Multi-stage feeding open bag vacuum packaging production line

Abstract

The invention discloses a multi-stage feeding open bag vacuum packaging production line which comprises a vacuum suction packaging machine, a multi-stage variable speed feeding device, a cloth bag filter, a negative pressure fan, a power box and a main rack, the power box is installed on the back of the main rack, and the multi-stage variable speed feeding device is installed on a workbench on the top of the main rack. The vacuum suction packaging machine is arranged on one side of the main machine frame and comprises a vacuum packaging chamber and a weighing and bag clamping mechanism installed in the vacuum packaging chamber, a discharging port of the multi-stage feeding device is located in the vacuum packaging chamber, the negative pressure fan is arranged on the other side of the main machine frame, and the multi-stage feeding device is arranged on the other side of the main machine frame. The negative pressure fan is connected with the vacuum packaging chamber through a negative pressure pipeline, and a cloth bag filter is installed in the middle of the negative pressure pipeline. By means of the mode, the feeding requirements of different powder can be met, the air suction efficiency of a packaging bag can be improved, and the uniformity of the packaging quality is enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder packaging equipment, in particular to a multi-stage feeding open-bag vacuum packaging production line. BACKGROUND

[0002] Powder is a common raw material and product state in industrial production, and powder usually needs to be packaged uniformly by special equipment before transportation during the transportation process. The existing powder packaging production line usually fixes the packaging bag on the discharge port of the feeding device first, then transports the powder material from the stock bin to the discharge port position by a special feeding device for filling, and then sucks out the air in the packaging bag after filling and weighing to make the whole packaging bag compact. In this process, in order to prevent the powder in the bag from escaping due to the air suction action, some manufacturers install nanorods on the air suction valve to filter the powder. Although this method effectively reduces the escape of powder in actual application, on the one hand, the air holes of the nanorods are easily blocked with the increase of use time, resulting in reduced air suction efficiency. On the other hand, some small particles of nanometer size inevitably escape into the surrounding environment during actual use. Although this escape is not obvious, it still has a certain impact on the physical and mental health of the on-site personnel. In addition, the feeding speed of the existing feeding device is generally constant during the filling process, and the discharge port is urgently stopped at the end of filling. In order to ensure the quality of packaging, a large amount of excess material is usually left during the filling process, resulting in increased process loss for the manufacturer. SUMMARY

[0003] The technical problem solved by the present application is to provide a multi-stage feeding open-bag vacuum packaging production line, which can reduce the process loss in powder packaging, improve the packaging efficiency, and reduce the environmental impact.

[0004] To solve the above technical problems, one technical scheme of the present application is to provide a multi-stage feeding open-bag vacuum packaging production line, which comprises a vacuum air suction packaging machine, a multi-stage variable-speed feeding device, a cloth bag filter, a negative pressure fan, a power box and a main frame. The power box is installed behind the main frame, the multi-stage variable-speed feeding device is installed on the workbench at the top of the main frame, the vacuum air suction packaging machine is arranged on one side of the main frame, the vacuum air suction packaging machine comprises a vacuum packaging chamber and a weighing and bag clamping mechanism installed in the vacuum packaging chamber, the discharge port of the multi-stage feeding device is located in the vacuum packaging chamber, the negative pressure fan is arranged on the other side of the main frame, the negative pressure fan and the vacuum packaging chamber are connected by a negative pressure pipeline, and a cloth bag filter is installed in the middle of the negative pressure pipeline.

[0005] In a preferred embodiment of the present invention, the multi-stage variable speed feeding device includes: a hopper and a multi-stage screw feeder unit. The hopper is fixedly installed on the workbench at the top of the main frame. The multi-stage screw feeder unit consists of multiple horizontally arranged transverse screw feeders and a vertically arranged longitudinal screw feeder. Each transverse screw feeder includes a transverse feeding screw and a transverse drive motor. All transverse feeding screws are horizontally installed above the workbench. The corresponding transverse drive motors are fixed on motor bases below the workbench of the main frame. The power output end of each transverse drive motor is connected to the power input end of the corresponding transverse feeding screw. The multiple transmission paths are spatially staggered. The longitudinal screw feeder includes a longitudinal drive motor, a longitudinal feeding cylinder, and a longitudinal feeding screw. The longitudinal feeding cylinder is fixedly connected to the lower part of the hopper through horizontal connecting pipes corresponding to multiple transverse screw feeders. All transverse feeding screws pass horizontally through the hopper and are connected to the longitudinal feeding cylinder through corresponding horizontal connecting pipes. The longitudinal feeding screw rotates inside the longitudinal feeding cylinder. The longitudinal drive motor is fixed to the top of the longitudinal feeding cylinder and is connected to the power input end of the longitudinal feeding screw through a reducer. A discharge cutting mechanism is also installed on the longitudinal feeding cylinder.

