A melting and holding furnace

Abstract

The present invention relates to a smelting and holding furnace, comprising a furnace body, a feed port is arranged on the front of the furnace body, a steel gate is covered at the feed port, the steel gate slides up and down on the front of the furnace body, a charging door is arranged in the feed port, the length of the charging door in the height direction is greater than the length of the charging port in the height direction, the charging door and the steel gate are parallel to each other and the charging door slides along the steel gate, the straight line where the charging door moves is parallel to the straight line where the steel gate moves, and the moving directions are opposite, a charging port is opened on the charging door, a charging hopper is installed on the charging door, and the size of the charging hopper can close the charging port. When charging, the heat loss of the furnace body can be reduced, and the production cost can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of melting and casting furnaces, and in particular to a melting and holding furnace. Background Art

[0002] The existing aluminum smelting and holding furnace is a new type of high-efficiency and energy-saving aluminum melting furnace developed according to the aluminum smelting process. It can well meet the requirements of strict alloy composition, discontinuous production, and large single furnace capacity in the aluminum smelting process. It has achieved the effects of reducing consumption, reducing burning loss, improving product quality, reducing labor intensity, improving labor conditions and improving production efficiency. It is suitable for intermittent operation and for smelting of alloys and a lot of return materials. When the smelting and holding furnace starts smelting, it will keep the furnace in a burning state for a long time, which can prevent the furnace body from being damaged due to frequent cooling, resulting in the fire bricks on the inner wall of the furnace body falling off due to thermal expansion and contraction. Therefore, when the aluminum raw material to be smelted is added to the furnace body, the furnace body is still in a smelting state.

[0003] At present, a feeding port is arranged on the side of the smelting and holding furnace, and the feeding port is closed by a steel gate. When feeding, the steel gate is lifted by a lifting device, so that the steel gate rises along the side of the smelting and holding furnace with the feeding port. During normal smelting in the furnace body, it is necessary to continuously replenish materials so that there is always a certain amount of materials in the furnace body. However, during the replenishing process, the feeding port of the smelting and holding furnace is opened, and a large amount of heat in the furnace body will be dissipated, resulting in a drop in the temperature in the furnace body, wasting a large amount of heat, thereby increasing fuel consumption and increasing production costs. The heat emitted during the feeding process can also easily cause harm to the operators next to the furnace body. Summary of the invention

[0004] The object of the present invention is to provide a smelting and holding furnace which can reduce the heat loss of the furnace body and reduce the production cost when feeding materials.

[0005] The above-mentioned object of the present invention is achieved through the following technical scheme: a smelting and holding furnace, including a furnace body, a feed port is arranged on the front side of the furnace body, a steel gate is covered at the feed port, the steel gate slides up and down on the front side of the furnace body, a feeding door is arranged in the feed port, the length of the feeding door in the height direction is greater than the length of the feed port in the height direction, the feeding door and the steel gate are parallel to each other and the feeding door slides along the steel gate, the straight line where the feeding door moves is parallel to the straight line where the steel gate moves, and the moving directions are opposite, a feeding port is opened on the feeding door, and a feeding hopper is installed on the feeding door, and the size of the feeding hopper can close the feeding port.

[0006] By adopting the above technical solution, when it is necessary to feed materials, the steel gate on the front of the furnace body that was originally closed is raised. During the process of the steel gate being raised, the feeding door is lowered. When the bottom end of the steel gate is raised to a position lower than the upper side of the feeding door and higher than the upper side of the feeding port, materials can be fed into the furnace body through the feeding hopper. During the process of feeding materials through the feeding hopper, the feeding port of the furnace body is blocked by the steel gate, the feeding door and the feeding hopper, which reduces the speed of heat loss in the furnace body due to feeding, thereby saving fuel and reducing production costs.

