A packaged chip resistor

Abstract

The application discloses a packaged patch resistor and relates to the technical field of resistors.The packaged patch resistor comprises a substrate main body and a resistor structure, an upper end surface of the substrate main body is provided with a resistor groove, both ends of the substrate main body are provided with electrode layers, and the outer side of the resistor structure is provided with a protection structure. The substrate main body and the resistor structure are arranged, so that the bottom resistor, the middle resistor and the top resistor are in full contact with the electrode layers, the resistor is prevented from being burnt out under a large current load, the heat dissipation effect of the patch resistor is improved, the service life of the patch resistor is prolonged, the resistor structure and the electrode layers are dispersed to three independent interfaces due to the difference in the thermal expansion coefficient, interface cracking is avoided, the bottom resistor is embedded in the resistor groove, and the bottom resistor is constrained by the side wall of the groove during drying shrinkage, so that internal stress caused by free shrinkage is avoided, and the problems of skinning and edge cracking of the resistor structure during drying are solved.

Description

Technical Field

[0001] This invention belongs to the field of resistor technology, specifically a packaged surface mount resistor. Background Technology

[0002] Surface mount resistors are leadless, tiny resistors that are directly soldered onto the pads of a printed circuit board using surface mount technology, unlike the through-hole soldering of traditional through-hole resistors. They are the most basic and widely used passive components in electronic circuits, serving functions such as current limiting, voltage division, current shunting, load matching, and impedance matching. Packaged surface mount resistors, also known as chip fixed resistors, are one of the most critical electronic components in modern electronic devices, widely used in circuit boards in almost all fields, from consumer electronics to industrial control and medical equipment. Therefore, packaged surface mount resistors are needed.

[0003] In existing packaged surface mount resistors, the resistive layer is usually fabricated on the top of the substrate. However, the resistive layer only overlaps with the upper surface of the electrode, resulting in a small contact area between the resistive layer and the electrode. This causes the current to concentrate at the edge of the electrode, creating a current congestion effect. During use, under high current loads, local overheating occurs, and in severe cases, the resistor burns out, reducing the lifespan of the surface mount resistor and failing to meet people's needs. Summary of the Invention

[0004] The present invention aims to solve the technical problems existing in the prior art; to this end, the present invention proposes a packaged surface mount resistor.

[0005] A packaged surface mount resistor includes a substrate body and a resistor structure disposed on the substrate body. The upper end face of the substrate body has a resistor groove that matches the resistor structure. Both ends of the substrate body have electrode layers that are connected to the resistor structure. The outer side of the electrode layer has a side conduction. The outer side of the resistor structure has a protective structure. The outer side of the side conduction has a barrier layer. The outer side of the barrier layer has a termination layer that is connected to the protective structure.

[0006] As a further aspect of the present invention: the resistor structure includes a bottom layer resistor that is attached to the resistor groove, a middle layer resistor disposed on the upper end face of the bottom layer resistor, and a top layer resistor disposed on the upper end face of the middle layer resistor. The upper end face of the bottom layer resistor is flush with the upper end face of the substrate body, and the two sides of the upper end face of the bottom layer resistor are seamlessly attached to the bottom end faces of the two electrode layers respectively. The lower end face of the middle layer resistor is seamlessly attached to the upper end face of the bottom layer resistor and the upper end face of the substrate body respectively. The two sides of the middle layer resistor are attached to the outer side face of the electrode layer. The upper end face of the middle layer resistor is flush with the upper end face of the electrode layer. The lower end face of the top layer resistor is seamlessly attached to the upper end face of the electrode layer and the upper end face of the middle layer resistor respectively.

[0007] As a further aspect of the present invention: the protective structure includes a dense glass passivation layer protecting the top resistor and electrode layer, a nano-ceramic reinforcement layer disposed outside the dense glass passivation layer, and a low surface energy epoxy sealing layer disposed outside the nano-ceramic reinforcement layer. The dense glass passivation layer uses a low-temperature sintered glass slurry, which forms a pinhole-free dense glass film after sintering, capable of blocking chemical corrosion. The nano-ceramic reinforcement layer uses a ceramic slurry with added nano-Al2O3 particles, which improves the hardness and wear resistance of the protective structure and prevents mechanical scratches. The low surface energy epoxy sealing layer has excellent anti-fouling, waterproof, and oil-proof properties, and drying dust and oil stains cannot adhere to the surface.

[0008] As a further aspect of the present invention: the resistive structure is prepared by hot air drying using a drying mechanism. The drying mechanism includes a drying chamber, a conveyor belt structure disposed inside the drying chamber for transporting the substrate body, and partition plates disposed on the inner wall of the drying chamber for dividing the internal space of the drying chamber. Several partition plates divide the internal space of the drying chamber into a preheating zone, a heating drying zone, a high-temperature drying zone, and a curing and slow cooling zone. Several heating tubes and air guide pipes staggered on the heating tubes are vertically arranged in each of the preheating zone, heating drying zone, high-temperature drying zone, and curing and slow cooling zone. Several protective gas branch pipes and a protective gas main pipe connected to the protective gas branch pipes are provided at the upper end of the drying chamber. Control valves are provided on the protective gas branch pipes. Several protective gas branch pipes are respectively connected to the preheating zone, heating drying zone, high-temperature drying zone, and curing and slow cooling zone, thereby adding protective gas to the preheating zone, heating drying zone, high-temperature drying zone, and curing and slow cooling zone, isolating oxygen, and effectively protecting the substrate body.

