Dry furnace door assembly for metallurgical submerged arc furnace
By designing a dry furnace door assembly, the problems of water leakage and deformation in water-cooled furnace doors and instability in horizontal furnace doors are solved, achieving stable opening and closing and sealing of furnace doors in high-temperature environments of metallurgical submerged arc furnaces, thereby improving the safety and service life of the equipment.
Patent Information
- Application Number
- CN202520156934.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-23
AI Technical Summary
Existing water-cooled furnace doors are prone to water leakage and deformation, leading to flue gas leakage, and are inconvenient to operate, posing safety hazards; horizontal non-water-cooled furnace door structures are prone to deformation and incomplete closure under high-temperature environments, affecting smelting quality.
The dry furnace door assembly is adopted, including the door panel, the outer furnace door assembly and the inner furnace door assembly. Through the cooperation of the lifting device and the limiting track, the door panel is not easily deformed in the high temperature environment, and the guide rollers and auxiliary stop rollers achieve stable opening and closing, reducing the failure rate.
It achieves stability and sealing of the furnace door under high-temperature conditions, reduces the failure rate, improves operational safety and equipment lifespan, and is suitable for the frequent opening and closing requirements of metallurgical submerged arc furnaces.
Smart Images
Figure CN223769246U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of metallurgical submerged arc furnace equipment, specifically relating to a dry furnace door assembly for metallurgical submerged arc furnaces. Background Technology
[0002] In the smelting process of ferroalloys and other metallurgical submerged arc furnaces, the furnace chamber is under positive pressure. A large amount of hot flue gas is discharged from the flue at the top of the fume hood and enters the dust collector. After the flue gas is filtered, it is discharged into the atmosphere. The overflow and radiant heat loss at the inlet and outlet are quite large. The main function of the furnace door is to seal the inlet and outlet, reduce heat loss, reduce furnace temperature fluctuations, reduce furnace heat loss, and improve heating quality.
[0003] During normal production, the furnace door needs to be opened frequently. Due to the high temperature inside the furnace, the temperature near the furnace door is also high. The inner wall of the furnace door is subjected to a high temperature of over 1200℃, while the outer wall of the furnace door is at room temperature. The large temperature difference makes it easy for the insulation lining to fall off and the frame to deform due to frequent opening and closing. Since the furnace door is subjected to a large area of high-temperature baking, it is generally opened and closed once every 10 to 30 minutes. Therefore, the furnace door is required to remain unchanged and have good sealing performance. In the existing technology, most furnace doors are water-cooled. The characteristic of water-cooled furnace doors is that the sealing surface and internal load-bearing frame structure of the furnace door are cooled by production water. Forced cooling with water can prevent the sealing surface and the furnace door as a whole from deforming. The disadvantages are: the cooling water carries away a lot of heat, resulting in a large heat loss, which can easily cause furnace temperature fluctuations or even a decrease, affecting the uniformity of the temperature of the steel billets to be discharged from the furnace; when the production water suddenly stops, the furnace door will be burned due to lack of water. After being burned, the furnace door is in a high-temperature environment and cannot be replaced. Moreover, if the water-cooled structure experiences other abnormal phenomena such as electric furnace sparking, such as frequent movement, it is prone to water leakage. Once water leaks, the water entering the furnace may even cause a serious explosion accident with serious consequences.
[0004] Existing technologies also employ horizontal, non-water-cooled furnace door structures, with steel plates and shaped steel welded rail-type push-pull structures. The operating environment for smelting workers is hot, and there is instability when sliding open or close. Simple pin-type positioning is prone to detaching from the track, and the furnace door often fails to close tightly. Some high-temperature flue gas inside the furnace will overflow from the gaps. During the opening process, the furnace door is prone to displacement and deformation due to collisions with debris, making the opening and closing of the furnace door difficult. The manual push-pull structure is very difficult, inconvenient to operate, and easy to cause burns. Utility Model Content
[0005] The purpose of this invention is to provide a dry furnace door assembly for metallurgical submerged arc furnaces, which solves the problem that existing water-cooled furnace doors are prone to water leakage and deformation, leading to flue gas leakage.
[0006] The technical solution adopted by this utility model is: a dry furnace door assembly for a metallurgical submerged arc furnace, including a door frame, the door frame being installed on the electric furnace, a furnace door body being installed on the door frame, the two sides of the furnace door body being integrally slidably engaged with the door frame and sealed together, and a lifting device being installed on the furnace door body.
