Multi-section conveying mechanism

Abstract

The utility model discloses a multi-section conveying mechanism. The multi-section conveying mechanism comprises a large bottom plate and a stacking conveying structure. The upper-layer conveying structure comprises an upper-layer mounting bottom plate, a first belt conveying assembly and a second belt conveying assembly; the middle-layer conveying structure comprises a middle-layer mounting plate, a middle-layer fixing plate, a guide wheel, a guide screw, an adjusting ring, a first guide rail, a first guide rod, a first roller mounting plate and a first synchronous belt idle wheel, and the first synchronous belt idle wheel is connected with the first roller mounting plate and serves as a power steering transition wheel for multi-section conveying; the lower-layer conveying structure comprises a lower-layer mounting bottom plate, a lower-layer fixing plate, a second roller mounting plate and a second synchronous belt idle wheel; the second synchronous belt idle wheel is connected with the second roller mounting plate and is used as a transition wheel for power steering of multi-section conveying; the stacked conveying structures are matched with one another to achieve the left-right extending and resetting functions, and the multi-section conveying mechanism is stable in conveying structure, continuous in action, high in efficiency and capable of being compatible with lead room conveying of PCBs of various specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of workpiece conveying, in particular to a multi-stage conveying mechanism. Background Art

[0002] With the development of inspection technology, more and more industry products need to be inspected for appearance or internal inspection. For example, PCB boards in the SMT industry have many sizes and specifications, and conveying mechanisms of different sizes are required to deliver PCB boards to specific inspection stations. For example, AOI inspection and XOI inspection are all online inspection equipment, which require the main body inspection to wait until the feeding conveying mechanism delivers the materials; due to the influence of X-ray (XOI inspection) equipment, lead room structure, shell and protective lead door structure, the gap between the upper and lower materials is large, which makes the feeding conveying mechanism unable to deliver PCB boards; only when the protective lead door is opened can the PCB board be delivered to a specific inspection station. For PCB boards with a specification of 50*50, they cannot be accurately delivered because there is a certain distance between the main body and the feeding conveying mechanism. There is a telescopic belt conveying mechanism in the industry, which partially extends out of the lead room structure to receive materials, occupies a large space and has a large equipment length. Therefore, a multi-stage conveying mechanism is proposed to realize multi-stage transmission, solve the transportation of small PCB boards and reduce the length of the main equipment. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model discloses a multi-stage conveying mechanism to solve the problems raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical solutions: a multi-stage conveying mechanism, comprising a large bottom plate and a superimposed conveying structure located at the upper end of the large bottom plate, wherein the superimposed conveying structure comprises an upper-middle-lower three-layer conveying structure;

[0005] The upper conveying structure includes an upper installation base plate, a first belt transmission assembly and a second belt transmission assembly, wherein the first belt transmission assembly is fixedly mounted on one side of the upper installation base plate, the second belt transmission assembly is located on the other side of the upper installation base plate, and the width of the second belt transmission assembly is manually adjusted on the upper installation base plate, a third synchronous belt idler is provided on the upper installation base plate, and the third synchronous belt idler is installed at the lower end of the upper installation base plate through a third roller mounting plate, as a transition wheel for power steering of multi-stage conveying;

[0006] The middle-level transmission structure includes a middle-level mounting plate, a middle-level fixed plate, a guide wheel, a guide screw, an adjustment ring, a first guide rail, a first guide rod, a first roller mounting plate and a first synchronous belt idler wheel, wherein the middle-level fixed plate is respectively mounted on both sides of the middle-level mounting plate, the guide wheel is mounted on the middle-level fixed plate by the guide screw, the adjustment ring is sleeved on the outer wall of the guide wheel, the guide wheel, the guide screw and the adjustment ring constitute a roller assembly, a plurality of roller assemblies are mounted on the middle-level fixed plate, the first guide rail is connected to both sides of the lower end of the upper-level mounting base plate, the first guide rod is located inside the first guide rail, a plurality of roller assemblies slide on the cylindrical first guide rod to realize the guiding function, the first roller mounting plate is mounted on the bottom of the middle-level mounting plate, the first synchronous belt idler wheel is connected to the first roller mounting plate, and serves as a transition wheel for power steering of multi-stage conveying;