[0006] The hopper is also equipped with an arch-breaking mechanism, which includes an arch-breaking head, an adapter, a transmission rod, and an auxiliary positioning bracket. The adapter is installed on the hopper wall, and a sealing ring is installed between the adapter and the hopper wall. The inner side of the adapter is connected to the arch-breaking head, and the outer side is connected to one end of the transmission rod. The other end of the transmission rod is rotatably mounted on the auxiliary positioning frame. A passive sprocket is installed on the shaft of the transmission rod. One of the multiple transverse screw feeders has a drive sprocket at its power input end that matches the transmission sprocket. The auxiliary positioning bracket includes a base and support columns. The base is fixed to the worktable on the top of the main frame. There are two support columns, symmetrically fixed on both sides of the base. The two support columns are connected by multiple reinforcing plates. A rotary bearing seat is installed on one of the reinforcing plates. The end of the transmission rod is inserted into the rotary bearing seat. A protective cover is also installed on the worktable on the top of the main frame. The protective cover is mounted on the auxiliary positioning bracket, and the support columns are all fixed to the inner wall of the protective cover on the corresponding side.

[0007] There are two transverse spiral feeders, which are arranged vertically and parallel to each other. They are an upper spiral feeder and a lower spiral feeder. The diameter of the feeding screw of the upper spiral feeder is smaller than that of the feeding screw of the lower spiral feeder. The power input ends of the upper spiral feeder and the lower spiral feeder are staggered and then connected to the power output ends of their respective drive motors.

[0008] The discharge cutting mechanism includes a telescopic cylinder, a cylinder seat, a lever seat, a transmission lever, a longitudinal push rod, a door bracket, and a cutting door. The cylinder seat is fixed to the top of the longitudinal feeding cylinder. The telescopic cylinder is installed on the cylinder seat. The lever seat is suspended in the middle of the cylinder seat. The transmission lever is rotatably installed on the lever seat. One end of the transmission lever is connected to the top of the telescopic rod of the telescopic cylinder, and the other end is connected to the top of the longitudinal push rod. The other end of the longitudinal push rod passes through the longitudinal feeding cylinder and is fixedly connected to the cutting door through the door bracket. The diameter of the cutting door matches the discharge port of the longitudinal feeding cylinder.

[0009] In a preferred embodiment of the present invention, the vacuum suction packaging machine further includes: a touch screen; the vacuum filling chamber is composed of a bag clamping chamber, the filling chamber being located at the top of the bag clamping chamber, the filling chamber and the bag clamping chamber together forming the vacuum packaging chamber; the vacuum packaging chamber has a return air port on the side near the main frame, there are two return air ports, namely an upper return air port and a lower return air port, the upper return air port is installed in the upper part of the filling chamber, the lower return air port is installed in the lower part of the bag clamping chamber, the touch screen is installed on the outside of the filling chamber, a sealed door is installed on the bag clamping chamber, and the weighing clamping mechanism... Installed inside the vacuum packaging chamber, this device can clamp the bag in the bag clamping chamber and then feed it into the filling chamber. A feed sleeve is located at the center of the top of the filling chamber, passing through the top plate of the chamber. A negative pressure interface is installed on the wall of the feed sleeve above the top plate, connected to a negative pressure fan via a negative pressure pipe. A longitudinal screw feeder is located at the outlet end of the multi-stage variable speed feeding device, passing through the feed sleeve into the vacuum packaging chamber. The outlet of the longitudinal screw feeder is positioned lower than that of the feed sleeve. The outlet has a sealing ring between the inlet of the feed sleeve and the longitudinal screw feeder; the weighing clamping mechanism includes a lifting cylinder, a guide rod, a weighing seat, a sleeve fixing frame, a loading sleeve, a bagging clamping arm, and a bag clamping cylinder. The lifting cylinder is installed in the bag clamping chamber. The top end of the guide rod is fixed to the top of the loading chamber, and the tail end extends vertically downward into the bag clamping chamber. The weighing seat is installed on the guide rod and hinged to the top end of the telescopic rod of the lifting cylinder, and can move up and down along the guide rod as the telescopic rod of the lifting cylinder moves. The diameter of the loading sleeve is larger than that of the feed sleeve. The diameter of the tube, the material bag clamping arms that match the shape of the tube body are symmetrically installed on both sides of the material bag clamping sleeve, and two synchronous clamping cylinders are symmetrically installed between the two material bag clamping arms. The two synchronous clamping cylinders are symmetrically arranged on the other two sides of the material bag clamping sleeve. The material bag clamping sleeve is connected to the weighing seat through the sleeve fixing frame. When the extension rod of the lifting cylinder extends, it can drive the material bag clamping sleeve to move vertically upward through the weighing seat and fit onto the feeding sleeve. When the extension rod of the lifting cylinder retracts, it can drive the material bag clamping sleeve to move vertically downward through the weighing seat and disengage from the feeding sleeve.

