A product delivery system

Abstract

The application relates to the technical field of packaging boxes, in particular to a product conveying system which comprises a conveying bus and a tray for carrying samples, the conveying bus is provided with a stacking station for stacking the tray, the conveying bus comprises two conveying buses, a gap is left between the two conveying buses, the upper surface of the tray is provided with positioning columns, the lower surface of the tray is provided with positioning holes, the stacking station comprises a stacking base and a stacking top base, the stacking base is vertically and slidably connected with a jacking plate, the center of the stacking top base is provided with a stacking opening, the upper surface of the stacking top base is vertically fixed with a limiting column, and the two sides of the stacking opening are horizontally and slidably connected with supporting plates for supporting the bottom of the tray. When a plurality of empty trays are stacked, the four positioning columns on the lower empty tray are inserted into the positioning holes of the upper empty tray, and the plurality of empty trays are inserted into each other when stacked, so that the stability of the empty tray is improved.

Description

Technical Field

[0001] The present application relates to the technical field of packaging boxes, and in particular to a product delivery system. Background Art

[0002] Scanning Ultrasonic Microscope (SAT) testing uses pure water as a medium to transmit ultrasonic signals. The system detects the differences in reflection rate and energy between high-frequency ultrasound and materials of varying densities. To increase automation, test samples are typically transported via automated conveyor lines.

[0003] For related technologies, please refer to the Chinese patent publication number CN117416727A, which discloses a fully automatic ultrasonic scanning microscope loading and unloading machine, which relates to the field of ultrasonic scanning technology, including a machine body, products and waterproof jigs, a robot loading and unloading station, and the robot loading and unloading station is fixedly installed on the top right side of the machine body, which can scan the product and grab and place it; a product pallet loading and unloading conveyor line, and a product pallet stacking station. The product pallet stacking station is located above the product pallet loading and unloading conveyor line and is used for stacking product pallets.

[0004] Product pallets are transported along conveyor lines. During the initial transport phase, delayed product discharge can lead to a buildup of material at the front of the conveyor line. To ensure the proper flow of material, stacking stations are added to accommodate excess pallets. However, as the number of pallets in a stack increases, the stack height gradually increases. Friction and shaking between pallets can easily cause the entire stack to collapse, impacting the overall product delivery process. Summary of the Invention

[0005] In order to ensure the stability of the pallet stack, the present application provides a product conveying system.

[0006] The product delivery system provided in this application adopts the following technical solution:

[0007] The stacking station comprises a stacking base and a stacking top seat, wherein the stacking base is located below the conveying belt and the stacking top seat is located above the conveying belt, and a lifting plate located in the gap is vertically slidably connected to the stacking base, and a stacking opening for the movement of the pallet is opened in the center of the stacking top seat, and an L-shaped limit column for limiting the corners of the pallet is vertically fixed on the upper surface of the stacking top seat at the four corners of the stacking opening, and support plates for supporting the bottom of the pallet are horizontally slidably connected on both sides of the stacking opening.

[0008] By adopting the above technical solution, the tray containing the sample is placed on the conveyor belt and transported from one end of the conveyor belt to the other end. During the transportation process, the robot removes the sample from the tray, and the empty tray continues to be transported. When the empty tray is transported to the stacking station, the empty tray is stacked. The empty tray is transported to the stacking port, and the lifting plate is lifted to push the empty tray from the bottom of the stacking port into the stacking port. The four limiting columns limit the four corners of the empty tray to improve the stability of the empty tray. When the empty tray is above the top seat of the stack, the support plates move toward each other to the bottom of the empty tray to support the empty tray. When multiple empty trays are stacked, the four positioning columns on the empty tray below are inserted into the positioning holes of the empty tray above. When several empty trays are stacked, they are plugged into each other, thereby improving the stability of the empty tray.

[0009] Preferably, a limit block for shielding the side of the pallet is vertically slidably connected to the stack base.

[0010] By adopting this technical solution, the stop block rises when an empty pallet is transported. When the empty pallet reaches the stacking station, it collides with the stop block, preventing further movement. At this point, the empty pallet is directly opposite the stacking opening. The stop block blocks and defines the position of the empty pallet, improving the accuracy of empty pallet stacking.

[0011] Preferably, a square positioning groove is provided in the center of the bottom of the tray, and a positioning block is provided on the upper surface of the lifting plate, which protrudes from the upper surface of the lifting plate and faces the positioning groove.

