CN115971600A

CN115971600A - Soldering head for soldering and soldering device

Info

Publication number: CN115971600A
Application number: CN202211651622.1A
Authority: CN
Inventors: 巩蕊; 成林星; 宋粤伟; 刘�文
Original assignee: Suzhou Wisdom Valley Laser Intelligent Equipment Co Ltd
Current assignee: Suzhou Wisdom Valley Laser Intelligent Equipment Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-04-18

Abstract

The invention relates to the technical field of welding devices, and discloses a welding head for tin-adding welding and a welding device. A bonding tool for soldering includes: the welding head can move on an X axis, a Y axis and a Z axis so as to move to a welding position on the junction box, a tin wire can be adhered to the bottom end surface of the welding head, and the welding head can be heated to a preset temperature; and the thermocouple sensor is fixedly connected with the welding head and is positioned on one side of the welding head, the measuring end of the thermocouple sensor is positioned above the bottom end face of the welding head, the distance H between the measuring end of the thermocouple sensor and the bottom end face of the welding head is 3-20 mm, and the thermocouple sensor is used for detecting the heating temperature of the welding head. The welding head for tin-adding welding can prolong the service life of the welding head and reduce the frequency of replacing the welding head, thereby shortening the shutdown time of the whole machine and reducing the welding cost.

Description

Soldering head for soldering and soldering device

Technical Field

The invention relates to the technical field of welding devices, in particular to a welding head for tin-adding welding and a welding device.

Background

At present, in order to ensure the welding quality between the bus bar and the junction box in the photovoltaic module, a tin adding welding mode is generally adopted, namely, a welding head is heated during welding, and tin wires adhered to the bottom end surface of the welding head are melted by heat to weld. Wherein the heating temperature of the butt joint is detected by a sensor.

However, when the current sensor is disposed on the welding head, the detection position of the sensor on the welding head is not usually considered, so that the sensor cannot accurately detect the actual heating temperature of the welding head, which results in a large difference between the detection value of the sensor and the actual heating temperature of the welding head, the actual heating temperature of the welding head is high, and the detection value is equal to the preset heating temperature value, which results in the welding head being in a state of high heat and high temperature, thereby affecting the service life of the welding head, increasing the frequency of replacing the welding head, and further resulting in long downtime of the whole machine and high welding cost.

Therefore, a soldering tip and a soldering apparatus for soldering are required to solve the above problems.

Disclosure of Invention

An object of the present invention is to provide a bonding head for soldering which can improve the service life of the bonding head and reduce the frequency of replacement of the bonding head.

In order to achieve the purpose, the invention adopts the following technical scheme:

a bonding tool for soldering, comprising:

the welding head can move on an X axis, a Y axis and a Z axis so as to move to a welding position on the junction box, a tin wire can be adhered to the bottom end surface of the welding head, and the welding head can be heated to a preset temperature;

the thermocouple sensor is fixedly connected with the welding head and located on one side of the welding head, the measuring end of the thermocouple sensor is located above the bottom end face of the welding head, the distance H between the measuring end of the thermocouple sensor and the bottom end face of the welding head is 3-20 mm, and the thermocouple sensor is used for detecting the heating temperature of the welding head.

Further, the distance H between the measuring end of the thermocouple sensor and the bottom end face of the welding head is 5mm.

Further, the thermocouple sensor is fixedly connected to the welding head through a plurality of bending plates.

Furthermore, a wiring groove is further formed in the welding head and used for installing a connecting wire on the thermocouple sensor.

Furthermore, a clamping groove is formed in the bottom end face of the welding head, an insert is clamped in the clamping groove, the insert can be adhered to the molten tin wire, and after the insert is clamped in the clamping groove, a tin wire placing groove is formed in the portion, located below the insert, of the clamping groove.

Further, the welding head is made of a molybdenum alloy material.

