CN201708972U

CN201708972U - Tripping preventive graphite electrode contact

Info

Publication number: CN201708972U
Application number: CN2010202056418U
Authority: CN
Inventors: 杨远继
Original assignee: CHENGDU RONGGUANG CARBON Co Ltd
Current assignee: CHENGDU RONGGUANG CARBON Co Ltd
Priority date: 2010-05-26
Filing date: 2010-05-26
Publication date: 2011-01-12
Anticipated expiration: 2020-05-26

Abstract

The utility model provides a tripping preventive graphite electrode contact, which is provided with a hole for holding contact paste. The tripping preventive graphite electrode contact is characterized in that the hole for holding the contact paste is inclined downwards to form an inclined hole. The contact paste which is filled in the inclined hole, can be molten to flow out at the temperature of 140 DEG C and can be coked at the temperature higher than 300 DEG C can sufficiently flow out from the inclined hole on conditions of adding small quantities of foaming agent or not having the foaming agent after being molten, and coking quantity at the connection position of the contact and an electrode can be maximum, thereby stopping the contact and the electrode body from unclenching, greatly increasing fastening capability, reducing safety accidents such as electrode dropping or contact breakage, and increasing electric furnace smelting production efficiency and quality of products.

Description

A kind of anti-tripping graphite electrode nipple

Technical field:

The utility model relates to a kind of anti-tripping graphite electrode nipple.

Background technology:

Graphite electrode is to be used in deposite metal and other composition in the steel and iron industry, and deposite metal institute calorific requirement is that electric current passes through one group or a plurality of normally three groups of electrodes forms the electric arc generation between electrode and metal.Every group of electrode is by joint single electrode to be coupled together, and remains certain length and puts in the smelting furnace and constantly be consumed.

The requirement of connection electrode is the both ends of the surface by two electrode bodies of joint connection, in whole use, all must keep closely contact, can not produce the slit of a tiny bit, otherwise the joint that links two electrodes very easily fractures, continuity, the quality of product and the generation of security incident that influence is produced.

But in real work, owing to the vibrations that can produce huge play on the one hand because of the reason of electric arc, it is loosening that bond sites is produced, the magnetic field force direction that produces is opposite, under the effect of active force and reaction force, make the electrode rotation that is attached at the lower end, according to the loose just direction of moving back of the direction of screw law lower end electrode rotation, thereby can make the both ends of the surface of binding the slit occur.

Ways of addressing this issue has two kinds at present: a kind of is to beat pin in junction again after both ends of the surface link well.This method is by steel mill self operation, very inconvenience, and 90% steel mill has all eliminated this original method.Second kind is to utilize the coking of joint cream to prevent to thread off.2-4 hole beaten according to the size of joint diameter by electrode production producer on joint, in the hole, load onto then joint cream (joint cream be a kind of 140 ℃ fusible, at the cream of coking more than 300 ℃).In the electrode use, along with the rising of connector temperature, the fusing of joint cream is also flowed out from the hole, and coking on the screw thread of joint and electrode binding reaches the purpose that the prevention electrode moves back button under external force.Present this method is an industry method in common.Anti-tripping purpose to be reached in this way and following specification requirement must be satisfied:

1, joint cream must flow out from the hole, be in coking on joint and the screw thread that electrode contacts, and can not coking in the hole.

2, joint cream will concentrate on local coking after flowing out from the hole, and can not be extended to everywhere, otherwise does not guarantee that local coking amount does not reach anti-tripping purpose.

3, the amount of joint cream is The more the better, and coking amount is just many more like this, and anti-tripping effect is just good more.But the degree of depth in the hole of joint cream and diameter all can not be too big, otherwise can have influence on the intensity of joint, and the therefore coking amount in order to guarantee to flow out requires joint cream outflow the The more the better hole in.

But present this method has very big defective, can not reach above specification requirement, so in use all there is the dropout phenomenon in the product of each producer.Its defective:

1. being used for the hole of joint cream on the joint all is perpendicular to the joint axis, joint cream mainly is to add a certain proportion of charcoal micro mist by pitch to join some blowing agents again and mix, must lean on the volumetric expansion of the blowing agent middle release of melt could being portalled after the joint cream fusing, to reach the purpose of coking on joint and screw thread that electrode contacts.But although the effect of blowing agent is arranged, the amount that flows out from the hole at most also has only 1/2.

2. if reduce residual quantity in the hole, the amount that will increase blowing agent does not so just satisfy above-mentioned technical conditions 2 to increase volumetric expansion, misses one's aim.

If 3 with the degree of depth in the hole of strengthening joint cream and the requirement that diameter satisfies coking amount, do the intensity that can have influence on joint like this, lose more than gain on the contrary.

