Molybdenum heating belt for vacuum heat treatment furnace

Abstract

The utility model provides a molybdenum heating belt for a vacuum heat treatment furnace and belongs to the technical field of heating sheets. Comprising a long-strip heating piece body, a plurality of heating piece connecting long-strip holes are evenly distributed in the middle of the long-strip heating piece body in the length direction, a compensation gasket is fixed to the position, corresponding to each heating piece connecting long-strip hole, of one side face of the long-strip heating piece body, and gasket connecting long-strip holes are formed in the compensation gaskets. The gasket connecting long-strip holes and the heating piece connecting long-strip holes are opposite in the front-back direction and are the same in size and shape, and compensation gaskets are not arranged at the heating piece connecting long-strip holes in the two ends of the long-strip heating piece body. According to the utility model, the connecting holes on the strip-shaped heating sheet body and the compensation gasket are designed to be strip-shaped holes, the heating sheet can be freely extended and contracted in the expansion and contraction process, and the edges of the holes cannot touch and lock bolts in the expansion and contraction process, so that the strip-shaped heating sheet is effectively prevented from being deformed, and the edges of the holes cannot generate cracks; therefore, the service life of parts is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of heating sheets, and particularly relates to a molybdenum heating belt for a vacuum heat treatment furnace. Background Art

[0002] The heating element used in a vacuum heat treatment annealing furnace is a strip-shaped heating sheet, which generates heat after being electrified to heat parts. The strip-shaped heating sheet is fixed on the furnace wall. Currently, circular holes are generally provided on the heating sheet for fixing, and a compensation gasket is provided at the circular holes. The compensation gasket is also provided with circular holes corresponding to those on the heating sheet. After assembly, the two circular holes are directly opposite and coaxial, and are connected to the inner wall of the furnace body through bolts. During the fixing process, the bolts are not tightened to ensure that the heating sheet can expand and contract during use. However, during the thermal expansion and contraction process, since the circular holes and the bolts are in a mating fit, there is no shrinkage amount. During the contraction process, the circular holes and the bolts will be locked, resulting in deformation and cracking of the edges of the circular holes on the heating sheet, leading to scrapping of the heating sheet and reducing the service life of the heating sheet. Therefore, it is necessary to improve the structure of the strip heating sheet to solve the problems existing in the prior art. Summary of the Utility Model

[0003] The technical problem solved by the utility model: Provide a molybdenum heating belt for a vacuum heat treatment furnace. The purpose of the utility model is to improve the structure of the strip heating sheet so that the strip heating sheet can freely expand and contract during the thermal expansion and contraction process, prevent the strip heating sheet from deforming and cracking, and extend the service life of the parts.

[0004] To achieve the above object, the technical solution adopted by the utility model is:

[0005] The molybdenum heating belt for a vacuum heat treatment furnace includes a strip heating sheet body. The strip heating sheet body is in a strip-shaped sheet structure. A plurality of heating sheet connection long holes are evenly distributed along the length direction in the middle of the strip heating sheet body. On one side of the strip heating sheet body corresponding to each heating sheet connection long hole, a compensation gasket is fixed. The compensation gasket is provided with gasket connection long holes. The gasket connection long holes and the heating sheet connection long holes are directly opposite front and back and have the same size and shape. No compensation gasket is provided at the heating sheet connection long holes at both ends of the strip heating sheet body.

[0006] Further limitation to the above solution: Both sides of the compensation gasket are fixedly connected to the strip heating sheet body through rivets. The strip heating sheet body is provided with rivet holes Ⅰ for the rivets to pass through, and the compensation gasket is provided with rivet holes Ⅱ for the rivets to pass through.

[0007] Further limitation to the above solution: The strip heating sheet body, the compensation gasket and the rivets are made of the same metal material.

[0008] For further limitation of the above solution, the strip heating element body, the compensating gasket and the rivet are all made of high-temperature molybdenum, molybdenum lanthanum alloy, tungsten or tungsten alloy materials.

