacturing the fuel tank, for example, a foreign matter made of an oxide such as spatter, that is, a magnetic material is generated by welding, so that the foreign matter does not enter the engine or the like when the fuel tank is mounted on a vehicle. It was necessary to clean and remove foreign substances from the tank.

  On the other hand, as disclosed in Patent Document 1, an omnidirectional rotating nozzle is inserted into the tank, the cleaning liquid is pressure-injected into the tank from the nozzle, and foreign matter such as spatter adhering to the tank is dropped, A method of discharging and removing the foreign matter together with the cleaning liquid from the drain port of the tank has been conventionally proposed.

Also, inject the cleaning liquid into the tank and seal the tank. In this state, the tank is swung or inverted, and the foreign matter remaining in the tank is washed away with the cleaning liquid. A method of discharging from the drain port of the tank has also been conventionally performed.
JP-A-5-253553

  However, these conventional cleaning methods have the following problems. That is, the method described in Patent Document 1 is intended for a small tank, and when the tank is large, particularly when an opening such as a fuel filler port into which an omnidirectional rotating nozzle is inserted is arranged biased. In this case, since the nozzles are unevenly arranged in the tank, it is difficult to spray the cleaning liquid on the entire inner peripheral surface of the tank by high pressure injection, and the foreign matter adhering to the inside of the tank is effectively cleaned. It could not be removed. In addition, as described above, since a plurality of reinforcing plates and frames are welded and fixed in the large tank, the method described in Patent Document 1 is obstructed by the reinforcing plates and the frames, and is rotated in all directions. The cleaning liquid cannot be sprayed from the nozzle to the entire inner surface of the outer wall of the tank.

  On the other hand, in the method in which the tank is swung or inverted while the cleaning liquid is injected into the tank, foreign matter, particularly high specific gravity, is generated when the movement of the tank is stopped to discharge the cleaning liquid from the drain port of the tank after cleaning. Foreign matter is precipitated. For this reason, after the cleaning liquid is discharged, the foreign matters remain in the corners and gaps between the reinforcing plate and the outer wall and are not removed. For this reason, it is common to repeat cleaning with disposal of cleaning liquid after cleaning and injection of new cleaning liquid multiple times, but even if it takes such trouble, many foreign matters remain, Effective cleaning was not possible.

  In order to solve these problems, a method of immersing the inner peripheral surface of the tank to fix the foreign matter with a coating film has been performed. In addition to being troublesome, a new problem of peeling of the coating film has arisen.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a tank cleaning method capable of effectively cleaning and removing magnetic foreign matters generated during the manufacture of the tank from the tank.

In order to achieve the above object, the present invention relating to a tank cleaning method is characterized in that, in the tank cleaning method for cleaning the inside of the tank with a cleaning liquid, an oil supply port formed on the outer wall of the tank, an oil amount sensor mounting port, And by attaching a cap with one end of the magnet fixed to the inner surface to the opening selected from the drain port, the magnet is attached to the inside of the tank and the cleaning liquid is injected into the tank to seal the tank In this state, the tank is swung for cleaning, the magnetic foreign matter in the tank is attracted to the magnet, and then the cleaning liquid is discharged and the magnet is removed from the tank. Here, the swinging means movement of the entire tank, such as turning the tank into which the cleaning liquid is injected or turning it upside down for cleaning the tank.

  Therefore, according to this cleaning method, when the tank is swung, the magnetic foreign matter adhering to the inner surface of the tank is washed away by the cleaning liquid and is attracted to the magnet. Therefore, by subsequently discharging the cleaning liquid and removing the magnet from the tank, the magnetic foreign matter can be effectively removed from the tank while being attracted to the magnet.

  In the above cleaning method, when the tank is a fuel tank, if a petroleum solvent is used as the cleaning liquid, it can be used as it is as a fuel tank without performing a removal process of the residual cleaning liquid after the cleaning. Here, the petroleum-based solvent means kerosene, kerosene, light oil, or a solvent using at least one of them as a raw material base material.

