Double-layer product conveying line

Abstract

The invention relates to the technical field of conveying lines, in particular to a double-layer product conveying line which comprises a main conveying area, a feeding area, a material taking area and a tray allowing the conveying line to circulate, the feeding area, the main conveying area and the material taking area are arranged in sequence, and the main conveying area, the feeding area and the material taking area are each provided with a rack. An upper layer of synchronous belt and a lower layer of synchronous belt are installed on the machine frame of the main conveying area, a layer of synchronous belt is installed on the machine frame of the feeding area and the material taking area, telescopic rods are installed at the bottoms of the machine frame of the feeding area and the material taking area, and supporting strips are installed at the positions of the synchronous belts of the main conveying area, the feeding area and the material taking area. The nylon belt rotating along with the synchronous belt is arranged in the supporting strip, synchronous rotation of the nylon belt is utilized, on one hand, the synchronous belt is supported, on the other hand, abrasion to the synchronous belt can be reduced, and therefore the service life of the synchronous belt is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of conveyor technology, and more specifically to a double-layer product conveyor line. Background Technology

[0002] In the semiconductor field, water immersion ultrasonic testing (SAT) is one method for detecting wafer bonding defects. An ultrasonic transmitter and receiver generate ultrasonic waves of a specific frequency (5MHz-70MHz), which are transmitted to the object under test using deionized water as the coupling medium. Because ultrasonic wave transmission requires a continuous medium, reflections occur when encountering discontinuous interfaces such as bubbles, impurities, or cracks. When the ultrasonic signal passes through the object under test, reflections occur due to differences in materials and at defect or crack interfaces. The ultrasonic transducer receives the reflected echoes, which are then transmitted to a data acquisition card. After waveform signal processing, a high-resolution ultrasonic image is obtained.

[0003] When SAT machines are operating, pallets are used to carry and transport product workpieces. When the workpieces are finished and output, the pallets are empty and need to be moved back to the initial feeding position. Conventional pallet transfer is done manually, which is inefficient. There are also some conveyor lines with automatic pallet return. These conveyor lines are generally two-layered. Due to the long conveying distance, components such as support strips are needed for the conveyor belt to prevent the conveyor belt from sagging or the load from settling. However, since current conveyor lines mainly use synchronous belts, which have synchronous teeth on the inner side, and the existing support strips do not have additional design, the synchronous teeth and the surface of the support strips rub against each other continuously. The fineness of the support strip surface directly determines the wear rate of the synchronous belt. Since the support strip surface is generally not treated, this leads to continuous friction between the support strips and the synchronous teeth, which significantly reduces the service life of the synchronous belt. Summary of the Invention

[0004] To achieve the above objectives, the present invention specifically adopts the following technical solution: A double-layer product conveyor line includes three parts: a main conveying area, a feeding area, and a picking area, as well as a tray for the conveyor line to circulate. The feeding area, main conveying area, and picking area are arranged sequentially. Each of the main conveying area, feeding area, and picking area is equipped with a frame. The frame of the main conveying area is equipped with two layers of synchronous belts, and the frames of the feeding area and picking area are equipped with one layer of synchronous belt. The bottom of the frames of the feeding area and picking area are equipped with telescopic rods. Support strips are installed at the positions of the synchronous belts in the main conveying area, feeding area, and picking area.

[0005] Furthermore, a ring-shaped nylon belt is installed inside the support bar via multiple guide rollers, and the nylon belt contacts the corresponding synchronous belt. The wear resistance coefficient of the material that rotates with the synchronous belt is generally equal to or slightly lower than the friction coefficient of the synchronous belt to avoid premature wear of one of them. If necessary, the nylon belt can be replaced with other materials.

[0006] Furthermore, multiple support rods are installed on the support strip at positions corresponding to the lower part of the nylon strip to support it. This prevents the long nylon strip from sagging downwards and rubbing against the bottom of the support strip, thus avoiding accelerated wear.

