KR20090041775A - Screw for loading and unloading of coal - Google Patents

Abstract

A screw for loading and unloading coal is provided to prevent abrasion of a screw blade due to the contact between the screw blade and coal and lengthen lifetime of the screw by forming a high hardness member at the site in which the abrasion of the screw blade is generated. A screw for loading and unloading coal comprises: a screw blade(10) spirally coupled in the outer circumference of a main shaft(120) rotated in the inside of the screw case; and a high hardness member(20) which is coupled in the leading end of the screw blade and prevents the abrasion of the screw blade. The high hardness member is made of the material sintered by mixing binder metal for sintering with carbides, nitrides, borides and ceramics.

Description

Screw for loading and unloading of coal}

The present invention relates to a conveying screw, and more particularly, to a coal unloader screw having a high hardness member attached to transfer the coal, but to prevent wear of the screw wing due to the contact of the screw blade and the coal.

Conventionally, fork crane buckets that open on both sides of a crane during coal unloading were used as medals. However, the above method has not only a problem of impacting the lower warehouse of the ship and a problem of coal dust falling to the sea or flying to a nearby residential area, but also a problem of low work efficiency.

In order to improve this, an unloading machine was developed, which suspended a rectangular open cylinder bucket with a built-in pivot bucket on the boom of a crane, and installed a facility to pump coal through the lower part of the crane. However, this method also has a large rectangular barrel structure and is difficult to operate inclined mode, so it is difficult to access the corner of the warehouse, so that the remaining amount remains at some corners of the ship's coal warehouse, and the vessel is overturned due to the collapse of the remaining moment. There was a risk of becoming.

In order to solve these problems, as shown in FIG. 1, coal 4 is transferred into barrels 2 and 3 connected in a vertical and horizontal structure, but the vertical barrel 2 and the horizontal barrel ( 3) the "a" shaped robot arm to rotate the upper and lower, left and right corners of the warehouse 7 of the vessel (7) anchored in the sea (6) near the pier (5), rotating in the barrel (2) (3) A screw for a coal unloader has been developed in which the screw 8 is operated to transport coal.

However, the conventional coal unloading machine screw transfers coal while generating friction with coal continuously while passing through several stages of screws assembled in a barrel formed about 40m vertically and 40m horizontally. There was a problem in that extreme wear occurs.

In particular, the wear of the screw blades becomes more severe toward the circumferential edges of the screw blades, and the tip end portions of the screw blades on the side where coal is first introduced, that is, the wear edges are extremely severe enough to lose shape in a short period of time. there was. In order to improve this, the steel blades are made of strong steel blades and hard welded on the edges of the screw blades. However, the sharp edges of the cutting edges still wear out, and the front edges wear 5mm to 10mm per year. The thickness of the 15mm screw wing itself is undermining its strength.

Accordingly, there is a big problem that the operation efficiency of transporting coal is lowered and the unloading efficiency is lowered, and the maintenance cost and the overall cost are increased because the screw blade must be replaced frequently.

The present invention was created in order to solve the above-mentioned problems, the wear of the screw blade is significantly reduced even when used for a long time during coal unloading to increase the work efficiency and significantly reduce the maintenance cost, installation is relatively simple The purpose is to provide a screw for the coal unloader that can provide a stable transport operation environment at a low cost.

In order to achieve the above object, the present invention is formed on a main shaft that is rotated in the screw case to transfer the coal, screw blades spirally coupled to the outer peripheral surface of the main shaft; And a high hardness member formed at the tip of the screw blade to prevent abrasion of the screw blade and formed by sintering the high hardness powder.

In addition, according to the present invention, the high hardness member is a carbide (Carbides) of at least one selected from WC, Cr ₃ C ₂ , TiC, B ₄ C, SiC, VC, NbC, TaC, MoC, and ZrC or a mixture thereof , At least one selected from nitrides TiN, SiN, and CN, or a mixture thereof, at least one selected from borides ZrB ₂ , TiB ₂ , BN, B ₄ C, AlMgB ₁₄ , WB, and HfB ₂ Or a mixture thereof, at least one selected from the group consisting of ceramics AL ₂ O ₃ , and ZrO ₃ , or a mixture of mixtures thereof, or a mixture of groups mixed therewith, followed by remixing with a bonding metal for sintering to sinter It provides a screw for the coal unloader, characterized in that made of a made material.

In addition, according to the present invention is formed on the main shaft that is rotated in the screw case for conveying coal, the screw blades spirally coupled to the outer peripheral surface of the main shaft; And a high hardness member made of SKD11 material which is coupled to the tip of the screw blade to prevent wear of the screw blade and is chemically heat treated (TD) by a metal element. .

