A paper bag pulling and tearing mechanism

Abstract

The utility model discloses a paper bag traction break mechanism, including frame, its characterized in that frame is installed with former traction subassembly and the rear traction subassembly of speed higher than former traction subassembly, and the front lower conveying subassembly of former traction subassembly is installed with the front lifting roller group that can reciprocating lift, and the front upper conveying subassembly of former traction subassembly is installed with the pinch roller group, and frame is installed with the rotating roller, and the rotating roller is installed with the first swing arm and connecting piece driven by cam group, and the both sides of connecting piece are installed with the first connecting rod and second connecting rod of opposite motion direction respectively, and the rear lower conveying subassembly of rear traction subassembly is installed with the rear lifting roller group connected with first connecting rod, and the rear upper conveying subassembly of rear traction subassembly is installed with the rear lower pressure roller group connected with second connecting rod, through the design of differential, complete bag strip break under the premise of not reducing the production line speed, in addition, through the switching cam type adjustment pinch loose frequency, match different production line speed, can effectively improve the paper bag output in unit time.

Description

Technical Field

[0001] This utility model relates to a production line for packaging bags such as cement bags and chemical bags, and in particular to a paper bag traction and tearing mechanism. Background Technology

[0002] In the large-scale production of packaging bags such as cement bags and chemical bags, raw materials are continuously conveyed in the form of long strips in rolls. After multiple processes such as folding, gluing, and pressing, a continuous bag strip structure is formed. This structure consists of multiple packaging bag blanks connected end to end. Weak connecting parts are reserved between adjacent bag blanks to facilitate separation. The tearing process is a key link in the production chain. It needs to be precisely applied to the weak connecting parts to disassemble the continuous bag strips into independent finished packaging bags. Its efficiency and stability directly determine the capacity and product quality of the entire production line.

[0003] Currently, the industry mostly uses intermittent traction or additional cutting devices to break continuous bag strips: intermittent traction creates a tension gap in the bag strip by periodically stopping or slowing down, but it limits the overall speed of the production line and seriously affects production efficiency; additional cutting devices can achieve continuous operation, but require precise control of the cutting timing and force, which is not only complex in structure and high in maintenance cost, but also prone to damage to packaging bags due to cutting errors, reducing the product qualification rate. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a paper bag traction and tearing mechanism.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A paper bag traction and tearing mechanism includes a frame, on which a front traction assembly and a rear traction assembly with a higher speed than the front traction assembly are mounted. The front traction assembly consists of a front lower conveyor assembly and a front upper conveyor assembly. The front lower conveyor assembly is located within a conveyor belt and is equipped with a reciprocating lifting front lifting roller assembly. The front upper conveyor assembly is equipped with a clamping roller assembly corresponding to the front lifting roller assembly. A rotating roller is mounted on the frame. The rotating roller is equipped with a first swing arm driven by a cam assembly and a connecting member that moves synchronously with the rotating roller. A first connecting rod and a second connecting rod with opposite directions of movement are respectively mounted on both sides of the connecting member. The rear traction assembly consists of a rear lower conveyor assembly and a rear upper conveyor assembly. The rear lower conveyor assembly is equipped with a rear lifting roller assembly connected to the first connecting rod, and the rear upper conveyor assembly is equipped with a rear lower pressure roller assembly connected to the second connecting rod.

[0007] The lower front conveyor assembly has symmetrical second swing arms mounted on both sides. The front lifting roller assembly is mounted on the second swing arms. The upper front conveyor assembly is equipped with a first cylinder that drives the second swing arms to swing up and down. The extension rod of the first cylinder is connected to the end of the second swing arm.

[0008] The front upper conveyor assembly is equipped with a first rotating handle that controls the position of the clamping roller group in the direction of the axis. The clamping roller group is provided with a plurality of first annular grooves along the axis to avoid the glue application position of the paper bag.

[0009] The rear lower conveyor assembly has symmetrical third swing arms installed on both sides, the rear lifting roller assembly is installed on the third swing arms, and the first connecting rod is connected to the end of the third swing arm. The rear upper conveyor assembly has symmetrical fourth swing arms installed on both sides, the rear lower pressure roller assembly is installed on the fourth swing arm, and the second connecting rod is connected to the end of the fourth swing arm.

