KR102649808B1 - Installation method of hoist crane for logistics transportation facility - Google Patents

Abstract

The method of installing a hoist crane for a logistics transfer facility according to the present invention includes a first step of standing and installing a pair of left and right support frames in a logistics transfer facility; A second step of preparing a plurality of unit blocks having various lengths and then selecting a specific number of unit blocks matching the length between the support frames; A third step of manufacturing the upper plate, lower plate, and side plate by butt welding the selected unit blocks; A fourth step of manufacturing a girder by welding the upper plate, lower plate, and side plates; A fifth step of manufacturing a hoist crane by installing the girder on the support frame and then installing a hoist on the girder.
According to the method of installing a hoist crane for a logistics transfer facility according to the present invention, the unit blocks are selected according to the measurement dimensions required by the logistics transfer facility, the upper plate, lower plate, and side plates are assembled, and then they are welded to improve convenience of assembly and manufacturing. It has advantages that can be pursued.

Description

{Installation method of hoist crane for logistics transportation facility}

The present invention relates to a method of installing a hoist crane for a logistics transfer facility. More specifically, when installing a hoist crane in a logistics transfer facility, the girder, which is the longest component, is divided into unit blocks for each bottom plate and side plate, and then these are selected for distribution. This relates to a method of installing a hoist crane that provides characteristics that enable convenience of assembly and manufacturing by welding to the dimensions measured at the transfer facility.

A hoist crane provides the function of transporting logistics such as cargo while hoisting/unloading, and refers to a device including a so-called 'hoist' (hoisting device).

These hoist cranes are installed in logistics transfer facilities and can not only lift and unload materials, but also move them vertically and horizontally in various ways.

These hoist cranes may be installed in permanent logistics transfer facilities, but they are also often installed in temporary logistics transfer facilities. In such temporary logistics transfer facilities, the process of installing and disassembling hoist cranes stably and efficiently is important. .

Domestic Patent No. 2549807, a batch replacement device for multiple drive roll assemblies in a steel pipe forming or shaping process and a batch replacement method using the same, includes a composite hoist device in which an upper hoist and a lower hoist are connected via a movable beam; a hoist girder connected to the upper hoist to guide traverse movement of the composite hoist device; And to maintain the vertical balance of the composite hoist device when moving the individual drive rolls in the vertical direction using the lower hoist, a pair of supports on which one side and the other side in the longitudinal direction of the movable beam are mounted and removed, respectively. The lower hoist includes a plurality of hoists spaced apart from each other in the longitudinal direction of the movable beam by the distance between the plurality of drive roll assemblies installed in the process line, thereby performing replacement and setting operations of the drive roll assemblies. It has been revealed that the time required to do this can be significantly reduced, improving the inefficiency of having the entire line stop operating for a long time and increasing productivity.

However, since the above technology is limited to replacing the entire drive roll assembly including the hoist crane, it not only does not present an efficient process for installing the hoist crane by focusing on individual configurations, but also does not provide an efficient process for efficiently assembling especially long girders. It has the limitation of not being able to suggest any specific solution.

Therefore, when installing a hoist crane in a logistics transfer facility, the girder, which is the longest component, is divided into unit blocks for each bottom plate and side plate, and then these are selected and welded to the measurement dimensions required by the logistics transfer facility, thereby facilitating assembly and manufacturing. The reality is that there is a need to develop new and advanced hoist crane installation methods that provide features that enable convenience.

Domestic Patent No. 1644574 US Patent Publication US 11447645

The present invention was developed to overcome the problems of the above technology. When installing a hoist crane in a logistics transfer facility, the girder, which is the longest component, is divided into unit blocks for each bottom plate and side plate, and then these are selected and transported to the logistics transfer facility. The main purpose is to provide a hoist crane installation method that provides characteristics that enable convenience of assembly and manufacturing by welding according to the measured dimensions.

Another object of the present invention is to provide a method that can ensure the durability and rigidity of welded portions of unit blocks constituting a girder.

Another object of the present invention is to enhance the durability, including corrosion resistance and adhesion, of the welded area by coating a surface protective layer on the welded area immediately after welding the girder.

In order to achieve the above object, the method of installing a hoist crane for a logistics transfer facility according to the present invention includes a first step of standing and installing a pair of left and right support frames in a logistics transfer facility; A second step of preparing a plurality of unit blocks having various lengths and then selecting a specific number of unit blocks matching the length between the support frames; A third step of manufacturing the upper plate, lower plate, and side plate by butt welding the selected unit blocks; A fourth step of manufacturing a girder by welding the upper plate, lower plate, and side plates; A fifth step of manufacturing a hoist crane by installing the girder on the support frame and then installing a hoist on the girder.

