A raw material conveying device for circuit board processing

Abstract

This utility model relates to the technical field of circuit board processing equipment, specifically a raw material conveying device for circuit board processing. The conveyor table has two fixed boxes symmetrically arranged on the left and right sides at its upper end, and two side plates symmetrically arranged front and rear. Two positioning seats are symmetrically arranged at both ends of the inner side of the side plates. Two pulleys are symmetrically arranged on both sides of the fixed boxes. The two symmetrical pulleys are connected by a conveyor belt. A positioning shaft and a positioning rod are fixedly arranged at the center of the pulleys. The positioning rod is inserted into the slot and slidably connected to the drive rod. This structure overturns the traditional fixed track conveying mode. Through a second motor driving a threaded rod and a positive and negative tooth structure, the spacing between the side plates is automatically adjusted. Whether it's a micro mobile phone circuit board or a large computer motherboard, it can be quickly adapted by moving the side plates without stopping the machine to disassemble the track components, significantly improving the flexibility of the production line and meeting the needs of mixed-line production of circuit boards of various specifications.

Description

Technical Field

[0001] This utility model relates to the field of circuit board processing equipment technology, specifically to a raw material conveying device for circuit board processing. Background Technology

[0002] In the circuit board manufacturing industry, material conveying devices are a crucial link connecting various processes in the production line. Traditional circuit board material conveying devices typically employ a fixed-width track structure, which can only accommodate circuit boards of a single specification or with a narrow size range (such as those only suitable for specific types like mobile phone boards or computer motherboards). However, with the diversification of electronic devices, the size specifications of circuit boards (from the miniaturized design of mobile phone boards to the large-scale layout of computer motherboards) exhibit significant differences. Manufacturers often need to process multiple specifications of circuit boards on the same equipment to meet market demands.

[0003] Existing fixed-width track conveyor systems have significant technical bottlenecks: when switching between circuit boards of different sizes, operators must stop the machine and manually disassemble and replace the track components to match the width of the target circuit board. This manual track-changing method is not only time-consuming and labor-intensive, but also leads to prolonged production line downtime, resulting in significant capacity losses. Utility Model Content

[0004] (a) Technical problems to be solved In view of the shortcomings of the prior art, this utility model provides a raw material conveying device for circuit board processing.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a raw material conveying device for circuit board processing, comprising a conveying table, two fixed boxes symmetrically arranged on the upper end of the conveying table, two side plates symmetrically arranged at the front and back, two positioning seats symmetrically arranged at both ends of the inner side of the side plates, two pulleys symmetrically arranged on both sides of the fixed boxes, the two symmetrical pulleys connected by a conveyor belt, a positioning shaft and a positioning rod fixedly arranged at the center of the pulleys, the outer end of the positioning shaft inserted into the positioning seat and rotatably connected to the positioning seat through a first bearing, a drive rod rotatably arranged inside the fixed box through a second bearing, the two ends of the drive rod having empty slots, the positioning rod inserted into the empty slots and slidably connected to the drive rod, two rectangular blocks symmetrically arranged on the outer wall of the positioning rod, a first motor fixedly arranged on one side of one of the fixed boxes, a driven bevel gear located inside the fixed box in the middle part of the drive rod, and a drive bevel gear meshing with the driven bevel gear at the output end of the first motor; Two positioning frames are symmetrically arranged on the front and rear sides of the conveyor table. A second motor is fixedly installed on one of the positioning frames. A base is fixedly installed in the middle part of the side plate. The output end of the second motor is provided with a rotating shaft. Two threaded rods with positive and negative tooth structures are symmetrically arranged on the rotating shaft. The two threaded rods pass through the two bases respectively and are threadedly connected to the bases. The end of the threaded rod away from the second motor is rotatably connected to the other positioning frame through a third bearing.

[0006] To improve the stability of the pulley during use, the present invention includes the following improvements: the first bearing is embedded inside the positioning seat and is interference-fitted with the positioning seat; the positioning shaft passes through the inner ring of the first bearing and is interference-fitted with the inner ring of the first bearing; and the two second bearings are respectively embedded at the front and rear ends of the fixed box and are both penetrated by the drive rod.

[0007] To improve the stability of the positioning rod during movement, the present invention features an improvement in which the rectangular block and the positioning rod are integrated into one structure, and the rectangular block is tightly fitted to the inner wall of the slot.

[0008] Furthermore, an improvement of this utility model is that the output end of the first motor is provided with a drive shaft that passes through the fixed box, and the drive bevel gear is fixed to one end of the drive shaft.

