High-precision SMD MELF thermistor function testing machine

Abstract

The invention discloses a high-precision SMD MELF thermistor function testing machine. The high-precision SMD MELF thermistor function testing machine comprises a rack; the constant-temperature oil tank is arranged on the rack, and a temperature equalizing pump is arranged on the constant-temperature oil tank; the material distributing mechanism comprises a magnetic groove and a material distributing disc, the magnetic groove is formed in the rack, the material distributing disc is located at one end of the magnetic groove, the material distributing disc is rotationally connected to the rack, a plurality of first material grooves are formed in the material distributing disc at equal intervals in the circumferential direction of the material distributing disc, and a first magnetic block is arranged at one end of each first material groove; the test material distribution disc is rotationally connected to the rack, a plurality of second material grooves are formed in the test material distribution disc at equal intervals in the circumferential direction of the test material distribution disc, a second magnetic block is arranged at one end of each second material groove, the second material grooves are right opposite to the first material grooves at the transfer points of the material distribution disc and the test material distribution disc, and the partial area of the bottom of the test material distribution disc is located in the constant-temperature oil groove. Compared with the prior art, the MELF thermistor resistance testing device can solve the problems that an existing MELF thermistor resistance testing device is low in efficiency and poor in precision.

Description

Technical Field

[0001] This invention relates to the field of thermistor testing technology, and in particular to a high-precision surface mount MELF thermistor functional testing machine. Background Technology

[0002] MELF thermistors are negative temperature coefficient (NTC) thermistors packaged in MELF (Metal Electrode Without Leads) packages. Their resistance decreases as temperature increases, exhibiting high accuracy, fast response, and good stability. They are widely used in power management, battery protection, temperature sensing, and other fields, and are particularly suitable for electronic devices requiring precise temperature control.

[0003] As the application range of thermistors continues to expand, users are demanding more and more thermistor testing items, such as parallel current, surface temperature, withstand voltage, single-chip current, and resistance value.

[0004] Currently, all equipment used for testing the resistance of MELF thermistors is manually operated. In mass production, this manually operated equipment has revealed drawbacks such as low efficiency, inaccurate control, and a high rate of product scrap during testing. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision surface mount MELF thermistor functional tester to solve the problems of low efficiency and poor accuracy in existing MELF thermistor resistance testing.

[0006] To achieve the above objectives, the present invention provides a high-precision surface mount MELF thermistor functional testing machine, comprising: frame; A constant temperature oil bath is mounted on the frame, and a temperature equalization pump is installed on the constant temperature oil bath. The material dispensing mechanism includes a magnetic groove and a dispensing plate. The magnetic groove is disposed on the frame, and the dispensing plate is located at one end of the magnetic groove. The dispensing plate is rotatably connected to the frame. The dispensing plate is provided with a plurality of first material grooves at equal intervals along its circumference. A first magnetic block is disposed at one end of each first material groove. The test material distribution plate is rotatably connected to the frame. The test material distribution plate is provided with several second material slots at equal intervals along its circumference. A second magnetic block is provided at one end of each second material slot. At the junction of the material distribution plate and the test material distribution plate, the second material slot is directly opposite the first material slot. A portion of the bottom area of ​​the test material distribution plate is located in the constant temperature oil tank. The transfer mechanism includes a support base, a strong magnetic clamp, and a strong magnet. The support base is fixedly connected to the frame, the strong magnetic clamp is connected to the support base, and the strong magnet is disposed on the strong magnetic clamp. The strong magnet is located above the second material trough on one side of the transfer point. The testing mechanism includes a top-opening cylinder, a push rod, a guide rail seat, a linear guide rail, an insulating seat, and a test piece. The top-opening cylinder is connected to the frame, the push rod is connected to the top-opening cylinder, and insulating seats are respectively provided on both sides of the top-opening cylinder. The test piece is placed on the insulating seat, the insulating seat is slidably connected to the corresponding linear guide rail, the linear guide rail is mounted on the guide rail seat, and a spring is provided between the guide rail seat and the insulating seat. A receiving mechanism, used for receiving and testing products.

[0007] As a further description of the above technical solution: The material receiving mechanism includes an air blowing seat, a pressure boosting seat, a pressure boosting pipe, and a material receiving box. The air blowing port of the air blowing seat is directly opposite one end of the second material trough, the pressure boosting pipe is directly opposite the other end of the second material trough, the material outlet of the pressure boosting pipe is located inside the material receiving box, and the pressure boosting seat is mounted on the pressure boosting pipe.

