Heating element of continuous hot press molding device

Abstract

The utility model relates to a heating element of a continuous hot press molding device, which mainly comprises a resistor, the outer surface of the resistor is coated with an insulated airtight protective layer, and the two ends of the resistor are exposed out of the two ends of the protective layer and form wiring ends; the continuous hot press molding device is provided with an airtight cavity, an insulating layer is arranged at the position, corresponding to the penetrating position of the airtight cavity, of the resistor, and the resistor is connected with the airtight cavity through the insulating layer. The resistance body may be made of silicon carbide, the protective layer may be made of high-purity aluminum oxide or silicon carbide, and the insulating layer may be made of a ceramic insulating material. The contact part of the heating element and the airtight cavity of the continuous hot-press forming device is not affected by high-temperature oxidation, damage and the like, and the heating element is particularly suitable for the high-temperature airtight type continuous hot-press forming device.

Description

Technical Field

[0001] The utility model belongs to the technical field of heaters, in particular to a heating element suitable for an airtight continuous hot pressing molding device. Background Art

[0002] Nowadays, thermoforming is a processing method for polymer materials. It mainly involves placing a material of a certain thickness in a mold, heating the mold or the environment to soften the material and cover the mold surface, and then squeezing it with a machine. After the cooling stage and solidification, a thermoformed product can be obtained.

[0003] For example, glass is a material for hot pressing. Because glass has a high light transmittance, it is often used as the outer shell of the window part of display devices (such as mobile phones, watches and other electronic products). 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 in the shape of a flat plate, so a seam will be formed on the upper surface of the electronic product. Furthermore, since a certain width of the mechanism must be retained around the electronic product 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.

[0004] Flat glass shells are easier to manufacture, while glass shells with three-dimensional shapes are more difficult to manufacture. At present, there are usually two methods for manufacturing glass shells with three-dimensional shapes: the first is to manufacture multiple flat glass units, and then form a glass shell with a three-dimensional shape by gluing the edges. The second 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, both 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 a glass with a shape is to be produced, 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 above-mentioned glass material is softened, the upper mold and the lower mold can perform a mold closing action, so that the upper mold and the lower mold can jointly shape the shape of the glass material along a mold closing direction, thereby producing the corresponding molded glass.

[0005] The prior art discloses an "airtight molded three-dimensional glass continuous forming device", which is a new design of a continuous forming device designed for molded three-dimensional glass products. It is mainly composed of a furnace body, which is a closed type. An exchange system is provided at both ends of the furnace body, and an airtight cavity is provided inside the furnace body; the exchange system is provided at both ends of the furnace body, and an external conveying channel is provided between the exchange systems at both ends of the furnace body. Each exchange system includes an inner airtight door provided on the side of the furnace body and an outer airtight door provided on the side of the external conveying channel. An airtight space is formed 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 cavity is provided inside the furnace body, including an airtight cavity, and an inner conveying channel is provided in the airtight cavity. The inner conveying channel connects the inner airtight doors of the exchange system at both ends of the furnace body, and is provided with a slide rail to serve as a track for the movement of the carrier. The airtight cavity is airtight, and a protective gas is introduced, and according to the process The furnace body is divided into a heating zone, a high-temperature forming zone and a cooling zone. The heating zone and the high-temperature forming zone are provided with at least one insulating layer, and a heat field is formed in the center of the insulating layer. A heating element with a temperature required by the process procedure is provided in the hot field. The cooling zone has a cooling device, and 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; in the utility model thus constructed, the flat glass to be formed is placed on the forming surface of the mold, and the mold is placed on a carrier plate, which enters the airtight cavity through the exchange system, is preheated in the heating zone, and is subjected to the high temperature of the high-temperature forming zone to soften the glass in the mold, and is formed by the pressurization of the pressurizing system, and is then cooled in the cooling zone and sent out of the furnace body through the exchange system, and then demolded, which can achieve the effect of continuous, efficient and high-quality molding of three-dimensional glass.

