JP6380362B2 - Stirring blade fixing structure and stirring blade fixing method - Google Patents

Description

  The present invention relates to a stirring blade fixing structure for fixing a stirring blade provided in a melt stirring tank to a rotating shaft, and a stirring blade fixing method.

  In the non-ferrous metal hydrometallurgical process, nickel matte produced from dry smelting and nickel / cobalt mixed sulfide produced by sulfuric acid leaching from low-grade laterite ore (hereinafter sometimes referred to as MS) are used as raw materials. Most of the metals such as nickel, cobalt, copper, etc. contained in the solution are made into a solution by the chlorine leaching method, and finally electric nickel is produced by the electrowinning method.

  Since the raw material MS in such a production method contains a large amount of sulfur, sulfur is separated and recovered as a residue of the chlorine leaching step in the wet refining method. Sulfur obtained as a residue is temporarily stored in a uniform molten state with little variation in temperature, viscosity, and the like by being stirred after being heated to about 140 ° C. in the melt stirring tank. Then, in order to shape | mold into the tablet shape which is a product shape, it is transferred to the shaping | molding apparatus provided with a melting stirring tank.

  The apparent specific gravity of the residue may fluctuate depending on the production amount and raw material circumstances. When the specific gravity of the residue is small, the residue floats on the liquid surface in the melting and stirring tank and is not easily taken into the molten layer. . For this reason, since it will be in the state in which it is difficult for the sulfur in a melting stirring tank to be in a uniform molten state, or a long time is required until it becomes a uniform molten state, the operation efficiency of a melting stirring tank falls. In such a case, in the test apparatus, by changing the installation height of the stirring blade to a shallow position of the molten layer, the stirring blade is brought closer to the surface of the molten layer, and the residue that floats by making the molten layer surface undulate is removed. It is designed to make it easier to capture.

  In addition, the stirring blade used in the melt stirring tank as the operation equipment is provided with a key groove for fitting the key to the rotating shaft and the boss at the designed mounting position in order to avoid dropping during operation. In general, the stirring blade is fixed in a state where the stirring blade is fixed or cannot be moved to the rotating shaft by a method such as welding. As a technique for making the mounting position variable when attaching and fixing the stirring blade at a predetermined position, for example, in Patent Document 1, a key groove is provided on a rotating shaft in a range in which the stirring blade is fixed, and An agitation blade mounting structure in which a key groove for fitting a taper key to a boss portion so as to face the key groove is provided is disclosed.

Japanese Utility Model Publication No. 05-044227

  However, since molten sulfur is particularly corrosive, a steel material with a lining is used for the rotating shaft, and the key groove as described in Patent Document 1 can be applied to the steel material with the lining. It was difficult. Even if a key groove is provided in the steel material, there is a problem that the lining is damaged by the use of the key groove and the corrosion of the rotating shaft proceeds. For this reason, there are many stirring blades that are welded and fixed to the rotating shaft, and it has been difficult to change the mounting position of the stirring blade used in the melt stirring tank. That is, as described above, since there is a request to change the installation height of the stirring blade, when attaching the stirring blade to the rotating shaft, stirring is performed without providing a keyway on the rotating shaft made of lining steel. It is desired that the wing can be easily and reliably fixed at a desired position on the rotating shaft.

  The present invention has been made in view of the above problems, and a new and improved stirring blade fixing structure capable of easily and surely fixing a stirring blade to a desired position of a rotating shaft, and It aims at providing the stirring blade fixing method.

  One aspect of the present invention is a stirring blade fixing structure in which a stirring blade having a stirring blade portion standing on an outer peripheral surface of a boss portion is attached to a rotary shaft, and at least one protrusion provided on the outer peripheral surface of the boss portion A groove portion that can be fitted to the first portion is formed on the top side, a first shaft fixing portion that fixes the projecting portion and the groove portion while supporting the stirring blade, and an outer diameter of the rotating shaft is substantially A shaft hole portion having the same inner diameter is configured to be engageable with the rotating shaft, and the stirring blade is rotated through the first shaft fixing portion while supporting the first shaft fixing portion from the bottom surface side. A second shaft fixing portion that is fixed to the shaft, and on the inner peripheral surface side of the first shaft fixing portion, an inner wall inclined surface that is formed to reduce the diameter toward the top side is provided, An outer peripheral surface of the second shaft fixing portion is formed so as to be reduced in diameter toward the top side and is in contact with the inner wall inclined surface. An inclined surface and a flange portion extending outward from the lower end side of the outer wall inclined surface are provided, and the bottom surface of the first shaft fixing portion and the flange portion adjust the distance between the bottom surface and the flange portion. It is characterized by being joined via a possible connecting member.

  According to one aspect of the present invention, when the agitating blade is attached to the rotating shaft, the agitating blade can be reliably fixed at a desired position on the rotating shaft without forming a keyway or welding on the rotating shaft. it can.

  At this time, according to an aspect of the present invention, the flange portion of the second shaft fixing portion is provided with a bolt hole, and the bottom surface of the first shaft fixing portion is positioned opposite the bolt hole. The female screw hole provided in the bottom surface of the first shaft fixing portion and the bolt of the flange portion of the second shaft fixing portion via a bolt and nut serving as the connecting member. The first shaft fixing portion and the second shaft fixing portion may be joined while connecting the holes and adjusting the distance between the bottom surface and the flange portion.

