Packing machine and packing method thereof

Abstract

The invention relates to packaging operation and equipment, and discloses a packaging machine and a packaging method of the packaging machine. Two cuboid-shaped material boxes with variable volumes are arranged on a rack of the packaging machine side by side; the material box comprises an open box body which is defined by a fixed bottom plate, a fixed side plate, a main push plate and a small push plate, is positioned on the fixed bottom plate and is provided with a discharge hole in one side surface; the top of the box body is an openable cover plate which is adaptive to the maximum volume state of a box body accommodating cavity; the main push plates of the two material boxes are connected with each other and can be simultaneously driven by a compression driving device to synchronously translate on the fixed bottom plate, the distance, closest to the fixed side plate, of the main push plates is smaller than the width of the small push plates, the small push plates of the material boxes are driven by independent bag discharging driving devices respectively, and the rack can be supported by a weighing sensor. The two material boxes can alternately complete the steps of material filling, compression and bag discharging and share one compression driving device, space is saved, the device structure is simplified, cost is reduced, and the device is particularly suitable for being used during quantitative packaging of grass and leaf materials.

Description

TECHNICAL FIELD

[0001] The present application relates to a machine suitable for baling operations of tobacco leaves or the like and a method of operating the same. BACKGROUND

[0002] At present, tobacco, medicinal herbs and the like are often set up corresponding acquisition sites in various places for centralized weighing and acquisition before entering the factory processing stage, and weighing and baling equipment needs to be used.

[0003] A combined tobacco leaf weighing and baling machine is disclosed in CN211268613U, which uses a turnover box and five stations of loading tobacco leaves, weighing, waiting for baling, baling and baling-out to complete the operations of loading, weighing and baling, and the equipment occupies a large area and uses a turnover box.

[0004] A semi-automatic tobacco leaf metering combined baling machine is disclosed in CN220743612U, which includes a hydraulic baling machine including a rack, a support plate, a top frame, a hydraulic device, a compaction device, an adjustable support foot and an electric control box, the adjustable support foot is installed at the four corners of the rack, the support plates are oppositely installed on the left and right sides of the rack, the top end of the support plate is fixedly connected with the top frame, the compaction device and the hydraulic device are installed on the top frame, the hydraulic device provides a power source for the compaction device, and a moving baling box is arranged on the rack, one side of the hydraulic baling machine is provided with an ejection slope, and the other side is further provided with a waiting baling platform, a weighing and metering platform and an inlet slope connected in sequence.

[0005] A combined tobacco leaf weighing and baling machine is disclosed in CN222081008U, which includes a device main body, a weighing and bundling station for weighing and bundling tobacco leaves is arranged on the top surface of the device main body, and a baling station for compressing and baling tobacco leaves in a bundled state is arranged on the top surface of the device main body, the weighing and bundling station is used to complete the weighing and bundling of tobacco leaves, and the bundled tobacco leaves are pushed to the baling station for compression and baling.

[0006] A turnover box type combined tobacco leaf weighing and baling machine is disclosed in CN116062262A, which still has the problems of occupying a large area and using a turnover box.

[0007] A tobacco leaf weighing and baling machine with a sensor separated from a support walking device is disclosed in CN221477809U, which integrates weighing and baling in one device, and the weighing cavity is also the baling cavity, which is more convenient.

[0008] A tobacco leaf packing machine is disclosed in CN216685162U, which is composed of a rack, a fixed bin, a sliding bin, a vertical packing device, a finished product pushing device, and an outlet channel. The sliding bin is provided with a guide rod and a driving mechanism, one side of the finished product pushing device is provided with an automatically retractable sliding door, and the outlet channel is provided with a floating cover plate. The tobacco leaves of a set weight are placed in the bin, the sliding bin is translated to a fixed position, the vertical packing device is compressed downward to pack and form, the sliding bin is withdrawn, the sliding door is extended to fix the tobacco block, the finished product pushing device pushes out the tobacco block, and the tobacco block enters a sack through the outlet channel. The packing machine does not need a turnover box, and the compressed and packed tobacco block directly enters the sack.

