Nozzle connecting structure and laser cutting machine comprising same

Abstract

The utility model provides a nozzle connecting structure and a laser cutting machine comprising the same. The nozzle connecting structure comprises a metal nozzle and a ceramic ring, the ceramic ring is hollow, a connecting boss is arranged at the top end of the ceramic ring, and internal threads are arranged on the inner wall of the bottom end of the ceramic ring; the upper part of the metal nozzle is a connecting part and is provided with an external thread matched with the internal thread, and the lower part of the metal nozzle is an inverted frustum-shaped light emitting part; the threaded connection part between the ceramic ring and the metal nozzle is filled with conductive high-temperature solder paste; an inclined through hole is formed in the top face of the ceramic ring, and a metal needle penetrates through the through hole to make contact with the metal nozzle. The problem that a traditional connecting structure is poor in heat resistance can be solved, the connecting structure is stable, and installation is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting machines, in particular to a nozzle connection structure and a laser cutting machine comprising the same. Background Art

[0002] The nozzle at the bottom of the laser cutting machine can effectively prevent the molten stains and other debris from rebounding upwards and contaminating the focusing lens, and can also control the gas diffusion area and size, thereby controlling the cutting quality. It is an essential component of the laser cutting machine. During laser cutting, high temperatures will be generated at the nozzle, and the nozzle needs to maintain an incomplete metal connection with the upper component, so a ceramic component is used to ensure partial insulation and better heat insulation.

[0003] Currently, existing laser cutting machines usually use conductive glue to connect the nozzle to the ceramic. However, the conductive glue has a reduced conductivity after being heated, and is prone to aging when heated.

[0004] Therefore, developing a nozzle connection structure with good heat resistance and a laser cutting machine including the same is a technical problem to be solved. Utility Model Content

[0005] Since the prior art has the above-mentioned defects, the utility model provides a nozzle connection structure and a laser cutting machine including the same, so as to solve the problem that the traditional connection structure has poor heat resistance.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a nozzle connection structure, including a metal nozzle and a ceramic ring; the characteristics are:

[0007] The ceramic ring is hollow inside, with a connecting boss at the top and an internal thread on the inner wall of the bottom; the upper part of the metal nozzle is a connecting part, with an external thread matching the internal thread, and the lower part is an inverted cone-shaped light outlet; the threaded connection part between the ceramic ring and the metal nozzle is filled with conductive high-temperature tin paste to form a whole;

[0008] The ceramic ring has an inclined through hole on the top surface, and a metal needle passes through the through hole and contacts the metal nozzle.

[0009] When using the nozzle connection structure, first screw the metal nozzle into the thread of the ceramic ring, inject conductive high-temperature tin paste from the through hole of the ceramic ring through a micro needle barrel, and then insert a metal needle from the through hole. The metal needle protrudes 1 to 2 mm from the upper surface of the ceramic ring. Then, a small press is used to press the metal needle until it is completely flush with the upper surface of the ceramic ring. Then, an adjustable heating oven is used to heat the ceramic body as a whole. The tin paste is softened in the oven and filled in the threaded connection, so that the metal needle and the metal nozzle have good electrical contact, and the strength of the threaded connection is guaranteed so that it cannot be screwed out. Finally, the entire finished product is placed in an ultrasonic cleaning machine for cleaning.

[0010] Furthermore, the ceramic ring is in the shape of an inverted frustum.

[0011] Furthermore, the connecting portion and the light emitting portion are detachably fixedly connected.

[0012] Furthermore, the conductive high temperature solder paste is a GRN360-K2-V solder paste produced by Senju of Japan or a CVP-390 solder paste produced by Alpha.

[0013] Furthermore, the metal needle is made of nickel silver brass.

[0014] Furthermore, the material of the ceramic ring is alumina ceramic with a purity of 99%.

[0015] Furthermore, the metal nozzle is made of T3 copper.

[0016] On the other hand, the present invention provides a laser cutting machine, characterized in that its laser nozzle part is arranged using the nozzle connection structure as described above.

