Electrode for plasma cutting torch

Abstract

The utility model relates to an electrode for a plasma cutting torch, which belongs to the technical field of electrodes for cutting torches and comprises an electrode base body and an electrode emitter, two ends of the electrode base body are distributed up and down, a mounting hole is arranged at the lower end of the electrode base body and is a blind hole, the electrode emitter is positioned in the mounting hole, and the electrode emitter is positioned in the electrode base body. The electrode emitter is fixedly connected with the inner wall of the mounting hole, the lower end of the electrode base body and the lower end of the electrode emitter are located on the same plane, and the inner wall of the mounting hole supports the electrode emitter upwards; the electrode emitter comprises an inserting part and a limiting part, the inserting part and the limiting part are distributed up and down, the electrode emitter is supported upwards through the inner wall of the mounting hole, the electrode emitter is prevented from falling off from the mounting hole, the reliability of connection between the electrode base body and the electrode emitter is improved, and in addition, the inserting rod is arranged, so that the electrode emitter can be inserted into the mounting hole, and the reliability of the electrode emitter is improved. And the heat dissipation efficiency of the electrode emitter is improved.

Description

Technical Field

[0001] This utility model relates to an electrode for a plasma cutting torch, belonging to the technical field of electrodes for cutting torches. Background Technology

[0002] Plasma cutting is a novel material cutting process that uses a high-temperature, high-speed plasma arc as a heat source to heat and melt the material being cut. When the arc column and high-speed gas flow pass through the nozzle orifice of the torch, the arc is compressed, increasing the concentration of heat energy and locally melting the material being cut. Simultaneously, the high-speed gas flow blows away the molten material, creating a narrow kerf and completing the cutting operation. The plasma electrode is used to ionize the gas and release electrical charges. Once this process is complete, the gas becomes conductive and capable of carrying current, thus forming plasma.

[0003] Utility model patent CN201320125407.8 discloses an electrode for a plasma cutting torch, comprising a copper substrate and a hafnium electrode emitter. The copper substrate has a "mountain"-shaped cross-section and an annular groove at its bottom. The hafnium electrode emitter is annular and disposed within the annular groove of the copper substrate. This utility model features low intermittent resistance, high electrode emitter cooling efficiency, and long service life. However, in the prior art, the hafnium electrode emitter is welded to the annular groove of the copper substrate using silver alloy brazing flux. The copper substrate and the hafnium electrode emitter have different coefficients of thermal expansion; copper has a coefficient of thermal expansion of 17.5, while hafnium has a coefficient of thermal expansion of 5.8. During operation, the volume changes of the copper substrate and the hafnium electrode emitter after thermal expansion are different. After cooling, the welded area between the hafnium electrode emitter and the annular groove of the copper substrate is prone to delamination, leading to the detachment of the hafnium electrode emitter.

[0004] Therefore, there is a need for an electrode for plasma cutting torches to improve the reliability of the connection between the copper substrate and the hafnium electrode emitter and prevent the hafnium electrode emitter from detaching. Utility Model Content

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, to provide an electrode for plasma cutting torch that improves the reliability of the connection between the copper substrate and the hafnium electrode emitter and prevents the hafnium electrode emitter from falling off.

[0006] The utility model discloses a technical scheme that solves the above problems is adopted: a kind of electrode for plasma cutting torch, including electrode base body and electrode emitter, the lower end of the electrode base body is distributed up and down, the lower end of the electrode base body is provided with mounting hole, the mounting hole is blind hole, the electrode emitter is located in mounting hole, the inner wall of the electrode emitter and mounting hole is fixedly connected, the lower end of the electrode base body and the lower end of the electrode emitter are in the same plane, the inner wall of the mounting hole realizes the support of electrode emitter upward;

[0007] The electrode emitter includes a plug-in part and a limiting part, which are distributed up and down. The projection of the limiting part along the length direction of the electrode emitter is located within the projection of the plug-in part along the length direction of the electrode emitter.