[0009] A packing machine is also disclosed in CN222737258U, which compresses tobacco leaves in a horizontal manner, but the operation efficiency still needs to be further improved.

[0010] A tobacco leaf air pressure packing machine is disclosed in CN222109226U, which includes a packing frame and a pressure assembly. The packing machine adopts a double-cavity packing mode, and the pressure assembly for compacting tobacco leaves can rotate. When one working cavity is performing compacting treatment, the other working cavity can perform bundling work. Then, the two working cavities work alternately, so that the packing efficiency is improved.

[0011] An automatic bagging and sealing intelligent tobacco leaf packing machine is disclosed in CN212290484U, which packs and automatically seals the edges of compressed tobacco leaves in cooperation with a tobacco loading vehicle with a movable bottom plate. The mechanism is complex, and it is difficult to keep the sack containing tobacco leaves stable during the edge sealing process.

[0012] In view of the above prior art, it is necessary to design a double-cavity packing machine to improve the packing operation efficiency while trying to reduce the manufacturing cost and facilitate operation. SUMMARY

[0013] The technical problem to be solved by the present application is to provide a packing machine with high operation efficiency and low manufacturing cost and a corresponding packing method.

[0014] The technical scheme adopted by the present application to solve its technical problems is: a packing machine, comprising a rack, a cuboid-shaped variable-volume material box arranged on the rack, two material boxes arranged side by side on the rack, the material box comprising an open box body on the fixed bottom plate and having a discharge port on one side, wherein the fixed side plate is opposite to the main push plate, the small push plate is opposite to the discharge port, the top of the box body is provided with a feeding port, and the feeding port is provided with an openable and closable cover plate matched with the maximum volume state of the box cavity; the main push plates of the two material boxes are connected to each other and can be simultaneously driven by a compression driving device to synchronously translate on the fixed bottom plate, and the small push plates of the two material boxes are respectively driven by independent out-of-box driving devices. In the packing machine with the above structure, when the material in one material box is compressed, the other material box can be discharged, and the same driving device is used to drive the synchronous translation of the main push plates of the two material boxes. The two material boxes are arranged side by side, but the compression direction in the prior art is vertical compression. In this way, the position of the pressing plate and its driving device needs to be repeatedly switched, which is time-consuming and laborious. Horizontal compression with double-material-box driving arrangement utilizes the change of the volume of the double-material-box itself during compression, which saves the size of the whole machine, is more reasonable, the stress on the push plate is more balanced, the stability is better, and the structure is simple and cost-saving. If the two material boxes share one main push plate, although the size of the whole machine is smaller, the driving device of the main push plate can only be placed above the push plate, which inevitably affects the loading and feeding port cover opening and closing of one of the material boxes.

[0015] As described above, in the case of horizontal compression with double-material-box, it is still better to use two main push plates. In order to fully utilize the space of the rack, the compression driving device can be arranged between the two main push plates, and the output shaft of the compression driving device is parallel to the main push plate, which can save more space. In this arrangement, there is no precedent for the arrangement of compression power and transmission. In order to facilitate the arrangement and bear larger torque, the compression driving device is in transmission connection with the first rotating shaft, the first rotating shaft is in transmission connection with the lead screw through the worm gear reducer, and the lead screw is connected between the two main push plates.

[0016] In order to increase the rigidity of the main push plate and facilitate the arrangement and bear larger torque, the compression driving device is in transmission connection with the first rotating shaft, the first rotating shaft is in synchronous connection with the second rotating shaft through the connecting shaft, two lead screws are fixed side by side between the two main push plates, and the first rotating shaft and the second rotating shaft are connected with one of the lead screws through the same worm gear reducer.

