Gluing device

Abstract

The present application provides a kind of gluing device, for gluing to cigarette package, comprising: glue nozzle, input end is connected with glue supply system, output end is equipped with glue outlet;Ball, be located in the inside of glue nozzle, and can rotate around its ball center, the diameter of glue outlet is less than the diameter of ball, and ball partially protrudes from glue outlet;First permanent magnet, be located in the inside of glue nozzle, and located the side of ball away from glue outlet;Second permanent magnet, be located in the inside of glue nozzle, and located the side of first permanent magnet away from glue outlet, the same pole of first permanent magnet and second permanent magnet is arranged, and second permanent magnet is used to apply thrust to first permanent magnet and ball;Limiting block, be located in the inside of glue nozzle, and located the side of second permanent magnet away from glue outlet, limiting block is connected with the inner wall of glue nozzle by screw thread, and limiting block is used to limit the distance between second permanent magnet and first permanent magnet.The present application can improve the stability of glue control of gluing device.

Description

Technical Field

[0001] This invention relates to the field of cigarette packaging technology, and in particular to an adhesive coating device. Background Technology

[0002] The GD-type packaging machine is a crucial piece of production equipment in cigarette factories. This machine uses a ball-type glue gun to apply glue to the carton and the lid flaps of individual packs. However, after prolonged operation, the ball-type glue gun is prone to fatigue. This fatigue can cause abnormal glue spraying from the gun's output end, leading to problems such as adhesion inside the carton and contamination of the label paper. In actual production, the unpredictable fatigue of the glue gun spring poses a significant risk to product quality. Especially when the packaging machine is running at high speed, glue gun fatigue can directly result in a large number of defective products. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problem of unstable adhesive control in adhesive coating devices. This invention provides an adhesive coating device that can improve the stability of adhesive control.

[0004] To solve the above-mentioned technical problems, embodiments of the present invention provide an adhesive application apparatus, comprising:

[0005] The glue applicator has an internal receiving cavity extending in a first direction. The two ends of the glue applicator in the first direction are an input end and an output end, respectively. The input end is connected to the glue supply system, and the output end is provided with a glue outlet.

[0006] The ball is located inside the receiving cavity and can rotate around its own center. The diameter of the glue outlet is smaller than the diameter of the ball, and the ball partially protrudes outside the glue outlet.

[0007] The first permanent magnet is located inside the receiving cavity and on the side of the ball away from the outlet.

[0008] The second permanent magnet is disposed in the receiving cavity and located on the side of the first permanent magnet away from the glue outlet. The first permanent magnet and the second permanent magnet are arranged with the same pole facing each other. The second permanent magnet is used to apply a thrust toward the glue outlet to the first permanent magnet and the ball.

[0009] A limiting block is disposed in the receiving cavity and located on the side of the second permanent magnet away from the glue outlet. The limiting block is threadedly connected to the inner wall of the glue applicator and is used to limit the distance between the second permanent magnet and the first permanent magnet.

[0010] Optionally, a bracket is provided between the first permanent magnet and the ball, the bracket being used to define the radial position of the ball along the glue outlet so that the ball is located in the middle of the glue outlet.

[0011] Optionally, the bracket includes an annular base connected to a first permanent magnet. Multiple claws are provided on the end face of the base facing the dispensing port. The claws are evenly distributed along the circumference of the base, and balls are located between the claws, with each ball contacting one of the claws.

[0012] Optionally, both the first and second permanent magnets are neodymium iron boron permanent magnets.

[0013] Optionally, the distance between the second permanent magnet and the first permanent magnet satisfies a functional relationship:

[0014] L = μSM 2 / α

[0015] Where L is the distance between the first and second permanent magnets, in mm; α is the correction coefficient, in N / m; and μ is the free permeability, in N / A. 2 S represents the magnetic pole area between the first and second permanent magnets, in meters (m²). 2 The magnetization intensity of the neodymium iron boron permanent magnet described in M ​​is expressed in A / m.

[0016] Optionally, the distance between the second permanent magnet and the first permanent magnet is 1.5 to 2 mm.

[0017] Optionally, both the first permanent magnet and the second permanent magnet are magnetic rings, and the outer diameters of the first permanent magnet and the second permanent magnet are equal.

