A plastic welding machine heating plate

Abstract

This utility model relates to the field of heating plate technology, and more particularly to a heating plate for a plastic welding machine. It mainly addresses the problems of uneven surface temperature distribution, easy adhesion of plastic that is difficult to clean, and inconvenient maintenance and replacement in existing plastic welding heating plates, thus affecting welding efficiency and quality. The proposed technical solution includes a welding machine body, a fixed arm mounted on the welding machine body, and a heating plate body mounted on one side of the fixed arm. The heating plate body includes a frame, an infrared heating element installed in the frame, and ceramic plates on both sides of the infrared heating element. A wiring harness is connected to the heating plate body, with a pluggable terminal block connected to the end of the wiring harness away from the heating plate body. This utility model effectively solves the problems of uneven temperature distribution, easy adhesion and difficult cleaning, and inconvenient maintenance and replacement in existing heating plates, significantly improving plastic welding efficiency and quality while reducing maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of heating plate technology, and in particular to a heating plate for a plastic welding machine. Background Technology

[0002] Thermoplastic plastics, as a class of polymer materials with unique properties, exhibit a linear molecular structure. They are plastic at certain temperatures, solidify upon cooling, and this process can be repeated. Because they generally lack active groups, linear intermolecular cross-linking does not occur when heated, allowing recycled thermoplastic products to be reprocessed into new products. This class of plastics encompasses many varieties, including polyolefins (vinyl, olefin, styrene, etc.) and cellulose, demonstrating excellent mechanical, electrical, and chemical resistance properties. Compared to metal materials, they also offer advantages such as lighter weight, ease of design for complex products, and lower molding energy consumption. They are widely used in microelectronics, biomedical engineering, and energy industries. Many plastics, such as polypropylene (PP) and high-density polyethylene (HDPE), can be welded using thermoforming methods.

[0003] In existing plastic welding technologies, the two parts to be welded are typically placed on either side of a heating plate for preheating. Once molten, they are pressed together to achieve welding. However, existing heating plate technology has several drawbacks: firstly, the uneven temperature distribution on the surface of ordinary heating plates severely affects the melting efficiency and welding quality; secondly, molten plastic easily adheres to the surface of the heating plate, making cleaning difficult; and thirdly, the heating plate is inconvenient to operate during maintenance and replacement. These problems urgently need to be solved. Therefore, this utility model proposes a heating plate for a plastic welding machine. Utility Model Content

[0004] The purpose of this invention is to address the problems of uneven surface temperature distribution, easy adhesion of plastic to existing plastic welding heating plates, difficulty in cleaning, and difficulty in maintenance and replacement, which affect welding efficiency and quality. This invention proposes a new type of plastic welding heating plate.

[0005] The technical solution of this utility model is as follows: A plastic welding machine heating plate includes a welding machine body, a fixed arm installed on the welding machine body, and a heating plate body installed on one side of the fixed arm. The heating plate body includes a frame, an infrared heating element is installed in the frame, and ceramic plates are provided on both sides of the infrared heating element. A wire harness is connected to the heating plate body, and a pluggable terminal block is connected to the end of the wire harness away from the heating plate body.

[0006] Optionally, the heating plate body further includes a first panel disposed on the side of the frame near the wire harness, and a second panel disposed on the side of the frame away from the first panel. The second panel is arranged in a "U" shape, and the first panel and the second panel are connected by bolts.

[0007] Optionally, the fixed arm is arranged on the side of the frame away from the second panel, and multiple groups of heat insulation sleeves are arranged between the second panel and the fixed arm. Bolts slidingly installed in the heat insulation sleeves connect the second panel and the fixed arm.

[0008] Optionally, the frame is arranged in a "冂" shape, and a temperature switch is installed inside the frame.

[0009] Optionally, a sensor fixing block fixedly connected to the inside of the frame, and a temperature sensor is installed on the sensor fixing block.

[0010] Optionally, the maximum temperature of the infrared heating sheet is 450 °C.

[0011] Optionally, the ceramic plate is made of boron nitride material, and an anti-sticking layer is provided on the side of the ceramic plate away from the infrared heating sheet.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] The utility model quickly and evenly conducts the heat generated by the infrared heating sheet to the welding surface through the super heat conduction rate characteristic of the boron nitride ceramic plate, so that the surface temperature distribution of the ceramic plate is uniform, and the maximum temperature difference between the inner and outer regions is less than 5 °C. At the same time, combined with the precise temperature control system composed of a temperature sensor and a temperature switch, precise temperature control of ±0.1 °C and over-temperature automatic power-off protection are realized, significantly improving the hot-melt efficiency and welding quality compared with traditional heating plates, and effectively avoiding problems such as insufficient welding strength caused by uneven temperature;

[0014] Furthermore, by adopting the design of a pluggable terminal block, the heating plate body and the welder circuit can be quickly connected and separated, which is convenient for maintenance and replacement. The first panel and the second panel are connected by bolts passing through two groups of ceramic plates, which is convenient for disassembling internal components; the anti-sticking layer on the surface of the ceramic plate reduces the cleaning frequency. In addition, the heat insulation sleeve reduces the temperature of the fixed arm by more than 60%, effectively protecting the welder structural parts, extending the overall service life of the equipment, and reducing the maintenance cost;

[0015] In summary, the utility model effectively solves the problems of uneven temperature, easy adhesion and difficult cleaning, and inconvenient maintenance and replacement of the existing heating plate, significantly improving the plastic welding efficiency, quality and reducing the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of a heating plate for a plastic welder is given;

[0017] Figure 2 It is a structural schematic diagram of the heating plate body;

[0018] Figure 3 It is a disassembled structural schematic diagram of the heating plate body.

