JP6062283B2 - Kneading machine - Google Patents

Description

The present invention relates to a kneading machine for stirring the kneaded material rubber raw material.

  2. Description of the Related Art Conventionally, a closed kneader is known in which a kneaded material that is a raw material of a tire or the like made of rubber, plastic, or the like press-fitted into a kneading chamber is stirred by rotation of a rotor shaft. In such a kneader, when the kneaded material is kneaded, wear due to the kneaded material occurs on the rotor and the inner surface of the kneading chamber.

Here, Patent Document 1 discloses a rotor in which a thermal spray coating of cermet is laminated on the surface in a kneader to achieve wear resistance, corrosion resistance, and the like, and Patent Document 2 forms a sprayed layer on the surface to provide resistance to resistance. A rotor with improved wear is described.
In addition, until now, the inner surface of the kneading chamber has been subjected to chromium plating or build-up welding to impart wear resistance to the kneading chamber, thereby improving the life of the kneading machine.

  By the way, in recent years, demand for environmental protection has increased the demand for tires that can improve the fuel efficiency of vehicles, so-called eco-tires. An eco tire is a tire that can reduce rolling resistance without sacrificing the wear resistance and grip force of the tire, and silica is added to a raw material used for such an eco tire.

Japanese Patent No. 4264219 Japanese Patent No. 2638256

  However, when the raw material of the tire added with silica is kneaded in the kneading chamber as a kneading material, the inner surface of the kneading chamber is likely to wear, and in this case, sufficient wear resistance is achieved by conventional chromium plating and overlay welding. There are problems such as inability to get sex. Here, it is possible to improve the abrasion resistance by applying the thermal spray coating described in Patent Documents 1 and 2 to the inner surface of the kneading chamber, but the inner surface of the kneading chamber is completely different from the shape of the rotor surface, It is difficult to apply.

The present invention has been made in view of such problems, and an object of the present invention is to provide a kneader capable of reducing the cost and sufficiently obtaining the wear resistance of the kneaded material.

In order to solve the above problems, the present invention employs the following means.
That is, the kneader according to the present invention is a kneader in which a kneading material is housed in a kneading chamber and kneaded by a kneading rotor, and includes at least one partition member that partitions the kneading chamber and the outside, Covering the inner surface facing the kneading chamber, covering the edge of the hard coating with the hard coating formed of a material having wear resistance to the kneading material, and the inner surface of the partition member, A protective member made of a material that is tougher than the material to be formed, the partition member covering the kneading chamber and opening upward from the kneading chamber, and the kneading chamber A chamber formed with a lower opening that opens downward from the top, a floating weight that can be moved up and down to open and close the upper opening, and a vertical movement that can open and close the lower opening Drops provided in Has a door, wherein the protective member, the chamber, the floating weight, and is provided on all edges of the hard film provided on each of the drop door, the protective member, the There are formed a first surface and two surfaces that are two surfaces facing the inner surface side, and a step surface that is a surface facing the circumferential direction of the kneading rotor disposed between the first surface and the second surface. The edge portion is formed with a surface corresponding to the first surface, the second surface, and the step surface, and has a stepped shape so that the edge portion is fitted with the protective member. The first surface is in contact with the hard coating, and the second surface is in contact with the inner surface.

According to such a kneading machine, by covering the inner surface of the partition member with a hard film, the adhesion to the partition member as the base material is good and the hardness can be secured, so the wear of the partition member by the kneading material Can be sufficiently suppressed. In addition, by using such a hard coating, construction is easier and cost merit is achieved as compared with the case where overlay welding is performed on the inner surface of the partition member.
Furthermore, when trying to obtain the same wear resistance as overlay welding, the film thickness can be made very thin, so even if it wears, a very large uneven shape is formed on the inner surface of the partition member And the deterioration of the performance of the kneader is unlikely to occur due to the unevenness of the inner surface due to such wear. On the other hand, such a hard coating has low toughness, and cracks and chips are likely to occur especially at the edges, but since these edges are covered with a protective member made of a material with high toughness, cracks and chips at the edges are suppressed. can do. Furthermore, since a hard film is applied to the inner surfaces of the chamber and the open / close member and a protective member is provided at the edge of the hard film, wear from the kneading material in the kneading chamber can be reliably suppressed.

