Three-station bag preparation mechanism and working method thereof

Abstract

The invention relates to a three-station bag preparation mechanism and a working method thereof, and the three-station bag preparation mechanism comprises a bag preparation frame, and a first bag preparation station, a second bag preparation station and a bag taking station which are arranged on the bag preparation frame side by side at intervals, the bag preparing frame is provided with a bag preparing and feeding mechanism used for pushing the standby packaging bags on the first bag preparing station or the second bag preparing station to the bag taking station in sequence. The three-station bag preparation mechanism is reasonable in design, the bag storage amount can be increased, the frequency of supplementing packaging bags by workers is reduced, and the working efficiency is improved.

Description

TECHNICAL FIELD The present application relates to a bag preparation mechanism in a packaging device, in particular to a three-station bag preparation mechanism and a working method thereof. BACKGROUND The bag preparation mechanism is an important part of a full-automatic packaging machine, and directly affects the workload and work efficiency of workers. The common bag preparation mechanism of a full-automatic packaging machine adopts a double-station, and the workers need to supplement the packaging bags more frequently and the storage capacity of the bags is less.

[0001] For example, Chinese patent "Double-station bag preparation mechanism", publication number CN216784024U, the double-station bag preparation mechanism includes a rack and a synchronous belt transmission mechanism arranged on the rack, two sides above the rack are respectively provided with a first bag storage mechanism and a second bag storage mechanism that can be lifted, the first bag storage mechanism is connected with the upper part of the synchronous belt transmission mechanism, the second bag storage mechanism is connected with the lower part of the synchronous belt transmission mechanism, and the second bag storage mechanism after being lifted is staggered in height with the first bag storage mechanism to switch with each other, the first bag storage mechanism and the second bag storage mechanism that can be lifted are linked to realize the high-low staggered switching through the synchronous belt transmission mechanism, the space occupied is small, and the cost is lower; but the bag preparation mechanism adopts a double-station, and the workers need to supplement the packaging bags more frequently and the storage capacity of the bags is less.

[0002] For example, Chinese patent "Automatic packaging machine for heavy bags", publication number CN119460312A, includes a rack, a bag preparation mechanism, a feeding mechanism, a conveying mechanism, a bag sewing mechanism, a bag feeding mechanism, a bag clamping and feeding mechanism, and a bag unloading mechanism are arranged on the rack, the bag preparation mechanism includes a supporting plate for placing heavy bags, a bag supplementing assembly for supplementing heavy bags to the supporting plate, a bag suction member, a supporting member, a driving assembly for driving the supporting member to move, and a buffer member; the present application stores the heavy bags for standby through the bag supplementing assembly, and after the heavy bags on the supporting plate are conveyed, the standby heavy bags are conveyed to the supporting plate, so that the heavy bags are continuously conveyed without interruption, and the overall packaging efficiency is improved; the first end top of the heavy bag placed on the supporting table is sucked by the second suction device, the bottom of the heavy bag is sucked by the third suction device, and the fourth driving member drives the second suction device to move upward, so that the bag opening of the heavy bag is opened, and the heavy bag is opened in the placing area, thereby improving the overall packaging efficiency; but the bag preparation area of the device only has one, and the workers need to supplement the packaging bags more frequently. SUMMARY In view of the problems existing in the prior art, the purpose of the present application is to provide a three-station bag preparation mechanism and a working method thereof, which is reasonable in design, helps to increase the storage capacity of bags, reduces the frequency of workers supplementing packaging bags, and improves the work efficiency.

[0003] The present application adopts the following scheme to achieve, The application comprises a standby bag frame, a first standby bag station, a second standby bag station and a bag taking station which are arranged side by side on the standby bag frame, and a standby bag feeding mechanism which is arranged on the standby bag frame and is used to push the standby packaging bags on the first standby bag station or the second standby bag station to the bag taking station in sequence.

[0004] Preferably, the standby bag feeding mechanism comprises a bag moving fixing plate which is driven to extend and retract by a bag feeding cylinder, a push rod and a bag feeding swing rod which are arranged on the bag moving fixing plate, the first standby bag station is located between the push rod and the bag feeding swing rod, and the second standby bag station is located on the side of the bag feeding swing rod away from the push rod.

