JPS62160691A - Electrode heating fusion furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to arc furnaces and LF (Ladle Furnace).
More details regarding electrode-heated melting furnaces such as ace) furnaces.

This invention relates to an electrode rod equipped with a grip change mechanism.

[Conventional technology and problems] In electrode-heated melting furnaces such as core-arc furnaces, an electrode clamp is provided at the tip of an electrode support arm that is movable up and down on an electrode post established outside the furnace. At the same time, the electrode rod is inserted into the furnace lid and suspended inside the furnace body.
m:tl! via the electrode clamp. Pass a current through the rod,
An arc is generated between the metal and the molten steel surface to promote melting.

In such an electrode-heated melting furnace, the electrode rod wears out from the bottom end, so the electrode is lowered one by one by lowering the electrode support arm using a lifting device. Conventionally, if you want to change your grip on the electrode after getting close to the object, you would first suspend the electrode using an overhead crane, then loosen the electrode clamp and move to a higher position on the electrode. In such cases, the work of suspending the electrode rods using an overhead crane was a complicated and dangerous work. In order to avoid this complication, it is possible to grasp the electrode rod near the top end from the beginning, but in this case, the length of the electrode rod under the neck becomes longer than originally necessary, which increases power consumption due to increased reactance, and The amount of electrode wear increases due to exothermic oxidation or gas oxidation due to the increased resistance heat generation of the rod itself, and furthermore, the electrode rod comes into contact with the furnace lid, resulting in frequent breakage accidents of the electrode rod, resulting in high operating costs. There was a problem.

- [Object and Structure of the Invention] The object of the present invention is to solve such problems and to easily change the grip of the electrode rod with the electrode clamp. The melting furnace is characterized in that an electrode rod gripping device is provided separately from the electrode clamp at a position directly above a portion of the furnace lid into which the electrode rod is inserted.

[Example] To illustrate and explain an arc furnace as an example, in FIGS. 1 and 2, 1 is an electrode support, 2 is an electrode support arm provided on the electrode support 1 so that it can be raised and lowered, and 3 is the electrode. An elevating device for the support arm 2, 4 an electrode clamp provided at the tip of the electrode support arm 2, 5 a cylinder for driving the same, and an electrode rod 6 held vertically by the electrode clamp 4 and inserted into the furnace cover 7. suspended inside.

Thus, a gripping device 8 for the electrode rod 6 is provided separately from the electrode clamp 4 at a position directly above the portion of the furnace lid 7 through which the electrode rod 6 is inserted.
will be established. In this embodiment, the electrode gripping device 8 has a pedestal 9 on the furnace lid 7, a cylinder IO installed thereon, and one of a pair of gripping pieces 12, 12 attached to the tip of the piston shaft 11. At the same time, the other end is mounted on the pedestal 9 so as to be located on the opposite side of the M-type rod 6 and in contact with the electrode rod 6.

However, in a melting furnace configured in this way, if the electrode rod 6 wears out and the electrode support arm 2 or electrode clamp 4 comes down to the point where it approaches the furnace lid 7, then 1! Polar gripping device! Operate the cylinder 10 of 8 and clamp the electrode rod 6 with its clamping pieces 12 12 6. Then, even if the electrode clamp 4 is loosened, the electrode rod 6 will be clamped by the electrode gripping device 8 and will not fall. . Therefore, the electrode support arm 2 is raised and the higher position of the electrode rod 6 is gripped by the electrode clamp 4. After the electrode clamp 4 has finished gripping the electrode, the electrode gripping device 18 returns the cylinder 10 and continues normal operation. Each time the electrode rod 6 wears out and the electrode support arm 2 and the electrode clamp 4 approach the furnace lid 7, the electrode gripping device 8 grips the electrode rod 6 and adjusts the gripping position of the W1 pole clamp 4. The operation of moving it upward is repeated.

Note that the electrode gripping device is not limited to the above embodiment; for example, as shown in FIGS. 3 and 4, two cylinders 10 and 10 are used in a furnace to grip one electrode rod 6. The electrode rod 6 may be held from both sides by gripping pieces 12.12 provided on the lid 7 and provided at the tips of the respective piston shafts 11.11 of both cylinders 10°lO. Although not shown, the electrode gripping device 8 does not necessarily have to be attached to the furnace M7; if there is a concern about the load-bearing design of the furnace lid 7, an arm is extended from the furnace body or the ground and attached to the tip of the arm. You may also do so.

[Effects of the Invention] By providing the electrode gripping device, it is possible to easily change the grip of the electrode rod using the electrode clamp, and the complexity of suspending the electrode rod with an overhead crane is eliminated.

In addition, it is possible to easily shift the gripping position of the electrode rod by the electrode clamp little by little according to the wear of the electrode rod, which reduces power consumption by reducing the electrode reactance, reduces the amount of electrode wear, and further improves the electrode grip position. It is possible to effectively avoid accidents such as rod breakage, which is extremely useful industrially.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a vertical cross-sectional view schematically showing the main parts, FIG. 2 is a cross-sectional view taken along line X-X in FIG. 1, and FIG. FIG. 4 is a vertical cross-sectional view schematically showing the main parts of the embodiment, and FIG. 4 is a cross-sectional view taken along the line Y--Y in FIG. 2... Electrode support arm, 4... Electrode clamp, 6...
... Electrode rod, 7 ... Furnace lid, 8 ... Electrode gripping device. Patent applicant: Daido Steel Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] The electrode rod is held vertically by an electrode clamp provided at the tip of an electrode support arm that can be raised and lowered, and the electrode rod is inserted into the furnace lid and suspended inside the furnace body, and a current is applied to the electrode rod through the electrode clamp. 1. An electrode heating type melting furnace, which is characterized in that an electrode rod gripping device is provided separately from the electrode clamp at a position directly above a portion of the furnace lid into which the electrode rod is inserted.