Precise positioning device and method for UV printing of first protective layer of chip resistor

Abstract

The invention discloses an accurate positioning device and method for UV printing of a first protective layer of a chip resistor, and relates to the technical field of chip resistor printing, the accurate positioning device comprises a printing mechanism, a positioning mechanism and a front-back correction mechanism are arranged in the printing mechanism, and a pressure detection mechanism is arranged in the positioning mechanism. When the printing base is used, the hydraulic rod pulls the lower pressing plate to move downwards, downward thrust is generated to the bottom ends of the side edge positioning rods through the lower pressing rod and the lower pressing wheel, the upper ends of the side edge positioning rods which are arranged in a crossed mode are folded and rotate, and the base plate is pushed to the position under the printing base body. A first forward and reverse motor is started, two tooth rollers are driven to rotate reversely through transmission connection of a first connecting gear, a connecting chain and a second connecting gear, a wedge-shaped correction plate is driven to move downwards by moving a tooth plate, a base plate slightly moves front and back, the front-back position of the base plate is adjusted, and therefore the effect of precise positioning is achieved, and follow-up precise printing is facilitated.

Description

Technical Field

[0001] This invention relates to the field of surface mount resistor printing technology, specifically to a device and method for precise positioning of UV printing of the first protective layer of a surface mount resistor. Background Technology

[0002] Traditional surface mount resistor production of the G1 protective layer / first protective layer, G2 protective layer / second protective layer, and MK code layer requires three independent printing machines (G1 printer, G2 printer, and MK printer) in conjunction with thermosetting equipment for segmented operations. The substrate needs to be manually handled between the machines, resulting in the following drawbacks: 1. Manual handling easily causes substrate damage and breakage, leading to high material loss; 2. The segmented production process is cumbersome, with a single batch taking over 60 minutes, resulting in extremely low production efficiency; 3. The thermosetting equipment requires continuous high-temperature baking, consuming a lot of energy, and the high-temperature volatilization of the paste causes material waste and environmental pollution; 4. The dispersed equipment layout occupies a large production space and lacks automated linkage control, resulting in high labor costs.

[0003] In our research on an automated equipment integrating the printing of G1 / first protective layer, G2 / second protective layer, and MK code layer with UV curing, we discovered that this integrated process can be achieved using UV printing. However, during UV printing, the substrate needs to be transported to the printing area via a conveyor system with positioning plates on both sides for precise substrate transport. After the substrate enters the printing area, the conveyor system pauses for a short period to allow sufficient time for UV printing before resuming operation and transporting the printed substrate to the curing area. However, when the conveyor system stops, the substrate continues to slide in the transport direction due to inertia, causing misalignment. This prevents the subsequent ejector mechanism from accurately ejecting the substrate into the printing mount. The printing system continues printing normally, resulting in wasted printing material and the continued flow of defective surface mount resistors into subsequent processes, leading to batch defects and increased material loss.

[0004] Therefore, we propose a precise positioning device and method for UV printing of the first protective layer of chip resistors to solve the problem mentioned in the background art. When the conveying system stops conveying during the UV printing process of chip resistors, the substrate will continue to slide in the conveying direction due to inertia, causing the substrate to deviate and fail to accurately enter the printing seat. This not only causes material waste but also increases the defect rate. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for precise positioning of the first protective layer of a chip resistor in UV printing, in order to solve the problem mentioned in the background art that when the conveying system stops conveying during the UV printing process of chip resistors, the substrate will continue to slide in the conveying direction due to inertia, causing the substrate to deviate and fail to accurately enter the printing seat. As a result, the printing system will not only cause material waste but also increase the rate of defective products.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a UV printing precision positioning device for the first protective layer of a chip resistor, comprising a printing mechanism, wherein the printing mechanism is internally provided with a positioning mechanism and a front and rear correction mechanism, and the positioning mechanism is internally provided with a pressure detection mechanism; The printing mechanism includes a chassis, the top of which is provided with two side plates, and the top of the two side plates is provided with a printing head system; The positioning mechanism includes a pressing component and a side positioning component. The pressing component includes a hydraulic rod, a pressing plate is fixedly installed at the top of the hydraulic rod, four connecting plates are fixedly installed at the top edge of the pressing plate, a pressing rod is fixedly installed on the top surface inside each of the four connecting plates, a movable rod is movably embedded inside each of the four pressing rods, and a pressing wheel is movably sleeved on the outer surface of each of the four movable rods. The side positioning assembly includes two central shafts, and two side positioning rods are movably sleeved on the outer surfaces of the two central shafts.

[0007] Preferably, the side positioning assembly further includes a fixing frame, wherein fixing plates are fixedly installed on the front and rear surface walls inside the fixing frame, and supporting springs are fixedly connected to the outer surfaces on both sides of the two fixing plates. Two brackets are fixedly installed on the outer surfaces on both sides of the fixing frame, and flexible sleeves are fixedly connected to the top ends of the four side positioning rods. A material ejector rod is fixedly installed on the bottom surface inside the fixing frame, and a material ejector clamp is fixedly installed on the top end of the material ejector rod.