[0017] The distance of the main push plate to the fixed side plate is less than the width of the small push plate, so that the main push plate can be withdrawn a certain amount after compressing the material to the limit, the material can expand, and the resistance of the small push plate to the compressed material is greatly reduced. The out-of-box driving device connected to the small push plate can be selected as a small-power driving device, which further saves the cost.

[0018] In order to realize the function of weighing during packing, the frame is supported by a weighing sensor, the weighing sensor, the compression driving device, the ejection driving device and the electric control box are electrically connected, the electric control box is installed on the frame, and a weighing display electrically connected with the weighing sensor is also installed on the frame.

[0019] The application further provides a packing method of the packing machine with the weighing function, which comprises the following steps: The filling step: according to the display of the weighing display, the material to be packed is filled into the hopper in the maximum volume state to a set weight, and the cover plate is closed; The compression step: the compression driving device is started, the main push plate of the hopper is pushed to approach the fixed side plate until a set limit position; The ejection step: the compression driving device is controlled to retreat the main push plate to an ejection position where the main push plate does not interfere with the small push plate and stop, and the ejection driving device is started, and the small push plate pushes the compressed material to the discharge port.

[0020] When the frame is not supported by the weighing sensor, the weighing function is not provided, the weight of the filled material cannot be weighed by the packing machine, but the packing operation efficiency can be improved by alternating use of the two hoppers, and the packing machine can be applied to a place where only packing is required and no weighing is required.

[0021] In order to facilitate packaging of the compressed material, the discharge port is arranged as a rectangular tube in communication with the hopper, the top of the rectangular tube is provided with a bag pressing device, a loading bag is sleeved on the rectangular tube before the material is pushed to the discharge port by the small push plate, and the loading bag is fixed on the rectangular tube by the bag pressing device.

[0022] In order to improve the packing efficiency, after the main push plate of the selected hopper reaches the limit position, the weighing display is used to fill the material to be packed into another hopper to a set weight and close the cover plate of the hopper, and the other hopper performs the compression step and the ejection step.

[0023] The application has the advantages that the two hoppers can alternately complete the material filling and compression and ejection steps, one driving device can be used to complete the compression, space is saved, the device structure is simplified, the cost is reduced, and the application is especially suitable for use in quantitative packing of solid materials such as medicinal herbs and tobacco leaves. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the overall structure of the weighing packing machine according to the application (front view).

[0025] Figure 2 It is a schematic view of the overall structure of the weighing packing machine according to the application from another view (top view) (two cover plates are omitted).

[0026] Figure 3is a schematic view of the overall structure of the weighing packer of the present application from another view (left view) (omitting a cover plate).

[0027] Figure 4 is Figure 3 is a partial enlarged view of the K part in the middle.

[0028] In the figure, the marks are: 1-frame, 2-main push plate one, 3-cover plate one, 4-material box one, 5-small push plate one, 6-handle lock catch, 7-worm and gear reducer, 8-screw rod, 9-coupling, 10-motor, 11-electric push rod one, 12-connecting shaft, 13-weighing display, 14-electric control box, 15-weighing sensor, 16-material box two, 17-small push plate two, 18-electric push rod two, 19-cover plate two, 20-main push plate two, 21-bag pressing device one, 22-bag pressing device two, 23-discharge port one, 24-discharge port two, 25-first rotating shaft, 26-fixed bottom plate, 27-fixed side plate one, 28-fixed side plate two, 29-long guide side plate, 30-short guide side plate, 31-strut, 32-second rotating shaft, d-distance between the main push plate and the fixed side plate when at the limit position, D-small push plate width, δ-retracting distance. DETAILED DESCRIPTION

[0029] The following further illustrates the present application by taking tobacco as the material to be packed, in combination with the drawings and examples.