[0007] Furthermore, corner blocks are installed at each of the four corners of the tray using fixing bolts. A limiting ball cavity is pre-set at the center of the outer end of each fixing bolt, and a steel ball is installed inside the limiting ball cavity, with the steel ball protruding from the end of the fixing bolt. The steel ball contacts the frame, reducing frictional resistance during contact and thus ensuring smooth tray transport.

[0008] Furthermore, the pallet includes a central support block, with side support blocks on both the front and rear sides. An electrically operated telescopic rod connected to the side support blocks is installed at the bottom of the central support block. A copper base is fixed at the center of the bottom of the central support block, and multiple support columns are fixed at the top of the side support blocks. This gives the pallet an adjustable width function, allowing it to be adjusted according to the width of the conveyor line.

[0009] Furthermore, a sliding cylinder is installed at the bottom of the intermediate support block, and a support rod that slides along the cylinder is installed inside the cylinder. One end of the support rod is fixed to the two side supports at corresponding positions. This works in conjunction with the electric telescopic rod to maintain the overall structural strength of the tray.

[0010] Furthermore, a top plate is fixed to the top of the middle support block. The width of the top plate is greater than the maximum outward extension length of the two side support blocks, and a groove is formed on the top plate corresponding to the position of the support column. The top plate covers the gap between the middle support block and the two side support blocks.

[0011] Furthermore, a stopper mechanism is provided on the main conveying area. The stopper mechanism includes a fixed base, a lifting cylinder is mounted on the top of the fixed base, a support plate is mounted on the lifting end of the lifting cylinder, and an electrical contact is fixed on the support plate corresponding to the position of the copper base. The circuit is connected by contact, and continuous connection is not required.

[0012] Furthermore, a limit cylinder and a photoelectric sensor are installed on the left side of the pallet in the main conveying area to ensure safety during the inserting process.

[0013] Furthermore, it also includes a waiting area, located between the main conveyor area and the material handling area. A second frame is installed in the waiting area, with a second synchronous belt mounted on the second frame at the same height as the synchronous belts on the upper and lower sides of the main conveyor area. This design allows the main conveyor line to continue conveying materials while the material handling area is handling them, thus improving conveying efficiency.

[0014] The beneficial effects of this invention are as follows: 1. The present invention provides a nylon belt that rotates with the synchronous belt inside the support bar. The synchronous rotation of the nylon belt supports the synchronous belt on the one hand and reduces wear on the synchronous belt on the other hand, thereby ensuring the service life of the synchronous belt.

[0015] 2. In this invention, steel balls are placed on the pallet. When the pallet is tilted and comes into contact with the frame, the steel balls can reduce the contact friction resistance with the frame, thereby ensuring the smooth transport of the pallet.

[0016] 3. The present invention includes a cutting mechanism. When additional workpieces are manually added midway, the system can execute the cutting procedure to control the entire conveying process and avoid conveying chaos or safety issues caused by manual cutting.

[0017] 4. In this invention, the waiting area can temporarily store workpieces without affecting the normal operation of the main conveying area and the material picking area of ​​the preceding and following processes, thereby shortening the waiting time of the entire system and improving work efficiency. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the main conveying area in this invention; Figure 3 This is a schematic diagram of the waiting area in this invention; Figure 4 This is a schematic diagram of the material handling area in this invention; Figure 5 This is a perspective view of the support strip in this invention; Figure 6 This is a cross-sectional view of the support strip in this invention; Figure 7 This is a perspective view of the inserting mechanism in this invention; Figure 8 This is a bottom view of the tray in this invention; Figure 9 This is an exploded view of the tray in this invention; Figure 10 This is a schematic diagram of the steel ball arrangement in this invention; Figure 11 This is a schematic diagram of the workpiece setup in this invention.