[0008] Preferably, the front and rear correction mechanism includes a printing base body. The front and rear surfaces of the bottom of the printing base body are each provided with an embedded groove. The front and rear surfaces of the printing base body are each provided with a movable groove. A wedge-shaped correction plate is movably embedded inside each of the two embedded grooves. A movable toothed plate is fixedly installed on one outer surface of each of the two wedge-shaped correction plates. A toothed roller is meshed with the outer surface of each of the two movable toothed plates. A rotating rod is fixedly installed inside each of the two toothed rollers. A first connecting gear is fixedly installed at one end of each of the two rotating rods. A connecting chain is meshed with the outer surface of each of the two first connecting gears. A second connecting gear is movably connected inside each of the two connecting chains.

[0009] Preferably, four pressure detection mechanisms are provided, each including a T-shaped rail. An arc-shaped toothed plate is movably fitted onto the outer surface of each of the four T-shaped rails. An angle sensor is fixedly installed on the outer surface of each of the four arc-shaped toothed plates. A second forward / reverse motor is fixedly installed on the outer surface of each of the four side positioning rods. An adjusting gear is fixedly installed at the output end of each of the four second forward / reverse motors. A pressure sensor is fixedly installed at one end of two of the arc-shaped toothed plates, and a rubber rod is fixedly installed at one end of the other two arc-shaped toothed plates. The outer surfaces of the four adjusting gears mesh with the outer surfaces of the four arc-shaped toothed plates, and the outer surfaces of the four T-shaped rails are fixedly installed on the outer surfaces of the four side positioning rods.

[0010] Preferably, a conveying system body is provided on each of the two side plates opposite to each other, a curing lamp is fixedly installed on the top of the two side plates near the printing head system, a computer system is fixedly installed on the front surface of the top of the chassis, a feeding system is provided on one edge of the top of the chassis, and a discharging system is provided on the other edge of the top of the chassis.

[0011] Preferably, a mounting plate is fixedly installed at the bottom end of the hydraulic rod, and two supporting telescopic rods are fixedly installed on the bottom surface inside the mounting plate. The top ends of the two supporting telescopic rods are fixedly installed at the bottom of the lower pressure plate. A mounting hole is opened at the top of the chassis, and the top of the mounting plate is fixedly installed on the top surface inside the chassis near the mounting hole. The outer surfaces of the hydraulic rod and the two supporting telescopic rods are all located inside the mounting hole.

[0012] Preferably, the front and rear surfaces of the fixing frame are respectively mounted on opposite sides of the two side plates via auxiliary rods. The bottom of the fixing frame is located on the top of the lower pressure plate. One end of each of the two central shafts is fixedly mounted on the front and rear surface walls inside the fixing frame. One end of each of the four support springs is fixedly connected to the outer surface of the bottom of each of the four side positioning rods. The outer surfaces of each of the four lower pressure wheels are in contact with the outer surfaces of each of the four side positioning rods. The outer surfaces of each of the four side positioning rods are movably embedded inside the four brackets.

[0013] Preferably, each of the two second connecting gears has an I-shaped rod movably embedded inside. One end of each of the two I-shaped rods is fixedly installed on the outer surface of one side of the printing base body. Each of the two side plates has a fixing groove on its top and a movable groove near the fixing groove on its top. A first forward and reverse motor is fixedly installed inside one of the fixing grooves. The output end of the first forward and reverse motor is fixedly connected to the outer surface of one of the first connecting gears. The outer surfaces of the two second connecting gears are meshed together.

[0014] Preferably, limiting grooves are provided on both sides of the two inner grooves, limiting rods are fixedly installed on both outer surfaces of the two wedge-shaped correction plates, one end of each of the four limiting rods is movably embedded in the four limiting grooves, the outer surfaces of the two movable toothed plates are movably embedded in the two movable grooves and the two movable grooves, the outer surfaces of the two toothed rollers are movably embedded in the two movable grooves, one end of each of the two rotating rods movably penetrates into the two fixed grooves, the other end of each of the two rotating rods is movably embedded in the inner wall of one side of the two movable grooves, and the bottom of the printing base body is fixedly installed on the top of the two side plates.

[0015] A method for precise positioning of a UV-printed first protective layer of a chip resistor includes the following steps: S1. Select the raw materials required for the substrate in advance, stir the raw materials, centrifuge the stirred raw materials to obtain printing paste, and then pass the paste into the printing head of the printing head system. S2. The feeding system places the substrate on the conveying system body and intermittently conveys it to the bottom of the printing head system. Then, the hydraulic rod is activated, which pulls the lower pressure plate, connecting plate and lower pressure rod downward, so that the lower pressure roller generates a downward thrust on the bottom end of the side positioning rod. At this time, the upper ends of the crossed side positioning rods close together, pushing the substrate to the bottom of the printing seat body. S3. When the side positioning rod rotates, it drives the two opposite arc-shaped toothed plates to rotate together. When the rubber rod contacts the pressure sensor, the pressure sensor sends the pressure signal to the control system. When the pressure data matches the set data, the control system controls the hydraulic rod to stop working and stops the downward pressing movement of the lower platen. S4. Start the first forward and reverse motor. Through the connection of the first connecting gear, the connecting chain and the second connecting gear, drive the two rotating rods to drive the two toothed rollers to rotate in opposite directions, thereby driving the moving toothed plate and the wedge-shaped correction plate to move downward and adjust the front and rear positions of the base plate. S5. Next, the top material electric push rod is started, and the top material clamping plate pushes the substrate from the conveying system body into the printing seat body. At this time, the hydraulic rod pushes the lower pressure plate to move upward and reset. S6. The printing head system starts and prints the substrate in the printing base body. After printing, the top material push rod drives the substrate to move downward and fall onto the conveying system body. Then the conveying system body resumes operation and continues to convey the substrate to the curing lamp for UV curing. Finally, the substrate is unloaded through the unloading system.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In use, the hydraulic rod pulls the lower pressure plate downwards, generating a downward thrust on the bottom of the side positioning rods through the lower pressure rod and lower pressure wheel. This causes the upper ends of the cross-shaped side positioning rods to close and rotate, pushing the substrate directly below the printing base body. The first forward and reverse motor is then activated, driving the two toothed rollers to rotate in opposite directions via the transmission connection of the first connecting gear, connecting chain, and second connecting gear. This, in turn, moves the wedge-shaped correction plate downwards by moving the toothed plate, causing the substrate to move slightly back and forth. This adjusts the substrate's position, achieving precise positioning and facilitating accurate subsequent printing.

