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

Abstract

The invention 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] The invention relates to a packaging machine suitable for bag making, filling and sealing of straight roll film materials, which can realize an automated process. Background Art

[0002] While there are numerous automatic packaging machines for single-sheet and multi-sheet film materials, as well as pre-made bags, there are relatively few automatic packaging machines that can directly utilize straight-tube film rolls, which can only be used as raw material for bag making or manual packaging. Patent CN216468822U also describes an auxiliary bagging machine that can only use straight-tube film rolls with pre-made openings. A more common example is the FFS heavy-film bag-making packaging machine described in Patent CN119503235A, which is complex and expensive, and is primarily used in the industrial chemical packaging field. Summary of the Invention

[0003] The present invention relates to a packaging machine suitable for bag making, filling and sealing of straight roll film materials. The machine has a simple structure, is economical and practical, and can realize automatic packaging of common agricultural product pellet feeds, small vegetables and fruits, and some industrial raw materials.

[0004] The present invention comprises the following process steps:

[0005] (1) Bagging: Manually remove the film mouth, i.e. the bag mouth, from the film supply assembly and place it between the front and rear molds of the bagging mechanism, and fix the bag mouth by relying on the deadweight of the middle plug core.

[0006] (2) Grab the bag: Move the bag shoulder clamp downward to the bag grabbing position (a) and insert it into the concave notches on both sides of the front and rear molds of the bag opening to grab the bag shoulder.

[0007] (3) Bagging: The bag shoulder clamp grasps the bag shoulder and puts it upward onto the expansion mouth of the bag. At this time, the bag is in the straight tube film (C) state.

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

[0009] (5) Bag opening: The shoulder gripper grabs the bag shoulder and continues to move upward to the material filling position (c). The bag is opened due to the passive resistance of the expansion mouth of the bag opening caused by the relative insertion of the feed hopper.

[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 pair is in the initial retracted state; the bag loading mechanism and the cutting pair retreat to make way for the full bag (F) to release the material drop channel.

[0011] (7) Sealing: The bag shoulder clamping fingers are changed to descend to the heat sealing position point (d) of the bag opening; the sealing pair is closed again to complete the bag sealing process.

[0012] (8) Bag dropping: The sealing pair moves away again, the bag shoulder clamp opens the bag shoulder, and the full bag (F) drops down.

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

[0014] The present invention comprises: a bag loading 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, wherein the bag loading mechanism is equipped with a cutter pair, the sealing pair is close to the top of the cutter pair, the bag shoulder clamping finger is symmetrically installed on the lifting mechanism, the bag opening expansion nozzle is also installed on the lifting mechanism, the feeding hopper is located at the upper part of the lifting mechanism, and the film supply assembly is located at the lower part of the lifting mechanism, which is characterized in that: the bag loading mechanism is fixed by a plug core and front and rear molds to prevent the bag opening from slipping, and the plug core keeps the bag opening in an open state so that When the bag mouth rises, the bag mouth expansion nozzle is inserted into the bag mouth. The bag loading mechanism and the cutter pair share a set of cylinders to extend and retract. The sealing pair and the cutter pair are separated, but when the cutter pair is directly below the sealing pair, they share a closing device. The bag shoulder clamps are symmetrically installed on the left and right sides of the bag mouth expansion nozzle and are installed on the lifting mechanism together. A pair of bag shoulder clamps guide the lifting and lowering along the trajectory groove of the lifting mechanism while separating to the left and right or approaching to the middle. The bag mouth expansion nozzle is opened by the passive resistance of the insertion of the feed hopper and relies on the engagement of the gear pair on the edge of the mouth jaw to keep the opening and closing synchronized.

