Temperature control device for continuous hot galvanizing of steel strip

Abstract

The utility model discloses a temperature control device for continuous hot galvanizing of a steel belt, and relates to the technical field of galvanizing processing, the temperature control device comprises a furnace body and a zinc pot, the zinc pot is arranged in the furnace body, the inner side wall of the furnace body is provided with a heating assembly used for heating the zinc pot, the heating assembly comprises a gas pipeline, and the gas pipeline is arranged between the furnace body and the zinc pot and is communicated with the furnace body. The middle of the zinc pot is connected with a gas inlet section used for being communicated with external natural gas; the burners are arranged on the gas pipeline and are arranged around the outer side wall of the zinc pot at intervals; and the electromagnetic valve is in fluid communication with the fire nozzle. According to the utility model, the zinc liquid in the zinc pot can be rapidly heated to a preset temperature, and when the zinc liquid reaches the preset temperature, the opening degree of the burner is reduced to keep the zinc liquid warm, so that the automatic and accurate control of the temperature of the zinc liquid is realized, the galvanizing quality is ensured, the consumption of fuel gas is saved, and the purposes of energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of galvanizing processing, in particular to a temperature control device for continuous hot-dip galvanizing of steel strips. Background Technique

[0002] Hot-dip galvanizing, also known as hot-dip zinc plating and hot-dip galvanizing, is mainly used for the anti-corrosion treatment of steel structure parts. After rust removal, the steel parts are immersed in molten zinc at about 500 °C, so that a zinc layer adheres to the surface of the steel components, thereby achieving the purpose of anti-corrosion. The temperature control of the zinc bath has a direct impact on the quality of galvanizing. When the temperature of the hot-dip galvanizing zinc bath rises, it will promote the thickening of the Fe-Zn alloy layer and the formation of Fe2Al5 scum. When the temperature of the hot-dip galvanizing zinc bath is below 480 °C, the iron loss changes according to the parabolic law, and with the increase of temperature, the iron loss increases little. When the temperature of the hot-dip galvanizing zinc bath exceeds 480 °C, the iron loss increases sharply with the increase of the zinc bath temperature according to the linear law, and the Fe-Zn alloy layer also thickens sharply, seriously affecting the adhesion of the coating. Therefore, the temperature of the hot-dip galvanizing zinc bath should be stably controlled at a certain temperature value between 450-470 °C according to the thickness of the strip.

[0003] Due to the high viscosity characteristics of the zinc bath, the fluidity is poor, resulting in low heat conduction efficiency in the zinc pot. The traditional two-end heating method cannot effectively achieve uniform heating of the zinc bath throughout the zinc pot. Especially in the middle area of the zinc pot, due to being far from the heat source, the temperature of the zinc bath is often low. This problem of uneven temperature distribution not only affects the stability of the galvanizing process, but also may lead to uneven surface quality of the galvanized sheet, such as color differences and uneven thickness. When the temperature difference of the zinc bath in the zinc pot is large, iron ions in the zinc bath with a higher temperature are prone to precipitate from the zinc bath during the cooling process. These precipitated iron ions react with the aluminum element in the zinc bath to form zinc slag. The formation of zinc slag not only causes waste of zinc resources, but also has a negative impact on the production of galvanized sheets. On the one hand, zinc slag will adhere to the galvanized sheet, resulting in a decrease in the surface quality of the galvanized sheet, and in severe cases, even lead to the downgrading of the galvanized sheet; on the other hand, the cleaning and treatment of zinc slag also require additional costs and human resources, increasing the production cost.

[0004] In view of this, this application is specifically proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a temperature control device for continuous hot-dip galvanizing of steel strips to solve the problems raised in the above background technique.

[0006] To solve the above technical problems, a temperature control device for continuous hot-dip galvanizing of steel strips provided by the utility model includes: a furnace body and a zinc pot. The zinc pot is arranged inside the furnace body. A heating component for heating the zinc pot is installed on the inner side wall of the furnace body. The heating component includes,

[0007] A gas pipeline is provided between the furnace body and the zinc pot, surrounding the zinc pot, and an intake section for connecting to external natural gas is connected to the middle thereof;

[0008] Burners are provided on the gas pipeline and arranged at intervals around the outer side wall of the zinc pot;

[0009] A solenoid valve is in fluid communication with the burner;

[0010] A transmission assembly for pushing the zinc pot to reciprocate in its length direction is further provided on the side wall of the zinc pot. When the zinc pot reciprocates inside the furnace body, the corresponding positions of the side wall of the zinc pot and the burner change.

