Automatic conveying device for plastic bag production and working method thereof

Abstract

The invention relates to the technical field of automatic packaging, and discloses an automatic conveying device for plastic bag production and a working method thereof.The automatic conveying device comprises a sealing and cutting device arranged on the side face of a fixing frame, a conveyor, a transmission mechanism, a roller shaft, a tension frame, a color code electric eye, a material rolling device and a date coding machine; a bending plate and a clamping plate are opened and closed up and down under rotation of a motor rod and a threaded rod, rubber strips rotate and flatten the upper side and the lower side of a packaging bag, and under continuous rotation of a round rod, one end of the packaging bag is prevented from falling after sealing and cutting; bending plates and clamping plates are gradually close to the upper side and the lower side of the packaging bag from the outer side, so that the packaging bag is prevented from being blocked, packaging bag folding caused by blocking is avoided, the situation that follow-up bagging is affected by packaging bag folding conveying is avoided, and when a second rotating rod drives a conveying belt to conduct transmission, pressing sliding of a compression plate avoids too large friction force generated by conveying of the conveying belt; and a gap generated on the inner side when the conveying belt moves is prevented from influencing the adsorption of the packaging bag from the vent holes by negative pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of automated packaging, and specifically to an automated conveying device for plastic bag production and its working method. Background Art

[0002] Before packaging plastic bags, it is necessary to pull out the packaging bags on the material roll, seal and cut one side of the packaging bag, and then place it on the conveyor belt and transfer it to the bagging position. When conveying the packaging bag, one end of the packaging bag needs to be sealed and cut. Therefore, after sealing and cutting, it is necessary to fix the packaging bag to prevent the packaging bag from rebounding to the material roll under tension. However, when the conveying mechanism clamps and fixes one end of the packaging bag, since there is a certain distance between the sealing and cutting position and the fixing position of the packaging bag, one end of the packaging bag is likely to droop slightly after sealing and cutting. When the conveying mechanism clamps, it moves horizontally to the lower side of the packaging bag and clamps it from the upper side of the packaging bag. During the horizontal movement, the clamping plate is likely to touch the slightly drooping packaging bag, which easily causes the packaging bag to fold. Subsequently, when the conveying mechanism clamps the packaging bag, the packaging bag is likely to fold, affecting subsequent bagging. Summary of the Invention

[0003] The present invention provides an automated conveying device for plastic bag production and its working method, which overcomes the deficiencies described in the background art.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: An automated conveying device for plastic bag production includes a sealing and cutting device, a conveyor, a transmission mechanism, a roller shaft, a tension frame, a color mark electric eye, a material roll device, and a date coding machine arranged on the side of a fixed frame. The conveyor is located directly below the transmission mechanism. The packaging bag extends to the tension frame at the material roll device position, and the packaging bag surrounds the tension frame and is guided in the direction of the roller shaft. The sealing and cutting device horizontally pulls the packaging bag on the roller shaft. During the pulling process, the date coding machine and the color mark electric eye respectively perform laser coding on the packaging bag, and the packaging bag passes through the inside of the sealing and cutting device; The sealing and cutting device is provided with a bag pulling support rod, a bag pulling motor, a clamping mechanism, and a support plate. The clamping mechanism is arranged at the lower end of the bag pulling support rod. The bag pulling motor is arranged on the side of the clamping mechanism. The bag pulling support rod is fixed to the side of the fixed frame through the support plate; The conveyor is provided with a conveying mechanism and a conveyor belt. An electric motor is arranged at the outer end of the conveying mechanism. The output end of the motor rotates inside the conveying mechanism. The output end of the motor driven by an electric signal drives the conveyor belt outside the conveying mechanism to drive. And the electric signal drives the bag pulling motor to open and close the clamping mechanism, and pulls one end of the packaging bag on the sealing and cutting device, so that the packaging bag is pulled to directly above the conveyor belt. When the clamping mechanism pulls the packaging bag, the clamping mechanism opens and closes up and down to fix the packaging bag and linearly pulls it at the lower end of the bag pulling support rod.

