A powder bulk packaging bag stacking system

Abstract

The application discloses a powder bulk packaging bag stacking system, and belongs to the technical field of bulk packaging equipment. A tray distributing device, a tray weighing system, a bag receiving lifting platform and a reweighing system are arranged on a system conveying belt in sequence. A bag hanging weighing device and a layered vibrating device are arranged below a discharging system, and a man platform is arranged on the side of a main support. The system can hang two 500Kg packaging bags, fill them, and vibrate them by using the layered vibrating device. The two-way conveying of the conveying belt and the bag receiving lifting platform can complete the up-and-down stacking. A single 1000Kg packaging bag can be directly filled, and the vibration mechanism of the bag receiving lifting platform can complete the vibration. The tray distributing device can automatically provide the tray unstacking, and the system can integrate the bag hanging weighing, the tray weighing and the reweighing multi-stage measurement and verification. The equipment layout is compact, the mold does not need to be replaced, only the program needs to be switched to adapt to two working conditions, the labor intensity is reduced, the stacking alignment is accurate, the bag shape is regular, and the automatic packaging production requirements of the 500Kg and 1000Kg bulk bags are met.

Description

Technical Field

[0001] This invention belongs to the field of large bag packaging technology and equipment for granular or powdery materials, and specifically relates to a large bag stacking system for powder materials. Background Technology

[0002] In industries such as grain, feed, chemicals, and building materials, powder and granular materials are commonly packaged in large bags for storage and transportation. To increase storage capacity, reduce the number of transport trips, and lower logistics costs, it is often necessary to stack two 500kg bags together on the production floor to form a 1000kg bundle, which facilitates forklift transfer and vehicle palletizing.

[0003] Currently available traditional large-bag packaging equipment has poor adaptability. Switching between different bag sizes requires frequent mold changes and equipment parameter adjustments, resulting in cumbersome operation and low production efficiency. Existing stacking operations mostly rely on manual labor: workers position the bottom layer of bags, then manually hoist and move the upper bags to complete the stacking and binding. This operating mode has significant drawbacks: First, the large bags are heavy, leading to high labor intensity and safety risks such as pinching or crushing injuries. Second, manual alignment is inaccurate, causing stacking to easily shift or tilt, resulting in a shift in the center of gravity of the combined bags, making collapse and tipping during subsequent stacking and transportation highly likely. Third, after powder materials are filled, the internal structure is loose, making effective compaction impossible manually, resulting in bulging and bulky bags that occupy storage and transportation space. Fourth, the handling and stacking process easily pulls at the bag body, causing material to spill from the bag opening and seams, resulting in material loss, dust pollution, and a deterioration of the on-site working environment.

[0004] The few dedicated equipment options available for stacking packaging are scattered, with poor coordination between processes, large machine footprint, and significant stacking alignment errors, also resulting in material spillage. In summary, neither manual labor nor existing equipment can meet the automated production requirements of modern continuous production lines for 500kg single-bag and 1000kg stacked packaging. Therefore, there is an urgent need to develop an integrated system encompassing pallet supply, filling and weighing, compaction, automatic stacking, and re-inspection to achieve precise stacking, bag compaction, reduced labor intensity, and improved packaging quality and production efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a powder bulk packaging bag stacking system.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a powder large packaging bag stacking system, comprising a feeding system mounted on a main support and a conveyor belt mounted below the feeding system, the main support straddling the conveyor belt, characterized in that: a bag hanging weighing device is provided below the feeding system, a layered vibration device for compacting individual 500Kg packaging bags is provided below the bag hanging weighing device, a pallet sorting device is provided at the beginning of the conveyor belt, a pallet weighing system and a bag receiving lifting platform for receiving packaging bags are sequentially arranged in the middle section of the conveyor belt, and a re-weighing system is provided at the end of the conveyor belt; a personnel platform is provided above the conveyor belt and near the layered vibration device; The first packaging bag is manually hung on the hanging bag weighing device for weighing. The main control system controls the feeding system to fill the material. After the material reaches the set weight, the layered vibration device moves under the first packaging bag to lift and vibrate it before lowering and resetting. Meanwhile, the pallet sorting device separates the stacked pallets from bottom to top, sends them to the pallet weighing system via conveyor belt for weighing, and then transports them to the receiving lifting platform. The receiving lifting platform lifts the pallet to receive the first packaged bag after it has been vibrated and compacted. After the lifting lugs are manually removed, the receiving lifting platform descends, and the first packaged bag enters the re-weighing system for re-inspection along with the conveyor belt. After the re-inspection is passed, the conveyor belt runs in reverse, sending the first packaged bag and the pallet back to the receiving lifting platform. The above process of hanging, filling, and compacting is repeated for the second packaging bag. The receiving lifting platform lifts the pallet and the first packaging bag up to receive the second packaging bag and complete the stacking. The receiving lifting platform then descends again, and the two stacked packaging bags are sent to the re-weighing system for final re-inspection by the conveyor belt.