[0011] Further, the transmission assembly includes,

[0012] A fixed rod is connected to the side wall of the upper part of the zinc pot, and a movable rod is rotatably connected to the end thereof away from the zinc pot. A driven pin is fixedly installed at the bottom end of the movable rod;

[0013] A rotating rod can rotate around its own axis, and a turntable is fixedly installed on the outer wall thereof. A pin slot for inserting the driven pin is provided on the top surface of the turntable.

[0014] Further, the zinc pot includes a pot wall and an extension edge. The pot wall is arranged inside the furnace body, and the extension edge extends outward along the top wall of the pot wall. The extension edge overlaps on the top wall of the furnace body.

[0015] Further, a gap is provided between the pot wall and the furnace body, and the heating assembly is arranged in the gap between the pot wall and the furnace body.

[0016] Further, a temperature sensor for detecting the temperature of the zinc liquid inside the pot wall is further installed on the side wall of the pot wall, and a controller for controlling the opening degree of the solenoid valve according to the zinc liquid temperature detected by the temperature sensor is further installed on the outer wall of the furnace body.

[0017] Further, the furnace body is made of refractory bricks, the furnace body is of a rectangular structure, and the height of the side wall of the furnace body is greater than the height of the pot wall.

[0018] Further, a flow disturbing assembly is further provided on the bottom surface of the furnace body. The flow disturbing assembly includes,

[0019] A rack is installed on the bottom surface of the furnace body and is parallel to the length direction of the furnace body;

[0020] A rotating shaft is rotatably installed in the middle of the bottom surface of the pot wall. The bottom end of the rotating shaft extends below the pot wall and is provided with a gear meshing with the rack. The top end of the rotating shaft extends into the pot wall and is provided with flow disturbing blades.

[0021] Furthermore, a support rod is connected to the non-tooth surface of the rack. There are two support rods arranged symmetrically, and the end of the support rod away from the rack is fixedly connected to the inner side wall of the furnace body.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] 1. In the present utility model, natural gas or coal gas is provided to the burner through a gas pipeline. The spacing between the burners should be approximately the same to ensure uniform heating of the zinc pot. The solenoid valve is in fluid communication with the burner, and the temperature sensor contacts the zinc pot to detect the temperature of the zinc pot. The controller controls the opening degree of the solenoid valve according to the temperature of the zinc liquid detected by the temperature sensor according to a preset value, so as to control the size of the flame of the burner to achieve the purpose of controlling the temperature of the zinc pot, thereby realizing automatic and precise control of the zinc liquid temperature, ensuring the quality of galvanizing, and saving the consumption of gas.

[0024] 2. In the present utility model, an external driving device is connected through a rotating rod to make the rotating rod rotate. The rotating rod drives the turntable to rotate. The distance between the inner wall of the pin slot and the axis of the rotating rod increases or decreases in the rotation direction in turn. Therefore, when the turntable rotates, it can push the movable rod and the fixed rod to drive the zinc pot to perform a linear reciprocating motion. During the movement of the zinc pot on the furnace body, its side wall can alternately contact the spaced burners, thereby ensuring the uniformity of heating the zinc pot by the burners.

[0025] 3. In the present utility model, the transmission component can drive the zinc pot to perform a horizontal reciprocating displacement on the furnace body. During the movement of the zinc pot, it will drive the rotating shaft and the gear to move synchronously. When the gear moves, it will engage with the rack, and then the gear can drive the rotating shaft and the turbulence blade to rotate, so that the zinc liquid in the zinc pot remains in a slow-flowing state, maintaining the uniformity of the temperature and composition of the zinc liquid in the zinc pot, and reducing the generation of zinc slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the front view structural schematic diagram of the present utility model;

[0027] Figure 2 is the bottom view structural schematic diagram of the present utility model;

[0028] Figure 3 is the sectional view structural schematic diagram of the present utility model;

[0029] Figure 4 is the structural schematic diagram of the heating component in the present utility model.

[0030] In the figure: 1. Furnace body; 2. Zinc pot; 21. Pot wall; 22. Extension edge; 3. Heating component; 31. Gas pipeline; 32. Intake section; 33. Burner; 34. Solenoid valve; 4. Transmission component; 41. Fixed rod; 42. Movable rod; 43. Driven pin; 44. Rotating rod; 45. Turntable; 5. Flow disturbance component; 51. Support rod; 52. Rack; 53. Rotating shaft; 54. Gear; 55. Flow disturbance blade; 6. Temperature sensor. Detailed implementation mode

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-4 , the present invention provides a technical solution: a temperature control device for continuous hot-dip galvanizing of steel strips, including: a furnace body 1 and a zinc pot 2. The zinc pot 2 is arranged in the furnace body 1. A heating component 3 for heating the zinc pot 2 is installed on the inner side wall of the furnace body 1. The heating component 3 includes,

[0033] A gas pipeline 31 is arranged between the furnace body 1 and the zinc pot 2, surrounding the zinc pot 2, and an intake section 32 for connecting to external natural gas is connected in the middle thereof;

[0034] Burners 33 are arranged on the gas pipeline 31 and are arranged at intervals around the outer side wall of the zinc pot 2;

[0035] A solenoid valve 34 is in fluid communication with the burner 33;

[0036] A transmission component 4 for pushing the zinc pot 2 to reciprocate along its length direction is further arranged on the side wall of the zinc pot 2. When the zinc pot 2 reciprocates inside the furnace body 1, the corresponding positions of the side wall of the zinc pot 2 and the burner 33 change.

