A vacuum packaging machine

Abstract

The present invention discloses a vacuum packaging machine, comprising a frame, a horizontally arranged intermittently rotating shaft mounted in the middle of the frame, a plurality of workstations spaced apart along the circumference of the shaft, each workstation being fixedly connected to one end of a support arm, the other end of which is pivotally connected to the shaft, a bracket being fixedly connected to one side of the shaft, and a lower portion of each workstation being hingedly connected to one end of a positioning cylinder, the other end of which is hingedly connected to the bracket, the movement of which drives the workstation to rotate relative to the shaft; a material bag opening clamping mechanism mounted on each workstation; a cover housing movable up and down mounted on the frame above the shaft, the cover housing moving downward to cooperate with a workstation to form a sealed space, an exhaust duct being provided on the cover housing connecting the sealed space, and a material bag opening sealing mechanism being mounted between the cover housing and the workstation. The present invention enables multi-station flow-line packaging operations, achieves high packaging efficiency, and has a compact structure and small space occupation.

Description

Technical Field

[0001] The invention relates to the technical field of packaging machinery manufacturing, in particular to a vacuum packaging machine. Background Art

[0002] Nowadays, a large portion of granular materials, such as rice, are packaged using vacuum packaging, which can extend their shelf life. Consequently, a variety of vacuum packaging machines have emerged on the market. For example, patent number ZL202122352017.1, entitled "A Vacuum Packaging Machine for Rice Processing," was published on April 26, 2022. The patent comprises a base, a vacuum mechanism fixedly connected to one end of the bracket, a limit mechanism fixedly connected to the interior of the vacuum mechanism, and a drive mechanism rotatably connected to the interior of the limit mechanism. The vacuum packaging machine for rice processing uses a telescopic member to move the suction pipe to the appropriate position. The drive member then drives the second and first screws to rotate in opposite directions, causing the pressure plate and placement plate to move toward each other, clamping the suction pipe and the packaging bag. This allows for clamping and securing a variety of packaging bags, rather than being limited to clamping only one type or size of bag. This improves the device's practicality and, to a certain extent, its comprehensiveness. The device also offers excellent clamping performance and can simultaneously move toward or relative to each other, further enhancing its operating efficiency. However, this type of vacuum packaging cannot achieve flow-type multi-station operation, and the packaging efficiency is still low. Existing vacuum packaging equipment that can form multiple stations and flow operations is usually complex in structure and occupies a large area. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a vacuum packaging machine which can form a multi-station flow-type packaging operation, has high packaging efficiency, and has a compact structure and occupies less space.

[0004] To achieve the above-mentioned object, the technical solution of the present invention is as follows: a vacuum packaging machine comprises a frame, a rotating shaft with a horizontal axis and intermittent rotation is installed in the middle of the frame, a plurality of workstations are arranged at intervals along the circumferential direction of the rotating shaft, each workstation is fixedly connected to one end of a support arm, the other end of the support arm is pivotally connected to the rotating shaft, a bracket is also fixedly connected to one side of the rotating shaft, the lower part of each workstation is also hinged to one end of a positioning cylinder, the other end of the positioning cylinder is hinged to the bracket, and the position cylinder is driven to rotate the workstation and the support arm relative to the rotating shaft; each workstation is equipped with a bag opening clamping mechanism;

[0005] The frame is equipped with a cover shell that can move up and down on the rotating shaft. When the cover shell moves down, a position adjustment cylinder is used to adjust the position of a work station unit so that the cover shell can cooperate with the work station unit to form a sealed space. The cover shell is provided with an exhaust pipe connected to the sealed space; a sealing mechanism for the bag opening of the material bag is also installed between the cover shell and the work station unit; after the material bag is sealed, the vacuum in the sealed space can be removed; after the cover shell moves up, the position adjustment cylinder is used again to tilt the work station unit to allow the vacuumed and sealed material bag to slide out.

