Automatic sampling device for slag outlet of electric arc furnace

Abstract

The present invention relates to the technical field of sampling devices, and specifically to an automatic sampling device for an arc furnace slag outlet, comprising: an arc furnace, a guide trough, a fixed plate, a sampling device and a driving mechanism, wherein the guide trough is connected to the arc furnace slag outlet, the fixed plate is arranged on the guide trough, a mounting hole is opened on the fixed plate, the sampling device is arranged on the fixed plate, and the sampling device is located on a vertical plane at the center line position of the guide trough, the driving mechanism is arranged in the through hole, and the driving mechanism is arranged on one side of the sampling device, so as to solve the problem of low safety and large error in manual sampling.

Description

Technical Field

[0001] The invention relates to the technical field of sampling devices, in particular to an automatic sampling device for a slag outlet of an electric arc furnace. Background Art

[0002] In the metallurgical process, electric arc furnaces produce high-temperature liquid slag during the production process, usually at a temperature of 1400℃ to 1600℃. In order to ensure stable production and optimize the smelting process, timely monitoring of the composition of the liquid slag is crucial. However, conventional sampling methods face multiple challenges in high-temperature environments. In the current conventional sampling process, samplers will select representative samples from the steel slag for sampling. When sampling, samplers will use sampling tools (such as sampling spoons) to take out an appropriate amount of samples from the steel slag. However, this method requires the operator to be in close contact with the slag discharge port or the diversion trough area. The high-temperature slag and furnace environment pose a huge threat to personnel safety. At the same time, manual operation will be affected by the operator's experience and manual operation errors, resulting in unstable sample composition, which is difficult to meet the high-precision requirements of production for sample data;

[0003] In the existing technology, such as the content titled "Research on Safety and Accuracy Issues of Manual Sampling of Slag in the Smelting Process" in "Metallurgical Engineering" or "Challenges and Automated Solutions of Manual Sampling of Slag in High-Temperature Environments" in "Iron and Steel Metallurgy", it is pointed out that operators need to be close to the high-temperature slag discharge port, which is prone to risks such as burns and electric shocks. It is also easy to produce sampling errors, affecting the precise control of the smelting process and thus affecting the quality of the steel. Summary of the invention

[0004] The object of the present invention is to provide an automatic sampling device for a slag outlet of an electric arc furnace, so as to solve the problem of low safety and large error in manual sampling proposed in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an automatic sampling device for a slag outlet of an electric arc furnace, comprising:

[0006] A guide trough connected to a slag outlet of the electric arc furnace;

[0007] A fixing plate, arranged on the guide groove, and a mounting hole is provided on the fixing plate;

[0008] A sampling device is arranged on the fixing plate, and the sampling device is located on a vertical plane at the centerline of the guide groove;

[0009] A driving mechanism is disposed in the through hole, and the driving mechanism is disposed on one side of the sampling device;

[0010] The sampling device comprises:

[0011] An outer sleeve is inserted into the mounting hole, a first-level feed port is provided at the bottom of the outer wall of the outer sleeve, and a first-level drive port is provided at the top of the outer wall of the outer sleeve;

[0012] A sampling tube is inserted into the inner cavity of the outer sleeve, a secondary feed port is provided at the bottom end of the outer wall of the sampling tube, and a secondary drive groove is provided at the top end of the outer wall of the sampling tube;

[0013] A bracket, arranged above the mounting hole;

[0014] A first tension spring is disposed between the bracket and the outer sleeve;

[0015] A second tension spring is disposed between the bracket and the sampling tube;

[0016] A cooling component is arranged between the outer sleeve and the sampling tube.

[0017] Preferably, when the outer sleeve and the sampling tube move downward to the maximum limit, the primary feed port and the secondary feed port are at the same horizontal height.

[0018] Preferably, the sampling tube comprises:

[0019] The support section is a columnar structure, the support section is slidably disposed in the inner cavity of the outer sleeve, and the outer wall of the support section is provided with a through hole penetrating the bottom surface of the support section;

[0020] The sampling section is arranged on the bottom surface of the supporting section, and a heat conducting plate is arranged at the center position of the top surface of the sampling section. The top surface of the heat conducting plate corresponds to the through hole on the bottom surface of the supporting section, and the bottom surface of the heat conducting plate corresponds to the secondary feed port.

