CN107931768B

CN107931768B - Vacuum welding furnace and welding process

Info

Publication number: CN107931768B
Application number: CN201711480242.5A
Authority: CN
Inventors: 李向东
Original assignee: Shandong Caiju Electronic Technology Co ltd
Current assignee: Shandong Caiju Electronic Technology Co ltd
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2023-05-16
Anticipated expiration: 2037-12-29
Also published as: CN107931768A; DE202018006535U1; DE112018006635T5; JP7127132B2; JP2021508602A; WO2019128068A1

Abstract

A vacuum welding furnace and a welding process belong to the technical field of vacuum welding. The method is characterized in that: one side of the welding table (20) close to the feeding end is a heating area, one side of the welding table (20) close to the discharging end is a cooling area, a negative pressure pumping module (9) is arranged on the upper side of one end of the heating area close to the cooling area, the negative pressure pumping module (9) is installed on the furnace cover (4) in a lifting mode, a closed negative pressure cavity is formed by surrounding the bottom of the negative pressure pumping module (9) and the heating area, and a protective gas inlet pipe is arranged on the welding chamber (18) or the furnace cover (4). The heating zone of the vacuum welding furnace can heat the material sheets, so that the material sheets can be welded in the negative pressure cavity rapidly, the material sheets and oxygen can be prevented from reacting in the heating process by the protective gas, the material sheets can be cooled by the cooling zone, and the material sheets are prevented from being oxidized; the welding process reduces the welding time, improves the welding speed, ensures thorough cooling in the cooling area, and avoids deformation of the material sheet caused by too fast cooling.

Description

Vacuum welding furnace and welding process

Technical Field

A vacuum welding furnace and a welding process belong to the technical field of vacuum welding.

Background

When producing electronic components such as diodes, triodes, thyristors or bridges, chips need to be welded between an upper material sheet and a lower material sheet, and the process is called as lamination. The specific working process of the lamination is as follows: firstly, the upper side of a blanking piece is required to be coated with solder paste, a chip is placed at a specific position of the blanking piece, then the upper piece with the solder paste coated on the lower side is stacked on the upper side of the blanking piece, a top cover of a welding die is covered on a bottom plate of the welding die, and finally the welding die is sent into a welding furnace for welding. Welding of the webs needs to be performed in a vacuum oven.

The Chinese patent application No. 201420820418.2 discloses a continuous vacuum welding furnace, which has the following technical problems in the use process:

(1) The machine is only provided with a heating zone matched with the vacuum treatment device, the solder paste is melted and has a welding effect by heating the material sheet to a certain temperature, the heating time of the material sheet is long due to the fact that the heating zone is arranged on the upper cover, the material sheet is heated by radiation, the heat transfer efficiency is low, the heating time of the material sheet is further increased, and the welding efficiency is low;

(2) In order to facilitate the conveying of the tablet by the transmission mechanism, the two ends of the tablet need to extend out of the bearing table, the tablet is supported and conveyed by the transmission mechanism through the extending parts at the two ends of the tablet, and the extending parts at the two ends of the tablet can be bent downwards due to the fact that the tablet is softer after being heated, so that the positions of chips at the two ends of the tablet cannot be aligned with the contacts of the tablet, and a large number of unqualified products are caused;

(3) The temperature of the welded material sheet is too high, the cooling speed is low, the material sheet is easy to oxidize after being moved out of the vacuum treatment device, and the temperature of the material sheet moved out of the machine table is still too high, so that workers cannot directly treat the material sheet.

Disclosure of Invention

The invention aims to solve the technical problems that: overcomes the defects of the prior art, and provides a vacuum welding furnace and a welding process which are used for heating and welding the material sheets in the material sheet conveying process, have high welding speed and avoid oxidation of the material sheets.

The technical scheme adopted for solving the technical problems is as follows: this vacuum welding stove, including welding room, bell and handling mechanism, the bell lid closes in welding room upside to form the welding chamber between welding room and bell, welding room lower part is equipped with welding table, its characterized in that: one side of the welding table, which is close to the feeding end, is a heating area, one side of the welding table, which is close to the discharging end, is a cooling area, a negative pressure pumping module is arranged on the upper side of one end of the heating area, which is close to the cooling area, the negative pressure pumping module is installed on the furnace cover in a lifting manner, a closed negative pressure cavity is formed by surrounding the bottom of the negative pressure pumping module and the heating area, and a protective gas inlet pipe is arranged on the welding chamber or the furnace cover.

Preferably, the welding table comprises a plurality of heating plates and a plurality of cooling plates, the heating plates are spliced into a heating area, and the cooling plates are spliced into a cooling area.

Preferably, electric heating pipes are symmetrically arranged on two sides of each heating plate, a sensor mounting hole is formed in the middle of each heating plate, the sensor mounting holes are blind holes formed between the two electric heating pipes, and a temperature sensor is arranged in each sensor mounting hole.

Preferably, water inlet channels are symmetrically arranged on two sides of each cooling plate, and at least one end of each cooling plate is provided with a water drainage channel communicated with the two water inlet channels.

Preferably, the lower side of the welding chamber is provided with a liquid collecting cover, two sides of the bottom of the liquid collecting cover are gradually inclined downwards from the side part to the middle part, and a liquid collecting cover liquid outlet pipe is arranged at the bottom of the liquid collecting cover.

Preferably, the shielding gas inlet pipe is a main nitrogen inlet pipe, the main nitrogen inlet pipes are arranged at two ends of the furnace cover, the auxiliary nitrogen inlet pipes are symmetrically arranged at two sides of the middle of the furnace cover, and the auxiliary nitrogen inlet pipes are communicated with the welding chamber.

Preferably, the lower part bilateral symmetry of bell be provided with the air inlet board, the upper portion of air inlet board is equipped with the open air inlet in upside to enclose into the inlet chamber with the bell, the interval is provided with a plurality of fumaroles with air inlet and welding chamber intercommunication on the air inlet board, vice nitrogen gas intake pipe and air inlet intercommunication.

Preferably, the handling mechanism include the handling pole and set up elevating system, translation mechanism and the mechanism that opens and shuts in the welding chamber downside, the handling pole symmetry is provided with two, and the middle part setting of handling pole is in the welding chamber, the mechanism that opens and shuts links to each other with two handling poles simultaneously and drives it and open and shut, translation mechanism links to each other and drives it along being close to or keep away from the direction of discharge end with opening and shutting the mechanism and remove, elevating system links to each other with translation mechanism and drives it and go up and down, all be equipped with a plurality of bearing portions on every handling pole, the welding table both ends are equipped with a plurality of mouths of stepping down, mouths of stepping down and bearing portion one-to-one.

Preferably, both ends of the welding chamber are sealed through end covers, carrying openings are symmetrically formed in both sides of each end cover, carrying rods penetrate through the carrying openings and are connected with the opening and closing mechanism, and the bottoms of the end covers are arranged at intervals with the welding table.

Preferably, baffle mounting grooves are symmetrically formed in two ends of each end cover, a plane where the baffle mounting grooves are located is perpendicular to the central line of the carrying rod, a baffle is slidably mounted in the baffle mounting grooves, the baffle is slidably and sealingly connected with the carrying rod, and the baffle is matched with the end cover on the corresponding side to seal the end part of the welding chamber.

