Heating furnace pipe and three-chamber continuous vacuum heat treatment furnace

Abstract

The invention relates to a heating furnace pipe and a three-chamber continuous vacuum heat treatment furnace, and the heating furnace pipe comprises a furnace body which comprises four furnace walls arranged in a surrounding manner; the furnace hearth is arranged in the furnace body; the four groups of supporting assemblies are fixedly arranged on the four furnace walls respectively; the heating assemblies are fixedly arranged on the supporting assembly respectively to form four heating subareas, each heating assembly comprises two heating belts, each heating belt comprises an input section, an output section and a heating section connected with the input section and the output section, the input sections of the two heating belts are mutually overlapped, the output sections of the two heating belts are mutually overlapped, and the heating sections of the two heating belts are mutually overlapped. The heating sections of the two heating belts are symmetrically arranged and are respectively laid in a half area of the heating subarea; the four heating subareas are arranged, all-around heat radiation is provided, and the heating sections of the heating belts are symmetrically arranged, so that the whole heating subareas are more uniformly paved with the heating belts, the heating temperature of the whole heating subareas is more uniform, and the overall temperature uniformity in the furnace is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum heat treatment, in particular to a heating furnace core and a three-chamber continuous vacuum heat treatment furnace. Background Art

[0002] With the development of vacuum heat treatment technology, vacuum heat treatment furnaces have been widely used in material heat treatment, achieving a heat treatment process without oxidation or decarburization in a vacuum environment. Currently, vacuum heat treatment furnaces generally use a circular furnace structure. The traditional circular three-temperature zone heating structure layout results in uneven heat radiation distribution, which easily forms temperature gradients within the furnace. This results in poor heating consistency on the workpiece, easily generating thermal stress, affecting heat treatment quality, and failing to meet the requirements of gradient heating or zoned constant temperature in complex processes. Summary of the Invention

[0003] Based on this, it is necessary to provide a heating furnace and a three-chamber continuous vacuum heat treatment furnace to address the problem of uneven temperature in the existing vacuum heat treatment furnace.

[0004] On the one hand, the present application provides a heating furnace, comprising: a furnace body, the furnace body comprising four furnace walls arranged around; a furnace bed, the furnace bed being arranged in the furnace body; four groups of support assemblies, the support assemblies being respectively fixed to the four furnace walls; and four groups of heating assemblies, the heating assemblies being respectively fixed to the support assemblies to form four heating zones, each group of the heating assemblies comprising two heating belts, the heating belts comprising an input section, an output section and a heating section connecting the input section and the output section, the input sections of the two heating belts being overlapped with each other, the output sections of the two heating belts being overlapped with each other, the heating sections of the two heating belts being arranged symmetrically, and being respectively laid in half of the heating zones.

[0005] In one embodiment, the heating section includes a straight segment and a serpentine segment, the straight segment extends straightly from the first end of the heating section, and the serpentine segment extends in a curved manner from the straight segment to the second end of the heating section, the first end is connected to one of the input section and the output section, and the second end is connected to the other of the input section and the output section.

[0006] In one embodiment, the support assembly includes a plurality of ceramic support members respectively fixed to the furnace wall, and the heating belt is fixed to the ceramic support members.

[0007] In one embodiment, the support assembly further includes a fixing wire, the ceramic support member is provided with a U-shaped groove and a wire hole, the heating belt is arranged in the U-shaped groove, and the fixing wire is passed through the wire hole to fix the heating belt.

[0008] In one embodiment, the support assembly further includes a plurality of fixing bolts, a plurality of fixing nuts and a plurality of ceramic sheets, the fixing bolts passing through the ceramic support and the furnace wall, the fixing nuts being threadedly fixed to the fixing bolts to fix the ceramic support to the furnace wall; the ceramic sheets are arranged between the heating belt and the fixing bolts.

[0009] In one embodiment, the support assembly further includes a ceramic sheet, and the ceramic sheet is disposed between the heating belt and the fixing bolt.

[0010] In one embodiment, the furnace body includes a plurality of heat-insulating layers and a plurality of spacers, and the spacers are respectively arranged at intervals between the heat-insulating layers.

[0011] In one embodiment, the distance between two adjacent thermal insulation layers is at least 7 mm.

