Automatic feeding device of SMT chip mounter

Abstract

The application belongs to the technical field of patch machine feeding, and discloses an automatic feeding device of an SMT patch machine, which comprises multiple groups of first conveying assemblies and second conveying assemblies arranged side by side, the second conveying assemblies are arranged along the length direction of the patch machine, the first conveying assemblies are perpendicular to the second conveying assemblies and are arranged on one side of the feeding end of the second conveying assemblies, the first conveying assembly comprises a first rack, two groups of sliding plates are slidingly arranged on the first rack, a belt conveying line is arranged on the sliding plate, the sliding plate drives the belt conveying line to slide so that the belt conveying lines of the two adjacent groups of first conveying assemblies are close to or away from each other, a fixing frame is arranged on the first rack, a carrying assembly is arranged on the fixing frame, and the carrying assembly carries the carrier on the belt conveying line to the second conveying assembly.

Description

Technical Field

[0001] This utility model relates to the field of SMT pick and place machine feeding technology, and in particular to an automatic feeding device for an SMT pick and place machine. Background Technology

[0002] In the surface mount technology (SMT) production process of the electronics manufacturing industry, the SMT pick-and-place machine is the core production equipment, and its operating efficiency, degree of automation and operational stability directly affect the capacity and product quality of the entire production line.

[0003] Currently, the loading method for SMT pick-and-place machines mainly relies on manual operation of dedicated carts. Because the material consumption in the electronic component placement process is continuous, manual loading operations need to be performed frequently. This not only consumes a large amount of manpower and increases the labor intensity of operators, but also carries the risk of machine downtime due to untimely loading. When a cart runs out of material, it needs to be manually switched to a backup cart, interrupting the production process and further reducing production continuity, thus hindering the improvement of overall production efficiency. Furthermore, in existing technologies, each SMT placement machine requires a separate loading trolley, employing a "one-to-one" machine-to-trolley pairing model. In this model, operators must shuttle between multiple placement machines and their corresponding trolleys, frequently performing loading and switching operations. This not only makes the operation process cumbersome and increases the probability of human error but also leads to unreasonable allocation of human resources and hinders efficient collaboration among multiple machines. This deficiency is particularly pronounced in large-scale production scenarios, where it creates a significant bottleneck in production efficiency. Utility Model Content

[0004] To address the aforementioned problems, this invention provides an automatic feeding device for an SMT placement machine.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an automatic feeding device for an SMT pick and place machine, comprising multiple sets of first conveying components and second conveying components arranged in parallel. The conveying direction of the second conveying components is arranged along the length direction of the SMT pick and place machine and its discharge end is located at the inlet of the SMT pick and place machine. The conveying direction of the first conveying components is perpendicular to the conveying direction of the second conveying components and is arranged on one side of the inlet end of the second conveying components. The first conveying component includes a first frame, and two sets of sliding plates are slidably arranged on the first frame along its length direction. A belt conveyor line is arranged on the sliding plate. The sliding plate drives the belt conveyor line to slide so that the belt conveyor lines in adjacent sets of first conveying components move closer or further away from each other. A protective light grid is arranged between adjacent sets of first conveying components. A fixed frame is also arranged on the first frame, and a handling component is arranged on the fixed frame. The handling component is used to handle the PCB board carrier on the belt conveyor line to the second conveying component.

[0006] Furthermore, two sets of first slide rails with the same length direction are arranged at intervals on the first frame. Two first sliders are slidably arranged on the first slide rails. The bottom of the two sets of sliding plates are respectively fixedly connected to the two first sliders on the corresponding first slide rails. Two sets of first pneumatic slides are arranged between the two sets of first slide rails. A connecting seat is provided on the slide base of the first pneumatic slide. A connecting plate is provided on the sliding plate, and the connecting plate is connected to the connecting seat.