[0005] A preferred technical solution: The clamping mechanism is provided with a limit block, a threaded rod, a bent plate, a connecting block, a clamping plate, a motor rod and a bearing plate. The limit block is fixed inside the bearing plate. A plurality of gear motors are arranged inside the limit block, and the gear motors are in meshing transmission with the tooth blocks arranged at the lower end of the bag-pulling support rod. The connecting block is fixed on the side of the bearing plate. The motor rod is connected to the output end of the bag-pulling motor inside the connecting block. The threaded rod rotates meshingly with the motor rod inside the connecting block. The bent plate and the clamping plate open and close up and down.

[0006] A preferred technical solution: The clamping plate is provided with an electric wire, a rotating shaft and a rotating plate. A small motor is arranged inside the rotating plate. The output ends of the small motor are respectively connected to the middle of the three rotating shafts. The small motor is connected in series with the bag-pulling motor through the electric wire by an electric signal. When the clamping plate and the bent plate open and close, the small motor inside the rotating shaft is driven by an electric signal and drives the rotating shaft to rotate counterclockwise to contact the packaging bag.

[0007] A preferred technical solution: The rotating shaft is provided with a round rod, a rubber strip, a first rotating rod and a deformation ring. The rubber strip is arranged on the outside of the deformation ring. The first rotating rod is arranged on the outside of the deformation ring. The deformation ring fits on the outside of the first rotating rod. The round rod rotates counterclockwise and drives the rubber strip on the outside of the deformation ring to guide the packaging bag.

[0008] A preferred technical solution: When the sealing cutter performs sealing and cutting, it can press and fix the packaging bag. When the clamping mechanism clamps one side of the packaging bag, the packaging bag is fixed by pressing the material through the sealing cutter. As the clamping mechanism clamps the packaging bag, the sealing cutter releases the fixation of the packaging bag.

[0009] A preferred technical solution: The conveying mechanism is provided with a sealing plate, a second rotating rod, a vacuum pump and a fixing plate. The sealing plate is arranged on the upper side of the vacuum pump, and the vacuum pump is fixed inside the middle of the fixing plate. The second rotating rod is fixed inside the fixing plate, and the vacuum pump is connected to the output end of an external motor. The second rotating rod rotates to drive the conveyor belt, so that the conveyor belt slides on the upper side of the sealing plate. The conveyor belt is provided with equally spaced round holes. The vacuum pump is driven by an electric signal to generate negative pressure to adsorb the sealing plate, and the sealing plate adsorbs the packaging bag through the round holes on the conveyor belt.

[0010] A preferred technical solution: The sealing plate is provided with a hollow plate, a ventilation hole and a compression plate. The compression plate is arranged at the upper end of the hollow plate. The ventilation hole penetrates through the hollow plate and the compression plate. When the vacuum pump generates negative pressure to adsorb, it adsorbs through the ventilation hole from the corresponding round holes on the conveyor belt, and the conveyor belt slides against the surface of the compression plate when it moves.

[0011] Based on the above working method of an automatic conveying device for plastic bag production, the working method includes the following specific steps: S1: The packaging bag is pulled from the material reel to the tension frame and the roller shaft by the transmission mechanism. During the pulling process, the date coding machine and the color mark electric eye perform laser coding on the packaging bag. After the sealing cutter seals and cuts the passing packaging bag, the packaging bag is released by the transmission mechanism and drops onto the conveyor for adsorption. The electric signal drives the conveyor to drive, and the packaging bag on the surface of the conveyor is driven to the bagging position. S2: When the transmission mechanism pulls the packaging bag, the electric signal drives the bag-pulling motor to close the clamping mechanism and clamp one end of the packaging bag. Thus, the clamping mechanism linearly moves under the bag-pulling support rod to directly above the conveyor belt. S3: After the packaging bag directly above the conveyor belt is sealed and cut by the sealing cutter, the electric signal drives the bag-pulling motor to rotate in the reverse direction, and the clamping mechanism releases the clamping of the packaging bag, causing the packaging bag to drop onto the surface of the conveyor belt for negative pressure adsorption. S4: After the conveyor belt adsorbs the packaging bag on its surface and drives it to the bagging position, it stops driving, causing the clamping mechanism to repeat the process of clamping the packaging bag and pulling it out from the position of the sealing cutter, and releasing the clamping after the packaging bag is sealed and cut, dropping it onto the surface of the conveyor belt for adsorption again.