[0037] It should be noted that: a temperature sensor 6 for detecting the temperature of the zinc liquid inside the pot wall 21 is further installed on the side wall of the pot wall 21, and a controller for controlling the opening degree of the solenoid valve 34 according to the zinc liquid temperature detected by the temperature sensor 6 is further installed on the outer wall of the furnace body 1.

[0038] Specifically, the intake section 32 supplies natural gas or coal gas to the gas pipeline 31, and the gas pipeline 31 supplies it to the burner 33. The spacing distances of the burners 33 should be approximately the same to ensure uniform heating of the zinc pot 2. The solenoid valve 34 is in fluid communication with the burner 33. The temperature sensor 6 contacts the zinc pot 2 to detect the temperature of the zinc pot 2. The controller correspondingly controls the opening degree of the solenoid valve 34 according to the zinc liquid temperature detected by the temperature sensor 6 to control the size of the flame of the burner 33 so as to achieve the purpose of controlling the temperature of the zinc pot 2. When the temperature of the zinc pot 2 reaches the preset high temperature value, the solenoid valve 34 reduces the opening degree to reduce the gas supply to the burner 33. When the temperature of the zinc pot 2 reaches the preset low temperature value, the solenoid valve 34 increases the opening degree to increase the gas supply to the burner 33.

[0039] Refer to Figure 1 , the transmission assembly 4 includes,

[0040] The fixed rod 41 is connected to the side wall of the upper part of the zinc pot 2, and a movable rod 42 is rotatably connected to the end thereof away from the zinc pot 2. A driven pin 43 is fixedly installed at the bottom end of the movable rod 42;

[0041] The rotating rod 44 can rotate around its own axis, and a turntable 45 is fixedly installed on its outer wall. A pin slot for inserting the driven pin 43 is provided on the top surface of the turntable 45.

[0042] Specifically, the rotating rod 44 is connected to an external driving device to make the rotating rod 44 rotate. The rotating rod 44 drives the turntable 45 to rotate. The distance between the inner wall of the pin slot and the axis of the rotating rod 44 increases or decreases in sequence in the rotation direction. Furthermore, when the turntable 45 rotates, it can push the movable rod 42 and the fixed rod 41 to drive the zinc pot 2 to perform a linear reciprocating motion. During the movement of the zinc pot 2 on the furnace body 1, its side wall can alternately contact the spaced burners 33, thereby ensuring the uniformity of heating of the zinc pot 2 by the burners 33.

[0043] Refer to Figure 2 , the zinc pot 2 includes a pot wall 21 and an extension edge 22. The pot wall 21 is arranged inside the furnace body 1, and the extension edge 22 extends outward along the top wall of the pot wall 21 and overlaps on the top wall of the furnace body 1.

[0044] Refer to Figure 3 , there is a gap between the pot wall 21 and the furnace body 1, and the heating assembly 3 is arranged in the gap between the pot wall 21 and the furnace body 1.

[0045] Refer to Figure 1 and Figure 3 , the furnace body 1 is made of refractory bricks, the furnace body 1 has a rectangular structure, and the height of the side wall of the furnace body 1 is greater than the height of the pot wall 21.

[0046] Specifically, the furnace body 1 made of refractory bricks has the advantages of high temperature resistance and good heat preservation effect.

[0047] Refer to Figure 2 and Figure 3 , it further includes a flow disturbance component 5 arranged on the bottom surface of the furnace body 1. The flow disturbance component 5 includes

[0048] a rack 52, installed on the bottom surface of the furnace body 1, which is parallel to the length direction of the furnace body 1;

[0049] a rotating shaft 53, rotatably installed in the middle of the bottom surface of the pot wall 21. The bottom end of the rotating shaft 53 extends below the pot wall 21 and is provided with a gear 54 meshing with the rack 52. The top end of the rotating shaft 53 extends into the pot wall 21 and is provided with a flow disturbance blade 55;

[0050] Specifically, the zinc pot 2 can be driven by the transmission component 4 to horizontally reciprocate on the furnace body 1. During the movement of the zinc pot 2, the rotating shaft 53 and the gear 54 will move synchronously. When the gear 54 moves, it will mesh with the rack 52, and then the gear 54 can drive the rotating shaft 53 and the flow disturbance blade 55 to rotate, so that the zinc liquid in the zinc pot 2 keeps flowing slowly, maintaining the uniformity of the temperature and composition of the zinc liquid in the zinc pot 2, and reducing the generation of zinc slag.

