CN220616491U - Wrapping bag fixture and have its bale breaker - Google Patents

Abstract

The utility model provides a packaging bag clamping mechanism and an unpacking machine with the same, which belong to the technical field of automatic unpacking, and comprise: the movable table is connected with an external mechanism and can move towards the packaging bag, the first blowing piece is arranged on the movable table, and the spider claw rotates around a first rotating shaft to extend out of the movable table and is inserted into the packaging bag; when the packaging bag is clamped, the movable table moves towards the packaging bag, so that the air blowing piece is driven to be inserted into the inner bag of the packaging bag, the air outlet end of the air blowing piece is used for inflating the inner bag, the surface of the inner bag is flattened, and then the first driving piece is started to drive the spider claw to clamp the packaging bag.

Description

Wrapping bag fixture and have its bale breaker

Technical Field

The utility model relates to the technical field of automatic unpacking, in particular to a packaging bag clamping mechanism and an unpacking machine with the same.

Background

Packaging materials of packaging bags are often used in industries such as food, pharmacy, health care products, milk powder, petroleum, chemical industry and the like. Wherein, the outer layer of the double-layer packaging bag adopts a woven bag, a kraft paper bag, a composite bag and the like, and the inner layer of the packaging bag adopts a plastic bag.

The automatic bale breaker on the market at present has very big limitation, requires that the wrapping bag is full, and the shape is unified, to some wrapping bags not full, the double-deck wrapping bag that pile up neatly condition is relatively poor and the material mobility is very poor, because inner bag and outer bag independent package, inner bag plastic bag forms the fold very easily, and fold department can amass the material, consequently is difficult to unpack.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the defect that when the automatic unpacking machine in the prior art unpacks double-layer packaging bags, the unpacking is difficult due to the folds of the inner bags, so that the packaging bag clamping mechanism and the unpacking machine with the same are provided.

In order to solve the technical problem, the present utility model provides a packaging bag clamping mechanism, comprising: a moving table for moving toward the packing bag;

the first air blowing piece is arranged on the moving table, and the air outlet end of the first air blowing piece can be inserted into the inner bag of the packaging bag along with the movement of the moving table so as to inflate the inner bag;

spider claws mounted on the moving table and provided on a first rotation shaft, the spider claws being inserted into the packaging bag by rotating around the first rotation shaft to extend out of the moving table;

the first driving piece is connected with the spider claw and used for driving the spider claw to rotate so as to extend or retract the moving table.

Optionally, the mobile station has two sets of folded plates that the symmetry set up, two sets of on the folded plate install respectively the spider claw, two sets of the folded plate is suitable for facing away from the direction of wrapping bag and turns over relatively, two sets of spider claw on the folded plate stretches out the orientation behind the folded plate is opposite.

Optionally, two sets of folded plates are rotatably connected through a second rotating shaft at the ends close to each other, and the ends far away from each other are respectively slidably installed on the body of the mobile station.

Optionally, install the second driving piece on the body of mobile station, the drive end of second driving piece is connected with two sets of the second pivot in the middle of the folded plate, through the flexible drive of second driving piece so that two sets of folded plate turns over and resets, the second driving piece is in the both ends symmetry of second pivot is provided with two sets of.

Optionally, the body top intermediate position of mobile station is provided with the mounting panel, the second driving piece is vertical to be installed on the mounting panel, the mid-mounting of mounting panel has the spliced pole, the spliced pole is used for being connected with the drive end of lift driving piece, through the drive of lift driving piece makes the mobile station moves towards the wrapping bag.

Optionally, the body of the mobile station is provided with a chute for guiding the sliding of the folded plate, the folded plate is provided with a rolling body for rolling in the chute, the side edge of the folded plate is detachably provided with a roller mounting seat, the rolling body is rotatably mounted on the mounting seat through a bearing, and a part of the rolling body is inserted in the chute.

Alternatively, the first driving member drives the first rotation shaft to perform forward rotation or reverse rotation by linear motion so as to extend or retract the spider claw from or to the moving stage.

Optionally, the first rotating shafts are provided with a plurality of rotating shafts which are arranged in parallel, and the plurality of first rotating shafts are synchronously connected through connecting rods.

