Preparation method of nuclear power cable insulation material

Abstract

The invention discloses a preparation method of a nuclear power cable insulation material, and relates to the field of preparation of cable insulation materials. According to the preparation method of the nuclear power cable insulation material, an extruder main body, a machine barrel, a feeding seat, a feeding hopper, a stirring barrel, a transmission unit and a stirring frame are included. According to the preparation method of the nuclear power cable insulation material, under the action of the transmission unit, the stirring frame stirs and mixes the raw materials in the stirring barrel, so that the raw materials are effectively mixed, the proportion of the raw materials entering the machine barrel subsequently is within a set proportion range, the mixing uniformity of the raw materials in the machine barrel is ensured, and the production efficiency is improved. By controlling the quantity of the raw materials in the stirring barrel, the mixing of the raw materials is effectively improved, so that the mixing is more uniform, the primary mixing effect is ensured, the raw materials are crushed and mixed through the machine barrel, the mixing effect is better, and the product production effect is improved.

Description

Technical Field

[0001] This invention relates to the field of cable insulation material preparation technology, specifically a method for preparing nuclear power cable insulation material. Background Technology

[0002] Cable insulation material is used to wrap the conductors of wires and cables to prevent current leakage and short circuits. The preparation method of cable insulation material varies depending on the type of material, and usually includes steps such as raw material preparation, mixing and plasticizing, and extrusion granulation.

[0003] During the preparation process, the formulation of raw materials and process parameters need to be adjusted according to different product requirements to ensure that the performance and quality of the final product meet the requirements. In the processing of cable insulation materials, the raw materials need to be mixed and plasticized, and then extruded by a granulator. In the existing technology, the raw materials are fed into the granulator for uniform mixing. However, due to the need for continuous feeding, multiple raw materials are mixed in the hopper, resulting in different proportions of raw materials entering the granulator. This leads to the product produced in the granulator not achieving the best effect. Therefore, we propose a preparation method for nuclear power cable insulation materials. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for preparing nuclear power cable insulation material. This method solves the problem that when mixing raw materials, the raw materials are fed into a granulator for uniform mixing. However, due to the need for continuous feeding, multiple raw materials are mixed in the hopper, resulting in different proportions of raw materials entering the granulator. Consequently, the product produced in the granulator cannot achieve optimal quality.

[0005] To achieve the above objectives, the present invention provides a method for preparing insulation material for nuclear power cables, comprising the following steps: S1: Raw material mixing: According to the production requirements and the predetermined formula material ratio, accurately weigh and mix all raw materials evenly. S2: Melt extrusion: The uniformly mixed raw materials are fed into a twin-screw extruder for melt extrusion. During the extrusion process, the raw materials are subjected to high temperature and high shear force, and at the same time, they are combined with the feeding die and the forming die to form a uniform melt, which is then extruded into granules through the die. S3: Plasticizing and Flake Extrusion: The extruded granules are plasticized and extruded into flakes on an open mill. S4: Hydraulic forming: The sheet material is placed in a hydraulic press and subjected to steps such as preheating under pressure, heating under pressure, and cooling under pressure to obtain the desired test piece shape; S5: Irradiation crosslinking: The molded specimens are subjected to irradiation crosslinking treatment. The irradiation dose needs to be adjusted according to the specific materials and formulations. When manufacturing nuclear power cable insulation material using the above steps, the specific equipment involved in preparing nuclear power cable insulation material includes: The main body of the extruder includes a barrel, a feed seat, a feed hopper, and a mixing drum; The barrel is located in the main body of the extruder and is used to crush, soften, melt, plasticize, degas and compact the raw materials, and to continuously and uniformly convey the rubber material to the molding system; The feed seat is located at one end of the barrel and is used to communicate with the barrel; The feed hopper is located above the feed seat and is used to feed materials in conjunction with the feed seat; The mixing drum is located in the feed seat and is used to mix the raw materials entering the feed seat from the feed hopper; The transmission unit, located on the feed seat, is used to cooperate in stirring the raw materials in the mixing drum; The mixing rack is positioned at the center of the mixing drum and is used to work with the transmission unit to mix the raw materials.

[0006] Preferably, the barrel is mounted on the extruder body, and the feed seat is fixedly connected to the barrel.

[0007] Preferably, the feed hopper is fixedly connected to the feed seat, and the feed hopper is provided with multiple feed ports for the entry of various raw materials. A conical disc is fixedly connected below the feed hopper, and the raw materials are transported to the mixing drum through the conical disc.