  In this case, the second shaft is tightened by tightening the nut in a direction in which the distance further approaches from the state where the inner wall inclined surface of the first shaft fixing portion and the outer wall inclined surface of the second shaft fixing portion are in contact with each other. Since the outer wall inclined surface is pressed against the inner wall inclined surface of the first shaft fixing portion while moving the fixing portion, the shaft hole portion of the second shaft fixing portion is narrowed down, and the second shaft fixing portion is It becomes firmly fixed to the rotating shaft.

  In one aspect of the present invention, the inclination angle of the inner wall inclined surface and the inclination angle of the outer wall inclined surface are substantially the same size, and the length of the outer wall inclined surface is at least the inner wall inclined surface. It is good also as being more than the length of.

  In this case, the second shaft fixing portion is attached by attaching the second shaft fixing portion so that the first shaft fixing portion is supported from the bottom side after the first shaft fixing portion is attached to the rotating shaft. Since the shaft hole portion of the portion is fastened by the first shaft fixing portion, the stirring blade can be firmly fixed to the rotating shaft via the first shaft fixing portion and the second shaft fixing portion.

  In one aspect of the present invention, the boss portion includes a center line of the rotating shaft and is divided into two on a surface passing through the center of gravity of the protrusion, and the protrusion is joined via a connecting member. It is also possible to do.

  In this way, it is not necessary to pass the stirring blade from the end of the rotating shaft, so that the attachment work and the exchange work are facilitated.

  In one aspect of the present invention, at least one of the first shaft fixing portion and the second shaft fixing portion is divided into two on a plane including the center line of the rotating shaft, and the connecting member is interposed therebetween. It is good also as a structure which can be joined.

  In this way, it is not necessary to pass the first shaft fixing portion and the second shaft fixing portion from the end portion of the rotating shaft, so that the attaching operation and the replacing operation are facilitated.

  Another aspect of the present invention is a stirring blade fixing method for attaching a stirring blade having a stirring blade portion standing on an outer peripheral surface of a boss portion to a rotating shaft, and attaching the boss portion to the rotating shaft, A step of temporarily fixing the agitating blade at a predetermined position of the rotating shaft via the boss portion, and a groove portion that can be fitted to at least one protrusion provided on the outer peripheral surface of the boss portion are formed on the top side. A first shaft fixing portion provided on the inner peripheral surface side with an inner wall inclined surface formed so as to be reduced in diameter toward the top portion side is attached to the rotating shaft, and the groove portion is fitted to the projection portion. And a step of fixing the stirring blade while supporting the stirring blade by the first shaft fixing portion, and a shaft hole portion having an inner diameter substantially the same as the outer diameter of the rotating shaft is configured to be fitted to the rotating shaft. In addition, the outer wall is inclined so as to be reduced in diameter toward the top side and is in contact with the inner wall inclined surface. A second shaft fixing portion having a surface provided on the outer peripheral surface side is attached to the rotating shaft, and the inner wall inclined surface and the outer wall inclined surface are fitted to support the first shaft fixing portion from the bottom surface side. The step of fixing the stirring blade to the rotating shaft via the first shaft fixing portion, the flange portion extending outward from the lower end side of the outer wall inclined surface of the second shaft fixing portion, and the Joining via a connecting member capable of adjusting the distance from the bottom surface of the first shaft fixing portion.

  According to another aspect of the present invention, when the agitating blade is attached and fixed to the rotating shaft, the agitating blade can be reliably moved to a desired position on the rotating shaft without forming a keyway or welding on the rotating shaft. It can be firmly fixed.

  At this time, in another aspect of the present invention, the first shaft fixing portion is divided into two on the surface including the center line of the rotating shaft, and can be joined via a connecting member. After joining the flange portion of the second shaft fixing portion and the bottom surface of the first shaft fixing portion via the connecting member, the joining strength of the first shaft fixing portion by the connecting member is increased. It is good also as including the process of making it.

  As described above, by joining the second shaft fixing portion and the first shaft fixing portion and then increasing the joining strength of the connecting member, the inner wall inclined surface of the divided first shaft fixing portion becomes stronger. The shaft hole portion of the second shaft fixing portion where the outer wall inclined surface comes into contact with the inner wall inclined surface of the first shaft fixing portion is further restricted to rotate the stirring blade more firmly. Can be fixed to the shaft.

  As described above, according to the present invention, when the agitating blade is attached to the rotating shaft, the agitating blade is securely fixed at a desired position on the rotating shaft without forming a keyway or welding on the rotating shaft. Can be fixed.

It is a schematic block diagram of the fusion | melting stirring tank to which the stirring blade fixing structure which concerns on one Embodiment of this invention is applied. It is a perspective view which shows the state by which the stirring blade was attached to the rotating shaft by the stirring blade fixing structure which concerns on one Embodiment of this invention. It is a perspective view which shows schematic structure of the stirring blade fixing structure which concerns on one Embodiment of this invention. It is AA sectional drawing of FIG. It is a disassembled perspective view of the stirring blade fixing structure which concerns on one Embodiment of this invention. It is a flowchart which shows the outline of the stirring blade fixing method which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

  First, an outline of a melt stirring tank to which a stirring blade fixing structure according to an embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a melting and stirring tank to which a stirring blade fixing structure according to an embodiment of the present invention is applied.

