Multi-angle carbon injection device for electric arc furnace

Abstract

The present application relates to electric arc furnace steelmaking equipment technical field, especially to a kind of electric arc furnace multi-angle carbon injection device, including pedestal, support arm, gun driving mechanism, carbon gun body, carbon powder supply system, anti-blocking air blowing device and external control system;The pedestal includes cylindrical seat, and rotating seat is rotationally arranged at the top of cylindrical seat;The support arm includes first branch arm, which is rotationally arranged at the top of rotating seat, and second branch arm, which is rotationally arranged at the top of first branch arm;By setting pedestal, support arm, gun driving mechanism, carbon gun body, carbon powder supply system and anti-blocking air blowing device, the device can realize 360° omnidirectional carbon injection, eliminate injection dead zone: nozzle realizes autonomous rotation by rotary drive unit, cooperate 10°-45° adjustable injection angle, break through mechanical arm swing limit, carbon powder evenly covers all areas in furnace, especially suitable for high-power large-capacity electric arc furnace.

Description

Technical Field

[0001] This invention relates to the field of electric arc furnace steelmaking equipment technology, and in particular to a multi-angle carbon injection device for an electric arc furnace. Background Technology

[0002] In electric arc furnace steelmaking, carbon injection at the furnace door is a key process for achieving foamy slag formation, increasing carbon content in molten steel, and saving energy and reducing consumption. Currently, mainstream carbon injection equipment is mainly divided into two categories: one is a carbon-oxygen composite lance integrated with an oxygen lance, where the water-cooled oxygen lance and carbon lance work in tandem at the furnace door; the other is a separately installed carbon powder lance, which relies on a robotic arm or manual operation for lance feeding and positioning. However, existing equipment has the following prominent drawbacks in practical applications:

[0003] 1. Limited carbon spray coverage and significant dead zones: Existing carbon lances are mostly fixed structures with no autonomous rotation of the lance head. They rely solely on the swinging of a robotic arm to adjust the spray position. However, due to the size of the furnace door, the swing angle is usually limited to within 30°, resulting in large carbon spray blind zones inside the furnace. This is especially problematic for high-power electric arc furnaces, where the furnace space is vast, making it difficult for carbon powder to distribute evenly and severely affecting smelting uniformity.

[0004] 2. Fixed spraying angle and low carbon powder utilization: The fixed spraying angle of the nozzle cannot adapt to the fluctuation of the molten steel surface and the change of slag layer thickness. As a result, most of the carbon powder is sprayed onto the slag surface rather than into the molten steel, resulting in carbon powder waste, poor carbonization effect, and high smelting costs.

[0005] While existing technologies have made improvements to the spray gun structure (such as combined forged oxygen lance nozzles and robotic arm-driven spray guns), they have not solved core issues such as autonomous nozzle rotation, multi-angle adaptation, online anti-clogging, and rapid response adjustment.

[0006] Therefore, there is an urgent need to develop a new type of carbon injection device that integrates self-rotation, multi-angle injection, anti-clogging and clearing, rapid adjustment and backup functions. Summary of the Invention

[0007] The purpose of this invention is to solve at least one technical problem mentioned in the background art.

[0008] This invention provides a multi-angle carbon injection device for an electric arc furnace, including a base, a support arm, a lance driving mechanism, a carbon lance body, a carbon powder supply system, an anti-clogging air blowing device, and an external control system.

[0009] The base includes a cylindrical base and a rotating base rotatably disposed on the top of the cylindrical base;

[0010] The support arm includes a first arm rotatably disposed on top of the rotating seat, and a second arm rotatably disposed on top of the first arm;

[0011] The gun-feeding drive mechanism includes a slide rail disposed at the front end of the second arm and a slide seat slidably disposed on the surface of the slide rail, and the surface of the slide rail is provided with a gun-feeding drive motor for driving the slide seat to slide.

[0012] The carbon gun body includes, from back to front along the axis, a gun tail connecting section fixed to the end of the sliding seat, a gun barrel body and a nozzle assembly. The nozzle assembly includes a nozzle seat fixed to the front end of the gun barrel body and a rotating sleeve disposed inside the nozzle seat. A nozzle is fixed to the front end of the rotating sleeve.

[0013] The toner supply system includes a pneumatic delivery pipeline rotatably mounted at the front end of the toner gun body, a pressurized toner storage tank, and a rotary sealing joint.

[0014] Preferably, a first rotating seat is fixedly provided on the top of the rotating seat, the bottom end of the first support arm is rotatably connected to the inner wall of the first rotating seat through a first rotating shaft, a rotating opening is provided on the top of the first support arm, and the rear end of the second support arm is rotatably connected to the inner wall of the rotating opening through a connecting shaft.