[0015] The bag loading mechanism includes a plug core, front and rear molds of the bag opening, and a cylinder drive structure. The plug core is placed in the middle of the bag opening. The weight of the plug core presses the bag opening to prevent it from sliding. At the same time, there is a gap between the plug core and the front and rear molds of the bag opening. When the bag opening is lifted up, it will not be stuck. After the front and rear molds of the bag opening are closed, the hole size of the plug core is left in the middle. At the same time, concave notches are left on the left and right sides, so that the shoulders of the bag opening are exposed after being fixed, which is convenient for the bag shoulder clamping fingers to insert and grab. Furthermore, the cross-section of the plug core has a certain width. This width always squeezes the middle of the bag opening into an open state. The entire bag loading mechanism can be extended to the bag filling axis position (I) or retreated to the deviated position (II) at the same time as the cutter pair through the telescopic action of the cylinder.

[0016] The cutter pair includes front and rear blade seats and guide pins. There are multiple compression springs between the blade seats and the guide pins to keep the front and rear blade seats elastically open and closed. At the same time, a blade and a blade end pressure strip are installed on the upper part of the rear blade seat. There are multiple spring sheets between the two to enable the blade to cut the bag opening after the pressure strip presses the bag.

[0017] The sealing pair includes a heating strip installed in the heating groove and embedded in the relative position of the front and rear fixing rods. When the cylinder group 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 respectively push the front blade seat and the rear blade seat at the bag filling axis position (I) to cause the cutting pair to close, cut off the tail of the bag bottom, and complete the bag making action.

[0018] The bag shoulder clamping fingers include a cylinder body containing a rear piston rod and a front piston rod, which are respectively connected to the front and rear clamping fingers. There is an air inlet hole in the middle of the cylinder body. After compressed air is filled in, the front and rear clamping fingers are clamped. A compression spring is installed between the front and rear clamping fingers so that the bag shoulder clamping fingers can be opened and reset. There are finger gaps in the middle of the clamping sections of the front and rear clamping fingers to avoid the bag pressing positioning cards on the front and rear molds of the bag opening.

[0019] The bag opening expansion nozzle includes front and rear pieces of the expansion nozzle installed on a fixed frame, which are opened and closed synchronously by the engagement of a gear pair on the edge of the mouth jaw, and restored to a closed state by a tensioning spring. The bag opening expansion nozzle is fixed on a lifting mechanism, and as it moves upward, the insertion of the feed hopper causes the bag opening expansion nozzle to passively contact and open. At the same time, the front and rear pieces of the expansion nozzle respectively contact the bag opening pressure spring piece to press 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 through straight pins, swing arms and connecting pins to form a parallelogram structure to connect a pair of bag shoulder clamping fingers and a limiting roller. The limiting roller guides the movement of the bag shoulder clamping fingers along the track groove of the limiting guide plate. When the bag shoulder clamping fingers move downward, they clamp the bag opening and separate them to the left and right sides. When the bag shoulder clamping fingers move upward, the bag opening moves closer to the middle. In addition, multiple optical fork sensors are installed to detect the position points of the bag shoulder clamping fingers.

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

[0022] The beneficial effects of the present invention are: the bag is kept open by the plug core and the front and rear molds, eliminating the commonly used complex vacuum adsorption bag opening mechanism; the detachable structure of the sealing pair and the cutting pair allows a set of sealing pairs to seal the bag mouth and the bag bottom; the left and right pairs of bag shoulder clamping fingers control their lifting and lowering along the trajectory groove of the lifting mechanism while separating to the left and right or approaching to the middle, so as to cooperate 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 opened by passive resistance due to the insertion of the feed hopper and relies on the meshing form of the gear pair to maintain expansion synchronization, also eliminating the complex front and rear opening and closing structure of the expansion nozzle; in summary, the optimized parts structure and process control are used to realize the use of straight roll film materials to complete automatic packaging of materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a structural diagram of the bag loading mechanism and the cutter pair.

[0025] Figure 3 It is a structural diagram of the sealing pair.

[0026] Figure 4 It is a structural diagram of the bag shoulder clamping fingers.

[0027] Figure 5 It is a structural diagram of the bag expansion nozzle.

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

[0029] Figure 7 It is a structural diagram of the membrane supply component.

[0030] Figure 8 It is a schematic diagram of the bagging process.

