An ultrahigh power graphite electrode joint

Abstract

The utility model discloses an ultrahigh power graphite electrode joint, including intermediate block, round conical body connector, the tail of round conical body connector is connected to the both sides symmetry of intermediate block, and the glue injection guide groove is opened to the head direction from the middle part of round conical body connector, and the glue injection guide groove equidistance distribution is on round conical body connector, and the horizontal through -hole is set up to the axial line of intermediate block, and the longitudinal through -hole is set up to the radial line of intermediate block, and the horizontal through -hole extends to the inside of round conical body connector, and the inside of round conical body connector is set up to glue injection runner no.

Description

Technical Field

[0001] This utility model relates to the field of graphite electrode connector technology, specifically to an ultra-high power graphite electrode connector. Background Technology

[0002] Graphite electrodes are an essential raw material for electric arc furnace steelmaking, generally classified into ordinary power graphite electrodes and high-power graphite electrodes. Ordinary power graphite electrodes mainly use petroleum coke and coal tar pitch, while ultra-high power electrodes require the addition of needle coke (content ≥30%), with a significantly higher proportion of needle coke than high-power electrodes. The addition of needle coke gives the electrode better conductivity and thermal stability. Ultra-high power electrodes require high-temperature graphitization treatment above 3000℃ and a pressure impregnation process, resulting in significantly higher bulk density (≥1.70 g / cm³) and flexural strength (≥16.0 MPa) than ordinary power electrodes (bulk density ≥1.52 g / cm³, flexural strength ≥6.4 MPa). To meet the needs of electric arc furnace steelmaking, ultra-high power electrodes need to be connected together using graphite electrode joints to increase the current carrying capacity and reduce resistance loss during electric arc furnace steelmaking. Currently, the graphite electrode joints connecting the graphite electrodes have thread gaps after installation, resulting in unstable installation at the mating ends. Secondly, under high-temperature environments, the graphite electrode joints are prone to oxidation, loosening, and disengagement, which affects the normal operation of the electric arc furnace steelmaking process.

[0003] Therefore, there is a need to provide an ultra-high power graphite electrode connector. Utility Model Content

[0004] In view of the problems existing in the prior art, the present invention provides an ultra-high power graphite electrode connector, aiming to improve and solve the technical problems mentioned above.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: an ultra-high power graphite electrode connector, comprising a middle block and a conical connector, with the tail of the conical connector symmetrically connected to both sides of the middle block. The conical connector has a glue injection guide groove extending from the middle towards its head, and the glue injection guide grooves are evenly distributed on the conical connector. The middle block has a transverse through hole along its axis and a longitudinal through hole along its diameter. The transverse through hole extends into the conical connector, forming a glue injection channel one inside the conical connector. The extension end of the glue injection channel one is connected to each glue injection guide groove through a glue injection channel two.

[0006] Preferably, the extension length of the first injection channel is set at 1 / 3 of the centerline length of the conical connector.

[0007] Preferably, the length of the injection guide groove is not less than 1 / 2 times the centerline length of the conical connector.

[0008] Preferably, the gap between the conical connector and the conical female threaded hole of the graphite electrode is filled with adhesive.

[0009] Preferably, the adhesive is any one of a composite solution of silica sol, molten metal salt, coal tar pitch, or silver-graphene composite conductive adhesive.

[0010] Preferably, the adhesive is a silver-graphene composite conductive adhesive.

[0011] Preferably, the surfaces of the intermediate block and the conical connector are coated with a 0.5wt% graphene metal-ceramic coating.

[0012] In summary, this utility model provides an ultra-high power graphite electrode connector. This patent employs an adhesive that flows from a longitudinal through-hole to a transverse through-hole. The adhesive in the transverse through-hole flows to injection channel one, and then from injection channel one, it branches into various injection guide grooves. Part of the adhesive in the injection guide grooves flows into the gap between the head of the conical connector and the conical female threaded hole, while another part flows into the thread gap between the conical female threaded hole and the conical connector. As the pressure increases, adhesive is injected into the thread layer gap located at the conical connector. The adhesive is injected, preferably filling the head, middle and upper parts of the conical connector. With pressurized injection, the adhesive in the middle and upper parts of the conical connector becomes denser. Adhesive is also injected at the tail of the conical connector. This fills the gap between the conical connector and the graphite electrode. The addition of adhesive fills the thread gap, solving the technical problem of unstable installation at the mating end. Furthermore, the addition of adhesive avoids oxidation, solving the technical problems of loosening and disengagement. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the conical connector and graphite electrode mounting structure of this utility model; Figure 2 This is a sectional schematic diagram of the conical connector and graphite electrode mounting structure of this utility model; Figure 3 This is a schematic diagram of the conical connector structure of this utility model; In the diagram: 1. Middle block; 2. Conical connector; 3. Glue injection channel one; 4. Glue injection guide groove; 5. Glue injection channel two; 6. Metal-ceramic coating; 7. Longitudinal through hole; 8. Transverse through hole. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figures 1 to 3 As shown: This utility model is an ultra-high power graphite electrode connector, which solves the technical problems of threaded installation gaps between the graphite electrode connector and the graphite electrode, resulting in unstable installation at the mating end; secondly, the graphite electrode connector is prone to oxidation, loosening and disengagement under high temperature environment, which affects the normal operation of electric arc furnace steelmaking. The technical structure adopted in this patent includes a middle block 1 and a conical connector 2. The two sides of the middle block 1 are symmetrically connected to the tail of the conical connector 2. The conical connector 2 has a glue injection guide groove 4 from the middle to its head, and the glue injection guide groove 4 is evenly distributed on the conical connector 2. The middle block 1 has a transverse through hole 11 along its axis and a longitudinal through hole 7 along its diameter. The transverse through hole 11 extends into the conical connector 2, so that the inside of the conical connector 2 is opened as a glue injection channel 3. The extension end of the glue injection channel 3 is connected to each glue injection guide groove 4 through a glue injection channel 5.

