CN117387314A - A thin slab continuous casting mold drying method - Google Patents

Abstract

The invention discloses a drying method for a thin slab continuous casting crystallizer. The thin slab continuous casting crystallizer with a drying device is used for drying. The crystallizer body is divided into several independent cavities by a mounting frame. The length of the crystallizer body is A first crystallizer copper plate and a second crystallizer copper plate are provided on both sides in the direction, and a first baffle and a second baffle are provided on both sides in the width direction. The bottom of the crystallizer body is composed of the top surface of the dummy rod device. The crystallizer body There is an upper cover on the top; there is a microwave antenna installation room on the top of each cavity, and there are side gas collection rooms connected with it on the side of the microwave antenna installation room; between the two microwave antenna installation rooms at the lateral center of the installation frame There is an intermediate gas collection chamber connected with each cavity. The intermediate gas collection chamber is connected with the side gas collection chamber. There is a gas channel on the top of the intermediate gas collection chamber. The crystallizer body is equipped with an exhaust device connected with the gas channel. The collected gas is discharged, and the drying efficiency is high in a smaller cavity.

Description

A thin slab continuous casting mold drying method

Technical field

The invention relates to the field of thin slab continuous casting equipment, and in particular to a thin slab continuous casting mold drying method.

Background technique

The thin slab continuous casting mold is a continuous casting equipment that casts molten steel into thin slabs. The thin slab continuous casting machine needs to be inspected before casting after maintenance or before casting at intervals, and the mold grid must be inspected. Thoroughly clean the residual steel and slag deposits on the grid and surface, and flush with production water if necessary. After confirming that the corner seams of the crystallizer are up to standard, immediately turn on the mist exhaust fan to discharge the moisture, and then polish the surface of the crystallizer and dry it before applying the graphite coating. .

When drying the surface of the crystallizer, one or more iodine tungsten lamps are usually placed above the crystallizer to bake until there is no moisture remaining on the surface of the crystallizer. Ensure that the graphite coating is dry and that there is no moisture in the crystallizer. . However, it takes at least 10-15 minutes to dry the moisture on the surface of the crystallizer and the graphite coating using the above method. The drying time is long and the drying effect is poor. It is easy to cause molten steel splash accidents during the casting of molten steel, which may cause damage to people around the pouring operation. There are major safety hazards, and in severe cases, surrounding equipment may be damaged, resulting in a sharp increase in the number of injured persons. Therefore, in order to reduce operating risks and improve the intrinsic safety of equipment, a thin slab continuous casting mold with a drying device is urgently needed.

Contents of the invention

The invention provides a thin slab continuous casting mold drying method, which aims to shorten the drying time of the crystallizer surface moisture and graphite coating, improve the drying effect, and ensure the safe and smooth casting production.

The invention is a thin slab continuous casting crystallizer drying method. The thin slab continuous casting crystallizer includes a crystallizer body. The crystallizer body is provided with a time relay, a main power start switch, a main power stop switch, and an emergency stop switch. and sound and light alarm; the crystallizer body is divided into several independent cavities by the mounting frame. There are first crystallizer copper plates and second crystallizer copper plates on both sides of the length direction of the mounting frame, and first baffles are provided on both sides of the width direction. and a second baffle, an upper cover is provided on the top of the crystallizer body; a microwave antenna installation chamber is provided on the top of each cavity, a microwave antenna is provided in the microwave antenna installation chamber, and a microwave antenna protective cover is provided on the top of the microwave antenna installation chamber. The sides of the microwave antenna installation chambers are equipped with edge gas collection chambers that communicate with them; at the lateral center of the installation frame, there is an intermediate gas collection chamber between the two microwave antenna installation chambers that communicates with each cavity. The internal gas collection chamber is connected through the edge gas collection channel, and a gas channel is provided at the center of the mounting frame; an exhaust device is connected to the crystallizer body, and the exhaust device is connected to the gas channel through the mounting hole. The exhaust device includes a fan impeller. , there is an exhaust hood above the fan impeller, the exhaust hood includes a gas capture cover, a gas collection chamber is provided on the top of the gas capture cover, and a number of hole-shaped exhaust ports are provided on the side of the gas collection chamber; the drying method includes Following steps:

