Glue chamber type gluing device and gluing method

Abstract

The present application belongs to the technical field of paste bottoming machine, and particularly relates to a paste bottoming machine glue cavity type gluing device and a gluing method, which comprises two symmetrically arranged glue discharge rollers and a box arranged on one side of the glue discharge rollers; the open side of the box is in close contact with the glue discharge rollers, so that the box and the two glue discharge rollers are mutually enclosed to form a glue storage cavity, the two glue discharge rollers have a gap between them to form a glue discharge opening, and the rotation directions of the two glue discharge rollers are opposite; a glue uniformizing assembly is arranged on the side of the mounting frame opposite to the box, the glue uniformizing assembly extends into the gap between the two glue discharge rollers, and is used for uniformly flowing the glue flowing out of the glue discharge opening. The present application adopts a sealed glue cavity structure, accurately delivers the glue into the glue storage cavity, accurately controls the glue discharge amount and the gluing amount by using the glue discharge opening, reduces the waste of glue, and can be directly applied to the existing paste bottoming machine without the need of greatly modifying the equipment. By arranging the glue uniformizing assembly, sufficient flow guiding is realized, and the glue discharge and gluing can be uniformly and sufficiently performed.

Description

Technical Field

[0001] This invention belongs to the technical field of paste-making machines, and in particular relates to a paste-making machine with a glue-cavity type glue-applying device and glue-applying method. Background Technology

[0002] A bottom-sealing machine is an automated device that seals the bottom of paper bags or composite bags through processes such as folding, gluing, and pasting. The gluing methods used in bottom-sealing machines are generally divided into roller gluing and cavity gluing.

[0003] Roller-type gluing relies on one or more sets of rotating rollers to transfer and apply the glue. The core principle is as follows: the glue is stored in a glue box below; the gluing roller picks up the glue from the box and transfers it to the transfer roller by rotating; the transfer roller then evenly spreads the glue onto the printing roller, which finally prints the glue onto the paper bag.

[0004] Cavity-type gluing is a relatively more "intelligent" contact gluing method. It is usually used in conjunction with a glue supply cylinder (glue cavity) containing glue and a clutch mechanism. Precise gluing is achieved by controlling the separation and adhesion of the gluing roller with the glue supply cylinder and the parts to be glued (such as glue trays).

[0005] Existing glue chamber or roller glue application methods have obvious drawbacks: the presence of multiple rollers results in severe glue spillage and a harsh production environment; secondly, it is impossible to accurately control the glue output, leading to inaccurate glue quantity control, large quality fluctuations, excessive glue waste, long subsequent drying time, and high energy consumption, making it difficult to meet the needs of lean production. Summary of the Invention

[0006] In view of the technical problems existing in the background art, the present invention provides a glue chamber type glue application device and glue application method for a glue paste machine, so as to reduce glue consumption, improve glue application quality, save energy and reduce consumption, and is compatible with existing glue paste machines.

[0007] To achieve the above objectives, the technical solution provided by this invention is as follows: A glue-filling device for a bottom pasting machine includes two symmetrically arranged glue-dispensing rollers and a housing disposed on one side of the glue-dispensing rollers. The two glue-dispensing rollers are arranged vertically and rotatably mounted on a mounting frame. A glue inlet pipe is provided on one side of the housing. The open side of the box is in close contact with the glue dispensing rollers, so that the box and the two glue dispensing rollers enclose each other to form a glue storage cavity, and there is a gap between the two glue dispensing rollers to form a glue outlet; The two dispensing rollers are connected to the drive mechanism, and the two dispensing rollers rotate in opposite directions; A glue-equalizing component is provided on the side of the mounting frame opposite to the housing. The glue-equalizing component extends into the gap between the two glue-dispensing rollers to evenly distribute the glue flowing out from the glue outlet.

[0008] Optionally, the glue distribution assembly includes a first guide portion with a tapered tip and a second guide portion symmetrically arranged on both sides of the rear end of the first guide portion. The second guide portion extends obliquely toward the first guide portion. The first guide portion is directly opposite the glue outlet and is used to evenly distribute the glue flowing out of the glue outlet to the glue dispensing rollers on both sides. There is a glue dispensing gap between the second guide portion and the glue dispensing rollers. The first guide portion, the second guide portion, and the glue dispensing rollers together enclose a secondary glue dispensing cavity.

[0009] Optionally, the uniform adhesive assembly is made of elastic rubber material, and the first guide portion has a first arc-shaped surface on both sides corresponding to the outer contour of the dispensing roller; the second guide portion and the first guide portion are smoothly connected through a second arc-shaped surface.

[0010] Optionally, the glue-spreading assembly is connected to the telescopic mechanism for driving the glue-spreading assembly to move laterally to adjust the distance between the first guide section and the glue outlet, and to adjust the distance between the second guide section and the glue outlet roller.

[0011] Optionally, the mounting frame includes an upper mounting base and a lower mounting base. A fixing frame is vertically arranged on one side of the upper mounting base. The upper end of the housing is tightly attached to the inner wall of the upper mounting base, and the lower end of the housing is tightly attached to the inner wall of the lower mounting base. The two sides of the fixing frame are connected to the housing by screws. Bearing seats are provided on both the upper and lower mounting bases. End caps are provided at both ends of the dispensing roller. A spindle is provided inside the end cap. The upper and lower ends of the spindle are rotatably arranged in the bearing seats.

