WO2016023501A1 - 一种干式风磁选机 - Google Patents

一种干式风磁选机 Download PDF

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Publication number
WO2016023501A1
WO2016023501A1 PCT/CN2015/086827 CN2015086827W WO2016023501A1 WO 2016023501 A1 WO2016023501 A1 WO 2016023501A1 CN 2015086827 W CN2015086827 W CN 2015086827W WO 2016023501 A1 WO2016023501 A1 WO 2016023501A1
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magnetic
magnetic separator
casing
roller
separator according
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PCT/CN2015/086827
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English (en)
French (fr)
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张珂
张进才
胡沿东
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张珂
张进才
胡沿东
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Publication of WO2016023501A1 publication Critical patent/WO2016023501A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for

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  • the invention relates to a magnetic separator, in particular to a dry wind magnetic separator, which is mainly used in the field of magnetite magnetic separation.
  • China's iron ore resources have two characteristics: First, there are many poor ore, about 80% of mineral resources, and second, there are many symbiotic composite ores. Smelting enterprises reduce costs and save energy consumption. More concentrate powder is used, that is, the original ore is crushed, ground, magnetically selected, flotation and other procedures to remove gangue minerals, and iron fine powder with iron grade higher than 60% is selected for smelting.
  • wet magnetic separator for wet magnetic separation
  • wet magnetic separation will consume water resources, processing 1 to 1.5 tons of water per ton of raw ore, need to build tailings dam, and discharge sewage contaminated land.
  • water sources in the western water-deficient, water-free areas can not be used for mineral processing.
  • a dry magnetic separator is generally used. As shown in FIG. 1 and FIG. 2, the material containing the mineral powder to be selected is injected into the feed port 11 of the vibration feed tank, and the rotary sleeve 10 is fixed around The magnetic shaft 9 rotates.
  • the magnetic shaft 9 is mounted with a plurality of sets of magnetic blocks 12, the magnetic component formed on the surface of the rotating sleeve 10 adsorbs the magnetic components in the material, and when the rotating sleeve 10 rotates, when the adsorbed magnetic components leave After the magnetic block 12, when the surface magnetic field of the rotary sleeve 10 is weakened or disappears, the magnetic component is separated from the rotary sleeve 10 and discharged from the rear discharge port 6, thereby achieving the purpose of magnetic separation.
  • the rotating sleeve rotates for one week, the effective adsorption working time of the magnetic material is short, the number of inversions on the magnetic roller is small, the magnetic wrapping and magnetic agglomeration are serious, and it is difficult to achieve magnetic separation.
  • the selected iron ore grade is low and the selection ratio is low.
  • the present invention provides a dry wind magnetic separator comprising a housing having a feed opening and a discharge opening, wherein the housing is provided with a non-full magnetic magnetic roller, and the housing is provided with a suction
  • the air outlet is opposite to the magnetic field of the magnetic roller.
  • the invention combines the wind and the magnetic force to solve the magnetic wrapping and the magnetic agglomeration with a very short distance, which is beneficial to the separation of the magnetic material and the non-magnetic material, and improves the grade and the selection ratio of the selected iron ore.
  • the present invention does not require water, no water pollution; and the dust is collected without air pollution.
  • the feed port is located at the top of the housing, and the discharge port is located at the bottom of the housing.
  • the discharge port is divided into a ferromagnetic outlet and a non-ferromagnetic outlet, and the selected magnetic material and non- The magnetic material is discharged from the ferromagnetic outlet and the non-ferromagnetic outlet, respectively.
  • the processing capacity of the magnetic separator is improved while satisfying the sorting grade and the selection ratio.
  • the lower portion of the housing is provided with a plenum.
  • a partitioning guide plate is disposed on the casing below the magnetic roller.
  • the plurality of magnetic rollers are plural, and the plurality of magnetic rollers are longitudinally arranged with each other.
  • the mineral can be subjected to multiple magnetic separations, which improves the processing capacity of the beneficiation and improves the selected iron ore grade.
  • the longitudinally arranged magnetic rollers may be arranged in a horizontally offset manner from top to bottom, or may be vertically arranged, or may be arranged in a horizontally offset manner and then vertically.
