A square bottom paper bag making machine

Abstract

The application relates to a square-bottom paper bag making machine, and belongs to the technical field of the paper bag making machine. Two limiting plates are arranged on the transmission rack in a symmetrical mode, the spacing between the two limiting plates is equal to the width of the paper bag, the running direction of the paper bag is limited from deviation, a positioning plate is arranged, when the positioning plate extends to the surface of the transmission rack, the positioning plate blocks the transmission of the paper bag, when the positioning plate is retracted to the bottom of the transmission rack, the positioning plate no longer blocks the transmission of the paper bag, the glue applying position of the glue applying assembly to the paper bag is consistent when each paper bag is transmitted to the position of the glue applying assembly, and the glue applying effect of the paper bag is ensured.

Description

Technical Field

[0001] This invention belongs to the field of bag making machine technology, specifically relating to a square bottom paper bag making machine. Background Technology

[0002] A paper bag making machine is a device that processes paper into paper bags. A single-sheet paper bag making machine is a type of bag making machine. In the process of making a square paper bag from a single sheet of paper, glue needs to be applied to the paper to bond the whole sheet of paper into a cylindrical structure.

[0003] For example, the invention patent with patent application publication number CN115923242A includes a machine body, a glue-applying box and a glue-applying belt fixedly mounted on the machine body for applying glue to paper. Inside the machine body, a support roller for supporting paper movement and a drive disc for driving paper movement are rotatably mounted. A glue-applying disc is rotatably mounted above the glue-applying box and driven by a drive device inside the machine body. The glue-applying disc has a limiting groove for fixing the glue-applying belt, a notch, and a mounting groove. A detachable block is installed at the notch, and a rotating ring for fixing the detachable block is installed inside the mounting groove. The detachable block is connected to the rotating ring via a sliding block. A guide assembly for guiding the movement of the glue-applying belt is provided on one side of the glue-applying box. With the above structure, this invention can conveniently and intermittently apply glue to single sheets of paper as they pass sequentially below the glue-applying equipment, avoiding glue residue on the surface of the support roller.

[0004] Based on the search of the aforementioned patent application publication numbers, and considering their shortcomings, the following was found: Existing square-bottom paper bag making machines are equipped with gluing components to apply glue to passing paper bags. However, because the initial position of the paper bag is not positioned during the gluing process, the actual movement position of the paper bag on the conveyor frame deviates from its theoretical position. Consequently, the actual gluing position of the paper bag also deviates from the theoretical gluing position, affecting the subsequent bonding effect of the paper bag. Summary of the Invention

[0005] To address the problem that existing square-bottom paper bag making machines lack positioning components when transporting multiple individual paper bags, causing the bags to shift during transport and consequently affecting the glue application position, thus impacting the bonding effect of subsequent paper bags, this solution provides a square-bottom paper bag making machine.

[0006] The objective of this invention can be achieved through the following technical solutions: A square-bottom paper bag making machine includes a conveyor frame. Along the running direction of the conveyor frame, it further includes two ranging modules, a positioning component, and a gluing component. The gluing component is disposed on the conveyor frame and is used to apply glue to the paper bags passing through it. The positioning component includes a positioning plate and two limiting plates. The positioning plate is vertically and flexibly disposed on the conveying end surface of the conveyor frame. The two limiting plates are symmetrically disposed at both ends of the surface of the conveyor frame, and the distance between the two limiting plates is equal to the width of the paper bag. The two ranging modules are symmetrically disposed at both ends of the bottom of the conveyor frame, and the distance between the two ranging modules is equal to the width of the paper bag. Both ranging modules are attached to the side wall of the positioning plate.

[0007] As a preferred embodiment of the present invention, the positioning component further includes a positioning cylinder and a positioning block. The positioning cylinder is vertically disposed at the bottom of the transmission frame and controls the positioning plate to move up and down. The positioning block is disposed at the bottom of the transmission frame and is located directly below the positioning plate. The distance between the positioning block and the bottom surface of the positioning plate is equal to the height of the top surface of the positioning plate extending beyond the surface of the transmission frame.