  As shown in FIG. 1, for example, three stirring blades 10, 20, and 30 are fixedly attached to a rotating shaft 2 in a melt stirring tank 1 to which a stirring blade fixing structure 100 according to an embodiment of the present invention is applied. It has been. The stirring blades 10, 20, and 30 attached to the rotating shaft 2 are rotationally driven by driving a motor 3 that is a driving source of the rotating shaft 2, so that the molten layer (solution) 4 made of molten sulfur in the melting stirring tank is formed. The upper layer, middle layer, and lower layer are each stirred. The stirred molten sulfur flows out into a tank (not shown) due to overflow.

  Among these stirring blades 10, 20, and 30, the stirring blades 20 and 30 that stir the middle layer and the lower layer of the molten layer 4 are fixed to the rotating shaft 2 by welding. On the other hand, in order to stir the upper layer of the molten layer 4, the stirring blade 10 attached near the liquid surface 4a is fixed by the stirring blade fixing structure 100 according to one embodiment of the present invention.

  Among the stirring blades 10, 20, and 30 attached to the rotating shaft 2, the stirring blade 10 is brought close to the liquid surface 4 a of the molten layer 4, and the liquid surface 4 a of the molten layer 4 is made to wave, and the floating residue is In order to make it easy to take in, it is necessary to attach to the shallow position of the molten layer 4. For this reason, in this embodiment, in order to install the stirring blade 10 near the liquid surface 4a, the stirring blade fixing structure 100 that can fix the stirring blade 10 at a desired height position of the rotary shaft 2 is used. The stirring blade 10 is attached to the rotary shaft 3.

  In this embodiment, only the stirring blade 10 that stirs the upper layer of the molten layer 4 is fixed to the rotary shaft 2 by the stirring blade fixing structure 100 according to this embodiment, but the stirring blades 20 and 30 are also of a desired height. In order to securely fix the position, the stirring blade fixing structure 100 according to the present embodiment may be attached to the rotary shaft 2.

  Next, the configuration of the stirring blade fixing structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a perspective view showing a state in which the stirring blade is attached to the rotating shaft in the stirring blade fixing structure according to one embodiment of the present invention, and FIG. 3 is a stirring blade fixing structure according to one embodiment of the present invention. 4 is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 5 is an exploded perspective view of the stirring blade fixing structure according to the embodiment of the present invention.

  The stirring blade fixing structure 100 according to an embodiment of the present invention is used when the stirring blade 10 is attached to and fixed to the rotary shaft 2. As shown in FIG. 2, the stirring blade fixing structure 100 of the present embodiment has a first shaft fixing portion 110 that fixes the stirring blade 10 while supporting it, and supports the first shaft fixing portion 110 from the bottom surface side. And a second shaft fixing portion 120 that fixes the stirring blade 10 to the rotary shaft 2 via the first shaft fixing portion 110. That is, in the present embodiment, by using the first shaft fixing portion 110 and the second shaft fixing portion 120, the stirring blade 10 composed of the stirring blade portion 12 and the boss portion 11 is moved to a desired height of the rotary shaft 2. Fix in position.

  In the stirring blade 10 fixed to the rotary shaft 2 by the stirring blade fixing structure 100 according to one embodiment of the present invention, a pair of stirring blade portions 12 are erected on the outer peripheral surface 11c of the substantially cylindrical boss portion 11. It has a configuration. The stirring blade portion 12 is fixed to the outer peripheral surface 11c of the boss portion 11 by welding or integral molding.

  On the outer peripheral surface 11c of the boss part 11, as shown in FIG. 2, a pair, that is, two protrusions 13 are provided at positions facing each other. Each projecting portion 13 is formed in a flange shape, and has a lower end portion 13b projecting from the bottom surface 11b of the boss portion 11. The lower end portion 13b of the projecting portion 13 is a first shaft fixing described later. It is fitted in a groove 111 formed on the top side of the portion 110. Further, a temporary fixing bolt 16 that is used when the stirring blade 10 is attached to the rotary shaft 2 is provided between the stirring blade portion 12 and the protrusion 13 on the outer peripheral surface 11 c of the boss portion 11. The number of the protrusions 13 is not limited to two, and it is sufficient that at least one protrusion is provided on the outer peripheral surface 11 c of the boss part 11.

  In the present embodiment, as shown in FIG. 3, the boss portion 11 includes a center line of the rotating shaft 2, is divided into two on a surface passing through the center of gravity of the protruding portion 13, and is a connection composed of a bolt 14 and a nut 15. The protrusion 13 is configured to be joined via a member. In other words, the boss portion 11 includes two parts that are symmetrical via a plane that includes the center line of the rotating shaft 2 and passes through the center of gravity of the protruding portion 13.