[0007] The present invention is further configured as follows: a first rack is fixedly installed on the side of the feeding gate close to the steel gate, a second rack is fixedly installed on the side of the steel gate close to the feeding gate, the first rack and the second rack are both parallel to the straight line where the moving direction of the steel gate is located, a first rack is respectively installed on the left and right sides of the feeding gate, a second rack is respectively installed on the left and right sides of the steel gate, and lifting gears are rotatably installed on the left and right side surfaces of the inner side surface of the feed port, the lifting gear is located between the first rack and the second rack on the same side, and meshes with the first rack and the second rack.

[0008] By adopting the above technical solution, when the steel gate rises, the second rack rises, thereby driving the lifting gear to rotate, and driving the first rack to descend, thereby causing the feeding door to descend. Because the feeding door is set at a position close to the inner side of the furnace body of the steel gate, its ambient temperature is high, and the lifting structure such as the wire rope contains grease and other structures inside. If the grease evaporates, its toughness will decrease, so it is not resistant to high temperatures and cannot be used. The structure of the gear and rack can withstand high temperatures and can be used in such an environment. In addition, such a structure does not require an additional driving device, and the internal feeding door can be driven directly by the device that drives the steel gate to move. The structure is simple and more practical.

[0009] The present invention is further configured as follows: the distances between the lifting gear and the upper and lower sides of the feed port are smaller than the distance between the upper and lower ends of the feeding door; when the steel gate is located at the lowest point, the length of a section of the second rack located on the lower side of the lowest lifting gear is equal to the distance between the lower side of the feed port and the lower side of the feeding door.

[0010] By adopting the above technical solution, the feeding door is always meshed with the lifting gear during the movement, so that the feeding door can move well. During the rising process of the steel gate, the distance between the lower end of the feeding door and the lower side of the feed port becomes smaller and smaller until they fit together; at this time, because the height of the feeding door is greater than half of the height of the feed port, only part of the structure is exposed, which is not convenient for subsequent personnel to feed. By reducing the length of the second rack, when the lower side of the feeding door initially abuts against the lower side of the feed port, the second rack does not mesh with the lifting gear, so that the steel gate can continue to be raised, so that the feeding door can expose more area, which is convenient for subsequent feeding.

[0011] The present invention is further configured as follows: an auxiliary cover plate is fixedly connected to the lower side of the feeding door, the thickness of the auxiliary cover plate is less than the thickness of the feeding door, an auxiliary groove with a size equal to that of the auxiliary cover plate is opened on the lower side of the feeding port, the auxiliary cover plate and the feeding door have equal widths, the auxiliary cover plate and the auxiliary groove are both parallel to the feeding door, and when the steel gate is at the lowest point, the spacing between the lower side of the steel gate and the lower side of the feeding port is equal to the spacing between the lower side of the auxiliary cover plate and the lower side of the feeding port.

[0012] By adopting the above technical solution, during the process of the steel gate rising, the lower side of the charging door has not yet abutted against the lower side of the feeding port. At this time, the heat in the furnace body is still easy to leak from the feeding port, which leads to fuel waste. By providing an auxiliary cover plate, when the steel gate rises to a position where the lower side of the steel gate is equal to the lower side of the feeding port, the lower side of the auxiliary cover plate is also located at this height. Thereby, the gap between the lower side of the charging door and the lower side of the feeding port is closed, further reducing the speed of heat loss from the furnace body and reducing production costs.

[0013] The present invention is further configured as follows: the feeding hopper includes a closing plate and a lifting plate which are perpendicular to each other, the closing plate is equal in size to the feeding port, the lower side of the closing plate is parallel to the lower side of the feeding port, the lower side of the closing plate is connected to one side of the lifting plate, the feeding hopper is hinged on the inner side of the feeding port, the rotation axis of the feeding hopper is parallel to the side where the closing plate and the lifting plate are connected, and the rotation axis is located on the side of the lower side of the feeding hopper away from the steel gate.

