Bag-in-bag packaging machine inner bag transfer into outer bag device

Abstract

The utility model discloses a kind of inner bag transfer into outer bag device of bag-in-bag packaging machine, belong to packaging equipment technical field.This device is connected between material into inner bag automatic packaging equipment and inner bag into outer bag automatic packaging equipment, including rack, inner bag finished product transfer manipulator and inner bag finished product clamping transfer poking mechanism, inner bag finished product clamping transfer poking mechanism is rotated by servo motor driven rotary plate, realizes clamping plate automatic opening and closing by the track cooperation of cam bearing and cam groove, while additionally independent temporary clamping drive component, can actively compress inner bag volume, cooperate the poking component of roof layout to complete inner bag automatic poking and pack into bag.The utility model solves the problem that existing equipment cannot adapt to inner and outer bag near size packaging condition, can only rely on artificial compression filling inner bag, realize the automation continuous packaging of bag-in-bag, adapt to promotional gifts, activity coupon supporting packaging scene.

Description

Technical Field

[0001] This utility model belongs to the field of packaging equipment technology, specifically relating to a device for transferring the inner bag into the outer bag in a bag-in-bag packaging machine. Background Technology

[0002] The bag-in-bag double-layer packaging structure, with its excellent moisture-proof, dust-proof, and impact-resistant sealing performance, is widely used in the packaging production of various commodities such as food, daily chemicals, cultural and creative gifts, and health products. The conventional bag-in-bag packaging process involves first filling the material into small inner bags to complete the inner packaging, and then placing multiple sets of small inner bags into a larger outer bag to achieve double-layer protective packaging. Existing automated packaging equipment adapted to this process is designed only for situations where there is a significant difference in size between the inner and outer bags. The larger outer bag can easily accommodate multiple smaller inner bags, completing automatic filling without volume compression, enabling fully automated production line operations.

[0003] With the upgrading of product promotion models, existing packaging conditions have changed significantly. To accommodate promotional coupons, gift cards, sample accessories, and other auxiliary materials, the industry generally adopts a single-bag independent secondary packaging model, where a single inner bag is placed inside an outer bag. At the same time, in order to control packaging material costs and reduce the overall product packaging volume, the current outer bag and the inner bag after filling are very close in size, with a very small gap between the inner and outer bags. Conventional uncompressed inner bags cannot be directly inserted into the outer bag.

[0004] Existing traditional bag-in-bag packaging equipment lacks a suitable adaptive compression and precise transfer filling mechanism for the inner bag, making it unsuitable for packaging situations involving similarly sized inner and outer bags. Currently, the industry relies solely on manual assistance: the operator manually grasps the filled inner bag, manually compresses its overall volume, and then forcibly inserts the compressed inner bag into the outer bag to complete the secondary packaging. This manual assistance mode has several substantial drawbacks: First, it has extremely poor automation adaptability, cannot be integrated with automated production lines, and the limited speed of manual operation severely restricts the production efficiency of the entire production line, failing to meet the needs of mass production. Second, the manual compression force and filling angle rely entirely on subjective experience, leading to frequent problems such as uneven force and misalignment, easily causing outer bag wrinkles and deformation, inner bag filling misalignment, and poor double-layer sealing, resulting in poor product packaging consistency and a high defect rate. Third, long-term manual operation is labor-intensive, significantly increasing labor and management costs, greatly raising the cost of mass production. Fourth, manual operation is prone to human errors such as missed fillings, incorrect fillings, and missing promotional items, making it impossible to guarantee product quality stability.

[0005] In summary, existing bag-in-bag packaging equipment suffers from poor adaptability to working conditions and lacks the technical shortcomings of automatic compression and filling of inner bags of similar size. There is an urgent need to develop a dedicated inner bag to outer bag transfer device to achieve automated compression, transfer, and filling of inner and outer bags of similar size, thereby replacing manual operation and solving many of the defects of existing technology. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and solve the technical problems of existing bag-in-bag packaging equipment being unable to adapt to packaging conditions where the inner and outer bags are close in size, requiring manual compression and filling of the inner bag into the outer bag, resulting in low automation, low production efficiency, poor packaging accuracy, weak product consistency, and high production costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an inner bag transfer device for a bag-in-bag packaging machine. The device is located between the automatic inner bag packaging equipment and the automatic inner bag to outer bag packaging equipment, connecting the two automated packaging processes to achieve automated transfer, compression, and precise filling of the finished inner bag. This device mainly includes a frame, on which are mounted an inner bag finished product transfer robot and an inner bag finished product clamping and transfer material-filling mechanism. Relying on the cooperation of these two structures, it completes the automated packaging of near-sized inner and outer bags, replacing traditional manual compression and filling operations.