[0007] Furthermore, the pallet sorting device includes a support frame spanning above the conveyor belt. The top of the support frame is provided with a limiting frame for placing the pallet down, a middle frame is fixed in the middle and lower part, and a bottom frame is fixed at the bottom. The conveyor belt is located between the middle frame and the bottom frame. Two sets of pallet-receiving expansion and contraction mechanisms are respectively provided on the two side beams parallel to the conveyor belt in the middle frame. A first cylinder is fixed on the bottom surface of the middle crossbeam of the bottom frame. The piston rod of the first cylinder is fixed to a bottom support plate. The bottom support plate is located between a pair of chains of the conveyor belt and is driven to lift and lower by the first cylinder. The unfolding mechanism is used to support the pallet. When the unfolding mechanism retracts, the pallet is lowered. The first cylinder is extended to lift the bottom support plate, allowing the pallet to be placed on the bottom support plate. The first cylinder is then retracted, causing the bottom support plate to move down below the conveyor belt working surface. The pallet then falls onto the conveyor belt working surface and is conveyed to the next process, realizing the automatic lowering and conveying of the pallet.

[0008] Furthermore, the bag weighing device includes a bracket, with a rectangular mounting frame connected to the bottom of the bracket via at least three connecting components. The connecting components are equipped with sensors. The two corners of the rectangular mounting frame away from the platform are respectively connected to hook components via rotating components. The rotating components rotate the hook components away from the platform closer to the platform, making it easier for operators to pick up and put down the bag hanging ears. Hook components are fixedly installed at the two corners of the rectangular mounting frame near the platform.

[0009] Furthermore, the layered vibration device includes a pair of support rails located inside the central column of the main support, with a ring-belt rack covering the support rails. The pair of support rails extend to the outside of the main support. A drive motor is fixed inside the support rails located outside the main support. The output shaft of the drive motor is connected to the drive shaft through a worm gear reducer. Both ends of the drive shaft are connected to drive pulleys, which are located at one end of the support rails. A driven pulley is located at the other end of the support rails. The ring-belt rack is connected to the drive pulley and the driven pulley to form a closed ring. A movable frame is provided between the pair of support rails. Gears are connected to the left and right outer sides of the movable frame through short shafts. The gears mesh with the ring-belt rack. A first airbag is provided at each of the four corners of the movable frame. The inflation height of the first airbag is controlled by a solenoid valve. A layering plate is provided on the first airbag, and a first vibrator is fixed below the layering plate. The drive motor rotates forward, driving a pair of ring belt racks to rotate synchronously, thereby causing the gears to drive the moving frame into the main support. The first airbag inflates to lift the layered plate, which supports the packaging bags on the hanging bag weighing device and compacts the packaging bags through the first vibrator. The first airbag contracts, the layered plate returns to its original position, the drive motor reverses, and the gears drive the moving frame out of the main support. The compacted packaging bags are then placed on the conveyor belt via the receiving lifting platform and passively transported to the next process.

[0010] Furthermore, the conveyor belt includes a pair of crossbeams supported by multiple support legs, with several rollers spaced apart between the crossbeams; the part of the conveyor belt located below the hanging bag weighing device is a movable section conveyor belt, with movable section rollers spaced apart between a pair of movable section crossbeams on the movable section conveyor belt. The package receiving lifting platform includes a pair of U-shaped steel rails fixed to the rear column of the main support with connectors. A back plate is set in the middle of the main support, and two pairs of guide wheels are set on both sides of the back plate. One end of a chain is fixed at the top of the back plate, and the other end of the chain is connected to a motor. When the motor pulls the back plate up and down through the chain, the guide wheels roll in the U-shaped steel rails.

