Bag feeding type packaging machine and gas replacement device thereof

Abstract

The invention discloses a bag feeding type packaging machine and a gas replacement device thereof, and relates to the field of packaging machines, the bag feeding type packaging machine comprises a rotating platform, a heat sealing assembly, a plurality of groups of clamping mechanisms mounted below the rotating platform, and insertion pipes which pass through the clamping mechanisms up and down and are used for gas replacement, the heat sealing assembly is arranged below the clamping mechanism and rotates along with the clamping mechanism or is independently arranged on the rotating track path of the clamping mechanism, and the inserting pipe has the first action of being inserted into a packaging bag to conduct gas replacement. The second action is that the packaging bag is partially pulled away, and the heat sealing assembly conducts primary heat sealing on the packaging bag; and the third action is that the packaging bag is completely pulled away from the packaging bag. The method has the advantages that the product percent of pass is improved, and the packaging effect is good.

Description

Technical Field

[0001] This invention relates to the field of packaging machines, and more specifically to a bag-type packaging machine and its gas replacement device. Background Technology

[0002] In the prior art, the gas replacement device of a packaging machine, such as the bag clamping mechanism of the gas replacement device disclosed in CN217779116U on 2022-11-11, has a tube for gas replacement inserted into the middle of the clamping hand. It rotates together with the turntable of the bag feeder and passes sequentially through the bag feeding device, barcode scanning device, bag opening device, feeding device, heat sealing device, and shaping output device arranged around the turntable. Only one heat sealing process is performed. During the process from the tube being pulled out to the heat sealing, there may be gas leakage or the introduction of impurity gas, which affects the packaging quality. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a bag packaging machine and its gas replacement device that improves product qualification rate and packaging effect.

[0004] The technical solution adopted in this invention is as follows: a gas replacement device for a bag packaging machine, which includes a rotating platform, a heat sealing assembly, several sets of clamping mechanisms installed below the rotating platform, and an insertion tube that moves up and down through the clamping mechanisms for gas replacement. The heat sealing assembly is located below the clamping mechanisms and rotates with the clamping mechanisms or is independently located on the rotation trajectory path of the clamping mechanisms. The insertion tube has a first action of inserting into the packaging bag for gas replacement, a second action of partially removing from the packaging bag to allow the heat sealing assembly to perform preliminary heat sealing on the packaging bag, and a third action of completely removing from the packaging bag.

[0005] The clamping mechanism includes a vertically arranged clamping drive, two oppositely arranged bag clamping plates, and a linkage component connected to the output end of the clamping drive and driving the bag clamping plates to move towards and away from each other.

[0006] The rotating platform is provided with several horizontally mounted central shafts along the circumference, and the central shafts have slots in the middle to avoid the insertion of tubes; the linkage assembly includes:

[0007] A movable block is installed at the output end of the clamping drive; Two bag clamping seats are arranged opposite to each other and are rotatably mounted on the central shaft; Several connecting rods, each having its two ends hinged to the movable block and the bag clamp seat respectively; The bag clamping plate is fixedly installed on the inner side of each bag clamping seat.

[0008] The clamping plate has a notch for the insertion tube to pass through; The inner side of the bag clamp is fitted with a soft pad.

[0009] Several sets of clamping mechanisms are evenly distributed on the lower surface of the rotating platform, and a connecting shaft is provided between the bag clamping seat and the connecting rod to connect the two. The heat sealing assembly includes two first heat sealing plates arranged opposite each other and located below the bag clamping plate, and a connecting frame is provided between the first heat sealing plates and the connecting shaft to fix the two together.

[0010] The heat-sealing assembly further includes: A spring seat is installed on the outer side of one end of each bag clamping plate and is equipped with a guide shaft and a spring. A swing arm, one end of which is rotatably connected to the guide shaft and the other end of which is fixedly connected to the connecting shaft; The spring is mounted on the guide shaft, and both ends of the spring abut against the spring seat and the guide shaft respectively; a roller is installed at the outer end of the swing arm; The lifting pressure block is independently set and located above the rotation trajectory of the roller.