[0017] 2. When the cross side positioning rods of this invention are in use, they rotate and close together, causing the corresponding arc-shaped toothed plates to rotate relative to each other. This, in turn, causes the pressure sensor and the rubber rod to rotate relative to each other. When the rubber rod comes into contact with the pressure sensor, it will generate pressure on it. The pressure sensor will transmit the detected pressure signal to the control system for identification and analysis. When the pressure data matches the set data, the control system will control the hydraulic rod to stop working and stop the downward pressing movement of the lower platen. This prevents the cross side positioning rods from closing too much, which would cause excessive pressure on the substrate and damage the substrate.

[0018] 3. In use, the second forward and reverse motor is activated, driving the adjusting gear to rotate. This causes the arc-shaped toothed plate to rotate on the outer surface of the T-shaped rail, resulting in relative movement between the rubber rod and the pressure sensor, reducing the distance between them. Simultaneously, the angle sensor detects the rotation angle. When the rotation angle of the arc-shaped toothed plate matches the set data, the control system stops the second forward and reverse motor. The pressure detection mechanism allows adjustment of the distance between the rubber rod and the pressure sensor, thus adapting to the positioning of substrates of different widths, making it more flexible and applicable. Attached Figure Description

[0019] Figure 1 This is a front perspective view of a UV-printed precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 2 This is a cross-sectional view of the side plate in a UV-printed precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 3 This is a schematic diagram of the front and rear correction mechanism in a UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 4 This is a cross-sectional view of the printing base body in a UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 5 This is a schematic diagram showing the unfolded structure of the wedge-shaped correction plate in the UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 6 This is a cross-sectional view of the limiting groove in a UV-printed precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 7 This is a schematic diagram of the positioning mechanism in a UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 8 This is a schematic diagram of the side positioning component in a UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 9 This is a schematic diagram of the pressure detection mechanism in a UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 10 This is a schematic diagram showing the unfolded structure of the central axis in a UV-printed precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 11 This is another schematic diagram of the side positioning component in the UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention. Figure 12 This is a schematic diagram showing the unfolded structure of the arc-shaped toothed plate in the UV printing precision positioning device for the first protective layer of a chip resistor according to the present invention.

[0020] In the picture: 1. Printing Mechanism; 101. Chassis; 102. Side Plate; 103. Conveying System Body; 104. Printing Head System; 105. Curing Lamp; 106. Computer System; 107. Feeding System; 108. Unloading System; 109. Mounting Hole; 110. Fixed Slot; 111. Movable Slot; 112. Top Material Electric Push Rod; 113. Top Material Clamping Plate; 2. Positioning Mechanism; 21. Pressing Assembly; 2101. Mounting Plate; 2102. Hydraulic Rod; 2103. Support Telescopic Rod; 2104. Pressing Plate; 2105. Connecting Plate; 2106. Pressing Rod; 2107. Movable Rod; 2108. Pressing Roller; 22. Side Positioning Assembly; 2201. Fixed Frame; 2202. Bracket; 2203. Central Shaft; 2204. Side positioning rod; 2205. Flexible sleeve; 2206. Fixing plate; 2207. Support spring; 3. Pressure detection mechanism; 301. T-shaped rail; 302. Arc-shaped toothed plate; 303. Second forward and reverse motor; 304. Adjusting gear; 305. Angle sensor; 306. Pressure sensor; 307. Rubber rod; 4. Front and rear correction mechanism; 401. Printing seat body; 402. Embedded groove; 403. Moving groove; 404. Limiting groove; 405. Wedge-shaped correction plate; 406. Moving toothed plate; 407. Toothed roller; 408. Rotating rod; 409. First connecting gear; 410. First forward and reverse motor; 411. Limiting rod; 412. Connecting chain; 413. Second connecting gear; 414. I-shaped rod. Detailed Implementation