[0010] There are two sealed compartment doors: a front sealing door and a side sealing door. The front sealing door includes a front door frame, a front door panel, a front door hinge, a front door drive cylinder, and a front door push rod. The front door frame is located on the front of the bag-clamping chamber. A front door sealing gasket is encircled around the edge of the front door frame. The front door hinge is installed on the side of the front door frame away from the touchscreen. The shape of the front door panel matches the front door frame, and the front door panel is rotatably mounted on the front door frame via the front door hinge. Multiple front door drive cylinders are installed parallel to each other on the outer wall of the bag-clamping chamber on one side of the front door hinge. The front door push rod is L-shaped, and each front door drive cylinder has a telescopic rod. All components are movably connected to the front door panel via a front door push rod. The side sealing door includes a side door frame, a side door panel, a side door hinge, a side door drive cylinder, and a side door push rod. The side door frame is lower than the touchscreen. A side door sealing gasket is provided around the edge of the side door frame. A side door hinge is installed on the side of the side door frame near the main frame. The shape of the side door panel matches the side door frame. The side door panel is rotatably mounted on the side door frame via the side door hinge. There are multiple side door drive cylinders, which are installed in parallel on the main frame. The extension rod of each side door drive cylinder is movably connected to the front door panel via a side door push rod. An observation window is installed on the bag clamping chamber, and the observation window is located on the side away from the side sealing door.

[0011] The weighing seat is provided with two sets of parallel clamping wheels, which are simultaneously clamped on the guide rod. The weighing seat between the two sets of clamping wheels is provided with a hinge joint that is connected to the telescopic rod of the lifting cylinder. The weighing seat is provided with a connecting plate on its inner side, which is fixedly connected to the sleeve fixing frame.

[0012] In a preferred embodiment of the present invention, a vacuum tube interface is installed below the workbench of the main frame. There are two vacuum tube interfaces, namely a near-end interface and a far-end interface. The near-end interface is installed on the side of the main frame closer to the vacuum packaging chamber and is connected to the vacuum packaging chamber through a negative pressure pipe. The far-end interface is installed on the side of the main frame away from the vacuum packaging chamber. The near-end interface and the far-end interface are connected through a negative pressure pipe. The far-end interface is connected to a negative pressure fan externally through a negative pressure pipe.

[0013] The beneficial effects of this invention are as follows: By optimizing the overall structure of existing powder packaging equipment, this invention, on the one hand, sets up a vacuum packaging chamber at the packaging location. After the powder is filled and weighed, the air inside the packaging bag is sucked away by the overall negative pressure suction method. Then, the dust escaping from the vacuum packaging chamber is sucked away by the return air port. Throughout the process, the suction efficiency is significantly enhanced compared to nanorod suction, and it does not deteriorate with working time. Moreover, there is no dust overflow during the bagging process, which has almost no impact on the surrounding environment and is more conducive to the physical and mental health of on-site personnel. On the other hand, the feeding device is optimized into multi-stage feeding. In actual production, not only can different feeding screws with different speeds be matched according to the flow characteristics of different powders to maximize the feeding efficiency during the process, but also, when approaching the end point, the feeding speed in the final stage can be precisely controlled by closing the excess screws, improving feeding accuracy and ensuring the stability of the final filling stage, thereby improving the uniformity of product packaging, reducing the process losses of the manufacturer, and achieving a balance between packaging efficiency and uniformity. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the feeding module structure in the illustrated embodiment; Figure 3 This is a schematic diagram of the arch-breaking mechanism in the graded feeding device shown. Figure 4 This is a schematic diagram of the cutting mechanism structure in the feeding module shown. Figure 5 This is a schematic diagram of the structure of the negative pressure loading chamber before loading in the illustrated embodiment; Figure 6 This is a schematic diagram of the clamping mechanism during material loading in the negative pressure loading chamber of the illustrated embodiment; Figure 7 This is a schematic diagram of the driving action of the clamping and weighing mechanism in the negative pressure loading chamber shown. Figure 8 This is a side view of the negative pressure loading chamber. Figure 9 This is a schematic diagram of the opening and closing action of the two side doors of the negative pressure loading chamber shown. The components in the attached diagram are labeled as follows: 1. Operator; 2. Multi-stage variable speed feeding device; 3. Vacuum packaging chamber; 4. Weighing and bag clamping mechanism; 5. Main frame; 6. Bag filter; 7. Negative pressure fan; 8. Power box; 201. Hopper; 202. Protective cover; 203. Arch breaking mechanism; 20301. Arch breaking head 20; 302. Adapter; 20303. Sealing ring; 20304. Transmission rod; 20305. Driven sprocket; 20306. Rotary bearing seat; 20307. Reinforcing plate; 20308. Support column; 20309. Base; 204. Upper transverse feeding screw; 205. Lower transverse feeding screw; 206. Longitudinal feeding screw; 207. 20701. Loading and cutting mechanism; 20702. Telescopic cylinder; 20703. Cylinder seat; 20704. Lever seat; 20705. Transmission lever; 20706. Longitudinal push rod; 20707. Door support; 20707. Cut-off door; 208. Upper drive motor; 209. Lower drive motor; 2010. Longitudinal drive motor; 2011. Upper horizontal connecting pipe; 2012. Lower horizontal connecting pipe; 2013. Longitudinal feeding cylinder; 2014. Main frame; 301. Touch screen; 302. Loading chamber; 303. Bag clamping chamber; 304. Front door panel; 305. Side door panel; 306. Front door hinge; 307. Side door hinge; 308. Front door drive cylinder; 309. Side door drive cylinder; 3010. Front door push rod; 3011. Side door push rod; 3012. Front door sealing gasket; 3013. Side door sealing gasket; 3014. Feed sleeve; 3015. Negative pressure interface; 3016. Upper air return port; 3017. Lower air return port; 3018. Observation window; 401. Guide rod; 402. Lifting cylinder; 403. Clamping wheel assembly; 404. Hinge joint; 405. Connecting plate; 406. Sleeve fixing frame; 407. Loading sleeve; 408. Synchronous clamping cylinder; 409. Bag clamping arm; 501. Workbench, 502. Motor mount, 503. Near-end interface, 504. Far-end interface. Detailed Implementation