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

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

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

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

[0035] Reference numerals: bag loading mechanism (1), plug core (101), bag opening rear mold (102), bag opening front mold (103), cylinder fixing plate (104), guide rod (105), cutter pair (2), front blade seat (201), rear blade seat (202), blade (203), blade end pressure strip (204), guide pin (205), compression spring (206), spring sheet (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 clamping finger (4), cylinder body (401), mounting seat (402), rear piston rod (403), connecting plate (404), front piston rod (405), connecting rod (406), rear clamping finger (407), compression spring (408), front clamping finger (409), spring pressure plate (410), retaining spring (411), sealing ring (412), bag opening expansion nozzle (5), expansion nozzle front plate (501), expansion nozzle rear plate (502), tensioning 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), optical fork sensor (703), limiting guide plate (704), direct pin (705), swing arm (706), connecting pin (707), limiting roller (708), limiting pin (709), photoelectric block (710), film supply assembly (8), electric roller (801), pressure roller (802), horizontal mounting rod (803), film roll hanging rod (804), roller shaft (805), supporting wheel (806). DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, this application is further described in detail below with reference to the accompanying drawings.

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

[0038] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "middle", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] In addition, the meaning of "linear motion mechanism" includes not only the screw nut drive mentioned in the article, but also the common synchronous belt, belt, chain, gear rack or cylinder drive.

[0040] The specific embodiment of the present invention is shown in Figures 1 to 12 A packaging machine suitable for bag making, filling and sealing of straight roll film materials includes the following process steps:

[0041] (1) During the first operation, the film mouth is taken out from the film supply assembly (8), i.e., the bag mouth is placed between the bag mouth rear support mold (102) and the bag mouth front support mold (103) of the bag upper mechanism (1), and the plug core (101) is placed in the middle of the bag mouth. After the front and rear molds of the bag mouth are closed, the bag mouth is fixed in place by the dead weight of the middle plug core (101). At this time, the bag mouth is flush with the upper surface of the closed mold. By relying on the certain thickness of the plug core (101) and the shape of the front and rear support molds (102) of the bag mouth, the bag mouth always maintains a state in which its cross section is open in the middle and the two shoulders are closed; after completing the film mouth bagging process, the film supply assembly (8) supplies the film according to the packaging procedure.

[0042] (2) The bag-loading mechanism (1) is extended forward to the bag filling axis position (I) through the cylinder, and the bag shoulder clamping finger (4) is moved downward to the bag opening above the bag-loading mechanism (1), that is, the bag grabbing position point (a), through the lifting mechanism (7), and inserted into the concave notch of the front and rear molds of the bag opening to grab the bag shoulder.

[0043] (3) When the bag shoulder gripping fingers (4) grab the bag shoulder and move upward, the bag mouth is in an open state and can be put on the bag mouth expansion nozzle (5). At this time, the bag is in a straight tube film (C) state.

[0044] (4) The shoulder gripper (4) grabs the shoulder of the bag and continues to move upward for a distance equal to the prefabricated length of the bag, and then reaches the bag-making position (b). The sealing pair (3) closes for the first time to complete the heat sealing of the bag bottom. At the same time, the blade (203) and the front blade seat (201) of the cutting knife pair (2) are also closed under the cylinder drive of the sealing pair (3), cutting off the tail of the bag bottom, completing the bag-making action. At this time, the bag is in the empty bag (N) state. It must be noted that the height of the bag-making position (b) can be changed to change the bag-making length.

[0045] (5) The shoulder gripping fingers (4) grab the shoulder and continue to move upward to the material filling position (c). Due to the guidance of the track groove of the limiting guide plate (704), the shoulder gripping fingers (4) move closer to the middle, completing the inward movement of the shoulder, and the middle part of the bag opening expands. At this time, the bag opening expansion mouth (5) that moves together with the shoulder gripping fingers (4) also hits the feed hopper (6). Due to the relative insertion of the feed hopper (6), the bag opening expansion mouth (5) is passively resisted and opened. At the same time, the front piece (501) and the rear piece (502) of the expansion mouth respectively resist the bag opening pressure spring piece (504) and press the front and rear edges of the bag opening.