[0017] Compared with the prior art, the utility model has the following advantages or beneficial effects:

[0018] (1) The utility model utilizes the threaded connection between ceramic and metal, combined with the conductive high-temperature tin paste filling method to achieve the connection between the ceramic ring and the metal nozzle; since the tin paste has the characteristics of low-temperature paste and high-temperature softening, it can withstand high temperatures of 300 to 400 degrees, and still has good conductivity when heated. After the temperature drops, it returns to a paste state to fill the pores of the threaded connection, thereby achieving good conductivity and anti-aging throughout the process;

[0019] (2) The utility model directly taps the ceramic ring, which saves the installation or preparation process of the existing connecting sleeve; the ceramic ring can also be designed into an inverted cone shape to improve the strength of the ceramic and reduce the volume of the ceramic.

[0020] The utility model provides a nozzle connection structure and a laser cutting machine including the same. The nozzle connection structure includes a metal nozzle and a ceramic ring. The ceramic ring is hollow inside, with a connection boss provided on the top and an internal thread provided on the inner wall of the bottom. The upper part of the metal nozzle is a connection part, which is provided with an external thread matching the internal thread, and the lower part is an inverted cone-shaped light outlet. The threaded connection part between the ceramic ring and the metal nozzle is filled with conductive high-temperature tin paste. The ceramic ring has an inclined through hole from the top surface, and a metal needle passes through the through hole to contact the metal nozzle. The utility model can solve the problem of poor heat resistance of traditional connection structures, and the connection structure is stable and more convenient to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention and its features, appearance and advantages will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts in all the drawings. The drawings are not drawn completely to scale, and the emphasis is on illustrating the subject matter of the present invention.

[0022] Figure 1 This is a schematic diagram of the front view of the nozzle connection structure in one embodiment of the utility model;

[0023] Figure 2 This is a schematic cross-sectional view of a nozzle connection structure in one embodiment of the utility model;

[0024] In the accompanying drawings: 1. metal nozzle; 2. ceramic ring; 21. connecting boss; 11. connecting part; 12. light emitting part; 3. metal needle. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be understood that all of these exemplary embodiments described are only partial embodiments and examples of the present utility model, rather than all of them. On the contrary, these exemplary embodiments are provided so that those skilled in the art can more thoroughly understand the present disclosure and can more completely convey the technical content of the present disclosure to those skilled in the art.

[0026] In the description of the present application, the terms "upper", "lower", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0027] Embodiment 1,

[0028] See also Figure 1 and Figure 2 The present embodiment provides a nozzle connection structure, including a metal nozzle 1 and a ceramic ring 2; the ceramic ring 2 is hollow inside, and a connection boss 21 is provided on the top thereof, and an internal thread is provided on the inner wall of the bottom end; the upper part of the metal nozzle 1 is a connection part 11, which is provided with an external thread matching the internal thread, and the lower part is an inverted cone-shaped light outlet part 12; the threaded connection part between the ceramic ring 2 and the metal nozzle 1 is filled with conductive high-temperature tin paste to form a whole; the ceramic ring 2 opens an inclined through hole from the top surface, and a metal needle 3 passes through the through hole to contact the metal nozzle 2.

[0029] Conventionally, the ceramic ring is a hollow cylindrical shape. As a preferred technical solution, further: the ceramic ring 2 is an inverted frustum, which can increase the strength of the ceramic and reduce the volume of the ceramic.

[0030] As a preferred technical solution, further: the connection part 11 and the light-emitting part 12 are detachably fixedly connected, preferably threadedly connected, so as to facilitate the replacement of the light-emitting part at the bottom of the metal nozzle 1. The conductive high-temperature tin paste is the GRN360-K2-V tin paste produced by Senju of Japan or the CVP-390 tin paste produced by Alpha. The conductive high-temperature tin paste has the characteristics of low-temperature paste and high-temperature softening, is resistant to high temperatures of 300 to 400 degrees, and still has good conductivity when heated, and returns to a paste state after the temperature drops to fill the pores of the threaded connection.

[0031] As a preferred technical solution, further: the material of the metal needle 3 is nickel silver brass, which can better transmit the current at the upper end to the nozzle.

[0032] As a preferred technical solution, further: the material of the ceramic ring 2 is alumina ceramic with a purity of 99%, which has good insulation performance and stable structure.

[0033] As a preferred technical solution, further: the material of the metal nozzle 1 is T3 copper, which can better reduce the resistance, ensure the reliability of the work and reduce the failure rate.

