JP2009057131A - Liner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liner capable of preventing a ceramic member from being cracked, chipped, or fallen off even when it is used for preventing abrasion, and reducing its weight. <P>SOLUTION: The liner comprises a urea resin layer 1, a fitting bolt 3 with its head portion being embedded in the urea resin layer 1 and its fore end being projected from a back side of the urea resin layer 1, and a plurality of ceramic members 2 which are embedded in a surface portion of the urea resin layer 1 while a part thereof is exposed on the surface of the urea resin layer 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wear-resistant liner provided on a hopper inner wall portion or the like to which an iron ore or the like hits when moving iron ore or a coke lump using a belt conveyor and a hopper.

  When moving iron ore, coke mass, etc. using a belt conveyor and hopper, the iron ore dropped from the tip of the belt conveyor hits the inner surface of the hopper or the upper surface of the chute provided in the hopper, and the inner surface of the hopper or chute May damage the top surface of the surface and make holes. Therefore, a liner is usually provided to prevent the inner surface of the hopper or the upper surface of the chute from being perforated.

In general, as shown in FIGS. 6A and 6B, the liner includes a metal substrate 14 with mounting bolts 13 protruding on the back surface, and an elastic layer made of rubber or urethane formed on the surface of the metal substrate 14. 11 and a wear-preventing metal member or ceramic member 12 laid on the surface of the elastic layer 11 (see Patent Document 1). And the said metal member or the ceramic member 12 is a part which contacts iron ore etc.
JP-A-8-268521

  However, when a metal member is used for wear prevention, the liner is very heavy because the metal substrate 14 is also provided below the metal member. For this reason, the burden of replacing the liner is large, and the danger is high. Therefore, when the ceramic member 12 is used for wear prevention, the liner becomes light, but there is a drawback that the ceramic member 12 is cracked, chipped, or dropped off due to contact with iron ore or the like. Moreover, if one place is dropped, it will drop off in a chain. Although the ceramic member 12 itself has wear resistance, the lifetime of the liner is shortened due to the above-mentioned drawbacks.

  The present invention has been made in view of such circumstances, and even when a ceramic member is used for wear prevention, the ceramic member can be prevented from cracking, chipping, and falling off, and can be further reduced in weight. The purpose is to provide

  In order to achieve the above object, the liner of the present invention is attached to a portion such as a hopper or chute where an object falling from its end hits when moving an object such as iron ore on a belt conveyor, and the hopper or chute A urea resin layer, a mounting bolt with a head embedded in the urea resin layer and a tip protruding from the back surface of the urea resin layer, and a surface of the urea resin layer. The structure is composed of a plurality of ceramic members embedded in the surface portion of the urea resin layer in a partially exposed state.

  When the ceramic member was used for the liner, the present inventors conducted research focusing on an elastic layer to which the ceramic member is bonded in order to prevent cracking, chipping, and dropping off of the ceramic member. As a result, when the elastic layer is made of urea resin instead of conventional rubber and urethane, the impact applied to the ceramic plate is sufficiently absorbed by the urea resin layer, preventing cracking, chipping and dropping of the ceramic member. I found what I could do. Furthermore, the present inventors have found that fixing the mounting bolt to the urea resin layer eliminates the need for a conventional metal substrate having a mounting bolt protruding on the back surface, and can further reduce the weight.

  Since the liner of the present invention is embedded in the surface portion of the urea resin layer with the ceramic member partially exposed on the surface of the urea resin layer, the impact applied to the ceramic plate is sufficiently absorbed by the urea resin layer. Further, it is possible to prevent the ceramic member from cracking, chipping and falling off. As a result, the wear resistance of the ceramic member itself can be fully utilized, and the life of the liner can be extended. Further, since the mounting bolt is fixed to the urea resin layer, the liner can be further reduced in weight.

  In particular, the ceramic member is a hexagonal column, the portion exposed from the surface of the urea resin layer is the top surface of the hexagonal column, and the maximum width of the top surface is in the range of 18 to 20 mm, The height of the hexagonal column is 60% or more of the maximum width of the top surface, the top surface is arranged in a tortoiseshell shape, and the gap between the side surfaces of the adjacent hexagonal columns of adjacent ceramic members is 1 to 3 mm. When the thickness of the urea resin layer is within a range of 1.3 to 2 times the height of the hexagonal column, the hexagonal column ceramic member is set to the gap. Since it can be distributed at a high density, for example, an object such as an iron ore having a size of about 50 mm × 50 mm × 50 mm or more can be received on the top surface of two or more ceramic members. Can disperse the impact, but only However, the impact is absorbed by the urea resin layer having the above thickness, and the ceramic member can be further prevented from cracking, chipping and dropping off. Further, since the gap between adjacent ceramic members is narrow, the object hardly hits the urea resin layer in the gap, and the urea resin layer in the gap is not lost. For this reason, the impact absorption performance of the urea resin layer is not inferior, and the ceramic member can be further prevented from falling off.