[0012] By adopting the above technical solution, when the lifting plate lifts the pallet, the positioning block is embedded in the positioning groove, and the positioning groove and the positioning block cooperate with each other to improve the stability of the lifting plate in lifting the pallet.

[0013] Preferably, the size of the positioning groove is larger than that of the positioning block, and the two sides of the positioning block are horizontally slidably connected with correction blocks facing the positioning groove, and the sliding direction of the correction block is perpendicular to the transmission direction of the conveyor belt.

[0014] By adopting the above technical solution, when the lifting plate lifts the pallet, the positioning block is embedded in the positioning groove. The two correction blocks move away from the positioning block. When the correction blocks are fully extended, they contact the sides of the positioning groove, thereby adjusting the position of the empty pallet, thereby ensuring the position accuracy of each empty pallet when stacking.

[0015] Preferably, a vertical sliding groove is provided on the upper surface of the positioning block, and a sliding block is slidably connected in the sliding groove. Drive grooves connected to the sliding groove are horizontally provided on both sides of the positioning block, and a driving rod is slidably connected in the driving groove. One end of the driving rod is connected to the correction block, and the other end is connected to the sliding block through a transmission mechanism. The transmission mechanism includes a driving screw rod horizontally rotatably connected to the sliding groove, and both ends of the driving screw rod are provided with threads with opposite rotation directions and are equipped with a nut seat, and the two driving rods are respectively connected to the two nut seats, and a sliding rack is vertically provided at the bottom of the sliding block, and a driving gear meshing with the sliding rack is coaxially fixed on the driving screw rod, and a number of return springs are provided between the sliding block and the sliding groove.

[0016] By adopting the above technical solution, when the positioning block follows the lifting plate to rise, the sliding block collides with the empty pallet, and as the positioning block gradually rises, the sliding block is gradually pressed into the sliding groove. When the sliding block moves toward the bottom of the sliding groove, the sliding rack drives the driving screw to rotate through the driving gear, and the driving screw synchronously drives the two driving rods to move in opposite directions through the nut, thereby driving the two correction blocks to move synchronously in opposite directions. If the positioning block is not in the center position of the positioning groove, the distance between the two correction blocks and the two sides of the positioning groove is not equal. As the two correction blocks move synchronously, one of the correction blocks will continue to move after contacting the side wall of the positioning groove, thereby pushing the pallet to slide until the correction block collides with the other side of the positioning groove. The pallet is restricted and cannot continue to move, and the positioning block is now located in the center of the positioning groove, thereby adjusting the position of the pallet. In the process of the lifting plate lifting the pallet, the correction block automatically moves to both sides of the positioning groove to adjust the position of the pallet, which is convenient to use.

[0017] Preferably, the upper surface of the lifting plate is provided with a plurality of arc-shaped protrusions.

[0018] By adopting the above technical solution, when the correction block pushes the pallet to slide, the pallet and the lifting plate are connected by the arc-shaped protrusion, the friction between the pallet and the lifting plate is small, and the lifting plate is more convenient to move.

[0019] Preferably, it also includes a conveying branch line parallel to the conveying main line, and a defective plate for placing unqualified samples is provided on the conveying branch line. The conveying branch line includes an upper conveyor belt and a lower conveyor belt parallel to each other. Adjustment seats are provided at both ends of the conveying branch line, and a lifting seat is vertically slidably connected to the adjustment seat. The lifting seat is provided with an adjustment belt whose transmission direction is consistent with the direction of the conveying branch line.

[0020] By adopting this technical solution, after sample testing, the robot places unqualified samples on a defective tray, which is then transported along the upper conveyor belt from one end to the other. The robot removes the unqualified samples at the other end of the upper conveyor belt and discharges them. The adjustment seat lowers the empty defective tray to the lower conveyor belt, which then transports the empty tray back to the end, where it awaits the next batch of unqualified samples.

[0021] Preferably, a hollow adjustment slot is provided in the middle of the adjustment belt, and a lifting plate for lifting the defective product tray is vertically slidably connected in the adjustment slot.

[0022] By adopting the above technical solution, the lifting plate adjusts the height of the defective tray. When taking and placing unqualified samples, the lifting plate lifts up the defective tray to ensure the stability of sample taking and placing.