[0011] The heat-sealing assembly includes: The bracket is located on the path of the rotation trajectory of the clamping mechanism; A heat-sealing drive component, which is mounted on the bracket; The second heat-sealing plate is connected to the output end of the heat-sealing drive component; The lower part of the bag clamping plate extends from the corresponding extension of the second heat-sealing plate.

[0012] An adjustment component for adjusting the left-right balance of the second heat-sealing plate is provided between the output end of the heat-sealing drive and the second heat-sealing plate. The adjustment component includes: A connector base, which is fixedly connected to the output end of the heat-sealing drive component; An adjusting plate is mounted on the side wall of the connector seat; The second heat-sealing plate has a rearwardly extending mounting block on its rear side, the adjusting plate has a mounting groove for the mounting block to be inserted, and the adjusting plate has a positioning pin that is vertically rotatably mounted and cooperates with the mounting block.

[0013] The rotating platform is provided with a first driving component that drives the insertion tube to move up and down. The output end of the first driving component is provided with a connecting plate that is connected to the insertion tube assembly. The rotating platform is also provided with a second driving component. The output end of the second driving component is provided with a pressure plate that presses down the connecting plate.

[0014] The rotating platform includes a main shaft, a second rotating plate fixedly connected to the main shaft and for mounting a clamping mechanism, and a first rotating plate for mounting a tube. The first rotating plate has a first gear that rotates and engages with it at its center, and a third driving component that drives the first gear to rotate. The inner circumferential surface of the first gear is threadedly engaged with the outer circumferential surface of the main shaft. A mounting seat is fixedly connected below the first gear, and a bearing is provided between the inner ring of the first rotating plate and the mounting seat.

[0015] The present invention also provides another technical solution, a bag-type packaging machine, including a turntable device and a bag-feeding device, a barcode scanning device, a bag-opening device, a feeding device, a heat-sealing device, and a shaping and output device arranged around the turntable device, characterized in that: a gas replacement device as described above for the bag-type packaging machine is provided between the feeding device and the heat-sealing device.

[0016] The beneficial effects of this invention are: by separating the gas replacement device from the bag feeder, and configuring a rotating platform, clamping mechanism and heat sealing components on the gas replacement device, it is possible to clamp the packaging bag that has been fed, and to perform gas replacement and preheat sealing processes during the rotation process, which greatly ensures the gas replacement effect and improves the product qualification rate and packaging effect. In addition, setting the insertion tube to be removed from the packaging bag in stages, first raising the insertion tube an appropriate distance to allow the heat sealing component to preheat and seal the packaging bag, and then completely removing the insertion tube from the packaging bag, can prevent gas leakage or the introduction of impurity gases, and has the advantage of improving the gas replacement effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the gas replacement device of the packaging machine according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the bottom structure of the gas replacement device of the packaging machine in Embodiment 1.

[0019] Figure 3 This is a schematic diagram of the clamping mechanism in Embodiment 1.

[0020] Figure 4 This is a schematic diagram of the clamping mechanism in Embodiment 2.

[0021] Figure 5 for Figure 2 A magnified view of a portion of point A in the middle.

[0022] Figure 6 This is a schematic diagram of the clamping mechanism and insertion tube in Embodiment 2.

[0023] Figure 7 This is a partial structural diagram of the clamping mechanism.

[0024] Figure 8 This is a schematic diagram of the bottom structure of the gas replacement device of the packaging machine in Embodiment 2.

[0025] Figure 9 This is a cross-sectional view of the gas replacement device of the packaging machine.

[0026] Figure 10 for Figure 8 A magnified view of a section at point B in the middle.

[0027] Figure 11 This is a schematic diagram of the heat-sealing assembly in Example 2.

[0028] Figure 12 This is a cross-sectional view of the heat-sealing assembly in Example 2.

