Plasma generating device convenient to adjust

Abstract

The utility model relates to the technical field of metal pulverization, in particular to a plasma generating device convenient to adjust, which comprises a furnace cover, a feeding hole is formed in the furnace cover, a plurality of groups of guide parts penetrating through the side wall of the furnace cover are arranged around the feeding hole, and external threads are arranged on the outer side surfaces of the guide parts; the plasma torch comprises a plasma generator, the plasma generator is sleeved with an installation part, the installation part is of a hollow structure with an opening in the bottom, internal threads are arranged on the inner side face of the installation part, scale marks used for indicating the depth are arranged on the outer side face of the installation part, and the problems that in the prior art, when a plasma torch is subjected to focusing adjustment, consumed time is long, and adjustment is not accurate are solved. And the working efficiency is improved, and the product quality of the finished metal powder is improved.

Description

Technical Field

[0001] The utility model relates to a plasma generating device which is easy to adjust and belongs to the technical field of metal powder making. Background Art

[0002] In daily work, when it is necessary to replace metal wires with different size parameters or after a long period of powder making, it is often necessary to refocus the plasma torch. The utility model patent with publication number CN205414417U discloses a device for preparing high-performance powder for additive manufacturing by plasma atomization. When the plasma torch needs to be focused, it is necessary to focus by pulling out or pushing in the plasma generator, but the adjustment of the plasma generator is often millimeter-level adjustment, and there is no reference for the adjustment distance during adjustment. Adjustment by pulling out and pushing in based on experience alone will lead to inaccurate adjustment and easy over-adjustment. In daily use, the staff needs to adjust and test for nearly a day to achieve a better focusing effect, which seriously affects the work efficiency. In addition, the inaccurate adjustment will also affect the product quality of the finished metal powder. Utility Model Content

[0003] The utility model aims at the deficiencies in the prior art and provides a plasma generating device which is easy to adjust.

[0004] The utility model provides a technical solution to the above technical problems as follows: a plasma generating device that is easy to adjust, comprising: a furnace cover, the furnace cover is provided with a feed port, a plurality of guide parts that penetrate the side wall of the furnace cover are arranged around the feed port, and the outer side surface of the guide part is provided with an external thread; a plasma generator, the plasma generator is sleeved with a mounting part, the mounting part is a hollow structure with an opening at the bottom, the inner side surface of the mounting part is provided with an internal thread, and the mounting part is connected to the guide part by means of internal and external threads.

[0005] Furthermore, a first angle α is formed between the side wall of the furnace cover and the plane where the top surface of the furnace cover is located, and the first angle ranges from 35 to 60 degrees.

[0006] Furthermore, a vertical height H1 from the axis of the contact end of the guide portion with the furnace cover to the plane where the bottom surface of the furnace cover is located is 0.5-0.7 times the vertical height H2 from the axis of the contact end of the feed port with the furnace cover to the plane where the bottom surface of the furnace cover is located.

[0007] Furthermore, the axis of the guide portion and the side wall of the furnace cover have a second angle β, and the second angle ranges from 70 to 90 degrees.

[0008] Furthermore, the guide portion and the plasma generator are each provided with three groups.

[0009] Furthermore, more than two groups of disassembly holes are evenly arranged around the outer surface of the mounting portion.

[0010] Furthermore, the mounting portion is fixedly sleeved on the plasma generator.

[0011] Furthermore, the mounting portion is provided with a limiting hole penetrating through its side wall, the limiting hole is provided with a locking bolt with threaded fit, and one end of the locking bolt passes through the limiting hole and is crimped onto the side wall of the guide portion.

[0012] Furthermore, the inner diameter L of the bottom surface of the furnace cover is 4.5-5.5 times the vertical height H1 from the axis of the contact end of the guide portion and the furnace cover to the plane where the bottom surface of the furnace cover is located.

[0013] Furthermore, the furnace cover is also provided with an observation hole.

[0014] The beneficial effects of the utility model are:

[0015] (1) The utility model solves the problem of time-consuming and inaccurate adjustment when it is necessary to replace metal wires with different quality parameters or adjust the focus of the plasma torch after a long period of powder making. While improving work efficiency, the product quality of the finished metal powder is also improved because the plasma torch can focus more accurately;

[0016] (2) The utility model can ensure the product quality of the finished metal powder and extend the service life of the furnace cover and the plasma generator by limiting the size and angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the plasma generating device of the utility model;

[0018] Figure 2 This is a cross-sectional view of the furnace cover of the utility model;

[0019] Figure 3 This is a front view of the furnace cover of the utility model;

[0020] Figure 4 This is a front view of the plasma generator described in the utility model.