[0019] Attached reference numerals: 1. Main conveying area; 11. Frame 1; 12. Shaft seat 1; 13. Axle 1; 14. Synchronous pulley 1; 15. Synchronous belt 1; 16. Motor 1; 17. Transmission belt 1; 18. Limit cylinder 1; 19. Photoelectric sensor; 110. Fixed frame 1; 111. Support bar 1; 2. Waiting area; 21. Frame 2; 22. Shaft seat 2; 23. Axle 2; 24. Synchronous pulley 2; 25. Synchronous belt 2; 26. Motor 2; 27. Transmission belt 2; 28. Lifting cylinder 1; 29. ​​Fixed frame 2; 210. Support bar 2; 3. Feeding area; 4. Unloading area; 41. Frame 3; 42. Shaft seat 3; 43. Axle 3; 44. Synchronous pulley 3; 45. Synchronous belt 3; 46. 47. Motor 3; 48. Transmission belt 3; 49. Lifting cylinder 2; 40. Support bar 3; 41. Guide roller; 492. Nylon belt; 493. Support rod; 410. Position stop; 411. Base; 412. Pneumatic telescopic rod; 413. Sliding sleeve; 414. Sliding rod; 5. Insertion mechanism; 51. Fixed seat; 52. Lifting cylinder; 53. Limiting cylinder 2; 54. Support plate; 55. Electrical contact; 6. Pallet; 61. Middle support block; 62. Side support blocks; 63. Top plate; 64. Support column; 65. Groove; 66. Electric telescopic rod; 67. Sliding cylinder; 68. Support rod; 69. Copper seat; 610. Corner block; 611. Fixing bolt; 612. Steel ball; 613. Limiting ball cavity; 7. Workpiece. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0021] This application provides a double-layer product conveyor line, mainly solving the problem of direct friction between the support bar and the timing belt, which leads to wear and affects the service life of the timing belt. The following technical solution is provided, which will be discussed in conjunction with... Figures 1-11 Please provide a detailed explanation: A double-layer product conveyor line includes four parts: a main conveying area 1, a waiting area 2, a feeding area 3, and a picking area 4. The main conveying area 1 is the longest. The main conveying area 1 includes a frame 11. The left and right ends of the frame 11 are respectively equipped with a shaft seat 12 and a wheel axle 13 at the top and bottom positions. The wheel axle 13 and the corresponding shaft seat 12 are equipped with synchronous pulleys 14. The corresponding synchronous pulleys 14 at the left and right ends of the frame 11 are equipped with synchronous belts 15. The right side of the frame 11 is equipped with a motor 16 near the wheel axle 13. The output end of the motor 16 is connected to the wheel axle 13 at the corresponding position through a transmission belt 17. A fixing frame 110 is fixed in the middle of the frame 11, corresponding to the position between the upper and lower synchronous belts 15. A limit cylinder 18 is installed at the bottom left side of the frame 11. Photoelectric sensors 19 are installed on the right side of the limit cylinder 18, the fixing frame 110, and the right side of the motor 16. A support strip 111 is installed on the frame 11, corresponding to the position of the synchronous belt 15. Waiting area 2 is used to receive workpieces 7 and pallets 6 