Counter weight type check valve for feeding pipe of metallurgical submerged arc furnace

Abstract

The utility model discloses a heavy hammer type check valve for a feeding pipe of a metallurgical submerged arc furnace, which comprises a feeding pipeline, a valve body inner pipe sleeved at the bottom of the feeding pipeline, a peripheral pipe sleeved at the periphery of the bottom of the valve body inner pipe, a cover plate assembly arranged at the bottom of the valve body inner pipe, a blanking pipe sleeved at the bottom of the peripheral pipe, and a furnace feeding pipe sleeved at the bottom of the blanking pipe. The bottom of the in-furnace material pipe extends into the furnace cover, and the axes of the feeding pipeline, the valve body inner pipe, the discharging pipe and the in-furnace material pipe are located on the same straight line. The feeding pipeline structure solves the problems that an existing feeding pipeline structure is prone to smoke leakage, smoke escapes, and reliability is low.

Description

TECHNICAL FIELD

[0001] The utility model belongs to metallurgical furnace equipment technical field, concretely relates to the heavy hammer type check valve for the feeding pipe of metallurgical furnace. BACKGROUND

[0002] Metallurgical furnace is in smelting process, is to join the ore and reducing agent (coal, petroleum coke etc.) into the hearth, to produce electric arc between electrodes, make the mixture material burn. In the smelting process, a large amount of heat and flue gas will be generated, due to the micro negative pressure of the hearth, the mixture material burns a large amount of flue gas, a large amount of hot flue gas is discharged from the flue arranged at the top of the smoke hood, enters the dust collector, and after filtering dust and harmful substances in the dust collector, is discharged into the atmosphere through the exhaust pipe. The top of the smoke hood is also provided with a feeding pipe, and the lower end of the feeding pipe is connected to a discharge pipe. In the smelting process, the furnace needs to be frequently fed, and the mixed material is added to the discharge pipe from the feeding pipe. The discharge pipe is connected to the material pipe in the furnace.

[0003] In the normal production process, due to the high temperature in the furnace, the high-temperature flue gas generated is easy to rise from the material pipe in the furnace into the discharge pipe. The discharge pipe is roasted by a large amount of flame, and at the same time, part of the high-temperature flue gas with sparks will enter the feeding pipe from the discharge pipe. The high-temperature flue gas escapes from the feeding pipe and rises into the feeding system at the top of the electric furnace equipment. The raw materials for electric furnace smelting are easy to catch fire, which may cause safety accidents and increase the risk of operation.

[0004] The prior art usually sets a gas sealing device at the upper end of the discharge pipe. The gas sealing device is directly inserted into the discharge pipe by a branch pipe, forming an air injection structure. The branch pipe is blown into the discharge pipe by an induced draft fan as an air source, and then enters the discharge pipe, finally reaching the inside of the smelting electric furnace. The flue gas generated in the production process of the electric furnace will not be discharged from the discharge pipe. However, the discharge pipe with this structure is easy to burn out, resulting in flue gas escaping, and the reliability is greatly reduced. At the same time, the operation cost is also increased. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a heavy hammer type check valve for the feeding pipe of a metallurgical furnace, which solves the problems of easy smoke leakage, flue gas escaping and low reliability of the existing feeding pipe structure.

[0006] The utility model adopts the technical scheme that the heavy hammer type check valve for the feeding pipe of a metallurgical furnace comprises a feeding pipe, a valve body inner pipe is sleeved at the bottom of the feeding pipe, an outer peripheral pipe is sleeved at the outer periphery of the bottom of the valve body inner pipe, a cover plate assembly is arranged at the bottom of the valve body inner pipe, a discharge pipe is sleeved at the bottom of the outer peripheral pipe, a material pipe in the furnace is sleeved at the bottom of the discharge pipe, the bottom of the material pipe in the furnace extends into a furnace cover, and the axes of the feeding pipe, the valve body inner pipe, the discharge pipe and the material pipe in the furnace are in the same straight line.

[0007] The utility model is characterized in that,

[0008] The cross section of the peripheral tube is in a "U" shape structure, and a side plate is arranged at one end of the opening of the "U" shape structure in the longitudinal direction of the peripheral tube 7, and the side plate is used for sealing the opening of the "U" shape structure and is airtightly welded with the "U" shape structure.

