Packaging machine suitable for bag making, filling and sealing of straight roll film material

Abstract

The utility model discloses a packaging machine suitable for bag making, filling and sealing of a straight roll film material. A method of the packaging machine comprises the following process steps of (1) bag feeding, (2) bag grabbing, (3) bag sleeving, (4) bag making, (5) bag opening, (6) filling, (7) sealing and (8) bag falling. The bag opening and sealing device structurally comprises a bag feeding mechanism, a cutter pair, a sealing pair, a bag shoulder clamping finger, a bag opening expansion nozzle, a feeding hopper, a lifting mechanism and a film supply assembly, bag opening is kept mainly through a plug core, a front profile modeling and a rear profile modeling, and the sealing pair and the cutter pair can be separated, so that the sealing pair can seal a bag opening and a bag bottom; the bag shoulder clamping fingers which are in bilateral symmetry are controlled along a track groove of the lifting mechanism to complete a series of complex procedures, and automatic material packaging is achieved through a straight roll film material by means of optimized part structures and process control.

Description

Technical Field

[0001] This utility model relates to a packaging machine suitable for making bags, filling and sealing straight roll film materials, which can realize the automated process. Background Technology

[0002] There are many types of automatic packaging machinery for single-sheet film materials, multi-sheet film materials, and pre-made bags. However, straight roll film materials can only be used as raw materials for bag making or as manual packaging materials. There are relatively few automatic packaging machines that can directly utilize this material. Patent CN216468822U is also an auxiliary bagging machine that can only use pre-opened straight roll film materials. A more common example is the FFS heavy film bag making packaging machine described in patent CN119503235A, which has a complex structure, high cost, and is mainly used in the field of industrial chemical packaging. Utility Model Content

[0003] This utility model relates to a packaging machine suitable for making bags, filling and sealing straight roll film materials. It has a simple structure, is economical and practical, and can automatically package common agricultural products such as pellet feed, small vegetables and fruits, and some industrial raw materials.

[0004] This utility model includes the following process steps:

[0005] (1) Bag loading: The bag opening is manually removed from the film supply assembly and placed between the front and rear molds of the bag loading mechanism, and the bag opening is fixed by the weight of the middle plug.

[0006] (2) Grip the bag: Move the bag shoulder gripper down to the gripping position point (a) and insert it into the concave notch on both sides of the front and back of the bag opening to grip the bag shoulder.

[0007] (3) Bag fitting: The shoulder gripper grabs the shoulder of the bag and slips it onto the bag opening expansion nozzle. At this time, the bag is in the straight film (C) state.

[0008] (4) Bag making: The shoulder gripper grabs the shoulder of the bag and moves it upwards a certain distance to reach the bag making position (b). The sealing part is closed for the first time to complete the heat sealing of the bottom of the bag. At the same time, the cutting part closes and cuts off the bottom of the bag, completing the bag making action. At this time, the bag is in the empty bag (N) state.

[0009] (5) Opening the bag: The bag shoulder gripper continues to move the bag shoulder upwards to the material filling position point (c). Due to the relative insertion of the feed hopper, the bag opening is opened by the passive resistance of the expansion nozzle.

[0010] (6) Filling: The material enters the bag from the feed hopper and is quantitatively filled. At this time, the bag is in the full bag (F) state and the sealing part is in the initial retraction state; the bag feeding mechanism and the cutter part retract to make way for the material drop channel when the bag is full (F).

[0011] (7) Sealing: The shoulder clip is lowered to the heat-sealing position (d) at the bag opening; the sealing pair is closed again to complete the bag sealing process.

[0012] (8) Dropping the bag: The sealing lining is opened again, the shoulder clip is opened, and the full bag (F) drops.

[0013] (9) Repeat steps (2) to (8) to achieve automated packaging.