[0023] In summary, this application has the following beneficial technical effects:

[0024] When multiple empty pallets are stacked, the four positioning posts on the lower empty pallet are inserted into the positioning holes of the upper empty pallet. When several empty pallets are stacked, they are plugged into each other, thereby improving the stability of the empty pallets. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0026] Figure 2 2 is a schematic structural diagram of a stacking station in an embodiment;

[0027] Figure 3 2. It is a structural diagram of a tray in an embodiment;

[0028] Figure 4 2. It is a structural diagram of the jacking plate in the embodiment;

[0029] Figure 5 Schematic diagram of the structure of the delivery branch line in the embodiment.

[0030] Description of reference numerals:

[0031] 1. Conveyor bus; 11. Conveyor main belt; 12. Limiting plate; 13. Top plate; 2. Pallet; 21. Positioning column; 22. Positioning hole; 23. Positioning slot; 3. Stack base; 4. Stack top seat; 41. Stack opening; 42. Limiting column; 5. Lifting plate; 51. Arc-shaped protrusion; 6. Support plate; 7. Limiting block; 8. Positioning block; 81. Correction block; 82. Sliding slot; 83. Sliding block; 831. Return spring; 84. Driving slot; 85. Driving rod; 86. Driving screw rod; 87. Nut seat; 88. Sliding rack; 89. Driving gear; 9. Conveyor branch line; 91. Defective tray; 92. Upper conveyor belt; 93. Lower conveyor belt; 94. Adjusting seat; 95. Lifting seat; 96. Adjusting belt; 97. Adjusting slot; 98. Lifting plate. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with all the accompanying drawings. Example

[0033] The present application discloses a product delivery system. Figure 1 , including a conveying bus 1 and a conveying branch line 9 which are parallel to each other. The conveying bus 1 is used to convey the tray 2 carrying the samples and the final qualified finished products. The conveying branch line 9 is used to convey the defective tray 91 carrying the unqualified samples.

[0034] Reference Figure 1 The conveyor bus 1 is sequentially equipped with a loading station, a stacking station, and an unloading station along its conveying direction. The conveyor bus 1 comprises two parallel conveyor belts 11, with a gap between them. Each loading and unloading station includes a limit plate 12 that slides vertically within the gap and a top plate 13 for lifting the pallet 2. Both the top plate 13 and the limit plate 12 are connected to vertically mounted cylinders.

[0035] Reference Figure 1 When the sample-laden tray 2 moves to the loading station, the limiting plate 12 at the loading station first rises. The upper end of the limiting plate 12 is higher than the upper end of the conveyor belt 11, and the tray 2 contacts the limiting plate 12, which restricts the tray 2. At this point, the tray 2 is directly opposite the top plate 13 at the loading station. The top plate 13 rises from the gap, lifting the tray 2 and separating it from the conveyor belt 11. The robot then removes the sample from the tray 2 for testing. The top plate 13 lowers the empty tray 2 onto the conveyor belt 11. The limiting plate 12 descends, and the conveyor belt 11 transports the empty tray 2 forward. When the empty tray 2 is transported to the unloading station, the limiting plate 12 and the top plate 13 at the unloading station cooperate to lift the empty tray 2. The robot places the qualified sample on the empty tray 2, and the top plate 13 lowers the tray 2 for final discharge.

[0036] Reference Figure 1 and Figure 2 The stacking station consists of a stacking base 3 and a stacking top 4, which are positioned opposite each other. The stacking base 3 is located below the main conveyor belt 11, while the stacking top 4 is located above the main conveyor belt 11. A lifting plate 5 and a stop block 7, located within the gap, are vertically slidably connected to the stacking base 3. The lifting plate 5 and the stop block 7 are each connected to the stacking base 3 via a vertically mounted cylinder. When the stop block 7 is raised, it contacts the side of the pallet 2, and the lifting plate 5 lifts the pallet 2.

[0037] Reference Figure 1 and Figure 2 A stacking opening 41 for accommodating the pallet 2 is provided at the center of the stacking base 3. The horizontal projection shape of the stacking opening 41 is the same as that of the pallet 2, and the size of the horizontal projection of the stacking opening 41 is slightly larger than the size of the horizontal projection of the pallet 2. L-shaped limiting columns 42 for limiting the corners of the pallet 2 are vertically fixed at the four corners of the stacking opening 41 on the upper surface of the stacking top seat 4. The lifting plate 5 pushes the pallet 2 into the stacking opening 41, and the pallet 2 is pushed to the top of the stacking top seat 4. The four corners of the pallet 2 are limited by the four limiting columns 42. The four limiting columns 42 wrap and block the four corners of the pallet 2, thereby improving the stability of the limiting columns 42 during stacking and preventing collapse.

