CN209830530U - Brazing furnace for large-scale component - Google Patents
Brazing furnace for large-scale component Download PDFInfo
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- CN209830530U CN209830530U CN201920669029.7U CN201920669029U CN209830530U CN 209830530 U CN209830530 U CN 209830530U CN 201920669029 U CN201920669029 U CN 201920669029U CN 209830530 U CN209830530 U CN 209830530U
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- furnace
- hearth
- muffle
- stainless steel
- brazing
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- 238000005219 brazing Methods 0.000 title claims abstract description 39
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 30
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 28
- 239000010439 graphite Substances 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 238000010583 slow cooling Methods 0.000 claims abstract description 11
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 34
- 239000010935 stainless steel Substances 0.000 claims description 34
- 239000000498 cooling water Substances 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 229910052593 corundum Inorganic materials 0.000 abstract description 6
- 239000010431 corundum Substances 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011094 fiberboard Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model discloses a stove of brazing for large-scale component, the induction cooker comprises a cooker bod, the inside furnace that is formed with sharp tunnel type of furnace body, furnace is the preheating section respectively from the entry to the export in proper order, the heating zone, the slow cooling section, be provided with heating device and temperature control device in the furnace body, be provided with the protective atmosphere input port on the furnace body, the furnace body is provided with removable cover respectively in furnace's entry and export, be provided with in the furnace and extend and all set up open-ended muffle liner along length direction, be provided with the graphite slide in the muffle liner, be provided with a plurality of corundum push pedals in the graphite slide, the furnace body is provided with in furnace's entrance and is used for promoting the gliding material loading push pedal mechanism of corundum mullite push pedal along length direction in the graphite slide, it puts the position to be provided with the travelling car between the push pedal. The utility model discloses can satisfy the big and heavy work piece of size needs of brazing of atmosphere protection in succession to can reduce production and maintenance cost.
Description
Technical Field
The utility model belongs to the technical field of the equipment of brazing, concretely relates to stove of brazing for large-scale component.
Background
At present, vacuum brazing is mainly adopted for large and heavy workpieces for high-temperature brazing, but the vacuum brazing has high cost and low efficiency; the continuous type atmosphere protection mesh belt brazing furnace needs to adopt a mesh belt to continuously operate on a muffle tank, and because the muffle tank and the mesh belt are both made of 310S stainless steel, the bearing capacity is poor at high temperature, only batch brazing of small workpieces can be met, and the continuous type atmosphere protection mesh belt brazing furnace is not suitable for large-area heavy workpiece brazing. And the continuous atmosphere protection mesh belt brazing furnace suitable for small workpieces needs to replace the muffle tank and the stainless steel mesh belt once every year due to large thermal deformation, the replacement cost is more than 10 ten thousand yuan each time, and the maintenance cost is high.
Chinese patent application No. 201310224338.0 discloses a brazing equipment, its brazing furnace chamber is the continuous cavity of "returning" font, and its structure is complicated, and the associative action is more, will lead to whole production line to stop production as long as certain link goes wrong, and because equipment moves under high temperature, the heat altered shape is different, the push pedal jamming phenomenon often appears to, and its loading board is a whole, in-process at last unloading, the loading board leads to breaking because of the rigid shock.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one of the above technical problems, the utility model provides a brazing furnace for large-scale component.
The purpose of the utility model is realized through the following technical scheme:
the utility model provides a brazing furnace for large-scale component, includes the furnace body, the furnace body is inside to be formed with sharp tunnel type's furnace, be provided with heating device and temperature control device in the furnace body, be provided with the protective atmosphere input port that communicates to furnace on the furnace body, the furnace body is provided with removable cover respectively at furnace's entry and export, be provided with in the furnace and extend along length direction and both ends all set up open-ended muffle container, the interior bottom of muffle container is provided with the graphite slide along length direction, be provided with a plurality of corundum mullite push pedals in the graphite slide, the furnace body is provided with the material loading push pedal mechanism that is used for promoting corundum mullite push pedal to slide along length direction in the graphite slide at furnace's entry, be provided with the dolly that can place the travelling car and place the position between the push pedal end of material push pedal mechanism and the entry of furnace.
