Automatic needle dialing device for IGBT module and working method thereof

Abstract

This invention relates to the field of semiconductor packaging technology, and more particularly to an automated pin-shifting device and its operating method for IGBT modules. The device includes a horizontally arranged guide groove and an active body and a driven body slidably disposed on the guide groove along its length. The active body reciprocates on the guide groove, and the active body and the driven body are connected by a magnetic attraction structure. This invention effectively solves the problems of partiality and inaccuracy in traditional pin-shifting detection. It facilitates bidirectional pin-shifting detection, enabling periodic loading of the shifting force and improving detection accuracy. Furthermore, this bidirectional periodic loading of force can more effectively detect the fatigue resistance of the pins, further enhancing detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of semiconductor packaging technology, and more particularly to an automated pin-shifting device for IGBT modules and its operating method. Background Technology

[0002] In the field of modern power electronics technology, IGBT (Insulated Gate Bipolar Transistor) modules, as key power semiconductor devices, are widely used in high-reliability applications such as frequency converters, new energy drives, and industrial power supplies. The pins in the modules are fixed to the substrate by soldering. The soldering quality directly affects the electrical connection reliability and long-term stability of the module. Therefore, the detection of the soldering firmness of the pins has become a crucial link in the production process.

[0003] Traditional testing methods apply unidirectional compressive force to the PIN pin, causing it to bend to a specified degree, and then measure the reaction force to determine the strength of the solder joint. However, this method has significant limitations: firstly, it can only achieve lateral movement of the PIN pin in one direction, resulting in a large limitation in testing; secondly, the testing process is a single-point static loading, which cannot achieve periodic or bidirectional loading of force, making it difficult to assess the true bonding state and fatigue resistance of the PIN pin at the solder interface. Summary of the Invention

[0004] This invention provides an automated pin-adjusting device and its working method for IGBT modules, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An automated pin-setting device for IGBT modules includes a horizontally arranged guide groove and an active body and a driven body slidably disposed on the guide groove along its length. The active body reciprocates on the guide groove, and the active body and the driven body are connected by a magnetic attraction structure. Two resistance plates are arranged opposite to each other on the guide groove, and the resistance plates are arranged parallel to the guide groove. The driven body is provided with conductive bodies that cooperate with the two resistance plates respectively. The resistance plates and the conductive bodies are electrically connected to each other, and the two conductive bodies are connected to each other. The two resistance plates are connected to an external circuit through wires.

[0007] The driven body is provided with a pin puller for adjusting the pin.

[0008] Furthermore, the needle-shifting device also includes an end plate disposed outside the guide groove, and the guide groove performs circumferential motion on the end plate.

[0009] Furthermore, an annular groove is provided on the end face of the end plate, and the shape of the annular groove is a pattern surrounding the axis of the end plate;

[0010] A connecting rod parallel to the guide groove is provided on the active body, and a sliding column that cooperates with the annular groove is provided on the connecting rod.

[0011] Furthermore, the magnetic attraction structure includes a permanent magnet disposed on the active body and a magnetic guiding unit disposed on the driven body. The permanent magnet is rotatably disposed on the active body, and an insulating pad is disposed between the permanent magnet and the magnetic guiding unit.

[0012] Two opposing arc-shaped grooves are provided on the side wall of the driven body. A slidable pin is provided in each arc-shaped groove. The slidable pin is connected to the magnetic guiding unit. The magnetic guiding unit moves vertically and is reversing through the arc-shaped grooves and the slidable pins.

[0013] Furthermore, the magnetically conductive unit is an electromagnet, and the magnetically conductive unit is electrically connected to the conductive body;

[0014] The resistor plate consists of two separate plates, which are distributed on both sides of the center point of the guide groove along the length of the guide groove. The wires on the plates for connecting to external circuits are connected to the end of the plates away from the center point of the guide groove.

[0015] Furthermore, the conductor is a rolling body, which consists of a fixed disk in the middle, two movable disks on both sides, and a number of strips arranged in a ring between the fixed disk and the movable disks. Adjacent strips are connected to the fixed disk and the movable disks respectively, and adjacent strips are slidably connected to each other.

[0016] The partition plate is composed of several pieces arranged vertically. When the fixed disk and the movable disk move relative to each other, the number of electrical connections between the conductor and the pieces can be adjusted.

[0017] Furthermore, the needle-pulling device also includes a plurality of hydraulic cylinders for driving the end plate to move in the vertical direction, threaded columns fixedly arranged relative to the hydraulic cylinders, and a connecting frame arranged on the guide groove, wherein the connecting frame is threadedly connected to the threaded columns.

[0018] The driven body and the lever sleeve are connected by a telescopic rod. The telescopic rod includes a fixed sleeve and a movable column that are respectively connected to the driven body and the lever sleeve. The end of the movable column is slidably inserted into the fixed sleeve. An air hole is provided on the side wall of the fixed sleeve. A baffle is provided on the side wall of the fixed sleeve to partially block the air hole. The baffle opens in one direction within the air hole. The baffle is connected to the fixed sleeve by a spring piece.