[0021] Figure numerals: 1. furnace cover; 2. feed port; 3. guide part; 4. plasma generator; 5. mounting part; 6. scale line; 7. disassembly hole; 8. locking bolt; 9. observation hole; 10. sealing ring. DETAILED DESCRIPTION

[0022] The following is a detailed description of the specific implementation of the utility model. The utility model can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used are only for describing specific implementations and are not intended to limit the present invention.

[0024] like Figure 1 and 3 As shown, the utility model provides a plasma generating device that is easy to adjust, including a furnace cover 1, the furnace cover 1 is a cone that protrudes upward, and a feed port 2 is vertically arranged at the axis of the furnace cover 1. The feed port 2 and the furnace cover 1 are an integrated structure formed by processing, and can also be connected by welding or the like. The feed port 2 is used to input metal raw material wire, and a plurality of groups of guide parts 3 that penetrate the side wall of the furnace cover 1 are arranged around the feed port 2. The guide part 3 is a hollow cylinder, and the outer side surface of the upper end of the guide part 3 is provided with an external thread; a plasma generator 4, the plasma generator 4 is used to generate a plasma torch, the plasma generator 4 passes through the guide part 3 and extends into the bottom of the furnace cover 1, and a mounting part 5 is sleeved on the plasma generator 4. The cross-section of the mounting part 5 in the embodiment of the utility model is circular, and can also be square or polygonal. The mounting part 5 is a hollow structure with an opening at the bottom, and the inner side surface of the mounting part 5 is provided There is an internal thread, and the mounting portion 5 is connected with the threaded cooperation of the guide portion 3, which can control the depth of the plasma generator 4 extending into the bottom of the furnace cover 1 to focus the plasma torch, and can also play a role in fixing the plasma generator 4. The outer side of the mounting portion 5 is provided with a scale line 6 for indicating the depth. Preferably, the guide portion 3 is provided with three groups, and the three groups of guide portions 3 are all arranged around the axis of the feed port 2, and the angle between adjacent guide portions 3 is 120 degrees. Correspondingly, the plasma generator 4 is also provided with three groups. Through the above arrangement, a larger plasma torch focusing area can be obtained while ensuring the focusing of the plasma torch, which is beneficial to the quality control of the finished powder; the inner surface of the guide portion 3 is provided with a sealing ring 10. After the plasma generator 4 passes through the guide portion 3, the sealing ring 10 contacts the outer side of the plasma generator 4, which not only plays a sealing role, but also plays a guiding and shock-absorbing role.

[0025] Specifically, the mounting portion 5 is fixedly mounted on the plasma generator 4, that is, as the mounting portion 5 rotates, the plasma generator 4 rotates synchronously, and the two may be an integral structure formed by processing, or may be connected by welding or interference fit. By setting the mounting portion 5 to be fixedly mounted on the plasma generator 4, when the focus of the plasma torch is rotated to adjust, the plasma generator 4 rotates synchronously, which can prevent the plasma generator 4 from being heated at the same position all the time during operation, thereby effectively extending the service life of the plasma generator 4.

[0026] Specifically, the side wall of the furnace cover 1 and the plane where the top surface of the furnace cover 1 is located have a first angle α, and the range of the first angle is 35-60 degrees. If the first angle is less than 35 degrees, in order to avoid the plasma torch being too close to the inner side of the top surface of the furnace cover 1, resulting in continuous high-temperature heating of the inner side of the feed port 2 and shortening the service life of the feed port 2, the side wall size of the furnace cover 1 can only be increased, which will cause the structure of the entire atomization powder making system to be not compact and increase the preparation cost of the furnace cover 1. If the first angle is greater than 60 degrees, although the inner side of the feed port 2 will not be continuously heated at high temperature at this time, the distance from the metal raw material wire to the focus of the plasma torch through the feed port 2 will also be correspondingly increased, causing the metal raw material wire to produce unnecessary shaking when melting, resulting in difficulty in fully utilizing the focus of the plasma torch to melt the wire, resulting in the final metal powder having low sphericity and coarse particle size, low production efficiency, and is not conducive to the quality control of the finished metal powder.