[0012] Optionally, the upper and lower mounting bases are detachably provided with end sealing assemblies. The end sealing assembly includes a strip-shaped sealing portion. Two circular protruding rings are symmetrically arranged on one side of the strip-shaped sealing portion. Two first circular grooves and a second circular groove corresponding to the protruding rings are arranged sequentially from the inside to the outside on the other side of the strip-shaped sealing portion. The inner diameter of the first circular groove is smaller than the inner diameter of the second circular groove. The two protruding rings of the strip-shaped sealing portion are embedded in the upper or lower mounting base. Both ends of the glue dispensing roller are provided with sealing sections with a diameter smaller than that of the glue dispensing roller. The sealing sections are fitted into the second circular grooves. A plurality of first connecting holes are evenly distributed around the circumference of the protruding rings. A plurality of built-in screws that connect to the upper or lower mounting base are fitted into the first connecting holes. The outer ends of the built-in screws are accommodated in the first circular grooves.

[0013] Optionally, the two sides of the housing are symmetrically provided with side sealing components. The side sealing components include a first sealing element provided at the end of the housing and a second sealing element provided on the outside of the housing. The first sealing element is in close contact with the outer wall of the dispensing roller. The second sealing element includes a mounting block and a scraper provided on one side of the mounting block. The scraper has a drainage groove on the side away from the first sealing element and an avoidance slope on the side of the scraper close to the first sealing element. The scraper, the first sealing element, the housing and the dispensing roller together form a flow guiding cavity.

[0014] Optionally, a retaining ring is provided on the upper end face of the lower mounting base. The inner wall of the retaining ring is in close contact with the outer wall of the strip-shaped sealing part. Both ends of the retaining ring are connected to the side sealing assembly so that the retaining ring and the dispensing roller form a recycling cavity on the bottom side. A return groove communicating with the recycling cavity is opened on the bottom side of the scraper. A recycling pipe is installed through the lower mounting base. A second recycling hole is opened on the strip-shaped sealing part at the upper part of the lower mounting base, which is directly opposite to the recycling pipe.

[0015] Optionally, the first guide section has an internal mounting hole, and flat first glue outlet grooves are formed on both sides of the mounting hole. The first glue outlet grooves are connected to the glue secondary distribution cavity. A glue supply tube is provided inside the mounting hole, and the mounting connector at the upper end of the glue supply tube is connected to the top of the first guide section by a screw. The glue supply tube has three second glue outlet grooves at 90-degree intervals around its circumference. By adjusting the installation angle of the glue supply tube, the glue supply tube can be connected to one of the first glue outlet grooves on either side, or the glue supply tube can be connected to both of the first glue outlet grooves on both sides.

[0016] A method for applying adhesive using a glue chamber type glue applicator for a paste-making machine: S1, using the glue distribution component to approach and close the glue outlet, pressurized glue is then introduced into the glue storage chamber; S2. After the glue storage chamber is filled with glue, the distance between the glue distribution component and the glue outlet is adjusted by the glue distribution component, and the glue dispensing roller is started. The two glue dispensing rollers rotate in opposite directions, so that the glue flows out evenly from the glue outlet and is evenly guided to the glue dispensing rollers on both sides through the first guide part of the glue distribution component. S3 can selectively fill the glue secondary distribution cavity with glue, so that the glue dispensing roller is coated twice in the secondary distribution cavity. The glue transferred to the surface of the glue dispensing roller forms a glue layer of uniform thickness after passing through the second guide section.

[0017] The present invention has the following advantages and beneficial effects: The device utilizes a sealed glue chamber formed by a housing and two glue dispensing rollers. Pressurized glue is precisely delivered into the chamber, and the glue dispensing and application amounts are precisely controlled by the gap between the rollers (the glue outlet) and the rotation of the two rollers, minimizing glue waste. This device can be directly applied to existing glue applicators without significant modifications. The precise glue dispensing through the rotation of two symmetrically positioned rollers also reduces glue spillage.

