JP2004188370A - Collision type air flow grinder, collision member and method for recycling collision member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new collision type air flow grinder which is excellent in economy, wear resistance and maintenance properties, and can efficiently grind a powder raw material. <P>SOLUTION: At least either one of an accelerating tube, an inner wall of a grinding room, an outlet part of the grinding room or a collision member of the collision type air flow grinder is composed of a material coated with a chromium alloy plating containing chromium carbide and satisfying a Vickers hardness of 900-1,300. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００３９】
【発明の効果】
以上の説明で明らかな様に、本発明の衝突式気流粉砕機によれば、その加速管、粉砕室内壁、粉砕室出口及び衝突部材の少なくともいずれかが、特定の素材によって形成されることにより、炭化ケイ素セラミック素材で形成されたものより経済的に安く、且つ耐磨耗性は炭化ケイ素セラミック品と同等であり、且つ磨耗後は表面のメッキ層を剥離し母材を磨耗量だけ再加工し再メッキ出来ることで、更に経済的に優位である。また強固な合金鋼で出来ているため、手荒く取り扱っても破損せず保全時作業性も向上した。更には、金属材料を使用することで、粉体との接触時に生じる剥離放電を予防することになり、より安全性の高い運転が可能になる（特許文献１参照）。特に、静電荷像現像用トナーの様な磨耗性が高く、且つ厳しい粒度の安定性を要求される様な粉体を製造する場合に本発明は有効である。
【図面の簡単な説明】
【図１】本発明を説明するための衝突式気流粉砕機の概略的断面図である。
【図２】本発明に用いられる衝突部材の衝突面形状を模式的に表した図である。
【図３】本発明を説明するための衝突部材の磨耗具合を模式的に表した図である。
【図４】本発明を説明するための別の衝突式気流粉砕機の概略的断面図である。
【図５】本発明を説明するための衝突部材の再生方法を模式的に表した図である。
【符号の説明】
１・・・・・被粉砕物供給口
２・・・・・高圧気体供給ノズル
３・・・・・加速管
４・・・・・衝突部材
５・・・・・排出口（粉砕室出口）
６・・・・・粉砕室内壁
１３・・・・加速管出口
１４・・・・突出中央部
１５・・・・外周衝突面
２１・・・・加速管
２２・・・・加速管スロート部
２３・・・・高圧気体供給ノズル
２４・・・・被粉砕物供給口
２５・・・・被粉砕物供給筒
２６・・・・高圧気体供給口
２７・・・・高圧気体チャンバー
２８・・・・高圧気体導入管
２９・・・・加速管出口
３０・・・・衝突部材
３２・・・・粉砕室内壁
３３・・・・粉砕物排出口（粉砕室出口）
３４・・・・粉砕室[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to an impingement airflow pulverizer for pulverizing a powder raw material using a jet airflow (high-pressure gas).
[0002]
[Prior art]
Conventionally, a collision-type air flow pulverizer using a jet stream is a method in which a powder material is put on a jet stream to form a particle mixture stream, which is jetted from an outlet of an acceleration tube, and the particle mixture stream is provided in front of an acceleration tube outlet. And crushes the powder raw material by the impact force. An example of the collision type air flow pulverizer will be described with reference to FIG.
[0003]
1 is provided with a collision member 4 opposed to an outlet 13 of an acceleration tube 3 to which a high-pressure gas supply nozzle 2 is connected. The object to be ground is introduced into the interior of the acceleration tube 3 from the object supply port 1 which is communicated on the way, and is injected together with a high-pressure gas to collide with the collision surface of the collision member 4 so that the material is pulverized by the impact. It was done.
[0004]
In such a collision-type airflow pulverizer, since the powder to be pulverized always violently collides with each device element, it is not possible to avoid wear and deterioration of each device element. In particular, in a place where a large load is applied and abrasion progresses severely, in the apparatus shown in FIG. 1, the accelerating tube 3 into which the raw material is supplied and moves at a high speed, and the collision surface of the collision member 4 where the raw material violently collide and the pulverization at the collision surface. The pulverized material further impinges on the inner wall 6 of the pulverizing chamber and the outlet 5 of the pulverizing chamber. If these members are worn out due to wear, the crushing efficiency is reduced, and the worn impurities are mixed in the product, which is not preferable. For this reason, as a constituent material of these members, alumina-based ceramics having excellent wear resistance and sintered silicon carbide ceramics have been used (see Patent Document 1). However, these ceramic materials are generally expensive, and it is extremely difficult to reuse them after abrasion, and if the surface is slightly worn as shown in FIG. 3, it must be discarded. In addition, if it is dropped carelessly, the tip and corners are easily chipped, requiring careful handling and requiring skill in maintenance work such as abrasion replacement. Furthermore, since a mold is indispensable for the production process of these ceramic materials, even a slight change in the shape requires a long production delivery time, resulting in an expensive price. As described above, there is a demand for higher quality materials in terms of economy and workability during maintenance.
