A packaging bag clamping mechanism and an unpacking machine having the same

Abstract

The present invention provides a packaging bag clamping mechanism and an unpacking machine having the same, belonging to the technical field of automatic unpacking, including: a moving table, a first blowing member, a spider claw and a first driving member. The moving table is connected to an external mechanism and can move towards the packaging bag. The first blowing member is arranged on the moving table, and the spider claw rotates around a first rotating shaft to extend out of the moving table and insert into the packaging bag. When the present invention clamps the packaging bag, the moving table moves towards the packaging bag, thereby driving the blowing member to insert into the inner bag of the packaging bag. The air outlet end of the blowing member inflates the inner bag, making the surface of the inner bag flat. Then, the first driving member is started to drive the spider claw to clamp the packaging bag. Since the inner bag has been made full before the spider claw clamps, the spider claw can clamp both the inner and outer layers of the packaging bag at the same time, which is more convenient for pouring the materials in the packaging bag.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic unpacking, and particularly relates to a bag clamping mechanism and an unpacking machine having the same. Background Art

[0002] In industries such as food, pharmaceuticals, health products, milk powder, petroleum, and chemical industries, raw materials are often packaged in bags. Among them, the outer layer of the double-layer bag generally uses woven bags, kraft paper bags, composite bags, etc., and the inner layer of the bag generally uses plastic bags.

[0003] At present, the automatic unpacking machines on the market have great limitations. They require the bags to be full and have a unified shape. For some double-layer bags with non-full bags, poor stacking conditions, and very poor material fluidity, since the inner bag and the outer bag are independently packaged, the plastic inner bag is very easy to form wrinkles, and materials will accumulate at the wrinkled places. Therefore, it is very difficult to unpack. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that when the existing automatic unpacking machine unpacks the double-layer bag, it is difficult to unpack due to the wrinkles of the inner bag, so as to provide a bag clamping mechanism and an unpacking machine having the same.

[0005] To solve the above technical problem, the present invention provides a bag clamping mechanism, including: a moving table for moving towards the bag;

[0006] A first blowing member disposed on the moving table, and an air outlet end of the first blowing member can be inserted into the inner bag of the bag as the moving table moves, so as to inflate the inner bag;

[0007] A spider claw installed on the moving table and disposed on a first rotating shaft, and the spider claw rotates around the first rotating shaft to extend out of the moving table and insert into the bag;

[0008] A first driving member, a driving end of which is connected to the spider claw, and the first driving member is used to drive the spider claw to rotate to extend out of or retract into the moving table.

[0009] Optionally, the moving table has two sets of folding plates symmetrically arranged, the spider claws are respectively installed on the two sets of folding plates, and the two sets of folding plates are adapted to be turned relatively away from the bag, and the orientations of the spider claws on the two sets of folding plates are opposite after extending out of the folding plates.

[0010] Optionally, one ends of the two sets of folding plates close to each other are rotatably connected through a second rotating shaft, and the other ends away from each other are respectively slidably installed on the body of the moving table.

[0011] Optionally, a second driving member is installed on the body of the mobile station. The driving end of the second driving member is connected to the second rotating shaft between the two sets of folding plates. The two sets of folding plates are folded and reset by the telescopic driving of the second driving member. Two sets of the second driving members are symmetrically arranged at both ends of the second rotating shaft.

[0012] Optionally, a mounting plate is arranged at the middle position above the body of the mobile station. The second driving member is vertically installed on the mounting plate. A connecting column is installed in the middle of the mounting plate. The connecting column is used to connect with the driving end of the lifting driving member. The mobile station moves towards the packaging bag under the driving of the lifting driving member.

[0013] Optionally, the body of the mobile station is provided with a chute for guiding the sliding of the folding plate. The folding plate is provided with a rolling body for rolling in the chute. A roller mounting seat is detachably installed on the side of the folding plate. The rolling body is rotatably installed on the mounting seat through a bearing, and a part of the rolling body is inserted into the chute.

[0014] Optionally, the first driving member drives the first rotating shaft to rotate forward or backward through linear motion, so that the spider claws extend out of or retract into the mobile station.

[0015] Optionally, there are multiple first rotating shafts arranged side by side, and the multiple first rotating shafts are synchronously connected by a connecting rod.

