Dispensing device

Abstract

The present invention discloses a dispensing needle assembly and a dispensing device, wherein the dispensing needle assembly can be installed on the dispensing device and includes: a first base, the first base is used to be installed on the dispensing device, and is provided with a through first glue pipeline, the first glue pipeline having a large diameter portion and a small diameter portion, the large diameter portion and the small diameter portion being connected; a needle tube, having a needle tube sliding portion, the needle tube sliding portion being partially accommodated in the small diameter portion, and the needle tube sliding portion being free to slide in the small diameter portion; a sealing portion being accommodated in the large diameter portion, and sealing the gap between the needle tube sliding portion and the small diameter portion after the needle tube sliding portion is accommodated in the small diameter portion; and a fastening portion being configured to fasten the needle tube to the first base. The dispensing needle assembly of the present invention, since the needle tube is freely slidably mounted on the first base and fastened to the first base by the fastening portion, is not only convenient for replacing the needle tube, but also convenient for correcting the installation height of the needle tube.

Description

Technical Field

[0001] The present invention relates to the technical field of glue dispensing, in particular to a glue dispensing device. Background Art

[0002] In glue dispensing machines, needles are consumables that require regular replacement. Furthermore, different specifications of needles are required depending on the dispensing profile. Existing dispensing machine needle assemblies come in a variety of styles, including those molded from plastic or stainless steel. Due to the varying sizes of these integrated needles, installation in the dispensing device can easily cause the needle to be positioned slightly above the product being dispensed. Consequently, the entire dispensing needle assembly often requires post-installation calibration. Summary of the Invention

[0003] In order to at least solve one of the problems in the known technology to a certain extent, the present invention proposes a dispensing needle assembly that can reduce the difficulty of correction after the dispensing needle assembly is installed in the dispensing device. In addition, the present invention also proposes a dispensing device using the dispensing needle assembly.

[0004] According to the first aspect of the present invention, the dispensing needle assembly can be installed in a dispensing device, including: a first base, the first base is used to be installed in the dispensing device, and is provided with a through first glue pipeline, the first glue pipeline has a large diameter portion and a small diameter portion, and the large diameter portion and the small diameter portion are connected; a needle tube, having a needle tube sliding portion, the needle tube sliding portion is partially accommodated in the small diameter portion, and the needle tube sliding portion slides freely in the small diameter portion; a sealing portion is accommodated in the large diameter portion, and after the needle tube sliding portion is accommodated in the small diameter portion, the gap between the needle tube sliding portion and the small diameter portion is sealed; a fastening portion is configured to fasten the needle tube to the first base.

[0005] The dispensing needle assembly according to this embodiment has at least the following beneficial effects: since the needle tube is slidably installed on the first base and is fastened to the first base by the fastening part, not only can the needle tube be easily replaced, but the installation height of the needle tube can also be easily corrected.

[0006] In some embodiments, the cross-sectional shape of the inner tube of the needle tube is circular, elliptical, D-shaped, triangular or square.

[0007] In some embodiments, the sealing portion includes a sealing ring, and the sealing ring is embedded on the outer circumference of the needle tube.

[0008] In some embodiments, the sealing portion further includes a compression ring, one axial end of the compression ring abuts against and presses the sealing ring so that the sealing ring sticks to the outer circumference of the needle tube.

[0009] In some embodiments, the first base is provided with a first threaded hole penetrating through its side wall, and the first threaded hole is connected to the small diameter portion; the fastening portion includes a first threaded member, and the first threaded member is threadedly connected to the first threaded hole and tightens the needle tube.

[0010] In some embodiments, a first groove is formed on the tube wall portion of the glue-discharging end of the needle tube, and the first groove penetrates the tube wall portion along the radial direction of the needle tube.

[0011] According to an embodiment of the second aspect of the present invention, the dispensing device includes: a first driving part, which drives linearly along the X-axis direction; a second base, which is installed on the first driving part and is driven by the first driving part to move linearly; a dispensing needle assembly of any of the above items, which is installed on the second base through the first base; and a glue storage part, which is connected to the first glue pipeline.

[0012] The dispensing device according to this embodiment has at least the following beneficial effects: since the needle tube of the dispensing needle assembly is slidably installed on the first base and fastened to the first base through the fastening part, the dispensing device of this embodiment can not only conveniently replace the needle tube, but also conveniently correct the installation height of the needle tube.