[0008] As a further description of the above technical solution: The frame is equipped with a protective bow, the bottom of which abuts against the edge of the test distribution plate, and the protective bow is equipped with multiple air blowing seats.

[0009] As a further description of the above technical solution: The receiving box is equipped with a receiving basket.

[0010] As a further description of the above technical solution: A stepper motor is installed inside the frame, and the test distribution plate is mounted on the drive shaft of the stepper motor.

[0011] As a further description of the above technical solution: A synchronous pulley is provided on the drive shaft, and a conversion gear is provided on the frame. The conversion gear and the synchronous pulley are driven by a belt, and the conversion gear meshes with the power gear of the material distribution plate on the material distribution plate.

[0012] As a further description of the above technical solution: The number of teeth on the conversion gear is twice the number of teeth on the distribution disc power gear.

[0013] As a further description of the above technical solution: The bottom of the constant temperature oil tank is equipped with a lifting component, which drives the constant temperature oil tank to move vertically.

[0014] As a further description of the above technical solution: A tester is mounted on the frame, and the tester is electrically connected to the test piece.

[0015] As a further description of the above technical solution: Centrifuge discs are installed on the frame.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, the MELF thermistor is tested in constant temperature oil through the set frame, centrifugal disc, magnetic tank, material distribution mechanism, transfer mechanism, testing mechanism, material receiving mechanism and constant temperature oil tank, which has extremely high stability, ultra-precision and high efficiency.

[0017] 2. In this invention, the products in the material trough of the sorting tray can be transferred to the test sorting tray through the set transfer mechanism. The size of the sorting tray and the test sorting tray are determined according to the rotation angle, and it is necessary to ensure that both material troughs of the sorting tray and the test sorting tray arrive at the transfer point at the same time. The test sorting tray is made of PEK insulating material, and like the sorting tray, each material trough has a corresponding magnetic particle to attract the product into the trough. When the sorting tray brings the product to the transfer point, the strong magnet attracts the product into the corresponding material trough of the test sorting tray. The tray continues to rotate. Since the strong magnet is fixed, the torque during rotation separates the product from the strong magnet, allowing the corresponding magnetic particle on the test sorting tray to attract the product into the trough, thus completing the automatic sorting of the product. The product is fixed by magnetic attraction, which can prevent product damage.

[0018] 3. In this invention, the resistance value of a product can be tested through a testing mechanism. The push-open cylinder drives the push rod to move, which pushes the slider on the linear guide rail open. The test pieces at both ends are installed on the insulating base, which is connected to the slider. Therefore, when the slider of the linear guide rail is pushed open, the test pieces separate, so the test pieces do not contact the test sorting tray. When the test sorting tray brings the product to the test point, the cylinder retracts, and the sliders at both ends of the linear guide rail move closer to the middle under the elastic force of the springs on both sides, causing the test pieces to contact the two ends of the resistor. The tester tests the product and sends the test mechanism to the control system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a high-precision surface mount MELF thermistor functional testing machine. Figure 1 .

[0021] Figure 2This is a schematic diagram of the structure of a high-precision surface mount MELF thermistor functional testing machine. Figure 2 .

[0022] Figure 3 This is a front view of a high-precision surface mount MELF thermistor functional testing machine.

[0023] Figure 4 This is a schematic diagram of the connection structure between the material dispensing mechanism and the test material dispensing tray in a high-precision surface mount MELF thermistor functional tester.

[0024] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0025] Figure 6 This is a schematic diagram of the transfer mechanism in a high-precision surface mount MELF thermistor functional testing machine.

[0026] Figure 7 This is a schematic diagram of the testing mechanism in a high-precision surface mount MELF thermistor functional testing machine.

[0027] Figure 8 This is a schematic diagram of the receiving mechanism in a high-precision surface mount MELF thermistor functional testing machine.

[0028] Figure 9 This is a schematic diagram of the receiving box in a high-precision surface mount MELF thermistor functional testing machine.

[0029] Figure 10 This is a schematic diagram of the stepper motor connection structure in a high-precision surface mount MELF thermistor functional testing machine.

[0030] Figure 11 This is a structural diagram of a product in a high-precision surface mount MELF thermistor functional testing machine.

