CN107138824B

CN107138824B - Discharging unit, welding device comprising discharging unit and welding method

Info

Publication number: CN107138824B
Application number: CN201710430668.3A
Authority: CN
Inventors: 张宝忠; 柯海挺; 刘志强; 毛海科; 郭康
Original assignee: Ningbo Sunny Instruments Co Ltd
Current assignee: Ningbo Sunny Instruments Co Ltd
Priority date: 2017-06-09
Filing date: 2017-06-09
Publication date: 2020-01-21
Anticipated expiration: 2037-06-09
Also published as: CN107138824A

Abstract

The invention relates to a discharging unit, a welding device comprising the discharging unit and a welding method, wherein the discharging unit comprises a main body, a nozzle and a heating device; the heating device comprises a positive electrode and a negative electrode, and the discharge ends of the positive electrode and the negative electrode are respectively positioned in the nozzle. By adopting the mode of heating the material by discharging, the material is heated and melted in the nozzle, and the area outside the nozzle is not affected, so that the damage of a welding device to the pin of the component is avoided in the welding process, and the quality of the component in the welding process is ensured. The mode of heating the material by discharging is adopted, the cost of the whole welding device is saved, the reliability of the welding process is high, and the failure rate is low. The mode of heating materials by discharging is adopted, the volume of the whole welding device is reduced, and therefore the device can be applied to the wider field.

Description

Discharging unit, welding device comprising discharging unit and welding method

Technical Field

The invention relates to the field of welding, in particular to a discharging unit, a welding device comprising the discharging unit and a welding method.

Background

Along with the rapid development of the electronic industry, electronic product components are smaller and more exquisite, the precision and the electronic integration degree are higher and higher, the requirements of the appearance, deformation and drawing force of internal structural components on welding technology are higher and higher, and more precise and faster welding modes are needed to meet various welding requirements.

The existing tin soldering process mainly comprises a soldering iron welding technology and a laser welding technology, the soldering iron welding heating time is long, and components are easy to deteriorate or lose efficacy after being heated.

For example, patent publication No. CN105458446A entitled "solder ball bonding apparatus" discloses a solution. The tin ball welding device comprises a tin ball implanting mechanism, a tin ball retaining mechanism and a welding laser head, wherein the tin ball retaining mechanism is arranged at one end of the welding laser head, and the tin ball implanting mechanism is used for conveying a tin ball into the tin ball retaining mechanism. The tin ball implanting mechanism comprises a tin ball placing seat, a tin ball separating component and a tin ball guide pipe, wherein the tin ball placing seat is provided with an accommodating groove for placing the tin ball, the tin ball separating component comprises a separating shaft and a rotary driving piece, the separating shaft is provided with a plurality of separating holes at intervals around the circumference corresponding to the accommodating groove, and the tin ball guide pipe is connected with the separating holes and the tin ball retaining mechanism. When the rotary driving member drives the separating shaft to rotate, the solder balls fall into the separating holes so as to be separated one by one and are sent to the solder ball holding mechanism through the solder ball guide tube. Because there is the problem that laser energy burns the components and parts welding pin easily in laser welding, and this kind of laser instrument design is complicated, and the price is too high, relies on the import at present basically. In addition, in the process of separating the solder balls, the solder balls fall into the guide tube by means of self gravity, and are easily clamped and accumulated in the solder ball guide tube, so that welding is affected.

In view of the above problems, no effective solution has been proposed.

Disclosure of Invention

The invention aims to provide a discharging unit, a welding device comprising the discharging unit and a welding method, which solve the problem that pins of components are easy to burn through and are quick and accurate in welding.

In order to achieve the above object, the present invention provides a discharging unit, comprising a main body, a nozzle, and a heating device; the heating device comprises a positive electrode and a negative electrode, and the discharge ends of the positive electrode and the negative electrode are respectively positioned in the nozzle;

the position of the discharge end of the positive electrode is higher than that of the discharge end of the negative electrode.

According to one aspect of the invention, the body and the nozzle have a first cavity in communication with each other;

one end of the first cavity close to the outlet of the nozzle is a conical cavity which is gradually reduced in the radial direction;

the discharge ends of the positive electrode and the negative electrode are respectively positioned in the conical cavities.