[0015] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0016] Please see Figures 1 to 9 The embodiments of the present invention include: A multi-stage feeding open-bag vacuum packaging production line includes: a vacuum suction packaging machine, a multi-stage variable speed feeding device 2, a bag filter 6, a negative pressure fan 7, a power box 8, and a main frame 5. The power box 8 is installed behind the main frame 5. The multi-stage variable speed feeding device 2 is installed on a worktable at the top of the main frame. The vacuum suction packaging machine is located on one side of the main frame and includes a vacuum packaging chamber 3 and a weighing and bag clamping mechanism 4 installed in the vacuum packaging chamber 3. The outlet of the multi-stage feeding device 2 is located inside the vacuum packaging chamber 3. The negative pressure fan 7 is located on the other side of the main frame 5. Vacuum tube interfaces are installed below the workbench surface of the main frame 5. There are two vacuum tube interfaces: a near-end interface 503 and a far-end interface 504. The near-end interface 503 is installed on the side of the main frame 5 closest to the vacuum packaging chamber 3 and is connected to the vacuum packaging chamber 3 via a negative pressure pipe. The far-end interface 504 is installed on the side of the main frame 5 furthest from the vacuum packaging chamber 3. The near-end interface 503 and the far-end interface 504 are connected by a negative pressure pipe. The far-end interface 504 is connected to a negative pressure fan 7 via a negative pressure pipe. A bag filter 7 is installed in the middle of the negative pressure pipe between the far-end interface 504 and the negative pressure fan 7. In this way, the vacuum packaging chamber 3 and the vacuum equipment such as the negative pressure fan 7 can be arranged on both sides of the main frame 5, which is convenient for production line layout. Moreover, the bag filter 6 in the middle can effectively intercept the dust extracted from the vacuum packaging chamber 3 during the negative pressure suction process and prevent it from entering the surrounding environment.

[0017] The multi-stage variable speed feeding device 2 includes a hopper 201 and a multi-stage screw feeder unit, both of which are mounted on the main frame 5. The hopper 201 is fixedly mounted on a workbench 501 at the top of the main frame 5. The multi-stage screw feeder unit consists of two horizontally arranged transverse screw feeders and one vertically arranged longitudinal screw feeder. The two transverse screw feeders are arranged parallel to each other above the workbench 501, and are respectively an upper screw feeder and a lower screw feeder. The upper screw feeder includes an upper transverse feeding screw 204 and an upper transverse drive motor 208. The lower screw feeder includes a lower transverse feeding screw 205 and a lower transverse drive motor 209. The diameter of the upper transverse feeding screw 204 is smaller than that of the lower transverse feeding screw 205, generally half the diameter of the lower transverse feeding screw 205. This allows for more speed combinations to accommodate various powders, and the loading speed can be reduced in the final stage as needed to improve packaging quality consistency and reduce waste. Both the upper transverse drive motor 208 and the lower transverse drive motor 209 are fixed on motor bases 502 located below the workbench 502 of the main frame 5. The power output end of the machine 208 and the power input end of the upper transverse feeding screw 204, and the power output end of the lower transverse drive motor 209 and the power input end of the lower transverse feeding screw 205 are all equipped with pulleys. The pulleys are connected by belt drive and their transmission paths are spatially offset from each other. The longitudinal screw feeder includes a longitudinal drive motor 2010, a longitudinal feeding cylinder 2013, and a longitudinal feeding screw 206. The longitudinal feeding cylinder 2013 and the lower part of the hopper 201 are connected by upper horizontal connecting pipes 201 corresponding to the upper and lower transverse screw feeders, respectively. 1. The upper horizontal feeding screw 204 and the lower horizontal feeding screw 205 are fixedly connected to the lower horizontal connecting pipe 2012. The upper horizontal feeding screw 204 and the lower horizontal feeding screw 205 pass horizontally through the hopper 201 and are respectively connected to the longitudinal feeding cylinder 2013 through the upper horizontal connecting pipe 2011 and the lower horizontal connecting pipe 2012. The longitudinal feeding screw 206 is installed in the longitudinal feeding cylinder 2013. The longitudinal drive motor 2010 is fixed to the top of the longitudinal feeding cylinder 2013 and is connected to the power input end of the longitudinal feeding screw 206 through a reducer. The longitudinal feeding cylinder 2013 is also equipped with a discharge cutting mechanism.