[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1-12As shown, the present invention provides a technical solution: a precise positioning device for UV printing of the first protective layer of a chip resistor, comprising a printing mechanism 1, wherein a positioning mechanism 2 and a front and rear correction mechanism 4 are disposed inside the printing mechanism 1, and a pressure detection mechanism 3 is disposed inside the positioning mechanism 2; the printing mechanism 1 includes a housing 101, the top of the housing 101 is provided with two side plates 102, and the top of the two side plates 102 is provided with a printing head system 104; the positioning mechanism 2 includes a pressing component 21 and a side positioning component 22, the pressing component 21 including a hydraulic rod 2102. A lower pressure plate 2104 is fixedly installed at the top of the hydraulic rod 2102. Four connecting plates 2105 are fixedly installed at the top edge of the lower pressure plate 2104. A lower pressure rod 2106 is fixedly installed on the top surface inside each of the four connecting plates 2105. A movable rod 2107 is movably embedded inside each of the four lower pressure rods 2106. A lower pressure wheel 2108 is movably sleeved on the outer surface of each of the four movable rods 2107. The side positioning assembly 22 includes two central shafts 2203. Two side positioning rods 2204 are movably sleeved on the outer surface of the two central shafts 2203. The side positioning assembly 22 also includes a fixing frame 2201. Fixing plates 2206 are fixedly installed on the front and rear surface walls inside the fixing frame 2201. Support springs 2207 are fixedly connected to the outer surfaces on both sides of the two fixing plates 2206. Two brackets 2202 are fixedly installed on the outer surfaces on both sides of the fixing frame 2201. Flexible sleeves 2205 are fixedly connected to the top of the four side positioning rods 2204. A top material push rod 112 is fixedly installed on the bottom surface inside the fixing frame 2201. A top material clamping plate 113 is fixedly installed on the top of the top material push rod 112. Each of the two side plates 102 has a conveyor system body 103 on one side facing each other. A curing lamp 105 is fixedly installed on the top of the two side plates 102 near the printing head system 104. A computer system 106 is fixedly installed on the front surface of the top of the chassis 101. A feeding system 107 is provided on one edge of the top of the chassis 101, and a discharging system 108 is provided on the other edge of the top of the chassis 101. A mounting plate 2101 is fixedly installed at the bottom of the hydraulic rod 2102. Two support telescopic rods 2103 are fixedly installed on the bottom surface inside the mounting plate 2101. The tops of the two support telescopic rods 2103 are fixedly installed on the bottom of the lower pressure plate 2104. A mounting hole 109 is provided on the top of the chassis 101. The top of the mounting plate 2101 is fixedly installed on the top surface inside the chassis 101 near the mounting hole 109. The outer surfaces of the hydraulic rod 2102 and the two support telescopic rods 2103 are all located inside the mounting hole 109.The front and rear surfaces of the fixing frame 2201 are respectively mounted on opposite sides of the two side plates 102 via auxiliary rods. The bottom of the fixing frame 2201 is located on the top of the lower pressure plate 2104. One end of the two central shafts 2203 are respectively fixedly mounted on the front and rear surface walls inside the fixing frame 2201. One end of the four support springs 2207 is respectively fixedly connected to the outer surface of the bottom of the four side positioning rods 2204. The outer surfaces of the four lower pressure wheels 2108 are respectively in contact with the outer surfaces of the four side positioning rods 2204. The outer surfaces of the four side positioning rods 2204 are respectively movably embedded inside the four brackets 2202.

[0023] In this embodiment, the raw materials required for the substrate are selected in advance and stirred. The stirred raw materials are then centrifuged to obtain a printing paste, which is then fed into the printing head of the printing head system 104. The substrate is placed onto the conveying system body 103 by the feeding system 107, and the substrate is intermittently conveyed by the conveying system body 103. When the substrate is conveyed to the bottom of the printing head system 104, the conveying system body 103 stops conveying. Next, the hydraulic rod 2102 is activated, pulling the lower pressure plate 2104 downward. This, in turn, drives the lower pressure rod 2106 downward via the connecting plate 2105. Simultaneously, the lower pressure roller 2108 moves downward on the outer surface of the side positioning rod 2204, generating a downward thrust on the bottom end of the side positioning rod 2204. This causes the side positioning rod 2204 to rotate around the central axis 2203, with its lower end rotating towards the fixed plate 2206 and compressing the support spring 2207. Its upper end rotates towards the side of the substrate, then contacts the side of the substrate. As the side positioning rod 2204 continues to rotate, it generates a thrust on the substrate, causing it to move slightly. The four side positioning rods 2204 are arranged in pairs, with the two side positioning rods 2204 in each pair arranged in a cross configuration. Figure 8As shown, two sets of intersecting side positioning rods 2204 simultaneously rotate towards the center of the printing head, thereby moving the substrate, which has shifted due to inertia, to directly below the printing base body 401. During the closing and rotation of the side positioning rods 2204, pressure is detected by the pressure detection mechanism 3 to prevent the side positioning rods 2204 from excessively clamping the substrate and causing damage. Under the action of the positioning mechanism 2, the substrate is slightly adjusted from both ends by the two sets of intersecting side positioning rods 2204, thereby achieving a precise positioning effect. This ensures that the lateral position of the substrate is accurately located below the printing base body 401, facilitating subsequent precise printing. This solves the problem that during the UV printing of surface mount resistors, when the conveying system stops, the substrate will continue to slide in the conveying direction due to inertia, causing the substrate to shift and fail to accurately enter the printing base. This not only results in material waste but also increases the defect rate. Next, the front and rear correction mechanism 4 is activated to adjust the front and rear position of the substrate, ensuring its vertical position is precisely below the printing press body 401. Then, the top material pusher 112 is activated, pushing the top material clamping plate 113 upwards, placing the positioned substrate within it. As the top material clamping plate 113 moves upwards, it pushes the substrate off the conveying system body 103 and into the printing press body 401. Next, the hydraulic rod 2102 pushes the lower pressure plate 2104 upwards, which, through the connecting plate 2105, drives the lower pressure rod 2106 and lower pressure roller 2108 upwards, gradually reducing the pressure on the side positioning rod 2204. Under the rebound of the support spring 2207, the side positioning rod 2204 rotates in the opposite direction, expanding from a closed position and falling into the bracket 2202. Simultaneously, the printing head system 104 is activated to print on the substrate in the printing press body 401. Next, the top material push rod 112 moves downward to reset, and the substrate falls back onto the conveying system body 103. Then, the front and rear correction mechanism 4 is activated again to reset, and the conveying system body 103 resumes operation and continues to convey the substrate to the curing lamp 105 for UV curing. The cured resistor patch is then conveyed to the unloading system 108 for unloading.