[0006] A further improvement is that the housing is also equipped with a bag shaping mechanism, which includes a pressure plate and two pressure cylinders. The housings of the two pressure cylinders are respectively mounted on the upper end surface of the housing. The piston rods of the two pressure cylinders extend into the housing and connect to the pressure plates. Driven by the piston rods of the two pressure cylinders, the pressure plates can press the bag. An eccentric vibrating mechanism driven by a vibration motor is installed on the pressure plate. Through vibration shaping, the packaging quality of the bag is further improved.

[0007] Furthermore, it is preferred that there are three workstation units, each forming three workstations: a bag loading station, a vacuuming, shaping, sealing, bag unloading station, and a waiting station. Each time the rotating shaft rotates 120°, the positioning cylinder actuates, driving the workstation units and support arms to rotate 40° relative to the rotating shaft. This improves the overall compactness while ensuring packaging efficiency. With the intermittent rotation of the rotating shaft, each workstation unit can cycle through the bag loading station, vacuuming, shaping, sealing, bag unloading station, and waiting station.

[0008] As a further improvement, a weighing mechanism is installed on the upper part of the frame, and a discharge pipe connected to the weighing mechanism is provided on one side of the frame. The weighed material falls into the packaging bag through the discharge pipe to form a material bag. This can improve the packaging accuracy and efficiency.

[0009] Furthermore, a conveyor belt is provided on one side of the frame, which supports the material bag and moves it to a workstation unit. By supporting the material bag and moving it with the conveyor belt, the labor intensity of the operator is further reduced.

[0010] Furthermore, the front and rear sides of the discharging pipe are respectively equipped with a front bag clamping cylinder and a rear bag clamping cylinder, one end of the front bag clamping cylinder is hinged to the upper front part of the discharging pipe, and the middle front part of the discharging pipe is hinged to a hinge point of a front clamping frame, the other end of the front bag clamping cylinder is hinged to another hinge point of the front clamping frame, and another hinge point on the front clamping frame is hinged with a front pressure block, and the action of the rear bag clamping cylinder drives the rear clamping frame to rotate so that the front pressure block cooperates with the rear side of the lower part of the discharging pipe to clamp the rear of the packaging bag. This ensures that the packaging bag will not fall off when the material falls into the packaging bag, and also reduces the labor intensity of the operator.

[0011] A further improvement is that the frame is also equipped with a material receiving bag mechanism that connects to the workstation unit unloading. The material receiving bag mechanism includes a material receiving trough and a material receiving cylinder pivotally connected to the frame on both sides. The material receiving cylinder housing is pivotally connected to the frame. The material receiving trough is fixedly connected to one end of a driving arm, and the other end of the driving arm is hinged to the piston rod of the material receiving cylinder. The movement of the material receiving cylinder drives the material receiving trough to rotate the material receiving bag or make way for the workstation unit to rotate. The material receiving bag mechanism can effectively prevent the vacuumed and sealed material bag from being damaged or deformed.

[0012] Furthermore, the frame is also equipped with a receiving platform connected to the receiving trough. The two sides of one end of the receiving platform are pivotally connected to the frame. The two sides of the middle of the receiving platform are respectively hinged to one end of an adjustable length pull rod. The other end of the pull rod is hinged to the frame. The receiving platform receives the material bags dropped from the receiving trough, making it easy to adjust the receiving angle and remove the material bags.