[0009] A through hole is oppositely arranged on the upper part of the peripheral tube and away from one side of the "U" shape bending part in the radial direction, a sliding sleeve is sleeved in the through hole, the sliding sleeves on both sides of the peripheral tube are concentric, a stop washer is elastically embedded in the sliding sleeve, a valve shaft is sleeved between the two stop washers, the valve shaft and the sliding sleeve are fixed together by the stop washers, and the valve shaft penetrates and extends out of the outer side of the peripheral tube.

[0010] The cover plate assembly comprises a valve plate, one end of the valve plate is fixedly connected with the valve shaft, the bottom of the valve body inner tube is a chamfered surface, the valve plate completely covers the chamfered surface of the bottom of the valve body inner tube, and the upper surface of the valve plate is tightly sealed and abuts against the bottom of the valve body inner tube.

[0011] One end of the valve shaft extending out of the peripheral tube is fixed with a balance lever through bolts, and a weight block is fixedly arranged on the balance lever through a nut.

[0012] A top plate is arranged on the upper surface of the peripheral tube, a bottom plate is arranged on the bottom of the peripheral tube, the peripheral tube is respectively sealed and connected with the valve body inner tube and the feeding pipe through the top plate and the bottom plate, a feeding hole is arranged at the center position of the top plate and the bottom plate, and the feeding hole adopts concentric circles of the valve body inner tube and the feeding pipe located on the same axis.

[0013] A flange is arranged at the top end of the valve body inner tube, a flange is welded at the bottom of the feeding pipe, the flanges on the valve body inner tube and the feeding pipe are connected through bolts, a flange is welded at the bottom of the feeding pipe, a flange is arranged at the top end of the in-furnace pipe, and the flanges on the feeding pipe and the in-furnace pipe are connected through bolts.

[0014] The valve body inner tube, the valve plate and the peripheral tube are all made of steel plate.

[0015] The utility model discloses a check valve for feeding pipe in metallurgical electric arc furnace, and the valve shaft drives the valve plate to realize the end face of the valve body inner tube, guarantees the overall airtightness of the pipeline, prevents smoke overflow, and has the characteristics of simple structure, safety and environmental protection and easy maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure diagram of the weight type check valve for the feeding pipe of the metallurgical electric arc furnace.

[0017] Figure 2 It is the top view of the weight type check valve for the feeding pipe of the metallurgical electric arc furnace.

[0018] In the figure, 1. feeding pipe, 2. flange, 3. top plate, 4. valve body side plate, 5. valve body inner pipe, 6. valve plate, 7. peripheral pipe, 8. bottom plate, 9. discharging pipe, 10. furnace inner pipe, 11. sliding bushing, 12. retaining ring, 13. valve shaft, 14. bolt, 15. weight block, 16. nut, 17. balance bar, 18. furnace cover. DETAILED DESCRIPTION

[0019] The utility model is in detail below in combination with the drawings and specific embodiment.

[0020] Example 1

[0021] The utility model is used for the gravity type check valve of feeding pipe of metallurgical electric arc furnace, and the structure is as shown in Figure 1 The utility model discloses a gravity type check valve of feeding pipe of metallurgical electric arc furnace, which comprises a feeding pipe 1, the bottom of the feeding pipe 1 is sleeved with a valve body inner pipe 5, the bottom of the valve body inner pipe 5 is peripherally sleeved with a peripheral pipe 7, the bottom of the valve body inner pipe 5 is provided with a cover plate assembly, the bottom of the peripheral pipe 7 is sleeved with a discharging pipe 9, the bottom of the discharging pipe 9 is sleeved with a furnace inner pipe 10, the bottom of the furnace inner pipe 10 extends into a furnace cover 18, and the axial lines of the feeding pipe 1, the valve body inner pipe 5, the discharging pipe 9 and the furnace inner pipe 10 are in the same straight line.