[0018] By installing a glue-equalizing component at the glue outlet, which extends into the gap between the two glue-equalizing rollers, the glue flowing out of the glue outlet is evenly distributed, achieving sufficient flow guidance and ensuring that the glue-equalizing rollers can dispense and apply glue uniformly and in sufficient quantity. Furthermore, using the glue-equalizing component for flow guidance also enables the recovery and guidance of glue splashed at the glue outlet position of the glue rollers, while blocking the area directly in front of the glue outlet to prevent pressurized glue spraying and splashing. This ensures both uniform and controllable glue dispensing and glue guidance and recovery, reducing waste. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the glue chamber type glue applicator of the present invention installed on the bottom side of the glue paste machine; Figure 2 This is one of the structural diagrams of the adhesive cavity type gluing device of the present invention; Figure 3 This is the second structural diagram of the adhesive cavity type adhesive application device of the present invention; Figure 4 This is a front view of the adhesive cavity type adhesive application device of the present invention; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 for Figure 4 A cross-sectional view along the BB direction; Figure 7 for Figure 6 A magnified view of a portion of point a; Figure 8 for Figure 5 One of the cross-sectional views of a medium-density glue application device with a glue distribution component; Figure 9 for Figure 5 A second cross-sectional view of the glue distribution component in a medium-density glue application device; Figure 10 for Figure 8 A magnified view of a section at point b in the middle; Figure 11 for Figure 8 A magnified view of a portion at point d in the middle; Figure 12 for Figure 9 A magnified view of a section at point c in the middle; Figure 13 This is one of the structural diagrams of the homogenizing assembly in this invention; Figure 14 for Figure 13 A bottom view; Figure 15 This is the second structural diagram of the homogenizing assembly in this invention; Figure 16 for Figure 15 A bottom view; Figure 17 for Figure 15 A sectional view; Figure 18 This is a structural diagram of the retaining ring in this invention; Figure 19 This is a structural diagram of the second sealing element in this invention; Figure 20 for Figure 19 Top view; Figure 21 for Figure 19 A magnified view of a section at point e in the middle; Figure 22 This is a structural diagram of the upper mounting base in this invention; Figure 23 This is a cross-sectional view of the upper mounting base in this invention; Figure 24 This is a structural diagram of the lower mounting base in this invention; Figure 25 This is a cross-sectional view of the lower mounting base in this invention; Figure 26 This is one of the structural diagrams of the end sealing assembly in this invention; Figure 27 This is the second structural diagram of the end sealing assembly in this invention; Figure 28 This is a cross-sectional view of the end sealing assembly in this invention; Figure 29 This is the third structural diagram of the end sealing assembly in this invention; Figure 30 This is a structural diagram of the adhesive supply assembly in this invention.

[0020] Reference numerals: 1-Gluing machine, 11-Mounting shaft, 12-Intermediate roller, 2-Gluing device, 3-Upper mounting base, 31-Fixing frame, 311-Limiting groove, 32-Horizontal plate, 33-First shaft hole, 34-First mounting hole, 35-Positioning groove, 36-Positioning post, 37-Connecting block, 4-Lower mounting base, 41-Fixing block, 42-Retaining ring, 421-Connecting part, 422-Second connecting hole, 43 44-Recovery pipe, 5-First recovery hole, 5-Box body, 5a-Glue storage chamber, 5b-Guide chamber, 51-Glue inlet pipe, 52-Cover plate, 53-Handle, 54-Second seal, 541-Mounting block, 542-Scraper, 543-Drainage channel, 544-Avoidance slope, 545-Return groove, 546-Slot, 55-First seal, 6-Dispensing roller, 6a-Dispensing port, 6b-Secondary glue application Distribution chamber, 61-mandrel, 611-drive shaft, 612-gear, 613-turbine, 614-worm gear, 62-end cap, 63-limiting ring, 64-bearing, 65-bearing seat, 66-bearing seat screw, 67-positioning sleeve, 68-built-in screw, 7-strip sealing part, 71-convex ring, 72-first connecting hole, 73-first circular groove, 74-second circular groove, 75-second recovery hole, 8-vertical plate, 81-guide hole, 82-cylinder, 9-gluing assembly, 91-first guide part, 911-first arc-shaped surface, 912-second arc-shaped surface, 92-second guide part, 93-guide rod, 94-first recovery groove, 95-second recovery groove, 96-mounting hole, 97-first dispensing groove, 10-gluing assembly, 101-mounting connector, 102-gluing tube, 103-second dispensing groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] Example like Figures 1-6As shown, a glue chamber type glue applicator for a bottom paste machine is disclosed. The glue applicator 2 is used on the bottom paste machine 1. It includes two symmetrically arranged glue discharge rollers 6 and a housing 5 arranged on one side of the glue discharge rollers 6. The two glue discharge rollers 6 are arranged vertically and rotatably mounted on the mounting frame. A glue inlet pipe 51 is provided on one side of the housing 5 for connecting to an external glue supply device.

[0024] like Figures 1-10 As shown, the open side of the housing 5 is in close contact with the two dispensing rollers 6, so that the housing 5 and the two dispensing rollers 6 enclose each other to form a glue storage cavity 5a (as shown). Figure 5 As shown), the glue inlet pipe 51 supplies glue into the glue storage chamber 5a; there is a gap between the two glue outlet rollers 6 to form the glue outlet 6a (as shown). Figure 10 As shown, the glue in the glue storage chamber 5a flows out / is squeezed out from the glue outlet 6a as the two glue dispensing rollers 6 rotate, and is coated on the glue dispensing rollers 6.

[0025] The two dispensing rollers 6 are connected to the drive mechanism, and the two dispensing rollers 6 rotate in opposite directions to ensure uniform and controllable dispensing of glue.

[0026] like Figures 1-9 As shown, a glue-equalizing assembly 9 is installed on the side of the mounting frame opposite to the housing 5. Specifically, the glue-equalizing assembly 9 and the housing 5 are respectively located on both sides of the glue dispensing rollers 6. The glue-equalizing assembly 9 extends into the gap between the two glue dispensing rollers 6 and faces the glue outlet 6a, used to evenly distribute the glue flowing from the glue outlet 6a. The glue-equalizing assembly 9 maintains a fixed distance from the glue outlet 6a to achieve glue equalization, and also seals the glue outlet 6a.