If a permanent magnet is used as the magnet, the structure is simple, the power supply equipment is not required, and handling is easy.
If the synthetic resin sheet is removed from the magnet by detachably covering the magnet so that the surface of the magnet is not exposed, the magnetic foreign matter adsorbed on the magnet can be easily removed from the magnet.

If the tank is vibrated when the tank is swung, the magnetic foreign matter can be more reliably attracted to the magnet.
In the invention relating to the foreign matter adsorbing device for tanks, a cap that can be attached to and detached from an opening selected from an oil supply port, an oil amount sensor mounting port, and a drain port formed on the outer wall of the tank , and seals the opening in the mounted state; And a magnet which is fixed to the cap and is located inside the tank with the cap attached to the opening. The magnet is adapted to adsorb magnetic foreign matter in the tank.

Therefore, by using such a tank foreign matter adsorbing tool, magnetic foreign matter can be removed without changing the structure of the tank using the opening of the tank outer wall.
If a protective member for preventing the magnet from adsorbing to the tank is provided on the cap, the magnet can be prevented from being adsorbed to a part of the tank, and handling for attaching and detaching the magnet becomes easy.

If the protective member is a rod parallel to the elongated magnet, it is possible to effectively prevent the magnet from being attracted to a part of the tank.
If the protective member is made of a nonmagnetic material, the magnet can be more effectively prevented from being adsorbed to a part of the tank.

  As described above, according to the present invention, it is possible to effectively remove magnetic foreign matters generated during the manufacture of the tank from the tank.

Hereinafter, an embodiment in which the present invention is embodied in a fuel tank cleaning method in a bulldozer, for example, will be described with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 to 3, in the fuel tank 11 used in the cleaning method of the first embodiment, a plurality of metal plates 12 a, 12 b, 12 c, 12 d, and 12 e are connected to each other at their opposing edges. By welding, the outer wall 12 is formed in a predetermined shape. A plurality of reinforcing plates 13 for holding the shape of the tank 11 are welded and fixed to the inner side surface of the outer wall 12 at predetermined intervals. The reinforcing plates 13 have a plurality of through holes for fuel passage and weight reduction. 14 is formed. Reinforcement frames 15 and 16 having a channel shape or an angled cross section for reinforcing the same portion are welded and fixed to the bottom inner surface and the front inner surface of the outer wall 12.

  As shown in FIGS. 1 to 3, a cylindrical oil supply port 17 is provided through the top of the outer wall 12 of the tank 11, and a screw portion 18 is formed on the outer periphery of the tip of the oil supply port 17. Normally, that is, when the tank 11 is used as a fuel tank, a cap (not shown) is screwed into the screw portion 18 so that the fuel filler port 17 is closed. Further, the fuel can be poured into the tank 11 through the fuel filler port 17 with the cap removed from the screw portion 18 of the fuel filler port 17.

  As shown in FIGS. 1, 2, and 5, a cylindrical oil amount sensor mounting port 19 is provided in a side portion of the outer wall 12 of the tank 11, and a plurality of screw holes 20 are formed on the outer surface side thereof. Has been. An oil amount sensor (not shown) for measuring the amount of fuel stored in the tank 11 is inserted into the oil amount sensor mounting port 19 and fixed by a plurality of bolts screwed into the screw holes 20. It has become so.

  As shown in FIGS. 1, 2, and 7, a recess 21 is formed at the bottom of the outer wall 12 of the tank 11. A cylindrical drain port 22 is provided through the bottom surface of the recess 21, and a screw portion 23 is formed on the inner peripheral surface of the drain port 22. Normally, the drain port 22 is closed by screwing a cap (not shown) to the screw portion 23. Further, the fuel in the tank 11 can be extracted through the drain port 22 in a state where the cap is removed from the screw portion 23 of the drain port 22.