[0008] The inner bag finished product clamping and transferring material feeding mechanism is the core operating mechanism of this device, specifically including a servo motor, a feeding assembly, a base plate, a cam groove plate, a rotating plate, and a top plate. The base plate is fixedly mounted on the frame, and the cam groove plate is fixedly installed on the upper surface of the base plate. The cam groove plate has a cam groove inside that allows for the rolling displacement of the cam bearing. The servo motor is fixed to the lower surface of the base plate, and the servo motor shaft passes through the base plate and is fixedly connected to the rotating plate, enabling precise rotation of the rotating plate. The top plate is supported above the base plate by support columns, the feeding assembly is mounted on the top plate, and the rotating plate is rotatably arranged between the top plate and the base plate.

[0009] Several sets of clamping plate assemblies are evenly assembled on the outer circumference of the rotating plate. Each clamping plate assembly includes a clamping plate and a cam bearing. The cam bearing is rolled and limited inside the cam groove of the cam groove plate, and can roll and move along the preset trajectory of the cam groove as the rotating plate rotates, thereby driving the clamping plate to complete the automatic opening and closing action at the corresponding work position. The clamping plate assembly is also equipped with guide rails, guide slots, guide blocks, limit bearings, left swing arms, and right swing arms. The guide rails are arranged on the peripheral wall of the rotating plate, and the clamping plates are slidably assembled on the guide rails. The guide slots are opened on the rotating plate, and the guide blocks are slidably assembled inside the guide slots. The lower end of the guide blocks is connected to the cam bearing, and the upper end of the guide blocks is provided with a convex shaft with a limit bearing. The left and right swing arms are rotatably assembled on the rotating plate, and the end limit slots are sleeved on the outside of the limit bearings. The other end of the swing arms is connected to the clamping plates. During the displacement of the cam bearing, the clamping plates can be driven to slide along the guide rails through the linkage of the guide blocks, limit bearings, and left and right swing arms to achieve stable opening and closing actions.

[0010] Specifically, the clamping plate includes symmetrically arranged left and right clamping plates. V-shaped clamping grooves are formed on the opposite end faces of both the left and right clamping plates, allowing for adaptive fitting and positioning of the inner bag, ensuring stable clamping and minimizing damage to the bag. Simultaneously, tension springs connect the left and right clamping plates of adjacent clamping plate assemblies. Under normal conditions without external force, the tension springs stably drive the clamping plate assemblies to remain open, ensuring the receiving station can properly receive the finished inner bag.

[0011] The base plate is also equipped with a temporary clamping drive assembly. Unlike the passive opening and closing structure of the cam trajectory, the temporary clamping drive assembly can actively output driving force to assist the clamping plate in quickly closing and compressing the volume of the expanded inner bag after filling with materials. This makes the inner bag size suitable for the close-size assembly of the inner and outer bags, meeting the requirements of automatic filling. The temporary clamping drive assembly specifically includes a return swing arm, a retraction swing arm, a vertical shaft, a cylinder swing arm, and a drive cylinder. One end of the return swing arm is rotatably mounted on the base plate, and the other end has a transmission groove. The pivot shaft at one end of the retraction swing arm is slidably mounted in the transmission groove. The retraction swing arm is connected to the cylinder swing arm through the vertical shaft. The drive cylinder is hinged to the bottom of the base plate. The active closing and compression action of the clamping plate is achieved through multi-stage transmission.

[0012] The material feeding assembly mounted on the top plate includes a vertical linear motion module and a material feeding rod. The vertical linear motion module is vertically fixed to the upper surface of the top plate, and the material feeding rod is mounted on the module slide, which can perform vertical reciprocating motion with the slide to accurately push the compressed inner bag into the outer bag at the bag feeding station. In addition, the cam groove plate has an integrally formed cam groove with interconnected raised channels and arc-shaped guide channels. The raised channels correspond to the material receiving station and cooperate to open the clamping plate to receive the material; the arc-shaped guide channels correspond to the bag feeding station, restrict the displacement of the cam bearing, maintain the clamping state of the clamping plate, and ensure that the inner bag volume is stable and there is no rebound or loosening during the transfer process.