[0018] The hopper 201 is also equipped with an arch-breaking mechanism, which includes an arch-breaking head 20301, an adapter 20302, a transmission rod 20304, and an auxiliary positioning bracket. The adapter 20302 is installed on the hopper wall of the hopper 201, and a sealing ring 20303 is installed between the adapter 20302 and the hopper wall of the hopper 201. The inner side of the adapter 20302 is connected to the arch-breaking head 20301, and the outer side is connected to one end of the transmission rod 20304. The other end of the transmission rod 20304 is rotatably mounted on the auxiliary positioning bracket. A passive sprocket 20305 is installed on the shaft of the transmission rod 20304, and the power input end of the upper screw feeder is provided with an active sprocket that matches the passive sprocket 20305. When the upper screw feeder operates, it drives the transmission rod 20304 to rotate, and the rotation is transmitted to the anti-bridging head 20301 in the hopper 201 through the adapter 20302, causing the anti-bridging head 20301 to rotate as a whole, thereby effectively preventing the powder from failing to feed due to local voids during the conveying process. The auxiliary positioning bracket includes a base 20309 and support columns 20308. The base 20309 is fixed on the workbench 501 on the top of the main frame 205. There are two support columns 20308, which are symmetrically fixed on both sides of the base 20309. The two support columns 20308 are connected by multiple reinforcing plates 20307. The base 20309, support columns 20308 and reinforcing plates 20307 are all made of angle steel welded together. A rotary bearing seat 20306 is installed on one of the reinforcing plates 20307, ​​and the end of the transmission rod 20304 is inserted into the rotary bearing seat 20306. A protective cover plate 202 is also installed on the workbench 501 at the top of the main frame 5. The protective cover plate 202 is installed based on the auxiliary positioning bracket, and the support columns 20308 are all fixed to the inner wall of the protective cover plate 202 on the corresponding side. The purpose of setting up the auxiliary positioning bracket is, on the one hand, to serve as a support frame for the installation of the protective cover plate 202, and on the other hand, to support the transmission rod 20304, so as to facilitate the overall rotation of the arch-breaking mechanism. Moreover, the protective cover plate 202 can prevent accidental collisions from affecting the transmission path between the drive motor and the corresponding transverse feeding screw.

[0019] The discharge cutting mechanism includes a telescopic cylinder 20701, a cylinder seat 20702, a lever seat 20703, a transmission lever 20704, a longitudinal push rod 20705, a door bracket 20706, and a cutting door 20707. The cylinder seat 20702 is fixed to the top of the longitudinal feeding cylinder 2013. The telescopic cylinder 20701 is mounted on the cylinder seat 20702. The lever seat 20703 is suspended in the middle of the cylinder seat 20702. The transmission lever 20704 is rotatably mounted on the lever seat 20703. One end of the movable lever 20704 is connected to the top of the telescopic rod of the telescopic cylinder 20701, and the other end is connected to the top of the longitudinal push rod 20705. The other end of the longitudinal push rod 20705 passes through the longitudinal feeding cylinder 2013 and is fixed to the cut-off door 20707 by the door bracket 20706. The diameter of the cut-off door 20707 matches the discharge port diameter of the longitudinal feeding cylinder 2013, and can move vertically up and down with the extension and retraction of the telescopic rod of the telescopic cylinder 20701 to complete the opening and closing action of the discharge port of the longitudinal screw feeder.

[0020] The open-bag vacuum packaging machine also includes a touch screen 301. The vacuum filling chamber consists of a filling chamber 302 and a bag clamping chamber 303. The filling chamber 302 is located at the top of the bag clamping chamber 301. The weighing clamping mechanism 4 is installed inside the vacuum packaging chamber 3 and can send the bag into the filling chamber 302 after clamping the bag in the bag clamping chamber 303. The vacuum packaging chamber 3 has a return air port on the side near the main frame 5. There are two return air ports, namely an upper return air port 3016 and a lower return air port 3017. The upper return air port 3016 is installed at the top of the filling chamber 302, and the lower return air port 3017 is installed at the bottom of the bag clamping chamber 303. By setting two return air ports, air can be pre-returned before opening the sealed chamber door after packaging, reducing the pressure difference between the inside and outside and reducing the resistance to opening the door. The touch screen 301 is installed on the outside of the filling chamber 302, the bag clamping chamber 303 is equipped with a sealed door, and the weighing clamping mechanism 4 is installed inside the vacuum packaging chamber 3, which can send the bag into the filling chamber 302 after clamping the bag in the bag clamping chamber 303. A feeding sleeve 3014 is provided at the center of the top of the loading chamber 302. The feeding sleeve 3014 passes through the top plate of the loading chamber 302 and enters the loading chamber 302. A negative pressure interface 3015 is installed on the pipe wall of the portion of the feeding sleeve 3014 above the top plate. The negative pressure interface 3015 is connected to the near-end interface 503 on the main frame 5 through a negative pressure pipe. The longitudinal screw feeder at the discharge end of the multi-stage variable speed feeding device 2 passes through the feeding sleeve 3014 and enters the vacuum packaging chamber 3. The discharge port of the longitudinal screw feeder is lower than the outlet of the feeding sleeve 3014. A sealing ring is provided between the inlet of the feeding sleeve 3014 and the longitudinal feeding cylinder 2013 of the longitudinal screw feeder. The weighing clamping mechanism 4 The device includes a lifting cylinder 402, a guide rod 401, a weighing seat, a sleeve fixing frame 406, a loading sleeve 407, a bag-filling clamping arm 409, and a bag-clamping cylinder 408. The lifting cylinder 402 is installed inside the bag-clamping chamber 303. The top end of the guide rod 401 is fixed to the top of the loading chamber 302, and the tail end extends vertically downward into the bag-clamping chamber 303. The weighing seat is installed on the guide rod 401. The weighing seat is provided with two sets of parallel clamping wheel sets 403, which are simultaneously clamped on the guide rod 401. The weighing seat between the two sets of clamping wheel sets 403 is provided with a hinge joint 404 that is connected to the telescopic rod of the lifting cylinder 402. The inner side of the weighing seat is provided with a connecting plate 405, which is fixedly connected to the sleeve fixing frame 406. The diameter of the filling sleeve 407 is larger than that of the feeding sleeve 3014. Material bag clamping arms 409, matching the shape of the sleeve body, are symmetrically installed on both sides of the filling sleeve 407. Two synchronous clamping cylinders 408 are symmetrically installed between the two material bag clamping arms 407. The two synchronous clamping cylinders 408 are symmetrically arranged on the other two sides of the filling sleeve 407. The filling sleeve 407 is connected to the weighing base via a sleeve fixing bracket 406. When the extension rod of the lifting cylinder 402 extends, it can drive the filling sleeve 407 to move vertically upwards and onto the feeding sleeve 3014 via the weighing base. When the extension rod of the lifting cylinder 401 retracts, it can drive the filling sleeve 407 to move vertically downwards and disengage from the feeding sleeve 3014 via the weighing base. This structure ensures the stability of the reciprocating motion of the weighing base during packaging, thereby guaranteeing the accuracy of the weighing data during filling.