In addition, the fourth step is characterized by including a process of short peening a specific area of the upper plate, lower plate, and side plate including the welded area.

In addition, between the fourth and fifth steps, a process of coating the welded area with a surface protective layer containing polyphenylene vinylene (PPV) is included.

According to the method of installing a hoist crane for a logistics transfer facility according to the present invention,

1) It has the advantage of pursuing convenience of assembly and manufacturing by selecting unit blocks according to the measurement dimensions required by the logistics transfer facility, assembling the top, bottom, and side plates, and then welding them.

2) By providing a shot peening process to the welded area of the girder, durability and compressive stress can be strengthened.

3) By coating the surface protective layer on the welded area of the girder, it provides the effect of strengthening the overall durability by strengthening the corrosion resistance and adhesion of the welded area.

Figure 1 is a conceptual diagram illustrating the schematic structure of a hoist crane installed in a logistics transfer facility.
Figure 2 is a flow chart showing the installation process of the hoist crane of the present invention.
Figure 3 is a conceptual diagram showing an embodiment of butt welding the unit block body of the present invention.
Figure 4 is a perspective view showing the structure of a girder manufactured through a welding process.
Figure 5 is a plan view showing a structure in which the girder of the present invention is installed in a double type.
Figure 6 is a flowchart showing the steps of manufacturing the surface protective layer of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The accompanying drawings are not drawn to scale, and like reference numbers in each drawing refer to like elements.

The hoist crane installation process of the present invention manufactures a girder 100 with a considerable size and load by welding a plurality of unit blocks 150, thereby providing convenience in manufacturing the girder 100 and providing space for logistics transfer. The main feature is that it can solve the problem of not providing a solution when the girder 100 pre-manufactured as a single unit does not have the correct size.

Figure 1 is a conceptual diagram illustrating the schematic structure of a hoist crane installed in a logistics transfer facility.

First, when describing the hoist crane of the present invention with reference to FIG. 1, the hoist crane provides the function of transporting logistics such as cargo while hoisting/unloading, and refers to a device including a so-called 'hoist' (hoisting device).

These hoist cranes can be derived from various structures depending on the type of hoist as well as the type of auxiliary means for installing the hoist, such as girders (100), saddles (20), brackets, rails, or support frames (10). However, in Figure 1, a specific structure is shown as an example among these various structures.

The hoist crane according to Figure 1 is erected in a pair on the left and right in a space where logistics are transported (hereinafter referred to as 'logistics transfer facility'), and includes a support frame 10 including a rail on the upper surface, and an upper surface of the support frame 10. Saddles 20 that are installed and move along the rail, and a girder that is installed on the upper surface of the saddles 20 along the length between a pair of support frames 10 and moves along the rail with the movement of the saddles 20. The basic structure includes (100) and a hoist installed on this girder (100).

Of course, the hoist crane is not limited to this structure, and includes a bracket installed between the girder 100 and the saddle 20, a stopper to stop the saddle 20 at the end of the rail, a bumper to relieve the shock generated when contacting the stopper, etc. Additional structures may be included, but since this can refer to the structure of a known hoist crane (or crane or hoist), a separate description thereof will be omitted.

In addition, the hoist is a trolley that moves along the longitudinal direction of the girder 100, a hook block including a hook for hanging materials, and winding/rewinding by driving a motor while hanging on the hook block to lift or unwind materials. It includes a main body including a wire rope, and since this is also the same or similar to the structure of a known hoist, hoisting device, or winch, a separate description will be omitted.

When these hoist cranes are installed in a logistics transfer facility, the hoist crane has a size and scale that cannot be pre-manufactured and transported as a single unit, so each configuration is transported to the logistics transfer facility and then the girder (100) and saddle ( 20), and goes through the process of assembling the support frame (10).

In particular, if the girder 100, which is longer than other detailed configurations, is manufactured as an integrated unit and is smaller or larger than the actual size measured in the field situation of the logistics transfer facility, there may be a problem that this cannot be properly solved. In order to solve this problem, by assembling and manufacturing a plurality of unit blocks 150 by welding, it is possible to open the possibility of separating the welded part and replacing it with a unit block 150 that matches the dimensions if it is different from the actual measurement. The efficient method will be explained in detail below.