[0008] The mounting hole includes a first hole segment and a second hole segment. The first hole segment corresponds to and matches the cylindrical segment. The second hole segment corresponds to and matches the circular truncated cone segment.

[0009] As a preference, the plug-in part is cylindrical, the limiting part is circular truncated cone-shaped, the plug-in part and the limiting part are coaxially arranged, the large end of the limiting part is connected to the lower end of the plug-in part, the diameter of the large end of the limiting part is less than or equal to the diameter of the plug-in part, and the inner wall of the second hole segment is in contact with the conical surface of the limiting part.

[0010] As a preference, the plug-in part is prismatic, the limiting part is prismatic, the plug-in part and the limiting part are coaxially arranged, the large end of the limiting part is connected to the lower end of the plug-in part, the large end of the limiting part matches the lower end of the plug-in part, and the inner wall of the second hole segment is in contact with the inclined surface of the limiting part.

[0011] As a preference, the plug-in part is cylindrical, the limiting part is prismatic, the plug-in part and the limiting part are coaxially arranged, the large end of the limiting part is connected to the lower end of the plug-in part, and the inner wall of the second hole segment is in contact with the inclined surface of the limiting part.

[0012] As a preference, the plug-in part and the limiting part are both cylindrical, the plug-in part and the limiting part are coaxially arranged, the diameter of the plug-in part is greater than the diameter of the limiting part, and the bottom in the first hole segment is in contact with the bottom of the plug-in part.

[0013] As a preference, a plug rod is arranged in the mounting hole, the plug rod is parallel to the electrode emitter, an assembly hole is arranged on the electrode emitter, the assembly hole matches the plug rod, the plug rod passes through the assembly hole, the plug rod is in contact with the inner wall of the assembly hole, and the lower end of the plug rod is in the same plane as the lower end of the electrode base body.

[0014] As preferred, the bottom end of the inserting rod is provided with a first air hole, the first air hole is a blind hole, the first air hole extends upwardly into the electrode base body, the inner wall of the first air hole is provided with a second air hole, the second air hole extends to the outer wall of the electrode base body.

[0015] As preferred, the second air hole is arranged obliquely, the end of the second air hole away from the first air hole is above the other end of the second air hole.

[0016] As preferred, the outer wall of the electrode base body is provided with a flange, the flange is below the end of the second air hole away from the first air hole.

[0017] As preferred, the material of the electrode base body is copper, and the material of the electrode emitter is hafnium.

[0018] Compared with the prior art, the electrode for plasma cutting torch has the following advantages:

[0019] The electrode for plasma cutting torch has the following advantages: the inner wall of the mounting hole supports the electrode emitter upwardly, so that the electrode emitter is prevented from falling off from the mounting hole, the reliability of the connection between the electrode base body and the electrode emitter is improved, the heat dissipation efficiency of the electrode emitter is improved by the inserting rod, the heat on the electrode emitter is transferred to the inserting rod and then discharged with the air flow when the air passes through the second air hole and the first air hole in sequence, and the heat dissipation efficiency of the electrode emitter is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the electrode for plasma cutting torch;

[0021] Figure 2 It is a front view of the electrode for plasma cutting torch;

[0022] Figure 3 It is a left view of the electrode for plasma cutting torch;

[0023] Figure 4 It is a bottom view of the electrode for plasma cutting torch;

[0024] Figure 5 It is a sectional view of the electrode for plasma cutting torch;

[0025] Figure 6 It is an enlarged view of A part of Figure 5

[0026] Figure 7 It is a sectional view of the electrode base body;

[0027] Figure 8 It is a perspective view of the electrode emitter;​

[0028] Figure 9 This is a cross-sectional view of the electrode emitter.

