An adaptive electromagnetic heating flattening apparatus and method thereof

Abstract

The application discloses a self-adaptive electromagnetic heating flattening device, which comprises an electromagnetic induction heating device, a machine vision detection flatness module and a cold water machine. The electromagnetic induction heating device comprises an electromagnetic induction heating coil and a plurality of silicon steel sheet groups arranged in a ring shape and movable along inner and outer slide rails. A variable frequency power supply is arranged above the cold water machine. The machine vision detection flatness module is installed above the electromagnetic induction heating device. Each silicon steel sheet group has a plurality of silicon steel sheets with the same thickness, and silicon steel sheets with different thicknesses are combined into silicon steel sheet groups with the same thickness. During flattening, the machine vision detection flatness module detects the flatness of the plane to be flattened, and different silicon steel sheet groups are arranged and combined according to the detection result. Non-working silicon steel sheet groups are transported to the outer track, and working silicon steel sheet groups are symmetrically transported to the inner track. The inner track rotates the silicon steel sheet groups to the working area for electromagnetic heating flattening. The application can automatically detect the complex working conditions of the flattening area and realize self-adaptive and efficient precise flattening.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic heating leveling technology, and relates to an adaptive electromagnetic heating leveling device and method. Background Technology

[0002] In the field of shipbuilding engineering, the hull structures of luxury cruise ships, warships, and other vessels are largely constructed from welded steel plates. During the welding process, factors such as arc displacement and uneven heating inevitably lead to residual stress in the welded area, causing deformation. Currently, a large number of shipbuilding steel plates are leveled using water-fire leveling. Water-fire leveling is a method of shape correction by heating and cooling metal materials. Its basic principle is to utilize the characteristics of thermal expansion and contraction, and to correct deformation by controlling the temperature of the metal plate. However, traditional water-fire leveling methods are energy-intensive, inefficient, and often struggle to precisely control the shape correction of the plates due to the unevenness of flame heating and cooling, as well as manual operation. Electromagnetic induction heating, on the other hand, converts electrical energy into heat energy through an electromagnetic field. It features high efficiency, rapid heating, and precise control. Electromagnetic induction heating generates eddy currents inside the heated object, resulting in uniform internal heating. Compared to traditional methods, this helps avoid localized overheating or uneven heating, improving product quality.

[0003] Chinese patent application (2021100315887) discloses an intelligent mobile electromagnetic induction leveling device and method, including a device body and a wireless remote controller. While the device is designed to measure the temperature of the leveling area, mounting an infrared temperature sensor on the induction coil affects the flatness of the coil surface, thus impacting the leveling effect. Furthermore, the heating method does not adaptively adjust to the complex flatness of the steel plate, further affecting the leveling performance. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an adaptive electromagnetic heating leveling device and method, which is highly intelligent and can automatically detect complex working conditions in the leveling work area through a vision detection module, realize real-time adaptive and precise leveling, improve work efficiency, and achieve good leveling effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution.

[0006] An adaptive electromagnetic heating leveling device includes an electromagnetic induction heating device, a machine vision flatness inspection module, and a chiller. The electromagnetic induction heating device includes a handheld coaxial transformer, an electromagnetic induction heating coil, and multiple ring-shaped silicon steel sheet assemblies movable along inner and outer slide rails. A frequency converter is positioned above the chiller. The chiller is connected to the electromagnetic induction heating device via a first and second water pipe assembly. The electromagnetic induction heating device returns water to the chiller via a third water pipe assembly, forming a circulating water flow to reduce the temperature of the electromagnetic induction heating device and the frequency converter. The frequency converter provides power to the chiller and the electromagnetic induction heating device via a first and second wiring assembly. The visual inspection flatness module is installed above the electromagnetic induction heating device to scan the curved surface of the steel plate. Each silicon steel sheet group has several silicon steel sheets of the same thickness, and silicon steel sheets of different thicknesses form silicon steel sheet groups of the same thickness. Since the number of silicon steel sheets contained in each silicon steel sheet group is different, different numbers of magnetic field lines can be generated. During straightening, the machine vision inspection flatness module detects the flatness of the marine thin plate to be straightened, and arranges different silicon steel sheet groups according to the flatness of the detected local area of ​​the thin plate. The non-working silicon steel sheet groups are transported to the outer track, and the working silicon steel sheet groups are transported in an orderly and symmetrical manner to the inner track. The inner track then rotates the silicon steel sheet groups to the working area of ​​the silicon steel sheet for electromagnetic heating straightening.

