A method for winding and sealing platinum wire of channel heater

Abstract

The present invention discloses a method for winding and sealing a platinum wire of a channel heater, and belongs to the technical field of substrate glass manufacturing. The method optimizes the life reliability of a platinum channel auxiliary heater, firstly cleans the heater, then lays and winds a slurry material with a particle size of 0.1-0.2 mm in different regions, then fills the upper part of the wire groove with mud, and compacts it with a multi-point compaction tool to complete the winding and sealing of the platinum wire of the channel heater. The method can overcome the problem that mud is difficult to enter the bottom of the groove in the traditional wire winding process, causing the platinum heating wire to volatilize unevenly toward one side of the heater wire groove, and realizes comprehensive and dense filling of the heater wire groove, effectively improving the reliability of the heater. The method can be applied to the manufacture and installation of platinum channel auxiliary heaters.

Description

Technical Field

[0001] The invention belongs to the technical field of substrate glass manufacturing, and in particular relates to a method for winding and sealing platinum wire of a channel heater. Background Art

[0002] The platinum channel is a process equipment for precise control of the glass liquid melted from the pool furnace at high temperature. It needs to maintain different process temperatures according to different functional areas. Since the high temperature area is mainly heated, direct heating is mostly used, while the rear area is mainly controlled to cool down, so a mild auxiliary heating method is mostly used. Among them, auxiliary heating is mainly to heat the internal glass liquid through heat conduction through a dedicated platinum heater, and the platinum heater mainly includes a heater brick and a platinum heating wire. The platinum heating wire is evenly wound in the pre-made heater wire slot, and the excess space in the slot is filled and sealed with fillers to ensure tight wrapping and protection of the heating wire. Since the platinum heating wire is supported by pure Pt, its general operating temperature is about 1400℃, and it is required to have long-term reliable operation capabilities, and the platinum heating wire needs to be loaded with direct current to continuously supply heat to the internal glass liquid through its own Joule heat. After analyzing multiple wires, it has been made clear that after the platinum heater has been running for a period of time, the air remaining in the filling gap inside it will produce a continuous oxidation process on the platinum wire. A certain microscopic gap can allow the oxide on the surface to volatilize further, and reach saturation and precipitate crystals within a certain period of time, decomposing oxygen again. The decomposed oxygen continues to oxidize the platinum wire, and this cycle continues. After a long time, crystals of different sizes and regular shapes will be formed on the surface of the heating wire or the surrounding filling material. This oxidation volatilization will cause the diameter of the platinum heating wire to slowly decrease, which in turn leads to an increase in the resistance of the heating wire, an increase in local self-heating, and further the risk of breakage, causing the heater circuit to fail.

[0003] Based on the above-mentioned research on oxidation volatilization, it was found that one of the main reasons for the volatilization of platinum heating wire is the poor filling and sealing of the heating wire. The current process has certain limitations, especially at the bottom of the groove, that is, the inner side of the heating wire. Since the gaps on both sides are very small, it is difficult for the filler to fully fill the inside, thus creating conditions for oxidation volatilization of the platinum heating wire. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for winding and sealing platinum wire of a channel heater, so as to solve the problem of poor sealing performance of the existing platinum heating wire winding.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The invention discloses a method for winding and sealing platinum wire of a channel heater, which comprises the following steps: firstly, cleaning the heater, then laying materials and winding wires in the heater wire groove in different areas, then filling the upper part of the wire groove with mud material, and compacting it with a multi-point compaction tool, so as to complete the winding and sealing of the platinum wire of the channel heater;

[0007] The paving material is a slurry, which is made of powder with a particle size of 0.1-0.2 mm and water in a weight ratio of 1:1.5; the wire winding is completed before the slurry solidifies.

[0008] Preferably, the powder is alumina.

[0009] Preferably, when the material laying and wire winding are carried out in different areas, the material laying and wire winding for each area are completed within 25 minutes.