Preferably, each end cover is symmetrically provided with baffle mounting grooves on two sides, a plane where the baffle mounting grooves are located is perpendicular to the central line of the carrying rod, a baffle is slidably mounted in the baffle mounting grooves, the baffle is slidably and sealingly connected with the carrying rod, and the baffle is matched with the end cover on the corresponding side to seal the end part of the welding chamber.

Preferably, the opening and closing mechanism comprises an opening and closing guide plate and an opening and closing power module, wherein the opening and closing guide plate is horizontally arranged, the opening and closing guide plate is arranged between two carrying rods, both sides of the opening and closing guide plate are respectively provided with an opening and closing guide part which is gradually inclined inwards along the direction close to the discharge end, the lower side of each carrying rod is respectively provided with an opening and closing guide wheel which is attached to the opening and closing guide part, an opening and closing spring in a stretching state is arranged between the two carrying rods, and the opening and closing power module is connected with the opening and closing guide plate and drives the opening and closing guide plate to move along the direction close to or far away from the discharge end.

Preferably, the lifting mechanism comprises a lifting guide block and a lifting air cylinder, wherein the upper side of the lifting guide block is provided with a lifting guide part which is gradually downward inclined along the direction close to the discharge end, the lower side of the translation mechanism is provided with a lifting guide wheel attached to the lifting guide part, and a piston rod of the lifting air cylinder is connected with the lifting guide block and pushes the lifting guide block to move along the direction close to or far away from the discharge end.

Preferably, the negative pressure pumping module comprises a sealing plate and a negative pressure pumping lifting cylinder, wherein the sealing plate is arranged on the upper side of the heating zone and is parallel to the heating zone, a closed negative pressure cavity is formed by surrounding the bottom of the sealing plate and the heating zone, and the negative pressure cavity is connected with a negative pressure pumping pipe.

Preferably, the sealing plate is arranged at the lower side of the furnace cover, the negative pressure pumping lifting cylinder is arranged at the upper side of the furnace cover, a piston rod of the negative pressure pumping lifting cylinder is connected with the sealing plate through a connecting pipe, and the connecting pipe is used for communicating the negative pressure cavity with the negative pressure pumping pipe.

Preferably, the welding device further comprises a purification module, wherein the air inlet end and the air outlet end of the purification module are communicated with the welding chamber.

Preferably, the purification module comprises a purification box, a coil pipe and a filter screen, wherein the coil pipe and the filter screen are arranged in the purification box, the air inlet end and the air outlet end are respectively arranged on two sides of the purification box, the filter screen is close to the air outlet end and seals the air outlet end, circulating cooling liquid is filled in the coil pipe, and a fan is arranged between the air outlet end of the purification box and the welding chamber.

Preferably, the purification module further comprises fins arranged in the purification box.

The welding process of the vacuum welding furnace is characterized by comprising the following steps of: the method comprises the following steps:

1) The furnace cover seals the welding chamber, and the protective gas inlet pipe blows protective gas into the welding chamber;

2) The conveying mechanism conveys the material sheets into the negative pressure cavity piece by piece, and the heating area gradually heats the material sheets in the conveying process;

3) The conveying mechanism conveys the material sheets welded in the negative pressure cavity to the discharge end, and the cooling area gradually cools the material sheets.

Compared with the prior art, the invention has the following beneficial effects:

1. the heating zone of this vacuum welding furnace can heat the tablet to make the tablet can accomplish in the negative pressure chamber quick welding, be filled with the shielding gas in the welding chamber, thereby can avoid heating in-process tablet and oxygen to take place the reaction, the cooling zone can cool off the tablet, thereby make the tablet temperature who shifts out the welding chamber low, avoided the tablet promptly by oxidation, the tablet that just in time welds well is handled again, and can not appear because tablet temperature is too high and the variability leads to the tablet deformation in the handling in-process to tablet handling, lead to the problem that the disqualification rate risees, the tablet is direct to contact with heating zone or cooling zone, heating and cooling have been realized through the mode of heat conduction, compared with the heating mode that adopts the radiation, heating rate has been improved greatly, the temperature rise and the cooling that make the tablet can be quick, the consumption of energy has been reduced.

2. The heating area is spliced into to the polylith hot plate, and the cooling area is spliced into to the polylith cooling plate to can make the welding indoor hold polylith piece simultaneously, the heating area heats polylith tablet simultaneously, makes the tablet can reach welding temperature fast, has improved welding speed.

3. All be equipped with electric heating pipe and temperature sensor on every hot plate, make every hot plate realize independent temperature control to can progressively heat the tablet in the tablet handling, avoid the too fast material piece deformation that leads to of heating, still avoided the too fast solder paste that leads to of heating to melt and flow, lead to appearing the defective products.

4. Every cooling plate is last all to be provided with inlet channel and outlet channel, has realized progressively cooling to the tablet, avoids the cooling to lead to the solder paste after solidifying to appear the crackle too fast, leads to chip and tablet contact failure, appears the disqualified product, also can avoid the tablet to take place to warp.

5. The liquid collecting cover can discharge liquid formed by condensing the cooling area through a liquid outlet pipe of the liquid collecting cover.

6. The main nitrogen gas intake pipe is equipped with at the both ends of bell, and bell middle part bilateral symmetry is equipped with vice nitrogen gas intake pipe to can guarantee that nitrogen gas is full of the welding room fast, the preparation time before the welding is short, convenient to use.

7. The auxiliary nitrogen gas inlet pipe sprays nitrogen gas into the welding chamber uniformly through the air inlet plate, so that air in the welding chamber can be completely emptied, and the heated material sheet and oxygen are prevented from reacting.

8. The opening and closing mechanism drives the two carrying rods to open and close and is matched with the lifting mechanism, so that the bearing part stretches into the yielding port of the welding table, the two ends of the material sheet are used for supporting the material sheet, and the translation mechanism drives the material sheet to translate through the carrying rods, so that the translation work of the material sheet is completed.

9. The carrying rod extends out of the welding chamber through the carrying opening and is connected with the opening and closing mechanism, so that the carrying of the material sheet in the welding chamber is realized, the material sheet can be carried into the welding chamber, and the welded material sheet in the welding chamber is carried out of the welding chamber, and the moving in and moving out of the material sheet can be realized without opening the furnace cover in the welding process.

10. The baffle moves in the baffle mounting groove along with the movement of the carrying rod, so that the welding chamber can be timely sealed, the leakage of the shielding gas is avoided, the consumption of the shielding gas is reduced, and the welding cost is further reduced.

11. The opening and closing mechanism is connected with the carrying and mounting arm at the lower side of the welding chamber, so that the connection of the carrying rod is facilitated.

12. The power module that opens and shuts promotes the deflector that opens and shuts and remove, and the guide portion that opens and shuts of deflector that opens and shuts promotes two carrier bars through the leading wheel that opens and shuts and remove to opposite direction in step, and the spring that opens and shuts can make the leading wheel that opens and shuts compress tightly the guide portion that opens and shuts all the time, and then has realized that two carrier bars open and shut, makes things convenient for the transport of tablet, can also avoid the carrier bar to cause the hindrance to taking out the work of negative pressure module to the stroke of carrier bar is stable, can not cause the destruction to the end cover.

