CN211889337U

CN211889337U - Brazing furnace

Info

Publication number: CN211889337U
Application number: CN201922502096.2U
Authority: CN
Inventors: 杨超; 詹淼; 吴海
Original assignee: Anhui Xinfu New Energy Technology Co ltd
Current assignee: Anhui Xinfu New Energy Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-11-10
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses a brazing furnace, which comprises a support, a mesh belt conveying device, a preheating box chamber, a brazing box chamber, a cooling box chamber and a nitrogen control device, wherein the mesh belt conveying device is arranged on the support, the input end and the output end of the mesh belt conveying device are respectively a feeding area and a discharging area, the preheating box chamber, the brazing box chamber and the cooling box chamber are sequentially arranged on the support, and the brazing box chamber is also connected with the nitrogen control device; the nitrogen control device comprises a nitrogen controller, a nitrogen pipeline, a hose, a universal nitrogen sprayer and a lifting structure. The utility model has the advantages that the brazing furnace can cool the structure with thin thickness of the product to be brazed, reduce the heat absorption capacity, simultaneously, the heat absorption capacity of the thicker structure of the product to be brazed is not influenced, the welding of the product to be brazed with uneven thickness is realized, the overburning phenomenon is prevented, and the welding quality of the product is improved; meanwhile, the operation of the lifting structure ensures that the product to be welded can be normally conveyed in the whole conveying process.

Description

Brazing furnace

Technical Field

The utility model relates to a equipment technical field that brazes specifically is a stove of brazing.

Background

The brazing furnace is a device for effectively connecting the parts of the aluminum heat exchanger, and performs welding by utilizing the characteristic that the melting point of the alloy of the brazing filler metal is lower than that of the metal material. The brazing filler metal is usually placed near or in the welding surfaces of the parts to be joined, aluminium brazing flux is applied between and on the surfaces of the parts, and the parts are heated under a certain inert gas shield to a temperature at which the brazing alloy melts but the part metal does not melt. The flux breaks the oxide film of the metal material, so that the surface diffusion is carried out between the molten metal and the unmelted metal, and after cooling, the metal bonding is formed between the solder metal and the contact surface of the component.

The welding temperature in the furnace of the existing brazing furnace is uniformly distributed, and only products with uniform thickness can be welded, and when the general products with irregular shapes and the welding parts have non-uniform thickness, the heat absorption capacity of the welding parts is different, so that the products cannot be welded, even the overburning phenomenon occurs, and the welding quality of the products is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve lies in: the utility model provides a can guarantee that inhomogeneous product of thickness can weld on, prevent to appear the brazing furnace of overburning phenomenon to solve current inhomogeneous product of thickness can not weld on, appear the problem of overburning phenomenon even.

In order to solve the technical problem, the utility model provides a following technical scheme:

a brazing furnace comprises a support, a mesh belt conveying device, a preheating box chamber, a brazing box chamber, a cooling box chamber and a nitrogen control device, wherein the mesh belt conveying device is arranged on the support, the input end and the output end of the mesh belt conveying device are respectively a feeding area and a discharging area, the preheating box chamber, the brazing box chamber and the cooling box chamber are sequentially arranged on the support between the feeding area and the discharging area along the conveying direction of the mesh belt conveying device, and the brazing box chamber is also connected with the nitrogen control device capable of adjusting the local temperature in the brazing box chamber;

nitrogen gas controlling means includes nitrogen gas controller, nitrogen gas pipeline, hose, universal nitrogen gas sprayer and elevation structure, nitrogen gas controller and elevating system all fix in the case room outside of brazing, nitrogen gas pipeline and universal nitrogen gas sprayer are all fixed in the case room of brazing, the nitrogen gas controller is connected to the input of nitrogen gas pipeline, and the output stretches out the case room of brazing and connects the hose in the case room outside of brazing, the one end that the nitrogen gas pipeline was kept away from to the case room of brazing and connection hose is stretched out to universal nitrogen gas sprayer's input, universal nitrogen gas sprayer's input is still connected the elevation structure that can drive universal nitrogen gas sprayer up-and-down motion.

Preferably, universal nitrogen gas sprayer includes inside hollow worm, nitrogen gas branch pipe, shower nozzle and nozzle, worm one end is stretched out brazing case room coupling hose, and the other end is fixed and is connected with a plurality of nitrogen gas branch pipes in the brazing case room, the lower extreme of nitrogen gas branch pipe is equipped with a plurality of diverts that can buckle, the fixed nozzle of output of shower nozzle, shower nozzle and nozzle quantity and position set up according to treating the welding product shape, the one end that the worm stretches out brazing case room is still connected the elevating system that can drive its up-and-down motion.

