A transport assembly for cloth bag lining production

Abstract

The application relates to the technical field of material conveying equipment, in particular to a conveying assembly for cloth bag lining production, which comprises a centralized conveying belt and a mounting table, the mounting table is arranged directly above the centralized conveying belt, a plurality of feeding conveying belts for conveying cloth bag linings are arranged on the mounting table, a material guiding cylinder for guiding the cloth bag linings to shift to the centralized conveying belt is movably arranged at the center position of the mounting table; in the rotating process of the material guiding cylinder, the feeding port is opened, the cloth bag linings blocked by the rotating plate on the single feeding conveying belt are shifted to the top end of the discharging table in the rotating process of the material guiding cylinder and slide into the material guiding cylinder, and the cloth bag linings are guided to fall on the centralized conveying belt through the material guiding cylinder, so that the cloth bag linings are not simultaneously shifted to the centralized conveying belt by the plurality of feeding conveying belts, a large amount of cloth bag linings are not accumulated together, and the cloth bag linings are not easily fallen from the centralized conveying belt in the conveying process.

Description

Technical Field

[0001] This invention relates to the field of material transport equipment technology, specifically a transport component for the production of cloth bag liners. Background Technology

[0002] Fabric linings are a type of material used to protect the contents of collapsible crates. Since collapsible crates are often used to transport large and fragile items, fabric linings can increase stability during transportation. They are usually made of flexible materials with a certain strength, such as polypropylene and high-density polyethylene, and are installed tightly against the inside of the crate. During the production process of fabric linings, intelligent overhead conveyor systems are generally used to transport raw materials. After the raw materials are processed into finished fabric linings, they are transported to a designated location for centralized storage via transport components.

[0003] Because multiple production lines often operate simultaneously during the production of fabric bag liners, the produced liners are transported via conveyor belts. However, since the storage location of the liners is often far from the production line, multiple conveyor belts gather the liners together before transporting them to the storage location via a separate conveyor belt. During this process, the liners from multiple conveyor belts often fall directly onto the separate conveyor belt. This working method easily leads to the liners from multiple conveyor belts falling onto the separate conveyor belt at the same time, and they are also prone to slipping off the separate conveyor belt during movement, which needs to be improved. Summary of the Invention

[0004] The purpose of this invention is to provide a transport assembly for the production of fabric bag liners, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a transport assembly for producing fabric bag liners, comprising a centralized conveyor belt and an installation platform. The installation platform is positioned directly above the centralized conveyor belt, and several feeding conveyor belts for conveying fabric bag liners are provided on the installation platform. A guide cylinder for guiding the fabric bag liners to the centralized conveyor belt is movably placed at the center of the installation platform. A placement platform is provided directly above the installation platform, and the placement platform is connected to the installation platform by four first hydraulic push rods. An installation frame is fixedly installed on the placement platform, and a rotary motor for driving the guide cylinder to rotate is provided on the installation frame. A connecting frame is connected to the rotary motor, and the connecting frame is fixedly installed on the inner wall of the guide cylinder. An inlet for guiding the fabric bag liners into its interior is provided on the outer wall of the guide cylinder. Several guide plates and fixing frames for restricting the movement of the fabric bag liners are provided on the installation platform, and the guide plates are connected to the installation platform by uprights.

[0006] A horizontal plate is provided on the outer wall of the guide cylinder, and a toggle plate is provided on the horizontal plate. A rotating shaft is rotatably mounted on the guide plate. A linkage plate and a first push plate for cooperating with the toggle plate are fixedly mounted on the rotating shaft. A protrusion is provided on the fixed frame, and a translation rod that can move with the first push plate is movably mounted on the protrusion. A translation plate is connected to the translation rod, and a second push plate for pushing the inner lining of the bag is fixedly mounted on the translation plate.

[0007] A fixing plate for blocking the inner lining of the cloth bag is fixedly installed on the fixing frame.

[0008] The guide plate is rotatably mounted with a rotating plate for fitting and fixing the plate, and the rotating plate is mounted with a positioning block for limiting the movement space of the rotating plate.

[0009] The second push plate is connected to a baffle for blocking the gap between the fixing frame and the second push plate.