[0029] Figure 13 This is a structural diagram of a bag packaging machine. Detailed Implementation

[0030] The embodiments of the present invention will be further described below with reference to the accompanying drawings: As shown in the figure, a gas replacement device for a bag-feeding packaging machine includes a rotating platform 1, a heat-sealing assembly 2, several sets of clamping mechanisms 3 installed below the rotating platform 1, and an insertion tube 4 that moves up and down through the clamping mechanisms 3 for gas replacement. The heat-sealing assembly 2 is located below the clamping mechanisms 3 and rotates with the clamping mechanisms 3 or is independently located on the rotation path of the clamping mechanisms 3. The insertion tube 4 has a first action of inserting into the packaging bag for gas replacement, a second action of partially removing the packaging bag to allow the heat-sealing assembly 2 to perform preliminary heat sealing on the packaging bag, and a third action of completely removing from the packaging bag. This technical solution separates the gas replacement device from the bag-feeding machine, and configures the rotating platform, clamping mechanisms, and heat-sealing assembly on the gas replacement device. It can clamp the packaging bag that has been fed and perform gas replacement and preheat sealing processes during rotation, which greatly ensures the gas replacement effect and improves the product qualification rate and packaging effect. In addition, setting the insertion tube to be removed from the packaging bag in stages, first raising the insertion tube an appropriate distance to allow the heat sealing component to preheat and seal the packaging bag, and then completely removing the insertion tube from the packaging bag, can prevent gas leakage or the introduction of impurity gases, and has the advantage of improving the gas replacement effect.

[0031] In this embodiment, gas replacement refers to inserting a cannula to evacuate the packaging bag or fill it with protective gas.

[0032] The clamping mechanism 3 includes a vertically arranged clamping drive 31, two opposing clamping plates 32, and a linkage component 33 connected to the output end of the clamping drive 31 and driving the clamping plates 32 to move towards and away from each other. The clamping drive is a cylinder, hydraulic cylinder, or linear motor, which drives the two clamping plates to clamp and release the packaging bag through the linkage component.

[0033] The rotating platform is provided with several horizontally mounted central shafts 331 along the circumference, and the central shafts 331 have a slot in the middle position to avoid the insertion of the tube; the linkage assembly 33 includes: A movable block 332 is installed at the output end of the clamping drive 31; Two bag clamping seats 333 are arranged opposite to each other and are rotatably mounted on the central shaft 331; Several connecting rods 334 are hinged at both ends to the movable block 332 and the bag clamping seat 333, respectively. The bag clamping plate 32 is fixedly installed on the inner side of each bag clamping seat 333. The clamping drive unit drives the moving block to perform lifting and lowering actions, and drives the two bag clamping seats to swing around the central axis through the connecting rod. During the swinging process, the two bag clamping plates move closer to each other or further away from each other.

[0034] The clamping plate 32 is provided with a notch 321 for the insertion tube 4 to pass through; the notch can prevent interference with the lifting and lowering movement of the insertion tube.

[0035] A soft pad 322 is installed on the inner side of the bag clamping plate 32. The soft pad can hold the packaging bag tightly without damaging it. The soft pad also fits tightly against the insertion tube to prevent gas from flowing out from the gap between the insertion tube and the bag clamping plate, thus having the advantage of good sealing performance.

[0036] In this technical solution, there are two embodiments of the heat-sealing assembly: one in which the heat-sealing assembly rotates along with the clamping mechanism, and the other in which the heat-sealing assembly is independently mounted on the rotation trajectory of the clamping assembly. Example 1: Several sets of clamping mechanisms 3 are evenly distributed and installed on the lower surface of the rotating platform, and a connecting shaft 335 is provided between the bag clamping seat 333 and the connecting rod 334 to connect the two. The heat sealing assembly 2 includes two first heat sealing plates 211 arranged opposite to each other and located below the bag clamping plate 32. A connecting frame 212 is provided between the first heat sealing plates 211 and the connecting shaft 335 to fix the two. The two first heat sealing plates move towards each other and away from each other synchronously with the bag clamping plate. After the bag clamping plate clamps the packaging bag, the first heat sealing plates on both sides do not contact the side wall of the packaging bag. At this time, the two heat sealing plates will not heat seal the packaging bag.

