A bag mouth fixing and tightening linkage device in a solid fluid full-automatic packaging machine

Abstract

The application discloses a bag opening fixing and tightening linkage device in a solid fluid full-automatic packaging machine, which comprises a lifting frame arranged on a main frame of the automatic packaging machine, a lifting filling cylinder fixed on the lifting frame, and a pair of bag opening fixing and tightening assemblies fixed on the lifting frame and arranged at two side parts of a lower part of the lifting filling cylinder. Each bag opening fixing and tightening assembly comprises a bag opening tightening cylinder and a bag opening fixing cylinder arranged in an up-down direction. A piston rod front end of the bag opening fixing cylinder is provided with a top pressure head for fixing a ton bag opening sleeved on an outer circle of the lower part of the lifting filling cylinder. A piston rod front end of the bag opening tightening cylinder is provided with a half clamp for tightening the ton bag opening fixed on the outer circle of the lower part of the lifting filling cylinder. The application realizes automatic fixing of the ton bag opening after automatic sleeving and facilitates automatic accurate material supplement after rechecking and weighing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging machines, in particular to a bag opening fixing and tightening linkage device in a solid fluid full-automatic packaging machine. BACKGROUND

[0002] The quantitative packaging scale (also known as ton bag packaging machine) is a kind of packaging equipment for solid flow state (granular material or powder material) quantitative packaging. Most of the quantitative packaging scales on the market currently adopt a semi-automatic packaging working mode. During operation, the bag needs to be manually taken, opened and hung, and after the bag is hung on the packaging machine, the packaging machine automatically adds the material in a quantitative manner. After the material is added, the ton bag filled with the material is transferred to the conveyor and then sent to the next work station for bag opening sealing operation.

[0003] However, the above semi-automatic packaging machine has the following problems during use: during the packaging process, the ton bag is open for a long time after being filled with material, which may cause the material to be polluted by air, thereby possibly reducing the performance of the material itself. On the other hand, the dust generated during the material packaging process may also pollute the surrounding environment, which is poor in environmental protection. Secondly, for some special industries such as lithium battery material industry, due to the high price of lithium battery material, higher requirements are put forward for the accuracy of quantitative packaging, and the existing packaging machine cannot meet the requirements of high-precision packaging. In addition, the use of semi-automatic packaging machine increases the labor cost and reduces the packaging efficiency.

[0004] Therefore, it is necessary to develop a solid fluid full-automatic packaging machine to realize the full-automatic operation of taking, opening, sleeving, clamping, weighing, loading, sealing and dust removal processes. SUMMARY

[0005] The purpose of the present application is to overcome the drawbacks of the existing packaging machine that needs manual bag hanging (sleeving) operation, and to provide a bag opening fixing and tightening linkage device in a solid fluid full-automatic packaging machine, which aims to automatically fix the ton bag opening after automatic sleeving. The specific technical solution is as follows:

[0006] The bag mouth fixing and tightening linkage device in a solid fluid full-automatic packaging machine comprises a lifting frame arranged on the main frame of the automatic packaging machine, a lifting filling cylinder fixed on the lifting frame, and a pair of bag mouth fixing and tightening assemblies fixed on the lifting frame and arranged at both sides of the lower part of the lifting filling cylinder.

[0007] The bag mouth fixing and tightening linkage device in a solid fluid full-automatic packaging machine further comprises a bag opening and sleeving device arranged on the main frame and used for opening the bag mouth of a ton bag and sleeving the bag mouth onto the lifting filling cylinder.

[0008] Preferably, the bag opening and sleeving assembly comprises a U-shaped rotating arm arranged at the lower end of the bag opening and sleeving moving frame and having an opening downward, a pair of guide rods fixed between the U-shaped openings of the U-shaped rotating arm and arranged in parallel and at intervals, and a pair of bag opening and sleeving mechanical arms movably arranged on the pair of guide rods.

[0009] In the present application, the end of the bag opening and sleeving mechanical arm is provided with a bag opening and sleeving mechanical palm, and one side of the bag opening and sleeving mechanical palm in contact with the inner wall of the bag mouth of the ton bag is provided with a strip-shaped convex rib.

[0010] The strip-shaped convex rib arranged on the bag opening and sleeving mechanical palm can ensure the opening of the bag mouth and minimize the contact area between the bag opening and sleeving mechanical palm and the ton bag, thereby protecting the bag mouth from being scratched.

