Pin loading system and method

Abstract

The application belongs to the technical field of PIN pin welding, and particularly relates to a PIN pin feeding system and method, the feeding system comprising a feeding unit, a transfer unit, a rotating unit, a detection unit and a sorting unit, the feeding unit being used for sequentially outputting PIN pins; the transfer unit is used for transferring the PIN pins output by the feeding unit to the rotating unit; the rotating unit is uniformly provided with a plurality of working positions, and the working positions are used for carrying the PIN pins; the detection unit comprises a first detection module and a second detection module, the first detection module is used for detecting the flatness of the PIN pins, and the second detection module is used for detecting the perpendicularity, concentricity and length of the PIN pins; the sorting unit is used for classifying and collecting the normal PIN pins and the abnormal PIN pins; through the detection of the flatness, perpendicularity, concentricity and length of the PIN pins, the application distinguishes the normal and abnormal PIN pins, rejects the defective PIN pins, and realizes the pre-welding sorting of the PIN pins, so as to ensure the welding quality of the PIN pins.

Description

Technical Field

[0001] This invention belongs to the field of PIN soldering technology, specifically relating to a PIN feeding system and method. Background Technology

[0002] The Insulated Gate Bipolar Transistor (IGBT) is the most advanced power semiconductor device among third-generation power electronic devices. It boasts advantages such as high frequency, high voltage, and high current, making it a core component in fields such as flexible AC / DC power transmission, new energy power generation, and power quality management. It is currently widely used in related industries. In IGBT module packaging, pins are fixed to designated positions using soldering to achieve electrical and signal transmission.

[0003] When ultrasonic welding is used to solder pins to the PCB substrate in IGBT modules, if the bottom of the pin is not firmly connected to the substrate or the welding is tilted, it will affect the product quality and lifespan. Pins need to be loaded before welding. Defective pins can easily cause deviations when the welding head nozzle picks them up, resulting in a low pin retrieval success rate and a high welding defect rate. Therefore, pin defect detection is necessary.

[0004] Therefore, it is necessary to improve the existing technology to overcome its shortcomings in practical applications. Summary of the Invention

[0005] Based on the aforementioned shortcomings and deficiencies in the prior art, one of the objectives of this invention is to at least solve one or more of the aforementioned problems in the prior art. In other words, one of the objectives of this invention is to provide a PIN pin feeding system and method that meets one or more of the aforementioned requirements.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] This invention provides a PIN pin feeding system, including a feeding unit, a transfer unit, a rotation unit, a detection unit, and a sorting unit.

[0008] The feeding unit is used to output several PIN pins sequentially;

[0009] The transfer unit is used to transfer the PIN pins output by the feeding unit to the rotating unit;

[0010] The rotating unit has several working positions evenly arranged on it, and the working positions are used to carry PIN pins;

[0011] The detection unit includes a first detection module and a second detection module. The first detection module is used to detect the flatness of the PIN pin, and the second detection module is used to detect the perpendicularity, concentricity and length of the PIN pin.

[0012] The sorting unit is used to classify and collect PINs that are detected as normal and those that are abnormal.

[0013] As a preferred embodiment, the feeding unit includes a vibratory feeder and a conveying channel. The conveying channel is configured as two conveying channels arranged in parallel. The vibratory feeder is connected to the conveying channel and is used to transfer the PIN needles sequentially to the two conveying channels.

[0014] As a preferred embodiment, the transfer unit includes an X-axis servo module and a needle suction mechanism. The X-axis servo module drives the needle suction mechanism to move, thereby transferring the PIN needles on the delivery channel to the rotating unit.

[0015] As a preferred embodiment, the first detection module is located below the transfer unit, and the first detection module is configured as a 3D laser line scanning camera and is used to detect the flatness of the PIN pin.

[0016] As a preferred embodiment, the second detection module is mounted on the rotating platform. The second detection module includes a Z-axis servo module and a 2D camera. The Z-axis servo module is connected to the 2D camera and is used to drive the 2D camera to move up and down. The 2D camera is used to detect the perpendicularity, concentricity, and length of the PIN pins.

