Double-station bag supply device and high-speed bag supply method

Abstract

A double-station bag supply device belongs to the field of packaging machinery and comprises a bottom frame, a bag supporting plate is arranged at the upper end of the bottom frame, a first bag taking position, a temporary storage position and a second bag taking position are sequentially arranged at the upper end of the front portion of the bag supporting plate in the longitudinal direction, bag taking mechanisms are arranged above the first bag taking position and the second bag taking position respectively, and bag opening mechanisms are arranged on the left sides of the lower portions of the bag taking mechanisms. A swing arm bagging mechanism is arranged above the bag opening mechanism, a bag pushing mechanism is arranged on the second bag taking position, a rear bag pushing device capable of vertically ascending and descending is arranged on the bag pushing mechanism, and when the rear bag pushing device ascends to the position above the horizontal end face of the bag supporting plate, empty bag stacks on the second bag taking position can be pushed to the temporary storage position or the first bag taking position. A bag storage pushing mechanism is arranged behind the first bag taking position and can push the empty bag stacks on the buffering position to the first bag taking position, and the bag storage pushing mechanism is arranged behind the second bag taking position and can horizontally push the empty bag stacks arranged on the bag storage position to the second bag taking position. According to the double-station bag supply device, all the mechanisms are coordinated and matched, the compact-layout double-station bag supply method is achieved, and the overall packaging efficiency is improved.

Description

Technical Field

[0001] The invention relates to a double-station bag supply device and a high-speed bag supply method, belonging to the field of packaging machinery. Background Art

[0002] Patent document CN219601650U discloses a double-station rotary fully automatic high-speed packaging machine, which utilizes a double-station bag feeding machine to realize synchronous bag feeding. Although its structure can increase the bag feeding speed, the two groups of bag feeding machines are independently arranged, and bag feeding conveying mechanisms need to be separately configured to realize the supply of material bags. Therefore, the packaging machine will have a complex structure, occupy a large space, and have limited applicable sites. Summary of the invention

[0003] In order to solve the problems of complex structure, large space occupation and poor applicability of the existing double-station bag supply device, the present invention proposes a double-station bag supply device, which includes a base frame, a bag holding plate arranged horizontally in the longitudinal direction is provided on the upper end of the base frame, a first bag taking position, a buffer position and a second bag taking position are provided on the front upper end of the bag holding plate in sequence along the longitudinal direction, a bag taking mechanism that can move up and down and left and right is provided above the first bag taking position and the second bag taking position respectively, a bag opening mechanism that can be vertically lifted and lowered is provided on the left side below the bag taking mechanism, the bag opening mechanism is connected to the base frame, a swing arm bagging mechanism is provided above the bag opening mechanism, the swing arm bagging mechanism and the bag taking mechanism are both connected to the external frame, and the lower end of the bag holding plate is provided with a bag holding mechanism between the second bag taking position and the first bag taking position. The bag pushing mechanism is capable of moving longitudinally and horizontally between the two bag taking positions, and the bag pushing mechanism is provided with a rear bag pushing device which can be lifted and lowered vertically. The rear bag pushing device can be lifted to above the horizontal end surface of the bag supporting plate or lowered to below the horizontal end surface of the bag supporting plate. When the rear bag pushing device is lifted to above the horizontal end surface of the bag supporting plate, it can push the empty bag stack on the second bag taking position to the cache position or the first bag taking position, and can push the empty bag stack on the cache position to the first bag taking position. A bag storing pushing mechanism is provided behind the second bag taking position, and a plurality of pushing plates are evenly arranged on the bag storing pushing mechanism. The spacing between the two groups of pushing plates matches the width of the empty bags. The pushing plates divide the bag supporting plate into a plurality of bag storing positions along the longitudinal direction. The bag storing pushing mechanism can horizontally push the empty bag stacks arranged on the bag storing positions to the second bag taking position.