[0007] This utility model also has the following features.
[0008] The furnace door body includes a door panel, which is rectangular. An outer furnace door assembly and an inner furnace door assembly are respectively installed on both sides of the door panel. The outer furnace door assembly is located on the outside of the door panel, and the inner furnace door assembly is located on the inside of the door panel.
[0009] The outer component of the furnace door includes an outer frame, which is integrally set on the outer circumference of the door panel. The outer frame is rectangular and made of channel steel. Connecting stiffeners are set at the four corners of the outer frame. A central stiffener is vertically connected at the center of the length of the outer frame. Vertical stiffeners are set at equal intervals on both sides of the central stiffener. The central and vertical stiffeners divide the outer frame into four rectangles. A set of diagonal reinforcing ribs is set on the diagonal of each rectangle. Fastening stiffeners are set at both ends of the central stiffener and the vertical stiffeners.
[0010] A connecting seat is provided at the bottom of the central stiffener plate, and the connecting seat fixes the diagonal reinforcing bars on both sides of the central stiffener plate.
[0011] The inner components of the furnace door include several upper clamping plates, which are arranged on the top inner side of the door panel. Several lower clamping plates are vertically and equidistantly arranged at the bottom inner side of the door panel. Five sets of snap-fit plates are vertically arranged along the length of the inner side of the door panel. The three sets of snap-fit plates in the middle are positioned corresponding to the central stiffening plate and the vertical stiffening plate. Each set of snap-fit plates is located on both sides of one central vertical stiffening plate and two vertical stiffening plates. Each set includes two corresponding snap-fit plates, and several horizontal stiffening plates are axially and evenly arranged between the two corresponding snap-fit plates. The remaining two sets of snap-fit plates are located near the side edge of the door panel. Each set includes one snap-fit plate, and several horizontal stiffening plates are axially and evenly arranged between each snap-fit plate and the edge of the door panel. The upper clamping plates, lower clamping plates, snap-fit plates, and horizontal stiffening plates near the edge of the door panel are all welded and assembled to the outer frame.
[0012] The door frame includes vertically arranged limiting tracks on both sides, which are vertically welded to the water-cooled furnace wall and slide to engage with the door panel.
[0013] Several positioning plates are set on opposite sides of the width of the outer frame. Each positioning plate has a support seat facing the limit track. A roller is set on the support seat, and a guide roller is sleeved on the roller. An auxiliary stop roller is set above the guide roller.
[0014] The lifting device includes a furnace door hanger, a furnace door hanger, a lifting pulley block and a power telescopic hydraulic cylinder connected to the top of the furnace door hanger, the lifting pulley block and the power telescopic hydraulic cylinder are fixed on the electric furnace, a hanging seat is set on the top of the outer frame, and the furnace door hanger is connected to the furnace door hanging seat at the bottom.
[0015] The beneficial effects of this utility model are as follows: The dry furnace door assembly for metallurgical submerged arc furnaces reinforces the furnace door body through the cooperation of the door panel, outer furnace door assembly, and inner furnace door assembly, making it less prone to deformation due to heat during the opening and closing of the furnace door. The lifting device and limiting track work together to ensure the door panel opens and closes vertically, reducing its failure rate. It does not require water cooling, is more robust and durable, resistant to high temperatures, prevents deformation, and has good safety performance. The furnace door has a wide range of applications, including various drying and heating furnaces with vertically lifting and closing mechanisms, and can be used in industrial fields such as these. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the dry furnace door assembly structure for a metallurgical submerged arc furnace according to this utility model.
[0017] Figure 2 This is a schematic diagram of the external component structure of the furnace door of this utility model;
[0018] Figure 3 This is a top view of the outer component of the furnace door of this utility model;
[0019] Figure 4 This is a schematic diagram of the structure of the inner component of the furnace door of this utility model;
[0020] Figure 5 This is a schematic diagram of the structure of the limiting track of this utility model;
[0021] In the diagram, 1. Furnace door body, 2. Water-cooled column, 3. Door frame, 4. Lifting device, 5. Door panel, 6. Outer frame, 7. Connecting stiffener, 8. Positioning plate, 9. Vertical stiffener, 10. Diagonal stiffener, 11. Fastening stiffener, 12. Connecting seat, 13. Central stiffener, 14. Upper clamping plate, 15. Lower clamping plate, 16. Buckle plate, 17. Horizontal stiffener, 18. Limiting track, 19. Guide roller, 20. Auxiliary stop roller. Detailed Implementation
[0022] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0023] Example 1
[0024] This utility model relates to a dry furnace door assembly for metallurgical submerged arc furnaces, with the structure as follows: Figure 1 As shown, it includes a door frame 3, which is rectangular and set on the electric furnace. A furnace door body 1 is matched and set on the door frame 3. The two sides of the furnace door body 1 are integrally slidably connected to the door frame 3 and sealed together. A lifting device 4 is set on the furnace door body 1.