According to one aspect of the invention, the discharge end of the positive electrode and the discharge end of the negative electrode are separated from each other along the axial direction of the nozzle by a distance of 0 < L ≦ 3 mm.

According to one aspect of the invention, the discharge end of the positive electrode and the discharge end of the negative electrode form a central angle of 10-180 ° in the projection of the nozzle end.

A welding device comprises a storage unit, a transfer unit and a discharge unit; the discharging unit comprises a main body, a nozzle and a heating device; the heating device comprises a positive electrode and a negative electrode, and the discharge ends of the positive electrode and the negative electrode are respectively positioned in the nozzle;

According to one aspect of the invention, the transfer unit comprises a base, a drum and a fixed shaft rotatably connected to the drum.

According to one aspect of the invention, the roller is provided with at least one cavity and a first air channel which is arranged corresponding to the cavity and is communicated with the cavity;

the cavity can be communicated with the first cavity;

the fixed shaft is provided with a second air passage which can be communicated with the first air passage.

According to one aspect of the invention, the transfer unit is further provided with a first sensor for detecting the position of the drum, and a drive device for driving the drum in rotation.

According to one aspect of the invention, the storage unit comprises a bin, a fixed seat, an elastic piece connecting the bin and the fixed seat, and a vibration device for driving the bin to vibrate horizontally;

the whole feed bin is funnel-shaped, and it has the material way.

According to one aspect of the invention, the base is provided with a mounting hole which is nested with the lower end of the storage bin;

a gap is reserved between the outer side face of the lower end of the storage bin and the inner side face of the mounting hole;

when the roller rotates to the position that the cavity corresponds to the material channel, the material channel can be communicated with the cavity.

According to one aspect of the invention, the storage unit is located above the transfer unit, and the discharge unit is detachably connected to a lateral lower side of the transfer unit.

According to one aspect of the invention, the device further comprises a shielding gas unit;

the protective gas unit comprises a gas source and a protective gas nozzle;

the shielding gas nozzles are positioned on two sides of the nozzle.

According to one aspect of the invention, the shield gas nozzle is provided with at least one shield gas passage having an outlet located on a chamfer of an end of the shield gas nozzle;

the protective gas nozzle is also provided with an adjusting hole for adjusting the position.

According to one aspect of the invention, the gas source is in communication with the second gas passage;

the air source is communicated with the first cavity;

the main body is also provided with a second sensor for detecting the pressure in the first cavity.

A method of welding, comprising:

a) the storage unit enables the materials to fall to the transfer unit;

b) transferring the material to a discharging unit;

c) and controlling the positive electrode and the negative electrode of the heating device to discharge, heat and melt the material and send out to finish welding.

According to one aspect of the invention, in said step a), the material falls into a cavity on a drum in the transfer unit.

According to an aspect of the present invention, the step b) further comprises:

b1) rotating the roller, and detecting the in-place state by the first sensor and sending a signal;

b2) and controlling an air source to introduce protective gas into the second air passage, and conveying the material to the first cavity.

According to an aspect of the present invention, the step c) further comprises:

c1) delivering the material to an exit location of the nozzle;

c2) controlling the positive electrode and the negative electrode of the heating device to discharge and heat and melt the material;

c3) and conveying the melted materials to a welding position.

According to an aspect of the invention, in step c2), the second sensor detects the pressure rise in the first cavity and sends out a signal to control the discharge of the positive and negative electrodes of the heating device.

According to one aspect of the invention, in said step c3), the heated shielding gas is ejected to the welding location through a shielding gas passage on the shielding gas nozzle.

According to one aspect of the invention, the shielding gas is nitrogen.

According to the invention, the material is heated and melted in the nozzle by adopting a discharge material heating mode, and the area outside the nozzle is not affected, so that the damage of a welding device to the pin of the component is avoided in the welding process, and the quality of the component in the welding process is ensured. The mode of heating the material by discharging is adopted, the cost of the whole welding device is saved, the reliability of the welding process is high, and the failure rate is low. The mode of heating materials by discharging is adopted, the volume of the whole welding device is reduced, and therefore the device can be applied to the wider field. Meanwhile, the welding device is simpler in structure and is beneficial to maintenance. The material can be conveyed to the discharging unit continuously one by one to complete welding operation in the process of welding at every time under the action of the roller, the welding process is rapid and continuous, the materials are prevented from being overlapped or excessive, and the welding quality is further ensured.