Step 1: First turn on the main power start switch of the crystallizer body, check that the signals of all sensors and controllers are normal and the corresponding signal display light group lights up, then turn on the microwave antenna;

Step 2: Set the drying time on the time relay of the crystallizer body. Use the microwave antenna controller to control the microwave antenna to emit microwave signals for drying. When the set time is reached, it will automatically stop and send out an audible and visual alarm through the crystallizer body. End signal; during the drying process, the temperature and humidity in the air collection chamber are detected in real time to determine whether the moisture in the crystallizer body is dried. If the drying condition is not good, the output power of the microwave antenna and the speed of the fan impeller are increased. until dry.

Preferably, the mounting bracket is provided with baffle mounting holes symmetrically in the width direction, and the first baffle and the second baffle are provided with baffle bayonet fittings that match the baffle mounting holes; the outer sides of the first baffle and the second baffle are Features fender carry handle.

Preferably, the installation frame is in a special shape, and an isolation vertical plate is provided in the middle of the outside of the installation frame. Several asymmetric first drying chambers and second drying chambers are separated by the isolation vertical plates.

Preferably, the four corners of the top of the mounting bracket are symmetrically provided with connecting portions extending to the outside of the mounting bracket. The connecting portion is provided with positioning holes. The first mold copper plate and the second mold copper plate are connected to the mounting bracket through positioning pins inserted into the positioning holes. connect.

Preferably, a lifting hole is provided on the side of the connecting part close to the microwave antenna protective cover.

Preferably, an absorbent cotton installation chamber is provided on the crystallizer body adjacent to the exhaust port, and absorbent cotton is disposed transversely in the absorbent cotton installation chamber.

Preferably, the angles of the special-shaped bracket at the bottom of the mounting frame are: ∠a=101.35°, ∠b=168.65°, ∠c=172.42°, ∠d=82.42°, ∠e=172.41°, ∠f=168.69°, ∠g=16.70°, ∠h=16.70°.

Preferably, the intermediate gas collection chamber is in the shape of a mesh.

Preferably, the direction of the transmitting antenna of the microwave antenna is aligned with the inside of the microwave antenna installation room.

Preferably, the sensor includes a first position sensor located at all baffle mounting holes, a second position sensor located at all positioning holes, a first temperature sensor located at all microwave antenna protective covers, and a first temperature sensor located at the gas collection chamber. The second temperature sensor and humidity sensor on the top and the speed controller that controls the fan impeller. The first position sensor, the second position sensor and the speed controller are respectively electrically connected to the signal input end of the signal display lamp group. The signal of the signal display lamp group The output terminal is electrically connected to the signal input terminal of the microwave antenna controller. The first temperature sensor, the second temperature sensor and the humidity sensor are respectively electrically connected to the signal input terminal of the microwave antenna controller. The signal output terminal of the microwave antenna controller is connected to the microwave antenna. Electrical connection.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The present invention uses a thin slab continuous casting crystallizer of a specific drying device for drying. The crystallizer is divided into independent small cavities through a mounting frame. The small cavities meet the needs of low-power microwave heating. When microwaves encounter metal, they generate Reflection, the microwave utilization rate is improved in a smaller cavity. According to the characteristics of microwave heating, water molecules oscillate rapidly at a frequency of 2450MHz. High-speed friction between water molecules generates heat. The generated water vapor passes through the exhaust device set on the crystallizer body. The gas hood is discharged from the outside of the crystallizer. The entire drying process lasts for 3-5 minutes, and the drying efficiency is high.

2. In the crystallizer drying device of the present invention, a microwave antenna installation chamber and an edge gas collection chamber are provided at the upper part of each cavity. The gas in each small cavity is uniformly collected into the exhaust hood, and then passes through the exhaust hood. The gas collecting chamber inside the cover is discharged to the outside. The gas is discharged through the exhaust port. A small amount of condensed water generated by the exhaust port is absorbed by absorbent cotton to prevent the condensed water from flowing into the copper plate inside the crystallizer. Moreover, there is a second temperature sensor and a humidity sensor on the top of the gas collection chamber to detect the temperature and humidity in the gas collection chamber in real time to determine whether the moisture in the crystallizer body is dried. If the drying condition is not good, the microwave antenna is adjusted in time. Output power and fan impeller speed until drying.