  • a guide baffle is disposed between the adjacent two magnetic rollers.
  • the guide baffle can collect the non-magnetic material or magnetic material selected in the upper stage and perform the next magnetic separation again.
  • a scraper plate is disposed in the axial direction of the magnetic roller.
  • the scraper plate allows the magnetic material on the magnetic roller to be effectively peeled off when it is transferred into the non-magnetic region.
  • the invention can effectively improve the selected iron ore grade, especially for fine-grain low-grade ore with a particle diameter of less than 120 mesh and -200 mesh, 70% to 85%, and the fine powder taste can reach 67% or more.
  • the selection ratio of the present invention is high, and the ratio of the original ore of 20% to 28% of the grade is up to (2.7 to 3):1.
  • the invention does not require water, no water pollution
  • the invention is dust-free operation, and the dust emission is less than 30 mg/m 3 , which is superior to the requirement of the particulate matter of the national standard “Integrated Emission Standard of Air Pollutants” of less than 150 mg/m 3 , and no air pollution.
  • the processing amount of the present invention is large, such as a CXJ1024 (105*200 cm) magnetic separator, and the processing amount is greater than 60 t/h.
  • FIG. 1 is a schematic structural view of a conventional magnetic separator
  • FIG. 2 is a schematic cross-sectional view showing a magnetic roller of a conventional magnetic separator
  • Figure 3 is a schematic view showing the structure of the first and second embodiments of the present invention.
  • Figure 4 is a schematic structural view of a third embodiment of the present invention.
  • Figure 5 is a schematic view showing the structure of a fourth embodiment of the present invention.
  • Example 1 The magnetite in a certain area of Xinjiang is located in the desert without water, the raw ore is coarsely broken, mediumly crushed and pre-selected with 26 ⁇ 28% of the original ore with integrated grade, and then treated by grinding to a particle size of less than 120 mesh, and - 200 mesh to 70% to 85% of the fine material is fed to the dry magnetic separator of the present invention (as shown in FIG. 3), and the dry magnetic separator includes a shell with a feed port 11 and a discharge port 6, 7.
  • the housing 1 is provided with a magnetic roller 2 which is not fully magnetized, and the housing 1 is provided with an air outlet 4 which is opposite to the magnetic area of the magnetic roller 2, and the magnetic field of the magnetic roller forms a negative pressure. After the material enters from the feed port 11, the magnetic substance is adsorbed on the rotating magnetic roller 2, and the non-magnetic substance falls under the action of gravity.
  • the selected iron ore grade is 67%, the selection ratio can reach 2.7:1, and the dust emission is less than 30 mg/m 3 .
  • Embodiment 2 The magnetic separator shown in FIG. 3 includes a casing 1 having a feed port 11 and a discharge port 6, 7 in which a non-fully magnetic magnetic roller 2 is disposed, the casing
  • the body 1 is provided with an air outlet 4 which is opposed to the magnetic zone of the magnet roller 2.
  • the feed port 11 is provided at the top of the casing 1, and the discharge ports 6, 7 are provided at the bottom of the casing 1.
  • a plenum 5 is provided in the lower portion of the casing 1.
  • the ferromagnetic material After the material enters from the feed port 11, the ferromagnetic material is adsorbed onto the rotating magnetic roller 2. When the magnetic roller 2 is turned to the non-magnetic region, the ferromagnetic material falls by gravity to the ferromagnetic outlet at the bottom of the shell. 6. The non-ferromagnetic material falls into the non-ferromagnetic material outlet 7 by gravity, and the air supply port 5 increases the effective contact of the magnetic roller 2 with the material and increases the magnetization time.
  • the selected iron ore grade is 68%, the selection ratio can reach 3:1, and the dust emission is less than 30 mg/m 3 .
  • the processing capacity of CXJ1024 (105*200cm specification) reached 60t/h.
  • Embodiment 3 a magnetic separator as shown in FIG. 4, comprising a housing 6, 7 having a feed port 11 and a discharge port, wherein the housing 1 is provided with a magnetic roller 2 which is not fully magnetized, the housing An air vent 4 is provided on the first side, and the air vent 4 is opposed to the magnetic zone of the magnetic roller 2.