According to the invention, along the axial direction of the nozzle, the discharge end of the positive electrode and the discharge end of the negative electrode are mutually separated, and the distance L is more than 0 and less than or equal to 3 mm. According to materials with different sizes, the distance between the discharge end of the positive electrode and the discharge end of the negative electrode is adjusted to meet the numerical range, and sufficient clearance is reserved between the discharge end of the positive electrode and the materials when the materials are conveyed to the outlet position of the nozzle. The arrangement ensures that the materials are fully heated and melted, and avoids the breakdown of the materials when the heating device carries out high-voltage discharge heating on the materials, thereby ensuring the welding quality in the welding process. Meanwhile, the arrangement also ensures that the high-voltage discharge of the electrode can be completely finished in the nozzle, avoids the influence of high-voltage electric arc on external components in the discharge process due to the fact that the electrode is too close to the outlet, and ensures the quality of the external components. The central included angle between the projection of the discharge end of the positive electrode and the projection of the discharge end of the negative electrode at the end part of the nozzle is 10-180 degrees. The arrangement ensures that the discharge between the positive electrode and the negative electrode can be completed fully and smoothly. The negative electrode can fully receive the high-voltage arc emitted by the positive electrode within the included angle of 10-180 degrees, and the discharge times of the positive electrode and the negative electrode are reduced. The welding efficiency of the invention is further improved, and the requirements of welding quality and rapid welding are ensured.

According to the welding device, the roller and the nozzle are detachable, materials with different sizes can be welded by replacing the roller and the nozzle, and the application range of the welding device is widened. Meanwhile, the roller and the nozzle are convenient and quick to replace, the cutting time is saved, and the working efficiency is improved.

According to the invention, the distance between the end of the positive electrode and the end of the negative electrode in the axial direction of the nozzle is greater than the diameter of the material. Therefore, the material can be prevented from being punctured when the heating device carries out high-voltage discharge heating on the material, and the welding quality of the welding process is ensured. The diameter of the conical cavity at the outlet of the nozzle is smaller than the diameter of the material. After the material is blown to the outlet position of the nozzle, the material is clamped at the outlet position of the nozzle.

According to the invention, the roller rotates relative to the fixed shaft, the cavity, the first air passage and the second air passage are communicated with each other, and the protective gas is introduced into the second air passage, so that the material in the cavity can be conveniently and quickly sent out to other working units, the material is effectively prevented from being adhered or clamped in the cavity, the material transported by the roller each time can enter the next working unit, and the stability and reliability of welding are further ensured.

According to the invention, the rotating position of the roller can be detected very conveniently and reliably through the first sensor, so that the materials can be accurately transferred in place. The rotating speed of the roller can be conveniently and accurately adjusted through the driving device, so that the material quasi-conveying speed is accurately controlled. The first sensor and the driving device can realize automatic control of the material transferring process, accurately and quickly transfer materials, and improve the efficiency of the material transferring device.

According to the invention, the shielding gas sprayed by the shielding gas nozzle is the heated shielding gas, so that the preheating of the welding position is facilitated, the good welding effect of the melted material at the welding position is ensured, and the situations of welding defects or insufficient welding and the like are avoided. Through the effect of nozzle, the welding zone is fully protected by the protective gas, has avoided the material after melting to be oxidized in welding process, has further guaranteed welded quality.

Drawings

FIG. 1 is a perspective view schematically illustrating a welding apparatus according to an embodiment of the present invention;

FIG. 2 is a perspective view schematically illustrating a welding apparatus according to an embodiment of the present invention;

FIG. 3 is a front cross-sectional view schematically illustrating a welding apparatus according to an embodiment of the present invention;

FIG. 4 is a side cross-sectional view schematically illustrating a welding apparatus according to one embodiment of the present invention;

fig. 5 is a perspective view schematically showing a discharging unit of a welding apparatus according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.

The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.

Fig. 1 is a perspective view schematically showing a welding apparatus according to an embodiment of the present invention.

