Carbonization device for preparing non-uniform tungsten carbide powder

Abstract

The utility model provides a carbonization device for preparing non-uniform tungsten carbide powder. The carbonization device comprises at least two carbonization units which are arranged in sequence, the carbonization unit comprises a heating furnace and a cooling area arranged at the rear end of the heating furnace, and furnace doors are arranged at the front end and the rear end of the heating furnace; between two adjacent carbonization units, the front end of the heating furnace of the rear carbonization unit is arranged at the rear end of the cooling area of the front carbonization unit. According to the carbonization device, tungsten powder of the same model is adopted, the carbonization temperature of each carbonization unit is set according to the process requirement, tungsten carbide powder with different grain sizes is prepared at the same time through different carbonization temperatures so as to be used in the non-uniform hard alloy, the production efficiency of the non-uniform hard alloy can be improved, and the production cost of the non-uniform hard alloy can be reduced; and meanwhile, the tedious degree and the preparation cost of preparation of tungsten carbide powder with different grain sizes are reduced.

Description

Technical Field

[0001] This utility model relates to the field of carbonization furnace technology, and specifically to a carbonization device for preparing non-uniform tungsten carbide powder. Background Technology

[0002] WC-Co (tungsten carbide-cobalt) alloy is a relatively traditional cemented carbide material. However, the high hardness and high toughness of WC-Co alloy are contradictory. To prepare a "dual-high" alloy that combines both high hardness and high toughness, using a cemented carbide with a non-uniform structure is one of the effective methods to achieve this.

[0003] Current methods for preparing heterogeneous WC-Co alloys use a composite matrix of WC powder (tungsten carbide powder) of various particle sizes. The resulting mixture is then wet-milled, dried, pressed, and sintered to obtain a heterogeneous cemented carbide. However, this process is problematic because the coarse, medium, and fine-grained tungsten carbide powders are prepared separately using different raw materials and furnaces. Their inherent heterogeneity is difficult to control effectively, leading to unstable properties in the prepared heterogeneous alloy. Furthermore, the need to prepare tungsten carbide powders of different particle sizes separately makes the production process cumbersome and costly.

[0004] In summary, there is an urgent need for a carbonization apparatus for the preparation of non-uniform tungsten carbide powder to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a carburizing device for preparing non-uniform tungsten carbide powder, aiming to solve the problems of existing technologies that use different raw materials and furnaces to prepare different types of tungsten carbide powder, resulting in difficulty in stably and effectively controlling the inherent non-uniformity, as well as cumbersome and costly production processes. The specific technical solution is as follows:

[0006] A carbonization apparatus for preparing non-uniform tungsten carbide powder includes at least two carbonization units arranged sequentially; each carbonization unit includes a heating furnace and a cooling zone disposed at the rear end of the heating furnace, and both the front and rear ends of the heating furnace are provided with furnace doors; between two adjacent carbonization units, the front end of the heating furnace of the rear carbonization unit is disposed at the rear end of the cooling zone of the front carbonization unit.

[0007] The preferred embodiment of the above technical solution also includes a feeding furnace tube, which is located at the front end of the heating furnace of the foremost carbonization unit.

[0008] In the preferred embodiment of the above technical solutions, the heating temperature adjustment range of the heating furnace is 0 to 2400℃.

[0009] In a preferred embodiment of the above technical solutions, the heating furnace is equipped with a temperature measuring instrument, which is used to detect the temperature inside the heating furnace.

[0010] In a preferred embodiment of the above technical solutions, the heating furnace is further provided with a thermocouple, and the thermocouple and the temperature measuring instrument are respectively arranged on both sides of the heating furnace.

[0011] In the preferred embodiment of the above technical solutions, the length of both the heating furnace and the cooling zone ranges from 1 to 3 meters.

[0012] In the preferred embodiment of the above technical solutions, the furnace wall of the heating furnace includes a graphite layer, a hard carbon felt layer, a carbon black layer, and a furnace shell layer arranged sequentially from the inside out.

