Matrix graphite powder wet material drying device and process

Abstract

The invention particularly relates to a base body graphite powder wet material drying device which comprises a mesh belt, a comprehensive supporting frame, a mesh belt driving mechanism, an elevator material disc and an elevator driving mechanism. A plurality of layers of mesh belts are arranged on the comprehensive supporting frame; the mesh belts between the layers are mutually staggered in the horizontal direction; scrapers tightly attached to the mesh belts are arranged at the lower ends of the sides, in the blanking direction, of the mesh belts on the comprehensive supporting frame, and heating sources are arranged in the middles of the mesh belts on the comprehensive supporting frame; a plurality of mesh belt driving mechanisms are mounted on the comprehensive supporting frame, and the mesh belt driving mechanisms and the mesh belts are the same in number and are matched one by one; the number of layers of the mesh belts is an even number, and each layer of mesh belt is used for moving under the driving of a respective matched mesh belt driving mechanism; the top end of the elevator tray is arranged above the receiving position of the topmost mesh belt, the bottom end of the elevator tray is arranged below the blanking position of the bottommost mesh belt, and the elevator tray is driven by an elevator driving mechanism to move. According to the method, automatic drying of the wet matrix graphite powder is achieved, and the drying treatment capacity of the wet matrix graphite powder is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material drying, and in particular to a device and process for drying wet material of matrix graphite powder for high temperature gas-cooled reactor fuel elements. Background Art

[0002] The ceramic fuel element used in the pebble bed high temperature gas-cooled reactor is a spherical coated particle dispersed in the graphite matrix of the fuel area. The powder used in the graphite matrix is ​​made by fully kneading natural graphite, artificial graphite, phenolic resin and ethanol, drying and crushing. The material after fully kneading natural graphite, artificial graphite, phenolic resin and ethanol is the matrix graphite powder wet material.

[0003] At present, the drying process of the matrix graphite powder wet material is a vacuum drying oven static drying process. This process is to place the granulated matrix graphite powder wet material on a tray and send it into a vacuum drying oven for drying to achieve the drying of the matrix graphite powder wet material. The batch processing capacity of the matrix graphite powder wet material of this process is limited by the volume and number of sets of the drying oven and the drying progress of the matrix graphite powder wet material at the bottom of the tray. In addition, the process has a low degree of automation, and it is difficult to continue to expand production capacity based on this process.

[0004] In the face of the commercialization trend of high-temperature gas-cooled reactors and the large-scale production of fuel elements, there is an urgent need for a matrix graphite powder wet material drying device and process with a higher degree of automation and higher processing capacity. Summary of the invention

[0005] The object of the present invention is to provide a matrix graphite powder wet material drying device and process, so as to realize automatic drying of the matrix graphite powder wet material and improve the matrix graphite powder wet material drying processing capacity.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A matrix graphite powder wet material drying device, comprising a mesh belt, a comprehensive support frame, a mesh belt driving mechanism, an elevator material tray and an elevator driving mechanism;

[0008] Multiple layers of mesh belts are arranged on the comprehensive support frame, the mesh belt spacing between the layers is greater than the cloth thickness, and the mesh belts between the layers are staggered in the horizontal direction; a scraper close to the mesh belt is provided at the lower end of one side of the material dropping direction of each layer of mesh belt on the comprehensive support frame, and a heating source is provided in the middle of each layer of mesh belt on the comprehensive support frame;

[0009] A plurality of mesh belt driving mechanisms are installed on the integrated support frame. The number of mesh belt driving mechanisms is the same as the number of mesh belt layers and they are matched one by one. Each layer of mesh belt moves under the drive of its own matching mesh belt driving mechanism.

[0010] The number of mesh belt layers is an even number. Each layer of mesh belt is used to move under the drive of its own matching mesh belt driving mechanism. The movement direction of the mesh belt with an odd number of layers is opposite to that of the mesh belt with an even number of layers to realize the material receiving and dropping of each layer of mesh belt. The top layer of mesh belt moves away from the material tray of the elevator to realize material discharge.

[0011] The top of the elevator material tray is above the material receiving position of the top mesh belt, and the bottom end is below the material dropping position of the bottom mesh belt. It is used to move under the drive of the elevator drive mechanism to achieve material receiving from the bottom mesh belt and dropping to the top mesh belt.