As shown in fig. 1, according to an embodiment of the present invention, the welding apparatus includes: storage unit 1, transportation unit 2, ejection of compact unit 3 and protective gas unit 4. In the present embodiment, the stocker unit 1 is located above the transfer unit 2, and the discharge unit 3 is located laterally below the transfer unit 2. Wherein the storage unit 1, the transfer unit 2 and the discharge unit 3 are detachably connected with each other. The units are detachably connected, so that the replacement and the maintenance of the units are facilitated, the universality and the service life of the invention are improved, and the cost of the invention is reduced.

Fig. 2 is a perspective view schematically showing a welding apparatus according to an embodiment of the present invention.

Referring to fig. 1 and 2, according to an embodiment of the present invention, the stocker unit 1 includes a bin 11, an elastic member 12, a fixed seat 13, and a vibration device 14. In the present embodiment, the silo 11 has a funnel shape with a thick upper end and a thin lower end as a whole, and a material passage 111 penetrating the entire silo 11 is provided inside the silo 11. The part of the chute 111 located in the upper end of the silo 11 is mainly used for storing the material a, and the part of the chute 111 located in the lower end is an elongated channel allowing only a single row of material a to pass through. The bin 11 is fixedly connected with the fixed seat 13 through the elastic piece 12. In the present embodiment, the elastic member 12 is a thin plate-shaped spring piece, and the elastic member 12 is attached to both sides of the magazine 11. The silo 11 can swing back and forth horizontally under the action of the elastic member 12, so that the material a in the silo 11 can move downwards along the material channel 111. The elastic piece 12 adopts a sheet-shaped spring piece to limit the displacement of the stock bin 11 in the vertical direction, so that the stock bin 11 can keep horizontal vibration, and the smooth and stable falling of the material A is guaranteed. Through the arrangement, the accumulation of the material A at the outlet position of the material channel 111 is avoided, and the stability of the material conveying of the transfer unit 2 is ensured. The vibration device 14 is installed on the bin 11, and the bin 11 is driven by the vibration device 14 to swing left and right in the horizontal direction. The vibration frequency and the vibration amplitude of the bin 11 can be conveniently and accurately controlled by arranging the vibration device 14, and the quantity of falling of the materials A is favorably controlled. In this embodiment, the material A may be a solder ball.

Fig. 3 is a front sectional view schematically showing a welding apparatus according to an embodiment of the present invention.

Referring to fig. 2 and 3, according to an embodiment of the present invention, the transfer unit 2 includes a base 21, a roller 22, and a fixed shaft 23. In this embodiment, the base 21 is detachably interconnected with the fixed seat 13, and the base 21 is located below the silo 11. The base 21 is provided with a mounting hole 212, and the thinner end of the bin 11 at the lower end is inserted into the mounting hole 212. A gap is reserved between the outer side face of one end, inserted into the mounting hole 212, of the storage bin 11 and the inner side face of the mounting hole 212, so that the storage bin 11 can horizontally swing, and the interference of the base 21 on the swing of the storage bin 11 is avoided.

Fig. 4 is a side sectional view schematically showing a welding apparatus according to an embodiment of the present invention.

