JP6630204B2 - Continuous construction equipment for refractory materials - Google Patents

Description

  The present invention relates to a molten metal container, a molten metal processing apparatus, and a continuous construction apparatus for a refractory material used for construction or repair of a lining of a high-temperature atmosphere furnace.

  Conventionally, as a continuous construction apparatus for a refractory material, a continuous construction apparatus that continuously mixes a refractory material and water using a rotational force and continuously projects the mixture onto a workpiece is disclosed in, for example, Patent Document 1. Are known.

  FIG. 3 shows a continuous construction apparatus disclosed in Patent Document 1. In the figure, a mixture of a refractory material and water is continuously introduced into the outer cylinder 3A from the introduction section 3B by airflow, and further mixed by the rotational force of the rotating shaft 3C. The mixture is continuously projected from the projection unit 4 to the workpiece.

  However, when the present inventors have used the continuous construction apparatus disclosed in Patent Document 1 for a long period of time, it has become clear that wear occurs particularly on the rotating shaft 3C near the introduction portion 3B. At this time, carbon steel for machine structure (S45C) was used for the rotating shaft 3C. As the wear of the rotating shaft 3C progresses, deformation and the like occur, which hinders the continuous construction of the refractory material, and the continuous construction apparatus cannot have sufficient durability.

JP 2013-137167 A

  The present inventors have studied the cause of wear of the rotating shaft 3C near the introduction part 3B in the continuous construction apparatus disclosed in Patent Document 1 of FIG. 3, and found that the refractory material continuously supplied from the introduction part 3B. It is found that the mixture of water and water collides with the rotating shaft 3C. At the time of collision, the speed of the mixture of the refractory material and water reaches several tens of m / s, and the mixture of the high-speed refractory material and water continuously collides with the rotating shaft 3C. Wear had occurred.

  The present inventors have decided to provide a cemented carbide layer at a position facing the introduction portion of the rotating shaft in order to reduce wear due to the above-mentioned causes. Here, the cemented carbide is an alloy made by compressing a powder of a hard metal carbide or a binder and sintering the obtained compact, and having a Rockwell hardness (HRA) of 80 or more. It is. However, when the cemented carbide layer is provided as a single layer at a position facing the introduction portion of the rotating shaft, it becomes a problem that the cemented carbide layer is cracked, and sufficient durability of the continuous construction apparatus cannot be obtained. .

  Therefore, the problem to be solved by the present invention is to reduce the wear of the rotating shaft, and to prevent the cracking of the rotating shaft, etc., in a continuous construction apparatus for a refractory material that continuously mixes a refractory material and water using a rotating force. And to improve the durability of the continuous construction equipment.

  When the cemented carbide layer is provided as a single layer at the position facing the introduction part of the rotating shaft, the cause of the fracture of the cemented carbide layer is the impact and rotation caused when the mixture of refractory material and water collides with the cemented carbide layer It is thought that the torsional stress generated when the shaft rotates at high speed, the resistance to rotation, the vibration, etc. are combined and the impact force is generated in combination. The present inventors have conceived that cemented carbide is excellent in wear resistance but inferior in fracture toughness.

  Thus, as a structure for preventing cracking of the cemented carbide layer, the inventors of the present invention have devised a multilayer structure in which a super-high alloy layer is disposed outside the rotating shaft and a metal layer is disposed inside the super-high alloy layer. The super-high alloy layer and the metal layer are joined by an organic adhesive or the like. The metal layer is more excellent in fracture toughness than the super-high alloy, and can prevent the rotating shaft from cracking by absorbing and attenuating the shock generated on the rotating shaft. Further, since there are two types of layers having different properties, an effect of attenuating vibration can be obtained.

  That is, the continuous construction apparatus of the refractory material of the present invention is a continuous construction apparatus of a refractory material that continuously supplies a refractory material and water, and projects a mixture of the refractory material and the water onto a workpiece. A container that contains the mixture, an introduction unit that introduces the mixture into an upstream part of the container, a discharge unit that discharges the mixture into a downstream part of the container, and the mixture that is discharged from the discharge unit. A projection unit for projecting onto the body, and a rotation axis extending in a central axis direction of the container from the introduction unit to the discharge unit, the rotation shaft includes a plurality of projecting members on an outer surface, and faces the introduction unit. And a metal layer on the inner side of the cemented carbide layer.

