Gun head of hot melt glue gun

Abstract

The utility model relates to the field of gluing guns, and discloses a gun head of a hot melt glue gun, which comprises a gluing part, the gluing part is provided with a glue outlet channel and further provided with a gluing face used for being attached to a to-be-glued face of a product, a glue outlet groove is formed in the gluing face of the gluing part, one end of the glue outlet groove is communicated with the glue outlet channel, the other end of the glue outlet groove extends out of the gluing part in the first direction, and the distance between the bottom face of the glue outlet groove and the gluing face is gradually increased in the second direction. The first direction is perpendicular to the second direction. The gun head of the hot melt glue gun provided by the utility model can solve the problem of how to improve the gluing uniformity of a step-shaped surface to be glued.

Description

Technical Field

[0001] The utility model relates to the field of glue guns, in particular to a gun head of a hot melt glue gun. Background Art

[0002] In the packaging and logistics industry, folding boxes are widely used for transporting and storing a wide variety of goods as an economical, environmentally friendly, and easy-to-use packaging method. Traditionally, double-sided tape has been used as the adhesive material in the production of folding boxes. However, double-sided tape suffers from drawbacks such as weak adhesion and a significant decrease in adhesion at low temperatures, making it difficult to ensure the structural stability of the folding boxes. To overcome these drawbacks, the industry has begun to seek more advanced and reliable adhesive solutions. Hot melt adhesive, with its excellent adhesion, fast curing properties, and good temperature adaptability, has become an ideal alternative to double-sided tape.

[0003] Currently, the industry generally uses cylindrical gluing gun tips for applying thin, flat hot melt adhesives. One end of the cylindrical gluing gun tip has a gluing surface with multiple gluing holes. During gluing, the gluing holes release glue while the gluing surface adheres to the product surface, creating a flat surface. However, cylindrical gluing gun tips are more suitable for applying flat surfaces, but their limitations become apparent when applying to the edges of folding boxes.

[0004] Specifically, because the edges of folding boxes often need to be wrapped with additional cardboard to beautify their appearance, the surface to be glued at the edges of the folding box boards presents an uneven step-like structure. The edges of the folding box boards are easily warped and deformed due to the material properties, exacerbating the step-like structure of the surface to be glued. This uneven shape of the surface to be glued causes the gap between the glue outlet and the surface to be glued to vary in size when the gluing surface of the cylindrical gluing gun head is close to the gluing surface to be glued. As a result, the glue is easily affected by the shape of the gap after flowing out of the glue outlet and flows to the area with less resistance (i.e., the side without the edge wrapped), resulting in glue concentration, uneven glue thickness, and even glue overflow, affecting the quality of the finished product and production efficiency of the folding box.

[0005] Therefore, it is particularly important to develop a gun head for a hot melt glue gun that can adapt to the stepped surface to be glued and evenly apply hot melt glue. Utility Model Content

[0006] (1) Technical problems solved

[0007] The utility model provides a gun head of a hot melt glue gun, which can at least solve the technical problem of how to improve the glue coating uniformity of a step-shaped surface to be glued.

[0008] (2) Technical solution

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: a gun head for a hot melt glue gun, comprising:

[0010] The gluing part is provided with a glue outlet channel, and the gluing part is also provided with a glue coating surface for bonding with the surface of the product to be glued. A glue outlet groove is provided on the gluing surface of the gluing part, one end of the glue outlet groove is connected with the glue outlet channel, and the other end extends to the outside of the gluing part along the first direction. The distance between the bottom surface of the glue outlet groove and the glue coating surface gradually increases along the second direction, and the first direction and the second direction are arranged perpendicularly.

[0011] It is further provided that the bottom surface of the aforementioned glue outlet groove is inclined along the second direction;

[0012] When the gun head of the hot melt glue gun moves forward in the opposite direction of the first direction to apply glue, the shallower end of the glue outlet groove is located on the unwrapped side of the surface to be glued, and the deeper end is located on the wrapped side of the surface to be glued.

