Powder filling device

Abstract

The powder filling device compacts the powder and fills the powder into the saggar. The powder filling device is provided with: a pressing plate for compacting the powder in the saggar; and the pressing mechanism is used for pressing the pressing plate towards the powder in the saggar. The pressing plate is provided with: a compaction plate having a compaction surface that is in contact with the powder and compacts the powder; and a plurality of slit plates provided on the lower surface of the compaction plate and extending downward from the compaction surface. The plurality of slit plates are arranged radially when the powder filling device and the saggar are viewed from above in a state in which the saggar is disposed in the powder filling device. The distance between each of the plurality of slit plates and the side wall of the saggar in a state where the saggar is disposed in the powder filling device is substantially the same.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a powder filling device for filling powder into a sagger. Background Art

[0002] For example, when the raw material powder of electronic industrial products is fired, the powder is stored in a sagger for firing. In order to improve the productivity when the powder is fired, when the powder is stored in the sagger, the powder is compacted to improve the filling efficiency of the powder in the sagger. On the other hand, if the powder is compacted and stored in the sagger, the powder is stored in the sagger at a high density. Therefore, after firing, the powder is burned to be solid, and it is sometimes difficult to take the powder out of the sagger. For example, Patent Document 1 discloses a powder filling device for compacting the powder and storing it in the sagger. The powder filling device of Patent Document 1 is equipped with a pressing plate for compacting the powder. The pressing plate is equipped with a plurality of slit plates extending downward from the compacting surface for compacting the powder. By arranging a plurality of slit plates on the pressing plate, a slit-shaped groove is formed in the molded body formed by filling the powder in the sagger. As a result, it is easy to take the powder out of the sagger after firing. The plurality of slit plates have the same shape and are radially arranged when the powder filling device is viewed from above.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-218098 Summary of the invention

[0006] In the powder filling device of patent document 1, a plurality of slit plates are arranged radially from the center of the compacting surface. However, since the plurality of slit plates all have the same shape, when compaction is performed, no slit plates are arranged near the four corners of the square sagger when viewed from above. That is, no slit-shaped grooves are formed near the four corners of the sagger. If no slit-shaped grooves are formed in the molded body formed by filling the powder in the sagger, it is difficult to supply the gas required for the firing reaction to the inside of the powder. In addition, the reaction gas generated by the firing is difficult to be discharged. If the powder filling device of patent document 1 is used, the reaction gas is difficult to be discharged near the four corners of the sagger compared to near the center, and there is a problem of uneven firing state of the powder in the sagger.

[0007] This specification discloses a technology for making the firing state of powder in a sagger uniform.

[0008] In the first scheme of the technology disclosed in this specification, a powder filling device compacts the powder and fills it into a sagger. The powder filling device comprises: a pressing plate, which compacts the powder in the sagger; and a pressing mechanism, which presses the pressing plate toward the powder in the sagger. The pressing plate comprises: a compacting plate, which has a compacting surface that abuts against the powder to compact the powder; and a plurality of slit plates, which are arranged on the lower surface of the compacting plate and extend downward from the compacting surface. When the powder filling device and the sagger are viewed from above in a state where the sagger is set in the powder filling device, the plurality of slit plates are arranged radially. The distances between the plurality of slit plates in a state where the sagger is set in the powder filling device and the side walls of the sagger are approximately the same.

[0009] In the above-mentioned powder filling device, the distance between each slit plate and the side wall of the sagger is substantially the same, so when the powder is compacted, there is no slit plate located away from the side wall of the sagger among the plurality of slit plates. Therefore, there is no portion where the interval between the side wall of the sagger and the slit-shaped groove becomes wide, and the powder contained in the sagger can be uniformly sintered. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view showing a schematic structure of a powder filling device according to Examples 1 and 2.

[0011] Figure 2 It is a top view showing a state where a pressing plate is inserted into a sagger.

[0012] Figure 3 It is a side view showing a state where a pressing plate is inserted into a sagger.

[0013] Figure 4 This is a diagram showing the relationship between the distance between the slit plate and the side surface of the sagger and the uniformity of the powder after firing.