  Further, the ceramic member is a cylinder, and a portion exposed from the surface of the urea resin layer is a top surface of the cylinder, and a diameter of the top surface is within a range of 18 to 20 mm. The height is 60% or more of the diameter of the top surface, the gap between the side surfaces of adjacent cylinders of adjacent ceramic members is within a range of 1 to 3 mm, and the thickness of the urea resin layer is Even when the height is within a range of 1.3 to 2 times, the same effect as described above can be obtained.

  Further, the ceramic member is a sphere, the diameter thereof is in a range of 10 to 20 mm, adjacent ceramic members are in contact, and the surface of the urea resin layer is positioned above the contact portion. Even when the thickness of the urea resin layer is in the range of 1.3 to 1.5 times the diameter of the sphere, the same effect as described above can be obtained.

  And, when the cross-sectional shape perpendicular to the height direction of the ceramic member is different from the cross-sectional shape at a position higher than that at the intermediate portion in the height direction, the wear of the ceramic member proceeds, and When different cross-sectional shapes appear, it is possible to know when to replace the liner by visual inspection.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIGS. 1A and 1B show a first embodiment of the liner of the present invention. In this liner, a plurality of hexagonal columnar ceramic members 2 are embedded in the surface portion of the urea resin layer 1, and the top surface of each hexagonal column is exposed to the surface of the urea resin layer 1 and arranged in a turtle shell shape. I have. Further, the head portion of the mounting bolt 3 is embedded in the back surface portion of the urea resin layer 1, and the tip portion protrudes from the back surface of the urea resin layer 1.

  More specifically, as a material for forming the urea resin layer 1, a three-component urea resin can be mentioned. Moreover, as a forming material of the ceramic member 2, alumina (purity 92 to 93%) can be mentioned.

The size of the hexagonal column ceramic member 2 is not particularly limited, but when handling iron ore, coke lump, etc., the maximum width of the top surface (distance L ₁ between the opposite vertices or between the opposite sides The distance L ₂ ) is preferably in the range of 18-20 mm. When the iron ore is moved by a belt conveyor, the size of the iron ore is usually about 50 mm × 50 mm × 50 mm or more, and two or more ceramic members 2 against the collision of the iron ore etc. This is because it can be received by the top surface of the film and its impact can be dispersed. The height H _{1 of the} hexagonal column is preferably 60% or more of the maximum width of the top surface. This is to ensure the strength and life to withstand the collision of the iron ore and the like.

The gap S ₁ between the side surfaces of the opposing hexagonal columns of the adjacent ceramic members 2 is not particularly limited, but is preferably in the range of 1 to 3 mm. When the gap S ₁ is less than 1 mm, the gap S ₁ in the less urea resin layer 1 present, because there is a tendency that impact-absorbing applied to the ceramic member 2 is inferior. Conversely, when the gap S ₁ is greater than 3 mm, the greater the gap S _1, the gap per directly above iron ore to S ₁ part of urea resin layer 1, urea resin layer 1 of the gap S ₁ part This is because the impact absorption performance of the chipping or urea resin layer 1 may be inferior.

The thickness T ₁ of the urea resin layer 1 is preferably in the range of 1.3 to 2 times the height H ₁ of the hexagonal column. If the thickness T ₁ of the urea resin layer 1 is less than 1.3 times the height H ₁ of the hexagonal column, the shock absorbing performance of the urea resin layer 1 is not sufficiently exhibited, and conversely, the thickness T 1 of the urea resin layer 1 _{When 1} exceeds twice the height H ₁ of the hexagonal column, the impact absorption performance is the same as when the thickness T ₁ of the urea resin layer 1 is twice the height H ₁ of the hexagonal column, and the cost increases. Because.

  When such a liner is provided on the inner surface of the hopper or the upper surface of the chute when the iron ore is moved by the belt conveyor, the ceramic member 2 and the urea resin layer 1 combine to cause an impact of the iron ore. And the sound generated during the impact is also reduced. This can reduce noise pollution and improve the work environment.

  Furthermore, the ceramic member 2 and the urea resin layer 1 combine to prevent the ceramic member 2 from cracking, chipping and falling off, thereby extending the life of the liner. For this reason, the frequency | count of dangerous operation | work of replacement | exchange of a liner can be reduced, and productivity (moving efficiency, such as iron ore) can be improved.