[0009] As a further aspect of the present invention: the outer wall of the heating tube is provided with a high-temperature vortex air pump connected to the air duct and an air guide box connected to the high-temperature vortex air pump. One end of the air guide box is provided with an exhaust pipe extending into the drying chamber. The air duct can blow the gas drawn in by the exhaust pipe downwards to uniformly dry the resistive structure, electrode layer and protective structure.

[0010] As a further aspect of the present invention: the air guide box is provided with an air guide cavity in the form of a cylinder, and the air guide box is provided with a filter screen plate. The filter screen plate can filter the gas drawn in by the exhaust pipe, preventing impurities in the gas from being introduced into the drying chamber again by the air guide pipe, causing secondary pollution, and can reduce the adhesion of impurities inside the air guide pipe. The air guide box is provided with a cleaning component for cleaning the filter screen plate. The cleaning component includes a scraper that is movably disposed on the outside of the filter screen plate and scrapes the filter screen plate, and cleaning brushes symmetrically disposed on the scraper. The scraper and the cleaning brushes are fixedly connected. The scraper and the cleaning brushes are both disposed on the side of the filter screen plate near the exhaust pipe. The cleaning component also includes a connecting ring that is rotatably disposed on the inner wall of the air guide box and connecting blocks symmetrically disposed on the connecting ring and connected to both ends of the scraper. When the connecting ring rotates, the scraper and the cleaning brushes rotate through the connecting blocks to clean the filter surface of the filter screen plate.

[0011] As a further aspect of the present invention: the cleaning assembly further includes a rotating ring disposed on the outside of the connecting ring and a first rotating gear for controlling the rotation of the rotating ring. The rotating ring is movably sealed to the air guide box. The inner wall of the rotating ring is aligned and connected to the outer wall of the connecting ring. An annular groove is provided on the outer wall of the rotating ring. An external toothed ring that meshes with the first rotating gear is provided in the annular groove. A first bevel gear structure is coaxially connected to the outer side of the first rotating gear. A drive motor for controlling the rotation of the first bevel gear structure is provided on the outer wall of the air guide box.

[0012] As a further aspect of the present invention: the inner bottom surface of the air guide box is provided with a feeding groove for use with the filter screen and scraper; the outer wall of the air guide box is provided with an external connector communicating with the feeding groove; the air guide box is provided with a collection box communicating with the external connector; the top of the collection box is provided with a threaded connector of the external connector; the air guide box is provided with a sealing block for use with the feeding groove; a sealing groove is provided in the air guide box to fit with the sealing block; the sealing groove is communicating with the feeding groove; one end of the sealing block is provided with a screw drive structure; one end of the screw drive structure is coaxially provided with a sealing gear; a lifting bar is movably provided in the air guide box for use with the sealing gear; a connecting groove is provided in the lifting bar; a lifting rack is provided in the connecting groove to mesh with the sealing gear; when the lifting bar moves up and down, the lifting rack controls the sealing gear to rotate, thereby controlling the sealing block to move horizontally through the screw drive structure, thus sealing or opening the feeding groove.

[0013] As a further aspect of the present invention: the air guide box has a lifting groove that fits with the lifting bar, the outer side of the lifting bar has a stop block, the air guide box has a stop groove that fits with the stop block, the stop block can prevent the lifting bar from detaching from the air guide box, the bottom end of the lifting bar has a weight block, the upper end face of the collection box has a compression ring aligned with the weight block, so that the collection box is fixed to the air guide box, the compression ring controls the lifting bar to move upward through the weight block, so that the sealing gear and the screw transmission structure control the sealing block to open the discharge groove, so that the air guide box and the collection box are connected; conversely, when the collection box is disassembled, the sealing block blocks the discharge groove.

[0014] As a further aspect of the present invention: the air guide box and the feeding groove are used in conjunction with a feeding assembly. The feeding assembly includes a second rotating gear meshing with an external gear ring and aligned with the feeding groove, and a first transmission gear coaxially connected to the second rotating gear. The side of the first transmission gear away from the second rotating gear is coaxially provided with a first reciprocating screw structure via a first transmission rod. The first transmission gear is directly opposite the center of the feeding groove. The feeding assembly also includes a first feeding tube connected to the first reciprocating screw structure and an elastic striking block connected to the first feeding tube. The air guide box has a first groove that matches the elastic striking block and the first feeding tube, so that when the first transmission gear rotates, it controls the elastic striking block to periodically strike the center of the feeding groove.

