Anti-curing dispensing needle head

Abstract

The anti-curing dispensing needle head comprises a needle head body, a sealing sleeve is arranged on the outer surface of the needle head body, and a detachable sealing cover is arranged at the tail end of the sealing sleeve; external threads are arranged on the outer wall of the glue outlet end of the needle body, and matched internal threads are correspondingly arranged on the inner wall of the sealing cover; an annular sealing groove is formed in the inner side of the sealing cover; an elastic sealing ring is arranged in the sealing groove; a paraffin storage cavity is formed in the sealing cover, a permeable membrane is arranged at the bottom of the storage cavity, and the tail end of the needle body extends to form a conical immersion part. According to the technical scheme, the sealing sleeve is additionally arranged on the dispensing needle head, and the dispensing needle head is sealed by the sealing cover when equipment is shut down, so that RTV glue is prevented from being in contact with the outside, and the RTV glue at the needle head is prevented from being cured. And the dispensing needle head is provided with an external thread and is interlocked with the sealing cover. A sealing ring is additionally arranged in the sealing cover, paraffin can be added, the needle head is immersed into the paraffin, and the sealing performance is further improved.

Description

Technical Field

[0001] This utility model relates to the field of dispensing technology, and more specifically, to an anti-curing dispensing needle. Background Technology

[0002] During casting assembly, RTV adhesive is used to bond the cover plate to the casting to ensure adhesion. RTV adhesive generally cures naturally, reacting with moisture in the air to harden. Initial curing time is typically 20 minutes, with full curing taking 24 hours. During production, RTV adhesive is dispensed through a dispensing needle. During shift changes or holidays, the needle may become clogged due to the natural curing of the RTV adhesive, resulting in uneven dispensing or no dispensing at all. Utility Model Content

[0003] The purpose of this invention is to propose an anti-curing dispensing needle, which aims to solve some of the technical problems existing in the prior art.

[0004] Specifically, the technical solution of this utility model is as follows: an anti-curing dispensing needle, including a needle body, a sealing sleeve provided on the outer surface of the needle body, and a detachable sealing cap provided at the end of the sealing sleeve; the outer wall of the dispensing end of the needle body is provided with external threads, and the inner wall of the sealing cap is provided with matching internal threads; the inner side of the sealing cap is provided with an annular sealing groove, and an elastic sealing ring is built into the sealing groove; the inside of the sealing cap is also provided with a paraffin storage cavity, the bottom of the storage cavity is provided with a permeation membrane, and the end of the needle body extends to form a conical immersion part.

[0005] As a preferred technical solution, the sealing sleeve is made of corrosion-resistant elastic material, and it is heat-fused with the needle body to form an airtight connection. The sleeve has at least two equidistant observation windows axially distributed.

[0006] As a preferred technical solution, the internal thread adopts a trapezoidal thread structure with a pitch of 0.8-1.2mm and a thread depth of 0.3-0.5mm, and the thread mating surface is coated with a silicone grease layer.

[0007] As a preferred technical solution, the elastic sealing ring is made of fluororubber, with an X-shaped cross-section, a compression rate of 25%-30%, and an interference fit between the inner diameter of the sealing ring and the outer diameter of the needle body of 0.1-0.3mm.

[0008] As a preferred technical solution, the paraffin storage cavity is filled with microcrystalline paraffin, and the volume of the storage cavity is the same as that of a needle tip. As a preferred technical solution, the thickness of the permeation membrane is 0.1-0.15 mm.

[0009] As a preferred technical solution, the cone angle of the conical immersion part is 15°-25°, the surface is provided with a spiral guide groove, and the end of the immersion part is provided with a hemispherical closed end.

[0010] As a preferred technical solution, an annular buffer cavity is formed between the sealing sleeve and the needle body, and the buffer cavity is filled with inert gas at a pressure of 0.05-0.1 MPa.

[0011] As a preferred technical solution, the inner wall of the needle body is provided with a nano-ceramic coating with a thickness of 20-50μm and a surface roughness Ra≤0.2μm.

[0012] As a preferred technical solution, the sealing cover has a built-in humidity sensor, which is connected to a wireless transmission module. An LED indicator is provided on the outside of the cover, and the three together constitute a sealing status monitoring system.

[0013] The beneficial effects of this utility model are as follows: This technical solution adds a sealing sleeve to the dispensing needle. When the equipment is stopped, the dispensing needle is sealed with the sealing cap to prevent the RTV adhesive from contacting the outside environment, thereby preventing the RTV adhesive at the needle tip from curing. The dispensing needle has external threads that interlock with the sealing cap. A sealing ring is added inside the sealing cap, and paraffin wax can be added to immerse the needle tip in the paraffin wax, further improving the sealing performance. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of an anti-curing dispensing needle proposed in an embodiment of the present invention;

[0016] Figure 2 This is an assembly diagram illustrating the structure of an anti-curing dispensing needle according to an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached drawings: sealing sleeve 1; sealing cap 11; internal thread 111; paraffin storage cavity 112; microcrystalline wax 113; sealing ring 114; needle body 2; external thread 21. Detailed Implementation

[0018] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0019] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0020] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0021] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0022] It should be noted that "multiple" as mentioned in this article refers to two or more.