13. The lifting cylinder pushes the lifting guide block to translate, and the lifting guide part of the lifting guide block pushes the translation mechanism to lift through the lifting guide wheel, so that synchronous lifting of the two carrying rods is realized, stable lifting action of the carrying rods is ensured, the lifting stroke is determined, and the welding chamber is not damaged.

14. The sealing plate and the heating area are surrounded to form a negative pressure cavity, and the negative pressure pumping lifting cylinder can drive the sealing plate to lift, so that the material sheet can conveniently move in or out of the negative pressure cavity.

15. The negative pressure pumping lifting cylinder is connected with the sealing plate through the connecting pipe and drives the sealing plate to lift, and the negative pressure pumping pipe is communicated with the negative pressure cavity through the connecting pipe, so that the installation connection of the sealing plate is facilitated, and the negative pressure pumping of the negative pressure cavity is also facilitated.

16. The purification module can extract the shielding gas in the welding chamber and remove the welding oil vapor in the shielding gas, so that the phenomenon that the welding of the material sheets is influenced due to excessive welding oil vapor generated by heating the solder paste is avoided.

17. The coil pipe exchanges heat with the extracted shielding gas through the cooling liquid and reduces the temperature of the shielding gas, so that the welding oil is liquefied, and then the shielding gas is filtered through the filter screen, so that the welding oil is left on the filter screen, and the separation of the welding oil and the shielding gas is realized.

18. The fins can increase the heat exchange area of the cooling liquid and the shielding gas, so that the shielding gas is cooled down rapidly, and the welding oil in the shielding gas can be removed more thoroughly.

19. According to the welding process, the material sheets in the welding chamber are protected through the protective gas, the material sheets at high temperature are prevented from reacting with oxygen, the heating area can gradually heat the material sheets, the temperature of the material sheets reaches the welding temperature or is close to the welding temperature when the material sheets move into the negative pressure cavity, the welding can be rapidly completed in the welding time in the negative pressure cavity, the welding time is shortened, the welding speed is improved, the material sheets can be gradually cooled by the cooling area, the cooling is thorough, and deformation of the material sheets caused by too fast cooling can be avoided.

Drawings

Fig. 1 is a schematic perspective view of a vacuum welding furnace.

Fig. 2 is a schematic perspective view of the furnace cover.

Fig. 3 is a schematic view in front cross-section of the furnace lid.

Fig. 4 is a partial enlarged view at a in fig. 3.

Fig. 5 is a schematic front cross-sectional view of an intake plate.

Fig. 6 is a schematic perspective view of the vacuum welding furnace with the furnace cover removed.

Fig. 7 is a partial enlarged view at B in fig. 6.

Fig. 8 is a schematic perspective view of a welding station.

Fig. 9 is a right side view of the welding station.

Fig. 10 is a schematic top cross-sectional view of a heating plate.

Fig. 11 is a schematic top cross-sectional view of a cooling plate.

Fig. 12 is a schematic front cross-sectional view of a weld chamber mount.

Fig. 13 is a schematic front cross-sectional view of the mounting pin.

Fig. 14 is a schematic front view of the negative pressure pumping module.

Fig. 15 is a schematic perspective view of the conveyance mechanism.

Fig. 16 is a schematic front view of the conveyance mechanism.

Fig. 17 is a schematic perspective view of a welding oil purification module.

Fig. 18 is a schematic front cross-sectional view of a purification module.

In the figure: 1. frame 2, handling mechanism 3, furnace cover cylinder 4, furnace cover 5, main nitrogen intake pipe 6, guide cap 7, purge intake pipe 8, purge outlet pipe 9, negative pressure suction module 10, connecting arm 11, swing arm 12, mounting arm 13, connecting rod 14, furnace cover mounting plate 1401, mounting port 15, gas cap 16, sub nitrogen intake pipe 17, intake plate 1701, intake 1702, gas injection hole 18, welding chamber 19, discharge table 1901, discharge table relief port 20, welding table 21, feed table 2101, feed table relief port 22, mounting plate 23, adjusting spring 24, handling rod 25, sealing sleeve 26, end cap 2601, handling port 2602, baffle mounting groove 27, baffle 28, cooling plate 2801, cooling plate relief port 2802, intake passage 2803, drain passage 2804, cooling plate mounting hole 29 the water inlet pipe 30, the heating plate 3001, the heating plate relief port 3002, the electric heating tube mounting hole 3003, the sensor mounting hole 3004, the heating plate mounting hole 31, the electric heating tube 32, the temperature sensor 33, the liquid collecting cover 3301, the liquid collecting cover liquid outlet pipe 34, the negative pressure suction mounting frame 35, the negative pressure suction lifting cylinder 36, the sealing plate 37, the connecting pipe 38, the connecting plate 39, the mounting pin 3901, the threaded hole 40, the welding chamber mounting frame 4001, the fixing portion 4002, the stepped hole 41, the translation plate 42, the opening and closing mounting rod 43, the opening and closing guide plate 44, the opening and closing guide wheel 45, the transportation mounting arm 46, the transportation lifting cylinder 47, the lifting guide frame 48, the lifting guide block 49, the translation frame 50, the translation frame guide rail 51, the translation plate guide rail 52, the transportation mounting plate 53, the translation motor 54, the translation motor mounting frame 55, the carrying and moving frame 56, the opening and closing moving frame 57, the opening and closing motor mounting frame 58, the opening and closing motor 59, the purifying module 60, the oil supply tank 61, the purifying tank 62, the purifying tank air inlet pipe 63, the filter screen mounting tank 64, the filter screen 65, the fan 66, the welding oil collecting barrel 67, the coil pipe 68 and the fins.

Detailed Description

Fig. 1 to 18 are preferred embodiments of the present invention, and the present invention is further described with reference to fig. 1 to 18.

The utility model provides a vacuum welding stove, including welding chamber 18, bell 4 and transport mechanism 2, bell 4 covers in welding chamber 18 upside, and form the welding chamber between welding chamber 18 and bell 4, welding chamber 18 lower part is equipped with welding bench 20, one side that welding bench 20 is close to the feed end is the zone of heating, one side that welding bench 20 is close to the discharge end is the cooling zone, the zone of heating is close to the one end upside of cooling zone is provided with takes out negative pressure module 9, take out negative pressure module 9 liftable and install on bell 4, take out negative pressure module 9 bottom and the zone of heating enclose into inclosed negative pressure chamber, be provided with the shielding gas intake pipe on welding chamber 18 or the bell 4. The heating zone of this vacuum welding furnace can heat the tablet to make the tablet can accomplish in the negative pressure chamber quick welding, be filled with the shielding gas in the welding chamber 18, thereby can avoid heating in-process tablet and oxygen to take place the reaction, the cooling zone can cool off the tablet, thereby make the tablet temperature who shifts out the welding chamber 18 low, avoided the tablet to be oxidized promptly, the tablet that just in time welds well again is convenient to handle, and can not appear because the tablet deformation in the handling because the too high variability of tablet temperature leads to handling in the tablet handling process, lead to the problem that the disqualification rate risees, the tablet is direct to contact with heating zone or cooling zone, heating and cooling have been realized through the mode of heat conduction, compared with the heating mode that adopts the radiation, heating rate has been improved greatly, make the tablet intensification and cooling down that can be quick, the consumption of energy has been reduced.