[0011] An L-shaped frame is fixed to the surface of the back plate. The bottom frame of the L-shaped frame is located below the conveyor belt. Support components are provided at the four corners of the bottom frame. The top surfaces of the four support components are fixed to the bottom of the moving section crossbeam. Two support plates are provided in the middle of the bottom frame. Second airbags are symmetrically arranged at both ends of the two support plates. A vibration table is provided on the four second airbags. Multiple support frames are provided on the vibration table, and the support frames are located between the moving section rollers. A second vibrator is provided at the center of the bottom surface of the vibration table. When the receiving lifting platform rises to receive the pallet containing the packaging bags, the chain drives the back plate and L-shaped frame to rise, simultaneously lifting the movable section conveyor belt. The support frame and the movable section roller are always on the same working surface. When the packaging bag falls onto this working surface, the second airbag starts to work, lifting the vibrating table, thereby causing the support frame to rise from the gap between the movable section rollers. At this time, the support frame is higher than the working surface of the movable section roller, thus supporting the pallet. The second vibrator works to compact the packaging bag.

[0012] Furthermore, the telescoping mechanism includes a pin, a pin shaft is rotatably connected at 1 / 5 of the pin, a connecting shaft is fixed at one end of the pin near the pin shaft, and the piston rod of the second cylinder is fixed to the connecting shaft. Control the second cylinder to retract, so that the pins of the two sets of expansion and contraction mechanisms rotate 90 degrees counterclockwise around the pin shaft, so that the pins are perpendicular to the inner wall of the middle frame, forming four support rods for supporting the pallet. When the second cylinder extends, the pin rotates 90 degrees clockwise around the pivot, and the pin moves to be close to the middle frame, forming a channel in the middle of the support frame, allowing the tray to slide freely along the support frame.

[0013] Furthermore, the support frame consists of four columns, and the limiting frame consists of three horizontal beams fixed to the four columns, forming an open opening on one side. The size of the limiting frame matches the size of the pallet. The height of the middle frame from the working surface of the conveyor belt is greater than the height of a pallet, and the height of the middle frame from the working surface of the conveyor belt is less than the maximum stroke of the first cylinder. A first photoelectric switch is provided on the middle frame; a second photoelectric switch is provided above the conveyor belt and below the middle frame.

[0014] Furthermore, the rotating assembly includes a third cylinder mounted on a rectangular mounting frame and a connecting shaft rotatably connected to the rectangular mounting frame. A connecting plate is fixed to one side of the upper end of the connecting shaft, and a pin is connected to the outer end of the connecting plate. The piston rod of the third cylinder is connected to the pin through a first U-shaped connector. A connecting sleeve is connected to the lower end of the connecting shaft, and a hook assembly is fixed on the connecting sleeve. The extension and retraction of the third cylinder drives the connecting shaft to rotate, thereby driving the hook assembly to move horizontally closer to the platform for personnel to hang bags.

[0015] Furthermore, the hook assembly includes a suspension plate fixedly connected to the connecting sleeve, a hook placement frame is provided on the suspension plate, a fourth cylinder is fixed to the top of the hook placement frame through a connector, a hook is hinged to the bottom of the hook placement frame, and the piston rod of the fourth cylinder is connected to the hook through a second U-shaped connector; the fourth cylinder extends to push the hook to close towards the hook placement frame, and the fourth cylinder retracts to open the hook from the hook placement frame.

[0016] Furthermore, there are two pairs of gears, one pair of which is connected to the front end of the left and right sides of the bottom frame via short shafts, and the other pair of gears is connected to the rear end of the left and right sides of the bottom frame via short shafts.

[0017] The beneficial effects of this invention are: 1. This invention integrates multiple processes such as pallet sorting, material filling, bag compaction, multi-level weighing and inspection, and automatic stacking into one system. The equipment layout is compact, reducing the overall footprint of the machine and eliminating the process connection problems caused by connecting multiple independent machines. It realizes the automated operation of stacking 500kg packaging bags in pairs to form 1000kg combination bags, eliminating the need for manual handling of bags to complete the stacking, and significantly improving production efficiency.

