Flexible ceramic heating sheet suitable for special-shaped pipe fitting joint and use method thereof

Abstract

The invention discloses a flexible ceramic heating piece suitable for a special-shaped pipe fitting connector and a using method of the flexible ceramic heating piece, and belongs to the technical field of steel welding heat treatment. Comprising a plurality of flexible ceramic heating sheets in regular hexagonal prism structures, three parallel side surfaces of each flexible ceramic heating sheet are respectively provided with two through holes for placing heating wires, and the two through holes are parallel to each other. And the six through holes intersect in the flexible ceramic heating sheet. By means of the structure, depending on the special structural form of the heating piece and combining different threading weaving methods, the heating piece can be suitable for heat treatment of welding seams of various special-shaped pipe fitting joints, and especially has a good heat treatment effect on spherical and hemispherical end sockets and end covers which cannot be wrapped by traditional heating pieces.

Description

Technical Field

[0001] The invention relates to the technical field of steel welding heat treatment, and in particular to a flexible ceramic heating sheet suitable for special-shaped pipe joints and a use method thereof. Background Art

[0002] In the field of pipeline welding, during the welding process, the weldment is locally heated to a very high temperature and then cooled rapidly. This uneven heating and cooling can cause thermal stress inside the weldment. Welding heat treatment can effectively reduce or eliminate these residual stresses, improve the performance and quality of the weldment, and thus improve the strength and toughness of the material. For some alloy steels, tempering treatment can adjust the hardness of the welded joint, improve the toughness and plasticity of the material, and optimize its comprehensive performance.

[0003] For welding at the construction site, due to the complex on-site environment, flexible ceramic heating plates are often used for welding heat treatment. The working principle is that the thermal resistance wire in the heating plate is energized and heated, and the heating plate uses heat conduction to keep the weld and the heat-affected zone at a higher temperature. This method is easy to construct and has strong adaptability. The specifications can be adjusted according to the diameter of the welding pipe.

[0004] However, traditional ceramic heating plates are rectangular sheet structures or cylindrical structures with 1-2 through holes in the length direction of the heating plates. The two types of heating plates are woven into a blanket structure or a rope structure using thermal resistance wire. The blanket structure has poor wrapping ability for special-shaped pipe fittings, and the rope structure has poor wrapping ability for spherical pipe fittings. Both structures have limitations and are basically only suitable for heat treatment of pipe butt welds.

[0005] The invention patent with the publication number CN107014206B discloses a forming method of a ceramic mesh inlaid furnace tube, wherein a ceramic clay embryo is applied inside a metal furnace tube, and the ceramic clay embryo is attached to the inner wall of the metal furnace tube with the support of a metal mesh structure, and is formed into a ceramic inner tube after being fired into porcelain; the metal mesh inlaid on the inner wall of the metal furnace tube is a tortoise shell mesh structure, and the tortoise shell mesh furnace tube can be applied on the inner wall to hang the ceramic clay embryo, and the ceramic inner tube can be fixed after the ceramic clay embryo is fired into porcelain. However, this structure can only be adapted to large-scale integral equipment with cavities for high-temperature kiln firing, and cannot be adjusted after the specifications are fixed. It can only be used for the heated parts to be placed in the cavity as a whole, and is not flexible. It is not suitable for special working conditions such as narrow space, high altitude, and adjacent to the parts to be heated and not heated. Moreover, the regular hexagonal metal mesh contained in it acts as a ceramic clay embryo skeleton to bear and shape the ceramic clay embryo skeleton. The finished equipment does not have a regular hexagonal structure, which is meaningless for the equipment to realize the heating function.

[0006] Therefore, it is necessary to provide a ceramic heating suitable for special-shaped pipe structures and suitable for welding pipes of different configurations. Summary of the invention

[0007] The purpose of the present invention is to provide a flexible ceramic heating sheet suitable for special-shaped pipe joints and a method of using the same. Relying on the unique structural form of the heating sheet and combined with different threading and weaving methods, the heating sheet can be used for heat treatment of welds of various special-shaped pipe joints, especially for spherical and hemispherical heads and end covers that cannot be wrapped by traditional heating sheets, and can achieve good heat treatment effects.

[0008] To achieve the above objectives, the present invention provides a flexible ceramic heating plate suitable for special-shaped pipe joints, including a plurality of flexible ceramic heating plates in a regular hexagonal prism configuration, wherein the three parallel side surfaces of the flexible ceramic heating plate are each provided with two through holes for placing heating wires, and the two through holes are parallel to each other.

[0009] Preferably, the six through holes intersect inside the flexible ceramic heating plate.