[0021] Preferably, the cooling assembly comprises:

[0022] A water inlet pipe, one end of which is arranged on the outer wall of the outer sleeve;

[0023] A water outlet pipe, one end of which is arranged on the outer wall of the outer sleeve and is located on the opposite side of the water inlet pipe;

[0024] a valve unit connected to the other end of the water inlet pipe;

[0025] A first drive tube is located in the through hole, one end of the first drive tube is connected to the heat conducting plate, and the other end of the first drive tube is connected to the valve unit;

[0026] A hydraulic cylinder is arranged on the support, and an output end of the hydraulic cylinder is connected to a top end of the support section;

[0027] a second drive pipe connected between the valve unit and the hydraulic cylinder;

[0028] A liquid medium is filled in the first driving tube and the second driving tube.

[0029] Preferably, the valve unit comprises:

[0030] A valve body, the water outlet end of the valve body being connected to the water inlet pipe;

[0031] A piston is slidably disposed in the inner cavity of the valve body, and a water delivery hole is opened on the outer wall of the piston;

[0032] The spring is arranged on one side of the piston, and the first drive tube and the second drive tube are connected to the valve body and are located on the other side of the piston.

[0033] Preferably, in an initial state, the primary feed port is located in the inner cavity of the outer sleeve, and the connection positions of the water inlet pipe and the water outlet pipe with the outer sleeve correspond to the position of the primary feed port.

[0034] Preferably, sealing members are provided between both ends of the sampling section and the outer sleeve.

[0035] Preferably, the liquid medium is a thermal expansion hydraulic medium.

[0036] The invention proposes an automatic sampling device for the slag outlet of an electric arc furnace, which has the following beneficial effects: the invention utilizes a driving mechanism to control the outer sleeve and the sampling tube to move downward one by one, and inserts the primary feed port and the secondary feed port into the molten slag liquid one by one. After the liquid slag fills the secondary feed port, the driving mechanism is used to control the sampling tube and the outer sleeve to move upward one by one, and at the same time the secondary feed port is moved to the inner cavity of the outer sleeve to complete the sampling. The operator does not need to be exposed to a high temperature environment, which effectively reduces the safety hazards brought by the high temperature environment. At the same time, the sampling position can be accurately located to ensure the representativeness and composition consistency of the sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the present invention;

[0038] Figure 2 It is a schematic diagram of the driving mechanism of the present invention;

[0039] Figure 3 It is a schematic diagram of the sampling device of the present invention;

[0040] Figure 4 It is a partial schematic diagram of the sampling device of the present invention;

[0041] Figure 5 This is a schematic diagram of the valve unit of the present invention;

[0042] Figure 6 It is a schematic diagram of the cooling assembly of the present invention.

[0043] In the figure: 1, guide groove, 2, fixing plate, 3, sampling device, 31, outer sleeve, 311, primary drive port, 312, primary feed port, 3211, support section, 3212, secondary drive groove, 3221, sampling section, 3222, secondary feed port, 323, heat conduction plate, 331, bracket, 332, support column, 34, first tension spring, 35, second tension spring, 36, cooling component, 361, water inlet pipe, 362, water outlet pipe, 363, valve unit, 3631, valve body, 3632, piston, 3633, spring, 3634, water delivery hole, 364, first drive pipe, 365, hydraulic cylinder, 366, second drive pipe, 367, liquid medium, 4, drive mechanism, 41, base, 42, power push block, 43, temperature conduction rod. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] See also Figure 1-6 The present invention provides a technical solution for an automatic sampling device at a slag outlet of an electric arc furnace. The detailed connection means are well-known technologies in the art. The following mainly introduces the working principle and process. The specific operations are as follows.

[0046] An automatic sampling device for a slag outlet of an electric arc furnace comprises: an electric arc furnace, a guide trough 1, a fixing plate 2, a sampling device 3 and a driving mechanism 4.

