Heating wire forming process

Abstract

The invention discloses a heating wire forming process. The heating wire forming process comprises the following steps that S1, a filling body raw material is extruded and formed into a first filling part from a powder shape; s2, the filling body raw material is extruded from powder to form a second filling part; s3, the first filling part and the second filling part are each provided with a heating wire body, and the heating wire bodies are at least partially clamped into the first filling part or the second filling part; s4, the first filling part and the second filling part are put into the mold body, a gap cavity is formed between the first filling part and the second filling part, and a plate body is arranged in the gap cavity; s5, filling body raw materials are put into the gap cavity, and the plate body and the first filling part are close to each other; s6, the plate body and the second filling part are close to each other; s7, the plate body leaves the gap cavity; and S8, filling body raw materials are supplemented into the gap cavity again, and the filling body is compacted up and down. The heating wire forming process is beneficial to improving the heating uniformity of the heating wire.

Description

Technical Field

[0001] This invention relates to the field of heating wire technology, and more specifically, to a heating wire forming process. Background Technology

[0002] Armored heating wires are widely used in petrochemical, metallurgical, and precision instrument industries due to their excellent insulation, high thermal conductivity, and compact structure. The traditional forming process typically involves placing the spiral portion of the heating wire directly into a metal sheath, filling the sheath with insulating materials such as magnesium oxide powder, and then compacting the sheath and internal components using a cold-drawing process.

[0003] The spiral section of the heating wire is prone to radial displacement during powder filling, resulting in uneven distribution of the heating wire and poor heat uniformity in the final product. In severe cases, localized overheating may occur, affecting the service life of the heating element. Furthermore, because the powder is added axially along the spiral section of the heating wire, it is difficult for the powder to fully enter the gaps in the spiral section, leading to insufficient compaction of the filler material. This not only reduces insulation performance but also affects heat conduction efficiency. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a heating wire forming process that is beneficial to improving the uniformity of heating of the heating wire.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a heating wire forming process, comprising the following steps: Step S1: extruding the filler material from powder to form a first filler part; Step S2: extruding the filler material from powder to form a second filler part; Step S3: installing the heating wire body on the first filler part and the second filler part respectively, with the heating wire body at least partially inserted into the first filler part or the second filler part; Step S4: placing the first filler part and the second filler part into a mold body, forming a gap cavity between the first filler part and the second filler part, and placing a plate in the gap cavity; Step S5: placing the filler material into the gap cavity, with the plate and the first filler part approaching each other so that the heating wire body installed on the first filler part is wrapped and compacted by the filler material; Step S6: placing the plate and the second filler part approaching each other so that the heating wire body installed on the second filler part is wrapped and compacted by the filler material; Step S7: removing the plate from the gap cavity; Step S8: replenishing the gap cavity with filler material again, and compacting the filler from top to bottom.

[0006] Furthermore, in step S3, the length direction of the heating wire body is the same as the length direction of the corresponding first filling portion or second filling portion. The heating wire bodies are arranged in pairs, and there is at least one pair.

[0007] Furthermore, in step S4, the first filling part and the second filling part are arranged opposite each other. The first filling part is provided with a groove for inserting the heating wire body. The opening of the groove faces the second filling part. The second filling part is provided with two grooves, both of which are used to insert the heating wire body. One groove is located on both sides of the other groove, and the openings of both grooves face the first filling part.

[0008] Furthermore, the heating wire body includes a spiral section that fits into a corresponding groove, and the spiral section has a spiral wire structure. The cross-section of the groove on the first filling section and the cross-section of the two grooves on the second filling section are both semi-circular.

[0009] Furthermore, the plate can move up and down to insert into the mold body upwards or extend downwards.

[0010] Furthermore, a movable seat is fixedly installed on the outer wall of the mold body, and the movable seat is slidably connected to a base. The movable seat can move back and forth along the inner wall of the base. The movable seat includes two components that are detachably connected. The two components clamp the mold body, and one of the components is driven by a linear drive component to achieve back and forth movement.

[0011] Furthermore, the bottom surface of the mold body is fitted with the inner bottom surface of the movable seat. In step S8, a pressure seat is used to compact the filler. The pressure seat is located above the mold body and is inserted into the upper end of the mold body to compact the filler.

