Automatic feeding equipment for stacking pallets of printer

Abstract

Automatic feeding equipment for stacking pallets of a printer comprises a rack, a bottom conveying module, a left lifting module, a right lifting module, a middle lifting module and a chain transmission module, and the bottom conveying module is responsible for conveying a pallet containing area on the bottommost layer on the bottom conveying module to a conveying area; the middle lifting module is connected with the left side lifting module and the right side lifting module through the chain transmission module. The left lifting module and the right lifting module are located on the two sides of the pallet containing area of the bottom conveying module correspondingly and used for clamping pallets on the second layer or above, and under driving of the middle lifting module, the pallets are lifted or the lifted pallets are placed in the pallet containing area of the bottom conveying module. The automatic feeding device is simple in structure, automatic feeding of pallet stacks is achieved, the pallet feeding efficiency is improved, and the labor cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of automation equipment, specifically referring to an automatic palletizing and feeding device for printers. Background Technology

[0002] Currently, the manual operation of pallet loading is quite cumbersome. The specific steps are: a forklift is used to manually pull a load of pallets to the roller conveyor, then one pallet is placed on the roller conveyor, and after the first pallet is conveyed to the next station, the remaining pallets are placed in sequence. This loading process has problems such as requiring manual labor to be constantly at the roller conveyor, high loading safety risks, and low loading efficiency. To solve these problems, this equipment was developed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an automatic palletizing device for printers, which can automatically feed palletizing devices and solve the problems of needing manual feeding at the line, high safety risks, and low feeding efficiency.

[0004] To solve the above technical problems, the present invention provides an automatic palletizing device for printers, characterized in that it includes a frame, a bottom conveyor module, a left lifting module, a right lifting module, a middle lifting module, and a chain drive module, wherein: the frame is placed above the bottom conveyor module, and the left lifting module, the right lifting module, and the middle lifting module are respectively arranged on the frame and are capable of vertical linear displacement along the frame; the left lifting module and the right lifting module are respectively located on the left and right sides of the frame and on the outer sides of the bottom conveyor module in the width direction, and the middle lifting module straddles the bottom conveyor module; the middle lifting module is connected to the left and right lifting modules respectively through the chain drive module. The lifting module and the right lifting module are connected and fixed. The middle lifting module drives the left and right lifting modules to move vertically along the frame. The left and right lifting modules are used to clamp the second and subsequent pallets of the stacked pallets placed on the bottom conveying module. Driven by the middle lifting module, the pallets are lifted or placed on the bottom conveying module. The bottom conveying module is divided into a pallet placement area and a conveying area along the conveying direction. After the left and right lifting modules lift the second and subsequent pallets, the bottom conveying module conveys the bottom pallet of the stack in the pallet placement area from the pallet placement area to the conveying area.

[0005] Preferably, the bottom conveying module includes rollers arranged parallel to each other at intervals along the conveying direction. The rollers between the pallet placement area and the conveying area are powered rollers that can be driven to rotate by a motor. The powered rollers are connected to the rollers in the pallet placement area via chains. The rollers in the conveying area are non-powered rollers. The powered rollers drive the rollers in the pallet placement area to rotate, conveying the pallet from the pallet placement area to the conveying area.

[0006] Preferably, the pallet placement area of ​​the bottom conveyor module includes three sets of parallel roller conveyor belts spaced apart. One end of each roller on both sides of the roller conveyor belt is connected to the other by a chain and connected to the power roller by the chain.

[0007] Preferably, photoelectric sensors for sensing the pallet are respectively provided on the two opposite outer sides of the transmission area.

[0008] Preferably, the left lifting module and the right lifting module each include a pull plate that can be linearly displaced vertically to be mounted on the frame. The pull plate is connected to the middle lifting module via the chain drive module. Lifting blocks that extend and retract toward a pallet placed on the bottom conveyor module are respectively provided at both ends of the pull plate. The lifting blocks can extend into the pallet. With the cooperation of the middle lifting module and the chain drive module, the left lifting module and the right lifting module lift and lower the pallet.