[0014] Figure 5 The graphs show the relationship between the thickness of the slit plate and the uniformity of the powder after firing, and the relationship between the thickness of the slit plate and the pressing force of the pressing device.

[0015] Figure 6 This is a side view showing the distal end of the slit plate of the powder filling device of Example 2.

[0016] Figure 7 1 is a diagram showing the relationship between the angle α of the tapered portion at the distal end of the slit plate and the wear resistance of the slit plate, and the relationship between the angle α and the pressing force of the pressing device.

[0017] Figure 8 This is a side view showing another example of the distal end of the slit plate of the powder filling device of the second embodiment.

[0018] Fig. 9 This is a side view showing the distal end of the slit plate of the powder filling device of Example 3.

[0019] Fig.10 1 is a diagram showing the relationship between the angle β of the tapered portion at the distal end of the slit plate and the wear resistance of the slit plate, and the relationship between the angle β and the pressing force of the pressing device.

[0020] Fig.11 This is a side view showing another example of the distal end of the slit plate of the powder filling device of Example 3. DETAILED DESCRIPTION

[0021] The main features of the embodiments described below are listed in advance. It should be noted that the technical elements described below are independent technical elements, which can exert technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of application.

[0022] The second solution of the technology disclosed in this specification is based on the above-mentioned first solution, and the plurality of slit plates can be arranged so that when the powder filling device and the sagger are viewed from above when the sagger is set in the powder filling device, at least the diagonal line of the sagger is consistent. According to such a configuration, the slit-shaped groove can be formed near the four corners of the sagger.

[0023] The third solution of the technology disclosed in this specification is based on the first or second solution described above, and the distance between each of the plurality of slit plates and the side wall of the sagger when the sagger is set in the powder filling device can be less than 30 mm. According to such a structure, the powder stored in the sagger can be uniformly sintered as a whole.

[0024] The fourth scheme of the technology disclosed in this specification is based on any one of the first to third schemes described above, wherein the thickness of the slit plate can be 0.5 mm to 4 mm. According to such a configuration, the pressing force of the pressing mechanism can be suppressed from increasing, and the powder stored in the sagger can be uniformly sintered.

[0025] A fifth aspect of the technology disclosed in this specification is any one of the first to fourth aspects described above, wherein a tapered portion may be provided at a distal end of the slit plate. With such a configuration, the pressing force of the pressing mechanism can be reduced.

[0026] According to a sixth aspect of the technology disclosed in this specification, in addition to the fifth aspect, the tapered portion may be provided such that only one surface of the slit plate is inclined. The angle of the tapered portion may be greater than 20 degrees and less than 90 degrees.

[0027] The seventh solution of the technology disclosed in this specification is based on the fifth solution described above, and the tapered portion can be set so that only one side of the slit plate is inclined. The angle of the tapered portion can be greater than 30 degrees and less than 85 degrees. According to such a structure, it is possible to maintain sufficient wear resistance at the end of the slit plate, and the pressing force of the pressing mechanism can be further reduced.

[0028] According to an eighth aspect of the technology disclosed in this specification, based on the fifth aspect, the tapered portion may be configured such that two surfaces of the slit plate are inclined and the angle of the tapered portion may be greater than 20 degrees and less than 180 degrees.

[0029] The ninth solution of the technology disclosed in this specification is based on the fifth solution described above, and the tapered portion can be set as follows: the two surfaces of the slit plate are inclined. The angle of the tapered portion can be greater than 30 degrees and less than 170 degrees. According to such a structure, it is possible to maintain sufficient wear resistance at the end of the slit plate, and the pressing force of the pressing mechanism can be further reduced.

[0030] The tenth scheme of the technology disclosed in this specification is based on any one of the first to ninth schemes described above, and the slit plate can be formed of any one or more materials selected from stainless steel, titanium, nickel, polyvinyl chloride, and tungsten carbide. According to such a structure, when the slit plate is inserted into the powder, the slit plate is not easily worn. Therefore, it is possible to reduce the amount of wear powder of the slit plate generated by the wear of the slit plate mixed into the powder. In addition, in the event that the wear powder of the slit plate is mixed into the powder (i.e., the powder before firing), there is also an effect that there is no major problem in the quality of the powder after firing.

