Ignition device for improving vacuum discharge of graphite heating body in samarium-cobalt sintering furnace

Abstract

The utility model discloses a device for improving vacuum discharge ignition of a graphite heating body in a samarium cobalt sintering furnace, which relates to the technical field of rare earth permanent magnet material production equipment and comprises a graphite inner container, an electrode hole is arranged on the bottom side of the graphite inner container, and an electrode main body is sleeved between the inner walls of the electrode hole. The outer edge of the end, back on to the graphite inner container, of the electrode body is fixedly sleeved with a plurality of circles of ceramic pieces, and one side of the graphite inner container is sleeved with a supporting threaded rod. Through the arrangement of the supporting threaded rod made of ceramic, it is guaranteed that the graphite heating rod and the graphite support of the inner container of the sintering furnace are in an insulated state, so that short circuit of the graphite heating rod and the inner container is prevented, and the problem of discharge sparking between the graphite heating rod and the inner container is solved; meanwhile, due to the arrangement of the ceramic chips, metal elements evaporated at high temperature are prevented from being attached to the joint of the electrode and the inner container, the insulation characteristic of the graphite electrode and the inner container of the sintering furnace is guaranteed, and the problem of discharge sparking between the graphite electrode and the inner container of the sintering furnace is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rare earth permanent magnet material production equipment, in particular to a device for improving the vacuum discharge ignition of a graphite heating body in a samarium-cobalt sintering furnace. Background Art

[0002] 2:17 SmCo permanent magnets are manufactured using traditional powder metallurgy methods. The main production steps include batching, vacuum induction melting, powder preparation, molding, sintering, and aging. The sintering process is a key step in the production of 2:17 SmCo permanent magnets. The green body, after cold isostatic pressing, is placed in a vacuum sintering furnace. After low-temperature and medium-temperature degassing, the green body is sintered at approximately 1200 degrees Celsius into a high-density, high-strength magnet with a specific phase structure. Existing vacuum sintering furnaces have at least the following defects in use:

[0003] In actual use, 2:17 SmCo permanent magnet material is mainly composed of five elements: samarium, cobalt, copper, iron, and zirconium. The melting point of metal samarium is only 1072 degrees Celsius and it is volatile. During the high-temperature sintering process in the vacuum sintering furnace, it is easy to evaporate and then condense in the lower temperature area of ​​the sintering furnace, usually condensing at the sintering furnace electrode or the graphite support of the sintering furnace liner. The condensed metal samarium will cause the graphite heating body to short-circuit with the sintering furnace liner. When the graphite heating body of the sintering furnace is heated by electricity, it is easy to discharge in the vacuum state. Fire phenomenon, the temperature of discharge ignition exceeds 1700 degrees Celsius, which will damage the sintering furnace liner, graphite electrodes, and graphite supports, making the sintering furnace unusable; at the same time, frequent ignition discharges will cause uneven temperature inside the sintering furnace, and the 2:17 samarium cobalt permanent magnet material is extremely sensitive to temperature during high-temperature sintering. The uneven temperature will lead to uneven final magnetic properties of the material, thereby affecting the consistency of the final product quality. Therefore, a vacuum discharge ignition device for improving the graphite heating body in the samarium cobalt sintering furnace is developed. Utility Model Content

[0004] The main purpose of the utility model is to provide a vacuum discharge ignition device for improving the graphite heating body in a samarium-cobalt sintering furnace, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A vacuum discharge ignition device for improving a graphite heating body in a samarium-cobalt sintering furnace comprises a graphite inner liner, an electrode hole is provided on the bottom side of the graphite inner liner, an electrode body is sleeved between the inner walls of the electrode hole, a plurality of circles of ceramic sheets are fixedly sleeved on the outer edge of one end of the electrode body facing away from the graphite inner liner, a support hole is provided on one side of the graphite inner liner, a support threaded rod is sleeved between the inner walls of the support hole, a graphite heating rod is screwed to one end of the support threaded rod, and the other end of the graphite heating rod is in contact with the electrode body.

[0007] Preferably, an electrode head is fixedly connected to one end of the electrode body facing the interior of the graphite liner, and the electrode head and one end of the graphite heating rod are in contact with each other.

[0008] Preferably, a circle of sealing gasket is fixedly connected to the outer edge of the electrode body, the outer edge of the sealing gasket contacts the inner wall of the electrode hole, and the side of the sealing gasket facing away from the graphite liner contacts the ceramic sheet.