Another object of the present invention is to provide a welding device that allows a short downtime of the whole machine and a low welding cost.

a welding device including the above-described welding head for solder addition welding, the welding head being capable of rotating about a Z-axis, the welding device further including:

the heating assembly is used for heating the welding head so that the welding head reaches the preset temperature;

the welding head comprises a first driving piece, a second driving piece, a third driving piece and a fourth driving piece, wherein the first driving piece is used for driving the welding head to rotate around a Z axis, and the second driving piece, the third driving piece and the fourth driving piece are respectively used for driving the welding head to move along an X axis, a Y axis and the Z axis.

Further, welding set still includes water-cooling spare for water-cooling the soldered connection, the water-cooling spare includes:

one end of the first metal piece is fixedly connected with the welding head;

the cooling structure comprises a second metal piece and a plurality of flow channels extending along the Z axis, the other end of the first metal piece is fixedly connected to the second metal piece, the flow channels are arranged on the inner side of the second metal piece at intervals and in parallel, and cooling water flows in the flow channels.

Further, the welding device further comprises an air cooling member for air-cooling the welding head, the air cooling member moves along with the movement of the welding head, and the air cooling member comprises:

the air pipe flows with cold air in the air pipe, an air outlet of the air pipe is positioned on one side of the welding head, and the air pipe is used for blowing the cold air to the welding head.

Further, the welding device further includes:

a CCD camera for detecting the welding position on the junction box before welding and the welding spot at the welding position after welding.

The invention has the beneficial effects that:

moving a welding head on an X axis, a Y axis and a Z axis so that the welding head can accurately move to a welding position and cover the welding position, heating the welding head to a preset temperature so as to melt a tin wire at the welding position on the welding head, then stopping heating and cooling the welding head so as to solidify the tin wire melted at the welding position, and thus completing tin-adding welding between the bus bar and the junction box; meanwhile, the thermocouple sensor is fixedly connected with the welding head and is positioned on one side of the welding head, the measuring end of the thermocouple sensor is positioned above the bottom end face of the welding head, and the distance H between the measuring end of the thermocouple sensor and the bottom end face of the welding head is 3-20 mm.

Drawings

FIG. 1 is a schematic view of a welding head according to the present invention;

FIG. 2 is a schematic view of a welding apparatus provided by the present invention;

FIG. 3 is a comparative schematic of the life of the various weld joints at different spacings H provided by the present invention;

FIG. 4 is a side view of a welding apparatus provided by the present invention;

FIG. 5 is a schematic view of an assembly structure of the first driving member, the second driving member and the welding head according to the present invention;

fig. 6 is a partially enlarged schematic view at a in fig. 5.

Reference numerals:

1-welding a head; 111-a snap groove; 112-tin wire placing groove; 2-a heating assembly; 3-a CCD camera; 4-a pressing component; 41-guide column; 42-an elastic member; 43-a platen; 44-fixing block; 5-a first connection plate; 6-water cooling; 61-a first metal piece; 62-a second metal piece; 71-trachea; 8-an insert; 10-a first driving member; 11-a second connecting plate; 12-a second drive member; 13-a third connecting plate; 14-a third drive member; 15-a fourth connecting plate; 16-a fourth drive; 17-a thermocouple sensor; and (18) bending the plate.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation that the first and second features are not in direct contact, but are in contact via another feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the structures or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

At present, when a sensor is arranged on a welding head, the specific detection position of the sensor on the welding head is not usually considered, so that the sensor cannot accurately detect the actual heating temperature of the welding head, a large difference is formed between the detection value of the sensor and the actual heating temperature value of the welding head, the actual heating temperature value of the welding head is high easily, the detection value is equal to the preset heating temperature value at the moment, the welding head is easily in a high-temperature state, the service life of the welding head is influenced, the frequency of replacing the welding head is high, and further the whole machine of the welding head for tin adding welding is long in downtime and high in welding cost.