Next, a cleaning method for cleaning the inside of the tank 11 in the manufacturing process of the tank 11 having the above-described configuration will be described.
At the time of cleaning the tank 11, as shown in FIGS. 1 and 2, the oil amount sensor mounting port 19 and the drain port 22 as openings provided in the outer wall 12 of the tank 11 are long and made of permanent magnets. By attaching 34 and 38 provided with magnets 27 and 28 in the shape, respectively, the oil amount sensor attachment port 19 and the drain port 22 are closed. Next, a cleaning liquid 29 made of a petroleum solvent is injected into the tank 11 from the fuel filler port 17. Then, by attaching a cap 30 provided with a long magnet 26 made of a permanent magnet to the oil supply port 17 as an opening, the oil supply port 17 is closed and the tank 11 is sealed. The cleaning liquid 29 may be a small amount of 1 or less, which is several tens of the tank volume.

  That is, as shown in FIGS. 2 to 4, one end portion of a long magnet 26 is fixed to the inner surface of the cap 30 attached to the fuel filler port 17, and a screw is attached to the inner peripheral surface of the cap 30. A portion 31 is formed, and an operating rod 32 is projected from the outer peripheral surface. A bag 33 made of a synthetic resin sheet is detachably attached to the outside of the magnet 26. Then, the screw portion 31 of the cap 30 is screwed into the screw portion 18 of the oil filler port 17 by rotating the cap 30 via the operation rod 32 in a state where the magnet 26 is inserted into the oil filler port 17. As a result, the magnet 26 is attached to the fuel filler port 17, and the fuel filler port 17 is closed by the cap 30.

  As shown in FIGS. 2, 5, and 6, one end of a long magnet 27 is fixed to the inner surface of the cap 34 attached to the oil amount sensor mounting port 19, and a plurality of caps 34 are attached to the cap 34. The bolt insertion hole 35 is formed. A bag 36 made of a synthetic resin sheet is detachably attached to the outside of the magnet 27. Then, with the magnet 27 fitted in the oil amount sensor mounting port 19, the bolts 37 are screwed into the screw holes 20 on the oil amount sensor mounting port 19 through the bolt insertion holes 35 of the cap 34. The magnet 27 is attached to the oil amount sensor mounting port 19, and the oil amount sensor mounting port 19 is closed by the cap 34.

  As shown in FIGS. 2, 7, and 8, an elongated cap 38 is fixed to the inner surface of the bolt-shaped cap 38 attached to the drain port 22, and the base outer peripheral surface of the cap 38 is fixed to the inner surface of the cap 38. A screw part 39 is formed. A bag 40 made of a synthetic resin sheet is detachably attached to the outside of the magnet 28. Then, by rotating the cap 38 with the magnet 28 fitted in the drain port 22, the screw portion 39 of the cap 38 is screwed into the screw portion 23 of the drain port 22, and the magnet 28 is connected to the drain port 22. At the same time, the drain port 22 is closed by the cap 38.

  In this manner, when the magnets 26 to 28 are attached to the tank 11 and the cleaning liquid 29 is injected into the tank 11 and the tank 11 is hermetically sealed, the tank 11 is swung as shown in FIG. 43 is set. In this swing inverting device 43, a swing frame 45 is supported on a base 44 so as to be swingable about a support shaft 46. A reversal support frame 47 is supported on the swing frame 45 so as to be reversible via a rotation shaft 48, and a set portion 49 for setting the tank 11 is provided on the reversal support frame 47. A vibrator 50 for applying vibration to the tank 11 is disposed on the upper surface of the reverse support frame 47.

  Then, with the tank 11 set on the reverse support frame 47, the swing frame 45 is swung around the support shaft 46 by a driving source such as a motor (not shown), and the reverse support frame 47 is By reversing around the rotating shaft 48, the tank 11 is reversed while being swung. Thereby, the cleaning liquid 29 flows over the entire inside of the outer wall 12 of the tank 11, and foreign matters including magnetic foreign matters adhering to the inner peripheral surface and the like of the outer wall 12 are washed away. Further, when the tank 11 is swung and inverted, vibration is applied to the tank 11 by the vibrator 50. For this reason, even if foreign matter is accumulated in the corners such as the welded portions of the reinforcing plate 13 and the reinforcing frames 15 and 16 with respect to the inner surface of the outer wall 12 of the tank 11, the foreign matter can be effectively washed away. The washed-out magnetic foreign matter is attracted and captured by the magnets 26 to 28 attached to the oil supply port 17, the oil amount sensor attachment port 19, and the drain port 22.