carrying workpieces 7 from main conveying area 1. At the same time, it temporarily stores workpieces 7 when the material picking area 4 has not finished picking up the material. Waiting area 2 includes frame 21. Wheel axle 23 and bearing seat 22 are installed at the upper and lower positions of the left and right ends of frame 21, respectively. Synchronous pulleys 24 are installed at both ends of wheel axle 23 and on the corresponding bearing seat 22. Synchronous belts 25 are installed on the corresponding synchronous pulleys 24 at the left and right ends of frame 21. Motor 26 is installed on the left side of frame 21 near wheel axle 23. The output end of motor 26 is connected to wheel axle 23 at the corresponding position through transmission belt 27. A fixing frame 29 is fixed on the left side of the frame 21, corresponding to the position of the upper synchronous belt 25. A lifting cylinder 28 and a photoelectric sensor 19 are installed on the top of the fixing frame 29. A support bar 210 is installed on the frame 21, corresponding to the position of the synchronous belt 25. The feeding area 3 receives the returned empty pallet 6, and at the same time grabs the workpiece 7 transferred from the previous process and places it on the empty pallet 6, and then transfers it downwards. The picking area 4 is used to return the empty pallet 6 to the feeding area 3 via the lower conveyor belt of the main conveyor area 1 and the waiting area 2 after the workpiece 7 is grabbed. The picking area 4 includes a frame 3 41. The left and right ends of the frame 3 41 are respectively equipped with axle 3 43 and bearing 3 42. The two ends of the axle 3 43 and the corresponding bearing 3 42 are equipped with synchronous belt pulley 3 44. The synchronous belt 3 45 is installed on the corresponding synchronous belt pulley 3 44 at the left and right ends of the frame 3 41. The left side of the frame 3 41 is equipped with a motor 3 46 near the axle 3 43. The output end of the motor 3 46 is connected to the axle 3 43 at the corresponding position through a transmission belt 3 47. A positioning stop 410 is installed on the side of the frame 3 41 away from the waiting area 2. A photoelectric sensor 19 is installed at the bottom of the frame 3 41 to the left of the positioning stop 410. A base 411 is installed directly below the frame 3 41. A pneumatic telescopic rod 412 is installed at the middle of the bottom of the base 411. The telescopic end of the pneumatic telescopic rod 412 is fixed to the corresponding position of the frame 3 41. Slide rods 414 are fixed at the four corners of the bottom of the frame 3 41. A sliding sleeve 413 is installed on the base 411 at the position corresponding to the sliding rod 414. The sliding rod 414 extends into the sliding sleeve 413 at the corresponding position for sliding support. A support bar 49 is installed on the frame 3 41 at the position corresponding to the synchronous belt 3 45. The structure of feeding area 3 is the same as that of feeding area 4.

