A semi-automatic packaging line and a packaging method

Abstract

This invention discloses a semi-automatic packaging line and packaging method. The packaging line includes a packaging line support, and a metering and feeding system, a bag-holding system, a weighing and supporting system, a bag clamping and stretching system, a rail lifting system, a car lifting system, a car moving system, a heat sealing system, a sewing system, a packaging conveying system, a hydraulic station, and a controller, all installed on the support. This invention has a simple structure and stable operation, providing a highly compatible semi-automatic packaging line for packaging various types and specifications of materials.

Description

Technical Field

[0001] This invention relates to the field of automatic packaging machinery technology, and in particular to a semi-automatic packaging line and packaging method. Background Technology

[0002] Currently, there are many types of packaging machines on the market, but most are designed for packaging scenarios with large production capacity and a single type of material. When the bulk density of the same material changes, existing packaging machines often struggle to operate stably, leading to inaccurate measurement and substandard packaging. Furthermore, existing packaging machines typically use two or more power sources, such as pneumatic and electric, making the control system complex and maintenance difficult. In the weight verification process, most equipment relies on manual operation, which is not only inefficient but also prone to causing some packaging bags to be underweight, affecting product quality. Existing packing trolleys often employ complex structures such as motors, gears, and positioners, resulting in high equipment costs and significant control difficulties. Summary of the Invention

[0003] This invention provides a semi-automatic packaging line and packaging method, which has the functions of simple structure, stable operation, accurate measurement, strong compatibility and automatic verification of packaging weight, thus solving the above-mentioned defects of existing packaging machines.

[0004] To solve the above-mentioned technical problems, the present invention provides a semi-automatic packaging line, including a packaging line bracket, and a metering and feeding system, a bag holding system, a weighing and bag supporting system, a bag clamping and stretching system, a car rail lifting system, a car lifting system, a car moving system, a heat sealing system, a sewing system, a packaging conveying system, a hydraulic station and a controller installed on the bracket;

[0005] The metering and feeding system, bag holding system, and weighing and supporting system are arranged sequentially along the material flow direction to form a filling and weighing station; the bag clamping and stretching system, heat sealing system, and sewing system are arranged sequentially along the movement direction of the carriage moving system to form a sealing station; the packaging conveying system is set at the end of the sealing station; wherein, the filling and weighing station and the sealing station are connected by the carriage lifting system, the rail lifting system, and the carriage moving system to form a continuous automated packaging process;

[0006] The metering and feeding system includes a telescopic cylinder top valve, a metering funnel, and a stirring piston valve connected in sequence via a flexible connector; the extension stroke of the piston cylinder shaft of the stirring piston valve is linked with the weight sensor of the metering funnel through a linkage, so that the closing action of the piston valve is synchronized with the material flowing into the packaging bag to reach the set weight.

[0007] The carriage bag lifting system includes a main frame and a sub-frame that can move along the carriage track, as well as a side-flipping drive mechanism that drives the main frame and the sub-frame to move relative to each other to clamp or release the packaging bag.

[0008] The carriage moving system includes a first drive mechanism and a second drive mechanism. The first drive mechanism is detachably connected to the main frame, and the second drive mechanism is detachably connected to the sub-frame. The first drive mechanism and the second drive mechanism operate alternately to drive the carriage to move back and forth between the filling station and the sealing station.

[0009] The rail lifting system is used to lift or lower the car body to achieve the connection and disconnection between the first drive mechanism, the second drive mechanism and the main frame and the sub-frame.

[0010] The clamping and strapping system is installed on the main frame of the carriage hoisting system;

[0011] The heat sealing system and the sewing system are arranged sequentially along the moving direction of the carriage moving system;

[0012] The packaging conveying system is positioned behind the sewing system.

[0013] The hydraulic station and controller are used to provide power and control for each system.

[0014] In a preferred embodiment of the present invention, the stirring piston valve includes a stirrer and a piston valve; the stirrer includes a stirring chamber, a stirring motor, a stirring shaft, and stirring blades; the upper opening of the stirring chamber is connected to the bottom opening of the metering funnel, and its lower opening is connected to the valve shell of the piston valve; the stirring shaft is transversely inserted into the stirring chamber and is driven by the stirring motor; the stirring blades are fixed on the stirring shaft.

[0015] In a preferred embodiment of the present invention, the bag holding system includes a discharge pipe and a clamping mechanism; the upper opening of the discharge pipe is connected to the outlet of the piston valve, and the lower outer wall of the discharge pipe is provided with a circular cylinder for fitting the opening of the packaging bag; the clamping mechanism includes two rotating cylinders and two clamping rods; the two rotating cylinders are respectively horizontally fixed on the two side walls of the middle part of the discharge pipe, and their shafts are connected to the clamping rods to drive the clamping rods to perform clamping or releasing actions.

[0016] In a preferred embodiment of the present invention, the weighing and palletizing system includes a weighing and lifting cylinder, a lifting tray, and a weighbridge; the weighing and lifting cylinder is installed vertically, with the lifting tray installed at the top of its shaft head, and a positioner is provided on its cylinder shell; the weighbridge is set on the lifting tray, and its weight sensor is electrically connected to the controller.