[0013] In some embodiments, the device further includes: a second driving unit for linear driving along the Y-axis direction, and the first driving unit is mounted to the second driving unit.

[0014] In some embodiments, a rotation drive unit is further included, which is mounted on the second base and is configured to drive the dispensing needle assembly to rotate.

[0015] In some embodiments, the device further comprises a shaft-shaped rotating member, the rotating member being mounted on the second base and being rotated by the rotating driving unit, the rotating member being provided with a second glue pipeline running through the axial direction thereof;

[0016] The first base is mounted on the rotating member, and the first glue pipeline is communicated with the glue storage portion through the second glue pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic diagram of an embodiment of a dispensing needle assembly according to the first aspect of the present invention.

[0018] Figure 2 yes Figure 1 Cross-sectional view at AA in.

[0019] Figure 3 It is a front view of another embodiment of the dispensing needle assembly of the first aspect embodiment of the present invention.

[0020] Figure 4 yes Figure 3 Cross-sectional view at BB in.

[0021] Figure 5 yes Figure 3 The cross-sectional view at CC in FIG. 1 is a schematic diagram showing that the inner tube of the needle tube is triangular in shape.

[0022] Figure 6 yes Figure 3 The cross-sectional view at CC in FIG. 1 is a schematic diagram showing that the inner tube of the needle tube is in a D shape.

[0023] Figure 7 It is a stereoscopic diagram of an embodiment of a dispensing device according to the second aspect of the present invention.

[0024] Figure 8 yes Figure 7 A side view of the dispensing device in FIG. Figure 7 Partial cross-sectional view at EE in FIG.

[0025] Figure 9 yes Figure 8 A partial enlarged view of point F in FIG. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the present invention can be implemented in many different ways and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to enable those skilled in the art to have a more thorough and comprehensive understanding of the contents disclosed in the present invention.

[0027] In the description of the embodiments of the present invention, if orientation descriptions are involved, the orientations or positional relationships indicated by "up", "down", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the accompanying drawings. 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0028] In the description of the embodiments of the present invention, if a certain feature is referred to as being "set", "fixed", "connected" or "installed" on another feature, it may be directly set, fixed or connected on the other feature, or it may be indirectly set, fixed, connected or installed on the other feature. In the description of the embodiments of the present invention, if "several" is involved, it means more than one; if "multiple" is involved, it means more than two; if "greater than", "less than" or "exceeds" is involved, it should be understood as not including the number itself; if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In addition, for the sake of convenience, the same or similar technical features in each embodiment are given the same figure marks and are distinguished only when necessary.

[0030] Figure 1 is a perspective view of an embodiment of a dispensing needle assembly 100. Figure 2 yes Figure 1 The cross-sectional view at AA in the figure is as follows: Figure 3 is a front view of another embodiment of the dispensing needle assembly 100, Figure 4 yes Figure 3 The cross-sectional view at BB in Figures 1 to 4 According to the first embodiment of the present invention, the dispensing needle assembly 100 can be installed in the dispensing device 200, including: a first base 101, a needle tube 102, a sealing portion 103 and a fastening portion 104 ( Figure 1 Not shown), wherein the first base 101 is used to be installed to the dispensing device 200, and the first base 101 is provided with a through first glue pipeline 105, and the first glue pipeline 105 has a large diameter portion 106 and a small diameter portion 107, and the large diameter portion 106 and the small diameter portion 107 are connected; the needle tube 102 has a needle tube sliding portion 108, and the needle tube sliding portion 108 is partially accommodated in the small diameter portion 107, and the needle tube sliding portion 108 is free to slide in the small diameter portion 107; the sealing portion 103 is accommodated in the large diameter portion 106, and after the needle tube sliding portion 108 is accommodated in the small diameter portion 107, the gap between the needle tube sliding portion 108 and the small diameter portion 107 is sealed; the fastening portion 104 is configured to fasten the needle tube 102 to the first base 101.

[0031] In this embodiment, since the needle tube 102 is slidably mounted to the first base 101 and fastened to the first base 101 by the fastening portion 104, not only can the needle tube 102 be easily replaced, but the installation height of the needle tube 102 can also be easily corrected.