[0007] Furthermore, the belt conveyor line includes a first conveyor frame mounted on a sliding plate. Mounting rods are respectively mounted on both sides of the top of the first conveyor frame along its length. A driving roller and a driven roller are respectively mounted at both ends of the mounting rods. The driving roller and the driven roller are connected by a first synchronous belt. The two driving rollers are connected by a synchronous shaft. A synchronous pulley is mounted on the middle section of the synchronous shaft. A drive motor is mounted inside the first conveyor frame at one end of the driving roller. A drive wheel is mounted on the output shaft of the drive motor. The drive wheel and the synchronous pulley are connected by a second synchronous belt.

[0008] Furthermore, a number of lifting cylinders are arranged at intervals along the length of the first conveyor frame, and the piston rod of the lifting cylinder is upward and a lifting plate is provided at its end.

[0009] Furthermore, the fixed frame includes two gantry frames spanning the belt conveyor line. One gantry frame has a second slide rail at its top, and the other gantry frame has a second pneumatic slide table at its top. A second slider is slidably mounted on the second slide rail. The conveying assembly includes a sliding seat. The bottom ends of the sliding seat are fixedly connected to the slide table of the second pneumatic slide table and the second slider, respectively. A third pneumatic slide table is arranged along the length of the belt conveyor line on the sliding seat. A transverse sliding seat is arranged on the slide table of the third pneumatic slide table. A mounting plate with a horizontally arranged plate surface is arranged at the bottom of the transverse sliding seat. A vertically arranged lifting cylinder is arranged on the transverse sliding seat. The piston rod of the lifting cylinder passes downward through the mounting plate and has a lifting seat at its end. A rotating seat and a rotary motor for driving the rotating seat are rotatably mounted at the bottom of the lifting seat. A clamping assembly is arranged at the bottom of the rotating seat.

[0010] Furthermore, a vertical guide sleeve is provided on each side of the piston rod of the lifting cylinder on the mounting plate, and a guide rod is slidably arranged vertically inside the guide sleeve, with the lower end of the guide rod fixedly connected to the top of the lifting seat.

[0011] Furthermore, the clamping assembly includes a bidirectional synchronous clamping cylinder disposed at the bottom of the rotating seat, and clamping plates are provided at the piston rod ends on both sides of the bidirectional synchronous clamping cylinder.

[0012] Furthermore, the second conveying assembly includes a second frame, on which a second conveying frame is provided. Two sets of conveying plates are slidably arranged on the second conveying frame along the conveying direction of the second conveying assembly. A support platform is slidably arranged on the conveying plate along the conveying direction of the second conveying assembly, and the support platform is used to place a PCB board carrier.

[0013] Furthermore, the second conveyor frame includes three sets of uprights spaced apart along the width direction of the second frame. The inner sides of the uprights on both sides and the two sides of the upright in the middle are provided with third slide rails along the conveying direction of the second conveying assembly. A third slider is slidably mounted on the third slide rail. Fixed seats are provided on both sides of the bottom of the conveyor plate, and the fixed seats are fixedly connected to the corresponding third sliders. A fourth pneumatic slide is also provided on the second conveyor frame between two adjacent sets of uprights. The bottom of the fixed seat is fixedly connected to the slide of the corresponding fourth pneumatic slide.

[0014] Furthermore, two sets of fourth slide rails along the conveying direction of the second conveying assembly are arranged at intervals on the top surface of the conveying plate. A fourth slider is slidably mounted on the fourth slide rail. The bottom of the support platform is fixedly connected to the fourth slider. A fifth pneumatic slide is also provided on one side of the conveying plate. A fixing plate is provided on the slide base of the fifth pneumatic slide. A fixing block is provided on the corresponding side of the support platform. The fixing plate is connected to the fixing block.

