A PIN pin soldering device for a power module

Abstract

The present invention provides a power module PIN pin welding device, which relates to the field of PIN pin welding. The device includes: a pin insertion block, which includes a plurality of welding plates. A plurality of pin insertion channels penetrate through each of the welding plates. The positions of the pin insertion channels on the welding plates are all matched with the welding points on the power module. The pin insertion block is movably arranged along the length direction; a spacer plate is arranged above the pin insertion block, and a spacer channel penetrates through the spacer plate; a placement plate is slidably arranged on the upper surface of the spacer plate along the width direction of the pin insertion block. A placement groove is formed on the upper surface of the placement plate, and welding channels, the number of which is matched with the pin insertion channels on one of the welding plates, penetrate through the bottom of the placement groove. The inner diameter of the welding channels is larger than the inner diameter of the spacer channels; a lifting plate is arranged at a parallel interval below the lower surface of the pin insertion block and the distance between them is adjustable. The present invention can improve the welding efficiency and welding effect of PIN pins and has strong practicability.

Description

Technical Field

[0001] This application relates to the field of integrated packaging and PIN pin soldering, and specifically relates to a PIN pin soldering device for power modules. Background Art

[0002] A power module is an electronic component used to handle high voltages and large currents, and is widely used in fields such as power electronics, motor drives, and renewable energy systems; in practical applications, power modules usually have multiple PIN pins, which are used to connect them to other parts on the circuit board for signal transmission, power supply, and grounding, etc.

[0003] Currently, generally, the PIN pins are soldered to the power module by means of soldering, that is, solder paste is coated on the soldering points of the power module. After the PIN pins are fixed at the soldering points, the solder paste is heated to make the solder paste cover the soldering points, and the soldering is completed after cooling. This soldering method requires the transfer of the PIN pins and the power module between multiple devices, with low soldering efficiency, and the solder only exists at the contact points between the PIN pins and the power module, and the PIN pins are prone to falling off during subsequent use, and the soldering effect is not good. Summary of the Invention

[0004] In order to solve the above-mentioned defects of related prior art, this application provides a PIN pin soldering device for power modules, which can improve the soldering efficiency and soldering effect of PIN pins and has strong practicability.

[0005] In order to achieve the above object, the present invention adopts the following technologies:

[0006] A PIN pin soldering device for power modules, used to solder PIN pins to a power module, the device includes:

[0007] A pin insertion block, including a plurality of soldering plates arranged in an array along its own length direction, and a plurality of pin insertion channels are penetrated along the height direction of the pin insertion block on each of the soldering plates. The positions of the pin insertion channels on each soldering plate match the soldering points on a power module, and the pin insertion block is movably arranged along the length direction;

[0008] A spacer plate is arranged directly above the moving track of the pin insertion block. The middle part of the spacer plate is penetrated along the height direction with spacer channels whose quantity matches that of the pin insertion channels. The inner diameter of the spacer channels matches the inner diameter of the upper ends of the pin insertion channels. When the pin insertion block moves to directly below the middle part of the spacer plate, the upper surface of the pin insertion block is in sliding contact with the lower surface of the spacer plate, and the pin insertion channels are respectively coaxial with the spacer channels;

[0009] The placement plate is slidably arranged on the upper surface of the spacer along the width direction of the pin block. The upper surface of the placement plate is provided with placement grooves whose quantity matches that of the welding plates and whose size matches that of the power module. The placement grooves are arranged in an array along the length direction and the array pitch matches that of the welding plates. The bottom of each placement groove is penetrated by welding channels whose quantity matches that of the pin channels on one welding plate. The inner diameter of the welding channels is larger than that of the spacer channels. When the placement plate moves to the middle of the spacer, the welding channels are respectively coaxial with the spacer channels.

[0010] The lifting plate is arranged in parallel at an interval below the lower surface of the pin block and the interval is adjustable.

[0011] Further, the PIN pin includes a pin body, a base, and a chassis. The base is coaxially arranged on the chassis, and the pin body is coaxially arranged on the base. The pin channel includes a pin body channel, a circular channel, a base channel, and a chassis channel arranged from bottom to top. The cross-sectional shape and size of the pin body channel both match that of the pin body. The cross-section of the circular channel is circular and its size matches that of the pin body. The sum of the depths of the pin body channel and the circular channel is less than the length of the pin body. The size of the base channel matches that of the base, and the size of the chassis channel matches that of the chassis.