[0013] It is further provided that the aforementioned glue coating portion is provided with recesses on both sides of the second direction so that the cross-sectional area of the glue coating portion is gradually reduced toward the glue coating surface along a direction perpendicular to the glue coating surface.

[0014] It is further provided that a plurality of wire grooves are provided on the gluing surface of the gluing portion.

[0015] It is further provided that the gun head of the aforementioned hot melt glue gun also includes a connecting portion, which is integrally connected to the end of the glue coating portion away from the glue coating surface, and is provided with a connecting hole connected to the glue outlet channel, and the connecting hole is used for detachable connection and pipeline connection to the main body of the hot melt glue gun.

[0016] It is further provided that one end of the aforementioned glue outlet channel is communicated with the glue outlet groove, and the other end passes through the connecting portion along the axis of the connecting hole and is communicated with the connecting hole.

[0017] It is further provided that the cross sections of the aforementioned glue outlet channel and glue outlet groove are both rectangular, and the glue outlet channel and glue outlet groove have the same size in the second direction.

[0018] It is further provided that the gun head of the aforementioned hot melt glue gun is provided with two force-applying surfaces which are symmetrical with respect to the axis of the connecting hole.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, the hot melt glue gun head provided by the present invention has the following beneficial effects:

[0021] When applying glue with the gun head of the hot melt glue gun provided by the present invention, the glue applying surface of the gun head is fitted with the surface of the product to be glued, so that the shallower end of the glue outlet groove is located on the unwrapped side of the surface to be glued, and the deeper end is located on the wrapped side of the surface to be glued; then, the gun head moves in the opposite direction of the first direction to apply glue, and at the same time, the glue outlet channel discharges glue, and the hot melt glue flows through the glue outlet groove to the surface to be glued to form a flat colloid; during the glue discharging process, the gun head limits the width of the glue discharge by the groove walls on the left and right sides of the glue outlet groove, and limits the thickness of the glue by the depth of the glue outlet groove. Since the gap between the bottom surface of the glue outlet groove and the stepped surface to be glued is the same size, the glue thickness is more uniform, and a more uniform coating effect is achieved. It can be seen that the gun head of the hot melt glue gun is suitable for applying glue to the stepped surface to be glued, can effectively improve the uniformity of the glue application on the stepped surface to be glued, and solve the problem of uneven glue thickness when applying glue to the stepped surface to be glued. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of the gun head of the hot melt glue gun in the embodiment from a first perspective;

[0023] Figure 2 2. It is a cross-sectional view of the gun head of the hot melt glue gun and the surface of the product to be glued in the first direction in the embodiment;

[0024] Figure 3 2. It is a cross-sectional view of the gun head of the hot melt glue gun and the surface of the product to be glued in the second direction in the embodiment;

[0025] Figure 4 This is a stereoscopic image of the gun head of the hot melt glue gun in the embodiment from a second perspective.

[0026] Figure Number:

[0027] 1. Connecting part; 11. Connecting hole;

[0028] 2. Gluing part; 21. Glue outlet channel; 22. Gluing surface; 23. Glue outlet groove; 231. Bottom surface; 24. Concave portion;

[0029] 3. Force application surface;

[0030] 4. Surface to be glued; 41. Unedged side; 42. Edging side. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The utility model provides a gun head of a hot melt glue gun, which is used to solve the problem of how to improve the glue coating uniformity of a step-shaped surface 4 to be glued.

[0033] See Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1 This is a three-dimensional diagram of the gun head of the hot melt glue gun in the embodiment from the first perspective. Figure 2 This is a cross-sectional view of the gun head of the hot melt glue gun and the surface of the product to be glued in the first direction in the embodiment. Figure 3 1 is a cross-sectional view of the gun head of the hot melt glue gun and the surface of the product to be glued in the second direction in an embodiment. The gun head of the hot melt glue gun includes a glue coating part 2.

[0034] The gluing unit 2 has a glue discharge channel 21 for directing hot melt adhesive from the hot melt glue gun body to the gluing unit 2. The gluing unit 2 also has a gluing surface 22 for contact with the surface 4 of the product to be glued. A glue discharge groove 23 is defined on the gluing surface 22 of the gluing unit 2. One end of the glue discharge groove 23 is connected to the glue discharge channel 21, and the other end extends outside the gluing unit 2 along a first direction. The distance between the bottom surface 231 of the glue discharge groove 23 and the gluing surface 22 gradually increases along a second direction, with the first and second directions being perpendicular.