[0018] 2. One set of equipment is compatible with two production modes: it can complete the stacking of two 500kg bags or directly fill a single 1000kg bag. The two modes only require switching programs in the control system; no mold parts need to be replaced, making the equipment highly versatile. In the 500kg stacking mode, a layered vibration device compacts each bag; in the 1000kg single-bag mode, a vibrating mechanism on the receiving lifting platform compacts the bag. Activating the corresponding vibration mechanism for each mode ensures good compaction, resulting in neatly formed bags and reducing the risk of bag collapse during later stacking.

[0019] 3. The bag-hanging weighing device is equipped with a rotatable hook assembly. The hook can rotate to approach the work platform, reducing the worker's operating distance and labor intensity when hanging bags. The hook is driven by a cylinder to open, close, and lock, preventing the packaging bags from accidentally falling off during the hanging process. The pallet sorting device realizes automatic unstacking of entire pallets and automatic lowering and conveying of individual pallets, eliminating the need for manual pallet placement.

[0020] 4. The system is equipped with multiple weighing verification systems, including hanging bag filling weighing, pallet weighing, and end-point re-weighing, to perform closed-loop verification of the net weight of the filling and effectively ensure the accuracy of packaging measurement.

[0021] 5. By utilizing bidirectional conveyor belts in conjunction with the lifting action of the bag receiving platform, the entire process of bag return and stacking is automated, significantly reducing manual intervention and avoiding safety hazards such as hand injuries caused by manual handling; at the same time, it reduces bag pulling and shaking, reduces powder spillage and loss, and improves the dusty working environment on site. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a perspective view of the tray sorting device of the present invention; Figure 3 This is a front view of the tray sorting device of the present invention; Figure 4 This is a schematic diagram of the second cylinder retracting in the expansion and contraction mechanism of the present invention; Figure 5 This is a schematic diagram of the extension of the second cylinder of the telescoping mechanism of the present invention; Figure 6 This is a top view of the tray sorting device of the present invention; Figure 7 This is a front view of the bag-hanging weighing device of the present invention; Figure 8 This is a schematic diagram of the rectangular mounting frame and rotating component of the hanging bag weighing device of the present invention; Figure 9 This is a schematic diagram of the hook assembly of the bag weighing device of the present invention; Figure 10 This is a front view of the layered vibration device and the package receiving lifting platform of the present invention; Figure 11 This is a side view of the layered vibration device and the package receiving lifting platform of the present invention; Figure 12 This is a perspective view of the layered vibration device of the present invention; In the diagram: 1-Feeding system; 2-Pallet sorting device; 21-Support frame; 211-Limit frame; 212-Middle frame; 213-Bottom frame; 22-First cylinder. 23-Base plate, 24-Expansion / retraction mechanism, 241-Second cylinder, 242-Connecting shaft, 243-Pin, 244-Pin shaft, 25-First photoelectric switch, 26-Second photoelectric switch, 27-Tray; 3-Bag weighing device, 31-Bracket, 32-Rectangular mounting frame, 33-Sensor, 34-Rotating assembly, 341-Third cylinder, 342-Connecting shaft, 343-Connecting plate, 344-Pin shaft, 345-First U-shaped connector, 346-Connecting sleeve; 35-Hook assembly, 351-Suspension plate, 352-Hook placement rack, 353-Fourth cylinder, 354-Second U-shaped connector, 355-Hook; 4-Layered vibration device, 41-Support rail, 42-Ring gear. 43-Turbine gearbox, 44-Drive shaft, 45a-Drive pulley, 45b-Driven pulley, 46-Moving frame, 47-Gear, 48-First airbag, 49-Layer plate, 410-First vibrator; 5-Pallet weighing system; 6-Pack receiving lifting platform, 61-U-shaped steel track, 62-Back plate, 63-Guide wheel, 64-Chain, 65-L-shaped frame, 65a-Base frame, 65b-Support plate, 66-Support assembly, 67-Second airbag, 68-Vibration table, 69-Support frame, 610-Second vibrator; 7-Re-weighing system; 8-Conveyor belt, 81-Supporting foot, 82-Crossbeam, 82a-Moving section crossbeam, 83-Roller, 83a-Moving section roller; 9-Personnel platform, 10-Main support; D1-First packaging bag, D2-Second packaging bag. Detailed Implementation