  Furthermore, the protection member may be fixed to the partition member with a bolt.

  Since the protective member is not deformed by heat generated by welding or the like by fixing the protective member with bolts in this manner, the protective member can be installed with higher accuracy. Furthermore, since the replacement of the protection member is easy and a material that cannot be installed by welding can be used for the protection member, the choice of materials is expanded.

  Furthermore, a material containing silica as the kneading material may be kneaded, and the hard coating may be formed of a material having wear resistance with respect to the silica.

  Thus, for example, when kneading a silica-containing kneading material used in eco-tires, high wear resistance is required on the inner surface of the partition member. Wear on the inner surface of the member can be suppressed.

  The hard coating may be a cermet coating containing tungsten carbide.

  By using such a hard film, a very hard film can be generated on the inner surface of the partition member, and wear of the partition member due to the kneaded material can be sufficiently suppressed.

  Furthermore, the hard coating may be a spray coating of a self-fluxing alloy.

  By using such a hard film, it is possible to generate a hard film on the inner surface of the partition member and to obtain a certain degree of toughness, while suppressing cracks and chips of the hard film itself to some extent, Wear of the partition member due to the kneaded material can be suppressed.

  The hard coating may be a ceramic coating by a sol-gel method.

  By using such a hard film, a very hard film can be generated on the inner surface of the partition member, and wear of the partition member due to the kneaded material can be sufficiently suppressed.

  Furthermore, the protective member may use an alloy material having a Vickers hardness of Hv 700 or less as the high toughness material.

  Thus, since the protective member is made of an alloy having a Vickers hardness of Hv 700 or less, the hardness value of the protective member can be made smaller than the hard film on the inner surface of the partition member. Can be more reliably suppressed.

  The kneading machine member according to the present invention is a kneading machine member that is used in a kneading machine in which a kneading material is housed in a kneading chamber and kneaded by a kneading rotor and can be worn by the kneading material. A hard coating formed of a material, a hard coating covering a surface of the base material on the side of the kneading material and having wear resistance to the kneading material, and an edge of the hard coating on the surface of the base material And a protective member made of a material having higher toughness than the material forming the hard coating.

  According to such a kneading machine member, the adhesion to the base material serving as the base material is good and the hardness can be secured, so that the wear of the base material can be sufficiently suppressed. In addition, the use of such a hard coating is easy and cost-effective, and the film thickness can be made very thin. In other words, the performance of the kneader is less likely to deteriorate. In addition, since the edge is provided with a protective member made of a material having high toughness, it is possible to suppress cracks and chips at the edge of the hard coating.

  According to the kneading machine and the kneading member of the present invention, the inner surface of the partition member or the base material is covered with a hard film, and the edge of the hard film is further covered with a protective member. Sufficient wear resistance can be obtained.

It is a schematic sectional drawing which shows the kneading machine which concerns on the 1st reference example of this invention. It is the A section expanded sectional view of Drawing 1 which shows the principal part of a chamber about the kneading machine concerning the first reference example of the present invention. It is sectional drawing of the principal part of a chamber regarding the kneading machine which concerns on the modification of the 1st reference example of this invention. It is sectional drawing of the principal part of a chamber regarding the kneading machine which concerns on the 2nd reference example of this invention. It is sectional drawing of the principal part of a chamber regarding the kneading machine which concerns on the 3rd reference example of this invention. It is sectional drawing of the principal part of a chamber regarding the kneading machine which concerns on the 1st modification of the 3rd reference example of this invention. It is sectional drawing of the principal part of a chamber regarding the kneading machine which concerns on the 2nd modification of the 3rd reference example of this invention. Relates kneading machine according to the actual施形condition of the present invention, it is a cross-sectional view of a main part of the chamber.