[0031] The eleventh scheme of the technology disclosed in this specification is based on any one of the first to tenth schemes described above, and the surface of the slit plate can be polished and ground. According to such a structure, the surface of the slit plate is reduced in unevenness. Therefore, the pressing force of the pressing mechanism can be reduced, and the surface of the slit plate can be less prone to wear.

[0032] A twelfth aspect of the technology disclosed in this specification is any one of the first to tenth aspects described above, wherein the surface of the slit plate may be coated with Teflon (registered trademark).

[0033] Example

[0034] (Example 1)

[0035] The powder filling device 10 of this embodiment is described with reference to the accompanying drawings. The powder filling device 10 is used to compact the powder and fill it in the sagger 2. In this embodiment, the object to be processed stored in the sagger 2 is the powder of the positive electrode material of the lithium ion battery (hereinafter also referred to as "powder"). Figure 1 and Figure 2As shown, in this embodiment, a sagger 2 is used which is roughly rectangular (more specifically, roughly square) when viewed from above. The inner dimension of the side wall of the sagger 2 used in this embodiment has a side length of 306 mm. It should be noted that the powder filling device 10 of this embodiment is roughly rectangular when viewed from above, and can be used to compact powder and fill it in a sagger 2 whose inner dimension of the side wall is 80 to 380 mm.

[0036] like Figure 1 to Figure 3 As shown, the powder filling device 10 includes a pressing plate 20 and a pressing device 12. The pressing plate 20 compacts the powder in the sagger 2. That is, a positioning protrusion not shown is provided on the loading surface for the sagger 2, and the sagger 2 is positioned at a specified position on the loading surface by using the positioning protrusion. The pressing plate 20 is positioned at a predetermined position relative to the loading surface of the sagger 2. Thus, the pressing plate 20 can be inserted into a specified position inside the sagger 2 loaded on the loading surface, and the powder in the sagger 2 can be compacted. The pressing device 12 is arranged above the pressing plate 20, and is configured to move the pressing plate 20 forward and backward relative to the sagger 2 (move in the up and down direction). The pressing plate 20 is lowered toward the inside of the sagger 2, so that the powder in the sagger 2 is pressed. It should be noted that the pressing device 12 can use a pressing device used in a known powder filling device, and therefore, its detailed structure is omitted.

[0037] The pressing plate 20 includes a compacting plate 22 and a plurality of slit plates 24. Figure 2 As shown, the compression plate 22 has a shape slightly smaller than the inner circumference of the side wall of the sagger 2 when viewed from above. That is, in the present embodiment, the compression plate 22 is roughly rectangular and can be accommodated in the sagger 2. The compression plate 22 has a shape such that when the compression plate 20 is accommodated in the sagger 2, the distance L from the side of the sagger 2 is within 30 mm. The compression plate 20 is inserted toward the sagger 2 in such a manner that the center of the compression plate 22 is roughly consistent with the center of the bottom surface of the sagger 2. Therefore, when the compression plate 20 is accommodated in the sagger 2, the distance L between the compression plate 22 and the side of the sagger 2 is within 30 mm. As shown in FIG. Figure 2 and Figure 3 As shown, the compacting plate 22 is in the shape of a flat plate, and the lower surface is parallel to the bottom surface of the sagger 2. A pressing device 12 is arranged on the upper surface of the compacting plate 22. When the sagger 2 contains powder, the compacting plate 22 moves toward the sagger 2 through the pressing device 12, thereby the powder in the sagger 2 is compacted. By compacting the powder in the sagger 2, the filling amount of the powder can be increased, so that a large amount of powder can be efficiently sintered.