[0014] This utility model comprises: a bag-loading mechanism, a cutting assembly, a sealing assembly, bag shoulder grippers, a bag opening expansion nozzle, a feeding hopper, a lifting mechanism, and a film supply assembly. The cutting assembly is mounted on the bag-loading mechanism, the sealing assembly is located above the cutting assembly, the bag shoulder grippers are symmetrically mounted on the lifting mechanism, the bag opening expansion nozzle is also mounted on the lifting mechanism, the feeding hopper is located above the lifting mechanism, and the film supply assembly is located below the lifting mechanism. The bag-loading mechanism is characterized in that: the bag opening is fixed to prevent slippage by a stopper core and front and rear templates; the stopper core keeps the bag opening open. When the bag opening rises, the bag opening expansion nozzle is inserted. The bag feeding mechanism and the cutter assembly share a set of cylinders for forward extension and backward retraction. The sealing assembly and the cutter assembly are separate, but when the cutter assembly is directly below the sealing assembly, they share a set of closing devices. The bag shoulder grippers are symmetrically installed on the left and right sides of the bag opening expansion nozzle and are mounted together on the lifting mechanism. A pair of bag shoulder grippers guide the lifting mechanism to rise and fall along the track groove while separating to the left and right or moving closer to the center. The bag opening expansion nozzle is opened by the passive resistance of the insertion of the feed hopper and maintains synchronous opening and closing by the meshing of the gear pair on the edge of the nozzle.

[0015] The bag-loading mechanism includes a plug, front and rear molds for the bag opening, and a cylinder drive structure. The plug is placed in the middle of the bag opening, and its own weight presses down on the bag opening to prevent it from slipping. At the same time, there are gaps between the plug and the front and rear molds for the bag opening, so that the bag opening will not be stuck when it is lifted up. After the front and rear molds for the bag opening are closed, there is an opening size for the plug in the middle, and there are concave notches on both sides, so that the shoulders of the fixed bag opening are exposed, making it easy for the bag shoulder gripper to insert and grab. Furthermore, the cross-section of the plug has a certain width, which keeps the middle of the bag opening in an open state. The entire bag-loading mechanism can be extended forward to the bag filling axis position (I) or retracted to the off-center position (II) at the same time as the cutting blade through the extension and retraction action of the cylinder.

[0016] The cutting assembly includes front and rear blade seats and guide pins. Multiple compression springs are located between the blade seats and guide pins to keep the front and rear blade seats elastically opening and closing. At the same time, the upper part of the rear blade seat is equipped with a blade and a blade end pressure strip. Multiple spring plates are located between the two to allow the blade to cut the bag opening after the pressure strip presses down on the bag.

[0017] The sealing assembly includes a heating strip installed in the heating groove and embedded in the relative positions of the front and rear fixing rods. When the cylinder assembly pushes the rear fixing rod and the front fixing rod to close and complete the heat sealing of the bag bottom, the front fixing rod and the rear fixing rod push against the front blade seat and the rear blade seat located at the bag filling axis position (I) respectively, causing the cutting assembly to close, cutting off the bottom tail of the bag, and completing the bag making action.

[0018] The bag shoulder clamping fingers are contained in a cylinder body, which simultaneously includes a rear piston rod and a front piston rod that are respectively connected to the front and rear clamping fingers. There is an air inlet in the center of the cylinder body. After compressed air is filled in, the front and rear clamping fingers clamp together. A compression spring is installed between the front and rear clamping fingers so that the bag shoulder clamping fingers can open and return to their original position. There are clearance gaps in the middle of the clamping sections of the front and rear clamping fingers to avoid the bag positioning clips on the front and rear molds of the bag opening.

[0019] The bag opening expansion nozzle includes front and rear expansion nozzle pieces mounted on a fixed frame. It opens and closes synchronously by the meshing of gear pairs on the edge of the nozzle jaws and returns to the closed state by the tension spring. The bag opening expansion nozzle is fixed on the lifting mechanism. When it moves upward with the lifting mechanism, the bag opening expansion nozzle opens due to the passive resistance caused by the insertion of the feed hopper. At the same time as it opens, the front and rear expansion nozzle pieces resist the bag opening pressure spring and press down on the front and rear edges of the bag opening.

[0020] The lifting mechanism includes a lifting plate and a linear motion mechanism. The lifting plate is symmetrically positioned on the left and right sides and forms a parallelogram structure with a straight pin, a swing arm and a connecting pin to connect a pair of bag shoulder grippers and a limiting roller. The limiting roller guides the movement of the bag shoulder grippers along the track groove of the limiting guide plate. When the grippers move downward, they grip the bag opening and separate to the left and right. When the grippers move upward, the bag opening moves closer to the center. In addition, multiple optical fork sensors are installed to detect the position of the bag shoulder grippers.