[0012] In the present invention, as one of the feasible ways, the mesh belt is a dense mesh belt woven with crankshaft-type metal wires, and the material is a material that can withstand the use environment of 150°C ethanol vapor; the pitch of the mesh belt is less than 8mm, and the mesh spacing is less than or equal to 3mm; the mesh belt adopts a double-pitch chain design.

[0013] In the present invention, as one of the feasible ways, the material of the integrated support frame is a material that can withstand the use environment of 150°C ethanol vapor.

[0014] In the present invention, as one of the achievable methods, the material resistant to the use environment of 150° C. ethanol vapor includes 304 stainless steel and 316 stainless steel.

[0015] In the present invention, as one of the feasible ways, the integrated support frame is provided with multiple layers of transverse pallets through the support shaft; the number of transverse pallet layers is the same as the number of mesh belt layers and is matched one by one, and the single-layer transverse pallet is arranged in the middle of the single-layer mesh belt; a heating source is arranged at the single-layer transverse pallet in the middle of the single-layer mesh belt on the integrated support frame; the single mesh belt driving mechanism is connected to the matching single-layer mesh belt through the transmission shaft to drive the single-layer mesh belt to operate.

[0016] In the present invention, as one possible implementation, the scraper is made of polytetrafluoroethylene or stainless steel.

[0017] In the present invention, as one of the achievable methods, the heating source is a heat transfer oil pipe or a heating wire.

[0018] In the present invention, as one of the feasible ways, the mesh belt driving mechanism is a servo motor combined with a reducer structure.

[0019] In the present invention, as one of the achievable methods, the elevator material tray includes a sprocket and a plurality of material trays densely arranged on the sprocket; the material trays are densely arranged; and the elevator driving mechanism is connected to a single axis at the center of the upper end of each material tray.

[0020] In the present invention, as one of the feasible ways, the driving mechanism of the elevator is a servo motor combined with a reducer structure, the servo motor and the reducer drive the sprocket to move, and the movement direction of the sprocket is controlled by the gear of the sprocket; a horizontal moving area is set on the sprocket below the bottom mesh belt to ensure that the material is received from the bottom mesh belt; a turning area is set on the sprocket above the top mesh belt to ensure that the material falls to the top mesh belt.

[0021] The present invention also provides a matrix graphite powder wet material drying process, including material distribution, material movement control, material drying and ethanol recovery; the incoming material treated by the process is granulated matrix graphite powder wet material, and the material after the process treatment is granulated particles after the matrix graphite powder wet material is dried.

[0022] In the present invention, as one of the feasible ways, the cloth is laid in such a way that the incoming material is evenly distributed on the mesh belt according to the set cloth thickness; the cloth thickness is calculated according to the incoming material quantity and the cloth area of ​​the mesh belt; the change of the set cloth thickness over time during the laying period is calculated according to the incoming material rate; and the change of the distance between the laying tooling and the mesh belt during the laying period and the final position are set according to the change of the cloth thickness and the thickness of the laying process over time.

[0023] In the present invention, as one of the achievable ways, the material movement control is to control the automatic transfer of the material between different layers of mesh belts to turn the material over during the material drying process.

[0024] In the present invention, as one of the achievable methods, material movement control includes the following steps:

[0025] Set the movement direction of the mesh belt and the elevator tray. The movement direction of the odd-numbered mesh belt from top to bottom is to make the material move away from the elevator tray, and the movement direction of the even-numbered mesh belt from top to bottom is to make the material move towards the elevator tray. The movement direction of the elevator tray is from the side close to the mesh belt to the top of the elevator tray after the bottom end of the elevator tray receives the material;

[0026] Set the movement speed of the mesh belt and the hoist tray. The movement speed of the mesh belt is set according to the servo motor speed of the mesh belt drive mechanism, the reduction ratio of the reducer, and the chain sprocket parameters of the mesh belt; the movement speed of the hoist tray is set according to the servo motor speed of the hoist drive mechanism, the reduction ratio of the reducer, the chain sprocket parameters of the hoist tray, the material thickness, the volume of a single tray, and the loading amount of a single tray;

[0027] During the material drying process, the mesh belt and the elevator material tray are started to move; when discharging the material, the movement direction of the lowest mesh belt is changed, and the material is discharged from the side of the lowest mesh belt away from the elevator material tray.