[0015] As a further aspect of the present invention: the upper part of the feeding groove has a rectangular funnel structure, and the lower part of the feeding groove has a rectangular cross-section. The feeding assembly also includes several second transmission gears arranged in a circular array and meshing on the outside of the first transmission gear. The lowermost second transmission gear is coaxially connected to the first reciprocating screw structure through the first transmission rod, so that the first feeding tube controls the elastic striking block to strike the lower part of the feeding groove. The middle second transmission gear is coaxially provided with a first gear through the second transmission rod. The first gear meshes with a first striking gear. Both ends of the first striking gear are provided with a first rotating block that is rotatably connected to the air guide box. The first rotating block is arranged in a circular array with several first striking heads that strike the sides of the feeding groove.

[0016] As a further aspect of the present invention: the uppermost second transmission gear is coaxially provided with a second bevel gear structure, the upper end of the second bevel gear structure is coaxially provided with a second gear, the outer side of the second gear is meshed with a second striking gear aligned with the material discharge groove, both the upper and lower ends of the second striking gear are provided with second rotating blocks rotatably connected to the air guide box, the second rotating blocks are provided with a plurality of second striking heads arranged in a circular array to strike the upper part of the material discharge groove; the second bevel gear structure is coaxially provided with a third transmission rod, one end of the third transmission rod is coaxially connected to a second reciprocating screw structure, the other end of the second reciprocating screw structure is provided with a second material discharge pipe connected to the elastic striking block, when the outer gear ring rotates, the material discharge assembly strikes multiple parts of the material discharge groove, causing impurities in the material discharge groove to enter the collection box.

[0017] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention, through the substrate body and resistor structure, the resistor groove and the bottom resistor are fully attached, so that the bottom resistor, middle resistor and top resistor are fully in contact with the electrode layer, avoiding the resistor burnout under high current load, improving the heat dissipation effect of the chip resistor, extending the service life of the chip resistor, and the bottom resistor, middle resistor and top resistor work together to disperse the huge shear stress generated by the difference in thermal expansion coefficient between the resistor structure and the electrode layer to three independent interfaces, avoiding interface cracking, and the resistor structure is protected by the set protective structure. The bottom resistor, middle resistor and top resistor are dried in layers. The bottom resistor can evaporate the solvent through the side in the groove. The middle resistor and top resistor are thin structures, so the solvent evaporates quickly and evenly. The bottom resistor is embedded in the resistor groove. When drying and shrinking, it is constrained by the side wall of the groove, and will not generate internal stress caused by free shrinkage. This solves the problem of peeling and edge cracking of the resistor structure during drying, extends the service life of the resistor structure, and improves the performance of the chip resistor.

[0018] (2) The present invention uses a drying mechanism, a conveyor belt structure, a heating pipe, an air guide pipe, a protective gas branch pipe, a protective gas main pipe, a high-temperature vortex air pump, an air guide box, and an exhaust pipe to uniformly dry the resistor structure. The air guide box, filter screen, scraper, and cleaning brush filter the circulating gas to prevent secondary pollution of the resistor structure. The connecting ring, rotating ring, first rotating gear, external gear ring, and first bevel gear structure control the scraper and cleaning brush to perform cleaning work. The sealing block, screw drive structure, sealing gear, lifting bar, lifting rack, stop block, weight block, and squeezing ring enable the collection box and air guide box to work together to seal or open the material groove, preventing external gas from entering the air guide box when the collection box is in place, thus improving the drying effect of the drying mechanism.

[0019] (3) The present invention uses a feeding assembly, a second rotating gear, an external gear ring and a first transmission gear in cooperation. The first transmission rod, the first reciprocating screw structure, the first feeding tube and the elastic striking block strike the lower middle part of the feeding groove, and guide the impurities in the feeding groove into the collection box. The first transmission gear, the second transmission gear, the second transmission rod, the first gear, the first striking gear, the first rotating block and the first striking head strike the two sides of the middle part of the feeding groove to assist the feeding groove in feeding. The first transmission gear, the second bevel gear structure, the second gear, the second striking gear, the second rotating block, the second striking head, the second reciprocating screw structure, the second feeding tube and the elastic striking block strike the upper part of the feeding groove, so that the feeding groove quickly guides the impurities into the collection box, prolongs the service life of the feeding groove and improves the use effect of the feeding assembly. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of the present invention.

[0021] Figure 2 This is a partial structural diagram of the substrate body and protective structure in this invention.

[0022] Figure 3 This is a partial structural diagram of the substrate body and the resistor structure in this invention.

[0023] Figure 4 This is a cross-sectional view of the substrate body and the drying mechanism in this invention.

[0024] Figure 5 This is a partial structural diagram of the drying oven and air guide box in this invention.

[0025] Figure 6 This is a partial cross-sectional view of the air guide box in this invention.

[0026] Figure 7 This is a partial structural diagram of the drying mechanism in this invention.

[0027] Figure 8 In this invention Figure 7 Enlarged view of the structure at point A in the middle.

[0028] Figure 9 This is a partial structural diagram of the external toothed ring and the collection box in this invention.

[0029] Figure 10 In this invention Figure 9 A partial structural diagram of the structure at point B in the middle.

