CN108356379B - Nickel brazing production line for plate heat exchanger - Google Patents
Nickel brazing production line for plate heat exchanger Download PDFInfo
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- CN108356379B CN108356379B CN201810330650.0A CN201810330650A CN108356379B CN 108356379 B CN108356379 B CN 108356379B CN 201810330650 A CN201810330650 A CN 201810330650A CN 108356379 B CN108356379 B CN 108356379B
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- rubber
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0012—Brazing heat exchangers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0607—Solder feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
- B23K3/0646—Solder baths
- B23K3/0692—Solder baths with intermediary means for bringing solder on workpiece, e.g. rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
The application discloses a plate heat exchanger nickel brazing production line which sequentially comprises a roll coater, a first tunnel oven, a spot coater, a second tunnel oven and a brazing furnace, wherein the equipment is connected through a conveying belt; the nickel brazing process of the plate heat exchanger comprises the following steps: rolling coating, primary drying, primary cooling, spot coating, assembling, secondary drying, secondary cooling, brazing and quality inspection. The application has the advantages of good welding strength, high efficiency, high yield and the like.
Description
Technical Field
The application relates to a production line of a plate heat exchanger, in particular to a nickel brazing production line of the plate heat exchanger.
Background
The plate heat exchanger is ideal equipment for liquid-liquid and liquid-vapor heat exchange, has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, long service life and the like, and is widely applied to the departments of metallurgy, mine, petroleum, chemical industry, electric power, medicine, food, chemical fiber, paper making, light spinning, ships, heat supply and the like. And it can be used for heating, cooling, evaporating, condensing, sterilizing, disinfecting, waste heat recovering and other conditions. The plate heat exchanger mainly has two major types of detachable and welding type, and compared with the welding type heat exchanger, the welding type heat exchanger has the advantages of high temperature bearing capacity, high pressure bearing capacity, high corrosion resistance and the like, so that the welding type heat exchanger has wider application range.
The welded heat exchanger can be divided into a half-welded heat exchanger, an all-welded heat exchanger, a plate-type heat exchanger and a brazing plate type heat exchanger. Because brazing has the advantages of low heating temperature, smooth joint, small change of structure and mechanical properties, accurate size of a workpiece and the like, the brazing plate type heat exchanger can be used as a condenser and an evaporator in the refrigeration industry and can be used as a cooler for alcohol fermentation and the like in the chemical industry.
The conventional brazing filler metal of the brazing sheet type heat exchanger is nickel foil, the brazing sheet can be brazed in a vacuum furnace only through procedures such as cutting, pre-assembly and pre-pressing, the procedures are complex, the degree of automation is low, and the yield is low. In order to solve the problems, paste solder (such as nickel-based solder paste) is selected and a corresponding automatic production line is adopted, so that complicated procedures in the production process can be effectively reduced, and the production efficiency and the yield are improved. However, the existing nickel brazing production line also has the problems that the heat exchange plates are easy to slip on the transmission belt, the positions of the hole rings of the heat exchange plates are not high in welding strength of the sealing bevel edges, the nickel paste of the rubber roller is remained and the like.
In view of the foregoing, it is necessary to provide a nickel brazing production line and a nickel brazing production process for a plate heat exchanger.
Disclosure of Invention
The application aims to solve the technical problems that a heat exchange plate is easy to slip on a transmission belt, the welding strength of a hole ring and a sealing bevel edge of the heat exchange plate is low, and nickel paste of a rubber roller is residual in a common plate heat exchanger nickel brazing production line.
The application solves the problems by adopting the following technical scheme: the nickel brazing production line of the plate heat exchanger sequentially comprises a roll coater, a first tunnel oven, a spot coater, a second tunnel oven and a brazing furnace, and the equipment is connected through a conveying belt.
The rolling coater consists of a rubber roller, a stainless steel roller hand-operated guide rod, a stainless steel roller sliding rail, a stainless steel roller sliding block, a nickel paste baffle, a rubber roller motor, a rubber roller base and a conveying belt, and has the functions of rolling a nickel paste layer on the surface of a heat exchange plate of the plate heat exchanger; the rubber roller core shaft is assembled on the fixed rubber roller base through a bearing, and the rubber roller core shaft and the output shaft of the rubber roller motor adopt gear speed change transmission; the stainless steel roller spindle is assembled on the rubber roller base through a bearing, the rubber roller base is assembled on the stainless steel roller sliding block in a bolt connection mode, and the stainless steel roller can slide on the stainless steel roller sliding rail through the stainless steel roller hand-operated guide rod, so that the gap between the stainless steel roller and the rubber roller can be adjusted; the nickel paste is loaded in the gap between the stainless steel roller and the rubber roller; the nickel paste baffle is connected to the rubber roller base through bolts.