[0014] By adopting the above technical solution, the feeding hopper can preliminarily close the feeding port. When feeding, the raw materials can be placed in the feeding hopper, and the raw materials can be fed in by rotating the feeding hopper, which is more convenient and simple. Because the original feeding method is to install a feeding bucket on the end of the steel fork of the forklift, and then use the forklift to send the feeding bucket into the furnace body. Because the feeding port on the feeding door is relatively small, and the original forklift is difficult to operate for feeding, it is also easy to cause damage to the feeding door. Therefore, by providing a feeding hopper, it can not only play the role of closing the feeding port, but also facilitate feeding.

[0015] The present invention is further configured as follows: a hinged rod is fixedly provided on the feeding hopper, the center line of the hinged rod and the rotation axis are located in the same straight line, the two ends of the hinged rod are respectively located on both sides of the feeding port, a rotating gear set is rotatably installed at the end of the hinged rod and on the feeding door, and a rotating rack is fixedly installed on the left and right sides of the feeding port, the rotating rack is meshed with the rotating gear set, and when the height of the rotating gear set rises, it drives the feeding hopper to flip toward the side away from the steel gate, and when the feeding door is at the lowest point, the lifting plate abuts against the lower side surface of the feeding port.

[0016] By adopting the above technical solution, after the steel gate is opened, the feeding gate is located at the lowest point of the feeding port. At this time, the lifting plate in the feeding hopper fits the lower side of the feeding port, and the closing plate just closes the feeding port. When the steel gate is lowered and closed, the feeding gate rises, and the rotating gear set meshes with the rotating rack, thereby driving the feeding hopper to flip toward the side away from the steel gate, and then feeding the material in the feeding hopper into the furnace body. At this time, the steel gate has been closed, and the heat cannot be well dissipated from the opened feeding port, effectively reducing the amount of heat in the furnace body that is dissipated from the feeding port. And because the height of the entire feeding hopper along the rotating rack is relatively higher, and the angle of the feeding hopper is small, if a large gear is directly used to drive the feeding hopper to rotate, it occupies a large space and is not convenient for installation. The use of a rotating gear set can well replace the role of a large gear. Compared with a large gear driving the feeding hopper to rotate, such a structure saves more materials and occupies more space.

[0017] The present invention is further configured as follows: the length of the lifting plate perpendicular to the direction of the hinged rod is greater than the thickness of the feeding door, the hinged rod is connected to the lifting plate, and there is a gap between the hinged rod and the closing plate, and a baffle plate is fixedly arranged on the side of the feeding door away from the steel gate, the baffle plate is arranged on the other side edges of the feeding port except the lower side edge, and the length of the baffle plate in the direction perpendicular to the hinged rod is equal to the distance between the hinged rod and the closing plate.

[0018] By adopting the above technical solution, in order to save materials, the thickness of the charging door is generally thinner, and in order to reduce the number of times the steel gate is raised and lowered, it is necessary to put in enough materials at one time. Therefore, the length of the lifting plate perpendicular to the hinge rod is set to be greater than the thickness of the charging door. Compared with the structure in which the length of the lifting plate perpendicular to the hinge rod is set to be equal to the thickness of the charging door, the size of the internal space of the charging hopper is increased. In addition, the gap between the closing plate and the charging door is closed by the shielding plate, so that the heat in the furnace body is not easily dissipated from the gap between the closing plate and the charging door.

[0019] The present invention is further configured as follows: the front side of the furnace body and the steel gate are both arranged to be inclined downward, and the upper side edge of the steel gate is a side edge close to the inside of the furnace body.

[0020] By adopting the above technical solution, in the process of lowering the steel gate, the hopper finally rotates to the position where the closing plate is perpendicular to the steel gate. Compared with the case where the steel gate is vertically set and the closing plate is horizontally set, in this structure, the closing plate is inclined, and the material in the hopper can slide down along the closing plate and fall into the furnace body.

[0021] The present invention is further configured as follows: a guide slope is provided in the furnace body, and the guide slope is arranged to be inclined downward from a side of the furnace body where a steel gate is provided.

[0022] By adopting the above technical solution, because the size of the closing plate is limited by the feeding port, the closing plate is short, and the material in the feeding hopper cannot slide well to the center of the furnace body. By providing a guide slope, the material in the feeding hopper slides down to the center of the furnace body along the guide slope after sliding out of the feeding hopper, which is convenient for melting the material.