[0018] Optionally, it also includes a glue delivery tube, the input end of which is connected to the glue supply system, and the output end of which is connected to the input end of the glue applicator. The limiting block has a first cavity that penetrates the limiting block along a first direction, and the bracket has a second cavity that penetrates the bracket along the first direction. Along the first direction, the inner cavity of the glue delivery tube, the first cavity, the inner cavity of the second permanent magnet, the receiving cavity, the inner cavity of the first permanent magnet, and the second cavity are sequentially connected.

[0019] Optionally, the limiting block is provided with an external thread, and the inner wall of the dispensing nozzle is provided with an internal thread that matches the external thread, and both the external thread and the internal thread are tapered threads.

[0020] Optionally, it also includes a cylinder, the drive end of which is connected to the glue delivery tube. The cylinder is used to drive the glue applicator to move along its axial direction to approach and move away from the cigarette packaging.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The embodiments of the present invention employ a ball bearing within the glue outlet of the glue applicator nozzle. A second permanent magnet applies a repulsive force to the first permanent magnet, thereby pushing the ball bearing against the glue outlet. When glue application is stopped, the ball bearing blocks the glue within the nozzle, preventing leakage from the outlet. During glue application, the cigarette packaging presses the ball bearing inward, creating a gap between the ball bearing and the outlet, allowing the glue to exit. Compared to existing glue guns, this invention, by applying a continuous and stable pushing force to the ball bearing using both the first and second permanent magnets, prevents glue leakage when glue application is stopped and prevents excessive glue output during application, thus providing stable glue control. Attached Figure Description

[0023] Figure 1 A cross-sectional view of an adhesive applicator provided in an embodiment of the present invention is shown;

[0024] Figure 2 This diagram shows a structural view of an adhesive applicator provided in an embodiment of the present invention;

[0025] Figure 3 This diagram illustrates a structural view of a support provided in an embodiment of the present invention.

[0026] Figure label:

[0027] 1. Glue applicator nozzle, 2. Receiving cavity, 3. Glue outlet, 4. Ball bearing, 5. First permanent magnet, 6. Second permanent magnet, 7. Limiting block, 8. Bracket, 9. Base, 10. Claw, 11. Glue delivery tube, 12. First cavity, 13. Second cavity, 14. Cylinder, 15. Protrusion, 16. Groove, 17. Sealing gasket, 18. Drive end, 19. Input interface. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0029] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0031] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0032] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] In some embodiments of this application, the glue gun is prone to fatigue after prolonged operation. This fatigue can cause abnormal glue spraying from the glue gun's output end, leading to problems such as sticking inside the carton and contamination of the label paper. The applicant has discovered that the glue gun's applicator nozzle contains a spring and a ball bearing. The spring applies a pushing force to the ball bearing, causing it to cover the glue outlet of the applicator nozzle. However, the spring is susceptible to corrosion from moisture and acidic impurities in the glue. Furthermore, after prolonged operation, the spring is prone to mechanical fatigue, resulting in reduced elasticity or even breakage. Taking the GDX2 packaging machine as an example, under operating conditions of 38 pieces / minute and an average monthly production period of 24 days, the conical compression spring inside the glue gun will experience fatigue and breakage in approximately 3-6 months. The above two factors cause the ball bearing to fail to completely cover the glue outlet. When the glue application stops, the glue easily leaks out from the gap between the ball bearing and the glue outlet. During the glue application process, if the gap between the ball bearing and the glue outlet is too large, excessive glue will be applied to the cigarette packaging, resulting in serious packaging quality problems.

[0035] To address the aforementioned technical problems, embodiments of the present invention provide an adhesive application apparatus, such as... Figure 1 As shown, the adhesive application device includes an application nozzle 1, a ball bearing 4, a first permanent magnet 5, a second permanent magnet 6, and a limiting block 7. The application nozzle 1 has an internal receiving cavity 2 extending along a first direction. The application nozzle 1 extends along the first direction (e.g., ...). Figure 1 and Figure 2 The two ends of the nozzle (in the X direction) are the input end and the output end, respectively. The input end is connected to the glue supply system, and the output end has a glue outlet 3. A ball bearing 4 is located inside the receiving cavity 2 and can rotate around its own center. The diameter of the glue outlet 3 is smaller than the diameter of the ball bearing 4, and the ball bearing 4 partially protrudes beyond the glue outlet 3. A first permanent magnet 5 is located inside the receiving cavity 2, on the side of the ball bearing 4 furthest from the glue outlet 3. A second permanent magnet 6 is located inside the receiving cavity 2, on the side of the first permanent magnet 5 furthest from the glue outlet 3. The first permanent magnet 5 and the second permanent magnet 6 are arranged with their same poles facing each other. The second permanent magnet 6 is used to apply a pushing force towards the glue outlet 3 to the first permanent magnet 5 and the ball bearing 4. A limiting block 7 is located inside the receiving cavity 2, on the side of the second permanent magnet 6 furthest from the glue outlet 3. The limiting block 7 is threadedly connected to the inner wall of the glue applicator 1 and is used to limit the distance between the second permanent magnet 6 and the first permanent magnet 5.