[0019] Furthermore, a buckle is provided on the driven body, and a turntable is rotatably provided inside the buckle. The fixed sleeve can be rotatably connected to the driven body through the buckle and the turntable. Several permanent magnets II and III are respectively provided on the inner wall of the buckle and the outer wall of the turntable for mutual cooperation.

[0020] Furthermore, a plurality of side pressure bodies are arranged around the axis of the shift sleeve inside the shift sleeve, and the side pressure bodies are slidably arranged at an angle. Pressure plates are slidably arranged on the plurality of side pressure bodies, and the pressure plates are connected to the shift sleeve by springs.

[0021] The operating method of the automated pin-shifting device for IGBT modules includes the following steps:

[0022] Fix the IGBT module on the test stage, and align the PIN pins in the IGBT module with the switch sleeve;

[0023] The drive sleeve moves down and is fitted onto the PIN pin, and several side pressure bodies inside the sleeve clamp and fix the PIN pin.

[0024] The lifting end plate carries the connecting frame and moves vertically, generating relative motion with the threaded column, causing the connecting frame to rotate.

[0025] The connecting frame drives the guide groove to rotate on the end plate, and the sliding column on the guide groove slides in the annular groove. The sliding column drives the active body to slide back and forth on the guide groove. At this time, the active body performs a composite motion of circular motion and reciprocating motion on the guide groove.

[0026] The active body uses a magnetic attraction structure to drive the driven body to move. The driven body moves the PIN needle synchronously through the telescopic rod and the lever sleeve. The PIN needle performs reciprocating swing motion in any direction.

[0027] The reaction force of the PIN pin on the sleeve will restrict the movement of the driven body on the guide slot. When the conductor contacts different positions on the resistor plate, the resistance of the resistor plate connected to the circuit changes. By detecting the resistance value of the resistor plate connected to the circuit or the current value of the circuit, the reaction force on the sleeve can be detected, thereby realizing the detection of the PIN pin's firmness.

[0028] When the end plate moves upward, the relative movement of the fixed sleeve and the movable column in the telescopic rod, and the flow restriction effect of the air hole on the gas supplied into the fixed sleeve, enable the telescopic rod to increase the upward pulling force on the PIN pin through the pry sleeve, thereby detecting whether the PIN pin has become loose or fallen off.

[0029] The technical solution of this invention can achieve the following technical effects:

[0030] It effectively solves the problems of one-sidedness and inaccuracy in traditional PIN pin flicking detection. It facilitates the detection of PIN pin flicking in two directions by using bidirectional flicking of the PIN pin, realizing a periodic loading mode of flicking force, improving detection accuracy. At the same time, this periodic loading of bidirectional force can more effectively detect the fatigue resistance of the PIN pin, improving detection accuracy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of an automated pin-shifting device used in IGBT modules.

[0034] Figure 2 for Figure 1 Schematic diagram of the central guide groove and its upper structure;

[0035] Figure 3 for Figure 2 Schematic diagram of the structure of the central guide groove;

[0036] Figure 4 for Figure 2 A schematic diagram of the active body, the driven body, and their structures.

[0037] Figure 5 for Figure 1 Schematic diagram of the middle plate;

[0038] Figure 6 for Figure 4 A schematic diagram of the magnetic attraction structure in the middle;

[0039] Figure 7 for Figure 4 A schematic diagram of the partial structure of the driven body;

[0040] Figure 8 for Figure 7 A structural diagram from another perspective;

[0041] Figure 9 for Figure 8 Schematic diagram of the structure of a medium-conducting conductor;

[0042] Figure 10 for Figure 4 A schematic diagram of the oblique structure of the central buckle plate;

[0043] Figure 11 for Figure 10 Schematic diagram of the structure of the telescopic rod;

[0044] Figure 12 for Figure 4 sectional view of the middle shift sleeve;

[0045] Reference numerals: 100, guide groove; 101, driving body; 102, driven body; 103, resistance plate; 104, conductor; 105, wire; 106, sleeve; 107, end plate; 108, annular groove; 109, connecting rod; 110, sliding column; 111, fixed plate; 112, movable plate; 113, slat; 114, side pressure body; 115, pressure plate; 116, spring;

[0046] 200. Magnetic suction structure; 201. Permanent magnet one; 202. Magnetic conductive unit; 203. Insulating pad; 204. Arc groove; 205. Pulley;

[0047] 300. Hydraulic cylinder; 301. Connecting frame; 302. Threaded column; 303. Telescopic rod; 304. Fixed sleeve; 305. Movable column; 306. Air hole; 307. Baffle; 308. Spring; 309. Reset motor; 310. Threaded rod;

[0048] 400. Snap plate; 401. Turntable; 402. Permanent magnet II; 403. Permanent magnet III. Detailed Implementation

[0049] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] like Figures 1 to 4 As shown, this application provides an automated pin-shifting device for IGBT modules, including a horizontally arranged guide groove 100 and an active body 101 and a driven body 102 slidably disposed on the guide groove 100 along its length. The active body 101 slides back and forth on the guide groove 100, and the active body 101 and the driven body 102 are connected by a magnetic attraction structure 200. Two resistance plates 103 are disposed opposite to each other on the guide groove 100, and the resistance plates 103 are parallel to the guide groove 100. The driven body 102 is provided with conductive bodies 104 that cooperate with the two resistance plates 103 respectively. The resistance plates 103 and the conductive bodies 104 are electrically connected to each other, and the two conductive bodies 104 are connected to each other. The two resistance plates 103 are connected to an external circuit through wires 105.