In addition, according to the present invention, the high-hardness member is selected from the group of rectangular, "c" shaped, "a" shaped cross section, and is divided into multiple pieces or attached as a single body to the tip of the screw blade. Provide screw for coal unloader.

In addition, according to the present invention, the screw blade is recessed inwardly from the tip of the screw blade, at least some sections have a groove formed so that the width thereof becomes smaller toward the tip side, the high hardness member has a shape corresponding to the groove As it is fastened to the groove provides a screw for the coal unloader, characterized in that the departure from the screw wing.

In addition, according to the present invention further comprises an excavator disposed to surround the outer shell of the screw case, the excavator guides the coal to enter the screw blade side, the high hardness member is attached to the leading edge It provides a coal unloading machine screw having at least one blade portion.

In addition, according to the present invention, the screw blade is provided with a main body portion and a wing piece, the high hardness member is coupled to the wing piece to provide a coal unloading machine screw, characterized in that the main body and the wing piece is welded to each other. do.

In addition, according to the present invention, the hard member is selected from the group of brazing method, screwing method, mixing method of brazing and screw fastening to the screw blade or blade pieces, coal screw for coal unloading, characterized in that attached to To provide.

The screw for the coal unloader according to the present invention attaches a hard member to the site where the wear of the screw blades occurs so as to prevent wear of the screw blades due to the contact of the screw blades and coal, the wear of the screw blades remarkably even after long-term use. This has the advantage of extending the life of the screw.

On the other hand, the screw for coal unloading machine according to the present invention can be effectively applied to coal transfer, increase the transfer efficiency, can significantly reduce the maintenance cost.

That is, the screw for the coal unloader according to the present invention should be frequently fostered and repaired due to the wear of the screw blades, and solves the problems caused by having a large number of spare parts for the operation of the repair period. It is a very useful invention that can meet the needs of customers by providing the environment, minimize the occupied space and reduce the cost of securing spare parts.

The screw for the coal unloader according to the present invention includes a screw blade fixed to the outer circumferential surface of the main shaft that is rotated in the screw case to transfer coal. The screw vanes are rotated together integrally with the main shaft to vertically transfer coal loaded in a ship or other warehouse from bottom to top or horizontally from one side to the other.

In this way, the screw blade in direct contact with coal is coupled to a high-hardness member made by sintering high-hardness powder at the tip portion, thereby preventing wear due to collision with coal.

Hereinafter, the technical configuration of the present invention according to the accompanying drawings in detail.

2 is a perspective view of a screw for a coal unloader according to the present invention, Figures 3a, 3b, 3c, 3d, 3e is an explanatory view showing another shape of the high hardness member according to another embodiment of the present invention, Figure 4a, 4b, and 4c are explanatory views showing a method of coupling the high hardness member and the screw blade according to another embodiment of the present invention, Figure 5 is a high hardness member and screw blade according to another embodiment of the present invention An exploded perspective view showing the coupling, Figure 6 is a perspective view showing an indenter according to the present invention.

As shown in FIGS. 2 to 6, the coal unloading machine screw 100 according to the present invention is formed on the main shaft 120 that is rotated inside the screw case 110 to transfer coal. A high hardness member formed on the tip of the screw blade 10 and the screw blade 10 spirally coupled to the outer circumferential surface of the 120 to prevent abrasion of the screw blade 10, and made by sintering the high hardness powder ( 20) is made.

Screw case 110 is preferably an outer frame made of a cylindrical shape, so that coal is transported therein. Screw case 110 is appropriately designed according to the working environment in which the transfer is made.

For example, when unloading the powder such as coal loaded in the warehouse of the vessel anchored near the pier, the screw case 110 is connected to rotate horizontally and longitudinally, and the screw case 110 in the horizontal direction is rotated up and down again Can be installed. The screw case 110 driven as described above allows the unloading to be carried out while moving the coal loaded in the warehouse to every corner of the floor.

The main shaft 120 is rotated by a motor in the screw case 110. The rotational torque of the main shaft 120 acts as a medium for transmitting a driving force for transporting coal.

Screw blade 10 is formed spirally along the outer peripheral surface of the main shaft (120). The screw blade 10 is welded to the main shaft 120 is rotated integrally with the main shaft 120.

In the case of the screw case 110 installed in the transverse and longitudinal directions described as an example, the main shaft 120 and the screw blades 10 are formed in the transverse and longitudinal directions in the screw case 110. The main shaft 120 and the screw blades 10 configured as described above rotate in the screw case 110 to forcibly transfer coal loaded in the ship warehouse from the lower part to the upper part in the longitudinal direction, and the coal transferred to the upper part. May be implemented to be transported in the transverse direction and discharged to a desired point through the conveyor belt.