Example one

For this purpose, the present embodiment proposes a soldering tip for soldering, which includes a soldering tip 1 and a thermocouple sensor 17, as shown in fig. 1 and 2; the welding head 1 can move on an X axis, a Y axis and a Z axis, so that the welding head 1 can move to a welding position on the junction box for welding, and a tin wire can be adhered to the bottom end face of the welding head 1; the welding head 1 can be heated to a preset temperature, so that tin wires adhered to the bottom end face of the welding head 1 can be hot-melted for tin adding welding; the thermocouple sensor 17 is fixedly connected with the welding head 1 and is positioned on one side of the welding head 1, the measuring end of the thermocouple sensor 17 is positioned above the bottom end face of the welding head 1, the distance H between the measuring end of the thermocouple sensor 17 and the bottom end face of the welding head 1 is 3mm-20mm, and the thermocouple sensor 17 is used for detecting the heating temperature of the welding head 1. The spacing H is specifically shown as reference H in fig. 1, and the X-axis, the Y-axis, and the Z-axis are specifically shown as arrows in fig. 2.

The welding head 1 can accurately move to the welding position and cover the welding position by moving the welding head 1 on the X axis, the Y axis and the Z axis, the welding head 1 is heated to a preset temperature, so that the tin wire at the welding position on the welding head 1 is melted, then the heating is stopped, and the welding head 1 is cooled, so that the tin wire melted at the welding position is solidified, and the tin adding welding between the bus bar and the junction box is completed. In this embodiment, the bus bar is welded to the junction box, which is a common assembly means of the photovoltaic module in the prior art, and therefore, the detailed description of the specific welding principle between the bus bar and the junction box is omitted here.

The welding head for tin-adding welding in the present embodiment takes into account the detection position of the thermocouple sensor 17 on the welding head 1, as compared with the prior art; by making the distance H between the measuring end of the thermocouple sensor 17 and the bottom end face of the welding head 1 be 3mm-20mm, the position can make the thermocouple sensor 17 more accurately detect the actual heating temperature of the welding head 1, so that the detection value of the thermocouple sensor 17 is basically equal to the actual heating temperature of the welding head 1, the problem that the actual heating temperature value of the welding head 1 is higher, and the detection value of the thermocouple sensor 17 is equal to the preset heating temperature value at the moment can not occur, thereby avoiding that the welding head 1 is always in a high-temperature state, so as to prolong the service life of the welding head 1, reduce the frequency of replacing the welding head 1, and further make the overall machine downtime of the welding head for tin adding welding shorter and the welding cost lower.

Specifically, as shown in fig. 3, when the distance H between the measuring end of the thermocouple sensor 17 and the bottom end surface of the bonding head 1 is set to a range other than 3mm to 20mm, that is, H < 3mm or H > 20mm, the average service life of the bonding head 1 is 22706 times; in the embodiment, the service life of the welding heads 1 with three different distances H is tested and verified; wherein, the three different intervals H are respectively H =3mm, H =5mm and H =8mm; when H =3mm, that is, when the distance between the measuring end of the thermocouple sensor 17 and the bottom end surface of the welding head 1 is 3mm, the welding head 1 sends a replacement alarm after the welding is performed for 63500 times, that is, the welding head 1 is damaged at this time, and the welding head 1 needs to be replaced; when H =5mm, that is, when the distance between the measuring end of the thermocouple sensor 17 and the bottom end surface of the welding head 1 is 5mm, the welding head 1 sends a replacement alarm after the welding is performed for 64520 times, that is, the welding head 1 is damaged at this time, and the welding head 1 needs to be replaced; when H =8mm, that is, when the distance between the measuring end of the thermocouple sensor 17 and the bottom end surface of the welding head 1 is 8mm, the welding head 1 issues a replacement alarm after the number of times of welding is 62255, that is, the welding head 1 is damaged at this time, and the welding head 1 needs to be replaced.

As shown in fig. 3, it can be obtained from the above test procedure that setting the distance H between the measuring end of the thermocouple sensor 17 and the bottom end face of the bonding head 1 to be in the range of 3mm to 20mm can improve the average service life of the bonding head 1 to about 6 ten thousand times, and can improve the service life of the bonding head 1 by at least about 2 to 3 times in the present embodiment, as compared to setting the distance H between the measuring end of the thermocouple sensor 17 and the bottom end face of the bonding head 1 to be out of the range of 3mm to 20mm at present.