The present invention will be further described with reference to specific embodiments, however, it will be appreciated by those skilled in the art that the detailed description herein with reference to the accompanying drawings is for better illustration, and that the invention is not necessarily limited to such embodiments, but rather is intended to cover various equivalent alternatives or modifications, as may be readily apparent to those skilled in the art.

Specific: as shown in fig. 1: the welding chamber 18 is a cuboid box with an open upper side, two ends of the welding chamber 18 are a feeding end and a discharging end respectively, the welding chamber 18 is arranged on the upper side of the frame 1, and the conveying mechanism 2 is arranged on the frame 1 below the welding chamber 18. The furnace cover 4 is installed on the upper side of the welding chamber 18 and closes the upper side of the welding chamber 18. The negative pressure pumping module 9 is arranged on the furnace cover 4, the lower end of the negative pressure pumping module 9 penetrates through the furnace cover 4 and then stretches into the welding chamber 18, and the negative pressure pumping module 9 is arranged between the heating area and the cooling area. The negative pressure suction module 9 may be provided in plural numbers so as to increase the welding speed, or may be provided in one.

The two ends of the frame 1 are symmetrically provided with connecting arms 10, the upper ends of the connecting arms 10 extend upwards, the upper ends of the connecting arms 10 are higher than the welding chamber 18, the two ends of the furnace cover 4 are symmetrically provided with mounting arms 12, the mounting arms 12 are horizontally arranged, one end of each mounting arm 12 is fixedly connected with the furnace cover 4, and the other end of each mounting arm 12 is rotatably connected with the upper end of the connecting arm 10. The furnace cover 4 is also connected with a furnace cover cylinder 3 which drives the furnace cover cylinder 3 to open and close, a piston rod of the furnace cover cylinder 3 is connected with the installation arm 12 through the connecting rod 13 and the swinging arm 11, the upper end of the installation arm 12 is rotationally connected with the middle part of the installation arm 12, the lower end of the installation arm 12 is rotationally connected with the middle part of the connecting rod 13, one end of the connecting rod 13 is rotationally connected with the frame 1 or the connecting arm 10, and the other end is rotationally connected with the piston rod of the furnace cover cylinder 3, so that the automatic opening and closing of the furnace cover 4 are realized.

As shown in fig. 2: the furnace cover 4 comprises a furnace cover on the upper side and a furnace cover mounting plate 14 on the lower side, wherein the furnace cover is a cuboid box with an opening on the lower side, the furnace cover mounting plate 14 is a cuboid plate, and the furnace cover mounting plate 14 is arranged on the lower side of the furnace cover and seals the opening of the furnace cover. The mounting arm 12 and the suction module are mounted on a furnace lid mounting plate 14.

In this embodiment, the shielding gas is nitrogen gas, the shielding gas intake pipe is main nitrogen gas intake pipe 5, the both ends of bell mounting panel 14 all are provided with main nitrogen gas intake pipe 5, the upper end of main nitrogen gas intake pipe 5 stretches out the bell jar, the upside of every main nitrogen gas intake pipe 5 all is provided with a direction cover 6, direction cover 6 interval sets up in the upside of the main nitrogen gas intake pipe 5 of corresponding side and with the upper end interval setting of main nitrogen gas intake pipe 5, direction cover 6 is cylindric, direction cover 6 and the equal vertical setting of main nitrogen gas intake pipe 5, direction cover 6 sets up in the upside of bell cover, and direction cover 6 sets up with main nitrogen gas intake pipe is coaxial, direction cover 6 can lead the pipeline that links to each other with main nitrogen gas intake pipe 5. Every main nitrogen gas intake pipe 5 all is provided with gas hood 15 between bell mounting panel 14, and the left and right sides on gas hood 15 upper portion is by down supreme inwards slope form gradually, and gas hood 15 sets up between bell mounting panel 14 and bell cover, and the downside of gas hood 15 is uncovered to be set up, and gas hood 15 downside and bell mounting panel 14 fixed connection, and bell 4 downside is provided with the slot hole that is used for with gas hood 15 and welding chamber 18 intercommunication to can spout into welding chamber 18 with the protection gas all with.

The upper side of the furnace cover mounting plate 14 is also provided with a purification air inlet pipe 7 and a purification air outlet pipe 8, the purification air inlet pipe 7 and the purification air outlet pipe 8 are communicated with the welding chamber 18 through a gas hood 15, and the purification air inlet pipe 7 and the purification air outlet pipe 8 are arranged on the same side of the negative pressure pumping module 9, so that the problem that welding oil is liquefied in the welding chamber 18 due to too low nitrogen temperature can be avoided, the temperature of a material sheet is low, and the welding time of the material sheet is prolonged. The purifying air outlet pipe 8 is communicated with the air inlet end of the purifying module 59, and the purifying air outlet pipe 8 is communicated with the air inlet end of the purifying module 59, so that welding oil vapor generated by heating welding oil in solder paste can be cleaned, and welding of a material sheet is prevented from being influenced by the welding oil vapor.

As shown in fig. 3 to 5: auxiliary nitrogen inlet pipes 16 are symmetrically arranged on two sides of the middle of the furnace cover mounting plate 14. The auxiliary nitrogen gas inlet pipe 16 is arranged on the upper side of the furnace cover mounting plate 14, and the air outlet end of the auxiliary nitrogen gas inlet pipe 16 is communicated with the welding chamber 18, so that nitrogen can be more uniformly sprayed into the welding chamber 18, the nitrogen in the welding chamber 18 is ensured to be completely discharged, and the reaction between the heated material sheet and oxygen is avoided. The middle part downside of bell mounting panel 14 is provided with air inlet 17, and air inlet 17 is rectangular shaped plate, and the upside of air inlet 17 is provided with the ascending air inlet 1701 of opening, and air inlet 1701 is the slot hole that sets up along air inlet 17 length direction, and every side of bell mounting panel 14 all is provided with two air inlet 17, and two air inlet 17 arrange in proper order along the length direction of bell mounting panel 14, all is provided with a plurality of fumaroles 1702 along length direction interval on every air inlet 17 to can guarantee to spout into in the welding chamber 18 with nitrogen gas is even. The downside of bell mounting panel 14 is provided with indent installing port 1401, and installing port 1401 and air inlet plate 17 one-to-one, and in installing port 1401 of bell mounting panel 14 was installed on the upper portion of air inlet plate 17, and the air inlet 1701 of every air inlet plate 17 all encircleed with installing port 1401 of bell mounting panel 14 and become the air inlet chamber, and the end of giving vent to anger of vice nitrogen gas intake pipe 16 communicates with the air inlet chamber to conveniently spout nitrogen gas to the air inlet intracavity.