[0038] A plurality of slit plates 24 are disposed on the lower surface of the compression plate 22. The slit plates 24 are flat and are disposed perpendicularly to the lower surface of the compression plate 22. That is, the slit plates 24 extend downward from the lower surface (i.e., the compression surface) of the compression plate 22. The dimensions of the plurality of slit plates 24 in the height direction are the same. Figure 2 As shown, the plurality of slit plates 24 are radially arranged when viewed from above. At least four of the plurality of slit plates 24 extend from the center of the compacting plate 22 toward the corner when viewed from above. That is, when the pressing plate 20 is pressed against the sagger 2, the slit plates 24 are arranged at positions that coincide with the diagonal lines connecting the corners of the rectangular bottom surface of the sagger 2. In the present embodiment, eight slit plates 24 are arranged, extending from the center of the compacting plate 22 toward the outer periphery of the compacting plate 22. Four of the eight slit plates 24 extend to the corners of the compacting plate 22, and the remaining four slit plates 24 extend toward the center of the side of the compacting plate 22.

[0039] A plurality of slit plates 24 are provided on the pressing plate 20, so when the powder in the sagger 2 is pressed by the pressing plate 20, a plurality of grooves are formed in the powder in the sagger 2. By compacting the powder and filling it in the sagger 2, the filling amount of the powder filled in the sagger 2 can be increased, but it is difficult to take the powder out of the sagger 2 after firing. By forming a plurality of grooves in the powder during compaction, it is easy to take the powder out of the sagger 2 after firing. In addition, when the powder is compacted and filled in the sagger 2, the gas required for the firing reaction is difficult to be supplied to the inside of the powder. In addition, the reaction gas generated by the powder due to firing is difficult to be discharged to the outside of the sagger 2. In particular, the reaction gas generated by the powder near the bottom surface of the sagger 2 is difficult to be discharged to the outside of the sagger 2. By forming a plurality of grooves in the powder during compaction, the reaction gas generated by the powder near the bottom surface of the sagger 2 is easily discharged, and the powder in the sagger 2 can be fired uniformly as a whole.

[0040] In addition, each slit plate 24 extends from the center of the compacting plate 22 to the side of the compacting plate 22. Therefore, when the powder in the sagger 2 is pressed by the pressing plate 20, the distance L between the end of each slit plate 24 (i.e., the end of the side of the compacting plate 22) and the side of the sagger 2 is within 30 mm. As a result, a groove is also formed in the powder near the side of the sagger 2, and the gas required for the sintering reaction of the sagger 2 is easily supplied to the inside of the powder. In addition, the reaction gas generated by the powder near the side of the sagger 2 is also easily discharged. Therefore, it is possible to suppress the sintering state between the powder near the center of the sagger 2 and the powder near the side of the sagger 2 from becoming uneven.

[0041] It should be noted that, in this embodiment, the slit plates 24 are composed of 8 pieces, but the present invention is not limited to this configuration. The slit plates may include slit plates extending toward the corners of the compacting plate 22, and may be composed of only 4 pieces extending toward the corners of the compacting plate 22, for example. In addition, regarding the slit plates 24, slit plates may be further arranged between the 8 slit plates 24 of this embodiment, and the slit plates may be composed of 16 pieces.

[0042] The slit plate 24 is made of metal, and in this embodiment, it is formed of stainless steel. It should be noted that the slit plate 24 can be formed of metal or resin, for example, it can be formed of titanium, nickel, polyvinyl chloride (PVC) or tungsten carbide. By forming the slit plate 24 with any of the above materials, the slit plate 24 is not easy to wear, and the wear powder generated by the wear of the slit plate 24 when the powder in the sagger 2 is pressed by the pressing plate 20 can be reduced and mixed into the powder. In addition, the surface of the slit plate 24 is subjected to a polishing and grinding process. As a result, the surface of the slit plate 24 is reduced in unevenness, and the surface of the slit plate 24 is not easy to wear. In addition, in the event that the wear powder of the slit plate is mixed into the powder (that is, the powder before firing), there is also an effect that there is no major problem in the quality of the powder after firing. In addition, the pressing force of the pressing device 12 can be reduced. It should be noted that the surface of the slit plate 24 can be coated with a coating material that can reduce the unevenness of the surface of the slit plate 24, for example, it can be coated with Teflon (registered trademark).