Referring to fig. 2 and 3, according to an embodiment of the present invention, the drum 22 and the fixed shaft 23 are coaxially installed with each other on the base 21. Referring to fig. 4, in the present embodiment, the drum 22 is detachably supported on the base 21 by a rotary member such as a rolling bearing. The roller 22 is provided with a groove matched with the fixed shaft 23 in the axial direction, and the fixed shaft 23 and the groove arranged on the roller 22 are nested with each other. The drum 22 is freely rotatable relative to the fixed shaft 23. At least one cavity 221 for transferring the material a is provided on the drum 22. The size of the cavity 221 is matched to the material a to be handled. The cavities 221 may be arranged in two, three or more. When there is more than one cavity 221, the cavities 221 are arranged in the circumferential direction of the drum 22. In this embodiment, the drum 22 is provided with a first air duct 222 corresponding to the cavity 221, one end of the first air duct 222 is communicated with the cavity 221, and the other end extends into a groove where the drum 22 and the fixed shaft 23 are nested with each other. The stationary shaft 23 is provided with a second air passage 231. The drum 22 rotates relative to the fixed shaft 23, and the first air path 222 provided at the drum 22 and the second air path 231 communicate with each other, thereby communicating the cavity 221, the first air path 222, and the second air path 231 with each other. In the present embodiment, the roller 22 is located below the silo 11, and by rotating the roller 22, the cavity 221 can be communicated with the material channel 111, that is, the cavity 221 is located below the outlet position of the material channel 111 at the bottom end of the silo 11. Through the arrangement, the materials A falling from the material channel 111 can fall into the cavity 221 smoothly and accurately, so that the roller 22 achieves the purpose of transferring the materials A. The cavities 221 are adapted to the materials a, which is beneficial to each cavity 221 on the drum 22 to convey only one material a, and ensures the accuracy of the amount of the conveyed materials a. The relative fixed axle 23 of cylinder 22 rotates, and cavity 221, first air flue 222 and second air flue 231 communicate each other, let in the protective gas in to second air flue 231, just can convenient and fast send out the material A in the cavity 221 to other work units, effectively avoided material A by the adhesion or block in cavity 221, guaranteed that the material A of cylinder 22 at every turn transporting can both get into next work unit, further guaranteed welded stability and reliable.

As shown in connection with fig. 2 and 3, according to an embodiment of the invention, the transfer unit 2 is further provided with a first sensor 24 and a drive device 25. In the present embodiment, the first sensor 24 is mounted on the base 21, the first sensor 24 is located below the roller 22, and the first sensor 24 is used to detect the position of rotation of the roller 22. When the first sensor 24 detects that the drum 22 is rotated to the right position, a signal is sent, and the air source communicated with the second air channel 231 sends shielding air into the second air channel 231. The position of the rotation of the drum 22 can be detected very easily and reliably by the first sensor 24, so that the material a can be accurately transferred to the position. Whether the material A in the cavity 221 is sent out can be detected through the first sensor 24, the situation that the material A is detained in the cavity 221 is avoided, and the normal operation of the device is further ensured. In the present embodiment, the first sensor 24 may be an optical fiber sensor. In the present embodiment, the driving means 25 is detachably connected with the fixing base 13, and the driving means 25 is detachably connected with the drum 22. The driving device 25 drives the roller 22 to rotate, and the roller 22 is used for conveying the material A. The driving device 25 can conveniently and accurately adjust the rotating speed of the roller 22, thereby accurately controlling the transferring speed of the material A. The first sensor 24 and the driving device 25 can realize automatic control of the material A transferring process of the invention, realize accurate and rapid material A transferring and improve the efficiency of the invention. In the present embodiment, the driving device 25 may be a motor.

Referring to fig. 2 and 3, according to an embodiment of the present invention, the discharging unit 3 includes a body 31, a nozzle 32, and a heating device 33. In the present embodiment, the main body 31 and the nozzle 32 are detachably connected to each other. The body 31 and the nozzle 32 have a first cavity 311 communicating with each other. The end of the first cavity 311 near the outlet of the nozzle 32 (i.e., the lower end of the nozzle 32 as shown in fig. 3) is a tapered cavity 311a, and the tapered cavity 311a is radially gradually reduced from the end far away from the outlet of the nozzle 32 to the end near the outlet of the nozzle 32. The heating device 33 includes a positive electrode 331 and a negative electrode 332. In the present embodiment, the discharge ends of the positive electrode 331 and the negative electrode 332 are respectively located in the tapered cavity 311a inside the nozzle 32, and the ends of the discharge ends of the positive electrode 331 and the negative electrode 332 are flush with the inner side surface of the tapered cavity 311 a. As shown in fig. 3, the positive electrode 331 and the negative electrode 332 are disposed oppositely, and the position of the discharge end of the positive electrode 331 is located above the position of the discharge end of the negative electrode 332 in the tapered cavity 311a in the axial direction (i.e., the vertical direction in the drawing) of the nozzle 32. The distance between the ends of the positive electrode 331 and the negative electrode 332 is greater than the diameter of the material a. In the present embodiment, the discharge end of the positive electrode 331 and the discharge end of the negative electrode 332 are separated from each other along the axial direction of the nozzle 32 by a distance of 0 < L ≦ 3 mm. According to the materials A with different sizes, the distance between the discharge end of the positive electrode 331 and the discharge end of the negative electrode 332 is adjusted to meet the numerical range, so that when the materials A are conveyed to the outlet position of the nozzle 32, a sufficient gap is reserved between the discharge end of the positive electrode 331 and the materials A. The arrangement ensures that the material A is fully heated and melted, and avoids the material A from being punctured when the heating device 33 carries out high-voltage discharge heating on the material A, thereby ensuring the welding quality of the welding process. Meanwhile, the arrangement ensures that the high-voltage discharge of the electrode can be completely finished in the nozzle 32, avoids the influence of high-voltage electric arc on external components in the discharge process due to the fact that the electrode is too close to the outlet, and ensures the quality of the external components. In the present embodiment, the center angle between the projection of the discharge end of the positive electrode 331 and the discharge end of the negative electrode 332 at the end of the nozzle 32 is 0-180 °. The arrangement ensures that the discharge between the positive electrode and the negative electrode can be completed fully and smoothly. The negative electrode can fully receive the high-voltage arc emitted by the positive electrode within the included angle range of 0-180 degrees, and the discharge times of the positive electrode and the negative electrode are reduced. The welding efficiency of the invention is further improved, and the requirements of welding quality and rapid welding are ensured.