As a further improvement, the heating device comprises a plurality of resistance wires arranged at the top and the bottom of the hearth, the temperature control device comprises a controller and a plurality of thermocouples arranged in the hearth or the muffle at intervals, the thermocouples are connected with the controller to send temperature signals to the controller, and the controller is connected with the resistance wires to control the current passing through each resistance wire.
As a further improvement, the furnace body is provided with grooves at the top and the bottom of the hearth, the heating device comprises a ceramic tube, the resistance wire is arranged in the ceramic tube, and the ceramic tube is arranged in the groove.
As a further improvement, the muffle is composed of a stainless steel liner shell and stainless steel reinforcing ribs arranged outside the stainless steel liner shell, the stainless steel liner shell is formed by bending and splicing stainless steel plates, and the stainless steel reinforcing ribs are welded on the outer side of the stainless steel liner shell.
As a further improvement, the hearth is sequentially and respectively provided with a preheating section, a heating section and a slow cooling section from an inlet to an outlet, and a cooling water path is arranged on the outer side of the muffle liner positioned at the slow cooling section.
As a further improvement, the cooling water path surrounds the periphery of the muffle.
As a further improvement, the cooling water path extends along the length and width directions of the muffle furnace, the inlet of the cooling water path is arranged at one end of the muffle furnace close to the outlet of the hearth, and the outlet is arranged at the other end of the muffle furnace.
As a further improvement, the stainless steel reinforcing ribs are stainless steel pipes, and the cooling water path is formed by inner cavities of the stainless steel pipes.
As a further improvement, the graphite slide way is composed of a bottom plate and side plates vertically arranged on two sides of the bottom plate.
As a further improvement, a corundum-mullite support plate is arranged at the bottom of the hearth, and the muffle is arranged on the corundum-mullite support plate.
The utility model provides a brazing furnace for large-scale components, which comprises a furnace body, wherein a linear tunnel type hearth is formed inside the furnace body, the hearth is respectively provided with a preheating section, a heating section and a slow cooling section from an inlet to an outlet, a heating device and a temperature control device are arranged in the furnace body, the furnace body is provided with a protective atmosphere input port communicated to the hearth, the furnace body is respectively provided with a movable cover plate at the inlet and the outlet of the hearth, a muffle furnace which extends along the length direction and is provided with openings at both ends is arranged in the hearth, a graphite slide way is arranged at the inner bottom of the muffle furnace along the length direction, a plurality of corundum-mullite push plates are arranged in the graphite slide way, a feeding push plate mechanism for pushing the corundum-mullite push plates to slide in the graphite slide way along the length direction is arranged at the inlet of the furnace body, and a trolley placing position capable of placing a moving trolley is arranged between the push plate end of the feeding push plate mechanism and the inlet of the hearth. The utility model adopts the linear tunnel type hearth and the high temperature resistant graphite slide way, the corundum-mullite push plate carries the large and heavy workpiece to slide on the graphite slide way, and the phenomenon of push plate clamping stagnation caused by inconsistent high temperature thermal deformation is not easy to occur; in addition, the pushing push plate adopts a small-block splicing structure, so that the impact of an upper workpiece and a lower workpiece can be greatly buffered, the service life is prolonged, and the manufacturing cost and the maintenance cost are reduced; in addition, the corundum-mullite push plate is conveyed to the inlet from the outlet of the hearth through the movable trolley, and is pushed through the feeding push plate mechanism, so that continuous production is realized, and the efficiency is high. The utility model discloses can satisfy the big and heavy work piece of size needs of brazing of atmosphere protection in succession to can reduce production and maintenance cost.
Drawings
The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.
FIG. 1 is a schematic structural diagram of a brazing furnace for large components according to the present invention.
Fig. 2 is a schematic cross-sectional view of the furnace body of the brazing furnace for large-sized members according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, and it should be noted that the embodiments and features of the embodiments of the present invention can be combined with each other without conflict.
As shown in figures 1 and 2, the embodiment of the utility model provides a brazing furnace for large-scale component, including furnace body 1, furnace 2 that the inside sharp tunnel type that is formed with of furnace body 1. The hearth 2 is respectively a preheating section, a heating section and a slow cooling section from an inlet to an outlet. Hearth 2 is enclosed by diapire, two lateral walls, top cap, the diapire comprises the cotton layer of lower ceramic fiber board layer, the cotton layer of end heat preservation, goes up ceramic fiber board layer, the firebrick layer at the end that from the bottom up set gradually, the lateral wall comprises the side firebrick layer, the cotton layer of side heat preservation, the rock wool sandwich plate layer that set gradually from inside to outside, the top cap comprises steel frame and the ceramic fiber layer of setting in steel frame. Therefore, the furnace body 1 can realize good high temperature resistance and heat preservation on the premise of ensuring the strength.