  Further, since the mounting bolt 3 is fixed to the urea resin layer 1, the conventional metal substrate 14 (see FIG. 6B) in which the mounting bolt 13 protrudes on the back surface becomes unnecessary, and the liner is further increased accordingly. Weight can be reduced. Thereby, while being able to reduce the burden of the replacement | exchange operation | work of a liner, the danger of the operation | work can be reduced. Here, the reason why the mounting bolt 3 can be fixed to the urea resin layer 1 (the reason why the conventional metal substrate 14 can be made unnecessary) is that the urea resin layer 1 can be baked and bonded to the metal (bolt), and its adhesive strength This is because even the resin breaking strength can be maintained.

  Moreover, it is difficult for the particles such as iron ore to adhere to the liner. The reason is that there is no generation of rust and high rebound resilience. For this reason, the frequency | count of the removal operation | work of the deposit | attachment can be reduced, and the danger of the operation | work can be reduced. And productivity (moving efficiency of iron ore etc.) can be improved.

  Next, a method for producing the liner will be described.

  First, a material for forming the urea resin layer 1 is prepared. That is, 100 parts by weight of polyol and 30 parts by weight of isocyanate are mixed and heated to 130 ° C. to be prepolymerized. Then, 100 parts by weight of the elastomer is mixed with 130 parts by weight of the prepolymerized liquid and stirred. In this way, the material for forming the urea resin layer 1 is prepared.

  Next, the hexagonal column ceramic members 2 are arranged in the mold so that the top surface is in the shape of the turtle shell, with the top surface down. Then, the material for forming the urea resin layer 1 is once poured into the mold until the hexagonal column ceramic member 2 becomes invisible (usually about 5 mm after it disappears), and is then put into a drying furnace. Then, primary vulcanization is performed at 120 ° C. for 30 minutes to bond the urea resin layer 1 and the ceramic member 2 together. Next, the material for forming the urea resin layer 1 is additionally injected onto the surface of the primary vulcanized urea resin layer 1 taken out from the drying furnace, and the head portion of the mounting bolt 3 is additionally injected into the urea resin layer. 1 and the tip of the mounting bolt 3 is projected from the surface of the urea resin layer 1 forming material. Then, it is put in a drying furnace and vulcanized at 120 ° C. for 24 hours. Then, it demolds and the said liner can be obtained.

  2 (a) and 2 (b) show a second embodiment of the liner of the present invention. In the first embodiment, this liner uses a cylindrical member as the ceramic member 2. Other than that, it is the same as that of the said 1st Embodiment, and attaches | subjects the same code | symbol to the same part.

The size of the cylindrical ceramic member 2 is not particularly limited, but for the same reason as in the first embodiment, when handling iron ore, a coke lump or the like, the top surface diameter D ₁ is 18 to 20 mm. It is preferable to be within the range. The height H _{2 of the} cylinder is preferably 60% or more of the diameter D ₁ of the top surface. Furthermore, the gap (the narrowest part) S ₂ side of the cylinder opposite of the ceramic member 2 adjacent, preferably in the range of 1 to 3 mm. The thickness T ₂ of the urea resin layer 1 is preferably in the range of 1.3 to 2 times the height H ₂ of the cylinder.

  3 (a) and 3 (b) show a third embodiment of the liner of the present invention. This liner uses a spherical shape as the ceramic member 2 in the first embodiment. Other than that, it is the same as that of the said 1st Embodiment, and attaches | subjects the same code | symbol to the same part.

The size of the ceramic member 2 above, but the ball is not particularly limited, the first of the same reason as in the embodiment, when dealing with iron ore, lump coke and the like, the scope diameter D ₂ of the sphere is 10~20mm It is preferable to be within. Further, the adjacent ceramic members 2 are preferably in contact with each other. Since the ceramic member 2 is a sphere, the contact portion is a point, and the urea resin layer 1 is present around the contact portion, and shock absorption is obtained by the urea resin layer 1. If it is non-contact, the surface area of the urea resin layer 1 is increased, the iron ore and the like are easily hit directly, and there is a high possibility that the urea resin layer 1 is lost. The thickness T ₃ of the urea resin layer 1 is preferably in the range of 1.3 to 1.5 times the diameter D ₂ of the sphere.

  FIG. 4 shows a fourth embodiment of the liner of the present invention. In the first embodiment, the liner is formed such that the ceramic member 2 has a circular shape in which a cross-sectional shape perpendicular to the height direction of the central portion in the height direction is reduced in diameter. That is, the ceramic member 2 is formed such that the central portion in the height direction is a small-diameter cylinder 2a and the top and bottom thereof are hexagonal columns. Other than that, it is the same as that of the said 1st Embodiment, and attaches | subjects the same code | symbol to the same part.

  In the fourth embodiment, when the shape of the ceramic member 2 appearing on the liner surface is circular, it is easily known visually that the wear of the ceramic member 2 has progressed to the central portion in the height direction. be able to. In the fourth embodiment, the small-diameter column 2a is set at the center of the ceramic member 2 in the height direction, but the height position can be set as appropriate.