[0008] As a preferred embodiment of the present invention, the glue application assembly includes a glue tank containing glue, an air pump, a syringe, and a valve unit. The syringe is vertically mounted on the top of the conveyor frame. The glue tank is connected to the syringe via the air pump for replenishing glue to the syringe. The output port of the syringe is located at the top of one end of the paper bag. The valve unit is coaxially disposed at the output port of the syringe for controlling the opening and closing state of the output port of the syringe.

[0009] As a preferred embodiment of the present invention, the adhesive application assembly includes a fixed tube and a sliding tube connected coaxially. One end of the fixed tube is coaxially connected to the output port of the syringe, and the sliding tube is slidably disposed at the other end of the fixed tube. The valve unit includes a plurality of valve parts, which are disposed at equal angles around the central axis of the fixed tube inside the fixed tube. The adhesive application assembly also includes a valve plate, the cross-sectional shape of which is consistent with the cross-sectional shape inside the fixed tube. The valve plate is coaxially disposed inside the fixed tube, and the valve plate has a plurality of valve grooves, which are opened at equal angles along the central axis of the valve plate. A number of valve slots are matched one-to-one with a number of valve parts. Each valve part is set in the corresponding valve slot. The valve part includes a valve block, a return spring and a connecting rod. The valve block is hinged in the corresponding valve slot. The valve block can lock or release its sealing relationship with the valve slot. The two ends of the return spring are respectively connected to the valve block and the fixed tube. The two ends of the connecting rod are respectively hinged to the valve block and the sliding tube.

[0010] As a preferred embodiment of the present invention, the adhesive application assembly further includes a plurality of limiting blocks, which correspond one-to-one with a plurality of valve slots. One end of any of the limiting blocks is disposed on the top of the valve plate, and the other end extends to the top of the corresponding valve slot. The valve block can lock or release its contact relationship with the corresponding limiting block.

[0011] As a preferred embodiment of the present invention, the positioning assembly further includes a pressing block, a connecting block, a positioning spring, and an adhesive applicator. A pressing groove is formed at the bottom of the positioning plate, and the pressing block is slidably disposed within the pressing groove. A connecting slot is also formed on the side wall of the positioning plate, and the connecting slot communicates with the pressing groove. One end of the connecting block is connected to the side wall of the pressing block, and its other end extends out of the positioning plate through the connecting slot. The output end of the positioning cylinder is connected to the other end of the connecting block. The positioning spring is disposed within the connecting slot, and its two ends are respectively connected to the connecting block and the positioning plate. The adhesive applicator is located directly below the pressing block. The adhesive applicator also includes an adhesive applicator cylinder, which is vertically disposed at the bottom of the syringe and connected to the sliding tube. The adhesive applicator module is communicatively connected to the adhesive applicator cylinder. The distance between the adhesive applicator module and the pressing block is greater than the distance between the positioning block and the bottom surface of the positioning plate.

[0012] As a preferred embodiment of the present invention, when the pressing block presses the adhesive coating module, the front end face of the paper bag and the central axis of the sliding tube are on the same vertical plane. When the included angle between the valve block and the valve plate reaches its maximum, the vertical distance between the sliding tube and the paper bag is equal to the thickness of the adhesive adhering to the paper bag.

[0013] As a preferred embodiment of the present invention, the positioning component further includes a time module, which is communicatively connected to the positioning cylinder and the glue application module. The time module controls the positioning cylinder to press the glue application module and then reset after a certain period of time. When the positioning plate is reset and raised, the side wall surface of the positioning plate that is in contact with the ranging module and the rear end surface of the paper bag are located on the same vertical plane.

[0014] As a preferred embodiment of the present invention, the adhesive coating assembly further includes a flat bottom plate with a slot in the center. The flat bottom plate is coaxially disposed at the bottom of the sliding tube, and the bottom surface of the flat bottom plate is flush with the bottom surface of the sliding tube. The bottom surface of the flat bottom plate is parallel to the surface of the paper bag.

