JP2015030657A - Crucible lifter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crucible lifter that is located compactly at a periphery of a crucible and can securely lift the crucible.SOLUTION: A crucible lifter includes: a plurality of support plates 2 which are entered into a melting furnace from above at at least three places in a peripheral direction through a gap between an outer periphery of a crucible L and an opposed inner periphery of the melting furnace; a connection body 1 which connects respective upper ends of the support plates 2 and has a lifting lock part 13; a lock piece 3 which is made to move toward an outer periphery of a bottom part of the crucible L gradually reduced in diameter downward from a state in which the lock piece is provided at a lower end part of the support plate 2 and housed in the plate; and an operation member 4 which moves the lock piece 3 back and forward from an upper-end direction of the support plate 2.

Description

  The present invention relates to a crucible lifting tool, and more particularly to a crucible lifting tool that can easily and reliably lift a crucible in a narrow space.

  As lifting tools for lifting a crucible, those described in Patent Document 1 and Patent Document 2 have been proposed (referred to as Conventional Technology 1 and Conventional Technology 2, respectively). In prior art 1, the main body of the lifting tool is constituted by an annular elastic plate having a slit in one circumferential direction, and a joint formed near the slit is tightened to close the slit. The inner diameter is reduced, the outer periphery of the crucible is held, and the elastic plate is lifted in this state.

  Moreover, in the prior art 2, the outer periphery of the crucible is provided by providing an annular rim that opens toward the outer periphery so as to surround the outer periphery of the opening edge of the crucible, and expanding the annular tube inserted in the rim with compressed air. The surface is gripped so as to press, and the rim is lifted in this state.

JP-A-9-208020 JP-A-10-259086

  However, in the above conventional crucible lifting tool, since the crucible is lifted mainly by the frictional resistance with the outer peripheral surface of the crucible, it is difficult to lift the crucible, and a relatively large lifting tool installation space is provided on the outer periphery of the crucible. There was a problem that it was necessary to ensure.

  Therefore, the present invention solves such problems, and an object of the present invention is to provide a crucible lifting tool that is positioned compactly around the crucible and can reliably lift the crucible.

  In order to achieve the above object, in the first invention, at least three locations in the circumferential direction pass through the gap (S) between the outer periphery of the crucible (L) and the inner periphery of the melting furnace (M) facing the crucible (L). A plurality of support plates (2) that are allowed to enter the melting furnace from above, a connecting body (1) that connects the upper ends of these support plates (2), and a lower end portion of the support plate (2). From the retracted state accommodated in the plate, the locking piece (3) that is advanced toward the outer periphery of the bottom of the crucible (L) that gradually decreases in diameter from the upper end direction of the support plate (2) And an operating member (4) for advancing and retracting the locking piece (3).

  In the first aspect of the present invention, the support plate with the locking piece in the retracted state is inserted into the melting furnace through the gap between the outer periphery of the crucible and the inner periphery of the melting furnace facing the crucible at at least three locations in the circumferential direction. Let it enter. Thereafter, the crucible can be reliably lifted by moving the locking piece toward the outer periphery of the bottom of the crucible and pulling out the support plate from the melting furnace through the gap. The crucible lifting tool having such a structure can be positioned compactly around the crucible.

  In the second aspect of the invention, the lower end of the locking piece (3) is coupled to the shaft member (32) so that the locking piece (3) can be rotated and advanced from the retracted state.

  According to the second aspect of the present invention, the locking piece can be easily moved back and forth.

  In the third invention, the operating member (4) includes an operating rod (41) along the side surface of the support plate (2), and the lower end of the operating rod (41) is the shaft of the shaft member (32). The shaft member (32) is connected to the shaft member (32) at a position eccentric with respect to the center, and is rotated.

  In the third invention, the rotation operation of the locking piece can be performed compactly and easily within the thickness of the support plate.

  The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiments described later.

  As described above, according to the crucible lifting tool of the present invention, the crucible can be reliably lifted by being positioned compactly around the crucible.

It is a whole perspective view of the crucible lifting tool of the state which lifted the crucible. It is a top view of a crucible lifting tool. It is the front view of a support plate, and is the figure seen from the X arrow direction of FIG. It is sectional drawing which shows the state which lifts the crucible inserted in the melting furnace with a crucible lifting tool.

  The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

  The perspective view of the state which lifted the crucible with the crucible lifting tool in FIG. 1 is shown. In FIG. 1, the crucible lifting tool includes a connecting body 1, and the connecting body 1 has three support arm portions 12 extending horizontally from a central portion 11 in three directions as shown in FIG. 2. A ring-shaped lifting locking portion 13 is provided at the center portion 11 of the coupling body 1 so as to be hung by a lifting hook F (FIG. 1) provided at the lower end of a hoist chain or the like. Yes. Two of the support arms 12 are provided with guide pieces 14 that are bent and extend horizontally outward at intermediate positions, and a guide rod R (FIG. 2) described later is provided at the tip of each guide piece 14. A notch 141 that relatively enters from the outside is formed.

  The upper end of the support plate 2 extending in the vertical direction is fixed to the tip of each support arm 12. The support plate 2 is in the shape of a long plate as shown in FIG. 3, and the upper end portion is fixed to each of the support arm portions 12 with a pair of left and right bolts 21. A rectangular slotted through space 22 is formed at the center of the lower end of the support plate 2, and the locking piece 3 is disposed in the through space 22.