[0013] This invention achieves passive opening and closing of the clamping plate through the trajectory cooperation of the cam groove and the cam bearing. Combined with the normal opening and resetting structure of the tension spring, the active compression structure of the temporary clamping drive component, and the precise material feeding structure of the feeding component, a complete automated operation system is formed, effectively solving the technical pain point of existing near-size bag-in-bag packaging that relies on manual operation.

[0014] Technical effects of this utility model: 1. This utility model innovatively sets up a dual-cooperation mode of cam trajectory linkage opening and closing structure + independent temporary clamping active compression structure, breaking through the limitation of traditional bag-in-bag equipment that can only adapt to packaging of large-gap inner and outer bags. It can independently and precisely compress the volume of the bulky inner bag, perfectly adapting to special packaging conditions where the inner and outer bags are close in size. It is also suitable for customized packaging scenarios for promotional gifts and activity coupons, greatly expanding the scope of application of the equipment and possessing outstanding creativity and practicality.

[0015] 2. This utility model adopts a rotating multi-group clamping plate circulating operation structure, which connects the fully automatic production line action of precise feeding by robotic arms, active compression by cylinders, and precise material insertion by modules. The workstations are connected smoothly and the operation rhythm is uniform and stable, completely replacing manual auxiliary operation, greatly improving the automation level and production efficiency of bag-in-bag packaging, and meeting the needs of large-scale, continuous production.

[0016] 3. This utility model uses a mechanical structure to precisely control the clamping and opening range, the inner bag compression volume, the material feeding stroke, and the alignment accuracy. Compared with manual operation, it completely solves the problems of uneven manual force, alignment deviation, and poor packaging consistency. It effectively avoids problems such as outer bag deformation, inner bag displacement, and poor sealing, and greatly improves product packaging quality and yield.

[0017] 4. This utility model features fully mechanized and automated operation, eliminating the need for manual intervention and significantly reducing labor intensity and mass production labor costs. The equipment can be directly connected to existing bag-in-bag automated production lines, making it easy to modify, highly adaptable, and stable in operation, thus possessing extremely high market promotion value.

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0019] Figure 1 This is a perspective view of the usage state of a specific embodiment of this utility model; Figure 2 A three-dimensional view of the inner bag finished product clamping, transfer, and material feeding mechanism; Figure 3 This is a cross-sectional view of the inner bag finished product clamping and transferring material feeding mechanism; Figure 4 A partial structural section of the inner bag finished product clamping and transfer material feeding mechanism. Figure 1 ; Figure 5 A partial structural section of the inner bag finished product clamping and transfer material feeding mechanism. Figure 2 ; Figure 6 A partial structural section of the inner bag finished product clamping and transfer material feeding mechanism. Figure 3 .

[0020] Explanation of reference numerals in the attached drawings: 1. Servo motor; 2. Base plate; 3. Cam groove plate; 4. Rotating plate; 5. Top plate; 6. Return swing arm; 7. Retracting swing arm; 8. Vertical axis; 9. Cylinder swing arm; 10. Drive cylinder; 11. Vertical linear motion module; 12. Material feeding rod; 13. Clamping plate assembly; 14. Left clamping plate; 15. Right clamping plate; 16. Left swing arm; 17. Right swing arm; 18. Temporary clamping drive assembly; 19. Inner bag finished product transfer robot; 20. Inner bag finished product clamping and transfer material feeding mechanism; 21. Protruding channel; 22. Arc-shaped guide channel; 23. Guide rail; 24. Guide groove; 25. Guide block; 26. Cam bearing; 27. Limit bearing; 28. Frame; 29. ​​Automatic packaging equipment for material entering the inner bag; 30. Automatic packaging equipment for material entering the outer bag. Detailed Implementation

[0021] The present invention will be specifically described below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0022] like Figure 1 — Figure 6 As shown, this embodiment discloses an inner bag to outer bag transfer device for a bag-in-bag packaging machine. This device is fixedly installed at the gap between the material-in-inner-bag automatic packaging equipment 29 and the inner bag to outer bag automatic packaging equipment 30, connecting the two packaging processes. It is specifically designed for special working conditions where the inner and outer bags are of similar size and the inner bag needs to be compressed before filling, completing the automatic transfer, compression, and filling of the finished inner bag. The basic supporting component of the device is the frame 28, on which two core components are fixedly mounted: the inner bag finished product transfer robot 19 and the inner bag finished product clamping, transfer, and material-pushing mechanism 20.