[0021] The film supply assembly includes a straight roll of film material (C) placed on a roll hanging rod by means of a roller shaft, and an electric roller and a pressing roller are provided at the extended end of the roll to assist in film output.

[0022] The beneficial effects of this invention are as follows: the bag opening is maintained by the plug core and the front and rear molds, eliminating the need for the commonly used complex vacuum adsorption bag opening mechanism; the separable structure of the sealing assembly and the cutting assembly allows one sealing assembly to seal both the bag opening and the bag bottom; the left and right pair of bag shoulder grippers, controlled by the trajectory groove of the lifting mechanism, can move up and down while separating to the left and right or moving closer to the center, thus cooperating with other components to complete a series of complex processes such as bag loading, bag opening, bag making, filling, sealing, and bag dropping; the bag opening expansion nozzle is passively opened by the insertion of the feeding hopper and the expansion is kept synchronous by the meshing of the gear pair, also eliminating the need for a complex front and rear opening and closing structure for the expansion nozzle; in summary, the optimized part structure and process control enable the use of straight roll film material to complete automated packaging of materials. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a structural diagram of the bag-loading mechanism and the cutter assembly.

[0025] Figure 3 This is a structural diagram of the sealing assembly.

[0026] Figure 4 This is a schematic diagram of the shoulder clip structure.

[0027] Figure 5 This is a schematic diagram of the structure of the bag opening expansion nozzle.

[0028] Figure 6 This is a structural diagram of the lifting mechanism.

[0029] Figure 7 This is a schematic diagram of the membrane supply assembly.

[0030] Figure 8 This is a schematic diagram of the bag-making process.

[0031] Figure 9 This is a schematic diagram of the bag gripping and bottom sealing process.

[0032] Figure 10 This is a schematic diagram of the process of opening the expansion nozzle and filling materials.

[0033] Figure 11 This is a schematic diagram of the bag sealing process.

[0034] Figure 12 This is a schematic diagram of the full-bag production process.

[0035] Reference numerals: Bag upper mechanism (1), plug core (101), bag opening rear template (102), bag opening front template (103), cylinder fixing plate (104), guide rod (105), cutter pair (2), front blade holder (201), rear blade holder (202), blade (203), blade end pressure strip (204), guide pin (205), compression spring (206), spring plate (207), sealing pair (3), heating strip (301), heating groove (302), rear fixing rod (303), front fixing rod (304), guide rod (305), guide rod fixing block (306), bag shoulder gripper finger (4), cylinder body (401), mounting base (402), rear piston rod (403), connecting piece (404), front piston rod (405), connecting rod (406), rear gripper finger (407), compression spring (408), front gripper finger (409), spring pressure plate (410), snap ring (411), sealing ring (412), bag opening expansion nozzle (5), front piece of expansion nozzle (501), rear piece of expansion nozzle (502), tension spring (503), bag opening compression spring (504), fixing frame (505), connecting slide column (506), connecting rod (507), feed hopper (6), lifting mechanism (7), lifting plate (701), linear motion mechanism (702), light fork sensor (703), limit guide plate (704), straight pin (705), swing arm (706), connecting pin (707), limit roller (708), limit pin (709), photoelectric stop block (710), film supply assembly (8), electric roller (801), pressure roller (802), horizontal mounting rod (803), film roll hanging rod (804), idler roller shaft (805), idler roller (806). Detailed Implementation

[0036] To make the technical problems to be solved, the technical solutions and the beneficial effects of this application clearer, the following detailed description of this application is provided in conjunction with the accompanying drawings.

[0037] It should be noted that when a component is described as being "mounted on", "fixed on", or "placed on" another component, it can be directly on the other component or indirectly on that other component.

[0038] It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "middle", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] In addition to the lead screw and nut drive mentioned in the text, the meaning of "linear motion mechanism" still includes common synchronous belt, belt, chain, gear rack or cylinder drive.