[0028] In the present invention, as one of the achievable methods, the material is dried by evaporating the ethanol in the wet material of the matrix graphite powder;

[0029] The material drying method uses the mold temperature controller as the heat source and the heat transfer oil as the heat transfer medium; the material drying includes: setting the heating temperature in the dryer to (75-105)°C, controlling the temperature uniformity by setting the heating area to ≤±1.0°C, the heating time to (6-20)h, and selecting the material feeding point or the material distribution completion point as the heating starting point;

[0030] Material movement control and ethanol recovery remain operational while the material is drying.

[0031] In the present invention, as one of the achievable methods, ethanol recovery is to re-condense and collect the ethanol evaporated from the wet material of the matrix graphite powder by two-stage condensation;

[0032] The first stage of condensation is chilled water condensation, the chilled water temperature is set to (5-10)°C, and the chilled water inlet pressure is >20kPa;

[0033] The second stage of condensation is refrigerant condensation, the refrigerant temperature is set to (-15~-30)℃, and the refrigerant inlet pressure is >20kPa;

[0034] After the material drying starts in the first stage of condensation, the vacuum equipment and ethanol recovery equipment are started. When the vacuum degree drops to 0.03MPa, the vacuum equipment is turned off. When the vacuum degree rises to 0.08MPa, the vacuum equipment is started. This cycle is repeated until the material drying is completed.

[0035] After the material drying begins in the second stage of condensation, the vacuum equipment and ethanol recovery equipment are started to add argon gas to the dryer. The vacuum degree is controlled at (0.05~0.08)MPa by controlling the argon gas replenishment rate and the vacuum pump valve opening until the material drying is completed.

[0036] Beneficial technical effects of the present invention:

[0037] The matrix graphite powder wet material drying device and process of the present invention adopt a multi-layer mesh belt to dry the matrix graphite powder wet material, thereby realizing automatic drying of the matrix graphite powder wet material and improving the matrix graphite powder wet material drying processing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of an embodiment of a substrate graphite powder wet material drying device of the present invention;

[0039] Figure 2 It is a stereoscopic diagram of an embodiment of the matrix graphite powder wet material drying device of the present invention.

[0040] In the figure, 1. mesh belt; 2. integrated support frame; 3. mesh belt driving mechanism; 4. elevator material tray; 5. elevator driving mechanism. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “left end”, “right end”, “above”, “below”, “outside”, “inside”, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] The present invention provides a matrix graphite powder wet material drying device, comprising a mesh belt 1, an integrated support frame 2, a mesh belt driving mechanism 3, an elevator material tray 4 and an elevator driving mechanism 5;

[0044] Multiple layers of mesh belts 1 are arranged on the integrated support frame 2, the spacing between the layers of mesh belts 1 is greater than the thickness of the cloth, and the mesh belts between the layers are staggered in the horizontal direction; a scraper close to the mesh belt is provided at the lower end of one side of the material dropping direction of each layer of mesh belts 1 on the integrated support frame 2, and a heating source is provided in the middle of each layer of mesh belts 1 on the integrated support frame 2;

[0045] A plurality of mesh belt driving mechanisms 3 are installed on the integrated support frame 2. The number of mesh belt driving mechanisms 3 is the same as the number of layers of the mesh belt 1 and they are matched one by one. Each layer of the mesh belt 1 moves under the drive of its own matched mesh belt driving mechanism 3.

[0046] The number of layers of the mesh belt 1 is an even number; each layer of the mesh belt 1 is used to move under the drive of its own matching mesh belt driving mechanism 3; the movement direction of the mesh belt 1 with an odd number of layers is opposite to that of the mesh belt 1 with an even number of layers to realize the material receiving and dropping of each layer of the mesh belt 1; the top layer of the mesh belt 1 runs in a direction away from the elevator material tray 4 to realize material discharge;

[0047] The top of the elevator material tray 4 is above the material receiving position of the top mesh belt 1, and the bottom is below the material dropping position of the bottom mesh belt 1. It is used to move under the drive of the elevator drive mechanism 5 to receive materials from the bottom mesh belt 1 and drop materials to the top mesh belt 1.

[0048] The integrated support frame 2 is used to arrange multiple layers of mesh belts 1, control the spacing of mesh belts 1, prevent materials from sticking to mesh belts 1, and provide a heating source. The number of mesh belts 1 layers is arranged on the integrated support frame 2 according to the loading amount requirements. The spacing between the mesh belts 1 between the layers is greater than the thickness of the fabric, and the mesh belts 1 between the layers are staggered in the horizontal direction to ensure that the upper mesh belt 1 directly falls on the lower mesh belt 1, and the material is turned over when falling, thereby improving the material drying efficiency. A scraper that is close to the mesh belt is provided at the lower end of one side of the falling direction of each layer of mesh belt 1 to prevent the material from sticking to the mesh belt 1. The hoist tray 4 and the hoist drive 5 cooperate to transfer the material from the bottom mesh belt 1 to the top mesh belt 1.