[0015] As a preferred embodiment of the present invention, the glue-applying assembly further includes a horizontal rod and a counterweight. One end of the horizontal rod is connected to the output end of the glue-applying cylinder. The axial direction of the horizontal rod is perpendicular to the running direction of the conveyor frame. The counterweight is connected to the other end of the horizontal rod. The bottom surface of the counterweight is flush with the bottom surface of the flat bottom plate. The side wall of the counterweight near the positioning plate and the side wall of the flat bottom plate near the positioning plate are on the same vertical plane. The width of the counterweight is the same as the width of the flat bottom plate and is along the central axis of the paper bag. The counterweight and the flat bottom plate are symmetrically arranged at both ends of the paper bag.

[0016] The beneficial effects of this invention are as follows: This solution uses two limiting plates symmetrically positioned on the conveyor frame, with the distance between them equal to the width of the paper bag. These plates restrict the paper bag's movement to prevent deviation. Simultaneously, a positioning plate is included. When the positioning plate extends beyond the conveyor frame surface, it obstructs the paper bag's transport; when it retracts to the bottom of the conveyor frame, it no longer obstructs transport. This ensures that when each paper bag reaches the gluing assembly, the gluing position is consistent, guaranteeing effective gluing. This solution addresses the problem in existing square-bottom paper bag making machines, which, despite having a gluing assembly, fail to properly position the paper bag initially during gluing. This leads to a discrepancy between the actual and theoretical gluing positions on the conveyor frame, affecting the subsequent bonding effect. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is an overall view of a square-bottom paper bag making machine according to the present invention; Figure 2 This is a front view of a square-bottom paper bag making machine according to the present invention; Figure 3 This is an overall view of the positioning component of a square-bottom paper bag making machine according to the present invention; Figure 4 This is a front view of the positioning component of a square-bottom paper bag making machine according to the present invention; Figure 5 This is a rear view of the positioning component of a square-bottom paper bag making machine according to the present invention; Figure 6 This is a cross-sectional view of the positioning plate of a square-bottom paper bag making machine according to the present invention; Figure 7 This is an overall view of the gluing assembly of a square-bottom paper bag making machine according to the present invention; Figure 8 This is a front view of the glue coating assembly of a square-bottom paper bag making machine according to the present invention; Figure 9 This is a cross-sectional view of the fixed tube and sliding tube of a square bottom paper bag making machine according to the present invention.

[0019] Explanation of main symbols In the diagram: 1. Transmission frame; 2. Distance measuring module; 3. Positioning component; 301. Positioning plate; 302. Limiting plate; 303. Positioning cylinder; 304. Positioning block; 305. Pressing block; 306. Connecting block; 307. Positioning spring; 308. Glue application module; 4. Glue application component; 401. Glue tank; 402. Air pump; 403. Injector; 404. Fixing tube; 405. Sliding tube; 406. Valve plate; 407. Limiting block; 408. Glue application cylinder; 409. Flat bottom plate; 410. Horizontal bar; 411. Balance block; 5. Valve unit; 501. Valve block; 502. Connecting rod; 6. Time module. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving the intended purpose, the following detailed description of the specific implementation methods, structures, features and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0021] Please see Figure 1-9This embodiment provides a square-bottom paper bag making machine, including a conveyor frame 1. Along the running direction of the conveyor frame 1, it also includes two ranging modules 2, a positioning component 3, and a gluing component 4. The gluing component 4 is disposed on the conveyor frame 1 and is used to apply glue to the paper bags passing through the gluing component 4. The positioning component 3 includes a positioning plate 301 and two limiting plates 302. The positioning plate 301 is flexibly disposed on the conveying end surface of the conveyor frame 1. The two limiting plates 302 are symmetrically disposed at both ends of the surface of the conveyor frame 1, and the distance between the two limiting plates 302 is equal to the width of the paper bag. The two ranging modules 2 are symmetrically disposed at both ends of the bottom of the conveyor frame 1, and the distance between the two ranging modules 2 is equal to the width of the paper bag. Both ranging modules 2 are attached to the side wall of the positioning plate 301. By providing two limiting plates 302, which are symmetrically disposed on the conveyor frame 1 and the distance between the two limiting plates 302 is equal to the width of the paper bag, the machine can effectively address the issue of paper bag defects. The width of the bag is used to limit the direction of the paper bag's movement to prevent deviation. Simultaneously, a positioning plate 301 is provided. When the positioning plate 301 extends beyond the surface of the conveyor frame 1, it blocks the transmission of the paper bag; when the positioning plate 301 retracts to the bottom of the conveyor frame 1, it no longer blocks the transmission of the paper bag. This ensures that when each paper bag is transmitted to the gluing component 4, the gluing position of the gluing component 4 is consistent, guaranteeing the gluing effect of the paper bag. This solves the problem in existing square-bottom paper bag making machines, which, despite having a gluing component 4, can apply glue to passing paper bags. However, in existing machines, the initial position of the paper bag is not positioned during the gluing process, causing a deviation between the actual and theoretical movement position of the paper bag on the conveyor frame 1. This leads to a discrepancy between the actual and theoretical gluing position, affecting the subsequent bonding effect of the paper bag. It should be noted that this solution is applied in a scenario where several paper bags are placed along the running direction of the conveyor frame 1, with varying spacing between them but without overlap. This device is used to apply adhesive to the paper bags. The ranging module 2 serves two purposes: First, in situations where the spacing between adjacent paper bags is not uniform, the detection module needs to detect when one end of the paper bag is in contact with the positioning plate 301 before controlling the positioning plate 301 to retract, causing it to retract to the bottom of the conveyor frame 1, ensuring the paper bag can pass smoothly. Second, in this solution, the length and width of the paper bags are different. Normally, the distance between the two limiting plates 302 is equal to the width of the paper bag, limiting its width to sliding within the two limiting plates 302. However, since the paper bag is a flexible material, its length can deform, restricting its length within the two limiting plates 302. This can lead to errors in subsequent adhesive application and bonding. Therefore, the ranging module 2 prevents this from happening.