[0023] Example 1 (taking two 500Kg packaging bags stacked together as an example) Work process: Step (1), weigh the hanging bag: Manually press the control button to extend the third cylinder 341, causing the two hooks furthest from the access platform 9 to turn towards the side of the access platform 9; simultaneously, control the fourth cylinder 353 to retract, opening the hooks 355. Manually hang the first packaging bag D1 on the hooks 355. The system automatically weighs the first packaging bag D1 and transmits the weight data to the main control system in real time. Press the control button again to retract the third cylinder 341, extend the fourth cylinder 353, and reset the hook assembly 35.

[0024] Step (two), tray placement: Initially, without adding tray 27, neither the first photoelectric switch 25 nor the second photoelectric switch 26 detects tray 27, and the system alarms, prompting the addition of tray. Simultaneously, the first cylinder 22 is extended (the cylinder extension height is adjusted via a solenoid valve), causing the base plate 23 to rise to the operating surface of the middle frame 212. This controls the extension mechanism 24's second cylinder 241 to extend, at which point the pin 243 is hidden within the middle frame 212 (see...). Figure 5 At this point, a stack of pallets 27 is placed from the opening of the limiting frame 211 onto the bottom support plate 23 using a forklift.

[0025] When the first photoelectric switch 25 senses the tray 27 and the second photoelectric switch 26 does not sense the tray 27, the first cylinder 22 begins to slowly retract, causing the base plate 23 to fall. When the second photoelectric switch 26 detects the tray, it controls the second cylinder 241 to retract. At this time, the pin 243 is in a position perpendicular to the middle frame 212 (see...). Figure 4 ), lift up the second tray from the bottom, When the first cylinder 22 retracts to its final position, the working surface of the bottom support plate 23 is slightly lower than the working surface of the conveyor belt 8, and the bottommost pallet falls onto the conveyor belt 8. Subsequent sections can control the conveyor belt 8 to transport the pallet to the next working condition based on the actual working conditions and the signal fed back by the second photoelectric switch 26. The above process is repeated to deliver the next pallet.

[0026] When the first photoelectric switch 25 does not detect the tray 27, but the second photoelectric switch 26 does, the second cylinder 241 of the extension mechanism 24 is extended, hiding the pin 243 inside the middle frame 212, while the first cylinder 22 remains retracted. The above steps continue until the second photoelectric switch 26 no longer detects the tray.

[0027] Step (3), Vibration re-weighing: Pressing the packaging machine start button activates the conveyor belt 8, transporting the pallet 27 to the pallet weighing system 5 for weighing. The weight information is fed back to the packaging machine control system in real time. Subsequently, the pallet 27 is conveyed to the receiving lifting platform 6 via the conveyor belt 8. At this time, the packaging machine feeding system 1 starts, filling the first packaging bag D1 with material. When the material weight reaches the set value, the layered vibration device 4 moves below the first packaging bag D1, and the first airbag 48 lifts the packaging bag for vibration and compaction. After completion, the layered vibration device 4 descends and resets.

[0028] Simultaneously, the receiving platform 6, carrying the pallet 27, rises to receive the first packaged bag D1, which has been vibrated and tightened. After manually removing the ear loops of the first packaged bag D1, the control button is pressed, and the receiving platform 6 descends to its reset position. After resetting, the first packaged bag D1 is transported by the conveyor belt 8 to the re-weighing system 7 for re-inspection. The net weight for this re-inspection is calculated as follows: Total re-inspection weight - Pallet weight - Weight of single packaged bag = 500 kg. After passing the re-inspection, the conveyor belt 8 reverses its direction, returning the first packaged bag D1 and the pallet 27 to the receiving platform 6.

[0029] Subsequently, the second packaging bag D2 is manually hung on the bag weighing device 3, and the filling and vibration processes are repeated. After completion, the bag receiving lifting platform 6 rises and lifts the second packaging bag D2 to be stacked on top of the first packaging bag D1, thus completing the stacking operation.