[0040] For a detailed embodiment of this utility model, see [link to specific implementation details]. Figures 1 to 12 A packaging machine suitable for making bags, filling, and sealing straight roll film materials, comprising the following process steps:

[0041] (1) During the first operation, the film opening is taken out from the film supply assembly (8) and placed between the bag opening back mold (102) and the bag opening front mold (103) of the bag opening mechanism (1). The plug (101) is placed in the middle of the bag opening. After the front and rear molds of the bag opening are closed, the bag opening is fixed in place by the weight of the plug (101) in the middle. At this time, the bag opening is flush with the mold. By relying on the certain thickness of the plug (101) and the shape of the front and rear molds (102) of the bag opening, the bag opening always maintains the state that its cross-section is open in the middle and closed on both shoulders. After the film opening bag process is completed, the film supply assembly (8) supplies film according to the packaging procedure.

[0042] (2) The upper bag mechanism (1) extends forward to the bag filling axis position (I) through the cylinder, and the bag shoulder gripper (4) moves down to the upper bag mechanism (1) above the bag opening, that is, the bag gripping position point (a), through the lifting mechanism (7) to grip the bag shoulder at the concave notch of the mold before and after the bag opening.

[0043] (3) When the shoulder gripper (4) grabs the shoulder of the bag and moves it upward, the bag opening is in the middle and can be put onto the bag opening expansion nozzle (5). At this time, the bag is in the straight film (C) state.

[0044] (4) The shoulder gripper (4) grabs the shoulder of the bag and moves it upwards for a distance, which is the pre-made length of the bag, until it reaches the bag making position (b). The sealing part (3) closes for the first time to complete the heat sealing of the bottom of the bag. At the same time, the blade (203) of the cutting part (2) and the front blade seat (201) also close under the cylinder drive of the sealing part (3) to cut off the bottom of the bag and complete the bag making action. At this time, the bag is in the empty bag (N) state. It must be noted that the length of the bag can be changed by changing the height of the bag making position (b).

[0045] (5) The shoulder gripper (4) grabs the shoulder of the bag and moves it upward to the material filling position (c). Due to the guiding effect of the track groove of the limiting guide plate (704), the shoulder gripper (4) moves closer to the middle, completing the inward movement of the shoulder of the bag and the middle of the bag opening expands. At this time, the bag opening expansion nozzle (5) that moves together with the shoulder gripper (4) also touches the feed hopper (6). Due to the relative insertion of the feed hopper (6), the bag opening expansion nozzle (5) is passively resisted and opened. At the same time as it opens, the front piece (501) and the rear piece (502) of the expansion nozzle each resist the bag opening pressure spring (504) and press down the front and rear edges of the bag opening.

[0046] (6) The material enters the bag from the feed hopper (6) and is quantitatively filled. At this time, the bag is in the full bag (F) state and the sealing part (3) is in the initial retraction state. The bag loading mechanism (1) and the cutter part (2) are retracted to the deviation position (II) by the cylinder to make way for the material drop channel of the full bag (F).

[0047] (7) The shoulder clip (4) is lowered to the heat-sealing position (d) of the bag opening; the sealing part (3) is closed again to complete the bag sealing process.

[0048] (8) The sealing liner (3) is opened again, the shoulder clip (4) opens the shoulder, and the full bag (F) falls down.

[0049] (9) Repeat steps (2) to (8) to achieve automated packaging.

[0050] A packaging machine suitable for making, filling, and sealing bags from straight roll film materials, comprising: a bag-raising mechanism (1), a cutter assembly (2), a sealing assembly (3), a bag shoulder gripper (4), a bag opening expansion nozzle (5), a feeding hopper (6), a lifting mechanism (7), and a film supply assembly (8). The bag-raising mechanism (1) is equipped with the cutter assembly (2), the sealing assembly (3) is located close to the cutter assembly (2), the bag shoulder gripper (4) is symmetrically mounted on the lifting mechanism (7), the bag opening expansion nozzle (5) is also mounted on the lifting mechanism (7), the feeding hopper (6) is located above the lifting mechanism (7), and the film supply assembly (8) is located below the lifting mechanism (7). The bag-raising mechanism (1) is characterized by using a stopper core and front and rear templates to prevent the bag opening from slipping. The plug core keeps the bag mouth open so that it can be inserted into the bag mouth expansion nozzle (5) when the bag mouth rises. The bag upper mechanism (1) and the cutter pair (2) share a set of cylinders for forward extension and backward retraction. The sealing pair (3) and the cutter pair (2) are separate, but the cutter pair (2) shares a set of closing device when it is directly below the sealing pair (3). The bag shoulder grippers (4) are symmetrically located on the left and right sides of the bag mouth expansion nozzle (5) and are mounted together on the lifting mechanism (7). The pair of bag shoulder grippers (4) are guided to rise and fall along the track groove of the lifting mechanism (7) while separating to the left and right or moving closer to the middle. The bag mouth expansion nozzle (5) is opened by the passive contact of the insertion of the feed hopper (6) and the opening and closing are kept synchronous by the meshing of the gear pair on the edge of the nozzle.