[0009] Preferably, an electrode connecting seat is provided at one end of the electrode body facing away from the electrode body, a plurality of clamping connecting rods are fixedly connected to the bottom side of the electrode body, an electrode clamping sleeve is fixedly connected to the bottom end of the clamping connecting rod, and the inner walls on both sides of the electrode clamping sleeve are in contact with the outer edge of the electrode connecting seat.

[0010] Preferably, a graphite support seat is fixedly connected to one side of the graphite liner, a connecting plate is fixedly connected to the top side of the graphite support seat, a supporting body is fixedly connected to the top side of the connecting plate, and a supporting outer frame is fixedly connected to the top side of the supporting body.

[0011] Preferably, the inner wall of the supporting outer frame and the supporting threaded rod are sleeved with each other, a circle of protective gasket is provided at the connection between the supporting threaded rod and the supporting outer frame, and the supporting threaded rod is a threaded rod made of ceramic material.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The utility model ensures that the graphite heating rod and the graphite support of the sintering furnace liner are insulated by the setting of the supporting threaded rod made of ceramic, thereby preventing the short circuit between the graphite heating rod and the liner, and thus solving the problem of discharge and ignition between the two;

[0014] 2. The utility model prevents high-temperature evaporated metal elements from adhering to the joints between the electrode and the inner tank by setting up multiple ceramic sheets, thereby ensuring the insulation properties of the graphite electrode and the inner tank of the sintering furnace and solving the problem of discharge and sparking between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is an isometric view of the present utility model;

[0016] Figure 2 This is a schematic diagram of the graphite liner structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the graphite electrode structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the graphite support structure of the present utility model.

[0019] In the figure: 101, sealing door; 102, graphite liner; 103, graphite support seat; 104, electrode clamping sleeve; 105, clamping connecting rod; 201, electrode connecting seat; 202, ceramic sheet; 203, electrode head; 204, electrode body; 205, sealing gasket; 301, connecting seat; 302, support body; 303, support outer frame; 304, protective gasket; 305, support threaded rod. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0023] See also Figures 1-4 , the utility model provides a technical solution:

[0024] A vacuum discharge ignition device for improving the graphite heating element in a samarium-cobalt sintering furnace comprises a graphite inner liner 102, a sealed door 101 disposed on the outside of the graphite inner liner 102, an electrode hole defined on the bottom side of the graphite inner liner 102, an electrode body 204 sleeved between the inner walls of the electrode hole, and a plurality of coils of ceramic sheets 202 fixedly sleeved on the outer edge of the end of the electrode body 204 facing away from the graphite inner liner 102. A support hole defined on one side of the graphite inner liner 102, a support threaded rod 305 sleeved between the inner walls of the support hole, a graphite heating rod screwed to one end of the support threaded rod 305, and the other end of the graphite heating rod in contact with the electrode body 204. An electrode head 203 is fixedly connected to the end of the electrode body 204 facing the interior of the graphite inner liner 102, and the electrode head 203 and one end of the graphite heating rod in contact with each other. A sealing gasket 205 is fixedly connected to the outer edge of the electrode body 204. The outer edge of the sealing gasket 205 contacts the inner wall of the electrode hole, and the side of the sealing gasket 205 facing away from the graphite liner 102 contacts the ceramic sheet 202. An electrode connection seat 201 is provided at the end of the electrode body 204 facing away from the electrode body 204. Multiple clamping connecting rods 105 are fixedly connected to the bottom side of the electrode body 204. The bottom end of the clamping connecting rod 105 is fixedly connected to an electrode clamping sleeve 104, and the inner walls of both sides of the electrode clamping sleeve 104 contact the outer edge of the electrode connection seat 201. It should be noted that the heating material of the sintering furnace dedicated to 2:17 samarium cobalt permanent magnet material is round rod-shaped graphite material, and the electrode is also graphite material. The traditional practice is to use ceramic parts to isolate the contact area between the graphite electrode and the sintering furnace inner tank to achieve an insulation effect. In fact, since metal samarium is easily attached to this area, it is easy to destroy the insulation properties and cause discharge and sparking. In this embodiment, the entire traditional ceramic part is replaced with three to five ceramic sheets 202 with characteristic shapes. The raw material is boron nitride, and there are grooves between the ceramic sheets 202. Metal samarium is extremely difficult to adhere to it, which ensures the insulation properties of the graphite electrode and the sintering furnace inner tank and solves the problem of discharge and sparking between the two.