[0027] like Figures 1-5 , Figures 8-10 , Figures 12-17 As shown, the glue distribution assembly 9 includes a first guide portion 91 with a tapered tip, and second guide portions 92 symmetrically arranged on both sides of the rear end of the first guide portion 91. The second guide portions 92 extend obliquely towards the first guide portion 91. The first guide portion 91 is directly opposite the glue outlet 6a and is used to evenly distribute the glue flowing out of the glue outlet 6a to the glue dispensing rollers 6 on both sides. There is a glue dispensing gap between the second guide portion 92 and the glue dispensing rollers 6. The first guide portion 91, the second guide portion 92, and the glue dispensing rollers 6 enclose a secondary glue dispensing cavity 6b (e.g., ...). Figure 10 and Figure 12 (As shown).

[0028] In this structure, after the glue exits through the glue outlet 6a, due to the rotational characteristics of the glue dispensing roller 6 and the pressure dispensing characteristics, it is difficult for the glue outlet 6a to evenly coat all the glue on both sides of the glue dispensing roller 6. Some glue will be uncontrollably sprayed or thrown out in front of the glue outlet 6a. Therefore, after setting the first guide part 91 and the second guide part 92, the glue can be evenly distributed at the glue outlet 6a by the first guide part 91, so that the glue is evenly and sufficiently coated on the surface of the glue dispensing roller 6. At the same time, the guide part 92 is used to guide the flow and prevent the glue from being thrown out disorderly. The glue can be guided and recycled. The end of the second guide part 92 is used again to scrape the glue on the surface of the glue dispensing roller 6 evenly, ensuring that the glue is dispensed in sufficient quantity and controlling the uniformity of the glue coating thickness on the glue dispensing roller 6, so as to achieve orderly guidance and collection of glue.

[0029] In this invention, the glue distribution component 9 can be made of elastic rubber material. The first guide part 91 has a first arc-shaped surface 911 on both sides corresponding to the outer contour of the glue dispensing roller 6. When the glue distribution component 9 moves towards the glue dispensing port 6a, it can completely block the glue dispensing port 6a and stick to the surface of the glue dispensing roller 6 to achieve controllable sealing. In this way, when supplying glue to the glue storage chamber 5a in the early stage, the glue dispensing port 6a can be closed first, and after the glue storage chamber 5a is filled with glue, the glue dispensing port 6a can be opened to achieve uniform and controllable glue dispensing. The second guide section 92 and the first guide section 91 are smoothly connected by the second arc-shaped surface 912. This allows for precise flow guidance and recycling during glue dispensing. After the glue is fully and evenly distributed by the first guide section 91, some of the glue can be guided and recycled along the second guide section 92. The glue guided by the second guide section 92 can eventually be recycled by its own weight. At the same time, the glue that is ejected by inertia or sprayed under pressure can fill the glue secondary distribution cavity 6b, ensuring that the glue inside the glue secondary distribution cavity 6b can repeatedly act on the glue dispensing roller 6, ensuring the coating amount of the glue dispensing roller 6.

[0030] like Figures 1-6 As shown, the glue distribution assembly 9 is connected to the telescopic mechanism, which drives the glue distribution assembly 9 to move laterally to adjust the distance between the first guide section 91 and the glue outlet 6a, and to adjust the distance between the second guide section 92 and the glue dispensing roller 6. This design allows for adjustment of the distance between the first guide section 91 and the glue outlet 6a to control the glue dispensing volume, and simultaneously, adjustment of the distance between the second guide section 92 and the glue dispensing roller 6 to control the thickness of the glue coating layer on the glue dispensing roller 6.

[0031] like Figures 1-9 , Figures 22-29As shown, the mounting frame includes an upper mounting base 3 and a lower mounting base 4. The upper mounting base 3 and the lower mounting base 4 have identical internal opening structures for mounting the dispensing roller 6. Two fixing brackets 31 are vertically arranged on one side of the upper mounting base 3. The upper end of the housing 5 is tightly fitted against the inner wall of the upper mounting base 3 for limiting its position, and the lower end of the housing 5 is tightly fitted against the inner wall of the lower mounting base 4 for limiting its position. The two sides of the fixing brackets 31 are connected to the housing 5 by screws, thereby fixing the housing 5 to the inner side of the two fixing brackets 31. Bearing seats 65 are installed on both the upper mounting base 3 and the lower mounting base 4 by screws. End caps 62 are provided at both ends of the dispensing roller 6. A spindle 61 is installed inside the end cap 62. The upper and lower ends of the spindle 61 are rotatably mounted within the bearing seats 65, enabling the dispensing roller 6 to be rotated and installed.

[0032] like Figure 2 As shown, a fixing block 41 is vertically installed on one side of the lower mounting base 4, and the fixing block 41 is tightly attached to the outer wall of the bottom side of the housing 5 and connected by screws. In this way, the upper mounting base 3, the lower mounting base 4 and the housing 5 are connected into one unit.