[0038] Reference Figure 1 and Figure 3 Positioning posts 21 are vertically fixed at the four corners of the upper surface of the tray 2, and positioning holes 22 are formed on the lower surface of the tray 2, corresponding one-to-one with the positioning posts 21. When the trays 2 are stacked on the stacking top 4, the positioning posts 21 of the lower tray 2 are inserted into the positioning holes 22 of the upper tray 2, thereby further enhancing the stability of the trays 2 when stacked.

[0039] Reference Figure 1 and Figure 2 The stacking top seat 4 has cylinders mounted horizontally on both sides of the stacking opening 41. The output shafts of the cylinders are connected to support plates 6, which are used to support or release the bottom of the tray 2. The thickness of the support plates 6 is less than the height of the positioning posts 21. When the trays 2 are stacked on top of the stacking top seat 4, the two support plates 6 move toward each other, inserting into the lower surface of the bottom tray 2 and coming into contact with it.

[0040] Reference Figure 1 and Figure 2 When removing an empty tray, the lifting plate 5 is lifted and inserted into the stacking opening 41, where it contacts the bottom tray 2 in the stack. The two support plates 6 move in opposite directions and retract from under the tray 2. After the lifting plate 5 descends to the height of one tray 2, the two support plates 6 extend again to contact and support the second-to-last tray 2 below. The bottom tray 2 continues to descend along with the lifting plate 5 and is discharged onto the main conveyor belt 11.

[0041] Reference Figure 3 and Figure 4 A square positioning groove 23 is provided at the center of the bottom of the pallet 2, and a positioning block 8 is provided on the upper surface of the lifting plate 5, protruding from the upper surface of the lifting plate 5 and facing the positioning groove 23. When the lifting plate 5 lifts the pallet 2, the positioning block 8 is embedded in the positioning groove 23. The positioning groove 23 and the positioning block 8 cooperate with each other to improve the stability of the lifting plate 5 in lifting the pallet 2.

[0042] Reference Figure 3 and Figure 4 The size of the positioning groove 23 is larger than that of the positioning block 8. The two sides of the positioning block 8 are horizontally slidably connected to the correction blocks 81 that are opposite to the positioning groove 23. The sliding direction of the correction blocks 81 is perpendicular to the conveying direction of the conveyor belt 11. The upper surface of the lifting plate 5 is provided with a plurality of arc-shaped protrusions 51.

[0043] Reference Figures 1 to 4 When the pallet 2 is transported to the stacking station along the conveyor belt 11, the limit block 7 contacts the pallet 2 to limit the position of the pallet 2. The conveying direction of the conveyor belt 11 is called the x-direction, and the direction perpendicular to the x-direction on the horizontal plane is called the y-direction. Each pallet 2 is blocked by the limit block 7 when it moves to the stacking station, so when each pallet 2 moves to the stacking station, its position in the x-direction is basically the same position, with high accuracy. However, the position of the pallet 2 in the y-direction is prone to deviation. In this way, when the lifting plate 5 lifts the pallet 2, the positioning column 21 of the lower pallet 2 is easily misaligned with the positioning hole 22 of the upper pallet 2, thereby affecting the stability of the pallet 2 stack.

[0044] Reference Figure 3 and Figure 4 The correction blocks 81 adjust the position of the tray 2 in the y-direction. After the positioning block 8 is inserted into the positioning slot 23, the two correction blocks 81 slide synchronously toward the sides of the positioning slot 23. If the positioning block 8 is located at the center of the positioning slot 23, the tray 2 is in the normal stacking position. After the two correction blocks 81 move to their limit positions, they can simultaneously contact the two side walls of the positioning slot 23, thereby clamping the tray 2.

[0045] Reference Figure 3 and Figure 4If the positioning block 8 is not located at the center of the positioning groove 23, it means that the distance between one of the correction blocks 81 and the side wall of the positioning groove 23 is smaller than the distance between the other correction block 81 and the side wall of the positioning groove 23. Therefore, during the extension process of the two correction blocks 81, one of the correction blocks 81 will first contact the side wall of the positioning groove 23, and as the correction block 81 continues to extend, the correction block 81 will push the tray 2 to slide in the y direction until the other correction block 81 conflicts with the side wall of the positioning groove 23. Moreover, the arc-shaped protrusion 51 on the lifting plate 5 can reduce the lateral friction between the lifting plate 5 and the tray 2, facilitating the sliding adjustment of the tray 2. The two correction blocks 81 can adjust the position of the tray 2 in the y direction and cooperate with the limit block 7, thereby improving the position accuracy of each tray 2 when stacking and enhancing the stability of the tray 2 when stacking.