[0017] As a preferred embodiment, the rotation unit includes an R-axis servo module and a rotation platform. The R-axis servo module is connected to the rotation platform and is used to drive the rotation of the rotation platform.

[0018] As a preferred embodiment, the rotating platform is configured with four working positions, each of which is provided with a boss for carrying PIN pins.

[0019] As a preferred embodiment, the sorting unit includes a first sorting module and a second sorting module, wherein the first sorting module is used to collect PIN pins that are detected as normal, and the second sorting module is used to collect PIN pins that are detected as abnormal.

[0020] The present invention also provides a PIN feeding method, applied to the PIN feeding system described in any of the above embodiments, the PIN feeding method comprising the following steps:

[0021] S1. Several PIN pins are output sequentially through the feeding unit;

[0022] S2. The PIN pins output from the loading unit are transferred to the rotating unit via the transfer unit;

[0023] S3. The PIN pins are inspected for defects by the detection unit, and the PIN pins that are normal and those that are abnormal are sorted and collected by the sorting unit.

[0024] Compared with the prior art, the beneficial effects of this invention are:

[0025] This invention provides a PIN feeding system that identifies normal and abnormal PINs by detecting their flatness, perpendicularity, concentricity, and length, and removes defective PINs, thereby achieving pre-soldering sorting of PINs to ensure the soldering quality of PINs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a PIN pin feeding system according to an embodiment of the present invention;

[0028] Figure 2 This is a flowchart illustrating a PIN pin feeding method according to an embodiment of the present invention;

[0029] In the diagram: 1. Feeding unit, 2. Transfer unit, 31. First detection module, 32. Second detection module, 4. Rotation unit, 51. First sorting module, 52. Second sorting module. Detailed Implementation

[0030] To more clearly illustrate the embodiments of this application, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0031] In the description of the embodiments of this application, the terms "upper," "lower," "front," "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," etc., are only used for distinction in description and have no special meaning.

[0032] According to some embodiments of this application, please refer to Figure 1 As shown, a PIN feeding system is provided, including a feeding unit 1, a transfer unit 2, a rotating unit 4, a detection unit, and a sorting unit. The feeding unit 1 is used to output several PINs sequentially; the transfer unit 2 is used to transfer the PINs output by the feeding unit to the rotating unit; the rotating unit 4 has several working positions evenly arranged on it, and the working positions are used to carry PINs; the detection unit includes a first detection module 31 and a second detection module 32. The first detection module 31 is used to detect the flatness of the PINs, and the second detection module 32 is used to detect the perpendicularity, concentricity, and length of the PINs; the sorting unit is used to classify and collect PINs that have passed the detection and PINs that are abnormal.

[0033] In some embodiments of this application, the feeding unit 1 includes a vibratory feeder and a conveying channel. The conveying channel is configured as two conveying channels arranged in parallel. The vibratory feeder is connected to the conveying channel and is used to transfer the PIN needles sequentially to the two conveying channels.

[0034] Furthermore, the vibratory feeder has a hopper, and a pulse electromagnet is installed below the hopper to drive the hopper to vibrate vertically. An inclined spring plate drives the hopper to oscillate around its vertical axis. Due to this vibration, the PIN needles in the hopper rise along the spiral track. During the ascent, they undergo a series of track screenings or posture changes, and the PIN needles are arranged in a uniform and orderly manner and transported in pairs along the two channels to the docking dual feed inlets. After the material sensing fiber optic detection sensor detects that the PIN needles are in place, the rotary servo DR rotates 90 degrees to the PIN needle waiting position, so that the originally flat PIN needles stand up for subsequent needle removal.

[0035] In some embodiments of this application, the transfer unit 2 includes an X-axis servo module and a needle suction mechanism. The X-axis servo module drives the needle suction mechanism to move, thereby transferring the PIN needles on the delivery channel to the rotating unit.

