JP4130215B1 - Pipe assembly storage rack - Google Patents

Abstract

An object of the present invention is to provide a pipe assembly-type storage shelf that is excellent in corrosion resistance and has no environmental problems in the processing and disposal of mill ends.
The pipe 1 is used in a pipe assembly type storage shelf in which various types of storage shelves can be manufactured according to needs by connecting the pipe 1 with joint members 2 and 3 and fastening members 5 and 6 illustrated in the figure. The pipe 1 is manufactured by welding from a steel plate having a surface plated with zinc, aluminum and magnesium, and then coated with a thin film of an organic solvent. In addition, it is possible to provide a pipe-assembled storage shelf that has high corrosion resistance on the surface of the cut end surface portion and that does not cause environmental problems during end material processing or disposal of the storage shelf.
[Selection] Figure 1

Description

  The present invention relates to an assembly-type storage shelf that stores factory equipment and the like, and more particularly, to a pipe assembly-type storage shelf that combines and assembles pipes with a dedicated joint.

  The pipe assembly type storage shelf is composed of a pipe that is a frame member and a joint for assembling the pipe, and by combining these, racks of various shapes can be easily manufactured without using welding or the like. (Patent Document 1). The rack or the like is used, for example, for storing parts or the like in a manufacturing and assembly factory such as an automobile, or as a production assembly base and a transport carriage.

  An example of a pipe and a joint is shown in FIGS. The joint includes a member having a recess into which an end or an intermediate part of the pipe is fitted, and a fastening member for fixing the members to which the pipe is fitted, and an intermediate part or an end of the pipe. Other pipes can be easily and firmly connected to each other, and racks of various shapes and dimensions can be manufactured in a short time according to the needs of the manufacturing site. The rack can be easily moved by attaching wheels to the lower part, which is useful for improving work efficiency at the manufacturing site.

Conventionally, the above-described pipe assembly-type storage shelves used at manufacturing sites have used plastic coated pipes as pipes from the viewpoint of corrosion resistance and aesthetics. The plastic-coated pipe is obtained by coating the outer surface of a metal pipe with a plastic layer with an adhesive, and has an aesthetic advantage that it has excellent corrosion resistance and can have various colored surfaces.
JP 2001-286350 A

  However, the conventional pipe assembly type storage shelf has an environmental problem because it is difficult to remove the plastic layer of the pipe in the processing of the scraps produced at the time of manufacture or the processing at the time of disposal. That is, if the plastic layer remains attached, the disposal or recycling process cannot be performed due to environmental problems, and the cost of removing the plastic layer is excessive as described above. It was.

  As a solution to this problem, the inventors examined a method that eliminates the need for plastic coating by using a pipe made of a plated steel sheet, which will be described later. However, it is excellent in surface performance such as corrosion resistance and hardness, and is unavoidably attached to the pipe surface at the stage of manufacturing the pipe from the above-mentioned plated steel pipe, even though it is a promising alternative to the conventional pipe. Due to the oil, a new problem has arisen that the assembly by the joint has a problem. If the oil component adhering to the pipe surface cannot be efficiently removed within a profitable range, a pipe manufactured from the plated steel sheet cannot be used in practice.

  The present invention uses a pipe subjected to a plating process having corrosion resistance superior to that of a conventional plating process, and further solves the technical problems associated therewith, thereby eliminating the environmental problems described above. It is an object of the present invention to provide a pipe assembly type storage shelf that can be easily assembled as usual, has excellent corrosion resistance, is strong, and has no environmental problems.

In order to solve the above-mentioned problems, according to the first aspect of the present invention, there is provided a pipe assembling storage shelf in which pipes are joined and assembled by a joint. The pipe has zinc on the surface, 6 weight percent aluminum, and 3 weight percent. It is formed from a steel plate that has been subjected to hot dipping with magnesium as a constituent component, and oil is removed from the pipe surface . As a result, it is possible to obtain a pipe with high corrosion resistance for a long time without coating the surface with plastic, and to obtain a pipe with no oil content on the surface. There is no problem, and it is possible to provide a pipe-assembled storage shelf that is excellent in corrosion resistance as before and can be easily assembled.
The invention described in claim 2 is characterized in that the removal of oil from the pipe surface is performed by coating the pipe surface with a film of an organic solvent. Thereby, the oil component on the pipe surface can be efficiently and sufficiently removed, and problems during assembly can be prevented.
The invention according to claim 3 is further characterized in that the pipe has an outer diameter of 27.8 mm. As a result, the conventional joint can be used, and resources can be saved and waste can be reduced.
The invention described in claim 4 is further characterized in that the steel plate is a carbon steel plate in which the strength of the pipe is equivalent to JISG3445, STKM11A to 20A. Thereby, it can be set as the pipe assembly-type storage shelf which has sufficient bending strength and does not easily damage the pipe surface.