[0010] The upper rear conveyor assembly is equipped with a second rotating handle that controls the position of the lower rear pressure roller group in the direction of the axis. The lower rear pressure roller group is provided with a plurality of second annular grooves along the axis to avoid the glue application position of the paper bag.

[0011] The first connecting rod is directly connected to one side of the connector via a pivot. An "L"-shaped part consisting of a horizontal part and a vertical part is rotatably mounted on the other side of the connector. The connector is connected to the corner of the "L"-shaped part via a pivot. The lower end of the vertical part is connected to the second connecting rod. A swingable second cylinder is mounted on the frame. The telescopic shaft of the second cylinder is connected to the end of the horizontal part.

[0012] A guide wheel is installed at the end of the first swing arm, and the guide wheel abuts against the cam assembly.

[0013] The cam assembly consists of a single cam and a double cam.

[0014] The frame is equipped with a feeding mechanism that has the same speed as the rear traction assembly. The feeding mechanism is symmetrically equipped with a base plate and a paper-guiding rod assembly that can move closer or further away from each other at the same time. The outer end of the base plate is folded upward to form a beveled surface.

[0015] The feeding mechanism is equipped with a rotating rod that can be turned by a hand crank. The rotating rod is provided with a positive thread and a negative thread. Each of the positive thread and the negative thread is equipped with a mounting bracket. The base plate and the paper-feeding rod assembly are mounted on the mounting bracket.

[0016] The beneficial effects of this utility model are as follows: This utility model has a front pulling assembly and a rear pulling assembly with a higher speed installed on the frame. The front pulling assembly consists of a front lower conveyor assembly and a front upper conveyor assembly. The front lower conveyor assembly is located inside the conveyor belt and has a front lifting roller group that can be reciprocated and raised. The front upper conveyor assembly has a clamping roller group installed corresponding to the front lifting roller group. The frame is equipped with a rotating roller. The rotating roller is equipped with a first swing arm driven by a cam group and a connecting piece that moves synchronously with the rotating roller. The two sides of the connecting piece are respectively equipped with a first connecting rod and a second connecting rod with opposite directions of movement. The rear pulling assembly consists of a rear lower conveyor assembly and a rear upper conveyor assembly. The rear lower conveyor assembly is equipped with a rear lifting roller group connected to the first connecting rod. The rear upper conveyor assembly is equipped with a rear lower pressure roller group connected to the second connecting rod. Through the differential speed design, the bag strip is torn off without reducing the production line speed. In addition, by switching the cam type to adjust the clamping frequency to match different production line speeds, the paper bag output per unit time can be effectively increased. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a structural diagram of the present invention;

[0019] Figure 2 This is a structural diagram of the front tensioning assembly;

[0020] Figure 3 This is a structural diagram of the front-to-upper transmission component;

[0021] Figure 4 This is a structural diagram of the front lifting roller group (rear lifting roller group);

[0022] Figure 5 This is a structural diagram of the clamping roller group (rear lower pressure roller group);

[0023] Figure 6 This is a structural diagram of the rear tensioning assembly;

[0024] Figure 7 This is one of the structural diagrams for the cam assembly;

[0025] Figure 8 This is the second structural diagram of the cam assembly;

[0026] Figure 9 This is a structural diagram of the upper transmission component;

[0027] Figure 10 This is a structural diagram of the transmission component. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0029] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0030] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0031] Reference Figure 1-10 A paper bag traction and tearing mechanism includes a frame 1, on which a front traction assembly 2 and a rear traction assembly 3 with a speed higher than that of the front traction assembly 2 are mounted. The front traction assembly 2 consists of a front lower conveyor assembly 4 and a front upper conveyor assembly 5. The front lower conveyor assembly 4 is located within a conveyor belt and is equipped with a reciprocating lifting front lifting roller group 6. The front upper conveyor assembly 5 is equipped with a clamping roller group 7 corresponding to the front lifting roller group 6. A rotating roller 10 is mounted on the frame 1, and a cam group 11 drives the rotating roller 10. The first swing arm 12 and the connecting member 13 that moves synchronously with the rotating roller 10 are provided. The cam group 11 is composed of a single cam and a double cam. The first connecting rod 14 and the second connecting rod 15 with opposite directions of movement are respectively installed on both sides of the connecting member 13. The rear pulling assembly 3 is composed of a rear lower conveying assembly 8 and a rear upper conveying assembly 9. The rear lower conveying assembly 8 is equipped with a rear lifting roller group 16 connected to the first connecting rod 14. The rear upper conveying assembly 9 is equipped with a rear lower pressure roller group 17 connected to the second connecting rod 15.