As shown in fig. 3, the cavity 221 and the first cavity 311 may communicate with each other according to an embodiment of the present invention. In the present embodiment, the body 31 and the base 21 are provided with a passage through which the cavity 221 and the first cavity 311 can communicate with each other. The drum 22 rotates relative to the fixed shaft 23, the cavity 221, the first air passage 222 and the second air passage 231 communicate with each other, and at the same time, the cavity 221 and the first cavity 311 communicate with each other. Protective gas is introduced into the second gas duct 231, and the material a in the cavity 221 is fed into the first cavity 311. In this embodiment, the first cavity 311 is connected to a source of shielding gas, and the shielding gas is always circulated in the first cavity 311. After the material a is sent to the first cavity 311, the material a is blown to the outlet position of the nozzle 32 by the protective gas circulating in the first cavity 311. In the present embodiment, the diameter of the tapered cavity 311a at the outlet position of the nozzle 32 is smaller than the diameter of the material a. After the material A is blown to the outlet position of the nozzle 32, the material A is stuck at the outlet position of the nozzle 32.

According to one embodiment of the present invention, a second sensor is provided on the body 31. In this embodiment, the second sensor is used to detect the pressure in the first cavity 311 on the body 31. When there is no material a in the first cavity 311, the pressure at which the shielding gas circulates in the cavity 311 is constant. When the material a is fed into the first cavity 311 and the material a is conveyed to the outlet position of the nozzle 32, the pressure of the shielding gas in the first cavity 311 is increased. The second sensor detects a pressure rise in the first cavity 311, i.e. material a is delivered in place. After the material a is conveyed to the position, the negative electrode 332 is positioned below the material a, the positive electrode 331 is positioned above the material a, and a distance is left between the positive electrode 331 and the material a. The positive electrode 331 and the negative electrode 332 of the heating device 33 discharge to melt the material a. The first cavity 311 is always communicated with the shielding gas, and after the material A is melted, the shielding gas in the first cavity 311 blows the melted material A out to the welding position.

Through the arrangement, the roller 22 and the nozzle 32 are detachable, the roller 22 and the nozzle 32 can be replaced to weld materials A of different sizes, and the application range of the welding device is widened. Meanwhile, the roller 22 and the nozzle 32 are convenient and quick to replace, the cutting time is saved, and the working efficiency is improved. According to the invention, the material A is heated and melted in the nozzle 32 by adopting a mode of heating the material A by electric discharge, and the area outside the nozzle is not influenced, so that the damage of a welding device to the pin of the component is avoided in the welding process, and the quality of the component in the welding process is ensured. The mode of heating the material A by discharging is adopted, the cost of the whole welding device is saved, the reliability of the welding process is high, and the failure rate is low. The mode of heating the material A by discharging is adopted, the volume of the whole welding device is reduced, and therefore the device can be applied to the wider field. Meanwhile, the welding device is simpler in structure and is beneficial to maintenance. Through the action of the roller 22, the materials A can be continuously conveyed to the discharging unit 3 one by one in each welding process to complete the welding operation, the welding process is rapid and continuous, the materials A are prevented from being overlapped or excessive, and the welding quality is further ensured.