[0046] (6) The material enters the bag from the feed hopper (6) and the bag is quantitatively filled. At this time, the bag is in the full bag state (F), and the sealing pair (3) is in the initial retracted state; the bag loading mechanism (1) and the cutter pair (2) retreat to the deviated position (II) through the cylinder, making way for the full bag (F) to drop the material.

[0047] (7) The bag shoulder clamping finger (4) is changed to descend to the bag opening heat sealing position point (d); the sealing pair (3) is closed again to complete the bag opening sealing process.

[0048] (8) The sealing pair (3) moves away again, the shoulder gripping fingers (4) open the shoulder of the bag, and the full bag (F) falls down.

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

[0050] A packaging machine suitable for bagging, filling and sealing straight roll film materials, comprising: a bagging mechanism (1), a cutter pair (2), a sealing pair (3), a bag shoulder clamping finger (4), a bag opening expansion nozzle (5), a feeding hopper (6), a lifting mechanism (7) and a film supply assembly (8), wherein the bagging mechanism (1) is installed with the cutter pair (2), the sealing pair (3) is close to the top of the cutter pair (2), the bag shoulder clamping finger (4) is symmetrically installed on the lifting mechanism (7), the bag opening expansion nozzle (5) is also installed on the lifting mechanism (7), the feeding hopper (6) is located at the upper part of the lifting mechanism (7), and the film supply assembly (8) is located at the lower part of the lifting mechanism (7), and is characterized in that: the bagging mechanism (1) is fixed with a plug core and front and rear molds to prevent the bag opening from slipping, and the bag opening is fixed with a plug core and front and rear molds to prevent the bag opening from slipping. The plug core keeps the bag opening in an open state so that the bag opening can be inserted into the bag opening expansion nozzle (5) when the bag opening rises. The bag-loading mechanism (1) and the cutter pair (2) share a set of cylinders for extending and retreating. The sealing pair (3) and the cutter pair (2) are separated, but the cutter pair (2) shares a set of closing devices when it is directly below the sealing pair (3). The bag shoulder clamping fingers (4) are symmetrically separated on the left and right sides of the bag opening expansion nozzle (5) and are installed on the lifting mechanism (7) together. The pair of bag shoulder clamping fingers (4) are guided to rise and fall along the track groove of the lifting mechanism (7) while separating to the left and right or approaching to the middle. The bag opening expansion nozzle (5) is opened by the passive resistance of the insertion of the feed hopper (6) and is kept open and closed synchronously by the engagement of the gear pair at the edge of the mouth jaw.

[0051] The bag-loading mechanism (1) comprises a plug core (101), a rear support mold (102) for the bag opening and a front support mold (103) for the bag opening. The cross section of the plug core (101) is an X-shaped shape with concave sides (inverted triangle and wedge are described as the same), the rear support mold (102) for the bag opening and the front support mold (103) for the bag opening are convex in cross section, the bag opening is placed between the rear support mold (102) for the bag opening and the front support mold (103) for the bag opening, the plug core (101) is placed in the middle of the bag opening, and the bag opening is pressed down by the dead weight of the plug core (101) so that it does not slide. There is a gap between the plug core (101) and the rear support mold (102) and the front support mold (103) of the bag mouth, so that the bag mouth will not be stuck when it is lifted up. After the rear support mold (102) and the front support mold (103) of the bag mouth are molded together, the size of the opening of the plug core (101) is left in the middle, and the left and right sides are left with concave notches, so that the two shoulders of the bag mouth after being fixed are exposed to facilitate the insertion and grasping of the bag shoulder clamping fingers (4). Furthermore, the cross-section of the plug core (101) has a certain width, and this width always squeezes the middle of the bag mouth into an open state.

[0052] The bag loading mechanism (1) further comprises a cylinder fixing plate (104) and a guide rod (105), and the bag opening rear support mold (102) and the bag opening front support mold (103) are both mounted on the guide rod (105). Through the telescopic action 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 deviated position (II).