[0033] like Figure 2 As shown, a cover plate 52 is provided on the rear side of the box body 5, and a handle 53 is provided on the cover plate 52. A horizontal plate 32 is provided on the bottom side of the two fixing brackets 31 by screws. The horizontal plate 32 is close to the cover plate 52, and the horizontal plate 32 is connected to the cover plate 52 by screws. Thus, a stable connection of the box body 5 is further achieved in the middle position of the box body 5.

[0034] like Figures 1-3 , Figure 13 and Figure 15 The telescopic mechanism includes a vertical plate 8 and a cylinder 82. Several guide rods 93 are evenly distributed on the rear side of the first flow guide 91. The upper end of the vertical plate 8 is connected to the upper mounting base 3, and the lower end is connected to the lower mounting base 4. Several guide holes 81 are provided on the vertical plate 8, and the guide rods 93 are slidably disposed in the guide holes 81. A cylinder 82 is provided at each of the upper and lower ends of the vertical plate 8. The telescopic end of the cylinder 82 is connected to the first flow guide 91, and the position of the uniform adhesive assembly 9 is adjusted by driving the cylinder 82 to telescopically extend and retract.

[0035] like Figure 2 As shown, the glue inlet pipe 51 is located on the bottom side of the cover plate 52 and on the upper side of the fixing block 41 to avoid the various mounting structures.

[0036] like Figures 1-9 , Figures 22-29 As shown, the upper mounting base 3 and the lower mounting base 4 are detachably equipped with end sealing components. The end sealing components are mainly used to tightly adhere to both ends of the dispensing roller 6 to prevent glue from overflowing into the dispensing roller 6.

[0037] like Figures 1-9 , Figures 22-29As shown, the end sealing assembly includes a strip-shaped sealing portion 7. Two circular protruding rings 71 are symmetrically arranged on one side of the strip-shaped sealing portion 7. On the other side of the strip-shaped sealing portion 7, two first circular grooves 73 and a second circular groove 74, corresponding to the protruding rings 71, are arranged sequentially from the inside out. The inner diameter of the first circular groove 73 is smaller than the inner diameter of the second circular groove 74. The two protruding rings 71 of the strip-shaped sealing portion 7 are embedded in the upper mounting base 3 or the lower mounting base 4.

[0038] like Figures 22-25 As shown, specifically, the internal opening structure of the upper mounting base 3 and the lower mounting base 4 is the same, both of which are provided with two first shaft holes 33. The bottom side of the first shaft hole 33 is provided with a first mounting hole 34 with an inner diameter larger than the first shaft hole 33. The first shaft hole 33 and the first mounting hole 34 form a stepped hole. One side of the upper mounting base 3 and the lower mounting base 4 is provided with a positioning groove 35 that matches the contour of the strip-shaped sealing part 7. One positioning groove 35 connects to two first mounting holes 34 at the same time.

[0039] like Figure 7 , Figures 22-25 As shown, during installation, the shaft sections at both ends of the dispensing roller 6 extend into the internal opening structures of the upper mounting base 3 and the lower mounting base 4, and the bearing housing 65 and bearing 64 are fitted into the first shaft hole 33 to fix the spindle 61 of the dispensing roller 6. The bearing housing 65 is fixed by bearing housing screws 66.

[0040] like Figures 22-25 As shown, a positioning sleeve 67 is inserted into the first mounting hole 34. One end of the positioning sleeve 67 extends into the first shaft hole 33 to position and install the bearing 64. A strip-shaped sealing part 7 is tightly fitted on the outside of the positioning sleeve 67, so that the convex ring 71 of the strip-shaped sealing part 7 abuts against the positioning sleeve 67. The convex ring 71 is set in the first mounting hole 34. Then, the built-in screw 68 passes through the convex ring 71 and the positioning sleeve 67 to stably press and connect them in the first mounting hole 34. At the same time, the outside of the strip-shaped sealing part 7 is tightly fitted against the positioning groove 35 to achieve a seal, and the end of the glue dispensing roller 6 is tightly fitted against the inner wall of the second circular groove 74 to achieve a reliable seal. The outer end of the built-in screw 68 is accommodated in the first circular groove 73 to achieve clearance installation.

[0041] like Figure 7 As shown, sealing sections with a smaller diameter than the dispensing roller 6 are provided at both ends of the dispensing roller 6. The sealing sections are fitted into the second circular groove 74 to achieve a reliable seal.

[0042] like Figure 7 and Figure 26 As shown, the circumference of the convex ring 71 is evenly distributed with a number of first connecting holes 72. A number of built-in screws 68 that are connected to the upper mounting base 3 or the lower mounting base 4 are fitted in the first connecting holes 72. The outer ends of the built-in screws 68 are accommodated in the first circular groove 73.

[0043] like Figures 2-25 As shown, side sealing assemblies are symmetrically arranged on both sides of the housing 5 to achieve sealing between the housing 5 and the dispensing roller 6.

[0044] like Figures 2-9 , Figure 11 , Figures 19-21 As shown, the side sealing assembly includes a first sealing member 55 disposed at the end of the housing 5 and a second sealing member 54 disposed on the outside of the housing 5. The first sealing member 55 is disposed in the groove at the end of the housing 5. One end of the first sealing member 55 has the same shape as the glue dispensing roller 6. The first sealing member 55 is in close contact with the outer wall of the glue dispensing roller 6 to achieve a reliable seal and prevent glue from overflowing from the glue storage cavity 5a.