[0025] Example 2
[0026] This utility model relates to a dry furnace door assembly for a metallurgical submerged arc furnace, comprising a door frame 3, which is rectangular and mounted on the electric furnace. A furnace door body 1 is fitted onto the door frame 3, and the two sides of the furnace door body 1 are integrally slidably engaged with and sealed to the door frame 3. A lifting device 4 is provided on the furnace door body 1. Based on Embodiment 1, this embodiment's furnace door body 1 includes a door panel 5, which is rectangular. An outer furnace door assembly and an inner furnace door assembly are respectively provided on the front and back sides of the door panel 5. The outer furnace door assembly is located on the outside of the door panel 5, and the inner furnace door assembly is located on the inside of the door panel 5. During production, the inner furnace door assembly is relatively close to the furnace chamber. The inner furnace door assembly reinforces the door panel 5, preventing it from deforming due to heat during opening and closing. The inner furnace door assembly is connected to and assembled with the outer furnace door assembly.
[0027] Example 3
[0028] This utility model relates to a dry furnace door assembly for a metallurgical submerged arc furnace, comprising a door frame 3, which is rectangular and mounted on the electric furnace. A furnace door body 1 is fitted onto the door frame 3, and the two sides of the furnace door body 1 are integrally slidably engaged with and sealed to the door frame 3. A lifting device 4 is provided on the furnace door body 1. The furnace door body 1 includes a door panel 5, which is rectangular. An outer furnace door assembly and an inner furnace door assembly are respectively provided on both sides of the door panel 5. The outer furnace door assembly is located on the outside of the door panel 5, and the inner furnace door assembly is located on the inside of the door panel 5. During production, the inner furnace door assembly is relatively close to the furnace chamber. The inner furnace door assembly reinforces the door panel 5, preventing it from deforming due to heat during opening and closing. The inner furnace door assembly is connected to and assembled with the outer furnace door assembly. Based on Embodiment 2, this embodiment... Figure 2 As shown, the outer component of the furnace door includes an outer frame 6, which is integrally set on the outer circumference of the door panel 5. The outer frame 6 is a rectangular frame made of channel steel. Connecting stiffeners 7 are provided at each of the four corners of the outer frame 6. A central stiffener 13 is vertically connected at the center of the length of the outer frame 6. Vertical stiffeners 9 are equidistantly arranged on both sides of the central stiffener 13. One central vertical stiffener 13 and two vertical stiffeners 9 divide the outer side of the door panel 5 into four rectangles. Diagonal reinforcing ribs 10 are provided on a set of diagonals in each rectangle. Fastening stiffeners 11 are provided at both ends of the two vertical stiffeners 9. Figure 3 As shown, a connecting seat 12 is provided at the bottom of the central stiffening plate 13, and the connecting seat 12 fixes the diagonal reinforcing ribs 10 on both sides of the central stiffening plate 13.