[0015] By adopting the above technical solution, the bottom end of the first arm can be rotatably connected to the top of the rotating seat, and the bottom end of the second arm can be rotatably connected to the top end of the first arm.

[0016] Preferably, the cylindrical base is a hollow structure, and the top of the cylindrical base has a rotation opening for the rotating base to rotate. A rotary motor is fixedly installed on the inner bottom wall of the cylindrical base. An output shaft is fixedly installed at the output end of the rotary motor. A drive gear is fixedly installed on the surface of the output shaft. A connecting shaft is fixedly installed at the bottom end of the rotating base, and a driven gear that meshes with the drive gear is fixedly installed on the surface of the connecting shaft. An arc-shaped vent opening is opened on the outer surface of the cylindrical base, and an arc-shaped vent mesh is fixedly installed on the inner wall of the arc-shaped vent opening.

[0017] By adopting the above technical solution, the rotation of the rotary motor can drive the output shaft and the drive gear disk to rotate, thereby driving the driven gear disk and the connecting shaft to rotate, which in turn drives the rotary seat to decelerate and rotate. Moreover, the arc-shaped vent mesh facilitates heat dissipation for the rotary motor.

[0018] Preferably, a second rotating seat is fixedly provided on the upper surface of the rotating seat, and a third rotating seat corresponding to the second rotating seat is fixedly provided on the surface of the first support arm. A first hydraulic rod is rotatably provided on the inner wall of the second rotating seat through a second rotating shaft. The telescopic end of the first hydraulic rod is rotatably connected to the inner wall of the third rotating seat through a third rotating shaft. A fourth rotating seat is also fixedly provided on the surface of the first support arm, and a fifth rotating seat is fixedly provided on the surface of the second support arm. A second hydraulic rod is rotatably provided on the inner wall of the fourth rotating seat through a fourth rotating shaft. The telescopic end of the second hydraulic rod is rotatably connected to the inner wall of the fifth rotating seat through a fifth rotating shaft.

[0019] By adopting the above technical solution, the angles of the first and second arms can be quickly adjusted by extending and retracting the first and second hydraulic rods, respectively.

[0020] Preferably, the rotating sleeve is rotatably mounted inside the nozzle holder via a bearing, and a rotation angle encoder is provided on the inner wall of the rotating sleeve. The nozzle has a toner injection channel and several auxiliary gas injection holes inside. The axis of the toner injection channel forms an angle of 10° to 45° with the axis of the gun barrel body, and a small motor for driving the rotating sleeve to rotate is provided inside the nozzle holder.

[0021] By adopting the above technical solution, 360° omnidirectional spraying can be achieved by rotating the sleeve.

[0022] Preferably, the pressurized toner storage tank is disposed on the surface of the gun barrel body. The upper part of the pressurized toner storage tank is provided with a feed inlet and an exhaust valve, and the lower part is provided with a powder outlet and a flow regulating valve. One end of the pneumatic conveying pipeline is connected to the powder outlet of the pressurized toner storage tank, and the other end is connected to the gun tail section through a rotary sealing joint. The pneumatic conveying pipeline is provided with a main airflow regulating valve, a pressure sensor and a flow meter in sequence. The rotary sealing mechanism adopts a coaxial inner ring and outer ring structure. The inner ring rotates synchronously with the carbon gun body, and the outer ring is fixed to the conveying pipeline. A sealing ring and a ball bearing are provided between the inner ring and the outer ring.

[0023] By adopting the above technical solution, it is ensured that the toner and airflow are continuously delivered while the gun body is rotating, without leakage.

[0024] Preferably, the anti-clogging air blowing device includes an annular air chamber opened between the nozzle seat and the rotating sleeve, the annular air chamber being connected to a high-pressure compressed air source, and a plurality of blowing holes being evenly opened circumferentially on the outer wall of the rotating sleeve.

[0025] By adopting the above technical solution, when the pressure sensor detects abnormal pipeline pressure, the controller starts the pulse purging program. High-pressure air is pushed back into the inner cavity of the rotating sleeve through the annular air chamber and purging hole to clear the carbon powder clogging at the nozzle online without stopping the machine or disassembling the nozzle.