  • the feed port 11 is located at the top of the housing 1, and the discharge ports 6, 7 are located at the bottom of the housing 1.
  • the magnetic roller 2 is three, three magnetic rollers 2 are longitudinally disposed, and are arranged in a staggered manner in the horizontal direction.
  • the housing 1 below the magnetic roller 2 is provided with a partitioning guide plate 3, adjacent to two A guide flap 13 is provided on the housing between the magnet rollers 2.
  • a plenum 5 is provided in the lower portion of the casing 1.
  • the magnetic substance After the material enters the casing 1 and is magnetically selected by the first magnetic roller 2, the magnetic substance is transferred into the non-magnetic region, and falls into the ferromagnetic outlet 6 under the action of gravity, and the non-magnetic substance is in the guiding baffle 13 and the separating guide plate 3. Under the guidance, it falls again on the magnetic zone of the second magnet roller 2, performs a second magnetic separation, and repeats the above steps for the third magnetic separation, finally obtaining ferromagnetic and non-ferromagnetic materials.
  • the selected magnetic material has a grade of 70%, a selection ratio of 2.8:1, and a dust emission of less than 30 mg/m 3 .
  • the throughput of CXJ1024 (105*200cm specification) reached 65t/h.
  • Embodiment 4 The magnetic separator shown in FIG. 5 includes a casing 1 with a feed port 11 and a discharge port 6, 7 in which a magnetic roller 2 which is not fully magnetized is disposed.
  • the body 1 is provided with an air outlet 4 which is opposed to the magnetic zone of the magnet roller 2.
  • the feed port 11 is located at the top of the housing 1, and the discharge ports 6, 7 are located at the bottom of the housing 1.
  • the magnetic roller 2 is two, the two magnetic rollers 2 are arranged along the same vertical line, and the partitioning guide plate 3 is disposed on the casing 1 below the magnetic roller 2, and the adjacent two magnetic rollers are disposed.
  • a guide flap 13 is provided on the housing 1 between the two.
  • a plenum 5 is provided in the lower portion of the casing 1.
  • the ferromagnetic material After the material enters the casing 1 and is magnetically selected by the first magnetic roller 2, the ferromagnetic material is transferred into the non-magnetic region and then separated from the magnetic roller 2, and the second magnetic separation is performed under the guidance of the guiding baffle 13 and the separating guide plate 3. The non-magnetic material falls into the non-ferromagnetic outlet 7 by the action of gravity.
  • the selected magnetic material has a grade of 71%, a selection ratio of 2.9:1, and a dust emission of less than 30 gm/m 3 .
  • the throughput of CXJ1024 (105*200cm specification) reached 68t/h.
  • the magnetic separator shown in FIG. 4 and FIG. 5 includes a housing 1 with a feed port 11 and a discharge port 6, 7 in which a non-fully magnetic magnetic roller 2 is disposed.
  • An air vent 4 is provided on the first side, and the air vent 4 is opposed to the magnetic zone of the magnetic roller 2.
  • the feed port 11 is located at the top of the housing 1, and the discharge ports 6, 7 are located at the bottom of the housing 1.
  • the magnetic roller 2 has five, the five magnetic rollers 2 are longitudinally arranged from top to bottom, the upper three are staggered in the same direction in the horizontal direction, and the lower two are vertically arranged, and the shell below the magnetic roller 2
  • the body 1 is provided with a partitioning guide plate 3, and a guide baffle 13 is provided on the casing between the adjacent two magnet rollers 2. Further, a scraper plate 8 is provided on the magnet roller 2. And a plenum 5 is provided at the bottom of the casing 1.
  • the material is magnetically selected after passing through three longitudinally disposed magnetic rollers 2 which are staggered in the same horizontal direction, and then magnetically aligned by two magnetic rollers 2 arranged along the same vertical line.
  • a plurality of different magnetites are subjected to a sorting test, and the ore grade is 4 to 10%, 10 to 20%, and 20 to 30%, and the dry magnetic separator CXJ1024 of the present embodiment is fed ( 105*200cm specification), the particle size is 0 ⁇ 0.125, 0 ⁇ 0.15, 0 ⁇ 0.2mm, the iron grade of iron fine powder is 73%, the ratio is (2.7 ⁇ 3.0):1, and the dust emission is less than 30mg/m. 3 , the processing volume is greater than 70t / h.

