CA1204578A

CA1204578A - Dummy bar device for continuous casting equipment

Info

Publication number: CA1204578A
Application number: CA000428615A
Authority: CA
Inventors: Teiichi Yamaguchi
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 1982-05-26
Filing date: 1983-05-20
Publication date: 1986-05-20
Also published as: MX157781A; JPS58205661A

Abstract

DUMMY BAR DEVICE FOR CONTINUOUS CASTING EQUIPMENTS

ABSTRACT
In place of the heretofore used long dummy bar for continuous casting equipments extending from a mould up to cast piece drawing rolls, a short dummy bar body having such cross-section configuration and area that can be inserted from the above into a continuous casting mould, is employed in combination with a rotary arm that has one end coupled to an output shaft of a driving device disposed at an appropriate position on a frame of a continuous casting equipment so as to be rotationally driven by the driving device, and a clamping arm pivotably supported from a bracket on the rotary arm so as to be rotated about the pivot point by drive means, whereby the short dummy bar body can be drawn along an arcuated path as clamped between the rotary arm and the clamping arm and can be released from these arms when it has reached drawing rolls.

Description

So The present invention relates to improvements in a dummy bar for continuous casting equipments.
The heretofore known dummy bar has a lenyth extending frorn a mould to cast piece drawing rolls and that having the shape of a chain or links has been used. Normally the overall length of the dummy bar is about lOM, and hence a storage havinq a similar length for the dummy bar is disposed on the outlet side of the drawing device. Therefore, the dummy bar in the prior art had the following shortcomings:
(i) After finishment of casting, the dummy bar can be inserted into the mould again only after the last cast piece has passed through the dummy bar storage.
(ii) The overall length of the cast piece conveying equipment is elongated by the length of the dummy bar storage and hence the cost of the cast piece conveying equipment is raised.
It is therefore one object of the present invention to provide a dummy bar device for continuous casting equipments in which the above~described shortcomings of the dummy bar in the prior art are eliminated, reinsertion of a dummy bar after finishment of casting can be achieved quickly and the overal]
length of the cast piece conveying equipment can be shortened.
According to one feature of the present invention, there is provided a dummy bar device for continuous casting equipments comprising a short dummy bar body having such cross-section configuration and siæe that can be inserted from the above into a mould of the continuous casting equipment, a driving device disposed at an appropriate position on a frame oE the continuous -- 1 .