Preferably, the lifting mechanism comprises a first motor and a worm wheel, the first motor is fixed on the outer side of the brazing box chamber, the output end of the first motor is connected with the worm wheel, and the worm wheel and the worm are matched to form a worm-gear type steering structure.

Preferably, both ends of the hose are respectively connected with the nitrogen pipeline and the worm through the joint converter.

Preferably, the mesh belt conveying device comprises a first motor, a driving belt pulley, a conveying roller group, a mesh belt, a driven belt pulley and a belt; the utility model discloses a cooling device, including first motor, fixed conveying rod group between the support, conveying rod group goes up the cover and establishes by the guipure that can circulate transport, the guipure runs through in proper order and preheats case room, brazing case room and cooling tank room, the side of conveying rod group one end is fixed with driven pulley, driven pulley passes through the belt and is connected with driving pulley.

Preferably, the feeding area is further fixed with a timing limiting conveying device, and the timing limiting conveying device comprises a limiting mechanism for limiting the movement route of the product to be welded and a timing conveying mechanism.

Preferably, stop gear includes first limiting plate and the second limiting plate parallel with guipure conveyor direction of delivery, first limiting plate and second limiting plate are all fixed with the support that corresponds the side through the connecting rod, the spacing bottom surface of first limiting plate and second is all a little higher than the guipure upper surface.

Preferably, the timing mechanism includes the second motor, rotates wheel, pivot, dwang and bracing piece, the second motor is fixed in the side that the support is close to first limiting plate, the fixed rotation wheel of output of second motor, the edge of rotating the wheel is fixed with the lug, the side that first limiting plate is close to the second motor still is fixed with the pivot of stretching out first limiting plate, be fixed with in the pivot and rotate and to the dwang that the second limiting plate direction extends, the dwang is close to the one end of rotating the wheel can with the lug cooperation, the rotation of lug drives the dwang and rotates, still be fixed with on the second limiting plate and be used for supporting the dwang and keep away from the one end of rotating the wheel.

Preferably, the nitrogen pipeline is a stainless steel pipeline capable of being freely bent.

Preferably, the cooling cabinet is an air cooling cabinet.

Compared with the prior art, the beneficial effects of the utility model are that:

1. through the arrangement of the universal nitrogen injector, nitrogen injection can be carried out on a structure with a thin thickness of a product to be welded, so that local cooling is realized, the heat absorption capacity of the structure with the thin thickness is reduced, meanwhile, the heat absorption capacity of a structure with a thicker product to be welded is not influenced, the welding of the product to be welded with uneven thickness is realized, the overburning phenomenon is prevented, and the welding quality of the product is improved; in addition, the universal nitrogen injector is driven to move upwards through the operation of the lifting structure, the next product to be welded can be normally conveyed to the position under the universal nitrogen injector, then the operation of the lifting structure is controlled to drive the universal nitrogen injector to move downwards to align to the product to be welded to carry out nitrogen injection, the condition that the product to be welded can be normally conveyed in the whole conveying process is guaranteed, the hose is further arranged and arranged outside the brazing box chamber, the universal nitrogen injector can move up and down, and the hose is prevented from being melted by high temperature in the brazing box chamber.

2. Through the arrangement of the limiting mechanism, the products to be welded can move along the same axis after being placed on the mesh belt conveying device, and the products to be welded can be located right below the universal nitrogen injector after being conveyed by the mesh belt conveying device, so that the nozzle position is ensured to correspond to the structural position of the products to be welded, wherein the structural position of the products to be welded is thin in thickness.

3. Through the setting of timing conveying mechanism, guaranteed to treat that the interval that the welding product carried is the homoenergetic to conveniently control nitrogen gas controlling means's nitrogen gas injection interrupted time, treat the preceding of welding product and treat that the welding product is carried to the time under the universal nitrogen gas sprayer by the universal nitrogen gas sprayer under and be nitrogen gas controlling means's nitrogen gas injection interrupted time and elevating system's lift interval time.

4. Through controlling the length of nitrogen pipeline in the brazing chamber to nitrogen gas pipeline bending to the distance that control nitrogen gas passes through at brazing chamber, and then the time through control nitrogen gas heating comes control nitrogen gas from the temperature when the nozzle blowout, avoids treating that the welded product meets nitrogen gas that the temperature is too low and causes the chilling, leads to the product to scrap.

