A blow cleaning device with a ring-shaped air knife

Abstract

The utility model discloses a kind of blowing cleaning devices with annular air knife, including operation platform and the linear guide and transmission machine with motor being set on operation platform, the linear guide is symmetrically set in the middle part position of transmission machine, annular air knife is set in the top of transmission machine, the lower side of annular air knife is provided with annular connecting block, and in the opposite inner side track of two linear guides, respectively movably connected with a slide block, two slides are respectively connected with the two ends of annular connecting block, belt is set on transmission machine, and limit device, control device and anti-falling device are respectively set on the belt, outside transmission machine and transmission machine, limit device is used to be vertically erected after IGBT module, under the belt driving, transport to the lower side of annular air knife, control device is used to control stop belt stop movement when IGBT module is transported to the lower side of annular air knife, guarantee that annular air knife carries out efficient cleaning blowing to IGBT module.The utility model structure is simple and reasonable, practical and convenient.

Description

Technical Field

[0001] This utility model belongs to the field of semiconductor technology and relates to an air-blowing cleaning device with an annular air knife. Background Technology

[0002] In the course of its development, IGBT packaging technology has evolved from silicone potting technology to epoxy molding technology. Regardless of the packaging technology, there are always high requirements for the surface cleanliness of IGBT modules.

[0003] Foreign matter on the surface of IGBT modules includes chip solder balls, DBC solder balls, chip foreign matter, DBC foreign matter, and solder copper shavings. The residue of these foreign matter poses a significant threat to IGBT modules. For example, solder balls remaining on the chip's protective ring can lead to chip failure after long-term aging, thus affecting the module's reliability.

[0004] In addition, foreign matter residue can cause air bubbles in the potting silicone or delamination in the encapsulated epoxy. This can also affect the performance of the IGBT module.

[0005] Currently, to meet the surface cleanliness requirements of IGBT modules encapsulated in silicone or epoxy resin, air guns or plasma fans are used to perform manual or automatic dust removal processes. However, manual dust removal cannot guarantee the comprehensiveness and thoroughness of the cleaning work. Generally, automatic dust removal requires fixing the module, which means that dust can only be removed from one side of the module.

[0006] To address this issue, an air-blowing cleaning device with an annular air knife was designed to overcome the aforementioned problems. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a simple and reasonable air-blowing cleaning device with an annular air knife that is stable in operation, convenient in practice, and can efficiently blow and clean IGBT modules.

[0008] This utility model is achieved through the following technical solution: an air-blowing cleaning device with an annular air knife, comprising an operating table and linear guide rails and a motor-driven transmission machine mounted on the operating table. Two vertically arranged linear guide rails are symmetrically arranged on both sides of the center of the transmission machine. An annular air knife is positioned directly above the transmission machine between the two linear guide rails. An annular connecting block adapted to the annular air knife is positioned directly below the annular air knife. A slider is movably connected to the inner rails of the two linear guide rails, and the two sliders are respectively connected to the two ends of the annular connecting block, thereby driving the annular connecting block. The height of the annular air knife is adjusted by moving up and down between two linear guide rails. A belt is installed on the conveyor, and a limit device, a control device, and an anti-drop device are respectively installed on the belt, the outside of the conveyor, and the conveyor. The limit device is used to transport the IGBT module vertically to the area below the annular air knife under the belt. The control device is used to stop the belt when the IGBT module is transported to the area directly below the annular air knife, ensuring that the annular air knife performs efficient cleaning and blowing on the IGBT module. The anti-drop device is used to prevent the IGBT module transported by the conveyor from falling out from both sides.

[0009] Preferably, the limiting device is a rectangular module clamping base. A first inverted T-shaped groove and a second inverted T-shaped groove, both of equal length and width to the module clamping base, are respectively provided on the upper surface of the module clamping base. The two inverted T-shaped grooves are perpendicular to each other, forming a cross-shaped structure. Two first limiting posts and two limiting posts, each higher than the first and second inverted T-shaped grooves, are movably connected within the first and second inverted T-shaped grooves, respectively. The vertically erected portion of the IGBT module is inserted into the second inverted T-shaped groove or placed on the upper surface of the module clamping base. The positions of the two first limiting posts and two second limiting posts are adjusted so that they are tightly fitted against the four angles of the IGBT module for limiting. Vertical bolt holes are provided on each of the first and second limiting posts. After the position is adjusted, fastening bolts are inserted through the bolt holes for fixation.