[0005]
In addition, as a method of inexpensively improving the abrasion resistance performance of the impingement type air current pulverizer, an alloy pipe such as chromium molybdenum steel (SCM440, etc.) is used as a base material for the accelerating tube, the inner wall of the pulverization chamber, and the collision member. Spray coating with WC-Co (tungsten carbide-cobalt) or Ni-Cr (nickel-chromium) material, or high-speed flame spraying of these wear-resistant sprayed materials (namely HVOF) (See Non-Patent Document 1). However, these abrasion-resistant thermal spray coatings have a low intermolecular bonding force between the thermal sprayed material and the base metal, and are inferior to the above-mentioned ceramic materials in peeling and abrasion resistance.
[0006]
[Patent Document 1]
Patent No. 3085510 [Non-Patent Document 1]
“Thermal Spraying Technology Manual” published by the Japan Standards Association, pages 69-74 [0007]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a novel impingement-type airflow pulverizer capable of efficiently pulverizing powdery raw materials with excellent economy, abrasion resistance, and maintainability. Is to provide a machine.
[0008]
[Means for solving the problem]
The above object is achieved by the present invention described below.
[0009]
That is, the present invention has an accelerating tube for conveying and accelerating an object to be pulverized by a high-pressure gas, and a pulverizing chamber for finely pulverizing the object to be pulverized. In a collision type airflow pulverizer having a collision member provided opposite to,
At least one of the accelerating tube, the inner wall of the pulverizing chamber, the outlet of the pulverizing chamber, and the collision member is coated with a chromium alloy plating containing chromium carbide, and is made of a material having a Vickers hardness of 900 to 1300. Is a collision type airflow pulverizer.
[0010]
Carbon steel such as S45C or chromium molybdenum steel such as SCM material is often used for the acceleration tube, the inner wall of the crushing chamber, the outlet of the crushing chamber, and the base material of the colliding member in the impingement type air current crusher. By coating the surface of these base materials with a chromium alloy, the surface hardness is high, the wear resistance is high, and the member has a long life. Here, chromium carbide (Cr ₂₃ C ₆ ) having a strong intermolecular bonding force existing in the chromium alloy is present from the surface layer to a certain depth or more, specifically, to a depth of 5 μm or more, so that the base material surface and And the frequency of occurrence of phenomena such as peeling and cracks can be minimized.
[0011]
In the present invention, the coating of the base material surface of the chromium alloy containing chromium carbide is treated by "plating", whereby the surface can be finished uniformly and smoothly, the friction coefficient can be reduced, and the wear resistance can be improved. Become. As such a plating treatment, for example, a diklone treatment (Chiyoda Daiichi Kogyo Co., Ltd.) can be mentioned. After plating, a polishing process such as buffing or a blasting process such as shot blasting may be performed to adjust the surface roughness of the member.
[0012]
When the surface hardness is in the range of HV900 to 1300, the amount of wear on the crushed surface can be reduced as much as possible, and the frequency of replacement of members can be reduced. If the surface hardness is less than HV900, the wear resistance starts to decrease, and the pulverizing ability cannot be improved. When the surface hardness exceeds HV1300, the surface is too hard and brittle, so that peeling and cracking are likely to occur, and the frequency of replacing members starts to increase.
[0013]
[Action]
At least one of the acceleration tube, the inner wall of the crushing chamber, the outlet of the crushing chamber and the colliding member of the impingement type air current crusher is coated with a chromium alloy plating containing chromium carbide and has a Vickers hardness of 900 to 1300. With this configuration, it is possible to provide a novel collision-type airflow pulverizer that solves the problems of the prior art, is excellent in both abrasion resistance and economic efficiency, and can efficiently pulverize powder raw materials.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 4 shows an example of a collision-type pulverizer having a preferable configuration. The crusher shown in FIG. 4 will be described. The crusher includes an accelerating tube 21 for conveying and accelerating an object to be crushed by high-pressure gas, and a collision member 30 having a collision surface provided opposite to the accelerating tube. Has a Laval nozzle shape, a high-pressure gas supply nozzle 23 is disposed upstream of the throat portion of the acceleration tube 21, and a material supply port is provided between an outer wall of the high-pressure gas supply nozzle and an inner wall of the throat portion 22. The axial cross-sectional shape of the grinding chamber provided to be connected to the outlet of the pipe 21 has a circular shape.
