Raw sheet glue pretreatment device and control method thereof

Abstract

The invention discloses a raw sheet glue pretreatment device and a control method thereof, and the pretreatment device comprises a machine body used for conveying raw sheet glue; the heating assembly is mounted on the machine body and is used for heating the raw sheet glue; the heat preservation assembly is installed on the machine body and used for conducting heat preservation on the upper portion of the machine body; the driving assembly is installed on the machine body, connected with the heating assembly and used for driving the heating assembly. The pretreatment device is arranged in front of the input end of the extruder, the heating assembly and the heat preservation assembly are arranged on the pretreatment device, raw sheet rubber can be preheated before entering the extruder, and the corresponding temperature is maintained, so that the situation that the raw sheet rubber is poor in thermal plastication in the thermal plastication process can be reduced, and the production efficiency is improved. And the quality problem generated by the thermoplastic rubber material can be reduced, the conveying efficiency and the stability of products are ensured, and the process operation control of subsequent procedures is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of hot plasticizing of raw sheet rubber, and in particular to a pretreatment device for raw sheet rubber and a control method thereof. Background Art

[0002] The hot plasticizing of the original rubber sheet is a process in which the feeding mechanism conveys the rubber material into the barrel of the extruder, the screw shears, heats and plasticizes the rubber material, and keeps it at a certain temperature through the heating system of the extruder barrel. As the screw rotates and advances, it gradually transforms into a molten state.

[0003] However, in production, there are cases where the extruder does not perform well in the plasticizing of the original rubber sheet, resulting in quality problems in the extruded plasticized rubber, which affects the product delivery efficiency, stability and process operation control of subsequent processes.

[0004] Patent CN119283217A discloses a process rubber pretreatment scheme and a control device thereof, which relates to the field of rubber heating pretreatment, including: mixing the rubber raw materials to be treated in a certain proportion to ensure the uniformity of the raw materials; mixing various raw materials in an open mixing mill, and making the rubber reach a certain plasticized state by heating and shearing; running the rubber along a feed conveyor belt, and then effectively adjusting the temperature of the rubber by a control device; in the preparation of the process rubber, real-time monitoring and adjustment of the rubber are carried out by quality detection instruments and methods, and after preparation, it is used for subsequent molding and vulcanization processes.

[0005] Although the above patent can improve the quality problems of the rubber compound, since the rubber compound is still exposed to the air after heating, the temperature drops quickly, and the quality of the extruded hot plasticized rubber compound cannot be guaranteed. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention designs a pretreatment device for raw sheet glue, comprising: a body, used to convey the raw sheet glue; a heating component, installed on the body, used to heat the raw sheet glue; a heat preservation component, installed on the body, used to keep the upper part of the body warm; a driving component, installed on the body and connected to the heating component, used to drive the heating component.

[0007] Preferably, the fuselage includes: a frame; a fixing plate installed on the frame and used for installing a heating component; a conveying plate installed on the top of the frame, and the insulation component is installed on the conveying plate; two conveying rollers are installed at both ends of the conveying plate respectively, and cooperate with the conveying plate to convey the original sheet glue; a mounting plate is installed on the conveying plate and used for installing a heating component and a driving component.

[0008] Preferably, the heating assembly includes: a base mounted on a fixed plate; a temperature control component mounted on the base, used to accommodate a temperature control medium and control the temperature of the temperature control medium; a delivery pipe connected to the temperature control component; a heating roller mounted on the mounting plate and connected to the drive assembly and to the delivery pipe via a connecting member.

[0009] Preferably, the temperature control component includes: a accommodating cavity, installed on the base, for accommodating the temperature control medium; a heating wire tube, installed in the accommodating cavity, for controlling the temperature of the temperature control medium; a first temperature measuring component, installed in the accommodating cavity, for detecting the temperature of the temperature control medium; a connecting port, installed on the accommodating cavity and connected to the conveying pipe.

[0010] Preferably, the heating roller includes: a roller shaft, which is mounted on a mounting plate and connected to a driving assembly; a central channel, which is arranged at the center of the roller shaft and connected to a conveying pipe through a connecting piece; and an edge channel, which is arranged at the edge of the roller shaft and communicates with the central channel.

[0011] Preferably, the driving assembly includes: a mounting seat mounted on the mounting plate; a driving member mounted on the mounting seat; a second gear connected to the output end of the driving member, and a first gear is provided on the heating roller, and the first gear is connected to the second gear.