Optionally, the tip of the spider claw has an outlet for blowing air.

A bale breaker, comprising: the packaging bag clamping mechanism is arranged above the conveying belt and is connected with a lifting driving piece, and the packaging bag clamping mechanism is driven by the lifting driving piece to approach or depart from the conveying belt;

the cutter is arranged below the conveyor belt and provided with a cutter which at least partially extends upwards out of the conveyor belt and is used for cutting the packaging bag at the bottom;

the cutting knife is located at the upstream of the packaging bag clamping mechanism, and after the bottom of the packaging bag is cut by the cutting knife, the packaging bag is lifted by the packaging bag clamping mechanism so that materials in the packaging bag can be poured out.

The technical scheme of the utility model has the following advantages:

1. according to the packaging bag clamping mechanism provided by the utility model, when the packaging bag is clamped, the movable table moves towards the packaging bag, so that the air blowing piece is driven to be inserted into the inner bag of the packaging bag, the air outlet end of the air blowing piece is used for inflating the inner bag, the surface of the inner bag is flattened, and then the first driving piece is started to drive the spider claw to clamp the packaging bag.

2. According to the packaging bag clamping mechanism provided by the utility model, the two groups of folded plates are connected with the packaging bag through the spider claw, and can drive the two sides of the packaging bag to be folded upwards after being folded towards the direction away from the packaging bag, so that the flowability of materials in the packaging bag is improved, and the discharging is facilitated.

3. According to the packaging bag clamping mechanism provided by the utility model, the first driving piece can control the plurality of rotating shafts to rotate through the connecting rod, so that the spider claws extend out of the moving table and are inserted into the packaging bag, and the stability of the spider claws after clamping can be improved.

4. According to the packaging bag clamping mechanism provided by the utility model, the air blowing port is arranged on the spider claw, so that air can be blown into the packaging bag after the spider claw is inserted into the packaging bag, and the flowability of materials in the packaging bag is improved, so that the blanking is more sufficient, and the materials are prevented from remaining in the packaging bag.

5. According to the unpacking machine provided by the utility model, the double-layer packaging bag is unpacked conveniently by matching the conveying belt, the cutting knife and the packaging bag clamping mechanism in the scheme, and materials in the packaging bag can be fully fed, so that waste is avoided.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of a package holding mechanism provided in a first embodiment of the present utility model;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a schematic view of the flap of FIG. 1 after being folded;

FIG. 5 is an enlarged schematic view of area A of FIG. 1;

fig. 6 is a top view of the bale breaker provided in the first embodiment.

Reference numerals illustrate:

1. a mobile station; 2. a first air blowing member; 3. spider claws; 4. a first rotating shaft; 5. a first driving member; 6. a folded plate; 7. a second rotating shaft; 8. a second driving member; 9. a mounting plate; 10. a connecting column; 11. a chute; 12. a rolling element; 13. a mounting base; 14. a bearing; 15. a connecting rod; 16. a conveyor belt; 17. a cutting knife.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in fig. 1 to 3, a specific implementation manner of the package bag clamping mechanism provided in this embodiment includes: the movable table 1, the first air blowing member 2, the spider claw 3 and the first driving member 5, the movable table 1 is connected with an external mechanism and can move towards the packaging bag, the first air blowing member 2 is arranged on the movable table 1, the air outlet end of the first air blowing member 2 can be inserted into the inner bag of the packaging bag to be inflated along with the movement of the movable table 1, the spider claw 3 is arranged on the movable table 1 through the first rotating shaft 4, the spider claw 3 rotates around the first rotating shaft 4 to extend out of the movable table 1 and be inserted into the packaging bag, and the driving end of the first driving member 5 is connected with the spider claw 3 and used for driving the spider claw 3 to extend or retract into the movable table 1. In this embodiment, the first blowing member 2 may be a pulse blowing nozzle, a jet machine, a blowing gun, or the like, as long as the outlet end thereof is sharp, and can be inserted into a packaging bag to be inflated. The middle of the spider claw 3 is provided with a circular hole, the spider claw 3 is sleeved on the first rotating shaft 4 through the circular hole, the moving table 1 is provided with a through hole opposite to the spider claw 3, the spider claw 3 passes through the through hole in the rotating process and then is inserted into the packaging bag, and the first driving piece 5 is an air cylinder.