The furnace body 1 is internally provided with a heating device 3 and a temperature control device, wherein the heating device 3 comprises a ceramic tube 32 and a resistance wire 31 arranged in the ceramic tube 32. The heating devices 3 are uniformly distributed at the bottom and the top of the hearth 2, a plurality of grooves 12 are formed in the bottom of the hearth 2 above the bottom refractory brick layer, and one ceramic tube 32 is placed in each groove 12. At the top of the furnace 2, a plurality of heating devices 3 are also mounted below the steel frame. The temperature control device comprises a controller and a plurality of thermocouples arranged in the hearth or the muffle liner at intervals, the thermocouples are connected with the controller to send temperature signals to the controller, and the controller is connected with the resistance wires to control the current passing through each resistance wire. Therefore, each thermocouple forms a temperature monitoring point, specifically, the preheating section and the slow cooling section are respectively provided with one temperature monitoring point, the heating section is provided with n monitoring points, the temperature is controlled accurately by the thermocouple, the temperature control precision is +/-2 ℃, the thermocouple is preferably arranged at the top of a hearth of the brazing furnace, a heating system can be well controlled by a control system, and different brazing process requirements are met.
Be provided with in the furnace 2 and extend and both ends all set up open-ended muffle courage 5 along length direction, preferably the bottom of furnace 2 is provided with corundum mullite backup pad 9, muffle courage 5 sets up on corundum mullite backup pad 9. The muffle container 5 consists of a stainless steel container shell 51 and a stainless steel reinforcing rib 52. The stainless steel liner shell 51 is formed by bending and splicing 310 stainless steel plates, in order to enhance the high-temperature strength and creep resistance of the muffle, the periphery of the stainless steel liner shell is protected by stainless steel reinforcing ribs 52, and the stainless steel reinforcing ribs 52 are also formed by bending 310 stainless steel tubes or steel plates and are welded on the outer side of the stainless steel liner shell 51.
The inner bottom of the muffle container 5 is provided with a graphite slide way 6 along the length direction, the graphite slide way 6 is composed of a bottom plate 61 and side plates 62 vertically arranged on two sides of the bottom plate 61, and the cross section of the graphite slide way 6 is U-shaped, so that the guide effect can be achieved, and articles in the slide way can be prevented from sliding out from the side part. The graphite slideway 6 is internally provided with a plurality of corundum-mullite push plates 7, the corundum-mullite push plates 7 are used for placing workpieces 10 to be brazed, and the corundum-mullite push plates 7 bear the workpieces 10 to slide in the graphite slideway 6 along the length direction. The graphite slide way 6 is used for guiding the sliding of the corundum-mullite push plate 7 and has the functions of heat transfer and lubrication. The workpiece 10 is placed on a corundum-mullite push plate 7. The corundum-mullite push plate 7 is formed by splicing according to the size of a hearth, so that the rigid impact of a heavy workpiece during placement is avoided, and the service life of the heavy workpiece is greatly prolonged.
The furnace body 1 is provided with a protective atmosphere input port 4 communicated to the hearth 2 so as to adopt continuous atmosphere for protection during brazing. The protective gas is ammonia decomposition gas (75% H2+25N2), the decomposition environment is one atmosphere, and the temperature is 750-850 ℃. The protective gas has strong reducibility, and can ensure that the atmosphere in the furnace has sufficient reducibility and strength. And a gas control valve can be arranged on a pipeline connected with the protective atmosphere input port to control the flow of the gas of the ammonia decomposition gas entering the hearth. The furnace body 1 is provided with movable cover plates at the inlet and the outlet of the hearth 2 respectively, the movable cover plates are used for reducing the overflow of protective atmosphere, and the arrangement of the movable cover plates also ensures the passing property of the corundum-mullite push plate 7 when sliding in or out from the graphite slide way 6.