[0007] The lower conveying structure includes a lower mounting base plate, a lower fixed plate, a second roller mounting plate and a second synchronous belt idler; and also includes a first guide rail, a first guide rod and a plurality of roller assemblies of the same structure as the middle conveying structure, the lower fixed plate is respectively mounted on both sides of the lower mounting base plate, a plurality of roller assemblies are mounted on the outer wall surface of the lower fixed plate, the first guide rail is connected to the lower end surface of the middle mounting plate, a plurality of roller assemblies slide in cooperation with the first guide rod mounted inside the first guide rail to achieve a guiding function, the second roller mounting plate is mounted on the lower mounting base plate, the second synchronous belt idler is connected to the second roller mounting plate, and serves as a transition wheel for power steering of multi-stage conveying;

[0008] The functions of extending to the left, resetting and extending to the right are realized by the cooperation between the superimposed conveying structures.

[0009] Preferably, the belt transmission assembly includes a first mounting plate, a transmission roller, a first screw, a belt support plate, a driving wheel, a stepper motor and a conveyor belt, the first mounting plates are respectively located on both sides of the upper mounting base plate, and several of the transmission rollers are respectively mounted on the inner wall of the first mounting plate by the first screws, the driving wheel is located on the inner side of the first mounting plate, the conveyor belt is sleeved on the transmission roller and the driving wheel, and the conveyor belt is supported by the belt support plate installed on the first mounting plate, and a gap of 2 mm is left between the belt support plate and the material clamping mechanism to ensure that the conveyor belt moves smoothly therebetween and the material flows smoothly, the conveyor belt does not jump, and moves in close contact with the belt support plate.

[0010] Preferably, width adjusting brackets are respectively provided on both sides of the second belt transmission assembly, which slide in the slide groove provided on the base plate through the width adjusting brackets and are locked by the knobs provided on the width adjusting brackets, and cooperate with the ruler provided on the base plate to facilitate width numerical adjustment, realize manual width adjustment, and are easy to operate.

[0011] Preferably, synchronous belt pressure plates are respectively provided at the lower ends of the upper mounting base plate and the lower mounting base plate for fixing the open synchronous belt, and a motor seat is provided at the lower end of the lower mounting base plate on one side, and a brake motor is provided on the motor seat, and the brake motor and the second synchronous belt idler wheel, the first synchronous belt idler wheel and the third synchronous belt idler wheel are linked to each other in sequence through belts, and are independently driven by the brake motor, and when the main body of the mechanism is powered off, there is a self-locking force to keep the superimposed transmission structure stationary in the original position when the power is off.

[0012] Preferably, a material clamping mechanism is provided at the upper end of the upper conveying structure, and the material clamping mechanism includes a first bracket, a fixed seat, a steering plate, a first pressure plate, a cylinder pad, a first cylinder, a roller connecting plate, a bearing guide rod, a first limit ring, a rolling bearing, a positioning pin and a spring. The first bracket is installed on the upper end of the upper mounting base plate close to the first belt transmission component side, the fixed seat is installed and fixed on the first bracket, the steering plate is rotatably connected to the fixed seat through a positioning shaft, the first pressure plate is located at the lower end of the steering plate, and the two are connected, the upper end of the positioning pin is connected to the lower end wall of the first pressure plate through a spring, and is connected through a positioning shaft. Under the cooperation of the pin guide and the spring, the up and down floating and resetting of the first pressure plate are realized. The first cylinder is installed on the upper end of the first bracket through the cylinder pad. The roller connecting plate is located at the front end of the first cylinder. The two ends of the bearing guide rod are rotatably connected with the two sides of the roller connecting plate. The rolling bearing is sleeved on the bearing guide rod and is limited by the first limiting rings on both sides. The bearing guide rod, the first limiting ring, and the rolling bearing constitute a rolling assembly. The first cylinder extends out with the rolling assembly, presses down the steering plate, and presses down the first pressure plate to realize the tightening function; the first cylinder retracts with the rolling assembly, and the steering plate is reset under the action of the spring, and the first pressure plate is lifted to realize the loosening function.