[0037] The heat-sealing assembly 2 further includes: Spring seat 213 is installed on the outer side of one end of each bag clamp 32 and has guide shaft 214 and spring 218 mounted thereon; The swing arm 215 has one end rotatably connected to the guide shaft 214 and the other end fixedly connected to the connecting shaft 335; The spring 218 is fitted onto the guide shaft 214 and both ends of the spring 218 abut against the spring seat 213 and the guide shaft 214 respectively; a roller 216 is installed at the outer end of the swing arm 215; The lifting pressure block 217 is independently set and located above the rotation trajectory of the roller 216. The lifting pressure block is independently set outside the rotating platform. It can be installed separately on a column or on a column for mounting the rotating platform. In addition, a driving component is set to drive the lifting pressure block to move up and down. This driving component can be a cylinder, hydraulic cylinder or linear motor. After the lifting pressure block descends, it contacts the roller, causing the swing arm to swing after receiving a force. When the swing arm rotates, it drives the first heat-sealing plate on the connecting shaft to move a certain distance towards the packaging bag through the connecting shaft. The two first heat-sealing plates approach the packaging bag together to preheat and seal it. Then, after the lifting pressure block rises and releases the pressure on the swing arm, the swing arm returns to its original position under the action of the spring, causing the two first heat-sealing plates to leave the packaging bag together, ending the preheat sealing work.

[0038] Example 2: The heat-sealing assembly 2 includes: The bracket 221 is located on the path of the rotation trajectory of the clamping mechanism 3; A heat-sealing drive component 222 is mounted on the bracket 221; The second heat-sealing plate 223 is connected to the output end of the heat-sealing drive component 222; The lower part of the bag clamping plate 32 extends from the extension 323 corresponding to the second heat sealing plate 223. The heat sealing drive can be a cylinder, a hydraulic cylinder, or a linear motor. After the bag clamping plate stops rotating, the heat sealing drive drives the second heat sealing plate to move towards the bag clamping plate. The second heat sealing plate and the extension cooperate to clamp the packaging bag, and then the second heat sealing plate heat seals it. After the heat sealing is completed, the second heat sealing plate is driven to move backward by the heat sealing drive.

[0039] An adjustment component for adjusting the left-right balance of the second heat-sealing plate 223 is provided between the output end of the heat-sealing drive component 222 and the second heat-sealing plate 223. The adjustment component includes: Connector 231 is fixedly connected to the output end of heat sealing drive 222; Adjustment plate 232 is installed on the side wall of the connector seat 231; The second heat-sealing plate 223 has a rearwardly extending mounting block 233 on its rear side. The adjusting plate 232 has a mounting groove 234 for the mounting block 233 to be inserted. The adjusting plate 232 has a positioning pin 235 that is vertically rotatably mounted and cooperates with the mounting block 233. Inserting the positioning pin can increase the degree of freedom of the second heat-sealing plate, allowing the second heat-sealing block to swing. This allows for a compensating action when the first heat-sealing plate and the extension come into contact, resulting in a better fit between the first heat-sealing plate and the extension and a better heat-sealing effect.