[0005] Preferably, the standby bag feeding mechanism further comprises a first linear bearing, a first swing rod cylinder, a bag moving guide shaft, a first joint bearing and a bag moving cylinder transition frame, the bag moving guide shaft is fixedly installed on the standby bag frame, the first linear bearing is installed on the bag moving guide shaft and can slide axially on the bag moving guide shaft, the bag moving fixing plate is fixedly installed on the first linear bearing, the push rod and the first joint bearing are fixedly installed on the bag moving fixing plate, the lateral shafts of the bag feeding swing rod are installed on the first joint bearing, one end of the first swing rod cylinder is installed on the bag moving fixing plate, the guide rod end of the first swing rod cylinder is hingedly connected with the swing arm free end of the bag feeding swing rod, the extension and retraction of the first swing rod cylinder drives the bag feeding swing rod to rotate on the first joint bearing, the bag moving cylinder transition frame is installed on the bag moving fixing plate, one end of the bag feeding cylinder is installed on the standby bag frame, the guide rod end of the bag feeding cylinder is installed on the bag moving cylinder transition frame, and the extension and retraction of the bag feeding cylinder drives the whole standby bag feeding mechanism to slide on the bag moving guide shaft.

[0006] Preferably, the bag moving fixing plate is further provided with a first standby bag station photoelectric sensor and a second standby bag station photoelectric sensor which are used to detect whether there are standby packaging bags on the first standby bag station and the second standby bag station.

[0007] Preferably, the bag taking station is provided with a left bag arranging plate, a right bag arranging plate and a second linear bearing which are arranged in sequence and are fixedly arranged on the left bag arranging plate and the right bag arranging plate, the left bag arranging plate is closer to the standby bag feeding mechanism than the right bag arranging plate, the second linear bearing is slidingly connected with the bag moving guide shaft, the left bag arranging plate is provided with a first bag arranging swing rod, the right bag arranging plate is provided with a second bag arranging push rod, the bag taking station is formed between the first bag arranging swing rod and the second bag arranging push rod, and a centering mechanism is arranged between the left bag arranging plate and the right bag arranging plate to center the packaging bags on the bag taking station.

[0008] Preferably, the centering mechanism comprises a linkage pin, a linkage crank, a clamping cylinder and a linkage pull rod, the linkage crank is rotatably connected with the standby bag frame through the linkage pin, the two ends of the linkage crank are both rotatably connected with the first end of the linkage pull rod through the linkage pin, the second end of the linkage pull rod is rotatably connected with the left bag arranging plate or the right bag arranging plate through the linkage pin, the left bag arranging plate is further connected with the guide rod end of the clamping cylinder, and the cylinder body end of the clamping cylinder is connected with the standby bag frame.

[0009] Preferably, the bag-picking station is further provided with a second joint bearing and a second swing arm cylinder. The second swing arm cylinder is mounted on the second joint bearing through a cylinder rotating seat. The guide rod end of the second swing arm cylinder is hinged to the first bag-sorting swing arm. The two ends of the horizontal axis of the first bag-sorting swing arm are mounted on the second joint bearing. The first bag-sorting swing arm can be rotated by extending and retracting the guide rod of the second swing arm cylinder.

[0010] Preferably, the bag-picking station is also equipped with a photoelectric sensor for detecting whether there are packaging bags at the station.

[0011] The working method of the three-station bag preparation mechanism of the present invention is characterized by: When the bag-taking station is out of bags and the first and second backup bag stations detect bags, the guide rod of the bag-feeding cylinder extends, driving the entire backup bag-feeding mechanism to move towards the bag-taking station. During this process, the guide rod of the first swing cylinder is in a retracted state, keeping the vertical rod of the bag-feeding swing rod in a vertical position. This allows the vertical rod to push the bag at the second backup bag station to move, while the push rod pushes the bag at the first backup bag station. After the bag at the second backup bag station is delivered to the bag-taking station, the guide rod of the first swing cylinder extends, causing the vertical rod of the bag-feeding swing rod to rotate to a horizontal position. This prevents the retraction of the vertical rod from bringing back the bag that has already entered the bag-taking station, and also causes the bag that was originally located at the first backup bag station to be pushed and remain at the second backup bag station. Then, the guide rod of the bag-feeding cylinder retracts, driving the entire backup bag-feeding mechanism back to its origin.