[0013] Preferably, a first sensor is provided at the end of the conveyor belt of the belt transmission assembly to sense the material, and a speed sensor and a position sensor are provided on the inner side of the first guide rail, respectively. The speed sensor is used to switch the conveyor belt between high and low speeds, and the position sensor is used to stop the belt conveyor line from rotating after the material is in place.

[0014] Preferably, a guide assembly is provided on the large base plate, and the guide assembly includes a second guide rail, a guide motor, a screw assembly, a coupling, a first bearing seat and a second bearing seat. The screw assembly is located on one side of the large base plate and is fixed to the large base plate by a first bearing seat and a second bearing seat provided at both ends of the screw assembly. One end of the screw assembly is connected to an output end of the guide motor through a coupling. The screw assembly is linked to the lower mounting base plate, and the lower mounting base plate and the large base plate are slidingly connected through the second guide rail. The overall mechanism follows the smooth movement between the lower mounting base plate and the large base plate, and is driven by the guide motor to realize the movement of the overall structure in the Y direction; the overall structure is ensured to be accurately docked with the feeding conveyor line through Y-direction translation and multi-segment transmission in the X direction.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. In the utility model, the multi-stage conveying mechanism is adopted, and the conveying structure is stable, the action is continuous, and the efficiency is high.

[0017] 2. The utility model can solve the lead room transportation problem of PCB boards of various specifications.

[0018] 3. In the utility model, sensors for deceleration and stopping at the right position are synchronously arranged on both sides of the conveyor line; in combination with the material clamping mechanism, the material can be clamped to prevent shaking and stringing during movement, and the double insurance ensures the accuracy of stopping the material at the right position.

[0019] 4. The utility model occupies a small space, the overall layout of the equipment is compact, and the overall structure can be moved in the Y direction; the overall structure is translated in the Y direction and multi-stage transmission in the X direction to ensure accurate docking with the feeding conveyor line. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0021] In the attached picture:

[0022] Figure 1 It is a schematic diagram of the overall structure of the multi-stage conveying mechanism of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the upper transmission structure of the utility model;

[0024] Figure 3 It is a schematic diagram of the structure of the new practical belt transmission component;

[0025] Figure 4It is a structural schematic diagram of the middle-layer transmission structure of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the lower layer transmission structure of the utility model;

[0027] Figure 6 It is a schematic diagram of the structure of the multi-stage conveying mechanism of the utility model after the whole is unfolded;

[0028] Figure 7 It is a structural schematic diagram of the material clamping mechanism of the utility model;

[0029] Figure 8 It is a front view of the lead room of the utility model;

[0030] Numbers in the figure: 1. Lead room; 101. Inlet and outlet; 11. Superposition transmission structure; 12. Material tightening mechanism; 13. Sensor system; 14. First bracket; 21. First belt transmission assembly; 22. Second belt transmission assembly; 23. Upper mounting base plate; 24. Knob; 25. Width adjustment bracket; 31. First mounting plate; 32. Transmission roller; 33. First screw; 34. Belt support plate; 35. Driving wheel; 36. Stepper motor; 37. Conveyor belt; 41. Middle mounting base plate; 42. Middle fixing plate; 43. Guide wheel; 44. Guide screw; 45. Adjustment ring; 46. First guide rail; 47. First guide rod; 48. First roller mounting plate; 49. First synchronous belt idler; 51. Lower mounting plate Mounting base plate; 52, lower fixed plate; 53, second roller mounting plate; 54, second synchronous belt idler; 61, synchronous belt pressure plate; 62, third roller mounting plate; 63, third synchronous belt idler; 66, brake motor; 67, motor seat; 68, first sensor; 69, speed sensor; 70, position sensor; 71, fixed seat; 72, steering plate; 73, first pressure plate; 74, cylinder pad; 75, first cylinder; 76, roller connecting plate; 77, bearing guide rod; 78, limit ring; 79, rolling bearing; 80, locating pin; 81, spring; 90, large base plate; 91, guide motor; 92, screw assembly; 93, coupling; 94, first bearing seat; 95, second bearing seat; 96, second guide rail. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] Example: Figure 1 and Figure 8As shown, a multi-stage conveying mechanism is located in the lead room 1 as a whole, including a large bottom plate 90 and a superimposed conveying structure 11 located on the upper end of the large bottom plate 90, and the superimposed conveying structure 11 includes an upper-middle-lower three-layer conveying structure;