[0034] When connecting the nozzle, first screw the metal nozzle 1 into the thread of the ceramic ring 2, inject conductive high-temperature tin paste from the through hole of the ceramic ring 2 through a micro needle barrel, and then insert the metal needle 3 from the through hole. The metal needle 3 protrudes 1 to 2 mm from the upper surface of the ceramic ring 2. Then, use a small press to press the metal needle 3 until it is completely flush with the upper surface of the ceramic ring 2. Then, use an adjustable heating oven to heat the ceramic body as a whole, heat it to 250 degrees, and keep it warm for 2 minutes. In this way, the tin paste will soften in the oven and fill in the threaded connection, so that the metal needle 3 has good electrical contact with the metal nozzle 1, and ensure the strength of the threaded connection so that it cannot be screwed out. Finally, place the entire finished product in an ultrasonic cleaner for cleaning.

[0035] From the above description, it can be seen that the main body of the nozzle connection structure is in the form of a thread, which can ensure tightness and strength. Filling an appropriate amount of conductive high-temperature tin paste can improve the temperature resistance and anti-aging performance of the connection part, thus providing a better technical solution to replace the existing technology.

[0036] Embodiment 2,

[0037] This embodiment provides a laser cutting machine, wherein the laser nozzle part is provided by the nozzle connection structure as described in Embodiment 1. The laser nozzle part is connected to the upper structure of the cutting machine through the connection boss 21 of the ceramic ring 2 and the sealing ring.

[0038] In summary, the present application provides a nozzle connection structure and a laser cutting machine including the same. The nozzle connection structure includes a metal nozzle and a ceramic ring. The ceramic ring is hollow inside, with a connecting boss provided on the top and an internal thread provided on the inner wall of the bottom. The upper part of the metal nozzle is a connection part, which is provided with an external thread matching the internal thread, and the lower part is an inverted cone-shaped light outlet. The threaded connection part between the ceramic ring and the metal nozzle is filled with conductive high-temperature tin paste. The ceramic ring has an inclined through hole from the top surface, and a metal needle passes through the through hole to contact the metal nozzle. The utility model can solve the problem of poor heat resistance of traditional connection structures, and the connection structure is stable and more convenient to install.

[0039] The above describes the preferred embodiments of the utility model. It should be understood that the utility model is not limited to the above-mentioned specific implementation methods, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can use the above-disclosed methods and technical contents to make many possible changes and modifications to the technical solutions of the utility model without departing from the scope of the technical solution of the utility model, or modify them into equivalent embodiments of equivalent changes, which does not affect the essential content of the utility model. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of protection of the technical solution of the utility model.

Claims

1. A nozzle connection structure, comprising a metal nozzle (1) and a ceramic ring (2); characterized in that: The ceramic ring (2) is hollow inside, and has a connecting boss (21) at its top and an internal thread on its bottom inner wall; the upper part of the metal nozzle (1) is a connecting part (11) provided with an external thread matching the internal thread, and the lower part is an inverted cone-shaped light outlet (12); the threaded connection part between the ceramic ring (2) and the metal nozzle (1) is filled with conductive high-temperature tin paste to form a whole; The ceramic ring (2) has an inclined through hole on the top surface, and a metal needle (3) passes through the through hole and contacts the metal nozzle (1).

2. The nozzle connection structure according to claim 1, characterized in that: The ceramic ring (2) is in the shape of an inverted frustum.

3. The nozzle connection structure according to claim 1 or 2, characterized in that: The connecting portion (11) and the light emitting portion (12) are detachably fixedly connected.

4. The nozzle connection structure according to claim 1 or 2, characterized in that: The conductive high temperature solder paste is GRN360-K2-V solder paste produced by Senju of Japan or CVP-390 solder paste produced by Alpha.

5. The nozzle connection structure according to claim 1 or 2, characterized in that: The material of the metal needle (3) is nickel silver brass.

6. The nozzle connection structure according to claim 1 or 2, characterized in that: The material of the ceramic ring (2) is alumina ceramic with a purity of 99%.

7. The nozzle connection structure according to claim 1 or 2, characterized in that: The material of the metal nozzle (1) is T3 copper.

8. Laser cutting machine, characterized in that, The laser nozzle portion is provided by using the nozzle connection structure as described in any one of claims 1 to 7.

Images