A dispensing needle cleaning device

Abstract

The present invention discloses a glue dispensing needle cleaning device, including a cleaning cylinder and an air source device, wherein the cleaning cylinder is provided with a through hole for inserting the glue dispensing needle, an upper annular cavity arranged around the through hole is provided in the cylinder arm wall at the upper end of the cleaning cylinder, and a plurality of cleaning holes penetrating to the through hole are provided on the upper annular cavity; an air jet groove inclined downward is provided on the inner wall of the through hole, and the air jet groove is arranged below the cleaning hole; the upper annular cavity and the air jet groove are both connected to the air source device; when cleaning the glue dispensing needle, the flow rate of the gas ejected from the air jet groove is greater than the flow rate of the gas ejected from the cleaning hole. The glue dispensing needle cleaning device of the present invention can not only effectively avoid the situation that the gas ejected from the air jet groove carries the residual glue and splashes out from the upper opening of the through hole, but also can quickly discharge the residual glue into the collecting barrel to avoid clogging of the through hole.

Description

Technical Field

[0001] The invention relates to a cleaning device, in particular to a dispensing needle cleaning device. Background Art

[0002] During the dispensing process, residual glue will be left on the dispensing needle of the dispensing device. When the residual glue accumulates too much, the dispensing needle will be blocked, affecting the dispensing accuracy and even the product quality.

[0003] At present, a through hole is provided in the cleaning cylinder, and two cleaning holes are arranged oppositely in the through hole. The two cleaning holes clean the residual glue on the glue dispensing needle in the cleaning through hole by ejecting gas. In the cleaning device in the prior art, the two cleaning holes eject gas to clean the glue dispensing needle at the same time. The ejected gas may be ejected from the upper opening of the through hole due to lack of guidance. The gas ejected from the upper opening of the through hole carries some residual glue, which splashes around the cleaning device, greatly affecting the environment around the cleaning device. Summary of the invention

[0004] The object of the present invention is to provide a dispensing needle cleaning device to overcome the defect in the prior art that residual glue is easily splashed out from the upper opening of the through hole.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A dispensing needle cleaning device, comprising a cleaning cylinder and an air source device, wherein the cleaning cylinder is provided with a through hole for inserting the dispensing needle, an upper annular cavity surrounding the through hole is opened in the cylinder wall at one end of the cleaning cylinder, and a plurality of cleaning holes penetrating to the through hole are opened on the cavity wall of the upper annular cavity;

[0007] An air-jet slot inclined downward is provided on the inner wall of the through hole, and the air-jet slot is arranged below the cleaning hole;

[0008] The upper annular cavity and the air injection groove are both connected to the air source device;

[0009] When cleaning the dispensing needle, the flow rate of the gas ejected from the jetting slot is greater than the flow rate of the gas ejected from the cleaning hole.

[0010] Optionally, a lower annular cavity surrounding the through hole is opened in the cylinder wall of the cleaning cylinder, and the lower annular cavity is located below the upper annular cavity. The jet groove is an inclined annular groove, which connects the lower annular cavity and the through hole, and one end of the annular groove close to the lower annular cavity is higher than the other end close to the through hole.

[0011] Optionally, the cleaning cylinder comprises a core, an upper cylinder and a lower cylinder;

[0012] The outer walls of both ends of the core are provided with steps;

[0013] The upper cylinder is threadedly connected to the core, and the upper annular cavity is formed between the upper cylinder, the first step of the step and the second step of the step;

[0014] The lower cylinder is threadedly connected to the core, and the lower annular cavity is formed between the lower cylinder, the third step of the step and the fourth step of the step;

[0015] The fourth step is provided with an inverted cone-shaped inclined stop surface, the lower cylinder is provided with a protrusion opposite to the inclined stop surface, a gap is left between the protrusion and the inclined stop surface, and the protrusion and the inclined stop surface constitute the air injection slot.

[0016] The dispensing needle cleaning device also includes a first sealing element, a second sealing element and a sealing gasket. The first sealing element is arranged at the junction of the first step and the upper cylinder; the second sealing element is arranged at the junction of the third step and the lower cylinder; the sealing gasket is arranged between the upper cylinder and the lower cylinder, and the two side surfaces of the sealing gasket are respectively against the upper cylinder and the lower cylinder.