[0030] Figure 11 This is a partial structural diagram of the sealing block and the extrusion ring in this invention.

[0031] Figure 12This is a partial structural diagram of the feeding assembly in this invention.

[0032] In the diagram: 1. Substrate body; 2. Resistor structure; 3. Resistor groove; 4. Electrode layer; 5. Side conduction; 6. Protective structure; 7. Barrier layer; 8. Termination layer; 9. Bottom layer resistor; 10. Middle layer resistor; 11. Top layer resistor; 12. Dense glass passivation layer; 13. Nano-ceramic reinforcement layer; 14. Low surface energy epoxy sealing layer; 15. Drying oven; 16. Conveyor belt structure; 17. Heating tube; 18. Air duct; 19. Protective gas branch pipe; 20. Protective gas main pipe; 21. High-temperature vortex air pump; 22. Air guide box; 23. Extraction pipe; 24. Filter screen; 25. Scraper; 26. Cleaning brush; 27. Connecting ring; 28. Rotating ring; 29. ​​First rotating gear; 30. External gear ring; 31. First bevel gear structure; 32. Drive motor; 33. 34. Collection box; 35. Connector; 36. Blocking block; 37. Screw drive structure; 38. Blocking gear; 39. Lifting bar; 40. Lifting rack; 41. Stop block; 42. Weight block; 43. Extrusion ring; 44. Second rotating gear; 45. First transmission gear; 46. First reciprocating screw structure; 47. First feed tube; 48. Elastic striking block; 49. Second transmission gear; 50. Second transmission rod; 51. First gear; 52. First striking gear; 53. First rotating block; 54. First striking head; 55. Second bevel gear structure; 56. Second gear; 57. Second striking gear; 58. Second rotating block; 59. Second striking head; 60. Second reciprocating screw structure; 61. Second feed tube; 62. Divider plate. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1 Please see Figures 1-4 This application provides a packaged surface mount resistor, including a substrate body 1 and a resistor structure 2 disposed on the substrate body 1. A resistor groove 3 matching the resistor structure 2 is formed on the upper end surface of the substrate body 1. Electrode layers 4 connected to the resistor structure 2 are provided at both ends of the substrate body 1. A side conduction 5 is provided on the outside of the electrode layer 4. A protective structure 6 is provided on the outside of the resistor structure 2. A barrier layer 7 is provided on the outside of the side conduction 5. A termination layer 8 connected to the protective structure 6 is provided on the outside of the barrier layer 7.

[0035] In this embodiment, a substrate body 1 is fabricated, and a resistor groove 3 is fabricated on the upper surface of the substrate body 1. A resistor structure 2 and an electrode layer 4 are fabricated onto the substrate body 1. A protective structure 6 is fabricated on the outside of the resistor structure 2 and the electrode layer 4. A side conduction 5, a barrier layer 7, and a termination layer 8 are fabricated onto the substrate body 1.

[0036] In this invention, the resistor structure 2 includes a bottom resistor 9 that is attached to the resistor groove 3, a middle resistor 10 disposed on the upper end surface of the bottom resistor 9, and a top resistor 11 disposed on the upper end of the middle resistor 10. The upper end surface of the bottom resistor 9 is flush with the upper end surface of the substrate body 1, and the two sides of the upper end surface of the bottom resistor 9 are seamlessly attached to the bottom end surfaces of the two electrode layers 4 respectively. The lower end surface of the middle resistor 10 is seamlessly attached to the upper end surface of the bottom resistor 9 and the upper end surface of the substrate body 1 respectively. The two sides of the middle resistor 10 are attached to the outer side surface of the electrode layer 4, and the upper end surface of the middle resistor 10 is flush with the upper end surface of the electrode layer 4. The lower end surface of the top resistor 11 is seamlessly attached to the upper end surface of the electrode layer 4 and the upper end surface of the middle resistor 10 respectively.

[0037] In this embodiment, a bottom layer resistor 9 is prepared in the resistor groove 3. While the bottom layer resistor 9 is being prepared, the electrode layer 4 is fixed to the substrate body 1. Then, a middle layer resistor 10 is prepared on the bottom layer resistor 9 and connected to the electrode layer 4. After the middle layer resistor 10 is prepared, a top layer resistor 11 is prepared on the middle layer resistor 10.

[0038] In this invention, the protective structure 6 includes a dense glass passivation layer 12 that protects the top resistor 11 and the electrode layer 4, a nano-ceramic reinforcement layer 13 disposed outside the dense glass passivation layer 12, and a low surface energy epoxy sealing layer 14 disposed outside the nano-ceramic reinforcement layer 13. The dense glass passivation layer 12 is made of low-temperature sintered glass slurry, which forms a dense glass film without pinholes after sintering, and can be used to block chemical corrosion. The nano-ceramic reinforcement layer 13 is made of ceramic slurry with added nano Al2O3 particles, which improves the hardness and wear resistance of the protective structure 6 and prevents mechanical scratches. The low surface energy epoxy sealing layer 14 has excellent anti-fouling, waterproof and oil-proof properties, and drying dust and oil stains cannot adhere to the surface.