[0032] By employing a differential speed design where the front traction assembly 2 maintains a constant speed while the rear traction assembly 3 operates at a faster speed, the bag strip can be torn without reducing the overall speed of the production line. This completely solves the efficiency bottleneck caused by slowing down or stopping in traditional intermittent traction, significantly increasing the output of paper bags per unit time. Furthermore, the rear traction assembly 3 uses a cam group 11 formed by various types of cams, which can adjust the clamping frequency by switching cam types to precisely match different production line speeds. When the production line speeds up, using dual cams can achieve a higher frequency of clamping action; when the production line slows down, a single cam can meet the requirements without large-scale modifications to the mechanism, greatly improving the equipment's adaptability to diverse production scenarios.

[0033] The front lower conveying assembly 4 has symmetrical second swing arms 18 installed on both sides. The front lifting roller group 6 is installed on the second swing arms 18. The front upper conveying assembly 5 is equipped with a first cylinder 19 that drives the second swing arms 18 to swing up and down. The telescopic rod of the first cylinder 19 is connected to the end of the second swing arm 18.

[0034] Furthermore, one end of the second swing arm 18 is mounted on the lower front conveyor assembly 4 via a mounting shaft and bearing. The telescopic rod of the first cylinder 19 is connected to the other end of the second swing arm 18. The first cylinder 19 is rotatably mounted on the upper front conveyor assembly 5 via a mounting seat. When the first cylinder 19 is activated, the second swing arm 18 rotates around the mounting shaft. As the second swing arm 18 moves, the mounting seat rotates accordingly, creating a linkage effect. This avoids the formation of tangential force between the telescopic rod of the first cylinder 19 and the first cylinder 19, ensuring the smooth extension and retraction of the telescopic rod of the first cylinder 19.

[0035] By adjusting the extension and retraction stroke of the telescopic rod of the first cylinder 19, the clamping distance and clamping force of the front lifting roller group 6 and the clamping roller group 7 on the paper bag can be controlled to adapt to the conveying needs of bag strips of different thicknesses.

[0036] The front upper conveying assembly 5 is equipped with a first rotating handle 20 for controlling the position of the clamping roller group 7 in the direction of the axis. The clamping roller group 7 is provided with a plurality of first annular grooves 21 along the axis to avoid the glue application position of the paper bag. By adjusting the position of the clamping roller group 7, the first annular grooves 21 are aligned with the glue application position of the paper bag. When the front lifting roller group 6 and the clamping roller group 7 clamp the paper bag, the glue application position of the paper bag is not clamped, which can prevent the glue from being squeezed out before it dries, thereby affecting the appearance of the paper bag and the bonding quality.

[0037] Furthermore, the first annular groove 21 is provided in several parts to accommodate the production needs of paper bags of different sizes.

[0038] Furthermore, the clamping roller group 7 is mounted on the front upper conveying assembly 5 via a bracket. The end of the first rotating handle 20 is connected to the bracket via a thread. When the first rotating handle 20 is rotated, the bracket can be moved through the threaded structure, thereby achieving the purpose of adjusting the clamping roller group 7.

[0039] The rear lower conveying assembly 8 has symmetrical third swing arms 22 installed on both sides, the rear lifting roller group 16 is installed on the third swing arms 22, the first connecting rod 14 is connected to the end of the third swing arms 22, the rear upper conveying assembly 9 has symmetrical fourth swing arms 23 installed on both sides, the rear lower pressure roller group 17 is installed on the fourth swing arms 23, and the second connecting rod 15 is connected to the end of the fourth swing arms 23.