[0043] The configuration of the slit plates 24 will be described in further detail. As described above, each slit plate 24 is disposed so that the distance L between the slit plates 24 and the side surface (inner wall) of the slag 2 is within 30 mm when the pressing plate 20 is housed in the slag 2. Figure 4 The relationship between the distance L between the slit plate 24 and the side of the sagger 2 and the uniformity of the powder after firing is shown. The uniformity of the powder after firing is evaluated as follows. After firing, powders located near the center of the sagger 2 and powders located near the side of the sagger 2 are collected from multiple locations, and the amount of lithium contained in each collected powder is measured. When the difference in the amount of lithium contained between the collected powders is below a threshold value, the powder after firing is uniform, and when the difference in the amount of lithium exceeds the threshold value, the powder after firing is non-uniform.

[0044] like Figure 4As shown, when the distance L between the slit plate 24 and the side of the sagger 2 is 1mm, 2mm, 5mm, 10mm, 20mm, 30mm, and 40mm, the uniformity of the powder after firing is confirmed. When the distance L between the slit plate 24 and the side of the sagger 2 is 1mm to 10mm, the powder after firing is uniform. In addition, when the distance L between the slit plate 24 and the side of the sagger 2 is 20mm to 30mm, the powder after firing is not completely uniform, but it is roughly uniform. In addition, when the distance L between the slit plate 24 and the side of the sagger 2 is 40mm, the powder after firing is uneven. It is speculated that the reason why the powder after firing is uneven when the distance L between the slit plate 24 and the side of the sagger 2 is 40mm is that since the groove formed by the slit plate 24 is not formed near the side of the sagger 2, the gas such as oxygen required for firing is not supplied to the entire powder. In addition, it is speculated that the reaction gas generated by the powder near the side of the sagger 2 is difficult to discharge. From the above, it is confirmed that the powder in the sagger 2 can be uniformly sintered by setting the distance L between the slit plate 24 and the side of the sagger 2 to be 30 mm or less, more preferably 10 mm or less. It should be noted that the lower limit of the distance L between the slit plate 24 and the side of the sagger 2 is a value at which the slit plate 24 does not interfere with the sagger 2 when the pressing plate 20 presses the powder in the sagger 2, for example, it can be 1 mm. In addition, if the slit plate 24 does not interfere with the sagger 2 when the pressing plate 20 presses the powder in the sagger 2, the lower limit of the distance L between the slit plate 24 and the side of the sagger 2 can be between values ​​greater than 0 mm and less than 1 mm.

[0045] The slit plate 24 is formed to have a plate thickness of 0.5 mm or more and 4 mm or less. The slit plate 24 is formed to have a constant plate thickness. Figure 5 The relationship between the thickness of the slit plate 24 and the uniformity of the powder after firing and the relationship between the thickness of the slit plate 24 and the pressing force of the pressing device 12 are shown. The pressing force of the pressing device 12 indicates the pressing force required to insert the slit plate 24 into the powder stored in the sagger 2. When a high pressing force is required, Figure 5 In the table, it is marked as inappropriate (×).

[0046] like Figure 5As shown, when the thickness of the slit plate 24 is 0.3 mm, 0.5 mm, 1 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, and 5 mm, the uniformity and pressing force of the powder after firing are respectively confirmed. When the thickness of the slit plate 24 is 0.3 mm, the powder after firing is not uniform. In addition, when the thickness of the slit plate 24 is 0.5 mm, there are cases where the powder after firing is uniform and cases where it is not uniform. In addition, when the thickness of the slit plate 24 is 1 mm to 5 mm, the powder after firing is uniform. It is speculated that the reason why the powder after firing is not uniform when the thickness of the slit plate 24 is 0.3 mm is that since the thickness of the slit plate 24 is thin, the width of the groove formed in the powder is also thinned, and the groove disappears during the period from filling the powder to firing using the powder filling device 10 (moving toward the firing process) and during the firing process, or the width of the groove becomes thinner. The reason why the fired powder is uneven when the slit plate 24 has a thickness of 0.5 mm is also presumed to be the same as above. From the above, it is confirmed that the powder in the sagger 2 can be fired uniformly by setting the slit plate 24 to a thickness of 0.5 mm or more, more preferably 1 mm or more.