[0031] Legend: 1. Frame; 2. Constant temperature oil bath; 21. Irradiation pump; 3. Material distribution mechanism; 31. Magnetic trough; 32. Material distribution plate; 33. First material trough; 34. First magnetic block; 4. Test material distribution plate; 41. Second material trough; 42. Second magnetic block; 5. Transfer mechanism; 51. Support base; 52. Strong magnetic clamp; 53. Strong magnet; 6. Test mechanism; 61. Push-opening cylinder; 62. Push rod; 63. Guide rail base; 64. Linear guide 65. Rail; 66. Insulating base; 67. Test piece; 78. Spring; 79. Receiving mechanism; 70. Air blowing base; 71. Pressure boosting base; 72. Pressure boosting pipe; 73. Receiving box; 80. Product; 91. Protective bow; 10. Receiving basket; 11. Stepper motor; 12. Synchronous pulley; 13. Conversion gear; 14. Belt; 15. Distribution disc power gear; 16. Lifting component; 17. Tester; 18. Centrifugal disc; 19. Protective plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of the embodiments of the present invention, it should be noted that the terms "upper" and "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, 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 limiting the present invention.

[0036] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1:

[0037] Please see Figure 1-11 This invention provides a high-precision surface mount MELF thermistor functional testing machine, comprising: Rack 1; A constant temperature oil bath 2 is mounted on the frame 1, and a temperature equalization pump 21 is mounted on the constant temperature oil bath 2. After the test oil passes through the constant temperature oil bath, it is injected into the oil bath by a circulation pump. The oil in the oil bath is then pumped by a temperature equalization pump to ensure that the temperature of the entire oil remains constant, and the temperature of the product testing process is controlled within ±0.02℃ of the test set temperature. The material dispensing mechanism 3 includes a magnetic groove 31 and a dispensing plate 32. The magnetic groove 31 is disposed on the frame 1, and the dispensing plate 32 is located at one end of the magnetic groove 31. The dispensing plate 32 is rotatably connected to the frame 1. The dispensing plate 32 is provided with a plurality of first material grooves 33 at equal intervals along its circumference. A first magnetic block 34 is disposed at one end of each first material groove 33. A protective plate 19 is disposed on the top of the dispensing plate 32. The protective plate can be fixed on the frame to prevent the products in the first material grooves from falling off. The test material distribution plate 4 is rotatably connected to the frame 1. The test material distribution plate 4 is provided with a plurality of second material grooves 41 at equal intervals along its circumference. A second magnetic block 42 is provided at one end of each second material groove 41. At the junction of the material distribution plate 32 and the test material distribution plate 4, the second material groove 41 is directly opposite the first material groove 33. The bottom part of the test material distribution plate 4 is located in the constant temperature oil tank 2. The transfer mechanism 5 includes a support base 51, a strong magnetic clamp 52 and a strong magnet 53. The support base 51 is fixedly connected to the frame 1, the strong magnetic clamp 52 is connected to the support base 51, and the strong magnet 53 is disposed on the strong magnetic clamp 52. The strong magnet 53 is located above the second material trough 41 on one side of the transfer point. The testing mechanism 6 includes a top-opening cylinder 61, a top rod 62, a guide rail seat 63, a linear guide rail 64, an insulating seat 65, and a test piece 66. The top-opening cylinder 61 is connected to the frame 1, and the top rod 62 is connected to the top rod cylinder 62. Insulating seats 65 are respectively provided on both sides of the top-opening cylinder 61. The test piece 66 is disposed on the insulating seat 65. The insulating seat 65 is slidably connected to the corresponding linear guide rail 64. The linear guide rail 64 is mounted on the guide rail seat 63. A spring 67 is provided between the guide rail seat 63 and the insulating seat 65. The receiving mechanism 7, which is used to collect and test the product 8.

[0038] Specifically, a lifting component 16 is provided at the bottom of the constant temperature oil bath 2, which drives the constant temperature oil bath 2 to move vertically. The lifting component is a screw lifting mechanism, or it can be a cylinder. The lifting mechanism allows the product to reach the required test oil level; this enables precise control of the test temperature and ensures accurate test results.

[0039] A tester 17 is mounted on the frame 1, and the tester 17 is electrically connected to the test piece 66.