[0045] like Figures 2-9 , Figure 11 , Figures 19-21 As shown, the second sealing element 54 includes a mounting block 541 and a scraper 542 disposed on one side of the mounting block 541. A limiting groove 311 is formed on the inner side of the fixing frame 31, and the mounting block 541 is fitted into the limiting groove 311. The upper and lower ends of the mounting block 541 and the scraper 542 form a slot 546, which engages with the upper and lower strip sealing parts 7 to achieve a reliable seal. The mounting block 541 and the side wall of the housing 5 are connected by several screws. A flow-guiding groove 543 is formed on the side of the scraper 542 away from the first sealing element 55, and an avoidance slope 544 is formed on the side of the scraper 542 close to the first sealing element 55. The scraper 542, the first sealing element 55, the housing 5, and the glue dispensing roller 6 together form a flow-guiding cavity 5b. When the dispensing roller 6 rotates, the excess glue is first scraped off by the scraper 542. The scraped glue can be guided and recycled through the diversion groove 543, thereby reducing the amount of glue in the subsequent flow and thus reducing the amount of glue in the diversion cavity 5b. Since the first seal 55 is tightly sealed against the dispensing roller 6, the remaining small amount of glue will be reliably blocked and recycled in the diversion cavity 5b. Through the step-like, multi-stage scraping, reliable recycling and reliable sealing are achieved.

[0046] like Figures 2-9 , Figure 11 , Figures 18-21 As shown, a retaining ring 42 is provided on the upper end face of the lower mounting base 4. The inner wall of the retaining ring 42 is in close contact with the outer wall of the strip-shaped sealing part 7. Both ends of the retaining ring 42 are connected to the side sealing assembly so that the retaining ring 42 and the dispensing roller 6 form a recycling cavity on the bottom side. Connecting parts 421 are provided on both sides of the retaining ring 42. Second connecting holes 422 are provided on the connecting parts 421. The connecting parts 421 are in close contact with the surface of the mounting block 541 and are connected by screws.

[0047] like Figures 2-9 , Figure 11 , Figures 18-21As shown, the scraper 542 has a glue return groove 545 on its bottom side that communicates with the recovery chamber, which can recover the glue in the guide chamber 5b to the bottom side of the device, i.e., inside the retaining ring 42.

[0048] like Figure 3 , Figure 11 , Figures 18-21 , Figure 29 As shown, a recycling pipe 43 is installed through the lower mounting base 4, and a first recycling hole 44 is formed through the lower mounting base 4, with the recycling pipe 43 disposed in the first recycling hole 44. A second recycling hole 75 is formed on the strip-shaped sealing part 7 at the upper part of the lower mounting base 4, which is directly opposite the first recycling hole 44. In this way, the recycled glue can be guided downward through the recycling pipe 43 into the interior of the retaining ring 42, and then recycled sequentially through the recycling hole 75, the first recycling hole 44, and the recycling pipe 43.

[0049] As a preferred embodiment of the present invention, such as Figure 8 , Figure 13 and Figure 14 As shown, the bottom side of the first guide section 91 is provided with a first recycling groove 94 and two second recycling grooves 95. The first recycling groove 94 is located on the rear side of the first guide section 91, and the second recycling grooves 95 are connected to the first recycling groove 94. The second recycling grooves 95 are located between the first guide section 91 and the second guide section 92, and are connected to the glue secondary distribution cavity 6b. With this design, no matter how the relative position of the first guide section 91 and the glue outlet 6a is adjusted, its bottom is grooved, allowing the glue (inside the retaining ring 42 and the glue secondary distribution cavity 6b) to flow through the first recycling groove 94 and the second recycling groove 95 to the second recycling hole 75, ultimately achieving recycling.

[0050] As another preferred embodiment of the present invention, such as Figure 9 , Figure 12 , Figures 15-17 and Figure 30 As shown, the first guide section 91 has an installation hole 96 inside, and flat first glue outlet grooves 97 are formed on both sides of the installation hole 96. The first glue outlet grooves 97 are connected to the glue secondary distribution cavity 6b. The first guide section 91 is provided with a glue supply assembly 10, which includes a glue supply tube 102 and an installation connector 101. The glue supply tube 102 is provided inside the installation hole 96. The installation connector 101 at the upper end of the glue supply tube 102 is connected to the top end of the first guide section 91 by a screw. The glue supply tube 102 has three second glue outlet grooves 103 at 90-degree intervals around its circumference. By adjusting the installation angle of the glue supply tube 102, the glue supply tube 102 can be connected to one of the first glue outlet grooves 97 on any side, or the glue supply tube 102 can be connected to both of the first glue outlet grooves 97 on both sides.

[0051] like Figure 12As shown, at this time, only the upper first glue outlet 97 is in a connected state; therefore, glue will only flow into the upper glue secondary distribution cavity 6b. Rotating the angle of the glue supply pipe 102 can also connect the lower first glue outlet 97, or both the upper and lower first glue outlets 97. In specific use, it depends on the connection state between the two glue outlet rollers 6 and the rear intermediate roller 12.