[0022] The top surfaces of support bars 111, 210, and 49 respectively abut against the corresponding synchronous belts 15, 25, and 45. The cross-sections of support bars 111, 210, and 49 are all U-shaped. Multiple guide rollers 491 with equal spacing are installed inside support bars 111, 210, and 49. Nylon belts 492 forming a ring are installed on the guide rollers 491. Multiple support rods 493 with equal spacing are installed on support bars 111, 210, and 49 below the nylon belts 492. Holes are opened on support bars 111, 210, and 49 at the positions corresponding to the guide rollers 491 and support rods 493. The guide rollers 491 and support rods 493 are inserted and installed at the corresponding opening positions.

[0023] An empty pallet 6 is first placed on the synchronous belt of the feeding area 3. At this time, the robot arm at this position grabs the workpiece 7 that has been transferred here and places it on the empty pallet 6. Then, the motor at this position starts and drives the synchronous belt to rotate, conveying the pallet 6 with the workpiece 7 to the main conveying area 1. At the same time, the motor 16 on the upper layer of the main conveying area 1 works and drives the upper synchronous belt 15 to rotate, receiving the pallet 6 loaded with workpiece 7 from the feeding area 3 and conveying it to the waiting area 2. When the pallet 6 reaches the right end of the main conveying area 1 and is detected by the photoelectric sensor 19 at this position; The upper motor 26 in the waiting area 2 drives the upper synchronous belt 25 to rotate, receiving the pallet 6 loaded with workpiece 7 from the main conveying area 1. Since the photoelectric sensor 19 in the waiting area 2 is set to the left, when the photoelectric sensor 19 changes from recognizing an object to not recognizing an object, it indicates that the pallet 6 is in the middle position of the waiting area 2. At this time, the upper motor 26 stops working, and then the lifting cylinder 28 works to lift the pallet 6 loaded with workpiece 7 upward to a certain height, so that it is separated from the upper synchronous belt 25. After the material is picked up in the picking area 4, the lifting cylinder 28 descends, causing the pallet 6 to contact the upper synchronous belt 25 again. At the same time, the upper motor 26 starts working again, driving the upper synchronous belt 25 to rotate and transport the pallet 6 to the picking area 4. Simultaneously, the motor 3 46 at the picking area 4 starts working, driving the synchronous belt 3 45 to rotate and receive the pallet 6 transported from the waiting area 2. When the photoelectric sensor 19 at the picking area 4 detects an object, the motor 3 46 stops working, and the robot at this position can grab the workpiece 7. When the photoelectric sensor 19 does not detect an object, the pneumatic telescopic rod 412 retracts, driving the entire frame 3 41 to descend, so that the surface height of the synchronous belt 3 45 switches from being aligned with the upper synchronous belt 25 in the waiting area 2 to being aligned with the lower synchronous belt 25. Then motor 3 46 works, and at this time it reverses. Using synchronous belt 3 45, the empty pallet 6 is transported to the waiting area 2. Simultaneously, motor 2 26 in the lower layer of waiting area 2 works, driving synchronous belt 2 25 in the lower layer to rotate, receiving the empty pallet 6 and transporting it to the main conveying area 1. Simultaneously, when the photoelectric sensor 19 on the right side of the main conveying area 1 detects an object, motor 16 in the lower layer of the main conveying area 1 works, driving synchronous belt 15 in the lower layer to work, receiving the pallet 6 and transporting it to the feeding area 3. When the photoelectric sensor 19 on the left side of the main conveying area 1 detects an object, the motor 16 on the lower layer of the main conveying area 1 stops working. At the same time, the limit cylinder 18 on the left side of the main conveying area 1 rises to block the tray 6. When the feeding area 3 is feeding, the limit cylinder 18 continues to rise to block. When the feeding area 3 finishes feeding, the pneumatic telescopic rod 412 at the position of the feeding area 3 descends, driving the frame at the position of the feeding area 3 to descend and align with the lower synchronous belt 15 of the main conveying area 1. At this time, the limit cylinder 18 descends, the motor 16 works, and the motor at the position of the feeding area 3 works synchronously to receive the empty tray 6 conveyed from the main conveying area 1. When the photoelectric sensor 19 at the feeding area 3 detects an object, the pneumatic telescopic rod 412 of the feeding area 3 is lifted, so that the synchronous belt of the feeding area 3 is aligned with the synchronous belt 15 on the upper layer of the main conveyor area 1. At this time, the robot arm at the feeding area 3 grabs the workpiece 7 that has been transferred here again and places it on the empty tray 6, forming one cycle. When the synchronous belts 15, 25, and 45 rotate, one side of their synchronous teeth contacts the top surfaces of the corresponding support bars 111, 210, and 49. Utilizing the natural drooping of the synchronous belts 15, 25, and 45, as well as the downward effect of the loaded objects, combined with friction, the nylon belt 492 is driven to rotate, forming a synchronous movement between the nylon belt 492 and each synchronous belt, thereby reducing the frictional wear of the support bars on the synchronous belts.

[0024] In some embodiments, a lifting cylinder 2 48 is installed at the bottom center of frame 3 41.

[0025] When the pallet 6 loaded with workpiece 7 is transported to the synchronous belt 3 45 in the material handling area 4, before the robot arm grabs the workpiece 7, the lifting cylinder 2 48 works first to lift the pallet 6 upward to a certain height so that it is separated from the synchronous belt 3 45. Then the robot arm grabs the workpiece 7. After the grabbing is completed, the lifting cylinder 2 48 descends to reset.

[0026] In some embodiments, corner blocks 610 are installed at the four corners of the tray 6 by fixing bolts 611. A limiting ball cavity 613 is preset at the center of the outer end of the fixing bolt 611. A steel ball 612 is installed in the limiting ball cavity 613, and the steel ball 612 protrudes from the end of the fixing bolt 611.