[0011] Preferably, the front end of the piston rod of the bag mouth fixing cylinder is provided with a section of stud, the top pressing head is fixed on the section of stud through thread connection and locked by a locking nut.

[0012] In the application, the top pressure head comprises a rigid connecting ring threaded with a section of stud at the front end of the piston rod and a top pressure cylinder fixed at the front end of the rigid connecting ring.

[0013] In the application, the half clamp comprises a half support frame and a half tightening sleeve fixed on the half support frame, and the half flanges are arranged at the two ends of the half tightening sleeve.

[0014] Preferably, the top pressure cylinder is an elastic rubber top pressure cylinder, and the half tightening sleeve is an elastic rubber half tightening sleeve.

[0015] Preferably, the bag mouth fixing cylinder is a single-shaft cylinder, and the bag mouth tightening cylinder is a three-shaft cylinder.

[0016] In the application, the automatic packaging machine mainframe is further provided with a bag mouth shaping and holding mechanism for replenishment, which comprises four bag expanding rod bodies arranged on the periphery of the lifting type filling cylinder and close to the lifting type filling cylinder, and the four bag expanding rod bodies are arranged on the front and rear sides of the lifting type filling cylinder in a pair-by-pair close arrangement mode.

[0017] In the application, the four bag expanding rod bodies realize the horizontal movement of opening the bag mouth of the ton bag through a bag expanding rod body operating assembly.

[0018] Preferably, the number of bag expanding rod body operating assemblies on the lifting frame is two groups, and the two groups of bag expanding rod body operating assemblies are respectively a first group of bag expanding rod body operating assemblies and a second group of bag expanding rod body operating assemblies, and the first group of bag expanding rod body operating assemblies and the second group of bag expanding rod body operating assemblies are arranged in layers according to the up-down positions on the lifting frame.

[0019] In the application, a retreat stopper is arranged between the bag expanding rod body operating assembly and the bag mouth fixing and tightening assembly for smoothly withdrawing the bag supporting mechanical arm after the bag supporting and sleeving device completes the bag sleeving.

[0020] The use method of the application is as follows:

[0021] (1) Bag fitting: After the bag opening of the ton bag is opened at the bag opening station (bag opening frame) of the automatic packaging machine, the bag supporting and bag fitting moving frame moves backward under the action of the moving frame push-pull cylinder, so that the bag supporting mechanical hands on the pair of bag supporting mechanical arms at the lower end of the bag supporting and bag fitting moving frame are inserted into the bag opening of the ton bag. Then, under the action of the screw rotation drive motor, the bag opening of the ton bag located on the bag opening frame is supported and tightened. Then the bag supporting and bag fitting moving frame moves forward. After it is in place, the pair of bag supporting mechanical arms swing upward at a certain angle in the front-back direction, so that the bag opening of the ton bag is covered on the lifting filling cylinder of the main machine of the packaging machine. At this time, the four bag expanding rods close to the lifting filling cylinder are also fitted into the bag opening of the ton bag, thus completing the bag fitting action of the ton bag opening.

[0022] (2) Automatic fixing after bagging: After the bag mouth is put onto the lifting filling cylinder, the bag mouth fixing cylinder is activated. The top pressure head at the front end of the piston rod of the bag mouth fixing cylinder presses against the bag mouth to fix it.

[0023] (3) Retraction of the bag-supporting robotic arm: After the bag opening of the ton bag is fixed, under the action of the swing control motor, the bag-supporting robotic arm swings upward at an angle to separate from the bag opening of the ton bag. Then, under the action of the push-pull cylinder of the moving frame, it moves backward and away from the lifting filling cylinder. Under the action of the swing control motor, the bag-supporting robotic arm returns to the initial vertical position.

[0024] (4) Automatic sealing of bag opening after bagging: After the bag-supporting robotic arm retracts, the bag opening fixing and sealing component moves, causing the half clamp at the front end of the piston rod of the bag opening sealing cylinder to hold and clamp the bag opening of the ton bag. When the bag opening is clamped, the four bag-expanding rods enter the U-shaped groove through the bag wall of the bag opening, thereby realizing the automatic sealing and closure of the ton bag opening.

[0025] (5) Feeding: After the bag opening is tied, the ton bag is weighed and fed through the feeding device on the main packaging machine.