[First Reference Example ]
Hereinafter, the kneader 1 according to the first reference example of the present invention will be described.
As shown in FIG. 1, the kneading machine 1 includes a chamber 2 (a partition member, a base material) in which a space is formed, a floating weight 11 (a partition member, an opening / closing member) provided on the upper portion of the chamber 2, A drop door 12 (partition member, opening / closing member) provided in the lower part of the chamber 2 and a coating layer 3 provided on the inner surface 2c, 11c, 12c of each of the chamber 2, the floating weight 11, and the drop door 12 are provided. ing.
Furthermore, the kneading machine 1 includes a pair of kneading rotors 4 and 5 arranged in the space, and is a so-called hermetically sealed kneading machine.

The chamber 2 is a member in which a space is formed, and this space is a kneading chamber C in which the kneading material W is kneaded. In this reference example , the kneading material W is a rubber raw material containing silica used as a raw material for eco tires.

  The floating weight 11 is supported from above by a hopper 10 into which the kneaded material W is charged so that the upper opening 2a formed in the upper part of the chamber 2 can be opened and closed, and is provided so as to be movable up and down. Then, the floating weight 11 moves downward, so that the kneading material W introduced from the hopper 10 is press-fitted into the kneading chamber C.

  The drop door 12 is provided to be movable up and down so that the lower opening 2b formed in the lower portion of the chamber 2 can be opened and closed. And when this drop door 12 descends, the kneaded material W after kneading is taken out from the kneading chamber C to the outside.

The pair of kneading rotors 4 and 5 have the same or similar configuration.
Each kneading rotor 4 (5) has a shaft portion 4a (5a) having a columnar shape centered on the axis P1 (P2), and a blade portion 4b (5b) formed on each outer peripheral surface of the shaft portion 4a (5a). ). The wing portion 4b (5b) is formed in a spiral shape with respect to the axis P1 (P2), for example. The kneading rotor 4 (5) is provided so as to be rotatable around axes P1 (P2) in opposite directions by a driving source (not shown), and the kneading material W inside the kneading chamber C is kneaded by rotation. .
Here, the extending direction of the axis P1 (P2) of the kneading rotors 4 and 5 is defined as the depth direction.

  Next, the details of the coating layer 3 provided on the inner surface 2c of the chamber 2 will be described with reference to FIG. In addition, although detailed description is abbreviate | omitted, the coating layer 3 is similarly provided also in the inner surface 11c of the floating weight 11, and the inner surface 12c of the drop door 12. FIG.

  The coating layer 3 has a hard coating 20 that covers the inner surface 2c of the chamber 2 and a protective member 21 that covers the edge 20a of the hard coating 20 in the depth direction so as to define the kneading chamber C.

  The hard film 20 is a WC cermet film containing tungsten carbide, and covers the entire area of the inner surface 2c of the chamber excluding the portion where the protective member 21 is installed. Similarly, the inner surface 11c of the floating weight 11 and the inner surface 12c of the drop door 12 are entirely covered except for the installation portion of the protection member 21.

  This WC cermet is a composite material obtained by molding and sintering ceramic particles and metal powder particles, and has a Vickers hardness of about Hv 1000 to 1200. That is, it is a material that can obtain hardness, wear resistance, heat resistance, and oxidation resistance, and is coated on the inner surface 2c using a known thermal spraying method such as high-speed flame spraying. The WC cermet film has a thickness of 0.5 mm or less, and the wear resistance is about 40 times that of chromium plating. In addition, this numerical value of abrasion resistance is a value actually measured by a rubber wheel test.