[0039] In this embodiment, a dense glass passivation layer 12 is prepared on the top resistor 11 and the electrode layer 4. After the dense glass passivation layer 12 is prepared, a nano-ceramic reinforcement layer 13 is prepared on the dense glass passivation layer 12, and then a low surface energy epoxy sealing layer 14 is prepared on the nano-ceramic reinforcement layer 13.

[0040] Example 2 Based on Example 1, referring to Figures 4-11This is the second embodiment of the present invention. In this embodiment, the resistive structure 2 is prepared using a drying mechanism for hot air drying. The drying mechanism includes a drying chamber 15, a conveyor belt structure 16 disposed inside the drying chamber 15 and conveying the substrate body 1, and partition plates 62 disposed on the inner wall of the drying chamber 15 and dividing the internal space of the drying chamber 15. Several partition plates 62 divide the internal space of the drying chamber 15 into a preheating zone, a heating and drying zone, a high-temperature drying zone, and a curing and slow cooling zone. Temperature sensors are installed inside the preheating zone, the heating and drying zone, the high-temperature drying zone, and the curing and slow cooling zone. Each of the heating drying zone, high-temperature drying zone, and curing slow cooling zone has several vertically arranged heating tubes 17 and staggered air guide tubes 18 on the heating tubes 17. The upper end of the drying box 15 has several protective gas branch pipes 19 and a protective gas main pipe 20 connected to the protective gas branch pipes 19. The protective gas branch pipes 19 are equipped with control valves. The protective gas branch pipes 19 are respectively connected to the preheating zone, heating drying zone, high-temperature drying zone, and curing slow cooling zone, so as to add protective gas to the preheating zone, heating drying zone, high-temperature drying zone, and curing slow cooling zone, isolate oxygen, and effectively protect the substrate body 1.

[0041] In this embodiment, when the resistor structure 2 needs to be dried, the conveyor belt structure 16 is activated to control the resistor structure 2 to move inside the drying chamber 15, and the heating tube 17 is activated to heat the preheating zone, the heating drying zone, the high-temperature drying zone, and the curing and slow cooling zone. This causes the resistor structure 2 to move to the preheating zone for preheating. After preheating, it enters the heating drying zone for slow heating and drying, and then enters the high-temperature drying zone for high-temperature drying. After high-temperature drying, it enters the curing and slow cooling zone for slow cooling to eliminate the internal stress of the encapsulation. Protective gas is introduced into the preheating zone, the heating drying zone, the high-temperature drying zone, and the curing and slow cooling zone through the protective gas main pipe 20 and the protective gas branch pipe 19, respectively.

[0042] In this invention, the outer wall of the heating tube 17 is provided with a high-temperature resistant vortex air pump 21 connected to the air duct 18 and an air guide box 22 connected to the high-temperature resistant vortex air pump 21. One end of the air guide box 22 is provided with an exhaust pipe 23 that extends into the drying oven 15. The air duct 18 can blow the gas drawn in by the exhaust pipe 23 downwards to uniformly dry the resistor structure 2, the electrode layer 4 and the protective structure 6.

[0043] In this embodiment, when the heating tube 17 is started, the high-temperature vortex air pump 21 is started, and the gas inside the drying chamber 15 is drawn into the air guide box 22 through the air extraction pipe 23. Then, the gas is guided into the air guide pipe 18 through the air guide box 22, so that the gas inside the drying chamber 15 circulates.

[0044] In this invention, the air guide box 22 has a cylindrical air guide cavity and a filter plate 24. The filter plate 24 can filter the gas drawn in by the suction pipe 23, preventing impurities in the gas from being reintroduced into the drying oven 15 by the air guide pipe 18, thus avoiding secondary pollution. It can also reduce the adhesion of impurities inside the air guide pipe 18. The air guide box 22 is equipped with a cleaning component for cleaning the filter plate 24. The cleaning component includes components that are movably disposed on the outside of the filter plate 24 and scrape off impurities from the filter plate 24. The cleaning assembly includes a scraper 25 and a cleaning brush 26 symmetrically arranged on the scraper 25. The scraper 25 and the cleaning brush 26 are fixedly connected. Both the scraper 25 and the cleaning brush 26 are arranged on the side of the filter screen 24 near the air extraction pipe 23. The cleaning assembly also includes a connecting ring 27 rotatably arranged on the inner wall of the air guide box 22 and connecting blocks symmetrically arranged on the connecting ring 27 and connected to both ends of the scraper 25. When the connecting ring 27 rotates, the scraper 25 and the cleaning brush 26 rotate through the connecting blocks to clean the filter surface of the filter screen 24.

[0045] In this embodiment, when the exhaust pipe 23 draws the gas inside the drying oven 15 into the air guide box 22, the filter plate 24 filters the gas and introduces the filtered gas into the drying oven 15 for recycling. Every so often, the connecting ring 27 is rotated, causing the connecting ring 27 to drive the scraper 25 and the cleaning brush 26 to rotate. This causes the cleaning brush 26 to brush off the impurities adhering to the filter screen 24, and the scraper 25 to scrape off the impurities adhering to the filter screen 24.