[0015]
The pulverized material supplied from the pulverized material supply cylinder 25 is coaxial with the inner wall of the accelerating tube throat portion 22 of the accelerating tube 21 having the central axis arranged in the vertical direction, and the center is coaxial with the central axis of the accelerating tube 21. It reaches the pulverized material supply port 24 formed between the high pressure gas supply nozzle 23 and the outer wall. On the other hand, the high-pressure gas is introduced from the high-pressure gas supply port 26, passes through the high-pressure gas chamber 27, passes through one or more preferably high-pressure gas introduction pipes 28, and sharply moves from the high-pressure gas supply nozzle 23 toward the acceleration pipe outlet 29. Spouting while expanding. At this time, due to the ejector effect generated in the vicinity of the accelerating tube throat portion 22, the material to be ground is sucked from the material to be ground 24 toward the acceleration tube outlet 29 while being entrained by the gas coexisting therewith. A state of a uniform solid-gas mixed gas flow without unevenness of the dust concentration on the collision surface of the collision member 30 arranged opposite to the acceleration tube outlet 29 while rapidly accelerating while being uniformly mixed with the high-pressure gas in the acceleration tube throat portion 22. And crushed.
[0016]
In the pulverizer of FIG. 4, at least one of the accelerating tube 21, the collision member 30, the pulverization chamber outlet 33, and the pulverization chamber wall 32 is coated with a chromium alloy plating containing chromium carbide and has a Vickers hardness of 900 to 1300. The object of the present invention is achieved by being constituted by a satisfactory material. Further, as the shape of the collision member, various shapes shown in FIG. 2 can be used, and the shape having particularly high crushing efficiency is the shape shown in FIG. At this time, the apex angle α (°) of the protruding central portion 14 protruding from the collision surface of the collision member and the inclination angle β (°) of the outer peripheral collision surface 15 with respect to the vertical plane of the central axis of the accelerating tube are:
0 <α <90, β> 0
30 ≦ α + 2β ≦ 90
Is satisfied, grinding is performed very efficiently. In this shape, the shapes of the projecting central portion 14 and the outer peripheral collision surface 15 are not particularly limited, and may be appropriately selected, such as a conical shape or a pyramid shape.
[0017]
The shape of the pulverizing chamber is not limited to the shapes shown in FIGS. 1 and 4 and may be set as appropriate, and the shape of the inner wall of the pulverizing chamber may be appropriately selected accordingly.
[0018]
The configuration of the crusher itself is not limited to that of FIG. 4, and FIG. 1 illustrates a collision type air crusher of another preferable configuration. 1, the collision member 4 is provided to face the outlet 13 of the acceleration tube 3 to which the high-pressure gas supply nozzle 2 is connected. The object to be ground is introduced into the inside of the accelerating tube 3 from the object supply port 1 which is communicated with, and is injected together with a high-pressure gas to collide with the collision surface of the collision member 4 and to be ground by the impact. Things.
[0019]
Comparing the impingement type air current pulverizers of FIG. 1 and FIG. 4, the pulverizer of FIG. 4 can uniformly disperse the pulverized object in the high-pressure air stream without unevenness of the dust concentration. In addition, it is possible to more efficiently collide with the collision member, and the object to be pulverized can improve the pulverization efficiency. That is, in the pulverizer of FIG. 4, compared with the pulverizer of FIG. 1, it is possible to collide with the opposing collision member without reducing the speed of the mixed flow of the high-pressure air and the powder. The degree of wear of the collision member is also more intense than in the crusher of FIG. Therefore, it is more effective to use the members proposed in the present invention.
[0020]
In the present invention, by using a material that is preferably made of a metal based on chromium molybdenum steel, is coated with a chromium alloy plating containing chromium carbide, and has a Vickers hardness of 900 to 1300 in the present invention. The object of the present invention is more preferably achieved.
[0021]
In the present invention, the vicinity of the surfaces of the accelerating tube, the inner wall of the pulverizing chamber, the outlet of the pulverizing chamber, and the respective parts of the collision member, which are in contact with the powder material, are made of a predetermined material.
[0022]
【Example】
Hereinafter, the present invention will be described more specifically based on examples.