[0010] The mounting platform is equipped with several unloading platforms, each equipped with rollers for guiding the movement of the bag lining.

[0011] A vertical plate is installed at the top of the fixed frame, and a material blocking assembly is provided on the vertical plate. The material blocking assembly includes an extension platform, a fixed rod is provided on the extension platform, a telescopic rod is provided on the fixed rod, and a linkage block is provided on the telescopic rod.

[0012] A sliding groove is provided on the outer wall of the guide cylinder, and a sliding plate is slidably installed in the sliding groove. A baffle plate for blocking the feed inlet is provided on the sliding plate, and a toggle block for cooperating with the linkage block is provided on the sliding plate.

[0013] The sliding plate is connected to the inner wall of the sliding groove by a connecting spring.

[0014] The fixed plate is provided with a translation groove, and a slider is slidably installed in the translation groove. The slider is fixedly installed at the bottom end of the translation plate, and the slider is connected to the inner wall of the translation groove by a second return spring.

[0015] A circular ring is provided directly above the guide cylinder, and two lifting rods are provided at the bottom end of the circular ring. The bottom ends of the two lifting rods are connected to a pressure plate. The circular ring and the connecting frame are connected by two first return springs.

[0016] Several rollers are provided on the parts where the rotating plate and the second push plate are in contact with each other to reduce the friction between the two and the inner lining of the bag.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This invention opens the feed inlet during the rotation of the guide cylinder, transferring the bag liner blocked by the rotating plate on a single feed conveyor belt to the top of the unloading platform and sliding into the guide cylinder. The guide cylinder then guides the bag liner to fall onto the centralized conveyor belt. This avoids the problem of multiple feed conveyor belts simultaneously transferring bag liner to the centralized conveyor belt, which would cause a large amount of bag liner to accumulate and easily fall off the centralized conveyor belt during transport.

[0019] By actuating the lever plate to rotate the linkage plate, the first push plate rotates synchronously and contacts the translation rod. The translation rod drives the translation plate to move in the translation groove. During the movement, the translation plate pushes the rotating plate to rotate through the sticking rod, opening the gap between the rotating plate and the fixed plate, so that the bag liner can move through the gap to the top of the unloading platform, so that the bag liner can move in an orderly manner to the unloading platform to wait for transfer.

[0020] When the rotary motor drives the guide cylinder to rotate counterclockwise, the inclined surfaces on the actuating block and the linkage block come into contact with each other and, during the continuous rotation of the actuating block, the linkage block moves vertically upward through the telescopic rod. While the linkage block is blocking the actuating block from moving with the guide cylinder, the sliding plate fixedly connected to the actuating block moves in the sliding groove, causing the feed inlet blocked by the baffle plate to open, and the inner lining of the cloth bag will fall from the feed inlet into the guide cylinder. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the installation structure of the shelf of the present invention.

[0023] Figure 3 This is a schematic diagram of the material guide cylinder installation structure of the present invention.

[0024] Figure 4 This is a schematic diagram of the feeding conveyor belt structure of the present invention.

[0025] Figure 5 This is a schematic diagram of the toggle plate structure of the present invention.

[0026] Figure 6 This is a schematic diagram of the fixing frame structure of the present invention.

[0027] Figure 7 This is a partial structural decomposition diagram of the present invention.

[0028] Figure 8 This is a schematic diagram of the material blocking component structure of the present invention.

[0029] Figure 9 This is a schematic diagram of the material guide cylinder structure of the present invention.

[0030] Figure 10This is an exploded view of the feed cylinder structure of the present invention.

[0031] In the diagram: 1. Centralized conveyor belt; 2. Mounting platform; 3. Feed conveyor belt; 4. Storage platform; 5. First hydraulic push rod; 6. Mounting frame; 7. Rotary motor; 8. Connecting frame; 9. Guide cylinder; 10. Sliding groove; 11. Sliding plate; 12. Connecting spring; 13. Actuating block; 14. Feed inlet; 15. Horizontal plate; 16. Actuating plate; 17. Ring; 18. Lifting rod; 19. Pressure plate; 20. First return spring; 21. Vertical rod; 22. Guide plate; 23. Rotating plate; 24. Positioning block; 25. Fixing frame; 26. Rotating shaft; 27. Linkage plate; 28. First push plate; 29. ​​Protrusion; 30. Translation rod; 31. Fixing plate; 32. Translation plate; 33. Second return spring; 34. Second push plate; 35. Baffle; 36. Vertical plate; 37. Material stop assembly; 38. Extension table; 39. Fixing rod; 40. Telescopic rod; 41. Linkage block; 42. Unloading table; 43. Roller; 44. Material stop plate. Detailed Implementation