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casting equipment, a rotary arm having one end coupled to an output shaft of said driving device so as to be rotationally driven by the driving device, and a clamping arm pivotably supported from a bracket on said rotary arm so as to ye rotated about the pivot point by drive means, said dummy bar body beiny adapted to be clamped between said rotary arm and a lower end portion of said clamping arm by energizing said drive means or to be released from the clamped condition by denergizing said drive means.
The above-mentioned and other features and objects of the present invention will become more apparent by reference to the following description of a preferred embodiment of the invention taken in conjunction with the accompanying drawings, wherein:
Fig 1 is a side view partly in cross-section of one preferred embodiment of the present invention showing the state after commencement of casting, Fig, 2 is a cross-section view taken along line A-A in Fig. 1 as viewed in the direction of arrows, Fig. 3 is a side view partly in cross-section of the same preferred embodiment showing the state just prior to commence-ment of casting, and Fig. 4 is a cross-section view taken along line B-~ in Fig. 3 as viewed in the direction of arrows.
Now the present invention will be described in greater detail in connection to the preferred embodiment illustrated in Figs. 1 to 4.
In Fig. 1, Leference numeral 2 designates a mould in a continuous casting equipment, numeral designates cast piece drawing rolls, numeral 8 designates a depression cylinder for applying a depressing force to a drawing roll I, and it is similar to the known continuous casting equipment that molten steel 1 poured into the mou]d 2 from a tandish not shown is drawn by a dummy bar as it is solidified and is led to the drawing rolls I. However, a dummy bar device according to the present invention is constructed as described in the following.
With reference to Fig. 1, reference numeral 3 designates a dummy bar body of a short block shape, and this dummy bar body 3 is made of similar material to the dummy bar head in the prior art and has such cross-section configuration and size that can be inserted from the above in-to the mould 2. Reference numeral 5 designates a rotary arm having one end coupled to a driving device 6 disposed at an appropriate position on a frame F of the continuous casting equipment, numeral 7 designates drive means sueh as, for example, a hydraulic cylinder mounted at an appropriate position in the proximity of the upper end -of the rotary arm 6, and to the tip end of a rod 7a of the hydraulic eylinder 7 is coupled an upper end of a elamping arm 9 via a pin. Referenee numeral 10 designates a bracket provided at an appropriate position on the ro-tary arm 5 as projected therefrom as shown in Fig. 2, the clamping arm 9 is pivotably supported from the bracket 10, and the clamping arm 9 is adapted to be rotated about the pivot point on -the bracket 10 by exten-sion and contraction of the rod 7a caused by actuation of the hydraulic cylinder 7. And upon extension ox the rod 7a, the clamping arm 9 talces the state shown by solid lines in Fig. 2 where the dummy bar body 3 is firmly clamped from its both sides by the lower end portion of the clampiny arm and the lower end portion of the rotary arm 5. While, upon contraction of the rod 7a, the clamping arm 9 takes the state shown by double-dot chain lines in Fig. 2 where the clamping ox the dummy bar body 3 can be released. Thus, the aforementioned dummy bar body 3, the rotary arm 5, the driving device 6, the drive means 7, the clamping arm 9 and the bracket lO jointly form a dummy bar device according to the present invention.
The dummy bar device according to one preferred embodiment of the present invention is constructed as described`above, and upon drawing a solidified cast piece within the mould 2, at first the dummy bar body 3 is inserted into the mould 2 from the above thereof to realize the state shown in Fig. 3, there-after the rotary arm 5 is rotated in the clockwise direction by the driving device 6 until the state shown in Fig. 3 is realized, when the drive means 7 is actuated to Eirmly clamp the dummy bar body 3 between the lower end portion of the clamp-''' ing arm 9 and the lower end portion of the rotary arm 5 (See Fig. 4). Subsequently, after commencement of casting, the driving device 6 is actuated in the opposite direction to that described above to ratate the rotary arm 5 in the anticlockwise direction and thereby draw the cast piece from the mould 2 (See Fig. 1). Meanwhile, when the dummy bar body 3 has reached the drawing rolls 4, the drive means 7 is actuated in the opposite direction to that described above to release the clamping action between the lower end portion of the rotary arm 5 and the lower end portion of the clamping arm 9, the ii7~

subsequent drawing operation is continued by means of the drawing rolls 4, and then the dummy bar body 3 is disconnected from the cast piece and stored at an appropriate place.
The dummy bar device according to the present invention has the above-mentioned structural features and operational functions. Thus, according to the present invention, since provision is made such that a short dummy bar 3 is inserted from the above into the mould before commencement of casting, not only insertion of a dummy bar into a mould after completion of casting can be carried out quickly, but also a dummy bar having a long size is not necessitated, accordingly the overall length of a cast piece conveying equipment can be shortened, hence saving of an installation cost can be realized an the space for installation can be reduced. The present invention can provide the aforementioned practical effects and advantagesO

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Claims

WHAT IS CLAIMED IS:

1. A dummy bar device for continuous casting equipments, comprising a short dummy bar body having such cross-section configuration and size that can be inserted from the above into a mould of the continuous casting equipment, a driving device disposed at an appropriate position on a frame of the continuous casting equipment, a rotary arm having one end coupled to an output shaft of said driving device so as to be rotationally driven by the driving device, and a clamping arm pivotably supported from a bracket on said rotary arm so as to be rotated about the pivot point by drive means, said dummy bar body being adapted to be clamped between said rotary arm and a lower end portion of said clamping arm by energizing said drive means or to be released from the clamped condition by denergizing said drive means.