Bag opening device of packaging machine

Abstract

The utility model provides a bag opening device of a packaging machine. The bag opening device of the packaging machine comprises a machine frame, two sets of symmetrically-arranged bag opening adsorption assemblies and two sets of symmetrically-arranged side edge positioning assemblies. The bag opening adsorption assembly reciprocates through the driving assembly and sucks the surface of a bag body to complete the bag opening action. And the side edge positioning assembly is used for guiding and positioning the side edge of the bag body. The side edge positioning assembly comprises a clamping plate, an opening and closing driving mechanism and a moving driving mechanism, the opening and closing driving mechanism comprises a finger air cylinder, a first air cylinder base, a first air cylinder and a lifting transverse plate, and the moving driving mechanism is composed of a first belt and a first servo motor. The bag opening adsorption assembly comprises a bag opening suction nozzle, a connecting rod, a positioning ring and a spring, and the driving assembly is composed of a first mounting plate and a second air cylinder. Through cooperative work, it is ensured that the bag opening process is stable, bag body deflection is avoided, and the flatness of a bag opening is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a packaging machine bag opening device. BACKGROUND

[0002] In the field of packaging equipment, the bag opening mechanism is one of the key components to realize automatic packaging. At present, the existing bag opening mechanism of the packaging equipment on the market mainly relies on the cooperation of the clamping jaw cylinder, the bag opening cylinder and the suction cup to complete the bag opening action. For example, the Chinese invention patent application "CN114955104A" discloses a packaging machine, and its bag opening mechanism includes two clamping jaw cylinders, an upper bag opening cylinder and a lower bag opening cylinder, and a plurality of suction cups. The outer side of the clamping jaw cylinder is provided with a push plate cylinder, and the inner side is provided with a compression device. The upper bag opening cylinder and the lower bag opening cylinder are respectively provided with a plurality of suction cups for adsorbing the front and back of the bag, so as to realize the opening of the bag. Limiting adjustment screws are arranged between the clamping jaw cylinder and the push plate cylinder for limiting the return of the clamping jaw cylinder, so as to ensure the flatness of the closed bag.

[0003] However, the bag opening mechanism in the packaging machine has the following problems: in the bag opening process, only two groups of symmetrical suction cups are relied on, and the two side edges of the bag are not guided and positioned, which is easy to cause wrinkles or unevenness in the bag opening process, and even the whole bag body is deflected, which directly affects the subsequent bag opening heat sealing. The bag body after heat sealing is deflected, so that the shape of the sealing part and the two sides of the bag body is irregular, which cannot form a normal sealing shape, thereby affecting the packaging quality. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model lies in that, in view of the defects of the prior art, a packaging machine bag opening device is provided. In the bag opening process, the bag opening adsorption assembly adsorbs the front and back of the bag, and the side edge positioning assembly guides and positions the two side edges of the bag, so as to ensure stable bag opening, avoid deflection, and make the bag opening shape regular and flat after heat sealing.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a packaging machine bag opening device, comprising a rack, two groups of symmetrically arranged bag opening adsorption assemblies capable of adsorbing the surface of the bag body, and a driving assembly capable of driving the bag opening adsorption assembly to reciprocate towards the surface of the bag body, characterized in that: a side edge positioning assembly distributed on the side edge of the bag body and capable of reciprocating towards the side edge of the bag body is further included.

[0006] According to the technical scheme, the bag opening adsorption assembly and the side positioning assembly work cooperatively during the bag opening process. The two sets of bag opening adsorption assemblies first adsorb the front and back of the bag, and then the side positioning assembly guides and positions the two sides of the bag, so that the bag remains stable during the bag opening process, and the bag can effectively avoid deflection during the bag opening process. Not only can the bag opening function be realized, but also the shape of the bag opening heat sealing is regular, and the normal sealing shape is formed, so that the flatness of the bag opening is ensured.

[0007] The bag opening device of the packaging machine can be further provided with two sets of symmetrical clamping plates, an opening and closing driving mechanism for controlling the opening and closing of the two sets of clamping plates, and a moving driving mechanism connected with the opening and closing driving mechanism and capable of driving the clamping plates to reciprocate towards the side of the bag body.

