Constant-temperature drying device for galvanized sheet strip passivation liquid film

Abstract

The utility model relates to a galvanized sheet strip passivation liquid film constant temperature drying device which comprises a fan air inlet pipe, one end of the fan air inlet pipe is fixedly connected with a motor, the other end of the fan air inlet pipe is fixedly connected with a heating device, the end portion of the heating device is fixedly connected with a thermocouple I, and the thermocouple I is fixedly connected with an air return pipe. The end of the air return pipe is connected with a spraying box, a plate and strip channel is installed on the spraying box, and a connecting air pipe is installed on the side wall of the spraying box. The spraying box comprises a protective cover shell, and one end of the protective cover shell is fixedly connected with a heat insulation lining. The motor is connected with a centrifugal fan, one side of the centrifugal fan is fixedly connected with a spraying box support through a connecting bolt, and one side of the centrifugal fan is fixedly connected with a metal adiabatic expansion joint. The passivation liquid film drying device has the advantages of being reasonable in structural design, novel in conception, convenient and fast to operate, constant in drying temperature, even in passivation liquid film drying and not prone to falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, in particular to a constant-temperature drying device for a galvanized plate strip passivation liquid film. Background Art

[0002] Galvanized, galvanized aluminum, and galvanized aluminum-magnesium sheets and strips are widely used in the construction, automotive, home appliance, machinery, and electronics industries due to their excellent corrosion resistance and self-healing properties, significantly extending the life of the base steel sheet. Since 2017, national galvanized sheet production has shown a fluctuating upward trend, becoming a new type of corrosion-resistant sheet material.

[0003] Passivation treatment is an important process for galvanized products and belongs to the film-forming process of plate and strip. That is, the passivation liquid is evenly coated on the surface of the strip using roller coating equipment. After drying and solidification, a protective layer of passivation liquid is formed on the surface of the strip. Firstly, it can improve the glossiness and wear resistance of the surface of the strip. Secondly, the protective film formed on the surface of the strip can prevent the strip from getting damp and causing white rust defects during transportation and storage. Utility Model Content

[0004] The purpose of the utility model is to provide a galvanized sheet strip passivation liquid film constant temperature drying device with reasonable structural design, novel conception, convenient operation, constant drying temperature, uniform drying of the passivation liquid film, and the film layer not easy to fall off.

[0005] The utility model discloses a constant temperature drying device for a passivation liquid film of a galvanized sheet strip, comprising an air inlet duct of a fan, one end of the air inlet duct of the fan is fixedly connected to a motor, the other end of the air inlet duct of the fan is fixedly connected to a heating device, the end of the heating device is fixedly connected to a thermocouple I, the thermocouple I is fixedly connected to a return air duct, the end of the return air duct is connected to a spray box, a plate and strip channel is installed on the spray box, and a connecting air duct is installed on the side wall of the spray box.

[0006] The spray box comprises a protective cover shell, one end of which is fixedly connected with a heat insulating lining.

[0007] The fan air inlet duct and spray box are supported and welded by steel sections and plates to form a protective shell with certain strength and thermal stability; the thermal insulation lining uses ceramic fiber blanket to fill the space between the furnace shell and the inner lining plate, which can reduce the heat transfer with the open environment outside the spray box and play a role in thermal insulation; the spray box is set on both sides of the strip, and nozzles are installed inside, which can evenly spray hot air onto the upper and lower surfaces of the plate and strip to ensure that both sides of the strip are heated evenly, thereby making the film layer thickness evenly distributed and making the film layer not easy to fall off; the heating device can provide a thermal power source for the spray box, and the hot air can enter the spray box through the return air duct to provide a thermal power source for the spray box. According to different working conditions, all or part of the heating devices can be selected to start working, adjust the real-time temperature, and operate conveniently.

[0008] The motor is connected to a centrifugal fan, one side of the centrifugal fan is fixedly connected to a spray box bracket through a connecting bolt, and one side of the centrifugal fan is fixedly connected to a metal insulation expansion joint.