[0046] The cleaning assembly of the present invention further includes a rotating ring 28 disposed outside the connecting ring 27 and a first rotating gear 29 for controlling the rotation of the rotating ring 28. The rotating ring 28 is movably sealed to the air guide box 22. The inner wall of the rotating ring 28 is aligned and connected with the outer wall of the connecting ring 27. An annular groove is provided on the outer wall of the rotating ring 28. An external toothed ring 30 that meshes with the first rotating gear 29 is provided in the annular groove. A first bevel gear structure 31 is coaxially connected to the outer side of the first rotating gear 29. A drive motor 32 for controlling the rotation of the first bevel gear structure 31 is provided on the outer wall of the air guide box 22.

[0047] In this embodiment, the drive motor 32 is started, which drives the first bevel gear structure 31 to rotate, so that the first bevel gear structure 31 drives the first rotating gear 29 to rotate, the first rotating gear 29 drives the external gear ring 30 to rotate, the external gear ring 30 drives the rotating ring 28 to rotate, the rotating ring 28 drives the connecting ring 27 to rotate, and the connecting ring 27 drives the scraper 25 and the cleaning brush 26 to rotate.

[0048] In this invention, the inner bottom surface of the air guide box 22 is provided with a feeding groove that cooperates with the filter screen plate 24 and the scraper 25. The outer wall of the air guide box 22 is provided with an external connector that communicates with the feeding groove. The air guide box 22 is provided with a collection box 33 that communicates with the external connector. The top of the collection box 33 is provided with a connector 34 that is threaded to the external connector. The air guide box 22 is provided with a sealing block 35 that cooperates with the feeding groove. The air guide box 22 is provided with a sealing groove that fits against the sealing block 35. The sealing groove communicates with the feeding groove. One end of the sealing block 35 is... The device includes a screw drive structure 36, with a sealing gear 37 coaxially mounted at one end. A lifting bar 38, which works in conjunction with the sealing gear 37, is movably mounted in the air guide box 22. The lifting bar 38 has a connecting groove, and a lifting rack 39, which meshes with the sealing gear 37, is located in the connecting groove. When the lifting bar 38 moves up or down, the lifting rack 39 controls the sealing gear 37 to rotate, thereby controlling the sealing block 35 to move horizontally through the screw drive structure 36, thus sealing or opening the material discharge groove.

[0049] In this embodiment, when the collection box 33 is removed from the air guide box 22, the collection box 33 is separated from the lifting bar 38. The lifting bar 38 drives the lifting rack 39 to move downward. The lifting rack 39 drives the sealing gear 37 to rotate. The sealing gear 37 drives the screw transmission structure 36 to work. The screw transmission structure 36 drives the sealing block 35 to move towards the material groove, so that the sealing block 35 seals the material groove and prevents the air guide box 22 from communicating with the outside air.

[0050] In this invention, the air guide box 22 has a lifting groove that fits with the lifting bar 38. The outer side of the lifting bar 38 is provided with a stop block 40. The air guide box 22 has a stop groove that fits with the stop block 40. The stop block 40 can prevent the lifting bar 38 from detaching from the air guide box 22. The bottom end of the lifting bar 38 is provided with a weight block 41. The upper end face of the collection box 33 is provided with a compression ring 42 aligned with the weight block 41, so that the collection box 33 is fixed to the air guide box 22. The compression ring 42 controls the lifting bar 38 to move upward through the weight block 41, so that the sealing gear 37 and the screw transmission structure 36 control the sealing block 35 to open the discharge groove, so that the air guide box 22 and the collection box 33 are connected. Conversely, when the collection box 33 is disassembled, the sealing block 35 blocks the discharge groove.

[0051] In this embodiment, when the collection box 33 is installed on the air guide box 22, so that the connector 34 is threadedly connected to the external connector, the collection box 33 drives the extrusion ring 42 to move upward, the extrusion ring 42 drives the lifting bar 38 to move upward, the lifting bar 38 drives the lifting rack 39 to move upward, the lifting rack 39 drives the sealing gear 37 to rotate, the sealing gear 37 drives the screw transmission structure 36 to work, the screw transmission structure 36 drives the sealing block 35 to move out of the feeding groove, opening up the feeding groove, so that the air guide box 22 and the collection box 33 are connected.

[0052] Example 3 Based on Example 2, referring to Figure 6 and Figures 10-12 This is the third embodiment of the present invention. In this embodiment, the air guide box 22 is used in conjunction with the feeding groove to form a feeding assembly. The feeding assembly includes a second rotating gear 43 that meshes with the external gear ring 30 and is aligned with the feeding groove, and a first transmission gear 44 that is coaxially connected to the second rotating gear 43. The side of the first transmission gear 44 away from the second rotating gear 43 is coaxially provided with a first reciprocating screw structure 46 through a first transmission rod 45. The first transmission gear 44 is directly opposite the center of the feeding groove. The feeding assembly also includes a first feeding tube 47 connected to the first reciprocating screw structure 46 and an elastic striking block 48 connected to the first feeding tube 47. The air guide box 22 has a first groove that matches the elastic striking block 48 and the first feeding tube 47, so that when the first transmission gear 44 rotates, it controls the elastic striking block 48 to periodically strike the center of the feeding groove.