[0036] The working principle of the adhesive application device provided in this application is as follows:

[0037] The adhesive in the adhesive supply system enters the receiving cavity 2 of the adhesive nozzle 1 through the input end of the nozzle 1. When the adhesive application process stops, the second permanent magnet 6 applies a repulsive force to the first permanent magnet 5, keeping the first permanent magnet 5 pressed against the ball bearing 4, causing the ball bearing 4 to block the outlet 3 and preventing the adhesive in the nozzle 1 from leaking out of the outlet 3. When the adhesive application process is in progress, the cigarette packaging passes through the output end of the nozzle 1, and the nozzle 1 moves towards the cigarette packaging under the action of external force, causing the ball bearing 4 to press against the surface of the cigarette packaging. The side of the cigarette packaging away from the ball bearing 4 is provided with a back plate, which supports the cigarette packaging and presses the ball bearing 4 into the interior of the nozzle 1. Subsequently, the ball bearing 4 moves into the interior of the nozzle 1 under the pressure of the back plate and the cigarette packaging, creating a gap between the ball bearing 4 and the outlet 3, through which the adhesive is output to the surface of the cigarette packaging. When the cigarette packaging moves relative to the ball bearing 4, the ball bearing 4 rolls along the surface of the cigarette packaging, evenly applying the adhesive to the surface of the cigarette packaging.

[0038] By employing the above technical solution, a ball bearing 4 is installed inside the glue outlet 3 of the glue applicator 1, and a repulsive force is applied to the first permanent magnet 5 by the second permanent magnet 6, thereby applying a pushing force to the ball bearing 4 so that it covers the glue outlet 3. When the glue application process stops, the ball bearing 4 prevents the glue in the glue applicator 1 from leaking out of the glue outlet 3. During the glue application process, the cigarette packaging squeezes the ball bearing 4 inward, creating a gap between the ball bearing 4 and the glue outlet 3, allowing the glue to be output from the gap. Compared to existing glue guns, in this application, the repulsive force between the first permanent magnet 5 and the second permanent magnet 6 acts on the ball bearing 4, applying a continuous and stable pushing force to the ball bearing 4. This prevents the glue from leaking out of the glue outlet 3 when the glue application process stops and prevents excessive glue output during the glue application process, thus stably controlling the glue output. This avoids the problems of glue leakage and over-applying caused by the decrease or breakage of the spring force inside the glue gun in the prior art.

[0039] Furthermore, such as Figure 1 and Figure 3 As shown, a bracket 8 is provided between the first permanent magnet 5 and the ball 4. The bracket 8 is used to limit the radial position of the ball 4 along the glue outlet 3 so that the ball 4 is located in the middle of the glue outlet 3. Specifically, the bracket 8 includes an annular base 9, which is connected to the first permanent magnet 5. The end face of the base 9 facing the glue outlet 3 is provided with multiple claws 10, which are evenly distributed around the circumference of the base 9. The ball 4 is located between the claws 10 and contacts each claw 10. The connection between the first permanent magnet 5 and the base 9 can be by bonding, welding, or snap-fitting. In this embodiment, the end face of the base 9 facing the first permanent magnet 5 is provided with a groove 16, and the end face of the first permanent magnet 5 facing the base 9 is provided with a protrusion 15. The protrusion 15 is inserted into the groove 16, and the protrusion 15 and the groove 16 are press-fitted to prevent the first permanent magnet 5 and the base 9 from separating. In addition, the outer diameter of the base 9 is slightly larger than the outer diameter of the first permanent magnet 5, so as to limit the distance between the outer circumferential surface of the first permanent magnet 5 and the inner wall of the receiving cavity 2, and prevent the inner wall of the receiving cavity 2 from rubbing against the first permanent magnet 5, causing wear of the first permanent magnet 5 and a decrease in magnetization intensity.