[0010] Preferably, the control device consists of a sensor bracket installed on at least one side of the conveyor and a positioning sensor installed on each sensor bracket. The sensor bracket is fixed on the operating table near the middle of the conveyor. A positioning sensor is fixedly installed on the inner side of each sensor bracket. The positioning sensor is connected to the motor circuit of the conveyor through a limit switch. When the positioning sensor detects that the IGBT module on the module holder is conveyed by the belt to a position directly below the annular air knife, the positioning sensor sends a signal to the limit switch. The limit switch controls the motor to pause the belt, so that the annular air knife can clean and blow the IGBT module directly below.

[0011] Preferably, the limiting device consists of two symmetrical elongated limiting plates installed on both sides of the conveyor. The height of the two symmetrical elongated limiting plates is higher than the height of the conveyor belt, forming two surrounding edges to prevent the module clamps on the belt from falling off.

[0012] Preferably, each of the elongated limiting plates consists of two segmented limiting plates arranged front to back with a gap in the middle. This gap is less than the length of the module clamping seat, so as to avoid obstructing the module clamping seat and affecting the operation of the positioning sensor.

[0013] Preferably, the annular air knife has multiple blowing holes evenly distributed on it. The annular air knife is connected to an external power source, and when powered on, it blows and cleans the IGBT module on the module holder through the multiple blowing holes.

[0014] Preferably, the sliders on both sides of the annular air knife are connected to the lifting device, and the lifting device is controlled by the PLC control system to adjust the height of the annular air knife electrically.

[0015] Compared with the prior art, the advantages of this utility model are as follows: 1. This utility model uses a linear guide rail to drive an annular air knife, and the slider of the linear guide rail is adjusted up and down by a lifting device (controlled by a solenoid valve). The movement speed, stroke, and air knife movement speed of the annular air knife are controlled by a PLC control system. The IGBT module is placed vertically on the module clamping seat, which can greatly increase the blowing area of ​​the module, thereby improving the cleaning effect.

[0016] 2. This utility model can accurately transmit the module to the air blowing cleaning position through a combination of a transport machine, a positioning sensor, and a forming switch, thereby improving the cleaning effect.

[0017] 3. The module clamping base of this utility model is provided with an inverted T-shaped groove, and the module is limited by the limiting post movably installed in the inverted T-shaped groove. This can not only limit and clamp IGBT modules of various shapes, but also improve the stability of the module and prevent it from shifting and tipping over during the purging process. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a side view of the present invention.

[0020] Figure 3 This is a side view of the present invention.

[0021] Figure 4This is a structural schematic diagram of the modular vertical mounting base in this utility model.

[0022] Figure 5 This is a top view of the present invention. Detailed Implementation

[0023] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0025] The present invention will now be described in detail with reference to the accompanying drawings: Figure 1-3 As shown, an air-blowing cleaning device with an annular air knife includes an operating table, linear guide rails 1 mounted on the operating table, and a transmission machine 3 with a motor 2. Two vertically arranged linear guide rails 1 are symmetrically arranged on both sides of the center of the transmission machine 3. An annular air knife 4 is positioned directly above the transmission machine 3 between the two linear guide rails 1. An annular connecting block 5, adapted to the annular air knife 4, is positioned directly below the annular air knife 4. A slider 6 is movably connected to the inner rails of the two linear guide rails 1, and the two sliders 6 are connected to the two ends of the annular connecting block 5, thereby driving the annular connecting block 5 to move between the two linear guide rails. The height of the annular air knife 4 can be adjusted by moving it up and down between 1. A belt 7 is provided on the conveyor 3, and a limit device, a control device, and an anti-fall device are respectively provided on the belt 7, the outside of the conveyor 3, and the conveyor 3. The limit device is used to transport the IGBT module 8 vertically to the bottom of the annular air knife under the belt drive. The control device is used to stop the belt 7 when the IGBT module 8 is transported to the bottom of the annular air knife 4, so as to ensure that the annular air knife 4 can efficiently clean and blow the IGBT module 8. The anti-fall device is used to prevent the module 8 transported by the conveyor 3 from falling out from both sides.