[0017] Optionally, a first air inlet connected to the upper annular cavity is provided on the outer wall of the upper cylinder, a second air inlet connected to the lower annular cavity is provided on the outer wall of the lower cylinder, a first air pipe joint is provided on the first air inlet, a second air pipe joint is provided on the second air inlet, a first control valve is provided between the air source device and the first air pipe joint, and a second control valve is provided between the air source device and the second air pipe joint.

[0018] Optionally, the sum of the cross-sectional areas of all the cleaning holes is not greater than the cross-sectional area of ​​the first air inlet.

[0019] Optionally, the number of the cleaning holes is an even number, the cleaning holes are symmetrically arranged on the inner wall of the through hole, and the heights of the cleaning holes are kept consistent.

[0020] Optionally, it further comprises a bracket and a collecting barrel, the cleaning cylinder is vertically fixed on the bracket, the collecting barrel is arranged below the cleaning cylinder, and the lower end of the lower cylinder is provided with a cylinder part extending toward the collecting barrel.

[0021] Optionally, the cleaning holes are arranged obliquely downward from the upper annular cavity toward the through hole, and the axes of all the cleaning holes intersect with the axis of the through hole at one point.

[0022] Optionally, a Teflon coating is provided on the inner wall of the through hole.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In an embodiment of the present invention, a cleaning cylinder is provided with a through hole, in which at least three cleaning holes are opened, and a downwardly inclined jet groove is provided below the cleaning hole. When cleaning the dispensing needle, the flow rate of the gas ejected from the jet groove is greater than the flow rate of the gas ejected from the cleaning hole. The gas ejected from the jet groove at a high speed and inclined downward will generate suction on the gas above the jet groove. The gas ejected from the jet groove is forced to flow out only from the lower outlet of the through hole, so that the residual glue can only be discharged from the lower opening of the cleaning cylinder, effectively avoiding the residual glue from splashing out from the upper opening of the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0027] Figure 1 A schematic diagram of the structure of a cleaning cylinder in a dispensing needle cleaning device provided in Embodiment 1 of the present invention;

[0028] Figure 2 for Figure 1 AA section structure schematic diagram in;

[0029] Figure 3 A schematic diagram of the structure of a dispensing needle cleaning device provided in Embodiment 1 of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a dispensing needle cleaning device provided in Embodiment 2 of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the dispensing needle cleaning device provided in Example 3 of the present invention.

[0032] Illustrations: 1. Cleaning cylinder; 11. Through hole; 12. Upper annular cavity; 13. Cleaning hole; 14. Jet slot; 15. Lower annular cavity; 2. Core; 21. First step; 22. Second step; 23. Third step; 24. Fourth step; 25. Inclined blocking surface; 3. Upper cylinder; 31. First air inlet; 32. First air pipe joint; 33. Protrusion; 4. Lower cylinder; 41. Second air inlet; 42. Second air pipe joint; 43. Cylinder portion; 5. First sealing element; 6. Second sealing element; 7. Bracket; 8. Aggregate barrel; 9. Sealing gasket. DETAILED DESCRIPTION

[0033] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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 creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] Embodiment 1

[0037] See also Figure 1-3 The embodiment of the present invention provides a dispensing needle cleaning device for cleaning the residual glue on the dispensing needle. During the cleaning process, the residual glue can be effectively prevented from splashing out to the outside and polluting the environment, and the residual glue can be effectively prevented from clogging the through hole 11.

[0038] The dispensing needle cleaning device includes a cleaning cylinder 1, which is provided with a through hole 11 for inserting the dispensing needle. The cylinder is provided with an upper annular cavity 12, and the upper annular cavity 12 is provided with a plurality of cleaning holes 13 connected to the through hole 11. The upper annular cavity 12 is connected to the air source device, and the gas of the air source device is sprayed from the cleaning hole 13 to the dispensing needle located in the through hole 11, so as to complete the cleaning of the dispensing needle.