[0030] After the packaging is stacked, it is conveyed by conveyor belt 8 to the re-weighing system 7 for a second inspection. The net weight for this re-inspection is calculated as follows: Total weight for re-inspection - Pallet weight - Weight of two packaging bags = 1000 kg. After all re-inspections are passed, the system automatically proceeds to the next process.

[0031] Example 2 (taking a 1000Kg packaging bag as an example) Steps (1) and (2) are the same as in Example 1.

[0032] Step (3), Vibration re-weighing: At this time, press the start button, the conveyor belt 8 starts, and the pallet 27 is transported to the pallet weighing system 5 to complete the weighing. The weight information is fed back to the packaging machine control system in real time. Then the pallet 27 is sent to the receiving lifting platform 6 by the conveyor belt 8.

[0033] At the same time, the packaging machine feeding system 1 is started to fill the packaging bag with materials. When the weight of the materials reaches the system set value, the chain 64 drives the receiving lifting platform 6 to lift the tray 27 and support the packaging bag.

[0034] Then the second airbag 67 inflates and lifts the vibration table 68, and the second vibrator 610 starts to vibrate and tighten the packaging bag; after completion, the vibration table 68 resets, the packaging bag hook is manually removed and the control button is pressed, and the bag receiving lifting platform 6 lowers and resets.

[0035] The packaging bags are conveyed to the re-weighing system 7 via conveyor belt 8 for re-inspection. The net weight for this re-inspection is calculated as follows: Total weight upon re-inspection - Pallet weight recorded by the main control system - Weight of a single bag = 1000 kg.

[0036] illustrate: (a) When stacking two 500Kg packaging bags, use the layered vibration device 4 to vibrate each 500Kg packaging bag, and the second vibrator (610) of the receiving lifting platform (6) does not work.

[0037] (ii) When packaging a single 1000Kg bag, the layered vibration device 4 does not work, and the second vibrator (610) of the bag receiving lifting platform (6) works to compact the bag.

[0038] (iii) When packaging 500Kg bags and 1000Kg bags, simply switch the packaging program on the packaging machine control system.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A powder bulk packaging bag stacking system, comprising a feeding system (1) disposed on a main support (10) and a conveyor belt (8) disposed below the feeding system (1), wherein the main support (10) straddles the conveyor belt (8), characterized in that: The feeding system (1) is equipped with a bag weighing device (3) below it. Below the bag weighing device (3) is a layered vibration device (4) for compacting a single 500Kg packaging bag. The beginning of the conveyor belt (8) is equipped with a pallet distribution device (2). The middle section of the conveyor belt (8) is equipped with a pallet weighing system (5) and a bag receiving lifting platform (6) located below the bag weighing device (3) for receiving packaging bags. The end of the conveyor belt (8) is equipped with a re-weighing system (7). Above the conveyor belt (8) and near the layered vibration device (4) is a personnel platform (9).

2. The powder bulk packaging bag stacking system as described in claim 1, characterized in that: The pallet sorting device (2) includes a support frame (21) spanning above the conveyor belt (8). The top of the support frame (21) is provided with a limiting frame (211) for placing the pallet (27) down, a middle frame (212) is fixed in the middle and lower part, and a bottom frame (213) is fixed at the bottom. The conveyor belt (8) is located between the middle frame (212) and the bottom frame (213). Two sets of expansion and contraction mechanisms (24) for receiving the pallet (27) are respectively provided on the two side beams parallel to the conveyor belt (8) in the middle frame (212). A first cylinder (22) is fixed on the bottom surface of the middle crossbeam of the bottom frame (213). The piston rod of the first cylinder (22) is fixed with a bottom support plate (23). The bottom support plate (23) is located between a pair of chains of the conveyor belt (8) and is driven to lift by the first cylinder (22). The expansion and contraction mechanism (24) unfolds to support the pallet (27), and the expansion and contraction mechanism (24) retracts to lower the pallet (27). The first cylinder (22) is controlled to extend and lift the bottom support plate (23), so that the pallet (27) is lowered onto the bottom support plate (23). The first cylinder (22) is controlled to retract, so that the bottom support plate (23) moves down to below the working surface of the conveyor belt (8), and the pallet (27) falls onto the working surface of the conveyor belt (8) and is conveyed to the next process, thus realizing the automatic lowering and conveying of the pallet.