[0009] For further limitation of the above solution, reinforcing ribs are provided on both long sides of the strip heating element body, and the distances a from both ends of the reinforcing ribs to the positions near the corresponding ends on the strip heating element body are 60 - 70 mm; the reinforcing ribs protrude towards the side where the compensating gasket is provided.

[0010] For further limitation of the above solution, the compensating gasket is arranged between the reinforcing ribs protruding on both sides and is in close contact with the concave plane formed in the middle thereof.

[0011] Advantages of the present utility model compared with the prior art:

[0012] 1. In this solution, by setting the connecting holes on the strip heating element body and the compensating gasket of the strip heating element as long holes along the length direction, the strip heating element can freely elongate and contract during the process of thermal expansion and contraction. The long holes provide sufficient margin, so that the hole edges will not touch the bolts during the telescopic process of the strip heating element, and the bolts will not be locked, effectively preventing the strip heating element from deforming, and no cracks will occur at the hole edges, thereby prolonging the service life of the parts;

[0013] 2. In this solution, a compensating gasket is fixed on one side surface of the strip heating element body corresponding to the connecting long holes of the heating element. One function of the compensating gasket is to reinforce the holes to further prevent cracking at the connecting hole edges due to thermal expansion and contraction; another function is to prevent the power from decreasing when the current passes through the connecting holes, for current compensation;

[0014] 3. In this solution, by providing reinforcing ribs on both long sides of the strip heating element body, it is used to enhance the strength of the strip heating element and prevent the problem that the strip heating element cracks due to bending during transportation. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the strip heating element with reinforcing ribs in the present utility model;

[0016] Figure 2 is the present utility model Figure 1 the cross-sectional structural diagram shown in the A - A direction in;

[0017] Figure 3 is the present utility model Figure 1 the cross-sectional structural diagram shown in the B - B direction in;

[0018] Figure 4 is the present utility model Figure 1 the cross-sectional structural diagram shown in the C - C direction in. Detailed Embodiment

[0019] Next, in combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present utility model.

[0020] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0021] Please refer to Figures 1-4 , and details of the embodiments of the present utility model will be described.

[0022] Embodiment 1: Molybdenum heating belt for vacuum heat treatment furnace. Refer to Figure 1 As shown, it includes a long strip heating sheet body 1, and the long strip heating sheet body 1 is a long strip sheet structure. In this embodiment, the length of the long strip heating sheet is 900 mm, the width is 45 mm, and the thickness is 1.2 mm. Along the length direction in the middle of the long strip heating sheet body 1, 6 heating sheet connection long holes 1-1 are evenly distributed. On one side of the long strip heating sheet body 1 corresponding to each heating sheet connection long hole 1-1, a compensation gasket 2 is fixed. The compensation gasket 2 is provided with a gasket connection long hole 2-1. The gasket connection long hole 2-1 and the heating sheet connection long hole 1-1 are directly opposite front and back and have the same size and shape. At the heating sheet connection long holes 1-1 at both ends of the long strip heating sheet body 1, the compensation gasket 2 is not provided. In this embodiment, the compensation gasket 2 is a rectangular structure with a length of 35 and a width of 33; the sizes of the heating sheet connection long hole 1-1 and the gasket connection long hole 2-1 are waist-shaped holes of 11.5 mm * 23 mm.

[0023] In the above structure, by setting the connection holes on the long strip heating sheet body and the compensation gasket of the long strip heating sheet into long holes along the length direction, the long strip heating sheet can freely elongate and contract during the process of thermal expansion and contraction. The long holes provide sufficient margin, so that the hole edge of the long strip heating sheet will not touch the bolt during the expansion and contraction process, and will not lock the bolt, effectively preventing the long strip heating sheet from deforming, and no cracks will occur at the hole edge, thereby prolonging the service life of the part.

[0024] Specifically, refer to Figure 3As shown, both sides of the compensation gasket 2 are fixedly connected to the strip heating element body 1 by rivets 3. The strip heating element body 1 is provided with rivet holes Ⅰ1-3 for the rivets 3 to pass through, and the compensation gasket 2 is provided with rivet holes Ⅱ2-2 for the rivets 3 to pass through.