Preferably, the transmission belt is composed of low elastic modulus rubber, medium elastic modulus rubber, high elastic modulus rubber and fiber layers, and the layers are bonded by adopting a vulcanization process;
preferably, the elastic modulus value ranges of the low, medium and high elastic modulus rubber of the conveyor belt are 2-10 MPa, 10-30 MPa and 30-100 MPa respectively;
preferably, the thickness of the low, medium and high elastic modulus rubber and the fiber layer of the transmission belt accounts for 8 to 12 percent, 18 to 22 percent, 28 to 32 percent and 38 to 42 percent of the whole thickness respectively;
preferably, the stainless steel roller is provided with a nickel paste storage groove at the circumferential edge, and the nickel paste remained on the rubber roller can be collected into the nickel paste storage groove by manually rotating the stainless steel roller;
preferably, the height dimension of the nickel paste storage groove of the stainless steel roller is 10-20 mm.
Preferably, in normal operation, the gap size range of the stainless steel roller and the rubber roller is 2-2.5 mm, the upper surface size range of the rubber roller and the heat exchange plate is 1-1.5 mm, the transmission speed of the transmission belt is the same as the linear speed value of the rubber roller, the directions are opposite, and the speed range is 0.2-0.25 m/s;
preferably, when the operation is stopped, the size of the gap between the stainless steel roller and the rubber roller ranges from 0.1 mm to 0.2mm.
The first tunnel oven consists of 5 sections of ovens with the length of 1m, and has the function of drying nickel paste roll-coated on the surface of the heat exchange plate.
Preferably, the temperatures of all sections of the first tunnel oven are sequentially set to 200 ℃, 210 ℃, 220 ℃, 210 ℃ and 200 ℃;
preferably, the belt transport speed in the tunnel oven is 0.3m/s.
The dispensing area of the dispensing machine is the central line of the sealing bevel edge of the heat exchange plate and the outer ring of the sealing angle hole of the heat exchange plate.
Preferably, the radius difference range between the outer ring of the spot-coating closed corner hole and the closed corner hole is 3-5 mm;
preferably, the speed range of the spot coating work of the spot coater is 0.3-0.4 m/s;
preferably, the aperture range of the nickel paste needle head of the spot coater is 0.5-0.6 mm;
preferably, the pressure of the nickel paste cylinder of the point coater is 5bar.
The second tunnel oven is provided with 2 sections of ovens with the same length, the total length is 2 meters, and the function of the second tunnel oven is to dry the assembled heat exchange plates.
Preferably, the temperature of each oven in the second tunnel oven is set to be 210 ℃ and 200 ℃ respectively;
preferably, the drying time of the heat exchange plates in the second tunnel oven is 0.5h.
Compared with the prior art, the application has the advantages that:
1. the conveying belt of the roll coater is composed of the rubber with low, medium and high elastic modulus and the fiber layer, and has gradient elastic property, so that the heat exchange plate is not easy to slip on the conveying belt, and the precision and the efficiency of the roll coating process can be greatly improved.
2. The stainless steel roller is provided with the nickel paste storage groove, and when the operation is stopped, the nickel paste residue of the rubber roller can be greatly reduced by reducing the gap between the stainless steel roller and the rubber roller and manually rotating the stainless steel roller hand-operated guide rod.
3. The spot coater can greatly improve the adhesion area of the nickel paste on the surface of the heat exchange plate and improve the brazing strength.
4. The first tunnel oven is composed of 5 sections of ovens, and a certain temperature gradient is set, so that the nickel paste on the surface of the heat exchange plate is more favorable for drying, and the yield is improved.
5. The second tunnel oven is composed of 2 sections of ovens, and a certain temperature gradient is set, so that the moisture in the assembled heat exchange plates can be removed more easily, and the yield is improved.
6. The nickel brazing process of the middle plate type heat exchanger can enable the design pressure of the product to be improved from 1MPa to 3MPa, and the application range is wider.
7. The nickel brazing process of the plate heat exchanger can improve the yield of products from 60% to 98%, and greatly reduces the production cost.
Drawings
Fig. 1 is a schematic view of a production line of the application, wherein 1 is a roll coater, 2 is a first tunnel oven, 3 is a spot coater, 4 is a second tunnel oven, and 5 is a brazing furnace.