[0004] The bag pushing mechanism includes a bag pushing trolley, a rear bag pusher is provided at the rear end of the bag pushing trolley, and a front bag pusher is provided in front of the rear bag pusher. The spacing between the front bag pusher and the rear bag pusher matches the width of the empty bag. The front bag pusher can be raised to above the horizontal end surface of the bag supporting plate or lowered to below the horizontal end surface of the bag supporting plate. The bag pushing trolley is hinged to the cylinder rod of the bag pushing cylinder, and the cylinder body of the bag pushing cylinder is hinged to the lower end of the base frame. The bag pushing cylinder drives the rear bag pusher and the front bag pusher to move along the longitudinally horizontally arranged guide mechanism to realize the bag pushing action. When the front bag pusher and the rear bag pusher are both raised to above the horizontal end surface of the bag supporting plate, the front bag pusher can push the empty bag stack on the cache position to the first bag picking position, and the rear bag pusher can push the empty bag stack on the second bag picking position to the cache position.

[0005] The rear bag pusher is a cylinder structure with a cylinder rod arranged upward, and the front bag pusher is a cylinder structure with a cylinder rod arranged upward.

[0006] A bag blocking plate is provided at the front end of the first bag taking position, and the lower end of the bag blocking plate is connected to the bag supporting plate.

[0007] A bag blocking mechanism capable of vertical lifting is provided between the second bag taking position and the buffering position, and the bag blocking mechanism is connected to an external frame.

[0008] The bag blocking mechanism includes a vertically arranged hanger, the upper end of which is connected to an external frame, the lower part of which is hinged to the cylinder body of a bag blocking cylinder, the cylinder rod of the bag blocking cylinder is hinged to the upper end of a vertically arranged blocking rod, and the bag blocking cylinder drives the blocking rod to rise and fall vertically.

[0009] The present invention also provides a double-station high-speed bag supply method, which comprises the following steps: S1 Arrange the empty bag stack: Start the bag storage pushing mechanism to push the empty bag stack placed on the bag storage position to the second bag picking position, the rear bag pusher rises vertically and is located behind the second bag picking position, the bag pusher cylinder drives the rear bag pusher to move longitudinally to push the empty bag stack on the second bag picking position to the buffer position, and the rear bag pusher returns to the initial position. At this time, the bag storage pushing mechanism synchronously pushes the empty bag stack placed on the bag storage position to the second bag picking position, the rear bag pusher and the front bag pusher both rise vertically, the bag pusher cylinder drives the rear bag pusher and the front bag pusher to move longitudinally, so that the front bag pusher pushes the empty bag stack on the buffer position to the first bag picking position, and at the same time, the rear bag pusher pushes the remaining empty bag stacks on the second bag picking position to the buffer position and returns to the initial position again, and at this time, the bag storage pushing mechanism synchronously pushes the empty bag stack placed on the bag storage position to the second bag picking position, so that the first bag picking position, the buffer position and the second bag picking position are automatically arranged with empty bag stacks; S2 double-station bag supply: the bag taking mechanism above the first bag taking position and the second bag taking position simultaneously descends to absorb the empty bags on the empty bag pile below and moves them to the left, so that the bag opening mechanism simultaneously rises vertically to absorb the bag opening of the empty bag and then returns to the initial position to open the bag opening. The swing arm bagging mechanism simultaneously inserts into the bag opening of the empty bag and tightens the bag opening and then swings upward to bag; S3 replenishes empty bags to the bag taking position: according to the bag shortage situation of different bag taking positions, the following methods of replenishing empty bags are adopted; S3-A: When there is no empty bag on the second bag taking position, and the first bag taking position and the second bag taking position in the S2 double-station bag supply are simultaneously performing the empty bag bagging action, the bag storage pushing mechanism pushes the empty bag stack placed on the bag storage position to the second bag taking position, and then continues to perform the S2 double-station bag supply action; S3-B: When there is no empty bag on the first bag taking position, and the first bag taking position and the second bag taking position in the S2 double-station bag supply are simultaneously performing the empty bag bagging action, the rear bag pusher and the front bag pusher both rise vertically, and the bag pushing cylinder drives the rear bag pusher and the front bag pusher to move longitudinally, so that the front bag pusher pushes the empty bag stack on the buffer position to the first bag taking position, and at the same time, the rear bag pusher pushes the remaining empty bag stack on the second bag taking position to the buffer position and then returns to the initial position. At this time, the bag storage pushing mechanism synchronously pushes the empty bag stack placed on the bag storage position to the second bag taking position, and continues to perform the double-station bag supply action; S3-C: When there are no empty bags at both the first bag picking position and the second bag picking position, the front bag pusher rises vertically, and the bag pushing cylinder drives the front bag pusher to move longitudinally to push the empty bag stack on the buffer position to the first bag picking position. At this time, the bag storage pushing mechanism synchronously pushes the empty bag stack placed on the bag storage position to the second bag picking position, and executes the S2 double-station bag supply action. When the first bag picking position and the second bag picking position are simultaneously performing the empty bag bagging action, the rear bag pusher rises vertically, and the bag pushing cylinder drives the rear bag pusher to move longitudinally to push the remaining empty bag stack on the second bag picking position to the buffer position, and the rear bag pusher returns to the initial position. At this time, the bag storage pushing mechanism synchronously pushes the empty bag stack placed on the bag storage position to the second bag picking position, and continues to execute the S2 double-station bag supply action.