[0052] The driven body 102 is provided with a pin release sleeve 106 for adjusting the pin.

[0053] Specifically, the guide groove 100 provides an activity area for the driving body 101 and the driven body 102, and restricts the driving body 101 and the driven body 102 to only perform horizontal movement. The driving body 101 can be driven by a cylinder, reciprocating mechanism, motor, etc. to perform reciprocating motion on the guide groove 100. The center point of the reciprocating motion of the driving body 101 can coincide with the center point of the guide groove 100, so that the vertical line where the center point of the guide groove 100 is located coincides with the pin. Of course, the driving body 101 can also perform reciprocating motion on the guide groove 100 at a position away from the center point of the guide groove 100. It only needs to be able to achieve the periodic movement of the active body 101; the active body 101 and the driven body 102 can be connected by the magnetic attraction structure 200. In the natural state, the active body 101 and the driven body 102 can overlap each other in the vertical direction. When the driven body 102 is affected by the PIN needle and can only move within a specified range, the active body 101 and the driven body 102 will be separated. At this time, the magnetic attraction structure 200 allows the active body 101 and the driven body 102 to no longer be in direct contact, and the magnetic attraction structure 200 can still provide interaction force for the active body 101 and the driven body 102.

[0054] When the driven body 102 moves on the guide groove 100, it can drive the conductor 104 to move synchronously. The conductor 104 can contact different positions on the corresponding resistor plate 103. At this time, the part of the resistor plate 103 connected to the circuit is the area between the conductor 104 and the wire 105. When the size of this area changes, the resistance value connected to the circuit changes, and the current in the circuit changes. By measuring the current or the resistance value of the resistor plate 103 connected to the circuit, the position of the driven body 102 on the guide groove 100 can be determined. The current passes through one resistor plate 103, one conductor 104, another conductor 104, and another resistor plate 103 in sequence and exits. This is the method of setting two resistor plates 103 and two conductors 104. In some embodiments, only one resistor plate 103 and one conductor 104 can be set. The resistor plate 103 and the conductor 104 can be directly connected to the external circuit. In this way, the position of the driven body 102 can also be detected using the above method.

[0055] When the shift sleeve 106 is engaged with the PIN needle, the shift sleeve 106 can move vertically downward and fit onto the PIN needle, or a notch can be opened at the bottom of the shift sleeve 106. The direction of the notch through the shift sleeve 106 is perpendicular to or relatively inclined to the direction of movement of the driving body 101 on the guide groove 100. In this way, the PIN needle can be allowed to enter the shift sleeve 106 through the notch simply by moving the shift sleeve 106 laterally, and the movement of the shift sleeve 106 on the guide groove 100 can still provide force to the PIN needle.

[0056] In use, the overall structure is lowered and the lever 106 is fitted onto the PIN pin, driving the driving body 101 to reciprocate on the guide slot 100. When the driving body 101 moves to the left, it pulls the driven body 102 to move synchronously via the magnetic attraction structure 200. The conductor 104 on the driven body 102 moves on the resistance plate 103, and the conductor 104 and the resistance plate 103 remain electrically connected. The driven body 102 tilts the PIN pin to the left via the lever 106, while the PIN pin provides resistance to the lever 106 in the opposite direction. This resistance allows the driven body 102 to move only to a specified position. At this time, the resistance plate 103 is connected. The resistance of the circuit or the current of the detection circuit is used to detect the position of the driven body 102. This allows for the determination of the bending condition and stress of the PIN pin based on the position of the driven body 102, thereby determining the connection strength of the PIN pin. When the soldering of the PIN pin is not strong, the resistance of the PIN pin to the driven body 102 is small, and the displacement of the driven body 102 is large. When the driving body 101 moves to the right, the driving body 101 pulls the driven body 102 to the right synchronously through the magnetic attraction structure 200. At this time, the PIN pin tilts to the right synchronously. Thus, by utilizing the reciprocating motion of the driving body 101 on the guide groove 100, a bidirectional and periodic flicking action is achieved on the PIN pin.