[0035] When applying glue with the gun head of the hot melt glue gun of the above technical solution, the glue application surface 22 of the gun head is placed in contact with the surface 4 to be glued of the product, so that the shallower end of the glue outlet groove 23 is located on the unwrapped side 41 of the surface 4 to be glued, and the deeper end is located on the wrapped side 42 of the surface 4 to be glued. Then, the gun head is moved in the opposite direction of the first direction ( Figure 2 The glue is applied in the direction of the arrow in the figure. At the same time, the glue outlet channel 21 discharges glue, and the hot melt glue flows through the glue outlet groove 23 to the surface to be coated 4 to form a flat colloid. During the glue discharging process, the gun head limits the width of the glue discharge by the left and right side walls of the glue outlet groove 23, and limits the thickness of the glue by the depth of the glue outlet groove 23. Since the gap between the bottom surface 231 of the glue outlet groove 23 and the stepped surface to be coated 4 is the same size, the glue thickness is more uniform, achieving a more uniform coating effect. It can be seen that the gun head of the hot melt glue gun is suitable for coating the stepped surface to be coated 4 with glue, and can effectively improve the uniformity of the glue coating on the stepped surface to be coated 4, and solve the problem of uneven glue thickness when the gun head of the existing hot melt glue gun is applied to the stepped surface to be coated 4.

[0036] See Figure 3As shown, in one embodiment of the glue outlet groove 23, the bottom surface 231 of the glue outlet groove 23 is inclined along the second direction. Specifically, when the hot melt glue gun tip advances in a direction opposite to the first direction to apply glue, the shallower end of the glue outlet groove 23 is located on the unbound side 41 of the surface 4 to be glued, and the deeper end of the glue outlet groove 23 is located on the bound side 42 of the surface 4 to be glued. In this way, when the hot melt glue gun tip applies glue, the gap between the bottom surface 231 of the glue outlet groove 23 and the unbound side 41 and the bound side 42 is the same, that is, the gap between the bottom surface 231 of the glue outlet groove 23 and the surface 4 to be glued is the same, thereby achieving a more uniform glue thickness and a more uniform coating effect.

[0037] See Figure 1 and Figure 2 As shown, in one embodiment of the gluing portion 2, the gluing portion 2 has recesses 24 on both sides in the second direction, so that the cross-sectional area of the gluing portion 2 gradually decreases toward the gluing surface 22 along a direction perpendicular to the gluing surface 22. In this way, the recesses 24 can effectively reduce the contact area between the gluing surface 22 and the surface to be glued 4, thereby effectively reducing the stringing phenomenon of the gun tip of the hot melt glue gun.

[0038] In one embodiment of the glue coating unit 2, a plurality of grooves (not shown) are further provided on the glue coating surface 22 of the glue coating unit 2. In this way, the plurality of grooves can effectively reduce the contact area between the glue coating surface 22 and the surface to be glued 4, thereby effectively reducing the stringing phenomenon of the gun tip of the hot melt glue gun.

[0039] The above two implementation methods of reducing the stringing of the adhesive coating portion 2 can be selected at will.

[0040] See Figure 2 and Figure 3 As shown, based on any of the above embodiments, the gun head of the hot melt glue gun further includes a connecting portion 1, which is integrally connected to the end of the glue coating portion 2 away from the glue coating surface 22. The connecting portion 1 has a connecting hole 11, which is connected to the glue outlet channel 21. The connecting hole 11 is used for detachable connection and pipe connection to the main body of the hot melt glue gun. In this way, the gun head can be detachably connected to the main body of the hot melt glue gun through the connecting hole 11 by plugging, screwing, or clamping, so as to facilitate the replacement and maintenance of the gun head. At the same time, the gun head can also achieve pipe connection between the gun head and the main body of the hot melt glue gun through the connecting hole 11, forming a complete hot melt glue transmission path for transmitting hot melt glue.