[0008] According to the technical scheme, the moving driving mechanism controls the opening and closing driving mechanism and the clamping plates to move towards the bag body synchronously until the opening and closing driving mechanism controls the two sets of clamping plates to clamp the side of the bag body. At the same time, the driving assembly can drive the bag opening adsorption assembly to move towards the surface of the bag body until the bag opening adsorption assembly adsorbs the surface of the bag body, and then performs the bag opening action. At the same time, the moving driving mechanism drives the clamping plates to move towards the bag body to adapt to the deformation of the bag body after being opened, so as to avoid excessive stretching or deformation of the bag body.

[0009] The bag opening device of the packaging machine can be further provided with a finger air cylinder, a first cylinder seat connected with the finger air cylinder, a first cylinder connected with the first cylinder seat, a lifting cross plate fixedly connected with the body of the first cylinder, and a moving driving mechanism connected with the end of the lifting cross plate.

[0010] According to the technical scheme, the finger air cylinder is used to control the opening and closing action of the clamping plates to realize clamping and releasing of the side of the bag body. The first cylinder is used to control the lifting of the finger air cylinder, that is, the lifting of the clamping plates, to adapt to different specifications and types of bag bodies or working conditions. The sliding cooperation of the guide rod and the guide hole ensures that the lifting movement of the clamping plates is stable and accurate, and avoids deviation of the clamping plates during lifting. The moving driving mechanism is used to control the finger air cylinder, the clamping plates, the first cylinder seat, the first cylinder, and the lifting cross plate to move towards or away from the bag body synchronously.

[0011] The bag opening device of the packaging machine can be further provided with a first belt, a first servo motor, a connecting block fixedly connected with the first belt, a first sliding block connected with the connecting block, a first sliding rail in sliding cooperation with the first sliding block, and the first sliding rail being parallel to the first belt.

[0012] By adopting the technical scheme, the first servo motor drives the connecting block to move through the first belt, so that the clamping plate is close to or away from the bag body. The first sliding block and the first sliding rail improve the movement stability of the connecting block.

[0013] The bag opening device of the packaging machine can be further provided with a bag opening and adsorbing assembly, which comprises a bag opening suction nozzle and a connecting rod connected with the bag opening suction nozzle, the connecting rod is slidably connected with a positioning ring, the end of the connecting rod close to the positioning ring is provided with a limiting step, the outer periphery of the connecting rod is provided with a spring, the two ends of the spring are respectively connected with the positioning ring and the suction nozzle, and the positioning ring is connected with a driving assembly.

[0014] By adopting the technical scheme, the driving assembly drives the positioning ring to move, so that the connecting rod and the bag opening suction nozzle move towards the surface of the packaging bag. The bag opening suction nozzle sucks the surface of the bag body. The spring provides elastic buffering during the movement of the connecting rod, so that the contact between the bag opening suction nozzle and the surface of the packaging bag is stable, and damage or unstable adsorption of the packaging bag caused by hard contact is avoided. The limiting step and the positioning ring limit the movement range of the connecting rod, so that the bag opening suction nozzle is prevented from being excessively stretched and contracted, that is, the connecting rod is prevented from being pulled out of the positioning ring.

[0015] The bag opening device of the packaging machine can be further provided with a driving assembly, which comprises a first mounting plate and a second air cylinder connected with the first mounting plate, and the first mounting plate is provided with a strip-shaped hole, and the positioning ring is clamped in the strip-shaped hole.

[0016] By adopting the technical scheme, the second air cylinder drives the positioning ring to move towards the bag body through the first mounting plate, and the positioning ring drives the bag opening suction nozzle to move forward through the connecting rod and the spring. By arranging the strip-shaped hole, the position of the positioning ring can be adjusted according to the actual situation.

[0017] The bag opening device of the packaging machine can be further provided with a bag opening and adsorbing assembly, which comprises a bag opening suction nozzle and a connecting rod connected with the bag opening suction nozzle, the connecting rod is slidably connected with a positioning ring, the end of the connecting rod close to the positioning ring is provided with a limiting step, the outer periphery of the connecting rod is provided with a spring, the two ends of the spring are respectively connected with the positioning ring and the suction nozzle, and the positioning ring is connected with a driving assembly.