Drawings

FIG. 1 is a schematic structural view of a brazing furnace according to an embodiment of the present invention;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is a schematic structural view of the universal nitrogen injection according to the embodiment of the present invention;

fig. 4 is a schematic structural view of a timing, limiting and conveying device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a timing mechanism according to an embodiment of the present invention.

Detailed Description

In order to facilitate the understanding of the technical solutions of the present invention by those skilled in the art, the technical solutions of the present invention will now be further described with reference to the drawings attached to the specification.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless explicitly stated or limited otherwise, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 3, the embodiment discloses a brazing furnace, which includes a support 1, a mesh belt conveyer 2, a preheating box chamber 3, a brazing box chamber 4, a cooling box chamber 5 and a nitrogen gas control device 6, wherein the support 1 is provided with the mesh belt conveyer 2 for conveying a product 7 to be brazed, an input end and an output end of the mesh belt conveyer 2 are respectively a feeding area and a discharging area, the support 1 between the feeding area and the discharging area is sequentially provided with the preheating box chamber 3, the brazing box chamber 4 and the cooling box chamber 5 along a conveying direction of the mesh belt conveyer 2, the brazing box chamber 5 is further connected with the nitrogen gas control device 6 capable of adjusting a local temperature in the brazing box chamber 5, the product 7 to be brazed is placed in the feeding area and conveyed into the preheating box chamber 3 through the mesh belt conveyer 2 for preheating, then conveyed into the brazing box chamber 4 for welding, and conveyed into the cooling box chamber 5 for cooling after welding, and finally, conveying the product to a blanking area to finish welding the product to be welded 7.

The nitrogen control device 6 comprises a nitrogen controller 61, a nitrogen pipeline 62, a hose 63, a universal nitrogen injector 64 and a lifting structure 65, wherein the nitrogen controller 61 and the lifting mechanism 65 are fixed on the outer side of the brazing box chamber 4, the nitrogen pipeline 62 and the universal nitrogen injector 64 are fixed in the brazing box chamber 4, the input end of the nitrogen pipeline 62 is connected with the nitrogen controller 61, the output end of the nitrogen pipeline extends out of the brazing box chamber 4 and is connected with the hose 63 on the outer side of the brazing box chamber 4, the input end of the universal nitrogen injector 64 extends out of the brazing box chamber 4 and is connected with one end, far away from the nitrogen pipeline 62, of the hose 63, and the input end of the universal nitrogen injector 64 is also connected with the lifting structure 65 capable of driving the universal nitrogen injector 64 to move up and; through the arrangement of the universal nitrogen injector 64, nitrogen injection can be carried out on a thin structure of the product 7 to be welded, so that local cooling is realized, the heat absorption capacity of the thin structure is reduced, the heat absorption capacity of a thicker structure of the product 7 to be welded is not influenced, the welding of the product 7 to be welded with uneven thickness is realized, the overburning phenomenon is prevented, and the welding quality of the product is improved; in addition, due to the irregular shape of the product 7 to be welded, the product 7 to be welded conveyed by the mesh belt conveying device 2 to the vicinity of the universal nitrogen injector 64 can touch the universal nitrogen injector 64, and the lifting structure 65 is arranged in the embodiment, after the products 7 to be welded are welded, the universal nitrogen injector 64 is driven to move upwards through the operation of the lifting structure 65, so that the next product 7 to be welded can be normally conveyed to the position right below the universal nitrogen injector 64, then the operation of the lifting structure 65 is controlled to drive the universal nitrogen injector 64 to move downwards to aim at the product 7 to be welded for nitrogen injection, so that the product 7 to be welded can be normally conveyed in the whole conveying process, and the universal nitrogen injector is arranged outside the brazing box chamber 4 through the arrangement of the hose 63, the hose 63 is also prevented from being melted by high temperature in the brazing box chamber 4 on the premise that the universal nitrogen injector 64 can move up and down.

The nitrogen gas controller 61 is a controller device that is commercially available.

