An oven for tinplate production

Abstract

This utility model discloses an oven for tinplate production, comprising a box body with a preheating zone, a main heating zone, and a heat preservation zone inside. Each of the preheating zone, main heating zone, and heat preservation zone is fixedly connected to a partition, with a slot in the center of each partition. An upper V-shaped guide pipe is fixedly connected to the lower end of the top plate of the box body, and a lower V-shaped guide pipe is fixedly connected to the upper end of the bottom plate of the box body. By setting up three independent zones—preheating zone, main heating zone, and heat preservation zone—and cooperating with the upper and lower V-shaped guide pipes to achieve bidirectional airflow coverage, combined with the zoned arrangement of upper and lower heating pipes, the uniformity of heating of the plate is greatly improved, and the lateral temperature difference of the plate surface is small. This design effectively avoids the problem of inconsistent melting and crystallization of the tin plating layer caused by uneven temperature in traditional ovens, and eliminates defects such as white fog and black spots.

Description

Technical Field

[0001] This utility model relates to the technical field of tinplate production equipment, and in particular to an oven for tinplate production. Background Technology

[0002] Ovens used in tinplate production are primarily for drying passivated steel sheets and for high-temperature curing of the passivation film. This is crucial for the product's corrosion resistance and the quality of subsequent oiling. Traditional ovens suffer from high energy consumption, insufficient temperature uniformity and control precision, low drying efficiency, large footprint, high maintenance costs, and environmental concerns. To adapt to modern high-speed, thin-plate production demands and the requirements of energy conservation and environmental protection, developing more efficient, energy-saving, precisely temperature-controlled, intelligent, environmentally friendly, and compact new oven technologies has become a key issue for industry upgrading.

[0003] A search revealed Chinese Patent Publication No. CN210569601U, which discloses an oven for tinplate production. The oven body includes an oven body with multiple electric heating tubes fixedly connected to the inner wall of the oven body. Both sides of the oven body have first rectangular through holes. A cooling box and a preheating box are fixedly connected to the side walls of the oven body, respectively. The lower surfaces of the cooling box and the preheating box are each fixedly connected to two symmetrically distributed support legs. A waste heat recovery mechanism is fixedly connected to the outer wall of the oven body. A through hole is opened on the upper surface of the oven body, and a temperature control unit is fixedly connected to the wall of the through hole. This invention can effectively improve the energy-saving and environmental protection performance of the oven, while reducing the oven's power consumption, thereby reducing the production cost of tinplate. The patent recycles the heat energy of high-temperature exhaust gas through a waste heat recovery mechanism, significantly reducing overall energy consumption. At the same time, it combines the gradient thermal management design of the cooling box and the preheating box to reduce the power consumption of the electric heating tube, thereby improving energy-saving and environmental protection performance and reducing production costs. However, the patent does not have a zoned flow guiding structure and a two-way air distribution system, which cannot solve the core problem of uneven heating of the board. In addition, the waste heat recovery relies only on external mechanisms and lacks a closed-loop thermal circulation design between the three zones inside the oven, resulting in limited heat reuse efficiency and weak oxidation control. Utility Model Content

[0004] The purpose of this utility model is to provide an oven for tinplate production, which solves the core problem of uneven heating of the plate material, as well as the limited efficiency of heat energy reuse and weak oxidation control.

[0005] To achieve the above objectives, an oven for tinplate production is provided, including a box body. The box body is provided with a preheating zone, a main heating zone, and a heat preservation zone. A partition is fixedly connected between the preheating zone, the main heating zone, and the heat preservation zone. A spacer slot is opened in the middle of each partition.

[0006] An upper V-shaped guide pipe is fixedly connected to the lower end of the top plate of the box, and a lower V-shaped guide pipe is fixedly connected to the upper end of the bottom plate of the box.

[0007] The top and bottom plates of the enclosure are each provided with three heat pipe slots. Several upper heating pipes are fixedly connected to the heat pipe slots in the top plate, and several lower heating pipes are fixedly connected to the heat pipe slots in the bottom plate.

[0008] The lower end of the top plate of the box is fixedly connected to three rows of nitrogen nozzles.

[0009] Several rollers are connected to the inside of the box. The preheating zone has a feed inlet on the right side and the insulation zone has a discharge outlet on the left side.

[0010] An air intake is provided on the upper left side of the insulation zone. A heat transfer pipe is fixedly connected to the top plate of the box, which encompasses the air intake. A fan is fixedly connected to the heat transfer pipe.

[0011] The heat transfer pipe is equipped with a heat-conducting pipe, and the top plate of the preheating zone has several heat transfer ports. The lower end of the heat transfer ports is fixedly connected to the heat pipe groove on the bottom plate of the preheating zone.

[0012] The rear end of the housing is equipped with three centrifugal blowers, and air supply pipes are fixedly connected to the centrifugal blowers and the housing.