[0017] In a preferred embodiment of the present invention, the bag-stretching system includes a bag-stretching deployment cylinder and two clamp cylinders; the bag-stretching deployment cylinder is horizontally mounted on the upper horizontal side bar of the main frame, and one clamp cylinder is fixed to each of its two shaft ends; the clamp cylinder is horizontally mounted, and a clamp is connected to its shaft end; the clamp includes a fixed clamp arm and a movable clamp arm that are hinged to each other, the fixed clamp arm is mounted on the cylinder shell of the clamp cylinder, and the movable clamp arm is driven by the extension and retraction of the clamp cylinder shaft to realize the opening and closing of the clamp jaws.

[0018] In a preferred embodiment of the present invention, the rail lifting system includes two rails and two rail lifting cylinders; the rail lifting cylinders are installed vertically with their shafts facing upward and fixed to a rail support base plate, and the rails are fixedly installed on the rail support base plate through connectors at their ends.

[0019] In a preferred embodiment of the present invention, the heat sealing system includes two telescopic cylinders and two transverse clamping plates; the telescopic cylinders are arranged with their shafts facing each other, and each shaft is fixed to a transverse clamping plate, and their bases are respectively fixed to the support beam; one of the transverse clamping plates is embedded with a heating wire, and the power line of the heating wire is connected to the second switch of the controller.

[0020] In a preferred embodiment of the present invention, the sewing machine of the bag sewing system is installed on the right side of the heat sealing system with its seam facing downwards, and the power cord is connected to the third switch of the controller.

[0021] In a preferred embodiment of the present invention, the packaging conveying system is a conveyor belt, which is installed on the lower right side of the bracket, with one end extending into the bracket and located below the carriage lifting system; the motor power supply of the conveyor belt is connected to the first switch of the controller.

[0022] To address the aforementioned technical problems, this invention also discloses a packaging method based on the aforementioned semi-automatic packaging line, comprising the following steps:

[0023] (1) In response to the completion of manual bagging and the start signal, open the top valve of the telescopic cylinder and start the agitator to allow the material to flow into the metering funnel;

[0024] (2) When the weight of the material in the metering funnel is greater than the preset multiple of the set packaging quantity, close the top valve and stop stirring, and send a metering ready signal;

[0025] (3) In response to the metering ready signal, control the bag holding system to clamp the bag opening and control the weighing and supporting system to rise to support the bottom of the packaging bag;

[0026] (4) Open the piston valve to fill the material, and control the piston valve to close through the linkage so that the amount of material flowing into the packaging bag accurately reaches the set weight.

[0027] (5) After the weighing and palletizing system verifies that the weight is qualified and issues a qualified signal, the automatic handover and transfer process of the packaging bags from the filling station to the sealing station is executed, including:

[0028] The first drive mechanism is controlled to work in coordination with the rail lifting system to position and lift the empty car to the clamp position;

[0029] The bag clamping and stretching system works in coordination with the car body lifting system to clamp and stretch the packaging bags, and separate them from the bag holding system and the weighing and supporting system.

[0030] The first drive mechanism is controlled to move the heavy-duty carriage to the location of the heat sealing system.

[0031] (6) At the sealing station, the heat sealing system and the sewing system are controlled to heat seal and sew the bag opening in sequence;

[0032] (7) Control the second drive mechanism to move the carriage above the packaging conveyor system and release the packaging bags;

[0033] (8) Execute the system reset process, control the packaging conveying system to output packaging bags, and control the second drive mechanism and the rail lifting system to move the empty car body and lower it to the position where the first drive mechanism and the main frame can be connected.

[0034] The beneficial effects of this invention are as follows: This invention provides a semi-automatic packaging line and packaging method, which reduces the measurement error from ±200g in traditional equipment to within ±50g through the linkage control of the piston valve cylinder shaft stroke and the weight sensor, effectively overcoming the measurement inaccuracy problem caused by changes in material bulk density; by setting up a weighing and palletizing system, the weight is verified immediately after filling, achieving 100% packaging qualification and eliminating the risk of missed inspections by manual sampling.

[0035] In addition, the use of a bottomless carriage with main and auxiliary frames combined with a lifting and snap-fit ​​switching mechanism reduces the transfer time from filling to sealing of packaging bags from 15 seconds in the traditional solution to 8 seconds, increasing production efficiency by more than 46%.

[0036] This packaging line can be easily adjusted to accommodate various types of packaging bags with widths of 300-600mm, lengths of 500-1000mm, and opening circumferences of 400-800mm, without requiring replacement of major components, thus significantly improving the equipment's versatility and compatibility. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of a preferred embodiment of a semi-automatic packaging line according to the present invention;

[0038] Figure 2 This is a schematic diagram of the metering and feeding system and the bag holding system shown.

[0039] Figure 3 This is a top view schematic diagram of the bag holding system shown.

[0040] Figure 4 This is a three-dimensional structural diagram of the test bag support system shown.

[0041] Figure 5 This is a three-dimensional structural diagram of the clamp bag and stretcher bag system shown.

[0042] Figure 6 This is a top view schematic diagram of the clamp bag stretcher system shown.

[0043] Figure 7 This is a three-dimensional structural diagram of the rail lifting system shown.

[0044] Figure 8 This is a top view schematic diagram of the track lifting system shown.

[0045] Figure 9 This is a three-dimensional structural diagram of the carriage moving system shown.