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

[0033] Please see Figures 1 to 10 This invention provides a technical solution: a transport assembly for producing fabric bag liners, including a centralized conveyor belt 1 and an installation platform 2. Several feeding conveyor belts 3 are installed at the top of the installation platform 2. The centralized conveyor belt 1 and the feeding conveyor belts 3 are common existing equipment and will not be described in detail again. An opening is provided at the center of the installation platform 2, and a guide cylinder 9 is movably placed in the opening. In actual use, the gap between the guide cylinder 9 and the opening on the installation platform 2 needs to be filled by cutting foam board or other materials to prevent the fabric bag lining from falling out of the gap. A storage platform 4 is provided directly above the installation platform 2. The storage platform 4 is connected to the installation platform 2... The platforms 2 are connected by four first hydraulic push rods 5. A through hole is provided in the center of the platform 4. A rotary motor 7 is placed in the through hole of the platform 4. The rotary motor 7 is connected to an external power source through a line, that is, the rotary motor 7 is started by an external power source. A mounting bracket 6 is provided at the top of the rotary motor 7. The mounting bracket 6 is fixedly connected to the platform 4 and the rotary motor 7 and is used to fix the position of the rotary motor 7. A connecting bracket 8 is fixedly connected to the bottom of the output shaft of the rotary motor 7. The connecting bracket 8 is fixedly installed on the inner wall of the guide cylinder 9 and is used to drive the guide cylinder 9 to rotate during the rotation of the output shaft of the rotary motor 7.

[0034] A feed inlet 14 is provided on the outer wall of the feed cylinder 9. A sliding groove 10 is provided above the feed inlet 14. A sliding plate 11 adapted to it is slidably installed in the sliding groove 10. The sliding plate 11 is connected to the inner wall of the sliding groove 10 by a connecting spring 12. A baffle plate 44 for blocking the feed inlet 14 is fixedly installed at the bottom of the sliding plate 11. Hidden grooves are provided on the outer wall of the sliding plate 11 and the inner wall of the sliding groove 10. Rubber blocks are installed in the hidden grooves. Several anti-slip pleats are provided on the rubber blocks to increase the friction between the sliding plate 11 and the inner wall of the sliding groove 10. The friction between the two should be less than the thrust generated by the connecting spring 12, so that the connecting spring 12 can make the sliding plate 11 move slowly when pushing the sliding plate 11. This avoids the bag liner being directly and quickly reset due to the thrust generated by the connecting spring 12 after the baffle plate 44 fails to block the feed inlet 14, which would cause the baffle plate 44 and the inner wall of the sliding groove 10 to clamp it.

[0035] A circular ring 17 is provided directly above the connecting frame 8. Two lifting rods 18 are provided at the bottom of the circular ring 17. Both lifting rods 18 pass through the connecting frame 8 and extend into the guide cylinder 9. The bottom ends of the two lifting rods 18 are connected to a pressure plate 19. Two first return springs 20 are also fixedly installed between the bottom end of the circular ring 17 and the top end of the connecting frame 8. The bottom end of the pressure plate 19 can be fitted with a protrusion that matches the bottom shape of the guide cylinder 9. When the inner lining of the cloth bag is stuck at the bottom end of the inner cavity of the guide cylinder 9 and cannot fall onto the centralized conveyor belt 1, the circular ring 17 can be pressed downwards by controlling the pressure plate 19 and the protrusion at its bottom end to push the inner lining of the cloth bag out of the bottom end of the inner cavity of the guide cylinder 9 and fall onto the centralized conveyor belt 1.