[0010] Preferably, the ratio of the height of the flexible ceramic heating plate to the diameter of the hexagonal circumscribed circle is 1:3, the ratio of the diameter of the through hole to the side length of the hexagon is 3:10, and the ratio of the center distance of two through holes on the same side to the side length of the hexagon is 2:15.

[0011] Preferably, the diameter of the hexagonal inscribed circle of the flexible ceramic heating plate is 30 mm, the height is 10 mm, the diameter of the through hole is 4.5 mm, and the distance between the centers of the two through holes on the same side is 6.5.

[0012] Preferably, the heating wire is a nickel-chromium alloy heating wire, and the flexible ceramic heating plate is made of high-purity alumina ceramic.

[0013] The present invention also discloses a method for using the above-mentioned flexible ceramic heating sheet suitable for special-shaped pipe fitting joints. The flexible ceramic heating sheet is applied to the heat treatment of the weld of the special-shaped pipe fitting joint, comprising the following steps:

[0014] (1) Loft out a plane geometric figure according to the part (area) to be heated.

[0015] (2) The plane geometric figure in (1) is enlarged according to the thickness of the flexible ceramic heating sheet, so that the enlarged figure with a certain thickness can completely wrap the component (part) to be heated.

[0016] (3) Align the side surfaces of several flexible ceramic heating plates to form a planar geometric figure (2), insert the heating wire into the first heating plate hole at any end of the edge of the planar geometric figure (2), and connect all the heating plates in series using a Z-shaped insertion method so that the heating wires are evenly arranged in the planar geometric figure (2).

[0017] (4) Each ceramic heating plate is connected in series with at least two adjacent ceramic heating plates, and each ceramic heating plate forms an interconnected whole to form a complete heating plate.

[0018] (5) Wrap the complete heating sheet (4) around the part (part) to be heated (1), and tie the complete heating sheet (4) firmly with wire. The heating sheets must not overlap to prevent overheating. No leakage should be allowed to prevent uneven heating.

[0019] (7) The complete heating plate (4) is wrapped with thermal insulation cotton.

[0020] (8) The heating wire is inserted into and out of the complete heating plate (4), and the outer tubular ceramic heating plate is used for external insulation. The end of the heating wire is connected to a quick plug, and the quick plug is connected to the heating cable of the heat treatment machine.

[0021] (9) Set the heat treatment machine parameters and perform heat treatment on the parts (parts).

[0022] Therefore, the present invention adopts the above-mentioned flexible ceramic heating sheet suitable for special-shaped pipe joints and the use method thereof, which has the following beneficial effects:

[0023] (1) The present invention is applicable to different types of heating cavities, and can be spliced ​​according to different pipe structure shapes. After the production is completed, the specifications can be adjusted according to the next target pipe, which is suitable for different parts to be heated;

[0024] (2) The present invention relies on the unique structural form of the heating plate and combines different threading and weaving methods to be applicable to the heat treatment of welds of various special-shaped pipe joints, especially for spherical, hemispherical heads and end covers that cannot be wrapped by traditional heating plates, and can achieve good heat treatment effects;

[0025] (3) The present invention runs the heating wire through the heating plate to generate heat from the inside of the ceramic plate, which is suitable for heat treatment scenarios of hundreds or thousands of degrees Celsius.

[0026] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a flexible ceramic heating sheet suitable for special-shaped pipe fitting joints of the present invention;

[0028] Figure 2 It is a cross-sectional view of a flexible ceramic heating sheet suitable for a special-shaped pipe fitting joint of the present invention;

[0029] Figure 3 This is a drawing of inserting a heating wire of a flexible ceramic heating sheet suitable for a special-shaped pipe fitting joint of the present invention;

[0030] Figure 4 This is a schematic diagram of the connection structure of the flexible ceramic heating plate in the second embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the connection structure of the flexible ceramic heating plate in the third embodiment of the present invention;

[0032] Figure 6 This is a dimension diagram of the flexible ceramic heating sheet in the first embodiment of the present invention;

[0033] Reference numerals:

[0034] 1. Flexible ceramic heating sheet; 2. Through hole; 3. Heating wire. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0036] Unless otherwise defined, technical or scientific terms used in the present invention shall have the common meanings understood by one having ordinary skills in the field to which the present invention belongs.

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention more clear, the following will be combined with the accompanying drawings in the embodiments of the present invention. Figures 1 to 5 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "surroundings", "lateral", "longitudinal", "length", "thickness", "angle", "up", "down", "left", "right", etc., indicating directions or positions, are limited to simplifying the description of the present invention rather than specific positions or directions. The above terms are not limitations of the present invention.