[0012] When the photoelectric sensor detects a missing bag at the bag-picking station, the guide rod of the second swing arm cylinder retracts, causing the vertical rod of the first bag-sorting swing arm to rotate to a horizontal position. The guide rod of the clamping cylinder extends, driving the left bag-sorting mechanism to move outward to its limit. Simultaneously, power is transmitted to the right bag-sorting mechanism through the linkage rod and linkage crank, and the right bag-sorting mechanism also moves outward to its limit. When the packaging bag at the second spare bag station is pushed to the bag-picking position, the spare bag pushing mechanism returns to its original position. The guide rod of the second swing arm cylinder extends, causing the vertical rod of the first bag-sorting swing arm to rotate to a vertical position. The guide rod of the clamping cylinder retracts, driving the left bag-sorting mechanism to move inward. Simultaneously, power is transmitted to the right bag-sorting mechanism through the linkage rod and linkage crank, and the right bag-sorting mechanism also moves inward, forming a closing action to center the packaging bag located at the bag-picking station. Attached image description: The present invention will be further described below with reference to the accompanying drawings; Figure 1 , 2 Figures 3 and 4 are three-dimensional structural diagrams of the present invention; Figure 4 , 5 yes Figure 2 A schematic diagram of the local structure; Figure 6 , 7 yesFigure 3 is a schematic view of the local structure of the bag feeding mechanism.

[0013] Figure 8 is a perspective view of the bag feeding mechanism; Figure 9 is a perspective view of the first bag feeding mechanism; DETAILED DESCRIPTION The present application will be further described below in conjunction with the drawings and specific embodiments.

[0014] The three-station bag preparation mechanism mainly consists of a bag preparation feeding mechanism 1, a left bag preparation mechanism 2, a right bag preparation mechanism 3, and a bag preparation frame A1, and the overall structure is shown in Figure 1 .

[0015] The bag feeding process is shown in Figure 1 : The packaging bags are flatly stacked on the upper surface of the first bag preparation station 4 and the second bag preparation station 5 of the bag preparation frame A1 (the packaging bags can move on the upper surface of the bag preparation frame A1), and when the bag taking station detection photoelectric sensor B11 does not detect a packaging bag, it indicates that there is a missing bag; the bag preparation feeding mechanism 1 pushes the packaging bag on the second bag preparation station 5 to the bag taking station 6 under the action of the air cylinder, while the packaging bag on the first bag preparation station 4 is pushed to the second bag preparation station 5, and then the bag preparation feeding mechanism 1 retreats to the original position, and the centering action of the left bag preparation mechanism 2 and the right bag preparation mechanism 3 folds the packaging bag at the bag taking station to the center position.

[0016] The bag preparation feeding mechanism 1 is described in conjunction with Figure 2 , which includes a bag preparation frame A1, a push rod A2, a first linear bearing A3, a bag preparation station photoelectric sensor A4, a bag moving fixed plate A5, a first swing rod air cylinder A6, a bag feeding swing rod A7, a bag preparation station photoelectric sensor A8, a bag feeding air cylinder A9, a bag moving guide shaft A10, a first joint bearing A11, and a bag moving air cylinder transition frame A12.

[0017] The bag preparation frame A1 is a rectangular frame, the bag moving guide shaft A10 is installed in the length direction of the bag preparation frame A1, the first linear bearing A3 is installed on the bag moving guide shaft A10 and can slide axially on the bag moving guide shaft A10, and the bag moving fixed plate A5 is installed on the four first linear bearings A3 (specifically, the bag preparation frame A1 has two bag moving guide shafts A10, each bag moving guide shaft A10 has two first linear bearings A3, and the four first linear bearings A3 are fixedly installed at the four corners of the rectangular bag moving fixed plate A5).