[0016] Optionally, the top of the spider claw has an outlet for blowing air.

[0017] An unpacking machine includes: a conveyor belt, a cutting knife, and the packaging bag clamping mechanism described in any one of the above solutions. The packaging bag clamping mechanism is arranged above the conveyor belt and is connected to the lifting driving member, and is used to move closer to or away from the conveyor belt direction under the driving of the lifting driving member;

[0018] The cutting knife is arranged below the conveyor belt and has at least a part extending upward out of the conveyor belt, and is used to cut open the packaging bag at the bottom;

[0019] The cutting knife is located upstream of the packaging bag clamping mechanism. After the bottom of the packaging bag is cut open by the cutting knife, the packaging bag is lifted by the packaging bag clamping mechanism so that the materials in the packaging bag are poured out.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. When the packaging bag clamping mechanism provided by the present invention clamps a packaging bag, the moving platform moves towards the packaging bag, driving the blowing member to insert into the inner bag of the packaging bag. The inner bag is inflated through the air outlet end of the blowing member, making the surface of the inner bag flat. Then, the first driving member is activated to drive the spider claws to clamp the packaging bag. Since the inner bag has been made full before the spider claws perform clamping, the spider claws can clamp both the inner and outer layers of the packaging bag simultaneously, making it more convenient to pour the materials inside the packaging bag.

[0022] 2. For the packaging bag clamping mechanism provided by the present invention, the two folding plates are connected to the packaging bag through the spider claws. After being folded towards the direction away from the packaging bag respectively, they can drive the two sides of the packaging bag to fold upwards, improving the fluidity of the materials inside the packaging bag and thus facilitating the feeding.

[0023] 3. For the packaging bag clamping mechanism provided by the present invention, the first driving member can control the rotation of multiple rotating shafts through the connecting rod, enabling the spider claws to extend out of the moving platform and then insert into the packaging bag. The multiple spider claws can improve the stability after clamping.

[0024] 4. For the packaging bag clamping mechanism provided by the present invention, by providing air blowing ports on the spider claws, when they are inserted into the packaging bag, they can blow air into the packaging bag, improving the fluidity of the materials inside the packaging bag, making the feeding more sufficient, and avoiding the remaining of materials in the packaging bag.

[0025] 5. For the unpacking machine provided by the present invention, through the cooperation of the conveyor belt, the cutting knife and the packaging bag clamping mechanism in the above scheme, it is convenient to unpack the double-layer packaging bag, and the materials in the packaging bag can be fully fed, avoiding waste. Brief Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is the front view of the packaging bag clamping mechanism provided in the first embodiment of the present invention;

[0028] Figure 2 For Figure 1 the front view;

[0029] Figure 3 For Figure 1 the left view;

[0030] Figure 4 For Figure 1Schematic diagram of the state after the middle folding plate is folded;

[0031] Figure 5 For Figure 1 Enlarged schematic diagram of area A in the middle;

[0032] Figure 6 It is the top view of the unpacking machine provided in the first embodiment.

[0033] Explanation of reference numerals:

[0034] 1. Mobile platform; 2. First blowing member; 3. Spider claw; 4. First rotating shaft; 5. First driving member; 6. Folding plate; 7. Second rotating shaft; 8. Second driving member; 9. Mounting plate; 10. Connecting column; 11. Chute; 12. Rolling body; 13. Mounting seat; 14. Bearing; 15. Connecting rod; 16. Conveyor belt; 17. Cutting knife. Specific embodiments

[0035] Next, the technical solutions of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Such as Figures 1 to 3As shown, a specific implementation of the packaging bag clamping mechanism provided in this embodiment includes: a moving table 1, a first blowing member 2, a spider claw 3, and a first driving member 5. The moving table 1 is connected to an external mechanism and can move towards the packaging bag. The first blowing member 2 is arranged on the moving table 1, and the air outlet end of the first blowing member 2 can be inserted into the inner bag of the packaging bag for inflation as the moving table 1 moves. The spider claw 3 is installed on the moving table 1 through a first rotating shaft 4, and the spider claw 3 rotates around the first rotating shaft 4 to extend out of the moving table 1 and insert into the packaging bag. The driving end of the first driving member 5 is connected to the spider claw 3 and is used to drive the spider claw 3 to extend or retract from the moving table 1. In this embodiment, the first blowing member 2 can adopt a pulse blowing nozzle, a jet, a blowing gun, etc., as long as its air outlet end is sharp and can be inserted into the packaging bag for inflation. There is a circular hole in the middle of the spider claw 3, and it is sleeved on the first rotating shaft 4 through the circular hole. There is a through hole on the moving table 1 opposite to the spider claw 3. The spider claw 3 passes through the through hole during rotation and then inserts into the packaging bag. The first driving member 5 is a cylinder.