[0012] Compared with the prior art, the present technical solution has the following advantages: In the present invention, the bending plate and the clamping plate open and close up and down respectively under the rotation of the motor rod and the threaded rod. During the opening and closing process, the electric signal through the wire drives the small motor in the rotating plate to work, and the rotating shaft rotates counterclockwise to guide the packaging bag with uneven position at the sealing cutter. The small motor drives multiple rotating shafts to rotate. When the bending plate and the clamping plate open and close, the rubber strip rotates and smooths the upper and lower sides of the packaging bag, and under the continuous rotation of the round rod, it prevents one end of the packaging bag from dropping after being sealed and cut. The clamping method in which the bending plate and the clamping plate gradually approach the upper and lower sides of the packaging bag from the outside prevents the packaging bag from being blocked, avoids the packaging bag from being folded due to the blockage, and prevents the folded transmission of the packaging bag from affecting the subsequent bagging.

[0013] In the present invention, the fixed vacuum pump generates a negative pressure adsorption force, and generates negative pressure into the vacuum pump through the ventilation holes to adsorb the packaging bag. When the second rotating rod drives the conveyor belt to drive, the inner side of the conveyor belt presses and slides on the compression plate on the surface of the sealing plate, and the pressing and sliding of the compression plate avoid excessive frictional force generated by the driving of the conveyor belt, preventing the inner side from generating gaps when the conveyor belt moves and affecting the adsorption of the packaging bag by the negative pressure from the ventilation hole position. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 It is the overall view of the present invention.

[0016] Figure 2 It is the three-dimensional schematic diagram of the conveyor and the transmission mechanism.

[0017] Figure 3 It is a side schematic view of the clamping mechanism.

[0018] Figure 4 It is a side schematic view of the clamping plate.

[0019] Figure 5 It is a three-dimensional schematic view of the rotating shaft.

[0020] Figure 6 It is a side schematic view of the conveying mechanism.

[0021] Figure 7 It is a three-dimensional schematic view of the sealing plate.

[0022] In the figure: sealing cutter - 1, conveyor - 2, transmission mechanism - 3, fixed frame - 4, roller shaft - 5, tension frame - 6, color mark photoelectric eye - 7, material roll device - 8, date coding machine - 9.

[0023] Bag pulling strut - 31, bag pulling motor - 32, clamping mechanism - 33, support plate - 34, conveying mechanism - 21, conveyor belt - 22.

[0024] Limit block - 131, threaded rod - 132, bent plate - 133, connecting block - 134, clamping plate - 135, motor rod - 136, load - bearing plate - 137.

[0025] Electric wire - 51, rotating shaft - 52, rotating plate - 53, round rod - 521, rubber strip - 522, first rotating rod - 523, deformation ring - 524.

[0026] Sealing plate - 211, second rotating rod - 212, vacuum pump - 213, fixing plate - 214, hollow plate - 2111, ventilation hole - 2112, compression plate - 2113. Specific implementation manner