  By the means for solving the above, the pipe-assembled storage shelf of the present invention has no environmental problems when processing offcuts or discarding the storage shelf, and is still durable and excellent in corrosion resistance, and easily with an existing joint. Can be assembled.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the surface treatment of a steel plate for pipe production, which is a feature of this pipe assembly type storage shelf, will be described.

  FIG. 3 is a view for explaining a mechanism for inhibiting corrosion on the surface of a ZAM-plated steel sheet used as a material for the pipe of this embodiment. On the further surface side of the plating layer (ZAM plating layer) of this example composed of Zn-Al-Mg components plated by dipping on a steel substrate, a dense Mg-containing Zn-Al-based protective coating and the protective coating Further, a dense Mg-containing Zn-based protective film is formed on the surface side with time. This is the difference between the ZAM plating layer and the conventional plating layer, and the surface of the ZAM plating layer becomes more difficult to corrode due to the two new high corrosion-resistant plating films that occur over time.

  The ZAM-plated steel sheet exhibits corrosion resistance 10 to 20 times that of a later-described hot-dip Zn-plated steel sheet and 5 to 8 times that of a hot-dip Zn-5% Al alloy-plated steel sheet. Further, the ZAM plating layer is harder than the normal hot-dip Zn plating layer, and has excellent wear resistance and scratch resistance. Hereinafter, the pipe of the present Example manufactured by welding from said ZAM plating steel plate is described as a ZAM pipe.

  FIG. 4 shows a graph representing the red rust generation cycle when the Mg content is increased from zero to 3% in the ZAM plating layer. This is a result of a combined cycle corrosion test (CCT: JASO M609-91) in which salt spraying, drying, and wetting conditions are repeated as one cycle. The test piece conditions include a coating adhesion amount of 90 g / m 2 and an Al content. This was carried out at a constant 6 mass%. From this figure, it can be seen that, in this component range, the higher the Mg content, the greater the suppression of red rust generation.

FIG. 5 shows that in the salt spray test test (SST: JISZ2371) of the bent portion, the ZAM plating of this example prevents the occurrence of red rust for a long time as compared with Comparative Example 1 and Comparative Example 2. Here, Comparative Example 1 is hot dip Zn plating, and Comparative Example 2 is hot dip Zn-5% Al alloy plating. The test conditions consist of forming a plating layer of 120 g / m ² on a steel plate having a thickness of 3.2 mm under each plating condition, and performing the above-mentioned salt spray test on a test piece that was bent at 180 ° with a load of 1 t. is there. In order to produce a pipe with a steel plate after plating, a comparison was made in this test.

  In the pipe manufactured with the plated steel plate shown in Comparative Example 1 or Comparative Example 2, the corrosion resistance is insufficient in a high-humidity environment at the manufacturing site, and cannot be a substitute for the conventional plastic-coated pipe. This pipe-assembled storage shelf adopts a welded steel pipe made of the above ZAM plated steel plate, so it can have high corrosion resistance and surface aesthetics, so the above-mentioned alternative that has removed the environmental disadvantages of conventional pipes It can be used as a product.

  Moreover, although not shown in figure, a ZAM plating steel plate shows the corrosion resistance outstanding also in the welding part compared with the hot-dip Zn-5% Al alloy plating steel plate of the said comparative example 2 of the said conditions. This is presumably because Mg in the plating layer was eluted into the metal layer of the welded portion and exhibited an excellent protective film effect. Thereby, it was confirmed that the pipe manufactured with the ZAM plated steel sheet has no problem in corrosion resistance even in the welded portion.

  FIG. 6 is a diagram for explaining a mechanism by which ZAM plating improves corrosion resistance even on a cut surface of a steel sheet, and schematically shows a cut portion of the ZAM-plated steel sheet. When the ZAM-plated steel sheet is cut, as shown in FIG. 6 (a), the exposed steel substrate at the end face is oxidized and ZAM-plated at the cut surface as shown in FIG. There is no particular change in the steel plate surface. In the middle stage of exposure after several weeks since cutting, as shown in FIG. 6 (b), the cut surface is covered with a dense Mg-containing Zn-based protective film flowing from the dripping part, and gradually turns from gray to grayish black To change. Furthermore, when it becomes the exposure long-term stage which passed for one year or more since it cut | disconnected, not only a cut surface but the steel plate surface part will be covered with a precise | minute Mg containing Zn type protective film.

  As described above, in ZAM plating, due to the effects of Mg and Al contained in the plating layer, a two-layer protective film having a dense and strong adhesion is formed on the plating surface and the cut surface with the passage of time. Therefore, it exhibits excellent anticorrosive properties. In this pipe assembly type storage shelf, the user cuts the pipes of the standard size (2m, 4m) into the required length, and thus the corrosion protection of the cut surface has been a big problem. This problem was solved by adopting the ZAM pipe having.