[0022] It is worth noting that the working principle of the distance measuring module 2 in this solution is as follows: when a normal paper bag is attached to the positioning plate 301, the distance measured by the distance measuring module 2 is pre-set and recorded as T; then the distance measuring module 2 is set to measure the distance at regular intervals. When the value detected by the distance measuring module 2 is recorded as T1, T is compared with T1. If the values ​​of T1 and T are different, it means that although the paper bag is attached to the positioning plate 301, the length of the paper bag is restricted by deformation, which limits the sliding of the paper bag within the two limiting plates 302; if the distance measuring module 2 does not detect a value, it means that the paper bag has not yet abutted against the positioning plate 301.

[0023] It should be noted that this solution uses two ranging modules 2, with the distance between them equal to the width of the paper bag. Both ranging modules 2 are attached to the side wall of the positioning plate 301 because, in addition to deformation due to the length of the paper bag being limited by the sliding within the two limiting plates 302, the paper bag can also deform at its tilted end, sliding within the limiting plates 302 and coming into contact with the positioning plate 301. In this case, one ranging module 2 might detect a value that matches the preset value. Therefore, this solution uses two ranging modules 2 to prevent this from happening, ensuring that the paper bag slides within the two limiting plates 302 only when its width is limited.

[0024] Furthermore, the positioning component 3 of this solution also includes a positioning cylinder 303 and a positioning block 304. The positioning cylinder 303 is vertically set at the bottom of the transmission frame 1. The positioning cylinder 303 controls the positioning plate 301 to move up and down. The positioning block 304 is set at the bottom of the transmission frame 1 and is located directly below the positioning plate 301. The distance between the positioning block 304 and the bottom surface of the positioning plate 301 is equal to the height of the top surface of the positioning plate 301 extending out of the surface of the transmission frame 1. The positioning block 304 of this solution is used to limit the lowest position of the positioning plate 301. When the positioning plate 301 and the positioning block 304 are engaged, the top height of the positioning plate 301 is flush with the surface height of the transmission frame 1, so that the positioning plate 301 releases its engagement with the paper bag, and the paper bag can be moved to the position of the gluing component 4 by the transmission of the transmission frame 1.

[0025] Furthermore, the glue application assembly 4 of this solution includes a glue tank 401 containing glue, an air pump 402, a syringe 403, and a valve unit 5. The syringe 403 is vertically mounted on the top of the conveyor frame 1. The glue tank 401 is connected to the syringe 403 via the air pump 402 to replenish the syringe 403 with glue. The output port of the syringe 403 is located at the top of one end of the paper bag. The valve unit 5 is coaxially disposed at the output port of the syringe 403 to control the opening and closing state of the output port of the syringe 403. When the valve unit 5 releases its sealing relationship with the output port of the syringe 403, the glue in the syringe 403 flows out from its output port; when the valve unit 5 locks its sealing relationship with the output port of the syringe 403, the glue in the syringe 403 no longer flows out from its output port.