[0033] like Figure 2 As shown, the upper conveying structure includes an upper installation base plate 23, a first belt transmission component 21 and a second belt transmission component 22, wherein the first belt transmission component 21 is fixedly mounted on one side of the upper installation base plate 23, the second belt transmission component 22 is located on the other side of the upper installation base plate 23, and the second belt transmission component 22 is manually adjusted in width on the upper installation base plate 23, and width adjustment brackets 25 are respectively provided on both sides of the second belt transmission component 22, and the width adjustment brackets 25 slide in the slide groove provided on the base plate, and are locked by the knobs 24 provided on the width adjustment brackets 25, and cooperate with the ruler provided on the base plate to facilitate width numerical adjustment, realize manual width adjustment, and convenient operation, a third synchronous belt idler wheel 63 is provided on the upper installation base plate 23, and the third synchronous belt idler wheel 63 is installed at the lower end of the upper installation base plate 23 through the third roller mounting plate 62, as a transition wheel for power steering of multi-stage conveying;

[0034] Among them, Figure 3 As shown, the belt transmission assembly includes a first mounting plate 31, a transmission roller 32 (flange), a first screw 33, a belt support plate 34, a driving wheel 35, a stepping motor 36 and a conveying belt 37. The first mounting plates 31 are respectively located on both sides of the upper mounting base plate 23, and a plurality of the transmission rollers 32 are respectively installed on the inner wall of the first mounting plate 31 by the first screws 33. The transmission roller 32 (flange) and the first screw 33 are combined as a transmission wheel structure, which is combined in the form of standard parts with low cost and good precision. The driving wheel 35 is located on the inner side of the first mounting plate 31, and the conveying belt 37 is sleeved on the transmission roller 32 and the driving wheel 35. The conveying belt 37 is supported by the belt support plate 34 installed on the first mounting plate 31, and a gap of 2 mm is left between the belt support plate 34 and the material clamping mechanism 12 to ensure that the conveying belt 37 moves smoothly therebetween and the material flows smoothly. The conveying belt 37 does not jump and moves in close contact with the belt support plate 34.

[0035] Among them, Figure 7As shown, a material clamping mechanism 12 is provided at the upper end of the upper conveying structure, and the material clamping mechanism 12 includes a first bracket 14, a fixed seat 71, a steering plate 72, a first pressure plate 73, a cylinder pad 74, a first cylinder 75, a roller connecting plate 76, a bearing guide rod 77, a first limit ring 78, a rolling bearing 79, a positioning pin 80 and a spring 81. The first bracket 14 is installed on the upper end of the upper mounting base plate 23 near the first belt transmission component 21 side, the fixed seat 71 is installed and fixed on the first bracket 14, the steering plate 72 is rotatably connected to the fixed seat 71 through a positioning shaft, so that the steering plate 72 swings up and down and turns, the first pressure plate 73 is located at the lower end of the steering plate 72, and the two are connected, and the upper end of the positioning pin 80 is connected to the lower end wall of the first pressure plate 73 through a spring 81. The first pressure plate 73 is connected, and the first pressure plate 73 is floated up and down and reset by the guidance of the positioning pin 80 and the cooperation of the spring 81. The first cylinder 75 is installed on the upper end of the first bracket 14 through the cylinder pad 74. The roller connecting plate 76 is located at the front end of the first cylinder 75. The two ends of the bearing guide rod 77 are rotatably connected to the two sides of the roller connecting plate 76. The rolling bearing 79 is sleeved on the bearing guide rod 77 and is limited by the first limiting rings 78 on both sides. The bearing guide rod 77, the first limiting ring 78, and the rolling bearing 79 constitute a rolling assembly. The first cylinder 75 extends out with the rolling assembly, presses down the steering plate 72, and the first pressure plate 73 is pressed down to realize the tightening function; the first cylinder 75 retracts with the rolling assembly, the steering plate 72 is reset under the action of the spring 81, and the first pressure plate 73 is lifted to realize the loosening function.