[0015] In summary, this utility model has the following beneficial effects: In this application, through the coordinated layout of multiple sets of first conveying components and second conveying components, a series operation mode of multiple SMT placement machines is realized. By sliding the belt conveyor line driven by the sliding plate, the belt conveyor lines in two adjacent sets of first conveying components can be connected. The PCB board carrier is transported to the second conveying component by the handling component, and then transported to the feed port of the SMT placement machine by the second conveying component. In this way, the operator only needs to place the PCB board carrier on the belt conveyor line at a fixed loading position. Subsequent conveying, adjustment, gripping, transfer, and feeding can all be completed automatically without the need for full-time human supervision or frequent intervention. This completely changes the cumbersome mode of traditional production that requires personnel to be arranged next to multiple machines. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of multiple sets of parallel usage in an embodiment of this utility model; Figure 2 This is a structural schematic diagram of a single unit in use according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the first conveying component and the second conveying component according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the first frame and belt conveyor section of this utility model embodiment; Figure 5 This is a schematic diagram of the belt conveyor section of an embodiment of the present invention; Figure 6 This is a structural schematic diagram of the fixing frame and the handling component in an embodiment of this utility model; Figure 7 yes Figure 6 A magnified structural diagram of part A; Figure 8 This is a schematic diagram of the structure of the second conveying component according to an embodiment of the present invention; Figure 9 This is a structural schematic diagram of a single set of conveyor plates and a support platform according to an embodiment of this utility model.

[0017] In the diagram: 1. First conveying assembly; 2. Second conveying assembly; 3. Protective light curtain; 10. First frame; 11. First slide rail; 12. First slider; 13. First pneumatic slide table; 14. Connecting seat; 20. Sliding plate; 21. Connecting plate; 30. Belt conveyor line; 31. First conveyor frame; 32. Mounting rod; 33. Driving roller; 34. Driven roller; 35. First synchronous belt; 36. Synchronous shaft; 361. Synchronous pulley; 37. Drive motor; 371. Drive wheel; 38. Second synchronous belt; 39. Lifting cylinder; 391. Lifting plate; 40. Fixed frame; 41. Gantry frame; 42. Second slide rail; 43. Second pneumatic slide table; 44. Second slide... 50. Handling assembly; 51. Sliding seat; 52. Third pneumatic slide; 53. Transverse seat; 54. Mounting plate; 541. Guide sleeve; 542. Guide rod; 55. Lifting cylinder; 56. Lifting seat; 57. Rotating seat; 58. Rotary motor; 59. Clamping assembly; 591. Bidirectional synchronous clamping cylinder; 592. Clamping plate; 60. Second frame; 70. Second conveyor frame; 71. Stand; 72. Third slide rail; 73. Third slider; 74. Fourth pneumatic slide; 80. Conveyor plate; 81. Fixed seat; 82. Fourth slide rail; 83. Fourth slider; 84. Fifth pneumatic slide; 85. Fixed plate; 90. Bearing platform; 91. Fixed block. Detailed Implementation

[0018] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] like Figure 1-9As shown in the figure, this application discloses an automatic feeding device for an SMT pick and place machine, including multiple sets of first conveying components and second conveying components arranged in parallel. The conveying direction of the second conveying components is arranged along the length direction of the SMT pick and place machine, and its discharge end is located at the inlet of the SMT pick and place machine, ensuring that the PCB board carrier can directly enter the inside of the pick and place machine. The conveying direction of the first conveying components is perpendicular to the conveying direction of the second conveying components and is arranged on one side of the inlet end of the second conveying components. Through the coordinated cooperation of multiple sets of conveying components, an L-shaped layout of "lateral feeding - longitudinal feeding" is formed, which effectively saves space and realizes continuous and efficient feeding of PCB board carriers to the SMT pick and place machine, solving the problems of low efficiency, high labor intensity and poor safety of traditional manual feeding.