[0026] Preferably, the cylindrical base is provided with a self-lubricating mechanism. The self-lubricating mechanism includes a sealing plate fixed to the inner wall of the cylindrical base. The surface of the sealing plate is provided with a first through hole and a second through hole for the output shaft and the connecting shaft to rotate. The self-lubricating mechanism also includes an arc-shaped oil storage box fixed to the inner bottom wall of the cylindrical base. The top inner side wall of the arc-shaped oil storage box is provided with a filling pipe extending to the outer surface of the cylindrical base, and the top of the filling pipe is provided with a sealing plug. Lubricating oil is added to the inside of the arc-shaped oil storage box through the filling pipe. The inner bottom of the arc-shaped oil storage box is provided with a lubrication pipe extending to the upper surface of the sealing plate. The top of the lubrication pipe is provided with a drip head corresponding to the tooth groove of the driven gear plate.

[0027] By adopting the above technical solution, the lubricating oil dripping from the drip head at the end of the lubrication pipe can automatically lubricate the tooth groove of the driven tooth disk, thereby achieving automatic lubrication at the meshing point between the driven tooth disk and the driving tooth disk.

[0028] Preferably, the self-lubricating mechanism further includes a reciprocating threaded column fixed to the bottom end of the connecting shaft. The outer surface of the reciprocating threaded column is threadedly connected to a lifting plate. A pressure cylinder is fixed to the inner bottom wall of the cylindrical seat. A piston plate is slidably arranged on the inner wall of the pressure cylinder. A connecting rod extending to the top of the pressure cylinder is fixed to the top of the piston plate. A sliding hole for the connecting rod to slide is opened on the top of the pressure cylinder. The top end of the connecting rod is fixedly connected to the lower surface of the lifting plate. Two limiting rods are fixed to the inner bottom wall of the cylindrical seat. A limiting hole that slidably connects to the surfaces of the two limiting rods is opened on the surface of the lifting plate.

[0029] By adopting the above technical solution, the rotation of the connecting shaft can drive the reciprocating threaded column to rotate, thereby driving the lifting plate to automatically reciprocate and rise, and then driving the piston plate to automatically reciprocate and rise inside the pressure cylinder through the connecting rod.

[0030] Preferably, the bottom outer surface of the pressure cylinder is provided with an air intake pipe and a pressure pipe, the end of the air intake pipe is provided with a mesh filter cover, the other end of the pressure pipe extends to the inner top of the arc-shaped oil storage box, and the surfaces of the air intake pipe and the pressure pipe are respectively provided with an air intake one-way valve and a pressure one-way valve.

[0031] By adopting the above technical solution, when the piston disc moves upward, the pressure cylinder can draw in external air through the suction pipe, and when the piston disc moves downward, the air in the pressure cylinder can be forced into the arc-shaped oil reservoir through the pressure pipe.

[0032] In summary, the present invention has at least one of the following beneficial technical effects:

[0033] 1. The multi-angle carbon injection device for electric arc furnaces described in this invention, by setting up a base, support arm, lance driving mechanism, carbon lance body, carbon powder supply system, and anti-clogging air blowing device, enables the device to achieve 360° omnidirectional carbon injection, eliminating injection dead zones: the nozzle achieves autonomous rotation through a rotary driving unit, combined with an adjustable injection angle of 10° to 45°, overcoming the swing limitations of the robotic arm, and ensuring uniform carbon powder coverage of all areas inside the furnace, making it particularly suitable for high-power, large-capacity electric arc furnaces, while significantly improving carbon powder utilization: the multi-angle injection design can adapt to molten steel in real time. The change in surface and slag layer thickness guides the carbon powder directly into the molten steel, reducing slag adsorption loss, increasing carbon enrichment efficiency by more than 30%, and reducing carbon powder consumption by 20%. Secondly, online anti-clogging and clearing ensures continuity: the reverse pulse purging device can clear nozzle blockage without stopping the machine, avoiding production interruptions caused by disassembling the lance for cleaning, improving smelting continuity by more than 95%. Moreover, the carbon injection volume responds quickly: the sensor real-time feedback + valve linkage control shortens the adjustment response time to the millisecond level, accurately matching the foam slag state and avoiding excess or insufficient carbon powder.

[0034] 2. The multi-angle carbon injection device for an electric arc furnace described in this invention, by setting a self-lubricating mechanism, enables the device to operate in a manner where, during actual use, the rotating motor drives the active gear disc to rotate, which in turn drives the driven gear disc and the connecting shaft to rotate. The rotation of the connecting shaft drives the reciprocating threaded column to rotate, and the rotation of the reciprocating threaded column causes the lifting disc to move automatically up and down under the action of the limit rod. When the lifting disc moves downward, it can drive the piston disc to move downward through the connecting rod. When the piston disc moves downward, it can compress the inside of the pressure cylinder, causing the air in the pressure cylinder to enter the arc-shaped oil storage box through the pressure pipe. This allows the lubricating oil in the arc-shaped oil storage box to automatically drip into the tooth groove of the driven gear disc through the lubrication pipe and the drip head at the end of the lubrication pipe, thereby achieving automatic lubrication of the meshing point between the driven gear disc and the active gear disc. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 This is a schematic diagram of the rear view structure of the present invention;