[0046] Figure 10 This is a three-dimensional structural schematic diagram of the heat sealing system shown.

[0047] Figure 11 This is a three-dimensional structural diagram of the overhead bag system in the carriage shown.

[0048] Figure 12 This is a structural schematic diagram of the main frame and sub-frame of the carriage hoisting system in the side-folded and closed state.

[0049] Figure 13 This is a schematic diagram of the main frame structure of the overhead bag system in the carriage shown.

[0050] Figure 14 This is a schematic diagram of the subframe structure of the overhead bag system in the carriage shown.

[0051] Figure 15 yes Figure 12 Enlarged structural diagram of the square frame section;

[0052] The components in the attached diagram are labeled as follows:

[0053] 100. Metering and feeding system; 101. Telescopic cylinder top valve; 102. Metering funnel; 103. Flexible connector; 104. Weight sensor; 105. Agitator; 106. Piston valve; 1051. Agitator chamber; 1052. Agitator motor; 1053. Agitator shaft; 1054. Agitator blades.

[0054] 200. Bag holding system; 201. Discharge pipe; 202. Rotary cylinder; 203. Clamping rod; 204. Circular cylinder body;

[0055] 300. Weighing and pallet holding system; 301. Weighing and lifting cylinder; 302. Lifting pallet; 303. Weighbridge scale; 3011. Positioner;

[0056] 400. Bag clamping and stretching system; 401. Bag stretching deployment cylinder; 402. Clamping cylinder; 4021. Fixed clamping arm; 4022. Movable clamping arm; 4023. Loop;

[0057] 500. Rail lifting system; 501. Rail; 502. Rail lifting cylinder; 503. Rail support plate; 504. End flange;

[0058] 600. Carriage hoisting system; 601. Main frame; 602. Sub-frame; 603. Roller; 604. Side tilting extension cylinder; 605. Low-position clamp; 606. High-position clamp; 6031. Ball bearing;

[0059] 700. Carriage moving system; 701. Left shift cylinder; 702. Right shift cylinder;

[0060] 800. Heat sealing system; 801. Telescopic cylinder; 802. Transverse clamping plate;

[0061] 900. Sewing system;

[0062] 1000. Packaging and conveying system. Detailed Implementation

[0063] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0064] Example 1

[0065] This invention discloses a semi-automatic packaging line, including a metering and feeding system 100, a bag holding system 200, a weighing and supporting system 300, a bag clamping and stretching system 400, a rail lifting system 500, a car lifting system 600, a car moving system 700, a heat sealing system 800, a sewing system 900, a packaging conveying system 1000, a hydraulic station, and a controller.

[0066] The packaging line bracket serves as the main support for the entire packaging line.

[0067] The metering and feeding system 100, the bagging and holding system 200, and the weighing and holding system 300 are arranged sequentially along the material flow direction, together forming the filling and weighing station.

[0068] The bag clamping and stretching system 400, the heat sealing system 800, and the sewing system 900 are arranged sequentially along the horizontal movement direction to form a sealing station.

[0069] The packaging conveying system 1000 is located below the end of the sealing station. The rail lifting system 500, the car lifting system 600, and the car moving system 700 constitute the transfer hub connecting the filling and weighing station and the sealing station.

[0070] Specifically, the metering and feeding system 100 includes a telescopic cylinder top valve 101, a metering funnel 102, a flexible connector 103, a weight sensor 104, and a stirring piston valve.

[0071] The telescopic cylinder top valve 101 is used to unload the material in the dryer into the metering funnel 102. The upper port of the valve body of the telescopic cylinder top valve 101 is connected to the bottom port of the upstream dryer (not shown in the figure) through a flange. A cylinder fixed on the outer wall of the valve body drives the valve core to move up and down, thereby opening and closing the valve. The hydraulic power source of the telescopic cylinder top valve 101 is connected to the No. 1 pressure holding valve of the hydraulic station.

[0072] The metering funnel 102 is used to temporarily store materials and measure their weight. Four high-precision weight sensors 104 are installed under the four supports on the outer wall of the metering funnel 102. The sensor bases are placed in the positioning grooves of the top beam of the packaging line support, thereby elastically supporting the entire metering system and achieving accurate weighing.

[0073] The lower welded ring of the valve body of the telescopic cylinder top valve 101 and the upper welded ring of the metering funnel 102 are respectively wrapped and connected to the top and bottom ends of the flexible connector 103 to form a material flow channel. The flexible connector 103 is usually made of wear-resistant canvas or rubber tube, which serves as a connection and buffer.

[0074] The stirring piston valve includes a stirrer 105 and a piston valve 106. The stirrer comprises a stirring chamber 1051, a stirring motor 1052, a stirring shaft 1053, and stirring blades 1054. The upper opening of the stirring chamber 1051 is connected to the bottom flange of the metering funnel 102. The stirring motor 1052 is mounted on the outer wall of the stirring chamber 1051. The stirring shaft 1053 extends laterally through the stirring chamber 1051, and stirring blades 1054 are fixed on the shaft. One end of the stirring shaft 1053 is embedded in a grooved packing ring on the inner wall of the stirring chamber 1051, and the other end extends out of the stirring chamber 1051 and connects to the output shaft of the stirring motor 1052, rotating under the drive of the stirring motor 1052 to break arches, homogenize materials, and increase fluidity.