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  • Manufacture And Refinement Of Metals (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

一种干式风磁选机，包括带有进料口（11）、出料口（6、7）的壳体（1），壳体（1）内设置有非全磁磁辊（2），其特征在于：所述壳体（1）上设置有抽风口（4），所述抽风口（4）与磁辊（2）的磁区相对。该干式风磁选机能够有效的提高选出的铁矿品位，特别是对于粒径小于120目且-200目占70%～85%细粒低品位原矿，精粉品味可达到67%及以上，且选比高，无污染，处理量大。

Description

一种干式风磁选机 技术领域：
本发明涉及一种磁选机，尤其涉及一种干式风磁选机，主要应用于磁铁矿磁选领域。
背景技术：
我国铁矿资源有两个特点：一是贫矿多，约为矿产资源的80％，二是共生复合矿石多，冶炼企业为降低成本，节约能源消耗。多采用精矿粉，即将原矿石进行破碎、磨矿、磁选、浮选等程序剔除脉石矿物，选出铁品位高于60％的铁精粉用于冶炼。
在选矿中，目前主要工艺是采用湿式磁选机进行湿式磁选，但是湿式磁选会消耗水资源，处理每吨原矿消耗水1～1.5吨，需建尾矿坝，同时排出的污水污染土地和水源，在西部缺水、无水地区无法进行选矿。
为了解决上述问题，目前普遍采用干式磁选机，如图1和图2所示，将含有待选矿粉的物料注入到震动给料槽的进料口11中，旋转套筒10围绕固定的磁轴9旋转，由于磁轴9上安装有多组磁块12，通过旋转套筒10表面形成的磁场将物料中的磁性成分吸附，在旋转套筒10旋转中，当被吸附的磁性成分离开磁块12后，旋转套筒10表面磁场减弱或消失时，磁性成分脱离旋转套筒10从后面的出料口6排出，达到磁选的目的。所述的干式磁选机磁选过程中，旋转套筒旋转一周，磁性材料的有效吸附工作时间短，在磁辊上的翻转次数少，磁包裹、磁团聚现象严重，很难达到磁选的预期效果。选出的铁矿品位低，选比低。
发明内容：
本发明的目的在于提供一种能有效提高产品品位和选比的干式风磁选机。
为了实现该目的，本发明提供了一种干式风磁选机，包括带有进料口和出料口的壳体，壳体内设置有非全磁磁辊，所述壳体上设置有抽风口，所述抽风口与磁辊磁区相对。本发明使风力和磁力共同作用，以极短的距离解决磁包裹、磁团聚，利于磁性物与非磁性物的分离，提高了选出的铁矿的品位和选比。同时，本发明不需要水，无水污染；且粉尘被收集，无空气污染。
为了进一步提高磁选机的处理量，所述进料口位于壳体顶部，所述出料口位于壳体底部。所述出料口分为铁磁物出口和非铁磁物出口，选出的磁性物料和非 磁性物料分别从铁磁物出口和非铁磁物出口排出。在不额外增加动力的情况下，满足分选品位和选比的同时，提高了磁选机的处理量。
为了进一步增加物料和磁性区域的有效接触，所述壳体下部设置有补风口。
为了进一步有效的将选出的带磁性和不带磁性的物料分离，并使之向特定方向移动，磁辊下方的壳体上设置有分隔导向板。
为了进一步提高选出的铁矿品位和处理量，所述磁辊为多个，且所述多个的磁辊相互之间为纵向排列。使得矿物能够进行多次磁选，在提高了选矿的处理量的同时也提高了选出的铁矿品位。
进一步描述，所述纵向排列的磁辊可以为从上至下沿水平方向错开排列，也可以垂直排列，也可以先沿水平方向错开排列再垂直排列。
为了进一步收集上一级磁辊选出的物料，在相邻两个磁辊之间设置有导向挡板。导向挡板能够对上一级选出的非磁性物料或磁性物料进行收集，再次进行下一次磁选。