Fig. 2 is a schematic structural diagram of a roll coater according to the present application, wherein 1.1 is a rubber roller, 1.2 is a stainless steel roller, 1.3 is a stainless steel roller hand-operated guide rod, 1.4 is a stainless steel roller sliding rail, 1.5 is a stainless steel roller sliding block, 1.6 is a nickel paste baffle, 1.7 is a rubber roller motor, 1.8 is a rubber roller base, and 1.9 is a conveyor belt.
FIG. 3 is a schematic view of a nickel paste stop according to the present application.
Fig. 4 is a schematic diagram of the working principle of the roller in the application, wherein 1.10 is nickel paste.
Fig. 5 is a schematic view of the structure of the conveyor belt of the present application, wherein 1.9.1 is a low elastic modulus rubber, 1.9.2 is a medium elastic modulus rubber, 1.9.3 is a high elastic modulus rubber, 1.9.4 is a fiber layer.
Fig. 6 is a schematic view of a stainless steel roller structure according to the present application.
Fig. 7 is a schematic illustration of the spot coating position of a heat exchanger plate in the present application.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The application provides a nickel brazing production line of a plate heat exchanger, which adopts the following specific technical scheme: the plate heat exchanger nickel brazing production line sequentially comprises a roll coater 1, a first tunnel oven 2, a spot coater 3, a second tunnel oven 4 and a brazing furnace 5, and the equipment is connected through a conveying belt, as shown in figure 1.
The roll coater consists of a rubber roller 1.1, a stainless steel roller 1.2, a stainless steel roller hand-operated guide rod 1.3, a stainless steel roller slide rail 1.4, a stainless steel roller slide block 1.5, a nickel paste baffle 1.6, a rubber roller motor 1.7, a rubber roller base 1.8 and a conveyor belt 1.9, and has the function of roll coating a nickel paste layer on the surface of a heat exchange plate of the plate heat exchanger as shown in figure 2. The rubber roller 1.1 mandrel is assembled on a fixed rubber roller base 1.8 through a bearing, and the rubber roller 1.1 mandrel and the output shaft of a rubber roller motor 1.7 adopt gear speed change transmission; the stainless steel roller 1.2 mandrel is assembled on the rubber roller base 1.8 through a bearing, the rubber roller base 1.8 is assembled on the stainless steel roller sliding block 1.5 in a bolt connection mode, the stainless steel roller 1.2 can slide on the stainless steel roller sliding rail 1.4 through the stainless steel roller hand-operated guide rod 1.3, and therefore the gap between the stainless steel roller and the rubber roller can be adjusted; the nickel paste 1.10 is loaded in the gap between the stainless steel roller 1.2 and the rubber roller 1.1 as shown in fig. 3; the nickel paste baffle 1.6 is connected to the rubber roller base through bolts, and can effectively prevent the loss of nickel paste (1.10) at the ends of the stainless steel roller 1.2 and the rubber roller 1.1. In normal operation, the gap size a between the stainless steel roller 1.2 and the rubber roller 1.1 ranges from 2mm to 2.5mm, and the gap size b between the rubber roller 1.1 and the upper surface of the heat exchange plate ranges from 1 mm to 1.5mm, as shown in fig. 4; the conveying speed of the conveying belt 1.9 is the same as the linear speed value of the rubber roller 1.1 and opposite in direction, and the speed range is 0.2-0.25 m/s; when the operation is stopped, the gap size a between the stainless steel roller 1.2 and the rubber roller 1.1 is in the range of 0.1-0.2 mm. The transmission belt 1.9 is composed of low elastic modulus rubber 1.9.1, medium elastic modulus rubber 1.9.2, high elastic modulus rubber 1.9.3 and a fiber layer 1.9.4, wherein the layers are bonded by adopting a vulcanization process, so that the heat exchange plates can be effectively prevented from slipping on the transmission belt; the elastic modulus value ranges of the low, medium and high elastic modulus rubber of the conveying belt are 2-10 MPa, 10-30 MPa and 30-100 MPa respectively; the thickness of the rubber and fiber layers with low, medium and high elastic modulus of the transmission belt accounts for 8-12%, 18-22%, 28-32% and 38-42% of the whole thickness. The stainless steel roller 1.2 is provided with a nickel paste storage groove at the circumferential edge, as shown in fig. 6, when the operation is stopped, the nickel paste remained on the rubber roller 1.1 is collected into the nickel paste storage groove by manually rotating the stainless steel roller 1.2; the height dimension c of the nickel paste storage groove is 10-20 mm.