[0036] Several uprights 21 and fixing frames 25 are installed between several feeding conveyor belts 3 and the guide cylinder 9. The gap between the fixing frame 25 and the guide cylinder 9 should be much smaller than the thickness of the bag liner. The guide cylinder 9 consists of an upright cylinder and a connecting cylinder. The connecting cylinder is rotatably installed at the bottom of the upright cylinder. The connecting cylinder and the highest point of the unloading platform 42 are at the same horizontal height, so that the connecting cylinder can contact the bag liner located at the top of the unloading platform 42. When the bag liner is placed at the top of the unloading platform 42, the bag liner is prevented from getting stuck in the gap between the guide cylinder 9 and the fixing frame 25 due to the overall rotation of the guide cylinder 9. The uprights 21 and fixing frames 25 are fixed. The uprights 21 and the fixed frame 25 are fixedly installed at the top of the mounting platform 2, and the uprights 21 and the fixed frame 25 extend to the top of the feeding conveyor belt 3. A discharge platform 42 is provided between adjacent uprights 21 and fixed frames 25. The discharge platform 42 is fixedly installed at the top of the mounting platform 2, and the top of the discharge platform 42 is provided with several arc-shaped grooves. Rollers 43 are rotatably installed in the arc-shaped grooves. After the bag liner falls from the feeding conveyor belt 3 to the top of the discharge platform 42, the friction between the bag liner and the discharge platform 42 can be reduced by the rollers 43, so that the bag liner can fall into the guide cylinder 9 through the feed port 14.

[0037] A rotating shaft 26 is rotatably mounted on the top of the fixed frame 25. A linkage plate 27 and a first push plate 28 are fixedly mounted on the outer wall of the rotating shaft 26. A limiting block (not shown in the figure) is also fixedly mounted on the top of the fixed frame 25. It is located on the moving track of the linkage plate 27 and is used to limit the moving space of the linkage plate 27. A horizontal plate 15 is fixedly mounted on the outer wall of the guide cylinder 9. A deflecting plate 16 for turning the linkage plate 27 is fixedly mounted on the horizontal plate 15. The bottom end of the deflecting plate 16 is at the same horizontal height as the middle section of the linkage plate 27. That is, when the rotating motor 7 drives the guide cylinder 9 to rotate through the connecting frame 8, the deflecting plate 16 located on the periphery of the guide cylinder 9 rotates synchronously and drives the first push plate 28 to rotate synchronously through the rotating shaft 26.

[0038] The top of the fixed frame 25 is also fixedly installed with a protrusion 29 and a vertical plate 36. A baffle assembly 37 is fixedly installed on the vertical plate 36. The protrusion 29 is provided with a through hole, and a translation rod 30 is movably installed in the through hole. One end of the translation rod 30 is movably attached to the first push plate 28, and the other end is fixedly connected to a translation plate 32. A fixed plate 31 is provided at the bottom of the translation plate 32. The fixed plate 31 is fixedly installed on the fixed frame 25. The top of the fixed plate 31 is provided with a translation groove. A slider is slidably installed inside the sliding groove. The slider is fixedly installed at the bottom end of the translation plate 32, and the slider is connected to the inner wall of the translation groove by a second return spring 33. A limit plate (not shown in the figure) is movably attached to the side wall of the translation plate 32. It is located between the protrusion 29 and the translation plate 32 and is fixedly installed at the top of the fixed plate 31 to prevent the second return spring 33 from excessively contracting, which would cause the translation plate 32 to move too much and affect the next use. A rotating plate 23 is rotatably installed on the guide plate 22. The rotating plate 23 is connected to the guide plate 22 by a torsion spring, which allows the guide plate 22 to reset after use. A positioning block 24 is fixedly installed on the rotating plate 23, which can movably fit against the fixed plate 31 to restrict the rotation of the rotating plate 23. A fitting rod is fixedly installed on the positioning block 24, which movably fits against the translation plate 32. This allows the rotating plate 23 to be displaced during the displacement of the translation plate 32, creating a gap between the rotating plate 23 and the fixed plate 31 to facilitate the passage of the bag lining. Several small rollers are provided on the side of the rotating plate 23 and the fixed plate 31 that are close to each other, which reduces the friction between the rotating plate 23, the fixed plate 31 and the bag lining, and facilitates the passage of the bag lining. In actual use, the shape and size of the rotating plate 23 and the positioning block 24 need to be adjusted according to the size of the bag lining to push the rotating plate 23 to rotate in the limited space of the translation plate 32 and increase the size of the gap that can be opened between it and the fixed plate 31.

