Air knife device and coating machine

Abstract

The utility model discloses an air knife device and a coating machine, and relates to the technical field of battery production equipment, the air knife device comprises a heater, an air pipe, an air knife and a temperature control assembly; the heater is configured to heat a gas source flowing through the heater; the air pipe communicates with an outlet of the heater; an air inlet of the air knife communicates with the air pipe; the temperature control assembly is arranged on the air knife and is configured to detect the temperature of the air source flowing through the air outlet of the air knife and control the heating temperature of the air source flowing through the air outlet of the air knife. According to the technical scheme provided by the utility model, the air knife device capable of accurately controlling the output temperature of the air source is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production equipment technical field, especially a kind of air knife device and coating machine. BACKGROUND

[0002] Coating machine is widely used in lithium battery, solar photovoltaic etc. industry, and the air knife device of coating machine forms high-strength compressed air (air source) by air knife, which rapidly removes solvent in product, thereby promoting product forming. The air knife device in the related art cannot accurately control the output temperature of the air source. SUMMARY

[0003] In view of the above problems, the present application provides an air knife device and a coating machine, which aims to provide an air knife device capable of accurately controlling the output temperature of the air source.

[0004] The present application provides an air knife device, comprising a heater, an air pipe, an air knife and a temperature control assembly; the heater is configured to heat the air source flowing therethrough; the air pipe is connected to the outlet of the heater; the air inlet of the air knife is communicated with the air pipe; the temperature control assembly is arranged in the air knife and is configured to detect the temperature of the air source flowing through the air outlet of the air knife and control the heating temperature of the air source flowing through the air outlet of the air knife.

[0005] In the technical scheme of the present application, the air source is preheated by the heater, and the preheated air source is delivered to the air inlet of the air knife through the air pipe. After the air source enters the air knife from the air inlet, the temperature control assembly re-heats the air source flowing through the air knife, and at the same time, the temperature control assembly detects the temperature of the air source flowing through the air outlet of the air knife. When the temperature of the air source flowing through the air outlet of the air knife exceeds the preset temperature, the heating temperature of the air source flowing through the air outlet of the air knife is controlled until the temperature of the air source flowing through the air outlet of the air knife is within the preset temperature. In this way, the output temperature of the air source can be accurately controlled under the action of the heater and the temperature control assembly.

[0006] In some embodiments, the air pipe is provided with a heating element configured to heat the air source flowing through the air pipe. In this design, the preheated air source can be further heated by the heating element on the air pipe during the delivery process, which can improve the situation that the temperature control assembly in the air knife cannot heat the air source to the preset temperature within the preset time due to excessive heat loss during the delivery process. Therefore, during the process of the air source flowing through the heater, the air pipe and the air knife in sequence, the air source will be subjected to three-stage heating, i.e. one heating when flowing through the heater, two heating when flowing through the air pipe and three heating when flowing through the air knife. This not only reduces heat loss during the delivery process, but also improves the heating efficiency of the air source and accurately controls the output temperature of the air source.

[0007] In some embodiments, the heating member is a heat protection sleeve sleeved on the air pipe. Due to the small size of the air pipe, the installation space inside the air pipe is small, and it is difficult to install the heating member inside the air pipe. Therefore, by designing the heating member as a heat protection sleeve sleeved on the outside of the air pipe, the installation of the heating member is facilitated.

[0008] In some embodiments, the temperature control assembly includes a detection element and a heating element. The detection element is arranged at the air outlet of the air knife and is used to detect the temperature of the air source flowing through the air outlet of the air knife. The heating element is arranged in the air knife and is used to heat the air source flowing through the air knife. The heating element is in communication connection with the detection element. In this design, after the air source enters the air knife from the air inlet, it first flows through the heating element, and the heating element heats the air source. When the heated air source flows through the air outlet of the air knife, the detection element detects the temperature of the air source flowing through the air outlet of the air knife. When the temperature of the air source flowing through the air outlet of the air knife is detected to be higher than the preset temperature, the detection element feeds back a signal to the control end of the coating machine, and then the control end controls the power of the heating element to control the heating temperature of the air source flowing through the air knife, until the temperature of the air source flowing through the air outlet of the air knife is within the preset temperature. In this way, the output temperature of the air source can be accurately controlled.

[0009] In some embodiments, the detection element includes a thermocouple. In this design, by using a thermocouple as the detection element, the detection accuracy is higher and the cost is lower.