[0010] The beneficial effects of the present invention are: A. By utilizing the buffer position and two bag taking positions set at the front of the bag support plate, the empty bag stack is pushed to the second bag taking position through the bag storage pushing mechanism, and the empty bag stack on the second bag taking position is pushed to the first bag taking position or the buffer position in cooperation with the bag pushing mechanism, so that the two bag taking positions on a bag support plate can continuously and stably supply bags. The overall layout is compact and occupies little space. Through the coordination and cooperation of various mechanisms, the overall packaging efficiency is improved.

[0011] B. By utilizing the cooperation of the rear bag pusher and the front bag pusher on the bag pushing mechanism, a single or double stack of empty bags can be transferred at one time, and further, when there is a shortage of bags at the first bag taking position and / or the second bag taking position, the corresponding empty bag stack can be promptly supplemented in the gap between the empty bag bagging actions, so as not to affect the bag supply rhythm, and achieve the most efficient packaging speed as a whole.

[0012] C. By using a bag blocking plate at the front end of the first bag taking position and a vertically liftable bag blocking mechanism between the second bag taking position and the buffer position, the two groups of bag taking mechanisms can simultaneously keep the stack shape unchanged and without deformation during the process of sucking empty bags at the two bag taking positions, thereby improving the success rate of bag taking and bag opening, and further improving the reliability of the bag supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional isometric view of the present invention.

[0014] Figure 2It is the front view of the present invention.

[0015] Figure 3 It is a structural schematic diagram of a bag pushing mechanism and a bag storage pushing mechanism.

[0016] Figure 4 It is a structural schematic diagram of the bag pushing mechanism.

[0017] Figure 5 It is a structural schematic diagram of the bag blocking mechanism.

[0018] Figure 6 It is a schematic diagram of the state in which the bag pushing mechanism is ready to push the empty bag stack placed at the second bag taking position to the buffer position.

[0019] Figure 7 It is a schematic diagram of the state in which the bag pushing mechanism has pushed the empty bag stack placed at the second bag taking position to the buffer position.

[0020] Figure 8 It is a schematic diagram of the state in which both the bag taking position and the buffer position are arranged with empty bag stacks. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and beneficial effects of the present invention more clear, embodiments of the present invention are described in detail below with reference to the accompanying drawings. The embodiments are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0022] See also Figure 1 to Figure 5 A double-station bag supply device comprises a base frame 1, a bag holding plate 2 arranged longitudinally and horizontally is provided at the upper end of the base frame 1, a first bag taking position 5, a buffer position 6, and a second bag taking position 7 are sequentially provided at the front upper end of the bag holding plate 2 in the longitudinal direction, a bag taking mechanism 3B which can move up and down and left and right is provided above the first bag taking position 5 and the second bag taking position 7, a bag opening mechanism 3 which can be lifted vertically is provided on the left side below the bag taking mechanism 3B, the bag opening mechanism 3 is connected to the base frame 1, a swing arm bagging mechanism 3A is provided above the bag opening mechanism 3, the swing arm bagging mechanism 3A and the bag taking mechanism 3B are both connected to an external frame, a bag pushing mechanism 8 which can move longitudinally and horizontally between the second bag taking position 7 and the first bag taking position 5 is provided at the lower end of the bag holding plate 2, and the bag pushing mechanism 8 A rear bag pusher 81 which can be lifted and lowered vertically is provided on the bag support plate 2. The rear bag pusher 81 can be raised to above the horizontal end surface of the bag support plate 2 or lowered to below the horizontal end surface of the bag support plate 2. When the rear bag pusher 81 is raised to above the horizontal end surface of the bag support plate 2, the empty bag stack on the second bag taking position 7 can be pushed to the buffer position 6 or the first bag taking position 5, and the empty bag stack on the buffer position 6 can be pushed to the first bag taking position 5. A bag storage pushing mechanism 9 is provided behind the second bag taking position 7. A plurality of groups of pushing plates 93 are evenly arranged on the bag storage pushing mechanism 9. The spacing between the two groups of pushing plates 93 matches the width of the empty bag B. The pushing plates 93 divide the bag support plate 2 into a plurality of bag storage positions A in the longitudinal direction. The bag storage pushing mechanism 9 can horizontally push the empty bag stack arranged on the bag storage position A to the second bag taking position 7.