[0051] The bag-loading mechanism (1) includes a plug (101), a rear bag opening mold (102), and a front bag opening mold (103). The plug (101) has an X-shaped cross-section with concave sides (inverted triangle and wedge are consistent descriptions). The rear bag opening mold (102) and the front bag opening mold (103) have convex cross-sections. The bag opening is placed between the rear bag opening mold (102) and the front bag opening mold (103). The plug (101) is placed in the middle of the bag opening, and the weight of the plug (101) presses down on the bag opening to prevent it from slipping. There are gaps between the plug core (101) and the bag opening back mold (102) and the bag opening front mold (103), so that the bag opening will not be stuck when it is lifted up. After the bag opening back mold (102) and the bag opening front mold (103) are closed, the size of the opening of the plug core (101) is left in the middle, and the size of the concave notch is left on both sides, so that the shoulders of the bag opening after it is fixed are exposed, making it easy for the bag shoulder gripper (4) to insert and grab. Furthermore, the cross section of the plug core (101) has a certain width, and this width keeps the middle of the bag opening in an open state.

[0052] The bag-loading mechanism (1) also includes a cylinder fixing plate (104) and a guide rod (105). The bag opening rear template (102) and the bag opening front template (103) are both mounted on the guide rod (105). Through the extension and retraction of the cylinder, the bag-loading mechanism (1) and the cutter pair (2) can simultaneously extend forward to the bag filling axis position (I) or retreat to the offset position (II).

[0053] The cutter assembly (2) includes a front blade holder (201) mounted on the upper part of the front support mold (103) of the bag opening. The front blade holder (201) is threaded onto a guide pin (205), which is inserted into the side of the front support mold (103) of the bag opening. A compression spring (206) is installed in the guide pin (205) and the front blade holder (201) to keep the front blade holder (201) elastically opening and closing. The cutter assembly (2) also includes a rear blade holder mounted on the upper part of the rear support mold (102) of the bag opening. 202), the rear blade holder (202) is threaded onto the guide pin (205), the guide pin (205) is inserted into the side of the back mold (102) behind the bag opening, the guide pin (205) and the rear blade holder (202) are equipped with compression springs (206) to keep the rear blade holder (202) elastically open and close, the upper part of the rear blade holder (202) is equipped with a blade (203), the lower side of the blade (203) is equipped with a spring plate (207), and the spring plate (207) is connected to the blade end pressure strip (204).

[0054] The sealing assembly (3) includes a heating strip (301) fixed on a heating groove (302), the heating groove (302) being embedded in the opposite positions of the rear fixing rod (303) and the front fixing rod (304), two parallel guide rods (305) being inserted into the sides of the rear fixing rod (303) and the front fixing rod (304), the guide rods (305) being fixed on the guide rod fixing block (306), the rear fixing rod (303) being driven forward by a cylinder, and the front fixing rod (304) being driven backward by cylinders on both sides. When the cylinder assembly in the sealing assembly (3) pushes the rear fixing rod (303) and the front fixing rod (304) to close and seal the bottom of the bag, the cutting assembly (2) closes and cuts off the bottom of the bag by the pushing action of the front blade seat (201) and the rear blade seat (202) located at the bag filling axis position (I), respectively.

