Vacuum furnace reduction process with coil discharging and loading functions

Abstract

The invention relates to a vacuum furnace reduction process with coil discharge, which comprises the following steps of: manufacturing a plurality of square graphite plates, uniformly and densely forming a plurality of air holes in the graphite plates, and manufacturing a plurality of high-temperature-resistant stainless steel trays; at least two layers of graphite columns are stacked in stainless steel trays, graphite plates are horizontally laid on a transfer trolley, then the stainless steel trays containing the graphite columns are stacked on the surfaces of the graphite plates layer by layer, and the transfer trolley is driven to send the stacked graphite columns into a drying oven for low-temperature roasting; after low-temperature roasting, the whole graphite column is taken out through a transfer trolley and transferred to a vacuum furnace to be subjected to vacuum roasting; according to the process, graphite plates do not need to be placed layer by layer, a multi-layer graphite plate structure is removed, the effective utilization space of a vacuum furnace and a drying oven is greatly increased, the number of graphite columns loaded in each furnace can be increased by more than 30%, the material trays do not need to be manually loaded one by one during discharging, and the material trays loaded with the graphite columns are directly lifted and put into a turnover box; the block rotting rate is reduced, and the roasting efficiency and the yield are effectively improved.

Description

Technical Field

[0001] The invention relates to the field of diamond artificial synthesis, and in particular to a vacuum furnace reduction process with a reel. Background Art

[0002] Diamond synthesis is divided into four processes: preparation of graphite columns, synthesis of diamonds, purification and selection. Among them, the reduction treatment of graphite columns is one of the key processes in the preparation of graphite columns. It involves high-temperature treatment of graphite columns in a vacuum furnace in a vacuum environment to remove impurities, oxides and other harmful substances, thereby improving the purity and performance of the material. This process is of great significance for artificial diamond synthesis because it can ensure the quality of the synthetic columns, which directly affects the quality and output of the final diamond.

[0003] The traditional method of loading the furnace after baking in a vacuum furnace is: place a graphite plate on the bottom plate of the vacuum furnace, then evenly stack a layer of graphite columns on the graphite plate, and then place another graphite plate between the upper surfaces of the graphite columns to stack the graphite columns, forming a stacking structure of one layer of graphite plate and one layer of graphite column. This method has low effective utilization of the vacuum furnace space, and the number of graphite columns loaded into each furnace is small, the baking efficiency is low and the fuel cost will be increased. In order to improve the stacking efficiency, the stacking is carried out by flipping the material tray, and the rotten block rate is relatively high; and when the graphite columns are taken out of the furnace, the workers need to pick up the graphite columns one by one by hand into the material tray, and then load them for transportation and storage. The process is cumbersome and inefficient. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a vacuum furnace reduction process with reel discharging.

[0005] The technical solution of the present invention is: a vacuum furnace reduction process with reel discharging, comprising the following steps: ① Make several square graphite plates, evenly and densely set several air holes on the graphite plates, and make several high-temperature resistant stainless steel trays; ② Place at least two layers of graphite columns in the stainless steel pallet, lay the graphite plate horizontally on the transfer vehicle, and then place the stainless steel pallets with graphite columns layer by layer on the surface of the graphite plate; ③ After stacking to the predetermined height, a layer of graphite plate is placed between the uppermost stainless steel trays to improve the stability of the stacking and baking structure of the stone mill columns and avoid ablation caused by close contact between the graphite columns and the heating elements; ④ Drive the transfer vehicle to deliver the stacked graphite columns into the oven for low-temperature roasting to remove the chemical reagents and water added during graphite powder granulation; ⑤ After low-temperature roasting, the graphite column is taken out as a whole by a transfer vehicle and transferred to a vacuum furnace for vacuum roasting. After vacuum roasting, it is taken out by a transfer vehicle and the trays containing the graphite column are placed into the turnover box one by one.