[0020] Specifically, the first conveying assembly includes a first frame, sliding plates, a belt conveyor, a fixed frame, and handling components. The first frame is welded from square steel to ensure overall structural stability. Two sets of first slide rails, aligned with the length direction, are spaced apart on the first frame. Two first sliders are slidably mounted on the first slide rails. The bottoms of the two sets of sliding plates are fixedly connected to the two first sliders on the corresponding first slide rails, allowing both sets of sliding plates to slide along the length direction of the first frame. Two sets of first pneumatic slides are positioned between the two sets of first slide rails. Connecting seats are provided on the slide bases of the first pneumatic slides, and connecting plates are provided on the sliding plates. The connecting plates are connected to the connecting seats on the corresponding first pneumatic slides, thereby driving the sliding plates to slide on the first slide rails via the first pneumatic slides.

[0021] The belt conveyor is mounted on a sliding plate. The sliding plate causes the belt conveyor to slide, bringing adjacent belt conveyor sections closer together or further apart, thus enabling the transport of PCB boards between adjacent sections. A protective light curtain is installed between adjacent sections. If an operator's limb enters the gap between the two sections, the light curtain immediately triggers a shutdown, preventing accidents and improving equipment safety.

[0022] The belt conveyor line is used for the lateral transport of PCB board carriers. It includes a first conveyor frame mounted on a sliding plate, constructed from lightweight and high-strength aluminum alloy profiles. Mounting rods are installed on both sides of the top of the first conveyor frame along its length. A drive roller and a driven roller are rotatably mounted at both ends of the mounting rods via bearing seats. The drive roller and the driven roller are connected by a first synchronous belt made of polyurethane with anti-slip textured surface to prevent slippage during carrier transport.

[0023] To ensure the synchronized operation of the two sets of first synchronous belts, the two drive rollers are connected by a synchronous shaft. A synchronous pulley is installed on the middle section of the synchronous shaft. A drive motor is installed at one end of the drive rollers inside the first conveyor frame. A drive wheel is installed on the output shaft of the drive motor, and the drive wheel and the synchronous pulley are connected by a second synchronous belt. This forms a power transmission path of "drive motor - drive wheel - second synchronous belt - synchronous pulley - synchronous shaft - drive roller - first synchronous belt". The drive motor speed is adjusted by a frequency converter to achieve uniform speed conveying of the carrier.

[0024] Several lifting cylinders are arranged at intervals along the length of the first conveyor frame. The piston rod of the lifting cylinder points upward and has a lifting plate at its end. When the PCB board carrier is conveyed to the designated position, the lifting cylinder drives the lifting plate to rise and lift the PCB board carrier away from the first synchronous belt, which facilitates the precise clamping of the transported components and avoids wear and tear on the synchronous belt during clamping.

[0025] A mounting frame is also provided on the first frame, and a transfer assembly is provided on the mounting frame. The transfer assembly is used to transfer the PCB board carrier on the belt conveyor to the second transfer assembly.

[0026] Specifically, the fixed frame includes two gantry frames spanning the belt conveyor line. The uprights of the gantry frames are made of square steel, and the crossbeams are made of I-beams to ensure load-bearing stability. One of the gantry frames is equipped with a second slide rail at the top, on which a second slider is slidably mounted. The other gantry frame is equipped with a second pneumatic slide table at the top.