[0055] The bag shoulder gripper (4) includes a cylinder body (401) containing a front piston rod (405) and a rear piston rod (403). The front piston rod (405) is connected to the rear gripper (407), and the rear piston rod (403) is connected to the front gripper (409) via a connecting rod (406) and a connecting piece (404). The front piston rod (405) is limited by a retaining ring (411), and the rear piston rod (403) is limited by a mounting base (402). Both the front piston rod (405) and the rear piston rod (403) have... Equipped with a sealing ring (412), the front clamping finger (409) and the rear clamping finger (407) have a gap to avoid the bag-pressing positioning card on the bag opening back mold (102) and the bag opening front mold (103). A compression spring (408) and a spring pressure plate (410) are installed between the front clamping finger (409) and the rear clamping finger (407) to reset the opening of the bag shoulder clamping finger (4). There is an air inlet in the center of the cylinder body (401). After compressed air is filled in, the front clamping finger (409) and the rear clamping finger (407) clamp together.

[0056] The bag opening expansion nozzle (5) includes a fixed frame (505) which is fixed to the lifting mechanism (7) by connecting slide (506) and connecting rod (507). The front piece (501) and the rear piece (502) of the expansion nozzle are installed on the fixed frame (505). The front piece (501) and the rear piece (502) of the expansion nozzle open and close synchronously by relying on the meshing of the gear pair on the edge of the nozzle. The tension spring (503) is used to tighten and restore the closed state. When the bag opening expansion nozzle (5) moves upward with the lifting mechanism (7), the bag opening expansion nozzle (5) is passively resisted and opened due to the insertion of the feed hopper (6). At the same time as it opens, the front piece (501) and the rear piece (502) of the expansion nozzle resist the bag opening pressure spring (504) and press down the front and rear edges of the bag opening.

[0057] The feed hopper (6) is provided with exhaust jackets on both sides.

[0058] The lifting mechanism (7) includes a lifting plate (701) and a linear motion mechanism (702) driven by a motor-driven screw nut transmission structure on a linear guide slider pair. The shoulder gripper (4) is fixed to two swing arms (706) by two straight pins (705). The two swing arms (706) are fixed to the lifting plate (701) by two connecting pins (707). The two straight pins (705), two swing arms (706), and two connecting pins (707) form a parallelogram structure, enabling the shoulder gripper (4) to move horizontally left and right. At the same time, limit pins (709) and limit rollers are installed on the edge of the shoulder gripper (4). 708), the limiting roller (708) guides the bag shoulder gripper (4) to move along the limiting guide plate (704) which has been machined with a track groove. The bag shoulder gripper (4) is symmetrically installed on the lifting mechanism (7) with a parallel quadrilateral structure. Guided by the track groove of the limiting guide plate (704), the bag shoulder gripper (4) grips the bag opening and separates to the left and right when moving downward, and moves towards the middle when moving upward. The lifting mechanism (7) also includes a photoelectric stop block (710) installed on the lifting plate (701) and multiple light fork sensors (703) installed on the limiting guide plate (704) to detect the position of the bag shoulder gripper (4).

[0059] The film supply assembly (8) includes a straight roll film material (C) that is placed horizontally on a roll film hanging rod (804) by means of a roller shaft (805) and a roller (806). The extended end of the roll film is provided with an electric roller (801) and a pressure roller (802) to assist in film output. The roll film hanging rod (804) is installed on a horizontal mounting rod (803) and can be lifted for easy film replacement.

[0060] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A packaging machine suitable for filling and sealing bags made from straight roll film material, comprising: a bag feeding mechanism, a cutting assembly, a sealing assembly, a bag shoulder gripper, a bag opening expander, a feeding hopper, a lifting mechanism, and a film supply assembly, wherein, The bag-raising mechanism is equipped with a cutter assembly, a sealing assembly is located above the cutter assembly, bag shoulder grippers are symmetrically mounted on the lifting mechanism, and a bag opening expansion nozzle is also mounted on the lifting mechanism. The feed hopper is located above the lifting mechanism, and the film supply assembly is located below the lifting mechanism. The bag-raising mechanism is characterized by: a stopper core and front and rear templates fixing the bag opening to prevent slippage; the stopper core keeps the bag opening open, allowing the bag opening to be fitted into the bag opening expansion nozzle when the bag opening rises; the bag-raising mechanism and the cutter assembly share a set of cylinders for forward and backward movement; the sealing assembly and the cutter assembly are separate, but when the cutter assembly is directly below the sealing assembly, they share a set of cylinders to close; the bag shoulder grippers are symmetrically mounted on the left and right sides of the bag opening expansion nozzle and are mounted together on the lifting mechanism; a pair of bag shoulder grippers guide the lifting mechanism's movement along its track groove while simultaneously separating to the left and right or moving closer to the center; the bag opening expansion nozzle is opened by passive contact from the insertion of the feed hopper and maintains synchronous opening and closing by the meshing of gear pairs on the edge of the nozzle.