The wrapping bag fixture that this embodiment provided, when carrying out the centre gripping to the wrapping bag, mobile station 1 removes to in driving the inner bag that blows the piece and inserts the wrapping bag, the end of giving vent to anger through the piece of blowing inflates in the inner bag, makes the surface of inner bag become level, then starts first driving piece 5 drive spider claw 3 and carries out the centre gripping to the wrapping bag, because spider claw 3 before carrying out the centre gripping, has made the inner bag become full, so spider claw 3 can carry out the centre gripping simultaneously to the inside and outside two-layer of wrapping bag, more makes things convenient for the empting of material in the wrapping bag.

As shown in fig. 1 to 4, in the packaging bag clamping mechanism provided in this embodiment, the moving table 1 has two sets of folded plates 6 symmetrically arranged, the two sets of folded plates 6 are respectively provided with spider claws 3, the folded plates 6 can be folded relatively towards the direction far away from the packaging bag, the directions of the spider claws 3 on the two sets of folded plates 6 after extending out of the folded plates 6 are opposite, specifically, the two sets of folded plates 6 are respectively provided with a first driving member 5, the two first driving members 5 are oppositely arranged, the directions of the driving ends of the two first driving members are opposite, so that the opposite directions of the spider claws 3 are realized, the clamping range of the packaging bag can be enlarged after the spider claws 3 extend out of the folded plates 6, the packaging bag is more stable in the moving process, the packaging bag is positioned in the middle position of the moving table 1, the first rotating shaft 4 is also installed on the folded plates 6, and the two sides of the two sets of folded plates 6 are provided with L-shaped plates, and the moving table 1 is formed by connecting the L-shaped plates and the two sets of folded plates 6. Two sets of folded plates 6 are connected with the packaging bag through spider claws 3, and can drive the two sides of the packaging bag to be folded upwards after being folded towards the direction away from the packaging bag respectively, so that the flowability of materials inside the packaging bag is improved, and the discharging is facilitated. In addition, as an alternative embodiment, the folded plate 6 can also be connected with two L-shaped plates in a transverse sliding manner, and the folded plate 6 is driven by a cylinder to perform transverse reciprocating motion so as to improve the flowability of materials in the packaging bag. Of course, the arrangement of the above-mentioned flap 6 is not limitative, that is to say, the flap 6 may be omitted, the material may be poured by tilting the mobile station 1, or the material may be automatically blanked by gravity alone, or the like.

As shown in fig. 1 and 2, in the packaging bag clamping mechanism provided in this embodiment, two sets of folded plates 6 are rotatably connected through a second rotating shaft 7 at one ends close to each other, one ends far away from each other are slidably mounted on the body of the mobile station 1, one ends close to each other of the two sets of folded plates 6 are provided with circular holes, the two sets of folded plates are inserted into the circular holes through the second rotating shaft 7 to realize rotation connection, and one ends far away from each other are slidably mounted on the L-shaped plate. The folding plate 6 can be folded through one end rotation and the other end sliding, the folding process is very stable, the folding angle of the folding plate 6 is convenient to control, and the deformation degree of the packaging bag is convenient to adjust. In addition, as an alternative embodiment, the two sets of folded plates 6 may also be rotatably connected with the mobile station 1, specifically, the mobile station 1 is provided with a pin extending outwards, the folded plates 6 are provided with round holes matched with the pin, and after the pin is matched with the round holes, the folded plates 6 can rotate with the pin as the center, thereby realizing folding.