[0012] Further, a first electric lead screw is arranged on one side of the pin block, and a first slide bar is arranged on the other side. The first electric lead screw is in threaded cooperation with a first fitting block. The first fitting block is connected with a first driving bar. A first slider is slidably sleeved on the first slide bar. The first slider is connected with a second driving bar. A first installation bin is arranged on the surface of the second driving bar facing the pin block. Two second slide bars both parallel to the width direction are connected between the first driving bar and the second driving bar. The same slide bar is slidably sleeved on the second slide bars. A second installation bin is arranged on the surface of the slide bar facing the pin block. A spring is sleeved on the second slide bars. The two ends of the spring are respectively connected with the first driving bar and the slide bar. When the spring is in its original state, the distance between the first driving bar and the slide bar is less than the width of the pin block. Installation blocks are arranged at both ends of the pin block and are respectively used to extend into the first installation bin and the second installation bin.

[0013] Furthermore, a plurality of annular column bins are fixed above the spacer. Lifting rings are coaxially arranged in the annular column bins. The side wall of the lifting ring has an airtight sliding contact with the inner wall of the annular column bin. The upper part of the side wall of the annular column bin is connected with an air delivery hose for connecting an external gas pump. The lower end surface of the annular column bin is connected with a plurality of first paste delivery hoses. One side of the placement plate is connected with a paste delivery plate which has a sliding contact with the upper surface of the spacer. The paste delivery plate is provided with paste delivery holes along the height direction, and the number of the paste delivery holes matches that of the spacing channels. When the paste delivery plate moves to the middle of the spacer, the paste delivery holes are respectively coaxial with the spacing channels, and the first paste delivery hoses are respectively communicated with the paste delivery holes. A second electric lead screw is arranged above the spacer along the width direction. A second matching block is in threaded cooperation with the second electric lead screw. The second matching block is connected with the upper surface of the placement plate. A third sliding rod is arranged above the spacer along the width direction. A third sliding block is slidably sleeved on the third sliding rod. The third sliding block is connected with the upper surface of the placement plate.

[0014] Furthermore, the upper end surfaces of the annular column bins are all provided with sliding openings along the height direction. Sliding tubes are coaxially and slidably fitted in the sliding openings. The outer wall of the sliding tube has an airtight sliding contact with the inner wall of the sliding opening. The lower end of the sliding tube is connected with the lifting ring and communicated to the lower surface of the lifting ring. The upper end of the sliding tube is connected with a second paste delivery hose for communicating with an external solder paste storage device.

[0015] Furthermore, ventilation bins are arranged at both ends of the lifting plate. One end of each ventilation bin is arranged on the upper surface of the lifting plate and its internal space is communicated with the lower surface of the lifting plate. The other end of each ventilation bin is provided with an opening and the openings all face the space above the middle of the lifting plate. Fan groups are arranged in the ventilation bins.

[0016] Furthermore, a third electric lead screw is arranged along the height direction on the outer edge of one side of the lifting plate. A third matching block is in threaded cooperation with the third electric lead screw. The third matching block is connected with the lifting plate. Three fourth sliding rods are arranged along the height direction on the periphery of the lifting plate. One of the fourth sliding rods is arranged outside one side of the lifting plate, and the other two fourth sliding rods are arranged outside the other side of the lifting plate. Fourth sliding blocks are slidably sleeved on the fourth sliding rods. The fourth sliding blocks are all connected with the lifting plate.

[0017] Further, heating blocks are arranged above the spacer plate at intervals and in parallel, with the number matching that of the welding plates. The heating blocks are arranged in an array along the length direction, and the array pitch matches that of the welding plates. The heating blocks are all arranged to move along the width direction. When the heating blocks move above the middle of the spacer plate, the lower surfaces of the heating blocks are respectively in sliding contact with the upper surfaces of the power modules in the placement grooves. A fourth electric lead screw is arranged above the spacer plate along the width direction. A fourth mating block is in sliding fit with the fourth electric lead screw. The fourth mating block is connected to a heating base. The heating blocks are all connected to the lower surface of the heating base. The heating base is used to heat the heating blocks. A fifth sliding rod is arranged above the spacer plate along the width direction. A fifth sliding block is slidably sleeved on the fifth sliding rod. The fifth sliding block is connected to the heating base.

[0018] Further, an installation frame is arranged above the spacer plate. The installation frame is used to connect an external driving mechanism. A linear cylinder with a driving direction parallel to the height direction is arranged on the surface of the installation frame facing the spacer plate. The driving shaft of the linear cylinder is connected to an installation strip. The lower surface of the installation strip is connected with a suction cup mechanism whose quantity and spacing both match those of the welding plates. The suction cup mechanism is used to adsorb the power modules.