[0006] Preferably, the transfer vehicle is a leg-type lifting forklift, which is provided with at least three insertion rods at equal intervals, the graphite plate of the lowest layer is placed horizontally between the insertion rods, the bottom plate of the vacuum furnace and the oven is provided with four inverted grooved steel plates at equal intervals at least along its length direction, an inverted L-shaped support plate is integrally provided in the middle of the upper surface of the grooved steel plate, and an insertion gap is formed between the inverted L-shaped supports, and the vacuum furnace and the oven are both supported to a certain height by providing legs; when loading, the forklift is operated to insert its insertion legs between the bottom plate of the vacuum furnace or the oven and the ground, and the insertion rods are correspondingly moved in The graphite plate and the stainless steel tray with graphite columns are inserted into the insertion gap as a whole and enter the vacuum furnace or oven. The bottom graphite plate is located above the inverted L-shaped support plate. Then the insertion rod is driven down and the bottom graphite plate is horizontally supported on the upper surface of the inverted L-shaped support plate to complete the loading. When discharging, the forklift is operated to make its insertion rod re-enter the insertion gap, drive the insertion rod to rise and hold the bottom graphite plate, and drag the stone mill plate and the stainless steel tray with stone mill columns as a whole. The forklift moves outward to drag them out of the vacuum furnace or oven to complete the discharging.

[0007] Preferably, the spacing between adjacent inverted L-shaped support plates is the same as the spacing between adjacent insertion rods, and the spacing between adjacent inverted L-shaped support plates is larger than the size of the insertion rods.

[0008] Preferably, guide rails are provided on both sides of the bottom surface of the bottom plate of the vacuum furnace and the oven, and the spacing between the two guide rails matches the spacing between the two legs of the leg-type lifting forklift.

[0009] Preferably, a plurality of rollers are evenly arranged on the outer side surface of the plug leg through a support, and the rollers can fit the inner side surface of the guide rail and roll along the length direction thereof.

[0010] Preferably, a guide plate is provided at the outer end of the guide rail, and two guide plates form an eight-shaped introduction structure.

[0011] Preferably, in the process of stacking the stainless steel trays containing graphite columns upward, a layer of graphite plate is added between the upper and lower stainless steel trays containing different types of graphite columns to distinguish them and prevent confusion.

[0012] The beneficial technical effects of the present invention are: (1) The present invention only needs to place a layer of graphite plate at the bottom, and there is no need to place graphite plates layer by layer. The removal of the multi-layer graphite plate structure in the middle greatly increases the effective utilization space of the vacuum furnace and the oven. The number of graphite columns loaded in each furnace can be increased by more than 30%, and there is no need to turn over the material tray when loading the furnace, which reduces the rotten block rate and effectively improves the roasting efficiency and yield rate; (2) The present invention specifically improves the structure of the forklift and the vacuum furnace. The stainless steel tray with graphite columns stacked layer by layer on the surface of the graphite plates can be sent into the furnace body and dragged out of the furnace body in one operation. There is no need to pick up the graphite columns one by one by hand into the tray, and the furnace discharge efficiency is improved by more than 3 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the present invention that the stacked stainless steel trays loaded with graphite columns are about to be pushed into an oven or a vacuum furnace; Figure 2 yes Figure 1 AA section structural diagram; Figure 3 It is a three-dimensional structural diagram of a leg-type lifting forklift; Figure 4 It is a schematic diagram of the three-dimensional structure after the graphite columns are stacked on the graphite plate; Figure 5 It is a schematic diagram of the three-dimensional structure of the graphite plate; Figure 6 It is a schematic diagram of the three-dimensional structure behind the graphite column.

[0014] In the figure, 11. graphite plate, 111. air vent, 12. stainless steel tray, 13. graphite column, 3. oven, 31. support leg, 32. channel steel plate, 33. inverted L-shaped support plate, 34. guide rail, 35. guide plate, 2. plug-leg lift forklift, 21. plug rod, 22. plug leg, 23. roller. DETAILED DESCRIPTION

[0015] Embodiment 1, see attached Figure 3-6 , a vacuum furnace reduction process with reel discharging, the process steps are as follows: ① Make several square graphite plates, evenly and densely set several air holes on the graphite plates, and make several high-temperature resistant stainless steel trays; ② Place at least two layers of graphite columns in the stainless steel pallet, lay the graphite plate horizontally on the transfer vehicle, and then place the stainless steel pallets with graphite columns on the surface of the graphite plate layer by layer. There are 4 stainless steel pallets on each graphite plate. When stacking the stainless steel pallets with graphite columns upward, add a layer of graphite plate between the upper and lower stainless steel pallets with different types of graphite columns to distinguish them; ③ After stacking to the predetermined height, a layer of graphite plate is placed between the uppermost stainless steel trays to improve the stability of the stacking and baking structure of the stone grinding columns, and to avoid ablation caused by close contact between the graphite columns and the heating elements; This stacking method using stainless steel pallets only requires placing a layer of graphite plates at the bottom, without the need to place graphite plates layer by layer. This greatly increases the effective utilization space of the vacuum furnace and oven, and the number of graphite columns loaded in each furnace can be increased by more than 30%.