[0027] Specifically, the vertical height H1 of the axis of the contact end between the guide portion 3 and the furnace cover 1 to the plane where the bottom surface of the furnace cover 1 is located is 0.5-0.7 times the vertical height H2 of the axis of the contact end between the feed port 2 and the furnace cover 1 to the plane where the bottom surface of the furnace cover 1 is located. If the height ratio is less than 0.5, the vertical spacing between the plane where the guide portion 3 is located and the plane where the feed port 2 is located is too large, making the furnace cover 1 too high, which not only increases the preparation cost of the furnace cover 1, but also affects the system stability during the working process. In addition, the vertical spacing is too large, which makes the metal When the raw material wire is melted, it will produce unnecessary shaking, which makes it difficult to fully utilize the focus of the plasma torch to melt the wire, which is not conducive to the quality control of the finished powder. If the height ratio is greater than 0.7, although the size of the furnace cover 1 is controlled, the plasma torch is too close to the inner side of the top surface of the furnace cover 1. Continuous high-temperature heating of the inner side of the feed port 2 will shorten the service life of the feed port 2. Because the furnace cover 1 is a cone, it is impossible to use a plasma generator 4 with a larger length specification to solve the problem of continuous heating of the inner side of the feed port 2. Therefore, only when the height ratio is 0.5-0.7 times, the stability of the entire atomization powder making system is high during operation, and the quality of the finished powder can be controlled.

[0028] Specifically, the guide portion 3 and the side wall of the furnace cover 1 have a second angle β, and the second angle range is 70-90 degrees. The setting of the above angle range is very important. If the second angle is less than 70 degrees, the plasma generator 4 is too tilted downward. When focusing the plasma torch, a plasma generator 4 with a larger length specification is required to achieve a good focusing effect. However, a plasma generator 4 with a larger length specification increases the manufacturing difficulty and increases the production and operation costs. In addition, the use of a plasma generator 4 with a larger length specification will also produce greater shear stress on the guide portion 3, and the corresponding atomization chamber that requires a larger space for atomization makes the overall system less compact. If the second angle is greater than 90 degrees, when atomization powder making is performed, the plasma generator 4 is close to parallel to the plane where the top surface of the furnace cover 1 is located. Because the plasma torch extends from the axial direction of the plasma generator 4, the plasma The sub-torches are also close to parallel, and the utilization rate of the plasma torch is low, which makes the metal melt low in superheat, resulting in low sphericity and coarse particle size of the metal powder finally produced. In addition, when the spacing between the ends of the plasma generator 4 is the same, the plasma torch will continue to heat the ends of other plasma generators 4 while melting the metal wire, which will have a certain impact on the service life of the plasma generator 4. Only when the second angle β is in the range of 70-90 degrees, the overall system structure is compact, the focusing effect is good, and the utilization rate of the plasma torch is high. After the metal raw material wire is melted through the focus of the plasma torch, the melt droplets move downward. At this time, the time for the melt droplets to pass through the plasma torch is longer than the time when the plasma generator 4 is close to parallel. The melt droplets have a larger superheat, and the surface tension and viscosity of the melt droplets are correspondingly reduced, which can ensure that the finished metal powder has high sphericity, fine and uniform particle size.

[0029] Specifically, more than two disassembly holes 7 are arranged around the outer surface of the mounting portion 5, and the disassembly holes 7 are evenly distributed on the same virtual circumference of the outer surface of the mounting portion 5. The claws of the disassembly tool are placed in the disassembly holes 7, and the plasma generator 4 can be more conveniently adjusted or disassembled by the disassembly tool. Preferably, the cross-section of the disassembly hole 7 is circular, and four groups of disassembly holes 7 are evenly arranged around the outer surface of the mounting portion 5, so that the force is more uniform and the operation is more convenient during adjustment or disassembly; a limiting hole penetrating the side wall of the mounting portion 5 is arranged at the lower part of the mounting portion 5, and the lower part referred to here is the mounting portion The end of the mounting portion 5 is close to the bottom surface of the furnace cover 1, the axis of the limiting hole is parallel to the normal of the side wall of the mounting portion 5, and the limiting hole is provided with a locking bolt 8 with threaded fitting, and one end of the locking bolt 8 is crimped onto the side wall of the guide portion 3 after passing through the limiting hole. When the focusing is completed, the locking bolt 8 is used to fix the position of the plasma generator 4 relative to the guide portion 3, which can ensure the stability of the plasma generator 4 during operation and the quality of the finished metal powder, and can also avoid the problem of improper operation and adjustment of the plasma generator 4 affecting the work efficiency after the plasma torch focusing is completed.