[0022] Example 2

[0023] The utility model discloses a gravity type check valve of feeding pipe of metallurgical electric arc furnace, which comprises a feeding pipe 1, the bottom of the feeding pipe 1 is sleeved with a valve body inner pipe 5, the bottom of the valve body inner pipe 5 is peripherally sleeved with a peripheral pipe 7, the bottom of the valve body inner pipe 5 is provided with a cover plate assembly, the bottom of the peripheral pipe 7 is sleeved with a discharging pipe 9, the bottom of the discharging pipe 9 is sleeved with a furnace inner pipe 10, the bottom of the furnace inner pipe 10 extends into a furnace cover 18, and the axial lines of the feeding pipe 1, the valve body inner pipe 5, the discharging pipe 9 and the furnace inner pipe 10 are in the same straight line. On the basis of example 1, the cross section of the peripheral pipe 7 of the utility model is in " U " shape structure, the side plate 4 is arranged at the opening end of the " U " shape structure in the longitudinal direction of the peripheral pipe 7, the side plate 4 is in " U " shape structure seal, and the side plate 4 is in airtightness welding with the " U " shape structure, a through hole is formed in the upper part of the peripheral pipe 7 and away from the side of the " U " shape bending part, the sliding bushing 11 is sleeved in the through hole, the sliding bushings 11 on the two sides of the peripheral pipe 7 are concentric, the retaining ring elasticity 12 is embedded in the inside of the sliding bushing 11, the valve shaft 13 is sleeved between the two retaining ring elasticities 12, the valve shaft 13 and the sliding bushing 11 are fixed together by the retaining ring 12, and the valve shaft 13 penetrates and extends out of the outside of the peripheral pipe 7.

[0024] Example 3

[0025] The utility model is heavy hammer type check valve for the feeding pipe of metallurgical submerged arc furnace, including feeding pipeline 1, the bottom of feeding pipeline 1 is sleeved with valve body inner tube 5, the bottom of valve body inner tube 5 is sleeved with peripheral tube 7, the bottom of valve body inner tube 5 is provided with cover plate assembly, the bottom of peripheral tube 7 is sleeved with lower outlet pipe 9, the bottom of lower outlet pipe 9 is sleeved with furnace inner material pipe 10, the bottom of furnace inner material pipe 10 extends into furnace cover 18, the axis of feeding pipeline 1, valve body inner tube 5, lower outlet pipe 9 and furnace inner material pipe 10 is in same straight line. The cross section of peripheral tube 7 is "U" letter shape structure, the longitudinal side of peripheral tube 7 is provided with side plate 4 at "U" letter shape structure opening end, side plate 4 is "U" letter shape structure seal, and is air-tightness welded with "U" letter shape structure, the upper part of peripheral tube 7 is provided with through hole away from the side of "U" letter shape bending part, is sleeved with sliding shaft sleeve 11 in the through hole, guarantees the concentricity of the both sides of peripheral tube 7 sliding shaft sleeve 11, sliding shaft sleeve 11 is embedded with baffle spring 12, valve shaft 13 is sleeved between two baffle spring 12, adopts baffle 12 to fix valve shaft 13 with sliding shaft sleeve 11, valve shaft 13 penetrates and extends outside peripheral tube 7. On the basis of embodiment 2, the cover plate assembly of the embodiment includes valve plate 6, one end of valve plate 6 is fixedly connected with valve shaft 13, the bottom of valve body inner tube 5 is chamfered, the area of valve plate 6 completely covers the chamfered surface of the bottom of valve body inner tube 5, the upper surface of valve plate 6 is tightly sealed with the bottom of valve body inner tube 5, as shown in Figure 2 Valve shaft 13 extends out one end of peripheral tube 7 and is fixed with balance lever 17 through bolt 14, and balance lever 17 is fixed with weight block 15 through nut 16.

[0026] Embodiment 4

[0027] The utility model is used for the weight type check valve of the feeding pipe of metallurgical electric arc furnace, including feeding pipeline 1, the bottom of feeding pipeline 1 is sleeved with valve body inner tube 5, the bottom of valve body inner tube 5 is sleeved with peripheral tube 7, the bottom of valve body inner tube 5 is provided with cover plate assembly, the bottom of peripheral tube 7 is sleeved with lower outlet pipe 9, the bottom of lower outlet pipe 9 is sleeved with furnace inner material pipe 10, the bottom of furnace inner material pipe 10 extends into furnace cover 18, the axis of feeding pipeline 1, valve body inner tube 5, lower outlet pipe 9 and furnace inner material pipe 10 is in same straight line. The cross section of peripheral tube 7 is "U" letter shape structure, the longitudinal side of peripheral tube 7 is provided with side plate 4 at "U" letter shape structure opening end, side plate 4 is "U" letter shape structure seal, and is air-tightness welded with "U" letter shape structure, the upper part of peripheral tube 7 is provided with through hole radially away from the side of "U" letter shape bending part, is sleeved with sliding shaft sleeve 11 in the through hole, guarantees that the sliding shaft sleeve 11 of both sides of peripheral tube 7 is concentric, sliding shaft sleeve 11 is embedded with baffle spring 12 inside, is sleeved with valve shaft 13 between two baffle spring 12, adopts baffle 12 to fix valve shaft 13 with sliding shaft sleeve 11, and valve shaft 13 penetrates and extends outside the lateral side of peripheral tube 7. Cover plate assembly includes valve plate 6, one end of valve plate 6 is fixedly connected with valve shaft 13, the bottom of valve body inner tube 5 is inclined surface, the area of valve plate 6 completely covers the inclined surface of the bottom of valve body inner tube 5, and the upper surface of valve plate 6 is sealed and is tightly attached to the bottom of valve body inner tube 5, one end of valve shaft 13 extending outside peripheral tube 7 is fixed with balance lever 17 through bolt 14, and balance lever 17 is fixedly provided with weight block 15 through nut 16. On the basis of embodiment 3, the upper surface of peripheral tube 7 of the utility model is provided with top plate 3, the bottom of peripheral tube 7 is provided with bottom plate 8, and peripheral tube 7 is sealedly connected with valve body inner tube 5 and lower outlet pipe 9 through top plate 3 and bottom plate 8 respectively, top plate 3 and bottom plate 8 are provided with feeding hole in the center position, and the feeding hole is provided with valve body inner tube 5 and lower outlet pipe 9 on the same axis concentric circle.