[0013] The beneficial effects of this utility model are:

[0014] 1. This oven features a three-zone independent structure consisting of a preheating zone, a main heating zone, and a heat preservation zone. It also incorporates upper and lower V-shaped airflow pipes to achieve bidirectional airflow coverage. Combined with the zoned arrangement of upper and lower heating pipes, the uniformity of heating of the board material is greatly improved, and the lateral temperature difference of the board surface is small. This design effectively avoids the problem of inconsistent melting and crystallization of the tin plating layer caused by uneven temperature in traditional ovens, and eliminates defects such as white fog and black spots.

[0015] 2. This oven utilizes a waste heat recovery system consisting of a suction fan in the insulation zone and heat-conducting pipes inside the heat transfer pipeline to transfer the waste heat of high-temperature exhaust gas to the heat transfer port in the preheating zone, thereby realizing the heat energy of the exhaust gas and reducing overall energy consumption. At the same time, the nitrogen nozzles on the top plate continuously spray nitrogen to create a dynamic low-oxygen environment, controlling the oxygen concentration in the oven to a low level, reducing the oxidation defect rate of the tin layer, and significantly improving the surface gloss and corrosion resistance of the tin-plated plate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an oven for producing tinplate according to the present invention.

[0017] Figure 2 This is a front sectional view of an oven for producing tinplate according to this utility model.

[0018] Figure 3 This is a front view of an oven for producing tinplate according to the present invention.

[0019] Figure 4 This is a side view of an oven for producing tinplate according to the present invention.

[0020] Figure 5 This is a top view of an oven for producing tinplate according to the present invention.

[0021] Legend:

[0022] 1. Suction fan; 2. Discharge port; 3. Roller; 4. Heat transfer pipe; 5. Box body; 6. Feed inlet; 7. Insulation zone; 8. Heat pipe groove; 9. Main heating zone; 10. Baffle; 11. Preheating zone; 12. Upper heating pipe; 13. Upper V-shaped guide pipe; 14. Suction port; 15. Lower V-shaped guide pipe; 16. Heat conduction pipe; 17. Heat transfer port; 18. Nitrogen nozzle; 19. Spacing groove; 20. Lower heating pipe; 21. Air supply pipe; 22. Centrifugal blower. Detailed Implementation

[0023] Reference Figure 1-4 This utility model relates to an oven for tinplate production, which includes a box body 5. The box body 5 is provided with a preheating zone 11, a main heating zone 9 and a heat preservation zone 7. A partition 10 is fixedly connected between the preheating zone 11, the main heating zone 9 and the heat preservation zone 7. A spacer slot 19 is opened in the middle of each partition 10.

[0024] The upper V-shaped guide pipe 13 is fixedly connected to the lower end of the top plate of the box 5, and the lower V-shaped guide pipe 15 is fixedly connected to the upper end of the bottom plate of the box 5. Hot air nozzles are opened on the V-shaped guide pipe 15. The preheating zone 11, the main heating zone 9 and the heat preservation zone 7 are physically separated by the partition 10. The partition groove 19 in the middle allows the plate to pass through continuously, while restricting the mixing of hot air across zones. The centrifugal blower 22 delivers air to each zone through the air supply pipe 21. The upper V-shaped guide pipe 13 and the lower V-shaped guide pipe 15 split the airflow into bidirectional airflow, covering the upper and lower surfaces of the plate.

[0025] The top and bottom plates of the enclosure 5 are each equipped with three heat pipe slots 8. Several upper heating pipes 12 are fixedly connected in the heat pipe slots 8 in the top plate, and several lower heating pipes 20 are fixedly connected in the heat pipe slots 8 in the bottom plate. The preheating zone 11 and the heat preservation zone 7 mainly use the lower heating pipes to compensate for the rising effect of hot air, while the main heating zone mainly uses the upper heating pipes to enhance the melting temperature of solder. Differentiated heating in different zones ensures that there is a certain temperature difference between the top and bottom of the board.

[0026] The bottom of the top plate of the enclosure 5 is fixedly connected with three rows of nitrogen nozzles 18. The nitrogen nozzles 18 spray nitrogen gas curtain into the enclosure from the nitrogen provided by the external liquid nitrogen tank, forming a dynamic isolation layer on the surface of the plate to inhibit the oxidation reaction of the tin layer under high temperature.

[0027] Several rollers 3 are connected inside the box 5. The preheating zone 11 has a feed inlet 6 on the right side and the insulation zone 7 has a discharge outlet 2 on the left side. The rollers 3 have a special surface treatment to reduce contact with the board. The feed inlet 6 and the discharge outlet 2 are combined with an airtight structure to prevent external air from seeping in.

[0028] An air intake 14 is provided on the upper left side of the insulation zone 7. A heat transfer pipe 4 is fixedly connected to the top plate of the box 5. The heat transfer pipe 4 completely encloses the air intake 14. A fan 1 is fixedly connected to the heat transfer pipe 4. The fan 1 draws high-temperature exhaust gas from the insulation zone through the air intake 14 and introduces it into the heat transfer pipe 4 for heat transfer.