[0057] It should be noted that since the active body 101 and the driven body 102 are allowed to separate, the movement position of the active body 101 is not affected by the driven body 102. The active body 101 can always reciprocate within its specified range, which simplifies the operation and structure and allows the active body 101 to be set independently. Since the conductor 104 reciprocates along the guide groove 100 with the driven body 102 and the active body 101, the wire 105 can be set in the middle of the resistor plate 103. In this way, when the conductor 104 moves to the left or right, the resistance value of the circuit can change periodically with the wire 105 as the center point. This avoids the situation where the wire 105 is only installed on one side of the resistor plate 103, and the reciprocating movement of the conductor 104 can only periodically change the circuit resistance value, and it is not easy to locate the center point of the driven body 102's movement.

[0058] The technical solution of this invention effectively solves the problems of one-sidedness and inaccuracy in traditional PIN pin flicking detection. It facilitates the detection of PIN pin flicking in two directions by using bidirectional flicking of the PIN pin, realizing a periodic loading mode of flicking force, thereby improving detection accuracy. At the same time, this periodic loading of bidirectional force can more effectively detect the fatigue resistance of the PIN pin, further improving detection accuracy.

[0059] Furthermore, such as Figure 5 As shown, the needle-pulling device also includes an end plate 107 disposed outside the guide groove 100, and the guide groove 100 performs circumferential motion on the end plate 107.

[0060] The end plate 107 is sleeved on the outside of the guide groove 100. Both ends of the guide groove 100 are slidably disposed on the inner wall of the end plate 107. When the guide groove 100 rotates on the end plate 107, the guide groove 100 can drive the active body 101 to move synchronously. At this time, the reciprocating swing direction of the active body 101 on the guide groove 100 can be along any direction of the circle where the end plate 107 is located. That is, the active body 101 can drive the dial sleeve 106 and the PIN pin to bend and flick in any direction. This allows for comprehensive testing of the PIN pins and avoids the difference in bending firmness of the PIN pins in different directions due to factors such as uneven solder joint distribution, thereby improving the accuracy of testing.

[0061] Since the guide slot 100 needs to perform circular motion on the end plate 107, the swing center point of the active body 101 coincides with the axis of the end plate 107. This allows the PIN needle to coincide with the axis of the end plate 107, so that the movement trajectory of the active body 101 still revolves around the PIN needle.

[0062] Furthermore, such as Figure 2 and Figure 5As shown, an annular groove 108 is provided on the end face of the end plate 107, and the shape of the annular groove 108 is a pattern around the axis of the end plate 107.

[0063] A connecting rod 109 parallel to the guide groove 100 is provided on the active body 101, and a sliding column 110 that cooperates with the annular groove 108 is provided on the connecting rod 109.

[0064] The pattern of the annular groove 108 can be composed of several arcs arranged in a ring. When the sliding column 110 moves within each arc, the distance between the sliding column 110 and the axis of the end plate 107 can change. When the sliding column 110 moves within the annular groove 108, the distance between the sliding column 110 and the axis of the end plate 107 can change back and forth. Utilizing this structural characteristic, when the guide groove 100 rotates on the end plate 107, the guide groove 100 can push the sliding column 110 to slide within the annular groove 108. Thus, the sliding column 110 pulls the active body 101 in the opposite direction to perform reciprocating motion on the guide groove 100, thereby directly converting the circular motion of the guide groove 100 into the reciprocating motion of the active body 101.

[0065] Furthermore, such as Figures 6 to 7 As shown, the magnetic attraction structure 200 includes a permanent magnet 201 disposed on the active body 101 and a magnetic guiding unit 202 disposed on the driven body 102. The permanent magnet 201 is rotatably disposed on the active body 101, and an insulating pad 203 is disposed between the permanent magnet 201 and the magnetic guiding unit 202.

[0066] Two opposing arc-shaped grooves 204 are provided on the side wall of the driven body 102. A slidable post 205 is provided in each arc-shaped groove 204. The slidable post 205 is connected to the magnetic guiding unit 202. The magnetic guiding unit 202 moves in the vertical direction and is adjusted by reversing through the arc-shaped grooves 204 and the slid post 205.

[0067] The insulating pad 203 can be installed on the permanent magnet 201 or the magnetic guiding unit 202. The insulating pad 203 can prevent the permanent magnet 201 from directly contacting the magnetic guiding unit 202, so that there is a sufficient gap between them for easy separation. The two arc-shaped grooves 204 and two deflectors 205 on the driven body 102 can guide the magnetic guiding unit 202. That is, when the two deflectors 205 move to the ends of the two arc-shaped grooves 204 on the same side, the magnetic guiding unit 202 is horizontal and the magnetic guiding unit 202 is at the same height as the permanent magnet 201. When the two deflectors 205 move to the bottom of the two arc-shaped grooves 204 respectively, the magnetic guiding unit 202 moves downward in the vertical direction and changes from a horizontal state to a vertical state. In order to make the movement of the magnetic guiding unit 202 more stable, two arc-shaped grooves 204 and two deflectors 205 can be provided on the side walls of the driven body 102 on both the front and rear sides of the magnetic guiding unit 202.