  The metal layer needs to have at least a higher fracture toughness than the ultra-high alloy layer, and must have a strength (tensile strength of 200 MPa or more) to withstand the stress generated on the rotating shaft. As a material to be selected, a steel material is preferable, and rolled steel for general structures (such as SS400), carbon steel for machine structures (such as S45C), cast carbon steel (such as SC410), tool steel (such as SK6), stainless steel (Such as SUS304) is preferred. A non-ferrous metal such as brass can also be selected. For example, a Cu-Mn alloy has a high damping capacity for absorbing vibration, and the strength can be increased by adding a small amount of Al. Aluminum alloys such as duralumin sufficiently satisfy the performance as the metal layer of the present invention, but are inferior to steel materials in terms of ease of procurement and economy. Non-ferrous metals such as pure aluminum, pure magnesium, lead, and tin, which are not generally used for mechanical structures, are not suitable because of their low strength.

  In a preferred embodiment of the present invention, among the plurality of projecting members, the plurality of projecting members disposed on the outer surface of the cemented carbide layer are integrated as the same material as the cemented carbide layer. .

  In a preferred embodiment of the present invention, the metal layer located on the upstream side of the rotation shaft is divided into a plurality of parts, and a cemented carbide sleeve is attached to the divided one metal layer as the cemented carbide layer. Have been.

  In the continuous construction apparatus of the present invention, the rotating shaft has a cemented carbide layer at a position facing the introduction portion that continuously supplies the refractory material and water. Therefore, even if the refractory material supplied from the introduction portion collides with the rotating shaft, the wear of the rotating shaft can be reduced because the cemented carbide layer has better wear resistance than the metal layer. There is a metal layer inside the cemented carbide layer, and the cemented carbide layer and the metal layer are mounted by an adhesive or brazing. The metal layer is more excellent in fracture toughness than the super-high alloy, and can prevent the rotating shaft from cracking by absorbing and attenuating the shock generated on the rotating shaft. Further, since there are two types of layers having different properties, an effect of attenuating vibration can be obtained. For this reason, it is possible to prevent the cemented carbide layer from breaking. As a result, the durability of the continuous construction device can be improved.

  Further, in a preferred embodiment of the present invention, since the protruding members arranged on the outer surface of the cemented carbide layer are integrated by sintering as the same material as the cemented carbide layer, The durability of the arranged protruding members can also be improved. For example, when a protruding member is joined to a rotating shaft with a metal bolt and nut, a mixture of a refractory material and water collides with the metal bolt and nut, and the metal bolt and nut are worn and the protruding shape is formed. The member may come off. On the other hand, if the protruding member arranged on the outer surface of the cemented carbide layer is made of the same material as the cemented carbide layer and integrated by sintering, etc., the protruding member will come off due to wear of the joint. Can be reliably prevented.

  In a preferred embodiment of the present invention, the metal layer located on the upstream side of the rotating shaft is divided into a plurality of pieces, and a cemented carbide sleeve is attached to one of the divided metal layers as a cemented carbide layer. I have. With this configuration, when the cemented carbide sleeve is worn and needs to be replaced, only the cemented carbide sleeve can be removed and replaced. For this reason, the sleeve made of cemented carbide can be easily replaced, and it is not necessary to replace all of the metal layer and the cemented carbide layer.

1 is a mechanism diagram conceptually showing a basic configuration of a continuous construction device according to an embodiment of the present invention. (A) is an external view which shows the specific structure near the introduction part of the continuous construction apparatus of FIG. (B) is sectional drawing which shows the specific structure near the introduction part of the continuous construction apparatus of FIG. It is a mechanism diagram showing the continuous construction device disclosed in Patent Literature 1.

  FIG. 1 is a mechanism diagram conceptually showing a basic configuration of a continuous construction apparatus according to an embodiment of the present invention.

  First, the basic configuration will be described. The continuous construction apparatus of FIG. 1 includes a container (outer cylinder) 10, an introduction section 20, a rotating shaft 30, a protruding member 40 (41), an inner cylinder 50, and a discharge section. 60 and a projection unit 70.

