TWM661876U - Heating element for continuous hot pressing molding device - Google Patents

Abstract

The invention relates to a heating element, which is particularly suitable for an airtight continuous hot pressing molding device. The heating element of the invention mainly includes an impedance body and a protective layer covering the outer edge of the impedance body to form an insulating and airtight protection layer. The two ends of the impedance body are exposed at the two ends of the protective layer and form a wiring terminal. The impedance body is provided with an insulating layer at a position opposite to the airtight cavity of the continuous hot pressing molding device. The insulating layer is connected to the airtight cavity. The impedance body is made of silicon carbide, the protective layer is made of high-purity aluminum oxide or silicon carbide, and the insulating layer is made of ceramic insulating material. In addition to protecting the impedance body from corrosion or adverse reactions, it also has the effect of preventing the contact part between the heating element and the airtight cavity of the continuous hot pressing molding device from being oxidized or damaged by high temperature. It is particularly suitable for high-temperature airtight continuous hot pressing molding devices.

Description

Heating element for continuous hot pressing molding device

This invention belongs to the field of heater technology, and is particularly suitable for airtight continuous hot pressing molding devices. In addition to protecting the resistor from corrosion or adverse reactions, it also has the effect of preventing the contact between the heating element and the airtight cavity of the continuous hot pressing molding device from being oxidized or damaged by high temperature. It is particularly suitable for high-temperature airtight continuous hot pressing molding devices.

Hot-press molding is a method of processing polymer materials. It mainly involves placing a material of a certain thickness in a mold, heating the mold or environment to soften the material and cover the mold surface, and then extruding it with a machine. After the material solidifies during the cooling stage, a hot-pressed product can be obtained.

For example, glass is a material for hot pressing. Because glass has a high light transmittance, display devices (such as mobile phones, watches and other electronic products) often choose it as the outer shell of the window part. You can see that the surface of handheld electronic products is usually equipped with a glass shell to protect the display module inside the product. Currently, most glass shells are flat in shape, so there will be seams on the upper surface of the electronic product. Furthermore, since the periphery of the electronic product must retain a certain width of the mechanism part to hold the flat glass, the top surface of the electronic product cannot be fully utilized. Therefore, three-dimensional or curved glass has gradually been used in the glass shell of electronic products.

Flat glass shells are easier to manufacture, while glass shells with three-dimensional shapes are more difficult to manufacture. Currently, there are usually two methods for manufacturing three-dimensional glass shells: the first method is to manufacture multiple flat glass units, and then form a three-dimensional glass shell by gluing the edges. The second method is to manufacture a rectangular glass of a certain thickness, and then grind the rectangular glass several times to form a three-dimensional shape with multiple sides. However, the above two methods are time-consuming and labor-intensive, and the production speed is very slow. Generally speaking, since the glass material is a flat plate, if you want to produce a glass with a shape, the better way is to place the flat glass material between an upper mold and a lower mold, and then heat the upper mold, the lower mold and the glass material to soften the glass material. When the glass material softens, the upper mold and the lower mold can be closed, so that the upper mold and the lower mold can jointly shape the shape of the glass material along a closing direction to produce the corresponding molded glass.

The applicant previously proposed and approved the M536234 "Airtight Molded Three-Dimensional Glass Continuous Forming Device", which is a new design for continuous molding devices designed for molded three-dimensional glass products. It mainly consists of a furnace body, which is a closed type, with exchange systems at both ends of the furnace body, and an airtight cavity inside the furnace body; the exchange systems are located at both ends of the furnace body, and an external conveying channel is provided between the exchange systems at the two ends of the furnace body. Each exchange system includes a furnace body. The inner airtight door on the side and the outer airtight door on the side of the outer conveying channel form an airtight space between the inner airtight door and the outer airtight door, and a displacement device is provided to push the carrier into or out of the furnace body; the airtight chamber is provided inside the furnace body, including an airtight chamber, and the airtight chamber has an inner conveying channel, the inner conveying channel connects the inner airtight door of the exchange system at both ends of the furnace body, and is provided with a slide rail as a rail for the movement of the carrier, the airtight chamber is airtight, and a protective gas is introduced , and divided into a heating zone), a high-temperature forming zone and a cooling zone according to the process. The heating zone and the high-temperature forming zone are provided with at least one heat-insulating layer, and a heat field is formed in the center of the heat-insulating layer. The heat field is provided with heating elements of a temperature required by the process procedure. The cooling zone has a cooling device. The high-pressure forming zone is provided with a pressurizing system; an external conveying channel connects the exchange system at both ends of the furnace body; the pressurizing system is mainly composed of a pressure cylinder, a pressurizing shaft and a pressurizing column; so constituted The original creation of this machine is that the flat glass to be formed is placed on the forming surface of the mold, and the mold is placed on the carrier. The carrier enters the airtight cavity through the exchange system, and is preheated in the temperature rising zone and heated in the high temperature forming zone to soften the glass in the mold. It is then pressurized by the pressurization system to form the glass. After cooling in the cooling zone, it is sent out of the furnace through the exchange system and then demolded. It can also achieve the effect of continuous, high-efficiency and high-quality molding of three-dimensional glass.