[0047] The electric arc furnace is used to heat and melt metal to produce high-temperature liquid slag, which is discharged through the slag outlet and sampled. The guide trough 1 is connected to the slag outlet of the electric arc furnace to guide the high-temperature liquid slag from the slag outlet to the slag pot or other containers. High-temperature resistant and corrosion-resistant materials, such as refractory bricks or ceramic materials, are used to ensure that they can withstand the high temperature and chemical corrosion of the slag. The fixed plate 2 is arranged on the guide trough 1 to provide a stable fixed position for the sampling device 3. A mounting hole is opened on the fixed plate 2, and the mounting hole is located on the vertical middle surface of the guide trough 1 to ensure that the sampling device 3 obtains an accurate slag sample, and ensures the representativeness of the sample and the consistency of the sampling. A detachable connection is adopted between the fixed plate 2 and the guide trough 1, which is convenient for adjusting the sampling position. The sampling device 3 is arranged on the fixed plate 2, and the sampling device 3 is located on the vertical plane of the centerline position of the guide trough 1, ensuring that the sampling point is in the center of the slag flow to collect representative samples. This arrangement makes the sampling process unaffected by changes in the slag flow rate, enhances the accuracy of sampling, and can maintain the consistency of sample composition in a stable slag flow environment. The driving mechanism 4 is arranged in the through hole, and the driving mechanism 4 is arranged on one side of the sampling device 3. The driving mechanism 4 is used to control the up and down movement of the sampling tube to realize sampling and retrieval operations.

[0048] The sampling device 3 includes: an outer sleeve 31 , a sampling tube, a bracket 331 , a first tension spring 34 , a second tension spring 35 and a cooling assembly 36 .

[0049] The outer sleeve 31 is inserted into the mounting hole as the external protection structure of the sampling tube. The outer wall bottom of the outer sleeve 31 is provided with a first-level feed port 312 for controlling the slag to flow into the sampling tube. The outer wall top of the outer sleeve 31 is provided with a first-level drive port 311 for realizing the upward and downward movement of the outer sleeve 31 by external force. The material of the outer sleeve 31 should be resistant to high temperature and corrosion to withstand the high temperature scouring and chemical erosion of the slag. The bottom end of the outer sleeve 31 is an open structure, and the sampling tube is inserted into the outer sleeve. The inner cavity 31 is used to actually collect the slag sample. The bottom end of the outer wall of the sampling tube is provided with a secondary feed port 3222. The secondary feed port 3222 at the bottom end of the outer wall cooperates with the primary feed port 312 to control the inflow of the sample. The top end of the outer wall of the sampling tube is provided with a secondary drive groove 3212. The secondary drive groove 3212 at the top cooperates with the drive mechanism 4 to adjust the position of the sampling tube to control the sampling depth and flow rate. The bracket 331 is arranged above the mounting hole. The bracket 331 is fixed to the mounting hole. The plates 2 are connected by a plurality of support columns 332 to ensure the stability of the bracket 331. The bracket 331 and the support columns 332 are detachably connected. The first tension spring 34 is arranged between the bracket 331 and the outer sleeve 31, and is used to reset the outer sleeve 31 after sampling is completed to ensure that the device remains closed in a non-working state. The second tension spring 35 is arranged between the bracket 331 and the sampling tube to control the resetting of the sampling tube. The tension spring design enables the outer sleeve 31 and the sampling tube to maintain a predetermined position in a high-temperature environment, which helps to reduce the loss of the sampling assembly due to high temperature. The cooling assembly 36 is arranged on the outer sleeve 31 and the sampling tube, and is used to cool the high-temperature slag in the secondary feed port 3222. When the outer sleeve 31 and the sampling tube are in the initial state, that is, when the outer sleeve 31 and the sampling tube are not driven by the driving mechanism 4, the first tension spring 34 and the second tension spring 35 are in a contracted state, the primary feed port 312 is in the inner cavity of the outer sleeve 31, and the cooling assembly 36 is in a non-working state.