[0009] Preferably, vertical slide rails are respectively provided on the left and right sides of the frame, and the pull plate is slidably mounted on the vertical slide rails; horizontal slide rails and telescopic cylinders are respectively provided at both ends below the pull plate, the lifting block is slidably mounted on the horizontal slide rails, the telescopic cylinder is connected to the lifting block, and the telescopic cylinder drives the lifting block to extend and retract along the horizontal slide rails toward the pallet.

[0010] Preferably, two photoelectric sensors are provided on each of the telescopic cylinders.

[0011] Preferably, a set of photoelectric sensors is provided on both sides of the left lifting module and the right lifting module along the conveying direction of the bottom conveying module, and each set of photoelectric sensors has three photoelectric sensors spaced apart from bottom to top.

[0012] Preferably, the intermediate lifting module includes a pull plate that can move vertically and linearly on the frame, and a lifting cylinder is provided on the frame and connected to the pull plate; the chain drive module includes two chains, and each end of the pull plate is connected to the pull plates of the left lifting module and the right lifting module through one chain of the chain drive module, respectively. The lifting cylinder drives the pull plate to move vertically and linearly along the frame, thereby causing the left lifting module and the right lifting module to rise or fall as a whole.

[0013] Preferably, a drive shaft is provided on the top of the frame above the intermediate lifting module, and gears are respectively provided at both ends of the drive shaft. Gears are respectively provided on the top of the frame on the left and right lifting modules. The two chains of the chain drive module are respectively wound around the gears.

[0014] The automatic palletizing equipment for printers of the present invention has a simple structure and can automatically feed palletizing equipment, thereby improving pallet feeding efficiency and reducing manual labor intensity and cost. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of an automatic palletizing and feeding device for printers.

[0016] Figure 2 This is a schematic diagram of the main structure of an automatic palletizing and feeding equipment for printers.

[0017] Figure 3 This is a schematic diagram of the frame structure.

[0018] Figure 4 This is a structural diagram of the frame from another angle.

[0019] Figure 5 This is a schematic diagram of the bottom conveyor module structure.

[0020] Figure 6 This is a schematic diagram of the left-side lifting module from the front.

[0021] Figure 7 This is a rear view schematic diagram of the left-side lifting module structure.

[0022] Figure 8 This is a schematic diagram of the intermediate lifting module structure.

[0023] Figure 9 This is a schematic diagram of the chain drive module structure.

[0024] Figure Labels

[0025] Frame 1, Bottom Conveyor Module 2, Left Lifting Module 3, Right Lifting Module 4, Middle Lifting Module 5, Chain Drive Module 6, Left Fixing Plate 7, Left Connecting Plate 8, L-Shaped Connecting Plate 9, Gear Chain Shaft 10, Left Gear 11, Thrust Bearing Seat 12, Snap Ring 13, Bushing 14, Left Gear 15, Rotating Shaft 16, Middle Rear Fixing Plate 17, Right Gear 18, Bushing 19, Thrust Bearing Seat 20, Snap Ring 21, L-Shaped Connecting Plate 23, Right Connecting Plate 24, Gear Chain Shaft 25, Right Gear 26, Right Fixing Plate 27, Left Rear Fixing Plate 30, Right Front Fixing Plate 40, Right Rear Fixing Plate 36, Photoelectric Sensors (28, 29, 31, 32, 33, 35, 37, 38, 39, 41, 42, 43) ), connecting sheet metal 44, roller gear 45, left chain 46, left roller 47, left mounting base 48, middle roller 49, non-powered roller 49a, middle mounting base 50, right roller 51, roller gear 52, right chain 53, right mounting base 54, right sensor 55, power roller input connector 56, left sensor 57, power roller 58, left rear connecting plate 59, right rear connecting plate 60, pull plate fixing block 61, pull plate 62, vertical slide rail 63, horizontal slide rail mounting base 64, reinforcing rib 65, upper slider 67, lower slider 68, lifting block 69, telescopic cylinder 70, vertical slide rail 80, pull plate 81, electric cylinder 82, pull plate fixing block 83, pull plate fixing block 84, chain 90, chain 91. Detailed Implementation

[0026] Regarding the above technical solutions, preferred embodiments are now described in detail with reference to the figures, including an automatic palletizing device for printers. Figures 1 to 2 It includes a frame 1, a bottom conveyor module 2, a left lifting module 3, a right lifting module 4, a middle lifting module 5, and a chain drive module 6.