In this embodiment, as shown in fig. 3, the distance H between the measuring end of the thermocouple sensor 17 and the bottom end surface of the welding head 1 may be preferably 5mm, so that the welding head 1 can obtain a long service life to the maximum extent, the replacement frequency of the welding head 1 can be reduced to the maximum extent, and the overall machine has high working efficiency.

Further, as shown in fig. 1, the thermocouple sensor 17 is fixedly connected to the welding head 1 by a plurality of bending plates 18, that is, the bending plates 18 can press the thermocouple sensor 17 against the side surface of the welding head 1, and both ends of the bending plates 18 are fixedly connected to the welding head 1, thereby fixing the thermocouple sensor 17 to the welding head 1. Among them, the plurality of bending plates 18 are provided at intervals, so that the thermocouple sensor 17 can be relatively stably fixed to the bonding head 1. In this embodiment, two bending plates 18 are provided. The specific structure and size of the bending plate 18 are not limited, as long as the thermocouple sensor 17 can be fixed to the welding head 1 through the bending plate 18.

Specifically, the bonding head 1 is further provided with a wiring groove for mounting a connection wire on the thermocouple sensor 17 so that the connection wire on the thermocouple sensor 17 can be collectively summarized. Wherein, the welding head 1 is made of molybdenum alloy material, and the molybdenum alloy has the characteristics of rapid heating and temperature rise, small temperature error, wear resistance and small heating deformation. In other embodiments, the welding head 1 may be made of other materials, which is not limited herein.

Further, as shown in fig. 1, a clamping groove 111 is formed in the bottom end surface of the welding head 1, an insert 8 is clamped in the clamping groove 111, and the insert 8 can stick to the molten tin wire, so that the tin wire can be conveniently taken up; and after establishing insert 8 card in joint groove 111, the part that lies in insert 8 below in joint groove 111 forms tin silk standing groove 112, and tin silk standing groove 112 can provide the space that can place to can hold the tin silk in tin silk standing groove 112. The insert 8 may be made of a tin-bondable material, so as to better bond the tin wire.

Example two

The embodiment provides a welding device, which comprises a welding head for tin-adding welding in the first embodiment; specifically, as shown in fig. 2 and 4, the welding apparatus further includes a water cooling member 6 for water-cooling the welding head 1; the water cooling member 6 comprises a first metal member 61, a second metal member 62 and a plurality of flow channels extending along the Z axis; one end of the first metal piece 61 is fixedly connected with the welding head 1, the other end of the first metal piece 61 is fixedly connected to the second metal piece 62, a plurality of flow channels are arranged at intervals and in parallel at the inner side of the second metal piece 62, and cooling water flows in the flow channels. Each flow channel may be integrally formed on the inner side of the second metal part 62, or may be disposed on the inner side of the second metal part 62 in a split structure.

Specifically, when the welding head 1 needs to be water-cooled, the cooling water in each flow passage can absorb the heat transferred from the first metal part 61 to the second metal part 62, so as to reduce the heat on the welding head 1 connected to the first metal part 61, thereby achieving the purpose of water-cooling the welding head 1.

It is worth to be noted that, in the whole welding process, the welding head 1 needs to be cooled twice, the first cooling is performed when the welding head 1 adheres to the tin wire, that is, after the welding head 1 is heated for the first time, the insert 8 clamped on the bottom end face of the welding head 1 can be heated to stick up the tin wire with the surface melted, and then the welding head 1 is rapidly cooled for the first time, so that the insert 8 and the tin wire can be solidified into a whole, and the tin wire is adhered to the bottom end face of the welding head 1; the cooling of the second time is when soldered connection 1 welds, and when soldered connection 1 descended to covering the welding position completely along the Z axle promptly, carry out the second time to soldered connection 1 and heat to make the tin wire on the insert 8 carry out quick hot melt and overflow to the welding position, then carry out the quick cooling of second time to soldered connection 1 again, thereby make the tin wire of welding position department can solidify fast, in order to accomplish welding work.