[0009] To improve the stability of the side plate during movement, the present invention includes the following improvements: multiple limiting frames are provided on the symmetrical positioning frames on the front and rear sides of the conveyor table, and two guide blocks are provided on the symmetrical base at the lower end of the side plate. The guide blocks are penetrated by guide rods and slidably connected to the guide rods.

[0010] Furthermore, an improvement of this utility model is that both the first motor and the second motor are servo motors.

[0011] (III) Beneficial Effects Compared with the prior art, the present invention provides a raw material conveying device for circuit board processing, which has the following beneficial effects: This structure overturns the traditional fixed track conveying mode. By using a second motor to drive a threaded rod and a positive and negative tooth structure, it achieves automatic adjustment of the side plate spacing. Whether it is a micro mobile phone circuit board or a large computer motherboard, it can be quickly adapted by moving the side plates without stopping the machine to disassemble the track components. This significantly improves the flexibility of the production line and meets the needs of mixed-line production of circuit boards of various specifications. Attached Figure Description

[0012] Figure 1 This is a first-view perspective three-dimensional structural diagram of the present invention; Figure 2 This is a second-view perspective three-dimensional structural diagram of the present invention; Figure 3 This utility model Figure 1A magnified schematic diagram of the local structure at point A; Figure 4 This is a schematic diagram of the meshing structure between the drive bevel gear and the driven bevel gear in this utility model. In the diagram: 1. Conveyor table; 2. Fixed box; 3. Side plate; 4. Pulley; 5. Positioning shaft; 6. Positioning seat; 7. Positioning rod; 8. Drive rod; 9. Empty slot; 10. First motor; 11. Driven bevel gear; 12. Drive shaft; 13. Drive bevel gear; 14. Positioning frame; 15. Limiting frame; 16. Second motor; 17. Rotating shaft; 18. Threaded rod; 19. Guide rod; 20. Guide block; 21. Base; 22. Conveyor belt. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figures 1-4 This utility model discloses a raw material conveying device for circuit board processing, comprising a conveying platform 1. Two fixed boxes 2 are symmetrically arranged on the upper end of the conveying platform 1, and two side plates 3 are symmetrically arranged on the front and back. Two positioning seats 6 are symmetrically arranged at both ends of the inner side of the side plates 3. Two pulleys 4 are symmetrically arranged on both sides of the fixed boxes 2. The two symmetrical pulleys 4 are connected by a conveying belt 22. A positioning shaft 5 and a positioning rod 7 are fixedly arranged at the center of the pulleys 4. The outer end of the positioning shaft 5 is inserted into the positioning seat 6 and is rotatably connected to the positioning seat 6 through a first bearing. A drive rod 8 is rotatably arranged inside the fixed box 2 through a second bearing. The two ends of the drive rod 8 are provided with slots 9. The positioning rod 7 is inserted into the slots 9 and is slidably connected to the drive rod 8. Two rectangular blocks are symmetrically arranged on the outer wall of the positioning rod 7. A first motor 10 is fixedly arranged on one side of one of the fixed boxes 2. A driven bevel gear 11 located inside the fixed box 2 is provided in the middle part of the drive rod 8. A drive bevel gear 13 that meshes with the driven bevel gear 11 is provided at the output end of the first motor 10. Two positioning frames 14 are symmetrically arranged on the front and rear sides of the conveyor table 1. A second motor 16 is fixedly installed on one of the positioning frames 14. A base 21 is fixedly installed in the middle part of the side plate 3. A rotating shaft 17 is provided at the output end of the second motor 16. Two threaded rods 18 with positive and negative tooth structures are symmetrically arranged on the rotating shaft 17. The two threaded rods 18 pass through the two bases 21 respectively and are threadedly connected to the bases 21. The end of the threaded rod 18 away from the second motor 16 is rotatably connected to the other positioning frame 14 through a third bearing.

[0015] The rectangular block and the positioning rod 7 are an integrated structure, and the rectangular block fits tightly against the inner wall of the slot 9.

[0016] Initial debugging and installation: The first bearing is embedded inside the positioning seat 6 and is interference-fitted with the positioning seat 6. The positioning shaft 5 passes through the inner ring of the first bearing and is interference-fitted with the inner ring of the first bearing. The two second bearings are respectively embedded at the front and rear ends of the fixed box 2, and are both penetrated by the drive rod 8.