[0010] In some embodiments, the detection element further includes a temperature control meter in communication connection with the thermocouple. The temperature control meter is used to display the temperature of the air source detected by the thermocouple. In this design, when the thermocouple detects the temperature of the air source flowing through the air outlet of the air knife, the corresponding temperature value of the air source can be fed back to the temperature control meter for display and reminder, so that the user can observe the current output temperature of the air source in the first time, and the user can be reminded to adjust the temperature or directly adjust the temperature through the control end.

[0011] In some embodiments, the heating element includes a heating wire. In this design, by using a heating wire as the heating element, the heating efficiency is higher and the cost is lower.

[0012] In some embodiments, the heating element includes a plurality of heating wires. The plurality of heating wires are distributed in the air knife in a spaced manner, and the heating wires are arranged in the length direction of the air knife. In this design, the design of the plurality of heating wires and the arrangement of the heating wires in the length direction of the air knife can uniformly heat the air source flowing through, so as to avoid a large temperature difference of the air source output from the air outlet of the air knife, which affects the drying effect of the product and further affects the quality of the product.

[0013] In some embodiments, the air inlet of the air knife is provided with a tracheal joint, and the trachea is connected to the tracheal joint away from the heater. Such a design is more convenient for disassembling the trachea to facilitate the communication between the trachea and the air inlet of the air knife.

[0014] The application also provides a coating machine, comprising a workbench, a mounting frame and the air knife device, the mounting frame is arranged on the workbench, and the air knife device is arranged on the mounting frame.

[0015] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, and can be implemented according to the content of the specification, and in order to make other purposes, features and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the structures shown in these drawings.

[0017] Figure 1 Part structure schematic diagram of an embodiment of the coating machine of the application;

[0018] Figure 2 Heating control schematic diagram of an embodiment of the air knife device of the application;

[0019] Figure 3 Thermocouple feedback schematic diagram of an embodiment of the air knife device of the application.

[0020] Explanation of reference numerals:

[0021] Reference Name Reference Name 100 Coater 141 Thermocouple 10 Air knife device 142 Heating wire 11 Heater 15 Air tube joint 12 Air tube 20 Workbench 13 Air knife 30 Mounting frame 14 Temperature control assembly

[0022] The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0023] The embodiments of the technical scheme of the application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the application, and therefore only serve as examples, and cannot limit the protection scope of the application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0026] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and is not intended to indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0029] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", etc. should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] Lithium ion battery as a new type of secondary battery, has energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, green environmental protection and other advantages, in portable electrical appliances, electric tools, large energy storage, electric power source and so on has broad application prospect.

[0031] Coating machine is widely used in lithium battery, solar photovoltaic industry, coating machine air knife device by air knife formed by high strength compressed air (air source) will be the solvent in the product quickly away, so as to promote the product forming. The air knife device in the related art cannot accurately control the output temperature of the air source.

[0032] Based on the above problems, the utility model provides a kind of air knife device 10, to provide a kind of air knife device 10 that can accurately control air source output temperature.

[0033] Please refer to Figures 1 to 3 In an embodiment of the utility model, the air knife device 10 includes heater 11, air pipe 12, air knife 13 and temperature control assembly 14;Heater 11 is configured to heat the air source flowing through;Air pipe 12 is communicated with the outlet of heater 11;The air inlet of air knife 13 is communicated with air pipe 12;Temperature control assembly 14 is located in air knife 13, and is configured to detect the temperature of the air source flowing through the air outlet of air knife 13, and control the heating temperature of the air source flowing through the air outlet of air knife 13.

[0034] It can be understood that heater 11 is the equipment that can heat the air source flowing through, for example, heater 11 includes shell, shell is equipped with import and export, shell inside is equipped with heating element such as electric heating wire, electric heating plate, air source imports air shell inside after, will be heat exchanged with the heating element inside shell, to preheat the air source, preheated air source flows to air pipe 12 from export, thereby playing the effect of preheating the air source.And, when air source flows through heater 11, heater 11 can adjust the heating temperature of air source as required, to obtain air source of different temperature.

[0035] It should be noted that the air source is compressed air, and the compressed air is air compressed by a compression device in a previous process.

[0036] In this embodiment, air pipe 12 is a connecting pipe connecting the outlet of heater 11 and the air inlet of air knife 13, which can be a hose or a hard pipe.

[0037] In actual application, the number of the air pipes 12 can be one, two, three, four or more, which is determined according to the actual demand of the air source, and is not limited here. Correspondingly, the number of the outlets of the heater 11 and the number of the air inlets of the air knife 13 correspond to the number of the air pipes 12. In an embodiment, the air knife 13 is provided with air inlets on both sides, and the air pipes 12 and the outlets of the heater 11 are each provided with two air pipes 12, one end of one of the air pipes 12 is connected to one of the outlets of the heater 11, and the other end is connected to the air inlet on one side of the air knife 13, one end of the other air pipe 12 is connected to the other outlet of the heater 11, and the other end is connected to the air inlet on the other side of the air knife 13.