[0040] Furthermore, one end of the third swing arm 22 and the fourth swing arm 23 are also mounted on the rear lower conveying assembly 8 and the rear upper conveying assembly 9 respectively via mounting shafts and bearings. The first connecting rod 14 and the second connecting rod 15 are respectively connected to the other end of the third swing arm 22 and the fourth swing arm 23. The mounting shaft and bearing of the third swing arm 22 are located on the side of the rear lower conveying assembly 8 closer to the front traction assembly 2, and the mounting shaft and bearing of the fourth swing arm 23 are located on the side of the rear lower conveying assembly 8 away from the front traction assembly 2. That is, the rotation points of the third swing arm 22 and the fourth swing arm 23 are located on both sides of the rear traction assembly 3.

[0041] The upper rear conveyor assembly 9 is equipped with a second rotating handle 24 for adjusting the position of the lower rear pressure roller group 17 in the direction of the axis. The lower rear pressure roller group 17 is provided with a plurality of second annular grooves 25 along the axis to avoid the glue application position of the paper bag.

[0042] By adjusting the position of the rear lower pressure roller group 17, the second annular groove 25 is aligned with the glue application position of the paper bag. When the rear lifting roller group 16 and the rear lower pressure roller group 17 clamp the paper bag, the glue application position of the paper bag is not clamped, which can prevent the glue from being squeezed out before it dries, thereby affecting the appearance of the paper bag and the bonding quality.

[0043] Furthermore, the second annular groove 25 is provided in several parts to accommodate the production needs of paper bags of different sizes.

[0044] Similarly, the rear lower pressure roller group 17 is mounted on the rear upper conveying assembly 9 via a bracket. The end of the second rotating handle 24 is connected to the bracket via a thread. When the second rotating handle 24 is rotated, the bracket can be moved through the threaded structure, thereby achieving the purpose of adjusting the rear lower pressure roller group 17.

[0045] When one paper bag is in the front pulling assembly 2 and the other is in the rear pulling assembly 3, the first cylinder 19 is activated, pulling up the front lifting roller group 6, which cooperates with the clamping roller group 7 to clamp the paper bags on the conveyor belts of the front lower conveyor group 4 and the front upper conveyor group 5. At the same time, the cam part of the cam group 11 rotates to abut against the first swing arm 12. At this time, the first connecting rod 14 rises to its highest position, the second connecting rod 15 falls to its lowest position, the rear lifting roller group 16 rises, and the rear lower pressure roller group 17 presses down, causing the conveyor belts of the rear lower conveyor group 8 and the rear upper conveyor group 9 to clamp the paper bags. Due to the speed difference between the front pulling assembly 2 and the rear pulling assembly 3, the transport speed of the two paper bags differs, thus tearing the two paper bags apart.

[0046] After the paper bag is compressed and torn open once, the front pulling component 2 and the rear pulling component 3 will reopen, and the paper bag can be transported normally on the conveyor belt of the front pulling component 2 and the rear pulling component 3. When two consecutive paper bags are transported back to the front pulling component 2 and the rear pulling component 3, the paper bag will be compressed and torn open again, forming a cycle.

[0047] The first connecting rod 14 is directly connected to one side of the connecting member 13 via a pivot. An "L"-shaped member 26, consisting of a horizontal part and a vertical part, is rotatably mounted on the other side of the connecting member 13. The connecting member 13 is connected to the corner of the "L"-shaped member 26 via a pivot. The lower end of the vertical part is connected to the second connecting rod 15. A swingable second cylinder 27 is mounted on the frame 1. The telescopic shaft of the second cylinder 27 is connected to the end of the horizontal part.