[0023]
Table 1 summarizes examples and comparative examples in which the impingement airflow pulverizer shown in FIG. 4 is used. The “cost” in the table is 100 when a product made of a predetermined material of the present invention is used, and the material of the comparative example is expressed as a ratio.
[0024]
<Example 1>
The collision type air-flow crusher shown in FIG. 1 was used, and the collision surface shape used was a plane shape perpendicular to the longitudinal direction of the acceleration tube. The accelerating tube, the inner wall of the crushing chamber and the collision member are made of an alloy steel based on chromium molybdenum steel (SCM440), coated with a chromium alloy plating containing chromium carbide, and have a Vickers hardness of 900 to 1300. A material satisfying the above conditions was used.
[0025]
As a pulverizing raw material, a hammer mill crushed toner for electrostatic image development (a product passed through a 1 mm screen) was used, and compressed air having a pressure of 0.59 MPa and a flow rate of 6.0 Nm ³ / min was used for pulverization. The raw material was supplied to the pulverizer at a rate of 20 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a finely pulverized product having a weight average particle size of 8 μm was obtained. As a result, when the crusher was disassembled and inspected after being operated for 24 hours continuously for one month for 24 hours a day, no trace of wear was seen on the accelerating tube and the inner wall of the crushing chamber. Near the center of the collision surface, slight traces of wear were observed. The particle size of the finely pulverized product was always stable.
[0026]
<Example 2>
The collision type air crusher shown in FIG. 4 was used. The collision surface shape had a conical protrusion with a vertical angle of 55 ° at the center and an inclination angle of 10 ° with respect to the vertical plane of the central axis of the accelerating tube on the outer periphery. One having an outer peripheral collision surface was used. The accelerating tube, the inner wall of the pulverizing chamber, the outlet of the pulverizing chamber, and the collision member are made of a chromium-molybdenum steel (SCM440) -based metal, are coated with a chromium alloy plating containing chromium carbide, and have a Vickers hardness of 900. A material satisfying 乃至 1300 was used.
[0027]
The same hammer mill crushed toner (product passed through a 1 mm screen) of the electrostatic image developing toner as in Example 1 was used as the pulverizing raw material, and compressed air with a pressure of 0.59 MPa and an air flow of 6.0 Nm ³ / min was used for pulverization. Using. The raw material was supplied to the pulverizer at a rate of 45 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a finely pulverized product having a weight average particle size of 8 μm was obtained. As a result, when the crusher was disassembled and inspected after 24 hours of continuous operation per day for one month, no trace of wear was seen on the accelerating tube and the inner wall of the crushing chamber. Slight traces of wear were observed in the vicinity. The particle size of the finely pulverized product was always stable.
[0028]
<Example 3>
In a third embodiment, a regeneration example of a collision type airflow crusher in which a collision member is worn will be described. Using the collision type air current pulverizer shown in FIG. 4, the shape of the collision surface, the accelerating tube, the inner wall of the pulverization chamber, the outlet of the pulverization chamber, and the material of the collision member were the same as those in Example 2. That is, the collision surface shape has a conical projection with a vertical angle of 55 ° in the center and an outer peripheral collision surface with an inclination angle of 10 ° with respect to the vertical plane of the central axis of the accelerating tube on the outer periphery. The material of the member was made of a metal based on chromium molybdenum steel, coated with a chromium alloy plating containing chromium carbide, and used a material having a Vickers hardness of 900 to 1300.
[0029]
The same hammer mill crushed toner (product passed through a 1 mm screen) of the electrostatic image developing toner as in Example 1 was used as the pulverizing raw material, and compressed air with a pressure of 0.59 MPa and an air flow of 6.0 Nm ³ / min was used for pulverization. Using. The raw material was supplied to the pulverizer at a rate of 45 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a finely pulverized product having a weight average particle size of 8 μm was obtained. As a result, when the crusher was disassembled and inspected after being operated for 24 months in a continuous operation for 24 hours a day, traces of wear were found on the accelerating tube and the inner wall of the crushing chamber. There were traces of wear that seemed to be scuffed, and the depth was measured to be 1.5 mm (FIG. 3). The particle size of the finely pulverized product gradually shifted to coarse after 1 month and 15 days, and the weight average particle size became 8.5 μm after 2 months.
[0030]
Next, the collision member that had been worn away in the outer peripheral collision surface was regenerated. In the regeneration method, first, the collision member was ground with a grindstone, the plated layer was roughly peeled off, and the collision member was processed until the outer shape became the same as before the wear (FIG. 5). It is important to prepare the thickness of the base portion of the collision member to be thicker by the number of times of reprocessing in anticipation of reprocessing in preparation for the reprocessing at this time. After the grinding, a chromium alloy layer containing chromium carbide was formed by plating so as to satisfy Vickers hardness of 900 to 1300.