[0040] The frame 1 is equipped with a centrifugal disc 18. The product is manually poured into the centrifugal disc, and the vibrating disc automatically arranges the product in an orderly manner and sends it to the magnetic trough. The magnetic trough uses the properties of magnets to suspend the product and bring it close to the dispensing disc. The dispensing disc is made of copper, and each trough corresponds to a magnetic particle. When the dispensing disc rotates, each trough passes through the magnetic trough, and the trough magnetically attracts the product into the trough, which holds only one particle at a time. Driven by a power source, the dispensing disc brings the product to the transfer point. To prevent the product from detaching during rotation, a protective plate is used.

[0041] Working principle: The product is manually poured into the centrifugal disc; the centrifugal disc arranges the product in an orderly manner and sends it to the magnetic trough; the magnetic trough suspends the product and places it against the edge of the distributing disc; the distributing disc rotates under power, and the magnets corresponding to each trough attract the product, with each trough holding only one product; the transfer mechanism transfers the product from the distributing disc to the testing disc; the testing distributing disc, driven by power, brings the product to the testing point. The power of the testing distributing disc is the same as that of the distributing disc, utilizing speed ratio and direction conversion to keep the troughs of the two discs at the intersection point. The test uses a four-wire pressure test; the tested products are classified according to the test parameters, up to 6 categories, using compressed air to blow out the classification mechanism, with pipes leading to the receiving box; a double-box collection system is used, one for filtering and the other for oil storage, filtering the oil from the product into the oil storage box. Example 2:

[0042] See Figure 1-11The figure shows a high-precision surface-mount MELF thermistor functional testing machine provided by Embodiment 2 of the present invention. This embodiment further improves upon the above embodiments by making the following technical improvements: The receiving mechanism 7 includes an air blowing seat 71, a pressure boosting seat 72, a pressure boosting tube 73, and a receiving box 74. The air blowing port of the air blowing seat 71 faces one end of the second material trough 41, and the pressure boosting tube 73 faces the other end of the second material trough 41. The discharge end of the pressure boosting tube 73 is located inside the receiving box 74, and the pressure boosting seat 72 is disposed on the pressure boosting tube 73. A protective arch 9 is provided on the frame 1, the bottom of which abuts against the edge of the test distribution tray 4. Multiple air blowing seats 71 are disposed on the protective arch 9. Specifically, the receiving mechanism is used to classify products according to pre-set results. The system performs precise calculations on the tested structure and classifies the products based on the calculation results and set parameters, issuing instructions accordingly. The air supply to the blowing nozzles comes from corresponding solenoid valves. When the solenoid valves are energized, they open to supply air to the nozzles, blowing the products out of the test sorting tray and into the corresponding pressurization pipeline. The pressurization pipeline then sends the products into the receiving box. The product classification is set at 5 categories plus one defective category, for a total of 6 categories. Oil mist is generated during blowing, so a mist-collecting hood is added above the blowing mechanism. To prevent products from detaching during operation, a protective arch is used to keep the products within the tray. Example 3:

[0043] See Figure 1-11 The figure shows a high-precision surface mount MELF thermistor functional tester provided by the present invention in Embodiment 3. Based on the above embodiments, the present invention further improves the following technical solution: a receiving basket 10 is provided inside the receiving box 74.

[0044] After the product is blown into the pressurization pipe, the pressurized air is turned on, blowing the product into the material box. Because the products on the test and sorting conveyor belt are definitely covered with oil after the oil test, the oil is carried into the material box from the pressurization pipe while the air is blowing through the nozzle. The double material box, consisting of a receiving box and a receiving basket, aims to separate the oil brought by the product from the product as much as possible. The upper receiving basket is made of 60-mesh stainless steel mesh, and the lower receiving box is made of stainless steel plate. Each time a material is retrieved manually, the oil in the oil storage box must be emptied before it is placed into the receiving position. Example 4:

[0045] See Figure 1-11The figure shows a high-precision surface-mount MELF thermistor functional testing machine provided by Embodiment 4 of the present invention. This embodiment further improves upon the previous embodiments by the following technical solutions: A stepper motor 11 is installed inside the frame 1, and the test distribution plate 4 is mounted on the drive shaft of the stepper motor 11. A synchronous pulley 12 is mounted on the drive shaft, and a conversion gear 13 is mounted on the frame 1. The conversion gear 13 and the synchronous pulley 12 are driven by a belt 14, and the conversion gear 13 meshes with a distribution plate drive gear 15 on the distribution plate. The number of teeth on the conversion gear 13 is twice the number of teeth on the distribution plate drive gear 15. With the above structure, the stepper motor can drive the sorting tray and the test sorting tray to rotate. Specifically, the stepper motor rotates in an indexing manner, and the fiber optic sensor sends a signal to directly drive the test sorting tray to rotate. The stepper motor directly drives the test sorting tray to rotate, and at the same time, the synchronous pulley drives the adapter gear to rotate. The adapter gear then drives the sorting tray power gear to rotate, thus changing the direction of rotation of the sorting tray and the test sorting tray to opposite directions. The number of teeth of the adapter gear is twice the number of teeth of the sorting tray power gear, so that the 40 material slots of the sorting tray and the 80 material slots of the test sorting tray can be aligned at the transfer point.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-precision surface mount MELF thermistor functional testing machine, characterized in that... ,include: frame; A constant temperature oil bath is installed on the frame, and a temperature equalization pump is installed on the constant temperature oil bath; The material dispensing mechanism includes a magnetic groove and a dispensing plate. The magnetic groove is disposed on the frame, and the dispensing plate is located at one end of the magnetic groove. The dispensing plate is rotatably connected to the frame. The dispensing plate is provided with a plurality of first material grooves at equal intervals along its circumference. A first magnetic block is disposed at one end of each first material groove. The test material distribution plate is rotatably connected to the frame. The test material distribution plate is provided with several second material slots at equal intervals along its circumference. A second magnetic block is provided at one end of each second material slot. At the junction of the material distribution plate and the test material distribution plate, the second material slot is directly opposite the first material slot. A portion of the bottom area of ​​the test material distribution plate is located in the constant temperature oil tank. The transfer mechanism includes a support base, a strong magnetic clamp, and a strong magnet. The support base is fixedly connected to the frame, the strong magnetic clamp is connected to the support base, and the strong magnet is disposed on the strong magnetic clamp. The strong magnet is located above the second material trough on one side of the transfer point. The testing mechanism includes a top-opening cylinder, a push rod, a guide rail seat, a linear guide rail, an insulating seat, and a test piece. The top-opening cylinder is connected to the frame, the push rod is connected to the top-opening cylinder, and insulating seats are respectively provided on both sides of the top-opening cylinder. The test piece is placed on the insulating seat, the insulating seat is slidably connected to the corresponding linear guide rail, the linear guide rail is mounted on the guide rail seat, and a spring is provided between the guide rail seat and the insulating seat. A receiving mechanism, used for receiving and testing products.

2. The high-precision surface mount MELF thermistor functional testing machine according to claim 1, characterized in that... The receiving mechanism includes an air blowing seat, a pressure boosting seat, a pressure boosting pipe, and a receiving box. The air blowing port of the air blowing seat is directly opposite one end of the second material trough, the pressure boosting pipe is directly opposite the other end of the second material trough, the discharge end of the pressure boosting pipe is located inside the receiving box, and the pressure boosting seat is disposed on the pressure boosting pipe.

3. A high-precision surface mount MELF thermistor functional testing machine according to claim 2, characterized in that... The frame is equipped with a protective bow, the bottom of which abuts against the edge of the test distribution plate, and the protective bow is equipped with multiple air blowing seats.

4. A high-precision surface mount MELF thermistor functional testing machine according to claim 2, characterized in that... The receiving box is equipped with a receiving basket.

5. A high-precision surface mount MELF thermistor functional testing machine according to claim 1, characterized in that... A stepper motor is installed inside the frame, and the test distribution plate is mounted on the drive shaft of the stepper motor.

6. A high-precision surface mount MELF thermistor functional testing machine according to claim 5, characterized in that... A synchronous pulley is provided on the drive shaft, and a conversion gear is provided on the frame. The conversion gear and the synchronous pulley are driven by a belt, and the conversion gear meshes with the power gear of the material distribution plate on the material distribution plate.

7. A high-precision surface mount MELF thermistor functional testing machine according to claim 6, characterized in that... The number of teeth on the conversion gear is twice the number of teeth on the distribution disc power gear.

8. A high-precision surface mount MELF thermistor functional testing machine according to claim 1, characterized in that... The bottom of the constant temperature oil tank is equipped with a lifting component, which drives the constant temperature oil tank to move vertically.

9. A high-precision surface mount MELF thermistor functional testing machine according to claim 1, characterized in that... A tester is mounted on the frame, and the tester is electrically connected to the test piece.

10. A high-precision surface mount MELF thermistor functional testing machine according to claim 1, characterized in that... Centrifuge discs are installed on the frame.

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