Figure 2 is a flow chart showing the installation process of the hoist crane of the present invention.

As can be seen from Figure 2, the installation method of the hoist crane of the present invention is based on sequentially proceeding from the first step to the fifth step.

Although not described in the present invention, in the installation process of the hoist crane, safety design such as the logistic limit load of the hoist and the load of the support frame 10/girder 100 is involved in advance, as well as the installation process of electrical facilities. As it is natural that it is included, it is clear in advance that the first to fifth steps to be described later focus on explaining the assembly and installation process of the girder 100 in the installation of the basic structure of the hoist crane.

The first step of the present invention is to erect and install a pair of left and right support frames 10 in a logistics transfer facility.

That is, in the first step, the support frame 10, which is a basic frame capable of seating/installing the detailed configuration of the hoist crane such as the saddle 20 as well as the girder 100, which will be described later, is adjusted to the space size and logistics transfer range of the logistics transfer facility. It refers to the process of standing and installing to fit.

Here, rails are installed on the upper surface of the support frame 10 on which the saddles 20, which will be described later, can move, and in addition, auxiliary facilities such as end carriages may be installed together with the support frame 10 or installed with a time difference. You can.

The first step of the present invention is to install a support frame 10 tailored to the size and height of the installation space of the logistics transport facility as well as the purpose of logistics transport, etc., and since it is the same as the known support frame 10 installation process, a separate detailed description is required. Omit it.

Figure 3 is a conceptual diagram showing an embodiment of butt welding unit blocks of the present invention, and Figure 4 is a perspective view showing the structure of a girder manufactured through a welding process.

First, referring to FIG. 4, it can be seen that the girder 100 of the present invention has a rectangular parallelepiped shape and a structure extending long in the left and right directions, that is, a so-called box-shaped structure. This girder 100 has a rectangular parallelepiped shape. It consists of an upper plate 110, a lower plate 120, as well as four side plates 130 forming the front, rear, and left and right sides.

That is, the girder 100 of the present invention is manufactured by welding and assembling the upper plate 110, lower plate 120, and side plate 130. The upper plate 110, lower plate 120, and side plate 130 are If it is made of a single unit, the length becomes too large, making assembly difficult, and there is a problem that it is difficult to compensate when the length of the actually manufactured girder 100 is different from the actual measurement of the logistics transfer facility.

Therefore, in order to prevent this problem, the main feature is that the upper plate 110, the lower plate 120, and the side plate 130 are completed by combining a plurality of unit blocks 150 by butt welding, and for this purpose, the present invention presents the second to fourth steps.

Specifically, the second step of the present invention is to prepare a plurality of unit blocks 150 having various lengths and then selecting a specific number of unit blocks 150 that fit the length between the support frames 10. am.

In the present invention, the 'unit block body 150' is a unit divided into a plurality of units based on the longitudinal direction of the girder 100 for each upper plate 110, lower plate 120, and side plate 130. In other words, the girder 100 It can be said to be a unit that constitutes the upper plate 110, lower plate 120, or side plate 130, which is completed by combining in the longitudinal direction.

If these unit blocks 150 are divided vertically and horizontally in a matrix manner based on the upper plate 110/lower plate 120/side plate 130, not only will the number of welded parts increase, making assembly difficult, but the girder 100 Since durability may be impaired, the unit block body 150 of the present invention can be understood as a unit structure partitioned/divided in the longitudinal direction of the girder 100.

That is, in the second step of the present invention, the length (span) between the support frames 10 is prepared with a plurality of unit blocks 150 having various lengths for each of the upper plate 110, lower plate 120, and side plate 130. This is a process of selecting two or more unit blocks (150) that fit the length of.

Here, it is reasonable to interpret the length between the support frames 10 as a stable distance that can be stably installed on the pair of support frames 10, rather than meaning the exact length between the pair of support frames 10. do.

For example, if the exact length between the support frames 10 is 7m and the stability distance is 8m, three unit blocks 150 with lengths of 2.5m, 2, 5m, and 3m are selected based on the stability distance. You can.

The unit blocks 150 selected in this way are divided into the upper plate 110/lower plate 120/four-sided side plate 130, and if too many are combined, the welding process becomes difficult and the girder 100 is damaged. Since durability may be reduced, it is preferable that the upper plate 110/lower plate 120/four-sided side plate 130 be composed of 2 to 5 unit blocks 150.