[0047] In addition, when the thickness of the slit plate 24 is 0.3 mm to 3 mm, the slit plate 24 can be inserted into the powder with an appropriate pressing force without enlarging the pressing device 12. In addition, when the thickness of the slit plate 24 is 4 mm, if the pressing device 12 is enlarged, the slit plate 24 can be inserted into the powder. In addition, when the thickness of the slit plate 24 is 5 mm, in order to insert the slit plate 24 into the powder, the pressing device 12 needs to be considerably enlarged, and it is difficult to insert the slit plate 24 into the powder. From the above, it is confirmed that the slit plate 24 can be inserted into the powder in the sagger 2 by making the thickness of the slit plate 24 0.5 mm to 4 mm, more preferably 0.5 mm to 3 mm.

[0048] (Example 2)

[0049] In the above-mentioned first embodiment, the slit plate 24 is formed of a constant plate thickness, but the present invention is not limited to this configuration. Figure 6 As shown, the slit plate 124 may be provided with a tapered portion 126 at the end. In this embodiment, the tapered portion 126 with only one side inclined is provided at the slit plate 124. By providing the tapered portion 126 at the end of the slit plate 124, it is easy to insert the slit plate 124 into the powder, and the pressing force of the pressing device 12 can be reduced.

[0050] A tapered portion 126 having an angle α of not less than 20 degrees and less than 90 degrees is provided at the distal end of the slit plate 124 . Figure 7The angle α of the tapered portion 126 of the slit plate 124 shows the relationship with the wear resistance of the slit plate 124 and the relationship with the pressing force of the pressing device 12 .

[0051] like Figure 7 As shown, when the angle α of the tapered portion 126 is 10 degrees, 20 degrees, 25 degrees, 30 degrees, 45 degrees, 60 degrees, 75 degrees, 85 degrees, 88 degrees, and 90 degrees (i.e., without the tapered portion 126), the wear resistance and pressing force of the slit plate 124 are respectively confirmed. When the angle α of the tapered portion 126 is 10 degrees, the thinner area at the end of the slit plate 124 becomes larger, and the end of the slit plate 124 is easily damaged when the pressing plate 20 is inserted into the sagger 2. In addition, when the angle α of the tapered portion 126 is 20 degrees to 25 degrees, when the pressing plate 20 is inserted into the sagger 2, the end of the slit plate 124 is almost not damaged, and has wear resistance. In addition, when the angle α of the tapered portion 126 is 30 degrees to 90 degrees, when the pressing plate 20 is inserted into the sagger 2, the end of the slit plate 124 is not damaged, and has sufficient wear resistance. From the above, it was confirmed that when the angle α of the tapered portion 126 provided at the distal end of the slit plate 124 is set to 20 degrees or more, more preferably 30 degrees or more, the pressing plate 20 has sufficient wear resistance when inserted into the sagger 2 .

[0052] In addition, when the angle α of the tapered portion 126 is 10 to 85 degrees, the slit plate 124 can be inserted into the powder with an appropriate pressing force. In addition, when the angle α of the tapered portion 126 is 88 to 90 degrees, the slit plate 124 can also be inserted into the powder with an appropriate pressing force, but a larger pressing force is required compared to the case where the angle α of the tapered portion 126 is 10 to 85 degrees. The so-called case where the angle α is 90 degrees has the same structure as the slit plate 24 of the above-mentioned embodiment 1 without a tapered portion. That is, when the angle α of the tapered portion 126 is 10 to 85 degrees, the slit plate 124 can be inserted into the powder with a smaller pressing force than the slit plate 24 without a tapered portion. From the above, it is confirmed that by setting the angle α of the tapered portion 126 to 10 to 85 degrees, the slit plate 124 can be inserted into the powder in the sagger 2 with a smaller pressing force.