[0013] Preferably, the workstation unit includes a base plate and a pad, the pad is parallel to the base plate and is fixedly connected to one side of the base plate by multiple support blocks, the clamping mechanism includes two first clamping cylinders and two second clamping cylinders installed on the other side of the base plate, the piston rods of the two first clamping cylinders extend to one side of the base plate and are jointly fixed to a first clamping block, a plurality of clamping rubber blocks are installed at intervals on the clamping end surface of the first clamping block, the piston rods of the two second clamping cylinders also extend to one side of the base plate and are jointly fixed to a second clamping block, a clamping rubber strip is installed on the second clamping block, after the two first clamping cylinders and the two second clamping cylinders are actuated, the first clamping block and the second clamping block cooperate with the multiple clamping rubber blocks and the clamping rubber strip to clamp the bag opening of the material bag, and allow ventilation inside and outside the material bag;

[0014] The sealing mechanism comprises two sealing cylinders mounted on the housing. Their piston rods extend into the housing and are connected to a sealing block equipped with an electric heating tube. The sealing block and the second clamping block work together to heat-seal the bag opening. This station unit, through the coordination of a backing plate and a clamping mechanism, ensures accurate and secure clamping of the bag opening. After vacuuming and sealing, the bag can be easily removed from between the first and second clamping blocks, ensuring reliable sealing and unloading.

[0015] As a further improvement, the piston rods of the two second clamping cylinders further extend from the other ends of the two second clamping cylinder housings and are jointly fixedly connected to a limit rod, and one end of a screw is fixedly connected to a limit block. When the two second clamping cylinders are actuated and the second clamping block moves away from the base plate, the limit block presses against the limit rod to limit the stroke of the piston rods of the two second clamping cylinders;

[0016] A limit adjustment motor is mounted on the other side of the base plate. This motor drives a driving gear through a speed reducer. A nut engages a screw rod, which in turn secures a driven gear. This allows for easy adjustment of the stroke of the piston rods of the two second clamping cylinders, and thus the position of the second clamping block, to accommodate bags of varying thickness, enhancing the machine's versatility.

[0017] The present invention utilizes a horizontally arranged rotating shaft that intermittently rotates, with multiple workstations spaced apart along the circumference of the shaft. Each workstation is fixedly connected to one end of a support arm, the other end of which is pivotally connected to the rotating shaft. A bracket is also fixedly connected to one side of the rotating shaft. The lower portion of each workstation is also hinged to one end of a positioning cylinder, the other end of which is hinged to the bracket. The positioning cylinder drives the workstation and the support arm to rotate relative to the rotating shaft. Thus, through the intermittent rotation of the rotating shaft, the multiple workstations can switch positions, operate in a cycle, form an assembly line, and improve packaging efficiency. When the cover moves downward, the positioning cylinder adjusts the position of a workstation so that the cover and the workstation cooperate to form a sealed space. The cover is provided with an exhaust pipe connecting the sealed space. A sealing mechanism for the bag opening is also installed between the cover and the workstation. After the bag is sealed, the sealed space can be de-vacuumed. After the cover moves upward, the positioning cylinder is activated again to tilt the workstation, allowing the vacuumed and sealed bag to slide out. This allows vacuuming, sealing, and unloading to be performed at a single station, resulting in a compact overall structure and a small footprint. Furthermore, by installing a bag shaping mechanism on the housing, vacuuming, shaping, sealing, and unloading can be performed at a single station, further enhancing the compactness of the structure, achieving more functions, and improving packaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a stereogram of the present invention;

[0019] Figure 2 It is a three-dimensional diagram of the hidden frame of the present invention;

[0020] Figure 3 This is a top view of the workstation unit of the present invention;

[0021] Figure 4 yes Figure 3 C-direction view;

[0022] Figure 5 It is a three-dimensional diagram of the workstation unit of the present invention;

[0023] Figure 6 It is a top view of the components installed in the cover of the present invention;

[0024] Figure 7 yes Figure 6 AA cross-sectional view;

[0025] Figure 8 It is a three-dimensional diagram of the components installed in the cover of the present invention;

[0026] Figure 9 yes Figure 2 A B-direction view of a workstation unit in a vacuum state;

[0027] Figure 10 yes Figure 2 A B-direction view of a workstation unit in the unloading state;