[0048] Because the spaces between the front lower conveyor assembly 4 and the front upper conveyor assembly 5, and between the rear lower conveyor assembly 8 and the rear upper conveyor assembly 9, are relatively small, in the initial stage of production, and given the relatively long overall length of the front pulling assembly 2 and the rear pulling assembly 3, it is difficult for the paper bag strip to pass directly and completely through the entire front pulling assembly 2 and the rear pulling assembly 3. Therefore, when the front end of the paper bag strip is transported to the front pulling assembly 2 and the rear pulling assembly 3, the worker passes the front end of the paper bag strip through the front pulling assembly 2 (the paper bag strip has friction with the conveyor belt of the front pulling assembly 2, so only a small section of the paper bag strip needs to pass through the front pulling assembly 2; the worker can manually rotate the front pulling assembly 2 to make the paper bag strip pass through). If the same method is used, the paper bag strip is pulled by friction after passing through the rear pulling assembly 3. The front pulling assembly 2 also pulls the paper bag strip by friction, causing the paper bag strip to break. Therefore, the paper bag strip passes through the rear pulling assembly 3, and the second cylinder 27 is activated, causing the second cylinder 27 to push the transverse part to rotate upward. Subsequently, the transverse part drives the second connecting rod 15 to rise, thereby supporting the rear upper conveying assembly 9 through the rear lower pressure roller group 17 (at this time, the rear upper conveying assembly 9 and the rear lower conveying assembly 8 are in a trumpet shape). At this time, the front end of the paper bag strip can easily pass through the rear pulling assembly 3. Finally, the rear pulling assembly 3 is restored, and normal production can be carried out.

[0049] A guide wheel 28 is installed at the end of the first swing arm 12. The guide wheel 28 abuts against the cam group 11, which greatly reduces frictional resistance, reduces energy loss, reduces wear on parts, extends the service life of the cam group 11 and the first swing arm 12, and ensures the long-term stability of transmission accuracy.

[0050] Furthermore, a synchronously rotating buffer arm 36 is installed at the end of the rotating roller 10. A limit screw 39 is installed on the buffer arm 36. The first swing arm 12 is connected to the rotating roller 10 through a bearing. A top block 37 is installed on the first swing arm 12. An adjusting bolt 38 is threaded on the top block 37. The adjusting bolt 38 is provided with an internal threaded hole corresponding to the limit screw 39. The end of the limit screw 39 is installed in the internal threaded hole. A spring sheet assembly 40 is installed on the limit screw 39 between the buffer arm 36 and the top block 37.

[0051] Furthermore, the buffer arm 36 is provided with a through hole, through which the limiting screw 39 passes. A limiting nut 41 is provided on the side of the buffer arm 36 away from the top block 37. When it is necessary to adjust the closing distance between the rear lifting roller group 16 and the rear lower pressure roller group 17, the distance between the adjusting bolt 38 and the limiting nut 41 remains unchanged by turning the adjusting bolt 38, while the distance between the top block 37 and the buffer arm 36 changes. Since the movement relationship between the cam group 11 and the first swing arm 12 remains unchanged, the closer the buffer arm 36 is to the top block 37, the greater the closing distance between the rear lifting roller group 16 and the rear lower pressure roller group 17.

[0052] When the adjusting bolt 38 is screwed to its limit (unable to be screwed any further while ensuring installation strength), the adjusting bolt 38 can be compensated by screwing the position of the limiting nut 41, thereby further increasing the adjustment space of the closing distance between the rear lifting roller group 16 and the rear lower pressing roller group 17, and adapting to paper bags of different thicknesses.

[0053] After installation, the elastic force generated by the spring assembly 40 will cause the buffer arm 36 and the top block 37 to tend to move away from each other. However, due to the engagement of the first swing arm 12 and the cam assembly 11, the top block 37 cannot move. As for the buffer arm 36, since the buffer arm 36 and the rotating roller 10 are fixedly connected and rotate synchronously, when the buffer arm 36 rotates, the rotating roller 10 will drive the rear lifting roller assembly 16 and the rear lower pressing roller assembly 17 to close through the first connecting rod 14 and the second connecting rod 15. However, when the first swing arm 12 does not swing, the elastic force generated by the spring assembly 40 alone is insufficient to drive the rear lifting roller assembly 16 and the rear lower pressing roller assembly to change, so the buffer arm 36 will not move.