Referring to fig. 2 and 5, according to an embodiment of the present invention, the welding apparatus of the present invention further includes a shielding gas unit 4. In the present embodiment, the shielding gas unit 4 includes a gas source and a shielding gas nozzle 41. The shielding gas nozzle 41 is communicated with a gas source. As shown in fig. 4, in the present embodiment, nozzles 41 are detachably mounted to both sides of the main body 31. The shielding gas nozzle 41 is provided with at least one shielding gas duct 411, and the outlet of the shielding gas duct 411 is located on a chamfered surface of the end of the nozzle 41. In the present embodiment, three shielding gas passages 411 are provided in the shielding gas nozzle 41, and the three shielding gas passages 411 are linearly arranged along a diagonal plane of the end portion of the shielding gas nozzle 41. The shielding gas nozzle 41 is further provided with an adjusting hole 412, and the mounting position of the shielding gas nozzle 41 on the main body 31 can be adjusted through the adjusting hole 412, so that the angle and the distance of the shielding gas nozzle 41 relative to the welding position can be accurately adjusted, and the shielding gas nozzle 41 can spray shielding gas in the welding area. In the embodiment, the shielding gas sprayed from the shielding gas nozzle 41 is high-temperature heated shielding gas, so that the welding position can be preheated, the melted material a can achieve a good welding effect at the welding position, and the conditions of welding defects or insufficient welding and the like are avoided. Through the effect of nozzle 41, the welding area is fully protected by the protective gas, has avoided the material A after melting to be oxidized in welding process, has further guaranteed the welded quality.

To describe the welding method of the present invention in detail, a welding apparatus according to an embodiment of the present invention will be specifically described.

The welding method of the welding device according to the present invention includes:

the method comprises the following steps: the driving vibration device 14 drives the bin 11 to horizontally vibrate back and forth, and the material a in the bin 11 falls down to the cavity 221 on the drum 22 along the material channel 111.

Step two: after the material a falls into the cavity 221, the driving device 24 drives the roller 22 to rotate, and the cavity 221 containing the material a also rotates along with the material a. After the drum 22 rotates to a position where the cavity 221 and the first cavity 311 communicate with each other, the first sensor 24 detects the position of the drum 22. The second sensor 22 detects a signal, and the gas source communicated with the second gas channel 231 feeds shielding gas into the second gas channel 231. The shielding gas transports the material a in the cavity 221 to the first cavity 311 through the second gas duct 231 and the first gas duct 222.

Step three: the first cavity 311 is also in communication with a source of shielding gas, and after material a is delivered into the first cavity 311, material a is delivered by shielding gas to the exit location of the nozzle 32. Material a is caught by the outlet position of nozzle 32 and the pressure of the shielding gas in first cavity 311 rises. The second sensor detects the pressure rise in the first cavity 311 and sends out a signal, and the discharge ends of the positive electrode 331 and the negative electrode 332 of the heating device 33 discharge to melt the material a at the outlet position of the nozzle 32. The shielding gas in the first cavity 311 blows the melted material a to the welding position, thereby enabling the material a to be welded at the welding position.

The apparatus and structures not specifically described herein are understood to be implemented using conventional equipment and methods well known in the art.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding device comprises a storage unit (1), a transfer unit (2) and a discharge unit (3); the discharging unit (3) comprises a main body (31), a nozzle (32) and a heating device (33); characterized in that the heating device (33) comprises a positive electrode (331) and a negative electrode (332), the discharge ends of the positive electrode (331) and the negative electrode (332) being respectively located in the nozzle (32);

the discharge end of the positive electrode (331) is higher than the discharge end of the negative electrode (332);

the body (31) and the nozzle (32) have a first cavity (311) communicating with each other;

the transfer unit (2) comprises a base (21), a roller (22) and a fixed shaft (23) rotatably connected with the roller (22);

the drum (22) is at least provided with a cavity (221) and a first air channel (222) which is arranged corresponding to the cavity (221) and is communicated with the cavity;

said cavity (221) being intercommunicable with said first cavity (311);

the fixed shaft (23) is provided with a second air passage (231) which can be mutually communicated with the first air passage (222).

