KR102144947B1 - Screw case for loading and unloading of coal with high abrasion-resistant - Google Patents

Abstract

The present invention relates to a screw case for a coal unloader with excellent wear resistance and, more specifically, to a screw case for a coal unloader with excellent wear resistance, which comprises a case main body and a high hardness coating layer formed on an inner surface of the case main body. The screw case for a coal unloader with excellent wear resistance allows the high hardness coating layer to be formed on the inner surface, thereby maintaining excellent durability for a long period of time against friction with screws or coal.

Description

Screw case for coal unloading machine with excellent wear resistance {SCREW CASE FOR LOADING AND UNLOADING OF COAL WITH HIGH ABRASION-RESISTANT}

The disclosed content relates to a screw case for a coal unloading machine with excellent abrasion resistance, and more particularly, a screw for a coal unloading machine with excellent abrasion resistance that can maintain excellent durability for a long period of time against friction with screws or coal by forming a high-hardness coating layer on the inner surface. It's about the case.

Conventionally, forkrain buckets that open on both sides of a crane were used by hanging with cables when unloading coal. However, the above method has a problem of impacting a warehouse under the ship, a problem in which coal powder falls into the sea or scatters to a nearby residential area, as well as a problem of inferior work efficiency.

In order to improve the above problems, an open-bottomed rectangular bucket with a built-in pivot bucket device was installed on the crane's boom and a facility to pump coal through the lower portion of the bucket was installed to prevent coal powder from being blown by the wind. Was developed. However, this method also has an enlarged square barrel structure and is difficult to operate in an inclined manner, so access to the corners of the warehouse is difficult, so some corners of the ship's coal storage still remain, and the ship overturns due to the phenomenon that the remaining amount collapses at once. There was a risk of becoming.

In order to solve these problems, coal is recently transferred into a case connected in a vertical and horizontal structure, but the vertical case and the horizontal case act as a "b"-shaped robotic arm, so that every corner of the warehouse of a ship anchored in the sea near the pier. A screw for a coal unloading machine has been developed and used so that the screw rotates vertically and horizontally and is operated so that the screw rotating in the case transfers the coal.

The screw for the coal unloading machine above transfers coal while the screw rotates in the screw case. Since the screw case frame screw or coal continuously collides and causes friction, cracks occur on the surface of the screw case when used for a long time, causing coal to There was a problem that leaked out of the screw case.

Korean Patent Registration No. 10-0959671 (2010.05.17).

Disclosed is to provide a screw case for a coal unloading machine having excellent wear resistance that can maintain excellent durability for a long period of time against friction with screws or coal by forming a high hardness coating layer on the inner surface.

As an embodiment, the contents of this disclosure describe a screw case for a coal unloading machine having excellent wear resistance, characterized in that it comprises a case body and a high hardness coating layer formed on the inner surface of the case body.

Preferably, the case body may be made of tungsten.

More preferably, the high-hardness coating layer may be formed to a thickness of 0.05 to 1 millimeter.

More preferably, the high-hardness coating layer is made of a molten and vitrified frit, a silica powder mixture of 5 to 20 micrometers, an inorganic filler, an alumina compound, a nonionic surfactant, and a dispersant, and the vitrified frit is aluminum oxide, Sodium oxide, magnesium oxide, potassium oxide, lithium oxide, zinc oxide and silicon dioxide.

Even more preferably, the high-hardness coating layer is melted and vitrified frit 100 parts by weight, silica powder mixture 10 to 70 parts by weight, inorganic filler 20 to 140 parts by weight, alumina compound 10 to 30 parts by weight, nonionic surfactant 0.2 To 6 parts by weight and 0.2 to 12 parts by weight of the dispersant.

Even more preferably, the inorganic filler is titanium carbide, silica carbide, sodium silicate, potassium silicate, sodium and potassium colloidal silica, aluminum hydroxide, barium sulfate, clay, calcium carbonate, titanium oxide, kaolin, bentorite, It may be made of at least one selected from the group consisting of zeolite, alumina, silica, titania, zirconia, and lithium oxide.