[0027] As Figures 1 to 7 shown, an automatic conveying device for plastic bag production and its working method are proposed in the present invention, including a sealing cutter 1, a conveyor 2, a transmission mechanism 3, a roller shaft 5, a tension frame 6, a color mark photoelectric eye 7, a material roll device 8 and a date coding machine 9 arranged on the side of the fixed frame 4. The conveyor 2 is located directly below the transmission mechanism 3. The packaging bag extends to the tension frame 6 at the position of the material roll device 8, and the packaging bag surrounds and guides the conveying direction of the roller shaft 5 on the tension frame 6. The sealing cutter 1 horizontally pulls the packaging bag on the roller shaft 5. During the pulling, the date coding machine 9 and the color mark photoelectric eye 7 respectively perform laser coding on the packaging bag, and the packaging bag passes through the inside of the sealing cutter 1; The sealing cutter 1 is provided with a bag pulling rod 31, a bag pulling motor 32, a clamping mechanism 33 and a support plate 34. The clamping mechanism 33 is arranged at the lower end of the bag pulling rod 31. The bag pulling motor 32 is arranged on the side of the clamping mechanism 33. The bag pulling rod 31 is fixed to the side of the fixing frame 4 through the support plate 34. The conveyor 2 is provided with a conveying mechanism 21 and a conveyor belt 22. An electric motor is arranged at the outer end of the conveying mechanism 21. The output end of the motor rotates inside the conveying mechanism 21. The electric signal drives the output end of the motor to drive the conveyor belt 22 outside the conveying mechanism 21 to transmit. And the electric signal drives the bag pulling motor 32 to open and close the clamping mechanism 33, and pulls one end of the packaging bag on the sealing cutter 1, so that the packaging bag is pulled to directly above the conveyor belt 22. When the clamping mechanism 33 pulls the packaging bag, the clamping mechanism 33 opens and closes up and down to fix the packaging bag and linearly pulls it at the lower end of the bag pulling rod 31.

[0028] Moreover, the clamping mechanism 33 is provided with a limiting block 131, a threaded rod 132, a bent plate 133, a connecting block 134, a clamping plate 135, a motor rod 136 and a bearing plate 137. The limiting block 131 is fixed inside the bearing plate 137. A plurality of gear motors are arranged inside the limiting block 131. The gear motors are meshed and transmitted with the tooth blocks arranged at the lower end of the bag pulling rod 31. The connecting block 134 is fixed to the side of the bearing plate 137. The motor rod 136 is connected to the output end of the bag pulling motor 32 inside the connecting block 134. The threaded rod 132 rotates meshingly with the motor rod 136 inside the connecting block 134. The bent plate 133 and the clamping plate 135 open and close up and down.

[0029] Moreover, the tension frame 6 has a certain elastic rotation effect on the winding of the reel 8. And a cylinder is arranged on the sealing cutter 1 to fix the sealed packaging bag and releases the fixation on the packaging bag when pulling the packaging bag.

[0030] In the present invention, the electric signal drives the bag pulling motor 32, and makes the output end motor rod 136 of the bag pulling motor 32 rotate clockwise, drives the threaded rod 132 to rotate counterclockwise, makes the bent plate 133 and the clamping plate 135 rotate in the opposite direction and clamp the packaging bag at the position of the sealing cutter 1. After the clamping is completed, the limiting block 131 rotates meshingly on the tooth block on the lower side of the bag pulling rod 31, makes the limiting block 131 drive the bearing plate 137 to linearly move on the lower side of the bag pulling rod 31, and pulls one end of the packaging bag to move above the conveyor belt 22. Thus, after the sealing cutter 1 seals the packaging bag, the clamping mechanism 33 releases the clamping on the packaging bag, and the conveyor belt 22 adsorbs the packaging bag by negative pressure and transmits it to the bagging position.

[0031] Among them, the clamping plate 135 is provided with a wire 51, a rotating shaft 52 and a rotating plate 53. A small motor is arranged inside the rotating plate 53. The output ends of the small motor are respectively connected to the middle of the three rotating shafts 52. The small motor is connected in series with the bag pulling motor 32 through the electrical signal of the wire 51. When the clamping plate 135 and the bending plate 133 open and close, the small motor inside the rotating shaft 52 is driven by an electrical signal and drives the rotating shaft 52 to rotate counterclockwise to contact the packaging bag.