[0026] Furthermore, in order to describe the valve unit 5 in more detail, the adhesive application assembly 4 of this solution includes a fixed tube 404 and a sliding tube 405 coaxially connected. One end of the fixed tube 404 is coaxially connected to the output port of the syringe 403, and the sliding tube 405 is slidably disposed at the other end of the fixed tube 404. The valve unit 5 includes a plurality of valve parts, which are disposed at equal angles around the central axis of the fixed tube 404 inside the fixed tube 404. The adhesive application assembly 4 also includes a valve plate 406. The cross-sectional shape of the valve plate 406 is consistent with the cross-sectional shape inside the fixed tube 404. The valve plate 406 is coaxially and sealed inside the fixed tube 404. The valve plate 406 has several valve grooves. The valve grooves are opened at equal angles along the central axis of the valve plate 406. A number of valve slots correspond one-to-one with a number of valve sections. Each valve section is set in the corresponding valve slot. The valve section includes a valve block 501 and a connecting rod 502. The valve block 501 is rotatably set in the corresponding valve slot. The valve block 501 can lock or release its sealing relationship with the valve slot. The two ends of the connecting rod 502 are respectively hinged to the valve block 501 and the inner wall of the sliding tube 405. With this arrangement, when the sliding tube 405 slides along the axial direction of the fixed tube 404, the valve blocks 501 jointly release their sealing relationship with the valve plate 406. When the sliding tube 405 is reset, the valve blocks 501 jointly lock their sealing relationship with the valve plate 406, so as to realize the valve unit 5 controlling the opening and closing state of the output end of the syringe 403.

[0027] Furthermore, to ensure the sealing fit between valve block 501 and valve plate 406, the adhesive application assembly 4 in this solution also includes several limiting blocks 407. Each limiting block 407 corresponds to a valve groove. One end of any limiting block 407 is located on the top of valve plate 406, and the other end extends to the top of the corresponding valve groove. Valve block 501 can lock or release its contact with the corresponding limiting block 407. With this arrangement, when sliding tube 405 slides away from the paper bag, the opening angle between valve block 501 and valve plate 406 can be controlled to decrease until valve block 501 and valve plate 406 achieve a sealing fit. At this time, valve block 501 also contacts the corresponding limiting block 407, which can prevent sliding tube 405 from sliding away from the paper bag, thus ensuring the sealing fit between valve block 501 and valve plate 406.

[0028] Furthermore, this solution also needs to describe the cooperation relationship between the positioning plate 301 and the valve unit 5 after the positioning plate 301 is retracted. The positioning assembly 3 also includes a pressing block 305, a connecting block 306, a positioning spring 307, and an adhesive application module 308. The bottom end of the positioning plate 301 is provided with a pressing groove, and the pressing block 305 is slidably disposed in the pressing groove. The sliding direction of the pressing block 305 is consistent with the lifting direction of the positioning plate 301. The side wall of the positioning plate 301 is also provided with a connecting slot, which is interconnected with the pressing groove. The setting direction of the connecting slot is also consistent with the lifting direction of the positioning plate 301. One end of the connecting block 306 is connected to the side wall of the pressing block 305, and the other end passes through the connecting slot. Extending out of the positioning plate 301, the output end of the positioning cylinder 303 is connected to the other end of the connecting block 306. The positioning spring 307 is set in the connecting slot. The two ends of the positioning spring 307 are respectively connected to the connecting block 306 and the positioning plate 301. The glue application module 308 is located directly below the pressing block 305. The glue application assembly 4 also includes a glue application cylinder 408, which is vertically set at the bottom of the syringe 403. The output end of the glue application cylinder 408 is connected to the sliding tube 405. The glue application module 308 and the glue application cylinder 408 are in communication connection. The distance between the glue application module 308 and the pressing block 305 is greater than the distance between the positioning block 304 and the bottom surface of the positioning plate 301. The working process of the positioning component 3 in this solution is as follows: When the ranging module 2 detects that the paper bag is attached to the positioning plate 301, the ranging module 2 transmits a signal to the positioning cylinder 303. The positioning cylinder 303 controls the positioning plate 301 to move towards the bottom of the transmission frame 1 until the positioning plate 301 abuts against the positioning block 304. At this time, the top surface of the positioning plate 301 is flush with the transmission end surface of the transmission frame 1. The positioning plate 301 releases its attachment to the paper bag, and the paper bag moves towards the position of the gluing component 4 due to the transmission action of the transmission frame 1. During the movement of the paper bag, the positioning cylinder 303 continues to move towards the gluing module 308. At this time, the positioning cylinder 303 moves through the connecting block 30 6. Pressing the positioning spring 307 forces the length of the positioning spring 307 to shorten, thereby continuing to drive the pressing block 305 to move towards the glue application module 308 until the pressing block 305 presses the glue application module 308. It should be noted that the glue application module 308 in this solution is communicatively connected to the glue application cylinder 408. When the glue application module 308 is in the locked pressing state, the glue application module 308 will drive the telescopic end of the glue application cylinder 408 to extend, controlling the glue to flow out from the opening of the sliding tube 405. When the glue application module 308 is released from the pressing state, the glue application module 308 will drive the telescopic end of the glue application cylinder 408 to reset, so that the glue no longer flows out from the opening of the sliding tube 405.