[0046] Reference Figure 4 Horizontal drive slots 84 are provided on both sides of the positioning block 8. The drive slots 84 are perpendicular to the conveying direction of the conveyor belt 11. A drive rod 85 is slidably connected to the drive slots 84. One end of the drive rod 85 extends out of the drive slot 84 and is connected to the correction block 81, and the other end is located inside the positioning block 8.

[0047] Reference Figure 4 The positioning block 8 has a vertically defined sliding slot 82 connected to the drive slot 84. A transmission mechanism is housed within the sliding slot 82. The transmission mechanism includes a drive screw 86 that is horizontally rotatably connected to the sliding slot 82. The drive screw 86 has oppositely threaded ends and is equipped with a nut holder 87. The ends of two drive rods 85, facing away from the correction block 81, are fixedly connected to the two nut holders 87, respectively. When the drive screw 86 rotates, the two nut holders 87, via the drive rods 85, synchronously drive the two correction blocks 81 toward or away from each other.

[0048] Reference Figure 4 A sliding block 83 is vertically slidably connected within the sliding groove 82. A sliding rack 88 is vertically fixed to the lower surface of the sliding block 83. A driving gear 89 is coaxially fixed to the driving screw 86 and meshes with the sliding rack 88. A plurality of return springs 831 are interposed between the sliding block 83 and the sliding groove 82. When the return springs 831 are in their natural state, the upper surface of the sliding block 83 protrudes above the upper surface of the positioning block 8, the driving rod 85 is retracted within the driving groove 84, and the correction block 81 contacts the side wall of the positioning block 8.

[0049] Reference Figure 3 and Figure 4When the positioning block 8 follows the lifting plate 5 to rise, the sliding block 83 collides with the empty pallet 2. As the positioning block 8 gradually rises, the sliding block 83 is gradually pressed into the sliding groove 82. When the sliding block 83 moves toward the bottom of the sliding groove 82, the reset spring 831 is compressed, and the sliding rack 88 drives the driving screw 86 to rotate through the driving gear 89. The driving screw 86 synchronously drives the two driving rods 85 to move in opposite directions through the nut 87, thereby driving the two correction blocks 81 to move synchronously in opposite directions until they collide with the side walls of the positioning groove 23. The correction block 81 adjusts the position of the pallet 2 in the y direction. After the pallet 2 is stacked, the lifting plate 5 moves down and separates from the pallet 2. The sliding block 83 and the correction block 81 are reset under the action of the reset spring 831. Through the setting of the sliding block 83 and the driving screw 86, when the lifting plate 5 lifts the pallet 2, the correction block 81 automatically extends to adjust the position of the pallet 2, which is convenient to use.

[0050] Reference Figure 5 The feeder line 9 comprises a parallel upper conveyor belt 92 and a lower conveyor belt 93. Adjustment seats 94 are located at each end of the feeder line 9, one for input and the other for output. A lifting seat 95 is vertically slidably connected to the adjustment seat 94. This lifting seat 95 is equipped with an adjustment belt 96, which has a transmission direction aligned with that of the feeder line 9. A hollow adjustment slot 97 is defined in the center of the adjustment belt 96. A lifting plate 98, used to lift the defective tray 91, is vertically slidably connected to the adjustment slot 97.

[0051] Reference Figure 5 After the samples are tested, the lifting platforms 95 on the input and output stations simultaneously rise to align with the upper conveyor belt 92. The lifting plate 98 on the input station lifts the defective tray 91, and the robot places the unqualified samples on the defective tray 91. The lifting plate 98 on the input station descends, lowering the defective tray 91 onto the adjustment belt 96. The defective tray 91 is then transported from the input station to the output station along the upper conveyor belt 92. The lifting plate 98 on the output station lifts the defective tray 91, and the robot removes the unqualified samples from the output station.

[0052] Reference Figure 5 , the lifting plates 98 on the output seat and the input seat are lowered at the same time to be flush with the lower conveyor belt 93. The lifting plate 98 on the output seat is lowered, and the defective tray 91 is placed on the adjustment belt 96. The empty defective tray 91 is transported from the lower conveyor belt 93 to the input seat again, waiting for the next batch of unqualified samples.