[0023] The inner bag finished product clamping and transfer material-pushing mechanism includes a servo motor 1, a material-pushing assembly, a base plate 2, a cam groove plate 3, a rotating plate 4, and a top plate 5. The base plate 2 is horizontally fixed on the frame 28, serving as the fixed base for the entire mechanism. The cam groove plate 3 is tightly fitted and fixed to the upper surface of the base plate 2. The cam groove plate 3 has an annular closed cam groove inside, consisting of an integrally connected raised channel 21 and an arc-shaped guide channel 22. The servo motor 1 is bolted to the lower surface of the base plate 2. The output shaft of the servo motor 1 extends vertically upwards through the surface of the base plate 2, and the top of the shaft is fixedly connected to the center of the rotating plate 4. The servo motor 1 can precisely drive the rotating plate 4 to rotate at a uniform speed and achieve precise positioning, enabling station switching. The top plate 5 is vertically and parallelly mounted above the base plate 2 by four support columns. A rectangular hollow mounting cavity is formed between the top plate 5 and the base plate 2, and the rotating plate 4 is rotatably assembled inside this cavity.

[0024] A material-push assembly is fixedly installed on the upper surface of the top plate 5. The material-push assembly includes a vertical linear motion module 11 and a material-push rod 12. The vertical linear motion module 11 is vertically fixed and the module slide can make precise reciprocating motion in the vertical direction. The material-push rod 12 is fixedly installed on the module slide and rises and falls synchronously with the slide. When it descends, it can accurately push the clamped and fixed inner bag into the lower outer bag.

[0025] Four sets of clamping plate assemblies 13 are evenly distributed around the outer circumference of the rotating plate 4. The four sets of assemblies work alternately and cyclically to improve work efficiency. Each set of clamping plate assemblies 13 includes a symmetrically arranged left clamping plate 14 and a right clamping plate 15. Horizontal guide rails 23 are fixedly installed on the outer wall of the rotating plate 4 corresponding to each set of clamping plate assemblies 13. Slide seats are fixedly mounted at the bottom of the left clamping plate 14 and the right clamping plate 15, and the two sets of slide seats are correspondingly and slidably engaged on the guide rails 23, allowing them to slide horizontally towards and away from each other along the guide rails 23 to achieve the closing and opening of the clamping plates. V-shaped clamping grooves are opened on the inner end faces of the left clamping plate 14 and the right clamping plate 15, which can adaptively wrap the inner bag sidewall, clamping evenly and stably without scratching the bag body and the internal materials.

[0026] A radially penetrating guide groove 24 is formed on the rotating plate 4. A guide block 25 is slidably mounted inside the guide groove 24, and the guide block 25 can slide radially along the guide groove 24. The lower end of the guide block 25 passes through the guide groove 24 and is fixed to a connecting seat. A cam bearing 26 is rotatably mounted at the bottom of the connecting seat. The cam bearing 26 is rolled and engaged inside the cam groove of the cam groove plate 3, and can roll and displace along the cam groove trajectory as the rotating plate 4 rotates. A cam shaft is fixedly welded to the upper end of the guide block 25, and a limit bearing 27 is rotatably mounted on the cam shaft.

[0027] The upper surface of the rotating plate 4 is rotatably equipped with a left swing arm 16 and a right swing arm 17 corresponding to each set of clamping plate assemblies 13. One end of the left swing arm 16 and the right swing arm 17 is respectively provided with a limiting groove. The two limiting grooves are symmetrically sleeved on the left and right sides of the limiting bearing 27. The other end of the left swing arm 16 and the right swing arm 17 are respectively hinged to the slide of the corresponding side clamping plate, forming a complete linkage transmission structure. The left clamping plate 14 and the right clamping plate 15 of two adjacent sets of clamping plate assemblies 13 are connected by a tension spring. When no external force is applied, the tension spring is stretched and reset, continuously driving the clamping plates to keep them in an open state, meeting the material picking requirements of the receiving station.