[0012] In summary, the present invention has the following beneficial effects:

[0013] By compacting the filler material at both the front and back of the plate to wrap the heating wire body, the filler material (powder) is squeezed radially inward along the spiral section, which facilitates filling and compaction of the spiral section and reduces positional displacement of the spiral section. Furthermore, the preliminary forming of the first and second filler sections helps stabilize the distribution position of the spiral section, reducing the displacement of the spiral section during compaction and improving the uniformity of the distribution of the four spiral sections, thereby enhancing the uniformity of heating. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the plate insertion mold in the embodiment;

[0015] Figure 2 This is a cross-sectional view of the first filling portion in the embodiment;

[0016] Figure 3 This is a cross-sectional view of the second filling portion in the embodiment;

[0017] Figure 4 This is a schematic diagram of the structure of the heating wire body in the embodiment;

[0018] Figure 5This is a cross-sectional view of the final molded structure of the filler in the embodiment;

[0019] Figure 6 This is a specific installation diagram of the module in the embodiment;

[0020] Figure 7 for Figure 6 A partial view in the middle;

[0021] Figure 8 for Figure 6 View of the intermediate pressure seat in the P direction;

[0022] Figure 9 for Figure 6 Cross-sectional view along the MM direction;

[0023] Figure 10 This is a position diagram of the movable seat in the embodiment. Figure 1 ;

[0024] Figure 11 This is a position diagram of the movable seat in the embodiment. Figure 2 .

[0025] Reference numerals: mold body 1, gap cavity 11, moving seat 2, first component 21, second component 22, base 3, baffle 31, pressure seat 5, countersunk hole 51, groove 52, heating wire body 6, spiral part 61, straight part 62, linear drive component 7, plate 8, first plate part 81, second plate part 82, filler 9, first filling part 91, first groove 911, second filling part 92, second groove 921, third groove 922. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1 to 11 As shown, this embodiment discloses a heating wire forming process, including the following steps:

[0028] Step S1: The filler 9 raw material is extruded from powder to form the first filler part 91.

[0029] The filler 9 is made of magnesium oxide powder, such as... Figure 2The cross-sectional shape of the first filling part 91 is shown. The first filling part 91 is elongated and has a first groove 911 along its length. The first groove 911 is located on one side of the flat wall surface of the first filling part 91 and is used to hold the heating wire body 6 in place. Figure 4 The diagram shows the structure of the heating wire body 6. The heating wire body 6 is elongated and includes a spiral portion 61 and straight portions 62 located at both ends of the spiral portion 61. The spiral portion 61 is a spiral wire structure and serves as the heating area of ​​the heating wire body 6. The straight portions 62 are leads for connecting to external circuits. The cross-section of the first groove 911 is semi-circular. The radius of the spiral portion 61 is slightly larger than the radius of the first groove 911. The spiral portion 61 is slightly deformed and then inserted into the first groove 911 to form a temporary fixation.

[0030] Step S2: The filler 9 raw material is extruded from powder to form the second filler part 92.

[0031] The second filling part 92 is elongated, such as... Figure 3 The cross-sectional shape of the second filling part 92 is shown. The second filling part 92 has a second groove 921 and a third groove 922 along its length. The second groove 921 is located on both sides of the third groove 922. Both the second groove 921 and the third groove 922 are arranged along the length of the second filling part 92. The cross-section of the second filling part 92 is semi-circular. Both the second groove 921 and the third groove 922 extend recessed along the arc-shaped wall surface of the second filling part 92. The recess depth of the third groove 922 is greater than the recess depth of the second groove 921.

[0032] The second groove 921 and the third groove 922 are both used to insert the heating wire body 6. The insertion method is similar to that of inserting the first groove 911. After insertion, they both form a temporary fixation of the heating wire body 6.

[0033] Step S3: Heating wire bodies 6 are respectively installed in the first filling part 91 and the second filling part 92. The heating wire bodies 6 are at least partially engaged in the first filling part 91 or the second filling part 92. Specifically, the heating wire bodies 6 are arranged in pairs, and there is at least one pair. The heating wire bodies 6 are thermocouples. In this embodiment, there are two pairs of heating wire bodies 6. The first filling part 91 is equipped with one heating wire body 6, which is engaged in the first groove 911 to a depth of half the diameter of the heating wire body 6. The second filling part 92 is equipped with three heating wire bodies 6, which are engaged in two second grooves 921 and one third groove 922, respectively.