[0068] In use, since the permanent magnet 201 can rotate on the active body 101, the attraction between the permanent magnet 201 and the magnetic guiding unit 202 will cause the active body 101 to pull the driven body 102 to move laterally. At this time, the permanent magnet 201 and the magnetic guiding unit 202 are on the same horizontal straight line. When the active body 101 moves towards the center point of its trajectory, the permanent magnet 201 contacts the magnetic guiding unit 202 through the insulating pad 203, and the permanent magnet 201 pushes the magnetic guiding unit 202 from the water... The horizontal state is changed to a vertical state, which allows the magnetic guiding unit 202 to avoid the movement trajectory of the permanent magnet 201, thereby allowing the active body 101 to pass through the center point of the guide slot 100. At this time, the permanent magnet 201 is vertically downward. When the active body 101 continues to move, the permanent magnet 201 pulls the magnetic guiding unit 202 to move and restore the magnetic guiding unit 202 to a horizontal state. The direction of the magnetic guiding unit 202 changes, and the permanent magnet 201 still corresponds to the magnetic guiding unit 202.

[0069] It should be noted that since the PIN pin provides force to the driven body 102, the driven body 102 will be located at the center point of the guide slot 100 in its natural state. In order for the permanent magnet 201 to smoothly push the magnetic conductive unit 202 downward, the opening of the arc-shaped slot 204 faces upward, and the end of the arc-shaped slot 204 needs to be higher than its center point. In this way, when the permanent magnet 201 provides a pushing force to the magnetic conductive unit 202, the magnetic conductive unit 202 can be smoothly tilted and shifted downward by using the guidance of the upper part of the center point of the arc-shaped slot 204.

[0070] Furthermore, such as Figure 3 As shown, the magnetic conductive unit 202 is an electromagnet, and the magnetic conductive unit 202 is electrically connected to the conductive body 104;

[0071] The resistor plate 103 is composed of two separate plates, which are distributed on both sides of the center point of the guide groove 100 along the length of the guide groove 100. The wires 105 on the plates for connecting to external circuits are connected to the end of the plates away from the center point of the guide groove 100.

[0072] The current flowing between the resistor plate 103 and the conductor 104 can simultaneously power the magnetic conductive unit 202, causing a magnetic force to be generated inside the magnetic conductive unit 202. This magnetic force can cooperate with and attract the permanent magnet 201, thereby enhancing the force between the active body 101 and the driven body 102 during operation. When the driven body 102 moves to the middle of the guide slot 100, the conductor 104 is located between the two plates. At this time, the conductor 104 is disconnected from the resistor plate 103, and the magnetic conductive unit 202 is no longer connected to the circuit. The force between the active body 101 and the driven body 102 relies only on the magnetic attraction of the permanent magnet 201 on the magnetic conductive unit 202.

[0073] It should be noted that each sub-plate is provided with a wire 105, and each wire 105 is far from the center point of the guide groove 100, such as... Figure 3 As shown, this allows the two plates on the left and the two wires 105 to be connected to an external circuit, while the two plates on the right and the two wires 105 to be connected to another external circuit. This way, whether the driven body 102 moves to the left or to the right, the distance between the driven body 102 and the corresponding wire 105 will be shortened, the length of the plate connected to the circuit will be reduced, the current will be increased, the moving distance of the magnetic conductive unit 202 will be greater, the magnetic field it generates will be stronger, and the force between the permanent magnet 201 and the magnetic conductive unit 202 will be greater. This avoids the situation where the distance between the permanent magnet 201 and the magnetic conductive unit 202 is too large, and the magnetic force of the permanent magnet 201 alone cannot generate a sufficient attraction to the magnetic conductive unit 202.

[0074] Furthermore, such as Figure 3 , Figure 8 and Figure 9 As shown, the conductor 104 is a rolling body, which consists of a fixed disk 111 in the middle, two movable disks 112 on both sides, and several strips 113 arranged in a ring between the fixed disk 111 and the movable disks 112. Two adjacent strips 113 are connected to the fixed disk 111 and the movable disks 112 respectively, and two adjacent strips 113 are slidably connected to each other.

[0075] The partition plate is composed of several plates arranged vertically. When the fixed plate 111 and the movable plate 112 move relative to each other, the number of electrical connections between the conductor 104 and the plates can be adjusted.

[0076] By utilizing the rolling element of the conductor 104, the friction between the conductor 104 and the resistor plate 103 can be reduced, thereby reducing wear and ensuring long-term normal use of the structure. The several strips 113 between the fixed disk 111 and the movable disk 112 are arranged in a ring, and the adjacent strips 113 are staggered. In this way, when the movable disk 112 moves relative to the fixed disk 111, the adjacent strips 113 can slide relative to each other. The fixed disk 111, the movable disk 112 and the several strips 113 can always form a cylindrical shape and can always be electrically connected to the corresponding plate.