[0023] In summary, the beneficial technical effects of the present invention are:

[0024] 1. It can reduce the heat loss of the furnace during feeding and reduce production costs;

[0025] 2. The material can be put into the center of the furnace well, so that the material can be melted well. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the external structure of the furnace body;

[0027] Figure 2 It is a schematic diagram of the internal structure of the furnace body behind the side wall on one side;

[0028] Figure 3 It is a structural schematic diagram of the first rack, the second rack and the lifting gear;

[0029] Figure 4 This is a schematic diagram of the structure with the side wall of the furnace hidden and the steel gate lowered;

[0030] Figure 5 yes Figure 4 The enlarged schematic diagram of point A in the middle;

[0031] Figure 6 It is a schematic diagram of the structure with part of the side wall of the furnace hidden and the steel gate raised.

[0032] Figure numerals: 1. furnace body; 11. feed port; 12. steel gate; 2. feeding door; 21. feeding port; 3. first rack; 31. second rack; 32. lifting gear; 4. auxiliary cover plate; 41. auxiliary slot; 5. feeding hopper; 51. closing plate; 52. lifting plate; 53. hinged rod; 54. rotating gear set; 541. first gear; 542. second gear; 543. third gear; 544. fourth gear; 55. rotating rack; 6. shielding plate; 7. guide ramp. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1 and Figure 2 As shown, a melting and holding furnace comprises a furnace body 1. A square feed port 11 is provided on the front of the furnace body 1. The front of the furnace body 1 is inclined. The distance between the upper end of the front of the furnace body 1 and the center of the furnace body 1 is smaller than the distance between the lower end of the front of the furnace body 1 and the center of the furnace body 1. A square steel gate 12 is installed on the front of the furnace body 1. The steel gate 12 moves up and down along the front of the furnace body 1. The cross section of the steel gate 12 is larger than the feed port 11 and the cover is arranged on the feed port 11. A square feeding door 2 is installed in the feed port 11. The feeding door 2 is parallel to the steel gate 12. The length of the feeding door 2 in the horizontal direction is equal to the length of the feeding port 11 in the horizontal direction. The distance between the upper side and the lower side of the feeding door 2 is greater than half of the height of the feeding port 11. A square feeding port 21 is provided at the center of the feeding door 2. A feeding hopper 5 is installed in the feeding port 21.

[0035] like Figure 2 and Figure 3As shown, two first racks 3 are fixedly installed on the side of the feeding door 2 close to the steel gate 12, and one first rack 3 is provided on each of the two longitudinal sides of the feeding door 2; two second racks 31 are fixedly installed on the side of the steel gate 12 close to the feeding door 2, and one second rack 31 is provided on each of the two longitudinal sides of the feeding door 2. A lifting gear 32 is installed on the longitudinal side of the feeding port 11, and the lifting gear 32 is located between the first rack 3 and the second rack 31 on the same side, and the lifting gear 32 is meshed with the first rack 3 and the second rack 31. The distance between the lifting gear 32 and the upper side of the feeding port 11, and the distance between the lifting gear 32 and the lower side of the feeding port 11 are both less than the height of the feeding door 2. When the steel gate 12 is at the lowest point, the length of a section of the second rack 31 located below the lowermost lifting gear 32 is equal to the distance between the lower side of the feeding port 11 and the lower side of the feeding door 2. Because when the steel gate 12 is fully closed, its lower end is often lower than the lower side of the feed port 11. In the process of raising the steel gate 12, the height to which the steel gate 12 is raised is the height to which the feeding gate 2 is lowered. When the feeding gate 2 is lowered to a position where the lower side just fits with the lower side of the feed port 11, the lower end of the first rack 3 does not mesh with the lifting gear 32.