  The locking piece 3 is a rectangular elongated plate body along the cross-sectional shape of the through space 22, and the thickness of the locking piece 3 is substantially the same as that of the support plate 2. Thus, as shown in FIG. 3, in the retracted state in which the locking piece 3 is accommodated in the through space 22 of the support plate 2, the locking piece 3 is within the thickness of the support plate 2.

  In addition, the bolt 31 is screwed into the front-end | tip of the latching piece 3, and it bears the load at the time of contact | abutting to the outer periphery of the crucible L (FIG. 1) mentioned later. A shaft member 32 is provided at the lower end portion of the locking piece 3 so as to penetrate in the width direction, and both ends of the shaft member 32 are rotatably supported on both sides of the lower end of the support plate 2.

  An operation bar 41 that constitutes the operation member 4 is disposed in the vertical direction along one side surface of the support plate 2, and the lower end of the operation bar 41 is connected to the eccentric position of the end surface of the shaft member 32. The upper end of the operation rod 41 is coupled to the lower end of a long plate-like operation piece 42 that can move up and down along the side surface of the upper end portion of the support plate 2. A rod-like handle 43 projects from the operation piece 42 at an intermediate position, and a positioning pin 44 is inserted into the plate surface of the operation piece 42 above it.

  That is, the positioning hole 421 provided on the plate surface of the operation piece 42 is made to coincide with the positioning hole 231 of the bracket 23 erected on the upper end surface of the support plate 2, and the positioning pin 44 is inserted into the positioning holes 421 and 231. By inserting, the operation piece 42 is positioned in the vertical direction, and thereby the locking piece 3 is held in the retracted state shown in FIG. A positioning hole 232 is further provided in the bracket 23 above the positioning hole 231. Note that two of the support plates 2 are provided with stopper members 24 projecting at intermediate positions in the vertical direction of the inner surface (FIG. 1).

  When lifting the crucible L placed in the melting furnace M as shown in FIG. 4 using such a crucible lifting tool, the locking pieces 3 are retracted into the support plates 2 respectively. In the relatively narrow gap S between the outer periphery of the upper end of the crucible L and the opening edge of the melting furnace M, the support plate 2 is entered from above at three locations in the circumferential direction. The approach in this case is along the guide rod R with the side surface of the guide rod R standing at the upper end of the melting furnace M relatively approaching the notch 141 (FIG. 2) at the tip of each guide piece 14. By lowering the entire crucible lifting tool as described above, it is possible to carry out smoothly without shaking.

  After the crucible lifting tool is lowered until the stopper member 24 of each support plate 2 contacts the upper end surface of the crucible L (state of FIG. 4), the positioning pin 44 is extracted from the positioning hole 231 (FIG. 3), and the handle 43 When the operation piece 42 is pulled up by gripping the shaft, the shaft member 32 is rotated via the operation rod 41, and the locking piece 3 is rotated inward about the shaft member 32 as shown by the arrow in FIG. Can be advanced. When the positioning pin 442 is inserted again with the positioning hole 421 of the raised operating piece 42 aligned with the positioning hole 232, the operating piece 42 is positioned in the raised state, and as a result, the locking piece 3 is held in the advanced state. Thus, the crucible L is also in a stable state.

  When the entire crucible lifting tool is raised along the guide rod R in the state where the locking pieces 3 of all the supporting plates 2 are advanced, the locking pieces 3 of the supporting plates 2 are moved to three locations in the circumferential direction in the process. Then, the crucible L is lifted by coming into contact with the outer peripheral surface of the bottom of the crucible L that gradually decreases in diameter (FIG. 1). In this way, the crucible L can be taken out from the melting furnace M. When inserting the crucible L into the melting furnace M, the locking piece 3 is advanced, and the crucible L is lowered into the melting furnace along the guide rod R while supporting the crucible L as described above. It puts on the crucible base M1 (FIG. 4), and then, each locking piece 3 is retracted into the support plate 2, and only the crucible lifting tool is raised and retracted out of the furnace.

  According to such a crucible lifting tool, the crucible L can be reliably lifted by being compactly inserted into a narrow space around the crucible L in the melting furnace M. The guide piece 14 and the guide rod R are not necessarily provided. Further, the advancement / retraction of the locking piece 3 is not necessarily performed by rotating. Furthermore, it is good also as a structure operated instead of operating the operation member 4 provided in each support plate 2 separately. Four or more support plates 2 may be provided.

DESCRIPTION OF SYMBOLS 1 ... Connection body, 13 ... Lifting latching part, 2 ... Support plate, 3 ... Locking piece, 32 ... Shaft member, 4 ... Operation member, 41 ... Operation rod, L ... Crucible, M ... Melting furnace, S ... gap.

Claims (3)

A plurality of support plates that are allowed to enter the melting furnace from above in at least three locations in the circumferential direction through a gap between the outer periphery of the crucible and the inner periphery of the melting furnace that faces the crucible, and upper ends of these supporting plates And a locking piece that is operated to advance toward the outer periphery of the bottom of the crucible that gradually decreases in diameter from the retracted state that is provided in the lower end of the support plate and is accommodated in the plate, A crucible lifting tool comprising: an operating member that advances and retracts the locking piece from the upper end direction of the support plate. The crucible lifting tool according to claim 1, wherein a lower end of the locking piece is coupled to a shaft member so that the locking piece is rotated and advanced from a retracted state. The operation member includes an operation rod along the side surface of the support plate, and the lower end of the operation rod is connected to the shaft member at a position eccentric to the shaft center of the shaft member so as to rotate the shaft member. The crucible lifting tool according to claim 2, which is configured.

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