In addition, as mentioned earlier, the length of the unit block body 150 is also prepared to have various lengths based on the longitudinal direction of the girder 100, so the height or thickness of the girder 100 may not vary significantly, so the girder 100 In the case of the side plate 130 in charge of the left and right sides of , it may not be prepared in various sizes but may be made of a single unit block body 150 with a specific area.

The third step of the present invention is to manufacture the upper plate 110, lower plate 120, and side plate 130 by butt welding the selected unit blocks 150.

Butt welding is a welding technique that joins two metal pieces in a linear manner along the edge. In the present invention, as shown in FIG. 3, the two metal pieces are joined along the height direction of the sides facing each other in adjacent unit blocks 150. It can be seen that butt welding is carried out in a linear manner.

The welding area where butt welding is performed in the unit block body 150 may be subjected to a pre-processing process such as beveling or chamfering for appropriate heat treatment fusion, and the welding leg length is adjusted to the length of the unit block body 150. It can be processed in various ways depending on the situation.

Such butt welding can be performed using any one of shielded metal arc welding, gas metal arc welding, gas tungsten arc welding, and flux cored arc welding, and of course, known fillers can be introduced.

Through this butt welding, molten metal is fused at the welding area of the adjacent unit block body 150 to form a solid weld pool, and as this weld pool cools, the molten metal solidifies and the adjacent unit block body 150 is formed at the welding area. A continuous and strong joint occurs along the line.

The above-described butt welding is performed to manufacture the upper plate 110, lower plate 120, and side plate 130, respectively, and finally, the upper plate 110, lower plate 120, and side plate ( 130) can be produced.

The fourth step of the present invention is to manufacture the girder 100 by welding the upper plate 110, the lower plate 120, and the side plates 130 with a specific length through butt welding.

In other words, this means that the box-shaped girder 100 is completed by forming a strong bonding relationship by welding along the contact area, that is, the edge area, between the upper plate 110, lower plate 120, and side plate 130.

At this time, various welding processes may be applied to the welding between the upper plate 110, the lower plate 120, and the side plate 130. For example, the upper plate 110, the lower plate 120, and the side plate ( 130) The Resistance Spot Welding (RSW) process that joins the welded parts between teeth can be applied.

This type of resistance spot welding does not require filler materials, and is useful in that the heat generated causes the metals at the point of contact to melt and fuse together, forming a solid joint relationship without introducing additional material.

Of course, resistance spot welding is a welding process frequently used in delicate parts, so it may not be suitable for welding for relatively long girders (100), so the widely used gas metal arc welding (GMAW) and Of course, the same welding process can be applied.

Figure 5 is a plan view showing a structure in which the girder of the present invention is installed in a double type.

The girder 100 of the present invention is made of a single type and can be applied with a structure in which a hoist is mounted on the lower part of the girder 100. However, as shown in FIG. 5, it is made of a double type arranged at regular intervals so that the hoist is mounted on the upper part of the girder 100. By installing it on, you can have a foundation to ensure more stable operation of the hoist.

This double type girder 100 can also be manufactured by going through the steps described above for each girder 100.

The fifth step of the present invention is to install the girder 100 on the support frame 10 and then install a hoist on the girder 100 to finally manufacture a hoist crane.

At this time, various finishing processes may be included, such as installing the saddle 20 between the girder 100 and the support frame 10, as well as installing electric equipment at each well along with the hoist installation.

Since this fifth step is also the same or similar to the installation process of a known hoist crane, a separate detailed description will be omitted.

In summary, the method of installing the hoist crane of the present invention is that the box-type girder 100, which is manufactured by assembling the top plate 110, the bottom plate 120, and the side plate 130, has a longer length compared to other configurations, so the top plate ( 110), the bottom plate 120, and the side plate 130 are divided into unit blocks 150, then selected and welded according to the dimensions measured at the logistics transfer facility, thereby pursuing convenience of assembly and manufacturing. provides.

Additionally, the above-described fourth step, that is, the step of manufacturing the girder 100, involves short peening a specific area of the upper plate 110, lower plate 120, and side plate 130, including the welded portion. It is possible to include

Here, the welding area can be understood to include a butt welding area between the unit block bodies 150 as well as a welding area between the upper plate 110, the lower plate 120, and the side plates 130.