[0029] It is worth noting that when the pressing block 305 presses the glue application module 308 in this solution, the front end face of the paper bag and the central axis of the sliding tube 405 are on the same vertical plane. This setting ensures that when the paper bag moves directly below the sliding tube 405, the glue in the syringe 403 will flow out from the opening and closing point between the valve plate 406 and the valve block 501. Since the sliding tube 405 slides on the fixed tube 404, its lowering height changes the opening and closing degree between the valve block 501 and the valve plate 406. When the angle between the valve block 501 and the valve plate 406 reaches its maximum, the vertical distance between the sliding tube 405 and the paper bag is equal to the thickness of the glue adhered to the paper bag. This setting ensures that the sliding tube 405 will not press the paper bag, preventing deformation of the paper bag's shape. Simultaneously, the distance between the sliding tube 405 and the paper bag will not be too high, preventing the glue adhered to the paper bag from flowing due to falling inertia. The glue used in this solution has fluidity.

[0030] Furthermore, since the distance between two adjacent paper bags in this solution is uncertain, and due to the special nature of the distance measuring module 2, the positioning plate 301 in this solution cannot touch the adjacent paper bag that has just passed through the positioning plate 301 when it is being lifted. Premature positioning of the positioning plate 301 will cause it to lift the paper bag that is currently passing through it. The more the positioning plate 301 lifts the paper bag, the greater the probability of deformation. Based on this, this solution also includes a time module 6, because the transmission speed of the transmission frame 1... The degree of motion is consistent, so the moving speed of the paper bag is also constant. The time module 6 is communicatively connected to the positioning cylinder 303 and the gluing module 308, respectively. After the positioning cylinder 303 presses the gluing module 308, it resets after a certain period of time. When the positioning plate 301 is reset and raised, the side wall surface of the positioning plate 301 that is in contact with the ranging module 2 is on the same vertical plane as the rear end surface of the paper bag. This setting not only ensures that the portion of the paper bag raised by the positioning plate 301 is minimized when it is raised, but also ensures that it is in contact with adjacent paper bags. It is worth noting that the time module 6 in this solution is located next to the gluing module 308, and both the time module 6 and the gluing module 308 are sensed by pressing the pressing block 305. The installation height of the time module 6 is the same as that of the gluing module 308. When the gluing module 308 is pressed, the time module 6 is also pressed, which causes the time module 6 to drive the positioning cylinder 303 to reset after being pressed for a certain period of time.