[0040] When the packaging bag clamping mechanism provided in this embodiment clamps the packaging bag, the moving table 1 moves towards the packaging bag, thereby driving the blowing member to be inserted into the inner bag of the packaging bag. The inner bag is inflated through the air outlet end of the blowing member, making the surface of the inner bag flat. Then, the first driving member 5 is started to drive the spider claw 3 to clamp the packaging bag. Since the inner bag has become full before the spider claw 3 clamps, the spider claw 3 can clamp both the inner and outer layers of the packaging bag simultaneously, which is more convenient for pouring the materials in the packaging bag.

[0041] As Figures 1 to 4As shown in the figure, in the bag clamping mechanism provided in this embodiment, the moving platform 1 has two sets of folding plates 6 symmetrically arranged. Spider claws 3 are respectively installed on the two sets of folding plates 6. The folding plates 6 can be relatively folded in a direction away from the bag. The orientations of the spider claws 3 on the two sets of folding plates 6 are opposite after the spider claws 3 extend out of the folding plates 6. Specifically, a first driving member 5 is respectively installed on the two sets of folding plates 6, and the two first driving members 5 are arranged in the opposite direction, and their driving ends are oriented in the opposite direction to achieve the opposite orientations of the spider claws 3. The opposite orientations of the spider claws 3 after extending out of the folding plates 6 can increase the clamping range of the bag, making the bag more stable during movement. The bag is located at the middle position of the moving platform 1. The first rotating shaft 4 is also installed on the folding plate 6. There are L-shaped plates on both sides of the two sets of folding plates 6, and the moving platform 1 is formed by connecting the L-shaped plates and the two sets of folding plates 6. The two sets of folding plates 6 are connected to the bag through the spider claws 3. After being respectively folded in a direction away from the bag, they can drive the two sides of the bag to be folded upward to improve the fluidity of the materials inside the bag, thereby facilitating material feeding. In addition, as an alternative implementation, the folding plate 6 can also be horizontally slidably connected to the two L-shaped plates, and the folding plate 6 is driven by a cylinder to perform horizontal reciprocating motion to improve the fluidity of the materials in the bag. Of course, the setting of the folding plate 6 above is not restrictive, that is to say, the folding plate 6 can be omitted, and the materials can be poured by tilting the moving platform 1, or the materials can be automatically dropped only by gravity, etc.

[0042] As Figure 1 , Figure 2 shown in the figure, in the bag clamping mechanism provided in this embodiment, the two ends of the two sets of folding plates 6 close to each other are rotatably connected through a second rotating shaft 7, and the two ends far from each other are respectively slidably installed on the body of the moving platform 1. The two ends of the two sets of folding plates 6 close to each other have circular holes, and the rotational connection is realized by inserting the second rotating shaft 7 into the circular holes, and the two ends far from each other are slidably installed on the L-shaped plates. By rotating one end and sliding the other end, the folding of the folding plate 6 can be realized, and the folding process is very stable, which is convenient for controlling the folding angle of the folding plate 6, thereby facilitating the adjustment of the deformation degree of the bag. In addition, as an alternative implementation, the two sets of folding plates 6 can also be rotatably connected to the moving platform 1. Specifically, the moving platform 1 is provided with a pin column extending outwards, and the folding plate 6 is provided with a circular hole matching the pin column. After the pin column and the circular hole are matched, the folding plate 6 can rotate around the pin column to realize folding.