[0012] In one embodiment, the plurality of thermal insulation layers are heat-resistant layers or corrosion-resistant layers, and the heat-resistant layers and the corrosion-resistant layers are arranged from the inner side to the outer side of the furnace body.

[0013] In one embodiment, the spacer is a U-shaped spacer, and the furnace body further includes a fixing screw and a matching nut. The fixing screw passes through the insulation layer and the U-shaped spacer, and the matching nut is threadedly fixed to the fixing screw to fix the insulation layer and the U-shaped spacer.

[0014] On the other hand, the present application provides a three-chamber continuous vacuum heat treatment furnace, comprising: a heat treatment furnace main body, the heat treatment furnace main body having a loading chamber, a heat treatment chamber and a unloading chamber arranged in sequence, the heat treatment chamber having a loading port connected to the loading chamber and a unloading port connected to the unloading chamber; a heating furnace core as described in any of the above, the heating furnace core is arranged in the heat treatment chamber and is respectively connected to the loading port and the unloading port; and an automatic loading and unloading device, the automatic loading and unloading device is respectively arranged in the loading chamber and the unloading chamber.

[0015] In summary, the heating furnace of the present application is formed by surrounding the furnace body structure with four furnace walls, and each furnace wall is provided with a heating component, which can form four independent heating zones, provide all-round heat radiation, effectively eliminate the temperature gradient caused by traditional unilateral heating, and improve the overall temperature uniformity in the furnace. The temperature of each heating zone can be adjusted separately, which can meet the needs of gradient heating or zone constant temperature in complex processes, ensure that the workpiece is heated more evenly, and reduce thermal stress. In addition, two heating belts are provided in each heating zone. By overlapping the input section and output section of the heating belt respectively and symmetrically arranging the heating sections of the heating belt, the input section and output section of the heating belt are both located in the middle of the heating zone. The heating belts can be arranged more reasonably and spread more evenly over the entire heating zone. The heating temperature of the entire heating zone is more uniform, the structure of the heating zone is more beautiful, and the heating power of the two heating belts can be matched, so that the heating temperature of the two heating belts is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional schematic diagram of a heating furnace provided in one embodiment of the present application;

[0017] Figure 2 A schematic diagram of temperature zones of a heating furnace according to the above embodiment of the present application is shown;

[0018] Figure 3 A cross-sectional schematic diagram of a heating furnace according to the above embodiment of the present application is shown;

[0019] Figure 4 A schematic perspective view of a heating belt for heating a furnace according to the above embodiment of the present application is shown;

[0020] Figure 5 A schematic plan view of a heating belt of a heating furnace according to the above embodiment of the present application is shown;

[0021] Figure 6 Shown as Figure 2 An enlarged schematic diagram of a part A of the heating furnace;

[0022] Figure 7 A schematic cross-sectional view of a three-chamber continuous vacuum heat treatment furnace provided for one embodiment of the present application.

[0023] Figure numerals: 100, heating furnace core; 10, furnace body; 11, insulation layer; 12, spacer; 13, fixing screw; 14, matching nut; 20, furnace bed; 30, support assembly; 31, ceramic support; 311, U-shaped groove; 312, wire hole; 32, fixing wire; 33, fixing bolt; 34, fixing nut; 35, ceramic sheet; 40, heating assembly; 41, heating belt; 411, input section; 412, output section; 413, heating section; 4131, straight segment; 4132, serpentine segment; 4133, first end; 4134, second end; 50, heating zone; 200, heat treatment furnace body; 210, loading chamber; 220, heat treatment chamber; 230, unloading chamber; 240, loading port; 250, unloading port; 300, automatic loading and unloading device. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0030] Based on the problem of uneven temperature in the existing vacuum heat treatment furnace, the present application provides a heating furnace and a three-chamber continuous vacuum heat treatment furnace, which can provide four independent heating zones to ensure that the workpiece is heated more evenly.

[0031] For details, please refer to Figure 1 、 Figure 2 and Figure 3On the one hand, the present application provides a heating furnace 100, which may include a furnace body 10, a furnace bed 20, four groups of support assemblies 30 and four groups of heating assemblies 40. The furnace body 10 includes four furnace walls arranged around it, and the furnace bed 20 is arranged in the furnace body 10 for placing the workpiece to be heat treated. The support assemblies 30 are respectively fixed to the four furnace walls, and the heating assemblies 40 are respectively fixed to the support assemblies 30 to form four heating zones 50. Each group of heating assemblies 40 includes two heating belts 41, and the heating belt 41 includes an input section 411, an output section 412 and a heating section 413 connecting the input section 411 and the output section 412. The input section 411 and the output section 412 are used to be connected to a power source respectively. After the current is passed through the heating section 413, it can generate heat. The input sections 411 of the two heating belts 41 overlap each other, the output sections 412 of the two heating belts 41 overlap each other, and the heating sections 413 of the two heating belts 41 are symmetrically arranged and respectively laid in half of the heating partition 50 .