[0019] Further, polytetrafluoroethylene coatings are applied to the surface of the spacer plate, the inner wall of the spacer channel, the lower surface of the placement plate, the bottom surface of the placement groove, and the inner wall of the welding channel.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. After inserting the PIN pins into the pin insertion block and placing the power modules into the placement grooves, the device can be used for welding, without the need to transfer the PIN pins and the power modules between multiple devices, improving the welding efficiency.

[0022] 2. Welding is carried out in the welding channel, and before welding, the PIN pins move upward, enabling the solder paste to cover the upper ends of the tin pins, ensuring the stability of welding and improving the welding effect. Description of the Drawings

[0023] Figure 1 is a three-dimensional schematic diagram of the power module PIN pin welding device according to the embodiment of the present application.

[0024] Figure 2 is a three-dimensional schematic diagram of the power module with PIN pin welding completed according to the embodiment of the present application.

[0025] Figure 3 is a three-dimensional schematic diagram of the pin insertion block and its affiliated structures according to the embodiment of the present application.

[0026] Figure 4 is a plane cross-sectional view of the pin insertion channel, the spacer channel, and the welding channel according to the embodiment of the present application.

[0027] Figure 5It is a three-dimensional schematic diagram of the spacer plate and the placement plate of the embodiment of the present application.

[0028] Figure 6 It is a three-dimensional schematic diagram of the annular column bin and its accessory structure according to an embodiment of the present application.

[0029] Figure 7 It is a three-dimensional schematic diagram of the lifting plate and its auxiliary structure according to an embodiment of the present application.

[0030] Figure 8 It is a three-dimensional schematic diagram of the heating block and its accessory structure according to an embodiment of the present application.

[0031] Figure 9 It is a three-dimensional schematic diagram of the suction cup mechanism and its accessory structure of an embodiment of the present application.

[0032] Markings in the figure: 1-pin block, 11-pin channel, 12-needle body channel, 13-circular channel, 14-base channel, 15-chassis channel, 16-first electric screw, 17-first matching block, 18-first drive bar, 19-first slide bar, 110-first slider, 111-second drive bar, 112-first installation bin, 113-second slide bar, 114-slide bar, 115-second installation bin, 116-spring, 117-installation block, 2-spacer, 21-spacer channel, 3-placement plate, 31-placement slot, 32-welding channel, 4-lifting plate, 41-ventilation bin, 42-fan group, 43-third electric screw, 44-third matching block, 4 5-fourth slide bar, 46-fourth slider, 5-heating block, 51-fourth electric screw rod, 52-fourth matching block, 53-heating seat, 54-fifth slide bar, 55-fifth slider, 6-annular column bin, 61-lifting ring, 62-gas delivery hose, 63-first ointment delivery hose, 64-ointment delivery plate, 65-ointment delivery hole, 66-second electric screw rod, 67-second matching block, 68-third slide bar, 69-third slider, 610-sliding port, 611-sliding tube, 612-second ointment delivery hose, 7-mounting frame, 71-linear cylinder, 72-mounting bar, 73-suction cup mechanism, 8-PIN needle, 81-needle body, 82-base, 83-chassis, 9-power module. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the implementation modes of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] like Figure 1 and Figure 2As shown in the figure, this embodiment provides a power module PIN pin welding device for welding PIN pins 8 to a power module 9, including a pin insertion block 1, a spacer 2, a placement plate 3, and a lifting plate 4.

[0035] Specifically, as Figure 2 and Figure 3 shown, the pin insertion block 1 includes four welding plates arranged in an array along its own length direction. A plurality of pin insertion channels 11 penetrate through the welding plates along the height direction of the pin insertion block 1. The positions of the pin insertion channels 11 on each welding plate are matched with the welding points on a power module 9. The pin insertion block 1 is movably arranged along the length direction. A plurality of welding plates are provided on the pin insertion block 1 to enable a single pin insertion block 1 to fix the welding needles required for welding on multiple power modules 9.

[0036] Specifically, as Figure 1 、 Figure 2 、 Figure 4 shown, the spacer 2 is arranged directly above the moving track of the pin insertion block 1. A spacer channel 21 that matches the number of pin insertion channels 11 penetrates through the middle of the spacer 2 along the height direction. The inner diameter of the spacer channel 21 is matched with the upper end inner diameter of the pin insertion channel 11. This matching is used to enable the upper end of the PIN pin 8 to enter the spacer channel 21. When the pin insertion block 1 moves to directly below the middle of the spacer 2, the upper surface of the pin insertion block 1 is in sliding contact with the lower surface of the spacer 2, and the pin insertion channels 11 are respectively coaxial with the spacer channels 21.