As shown in fig. 1, in the packaging bag clamping mechanism provided in this embodiment, a second driving member 8 is mounted on the body of the mobile station 1, that is, the L-shaped plate is connected with the second driving member 8, the driving end of the second driving member 8 is connected with a second rotating shaft 7 in the middle of two sets of folded plates 6, the driving end of the second driving member 8 is connected with a sleeve rod, the middle of the sleeve rod is hollow, the second rotating shaft 7 is inserted into the middle part of the sleeve rod, so as to realize the telescopic driving of the second driving member 8, so that the two sets of folded plates 6 are folded and reset, and two sets of second driving members 8 are symmetrically arranged at two ends of the second rotating shaft 7, that is, the second driving member 8 corresponds to two ends of the second rotating shaft 7 and directly acts on two 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 piece 8, the stress is relatively uniform, the lifting movement process is more stable, the folding path of the folded plate 6 is more accurate, and the offset can not occur. In the present embodiment, the second driving member 8 employs a cylinder. Can drive two sets of folded plates 6 simultaneously through second driving piece 8 and turn over, folded plate 6 drives the wrapping bag through spider claw 3 and turns over to reach the purpose that increases the unloading. In addition, as an alternative embodiment, the second driving member 8 may be a motor, the driving end is connected with a gear, the gear is meshed with a rack, and then the rack is driven to move up and down, and the rack is connected with the second rotating shaft 7 through a loop bar, so that the folding of the two sets of folded plates 6 is realized.

As shown in fig. 1, in the packaging bag clamping mechanism provided in this embodiment, a mounting plate 9 is disposed at a middle position above a mobile station 1 body, the mounting plate 9 is in a long strip shape, a second driving member 8 is vertically mounted on the mounting plate 9, a connecting column 10 is mounted in the middle of the mounting plate 9, the connecting column 10 is used for being connected with a driving end of a lifting driving member, the lifting driving member is an external mechanism, and is a cylinder, and the mobile station 1 is driven by the lifting driving member to move towards the packaging bag. The connecting column 10 has a larger area, and when connected with the lifting driving member, the contact area between the connecting column and the lifting driving member is larger, so that the stability of the clamping mechanism after being connected with the lifting driving member can be improved. The mounting plate 9 has a larger area, and when being connected with the second driving piece 8, the contact area between the mounting plate and the second driving piece is larger, so that the second driving piece 8 can be mounted more firmly, and the overall stability of the clamping mechanism is improved. In addition, as an alternative embodiment, the mounting plate 9 may be omitted when the body area of the mobile station 1 is large, and the second driving member 8 is directly mounted on the body of the mobile station 1.

As shown in fig. 1, 2 and 5, in the package holding mechanism provided in this embodiment, a body of a mobile station 1 has a chute 11 for guiding sliding of a folded plate 6, the folded plate 6 has a rolling body 12 for rolling in the chute 11, a roller mounting seat 13 is detachably connected to a side edge of the folded plate 6, the rolling body 12 is rotatably mounted on the mounting seat 13 through a bearing 14, a part of the rolling body 12 is inserted in the chute 11, the mounting seat 13 is in a plate-like structure and is connected with the folded plate 6 through a bolt, the rolling body 12 can be a roller, a pulley part of the roller is positioned in the chute 11, and a supporting shaft part of the roller is rotatably connected with the bearing 14. The rolling bodies 12 are rotatably connected with the folded plates 6 through the mounting seats 13, so that the guiding effect on the folded plates 6 is realized, the friction force is small when the folded plates 6 slide, the energy loss is reduced, and in the embodiment, the rolling bodies 12 can be rollers. The rolling elements 12 can reduce friction with the sliding grooves 11, and friction force generated in the sliding process of the folded plate 6 is smaller, so that energy loss is reduced, and use cost is reduced. Alternatively, a guide rail may be provided on the mobile station 1 body, and the rolling elements 12 roll in the guide rail to guide the sliding of the shutter 6.

As shown in fig. 1, in the packaging 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 claw 3 extends or retracts into the moving table 1, specifically, the first driving member 5 adopts an air cylinder, and its driving end is connected with one end of the first rotating shaft 4 through a crank. The first rotating shaft 4 can be directly driven to rotate through the first driving piece 5, the connecting structure is simple, the rotating amplitude of the first rotating shaft 4 can be determined according to the telescopic length of the first driving piece 5, and therefore the position of the spider claw 3 extending out of the mobile station 1 is determined, and whether the clamping of the packaging bag is stable or not is determined. In addition, as an alternative embodiment, the first driving member 5 may also adopt a motor, the driving end of the motor is connected with a first gear, a second gear is disposed on the outer side of the first rotating shaft 4, the first gear and the second gear are meshed with the transmission rack at the same time, and the rotation amplitude of the first rotating shaft 4 can be controlled through the rotation of the first driving member 5.