[0054] When the cam assembly 11 drives the first swing arm 12 to swing, the spring assembly 40 is further compressed, generating greater elastic force, causing the rear lifting roller assembly 16 and the rear lower pressing roller assembly 17 to close. However, after the rear lifting roller assembly 16 and the rear lower pressing roller assembly 17 have closed, if the first swing arm 12 has not yet swung to its limit when the rear lifting roller assembly 16 and the rear lower pressing roller assembly 17 undergo a rigid collision, the cam assembly 11 will further drive the first swing arm 12 to swing. At this time, since the rear lifting roller assembly 16 and the rear lower pressing roller assembly 17 are already in a state of rigid contact, no further change can occur. The spring assembly 40 will be further compressed to compensate for the swing amplitude and act as a buffer to prevent equipment damage. During production, the closure of the rear lifting roller assembly 16 and the rear lower pressure roller assembly 17 is adjusted according to different paper bag thicknesses. Under normal production conditions, the paper bag will not be crushed. However, if the rear lifting roller assembly 16 and the rear lower pressure roller assembly 17 make rigid contact, the paper bag will be crushed. The closure distance between the rear lifting roller assembly 16 and the rear lower pressure roller assembly 17 can be visually observed from the shape of the paper bag to see if it is reasonable (if the tearing effect is poor, it means that the closure distance is too large, resulting in the inability to tear normally).

[0055] The frame 1 is equipped with a feeding mechanism 29 that operates at the same speed as the rear pulling assembly 3 (the conveying principle of the feeding mechanism 29, such as the structure of the conveyor belt and the driving device, is existing technology and will not be described in detail). The feeding mechanism 29 is symmetrically equipped with a base plate 30 and a paper-guiding rod assembly 31 that can move closer or further away from each other at the same time. The outer end of the base plate 30 is folded upward to form a sloping surface 32. When the paper bag passes through the base plate 30, both sides of the paper bag will rise along the sloping surface 32. At the same time, since the paper-guiding rod assembly 31 will apply a force to the paper bag against the base plate 30, both sides of the paper bag will bend upward along the sloping surface 32, which avoids jamming in subsequent stacking processes and improves the efficiency of connecting with subsequent processes.

[0056] The feeding mechanism 29 is equipped with a rotating rod 34 that can be rotated by a hand crank 33. The rotating rod 34 is provided with a positive thread and a negative thread. Each of the positive thread and the negative thread is equipped with a mounting bracket 35. The base plate 30 and the paper-feeding rod assembly 31 are mounted on the mounting bracket 35. The rotating rod 34 is driven by the hand crank 33, and the mounting bracket 35 is synchronously and symmetrically adjusted by using the positive and negative threads. The operation is simple and the adjustment accuracy is high. It can quickly adapt to the conveying needs of packaging bags of different specifications and improve the equipment adjustment efficiency.

[0057] Furthermore, the feeding mechanism 29 comprises an upper conveying assembly 42 and a lower conveying assembly 43. The upper conveying assembly 42 consists of conventional transmission wheels and transmission belts. The lower conveying assembly 43 is mounted on the frame 1. The rotating rod 34, mounting bracket 35, base plate 30, and paper-feeding rod assembly 31 are mounted on the lower conveying assembly 43. A support member 44 is mounted on the frame 1. A boom 46 driven by a third cylinder 45 is mounted on the support member 44. A rotatable lifting frame 47 is mounted at the center of the boom 46. The upper conveying assembly 42 is mounted on the lower end of the lifting frame 47. The upper end of the lifting frame 47 is connected to the support member 44 via a linkage rod 48.

[0058] When a paper bag gets stuck in the feeding mechanism 29, the third cylinder 45 is activated to lift the boom 46, thereby raising the entire upper conveying assembly 42. At the same time, the lifting frame 47 and the linkage rod 48 are linked synchronously to keep the upper conveying assembly 42 in a horizontal state. After the stuck paper bag is cleared, the upper conveying assembly 42 can be reset by the third cylinder 45.