[0049] In the present invention, as one of the feasible ways, the mesh belt 1 is a dense mesh belt woven with crankshaft-type metal wires, and the material is a material that can withstand the use environment of 150°C ethanol vapor; the pitch of the mesh belt 1 is less than 8mm, and the mesh spacing is less than or equal to 3mm, ensuring that the material will not leak when drying on the mesh belt 1 and can be heated evenly; the mesh belt 1 adopts a double-pitch chain design; the overall length and width of the mesh belt 1 are designed according to the loading amount.

[0050] In the present invention, as one of the feasible ways, the material of the integrated support frame 2 is a material that can withstand the use environment of 150°C ethanol vapor.

[0051] In the present invention, as one of the feasible ways, the integrated support frame 2 is provided with multiple layers of transverse pallets through the support shaft; the number of layers of the transverse pallets is the same as the number of layers of the mesh belt 1 and is matched one by one, and the single-layer transverse pallet is arranged in the middle of the single-layer mesh belt 1; a heating source is arranged at the single-layer transverse pallet in the middle of the single-layer mesh belt on the integrated support frame 2; the single mesh belt driving mechanism 3 is connected to the matching single-layer mesh belt 1 through the transmission shaft to drive the single-layer mesh belt 1 to run.

[0052] In the present invention, as one possible implementation, the scraper is made of polytetrafluoroethylene or stainless steel.

[0053] In the present invention, as one of the achievable methods, the heating source is a heat transfer oil pipe or a heating wire.

[0054] In the present invention, as one of the feasible ways, the mesh belt driving mechanism 3 is a servo motor combined with a reducer structure.

[0055] In the present invention, as one of the feasible ways, the elevator material tray 4 includes a sprocket and a plurality of material trays densely arranged on the sprocket; the elevator material tray 4 is made of stainless steel, and the size of a single material tray is designed as needed; the material trays are densely arranged to ensure that no material is spilled when receiving the material; the elevator drive mechanism 5 is respectively connected to the single axis at the center of the upper end of each material tray, so that each material tray moves to the top of the elevator material tray 4 and then automatically flips and drops the material with the drive operation, thereby improving the material drying efficiency.

[0056] In the present invention, as one of the feasible ways, the elevator driving mechanism 5 is a servo motor and a reducer structure, the servo motor and the reducer drive the sprocket to move, and the movement direction of the sprocket is controlled by the gear of the sprocket; a horizontal moving area is set on the sprocket below the bottom mesh belt 1 to ensure that the material is received from the bottom mesh belt 1; a turning area is set on the sprocket above the top mesh belt 1 to ensure that the material falls to the top mesh belt 1.

[0057] The present invention also provides a matrix graphite powder wet material drying process, including material distribution, material movement control, material drying and ethanol recovery; the incoming material treated by the process is granulated matrix graphite powder wet material, and the material after the process treatment is granulated particles after the matrix graphite powder wet material is dried.

[0058] In the present invention, as one of the feasible ways, the cloth is laid in such a way that the incoming material is evenly distributed on the mesh belt 1 according to the set cloth thickness; the cloth thickness is calculated according to the incoming material quantity and the cloth area of ​​the mesh belt 1; the change of the set cloth thickness over time during the laying period is calculated according to the incoming material rate; and the change of the distance between the laying tooling and the mesh belt during the laying period and the final position are set according to the change of the cloth thickness and the thickness of the laying process over time.

[0059] In the present invention, as one of the achievable methods, the material movement control is to control the automatic transfer of the material between different layers of mesh belts 1 during the material drying process to turn the material over, thereby improving the material drying efficiency.