2. Welding device according to claim 1, characterized in that the end of the first cavity (311) close to the outlet of the nozzle (32) is a radially tapered cavity (311 a);

the discharge ends of the positive electrode (331) and the negative electrode (332) are respectively positioned in the conical cavities (311 a).

3. Welding device according to claim 1, wherein the transfer unit (2) is further provided with a first sensor (24) for detecting the position of the drum (22), and with drive means (25) for driving the drum (22) in rotation.

4. Welding device according to claim 1, wherein the storage unit (1) comprises a magazine (11), a holder (13), a spring (12) connecting the magazine (11) and the holder (13), and a vibration device (14) for driving the magazine (11) to vibrate horizontally;

the feed bin (11) is integrally funnel-shaped and is provided with a material channel (111).

5. The welding device according to claim 4, characterized in that the base (21) is provided with a mounting hole (212) which is nested with the lower end of the storage bin (11);

a gap is reserved between the outer side face of the lower end of the storage bin (11) and the inner side face of the mounting hole (212);

when the roller (22) rotates to the position that the cavity (221) corresponds to the material channel (111), the material channel (111) can be communicated with the cavity (221).

6. Welding device according to claim 5, wherein the storage unit (1) is located above the transfer unit (2), and the discharge unit (3) is detachably connected below the side of the transfer unit (2).

7. Welding device according to claim 1, further comprising a shielding gas unit (4);

the shielding gas unit (4) comprises a gas source and a shielding gas nozzle (41);

the shielding gas nozzles (41) are located on both sides of the nozzle (32).

8. Welding device according to claim 7, wherein the shield gas nozzle (41) is provided with at least one shield gas channel (411) with an outlet on a chamfer of the end of the shield gas nozzle (41);

the shielding gas nozzle (41) is also provided with an adjusting hole (412) for adjusting the position.

9. Welding device according to claim 7, wherein said gas source is in communication with said second gas duct (231);

the gas source is communicated with the first cavity (311);

the main body (31) is also provided with a second sensor for detecting the pressure in the first cavity (311).

10. Welding device according to claim 2, characterized in that the discharge ends of the positive electrode (331) and the negative electrode (332) are separated from each other in the axial direction of the nozzle (32) by a distance of 0 < L ≦ 3 mm.

11. Welding device according to claim 10, wherein the centre angle between the projection of the discharge end of the positive electrode (331) and the discharge end of the negative electrode (332) at the end of the nozzle (32) is 10 ° -180 °.

12. A welding method using the welding apparatus of any one of claims 1 to 11, comprising:

a) the storage unit (1) enables the materials (A) to fall to the transfer unit (2);

b) transferring the material (A) to a discharging unit (3);

c) and controlling a positive electrode (331) and a negative electrode (332) of the heating device (33) to discharge, heat and melt the material (A) and send out to finish welding.

13. Welding method according to claim 12, wherein in step a) the material (a) falls into a cavity (221) on a drum (22) in the transfer unit (2).

14. The welding method of claim 13, further comprising in step b):

b1) a rotating drum (22), a first sensor (24) detects the position and sends out a signal;

b2) and controlling the air source to introduce protective gas into the second air channel (231) to convey the material (A) to the first cavity (311).

15. The welding method of claim 14, further comprising in step c):

c1) delivering the material (A) to an outlet location of the nozzle (32);

c2) controlling a positive electrode (331) and a negative electrode (332) of the heating device (33) to discharge and heat and melt the material (A);

c3) conveying the melted material (A) to a welding position.

16. Welding method according to claim 15, wherein in step c2) the second sensor detects the pressure increase in the first cavity (311) and sends a signal to control the discharge of the positive (331) and negative (332) electrodes of the heating device (33).

17. Welding method according to claim 16, wherein in step c3) the heated shielding gas is ejected to the welding location through a shielding gas channel (411) on the shielding gas nozzle (41).

18. The welding method of claim 17, said shielding gas being nitrogen.