[0027] The conveying assembly includes a sliding seat. The bottom ends of the sliding seat are fixedly connected to the slide of a second pneumatic slide table and a second slider, respectively. The second pneumatic slide table drives the sliding seat to slide along a second slide rail, thus enabling the sliding seat to move along the width of the belt conveyor line. A third pneumatic slide table, arranged along the length of the belt conveyor line, is mounted on the sliding seat. A transverse sliding seat is mounted on the slide of the third pneumatic slide table, driving the transverse sliding seat to move along the length of the belt conveyor line. A horizontally arranged mounting plate is mounted at the bottom of the transverse sliding seat. A vertically arranged lifting cylinder is mounted on the transverse sliding seat. The piston rod of the lifting cylinder passes downward through the mounting plate and has a lifting seat at its end. The lifting cylinder drives the lifting seat to move vertically. To ensure stable operation of the lifting seat, a vertical guide sleeve is mounted on each side of the piston rod of the lifting cylinder on the mounting plate. A guide rod slides vertically within the guide sleeve, and the lower end of the guide rod is fixedly connected to the top of the lifting seat, forming a double-guide structure to prevent swaying during lifting. A rotating seat and a rotary motor that drives the rotating seat are rotatably mounted at the bottom of the lifting platform. A clamping assembly is located at the bottom of the rotating seat. The rotary motor drives the rotating seat to rotate, enabling 360° angle adjustment of the carrier to meet the requirements of the pick-and-place machine for the carrier's feeding direction. Through the combined action of the second and third pneumatic slides, the lifting cylinder, and the rotary motor, the clamping assembly can move in three directions—horizontal, horizontal, and vertical—as well as rotate 360° horizontally. This allows for actions such as clamping, lifting, transferring, reorienting, and lowering the PCB carrier, thus completing the transport of the PCB carrier.

[0028] The clamping assembly includes a bidirectional synchronous clamping cylinder located at the bottom of the rotating base. Clamping plates are mounted on the piston rod ends of both sides of the bidirectional synchronous clamping cylinder. Rubber anti-slip pads are attached to the inner side of the clamping plates to ensure secure clamping and prevent damage to the carrier surface. When the lifting cylinder raises the PCB carrier, the second pneumatic slide moves the clamping assembly above the PCB carrier. The third pneumatic slide fine-tunes the position so that the two clamping plates align with the two sides of the PCB carrier. The lifting cylinder lowers the clamping assembly, and the bidirectional synchronous clamping cylinder actuates to close the two clamping plates, achieving clamping. The lifting cylinder then resets, and the second pneumatic slide moves the PCB carrier above the second conveying assembly. The descent and release actions are repeated to complete the transfer of the PCB carrier.

[0029] The second conveying assembly includes a second frame, a second conveying frame, a conveying plate, and a support platform. There are two sets of conveying plates, which are slidably mounted on the second conveying frame along the conveying direction of the second conveying assembly. There are two sets of support platforms, which are slidably mounted on the corresponding conveying plates along the conveying direction of the second conveying assembly. The support platforms are used to place PCB board carriers.

[0030] Specifically, the second frame is welded from square steel and has a second conveyor frame mounted on it. The second conveyor frame includes three sets of uprights spaced apart along the width of the second frame. Third slide rails are arranged along the conveying direction of the second conveyor assembly on the inner sides of the uprights on both sides and on both sides of the upright in the middle. Third sliders are slidably mounted on the third slide rails. Fixed seats protrude downwards from both sides of the bottom of the conveyor plate, and these fixed seats are fixedly connected to the corresponding third sliders, allowing the conveyor plate to slide along the third slide rails. A fourth pneumatic slide is also installed on the second conveyor frame between adjacent sets of uprights. The bottom of the fixed seat is fixedly connected to the corresponding slide block of the fourth pneumatic slide. The movement of the fourth pneumatic slide drives the conveyor plate to slide along the third slide rails, achieving longitudinal conveying of the PCB board carrier.

[0031] Two sets of fourth slide rails, arranged at intervals along the conveying direction of the second conveying assembly, are arranged on the top surface of the conveyor plate. Fourth sliders are slidably mounted on these fourth slide rails, and the bottom of the support platform is fixedly connected to the corresponding fourth slider. A fifth pneumatic slide table is also provided on one side of the conveyor plate. A fixing plate is mounted on the slide base of the fifth pneumatic slide table, and a fixing block is mounted on the corresponding side of the support platform. The fixing plate and the fixing block are connected. The movement of the fifth pneumatic slide table drives the support platform to slide along the fourth slide rails, achieving longitudinal feeding of the PCB board carrier.