As shown in fig. 6 to 7: the handling mechanism 2 comprises handling rods 24, a lifting mechanism, a translation mechanism and an opening and closing mechanism, wherein the lifting mechanism, the translation mechanism and the opening and closing mechanism are arranged on the lower side of the welding chamber 18, the middle part of the handling rods 24 is arranged in the welding chamber 18, two ends of the welding chamber 18 are sealed through end covers 26, handling ports 2601 are formed in two sides of each end cover 26, the handling rods 24 are horizontally arranged along the length direction of the welding chamber 18, the two handling rods 24 are symmetrically arranged on two sides of the welding chamber 18, and two ends of each handling rod 24 penetrate through the handling ports 2601 of the end covers 26 and extend out. The downside level of welding room 18 is provided with transport installation arm 45, transport installation arm 45 and carrier bar 24 one-to-one, transport installation arm 45 sets up the carrier bar 24 downside at corresponding side, the both ends of every carrier bar 24 all link to each other with the transport installation arm 45 of corresponding side through mounting panel 22, the upper end of mounting panel 22 links to each other with carrier bar 24, the lower extreme of mounting panel 22 links to each other with transport installation arm 45, elevating system installs on frame 1, translation mechanism installs on elevating system, opening and shutting mechanism installs on translation mechanism, and opening and shutting mechanism links to each other with two carrier bars 24 simultaneously, thereby realized opening and shutting, lift and translation action of two carrier bars 24, the transport of convenient tablet.

An adjusting spring 23 is arranged between one end of each carrying rod 24 and the mounting plate 22, the adjusting spring 23 is sleeved on the carrying rods 24, one end of each carrying rod 24 close to the adjusting spring 23 is in sliding connection with the mounting plate 22, the adjusting spring 23 is arranged outside the mounting plate 22, one end of each adjusting spring 23 is supported on the mounting plate 22, and the other end of each adjusting spring is supported at the end of each carrying rod 24, so that the position adjusting spring 23 for adjusting the carrying rods 24 in the axial direction can play a role of buffering, and the falling of a tablet caused by impact load generated in the carrying process is avoided.

The lower sides of the end caps 26 at the two ends of the welding chamber 18 are spaced from the upper side of the welding table 20, so that a feed end and a discharge end are formed at the two ends of the welding chamber 18, one end close to the heating area is the feed end of the welding chamber 18, and the other end close to the cooling area is the discharge end of the welding chamber 18. The both ends of every end cover 26 all are provided with vertical baffle mounting groove 2602, and slidable mounting has baffle 27 in baffle mounting groove 2602, baffle 27 and carrier bar 24 sliding connection, and seal between baffle 27 and the carrier bar 24 and set up, baffle 27 seals carrier port 2601 to can be in carrier bar 24 transport tablet in-process baffle 27 along with carrier bar 24 at the plane that end cover 26 is located, make baffle 27 seal carrier port 2601 all the time, avoid nitrogen leakage, still removed the restriction to carrier port 2601 size, and then can make things convenient for the setting of carrier bar 24's motion trail. The baffle 27 also seals the gap between the end cap 26 and the welding station 20, i.e., the feed end or discharge end, and opens the discharge end when the carrier bar 24 holds up the web, facilitating the movement of the web into or out of the welding chamber 18, avoiding nitrogen leakage. Sealing sleeves 25 are mounted at two ends of each carrying rod 24, and each carrying rod 24 is in sliding and sealing connection with a baffle 27 through the sealing sleeve 25.

As shown in fig. 8: the welding station 20 comprises a plurality of heating plates 30 and a plurality of cooling plates 28, wherein the plurality of heating plates 30 are sequentially arranged along the length direction of the welding chamber 18 to form a heating zone, the plurality of cooling plates 28 are sequentially arranged along the length direction of the welding chamber 18 to form a cooling zone, and the cooling zone is arranged close to the discharge end. The negative pressure pumping module 9 is arranged on the upper side of the heating plate 30 near one end of the cooling area.

The two ends of each heating plate 30 are symmetrically provided with heating plate abdicating openings 3001, the two ends of each cooling plate 28 are symmetrically provided with cooling plate abdicating openings 2801, a plurality of bearing parts are arranged on each carrying rod 24 at intervals, and the bearing parts extend into the heating plate abdicating openings 3001 or the cooling plate abdicating openings 2801 and hold up the material sheets horizontally placed on the heating plates 30 or the cooling plates 28, so that the material sheets can be integrally placed on the cooling plates 28 or the heating plates 30, the material sheets are prevented from being heated and softened, the two ends are deformed, and the negative pressure module 9 and the heating plates 30 are conveniently sealed.

The electrothermal tubes 31 are symmetrically arranged on two sides of each heating plate 30, and the temperature sensors 32 are arranged on the heating plates 30 between the two electrothermal tubes 31, so that independent control of each heating plate 30 is realized, the temperature of the heating plates 31 is gradually increased along the direction close to the discharge end, and therefore the material sheets are gradually heated, and solder paste dripping caused by too fast heating is avoided. Every cooling plate 28 is last all to be connected with inlet tube 29, and the cooling plate 28 cools down the tablet on the cooling platform 28 through the cooling water, and along the direction that is close to the discharge end, the temperature of cooling platform 28 reduces gradually to progressively cool down the tablet, avoid cooling down too soon and lead to the solder paste of solidification to split.

The feeding end outside of the welding chamber 18 is provided with a feeding table 21, two ends of the feeding table 21 are provided with feeding table abdicating openings 2101 matched with the bearing parts, the feeding table 21 is provided with a tablet, and the tablet can be conveyed to the welding table 20 in the welding chamber 18 by the conveying mechanism 2. The discharge end of welding room 18 is provided with ejection of compact platform 19, and the both ends of ejection of compact platform 19 all are provided with supporting portion matched with ejection of compact platform and give way the mouth 1901, and handling mechanism 2 carries the tablet after the cooling to ejection of compact bench 19 to make this vacuum welding stove realize the welding of continuity, can realize ejection of compact and feeding without opening bell 4.

As shown in fig. 9: the bottom of welding room 18 is provided with liquid collecting cover 33, and the both sides of liquid collecting cover 33 are the slope form that gradually descends from lateral part to middle part, and the middle part both ends symmetry of liquid collecting cover 33 are provided with liquid collecting cover drain pipe 3301, and liquid collecting cover 33 can collect the water droplet that the cooling zone liquefaction formed and send out outside welding room 18, avoids causing the hindrance to the welding of tablet in welding room 18.

As shown in fig. 10: the heating plate 30 is a rectangular plate, and a heating plate mounting hole 3004 is provided at a corner of the heating plate 30. The electric heating tube mounting holes 3002 are symmetrically formed in two sides of the heating plate 30, the electric heating tube mounting holes 3002 are through holes which are horizontally arranged, and each electric heating tube mounting hole 3002 is internally provided with one electric heating tube 31, so that uniform heating can be ensured. The middle part of the heating plate 30 is also provided with a horizontal sensor mounting hole 3003, the sensor mounting hole 3003 is a blind hole parallel to the electric heating tube mounting hole 3002, the length of the sensor mounting hole 3003 is half of the length of the heating plate 30, and the temperature sensor 32 is mounted in the sensor mounting hole 3003, so that the temperature of the heating plate 30 can be detected in real time.