[0032] Among them, the rotating shaft 52 is provided with a round rod 521, a rubber strip 522, a first rotating rod 523 and a deformation ring 524. The rubber strip 522 is arranged on the outer side of the deformation ring 524. The first rotating rod 523 is arranged on the outer side of the deformation ring 524. The deformation ring 524 fits on the outer side of the first rotating rod 523. The round rod 521 rotates counterclockwise and drives the rubber strip 522 on the outer side of the deformation ring 524 to guide the packaging bag. When the bending plate 133 and the clamping plate 135 are pressed against each other, the rubber strip 522 on the outer side of the deformation ring 524 bends and elastically presses against the bending plate 133.

[0033] In the present invention, the bending plate 133 and the clamping plate 135 open and close up and down respectively under the rotation of the motor rod 136 and the threaded rod 132. During the opening and closing process, the electrical signal of the wire 51 drives the small motor inside the rotating plate 53 to work, and makes the rotating shaft 52 rotate counterclockwise to guide the packaging bag with uneven position at the sealing cutter 1. The small motor drives a plurality of rotating shafts 52 to rotate. When the bending plate 133 and the clamping plate 135 open and close, the rubber strip 522 rotates and smooths the upper and lower sides of the packaging bag, and under the continuous rotation of the round rod 521, it prevents one end of the packaging bag from drooping after sealing and cutting. The clamping method that the bending plate 133 and the clamping plate 135 gradually approach the upper and lower sides of the packaging bag from the outside prevents the packaging bag from being blocked, avoids the packaging bag from being folded due to the blockage, and prevents the folded and conveyed packaging bag from affecting the subsequent bagging.

[0034] Moreover, when the sealing cutter 1 seals and cuts, it can press and fix the packaging bag. When the clamping mechanism 33 clamps one side of the packaging bag, the packaging bag is pressed and fixed by the sealing cutter 1. As the clamping mechanism 33 clamps the packaging bag, the sealing cutter 1 releases the fixation of the packaging bag.

[0035] Moreover, the conveying mechanism 21 is provided with a sealing plate 211, a second rotating rod 212, a vacuum pump 213 and a fixing plate 214. The sealing plate 211 is arranged on the upper side of the vacuum pump 213, and the vacuum pump 213 is fixed inside the middle of the fixing plate 214. The second rotating rod 212 is fixed inside the fixing plate 214, and the vacuum pump 213 is connected to the output end of an external motor. The second rotating rod 212 rotates to drive the conveyor belt 22, so that the conveyor belt 22 slides on the upper side of the sealing plate 211. The conveyor belt 22 is provided with equidistantly distributed round holes. The vacuum pump 213 is driven by an electrical signal to adsorb the sealing plate 211 negatively, and the sealing plate 211 adsorbs the packaging bag through the round holes on the conveyor belt 22.

[0036] Among them, the sealing plate 211 is provided with a hollow plate 2111, ventilation holes 2112 and a compression plate 2113. The compression plate 2113 is arranged at the upper end of the hollow plate 2111. The ventilation holes 2112 penetrate through the hollow plate 2111 and the compression plate 2113. When the vacuum pump 213 generates negative pressure adsorption, it adsorbs through the ventilation holes 2112 from the corresponding round holes of the conveyor belt 22, and when the conveyor belt 22 is driven, it slides against the surface of the compression plate 2113.

[0037] Moreover, the compression plate 2113 is made of sponge material and has an effect of easy sliding on the surface. When the compression plate 2113 presses against the inner side of the conveyor belt 22, the compression plate 2113 slides and presses against the inner side of the conveyor belt 22. When pressing, the compression plate 2113 compresses and increases in density, forming a sealing effect.

[0038] In the present invention, the fixed vacuum pump 213 generates a negative pressure adsorption force, and generates negative pressure into the vacuum pump 213 through the ventilation holes 2112 to adsorb the packaging bag. When the second rotating rod 212 drives the conveyor belt 22 to move, the inner side of the conveyor belt 22 slides against the compression plate 2113 on the surface of the sealing plate 211. The sliding of the compression plate 2113 against the pressure avoids excessive frictional force generated by the movement of the conveyor belt 22, and prevents gaps from being generated on the inner side when the conveyor belt 22 moves, which affects the adsorption of the packaging bag by the negative pressure from the position of the ventilation holes 2112.