[0053] It should be noted that, in this embodiment, the tip of the slit plate 124 provided with the tapered portion 126 is pointed, but the present invention is not limited to this configuration. Figure 8 As shown in (a) in FIG. 1 , the slit plate 124a may be provided with a C-chamfered tapered portion 126a with a flat end. Figure 8As shown in (b) in FIG. 1 , the slit plate 124b may be provided with a tapered portion 126b having an R chamfered shape with a curved end. In the case where the slit plates 124a and 124b are provided with a tapered portion 126a having a C chamfered end or a tapered portion 126b having an R chamfered end, the pressing force when the pressing plate 20 is inserted into the sagger 2 can be reduced, as in the case where the slit plate 124 is provided with a tapered portion 126 having a sharp end. In addition, in the case where the slit plates 124a and 124b are provided with a tapered portion 126a having a C chamfered end or a tapered portion 126b having an R chamfered end, when the pressing plate 20 is inserted into the sagger 2, the ends of the slit plates 124a and 124b are not easily damaged, and the wear resistance can be improved compared to the case where the slit plate 124 is provided with a tapered portion 126 having a sharp end.

[0054] (Example 3)

[0055] In the above-mentioned embodiment 2, the slit plate 124 is provided with the tapered portion 126 which is inclined on only one side, but the present invention is not limited to this configuration. Fig. 9 As shown, a conical portion 226 with two inclined surfaces may be provided on the slit plate 224. In this embodiment, a conical portion 226 with an angle β of greater than 20 degrees and less than 180 degrees is provided at the end of the slit plate 124. Fig.10 The angle β of the tapered portion 226 of the slit plate 224 shows the relationship with the wear resistance of the slit plate 224 and the relationship with the pressing force of the pressing device 12 .

[0056] like Fig.10 As shown, when the angle β of the tapered portion 226 is 10 degrees, 20 degrees, 25 degrees, 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees, 170 degrees, 175 degrees, and 180 degrees (i.e., without the tapered portion 126), the wear resistance and pressing force of the slit plate 224 are respectively confirmed. When the angle β of the tapered portion 226 is 10 degrees, the thinner area at the end of the slit plate 224 becomes larger, and the end of the slit plate 224 is easily damaged when the pressing plate 20 is inserted into the sagger 2. In addition, when the angle β of the tapered portion 226 is 20 degrees to 25 degrees, when the pressing plate 20 is inserted into the sagger 2, the end of the slit plate 224 is almost not damaged, and has wear resistance. In addition, when the angle α of the tapered portion 226 is 30 to 180 degrees, the end of the slit plate 224 is not damaged when the pressing plate 20 is inserted into the sagger 2, and the pressing plate 20 has sufficient wear resistance. From the above, it is confirmed that when the end of the slit plate 224 is provided with a tapered portion 226 with two inclined surfaces, similarly, by making the angle β of the tapered portion 226 provided at the end of the slit plate 224 be 20 degrees or more, more preferably 30 degrees or more, the pressing plate 20 has sufficient wear resistance when inserted into the sagger 2.

[0057] In addition, when the angle β of the tapered portion 226 is 10 to 170 degrees, the slit plate 224 can be inserted into the powder with an appropriate pressing force. In addition, when the angle β of the tapered portion 226 is 175 to 180 degrees, the slit plate 224 can also be inserted into the powder with an appropriate pressing force, but a larger pressing force is required compared to the case where the angle β of the tapered portion 226 is 10 to 170 degrees. The so-called case where the angle β is 180 degrees has the same structure as the slit plate 24 of the above-mentioned embodiment 1 without a tapered portion. That is, when the angle β of the tapered portion 226 is 10 to 170 degrees, the slit plate 224 can be inserted into the powder with a smaller pressing force than the slit plate 24 without a tapered portion. From the above, it is confirmed that by setting the angle β of the tapered portion 226 to 10 to 170 degrees, the slit plate 224 can be inserted into the powder in the sagger 2 with a smaller pressing force.