[0037] Figure 3 This is a side view of the structure of the present invention;

[0038] Figure 4 This is a schematic diagram of the cross-sectional structure of the cylindrical base of the present invention;

[0039] Figure 5 This is the present invention. Figure 4 Enlarged structural diagram at point A in the middle;

[0040] Figure 6 This is the present invention. Figure 4Enlarged structural diagram at point B;

[0041] Figure 7 This is a top-section schematic diagram of the connecting shaft structure of the present invention;

[0042] Figure 8 This is a schematic diagram of the reciprocating lead screw structure of the present invention.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Base; 101. Columnar base; 102. Rotary base; 103. Rotary motor; 104. Output shaft; 105. Drive gear plate; 106. Connecting shaft; 107. Driven gear plate; 108. Arc-shaped ventilation mesh;

[0045] 200. Support arm; 201. First support arm; 202. Second support arm; 203. First hydraulic rod; 204. Second hydraulic rod;

[0046] 300. Gun feed drive mechanism;

[0047] 400. Carbon gun body;

[0048] 500. Toner supply system;

[0049] 600. Anti-clogging air blowing device;

[0050] 700. Self-lubricating mechanism; 701. Sealing plate; 702. Arc-shaped oil reservoir; 703. Lubrication pipe; 704. Reciprocating threaded column; 705. Lifting plate; 706. Pressure cylinder; 707. Piston plate; 708. Connecting rod; 709. Limiting rod; 7010. Suction pipe; 7011. Pressure pipe. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 1 To be continued Figure 8 The present invention will be further described in detail below.

[0052] Example 1

[0053] Please refer to the following carefully. Figures 1 to 5A multi-angle carbon injection device for an electric arc furnace includes a base 100, a support arm 200, a lance driving mechanism 300, a carbon lance body 400, a carbon powder supply system 500, an anti-clogging air blowing device 600, and an external control system. The base 100 includes a cylindrical seat 101 and a rotating seat 102 rotatably disposed on top of the cylindrical seat 101. The support arm 200 includes a first arm 201 rotatably disposed on top of the rotating seat 102 and a second arm 202 rotatably disposed on top of the first arm 201. The lance driving mechanism 300 includes a lance disposed at the front end of the second arm 202. The slide rail and the sliding seat slidably disposed on the surface of the slide rail, and the surface of the slide rail is provided with a gun-feeding drive motor for driving the sliding seat to slide; the carbon gun body 400 includes, from back to front along the axis, a gun tail connecting section fixed to the end of the sliding seat, a gun barrel body and a nozzle assembly, the nozzle assembly including a nozzle seat fixed to the front end of the gun barrel body and a rotating sleeve disposed inside the nozzle seat, the front end of the rotating sleeve being fixed with a nozzle; the toner supply system 500 includes a pneumatic conveying pipeline rotatably disposed at the front end of the carbon gun body 400, a pressurized toner storage tank and a rotary sealing joint.

[0054] Please refer to this carefully. Figure 2 , Figure 3 The top of the rotating seat 102 is fixedly provided with a first rotating seat, the bottom end of the first support arm 201 is rotatably connected to the inner wall of the first rotating seat through a first rotating shaft, the top of the first support arm 201 is provided with a rotating opening, and the rear end of the second support arm 202 is rotatably connected to the inner wall of the rotating opening through a connecting shaft.

[0055] Specifically, the bottom end of the first arm 201 can be rotatably connected to the top of the rotating seat 102, while the bottom end of the second arm 202 can be rotatably connected to the top end of the first arm 201.

[0056] Please refer to this carefully. Figure 4 , Figure 5 The cylindrical base 101 is a hollow structure, and the top of the cylindrical base 101 has a rotation opening for the rotating base 102 to rotate. The inner bottom wall of the cylindrical base 101 is fixed with a rotary motor 103, the output end of the rotary motor 103 is fixed with an output shaft 104, the surface of the output shaft 104 is fixed with a drive gear 105, the bottom end of the rotating base 102 is fixed with a connecting shaft 106, and the surface of the connecting shaft 106 is fixed with a driven gear 107 that meshes with the drive gear 105. The outer surface of the cylindrical base 101 has an arc-shaped ventilation opening, and the inner wall of the arc-shaped ventilation opening is fixed with an arc-shaped ventilation mesh 108.