[0006] Furthermore, for existing heating elements please refer to Figure 1As shown, it mainly includes an electric heating element A and a protective tube B (most of the protective tubes are generally made of quartz tubes) covering the outer edge of the electric heating element A. The aforementioned heating element A is exposed at the two open ends of the protective tube B and forms a terminal D. The two sides of the open ends of the protective tube B are fixed and sealed with fixing parts C to form a whole structure. This existing heater is widely used in the field of household appliances and machinery that requires heating. When the heater of this structure is used for heating in an airtight molded three-dimensional glass continuous forming device, since the two sides of the protective tube do not have an airtight structure, the gas in the atmosphere (such as nitrogen, hydrogen, argon, chlorine, etc., some of which are corrosive) will penetrate into the protective tube through the two sides of the protective tube, which will cause the heating element in the protective tube to be corroded and damaged, or the adverse reaction will affect its loss. 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, etc., has higher temperature requirements in the thermal field of the airtight cavity, and the existing heating element protection tube made of quartz cannot meet the high temperature requirements. In addition, the heating element set in the thermal field of the existing hot continuous hot pressing molding device is directly in contact with the hot field airtight cavity, which is easy to cause the contact part of the heating element and the airtight cavity to be oxidized and damaged due to high temperature. Utility Model Content

[0007] The present invention aims to provide a heating element suitable for a high-temperature airtight continuous hot pressing forming device.

[0008] The heating element of the continuous hot pressing forming device of the utility model mainly includes an impedance body, the outer surface of which is covered with 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 wiring terminals; the continuous hot pressing forming device has an airtight cavity, and the impedance body is provided with an insulating layer at a relative position where it passes through the airtight cavity, and is connected to the airtight cavity through the insulating layer.

[0009] The impedance body of the utility model is made of silicon carbide.

[0010] The protective layer of the utility model is composed of inorganic insulating materials, such as high-purity aluminum oxide or silicon carbide.

[0011] The above-mentioned insulating layer of the utility model is composed of ceramic insulating material.

[0012] The utility model not only protects the impedance body from corrosion or adverse reactions, but 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 adversely affected by high temperature oxidation, damage, etc., and is particularly suitable for high-temperature airtight continuous hot pressing molding devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a plan view of the existing heating element installation;

[0014] Figure 2 This is a front cross-sectional view of the airtight continuous hot pressing molding device of the utility model;

[0015] Figure 3 This is a cross-sectional view of the upper end of the airtight continuous hot pressing molding device of the utility model;

[0016] Figure 4 This is a cross-sectional view of the temperature rise zone of the airtight continuous hot pressing molding device of the utility model;

[0017] Figure 5 This is a cross-sectional view of the high-temperature forming area of ​​the airtight continuous hot pressing forming device of the utility model;

[0018] Figure 6 This is a cross-sectional view of a heating element according to an embodiment of the present utility model.

[0019] In the figure:

[0020] 1: furnace body; 2: exchange system; 20: inner airtight door; 21: outer airtight door; 22: airtight space; 23: displacement device; 3: airtight cavity; 30: airtight cavity; 300: air layer; 31: inner conveying channel; 32: heating zone; 33: high temperature forming zone; 34: cooling zone; 35: thermal insulation layer; 350: lower pressure plate; 351: reflecting plate; 36: thermal field; 38: cooling device; 39: slide rail; 4: outer conveying channel; 5: pressurizing system; 50: pressure cylinder; 51: pressurizing shaft; 52: pressurizing column; 53: cooling device; 6: carrier plate; 7: mold; 8: supporting device; 80: supporting column; 81: lifting device; 9: heating element; 90: impedance body; 91: protective layer; 92: terminal; 93: insulating layer. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0022] The utility model is a novel design of heating elements for airtight continuous atmosphere sintering molding devices for hot press molding products. The hot press molding materials of the utility model include but are not limited to glass, metal, ceramic or metal-ceramic heterogeneous composite materials. The airtight continuous hot press molding device used in the utility model can be found in Figure 2 , Figure 3 As shown, it mainly includes:

[0023] The furnace body 1 is a closed type, with an exchange system 2 provided at both ends of the exterior of the furnace body 1, and an airtight cavity 3 provided inside the furnace body 1;

[0024] The exchange system 2 is arranged at both ends of the furnace body 1. An external conveying channel 4 is arranged between the exchange systems 2 at both ends of the furnace body 1. Each exchange system 2 includes an inner airtight door 20 arranged at one side of the furnace body 1 and an outer airtight door 21 arranged at 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;

[0025] The airtight chamber 3 is arranged inside the furnace body 1, including an airtight chamber 30, and the airtight chamber 30 has an inner conveying channel 31, the inner conveying channel 31 connects the airtight doors 20 of the exchange system 2 at both ends of the furnace body 1, and is provided with a slide rail 39 (see Figure 4 and Figure 5 ), as a track 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, etc.; the device for providing the protective gas is a prior art, no further details are given), and is divided into a heating zone 32, a high-temperature molding zone 33 and a cooling zone 34 according to the process area, at least one thermal insulation layer 35 is provided in the heating zone 32 and the high-temperature molding zone 33, and a thermal field 36 is formed in the center of the thermal insulation layer 35, and a heating element 9 of a temperature required by the process procedure is provided in the thermal field 36 (temperature control devices and the like are prior art, no further details are given), the cooling zone 34 has a cooling device 38 (the cooling device (38) is a prior art, no further details are given), and the high-pressure molding zone 33 is provided with a pressurizing system 5;