[0021] There are two sealed compartment doors: a front sealing door and a side sealing door. The front sealing door includes a front door frame, a front door panel 304, a front door hinge 306, a front door drive cylinder 308, and a front door push rod 3010. The front door frame is located on the front of the bag-clamping chamber 303. A front door sealing gasket 3012 is encircled around the edge of the front door frame. The front door hinge 306 is installed on the side of the front door frame away from the touchscreen 301. The shape of the front door panel 304 matches the front door frame, and the front door panel 304 is rotatably mounted on the front door frame via the front door hinge 306. There are two front door drive cylinders 308, symmetrically and parallelly mounted on the outer wall of the bag-clamping chamber 303 on one side of the front door hinge 306. The front door push rod 3010 is L-shaped, and the extension rod of each front door drive cylinder 308... The front door panel 304 is movably connected to the front door panel 304 via a front door push rod 3010; the side sealing door includes a side door frame, a side door panel 305, a side door hinge 307, a side door drive cylinder 309, and a side door push rod 3011. The side door frame is lower than the touch screen 301. A side door sealing gasket 3013 is provided around the edge of the side door frame. The side door hinge 307 is installed on the side of the side door frame near the main frame 5. The shape of the side door panel 305 matches the side door frame. The side door panel 305 is rotatably mounted on the side door frame via the side door hinge 307. There are two side door drive cylinders 309, which are symmetrically and parallelly mounted on the main frame 5. The telescopic rod of each side door drive cylinder 309 is movably connected to the front door panel 304 via a side door push rod 3011. By setting two sealed compartment doors, the bag clamping action and the bag removal action after the filling is completed can be performed from two different directions, which effectively avoids the action interference when operating from only one direction, improves the smoothness of the production line operation, and facilitates the automation design of the overall production line.

[0022] An observation window 3018 is installed on the wall of the bag-clamping chamber 303, and the observation window 3018 is located on the side away from the side sealing door. Through the observation window, on-site inspectors can observe the packaging status inside the vacuum packaging chamber 3 at any time.

[0023] In practical use, the rotational speed ratio of the two transverse spiral feeders of the multi-stage variable speed feeding device 2 is first determined according to the type and flowability of the powder. Then, on-site personnel 1 put the material bag onto the filling sleeve 407. Next, the vacuum packaging chamber 3 is closed, the telescopic rod of the lifting cylinder 402 extends, and pushes the weighing seat as a whole to rise along the guide rod 401 to the preset height. At this time, the filling sleeve 407 completely covers the feed sleeve 3014, and then the cut-off door 20707 opens to start filling the powder. During the filling process, the telescopic rod continuously retracts, causing the bag and the filling sleeve 407 to descend to the starting position and be weighed. Near the end of the weighing process, the multi-stage variable speed feeding device 2 shuts off the lower transverse spiral feeder, reducing the feeding speed and improving the stability of the feeding process. This ensures that the final weighing result is accurately consistent with the preset requirements. After weighing, both return air ports open simultaneously, using air convection to suck away the dust in the vacuum packaging chamber 3 under negative pressure. Finally, the sealed door opens, and the on-site personnel 1 removes the bag. During the filling process, on-site personnel 1 can also observe the filling status through the observation window 3018 to prevent malfunctions. The entire bagging operation is carried out under negative pressure in the vacuum packaging chamber 3, allowing excess dust to be promptly sucked away through return air. Compared to traditional nano-valve suction packaging equipment, this method not only has higher suction efficiency but also eliminates any dust spillage, having almost no impact on the surrounding environment and being more beneficial to the physical and mental health of on-site personnel.