[0028] A temporary clamping drive assembly 18 is mounted on the lower end face of the base plate 2. The temporary clamping drive assembly 18 includes a return swing arm 6, a retraction swing arm 7, a vertical shaft 8, a cylinder swing arm 9, and a drive cylinder 10. One end of the return swing arm 6 is hinged to the lower end face of the base plate 2, and the other end of the return swing arm 6 has a long strip-shaped transmission groove. One end of the retraction swing arm 7 is fixedly provided with a dial shaft, which slides and engages inside the transmission groove to achieve linkage and limit of the swing arm. The other end of the retraction swing arm 7 is fixedly connected to the top end of the vertical shaft 8. The vertical shaft 8 vertically passes through the cam groove plate 3 and the base plate 2, and the bottom end of the vertical shaft 8 is fixedly connected to one end of the cylinder swing arm 9. The tail of the drive cylinder 10 is hinged to the frame 28 below the base plate 2, and the piston rod end of the drive cylinder 10 is hinged to the other end of the cylinder swing arm 9, providing a power source for the temporary clamping drive action.

[0029] The specific operating procedure for this device is as follows: In the initial standby state, all clamping plate assemblies 13 maintain a stable pre-open state under the elastic action of the tension springs. The servo motor 1 starts and drives the rotating plate 4 to rotate at a uniform speed. When any set of clamping plate assemblies 13 rotates to the receiving position of the material feeding device, the cam bearing 26 rolls precisely to the position of the protruding channel 21 of the cam groove. The guide block 25 moves radially outward of the rotating plate 4 under the action of the trajectory, maintaining the maximum opening state of the clamping plates through the swing arm linkage structure. At this time, the automatic material feeding and packaging equipment 29 completes the material filling operation, and the inner bag finished product transfer robot 19 starts, accurately transferring the finished inner bag and placing it between the V-shaped clamping grooves of the left and right clamping plates.

[0030] After the inner bag is placed, the piston rod of the drive cylinder 10 extends, pushing the cylinder swing arm 9 to swing, which in turn drives the vertical shaft 8 to rotate. The vertical shaft 8 drives the retraction swing arm 7 to rotate synchronously. Under the limiting cooperation of the dial shaft and the transmission groove, the return swing arm 6 swings synchronously, pushing the cam bearing 26 to radially shift towards the center position of the cam groove. Through the linkage transmission of the guide block 25 and the left and right swing arms, the left clamping plate 14 and the right clamping plate 15 are driven to quickly close towards each other, squeezing and shaping the bulky finished inner bag and compressing its volume, so that the size of the inner bag is adapted to the filling gap of the near-specification outer bag.

[0031] After the inner bag is compressed and clamped, the servo motor 1 continues to drive the rotating plate 4 to rotate, causing the cam bearing 26 to disengage from the raised channel 21 and smoothly roll into the arc-shaped guide channel 22 of the cam groove. The narrow structure of the arc-shaped guide channel 22 restricts the radial displacement of the cam bearing 26, so that the clamping plate assembly 13 remains in a clamped and compressed state throughout the process, effectively preventing the inner bag from springing back and loosening during the transfer process, and ensuring the stability of the inner bag volume.

[0032] When the clamping plate assembly 13 holding the compressed inner bag rotates to the bag-infeeding station of the automatic inner bag to outer bag packaging equipment 30, the outer bag is precisely conveyed to the position directly below the material-inserting station. At this time, the vertical linear motion module 11 on the top plate 5 is activated, driving the material-inserting rod 12 to move vertically downward quickly and accurately, smoothly inserting the compressed and shaped finished inner bag into the outer bag. Subsequently, coupons, gift cards, sample accessories, etc., are inserted into the outer bag through the bag-in-bag insertion station, completing the bag-in-bag secondary packaging operation in one go. After the material-inserting is completed, the vertical linear motion module 11 drives the material-inserting rod 12 to move upward and reset, and the rotating plate 4 continues to rotate, entering the next cycle of operation, realizing continuous production on the assembly line.

[0033] This embodiment features a compact structure, clear transmission logic, and precise action connection. It can stably realize automated compression, transfer, and filling operations for near-sized inner and outer bags, as well as for large-sized inner bags into outer bags. The entire process requires no manual intervention, completely solving various defects of existing technologies that require manual assistance, and is suitable for the needs of mass automated production.