Even more preferably, the alumina compound may be at least one selected from the group consisting of aluminum oxide, sodium oxide, iron oxide, potassium oxide, zirconia, titania, silica, aluminum phosphate, and lithium oxide.

Even more preferably, the nonionic surfactant may be made of one selected from the group consisting of amine oxides, alkyl esters, and polysorbates.

Even more preferably, the dispersant may be made of at least one selected from the group consisting of sodium alkylnaphthalenesulfonate, sodium alkylbenzenesulfonate, alkyl allyl ether, diethanolamine, and polyacrylate ammonium salt.

The screw case for a coal unloading machine with excellent wear resistance as described above has a high hardness coating layer formed on the inner surface, and thus exhibits an excellent effect of maintaining excellent durability for a long period of time against friction with screws or coal.

1 is a block diagram showing a coal unloader to which a screw case for a coal unloader with excellent wear resistance disclosed is applied.

Hereinafter, a preferred embodiment of the present invention and the physical properties of each component will be described in detail, but this is for explaining in detail enough that one of ordinary skill in the art can easily carry out the invention, This does not mean that the technical spirit and scope of the present invention are limited.

The disclosed screw case for a coal unloading machine having excellent wear resistance includes a case body 10 and a high hardness coating layer 20 formed on the inner surface of the case body.

The case body 10 represents the shape of a pipe wrapped around the outer surface of the screw 30 for a coal unloading machine disclosed, and the screw 30 inside the case body 10 is operated so that coal can be transferred into the case. , In consideration of the shape stability and abrasion resistance of the disclosed screw case for a coal unloading machine, it is preferably made of a metal component, and more preferably made of tungsten having excellent corrosion resistance and abrasion resistance.

The high-hardness coating layer 20 is formed in a thickness of 0.05 to 1 mm on the inner surface of the case body 10, and is composed of components having excellent abrasion resistance to improve the abrasion resistance of the screw case for a coal unloading machine having excellent wear resistance. Do it.

If the thickness of the high-hardness coating layer 20 is less than 0.05 mm, the above effect is insignificant, and when the thickness of the high-hardness coating layer 20 exceeds 1 mm, the above effect is not greatly improved and cracks easily occur. I can.

In addition, the high-hardness coating layer 20 is made of a frit that is molten and vitrified, a mixture of 5 to 20 micrometers of silica powder, an inorganic filler, a phosphor oxide, a nonionic surfactant, and a dispersant, and is melted and vitrified 100 parts by weight. , 10 to 70 parts by weight of a silica powder mixture, 20 to 140 parts by weight of an inorganic filler, 10 to 80 parts by weight of a phosphate, 0.2 to 6 parts by weight of a nonionic surfactant, and 0.2 to 12 parts by weight of a dispersant.

The molten and vitrified frit contains aluminum oxide, sodium oxide, magnesium oxide, potassium oxide, lithium oxide, zinc oxide, and silicon dioxide as main components constituting the high-hardness coating layer 20, and pulverized frit is used. Compared to the case, it is possible to provide a coating layer having improved adhesion and hardness with the case body.

The silica powder mixture of 5 to 20 micrometers may include fine silica particles or amorphous silica, silica slip, colloidal silica, silicon carbide, etc., and the silica powder mixture composed of the above components is applied to the surface of the case body 10. It serves to accelerate the hardening of the formed high-hardness coating layer.

In addition, the silica powder mixture is completely dispersed in the silicate or modified silicate frit at room temperature to neutralize the high-hardness coating layer 20, and the silica particles are heated in the process of forming the high-hardness coating layer 20 through a drying process. And as it is dehydrated and floats to the surface of the high-hardness coating layer and is fixed, the alkali metal component is fixed in the tetrahedral three-dimensional structure of silica to prevent elution to the surface of the high-hardness coating layer 20.

Accordingly, whitening by alkali elution does not appear on the surface of the high-hardness coating layer 20, and a coating layer having excellent water resistance can be formed.