  Then, after performing this cleaning operation for a predetermined time, the magnets 26, 27, and 28 are removed together with the caps 30, 34, and 38 from the oil supply port 17, the oil amount sensor attachment port 19, and the drain port 22. Then, the cleaning liquid 29 is sucked and discharged from the tank 11 through the oil supply port 17 and the oil amount sensor mounting port 19 and the like. As a result, the magnetic foreign matter inside the tank 11 can be effectively removed without remaining in the tank 11 while being attracted to the magnets 26 to 28.

  Further, in this case, resin bags 33, 36, and 40 are detachably covered on the outer sides of the magnets 26 to 28, and magnetic foreign matters are attracted to the magnets 26 to 28 via the bags 33, 36, and 40. It is in the state that was done. For this reason, by removing the bags 33, 36, and 40 from the magnets 26 to 28 outside the tank 11, the magnetic foreign matter can be easily removed from the magnets 26 to 28. Therefore, if the bags 33, 36, and 40 on which the magnetic foreign matters are not attached to the magnets 26 to 28 are covered again, it is possible to prepare for the next tank cleaning.

The embodiment described above has the following effects.
Unlike the conventional method in which the tank is swung and washed off, when the cleaning liquid is discharged after cleaning, the magnetic foreign matter is adsorbed by the magnets 26 to 28 and hardly remains in the cleaning liquid. Therefore, even if the cleaning liquid is discharged, it is possible to effectively prevent the magnetic foreign matter from being accumulated. In this way, the magnetic foreign matter in the tank 11 can be effectively cleaned, and inconveniences such as engine troubles can be prevented before the tank 11 is used as a fuel tank.

-Since petroleum-based solvent such as kerosene is used as the cleaning liquid, it can be used as a fuel tank as it is without removing the residual cleaning liquid after the tank 11 is cleaned.
The magnets 26 to 28 are supported by the caps 30, 34, and 38, respectively, and the caps 30, 34, and 38 are attached to the fuel filler opening 17 of the tank 11 in a closed state, so that the magnets 26 to 28 are placed inside the tank 11. Therefore, it is not necessary to change the structure of the tank 11, and since permanent magnets are used as the magnets 26 to 28, no power supply facility is required and magnetic foreign matters can be easily removed.

  Since the magnets 26 to 28 are covered with a bag 36 made of a synthetic resin sheet so that the surface thereof is not exposed, if the bag 36 is removed from the magnets 26 to 28, the magnets adsorbed to the magnets 26 to 28 The foreign matter can be easily removed from the magnets 26 to 28, which is useful for improving the efficiency of the cleaning operation.

  Since vibration is applied to the tank 11 when the tank 11 is swung by the vibrator 50, the magnetic foreign matter can be more reliably attracted to the magnets 26 to 28.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment.
As shown in FIGS. 9A and 9B and FIGS. 10A and 10B, in the second embodiment, on the inner surfaces of the caps 30 and 34 for the oil supply port 17 and the oil amount sensor mounting port 19, A protective rod 51 made of a nonmagnetic material such as aluminum as a protective member is erected and fixed. In the example of FIGS. 9A, 9B, and 10A, 10B, the protective rod 51 is sandwiched between the elongated magnets 26, 27 with a gap therebetween. Two are arranged. Further, the protective rod 51 is slightly longer than the magnets 26 and 27.

  Therefore, in the second embodiment, when the protective rod 51 is applied to the inner peripheral surface of the fuel filler port 17 or the like when the magnets 26 and 27 are attached or detached, the magnets 26 and 27 are attracted to the inner peripheral surface of the fuel filler port 17 or the like. Can be prevented. For this reason, even if it uses what has a strong magnetic force as the magnets 26 and 27, the handling of the magnets 26 and 27 becomes easy and a magnetic foreign material can be removed more reliably.

