JPH0569600U - Charge induction charging device for vacuum induction melting furnace - Google Patents

Abstract

(57) [Summary] [Purpose] Even if a relatively large charging material is charged into the charging material charging device of the vacuum induction melting furnace, arching does not occur and charging material from the bucket It is sure to drop and discharge. [Structure] A plurality of pipes 17 are arranged inside the bucket 5 in the longitudinal direction thereof to partition the inside of the bucket 5 in a cross section.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a charging material charging device for initially charging and additionally charging a charging material that is a material to be melted into a melting crucible of a vacuum induction melting furnace installed in a vacuum chamber.

[0002]

[Prior Art]

 Opportunities for charging the material to be melted into the melting crucible of the vacuum induction melting furnace include initial charging at the beginning of melting and additional charging during melting. As a conventional charging method for charging materials in a vacuum induction melting furnace, a bottom lid opening / closing bucket method in which a bottom lid that can be opened and closed is provided on the bottom surface of the bucket is adopted. In this system, as shown in FIG. 1, a vacuum induction melting furnace 2 is installed in a vacuum chamber 1, and a cylindrical charging material charging chamber 4 is installed directly above the vacuum chamber 1 via a gate valve 3. It is provided.

A bottom cover 6 is provided on the bottom surface of the bucket 5 so as to be openable and closable, and the bucket 5 is attached to the inside of a pair of rod-shaped bucket hanging jigs 7. When the upper end of the bucket is suspended, the bucket 5 can also be suspended together. Further, the lower ends of the pair of bucket hanging jigs 7 in which the buckets 5 are arranged are connected to the bottom lid 6 via a link 8, and the pair of bucket hanging jigs is attached to the bucket 5. When 7 is moved down, the bottom lid 6 is opened. In addition, a pair of locking metal fittings 9 are integrally attached to opposite positions on the outer side of the bucket 5, and the locking metal fittings 9 extend from the upper end of the bucket 5 upward by a predetermined length. There is. A locking piece (not shown) is provided on the upper end of the locking metal member 9. A chain drum 12 driven and rotated by a motor 11 is arranged above the charging material charging chamber 4, and the tip of the chain 13 wound around the drum 12 hangs down in the charging material charging chamber 4. A hook 14 for suspending the bucket 5 is attached to the tip of the chain 13.

Then, the charging material (not shown) is charged into the melting crucible 16 forming the vacuum induction melting furnace 2 as follows. First, in the atmosphere, the bucket 5 is taken out from the charging material charging chamber 4, a predetermined amount of charging material is charged into the bucket 5, and then the bucket 5 containing the charging material is charged again. After being put in the chamber 4, the upper end of the bucket hanging jig 7 is hooked on the hook 14 of the chain 13 to suspend the bucket 5 in the charging material charging chamber 4. The rotation of the motor 11 is greatly decelerated, and when the decelerated rotation of the motor 11 rewinds the chain 13 wound around the chain drum 12, the bucket 5 is lowered accordingly. Is becoming

As shown by the chain double-dashed line in FIG. 1, when the bucket 5 is lowered to the set position, a locking piece (not shown) at the tip of the locking metal fitting 9 attached to the bucket 5 and Material insertion The bottom lid opening / closing positioning metal fitting 15 provided at the lower end of the charging chamber 4 is locked, and only the bucket 5 is suspended from this metal fitting 15, and the bucket 5 is in this position. You will not be able to descend beyond. When the chain 13 is further unwound in this state, the bottom lid 6 is opened due to the weight of the charging material accommodated in the bucket 5, and the charging material accommodated in the bucket 5 is vacuum-induced melted. It is dropped into the melting crucible 16 constituting the furnace 2.

The bucket 5 is manufactured so that its inner diameter is slightly smaller than the inner diameter of the melting crucible 16. Further, the shape and size of the block-shaped charging material to be charged into the bucket 5 are not fixed at all, and in reality, charging materials having any shape and size are randomly charged. In such a situation, when the bucket 5 is charged with a small charging material of about 1/5 or less of its inner diameter to be housed, there are few comparative problems. However, if a charging material having a size of about 1/3 to 1/5 of its inner diameter is thrown into the bucket 5 in a random manner, the bottom lid 6 is opened immediately above the melting crucible 16 and is accommodated in the bucket 5. When dropping the charging material of the above size, the charging material accommodated from the lower end to the 1 / 3rd position along the longitudinal direction of the bucket 5 naturally falls by its own weight, Arching (suspending) of the charging material occurs at the 1 / 3rd position from the lower end of the bucket 5, and the charging material stored above this cannot fall naturally. Arching of the charging material is caused by the shape of the massive charging material itself, the roughness of the surface, etc., and is caused by the weight of other charging materials stored above the charging material. This is a phenomenon in which a straining force acting radially outward of the bucket 5 is applied to the charging material, whereby the charging material is pressed against the inner wall surface of the bucket 5 in an arched shape and does not fall.

When this arching occurs, there is no choice but to pull up the bucket 5, remove the charging material in the arching part, and re-charge the charging material, and perform an extra work for charging the charging material into the bucket. In addition, the vacuum induction melting furnace operation is stopped during that time, and the efficiency of the melting operation is significantly reduced.

[0008]

[Problems to be solved by the device]

 Therefore, according to the present invention, even if a relatively large charging material as described above is charged into the bucket that constitutes the charging material charging device of the vacuum induction melting furnace, the above-mentioned arching does not occur and the charging material is supplied from the bucket. It is an issue to ensure that they can be dropped and discharged.