[0039] The specific connection methods of each part of the present invention adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0040] As attached Figure 1 As shown, the present invention provides a flexible ceramic heating plate 1 suitable for special-shaped pipe fittings, including a plurality of flexible ceramic heating plates 1 in a regular hexagonal prism configuration, wherein three parallel side surfaces of the flexible ceramic heating plate 1 are each provided with two through holes 2 for placing heating wires 3, and the two through holes 2 are parallel to each other.

[0041] As the instruction manual Figure 2As shown, in a single flexible ceramic heating sheet 1, six through holes 2 are divided into three groups, all of which intersect inside the flexible ceramic heating sheet 1. Therefore, every two through holes 2 are connected in the middle part. After the heating wire 3 passes through the head of a through hole 2, it can pass through the tail of the through hole 2 and can also pass through the heads and tails of the other five through holes 2 except this through hole 2. The insertion method of the heating wire 3 is as follows: Figure 3 shown.

[0042] The ratio of the height of the flexible ceramic heating plate 1 to the diameter of the hexagonal circumscribed circle is 1:3, the ratio of the diameter of the through hole 2 to the side length of the hexagon is 3:10, and the ratio of the center distance of two through holes 2 on the same side to the side length of the hexagon is 2:15.

[0043] The present invention also discloses a method for using the above-mentioned flexible ceramic heating sheet 1 suitable for special-shaped pipe joints. The flexible ceramic heating sheet 1 is applied to the heat treatment of the weld of the special-shaped pipe joint, comprising the following steps:

[0044] (1) Lofting a plane geometric figure according to the part to be heated;

[0045] (2) The plane geometric figure is enlarged according to the thickness of the flexible ceramic heating sheet, so that the enlarged figure with a certain thickness can completely wrap the part to be heated;

[0046] (3) placing the sides of several flexible ceramic heating sheets facing each other to form a planar geometric figure after lofting, inserting the heating wire into the first heating sheet hole at any end of the edge of the flexible ceramic heating sheet constituting the planar geometric figure, and connecting all the flexible ceramic heating sheets in series using a Z-shaped insertion method, so that the heating wires are evenly arranged in the planar geometric figure;

[0047] (4) Each flexible ceramic heating sheet is connected in series with at least two adjacent flexible ceramic heating sheets, and each flexible ceramic heating sheet forms an interconnected whole to form a complete heating sheet;

[0048] (5) Wrap the complete heating sheet around the part to be heated and tie it securely with wire. The flexible ceramic heating sheets must not overlap or be missing.

[0049] (7) The complete heating plate is wrapped with thermal insulation cotton;

[0050] (8) After the heating wire is inserted into and out of the complete heating plate, the heating wire is led out of the heating plate and the outer cover of the tubular ceramic heating plate is insulated. The end of the heating wire is connected to a quick plug, and the quick plug is connected to the heating cable of the heat treatment machine;

[0051] (9) Set the heat treatment machine parameters to perform heat treatment on the parts to be heated.

[0052] Embodiment 1

[0053] This embodiment provides a flexible ceramic heating sheet 1, the structure of which is as shown in the attached specification. Figure 6 As shown, the flexible ceramic heating plate 1 is high-purity alumina ceramic, in a hexagonal prism configuration, with a hexagonal circumscribed circle diameter of 30 mm, a height of 10 mm, a through hole 2 diameter of 4.5 mm, and a center distance of 6.5 between two through holes 2 on the same side.

[0054] Embodiment 2

[0055] This embodiment provides an application of a flexible ceramic heating sheet, and the flexible ceramic heating sheet provided in the first embodiment is used to heat a planar component to be heated. Figure 4 As shown, the sides of several flexible ceramic heating sheets are opposite to each other, forming a planar geometric figure after lofting, and the nickel-chromium alloy heating wire 3 is inserted from the first heating sheet hole at any end of the edge of the flexible ceramic heating sheet, and all the flexible ceramic heating sheets are connected in series using a Z-shaped threading method, that is, a sheet-like structure weaving method is formed, so that the nickel-chromium alloy heating wire is evenly arranged in the planar geometric figure. The flexible ceramic heating sheet is made into a complete heating sheet, and the complete heating sheet is wrapped around the part to be heated, and the complete heating sheet is tied firmly with iron wire. The flexible ceramic heating sheets shall not overlap or leak; the complete heating sheet is wrapped with thermal insulation cotton; the heating wire is led out of the heating sheet part and the tubular ceramic heating sheet is covered for external insulation, and the end of the nickel-chromium alloy heating wire is connected to a quick plug, and the quick plug is connected to the heating cable of the heat treatment machine; the heat treatment machine parameters are set, and the part to be heated is heat treated.