Specifically, referring to fig. 2 and 3, the universal nitrogen injector 64 includes a worm 641, a nitrogen branch pipe 642, a nozzle 643 and a nozzle 644, the worm 641 extends out of the brazing box chamber 4 at one end and is connected with the hose 63, the other end of the worm is fixed in the brazing box chamber 4 and is connected with a plurality of nitrogen branch pipes 642, the nozzle 643 capable of being bent and turned is arranged at the lower end of the nitrogen branch pipe 642, the nozzle 643 can be bent and turned to realize nitrogen injection of products 7 to be welded in different shapes and can be accurately aligned with the structure of the products 7 to be welded, which needs to be cooled, the nozzle 644 is fixed at the output end of the nozzle 643, the number and the positions of the nozzle 643 and the nozzle 644 are set according to the shape of the products 7 to be welded, and the end of the worm 641 extending out of the brazing box chamber 4 is further.

The lifting mechanism 65 comprises a first motor 651 and a worm wheel 652, the first motor 651 is fixed on the outer side of the brazing box chamber 4, the output end of the first motor 651 is connected with the worm wheel 652, the worm wheel 652 and the worm 641 are matched to form a worm-and-gear type steering structure, so that the circumferential motion of the worm wheel 652 is converted into the linear motion of the worm 641, and therefore the nitrogen branch pipe 642, the nozzle 643 and the nozzle 644 are driven to move up and down, and the next product 7 to be welded can be guaranteed to be normally conveyed to the position under the nozzle 644 and the nitrogen of the product 7 to be welded can be sprayed.

Further, both ends of the hose 63 are connected to the nitrogen gas line 62 and the worm 652 through the joint converter 66, respectively.

Referring to fig. 1 again, the mesh belt conveying device 2 includes a second motor 21, a driving pulley 22, a conveying roller set 23, a mesh belt 24, a driven pulley 25, and a belt 26; second motor 21 is fixed on support 1, the output of second motor 21 is fixed with drive pulley 22, fixed conveying rod group 23 between the support 1, conveying rod group 23 goes up the cover and establishes the guipure 24 by can the circulation transport, guipure 24 runs through in proper order and preheats case room 3, brazing case room 4 and cooling tank room 5, the side that conveying rod group 25 one end is close to drive pulley 22 is fixed with driven pulley 25, driven pulley 25 passes through belt 26 and is connected with drive pulley 22, drives drive pulley 22 through the rotation of second motor 21 and rotates, and drive pulley 22 drives driven pulley 25 through belt 26 and rotates to drive conveying roller group 23 and rotate, drive guipure 24 circulation at last and rotate and carry and treat welding product 7.

Referring to fig. 1 and 4, the feeding area is further fixed with a timing limiting conveying device 8, the timing limiting conveying device 8 comprises a limiting mechanism 81 and a timing conveying mechanism 82 for limiting the movement route of the product 7 to be welded, the product 7 to be welded can move on the same axis after being placed on the mesh belt conveying device 2 through the arrangement of the limiting mechanism 81, the product 7 to be welded can be positioned right below the universal nitrogen injector 64 after being conveyed through the mesh belt conveying device 2, and the position of the nozzle 644 is ensured to correspond to the thin structure of the product 7 to be welded; by the aid of the timing conveying mechanism 82, the conveying intervals of the products 7 to be welded are equal, so that nitrogen gas spraying interruption time of the nitrogen gas control device 6 can be controlled conveniently, and the time for conveying the front product 7 to be welded of the product 7 to be welded to the position right below the universal nitrogen gas sprayer 64 from the position right below the universal nitrogen gas sprayer 64 is the nitrogen gas spraying interruption time of the nitrogen gas control device 6 and the lifting interval time of the lifting mechanism 65.

Further, the limiting mechanism 81 comprises a first limiting plate 811 and a second limiting plate 812 which are parallel to the conveying direction of the mesh belt conveying device 2, the first limiting plate 811 and the second limiting plate 812 are both fixed with the support 1 on the corresponding side through a connecting rod 813, the distance between the first limiting plate 811 and the second limiting plate 812 is slightly larger than the width of the product 7 to be welded, the product 7 to be welded can be guaranteed to move along the first limiting plate 811 and the second limiting plate 812 without movement deviation, and can be located right below the universal nitrogen injector 64 after movement, and the position of the nozzle 644 is guaranteed to correspond to the thin structure of the product 7 to be welded; the bottom surfaces of the first limiting plate 811 and the second limiting plate 812 are slightly higher than the upper surface of the mesh belt 24, so that the first limiting plate 811 and the second limiting plate 812 are prevented from influencing the transmission of the mesh belt 24.