Furthermore, the welding device also comprises an air cooling piece, wherein the air cooling piece is used for carrying out air cooling on the welding joint 1 and moves along with the movement of the welding joint 1; as shown in fig. 2 and 4, the air cooling member includes an air pipe 71, the air pipe 71 has cold air flowing therein, and an air outlet of the air pipe 71 is located at one side of the welding head 1, and the air pipe 71 blows the cold air to the welding head 1. The air pipe 71 is bent, so that the air outlet of the air pipe 71 can be ensured to be over against one side of the welding head 1 while the air pipe 71 does not interfere with other structures in the welding device, and the cooling effect of an air cooling piece on the welding head 1 is good.

By arranging the water cooling piece 6 and the air cooling piece, the butt joint 1 can be simultaneously cooled by water and air, so that the butt joint 1 is better cooled, and the butt joint 1 can be rapidly cooled; meanwhile, the specific cooling mode of the butt joint 1 can be properly selected according to the actual cooling requirement, so that the cooling mode of the butt joint 1 is flexible.

Further, as shown in fig. 2 and 4, the welding device further comprises a CCD camera 3, the CCD camera 3 is used for detecting the specific position of the welding position on the terminal box before welding, so that the welding head 1 can be accurately moved to the welding position on the terminal box according to the detection result of the CCD camera 3; in addition, the CCD camera 3 is also used to detect the welding spot at the welding position after welding to detect the actual welding effect between the junction box and the bus bar; meanwhile, the CCD camera 3 can also detect the specific placement position of the tin wire, so that the welding head 1 can accurately move to the tin wire and adsorb the tin wire on the insert 8 on the bottom end face of the welding head 1.

Specifically, as shown in fig. 2 and 4, the welding device further includes a pressing component 4, the pressing component 4 is disposed on two opposite sides of the welding head 1, the pressing component 4 can move along with the movement of the welding head 1, the pressing component 4 is used for horizontally pressing the top end face of the junction box before the welding head 1 performs welding, and then the welding head 1 descends along the Z axis and covers the welding position to perform welding, so that the problem that the junction box is inclined or shaken in the whole welding process can be avoided, and the welding quality between the bus bar and the junction box can be ensured.

Further, as shown in fig. 5 and fig. 6, the welding head 1 can also rotate around the Z axis, the welding device further includes a first connecting plate 5, the second metal part 62 is fixedly disposed on the first connecting plate 5, the first connecting plate 5 can drive the welding head 1 to move on the X axis, the Y axis and the Z axis and rotate around the Z axis, that is, the first connecting plate 5 and the welding head 1 move synchronously; the abutting assembly 4 comprises a guide pillar 41, an elastic member 42, a fixing block 44 and a pressing plate 43, the fixing block 44 is fixedly connected to the first connecting plate 5 and located on one side of the welding head 1, one end of the guide pillar 41 is fixedly connected to the fixing block 44, one end of the pressing plate 43 is slidably connected with the other end of the guide pillar 41, the other end of the pressing plate 43 can extend towards the welding head 1, the elastic member 42 is sleeved on the guide pillar 41 and located between the fixing block 44 and the pressing plate 43, and the bottom end face of the pressing plate 43 is lower than that of the welding head 1, so that the pressing plate 43 can be horizontally and elastically pressed on the top end face of the junction box before the welding head 1.

Specifically, when the first connecting plate 5 drives the welding head 1 and the abutting assembly 4 to move to the welding position, the welding head 1 and the abutting assembly 4 continue to move downwards along the Z axis, and when the pressing plate 43 in the abutting assembly 4 moves horizontally and is elastically pressed on the top end surface of the junction box, the welding head 1 does not completely cover the welding position at this time; and then the welding head 1 and the abutting assembly 4 continuously move downwards along the Z-axis until the welding head 1 completely covers the welding position, in the process, the pressing plate 43 can move upwards along the Z-axis on the guide post 41 under the abutting action of the junction box to compress the elastic piece 42, so that the pressing plate 43 can be pressed on the top end surface of the junction box under the elastic force action of the elastic piece 42, and the junction box is further elastically abutted and pressed to be well protected. In this embodiment, the elastic member 42 may be a compression spring.