[0040] The rotating platform 1 is equipped with a first driving component 41 that drives the insertion tube 4 to move up and down. The output end of the first driving component 41 is equipped with a connecting plate 42 that is fitted and connected to the insertion tube 4. The rotating platform 1 is also equipped with a second driving component 43. The output end of the second driving component 43 is equipped with a pressure plate 44 that presses the connecting plate 42. The first driving component and the second driving component are cylinders, hydraulic cylinders or linear motors. The first driving component drives the connecting plate to move up and down. When the insertion tube descends, it is inserted into the packaging bag. When the insertion tube rises, the pressure plate can limit the rising height of the insertion tube so that the insertion tube does not have to be completely removed from the packaging bag, leaving a part of it in the inserted state. After the heat sealing is completed, the second driving component slightly releases the force on the pressure plate. The first driving component drives the connecting plate to overcome the resistance of the pressure plate and continue to move upward, so that the insertion tube is completely removed from the packaging bag.

[0041] The rotating platform 1 includes a main shaft 11, a second rotating plate 12 fixedly connected to the main shaft 11 and for mounting the clamping mechanism 3, and a first rotating plate 13 for mounting the insertion tube 4. The first rotating plate 13 has a first gear 14 rotatably engaged at its center and a third driving member 17 for driving the first gear 14 to rotate. The inner circumferential surface of the first gear 14 is threadedly engaged with the outer circumferential surface of the main shaft 11. A mounting seat 15 is fixedly connected below the first gear 14. A bearing 16 is provided between the inner ring of the first rotating plate 13 and the mounting seat 15. The third driving member is a motor, which drives the first rotating plate to move along the axial direction of the main shaft through the first gear. The first rotating plate can be adjusted in height to allow the insertion tube to adapt to packaging bags of different sizes and depths.

[0042] A bag-type packaging machine includes a turntable device 91 and a bag-feeding device 92, a barcode scanning device (not shown), a bag-opening device 94, a feeding device (not shown), a heat-sealing device 96, and a shaping and output device 97 arranged circumferentially around the turntable device 91. A gas replacement device as described above for the bag-type packaging machine is provided between the feeding device and the heat-sealing device 96, which has all the advantages of the gas replacement device described above.

[0043] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] Please note to all technical personnel: Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of protection of this patent.

Claims

1. A gas replacement device for a bag packaging machine, characterized in that: It includes a rotating platform (1), a heat sealing assembly (2), several sets of clamping mechanisms (3) installed below the rotating platform (1), and a cannula (4) that moves up and down in the clamping mechanism (3) for gas replacement. The heat sealing assembly (2) is located below the clamping mechanism (3) and rotates with the clamping mechanism (3) or is independently located on the rotation trajectory path of the clamping mechanism (3). The rotating platform (1) includes a main shaft (11), a second rotating plate (12) fixedly connected to the main shaft (11) and installed by the clamping mechanism (3), and a first rotating plate (13) for installing the insertion tube (4). The first rotating plate is provided with an adjustment component for adjusting the distance between the second rotating plate and the first rotating plate, thereby adjusting the initial depth of the insertion tube into the packaging bag.

2. The gas replacement device for a bag packaging machine according to claim 1, characterized in that: The cannula (4) has a first action of inserting into the packaging bag to perform gas replacement, a second action of partially removing from the packaging bag to allow the heat sealing assembly (2) to perform preliminary heat sealing on the packaging bag, and a third action of completely removing from the packaging bag.

3. The gas replacement device for a bag packaging machine according to claim 1, characterized in that: The clamping mechanism (3) includes a vertically arranged clamping drive (31), two oppositely arranged bag clamping plates (32), and a linkage component (33) connected to the output end of the clamping drive (31) and driving the bag clamping plates (32) to move towards and away from each other.

4. The gas replacement device for a bag packaging machine according to claim 3, characterized in that: The rotating platform is provided with several central shafts (331) installed horizontally along the circumference, and the central shafts (331) have slots in the middle to avoid the insertion of tubes; the linkage assembly (33) includes: A movable block (332) is mounted on the output end of the clamping drive (31); Two bag holders (333) are arranged opposite to each other and are rotatably mounted on the central shaft (331); Several connecting rods (334) are hinged at both ends to the movable block (332) and the bag holder (333), respectively; The bag clamping plate (32) is fixedly installed on the inner side of each bag clamping seat (333).