[0032] In addition, since a sealing portion 103 is provided to seal the gap between the needle tube sliding portion 108 and the small diameter portion 107 , it is possible to prevent glue from leaking between the large diameter portion 106 and the small diameter portion 107 , ensuring that the glue at the large diameter portion 106 is injected through the needle tube 102 .

[0033] It is conceivable that the shape of the first base 101 is not particularly limited, and may be, for example, an axis or a block. In addition, the axis may be in various shapes such as a chamfered axis or a stepped axis.

[0034] It can be imagined that as long as the first base 101 can be installed on the dispensing device 200 and the first glue pipeline 105 is connected to the glue storage part 203 of the dispensing device 200, such as a glue cylinder, its installation form is not particularly limited. For example, it can be installed on the dispensing device 200 by threaded locking.

[0035] It can be imagined that "large diameter" and "small diameter" only describe the relative size relationship between the two, that is, the radial dimension of the large diameter portion 106 is larger than the dimension of the small diameter portion 107, but does not limit their specific dimensions. In addition, although "diameter" is used for explanation here, "diameter" should be understood in a broad sense. "Diameter" only refers to the cross-sectional direction of the first glue pipeline 105, and does not limit the shape of the cross-section. For example, the cross-sectional shape of the small diameter portion 107 can be various shapes such as circular, elliptical, D-shaped, triangular, square, etc. Furthermore, the needle tube sliding portion 108 is set according to the shape of the cross section of the small diameter portion 107 so as to adapt to the small diameter portion 107 and slide freely within the small diameter portion 107.

[0036] It is conceivable that the shape and direction of the first glue line 105 are not particularly limited as long as it passes through the first base 101. For example, the first glue line 105 can pass through the first base 101 along the axial direction. In addition, although the term "axis" is used in this specification, "axis" should be understood in a broad sense and does not limit the shape of the first glue line 105 or the first base 101.

[0037] Figure 5 yes Figure 3 The cross-sectional view at CC in FIG. 1 is a schematic diagram showing that the inner tube 109 of the needle tube 102 is triangular in shape. Figure 6 yes Figure 3 The cross-sectional view at CC in FIG. 1 is a schematic diagram showing that the inner tube 109 of the needle tube 102 is in a D-shape. Figure 5 、 Figure 6In some embodiments, since different products require different glue-covered contours, the glue needs to be stretched into different contours after being dispensed onto the product. In order to improve the aesthetics of the contours of these glues, the cross-sectional shape of the inner tube 109 of the needle tube 102 can be circular ( Figure 2 ), oval, triangular ( Figure 5 )、D shape( Figure 6 Specifically, when the glue needs to be in a shape such as a circle, an ellipse, a D-shape, a triangle or a square, by pre-setting the cross-sectional shape of the inner tube 109 of the needle tube 102 to a matching shape, it is ensured that the glue is formed before reaching the product, thereby improving the stability of the glue and avoiding the problem of excess glue when the glue is drawn into a specific glue contour.

[0038] In addition, it should be noted that although the cross-sectional shape of the inner tube 109 of the needle tube 102 is set according to the contour shape covered by the glue, the shape of the outer periphery of the needle tube 102 is not particularly limited. It can be set to a shape that is roughly compatible with the cross-sectional shape of the inner tube 109, such as a circular shape, an elliptical shape, a D-shape, a triangular shape or a square shape, etc., or it can be uniformly set to a circular shape or a square shape, and the corresponding cross-sectional shape of the inner tube 109 is set only according to the shape of the contour covered by the glue.

[0039] In addition, as long as the needle tube 102 can stably discharge glue, its extended shape is not limited. For example, the needle tube 102 can be a straight tube.

[0040] Continue to refer to Figure 2 、 Figure 4 In some embodiments, to ensure that the sealing portion 103 tightly seals the gap between the needle tube sliding portion 108 and the small-diameter portion 107, the sealing portion 103 includes a sealing ring 110 that is fitted around the outer circumference of the needle tube 102. Specifically, the sealing ring 110 can be, for example, an O-ring. The material of the sealing ring 110 is not particularly limited as long as it is resistant to corrosion from glue, and can be, for example, a rubber sealing ring.