Summary of the invention:

The purpose of this utility model a kind ofly stops the pine of joint and electrode body to move back with regard to providing, and the snap close ability improves greatly, the anti-tripping graphite electrode nipple of the security incident that reduces that electrode comes off or joint fractures.

To achieve these goals, the utility model adopts following technical scheme:

The utility model provides a kind of anti-tripping graphite electrode nipple, and the hole of joint cream is arranged on the joint, and its key technology is: the downward-sloping formation inclined hole in the hole of joint cream.

Beat 2-4 on arbitrary position of joint 3 of the present utility model and be used for the inclined hole 4 of joint cream, inclined hole 4 is angled downward-sloping with joint 3 axis, becomes 20-60 degree angle with horizontal plane, the diameter 10-35mm of this inclined hole 4, degree of depth 30-50mm.

Be the outstanding effect that checking the utility model is obtained, the inventor has done following contrast test:

Experiment one:

As shown in Figure 3, straight shape hole dress bolt, joint cream fusing back discharge only has 50% of charge weight.

As shown in Figure 1, inclined hole dress bolt, joint cream fusing back discharge can reach 90% of charge weight.

Experiment two:

Steel mill uses the electric furnace actual tests at home.30 tons of used furnace volumes use electrode φ 400*1800, and joint φ 400T3 beats straight shape hole φ 30*40, beats inclined hole φ 30*40, and gradient becomes each 30 joint of 20-30 degree angle with level.In order to demonstrate fully two kinds of different hole shape dress bolt mode roles, needn't tighten when linking electrode, the upper/lower electrode end face stays 0.2mm (using clearance gauge observing and controlling) space.When electrode uses the bell hole site, measure upper/lower electrode end face space, when space 〉=1mm, be considered as moving back button.

Use result such as following table:

	Move back the button number of times	The joint number of times that fractures
			Straight shape hole	10/30	2/30
Inclined hole	1/30	0/30

From above correction data as can be seen, the joint cream amount that inclined hole flows out is many, and coking amount is just big, and the snap close ability improves, and joint is frangibility not.

Compared with prior art, the beneficial effect that the utlity model has is:

After the joint cream fusing that the utility model is adorned, in the small amount of foaming agent or do not have fully from inclined hole, to flow out under the situation of blowing agent, reach maximum at joint and electrode body junction coking amount, stop the pine of joint and electrode body to move back, reach anti-tripping purpose, the snap close ability improves greatly, the generation of security incident that the minimizing electrode comes off or joint fractures, the quality of raising electric furnace smelting production efficiency and product.

Description of drawings:

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model user mode figure;

Fig. 3 is a prior art joint design schematic diagram.

Embodiment:

Embodiment one:

Make a call to 2 inclined holes 4 that are used for joint cream on arbitrary position of joint 3 of the present utility model, this inclined hole 4 is downward-sloping, becomes 20 degree angles with horizontal plane.Not only will satisfy coking amount, not have influence on the intensity of joint simultaneously again, the degree of depth in the hole of joint cream and diameter all can not be too big, the diameter 10mm of this inclined hole 4, degree of depth 30mm.

In the electrode use, the inclined hole 4 of this joint 3 is equipped with 140 ℃ of fusible outflows, at the joint cream of coking more than 300 ℃, rising along with connector temperature, in the small amount of foaming agent or do not have under the situation of blowing agent, the fusing of joint cream is also fully flowed out from inclined hole 4, local coking on the screw thread that joint 3 and electrode 1, electrode 2 link reaches and stops electrode 1, electrode 2 to move back the purpose of button under external force.

Embodiment two:

Make a call to 3 inclined holes 4 that are used for joint cream on arbitrary position of joint 3 of the present utility model, this inclined hole 4 is downward-sloping, becomes 40 degree angles with horizontal plane, the diameter 25mm of this inclined hole 4, degree of depth 40mm.

Embodiment three:

Make a call to 4 inclined holes 4 that are used for joint cream on arbitrary position of joint 3 of the present utility model, this inclined hole 4 is downward-sloping, becomes 60 degree angles with horizontal plane, the diameter 35mm of this inclined hole 4, degree of depth 50mm.

Claims

1. anti-tripping graphite electrode nipple has the hole of joint cream on the joint (3), it is characterized in that: the downward-sloping formation inclined hole in the hole of joint cream (4).

2. anti-tripping graphite electrode nipple according to claim 1 is characterized in that: there is 2--4 inclined hole (4) arbitrary position of joint (3).

3. anti-tripping graphite electrode nipple according to claim 1 is characterized in that: the gradient of inclined hole (4) becomes 20-60 degree angle with horizontal plane.

4. anti-tripping graphite electrode nipple according to claim 1 is characterized in that: the diameter 10-35mm of inclined hole (4), degree of depth 30-50mm.