[0018] By adopting the technical scheme, the third air cylinder drives the copper knife to move towards the opening of the packaging bag until the copper knife contacts the opening of the packaging bag. The fourth air cylinder drives the plastic strip to move towards the opening of the packaging bag, and cooperates with the copper knife to complete the heat sealing operation. The copper knife has good heat conductivity and wear resistance, and can quickly and uniformly heat seal the opening of the packaging bag, thereby improving the heat sealing quality. The plastic strip cooperates with the copper knife to provide a contact surface required for heat sealing, so as to ensure the uniformity of heat sealing. Meanwhile, the plastic strip can buffer the contact force between the copper knife and the packaging bag, so as to avoid damage of the packaging bag caused by hard contact, and improve the uniformity and stability of heat sealing.

[0019] The bag opening device of the packaging machine can be further provided with a bag feeding mechanism on the frame, the bag feeding mechanism comprising a bag feeding suction assembly and a second mounting plate linked with the bag feeding suction assembly, the second mounting plate being linked with a fifth cylinder, the body of the fifth cylinder being linked with a rotating shaft, the rotating shaft being hinged to the frame, and the end of the rotating shaft being linked with a second belt through a pulley, the second belt being linked with a second servo motor through a pulley, and the bag feeding mechanism further comprising a bag frame mounted on the frame.

[0020] The second servo motor drives the fifth cylinder to rotate through the second belt and the rotating shaft until the bag feeding suction assembly is aligned with the bag frame. The fifth cylinder drives the bag feeding suction assembly to extend and suck the bag body, and then the fifth cylinder drives the bag feeding suction assembly to reset. Then the second servo motor drives the fifth cylinder to rotate through the second belt and the rotating shaft, and the fifth cylinder drives the bag feeding suction assembly to extend until the bag opening suction assembly sucks the bag body and the bag feeding suction assembly releases the bag body.

[0021] The bag opening device of the packaging machine can be further provided with a bag feeding mechanism on the frame, the bag feeding mechanism comprising a bag feeding suction assembly and a second mounting plate linked with the bag feeding suction assembly, the second mounting plate being linked with a fifth cylinder, the body of the fifth cylinder being linked with a rotating shaft, the rotating shaft being hinged to the frame, and the end of the rotating shaft being linked with a second belt through a pulley, the second belt being linked with a second servo motor through a pulley, and the bag feeding mechanism further comprising a bag frame mounted on the frame.

[0022] The third servo motor drives the discharge belt to rotate through the roller shaft, and automatically transports the packaging bag that has completed packaging and heat sealing.

[0023] The utility model will be further explained in detail in connection with the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a whole machine schematic view of the embodiment of the utility model;

[0025] Figure 2 It is a side positioning assembly schematic view of the embodiment of the utility model;

[0026] Figure 3 It is a bag feeding mechanism schematic view of the embodiment of the utility model;

[0027] Figure 4 It is a bag mouth heat sealing mechanism schematic view of the embodiment of the utility model;

[0028] Figure 5 It is a discharge belt part structure schematic view of the embodiment of the utility model;

[0029] Figure 6 It is a bag opening suction assembly schematic view of the embodiment of the utility model;

[0030] Figure 7 It is Figure 6A magnified view of a portion of point A in the middle.

[0031] Labeling notes: Bag opening suction assembly a, bag opening suction nozzle a1, connecting rod a2, positioning ring a3, limiting step a4, spring a5, first mounting plate a6, second cylinder a7, strip hole a8; Side positioning assembly b, clamping plate b1, finger cylinder b2, first cylinder seat b3, first cylinder b4, lifting cross plate b5, guide rod b6, first belt b7, first servo motor b8, connecting block b9, first slider b10, first slide rail b11; Bag opening heat sealing mechanism c, copper knife c1, plastic strip c2, third cylinder c3, fourth cylinder c4; Bag feeding mechanism d, second mounting plate d1, fifth cylinder d2, rotating shaft d3, second belt d4, second servo motor d5, bag frame d6; Discharge belt e, third servo motor e1, baffle plate e2. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1 to 7 The packaging machine bag opening device shown includes a frame, two sets of symmetrically arranged bag opening adsorption components a that can respectively adhere to the surface of the bag, and side positioning components b distributed on the side of the bag and capable of reciprocating towards the side of the bag. The bag opening adsorption components a are linked to a drive component capable of driving the bag opening adsorption components a to reciprocate towards the surface of the bag.