[0041] In some embodiments, in order to ensure that the sealing ring 110 is reliably fitted on the outer circumference of the needle tube 102, and in particular, to ensure that the sealing ring 110 is reliably fitted on a needle tube sliding portion 108 having a non-circular shape, such as an elliptical shape, a D-shape, a triangular shape, or a square shape, the sealing portion 103 further includes a clamping ring 111. One axial end of the clamping ring 111 abuts against and presses the sealing ring 110, so that the sealing ring 110 is attached to the outer circumference of the needle tube 102. Specifically, when the clamping ring 111 is pressed, the sealing ring 110 is pressed and deformed in a manner that adapts to the shape of the outer circumference of the needle tube sliding portion 108, thereby being able to tightly fit on needle tube sliding portions 108 of various non-circular shapes. Furthermore, in order to deform the sealing ring 110 toward the middle (i.e., toward the needle tube sliding portion 108), the clamping ring 111 is provided with a first inclined surface 112 inclined toward its radial inner side. The clamping ring 111 presses the sealing ring 110 through the first inclined surface 112, thereby deforming the sealing ring 110 toward the middle.

[0042] It should be noted that the manner in which the compression ring 111 compresses the sealing ring 110 is not particularly limited. For example, the compression ring 111 can be locked to the large-diameter portion 106 of the first base 101 by a locking method, thereby compressing the sealing ring 110. In addition, the compression ring 111 can also be configured to be pressed after the dispensing needle assembly 100 is installed in the dispensing device 200, thereby compressing the sealing ring 110.

[0043] In addition, the inner ring 113 of the clamping ring 111 can also be configured to match the outer shape of the needle tube sliding portion 108, thereby further making the sliding of the needle tube 102 smoother and conveniently correcting the installation height of the needle tube 102.

[0044] In some embodiments, to facilitate assembly and disassembly of the needle tube 102, the first base 101 is provided with a first threaded hole 114 extending through its sidewall. The first threaded hole 114 communicates with the small-diameter portion 107. The fastening portion 104 includes a first threaded member 115, which is threadedly coupled to the first threaded hole 114 and securely holds the needle tube 102 in place. Specifically, the first threaded member 115 can be, for example, a set screw. Furthermore, when the needle tube sliding portion 108 has a triangular or D-shaped shape, for example, the first threaded hole 114 is positioned opposite the flat surface 116 of the needle tube 102. The first threaded member 115 secures the needle tube 102 against a second inclined surface 117 (triangular, useful for positioning) or a curved surface 118 (D-shaped, useful for positioning), which is inclined relative to the flat surface 116 of the needle tube 102. This not only facilitates the securement of the needle tube 102 but also improves the installation accuracy and concentricity of the needle tube 102.

[0045] Continue to refer to Figure 1 、 Figure 2In some embodiments, in order to further improve the accuracy (aesthetics) of the outline covered by the glue, especially to improve the accuracy of the outline covered by the glue (for example, when the outline of the glue is annular or curved), ensure that the outline of the glue coverage at the bend is consistent with the outline of other locations covered by the glue, and reduce the difficulty of dispensing glue at the bend, a first groove 120 is formed on the tube wall 119 at the glue outlet end of the needle tube 102. The first groove 120 penetrates the tube wall 119 along the radial direction of the needle tube 102. Specifically, the first groove 120 can be, for example, V-shaped or U-shaped, and penetrates the tube wall 119 from the approximately middle portion of the radial direction of the needle tube 102. In this way, the shape of the glue outline at the bend can be roughly consistent with the shape of other locations, thereby improving the accuracy of the glue coverage outline. In addition, the glue outline can be made to have a cross-section that gradually decreases from the surface of the product toward the direction away from the product.

[0046] Continue to refer to Figure 4 In addition, the shape of the first groove 120 is not limited to this. The first groove 120 can also penetrate the tube wall portion 119 of the needle tube 102 along the radial direction of the needle tube 102 at an angle greater than 0° and less than 90° to the radial direction of the needle tube 102. In this case, when observed from the side of the needle tube 102, the end of the needle tube 102 for discharging glue is inclined relative to the axial direction of the needle tube 102.

[0047] Figure 7 is a perspective view of an embodiment of a dispensing device 200. Figure 8 is a side view of the dispensing device 200, showing Figure 7 The partial cross-sectional view at EE in the figure, Figure 9 yes Figure 8 A partial enlarged view of point F in FIG. Figures 7 to 9 As described above, the dispensing needle assembly 100 can be applied to the dispensing device 200. Specifically, the dispensing device 200 according to the second aspect of the present invention includes: a first driving unit 201, a second base 202, a dispensing needle assembly 100 and a glue storage unit 203, wherein the first driving unit 201 is driven linearly along the X-axis direction; the second base 202 is installed on the first driving unit 201 and is driven by the first driving unit 201 to move linearly; the dispensing needle assembly 100 is installed on the second base 202 through the first base 101; the glue storage unit 203 is connected to the first glue pipeline 105.