[0029] in:

[0030] Electrode substrate 1, electrode emitter 2, mounting hole 3, insertion rod 4, assembly hole 5, first vent 6, second vent 7, flange 8;

[0031] Plug-in part 21, limiting part 22;

[0032] First hole section 31, second hole section 32. Detailed Implementation

[0033] like Figures 1-9 As shown, an electrode for a plasma cutting torch in this embodiment includes an electrode substrate 1 and an electrode emitter 2. The electrode substrate 1 has two ends distributed vertically. The lower end of the electrode substrate 1 is provided with a mounting hole 3, which is a blind hole. The electrode emitter 2 is located inside the mounting hole 3. The electrode emitter 2 is fixedly connected to the inner wall of the mounting hole 3 by welding. The electrode substrate 1 is made of copper, and the electrode emitter 2 is made of hafnium. The lower ends of the electrode substrate 1 and the lower ends of the electrode emitter 2 are on the same plane. The inner wall of the mounting hole 3 provides upward support for the electrode emitter 2.

[0034] The electrode emitter 2 includes a plug-in portion 21 and a limiting portion 22, which are distributed vertically. The projection of the limiting portion 22 along the length direction of the electrode emitter 2 is located within the projection of the plug-in portion 21 along the length direction of the electrode emitter 2.

[0035] The mounting hole 3 includes a first hole segment 31 and a second hole segment 32. The first hole segment 31 corresponds to and matches the cylindrical segment, and the second hole segment 32 corresponds to and matches the frustum segment.

[0036] The insertion part 21 is cylindrical, and the limiting part 22 is frustum-shaped. The insertion part 21 and the limiting part 22 are arranged coaxially. The large end of the limiting part 22 is connected to the lower end of the insertion part 21. The diameter of the large end of the limiting part 22 is less than or equal to the diameter of the insertion part 21. The inner wall of the second hole section 32 is in contact with the conical surface of the limiting part 22. When the electrode emitter 2 and the electrode substrate 1 are delaminated due to thermal expansion, the limiting part 22 is supported by the inner wall of the second hole section 32, which can prevent the electrode emitter 2 from falling out of the mounting hole 3 and improve the reliability of the connection between the electrode substrate 1 and the electrode emitter 2.

[0037] Of course, the plug-in part 21 can also be prismatic, the limiting part 22 is a truncated pyramid, the plug-in part 21 and the limiting part 22 are coaxially arranged, the large end of the limiting part 22 is connected with the lower end of the plug-in part 21, and the large end of the limiting part 22 matches the lower end of the plug-in part 21. The plug-in part 21 of the prismatic shape can be a quadrangular prism, a pentagonal prism, etc., and the limiting part 22 of the truncated pyramid shape can be a corresponding quadrangular truncated pyramid, a pentagonal truncated pyramid, etc. The inner wall of the second hole section 32 is in close contact with the inclined surface of the limiting part 22. When delamination occurs between the electrode emitter 2 and the electrode base body 1 due to thermal expansion, the limiting part 22 is supported by the inner wall of the second hole section 32, so that the electrode emitter 2 can be prevented from falling out of the mounting hole 3, and the reliability of the connection between the electrode base body 1 and the electrode emitter 2 is improved.

[0038] In addition, the plug-in part 21 can also be cylindrical, the limiting part 22 is a truncated pyramid, the plug-in part 21 and the limiting part 22 are coaxially arranged, the large end of the limiting part 22 is connected with the lower end of the plug-in part 21, and the large end of the limiting part 22 matches the lower end of the plug-in part 21. The limiting part 22 of the truncated pyramid shape can be a corresponding quadrangular truncated pyramid, a pentagonal truncated pyramid, etc. The inner wall of the second hole section 32 is in close contact with the inclined surface of the limiting part 22. When delamination occurs between the electrode emitter 2 and the electrode base body 1 due to thermal expansion, the limiting part 22 is supported by the inner wall of the second hole section 32, so that the electrode emitter 2 can be prevented from falling out of the mounting hole 3, and the reliability of the connection between the electrode base body 1 and the electrode emitter 2 is improved.