  Here, when a general steel plate is used as the ZAM-plated steel plate, the pipe strength becomes insufficient, and bending tends to occur when used in a rack or the like, and it is difficult to restore the pipe once bent. Therefore, in this embodiment, a carbon steel sheet having a pipe strength equivalent to JISG3445 and STKM11A to 20A is used as a steel sheet to be ZAM plated. Thereby, it can be set as the pipe assembly-type storage shelf which has sufficient bending strength and a pipe surface is hard to be damaged.

Next, the oil removal of the pipe surface, which is another feature of the pipe assembly type storage shelf, will be described.
As described above, this pipe assembly-type storage shelf uses a ZAM pipe, so that it is excellent in environmental performance with respect to the processing of the pipe end material generated at the time of manufacturing the storage shelf and the pipe processing at the time of disposal It can be suitable for recycling. However, at the time of assembling the storage shelf, the friction coefficient of the pipe surface is reduced by a small amount of oil adhering to the pipe surface in the pipe making process from the ZAM-treated steel plate, and the pipe is firmly bonded by the joint. There was a problem that it was impossible.

  Several methods were considered to remove the oil, but manual wiping is not possible in terms of efficiency and cost, and the surface treatment agent for the pipe and the plating itself can be removed for the method of soaking in an alkaline degreasing solution. The problem that the effect of the above-mentioned degreasing liquid is different between the welded part of the pipe and the other pipe part, and furthermore, since drying after degreasing is performed in a bundled state, drying of the contact part between the pipes becomes insufficient. There were various problems such as the problem that streaky salt remained in the pipe.

In the following, a method found by the inventors will be described as a measure for solving the above-mentioned various problems relating to degreasing of the ZAM pipe surface.
This method is a method called “dry coating”, in which the surface of a pipe is coated with a thin organic solvent film (thickness of several microns) by spraying an organic solvent vapor. The oil component is removed during the coating process, and the coated organic coating itself does not reduce the coefficient of friction like the oil component, so that the pipes can be firmly connected to each other according to the specifications.

  This “dry coat” was previously used in steel pipes for agricultural greenhouses, and here it was used for general cleaning purposes and was used for degreasing as in this case. It was not envisaged and there were no examples of actual adoption. By adopting this treatment method as a method of degreasing the pipes used in the pipe-assembled storage shelf, it has become possible in practice to automatically produce the storage shelf pipe.

  As described above, according to the present invention, a welded pipe manufactured from the ZAM-plated steel sheet is adopted, and the oil adhering to the surface at the time of manufacturing the pipe is removed by the dry coating process, so that the plastic is not coated. Since the pipe can be a hard and scratch-resistant pipe having high corrosion resistance and sufficient bending strength, a pipe-assembled storage shelf that does not cause the environmental problems can be provided.

It is a figure which shows an example of the assembly of the pipe and joint of the pipe assembly-type storage shelf of this invention, (a) is an exploded perspective view of a joint, (b) is an assembly perspective view of a pipe and a joint. It is a figure which shows another example of the assembly of the pipe and joint of the pipe assembly-type storage shelf of this invention, (a) is an exploded perspective view of a joint, (b) is an assembly perspective view of a pipe and a joint. It is a schematic diagram of the cross section of a ZAM plating steel plate. It is a figure which shows the relationship between Mg content rate in a plating layer, and red rust generation | occurrence | production time. It is a figure which shows the red rust generation | occurrence | production situation of the 1t bending process part by a salt spray test. It is a schematic diagram of the cut end face part of a ZAM plating steel plate, (a) shows the initial stage of exposure, (b) shows the middle period of exposure, and (c) shows the state of the long exposure period.

Explanation of symbols

1 Pipe 2, 3, 4 Joint member 5 Bolt 6 Nut 7 ZAM plating layer 8 Mg-containing Zn-based protective coating

Claims (4)

In a pipe assembly-type storage shelf that is assembled by connecting pipes with joints,
The pipe is formed of a steel plate on the surface of which zinc, 6% by weight of aluminum, and 3% by weight of magnesium are subjected to hot dipping, and oil is removed from the pipe surface. <br/> Pipe assembly storage shelf characterized by the above. The pipe assembly-type storage shelf according to claim 1, wherein the removal of oil from the pipe surface is performed by coating the pipe surface with a film of an organic solvent. The pipe assembly-type storage shelf according to claim 1 or 2 , wherein the pipe has an outer diameter of 27.8 mm. The pipe assembling-type storage shelf according to any one of claims 1 to 3, wherein the steel plate is a carbon steel plate having a strength of the pipe equivalent to JISG3445 and STKM11A to 20A.

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