[0026] (6) Weighing and verification: After the material is added, the lifting frame is lowered and the ton bag is placed on the weighing and verification conveyor table below the main frame of the packaging machine. The bag mouth fixing cylinder is released and the bag mouth tightening cylinder is released, so that the top pressure head and half clamp are separated from the bag mouth of the ton bag. At this time, the bag expansion rod control component is activated, and the bag mouth of the ton bag is expanded and opened by the four bag expansion rods. After the bag mouth is opened, the four bag expansion rods are offset by a certain distance, so that the lifting filling cylinder and the four bag expansion rods are separated from the bag mouth. Finally, the weighing and verification conveyor table performs accurate weighing and verification of the ton bag.

[0027] (7) Material replenishment: If there is a shortage of material (insufficient bag weight) when weighing and verifying, the ton bag is replenished by the feeding device on the main packaging machine, thereby improving the accuracy of feeding.

[0028] The beneficial effects of this invention are:

[0029] First, the bag opening fixing and tightening linkage device in the solid fluid full-automatic packaging machine of the present application, by setting the lifting rack on the main machine rack of the automatic packaging machine, the lifting type filling cylinder and the bag opening fixing and tightening assembly are realized, which realizes the automatic fixing of the ton bag after automatic sleeving, thereby overcoming the drawbacks of manual bag hanging (sleeving) operation of the prior art packaging machine.

[0030] Second, the bag opening fixing and tightening linkage device in the solid fluid full-automatic packaging machine of the present application, the setting of the bag expanding rod body operating assembly on the lifting rack greatly facilitates the automatic accurate material supplement after rechecking and weighing.

[0031] Third, the bag opening fixing and tightening linkage device in the solid fluid full-automatic packaging machine of the present application, the bag opening fixing cylinder and the bag opening tightening cylinder in the bag opening fixing and tightening assembly are mutually coordinated, which can avoid the interference of the bag supporting and sleeving device with the half clamp when it is in the sleeving position. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the structure schematic diagram of the bag opening fixing and tightening linkage device in the solid fluid full-automatic packaging machine of the present application (two working positions of the bag supporting mechanical arm are drawn in the figure, and the arrow direction indicates that the bag supporting mechanical arm can be swung upward from the lower vertical position to the upper horizontal position; wherein the vertical position of the bag supporting mechanical arm is used for supporting the bag, and the horizontal position of the bag supporting mechanical arm is used for sleeving the bag);

[0033] Figure 2 is the left view of Figure 1 (not containing the bag supporting and sleeving device);

[0034] Figure 3 is the three-dimensional structure schematic diagram of Figure 2 ;

[0035] Figure 4 is the structure schematic diagram after further setting the bag opening shaping and holding mechanism for material supplement on the basis of Figure 2 ;

[0036] Figure 5 is the three-dimensional structure schematic diagram (partial view) after removing the lifting type filling cylinder in Figure 4 ;

[0037] Figure 6 is the structure schematic diagram of the half clamp;

[0038] Figure 7 is the structure schematic diagram after partially disassembling the top pressing head at the front end of the piston rod of the bag opening fixing cylinder;

[0039] Figure 8 is Figure 1The structure schematic diagram of the supporting and bagging device in the ton bag transfer frame is shown in the figure.

[0040] In the figure: 4001, ton bag, 4002, bag opening fixed tightening assembly, 4003, bag opening tightening cylinder, 4004, bag opening fixed cylinder, 4005, top pressing head, 4006, half clamp, 4007, locking nut, 4008, rigid connecting ring, 4009, top pressing cylinder, 4010, half support frame, 4011, half tightening sleeve, 4012, half flange, 4013, U-shaped groove, 4014, retreat neutral gear.

[0041] In the figure: 1001, main frame (partially);

[0042] In the figure: 3001, lifting frame, 3002, lifting filling cylinder, 3003, bag expanding rod body, 3004, bag expanding rod body operating assembly, 3006, first group of bag expanding rod body operating assembly, 3007, second group of bag expanding rod body operating assembly;

[0043] In the figure: 1, ton bag transfer frame, 31, supporting and bagging moving frame, 39, supporting mechanical arm, 41, supporting and bagging assembly, 42, U-shaped rotating arm, 43, guide rod, 44, forward and reverse screw rod, 45, forward rotation thread segment, 46, reverse rotation thread segment, 47, screw rod rotation driving motor, 52, combined helical gear reducer, 55, rotating arm swing control motor, 58, linear guide rail, 60, moving frame push-pull cylinder, 61, supporting mechanical palm, 62, strip-shaped convex rib, 63, supporting and bagging device. DETAILED DESCRIPTION

[0044] The specific embodiments of the present application are further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present application, and cannot be used to limit the protection scope of the present application.