[0034] Step S4: As Figure 1 , Figure 6 As shown, the first filling part 91 and the second filling part 92 are placed into the mold body 1, which is a cylindrical structure. Figure 9As shown, a movable seat 2 is fixedly installed on the outer wall of the mold body 1, and a base 3 is slidably connected to the movable seat 2. The bottom surface of the mold body 1 is in contact with the inner bottom surface of the movable seat 2. The base 3 includes baffles 31 located on both sides, and the movable seat 2 can move back and forth along the inner wall of the baffles 31.

[0035] like Figure 9 As shown, the movable base 2 includes a first component 21 and a second component 22, which are detachably connected. The first component 21 and the second component 22 clamp the mold body 1. The first component 21 is driven by the linear drive component 7 to move back and forth. The second component 22 can be disassembled to remove the mold body 1. After removal, the mold body 1 can be demolded to remove the formed heating wire body 6 and the filler 9.

[0036] like Figure 1 As shown, the first filling part 91 and the second filling part 92 are inserted into the mold body 1, and a gap cavity 11 is formed between the first filling part 91 and the second filling part 92. The first filling part 91 and the second filling part 92 are arranged opposite each other. The opening of the first groove 911 faces the second filling part 92, and the openings of the second groove 921 and the third groove 922 both face the first filling part 91. A plate 8 is provided inside the gap cavity 11, combined with... Figure 1 , Figure 6 The bottom of the plate 8 is driven by a drive device to move up and down to insert into or extend out of the mold body 1. The drive device is a cylinder or a moving module. When the plate 8 is inserted into the mold body 1, the first filling part 91 and the second filling part 92 are inserted into the mold body 1, and the plate 8 is located between the first filling part 91 and the second filling part 92.

[0037] Step S5: The filler material 9 is placed into the gap cavity 11, and the plate 8 and the first filling part 91 are brought close together so that the heating wire body 6 installed in the first filling part 91 is wrapped and compacted by the filler material 9. Specifically, as follows... Figure 6 , Figure 8 As shown, the pressure base 5 has a countersunk hole 51 and a groove 52. The shape of the countersunk hole 51 is the same as that of the plate 8. The upper end of the plate 8 is inserted into the countersunk hole 51 so that both ends of the plate 8 are fixed. Figure 1 As shown, the plate body 8 includes a first plate portion 81 and a second plate portion 82. The second plate portion 82 is located on the left and right sides of the first plate portion 81. The front and rear sides of the first plate portion 81 are respectively opposite to the spiral portion 61 located in the first groove 911 and the spiral portion 61 located in the third groove 922. The second plate portion 82 is opposite to the spiral portion 61 in the second groove 921.

[0038] like Figure 10As shown, by driving the moving seat 2 to move, the mold body 1 moves synchronously, so that the plate body 8 and the first filling part 91 are brought closer to each other, so that the heating wire body 6 installed in the first filling part 91 is wrapped and compacted by the filling material 9.

[0039] Step S6: As Figure 11 As shown, the drive moving seat 2 moves in the opposite direction, and the plate 8 and the second filling part 92 move closer to each other so that the heating wire body 6 installed in the second filling part 92 is wrapped and compacted by the filling material 9.

[0040] like Figure 4 As shown, the heating wire body 6 is wrapped by compacting the filler 9 at the front and back of the plate 8, so that the filler material (powder) is squeezed inward along the radial direction of the spiral part 61, which is beneficial for filling and compacting the interior of the spiral part 61, while reducing the positional displacement of the spiral part 61. At the same time, due to the preliminary forming of the first filler part 91 and the second filler part 92, it is more conducive to stabilizing the distribution position of the spiral part 61, reducing the displacement of the spiral part 61 during the compaction process, thereby improving the uniformity of the distribution of the four spiral parts 61 and thus improving the uniformity of heating. The first filler part 91 and the second filler part 92 temporarily fix the heating wire body 6, so that it is not necessary to fix the two ends of the heating wire body 6 during installation, reducing the pressure on the straight part 62 and reducing the scrap rate.