[0027] Rack 1, see Figures 3 to 4 The frame 1 includes right and left side frames positioned opposite each other and a middle frame connecting the right and left side frames. The bottom conveyor module 2 is located below the frame 1. The right and left side frames of the frame 1 are respectively located above the two outer sides of the bottom conveyor module 2. The middle frame of the frame 1 spans directly above the bottom conveyor module 2 and is located near the center of the bottom conveyor module 2 along its length. A gap is maintained between the lower section of the middle frame of the frame 1 and the conveying surface of the bottom conveyor module 2, allowing a pallet to pass through.

[0028] The frame 1 mainly includes: a vertical left fixed plate 7 and a right fixed plate 27 fixedly installed at the center positions of the left and right side frames along the conveying direction of the bottom conveying module 2, respectively; and a vertical middle rear fixed plate 17 fixedly installed on the middle frame. A left connecting plate 8 is fixedly installed on the top of the frame 1 above the left fixed plate 7 of the left side frame. An L-shaped connecting plate 9 is fixedly connected to the left connecting plate 8. A rotatable gear chain shaft 10 is fixedly installed on the L-shaped connecting plate 9. A left gear 11 is fixedly installed on the gear chain shaft 10. A right connecting plate 24 is fixedly installed on the top of the frame 1 above the right fixed plate 27 of the right side frame. An L-shaped connecting plate 23 is fixedly connected to the right connecting plate 24. A rotatable gear chain shaft 25 is fixedly installed on the L-shaped connecting plate 23. A right gear 26 is fixedly installed on the gear chain shaft 25. Thrust bearing housing 12 and thrust bearing housing 20 are respectively provided at both ends of the top of the intermediate frame. Thrust bearing housing 12 is provided with snap ring 13 and bushing 14, and thrust bearing housing 20 is provided with snap ring 21 and bushing 19. The two ends of the rotating shaft 16 are provided on the thrust bearing housing 12 and thrust bearing housing 20 through bushings (14, 19). A left gear 15 and a right gear 18 are respectively provided at both ends of the rotating shaft 16.

[0029] The left lifting module 3 and the right lifting module 4 are respectively mounted on the left and right frames of the frame 1, which are spaced apart and opposite to each other. The middle lifting module 5 is located on the middle frame of the frame 1. The left lifting module 3 and the right lifting module 4 are positioned opposite each other, and the middle lifting module 5 is used to lift the left lifting module 3 and the right lifting module 4, respectively.

[0030] A set of photoelectric sensors 7 is installed on the left frame of the frame 1 on both sides of the left lifting module 3. The photoelectric sensors 7 are respectively installed on the left rear fixed plate 30 and the left front fixed plate 33. A set of photoelectric sensors 7 is also installed on the right frame of the frame 1 on both sides of the right lifting module 4. The photoelectric sensors 7 are respectively installed on the right front fixed plate 40 and the right rear fixed plate 36. The photoelectric sensors 7 installed on the right and left frames of the frame 1 are arranged facing each other. Each set of photoelectric sensors 7 includes three sensors arranged vertically at intervals. The set of photoelectric sensors 7 on the right frame away from the middle frame has photoelectric sensors (32, 33, 35) arranged from top to bottom, and the set of photoelectric sensors 7 near the middle frame has photoelectric sensors (28, 29, 31) arranged from top to bottom. Similarly, the set of photoelectric sensors 7 on the left frame away from the middle frame has photoelectric sensors (37, 38, 39) arranged from top to bottom, and the set of photoelectric sensors 7 near the middle frame has photoelectric sensors (41, 42, 43) arranged from top to bottom.

[0031] Bottom conveyor module 2, see Figure 5The main body is installed directly below the frame 1, and mainly includes parallel and spaced connecting sheet metal 44, roller gear 45, left chain 46, left roller 47, left mounting base 48, middle roller 49, non-powered roller 49a, middle mounting base 50, right roller 51, roller gear 52, right chain 53, right mounting base 54, right sensor 55, power roller input connector 56, left sensor 57, power roller 58, left rear connecting plate 59, and right rear connecting plate 60. Among them:

[0032] Parallel sheet metal 44s are provided on the left and right sides as supporting connectors for the bottom conveying module 2. A power roller 58 is rotatably connected between the left and right connecting sheet metal 44s. The power roller 58 is located near the middle frame facing the left and right frames. The power roller 58 is connected to a motor (not shown) via a power roller input connector 56 to drive its rotation. A left rear connecting plate 59 and a right rear connecting plate 60 are provided on the side of the power roller 58 facing the left and right frames. A left mounting base 48, a middle mounting base 50, and a right mounting base 54 are respectively connected and fixed between the left rear connecting plate 59 and the right rear connecting plate 60 between the left and right connecting sheet metal 44s. Several left rollers 47, middle rollers 49, and right rollers 51 are arranged parallel to each other on the left mounting base 48, middle mounting base 50, and right mounting base 54. Each left-side roller 47 has a roller gear 45 near the connecting sheet metal 44. A left-side chain 46 is mounted on the roller gear 45, connecting the left-side rollers 47. Each right-side roller 51 has a roller gear 52 near the connecting sheet metal 44. A right-side chain 53 is mounted on the roller gear 52, connecting the right-side rollers 51. Each right-side roller 51 is connected to each other and to a chain of a power roller 58. Rotation of the power roller 58 drives the left-side rollers 47 and right-side rollers 51 to rotate simultaneously in the same direction. A rotatable non-powered roller 49a is connected to the connecting sheet metal 44 on the other side of the power roller 58. When a pallet is placed on the left roller 47, the middle roller 49, and the right roller 51, the rotation of the power roller 58 drives the left roller 47 and the right roller 51 to rotate simultaneously, causing the pallet to move along the rollers and transport the pallet from the left roller 47 and the right roller 51 to the non-power roller 49a. A left sensor 57 and a right sensor 55 are respectively installed at opposite positions on the outer sides of the left connecting sheet metal 44 and the right connecting sheet metal 44.

[0033] The bottom conveying module 2 is divided into two areas by a powered roller 58. One area is a pallet placement area formed by the left roller 47, the middle roller 49, and the right roller 51. The other area is a conveying area formed by several non-powered rollers 49a, which transports the pallet to the next process. The powered roller 58 drives the left roller 47, the middle roller 49, and the right roller 51 to rotate together, thus conveying the pallet from the pallet placement area to the conveying area.

[0034] Its operating principle:

[0035] A forklift pallet is manually pushed into frame 1. The left side of the forklift is positioned between the left mounting seat 48 and the middle mounting seat 50 of the bottom module, and the right side of the forklift is positioned between the right mounting seat 54 and the middle mounting seat 50 of the bottom module. The pallet is placed on the left roller 47, the middle roller 49, and the right roller 51. After the pallet is pushed into place, the forklift pulls it out. Photoelectric sensors (31, 35, 39, 43) all sense the pallet and trigger the left lifting module 3, the right lifting module 4, and the middle lifting module 5 to move simultaneously. When the left lifting module 3, the right lifting module 4, and the middle lifting module 5 have lifted all the pallets above the second row, and there is only one pallet remaining on the left roller 47, the middle roller 49, and the right roller 51, the photoelectric sensor (29, 43)... In response to the signals 33, 38, and 42, the power roller 59 is triggered to rotate clockwise. The power roller 59 drives the left roller 47 and the right roller 51 to rotate clockwise via a chain, conveying the single pallet located on the left roller 47, the middle roller 49, and the right roller 54 to the non-power roller 49a. When the front end of the pallet is conveyed to the left sensor 57 and the right sensor 55, the subsequent assembly line station movement is triggered, and then the pallet is conveyed backward. When the pallet has passed the power roller 59, the sensors (31, 35, 39, and 43) respond, triggering the left lifting module 3, the right lifting module 4, and the middle lifting module 5 to move, lowering the lifted pallet onto the left roller 47, the middle roller 49, and the right roller 54, thus completing the bottom conveying process of the pallet.

[0036] The left lifting module 3 and the right lifting module 4 have the same structure. The structure will be explained using the left lifting module 3 as an example. (See attached image.) Figures 6 to 7 It mainly includes a pull plate fixing block 61, a pull plate 62, a vertical slide rail 63, a horizontal slide rail mounting base 64, a reinforcing rib 65, a horizontal linear slide rail, an upper slider 67, a lower slider 68, a lifting block 69, a telescopic cylinder 70, and two photoelectric sensors are respectively set on the telescopic cylinder 70.