[0007] Furthermore, the electromagnetic induction heating device also includes a hollow elongated column, a track connecting device connecting the outer track and the inner track, and a first and a second latch for fixing the silicon steel sheet assembly transported to the working area via the inner track. The first and second latches are in a closed state during leveling operation and in an open state during non-leveling operation.

[0008] Furthermore, during the working and transportation of the silicon steel sheet assembly, it is hoisted by a hoisting device and placed inside the slide rail so that it is directly below the slide rail; the silicon steel sheet assembly is provided with inner and outer slots for fixing the silicon steel sheet assembly in a specified position in the slide rail; the straight section of the outer slide rail is provided with several outer track slots for coupling the outer slots of the silicon steel sheet assembly; the straight section of the inner slide rail is provided with several inner track slots for coupling the inner slots of the silicon steel sheet, which facilitates the fixing and position marking of the silicon steel sheet assembly.

[0009] Furthermore, the machine vision flatness detection module includes a straightness detection module, a coplanarity detection module, a gap detection module, and a position detection module, which can detect the horizontal straightness, coplanarity, and gap indicators of the working area; the flatness detection module is connected to the correction module, which corrects erroneous data.

[0010] Specifically, the circuit of the machine vision flatness detection module includes a reference power supply circuit and a first power amplifier circuit that are connected to each other. The first power amplifier circuit can amplify the power of the reference power supply provided by the reference power supply circuit so that the power generated by the power supply circuit can meet the high power requirements of the system terminal.

[0011] An adaptive electromagnetic heating leveling method, employing the aforementioned adaptive electromagnetic heating leveling equipment, includes the following steps:

[0012] Step 1. Connect the power supply and turn on the inverter power supply of the leveling system;

[0013] Step 2. Move the electromagnetic induction heating device to the area to be leveled, and the visual inspection module detects the flatness of the area to be leveled;

[0014] Step 3. Based on the flatness information, allocate and arrange the working silicon steel sheet groups and non-working silicon steel sheet groups. The inner and outer slide rails start to rotate in a cycle. The non-working silicon steel sheet groups are allocated to the outer track, and then the silicon steel sheet groups required for leveling are moved to the inner track in an orderly and symmetrical manner. Each silicon steel sheet group has a different number of magnetic field lines so as to adaptively level working areas with different flatness.

[0015] Step 4. The inner slide rail starts to rotate, adjusting the already arranged working silicon steel sheet group to the working area, and the buckle is tightened to fix the working silicon steel sheet group, which facilitates the heating of the induction coil;

[0016] Step 5. Start the heating function. The frequency converter power output is transmitted to the electromagnetic induction heating device through the water and electricity transport pipeline.

[0017] Step 6. Start the chiller. The chiller outputs cooling water to cool the frequency converter and electromagnetic induction heating device.

[0018] Step 7. After the leveling is completed, the machine vision flatness detection module is turned on again to detect whether a second leveling is needed;

[0019] Step 8. After the entire thin plate is heated, turn off the power and drain the water from the chiller.

[0020] Compared with the prior art, the advantages and beneficial effects of the present invention include:

[0021] 1. The adaptive electromagnetic heating leveling equipment of the present invention is more user-friendly and intelligent, with advantages such as simple structure, high degree of automation and intelligence, and is suitable for large-area steel plate deformation correction work.

[0022] 2. This invention includes a machine vision flatness inspection module installed above the electromagnetic induction heating device. This module can scan the curved surface of the steel plate over a wide area and effectively reduce blind spots in the leveling process. This makes the mobile heating operation more automated, significantly saves labor, and makes the leveling work more precise.

[0023] 3. This invention combines silicon steel sheets of different thicknesses into silicon steel sheet groups of the same thickness. Different numbers of silicon steel sheet groups can be moved to the working area according to the leveling requirements, thereby generating magnetic field lines that meet the leveling requirements. This effectively overcomes the limitations of the existing technology where uniform distribution of silicon steel sheets is only suitable for planar leveling and is limited by curved surfaces. It can achieve efficient processing and has a simple structure.