[0018] A plurality of push rods A2 and a first joint bearing A11 are fixedly installed on the bag moving fixing plate A5, wherein the push rods A2 are installed vertically close to the first end of the bag moving fixing plate A5 (the push rods A2 are used to push the packaging bags in the first bag standby station 4), and the first joint bearing A11 is installed close to the second end of the bag moving fixing plate A5. The first end of the bag moving fixing plate A5 is the end relatively far away from the bag taking station 6, and the second end of the bag moving fixing plate A5 is the end relatively close to the bag taking station 6.

[0019] The bag entering swing rod A7 comprises a horizontal shaft A71, a plurality of vertical rods A72 vertically connected to the horizontal shaft, and a swing arm A73 bently connected to a vertical rod. The horizontal shaft of the bag entering swing rod A7 is installed on the first joint bearing A11 at both ends, one end (the cylinder body end) of the first swing rod air cylinder A6 is installed on the bag moving fixing plate A5, the guide rod end of the first swing rod air cylinder A6 is hingedly connected to the free end of the swing arm of the bag entering swing rod A7, and the extension and retraction action of the first swing rod air cylinder A6 can drive the bag entering swing rod A7 to rotate on the first joint bearing A11, that is, the vertical rods of the bag entering swing rod A7 can be in a vertical station or a horizontal station. When the vertical rods are in the vertical station, the vertical rods are used to push the packaging bags in the second bag standby station 5.

[0020] The bag moving air cylinder transition frame A12 is installed on the bag moving fixing plate A5, one end (the cylinder body end) of the bag entering air cylinder A9 is installed on the bag standby frame A1, the guide rod end of the bag entering air cylinder A9 is installed on the bag moving air cylinder transition frame A12, the extension and retraction of the bag entering air cylinder A9 drives the entire bag standby and bag entering mechanism to slide on the bag moving guide shaft A10, the bag standby station photoelectric sensor one A4 and the bag standby station photoelectric sensor two A8 are arranged on the bag standby frame A1 corresponding to the positions of the first bag standby station 4 and the second bag standby station 5, and are used to detect whether the first bag standby station 4 and the second bag standby station 5 have packaging bags. The bag standby station photoelectric sensor one A4 and the bag standby station photoelectric sensor two A8 can be infrared photoelectric sensors.

[0021] The working principle of the spare bag feeding mechanism 1 is as follows: when the bag taking station is out of bags (the detection is a conventional technology, and the specific working principle is not described here) and the first spare bag station and the second spare bag station are detected to have packaging bags (the detection is a conventional technology, and the specific working principle is not described here), the feeding cylinder A9 guide rod is extended, driving the entire spare bag feeding mechanism to move to the bag taking station. During the process, the guide rod of the first swing rod cylinder A6 is in the retracted state, so that the vertical rod of the feeding swing rod A7 remains in the vertical position (to push the packaging bags on the second spare bag station and the push rod A2 pushes the packaging bags on the first spare bag station), after the packaging bags on the second spare bag station are sent to the bag taking station, the guide rod of the first swing rod cylinder A6 is extended, so that the vertical rod of the feeding swing rod A7 is turned to the horizontal position (to prevent the packaging bags in the bag taking station from being brought back when the vertical rod of the feeding swing rod A7 is retracted, and to make the packaging bags originally located in the first spare bag station 4 be pushed and stay in the second spare bag station 5), and then the guide rod of the feeding cylinder A9 is retracted, driving the entire spare bag feeding mechanism to return to the original position.

[0022] The left bag straightening mechanism 2 and the right bag straightening mechanism 3 are shown in combination. Figure 3 The left bag straightening mechanism 2 and the right bag straightening mechanism 3 include a bag moving push rod B1, a rodless cylinder B3, a second linear bearing B4, a second bag straightening push rod B5, a left bag straightening plate B9, a linkage pin B7, a linkage crank B8, a right bag straightening plate B6, a detection photoelectric sensor B11, a clamping cylinder B12, a linkage pull rod B13, a second swing rod cylinder B14, a folding cylinder transition plate B15, a first bag straightening swing rod B16, and a second joint bearing B17.