  A washer 17 is provided below the bolt 14, and a corner 17 on the outside of the washer 17 is bent to form a locking portion 17 a having a function of preventing the bolt 14 from rotating. In addition, the connection member which joins the boss | hub part 11 is not limited to the aspect which fixes each of the projection part 13 with the volt | bolt 14 and the nut 15, For example, one projection part 13 is joined by bolting, and the other projection part It is good also as an aspect which connects 13 with a hinge-shaped jig | tool.

  As described above, the configuration in which the boss portion 11 is divided into two parts eliminates the need to pass the stirring blade 10 from the end of the rotating shaft 2 when the stirring blade 10 is attached to the rotating shaft 2. The agitating blades 20 and 30 (see FIG. 1) are not affected by being fixed by welding or the like, and attachment and replacement operations are facilitated.

  In the first shaft fixing portion 110, a groove portion 111 that can be fitted to the protrusion portion 13 provided on the outer peripheral surface 11c of the boss portion 11 is formed on the top portion 110a side. It has a function of fixing the stirring blade 10 while supporting it. As shown in FIG. 5, two groove portions 111 are provided at positions facing the two protrusion portions 13 provided on the boss portion 11 in the top portion 110 a of the first shaft fixing portion 110, and are respectively fitted to the protrusion portions 13. Since this is possible, the idling of the stirring blade 10 can be prevented beforehand. Depending on the rotation direction of the stirring blade 10, a force that lifts the stirring blade 10 may act. In such a case, a bolt or the like (not shown) that can withstand a differential force from the weight of the stirring blade 10 is used. You may make it connect the stirring blade 10 and the 1st axis | shaft fixing | fixed part 110 with a connection member.

  In the present embodiment, as shown in FIG. 4, a tapered inner wall inclined surface 110 d formed so as to be reduced in diameter toward the top portion 110 a side is provided on the inner peripheral surface side of the first shaft fixing portion 110. It has been. The inner wall inclined surface 110d is in contact with a tapered outer wall inclined surface 120c provided on the outer peripheral surface side of the second shaft fixing portion 120, as will be described later. As shown in FIG. 5, a temporary fixing bolt 115 used when the first shaft fixing portion 110 is attached to the rotating shaft 2 is provided on the outer peripheral surface 110 c of the first shaft fixing portion 110.

  In the present embodiment, as shown in FIG. 3, the first shaft fixing portion 110 is divided into two parts on the plane including the center line of the rotating shaft 2, and a connecting member composed of a bolt 113 and a nut 114 is interposed. Thus, the flange portion 112 provided on the end side of the first shaft fixing portion 110 is joined. In other words, the first shaft fixing portion 110 includes two parts that are symmetrical with respect to a plane that includes the center line of the rotating shaft 2 and passes through the center of gravity of the flange portion 112. Further, the flange portion 112 is configured to protrude in a direction orthogonal to the protruding direction of the protruding portion 13 of the boss portion 11.

  A washer 117 is provided on the lower side of the bolt 113, and an outer corner of the washer 117 is bent to form a locking portion 117 a having a function of preventing the bolt 113 from rotating. The connecting member that joins the first shaft fixing part 110 is not limited to an aspect in which each of the flange parts 112 is fixed by the bolt 113 and the nut 114. For example, one flange part 112 is joined by bolting, It is good also as an aspect which connects the other flange part 112 with a hinge-shaped jig | tool.

  Thus, when the first shaft fixing portion 110 is divided into two parts, the first shaft fixing portion 110 is attached to the end portion of the rotating shaft 2 when the stirring blade 10 is attached to the rotating shaft 2. Therefore, it is not affected by the fact that the other stirring blades 20 and 30 (see FIG. 1) are fixed by welding or the like, and attachment and replacement work are facilitated.

  The second shaft fixing portion 120 is configured such that a shaft hole portion 120d having an inner diameter substantially the same as the outer diameter of the rotating shaft 2 can be fitted to the rotating shaft 2, and the first shaft fixing portion 110 is connected to the bottom surface 110b side. It has a function of fixing the stirring blade 10 to the rotating shaft 2 through the first shaft fixing portion 110 while supporting. In the present embodiment, as shown in FIG. 4, an outer wall inclined surface 120c formed on the outer peripheral surface side of the second shaft fixing portion 120 so as to reduce the diameter toward the top portion 120a, and the outer wall inclined surface. A flange portion 121 extending outward from the lower end side of 120c is provided. The outer wall inclined surface 120c is in contact with a tapered inner wall inclined surface 110d provided on the inner peripheral surface side of the first shaft fixing portion 110.

  In the present embodiment, as shown in FIG. 3, the second shaft fixing portion 120 is in a plane including the center line of the rotating shaft 2, that is, with respect to the protruding direction of the flange portion 112 of the first shaft fixing portion 110. It is divided into two parts on the surface developed in the orthogonal direction, and is joined via a connecting member made of a hinge-shaped jig (not shown). That is, the second shaft fixing portion 120 is configured by two parts that are symmetric via a plane including the center line of the rotating shaft 2. Thus, when the second shaft fixing portion 120 is divided into two parts, the second shaft fixing portion 120 is attached to the end portion of the rotating shaft 2 when the stirring blade 10 is attached to the rotating shaft 2. Therefore, it is not affected by the fact that the other stirring blades 20 and 30 (see FIG. 1) are fixed by welding or the like, and the installation work and the exchange work are facilitated.