[0028] Embodiment 5

[0029] The utility model is used for the weight type check valve of the feeding pipe of metallurgical electric arc furnace, including feeding pipeline 1, the bottom of feeding pipeline 1 is sleeved with valve body inner tube 5, the bottom of valve body inner tube 5 is sleeved with peripheral tube 7, the bottom of valve body inner tube 5 is provided with cover plate assembly, the bottom of peripheral tube 7 is sleeved with downcomer 9, the bottom of downcomer 9 is sleeved with furnace inner material pipe 10, the bottom of furnace inner material pipe 10 extends into furnace cover 18, the axis of feeding pipeline 1, valve body inner tube 5, downcomer 9 and furnace inner material pipe 10 is in same straight line. The cross section of peripheral tube 7 is "U" letter shape structure, the longitudinal side of peripheral tube 7 is provided with side plate 4 at "U" letter shape structure opening end, side plate 4 is "U" letter shape structure seal, and is air-tightness welded with "U" letter shape structure, the upper part of peripheral tube 7 is provided with through hole on the side away from "U" letter shape bending part, the through hole is sleeved with sliding shaft sleeve 11, ensures that the both sides of peripheral tube 7 are concentric, sliding shaft sleeve 11 is embedded with stopper elastic 12, valve shaft 13 is sleeved between the two stopper elastics 12, stopper 12 is used to fix valve shaft 13 and sliding shaft sleeve 11 together, and valve shaft 13 penetrates and extends outside peripheral tube 7. Cover plate assembly includes valve plate 6, one end of valve plate 6 is fixedly connected with valve shaft 13, the bottom of valve body inner tube 5 is chamfered, the area of valve plate 6 completely covers the chamfered bottom of valve body inner tube 5, the upper surface of valve plate 6 is tightly sealed to the bottom of valve body inner tube 5, one end of valve shaft 13 extending outside peripheral tube 7 is fixed with balance lever 17 through bolt 14, and heavy weight block 15 is fixedly arranged on balance lever 17 through nut 16. The upper surface of peripheral tube 7 is provided with top plate 3, the bottom of peripheral tube 7 is provided with bottom plate 8, and peripheral tube 7 is respectively sealedly connected with valve body inner tube 5 and downcomer 9 through top plate 3 and bottom plate 8, and feeding hole is formed in the central position of top plate 3 and bottom plate 8. On the basis of embodiment 4, the top end of valve body inner tube 5 is provided with flange 2 in the embodiment, the bottom of feeding pipeline 1 is welded with flange 2, the flanges 2 on valve body inner tube 5 and feeding pipeline 1 are connected by bolt, the bottom of downcomer 9 is welded with flange 2, the top end of furnace inner material pipe 10 is provided with flange 2, and the flanges 2 on downcomer 9 and furnace inner material pipe 10 are connected by bolt, so that maintenance and replacement are convenient and fast.