[0010] Preferably, after the material is laid, a stainless steel sheet is slid in each heater wire slot before winding the wire;

[0011] The thickness of the stainless steel sheet is smaller than the height of the heater wire groove, and the bottom of the stainless steel sheet is an arc surface structure with the same radius as the platinum heating wire.

[0012] Preferably, the mud is made of powder with a particle size of 0.3-0.5 mm and water in a weight ratio of 1:1.

[0013] Preferably, the multi-point compaction tool comprises a gripping rod, the end of which is connected to a plurality of pressure rods, and the end of which is connected to a pressure ball; the method of using the multi-point compaction tool is as follows: align the pressure ball with each heater wire groove to perform a one-time precise compaction operation.

[0014] Further preferably, the multi-point compaction tool is made of stainless steel.

[0015] Preferably, the handle has a diameter of 10 mm, a wall thickness of 1.5 mm, and a length of 200-300 mm.

[0016] Preferably, the pressure rod is made of solid material with a diameter of 5 mm. The main body is curved, and its end forms an angle of 135°-160° with the grip rod. The spacing between each pressure rod is the same as the spacing between the heater wire slots. The number of pressure rods can be adjusted according to the requirements of a single press.

[0017] Preferably, the pressed ball is a standard spherical structure, and its diameter is 15%-25% greater than the diameter of the heater wire slot.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a winding and sealing method for platinum wire of a channel heater. Different from the traditional winding process, the mud material (powder with a particle size of 0.3-0.5 mm mixed with water) is evenly mixed and poured into the wound heater wire groove, and the worker repeatedly presses and rubs with the palm of a rubber glove to make the mud material enter the lower part of the platinum heating wire 2. The present method designs a new winding and filling process, and the whole heater is divided into areas for laying and winding, that is, laying a part and winding a part, which can ensure that the platinum heating wire is embedded in the unsolidified thin In the slurry, ensure the fit between the platinum heating wire and the slurry; by configuring a special slurry, pre-pad the inside of the heater wire slot, and then embed the platinum heating wire in it, which can effectively improve the all-round sealing of the platinum heating wire; after the heater wire slot is filled, the entire slot is locally compacted, which can overcome the problem that the mud material is difficult to enter the bottom of the slot in the traditional wire winding process, causing the platinum heating wire to volatilize unevenly on one side of the slot, and achieve comprehensive and dense filling of the heater wire slot, effectively improving the reliability of the heater. This method can be applied to the production and installation of platinum channel auxiliary heaters.

[0020] Furthermore, it takes about 2 hours to wind a heater. Experiments have shown that the alumina slurry will solidify in the heater brick after 30 minutes. Therefore, when laying the slurry, the filling and winding of an area can be completed within 25 minutes, which can ensure that the platinum heating wire is embedded in the soft slurry and fully sealed and wrapped.

[0021] Furthermore, a stainless steel sheet is used to slide in each heater wire slot and then the wire is wound, which can further ensure that the slurry in the heater wire slot is evenly distributed.

[0022] The present invention provides a multi-point compaction tool for a winding and sealing method of a platinum wire of a channel heater. In the compaction step, the multi-point compaction tool cooperates with the winding and sealing process to simultaneously perform precise compaction operations on multiple heater wire slots, with significant improvements in efficiency and effect. The filling and sealing properties of the platinum heating wire can be improved, and a more stringent seal can be achieved in the slot, thereby effectively improving reliability issues.

[0023] Furthermore, the pressure rod is made of solid material, which can ensure the structural strength of the multi-point compaction tool.

[0024] Furthermore, the pressing ball is a standard spherical structure, and its diameter is 15%-25% larger than the diameter of the heater wire groove, which can ensure that the arc surface of the pressing ball can act on the mud material in the heater wire groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the platinum heater of the present invention;

[0026] Figure 2 It is a schematic diagram of the operation method of filling in the compaction tank of the present invention;

[0027] Figure 3 It is a special multi-point compaction tool of the present invention;

[0028] Figure 4 It is a cross-sectional schematic diagram of the heating wire of the present invention in the slot;

[0029] Figure 5 It is a schematic diagram of the oxidation crystallization of the heating wire of the present invention in the groove.