[0077] Several plates are simultaneously connected to the corresponding wires 105. Adjacent plates are insulated from each other. When the fixed disk 111 and the movable disk 112 move relative to each other, the overall length of the conductor 104 changes. At this time, the conductor 104 can only maintain an electrical connection with some plates, thereby adjusting the number of plates connected to the circuit. This facilitates the adjustment of the pulling force of the magnetic structure 200 during operation, and thus adjusts the detection sensitivity.

[0078] Specifically, such as Figure 8 and9 As shown, the fixed disk 111 can be rotatably mounted on the driven body 102 via a rotating column, and the movable disk 112 is slidably sleeved on the rotating column. The position of the movable disk 112 can be locked by a collar, slider, bolt and other structures, and its normal rotational movement can be allowed.

[0079] Furthermore, such as Figure 1 , Figure 10 and Figure 11 As shown, the needle-pulling device also includes a plurality of hydraulic cylinders 300 for driving the end plate 107 to move in the vertical direction, threaded posts 302 fixedly arranged relative to the hydraulic cylinders 300, and a connecting frame 301 arranged on the guide groove 100, wherein the connecting frame 301 is threadedly connected to the threaded posts 302.

[0080] The driven body 102 and the lever sleeve 106 are connected by a telescopic rod 303. The telescopic rod 303 includes a fixed sleeve 304 and a movable column 305, which are respectively connected to the driven body 102 and the lever sleeve 106. The end of the movable column 305 is slidably inserted into the fixed sleeve 304. An air hole 306 is provided on the side wall of the fixed sleeve 304. A baffle 307 is provided on the side wall of the fixed sleeve 304 to partially block the air hole 306. The baffle 307 opens in one direction within the air hole 306. The baffle 307 and the fixed sleeve 304 are connected by a spring piece 308.

[0081] The hydraulic cylinder 300 and the threaded column 302 can be directly fixed to the external bracket. When the hydraulic cylinder 300 moves in extension and retraction, it will drive the end plate 107 and the connecting frame 301 to move up and down synchronously. By utilizing the threaded connection between the threaded column 302 and the connecting frame 301, the connecting frame 301 can rotate while moving vertically, thereby driving the guide groove 100 to move vertically and rotate at the same time, thus achieving the effect of providing dual power to the guide groove 100.

[0082] In use, the dial sleeve 106 is fixedly connected to the PIN pin. When the end plate 107 moves upward, the end plate 107 will pull the fixed sleeve 304 upward through the driven body 102. The fixed sleeve 304 and the movable column 305 slide relative to each other, and the internal space of the fixed sleeve 304 increases. External air can be replenished into the fixed sleeve 304 through the air hole 306. At the same time, the air hole 306 restricts the airflow velocity, which will create a negative pressure state inside the fixed sleeve 304. Therefore, the fixed sleeve 304 will generate an upward lifting force on the movable column 305. This lifting force is maintained within a certain range as the fixed sleeve 304 and the movable column 305 move relative to each other. The movable column 305 transmits the lifting force to the PIN pin through the dial sleeve 106, thereby providing an upward pulling force for the PIN pin. This facilitates the detection of whether the PIN pin is loose or falls off when dialed, and can also detect the connection strength of the PIN pin. This detection method can be used simultaneously with the dial detection method described above.

[0083] To facilitate the reset of the fixed sleeve 304 and the movable column 305, a reset motor 309 can be installed inside the fixed sleeve 304. A threaded rod 310 is installed at the output end of the reset motor 309, and the threaded rod 310 is threadedly connected to the movable column 305. When the reset motor 309 is running, it uses the threaded rod 310 to pull the movable column 305 into the fixed sleeve 304, thereby retracting the telescopic rod 303. When the fixed sleeve 304 and the movable column 305 are extended, the reset motor 309 can be de-energized, thus preventing it from interfering with the normal movement of the fixed sleeve 304 and the movable column 305. When the fixed sleeve 304 and the movable column 305 are retracted, the gas inside the fixed sleeve 304 can push the baffle 307 to open and be discharged through the vent 306, thereby preventing the internal air pressure of the fixed sleeve 304 from interfering with the movement of the movable column 305. The spring plate 308 provides a reset spring force for the baffle 307.

[0084] Furthermore, such as Figure 10 As shown, a buckle 400 is provided on the driven body 102, and a turntable 401 is rotatably provided inside the buckle 400. The fixed sleeve 304 can be rotatably connected to the driven body 102 through the buckle 400 and the turntable 401. Several permanent magnets 402 and 403 that cooperate with each other are respectively provided on the inner wall of the buckle 400 and the outer wall of the turntable 401.

[0085] When a permanent magnet 3 403 moves near a corresponding permanent magnet 2 402, the permanent magnet 3 403 and the permanent magnet 2 402 attract each other. This allows the permanent magnet 3 403 to quickly approach the permanent magnet 2 402 and slowly move away from it. When the permanent magnet 3 403 approaches the next permanent magnet 2 402, it still adopts the movement pattern of quickly approaching and slowly moving away.