[0045] As Figures 1 to 8The embodiment of the bag mouth fixing and tightening linkage device in the solid fluid full-automatic packaging machine is shown, which comprises a lifting frame 3001 arranged on the main machine frame 1001 of the automatic packaging machine, a lifting filling cylinder 3002 fixed on the lifting frame 3001, and a pair of bag mouth fixing and tightening assemblies 4002 fixed on the lifting frame 3001 and arranged at both sides of the lower part of the lifting filling cylinder 3002. Each bag mouth fixing and tightening assembly 4002 comprises a bag mouth tightening cylinder 4003 and a bag mouth fixing cylinder 4004 arranged in the up-down direction. The front end of the piston rod of the bag mouth fixing cylinder 4004 is provided with a pressing head 4005 for fixing the bag mouth of the ton bag 4001 sleeved on the outer circle of the lower part of the lifting filling cylinder 3002. The front end of the piston rod of the bag mouth tightening cylinder 4003 is provided with a half clamp 4006 for tightening the bag mouth of the ton bag 4001 fixed on the outer circle of the lower part of the lifting filling cylinder 3002.

[0046] The bag mouth fixing and tightening linkage device in the solid fluid full-automatic packaging machine of the embodiment further comprises a bag opening and sleeving device 63 arranged on the main machine frame 1001 and used for opening and sleeving the bag mouth of the ton bag 4001 on the lifting filling cylinder 3002.

[0047] Preferably, the bag opening and sleeving assembly 41 comprises a U-shaped rotating arm 42 arranged at the lower end of the bag opening and sleeving moving frame 31 and having an opening downward, a pair of guide rods 43 fixed between the U-shaped openings of the U-shaped rotating arm 42 and arranged in parallel and at intervals, and a pair of bag opening mechanical arms 39 movably arranged on the pair of guide rods 43. A positive and negative screw rod 44 is connected between the pair of bag opening mechanical arms 39. The positive and negative screw rod 44 is respectively provided with a positive screw thread segment 45 and a negative screw thread segment 46 having opposite screw directions. One of the pair of bag opening mechanical arms 39 is threadedly connected with the positive screw thread segment 45 of the positive and negative screw rod 44, and the other of the pair of bag opening mechanical arms 39 is threadedly connected with the negative screw thread segment 46 of the positive and negative screw rod 44. The U-shaped rotating arm 42 is provided with a screw rod rotating drive motor 47 for driving the positive and negative screw rod 44 to rotate. The bag opening and sleeving moving frame 31 is provided with a rotating arm swinging control motor 55 for driving the pair of bag opening mechanical arms 39 to swing up and down in the sleeving direction.

[0048] In the embodiment, the end of the bag opening mechanical arm 39 is provided with a bag opening mechanical palm 61, and one side of the bag opening mechanical palm 61 in contact with the inner wall of the ton bag bag mouth is provided with a strip-shaped convex rib 62.

[0049] The strip-shaped convex rib 62 on the bag opening supporting mechanical hand palm 61 can ensure the opening of the bag opening and minimize the contact area between the bag opening supporting mechanical hand palm 61 and the ton bag, thereby protecting the bag opening from being scratched.

[0050] Preferably, the front end of the piston rod of the bag opening fixing cylinder 4004 is provided with a threaded rod, and the pressing head 4005 is fixed on the threaded rod by screw connection and locked by a locking nut 4007.

[0051] In this embodiment, the pressing head 4005 includes a rigid connecting ring 4008 threadedly connected with the threaded rod at the front end of the piston rod, and a pressing cylinder 4009 fixed at the front end of the rigid connecting ring 4008.

[0052] In this embodiment, the half clamp 4006 includes a half support frame 4010 and a half tightening sleeve 4011 fixed on the half support frame 4010, and the half flanges 4012 are provided at the two ends of the half clamp 4006.