[0031] Furthermore, the adhesive application assembly 4 of this solution also includes a flat bottom plate 409. The flat bottom plate 409 has a slot in its center and is coaxially disposed at the bottom of the sliding tube 405. The bottom surface of the flat bottom plate 409 is flush with the bottom surface of the sliding tube 405 and parallel to the surface of the paper bag. In this solution, when the adhesive application assembly 4 is performing adhesive application, the sliding tube 405 is lowered so that the vertical distance between the sliding tube 405 and the paper bag is equal to the thickness of the adhesive adhered to the paper bag. In addition, the structure of the flat bottom plate 409 can effectively prevent the positioning plate 301 from lifting the end of the paper bag and causing the rest of the paper bag to rise as well. This not only avoids the change in the height of the paper bag from affecting the effect of the sliding tube 405 adhering the adhesive to the paper bag, but also reduces the probability of the paper bag deforming.

[0032] Furthermore, the gluing assembly 4 also includes a horizontal rod 410 and a counterweight 411. One end of the horizontal rod 410 is connected to the output end of the gluing cylinder 408. The axial direction of the horizontal rod 410 is perpendicular to the running direction of the conveyor frame 1. The counterweight 411 is connected to the other end of the horizontal rod 410. The bottom surface of the counterweight 411 is flush with the bottom surface of the flat plate 409. The side wall of the counterweight 411 near the positioning plate 301 and the side wall of the flat plate 409 near the positioning plate 301 are on the same vertical plane. The width of the counterweight 411 is the same as the width of the flat plate 409. Along the central axis of the paper bag, the counterweight 411 and the flat plate 409 are symmetrically arranged at both ends of the paper bag. This is because the sliding tube 40 5. The placement of the paper bag at one end causes the positioning plate 301 to lift the end of the paper bag. At one end, the pressure from the flat bottom plate 409 prevents the paper bag from lifting further, while the other end does not experience a similar force preventing it from lifting. This imbalance in force at both ends of the paper bag leads to a shift in direction when the paper bag begins to descend. To address this, this solution incorporates a balance block 411. Since the balance block 411 is symmetrically positioned at the other end of the paper bag relative to the flat bottom plate 409, both ends of the paper bag experience the same force during lifting, thus preventing deformation due to unilateral force.

[0033] It is worth noting that the reason why this solution controls the sliding tube 405, the flat bottom plate 409, and the balance block 411 to rise and fall instead of always maintaining this height is that, since the paper bag is a flexible material, the front end of the paper bag may bend due to external factors or its own structural factors. Once this height is higher than the height of the bottom surface of the sliding tube 405, the front end of the paper bag will deform when passing through the sliding tube 405, which will cause the device to malfunction.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A square-bottom paper bag making machine, comprising a conveyor frame, characterized in that: Along the operating direction of the conveyor frame, the system also includes two ranging modules, a positioning component, and an adhesive application component. The adhesive application component is mounted on the conveyor frame and is used to apply adhesive to the paper bags passing through it. The positioning component includes a positioning plate, two limiting plates, a positioning cylinder, and a positioning block. The positioning plate is vertically and flexibly mounted on the conveying end surface of the conveyor frame. The two limiting plates are symmetrically arranged at both ends of the surface of the conveyor frame, with the distance between them equal to the width of the paper bag. The two ranging modules are symmetrically arranged at both ends of the bottom of the conveyor frame, with the distance between them equal to the width of the paper bag. Both ranging modules are attached to the side wall of the positioning plate. The adhesive application component includes a coaxially connected fixed tube and a sliding tube. The positioning component also includes a pressing block, a connecting block, a positioning spring, and an adhesive application module. The bottom end of the positioning plate has a pressing groove. The pressing block is slidably disposed within the pressing groove. A connecting slot is also provided on the side wall of the positioning plate, communicating with the pressing groove. One end of the connecting block is connected to the side wall of the pressing block, and the other end extends out of the positioning plate through the connecting slot. The output end of the positioning cylinder is connected to the other end of the connecting block. A positioning spring is disposed within the connecting slot, with its two ends connected to the connecting block and the positioning plate, respectively. The glue-applying module is located directly below the pressing block. The glue-applying assembly also includes a glue-applying cylinder and a syringe. The syringe is vertically mounted on the top of the transmission frame, and the glue-applying cylinder is vertically mounted at the bottom of the syringe. The glue-applying cylinder is connected to the sliding tube, and the glue-applying module is communicatively connected to the glue-applying cylinder. The distance between the glue-applying module and the pressing block is greater than the distance between the positioning block and the bottom surface of the positioning plate.