Further, referring to fig. 4 and 5, the timing mechanism 82 includes a third motor 821, a rotation wheel 822, a projection 823, a rotation shaft 824, a rotation shaft 825 and a support bar 826, the third motor 821 is fixed on the side of the bracket 1 near the first limit plate 811, the output end of the third motor 821 fixes the rotating wheel 822, a projection 823 is fixed at the edge of the rotating wheel 822, a rotating shaft 824 extending out of the first limiting plate 811 is also fixed at the side of the first limiting plate 811 close to the third motor 821, a rotating rod 825 capable of rotating and extending toward the second limiting plate is fixed to the rotating shaft 824, the end of the rotating rod 825 near the rotating wheel 822 can engage the projection 823, the rotating rod 825 is driven to rotate by the rotation of the projection 823, and one end of the second limiting plate, which is close to the rotating rod 825, is further fixed with one end for supporting the rotating rod 825 away from the rotating wheel 822; when the projection 823 is not matched with the rotating rod 825, the rotating rod 825 is fixed between the rotating shaft 824 and the supporting rod 826 to block the to-be-welded products 7 in the limiting mechanism 81, the rotating wheel 822 is driven to rotate by the rotation of the third motor 821 to drive the projection 823 to rotate, when the projection 823 rotates to the rotating rod 825 and is matched with the end of the rotating rod 825, the rotating rod 825 is driven to rotate upwards along the rotating shaft 824, so that the to-be-welded products 7 move along the conveying direction of the mesh belt 24, when the projection 823 continues to rotate, the rotating rod 825 is matched and separated from the projection 823, the rotating rod 825 automatically falls back onto the supporting rod 826 to continue to block the next to-be-welded product 7, and the projection 823 continues to rotate, the above steps are repeated, the time of one circle of rotation of the projection 823 is the time interval between two continuous to-be-welded products 7, the timed conveying of the to-be-welded products 7 is completed, thereby facilitating control of the nitrogen gas injection intermittent time of the nitrogen gas control device 6 and the elevating interval time of the elevating mechanism 65.

Further, nitrogen pipeline 62 is the stainless steel pipeline that can freely buckle, buckles through the pipeline 62 to nitrogen pipeline and controls the length of nitrogen pipeline 62 in brazing case room 4 to the distance that control nitrogen gas passes through at brazing case room 4, and then controls the temperature of nitrogen gas when spouting from nozzle 633 through the time of control nitrogen gas heating, avoids treating that welded product 7 meets nitrogen gas that the temperature is too low and causes the chilling, leads to the product to scrap.

Further, the cooling box chamber 5 is an air cooling box chamber.

The working principle of the embodiment is as follows: placing the product 7 to be welded on the mesh belt 24 between the first limiting plate 811 and the second limiting plate 812 for transmission, driving the driving belt pulley 22 to rotate through the rotation of the second motor 21, driving the driven belt pulley 25 to rotate through the belt 26 by the driving belt pulley 22, so as to drive the conveying roller group 23 to rotate, and finally driving the mesh belt 24 to circularly rotate to convey the product 7 to be welded; when the projection 823 is not engaged with the rotating rod 825, the rotating rod 825 is fixed between the rotating shaft 824 and the supporting rod 826 to block the product 7 to be welded in the limiting mechanism 81, the rotating wheel 822 is driven to rotate by the rotation of the third motor 821, thereby causing the projection 823 to rotate, and when the projection 823 is rotated to the rotation shaft 825 and engaged with the end of the rotation shaft 825, the rotating rod 825 is driven to rotate upward along the rotating shaft 824, so that the product 7 to be welded moves in the conveying direction of the mesh belt 24, when the projection 823 rotates continuously, the rotating rod 825 is separated from the projection 823, the rotating rod 825 automatically falls back to the supporting rod 826 to continuously block the next product 7 to be welded, the bump 823 continues to rotate, the steps are repeated, the time of one circle of rotation of the bump 823 is taken as the interval time of conveying two continuous products to be welded 7, timing conveying of the products to be welded 7 is completed, and therefore the conveying intervals of the products to be welded 7 are equal; the steel wire is conveyed into a preheating box chamber 3 through a mesh belt 24 for preheating, and then conveyed into a brazing box chamber 4 for welding;

particularly, in the brazing box chamber 4, when the product 7 to be welded reaches the position right below the nozzle 644 and the structural position of the product 7 to be welded with thin thickness corresponds to the position, so that when the product 7 to be welded is welded in the brazing box chamber 4, the universal nitrogen gas injector 64 is controlled by the nitrogen gas controller 61 to inject nitrogen gas to the structural position of the product 7 to be welded with thin thickness, so as to cool the structural position, reduce the heat absorption capacity of the structure with thin thickness, simultaneously, the heat absorption capacity of the structure with thicker product 7 to be welded is not influenced, the welding of the product 7 to be welded with uneven thickness is realized, the overburning phenomenon is prevented, and the welding quality of the product is improved; and after the welding is finished, conveying the welded product to the cooling box chamber 5 for cooling, and finally conveying the welded product to a blanking area to finish the welding of the product 7 to be welded.