[0043] As Figure 1As shown, in the bag clamping mechanism provided in this embodiment, a second driving member 8 is installed on the body of the moving table 1, that is, the second driving member 8 is connected to the L-shaped plate. The driving end of the second driving member 8 is connected to the second rotating shaft 7 in the middle of the two folding plates 6. The driving end of the second driving member 8 is connected to a sleeve rod, and the middle of the sleeve rod is hollow. The second rotating shaft 7 is inserted into the middle part of the sleeve rod to realize the telescopic drive of the second driving member 8 to make the two folding plates 6 fold and reset. Two groups of the second driving members 8 are symmetrically arranged at both ends of the second rotating shaft 7, that is, the second driving member 8 corresponds to both ends of the second rotating shaft 7 and directly acts on both ends of the second rotating shaft 7. Both ends of the second rotating shaft 7 can be subjected to the acting force of the second driving member 8, and the force is relatively uniform, making it more stable during the lifting and moving process. Furthermore, the folding path of the folding plate 6 is more accurate and will not deviate. In this embodiment, the second driving member 8 is a cylinder. Through the second driving member 8, the two folding plates 6 can be driven to fold at the same time. The folding plate 6 drives the packaging bag to fold through the spider claw 3, so as to achieve the purpose of increasing the material discharge. In addition, as an alternative embodiment, the second driving member 8 can also be a motor, the driving end is connected to a gear, and the gear meshes with a rack, thereby driving the rack to move up and down. The rack is connected to the second rotating shaft 7 through a sleeve rod, so as to realize the folding of the two folding plates 6.

[0044] As Figure 1 shown, in the bag clamping mechanism provided in this embodiment, a mounting plate 9 is arranged at the middle position above the body of the moving table 1. The mounting plate 9 is strip-shaped, and the second driving member 8 is vertically installed on the mounting plate 9. A connecting column 10 is installed in the middle of the mounting plate 9. The connecting column 10 is used to connect to the driving end of the lifting driving member. The lifting driving member is an external mechanism, and it is a cylinder itself. Through the driving of the lifting driving member, the moving table 1 moves towards the packaging bag. The connecting column 10 has a large area. When connecting to the lifting driving member, the contact area between the two is larger, which can improve the stability of the clamping mechanism after being connected to the lifting driving member. The mounting plate 9 has a large area. When connected to the second driving member 8, the contact area between the two is larger, which can make the second driving member 8 more firmly installed, thereby improving the overall stability of the clamping mechanism. In addition, as an alternative embodiment, when the area of the body of the moving table 1 is large, the mounting plate 9 can be omitted, and the second driving member 8 is directly installed on the body of the moving table 1.

[0045] As Figure 1 、 Figure 2 、 Figure 5As shown in the figure, in the bag clamping mechanism provided in this embodiment, the main body of the moving platform 1 has a chute 11 for guiding the sliding of the folding plate 6. The folding plate 6 is provided with rolling elements 12 that roll in the chute 11. A roller mounting seat 13 is detachably connected to the side of the folding plate 6. The rolling elements 12 are rotatably mounted on the mounting seat 13 through bearings 14. A part of the rolling elements 12 is inserted into the chute 11. The mounting seat 13 is a plate-like structure and is connected to the folding plate 6 by bolts. The rolling elements 12 can be rollers, with their pulley parts located in the chute 11 and their support shaft parts rotatably connected to the bearings 14. By connecting the rolling elements 12 to the folding plate 6 in a rotatable manner through the mounting seat 13, the guiding effect on the folding plate 6 is achieved, and the friction during the sliding of the folding plate 6 is small, reducing energy loss. In this embodiment, the rolling elements 12 can be rollers. The rolling elements 12 can reduce the friction with the chute 11, and during the sliding of the folding plate 6, the generated friction is smaller, thereby reducing energy loss and lowering the usage cost. Additionally, as an alternative implementation, a guide rail can also be provided on the main body of the moving platform 1, and the rolling elements 12 roll in the guide rail to guide the sliding of the folding plate 6.