The furnace body 1 is provided with a feeding push plate mechanism 8 for pushing a corundum-mullite push plate 7 to slide in a graphite slide way 6 along the length direction at the inlet of the hearth 2, and a trolley placing position for placing a moving trolley 9 is arranged between the push plate end of the feeding push plate mechanism 8 and the inlet of the hearth 2. The feeding push plate mechanism 8 is a hydraulic cylinder pushing mechanism, a moving trolley 9 is simply fixed at an inlet and an outlet of the hearth 2 respectively, workpieces on the moving trolley are pushed into the preheating section through the hydraulic cylinder pushing mechanism, and the specific working flow of the moving trolley is as follows: firstly, placing a workpiece to be processed on a corundum-mullite push plate of a moving trolley at an inlet of a hearth; when feeding, the feeding push plate mechanism 8 pushes the corundum-mullite push plate, the corundum-mullite push plate and the workpiece are integrally sent into the graphite slide way 6 in the hearth 2, the corundum-mullite push plates in the graphite slide way 6 sequentially move backwards, and the last group of corundum-mullite push plates and the workpiece at the outlet of the hearth are transferred to the moving trolley at the outlet of the hearth; moving the movable trolley at the outlet of the hearth, and taking down the brazed workpiece and putting the brazed workpiece into the heat insulation box; fourthly, the moving trolley at the inlet of the hearth is pushed to the outlet of the hearth.
In a more preferred embodiment, a cooling water path is provided outside the muffle 5 of the slow cooling section, and the cooling water path can cool the muffle 5 of the slow cooling section, thereby increasing the speed of temperature reduction and further improving the efficiency of brazing. The cooling water route is around the periphery of muffle 5, the cooling water route is followed the length and the width direction extension of muffle 5 are arranged, and the cooling water route entry sets up the one end that muffle 5 is close to the export of furnace 2, and the export setting is in the other end of muffle 5, like this, because the cooling water route entry is in the outlet side of muffle 5, can make the temperature distribution of muffle 5 reduce from the entry to the export gradually like this, realize better slow cooling effect, improve brazed quality. The stainless steel reinforcing ribs 52 are stainless steel pipes, and the cooling water path is formed by the inner cavity of the stainless steel pipes. The cooling water path is designed on the reinforcing rib of the muffle liner cooling section, so that the structure can be simplified, and the cooling efficiency is improved.
The brazing furnace for the large-scale component in the embodiment of the utility model adopts the linear tunnel type hearth and the high-temperature resistant graphite slide way, and the corundum-mullite push plate carries a large and heavy workpiece to slide on the graphite slide way, so that the phenomenon of push plate clamping stagnation caused by inconsistent high-temperature thermal deformation is not easy to occur; in addition, the pushing push plate adopts a small-block splicing structure, so that the impact of an upper workpiece and a lower workpiece can be greatly buffered, the service life is prolonged, and the manufacturing cost and the maintenance cost are reduced; in addition, the corundum-mullite push plate is conveyed to the inlet from the outlet of the hearth through the movable trolley, and is pushed through the feeding push plate mechanism, so that continuous production is realized, and the efficiency is high. The utility model discloses can satisfy the big and heavy work piece of size needs of brazing of atmosphere protection in succession to can reduce production and maintenance cost.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore should not be construed as limiting the scope of the invention.
In conclusion, although the present invention has been described with reference to the preferred embodiments, it should be noted that, although various changes and modifications can be made by those skilled in the art, unless such changes and modifications depart from the scope of the present invention, they should be construed as being included therein.
Claims (10)
1. The brazing furnace for the large-scale component is characterized by comprising a furnace body (1), a linear tunnel type hearth (2) is formed inside the furnace body (1), a heating device (3) and a temperature control device are arranged in the furnace body (1), a protective atmosphere input port (4) communicated with the hearth (2) is arranged on the furnace body (1), movable cover plates are respectively arranged at an inlet and an outlet of the hearth (2) of the furnace body (1), a muffle liner (5) extending along the length direction and provided with openings at two ends is arranged in the hearth (2), a graphite slide way (6) is arranged at the inner bottom of the muffle liner (5) along the length direction, a plurality of corundum-mullite push plates (7) are arranged in the graphite slide way (6), a feeding mechanism (8) for pushing the corundum-mullite push plates (7) to slide in the graphite slide way (6) is arranged at an inlet of the furnace body (1) of the hearth (2), and a moving trolley placing position is arranged between the push plate end of the feeding push plate mechanism (8) and the inlet of the hearth (2).