The above embodiments only show the embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.

Claims

1. A brazing furnace is characterized in that: the device comprises a support, a mesh belt conveying device, a preheating box chamber, a brazing box chamber, a cooling box chamber and a nitrogen control device, wherein the mesh belt conveying device is arranged on the support, the input end and the output end of the mesh belt conveying device are respectively a feeding area and a discharging area, the preheating box chamber, the brazing box chamber and the cooling box chamber are sequentially arranged on the support between the feeding area and the discharging area along the conveying direction of the mesh belt conveying device, and the brazing box chamber is also connected with the nitrogen control device capable of adjusting the local temperature in the brazing box chamber;

2. A brazing furnace according to claim 1, characterized in that: universal nitrogen gas sprayer includes inside hollow worm, nitrogen gas branch pipe, shower nozzle and nozzle, worm one end is stretched out brazing case room coupling hose, and the other end is fixed and is connected with a plurality of nitrogen gas branch pipes in the brazing case room, the lower extreme of nitrogen gas branch pipe is equipped with a plurality of diverged shower nozzles of can buckling, the fixed nozzle of output of shower nozzle, shower nozzle and nozzle quantity and position set up according to treating the welding product shape, the one end that the worm stretches out brazing case room is still connected and can be driven its up-and-down motion's elevating system.

3. A brazing furnace according to claim 2, wherein: elevating system includes first motor and worm wheel, first motor is fixed in the case room outside of brazing, the worm wheel is connected to the output of first motor, the worm wheel forms worm gear formula with the worm cooperation and turns to the structure.

4. A brazing furnace according to claim 2, wherein: and two ends of the hose are respectively connected with the nitrogen pipeline and the worm through the joint converter.

5. A brazing furnace according to claim 1, characterized in that: the mesh belt conveying device comprises a second motor, a driving belt pulley, a conveying roller set, a mesh belt, a driven belt pulley and a belt; the second motor is fixed on the support, the output of second motor is fixed with drive pulley, fixed conveying rod group between the support, conveying rod group goes up the cover and establishes the guipure by can endless conveying, the guipure runs through in proper order and preheats case room, case room and the cooling tank room of brazing, the side of conveying rod group one end is fixed with driven pulley, driven pulley passes through the belt and is connected with drive pulley.

6. A brazing furnace according to claim 5, wherein: the feeding area is further fixed with a timing limiting conveying device, and the timing limiting conveying device comprises a limiting mechanism and a timing conveying mechanism, wherein the limiting mechanism is used for limiting the movement route of a product to be welded.

7. A brazing furnace according to claim 6, wherein: the limiting mechanism comprises a first limiting plate and a second limiting plate which are parallel to the conveying direction of the mesh belt conveying device, the first limiting plate and the second limiting plate are fixed with the supports corresponding to the sides through connecting rods, and the limiting bottom surfaces of the first limiting plate and the second limiting plate are slightly higher than the upper surface of the mesh belt.

8. A brazing furnace according to claim 7, wherein: the timing conveying mechanism comprises a third motor, a rotating wheel, a rotating shaft, a rotating rod and a supporting rod, the third motor is fixed on the side face of the support close to the first limiting plate, the output end of the third motor is fixed on the rotating wheel, a protruding block is fixed on the edge of the rotating wheel, the rotating shaft extending out of the first limiting plate is further fixed on the side face of the first limiting plate close to the second motor, a rotating rod which can rotate and extend towards the second limiting plate is fixed on the rotating shaft, one end of the rotating rod close to the rotating wheel can be matched with the protruding block, the rotating rod is driven to rotate by the rotating of the protruding block, and one end of the rotating rod, which is used for supporting the rotating rod to be far away from the rotating wheel.

9. A brazing furnace according to claim 1, characterized in that: the nitrogen pipeline is a stainless steel pipeline capable of being bent freely.

10. A brazing furnace according to claim 1, characterized in that: the cooling box chamber is an air cooling box chamber.