[0030] Example: As Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a tobacco leaf weighing and packing machine using the structure of the present application comprises a frame 1, the frame 1 comprises four support columns 31, a weighing sensor 15 is installed at the bottom of each support column 31, a support leg with wheels can be additionally installed on the support column 31 and can be turned or retracted relative to the support column, when supported by the wheels, the packing machine can be pushed to move, after moving to the position, the support leg is turned or retracted, the packing machine is supported by the four weighing sensors 15, a weighing display 13 electrically connected with the weighing sensors 15 through a junction box (prior art, not shown in the figure) is also installed on the frame 1, each weighing sensor 15 and the weighing display 13 are independent power supplies, and are separately connected with a 220-volt power supply through the plug of the weighing display 13, at this time, the packing machine is similar to a scale and can be regarded as a weighing device, the support column 31 is fixedly connected with a fixed bottom plate 26, the fixed bottom plate 26 is generally located on the horizontal plane in the working state, on the fixed bottom plate 26, a large cavity is enclosed by a fixed side plate one 27, a long guide side plate 29, a fixed side plate two 28 and a short guide side plate 30 which are perpendicular to the fixed bottom plate 26, the fixed side plate one 27 is parallel to the fixed side plate two 28, the long guide side plate 29 is parallel to the short guide side plate 30 and perpendicular to the fixed side plate one 27, the length of the long guide side plate 29 is substantially equal to the length of the fixed bottom plate 26, and the two ends of the long guide side plate 29 are connected with the fixed side plate one 27 and the fixed side plate two 28, the length of the short guide side plate 30 is shorter, and the two ends of the short guide side plate 30 are arranged between the fixed side plate one 27 and the fixed side plate two 28 to form two openings with equal sizes, respectively, a pressure plate assembly for compressing material is arranged between the long guide side plate 29 and the short guide side plate 30, the pressure plate assembly comprises a main push plate one 2 and a main push plate two 20 which are arranged perpendicularly to the fixed bottom plate 26, the main push plate one 2 and the main push plate two 20 are connected with each other and can be synchronously translated in the direction perpendicular to the fixed side plate under the action of a compression driving device, so as to form two cuboid-shaped material boxes with variable volumes which are arranged side by side in the cavity, and are material box one 4 and material box two 16, respectively; the fixed bottom plate 26 is preferably an integral flat plate, so as to reduce the resistance or possible jamming of the main push plate; The material box one 4 comprises an open box body which is enclosed by the fixed bottom plate 26, the fixed side plate one 27, the main push plate one 2 and a small push plate one 5, the fixed side plate one 27 is opposite to the main push plate one 2, the small push plate one 5 is installed on the inner side of the long guide side plate 29 in parallel to the long guide side plate 29 and is driven by an electric push rod one 11, the small push plate one 5 is opposite to a discharge port one 23 which is a rectangular tube connected on the fixed side plate one 27 and the short guide side plate 30, a feeding port is arranged at the top of the box body, the feeding port is provided with an openable and closable cover plate one 3 which is adapted to the maximum volume state of the cavity of the box body, the cover plate one 3 can be locked to close the feeding port by a handle lock catch 6 fixed around the feeding port, and the cover plate one 3 can be lifted by rotating the handle lock catch 6 to open the feeding port; The material box two 16 includes an open box, which is surrounded by a fixed bottom plate 26, a fixed side plate two 28, a main push plate two 20 and a small push plate two 17. The fixed side plate two 28 is opposite to the main push plate two 20, and the small push plate two 17 is installed on the inner side of the long guide side plate 29 in parallel to the long guide side plate 29 and is driven by the electric push rod two 18. The small push plate two 17 is opposite to the discharge port two 24, which is a rectangular pipe connected to the fixed side plate two 28 and the short guide side plate 30. Another feeding port is also provided at the top of the box, which is provided with a closable cover plate two 19 adapted to the maximum volume of the cavity of the box. The cover plate one 3 and the cover plate two 19 can be locked by the handle lock catch 6 fixed around the corresponding feeding port to close the feeding port. The handle lock catch 6 can be turned to lift the cover plate and open the feeding port. The top of the discharge port one 23 is provided with a bag pressing device one 21, and the top of the discharge port two 24 is provided with a bag pressing device two 22, which is used to fix the loading bag when the loading bag is sleeved on the discharge port to prepare to receive tobacco leaves. Specifically, the bag pressing device can adopt a pressing rod hinged on the top surface of the rectangular pipe. As shown in Figure 2 , Figure 3 and Figure 4 , the pressing plate assembly includes the main push plate one 2 and the main push plate two 20, the first rotating shaft 25 and the second rotating shaft 32. The main push plate one 2 and the main push plate two 20 are connected to each other and driven by the same electric motor 10. The first rotating shaft 25 and the second rotating shaft 32 are coaxially arranged with the output shaft of the electric motor 10. The main push plate one 2 and the main push plate two 20 are connected by two parallel lead screws 8. The electric motor 10 as a compression driving device is transmissionally connected with the first rotating shaft 25 through a shaft coupling 9. The first rotating shaft 25 is transmissionally connected with one of the lead screws 8 through a worm gear reducer 7. The second rotating shaft 32 is transmissionally connected with the other one of the lead screws 8 through another worm gear reducer 7. The first rotating shaft 25 and the second rotating shaft 32 are synchronously connected through a connecting shaft 12 and shaft couplings 9 at both ends of the connecting shaft 12. The connecting shaft 12 is a synchronous shaft of the two lead screws 8. The structural design of the pressing plate assembly is more labor-saving compared with the rotating compression assembly of the existing design CN222109226U. Only the left and right translation of the main push plate is driven by the rotation of the lead screw. After the electric motor 10, the reducer and the synchronous shaft are installed, the spatial position does not need to be changed in use, which is more simple and practical, and easy to maintain and use.