[0052] like Figure 1 , Figure 8 and Figure 9 As shown, in one type of gluing method, only one dispensing roller 6 is tightly connected and driven by the intermediate roller 12. Therefore, only one dispensing roller 6 needs to transfer the glue to the intermediate roller 12. In this case, glue is simply filled into the secondary glue distribution cavity 6b at the dispensing roller 6 connected to the intermediate roller 12. Glue is not needed in the secondary glue distribution cavity 6b on the other side, thus achieving efficient glue recycling. However, if both dispensing rollers 6 are connected to different intermediate rollers 12 to achieve multi-station gluing operations, then glue needs to be filled into both secondary glue distribution cavities 6b.

[0053] In summary, this application allows for selection based on specific adhesive application conditions. When applying adhesive using a single dispensing roller 6, adhesive only needs to be dispensed from one side, while the other side is used for adhesive recycling. This ensures the amount of adhesive dispensed, the amount of adhesive applied, and the uniformity of the adhesive application, while also achieving efficient recycling of excess adhesive.

[0054] like Figures 1-3 As shown, the gluing device 2 is used on the base coater 1. A fixing mechanism is provided on the upper mounting base 3, and the fixing mechanism is connected to the base of the base coater 1. The fixing mechanism includes a positioning post 36, a connecting block 37, etc.

[0055] like Figures 1-3 , Figure 7 As shown, a drive shaft 611 is provided at the upper end of the spindle 61, and a gear 612 is provided on the outside of the drive shaft 611. The two gears 612 mesh with each other for transmission. A worm gear 613 is provided on one of the drive shafts 611. The worm gear 613 cooperates with the worm 614, and the worm gear 614 is driven to rotate by the drive assembly, so as to realize the synchronous rotation of the two glue dispensing rollers 6.

[0056] like Figure 1 As shown, the length of the intermediate roller 12 is much shorter than the length of the dispensing roller 6, and the intermediate roller 12 is detachably mounted on the mounting shaft 11. In this way, the intermediate roller 12 of the appropriate length can be selected according to the size of the workpiece to be coated, thereby realizing adhesive coating operations of various sizes.

[0057] A method for applying adhesive using a glue chamber type glue applicator for a paste-making machine, comprising the following steps: S1, the glue distribution component 9 is brought close to the glue outlet 6a and then closed (when the first guide part 91 closes the glue outlet 6a, the second guide part 92 is pressed against the outer wall of the glue dispensing roller 6 to achieve secondary sealing), and then pressurized glue is introduced into the glue storage chamber 5a.

[0058] S2. After the glue storage chamber 5a is filled with glue, the distance between the glue distribution component 9 and the glue outlet 6a is adjusted by the glue distribution component 9, and the glue dispensing roller 6 is started. The two glue dispensing rollers 6 rotate in opposite directions, so that the glue flows out evenly from the glue outlet 6a and is evenly guided to the glue dispensing rollers 6 on both sides by the first guide part 91 of the glue distribution component 9, thus realizing the first glue application operation.

[0059] S3, adhesive can be selectively filled into the secondary adhesive distribution cavity 6b, so that the dispensing roller 6 is coated twice in the secondary distribution cavity, and the adhesive transferred to the surface of the dispensing roller 6 forms an adhesive layer of uniform thickness after passing through the second guide section 92.

[0060] This invention employs a sealed glue chamber structure, precisely delivering glue through two rotating glue rollers 6. A glue-equalizing component 9 regulates and controls the glue application amount and uniformity, allowing for real-time fine-tuning to ensure stable glue application quality while simultaneously recovering excess glue. This design completely solves the glue spillage problem, improves the production environment, and reduces cleaning costs; the precise and controllable glue application amount enhances glue application quality and reduces the finished product defect rate; reduced glue consumption shortens drying time, lowers equipment energy consumption, and saves production costs; it is compatible with various paper bag specifications, meeting lean manufacturing needs while balancing environmental protection and high efficiency.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A glue-filling device for a paste-making machine, characterized in that: It includes two symmetrically arranged dispensing rollers and a housing disposed on one side of the dispensing rollers. The two dispensing rollers are arranged vertically and rotatably mounted on the mounting frame. A glue inlet pipe is provided on one side of the housing. The open side of the box is in close contact with the two dispensing rollers, so that the box and the two dispensing rollers enclose each other to form a glue storage cavity, and there is a gap between the two dispensing rollers to form a glue outlet; The two dispensing rollers are connected to the drive mechanism, and the two dispensing rollers rotate in opposite directions; A glue-equalizing component is provided on the side of the mounting frame opposite to the housing. The glue-equalizing component extends into the gap between the two glue-dispensing rollers to evenly distribute the glue flowing out from the glue outlet.

2. The glue-filling device for a paste-making machine according to claim 1, characterized in that: The glue distribution assembly includes a first guide portion with a tapered tip and a second guide portion symmetrically arranged on both sides of the rear end of the first guide portion. The second guide portion extends obliquely toward the first guide portion. The first guide portion is directly opposite the glue outlet and is used to evenly distribute the glue flowing out of the glue outlet to the glue dispensing rollers on both sides. There is a glue dispensing gap between the second guide portion and the glue dispensing rollers. The first guide portion, the second guide portion and the glue dispensing rollers together enclose a secondary glue dispensing cavity.