As shown in fig. 1, in the packaging bag clamping mechanism provided in this embodiment, the first rotating shafts 4 have a plurality of parallel first rotating shafts 4, and are synchronously connected through the connecting rod 15, and each first rotating shaft 4 is connected with the spider claw 3, and the connecting rod 15 is a crank rocker structure, so as to realize synchronous rotation of the plurality of first rotating shafts 4. The first driving member 5 can control the rotation of the plurality of rotating shafts through the connecting rod 15, so that the spider claw 3 extends out of the moving table 1 and is inserted into the packaging bag, and the stability of the spider claw 3 after clamping can be improved. In addition, as an alternative embodiment, a gear may be provided on the outer side of each first shaft 4, and then a plurality of gears may be connected by a rack, so that synchronous rotation can be achieved.

As shown in fig. 1 to 4, in the packaging bag holding mechanism provided in this embodiment, the top end of the spider claw 3 has an outlet for blowing, specifically, an air pipe is installed inside the spider claw 3, the other end of the air pipe is connected with an inflating device, and the inflating device transmits air to the outlet of the spider claw 3 through the air pipe. Through set up the gas-blowing mouth on spider claw 3, after it inserts the wrapping bag inside, can blow to the wrapping bag inside, improve the inside material mobility of wrapping bag to make the unloading more abundant, avoid the material to remain in the wrapping bag. In addition, as an alternative embodiment, the first blowing member 2 may be configured to be movable, and in the initial state, to inflate the inner bag, and when the material in the packaging bag is to be discharged, the first blowing member 2 may be rotated, so that the discharging is more complete.

In addition, as shown in fig. 6, the bale breaker provided in this embodiment is a specific implementation manner of the bale breaker provided in this embodiment, and includes a conveyor belt 16, a cutter 17, and the package clamping mechanism described in the foregoing solution, where the package clamping mechanism is disposed above the conveyor belt 16 and keeps a distance from the conveyor belt 16, and the package clamping mechanism is connected to a lifting driving member, and is driven by the lifting driving member to approach or separate from the conveyor belt 16; a cutter 17 is provided below the conveyor belt 16 and has at least a portion projecting upward from the conveyor belt 16 for cutting the package at the bottom; the cutting knife 17 is located upstream of the package holding mechanism, and after the bottom of the package is cut by the cutting knife 17, the package is lifted by the package holding mechanism so that the material in the package is poured out. Specifically, the cutting direction of the cutter 17 is parallel to the conveying direction of the conveyor belt 16, and the insertion direction of the spider claw 3 into the packaging bag in the packaging bag clamping mechanism is perpendicular to the conveying direction of the conveyor belt 16. That is, when the bottom of the package is cut by the cutter 17, the opening of the bottom of the package can be enlarged by folding the folded plate 6 in the package holding mechanism after the package is grasped by the package holding mechanism, thereby facilitating the pouring of the material.

The bale breaker that this embodiment provided is convenient for unpack the double-deck wrapping bag through the cooperation of wrapping bag in conveyer belt 16, cutting knife 17 and the above-mentioned scheme with holding the mechanism to can make the material in the wrapping bag fully unloading, avoid extravagant.

The application method of the packaging bag holding mechanism provided by the embodiment comprises the following steps:

1. the lifting driving piece is started to drive the movable table 1 to move towards the direction of the packaging bag until the first blowing piece 2 is inserted into the inner bag, and the inner bag is inflated, so that the inner bag is full and unpacked conveniently.

2. The first driving piece 5 is started to drive the first rotating shaft 4 to rotate, and the spider claw 3 is driven to overturn, so that the spider claw 3 passes through the inner bag and the outer bag, and the packaging bag is clamped.