[0034] The side positioning component b includes two sets of symmetrically arranged clamping plates b1 and an opening and closing drive mechanism that controls the opening and closing of the two sets of clamping plates b1. The opening and closing drive mechanism is linked to a moving drive mechanism that can drive the clamping plates b1 to reciprocate toward the side of the bag.

[0035] The moving drive mechanism controls the opening and closing drive mechanism and the clamping plate b1 to move synchronously toward the bag body until the opening and closing drive mechanism controls the two sets of clamping plates b1 to clamp the sides of the bag body. At the same time, the drive assembly can drive the bag opening suction assembly a to move toward the surface of the bag body until the bag opening suction assembly a sucks onto the surface of the bag body, and then the bag opening action is performed. At the same time, the moving drive mechanism will drive the clamping plate b1 to move toward the bag body to accommodate the deformation caused by the bag body after opening, and avoid excessive stretching or deformation of the bag body.

[0036] The opening and closing driving mechanism comprises a finger cylinder b2, the finger cylinder b2 is linked with a first cylinder seat b3, the first cylinder seat b3 is linked with a first cylinder b4, the body of the first cylinder b4 is fixedly connected with a lifting horizontal plate b5, the end of the lifting horizontal plate b5 is linked with a moving driving mechanism, the two ends of the first cylinder seat b3 are provided with guide rods b6, and the lifting horizontal plate b5 is provided with guide holes in sliding fit with the guide rods b6. The finger cylinder b2 is used for controlling the opening and closing action of the clamping plate b1, realizing the clamping and releasing of the side edge of the bag body. The first cylinder b4 is used for controlling the lifting of the finger cylinder b2, that is, controlling the lifting of the clamping plate b1, so as to adapt to different specifications and types of bag bodies or working conditions. The sliding fit of the guide rods b6 and the guide holes ensures that the lifting movement of the clamping plate b1 is stable and accurate, avoiding the deviation of the clamping plate b1 during the lifting process. The moving driving mechanism is used for controlling the finger cylinder b2, the clamping plate b1, the first cylinder seat b3, the first cylinder b4 and the lifting horizontal plate b5 to move towards or away from the bag body synchronously.

[0037] The moving driving mechanism comprises a first belt b7 and a first servo motor b8, the first belt b7 is linked with the first servo motor b8 through a belt wheel, the first belt b7 is fixedly provided with a connecting block b9, the connecting block b9 is connected with the end of the lifting horizontal plate b5, the connecting block b9 is further linked with a first sliding block b10, the first sliding block b10 is in sliding fit with a first sliding rail b11, and the first sliding rail b11 is parallel to the first belt b7. The first servo motor b8 drives the connecting block b9 to move through the first belt b7, so that the clamping plate b1 moves towards or away from the bag body. The first sliding block b10 and the first sliding rail b11 improve the movement stability of the connecting block b9.

[0038] The bag opening and adsorbing assembly a comprises a bag opening suction nozzle a1 and a connecting rod a2 linked with the bag opening suction nozzle a1, the connecting rod a2 is in sliding fit with a positioning ring a3, the end of the connecting rod a2 close to the positioning ring a3 is provided with a limiting step a4, the outer periphery of the connecting rod a2 is provided with a spring a5, the two ends of the spring a5 are respectively in abutting connection with the positioning ring a3 and the suction nozzle, and the positioning ring a3 is linked with a driving assembly. The driving assembly pushes the positioning ring a3, so that the connecting rod a2 and the bag opening suction nozzle a1 move towards the surface of the packaging bag. The bag opening suction nozzle a1 sucks the surface of the bag body. The spring a5 provides elastic buffering during the movement of the connecting rod a2, so that the contact between the bag opening suction nozzle a1 and the surface of the packaging bag is stable, and the packaging bag is prevented from being damaged or adsorbed unstably due to hard contact. The limiting step a4 and the positioning ring a3 limit the movement range of the connecting rod a2, preventing the bag opening suction nozzle a1 from being excessively stretched and contracted, that is, preventing the connecting rod a2 from being pulled out of the positioning ring a3.