[0041] Step S7: Plate 8 moves downward away from the gap cavity 11 and moves to the bottom of mold body 1.

[0042] Step S8: Fill the gap cavity 11 with filler material 9 again, and compact filler material 9 from top to bottom. Specifically, as follows: Figure 6 As shown, the filler 9 is compacted using a pressure seat 5, which is located above the mold body 1. The top of the pressure seat 5 is driven by a cylinder to move up and down. The pressure seat 5 is inserted into the upper end of the mold body 1 to compact the filler 9, thereby forming... Figure 5 The distribution of the filler 9 and the heating wire body 6 is shown.

[0043] The heating wire body 6 and the filler 9 are inserted into the sheath, and the sheath is formed into the final form of the electric heating strip after multiple cold drawing processes.

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A heating wire forming process, characterized in that, Includes the following steps: Step S1: The filler (9) raw material is extruded from powder to form the first filler part (91); Step S2: The filler (9) raw material is extruded from powder to form the second filler (92); Step S3: The heating wire body (6) is installed on the first filling part (91) and the second filling part (92) respectively, and the heating wire body (6) is at least partially inserted into the first filling part (91) or the second filling part (92); Step S4: Place the first filling part (91) and the second filling part (92) into the mold body (1), and form a gap cavity (11) between the first filling part (91) and the second filling part (92), and provide a plate body (8) in the gap cavity (11); Step S5: The filler (9) material is placed in the gap cavity (11), and the plate (8) and the first filling part (91) are brought close to each other so that the heating wire body (6) installed in the first filling part (91) is wrapped and compacted by the filler (9) material; Step S6: The plate (8) and the second filling part (92) move closer to each other so that the heating wire body (6) installed in the second filling part (92) is wrapped and compacted by the filling material (9); Step S7: The plate (8) leaves the gap cavity (11); Step S8: The filler material (9) is added back into the gap cavity (11), and the filler material (9) is compacted from top to bottom.

2. The heating wire forming process according to claim 1, characterized in that, In step S3, the length direction of the heating wire body (6) is the same as the length direction of the corresponding first filling part (91) or second filling part (92).

3. The heating wire forming process according to claim 1, characterized in that, The heating wire bodies (6) are arranged in pairs, with at least one pair.

4. The heating wire forming process according to claim 1, characterized in that, In step S4, the first filling part (91) and the second filling part (92) are arranged opposite each other. The first filling part (91) is provided with a first groove (911) for inserting the heating wire body (6). The opening of the first groove (911) faces the second filling part (92). The second filling part (92) is provided with a second groove (921) and a third groove (922). Both the second groove (921) and the third groove (922) are used to insert the heating wire body (6). The second groove (921) is located on both sides of the third groove (922). The openings of the second groove (921) and the third groove (922) face the first filling part (91).

5. The heating wire forming process according to claim 4, characterized in that, The heating wire body (6) includes a spiral part (61), which is engaged in the corresponding first groove (911), second groove (921), or third groove (922). The spiral part (61) is a spiral wire structure.

6. The heating wire forming process according to claim 4, characterized in that, The cross-sections of the first groove (911) and the second groove (921) are both semi-circular.

7. The heating wire forming process according to claim 1, characterized in that, The plate (8) can move up and down to insert into the mold body (1) upward or extend downward.

8. The heating wire forming process according to claim 1, characterized in that, A movable seat (2) is fixedly installed on the outer wall of the mold body (1). The movable seat (2) is slidably connected to a base (3). The movable seat (2) can move back and forth along the inner wall of the base (3).

9. The heating wire forming process according to claim 8, characterized in that, The movable seat (2) includes a first component (21) and a second component (22). The first component (21) and the second component (22) are detachably connected. The first component (21) and the second component (22) clamp the mold body (1). The first component (21) is driven by a linear drive component (7) to achieve forward and backward movement.

10. A heating wire forming process according to claim 8, characterized in that, The bottom surface of the mold body (1) is in contact with the inner bottom surface of the movable seat (2). In step S8, the filling material (9) is compacted using a pressure seat (5). The pressure seat (5) is located above the mold body (1). The pressure seat (5) is inserted into the upper end of the mold body (1) to compact the filling material (9).

Images