[0024] 4. This invention integrates a chiller, a variable frequency power supply, and an induction heating device into one unit, which can reduce the temperature in real time and effectively reduce heat generation. Attached Figure Description

[0025] Figure 1 This is a front view of an adaptive electromagnetic heating leveling device according to the present invention.

[0026] Figure 2 This is a rear view of an adaptive electromagnetic heating leveling device according to the present invention.

[0027] Figure 3 This is a front view of an electromagnetic induction heating device according to an embodiment of the present invention.

[0028] Figure 4 This is a rear view of an electromagnetic induction heating device according to an embodiment of the present invention.

[0029] Figure 5 This is a partial cross-sectional view of an electromagnetic induction heating device according to an embodiment of the present invention.

[0030] Figure 6a This is a front view of a silicon steel sheet assembly according to an embodiment of the present invention.

[0031] Figure 6b This is a cross-sectional view of a silicon steel sheet assembly according to an embodiment of the present invention.

[0032] Figure 7 This is a cross-sectional view of a double-track leveling device according to an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of a machine vision flatness detection module according to an embodiment of the present invention.

[0034] Figure 9 This is a circuit diagram of a machine vision flatness detection module according to an embodiment of the present invention.

[0035] Among them: Leveling machine 100: chiller 110, frequency converter 120, first water pipe assembly interface 111, first wire assembly interface 112, water and electricity transport pipeline 113; Electromagnetic induction heating device 200: handheld coaxial transformer 210, hollow long column 220; induction coil 230, first latching device 231, second latching device 232, track hoisting device 233; outer track 240, outer track slots 241, 242, 2 43; Inner track 250, inner track slots 251, 252, 253; Track connecting device 260; Silicon steel sheet assembly 300: Silicon steel sheet hoisting device 310, inner silicon steel sheet slot 330, outer silicon steel sheet slot 320, silicon steel sheet 341; Machine vision inspection flatness module 400: Straightness inspection module 401, coplanarity inspection module 402, gap inspection module 403, position inspection module 404, visual correction module 410. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings.

[0037] like Figure 1 As shown, an adaptive electromagnetic heating leveling device of the present invention includes an electromagnetic induction heating device 200, a machine vision inspection flatness module 400, and a chiller 110. The electromagnetic induction heating device 200 includes a handheld coaxial transformer 210, an electromagnetic induction heating coil 230, and multiple silicon steel sheet groups arranged in a ring and movable along an inner and outer track. A frequency converter 120 is disposed above the chiller 110. The chiller 110 is connected to the electromagnetic induction heating device 200 through a first water pipe assembly and a second water pipe assembly. The electromagnetic induction heating device 200 returns water to the chiller 110 through a third water pipe assembly, forming a circulating water flow to reduce the temperature of the electromagnetic induction heating device 200 and the frequency converter 120. The frequency converter 120 provides power to the chiller 110 and the electromagnetic induction heating device 200 through a first wire assembly and a second wire assembly. The machine vision flatness inspection module 400 is installed above the electromagnetic induction heating device 200 to scan the curved surface of the steel plate. Each silicon steel sheet group 300 has several silicon steel sheets 341 of the same thickness. Silicon steel sheets of different thicknesses form silicon steel sheet groups 300 of the same thickness. Since the number of silicon steel sheets contained in each silicon steel sheet group is different, different numbers of magnetic field lines can be generated. During straightening, the silicon steel sheet group 300 is transported directly below the inner and outer tracks. The machine vision flatness inspection module 400 detects the flatness of the marine steel plate to be straightened and arranges different silicon steel sheet groups according to the flatness of the detected local area of ​​the steel plate. The non-working silicon steel sheet group 300 is transported to the outer track 240, and the working silicon steel sheet group 300 is transported in an orderly and symmetrical manner to the inner track 250. The inner track then rotates the silicon steel sheet group 300 to the working area of ​​the silicon steel sheet for electromagnetic heating straightening.