[0038] In this embodiment, the air knife 13 is used to blow high-strength compressed air to the product to quickly take away the solvent in the product, thereby promoting the molding of the product. Since the temperature of the compressed air output from the air knife 13 can be accurately controlled, the solidification and drying speed of the product can be accelerated, and the work efficiency is improved.

[0039] In summary, in the technical scheme of the embodiment of the present application, the technical scheme of the utility model preheats the air source by the heater 11, and the preheated air source is delivered to the air inlet of the air knife 13 through the air pipe 12. After the air source enters the air knife 13 from the air inlet, the temperature control assembly 14 first reheats the air source flowing through the air knife 13, and at the same time, the temperature control assembly 14 detects the temperature of the air source flowing through the air outlet of the air knife 13. When it is detected that the temperature of the air source flowing through the air outlet of the air knife 13 exceeds the preset temperature, the heating temperature of the air source flowing through the air outlet of the air knife 13 is controlled until the temperature of the air source flowing through the air outlet of the air knife 13 is within the preset temperature. In this way, the output temperature of the air source can be accurately controlled under the action of the heater 11 and the temperature control assembly 14.

[0040] In an embodiment of the present application, referring to Figure 1 The air pipe 12 is provided with a heating member configured to heat the air source flowing through the air pipe 12.

[0041] It can be understood that the heating member is a structural member that can heat the flowing air source, for example, a heating element such as an electric heating wire or an electric heating plate.

[0042] The design can further heat the gas source flowing through the air pipe 12 by the heating member on the air pipe 12 during the process of being delivered by the preheated gas source through the air pipe 12, so as to improve the situation that the temperature control assembly 14 in the air knife 13 cannot heat the gas source to the preset temperature within the preset time due to excessive heat loss during the delivery process. Therefore, the gas source is subjected to three-stage heating during the process of sequentially flowing through the heater 11, the air pipe 12 and the air knife 13, that is, the gas source is subjected to first heating when flowing through the heater 11, second heating when flowing through the air pipe 12, and third heating when flowing through the air knife 13, so as to reduce heat loss during the delivery process, improve the heating efficiency of the gas source, and accurately control the output temperature of the gas source.

[0043] In actual application, the heating member can be arranged inside the air pipe 12 or outside the air pipe 12, as long as it can heat the gas source flowing through the air pipe 12.

[0044] In an embodiment of the present application, referring to Figure 1 The heating member is a heat protection sleeve sleeved on the air pipe 12.

[0045] The design is more convenient for installing the heating member by sleeving the heating member on the air pipe 12 as a heat protection sleeve, because the air pipe 12 has a small size and a small internal installation space, and it is difficult to install the heating member inside the air pipe 12.

[0046] In actual application, the heat protection sleeve can be wound outside the air pipe 12, or can be fixed and installed outside the air pipe 12 by means of adhesion, screw connection, clamping and the like.

[0047] In an embodiment of the present application, referring to Figures 1 to 3 The temperature control assembly 14 includes a detection element and a heating element. The detection element is arranged at the air outlet of the air knife 13 and is used for detecting the temperature of the gas source flowing through the air outlet of the air knife 13. The heating element is arranged in the air knife 13 and is used for heating the gas source flowing through the air knife 13. The heating element is in communication connection with the detection element.

[0048] It can be understood that the communication connection between the heating element and the detection element means that the signal detected by the detection element can be fed back to the control end, and the power of the heating element can be controlled through the control end.

[0049] The air source enters the air knife 13 from the air inlet, first flows through the heating element, and the air source is heated by the heating element. When the air source heated flows through the air outlet of the air knife 13, the detection element detects the temperature of the air source flowing through the air outlet of the air knife 13. When the temperature of the air source flowing through the air outlet of the air knife 13 is detected to exceed the preset temperature, the detection element feeds back a signal to the control end of the coating machine 100, and the power of the heating element is controlled by the control end to control the heating temperature of the air source flowing through the air knife 13, until the temperature of the air source flowing through the air outlet of the air knife 13 is within the preset temperature. In this way, the output temperature of the air source can be accurately controlled.

[0050] In actual application, the detection element can be a thermocouple 141, a thermal resistance, a thermometer or the like. The heating element can be a heating wire 142 (resistance wire heater), an electromagnetic heater, an infrared heater, a PTC heater or the like. It should be noted that the PTC heater, also known as a PTC heating body, is composed of a PTC ceramic heating element and an aluminum pipe. This type of PTC heater has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant temperature and power-saving electric heater. The outstanding feature is safety performance. In any application, it will not produce the surface "red" phenomenon like the electric heating tube type heater, thereby causing burns, fires and other safety hazards.