[0028] Figure 11 yes Figure 2 View from direction B of a workstation unit turning to the waiting state after unloading. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Figures 1 to 11 As shown, a vacuum packaging machine includes a frame 1, with a rotating shaft 2 with a horizontal axis installed in the middle of the frame 1. The rotating shaft 2 is driven to rotate intermittently by a motor 21. The motor 21 is connected to the rotating shaft 2 through a reducer and a sprocket chain transmission mechanism. Three workstation units 3 are arranged at intervals along the circumferential direction of the rotating shaft 2. Each workstation unit 3 is fixedly connected to one end of a support arm 31, and the other end of the support arm 31 is pivotally connected to the rotating shaft 2. A bracket 22 is also fixedly connected to one side of the rotating shaft 2. The lower part of each workstation unit 3 is also hinged to one end of a positioning cylinder 4, and the other end of the positioning cylinder 4 is hinged to the bracket 22. The position adjustment cylinder 4 is driven to rotate the workstation unit 3 and the support arm 31 relative to the rotating shaft 2 by the action of the positioning cylinder 4; each workstation unit 3 is equipped with a bag opening clamping mechanism 30 of a material bag 10;

[0031] The frame 1 is provided with a cover shell 5 which can be moved up and down on the rotating shaft 2. The cover shell 5 is generally a square cover body. The lower end surface of the cover shell 5 is provided with a sealing gasket 50. The two sides of the cover shell 5 are connected to the two vertical rails of the frame 1 through a slider 51 respectively. Two lifting cylinders 52 are installed on the frame 1. The piston rods of the two lifting cylinders 52 are connected to the two sides of the cover shell 5 and can drive the cover shell 5 to move up and down; when the cover shell 5 moves down, the position of a work station unit 3 is adjusted to a horizontal state through the action of a positioning cylinder 4 so that the cover shell 5 can cooperate with the work station unit 3 to form a sealed space, and an exhaust pipe 53 connecting the sealed space is provided on the cover shell 5; a sealing mechanism 6 for the bag mouth of the material bag 10 is also installed between the cover shell 5 and the work station unit 3; after the cover shell 5 moves up, the positioning cylinder 4 is moved again to tilt the work station unit 3 to allow the vacuumed and sealed material bag 10 to slide out. To facilitate removal of the vacuum state in the sealed space after the material bag 10 is sealed, the housing 5 and / or the exhaust pipe 53 may be provided with an air inlet valve 54 communicating with the sealed space. In this embodiment, both the housing 5 and the exhaust pipe 53 are provided with an air inlet valve 54 communicating with the sealed space, and the exhaust pipe 53 is connected to the air intake of a vacuum pump. The exhaust pipe 53 may also be connected to a vacuum pump via a vacuum tank.

[0032] The cover shell 5 is also equipped with a material bag shaping mechanism 7, which includes a pressing plate 71 and two pressing cylinders 72. The shells of the two pressing cylinders 72 are respectively installed on the upper end surface of the cover shell 5. The piston rods of the two pressing cylinders 72 extend into the cover shell 5 and are respectively connected to the pressing plates 71. The pressing plate 71 can press the material bag 10 under the drive of the piston rods of the two pressing cylinders 72. An eccentric vibration mechanism driven by a vibration motor 73 is installed on the pressing plate 71.

[0033] The three workstation units 3 form three workstations, namely the loading bag station, the vacuuming, shaping, sealing, unloading bag station and the waiting station. The rotating shaft 2 rotates 120° each time, and when the positioning cylinder 4 is activated, the workstation unit 3 and the support arm 31 are driven to rotate 40° relative to the rotating shaft 2.

[0034] A weighing mechanism 11 is mounted on the upper portion of the frame 1 , and a discharge pipe 8 connected to the weighing mechanism 11 is provided on one side of the frame 1 . The weighed material passes through the discharge pipe 8 and falls into the packaging bag to form a material bag 10 .