[0031] Under the drive of the motor 10, the main push plate one 2 and the main push plate two 20 can move left and right on the fixed bottom plate 26 between the long guide side plate 29 and the short guide side plate 30, the overall strength and rigidity are good, and the movement of the main push plate on the fixed bottom plate is not easy to be deflected; when one side of the material box cover plate is closed and the tobacco is compressed, the volume of the other side of the material box is increased, the cover plate can be opened to fill the material to the other side of the material box, and the two material boxes work alternately to improve the packing efficiency; in the embodiment, due to the characteristics of the tobacco itself, one end of the discharge port is open and not closed, and the air in the tobacco can be discharged through the discharge port during the compression process, and the tobacco will not leak to the discharge port during the compression process; the distance d reached by the main push plate to the closest fixed side plate is less than the width D of the small push plate, that is, according to the characteristics of the tobacco, the tobacco is compressed to the limit when the distance between the main push plate and the corresponding fixed side plate is d, and the tobacco package is formed, at this time, the volume of the tobacco package reaches the minimum, if the main push plate is not slightly withdrawn, the small push plate will bear a relatively large resistance when pushing the tobacco package, but at this time, the main push plate is withdrawn by a certain distance, the tobacco will expand due to the withdrawal, and the resistance borne by the small push plate will be significantly reduced, therefore, the small push plate can use a small-power driving device, thereby reducing the power required by the entire packing machine and reducing the manufacturing cost, in the embodiment, an electric push rod is selected as the driving device of the small push plate, that is, the bale-out driving device, obviously, other devices can also be used to drive the small push plate in cooperation with a transmission mechanism. Figure 2 In the embodiment, the position of the main push plate one 2 shown by the double-dot line is the limit position of the material box one 4, and the position of the main push plate one 2 shown by the solid line is the bale-out position of the material box one 4, and the material box two 16 is the same.