[0037] A vertical slide rail 63 is installed on the left fixed plate 7. An upper slider 67 and a lower slider 68 are provided on the vertical slide rail 63. A pull plate 62 is fixedly connected to the upper slider 67 and the lower slider 68, allowing the pull plate 62 to move vertically up and down along the vertical slide rail 63. Limit buffers are provided at the top and bottom of the left fixed plate 7 to limit the vertical displacement of the pull plate 62. Horizontal slide rail mounting seats 64 are fixedly connected to the front and rear ends of the lower end face of the pull plate 62, respectively. The horizontal slide rail mounting seats 64 and the pull plate 62 are fixed together by reinforcing ribs 65 to enhance mechanical strength. A horizontal linear slide rail is provided below the horizontal slide rail mounting seats 64. A slider is provided on the horizontal linear slide rail. A lifting block 69 is fixedly connected to the slider. A telescopic cylinder 70 is provided on one side of the lifting block 69. The telescopic cylinder 70 is installed below the horizontal slide rail mounting seats 64. The telescopic rod of the telescopic cylinder 70 is connected to the lifting block 69. Driven by the telescopic cylinder 70, the lifting block 69 is driven to extend and retract horizontally relative to the pallet. A pull plate fixing block 61 is set on the pull plate 62. The pull plate fixing block 61 is connected to the intermediate lifting module 5 through the chain drive module 6. The left lifting module 3 is raised or lowered through the chain drive module 6 and the intermediate lifting module 5.

[0038] Its operating principle is as follows:

[0039] When the pallet is placed on the right roller 47, middle roller 49, and left roller 54 of the bottom conveyor module 2, sensors (31, 35, 39, 43) trigger the telescopic cylinders 70 on the left lifting module 3 and the right lifting module 4. The telescopic cylinders 70, along with the lifting blocks 69 on the left and right lifting modules 3 and 4, extend towards the pallet, reaching into the second-layer pallet support opening from the left and right sides of the pallet. Once in place, one of the photoelectric sensors on the telescopic cylinder 70 triggers the electric cylinder 127 of the middle lifting module 5, causing the pull plate 142 of the middle lifting module 5 to move downwards. This, through the chain of the chain drive module 6, pulls the pull plates 62 on the left and right lifting modules 3 and 4 upwards along the vertical slide rail 63, thereby lifting the pallets above the second layer upwards, waiting for the bottom conveyor module 2 to transport the bottommost single pallet backwards. When the pallet is positioned, photoelectric sensors (55, 57) trigger the electric cylinder 127 of the intermediate lifting module 5 to move, causing the pull plate 142 of the intermediate lifting module 5 to return to its original position. Through the chain of the chain transmission module 6, the pull plate 62 moves downward along the vertical slide rail 63, causing the pallet to fall onto the right roller 47, the middle roller 49, and the left roller 54 of the bottom conveying module 2. Then, photoelectric sensors (31, 35, 39, 43) trigger the telescopic cylinder 70 to move again, causing the telescopic cylinder 70 to retract, taking the lifting block 69 back to its original position from the pallet support opening. After retracting, another photoelectric sensor at the telescopic cylinder 70 responds, triggering the electric cylinder 127 of the intermediate lifting module 5 to move, lifting the lifting blocks of the left lifting module 3 and the right lifting module 4 to their initial positions, corresponding to the second pallet. The above lifting and conveying steps are repeated, and the grabbing and lifting process is completed.

[0040] Intermediate lifting module 5, see Figure 8 The main body is mounted on the middle and rear fixed plate 17 of the frame 1. A vertical slide rail 80 is fixedly installed on the middle and rear fixed plate 17. The pull plate 81 is set on the vertical slide rail 80 through the connected upper and lower sliders. Limiting buffers are set at the upper and lower ends of the middle and rear fixed plate 17 to limit the vertical linear displacement of the pull plate 81 along the vertical slide rail 80. An electric cylinder 82 is fixedly installed on the middle frame of the frame 1. The telescopic rod of the electric cylinder 82 is fixedly connected to the pull plate fixing block 83 on the pull plate 81. Driven by the electric cylinder 82, the pull plate 81 moves vertically up and down along the vertical slide rail 80. Two pull plate fixing blocks 84 are spaced apart on the pull plates 81 on opposite sides of the pull plate fixing blocks 83 connected to the electric cylinder 82. The chain transmission module 6 is connected to the pull plate fixing blocks 84 respectively.