3. The microwave antenna installation chamber of the present invention is equipped with a microwave antenna protective cover on the top to prevent damage or contamination of the microwave antenna caused by external force or other pollutants. The exhaust hood is provided with a gas capture cover to facilitate maintenance, and the middle gas collection chamber is The mesh shape not only facilitates the inhalation of gas, but also prevents debris from entering the air duct and causing blockage of the exhaust system.

4. The microwave antenna of the present invention is independently controlled by each microwave antenna controller. The microwave antenna controller specifically has independent start and stop operation buttons, independent power adjustment buttons and display functions, so that the microwave power output can be adjusted in time according to different on-site conditions. . And the crystallizer drying device is connected with an emergency stop switch to prevent electric shock caused by leakage of the device.

5. The direction of the microwave antenna transmitting antenna of the present invention is aligned with the inside of the microwave antenna installation room, which not only prevents personnel from being radiated due to microwave leakage, but also makes better use of the small space cavity to dry the crystallizer in the shortest time. The moisture on the copper plate improves drying efficiency.

6. The exhaust process of the present invention is to drive the motor to drive the fan impeller to rotate. The suction force generated by the impeller extracts the gas in the gas channel and sends it to the exhaust hood. It is captured by the gas capture cover of the exhaust hood and sent to the internal gas collection. chamber, and finally discharged through the exhaust port in a directional manner to prevent the high-temperature gas generated from injuring people. According to the actual amount of moisture on site and the thickness of the graphite layer, the output power of the microwave antenna is adjusted, and the amount of gas discharged increases. When it is necessary to adjust the exhaust speed, adjust the speed of the drive motor.

7. The four corners of the top of the mounting frame of the present invention are symmetrically provided with connecting parts, and the connecting parts are provided with positioning holes. The first copper plate of the crystallizer and the second copper plate of the mold are connected to the mounting frame through positioning pins inserted into the positioning holes, and the connection is tight. , and there is a recessed lifting hole on the side of the connecting part close to the installation frame, which is convenient for operators to operate during installation, and is not limited by space when lifting.

8. The microwave antenna of the present invention adopts the transmitting antenna of a civilian microwave oven, so there is no need to redesign the high-power transmitting antenna and drive circuit. The production cost is low and the technology is mature. Once a failure occurs, consumables are convenient to purchase and the maintenance time is greatly shortened.

9. The lower part of the mounting bracket of the present invention is a special-shaped bracket. The special-shaped bracket has specially designed angle requirements. On the one hand, it ensures that the mounting bracket has sufficient strength. On the other hand, the generated inclined surface can ensure sufficient reflection efficiency, further speeding up the installation process. Drying efficiency.

Description of the drawings

Figure 1 is an exploded view of the thin slab continuous casting mold drying method of the present invention;

Figure 2 is a schematic structural diagram of the thin slab continuous casting mold drying method of the present invention;

Figure 3 is an isometric view of the mounting frame of the present invention;

Figure 4 is a front view of the thin slab continuous casting mold drying method of the present invention;

Figure 5 is a top view of Figure 4;

Figure 6 is a left view of Figure 4;

Figure 7 is a front view of the exhaust hood of the present invention;

Figure 8 is a top view of Figure 7;

Figure 9 is a left view of Figure 7;

Figure 10 is a isometric view of the exhaust hood of the present invention;

Figure 11 is a schematic structural diagram of the mounting bracket of the present invention;

Figure 12 is a schematic diagram of the interlocking operation of the thin slab continuous casting mold drying method of the present invention;