Here, in this rubber wheel test, the test was performed under the following conditions.
-Wheel dimensions: Diameter 230mm x thickness 13mm
-Number of wheel rotations: 200 revolutions per minute-Wheel pressing load: 14kg
・ Powder: Silica sand No. 6 ・ Powder falling amount: 400 g / min

  The hard coating 20 may be a spray coating of a self-fluxing alloy. This self-fluxing alloy is a nickel-based alloy material or a cobalt-based alloy material containing boron and silicon, and has a Vickers hardness of about Hv 750 to 950. In order to obtain further hardness, it is preferable to use a self-fluxing alloy containing tungsten carbide. The coating is applied to the inner surface 2c using a known spraying method such as high-speed flame spraying. The spray coating of this self-fluxing alloy has a film thickness of about 1 mm, and the wear resistance is about 10 times that of chromium plating. This numerical value of wear resistance is a value actually measured by the rubber wheel test described above.

  Further, the hard coating may be a ceramic coating using a sol-gel method. In the sol-gel method, a ceramic coating is applied by immersing the inner surface 2c in a solution for forming a sol-gel film, or by applying a heat treatment after applying this solution to the inner surface 2c, and the Vickers hardness is about Hv 800 to 1200. ing. Further, the film thickness is 0.5 mm or less, and sufficient abrasion resistance can be obtained.

The protective member 21 is provided on the edge 20a of the hard coating 20 at a position where the chamber 2, the floating weight 11, and the chamber 2 and the drop door 12 are adjacent to each other.
In this reference example , the cross-sectional shape in the plane orthogonal to the axis P2 (P1) is a quadrilateral shape, and is welded or fitted so as to have the same thickness as the hard coating.

  This protective member 21 is made of a Stellite (registered trademark) alloy, which is a cobalt-based alloy containing cobalt, chromium, tungsten, etc., and has a Vickers hardness of about Hv 300 to 460.

  Here, it is known that the higher the hardness, the lower the toughness value of the relationship between hardness and toughness in the material. Such Stellite (registered trademark) alloy is a material for the hard coating 20 described above. Compared to, the toughness value is high.

  The protective member 21 may be made of Trivalloy (registered trademark) alloy, which is a cobalt-based alloy similar to Stellite (registered trademark) alloy. In this case, the Vickers hardness is about Hv 500 to 600, and the hard coating 20 described above is used. Compared to these materials, the toughness value is high.

  Further, the protective member 21 may be made of a Kolmonoy (registered trademark) alloy which is a nickel-based alloy. In this case, the protective member 21 has a Vickers hardness of about Hv 400 to 700, and similarly, compared to the material of the hard coating 20 described above. The toughness value is high.

  The protective member 21 can be made of high-speed steel (high-speed steel), die steel, high-chromium iron, tungsten carbide, or the like, which is a metal material having a lower hardness than the hard coating 20 described above. An alloy material having a hardness of Hv 700 or less is preferable.

  In such a kneader 1, the inner surface 2c of the chamber 2 (the inner surface 11c of the floating weight 11 and the inner surface 12c of the drop door 12 are the same) are covered with the hard film 20, so that it is denser than the film by chrome plating. In addition, it is possible to obtain a highly adherent film, and since the hardness is high, abrasion due to the kneaded material W can be sufficiently suppressed.

  In addition, by using such a hard coating 20, the construction is easier than in the case where overlay welding is performed on the inner surface 2c, and there is a great cost advantage. Moreover, when it is going to obtain the same abrasion resistance as overlay welding, a film thickness can be made very thin. Specifically, the thickness when overlay welding of Stellite (registered trademark) is about 20 times that of the hard coating 20.

  For this reason, even if the hard coating 20 is worn, the inner surface 2c is not formed with such a large uneven shape, and the lowering of the performance of the kneader 1 is unlikely to occur due to the unevenness of the inner surface 2c due to such wear.