Furthermore, the commonly used heating element is shown in FIG1 , which mainly includes an electric heating element A and a protective tube B wrapped around the outer edge of the electric heating element A [the protective tube is generally made of a quartz tube]. The aforementioned heating element A is exposed at two open ends of the protective tube B and forms a wiring terminal D. The two sides of the open ends of the protective tube B are fixed and closed by fixing parts C to close the overall structure. This commonly used heater is widely used in home appliances and mechanical fields that require heating. However, when a heater of this structure is used for heating an airtight molded three-dimensional glass continuous forming device, since the two sides of the protection tube do not have an airtight structure, the gas in the atmosphere environment [such as nitrogen, hydrogen, argon, chlorine, etc., some of which are corrosive] will penetrate into the protection tube through the two sides of the protection tube, which will cause corrosion damage to the heating element in the protection tube, or adverse reactions will affect its failure. Furthermore, as the softening temperature of glass is getting higher and higher (especially the softening temperature of aluminum-containing glass is higher), in addition to glass, the hot pressing molding of hot pressing molding materials such as metal, ceramic or metal-ceramic heterogeneous composite materials requires higher temperature in the thermal field of the airtight cavity. The conventional heating element with a protective tube made of quartz cannot meet the high temperature requirements. In addition, the heating element installed in the thermal field of the conventional hot continuous hot pressing molding device is directly in contact with the thermal field airtight cavity, which can easily cause the contact part between the heating element and the airtight cavity to be oxidized and damaged due to high temperature. This is the biggest defect of the current conventional technology, and this defect has become a difficult problem that the industry needs to overcome urgently.

In view of the lack of practical technology, the creator of this case has accumulated his professional knowledge in the design and manufacturing of precision ceramic technology industrial products for many years. After continuous research and improvement, he finally successfully developed this creation and made it public.

Therefore, the main purpose of this invention is to provide a "heating element for continuous hot pressing molding device". The heating element of this invention mainly includes an impedance body and a protective layer covering the outer edge of the impedance body to form an insulating and airtight protective layer. The two ends of the impedance body are exposed at the two ends of the protective layer and form a wiring terminal. The impedance body is relatively airtight for the continuous hot pressing molding device. An insulating layer is provided at the relative position of the cavity penetration. The insulating layer is connected to the airtight cavity. In addition to protecting the resistor from corrosion or adverse reactions, it also has the effect of preventing the contact part between the heating element and the airtight cavity of the continuous hot pressing molding device from being oxidized or damaged by high temperature. It is particularly suitable for high-temperature airtight continuous hot pressing molding devices.

The aforementioned impedance body of this creation is made of silicon carbide.

The aforementioned protective layer of this creation is made of inorganic insulating materials, such as high-purity alumina or silicon carbide.

The aforementioned insulating layer of this creation is made of ceramic insulating material.