[0035] A conveyor belt 12 is also installed on one side of the frame 1. It supports the material bags 10 and moves them to a workstation 3. The conveyor belt 12 can also be adjusted in height by rotating a handwheel 121, facilitating the support and conveyance of material bags of varying heights. Rotating the handwheel 121 drives the conveyor belt 12 up and down via a ball screw mechanism.

[0036] The front and rear sides of the discharge pipe 8 are respectively equipped with a front bag clamping cylinder 81 and a rear bag clamping cylinder 82. One end of the front bag clamping cylinder 81 is hinged to the upper part of the front side of the discharge pipe 8, and the middle part of the front side of the discharge pipe 8 is hinged to a hinge point of a front clamping frame 83. The other end of the front bag clamping cylinder 81 is hinged to another hinge point of the front clamping frame 83. A front pressure block 831 is hinged to another hinge point on the front clamping frame 83. The action of the front bag clamping cylinder 81 drives the front clamping frame 83 to rotate so that the front pressure block 831 and the discharge pipe 8 are connected. The lower front part cooperates to clamp the front part of the packaging bag; one end of the rear bag clamping cylinder 82 is hinged to the upper rear part of the discharge pipe 8, and the middle rear part of the discharge pipe 8 is hinged to a hinge point of a rear clamping frame 84, and the other end of the rear bag clamping cylinder 82 is hinged to another hinge point of the rear clamping frame 84, and another hinge point on the rear clamping frame 84 is hinged with a rear pressure block 841. The action of the rear bag clamping cylinder 82 drives the rear clamping frame 84 to rotate so that the rear pressure block 841 cooperates with the rear side of the lower part of the discharge pipe 8 to clamp the rear of the packaging bag.

[0037] The frame 1 is also provided with a material receiving bag mechanism 9 for connecting the work station unit 3 to unload materials. The material receiving bag mechanism 9 includes a material receiving trough 91 and a material receiving cylinder 92 pivotally connected to the frame 1 on both sides. The shell of the material receiving cylinder 92 is pivotally connected to the frame 1. The material receiving trough 91 is fixedly connected to one end of a driving arm 93, and the other end of the driving arm 93 is hinged to the piston rod of the material receiving cylinder 92. The movement of the material receiving cylinder 92 drives the material receiving trough 91 to rotate the material bag 10 or make way for the work station unit 3 to rotate.

[0038] The frame 1 is also equipped with a receiving platform 13 that connects to the receiving chute 91. The receiving platform 13 is pivotally connected to the frame 1 at one end. The center of the receiving platform 13 is hinged to one end of an adjustable-length pull rod 131 on either side. The other end of the pull rod 131 is hinged to the frame 1. The receiving platform 13 receives the material bags 10 that fall from the receiving chute 91. This facilitates the operator to remove the vacuumed and sealed material bags from the receiving platform 13. The receiving platform 13 can also be configured as a conveyor belt to transport the vacuumed and sealed material bags 10 to a more distant location.

[0039] The work station unit 3 includes a base plate 32 and a pad 33. The pad 33 is parallel to the base plate 32 and is fixedly connected to one side of the base plate 32 by a plurality of support blocks 331. The clamping mechanism 30 includes two first clamping cylinders 34 and two second clamping cylinders 35 installed on the other side of the base plate 32. The piston rods of the two first clamping cylinders 34 extend to one side of the base plate 32 and are jointly fixed to a first clamping block 36. A plurality of clamping rubber blocks 361 are installed at intervals on the clamping end surface of the first clamping block 36. The piston rods of the two second clamping cylinders 35 also extend to one side of the base plate 32 and are jointly fixed to a second clamping block 37. A clamping rubber strip 371 is installed on the second clamping block 37. After the two first clamping cylinders 34 and the two second clamping cylinders 35 are actuated, the first clamping block 36 and the second clamping block 37 clamp the bag opening of the material bag 10 through the plurality of clamping rubber blocks 361 and the clamping rubber strip 371, and allow ventilation inside and outside the material bag 10.