为了进一步让物料能够容易的从磁辊上剥落，在所述磁辊轴向上设置有刮料板。刮料板能够让磁辊上的磁性物质在转入非磁性区域的时候有效的剥离。
有益效果：
1.本发明能够有效的提高选出的铁矿品位，特别是对于粒径小于120目且-200目占70％～85％细粒低品位原矿，精粉品味可达到67％及以上。
2.本发明的选比高，对于品位20％～28％的原矿，选比可达(2.7～3)∶1。
3.本发明无需用水，无水污染；
4.本发明为无尘运行，粉尘排放小于30mg/m3，优于国家标准《大气污染物综合排放标准》规定的颗粒物小于150mg/m3的要求，无空气污染。
5.本发明的处理量大，如CXJ1024(105*200cm)规格的磁选机，处理量大于60t/h。
附图说明：
图1为现有的磁选机结构示意图；
图2为现有的磁选机磁辊的截面布置示意图；
图3为本发明的第一种和第二种实施例的结构示意图；
图4为本发明的第三种实施例的结构示意图；
图5为本发明的第四种实施例的结构示意图。
具体实施方式：
下面将通过附图中所示的实施例来介绍本发明，但本发明并不局限于所介绍的实施方式，任何在本实施例基本精神上的改进或替代，仍属于本发明权利要求所要求保护的范围。
实施例1：新疆某地磁铁矿、地处沙漠无水、原矿经粗破、中碎并预选富集成品位26～28％的原矿，再经磨矿处理成粒度控制在小于120目，且-200目占70％～85％的细料喂入本发明的干式磁选机(如图3所示)，干式磁选机包括带有进料口11、出料口6、7的壳体1，壳体内1设置有非全磁的磁辊2，所述壳体1上设置有抽风口4，所述抽风口4与所述磁辊2的磁区相对，磁辊磁区形成负压。物料从进料口11进入以后，磁性物质吸附在旋转的磁辊2上，非磁性物质在重力的作用下落下。
采用本实施例所述的磁选机，其选出的铁矿品位为67％，其选比可达到2.7∶1，其粉尘排放量小于30mg/m3。
实施例2：如图3所示的磁选机，包括带有进料口11、出料口6、7的壳体1，壳体1内设置有非全磁的磁辊2，所述壳体1上设置有抽风口4，所述抽风口4与所述磁辊2的磁区相对。所述进料口11设置在壳体1顶部，所述出料口6、7设置在壳体1底部。另外，在所述壳体1下部还设置了补风口5。
在物料从进料口11进入以后，铁磁物被吸附到旋转的磁辊2上，当磁辊2转到非磁性区域时，铁磁物在重力的作用下落入壳底的铁磁物出口6，非铁磁物在重力的作用下落入非铁磁物出口7，补风口5增加了磁辊2与物料的有效接触并且增加了选磁时间。
采用本实施例所述的磁选机，其选出的铁矿品位为68％，其选比可达到3∶1，其粉尘排放量小于30mg/m3。CXJ1024(105*200cm规格)处理量达到了60t/h。
实施例3：如图4所示的磁选机，包括带有进料口11、出料口的壳体6、7，壳体1内设置有非全磁的磁辊2，所述壳体1上设置有抽风口4，所述抽风口4与所述磁辊2的磁区相对。所述进料口11位于壳体1顶部，所述出料口6、7位于壳体1的底部。所述磁辊2为三个，三个磁辊2呈纵向设置，且在水平方向错开排列，在所述磁辊2的下方的壳体1上设置有分隔导向板3，在相邻两个磁辊2之间的壳体上设置有导向挡板13。另外，在所述壳体1下部还设置了补风口5。
物料进入壳体1以后经过第一个磁辊2选磁后，磁性物质转入非磁性区域，在重力的作用下落入铁磁物出口6，非磁性物质在导向挡板13和分隔导向板3 的引导下再次落在第二个磁辊2的带磁区，进行第二次磁选，再重复上述步骤进行第三次磁选，最后得到铁磁物和非铁磁物。
采用本实施例所述的磁选机，其选出的磁性物料的品位为70％，其选比为2.8∶1，其粉尘排放量小于30mg/m3。CXJ1024(105*200cm规格)处理量达到了65t/h。