[0037] Specifically, as Figures 3 - 5 shown, the placement plate 3 is slidably arranged on the upper surface of the spacer 2 along the width direction of the pin insertion block 1. The upper surface of the placement plate 3 is provided with placement grooves 31 that match the number of welding plates and are sized to match the power module 9. More specifically, in this example, there are four placement grooves 31. The placement grooves 31 are arranged in an array along the length direction and the array pitch is matched with the welding plates. The bottoms of the placement grooves 31 are respectively penetrated by welding channels 32 that match the number of pin insertion channels 11 on a single welding plate. More specifically, the positions of the welding channels 32 at the bottom of the placement grooves 31 are matched with the positions of the welding points on the power module 9. The inner diameter of the welding channels 32 is larger than the inner diameter of the spacer channels 21. When the placement plate 3 moves to the middle of the spacer 2, the welding channels 32 are respectively coaxial with the spacer channels 21.

[0038] Specifically, as Figure 1 shown, the lifting plate 4 is arranged in parallel at a certain interval below the lower surface of the pin insertion block 1 and the interval is adjustable.

[0039] During operation, move the pin insertion block 1 so that the pin insertion block 1 is located outside one side of the spacer 2. At this time, insert the PIN pins 8 into the pin insertion channels 11 in sequence from the upper surface of the pin insertion block 1. Then move the pin insertion block 1 directly below the middle of the spacer 2 so that the upper surface of the pin insertion block 1 makes sliding contact with the lower surface of the spacer 2. At this time, the pin insertion channels 11 are respectively coaxial with the spacer channels 21. Fill the solder paste into the spacer channels 21 in sequence; place the power modules 9 into the placement grooves 31 in sequence, and the surface of the power module 9 where the PIN pins 8 are welded contacts the bottom of the placement groove 31. At this time, the welding points of the power module 9 are respectively located at the welding channels 32; move the placement plate 3 to the middle of the spacer 2. At this time, the welding channels 32 are respectively coaxial with the spacer channels 21; move the lifting plate 4 upward so that the lifting plate 4 contacts the lower ends of the PIN pins 8 and drives the PIN pins 8 to move upward in the pin insertion channels 11. At the same time, use manual or mechanical structures to hold the power module 9 to limit its position, so that the upper ends of the PIN pins 8 pass through the spacer channels 21 and enter the welding channels 32 and contact the welding points of the power module 9; since the inner diameter of the welding channels 32 is larger than the inner diameter of the spacer channels 21, the solder paste is filled into the space between the upper ends of the PIN pins 8 and the inner walls of the welding channels 32 by the extrusion of the upper ends of the PIN pins 8, covering the welding points of the power module 9 and the upper ends of the PIN pins 8; use an external heating device to heat the PIN pins 8 or the power module 9 to melt the solder paste, which wraps the welding points of the power module 9 and the upper ends of the PIN pins 8. And under the action of gravity, the solder climbing performance after melting is improved, and it can wrap a larger area of the upper ends of the PIN pins 8 downward; cancel the limit on the power module 9, and continue to move the lifting plate 4 upward smoothly. The lifting plate 4 drives the power module 9 to move upward away from the placement groove 31 through the PIN pins 8. At this time, the welding points are exposed to the outside, and then the welding points can be left to cool. After cooling, use manual or mechanical structures to grab the power module 9 upward so that the PIN pins 8 leave the pin insertion channels 11, spacer channels 21, welding channels 32, and placement groove 31 in sequence, and take out the power module 9 welded with the PIN pins 8, that is, the welding is completed.

[0040] Preferably, as Figure 2 、 Figure 3 、 Figure 5As shown in the figure, the PIN pin 8 includes a pin body 81, a base 82, and a chassis 83. The base 82 is coaxially arranged on the chassis 83, and the pin body 81 is coaxially arranged on the base 82. The pin insertion channel 11 includes a pin body channel 12, a circular channel 13, a base channel 14, and a chassis channel 15 arranged from bottom to top. The cross-sectional shape and size of the pin body channel 12 are both matched to the pin body 81. Specifically, in this example, the cross-sectional shape of the pin body 81 is rectangular, and the pin body channel 12 is used to limit the rotation of the pin body 81; the cross-section of the circular channel 13 is circular and its size is matched to the pin body 81. Such a design is used to prevent the contact area between the pin body 81 and the inner wall of the pin insertion channel 11 from being too large when the pin body 81 moves in the pin insertion channel 11, which may cause excessive friction during movement, affecting the stability of the movement and at the same time causing wear on the surface of the pin body 81; the sum of the depths of the pin body channel 12 and the circular channel 13 is less than the length of the pin body 81, which is used to enable the lower end of the pin body 81 to extend out of the lower end of the pin body channel 12 after the pin insertion is completed; the size of the base channel 14 is matched to the base 82, and the size of the chassis channel 15 is matched to the chassis 83.