[0053] The implementation principle of a product conveying system in an embodiment of the present application is as follows: a tray 2 containing samples to be inspected is input from one end of the conveyor belt 11 and conveyed to the other direction through the conveyor belt 11. When the tray 2 is conveyed to the loading station, an external robot takes the sample to be inspected for inspection. The empty tray 2 is conveyed to the stacking station for stacking. After the inspection is completed, if the sample is qualified, an empty tray 2 is lowered from the stacking station to the conveyor belt 11 and conveyed to the unloading station. The external robot places the qualified sample on the empty tray 2 and discharges it. If the sample is unqualified, the external robot conveys the sample to the defective tray 91 and conveys it to the conveyor branch line 9 for discharge.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A product conveying system, comprising a conveying bus (1) and a tray (2) for carrying samples, wherein the conveying bus (1) is provided with a stacking station for stacking the trays (2), the conveying bus (1) comprising two mutually parallel conveying belts (11), a gap being left between the two conveying belts (11), and characterized in that: The upper surface of the pallet (2) is evenly provided with a plurality of positioning posts (21) in a circumferential direction, and the lower surface of the pallet (2) is provided with positioning holes (22) corresponding to the positioning posts (21). The stacking station includes a stacking base (3) and a stacking top seat (4). The stacking base (3) is located below the conveyor belt (11), and the stacking top seat (4) is located above the conveyor belt (11). A lifting plate (5) located in the gap for lifting the pallet (2) is vertically slidably connected to the stacking base (3). A stacking plate (5) for moving the pallet (2) is provided in the center of the stacking top seat (4). The stack opening (41) is vertically fixed with L-shaped limiting columns (42) at the four corners of the stack opening (41) on the upper surface of the stack top seat (4) for limiting the corners of the tray (2). The two sides of the stack opening (41) are horizontally slidably connected with support plates (6) for supporting the bottom of the tray (2). A square positioning groove (23) is provided in the center of the bottom of the tray (2). The upper surface of the lifting plate (5) is provided with a positioning block (8) protruding from the upper surface of the lifting plate (5) and facing the positioning groove (23). The size of the positioning groove (23) is larger than the size of the positioning block (8). The positioning block (8) ) are horizontally slidably connected on both sides of the positioning block (8) with a correction block (81) facing the positioning groove (23), the sliding direction of the correction block (81) is perpendicular to the transmission direction of the conveyor belt (11), the upper surface of the positioning block (8) is provided with a vertical sliding groove (82), the sliding groove (82) is slidably connected with a sliding block (83), the two sides of the positioning block (8) are horizontally provided with a driving groove (84) connected to the sliding groove (82), the driving groove (84) is slidably connected with a driving rod (85), one end of the driving rod (85) is connected to the correction block (81), and the other end is connected to the correction block (81) through a transmission. The mechanism is connected to the sliding block (83), and the transmission mechanism includes a driving screw (86) that is horizontally rotatably connected to the sliding groove (82). The two ends of the driving screw (86) are provided with threads with opposite rotation directions and are equipped with a nut seat (87). Two driving rods (85) are respectively connected to the two nut seats (87). A sliding rack (88) is vertically provided at the bottom of the sliding block (83). A driving gear (89) that meshes with the sliding rack (88) is coaxially fixed on the driving screw (86). A plurality of return springs (831) are provided between the sliding block (83) and the sliding groove (82).

2. A product delivery system according to claim 1, characterized in that: A limiting block (7) for shielding the side of the tray (2) is vertically slidably connected to the stack base (3).

3. A product delivery system according to claim 1, characterized in that: The upper surface of the lifting plate (5) is provided with a plurality of arc-shaped protrusions (51).

4. A product delivery system according to claim 1, characterized in that: The invention also includes a conveying branch line (9) parallel to the conveying main line (1), a defective tray (91) for placing unqualified samples is provided on the conveying branch line (9), the conveying branch line (9) includes an upper conveyor belt (92) and a lower conveyor belt (93) parallel to each other, and an adjustment seat (94) is provided at both ends of the conveying branch line (9), a lifting seat (95) is vertically slidably connected to the adjustment seat (94), and an adjustment belt (96) is provided on the lifting seat (95) whose transmission direction is consistent with the direction of the conveying branch line (9).

5. A product delivery system according to claim 4, characterized in that: A hollow adjustment slot (97) is provided in the middle of the adjustment belt (96), and a lifting plate (98) for lifting the defective product tray (91) is vertically slidably connected in the adjustment slot (97).

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