[0030] EMBODIMENT 6

[0031] The utility model is used for the weight type check valve of the feeding pipe of metallurgical electric arc furnace, including feeding pipeline 1, the bottom of feeding pipeline 1 is sleeved with valve body inner tube 5, the bottom of valve body inner tube 5 is sleeved with peripheral tube 7, the bottom of valve body inner tube 5 is provided with cover plate assembly, the bottom of peripheral tube 7 is sleeved with downcomer 9, the bottom of downcomer 9 is sleeved with furnace inner material pipe 10, the bottom of furnace inner material pipe 10 extends into furnace cover 18, the axis of feeding pipeline 1, valve body inner tube 5, downcomer 9, furnace inner material pipe 10 is in same straight line. The cross section of peripheral tube 7 is "U" letter shape structure, the longitudinal side of peripheral tube 7 is provided with side plate 4 at "U" letter shape structure opening end, side plate 4 is "U" letter shape structure seal, and is air-tightness welded with "U" letter shape structure, the upper part of peripheral tube 7 is provided with through hole on the side away from "U" letter shape bending part, is sleeved with sliding shaft sleeve 11 in the through hole, guarantees that the both sides of peripheral tube 7 sliding shaft sleeve 11 is concentric, sliding shaft sleeve 11 is embedded with baffle spring 12, is sleeved with valve shaft 13 between two baffle spring 12, adopts baffle 12 to fix valve shaft 13 with sliding shaft sleeve 11, and valve shaft 13 penetrates and extends outside the lateral side of peripheral tube 7. Cover plate assembly includes valve plate 6, one end of valve plate 6 is fixedly connected with valve shaft 13, the bottom of valve body inner tube 5 is inclined surface, and the area of valve plate 6 completely covers the inclined surface of the bottom of valve body inner tube 5, and the upper surface of valve plate 6 is sealed and is tightly attached to the bottom of valve body inner tube 5, and one end of valve shaft 13 extending outside peripheral tube 7 is fixed with balance lever 17 through bolt 14, and balance lever 17 is fixed with weight block 15 through nut 16. The upper surface of peripheral tube 7 is provided with top plate 3, the bottom of peripheral tube 7 is provided with bottom plate 8, and peripheral tube 7 is sealedly connected with valve body inner tube 5 and downcomer 9 through top plate 3 and bottom plate 8 respectively, and feeding hole is set up in the central position of top plate 3 and bottom plate 8, and the feeding hole adopts the concentric circle of valve body inner tube 5 and downcomer 9 on same axis. The top of valve body inner tube 5 is provided with flange 2, the bottom of feeding pipeline 1 is welded with flange 2, and the flange 2 on valve body inner tube 5 and feeding pipeline 1 is connected by bolt, the bottom of downcomer 9 is welded with flange 2, the top of furnace inner material pipe 10 is provided with flange 2, and the flange 2 on downcomer 9 and furnace inner material pipe 10 is connected by bolt, so that it is convenient and fast to maintain and replace. On the basis of embodiment 4, the valve body inner tube 5, valve plate 6 and peripheral tube 7 of the utility model are all made of steel plate material, so that the wear is reduced when the raw materials pass, and the service life is increased.

[0032] The working principle of the gravity type check valve for the feeding pipe is that the valve body inner pipe 5 is sleeved with the peripheral pipe 7, the valve body inner pipe 5 is extended out of the peripheral pipe 7 through the opening at the top of the valve body inner pipe 5, and a closed inner cavity is formed between the top plate 3 and the bottom plate 8 of the valve body inner pipe 5 and the peripheral pipe 7; the balance lever 17 is fixed to one end of the valve shaft 13 through the bolt 14, and the weight block 15 is arranged on the balance lever 17 to play a counterweight role, the two sides of the weight block 15 are provided with the nuts 16, the weight block 15 is fixed to the balance lever 17 through the two nuts 16, the relative fixation between the weight block 15 and the balance lever 17 is ensured, the valve plate 6 is fixed to the peripheral pipe 7 through the valve shaft 13, the upper surface of the valve plate 6 is attached to and sealingly cooperates with the end of the valve body inner pipe 5, the weight block 15 is fixed to the balance lever 17 to form a rigid connection, and the valve plate 6 is automatically closed through gravity; the fire source such as flue gas and sparks in the furnace is prevented from entering the feeding pipe 1 and flying into the inside of the stock bin, and the phenomena of smoke running in production and flue gas overflowing are reduced.

[0033] The working process of the gravity type check valve for the feeding pipe is that, in the smelting process, the mixed raw materials are fed into the valve body inner pipe 5 from the feeding pipe 1, when the impact force of the raw materials is greater than the gravity of the weight 15 on the balance lever 17, the valve plate 6 rotates by a certain angle around the valve shaft 13, a certain gap is formed between the valve plate 6 and the valve body inner pipe 5, the raw materials enter the peripheral pipe 7, and then enter the inside of the furnace cover 18 through the discharging pipe 9 and the furnace material pipe 10 in the furnace, and finally enter the furnace.