[0036] Specifically, during the needle retrieval process, the X-axis servo module drives the needle suction mechanism to move. The needle suction mechanism aligns with the two feed ports and descends to its final position. At this point, the needle suction mechanism just touches the tips of the two PIN needles at the feed ports, picks up the two PIN needles, and then rises again to complete the entire needle retrieval process. During the needle release process, the X-axis servo module drives the needle suction mechanism to move to the position where the two sets of suction holes on the bosses of the four stations on the rotating platform (taking boss A as an example) are aligned. The needle suction mechanism descends to its final position, and by controlling the needle suction mechanism, the two sets of suction holes on boss A are attracted and the two PIN needles are released. As a result, the two PIN needles fall down and are attracted by boss A. The needle suction mechanism then rises again to complete the entire needle release process.

[0037] In some embodiments of this application, the first detection module is located below the transfer unit, and the first detection module is configured as a 3D laser line scanning camera and is used to detect the flatness of the PIN pin.

[0038] Specifically, the 3D laser line scan camera is based on the principle of triangulation. It emits a laser line through a laser emitter, which is projected onto the surface of an object and reflected. The reflected light is captured by the lens and then reflected onto a photosensitive chip. The photosensitive chip receives the information from the reflected light and processes it through internal algorithms to generate the object's three-dimensional contour data. Simply put, the 3D laser line scan camera reconstructs the three-dimensional shape of a pin by capturing the reflection information of the laser line on the bottom surface of the pin, thus detecting pits or bumps on the pin's bottom surface. It features high precision and high efficiency. A grating ruler follows the X-axis movement of the module to record the position and feeds back the position to the 3D laser line scan camera's controller in real time via pulses. The controller then controls the camera's frame rate by calculating the pulse change amount and pulse change rate.

[0039] In some embodiments of this application, the second detection module is mounted on a rotating platform. The second detection module includes a Z-axis servo module and a 2D camera. The Z-axis servo module is connected to the 2D camera and is used to drive the 2D camera to move up and down. The 2D camera is used to detect the perpendicularity, concentricity and length of the PIN pin.

[0040] Specifically, the Z-axis servo module is equipped with a top-view 2D camera and a side-view 2D camera. After the rotating unit carrying the PIN arrives at the inspection station, the Z-axis servo module with the top-view 2D camera positions itself at the first imaging height. The top-view 2D camera focuses on the tip of the PIN from the top down, capturing the first image. Next, the Z-axis servo module with the top-view 2D camera positions itself at the second imaging height, and the side-view 2D camera focuses on the PIN seat, capturing the second image. At this point, the side-view 2D camera's imaging is complete. The vision system calculates the perpendicularity and concentricity of the PIN based on the first and second images. After the top-view 2D camera finishes imaging, the side-view 2D camera takes a horizontal image of the entire PIN from the side, capturing the third image. The vision system then calculates the overall length of the PIN.

[0041] In some embodiments of this application, the rotation unit includes an R-axis servo module and a rotation platform. The R-axis servo module is connected to the rotation platform and is used to drive the rotation of the rotation platform.

[0042] Furthermore, the rotary platform is equipped with four working positions, each with a boss for supporting PIN pins. The rotary platform is driven to rotate by an R-axis servo module, which in turn links the four pairs of bosses supporting PIN pins to switch between different working positions, thereby realizing the assembly line operation of PIN pins.

[0043] In some embodiments of this application, the sorting unit includes a first sorting module 41 and a second sorting module 42. The first sorting module is used to collect PIN pins that are detected as normal, and the second sorting module is used to collect PIN pins that are detected as abnormal.

[0044] Specifically, through two sets of nozzles controlled by single-control solenoid valves and a set of pipes connected to the first sorting module, PIN needles with normal detection results are blown into the pipe by controlling the corresponding nozzle and slide into the receiving box of the first sorting module; PIN needles with abnormal detection results are blown into the pipe by controlling the corresponding nozzle and slide into the receiving box of the second sorting module.