[0039] The jet groove 14 is connected to the air source device. When cleaning the dispensing needle, the flow rate of the gas ejected from the jet groove 14 is greater than the flow rate of the gas ejected from the cleaning hole 13. The jet groove 14 tilts downward to eject gas to attract the gas ejected from the cleaning hole 13 above and the residual glue dripping from the dispensing needle to prevent the residual glue from splashing out of the device from the upper opening of the through hole 11.

[0040] In addition, the setting of the upper annular cavity 12 is conducive to balancing the pressure difference of each cleaning hole 13, avoiding excessive difference in the speed of the gas sprayed from different cleaning holes 13, which causes the residual glue on the dispensing needle to splash out of the device due to uneven force.

[0041] It should be known that the residual glue is a high-viscosity substance and is extremely easy to adhere to the inner wall of the through hole 11, resulting in poor exhaust of the through hole 11 and easy blockage in the through hole 11. When the inclined jet slot 14 is jetting, it will not only attract the residual glue above the jet slot 14 to be discharged downward, but also blow the residual glue below the jet slot 14 to be discharged downward, which is conducive to accelerating the discharge of the residual glue in the through hole 11. Furthermore, the diameter of the upper opening of the through hole 11 can be set to be adapted to the diameter of the glue dispensing needle, such as any value between 3mm and 6mm. Specifically, the diameter of the through hole 11 can be set to 5mm.

[0042] A lower annular cavity 15 is also provided in the cleaning cylinder 1. The lower annular cavity 15 is located below the upper annular cavity 12. The jet groove 14 is an inclined annular groove. The annular groove connects the lower annular cavity 15 and the through hole 11. The end of the annular groove close to the lower annular cavity 15 is higher than the end close to the through hole 11. Specifically, the shape of the jet groove 14 is similar to the shape of an inverted cone shell after removing the shell tip, which is an annular opening inclined downward. The setting of the lower annular cavity 15 is conducive to balancing the speed of the gas ejected from the jet groove 14 in all directions. The gas of the gas source can be ejected obliquely downward from the annular opening of the jet groove 14 from the through hole 11 to avoid gas turbulence. Gas turbulence will affect the collection effect of residual glue and slow down the collection speed of residual glue.

[0043] The cleaning cylinder 1 in this embodiment includes a core 2 , an upper cylinder 3 and a lower cylinder 4 .

[0044] The core 2 is threadedly connected to the upper cylinder 3 to form an upper annular cavity 12, and the lower end of the core 2 is threadedly connected to the lower cylinder 4 to form a lower annular cavity 15. Specifically, steps are provided on the outer walls of both ends of the core 2; the upper cylinder 3 is threadedly connected to the core 2, and the upper annular cavity 12 is formed between the upper cylinder 3, the first step 21 of the step, and the second step 22 of the step; the lower cylinder 4 is threadedly connected to the core 2, and the lower annular cavity 15 is formed between the lower cylinder 4, the third step 23 of the step, and the fourth step 24 of the step. It should be known that the second step 22 is provided with a connecting thread.

[0045] The lower cylinder 4 is located below the upper cylinder 3, and the fourth step 24 is provided with an inverted cone-shaped inclined stop surface 25. A gap is left between the protrusion 33 of the lower cylinder 4 and the inclined stop surface 25, and the protrusion 33 and the inclined stop surface 25 constitute the jet groove 14. The core 2 and the upper cylinder 3 are threadedly connected. When foreign matter blocks the cleaning hole, the core 2 and the upper cylinder 3 can be disassembled to clean the foreign matter in the cleaning hole 13 or the upper annular cavity 12; similarly, the core 2 and the lower cylinder 4 are threadedly connected. If foreign matter blocks the jet groove 14 when the device is idle, the foreign matter in the jet groove 14 or the lower annular cavity 15 can also be disassembled to clean the foreign matter.