[0032] As can be understood, the heating furnace 100 of the present application utilizes a furnace body 10 structure formed by surrounding four furnace walls, each of which is equipped with a heating assembly 40, to form four independent heating zones 50. This provides omnidirectional heat radiation, effectively eliminating the temperature gradients caused by traditional unilateral heating and improving overall temperature uniformity within the furnace. Each heating zone 50 can be individually temperature-controlled, meeting the requirements for gradient heating or zoned constant temperature in complex processes, ensuring more uniform heating of the workpiece and reducing thermal stress. In addition, two heating belts 41 are provided in each heating zone 50. By overlapping the input section 411 and the output section 412 of the heating belt 41 respectively and symmetrically arranging the heating section 413 of the heating belt 41, the input section 411 and the output section 412 of the heating belt 41 are both located in the middle of the heating zone 50. The heating belts 41 can be arranged more reasonably and spread more evenly over the entire heating zone 50. The heating temperature of the entire heating zone 50 is more uniform, the structure of the heating zone 50 is more beautiful, and the heating power of the two heating belts 41 can be matched, so that the heating temperature of the two heating belts 41 is more uniform.

[0033] Optionally, in some embodiments, Figure 3 、 Figure 4 and Figure 5The figure shows an example of the arrangement of the heating section 413 of a heating belt 41 of the present application, wherein the heating section 413 includes a straight segment 4131 and a serpentine segment 4132. The straight segment 4131 extends straightly from the first end 4133 of the heating section 413, and the serpentine segment 4132 extends from the straight segment 4131 in a curved manner to the second end 4134 of the heating section 413. The first end 4133 is connected to one of the input section 411 and the output section 412, and the second end 4134 is connected to the other of the input section 411 and the output section 412. In this way, the serpentine segment 4132 can more comprehensively cover the heating zone 50, and the straight segment 4131 can connect the end of the serpentine segment 4132 away from the input section 411 or the output section 412 to the middle of the heating zone 50, thereby satisfying the layout design of the input section 411 and the output section 412 being located in the middle of the heating zone 50, making the distribution of the heating belt 41 more uniform.

[0034] Optionally, in some embodiments, the material of the heating belt 41 can be a nickel-iron alloy material. Nickel-iron alloy has the characteristics of high resistivity, strong oxidation resistance and high temperature resistance. The heating belt 41 made of nickel-iron alloy has higher stability and longer service life. The heating belt 41 can maintain continuous and stable heating in a high temperature environment, making the heating temperature of the entire heating zone 50 more uniform.

[0035] Optionally, since the heating belt 41 and the furnace body 10 are usually metal structures, and the heating belt 41 needs to be supplied with current, in order to avoid the risk of short circuit, as shown in FIG. Figure 2 and Figure 6 As shown, in some embodiments, the support assembly 30 includes multiple ceramic support members 31, each of which is fixed to the furnace wall, and the heating belt 41 is fixed to the ceramic support members 31. On the one hand, the ceramic support members 31 have excellent insulation properties, which can separate the heating belt 41 from the furnace wall, avoiding the risk of short circuit caused by contact between the heating belt 41 and the furnace wall; on the other hand, the ceramic support members 31 have high high temperature resistance and are not easily deformed when exposed to high temperature for a long time, which can reduce safety hazards during heat treatment.

[0036] Alternatively, as Figure 6 As shown, in some embodiments, the support assembly 30 further includes a fixing wire 32, the ceramic support 31 is provided with a U-shaped groove 311 and a wire hole 312, the heating belt 41 is disposed in the U-shaped groove 311, and the fixing wire 32 is passed through the wire hole 312 to secure the heating belt 41. In this way, the U-shaped groove 311 can position the heating belt 41, and the fixing wire 32 can be used to bind the heating belt 41, thereby more firmly securing the heating belt 41 to the ceramic support 31.