[0040] Furthermore, both the first permanent magnet 5 and the second permanent magnet 6 are neodymium iron boron permanent magnets. Neodymium iron boron permanent magnets are characterized by strong magnetism, corrosion resistance, high plasticity, and low density, enabling them to provide a large magnetic force within the narrow space of the accommodating cavity 2. This allows the second permanent magnet 6 to provide a large repulsive force to the first permanent magnet 5.

[0041] Furthermore, the distance between the second permanent magnet 6 and the first permanent magnet 5 satisfies a functional relationship:

[0042] L = μSM 2 / α

[0043] Where L is the distance between the first permanent magnet 5 and the second permanent magnet 6, in mm; α is a correction coefficient, in N / m. For example, the correction coefficient α can be 379 × 10⁻⁶. -13 N / m; μ is the permeability of free space, for example, the permeability of free space μ can be 4π×10⁻⁶. -7 N / A 2 S represents the magnetic pole area between the first permanent magnet 5 and the second permanent magnet 6, that is, the overlapping area of ​​the opposite end faces of the first permanent magnet 5 and the second permanent magnet 6 projected along the first direction, in meters. 2 M represents the magnetization intensity of the neodymium iron boron permanent magnet, measured in A / m. For example, the magnetization intensity M can be 1.2–1.6 A / m, and its magnitude is significantly affected by the manufacturing process. In this embodiment, the magnetic pole area is 12π × 10⁻⁶. -6 m 2 The distance between the second permanent magnet 6 and the first permanent magnet 5 is 1.5–2 mm. When the magnetization of both the first permanent magnet 5 and the second permanent magnet 6 is 1.2 A / m, the distance L between them is set to 1.5 mm. At this time, the pressure of the ball bearing 4 on the glue outlet 3 is approximately 2.36 N, which meets the glue application design requirements. When the magnetization of both the first permanent magnet 5 and the second permanent magnet 6 is 1.6 A / m, the distance between them should be set to 2 mm. At this time, the pressure of the ball bearing 4 on the glue outlet 3 is approximately 2.37 N, which also meets the glue application design requirements. When the magnetization of either the first permanent magnet 5 or the second permanent magnet 6 is between 1.2 A / m and 1.6 A / m, the distance L should be set between 1.5 and 2 mm so that the pressure of the ball bearing 4 on the glue outlet 3 meets the glue application design requirements. It is worth mentioning that the size of the distance L between the first permanent magnet 5 and the second permanent magnet 6 can be adjusted by tightening and loosening the thread of the limiting block 7. When the limiting block 7 moves to its limit position, a shim can be added between the limiting block 7 and the second permanent magnet 6 to adjust the size of the gap L between the first permanent magnet 5 and the second permanent magnet 6.

[0044] Furthermore, both the first permanent magnet 5 and the second permanent magnet 6 are magnetic rings, and their outer diameters are equal. Both the first permanent magnet 5 and the second permanent magnet 6 have inner cavities, and the diameters of their inner cavities are equal, allowing the adhesive in the receiving cavity 2 to flow through the inner cavities of the first permanent magnet 5 and the second permanent magnet 6 to the adhesive outlet 3.

[0045] Furthermore, such as Figure 2 As shown, it also includes a glue delivery tube 11, with an input interface 19 on its outer circumference. The input interface 19 is connected to the glue supply system, and the output end of the glue delivery tube 11 is connected to the input end of the glue applicator 1. Specifically, as shown... Figure 1As shown, the limiting block 7 and the glue delivery tube 11 are integrally formed. When the limiting block 7 is threadedly connected to the glue applicator 1, the glue delivery tube 11 is connected to the glue applicator 1. The limiting block 7 has a first cavity 12 that extends through the limiting block 7 in a first direction, and the bracket 8 has a second cavity 13 that extends through the bracket 8 in a first direction. In the first direction, the inner cavity of the glue delivery tube 11, the first cavity 12, the inner cavity of the second permanent magnet 6, the receiving cavity 2, the inner cavity of the first permanent magnet 5, and the second cavity 13 are sequentially connected to each other, so that the glue can flow from the glue delivery tube 11 into the glue outlet 3.

[0046] Furthermore, such as Figure 1 As shown, the limiting block 7 has an external thread, and the inner wall of the dispensing nozzle 1 has an internal thread that matches the external thread. Both the external and internal threads are tapered threads. Using a tapered thread to connect the limiting block 7 and the dispensing nozzle 1 ensures a tight connection and improves sealing. To prevent a loose seal between the limiting block 7 and the dispensing nozzle 1, embodiments of this application may also include a sealing gasket 17 between the dispensing tube 11 and the dispensing nozzle 1. When the limiting block 7 and the dispensing nozzle 1 are threadedly connected, the sealing gasket 17 is compressed, achieving a sealing effect.