[0060] In the present invention, as one of the achievable methods, material movement control includes the following steps:

[0061] Set the movement direction of the mesh belt 1 and the elevator tray 4, where the movement direction of the odd-numbered mesh belt from top to bottom is to make the material move away from the elevator tray 4, and the movement direction of the even-numbered mesh belt from top to bottom is to make the material move toward the elevator tray 4. The movement direction of the elevator tray 4 is that after the bottom end of the elevator tray 4 receives the material, it moves from the side close to the mesh belt 1 to the top of the elevator tray 4;

[0062] The movement speed of the mesh belt 1 and the elevator tray 4 is set. The movement speed of the mesh belt 1 is set according to the servo motor speed and the reduction ratio of the reducer of the mesh belt driving mechanism 3 and the chain sprocket parameters of the mesh belt 1; the movement speed of the elevator tray 4 is set according to the servo motor speed and the reduction ratio of the reducer of the elevator driving mechanism 5, the chain sprocket parameters of the elevator tray 4, the cloth thickness, the volume of a single tray and the loading amount of a single tray;

[0063] During the material drying process, the mesh belt 1 and the elevator material tray 4 are started to move; when discharging the material, the movement direction of the lowest mesh belt 1 is changed, and the material is discharged from the side of the lowest mesh belt 1 away from the elevator material tray 4.

[0064] In the present invention, as one of the achievable methods, the material is dried by evaporating the ethanol in the wet material of the matrix graphite powder;

[0065] The material drying method uses the mold temperature controller as the heat source and the heat transfer oil as the heat transfer medium; the material drying includes: setting the heating temperature in the dryer to (75-105)°C, controlling the temperature uniformity by setting the heating area to ≤±1.0°C, the heating time to (6-20)h, and selecting the material feeding point or the material distribution completion point as the heating starting point;

[0066] Material movement control and ethanol recovery remain operational while the material is drying.

[0067] In the present invention, as one of the achievable methods, ethanol recovery is to re-condense and collect the ethanol evaporated from the wet material of the matrix graphite powder by two-stage condensation;

[0068] The first stage of condensation is chilled water condensation, the chilled water temperature is set to (5-10)°C, and the chilled water inlet pressure is >20kPa;

[0069] The second stage of condensation is refrigerant condensation, the refrigerant temperature is set to (-15~-30)℃, and the refrigerant inlet pressure is >20kPa;

[0070] After the material drying starts in the first stage of condensation, the vacuum equipment and ethanol recovery equipment are started. When the vacuum degree drops to 0.03MPa, the vacuum equipment is turned off. When the vacuum degree rises to 0.08MPa, the vacuum equipment is started. This cycle is repeated until the material drying is completed.

[0071] After the material drying begins in the second stage of condensation, the vacuum equipment and ethanol recovery equipment are started to add argon gas to the dryer. The vacuum degree is controlled at (0.05~0.08)MPa by controlling the argon gas replenishment rate and the vacuum pump valve opening until the material drying is completed.

[0072] Example 1

[0073] See also Figure 1 , this embodiment provides a matrix graphite powder wet material drying device, which can process 600kg of matrix graphite powder wet material in a single batch, including a mesh belt 1, an integrated support frame 2, a mesh belt driving mechanism 3, an elevator material tray 4 and an elevator driving mechanism 5;

[0074] Four layers of mesh belts 1 are arranged on the integrated support frame 2, the spacing between the mesh belts 1 between the layers is greater than the thickness of the cloth, and the mesh belts 1 between the layers are staggered in the horizontal direction; a scraper close to the mesh belt 1 is provided at the lower end of one side of the material dropping direction of each layer of mesh belt 1 on the integrated support frame 2; a heating source is provided in the middle of each layer of mesh belt 1 on the integrated support frame 2;

[0075] Four mesh belt drive mechanisms 3 are installed on the integrated support frame 2. The mesh belt drive mechanisms 3 are matched with the mesh belts 1 one by one. Each layer of the mesh belt 1 moves under the drive of the matched mesh belt drive mechanism 3.

[0076] Each layer of mesh belt 1 is used to move under the drive of its own matching mesh belt driving mechanism 3. The movement direction of the first layer of mesh belt 1 and the third layer of mesh belt 1 from top to bottom is opposite to that of the second layer of mesh belt 1 and the fourth layer of mesh belt 1, so as to realize the material receiving and dropping of each layer of mesh belt 1; the top layer of mesh belt 1 runs away from the elevator material tray 4 to realize material discharge;

[0077] The top of the elevator material tray 4 is above the material receiving position of the top mesh belt 1, and the bottom is below the material dropping position of the bottom mesh belt 1. It is used to move under the drive of the elevator drive mechanism 5 to receive materials from the bottom mesh belt 1 and drop materials to the top mesh belt 1.