[0029] Example 4
[0030] This utility model relates to a dry furnace door assembly for a metallurgical submerged arc furnace, comprising a door frame 3, which is rectangular and mounted on the electric furnace. A furnace door body 1 is fitted onto the door frame 3, and the two sides of the furnace door body 1 are integrally slidably and sealingly connected to the door frame 3. A lifting device 4 is provided on the furnace door body 1. The furnace door body 1 includes a door panel 5, which is rectangular. An outer furnace door assembly and an inner furnace door assembly are respectively located on both sides of the door panel 5. The outer furnace door assembly is located on the outside of the door panel 5, and the inner furnace door assembly is located on the inside of the door panel 5. During production, the inner furnace door assembly is relatively close to the furnace chamber. The inner furnace door assembly reinforces the door panel 5, preventing it from deforming due to heat during opening and closing. The inner furnace door assembly is connected to and assembled with the outer furnace door assembly. The outer component of the furnace door includes an outer frame 6, which is integrally formed around the outer circumference of the door panel 5. The outer frame 6 is rectangular and made of channel steel. Connecting stiffeners 7 are provided at each of the four corners of the outer frame 6. A central stiffener 13 is vertically connected at the center of the outer frame 6. Vertical stiffeners 9 are equidistantly arranged on both sides of the central stiffener 13. One central vertical stiffener 13 and two vertical stiffeners 9 divide the outer side of the door panel 5 into four rectangles. Diagonal reinforcing ribs 10 are provided along a set of diagonals in each rectangle. Fastening stiffeners 11 are provided at both ends of the two vertical stiffeners 9. A connecting seat 12 is provided at the bottom of the central stiffener 13, fixing the diagonal reinforcing ribs 10 on both sides of the central stiffener 13. Based on embodiment 3, the inner component of the furnace door in this embodiment includes several upper clamping plates 14, such as... Figure 4 As shown, several upper clip plates 14 are arranged on the top inner side of the door panel 5, and several lower clip plates 15 are vertically and equidistantly arranged on the bottom inner side of the door panel 5; five sets of snap-on plates 16 are vertically arranged along the length of the inner side of the door panel 5; the middle three sets of snap-on plates 16 are positioned corresponding to the central stiffener 13 and the vertical stiffener 9, and each set of snap-on plates 16 is located on both sides of one central vertical stiffener 13 and two vertical stiffener 9, and each set includes two corresponding snap-on plates 16, with several horizontal stiffeners 17 evenly arranged axially between the two corresponding snap-on plates 16; the remaining two sets of snap-on plates 16 are located near the side of the door panel 5, each set including one snap-on plate 16, with several horizontal stiffeners 17 evenly arranged axially between each snap-on plate 16 and the edge of the door panel 5; the several upper clip plates 14, lower clip plates 15, snap-on plates 16 and the horizontal stiffeners 17 near the edge of the door panel 5 are all welded and assembled with the outer frame 6.
[0031] Example 5
[0032] This utility model relates to a dry furnace door assembly for a metallurgical submerged arc furnace, comprising a door frame 3, which is rectangular and mounted on the electric furnace. A furnace door body 1 is fitted onto the door frame 3, and the two sides of the furnace door body 1 are integrally slidably and sealingly connected to the door frame 3. A lifting device 4 is provided on the furnace door body 1. The furnace door body 1 includes a door panel 5, which is rectangular. An outer furnace door assembly and an inner furnace door assembly are respectively located on both sides of the door panel 5. The outer furnace door assembly is located on the outside of the door panel 5, and the inner furnace door assembly is located on the inside of the door panel 5. During production, the inner furnace door assembly is relatively close to the furnace chamber. The inner furnace door assembly reinforces the door panel 5, preventing it from deforming due to heat during opening and closing. The inner furnace door assembly is connected to and assembled with the outer furnace door assembly. The outer component of the furnace door includes an outer frame 6, which is integrally formed around the outer circumference of the door panel 5. The outer frame 6 is rectangular and made of channel steel. Connecting stiffeners 7 are provided at each of the four corners of the outer frame 6. A central stiffener 13 is vertically connected at the center of the outer frame 6. Vertical stiffeners 9 are equidistantly arranged on both sides of the central stiffener 13. One central stiffener 13 and two vertical stiffeners 9 divide the outer side of the door panel 5 into four rectangles. Diagonal reinforcing ribs 10 are provided along a set of diagonals in each rectangle. Fastening stiffeners 11 are provided at both ends of the two vertical stiffeners 9. A connecting seat 12 is provided at the bottom of the central stiffener 13, fixing the diagonal reinforcing ribs 10 on both sides of the central stiffener 13. The inner components of the furnace door include several upper clamping plates 14, which are arranged on the top inner side of the door panel 5. Several lower clamping plates 15 are vertically and equidistantly arranged at the bottom inner side of the door panel 5. Five sets of snap-fit plates 16 are vertically arranged along the length of the inner side of the door panel 5. The middle three sets of snap-fit plates 16 are positioned corresponding to the central stiffener 13 and the vertical stiffener 9. Each set of snap-fit plates 16 is located on both sides of one central vertical stiffener 13 and two vertical stiffener 9. Each set includes two corresponding snap-fit plates 16. Several horizontal stiffeners 17 are axially and evenly arranged between the two corresponding snap-fit plates 16. The remaining two sets of snap-fit plates 16 are located near the side of the door panel 5. Each set includes one snap-fit plate 16. Several horizontal stiffeners 17 are axially and evenly arranged between each snap-fit plate 16 and the edge of the door panel 5. The upper clamping plates 14, lower clamping plates 15, snap-fit plates 16, and horizontal stiffeners 17 near the edge of the door panel 5 are all welded and assembled with the outer frame 6. Based on Example 4, in this example, vertical limiting tracks 18 are installed on both sides of the door frame 3. The limiting tracks 18 are vertically welded to the water-cooled furnace wall. The limiting tracks 18 slide and engage with the inner side of the door panel 5, and the inner side of the door panel 5 moves vertically along the limiting tracks 18 on the water-cooled furnace wall. Several water-cooled columns 2 are installed inside the water-cooled furnace wall to achieve uniform heating during horizontal and vertical operation of the water-cooled furnace wall, thereby improving heat exchange efficiency.