[0046] The first sealing element 5 is provided at the joint between the first step 21 and the upper end of the upper cylinder 3, and the core 2 is threadedly connected to the lower end of the upper cylinder 3. It should be known that the threaded connection here has a good sealing effect. The second sealing element 6 is provided at the joint between the third step 23 and the lower cylinder 4, so that the gas can only be ejected from the jet groove 14. A sealing gasket 9 is provided between the upper cylinder 3 and the lower cylinder 4 to prevent air leakage. One side of the sealing element 9 is against the bottom surface of the upper cylinder 3, and the other side is against the top surface of the lower cylinder 4. The first sealing element 5, the second sealing element 6 and the sealing gasket 9 are all used to prevent air leakage from the outer wall of the cleaning cylinder 1. Specifically, the first sealing element 5 and the second sealing element 6 are both O-rings.

[0047] Optionally, a first air inlet 31 connected to the upper annular cavity 12 is provided on the outer wall of the upper cylinder 3, a first air pipe joint 32 is provided on the first air inlet 31, a first control valve is provided between the air source device and the first air pipe joint 32, and the first control valve is used to control the pressure and gas flow of the gas from the air source entering the upper annular cavity 12; a second air inlet 41 connected to the lower annular cavity 15 is opened on the outer wall of the lower cylinder 4, a second air inlet 41 is provided with a second air pipe joint 42, a second control valve is provided between the air source device and the second air pipe joint 42, and the second control valve is used to control the pressure and gas flow of the gas from the air source entering the upper annular cavity 12.

[0048] The sum of the cross-sectional areas of all cleaning holes 13 is not greater than the cross-sectional area of ​​the first air inlet 31 to avoid excessive pressure drop affecting the cleaning effect of the dispensing needle.

[0049] The number of the cleaning holes 13 is an even number. The cleaning holes 13 are relatively arranged on the inner wall of the through hole 11 , and the heights of the cleaning holes 13 arranged on the inner wall of the through hole 11 are kept consistent.

[0050] The dispensing needle cleaning device also includes a bracket 7 and a collecting barrel 8. The cleaning cylinder 1 is vertically fixed on the bracket 7. The collecting barrel 8 is arranged below the cleaning cylinder 1. The lower end of the lower cylinder 4 is provided with a cylinder part 43 extending toward the collecting barrel 8. The inner hole of the cylinder part 43 is connected to the through hole 11, and the residual glue falls from the lower end of the cylinder part 43 into the collecting barrel.

[0051] The cleaning holes 13 are arranged obliquely downward from the upper annular cavity 12 toward the through hole 11, and the axes of all the cleaning holes 13 intersect at one point with the axis of the through hole 11. The cleaning holes 13 obliquely downward can further prevent residual glue from splashing out from the upper opening of the through hole 11.

[0052] Furthermore, a moving device for moving the dispensing needle into the through hole 11 may be provided.

[0053] The inner wall of the through hole 11 is provided with a Teflon (polytetrafluoroethylene) coating, which has an extremely low friction coefficient, making it difficult for residual glue to adhere to the inner wall of the through hole 11. Together with the jet groove 14, the through hole 11 can be effectively prevented from being blocked.

[0054] Embodiment 2

[0055] See also Figure 4 Compared with the first embodiment, the inner diameter of the lower cylinder 4 in this embodiment is consistent with the diameter of the through hole 11, and the air injection groove 14 is inclined downward and penetrates the through hole 11. In this embodiment, the upper annular cavity 12 and the lower annular cavity 15 are both connected to the air source device.

[0056] Embodiment 3

[0057] See also Figure 5 In this embodiment, the cleaning cylinder 1 is an integrated structure, and an upper annular cavity 12 and a lower annular cavity 15 are spaced apart from each other from top to bottom. The upper annular cavity 12 and the lower annular cavity 15 are both arranged in the cylinder wall of the cleaning cylinder 1 around the through hole 11. The jet groove 14 is an annular groove, which is inclined downward from the cavity wall of the lower annular cavity to the through hole 11. The upper annular cavity 12 and the lower annular cavity 15 are both connected to the air source device. Specifically, the cross-sections of the upper annular cavity 12 and the lower annular cavity 15 can be set to be circular, elliptical, rectangular or other shapes. The one-piece cleaning cylinder has good air tightness and is conducive to reducing the volume of the device.