It should be noted that, after the welding is completed, in the process that the first connecting plate 5 drives the welding head 1 and the abutting assembly 4 to move upward along the Z axis, the welding head 1 may be separated from the junction box first with respect to the pressing plate 43, that is, in the whole process that the welding head 1 moves upward along the Z axis to be separated from the junction box, the pressing plate 43 may always abut against the junction box, so that the junction box may be prevented from being lifted upward under the action of the upward movement of the welding head 1 along the Z axis, and the junction box may not be deflected or shaken after the welding is completed.

Specifically, as shown in fig. 2 and 4, the welding device further includes a heating assembly 2, a first driving member 10, a second driving member 12, a third driving member 14, and a fourth driving member 16; the heating assembly 2 is used for heating the welding head 1, so that the welding head 1 can reach a preset temperature; the first driver 10 is used for driving the welding head 1 to rotate around the Z axis, and the second driver 12, the third driver 14 and the fourth driver 16 are used for driving the welding head 1 to move along the Z axis, the Y axis and the X axis respectively. In this embodiment, the heating assembly 2 may be a variable pressure heating mechanism or other heating mechanisms commonly used in the prior art, and is not limited herein.

Specifically, as shown in fig. 5 and 6, the driving end of the first driver 10 is drivingly connected to the first connecting plate 5, and the first driver 10 is used to drive the first connecting plate 5 and the bonding head 1 to rotate about the Z axis. In this embodiment, the first driving member 10 may be a rotating electrical machine. The configuration of the first driver 10 is not limited to this, and the bonding head 1 may be driven to rotate around the Z axis.

Through setting up first driving piece 10 and rotate around the Z axle with drive soldered connection 1 to realize the rotatory deviation rectification of soldered connection 1 for the welding position, so that soldered connection 1 can rotate again and weld after the suitable angle, thereby be favorable to guaranteeing ultimate welding effect.

Specifically, as shown in fig. 2 and 4, the welding device further includes a second connecting plate 11; the fixed end of the first driving piece 10 is arranged on the second connecting plate 11, the driving end of the second driving piece 12 is in driving connection with the second connecting plate 11, and the second driving piece 12 is used for driving the second connecting plate 11 and the welding head 1 to move along the Z axis; and one end of the air pipe 71 is fixedly connected with the second connecting plate 11, so that the air pipe 71 can be synchronous with the movement of the welding head 1, the air pipe 71 can be always positioned at one side of the welding head 1 in the movement process of the welding head 1, and the cold air in the air pipe 71 can be blown to the welding head 1. Wherein, the air pipe 71 can not rotate around the Z axis along with the welding head 1, and because a certain distance is provided between the air pipe 71 and the welding head 1 and the abutting assembly 4, the air pipe 71 can not be interfered when the welding head 1 and the abutting assembly 4 rotate around the Z axis, so as to ensure the normal use performance of the air pipe 71.

Further, as shown in fig. 2 and 4, the welding device further includes a third connecting plate 13; the fixed end of the second driving element 12 is arranged on the third connecting plate 13, the driving end of the third driving element 14 is in driving connection with the third connecting plate 13, and the third driving element 14 is used for driving the third connecting plate 13 and the welding head 1 to move along the Y axis.

Specifically, as shown in fig. 2 and 4, the welding device further includes a fourth connecting plate 15; the fixed end of the third driving member 14 is disposed on the fourth connecting plate 15, the driving end of the fourth driving member 16 is connected to the fourth connecting plate 15 in a driving manner, and the fourth driving member 16 is used for driving the fourth connecting plate 15 and the welding head 1 to move along the X axis.

Through the arrangement structure, the movement requirement of the welding head 1 can be met, and meanwhile, the structure of the whole welding device is compact, so that the occupied area of the welding device is small.