  The container 10 includes a mixture of a refractory material and water continuously introduced from the introduction section 20 (hereinafter, simply referred to as a “mixture”). The inside of the container 10 communicates in the up-down direction, and a rotation shaft 30 is provided at the center of the inside. The container 10 has a cylindrical shape on the upstream side and a diameter gradually increasing in the downstream direction on the downstream side.

  The introduction part 20 is formed in the upstream part of the container 10 and continuously introduces the mixture into the container 10 as described above.

  The rotating shaft 30 is connected to a drive motor (not shown). On the upstream side of the rotating shaft 30, a metal layer and a cemented carbide layer, which will be described later, are provided. An inner cylinder 50 is fixed to the downstream side of the rotating shaft 30, and the inner cylinder 50 is configured to gradually increase in diameter in the downstream direction according to the shape of the downstream side of the container 10. A plurality of projecting members 40 (41) are provided on the outer surface of the rotating shaft 30, and the projecting members 40 are installed on the outer surface of the inner cylinder 50. In addition, there is a space for the mixture to pass between the inner surface of the container 10 and the tip of the protruding member 40.

  In the above configuration, when the rotating shaft 30 is rotated by a driving motor (not shown), the protruding member 40 (41) rotates together with the rotating shaft 30, and when the mixture is introduced from the introduction section 20, the mixture is further mixed ( Kneading). The mixture sequentially moves to the downstream side of the container 10 and is discharged from the discharge unit 60 to the projection unit 70. The mixture discharged from the discharge unit 60 is projected from the projection unit 70 to the workpiece. The configuration of the projection unit 70 is the same as that disclosed in Patent Document 1 described above, and projects the mixture onto the workpiece by centrifugal force due to rotation.

  Incidentally, the composition of the refractory material used in the continuous construction apparatus of the present invention is not particularly limited, for example, alumina, silica, alumina-silica, alumina-spinel, alumina-magnesia, alumina-carbon, Alumina-silicon carbide, alumina-silicon carbide-carbon, magnesia, magnesia-carbon, etc., carbon, silicon carbide, silicon nitride, zirconia, calcia, dolomite, chromium, chromium-magnesia , Magnesia-lime, magnesia-alumina and combinations thereof.

  Further, a binder may be added to the refractory material, and a dispersing agent, a curing modifier, a quick-setting agent and the like may be further added as necessary. As the binder, for example, alumina cement, hydraulic transition alumina, magnesia cement, phosphate, silicate and the like can be used. Examples of the dispersant include alkali metal phosphates such as sodium tripolyphosphate, sodium hexametaphosphate, and sodium polypolyphosphate, polycarboxylates such as sodium polycarboxylate, alkyl sulfonates, aromatic sulfonates, and polyacrylic acids. One or more selected from acid soda, sodium sulfonate, and the like can be used. The curing regulator includes a curing accelerator and a curing retarder.As the curing accelerator, for example, one or more selected from slaked lime, calcium chloride, sodium aluminate, and lithium carbonate can be used. As the retarder, for example, one or more selected from boric acid, citric acid, sodium carbonate, sugar and the like can be used. As the quick setting agent, for example, one or more powders or liquids selected from calcium salts such as slaked lime and calcium chloride, silicates, aluminates, carbonates, sulfates and the like can be used.

  Next, a characteristic configuration of the present invention will be described with reference to FIG. FIG. 2A is an external view showing a specific configuration near the introduction section 20 of the continuous construction apparatus of FIG. 1, and FIG. 2B is a specific view near the introduction section 20 of the continuous construction apparatus of FIG. It is sectional drawing which shows a structure.

  The rotating shaft 30 includes a cemented carbide layer 31 at a position facing the introduction section 20 and a metal layer 32 inside the cemented carbide layer 31. In the present embodiment, the cemented carbide layer 31 is formed of a cemented carbide sleeve, and the cemented carbide sleeve 31 is bonded or brazed so as to cover the outer surface of the metal layer 32 (metallic sleeve 32b). Mounted by For example, in the case of bonding, after the liquid epoxy resin adhesive is applied to the metal layer 32 (the metal sleeve 32b), the cemented carbide sleeve 31 is attached, and the adhesive is cured. When brazing, for example, silver brazing is used.

  The metal layer 32 is formed of a metal sleeve, and the metal sleeve is mounted on the metal rotation shaft 30.