[0059] In this invention, the term "multiple" refers to two or more items unless otherwise expressly defined. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] It should be noted that when a component is referred to as being "assembled on," "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0061] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A paper bag traction and tearing mechanism, comprising a frame (1), characterized in that... The frame (1) is equipped with a front traction assembly (2) and a rear traction assembly (3) with a speed higher than that of the front traction assembly (2). The front traction assembly (2) consists of a front lower conveyor assembly (4) and a front upper conveyor assembly (5). The front lower conveyor assembly (4) is located inside the conveyor belt and is equipped with a reciprocating lifting front lifting roller group (6). The front upper conveyor assembly (5) is equipped with a clamping roller group (7) corresponding to the front lifting roller group (6). The frame (1) is equipped with a rotating roller (10), and the rotating roller (10) is equipped with a cam group (11) that drives it. The first swing arm (12) moves synchronously with the rotating roller (10). The first connecting rod (14) and the second connecting rod (15) with opposite directions of movement are respectively installed on both sides of the connecting rod (13). The rear pulling assembly (3) is composed of a rear lower conveying assembly (8) and a rear upper conveying assembly (9). The rear lower conveying assembly (8) is equipped with a rear lifting roller group (16) connected to the first connecting rod (14). The rear upper conveying assembly (9) is equipped with a rear lower pressure roller group (17) connected to the second connecting rod (15).

2. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The front lower conveying assembly (4) is equipped with symmetrical second swing arms (18) on both sides. The front lifting roller group (6) is installed on the second swing arms (18). The front upper conveying assembly (5) is equipped with a first cylinder (19) that drives the second swing arms (18) to swing up and down. The telescopic rod of the first cylinder (19) is connected to the end of the second swing arms (18).

3. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The front upper conveyor assembly (5) is equipped with a first rotating handle (20) for adjusting the position of the clamping roller group (7) in the direction of the axis. The clamping roller group (7) is provided with a plurality of first annular grooves (21) along the axis to avoid the glue application position of the paper bag.

4. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The rear lower conveyor assembly (8) is equipped with symmetrical third swing arms (22) on both sides, the rear lifting roller assembly (16) is mounted on the third swing arm (22), the first connecting rod (14) is connected to the end of the third swing arm (22), the rear upper conveyor assembly (9) is equipped with symmetrical fourth swing arms (23) on both sides, the rear lower pressure roller assembly (17) is mounted on the fourth swing arm (23), and the second connecting rod (15) is connected to the end of the fourth swing arm (23).

5. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The upper rear conveyor assembly (9) is equipped with a second rotating handle (24) for adjusting the position of the lower rear pressure roller assembly (17) in the direction of the axis. The lower rear pressure roller assembly (17) is provided with a plurality of second annular grooves (25) along the axis to avoid the glue application position of the paper bag.

6. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The first connecting rod (14) is directly connected to one side of the connecting member (13) via a rotating shaft. An "L"-shaped part (26) composed of a horizontal part and a vertical part is rotatably installed on the other side of the connecting member (13). The connecting member (13) is connected to the corner of the "L"-shaped part (26) via a rotating shaft. The lower end of the vertical part is connected to the second connecting rod (15). A swingable second cylinder (27) is installed on the frame (1). The telescopic shaft of the second cylinder (27) is connected to the end of the horizontal part.

7. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The end of the first swing arm (12) is equipped with a guide wheel (28), which abuts against the cam assembly (11).

8. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The cam assembly (11) consists of a single cam and a double cam.

9. The paper bag traction and tearing mechanism according to claim 1, characterized in that... The frame (1) is equipped with a feeding mechanism (29) with the same speed as the rear pulling assembly (3). The feeding mechanism (29) is symmetrically equipped with a base plate (30) and a paper-pressing rod assembly (31) that can move closer or further away from each other at the same time. The outer end of the base plate (30) is folded upward to form a beveled surface (32).

10. The paper bag traction and tearing mechanism according to claim 9, characterized in that... The feeding mechanism (29) is equipped with a rotating rod (34) that can be rotated by a hand crank (33). The rotating rod (34) is provided with a positive thread and a negative thread. Both the positive thread and the negative thread are equipped with mounting brackets (35). The base plate (30) and the paper-pressing rod assembly (31) are mounted on the mounting brackets (35).

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