[0039] Secondly, the plug-in part 21 and the limiting part 22 can both be cylindrical, the plug-in part 21 and the limiting part 22 are coaxially arranged, the diameter of the plug-in part 21 is greater than the diameter of the limiting part 22, and the bottom of the first hole section 31 is in close contact with the bottom of the plug-in part 21. When delamination occurs between the electrode emitter 2 and the electrode base body 1 due to thermal expansion, the plug-in part 21 is supported by the bottom of the first hole section 31, so that the electrode emitter 2 can be prevented from falling out of the mounting hole 3, and the reliability of the connection between the electrode base body 1 and the electrode emitter 2 is improved.

[0040] In addition, the plug-in part 21 can also be cylindrical, the limiting part 22 is a truncated pyramid, the plug-in part 21 and the limiting part 22 are coaxially arranged, the large end of the limiting part 22 is connected with the lower end of the plug-in part 21, and the large end of the limiting part 22 matches the lower end of the plug-in part 21. The limiting part 22 of the truncated pyramid shape can be a corresponding quadrangular truncated pyramid, a pentagonal truncated pyramid, etc. The inner wall of the second hole section 32 is in close contact with the inclined surface of the limiting part 22. When delamination occurs between the electrode emitter 2 and the electrode base body 1 due to thermal expansion, the limiting part 22 is supported by the inner wall of the second hole section 32, so that the electrode emitter 2 can be prevented from falling out of the mounting hole 3, and the reliability of the connection between the electrode base body 1 and the electrode emitter 2 is improved.

[0041] The installation hole 3 is provided with a plug rod 4, the plug rod 4 is parallel to the electrode emitter 2, the electrode emitter 2 is provided with an assembly hole 5, the assembly hole 5 is matched with the plug rod 4, the plug rod 4 passes through the assembly hole 5, the plug rod 4 is attached to the inner wall of the assembly hole 5, the lower end of the plug rod 4 is in the same plane with the lower end of the electrode base 1, the contact area of the electrode emitter 2 and the electrode base 1 is increased by the plug rod 4, the heat dissipation speed of the electrode emitter 2 is improved, the melting and burning loss speed of the electrode emitter 2 is reduced, so that the service life of the electrode is prolonged;

[0042] The bottom end of the plug rod 4 is provided with a first air hole 6, the first air hole 6 is a blind hole, the first air hole 6 extends upwards into the electrode base 1, a plurality of second air holes 7 are arranged on the inner wall of the first air hole 6, the plurality of second air holes 7 are uniformly distributed in the circumferential direction with the first air hole 6 as the center, and the second air holes 7 extend to the outer side wall of the electrode base 1; during work, the air on the outer wall of the electrode base 1 passes through the second air holes 7 and the first air hole 6 in turn, so that the heat on the electrode emitter 2 is transferred to the plug rod 4 and then discharged with the airflow, and the heat dissipation efficiency of the electrode emitter 2 is improved;

[0043] The second air hole 7 is arranged obliquely, and the end of the second air hole 7 away from the first air hole 6 is located above the other end of the second air hole 7;

[0044] The outer wall of the electrode base 1 is provided with a flange 8, the flange 8 is located below the end of the second air hole 7 away from the first air hole 6, and during the downward flow of the air outside the electrode base 1, part of the air moves horizontally and enters the second air after being impacted on the flange 8, thereby improving the reliability of the airflow through the second air;

[0045] In summary, the inner wall of the installation hole 3 supports the electrode emitter 2 upwards, avoids the electrode emitter 2 from falling out of the installation hole 3, and improves the reliability of the connection between the electrode base 1 and the electrode emitter 2, and by arranging the plug rod 4, the heat dissipation efficiency of the electrode emitter 2 is improved, and in addition, by arranging the first air hole 6 and the second air hole 7, when the air passes through the second air hole 7 and the first air hole 6 in turn, the heat on the electrode emitter 2 is transferred to the plug rod 4 and then discharged with the airflow, thereby further improving the heat dissipation efficiency of the electrode emitter 2.

[0046] In addition to the above-mentioned embodiments, the utility model also includes other implementation manners, and any technical scheme formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the utility model claim.