Claims

1. A device for transferring an inner bag into an outer bag in a bag-in-bag packaging machine, comprising a frame (28), characterized in that: The frame (28) is equipped with an inner bag finished product transfer robot and an inner bag finished product clamping and transfer feeding mechanism; the inner bag finished product clamping and transfer feeding mechanism includes a servo motor (1), feeding assembly, base plate (2), cam groove plate (3), rotating plate (4) and top plate (5); the cam groove plate (3) is fixed to the upper end face of the base plate (2) and has a cam groove, the servo motor (1) is fixed to the lower end face of the base plate (2), the servo motor (1) shaft passes through the base plate (2) and is fixedly connected to the rotating plate (4); the top plate (5) is mounted on the base plate (2) by a support column. The material feeding assembly is mounted on the top plate (5), and the rotating plate (4) is located between the top plate (5) and the bottom plate (2). Several sets of clamping plate assemblies (13) are evenly mounted on the outer periphery of the rotating plate (4). The clamping plate assembly (13) includes a clamping plate and a cam bearing (26) for controlling the opening and closing of the clamping plate. The cam bearing (26) rolls along the preset trajectory of the cam groove as the rotating plate (4) rotates, providing trajectory constraints for the opening and closing of the clamping plate. The bottom plate (2) is also equipped with a temporary clamping drive assembly (18) for actively assisting the clamping plate to close and compress the volume of the inner bag.

2. The inner bag transfer device for the bag-in-bag packaging machine according to claim 1, characterized in that: The temporary clamping drive assembly (18) includes a return swing arm (6), a retraction swing arm (7), a vertical shaft (8), a cylinder swing arm (9), and a drive cylinder (10). One end of the return swing arm (6) is rotatably mounted on the base plate (2), and the other end of the return swing arm (6) is provided with a long strip-shaped transmission groove. One end of the retraction swing arm (7) is fixed with a slidable shaft in the transmission groove, and the other end of the retraction swing arm (7) is fixedly connected to the upper end of the vertical shaft (8). The vertical shaft (8) passes through the cam groove plate (3) and the base plate (2) from top to bottom, and the lower end of the vertical shaft (8) is fixedly connected to the cylinder swing arm (9). The tail of the drive cylinder (10) is rotatably mounted on the frame below the base plate (2), and the piston rod of the drive cylinder (10) is hinged to the end of the cylinder swing arm (9).

3. The inner bag transfer device for the bag-in-bag packaging machine according to claim 1, characterized in that: The material-push assembly includes a vertical linear motion module (11) and a material-push rod (12). The vertical linear motion module (11) is vertically fixedly mounted on the upper end face of the top plate (5). The material-push rod (12) is fixed on the slide of the vertical linear motion module (11). The material-push rod (12) extends vertically downward and can reciprocate vertically with the slide.

4. The inner bag transfer device for the bag-in-bag packaging machine according to claim 1, characterized in that: The clamping plate assembly (13) further includes a guide rail (23), a guide groove (24), a guide block (25), a limiting bearing (27), a left swing arm (16), and a right swing arm (17); the guide rail (23) is located on the peripheral wall of the rotating plate (4), and the clamping plate is slidably mounted on the guide rail (23). The guide groove (24) is opened on the rotating plate (4), and the guide block (25) is slidably mounted in the guide groove (24). The lower end of the guide block (25) is connected to the cam bearing (26). 5) A convex shaft with a limiting bearing (27) is provided at the upper end. The left swing arm (16) and the right swing arm (17) are rotatably mounted on the rotating plate (4) and the end limiting groove is sleeved on the outside of the limiting bearing (27). The other end of the left swing arm (16) and the right swing arm (17) are connected to the clamping plate. When the cam bearing (26) moves along the cam groove trajectory, the clamping plate is driven to slide along the guide rail (23) through the linkage of the guide block (25), the limiting bearing (27), the left swing arm (16), and the right swing arm (17) to realize the opening and closing action.

5. The inner bag transfer device for the bag-in-bag packaging machine according to claim 1, characterized in that: The clamping plate includes a left clamping plate (14) and a right clamping plate (15) arranged symmetrically. V-shaped clamping grooves for fitting and limiting the inner bag are provided on the opposite end faces of the left clamping plate (14) and the right clamping plate (15).

6. The inner bag transfer device for the bag-in-bag packaging machine according to claim 1, characterized in that: The cam groove of the cam groove plate (3) is integrally formed with a raised channel (21) and an arc-shaped guide channel (22) that are interconnected. The raised channel (21) is set at the material receiving station of the equipment and is used to realize the opening of the clamping plate to receive the material. The arc-shaped guide channel (22) is set at the bag-entry station of the equipment and is used to maintain the clamping state of the clamping plate.

7. The inner bag transfer device for the bag-in-bag packaging machine according to claim 1, characterized in that: A tension spring is connected between the left clamping plate (14) and the right clamping plate (15) of the two adjacent clamping plate assemblies (13). The tension spring normally drives the clamping plate assembly (13) to remain in the open state.

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