At this time, the amorphous silica is a mixture of SiO ₂ and Al ₂ O ₃ in a 1:1 part by weight, heated, melted, calcined, quenched with cold water, and pulverized with a ball mill to have a particle size of 5 to 20 microns or ethyl silicate (SiCOC ₂ H ₅ ) ₄ can be hydrolyzed and then dried at 100° C. for 1 hour.

If the particle size of the silica powder mixture is less than 5 micrometers or the content is less than 10 parts by weight, the effect is insignificant, and if the particle size of the silica powder mixture exceeds 20 micrometers or the content exceeds 70 parts by weight, the above It is not desirable because the effect is not greatly improved and the mechanical properties of the high-hardness coating layer 20 can be reduced.

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The alumina compound contains 10 to 30 parts by weight, and at least one selected from the group consisting of aluminum oxide, sodium oxide, iron oxide, potassium oxide, zirconia, titania, silica, aluminum phosphate, and lithium oxide is preferably mixed, the case It improves the adhesion of the high-hardness coating layer 20 to the body 10, and serves to improve water resistance and hardness.

If the content of the alumina compound is less than 10 parts by weight, the mechanical properties of the high-hardness coating layer 20 deteriorate, and the high-hardness coating layer 20 cannot be formed thickly on the case body 10, and the content of the alumina compound is When it exceeds 30 parts by weight, the impact strength or hardness of the high-hardness coating layer 20 is excessively improved, and cracking may occur.

The nonionic surfactant contains 0.2 to 6 parts by weight, and consists of one selected from the group consisting of amine oxides, alkyl esters and polysorbates. If the nonionic surfactant consisting of the above components is contained, a high hardness coating layer The components used to form (20) are evenly mixed to form a coating layer exhibiting homogeneous physical properties.

If the content of the surfactant is less than 0.2 parts by weight, it is difficult to achieve an effective emulsified state on the surface of the inorganic particles, and if the content of the surfactant exceeds 6 parts by weight, it is difficult to control the size of the fine particles, recover the residual emulsifier and increase the cost. There is this.

The dispersant contains 0.2 to 12 parts by weight, and consists of at least one selected from the group consisting of sodium alkylnaphthalenesulfonate, sodium alkylbenzenesulfonate, alkyl allyl ether, diethanolamine, and polyacrylate ammonium salt, and a high hardness coating layer (20) It improves the dispersibility of the components constituting the to form a coating layer exhibiting homogeneous physical properties, and serves to suppress excessive increase in viscosity.

When the content of the dispersant is less than 0.2 parts by weight, the effect of improving the dispersibility of the effect of controlling the viscosity of the components used to form the high-hardness coating layer 20 is insignificant, and when the content of the dispersant exceeds 12 parts by weight, the high-hardness coating layer Since the viscosity of the component used to form (20) is too low, the fluidity is improved more than necessary, which is not preferable.

Hereinafter, a method of manufacturing a screw case for a coal unloader having excellent wear resistance and physical properties of a screw case manufactured through the manufacturing method will be described with reference to examples.

<Production Example 1> Preparation of a frit made to be melted and vitrified

Silicon dioxide 35g, aluminum oxide 40g, lithium oxide 5g, zinc oxide 15g, magnesium oxide 2g, calcium oxide are mixed, heated to 1000℃ in a high-temperature furnace, calcined and pulverized with a ball mill for 24 hours to form a fine particle liquid Was prepared, and a mixture of 35 g of a 50% aqueous solution of potassium oxide and 65 g of an aqueous 40% sodium oxide solution in the particulate liquid was stirred for 4 hours and melted to prepare a vitrified frit.

<Production Example 2> Preparation of silica powder mixture

50 g of silicon dioxide and 50 g of aluminum oxide were mixed, heated to 1000° C., calcined, and pulverized with a ball mill for 8 hours to prepare a silica powder mixture having a particle size of 5 to 20 micrometers.

<Production Example 3> Preparation of inorganic filler

75 g of sodium silicate, 20 g of potassium silicate, 2 g of titanium oxide, and 3 g of zirconia were mixed and then stirred with a ball mill for 8 hours to prepare an inorganic filler.