[0039] During the rotation of the linkage plate 27 by the actuating plate 16, the first push plate 28 rotates synchronously and contacts the translation rod 30. The translation rod 30 drives the translation plate 32 to move in the translation groove. During the movement, the translation plate 32 pushes the rotating plate 23 to rotate through the sticking rod, opening the gap between the rotating plate 23 and the fixed plate 31, so that the inner lining of the bag can move through the gap to the top of the unloading platform 42.

[0040] A second push plate 34 is fixedly installed on the translation plate 32, and a baffle 35 is fixedly installed on the second push plate 34. The fixing frame 25 is provided with a hidden opening that matches the width and height of the baffle 35. The baffle 35 is movably placed in the hidden opening. During the translation movement of the second push plate 34 following the translation plate 32, it can push the inner lining of the bag that is attached to the fixing plate 31 to move into the gap between the fixing plate 31 and the rotating plate 23. The baffle 35 fixedly installed on the second push plate 34 blocks the gap between the second push plate 34 and the positioning block 24 during the movement, preventing the inner lining of the bag from being easily clamped by the second push plate 34 and the positioning block 24. The outer wall of the baffle 35 is provided with several anti-slip pleats to increase the friction between the baffle 35 and the inner wall of the hidden opening on the fixing frame 25, preventing the translation plate 32 from moving quickly and hitting the limiting plate during the retraction of the second return spring 33, which would cause the translation plate 32 to swing too much.

[0041] The material blocking assembly 37 includes an extension platform 38 fixedly mounted on the vertical plate 36. A fixed rod 39 is fixedly mounted on the top of the extension platform 38, and a telescopic rod 40 is placed on the top of the fixed rod 39. The fixed rod 39 is a hollow column, and a through hole matching the diameter of the telescopic rod 40 is provided on the top plate of the fixed rod 39. The telescopic rod 40 extends into the inner cavity of the fixed rod 39 through the through hole. A linkage block 41 is fixedly mounted on the top of the telescopic rod 40. A toggle block 13 is fixedly mounted on the outer wall of the sliding plate 11. The linkage block 41 is within the range of the toggle block 13 rotating with the guide cylinder 9, and the linkage block 41 and the toggle block 13 can move together. Both sides of the contact are inclined surfaces that can be fully contacted. When the rotating motor 7 drives the guide cylinder 9 to rotate counterclockwise, the inclined surfaces on the actuating block 13 and the linkage block 41 are in contact with each other and, during the continuous rotation of the actuating block 13, the linkage block 41 moves vertically upward through the telescopic rod 40. While the linkage block 41 is blocking the actuating block 13 from moving with the guide cylinder 9, the sliding plate 11, which is fixedly connected to the actuating block 13, moves in the sliding groove 10, opening the feed port 14 that is blocked by the baffle plate 44. After the contact between the actuating block 13 and the linkage block 41 is broken, the baffle plate 44 is pushed to move slowly by the connecting spring 12.