[0023] The four second linear bearings B4 are respectively installed on the two bag moving guide shafts A10 to slide axially on the bag moving guide shafts A10. The right bag straightening plate B6 is installed on the two second linear bearings B4. The bag moving push rod B1 (which has the same effect as the second bag straightening push rod B5 and is used to push the packaging bags), the rodless cylinder B3, the second bag straightening push rod B5, and the detection photoelectric sensor B11 are installed on the right bag straightening plate.

[0024] The middle part of the linkage crank B8 is rotationally connected to the spare bag frame A1 through the linkage pin B7, so that the linkage crank B8 can rotate freely. The two ends of one linkage pull rod B13 are connected to one end of the linkage crank B8 and the right bag straightening plate through the linkage pin B7, respectively. The two ends of the other linkage pull rod B13 are connected to the other end of the linkage crank B8 and the left bag straightening plate through the linkage pin B7.

[0025] The left bag arranging plate is installed on two second linear bearings B4, the closing cylinder transition plate B15 and the second joint bearing B17 are installed on the left bag arranging plate, the second swing rod cylinder B14 is installed on the joint bearing through a cylinder rotating seat, the first bag arranging swing rod B16 comprises a horizontal shaft, a plurality of vertical rods vertically connected to the horizontal shaft, and swing arms arranged in a staggered manner with the vertical rods (the staggered manner refers to the staggered arrangement in the axial direction and the circumferential direction of the horizontal shaft), one end of the swing arm is fixedly connected to the horizontal shaft in a perpendicular manner, the other end of the swing arm is hingedly connected to the guide rod end of the second swing rod cylinder B14, the horizontal shaft of the first bag arranging swing rod B16 is installed on the second joint bearing B17 at both sides of the horizontal shaft, and the horizontal shaft of the first bag arranging swing rod B16 can be rotated through the extension and retraction action of the guide rod of the second swing rod cylinder B14, so that the vertical rods of the first bag arranging swing rod B16 can be in a vertical working position or a horizontal working position, one end of the closing cylinder B12 is installed on the bag frame A1, and the guide rod end of the closing cylinder B12 is installed on the closing cylinder transition plate B15.

[0026] The left bag arranging mechanism 2 comprises the left bag arranging plate B9 and components thereon, the right bag arranging mechanism 3 comprises the right bag arranging plate B6 and components thereon, and the centering mechanism comprises the linkage pin B7, the linkage crank B8, the closing cylinder B12 and the linkage pull rod B13.

[0027] The working principle of the left bag arranging mechanism 2 and the right bag arranging mechanism 3 is as follows: when the detection photoelectric sensor B11 detects that the bag taking position is empty (the detection is a conventional technology, and the specific working principle is not described here), the slider of the rodless cylinder B3 is lifted to the highest position, the guide rod of the second swing rod cylinder B14 is retracted, the vertical rods of the first bag arranging swing rod B16 are rotated to the horizontal working position (so that the packaging bag in the second bag arranging position can be pushed into the bag taking position), the guide rod of the closing cylinder B12 is extended to drive the left bag arranging mechanism 2 to move outward to the limit, and power is transmitted to the right bag arranging mechanism 3 through the linkage pull rod B13 and the linkage crank B8, so that the right bag arranging mechanism also moves outward to the limit; after the packaging bag in the second bag arranging position is pushed into the bag taking position, the bag arranging and pushing mechanism moves back to the original position, the guide rod of the second swing rod cylinder B14 is extended, the vertical rods of the first bag arranging swing rod B16 are rotated to the vertical state, the guide rod of the closing cylinder B12 is retracted to drive the left bag arranging mechanism to move inward, and power is transmitted to the right bag arranging mechanism through the linkage pull rod B13 and the linkage crank B8, so that the right bag arranging mechanism also moves inward to form a closing action, and the packaging bag in the bag taking position is centered (that is, the packaging bag is centered between the second bag arranging push rod B5 and the vertical rods of the first bag arranging swing rod B16).