5. The gas replacement device for a bag packaging machine according to claim 4, characterized in that: The bag clamp (32) is provided with a notch (321) for the insertion tube (4) to pass through. A soft pad (322) is installed on the inner side of the bag clamp (32).

6. The gas replacement device for a bag packaging machine according to claim 4, characterized in that: Several sets of clamping mechanisms (3) are evenly distributed on the lower surface of the rotating platform, and a connecting shaft (335) is provided between the bag clamp (333) and the connecting rod (334). The heat sealing assembly (2) includes two first heat sealing plates (211) arranged opposite to each other and located below the bag clamping plate (32), and a connecting frame (212) is provided between the first heat sealing plates (211) and the connecting shaft (335) to fix the two.

7. The gas replacement device for a bag packaging machine according to claim 6, characterized in that: The heat-sealing assembly (2) further includes: A spring seat (213) is mounted on the outer side of one end of each bag clamp (32) and has a guide shaft (214) and a spring (218) mounted thereon. A swing arm (215), one end of which is rotatably connected to the guide shaft (214) and the other end of which is fixedly connected to the connecting shaft (335); The spring (218) is mounted on the guide shaft (214) and the two ends of the spring (218) are respectively in contact with the spring seat (213) and the guide shaft (214); a roller (216) is installed at the outer end of the swing arm (215). The lifting pressure block (217) is independently set and located above the rotation trajectory of the roller (216).

8. The gas replacement device for a bag packaging machine according to claim 4, characterized in that: The heat-sealing assembly (2) includes: The bracket (221) is located on the path of the rotation trajectory of the clamping mechanism (3); A heat-sealing drive (222) is mounted on the bracket (221); The second heat-sealing plate (223) is connected to the output end of the heat-sealing drive (222); The lower part of the bag clamp (32) extends from the extension (323) corresponding to the second heat-sealing plate (223).

9. The gas replacement device for a bag packaging machine according to claim 8, characterized in that: An adjustment component for adjusting the left-right balance of the second heat-sealing plate (223) is provided between the output end of the heat-sealing drive (222) and the second heat-sealing plate (223). The adjustment component includes: Connector base (231), which is fixedly connected to the output end of heat sealing drive (222); Adjustment plate (232), which is mounted on the side wall of the connector seat (231); The second heat-sealing plate (223) has a rearwardly extending mounting block (233) on its rear side. The adjusting plate (232) has a mounting groove (234) for the mounting block (233) to be inserted. The adjusting plate (232) has a positioning pin (235) that is vertically rotatably mounted and cooperates with the mounting block (233).

10. The gas replacement device for a bag packaging machine according to claim 1, characterized in that: The rotating platform (1) is provided with a first driving member (41) that drives the insertion tube (4) to move up and down. The output end of the first driving member (41) is provided with a connecting plate (42) that is fitted and connected to the insertion tube (4). The rotating platform (1) is also provided with a second driving member (43). The output end of the second driving member (43) is provided with a pressure plate (44) that presses the connecting plate (42).

11. The gas replacement device for a bag packaging machine according to claim 1, characterized in that: The adjustment assembly includes a first gear (14) rotatably mounted at the center of the first rotating plate (13) and a third driving member (17) for driving the first gear (14) to rotate. The inner circumferential surface of the first gear (14) is threadedly engaged with the outer circumferential surface of the main shaft (11). A mounting seat (15) is fixedly connected below the first gear (14). A bearing (16) is provided between the inner ring of the first rotating plate (13) and the mounting seat (15).

12. A bag-type packaging machine, comprising a turntable device (91) and a bag-feeding device (92), a barcode scanning device, a bag-opening device (94), a feeding device, a heat-sealing device (96), and a shaping and output device (97) arranged circumferentially around the turntable device (91), characterized in that: A gas replacement device for a bag-type packaging machine as described in any one of claims 1-10 is provided between the feeding device and the heat sealing device (96).

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