[0030] Among them: 1-heater brick; 2-platinum heating wire; 3-multi-point compaction tool; 3-1-grip rod; 3-2-pressure rod; 3-3-pressure ball; 4-heater wire groove; 4-1-upper part of wire groove; 4-2-lower part of wire groove; 5-crystallized material. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "comprises" and "has" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0034] The present invention provides a method for winding and sealing a platinum wire of a channel heater, and the process is as follows:

[0035] 1. Clean the heater;

[0036] The specific steps are: scrub the heater brick 1 and the heater wire slot 4 with alcohol, and clean the remaining brick residue in the slot with a hair dryer;

[0037] 2. Divide the heater into several zones, and carry out material laying and wire winding for each zone in turn within 25 minutes;

[0038] like Figure 1 As shown in the figure, the specific steps for laying and winding wire in a certain area are:

[0039] (1) Before the formal winding, repeatedly pour the premixed slurry evenly into the heater wire slot 4, and shake the heater along the heater wire slot 4 to ensure that the slurry is evenly distributed in the slot;

[0040] The preparation method of the slurry is as follows: sieving the aluminum oxide slurry through a sieve to make the particle size reach 0.1-0.2 mm, and then mixing the sieved powder with water in a weight ratio of 1:1.5 to prepare the slurry;

[0041] (2) Stainless steel sheets are used to slide in each heater wire slot 4 to further ensure that the slurry in the slot is evenly distributed;

[0042] The thickness of the stainless steel sheet is smaller than the height of the heater wire slot 4, and the bottom of the stainless steel sheet is an arc surface structure with the same radius as the platinum heating wire 2;

[0043] (3) Winding the platinum heating wire 2;

[0044] like Figure 3 The platinum heating wire 2 (generally, a single heater wire slot 4 can be distributed with dozens of wires, and a single loop can use nearly ten meters of platinum heating wire) is evenly wound in the heater wire slot 4.

[0045] The above method of laying and winding wires in a certain area is adopted to sequentially complete the laying and winding of wires in all areas of the heater;

[0046] 3. Fill the upper part 4-1 of the wire groove with mud;

[0047] The mud material is made of powder with a particle size of 0.3-0.5 mm and water in a weight ratio of 1:1;

[0048] 4. Such as Figure 2 As shown, after the mud material is filled, the heater wire groove 4 is compacted with a special compaction tool 3 to complete the winding and sealing of the platinum wire of the channel heater;

[0049] The special compaction tool 3 is made of stainless steel and has a structure as follows: Figure 3As shown, it comprises a grip rod 3-1, the end of which is connected to a plurality of pressure rods 3-2, and the end of which is connected to a pressure ball 3-3; the grip rod 3-1 has a diameter of 10 mm, a wall thickness of 1.5 mm, and a length of 200-300 mm; the pressure rod 3-2 is made of solid material to ensure structural strength, the pressure rod 3-2 has a diameter of 5 mm, and the body is curved, and its end forms an angle of 135°-160° with the grip rod 3-1, and the spacing between each pressure rod 3-2 is the same as the spacing between the heater wire grooves 4, and the number of pressure rods 3-2 can be adjusted according to the single pressing requirement, and 4-8 are generally designed considering the operating force; the pressure ball 3-3 is a standard spherical structure, and its diameter is 15%-25% larger than the diameter of the heater wire groove 4, so as to ensure that the arc surface of the pressure ball 3-3 can act on the mud in the heater wire groove 4; as shown Figure 4 As shown, during use of the special compaction tool 3, the pressure ball 3-3 is aligned with each heater wire groove 4 to perform a one-time precise compaction operation. The pressure ball 3-3 with an arc surface can achieve more targeted compaction of the mud material in the heater wire groove 4.