[0075] The upper opening of the piston valve 106 is connected to the bottom flange of the stirring chamber 1051, and its lower opening is fastened to the bag holding system via a flanged flange. The hydraulic power source of the piston valve 106 is connected to the No. 2 pressure holding valve of the hydraulic station.

[0076] The weight sensor 104 of the metering funnel 102 is linked to the piston valve 106 via a linkage. Its working principle is as follows: during filling, the piston valve retracts, opening the valve; simultaneously, the weight sensor 104 monitors the decrease in material weight within the metering funnel 102 in real time. When the decrease equals the set packaging amount, the linkage controls the piston valve to fully extend, closing the valve and achieving accurate metering. In a preferred embodiment, the linkage employs an electrical proportional control mechanism, which includes a controller electrically connected to the weight sensor 104 and a proportional directional valve connected to the hydraulic circuit of the piston valve 106 (the #2 pressure-holding valve is normally open as the main valve, with flow regulation by the proportional directional valve). Based on the real-time weight signal from the weight sensor 104, the controller dynamically adjusts the opening of the proportional valve using a built-in algorithm, causing the piston valve to extend synchronously with the decrease in material weight and fully close when the set weight is reached.

[0077] In another preferred embodiment, the linkage is a program module built into the controller. This module receives the weight change signal from the weight sensor 104 in real time and calculates the required extension speed of the piston valve cylinder shaft using a preset algorithm. It then controls the #2 pressure-holding valve of the hydraulic station to supply oil to the rodless chamber of the piston valve 106, allowing the cylinder shaft to extend smoothly and completely close the valve when the set weight is reached. Both methods can achieve accurate measurement, and the choice can be made according to the actual working conditions.

[0078] Specifically, the bag-holding system 200 includes a discharge pipe 201, two rotary cylinders 202, and two clamping rods 203. The discharge pipe 201 is a vertical pipe whose upper end is connected to the lower end of the piston valve 106 via a flange. Its lower end has a protruding circular cylinder 204 for manually placing the bag opening. The two rotary cylinders 202 are arranged horizontally and symmetrically with their shafts facing outwards. The bases of the rotary cylinders 202 are fixed to the two side walls in the middle of the discharge pipe 201, and their shafts are connected to the flanges of the clamping rods 203. The hydraulic power sources of the two rotary cylinders 202 are connected to the pressure-holding valve #3 of the hydraulic station. When a bag-clamping signal is received, the two rotary cylinders 202 rotate clockwise, driving the two clamping rods 203 to flip down from both sides, tightly pressing the bag opening against the circular cylinder 204.

[0079] Specifically, the weighing and palletizing system 300 includes a weighing and lifting cylinder 301, a lifting tray 302, and a weighbridge 303. The weighing and lifting cylinder 301 is vertically mounted on the base beam of the packaging line support, and its cylinder housing is equipped with an adjustable height positioner 3011, capable of raising to different heights for different sizes of packaging palletizers. The lifting tray 302 is fixed to the top of the shaft of the weighing and lifting cylinder 301. The weighbridge 303 is placed on the lifting tray 302, and its bottom weight sensor is electrically connected to a controller.

[0080] The hydraulic power source of the weighing lifting cylinder 301 is connected to the pressure holding valve #7 of the hydraulic station. During operation, the weighing lifting cylinder 301 extends and lifts the bottom of the packaging bag to the set height through the lifting tray 302 and the weighbridge 303. After filling is completed, the weighbridge 303 performs the final weight verification of the packaging bag.

[0081] The rail lifting system 500 includes two parallel rails 501 and two rail lifting cylinders 502. The rail lifting cylinders 502 are installed vertically with their shafts facing upwards and fixed to a rail support base plate 503. Both ends of the rails 501 are provided with external threads and are fastened to the rail support base plate 503 through end flanges 504 with internal threads.

[0082] The carriage loading and unloading system 600 includes a main frame 601, a sub-frame 602, rollers 603, and a side-tilting extension cylinder 604. Both the main frame 601 and the sub-frame 602 are frame structures welded from structural steel. The main frame 601 has a low-position locking member 605 on its right side, with the locking opening facing downwards; the sub-frame 602 has a high-position locking member 606 on its left side, with the locking opening facing upwards. Each vertical rod of the main frame 601 and the sub-frame 602 has an embedded hole in its lower middle section, into which the rollers 603 are installed. Several ball bearings are embedded in the wheel shell of the roller 603. The rail 501 passes through the roller cavity, and the ball bearings roll between the wheel shell and the rail 501, achieving low-friction movement and rotation. The two ends of the rollers are sealed and limited by end caps and bolts. The two ends of the side-tilting extension cylinder 604 are connected to the upper parts of the main frame 601 and the sub-frame 602 respectively via universal joint loose bolts. When the power shaft of the tilting extension cylinder 604 extends, the main frame 601 and the auxiliary frame 602 tilt and close, clamping the packaging bag; when the power shaft of the tilting extension cylinder 604 retracts, the main frame 601 and the auxiliary frame 602 return to their upright position. The hydraulic power source of the tilting extension cylinder 604 is connected to the pressure holding valve #5 of the hydraulic station. For clarity, in this invention, the car body lifting system refers to the frame assembly used to clamp the packaging bag and can move along the rails; the car body moving system refers to the power assembly used to drive the car body lifting system to move along the rails.