[0040] The sealing mechanism 6 includes two sealing cylinders 61 installed on the cover shell 5. The piston rods of the two sealing cylinders 61 extend into the cover shell 5 and are jointly connected to a sealing block 62. The sealing block 62 is equipped with an electric heating tube. The sealing block 62 cooperates with the second clamping block 37 to perform hot-melt sealing on the bag mouth of the material bag 10.

[0041] The piston rods of the two second clamping cylinders 35 extend from the other ends of their housings and are connected to a stop rod 38. One end of a screw rod 39 is connected to a stop block 391. When the two second clamping cylinders 35 are in operation and the second clamping block 37 moves away from the base plate 32, the stop block 391 presses against the stop rod 38 to limit the travel of the piston rods of the two second clamping cylinders 35. This allows for the clamping of bags 10 of varying thicknesses. This ensures that the bag openings are clamped at half the thickness of the bag 10, creating a more optimal clamping position and improving both clamping reliability and sealing reliability after vacuuming.

[0042] A limit adjustment motor 3a is mounted on the other side of the base plate 32. This motor drives a driving gear 3c through a speed reducer 3b. A nut is attached to a screw 39, which is secured to a driven gear 3d. The driving gear 3c meshes with the driven gear 3d. When the limit adjustment motor 3a is activated, the driving gear 3c rotates the driven gear 3d, which in turn moves the screw 39, moving the limit block 391. This allows for adjustment of the position of the limit block 391, thereby facilitating adjustment of the stroke of the piston rods of the two second clamping cylinders 35. This further enhances the versatility of the device and expands its applicability to a wider range of packaging applications.

[0043] The frame 1 is also provided with a controller 20 for controlling the actions of the various mechanisms.

[0044] The working process of this embodiment is as follows: the bag mouth of the plastic packaging bag is put on the discharge pipe 8, the front bag clamping cylinder 81 is actuated to drive the front clamping frame 83 to rotate so that the front pressing block 831 cooperates with the lower front part of the discharge pipe 8 to clamp the front part of the packaging bag; the rear bag clamping cylinder 82 is simultaneously actuated to drive the rear clamping frame 84 to rotate so that the rear pressing block 841 cooperates with the rear side of the lower part of the discharge pipe 8 to clamp the rear part of the packaging bag; the granular material such as rice is weighed by the weighing mechanism 11 and falls into the plastic packaging bag through the discharge pipe 8 to form a material bag 10;

[0045] The material bag 10 is transported to a workstation unit 3 via a conveyor belt 12. The operator inserts the bag opening of the material bag 10 between the first clamping block 36 and the second clamping block 37. The two first clamping cylinders 34 and the two second clamping cylinders 35 operate simultaneously. The first clamping block 36 and the second clamping block 37 clamp the bag opening of the material bag 10 through multiple clamping rubber blocks 361 and clamping rubber strips 371, and allow ventilation inside and outside the material bag 10. At this time, the workstation unit 3 holding the material bag 10 is still in the material bag loading position;

[0046] Then, if combined Figure 1 、 Figure 9 As shown, the motor 21 rotates to drive the shaft 2 to rotate 120° counterclockwise, and the material bag 10 follows the station unit 3 to rotate to the bottom of the cover shell 5. The station unit 3 rotates to the vacuum, shaping, sealing, and unloading station. The adjustment cylinder 4 connected to the station unit 3 drives the station unit 3 and the support arm 31 to rotate 40° relative to the shaft 2. The position of the station unit 3 is adjusted so that the bottom plate 32 is in a horizontal state. The two lifting cylinders 52 act at the same time to pull the cover shell 5 downward, and the cover shell 5 cooperates with the bottom plate 32 of the station unit 3 to form a close connection. The material bag 10 is in the sealed space, and then the vacuum pump is started to evacuate the sealed space through the exhaust pipe 53 to remove the air in the material bag 10. At the same time, the two pressing cylinders 72 of the material bag shaping mechanism 7 drive the pressing plate 71 to press the material bag 10, and the vibration motor 73 on the pressing plate 71 drives the eccentric vibration mechanism to vibrate and shape the material bag; after the vacuum reaches the set time, the two sealing cylinders 61 drive the sealing block 62 to press down, and the sealing block 62 cooperates with the second clamping block 37 to perform hot-melt sealing on the bag mouth of the material bag 10.