The tunnel oven No. I consists of 5 sections of ovens with equal length, and the total length is 5 meters. The temperatures of all sections of ovens in the first tunnel oven are respectively set to 200 ℃, 210 ℃, 220 ℃, 210 ℃ and 200 ℃; the conveying speed of the mesh belt in the tunnel oven was 0.3m/s.
The nickel paste spray head in the dispensing machine can move along with the guide rail and the air cylinder in any space range, so that the nickel paste coverage rate of the heat exchange plates can be further improved, and the yield is improved. The heat exchange plate is generally provided with a liquid inlet corner hole (S1), a liquid outlet corner hole (S2), a first closed corner hole (S3) and a second closed corner hole (S4), as shown in fig. 7, the liquid inlet corner hole and the liquid outlet corner hole (S1 and S2) can be uniformly attached with a layer of nickel paste through a roll coating process, the first closed corner hole and the second closed corner hole are difficult to be attached with nickel paste through a roll coating process, a circle of nickel paste is needed to be coated on the outer circle of the closed corner hole through a dispensing machine, and the radius difference size range between a circle of the nickel paste coated on the spot and the closed corner hole is 3-5 mm, as shown in fig. 7. The sealing bevel edge of the heat exchange plate is difficult to be adhered with nickel paste through a roll coating process, and therefore a circle of nickel paste is needed to be coated at the center line position of the sealing bevel edge through a dispensing machine, as shown in fig. 7. The speed range of the spot coating machine spot coating work is 0.3-0.4 m/s; the aperture size d of the nickel paste needle head of the spot coater is in the range of 0.5-0.6 mm; the pressure of the nickel paste cylinder of the point coater is 5bar.
The second tunnel oven has 2 sections of ovens with the same length and the total length of 2 meters, and has the function of fully discharging the moisture in the nickel paste in the heat exchange plates and improving the yield. The temperature of each oven in the second tunnel oven is respectively set to 210 ℃ and 200 ℃, and the drying time is 0.5h.
The application also provides a nickel brazing process of the plate heat exchanger, which comprises the following specific steps:
(1) And (3) roll coating: the upper surface sizes of the rubber roller and the heat exchange plate in the roll coater are adjusted to be 1-1.5 mm, the clearance sizes of the rubber roller and the stainless steel roller are adjusted to be 2-2.5 mm, and the linear speed of the rubber roller and the linear speed of the conveying belt are both set to be 0.2-0.25 m/s;
(2) Primary drying: transmitting the heat exchange plates subjected to the roll coating to a first tunnel oven, wherein the temperatures of all sections of the first tunnel oven are respectively set to 200 ℃, 210 ℃, 220 ℃, 210 ℃ and 200 ℃, and the transmission speed of a mesh belt in the tunnel oven is set to 0.3m/s;
(3) Primary cooling: cooling the dried heat exchange plates to normal temperature;
(4) And (3) spot coating: a circle of nickel paste is coated on the position of the central line of the sealing bevel edge and the outer ring of the sealing bevel edge, which is not attached with the nickel paste, of the heat exchange plate, the radius difference between the circle of the nickel paste coated and the sealing bevel edge is set to be 3-5 mm, the feeding speed of the nickel paste coated by the point coating machine is set to be 0.3-0.4 m/s, the aperture of the nickel paste needle head of the point coating machine is set to be 0.5-0.6 mm, and the pressure of the nickel paste needle cylinder of the point coating machine is set to be 5bar;
(5) And (3) assembling: assembling the spot-coated heat exchange plates according to the requirements;
(6) And (3) secondary drying: transmitting the assembled heat exchange plates to a second tunnel oven, wherein the temperatures of all sections of the second tunnel oven are respectively set to 210 ℃ and 200 ℃, and the drying time is 0.5h;
(7) And (5) secondary cooling: the assembled heat exchange plates are dried for the second time and then cooled to normal temperature;
(8) Brazing: putting the assembled heat exchange plates into a brazing furnace, wherein the furnace temperature is set to 1100-1150 ℃ and the brazing time is 8-10 hours;
(9) Quality inspection: the quality inspection of the bulk fluid dispenser is performed according to national or industry or enterprise standards. The quality inspection links are interspersed in each manufacturing procedure.