  As a modification of the ceramic member 2 in the fourth embodiment, for example, as shown in FIG. 5, a coaxial hollow portion 2b is formed in the lower portion of the ceramic member 2. Similarly, the wear can be visually confirmed.

  Next, examples will be described together with comparative examples. However, the present invention is not limited to the examples.

[Example 1]
[Preparation of urea resin layer forming material]
A polyol (Hodogaya Chemical Co., Ltd., PTG-2000SN) 100 parts by weight and an isocyanate (Ihara Chemical Industry Co., Ltd., Ihara ND) 30 parts by weight were mixed and heated to 130 ° C. to be prepolymerized. Then, 130 parts by weight of the prepolymerized liquid was mixed with 100 parts by weight of an elastomer (1000P, manufactured by Ihara Chemical Industry Co., Ltd.) and stirred to prepare the urea resin layer forming material (three-component urea resin).

[Production of urea resin layer]
The urea resin layer forming material was poured into a mold, which was placed in a drying furnace and vulcanized at 120 ° C. for 24 hours. And it demolded and obtained the urea resin layer.

[Comparative Example 1]
The urethane elastic layer (PTMEG type) in the conventional liner was set as Comparative Example 1.

[Comparison of physical properties of urea resin layer (Example 1) and urethane elastic layer (Comparative Example 1)]
As shown in Table 1 below, for the urea resin layer (Example 1) and the urethane elastic layer (Comparative Example 1), the hardness, tensile strength, elongation, tear strength, rebound resilience, compression set and Taber wear amount are It was measured.

  The hardness was measured according to JIS A hardness. The tensile strength was measured according to JIS K 6301. The elongation was measured according to JIS K 6301. The tear strength was measured according to JIS K 6850. The rebound resilience was measured according to JIS K 6255. The compression set was measured according to JIS K 6262. The Taber abrasion amount was measured according to JIS K 7204 (using H-18).

  From the results of Table 1 above, it can be seen that the urea resin layer (Example 1) has a higher impact absorbability than the urethane elastic layer (Comparative Example 1).

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the liner of this invention is shown typically, (a) is the top view, (b) is XX sectional drawing of (a). The 2nd Embodiment of the liner of this invention is shown typically, (a) is the top view, (b) is XX sectional drawing of (a). 3rd Embodiment of the liner of this invention is shown typically, (a) is the top view, (b) is XX sectional drawing of (a). It is sectional drawing which shows typically 4th Embodiment of the liner of this invention. It is sectional drawing which shows typically the modification of the ceramic member in the said 4th Embodiment. The conventional liner is shown typically, (a) is the top view, (b) is XX sectional drawing of (a).

Explanation of symbols

1 Urea resin layer material 2 Ceramic member 3 Mounting bolt

Claims (5)

  This is a liner that prevents wear and damage to hoppers and chutes, etc. by attaching them to parts such as hoppers and chutes where objects falling from the end of the object move when moving objects such as iron ore on a belt conveyor. Layer, a mounting bolt whose head is embedded in the urea resin layer, and a tip projecting from the back surface of the urea resin layer, and a surface portion of the urea resin layer in a state where a part is exposed on the surface of the urea resin layer And a plurality of ceramic members embedded in the liner.   The ceramic member is a hexagonal column, and the portion exposed from the surface of the urea resin layer is a top surface of the hexagonal column, and the maximum width of the top surface is within a range of 18 to 20 mm. The height of the column is 60% or more of the maximum width of the top surface, the top surface is arranged in a turtle shell shape, and the gap between the side surfaces of the adjacent hexagonal columns of adjacent ceramic members is in the range of 1 to 3 mm. The liner according to claim 1, wherein the thickness of the urea resin layer is within a range of 1.3 to 2 times the height of the hexagonal column.   The ceramic member is a cylinder, the portion exposed from the surface of the urea resin layer is the top surface of the cylinder, the diameter of the top surface is in the range of 18 to 20 mm, and the height of the cylinder Is 60% or more of the diameter of the top surface, the gap between the side surfaces of the adjacent cylinders of adjacent ceramic members is in the range of 1 to 3 mm, and the thickness of the urea resin layer is the height of the column The liner according to claim 1, which is within a range of 1.3 to 2 times.   The ceramic member is a sphere, the diameter thereof is in the range of 10 to 20 mm, adjacent ceramic members are in contact, the surface of the urea resin layer is positioned above the contact portion, The liner according to claim 1, wherein the thickness of the urea resin layer is within a range of 1.3 to 1.5 times the diameter of the sphere.   The liner according to any one of claims 2 to 4, wherein a cross-sectional shape perpendicular to the height direction of the ceramic member is different from a cross-sectional shape at a higher position at an intermediate portion in the height direction. .

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