[0027] When pallet 6 is conveyed on the synchronous belt, the amount of contact surface with the belts on both sides directly affects whether pallet 6 can be conveyed smoothly. Therefore, the side of pallet 6 generally needs to be close to the inner surface of the frame to limit the pallet 6 and prevent it from tilting. When pallet 6 contacts the frame, frictional resistance will cause the pallet 6 to tilt further. By adjusting the fixing depth of the fixing bolt 611, the contact distance between the steel ball 612 and the frame can be adjusted. When the steel ball 612 contacts the surface of the frame, the frictional force can be used to make the steel ball 612 rotate in the limiting ball cavity 613, reducing the frictional resistance when pallet 6 contacts the frame, thereby ensuring the smooth conveying of pallet 6.

[0028] In some embodiments, the pallet 6 includes a middle support block 61, with side support blocks 62 on both the front and rear sides of the middle support block 61. Electric telescopic rods 66 are installed at both ends of the bottom of the middle support block 61. The telescopic ends of the electric telescopic rods 66 are fixed to the corresponding side support blocks 62. A copper base 69 is fixed at the middle of the bottom of the middle support block 61. The copper base 69 is electrically connected to the electric telescopic rods 66. Multiple support columns 64 are fixed at the top of the side support blocks 62, and the workpiece 7 is supported on the top of the support columns 64.

[0029] The middle support block 61 and the two side support blocks 62, combined with the electric telescopic rod 66, allow the width of the tray 6 to be adjusted as needed.

[0030] In some embodiments, a sliding cylinder 67 is installed at both ends of the bottom of the middle support block 61 near the middle position. A support rod 68 that slides along the sliding cylinder 67 is installed in the sliding cylinder 67 at both ends. One end of the support rod 68 at both ends is fixed to the two side supports 62 at the corresponding positions. A top plate 63 is fixed to the top of the middle support block 61. The width of the top plate 63 is greater than the maximum outward extension length of the two side supports 62. A groove 65 is provided on the top plate 63 at the position corresponding to the support column 64.

[0031] The support rod 68 works in conjunction with the slide cylinder 67 to increase the support stability of the two side blocks 62 and the middle block 61.

[0032] In some embodiments, a stopper mechanism 5 is provided at the bottom center of the main conveying area 1. The stopper mechanism 5 includes a fixed base 51, which is fixed at the bottom of the frame 11 at the corresponding position. A lifting cylinder 52 is installed on the top of the fixed base 51. A support plate 54 is installed on the lifting end of the lifting cylinder 52. An electrical contact 55 is fixed on the support plate 54 at the position corresponding to the copper base 69. An opening is provided on the frame 11 at the position corresponding to the support plate 54.

[0033] The aforementioned double-layer conveyor line allows switching between the upper and lower pallets only from the feeding area 3 or the picking area 4 at either end. This type of double-layer conveyor line is suitable for fully automated, enclosed conveying environments where manual intervention is difficult or impossible. If manual intervention is possible, such as removing a workpiece 7 midway for inspection, observation, or other operations, the workpiece must be re-inserted into the conveying queue midway since the feeding position has already been scanned. Currently, re-insertion typically requires manually blocking the preceding photoelectric sensor to prevent further conveying before adding the workpiece later. This method is unsafe and unreliable. Therefore, a re-insertion mechanism 5 is provided, allowing manual insertion of the necessary workpieces. The pallet 6 is placed on the pallet plate 54, and the copper base 69 is made in contact with the electrical contact 55. The inserting procedure is started, and then the conveyor line automatically stops the upper conveyor. At the same time, the electric contact 55 is used to conduct power to control the electric telescopic rod 66 to retract, which drives the two side blocks 62 to move closer to the middle block 61, so that the width of the pallet 6 is reduced so that it can pass between the two synchronous belts. At the same time, the lifting cylinder 52 drives the pallet plate 54 to lift and align with the upper synchronous belt. At this time, the workpiece 7 to be inserted is placed on the pallet 6, and then the electric telescopic rod 66 extends so that the two side blocks 62 can fall on the upper synchronous belt for conveying.