[0037] Optionally, in some embodiments, the material of the fixing wire 32 may be nickel-iron alloy. The fixing wire 32 made of nickel-iron alloy can still maintain high structural strength at high temperatures, has better high-temperature creep resistance than ordinary metals, and can avoid relaxation or breakage caused by thermal stress.

[0038] Alternatively, as Figure 6 As shown, in some embodiments, the support assembly 30 further includes a plurality of fixing bolts 33 and a plurality of fixing nuts 34. The fixing bolts 33 pass through the ceramic support 31 and the furnace wall, and the fixing nuts 34 are screwed and fixed to the fixing bolts 33 to fix the ceramic support 31 to the furnace wall.

[0039] Alternatively, as Figure 6 As shown, in some embodiments, the support assembly 30 further includes a ceramic sheet 35, which is disposed between the heating belt 41 and the fixing bolt 33 and can be used for fixing. In this way, if the fixing bolt 33 and the fixing nut 34 fail to cooperate, the ceramic sheet 35 separates the fixing bolt 33 from the heating belt 41, preventing the fixing bolt 33 from slipping and contacting the heating belt 41, avoiding short circuit problems and improving the safety performance of the heating furnace 100.

[0040] Alternatively, as Figure 6 As shown, in some embodiments, the furnace body 10 includes multiple insulation layers 11 and multiple spacers 12, with the spacers 12 being spaced apart between the insulation layers 11. Thus, by spacing the insulation layers 11 apart, thermal resistance can be increased, heat conduction can be reduced, and convection heat loss can be suppressed by utilizing the air gaps between each insulation layer 11, thereby improving the thermal insulation effect of the furnace body 10.

[0041] Optionally, in some embodiments, the heat insulation layer 11 is a metal reflective screen, which can reflect heat radiation back into the furnace body 10 to further improve the heat preservation effect of the furnace body 10.

[0042] Optionally, since the overall thermal resistance of the insulation layer 11 is related to the spacing between each insulation layer 11, the larger the spacing between each insulation layer 11, the greater the overall thermal resistance of the insulation layer 11. Therefore, in some embodiments, the spacing between two adjacent insulation layers 11 is at least 7 mm. In this way, by controlling the spacing between two adjacent insulation layers 11 to be greater than 7 mm, the overall thermal resistance of multiple insulation layers 11 can be improved, thereby allowing the furnace body 10 to have a better thermal insulation effect.

[0043] Optionally, in some embodiments, the plurality of heat-insulating layers 11 are heat-resistant layers or corrosion-resistant layers, and the heat-resistant layers and corrosion-resistant layers are arranged from the inside to the outside of the furnace body 10. The heat-resistant layer has high high-temperature resistance and oxidation resistance, can directly face the high-temperature area, and reduce heat radiation outward. The corrosion-resistant layer has good corrosion resistance, can be used in humid or corrosive gas environments, and can assist in heat insulation.

[0044] For example, in one embodiment, the furnace body 10 includes five insulation layers 11, each 7 mm apart. The two inner insulation layers 11 are made of 310S stainless steel. Leveraging its excellent high-temperature and oxidation resistance, the two inner insulation layers 11 can withstand temperatures up to 1150°C. The three outer insulation layers 11 are made of 316L stainless steel. Leveraging its excellent corrosion resistance, the three outer insulation layers 11 are suitable for use in humid or corrosive environments.

[0045] Alternatively, as Figure 6 As shown, in some embodiments, the spacer 12 is a U-shaped spacer, and the furnace body 10 also includes a fixing screw 13 and a matching nut 14. The fixing screw 13 is inserted through the insulation layer 11 and the U-shaped spacer, and the matching nut 14 is screwed and fixed to the fixing screw 13 to fix the insulation layer 11 and the U-shaped spacer. In this way, the fixing screw 13 cooperates with the fixing nut 34 to lock the insulation layer 11 and the U-shaped spacer, achieving multi-layer positioning and fixation. The U-shaped structure of the U-shaped spacer can evenly distribute the tightening force of the fixing screw 13 to the insulation layer 11, avoiding deformation of the insulation layer 11 caused by local stress concentration.