Shot peening is a mechanical surface treatment that impacts a metal surface with a small spherical medium such as metal or ceramic shot. Shot peening is a mechanical surface treatment that applies metal to specific areas including the butt welded areas of the upper plate 110, lower plate 120, and side plate 130. This is a process performed by applying impact with a ball.

This shot peening provides the advantage of reducing residual stress to alleviate the problem of early fatigue occurring due to residual stress in the welded area and increasing the fatigue life of the completed girder 100 by causing compressive stress in the welded area. do.

In addition, by reducing the surface roughness of the welded area, it can smooth out irregular welded areas, alleviate cracks caused by corrosion, and improve paint or coating adhesion.

To briefly explain this shot peening process, the weld toe is first ground to remove discontinuities, and then the areas that do not require shot peening are masked.

Afterwards, shot peening is performed by applying impact to a specific area, including the weld area, using a metal ball. Shot peening parameters (shot size, strength, Almen strip reading, etc.) are set in advance and performed according to the set values.

Finally, the shot peening process can be completed by removing residual particles or foreign substances from the peened weld area, and then paint is coated on the surface of the girder 100 based on the surface finish formed by the shot peening process. It can improve the adhesion of paint.

In addition, between the second step and the third step, that is, before performing welding after selecting the unit block body 150, a cleaning step of cleaning the area of the unit block body 150 to be welded may be included.

To ensure a strong, defect-free weld, it is important to clean the parts before welding, as contaminants such as oil, grease, dust, and rust can cause porosity, inclusions, and other weld defects.

To explain the specific cleaning steps, the area to be welded is visually inspected and then a degreasing process is performed.

The degreasing process may include a solvent cleaning process where oil, grease and other organic contaminants are wiped away using a cloth or brush soaked in a degreasing solvent such as acetone or a commercial degreaser, or, if oil or grease contamination is severe, an alkaline cleaning solution (e.g. For example, surfactants such as soap solutions) can also be used to effectively decompose organic pollutants.

This may then be followed by a mechanical cleaning step, for example a process such as abrasive blasting.

Abrasive blasting can use sand blasting or grit blasting to clean or remove hard contaminants from the area where the weld will be made. This provides an effective way to clean and roughen the surface of the area where the weld will be made, ensuring good weld penetration.

This may additionally involve wire brushing, which is a process of removing rust, scale, or paint using an electric wire brush.

In this wire brushing process, for example, if the unit block body 150 is made of stainless steel, a stainless steel brush is used to prevent contamination.

Thereafter, an acid washing step, that is, a pickling step, may be included to remove rust or mill scale remaining in the area to be welded using an acidic solution.

Furthermore, if there are tightly adhered contaminants in the area to be welded, it is advisable to apply an ultrasonic cleaning step.

The ultrasonic cleaning step uses ultrasonic waves in a cleaning solvent or water to efficiently remove contaminants firmly attached to the area to be welded.

Finally, it is possible to provide crack prevention by preheating the area where the weld will be performed, burning off some contaminants and removing unnecessary residual moisture.

Through this cleaning step, it is possible to prevent problems such as cracks occurring at welded areas or adjacent unit block bodies 150 not being firmly joined by welding.

Additionally, between the fourth and fifth steps, that is, after manufacturing the girder 100 by welding the upper plate 110, lower plate 120, and side plate 130, polyphenylene vinylene (PPV: polyphenylene vinylene) is used. It is preferable to include a process of coating the welded area with a surface protective layer.

Polyphenylenevinylene has the chemical formula of (C6H4-CH=CH)n, and not only provides mechanical strength and UV protection, but in the present invention, it provides properties that especially strengthen the corrosion resistance of welded areas.

In other words, welding is essential for joining metals, but the welded area, that is, the welded area, may be vulnerable to corrosion. Specifically, the joint may become weak at the welded area, which may damage the overall structural integrity of the girder as well as aesthetic damage. And in this case, there is even a risk of cracking or collapsing the girder.

Therefore, it is desirable to provide properties that enhance the corrosion resistance of the welded area by intensively coating the welded area with a surface protective layer containing polyphenylenevinylene (PPV).

Furthermore, the surface protective layer may contain additional ingredients through a specific process to enhance complex functions such as corrosion resistance as well as adhesion, which are specifically described as follows.

Figure 6 is a flowchart showing the steps for manufacturing the surface protective layer of the present invention.

Referring to FIG. 6, the surface protective layer of the present invention is manufactured through the step of preparing the primary mixture (S21), the step of preparing the secondary mixture (S22), and the step of completing the surface protective layer (S23). It can be.