[0032] For convenient control, the motor 10, the electric push rod one 11 and the electric push rod two 18 are electrically connected with the electric control box 14. The pushing directions of the electric push rod one 11 and the electric push rod two 18 can be the same or opposite, which is determined according to the arrangement direction of the discharge ports of the two material boxes. The electric control box 14 is installed on the frame 1. The electric control box 14 is externally connected with a control switch through necessary lines so as to start the main push plate through the control switch. However, the advancing and retracting of the main push plate are automatically controlled by the electric control box 14. After the main push plate reaches the limit position, the motor 10 reverses immediately, and the main push plate automatically starts to retract. When the main push plate reaches the retraction distance δ, the main push plate stops, and the electric push rod is automatically started. The small push plate pushes out the material immediately. At this time, the rectangular tube has been loaded with a loading bag, and the cigarette packet is pushed out of the rectangular tube and gradually falls into the loading bag under the action of the gravity of the material. The loading bag is automatically extended and contains the material. The loading bag and the cigarette packet fall down under the action of the gravity, realize the overturning of the bag, save a material overturning mechanism, and the small push plate automatically retracts and resets after the cigarette packet is completely pushed out. At this time, the main push plate has completed the reversing. After the other material box is filled and the closure cover is closed, the main push plate can be restarted through the control button to compress and pack the other material box, so that the operation is more convenient. The sizes of the material box, the main push plate and the small push plate can be reasonably determined according to the packing size requirements and the different states of the material volume during quantitative packing. The retraction distance δ can be adjusted within a certain small range according to the different materials, so as to achieve the most suitable degree and ensure the consistency of the quantitative material compression degree. The automatic control of the retraction distance is relatively simple. The motor 10 control circuit is provided with a time delay device, so as to realize the automatic control. The above automatic control can also be realized by the conventional PLC technology after understanding the control logic and process. Therefore, only the action process is introduced, and the packing method is described in detail below.

[0033] REFERENCE Figures 1 to 3With the above introduction of the packing method of the present application, the packing method of the tobacco leaf weighing and packing machine is as follows: the whole packing machine is in the initial state, one of the hoppers 4 is in the maximum volume state, the small push plates of the two hoppers are in the position farthest from the discharge port, the weighing display 13 is cleared, the dead weight of the packing machine does not affect the weighing display, which is convenient for observation, the hopper one 4 is filled with tobacco leaves to the set weight displayed by the weighing display 13, that is, the hopper one 4 has been filled with the set weight of tobacco leaves, at this time, the cover plate one 3 is closed; then, the control switch of the pressing plate assembly is pressed, the motor 10 is started, the main push plate one 2 approaches the corresponding fixed side plate one 27, the tobacco leaves are gradually compressed, when reaching the limit position, the main push plate one 2 stops moving under the control of the electric control box 14, the motor 10 reverses, the main push plate one 2 starts to retreat, when the retreat distance reaches δ, the motor 10 stops, the electric push rod one 11 extends, the small push plate one 5 pushes out the tobacco leaves to the discharge port, during the process from closing the cover plate to the action of the small push plate, the filling bag is sleeved on the discharge port 23, the filling bag receives the tobacco leaves pushed out from the discharge port 23, after the small push plate one 5 reaches the limit position, it automatically retreats to the initial state position to wait for the next action; after the hopper one 4 is closed, the cover plate two 19 can be opened to fill the hopper two 16 with tobacco leaves, when the weighing display 13 displays the set weight twice, that is, the hopper two 16 has been filled with the set weight of tobacco leaves, the cover plate two 19 can be closed, after the discharge of the material in the hopper one 4 is completed, the control switch of the pressing plate assembly is pressed again to start the compression process of the hopper two 16, and the process is repeated.

[0034] It can be seen that the use of the tobacco leaf weighing and packing machine can multiply the packing efficiency, the weighing process is completed together with the filling process, the material is not transferred from the weighing device to the packing device, and only one button switch, that is, the control switch of the pressing plate assembly, is needed for whole process control, which is simple and convenient to operate. In addition, the electric control box 14 generally should be provided with a power supply main switch.

[0035] Obviously, the packing machine of the present application can not only be used for packing tobacco leaves, but also can be used for packing other materials with similar characteristics, such as packing of herbs and fallen leaves with economic value, so as to facilitate centralized utilization. The present application also has use value for forestry resource development.