[0041] Preferably, as Figure 3 shown in the figure, a first electric lead screw 16 is provided along the length direction on the outer edge of one side of the pin insertion block 1. The first electric lead screw 16 is in threaded cooperation with a first mating block 17. The first mating block 17 is connected to a first drive bar 18. A first sliding rod 19 is provided along the length direction on the outer edge of the other side of the pin insertion block 1. A first slider 110 is slidably sleeved on the first sliding rod 19. The first slider 110 is connected to a second drive bar 111. A first installation bin 112 is provided on the side of the second drive bar 111 facing the pin insertion block 1. Two second sliding rods 113 parallel to the width direction are connected between the first drive bar 18 and the second drive bar 111. The same slide bar 114 is slidably sleeved on the second sliding rods 113. A second installation bin 115 is provided on the side of the slide bar 114 facing the pin insertion block 1. Springs 116 are sleeved on the outer sides of the circumferences of the second sliding rods 113. The two ends of the springs 116 are respectively connected to the first drive bar 18 and the slide bar 114. When the springs 116 are in the original state, the distance between the first drive bar 18 and the slide bar 114 is less than the width of the pin insertion block 1. Installation blocks 117 are provided at both ends of the pin insertion block 1, and the installation blocks 117 are respectively used to extend into the first installation bin 112 and the second installation bin 115. The first electric lead screw 16 is used to drive the pin insertion block 1 to move along the length direction; such a design enables one pin insertion block 1 to perform the pin insertion work while another pin insertion block 1 is performing the welding work. After the welding work is completed, directly remove the pin insertion block 1 that has completed the welding work, and install the other pin insertion block 1 with inserted pins into the device, and then the next welding can be immediately started. The pin insertion work and the welding work are carried out simultaneously, improving the welding efficiency.

[0042] Preferably, as Figure 2 and Figure 6As shown in the figure, four annular column bins 6 are fixed above the spacer 2, and the annular column bins 6 are used for storing solder paste; lifting rings 61 are coaxially arranged in the annular column bins 6, and the side wall of the lifting ring 61 is in airtight sliding contact with the inner wall of the annular column bin 6. The upper parts of the side walls of the annular column bins 6 are all communicated with air conveying hoses 62, and the air conveying hoses 62 are used to connect to an external air pump; a plurality of first solder paste conveying hoses 63 are communicated with the lower end surfaces of the annular column bins 6. One side of the placement plate 3 is connected with a solder paste conveying plate 64. The solder paste conveying plate 64 is in sliding contact with the upper surface of the spacer 2. Solder paste conveying holes 65 matching the number of the spacer channels 21 are penetrated along the height direction on the solder paste conveying plate 64. When the solder paste conveying plate 64 moves to the middle of the spacer 2, the solder paste conveying holes 65 are respectively coaxial with the spacer channels 21, and the first solder paste conveying hoses 63 are respectively communicated with the solder paste conveying holes 65. A second electric lead screw 66 is arranged above the spacer 2 along the width direction. A second matching block 67 is in threaded cooperation with the second electric lead screw 66, and the second matching block 67 is connected to the upper surface of the placement plate 3. A third sliding rod 68 is arranged above the spacer 2 along the width direction. A third sliding block 69 is slidably sleeved on the third sliding rod 68, and the third sliding block 69 is connected to the upper surface of the placement plate 3. The second electric lead screw 66 is used to drive the placement plate 3 to slide on the upper surface of the spacer 2; during operation, the solder paste is filled in the space between the lifting ring 61 and the lower end of the annular column bin 6. Move the solder paste conveying plate 64 to the middle of the spacer 2. At this time, the solder paste conveying holes 65 are respectively coaxial with the spacer channels 21. Control the air pressure in the space between the lifting ring 61 and the upper end of the annular column bin 6 through the air conveying hose 62 to drive the lifting ring 61 to move, and drive the solder paste to enter the spacer channels 21 through the first solder paste conveying hoses 63 and the solder paste conveying holes 65, that is, the filling of the solder paste is completed.

[0043] Preferably, as Figure 6 shown in the figure, sliding openings 610 are penetrated along the height direction on the upper end surfaces of the annular column bins 6. Sliding tubes 611 are coaxially slidably fitted in the sliding openings 610. The outer wall of the sliding tube 611 is in airtight sliding contact with the inner wall of the sliding opening 610. The lower end of the sliding tube 611 is connected to the lifting ring 61 and communicated to the lower surface of the lifting ring 61. The upper end of the sliding tube 611 is communicated with a second solder paste conveying hose 612, and the second solder paste conveying hose 612 is used to communicate with an external solder paste storage device; with such a design, when the placement plate 3 is located in the middle of the spacer 2, by reducing the air pressure in the space between the lifting ring 61 and the upper end of the annular column bin 6, the lifting ring 61 is driven to move upward, and the external solder paste can be pumped into the annular column bin 6 through the sliding tube 611 and the second solder paste conveying hose 612 for replenishing the solder paste.