[0009]

[Means for Solving the Problems]

 In order to solve this problem, the means adopted by the present invention is that the size of the charging material is set by arranging the partition member in the longitudinal direction in the bucket that constitutes the charging material charging device of the vacuum induction melting furnace. Corresponding to the above, the inside of the bucket is partitioned in its cross section.

[0010]

[Function of the device]

 By arranging the partition member in the bucket in its longitudinal direction, the inside of this bucket is partitioned in its cross section, so when a relatively large charging material as described above is charged, this charging material will It is accommodated in each of the accommodating portions partitioned by the partition member along the upper and lower direction (longitudinal direction of the bucket) substantially regularly. For this reason, when the bottom lid is opened directly above the melting crucible, the charging material stored in each storage section in the bucket partitioned by the partitioning member does not cause arching at all, and the charging material above it is not charged. The weight of the material is effectively added, and the material is regularly dropped, discharged, and put into the melting crucible directly below.

[0011]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to examples. Since the vacuum induction melting furnace 2 and the charging material charging device for charging the charging material into the vacuum induction melting furnace 2 have already been described in the section “Prior Art”, the same parts as those already described are the same. Only the characteristic parts of the present invention will be described with reference numerals. FIG. 2 is a cross-sectional view of the bucket 5. The bucket 5 is intended to be charged with a lump-shaped charging material having a size of about 1/3 to 1/4 of the inner diameter of the bucket 5. That is, a total of seven pipes 17 having an outer diameter of 1/3 of the inner diameter of the bucket 5 are inserted and arranged inside the bucket 5 so as to form a line in the diameter direction. The pipe 17 is arranged over the entire length of the bucket 5 in the longitudinal direction. The pipe 17 may be fixed to the bucket 5, or the pipes 17 may be fixed to each other by, for example, welding means.

Then, when a charging material having a diameter smaller than the inner diameter of the pipe 17 is charged into the bucket 5 outside the charging material charging chamber 4, the respective pipes 17 arranged in the bucket 5 are almost vertically extended. Housed regularly. When the charging material is in a lump shape, even if the plurality of pipes 17 are arranged in the bucket 5 as described above, the substantial storage volume of the charging material is hardly changed. When the bucket 5 containing this charging material is put in the charging material charging chamber 4 and lowered while being hooked by the hook 14, the bottom lid 6 of the bucket 5 is opened immediately above the melting crucible 16, The block-shaped charging material that is contained in each pipe 17 in a substantially regular manner in the vertical direction is such that the weight of the other charging material that is accommodated in the upper portion effectively acts and arching occurs at all. They are dropped without order, and all at once, and are discharged into the melting crucible 16 directly below. Further, the number of pipes 17 arranged inside the bucket 5 may be appropriately changed depending on the size of the charging material with respect to the inner diameter of the bucket 5.

Further, as shown in FIG. 3, in a bucket 5 ′ having a square cross section, four square pipes 17 ′ having a square cross section are inserted and arranged in the bucket 5 ′, or as shown in FIG. As described above, in a bucket 5 ″ having a rectangular cross section, two rectangular pipes 17 ″ having a rectangular cross section may be inserted and arranged in the bucket 5 ″ to partition the bucket in its cross section.

[0014]

[Effect of the device]

 According to the present invention, a partition member is arranged in a longitudinal direction in a bucket that constitutes a charging material charging device of a vacuum induction melting furnace, and the partition member traverses the inside of the bucket according to the size of the charging material. Since it is partitioned on the surface, by opening the bottom lid provided on the bottom surface of the bucket, the charging material stored in each storage section in the bucket partitioned by the partition member does not arch at all. , All of them can be surely dropped and discharged, and can be put into the melting crucible directly below. Therefore, various problems caused by arching when dropping the charging material can be eliminated, and the operation of the vacuum induction melting furnace can be performed without any hindrance.

[Brief description of drawings]

FIG. 1 is an overall front sectional view of a vacuum induction melting furnace.

FIG. 2 is a cross-sectional view of a bucket 5 having a circular cross section.

FIG. 3 is a cross-sectional view of a bucket 5 ′ having a square cross section.

FIG. 4 is a cross-sectional view of a bucket 5 ″ having a rectangular cross section.

[Explanation of symbols]

 2: Vacuum induction melting furnace 4: Charge material charging chamber 5, 5 ', 5 ": Bucket 6: Bottom cover 7: Bucket hanging jig 16: Melting crucible 17: Pipe (partitioning member) 17', 17": Square Pipe (partitioning member)

Claims (1)

[Scope of utility model registration request] 1. A bucket equipped with an openable / closable bottom lid is attached to the inside of a pair of rod-shaped bucket hanging jigs, and the upper ends of the pair of bucket hanging jigs are hung in a charging material charging chamber. The bucket is lowered in a suspended state, the locking piece provided at the upper end of the bucket and the bottom lid opening / closing positioning metal fitting provided in the charging material charging chamber are locked, and the bucket is locked. The vacuum induction melting of the structure in which the bottom cover is opened and the charging material stored in the bucket is dropped into the melting crucible immediately below by lowering the bucket suspension jig further while only the In the charging material charging device of the furnace, a partition member is arranged in the bucket in the longitudinal direction thereof, and the inside of the bucket is partitioned in its cross-section corresponding to the size of the charging material. vacuum Charger charging device for induction melting furnace.