The high hardness member 20 is formed at the tip end of the screw blade 10 to prevent wear of the screw blade 10. The high hardness member 20 is made by plastic processing the high hardness powder and has a considerably high hardness.

Preferably, the high hardness member 20 is to be attached to the point where the friction with the coal, that is, the tip of the wear occurs. Since the wear of the screw blade 10 is mainly started at the tip and the edge, such as the edge of the screw blade 10, since the wear is started once the wear progresses faster than the initial wear occurs, Attaching the high hardness member 20 to the site where the wear begins has the effect of delaying the progress of the wear at its source.

On the other hand, since the high hardness member 20 has a considerably higher hardness than other metals such as steel, it can be very effectively applied and used in a device for unloading a relatively high hardness material such as coal.

In this way, by attaching the high hardness member 20 to the leading edge of the screw blade 10, it significantly delays the wear caused by friction generated between the relatively high wear coal and the screw blade 10 rotated by a large rotational torque By doing so, the life of the screw blade 10 can be greatly extended.

The high hardness member 20 is an object having a very high hardness made by sintering the high hardness powder as described above. The sintered body is very hard and wear-resistant, so it is used for cutting blades, cutting cutters, dies, etc. of metal products, and also for the tip of rock drilling tools for drilling holes in rocks in mines and civil engineering. Such a sintered compact is mixed with high hardness particles such as tungsten carbide and cobalt or nickel powder, evenly mixed, pressurized at a high pressure, heated to about 1,000 ° C., pre-sintered, and finished in a final form, followed by 1,400 ° C. Heat the furnace to sinter it. By this process, cobalt or nickel powder melts and spreads between the high hardness particles, and serves as a binder between the high hardness particles to form a strong sintered body.

On the other hand, the high hardness member 20 is at least one selected from carbides (Carbides) WC, Cr ₃ C ₂ , TiC, B ₄ C, SiC, VC, NbC, TaC, MoC, and ZrC or a mixture thereof, nitride (Nitrides) at least one selected from TiN, SiN, and CN, or a mixture thereof, at least one selected from ZrB ₂ , TiB ₂ , BN, B ₄ C, AlMgB ₁₄ , WB, and HfB _{2 as} borides And a mixture of at least one selected from the group consisting of ceramics AL ₂ O ₃ and ZrO ₃ or a mixture thereof, or a mixture of groups mixed therewith, followed by sintering by remixing with a bonding metal for sintering. It may be made of.

Meanwhile, as shown in FIG. 3B, the coal unloader screw 100 according to the present invention has a high hardness member 20 'made of SKD11 material chemically heat treated (TD) by a metal element at the tip of the screw blade 10'. Can also be used.

The high hardness member 20 'is made of SKD11 subjected to TD treatment. The SKD11 refers to a surface hardened by chemically heat treatment (TD: Toyota diffusion treatment) by a metal element. The SKD11 carbide treatment, referred to as carbide Diffusion treatment or Toyota Diffusion treatment, is as follows. First of all, metal elements such as V, Cr, and Ti forming carbide are enclosed on the surface of SKD11 material, and then heat-diffusion is used to diffuse carbide into the SKD11 base material and combine with carbon in the SKD11 base material to bond to the hard surface on the surface. Refers to the formation of a carbide layer.

In addition, as shown in Figure 3a, the screw blade 10 has a main body portion 12 and the blade piece 11, the high hardness member 20 is coupled to the blade piece 11 The main body 12 and the blade pieces 11 may be welded to each other.

That is, the combination of the high hardness member 20 and the screw blade 10 may be attached to the high hardness member 20 after making a seat for the high hardness member 20 to the screw blade 10, separately wing It may be made by attaching the high hardness member 20 to one end of the wing piece 11 by providing a piece 11, and coupling the wing piece 11 to the screw wing 10 again. The hatched portion of FIG. 3A shows the junction W, which is the welded portion of the screw blade 10 and the blade pieces 11.

When the high hardness member 20 is coupled to the screw blade 10, since the high hardness member 20 is not melted, general welding cannot be performed, so a special bonding technique such as brazing is used. Joining small parts is advantageously done in a furnace, but for large objects that are not charged in the furnace, they are treated with external local heating using a welding torch. Therefore, when cutting a part of the end of the screw blade 10 and coupled with the high hardness member 20, it is attached by a special joint in the furnace, and then taken out of the furnace and rejoined by recirculation welding to the screw blade 10. In this case, when the bonding operation in the presbyopia, there is an advantage that the oxidation is prevented and the bonding is performed well. On the other hand, when directly attaching the high hardness member 20 in the prepared position of the large screw blade 10 can be easily bonded using an external local heating device such as a welding torch.