[0053] In this embodiment, when the external gear ring 30 rotates, it drives the second rotating gear 43 to rotate, which in turn drives the first transmission gear 44 to rotate. The first transmission gear 44 then drives the first transmission rod 45 to rotate, which in turn drives the first reciprocating screw structure 46 to work. This causes the first reciprocating screw structure 46 to drive the first feeding tube 47 to reciprocate. The first feeding tube 47 then drives the elastic striking block 48 to strike the feeding groove, thus guiding the impurities in the feeding groove into the collection box 33.

[0054] In this invention, the upper part of the feeding groove has a rectangular funnel structure, and the lower part of the feeding groove has a rectangular cross-section. The feeding assembly also includes several second transmission gears 49 arranged in a circular array and meshing outside the first transmission gear 44. The number of second transmission gears 49 is set to four. The lowermost second transmission gear 49 is coaxially connected to the first reciprocating screw structure 46 through the first transmission rod 45, so that the first feeding tube 47 controls the elastic striking block 48 to strike the lower part of the feeding groove. The middle second transmission gear 49 is coaxially provided with a first gear 51 through the second transmission rod 50. The first gear 51 meshes with a first striking gear 52. Both ends of the first striking gear 52 are provided with a first rotating block 53 that is rotatably connected to the air guide box 22. The first rotating block 53 is arranged in a circular array with several first striking heads 54 that strike the sides of the feeding groove.

[0055] In this embodiment, when the first transmission gear 44 rotates, it drives several second transmission gears 49 to rotate, which in turn drives the first transmission rod 45 to rotate. The first transmission rod 45 controls the first reciprocating screw structure 46 to work, which in turn causes the first feeding tube 47 to control the elastic striking block 48 to strike the lower part of the feeding groove. The other second transmission gear 49 drives the second transmission rod 50 to rotate, which in turn drives the first gear 51 to rotate. The first gear 51 drives the first striking gear 52 to rotate, which in turn drives the first rotating block 53 to rotate. The first rotating block 53 drives the first striking head 54 to rotate, which in turn strikes both sides of the feeding groove, assisting the feeding groove in guiding impurities into the collection box 33.

[0056] In this invention, the uppermost second transmission gear 49 is coaxially provided with a second bevel gear structure 55, and the upper end of the second bevel gear structure 55 is coaxially provided with a second gear 56. The outer side of the second gear 56 is meshed with a second striking gear 57 aligned with the material feeding groove. The upper and lower ends of the second striking gear 57 are provided with second rotating blocks 58 rotatably connected to the air guide box 22. The second rotating blocks 58 are provided with a plurality of second striking heads 59 arranged in a circular array to strike the upper part of the material feeding groove. The second bevel gear structure 55 is coaxially provided with a third transmission rod, one end of which is coaxially connected to a second reciprocating screw structure 60. The other end of the second reciprocating screw structure 60 is provided with a second feeding pipe 61 connected to the elastic striking block 48. When the outer gear ring 30 rotates, the feeding assembly strikes multiple parts of the material feeding groove, causing impurities in the material feeding groove to enter the collection box 33. The air guide box 22 has a second groove that matches the first striking head 54 and the second striking head 59.

[0057] In this embodiment, the second transmission gear 49 drives the second bevel gear structure 55 to rotate, the second bevel gear structure 55 drives the second gear 56 to rotate, the second gear 56 drives the second striking gear 57 to rotate, the second striking gear 57 drives the second rotating block 58 to rotate, the second rotating block 58 drives several second striking heads 59 to rotate, so that the second striking heads 59 strike the upper part of the material discharge groove. When the second bevel gear structure 55 rotates, it drives the third transmission rod to rotate, the third transmission rod drives the second reciprocating screw structure 60 to work, the second reciprocating screw structure 60 drives the second material discharge tube 61 to reciprocate, so that the second material discharge tube 61 drives the elastic striking block 48 to move, so that the elastic striking block 48 strikes the upper part of the material discharge groove.

[0058] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A packaged surface mount resistor, characterized in that, include: A substrate body, wherein a resistor groove is formed in the middle of the upper end surface of the substrate body; Electrode layers are disposed at both ends of the substrate body; The bottom resistor is fitted into the resistor groove and connected to the lower end face of the electrode layer. The middle layer resistor is set on the upper end face of the bottom layer resistor and is attached to the inner side face of the two electrode layers respectively. The top layer resistor is located on the upper surface of the middle layer resistor and is connected to the upper surface of the electrode layer. The protective structure is mounted on the substrate body and is bonded to the top layer resistor.