[0044] Preferably, as Figure 7As shown, ventilation chambers 41 are provided at both ends of the lifting plate 4. One end of each ventilation chamber 41 is located on the upper surface of the lifting plate 4, and its internal space communicates with the lower surface of the lifting plate 4. The other end of each ventilation chamber 41 is open, and its opening faces the space above the middle of the lifting plate 4. Fan groups 42 are provided in the ventilation chambers 41. The ventilation chambers 41 and the fan groups 42 are used to accelerate the cooling of the welding points when the welding points are exposed to the outside.

[0045] Preferably, as Figure 7 shown, a third electric lead screw 43 is provided along the height direction on the outer edge of one side of the lifting plate 4. A third mating block 44 is in threaded cooperation with the third electric lead screw 43. The third mating block 44 is connected to the lifting plate 4. Three fourth sliding rods 45 are provided along the height direction on the periphery of the lifting plate 4. One of the fourth sliding rods 45 is located outside one side of the lifting plate 4, and the other two fourth sliding rods 45 are located outside the other side of the lifting plate 4. Fourth sliding blocks 46 are slidably sleeved on the fourth sliding rods 45, and the fourth sliding blocks 46 are all connected to the lifting plate 4. The third electric lead screw 43 is used to drive the lifting plate 4 to move along the height direction.

[0046] Preferably, as Figure 2 and Figure 8 shown, heating blocks 5 are provided above the spacer plate 2 at intervals and in parallel, and the number of heating blocks 5 matches that of the welding plates. The heating blocks 5 are arranged in an array along the length direction, and the array pitch matches that of the welding plates. The heating blocks 5 are all arranged to move along the width direction. When the heating blocks 5 move above the middle of the spacer plate 2, the lower surfaces of the heating blocks 5 are respectively in sliding contact with the upper surfaces of the power modules 9 in the placement grooves 31. A fourth electric lead screw 51 is provided above the spacer plate 2 along the width direction. A fourth mating block 52 is in sliding cooperation with the fourth electric lead screw 51. The fourth mating block 52 is connected to a heating seat 53. The heating blocks 5 are all connected to the lower surface of the heating seat 53. The heating seat 53 is used to heat the heating blocks 5. A fifth sliding rod 54 is provided above the spacer plate 2 along the width direction. A fifth sliding block 55 is slidably sleeved on the fifth sliding rod 54. The fifth sliding block 55 is connected to the heating seat 53. During operation, the heating blocks 5 are used to perform contact heating on the power modules 9, and then heat the welding points through heat conduction. At the same time, the heating blocks 5 can play a role in limiting the power modules 9; the fourth electric lead screw 51 is used to drive the heating blocks 5 to move along the width direction.

[0047] Preferably, as Figure 1 and Figure 9 shown, a mounting frame 7 is provided above the spacer plate 2. The mounting frame 7 is used to connect an external driving mechanism. A linear cylinder 71 with a driving direction parallel to the height direction is provided on the surface of the mounting frame 7 facing the spacer plate 2. The driving shaft of the linear cylinder 71 is connected to a mounting strip 72. The lower surface of the mounting strip 72 is connected with a suction cup mechanism 73 whose quantity and spacing both match those of the welding plates. The suction cup mechanism 73 is used to adsorb the power module 9.

[0048] Preferably, the surfaces of the spacer 2, the inner walls of the spacer channels 21, the lower surfaces of the placement plates 3, the bottom surfaces of the placement grooves 31, and the inner walls of the welding channels 32 are all coated with polytetrafluoroethylene coatings. Such a design is used to prevent the melted tin from adhering to the surfaces of the spacer 2, the inner walls of the spacer channels 21, the lower surfaces of the placement plates 3, the bottom surfaces of the placement grooves 31, and the welding channels 32, and only adhering to the welding points.

[0049] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Obviously, those skilled in the art can make various changes and deformations to the present application without departing from the spirit and scope of the present application.