[0023] Furthermore, the bag storage position A can be set as needed, by manually placing the empty bag stack at the bag storage position A, and the bag taking mechanism 3B and the bag opening mechanism 3 are both provided with a suction cup structure.

[0024] Preferably, the bag storage pushing mechanism 9 includes a transmission chain 92 arranged longitudinally and horizontally, and multiple groups of pushing plates 93 are evenly arranged on the transmission chain 92. The transmission chain 92 is driven by a transmission motor 91 to realize the longitudinal horizontal movement of the pushing plate 93 above the plane of the bag holding plate 2. The transmission motor 91 is connected to the base frame 1.

[0025] Furthermore, the bag pushing mechanism 8 includes a bag pushing trolley 82, a rear bag pusher 81 is provided at the rear end of the bag pushing trolley 82, and a front bag pusher 85 is provided in front of the rear bag pusher 81. The spacing between the front bag pusher 85 and the rear bag pusher 81 matches the width of the empty bag B. The front bag pusher 85 can be raised to above the horizontal end surface of the bag supporting plate 2 or lowered to below the horizontal end surface of the bag supporting plate 2. The bag pushing trolley 82 is hinged to the cylinder rod of the bag pushing cylinder 83, and the cylinder body of the bag pushing cylinder 83 is hinged to the lower end of the base frame 1. The bag pushing cylinder 83 drives the rear bag pusher 81 and the front bag pusher 85 to move along the longitudinally horizontally arranged guide mechanism 84 to realize the bag pushing action. When the front bag pusher 85 and the rear bag pusher 81 are both raised to above the horizontal end surface of the bag supporting plate 2, the front bag pusher 85 can push the empty bag stack on the cache position 6 to the first bag picking position 5, and the rear bag pusher 81 can push the empty bag stack on the second bag picking position 7 to the cache position 6.

[0026] Preferably, the rear bag pusher 81 is a cylinder structure with a cylinder rod arranged upward, and the front bag pusher 85 is a cylinder structure with a cylinder rod arranged upward.

[0027] Furthermore, a bag blocking plate 10 is provided at the front end of the first bag taking position 5 , and the lower end of the bag blocking plate 10 is connected to the bag holding plate 2 .

[0028] Furthermore, a bag blocking mechanism 4 that can be lifted and lowered vertically is provided between the second bag taking position 7 and the buffer position 6, and the bag blocking mechanism 4 is connected to an external frame.

[0029] Preferably, the bag blocking mechanism 4 includes a vertically arranged hanger 41, the upper end of the hanger 41 is connected to an external frame, the lower part of the hanger 41 is hinged to the cylinder body of the bag blocking cylinder 42, the cylinder rod of the bag blocking cylinder 42 is hinged to the upper end of the vertically arranged blocking rod 43, and the bag blocking cylinder 42 drives the blocking rod 43 to rise and fall vertically.