  In the present embodiment, the bottom surface 110b of the first shaft fixing portion 110 and the flange portion 121 of the second shaft fixing portion 120 are joined via a connecting member. Specifically, as shown in FIG. 4, a bolt hole 124 is provided in the flange portion 121 of the second shaft fixing portion 120, and the bolt hole 124 is provided in the bottom surface 110 b of the first shaft fixing portion 110. A female screw hole 116 is provided at a position opposite to. Then, the female screw hole 116 provided in the bottom surface 110b of the first shaft fixing portion 110 and the bolt hole 124 of the flange portion 121 of the second shaft fixing portion 120 are connected via the bolt 122 and the nuts 123 and 125 serving as connecting members. It is connected.

  In this embodiment, the bolt 122 screwed into the female screw hole 116 provided in the bottom surface 110 b of the first shaft fixing portion 110 is fixed by the upper nut 125, and the flange portion 121 of the second shaft fixing portion 120. A bolt 122 screwed into a bolt hole 124 provided at the bottom is fixed by a lower nut 123. Then, by moving the lower nut 123 in the vertical direction, the second shaft fixing portion 120 is moved in the vertical direction, and the bottom surface 110b of the first shaft fixing portion 110 and the flange of the second shaft fixing portion 120 are moved. The first shaft fixing portion 110 and the second shaft fixing portion 120 are joined while adjusting the distance from the portion 121.

  In this way, the second shaft fixing portion 120 is moved in a direction in which the distance further approaches from the state in which the inner wall inclined surface 110d of the first shaft fixing portion 110 and the outer wall inclined surface 120c of the second shaft fixing portion 120 are in contact with each other. Since the lower nut 123 is moved along the bolt 122 so as to move, the outer wall inclined surface 120c of the second shaft fixing portion 120 is pressed against the inner wall inclined surface 110d of the first shaft fixing portion 110. become. For this reason, the shaft hole portion 120d of the second shaft fixing portion 120 is narrowed down so that the shaft hole portion 120d grips the rotating shaft 2 in a more pressurized state. Is firmly fixed to the rotary shaft 2.

  That is, in the present embodiment, the first shaft fixing portion 110 and the second shaft fixing portion 120 are connected by the bolt 122 and the nuts 123 and 125 so that the vertical height position can be adjusted. Then, by adjusting the position of the lower nut 123 and sliding the outer wall inclined surface 120c of the second shaft fixing portion 120 in the vertical direction with respect to the inner wall inclined surface 110d of the first shaft fixing portion 110, Since the inner diameter of the shaft hole portion 120d provided at the center of the second shaft fixing portion 120 is varied, the rotating shaft 4 can be firmly gripped and positioned and fixed to the rotating shaft 2.

  By sliding the outer wall inclined surface 120c of the second shaft fixing portion 120 with respect to the inner wall inclined surface 110d of the first shaft fixing portion 110, the shaft hole portion 120d of the second shaft fixing portion 120 is squeezed, and the inner diameter thereof is reduced. Is variable, the inclination angle of the inner wall inclined surface 110d is substantially the same as the inclination angle of the outer wall inclined surface 120c, and the length of the outer wall inclined surface 120c is at least the length of the inner wall inclined surface 110d. The above is preferable. As described above, by providing the inner wall inclined surface 110d of the first shaft fixing portion 110 and the outer wall inclined surface 120c of the second shaft fixing portion 120, the first shaft fixing portion 110 is attached to the rotary shaft 2; When attaching the second shaft fixing portion 120 so as to support the first shaft fixing portion 110 from the bottom surface side, the shaft hole portion 120d of the second shaft fixing portion 120 is tightened by the first shaft fixing portion 110. It is done.

  In particular, the stroke of pushing the second shaft fixing portion 120 into the first shaft fixing portion 110 can be secured by making the length of the outer wall inclined surface 120c larger than the length of the inner wall inclined surface 110d. Therefore, by pushing the second shaft fixing portion 120 toward the inner wall inclined surface 110d of the first shaft fixing portion 110 like a wedge, the first shaft fixing portion 110 and the second shaft fixing portion 120 are moved. Accordingly, the stirring blade 10 can be firmly fixed to the rotating shaft 2. In addition, the inclination angles of the inner wall inclined surface 110d and the outer wall inclined surface 120c referred to here refer to the magnitude of the inclination angle with respect to the horizontal plane (X-axis direction shown in FIG. 4). Further, “substantially the same” regarding the inclination angles of the inner wall inclined surface 110d and the outer wall inclined surface 120c refers to a range of angles having a slight difference of about 0 to 5 degrees from the completely same angle.

  When the stirring blade fixing structure 100 according to an embodiment of the present invention is configured as described above, when the stirring blade 10 is fixed to the rotary shaft 2 by the stirring blade fixing structure 100, the protruding portion 13 of the stirring blade 10 is provided. The stirring blade 10 is supported and fixed to the first shaft fixing portion 110 so as to be fitted into the groove portion 111 of the first shaft fixing portion 110 so that the stirring blade 10 does not idle. Then, a bolt 122 and a nut 123 that serve as a connecting member for the second shaft fixing portion 120 provided with the outer wall inclined surface 120c toward the inner wall inclined surface 110d of the first shaft fixing portion 110 that supports and fixes the stirring blade 10. , 125 is screwed like a wedge to narrow the shaft hole portion 120d of the second shaft fixing portion 120, so that the second shaft fixing portion 120 is firmly fixed to the rotary shaft 2. Become. For this reason, the stirring blade 10 is reliably fixed to the rotating shaft 2 through the first shaft fixing portion 110 supported and fixed to the second shaft fixing portion 120.