On the other hand, the high hardness member 20 is a cross-section is selected from the group of the square, "c" shape, "a" shape, it may be divided into a plurality of parts attached to the front end of the screw blade 10 or may be attached as a single body. .

That is, the high hardness member 20 may have a rectangular cross section as shown in FIG. 3A, a cross section may be formed as a "b" shape as shown in FIG. 3 b, and a cross section may be formed as a "c" shape as shown in FIG. 3 c. .

On the other hand, the high hardness member 20, one surface may be made in a variety of shapes, such as janggogyeong, as shown in Figure 3d, it can be used to change the shape and size according to the installation position of the screw blade (10). Here, Django type refers to a Django shape as shown in Figure 3d, such a shape is a high hardness member 20 is more easily coupled to the screw blade 10, the structure is not easily separated from the screw blade (10) to provide.

In addition, the high hardness member 20 may be coupled in the form of a single body to surround the front end and the edge of the screw blade 10 as shown in FIG.

As described above, the high hardness member 20 is preferably formed by varying its shape and size according to the attachment position of the screw blade 10, and is divided into pieces and attached to the screw blade 10 or attached as a single body. Can be.

In addition, the high hardness member 20 may be selected and attached to the screw blade 10 or the blade piece 11 selected from the group of brazing method, screw fastening method, mixing method of brazing and screw fastening.

That is, the high hardness member 20 may be coupled to the end of the screw blade 10 or the blade piece 11 in a brazing manner. Figure 4a shows that the weld 52 is formed between the screw blade 10 and the high hardness member 20. Here, brazing is a technique of joining two base materials by applying a filler material and heat to the base material at a melting point of the base metal to be joined at a temperature of 450 ° C. or higher, without being damaged. This brazing method is not deformed after the operation, it is excellent in strength and airtightness can be effectively applied to combine the screw blade 10 and the high hardness member 20 according to the present invention.

On the other hand, the high hardness member 20 may be fastened to the end of the screw blade 10 or the blade piece 11 using a screw 51 as shown in Figure 4b. This screw fastening method has the advantage that the high hardness member 20 can be attached or detached from the screw blade 10 or the blade piece 11 to facilitate maintenance.

In addition, the high hardness member 20 may be coupled to the end of the screw blade 10 or the blade piece 11 by mixing the brazing method and the screw fastening method. That is, as shown in FIG. 4c, the screw blade 10 and the high hardness member 20 are brazed to form a weld 52, and then tightened with a screw 51 to finish. Such a method has an advantage of increasing the fastening force of the high hardness member 20.

In the above fastening method by the screw 51, it is preferable to form a hole for screwing in advance in the high hardness member 20 and the screw blade 10 or the wing piece 11 of the base material. On the other hand, in order to prevent abrasion of the screw 51 head, it is good to keep the screw 51 head carbide welded.

Preferably, the screw blade 10 is recessed inward from the tip of the screw blade 10, as shown in Figure 5, at least a portion of the groove 14 is formed so that the width is smaller toward the tip side It is provided, the high hardness member 20 is fastened to the groove 14 in a shape corresponding to the groove 14 to prevent the departure from the screw blade (10).

That is, the groove 14 is formed such that the width becomes smaller toward the tip side of the screw blade 10, the screw blade 10 is formed with a locking portion 15 in the opening of the groove (14). The locking portion 15 serves to prevent the high hardness member 20 from being separated to the outside, thereby increasing the fastening force of the screw blade 10 and the high hardness member 20. As such, the groove 14 is formed at the tip of the screw blade 10, and the high hardness member 20 is inserted into the groove 14 to prevent the high hardness member 20 from falling out. After the fitting as described above it is good to finish the coupling of the screw blade 10 and the high hardness member 20 by brazing the screw blade 10 and the high hardness member 20 as described above. Therefore, the hard member 20 is stably fixed to the screw blade 10 even in the continuous collision of the screw blade 10 and coal during coal unloading.

On the other hand, the screw 100 for the coal unloader according to the present invention is fastened to the lower end of the screw case 110, so that the coal easily enters the screw wing 10, the high hardness member on the tip and the edge It is preferable that the at least one insertion blade portion 31 to which the 20 is attached further includes an injector 30 formed on an outer circumferential surface thereof.