实施例4：如图5所示的磁选机，包括带有进料口11、出料口6、7的壳体1，壳体1内设置有非全磁的磁辊2，所述壳体1上设置有抽风口4，所述抽风口4与所述磁辊2的磁区相对。所述进料口11位于壳体1顶部，所述出料口6、7位于壳体1的底部。所述磁辊2为两个，所述的两个磁辊2沿同一垂直线排列，在所述磁辊2的下方的壳体1上设置了分隔导向板3，在相邻两个磁辊2之间的壳体1上设置有导向挡板13。另外，在所述壳体1下部还设置了补风口5。
物料进入壳体1以后经过第一个磁辊2选磁后，铁磁物转入非磁性区域后脱离磁辊2，在导向挡板13和分隔导向板3的引导下进行第二次磁选，非磁性物则在重力的作用下落入非铁磁物出口7。
采用本实施例所述的磁选机，其选出的磁性物料的品位为71％，其选比为2.9∶1，其粉尘排放量小于30gm/m3。CXJ1024(105*200cm规格)处理量达到了68t/h。
实施例5：
结合图4和图5所示的磁选机，包括带有进料口11、出料口6、7的壳体1，壳体1内设置有非全磁的磁辊2，所述壳体1上设置有抽风口4，所述抽风口4与所述磁辊2的磁区相对。所述进料口11位于壳体1顶部，所述出料口6、7位于壳体1的底部。所述磁辊2有五个，所述五个磁辊2从上至下为纵向排列，上三个沿水平同一方向错开排列，下两个则垂直排列，在所述磁辊2下方的壳体1上设置有分隔导向板3，在相邻两个磁辊2之间的壳体上设置有导向挡板13。另外，在所述磁辊2上设置有刮料板8。并且在所述壳体1底部设置有补风口5。
物料在经过三个纵向设置，沿同一水平方向错开排列的磁辊2磁选后，再经两个沿同一垂直线排列的磁辊2磁选。
在小型工业试验装置中对多种不同磁铁矿进行选别试验，原矿铁品位为4～10％、10～20％、20～30％，喂入本实施例的干式磁选机CXJ1024(105*200cm规格)，粒度为0～0.125、0～0.15、0～0.2mm，产出铁精粉铁品位73％，选比达到(2.7～3.0)∶1，其粉尘排放量小于30mg/m3，处理量大于70t/h。

Claims (10)

  1. 一种干式风磁选机，包括带有进料口(11)、出料口(6、7)的壳体(1)，壳体(1)内设置有非全磁磁辊(2)，其特征在于：所述壳体(1)上设置有抽风口(4)，所述抽风口(4)与磁辊(2)的磁区相对。
  2. 如权利要求1所述的风磁选机，其特征在于：所述进料口(11)位于壳体(1)顶部，所述出料口(6、7)位于壳体(1)底部。
  3. 如权利要求1或2中任一项所述的风磁选机，其特征在于：所述壳体(1)下部设置有补风口(5)。
  4. 如权利要求1、2或3所述的风磁选机，其特征在于：在所述磁辊(2)下方的壳体(1)上设置有分隔导向板(3)。
  5. 如权利要求1、2、3或4所述的风磁选机，其特征在于：所述磁辊(2)为多个，且所述多个的磁辊(2)相互之间为纵向排列。
  6. 如权利要求5所述的风磁选机，其特征在于：所述纵向排列的磁辊(2)为从上至下沿水平方向错开排列。
  7. 如权利要求5所述的风磁选机，其特征在于：所述纵向排列的磁辊(2)为垂直排列。
  8. 如权利要求5所述的风磁选机，其特征在于：所述纵向排列的磁辊(2)为从上至下先为沿水平方向错开排列再为垂直排列。
  9. 如权利要求5、6、7或8所述的风磁选机，其特征在于：在相邻两个磁辊(2)之间的壳体(1)上设置有导向挡板(13)。
  10. 如上述权利要求中任一项所述的风磁选机，其特征在于：在所述磁辊(2)轴向上设置有刮料板(8)。
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