[0083] The carriage moving system 700, used to drive the carriage to move back and forth, includes a left-moving cylinder 701 and a right-moving cylinder 702. The left-moving cylinder 701 is installed horizontally with its axle head facing right. Its side base is fixed to a column of the packaging line bracket near the main frame 601, positioned relatively low, and its axle head is equipped with a locking pin. The right-moving cylinder 702 is also installed horizontally with its axle head facing left. Its side base is fixed to a column of the bracket near the auxiliary frame 602, located above the left-moving cylinder 701, forming a differential arrangement. Its axle head is also equipped with a locking pin. The left-moving cylinder 701 engages with a low-position locking pin on the right side of the main frame 601 for moving an empty carriage to the left and a heavy-load carriage to the right; the right-moving cylinder 702 engages with a high-position locking pin on the left side of the auxiliary frame for moving a heavy-load carriage to the right and an empty carriage to the left. The hydraulic power sources of the left-moving cylinder 701 and the right-moving cylinder 702 are respectively connected to the pressure-holding valve #8 and the pressure-holding valve #11 of the hydraulic station.

[0084] The bag-holding and stretching system 400 is installed on the main frame 601 of the bag-holding system in the carriage, and includes a stretching cylinder 401 and two clamp cylinders 402. The stretching cylinder 401 is installed horizontally, and its cylinder shell is fixed to the upper horizontal bar of the main frame 601 via a central seat. The two clamp cylinders 402 are installed horizontally respectively, and their bases are fixed to the two shafts of the stretching cylinder 401. Clamping tools are connected to the shafts of the clamp cylinders 402. The clamping tools include a fixed clamping arm 4021 (static clamping head) and a movable clamping arm 4022 (dynamic clamping head) hinged together. The fixed clamping arm 4021 is installed on the cylinder shell of the clamping cylinder 402, and the movable clamping arm 4022 is driven by the extension and retraction of the clamping cylinder shaft.

[0085] Specifically, the pliers cylinder shaft head is provided with a collar 4023, which is used to fit the handle pin of the movable pliers arm 4022 to realize the swing of the movable pliers arm; when the pliers cylinder 402 extends, the movable pliers arm 4022 rotates around the hinge point and together with the fixed pliers arm 4021 clamps the side of the packaging bag.

[0086] like Figure 12 , Figure 15 As shown, the roller 603 has several balls 6031 embedded in its shell. The balls roll between the shell and the rail 501 to achieve low-friction movement. The balls 6031 are made of wear-resistant steel and are evenly distributed on the inner wall of the roller to ensure smooth movement of the carriage.

[0087] The dynamic clamp head and the handle's movable pin are bent at a 90-degree angle. The static clamp head has a movable pin for inserting into the movable sleeve of the dynamic clamp head. When the clamp cylinder 402 extends to clamp the bag edge, the bag stretching cylinder 401 extends, stretching the packaging bag to both sides. The hydraulic power sources of both clamp cylinders 402 are connected to the #4 pressure holding valve of the hydraulic station. The hydraulic power source of the bag stretching cylinder 401 is connected to the #9 pressure holding valve of the hydraulic station.

[0088] The heat sealing system 800 includes two telescopic cylinders 801 and two transverse clamping plates 802. The telescopic cylinders 801 are arranged with their shafts facing each other, their bases fixed to the crossbeam of the packaging line support, and each shaft head fixed to a transverse clamping plate 802. One of the transverse clamping plates 802 has an embedded heating wire, the power cord of which is connected to the second switch of the controller. The hydraulic power source for the two telescopic cylinders 801 is connected to the No. 10 pressure-holding valve of the hydraulic station.

[0089] The sewing system 900 is a sewing machine. The sewing machine is installed on the right side of the heat sealing system 800 with its seam facing downwards, and its power cord is connected to the third switch of the controller.

[0090] The packaging conveying system 1000 is a conveyor belt, which is installed on the lower right side of the bracket, with one end extending into the bracket and located below the carriage lifting system; the motor power supply of the conveyor belt is connected to the first switch of the controller.

[0091] The hydraulic station includes a hydraulic pump, an oil tank, multiple solenoid directional valves, and pressure-holding valves. Each actuating hydraulic cylinder (such as the telescopic cylinder top valve 101, piston valve 106, rotary cylinder 202, weighing lifting cylinder 301, side-tilting extension cylinder 604, clamp cylinder 402, bag unfolding cylinder 401, left-moving cylinder 701, right-moving cylinder 702, heat-sealing telescopic cylinder 801, and rail lifting cylinder 502) is connected to the hydraulic pump via an independent pressure-holding valve. The solenoid of each pressure-holding valve is controlled by the output module of the PLC controller. When the controller issues an action command, the corresponding pressure-holding valve is energized, and pressurized oil enters the working chamber of the hydraulic cylinder. When the set position or pressure is reached, the pressure-holding valve is de-energized and the oil circuit is locked, keeping the hydraulic cylinder in its current state. Proximity switches are installed at both ends of the stroke of all hydraulic cylinders to provide feedback signals to the controller.