[0057] Specifically, the rotation of the rotary motor 103 can drive the output shaft 104 and the drive gear 105 to rotate, thereby driving the driven gear 107 and the connecting shaft 106 to rotate, which in turn drives the rotating seat 102 to rotate at a reduced speed. Moreover, the arc-shaped ventilation mesh 108 facilitates heat dissipation for the rotary motor 103.

[0058] Please refer to this carefully. Figure 2 , Figure 3 A second rotating seat is fixedly provided on the upper surface of the rotating seat 102, and a third rotating seat corresponding to the second rotating seat is fixedly provided on the surface of the first support arm 201. A first hydraulic rod 203 is rotatably provided on the inner wall of the second rotating seat through a second rotating shaft. The telescopic end of the first hydraulic rod 203 is rotatably connected to the inner wall of the third rotating seat through a third rotating shaft. A fourth rotating seat is also fixedly provided on the surface of the first support arm 201, and a fifth rotating seat is fixedly provided on the surface of the second support arm 202. A second hydraulic rod 204 is rotatably provided on the inner wall of the fourth rotating seat through a fourth rotating shaft. The telescopic end of the second hydraulic rod 204 is rotatably connected to the inner wall of the fifth rotating seat through a fifth rotating shaft.

[0059] Specifically, the angles of the first arm 201 and the second arm 202 can be quickly adjusted by extending and retracting the first hydraulic rod 203 and the second hydraulic rod 204, respectively.

[0060] Please refer to this carefully. Figure 2 , Figure 3 The rotating sleeve is rotatably mounted inside the nozzle holder via a bearing, and a rotation angle encoder is installed on the inner wall of the rotating sleeve. The nozzle has a carbon powder injection channel and several auxiliary gas injection holes inside. The axis of the carbon powder injection channel forms an angle of 10° to 45° with the axis of the gun barrel body, and a small motor for driving the rotating sleeve to rotate is installed inside the nozzle holder.

[0061] Specifically, 360° omnidirectional spraying can be achieved by rotating the sleeve.

[0062] Please refer to this carefully. Figure 2 , Figure 3 The pressurized toner storage tank is installed on the surface of the gun barrel body. The upper part of the pressurized toner storage tank is equipped with a feed port and an exhaust valve, and the lower part is equipped with a powder outlet and a flow regulating valve. One end of the pneumatic conveying pipeline is connected to the powder outlet of the pressurized toner storage tank, and the other end is connected to the gun tail section through a rotary sealing joint. The pneumatic conveying pipeline is equipped with a main airflow regulating valve, a pressure sensor and a flow meter in sequence. The rotary sealing mechanism adopts a coaxial inner ring and outer ring structure. The inner ring rotates synchronously with the carbon gun body at 40°, and the outer ring is fixed to the conveying pipeline. A sealing ring and a ball bearing are provided between the inner ring and the outer ring.

[0063] Specifically, it ensures that the toner and airflow are continuously delivered while the gun body is rotating, without any leakage.

[0064] Please refer to this carefully. Figure 2 , Figure 3 The anti-clogging air blowing device 600 includes an annular air chamber opened between the nozzle seat and the rotating sleeve. The annular air chamber is connected to a high-pressure compressed air source. Several blowing holes are evenly opened on the outer wall of the rotating sleeve along the circumference.

[0065] Specifically, when the pressure sensor detects an abnormal pipeline pressure, the controller starts the pulse purging program. High-pressure air is pushed back into the inner cavity of the rotating sleeve through the annular air chamber and purging hole to clear the carbon powder clogging at the nozzle online without stopping the machine or disassembling the nozzle.

[0066] One point that needs special explanation is:

[0067] The external control system of this invention is centered on a controller and electrically connected to a rotary drive unit, a gun-feeding drive motor, a flow regulating valve, a main airflow regulating valve, and various sensors including a rotation angle encoder, a gun-feeding position sensor, a furnace cover switch sensor, a pressure sensor, and a flow meter. It achieves the following functions: Automatic gun-feeding / retraction: Linked with the furnace cover switch sensor, when a furnace cover opening signal is detected, the support arm 200° is immediately driven to fold, and the gun-feeding mechanism retracts, quickly withdrawing the carbon gun from the furnace door area; after the furnace cover is closed and the electrodes are energized, the gun-feeding program is automatically executed, sending the carbon gun to the preset working position; Rotation angle and speed control: Through feedback signals from the rotation angle encoder, the nozzle rotation angle (0°~360°) and rotation speed are precisely adjusted to adapt to the carbon spraying coverage requirements of different furnace types; Rapid adjustment of carbon spraying quantity: Based on real-time data from the flow meter and pressure sensor, and feedback from the state of foam slag inside the furnace, it can be connected to the furnace gas analysis system. Through linkage control between the flow regulating valve and the main airflow regulating valve, millisecond-level response adjustment of the carbon spraying quantity is achieved; Fault alarm and interlock: When nozzle blockage, abnormal pipeline pressure, or a 400° malfunction of the carbon gun body is detected, an alarm signal is immediately issued.