[0024] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A multi-stage feeding open-bag vacuum packaging production line, characterized in that, The multi-stage feeding open-bag vacuum packaging production line includes: a vacuum suction packaging machine, a multi-stage variable speed feeding device, a bag filter, a negative pressure fan, a power box, and a main frame. The power box is installed behind the main frame, and the multi-stage variable speed feeding device is installed on the worktable at the top of the main frame. The vacuum suction packaging machine is located on one side of the main frame and includes a vacuum packaging chamber and a weighing and bag clamping mechanism installed inside the vacuum packaging chamber. The discharge port of the multi-stage feeding device is located inside the vacuum packaging chamber, and the negative pressure fan is located on the other side of the main frame. The negative pressure fan and the vacuum packaging chamber are connected by a negative pressure pipe, and a bag filter is installed in the middle of the negative pressure pipe.

2. The multi-stage feeding open-bag vacuum packaging production line according to claim 1, characterized in that, The multi-stage variable speed feeding device includes a hopper and a multi-stage screw feeder unit. The hopper is fixedly installed on the workbench on the top of the main frame. The multi-stage screw feeder unit consists of multiple horizontally arranged transverse screw feeders and a vertically arranged longitudinal screw feeder. Each transverse screw feeder includes a transverse feeding screw and a transverse drive motor. All transverse feeding screws are horizontally installed above the workbench. The corresponding transverse drive motors are fixed on motor bases below the workbench of the main frame. The power output end of each transverse drive motor is connected to the power input end of the corresponding transverse feeding screw. The multiple transmission paths are spatially staggered. The longitudinal screw feeder includes a longitudinal drive motor, a longitudinal feeding cylinder, and a longitudinal feeding screw. The longitudinal feeding cylinder is fixedly connected to the lower part of the hopper through horizontal connecting pipes corresponding to multiple transverse screw feeders. All transverse feeding screws pass horizontally through the hopper and are connected to the longitudinal feeding cylinder through corresponding horizontal connecting pipes. The longitudinal feeding screw rotates inside the longitudinal feeding cylinder. The longitudinal drive motor is fixed to the top of the longitudinal feeding cylinder and is connected to the power input end of the longitudinal feeding screw through a reducer. A discharge cutting mechanism is also installed on the longitudinal feeding cylinder.

3. The multi-stage feeding open-bag vacuum packaging production line according to claim 2, characterized in that, The hopper is also equipped with an arch-breaking mechanism, which includes an arch-breaking head, an adapter, a transmission rod, and an auxiliary positioning bracket. The adapter is installed on the hopper wall, and a sealing ring is installed between the adapter and the hopper wall. The inner side of the adapter is connected to the arch-breaking head, and the outer side is connected to one end of the transmission rod. The other end of the transmission rod is rotatably mounted on the auxiliary positioning frame. A passive sprocket is installed on the shaft of the transmission rod. One of the multiple transverse screw feeders has a drive sprocket at its power input end that matches the transmission sprocket. The auxiliary positioning bracket includes a base and support columns. The base is fixed to the worktable on the top of the main frame. There are two support columns, symmetrically fixed on both sides of the base. The two support columns are connected by multiple reinforcing plates. A rotary bearing seat is installed on one of the reinforcing plates. The end of the transmission rod is inserted into the rotary bearing seat. A protective cover is also installed on the worktable on the top of the main frame. The protective cover is mounted on the auxiliary positioning bracket, and the support columns are all fixed to the inner wall of the protective cover on the corresponding side.

4. The multi-stage feeding open-bag vacuum packaging production line according to claim 2, characterized in that, There are two transverse spiral feeders, which are arranged vertically and parallel to each other. They are an upper spiral feeder and a lower spiral feeder. The diameter of the feeding screw of the upper spiral feeder is smaller than that of the feeding screw of the lower spiral feeder. The power input ends of the upper spiral feeder and the lower spiral feeder are staggered and then connected to the power output ends of their respective drive motors.

5. The multi-stage feeding open-bag vacuum packaging production line according to claim 2, characterized in that, The discharge cutting mechanism includes a telescopic cylinder, a cylinder seat, a lever seat, a transmission lever, a longitudinal push rod, a door bracket, and a cutting door. The cylinder seat is fixed to the top of the longitudinal feeding cylinder. The telescopic cylinder is installed on the cylinder seat. The lever seat is suspended in the middle of the cylinder seat. The transmission lever is rotatably installed on the lever seat. One end of the transmission lever is connected to the top of the telescopic rod of the telescopic cylinder, and the other end is connected to the top of the longitudinal push rod. The other end of the longitudinal push rod passes through the longitudinal feeding cylinder and is fixedly connected to the cutting door through the door bracket. The diameter of the cutting door matches the discharge port of the longitudinal feeding cylinder.

