Fixing and tightening device for connecting steel-making electric arc furnace with graphite electrode

Abstract

The utility model discloses a fixing and tightening device for connecting a steelmaking electric arc furnace with a graphite electrode, and belongs to the technical field of graphite electrode tightening devices. The tightening device comprises a holding rod and a tightening arm connected with the holding rod, a crutch rod head is arranged at the front end of the holding rod, and a first anti-skid part is arranged on the crutch rod head; a second anti-skid part is arranged at one end of the tightening arm, and the other end of the tightening arm is connected with the front end of the holding rod through a connecting piece; and the connecting piece is a pin shaft chain. According to the utility model, the working efficiency of workers is improved, the situation that an integral type tightening device climbs up and down is avoided, the operation is simpler, more convenient and safer, and the unsafe factor that the integral type tightening device and a split type tightening device need to stand on an electrode clamping arm is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of graphite electrode tightening devices, in particular to a graphite electrode fixing and tightening device for a steelmaking electric arc furnace. Background Art

[0002] The steelmaking electric arc furnace mainly utilizes arc heat. In the arc action zone, the temperature is as high as 4000℃. The LF refining furnace is a form of steelmaking electric arc furnace. It is a refining equipment that combines argon blowing, stirring and degassing with arc furnace refining. Arc discharge is carried out through three graphite electrodes to achieve the purpose of heating molten steel.

[0003] During the production process, as the graphite electrodes are used in smelting, they are constantly consumed and need to be extended. Existing extension devices mostly use manual extension solutions or mechanical clamping extension solutions. The general online replacement process is to shut down the high-voltage power supply of the LF refining furnace, manually blow compressed air on the upper thread of the old graphite electrode, hoist the new graphite electrode above the old graphite electrode, put on the graphite electrode fixing device, fix the new graphite electrode and rotate it to achieve the threaded connection between the new and old electrodes. The traditional technical solution of the graphite electrode tightening device has the following technical problems:

[0004] (1) The traditional tightening device is a fixed device. When connecting the graphite electrode, it needs to be inserted from the bottom or top of the new graphite electrode. Although it is possible to put on or insert the upper part of the old graphite electrode when hanging the electrode from the ground (the electrode bolt is connected to the hanging bolt), and then move from the upper part of the old electrode to the lower part of the new electrode after the new electrode is aligned, during the installation process, workers need to climb up and down, which has the hidden dangers of high labor intensity and unsafe construction.

[0005] (2) The improved tightening device adopts a combined device. After the graphite electrode is hoisted and connected, it is opened and clamped from one side. After the graphite electrode is tightened, the tightening device can be removed by loosening the lock on one side, avoiding the danger of climbing up and down. However, when tightening and removing the device, the workers still stand on the electrode clamping arm, and the safety hazard is still not resolved. Utility Model Content

[0006] In view of the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a graphite electrode fixing and tightening device for a steelmaking arc furnace, which overcomes the problem that after the graphite electrode is fixed and tightened, the fixed tightening device and the split tightening device are difficult to disassemble and the unsafe factor of needing to stand on the electrode clamping arm; in addition, there is also the problem of short torque and more manpower is required to drive the graphite electrode to rotate and tighten.

[0007] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0008] A graphite electrode fixing and tightening device for a steelmaking electric arc furnace comprises a grip rod and a tightening arm connected to the grip rod, wherein a turning rod head is provided at the front end of the grip rod, and a first anti-slip portion is provided on the turning rod head; a second anti-slip portion is provided at one end of the tightening arm, and the other end is connected to the front end of the grip rod through a connecting piece; the connecting piece is a pin chain.

[0009] Furthermore, the connecting piece is provided with two pins.

[0010] Furthermore, the first anti-slip portion is a serrated structure.

[0011] Furthermore, the second anti-slip portion is a layered spiral blade structure.

[0012] Furthermore, the tightening arm is in the shape of a semicircular ring.