[0092] The hydraulic station provides power to all hydraulic cylinders, and each pressure-holding valve is independently controlled by a controller. The controller uses a PLC to receive signals from various sensors (weight sensors, position sensors, etc.) and controls the start and stop of each hydraulic valve and motor according to a preset program, coordinating the entire packaging process.

[0093] This packaging line is suitable for packaging bags of various materials, including but not limited to woven plastic bags, paper bags, composite bags, and plastic bags. For bag openings of different materials, the temperature of the heating wire and the heat sealing time of the heat sealing system 800 can be adjusted to accommodate them. For packaging bags of different sizes, compatibility can be achieved by adjusting the height of the positioner 3011 on the weighing lifting cylinder 301, changing the diameter of the circular cylinder 204 of the unloading pipe 201, and adjusting the jaw opening of the bag clamping and stretching system 400. Testing has shown that this equipment can stably handle packaging bags with widths of 300-600mm and lengths of 500-1000mm, demonstrating wide adaptability.

[0094] Example 2

[0095] This embodiment discloses a packaging method based on the automated packaging line in Embodiment 1, which specifically includes the following steps:

[0096] S1. Preparation: Start the hydraulic station and set the system pressure. Set the target packaging weight and the allowable error of the weighbridge (e.g., ±50g) on ​​the controller, and adjust the height of the positioner 3011 on the weighing lifting cylinder 301 according to the packaging bag specifications.

[0097] S2. Manual bagging and start-up: The operator places the bag opening onto the circular cylinder 204 of the unloading pipe 201, holds the corner of the bag, and presses the start button.

[0098] S3. Top Valve Opening and Material Preparation: The controller responds to the start-up signal and controls the pressure supply of the No. 1 pressure-holding valve to retract the cylinder of the telescopic cylinder top valve 101, opening the top valve; at the same time, the stirring motor 1052 is turned on. The material in the dryer flows into the metering funnel 102.

[0099] S4. Top Valve Closure and Metering Readiness: When the weight sensor 104 of the metering funnel 102 detects that the material weight is greater than 1.2 times the set packaging quantity, the controller controls the #1 pressure holding valve to switch direction, the cylinder of the telescopic cylinder top valve 101 extends to close the top valve, and at the same time, the stirring motor 1052 is turned off. The green flashing light of the weight sensor 104 illuminates, indicating that metering is ready.

[0100] S5. Bag clamping and supporting: When the controller receives the green flashing light signal, it starts the pressure holding valve #3 to make the rotating cylinder 202 rotate forward, and the clamping rod 203 clamps the bag mouth; at the same time, it starts the pressure holding valve #7 to make the weighing lifting cylinder 301 extend, and the weighbridge 303 supports the bottom of the packaging bag to the set height.

[0101] S6. Filling: The controller starts the pressure holding valve #2 to open the piston valve 106, and the material in the metering funnel 102 flows into the packaging bag.

[0102] S7. Precise Metering and Valve Closure: Through the linkage, the piston valve 106 cylinder shaft slowly extends as the material in the metering funnel 102 decreases. When the amount of material reduction in the metering funnel reaches the set packaging amount, the piston valve 106 is completely closed. At this time, the weighbridge 303 verifies that the total weight is qualified and the green light illuminates.

[0103] S8. When the controller receives the green light signal from the weighbridge, it controls the pressure holding valve #8 to retract the left shift cylinder 701. The empty truck bed (with the main frame and auxiliary frame in an upright position) moves to the left and is directly below the unloading pipe 201, waiting to unload the packaging.

[0104] S9. The controller activates pressure valve #6, causing the rail lifting cylinder 502 to extend and lift rail 501 and the entire car body to the bag clamping position. Then, pressure valve #5 is activated, causing the side-tilting extension cylinder 604 to extend, and the main frame 601 and auxiliary frame 602 to tilt and close, clamping the middle of the packaging bag. Next, pressure valve #4 is activated, causing both clamp cylinders 402 to extend and drive the clamp jaws to close, clamping the sides of the packaging bag.

[0105] S10, the controller controls the #3 pressure holding valve to reverse, causing the rotary cylinder 202 to reverse and the clamping rod 203 to release the bag opening; then, it controls the #7 and #6 pressure holding valves to cause the weighing lifting cylinder 301 and the track lifting cylinder 502 to retract and descend sequentially, completely detaching the bag opening from the unloading pipe 201. The retraction stroke of the track lifting cylinder 502 is limited by the limiter, so that after descent, the locking pin of the left shift cylinder 701 remains engaged with the low-position locking piece 605 of the main frame 601.

[0106] S11. The controller controls the #9 pressure-holding valve to extend the bag-unfolding cylinder 401, which simultaneously unfolds the two clamp cylinders, stretching the packaging bag. Then, it controls the #8 pressure-holding valve to extend the left-moving cylinder 701, driving the heavy-duty carriage to move to the right to the heat-sealing system 800 position.

[0107] S12, Heat Sealing: The controller activates pressure valve #10, causing the heat sealing telescopic cylinder 801 to extend, and the two transverse clamping plates 802 close to clamp the bag opening. Simultaneously, the second switch is activated, energizing the heating wire for heat sealing. After the set time is reached, the second switch is deactivated, and pressure valve #10 is slowly retracted, keeping the bag opening upright during the loosening process of the transverse clamping plates 802.