[0068] In this embodiment, by setting up a base 100, a support arm 200, a gun-feeding drive mechanism 300, a carbon gun body 400, a carbon powder supply system 500, and an anti-clogging air-blowing device 600, the device can achieve 360° omnidirectional carbon spraying, eliminating spray dead zones. The nozzle achieves autonomous rotation through a rotary drive unit, and with an adjustable spray angle of 10° to 45°, it overcomes the swing limitations of the robotic arm, ensuring that carbon powder evenly covers all areas inside the furnace. This is especially suitable for high-power, large-capacity electric arc furnaces, while significantly improving carbon powder utilization. The multi-angle spray design can adapt to steel in real time. Changes in the water level and slag layer thickness guide carbon powder directly into the molten steel, reducing slag adsorption losses and increasing carbon enrichment efficiency by over 30%, while reducing carbon powder consumption by 20%. Secondly, online anti-clogging and clearing ensures continuity: the reverse pulse purging device can clear nozzle blockages without stopping the machine, avoiding production interruptions caused by disassembling the lance for cleaning, improving smelting continuity by over 95%. Moreover, the carbon injection volume responds quickly: using real-time sensor feedback and valve linkage control, the adjustment response time is shortened to the millisecond level, accurately matching the foam slag state and avoiding excess or insufficient carbon powder.

[0069] Example 2

[0070] Based on Example 1, referring to Figures 4 to 8 And unlike Example 1, the following is true:

[0071] Please refer to this carefully. Figure 4 , Figure 6 The cylindrical base 101 is equipped with a self-lubricating mechanism 700. The self-lubricating mechanism 700 includes a sealing plate 701 fixed to the inner wall of the cylindrical base 101. The surface of the sealing plate 701 is provided with a first through hole and a second through hole for the output shaft 104 and the connecting shaft 106 to rotate. The self-lubricating mechanism 700 also includes an arc-shaped oil storage box 702 fixed to the inner bottom wall of the cylindrical base 101. The top inner side wall of the arc-shaped oil storage box 702 is provided with a filling pipe extending to the outer surface of the cylindrical base 101, and the top of the filling pipe is provided with a sealing plug. The arc-shaped oil storage box 702 is filled with lubricating oil through the filling pipe. The inner bottom of the arc-shaped oil storage box 702 is provided with a lubrication pipe 703 extending to the upper surface of the sealing plate 701. The top of the lubrication pipe 703 is provided with a drip head corresponding to the tooth groove of the driven gear plate 107.

[0072] Specifically, the lubricating oil dripped from the drip head at the end of the lubrication pipe 703 can automatically lubricate the tooth groove of the driven tooth disk 107, thereby achieving automatic lubrication at the meshing point between the driven tooth disk 107 and the driving tooth disk 105.

[0073] Please refer to this carefully. Figure 4 , Figure 6The self-lubricating mechanism 700 also includes a reciprocating threaded column 704 fixed at the bottom end of the connecting shaft 106. The outer surface of the reciprocating threaded column 704 is threadedly connected to a lifting plate 705. The inner bottom wall of the cylindrical seat 101 is fixedly provided with a pressure cylinder 706. The inner wall of the pressure cylinder 706 is slidably provided with a piston plate 707. The top of the piston plate 707 is fixedly provided with a connecting rod 708 extending to the top of the pressure cylinder 706. The top of the pressure cylinder 706 is provided with a sliding hole for the connecting rod 708 to slide. The top end of the connecting rod 708 is fixedly connected to the lower surface of the lifting plate 705. The inner bottom wall of the cylindrical seat 101 is fixedly provided with two limiting rods 709. The surface of the lifting plate 705 is provided with limiting holes that are slidably connected to the surfaces of the two limiting rods 709.

[0074] Specifically, the rotation of the connecting shaft 106 can drive the reciprocating threaded column 704 to rotate, thereby driving the lifting plate 705 to automatically reciprocate and rise, and then driving the piston plate 707 to automatically reciprocate and rise inside the pressure cylinder 706 via the connecting rod 708.

[0075] Please refer to this carefully. Figure 4 , Figure 6 The bottom outer surface of the pressure cylinder 706 is provided with an air intake pipe 7010 and a pressure pipe 7011, respectively. The end of the air intake pipe 7010 is provided with a mesh filter cover, and the other end of the pressure pipe 7011 extends to the inner top of the arc-shaped oil storage box 702. The surfaces of the air intake pipe 7010 and the pressure pipe 7011 are respectively provided with an air intake check valve and a pressure check valve.