1: Furnace body

2: Exchange system

20: Inner airtight door

21: External airtight door

22: Airtight space

23: Displacement device

3: Airtight chamber

30: Airtight cavity

300: Air layer

31: Inner conveyor track

32: Warming up zone

33: High temperature molding area

34: Cooling zone

35: Thermal insulation layer

350: Lower pressure plate

351:Reflector

36: Warm up the crowd

38: Cooling device

39: Slide rail

4: External conveyor

5: Pressurization system

50: Cylinder

51: Pressure shaft

52: Pressure column

53: Cooling device

6: Carrier board

7: Mould

8: Support device

80: Support column

81: Lifting device

9: Heating element

90: Impedance body

91: Protective layer

92: Terminal

93: Insulation layer

[Figure 1] is a plan view of a conventional heating element device;

[Figure 2] is a front cross-sectional view of the airtight continuous hot pressing molding device of this invention;

[Figure 3] is a cross-sectional view of the upper end of the airtight continuous hot pressing molding device of this invention;

[Figure 4] is a cross-sectional diagram of the temperature rise zone of the airtight continuous hot pressing molding device of this invention;

[Figure 5] is a cross-sectional view of the high-temperature molding area of the airtight continuous hot-pressing molding device of this invention;

[Figure 6] is a cross-sectional view of the heating element of the present invention embodiment.

In order to achieve the technical means of the above-mentioned purpose of this creation, an implementation example is listed here, and the diagram is explained as follows. The review committee can gain a better understanding of the structure, characteristics and effects achieved by this creation.

This invention is a new design for the heating element of the airtight continuous atmosphere sintering molding device for hot-pressed products. The hot-pressed molding materials of this invention include but are not limited to glass, metal, ceramic or metal-ceramic heterogeneous composite materials. The airtight continuous hot-pressed molding device used in this invention is shown in Figures 2 and 3, which mainly includes:

The furnace body 1 is a closed type, with an exchange system 2 provided at both ends of the outside of the furnace body 1, and an airtight chamber 3 provided inside the furnace body 1;

The exchange system 2 is arranged at the two ends of the furnace body 1. An external conveying channel 4 is arranged between the exchange systems 2 at the two ends of the furnace body 1. Each exchange system 2 includes an inner airtight door 20 arranged on the side of the furnace body 1 and an outer airtight door 21 arranged on the side of the external conveying channel 4. An airtight space 22 is formed between the inner airtight door 20 and the outer airtight door 21, and a displacement device 23 is provided to push the carrier plate 6 into or out of the furnace body 1;

The airtight chamber 3 is disposed inside the furnace body 1 and includes an airtight chamber 30. The airtight chamber 30 has an inner conveying channel 31. The inner conveying channel 31 connects the airtight door 20 of the exchange system 2 at both ends of the furnace body 1 and is provided with a slide rail 39 [see FIG. 4 and FIG. 5] as a rail for the carrier 6 to move. The airtight chamber 3 is airtight and a protective gas [generally an inert gas, such as nitrogen, hydrogen, argon] is introduced into the airtight chamber 3. etc.; the device for providing protective gas is a commonly used technology and will not be elaborated on.], and according to the process, there are a temperature rising zone 32, a high temperature forming zone 33 and a cooling zone 34. The temperature rising zone 32 and the high temperature forming zone 33 are provided with at least one heat-insulating layer 35, and a heat field 36 is formed in the center of the heat-insulating layer 35. The heat field 36 is provided with a heating element 9 of a temperature required by the process procedure. [The temperature control device is a commonly used technology and will not be elaborated on.] The cooling zone 34 has a cooling device 38 [the cooling device (38) is a commonly used technology and will not be elaborated on], the high temperature forming zone 33 is provided with a pressurizing system 5; an external conveying channel 4, connecting the two ends of the furnace body 1 to the exchange system 2; the pressurizing system 5, please refer to FIG. 4, the pressurizing system 5 is mainly composed of a pressure cylinder 50, a pressurizing shaft 51 and a pressurizing column 52; the present invention thus constituted, when the hot press forming object is Placed on the molding surface of mold 7, mold 7 is placed on carrier 6, carrier 6 enters airtight chamber 3 through exchange system 2, preheated in temperature rising zone 32 [to avoid damage caused by too fast temperature change], and high temperature in high temperature molding zone 33, softens the hot-pressed molding in the mold, and is molded by pressurization of pressurization system 5, and then cooled in cooling zone 34, sent out of furnace body 1 through exchange system 2, and then demolded.