[0045] According to some embodiments of this application, a PIN pin feeding method is also provided, applied to the PIN pin feeding system described above, such as... Figure 2 As shown, the PIN pin feeding method includes the following steps:

[0046] S1. Several PIN pins are output sequentially through the feeding unit;

[0047] S2. The PIN pins output from the loading unit are transferred to the rotating unit via the transfer unit;

[0048] S3. The PIN pins are inspected for defects by the detection unit, and the PIN pins that are normal and those that are abnormal are sorted and collected by the sorting unit.

[0049] According to some embodiments of this application, a PIN pin feeding method is provided. By detecting the flatness, perpendicularity, concentricity, and length of the PIN pins, the normal and abnormal PIN pins are identified, and defective PIN pins are rejected, thereby achieving pre-soldering sorting of PIN pins to ensure the soldering quality of the PIN pins.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0051] The above description is only a detailed explanation of the preferred embodiments and principles of this application. For those skilled in the art, there may be changes in the specific implementation based on the ideas provided by this invention, and these changes should also be considered within the scope of protection of this application.

Claims

1. A PIN pin feeding system, characterized in that, It includes a feeding unit, a transfer unit, a rotating unit, a detection unit, and a sorting unit. The feeding unit is used to output several PIN pins sequentially; The transfer unit is used to transfer the PIN pins output by the feeding unit to the rotating unit; The rotating unit has several working positions evenly arranged on it, and the working positions are used to carry PIN pins; The detection unit includes a first detection module and a second detection module. The first detection module is used to detect the flatness of the PIN pin, and the second detection module is used to detect the perpendicularity, concentricity and length of the PIN pin. The sorting unit is used to classify and collect PINs that are detected as normal and those that are abnormal.

2. The PIN pin feeding system according to claim 1, characterized in that, The feeding unit includes a vibratory feeder and a conveying channel. The conveying channel is configured as two parallel conveying channels. The vibratory feeder is connected to the conveying channel and is used to transfer the PIN needles sequentially to the two conveying channels.

3. The PIN pin feeding system according to claim 2, characterized in that, The transfer unit includes an X-axis servo module and a needle suction mechanism. The X-axis servo module drives the needle suction mechanism to move, thereby transferring the PIN needles on the delivery channel to the rotating unit.

4. The PIN pin feeding system according to claim 1, characterized in that, The first detection module is located below the transfer unit. The first detection module is configured as a 3D laser line scanning camera and is used to detect the flatness of the PIN pin.

5. A PIN pin feeding system according to claim 1, characterized in that, The second detection module is mounted on the rotating platform. The second detection module includes a Z-axis servo module and a 2D camera. The Z-axis servo module is connected to the 2D camera and is used to drive the 2D camera to move up and down. The 2D camera is used to detect the perpendicularity, concentricity and length of the PIN pin.

6. A PIN pin feeding system according to claim 1, characterized in that, The rotation unit includes an R-axis servo module and a rotation platform. The R-axis servo module is connected to the rotation platform and is used to drive the rotation of the rotation platform.

7. A PIN pin feeding system according to claim 6, characterized in that, The rotating platform is configured with four working positions, each of which is provided with a boss for supporting PIN pins.

8. A PIN pin feeding system according to claim 1, characterized in that, The sorting unit includes a first sorting module and a second sorting module. The first sorting module is used to collect PIN pins that are detected as normal, and the second sorting module is used to collect PIN pins that are detected as abnormal.

9. A method for feeding PIN pins, characterized in that, The PIN feeding system as described in any one of claims 1 to 8, the PIN feeding method comprising the following steps: S1. Several PIN pins are output sequentially through the feeding unit; S2. The PIN pins output from the loading unit are transferred to the rotating unit via the transfer unit; S3. The PIN pins are inspected for defects by the detection unit, and the PIN pins that are normal and those that are abnormal are sorted and collected by the sorting unit.

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