[0078] In this embodiment, as one of the feasible methods, the mesh belt 1 is a dense mesh belt woven with crankshaft metal wire, the material is 316 stainless steel, the pitch is 7.5mm, and the mesh spacing is 3mm, to ensure that the material will not leak when drying on the mesh belt 1 and can be heated evenly; the mesh belt 1 adopts a double-pitch chain design; the overall length and width of the mesh belt 1 are designed according to the loading amount.

[0079] In this embodiment, as one of the feasible ways, the material of the integrated support frame 2 is 316 stainless steel; the integrated support frame 2 is provided with four layers of horizontal support plates through the support shaft, the single-layer horizontal support plate is arranged in the middle of the single-layer mesh belt 1, and a heating source is arranged at the single-layer horizontal support plate in the middle of the single-layer mesh belt on the integrated support frame 2; the single mesh belt driving mechanism 3 is connected with the matching single-layer mesh belt 1 through the transmission shaft to drive the single-layer mesh belt 1 to run; the designed cloth thickness is 120mm, the spacing between the mesh belts is 190mm, the effective width of the mesh belt is 750mm, the effective length of the mesh belt is 2100mm, and each layer of mesh belt is horizontally displaced by 300mm; the first and third layers of mesh belts 1 on the integrated support frame 2 from top to bottom near the lower end of the elevator end are provided with scrapers that are close to the mesh belts, and the second and fourth layers of mesh belts 1 on the integrated support frame 2 from top to bottom near the lower end of the elevator end are provided with scrapers that are close to the mesh belts to prevent materials from sticking to the mesh belts; the scraper material is polytetrafluoroethylene or stainless steel.

[0080] In this embodiment, as one of the feasible ways, the heating device is a heat transfer oil pipe.

[0081] In this embodiment, as one of the feasible ways, the mesh belt driving mechanism 3 is a servo motor with a reducer structure.

[0082] In the present embodiment, as one of the feasible ways, the elevator tray 4 is made of stainless steel, and the volume of a single tray is 7L; the elevator tray 4 includes a sprocket and a plurality of trays densely arranged on the sprocket, and the trays are densely arranged to ensure that no material is spilled when receiving the material; the elevator drive mechanism 5 is respectively connected to the single axis at the center of the upper end of each tray, so that each tray moves to the top of the elevator tray and then automatically flips and drops the material with the drive operation, thereby improving the material drying efficiency.

[0083] In this embodiment, as one of the feasible methods, the elevator driving mechanism 5 is a servo motor and a reducer structure, the servo motor and the reducer drive the sprocket to move, and the movement direction of the sprocket is controlled by the gears of the sprocket; a horizontal moving area is set on the sprocket below the bottom mesh belt 1 to ensure that the material is received from the bottom mesh belt 1; a turning area is set on the sprocket above the top mesh belt 1 to ensure that the material falls to the top mesh belt 1.

[0084] This embodiment also provides a matrix graphite powder wet material drying process, comprising the following steps:

[0085] 1. Set the movement direction of the mesh belt 1 and the elevator tray 4, wherein the movement direction of the first layer mesh belt 1 and the third layer mesh belt 1 from top to bottom is to move the material away from the elevator tray 4, and the movement direction of the second layer mesh belt 1 and the fourth layer mesh belt 1 from top to bottom is to move the material toward the elevator tray 4; the movement direction of the elevator tray 4 is that after the bottom end of the elevator tray 4 receives the material, it moves from the side close to the mesh belt 1 to the top of the elevator tray 4;

[0086] 2. According to the servo motor speed and reducer ratio of the mesh belt drive mechanism 3 and the chain sprocket parameters of the mesh belt 1, the movement speed of the mesh belt 1 is set to 75mm / min. According to the servo motor speed and reducer ratio of the elevator drive mechanism 5, the chain sprocket parameters of the elevator tray 4, the cloth thickness, the volume of a single tray 7L and 50% loading of a single tray, the movement speed of the elevator tray 4 is set to 150mm / min;

[0087] 3. Start the movement of mesh belt 1 and elevator tray 4;

[0088] 4. A single batch of materials is processed with 600 kg and the feeding time is 2 hours. Based on this, the set thickness of the cloth is calculated to be 120 mm, and the thickness variation is 1 mm / min. The starting distance between the cloth tooling and mesh belt 1 is set to 20 mm, and the starting point of the cloth is the material feeding point. 20 minutes after the start of the cloth, the cloth tooling is lifted up at a speed of 1 mm / min, and the lifting end point is when the distance between the cloth tooling and the mesh belt reaches 120 mm, and the cloth is completed. The cloth tooling position is maintained until the material is dried.