[0032] After the transport assembly places the carrier on the platform, the fourth pneumatic slide moves the entire conveyor plate towards the pick-and-place machine. When it approaches the feed inlet, the fifth pneumatic slide pushes the platform a short distance with precision, accurately delivering the carrier into the feeding mechanism inside the pick-and-place machine, completing one loading cycle. The two sets of conveyor plates allow for alternating feeding; while one set of platforms feeds the pick-and-place machine, the other set receives the carrier transferred by the transport assembly, significantly improving loading efficiency.

[0033] In this embodiment, an automatic feeding device for an SMT placement machine uses a PLC controller as the control core, and cooperates with photoelectric sensors, proximity switches, and other detection elements to achieve fully automated operation. The installation positions and functions of each detection element are as follows: a photoelectric sensor is installed at the entrance of the belt conveyor of the first conveyor assembly to detect whether the carrier has entered; a proximity switch is installed in the middle of the conveyor line to locate the lifting position of the carrier; a limit switch is installed on the sliding seat of the handling assembly to limit the lateral movement range; a pressure sensor is installed on the bearing platform of the second conveyor assembly to detect whether the carrier is placed in place; and a photoelectric sensor is installed at the feed port of the placement machine to provide feedback on whether material feeding is required.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. An automatic feeding device for an SMT pick and place machine, characterized in that: The system includes multiple sets of first conveying components (1) and second conveying components (2) arranged side by side. The conveying direction of the second conveying component (2) is arranged along the length direction of the SMT placement machine, and its discharge end is located at the inlet of the SMT placement machine. The conveying direction of the first conveying component (1) is perpendicular to the conveying direction of the second conveying component (2) and is arranged on one side of the inlet end of the second conveying component (2). The first conveying component (1) includes a first frame (10), and two sets of sliding plates (20) are slidably arranged on the first frame (10) along its length direction. (20) is provided with a belt conveyor (30). The sliding plate (20) drives the belt conveyor (30) to slide so that the belt conveyors (30) in the two adjacent sets of first conveyor components (1) move closer or further away from each other. A protective light grid (3) is provided between the two adjacent sets of first conveyor components (1). A fixed frame (40) is also provided on the first frame (10). A conveying component (50) is provided on the fixed frame (40). The conveying component (50) is used to transport the PCB board carrier on the belt conveyor (30) to the second conveyor component (2).

2. The automatic feeding device for an SMT placement machine according to claim 1, characterized in that: Two sets of first slide rails (11) with the same length direction are arranged at intervals on the first frame (10). Two first sliders (12) are slidably arranged on the first slide rails (11). The bottom of the two sets of sliding plates (20) are respectively fixedly connected to the two first sliders (12) on the corresponding first slide rails (11). Two sets of first pneumatic slides (13) are arranged between the two sets of first slide rails (11). A connecting seat (14) is provided on the slide base of the first pneumatic slide (13). A connecting plate (21) is provided on the sliding plate (20). The connecting plate (21) is connected to the connecting seat (14).

3. The automatic feeding device for an SMT placement machine according to claim 1, characterized in that: The belt conveyor (30) includes a first conveyor frame (31) mounted on a sliding plate (20). The top of the first conveyor frame (31) is provided with mounting rods (32) on both sides along the length direction. The mounting rods (32) are provided with a drive roller (33) and a driven roller (34) at both ends. The drive roller (33) and the driven roller (34) are connected by a first synchronous belt (35). The two drive rollers (33) are connected by a synchronous shaft (36). A synchronous wheel (361) is provided on the middle shaft of the synchronous shaft (36). A drive motor (37) is provided inside the first conveyor frame (31) at one end of the drive roller (33). A drive wheel (371) is provided on the output shaft of the drive motor (37). The drive wheel (371) is connected to the synchronous wheel (361) by a second synchronous belt (38).