[0053] The cutter pair (2) includes a front blade seat (201) mounted on the upper part of the front mold (103) of the bag opening, the front blade seat (201) is passed through the guide pin (205), the guide pin (205) is inserted into the side of the front mold (103) of the bag opening, and a compression spring (206) is installed in the guide pin (205) and the front blade seat (201) to keep the front blade seat (201) elastically open and closed. The cutter pair (2) also includes a rear blade seat ( 202), the rear blade seat (202) is worn on the guide pin (205), the guide pin (205) is inserted into the side of the rear mold (102) of the bag opening, and a compression spring (206) is installed in the guide pin (205) and the rear blade seat (202) to keep the rear blade seat (202) elastically open and close, and a blade (203) is installed on the upper part of the rear blade seat (202), and a spring sheet (207) is installed on the lower side of the blade (203) of the blade, and the spring sheet (207) is connected to the blade end pressure strip (204).

[0054] The sealing pair (3) includes a heating strip (301) fixed on a heating groove (302), the heating groove (302) is respectively embedded in the opposite positions of the rear fixing rod (303) and the front fixing rod (304), two parallel guide rods (305) are inserted on both sides of the rear fixing rod (303) and the front fixing rod (304), the guide rods (305) are fixed on the guide rod fixing block (306), the rear fixing rod (303) is driven forward by a cylinder, and the front fixing rod (304) is driven backward by the cylinders on both sides. When the cylinder group in the sealing pair (3) pushes the rear fixed rod (303) and the front fixed rod (304) to close and seal the bottom of the bag, the front fixed rod (304) and the rear fixed rod (303) push and block the front blade seat (201) and the rear blade seat (202) at the bag filling axis position (I) respectively, causing the cutting pair (2) to close and cut the tail of the bag bottom, thus completing the bag making action.

[0055] The shoulder clamping finger (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 clamping finger (407), the rear piston rod (403) is connected to the front clamping finger (409) through a connecting rod (406) and a connecting piece (404), the front piston rod (405) is limited by a retaining spring (411), the rear piston rod (403) is limited by a mounting seat (402), and both the front piston rod (405) and the rear piston rod (403) are Equipped with a sealing ring (412), the front clamping finger (409) and the rear clamping finger (407) have finger gaps to avoid the bag opening rear mold (102) and the bag opening front mold (103) on the pressure bag positioning card, the front clamping finger (409) and the rear clamping finger (407) are equipped with a compression spring (408) and a spring pressing piece (410) to open and reset the bag shoulder clamping finger (4), the cylinder body (401) has an air inlet hole in the middle, and the front clamping finger (409) and the rear clamping finger (407) are clamped after compressed air is filled.

[0056] The bag opening expansion nozzle (5) includes a fixed frame (505) fixed on the lifting mechanism (7) through a connecting slide column (506) and a connecting rod (507), and the expansion nozzle front piece (501) and the expansion nozzle rear piece (502) are installed on the fixed frame (505). The expansion nozzle front piece (501) and the expansion nozzle rear piece (502) are synchronized by the engagement of the gear pair at the edge of the mouth jaw to achieve synchronous opening and closing, and the tensioning action of the tensioning spring (503) is used to restore the closed state. When the bag opening expansion nozzle (5) moves upward following the lifting mechanism (7), the insertion of the feed hopper (6) causes the bag opening expansion nozzle (5) to open due to passive resistance. At the same time, the expansion nozzle front piece (501) and the expansion nozzle rear piece (502) respectively contact the bag opening pressure spring piece (504) to press the front and rear edges of the bag opening.

[0057] Exhaust interlayers are provided on both sides of the feed hopper (6).