(S21) Preparing the primary mixture

First, prepare a primary mixture by mixing 40 to 60 parts by weight of polyphenylene vinylene (PPV), 20 to 30 parts by weight of polyurethane, and 10 to 20 parts by weight of dimethylformamide (DMF). do.

As explained earlier, polyphenylenevinylene has good corrosion resistance, and as a result, the durability of the surface protective layer can be strengthened.

Polyurethane has high strength and excellent viscoelasticity, so it can effectively protect the surface of the surface protective layer while strengthening the viscoelasticity of the surface protective layer and showing excellent miscibility with polyphenylenevinylene.

Dimethylformamide is not only compatible with polyphenylenevinylene and polyurethane, but is also used as a suitable solvent for mixing the primary mixture to ensure coating application and homogeneity.

(S12) Preparing a secondary mixture

Next, 90 to 98 parts by weight of the primary mixture, 0.5 to 3 parts by weight of silica fume, and 1 to 5 parts by weight of polysorbate 20 are mixed to prepare a secondary mixture.

Silica fume is a material obtained by collecting ultrafine particles obtained as a by-product in the manufacturing process of various silicon alloys through dust collection. It is a material in an ultrafine state and is used as a nano-filler in the surface protection layer of the present invention.

This silica fume is a nano-filler with a small particle size and is a substance that can help secure viscoelasticity by facilitating the conversion of the polymer chain of phenylenevinellene into a three-dimensional form and securing space for the polymer chain to move.

Polysorbate 20 has the chemical formula C58H114O26 and is a type of surfactant that can help stabilize emulsions by uniformly dispersing substances that do not mix well.

According to this, the effect of ensuring uniform dispersion and distribution of the surface protective layer of the present invention can be expected.

(S23) Step of completing the surface protective layer

Finally, 90 to 99 parts by weight of the secondary mixture, 1 to 3 parts by weight of N-hydroxysuccinimide, and 1 to 5 parts by weight of polyethylene glycol methacrylate were mixed to form a surface protective layer. is completed.

N-Hydroxysuccinimide is a substance that assists the film strength improvement effect of phenylene benylene. It is cross-linked with phenylene benylene to improve the gel strength and surface strength enhancement function, ultimately improving the structural integrity of the welded area. to provide.

Polyethylene glycol methacrylate is a material belonging to the polycarboxylic type of fluidizing agent. It not only provides superior sensitivity compared to conventional lignin-based/naphthalene-based/melamine-based fluidizing agents, but also has the advantage of low slump loss. This provides the advantage of improving the surface fluidity of the surface protective layer, forming a more even film on the surface of the surface protective layer, and strengthening the adhesion of the surface protective layer to the welded area.

According to this surface protective layer, silica fume is added as a filler, and polyurethane boasts excellent miscibility with phenylenevinellene, providing sufficient viscoelasticity improvement, and at the same time, gel strength and surface strength can be assisted by additional composition. This can help strengthen viscoelasticity and adhesion as well as improve mechanical properties.

In order to explain the physical properties according to the composition of the surface protective layer, the evaluation results of Examples and Comparative Examples will be compared and explained.

<Example 1>

The surface protective layer was completed with 100 g of polyphenylene vinylene.

The surface protective layer was coated on a welded area made of steel metal, and the weight of the sample was 50 g, the surface area was 10 cm², and the metal density was 7.85 g/cm³.

<Example 2>

The primary material was prepared by mixing 50 g of polyphenylene vinylene, 20 g of polyurethane, and 20 g of dimethylformamide.

A secondary material was prepared by mixing 90 g of the prepared primary material, 2 g of silica fume, and 3 g of polysorbate.

A surface protective layer was completed by mixing 95 g of the prepared secondary material, 2 g of N-hydroxysuccinimide, and 3 g of polyethylene glycol methacrylate.

The surface protective layer was coated on a welded area made of steel metal, and the weight of the sample was 50 g, the surface area was 10 cm², and the metal density was 7.85 g/cm³.

<Comparative Example 1>

55g of epoxy resin, 30g of hardener, 10g of calcium carbonate, and 5g of UV stabilizer were mixed to complete 100g of surface protection layer, which is an epoxy coating material.

The surface protective layer was coated on a welded area made of steel metal, and the weight of the sample was 50 g, the surface area was 10 cm², and the metal density was 7.85 g/cm³.