[0033] Several positioning plates 8 are set on opposite sides of the width of the outer frame 6. Each positioning plate 8 has a support seat on the side facing the limiting track 18. A roller is set on the support seat, and a guide roller 19 is sleeved on the roller. An auxiliary stop roller 20 is set above the guide roller 19. When the door panel 5 opens and closes, the door panel 5 moves up and down on the limiting track 18 with the guide roller 19. The auxiliary stop roller 20 assists the guide roller 19 in the relative sliding trajectory on the limiting track 18.
[0034] Example 6
[0035] Based on Embodiment 5, the lifting device 4 in this embodiment includes a furnace door hanger. A lifting pulley system and a power telescopic hydraulic cylinder are connected to the top of the furnace door hanger. The lifting pulley system and the power telescopic hydraulic cylinder are fixed to the electric furnace. A hanging seat is installed at the top of the outer frame 6, and the furnace door hanger is connected to the furnace door hanging seat at the bottom. The power telescopic hydraulic cylinder controls the door panel 5 to move up and down smoothly and at a uniform speed through a hydraulic system. Because the total weight of the furnace door body 1 is generally not less than 1 t, the door panel 5 is opened by the hydraulic cylinder pulling the door panel 5 upwards. It stops when it reaches the designated opening position. By operating the reversing valve of the power telescopic hydraulic cylinder, the piston rod of the cylinder extends, pushing the door panel 5 to close. Positive and negative pressure adjustment of the airflow ensures that the door panel 5 is reliably sealed.
[0036] The working principle of this utility model for a dry furnace door assembly for a metallurgical submerged arc furnace is as follows: the guide rollers 19 cooperate with each other on the limiting track 18, moving along the fixed track of the limiting track 18 without falling off the track; the door panel 5 slides up and down along the limiting track 18 of the door frame 3; the door panel 5 completes the lifting and opening / closing through the lifting device 4; the outer and inner components of the furnace door reinforce and fasten the door panel 5; the door panel 5 uses 20g steel plate material to improve the strength and heat deformation resistance of the door panel 5; the working process of this utility model for a dry furnace door assembly for a metallurgical submerged arc furnace is as follows: the power telescopic hydraulic cylinder extends, pushing the door panel 5 downward along the limiting track 18; the guide rollers 19 slide downward along the limiting track 18 until the bottom of the door panel 5 presses against the door frame 3, completing the operation of quickly closing the furnace door; the power telescopic hydraulic cylinder retracts, pulling back the door panel 5; the guide rollers 19 on the door panel 5 slide upward along the limiting track 18, and the bottom of the door panel 5 leaves the door frame 3.
[0037] This utility model relates to a dry furnace door assembly for metallurgical submerged arc furnaces. An outer furnace door assembly and an inner furnace door assembly are respectively installed on both sides of the door panel 5. The integrated structure ensures the safety and stability of the door panel 5, guaranteeing its robustness. The door panel 5 opens and closes quickly by moving up and down, ensuring a tight seal when closed. This utility model features a simple structure, convenient operation, economy, and durability. It enables rapid and smooth opening and closing of the door panel 5, provides excellent sealing performance, and is stable, reliable, high-temperature resistant, deformation-resistant, and has good safety performance. This utility model's dry furnace door also incorporates a new track-type roller limiting mechanism, allowing for frequent up-and-down movement, further improving safety and reliability, reducing furnace maintenance time, and extending equipment lifespan.