[0076] Specifically, when the piston disc 707 moves upward, the pressure cylinder 706 can draw in external air through the suction pipe 7010, and when the piston disc 707 moves downward, the air in the pressure cylinder 706 can be forced into the arc-shaped oil reservoir 702 through the pressure pipe 7011.

[0077] In this embodiment, by setting a self-lubricating mechanism 700, during actual use, when the drive gear 105 is driven by the rotary motor 103 to rotate, which in turn drives the driven gear 107 and the connecting shaft 106, the rotation of the connecting shaft 106 drives the reciprocating threaded column 704 to rotate. The rotation of the reciprocating threaded column 704 drives the lifting plate 705 to move up and down automatically under the action of the limiting rod 709. When the lifting plate 705 moves downward, it can drive the piston plate 707 to move downward through the connecting rod 708. When the piston plate 707 moves downward, it can squeeze the inside of the pressure cylinder 706, so that the air in the pressure cylinder 706 enters the arc-shaped oil storage box 702 through the pressure pipe 7011. Thus, the lubricating oil in the arc-shaped oil storage box 702 can be automatically dripped into the tooth groove of the driven gear 107 through the lubrication pipe 703 and the drip head at the end of the lubrication pipe 703, thereby realizing automatic lubrication of the meshing point between the driven gear 107 and the drive gear 105.

Claims

1. A multi-angle carbon injection device for an electric arc furnace, characterized in that, It includes a base (100), a support arm (200), a gun feeding drive mechanism (300), a carbon gun body (400), a carbon powder supply system (500), an anti-clogging air blowing device (600), and an external control system; The base (100) includes a cylindrical base (101) and a rotating base (102) rotatably disposed on the top of the cylindrical base (101). The support arm (200) includes a first arm (201) rotatably disposed on the top of the rotating seat (102), and a second arm (202) rotatably disposed on the top of the first arm (201). The gun-feeding drive mechanism (300) includes a slide rail disposed at the front end of the second arm (202) and a slide seat slidably disposed on the surface of the slide rail, and the surface of the slide rail is provided with a gun-feeding drive motor for driving the slide seat to slide. The carbon gun body (400) includes, from back to front along the axis, a gun tail connecting section fixed to the end of the sliding seat, a gun barrel body and a nozzle assembly. The nozzle assembly includes a nozzle seat fixed to the front end of the gun barrel body and a rotating sleeve disposed inside the nozzle seat. A nozzle is fixed to the front end of the rotating sleeve. The toner supply system (500) includes a pneumatic delivery pipeline rotatably disposed at the front end of the carbon gun body (400), a pressurized toner storage tank, and a rotary sealing joint.

2. The multi-angle carbon injection device for an electric arc furnace according to claim 1, characterized in that, The top of the rotating seat (102) is fixedly provided with a first rotating seat, the bottom end of the first support arm (201) is rotatably connected to the inner wall of the first rotating seat through a first rotating shaft, the top of the first support arm (201) is provided with a rotating opening, and the rear end of the second support arm (202) is rotatably connected to the inner wall of the rotating opening through a connecting shaft.

3. The multi-angle carbon injection device for an electric arc furnace according to claim 2, characterized in that, The cylindrical base (101) is a hollow structure, and the top of the cylindrical base (101) is provided with a rotating opening for the rotating base (102) to rotate. A rotary motor (103) is fixedly installed on the inner bottom wall of the cylindrical base (101). An output shaft (104) is fixedly installed at the output end of the rotary motor (103). An active gear disk (105) is fixedly installed on the surface of the output shaft (104). A connecting shaft (106) is fixedly installed at the bottom end of the rotating base (102), and a driven gear disk (107) that meshes with the active gear disk (105) is fixedly installed on the surface of the connecting shaft (106). An arc-shaped ventilation opening is provided on the outer surface of the cylindrical base (101), and an arc-shaped ventilation mesh (108) is fixedly installed on the inner wall of the arc-shaped ventilation opening.

4. The multi-angle carbon injection device for an electric arc furnace according to claim 3, characterized in that, The upper surface of the rotating seat (102) is fixed with a second rotating seat, and the surface of the first support arm (201) is fixed with a third rotating seat corresponding to the second rotating seat. The inner wall of the second rotating seat is rotatably provided with a first hydraulic rod (203) through a second rotating shaft. The telescopic end of the first hydraulic rod (203) is rotatably connected to the inner wall of the third rotating seat through a third rotating shaft. The surface of the first support arm (201) is also fixed with a fourth rotating seat, and the surface of the second support arm (202) is fixed with a fifth rotating seat. The inner wall of the fourth rotating seat is rotatably provided with a second hydraulic rod (204) through a fourth rotating shaft. The telescopic end of the second hydraulic rod (204) is rotatably connected to the inner wall of the fifth rotating seat through a fifth rotating shaft.