2. The brazing furnace for large components according to claim 1, wherein the heating device (3) comprises a plurality of resistance wires (31) arranged at the top and the bottom of the hearth (2), the temperature control device comprises a controller and a plurality of thermocouples arranged at intervals in the hearth (2) or the muffle (5), the thermocouples are connected with the controller to send temperature signals to the controller, and the controller is connected with the resistance wires (31) to control the current magnitude passing through each resistance wire (31).
3. Brazing furnace for large components according to claim 2, wherein the furnace body (1) is provided with a groove (12) at the bottom of the hearth (2), the heating means (3) comprise ceramic tubes (32), the resistance wires (31) are mounted inside the ceramic tubes (32), and the ceramic tubes (32) are provided in the groove (12).
4. The brazing furnace for the large-scale component according to claim 1, wherein the muffle furnace (5) is composed of a stainless steel furnace shell (51) and a stainless steel reinforcing rib (52) arranged on the outer side of the stainless steel furnace shell (51), the stainless steel furnace shell (51) is formed by bending and splicing stainless steel plates, and the stainless steel reinforcing rib (52) is welded on the outer side of the stainless steel furnace shell (51).
5. The brazing furnace for the large-scale component according to claim 4, wherein the hearth (2) comprises a preheating section, a heating section and a slow cooling section from an inlet to an outlet, and a cooling water path is arranged on the outer side of a muffle furnace (5) of the slow cooling section.
6. Brazing furnace for large components according to claim 5, wherein the cooling water path surrounds the periphery of the muffle (5).
7. The brazing furnace for the large-sized components according to claim 6, wherein the cooling water path extends along the length direction and the width direction of the muffle furnace (5), the inlet of the cooling water path is arranged at one end of the muffle furnace (5) close to the outlet of the hearth (2), and the outlet is arranged at the other end of the muffle furnace (5).
8. Brazing furnace for large components according to claim 7, wherein the stainless steel reinforcing ribs (52) are stainless steel tubes and the cooling water path is formed by the inner cavity of the stainless steel tubes.
9. Brazing furnace for large components according to any one of claims 1 to 7, wherein the graphite slide (6) is composed of a bottom plate (61) and side plates (62) erected on both sides of the bottom plate (61).
10. Brazing furnace for large components according to any one of claims 1 to 7, the bottom of the hearth (2) being provided with a corundum-mullite support plate (9), the muffle (5) being provided on the corundum-mullite support plate (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920669029.7U CN209830530U (en) | 2019-05-10 | 2019-05-10 | Brazing furnace for large-scale component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920669029.7U CN209830530U (en) | 2019-05-10 | 2019-05-10 | Brazing furnace for large-scale component |
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| Publication Number | Publication Date |
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| CN209830530U true CN209830530U (en) | 2019-12-24 |
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| CN201920669029.7U Expired - Fee Related CN209830530U (en) | 2019-05-10 | 2019-05-10 | Brazing furnace for large-scale component |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111843093A (en) * | 2020-06-04 | 2020-10-30 | 蚌埠市双环电子集团股份有限公司 | Chain belt type atmosphere brazing furnace for producing and processing soft magnetic materials |
| CN113528781A (en) * | 2021-01-25 | 2021-10-22 | 陈学森 | Crawler-type controllable atmosphere brazing heat treatment device |
| CN115011917A (en) * | 2022-05-18 | 2022-09-06 | 湖南工业职业技术学院 | Diamond particle surface modification method based on vacuum thermal evaporation |
-
2019
- 2019-05-10 CN CN201920669029.7U patent/CN209830530U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111843093A (en) * | 2020-06-04 | 2020-10-30 | 蚌埠市双环电子集团股份有限公司 | Chain belt type atmosphere brazing furnace for producing and processing soft magnetic materials |
| CN113528781A (en) * | 2021-01-25 | 2021-10-22 | 陈学森 | Crawler-type controllable atmosphere brazing heat treatment device |
| CN115011917A (en) * | 2022-05-18 | 2022-09-06 | 湖南工业职业技术学院 | Diamond particle surface modification method based on vacuum thermal evaporation |
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Granted publication date: 20191224 |