4. The automatic feeding device for an SMT placement machine according to claim 3, characterized in that: The first conveyor frame (31) has a plurality of lifting cylinders (39) arranged at intervals along its length. The piston rod of the lifting cylinder (39) is upward and a lifting plate (391) is provided at its end.

5. The automatic feeding device for an SMT placement machine according to claim 1, characterized in that: The fixed frame (40) includes two gantry frames (41) spanning the belt conveyor line (30). One gantry frame (41) has a second slide rail (42) at its top, and the other gantry frame (41) has a second pneumatic slide table (43) at its top. A second slider (44) is slidably mounted on the second slide rail (42). The conveying assembly (50) includes a sliding seat (51). The bottom ends of the sliding seat (51) are fixedly connected to the slide seat of the second pneumatic slide table (43) and the second slider (44), respectively. The sliding seat (51) is provided with a slide rail (44) arranged along the length of the belt conveyor line (30). The third pneumatic slide (52) has a transverse slide (53) on its slide base. The bottom of the transverse slide (53) has a mounting plate (54) with a horizontally arranged plate surface. The transverse slide (53) has a vertically arranged lifting cylinder (55). The piston rod of the lifting cylinder (55) passes downward through the mounting plate (54) and has a lifting seat (56) at its end. The bottom of the lifting seat (56) has a rotating seat (57) and a rotary motor (58) that drives the rotating seat (57) to rotate. The bottom of the rotating seat (57) has a clamping assembly (59).

6. An automatic feeding device for an SMT placement machine according to claim 5, characterized in that: On the mounting plate (54), a vertical guide sleeve (541) is provided on each side of the piston rod of the lifting cylinder (55). A guide rod (542) is vertically slidably arranged inside the guide sleeve (541), and the lower end of the guide rod (542) is fixedly connected to the top of the lifting seat (56).

7. An automatic feeding device for an SMT placement machine according to claim 5, characterized in that: The clamping assembly (59) includes a bidirectional synchronous clamping cylinder (591) disposed at the bottom of the rotating seat (57), and clamping plates (592) are provided at the piston rod ends on both sides of the bidirectional synchronous clamping cylinder (591).

8. The automatic feeding device for an SMT placement machine according to claim 1, characterized in that: The second conveying assembly (2) includes a second frame (60), on which a second conveying frame (70) is provided. Two sets of conveying plates (80) are slidably arranged on the second conveying frame (70) along the conveying direction of the second conveying assembly (2). A support platform (90) is slidably arranged on the conveying plate (80) along the conveying direction of the second conveying assembly (2). The support platform (90) is used to place PCB board carriers.

9. An automatic feeding device for an SMT placement machine according to claim 8, characterized in that: The second conveyor frame (70) includes three sets of uprights (71) spaced apart along the width direction of the second frame (60). The inner sides of the uprights (71) on both sides and the two sides of the upright (71) in the middle are provided with third slide rails (72) along the conveying direction of the second conveying assembly (2). A third slider (73) is slidably provided on the third slide rail (72). Fixed seats (81) are provided on both sides of the bottom of the conveyor plate (80) and fixedly connected to the corresponding third slider (73). A fourth pneumatic slide (74) is also provided on the second conveyor frame (70) between two adjacent sets of uprights (71). The bottom of the fixed seat (81) is fixedly connected to the slide of the corresponding fourth pneumatic slide (74).

10. An automatic feeding device for an SMT placement machine according to claim 8, characterized in that: The top surface of the conveying plate (80) is provided with two sets of fourth slide rails (82) arranged at intervals along the conveying direction of the second conveying assembly (2). A fourth slider (83) is slidably arranged on the fourth slide rail (82). The bottom of the support platform (90) is fixedly connected to the fourth slider (83). A fifth pneumatic slide (84) is also provided on one side of the conveying plate (80). A fixing plate (85) is provided on the slide seat of the fifth pneumatic slide (84). A fixing block (91) is provided on the corresponding side of the support platform (90). The fixing plate (85) is connected to the fixing block (91).

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