[0046] On the other hand, Figure 7 As shown, the present application also provides a three-chamber continuous vacuum heat treatment furnace, which can include a heat treatment furnace body 200 and a heating furnace 100 as described above. The heat treatment furnace body 200 has a loading chamber 210, a heat treatment chamber 220, and a discharge chamber 230 arranged in sequence. The heat treatment chamber 220 has a loading port 240 connected to the loading chamber 210 and a discharge port 250 connected to the discharge chamber 230. The heating furnace 100 is arranged in the heat treatment chamber 220 and is respectively connected to the loading port 240 and the discharge port 250. Automatic loading and unloading devices 300 are respectively arranged in the loading chamber 210 and the discharge chamber 230 for automatic loading and unloading. In this way, the four furnace walls arranged around the heating furnace core 100 can form a front-to-back through-design structure. The three-chamber continuous vacuum heat treatment furnace utilizes the front-to-back through-design structure of the heating furnace core 100 to realize the loading and unloading method of the front side loading and the rear side unloading. In conjunction with the automatic loading and unloading device 300 located in the loading chamber 210 and the unloading chamber 230, continuous and uninterrupted production can be achieved with higher heat treatment efficiency.

[0047] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A heating furnace, characterized in that: include: A furnace body, the furnace body comprising four surrounding furnace walls; a hearth, the hearth being arranged in the furnace body; Four groups of support assemblies, each of which is fixed to the four furnace walls; as well as Four groups of heating components are respectively fixed to the supporting components to form four heating zones. Each group of heating components includes two heating belts. The heating belts include an input section, an output section and a heating section connecting the input section and the output section. The input sections of the two heating belts are overlapped with each other, the output sections of the two heating belts are overlapped with each other, and the heating sections of the two heating belts are symmetrically arranged and respectively laid in half of the heating zone.

2. The heating furnace according to claim 1, characterized in that: The heating section includes a straight segment and a serpentine segment, the straight segment extends straightly from the first end of the heating section, and the serpentine segment extends in a curved manner from the straight segment to the second end of the heating section, the first end is connected to one of the input section and the output section, and the second end is connected to the other of the input section and the output section.

3. The heating furnace according to claim 1, characterized in that: The support assembly includes a plurality of ceramic support members respectively fixed on the furnace wall, and the heating belt is fixed on the ceramic support members.

4. The heating furnace according to claim 3, characterized in that: The support assembly also includes a fixing wire. The ceramic support is provided with a U-shaped groove and a wire hole. The heating belt is arranged in the U-shaped groove. The fixing wire is passed through the wire hole to fix the heating belt.

5. The heating furnace according to claim 4, characterized in that: The support assembly also includes a plurality of fixing bolts, a plurality of fixing nuts and a plurality of ceramic sheets. The fixing bolts are passed through the ceramic support and the furnace wall. The fixing nuts are screwed and fixed to the fixing bolts to fix the ceramic support to the furnace wall. The ceramic sheets are arranged between the heating belt and the fixing bolts.

6. The heating furnace according to any one of claims 1 to 5, characterized in that: The furnace body includes a plurality of heat insulation layers and a plurality of spacers, and the spacers are respectively arranged between the heat insulation layers at intervals.

7. The heating furnace according to claim 6, characterized in that: The distance between two adjacent thermal insulation layers is at least 7 mm.

8. The heating furnace according to claim 6, characterized in that: The plurality of heat-insulating layers are heat-resistant layers or corrosion-resistant layers respectively, and the heat-resistant layers and the corrosion-resistant layers are arranged from the inner side to the outer side of the furnace body.

9. The heating furnace according to claim 6, characterized in that: The spacer is a U-shaped spacer, and the furnace body also includes a fixing screw and a matching nut. The fixing screw is passed through the insulation layer and the U-shaped spacer, and the matching nut is screwed and fixed to the fixing screw to fix the insulation layer and the U-shaped spacer.

10. A three-chamber continuous vacuum heat treatment furnace, characterized in that: include: A heat treatment furnace body, wherein the heat treatment furnace body comprises a loading chamber, a heat treatment chamber, and a unloading chamber which are sequentially arranged, and the heat treatment chamber comprises a loading port communicating with the loading chamber and a unloading port communicating with the unloading chamber; The heating furnace according to any one of claims 1 to 9, wherein the heating furnace is arranged in the heat treatment chamber and is respectively connected to the loading port and the unloading port; and Automatic loading and unloading devices are respectively arranged in the loading chamber and the unloading chamber.

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