  On the other hand, since such a hard coating 20 has high hardness, its toughness value is low. In particular, although the edge 20a is liable to crack or chip, a material with low hardness (high toughness) is used for the edge 20a. Since the protective member 21 is provided, it is possible to suppress such cracks and chips.

According to the kneading machine 1 of this reference example , the inner surface 2c is covered with the hard coating 20, and the edge portion 20a of the hard coating 20 is covered with the protective member 21, thereby reducing the cost and sufficient wear resistance against the kneading material W. Characteristics can be obtained, and the product life can be extended. In particular, when the kneaded material W contains silica as in the present reference example , a large wear resistance effect can be expected.

  As shown in FIG. 1, the protective member 21 is applied to the edge portions 20 a A and 20 a B adjacent to the chamber 2 in the floating weight 11 and the drop door 12. That is, the protective member 21 is preferably applied to all positions that become the edge of the hard coating 20 when the chamber 2, the floating weight 11, and the drop door 12 are provided with the hard coating 20.

  Here, as shown in FIG. 3, the protective member 31 may be larger than the thickness dimension of the hard coating 20. Specifically, a recess 32 is formed at the edge 20a of the hard coating 20 so that the inner surface 2c is recessed on the opposite side of the kneading chamber C compared to the inner surface 2c provided with the hard coating 20. A protective member 31 is provided so as to fit into the recess 32. By doing in this way, since the hard coating 20 and the protective member 31 can make the thickness dimension of the protective member 31 large, making the surface which faces the kneading chamber C side the same, protection with a small toughness value is possible. Even the member 31 can suppress wear of the inner surface 2c.

[Second Reference Example ]
It will now be described kneading machine 40 according to a second exemplary embodiment of the present invention.
In addition, the same code | symbol is attached | subjected to the same component as a 1st reference example, and detailed description is abbreviate | omitted.
In this reference example , the shape of the protection member 41 and the edge 42a of the hard coating 42 is different from that of the first reference example .
As shown in FIG. 4, the hard coating 42 has a first inclined surface 42b at the edge 42a that is inclined from the kneading chamber C side toward the inner surface 2c and directed toward the inner surface 2c side. Here, the first inclined surface 42b is formed by, for example, machining.

  The protection member 41 has a triangular cross section in a plane orthogonal to the axis P2 (P1). Specifically, it has the 2nd inclined surface 41b which inclines toward the inner surface 2c from the kneading chamber C side, and faces the kneading chamber C side. Then, the protective member 41 is fitted on the edge 42a of the hard coating 42 by overlay welding or separately so that the second inclined surface 41b contacts the first inclined surface 42b of the hard coating 42. is set up. Here, when the protection member 41 is a separate body, the second inclined surface 41b is formed by machining or the like, for example.

According to the kneading machine 40 of the present reference example , the contact area between the protective member 41 and the hard coating 42 can be increased by forming the first inclined surface 42b at the edge 42a of the hard coating 42. 41 can be more reliably installed.

[Third reference example ]
It will now be described kneading machine 50 according to a third exemplary embodiment of the present invention.
In addition, the same code | symbol is attached | subjected to the same component as a 1st reference example and a 2nd reference example, and detailed description is abbreviate | omitted.
In this reference example , the shape of the protection member 51, the edge 52a of the hard coating 52, and the installation method of the protection member 51 are different from the first reference example and the second reference example .

  As shown in FIG. 5, the hard coating 52 is inclined at the edge 52a so as to incline from the kneading chamber C side toward the inner surface 2c and to face the inner surface 2c side and to be concave toward the kneading chamber C side. The first curved surface 52b is provided. Here, the first curved surface 52b is formed by machining or the like, for example.