[0026] like Figure 4As shown, the limiting device is a rectangular module clamping base 9. A first inverted T-shaped groove 10 and a second inverted T-shaped groove 11, with the same length and width as the module clamping base 9, are respectively provided on the upper surface of the module clamping base 9. The two inverted T-shaped grooves are perpendicular to each other, forming a cross-shaped structure. Two first limiting posts 12 and a second limiting post 13, with heights higher than the first and second inverted T-shaped grooves 10 and 11, are movably connected within the first and second inverted T-shaped grooves 10 and 11, respectively. The vertically erected portion of the IGBT module 8 is inserted into the second inverted T-shaped groove 11 or placed on the upper surface of the module clamping base 9. The positions of the two first limiting posts 12 and 13 are adjusted so that they are tightly fitted against the four angles of the IGBT module 8 for limiting. Bolt holes 14, vertically penetrating the first and second limiting posts 12 and 13, are respectively provided on each first limiting post 12 and 13. After the position adjustment is completed, fastening bolts are inserted through the bolt holes 14 for fixation.

[0027] like Figure 5 As shown, the control device consists of a sensor bracket 15 set on at least one side of the conveyor 3 and a position sensor 16 installed on each sensor bracket 15. The sensor bracket 15 is fixed on the operating table near the middle of the conveyor 3. A position sensor 16 is fixedly installed on the inner side of each sensor bracket 15. The position sensor 16 is connected to the motor 2 of the conveyor 3 via a limit switch (not shown in the figure). When the position sensor 16 detects that the IGBT module 8 on the module clamping seat 9 is conveyed by the belt 7 to the position directly below the annular air knife 4, the position sensor 16 sends a signal to the limit switch, which controls the motor 2 to pause the belt 7, so that the annular air knife 4 can clean and blow the IGBT module 8 directly below.

[0028] The limit switch and position sensor in this utility model are existing technologies, so they will not be explained in detail.

[0029] The limiting device consists of two symmetrical elongated limiting plates installed on both sides of the conveyor 3. The height of the two symmetrical elongated limiting plates is higher than the height of the conveyor belt, forming two surrounding edges to prevent the module clamping seat 9 on the belt 7 from falling out.

[0030] Each of the elongated limiting plates consists of two segmented limiting plates 17, which are arranged front to back with a gap 18 in between. This gap 18 is less than the length of the module clamping seat 9, so as to avoid obstructing the module clamping seat 9 and affecting the operation of the positioning sensor 16.

[0031] The annular air knife 4 has multiple blowing holes 19 evenly distributed on it. The annular air knife 4 is connected to an external power source. When powered on, it blows and cleans the IGBT module 8 on the module holder 9 through the multiple blowing holes 19.

[0032] The sliders 6 on both sides of the annular air knife 4 are connected to the lifting device (which is existing technology and will not be explained in detail). The lifting device is controlled by the PLC control system to lift and lower, thereby electrically adjusting the height of the annular air knife 4.

[0033] The working features of this utility model are as follows: Annular air knife, the annular air knife is connected to a linear guide rail; Linear guide rail, whose stroke and running speed can be controlled by the solenoid valve of the lifting system, drives the annular air knife to move up and down; The conveyor is used to transport the module to be purged and its module holder to the air-purifying position; The sensor is a conventional position sensor that can detect the position of the IGBT module and the module holder. Once the module is transported to the air blowing and cleaning position directly below the annular air knife, the conveyor stops. The module clamping base can flexibly clamp IGBT modules of different shapes by adjusting the limiting pins.

[0034] The sensor bracket can be adjusted to position the sensor, making operation convenient.

[0035] After the IGBT module cleaning is completed, the transport aircraft can be restarted to purge and clean the next IGBT module.

[0036] This invention utilizes a linear guide rail to drive a ring-shaped air knife. The vertical position of the linear guide rail is adjusted via a lifting device (controlled by a solenoid valve), and the movement speed, stroke, and air knife speed of the ring-shaped air knife are controlled by a PLC control system. The IGBT module is placed vertically on the module clamping seat, significantly increasing the cleaning area and thus improving the cleaning effect. This invention, through a combination of a conveyor, a positioning sensor, and a forming switch, accurately transports the module to the air-blowing cleaning position, further enhancing the cleaning effect. The module clamping seat of this invention features an inverted T-shaped groove, and a limiting post movably mounted on the inverted T-shaped groove limits the module's position. This allows for clamping and limiting various shapes of IGBT modules, improving module stability and preventing displacement and tipping during cleaning, thereby improving overall work efficiency and practicality.