Excavator 30 is formed in a cylindrical shape as shown in Figure 6, one end of the screw case 110, that is, the lower end of the screw case 110 to start coal entering the screw blade 10 It is located, and is rotated in the opposite direction to the main shaft 120 by a drive device separate from the main shaft (120). The excavator 30 moves every corner between the coals loaded in the warehouse, and injects coal powder into the space between the screw blades 10 while rotating in the opposite direction to the main shaft 120 while directly contacting the coal. Play a role.

Insertion blade 31 is formed on the outer circumferential surface of the injector 30, preferably at least one is formed along the outer circumferential surface of the injector 30 in the shape of a pinwheel fan (fan). At this time, when the blade blade portion 31 of the injector 30 rotates, the nearby powder is scraped and filled into the space between the screw wings 10 through the inside of the injector 30, and then rotates the screw blade. Take (10) to the top or elsewhere.

At this time, at least one inlet hole (not shown) may be formed on the outer circumferential surface of the injector 30 so that the coal guided by the insertion blade unit 31 can be smoothly introduced into the screw wing 10 side.

In addition, the blade portion 31 of the injector 30 is preferably the high hardness member 20 is coupled to the tip and the edge. Since the blade blade portion 31 is easily worn due to contact with coal as in the case of the screw blade 10, the high hardness member (3) is formed at the tip and the edge of the blade blade portion 31, which is a portion at which wear starts. 20) it is good to attach.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and any person skilled in the art to which the present invention pertains may have various modifications and equivalent other embodiments. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a schematic configuration diagram showing a conventional unloading device.

Figure 2 is a perspective view of the screw for the coal unloader according to the present invention.

Figure 3a, 3b, 3c, 3d, 3e is an explanatory view showing another shape of the high hardness member according to another embodiment of the present invention.

Figure 4a, 4b, 4c is an explanatory view showing a coupling method of a high hardness member and a screw blade according to another embodiment of the present invention.

Figure 5 is an exploded perspective view showing a combination of a hard member and a screw blade according to another embodiment of the present invention.

Figure 6 is a perspective view of the injector according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: screw wing 11: wing piece

12: main body 14: groove

15: engaging portion 20: high hardness member

30: Excavator 31: blade part

51 screw 52 weld

W: Joint 100: Screw for coal unloader

110: screw case 120: spindle

Claims (8)

It is formed on the main shaft rotated in the screw case to transfer the coal, A screw blade helically coupled to an outer circumferential surface of the main shaft; And A high hardness member coupled to the tip of the screw blade to prevent abrasion of the screw blade and made by sintering the high hardness powder; Screw for coal unloader, characterized in that it comprises a. The method according to claim 1, The high hardness member, At least one selected from carbides WC, Cr ₃ C ₂ , TiC, B ₄ C, SiC, VC, NbC, TaC, MoC, and ZrC, or mixtures thereof, At least one or a mixture thereof selected from nitrides such as TiN, SiN, and CN, At least one selected from borides ZrB ₂ , TiB ₂ , BN, B ₄ C, AlMgB ₁₄ , WB and HfB ₂ or mixtures thereof, At least one selected from ceramics AL ₂ O ₃ , and ZrO ₃ , or mixtures thereof A screw for a coal unloader, characterized in that the material is selected from the group of, or prepared by mixing the groups with each other and then mixed with the sintered metal for sintering and sintered. It is formed on the main shaft rotated in the screw case to transfer the coal, A screw blade helically coupled to an outer circumferential surface of the main shaft; And A high hardness member of SKD11 material coupled to the tip of the screw blade to prevent wear of the screw blade and chemically heat treated (TD) by a metal element; Screw for coal unloader, characterized in that it comprises a. The method according to any one of claims 1 to 3, The high hardness member, Cross section is selected from the group of the square, "c" shape, "a" shape, the screw for coal unloader, characterized in that divided into a plurality of pieces attached to the tip of the screw blade or attached as a single body. The method according to any one of claims 1 to 3, The screw blade, It is recessed inwardly from the tip of the screw blade, at least some sections have grooves formed so that the width thereof becomes smaller toward the tip side, The hard member is fastened to the groove in a shape corresponding to the groove, the screw for coal unloader, characterized in that the departure from the screw wing to be prevented. The method according to any one of claims 1 to 3, It is further provided with an injector disposed to surround the outer shell of the screw case, The injector is, And at least one insert blade portion to guide the coal to the screw blade side, the hard member being attached to the leading edge thereof. The method according to any one of claims 1 to 3, The screw blade, Coal unloader screw having a main body and a wing piece, the high hardness member is coupled to the wing piece to weld the main body and the wing piece to each other. The method according to claim 7, The high hardness member, A screw for a coal unloader, characterized in that selected from the group of brazing method, screw fastening method, a mixing method of brazing and screw fastening to the screw blade or wing piece.

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