[0047] Then the air inlet valve 54 opens, the cover 5 is ventilated to the atmosphere, and the vacuum is removed. The two lifting cylinders 52 are actuated simultaneously to drive the cover 5 upward. The receiving cylinder 92 is actuated to drive the receiving trough 91 to rotate clockwise to prepare for receiving the material. The two first clamping cylinders 34 and the two second clamping cylinders 35 are actuated simultaneously. The multiple clamping rubber blocks 361 and the clamping rubber strips 371 release the bag opening of the material bag 10. The adjusting cylinder 4 is actuated again to drive this station unit 3 to rotate 40° back to an inclined state. After vacuuming and sealing, the material bag 10 slides from between the first clamping block 36 and the second clamping block 37 to the receiving trough 91, and then falls onto the receiving platform 13. Figure 10 、 Figure 11 shown.

[0048] Next, the receiving cylinder 92 activates again, driving the receiving chute 91 to rotate counterclockwise to make way. The motor 21 rotates, further driving the rotating shaft 2 to rotate counterclockwise 120 degrees. After unloading, the workstation unit 3 is in the waiting position, while the other two workstation units 3, one of which is in the loading position, and the other is in the vacuuming, shaping, sealing, and bag unloading position. As the rotating shaft 2 intermittently rotates 120 degrees, multiple workstation units 3 form a continuous cycle operation, which improves packaging efficiency.

[0049] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, it should be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined by the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A vacuum packaging machine, comprising a frame, characterized in that: A rotating shaft with a horizontal axis and intermittent rotation is installed in the middle of the frame. A plurality of workstation units are arranged at intervals along the circumferential direction of the rotating shaft. Each workstation unit is fixedly connected to one end of a support arm, the other end of the support arm is pivotally connected to the rotating shaft, and a bracket is also fixedly connected to one side of the rotating shaft. The lower part of each workstation unit is also hinged to one end of a positioning cylinder, and the other end of the positioning cylinder is hinged to the bracket. The positioning cylinder is driven to drive the workstation unit and the support arm to rotate relative to the rotating shaft; each workstation unit is equipped with a bag opening clamping mechanism; The frame is equipped with a cover that can move up and down on the rotating shaft. When the cover moves down, a position adjustment cylinder is actuated to adjust the position of a workstation unit so that the cover can cooperate with the workstation unit to form a sealed space. The cover is provided with an exhaust pipe connected to the sealed space; a sealing mechanism for the bag opening of the material bag is also installed between the cover and the workstation unit; after the material bag is sealed, the vacuum in the sealed space can be removed; after the cover moves up, the position adjustment cylinder is actuated again to tilt the workstation unit to allow the vacuumed and sealed material bag to slide out; The cover is also provided with a material bag shaping mechanism, which includes a pressing plate and two pressing cylinders. The housings of the two pressing cylinders are respectively mounted on the upper end surfaces of the cover, and the piston rods of the two pressing cylinders extend into the cover and are respectively connected to the pressing plates. The pressing plate can press the material bag under the drive of the piston rods of the two pressing cylinders, and an eccentric vibrating mechanism driven by a vibration motor is installed on the pressing plate. The frame is also provided with a material receiving bag mechanism for connecting the workstation unit to unload the material. The material receiving bag mechanism includes a material receiving trough and a material receiving cylinder pivotally connected to the frame on both sides. The material receiving cylinder shell is pivotally connected to the frame. The material receiving trough is fixedly connected to one end of a driving arm, and the other end of the driving arm is hinged to the piston rod of the material receiving cylinder. The action of the material receiving cylinder drives the material receiving trough to rotate the material bag or make way for the workstation unit to rotate; The workstation unit includes a base plate and a pad, the pad is parallel to the base plate and is fixedly connected to one side of the base plate by multiple support blocks, and the clamping mechanism includes two first clamping cylinders and two second clamping cylinders installed on the other side of the base plate, the piston rods of the two first clamping cylinders extend to one side of the base plate and are jointly fixed to a first clamping block, a plurality of clamping rubber blocks are installed at intervals on the clamping end surface of the first clamping block, the piston rods of the two second clamping cylinders also extend to one side of the base plate and are jointly fixed to a second clamping block, and a clamping rubber strip is installed on the second clamping block. After the two first clamping cylinders and the two second clamping cylinders are actuated, the first clamping block and the second clamping block cooperate with the clamping rubber blocks and the clamping rubber strip to clamp the bag opening of the material bag, and allow ventilation inside and outside the material bag; The sealing mechanism includes two sealing cylinders installed on the cover shell. The piston rods of the two sealing cylinders extend into the cover shell and are jointly connected to a sealing block. The sealing block is equipped with an electric heating tube. The sealing block cooperates with the second clamping block to perform hot-melt sealing on the bag opening.