[0009] The fan inlet duct and centrifugal fan are set to circulate through the fan inlet duct, sending the hot air evenly to the spray box, and then inhaling the hot air from the spray box outlet to form a constant temperature circulation closed loop to ensure the uniformity of the furnace temperature.

[0010] The spray box bracket is provided with an inspection door.

[0011] The inspection door is provided for inspection of the spray box bracket and the spray box, which is convenient for inspection and can extend the service life of the entire drying device.

[0012] Thermocouples II are fixedly connected on both sides of the heating device.

[0013] A bracket is fixedly installed on the bottom surface of the protective cover shell.

[0014] The beneficial effects of the utility model are:

[0015] 1) The fan air inlet duct and spray box are supported and welded by steel sections and plates to form a protective shell with certain strength and thermal stability; the thermal insulation lining uses ceramic fiber blanket to fill the space between the furnace shell and the inner lining plate, which can reduce the heat transfer with the open environment outside the spray box and play a role in thermal insulation; the spray box is set on both sides of the strip, and nozzles are installed inside to evenly spray hot air onto the upper and lower surfaces of the strip to ensure that both sides of the strip are heated evenly, thereby making the film layer thickness evenly distributed and making the film layer not easy to fall off; the heating device is set to provide a thermal power source for the spray box, and the hot air can enter the spray box through the return air duct to provide a thermal power source for the spray box. According to different working conditions, all or part of the heating devices can be selected to start working, adjust the real-time temperature, and operate conveniently.

[0016] 2) The fan inlet duct and centrifugal fan are set to circulate through the fan inlet duct, sending the hot air evenly to the spray box, and then inhaling the hot air from the spray box outlet to form a constant temperature circulation closed loop to ensure the uniformity of the furnace temperature.

[0017] 3) The inspection door is provided for inspection of the spray box bracket and the spray box, which is convenient for inspection and can extend the service life of the entire drying device.

[0018] 4) The device has a reasonable structural design, novel concept, convenient operation, constant drying temperature, uniform drying of the passivation liquid film, and the film layer is not easy to fall off. The drying effect is good and it is worthy of large-scale promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a top view of the utility model;

[0020] Figure 2 This is the main view of the utility model;

[0021] Figure 3 It is a left view of the utility model;

[0022] Figure 4 This is a working principle diagram of the utility model.

[0023] In the figure: fan air inlet duct 001, industrial frequency motor 2, connecting air duct 003, spray box 004, plate channel 005, return air duct 006, thermocouple I 007, heating device 008, protective cover shell 009, insulation lining 010, bracket 011, centrifugal fan 012, connecting bolts 013, spray box bracket 014, inspection door 015, metal insulation expansion joint 016, thermocouple II 017. DETAILED DESCRIPTION

[0024] Example 1.

[0025] The following will be combined with the attached Figure 1-4 The utility model is further described.

[0026] The utility model includes a fan air inlet pipe 001, a power frequency motor 002, a connecting air duct 003, a spray box 004, a plate channel 005, a return air duct 006, a thermocouple I 007, a heating device 008, a protective cover 009, an insulating lining 010, a bracket 011, a centrifugal fan 012, a connecting bolt 013, a spray box bracket 014, an inspection door 015, a metal insulating expansion joint 016, and a thermocouple II 017. The specific structure includes a fan The fan air inlet duct 001, one end of the fan air inlet duct 001 is fixedly connected to the motor 002, the other end of the fan air inlet duct 001 is fixedly connected to the heating device 008, the end of the heating device 008 is fixedly connected to the thermocouple I 007, the thermocouple I 007 is fixedly connected to the return air duct 006, the end of the return air duct 006 is connected to the spray box 004, the spray box 004 is installed with a plate channel 005, and the side wall of the spray box 004 is installed with a connecting air duct 003.