[0016] ④ Drive the transfer vehicle to deliver the stacked graphite columns into the oven for low-temperature roasting. The powdered raw materials need to be granulated before the graphite columns are pressed and formed. Chemical reagents and water are used in the granulation process. Chemical reagents are used to condense and solidify the powdered raw materials to prevent the powdered raw materials from being in a fluffy state. At the same time, it can also prevent the metal components inside the powdered raw materials from sinking and causing uneven distribution, thereby improving the molding quality of the graphite columns. Low-temperature roasting is used to remove the chemical reagents and water added during the granulation of the raw materials, in preparation for vacuum roasting, to prevent chemical reagents and water from corroding, coking or clogging the pipelines of vacuum furnaces and vacuum pumps, and affecting the reduction quality; ⑤ After low-temperature roasting, use a transfer vehicle to take out the stone mill column as a whole and transfer it to a vacuum furnace for vacuum roasting. During the vacuum roasting process, heat will pass through the air holes evenly and densely arranged on the graphite plate, so that the heat can flow evenly in the furnace body, ensuring that the inner and outer layers of the stone mill column can be evenly heated, avoiding the phenomenon of uneven vacuum roasting quality. After vacuum roasting, take it out and put it into a turnover box.

[0017] The transfer vehicle of this embodiment is a leg-type lifting forklift, which is provided with at least three insertion rods at equal intervals, and the cross section of the insertion rod is T-shaped. The graphite plate of the lowest layer is placed horizontally between the insertion rods, and 2-3 graphite plates are placed between the insertion rods. The bottom plate of the vacuum furnace and the oven is provided with four inverted grooved steel plates at equal intervals at least along its length direction. An inverted L-shaped support plate is integrally provided in the middle of the upper surface of the grooved steel plate, and an insertion gap is formed between the inverted L-shaped supports. The vacuum furnace and the oven are both supported to a certain height by setting legs; when loading, the forklift is operated to insert its legs into the bottom plate of the vacuum furnace or the oven. The rods are inserted into the gap between the ground and the stone mill plate, and the stone mill plate and the stainless steel tray with stone mill columns are inserted into the vacuum furnace or oven as a whole. The bottom graphite plate is located above the inverted L-shaped support plate, and then the rods are driven down. The bottom graphite plate is horizontally supported on the upper surface of the inverted L-shaped support plate to complete the loading. When discharging, the forklift is operated to re-enter the insertion gap, drive the rods up to drag the bottom graphite plate, and drag the stone mill plate and the stainless steel tray with stone mill columns as a whole. The forklift moves outward to drag them out of the vacuum furnace or oven to complete the discharging. This targeted improvement of the leg-type lifting forklift and the vacuum furnace structure can deliver the stainless steel tray with graphite columns stacked layer by layer on the surface of the graphite plate into the furnace body and drag it out of the furnace body in one operation, greatly improving the efficiency of discharging the furnace.

[0018] The spacing between adjacent inverted L-shaped support plates is the same as the spacing between adjacent insertion rods. This size design enables the insertion rod to be inserted into the middle position between the L-shaped support plates. The spacing between adjacent inverted L-shaped support plates is larger than the size of the insertion rod, ensuring that the insertion rod can move in and out of the insertion gap to discharge and discharge materials.

[0019] Embodiment 2, see attached Figure 1-3 This embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that: guide rails are provided on both sides of the bottom surface of the bottom plate of the vacuum furnace and the oven, and the spacing between the two guide rails matches the spacing between the two legs of the leg-type lifting forklift. When the legs enter the vacuum furnace or the oven, the two guide rails provide guidance for the legs, so that the plug rod and the graphite plate can quickly and accurately enter the vacuum furnace or the oven; and a plurality of rollers are evenly provided on the outer side of the legs through the support, and the rollers can roll along the length direction of the legs in contact with the inner side of the legs. When the guide rails provide guidance for the legs, the friction between the two is reduced by rolling the rollers, thereby avoiding large-scale vibration during loading or unloading, and ensuring the stability of the stacking structure between the graphite plate and the stone mill column.