[0039] The driving assembly comprises a first mounting plate a6 and a second cylinder a7 connected with the first mounting plate a6, the first mounting plate a6 is provided with a strip-shaped hole a8, and the positioning ring a3 is clamped in the strip-shaped hole a8. The driving assembly pushes the positioning ring a3, so that the connecting rod a2 and the bag opening suction nozzle a1 move towards the surface of the packaging bag. The bag opening suction nozzle a1 sucks the surface of the bag body. The spring a5 provides elastic buffering during the movement of the connecting rod a2, so that the contact between the bag opening suction nozzle a1 and the surface of the packaging bag is stable, and the packaging bag is prevented from being damaged or adsorbed unstably due to hard contact. The cooperation between the limiting step a4 and the positioning ring a3 limits the movement range of the connecting rod a2, so that the bag opening suction nozzle a1 is prevented from being excessively stretched or retracted, that is, the bag opening suction nozzle a1 is prevented from being pulled out of the positioning ring a3.

[0040] The rack is also provided with a bag opening heat sealing mechanism c distributed above the bag opening suction assembly a. The bag opening heat sealing mechanism c comprises symmetrically distributed copper knives c1 and plastic strips c2. The copper knives c1 are connected with a third cylinder c3 which can drive the copper knives c1 to reciprocate towards the bag body. The plastic strips c2 are connected with a fourth cylinder c4 which can drive the plastic strips c2 to reciprocate towards the bag body. The third cylinder c3 drives the copper knives c1 to move towards the opening of the packaging bag until the copper knives c1 contact the opening of the packaging bag. The fourth cylinder c4 drives the plastic strips c2 to move towards the opening of the packaging bag, cooperates with the copper knives c1, and completes the heat sealing operation. The copper knives c1 have good heat conductivity and wear resistance, can quickly and uniformly heat seal the opening of the packaging bag, and improve the heat sealing quality. The plastic strips c2 cooperate with the copper knives c1 to provide the contact surface required for heat sealing, so as to ensure the uniformity of heat sealing. Meanwhile, the plastic strips c2 can buffer the contact force between the copper knives c1 and the packaging bag, so as to prevent the packaging bag from being damaged due to hard contact, and improve the uniformity and stability of heat sealing.

[0041] The rack is also provided with a bag feeding mechanism d. The bag feeding mechanism d comprises a bag feeding suction assembly and a second mounting plate d1 connected with the bag feeding suction assembly. The second mounting plate d1 is connected with a fifth cylinder d2. The body of the fifth cylinder d2 is connected with a rotating shaft d3 which is hinged to the rack. The end of the rotating shaft d3 is connected with a second belt d4 through a belt wheel. The second belt d4 is connected with a second servo motor d5 through a belt wheel. The bag feeding mechanism d further comprises a bag frame d6 mounted on the rack. The second servo motor d5 drives the fifth cylinder d2 to rotate through the second belt d4 and the rotating shaft d3, until the bag feeding suction assembly is aligned with the bag frame d6. The fifth cylinder d2 drives the bag feeding suction assembly to extend and suck the bag body. Then the fifth cylinder d2 drives the bag feeding suction assembly to reset. Then the second servo motor d5 drives the fifth cylinder d2 to rotate through the second belt d4 and the rotating shaft d3. The fifth cylinder d2 drives the bag feeding suction assembly to extend, until the bag opening suction assembly a sucks the bag body, and the bag feeding suction assembly releases the bag body.

[0042] The rack is also provided with a discharge belt e distributed below the bag opening and suction assembly a, both ends of the discharge belt e are linked with roller shafts, a group of roller shafts are linked with a third servo motor e1 through a chain wheel transmission assembly, and the side edge of the discharge belt e is provided with a baffle e2. The third servo motor e1 drives the discharge belt e to rotate through the roller shafts, and automatically transports the completed packaging and heat-sealed packaging bag away.