[0086] When the guide slot 100 rotates, the driven body 102 rotates synchronously, driving the buckle 400 to rotate. Since the turntable 401 is connected to the PIN pin through the telescopic rod 303 and the pry bar 106, the turntable 401 is restricted by the PIN pin and cannot rotate freely. That is, the buckle 400 and the turntable 401 move relative to each other. When the permanent magnet 3 403 approaches a permanent magnet 2 402, the attraction between them will cause the turntable 401 and the telescopic rod 303 to twist in the forward direction, and the PIN pin will twist in the forward direction. When the permanent magnet 3 403 moves away from the permanent magnet 2 402, the attraction between them will cause the turntable 401 and the permanent magnet 3 403 to twist in the opposite direction, that is, the PIN pin will twist in the opposite direction. In this way, with the continuous relative rotation of the permanent magnet 2 402 and the permanent magnet 3 403, the PIN pin achieves a repeated twisting motion effect. The strength of the PIN pin is detected by using this twisting motion mode.

[0087] Furthermore, such as Figure 12As shown, a plurality of side pressure bodies 114 are arranged around the axis of the shift sleeve 106 inside the shift sleeve 106, and the side pressure bodies 114 are inclined and slidably arranged. Pressure plates 115 are slidably arranged on the plurality of side pressure bodies 114, and the pressure plates 115 are connected to the shift sleeve 106 by springs 116.

[0088] Several side pressure bodies 114 are arranged in a ring and slidably disposed within the sleeve 106. Therefore, the relative sliding direction between each side pressure body 114 and the pressure plate 115 is different. At this time, the several side pressure bodies 114 can limit the pressure plate 115, preventing the pressure plate 115 from moving arbitrarily in any radial direction within the sleeve 106. The spring 116 can provide a pushing force to the pressure plate 115, so that the several side pressure bodies 114 are in a closed state. When the PIN needle is inserted between the several side pressure bodies 114 in the sleeve 106, the several side pressure bodies 114 squeeze and fix the PIN needle. Furthermore, the tilting and sliding manner of the side pressure bodies 114 can, when the sleeve 106 and the PIN needle tend to separate, utilize the friction between the side pressure bodies 114 and the PIN needle to make the several side pressure bodies 114 tend to move together, thereby automatically strengthening the clamping effect on the PIN needle.

[0089] The operating method of the automated pin-shifting device for IGBT modules includes the following steps:

[0090] The IGBT module is fixed on the test stage, and the PIN pins in the IGBT module are aligned with the switch sleeve 106.

[0091] The drive sleeve 106 moves down and is sleeved on the PIN pin, and several side pressure bodies 114 inside the sleeve 106 clamp and fix the PIN pin.

[0092] The lifting end plate 107 carries the connecting frame 301 and moves in the vertical direction, generating relative motion with the threaded column 302, and the connecting frame 301 rotates.

[0093] The connecting frame 301 drives the guide groove 100 to rotate on the end plate 107, and the sliding column 110 on the guide groove 100 slides in the annular groove 108. The sliding column 110 drives the active body 101 to slide back and forth on the guide groove 100. At this time, the active body 101 performs a composite motion of circular motion and reciprocating motion on the guide groove 100.

[0094] The active body 101 drives the driven body 102 to move using the magnetic attraction structure 200. The driven body 102 moves the PIN needle synchronously through the telescopic rod 303 and the dial sleeve 106. The PIN needle performs reciprocating swing motion in any direction.

[0095] The reaction force of the PIN pin on the sleeve 106 will restrict the movement of the driven body 102 on the guide slot 100. When the conductor 104 contacts different positions on the resistor plate 103, the resistance of the resistor plate 103 connected to the circuit changes. By detecting the resistance value of the resistor plate 103 connected to the circuit or the current value of the circuit, the reaction force on the sleeve 106 can be detected, thereby realizing the detection of the PIN pin's firmness.

[0096] When the end plate 107 moves upward, the relative movement of the fixed sleeve 304 and the movable column 305 in the telescopic rod 303, and the flow restriction effect of the air hole 306 on the gas supplied into the fixed sleeve 304, enable the telescopic rod 303 to increase the upward pulling force on the PIN pin through the pry sleeve 106, thereby detecting whether the PIN pin is loose or has fallen off.

[0097] The working method described above in this invention can effectively realize the pin detection work of the automated pin-picking device for IGBT modules, and the technical effects it can achieve are as described in the above embodiments, which will not be repeated here.