[0031]
Next, a pulverization test after regenerating the collision member will be described. The same hammer mill crushed toner (product passed through a 1 mm screen) of the electrostatic image developing toner as in Example 1 was used as the pulverizing raw material, and compressed air with a pressure of 0.59 MPa and an air flow of 6.0 Nm ³ / min was used for pulverization. Using. The raw material was supplied to the pulverizer at a rate of 45 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a finely pulverized product having a weight average particle size of 8 μm was obtained. As a result, when the crusher was disassembled and inspected after 24 hours of continuous operation per day for one month, no trace of wear was seen on the accelerating tube and the inner wall of the crushing chamber. Slight traces of wear were observed in the vicinity. The particle size of the finely pulverized product was always stable.
[0032]
<Comparative Example 1>
The collision type air crusher shown in FIG. 1 was used, and the collision surface shape used was a planar shape perpendicular to the long axis direction of the same accelerating tube as in Example 1. As the material of the accelerating tube, the inner wall of the crushing chamber, and the collision member, a WC-Co (tungsten carbide-cobalt) material subjected to abrasion-resistant high-speed flame spraying (referred to as HVOF) on a crushed surface of chromium molybdenum steel (SCM440) was used. . The same hammer mill crushed toner (product passed through a 1 mm screen) of the electrostatic image developing toner as in Example 1 was used as the pulverizing raw material, and compressed air with a pressure of 0.59 MPa and an air flow of 6.0 Nm ³ / min was used for pulverization. Using. The raw material was supplied to the pulverizer at a rate of 20 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a pulverized fine pulverized product having a weight average particle size of 8 μm was obtained.
[0033]
As a result, after 24 hours of continuous operation per day for one month, the crusher was disassembled and inspected. As a result, a slight trace of wear was seen on the accelerating tube and the inner wall of the crushing chamber. In the vicinity of the center of the impact surface, there was a trace of abrasion, such as a digging, and the depth was measured to be 1.5 mm. The particle size of the finely pulverized product gradually shifted to coarse after 15 days, and after one month, the weight average particle size was 8.5 μm.
[0034]
<Comparative Example 2>
The collision type air crusher shown in FIG. 4 was used. The collision surface shape had a conical protrusion with a vertical angle of 55 ° at the center and an inclination angle of 10 ° with respect to the vertical plane of the central axis of the accelerating tube on the outer periphery. One having an outer peripheral collision surface was used. A silicon carbide ceramic sintered body having a volume resistivity of 10 ⁴ Ωcm and a Vickers hardness of 2,400 Kg / mm ² was used as a material of the acceleration tube, the inner wall of the grinding chamber, and the collision member.
[0035]
The same hammer mill crushed toner (product passed through a 1 mm screen) of the electrostatic image developing toner as in Example 1 was used as the pulverizing raw material, and compressed air with a pressure of 0.59 MPa and an air flow of 6.0 Nm ³ / min was used for pulverization. Using. The raw material was supplied to the pulverizer at a rate of 45 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a finely pulverized product having a weight average particle size of 8 μm was obtained. As a result, when the crusher was disassembled and inspected after operating for 24 hours a day in a continuous operation, as in Example 2, no trace of wear was seen on the accelerating tube and the inner wall of the crushing chamber. Regarding the member, a slight trace of wear was observed on the outer peripheral collision surface. The particle size of the finely pulverized product was always stable.
[0036]
<Comparative Example 3>
The collision type air crusher shown in FIG. 4 was used. The collision surface shape had a conical protrusion with a vertical angle of 55 ° at the center and an inclination angle of 10 ° with respect to the vertical plane of the central axis of the accelerating tube on the outer periphery. One having an outer peripheral collision surface was used. As the material of the accelerating tube, the inner wall of the crushing chamber, and the collision member, a WC-Co (tungsten carbide-cobalt) material subjected to abrasion-resistant high-speed flame spraying (referred to as HVOF) on a crushed surface of chromium molybdenum steel (SCM440) was used. .