Claims

1. A power module PIN pin welding device, used for welding a PIN pin (8) to a power module (9), characterized in that the device include: A pin block (1) comprises a plurality of welding plates arranged in an array along its length direction, each of the welding plates having a plurality of pin channels (11) extending along the height direction of the pin block (1), the position of each pin channel (11) on the welding plate matching a welding point on a power module (9), and the pin block (1) being arranged to move along the length direction; The spacer plate (2) is arranged just above the moving track of the pin block (1), and the middle part of the spacer plate (2) is penetrated along the height direction by a number of spacer channels (21) matching the number of the pin channels (11). The inner diameter of the spacer channel (21) matches the inner diameter of the upper end of the pin channel (11). The spacer channel (21) is used to fill solder paste. When the pin block (1) moves to just below the middle part of the spacer plate (2), the upper surface of the pin block (1) and the lower surface of the spacer plate (2) are in sliding contact, and the pin channels (11) are coaxial with the spacer channels (21). A placement plate (3) is slidably arranged on the upper surface of the spacing plate (2) along the width direction of the pin block (1); the upper surface of the placement plate (3) is provided with placement grooves (31) whose number matches the welding plate and whose size matches the power module (9); the placement grooves (31) are used to place the power module (9); and the bottom of the placement grooves (31) is used to contact a side of the power module (9) for welding the PIN pins (8); the placement grooves (31) are arranged in an array along the length direction and the array spacing matches the welding plate; the bottom of the placement grooves (31) is penetrated by welding channels (32) whose number matches the pin channels (11) on one welding plate; the inner diameter of the welding channel (32) is larger than the inner diameter of the spacing channel (21); when the placement plate (3) moves to the middle of the spacing plate (2), the welding channels (32) are respectively coaxial with the spacing channels (21); when the power module (9) is placed in the placement grooves (31), the welding points of the power module (9) are respectively located at the welding channels (32); A lifting plate (4) is arranged below the lower surface of the pin block (1) at an interval and parallel thereto and the interval is adjustable. The lifting plate (4) is used to contact the lower end of the PIN pin (8) and drive the PIN pin (8) to move upward in the pin channel (11), and when the power module (9) is limited, the upper end of the PIN pin (8) passes through the interval channel (21) and enters the welding channel (32) to contact the welding point of the power module (9), so that the solder paste is squeezed by the upper end of the PIN pin (8) and fills into the space between the upper end of the PIN pin (8) and the inner wall of the welding channel (32), thereby covering the welding point of the power module (9) and the upper end of the PIN pin (8); A number of heating blocks (5) matching the number of the welding plates are arranged in parallel and at intervals above the partition plate (2). The heating blocks (5) are arranged in an array along the length direction and the array spacing matches the welding plates. The heating blocks (5) are all arranged to move along the width direction. When the heating blocks (5) move to the middle of the partition plate (2), the lower surfaces of the heating blocks (5) respectively come into sliding contact with the upper surfaces of the power modules (9) in the placement grooves (31). A fourth electric screw (51) is arranged above the partition plate (2) along the width direction. The fourth electric screw (51) is slidably matched with a fourth matching block (52). The fourth matching block (52) is connected to a heating seat (53). The heating blocks (5) are all connected to the lower surface of the heating seat (53). The heating seat (53) is used to heat the heating blocks (5). A fifth sliding rod (54) is arranged above the partition plate (2) along the width direction. A fifth sliding block (55) is provided on the sliding sleeve of the fifth sliding rod (54). The fifth sliding block (55) is connected to the heating seat (53).

2. The power module PIN pin welding device according to claim 1, characterized in that: The PIN needle (8) comprises a needle body (81), a base (82), and a chassis (83); the base (82) is coaxially arranged on the chassis (83); the needle body (81) is coaxially arranged on the base (82); the pin insertion channel (11) comprises a needle body channel (12), a circular channel (13), a base channel (14), and a chassis channel (15) arranged from bottom to top; the cross-sectional shape and size of the needle body channel (12) both match those of the needle body (81); the cross-sectional shape and size of the circular channel (13) are circular and match those of the needle body (81); the sum of the depths of the needle body channel (12) and the circular channel (13) is less than the length of the needle body (81); the size of the base channel (14) matches that of the base (82); and the size of the chassis channel (15) matches that of the chassis (83).

3. The power module PIN pin welding device according to claim 1, characterized in that: A first electric screw (16) is provided on one side of the pin block (1), and a first slide bar (19) is provided on the other side. The first electric screw (16) is threadedly matched with a first matching block (17). The first matching block (17) is connected to a first driving bar (18). A first sliding block (110) is slidably sleeved on the first sliding bar (19). The first sliding block (110) is connected to a second driving bar (111). A first mounting chamber (112) is provided on a side of the second driving bar (111) facing the pin block (1). Two second sliding bars (113) parallel to the width direction are connected between the first driving bar (18) and the second driving bar (111). The sliding sleeves on the two slide bars (113) are provided with the same slide bar (114), and a second mounting chamber (115) is provided on a side of the slide bar (114) facing the pin block (1). A spring (116) is provided on the second slide bar (113), and two ends of the spring (116) are respectively connected to the first drive bar (18) and the slide bar (114). When the spring (116) is in an original state, the distance between the first drive bar (18) and the slide bar (114) is smaller than the width of the pin block (1). Both ends of the pin block (1) are provided with mounting blocks (117), and the mounting blocks (117) are respectively used to extend into the first mounting chamber (112) and the second mounting chamber (115).