[0036] like Figure 2 and Figure 3 As shown, an auxiliary cover plate 4 is fixedly welded on the lower side of the feeding door 2, the width of the auxiliary cover plate 4 is equal to the width of the feeding door 2, and the thickness of the auxiliary cover plate 4 is less than the thickness of the feeding door 2. An auxiliary groove 41 is provided on the lower side of the feeding port 11, the auxiliary groove 41 and the auxiliary cover plate 4 are located in the same plane, and the cross section of the auxiliary groove 41 is equal to the cross section of the auxiliary cover plate 4. When the steel gate 12 is located at the lowest point, the lower side of the steel gate 12 is located at the lower side of the lower side of the feeding port 11, the lower side of the auxiliary cover plate 4 is located at the upper side of the lower side of the feeding port 11, and the distance between the lower side of the steel gate 12 and the lower side of the feeding port 11 is equal to the distance between the lower side of the auxiliary cover plate 4 and the lower side of the feeding port 11. The depth of the auxiliary groove 41 is greater than the height of the auxiliary cover plate 4. When the steel gate 12 rises to a position where the lower side of the steel gate 12 is at the same height as the lower side of the feed port 11 , the lower side of the auxiliary cover plate 4 is also at this height, which well seals the feed port 11 and further reduces the speed of heat loss from the furnace body 1 .

[0037] like Figure 3 and Figure 4As shown, the feeding hopper 5 includes a closing plate 51 and a lifting plate 52, and the closing plate 51 is perpendicular to the lifting plate 52. The cross-sectional size of the closing plate 51 is equal to the cross-sectional size of the feeding port 21, and the lifting plate 52 is connected to the side of the closing plate 51 close to the steel frame plate, and is fixedly connected to the lower side of the closing plate 51. The width of the lifting plate 52 is equal to the width of the feeding port 21, and the length of the side of the lifting plate 52 perpendicular to the closing plate 51 is greater than the thickness of the feeding gate 2. A hinge rod 53 is fixedly installed on the bottom surface of the lifting plate 52, and the hinge rod 53 is parallel to the side where the lifting plate 52 and the closing plate 51 are connected to each other. The hinge rod 53 is located on the side of the lifting plate 52 away from the steel gate 12, and the distance between the hinge rod 53 and the steel gate 12 is slightly greater than the depth of the feeding, and both ends of the hinge rod 53 are in contact with the vertical side of the feeding port 11. Three shielding plates 6 are welded on the side of the feeding door 2 away from the steel gate 12. The shielding plates 6 are perpendicular to the feeding door 2. The shielding plates 6 are respectively arranged along the left and right side edges and the upper side edges of the feeding port 21. The length of the shielding plates 6 is equal to the length of the side edge of the feeding port 21 to which it is connected, and the width of the shielding plates 6 is equal to the distance between the hinge rod 53 and the closing plate 51. Because the thickness of the feeding door 2 is generally thin, and in order to reduce the number of times the steel gate 12 is raised and lowered, it is necessary to put in enough materials at one time. Therefore, the lifting plate 52 is set wider, which increases the size of the internal space of the feeding hopper 5. And the shielding plates 6 are used to close the gap between the closing plate 51 and the feeding door 2, so that the heat in the furnace body 1 is not easily lost from the gap between the closing plate 51 and the feeding door 2.