3. The powder bulk packaging bag stacking system as described in claim 1, characterized in that: The bag weighing device (3) includes a bracket (31), and a rectangular mounting frame (32) is connected to the bottom of the bracket (31) by at least three connecting components. The connecting components are equipped with sensors (33). The two corners of the rectangular mounting frame (32) away from the access platform (9) are connected to hook components (35) by rotating components (34). The hook components (35) away from the access platform (9) are rotated to approach the access platform (9) by rotating components (34), so that the operator can pick up and put down the bag hanging ears. Hook components (35) are fixedly installed at the two corners of the rectangular mounting frame (32) near the platform (9).

4. The powder bulk packaging bag stacking system as described in claim 1, characterized in that: The layered vibration device (4) includes a pair of support rails (41) located inside the middle column of the main support (10). The support rails (41) are covered with a ring-belt rack (42). The pair of support rails (41) extend to the outside of the main support (10). A drive motor is fixed inside the support rails (41) located outside the main support (10). The output shaft of the drive motor is connected to the drive shaft (44) through a worm gear reducer (43). The two ends of the drive shaft (44) are respectively connected to drive pulleys (45a). The drive pulley (45a) is located at one end of the support rail (41), and the other end of the support rail (41) is provided with a driven pulley (45b). The ring-belt rack (42) is connected to the drive pulley (45a) and the driven pulley (45b) to form a closed loop. The ring belt; a movable frame (46) is provided between a pair of support rails (41), and gears (47) are connected to the left and right sides of the movable frame (46) through short shafts. The gears (47) mesh with the ring belt rack (42); a first airbag (48) is provided on each of the four corners of the surface of the movable frame (46), and the inflation height of the first airbag (48) is controlled by a solenoid valve; a layered plate (49) is provided on the first airbag (48), and a first vibrator (410) is fixed below the layered plate (49); When the drive motor rotates forward, it drives a pair of ring-belt racks (42) to rotate synchronously, thereby causing the gear (47) to drive the moving frame (46) into the main support (10). The first airbag (48) expands and lifts the layer plate (49) to support the packaging bag on the hanging bag weighing device (3) and compacts the packaging bag through the first vibrator (410). When the first airbag (48) contracts, the layer plate (49) resets, the drive motor reverses, and the gear (47) drives the moving frame (46) to move out of the main support (10). The compacted packaging bag is then placed on the conveyor belt (8) by the receiving lifting platform (6) and passively moved to the next process.

5. The powder bulk packaging bag stacking system as described in claim 1, characterized in that: The conveyor belt (8) includes a pair of crossbeams (82) supported by multiple support legs (81), and a number of rollers (83) are spaced apart between the crossbeams (82); the part of the conveyor belt (8) located below the hanging bag weighing device (3) is a movable section conveyor belt, and a pair of movable section crossbeams (82a) on the movable section conveyor belt are spaced apart between movable section rollers (83a). The receiving lifting platform (6) includes a pair of U-shaped steel rails (61) fixed to the rear column of the main support (10) by connectors. A back plate (62) is provided in the middle of the main support (10). Two pairs of guide wheels (63) are provided on both sides of the back plate (62). One end of a chain (64) is fixed at the top of the back plate (62). The other end of the chain (64) is connected to a motor. When the motor pulls the back plate (62) up and down through the chain (64), the guide wheels (63) are embedded in the U-shaped steel rails (61) and roll. An L-shaped frame (65) is fixed on the surface of the back plate (62). The bottom frame (65a) of the L-shaped frame (65) is located below the conveyor belt (8). Support components (66) are provided on the four corners of the bottom frame (65a). The top surfaces of the four support components (66) are fixed to the bottom of the moving section crossbeam (82a). Two support plates (65b) are spaced apart in the middle of the bottom frame (65a). Second airbags (67) are symmetrically arranged at both ends of the two support plates (65b). A vibration table (68) is provided on the four second airbags (67). Multiple support frames (69) are provided on the vibration table (68). The support frames (69) are located between the moving section rollers (83a). A second vibrator (610) is provided at the center of the bottom surface of the vibration table (68). When the receiving lifting platform (6) rises to receive the pallet (27) containing the packaging bag, the chain (64) drives the back plate (62) and L-shaped frame (65) to rise, and at the same time, it lifts the moving section conveyor belt. The support frame (69) and the moving section roller (83a) are always on the same working surface. When the packaging bag falls on the working surface, the second airbag (67) starts to work and lifts the vibrating table (68), thereby driving the support frame (69) to rise from the gap between the moving section roller (83a). At this time, the support frame (69) is higher than the working surface of the moving section roller (83a), thereby supporting the pallet (27). The second vibrator (610) works to compact the packaging bag.