[0050] When the outer sleeve 31 and the sampling tube move down to the maximum limit, the primary feed port 312 and the secondary feed port 3222 are at the same horizontal height. At the same time, the primary feed port 312 and the secondary feed port 3222 are inserted into the guide groove 1 to reach the depth of the middle area through which the slag flows, avoiding collecting only the slag components on the surface or bottom layer to ensure that a representative slag sample is collected. At the same time, under the drive of the driving mechanism 4, the outer sleeve 31 first moves to the predetermined area, and then the inner sleeve moves to the predetermined area for sampling, avoiding collecting samples on the surface of the slag.

[0051] The sampling tube includes: a supporting section 3211 , a sampling section 3221 and a heat conducting plate 323 .

[0052] The support section 3211 is a columnar structure, and the support section 3211 is slidably arranged in the inner cavity of the outer sleeve 31. The outer wall of the support section 3211 is provided with a through hole that penetrates to the bottom surface of the support section 3211, so that the support section 3211 can move up and down along the inner wall of the outer sleeve 31, which is convenient for adjusting the sampling position. One end of the through hole is provided on the arc-shaped outer wall of the support section 3211, and the other end of the through hole is provided on the bottom surface of the support section 3211. At the same time, a through hole is provided on the annular outer wall of the outer sleeve 31. Corresponding auxiliary holes, the sampling section 3221 is arranged on the bottom surface of the supporting section 3211, and the two ends of the sampling section 3221 are sealed from the outer sleeve 31. A heat conducting plate 323 is arranged at the center of the top surface of the sampling section 3221, and the top surface of the heat conducting plate 323 corresponds to the bottom through hole of the supporting section 3211, and the bottom surface of the heat conducting plate 323 corresponds to the secondary feed port 3222. When the secondary feed port 3222 is filled with slag sample, the temperature of the slag will be transferred through the heat conducting plate 323.

[0053] The cooling assembly 36 includes: a water inlet pipe 361 , a water outlet pipe 362 , a valve unit 363 , a first drive pipe 364 , a hydraulic cylinder 365 , a second drive pipe 366 and a liquid medium 367 .

[0054] One end of the water inlet pipe 361 is arranged on the outer wall of the outer sleeve 31, and one end of the water outlet pipe 362 is arranged on the outer wall of the outer sleeve 31 and is located on the opposite side of the water inlet pipe 361. When the device is in working state, the sampling section 3221 is located between the water inlet pipe 361 and the water outlet pipe 362. The cooling water flows through the water inlet pipe 361, the secondary feed port 3222 and the water outlet pipe 362. The cooling water cools the slag in the secondary feed port 3222 when passing through the slag. The generated steam and The liquid will be discharged from the outlet pipe 362, and the outlet pipe 362 can be connected to the cooling water circulation system to re-cool the cooled water and steam for recycling, which is suitable for large-scale industrial facilities, effectively saving water resources and reducing the consumption of cooling water. The valve unit 363 is connected to the other end of the water inlet pipe 361, and the valve unit 363 is connected to the external cooling water source, and enters the secondary feed port 3222 through the valve unit 363 and the water inlet pipe 361. The valve unit 363 reaches the condition. The passage is maintained when the components are connected to achieve a cooling effect. The first drive pipe 364 is located in the through hole, and one end of the first drive pipe 364 is connected to the heat conducting plate 323, and the other end of the first drive pipe 364 is connected to the valve unit 363. The appropriate temperature is transferred to the liquid medium 367 in the first drive pipe 364 through the heat conducting plate 323. The hydraulic cylinder 365 is arranged on the bracket 331, and the output end of the hydraulic cylinder 365 is connected to the top of the support section 3211. When the support section 3211 moves, the output end of the hydraulic cylinder 365 can be squeezed or stretched, thereby changing the pressure of the liquid in the hydraulic cylinder 365. The second drive pipe 366 is connected between the valve unit 363 and the hydraulic cylinder 365. When the output end of the hydraulic cylinder 365 is squeezed into the cylinder body, the hydraulic liquid in the hydraulic cylinder 365 will be transported to the valve unit 363 through the second drive pipe 366, and the liquid medium 367 is filled in the first drive pipe 364 and the second drive pipe 366.