The protective member 51 has a second curved surface 51b that is inclined from the kneading chamber C side toward the inner surface 2c and is curved so as to face the kneading chamber C side and to protrude toward the kneading chamber C side. The protective member 51 is separately installed on the edge 52a of the hard coating 52 so that the second curved surface 51b contacts the first curved surface 52b of the hard coating 52, and the bolt 55 is connected to the kneading chamber C. The protection member 51 is fixed by penetrating the protection member 51 from the side and screwing the bolt 55 into the chamber 2. Here, the second curved surface 51b is formed by machining or the like, for example.
The shape of the edge 52a of the hard film 52, the shape of the protection member 51, instead of that of the present reference example, may be those described for example in the first reference example and the second reference example.

According to the kneading machine 50 of the present reference example , the protective member 51 can be manufactured and installed separately, so that the protective member 51 is not deformed by heat as compared with the case where it is installed by overlay welding. , Can be installed more accurately. Furthermore, it is possible to reduce the number of man-hours for construction compared to overlay welding, and replacement is easy. And since it is also possible to use the material which cannot be installed by overlay welding for the protection member 51, the choice of material spreads.

  Here, as shown in FIG. 6, the protection member 61 is provided so as to contact the edge 62a of the hard coating 62 and the chamber 2 from the circumferential direction in the axis P2 (P1), and the bolt 55 is provided. The protective member 61 may be fixed by penetrating the protective member 61 from the circumferential direction and screwed into the chamber 2. In this modification, the hard coating 62 is formed so that the surface on the inner surface 2c side of the edge portion 62a is formed to the same circumferential position as the inner surface 2c so as to completely cover the inner surface 2c. It is formed so as to protrude from the chamber 2 in the direction. That is, the circumferential end surface of the hard coating 62 that contacts the protective member 61 is a first inclined surface 62b that is inclined in the circumferential direction from the kneading chamber C side toward the inner surface 2c side. Also in the protective member 61, the second inclined surface 61b is formed so as to contact the first inclined surface 62b.

  By using such a protective member 61, it is possible to increase the number of bolts 55 installed by increasing the dimension in the thickness direction without increasing the dimension of the protective member 61 in the circumferential direction. In addition, the wear resistance of the hard coating 62 can be sufficiently obtained, and the protective member 61 can be more reliably prevented from falling off, so that it is possible to further suppress cracking and chipping at the edge 62a of the hard coating 62. Become.

  Moreover, as shown in FIG. 7, the cross section in the surface orthogonal to the axis line P2 (P1) may form the protection member 71 in the shape of a triangle. Specifically, it has the 1st inclined surface 71b which inclines toward the inner surface 2c from the kneading | mixing chamber C side, and faces the inner surface 2c side. Also in the hard coating 72, a second inclined surface 72b that contacts the first inclined surface 71b is formed, and the bolt 55 penetrates the protective member 71 and the hard coating 72 from the kneading chamber C side and enters the chamber 2. The protective member 71 is fixed by being screwed.

  By using such a protective member 71, the protective member 71 can be installed so that the bolt 55 penetrates both the protective member 71 and the hard coating 72. It is also possible to suppress peeling of the film 72.

Furthermore, as shown in FIG. 8, in the first embodiment of the present invention, the protective member 81 is a section on a plane perpendicular to the axis P2 (P1) is that not make stepped shape. Specifically, the protective member 81 has a small thickness dimension on the side covering the hard coating 82. That is, the protective member 81 is formed with a first surface 81a and a second surface 81b that are two surfaces facing the inner surface 2c side, and a step surface 81c that is a surface facing the circumferential direction and disposed between them. The first surface 81a is in contact with the hard coating 82, and the second surface 81b is in contact with the inner surface 2c. Therefore, the edge 82a of the hard coating 82 is formed with surfaces that come into contact with the first surface 81a, the second surface 81b, and the step surface 81c, and the edge 82a is fitted with the protective member 81. It has a staircase shape.

  By using such a protection member 81, the protection member 81 can be installed so that the bolt 55 penetrates both the protection member 81 and the hard coating 82. Since the contact area can be increased, it is possible to further prevent the protective member 81 from falling off and the hard coating 82 from peeling off.