[0027] The spray box 004 includes a protective cover shell 009 , one end of which is fixedly connected to a heat insulating lining 010 , and a bracket 011 is fixedly installed on the bottom surface of the protective cover shell 009 .

[0028] The motor 002 is connected to a centrifugal fan 012 , one side of the centrifugal fan 012 is fixedly connected to a spray box bracket 014 via a connecting bolt 013 , and one side of the centrifugal fan 012 is fixedly connected to a metal insulation expansion joint 016 .

[0029] The spray box bracket 014 is provided with an inspection door 015 .

[0030] Thermocouples II 017 are fixedly connected to both sides of the heating device 008.

[0031] Instructions for use: When the plate and strip after passivation and preliminary drying passes through the spray box 004, the industrial frequency motor 002 starts quickly, driving the centrifugal fan 012 to rotate and work, and at the same time the heating device 008 starts to heat quickly, and the centrifugal fan 012 inhales the air heated to about 120°C by the heating device 008 through the fan air inlet pipe 001, and transports the high-temperature air to the connecting air duct 003. After passing through the connecting air duct 003, the high-temperature air is respectively transported to the left and right spray boxes 004, and is evenly sprayed on the upper and lower surfaces of the plate and strip through the nozzles in the spray box 004 to achieve temperature balance inside and outside the strip; at the same time, the spray box 004 is connected to the return air duct 006, and the high-temperature air sprayed on the surface of the plate and strip enters the heating device 008 again through the return air duct 006. After passing through the heating device 008, the temperature rises to about 120°C, and after passing through the centrifugal fan 012, it enters the spray box 004 again and is sprayed on the upper and lower surfaces of the plate and strip, forming a constant temperature hot air circulation.

[0032] The centrifugal fan 012 is electrically interlocked with the heating device 008. Before the heating device 008 is started, the start and stop status of the centrifugal fan 012 is first detected. If the centrifugal fan 012 has been started, the heating device 008 starts heating. Otherwise, the heating device 008 will not start and the fault light will be turned on. A total of 004 ​​sets of temperature sensing devices are set up in the device, including a set of thermocouple II 017 at the inlet and outlet of the heating device 008, and a set of thermocouple I 007 at the air inlet of the spray box 004 on both sides. Thermocouple I 007 is used for system temperature control. The measured value is compared with the set value to dynamically control the spray gas temperature in the spray box 004. Thermocouple II 017 is used for safety detection. The measured value is compared with the safety upper limit temperature to protect the stable operation of the system.

[0033] Example 2.

[0034] The utility model includes a fan air inlet pipe 001, a power frequency motor 002, a connecting air duct 003, a spray box 004, a plate channel 005, a return air duct 006, a thermocouple I 007, a heating device 008, a protective cover 009, an insulating lining 010, a bracket 011, a centrifugal fan 012, a connecting bolt 013, a spray box bracket 014, an inspection door 015, a metal insulating expansion joint 016, and a thermocouple II 017. The specific structure includes a fan The fan air inlet duct 001, one end of the fan air inlet duct 001 is fixedly connected to the motor 002, the other end of the fan air inlet duct 001 is fixedly connected to the heating device 008, the end of the heating device 008 is fixedly connected to the thermocouple I 007, the thermocouple I 007 is fixedly connected to the return air duct 006, the end of the return air duct 006 is connected to the spray box 004, the spray box 004 is installed with a plate channel 005, and the side wall of the spray box 004 is installed with a connecting air duct 003.

[0035] The spray box 004 includes a protective cover shell 009 , one end of which is fixedly connected to a heat insulating lining 010 , and a bracket 011 is fixedly installed on the bottom surface of the protective cover shell 009 .

[0036] The motor 002 is connected to a centrifugal fan 012 , one side of the centrifugal fan 012 is fixedly connected to a spray box bracket 014 via a connecting bolt 013 , and one side of the centrifugal fan 012 is fixedly connected to a metal insulation expansion joint 16 .