2. The packaged surface mount resistor according to claim 1, characterized in that, The protective structure includes: A dense glass passivation layer is connected to the upper surface of the top resistor and electrode layer; A nano-ceramic reinforcement layer is disposed on top of a dense glass passivation layer; A low surface energy epoxy sealing layer is disposed on the upper end of the nano-ceramic reinforcement layer; The dense glass passivation layer is made of low-temperature sintered glass slurry, which forms a dense glass film without pinholes after sintering. The nano-ceramic reinforcing layer is made of ceramic slurry with added nano-Al2O3 particles.

3. The packaged surface mount resistor according to claim 2, characterized in that, The bottom layer resistor, the middle layer resistor, and the top layer resistor together form a resistor structure; The resistor structure is dried in a drying oven; The drying oven is equipped with a conveyor belt structure for transporting the substrate body. The drying oven is equipped with several partitions for dividing the space. The drying chamber is equipped with several heating tubes evenly distributed inside; An air duct is offset above the heating tube; The upper end of the drying oven is equipped with a protective gas main pipe; The main protective gas pipe is equipped with several branch protective gas pipes that are aligned with and connected to the drying oven.

4. A packaged surface mount resistor according to claim 3, characterized in that, The outer side of the drying box is equipped with a high-temperature vortex air pump that is connected to the air duct. The lower side of the high-temperature vortex air pump is connected to an air guide box; One end of the air guide box is provided with an air extraction pipe that extends into the interior of the drying oven; The air guide box is provided with an air guide cavity in the form of a cylinder; The air guide cavity is fitted with a filter screen plate to filter the gas drawn in by the air extraction pipe.

5. A packaged surface mount resistor according to claim 4, characterized in that, The air guide box is equipped with a scraper for cleaning the filter screen. The scraper is symmetrically fixed with cleaning brushes that fit against the filter screen. Both the scraper and the cleaning brush are located on the side of the filter screen plate near the exhaust pipe. The air guide box is rotatably equipped with a connecting ring; The connecting ring is fixed to the scraper by a connecting block.

6. A packaged surface mount resistor according to claim 5, characterized in that, The outer side of the connecting ring is provided with a rotating ring that is movably sealed with the air guide box; The outer wall of the rotating ring is provided with an annular groove; An external toothed ring is installed in the annular groove; The air guide box is equipped with a first rotating gear that meshes with the external gear ring. One end of the first rotating gear is coaxial with a first bevel gear structure; The outer wall of the air guide box is equipped with a drive motor that controls the rotation of the first bevel gear structure.

7. A packaged surface mount resistor according to claim 6, characterized in that, The inner bottom surface of the air guide box is provided with a material feeding groove that works in conjunction with the filter screen and scraper. The outer wall of the air guide box is provided with an external connector that communicates with the material discharge groove. The air guide box is equipped with a collection box connected to an external connector; The air guide box is equipped with a sealing block that works in conjunction with the material discharge groove; One end of the sealing block is equipped with a screw drive structure; One end of the lead screw drive structure is coaxially equipped with a blocking gear. The air guide box is equipped with a lifting bar that works in conjunction with the sealing gear; The lifting bar is equipped with a lifting rack that meshes with the sealing gear; The bottom end of the lifting bar is equipped with a weight block; The upper surface of the collection box is provided with a compression ring aligned with the weight block.

8. A packaged surface mount resistor according to claim 7, characterized in that, The air guide box is provided with a second rotating gear aligned with the material discharge groove; The second rotating gear meshes with the external gear ring; One end of the second rotating gear is coaxially connected to the first transmission gear; The first transmission gear is coaxially provided with a first reciprocating lead screw structure via a first transmission rod; The first reciprocating screw structure is connected to the first feed tube; One end of the first feeding tube is provided with an elastic striking block that strikes the center of the feeding groove.

9. A packaged surface mount resistor according to claim 8, characterized in that, The upper part of the feeding groove has a rectangular funnel structure; The lower cross-section of the feeding groove has a rectangular structure; The outer side of the first transmission gear is meshed with several second transmission gears in a circular array; The second transmission gear at the bottom is coaxially connected to the first reciprocating screw structure through the first transmission rod, which causes the first feeding tube to control the elastic striking block to strike the lower part of the feeding groove; The second transmission gear on the middle side is coaxially mounted with the first gear via the second transmission rod; The first gear meshes with a first striking gear; Both ends of the first striking gear are provided with a first rotating block that is rotatably connected to the air guide box; The first rotating block is arranged in a circular array and has several first striking heads that strike both sides of the feeding groove.

10. A packaged surface mount resistor according to claim 9, characterized in that, A second bevel gear structure is coaxially provided at one end of the uppermost second transmission gear; The second bevel gear structure has a second gear coaxially mounted on its upper end; The outer side of the second gear is engaged with a second striking gear that is aligned with the material feeding groove; The upper and lower ends of the second striking gear are provided with second rotating blocks that are rotatably connected to the air guide box; The second rotating block is provided with several second striking heads arranged in a circular array to strike the upper part of the feeding groove; The second bevel gear structure is coaxially connected to the second reciprocating lead screw structure via the third transmission rod; The other end of the second reciprocating screw structure is provided with a second feed tube connected to the elastic striking block.

Images