[0043] The specific working principle of the embodiment is as follows: first, the bag feeding mechanism d feeds the packaging bag to the position of the bag opening and suction assembly a through the linkage of the fifth cylinder d2, the rotating shaft d3, the second belt d4 and the second servo motor d5, realizing the bag feeding operation. Secondly, the bag opening and suction assembly a is driven by the driving assembly to make the bag opening nozzle a1 close to the surface of the packaging bag and suck the bag body, realizing the bag opening operation. At the same time, the side positioning assembly b cooperates with the opening and closing driving mechanism and the moving driving mechanism to make the clamp plate b1 clamp the side edge of the packaging bag, avoiding the bag body from deflecting during the bag opening. During the bag opening process, when the clamp plate b1 clamps the side edge of the bag body, the moving driving mechanism will gradually drive the clamp plate b1 to move towards the center of the bag body. At this time, the clamp plate b1 does not loosen the side edge of the bag body, which adapts to the shape change of the bag opening, avoiding the bag opening from being stretched too much. Until the bag is filled with products, the bag opening and suction assembly seals the bag opening. At the same time, the moving driving mechanism will gradually drive the clamp plate b1 to move away from the center of the bag body, gradually reset until the bag opening is closed. The bag opening heat sealing mechanism c is driven by the third cylinder c3 and the fourth cylinder c4 to make the copper knife c1 and the plastic strip c2 heat seal the bag opening after the bag opening is closed. After heat sealing, the bag body falls onto the discharge belt e, and the discharge belt e drives the packaging bag which has completed the bag opening and heat sealing operation to the subsequent process through the third servo motor e1, and the baffle e2 ensures the stability of the packaging bag during the conveying process.

Claims

1. A bag opening device of a packaging machine, comprising a frame, two groups of bag opening suction assemblies symmetrically arranged and capable of sucking a bag surface respectively, the bag opening suction assemblies are linked with a driving assembly capable of driving the bag opening suction assemblies to reciprocate towards the bag surface, characterized in that: The side edge positioning assembly is arranged on the side edges of the bag and can reciprocate towards the side edges of the bag.

2. The packaging machine opening device according to claim 1, characterized in that: The side edge positioning assembly comprises two groups of symmetrical clamps, an opening and closing driving mechanism for controlling the opening and closing of the two groups of clamps, and a moving driving mechanism connected to the clamps and capable of driving the clamps to reciprocate towards the side edges of the bag.

3. The packaging machine opening device according to claim 2, characterized in that: The opening and closing driving mechanism comprises a finger air cylinder, a first cylinder seat connected to the finger air cylinder, a first air cylinder connected to the first cylinder seat, a lifting cross plate fixedly connected to the body of the first air cylinder, and end portions of the lifting cross plate connected to the moving driving mechanism.

4. The packaging machine opening device according to claim 3, characterized in that: The moving driving mechanism comprises a first belt, a first servo motor, a connecting block fixedly connected to the first belt, a first sliding block connected to the end portions of the lifting cross plate, a first sliding rail in sliding fit with the first sliding block, and the first sliding rail and the first belt being parallel to each other.

5. The packaging machine opening device according to any one of claims 1 to 4, characterized in that: The bag opening and suction assembly comprises a bag opening suction nozzle and a connecting rod connected to the bag opening suction nozzle, a positioning ring in sliding fit with the connecting rod, a limiting step arranged at the end portion of the connecting rod close to the positioning ring, a spring sleeved on the outer periphery of the connecting rod, and the two ends of the spring being in abutting connection with the positioning ring and the suction nozzle respectively.

6. The packaging machine opening device according to claim 5, characterized in that: The driving assembly comprises a first mounting plate and a second air cylinder connected to the first mounting plate, and the positioning ring is clamped in the strip-shaped hole of the first mounting plate.

7. The packaging machine opening device according to any one of claims 1 to 4, characterized in that: The rack further comprises a bag opening above the bag opening and suction assembly, and the bag opening comprises symmetrically arranged copper knives and plastic strips.

8. The packaging machine opening device according to any one of claims 1 to 4, characterized in that: The rack further comprises a bag feeding mechanism, and the bag feeding mechanism comprises a bag feeding suction assembly and a second mounting plate connected to the bag feeding suction assembly.

9. The packaging machine opener according to any of claims 1 to 4, characterized in that: The rack further comprises a discharge belt arranged below the bag opening and suction assembly, and the two ends of the discharge belt are connected to roller shafts. The discharge belt is connected to a third servo motor through a chain wheel transmission assembly, and the side edges of the discharge belt are provided with baffle plates.

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