[0019] Figure label:

[0020] 1. Welding machine body; 2. Fixing arm; 3. Heating plate body; 4. Wiring harness; 5. Pluggable terminal block;

[0021] 31. Frame; 32. Infrared heating element; 33. Ceramic plate; 34. First panel; 35. Second panel; 36. Heat insulation sleeve; 37. Temperature switch; 38. Sensor fixing block; 39. Temperature sensor. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0023] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0024] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example

[0028] like Figure 1 As shown, the plastic welding machine heating plate proposed in this utility model includes a welding machine body 1 and a fixed arm 2 installed on the welding machine body 1. Both are existing technologies and will not be described in detail here.

[0029] For details, please refer to Figures 1 to 3The aforementioned heating plate also includes a heating plate body 3 installed on one side of the fixed arm 2. The heating plate body 3 includes a frame 31, which is U-shaped and integrally formed from aluminum alloy, featuring lightweight and high strength characteristics, facilitating the assembly and installation of other components. An infrared heating element 32 is installed in the frame 31. The infrared heating element 32 uses graphene composite heating wire, with a maximum temperature of 450℃, a heating response time of less than 10 seconds, and an electrothermal conversion efficiency of over 95%, facilitating the provision of temperature for molten plastic. Ceramic plates 33 are provided on both sides of the infrared heating element 32. The ceramic plates 33 are made of boron nitride material. By using a material with superconductivity, they have good temperature transfer efficiency, with a thermal conductivity of 300W / (m·K), reducing heat loss. At the same time, the surface temperature distribution of the ceramic plates 33 is more uniform, with a maximum temperature difference of less than 5℃ between the inner and outer areas, improving the synchronization of welding heating. Furthermore, an anti-stick layer is provided on the side of the ceramic plate 33 away from the infrared heating element 32. The surface of the ceramic plate 33 can be treated with nanocrystallization to form a 0.1mm thick anti-stick layer with a surface roughness Ra≤0.1μm, effectively reducing the adhesion of the molten plastic. The heating plate body 3 also includes a first panel 34 disposed on the side of the frame 31 near the wire harness 4, and a second panel 35 installed on the side of the frame 31 away from the first panel 34. The second panel 35 is arranged in a "U" shape. The first panel 34 and the second panel 35 are connected by M4 stainless steel bolts, and the bolts pass through both sets of ceramic plates 33 to lock the overall structure. The bolt preload is 8~10N·m to ensure the stability of the connection. The fixed arm 2 is located on the side of the frame 31 away from the second panel 35. Two sets of heat insulation sleeves 36 are provided between the second panel 35 and the fixed arm 2. The heat insulation sleeves 36 are made of aerogel felt material with a thermal conductivity of ≤0.018W / (m·K). The second panel 35 and the fixed arm 2 are connected by bolts that are slidably installed in the heat insulation sleeves 36. The heating plate body 3 is fixed to the side of the fixed arm 2 by bolts. At the same time, heat transfer can be reduced, heat loss can be reduced, and the temperature of the fixed arm 2 can be reduced, thus extending its service life. A temperature switch 37 is installed inside the frame 31. The operating temperature of the temperature switch 37 is 480℃. A sensor fixing block 38 is fixedly connected to the inside of the frame 31. The sensor fixing block 38 is fixed with a thermally conductive silicone pad with a thermal conductivity of 2.0W / (m·K). A temperature sensor 39 is installed on the sensor fixing block 38. The temperature sensor 39 has an accuracy of ±0.1℃. The heating temperature is monitored in real time through the temperature switch 37 and the temperature sensor 39. The sampling frequency is 10Hz. At the same time, when the temperature is too high, the infrared heating element 32 is turned off by the temperature switch 37 to achieve over-temperature protection. The response time is less than 0.5 seconds.

[0030] Furthermore, the heating plate also includes a wiring harness 4 connected to the heating plate body 3. The wiring harness 4 is made of high-temperature resistant silicone insulation wire with a temperature resistance rating of -60℃ to 200℃. The end of the wiring harness 4 away from the heating plate body 3 is connected to a pluggable terminal block 5. A separate pluggable terminal block 5 is provided for connection through the heating plate body 3 to facilitate maintenance and replacement. The insertion and extraction force is ≤5N and the contact resistance is ≤10mΩ to ensure the reliability of the electrical connection.