[0023] Example

[0024] like Figure 1-2 As shown, this embodiment presents an anti-curing dispensing needle, comprising a needle body 2, a sealing sleeve 1 on the outer surface of the needle body 2, and a removable sealing cap 11 at the end of the sealing sleeve 1; the outer wall of the dispensing end of the needle body 2 has an external thread 21, and the inner wall of the sealing cap 11 has a matching internal thread 111; the inner side of the sealing cap 11 has an annular sealing groove, and an elastic sealing ring 114 is built into the sealing groove; the inside of the sealing cap 11 also has a paraffin storage cavity 112, and a permeation membrane is provided at the bottom of the storage cavity; the end of the needle body 2 extends to form a conical immersion part. The conical immersion part, combined with a spiral guide groove design, ensures that the paraffin uniformly coats the needle.

[0025] By adding a sealing sleeve 1 to the dispensing needle, the dispensing needle is sealed with a sealing cap 11 when the equipment is stopped, preventing the RTV adhesive from contacting the outside environment and thus preventing the RTV adhesive at the needle from curing. The dispensing needle has an external thread 21 that interlocks with the sealing cap 11. A sealing ring 114 is added inside the sealing cap 11, and paraffin wax can be added to immerse the needle in the paraffin wax, further improving the sealing performance.

[0026] Preferably, the sealing sleeve 1 is made of a corrosion-resistant elastic material, and it is heat-fused with the needle body 2 to form an airtight connection. The sleeve has at least two equidistant observation windows axially distributed.

[0027] Preferably, the internal thread 111 adopts a trapezoidal thread structure with a pitch of 0.8-1.2mm and a thread depth of 0.3-0.5mm, and the thread mating surface is coated with a silicone grease layer. The trapezoidal thread combined with the silicone grease coating improves sealing reliability and reusability.

[0028] Preferably, the elastic sealing ring 114 is made of fluororubber, with an X-shaped cross-section and a compression rate of 25%-30%. The interference fit between the inner diameter of the sealing ring 114 and the outer diameter of the needle body 2 is 0.1-0.3 mm.

[0029] Preferably, the paraffin storage cavity 112 is filled with microcrystalline paraffin 113, the volume of the storage cavity is 1.2-1.5 times the volume of the needle tip, and the thickness of the permeation membrane is 0.1-0.15 mm.

[0030] Preferably, the cone angle of the conical immersion part is 15°-25°, the surface is provided with a spiral guide groove, and the end of the immersion part is provided with a hemispherical closed end.

[0031] Preferably, not shown in the figure, an annular buffer cavity is formed between the sealing sleeve 1 and the needle body 2, and the buffer cavity is filled with inert gas at a pressure of 0.05-0.1 MPa. The addition of the annular buffer cavity and the filling with inert gas prevents air infiltration through a positive pressure environment.

[0032] Preferably, the inner wall of the needle body 2 is coated with a nano-ceramic coating with a thickness of 20-50 μm and a surface roughness Ra≤0.2 μm. The nano-ceramic coating reduces the adhesion of colloids and forms a double protection in conjunction with the sealing structure.

[0033] Preferably, (not shown in the figure), a humidity sensor can also be installed inside the sealing cover 11. The sensor is connected to a wireless transmission module, and an LED indicator is provided on the outside of the cover. The three components constitute a sealing status monitoring system. The integrated humidity monitoring system provides real-time feedback on the sealing status, meeting the requirements of smart manufacturing.

[0034] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cure-in-place dispensing needle comprising a needle body, characterized by, The outer surface of the needle body is provided with a sealing sleeve, and the end of the sealing sleeve is provided with a detachable sealing cap; the outer wall of the dispensing end of the needle body is provided with external threads, and the inner wall of the sealing cap is provided with matching internal threads; the inner side of the sealing cap is provided with an annular sealing groove, and the sealing groove contains an elastic sealing ring; the inside of the sealing cap is also provided with a paraffin storage cavity, the bottom of the storage cavity is provided with a permeation membrane, and the end of the needle body extends to form a conical immersion part.

2. The anti-cure dispensing needle of claim 1, wherein, The sealing sleeve is made of corrosion-resistant elastic material and is connected to the needle body by heat fusion to form an airtight connection. The sleeve has at least two equidistant observation windows axially distributed.

3. The anti-cure dispensing needle of claim 2, wherein, The internal thread adopts a trapezoidal thread structure with a pitch of 0.8-1.2mm and a thread depth of 0.3-0.5mm. The thread mating surface is coated with a silicone grease layer.

4. The anti-cure dispensing needle of claim 3, wherein, The elastic sealing ring is made of fluororubber, with an X-shaped cross-section and a compression rate of 25%-30%. The interference fit between the inner diameter of the sealing ring and the outer diameter of the needle body is 0.1-0.3mm.

5. The anti-cure dispensing needle of claim 4, wherein, The paraffin storage cavity is filled with microcrystalline paraffin, and the volume of the storage cavity is 1.2-1.5 times the volume of the needle tip.

6. The anti-cure dispensing needle of claim 5, wherein, The thickness of the permeation membrane is 0.1-0.15 mm.

7. The cure resistant dispensing needle of claim 1, wherein, The cone angle of the conical immersion part is 15°-25°, the surface is provided with a spiral guide groove, and the end of the immersion part is provided with a hemispherical closed end.

8. The cure resistant dispensing needle of claim 1, wherein, An annular buffer cavity is formed between the sealing sleeve and the needle body, and the buffer cavity is filled with inert gas at a pressure of 0.05-0.1 MPa.

9. The anti-curing dispensing needle according to claim 1, characterized in that, The inner wall of the needle body is coated with a nano-ceramic coating with a thickness of 20-50 μm and a surface roughness Ra≤0.2 μm.

10. The cure resistant dispensing needle of claim 1, wherein, The sealing cover has a built-in humidity sensor. The sensor is connected to a wireless transmission module, and an LED indicator is installed on the outside of the cover. The three together constitute a sealing status monitoring system.

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