[0041] Chain drive module 6, see Figure 9The system includes two chains (90 and 91). One chain 90 is mounted on the left gear 11 on the left side frame of the frame 1 and on the left gear 15 near the left side frame of the drive shaft 16 at the top of the frame 1. One end of chain 90 is connected and fixed to the pull plate 62 of the left lifting module 3, and the other end is connected and fixed to the pull plate fixing block 84 near the left side frame of the middle lifting module 5. The other chain 91 is mounted on the right gear 26 on the right side frame of the frame 1 and on the right gear 18 near the right side frame of the drive shaft 16 at the top of the frame 1. One end of chain 91 is connected and fixed to the pull plate of the right lifting module 4, and the other end is connected and fixed to the pull plate fixing block 84 near the right side frame of the middle lifting module 5. The extension and retraction of the electric cylinder 82 of the middle lifting module 5 controls the raising and lowering of the pull plate 81 of the middle lifting module 5, thereby controlling the synchronous raising or lowering of the left lifting module 3 and the right lifting module 4 through the chain drive module 6 connected thereto.

[0042] The workflow of this invention:

[0043] Turn on the power switch and press the operation screen or start button. Manually push a forklift pallet into frame 1, aligning the right side of the forklift with the middle of the right mounting seat 48 and the middle mounting seat 50 of the bottom module, and the left side of the forklift with the middle of the left mounting seat 54 and the middle mounting seat 50 of the bottom module. After the pallet is pushed into place, it is lowered onto the right roller 47, the middle roller 49, and the left roller 54. The forklift pulls out, and the sensors (31, 35, 39, 43) trigger the telescopic cylinders 70 of the left lifting module 3 and the right lifting module 4, causing the lifting blocks 69 of the left lifting module 3 and the right lifting module 4 to move towards the second pallet. The line moves and extends into the support openings at both ends of the second pallet. Once in position, a photoelectric sensor on the telescopic cylinder 70 responds, triggering the electric cylinder 82 of the intermediate lifting module 5. The electric cylinder 82 drives the pull plate 81 of the intermediate lifting module 5 to move downward in a straight line. Through the chains (90, 91) of the chain drive module 6, it pulls the left lifting module 3 and the right lifting module 4 upward in a straight line, causing the second pallet and the pallets above it to move upward together, disengaging from the bottom first pallet. When the pallet is lifted to the photoelectric sensor (28, 32, 37, 41), it responds, and the electric cylinder 82... 2. The movement stops, and then the power roller 58 of the bottom conveyor module 2 actuates, driving the right roller 47 and the left roller 54 to rotate, transporting the bottommost single pallet backward to the non-power roller. After transportation is completed, the pallet detaches from the area where the right roller 47, the middle roller 49, and the left roller 54 are located. The photoelectric sensors (57, 55) respond, triggering the electric cylinder 82 to actuate again, pulling the pull plate 81 upward linearly, causing the left lifting module 3 and the right lifting module 4 to move downward as a whole. After the electric cylinder 82 reaches its stroke position, the pallet descends onto the right roller 47, the middle roller 49, and the left roller 54 of the bottom conveyor module 2. When the lifting block is on the side roller 54, the photoelectric sensors (31, 35, 39, 43) respond, and the telescopic cylinder 70 retracts to its original position, pulling the lifting block back to its original position. After it is in place, another photoelectric sensor on the telescopic cylinder 70 responds, triggering the electric cylinder 82 to move. This, through the middle lifting module 5, drives the left lifting module 3 and the right lifting module 4 to lift the lifting block to the position corresponding to the left and right support openings of the second pallet. The electric cylinder 82 stops moving, triggering the lifting blocks of the left and right lifting modules 3 and 4 to extend. Then, the clamping, lifting, and lowering steps are repeated. The rest of the process is automated. Once the stacked pallets are loaded, only a manual replenishment of the pallets is required.