[0013] In the preferred embodiment of the above technical solution, the thickness of the graphite layer is 35-45mm, the thickness of the hard carbon felt layer is 75-85mm, the thickness of the carbon black layer is 380-420mm, and the thickness of the furnace shell layer is 10-20mm.

[0014] In a preferred embodiment of the above technical solutions, the lower part of the heating furnace is provided with a graphite crossbeam, which is used to support the heating furnace.

[0015] The preferred embodiment of the above technical solution also includes a control system, which can individually adjust the carbonization temperature of each carbonization unit.

[0016] The application of the technical solution of this utility model has the following beneficial effects:

[0017] The carbonization device of this invention uses the same type of tungsten powder. The carbonization temperature of each carbonization unit is set according to the process requirements. Tungsten carbide powder with different grain sizes is prepared at different carbonization temperatures at the same time for use in non-uniform cemented carbide, which can improve the production efficiency of non-uniform cemented carbide and reduce its production cost.

[0018] Compared to existing technologies that use different raw materials and furnaces to prepare different types of tungsten carbide powder, the carbonization device of this invention can produce tungsten carbide powder with different grain sizes by feeding in the same type of tungsten powder and setting the carbonization temperature of each carbonization unit. This reduces the complexity of preparing tungsten carbide powder with different grain sizes and also reduces the preparation cost.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the carbonization device of this utility model;

[0022] Figure 2 yes Figure 1 Cross-sectional view of the central heating furnace;

[0023] Among them, 1. Feed furnace tube, 2. Heating furnace, 2.1. Heating furnace tube, 2.2. Graphite layer, 2.3. Hard carbon felt layer, 2.4. Carbon black layer, 2.5. Furnace shell layer, 2.6. Graphite crossbeam, 3. Furnace door, 4. Temperature measuring instrument, 5. Cooling zone. Detailed Implementation

[0024] To facilitate understanding of this invention, a more comprehensive description is provided below, along with preferred embodiments. However, this invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0026] Example:

[0027] See Figures 1-2 This embodiment provides a carbonization apparatus for preparing non-uniform tungsten carbide powder, comprising at least two carbonization units arranged in sequence; each carbonization unit includes a heating furnace 2 and a cooling zone 5 disposed at the rear end of the heating furnace 2, and both the front and rear ends of the heating furnace 2 are provided with furnace doors 3; between two adjacent carbonization units, the front end of the heating furnace 2 of the rear carbonization unit is disposed at the rear end of the cooling zone 5 of the front carbonization unit.

[0028] Preferably, the heating temperature (i.e., carbonization temperature) of the heating furnace in each carbonization unit can be adjusted and controlled independently. By setting different carbonization temperatures for the heating furnace 2 of each carbonization unit, the carbonization device in this embodiment can simultaneously prepare tungsten carbide powder with multiple grain sizes. Furthermore, the heating temperature adjustment range of the heating furnace 2 is 0 to 2400°C.

[0029] like Figure 1As shown, this embodiment includes three carbide units arranged in sequence, enabling the simultaneous preparation of tungsten carbide powders with fine, medium, and coarse grain sizes. Those skilled in the art can connect different numbers of carbide units in series according to different preparation requirements to obtain tungsten carbide powders with corresponding grain sizes.

[0030] See Figure 1 The carbonization apparatus further includes a feed furnace tube 1, which is located at the front end of the heating furnace 2 of the foremost carbonization unit. Furthermore, in the carbonization apparatus, the heating furnace 2 and cooling zone 5 within the carbonization unit are interconnected, and the heating furnace 2 and cooling zone 5 between adjacent carbonization units are also interconnected. Therefore, the feed furnace tube 1 can push materials into the corresponding carbonization unit, enabling the preparation of tungsten carbide powder with different grain sizes at different carbonization temperatures.

[0031] Preferably, the heating furnace 2 is equipped with a temperature measuring instrument 4, which is used to detect the internal temperature of the heating furnace 2. In this embodiment, a high-precision infrared thermometer is used to accurately monitor the internal temperature of the heating furnace, ensuring a temperature control error of ±2℃. Furthermore, in this embodiment, a thermocouple is also provided on the heating furnace 2, with the thermocouple and the temperature measuring instrument 4 respectively positioned on opposite sides of the heating furnace 2. The thermocouple can be used to monitor the accuracy of the infrared thermometer and also to monitor changes in the heat insulation performance of the heating furnace 2. Preferably, the thermocouple and the temperature measuring instrument are arranged opposite each other on opposite sides of the heating furnace 2. This opposite arrangement allows for more accurate monitoring of the temperature measurement accuracy of the infrared thermometer.