[0055] The valve unit 363 includes a valve body 3631 , a piston 3632 and a spring 3633 .

[0056] The water outlet end of the valve body 3631 is connected to the water inlet pipe 361. The valve body 3631 is a cylindrical cavity structure. The water inlet end and the water outlet end of the valve body 3631 are respectively arranged on the outer wall of the arc rod of the valve body 3631, and are arranged oppositely. The water outlet end of the valve body 3631 is connected to the water inlet pipe 361, and the water inlet end of the valve body 3631 is connected to an external cooling water source. The piston 3632 is slidably arranged in the inner cavity of the valve body 3631. The outer wall of the piston 3632 is provided with a water delivery hole 3634. The piston 3632 moves along the axial direction of the valve body 3631. When the piston 3632 moves to the point where the water delivery hole 3634 is connected to the water inlet end and the water outlet end of the valve body 3631, When the water ends are at the same axial position, the water path is in an open state, the spring 3633 is arranged on one side of the piston 3632, the first drive tube 364 and the second drive tube 366 are connected to the valve body 3631 and are located on the other side of the piston 3632. When the open state is not reached, the spring 3633 pushes the piston 3632 away from the spring 3633, so that the water delivery hole 3634 and the water inlet and outlet ends of the valve body 3631 are not on the same axis, so that the water path remains closed. The elastic coefficient of the spring 3633 is accurately calculated to provide appropriate reset force to ensure the stability of the piston 3632 action and the rapid response of the valve unit 363.

[0057] In the initial state, the primary feed port 312 is located in the inner cavity of the outer sleeve 31 , and the connection positions of the water inlet pipe 361 and the water outlet pipe 362 with the outer sleeve 31 correspond to the position of the primary feed port 312 .

[0058] Seals are provided between the two ends of the sampling section 3221 and the outer sleeve 31 to ensure the flow of cooling water when the secondary feed port 3222 moves between the water inlet pipe 361 and the water outlet pipe 362 .

[0059] The liquid medium 367 is a heat expansion hydraulic medium with a high expansion coefficient, and can produce a significant volume change when the temperature changes. When the heat is transferred to the first drive tube 364 via the heat conducting plate 323, the volume of the liquid medium 367 increases, compressing the piston 3632, and the piston 3632 moves in the direction of the spring 3633. When the piston 3632 is pushed only by the liquid medium 367 in the first drive tube 364, the water delivery hole 3634 is not on the same axis as the water inlet and outlet ends of the valve body 3631, and the water circuit is closed. When the liquid medium 367 in the first drive tube 364 does not change in volume, the sampling tube When it moves to the maximum limit position toward the bracket 331 under the action of the second tension spring 35, pressure is accumulated on the output end of the hydraulic cylinder 365, and the hydraulic liquid in the hydraulic cylinder 365, that is, the liquid medium 367, is compressed out of the hydraulic cylinder 365 and transported to the valve body 3631 through the second drive pipe 366. The piston 3632 is only pushed by the liquid medium 367 in the second drive pipe 366, and the water delivery hole 3634 is not on the same axis as the water inlet and outlet ends of the valve body 3631, and the water path is closed. When the two act at the same time, the water delivery hole 3634 is on the same axis as the water inlet and outlet ends of the valve body 3631, and the water path is opened.

[0060] The driving mechanism 4 includes a base 41 , a power push block 42 and a temperature conducting rod 43 .