  By using such a stirring blade fixing structure 100, when the stirring blade 10 is fixed to the rotary shaft 2, the stirring blade 10 is idled or dropped without performing welding work or a key groove on the rotary shaft. It can be installed while preventing. Further, the mounting position of the stirring blade 10 on the rotating shaft 2 can be changed to a desired height position. That is, the stirring blade 10 can be easily and firmly fixed at a desired height position of the rotating shaft 2.

  Further, in the present embodiment, since the stirring blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120 are configured to be divided into two, the stirring blade 10, the first shaft fixing portion 110 are configured. When the second shaft fixing portion 120 is attached to the rotating shaft 2, it is not necessary to pass the stirring blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120 from the end of the rotating shaft 2. . For this reason, it is not influenced by the other stirring blades 20 and 30 (see FIG. 1) being fixed by welding or the like, and it is necessary to perform a work such as cutting in order to replace them as in the case of being integrally molded. Therefore, attachment work and replacement work become easy, which is advantageous in terms of cost. In the present embodiment, the stirring blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120 can be divided into two parts, but the number of constituent parts is not limited to two. For example, it is good also as a structure divided | segmented into three or more parts.

  Next, an outline of a stirring blade fixing method according to an embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a flowchart showing an outline of a stirring blade fixing method according to an embodiment of the present invention.

  In the stirring blade fixing method according to an embodiment of the present invention, the stirring blade 10 is attached and fixed to a desired height position of the rotary shaft 2 using the stirring blade fixing structure 100. In this embodiment, when attaching the stirring blade 10 in which the stirring blade portion 12 is erected on the outer peripheral surface 11 c of the boss portion 11 to the rotating shaft 2, first, the boss portion 11 is attached to the rotating shaft 2, and the rotating shaft The stirring blade 10 is temporarily fixed to the predetermined position 2 via the boss portion 11 (step S11). At this time, the boss portion 11 of the stirring blade 10 is temporarily fixed to the rotating shaft 2 by using a temporary fixing bolt 16 (see FIG. 2) provided on the boss portion 11. The temporary fixing bolt 16 preferably has a strength that can withstand a force different from the weight of the stirring blade 10.

  If the stirring blade 10 is temporarily fixed to the rotating shaft 2, then the first shaft fixing portion 110 is attached to the rotating shaft 2 (step S12). In the present embodiment, a groove 111 that can be fitted to the protrusion 13 provided on the boss 11 of the stirring blade 10 is formed on the top side of the first shaft fixing portion 110. By fitting the protruding portion 13 of the portion 11, the stirring blade 10 is fixed while being supported by the first shaft fixing portion 110. In addition, the first shaft fixing portion 110 that supports and fixes the stirring blade 10 is in the next process S13 until the first shaft fixing portion 110 is attached from the bottom side to the second shaft fixing portion 120 on the rotating shaft 2. The temporary fixing bolt 115 is screwed and the tip of the temporary fixing bolt 115 is brought into contact with the rotary shaft 2 to be temporarily fixed.

  If the 1st axis | shaft fixing | fixed part 110 is attached to the rotating shaft 2, next, the 2nd axis | shaft fixing | fixed part 120 will be attached to the rotating shaft 2 (process S13). In the present embodiment, a shaft hole portion 120d having an inner diameter substantially the same as the outer diameter of the rotating shaft 2 is configured to be fitted to the rotating shaft 2, and is in contact with the inner wall inclined surface 110d of the first shaft fixing portion 110. A second shaft fixing portion 120 provided with an outer wall inclined surface 120 c in contact with the outer peripheral surface is attached to the rotary shaft 2. Then, while the inner wall inclined surface 110d and the outer wall inclined surface 120c are fitted to support the first shaft fixing portion 110 from the bottom surface side, the stirring blade 10 is attached to the rotary shaft 2 via the first shaft fixing portion 110. Fix it.

  After the second shaft fixing portion 120 is attached to the rotating shaft 2, the flange portion 121 and the first shaft fixing portion that extend outward from the lower end side of the outer wall inclined surface 120c of the second shaft fixing portion 120 are next. It joins via the connection member which can adjust the distance with the bottom face 110b of 110 (process S14). In the present embodiment, the bolt 122 and the nuts 123 and 125 are used as connecting members, and the flange 121 of the second shaft fixing portion 120 and the bottom surface 110b of the first shaft fixing portion 110 are joined while adjusting the distance. .

  Therefore, the outer wall of the second shaft fixing portion 120 is inclined by moving the lower nut 123 upward with respect to the bolt 122 screwed into the female screw hole 116 of the bottom surface 110b of the first shaft fixing portion 110. Since the surface 120c is screwed like a wedge toward the inner wall inclined surface 110d of the first shaft fixing portion 110, the shaft hole portion 120d of the second shaft fixing portion 120 is narrowed down. As a result, the second shaft fixing portion 120 is firmly fixed to the rotating shaft 2.