[0050] The platinum wire winding and sealing method of the channel heater provided by the present invention is applied to two high-generation wire bodies for experiments. The platinum heater is composed of a heater brick 1 and a platinum heating wire 2. The platinum heating wire 2 is placed in a heater wire slot 4. The heater wire slot 4 is divided into an upper wire slot 4-1 and a lower wire slot 4-2. Figure 4 As shown, in the original process, the platinum heating wire 2 is located in the groove of the heater brick 1, and the platinum heating wire 2 is placed at the bottom of the groove. However, this situation is more likely to cause blind areas to be filled on both sides of the bottom platinum heating wire 2, such as Figure 5 As shown, there is often a problem of insufficient filling in the lower area 4-2 of the wire slot, which will cause the platinum heating wire 2 to continuously oxidize, volatilize and crystallize during high-temperature operation, and its crystals 5 will be distributed in the lower part of the platinum heating wire 2. After a long time, the diameter of the platinum heating wire 2 will be reduced, and further may cause the risk of breakage and failure; compared with the original process, the method provided by the present invention is used to analyze the resistance of the platinum heating wire. It is found that compared with the early wire of the original process, the heater resistance attenuation rate is reduced by nearly 50%, and the design life can reach 6 years, which can effectively ensure the reliable operation of the wire.

[0051] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for winding and sealing platinum wire of a channel heater, characterized in that: First, the heater is cleaned, and then the material is laid and the wire is wound in the heater wire groove (4) in different areas, and then the upper part (4-1) of the wire groove is filled with mud material and compacted with a multi-point compaction tool (3) to complete the winding and sealing of the platinum wire of the channel heater; The paving material is a slurry, which is made of powder with a particle size of 0.1-0.2 mm and water in a weight ratio of 1:1.5; the mud is made of powder with a particle size of 0.3-0.5 mm and water in a weight ratio of 1:1; the powder is alumina; the wire winding is completed before the slurry solidifies; the multi-point compaction tool (3) includes a gripping rod (3-1), the end of the gripping rod (3-1) is connected to a plurality of pressure rods (3-2), and the end of the pressure rod (3-2) is connected to a pressure ball (3-3); the method of using the multi-point compaction tool (3) is to align the pressure ball (3-3) with each heater wire slot (4) to perform a one-time precise compaction operation.

2. A method for winding and sealing a platinum wire of a channel heater as claimed in claim 1, characterized in that: When laying and winding the wire in different areas, the laying and winding of the wire in each area shall be completed within 25 minutes.

3. A method for winding and sealing platinum wire of a channel heater as claimed in claim 1, characterized in that: After the material is laid, a stainless steel sheet is slid in each heater wire slot (4) before winding the wire; The thickness of the stainless steel sheet is smaller than the height of the heater wire slot (4), and the bottom of the stainless steel sheet is an arc surface structure having the same radius as the platinum heating wire (2).

4. A method for winding and sealing platinum wire of a channel heater as claimed in claim 1, characterized in that: The multi-point compaction tool (3) is made of stainless steel.

5. A method for winding and sealing platinum wire of a channel heater as claimed in claim 1, characterized in that: The grip (3-1) has a diameter of 10 mm, a wall thickness of 1.5 mm and a length of 200-300 mm.

6. A method for winding and sealing platinum wire of a channel heater as claimed in claim 1, characterized in that: The pressure rod (3-2) is made of solid material and has a diameter of 5 mm. The main body is in a curved shape, and its end forms an angle of 135°-160° with the grip rod (3-1). The spacing between the pressure rods (3-2) is the same as the spacing between the heater wire slots (4), and the number of pressure rods (3-2) can be adjusted according to the needs of a single press.

7. A method for winding and sealing a platinum wire of a channel heater as claimed in claim 1, characterized in that: The pressure ball (3-3) is a standard spherical structure, and its diameter is 15%-25% greater than the diameter of the heater wire groove (4).

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