[0108] S13. Sewing and Final Transfer: The controller activates pressure valve #11, causing right-shifting cylinder 702 to retract (at this time, the carriage has lowered, and the high-position locking piece 606 of the subframe engages with the right-shifting cylinder 702), driving the carriage to move to the right carrying the packaged bag. During this process, the sewing machine (with the third switch activated) reinforces the heat-sealed bag opening. Right-shifting cylinder 702 retracts to its endpoint, the sewing is complete, and the carriage is positioned above the conveyor belt.

[0109] S14. Bag Release and Output: The controller controls pressure valve #4 to retract clamp cylinder 402, releasing the bag edge; it also controls pressure valve #5 to retract side-tilting extension cylinder 604, opening the main and auxiliary frames. The packaging bag falls onto the conveyor belt under gravity. The controller activates the first switch, starting the conveyor belt to output the packaging bag.

[0110] S15. System Reset: After the packaging bag is output, the controller controls the #11 pressure-holding valve to extend the right-moving cylinder 702, moving the empty carriage to the left and resetting it to the heat-sealing position; it controls the #6 pressure-holding valve to retract the rail lifting cylinder 502, lowering the carriage to the position where the left-moving cylinder latch can engage with the low-position latch of the main frame. The system's yellow indicator light illuminates, prompting the operator to proceed with the next bagging operation, and the cycle begins.

[0111] Example 3

[0112] This embodiment, based on Embodiment 1, further illustrates how to adapt to packaging bags of different sizes.

[0113] When the size of the packaging bag changes, it can be adjusted in the following ways:

[0114] (1) Bag opening diameter adjustment: The circular cylinder 204 at the lower end of the unloading pipe 201 can be replaced with a sleeve of different outer diameter to adapt to packaging bags of different diameters.

[0115] (2) Bag length adjustment: The positioner 3011 on the cylinder shell of the weighing lifting cylinder 301 is a threaded adjustment structure. Rotating the positioner can change the cylinder extension length, thereby adjusting the lifting height of the lifting tray 302 so that the bottom of the bag is accurately located in the predetermined position.

[0116] (3) Bag width adjustment: The bag stretching cylinder 401 of the clamping and stretching system 400 is a double-outlet cylinder, and its two shafts are respectively connected to the clamping cylinder 402. By controlling the extension length of the stretching cylinder, the spacing of the clamping cylinder 402 can be adapted to different bag widths.

[0117] With the above adjustments, this packaging line can handle various packaging bags with a width of 300~600mm, a length of 500~1000mm, and a mouth circumference of 400~800mm, without the need to replace major components, significantly improving equipment compatibility.

[0118] Example 4

[0119] To verify the technical effect of this invention, a certain type of plastic woven bag was tested using the semi-automatic packaging line described in Example 1. The packaging weight was set to 25 kg, and 100 bags were tested continuously. The test results are as follows:

[0120] Measurement accuracy test: The actual weight statistics of 100 bags showed that the maximum error was +45g and the minimum error was -32g, both within ±50g, with a pass rate of 100%.

[0121] Transfer time test: 10 bags were randomly selected for testing. The average time from filling to the bag reaching the sealing station was 8 seconds.

[0122] Compatibility testing: Nine sizes of packaging bags with widths of 300mm, 450mm, and 600mm, and lengths of 500mm, 750mm, and 1000mm were tested. All bags could be operated stably by adjusting the height of the positioner, replacing the unloading tube sleeve, and adjusting the stroke of the stretching cylinder without replacing any major components.

[0123] Test results show that the present invention has significant advantages in terms of measurement accuracy, transfer efficiency, and equipment compatibility.

[0124] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A semi-automatic packaging line, characterized in that, It includes a packaging line bracket, and a metering and feeding system, a bag holding system, a weighing and bag supporting system, a bag clamping and stretching system, a rail lifting system, a car lifting system, a car moving system, a heat sealing system, a sewing system, a packaging conveying system, a hydraulic station and a controller installed on the bracket; The metering and feeding system, bag holding system, and weighing and supporting system are arranged sequentially along the material flow direction to form a filling and weighing station; the bag clamping and stretching system, heat sealing system, and sewing system are arranged sequentially along the movement direction of the carriage moving system to form a sealing station; the packaging conveying system is set at the end of the sealing station; wherein, the filling and weighing station and the sealing station are connected by the carriage lifting system, the rail lifting system, and the carriage moving system to form a continuous automated packaging process; The metering and feeding system includes a telescopic cylinder top valve, a metering funnel, and a stirring piston valve connected in sequence via a flexible connector; the stirring piston valve includes a stirrer and a piston valve; the extension stroke of the piston valve cylinder shaft of the stirring piston valve is linked to the weight sensor of the metering funnel via a linkage, so that the closing action of the piston valve is synchronized with the material flowing into the packaging bag to reach the set weight. The carriage bag lifting system includes a main frame and a sub-frame that can move along the carriage track, as well as a side-flipping drive mechanism that drives the main frame and the sub-frame to move relative to each other to clamp or release the packaging bag. The carriage moving system includes a first drive mechanism and a second drive mechanism. The first drive mechanism is detachably connected to the main frame, and the second drive mechanism is detachably connected to the sub-frame. The first drive mechanism and the second drive mechanism operate alternately to drive the carriage to move back and forth between the filling station and the sealing station. The rail lifting system is used to lift or lower the car body to achieve the connection and disconnection between the first drive mechanism, the second drive mechanism and the main frame and the sub-frame. The clamping and strapping system is installed on the main frame of the carriage hoisting system; The heat sealing system and the sewing system are arranged sequentially along the moving direction of the carriage moving system; The packaging conveying system is positioned behind the sewing system. The hydraulic station and controller are used to provide power and control for each system.