6. The multi-stage feeding open-bag vacuum packaging production line according to claim 1, characterized in that, The vacuum suction packaging machine further includes: a touch screen; the vacuum filling chamber is composed of a bag clamping chamber; the filling chamber is located at the top of the bag clamping chamber; the filling chamber and the bag clamping chamber together constitute the vacuum packaging chamber; the vacuum packaging chamber has a return air port on the side near the main frame; there are two return air ports, namely an upper return air port and a lower return air port; the upper return air port is installed in the upper part of the filling chamber; the lower return air port is installed in the lower part of the bag clamping chamber; the touch screen is installed on the outside of the filling chamber; a sealed door is installed on the bag clamping chamber; and the weighing clamping mechanism is installed in the vacuum packaging chamber, which can send the bag into the filling chamber after clamping the bag in the bag clamping chamber. A feeding sleeve is provided at the center of the top of the loading chamber. The feeding sleeve passes through the top plate of the loading chamber and enters the loading chamber. A negative pressure interface is installed on the pipe wall of the portion of the feeding sleeve above the top plate. The negative pressure interface is connected to a negative pressure fan through a negative pressure pipe. A longitudinal screw feeder is provided at the discharge end of the multi-stage variable speed feeding device. The longitudinal screw feeder passes through the feeding sleeve and enters the vacuum packaging chamber. The discharge port of the longitudinal screw feeder is lower than the outlet of the feeding sleeve. A sealing ring is provided between the inlet of the feeding sleeve and the longitudinal screw feeder. The weighing and clamping mechanism includes a lifting cylinder, a guide rod, a weighing seat, a sleeve fixing frame, a filling sleeve, a bagging arm, and a bag clamping cylinder. The lifting cylinder is installed in the bag clamping chamber. The top end of the guide rod is fixed to the top of the filling chamber, and the tail end extends vertically downward into the bag clamping chamber. The weighing seat is installed on the guide rod and hinged to the top end of the telescopic rod of the lifting cylinder, allowing it to reciprocate up and down along the guide rod as the telescopic rod of the lifting cylinder moves. The diameter of the filling sleeve is larger than the diameter of the feed sleeve, and the two sides of the filling sleeve are symmetrical. Install bag clamping arms that match the shape of the filling sleeve. Two synchronous clamping cylinders are symmetrically installed between the two bag clamping arms. The two synchronous clamping cylinders are symmetrically arranged on the other two sides of the filling sleeve. The filling sleeve is connected to the weighing base through a sleeve fixing frame. When the extension rod of the lifting cylinder extends, it can drive the filling sleeve to move vertically upward through the weighing base and fit onto the feeding sleeve. When the extension rod of the lifting cylinder retracts, it can drive the filling sleeve to move vertically downward through the weighing base and disengage from the feeding sleeve.

7. The multi-stage feeding open-bag vacuum packaging production line according to claim 6, characterized in that, There are two sealed compartment doors: a front sealed door and a side sealed door. The front sealed door includes a front door frame, a front door panel, a front door hinge, a front door drive cylinder, and a front door push rod. The front door frame is located on the front of the bag clamping chamber. A front door sealing gasket is installed around the edge of the front door frame. The front door hinge is installed on the side of the front door frame away from the touch screen. The shape of the front door panel matches the front door frame. The front door panel is rotatably mounted on the front door frame via the front door hinge. There are multiple front door drive cylinders, which are installed in parallel on the outer wall of the bag clamping chamber on one side of the front door hinge. The front door push rod is L-shaped, and the extension rod of each front door drive cylinder is movably connected to the front door panel via a front door push rod. The side-sealed door includes a side door frame, a side door panel, a side door hinge, a side door drive cylinder, and a side door push rod. The side door frame is lower than the touch screen. A side door sealing gasket is provided around the edge of the side door frame. A side door hinge is installed on the side of the side door frame near the main frame. The shape of the side door panel matches the side door frame. The side door panel is rotatably mounted on the side door frame via the side door hinge. There are multiple side door drive cylinders, which are installed in parallel on the main frame. The extension rod of each side door drive cylinder is movably connected to the front door panel via a side door push rod.

8. The multi-stage feeding open-bag vacuum packaging production line according to claim 6, characterized in that, An observation window is installed on the bag clamping chamber, and the observation window is located on the side away from the side sealing door.

9. The multi-stage feeding open-bag vacuum packaging production line according to claim 6, characterized in that, The weighing seat is provided with two sets of parallel clamping wheels, which are simultaneously clamped on the guide rod. The weighing seat between the two sets of clamping wheels is provided with a hinge joint that is connected to the telescopic rod of the lifting cylinder. The weighing seat is provided with a connecting plate on its inner side, which is fixedly connected to the sleeve fixing frame.

10. The multi-stage feeding open-bag vacuum packaging production line according to claim 1, wherein a vacuum tube interface is installed below the workbench of the main frame, and there are two vacuum tube interfaces, namely a near-end interface and a far-end interface. The near-end interface is installed on the side of the main frame close to the vacuum packaging chamber and is connected to the vacuum packaging chamber through a negative pressure pipe. The far-end interface is installed on the side of the main frame away from the vacuum packaging chamber. The near-end interface and the far-end interface are connected through a negative pressure pipe. The far-end interface is connected to a negative pressure fan through a negative pressure pipe.

Images