[0037]
The same hammer mill crushed toner (product passed through a 1 mm screen) of the electrostatic image developing toner as in Example 1 was used as the pulverizing raw material, and compressed air with a pressure of 0.59 MPa and an air flow of 6.0 Nm ³ / min was used for pulverization. Using. The raw material was supplied to the pulverizer at a rate of 45 kg / hr by a quantitative feeder, and a long run test was performed under the condition that a finely pulverized product having a weight average particle size of 8 μm was obtained. As a result, as in Example 2, after operating for 24 hours a day in a continuous operation for 24 hours per day, the crusher was disassembled and inspected. In the case of, there was a trace of abrasion, such as abrasion, on the outer peripheral collision surface, and when the depth was measured, it was 1.5 mm (FIG. 3). The particle size of the finely pulverized product gradually shifted to coarse after 15 days, and after one month, the weight average particle size was 8.5 μm.
[0038]
[Table 1]

[0039]
【The invention's effect】
As is clear from the above description, according to the collision type airflow pulverizer of the present invention, at least one of the accelerating tube, the pulverization chamber inner wall, the pulverization chamber outlet, and the collision member is formed by a specific material. , It is economically cheaper than silicon carbide ceramic material, and has the same abrasion resistance as silicon carbide ceramic products. After abrasion, the surface plating layer is peeled off and the base material is reworked by the amount of wear. Re-plating is more economical. In addition, since it is made of strong alloy steel, it is not damaged even when handled roughly, and workability during maintenance has been improved. Furthermore, by using a metal material, peeling discharge occurring at the time of contact with powder can be prevented, and a safer operation can be performed (see Patent Document 1). In particular, the present invention is effective for producing a powder having a high abrasion property such as a toner for developing an electrostatic image and requiring a strict particle size stability.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a collision-type airflow pulverizer for explaining the present invention.
FIG. 2 is a diagram schematically illustrating a collision surface shape of a collision member used in the present invention.
FIG. 3 is a diagram schematically showing the degree of wear of a collision member for explaining the present invention.
FIG. 4 is a schematic cross-sectional view of another impingement airflow pulverizer for explaining the present invention.
FIG. 5 is a view schematically showing a method of reproducing a collision member for explaining the present invention.
[Explanation of symbols]
1 ·········································································································
6 ... Crushing chamber inner wall 13 Accelerator tube outlet 14 Projecting central portion 15 Outer peripheral collision surface 21 Accelerator tube 22 Accelerator tube throat portion 23 High pressure gas supply nozzle 24 High pressure gas supply port 25 High pressure gas supply port 27 High pressure gas chamber 28 High pressure gas inlet pipe 29 Accelerator pipe outlet 30 Collision member 32 Crushing chamber inner wall 33 Crushed material discharge port (Crushing chamber outlet)
34 ・ ・ ・ ・ Crushing room

Claims (6)

It has an accelerating tube for conveying and accelerating the object to be pulverized by high-pressure gas, and a pulverizing chamber for finely pulverizing the object to be pulverized, and is provided in the pulverizing chamber so as to face an opening surface of an outlet of the accelerating tube. In a collision type air flow pulverizer having a collision member,
At least one of the accelerating tube, the inner wall of the pulverizing chamber, the collision member or the outlet of the pulverizing chamber has a chromium alloy layer containing chromium carbide on the surface, and a chromium alloy layer containing the chromium carbide A Vickers hardness of 900 to 1300. An outer peripheral collision surface is provided around the central portion of the projection in order to further crush the primary crushed material crushed at the central portion of the projection by the collision with the central portion of the collision member projecting from the collision surface. The impingement-type airflow pulverizer according to claim 1, wherein a chromium alloy layer containing chromium carbide is provided on a surface on which the object to be pulverized or the primary pulverized object of the object to be pulverized collides. The impingement type air current crusher according to claim 1 or 2, wherein the chromium alloy layer containing chromium carbide is formed by plating. In a collision member used for a crusher that crushes and crushes an object to be crushed, a portion where the object to be crushed collides contains chromium carbide, and has a chromium-containing layer having a Vickers hardness of 900 to 1300, Collision member. A collision member used in a crusher that crushes and crushes an object to be crushed, wherein the collision member has a projecting central portion as a projecting collision surface and an outer peripheral collision surface around the projecting central portion. A collision member comprising a chromium alloy layer containing chromium carbide and having a Vickers hardness of 900 to 1300 on a portion and an outer peripheral collision surface. When a collision member having a chromium alloy layer containing chromium carbide and having a Vickers hardness of 900 to 1300 is worn or peeled off by use, part or all of the chromium alloy layer is removed, and the chromium carbide is contained. A method for reproducing a collision member, wherein a chromium-containing layer having a hardness of 900 to 1300 is formed by plating.

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