[0017] Two fixed boxes 2 are symmetrically arranged at the top of the conveyor table 1, and the side plates 3 on the front and rear sides are connected to the conveyor table 1 through the base 21. The positioning seat 6 on the inner side of the side plate 3 provides support for the pulley 4, and the outer end of the positioning shaft 5 is inserted into the positioning seat 6 and rotated through the first bearing to ensure that the pulley 4 can rotate flexibly.

[0018] Inside the fixed box 2, the drive rod 8 is supported by the second bearings at both ends. The slots 9 at both ends of the drive rod 8 slide with the positioning rod 7. The rectangular block on the outer wall of the positioning rod 7 fits tightly with the inner wall of the slot 9, forming a stable sliding guide structure. The first motor 10 is fixed to the side of the fixed box 2, and its output drive shaft 12 passes through the fixed box 2. The drive bevel gear 13 meshes with the driven bevel gear 11 in the middle of the drive rod 8, completing the assembly of the power transmission chain.

[0019] The front and rear sides of the conveyor table 1 are equipped with multiple limiting frames 15 on the symmetrical positioning frames 14. The lower end of the side plate 3 is equipped with two guide blocks 20 on the symmetrical base 21. The guide blocks 20 are penetrated by the guide rods 19 and are slidably connected to the guide rods 19.

[0020] Threaded rods 18 are mounted on the positioning frames 14 at the front and rear of the conveyor table 1. The two ends of the threaded rods 18 are connected to the positioning frames 14 through the third bearings. The base 21 at the bottom of the side plate 3 is fitted on the threaded rods 18. The guide block 20 and the guide rod 19 slide together to provide guidance for the movement of the side plate 3.

[0021] Routine circuit board delivery operations: The output end of the first motor 10 is provided with a drive shaft 12 that passes through the fixed box 2, and the drive bevel gear 13 is fixed to one end of the drive shaft 12.

[0022] Start the first motor 10. The motor drives the drive bevel gear 13 to rotate through the drive shaft 12. The drive bevel gear 13 meshes with the driven bevel gear 11 and transmits power to the drive rod 8.

[0023] When the drive rod 8 rotates, the positioning rod 7 in the slots 9 at both ends rotates synchronously with the drive rod 8. The positioning rod 7 drives the pulley 4 to rotate, which in turn causes the conveyor belt 22 sleeved on the left and right pulleys 4 to start running.

[0024] The circuit board workpiece is placed on the conveyor belt 22 and moves with the belt. The two sides of the workpiece contact the inner wall of the side plate 3. The side plate 3 plays a limiting role to prevent the workpiece from shaking or deviating during the conveying process.

[0025] Side panel spacing adjustment process: When it is necessary to transport circuit boards of different widths, the second motor 16 is started. The second motor 16 drives the rotating shaft 17 to rotate, and the threaded rods 18 on the rotating shaft 17 rotate synchronously.

[0026] Since the threaded rod 18 is threadedly connected to the base 21, the positive and negative thread structure allows the two bases 21 to slide synchronously in opposite directions along the threaded rod 18, driving the side plate 3 to move inward or outward.

[0027] During the movement, the guide block 20 at the bottom of the side plate 3 slides on the guide rod 19, and the limiting frame 15 at the front and rear of the conveyor table 1 restricts the movement trajectory of the side plate 3 to ensure that the side plate 3 moves smoothly.

[0028] At the same time, the positioning seat 6 on the inner side of the side plate 3 moves with the side plate 3, the positioning shaft 5 pulls the pulley 4 to move, the positioning rod 7 extends and retracts in the slot 9 of the drive rod 8, and the rectangular block slides in the slot 9 to ensure that the transmission connection between the pulley 4 and the drive rod 8 is not interrupted until the side plate 3 is adjusted to the position that matches the width of the circuit board, thus completing the spacing adjustment.

[0029] Equipment maintenance and component fit inspection: Regularly check the interference fit between the first bearing and the positioning seat 6 and the positioning shaft 5 to ensure that the pulley 4 rotates without loosening; check the fit between the rectangular block and the inner wall of the slot 9 to prevent the positioning rod 7 from shaking; check the meshing clearance between the drive bevel gear 13 and the driven bevel gear 11 to ensure power transmission efficiency; test the smoothness of the sliding of the guide block 20 on the guide rod 19 to ensure the stability of the side plate 3 during adjustment.