[0025] In this structure, the function of the compensation gasket is, firstly, to reinforce the holes to further prevent cracking at the edges of the connection holes due to thermal expansion and contraction; secondly, to prevent the power from decreasing when the current passes through the connection holes, for current compensation.

[0026] Preferably, the strip heating element body 1, the compensation gasket 2 and the rivets 3 are all made of high-temperature molybdenum, molybdenum lanthanum alloy, tungsten or tungsten alloy materials.

[0027] Embodiment 2: Refer to Figure 1 and 2 As shown, on the basis of the structure of Embodiment 1, reinforcing ribs 1-2 are provided on both long sides of the strip heating element body 1, and the reinforcing ribs 1-2 protrude towards the side where the compensation gasket 2 is provided.

[0028] In this embodiment, by providing reinforcing ribs on both long sides of the strip heating element body, the strength of the strip heating element is enhanced to prevent the problem of cracking caused by bending of the strip heating element during transportation.

[0029] Specifically, the distance between the reinforcing ribs 1-2 and the edge of the strip heating element body is 3 mm. The distances a from both ends of the reinforcing ribs 1-2 to the positions near the corresponding two ends of the strip heating element body 1 are 60 - 70 mm. Refer to Figure 4 As shown; that is to say, both ends of the strip heating element body 1 are flat without pressure ribs and are used for connecting the power supply. When connecting, the adjacent two ends need to be overlapped, and a ceramic sheet is added between them, which needs to be closely attached to prevent short circuit. Therefore, making them flat can ensure close attachment.

[0030] The compensation gasket 2 is arranged between the two protruding reinforcing ribs 1-2 and is in close contact with the concave plane formed in the middle.

[0031] In the above two embodiments, when the strip heating element is installed flat, a structure with ribs is selected to improve its strength. When it needs to be bent during installation, a structure without ribs is selected to prevent bending and cracking.

[0032] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Molybdenum heating strip for vacuum heat treatment furnace, comprising a strip-shaped heating sheet body (1), characterized in that: The long strip heating plate body (1) is a long strip-shaped structure, and a plurality of heating plate connecting long strip holes (1-1) are evenly distributed in the middle of the long strip heating plate body (1) along the length direction. A compensation gasket (2) is fixed on one side of the long strip heating plate body (1) corresponding to each of the heating plate connecting long strip holes (1-1). The compensation gasket (2) is provided with a gasket connecting long strip hole (2-1). The gasket connecting long strip hole (2-1) and the heating plate connecting long strip hole (1-1) are opposite to each other front and back and have the same size and shape. No compensation gasket (2) is provided at the heating plate connecting long strip holes (1-1) at both ends of the long strip heating plate body (1).

2. The molybdenum heating belt for vacuum heat treatment furnace according to claim 1, wherein: The two sides of the compensation gasket (2) are fixedly connected to the long heating plate body (1) by rivets (3); the long heating plate body (1) is provided with a rivet hole I (1-3) for the rivet (3) to pass through, and the compensation gasket (2) is provided with a rivet hole II (2-2) for the rivet (3) to pass through.

3. The molybdenum heating strip for vacuum heat treatment furnace according to claim 2, wherein: The long strip heating plate body (1), the compensation gasket (2) and the rivet (3) are made of the same metal material.

4. The molybdenum heating strip for a vacuum heat treatment furnace according to claim 3, characterized in that: The long strip heating plate body (1), the compensation gasket (2) and the rivet (3) are all made of high-temperature molybdenum, molybdenum-lanthanum alloy, tungsten or tungsten alloy material.

5. The molybdenum heating belt for a vacuum heat treatment furnace according to claim 1, wherein: The two long sides of the long heating plate body (1) are provided with reinforcing ribs (1-2), and the distance a between the two ends of the reinforcing ribs (1-2) and the corresponding two ends of the long heating plate body (1) is 60-70 mm; the reinforcing ribs (1-2) protrude toward the side provided with the compensation gasket (2).

6. The molybdenum heating belt for vacuum heat treatment furnace according to claim 5, wherein: The compensation gasket (2) is arranged between the reinforcing ribs (1-2) protruding on both sides and is in close contact with the concave plane formed between them.

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