[0012] Preferably, the insulation component includes: a shell installed on the conveying plate; a baffle installed on the front and rear sides of the shell; a cooling component installed on the top of the shell; a heating component installed on the left and right sides of the shell; and a second temperature measuring component installed on the left and right sides of the shell.

[0013] Based on the same design concept, the present invention provides a control method for a pretreatment device of an original sheet adhesive, which is characterized by comprising: controlling the temperature of heating the original sheet adhesive by a heating component; and controlling the insulation temperature above the fuselage by a heat preservation component.

[0014] Preferably, controlling the temperature of heating the original sheet adhesive by the heating component comprises the following steps: detecting the temperature of the temperature control medium in the accommodating cavity as T1 by the first temperature measuring component, and controlling the temperature of the temperature control medium by the heating wire tube according to the temperature of T1, and the control relationship thereof is as follows: 39℃≤T1≤44℃, maintain the current heating temperature.

[0015] 34℃≤T1<39℃, the heating temperature of the heating wire tube is increased by 5℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0016] 29℃≤T1<34℃, the heating temperature of the heating wire tube is increased by 10℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0017] T1<29℃, the heating temperature of the heating wire tube is increased by 15℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0018] 44℃<T1≤49℃, the heating temperature of the heating wire tube is reduced by 5℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0019] 49℃<T1≤54℃, the heating temperature of the heating wire tube is reduced by 10℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0020] T1>54℃, the heating temperature of the heating wire tube is reduced by 15℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0021] Preferably, controlling the insulation temperature above the fuselage by the insulation component includes the following steps: detecting the temperature in the shell as T2 by the second temperature measuring component, and controlling the temperature in the shell by the cooling component and the heating component according to the temperature of T2, and the control relationship is as follows: 34℃≤T2≤39℃, maintain the current heating temperature.

[0022] 29℃≤T2<34℃, the heating temperature of the heating component is increased by 5℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0023] 24℃≤T2<29℃, the heating temperature of the heating component is increased by 10℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0024] T2<24℃, the heating temperature of the heating component is increased by 15℃ on the existing basis, and the original temperature is restored after reaching the required temperature.

[0025] 39℃<T2≤44℃, the heating temperature of the heating component is reduced by 5℃ on the existing basis, and the cooling component is powered on to run. When the temperature requirement is reached, the heating component returns to the original temperature and the cooling component stops running.

[0026] 44℃<T2≤49℃, the heating temperature of the heating component is reduced by 10℃ on the existing basis, and the cooling component is powered on to run. When the temperature requirement is reached, the heating component returns to the original temperature and the cooling component stops running.

[0027] T2>49℃, the heating temperature of the heating component is reduced by 15℃ on the existing basis, and the cooling component is powered on to run. When the temperature requirement is reached, the heating component returns to the original temperature and the cooling component stops running.

[0028] Compared with the closest prior art, the beneficial effects of the present invention are: The present invention arranges a pretreatment device in front of the input end of the extruder, and the pretreatment device is provided with a heating component and a heat preservation component, which can preheat the original sheet rubber before the original sheet rubber enters the extruder and maintain the corresponding temperature, thereby reducing the situation of poor hot plasticization of the original sheet rubber during the hot plasticization process, reducing the quality problems caused by the hot plasticized rubber, ensuring the transportation efficiency and stability of the product, and ensuring the process operation control of the subsequent process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of the pretreatment device of the present invention.

[0030] Figure 2 It is a schematic diagram of the internal structure of the pretreatment device of the present invention.

[0031] Figure 3 It is a schematic structural diagram of the heating component of the present invention.

[0032] Figure 4 It is a schematic structural diagram of the temperature control component of the present invention.

[0033] Figure 5 It is a schematic diagram of the structure of the heating roller of the present invention.

[0034] Figure 6 It is a first structural schematic diagram of the thermal insulation component of the present invention.

[0035] Figure 7 It is a second structural schematic diagram of the thermal insulation component of the present invention.

[0036] Figure 8 It is a schematic diagram of the structure of the driving assembly of the present invention.