[0037] The specific embodiments described herein are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A blowing cleaning device with an annular air knife, comprising an operating table and a linear guide rail (1) and a transmission machine (3) with a motor (2) mounted on the operating table, characterized in that: Two vertically arranged linear guide rails (1) are symmetrically arranged on both sides of the middle position of the transmission machine (3). An annular air knife (4) is arranged between the two linear guide rails (1) directly above the transmission machine (3). An annular connecting block (5) adapted to the annular air knife (4) is arranged directly below the annular air knife (4). A slider (6) is movably connected to the inner rails of the two linear guide rails (1). The two sliders (6) are connected to the two ends of the annular connecting block (5) respectively, which drives the annular connecting block (5) to move up and down between the two linear guide rails (1), thereby adjusting the height of the annular air knife (4). The conveyor (3) is equipped with a belt (7), and a limit device, a control device and an anti-fall device are respectively provided on the belt (7), the outside of the conveyor (3) and the conveyor (3). The limit device is used to transport the IGBT module (8) vertically under the belt drive to the bottom of the annular air knife. The control device is used to control the belt (7) to stop moving when the IGBT module (8) is transported to the bottom of the annular air knife (4), so as to ensure that the annular air knife (4) can efficiently clean and blow the IGBT module (8). The anti-fall device is used to prevent the module (8) transported by the conveyor (3) from falling out from both sides.

2. The air-blowing cleaning device with an annular air knife according to claim 1, characterized in that: The limiting device is a rectangular module clamping base (9). A first inverted T-shaped groove (10) and a second inverted T-shaped groove (11) with the same length and width as the module clamping base (9) are respectively provided on the upper surface of the module clamping base (9). The two inverted T-shaped grooves are perpendicular to each other, forming a cross-shaped structure. Two first limiting posts (12) and a second limiting post (13) with heights higher than the first inverted T-shaped groove (10) and the second inverted T-shaped groove (11) are movably connected within the first inverted T-shaped groove (10) and the second inverted T-shaped groove (11), respectively, to hold the IGBT. The vertical part of the module (8) is inserted into the second inverted T-shaped groove (11) or placed on the upper surface of the module clamping seat (9). The positions of the two first limiting posts (12) and the second limiting post (13) are adjusted so that they are tightly attached to the four angles of the IGBT module (8) to limit them. A bolt hole (14) is opened on each of the first limiting posts (12) and the second limiting post (13) to penetrate vertically. After the position is adjusted, a fastening bolt is inserted through the bolt hole (14) to fix it.

3. The air-blowing cleaning device with an annular air knife according to claim 1, characterized in that: The control device consists of a sensor bracket (15) set on at least one side of the conveyor (3) and a position sensor (16) installed on each sensor bracket (15). The sensor bracket (15) is fixed on the operating table near the middle of the conveyor (3). A position sensor (16) is fixedly installed on the inner side of each sensor bracket (15). The position sensor (16) is connected to the motor (2) of the conveyor (3) through a limit switch. When the position sensor (16) detects that the IGBT module (8) on the module holder (9) is conveyed by the belt (7) to the position directly below the annular air knife (4), the position sensor (16) sends a signal to the limit switch. The limit switch controls the motor (2) to pause the belt (7) so that the annular air knife (4) can clean and blow the IGBT module (8) directly below.

4. The air-blowing cleaning device with an annular air knife according to claim 1, characterized in that: The limiting device consists of two symmetrical long strip limiting plates installed on both sides of the conveyor (3). The height of the two symmetrical long strip limiting plates is higher than the height of the conveyor belt, forming two rims to prevent the module clamping seat (9) on the belt (7) from falling out.

5. The air-blowing cleaning device with an annular air knife according to claim 4, characterized in that: Each of the elongated limiting plates consists of two segmented limiting plates (17), which are arranged front to back with a gap (18) in the middle. The gap (18) is smaller than the length of the module clamping seat (9) to avoid obstructing the module clamping seat (9) and affecting the operation of the positioning sensor (16).

6. The air-blowing cleaning device with an annular air knife according to claim 5, characterized in that: The annular air knife (4) is provided with multiple blowing holes (19) evenly distributed. The annular air knife (4) is connected to an external power source. When powered on, it blows and cleans the IGBT module (8) on the module holder (9) through the multiple blowing holes (19).

7. The air-blowing cleaning device with an annular air knife according to claim 6, characterized in that: The sliders (6) on both sides of the annular air knife (4) are connected to the lifting device. The lifting device is controlled by the PLC control system to lift and lower, thereby electrically adjusting the height of the annular air knife (4).

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