[0051] In an embodiment of the present application, in combination with reference to Figures 1 to 3 , the detection element includes a thermocouple 141. In this design, the thermocouple 141 is used as the detection element, which has higher detection accuracy and lower cost.

[0052] In an embodiment of the present application, in combination with reference to Figure 1 、 Figure 2 , the detection element further includes a temperature control meter, which is in communication connection with the thermocouple 141, and is used to display the air source temperature detected by the thermocouple 141.

[0053] In this design, when the thermocouple 141 detects the temperature of the air source flowing through the air outlet of the air knife 13, the corresponding temperature value of the air source can be fed back to the temperature control meter for display and reminder, so that the user can observe the current output temperature of the air source in the first time, to remind the user to adjust the temperature, or directly adjust the temperature through the control end.

[0054] It should be noted that the temperature control meter is provided with a temperature upper and lower limit alarm range (preset temperature). When the temperature value displayed by the temperature control meter exceeds the upper and lower limit alarm range, an alarm is given, and the alarm information is output to the control end of the coating machine 100, and is displayed on the control screen of the coating machine 100 and controls the power of the heating element.

[0055] In an embodiment of the present application, in combination with reference to Figures 1 to 3The heating element comprises a heating wire 142.

[0056] It can be understood that the heating wire 142, i.e. the resistance wire heater 11, is one of the most common electric heating elements. It is composed of one or more filament-like metal conductors, such as nickel-chromium alloy (nickel-chromium), iron-chromium-aluminum alloy, etc. When the electric current passes through the conductor, the resistance wire will heat up, converting the electric energy into heat energy.

[0057] In an embodiment of the present application, in combination with the above Figure 1 The heating element comprises a plurality of heating wires 142, which are distributed in the air knife 13 at intervals, and the heating wires 142 are arranged along the length direction of the air knife 13.

[0058] Such a design, the design of the plurality of heating wires 142, and the arrangement of the heating wires 142 along the length direction of the air knife 13 can uniformly heat the air source flowing through, avoid the large temperature difference of the air source output from the air outlet of the air knife 13, and affect the drying effect on the product, thereby affecting the quality of the product.

[0059] In actual application, the plurality of heating wires 142 can be connected in parallel or in series, which is not specifically limited here.

[0060] In an embodiment of the present application, in combination with the above Figure 1 The air inlet of the air knife 13 is provided with an air pipe joint 15, and the end of the air pipe 12 away from the heater 11 is connected to the air pipe joint 15.

[0061] Such a design is more convenient for disassembling the air pipe 12 to realize the communication between the air pipe 12 and the air inlet of the air knife 13.

[0062] In combination with the above Figure 1 The utility model also provides a coating machine 100, the coating machine 100 includes workstation 20, mounting bracket 30 and air knife device 10, the specific structure of air knife device 10 refers to the above embodiment, because the coating machine 100 of the utility model adopts all the technical schemes of the above all embodiments, therefore at least has all the beneficial effects brought by the technical scheme of the above embodiment, here will not repeat again. Among them, mounting bracket 30 is located at workstation 20, and air knife device 10 is located at mounting bracket 30.

[0063] According to some embodiments of the present application, the present application provides an air knife device 10, in combination with the above Figure 1 , Figure 2The air knife device 10 comprises a heater 11, an air pipe 12, an air knife 13 and a temperature control assembly 14; the heater 11 is configured to heat the air source flowing therethrough; the air pipe 12 is communicated with the outlet of the heater 11; the air inlet of the air knife 13 is communicated with the air pipe 12; the temperature control assembly 14 is arranged on the air knife 13 and is configured to detect the temperature of the air source flowing through the air outlet of the air knife 13 and control the heating temperature of the air source flowing through the air knife 13. The temperature control assembly 14 comprises a detection element and a heating element, the detection element comprises a thermocouple 141, and the heating element comprises a heating wire 142; the air pipe 12 is sleeved with a heat protection sleeve.