[0047] Furthermore, such as Figure 2 As shown, the device also includes a cylinder 14, the drive end 18 of which is connected to the glue-feeding tube 11. The cylinder 14 is used to drive the glue-feeding tube 11 and the glue-applying nozzle 1 to move along their axial direction (i.e., the first direction) to approach and move away from the cigarette packaging. When applying glue, the cylinder 14 drives the glue-feeding tube 11 and the glue-applying nozzle 1 to approach the cigarette packaging along the first direction to apply glue to the cigarette packaging; when the glue-feeding operation is stopped, the cylinder 14 drives the glue-feeding tube 11 and the glue-applying nozzle 1 away from the cigarette packaging to stop the output of glue.

[0048] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A glue-applying device, characterized in that, include: The glue applicator has an internal receiving cavity extending in a first direction. The two ends of the glue applicator in the first direction are an input end and an output end, respectively. The input end is connected to the glue supply system, and the output end is provided with a glue outlet. A ball bearing is disposed within the receiving cavity and is capable of rotating around its own center. The diameter of the glue outlet is smaller than the diameter of the ball bearing, and the ball bearing partially protrudes beyond the glue outlet. A first permanent magnet is disposed in the receiving cavity and located on the side of the ball away from the glue outlet; The second permanent magnet is disposed in the receiving cavity and located on the side of the first permanent magnet away from the glue outlet. The first permanent magnet and the second permanent magnet are arranged with the same pole facing each other. The second permanent magnet is used to apply a thrust toward the glue outlet to the first permanent magnet and the ball. A limiting block is disposed within the receiving cavity and located on the side of the second permanent magnet away from the glue outlet. The limiting block is threadedly connected to the inner wall of the glue applicator and is used to limit the distance between the second permanent magnet and the first permanent magnet.

2. The adhesive applicator as described in claim 1, characterized in that, A bracket is provided between the first permanent magnet and the ball, the bracket being used to define the radial position of the ball along the glue outlet so that the ball is located in the middle of the glue outlet.

3. The adhesive applicator as described in claim 2, characterized in that, The bracket includes an annular base connected to the first permanent magnet. The end face of the base facing the dispensing port is provided with multiple claws, which are evenly distributed along the circumference of the base. The ball bearing is located between the claws and contacts each claw.

4. The adhesive applicator as described in claim 3, characterized in that, Both the first permanent magnet and the second permanent magnet are neodymium iron boron permanent magnets.

5. The adhesive applicator as described in claim 4, characterized in that, The distance between the second permanent magnet and the first permanent magnet satisfies a functional relationship: L=μSM 2 / a Where L is the distance between the first permanent magnet and the second permanent magnet, in mm; α is the correction coefficient, in N / m; and μ is the free permeability, in N / A. 2 S represents the magnetic pole area between the first permanent magnet and the second permanent magnet, in meters. 2 The magnetization intensity of the neodymium iron boron permanent magnet described in M ​​is expressed in A / m.

6. The adhesive applicator as described in claim 5, characterized in that, The distance between the second permanent magnet and the first permanent magnet is 1.5 to 2 mm.

7. The adhesive applicator as described in claim 6, characterized in that, Both the first permanent magnet and the second permanent magnet are magnetic rings, and the outer diameters of the first permanent magnet and the second permanent magnet are equal.

8. The adhesive applicator as described in claim 7, characterized in that, It also includes a glue delivery tube, the input end of which is connected to the glue supply system, and the output end of which is connected to the input end of the glue applicator. The limiting block has a first cavity that penetrates the limiting block along the first direction, and the bracket has a second cavity that penetrates the bracket along the first direction. Along the first direction, the inner cavity of the glue delivery tube, the first cavity, the inner cavity of the second permanent magnet, the receiving cavity, the inner cavity of the first permanent magnet, and the second cavity are sequentially connected.

9. The adhesive applicator as described in claim 8, characterized in that, The limiting block is provided with an external thread, and the inner wall of the glue applicator is provided with an internal thread that matches the external thread, and both the external thread and the internal thread are tapered threads.

10. The adhesive applicator as claimed in claim 9, characterized in that, It also includes a cylinder, the drive end of which is connected to the glue delivery tube. The cylinder is used to drive the glue applicator to move along its axial direction to approach and move away from the cigarette packaging.

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