[0038] Figure 2 This is a rear view of an adaptive electromagnetic heating leveling device according to the present invention, as shown below. Figure 2 As shown, it also includes a chiller 110, a frequency converter 120, a first water pipe assembly interface 111, a first electrical wire assembly interface 112, and a water and electricity transport pipe 113. The electromagnetic induction heating device includes a handheld coaxial transformer 210, a hollow long column 220, an induction coil 230, an outer track 240, an inner track 250, a track connecting device 260, and a machine vision inspection flatness module 400. The chiller 110 is located at the top, and the frequency converter 120 is installed above it. The electromagnetic induction coil 230 is installed at the front end of the coaxial transformer 210. The first water pipe assembly 111 and the water and electricity transport pipe 113 of the chiller 110 are connected to the electromagnetic induction heating device 200. The electromagnetic induction heating device 200 then returns water to the chiller 110 through the output pipe in the water and electricity transport pipe 113 to reduce the temperature of the electromagnetic induction heating device 200 and the frequency converter 120. In addition, the variable frequency power supply 120 provides power to the chiller 110 and the electromagnetic induction heating device 200 by connecting the first wire assembly interface 111 and the power transmission line in the water and electricity transmission pipe 113.

[0039] like Figure 3 The image shown is a front view of the electromagnetic induction heating device of the present invention. The electromagnetic induction heating device 200 includes a handheld coaxial transformer 210, an electromagnetic induction coil 230, an outer rail 240, an inner rail 250, a first latch 231, a second latch 232, and a rail connection 260. Its overall working principle is as follows: the frequency converter 120 provides high-frequency, high-voltage power to the electromagnetic induction heating device 200; the coaxial transformer 210 in the electromagnetic induction heating device 200 converts the high-frequency, high-voltage current into a high-frequency, low-voltage current, which is then supplied to the electromagnetic induction heating coil 230; the inner rail 250 is positioned close to the coil 230. Simultaneously, the machine vision flatness inspection module 400 is activated to detect the flatness of the marine steel plate to be leveled. The silicon steel sheet group 300 is suspended directly below the inner and outer tracks. Based on the detected flatness of the steel plate, the number of magnetic field lines requiring leveling heating is determined. Working steel sheet groups and non-working silicon steel sheet groups are arranged according to the number of magnetic field lines. The non-working silicon steel sheet group 300 is hoisted and transported to the outer track 240 via the outer track 240, inner track 250, and track connecting device 260. Then, the working silicon steel sheet group 300 is transported symmetrically and orderly to the inner track 250 via the outer track 240, inner track 250, and track connecting device 260. The inner track then rotates the silicon steel sheet group between clips 231 and 232. The working silicon steel sheet groups 300 located on both sides of the inner track 250 of the heating coil 230 generate the required number of magnetic field lines for leveling heating, achieving electromagnetic heating leveling. The electromagnetic induction coil 220 is installed at the front end of the handheld coaxial transformer 210 and fixed with copper screws.

[0040] like Figure 4 As shown, this is a rear view of the electromagnetic induction heating leveling device of the present invention. Buckles 231 and 232 are used to fix the silicon steel sheet group transported to the working area by the inner track. When the leveling work is in progress, buckles 231 and 232 are in the closed state. When not working, the buckles are in the open state, which does not affect the transportation of silicon steel sheet group on the inner and outer tracks.

[0041] like Figure 5 The diagram shows a partial cross-sectional view of the electromagnetic induction heating leveling device of the present invention, revealing two sets of silicon steel sheet assemblies 300. The silicon steel sheet assemblies 300 in the working area are suspended directly below the inner track 250, and are fixed to prevent slippage by the outer slots 320 of the silicon steel sheets, while the buckles 231 fix the position of the silicon steel sheets.

[0042] Figure 6 shows the silicon steel sheet assembly of the electromagnetic induction heating leveling device of the present invention. During operation and transportation, the silicon steel sheet assembly 300 is hoisted inside the track by the hoisting device 310, with the assembly positioned directly below the track 250. The inner and outer slots 330 and 320 of the silicon steel sheet assembly are used to fix it in a designated position within the track, facilitating marking and arrangement. The silicon steel sheet assembly 300 is composed of individual silicon steel sheets 341 of the same thickness. Different thicknesses of silicon steel sheets form assemblies of the same thickness, thus each assembly contains a different number of silicon steel sheets, generating varying numbers of magnetic field lines to achieve adaptive electromagnetic heating leveling.