Please refer to FIG. 3 . The invention has an exchange system 2 disposed on both sides of the furnace body 1. Each exchange system 2 includes an inner airtight door 20 disposed on one side of the furnace body 1 and an outer airtight door 21 disposed on the side of the outer conveying channel 4. An airtight space 22 is formed between the inner airtight door 20 and the outer airtight door 21. Before the carrier plate 6 is fed into the furnace body 1, the inner airtight door 20 and the outer airtight door 21 at the head end of the furnace body 1 are closed. After the airtight space 22 is evacuated and the protective gas is introduced to the same environment as that in the airtight chamber 3, the air on the mold 7 is removed during the evacuation process. (especially oxygen) and impurities are extracted together], the airtight door 20 on the side of the furnace body is opened to push the carrier 6 into the airtight chamber 3. Before the carrier 6 is sent out of the airtight chamber 3, the inner airtight door 20 and the outer airtight door 21 at the rear end of the furnace body are closed, and the airtight space 22 has been evacuated and the protective gas is introduced to the same environment as the airtight chamber 3. The airtight door 20 on the side of the furnace body is opened to push the carrier 6 into the airtight space 22. This has the effect of preventing the airtight chamber 3 from mixing with the air outside the furnace, thereby improving the molding quality of the hot-pressed molding object.

Please refer to FIG. 6 . The heating element 9 of the invention mainly includes an impedance body 90 and a protective layer 91 covering the outer edge of the impedance body 90 to form an insulating and airtight protection layer. The two ends of the impedance body 90 are exposed at the two ends of the protective layer 91 and form a wiring terminal 92. The impedance body 90 is arranged at a position relative to the airtight cavity 30 of the continuous hot pressing molding device. There is an insulating layer 93 [see FIG. 4 and FIG. 5 ], which is connected to the airtight cavity 30. Since the protective layer 91 and the resistor 90 are insulated and airtightly combined, the gas in the atmospheric environment cannot penetrate into the protective layer 91, so that the resistor 90 in the protective layer 91 will not be corroded or damaged, or affected by any adverse reactions. Furthermore, since the impedance body 90 is provided with an insulating layer 93 at a position opposite to the airtight cavity 30 of the continuous hot pressing molding device, the insulation layer 93 is connected to the airtight cavity 30, that is, the heating element and the airtight cavity 30 are provided with an insulating layer 93, rather than being directly in contact with each other, so that the contact part between the heating element 9 and the airtight cavity 30 will not be oxidized or damaged due to high temperature, and is particularly suitable for high-temperature airtight continuous hot pressing molding devices.

The aforementioned resistor 90 of this invention is made of silicon carbide.

The aforementioned protective layer 91 of this invention is made of inorganic insulating materials, such as high-purity alumina or silicon carbide, so as to be suitable for high-temperature airtight continuous hot pressing molding equipment.

The aforementioned protective layer 91 of this invention is coated on the outer edge of the impedance body 90 by coating.

The aforementioned insulating layer 93 of this creation is made of ceramic insulating material.

In summary, the "heating element of continuous hot-pressing molding device" disclosed in this invention is unprecedented and has never been seen in domestic or foreign publications. It has the patent requirements of novelty. In addition, this invention can indeed eliminate the deficiencies of conventional technology and achieve the design purpose, which has fully met the patent requirements. Therefore, I have filed an application in accordance with the law. I sincerely request the review committee to review it and grant the patent to this case. I am really grateful.

However, the above is only a preferred feasible embodiment of this creation, and is not intended to limit the scope of this creation. For example, any equivalent structural changes made by those familiar with this technology using the description of this creation and the scope of the patent application should be included in the patent scope of this creation.

9: Heating element

90: Impedance body

91: Protective layer

92: Terminal

93: Insulation layer

Claims (5)

A heating element of a continuous hot-pressing molding device mainly includes an impedance body and a protective layer covering the outer edge of the impedance body to form an insulating and airtight protection layer. The two ends of the impedance body are exposed at the two ends of the protective layer and form a wiring terminal. The impedance body is provided with an insulating layer at a position opposite to the airtight cavity of the continuous hot-pressing molding device, and is connected to the airtight cavity through the insulating layer. A heating element for a continuous hot pressing molding device as described in Item 1 of the patent application, wherein the impedance body is made of silicon carbide. A heating element for a continuous hot pressing molding device as described in Item 1 of the patent application, wherein the protective layer is composed of high-purity aluminum oxide. A heating element for a continuous hot pressing molding device as described in Item 1 of the patent application, wherein the protective layer is composed of silicon carbide. A heating element for a continuous hot pressing molding device as described in Item 1 of the patent application, wherein the insulating layer is made of a ceramic insulating material.

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