  Then, the joining strength by the bolt 113 and the nut 114 that are the connecting members of the first shaft fixing portion 110 is increased (step S15). Specifically, after the second shaft fixing portion 120 is bolted in a direction to bring the second shaft fixing portion 120 closer to the first shaft fixing portion 110, the two members are further joined via a connecting member. The bolts for integrating the shaft fixing part 110 are tightened.

  By tightening the bolts in this way, the divided inner wall inclined surface 110d of the first shaft fixing portion 110 is more tightly squeezed. For this reason, the shaft hole portion 120d of the second shaft fixing portion 120 where the outer wall inclined surface 120c abuts on the inner wall inclined surface 110d of the first shaft fixing portion 110 is further narrowed to make the stirring blade 10 stronger. The rotating shaft 2 can be reliably fixed by a desired height position.

  Further, in the present embodiment, as described above, by assembling the stirring blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120 in this order from above the rotating shaft 2, the stirring blade 10 has its own weight. Since it is pressed toward the first shaft fixing portion 110 side, similarly, the protrusion 13 of the stirring blade 10 is also pressed against and fitted into the groove 111. For this reason, the risk that the agitating blade 10 is detached from the rotating shaft 2 and idling is reduced. In addition, as a material of the stirring blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120, a steel material, a lining steel material, a titanium material, a corrosion-resistant austenitic stainless material, or the like can be used. .

  Furthermore, in the present embodiment, as described above, the stirring blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120 are configured to be divided into two, and the stirring blade 10 and the first shaft fixing portion 120 are divided into two. Are attached to the rotary shaft 2 such that the split surfaces of the shaft fixing portion 110 are orthogonal to each other and the split surfaces of the first shaft fixing portion 110 and the second shaft fixing portion 120 are orthogonal to each other. In this way, the agitating blade 10, the first shaft fixing portion 110, and the second shaft fixing portion 120 are attached so that the divided surfaces thereof are orthogonal to each other. 110 and the pressure applied when the second shaft fixing portion 120 is attached to the rotating shaft 2 can be dispersed.

  As described above, in the stirring blade fixing method according to an embodiment of the present invention, when the stirring blade 10 is attached to the rotating shaft 2, the rotating shaft 2 is not welded, and the rotating shaft 2 is not keyed. Since it can be mounted without idling or dropping, and the mounting position of the stirring blade 10 on the rotating shaft 2 can be changed to a desired height position, its industrial value is extremely large.

  Next, the stirring blade fixing structure and the stirring blade fixing method according to one embodiment of the present invention will be described in detail with reference to examples. The present invention is not limited to these examples.

  As test conditions for the stirring blade fixing structure and the stirring blade fixing method according to one embodiment of the present invention, an example in which the stirring blade fixing structure according to one embodiment of the present invention is applied, and the stirring blade fixing structure is not applied. The comparative example was checked based on the fluctuation of the motor load for the presence or absence of problems with the stirring blades after operating for a predetermined period.

  In the examples and comparative examples, the stirring blade, the first shaft fixing portion, and the second shaft fixing portion are each divided into two types, and the rotating shaft has a diameter of 154.4 mm (150.0 mmφ). A steel rod having a thickness of 1 mm or more of surferloy, which is a lining sprayed material for preventing corrosion, was commonly used. On the other hand, in the comparative example, the inner wall surface of the first shaft fixing portion uses a member without a taper, and the fixing to the rotating shaft is also used by bolting for integrating the first shaft fixing portion, The second shaft fixing part was not used.

  In the examples, the stirring device to which the stirring blade fixing structure according to one embodiment of the present invention was applied was used for 18 months in the melt stirring tank. However, problems such as dropping of the stirring blade and idling were particularly observed. There wasn't. On the other hand, in the comparative example, the operation was performed in the melt stirring tank without applying the stirring blade fixing structure according to the embodiment of the present invention. Signs of dropout or slipping were observed. For this reason, when the operation was stopped and the stirring blade was confirmed, the stirring blade was dropped from a predetermined position. From these examples and comparative examples, by fixing the stirring blade to the rotating shaft using the stirring blade fixing structure according to one embodiment of the present invention, problems such as dropping of the stirring blade and idling can be eliminated. I understood.

  Although the embodiments and examples of the present invention have been described in detail as described above, it will be understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. It will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.

  For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. The configuration and operation of the stirring blade and the stirring blade fixing structure are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.