In the picture: 1-mounting frame; 101-baffle mounting hole; 102-special-shaped bracket; 103-first drying room; 104-isolation vertical plate; 105-second drying room; 106-positioning hole; 107-lifting hole; 108-side gas collection chamber; 109-side gas collection channel; 1010-middle gas collection room; 1011-installation hole; 1012-gas channel; 1013-absorbent cotton installation room; 1014-microwave antenna installation room; 2-No. One mold copper plate; 3-the second crystallizer copper plate; 301-positioning pin; 4-first baffle; 5-second baffle; 501-baffle handle; 502-baffle bayonet; 6-upper cover ; 7-Microwave antenna; 8-Microwave antenna protective cover; 9-Absorbent cotton; 10-Fan impeller; 11-Driving motor; 12-Exhaust hood; 1201-Gas collection chamber; 1202-Exhaust port; 1203-Gas capture Cover; 13-first sensor; 14-second sensor; 15-microwave antenna cable; 16-first temperature sensor; 17-second temperature sensor; 18-humidity sensor; 20-first microwave antenna controller; 21 - The second microwave antenna controller; 22 - The third microwave antenna controller; 23 - The fourth microwave antenna controller; 24 - Speed controller; 25 - Signal display light group; 26 - Time relay; 27 - Main power stop switch ; 28-Main power start switch; 29-Emergency stop switch; 30-Audio and visual alarm.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings:

As shown in Figures 1-12, the present invention is a thin slab continuous casting crystallizer drying method. The thin slab continuous casting crystallizer includes a crystallizer body. The crystallizer body is provided with a time relay 26 and a main power start switch. 28. Main power stop switch 27, emergency stop switch 29 and sound and light alarm 30. The crystallizer body is divided into two independent cavities by the mounting frame 1. The first crystallizer copper plate 2 is provided on both sides of the mounting frame 1 in the length direction. and the second crystallizer copper plate 3. There are first baffles 4 and second baffles 5 on both sides in the width direction (the first baffle 4 and the second baffle 5 can also be crystallizer copper plates). The bottom of the crystallizer body is composed of It consists of the top surface of the dummy rod device (existing technology, not shown in the figure), and an upper cover 6 is provided on the top of the crystallizer body. The four corners of the top of the mounting frame 1 are symmetrically provided with connecting portions extending to the outside of the mounting frame 1. The connecting portion is provided with positioning holes 106. The first mold copper plate 2 and the second mold copper plate 3 pass through positioning pins inserted into the positioning holes 106. 301 is connected to the mounting bracket 1; the positioning holes 106 are connected to the second position sensor 14, the mounting bracket 1 is symmetrically provided with baffle mounting holes 101 on both sides in the width direction, and the first baffle 4 and the second baffle 5 are provided with A baffle bayonet 502 that matches the baffle mounting hole 101; a baffle handle 501 is provided on the outside of the first baffle 4 and the second baffle 5, and the first position sensor 13 is connected to the baffle mounting hole 101. , a microwave antenna installation room 1014 is provided at the top of each cavity, a microwave antenna 7 is provided in the inner cavity of the microwave antenna installation room 1014, a microwave antenna protective cover 8 is provided at the top of the microwave antenna installation room 1014, and the transmitting antenna direction of the microwave antenna 7 is opposite Inside the quasi-microwave antenna installation room 1014, a first temperature sensor 16 is provided on the microwave antenna protective cover 8. The signal input end of the microwave antenna 7 and the first temperature sensor 16 is electrically connected through a microwave antenna cable 15, and the connection part is close to the microwave antenna. The protective cover 8 is provided with a lifting hole 107 on one side, and the sides of the microwave antenna installation chamber 1014 are provided with edge gas collection chambers 108 connected thereto; the horizontal center of the installation frame 1 is between the two microwave antenna installation chambers 1014 and each cavity. The interconnected mesh-shaped intermediate gas collection chamber 1010 is connected to the edge gas collection chamber 108 through the edge gas collection channel 109. A gas channel 1012 is provided at the center of the mounting frame 1; an exhaust gas is connected to the crystallizer body. device, the exhaust device is connected with the gas channel 1012 through the mounting hole 1011. The exhaust device includes a fan impeller 10 driven by a drive motor 11. The fan impeller 10 is controlled by a speed controller 24; an exhaust hood 12 is provided above the fan impeller 10. The exhaust hood 12 includes a gas capture cover 1203. A gas collection chamber 1201 is provided on the top of the gas capture cover 1203. A plurality of hole-shaped exhaust ports 1202 are provided on the side of the gas collection chamber 1201. The crystallizer body is provided with an absorbent cotton installation chamber 1013. In the absorbent cotton installation chamber 1013, an absorbent cotton 9 is disposed transversely. A second temperature sensor 17 and a humidity sensor 18 are disposed on the top of the gas collecting chamber 1201. Among them, the first position sensor 13, the second position sensor 14 and the rotation speed controller 24 are respectively electrically connected to the signal input end of the signal display lamp group 25, and the signal output end of the signal display lamp group 25 is connected to the signal input end of the microwave antenna controller. Electrical connection (the microwave controller includes the first microwave antenna controller 20, the second microwave antenna controller 21, the third microwave antenna controller 22 and the fourth microwave antenna controller 23), the first temperature sensor 16, the second temperature sensor 17 and the humidity sensor 18 are electrically connected to the signal input end of the microwave antenna controller respectively, and the signal output end of the microwave antenna controller is electrically connected to the microwave antenna 7 .