[0053] Preferably, the pressing cylinder 4009 is an elastic rubber pressing cylinder, and the half tightening sleeve 4011 is an elastic rubber half tightening sleeve.

[0054] Preferably, the bag opening fixing cylinder 4004 is a single-axle cylinder, and the bag opening tightening cylinder 4003 is a three-axle cylinder.

[0055] In this embodiment, the automatic packaging machine mainframe 1001 is further provided with a bag opening shaping and holding mechanism for replenishment, which includes four bag expanding rod bodies 3003 arranged on the periphery of the lifting type filling cylinder 3002 and close to the lifting type filling cylinder 3002, and the four bag expanding rod bodies 3003 are arranged on the front and rear sides of the lifting type filling cylinder 3002 in a pair-by-pair close arrangement mode.

[0056] In this embodiment, the four bag expanding rod bodies 3003 realize the horizontal movement of expanding and opening the bag opening of the ton bag 4001 through a bag expanding rod body operating assembly 3004.

[0057] Preferably, the number of bag-expanding rod body operating assemblies 3004 on the lifting frame 3001 is two groups, and the two groups of bag-expanding rod body operating assemblies 3004 are respectively a first group of bag-expanding rod body operating assemblies 3006 and a second group of bag-expanding rod body operating assemblies 3007, and the first group of bag-expanding rod body operating assemblies 3006 and the second group of bag-expanding rod body operating assemblies 3007 are arranged in layers according to the up-down positions on the lifting frame 3001.

[0058] In this embodiment, a retreat stopper is arranged between the bag-expanding rod body operating assembly 3004 and the bag mouth fixing and tightening assembly 4002 to facilitate the smooth exit of the bag supporting mechanical arm 39 after the bagging of the bag supporting and bagging device 63 is completed.

[0059] The use method of this embodiment is as follows:

[0060] (1) Bagging: After the bag mouth of the ton bag 4001 is opened on the bag opening station (bag opening frame) of the automatic packaging machine, the bag supporting and bagging moving frame 31 moves backward under the action of the moving frame push-pull cylinder 60, so that the bag supporting mechanical palms 61 on the pair of bag supporting mechanical arms 39 at the lower end of the bag supporting and bagging moving frame 31 are inserted into the bag mouth of the ton bag, and then the bag mouth of the ton bag located on the bag opening frame is supported and tensioned under the action of the screw rod rotation driving motor 47; then the bag supporting and bagging moving frame 31 moves forward, and after reaching the position, the pair of bag supporting mechanical arms 39 swing upward by a certain angle along the front-back direction, so that the bag mouth of the ton bag 4001 is sleeved on the lifting type filling cylinder 3002 of the packaging machine main machine, and at this time, the four bag-expanding rods 3003 close to the lifting type filling cylinder 3002 are sleeved in the bag mouth of the ton bag 4001, thereby completing the bagging action of the bag mouth of the ton bag;

[0061] (2) Automatic fixing after bagging: after the bagging of the bag mouth of the ton bag to the lifting type filling cylinder 3002, the bag mouth fixing cylinder 4004 acts, and the pressing head 4005 at the front end of the piston rod of the bag mouth fixing cylinder 4004 presses against the bag mouth to fix the bag mouth;

[0062] (3) Withdrawal of the bag supporting mechanical arm: after the bag mouth of the ton bag 4001 is fixed, the bag supporting mechanical arm 39 swings upward by an angle under the action of the swing control motor 55, so as to be separated from the bag mouth of the ton bag 4001, then moves backward away from the lifting type filling cylinder 3002 under the action of the moving frame push-pull cylinder 60, and the bag supporting mechanical arm 39 returns to the initial vertical position under the action of the swing control motor 55;

[0063] (4) After the bagging, the automatic tightening of the bag opening: after the bagging mechanical arm 39 is withdrawn, the bag opening fixing and tightening assembly 4002 is actuated, so that the half clamp 4006 at the front end of the piston rod of the bag opening tightening cylinder 4003 clamps and tightens the bag opening of the ton bag 4001. When the bag opening is clamped, the four bag expanding rods 3003 enter the U-shaped groove 4013 through the bag wall of the bag opening, thereby realizing the automatic tightening and closing of the ton bag bag opening.