[0039] Based on the working method of the above-mentioned automatic conveying device for plastic bag production, the working method includes the following specific steps: S1: The packaging bag is pulled from the reel 8 to the tension frame 6 and the roller 5 by the transmission mechanism 3. During the pulling process, the date coding machine 9 and the color mark photoelectric eye 7 perform laser coding on the packaging bag. After the sealing cutter 1 seals and cuts the passing packaging bag, the packaging bag is released by the transmission mechanism 3 and falls onto the conveyor 2 for adsorption. The conveyor 2 is driven by an electric signal, and the packaging bag on the surface of the conveyor 2 is driven to the bagging position. S2: When the transmission mechanism 3 pulls the packaging bag, the electric signal drives the bag pulling motor 32 to close the clamping mechanism 33 and clamp one end of the packaging bag, so that the clamping mechanism 33 linearly moves to directly above the conveyor belt 22 under the bag pulling support rod 31. S3: After the packaging bag directly above the conveyor belt 22 is sealed and cut by the sealing cutter 1, the electric signal drives the bag pulling motor 32 to rotate in the reverse direction, and the clamping mechanism 33 releases the clamping of the packaging bag, so that the packaging bag falls onto the surface of the conveyor belt 22 for negative pressure adsorption. S4: After the conveyor belt 22 adsorbs the packaging bag on its surface and drives it to the bagging position, it stops driving, so that the clamping mechanism 33 repeats the process of clamping the packaging bag and pulling it out from the position of the sealing cutter 1, and releases the clamping after the packaging bag is sealed and cut and falls onto the surface of the conveyor belt 22 for adsorption again.

[0040] The above are only the preferred embodiments of the present invention, and thus the scope of implementation of the present invention cannot be limited thereby. That is, equivalent changes and modifications made according to the scope of the present invention patent and the content of the specification should still fall within the scope covered by the present invention.

Claims

1. An automatic conveying device for plastic bag production, characterized in that: The packaging bag comprises a sealer (1), a conveyor (2), a transmission mechanism (3), a roller (5), a tension frame (6), a color mark electric eye (7), a material reel (8) and a date coder (9) arranged on the side of a fixed frame (4), wherein the conveyor (2) is located directly below the transmission mechanism (3), the packaging bag extends to the tension frame (6) at the position of the material reel (8), and the packaging bag is wrapped around the tension frame (6) and guided in the direction of the roller (5); The sealer (1) is provided with a bag-pulling support rod (31), a bag-pulling motor (32), a clamping mechanism (33) and a support plate (34); the clamping mechanism (33) is arranged at the lower end of the bag-pulling support rod (31); the bag-pulling motor (32) is arranged on the side of the clamping mechanism (33); and the bag-pulling support rod (31) is fixed to the side of the fixing frame (4) via the support plate (34); The conveyor (2) is provided with a conveying mechanism (21) and a conveying belt (22); a motor is provided at the outer end of the conveying mechanism (21); and an output end of the motor drives the conveying belt (22); The clamping mechanism (33) is provided with a limit block (131), a threaded rod (132), a bending plate (133), a connecting block (134), a clamping plate (135), a motor rod (136) and a load-bearing plate (137); the limit block (131) is fixed inside the load-bearing plate (137); a plurality of gear motors are provided inside the limit block (131); the gear motors mesh with a tooth block provided at the lower end of the bag pulling support rod (31) for transmission; the connecting block (134) is fixed on the side of the load-bearing plate (137); the motor rod (136) is connected to the output end of the bag pulling motor (32) inside the connecting block (134); the threaded rod (132) meshes and rotates with the motor rod (136) inside the connecting block (134); the bending plate (133) and the clamping plate (135) open and close up and down.