[0031] In this embodiment, when the welding machine is started, current flows through the graphene composite heating wire in the infrared heating element 32. This infrared heating element 32 has an electrothermal conversion efficiency of over 95%, and can rapidly heat to the set temperature (maximum 450℃) within 10 seconds. This heating method directly radiates infrared rays, reducing heat conduction loss and improving heating efficiency. The generated heat is rapidly conducted through the boron nitride ceramic plates 33 on both sides of the infrared heating element 32. The thermal conductivity of boron nitride material is as high as 300 W / (m·K), ensuring uniform heat distribution and keeping the temperature difference on the surface of the ceramic plates 33 within 5℃, achieving synchronous melting of the plastic welding surface. The high hardness (Mohs hardness 9) of the boron nitride ceramic plates 33 ensures that it does not deform under pressure, guaranteeing the accuracy of subsequent welding.

[0032] The uniform high temperature of the ceramic plate 33 contacts the surface of the plastic weldment, causing the thermoplastic to quickly reach a molten state. A 0.1mm thick anti-stick layer formed on the surface of the ceramic plate 33 through nano-crystallization treatment effectively reduces plastic adhesion and prevents molten residue. Once the plastic reaches a suitable molten state, the heating plate body 3 is removed, allowing the two weldments to bond while still molten.

[0033] Temperature sensor 39 is mounted on sensor mounting block 38 and monitors the temperature of ceramic plate 33 in real time at a sampling frequency of 10Hz, feeding the data back to the welding machine control system. The control system dynamically adjusts the power of infrared heating element 32 based on a comparison between the preset temperature and the feedback value, achieving precise temperature control of ±0.1℃. When the temperature exceeds the set threshold (e.g., 480℃), temperature switch 37 cuts off the circuit within 0.5 seconds, stopping the infrared heating element 32 from heating and preventing overheating that could lead to plastic carbonization or equipment damage.

[0034] The aerogel insulation sleeve 36 between the second panel 35 and the fixed arm 2 effectively blocks heat transfer, reducing the temperature of the fixed arm 2 and protecting the welding machine's structural components while minimizing heat loss. The end of the wiring harness 4 furthest from the heating plate body 3 is connected to a pluggable terminal block 5, enabling quick connection between the heating plate body 3 and the welding machine's circuitry. This facilitates maintenance and replacement, and the contact resistance is ≤10mΩ, ensuring stable power transmission.

[0035] The 0.1mm thick nanocrystalline layer on the surface of ceramic plate 33 has extremely low surface energy, which significantly reduces the adhesion of molten plastic, reduces cleaning frequency, and improves production efficiency. The first panel 34 and the second panel 35 are connected by M4 stainless steel bolts, which also penetrate through both sets of ceramic plates 33 to lock the overall structure, facilitating the disassembly and replacement of internal components and shortening equipment maintenance time.

[0036] The above specific embodiments are merely optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A plastic welder heating plate comprising a welder body (1), a fixed arm (2) mounted on said welder body (1), characterized in that, It further includes: A heating plate body (3) installed on one side of the fixed arm (2). The heating plate body (3) includes a frame (31), an infrared heating sheet (32) is installed in the frame (31), and ceramic plates (33) are arranged on both sides of the infrared heating sheet (32); A wire harness (4) connected to the heating plate body (3). One end of the wire harness (4) away from the heating plate body (3) is connected to a pluggable terminal block (5).

2. The heating plate for a plastic welding machine according to claim 1, characterized in that, The heating plate body (3) further includes a first panel (34) arranged on the side of the frame (31) close to the wire harness (4). A second panel (35) is installed on the side of the frame (31) away from the first panel (34). The second panel (35) is arranged in a "U" shape, and the first panel (34) and the second panel (35) are connected by bolts.

3. A heating plate for a plastic welding machine according to claim 2, characterized in that, The fixed arm (2) is arranged on the side of the frame (31) away from the second panel (35). A plurality of heat insulation sleeves (36) are arranged between the second panel (35) and the fixed arm (2). Bolts slidably installed in the heat insulation sleeves (36) connect the second panel (35) and the fixed arm (2).

4. A heating plate for a plastic welding machine according to claim 3, characterized in that, The frame (31) is arranged in a "冂" shape, and a temperature switch (37) is installed inside the frame (31).

5. A heating plate for a plastic welding machine according to claim 4, characterized in that, A sensor fixing block (38) fixedly connected to the inside of the frame (31), and a temperature sensor (39) is installed on the sensor fixing block (38).

6. A heating plate for a plastic welding machine according to claim 5, characterized in that, The maximum temperature of the infrared heating sheet (32) is 450 °C.

7. A heating plate for a plastic welding machine according to claim 6, characterized in that, The ceramic plate (33) is made of boron nitride material, and an anti-sticking layer is arranged on the side of the ceramic plate (33) away from the infrared heating sheet (32).

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