[0064] (5) Feeding: after the bag opening is tightened, the ton bag 4001 is weighed and fed by the feeding device on the packaging machine main machine;

[0065] (6) Weighing and rechecking: after the feeding is completed, the elevator frame 1001 is lowered, and the ton bag 4001 is placed on the weighing and rechecking conveying table (not shown in the figure) below the packaging machine main machine frame 1001. The bag opening fixing cylinder 4004 is loosened, and the bag opening tightening cylinder 4003 is loosened, so that the pressure head 4005 and the half clamp 4006 are separated from the bag opening of the ton bag 4001. At this time, the bag expanding rod body operating assembly 3004 is actuated, and the four bag expanding rods 3003 are used to expand and open the bag opening of the ton bag 4001. After the bag opening is opened, the four bag expanding rods 3003 are offset by a distance, so that the lifting type filling cylinder 3002 and the four bag expanding rods 3003 are both separated from the bag opening. Finally, the weighing and rechecking conveying table accurately weighs and rechecks the ton bag 4001.

[0066] (7) Supplemental material: in the case of insufficient material (insufficient bag weight) in the weighing and rechecking, the ton bag 4001 is supplemented by the feeding device on the packaging machine main machine, thereby improving the accuracy of feeding.

[0067] The above only describes the preferred embodiments of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the technical principles of the present application, several improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine, characterized in that, The system includes a lifting frame mounted on the main frame of an automatic packaging machine, a lifting filling cylinder fixed on the lifting frame, and a pair of bag opening fixing and tightening assemblies fixed on the lifting frame and positioned on both sides of the lower part of the lifting filling cylinder. Each bag opening fixing and tightening assembly includes a bag opening tightening cylinder and a bag opening fixing cylinder arranged vertically. The piston rod of the bag opening fixing cylinder has a pressure head at its front end for fixing the bag opening of the ton bag fitted on the lower outer circle of the lifting filling cylinder. The piston rod of the bag opening tightening cylinder has a clamp at its front end for tightening the bag opening of the ton bag fixed on the lower outer circle of the lifting filling cylinder. A weighing and verification conveyor is provided below the main frame of the packaging machine. The main frame of the automatic packaging machine is also provided with a bag opening shaping and holding mechanism for replenishment to prevent the lifting filling cylinder from contacting the bag opening of the ton bag during weighing and verification and replenishment. The clamp includes a clamp support frame and a clamp tightening sleeve fixed on the clamp support frame. The clamp tightening sleeve has clamp flanges at both ends for a pair of clamps to mate with each other on the clamp surface. The bag opening shaping and holding mechanism for replenishing materials includes four bag expanding rods disposed around the lifting filling cylinder and close to the lifting filling cylinder. The four bag expanding rods are arranged in pairs close to each other on the front and rear sides of the lifting filling cylinder. When bagging, the four bag expanding rods and the lifting filling cylinder are together placed inside the bag opening of the ton bag. A U-shaped groove is opened on the clamp on the clamp surface located on the clamp flange of the clamp tightening sleeve to avoid the bag expanding rods when the bag opening is tightened after bagging. The U-shaped groove is located in the middle of the clamp flange surface and is spaced apart from the inner hole of the clamp tightening sleeve.

2. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 1, characterized in that, It also includes a bag-opening and bag-fitting device installed next to the main machine frame for opening the bag opening of the ton bag and fitting it onto the lifting filling cylinder; the bag-opening and bag-fitting device includes a fixed ton bag transfer frame, a bag-opening and bag-fitting movable frame that is movably installed on the ton bag transfer frame via a pair of linear guide rails, and a bag-opening and bag-fitting assembly connected to the bag-opening and bag-fitting movable frame.

3. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 2, characterized in that, The bag-supporting and bag-packing assembly includes a U-shaped rotating arm rotatably mounted at the lower end of the bag-supporting and bag-packing moving frame with its opening facing downwards, a pair of guide rods fixed between the U-shaped openings of the U-shaped rotating arm and arranged in parallel intervals, and a pair of bag-supporting robotic arms movably mounted on the pair of guide rods; a positive and negative lead screw is connected between the pair of bag-supporting robotic arms, and the positive and negative lead screws are respectively provided with positive and negative threaded sections with opposite helical directions; one of the bag-supporting robotic arms is threadedly connected to the positive threaded section of the positive and negative lead screw, and the other bag-supporting robotic arm is threadedly connected to the negative threaded section of the positive and negative lead screw; a lead screw rotation drive motor is provided on the U-shaped rotating arm for driving the positive and negative lead screws to rotate; and a rotating arm swing control motor is provided on the bag-supporting and bag-packing moving frame for driving the pair of bag-supporting robotic arms to swing up and down along the bag-packing direction.

4. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 1, characterized in that, The piston rod of the bag opening fixing cylinder is provided with a stud at the front end, and the top pressure head is fixed to the stud by threaded connection and locked by locking nut.

5. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 4, characterized in that, The top pressure head includes a rigid connecting ring threaded to a stud at the front end of the piston rod and a top pressure cylinder fixed at the front end of the rigid connecting ring.

6. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 5, characterized in that, The top pressure cylinder is an elastic rubber top pressure cylinder, and the half-tightening sleeve is an elastic rubber half-tightening sleeve.

7. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 1, characterized in that, The bag opening fixing cylinder is a single-axis cylinder, and the bag opening tightening cylinder is a three-axis cylinder.

8. The bag opening fixing and tightening linkage device in a fully automatic solid fluid packaging machine according to claim 1, characterized in that, The four bag-expanding rods achieve the translational movement of expanding and opening the bag opening through the bag-expanding rod control assembly; the working steps of the bag opening fixing and tightening linkage device are as follows: (1) Bag fitting: After the bag opening of the ton bag is opened at the bag opening station of the automatic packaging machine, the bag supporting and bag fitting moving frame moves backward under the action of the moving frame push-pull cylinder, so that the bag supporting mechanical hands on the pair of bag supporting mechanical arms at the lower end of the bag supporting and bag fitting moving frame are inserted into the bag opening of the ton bag. Then, under the action of the screw rotation drive motor, the bag opening of the ton bag located on the bag opening frame is supported and tightened. Then the bag supporting and bag fitting moving frame moves forward. After it is in place, the pair of bag supporting mechanical arms swing upward at a certain angle in the front-back direction, so that the bag opening of the ton bag is covered on the lifting filling cylinder of the main machine of the packaging machine. At this time, the four bag expanding rods close to the lifting filling cylinder are also fitted into the bag opening of the ton bag, thus completing the bag fitting action of the ton bag opening. (2) Automatic fixing after bagging: After the bag mouth of the ton bag is put onto the lifting filling cylinder, the bag mouth fixing cylinder is activated. The top pressure head at the front end of the piston rod of the bag mouth fixing cylinder presses against the bag mouth to fix the bag mouth. (3) Retraction of the bag-supporting robotic arm: After the bag opening of the ton bag is fixed, under the action of the swing control motor, the bag-supporting robotic arm swings upward at an angle to separate from the bag opening of the ton bag. Then, under the action of the push-pull cylinder of the moving frame, it moves backward and away from the lifting filling cylinder. Under the action of the swing control motor, the bag-supporting robotic arm returns to the initial vertical position. (4) Automatic sealing of bag opening after bagging: After the bag-supporting robotic arm retracts, the bag opening fixing and sealing component moves, causing the half clamp at the front end of the piston rod of the bag opening sealing cylinder to hold and clamp the bag opening of the ton bag. When the bag opening is clamped, the four bag-expanding rods enter the U-shaped groove through the bag wall of the bag opening, thereby realizing the automatic sealing and closing of the ton bag opening. (5) Feeding: After the bag opening is tied tightly, the ton bag is weighed and fed through the feeding device on the main packaging machine. (6) Weighing and verification: After the material is added, the lifting frame is lowered and the ton bag is placed on the weighing and verification conveyor table below the main frame of the packaging machine. The bag mouth fixing cylinder is released and the bag mouth tightening cylinder is released, so that the top pressure head and half clamp are separated from the bag mouth of the ton bag. At this time, the bag expansion rod control component is activated, and the bag mouth of the ton bag is expanded and opened by the four bag expansion rods. After the bag mouth is opened, the four bag expansion rods are offset by a certain distance, so that the lifting filling cylinder and the four bag expansion rods are separated from the bag mouth. Finally, the weighing and verification conveyor table accurately weighs and verifies the ton bag. (7) Replenishment: If there is a shortage of material in the weighing check, the ton bag is replenished by the feeding device on the main machine of the packaging machine, thereby improving the accuracy of feeding.

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