[0024] Example 2: Figures 3-6As shown, the printing mechanism 1 is internally equipped with a positioning mechanism 2 and a front-to-back correction mechanism 4. The positioning mechanism 2 is internally equipped with a pressure detection mechanism 3. The front-to-back correction mechanism 4 includes a printing base body 401. The front and rear surfaces of the bottom of the printing base body 401 are provided with embedded grooves 402. The front and rear surfaces of the printing base body 401 are provided with moving grooves 403. Wedge-shaped correction plates 405 are movably embedded inside the two embedded grooves 402. Moving toothed plates 406 are fixedly installed on one outer surface of the two wedge correction plates 405. Toothed rollers 407 are meshed and connected to the outer surfaces of the two moving toothed plates 406. Rotating rods 408 are fixedly installed inside the two toothed rollers 407. First connecting gears 409 are fixedly installed at one end of the two rotating rods 408. Connecting chains 412 are meshed and connected to the outer surfaces of the two first connecting gears 409. Second connecting gears 413 are movably connected inside the two connecting chains 412. Both second connecting gears 413 have I-shaped rods 414 movably embedded inside them. One end of each I-shaped rod 414 is fixedly installed on one side of the outer surface of the printing base body 401. The top of each side plate 102 has a fixing groove 110. The top of each side plate 102 near the fixing groove 110 has a movable groove 111. A first forward and reverse motor 410 is fixedly installed inside one of the fixing grooves 110. The output end of the first forward and reverse motor 410 is fixedly connected to the outer surface of one of the first connecting gears 409. The outer surfaces of the two second connecting gears 413 are meshed together. Limiting grooves 404 are provided on both sides of the two inner grooves 402. Limiting rods 411 are fixedly installed on both outer surfaces of the two wedge-shaped correction plates 405. One end of the four limiting rods 411 is movably embedded in the four limiting grooves 404. The outer surfaces of the two movable toothed plates 406 are movably embedded in the two movable grooves 403 and the two movable grooves 111. The outer surfaces of the two toothed rollers 407 are movably embedded in the two movable grooves 111. One end of the two rotating rods 408 is movably inserted into the two fixed grooves 110. The other end of the two rotating rods 408 is movably embedded in the inner wall of one side of the two movable grooves 111. The bottom of the printing base body 401 is fixedly installed on the top of the two side plates 102.

[0025] In this embodiment, during use, after the left and right positions of the substrate are adjusted by the positioning mechanism 2, the first forward and reverse motor 410 is started, driving the first connecting gear 409 and the connecting chain 412 connected to it to rotate, and driving one of the second connecting gears 413 to rotate in the same direction at the same time, while driving the other second connecting gear 413, the connecting chain 412 and the first connecting gear 409 to rotate in opposite directions, so that the two rotating rods 408 rotate in opposite directions. Through the two counter-rotating toothed rollers 407, the two moving toothed plates 406 are driven to move downward, thereby driving the two wedge-shaped correction plates 405 to move downward along the side of the side plate 102. The bottom of the wedge gradually enters the space between the substrate and the side plate 102. When the front and back positions of the substrate are not offset, the wedge bottom of the wedge-shaped correction plate 405 will not contact the substrate and will not exert a pushing force on it. When the substrate is offset in the front and back, the substrate will contact the wedge bottom of the wedge-shaped correction plate 405 and be pushed by the wedge surface, causing the substrate to move slightly in the front and back, thereby adjusting the front and back positions of the substrate, and thus making the positioning of the substrate more accurate.

[0026] Example 3: Figures 7-12 As shown, the printing mechanism 1 is internally equipped with a positioning mechanism 2 and a front-to-back correction mechanism 4. The positioning mechanism 2 is internally equipped with a pressure detection mechanism 3. There are four pressure detection mechanisms 3, each of which includes a T-shaped rail 301. The outer surface of each of the four T-shaped rails 301 is movably fitted with an arc-shaped toothed plate 302. An angle sensor 305 is fixedly installed on the outer surface of each of the four arc-shaped toothed plates 302. The outer surface of each of the four side positioning rods 2204 is fixedly installed with a second forward and reverse motor 303. The output end of each of the four second forward and reverse motors 303 is fixedly installed with an adjusting gear 304. One end of each of the two arc-shaped toothed plates 302 is fixedly installed with a pressure sensor 306, and one end of each of the other two arc-shaped toothed plates 302 is fixedly installed with a rubber rod 307. The outer surfaces of the four adjusting gears 304 are respectively meshed with the outer surfaces of the four arc-shaped toothed plates 302. The outer surfaces of the four T-shaped rails 301 are respectively fixedly installed on the outer surfaces of the four side positioning rods 2204.