Claims
1. Dry door assembly for a metallurgical arc furnace, characterized in that, The door frame (3) is arranged on the electric furnace, the furnace door body (1) is arranged on the door frame (3), the two sides of the furnace door body (1) are integrally and sealingly connected with the door frame (3) through sliding clamping, and the lifting device (4) is arranged on the furnace door body (1); The furnace door body (1) comprises a door plate (5), the door plate (5) is rectangular, and a furnace door outer side assembly and a furnace door inner side assembly are arranged on the two sides of the door plate (5) respectively; the furnace door outer side assembly is arranged on the outer side of the door plate (5), and the furnace door inner side assembly is arranged on the inner side of the door plate (5). The furnace door outer side assembly comprises an outer frame (6), the outer frame (6) is integrally arranged on the outer periphery of the door plate (5), the outer frame (6) is a rectangular frame, the outer frame (6) is a channel steel, a connecting rib plate (7) is arranged at each corner of the outer frame (6), a vertical connecting center rib plate (13) is arranged on the length center of the outer frame (6), vertical rib plates (9) are equidistantly arranged on the two sides of the center rib plate (13), the center rib plate (13) and the vertical rib plates (9) divide the outer frame (6) into four rectangles, diagonal reinforcing ribs (10) are arranged on a group of diagonal lines of each rectangle, and fastening rib plates (11) are arranged at the two ends of the center rib plate (13) and the vertical rib plates (9). The furnace door inner side assembly comprises a plurality of upper clamping plates (14), the plurality of upper clamping plates (14) are arranged on the inner top of the door plate (5), a plurality of lower clamping plates (15) are vertically and equidistantly arranged on the inner bottom of the door plate (5), and five groups of clamping buckle plates (16) are vertically arranged on the inner side of the door plate (5) along the length direction; the middle three groups of clamping buckle plates (16) are arranged at positions corresponding to the center rib plate (13) and the vertical rib plates (9), each group of clamping buckle plates (16) is located on the two sides of one center rib plate (13) and two vertical rib plates (9), each group comprises two corresponding clamping buckle plates (16), and a plurality of horizontal rib plates (17) are uniformly arranged in the axial direction between the two corresponding clamping buckle plates (16); the remaining two groups of clamping buckle plates (16) are located near the positions close to the side edges of the door plate (5), each group comprises one clamping buckle plate (16), and a plurality of horizontal rib plates (17) are uniformly arranged in the axial direction between each clamping buckle plate (16) and the edge of the door plate (5); and the plurality of upper clamping plates (14), the lower clamping plates (15), the clamping buckle plates (16) and the horizontal rib plates (17) close to the edges of the door plate (5) are all welded and assembled with the outer frame (6).
2. Dry gate assembly for a metallurgical furnace according to claim 1, characterized in that, The bottom of the center rib plate (13) is provided with a connecting seat (12), and the connecting seat (12) fixes the diagonal reinforcing ribs (10) on the two sides of the center rib plate (13).
3. Dry gate assembly for a metallurgical furnace according to claim 1, characterized in that, Limiting rails (18) are vertically arranged on the two sides of the door frame (3), the limiting rails (18) are vertically welded on the water-cooled furnace wall, and the limiting rails (18) are slidingly connected with the inner side of the door plate (5).
4. Dry gate assembly for a metallurgical furnace according to claim 3, characterized in that, A plurality of positioning plates (8) are correspondingly arranged on the width opposite sides of the outer frame (6), a supporting seat is arranged on each positioning plate (8) and faces one side of the limiting rail (18), a roller is arranged on the supporting seat, a guide roller (19) is sleeved on the roller, and an auxiliary stop wheel (20) is arranged above the guide roller (19).
5. Dry gate assembly for a metallurgical furnace according to claim 4, characterized in that, The lifting device (4) comprises a furnace door hanger, a lifting pulley block and a power telescopic hydraulic cylinder connected at the top of the furnace door hanger, the lifting pulley block and the power telescopic hydraulic cylinder are fixed on the electric furnace, an outer frame (6) is provided with a hanger seat at the top, and the bottom of the furnace door hanger is connected with the furnace door hanger seat.