The foregoing is only illustrative of the preferred embodiments of the application, and it will be appreciated by those skilled in the art that various changes in the features and embodiments may be made and equivalents may be substituted without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. The utility model provides a plate heat exchanger nickel brazing production line which characterized in that: the plate heat exchanger nickel brazing production line sequentially comprises a roll coater, a first tunnel oven, a spot coater, a second tunnel oven and a brazing furnace, and the equipment is connected through a conveying belt; the rolling coater consists of a rubber roller, a stainless steel roller hand-operated guide rod, a stainless steel roller sliding rail, a stainless steel roller sliding block, a nickel paste baffle, a rubber roller motor, a rubber roller base and a conveying belt, and has the functions of rolling a nickel paste layer on the surface of a heat exchange plate of the plate heat exchanger; the rubber roller core shaft is assembled on the fixed rubber roller base through a bearing, and the rubber roller core shaft and the output shaft of the rubber roller motor adopt gear speed change transmission; the stainless steel roller spindle is assembled on the rubber roller base through a bearing, the rubber roller base is assembled on the stainless steel roller sliding block in a bolt connection mode, and the stainless steel roller can slide on the stainless steel roller sliding rail through the stainless steel roller hand-operated guide rod, so that the gap between the stainless steel roller and the rubber roller can be adjusted; the nickel paste is loaded in the gap between the stainless steel roller and the rubber roller; the nickel paste baffle is connected to the rubber roller base through bolts;
the nickel paste storage groove is formed in the circumferential edge of the stainless steel roller, and residual nickel paste on the rubber roller can be collected into the nickel paste storage groove by manually rotating the stainless steel roller; the height dimension of the nickel paste storage groove is 10-20 mm.
2. A plate heat exchanger nickel brazing line according to claim 1, wherein: the transmission belt consists of a low elastic modulus rubber, a medium elastic modulus rubber, a high elastic modulus rubber and a fiber layer, wherein the layers are bonded by adopting a vulcanization process; the elastic modulus value ranges of the low, medium and high elastic modulus rubber of the conveying belt are 2-10 MPa, 10-30 MPa and 30-100 MPa respectively; the thickness of the rubber and fiber layers with low, medium and high elastic moduli of the transmission belt accounts for 8 to 12 percent, 18 to 22 percent, 28 to 32 percent and 38 to 42 percent of the whole thickness.
3. A plate heat exchanger nickel brazing line according to claim 1, wherein: in normal operation, the gap size range of the stainless steel roller and the rubber roller is 2-2.5 mm, the upper surface size range of the rubber roller and the heat exchange plate is 1-1.5 mm, the transmission speed of the transmission belt is the same as the linear speed value of the rubber roller, the directions are opposite, and the speed size range is 0.2-0.25 m/s; when the operation is stopped, the size range of the gap between the stainless steel roller and the rubber roller is 0.1-0.2 mm.
4. A plate heat exchanger nickel brazing line according to claim 1, wherein: the first tunnel oven consists of 5 ovens with the length of 1m, and the temperatures of the ovens are sequentially set to 200 ℃, 210 ℃, 220 ℃, 210 ℃ and 200 ℃; the conveying speed of the conveying belt in the first tunnel oven is 0.3m/s.
5. A plate heat exchanger nickel brazing line according to claim 1, wherein: the spot coating area of the spot coating machine is the center line of the sealing bevel edge of the heat exchange plate and the outer ring of the sealing corner hole of the heat exchange plate; the radius difference range between the outer ring of the spot-coating closed angle hole and the closed angle hole is 3-5 mm; the speed range of the spot coating machine spot coating work is 0.3-0.4 m/s; the aperture range of the nickel paste needle head of the spot coater is 0.5-0.6 mm; the pressure of the nickel paste cylinder of the point coater is 5bar.
6. A plate heat exchanger nickel brazing line according to claim 1, wherein: the second tunnel oven is provided with 2 sections of ovens with the same length, and the total length is 2 meters; the temperature of each oven in the second tunnel oven is respectively set to 210 ℃ and 200 ℃, and the drying time is 0.5h.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810265987 | 2018-03-28 | ||
| CN2018102659878 | 2018-03-28 |
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| CN108356379A CN108356379A (en) | 2018-08-03 |
| CN108356379B true CN108356379B (en) | 2023-08-22 |
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| CN201810330650.0A Active CN108356379B (en) | 2018-03-28 | 2018-04-13 | Nickel brazing production line for plate heat exchanger |
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| CN108515250B (en) * | 2018-03-28 | 2020-05-22 | 江苏宝得换热设备股份有限公司 | Nickel brazing production process for plate heat exchanger |
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