[0058] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dispensing needle cleaning device, characterized in that: The cleaning cylinder (1) comprises a cleaning cylinder (1) and an air source device, wherein the cleaning cylinder (1) is provided with a through hole (11) for inserting a dispensing needle, an upper annular cavity (12) arranged around the through hole (11) is provided in the cylinder wall at one end of the cleaning cylinder (1), and a plurality of cleaning holes (13) penetrating to the through hole (11) are provided on the cavity wall of the upper annular cavity (12); An air-jet slot (14) inclined downward is provided on the inner wall of the through hole (11), and the air-jet slot (14) is arranged below the cleaning hole (13); The upper annular cavity (12) and the air injection groove (14) are both connected to the air source device; When cleaning the dispensing needle, the flow rate of the gas ejected from the jetting slot (14) is greater than the flow rate of the gas ejected from the cleaning hole (13); A lower annular cavity (15) is provided in the wall of the cleaning cylinder (1) and is arranged around the through hole (11). The lower annular cavity (15) is located below the upper annular cavity (12). The jet groove (14) is an inclined annular groove, which connects the lower annular cavity (15) and the through hole (11). One end of the annular groove close to the lower annular cavity (15) is higher than the other end close to the through hole (11). The cleaning cylinder (1) comprises a core (2), an upper cylinder (3) and a lower cylinder (4); The outer walls of both ends of the core (2) are provided with steps; The upper cylinder (3) is threadedly connected to the core (2), and the upper annular cavity (12) is formed between the upper cylinder (3), the first step (21) of the step, and the second step (22) of the step; The lower cylinder (4) is threadedly connected to the core (2), and the lower annular cavity (15) is formed between the lower cylinder (4), the third step (23) of the step, and the fourth step (24) of the step; The fourth step (24) is provided with an inverted cone-shaped inclined stop surface (25), the lower cylinder (4) is provided with a protrusion (33) opposite to the inclined stop surface (25), a gap is left between the protrusion (33) and the inclined stop surface (25), and the protrusion (33) and the inclined stop surface (25) constitute the air injection groove (14); It also comprises a first sealing element (5), a second sealing element (6) and a sealing gasket (9), wherein the first sealing element (5) is arranged at the joint between the first step (21) and the upper cylinder (3); the second sealing element (6) is arranged at the joint between the third step (23) and the lower cylinder (4); the sealing gasket (9) is arranged between the upper cylinder (3) and the lower cylinder (4), and the two side surfaces of the sealing gasket (9) are respectively against the upper cylinder (3) and the lower cylinder (4); A first air inlet (31) connected to the upper annular cavity (12) is provided on the outer wall of the upper cylinder (3), a second air inlet (41) connected to the lower annular cavity (15) is provided on the outer wall of the lower cylinder (4), a first air pipe joint (32) is provided on the first air inlet (31), a second air pipe joint (42) is provided on the second air inlet (41), a first control valve is provided between the air source device and the first air pipe joint (32), and a second control valve is provided between the air source device and the second air pipe joint (42).

2. The dispensing needle cleaning device according to claim 1, characterized in that: The sum of the cross-sectional areas of all the cleaning holes (13) is no greater than the cross-sectional area of ​​the first air inlet (31).

3. The dispensing needle cleaning device according to claim 1, characterized in that: The number of the cleaning holes (13) is an even number, the cleaning holes (13) are symmetrically arranged on the inner wall of the through hole (11), and the heights of the cleaning holes (13) are kept consistent.

4. The dispensing needle cleaning device according to claim 1, characterized in that: It also includes a bracket (7) and a collecting barrel (8), wherein the cleaning cylinder (1) is vertically fixed on the bracket (7), the collecting barrel (8) is arranged below the cleaning cylinder (1), and the lower end of the lower cylinder (4) is provided with a cylinder portion (43) extending toward the collecting barrel (8).

5. The dispensing needle cleaning device according to claim 1, characterized in that: The cleaning holes (13) are arranged obliquely downward from the upper annular cavity (12) toward the through hole (11), and the axes of all the cleaning holes (13) intersect with the axis of the through hole (11) at one point.

6. The dispensing needle cleaning device according to claim 1, characterized in that: The inner wall of the through hole (11) is provided with a Teflon coating.

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