[0048] In this embodiment, since the needle tube 102 of the dispensing needle assembly 100 is slidably installed on the first base 101 and is fastened to the first base 101 through the fastening part 104, the dispensing device 200 of this embodiment can not only easily replace the needle tube 102, but also easily correct the installation height of the needle tube 102.

[0049] It is conceivable that the first drive unit 201 is not particularly limited in type as long as it can drive the dispensing needle assembly 100 in a linear direction. For example, it can be a single-axis manipulator (i.e., an electric slide module) driven by a motor, including a slide rail and a slider (not shown) as a linear guide, and a screw assembly (not shown) as a transmission member. The second base 202 is mounted on the slider of the first drive unit 201 and connected to the screw assembly, thereby being driven by the first drive unit 201 to move linearly.

[0050] It can be imagined that the dispensing needle assembly 100 is not particularly limited as long as it can be installed on the second base 202 and can be driven by the first driving part 201 to dispense glue to the product. Preferably, after the dispensing needle assembly 100 is installed on the second base 202, the needle tube 102 discharges glue in the Z-axis direction.

[0051] It is conceivable that the glue storage portion 203 may include containers such as glue cylinders, glue barrels, etc. for storing glue. In addition, the glue storage portion 203 may be directly mounted on the second base 202 or mounted on a workbench (not shown) of another location such as a glue dispenser.

[0052] In some embodiments, in order to enable the dispensing device 200 to dispense glue in multiple directions, it also includes: a second drive unit 204, the second drive unit 204 is linearly driven along the Y-axis direction, and the first drive unit 201 is installed to the second drive unit 204. Specifically, the second drive unit 204 can also select the same drive element as the first drive unit 201, such as a single-axis manipulator with a motor as the driving power. By installing the first drive unit 201 to the second drive unit 204, it is equipped with a dual-axis manipulator (driven along the X-axis direction and the Y-axis direction). By providing the first drive unit 201 and the second drive unit 204, dispensing of, for example, a circular or curved trajectory can be easily performed.

[0053] In some embodiments, in order to ensure that the contour covered by the glue is consistent, especially when dispensing glue in a circular or curved path, a rotation drive unit 205 is further included. The rotation drive unit 205 is mounted on the second base 202 and is configured to drive the dispensing needle assembly 100 to rotate. Specifically, the inner tube 109 of the needle tube 102 has a circular cross-section, and the end of the needle tube 102 for dispensing glue has a first groove 120 extending through the tube wall 119 of the needle tube 102 from the radially approximately middle portion thereof. In this embodiment, for example, in the initial state, the first groove portion 120 faces the X-axis direction. When the first driving unit 201 drives the needle tube 102 to move along the X-axis direction, a uniform glue profile with a cross-section gradually decreasing along the Z-axis direction can be formed on the product along the X-axis direction. When the second driving unit 204 continues to drive the needle tube 102 to move along the Y-axis direction, by providing a rotating driving unit 205, the needle tube 102 rotates while moving along the Y-axis direction so that the first groove portion 120 faces the Y-axis direction, and a circular arc transition can be formed at the intersection (bend) of the glue profile extending along the X-axis direction and along the Y-axis direction. In addition, by providing the first groove portion 120, it is also possible to achieve that the glue-covered profile formed at the intersection extending along the X-axis direction and along the Y-axis direction also has a cross-section gradually decreasing along the Z-axis direction. As a result, the shape of the glue profile at the bend can be roughly consistent with the shape at other locations, thereby improving the accuracy of the glue-covered profile.

[0054] In addition, when the cross-sectional shape of the inner tube 109 of the needle tube 102 is circular, elliptical, D-shaped, triangular or square, the control method of the rotation drive unit 205 is substantially the same as described above and will not be described in detail here.