[0027] In this embodiment, during use, when the crossed side positioning rods 2204 close and rotate, they will drive the corresponding pressure detection mechanism 3 to rotate relative to each other. Based on the width of the substrate, the pressure data of the pressure sensor 306 and rubber rod 307 when the side positioning rods 2204 contact the side of the substrate is pre-set in the external control system. When the two opposing arc-shaped toothed plates 302 rotate relative to each other, they push the pressure sensor 306 and rubber rod 307 to rotate relative to each other. When the rubber rod 307 contacts the pressure sensor 306, it generates pressure. The pressure sensor 306 transmits the detected pressure signal to the control system via an electrical signal for identification and analysis. When the pressure data matches the set data, the control system controls the hydraulic rod 2102 to stop working, stopping the downward movement of the lower pressure plate 2104, thus preventing the crossed side positioning rods 2204 from closing excessively, causing excessive pressure on the substrate and resulting in damage.

[0028] Furthermore, based on the width of the substrate, the rotation angle data of the angle sensor 305 is pre-set in the control system. The second forward / reverse motor 303 is started, driving the adjusting gear 304 to rotate, causing the arc-shaped toothed plate 302 to rotate on the outer surface of the T-rail 301 (both adjacent arc-shaped toothed plates 302 rotate relative to each other around the central axis 2203). This causes the rubber rod 307 and the pressure sensor 306 to move relative to each other, reducing the distance between them (the smaller the substrate width, the smaller the closing angle of the side positioning rod 2204, and the larger the distance between the rubber rod 307 and the pressure sensor 306 needs to be; the larger the substrate width, the larger the closing angle of the side positioning rod 2204, and the smaller the distance between the rubber rod 307 and the pressure sensor 306 needs to be). When the arc-shaped toothed plate 302 rotates, the rotation angle of the arc-shaped toothed plate 302 is detected by the angle sensor 305. When the rotation angle of the arc-shaped toothed plate 302 matches the set data, the control system controls the second forward / reverse motor 303 to stop working. The distance between the rubber rod 307 and the pressure sensor 306 can be adjusted by the pressure detection mechanism 3, thereby adapting to the positioning of substrates of different widths and making it more flexible and applicable.

[0029] The method of use and working principle of this invention are as follows: In use, the raw materials required for the substrate are selected in advance and stirred. The stirred raw materials are then centrifuged to obtain a printing paste, which is then fed into the printing head of the printing head system 104. The substrate is placed onto the conveying system body 103 via the feeding system 107, and the substrate is intermittently conveyed by the conveying system body 103. When the substrate is conveyed to below the printing head system 104, the conveying system body 103 stops conveying. Next, the hydraulic rod 2102 is activated, pulling the lower pressure plate 2104 downward. Through the connecting plate 2105, the lower pressure rod 2106 is moved downward. At the same time, the lower pressure roller 2108 moves downward on the outer surface of the side positioning rod 2204, generating a downward thrust on the bottom end of the side positioning rod 2204. This causes the side positioning rod 2204 to rotate around the central axis 2203. Its lower end rotates towards the fixed plate 2206 and squeezes the support spring 2207. Its upper end rotates towards the side of the substrate and then contacts the side of the substrate, moving the substrate, which has shifted due to inertial sliding, to directly below the printing base body 401. When the side positioning rod 2204 rotates, it will drive the corresponding pressure detection mechanism 3 to rotate. Through the two arc-shaped toothed plates 302, the pressure sensor 306 and the rubber rod 307 will rotate relative to each other. When the rubber rod 307 contacts the pressure sensor 306, it will generate pressure on it. The pressure sensor 306 will send the detected pressure signal to the control system for identification and analysis. When the pressure data matches the set data, the control system will control the hydraulic rod 2102 to stop working and stop the downward movement of the lower pressure plate 2104. Next, the first forward and reverse motor 410 is started, driving the first connecting gear 409, connecting chain 412, and second connecting gear 413 to rotate simultaneously in the same direction. Simultaneously, this drives the other second connecting gear 413, connecting chain 412, and first connecting gear 409 to rotate in opposite directions. The two rotating rods 408 drive the two toothed rollers 407 to rotate, driving the two moving toothed plates 406 to move downwards, which in turn drives the two wedge-shaped correction plates 405 to move downwards. The substrate contacts the wedge-shaped bottom of the wedge-shaped correction plate 405 and is pushed by the wedge-shaped surface, causing the substrate to move slightly back and forth, thereby adjusting the substrate's front-to-back position. Then, the ejector electric push rod 112 is started, pushing the ejector clamp 113 upwards, lifting the substrate from the conveying system body 103, and then pushing it into the printing base body 401. Next, the hydraulic rod 2102 pushes the lower pressure plate 2104 upward, and the pressure on the side positioning rod 2204 gradually decreases. Under the rebound of the support spring 2207, the side positioning rod 2204 is pushed to rotate in the opposite direction and fall into the bracket 2202. At the same time, the printing head system 104 is started to print on the substrate in the printing seat body 401.Next, the top material push rod 112 moves downward to reset, and the substrate falls back onto the conveying system body 103. Then, the front and rear correction mechanism 4 is activated again to reset, and the conveying system body 103 resumes operation and continues to convey the substrate to the curing lamp 105 for UV curing. The cured resistor patch is then conveyed to the unloading system 108 for unloading.