[0037] Reference numerals: 1-body, 11-frame, 12-fixed plate, 13-conveyor plate, 14-conveyor roller, 15-mounting plate, 2-heating component, 21-base, 22-temperature control component, 221-accommodating chamber, 222-heating wire tube, 223-first temperature measuring component, 224-connecting port, 23-conveyor pipe, 24-heating roller, 241-roller shaft, 242-center channel, 243-edge channel, 25-connecting component, 26-first gear, 3-insulation component, 31-shell, 32-baffle, 33-cooling component, 34-heating component, 35-second temperature measuring component, 4-driving component, 41-mounting seat, 42-driving component, 43-second gear. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] like Figure 1-Figure 8As shown, the present invention provides a pretreatment device for raw sheet glue, including: a body 1, a heating component 2, a heat-insulating component 3 and a driving component 4. The body 1 is used to convey the raw sheet glue. The heating component 2 is installed on the body 1, and is used to heat the raw sheet glue. The heat-insulating component 3 is installed on the body 1, and is used to keep the upper part of the body 1 warm. The driving component 4 is installed on the body 1 and is connected to the heating component 2, and is used to drive the heating component 2. A pretreatment device is arranged in front of the input end of the extruder, and the pretreatment device is provided with a heating component 2 and a heat-insulating component 3, which can preheat the raw sheet glue before the raw sheet glue enters the extruder and maintain a corresponding temperature, thereby reducing the occurrence of poor heat plasticization of the raw sheet glue during the heat plasticization process, reducing the quality problems caused by the heat plasticized rubber, ensuring the transportation efficiency and stability of the product, and ensuring the process operation control of the subsequent process.

[0040] In a preferred embodiment, the body 1 includes: a frame 11, a fixed plate 12, a conveying plate 13, a conveying roller 14 and a mounting plate 15. The fixed plate 12 is mounted on the frame 11 and is used to mount the heating component 2. The conveying plate 13 is mounted on the top of the frame 11, and the heat preservation component 3 is mounted on the conveying plate 13. There are two conveying rollers 14, which are respectively mounted at both ends of the conveying plate 13 and cooperate with the conveying plate 13 to transport the original sheet adhesive. The mounting plate 15 is mounted on the conveying plate 13 and is used to mount the heating component 2 and the driving component 4.

[0041] In a preferred embodiment, the heating assembly 2 includes: a base 21, a temperature control element 22, a delivery pipe 23, a heating roller 24 and a connecting piece 25. The base 21 is mounted on the fixing plate 12. The temperature control element 22 is mounted on the base 21, and is used to accommodate a temperature control medium and control the temperature of the temperature control medium. The delivery pipe 23 is connected to the temperature control element 22. The heating roller 24 is mounted on the mounting plate 15, and is connected to the driving assembly 4, and is connected to the delivery pipe 23 through the connecting piece 25.

[0042] In a preferred embodiment, the temperature control element 22 includes: a housing chamber 221, a heating wire tube 222, a first temperature measuring element 223 and a connection port 224. The housing chamber 221 is installed on the base 21 and is used to accommodate the temperature control medium. The heating wire tube 222 is installed in the housing chamber 221 and is used to control the temperature of the temperature control medium. The first temperature measuring element 223 is installed in the housing chamber 221 and is used to detect the temperature of the temperature control medium. The connection port 224 is installed on the housing chamber 221 and is connected to the delivery pipe 23.

[0043] In a preferred embodiment, the heating roller 24 includes: a roller shaft 241, a central channel 242 and an edge channel 243. The roller shaft 241 is mounted on the mounting plate 15 and connected to the driving assembly 4. The central channel 242 is arranged at the center of the roller shaft 241 and is connected to the conveying pipe 23 through the connecting member 25. The edge channel 243 is arranged at the edge of the roller shaft 241 and is connected to the central channel 242.

[0044] In a preferred embodiment, the driving assembly 4 includes: a mounting seat 41, a driving member 42 and a second gear 43. The mounting seat 41 is mounted on the mounting plate 15. The driving member 42 is mounted on the mounting seat 41. The second gear 43 is connected to the output end of the driving member 42, and the heating roller 24 is provided with a first gear 26, which is connected to the second gear 43.

[0045] In a preferred embodiment, the heat preservation assembly 3 includes: a shell 31, a baffle 32, a cooling element 33, a heating element 34, and a second temperature measuring element 35. The shell 31 is mounted on the conveying plate 13. The baffle 32 is mounted on the front and rear sides of the shell 31. The cooling element 33 is mounted on the top of the shell 31. The heating element 34 is mounted on the left and right sides of the shell 31. The second temperature measuring element 35 is mounted on the left and right sides of the shell 31.

[0046] Based on the same design concept, the present invention provides a control method for a pre-processing device of an original sheet adhesive, characterized by comprising: controlling the temperature of heating the original sheet adhesive by a heating component 2 ; and controlling the insulation temperature above the body 1 by a heat preservation component 3 .