[0058] It should be noted that, in this embodiment, the slit plate 226 is provided with a tapered portion 226 with both sides inclined at the same angle, but the present invention is not limited to this configuration. The slit plate 226 may be provided with a tapered portion with an angle β. Therefore, the total of the inclination angle of one side and the inclination angle of the other side may be the angle β, and the slit plate may be provided with a tapered portion with a different inclination angle of one side and the other side.

[0059] In addition, in this embodiment, similarly, the end of the slit plate 124 provided with the tapered portion 226 may not be pointed. Fig.11 As shown in (a) in FIG. 1 , the slit plate 224a may be provided with a C-chamfered tapered portion 226a with a flat end. Fig.11 As shown in (b), the slit plate 224b may be provided with a tapered portion 226b having an R chamfered shape with a curved end. By providing the slit plates 124a and 124b with a C chamfered end or a R chamfered end, the pressing force when the pressing plate 20 is inserted into the sagger 2 can be reduced, and the wear resistance can be improved.

[0060] The specific examples of the technology disclosed in this specification are described in detail above, however, these specific examples are only examples and do not limit the claims. The technology described in the claims includes examples obtained by various deformations and changes of the specific examples illustrated above. In addition, the technical elements described in this specification or the drawings exert technical usefulness alone or in various combinations, and are not limited to the combinations recorded in the claims at the time of application. In addition, the technology illustrated in this specification or the drawings achieves multiple purposes at the same time, and the solution to achieve one of the purposes itself has technical usefulness.

Claims

1. A powder filling device, which compacts the powder and fills it into a sagger, The powder filling device is characterized by comprising: A pressing plate, which compacts the powder in the sagger; and A pressing mechanism presses the pressing plate toward the powder in the sagger, The pressing plate has: a compacting plate having a compacting surface that abuts against the powder to compact the powder; and A plurality of slit plates, which are arranged on the lower surface of the compression plate and extend downward from the compression surface, When the powder filling device and the sagger are viewed from above in a state where the sagger is set in the powder filling device, the plurality of slit plates are arranged radially. When the sagger is installed in the powder filling device, the distances between each of the plurality of slit plates and the side wall of the sagger are substantially the same.

2. The powder filling device according to claim 1, characterized in that: The plurality of slit plates are arranged so as to coincide with at least a diagonal line of the sagger when the powder filling device and the sagger are viewed from above in a state in which the sagger is installed in the powder filling device.

3. The powder filling device according to claim 1, characterized in that: The distance between each of the plurality of slit plates and a side wall of the sagger when the sagger is installed in the powder filling device is 30 mm or less.

4. The powder filling device according to claim 1, characterized in that: The slit plate has a thickness of 0.5 mm or more and 4 mm or less.

5. The powder filling device according to claim 1, characterized in that: A tapered portion is provided at a distal end of the slit plate.

6. The powder filling device according to claim 5, characterized in that: The tapered portion is configured such that only one side of the slit plate is inclined. The angle of the tapered portion is greater than 20 degrees and less than 90 degrees.

7. The powder filling device according to claim 5, characterized in that: The tapered portion is configured such that only one side of the slit plate is inclined. The angle of the tapered portion is greater than or equal to 30 degrees and less than or equal to 85 degrees.

8. The powder filling device according to claim 5, characterized in that: The tapered portion is configured such that the two surfaces of the slit plate are inclined. The angle of the tapered portion is greater than 20 degrees and less than 180 degrees.

9. The powder filling device according to claim 5, characterized in that: The tapered portion is configured such that the two surfaces of the slit plate are inclined. The angle of the tapered portion is greater than or equal to 30 degrees and less than or equal to 170 degrees.

10. The powder filling device according to claim 1, characterized in that: The slit plate is formed of any one or more materials selected from the group consisting of stainless steel, titanium, nickel, polyvinyl chloride, and tungsten carbide.

11. The powder filling device according to any one of claims 1 to 10, characterized in that: The surface of the slit plate is subjected to a polishing and grinding process.

12. The powder filling device according to any one of claims 1 to 10, characterized in that: The surface of the slit plate is coated with Teflon (registered trademark).

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