As shown in fig. 11: the cooling plate 28 is rectangular plate with length and width equal to length and width of the heating plate 30 respectively, the corner of the cooling plate 28 is provided with a cooling plate mounting hole 2804, two sides of the cooling plate 28 are symmetrically provided with horizontal water inlet channels 2802, the water inlet channels 2802 are arranged along the length direction of the cooling plate 28, one end of the cooling plate 28 is provided with a horizontal water outlet channel 2803, and the water outlet channel 2803 communicates the two water inlet channels 2802, so that the temperature of the whole cooling plate 28 is uniform, and the cooling effect is good. Both ends of the water discharging passage 2803 and the water inlet passage 2802 are provided with connection parts, thereby facilitating connection of the water inlet pipe 29 and the water outlet pipe.

As shown in fig. 12 to 13: the welding chamber 18 is arranged on the upper side of the frame 1, and the welding chamber 18 is fixedly connected with the frame 1 through a welding chamber mounting piece 40. A plurality of welding chamber mounting pieces 40 are symmetrically arranged on two sides of the welding chamber 18, fixing portions 4001 protruding downwards are symmetrically arranged on two ends of the lower side of the welding chamber mounting pieces 40, through holes are formed in the fixing portions 4001, and the welding chamber mounting pieces 40 are fixedly connected with the frame 1 through bolts arranged in the through holes of the fixing portions 4001. The welding chamber mounting piece 40 is symmetrically provided with stepped holes 4002 at two ends, the diameter of the upper portion of each stepped hole 4002 is larger than the diameter of the lower portion, each stepped hole 4002 is provided with a mounting pin 39, each mounting pin 39 is cylindrical, the lower end of each mounting pin 39 is coaxially provided with a threaded hole 3901, each threaded hole 3901 is a blind hole formed in each mounting pin 39, the diameter of each mounting pin 39 is equal to the diameter of the upper portion of each stepped hole 4002, and the lower end of each mounting pin 39 extends into the upper portion of each stepped hole 4002 and is fixedly connected with the welding chamber mounting piece 40 through a bolt. The heating plate mounting holes 3004 of the heating plate 30 are sleeved on the upper portions of the mounting pins 39, so that the heating plate 30 is mounted, and the cooling plate mounting holes 2804 of the cooling plate 28 are sleeved on the upper portions of the mounting pins 39, so that the cooling plate 28 is mounted and dismounted conveniently.

As shown in fig. 14: the negative pressure pumping module 9 comprises a negative pressure pumping installation frame 34, a sealing plate 36, a connecting pipe 37 and a negative pressure pumping lifting cylinder 35, wherein the negative pressure pumping installation frame 34 is installed on the upper side of the furnace cover installation plate 14, the negative pressure pumping lifting cylinder 35 is installed on the negative pressure pumping installation frame 34, a piston rod of the negative pressure pumping lifting cylinder 35 is vertically arranged downwards, the sealing plate 36 is arranged on the lower side of the furnace cover installation plate 14, the sealing plate 36 is horizontally arranged, the bottom of the sealing plate 36 is concave inwards, a sealing ring is arranged on the bottom surface of the sealing plate 36 around the outer edge of the sealing plate, the sealing plate 36 and the heating plate 30 are encircled to form a negative pressure cavity, a material sheet to be welded is arranged in the negative pressure cavity, a horizontal connecting plate 38 is installed on the piston rod of the negative pressure pumping lifting cylinder 35, the connecting plate 38 is arranged on the upper side of the furnace cover installation plate 14, the connecting pipe 37 is arranged between the connecting plate 38 and the sealing plate 36, the connecting pipe 37 slides with the furnace cover installation plate 14 and is in sealing connection, the lower end of the connecting pipe 37 is communicated with the negative pressure cavity, and the upper end of the connecting pipe 37 is connected with the negative pressure pumping pipe.

As shown in fig. 15 to 16: the welding chamber 18 downside interval is provided with translation board 41, and transport installation arm 45 sets up between translation board 41 and welding chamber 18, and transport installation arm 45 passes through mount pad slidable mounting on translation board 41, and translation mechanism links to each other with translation board 41 and drives translation board 41 and translate along the transport direction of tablet. The lower side interval of translation board 41 is provided with horizontal transport mounting panel 52, and the upper portion bilateral symmetry of transport mounting panel 52 is provided with translation board guide rail 51, and translation board guide rail 51 and the central line parallel arrangement of transport pole 24, translation board 41 through setting up the translation board slider slidable mounting of downside on translation board guide rail 51, and transport mounting panel 52 installs on elevating system and goes up and down along with elevating system.

The lifting mechanism comprises a horizontally arranged translation frame 49, a lifting guide block 48, a lifting guide frame 47 and a carrying lifting cylinder 46, wherein a horizontal translation frame guide rail 50 is arranged on the frame 1, the translation frame guide rail 50 and a translation plate guide rail 51 are arranged in parallel, and the translation frame 49 is slidably arranged on the translation frame guide rail 50 through a translation frame sliding block at the lower side. The carrying lifting cylinder 46 is horizontally arranged on the frame 1, and a piston rod of the carrying lifting cylinder 46 is arranged towards the direction of the translation frame 49, and the piston rod of the carrying lifting cylinder 46 is connected with the translation frame 49 and pushes the translation frame 49 to move along the carrying direction of the material sheet. The lifting guide blocks 48 are symmetrically arranged on two sides of the translation frame 49, lifting guide parts are arranged on the upper sides of the lifting guide blocks 48, the lifting guide parts are gradually upwards inclined along the direction close to the carrying lifting cylinder 46, the lifting guide frames 47 are in one-to-one correspondence with the lifting guide blocks 48, lifting guide wheels are rotatably arranged on the lower sides of the lifting guide frames 47, and the lifting guide wheels are attached to the lifting guide parts of the lifting guide blocks 48 on the corresponding sides, so that the carrying mounting plate 52 is lifted. The frame 1 is provided with a vertical lifting guide rail, and the lifting mounting plate 52 is slidably mounted on the lifting guide rail through a lifting slide block so as to guide the carrying mounting plate 52.

The translation mechanism includes translation frame motor mounting bracket 54, transport removal frame 55 and translation motor 53, and translation motor mounting bracket 54 sets up the downside at transport mounting panel 52, and translation motor 53 installs on translation motor mounting bracket 54, and translation motor 53's output shaft level sets up and with the transport direction parallel arrangement of tablet. A translation screw is coaxially arranged on the translation motor 53, the translation screw synchronously rotates along with the translation motor 53, the carrying moving frame 55 is slidably arranged on the translation motor mounting frame 54, and a translation nut matched with the translation screw is arranged on the carrying moving frame 55. The upper side of the carrying and moving frame 55 passes through the carrying and mounting plate 52 and then is connected with the translation plate 41, and drives the translation plate 41 to synchronously move, and the carrying and moving frame 55 and the carrying and mounting plate 52 are arranged in a sliding manner.