[0038] like Figure 5 and Figure 6 As shown, a rotating gear set 54 is rotatably mounted at the end of the hinged rod 53 and on the feeding door 2, and the rotating gear set 54 includes a first gear 541 fixedly mounted on both ends of the hinged rod 53, the first gear 541 is meshed with a second gear 542 rotatably mounted on the feeding door, a third gear 543 coaxial with the second gear 542 is mounted on the feeding door 2, the diameter of the third gear 543 is smaller than the second gear 542, and a fourth gear 544 is also mounted on the feeding door 2. A rotating rack 55 is fixedly mounted on the vertical side of the feed port 11, and the rotating rack 55 is parallel to the plane where the steel gate 12 is located. The rotating rack 55 is located on the side of the rotating gear set 54 close to the steel gate 12, and the fourth gear 544 is meshed with the rotating rack 55. Combined with Figure 3As shown, when the height of the rotating gear set 54 rises, the feeding hopper 5 is driven to flip toward the side away from the steel gate 12. When the feeding door 2 is located at the lowest point of the feeding port 11, the lifting plate 52 fits with the lower side surface inside the feeding port 21, and when the feeding door 2 is located at the highest point of the feeding port 11, the lifting plate 52 flips to fit with the side of the feeding door 2 away from the steel gate 12. After the steel gate 12 is opened, the lifting plate 52 fits with the lower side surface of the feeding port 11, and the closing plate 51 closes the feeding port 21. When the steel gate 12 is lowered and closed, the feeding hopper 5 flips toward the side away from the steel gate 12, and the material in the feeding hopper 5 is fed into the furnace body 1. Because the height of the entire feeding hopper 5 along the rotating rack 55 is relatively higher, and the angle of the feeding hopper 5 flipping is smaller, by providing a rotating gear set 54, compared with a large gear driving the feeding hopper 5 to rotate, more materials and space are saved.

[0039] like Figure 2 As shown, a guide slope 7 is integrally formed at a position adjacent to the bottom surface of the furnace body 1 and the front surface of the furnace body 1. The horizontal length of the guide slope 7 is greater than the height of the closing plate 51, and the end of the guide slope 7 close to the steel gate 12 is the higher end. After the material in the hopper 5 slides down from the hopper 5, it will fall on the guide slope 7 and finally slide down to the center of the furnace body 1 along the guide slope 7, so that the material is fully melted.

[0040] Its working process is as follows: after the holding furnace has been smelted for a period of time, when it is necessary to feed again, the originally closed steel gate 12 is first raised. During the raising process, the first rack 3 and the second rack 31 move under the action of the lifting gear 32, thereby lowering the feeding gate 2 originally located at the upper end of the feeding port 11. When the lower end of the steel gate 12 is raised to a position equal to the height of the lower end of the feeding port 11, the lower end of the auxiliary cover plate 4 at the lower end of the feeding gate 2 is at the same height as the lower end of the steel gate 12, closing the feeding port 11. After that, the steel gate 12 continues to rise until the lower side of the feeding gate 2 abuts against the lower side of the feeding port 11. At this time, the second rack 31 on the steel gate 12 is not engaged with the lifting gear 32, and the steel gate 12 can continue to rise until the lower end of the steel gate 12 is slightly lower than the upper end of the feeding gate 2. At this time, the feeding hopper 5 on the feeding door 2 closes the feeding port 21 on the entire feeding door 2 under the action of the shielding plate 6. The worker puts the material to be smelted into the feeding hopper 5. Then the steel gate 12 is lowered to make the feeding door 2 rise. During the rising process, the feeding hopper 5 turns toward the side away from the steel gate 12. And finally turns to a position where the lifting plate 52 is parallel to the feeding door 2. Because the steel gate 12 and the feeding door 2 are both inclined, the material in the feeding hopper 5 can be completely put into the furnace body 1. When feeding, the heat loss of the furnace body 1 can be reduced, thereby reducing production costs.