[0041] The connecting portion 1 and the gluing portion 2 can be integrally formed of high-temperature resistant and corrosion-resistant materials to cope with the high-temperature use environment of the hot melt adhesive and ensure the long-term stable use of the gun head.

[0042] See Figure 2 、 Figure 3 and Figure 4 As shown, Figure 4This is a perspective view of the gun head of the hot melt glue gun in the embodiment from a second perspective. Based on the connection hole 11 on the connection part 1, one end of the glue outlet channel 21 is connected to the glue outlet groove 23, and the other end passes through the connection part 1 along the axis of the connection hole 11 and is connected to the connection hole 11. In this way, the hot melt glue flowing from the hot melt glue gun body into the connection hole 11 can spread from the center to the sides and flow into the glue outlet channel 21, making the glue thickness more uniform and achieving a more uniform coating effect.

[0043] See Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the glue outlet channel 21 passes through the connecting portion 1, and the cross-sections of the glue outlet channel 21 and the glue outlet groove 23 are both rectangular, and the glue outlet channel 21 and the glue outlet groove 23 have the same size in the second direction. In this way, the glue outlet channel 21 can facilitate the uniform and stable flow of hot melt adhesive, further ensuring the uniformity of glue coating.

[0044] See Figure 1 、 Figure 2 and Figure 4 As shown, based on the connection hole 11 on the connection portion 1, the gun head of the hot melt glue gun has two force-applying surfaces 3, which are symmetrical with respect to the axis of the connection hole 11. In this way, the two force-applying surfaces 3 can facilitate the user to apply force to the gun head, so that the gun head can be plugged, screwed, or clamped to the hot melt glue gun body through the connection hole 11, thereby improving the convenience of the installation operation.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gun head for a hot melt glue gun, characterized in that: include: The gluing part is provided with a gluing channel, and the gluing part is also provided with a gluing surface for bonding with the surface of the product to be glued. A gluing groove is provided on the gluing surface of the gluing part, one end of the gluing groove is connected to the gluing channel, and the other end extends to the outside of the gluing part along the first direction. The distance between the bottom surface of the gluing groove and the gluing surface gradually increases along the second direction, and the first direction and the second direction are arranged perpendicularly.

2. The gun head of a hot melt glue gun according to claim 1, characterized in that: The bottom surface of the glue outlet groove is inclined along the second direction; When the gun head of the hot melt glue gun moves forward in the opposite direction of the first direction to apply glue, the shallower end of the glue outlet groove is located on the unwrapped side of the surface to be glued, and the deeper end is located on the wrapped side of the surface to be glued.

3. The gun head of a hot melt glue gun according to claim 2, characterized in that: The glue coating portion is provided with recesses on both sides of the second direction, so that the cross-sectional area of the glue coating portion is gradually reduced toward the glue coating surface along a direction perpendicular to the glue coating surface.

4. The gun head of a hot melt glue gun according to claim 2, characterized in that: The gluing surface of the gluing part is also provided with a plurality of line grooves.

5. A hot melt glue gun head according to any one of claims 1-4, characterized in that: The gun head of the hot melt glue gun also includes a connecting part, which is integrally connected to the end of the glue coating part away from the glue coating surface, and is provided with a connecting hole connected to the glue outlet channel. The connecting hole is used for detachable connection and pipeline connection to the main body of the hot melt glue gun.

6. The gun head of a hot melt glue gun according to claim 5, characterized in that: One end of the glue outlet channel is communicated with the glue outlet groove, and the other end thereof passes through the connecting portion along the axis of the connecting hole and is communicated with the connecting hole.

7. The gun head of a hot melt glue gun according to claim 6, characterized in that: The cross sections of the glue outlet channel and the glue outlet groove are both rectangular, and the glue outlet channel and the glue outlet groove have the same size in the second direction.

8. The gun head of a hot melt glue gun according to claim 5, characterized in that: The gun head of the hot melt glue gun is provided with two force-applying surfaces which are symmetrical with respect to the axis of the connecting hole.

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