[0089] 5. Start heating, and the heat transfer oil in the heat transfer oil pipe at the horizontal support plate of the integrated support frame 2 begins to heat;

[0090] 6. The mold temperature controller is set to 100°C. After the fabric is finished, start heating. After the temperature in the dryer reaches 90°C, control the mold temperature controller to maintain the temperature in the dryer. The insulation time is set to 6 hours.

[0091] 7. After heating is started, start the vacuum equipment and ethanol recovery equipment. When the vacuum degree drops to 0.03MPa, turn off the vacuum equipment. When the vacuum degree rises to 0.08MPa, start the vacuum equipment. Repeat this cycle until the drying is completed.

[0092] 8. After the insulation is completed, turn off the vacuum equipment and ethanol recovery device, fill the dryer with protective gas until positive pressure; change the movement direction of the bottom mesh belt 1, and discharge the material from the side of the lowest mesh belt away from the elevator material tray 4;

[0093] 9. When discharging is completed, turn off the equipment and end the process.

[0094] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A matrix graphite powder wet material drying device, characterized in that: It comprises a mesh belt (1), an integrated support frame (2), a mesh belt driving mechanism (3), an elevator material tray (4) and an elevator driving mechanism (5); Multiple layers of mesh belts (1) are arranged on the integrated support frame (2), the mesh belts (1) are spaced apart from each other by a distance greater than the thickness of the cloth, and the mesh belts are staggered in the horizontal direction; a scraper is provided at the lower end of each layer of mesh belts (1) on the integrated support frame (2) on one side of the material dropping direction, and a heating source is provided in the middle of each layer of mesh belts (1) on the integrated support frame (2); A plurality of mesh belt drive mechanisms (3) are installed on the integrated support frame (2), the number of the mesh belt drive mechanisms (3) is the same as the number of layers of the mesh belt (1) and they are matched one by one, and each layer of the mesh belt (1) moves under the drive of its own matched mesh belt drive mechanism (3); The mesh belt (1) has an even number of layers, and each layer of the mesh belt (1) is used to move under the drive of a mesh belt driving mechanism (3) matched with the mesh belt. The mesh belts (1) with an odd number of layers move in opposite directions to the mesh belts (1) with an even number of layers, so as to realize the material receiving and material dropping of each layer of the mesh belts (1). The mesh belt (1) at the top layer moves in a direction away from the material tray (4) of the elevator, so as to realize the material discharge. The top end of the elevator material tray (4) is above the material receiving position of the top mesh belt (1), and the bottom end is below the material dropping position of the bottom mesh belt (1). The elevator material tray (4) is driven by the elevator driving mechanism (5) to move, so as to receive the material from the bottom mesh belt (1) and drop the material to the top mesh belt (1).

2. The matrix graphite powder wet material drying device according to claim 1, characterized in that: The mesh belt (1) is a dense mesh belt woven with crankshaft-type metal wires, and is made of a material that can withstand the use environment of 150°C ethanol vapor; the pitch of the mesh belt (1) is less than 8mm, and the mesh spacing is less than or equal to 3mm; the mesh belt (1) adopts a double-pitch chain design.

3. The matrix graphite powder wet material drying device according to claim 1, characterized in that: The material of the integrated support frame (2) is a material that can withstand an ethanol vapor usage environment at 150°C; the integrated support frame (2) is provided with multiple layers of transverse support plates through a support shaft; the number of transverse support plates is the same as the number of mesh belts (1) and is matched one by one, and a single-layer transverse support plate is arranged in the middle of the single-layer mesh belt (1); a heating source is arranged at the single-layer transverse support plate in the middle of the single-layer mesh belt on the integrated support frame (2); a single mesh belt driving mechanism (3) is connected to a matching single-layer mesh belt (1) through a transmission shaft to drive the single-layer mesh belt (1) to run; the mesh belt driving mechanism (3) is a servo motor with a reducer structure.