[0026] An external conveying channel 4 connects the exchange system 2 at both ends of the furnace body 1;

[0027] Pressurized system 5, see Figure 4 As shown, the pressurizing system 5 is mainly composed of a pressurizing cylinder 50, a pressurizing shaft 51 and a pressurizing column 52;

[0028] In the utility model thus constructed, the object to be hot-pressed is placed on the molding surface of the mold 7, and the mold 7 is placed on the carrier 6. The carrier 6 enters the airtight chamber 3 through the exchange system 2, and is preheated in the temperature rising zone 32 (to avoid damage due to too rapid temperature changes) and the high temperature of the high-temperature molding zone 33, so that the object to be hot-pressed in the mold is softened, and is formed by the pressurization of the pressurization system 5, and then after being cooled in the cooling zone 34, it is sent to the outside of the furnace body 1 through the exchange system 2 and then demolded.

[0029] See also Figure 3As shown, the utility model is provided with an exchange system 2 on both sides of the furnace body 1, each exchange system 2 includes an inner airtight door 20 provided on one side of the furnace body 1 and an outer airtight door 21 provided on the side of the outer conveying channel 4, and 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, and after the airtight space 22 is evacuated and the protective gas is introduced to the same environment as that in the airtight cavity 3 (the vacuuming process will remove the air on the mold 7 ( In particular, oxygen and impurities are extracted together), the inner airtight door 20 on the furnace body side is opened to push the carrier plate 6 into the airtight chamber 3. Before the carrier plate 6 is to be 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 that in the airtight chamber 3. The inner airtight door 20 on the furnace body side is opened to push the carrier plate 6 into the airtight space 22. This has the effect of preventing the air outside the furnace from mixing into the airtight chamber 3, thereby improving the molding quality of the object to be hot-pressed.

[0030] See also Figure 6 As shown, the heating element 9 of the utility model 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 terminal 92. The impedance body 90 is provided with an insulating layer 93 at a position relative to the airtight cavity 30 of the continuous hot pressing molding device (see Figure 4 , Figure 5 ) The insulating layer 93 is connected to the airtight cavity 30. Since the protective layer 91 and the resistor 90 are insulated and airtight, the gas in the atmosphere cannot penetrate into the protective layer 91. This will not cause the resistor 90 in the protective layer 91 to be corroded or damaged, or be affected by any adverse reactions. Furthermore, since the resistor 90 is provided with an insulating layer 93 at a relative position relative to the airtight cavity 30 of the continuous hot pressing molding device, the insulating layer 93 is connected to the airtight cavity 30, that is, the heating element and the airtight cavity 30 are monitored by the insulating layer 93, rather than being directly in contact. This will not cause the contact part between the heating element 9 and the airtight cavity 30 to be oxidized or damaged due to high temperature, and is particularly suitable for high-temperature airtight continuous hot pressing molding devices.

[0031] The resistor 90 of the present invention is made of silicon carbide.

[0032] The protective layer 91 of the present invention is made of inorganic insulating materials, such as high-purity aluminum oxide or silicon carbide, so as to be suitable for high-temperature airtight continuous hot pressing molding devices.

[0033] The protective layer 91 of the present invention is coated on the outer edge of the resistor 90 in a coating manner.

[0034] The insulating layer 93 of the present invention is made of ceramic insulating material.

[0035] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. A heating element for a continuous hot pressing forming device, characterized in that: include: An impedance body, the outer surface of which is covered with an insulating and airtight protective layer, and the two ends of the impedance body are exposed at the two ends of the protective layer to form wiring terminals; The continuous hot pressing forming device has an airtight cavity. The impedance body is provided with an insulating layer at a position relative to the position where the airtight cavity is penetrated, and is connected to the airtight cavity through the insulating layer.

2. The heating element of the continuous hot pressing forming device according to claim 1, characterized in that: The resistor is made of silicon carbide.

3. The heating element of the continuous hot pressing forming device according to claim 1, characterized in that: The protective layer is composed of high-purity aluminum oxide.

4. The heating element of the continuous hot pressing forming device according to claim 1, characterized in that: The protective layer is composed of silicon carbide.

5. The heating element of the continuous hot pressing forming device according to claim 1, characterized in that: The insulating layer is made of ceramic insulating material.

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