[0047] In a preferred embodiment, the temperature of heating the original sheet adhesive is controlled by the heating component 2, including the following steps: the temperature of the temperature control medium in the accommodating cavity 221 is detected as T1 by the first temperature measuring element 223, and the temperature of the temperature control medium is controlled by the heating wire tube 222 according to the temperature T1, and the control relationship is as follows: 39℃≤T1≤44℃, maintain the current heating temperature.

[0048] 34°C≤T1<39°C, the heating temperature of the heating wire tube 222 is increased by 5°C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0049] 29°C≤T1<34°C, the heating temperature of the heating wire tube 222 is increased by 10°C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0050] T1<29 degrees C, the heating temperature of the heating wire tube 222 is increased by 15 degrees C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0051] 44°C<T1≤49°C, the heating temperature of the heating wire tube 222 is reduced by 5°C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0052] 49°C<T1≤54°C, the heating temperature of the heating wire tube 222 is reduced by 10°C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0053] T1>54°C, the heating temperature of the heating wire tube 222 is reduced by 15°C on the existing basis, and returns to the original temperature after reaching the required temperature.

[0054] In a preferred embodiment, the heat preservation temperature above the fuselage 1 is controlled by the heat preservation component 3, including the following steps: the temperature in the shell 31 is detected as T2 by the second temperature measuring component 35, and the temperature in the shell 31 is controlled by the cooling component 33 and the heating component 34 according to the temperature T2, and the control relationship is as follows: 34℃≤T2≤39℃, maintain the current heating temperature.

[0055] 29°C≤T2<34°C, the heating temperature of the heating element 34 is increased by 5°C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0056] 24°C≤T2<29°C, the heating temperature of the heating element 34 is increased by 10°C on the existing basis, and the original temperature is restored after reaching the required temperature.

[0057] T2<24 degrees Celsius, the heating temperature of the temperature raising component 34 is increased by 15 degrees Celsius on the existing basis, and the original temperature is restored after reaching the required temperature.

[0058] 39℃<T2≤44℃, the heating temperature of the heating component 34 is reduced by 5℃ on the existing basis, and the cooling component 33 is powered on to run. When the temperature requirement is reached, the heating component 34 returns to the original temperature and the cooling component 33 stops running.

[0059] 44℃<T2≤49℃, the heating temperature of the heating component 34 is reduced by 10℃ on the existing basis, and the cooling component 33 is powered on to run. When the temperature requirement is reached, the heating component 34 returns to the original temperature and the cooling component 33 stops running.

[0060] T2>49℃, the heating temperature of the heating component 34 is reduced by 15℃ on the existing basis, and the cooling component 33 is powered on to run. When the temperature requirement is reached, the heating component 34 returns to the original temperature and the cooling component 33 stops running.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] In addition, the terms "above" and "below" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "above" and "below" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A pretreatment device for raw sheet adhesive, characterized in that: include: The body (1) is used for conveying the original adhesive film; A heating component (2) is mounted on the body (1) and is used to heat the original film adhesive; A heat preservation component (3) is installed on the fuselage (1) and is used to keep the upper part of the fuselage (1) warm; A driving component (4) is mounted on the body (1) and connected to the heating component (2), and is used to drive the heating component (2).

2. The pretreatment device for raw film adhesive according to claim 1, characterized in that: The fuselage (1) comprises: Rack(11); A fixing plate (12) mounted on the frame (11) and used for mounting the heating assembly (2); A conveying plate (13) is mounted on the top of the frame (11), and the heat preservation component (3) is mounted on the conveying plate (13); Two conveying rollers (14) are respectively mounted at two ends of the conveying plate (13) and cooperate with the conveying plate (13) to convey the original sheet of adhesive; A mounting plate (15) is mounted on the conveying plate (13) and is used for mounting the heating component (2) and the driving component (4).

3. The pretreatment device for raw sheet adhesive according to claim 2, characterized in that: The heating component (2) comprises: A base (21) mounted on the fixing plate (12); A temperature control element (22) is mounted on the base (21) and is used to contain a temperature control medium and control the temperature of the temperature control medium; A delivery pipe (23) connected to the temperature control element (22); The heating roller (24) is mounted on the mounting plate (15), connected to the driving assembly (4), and connected to the conveying pipe (23) via a connecting piece (25).

4. The pretreatment device for raw sheet adhesive according to claim 3, characterized in that: The temperature control element (22) comprises: An accommodating chamber (221), mounted on the base (21), and used for accommodating the temperature control medium; A heating wire tube (222), installed in the accommodating cavity (221), and used to control the temperature of the temperature control medium; A first temperature measuring element (223), installed in the accommodating cavity (221), and used to detect the temperature of the temperature control medium; A connecting port (224) is installed on the accommodating cavity (221) and is connected to the delivery pipe (23).