It should be noted that the second driving element 12, the third driving element 14, and the fourth driving element 16 may be a linear cylinder structure, a servo motor and screw rod transmission structure, or a servo motor and conveyor belt structure, and the specific structures of the second driving element 12, the third driving element 14, and the fourth driving element 16 are not limited as long as the welding head 1 can move in all directions. The specific configurations of the first connecting plate 5, the second connecting plate 11, the third connecting plate 13, and the fourth connecting plate 15 are not limited.

The specific welding process of the welding device in this embodiment is as follows:

firstly, after the tin wire is placed, the CCD camera 3 detects the specific position of the tin wire and feeds the position back to the first driving part 10, the second driving part 12, the third driving part 14 and the fourth driving part 16, so that the first driving part 10, the second driving part 12, the third driving part 14 and the fourth driving part 16 sequentially drive the welding head 1 to move above the tin wire in each direction; then the second driving piece 12 drives the welding head 1 to move downwards along the Z-axis direction until the tin wire is covered; simultaneously, the heating assembly 2 heats the welding head 1 for the first time, so that the tin wire is melted and adhered to the insert 8 on the welding head 1, and then the heating is stopped. Here, the heating temperature of the butt joint 1 is only required to be high enough to ensure melting of the surface of the tin wire.

And then, simultaneously carrying out primary cooling on the welding joint 1 through the water cooling piece 6 and the air cooling piece so as to enable the tin wire to be rapidly cooled and then to be solidified with the insert 8 into an integrated structure, and then enabling the welding joint 1 to move upwards and rise along the Z-axis direction so as to finish the adhesion of the tin wire.

Then, the CCD camera 3 detects a specific welding position and feeds back the detected welding position to the first driving member 10, the second driving member 12, the third driving member 14 and the fourth driving member 16, so that the first driving member 10, the second driving member 12, the third driving member 14 and the fourth driving member 16 sequentially drive the welding head 1 to move in all directions to above the welding position.

Then, the second driving part 12 drives the welding head 1 to further descend along the Z axis, at this time, the pressing plate 43 of the abutting assembly 4 also descends along the Z axis along with the welding head 1, and the pressing plate 43 contacts the junction box before the welding head 1 in the descending process; then, the pressing plate 43 is continuously lowered to enable the pressing plate 43 to compress the elastic piece 42 upwards under the abutting action of the junction box, so that the pressing plate 43 can be horizontally and elastically pressed on the top end surface of the junction box under the elastic acting force of the elastic piece 42; simultaneously the welding head 1 can be lowered to completely cover the welding position and the heating assembly 2 is caused to heat the welding head 1 a second time to melt the tin wire at the welding position, then the heating is stopped and the welding head 1 is cooled a second time, and the welding head 1 is rapidly cooled by the water cooling member 6 and the air cooling member 8 simultaneously until the tin wire at the welding position solidifies.

Then, after welding is finished, the welding head 1 is lifted upwards along the Z axis, and meanwhile, the heating assembly 2 heats the welding head 1 for the third time, so that the insert 8 of the welding head 1 is hot-melted with the contact surface of the welding position, and the welding head 1 can be favorably and smoothly separated from the welding point; in addition, in the process of rising upwards, the pressing plate 43 of the pressing assembly 4 will be separated from the terminal box at the soldering head 1, that is, after the soldering head 1 is separated from the terminal box upwards, the pressing plate 43 is pressed against the top end surface of the terminal box at this time, so as to ensure that the terminal box is not brought up by the upward rising force of the soldering head 1 after the soldering is completed.

Finally, driving the welding head 1 to move back to the position above the tin wire by each driving piece, and repeating the steps of picking up the tin wire and welding to carry out the next welding work; meanwhile, the CCD camera 3 detects welding spots between the junction box and the bus bar, and the welding effect between the junction box and the bus bar is guaranteed.