<Comparative Example 2>

60g of polyurethane resin, 25g of hardener, 10g of acetone, and 5g of UV stabilizer were mixed to complete 100g of the surface protection layer, which is an epoxy coating material.

The surface protective layer was coated on a welded area made of steel metal, and the weight of the sample was 50 g, the surface area was 10 cm², and the metal density was 7.85 g/cm³.

<Experiment 1: Salt Spray Test>

A sufficient amount of saline water was sprayed on the four samples.

To derive the corrosion rate from the salt spray test, the measured material loss due to corrosion of the samples after 720 hours was applied.

The weight loss (ΔW) of each sample after 720 hours was as follows.

Example 1: 0.4g

Example 2: 0.35g

Comparative Example 1: 1.0g

Comparative Example 2: 0.9g

The corrosion rate was calculated using the following formula.

Formula: Corrosion rate (CR) = A×T×DΔW

Here, A is the surface area of the sample (cm²), T is the time (hour), D is the density of the sample (g/cm³), and ΔW is the weight loss (g).

Table 1 is a table showing experimental results on corrosion rate by salt spray test. Corrosion rate (CR: g/cm²/hour) Example 1 Example 2 Comparative Example 1 Comparative Example 2

In Table 1, the lower the corrosion rate, the higher the corrosion resistance, so it can be seen that the corrosion resistance is higher in the order of Example 2, Example 1, Comparative Example 2, and Comparative Example 1.

<Experiment 2: Adhesion test>

After taping 10 times with a taping tester, a relative evaluation was performed based on the change in surface resistance. The taping tester was a product from Nitto.

Table 2 is a table showing the experimental results of the adhesion test. adhesion Example 1 Good Example 2 very good Comparative Example 1 error Comparative Example 2 commonly

As shown in Table 2 above, it can be confirmed that Examples 1 and 2 of the present invention exhibit good adhesion even after repeated use when compared to Comparative Examples 1 and 2, showing excellent long-term use stability.

In addition, it can be seen that Example 2 has the best adhesion.

As explained so far, the configuration and operation of the installation method of the hoist crane for logistics transfer facilities according to the present invention have been expressed in the above description and drawings, but this is only an example and the spirit of the present invention is not limited to the above description and drawings. Of course, various changes and modifications are possible without departing from the technical spirit of the present invention.

10: support frame 20: saddle
100: Girder 110: Top plate
120: lower plate 130: side plate
150: Unit block font

Claims (6)

As a method of installing a hoist crane for a logistics transfer facility,
A first step of standing and installing a pair of left and right support frames in a logistics transfer facility;
A second step of preparing a plurality of unit blocks having various lengths and then selecting a specific number of unit blocks matching the length between the support frames;
A third step of manufacturing the upper plate, lower plate, and side plate by butt welding the selected unit blocks;
A fourth step of manufacturing a girder by welding the upper plate, lower plate, and side plates;
A fifth step of manufacturing a hoist crane by installing the girder on the support frame and then installing a hoist on the girder,
Between the fourth and fifth steps,
Including a process of coating a surface protective layer on a welded area where the upper plate, lower plate, and side plate are welded,
The surface protective layer is,
Preparing a primary mixture by mixing 40 to 60 parts by weight of polyphenylene vinylene (PPV), 20 to 30 parts by weight of polyurethane, and 10 to 20 parts by weight of dimethylformamide (DMF). and,
Preparing a secondary mixture by mixing 90 to 98 parts by weight of the primary mixture, 0.5 to 3 parts by weight of silica fume, and 1 to 5 parts by weight of polysorbate 20;
Complete the surface protective layer by mixing 90 to 99 parts by weight of the secondary mixture, 1 to 3 parts by weight of N-hydroxysuccinimide, and 1 to 5 parts by weight of polyethylene glycol methacrylate. A method of installing a hoist crane, characterized in that it is manufactured through the following steps. According to clause 1,
The fourth step is,
A method of installing a hoist crane, characterized in that it includes a process of short peening a specific area of the upper plate, lower plate, and side plate, including a welded area where the upper plate, lower plate, and side plate are welded. According to clause 1,
Between the second and third steps,
A method of installing a hoist crane, comprising: a cleaning step of cleaning the area to be welded in the unit block body. According to clause 3,
The cleaning step is,
A method of installing a hoist crane, comprising any one of wire brushing and ultrasonic cleaning. delete delete