[0030] See also Figures 1 to 8 , describing a preferred double-station high-speed bag supply method of this embodiment, which includes the following steps: S1 Arrange the empty bag stack: Start the bag storage and pushing mechanism 9 to push the empty bag stack placed on the bag storage position A to the second bag taking position 7, the rear bag pusher 81 rises vertically and is located behind the second bag taking position 7, the bag pushing cylinder 83 drives the rear bag pusher 81 to move longitudinally to push the empty bag stack on the second bag taking position 7 to the buffer position 6, and the rear bag pusher 81 returns to the initial position. At this time, the bag storage and pushing mechanism 9 synchronously pushes the empty bag stack placed on the bag storage position A to the second bag taking position 7, and the rear bag pusher 81 and the front bag pusher 85 both rise vertically. The bag pushing cylinder 83 drives the rear bag pushing device 81 and the front bag pushing device 85 to move longitudinally, so that the front bag pushing device 85 pushes the empty bag stack on the buffer position 6 to the first bag taking position 5, and at the same time, the rear bag pushing device 81 pushes the remaining empty bag stack on the second bag taking position 7 to the buffer position 6 and then returns to the initial position again, and at this time, the bag storage pushing mechanism 9 synchronously pushes the empty bag stack placed on the bag storage position A to the second bag taking position 7, so that the first bag taking position 5, the buffer position 6 and the second bag taking position 7 are automatically arranged. S2 Double-station bag supply: The bag taking mechanism 3B above the first bag taking position 5 and the second bag taking position 7 simultaneously descends to absorb the empty bag B on the empty bag pile below and moves it to the left, so that the bag opening mechanism 3 simultaneously rises vertically to absorb the bag opening of the empty bag B and then returns to the initial position to open the bag opening, and the swing arm bagging mechanism 3A simultaneously inserts the bag opening of the empty bag B and tightens the bag opening and then swings upward to bag; S3 replenishes empty bags to the bag taking position: according to the bag shortage situation of different bag taking positions, the following methods of replenishing empty bags are adopted; S3-A: When there is no empty bag B on the second bag taking position 7, and the first bag taking position 5 and the second bag taking position 7 in the S2 double-station bag supply are simultaneously performing the bagging action of the empty bag B, the bag storage pushing mechanism 9 pushes the empty bag stack placed on the bag storage position A to the second bag taking position 7, and then continues to perform the S2 double-station bag supply action; S3-B: When there is no empty bag B on the first bag taking position 5, and the first bag taking position 5 and the second bag taking position 7 in the S2 double-station bag supply are simultaneously performing the empty bag B bagging action, the rear bag pusher 81 and the front bag pusher 85 both rise vertically, and the bag pushing cylinder 83 drives the rear bag pusher 81 and the front bag pusher 85 to move longitudinally, so that the front bag pusher 85 pushes the empty bag stack on the buffer position 6 to the first bag taking position 5, and at the same time, the rear bag pusher 81 pushes the remaining empty bag stack on the second bag taking position 7 to the buffer position 6 and then returns to the initial position. At this time, the bag storage pushing mechanism 9 synchronously pushes the empty bag stack placed on the bag storage position A to the second bag taking position 7, and continues to execute the S2 double-station bag supply action; S3-C: When there are no empty bags B on the first bag taking position 5 and the second bag taking position 7 at the same time, the front bag pusher 85 rises vertically, and the bag pushing cylinder 83 drives the front bag pusher 85 to move longitudinally to push the empty bag stack on the buffer position 6 to the first bag taking position 5. At this time, the bag storage pushing mechanism 9 synchronously pushes the empty bag stack placed on the bag storage position A to the second bag taking position 7, and executes the S2 double-station bag supply action. When the first bag taking position 5 and the second bag taking position 7 are simultaneously performing the empty bag B bagging action, the rear bag pusher 81 rises vertically, and the bag pushing cylinder 83 drives the rear bag pusher 81 to move longitudinally to push the remaining empty bag stack on the second bag taking position 7 to the buffer position 6, and the rear bag pusher 81 returns to the initial position. At this time, the bag storage pushing mechanism 9 synchronously pushes the empty bag stack placed on the bag storage position A to the second bag taking position 7, and continues to execute the S2 double-station bag supply action.