DESCRIPTION OF SYMBOLS 1 Mixed stirring layer, 2 Rotating shaft, 3 Motor, 4 Molten layer, 10 Stirring blade, 11 Boss part, 11c Outer peripheral surface, 12 Stirring blade part, 13 Projection part, 14 Bolt (connection member), 15 Nut (connection member) , 16 Temporary fixing bolt, 17 Washer, 17a Locking portion, 100 Stirring blade fixing structure, 110 First shaft fixing portion, 110a Top portion of first shaft fixing portion, 110b (First shaft fixing portion) ) Bottom surface, 110c outer peripheral surface (of the first shaft fixing portion), 110d inner wall inclined surface, 111 groove portion, 112 flange portion, 113 bolt (connection member), 114 nut (connection member), 115 temporary fixing bolt, 116 female thread Hole, 117 washer, 117a locking portion, 120 second shaft fixing portion, 120a top of second shaft fixing portion, 120b bottom surface of second shaft fixing portion, 120c inclination of outer wall Slope, 120d shaft hole, 121 flange, 122 bolt (connection member), 123 nut (connection member), 124 bolt hole, 125 nut (connection member), S11 step of fixing the stirring blade to the rotating shaft, S12 first The step of attaching the shaft fixing portion to the rotating shaft, the step of attaching the second shaft fixing portion to the rotating shaft, the step of joining the first shaft fixing portion and the second shaft fixing portion, and S15 the first shaft fixing. For increasing the joint strength by the connecting member

Claims (7)

A stirring blade fixing structure that attaches a stirring blade with a stirring blade portion standing on the outer peripheral surface of the boss portion to a rotating shaft,
A groove portion that can be fitted to at least one protrusion portion provided on the outer peripheral surface of the boss portion is formed on the top side, and the protrusion portion and the groove portion are fitted and fixed while supporting the stirring blade. The shaft fixing part of
A shaft hole portion having an inner diameter substantially the same as the outer diameter of the rotating shaft is configured to be fitted to the rotating shaft, and the first shaft fixing portion is supported while supporting the first shaft fixing portion from the bottom surface side. A second shaft fixing portion for fixing the stirring blade to the rotating shaft via,
On the inner peripheral surface side of the first shaft fixing portion, an inner wall inclined surface formed so as to be reduced in diameter toward the top side is provided,
On the outer peripheral surface side of the second shaft fixing portion, an outer wall inclined surface that is formed so as to reduce in diameter toward the top side and abuts against the inner wall inclined surface, and outward from the lower end side of the outer wall inclined surface An extended flange is provided,
A stirring blade fixing structure, wherein the bottom surface of the first shaft fixing portion and the flange portion are joined via a connecting member capable of adjusting a distance between the bottom surface and the flange portion. A bolt hole is provided in the flange portion of the second shaft fixing portion,
On the bottom surface of the first shaft fixing portion, a female screw hole is provided at a position facing the bolt hole,
By connecting the female screw hole provided on the bottom surface of the first shaft fixing portion and the bolt hole of the flange portion of the second shaft fixing portion via bolts and nuts serving as the connecting member, The stirring blade fixing structure according to claim 1, wherein the first shaft fixing portion and the second shaft fixing portion are joined while adjusting a distance between a bottom surface and the flange portion.   The inclination angle of the inner wall inclined surface and the inclination angle of the outer wall inclined surface are substantially the same size, and the length of the outer wall inclined surface is at least longer than the length of the inner wall inclined surface. The stirring blade fixing structure according to claim 1 or 2.   The boss portion includes a center line of the rotating shaft, is divided into two at a surface passing through the center of gravity of the protrusion, and the protrusion is joined via a connecting member. 4. The stirring blade fixing structure according to any one of items 1 to 3.   At least one of the first shaft fixing portion and the second shaft fixing portion is divided into two at a plane including the center line of the rotating shaft, and can be joined via a connecting member. The stirring blade fixing structure according to any one of claims 1 to 4, wherein the stirring blade fixing structure is provided. A stirring blade fixing method for attaching a stirring blade having a stirring blade portion standing on the outer peripheral surface of a boss portion to a rotating shaft,
Attaching the boss part to the rotating shaft, and temporarily fixing the stirring blade to the predetermined position of the rotating shaft via the boss part;
A groove portion that can be fitted to a protrusion provided on at least one of the outer peripheral surfaces of the boss portion is formed on the top side, and an inner wall inclined surface formed so as to reduce the diameter toward the top side is an inner peripheral surface. Attaching the first shaft fixing portion provided on the side to the rotary shaft, fitting the groove portion with the protrusion, and fixing the stirring blade with the first shaft fixing portion;
A shaft hole portion having an inner diameter substantially the same as the outer diameter of the rotating shaft is configured to be fitted to the rotating shaft, and is formed so as to be reduced in diameter toward the top side, and comes into contact with the inclined surface of the inner wall. A second shaft fixing portion having an outer wall inclined surface provided on the outer peripheral surface side is attached to the rotating shaft, and the inner wall inclined surface and the outer wall inclined surface are fitted to each other so that the first shaft fixing portion is moved from the bottom surface side. Fixing the stirring blade to the rotating shaft through the first shaft fixing portion while supporting,
A step of joining via a connecting member capable of adjusting a distance between a flange portion extending outward from a lower end side of the outer wall inclined surface of the second shaft fixing portion and a bottom surface of the first shaft fixing portion; The stirring blade fixing method characterized by including. The first shaft fixing portion is divided into two on the surface including the center line of the rotating shaft, and is configured to be joined via a connecting member,
After joining the flange portion of the second shaft fixing portion and the bottom surface of the first shaft fixing portion via the connecting member, the joining strength of the first shaft fixing portion by the connecting member is increased. The stirring blade fixing method according to claim 6, further comprising a step of causing the stirring blade to be fixed.

Images