The reference examples and embodiments of the present invention have been described in detail above, but some design changes can be made without departing from the technical idea of the present invention.
For example, the shape of the edge of the protective member and the corresponding hard coating is not limited to that described above, and can be various other shapes.

  The hard coating 20 (42, 52, 62, 72, 82) and the protective member 21 (31, 41, 51, 61, 71, 81) described above are included in the chamber 2, the floating weight 11, and the drop door 12. It is good also as any 1 or more, and it is good also as a member for kneading machines 1 (40, 50).

  Furthermore, the kneading material W is not limited to the one containing silica.

DESCRIPTION OF SYMBOLS 1 ... Kneading machine 2 ... Chamber 2a ... Upper opening 2b ... Lower opening 2c ... Inner surface 3 ... Coating layer 4, 5 ... Kneading machine rotor 4a, 5a ... Shaft part 4b, 5b ... Wing part 10 ... Hopper 11 ... Floating weight 11c ... Inner surface 12 ... Drop door 12c ... Inner surface 20 ... Hard coating 20a, 20aA, 20aB ... Edge 21 ... Protective member C ... Kneading chamber W ... Kneaded material 31 ... Protective member 32 ... Recessed portion 40 ... Kneader 41 ... Protective member 41b ... No. Two inclined surfaces 42 ... hard coating 42a ... edge 42b ... first inclined surface 50 ... kneading machine 51 ... protective member 51b ... second curved surface 52 ... hard coating 52a ... edge 52b ... first curved surface
55 ... bolt 61 ... protective member 61b ... second inclined surface 62 ... hard coating 62a ... edge 62b ... first inclined surface 71 ... protective member 71b ... first inclined surface 72 ... hard coating 72a ... edge 72b ... second inclined Surface 81 ... Protective member 81a ... First surface 81b ... Second surface 81c ... Step surface 82 ... Hard coating 82a ... Edge

Claims (7)

A kneading machine for storing a kneading material in a kneading chamber and kneading with a kneading rotor,
At least one partition member that partitions the kneading chamber and the outside;
Covering the inner surface of the partition member facing the kneading chamber, and a hard coating formed of a material having wear resistance to the kneading material;
A protective member made of a material having a higher toughness than a material for covering the edge of the hard coating on the inner surface of the partition member and forming the hard coating;
With
The partition member is
A chamber that covers the kneading chamber and is formed with an upper opening that opens upward from the kneading chamber and a lower opening that opens downward from the kneading chamber;
A floating weight provided to be movable up and down so as to open and close the upper opening;
A drop door provided to be movable up and down to open and close the lower opening;
Have
The protective member is provided on all edges of the hard coating provided on each of the chamber, the floating weight, and the drop door ,
The protective member includes a first surface and a second surface that are two surfaces facing the inner surface side, and a step surface that is a surface facing the circumferential direction of the kneading rotor disposed therebetween. And
The edge of the hard coating is formed with a surface corresponding to the first surface, the second surface, and the step surface, and the edge is fitted with the protective member. It has a staircase shape,
The kneader in which the first surface is in contact with the hard coating and the second surface is in contact with the inner surface . The kneading machine according to claim 1, wherein the protection member is fixed to the partition member with a bolt. As the kneading material, a material containing silica is kneaded,
The kneader according to claim 1 or 2 , wherein the hard coating is formed of a material having wear resistance with respect to the silica. The kneader according to any one of claims 1 to 3 , wherein the hard coating is a cermet coating containing tungsten carbide. The kneader according to any one of claims 1 to 3 , wherein the hard coating is a sprayed coating of a self-fluxing alloy. The kneading machine according to any one of claims 1 to 3 , wherein the hard film is a ceramic coating by a sol-gel method. The kneading machine according to any one of claims 1 to 6 , wherein the protective member uses an alloy material having a Vickers hardness of Hv 700 or less as the high-toughness material.

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