[0034] The gravity type check valve for the feeding pipe is used in the smelting process, when the materials fall on the valve plate 6, the valve plate 6 rotates and opens under the action of gravity; the valve plate 6 and the weight block 15 are integrated; when the feeding is stopped, the valve plate 6 reversely rotates under the action of the weight block 15, the valve plate 6 rotates to the end surface of the valve body inner pipe 5 and sealingly cooperates with the bottom end of the valve body inner pipe 5, the valve body inner pipe 5 is closed, the flue gas cannot overflow from the pipe to the outside of the furnace, the air is not polluted, the dangerous accidents are avoided, the equipment maintenance rate is reduced, and the production efficiency is improved.

Claims

1. A weight check valve for a charging pipe of a metallurgical arc furnace, characterized in that The feeding pipe (1) is sleeved with the valve inner pipe (5) at the bottom, the valve inner pipe (5) is sleeved with the peripheral pipe (7) at the bottom, the valve inner pipe (5) is provided with a cover plate assembly at the bottom, the peripheral pipe (7) is sleeved with the lower discharging pipe (9) at the bottom, the lower discharging pipe (9) is sleeved with the furnace inner material pipe (10) at the bottom, the furnace inner material pipe (10) extends into the furnace cover (18) at the bottom, and the axes of the feeding pipe (1), the valve inner pipe (5), the lower discharging pipe (9) and the furnace inner material pipe (10) are in the same straight line.

2. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 1, characterized in that, The cross section of the peripheral pipe (7) is in the shape of "U", the side plate (4) is arranged at the opening end of the "U" shape structure in the longitudinal direction of the peripheral pipe (7), the side plate (4) is used for sealing the "U" shape structure, and the "U" shape structure is airtight welded.

3. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 2, characterized in that, A through hole is formed in the upper part of the peripheral pipe (7) and away from one side of the "U" shape bending part, the sliding shaft sleeve (11) is sleeved in the through hole, the sliding shaft sleeves (11) on the two sides of the peripheral pipe (7) are concentric, the retaining ring (12) is embedded in the sliding shaft sleeve (11), the valve shaft (13) is sleeved between the two retaining rings (12), the valve shaft (13) is fixed with the sliding shaft sleeve (11) by the retaining ring (12), and the valve shaft (13) extends out of the outer side of the peripheral pipe (7).

4. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 3, characterized in that, The cover plate assembly comprises the valve plate (6), one end of the valve plate (6) is fixedly connected with the valve shaft (13), the bottom of the valve inner pipe (5) is chamfered, the valve plate (6) completely covers the chamfered surface of the bottom of the valve inner pipe (5), and the upper surface of the valve plate (6) is tightly sealed against the bottom of the valve inner pipe (5).

5. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 4, characterized in that, One end of the valve shaft (13) extending out of the peripheral pipe (7) is fixed with the balance lever (17) through the bolt (14), and the balance lever (17) is fixedly provided with the weight block (15) through the nut (16).

6. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 5, characterized in that, The upper surface of the peripheral pipe (7) is provided with the top plate (3), the bottom of the peripheral pipe (7) is provided with the bottom plate (8), the peripheral pipe (7) is respectively sealed and connected with the valve inner pipe (5) and the lower discharging pipe (9) through the top plate (3) and the bottom plate (8), the feeding hole is formed in the central position of the top plate (3) and the bottom plate (8), and the valve inner pipe (5) and the lower discharging pipe (9) are concentric circles located on the same axis.

7. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 6, characterized in that, The valve inner pipe (5) is provided with the flange (2) at the top end, the bottom of the feeding pipe (1) is welded with the flange (2), the valve inner pipe (5) and the feeding pipe (1) are connected through the flanges (2) on the valve inner pipe (5) and the feeding pipe (1) by bolts, the bottom of the lower discharging pipe (9) is welded with the flange (2), the top end of the furnace inner material pipe (10) is provided with the flange (2), and the lower discharging pipe (9) and the furnace inner material pipe (10) are connected through the flanges (2) on the lower discharging pipe (9) and the furnace inner material pipe (10) by bolts.

8. A weight check valve for a charging pipe of a metallurgical electric arc furnace according to claim 7, characterized in that, The valve inner pipe (5), the valve plate (6) and the peripheral pipe (7) are all made of steel plate.

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