[0042] In use, the fabric bag liner produced is placed at the top of the feeding conveyor belt 3. The feeding conveyor belt 3 transfers the fabric bag liner to the position of the bonding and fixing plate 31 and pauses briefly. When the guide cylinder 9 is rotated counterclockwise by the rotary motor 7, the actuating block 13 on the guide cylinder 9 and the inclined surface on the linkage block 41 are in contact with each other. During the continuous rotation of the actuating block 13, the linkage block 41 moves vertically upward through the telescopic rod 40. While the linkage block 41 is blocking the actuating block 13 from moving with the guide cylinder 9, the sliding plate 11, which is fixedly connected to the actuating block 13, moves in the sliding groove 10, opening the feed port 14 that was blocked by the baffle plate 44. After the actuating block 13 breaks contact with the linkage block 41, it continues to move with the guide cylinder 9. At the same time, the actuating plate 16 rotates synchronously with the guide cylinder 9 during the rotation. Upon contact with the linkage plate 27, the first push plate 28 is driven to rotate synchronously via the rotating shaft 26. During the rotation of the first push plate 28, it contacts the translation rod 30. The translation rod 30 drives the translation plate 32 to move within the translation groove. During the movement, the translation plate 32 pushes the rotating plate 23 to rotate via the bonding rod, opening the gap between the rotating plate 23 and the fixed plate 31. As the second push plate 34 moves along with the translation plate 32, it can push the bag liner attached to the fixed plate 31 to move into the gap between the fixed plate 31 and the rotating plate 23, allowing the bag liner to move through the gap to the top of the unloading platform 42. When the guide cylinder 9 rotates one revolution and returns, the bag liner on the unloading platform 42 will fall into the guide cylinder 9 through the feed port 14 and fall onto the centralized conveyor belt 1 through the bottom opening of the guide cylinder 9.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transport assembly for producing fabric bag liners, comprising a centralized conveyor belt and an installation platform, characterized in that: The mounting platform is positioned directly above the centralized conveyor belt. Several feeding conveyor belts for conveying the inner linings of the fabric bags are installed on the mounting platform. A guide cylinder for guiding the inner linings of the fabric bags onto the centralized conveyor belt is movably placed at the center of the mounting platform. A placement platform is located directly above the mounting platform, and the placement platform is connected to the mounting platform via four first hydraulic push rods. A mounting frame is fixedly installed on the placement platform, and a rotary motor for driving the guide cylinder to rotate is installed on the mounting frame. A connecting frame is connected to the rotary motor and is fixedly installed on the inner wall of the guide cylinder. A guide for the fabric bags is provided on the outer wall of the guide cylinder. The bag liner enters through an inlet. The mounting platform is equipped with several guide plates and fixing frames to restrict the movement of the bag liner. The guide plates are connected to the mounting platform via uprights. A horizontal plate is provided on the outer wall of the guide cylinder, and a deflector plate is provided on the horizontal plate. A rotating shaft is rotatably mounted on the guide plate. A linkage plate and a first push plate are fixedly mounted on the rotating shaft to cooperate with the deflector plate. A protrusion is provided on the fixing frame, and a translation rod that moves with the first push plate is movably mounted on the protrusion. A translation plate is connected to the translation rod, and a second push plate for pushing the bag liner is fixedly mounted on the translation plate. The second push plate has a rotating plate rotatably mounted on the guide plate for fitting the fixing plate. A positioning block is mounted on the rotating plate to limit its movement. Several unloading platforms are provided on the mounting platform, each equipped with a roller to guide the movement of the bag lining. A vertical plate is mounted at the top of the fixing frame, and a material-blocking assembly is provided on the vertical plate. The material-blocking assembly includes an extension platform, a fixed rod on the extension platform, a telescopic rod on the fixed rod, and a linkage block on the telescopic rod. A sliding groove is provided on the outer wall of the guide cylinder, and a sliding plate is slidably mounted within the sliding groove. A baffle plate for blocking the feed inlet is provided on the sliding plate. A toggle block for cooperating with the linkage block is provided on the sliding plate. The sliding plate is connected to the inner wall of the sliding groove by a connecting spring. A translational sliding groove is provided on the fixed plate. A slider is slidably installed in the translational sliding groove and is fixedly installed at the bottom end of the translational plate. The slider is connected to the inner wall of the translational sliding groove by a second return spring. A ring is provided directly above the guide cylinder. Two lifting rods are provided at the bottom end of the ring. The bottom ends of the two lifting rods are connected to a pressure plate. The ring is connected to the connecting frame by two first return springs.

2. The transport assembly for producing cloth bag linings according to claim 1, characterized in that: A fixing plate for blocking the inner lining of the cloth bag is fixedly installed on the fixing frame.

3. A transport assembly for producing cloth bag linings according to claim 1, characterized in that: The second push plate is connected to a baffle for blocking the gap between the fixing frame and the second push plate.

4. A transport assembly for producing cloth bag linings according to claim 1, characterized in that: Several rollers are provided on the parts where the rotating plate and the second push plate are in contact with each other to reduce the friction between the two and the inner lining of the bag.

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