[0058] The lifting mechanism (7) includes a lifting plate (701) and a linear motion mechanism (702) on a linear guide rail slider pair driven by a motor-driven screw nut transmission structure. The bag shoulder clamp finger (4) is fixed to two swing arms (706) through two straight pins (705). The two swing arms (706) are fixed to the lifting plate (701) through two connecting pins (707). The two straight pins (705) plus the two swing arms (706) plus the two connecting pins (707) form a parallelogram structure, so that the bag shoulder clamp finger (4) can move horizontally. At the same time, a limit pin (709) and a limit roller ( 708), the limiting roller (708) guides the bag shoulder clamping finger (4) to move along the limiting guide plate (704) processed with a track groove. The above-mentioned bag shoulder clamping finger (4) and the flat quadrilateral structure are symmetrically installed on the lifting mechanism (7). Guided by the track groove of the limiting guide plate (704), the bag shoulder clamping finger (4) clamps the bag opening to the left and right sides when it moves downward, and the bag opening moves closer to the middle when it moves upward; the lifting mechanism (7) also includes a photoelectric block (710) installed on the lifting plate (701) and a plurality of optical fork sensors (703) installed on the limiting guide plate (704) to detect the position point of the bag shoulder clamping finger (4).

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

[0060] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A packaging machine suitable for bagging, filling and sealing of straight roll film materials, comprising the following process steps: (1) bagging: manually taking out the film opening from the film supply assembly, that is, placing the bag opening between the front and rear molds of the bagging mechanism, and fixing the bag opening by relying on the deadweight of the middle plug core; (2) bag grabbing: the bag shoulder clamping finger moves downward to the bag grabbing position point (a) and inserts into the concave notches on both sides of the front and rear molds of the bag opening to grab the bag shoulder; (3) bagging: the bag shoulder clamping finger grabs the bag shoulder and puts it upward on the expansion mouth of the bag opening, at which time the bag is in the straight film state (C); (4) bag making: the bag shoulder clamping finger grabs the bag shoulder and continues to move upward for a distance to the bag making position point (b), the sealing pair is initially closed to complete the heat sealing of the bag bottom, and at the same time the cutting knife pair is closed to cut the tail of the bag bottom to complete the bag making action, at which time the bag is in the empty bag state (N); (5) bag opening: The shoulder clamp grabs the shoulder of the bag and moves upward to the material filling position (c). The relative insertion of the feed hopper causes the expansion mouth of the bag to open due to passive resistance; (6) Filling: The material enters the bag from the feed hopper and the quantitative filling is completed. At this time, the bag is in the full bag (F) state, and the sealing pair is in the initial retreat state; the bag loading mechanism and the cutting pair retreat to the full bag (F) to make way for the material drop channel; (7) Bag sealing: The shoulder clamp changes to descend to the heat sealing position (d) of the bag mouth; the sealing pair closes again to complete the bag sealing process; (8) Bag dropping: The sealing pair retreats again, the shoulder clamp opens the bag shoulder, and the full bag (F) falls; (9) Repeat the actions (2) to (8) to achieve automated packaging.

2. A packaging machine suitable for bagging, filling and sealing of straight roll film materials, comprising: a bag loading mechanism, a cutting pair, a sealing pair, bag shoulder clamping fingers, a bag opening expansion nozzle, a feeding hopper, a lifting mechanism and a film supply component, wherein: The bag upper mechanism is equipped with a cutting knife pair, and the sealing knife pair is close to the top of the cutting knife pair. The bag shoulder clamping fingers are symmetrically installed on the lifting mechanism. The bag opening expansion nozzle is also installed on the lifting mechanism. The feed hopper is located at the upper part of the lifting mechanism, and the film supply assembly is located at the lower part of the lifting mechanism. It is characterized in that: the bag upper mechanism is fixed with a plug core and front and rear molds to prevent the bag opening from slipping. The plug core keeps the bag opening open and enables the bag opening to be inserted into the bag opening expansion nozzle when it rises. The bag upper mechanism and the cutting knife pair share a set of cylinders to extend and retreat. The sealing knife pair and the cutting knife pair are separated, but they share a set of cylinders to close when the cutting knife pair is directly below the sealing knife pair. The bag shoulder clamping fingers are symmetrically installed on the left and right sides of the bag opening expansion nozzle and are jointly installed on the lifting mechanism. A pair of bag shoulder clamping fingers guide the lifting and lowering along the trajectory groove of the lifting mechanism while separating to the left and right or approaching to the middle. The bag opening expansion nozzle is opened by passive resistance of the insertion of the feed hopper and relies on the meshing of the gear pair on the edge of the mouth jaw to maintain synchronous opening and closing.