[0016] Specifically, after the conical connector 2 is installed in the conical female threaded hole of the graphite electrode, adhesive is injected into the longitudinal through hole 7 on the intermediate block 1. During the adhesive injection process, a stepped pressure increase process (0.5MPa→0.8MPa→1.0MPa) is adopted to avoid adhesive splashing or pore blockage caused by sudden pressure changes. The adhesive flows through the longitudinal through hole 7 to the transverse through hole 11. The adhesive in the transverse through hole 11 flows to the adhesive injection channel 3, and then flows to each adhesive injection guide groove 4. Part of the adhesive in the adhesive injection guide groove 4 flows into the gap between the head of the conical connector 2 and the conical female threaded hole, and the other part flows into the thread gap between the conical female threaded hole and the conical connector 2. As the pressure increases, adhesive is injected into the thread layer gap where the conical connector 2 is located. After the adhesive is completely cured, the conical connector 2 and the graphite electrode are stably connected.

[0017] In at least one embodiment, to prevent adhesive splashing or pore blockage under pressure, the extension length of the adhesive injection channel 3 is set at 1 / 3 of the centerline length of the conical connector 2. The opening length of the adhesive injection guide groove 4 is not less than 1 / 2 times the centerline length of the conical connector 2, preferably equal to 2 / 3 of the centerline length of the conical connector 2. This ensures that the adhesive injection fills the head, middle, and head regions of the conical connector 2. With pressurized injection, the adhesive in the middle and head regions of the conical connector 2 becomes denser. Injection of adhesive at the tail of the conical connector 2 fills the gap between the conical connector 2 and the graphite electrode. The addition of adhesive fills the thread gap, solving the technical problem of unstable installation at the mating end. Furthermore, the addition of adhesive avoids oxidation, solving the technical problems of loosening and disengagement.

[0018] In at least one embodiment, the adhesive is any one of a composite solution of silica sol, molten metal salt, coal tar pitch, or silver-graphene composite conductive adhesive.

[0019] In at least one embodiment, the adhesive is a silver-graphene composite conductive adhesive. The silver-graphene composite conductive adhesive has inherent properties such as efficient heat conduction path, anti-oxidation protection, and precision filling, which better meets the technical requirements of ensuring a stable connection between the conical female threaded hole and the conical connector 2, avoiding loosening and disengagement.

[0020] In at least one embodiment, in order to further improve the oxidation resistance, durability and high temperature resistance of the conical connector 2, a metal-ceramic coating 6 with 0.5wt% graphene is applied to both the intermediate block 1 and the surface of the conical connector 2.

[0021] The embodiments described in this utility model are for illustrative purposes only and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutions that can be conceived by those skilled in the art are all within the protection scope of this utility model.

Claims

1. An ultra-high power graphite electrode connector, characterized in that, The device includes a middle block (1) and a conical connector (2). The two sides of the middle block (1) are symmetrically connected to the tail of the conical connector (2). The conical connector (2) has a glue injection guide groove (4) from the middle to its head. The glue injection guide grooves (4) are evenly distributed on the conical connector (2). The middle block (1) has a transverse through hole (11) along its axis and a longitudinal through hole (7) along its diameter. The transverse through hole (11) extends into the conical connector (2) and makes the conical connector (2) have a glue injection channel one (3). The extension end of the glue injection channel one (3) is connected to each glue injection guide groove (4) through the glue injection channel two (5).

2. The ultra-high power graphite electrode connector according to claim 1, characterized in that, The extension length of the injection channel 1 (3) is set at 1 / 3 of the centerline length of the conical connector (2).

3. The ultra-high power graphite electrode connector according to claim 1, characterized in that, The length of the injection guide groove (4) shall not be less than 1 / 2 times the length of the centerline of the conical connector (2).

4. The ultra-high power graphite electrode connector according to claim 1, characterized in that, The gap between the conical connector (2) and the conical female threaded hole of the graphite electrode is filled with adhesive.

5. The ultra-high power graphite electrode connector according to claim 4, characterized in that, The adhesive can be any one of the following: a composite solution of silica sol, molten metal salt, coal tar pitch, or silver-graphene composite conductive adhesive.

6. The ultra-high power graphite electrode connector according to claim 5, characterized in that, The adhesive used is a silver-graphene composite conductive adhesive.

7. The ultra-high power graphite electrode connector according to claim 1, characterized in that, The surfaces of the intermediate block (1) and the conical connector (2) are coated with a 0.5wt% graphene metal-ceramic coating (6).

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