[0098] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. An automated pin deburring apparatus for IGBT modules, characterized by, The device includes a horizontally arranged guide groove and an active body and a driven body that are slidably disposed on the guide groove along its length. The active body reciprocates on the guide groove, and the active body and the driven body are connected by a magnetic attraction structure. Two resistance plates are disposed opposite to each other on the guide groove, and the resistance plates are parallel to the guide groove. The driven body is provided with conductive bodies that cooperate with the two resistance plates. The resistance plates and the conductive bodies are electrically connected to each other, and the two conductive bodies are connected to each other. The two resistance plates are connected to an external circuit through wires. The driven body is provided with a pin-moving sleeve for adjusting the needle; The needle-pulling device also includes an end plate disposed outside the guide groove, and the guide groove performs circumferential motion on the end plate; An annular groove is provided on the end face of the end plate, and the shape of the annular groove is a pattern around the axis of the end plate; A connecting rod parallel to the guide groove is provided on the active body, and a sliding column that cooperates with the annular groove is provided on the connecting rod; The magnetic attraction structure includes a permanent magnet disposed on the active body and a magnetic guiding unit disposed on the driven body. The permanent magnet is rotatably disposed on the active body, and an insulating pad is disposed between the permanent magnet and the magnetic guiding unit. Two opposing arc-shaped grooves are provided on the side wall of the driven body. A slidable pin is provided in each arc-shaped groove. The slidable pin is connected to the magnetic guiding unit. The magnetic guiding unit moves vertically and is reversing through the arc-shaped grooves and the slidable pins. The needle-pulling device also includes several hydraulic cylinders for driving the end plate to move in the vertical direction, threaded columns fixedly arranged relative to the hydraulic cylinders, and a connecting frame arranged on the guide groove, wherein the connecting frame is threadedly connected to the threaded columns. The driven body and the lever sleeve are connected by a telescopic rod. The telescopic rod includes a fixed sleeve and a movable column that are respectively connected to the driven body and the lever sleeve. The end of the movable column is slidably inserted into the fixed sleeve. An air hole is provided on the side wall of the fixed sleeve. A baffle is provided on the side wall of the fixed sleeve to partially block the air hole. The baffle opens in one direction within the air hole. The baffle is connected to the fixed sleeve by a spring piece.

2. The automated pin deburring apparatus for IGBT modules according to claim 1, characterized by, The magnetically conductive unit is an electromagnet, and the magnetically conductive unit is electrically connected to the conductive body; The resistor plate consists of two separate plates, which are distributed on both sides of the center point of the guide groove along the length of the guide groove. The wires on the plates for connecting to external circuits are connected to the end of the plates away from the center point of the guide groove.

3. The automated pin deburring apparatus for IGBT modules of claim 2, wherein, The conductor is a rolling body, which consists of a fixed disk in the middle, two movable disks on both sides, and several strips arranged in a ring between the fixed disk and the movable disks. Adjacent strips are connected to the fixed disk and the movable disks respectively, and adjacent strips are slidably connected to each other. The partition plate is composed of several pieces arranged vertically. When the fixed disk and the movable disk move relative to each other, the number of electrical connections between the conductor and the pieces can be adjusted.

4. The automated pin deburring apparatus for IGBT modules of claim 1, wherein, A buckle is provided on the driven body, and a turntable is rotatably provided inside the buckle. The fixed sleeve can be rotatably connected to the driven body through the buckle and the turntable. Several permanent magnets II and III are respectively provided on the inner wall of the buckle and the outer wall of the turntable for mutual cooperation.

5. The automated pin deburring apparatus for IGBT modules of claim 1, wherein, A plurality of side pressure bodies are arranged around the axis of the shift sleeve inside the shift sleeve, and the side pressure bodies are slidably arranged at an angle. Pressure plates are slidably arranged on the plurality of side pressure bodies, and the pressure plates are connected to the shift sleeve by springs.

6. A method for operating an automated pin deburring apparatus for IGBT modules, using the automated pin deburring apparatus for IGBT modules according to any one of claims 1 to 5, characterized in that Includes the following steps: Fix the IGBT module on the test stage, and align the PIN pins in the IGBT module with the switch sleeve; The drive sleeve moves down and is fitted onto the PIN pin, and several side pressure bodies inside the sleeve clamp and fix the PIN pin. The lifting end plate carries the connecting frame and moves vertically, generating relative motion with the threaded column, causing the connecting frame to rotate. The connecting frame drives the guide groove to rotate on the end plate, and the sliding column on the guide groove slides in the annular groove. The sliding column drives the active body to slide back and forth on the guide groove. At this time, the active body performs a composite motion of circular motion and reciprocating motion on the guide groove. The active body uses a magnetic attraction structure to drive the driven body to move. The driven body moves the PIN needle synchronously through the telescopic rod and the lever sleeve. The PIN needle performs reciprocating swing motion in any direction. The reaction force of the PIN pin on the sleeve will restrict the movement of the driven body on the guide slot. When the conductor contacts different positions on the resistor plate, the resistance of the resistor plate connected to the circuit changes. By detecting the resistance value of the resistor plate connected to the circuit or the current value of the circuit, the reaction force on the sleeve can be detected, thereby realizing the detection of the PIN pin's firmness. When the end plate moves upward, the relative movement of the fixed sleeve and the movable column in the telescopic rod, and the flow restriction effect of the air hole on the gas supplied into the fixed sleeve, enable the telescopic rod to increase the upward pulling force on the PIN pin through the pry sleeve, thereby detecting whether the PIN pin has become loose or fallen off.

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