[0028] After that, the rodless cylinder B3 slider is lowered to slightly press the packaging bag on the bag taking station (to avoid the following suction cup sucking the packaging bag on the surface layer, the next layer of packaging bag is adsorbed on the lower surface of the packaging bag on the surface layer due to static electricity and other reasons, the pressing force of the rodless cylinder B3 is smaller, which is slightly larger than the static adsorption force of the adjacent packaging bag, so that the next layer of packaging bag is retained in the station), the above holding cylinder B12 can be set to stop at any position in the stroke, so it can adapt to packaging bags of different widths, when the bag taking mechanism takes the packaging bag upwards, the rodless cylinder B3 slider is temporarily lifted to release the packaging bag and then immediately pressed down to prevent affecting the next packaging bag.

[0029] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range of the present application claimed.

Claims

1. A three-station bag preparation mechanism, characterized in that: It includes a bag preparation frame (A1), a first bag preparation station, a second bag preparation station, and a bag retrieval station arranged side by side and spaced apart on the bag preparation frame (A1). The bag preparation frame (A1) is provided with a bag feeding mechanism that pushes the spare packaging bags on the first bag preparation station or the second bag preparation station to the bag retrieval station in sequence.

2. The three-station bag preparation mechanism according to claim 1, characterized in that: The bag preparation and feeding mechanism includes a bag transfer fixing plate (A5) driven to extend and retract by a bag feeding cylinder (A9), a push rod (A2) spaced apart on the bag transfer fixing plate (A5), and a bag feeding swing rod (A7). The first bag preparation station is located between the push rod (A2) and the bag feeding swing rod (A7), and the second bag preparation station is located on the side of the bag feeding swing rod (A7) away from the push rod (A7).

3. The three-station bag preparation mechanism according to claim 2, characterized in that: The bag preparation and feeding mechanism further includes a first linear bearing (A3), a first swing rod cylinder (A6), a bag transfer guide shaft (A10), a first spherical bearing (A11), and a bag transfer cylinder transition frame (A12). The bag transfer guide shaft (A10) is fixedly installed on the bag preparation frame (A1). The first linear bearing (A3) is installed on the bag transfer guide shaft (A10) and can slide axially on the bag transfer guide shaft (A10). The bag transfer fixing plate (A5) is fixedly installed on the first linear bearing (A3). The push rod (A2) and the first spherical bearing (A11) are fixedly installed on the bag transfer fixing plate (A5). The two ends of the horizontal axis of the bag feeding swing rod (A7) are installed on the first spherical bearing. On (A11), one end of the first swing rod cylinder (A6) is mounted on the bag transfer fixing plate (A5). The guide rod end of the first swing rod cylinder (A6) is hinged to the free end of the swing arm of the bag inlet swing rod (A7). The extension and retraction of the first swing rod cylinder (A6) drives the bag inlet swing rod (A7) to rotate on the first joint bearing (A11). The bag transfer cylinder transition frame (A12) is mounted on the bag transfer fixing plate (A5). One end of the bag inlet cylinder (A9) is mounted on the bag preparation frame (A1). The guide rod end of the bag inlet cylinder (A9) is mounted on the bag transfer cylinder transition frame (A12). The extension and retraction of the bag inlet cylinder (A9) drives the entire bag preparation and bag inlet mechanism to slide on the bag transfer guide shaft (A10).

4. The three-station bag preparation mechanism according to claim 3, characterized in that: The bag transfer fixing plate (A5) is also equipped with a backup bag station photoelectric sensor one (A4) and a backup bag station photoelectric sensor two (A8) for detecting whether there are backup packaging bags at the first backup bag station and the second backup bag station.

5. The three-station bag preparation mechanism according to claim 1, characterized in that: Above the bag-picking station are a left bag-feeding plate (B9) and a right bag-feeding plate (B6) spaced apart, and a second linear bearing (B4) fixed on the left bag-feeding plate (B9) and the right bag-feeding plate (B6) respectively. The left bag-feeding plate (B9) is closer to the bag-feeding mechanism than the right bag-feeding plate (B6). The second linear bearing (B4) is slidably connected to the bag-moving guide shaft (A10). The left bag-feeding plate (B9) is provided with a first bag-feeding swing rod (B16), and the right bag-feeding plate (B6) is provided with a second bag-feeding push rod (B5). The first bag-feeding swing rod (B16) and the second bag-feeding push rod (B5) form a bag-picking station. An alignment mechanism is provided between the left bag-feeding plate (B9) and the right bag-feeding plate (B6) to align the packaging bags at the bag-picking station.