[0030] Among them, the conveying system body 103, printing head system 104, curing lamp 105, computer system 106, feeding system 107, unloading system 108, top material electric push rod 112, hydraulic rod 2102, second forward and reverse motor 303, angle sensor 305, pressure sensor 306 and first forward and reverse motor 410 are all existing technologies, and their components and operating principles are all publicly available technologies, and will not be explained in detail here.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A UV printing precision positioning device for the first protective layer of a surface mount resistor, comprising a printing mechanism (1), characterized in that: The printing mechanism (1) is equipped with a positioning mechanism (2) and a front and rear correction mechanism (4), and the positioning mechanism (2) is equipped with a pressure detection mechanism (3). The printing mechanism (1) includes a housing (101), the top of which is provided with two side plates (102), and the top of the two side plates (102) is provided with a printing head system (104). The positioning mechanism (2) includes a pressing component (21) and a side positioning component (22). The pressing component (21) includes a hydraulic rod (2102). A pressing plate (2104) is fixedly installed at the top of the hydraulic rod (2102). Four connecting plates (2105) are fixedly installed at the top edge of the pressing plate (2104). A pressing rod (2106) is fixedly installed on the top surface inside each of the four connecting plates (2105). A movable rod (2107) is movably embedded inside each of the four pressing rods (2106). A pressing wheel (2108) is movably sleeved on the outer surface of each of the four movable rods (2107). The side positioning assembly (22) includes two central shafts (2203), and two side positioning rods (2204) are movably sleeved on the outer surfaces of the two central shafts (2203).

2. The UV printing precision positioning device for the first protective layer of the surface mount resistor according to claim 1, characterized in that: The side positioning assembly (22) also includes a fixing frame (2201). The front and rear surfaces of the fixing frame (2201) are fixedly mounted with fixing plates (2206). Support springs (2207) are fixedly connected to the outer surfaces on both sides of the two fixing plates (2206). Two brackets (2202) are fixedly mounted on the outer surfaces on both sides of the fixing frame (2201). Flexible sleeves (2205) are fixedly connected to the top of the four side positioning rods (2204). A top material push rod (112) is fixedly mounted on the bottom surface inside the fixing frame (2201). A top material clamping plate (113) is fixedly mounted on the top of the top material push rod (112).

3. The UV printing precision positioning device for the first protective layer of the surface mount resistor according to claim 2, characterized in that: The front and rear correction mechanism (4) includes a printing base body (401). The printing base body (401) has an inset groove (402) on the front and rear surfaces of its bottom. The printing base body (401) also has a moving groove (403) on the front and rear surfaces. A wedge-shaped correction plate (405) is movably embedded in the two inset grooves (402). A moving toothed plate (406) is fixedly installed on one outer surface of each of the two wedge-shaped correction plates (405). A toothed roller (407) is meshed with the outer surface of each of the two moving toothed plates (406). A rotating rod (408) is fixedly installed inside each of the two toothed rollers (407). A first connecting gear (409) is fixedly installed at one end of each of the two rotating rods (408). A connecting chain (412) is meshed with the outer surface of each of the two first connecting gears (409). A second connecting gear (413) is movably connected inside each of the two connecting chains (412).

4. The UV printing precision positioning device for the first protective layer of the chip resistor according to claim 3, characterized in that: The pressure detection mechanism (3) is provided in four parts. Each of the four pressure detection mechanisms (3) includes a T-shaped rail (301). The outer surface of each of the four T-shaped rails (301) is movably fitted with an arc-shaped toothed plate (302). An angle sensor (305) is fixedly installed on the outer surface of each of the four arc-shaped toothed plates (302). A second forward and reverse motor (303) is fixedly installed on the outer surface of each of the four side positioning rods (2204). An adjusting gear (304) is fixedly installed at the output end of each of the four second forward and reverse motors (303). A pressure sensor (306) is fixedly installed at one end of each of the two arc-shaped toothed plates (302). A rubber rod (307) is fixedly installed at one end of each of the other two arc-shaped toothed plates (302). The outer surface of each of the four adjusting gears (304) meshes with the outer surface of each of the four arc-shaped toothed plates (302). The outer surface of each of the four T-shaped rails (301) is fixedly installed on the outer surface of each of the four side positioning rods (2204).

5. The UV printing precision positioning device for the first protective layer of the chip resistor according to claim 4, characterized in that: A conveying system body (103) is provided on each of the two side plates (102) opposite to each other. A curing lamp (105) is fixedly installed on the top of the two side plates (102) near the printing head system (104). A computer system (106) is fixedly installed on the front surface of the top of the chassis (101). A feeding system (107) is provided on one edge of the top of the chassis (101), and a discharging system (108) is provided on the other edge of the top of the chassis (101).