3. The glue-filling device for a paste-making machine according to claim 2, characterized in that: The uniform adhesive assembly is made of elastic rubber material. The first guide section has a first arc-shaped surface on both sides that corresponds to the outer contour of the dispensing roller. The second guide section and the first guide section are smoothly connected through a second arc-shaped surface.

4. The glue-filling device for a paste-making machine according to claim 2, characterized in that: The glue-spreading assembly is connected to the telescopic mechanism and is used to drive the glue-spreading assembly to move laterally to adjust the distance between the first guide section and the glue outlet, and to adjust the distance between the second guide section and the glue outlet roller.

5. The glue-filling device for a paste-making machine according to claim 1, characterized in that: The mounting frame includes an upper mounting base and a lower mounting base. A fixing frame is vertically arranged on one side of the upper mounting base. The upper end of the housing is tightly attached to the inner wall of the upper mounting base, and the lower end of the housing is tightly attached to the inner wall of the lower mounting base. The two sides of the fixing frame are connected to the housing by screws. Bearing seats are provided on both the upper and lower mounting bases. End caps are provided at both ends of the dispensing roller. A spindle is provided inside the end cap. The upper and lower ends of the spindle are rotatably arranged in the bearing seats.

6. The glue-filling device for a paste-making machine according to claim 5, characterized in that: The upper and lower mounting bases are detachably equipped with end sealing assemblies. The end sealing assembly includes a strip-shaped sealing portion. Two circular protruding rings are symmetrically arranged on one side of the strip-shaped sealing portion. Two first circular grooves and a second circular groove corresponding to the protruding rings are arranged sequentially from the inside to the outside on the other side of the strip-shaped sealing portion. The inner diameter of the first circular groove is smaller than the inner diameter of the second circular groove. The two protruding rings of the strip-shaped sealing portion are embedded in the upper or lower mounting base. Both ends of the glue dispensing roller are provided with sealing sections with a diameter smaller than that of the glue dispensing roller. The sealing sections are fitted into the second circular grooves. A plurality of first connecting holes are evenly distributed around the circumference of the protruding rings. A plurality of built-in screws that connect to the upper or lower mounting base are fitted into the first connecting holes. The outer ends of the built-in screws are accommodated in the first circular grooves.

7. The glue-filling device for a paste-making machine according to claim 5, characterized in that: The box body is symmetrically provided with side sealing components on both sides. The side sealing components include a first sealing element provided at the end of the box body and a second sealing element provided on the outside of the box body. The first sealing element is in close contact with the outer wall of the dispensing roller. The second sealing element includes a mounting block and a scraper provided on one side of the mounting block. The scraper has a drainage groove on the side away from the first sealing element and an avoidance slope on the side of the scraper close to the first sealing element. The scraper, the first sealing element, the box body and the dispensing roller together form a flow guiding cavity.

8. The glue-filling device for a paste-making machine according to claim 7, characterized in that: A retaining ring is provided on the upper end face of the lower mounting base. The inner wall of the retaining ring is in close contact with the outer wall of the strip-shaped sealing part. Both ends of the retaining ring are connected to the side sealing assembly so that the retaining ring and the dispensing roller form a recycling cavity on the bottom side. A return groove communicating with the recycling cavity is opened on the bottom side of the scraper. A recycling pipe is installed through the lower mounting base. A second recycling hole is opened on the strip-shaped sealing part at the upper part of the lower mounting base, which is directly opposite to the recycling pipe.

9. The glue-filling device for a paste-making machine according to claim 2, characterized in that: The first guide section has an internal mounting hole, and flat first glue outlet grooves are formed on both sides of the mounting hole. The first glue outlet grooves are connected to the glue secondary distribution cavity. A glue supply tube is provided inside the mounting hole. The mounting connector at the upper end of the glue supply tube is connected to the top of the first guide section by a screw. The glue supply tube has three second glue outlet grooves at 90-degree intervals around its circumference. By adjusting the installation angle of the glue supply tube, the glue supply tube can be connected to one of the first glue outlet grooves on any side, or the glue supply tube can be connected to both of the first glue outlet grooves on both sides.

10. A method for applying adhesive using the adhesive cavity type adhesive applicator of a paste-making machine according to any one of claims 1-9, characterized in that: S1, using the glue distribution component to approach and close the glue outlet, pressurized glue is then introduced into the glue storage chamber; S2. After the glue storage chamber is filled with glue, the distance between the glue distribution component and the glue outlet is adjusted by the glue distribution component, and the glue dispensing roller is started. The two glue dispensing rollers rotate in opposite directions, so that the glue flows out evenly from the glue outlet and is evenly guided to the glue dispensing rollers on both sides through the first guide part of the glue distribution component. S3 can selectively fill the glue secondary distribution cavity with glue, so that the glue dispensing roller is coated twice in the secondary distribution cavity. The glue transferred to the surface of the glue dispensing roller forms a glue layer of uniform thickness after passing through the second guide section.

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