6. The three-station bag preparation mechanism according to claim 5, characterized in that: The centering mechanism includes a linkage pin (B7), a linkage crank (B8), a clamping cylinder (B12), and a linkage rod (B13). The linkage crank (B8) is rotatably connected to the spare bag frame (A1) via the linkage pin (B7). Both ends of the linkage crank (B8) are rotatably connected to the first end of the linkage rod (B13) via the linkage pin (B7). The second end of the linkage rod (B13) is rotatably connected to the left bag sorting plate (B9) or the right bag sorting plate (B6) via the linkage pin (B7). The left bag sorting plate (B9) is also connected to the guide rod end of the clamping cylinder (B12). The cylinder body end of the clamping cylinder (B12) is connected to the spare bag frame (A1).

7. The three-station bag preparation mechanism according to claim 6, characterized in that: The bag-picking station is also equipped with a second joint bearing (B17) and a second swing arm cylinder (B14). The second swing arm cylinder (B14) is mounted on the second joint bearing through a cylinder rotating seat. The guide rod end of the second swing arm cylinder (B14) is hinged to the first bag-sorting swing arm (B16). The two ends of the horizontal axis of the first bag-sorting swing arm (B16) are mounted on the second joint bearing (B17). The first bag-sorting swing arm (B16) can be rotated by the extension and retraction of the guide rod of the second swing arm cylinder (B14).

8. The three-station bag preparation mechanism according to claim 7, characterized in that: The bag-picking station is also equipped with a photoelectric sensor (B11) for detecting whether there are packaging bags at the station.

9. A working method for a three-station bag preparation mechanism, characterized in that: When the bag-picking station is out of bags and both the first and second backup bag stations detect bags, the guide rod of the bag-feeding cylinder (A9) extends, driving the entire backup bag feeding mechanism to move towards the bag-picking station. During this process, the guide rod of the first swing rod cylinder (A6) is in the retracted state, keeping the vertical rod of the bag-feeding swing rod (A7) in a vertical position, so as to push the packaging bag on the second backup bag station through the vertical rod. At the same time, the push rod (A2) pushes the packaging bag located on the first backup bag station. After the packaging bag on the bag preparation station is sent to the bag taking station, the guide rod of the first swing cylinder (A6) extends, causing the vertical rod of the bag inlet swing rod (A7) to rotate to the horizontal position, so that the retraction of the vertical rod of the bag inlet swing rod (A7) will not bring back the packaging bag that has entered the bag taking station, and the packaging bag that was originally located at the first bag preparation station (4) is pushed and left at the second bag preparation station (5). Then the guide rod of the bag inlet cylinder (A9) retracts, driving the entire bag preparation and bag inlet mechanism back to the origin.

10. The working method of the three-station bag preparation mechanism according to claim 9, characterized in that: When the photoelectric sensor (B11) detects a missing bag at the bag-taking station, the guide rod of the second swing cylinder (B14) retracts, causing the vertical rod of the first bag-sorting swing rod (B16) to rotate to the horizontal position. The guide rod of the clamping cylinder (B12) extends, driving the left bag-sorting mechanism (2) to move outward to its limit. At the same time, the power is transmitted to the right bag-sorting mechanism (3) through the linkage rod (B13) and the linkage crank (B8), and the right bag-sorting mechanism also moves outward to its limit. When the packaging at the second bag-preparation station... After the bag is pushed to the bag-taking position, the bag-pushing mechanism moves back to its original position, and the guide rod of the second swing cylinder (B14) extends, causing the vertical rod of the first bag-sorting swing rod (B16) to rotate to a vertical position. The guide rod of the clamping cylinder (B12) retracts, causing the left bag-sorting mechanism to move inward. At the same time, the power is transmitted to the right bag-sorting mechanism through the linkage rod (B13) and linkage crank (B8). The right bag-sorting mechanism also moves inward, forming a closing action, thus centering the packaging bag located in the bag-taking position.

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