[0046] As Figure 1 shown in the figure, in the bag clamping mechanism provided in this embodiment, the first driving member 5 drives the first rotating shaft 4 to rotate forward or backward through linear motion, so that the spider claws 3 extend or retract from the moving platform 1. Specifically, the first driving member 5 uses a cylinder, and its driving end is connected to one end of the first rotating shaft 4 through a crank. The first driving member 5 can directly drive the first rotating shaft 4 to rotate, and the connection structure is simple. According to the telescopic length of the first driving member 5, the rotation amplitude of the first rotating shaft 4 can be determined, thereby determining the position where the spider claws 3 extend from the moving platform 1, so as to determine whether the clamping of the bag is stable. Additionally, as an alternative implementation, the first driving member 5 can also use a motor, with its driving end connected to a first gear, and a second gear is arranged outside the first rotating shaft 4. The first gear and the second gear are both engaged with a transmission rack. By rotating the first driving member 5, the rotation amplitude of the first rotating shaft 4 can be controlled.

[0047] As Figure 1 shown in the figure, in the bag clamping mechanism provided in this embodiment, there are multiple first rotating shafts 4 arranged in parallel. The multiple first rotating shafts 4 are synchronously connected through a connecting rod 15. A spider claw 3 is connected to each first rotating shaft 4. The connecting rod 15 is a crank-rocker structure to achieve the synchronous rotation of the multiple first rotating shafts 4. The first driving member 5 can control the rotation of the multiple rotating shafts through the connecting rod 15, so that the spider claws 3 extend from the moving platform 1 and then insert into the bag. The multiple spider claws 3 can improve the stability after clamping. Additionally, as an alternative implementation, gears can also be provided outside each first rotating shaft 4, and then the multiple gears are connected by a rack, which can also achieve synchronous rotation.

[0048] As Figures 1 to 4 shown, in the bag clamping mechanism provided in this embodiment, the top of the spider claw 3 has an outlet for blowing air. Specifically, a trachea is installed inside the spider claw 3, and the other end of the trachea is connected to an inflation device. The inflation device transmits gas through the trachea to the outlet of the spider claw 3. By providing a blowing port on the spider claw 3, after it is inserted into the bag, it can blow air into the bag, improving the fluidity of the materials inside the bag, thereby making the feeding more sufficient and avoiding the materials remaining in the bag. In addition, as an alternative implementation, the first blowing member can also be set to be movable. In the initial state, it is used to inflate the inner bag. When the materials in the bag are being fed, the first blowing member 2 rotates to make the feeding more sufficient.

[0049] In addition, the unpacking machine provided in this embodiment, as Figure 6 shown, is a specific implementation of the unpacking machine provided in this embodiment, including a conveyor belt 16, a cutting knife 17, and the bag clamping mechanism described in the above solution. The bag clamping mechanism is arranged above the conveyor belt 16 and is spaced apart from the conveyor belt 16. The bag clamping mechanism is connected to a lifting driving member and is used to move closer to or away from the conveyor belt 16 in the direction of the conveyor belt 16 under the drive of the lifting driving member; the cutting knife 17 is arranged below the conveyor belt 16 and has at least a part extending upward from the conveyor belt 16 for cutting open the bag at the bottom; the cutting knife 17 is located upstream of the bag clamping mechanism. After the bottom of the bag is cut open by the cutting knife 17, the bag is lifted by the bag clamping mechanism so that the materials in the bag can be poured out. Specifically, the cutting direction of the cutting knife 17 is parallel to the transmission direction of the conveyor belt 16, and the insertion direction of the spider claw 3 in the bag clamping mechanism is perpendicular to the transmission direction of the conveyor belt 16. That is to say, after the bottom of the bag is cut open by the cutting knife 17, after the bag is grabbed by the bag clamping mechanism, through the folding of the folding plate 6 in the bag clamping mechanism, the opening at the bottom of the bag can be enlarged, facilitating the pouring of the materials.

[0050] The unpacking machine provided in this embodiment, through the cooperation of the conveyor belt 16, the cutting knife 17, and the bag clamping mechanism in the above solution, is convenient for unpacking double-layer bags and can make the materials in the bag be fed fully, avoiding waste.

[0051] The usage method of the bag clamping mechanism provided in this embodiment:

[0052] 1. Start the lifting driving member, drive the moving table 1 to move towards the bag until the first blowing member 2 is inserted into the inner bag to inflate the inner bag, making the inner bag plump and facilitating unpacking.

[0053] 2. Start the first driving member 5 to drive the first rotating shaft 4 to rotate, driving the spider claws 3 to turn over, so that the spider claws 3 pass through the inner bag and the outer bag to clamp the packaging bag.