6. The UV printing precision positioning device for the first protective layer of the surface mount resistor according to claim 5, characterized in that: The bottom end of the hydraulic rod (2102) is fixedly installed with a mounting plate (2101). Two support telescopic rods (2103) are fixedly installed on the bottom surface inside the mounting plate (2101). The top ends of the two support telescopic rods (2103) are fixedly installed on the bottom of the lower pressure plate (2104). The top of the housing (101) is provided with a mounting hole (109). The top of the mounting plate (2101) is fixedly installed on the top surface inside the housing (101) near the mounting hole (109). The outer surfaces of the hydraulic rod (2102) and the two support telescopic rods (2103) are all located inside the mounting hole (109).

7. The UV printing precision positioning device for the first protective layer of the chip resistor according to claim 6, characterized in that: The front and rear surfaces of the fixing frame (2201) are respectively mounted on opposite sides of the two side plates (102) via auxiliary rods. The bottom of the fixing frame (2201) is located on the top of the lower pressure plate (2104). One end of the two central shafts (2203) is respectively fixedly mounted on the front and rear surface walls inside the fixing frame (2201). One end of the four support springs (2207) is respectively fixedly connected to the outer surface of the bottom end of the four side positioning rods (2204). The outer surfaces of the four lower pressure wheels (2108) are respectively in contact with the outer surfaces of the four side positioning rods (2204). The outer surfaces of the four side positioning rods (2204) are respectively movably embedded in the interior of the four brackets (2202).

8. The UV printing precision positioning device for the first protective layer of the surface mount resistor according to claim 7, characterized in that: Both of the second connecting gears (413) have I-shaped rods (414) movably embedded inside them. One end of each of the two I-shaped rods (414) is fixedly installed on the outer surface of one side of the printing base body (401). The top of each of the two side plates (102) has a fixed groove (110). The top of each of the two side plates (102) has a movable groove (111) near the fixed groove (110). A first forward and reverse motor (410) is fixedly installed inside one of the fixed grooves (110). The output end of the first forward and reverse motor (410) is fixedly connected to the outer surface of one of the first connecting gears (409). The outer surfaces of the two second connecting gears (413) are meshed together.

9. The UV printing precision positioning device for the first protective layer of a surface mount resistor according to claim 8, characterized in that: Limiting grooves (404) are provided on both sides of the two inner grooves (402). Limiting rods (411) are fixedly installed on both outer surfaces of the two wedge-shaped correction plates (405). One end of each of the four limiting rods (411) is movably embedded in the four limiting grooves (404). The outer surfaces of the two movable toothed plates (406) are movably embedded in the two movable grooves (403) and the two movable grooves (111). The outer surfaces of the two toothed rollers (407) are movably embedded in the two movable grooves (111). One end of each of the two rotating rods (408) is movably inserted into the two fixed grooves (110). The other end of each of the two rotating rods (408) is movably embedded in the inner wall of one side of the two movable grooves (111). The bottom of the printing seat body (401) is fixedly installed on the top of the two side plates (102).

10. A method for precise positioning of a UV-printed first protective layer of a surface mount resistor, characterized in that, The device for precise positioning of the first protective layer of the chip resistor using UV printing as described in claim 9 includes the following steps: S1. Select the raw materials required for the substrate in advance, stir the raw materials, centrifuge the stirred raw materials to obtain printing paste, and then pass the paste into the printing head of the printing head system (104). S2. The feeding system (107) places the substrate on the conveying system body (103) and intermittently conveys it to the bottom of the printing head system (104). Then, the hydraulic rod (2102) is activated, which pulls the lower pressure plate (2104), the connecting plate (2105) and the lower pressure rod (2106) to move downward, so that the lower pressure roller (2108) generates a downward thrust on the bottom end of the side positioning rod (2204). At this time, the upper ends of the crossed side positioning rods (2204) close together, pushing the substrate to the bottom of the printing seat body (401). S3. When the side positioning rod (2204) rotates, it drives the two opposing arc-shaped toothed plates (302) to rotate together. When the rubber rod (307) contacts the pressure sensor (306), the pressure sensor (306) sends the pressure signal to the control system. When the pressure data matches the set data, the control system controls the hydraulic rod (2102) to stop working and stops the downward movement of the lower pressure plate (2104). S4. Start the first forward and reverse motor (410). Through the connection of the first connecting gear (409), the connecting chain (412), and the second connecting gear (413), drive the two rotating rods (408) to drive the two toothed rollers (407) to rotate in opposite directions, thereby driving the moving toothed plate (406) and the wedge-shaped correction plate (405) to move downwards and adjust the front and rear positions of the base plate. S5. Then the top material electric push rod (112) is started, and the top material clamping plate (113) pushes the substrate from the conveying system body (103) into the printing seat body (401). At this time, the hydraulic rod (2102) pushes the lower pressure plate (2104) to move upward and reset. S6. The printing head system (104) is started to print on the substrate in the printing seat body (401). After printing, the top material electric push rod (112) drives the substrate to move downward and fall onto the conveying system body (103). Then the conveying system body (103) resumes operation and continues to convey the substrate to the curing lamp (105) for UV curing. Finally, the substrate is unloaded through the unloading system (108).

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