[0025] A graphite support seat 103 is fixedly connected to one side of the graphite inner liner 102. A connecting plate 301 is fixedly connected to the top side of the graphite support seat 103. A supporting body 302 is fixedly connected to the top side of the connecting plate 301. A supporting outer frame 303 is fixedly connected to the top side of the supporting body 302. The inner wall of the supporting outer frame 303 and the supporting threaded rod 305 are mutually socketed. A circle of protective gasket 304 is provided at the connection between the supporting threaded rod 305 and the supporting outer frame 303. The supporting threaded rod 305 is a threaded rod made of ceramic material. It should be noted that the heating material of the sintering furnace dedicated to 2:17 samarium cobalt permanent magnet material is a round rod-shaped graphite material. In addition to the heating electrode, the stone mill heating rod is hung on the graphite support of the sintering furnace inner liner. The two are fixed by graphite screws to prevent the heating graphite rod from shaking. When the graphite rod is energized for heating, the graphite support in the sintering furnace liner is also charged. When metal samarium is attached to it, it is easy to cause discharge and sparking with the sintering furnace liner. In this embodiment, the material of the supporting threaded rod 305 is 99 alumina ceramic, which ensures that the graphite heating rod and the graphite support in the sintering furnace liner are insulated, solving the problem of discharge and sparking.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the accompanying embodiments and their equivalents.

Claims

1. An improved vacuum discharge ignition device for a graphite heating element in a samarium-cobalt sintering furnace, comprising a graphite liner (102), characterized in that: An electrode hole is provided on the bottom side of the graphite liner (102), an electrode body (204) is sleeved between the inner walls of the electrode hole, a plurality of circles of ceramic sheets (202) are fixedly sleeved on the outer edge of one end of the electrode body (204) facing away from the graphite liner (102), a support hole is provided on one side of the graphite liner (102), a support threaded rod (305) is sleeved between the inner walls of the support hole, a graphite heating rod is screwed to one end of the support threaded rod (305), and the other end of the graphite heating rod is in contact with the electrode body (204).

2. The vacuum discharge ignition device for improving the graphite heating element in a samarium-cobalt sintering furnace according to claim 1, characterized in that: An electrode head (203) is fixedly connected to one end of the electrode body (204) facing the interior of the graphite liner (102), and the electrode head (203) and one end of the graphite heating rod are in contact with each other.

3. The vacuum discharge ignition device for improving the graphite heating element in a samarium-cobalt sintering furnace according to claim 1, characterized in that: The outer edge of the electrode body (204) is fixedly connected to a circle of sealing gasket (205), the outer edge of the sealing gasket (205) is in contact with the inner wall of the electrode hole, and the side of the sealing gasket (205) facing away from the graphite liner (102) is in contact with the ceramic sheet (202).

4. The vacuum discharge ignition device for improving the graphite heating element in a samarium-cobalt sintering furnace according to claim 1, characterized in that: An electrode connecting seat (201) is provided at one end of the electrode body (204) facing away from the electrode body (204), a plurality of clamping connecting rods (105) are fixedly connected to the bottom side of the electrode body (204), an electrode clamping sleeve (104) is fixedly connected to the bottom end of the clamping connecting rod (105), and the inner walls on both sides of the electrode clamping sleeve (104) are in contact with the outer edge of the electrode connecting seat (201).

5. The vacuum discharge ignition device for improving the graphite heating element in a samarium-cobalt sintering furnace according to claim 1, characterized in that: A graphite support seat (103) is fixedly connected to one side of the graphite liner (102), a connecting plate (301) is fixedly connected to the top side of the graphite support seat (103), a supporting body (302) is fixedly connected to the top side of the connecting plate (301), and a supporting outer frame (303) is fixedly connected to the top side of the supporting body (302).

6. The vacuum discharge ignition device for improving the graphite heating element in a samarium-cobalt sintering furnace according to claim 5, characterized in that: The inner wall of the supporting outer frame (303) and the supporting threaded rod (305) are sleeved together, and a protective washer (304) is provided at the junction of the supporting threaded rod (305) and the supporting outer frame (303). The supporting threaded rod (305) is a threaded rod made of ceramic material.

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