2. A vacuum packaging machine according to claim 1, characterized in that: There are three workstation units, which form three workstations, namely, the loading station, vacuuming, shaping, sealing, unloading station and waiting station. The rotating shaft rotates 120° each time, and when the positioning cylinder is activated, the workstation unit and the support arm are driven to rotate 40° relative to the rotating shaft.

3. The vacuum packaging machine according to claim 1, characterized in that: A weighing mechanism is installed on the upper part of the frame, and a discharge pipe connected to the weighing mechanism is provided on one side of the frame. The weighed material falls into the packaging bag through the discharge pipe to form a material bag.

4. The vacuum packaging machine according to claim 3, characterized in that: A conveyor belt is also provided on one side of the frame, which supports the material bag and moves it to a work station unit.

5. The vacuum packaging machine according to claim 3, characterized in that: The front and rear sides of the discharging pipe are respectively equipped with a front bag clamping cylinder and a rear bag clamping cylinder, one end of the front bag clamping cylinder is hinged to the upper front part of the discharging pipe, and the middle part of the front side of the discharging pipe is hinged to a hinge point of a front clamping frame, and the other end of the front bag clamping cylinder is hinged to another hinge point of the front clamping frame. Another hinge point on the front clamping frame is hinged with a front pressing block, and the action of the rear bag clamping cylinder drives the rear clamping frame to rotate so that the front pressing block cooperates with the rear side of the lower part of the discharging pipe to clamp the rear of the packaging bag.

6. The vacuum packaging machine according to claim 1, characterized in that: The frame is also equipped with a material receiving platform connected to the material receiving trough. The two sides of one end of the material receiving platform are pivotally connected to the frame. The two sides of the middle of the material receiving platform are respectively hinged to one end of a pull rod with adjustable length, and the other end of the pull rod is hinged to the frame. The material receiving platform receives the material bags dropped from the material receiving trough.

7. The vacuum packaging machine according to claim 1, characterized in that: The piston rods of the two second clamping cylinders further extend from the other ends of the two second clamping cylinder housings and are jointly fixedly connected to a limit rod. One end of a screw is fixedly connected to a limit block. When the two second clamping cylinders are actuated and the second clamping block moves away from the base plate, the limit block presses against the limit rod to limit the travel of the piston rods of the two second clamping cylinders. A limit adjustment motor is also installed on the other side of the base plate. The limit adjustment motor drives the driving gear to rotate through the reducer. A nut is matched on the screw, and the nut is fixedly connected to a driven gear. The driving gear is meshed with the driven gear.

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