[0041] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A smelting and holding furnace, comprising a furnace body (1), a feed port (11) being arranged on the front of the furnace body (1), a steel gate (12) being arranged on the feed port (11), and the steel gate (12) being arranged on the front of the furnace body (1) so as to slide up and down, characterized in that: A feeding gate (2) is arranged in the feeding port (11), the length of the feeding gate (2) in the height direction is greater than the length of the feeding port (11) in the height direction, the feeding gate (2) and the steel gate (12) are parallel to each other and the feeding gate (2) slides along the steel gate (12), the straight line where the feeding gate (2) moves is parallel to the straight line where the steel gate (12) moves, and the moving directions are opposite, a feeding port (21) is opened on the feeding gate (2), and a feeding hopper (5) is installed on the feeding gate (2), and the size of the feeding hopper (5) can close the feeding port (21); A first rack (3) is fixedly installed on one side of the feeding gate (2) close to the steel gate (12), and a second rack (31) is fixedly installed on one side of the steel gate (12) close to the feeding gate (2). Both the first rack (3) and the second rack (31) are parallel to the straight line in which the steel gate (12) moves. A first rack (3) is installed on the left and right sides of the feeding gate (2), and a second rack (31) is installed on the left and right sides of the steel gate (12). Lifting gears (32) are rotatably installed on the left and right side surfaces of the inner side surface of the feeding port (11). The lifting gear (32) is located between the first rack (3) and the second rack (31) on the same side, and meshes with the first rack (3) and the second rack (31). The feeding hopper (5) comprises a closing plate (51) and a lifting plate (52) which are perpendicular to each other. The closing plate (51) is equal in size to the feeding port (21). The lower side of the closing plate (51) is parallel to the lower side of the feeding port (21). The lower side of the closing plate (51) is connected to one side of the lifting plate (52). The feeding hopper (5) is hinged on the inner side of the feeding port (21). The rotation axis of the feeding hopper is parallel to the side where the closing plate (51) and the lifting plate (52) are connected. The rotation axis is located on the side of the lower side of the feeding hopper (5) away from the steel gate (12). The feeding hopper (5) is fixedly provided with an articulated rod (53), the center line of the articulated rod (53) and the rotation axis are located in the same straight line, the two ends of the articulated rod (53) are respectively located on both sides of the feeding port (11), a rotating gear set (54) is rotatably installed at the end of the articulated rod (53) and on the feeding door (2), and a rotating rack (55) is fixedly installed on the left and right sides of the feeding port (11), and the rotating rack (55) is meshed with the rotating gear set (54). When the height of the rotating gear set (54) rises, it drives the feeding hopper (5) to flip toward the side away from the steel gate (12). When the feeding door (2) is at the lowest point, the lifting plate (52) abuts against the lower side of the feeding port (11); An auxiliary cover plate (4) is fixedly connected to the lower side of the feeding door (2), the thickness of the auxiliary cover plate (4) is less than the thickness of the feeding door (2), an auxiliary groove (41) of the same size as the auxiliary cover plate (4) is opened on the lower side of the feeding port (11), the auxiliary cover plate (4) and the feeding door (2) have the same width, the auxiliary cover plate (4) and the auxiliary groove (41) are parallel to the feeding door (2), and when the steel gate (12) is at the lowest point, the distance between the lower side of the steel gate (12) and the lower side of the feeding port (11) is equal to the distance between the lower side of the auxiliary cover plate (4) and the lower side of the feeding port (11).

2. A melting and holding furnace according to claim 1, characterized in that: The distances between the lifting gear (32) and the upper and lower sides of the feed port (11) are smaller than the distance between the upper and lower ends of the feeding door (2). When the steel gate (12) is at the lowest point, the length of a section of the second rack (31) located below the lowest lifting gear (32) is equal to the distance between the lower side of the feed port (11) and the lower side of the feeding door (2).

3. The smelting and holding furnace according to claim 1, characterized in that: The length of the lifting plate (52) in a direction perpendicular to the hinged rod (53) is greater than the thickness of the feeding door (2). The hinged rod (53) is connected to the lifting plate (52), and a gap is spaced between the hinged rod (53) and the closing plate (51). A shielding plate (6) is fixedly arranged on the side of the feeding door (2) away from the steel gate (12). The shielding plate (6) is arranged on the other side of the feeding port (21) except the lower side. The length of the shielding plate (6) in a direction perpendicular to the hinged rod (53) is equal to the distance between the hinged rod (53) and the closing plate (51).

4. A melting and holding furnace according to claim 3, characterized in that: The front side of the furnace body (1) and the steel gate (12) are both arranged to be inclined downward, and the upper side of the steel gate (12) is a side close to the inside of the furnace body (1).

5. The smelting and holding furnace according to claim 1, characterized in that: A guide slope (7) is arranged in the furnace body (1), and the guide slope (7) is arranged to be inclined downward from a side of the furnace body (1) where a steel gate (12) is arranged.

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