Claims

1. A double-station bag supply device, comprising a base frame (1), the upper end of which is provided with a bag supporting plate (2) arranged longitudinally and horizontally, characterized in that: The front upper end of the bag holding plate (2) is provided with a first bag taking position (5), a buffer position (6), and a second bag taking position (7) in sequence along the longitudinal direction. A bag taking mechanism (3B) that can move up and down, left and right is provided above the first bag taking position (5) and the second bag taking position (7), respectively. A bag opening mechanism (3) that can be lifted vertically is provided on the left side below the bag taking mechanism (3B). The bag opening mechanism (3) is connected to the bottom frame (1). A swing arm bagging mechanism (3A) is provided above the bag opening mechanism (3). Both the swing arm bagging mechanism (3A) and the bag taking mechanism (3B) are connected to an external frame. A bag pushing mechanism (8) that can move longitudinally and horizontally between the second bag taking position (7) and the first bag taking position (5) is provided at the lower end of the bag holding plate (2). A rear bag pushing device (81) that can be lifted vertically is provided on the bag pushing mechanism (8). The device (81) can be raised to above the horizontal end surface of the bag holding plate (2) or lowered to below the horizontal end surface of the bag holding plate (2). When the rear bag pusher (81) is raised to above the horizontal end surface of the bag holding plate (2), it can push the empty bag stack on the second bag taking position (7) to the buffer position (6) or the first bag taking position (5), and can push the empty bag stack on the buffer position (6) to the first bag taking position (5). A bag storage pushing mechanism (9) is arranged behind the second bag taking position (7). A plurality of groups of pushing plates (93) are evenly arranged on the bag storage pushing mechanism (9). The spacing between the two groups of pushing plates (93) matches the width of the empty bag (B). The pushing plates (93) divide the bag holding plate (2) into a plurality of bag storage positions (A) in the longitudinal direction. The bag storage pushing mechanism (9) can horizontally push the empty bag stack arranged on the bag storage position (A) to the second bag taking position (7).

2. A double-station bag supply device according to claim 1, characterized in that: The bag pushing mechanism (8) comprises a bag pushing trolley (82), a rear bag pushing device (81) is provided at the rear end of the bag pushing trolley (82), a front bag pushing device (85) is provided in front of the rear bag pushing device (81), the distance between the front bag pushing device (85) and the rear bag pushing device (81) matches the width of the empty bag (B), the front bag pushing device (85) can be raised to above the horizontal end surface of the bag supporting plate (2) or lowered to below the horizontal end surface of the bag supporting plate (2), the bag pushing trolley (82) is hinged to the cylinder rod of the bag pushing cylinder (83), and the bag pushing cylinder (83) is hinged to the cylinder rod of the bag pushing cylinder (83). ) is hinged at the lower end of the base frame (1), and the bag pushing cylinder (83) drives the rear bag pusher (81) and the front bag pusher (85) to move along the longitudinally horizontally arranged guide mechanism (84) to realize the bag pushing action. When the front bag pusher (85) and the rear bag pusher (81) are both raised above the horizontal end surface of the bag supporting plate (2), the front bag pusher (85) can push the empty bag stack on the buffer position (6) to the first bag taking position (5), and the rear bag pusher (81) can push the empty bag stack on the second bag taking position (7) to the buffer position (6).

3. A double-station bag supply device according to claim 2, characterized in that: The rear bag pusher (81) is a cylinder structure with a cylinder rod arranged upward, and the front bag pusher (85) is a cylinder structure with a cylinder rod arranged upward.

4. A double-station bag supply device according to claim 1, characterized in that: A bag blocking plate (10) is provided at the front end of the first bag taking position (5), and the lower end of the bag blocking plate (10) is connected to the bag holding plate (2). A bag blocking mechanism (4) that can be vertically raised and lowered is provided between the second bag taking position (7) and the buffer position (6), and the bag blocking mechanism (4) is connected to an external frame.

5. A double-station bag supply device according to claim 4, characterized in that: The bag blocking mechanism (4) comprises a vertically arranged hanger (41), the upper end of the hanger (41) is connected to an external frame, the lower part of the hanger (41) is hinged to the cylinder body of the bag blocking cylinder (42), the cylinder rod of the bag blocking cylinder (42) is hinged to the upper end of the vertically arranged blocking rod (43), and the bag blocking cylinder (42) drives the blocking rod (43) to vertically rise and fall.