The opening and closing mechanism includes an opening and closing mounting rod 42, an opening and closing guide plate 43, an opening and closing moving frame 56, an opening and closing motor mounting frame 57, an opening and closing moving frame 56, and an opening and closing power module, which in this embodiment is an opening and closing motor 58. The motor mounting bracket 57 opens and shuts sets up in the downside of carrying mounting panel 52, and the upside of motor mounting bracket 57 opens and shuts links to each other with translation board 41 and moves along with translation board 41 synchronization, and motor mounting bracket 57 opens and shuts and carries mounting panel 52 sliding connection. The open-close motor 58 is mounted on the open-close motor mounting bracket 57. The opening and closing moving frame 56 is slidably mounted on the opening and closing motor mounting frame 57, an opening and closing screw rod is coaxially mounted on an output shaft of the opening and closing motor 58, an opening and closing nut matched with the opening and closing screw rod is arranged on the opening and closing moving frame 56, and the opening and closing motor 58 drives the opening and closing moving frame 56 to translate along the conveying direction of the material sheets through a screw rod nut pair. The upper side of translation board 41 is provided with the installation pole slider, and installation pole 42 slidable mounting opens and shuts on the installation pole slider, and installation pole 42 that opens and shuts sets up along the transport direction of tablet, opens and shuts and moves the upside of frame 56 and link to each other with installation pole 42 that opens and shuts and drive installation pole 42 synchronous movement, opens and shuts and removes frame 56 and transport mounting panel 52 sliding connection. The two ends of the opening and closing installation rod 42 are respectively provided with an opening and closing guide plate 43, the two sides of the opening and closing guide plates 43 are respectively provided with an opening and closing guide part, the opening and closing guide parts are gradually inwards inclined along the conveying direction of the material sheets, the two ends of each conveying installation arm 45 are respectively provided with an opening and closing guide wheel 44, and an opening and closing spring for enabling the opening and closing guide wheels 44 to be attached to the opening and closing guide parts of the opening and closing guide plates 43 is further arranged between the two conveying installation arms 45. The translation plate 41 is also provided with a mounting arm guide rail which is perpendicular to the opening and closing mounting rod 42, and the carrying and mounting arm 45 is slidably mounted on the mounting arm guide rail through an opening and closing slider.

As shown in fig. 17 to 18: the purifying module 59 includes a purifying box 61, a coil 67 and a filter screen 64 arranged in the purifying box 61, the purifying box 61 is a cuboid box body, one side of the purifying box 61 is connected with a purifying box air inlet pipe 62, the other side of the purifying box 61 is connected with a purifying box air outlet pipe, and a fan 65 is arranged between the purifying box air outlet pipe and the welding chamber 18. The coil pipe 67 is arranged in the purifying box 61, the coil pipe 67 is also connected with the oil supply tank 60, the oil outlet of the oil supply tank 60 is communicated with one end of the coil pipe 67 through a circulating pump, and the other end of the coil pipe 67 is communicated with the oil supply tank 60, so that the circulation of cooling oil is realized. Fins 68 connected with the coil 67 are further arranged in the purifying box 61, so that heat exchange with nitrogen can be performed more quickly, and the temperature of the nitrogen can be reduced. The purifying box 61 is provided with filter screen mounting box 63 near one side of purifying box outlet duct, and purifying box outlet duct passes through filter screen mounting box 63 and purifying box 61 intercommunication, and filter screen 64 vertical setting is in filter screen mounting box 63, and the nitrogen gas after the cooling passes through filter screen 64 and discharges through the purifying box outlet duct to in the welding room 18 again, filter screen 64 is used for filtering the welding oil after the liquefaction, thereby detach the welding oil steam in the nitrogen gas.

The lower side of the purifying box 61 is also provided with a welding oil collecting barrel 66, and the lower side of the purifying box 61 is inclined along one end which is close to the welding oil collecting barrel 66 and lower than the other end, so that the liquid after cooling and liquefying can flow into the welding oil collecting barrel 66.

The welding process of the vacuum welding furnace comprises the following steps of:

1) The furnace cover 4 seals the welding chamber 18, and the protective gas inlet pipe fills protective gas into the welding chamber 18;

the welding chamber 18 is filled with nitrogen through the main nitrogen inlet pipe 5 and the sub nitrogen inlet pipe 16, so that the whole welding chamber 18 is filled with nitrogen, and the air in the welding chamber 18 is completely discharged. At the same time, the electric heating tube 31 heats the heating plate 30, and the water inlet pipe 29 is used for introducing cooling water into the cooling plate 28.

2) The conveying mechanism 2 conveys the material sheets into the negative pressure cavity piece by piece, and the heating area gradually heats the material sheets in the conveying process;

placing the material sheet on the feeding table 21, driving the carrying rods 24 to move downwards by the lifting mechanism, driving the two carrying rods 24 to move downwards to a position close to the material sheet by the opening and closing mechanism, aligning with the feeding table yielding opening 2101 on the feeding table 21, driving the carrying rods 24 to move downwards again by the lifting mechanism, enabling the bearing part to be positioned in the feeding table yielding opening 2101, and driving the two carrying rods 24 to move inwards again by the opening and closing mechanism, and enabling the bearing part to move to the lower sides of two ends of the material sheet. The lifting mechanism drives the carrying rod 24 to move upwards to finish the lifting of the material sheets, meanwhile, the baffle plate 27 at the feeding end opens the feeding end, and the translation mechanism drives the carrying rod 24 to move towards the direction close to the discharging end of the welding chamber 18 and carries the material sheets to the heating plate 30 in the welding chamber 18. The conveyance mechanism 2 sequentially conveys the web, and the web is heated by each heating plate 30 and then enters the heating plate 30 directly below the negative pressure suction module 9.

The negative pressure pumping lifting cylinder 35 drives the sealing plate 36 to move downwards, so that the sealing plate 36 and the heating plate 30 right below the sealing plate are surrounded to form a sealed negative pressure cavity, and meanwhile, the negative pressure pumping pipe is used for pumping gas in the negative pressure cavity, so that the negative pressure cavity maintains a negative pressure or even a vacuum state, bubbles in solder paste are ensured to overflow, and the welding quality is ensured. The negative pressure pumping lifting cylinder 35 drives the sealing plate 36 to lift after the welding is completed.

3) The conveying mechanism 2 conveys the material sheets welded in the negative pressure cavity to the discharge end, and the cooling area gradually cools the material sheets.

The conveying mechanism 2 continues to convey the material sheet toward the discharge end, and after the material sheet is cooled by each cooling plate 28 in turn, the material sheet is moved onto the discharge table 19, and the welding of the material sheet is completed.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the invention in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a vacuum welding stove, includes welding chamber (18), bell (4) and transport mechanism (2), and bell (4) lid closes in welding chamber (18) upside to form the welding chamber between welding chamber (18) and bell (4), welding chamber (18) lower part is equipped with welding table (20), its characterized in that: the welding device is characterized in that a heating area is arranged on one side, close to a feeding end, of the welding table (20), a cooling area is arranged on one side, close to a discharging end, of the welding table (20), a negative pressure pumping module (9) is arranged on the upper side, close to the cooling area, of one end of the heating area, the negative pressure pumping module (9) is installed on the furnace cover (4) in a lifting mode, a closed negative pressure cavity is formed by surrounding the bottom of the negative pressure pumping module (9) and the heating area, and a protective gas inlet pipe is arranged on the welding chamber (18) or the furnace cover (4);

the welding table (20) comprises a plurality of heating plates (30) and a plurality of cooling plates (28), wherein the heating plates (30) are spliced into a heating zone, and the cooling plates (28) are spliced into a cooling zone;

the conveying mechanism (2) comprises conveying rods (24) and lifting mechanisms, translation mechanisms and opening and closing mechanisms which are arranged on the lower sides of the welding chambers (18), the two conveying rods (24) are symmetrically arranged, the middle parts of the conveying rods (24) are arranged in the welding chambers (18), the opening and closing mechanisms are connected with the two conveying rods (24) and drive the two conveying rods to open and close, the translation mechanisms are connected with the opening and closing mechanisms and drive the two conveying rods to move along the direction close to or far away from the discharge ends, the lifting mechanisms are connected with the translation mechanisms and drive the lifting mechanisms to lift the lifting mechanisms, a plurality of supporting portions are arranged on each conveying rod (24), a plurality of abdicating openings are formed in two ends of the welding table (20), and the abdicating openings correspond to the supporting portions one by one.