<Production Example 4> Preparation of alumina compound

22 g of aluminum oxide, 45 g of sodium oxide, 5 g of iron oxide, 2.5 g of zirconia, 1.5 g of lithium oxide, 4 g of titania, 17 g of silica, 3 g of aluminum phosphate, and 100 g of distilled water were mixed and pulverized for 2-4 hours with a ball mill to prepare an alumina compound. .

<Example 1>

100 parts by weight of the vitrified frit prepared through Preparation Example 1, 40 parts by weight of the silica powder mixture prepared through Preparation Example 2, 20 parts by weight of the alumina compound prepared through Preparation Example 3, nonionic surfactant (poly After spray-coating a coating agent made by mixing 3 parts by weight of oxyethylene sorbitan monostearate) and 6 parts by weight of a dispersant (sodium alkylnaphthalene sulfonate) on the inner surface of the case body made of tungsten to a thickness of 0.5 millimeters, It was dried at a temperature for 20 minutes to prepare a screw case for a coal unloading machine with excellent wear resistance.

<Example 2>

Proceeding in the same manner as in Example 1, but spray-coating the coating agent to a thickness of 0.1 mm on the inner surface of the case body to prepare a screw case for a coal unloader having excellent wear resistance.

<Example 3>

Proceeding in the same manner as in Example 1, but spray-coating the coating agent to a thickness of 1 millimeter on the inner surface of the case body to prepare a screw case for a coal unloader having excellent wear resistance.

The hardness, abrasion resistance, alkali resistance, acid resistance, salt water resistance, impact resistance and heat resistance of the screw case manufactured through Examples 1 to 3 were measured and shown in Table 1 below.

{However, for the hardness, a 9H pencil was placed on the inner surface of the screw case at an angle of 45 degrees to confirm that scratches occurred when the coating film was pushed.

In addition, for abrasion resistance, a 3M scrubber was soaked with water, placed on the inner surface of the screw case, placed on the inner surface of the screw case, placed on the inner surface of the screw case, and reciprocated at least 30cm to the left and right 10 times, and then used a method of checking whether scratches occurred on the surface.

In addition, for acid resistance, a method of confirming whether discoloration occurs in the exterior of the coating film after 2 hours by dropping an aqueous hydrochloric acid solution having a mass concentration of 5% on the inner surface of the screw case.

In addition, salt water resistance was used to check the presence or absence of abnormalities after 720 hours of salt spray test on the inner surface of the screw case.

In addition, for impact resistance, a 500g circular weight was dropped on the inner surface of the screw case from a height of 1m to check the surface condition.

In addition, heat resistance was heated at 300°C for 1 hour and air-cooled, and then the inner surface of the screw case was visually observed to check for abnormalities.

○: Good, △: Normal, ×: Poor}

<Table 1>

As shown in Table 1 above, it can be seen that the screw cases for coal loading machines manufactured through the disclosed Examples 1 to 3 are excellent in hardness, abrasion resistance, alkali resistance, acid resistance, salt water resistance, impact resistance and heat resistance.

Accordingly, the disclosed screw case for a coal unloading machine having excellent wear resistance has a high hardness coating layer formed on the inner surface, so that it can maintain excellent durability for a long period of time against friction with the screw or coal.

10; Case body
20; High hardness coating layer
30; screw

Claims (9)

Case body; And
Consisting of; a high-hardness coating layer formed on the inner surface of the case body,
The case body is made of tungsten,
The high hardness coating layer is formed to a thickness of 0.05 to 1 millimeter,
The high hardness coating layer includes 100 parts by weight of vitrified frit, 40 parts by weight of a silica powder mixture of 5 to 20 micrometers, 20 parts by weight of an alumina compound, 3 parts by weight of polyoxyethylene sorbitan monostearate, and 6 parts by weight of sodium alkyl naphthalene sulfonate. It is formed by spray-coating the coating agent formed by mixing and drying it at a temperature of 280°C for 20 minutes,
The vitrified frit includes aluminum oxide, sodium oxide, magnesium oxide, potassium oxide, lithium oxide, zinc oxide, and silicon dioxide.
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