[0056] Embodiment 3

[0057] This embodiment provides an application of a flexible ceramic heating sheet, and the flexible ceramic heating sheet provided in the first embodiment is used to heat a spherical or hemispherical head component to be heated. Figure 5 As shown, the sides of several flexible ceramic heating plates are opposite to each other, forming a geometric figure after lofting, and the flexible ceramic plates form an angle, thus forming a hemispherical shape, and the nickel-chromium alloy heating wire 3 is inserted from the first heating plate hole at any end of the edge of the flexible ceramic heating plate, and all the flexible ceramic heating plates are connected in series using a Z-shaped insertion method, so that the nickel-chromium alloy heating wire is evenly arranged in the plane geometric figure. The flexible ceramic heating plate is made into a complete heating plate, and the complete heating plate is wrapped around the part to be heated, and the complete heating plate is tied firmly with iron wire; the complete heating plate is wrapped with thermal insulation cotton; the heating wire is led out of the heating plate part and the tubular ceramic heating plate is covered for external insulation, and the end of the nickel-chromium alloy heating wire is connected to a quick plug, and the quick plug is connected to the heating cable of the heat treatment machine; the heat treatment machine parameters are set, and the part to be heated is heat treated.

[0058] Therefore, the present invention provides a flexible ceramic heating plate suitable for special-shaped pipe joints and a method of using the same. Relying on the unique structural form of the heating plate and combined with different threading and weaving methods, it can be suitable for the heat treatment of welds of various special-shaped pipe joints, especially for spherical, hemispherical heads and end covers that cannot be wrapped by traditional heating plates, and can achieve good heat treatment effects.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A flexible ceramic heating sheet suitable for special-shaped pipe joints, characterized in that: The invention comprises a plurality of flexible ceramic heating sheets in the shape of regular hexagonal prisms. The three parallel sides of the flexible ceramic heating sheets are each provided with two through holes for placing heating wires, and the two through holes are parallel to each other.

2. A flexible ceramic heating sheet suitable for special-shaped pipe joints according to claim 1, characterized in that: The six through holes intersect inside the flexible ceramic heating plate.

3. The flexible ceramic heating sheet suitable for special-shaped pipe joints according to claim 1, characterized in that: The ratio of the height of the flexible ceramic heating plate to the diameter of the hexagonal circumscribed circle is 1:3, the ratio of the diameter of the through hole to the side length of the hexagon is 3:10, and the ratio of the center distance of two through holes on the same side to the side length of the hexagon is 2:

15.

4. The flexible ceramic heating sheet suitable for special-shaped pipe joints according to claim 3, characterized in that: The hexagonal circumscribed circle of the flexible ceramic heating sheet has a diameter of 30 mm, a height of 10 mm, a diameter of a through hole of 4.5 mm, and a center distance between two through holes on the same side is 6.5 mm.

5. The flexible ceramic heating sheet suitable for special-shaped pipe joints according to claim 1, characterized in that: The heating wire is a nickel-chromium alloy heating wire, and the flexible ceramic heating plate is made of high-purity alumina ceramic.

6. A method for using the flexible ceramic heating sheet suitable for special-shaped pipe joints as claimed in any one of claims 1 to 5, characterized in that: The flexible ceramic heating sheet is used in the heat treatment of the weld seam of the special-shaped pipe fitting joint.

7. The method for using a flexible ceramic heating sheet suitable for a special-shaped pipe joint according to claim 6, characterized in that: The following steps are involved: (1) Lofting a plane geometric figure according to the part to be heated; (2) The plane geometric figure is enlarged according to the thickness of the flexible ceramic heating sheet, so that the enlarged figure with a certain thickness can completely wrap the part to be heated; (3) placing the sides of several flexible ceramic heating sheets facing each other to form a planar geometric figure after lofting, inserting the heating wire into the first heating sheet hole at any end of the edge of the flexible ceramic heating sheet constituting the planar geometric figure, and connecting all the flexible ceramic heating sheets in series using a Z-shaped insertion method, so that the heating wires are evenly arranged in the planar geometric figure; (4) Each flexible ceramic heating sheet is connected in series with at least two adjacent flexible ceramic heating sheets, and each flexible ceramic heating sheet forms an interconnected whole to form a complete heating sheet; (5) Wrap the complete heating sheet around the part to be heated and tie it securely with wire. The flexible ceramic heating sheets must not overlap or be missing. (7) The complete heating plate is wrapped with thermal insulation cotton; (8) After the heating wire is inserted into and out of the complete heating plate, the heating wire is led out of the heating plate and the outer cover of the tubular ceramic heating plate is insulated. The end of the heating wire is connected to a quick plug, and the quick plug is connected to the heating cable of the heat treatment machine; (9) Set the heat treatment machine parameters to perform heat treatment on the parts to be heated.

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