  As shown in FIG. 2, the protruding member 40 is detachably fixed to each of the metal sleeves 32a to 32c by bolts and nuts. The protruding member 41 fixed to the cemented carbide sleeve 31 may be detachably fixed to the cemented carbide sleeve 31 with a bolt and nut, but is preferably formed integrally by sintering. When the protruding member 41 is fixed with a bolt and nut, the bolt and nut may be worn and the protruding member may be lost. When the projecting member 41 is formed integrally with the carbide sleeve 31, the durability of the projecting member 41 can be improved.

  The protruding members 40 and 41 are made of the same cemented carbide as the cemented carbide sleeve 31, and the lower surface thereof is preferably inclined in one direction, and an inclination angle of 10 to 45 degrees is exemplified, and more preferably. Is 25 degrees. Further, it is preferable that the protruding members 40 and 41 are spirally arranged on the outer surface of the rotating shaft 30. Specifically, the protruding member 40 is disposed on the outer surface of the rotating shaft 30 along two spirals, and the protruding member 41 is disposed on the outer surface of the rotating shaft 30 along one spiral. Thereby, with the rotation of the protruding members 40 and 41, the mixture is sequentially conveyed to the downstream, and smooth conveyance to the lower side of the container 10 can be realized.

  As shown in FIG. 2, by having the cemented carbide layer 31 at a position facing the introduction part 20 of the rotating shaft 30, even if the mixture supplied from the introduction part 20 collides with the rotating shaft 30, Wear can be reduced. Further, since the metal layer 32 is attached to the inside of the cemented carbide sleeve 31 by an adhesive or brazing, when the mixture collides with the cemented carbide sleeve 31, the vibration caused by the collision is dispersed in the metal layer 32. Thereby, the stress generated in the cemented carbide sleeve 31 is reduced, and it is possible to prevent the cemented carbide sleeve 31 from being broken by the collision of the mixture.

  Further, in the present embodiment, since the cemented carbide layer 31 is formed of a cemented carbide sleeve, the attachment and replacement thereof are easy. For example, when the cemented carbide sleeve 31 is worn, the cemented carbide sleeve 31 can be easily removed and replaced by heating the mounting portion between the cemented carbide sleeve 31 and the metal layer 32. Mounting can be easily performed by bonding or brazing as described above.

  The metal sleeve is divided into three stages of an upper stage (32a), a middle stage (32b) and a lower stage (32c), and a part of the middle metal sleeve 32b constitutes the metal layer 32 inside the cemented carbide layer 31. Is preferred. With this configuration, when the cemented carbide sleeve 31 is worn and needs to be replaced, only the cemented carbide sleeve 31 can be replaced. Specifically, after the metal sleeve 32a is removed, the cemented carbide sleeve 31 is removed from the metal sleeve 32b and replaced. Then, the new cemented carbide sleeve 31 is mounted on the metal sleeve 32b, and then the metal sleeve 32a is mounted. Thus, when the cemented carbide sleeve 31 is worn and needs to be replaced, the cemented carbide sleeve 31 can be easily replaced. As described above, the cemented carbide sleeve 31 is attached to the metal layer 32 by bonding or brazing. However, as shown in FIG. 32b (metal layer 32). Each of the metal sleeves 32a to 32c is fixed to the rotating shaft 30 by a rotation preventing member 33b, as shown in FIG. Therefore, when the rotating shaft 30 is rotated by a drive motor (not shown), the rotating shaft 30, the metal sleeves 32a to 32c, and the cemented carbide sleeve 31 rotate integrally with the rotating shaft 30.

  Although FIG. 2 shows a structure in which the metal layer 32 is divided as metal sleeves 32a, 32b, and 32c, the metal layer 32 may have an integral structure. When the metal layer 32 has an integral structure, when the cemented carbide sleeve 31 is replaced, it is necessary to replace all the metal layer 32 and the cemented carbide sleeve 31, which leads to an increase in cost. For this reason, it is preferable that the metal layer 32 has a split structure as shown in FIG.