In particular, the mounting rack 1 has a special shape, and an isolation vertical plate 104 is provided in the middle of the outside of the mounting rack 1. Two asymmetrical first drying chambers 103 and two second drying chambers 105 are separated by the isolation vertical plates 104; the mounting rack 1 The angles of the lower special-shaped bracket 102 are: ∠a=101.35°, ∠b=168.65°, ∠c=172.42°, ∠d=82.42°, ∠e=172.41°, ∠f=168.69°, ∠g=16.70 °, ∠h=16.70°. The maximum unfolded width H of the mounting bracket 1 is the limit width of the isolation vertical plate 104 opened within the crystallizer body.

The drying method using the above-mentioned thin slab continuous casting mold includes the following steps:

Step 1: Start the main power start switch 28, detect when the signals of the first position sensor 13 and the second position sensor 14 reach the signal display light group 25, the corresponding display light lights up, and when the signal of the speed controller 24 reaches the signal display light group 25 The corresponding display light lights up and when the above conditions are met at the same time, the microwave antenna 7 is started;

Step 2: Set the drying time to 3 minutes on the time relay 26, and control the microwave antenna 7 through the microwave antenna controller to emit microwave signals for drying. When the set time is reached, it will automatically stop and send out a completion signal through the sound and light alarm 30. Drying has been completed; during the drying process, the second temperature sensor 17 detects the temperature in the gas collecting chamber 1201 in real time, the humidity sensor 18 detects the humidity in the gas collecting chamber 1201 in real time, and detects that the moisture in the crystallizer body has been completely dried. In order to further ensure safe production and prevent molten steel splashing accidents during molten steel casting caused by moisture on the surface of the mold and insufficient drying of the graphite coating, moisture detection paper can be used to check whether the gas ejected from the exhaust port 1202 meets the required process conditions. The degree of dryness was checked and the result was normal, indicating that the copper plate of the crystallizer has been completely dried and can be used for subsequent production.

Claims (10)