4. The power module PIN pin welding device according to claim 1, characterized in that: A plurality of annular column bins (6) are fixed above the partition plate (2), and a lifting ring (61) is coaxially arranged inside the annular column bins (6). The side wall of the lifting ring (61) is in airtight sliding contact with the inner wall of the annular column bin (6), and the upper part of the side wall of the annular column bin (6) is connected to a gas delivery hose (62), and the gas delivery hose (62) is used to connect to an external gas pump. The lower end surface of the annular column bin (6) is connected to a plurality of first ointment delivery hoses (63), and an ointment delivery plate (64) is connected to one side of the placement plate (3), and the ointment delivery plate (64) is in sliding contact with the upper surface of the partition plate (2), and the ointment delivery plate (64) is penetrated along the height direction by a number matching the spacing channel (21). The ointment delivery hole (65) is formed on the ointment delivery plate (64). When the ointment delivery plate (64) moves to the middle of the partition plate (2), the ointment delivery hole (65) is coaxial with the partition channel (21), and the first ointment delivery hose (63) is communicated with the ointment delivery hole (65). A second electric screw (66) is provided above the partition plate (2) along the width direction. The second electric screw (66) is threadedly matched with a second matching block (67). The second matching block (67) is connected to the upper surface of the placement plate (3). A third sliding rod (68) is provided above the partition plate (2) along the width direction. A third sliding block (69) is provided on the sliding sleeve of the third sliding rod (68). The third sliding block (69) is connected to the upper surface of the placement plate (3).

5. The power module PIN pin welding device according to claim 4, characterized in that: The upper end surface of the annular column bin (6) is penetrated by a sliding opening (610) along the height direction, and a sliding tube (611) is coaxially slidably matched inside the sliding opening (610). The outer wall of the sliding tube (611) is in airtight sliding contact with the inner wall of the sliding opening (610). The lower end of the sliding tube (611) is connected to the lifting ring (61) and communicated to the lower surface of the lifting ring (61). The upper end of the sliding tube (611) is connected to a second paste delivery hose (612), and the second paste delivery hose (612) is used to communicate with an external solder paste storage device.

6. The power module PIN pin welding device according to claim 1, characterized in that: Both ends of the lifting plate (4) are provided with ventilation bins (41); one end of the ventilation bins (41) is provided on the upper surface of the lifting plate (4) and its internal space is communicated with the lower surface of the lifting plate (4); the other end of the ventilation bins (41) is provided with openings and the openings face the space above the middle of the lifting plate (4); and a fan group (42) is provided in the ventilation bins (41).

7. The power module PIN pin welding device according to claim 1, characterized in that: A third electric screw (43) is provided on the outside of one side of the lifting plate (4) along the height direction, the third electric screw (43) is threadedly matched with a third matching block (44), the third matching block (44) is connected to the lifting plate (4), and three fourth sliding rods (45) are provided on the circumference of the lifting plate (4) along the height direction, one of the fourth sliding rods (45) is provided on the outside of one side of the lifting plate (4), and the other two fourth sliding rods (45) are provided on the outside of the other side of the lifting plate (4), and the fourth sliding rods (46) are all slidably sleeved on the fourth sliding rods (45), and the fourth sliding rods (46) are all connected to the lifting plate (4).

8. The power module PIN pin welding device according to claim 1, characterized in that: A mounting frame (7) is provided above the partition plate (2), the mounting frame (7) being used to connect to an external driving mechanism, a linear cylinder (71) having a driving direction parallel to the height direction is provided on a side of the mounting frame (7) facing the partition plate (2), a mounting bar (72) is connected to the driving shaft of the linear cylinder (71), a suction cup mechanism (73) whose number and spacing match those of the welding plate is connected to the lower surface of the mounting bar (72), and the suction cup mechanism (73) is used to adsorb the power module (9).

9. The power module PIN pin welding device according to claim 1, characterized in that: The surface of the partition plate (2), the inner wall of the partition channel (21), the lower surface of the placement plate (3), the bottom surface of the placement groove (31), and the inner wall of the welding channel (32) are all coated with a polytetrafluoroethylene coating.

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