3. After the packing bag is scratched by the cutter 17, the second driving piece 8 is started, and the second driving piece 8 drives the two groups of folded plates 6 to turn over, so that the packing bag is driven to deform, the flowability of materials is improved, and the blanking is facilitated.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims (10)

1. A package bag holding mechanism, comprising:

a moving table (1) for moving toward the packaging bag;

the first air blowing piece (2) is arranged on the mobile station (1), and the air outlet end of the first air blowing piece (2) can be inserted into an inner bag of the packaging bag along with the movement of the mobile station (1) so as to inflate the inner bag;

a spider claw (3) mounted on the moving table (1) and provided on a first rotation shaft (4), the spider claw (3) being inserted into the packaging bag by rotating around the first rotation shaft (4) so as to protrude out of the moving table (1);

the first driving piece (5) is connected with the spider claw (3), and the first driving piece (5) is used for driving the spider claw (3) to rotate so as to extend or retract the mobile station (1).

2. A package holding mechanism according to claim 1, characterized in that the mobile station (1) has two sets of flaps (6) arranged symmetrically, the two sets of flaps (6) being provided with respective spider claws (3), the two sets of flaps (6) being adapted to be folded relatively in a direction away from the package, the spider claws (3) of the two sets of flaps (6) being oriented in opposite directions after having extended beyond the flaps (6).

3. A bag gripping mechanism according to claim 2, wherein the mutually adjacent ends of the two sets of flaps (6) are rotatably connected by means of a second rotation shaft (7), and the mutually distant ends are slidably mounted on the body of the mobile station (1), respectively.

4. A package holding mechanism according to claim 3, wherein a second driving member (8) is mounted on the body of the mobile station (1), the driving end of the second driving member (8) is connected with a second rotating shaft (7) between the two groups of folded plates (6), the folded plates (6) of the two groups are folded and reset by the telescopic driving of the second driving member (8), and the two groups of second driving members (8) are symmetrically arranged at two ends of the second rotating shaft (7).

5. The packaging bag clamping mechanism according to claim 4, wherein a mounting plate (9) is arranged at a middle position above the body of the mobile station (1), the second driving piece (8) is vertically mounted on the mounting plate (9), a connecting column (10) is mounted in the middle of the mounting plate (9), the connecting column (10) is used for being connected with the driving end of a lifting driving piece, and the mobile station (1) is driven to move towards the packaging bag by the lifting driving piece.

6. A bag gripping apparatus according to claim 2, characterized in that the body of the mobile station (1) is provided with a chute (11) for guiding the sliding of the flap (6), the flap (6) is provided with a rolling element (12) for rolling in the chute (11), the side edge of the flap (6) is detachably provided with a roller mounting seat (13), the rolling element (12) is rotatably mounted on the mounting seat (13) by means of a bearing (14), and a part of the rolling element (12) is inserted in the chute (11).

7. The bag gripping mechanism according to any one of claims 1 to 6, wherein the first driving member (5) drives the first rotation shaft (4) to rotate forward or backward by a linear motion to extend or retract the spider claw (3) to the moving stage (1).

8. The packaging bag clamping mechanism according to claim 7, wherein the first rotating shafts (4) are provided with a plurality of first rotating shafts which are arranged in parallel, and the first rotating shafts (4) are synchronously connected through connecting rods (15).

9. The bag gripping mechanism according to any one of claims 1 to 6, characterized in that the top end of the spider claw (3) has an outlet for blowing air.

10. A bale breaker, comprising: a conveyor belt (16), a cutter (17) and the packaging bag clamping mechanism as claimed in any one of claims 1 to 9, wherein the packaging bag clamping mechanism is arranged above the conveyor belt (16) and is connected with a lifting driving piece, and is used for approaching or separating towards the conveyor belt (16) under the driving of the lifting driving piece;

the cutter (17) is arranged below the conveyor belt (16) and is provided with a cutter which at least partially extends upwards out of the conveyor belt (16) for cutting the packaging bags at the bottom;

the cutting knife (17) is positioned at the upstream of the packaging bag clamping mechanism, and after the bottom of the packaging bag is cut by the cutting knife (17), the packaging bag is lifted by the packaging bag clamping mechanism so that materials in the packaging bag can be poured out.