5. The multi-angle carbon injection device for an electric arc furnace according to claim 4, characterized in that, The rotating sleeve is rotatably mounted inside the nozzle holder via a bearing, and a rotation angle encoder is installed on the inner wall of the rotating sleeve. The nozzle has a toner injection channel and several auxiliary gas injection holes inside. The axis of the toner injection channel forms an angle of 10° to 45° with the axis of the main body of the gun barrel. A small motor for driving the rotating sleeve to rotate is installed inside the nozzle holder.

6. The multi-angle carbon injection device for an electric arc furnace according to claim 5, characterized in that, The pressurized toner storage tank is installed on the surface of the gun barrel body. The upper part of the pressurized toner storage tank is provided with a feed port and an exhaust valve, and the lower part is provided with a powder outlet and a flow regulating valve. One end of the pneumatic conveying pipeline is connected to the powder outlet of the pressurized toner storage tank, and the other end is connected to the gun tail section through a rotary sealing joint. The pneumatic conveying pipeline is provided with a main airflow regulating valve, a pressure sensor and a flow meter in sequence. The rotary sealing mechanism adopts a coaxial inner ring and outer ring structure. The inner ring rotates synchronously with the carbon gun body (400), and the outer ring is fixed to the conveying pipeline. A sealing ring and a ball bearing are provided between the inner ring and the outer ring.

7. The multi-angle carbon injection device for an electric arc furnace according to claim 6, characterized in that, The anti-clogging air blowing device (600) includes an annular air chamber opened between the nozzle seat and the rotating sleeve. The annular air chamber is connected to a high-pressure compressed air source. The outer wall of the rotating sleeve is evenly opened with several blowing holes along the circumference.

8. The multi-angle carbon injection device for an electric arc furnace according to claim 7, characterized in that, The cylindrical base (101) is internally provided with a self-lubricating mechanism (700). The self-lubricating mechanism (700) includes a sealing plate (701) fixed to the inner wall of the cylindrical base (101). The surface of the sealing plate (701) is respectively provided with a first through hole and a second through hole for the output shaft (104) and the connecting shaft (106) to rotate. The self-lubricating mechanism (700) also includes an arc-shaped oil reservoir (702) fixed to the bottom wall of the cylindrical base (101). The inner top wall of the arc-shaped oil storage box (702) is provided with a filling pipe extending to the outer surface of the cylindrical seat (101), and a sealing plug is provided at the top of the filling pipe. Lubricating oil is added to the inside of the arc-shaped oil storage box (702) through the filling pipe. A lubrication pipe (703) extending to the upper surface of the sealing plate (701) is provided at the bottom of the arc-shaped oil storage box (702). A drip head corresponding to the tooth groove of the driven toothed disc (107) is provided at the top of the lubrication pipe (703).

9. A multi-angle carbon injection device for an electric arc furnace according to claim 8, characterized in that, The self-lubricating mechanism (700) also includes a reciprocating threaded column (704) fixed at the bottom of the connecting shaft (106). The outer surface of the reciprocating threaded column (704) is threadedly connected to a lifting plate (705). The inner bottom wall of the cylindrical seat (101) is fixedly provided with a pressure cylinder (706). The inner wall of the pressure cylinder (706) is slidably provided with a piston plate (707). The top of the piston plate (707) is fixedly provided with a connecting rod (708) extending to the top of the pressure cylinder (706). The top of the pressure cylinder (706) is provided with a sliding hole for the connecting rod (708) to slide. The top end of the connecting rod (708) is fixedly connected to the lower surface of the lifting plate (705). The inner bottom wall of the cylindrical seat (101) is fixedly provided with two limiting rods (709). The surface of the lifting plate (705) is provided with a limiting hole that is slidably connected to the surface of the two limiting rods (709).

10. A multi-angle carbon injection device for an electric arc furnace according to claim 9, characterized in that, The bottom outer surface of the pressure cylinder (706) is provided with an air intake pipe (7010) and a pressure pipe (7011). The end of the air intake pipe (7010) is provided with a mesh filter cover. The other end of the pressure pipe (7011) extends to the inner top of the arc-shaped oil storage box (702). The surfaces of the air intake pipe (7010) and the pressure pipe (7011) are respectively provided with an air intake check valve and a pressure check valve.

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