5. The pretreatment device for raw sheet adhesive according to claim 3, characterized in that: The heating roller (24) comprises: A roller shaft (241) is mounted on the mounting plate (15) and connected to the driving assembly (4); A central channel (242) is arranged at the center of the roller shaft (241) and is connected to the conveying pipe (23) via the connecting piece (25); An edge channel (243) is arranged at an edge position of the roller shaft (241) and is connected to the central channel (242).

6. The pretreatment device for raw sheet adhesive according to claim 3, characterized in that: The driving component (4) comprises: A mounting seat (41) mounted on the mounting plate (15); A driving member (42) mounted on the mounting seat (41); The second gear (43) is connected to the output end of the driving member (42). The heating roller (24) is provided with a first gear (26), and the first gear (26) is connected to the second gear (43).

7. The pretreatment device for raw film adhesive according to claim 2, characterized in that: The thermal insulation component (3) comprises: A housing (31) mounted on the conveying plate (13); Baffles (32) are mounted on the front and rear sides of the housing (31); A cooling element (33) installed on the top of the housing (31); A temperature raising element (34) is installed on the left and right sides of the shell (31); The second temperature measuring element (35) is installed on the left and right sides of the shell (31).

8. A control method for a pre-treatment device for raw sheet adhesive according to any one of claims 1 to 7, characterized in that: include: Controlling the temperature of heating the original sheet adhesive by means of a heating component (2); The insulation temperature above the body (1) is controlled by the insulation component (3).

9. The control method according to claim 8, characterized in that: The temperature of heating the original sheet adhesive is controlled by a heating component (2), comprising the following steps: The temperature of the temperature-control medium in the accommodating chamber (221) is detected as T1 by the first temperature measuring element (223), and the temperature of the temperature-control medium is controlled by the heating wire tube (222) according to the temperature T1, and the control relationship is as follows: 39℃≤T1≤44℃, maintain the current heating temperature; 34°C≤T1<39°C, the heating temperature of the heating wire tube (222) is increased by 5°C on the existing basis, and the original temperature is restored after reaching the required temperature; 29°C≤T1<34°C, the heating temperature of the heating wire tube (222) is increased by 10°C on the existing basis, and the original temperature is restored after reaching the required temperature; T1<29°C, the heating temperature of the heating wire tube (222) is increased by 15°C on the existing basis, and the original temperature is restored after reaching the required temperature; 44°C<T1≤49°C, the heating temperature of the heating wire tube (222) is reduced by 5°C on the existing basis, and the original temperature is restored after reaching the required temperature; 49°C<T1≤54°C, the heating temperature of the heating wire tube (222) is reduced by 10°C on the existing basis, and the original temperature is restored after reaching the required temperature; When T1>54°C, the heating temperature of the heating wire tube (222) is reduced by 15°C on the existing basis, and the original temperature is restored after reaching the required temperature.

10. The control method according to claim 8, characterized in that: Controlling the insulation temperature above the body (1) by means of the insulation component (3) comprises the following steps: The temperature inside the shell (31) is detected as T2 by the second temperature measuring element (35), and the temperature inside the shell (31) is controlled according to the temperature T2 by the temperature reducing element (33) and the temperature increasing element (34), and the control relationship is as follows: 34℃≤T2≤39℃, maintain the current heating temperature; 29°C≤T2<34°C, the heating temperature of the heating element (34) is increased by 5°C on the existing basis, and the original temperature is restored after reaching the required temperature; 24°C≤T2<29°C, the heating temperature of the heating element (34) is increased by 10°C on the existing basis, and the original temperature is restored after reaching the required temperature; When T2 is less than 24°C, the heating temperature of the heating element (34) is increased by 15°C on the existing basis, and the original temperature is restored after reaching the required temperature; 39°C<T2≤44°C, the heating temperature of the heating element (34) is reduced by 5°C on the existing basis, and the cooling element (33) is powered on and operated. When the temperature requirement is reached, the heating element (34) returns to the original temperature, and the cooling element (33) stops operating; 44°C<T2≤49°C, the heating temperature of the heating element (34) is reduced by 10°C on the existing basis, and the cooling element (33) is powered on and operated. When the temperature requirement is reached, the heating element (34) returns to the original temperature, and the cooling element (33) stops operating; When T2>49°C, the heating temperature of the heating element (34) is reduced by 15°C on the existing basis, and the cooling element (33) is powered on to operate. When the required temperature is reached, the heating element (34) returns to the original temperature, and the cooling element (33) stops operating.

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