6. A double-station high-speed bag supply method, comprising the following steps: S1 Arrange the empty bag stack: Start the bag storage and pushing mechanism (9) to push the empty bag stack placed on the bag storage position (A) to the second bag taking position (7), the rear bag pusher (81) rises vertically and is located behind the second bag taking position (7), the bag pushing cylinder (83) drives the rear bag pusher (81) to move longitudinally to push the empty bag stack on the second bag taking position (7) to the buffer position (6), and then the rear bag pusher (81) returns to the initial position. At this time, the bag storage and pushing mechanism (9) synchronously pushes the empty bag stack placed on the bag storage position (A) to the second bag taking position (7), and the rear bag pusher (81) and the front bag pusher (85) are both vertically moved. The bag pusher (83) drives the rear bag pusher (81) and the front bag pusher (85) to move longitudinally, so that the front bag pusher 85 pushes the empty bag stack on the buffer position (6) to the first bag taking position (5), and at the same time, the rear bag pusher (81) pushes the remaining empty bag stack on the second bag taking position (7) to the buffer position (6) and then returns to the initial position again. At this time, the bag storage pushing mechanism (9) synchronously pushes the empty bag stack placed on the bag storage position (A) to the second bag taking position (7). At this point, the empty bag stacks are automatically arranged on the first bag taking position (5), the buffer position (6) and the second bag taking position (7); S2 double-station bag supply: the bag taking mechanism (3B) above the first bag taking position (5) and the second bag taking position (7) simultaneously descends to absorb the empty bag (B) on the empty bag pile below and moves it to the left, so that the bag opening mechanism (3) simultaneously rises vertically to absorb the bag opening of the empty bag (B) and then returns to the initial position to open the bag opening, and the swing arm bagging mechanism (3A) simultaneously inserts the bag opening of the empty bag (B) and tightens the bag opening and then swings the bag upward; S3 replenishes empty bags to the bag taking position: according to the bag shortage situation of different bag taking positions, the following methods of replenishing empty bags are adopted; S3-A: When there is no empty bag (B) on the second bag taking position (7), the first bag taking position (5) and the second bag taking position (7) in the S2 double-station bag supply are simultaneously performing the empty bag (B) bagging action, the bag storage and pushing mechanism (9) pushes the empty bag stack placed on the bag storage position (A) to the second bag taking position (7), and then continues to perform the S2 double-station bag supply action; S3-B: When there is no empty bag (B) on the first bag taking position (5), the first bag taking position (5) and the second bag taking position (7) in the S2 double-station bag supply are simultaneously performing the empty bag (B) bagging action, the rear bag pusher (81) and the front bag pusher (85) both rise vertically, and the bag pushing cylinder (83) drives the rear bag pusher (81) and the front bag pusher (85) to move longitudinally, so that the front bag pusher (85) pushes the empty bag stack on the buffer position (6) to the first bag taking position (5), and at the same time, the rear bag pusher (81) pushes the remaining empty bag stack on the second bag taking position (7) to the buffer position (6) and then returns to the initial position. At this time, the bag storage pushing mechanism (9) synchronously pushes the empty bag stack placed on the bag storage position (A) to the second bag taking position (7), and continues to perform the S2 double-station bag supply action; S3-C: When there are no empty bags (B) on both the first bag taking position (5) and the second bag taking position (7), the front bag pusher (85) rises vertically, and the bag pushing cylinder (83) drives the front bag pusher (85) to move longitudinally to push the empty bag stack on the buffer position (6) to the first bag taking position (5). At this time, the bag storage pushing mechanism (9) synchronously pushes the empty bag stack placed on the bag storage position (A) to the second bag taking position (7), and then executes the S2 double-station bag supply action, and the empty bag stack on the first bag taking position (5) is pushed to the second bag taking position (7). When the empty bag (B) is being bagged at the second bag taking position (7), the rear bag pusher (81) rises vertically, and the bag pushing cylinder (83) drives the rear bag pusher (81) to move longitudinally to push the remaining empty bag stack on the second bag taking position (7) to the buffer position (6), and then the rear bag pusher (81) returns to the initial position. At this time, the bag storage pushing mechanism (9) synchronously pushes the empty bag stack placed on the bag storage position (A) to the second bag taking position (7), and continues to execute the S2 double-station bag supply action.

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