2. The vacuum welding furnace according to claim 1, wherein: the electric heating plates (30) are symmetrically arranged on two sides of each heating plate (30), the middle of each heating plate (30) is provided with a sensor mounting hole (3003), the sensor mounting holes (3003) are blind holes arranged between the two electric heating plates (31), and a temperature sensor (32) is arranged in each sensor mounting hole (3003).

3. The vacuum welding furnace according to claim 1, wherein: water inlet channels (2802) are symmetrically arranged on two sides of each cooling plate (28), and at least one end of each cooling plate (28) is provided with a water drainage channel (2803) communicated with the two water inlet channels (2802).

4. The vacuum welding furnace according to claim 1, wherein: the lower side of the welding chamber (18) is provided with a liquid collecting cover (33), two sides of the bottom of the liquid collecting cover (33) are gradually inclined downwards from the side part to the middle part, and a liquid collecting cover liquid outlet pipe (3301) is arranged at the bottom of the liquid collecting cover (33).

5. The vacuum welding furnace according to claim 1, wherein: the protection gas inlet pipe is a main nitrogen inlet pipe (5), both ends of the furnace cover (4) are provided with the main nitrogen inlet pipe (5), the two sides of the middle part of the furnace cover (4) are symmetrically provided with auxiliary nitrogen inlet pipes (16), and the auxiliary nitrogen inlet pipes (16) are communicated with the welding chamber (18).

6. The vacuum welding furnace according to claim 5, wherein: the gas inlet device is characterized in that gas inlet plates (17) are symmetrically arranged on two sides of the lower portion of the furnace cover (4), a gas inlet (1701) with an opening at the upper side is arranged on the upper portion of the gas inlet plates (17) and surrounds the furnace cover (4) to form a gas inlet cavity, a plurality of gas injection holes (1702) for communicating the gas inlet (1701) with the welding chamber (18) are formed in the gas inlet plates (17) at intervals, and the auxiliary nitrogen gas inlet pipe (16) is communicated with the gas inlet (1701).

7. The vacuum welding furnace according to claim 1, wherein: both ends of welding room (18) all pass through end cover (26) and seal, the both sides of every end cover (26) all are provided with transport mouth (2601) symmetrically, transport pole (24) pass transport mouth (1601) and link to each other with opening and shutting mechanism, the bottom of end cover (26) sets up with welding table (20) interval.

8. The vacuum welding furnace according to claim 7, wherein: baffle mounting grooves (2602) are symmetrically formed in two ends of each end cover (26), a plane where the baffle mounting grooves (2602) are formed is perpendicular to the center line of the carrying rod (24), baffles (27) are slidably mounted in the baffle mounting grooves (2602), the baffles (27) are slidably and hermetically connected with the carrying rod (24), and the baffles (27) are matched with the end covers (26) on the corresponding sides to seal the end portions of the welding chambers (18).

9. The vacuum welding furnace according to claim 1, 7 or 8, wherein: the lower side of the welding chamber (18) is provided with carrying installation arms (45) which are in one-to-one correspondence with the carrying rods (24), two ends of the carrying installation arms (45) are connected with two ends of the carrying rods (24) on the corresponding side, and the opening and closing mechanism is connected with the two carrying installation arms (45).

10. The vacuum welding furnace according to claim 1, wherein: the folding mechanism comprises a folding guide plate (43) and a folding power module, wherein the folding guide plate (43) is horizontally arranged, the folding guide plate (43) is arranged between two conveying rods (24), both sides of the folding guide plate (43) are respectively provided with a folding guide part which is gradually inclined inwards along the direction close to the discharge end, folding guide wheels (44) which are attached to the folding guide parts are respectively installed on the lower side of each conveying rod (24), folding springs in a stretching state are arranged between the two conveying rods (24), and the folding power module is connected with the folding guide plate (43) and drives the folding guide plates to move along the direction close to or far away from the discharge end.

11. The vacuum welding furnace according to claim 1, wherein: the lifting mechanism comprises a lifting guide block (48) and a carrying lifting cylinder (46), wherein the upper side of the lifting guide block (48) is provided with a lifting guide part which gradually inclines downwards along the direction close to the discharge end, the lower side of the translation mechanism is provided with a lifting guide wheel attached to the lifting guide part, and a piston rod of the carrying lifting cylinder (46) is connected with the lifting guide block (48) and pushes the lifting guide block to move along the direction close to or far away from the discharge end.

12. The vacuum welding furnace according to claim 1, wherein: the negative pressure pumping module (9) comprises a sealing plate (36) and a negative pressure pumping lifting cylinder (35), wherein the sealing plate (36) is arranged on the upper side of the heating zone and is parallel to the heating zone, the bottom of the sealing plate (36) and the heating zone are surrounded to form a closed negative pressure cavity, and the negative pressure cavity is connected with a negative pressure pumping pipe.

13. The vacuum welding furnace of claim 12, wherein: the sealing plate (36) is arranged at the lower side of the furnace cover (4), the negative pressure pumping lifting cylinder (35) is arranged at the upper side of the furnace cover (4), a piston rod of the negative pressure pumping lifting cylinder (35) is connected with the sealing plate (36) through a connecting pipe (37), and the connecting pipe (37) is used for communicating the negative pressure cavity with the negative pressure pumping pipe.

14. The vacuum welding furnace according to claim 1, wherein: the welding device further comprises a purification module (59), and an air inlet end and an air outlet end of the purification module (59) are communicated with the welding chamber (18).

15. The vacuum welding furnace of claim 14, wherein: the purification module (59) include purifying box (61) and coil pipe (67) and filter screen (64) of setting in purifying box (61), inlet end and the end of giving vent to anger set up respectively in the both sides of purifying box (61), filter screen (64) are close to the end setting of giving vent to anger and seal the end of giving vent to anger, are filled with circulating coolant in coil pipe (67), are provided with fan (65) between the end of giving vent to anger of purifying box (61) and welding room (18).

16. The vacuum welding furnace of claim 15, wherein: the purification module (59) also comprises fins (68) arranged in the purification box (61).

17. A welding process of a vacuum welding furnace according to any one of claims 1 to 16, characterized in that: the method comprises the following steps:

1) The furnace cover (4) seals the welding chamber (18), and the protective gas inlet pipe blows protective gas into the welding chamber (18);

2) The conveying mechanism (2) conveys the material sheets into the negative pressure cavity piece by piece, and the heating area gradually heats the material sheets in the conveying process;

3) The conveying mechanism (2) conveys the material sheets welded in the negative pressure cavity to the discharge end, and the cooling area gradually cools the material sheets.