[0034] In some embodiments, a limit cylinder 53 and a photoelectric sensor 19 are installed on the left side of the tray 54 on the frame 11.

[0035] The pallet 6 can be lifted directly by the limit cylinder 2 53 to block an empty pallet 6 being transported by the lower synchronous belt 15, without the need to manually put the pallet 6 in.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-layer product conveying line comprising three parts of a main conveying zone (1), a feeding zone (3) and a taking zone (4), and a tray (6) for the conveying line to flow, the feeding zone (3), the main conveying zone (1) and the taking zone (4) are sequentially arranged, characterized in that, The main conveying area (1), the feeding area (3) and the material taking area (4) are provided with racks, the rack of the main conveying area (1) is provided with two layers of synchronous belts, the rack of the feeding area (3) and the material taking area (4) is provided with one layer of synchronous belt, the bottom of the rack of the feeding area (3) and the material taking area (4) is provided with an extension rod, and the synchronous belt of the main conveying area (1), the feeding area (3) and the material taking area (4) is provided with a supporting strip.

2. A double layer product conveyor line according to claim 1, characterized in that A nylon belt (492) is arranged in the supporting strip through a plurality of guide rollers (491), and the nylon belt (492) is in contact with the synchronous belt at the corresponding position.

3. A double layer product conveyor line according to claim 2, characterized in that A plurality of supporting rods (493) are arranged on the supporting strip and support the nylon belt (492).

4. A dual level product conveyor line as defined in claim 1, wherein, The four corners of the tray (6) are provided with corner blocks (610) through fixing bolts (611), the outer end center position of the fixing bolt (611) is provided with a limiting ball cavity (613), a steel ball (612) is arranged in the limiting ball cavity (613), and the steel ball (612) partially protrudes from the end of the fixing bolt (611).

5. A dual level product conveyor line according to claim 4, wherein, The tray (6) comprises a middle supporting block (61), two side supporting blocks (62) are arranged on the front and rear sides of the middle supporting block (61), an electric telescopic rod (66) is arranged at the bottom of the middle supporting block (61) and connected with the two side supporting blocks (62), a copper base (69) is fixed at the middle position of the bottom of the middle supporting block (61), and a plurality of supporting columns (64) are fixed on the top of the two side supporting blocks (62).

6. A dual level product conveyor line according to claim 5, wherein, The bottom of the middle supporting block (61) is provided with a sliding cylinder (67), the sliding cylinder (67) is provided with a supporting rod (68) sliding therein, and one end of the supporting rod (68) is fixed with the two side supporting blocks (62) at the corresponding position.

7. A dual level product conveyor line as defined in claim 5, wherein, The top of the middle supporting block (61) is provided with a top plate (63), the width of the top plate (63) is greater than the maximum extension length of the two side supporting blocks (62), and a groove (65) is formed in the top plate (63) at the position corresponding to the supporting column (64).

8. A dual level product conveyor line as defined in claim 5, wherein, The main conveying area (1) is provided with a plug inserting mechanism (5), the plug inserting mechanism (5) comprises a fixed seat (51), the top of the fixed seat (51) is provided with a lifting cylinder (52), the lifting end of the lifting cylinder (52) is provided with a supporting plate (54), and the supporting plate (54) is provided with an electric contact (55) at the position corresponding to the copper base (69).

9. A double deck product conveyor line according to claim 8, characterized in that The main conveying area (1) is provided with a limiting cylinder (53) and a photoelectric sensor (19) at the position corresponding to the left side of the supporting plate (54).

10. A dual level product conveyor line as defined in claim 1, wherein, The waiting area (2) is arranged between the main conveying area (1) and the material taking area (4), the waiting area (2) is provided with a rack (21), and the rack (21) is provided with a synchronous belt (25) at the position corresponding to the height of the two side synchronous belts of the main conveying area (1).

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