[0043] like Figure 7 The diagram shows a cross-sectional view of the straight rail section of the dual-track leveling device of the electromagnetic induction heating leveling equipment of the present invention. Several outer track slots, preferably three (241, 242, 243), are spaced apart on the straight rail section of the outer track and are used for coupling the silicon steel sheet assembly via outer slot 320. Several inner track slots, preferably three (251, 252, 253), are spaced apart on the straight rail section of the inner track and are used for coupling the silicon steel sheets via inner slot 330, facilitating the fixing and marking of the silicon steel sheet assembly.

[0044] like Figure 8 The diagram shown is a schematic diagram of the machine vision inspection flatness module of the electromagnetic induction heating leveling equipment of the present invention. The machine vision inspection flatness module 400 includes a straightness inspection module 401, a coplanarity inspection module 402, a gap inspection module 403, and a position inspection module 404, which can inspect the horizontal straightness, coplanarity, gap, and other indicators of the working area. The flatness inspection module 400 is connected to the correction module 410, which can correct erroneous data.

[0045] like Figure 9The diagram shown is a circuit diagram of the machine vision inspection flatness module of the electromagnetic induction heating leveling device of the present invention. The circuit module includes a reference power supply circuit and a first power amplifier circuit that are connected to each other. The first power amplifier circuit can amplify the power of the reference power supply provided by the reference power supply circuit so that the power generated by the power supply circuit can meet the high power requirements of the system terminal.

[0046] An adaptive electromagnetic heating leveling method of the present invention includes the following steps:

[0047] Step 1: Connect the power supply and turn on the inverter power supply 120 of the leveling system;

[0048] Step 2: Move the electromagnetic induction heating device 200 to the area to be leveled, and the visual inspection module 400 inspects the flatness of the area to be leveled.

[0049] Step 3: Based on the flatness information, allocate and arrange the working silicon steel sheet groups and non-working silicon steel sheet groups. The inner track 240 and the outer track 250 start to rotate in a cycle. The non-working silicon steel sheet groups are allocated to the outer track 240, and then the silicon steel sheet groups required for leveling are moved to the inner track 250 in an orderly and symmetrical manner. Each silicon steel sheet group can generate a different number of magnetic field lines in order to adaptively level working areas with different flatness.

[0050] Step 4: The inner rail 250 starts to rotate, and the already arranged working silicon steel sheet group is adjusted to the inner rail 250, between the buckles 231 and 232. The buckles 231 and 232 are tightened to fix the working silicon steel sheet group, so as to facilitate the heating of the induction coil 230.

[0051] Step 5: Start the heating function. The output of the frequency converter 120 is transmitted to the electromagnetic induction heating device 200 through the water and electricity transport pipe 113.

[0052] Step 6: Start the chiller 110. The chiller 110 outputs cooling water to cool the frequency converter 120 and the electromagnetic induction heating device 200.

[0053] Step 7: After the leveling is completed, the machine vision flatness inspection module 400 is turned on again to check whether a second leveling is required;

[0054] Step 8: After the steel plate has been heated as a whole, turn off the power and drain the water from the chiller 110.

Claims

1. An adaptive electromagnetic heating leveling device, characterized in that, The system includes an electromagnetic induction heating device (200), a machine vision flatness inspection module (400), and a chiller (110). The electromagnetic induction heating device (200) includes a handheld coaxial transformer (210), an electromagnetic induction heating coil (230), and multiple silicon steel sheet groups arranged in a ring and movable along inner and outer slide rails. A frequency converter (120) is located above the chiller (110). The chiller (110) is connected to the electromagnetic induction heating device (200) through a first water pipe assembly and a second water pipe assembly. The electromagnetic induction heating device (200) returns water to the chiller (110) through a third water pipe assembly, forming a circulating water flow to reduce the temperature of the electromagnetic induction heating device (200) and the frequency converter (120). The frequency converter (120) provides power to the chiller (110) and the electromagnetic induction heating device (200) through a first wire assembly and a second wire assembly. The machine vision flatness inspection module (400) is installed directly above the leveling device to scan the curved surface of the steel plate; each silicon steel sheet group (300) has several silicon steel sheets (341) of the same thickness, and silicon steel sheets of different thicknesses form silicon steel sheet groups (300) of the same thickness; since the number of silicon steel sheets contained in each silicon steel sheet group is different, different numbers of magnetic field lines can be generated; during leveling, the silicon steel sheet group (300) is transported directly below the inner and outer slide rails, the machine vision flatness inspection module (400) detects the flatness of the marine thin plate to be leveled, and according to the flatness of the detected local thin plate, arranges and combines different silicon steel sheet groups, transports the non-working silicon steel sheet group (300) to the outer track (240), and transports the working silicon steel sheet group (300) to the inner track (250) in an orderly and symmetrical manner, and the inner track then rotates the silicon steel sheet group (300) to the working area of ​​the silicon steel sheet for electromagnetic heating leveling.