[0013] Furthermore, the grip rod is retractable.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model improves the working efficiency of workers, avoids the situation that the integral tightening device needs to climb up and down, is easier and safer to operate, and avoids the unsafe factor that the integral and split tightening devices need to stand on the electrode clamping arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a graphite electrode fixing and tightening device for a steelmaking electric arc furnace of the utility model;

[0017] In the figure: 1, grip; 2, turning rod head; 3, first anti-slip part; 4, connecting piece; 5, first pin shaft; 6, second pin shaft; 7, second anti-slip part; 8, tightening arm. DETAILED DESCRIPTION

[0018] In order to more clearly describe the present invention, the present invention is further described below in conjunction with specific embodiments. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] like Figure 1 As shown, the utility model provides a graphite electrode fixing and tightening device for a steelmaking electric arc furnace, comprising a grip rod 1 and a tightening arm 8 connected to the grip rod 1. A turning rod head 2 is provided at the front end of the grip rod 1, and a first anti-slip portion 3 is provided on the turning rod head 2. A second anti-slip portion 7 is provided at one end of the tightening arm 8, and the other end is connected to the front end of the grip rod 1 through a connecting piece 4.

[0020] The connecting member 4 is a pin chain, including a first pin 5 and a second pin 6 . The first pin 5 is connected to the handle 1 , and the second pin 6 is connected to the tightening arm 8 .

[0021] In this embodiment, the first anti-slip portion 3 adopts a sawtooth structure; the second anti-slip portion 7 is a layered spiral blade structure, and the diameter of the second anti-slip portion 7 is larger than the diameter of the tightening arm 8 to ensure that only the second anti-slip portion 7 is in contact with the graphite electrode during operation (this makes the diameter range of the graphite electrode that can be operated by this tightening device larger).

[0022] In actual operation, the first anti-slip part 3 and the second anti-slip part 7 can be replaced by elastic anti-slip pads. The elastic anti-slip pads can be wear-resistant rubber. The wear-resistant rubber can increase the friction between the first anti-slip part 3 and the second anti-slip part 7 and the surface of the graphite electrode, and at the same time avoid pinching or damaging the surface of the graphite electrode.

[0023] Specifically, the tightening arm 8 is in the shape of a semicircular ring.

[0024] The handle 1 is retractable and has a sleeve structure in this embodiment.

[0025] In this embodiment, the grip rod 1 and the tightening arm 8 are preferably made of steel.

[0026] like Figure 1 As shown, similar to the principle of a pipe clamp, after the new graphite electrode is hoisted to the specified position and aligned with the thread of the old graphite electrode, the first anti-slip part 3 and the second anti-slip part 7 are aligned with the graphite electrode with the grip 1, and the grip 1 is rotated. The grip 1 first rotates relative to the tightening arm 8, and the turning rod head 2 pulls the connecting piece 4 to move backward, thereby generating a clamping force between the first anti-slip part 3 and the second anti-slip part 7 (the only parts in contact with the graphite electrode are the first anti-slip part 3 and the second anti-slip part 7).

[0027] The utility model provides a device for fixing and tightening graphite electrodes for steelmaking electric arc furnaces. A person only needs to stand on the inspection platform and turn the grip rod 1 clockwise to tighten the electrode, or turn the grip rod 1 reversely to loosen the electrode, thereby improving work safety and reducing the work intensity of the staff. The grip rod 1 is an extension rod, which increases the torque, greatly saves manpower, and ensures construction safety.

Claims

1. A fixing and tightening device for a graphite electrode of a steelmaking electric arc furnace, comprising a gripping rod (1) and a tightening arm (8) connected to the gripping rod (1), characterized in that: The front end of the grip rod (1) is provided with a crank head (2), and the crank head (2) is provided with a first anti-slip portion (3); One end of the tightening arm (8) is provided with a second anti-slip portion (7), and the other end is connected to the front end of the gripping rod (1) via a connecting piece (4); The connecting member (4) is a pin chain.

2. A graphite electrode fixing and tightening device for steelmaking electric arc furnace according to claim 1, characterized in that: The connecting piece (4) is provided with two pins.

3. The device for fixing and tightening graphite electrodes for steelmaking electric arc furnace according to claim 1, characterized in that: The first anti-slip portion (3) is a sawtooth structure.

4. The device for fixing and tightening graphite electrodes for steelmaking arc furnace according to claim 1, characterized in that: The second anti-slip portion (7) is a layered spiral blade structure.

5. The device for fixing and tightening graphite electrodes for steelmaking arc furnace according to claim 1, characterized in that: The tightening arm (8) is in the shape of a semicircular ring.

6. The device for fixing and tightening graphite electrodes for steelmaking arc furnace according to claim 1, characterized in that: The grip rod (1) is retractable.

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