Claims

1. An automatic palletizing equipment for printers, characterized in that, This includes a frame, a bottom conveyor module, a left-side lifting module, a right-side lifting module, a middle lifting module, and a chain drive module, wherein: The frame is placed above the bottom conveying module. A left lifting module, a right lifting module, and a middle lifting module are respectively installed on the frame, capable of vertical linear displacement along the frame. The left and right lifting modules are located on the left and right sides of the frame, respectively, and on the outer sides of the width direction of the bottom conveying module. The middle lifting module straddles the bottom conveying module. The middle lifting module is connected and fixed to the left and right lifting modules via a chain drive module. The lifting and lowering of the middle lifting module drives the left and right lifting modules to move vertically along the frame. The left and right lifting modules are used to clamp the second or more pallets of the stacked pallets placed on the bottom conveying module. Driven by the middle lifting module, the pallets are lifted or the lifted pallets are placed on the bottom conveying module. The bottom conveying module is divided into a pallet placement area and a conveying area along the conveying direction; after the left lifting module and the right lifting module lift the second or more pallets, the bottom conveying module conveys the bottom pallet of the pallet stack placed in the pallet placement area from the pallet placement area to the conveying area.

2. The automatic palletizing equipment for printers according to claim 1, characterized in that, The bottom conveying module includes rollers arranged parallel to each other at intervals along the conveying direction. The rollers between the pallet placement area and the conveying area are powered rollers that can be driven to rotate by a motor. The powered rollers are connected to the rollers in the pallet placement area via chains. The rollers in the conveying area are non-powered rollers. The powered rollers drive the rollers in the pallet placement area to rotate, conveying the pallet from the pallet placement area to the conveying area.

3. The automatic palletizing equipment for printers according to claim 2, characterized in that, The pallet placement area of ​​the bottom conveyor module includes three sets of parallel roller conveyor belts spaced apart. The rollers on both sides of the roller conveyor belts are connected to each other by chains and connected to the power rollers by chains.

4. The automatic palletizing equipment for printers according to claim 2, characterized in that, Photoelectric sensors for sensing the pallet are respectively installed on the two opposite outer sides of the transmission area.

5. The automatic palletizing equipment for printers according to claim 1, characterized in that, The left and right lifting modules each include a pull plate that can be linearly moved up and down to be mounted on the frame. The pull plate is connected to the middle lifting module via the chain drive module. Lifting blocks that extend and retract toward a pallet placed on the bottom conveyor module are respectively provided at both ends of the pull plate. The lifting blocks can extend into the pallet. With the cooperation of the middle lifting module and the chain drive module, the left and right lifting modules lift and lower the pallet.

6. The automatic palletizing equipment for printers according to claim 5, characterized in that, Vertical slide rails are provided on the left and right sides of the frame, and the pull plate is slidably mounted on the vertical slide rails. Horizontal slide rails and telescopic cylinders are provided at both ends below the pull plate. The lifting block is slidably mounted on the horizontal slide rails. The telescopic cylinder is connected to the lifting block and drives the lifting block to extend and retract along the horizontal slide rails toward the pallet.

7. The automatic palletizing equipment for printers according to claim 6, characterized in that, Two photoelectric sensors are installed on each of the telescopic cylinders.

8. The automatic palletizing equipment for printers according to claim 5, characterized in that, A set of photoelectric sensors is provided on both sides of the left and right lifting modules along the conveying direction of the bottom conveying module, and each set of photoelectric sensors has three photoelectric sensors spaced apart from bottom to top.

9. The automatic palletizing equipment for printers according to claim 1, characterized in that, The intermediate lifting module includes a pull plate that can move vertically and linearly on the frame. A lifting cylinder is installed on the frame and connected to the pull plate. The chain drive module includes two chains. At both ends of the pull plate, the pull plates are connected to the pull plates of the left and right lifting modules respectively through one chain of the chain drive module. The lifting cylinder drives the pull plate to move vertically and linearly along the frame, causing the left and right lifting modules to rise or fall as a whole.

10. An automatic palletizing equipment for printers according to claim 9, characterized in that, A drive shaft is provided on the top of the frame above the intermediate lifting module, and gears are provided at both ends of the drive shaft. Gears are also provided on the top of the frame on the left and right lifting modules. The two chains of the chain drive module are respectively wound around the gears.

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