2. The adaptive electromagnetic heating leveling device according to claim 1, characterized in that, The electromagnetic induction heating device further includes a hollow long column (220), a track connecting device (260) connecting the outer track (240) and the inner track (250), and a first buckle (231) and a second buckle (232) for fixing the silicon steel sheet assembly transported to the working area by the inner track.

3. The adaptive electromagnetic heating leveling device according to claim 2, characterized in that, The first latch (231) and the second latch (232) are in a closed state during leveling operation and in an open state during non-leveling operation, so as not to affect the transportation of silicon steel sheet groups on the inner and outer tracks.

4. The adaptive electromagnetic heating leveling device according to claim 1, characterized in that, When the silicon steel sheet assembly (300) is transported for work, it is hoisted by the hoisting device (310) and placed inside the slide rail so that it is directly below the inner track (250). The silicon steel sheet assembly is provided with an inner slot (330) and an outer slot (320) for fixing the silicon steel sheet assembly in a specified position in the slide rail. Several outer track slots are provided on the straight section of the outer track (240) for coupling the outer slot (320) of the silicon steel sheet assembly. Several inner track slots are provided on the straight section of the inner track (250) for coupling the inner slot (330) of the silicon steel sheet, which facilitates the fixing and position marking of the silicon steel sheet assembly.

5. The adaptive electromagnetic heating leveling device according to claim 1, characterized in that, The machine vision flatness detection module (400) includes a straightness detection module (401), a coplanarity detection module (402), a gap detection module (403), and a position detection module (404), which can detect the horizontal straightness, coplanarity, and gap indicators of the working area; the flatness detection module (400) is connected to the correction module (410), and the correction module (410) corrects the erroneous data.

6. An adaptive electromagnetic heating leveling device according to claim 1 or 5, characterized in that, The circuit of the machine vision flatness detection module includes a reference power supply circuit and a first power amplifier circuit connected to each other. The first power amplifier circuit can amplify the power of the reference power supply provided by the reference power supply circuit, so that the power generated by the power supply circuit can meet the high power requirements of the system terminal.

7. An adaptive electromagnetic heating leveling method, characterized in that, The method of using the adaptive electromagnetic heating leveling device as described in any one of claims 1 to 6 includes the following steps: Step 1. Connect the power supply and turn on the inverter power supply (120) of the leveling system; Step 2. Move the electromagnetic induction heating device (200) to the area to be leveled, and the visual inspection module (400) inspects the flatness of the area to be leveled; Step 3. Using the flatness information, allocate and arrange the working silicon steel sheet groups and non-working silicon steel sheet groups. The outer track (240) and inner track (250) begin to rotate in a cycle. The non-working silicon steel sheet groups are allocated to the outer track (240), and then the silicon steel sheet groups required for leveling are moved to the inner track (250) in an orderly and symmetrical manner. Each silicon steel sheet group has a different number of magnetic field lines so as to adaptively level working areas with different flatness. Step 4. The inner track (250) starts to rotate, and the already arranged working silicon steel sheet group is adjusted to the working area. The buckles (231) and (232) tighten and fix the working silicon steel sheet group to facilitate the heating of the induction coil (230). Step 5. Start the heating function. The output of the frequency converter (120) is transmitted to the electromagnetic induction heating device (200) through the water and electricity transport pipeline (113). Step 6. Start the chiller (110). The chiller (110) outputs cooling water to cool the frequency converter (120) and the electromagnetic induction heating device (200). Step 7. After the leveling is completed, the machine vision flatness detection module (400) is turned on again to detect whether a second leveling is required; Step 8. After the overall heating of the thin plate is completed, turn off the power and drain the water from the chiller (110).

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