  The number of the protective rods 51 is not limited to two, but may be one or three, or may be four as shown in FIGS. 9B and 10B. If the number of the protective rods 51 is large, the adsorption of the magnets 26 and 27 to the tank 11 can be prevented more reliably.

(Example of change)
Each of the above embodiments can be modified and embodied as follows.
In the embodiment, the magnets 26 to 28 are attached to the oil supply port 17, the oil amount sensor mounting port 19, and the drain port 22 as openings formed in the outer wall 12 of the tank 11. A magnet is attached to the opening formed in the wall of the reinforcing plate 13 or the like.

  In the above-described embodiment, the fuel tank cleaning method in the bulldozer is embodied, but the fuel tank in other construction machines such as a hydraulic excavator or the tank cleaning method for other applications is embodied. thing.

  -Use electromagnets as magnets 26-28.

The front view which shows the washing | cleaning method of the tank of 1st Embodiment. Sectional drawing which expands and shows the tank of FIG. The expanded sectional view in the 3-3 line of FIG. The perspective view which shows the magnet with which the oil filler opening of a tank is mounted | worn. FIG. 5 is an enlarged sectional view taken along line 5-5 in FIG. The perspective view which shows the magnet with which the oil quantity sensor attachment port of a tank is mounted | worn. The expanded sectional view in the 7-7 line of FIG. The perspective view which shows the magnet with which the drain port of a tank is mounted | worn. (A), (b) is the perspective view and bottom view which respectively show 2nd Embodiment. (A), (b) is the perspective view and bottom view which respectively show 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Tank, 12 ... Outer wall, 13 ... Reinforcement plate, 15, 16 ... Reinforcement frame, 17 ... Oil supply port as opening, 19 ... Oil amount sensor attachment port as opening, 22 ... Drain port as opening, 26, 27, 28 ... magnet, 29 ... cleaning solution, 30, 34, 38 ... cap, 43 ... swing reversing device, 45 ... swing frame, 47 ... reverse support frame, 50 ... vibrator, 51 ... protection as a protective means rod.

Claims (9)

In the tank cleaning method for cleaning the tank with cleaning liquid,
By attaching a cap with one end of the magnet fixed to the inner surface to the opening selected from the oil supply port, oil amount sensor mounting port, and drain port formed on the outer wall of the tank, the magnet is installed inside the tank. At the same time, the cleaning liquid is poured into the tank, the tank is sealed, and in this state, the tank is swung for cleaning, the magnetic foreign matter in the tank is adsorbed by the magnet, and then the cleaning liquid is discharged. And cleaning the tank, wherein the magnet is removed from the tank. 2. The tank cleaning method according to claim 1, wherein the tank is a fuel tank, and a petroleum solvent is used as the cleaning liquid. The method of cleaning tank according to claim 1 or claim 2 characterized by using a permanent magnet as the magnet. The tank cleaning method according to any one of claims 1 to 3 , wherein the magnet is detachably covered with a synthetic resin sheet so that a surface thereof is not exposed. The tank cleaning method according to any one of claims 1 to 4 , wherein vibration is applied to the tank when the tank swings. A cap that can be attached to and detached from an opening selected from an oil supply port, an oil amount sensor mounting port, and a drain port formed on the outer wall of the tank , and seals the opening in a mounted state;
A magnet fixed to the cap and positioned inside the tank with the cap attached to the opening;
A foreign matter adsorbing tool for a tank, wherein the magnetic foreign matter in the tank is attracted by the magnet. The tank foreign matter adsorbing tool according to claim 6 , wherein the cap is provided with a protective member for preventing the magnet from adsorbing to the tank. 8. The tank foreign matter adsorbing tool according to claim 7 , wherein the magnet has a long shape, and the protective member is a rod provided so as to be parallel to the magnet. The tank foreign matter adsorbing tool according to claim 7 or 8 , wherein the protective member is made of a non-magnetic material.

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