[0036] like Figure 4 As shown, the middle-layer transmission structure includes a middle-layer mounting plate, a middle-layer fixed plate 42, a guide wheel 43, a guide screw 44, an adjustment ring 45, a first guide rail 46, a first guide rod 47, a first roller mounting plate 48 and a first synchronous belt idler wheel 49. The middle-layer fixed plate 42 is respectively mounted on both sides of the middle-layer mounting plate, and the guide wheel 43 is mounted on the middle-layer fixed plate 42 by the guide screw 44. The adjustment ring 45 is sleeved on the outer wall of the guide wheel 43. The guide wheel 43, the guide screw 44 and the adjustment ring 45 constitute a roller assembly. A plurality of roller assemblies are mounted on the middle-layer fixed plate 42. The first guide rail 46 is connected to both sides of the lower end of the upper-layer mounting base plate 23. The first guide rod 47 is located inside the first guide rail 46. A plurality of roller assemblies slide on the cylindrical first guide rod 47 to realize the guiding function. The first roller mounting plate 48 is mounted on the bottom of the middle-layer mounting plate. The first synchronous belt idler wheel 49 is connected to the first roller mounting plate 48 as a transition wheel for power steering of multi-stage conveying.

[0037] like Figure 4 and Figure 5As shown, the lower conveying structure includes a lower mounting base plate 51, a lower fixed plate 52, a second roller mounting plate 53 and a second synchronous belt idler wheel 54; it also includes a first guide rail 46, a first guide rod 47 and a plurality of roller assemblies of the same structure as the middle conveying structure, the lower fixed plate 52 is respectively mounted on both sides of the lower mounting base plate 51, a plurality of roller assemblies are mounted on the outer wall surface of the lower fixed plate 52, the first guide rail 46 is connected to the lower end surface of the middle mounting plate, a plurality of roller assemblies slide in cooperation with the first guide rod 47 mounted inside the first guide rail 46 to achieve a guiding function, the second roller mounting plate 53 is mounted on the lower mounting base plate 51, the second synchronous belt idler wheel 54 is connected to the second roller mounting plate 53, and serves as a transition wheel for power steering of multi-stage conveying;

[0038] like Figure 6 As shown, a synchronous belt pressure plate 61 is respectively provided at the lower end of the upper mounting base plate 23 and the lower mounting base plate 51 for fixing the open synchronous belt, and a motor seat 67 is provided at the lower end of the lower mounting base plate 51 on one side, and a brake motor 66 is provided on the motor seat 67. The brake motor 66 and the second synchronous belt idler wheel 54, the first synchronous belt idler wheel 49 and the third synchronous belt idler wheel 63 are linked to each other through belts in sequence, and are independently driven by the brake motor 66. When the main body of the mechanism is powered off, there is a self-locking force to keep the superimposed conveying structure stationary in the original position when the power is off; finally, the superimposed conveying structures 11 cooperate with each other and are driven and controlled by the brake motor 66 at the lower end to realize the functions of extending to the left, resetting and extending to the right.

[0039] Furthermore, a first sensor 68 is provided at the end of the conveyor belt 37 of the belt transmission assembly to sense the material, and a speed sensor 69 and a position sensor 70 are provided on the inner side of the first guide rail 46. The speed sensor 69 is used to realize high and low speed switching of the conveyor belt 37, and the position sensor 70 is used to stop the belt conveyor line from rotating after the material is in place. The above sensors constitute the sensing system 13 auxiliary mechanism for feeding.