[0029] A heat transfer pipe 16 is installed inside the heat transfer pipe 4. Several heat transfer ports 17 are opened on the top plate of the preheating zone 11. The lower end of the heat transfer port 17 is fixedly connected to the heat pipe groove 8 on the bottom plate of the preheating zone 11. The heat transfer pipe 16 realizes physical heat exchange between the exhaust gas and the fresh air in the heat transfer pipe 4. The preheated gas is introduced into the preheating zone for recycling through the heat transfer port 17.

[0030] Three centrifugal blowers 22 are installed at the rear end of the housing 5. Air supply pipes 21 are fixedly connected to the centrifugal blowers 22 and the air supply pipes 21 are fixedly connected to the housing 5. The three centrifugal blowers 22 deliver air to each temperature zone through independent air supply pipes 21 to match the heat load requirements of different temperature zones.

[0031] During use, the operator feeds the sheet material through the inlet 6 via roller 3 into the preheating zone 11, main heating zone 9, and insulation zone 7. The centrifugal blower 22 injects airflow into the housing 5 through the air supply pipe 21. The upper V-shaped guide pipe 13 and lower V-shaped guide pipe 15 divert the airflow and guide it to the upper and lower sides of the sheet surface. The lower heating pipe 20 and upper heating pipe 12 within the housing 5 heat the gas in separate zones, causing the sheet material to gradually increase in temperature from 120℃ to 280℃ and then slowly decrease to 220℃. The nitrogen nozzle 18 sprays nitrogen to form a nitrogen curtain, maintaining a low-oxygen environment and reducing tin layer oxidation. The suction fan 1 in the insulation zone 7 draws air through the suction port 14. High-temperature exhaust gas is drawn in and transferred to the heat transfer port 17 of the preheating zone 11 via the heat transfer pipe 16 in the heat transfer pipe 4. The preheating heat pipe trough 8 is preheated. This oven adopts a three-zone independent structure with a zoned heating design of preheating zone 11, main heating zone 9 and heat preservation zone 7. Combined with the upper and lower V-shaped guide pipes, it achieves bidirectional uniform air distribution, effectively avoiding the problem of uneven heating of the board. At the same time, the nitrogen injection system continuously maintains a low-oxygen environment in the oven, which significantly inhibits the oxidation of the tin layer. The high-temperature heat energy of the heat preservation zone 7 is transferred to the preheating zone 11 for recycling through the exhaust gas waste heat recovery device, achieving the dual optimization of high efficiency and energy saving and improved coating quality.

Claims

1. An oven for producing tinplate, characterized in that, Includes a box body (5), which is provided with a preheating zone (11), a main heating zone (9) and a heat preservation zone (7). A partition (10) is fixedly connected between the preheating zone (11), the main heating zone (9) and the heat preservation zone (7). A spacer slot (19) is opened in the middle of each partition (10). The upper V-shaped guide pipe (13) is fixedly connected to the lower end of the top plate of the box (5), and the lower V-shaped guide pipe (15) is fixedly connected to the upper end of the bottom plate of the box (5).

2. The oven for tinplate production according to claim 1, characterized in that, The top and bottom plates of the box body (5) are each provided with three heat pipe grooves (8). Several upper heating pipes (12) are fixedly connected in the heat pipe grooves (8) in the top plate, and several lower heating pipes (20) are fixedly connected in the heat pipe grooves (8) in the bottom plate.

3. The oven for tinplate production according to claim 1, characterized in that, The lower end of the top plate of the box (5) is fixedly connected with three rows of nitrogen nozzles (18).

4. The oven for tinplate production according to claim 1, characterized in that, The box (5) is connected to several rollers (3) in a rolling manner. The preheating zone (11) has a feed inlet (6) on the right side and the insulation zone (7) has a discharge outlet (2) on the left side.

5. The oven for tinplate production according to claim 1, characterized in that, An air intake (14) is provided on the upper left side of the insulation zone (7). A heat transfer pipe (4) is fixedly connected to the top plate of the box (5). The heat transfer pipe (4) completely encloses the air intake (14). A fan (1) is fixedly connected to the heat transfer pipe (4).

6. The oven for tinplate production according to claim 5, characterized in that, The heat transfer pipe (4) is provided with a heat conduction pipe (16), and the top plate of the preheating zone (11) is provided with a number of heat transfer ports (17). The lower end of the heat transfer port (17) is fixedly connected to the heat pipe groove (8) on the bottom plate of the preheating zone (11).

7. The oven for tinplate production according to claim 1, characterized in that, The rear end of the housing (5) is equipped with three centrifugal blowers (22), and an air supply pipe (21) is fixedly connected to the centrifugal blower (22). The air supply pipe (21) is fixedly connected to the housing (5).

Images