[0061] The base 41 is mounted on the fixed plate 2 and is located on one side of the outer sleeve 31. The power push block 42 is mounted on the top side wall of the base 41. The power push block 42 moves radially along the outer sleeve 31 and corresponds to the primary drive port 311 and the secondary drive slot 3212. The heat conducting rod 43 is arranged at the bottom end of the base 41, and the working area of ​​the heat conducting rod 43 is located in the main flow area of ​​the slag. The bottom end of the heat conducting rod 43 is located at a position close to the slag outlet, so that when the temperature changes upstream of the slag, the sampling tube and the outer sleeve 31 are at a non-sampling temperature, and the reset is performed. The thermal hydraulic or pneumatic system can be installed between the base 41 and the power push block 42, and the heat is transferred to the liquid or gas inside the system through the heat conducting rod. When the temperature is within the predetermined range, the liquid or gas expands to generate pressure, pushing the power push block 42 to the sampling position. When the temperature drops, the liquid or gas contracts, the pressure decreases, and the power push block 42 is automatically retracted under the action of the elastic member. The elastic member is installed between the back side of the power push block 42 and the base 41 to provide the necessary resetting elastic force to ensure that the power push block 42 can be quickly reset when the temperature drops. This thermal-sensitive hydraulic or pneumatic system can automatically respond to temperature changes and control the action of the power push block 42 by expansion and contraction, and has reliability and stability in high-temperature environments. At the same time, the design realizes automatic operation without complex electronic components and is suitable for high-temperature industrial applications. At the same time, a thermal expansion controller and a pressure relief valve are set on the base 41. When the system temperature rises and reaches a predetermined range, the thermal expansion controller will drive the pressure relief valve to release pressure. Under the action of the elastic member, the power push block 42 is reset, wherein the thermal-sensitive hydraulic, pneumatic system, thermal expansion controller and pressure relief valve are not shown in the figure.

[0062] The power push block 42 and the secondary drive groove 3212 are both designed as triangular structures. When the power push block 42 moves toward the outer sleeve 31, it first contacts the primary drive port 311. The outer sleeve 31 moves downward to the desired position along with the movement of the power push block 42. Then the power push block 42 continues to move, contacts the secondary drive groove 3212, and pushes the sampling tube downward until the primary feed port 312 and the secondary feed port 3222 coincide with each other.

[0063] Working principle:

[0064] When the slag of the electric arc furnace flows into the guide groove 1 through the slag outlet, it first contacts the heat-conducting rod. When the temperature reaches the normal temperature range of the slag, the power push block 42 is pushed out by heat control. The power push block 42 first contacts the primary drive port 311, driving the outer sleeve 31 to move in the direction of the guide groove 1 until it moves to the middle area of ​​the slag. At this time, the slag flows through the primary feed port 312, continues to move with the power push block 42 and contacts the secondary drive groove 3212, driving the sampling tube to the guide groove 1. The first and second drive slots 3212 and 3213 are connected to each other by the outer sleeve 31 and the sampling tube 331. The first and second drive slots 3212 and 3213 are connected to each other by the outer sleeve 31 and the sampling tube 331. The first and second drive slots 3212 and 3213 are connected to each other by the outer sleeve 31 and the sampling tube 331. The first and second drive slots 3212 and 3213 are connected to each other by the outer sleeve 31 and the sampling tube 331. The first and second drive slots 3212 and 3213 are connected to each other by the outer sleeve 31 and the sampling tube 331. Corresponding to the water outlet pipe 362, when the sampling tube moves to the initial state, the output end of the extrusion hydraulic cylinder 365 is used to squeeze the liquid in the hydraulic cylinder 365, and the liquid medium 367 in the second drive pipe 366 is squeezed to move the piston 3632. At this time, the valve unit 363 is in a closed state. At the same time, the heat of the slag in the secondary feed port 3222 is transferred to the second drive pipe 366 through the heat conduction plate 323. The liquid medium 367 in the second drive pipe 366 is heated and expanded, and the drive unit 363 moves. Plug 3632 moves again, and at this time valve unit 363 is in an open state, cooling water will flow through the slag to cool it down, and the cooled liquid and gas will be discharged from the outlet pipe 362. When the slag temperature drops, the volume of the liquid medium 367 in the second drive tube 366 decreases, the piston 3632 moves in the opposite direction, and the valve unit 363 is in a closed state to complete the cooling. When the arc furnace completes the slag dumping, the bracket 331 can be removed, the sampling tube can be taken out of the outer sleeve 31, the slag sample can be taken out, and the sampling is completed.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic sampling device for an electric arc furnace slag outlet, characterized in that: include: A guide trough (1) connected to a slag outlet of the electric arc furnace; A fixing plate (2) is arranged on the guide groove (1), and a mounting hole is provided on the fixing plate (2); A sampling device (3) is arranged on the fixing plate (2), and the sampling device (3) is located on a vertical plane at the midline position of the guide groove (1); A driving mechanism (4) is arranged in the through hole, and the driving mechanism (4) is arranged on one side of the sampling device (3); The sampling device (3) comprises: An outer sleeve (31) is inserted into the mounting hole, a primary feed port (312) is provided at the bottom end of the outer wall of the outer sleeve (31), and a primary drive port (311) is provided at the top end of the outer wall of the outer sleeve (31); A sampling tube is inserted into the inner cavity of the outer sleeve (31), a secondary feed port (3222) is provided at the bottom end of the outer wall of the sampling tube, and a secondary drive groove (3212) is provided at the top end of the outer wall of the sampling tube; A bracket (331) is arranged above the mounting hole; A first tension spring (34) is disposed between the bracket (331) and the outer sleeve (31); A second tension spring (35) is disposed between the bracket (331) and the sampling tube; A cooling assembly (36) is arranged between the outer sleeve (31) and the sampling tube.

2. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 1, characterized in that: When the outer sleeve (31) and the sampling tube move downward to the maximum limit position, the primary feed port (312) and the secondary feed port (3222) are at the same level.

3. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 1, characterized in that: The sampling tube comprises: The support section (3211) is a columnar structure, and the support section (3211) is slidably disposed in the inner cavity of the outer sleeve (31), and the outer wall of the support section (3211) is provided with a through hole penetrating the bottom surface of the support section (3211); The sampling section (3221) is arranged on the bottom surface of the supporting section (3211), and a heat conducting plate (323) is arranged at the center position of the top surface of the sampling section (3221), the top surface of the heat conducting plate (323) corresponds to the bottom surface through hole of the supporting section (3211), and the bottom surface of the heat conducting plate (323) corresponds to the secondary feed port (3222).

4. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 3, characterized in that: The cooling assembly (36) comprises: a water inlet pipe (361), one end of the water inlet pipe (361) being arranged on the outer wall of the outer sleeve (31); a water outlet pipe (362), one end of the water outlet pipe (362) being arranged on the outer wall of the outer sleeve (31) and being located on the opposite side of the water inlet pipe (361); A valve unit (363), wherein the valve unit (363) is connected to the other end of the water inlet pipe (361); A first drive tube (364) is located in the through hole, and one end of the first drive tube (364) is connected to the heat conducting plate (323), and the other end of the first drive tube (364) is connected to the valve unit (363); A hydraulic cylinder (365) is arranged on the support (331), and an output end of the hydraulic cylinder (365) is connected to a top end of the support section (3211); a second drive pipe (366), the second drive pipe (366) being connected between the valve unit (363) and the hydraulic cylinder (365); The liquid medium (367) is filled in the first driving tube (364) and the second driving tube (366).

5. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 4, characterized in that: The valve unit (363) comprises: A valve body (3631), wherein a water outlet end of the valve body (3631) is connected to the water inlet pipe (361); A piston (3632) is slidably disposed in the inner cavity of the valve body (3631), and a water delivery hole (3634) is formed on the outer wall of the piston (3632); The spring (3633) is disposed on one side of the piston (3632), and the first drive tube (364) and the second drive tube (366) are connected to the valve body (3631) and are located on the other side of the piston (3632).

6. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 4, characterized in that: In the initial state, the primary feed port (312) is located in the inner cavity of the outer sleeve (31), and the connection positions of the water inlet pipe (361) and the water outlet pipe (362) with the outer sleeve (31) correspond to the position of the primary feed port (312).

7. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 3, characterized in that: Sealing members are provided between the two ends of the sampling section (3221) and the outer sleeve (31).

8. The automatic sampling device for the slag outlet of an electric arc furnace according to claim 4, characterized in that: The liquid medium (367) is a thermal expansion hydraulic medium.

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