[0051] Refer to Figure 2 , a support rod 51 is connected to the non-tooth surface of the rack 52. There are two support rods 51 arranged symmetrically. One end of the support rod 51 away from the rack 52 is fixedly connected to the inner side wall of the furnace body 1.

[0052] Specifically, the stability of the installation of the rack 52 can be improved by the provided support rod 51.

Claims

1. A temperature control device for continuous hot-dip galvanizing of a steel strip, comprising: A furnace body (1) and a zinc pot (2), wherein the zinc pot (2) is arranged in the furnace body (1), characterized in that a heating component (3) for heating the zinc pot (2) is installed on the inner side wall of the furnace body (1), and the heating component (3) comprises: A gas pipeline (31) is provided between the furnace body (1) and the zinc pot (2), surrounds the zinc pot (2), and is connected in the middle with a gas inlet section (32) for connecting with external natural gas; Burners (33) are provided on the gas pipeline (31) and are arranged at intervals around the outer wall of the zinc pot (2); a solenoid valve (34) in fluid communication with the burner (33); A transmission assembly (4) for pushing the zinc pot (2) to reciprocate along its length direction is also provided on the side wall of the zinc pot (2); when the zinc pot (2) reciprocates inside the furnace body (1), the corresponding positions of the side wall of the zinc pot (2) and the burner (33) change.

2. A temperature control device for continuous hot-dip galvanizing of steel strip according to claim 1, characterized in that: The transmission assembly (4) comprises: A fixed rod (41) is connected to the side wall of the upper part of the zinc pot (2), and one end of the fixed rod (41) away from the zinc pot (2) is rotatably connected to a movable rod (42), and a driven pin (43) is fixedly installed at the bottom end of the movable rod (42); The rotating rod (44) can rotate around its own axis, and a rotating disk (45) is fixedly installed on its outer wall. The top surface of the rotating disk (45) is provided with a pin groove for the driven pin (43) to be inserted.

3. A temperature control device for continuous hot-dip galvanizing of steel strip according to claim 1, characterized in that: The zinc pot (2) comprises a pot wall (21) and an extended edge (22); the pot wall (21) is arranged inside the furnace body (1); the extended edge (22) is extended outward along the top wall of the pot wall (21); and the extended edge (22) overlaps the top wall of the furnace body (1).

4. A temperature control device for continuous hot-dip galvanizing of steel strip as claimed in claim 3, characterized in that: The pot wall (21) and the furnace body (1) are arranged at a distance, and the heating component (3) is arranged in the distance between the pot wall (21) and the furnace body (1).

5. A temperature control device for continuous hot-dip galvanizing of steel strip as claimed in claim 3, characterized in that: A temperature sensor (6) for detecting the temperature of the zinc liquid inside the pot wall (21) is also installed on the side wall of the pot wall (21), and a controller for controlling the opening of the solenoid valve (34) according to the zinc liquid temperature detected by the temperature sensor (6) is also installed on the outer wall of the furnace body (1).

6. A temperature control device for continuous hot-dip galvanizing of steel strip as claimed in claim 3, characterized in that: The furnace body (1) is built of refractory bricks, the furnace body (1) is in a rectangular structure, and the height of the side wall of the furnace body (1) is greater than the height of the pot wall (21).

7. A temperature control device for continuous hot-dip galvanizing of steel strip as claimed in claim 3, characterized in that: It also includes a spoiler assembly (5) arranged on the bottom surface of the furnace body (1), and the spoiler assembly (5) includes: A rack (52) is mounted on the bottom surface of the furnace body (1) and is parallel to the length direction of the furnace body (1); A rotating shaft (53) is rotatably mounted in the middle of the bottom surface of the pot wall (21); the bottom end of the rotating shaft (53) extends below the pot wall (21) and is mounted with a gear (54) meshing with the rack (52); the top end of the rotating shaft (53) extends into the interior of the pot wall (21) and is mounted with a spoiler blade (55).

8. A temperature control device for continuous hot-dip galvanizing of steel strip as claimed in claim 7, characterized in that: The non-toothed surface of the rack (52) is connected to a support rod (51), two support rods (51) are symmetrically arranged, and one end of the support rod (51) away from the rack (52) is fixedly connected to the inner wall of the furnace body (1).

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