  In this embodiment, as the cemented carbide, an alloy obtained by combining tungsten carbide with cobalt (tungsten carbide-cobalt alloy) is used, but another cemented carbide may be used. For example, a tungsten carbide-titanium carbide-cobalt-based alloy, a tungsten carbide-tantalum carbide-cobalt-based alloy, a tungsten carbide-titanium carbide-tantalum carbide-cobalt-based alloy, or the like may be used. Further, the metal layer (metal sleeve) and the rotating shaft are made of rolled steel material for general structure (SS400), but other carbon steel for machine structure (S45C etc.) may be used.

  In the configuration of the rotating shaft 30 shown in FIG. 2, the protrusion 41 is fixed to the cemented carbide sleeve 31 with bolts and nuts as Example 1, and the one integrated by sintering is referred to as Example 2. Each of the continuous construction apparatuses of Example 1 and Example 2 was provided for the execution. Specifically, the diameter of the rotating shaft 30 is φ130 mm, the cemented carbide components such as the cemented carbide sleeve 31 and the protruding members 40 and 41 are tungsten carbide-cobalt, and the other metal sleeves 32 a to 32 c are The metal component was made of steel for machine structural use (S45C). Note that the protruding members 41 are arranged in a spiral. The conditions for the implementation were as follows: the rotation speed of the rotating shaft 30 was 800 rpm, and the flow rate of the mixture of the refractory material and water into the inlet 20 was 80 kg / min. The composition of the refractory material used was alumina-magnesia.

  In addition, Comparative Example 1 in which the configuration in the vicinity of the introduction portion 20 of the rotating shaft 30 in FIG. 2 was a single layer of steel for machine structural use (S45C) was also provided for implementation. The conditions of the working in Comparative Example 1 are the same as those of the working example. In addition, the durability in the implementation work, the amount of construction of the refractory that was constructed until the thickness of the rotating shaft 30 is reduced to half of the original thickness is defined as the durable tonnage, and the durable tonnage in Comparative Example 1 is set as 100. It is shown as an index. The protruding member 41 is considered to be durable until at least one is missing, and is shown as an index with the durable tonnage in Comparative Example 1 being 100.

  In Example 1 and Example 2 of the present invention, abrasion of the rotating shaft 30 was reduced as compared with Comparative Example 1, and cracking of the rotating shaft 30 was not confirmed. More specifically, in the first embodiment of the present invention, the bolts and nuts for fixing the protruding member 41 are worn out and the protruding member 41 is lost on the way, and the replacement is required. The durability up to a half of the thickness was improved to eight times that of Comparative Example 1 corresponding to the conventional configuration. In Example 2, the durability was improved eight times as compared with Comparative Example 1 corresponding to the conventional configuration. Further, in the first embodiment, the bolt and nut for fixing the protruding member 41 were worn, and the protruding member 41 was lost on the way, requiring replacement. In Example 2, the durability was improved eight times as compared with Comparative Example 1 without the protruding member 41 being cut off in the middle.

DESCRIPTION OF SYMBOLS 10 Container 20 Introducing part 30 Rotation axis 31 Cemented carbide layer (Cemented carbide sleeve)
32 Metal layer 32a-32c Metal sleeve 33a, 33b Detent member 40, 41 Protrusion member 50 Inner cylinder 60 Discharge unit 70 Projection unit

Claims (3)

Continuously supplying a refractory material and water, a continuous construction apparatus of a refractory material to project a mixture of the refractory material and the water to the workpiece,
A container containing the mixture;
An introduction part for introducing the mixture into an upstream part of the container,
A discharge unit for discharging the mixture to a downstream portion of the container,
A projection unit that projects the mixture discharged from the discharge unit to the workpiece,
A rotating shaft extending in a central axis direction of the container from the introduction portion to the discharge portion,
The rotation shaft has a plurality of projecting members on an outer surface thereof, and is provided with a cemented carbide layer at a position facing the introduction portion and a metal layer inside the cemented carbide layer. Construction equipment.   2. The continuous refractory material according to claim 1, wherein, among the plurality of projecting members, the projecting members arranged on the outer surface of the cemented carbide layer are integrated as the same material as the cemented carbide layer. 3. Construction equipment.   The metal layer located on the upstream side of the rotation shaft is divided into a plurality of parts, and a cemented carbide sleeve is mounted as the cemented carbide layer outside one of the divided metal layers. Or the continuous construction device according to any of 2.

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