3. A packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, characterized in that: The bag loading mechanism includes a plug core, front and rear molds of the bag opening, and a cylinder drive structure. The plug core is placed in the middle of the bag opening. The weight of the plug core presses the bag opening to prevent it from sliding. At the same time, there is a gap between the plug core and the front and rear molds of the bag opening. When the bag opening is lifted up, it will not be stuck. After the front and rear molds of the bag opening are closed, the hole size of the plug core is left in the middle. At the same time, concave notches are left on the left and right sides, so that the shoulders of the bag opening are exposed after being fixed, which is convenient for the bag shoulder clamping fingers to insert and grab. Furthermore, the cross-section of the plug core has a certain width. This width always squeezes the middle of the bag opening into an open state. The entire bag loading mechanism can be extended to the bag filling axis position (I) or retreated to the deviated position (II) at the same time as the cutter pair through the telescopic action of the cylinder.

4. The packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, characterized in that: The cutter pair includes front and rear blade seats and guide pins. There are multiple compression springs between the blade seats and the guide pins to keep the front and rear blade seats elastically open and closed. At the same time, a blade and a blade end pressure strip are installed on the upper part of the rear blade seat. There are multiple spring sheets between the two to enable the blade to cut the bag opening after the pressure strip presses the bag.

5. The packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, characterized in that: The sealing pair includes a heating strip installed in the heating groove and embedded in the relative position of the front and rear fixing rods. When the cylinder group 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 respectively push the front blade seat and the rear blade seat at the bag filling axis position (I) to cause the cutting pair to close, cut off the tail of the bag bottom, and complete the bag making action.

6. The packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, characterized in that: The bag shoulder clamping fingers include a cylinder body containing a rear piston rod and a front piston rod, which are respectively connected to the front and rear clamping fingers. There is an air inlet hole in the middle of the cylinder body. After compressed air is filled in, the front and rear clamping fingers are clamped. A compression spring is installed between the front and rear clamping fingers so that the bag shoulder clamping fingers can be opened and reset. There are finger gaps in the middle of the clamping sections of the front and rear clamping fingers to avoid the bag pressing positioning cards on the front and rear molds of the bag opening.

7. The packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, characterized in that: The bag opening expansion nozzle includes front and rear pieces of the expansion nozzle installed on a fixed frame, which are opened and closed synchronously by the engagement of a gear pair on the edge of the mouth jaw, and restored to a closed state by a tensioning spring. The bag opening expansion nozzle is fixed on a lifting mechanism, and as it moves upward, the insertion of the feed hopper causes the bag opening expansion nozzle to passively contact and open. At the same time, the front and rear pieces of the expansion nozzle respectively contact the bag opening pressure spring piece to press the front and rear edges of the bag opening.

8. The packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, 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 through straight pins, swing arms and connecting pins to form a parallelogram structure to connect a pair of bag shoulder clamping fingers and a limiting roller. The limiting roller guides the movement of the bag shoulder clamping fingers along the track groove of the limiting guide plate. When the bag shoulder clamping fingers move downward, they clamp the bag opening and separate them to the left and right sides. When the bag shoulder clamping fingers move upward, the bag opening moves closer to the middle. In addition, multiple optical fork sensors are installed to detect the position points of the bag shoulder clamping fingers.

9. The packaging machine suitable for bag making, filling and sealing of straight roll film materials according to claim 2, characterized in that: The film supply assembly includes a straight roll film material (C) placed on the film hanging rod by a roller shaft, and an electric roller and a pressing roller are provided at the protruding end of the film to assist the film discharge.

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