[0054] 3. After the cutting knife 17 cuts the packaging bag, start the second driving member 8. The second driving member 8 drives the two groups of folding plates 6 to turn over, thereby driving the packaging bag to deform, so as to improve the fluidity of the material and facilitate feeding.

[0055] Obviously, the above embodiments are only examples given for clear illustration, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A packaging bag clamping mechanism, characterized in that, Comprising: A mobile station (1) for moving towards the packaging bag; A first blowing member (2) provided on the mobile station (1), and the air outlet end of the first blowing member (2) can be inserted into the inner bag of the packaging bag as the mobile station (1) moves, so as to inflate the inner bag; A spider claw (3) mounted on the mobile station (1) and provided on a first rotating shaft (4), and the spider claw (3) rotates around the first rotating shaft (4) to extend out of the mobile station (1) and insert into the packaging bag; A first driving member (5) with its driving end connected to the spider claw (3), and the first driving member (5) is used to drive the spider claw (3) to rotate to extend or retract from the mobile station (1); The mobile station (1) has two groups of folding plates (6) arranged symmetrically, and the spider claws (3) are respectively mounted on the two groups of folding plates (6). The two groups of folding plates (6) are adapted to be turned relatively away from the packaging bag, and the orientations of the spider claws (3) on the two groups of folding plates (6) are opposite after the spider claws (3) extend out of the folding plates (6); One end of the two groups of folding plates (6) close to each other is rotatably connected through a second rotating shaft (7), and the other ends away from each other are respectively slidably mounted on the body of the mobile station (1). The body of the mobile station (1) has a sliding groove (11) for guiding the sliding of the folding plates (6); A second driving member (8) is mounted on the body of the mobile station (1), and the driving end of the second driving member (8) is connected to the second rotating shaft (7) in the middle of the two groups of folding plates (6). The two groups of folding plates (6) are turned and reset by the telescopic driving of the second driving member (8); 2. The packaging bag clamping mechanism according to claim 1, characterized in that, There are two groups of the second driving members (8) symmetrically arranged at both ends of the second rotating shaft (7); 3. The packaging bag clamping mechanism according to claim 2, wherein, An installation plate (9) is arranged at the middle position above the body of the mobile station (1). The second driving member (8) is vertically mounted on the installation plate (9). A connecting column (10) is mounted in the middle of the installation plate (9), and the connecting column (10) is used to be connected to the driving end of the lifting driving member. The mobile station (1) moves towards the packaging bag by the driving of the lifting driving member; 4. The packaging bag clamping mechanism according to claim 1, characterized in that, The folding plate (6) has a rolling body (12) for rolling in the sliding groove (11). A roller mounting seat (13) is detachably mounted on the side of the folding plate (6). The rolling body (12) is rotatably mounted on the mounting seat (13) through a bearing (14), and a part of the rolling body (12) is inserted into the sliding groove (11); 5. The packaging bag clamping mechanism according to claim 1, wherein, The first driving member (5) drives the first rotating shaft (4) to rotate forward or backward through linear motion, so that the spider claw (3) extends or retracts from the mobile station (1); 6. The bag clamping mechanism according to claim 5, characterized in that, There are multiple first rotating shafts (4) arranged in parallel, and the multiple first rotating shafts (4) are synchronously connected through a connecting rod (15); 7. The packaging bag clamping mechanism according to any one of claims 1-6, characterized in that, The top of the spider claw (3) has an air outlet for blowing air; 8. An unpacking machine, characterized in that, Comprising: A conveyor belt (16), a cutting knife (17), and a packaging bag clamping mechanism according to any one of claims 1-7, wherein the packaging bag clamping mechanism is arranged above the conveyor belt (16) and is connected to a lifting driving member, and is configured to approach or move away from the conveyor belt (16) under the drive of the lifting driving member; The cutting knife (17) is arranged below the conveyor belt (16) and at least partially extends upward beyond the conveyor belt (16) for cutting open the packaging bag at the bottom; The cutting knife (17) is located upstream of the packaging bag clamping mechanism. After the bottom of the packaging bag is cut open by the cutting knife (17), the packaging bag is lifted by the packaging bag clamping mechanism so that the materials in the packaging bag are poured out.

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