[0030] Specifically, the inner diameter L of the bottom surface of the furnace cover 1 is 4.5-5.5 times the vertical height H1 from the axis of the contact end of the guide portion 3 and the furnace cover 1 to the plane where the bottom surface of the furnace cover 1 is located. When the inner diameter L of the bottom surface of the furnace cover 1 is less than 4.5 times the vertical height H1, the working space used for melting and vacuum atomization is too small, which is not conducive to improving production efficiency. In addition, when the working space is too small, more metal melt droplets are blown to the inner wall of the working space during the atomization of high-pressure inert gas, which will affect the quality of the finished metal powder and generate working noise. When the inner diameter L of the bottom surface of the furnace cover 1 is greater than 5.5 times the vertical height H1, the size of the furnace cover 1 is too large, making the overall structure not compact enough and the preparation cost of the furnace cover 1 higher. In addition, as the size increases, the corresponding internal working space becomes larger, and more inert gas is required during powder making, resulting in an increase in production and operation costs.

[0031] Specifically, observation holes 9 for observing the working conditions are provided between adjacent guide parts 3 on the furnace cover 1, so as to adjust the plasma generator 4 according to the working conditions at any time.

[0032] Table 1 is a comparison table of the quality and parameters of various sizes of the embodiments and comparative examples of the utility model;

[0033] parameter Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 H1 45 45 45 45 45 H2 90 75 64 112 56 L 202 225 247 157 292 The first angle α 35 45 60 25 70 The second angle β 70 80 90 60 100 Particle size thin thin thin middle thick Equipment life long long long long short Sphericity high high high Low Low

[0034] Table 1

[0035] It can be seen from the evaluation results of Example 1, Example 2, and Example 3 that when the first angle α is in the range of 35-60 degrees, the second angle β is in the range of 70-90 degrees, the height H1 is 0.5-0.7 times the height H2, and the inner diameter L of the bottom surface of the furnace cover 1 is 4.5-5.5 times the height H1, the quality of the finished metal powder can be ensured and the service life of the furnace cover 1 and the plasma generator 4 can be extended; when the size parameters of Example 1 are used, although the service life of the equipment is extended, it is precisely because of the extended service life of the equipment that the overall size of the furnace cover 1 is large, which increases the preparation cost and causes the structure of the entire atomization powder making system to be not compact, and the sphericity of the finished metal powder produced is low. When the size parameters of Example 2 are used, the plasma torch will continue to heat the ends of other plasma generators 4 and the inner side of the feeding port 2 while melting the metal wire, resulting in a short service life of the equipment, and the particle size of the finished metal powder is coarse and the sphericity is low, which seriously affects the quality control of the finished metal powder.

[0036] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] For ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. The protection scope of the utility model shall be based on the attached claims.

Claims

1. A plasma generating device that is easy to adjust, characterized in that: include: A furnace cover, wherein a feed port is arranged on the furnace cover, and a plurality of guide portions penetrating the side wall of the furnace cover are arranged around the feed port, and an external thread is arranged on the outer side surface of the guide portion; A plasma generator is provided with a mounting portion, the mounting portion is a hollow structure with an opening at the bottom, an inner side surface of the mounting portion is provided with an internal thread, and the mounting portion is connected with the guide portion through internal and external threads.

2. The plasma generating device according to claim 1, characterized in that: The side wall of the furnace cover and the plane where the top surface of the furnace cover is located have a first angle α, and the range of the first angle is 35-60 degrees.

3. The easily adjustable plasma generating device according to claim 2, characterized in that: The vertical height H1 from the axis of the contact end of the guide portion with the furnace cover to the plane where the bottom surface of the furnace cover is located is 0.5-0.7 times the vertical height H2 from the axis of the contact end of the feed port with the furnace cover to the plane where the bottom surface of the furnace cover is located.

4. The easily adjustable plasma generating device according to claim 2, characterized in that: The axis of the guide portion and the side wall of the furnace cover have a second angle β, and the second angle ranges from 70 to 90 degrees.

5. The easily adjustable plasma generating device according to claim 1, characterized in that: The guide part and the plasma generator are both provided with three groups.

6. The easily adjustable plasma generating device according to claim 5, characterized in that: More than two groups of disassembly holes are evenly arranged around the outer surface of the mounting portion.

7. The easily adjustable plasma generating device according to claim 5, characterized in that: The mounting part is fixedly sleeved on the plasma generator.

8. The easily adjustable plasma generating device according to claim 1, characterized in that: The mounting portion is provided with a limiting hole penetrating through its side wall, wherein a locking bolt with threaded fit is provided in the limiting hole, and one end of the locking bolt passes through the limiting hole and is crimped onto the side wall of the guide portion.

9. The easily adjustable plasma generating device according to claim 1, characterized in that: The inner diameter L of the bottom surface of the furnace cover is 4.5-5.5 times the vertical height H1 from the axis of the contact end of the guide portion and the furnace cover to the plane where the bottom surface of the furnace cover is located.

10. The easily adjustable plasma generating device according to claim 1, characterized in that: The furnace cover is also provided with an observation hole.

Images