[0030] The positioning shaft 5 and the positioning seat 6 are interference-fitted by the first bearing, and the drive rod 8 is supported by the second bearings at both ends of the fixed box 2. Combined with the tight fit between the rectangular block on the outer wall of the positioning rod 7 and the slot 9, a dual stabilizing structure of "bearing support + rectangular guide" is formed, ensuring that the radial runout of the pulley 4 is ≤0.1mm when it rotates, thus preventing the circuit board from shifting position due to the pulley 4 shaking during transportation. The limiting effect of the inner wall of the side plate 3 on the circuit board, together with the sliding guidance of the guide block 20 and the guide rod 19, ensures that the straightness of the workpiece transportation is ≤0.2mm, providing a precise positioning basis for subsequent processing procedures (such as drilling and welding).

[0031] Both the first motor 10 and the second motor 16 are servo motors.

[0032] Both the first motor 10 and the second motor 16 are servo motors, with a positioning accuracy of ±0.01mm. Through program control, the spacing between the side plates 3 can be precisely adjusted (e.g., 0.5mm level fine adjustment), adapting to the circuit board width tolerance requirements (e.g., ±0.3mm), avoiding workpiece jamming or conveying deviation caused by mechanical errors.

[0033] First Motor 10 Selection: Type: AC servo motor (with encoder); Core parameters: Power: 400-750W (suitable for conveying speeds of 1-5m / min); Rated speed: 500-1500rpm (adjustable to the speed of pulley 4 via a reduction mechanism); Positioning accuracy: ≤0.01mm (ensuring that the drive rod 8 and pulley 4 rotate synchronously without lag). Torque: ≥0.5N・m (meets the load requirements of driving multiple sets of pulleys 4 and circuit boards); Reasons for selection: The closed-loop control characteristics of servo motors can precisely adjust the conveying speed, avoiding positional deviation of circuit boards due to speed fluctuations during conveying, and adapting to the cycle requirements of different processing steps (such as low-speed and stable welding processes, and high-speed conveying for inspection processes).

[0034] Its high response speed (start / stop time ≤ 0.1s) can quickly respond to production line start / stop signals, reducing idling energy consumption, and is especially suitable for intermittent processing scenarios.

[0035] It has good transmission matching with the drive bevel gear 13 and the driven bevel gear 11, with a meshing clearance of ≤0.05mm, ensuring a power transmission efficiency of ≥95% and avoiding transmission errors caused by loss of rotation.

[0036] Second motor 16 selection: Type: High-precision DC servo motor (with braking function); Core parameters: Power: 200-400W (to meet the load requirements of the three-spacing side panels); Rated speed: 300-1000 rpm; Positioning accuracy: ≤0.005mm (ensuring the side panel 3 spacing adjustment error is ≤0.1mm, and the adapter circuit board has a width tolerance of ±0.3mm). Braking function: Power off self-locking (to prevent the rear side panel 3 from shifting due to external force); Reasons for selection: The high-precision positioning feature allows for one-click switching of the side panel 3 positions corresponding to different circuit board widths (such as 50mm, 100mm, 200mm, etc.) through program presets, eliminating the need for manual calibration and improving changeover efficiency by 80%.

[0037] It has excellent transmission matching with the forward and reverse threaded rod 18, and stable torque output. It can drive the side plate 3 and auxiliary components (positioning seat 6, pulley 4, etc.) to move smoothly, avoiding the circuit board shaking during the adjustment process.

[0038] The braking function ensures that the side plate 3 is locked after adjustment, and will not loosen even in the vibration environment of the production line, thus ensuring the reliability of the limit.

[0039] Pulley 4 Selection: Material: 6061-T6 aluminum alloy (hard anodized surface); Structural parameters: Diameter: 50-100mm (adapted to the length of the 22 conveyor belt to ensure proper belt tension); Trough type: V-shaped trough or flat trough (matching the 22 cross section of the conveyor belt to prevent slippage); Center hole: Interference fit with positioning shaft 5 and positioning rod 7 (tolerance H7 / k6) to ensure coaxiality ≤0.02mm Reasons for selection: Lightweight aluminum alloy material (density 2.7g / cm³) 3 This can reduce the load on the first motor by 10, while the surface hard anodizing (hardness HV≥300) improves wear resistance and has a service life of ≥20,000 hours, avoiding frequent replacements.

[0040] The high-precision machined center hole fits tightly with the positioning shaft 5 and positioning rod 7 to ensure that the radial runout of the pulley 4 is ≤0.05mm when it rotates, preventing the conveyor belt 22 from vibrating periodically due to eccentricity and protecting the edge of the circuit board from scratches.

[0041] The V-groove design increases the friction with the conveyor belt 22 (friction coefficient ≥ 0.8), and, in conjunction with belt tension adjustment, prevents slippage of the circuit board under heavy load (such as multilayer boards).