The process needs to be heated for three times, the first heating is low heat, namely the heating temperature of the butt joint 1 is low, so that the surface of the tin wire can be melted to facilitate the adhesion of the insert 8; the second heating is high heat, namely the heating temperature of the butt joint 1 is higher, so that the tin wire can be quickly melted for welding; the third heating is also low heat so that the bonding head 1 can be easily separated from the bonding point.

In addition, in the heating process, the distance H between the measuring end of the thermocouple sensor 17 and the bottom end surface of the welding head 1 is kept to be 3mm-20mm, so that the thermocouple sensor 17 can accurately detect the actual heating temperature of the welding head 1, and the service life of the welding head 1 is ensured.

The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims

1. A bonding tool for soldering, comprising:

the welding head (1) can move on an X axis, a Y axis and a Z axis so that the welding head (1) can move to a welding position on the junction box, a tin wire can be adhered to the bottom end surface of the welding head (1), and the welding head (1) can be heated to a preset temperature;

the thermocouple sensor (17) is fixedly connected with the welding head (1) and is positioned on one side of the welding head (1), the measuring end of the thermocouple sensor (17) is positioned above the bottom end face of the welding head (1) and is 3-20 mm away from the bottom end face of the welding head (1), and the thermocouple sensor (17) is used for detecting the heating temperature of the welding head (1).

2. A soldering tip as claimed in claim 1, characterised in that the spacing H between the measuring end of the thermocouple sensor (17) and the bottom end face of the soldering tip (1) is 5mm.

3. A soldering tip as claimed in claim 1, characterised in that the thermocouple sensor (17) is fixedly connected to the soldering tip (1) by means of a plurality of bending plates (18).

4. A soldering tip for soldering according to claim 1, characterized in that the soldering tip (1) is further provided with a wiring channel for mounting a connection wire on the thermocouple sensor (17).

5. A welding head for tin adding welding according to any one of the claims 1 to 4, characterized in that a clamping groove (111) is arranged on the bottom end face of the welding head (1), an insert (8) is clamped in the clamping groove (111), the insert (8) can stick to molten tin wire, and after the insert (8) is clamped in the clamping groove (111), a tin wire placing groove (112) is formed in the part of the clamping groove (111) below the insert (8).

6. A soldering tip for soldering according to any of claims 1 to 4, characterised in that the soldering tip (1) is made of a molybdenum alloy.

7. Welding device, comprising a soldering tip for soldering according to any of claims 1 to 6, the soldering tip (1) being also rotatable about the Z-axis, the welding device further comprising:

a heating assembly (2) for heating the welding head (1) to bring the welding head (1) to the preset temperature;

the welding device comprises a first driving piece (10), a second driving piece (12), a third driving piece (14) and a fourth driving piece (16), wherein the first driving piece (10) is used for driving the welding head (1) to rotate around a Z axis, and the second driving piece (12), the third driving piece (14) and the fourth driving piece (16) are respectively used for driving the welding head (1) to move along the X axis, the Y axis and the Z axis.

8. Welding device according to claim 7, characterized in that it further comprises a water cooling member (6) for water cooling the welding head (1), the water cooling member (6) comprising:

the welding head comprises a first metal piece (61), wherein one end of the first metal piece (61) is fixedly connected with the welding head (1);

the cooling structure comprises a second metal piece (62) and a plurality of flow channels extending along the Z axis, the other end of the first metal piece (61) is fixedly connected to the second metal piece (62), the flow channels are arranged on the inner side of the second metal piece (62) at intervals in parallel, and cooling water flows in the flow channels.

9. The welding device according to claim 8, characterized in that it further comprises an air cooling member for air cooling the welding head (1), said air cooling member moving with the movement of the welding head (1), said air cooling member comprising:

the air pipe (71) flows with cold air, an air outlet of the air pipe (71) is positioned on one side of the welding head (1), and the air pipe (71) is used for blowing the cold air to the welding head (1).

10. The welding device of claim 7, further comprising:

a CCD camera (3), the CCD camera (3) is used for detecting the welding position on the junction box before welding and the welding point at the welding position after welding.