[0020] A guide plate is provided at the outer end of the guide rail, and the two guide plates form an eight-shaped introduction structure, which can quickly insert the plug legs into between the two guide rails to avoid collision between the plug legs, thereby improving loading efficiency and loading safety.

Claims

1. A vacuum furnace reduction process with reel discharging, characterized by comprising the following steps: ① Make several square graphite plates, evenly and densely set several air holes on the graphite plates, and make several high-temperature resistant stainless steel trays; ② Place at least two layers of graphite columns in the stainless steel pallet, lay the graphite plate horizontally on the transfer vehicle, and then place the stainless steel pallets with graphite columns layer by layer on the surface of the graphite plate; ③ After stacking to the predetermined height, a layer of graphite plate is placed between the uppermost stainless steel trays to improve the stability of the stacking and baking structure of the stone mill columns and avoid ablation caused by close contact between the graphite columns and the heating elements; ④ Drive the transfer vehicle to deliver the stacked graphite columns into the oven for low-temperature roasting to remove the chemical reagents and water added during graphite powder granulation; ⑤ After low-temperature roasting, the graphite column is taken out as a whole by a transfer vehicle and transferred to a vacuum furnace for vacuum roasting. After vacuum roasting, it is taken out by a transfer vehicle and the trays containing the graphite column are placed into the turnover box one by one.

2. A vacuum furnace reduction process with reel discharging according to claim 1, characterized in that: The transfer vehicle is a leg-type lifting forklift, which is provided with at least three insertion rods at equal intervals, and the graphite plate of the lowest layer is placed horizontally between the insertion rods. The bottom plate of the vacuum furnace and the oven is provided with four inverted grooved steel plates at equal intervals at least along its length direction, and an inverted L-shaped support plate is integrally provided in the middle of the upper surface of the grooved steel plate, and an insertion gap is formed between the inverted L-shaped supports. The vacuum furnace and the oven are both supported to a certain height by setting legs; when loading, the forklift is operated to insert its insertion legs between the bottom plate of the vacuum furnace or the oven and the ground, and the insertion rods are correspondingly inserted into Insert the graphite plate and the stainless steel tray with graphite columns into the vacuum furnace or oven as a whole, and the bottom graphite plate is located above the inverted L-shaped support plate. Then drive the insertion rod down, and the bottom graphite plate is horizontally supported on the upper surface of the inverted L-shaped support plate to complete the loading. When discharging, operate the forklift to re-enter the insertion gap, drive the insertion rod up to support the bottom graphite plate, and drag the stone mill plate and the stainless steel tray with stone mill columns as a whole. The forklift moves outward to drag it out of the vacuum furnace or oven to complete the discharging.

3. The vacuum furnace reduction process with reel discharging according to claim 2 is characterized by: The spacing between adjacent inverted L-shaped support plates is the same as the spacing between adjacent insertion rods, and the spacing between adjacent inverted L-shaped support plates is larger than the size of the insertion rods.

4. The vacuum furnace reduction process with reel discharging according to claim 2 is characterized by: Guide rails are arranged on both sides of the bottom surface of the bottom plate of the vacuum furnace and the oven, and the spacing between the two guide rails matches the spacing between the two legs of the leg-type lifting forklift.

5. A vacuum furnace reduction process with reel discharging according to claim 4, characterized in that: A plurality of rollers are evenly arranged on the outer side surface of the insert leg through a support, and the rollers can be fitted to the inner side surface of the guide rail and roll along the length direction thereof.

6. The vacuum furnace reduction process with reel discharging according to claim 4 is characterized by: A guide plate is provided at the outer end of the guide rail, and two guide plates form an eight-shaped introduction structure.

7. The vacuum furnace reduction process with reel discharging according to claim 1 is characterized by: In the process of stacking the stainless steel pallets containing graphite columns upward, a layer of graphite plate is added between the upper and lower stainless steel pallets containing different types of graphite columns to distinguish them and prevent confusion.

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