[0042] Conveyor belt 22 selection: Material: Antistatic polyurethane (PU) tape (embedded with a high-strength polyester fiber layer); Specifications: Width: 50-200mm (designed according to common circuit board widths, customizable); Thickness: 1-2mm (balancing flexibility and support strength); Surface resistivity: 10 6 -10 9Ω (Anti-static, to prevent circuit board components from being damaged by electrostatic discharge); Wear resistance: ≥500,000 cycles (based on 8 hours of operation per day, service life ≥1 year) Reasons for selection: Its anti-static properties meet electronic industry standards (ANSI / ESDS20.20), effectively releasing static electricity accumulated on the circuit board surface and protecting sensitive electronic components (such as chips and capacitors).

[0043] The polyurethane material has a smooth surface (roughness Ra≤0.8μm) and a certain degree of elasticity (Shore hardness 60-70A), which can not only avoid scratching the solder mask layer on the circuit board surface, but also fit tightly to the workpiece and prevent slippage during transportation.

[0044] The embedded polyester fiber layer enhances the tensile strength of the belt (≥20MPa), making it less prone to deformation even when carrying circuit boards for a long time, ensuring that the straightness of the conveyor is ≤0.2mm / m, and providing a stable positioning reference for subsequent processing steps.

[0045] In the description herein, it should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A raw material conveying device for circuit board processing, comprising a conveyor table (1), characterized in that: Two fixed boxes (2) are symmetrically arranged on the upper end of the conveyor table (1), and two side plates (3) are symmetrically arranged on the front and back. Two positioning seats (6) are symmetrically arranged at both ends of the inner side of the side plates (3). Two pulleys (4) are symmetrically arranged on both sides of the fixed boxes (2). The two pulleys (4) are connected by a conveyor belt (22). A positioning shaft (5) and a positioning rod (7) are fixedly arranged at the center of the pulleys (4). The outer end of the positioning shaft (5) is inserted into the positioning seat (6) and is rotatably connected to the positioning seat (6) through a first bearing. Inside the drive rod (8), a second bearing is used to rotate the drive rod (8). The two ends of the drive rod (8) are provided with slots (9). The positioning rod (7) is inserted into the slot (9) and slidably connected with the drive rod (8). Two rectangular blocks are symmetrically arranged on the outer wall of the positioning rod (7). The first motor (10) is fixedly installed on one side of the fixed box (2). The middle part of the drive rod (8) is provided with a driven bevel gear (11) located inside the fixed box (2). The output end of the first motor (10) is provided with a drive bevel gear (13) that meshes with the driven bevel gear (11). Two positioning frames (14) are symmetrically arranged on the front and rear sides of the conveyor platform (1). A second motor (16) is fixedly installed on one of the positioning frames (14). A base (21) is fixedly installed in the middle part of the side plate (3). A rotating shaft (17) is provided at the output end of the second motor (16). Two threaded rods (18) with positive and negative tooth structures are symmetrically arranged on the rotating shaft (17). The two threaded rods (18) pass through the two bases (21) respectively and are threadedly connected to the bases (21). The end of the threaded rod (18) away from the second motor (16) is rotatably connected to the other positioning frame (14) through a third bearing.

2. The raw material conveying device for circuit board processing according to claim 1, characterized in that: The first bearing is embedded inside the positioning seat (6) and is interference-fitted with the positioning seat (6). The positioning shaft (5) passes through the inner ring of the first bearing and is interference-fitted with the inner ring of the first bearing.

3. The raw material conveying device for circuit board processing according to claim 2, characterized in that: The rectangular block and the positioning rod (7) are an integrated structure, and the rectangular block is tightly fitted to the inner wall of the slot (9).

4. A raw material conveying device for circuit board processing according to claim 3, characterized in that: Two second bearings are respectively embedded at the front and rear ends of the fixed box (2), and both are penetrated by the drive rod (8).

5. A raw material conveying device for circuit board processing according to claim 4, characterized in that: The output end of the first motor (10) is provided with a drive shaft (12) that passes through the fixed box (2), and the drive bevel gear (13) is fixed at one end of the drive shaft (12).

6. A raw material conveying device for circuit board processing according to claim 5, characterized in that: The front and rear sides of the conveyor (1) are symmetrically positioned with multiple limit frames (15), and the lower end of the side plate (3) is symmetrically positioned with two guide blocks (20). The guide blocks (20) are penetrated by the guide rod (19) and are slidably connected to the guide rod (19).

7. A raw material conveying device for circuit board processing according to claim 6, characterized in that: Both the first motor (10) and the second motor (16) are servo motors.

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