[0064] In the technical scheme of the embodiment, the heater 11 is used to preheat the air source; the preheated air source is secondarily heated by the heat protection sleeve outside the air pipe 12 during the conveying process of the air pipe 12, so that the temperature control assembly 14 in the air knife 13 cannot heat the air source to the preset temperature within the preset time due to excessive heat loss during the conveying process can be improved. After the air source enters the air knife 13 from the air inlet, the air source flows through the heating element first, and the air source is heated three times by the heating element. When the temperature of the air source flowing through the air outlet of the air knife 13 is detected by the detection element, the detection element feeds back a signal to the control end of the coating machine 100 when the temperature of the air source flowing through the air outlet of the air knife 13 exceeds the preset temperature, and then controls the power of the heating element through the control end to control the heating temperature of the air source flowing through the air knife 13 until the temperature of the air source flowing through the air outlet of the air knife 13 is within the preset temperature. In this way, the output temperature of the air source can be accurately controlled.

[0065] The above is only an exemplary embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields within the technical concept of the present application is included in the patent protection range of the present application.

Claims

1. A wind knife arrangement, characterized in that The air pipe is provided with a heating element configured to heat the air source flowing through the air pipe. The heating element is a heat protection sleeve sleeved on the air pipe. The temperature control assembly comprises: a detection element arranged at the air outlet of the air knife for detecting the temperature of the air source flowing through the air outlet of the air knife; a heating element arranged in the air knife for heating the air source flowing through the air knife, the heating element being in communication connection with the detection element.

2. The air knife assembly of claim 1, wherein, The detection element comprises a thermocouple.

3. The air knife assembly of claim 2, wherein, The detection element further comprises a temperature control meter in communication connection with the thermocouple, the temperature control meter being used to display the temperature of the air source detected by the thermocouple.

4. The air knife device of any one of claims 1 to 3, wherein, The heating element comprises a heating wire. The heating element comprises a plurality of heating wires, the plurality of heating wires being distributed in the air knife at intervals, and the heating wires being arranged in the length direction of the air knife. The air inlet of the air knife is provided with an air pipe joint, and the air pipe is connected to the air pipe joint away from the heater.

5. The air knife assembly of claim 4, wherein, The air pipe is provided with a heating element configured to heat the air source flowing through the air pipe.

6. The air knife assembly of claim 5, wherein, The heating element is a heat protection sleeve sleeved on the air pipe.

7. The air knife assembly of claim 4, wherein, The temperature control assembly comprises:

8. The air knife assembly of claim 7, wherein, a detection element arranged at the air outlet of the air knife for detecting the temperature of the air source flowing through the air outlet of the air knife; 9. The air knife device of any one of claims 1 to 3, wherein, a heating element arranged in the air knife for heating the air source flowing through the air knife, the heating element being in communication connection with the detection element.

10. A coater characterized by comprising: The detection element comprises a thermocouple. The detection element further comprises a temperature control meter in communication connection with the thermocouple, the temperature control meter being used to display the temperature of the air source detected by the thermocouple. The heating element comprises a heating wire. The heating element comprises a plurality of heating wires, the plurality of heating wires being distributed in the air knife at intervals, and the heating wires being arranged in the length direction of the air knife. The air inlet of the air knife is provided with an air pipe joint, and the air pipe is connected to the air pipe joint away from the heater. The air pipe is provided with a heating element configured to heat the air source flowing through the air pipe. The heating element is a heat protection sleeve sleeved on the air pipe. The temperature control assembly comprises: a detection element arranged at the air outlet of the air knife for detecting the temperature of the air source flowing through the air outlet of the air knife; a heating element arranged in the air knife for heating the air source flowing through the air knife, the heating element being in communication connection with the detection element. The detection element comprises a thermocouple. The detection element further comprises a temperature control meter in communication connection with the thermocouple, the temperature control meter being used to display the temperature of the air source detected by the thermocouple. The heating element comprises a heating wire. The heating element comprises a plurality of heating wires, the plurality of heating wires being distributed in the air knife at intervals, and the heating wires being arranged in the length direction of the air knife. The air inlet of the air knife is provided with an air pipe joint, and the air pipe is connected to the air pipe joint away from the heater. The air pipe is provided with a heating element configured to heat the air source flowing through the air pipe. The heating element is a heat protection sleeve sleeved on the air pipe. The temperature control assembly comprises: a detection element arranged at the air outlet of the air knife for detecting the temperature of the air source flowing through the air outlet of the air knife; a heating element arranged in the air knife for heating the air source flowing through the air knife, the heating element being in communication connection with the detection element. The detection element comprises a thermocouple. The detection element further comprises a temperature control meter in communication connection with the thermocouple, the temperature control meter being used to display the temperature of the air source detected by the thermocouple. The heating element comprises a heating wire. The heating element comprises a plurality of heating wires, the plurality of heating wires being distributed in the air knife at intervals, and the heating wires being arranged in the length direction of the air knife. The air inlet of the air knife is provided with an air pipe joint, and the air pipe is connected

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