4. The matrix graphite powder wet material drying device according to claim 1, characterized in that: The elevator material tray (4) includes a sprocket and a plurality of material trays densely arranged on the sprocket; the elevator driving mechanism (5) is connected to each material tray at the center of the upper end of a single shaft; the elevator driving mechanism (5) is a servo motor and a reducer structure, the servo motor and the reducer drive the sprocket to move, and the movement direction of the sprocket is controlled by the gear of the sprocket; a horizontal moving area is set on the sprocket below the bottom mesh belt (1); and a turning area is set on the sprocket above the top mesh belt (1).

5. A process for drying wet material of matrix graphite powder, characterized in that: It includes material distribution, material movement control, material drying and ethanol recovery; the incoming material for process treatment is the granulated matrix graphite powder wet material, and the material after process treatment is the granulated particles after the matrix graphite powder wet material is dried.

6. The process for drying wet graphite powder matrix according to claim 5, characterized in that: The method comprises the following steps: the incoming material is evenly distributed on the mesh belt (1) according to the set material thickness; the material thickness is calculated according to the incoming material amount and the material area of ​​the mesh belt (1); the change of the set material thickness over time during the material distribution period is calculated according to the incoming material rate; and the change of the distance between the material distribution tool and the mesh belt during the material distribution period and the final position are set according to the change of the material thickness and the material distribution process thickness over time.

7. The process for drying wet graphite powder matrix according to claim 5, characterized in that: The material movement control is to control the automatic transfer of the material between different layers of mesh belts (1) during the material drying process to turn the material over.

8. The process for drying wet graphite powder matrix according to claim 7, characterized in that: Material movement control includes the following steps: The movement directions of the mesh belt (1) and the elevator material tray (4) are set, wherein the movement direction of the mesh belt of odd number layers from top to bottom is to make the material move in a direction away from the elevator material tray (4), and the movement direction of the mesh belt of even number layers from top to bottom is to make the material move in a direction close to the elevator material tray (4), and the movement direction of the elevator material tray (4) is to move from the side close to the mesh belt (1) to the top of the elevator material tray (4) after the bottom end of the elevator material tray (4) receives the material; The movement speeds of the mesh belt (1) and the elevator tray (4) are set. The movement speed of the mesh belt (1) is set according to the rotation speed of the servo motor and the reduction ratio of the reducer of the mesh belt driving mechanism (3) and the chain sprocket parameters of the mesh belt (1); the movement speed of the elevator tray (4) is set according to the rotation speed of the servo motor and the reduction ratio of the reducer of the elevator driving mechanism (5), the chain sprocket parameters of the elevator tray (4), the material thickness, the volume of a single tray and the loading amount of a single tray; During the material drying process, the mesh belt (1) and the elevator material tray (4) are started to move; when discharging the material, the movement direction of the lowest mesh belt (1) is changed, and the material is discharged from the side of the lowest mesh belt (1) away from the elevator material tray (4).

9. The process for drying wet graphite powder matrix according to claim 5, characterized in that: The material is dried by evaporating the ethanol in the wet material of the matrix graphite powder; the material is dried by using a mold temperature controller as a heat source and heat transfer oil as a heat transfer medium; Material drying includes the following steps: setting the heating temperature in the dryer to (75-105)°C, controlling the temperature uniformity to ≤±1.0°C by setting the heating area, the heating time to (6-20)h, and selecting the material feeding point or the material distribution completion point as the heating starting point; Material movement control and ethanol recovery remain operational while the material is drying.

10. The process for drying wet graphite powder matrix according to claim 5, characterized in that: Ethanol recovery is to re-condense and collect the ethanol evaporated from the wet material of the matrix graphite powder by two-stage condensation; The first stage of condensation is chilled water condensation, the chilled water temperature is set to (5-10)°C, and the chilled water inlet pressure is >20kPa; The second stage of condensation is refrigerant condensation, the refrigerant temperature is set to (-15~-30)℃, and the refrigerant inlet pressure is >20kPa; The first stage of condensation is after the material drying begins, and includes the following steps: start the vacuum equipment and ethanol recovery equipment, shut down the vacuum equipment when the vacuum degree drops to 0.03MPa, and start the vacuum equipment when the vacuum degree rises to 0.08MPa, and repeat this cycle until the material drying is completed; The second stage of condensation is after the material drying begins, and includes the following steps: starting the vacuum equipment and ethanol recovery equipment, adding argon gas to the dryer, and controlling the vacuum degree at (0.05-0.08) MPa by controlling the argon gas replenishment rate and the vacuum pump valve opening until the material drying is completed.

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