[0032] Preferably, the lengths of the heating furnace 2 and the cooling zone 5 are both 1-3 meters. Those skilled in the art can adjust and select the lengths of the heating furnace 2 and the cooling zone 5 according to actual needs. This embodiment will not provide a detailed description of this aspect.

[0033] See Figure 2 The heating furnace 2 is equipped with a heating furnace tube 2.1 inside. The material is fed into the heating furnace tube 2.1 through a boat to complete the carbonization heating. A heating device (not shown) is arranged in the space between the furnace wall of the heating furnace 2 and the heating furnace tube 2.1. For the arrangement of the heating device, please refer to the prior art, such as the Chinese patent with publication number CN220788902U, which discloses a square tube carbonization furnace equipped with a heating device. In addition, those skilled in the art may also use other structural forms to set the heating device.

[0034] Furthermore, the furnace wall of the heating furnace 2 includes, from the inside out, a graphite layer 2.2, a hard carbon felt layer 2.3, a carbon black layer 2.4, and a furnace shell layer 2.5. The graphite layer 2.2 has a thickness of 35-45 mm, the hard carbon felt layer 2.3 has a thickness of 75-85 mm, the carbon black layer 2.4 has a thickness of 380-420 mm, and the furnace shell layer 2.5 has a thickness of 10-20 mm. The arrangement of the graphite layer, hard carbon felt layer, carbon black layer, and furnace shell layer provides the heating furnace in this embodiment with good heat preservation performance, preventing heat loss and ensuring the heating temperature reaches the set carbonization temperature. Simultaneously, because graphite has good stability at high temperatures and can operate at temperatures up to 3000℃, the innermost layer being a graphite layer prevents the hard carbon felt layer and carbon black layer from softening at high temperatures and coming into contact with the heating device, thus preventing short circuit damage to the heating element, ensuring the normal operation of the heating furnace, and extending its service life.

[0035] Preferably, in this embodiment, the thickness of the graphite layer 2.2 is 40 mm, the thickness of the hard carbon felt layer 2.3 is 80 mm, the thickness of the carbon black layer 2.4 is 400 mm, and the thickness of the furnace shell layer 2.5 is 15 mm.

[0036] Preferably, the lower part of the heating furnace 2 is provided with a graphite crossbeam 2.6, which is used to support the heating furnace 2.

[0037] Preferably, the cooling zone 5 is used to cool the material heated by the heating furnace 2. In this embodiment, the cooling zone uses a combination of water cooling and air cooling to cool the material. For the structural configuration of the cooling zone, please refer to the prior art, such as the Chinese patent with publication number CN208833012U, which discloses a cooling device for a high-temperature molybdenum wire furnace tube. This embodiment will not describe it in detail. In addition, in some embodiments, other structural forms and other cooling methods may be used to cool the material, which is not limited here.

[0038] Preferably, the furnace door 3 in this embodiment has an arc-shaped structure, which has good sealing performance and can prevent air leakage and temperature cross-contamination. For the structural design of the furnace door 3, please refer to the prior art, such as the door valve for a pushboat-type tunnel furnace disclosed in Chinese Patent Publication No. CN207796126U. In addition, the furnace door in this embodiment can also be implemented using other existing structures, which will not be listed and described in this embodiment.

[0039] Preferably, the carbonization apparatus further includes a control system capable of individually adjusting the carbonization temperature of each carbonization unit, allowing each unit to be set with a corresponding carbonization temperature according to the desired grain size. Further, the control system generally includes a PLC controller, which controls the heating devices in each furnace to reach the set carbonization temperature. Simultaneously, the PLC controller acquires temperature values ​​measured by a thermometer and thermocouples, correcting the temperature in the furnace to form a closed-loop control. In addition, the PLC controller is generally also responsible for controlling other functions of the carbonization apparatus, such as opening and closing the furnace door, controlling heating time, and controlling cooling time, etc. This is common knowledge in the art and will not be described in detail.