2. The automatic conveying device for plastic bag production according to claim 1, characterized in that: The clamping plate (135) is provided with an electric wire (51), a rotating shaft (52) and a rotating plate (53); a small motor is provided inside the rotating plate (53); the output ends of the small motor are respectively connected to the middle of the three rotating shafts (52); the small motor is connected in series to the bag pulling motor (32) via an electric signal of the electric wire (51); when the clamping plate (135) and the bending plate (133) are opened or closed, the small motor inside the rotating shaft (52) is driven by the electric signal and drives the rotating shaft (52) to rotate counterclockwise to contact the packaging bag.

3. The automatic conveying device for plastic bag production according to claim 2, characterized in that: The rotating shaft (52) is provided with a round rod (521), a rubber strip (522), a first rotating rod (523) and a deformation ring (524); the rubber strip (522) is arranged outside the deformation ring (524); the first rotating rod (523) is arranged outside the deformation ring (524); the deformation ring (524) is attached to the outside of the first rotating rod (523); the round rod (521) rotates counterclockwise and drives the rubber strip (522) outside the deformation ring (524) to guide the packaging bag.

4. The automatic conveying device for plastic bag production according to claim 3, characterized in that: The conveying mechanism (21) is provided with a sealing plate (211), a second rotating rod (212), a vacuum pump (213) and a fixed plate (214); the sealing plate (211) is arranged on the upper side of the vacuum pump (213), and the vacuum pump (213) is fixed inside the middle of the fixed plate (214); the second rotating rod (212) is fixed inside the fixed plate (214), and the vacuum pump (213) is connected to an external motor output end; the second rotating rod (212) rotates to drive the conveyor belt (22) so that the conveyor belt (22) slides on the upper side of the sealing plate (211); the conveyor belt (22) is provided with equidistantly distributed circular holes; an electrical signal drives the vacuum pump (213) to negatively pressure the sealing plate (211); The sealing plate (211) is provided with a hollow plate (2111), a ventilation hole (2112) and a compression plate (2113); the compression plate (2113) is arranged at the upper end of the hollow plate (2111); and the ventilation hole (2112) penetrates the hollow plate (2111) and the compression plate (2113).

5. A working method of an automatic conveying device for producing plastic bags, applied to the automatic conveying device for producing plastic bags according to claim 4, characterized in that: The specific working method is as follows: S1: The packaging bag is pulled out from the material reel (8) to the tension frame (6) and the roller (5) under the pulling of the transmission mechanism (3). During the pulling process, the date coding machine (9) and the color code electric eye (7) laser code the packaging bag. After the sealing and cutting device (1) seals and cuts the passing packaging bag, the packaging bag is released by the transmission mechanism (3) and falls onto the conveyor (2) for adsorption. The electrical signal drives the conveyor (2) to transmit, and the packaging bag on the surface of the conveyor (2) is transmitted to the bagging position. S2: When the transmission mechanism (3) pulls the packaging bag, an electrical signal drives the bag pulling motor (32) to close the clamping mechanism (33) and clamp one end of the packaging bag, so that the clamping mechanism (33) moves linearly under the bag pulling support rod (31) to just above the conveyor belt (22); S3: After the packaging bag directly above the conveyor belt (22) is sealed and cut by the sealer (1), an electrical signal drives the bag pulling motor (32) to rotate in the opposite direction, and causes the clamping mechanism (33) to release the clamping of the packaging bag, so that the packaging bag falls onto the surface of the conveyor belt (22) and is adsorbed by negative pressure; S4: After the packaging bag is adsorbed onto the surface of the conveyor belt (22), it is transmitted to the bagging position and then stops transmitting, so that the clamping mechanism (33) repeatedly clamps the packaging bag from the position of the sealer (1) and pulls it out, and after the packaging bag is sealed and cut, the clamping is released and it falls onto the surface of the conveyor belt (22) and is adsorbed again.

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