2. The packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The bag-loading mechanism includes a plug, front and rear molds for the bag opening, and a cylinder drive structure. The plug is placed in the middle of the bag opening, and its own weight presses down on the bag opening to prevent it from slipping. At the same time, there are gaps between the plug and the front and rear molds for the bag opening, so that the bag opening will not be stuck when it is lifted up. After the front and rear molds for the bag opening are closed, there is an opening size for the plug in the middle, and there are concave notches on both sides, so that the shoulders of the fixed bag opening are exposed, making it easy for the bag shoulder gripper to insert and grab. Furthermore, the cross-section of the plug has a certain width, which keeps the middle of the bag opening in an open state. The entire bag-loading mechanism can be extended forward to the bag filling axis position (I) or retracted to the off-center position (II) at the same time as the cutting blade through the extension and retraction action of the cylinder.

3. A packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The cutting assembly includes front and rear blade seats and guide pins. Multiple compression springs are located between the blade seats and guide pins to keep the front and rear blade seats elastically opening and closing. At the same time, the upper part of the rear blade seat is equipped with a blade and a blade end pressure strip. Multiple spring plates are located between the two to allow the blade to cut the bag opening after the pressure strip presses down on the bag.

4. A packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The sealing assembly includes a heating strip installed in the heating groove and embedded in the relative positions of the front and rear fixing rods. When the cylinder assembly pushes the rear fixing rod and the front fixing rod to close and complete the heat sealing of the bag bottom, the front fixing rod and the rear fixing rod push against the front blade seat and the rear blade seat located at the bag filling axis position (I) respectively, causing the cutting assembly to close, cutting off the bottom tail of the bag, and completing the bag making action.

5. A packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The bag shoulder clamping fingers are contained in a cylinder body, which simultaneously includes a rear piston rod and a front piston rod that are respectively connected to the front and rear clamping fingers. There is an air inlet in the center of the cylinder body. After compressed air is filled in, the front and rear clamping fingers clamp together. A compression spring is installed between the front and rear clamping fingers so that the bag shoulder clamping fingers can open and return to their original position. There are clearance gaps in the middle of the clamping sections of the front and rear clamping fingers to avoid the bag positioning clips on the front and rear molds of the bag opening.

6. A packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The bag opening expansion nozzle includes front and rear expansion nozzle pieces mounted on a fixed frame. It opens and closes synchronously by the meshing of gear pairs on the edge of the nozzle jaws and returns to the closed state by the tension spring. The bag opening expansion nozzle is fixed on the lifting mechanism. When it moves upward with the lifting mechanism, the bag opening expansion nozzle opens due to the passive resistance caused by the insertion of the feed hopper. At the same time as it opens, the front and rear expansion nozzle pieces resist the bag opening pressure spring and press down on the front and rear edges of the bag opening.

7. A packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The lifting mechanism includes a lifting plate and a linear motion mechanism. The lifting plate is symmetrically positioned on the left and right sides and forms a parallelogram structure with a straight pin, a swing arm and a connecting pin to connect a pair of bag shoulder grippers and a limiting roller. The limiting roller guides the movement of the bag shoulder grippers along the track groove of the limiting guide plate. When the grippers move downward, they grip the bag opening and separate to the left and right. When the grippers move upward, the bag opening moves closer to the center. In addition, multiple optical fork sensors are installed to detect the position of the bag shoulder grippers.

8. A packaging machine for filling and sealing bags made from straight roll film material according to claim 1, characterized in that: The film supply assembly includes a straight roll of film material (C) placed on a film hanging rod by means of a roller shaft, and an electric roller and a pressing roller are provided at the extended end of the roll to assist in film output.

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