[0037] The spray box bracket 014 is provided with an inspection door 015 .

[0038] Thermocouples II 017 are fixedly connected to both sides of the heating device 008.

[0039] A bracket 011 is fixedly mounted on the bottom surface of the protective cover shell 009.

[0040] Instructions for use: When the plate and strip after passivation and preliminary drying passes through the spray box 004, the industrial frequency motor 002 starts quickly, driving the centrifugal fan 012 to rotate and work, and at the same time the heating device 008 starts to heat quickly, and the centrifugal fan 012 inhales the air heated to about 120°C by the heating device 008 through the fan air inlet pipe 001, and transports the high-temperature air to the connecting air duct 003. After passing through the connecting air duct 003, the high-temperature air is respectively transported to the left and right spray boxes 004, and is evenly sprayed on the upper and lower surfaces of the plate and strip through the nozzles in the spray box 004 to achieve temperature balance inside and outside the strip; at the same time, the spray box 004 is connected to the return air duct 006, and the high-temperature air sprayed on the surface of the plate and strip enters the heating device 008 again through the return air duct 006. After passing through the heating device 008, the temperature rises to about 120°C, and after passing through the centrifugal fan 012, it enters the spray box 004 again and is sprayed on the upper and lower surfaces of the plate and strip, forming a constant temperature hot air circulation.

[0041] The centrifugal fan 012 is electrically interlocked with the heating device 008. Before the heating device 008 is started, the start and stop status of the centrifugal fan 012 is first detected. If the centrifugal fan 012 has been started, the heating device 008 starts heating. Otherwise, the heating device 008 will not start and the fault light will be turned on. The device is equipped with a total of 4 sets of temperature sensing devices, including a set of thermocouple II 017 at the inlet and outlet of the heating device 008, and a set of thermocouple I 007 at the air inlet of the spray box 04 on both sides. Thermocouple I 007 is used for system temperature control. The measured value is compared with the set value to dynamically control the injection gas temperature in the spray box 004. Thermocouple II 017 is used for safety detection. The measured value is compared with the safety upper limit temperature to protect the stable operation of the system.

[0042] The provided bracket 011 can support the protective cover shell 009.

Claims

1. A constant temperature drying device for a galvanized sheet with a passivation liquid film, characterized in that: The invention comprises a fan air inlet pipe (001), one end of which is fixedly connected to a motor (002), the other end of which is fixedly connected to a heating device (008), the end of the heating device (008) is fixedly connected to a thermocouple I (007), the thermocouple I (007) is fixedly connected to a return air pipe (006), the end of the return air pipe (006) is connected to a spray box (004), a plate channel (005) is installed on the spray box (004), and a connecting air pipe (003) is installed on the side wall of the spray box (004).

2. A galvanized sheet strip passivation liquid film constant temperature drying device according to claim 1, characterized in that: The spray box (004) comprises a protective cover shell (009), and one end of the protective cover shell (009) is fixedly connected to a heat insulating lining (010).

3. A galvanized sheet strip passivation liquid film constant temperature drying device according to claim 2, characterized in that: The motor (002) is connected to a centrifugal fan (012), one side of the centrifugal fan (012) is fixedly connected to a spray box bracket (014) via a connecting bolt (013), and one side of the centrifugal fan (012) is fixedly connected to a metal insulation expansion joint (016).

4. A galvanized sheet strip passivation liquid film constant temperature drying device as claimed in claim 3, characterized in that: An inspection door (015) is provided on the spray box bracket (014).

5. A galvanized sheet strip passivation liquid film constant temperature drying device as claimed in claim 4, characterized in that: Thermocouple II (017) is fixedly connected to both sides of the heating device (008).

6. A galvanized sheet strip passivation liquid film constant temperature drying device according to claim 5, characterized in that: A bracket (011) is fixedly mounted on the bottom surface of the protective cover shell (009).

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