2. The semi-automatic packaging line according to claim 1, characterized in that, The stirrer includes a stirring chamber, a stirring motor, a stirring shaft, and stirring blades; the upper opening of the stirring chamber is connected to the bottom opening of the metering funnel, and its lower opening is connected to the valve shell of the piston valve; the stirring shaft is transversely inserted into the stirring chamber and is driven by the stirring motor; the stirring blades are fixed on the stirring shaft.

3. The semi-automatic packaging line according to claim 1, characterized in that, The bag holding system includes a discharge pipe and a clamping mechanism; the upper end of the discharge pipe is connected to the outlet of the piston valve, and the outer wall of its lower end is provided with a circular cylinder for fitting the opening of the packaging bag; the clamping mechanism includes two rotating cylinders and two clamping rods; the two rotating cylinders are respectively fixed laterally on the two side walls of the middle part of the discharge pipe, and their shaft ends are connected to the clamping rods to drive the clamping rods to perform clamping or releasing actions.

4. The semi-automatic packaging line according to claim 1, characterized in that, The weighing and palletizing system includes a weighing and lifting cylinder, a lifting tray, and a weighbridge. The weighing and lifting cylinder is installed vertically, with the lifting tray mounted on the top of its shaft. A positioner is provided on its cylinder housing. The weighbridge is placed on the lifting tray, and its weight sensor is electrically connected to the controller.

5. The semi-automatic packaging line according to claim 1, characterized in that, The bag-stretching system includes a bag-stretching deployment cylinder and two clamp cylinders. The bag-stretching deployment cylinder is horizontally mounted on the upper horizontal bar of the main frame, and one clamp cylinder is fixed to each of its two shaft ends. The clamp cylinder is horizontally mounted, and its shaft end is connected to a clamp. The clamp includes a fixed clamp arm and a movable clamp arm that are hinged to each other. The fixed clamp arm is mounted on the cylinder shell of the clamp cylinder, and the movable clamp arm is driven by the extension and retraction of the clamp cylinder shaft to realize the opening and closing of the jaws.

6. The semi-automatic packaging line according to claim 1, characterized in that, The rail lifting system includes two rails and two rail lifting cylinders; the rail lifting cylinders are installed vertically with their shafts facing upward and fixed to a rail support base plate, and the rails are fixedly installed on the rail support base plate through connectors at their ends.

7. The semi-automatic packaging line according to claim 1, characterized in that, The heat sealing system includes two telescopic cylinders and two transverse clamping plates; the telescopic cylinders are arranged with their shafts facing each other, and each shaft is fixed to a transverse clamping plate, and their bases are respectively fixed to the support beam; one of the transverse clamping plates is embedded with a heating wire, and the power line of the heating wire is connected to the second switch of the controller.

8. The semi-automatic packaging line according to claim 1, characterized in that, The sewing machine of the bag sewing system is installed on the right side of the heat sealing system with its seam facing downwards, and its power cord is connected to the third switch of the controller.

9. The semi-automatic packaging line according to claim 1, characterized in that, The packaging conveying system is a conveyor belt, which is installed on the lower right side of the support, with one end extending into the support and located below the cargo box lifting system; the motor power of the conveyor belt is connected to the first switch of the controller.

10. A packaging method based on the semi-automatic packaging line according to any one of claims 1-9, characterized in that, Includes the following steps: (1) In response to the completion of manual bagging and the start signal, open the top valve of the telescopic cylinder and start the agitator to allow the material to flow into the metering funnel; (2) When the weight of the material in the metering funnel is greater than the preset multiple of the set packaging quantity, close the top valve and stop stirring, and send a metering ready signal; (3) In response to the metering ready signal, control the bag holding system to clamp the bag opening and control the weighing and supporting system to rise to support the bottom of the packaging bag; (4) Open the piston valve to fill the material, and control the piston valve to close through the linkage so that the amount of material flowing into the packaging bag accurately reaches the set weight. (5) After the weighing and palletizing system verifies that the weight is qualified and issues a qualified signal, the automatic handover and transfer process of the packaging bags from the filling station to the sealing station is executed, including: The first drive mechanism is controlled to work in coordination with the rail lifting system to position and lift the empty car to the clamp position; The bag clamping and stretching system works in coordination with the car body lifting system to clamp and stretch the packaging bags, and separate them from the bag holding system and the weighing and supporting system. The first drive mechanism is controlled to move the heavy-duty carriage to the location of the heat sealing system. (6) At the sealing station, the heat sealing system and the sewing system are controlled to heat seal and sew the bag opening in sequence; (7) Control the second drive mechanism to move the carriage above the packaging conveyor system and release the packaging bags; (8) executing a system reset procedure, controlling the packaging conveying system to output a packaging bag, and controlling the second driving mechanism and the vehicle track lifting system to move and lower an empty vehicle compartment to a position where the first driving mechanism and the main frame can be connected.

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