Claims

1. A kind of electrode for plasma cutting torch, including electrode base body (1) and electrode projectile (2), the lower end of the electrode base body (1) is distributed on two ends, the lower end of the electrode base body (1) is provided with mounting hole (3), the mounting hole (3) is blind hole, the electrode projectile (2) is located in mounting hole (3), the electrode projectile (2) is fixedly connected with the inner wall of mounting hole (3), the lower end of the electrode base body (1) and the lower end of electrode projectile (2) are in the same plane, it is characterized by: The inner wall of the mounting hole (3) supports the electrode emitter (2) upward; The electrode emitter (2) comprises a plug-in part (21) and a limiting part (22), the plug-in part (21) and the limiting part (22) are distributed up and down, and the projection of the limiting part (22) along the length direction of the electrode emitter (2) is located in the projection of the plug-in part (21) along the length direction of the electrode emitter (2). The mounting hole (3) comprises a first hole section (31) and a second hole section (32), the first hole section (31) corresponds and matches the cylindrical section, and the second hole section (32) corresponds and matches the circular truncated cone section.

2. The electrode for a plasma cutting torch according to claim 1, wherein: The plug-in part (21) is cylindrical, the limiting part (22) is circular truncated cone-shaped, the plug-in part (21) and the limiting part (22) are coaxially arranged, the large end of the limiting part (22) is connected with the lower end of the plug-in part (21), the diameter of the large end of the limiting part (22) is less than or equal to the diameter of the plug-in part (21), and the inner wall of the second hole section (32) is attached to the conical surface of the limiting part (22).

3. The electrode for a plasma cutting torch of claim 1, wherein: The plug-in part (21) is prismatic, the limiting part (22) is prismatic, the plug-in part (21) and the limiting part (22) are coaxially arranged, the large end of the limiting part (22) is connected with the lower end of the plug-in part (21), the large end of the limiting part (22) matches the lower end of the plug-in part (21), and the inner wall of the second hole section (32) is attached to the inclined surface of the limiting part (22).

4. The electrode for a plasma cutting torch of claim 1 wherein: The plug-in part (21) is cylindrical, the limiting part (22) is prismatic, the plug-in part (21) and the limiting part (22) are coaxially arranged, the large end of the limiting part (22) is connected with the lower end of the plug-in part (21), and the inner wall of the second hole section (32) is attached to the inclined surface of the limiting part (22).

5. The electrode for a plasma cutting torch of claim 1 wherein: The plug-in part (21) and the limiting part (22) are both cylindrical, the plug-in part (21) and the limiting part (22) are coaxially arranged, the diameter of the plug-in part (21) is greater than the diameter of the limiting part (22), and the bottom in the first hole section (31) is attached to the bottom of the plug-in part (21).

6. The electrode for a plasma cutting torch of claim 1 wherein: A plug rod (4) is arranged in the mounting hole (3), the plug rod (4) is parallel to the electrode emitter (2), an assembly hole (5) is arranged on the electrode emitter (2), the assembly hole (5) matches the plug rod (4), the plug rod (4) passes through the assembly hole (5), the plug rod (4) is attached to the inner wall of the assembly hole (5), and the lower end of the plug rod (4) is in the same plane as the lower end of the electrode base body (1).

7. The electrode for a plasma cutting torch of claim 1 wherein: A first air hole (6) is arranged at the bottom end of the plug rod (4), the first air hole (6) is a blind hole, the first air hole (6) extends upward into the electrode base body (1), a second air hole (7) is arranged on the inner wall of the first air hole (6), and the second air hole (7) extends to the outer side wall of the electrode base body (1).

8. The electrode for a plasma cutting torch of claim 7, wherein: The second air hole (7) is arranged obliquely, and the end of the second air hole (7) away from the first air hole (6) is located above the other end of the second air hole (7).

9. An electrode for a plasma torch according to claim 7 or 8, characterized in that: The outer wall of the electrode base body (1) is provided with a flange (8) located below the end of the second air hole (7) away from the first air hole (6).

10. The electrode for a plasma cutting torch of claim 1 wherein: The material of the electrode base body (1) is copper, and the material of the electrode emitter (2) is hafnium.

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