2. The square-bottom paper bag making machine according to claim 1, characterized in that: The positioning cylinder is vertically mounted at the bottom of the transmission frame. The positioning cylinder controls the positioning plate to move up and down and slide. The positioning block is located at the bottom of the transmission frame and is directly below the positioning plate. The distance between the positioning block and the bottom surface of the positioning plate is equal to the height of the top surface of the positioning plate extending beyond the surface of the transmission frame.

3. A square-bottom paper bag making machine according to claim 2, characterized in that: The glue application assembly includes a glue tank containing glue, an air pump, a syringe, and a valve unit. The syringe is vertically mounted on top of the conveyor frame. The glue tank is connected to the syringe via the air pump and is used to replenish the syringe with glue. The output port of the syringe is located at the top of one end of the paper bag. The valve unit is coaxially disposed at the output port of the syringe and is used to control the opening and closing state of the output port of the syringe.

4. A square-bottom paper bag making machine according to claim 3, characterized in that: The adhesive application assembly includes a fixed tube and a sliding tube connected coaxially. One end of the fixed tube is coaxially connected to the output port of the syringe. The sliding tube is slidably disposed at the other end of the fixed tube. The valve unit includes a plurality of valve parts, which are disposed at equal angles around the central axis of the fixed tube inside the fixed tube. The adhesive application assembly also includes a valve plate, the cross-sectional shape of which is consistent with the cross-sectional shape inside the fixed tube. The valve plate is coaxially disposed inside the fixed tube, and the valve plate has a plurality of valve grooves, which are opened at equal angles along the central axis of the valve plate. A number of valve slots are matched one-to-one with a number of valve parts. Each valve part is set in the corresponding valve slot. The valve part includes a valve block and a connecting rod. The valve block is rotatably set in the corresponding valve slot. The valve block can lock or release its sealing relationship with the valve slot. The two ends of the connecting rod are respectively hinged to the valve block and the sliding tube.

5. A square-bottom paper bag making machine according to claim 4, characterized in that: The adhesive application assembly also includes several limiting blocks, which correspond one-to-one with several valve slots. One end of any limiting block is located on the top of the valve plate, and the other end extends to the top of the corresponding valve slot. The valve block can lock or release its contact with the corresponding limiting block.

6. A square-bottom paper bag making machine according to claim 4, characterized in that: When the pressing block presses the adhesive module, the front end face of the paper bag and the central axis of the sliding tube are on the same vertical plane. When the included angle between the valve block and the valve plate reaches its maximum, the vertical distance between the sliding tube and the paper bag is equal to the thickness of the adhesive adhering to the paper bag.

7. A square-bottom paper bag making machine according to claim 1, characterized in that: The positioning component also includes a time module, which is communicatively connected to the positioning cylinder and the glue application module. The time module controls the positioning cylinder to press the glue application module and then reset it after a certain period of time. When the positioning plate is reset and raised, the side wall surface of the positioning plate that is in contact with the ranging module and the rear end surface of the paper bag are located on the same vertical plane.

8. A square-bottom paper bag making machine according to claim 1, characterized in that: The adhesive coating assembly also includes a flat bottom plate with a slot in the center. The flat bottom plate is coaxially disposed at the bottom of the sliding tube, and the bottom surface of the flat bottom plate is flush with the bottom surface of the sliding tube. The bottom surface of the flat bottom plate is parallel to the surface of the paper bag.

9. A square-bottom paper bag making machine according to claim 8, characterized in that: The glue-applying assembly also includes a horizontal bar and a counterweight. One end of the horizontal bar is connected to the output end of the glue-applying cylinder. The axial direction of the horizontal bar is perpendicular to the running direction of the conveyor frame. The counterweight is connected to the other end of the horizontal bar. The bottom surface of the counterweight is flush with the bottom surface of the flat bottom plate. The side wall of the counterweight near the positioning plate and the side wall of the flat bottom plate near the positioning plate are on the same vertical plane. The width of the counterweight is the same as the width of the flat bottom plate and is along the central axis of the paper bag. The counterweight and the flat bottom plate are symmetrically arranged at both ends of the paper bag.

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