[0040] Furthermore, a guide assembly is provided on the large base plate 90, and the guide assembly includes a second guide rail 96, a guide motor 91, a screw assembly 92, a coupling 93, a first bearing seat 94 and a second bearing seat 95. The screw assembly 92 is located on one side of the large base plate 90, and is fixed to the large base plate 90 by a first bearing seat 94 and a second bearing seat 95 provided at both ends of the screw assembly 92. One end of the screw assembly 92 is connected to an output end of a guide motor 91 through a coupling 93. The screw assembly 92 is linked to the lower mounting base plate 51, and the lower mounting base plate 51 and the large base plate 90 are slidingly connected through a second guide rail 96. The overall mechanism follows the smooth movement between the lower mounting base plate 51 and the large base plate 90, and is driven by the guide motor 91 to realize the movement of the overall structure in the Y direction; the overall structure is ensured to be accurately docked with the feeding conveyor line through Y-direction translation and multi-segment transmission in the X direction.

[0041] Working principle:

[0042] When the parts conveyed by the feeding conveyor line are in place, the main body of the equipment receives a signal, opens the protective door of the lead room 1, and the multi-stage conveying mechanism opens the brake by controlling the brake motor 66 and rotates forward. The upper-middle-lower three-layer superimposed conveying structure 11 runs and extends from the inlet and outlet 101 to the outside of the lead room 1 and docks the feeding conveyor line. The guide motor 91 of the belt line installed on the large bottom plate 90 moves to dock the material. The material runs to the belt line. The stepper motor 36 in the process of the belt transmission component drives the conveyor belt 37 to move the material, and senses it through the speed sensor 69. The belt line slows down and moves until the position sensor senses and stops; the first cylinder 75 of the material clamping mechanism 12 extends out, presses the material through the first pressure plate 73, and controls the brake motor 66 again to rotate in the opposite direction. The upper-middle-lower three-layer superimposed conveying structure 11 runs, retracts to the inside of the lead room 1, returns to the original position, completes the conveyor line action, and detects the inside of the PCB board body.

[0043] Finally, it should be noted that the above description is only a preferred example of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-stage conveying mechanism, characterized in that: It includes a large bottom plate and a superimposed conveying structure located at the upper end of the large bottom plate, wherein the superimposed conveying structure includes an upper-middle-lower three-layer conveying structure; The upper conveying structure includes an upper installation base plate, a first belt transmission assembly and a second belt transmission assembly, wherein the first belt transmission assembly is fixedly mounted on one side of the upper installation base plate, the second belt transmission assembly is located on the other side of the upper installation base plate, and the width of the second belt transmission assembly is manually adjusted on the upper installation base plate, a third synchronous belt idler is provided on the upper installation base plate, and the third synchronous belt idler is installed at the lower end of the upper installation base plate through a third roller mounting plate, as a transition wheel for power steering of multi-stage conveying; The middle-level transmission structure includes a middle-level mounting plate, a middle-level fixed plate, a guide wheel, a guide screw, an adjustment ring, a first guide rail, a first guide rod, a first roller mounting plate and a first synchronous belt idler wheel. The middle-level fixed plate is respectively mounted on both sides of the middle-level mounting plate, the guide wheel is mounted on the middle-level fixed plate by the guide screw, the adjustment ring is sleeved on the outer wall of the guide wheel, the guide wheel, the guide screw and the adjustment ring constitute a roller assembly, a plurality of roller assemblies are mounted on the middle-level fixed plate, the first guide rail is connected to both sides of the lower end of the upper-level mounting base plate, the first guide rod is located inside the first guide rail, a plurality of roller assemblies slide on the cylindrical first guide rod, the first roller mounting plate is mounted on the bottom of the middle-level mounting plate, the first synchronous belt idler wheel is connected to the first roller mounting plate, and serves as a transition wheel for power steering of multi-stage conveying; The lower conveying structure includes a lower mounting base plate, a lower fixed plate, a second roller mounting plate and a second synchronous belt idler; and also includes a first guide rail, a first guide rod and a plurality of roller assemblies of the same structure as the middle conveying structure, the lower fixed plate is respectively mounted on both sides of the lower mounting base plate, a plurality of roller assemblies are mounted on the outer wall surface of the lower fixed plate, the first guide rail is connected to the lower end surface of the middle mounting plate, a plurality of roller assemblies slide in cooperation with the first guide rod mounted inside the first guide rail, the second roller mounting plate is mounted on the lower mounting base plate, the second synchronous belt idler is connected to the second roller mounting plate and serves as a transition wheel for power steering of multi-stage conveying; The functions of extending to the left, resetting and extending to the right are realized by the cooperation between the superimposed conveying structures.