1. A thin slab continuous casting crystallizer drying method, characterized in that: the thin slab continuous casting crystallizer includes a crystallizer body, and the crystallizer body is provided with a time relay (26) and a main power start switch (28) , main power stop switch (27), emergency stop switch (29) and sound and light alarm (30); the crystallizer body is divided into several independent cavities by the mounting frame (1), the length direction of the mounting frame (1) There are first crystallizer copper plates (2) and second crystallizer copper plates (3) on both sides, first baffles (4) and second baffles (5) on both sides in the width direction, and there are Upper cover (6); a microwave antenna installation room (1014) is provided on the top of each cavity. A microwave antenna (7) is provided in the inner cavity of the microwave antenna installation room (1014). A microwave antenna is provided on the top of the microwave antenna installation room (1014). The antenna protective cover (8) and the side of the microwave antenna installation chamber (1014) are equipped with side gas collection chambers (108) connected with them; there are two microwave antenna installation chambers (1014) at the transverse center of the installation frame (1) There is an intermediate gas collection chamber (1010) connected with each cavity. The intermediate gas collection chamber (1010) and the edge gas collection chamber (108) are connected through the edge gas collection channel (109). The mounting bracket (1) There is a gas channel (1012) at the center; an exhaust device is connected to the crystallizer body, and the exhaust device is connected to the gas channel (1012) through the mounting hole (1011). The exhaust device includes a fan impeller (10) , there is an exhaust hood (12) above the fan impeller (10), the exhaust hood (12) includes a gas capture cover (1203), and a gas collection chamber (1201) is provided on the top of the gas capture cover (1203), and the gas collection chamber (1201) 1201) A number of hole-shaped exhaust outlets (1202) are provided on the side; the drying method includes the following steps: Step 1: First turn on the main power start switch (28) of the crystallizer body, check that the signals of all sensors and controllers are normal and the corresponding signal display light group (25) lights up, then start the microwave antenna (7); Step 2: Set the drying time on the time relay (26) of the crystallizer body, and control the microwave antenna (7) through the microwave antenna controller to emit microwave signals for drying. When the set time is reached, it automatically stops and passes through the crystallizer body. The sound and light alarm (30) sends out the end signal; during the drying process, the temperature and humidity in the gas collecting chamber (1201) are detected in real time to determine whether the moisture in the crystallizer body is dried. If the drying condition is not good, then Increase the output power of the microwave antenna (7) and the speed of the fan impeller (10) until drying. 2. A thin slab continuous casting mold drying method according to claim 1, characterized in that: the mounting frame (1) is symmetrically provided with baffle mounting holes (101) in the width direction, and the first baffle (4) and the second baffle (5) are provided with a baffle bayonet (502) that matches the baffle mounting hole (101); the first baffle (4) and the second baffle (5) ) is provided with a baffle handle (501) on the outside. 3. A thin slab continuous casting mold drying method according to claim 2, characterized in that: the mounting frame (1) is in a special shape, and an isolation vertical plate (104) is provided in the middle of the outside of the mounting frame (1). , several asymmetric first drying chambers (103) and second drying chambers (105) are separated by isolation vertical boards (104). 4. A thin slab continuous casting mold drying method as claimed in claim 3, characterized in that: the top four corners of the mounting frame (1) are symmetrically provided with connecting portions extending to the outside of the mounting frame (1), The connecting portion is provided with positioning holes (106), and the first mold copper plate (2) and the second mold copper plate (3) are connected to the mounting bracket (1) through positioning pins (301) inserted into the positioning holes (106). 5. A thin slab continuous casting mold drying method according to claim 4, characterized in that a lifting hole (107) is provided on the side of the connecting part close to the microwave antenna protective cover (8). 6. A thin slab continuous casting mold drying method according to claim 1, characterized in that: an absorbent cotton installation chamber (1013) is provided on the mold body adjacent to the exhaust port (1202). ), the absorbent cotton (9) is horizontally arranged in the absorbent cotton installation room (1013). 7. A thin slab continuous casting mold drying method according to any one of claims 1 to 6, characterized in that: the angles of the special-shaped bracket (102) at the lower part of the mounting bracket (1) are: ∠ a=101.35°, ∠b=168.65°, ∠c=172.42°, ∠d=82.42°, ∠e=172.41°, ∠f=168.69°, ∠g=16.70°, ∠h=16.70°. 8. The thin slab continuous casting mold drying method according to claim 1, characterized in that: the intermediate gas collection chamber (1010) is in a mesh shape. 9. A thin slab continuous casting mold drying method according to claim 1, characterized in that: the transmitting antenna direction of the microwave antenna (7) is aligned with the inside of the microwave antenna installation room (1014). 10. A thin slab continuous casting mold drying method according to claim 1, characterized in that: the sensor includes a first position sensor (13) located at all baffle mounting holes (101), Second position sensors (14) at all positioning holes (106), first temperature sensors (16) located on all microwave antenna protective covers (8), second temperature sensors located at the top of the gas collection chamber (1201) Sensor (17) and humidity sensor (18) as well as a speed controller (24) that controls the fan impeller (10). The first position sensor (13), the second position sensor (14) and the speed controller (24) are respectively It is electrically connected to the signal input end of the signal display lamp group (25), the signal output end of the signal display lamp group (25) is electrically connected to the signal input end of the microwave antenna controller, the first temperature sensor (16), the second temperature sensor (17) and the humidity sensor (18) are electrically connected to the signal input end of the microwave antenna controller respectively, and the signal output end of the microwave antenna controller is electrically connected to the microwave antenna (7).