6. The powder bulk packaging bag stacking system as described in claim 2, characterized in that: The telescoping mechanism (24) includes a pin (243), a pin shaft (244) is rotatably connected at 1 / 5 of the pin (243), a connecting shaft (242) is fixed at one end of the pin (243) near the pin shaft (244), and the piston rod of the second cylinder (241) is fixed to the connecting shaft (242); Control the second cylinder (241) to retract, so that the pins (243) of the two sets of expansion and contraction mechanisms (24) rotate 90 degrees counterclockwise around the pin shaft (244), so that the pins (243) are perpendicular to the inner wall of the middle frame (212) to form four support rods for supporting the tray (27). When the second cylinder (241) extends, the pin (243) rotates 90 degrees clockwise around the pin shaft (244), and the pin (243) moves to be close to the middle frame (212), so that a channel is formed in the middle of the support frame (21), and the tray (27) can slide freely along the support frame (21).

7. The powder bulk packaging bag stacking system as described in claim 6, characterized in that: The support frame (21) consists of four columns, and the limiting frame (211) consists of three horizontal beams fixed to the four columns, forming an open opening on one side. The size of the limiting frame (211) matches the size of the tray (27). The height of the middle frame (212) from the working surface of the conveyor belt (8) is greater than the height of a tray (27), and the height of the middle frame (212) from the working surface of the conveyor belt (8) is less than the maximum stroke of the first cylinder (22); A first photoelectric switch (25) is provided on the middle frame (212); a second photoelectric switch (26) is provided above the conveyor belt (8) and below the middle frame (212).

8. The powder bulk packaging bag stacking system as described in claim 3, characterized in that: The rotating assembly (34) includes a third cylinder (341) mounted on a rectangular mounting frame (32) and a connecting shaft (342) rotatably connected to the rectangular mounting frame (32). A connecting plate (343) is fixed on one side of the upper end of the connecting shaft (342), and a pin (344) is connected to the outer end of the connecting plate (343). The piston rod of the third cylinder (341) is connected to the pin (344) through a first U-shaped connector (345). A connecting sleeve (346) is connected to the lower end of the connecting shaft (342), and a hook assembly (35) is fixed on the connecting sleeve (346). The third cylinder (341) extends and retracts to drive the connecting shaft (342) to rotate, thereby driving the hook assembly (35) to move horizontally to the vicinity of the personnel platform (9) for convenient personnel to hang bags.

9. The powder bulk packaging bag stacking system as described in claim 3, characterized in that: The hook assembly (35) includes a suspension plate (351) fixedly connected to the connecting sleeve (346). The suspension plate (351) is provided with a hook placement frame (352). The top of the hook placement frame (352) is fixed with a fourth cylinder (353) through a connector. The bottom of the hook placement frame (352) is hinged to a hook (355). The piston rod of the fourth cylinder (353) is connected to the hook (355) through a second U-shaped connector (354). When the fourth cylinder (353) extends, it pushes the hook (355) to close to the hook placement frame (352). When the fourth cylinder (353) retracts, it opens the hook (355) from the hook placement frame (352).

10. The powder bulk packaging bag stacking system as described in claim 4, characterized in that: There are two pairs of gears (47). One pair of gears (47) is connected to the front end of the left and right sides of the bottom frame (46) via a short shaft, and the other pair of gears (47) is connected to the rear end of the left and right sides of the bottom frame (46) via a short shaft.

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