[0040] The working process of the carbonization device in this embodiment is as follows:

[0041] Step 1: Select a batch of tungsten powder, add carbon black and mix evenly, then put it into a boat-shaped container;

[0042] Step 2: The boat filled with materials is pushed in an orderly manner from the feed furnace tube 1 and arrives at each carbonization unit in turn;

[0043] The boats are typically pushed in using cylinders or servo motors, and the boats move forward by contacting each other. When pushing them in, the number of boats loaded with materials needs to be calculated based on the length of each heating furnace, and the number of empty boats needs to be calculated based on the length of the cooling zone.

[0044] Step 3: Set the carbonization temperature of each heating furnace according to the process requirements, and send power to heat up and carbonize according to the program;

[0045] Step 4: After the set carbonization time is reached, the power is cut off and the material is pushed to the cooling area of ​​each carbonization unit;

[0046] Step 5: After the material is cooled in each cooling zone, it is gradually pushed out and collected separately in each zone; then, after ball milling and sieving, tungsten carbide powder with fine, medium and coarse grain sizes is prepared.

[0047] The carbonization device in this embodiment uses the same type of tungsten powder. The carbonization temperature of each carbonization unit is set according to the process requirements. Tungsten carbide powder with different grain sizes is prepared at different carbonization temperatures at the same time for use in non-uniform cemented carbide, which can improve the production efficiency of non-uniform cemented carbide and reduce its production cost.

[0048] Compared to existing technologies that use different raw materials and furnaces to prepare different types of tungsten carbide powder, the carbonization device in this embodiment can produce tungsten carbide powder with different grain sizes by feeding in the same type of tungsten powder and setting the carbonization temperature of each carbonization unit. This reduces the complexity of preparing tungsten carbide powder with different grain sizes and also reduces the preparation cost.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A carbonization apparatus for preparing non-uniform tungsten carbide powder, characterized in that, It includes at least two carbonization units arranged in sequence; the carbonization unit includes a heating furnace (2) and a cooling zone (5) arranged at the rear end of the heating furnace (2), and the heating furnace (2) is provided with furnace doors (3) at both the front and rear ends; between two adjacent carbonization units, the front end of the heating furnace (2) of the rear carbonization unit is located at the rear end of the cooling zone (5) of the front carbonization unit.

2. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 1, characterized in that, It also includes a feed furnace tube (1), which is located at the front end of the carbonization unit heating furnace (2).

3. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 1, characterized in that, The heating temperature adjustment range of the heating furnace (2) is 0 to 2400℃.

4. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 1, characterized in that, The heating furnace (2) is equipped with a temperature measuring instrument (4), which is used to detect the temperature inside the heating furnace (2).

5. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 4, characterized in that, The heating furnace (2) is also equipped with thermocouples, and the thermocouples and the temperature measuring instrument (4) are respectively set on both sides of the heating furnace (2).

6. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 1, characterized in that, The lengths of the heating furnace (2) and the cooling zone (5) are both 1-3 meters.

7. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 1, characterized in that, The furnace wall of the heating furnace (2) includes a graphite layer (2.2), a hard carbon felt layer (2.3), a carbon black layer (2.4), and a furnace shell layer (2.5) arranged sequentially from the inside out.

8. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 7, characterized in that, The graphite layer (2.2) has a thickness of 35-45 mm, the hard carbon felt layer (2.3) has a thickness of 75-85 mm, the carbon black layer (2.4) has a thickness of 380-420 mm, and the furnace shell layer (2.5) has a thickness of 10-20 mm.

9. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 7, characterized in that, The lower part of the heating furnace (2) is provided with a graphite crossbeam (2.6), which is used to support the heating furnace (2).

10. The carburizing apparatus for preparing non-uniform tungsten carbide powder according to claim 1, characterized in that, It also includes a control system that can individually adjust the carbonization temperature of each carbonization unit.

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