Claims

1. A baling machine, comprising a frame (1), wherein a cuboid-shaped variable-volume hopper is disposed on the frame (1), characterized in that: Two material boxes are arranged side by side on the frame (1). Each material box includes an open box body located on the fixed base plate (26) and having a discharge port on one side, which is surrounded by a fixed base plate (26), a fixed side plate, a main push plate and a small push plate. The fixed side plate is opposite to the main push plate, and the small push plate is opposite to the discharge port. The top of the box body is provided with a feed port, which is equipped with an openable cover plate adapted to the maximum volume of the box body cavity. The main push plates of the two material boxes are connected to each other and can be driven by a compression drive device to move synchronously on the fixed base plate. The small push plates of the two material boxes are driven by independent packing drive devices.

2. The packaging machine as described in claim 1, characterized in that: The compression drive device is connected to the first rotating shaft (25) for transmission. The first rotating shaft (25) is connected to the lead screw (8) through the worm gear reducer (7). The lead screw (8) is connected between the two main push plates.

3. The packaging machine as described in claim 1, characterized in that: The compression drive device is connected to the first rotating shaft (25) for transmission. The first rotating shaft (25) is synchronously connected to the second rotating shaft (32) through the connecting shaft (12). Two lead screws (8) are fixed side by side between the two main push plates. The first rotating shaft (25) and the second rotating shaft (32) are respectively connected to one of the lead screws (8) through the same worm gear reducer (7).

4. The packaging machine as described in claim 1, 2, or 3, characterized in that: The closest distance that the main push plate can reach to the fixed side plate is less than the width of the small push plate.

5. The packing method of the packing machine according to claim 4, characterized in that: The frame (1) is supported by a weighing sensor (15), which is electrically connected to a weighing display (13). The compression drive and the bag-out drive are electrically connected to the electrical control box (14). The electrical control box (14) and the weighing display (13) are both mounted on the frame (1). The process includes the following steps: Filling steps: According to the display of the weighing display (13), fill the material to be packaged into the hopper at its maximum volume to the set weight, and close the cover. Compression step: The compression drive device is started, pushing the main push plate of the hopper close to its fixed side plate until the set limit position is reached; Unpacking steps: Control the compression drive device to retract the main push plate to the unpacking position where it does not interfere with the small push plate and stop. Start the unpacking drive device and push the small push plate out the compressed material to the discharge port.

6. The packaging method as described in claim 5, characterized in that: The discharge port is configured as a rectangular tube connected to the box body. A bag pressing device is provided at the top of the rectangular tube. Before the small pusher plate pushes the material to the discharge port, a material bag is put onto the rectangular tube. The material bag is fixed on the rectangular tube by the bag pressing device.

7. The packaging method as described in claim 5 or 6, characterized in that: After the main push plate of the selected material box reaches the limit position, according to the display of the weighing display (13), the material to be packaged with a set weight is filled into another material box and its cover is closed. The other material box performs the compression step and the unpacking step.

8. The packaging method of the packaging machine as described in claim 4, characterized in that: Includes the following steps: Filling steps: Fill the hopper with the material to be packaged into the hopper at its maximum capacity and close the cover; Compression step: The compression drive device is started, pushing the main push plate of the hopper close to its fixed side plate until the set limit position is reached; Unpacking steps: Control the compression drive device to retract the main push plate to the unpacking position where it does not interfere with the small push plate and stop. Start the unpacking drive device and push the small push plate out the compressed material to the discharge port.

9. The packaging method of the packaging machine as described in claim 8, characterized in that: After the main push plate of the selected material box reaches the limit position, the material to be packaged is filled into another material box and its cover is closed. The other material box then performs the compression step and the unpacking step.

10. The packaging method as described in claim 8 or 9, characterized in that: The discharge port is configured as a rectangular tube connected to the box body. A bag pressing device is provided at the top of the rectangular tube. Before the small pusher plate pushes the material to the discharge port, a material bag is put onto the rectangular tube. The material bag is fixed on the rectangular tube by the bag pressing device.

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