[0055] It is conceivable that the driving method of the rotary drive unit 205 is not particularly limited as long as it can drive the dispensing needle assembly 100. For example, a combination of a servo motor 206 and a belt transmission mechanism 207 can be used to drive the dispensing needle assembly 100. In some embodiments, for example, a shaft-shaped rotating member 208 is further included. The rotating member 208 is mounted to the second base 202 and rotated by the rotary drive unit 205. The rotating member 208 is provided with a second glue pipeline 209 running through the rotating member 208 in its axial direction; the first base 101 is mounted to the rotating member 208, and the first glue pipeline 105 is connected to the glue storage unit 203 through the second glue pipeline 209.

[0056] Specifically, the glue reservoir 203 can be mounted on the second base 202. Furthermore, a control valve 210, such as a ceramic rotary valve, is provided on the second base 202 for opening or closing the glue reservoir 203. One end of the control valve 210 is connected to the glue outlet of the glue reservoir 203, and the other end of the control valve 210 is connected to a conversion joint 211. A rotating member 208 is supported on the second base 202 via a bearing seat 212. One of the timing belts of the belt transmission mechanism 207 is nested on the rotating member 208, and the other is nested on the output shaft of the servo motor 206. Furthermore, one end of the rotating member 208 is sealably inserted into the conversion joint 211, and the first base 101 of the dispensing needle assembly 100 is nested on the other end of the rotating member 208. As a result, the first glue line 105 of the first base 101 communicates with the glue reservoir 203 via the second glue line 209 of the rotating member 208.

[0057] The various specific technical features described in the above specific embodiments can be combined in any way without contradiction. To avoid unnecessary repetition, the present invention does not separately explain various possible combinations.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the same. Any modifications or equivalent replacements that do not depart from the scope of the present invention should be included in the technical solutions of the present invention.

Claims

1. Glue dispensing device, characterized in that, include: A first driving unit, driving linearly along the X-axis direction; a second base mounted on the first driving portion and driven by the first driving portion to move linearly; a second driving part, driving linearly along the Y-axis direction, the first driving part being mounted on the second driving part; A dispensing needle assembly, comprising: A first base, wherein the dispensing needle assembly is mounted to the second base via the first base, wherein the first base is provided with a first glue pipeline extending therethrough, wherein the first glue pipeline has a large diameter portion and a small diameter portion, wherein the large diameter portion and the small diameter portion are connected; The needle tube has a needle tube sliding portion, the needle tube sliding portion is partially accommodated in the small diameter portion, and the needle tube sliding portion is free to slide in the small diameter portion, the needle tube is in a straight tubular shape, and a first groove is formed on the end surface of the tube wall portion of the end of the needle tube where the glue is discharged, the first groove is in a V-shape or a U-shape, and the first groove extends through the tube wall portion from the radial middle portion of the needle tube; a sealing portion accommodated in the large-diameter portion and configured to seal a gap between the needle tube sliding portion and the small-diameter portion after the needle tube sliding portion is accommodated in the small-diameter portion; a fastening portion configured to fasten the needle tube to the first base; a rotation drive unit mounted on the second base, the rotation drive unit being configured to drive the dispensing needle assembly to rotate by driving the needle tube itself to rotate when the first drive unit drives the needle tube to move along the X-axis direction and the second drive unit continues to drive the needle tube to move along the Y-axis direction; The glue storage portion is communicated with the first glue pipeline.

2. The dispensing device according to claim 1, characterized in that: The cross-section of the inner tube of the needle tube is circular, elliptical, D-shaped, triangular or square.

3. The dispensing device according to claim 1 or 2, characterized in that: The sealing portion includes a sealing ring, and the sealing ring is embedded on the outer circumference of the needle tube.

4. The dispensing device according to claim 3, characterized in that: The sealing portion further includes a compression ring, one axial end of which abuts against and presses the sealing ring so that the sealing ring sticks to the outer circumference of the needle tube.

5. The dispensing device according to claim 1 or 2, characterized in that: The first base is provided with a first threaded hole penetrating through a side wall thereof, the first threaded hole being connected to the small diameter portion; The fastening portion includes a first threaded member, which is threadedly connected to the first threaded hole and tightens the needle tube.

6. The dispensing device according to claim 1, characterized in that: The invention also includes a shaft-shaped rotating member, the rotating member is mounted on the second base and is rotated by the rotary drive unit, and the rotating member is provided with a second glue pipeline running through the axial direction thereof; The first base is mounted on the rotating member, and the first glue pipeline is communicated with the glue storage portion through the second glue pipeline.

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