2. A multi-stage conveying mechanism according to claim 1, characterized in that: The belt transmission assembly includes a first mounting plate, a transmission roller, a first screw, a belt support plate, a driving wheel, a stepper motor and a conveying belt. The first mounting plates are respectively located on both sides of the upper mounting base plate. Several of the transmission rollers are respectively installed on the inner wall of the first mounting plate by the first screws. The driving wheel is located on the inner side of the first mounting plate. The conveying belt is sleeved on the transmission roller and the driving wheel, and the conveying belt is supported by the belt support plate installed on the first mounting plate.

3. A multi-stage conveying mechanism according to claim 2, characterized in that: Width-adjusting brackets are respectively provided on both sides of the second belt transmission component. The width-adjusting brackets slide in the slide grooves provided on the bottom plate and are locked by knobs provided on the width-adjusting brackets, in cooperation with a ruler provided on the bottom plate.

4. A multi-stage conveying mechanism according to claim 3, characterized in that: The lower ends of the upper mounting base plate and the lower mounting base plate are respectively provided with synchronous belt pressure plates for fixing the open synchronous belt, and the lower end of the lower mounting base plate on one side is provided with a motor seat, and the motor seat is provided with a brake motor, and the brake motor and the second synchronous belt idler wheel, the first synchronous belt idler wheel and the third synchronous belt idler wheel are sequentially linked to each other through belts.

5. A multi-stage conveying mechanism according to claim 1, characterized in that: A material clamping mechanism is provided at the upper end of the upper conveying structure, and the material clamping mechanism comprises a first bracket, a fixed seat, a steering plate, a first pressure plate, a cylinder pad, a first cylinder, a roller connecting plate, a bearing guide rod, a first limiting ring, a rolling bearing, a positioning pin and a spring. The first bracket is installed at the upper end of the upper mounting base plate near the first belt transmission component side, the fixed seat is installed and fixed on the first bracket, the steering plate is rotatably connected to the fixed seat through a positioning shaft, the first pressure plate is located at the lower end of the steering plate, and the two are connected, the upper end of the positioning pin is connected to the lower end wall of the first pressure plate through a spring, and the first pressure plate is floated up and down and reset under the guidance of the positioning pin and the cooperation of the spring, the first cylinder is installed at the upper end of the first bracket through a cylinder pad, the roller connecting plate is located at the front end of the first cylinder, the two ends of the bearing guide rod are rotatably connected to the two sides of the roller connecting plate, the rolling bearing is sleeved on the bearing guide rod, and is limited by the first limiting rings on both sides.

6. A multi-stage conveying mechanism according to claim 5, characterized in that: A first sensor is provided at the end of the conveyor belt of the belt transmission assembly to sense the material. A speed sensor and a position sensor are provided on the inner side of the first guide rail. The speed sensor is used to switch the conveyor belt between high and low speeds. The position sensor is used to stop the belt conveyor line from rotating after the material is in place.

7. A multi-stage conveying mechanism according to claim 1, characterized in that: A guide assembly is provided on the large base plate, and the guide assembly includes a second guide rail, a guide motor, a screw assembly, a coupling, a first bearing seat and a second bearing seat. The screw assembly is located on one side of the large base plate and is fixed to the large base plate by the first bearing seat and the second bearing seat provided at both ends of the screw assembly. One end of the screw assembly is connected to the output end of the guide motor through a coupling. The screw assembly is linked to the lower mounting base plate. The lower mounting base plate and the large base plate are slidingly connected through the second guide rail. The overall mechanism follows the smooth movement between the lower mounting base plate and the large base plate, and is driven by the guide motor to realize the movement of the overall structure in the Y direction. The overall structure is ensured to be accurately connected with the feeding conveyor line through Y-direction translation and multi-segment transmission in the X direction.

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