[0008] Preferably, a connecting cylinder is fixedly connected to the top end face of the mixing drum. The connecting cylinder is used to cooperate with the conical disc to close and open the feed hopper, thereby controlling the amount of raw material in the mixing drum.

[0009] Preferably, an extrusion unit is provided below the connecting cylinder. The extrusion unit is used to drive the stirring cylinder and the connecting cylinder to move, and works with the conical disc to limit the amount of raw material in the stirring cylinder. The extrusion unit includes: Multiple sliding rods are slidably connected to the inner wall of the feed seat, and the sliding rods are fixedly connected to the top of the connecting cylinder.

[0010] Preferably, the sliding rods are evenly distributed below the connecting cylinder, and a fixed seat is fixedly connected to the bottom end face of the sliding rod. A spring is sleeved on the outer peripheral wall of the sliding rod, and the two ends of the spring are fixedly connected to the connecting cylinder and the fixed seat respectively. The spring is used to limit the position of the stirring cylinder and the connecting cylinder.

[0011] Preferably, the transmission unit includes: From bevel gears; The main bevel gear meshes with the driven bevel gear, and drives the main bevel gear to rotate through the driven bevel gear; A rotating shaft is inserted into the inner wall of the main bevel gear. The rotating shaft is rotatably connected to the inner wall of the feed seat and is used to drive the main bevel gear to rotate.

[0012] Preferably, a connecting frame is fixedly connected to the inner wall of the bevel gear, and a stirring frame is fixedly connected to the bottom end face of the connecting frame. The connecting frame drives the stirring frame to rotate, and the stirring frame stirs the raw materials in the stirring drum.

[0013] Preferably, a transmission wheel is sleeved at one end of the rotating shaft outside the feed seat. The transmission wheel is connected to the drive mechanism via a transmission belt and is used to drive the main bevel gear and the driven bevel gear to rotate.

[0014] This invention discloses a method for preparing insulation material for nuclear power cables, which has the following beneficial effects: The method for preparing the insulation material for nuclear power cables involves a drive mechanism that rotates a transmission wheel, which in turn rotates a rotating shaft. This rotation of the shaft causes the main bevel gear to rotate within the feed seat, which in turn drives the driven bevel gear to rotate. The driven bevel gear then drives the connecting frame to rotate, causing the stirring frame on the connecting frame to rotate as well. This stirring frame effectively mixes the raw materials in the mixing drum, ensuring that the proportion of subsequent raw materials entering the drum remains within a set range. This guarantees the uniformity of the mixture within the drum and improves the quality of the produced product.

[0015] The method for preparing the insulation material for nuclear power cables involves sliding a mixing drum and a connecting drum, with the connecting drum engaging with a conical disc. Furthermore, when the connecting drum and the conical disc are in contact, they seal the feed hopper, limiting the amount of raw material entering the mixing drum and controlling the amount of raw material in the mixing drum. This effectively improves the mixing of the raw materials, making the mixture more uniform and ensuring the initial mixing effect. The raw materials are then further crushed and mixed using a machine drum, resulting in a better mixing effect and improved product quality.

[0016] The method for preparing the insulation material for nuclear power cables involves a feeding hopper with multiple inlets for feeding various raw materials in different proportions. The raw materials in different proportions are then fed into the feeding hopper. A conical disc is fixedly connected to the bottom of the feeding hopper, through which the raw materials are transported to a mixing drum, so that the raw materials are mixed in proportion in the mixing drum. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram showing the connection between the feed seat and the feed hopper of the present invention; Figure 3 This is a schematic diagram of the internal structure of the feed seat of the present invention; Figure 4 This is a schematic diagram of the transmission unit structure of the present invention; Figure 5 This is a schematic diagram showing the connection between the stirring cylinder and the extrusion unit of the present invention; Figure 6 This is a schematic diagram of the extrusion unit structure of the present invention.

[0019] In the diagram: 1. Extruder body; 2. Barrel; 3. Feed seat; 4. Feed hopper; 401. Conical disc; 5. Mixing cylinder; 501. Connecting cylinder; 6. Transmission unit; 601. Driven bevel gear; 602. Main bevel gear; 603. Rotating shaft; 604. Transmission wheel; 605. Connecting frame; 7. Extrusion unit; 701. Sliding rod; 702. Fixed seat; 703. Spring; 8. Mixing frame. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This application provides a method for preparing nuclear power cable insulation material, which solves the problem that when mixing raw materials, the raw materials are fed into a granulator for uniform mixing. However, due to the need for continuous feeding, multiple raw materials are mixed in the hopper, resulting in different proportions of raw materials entering the granulator. This leads to suboptimal product quality. The method solves this problem by using a sliding mechanism between the mixing drum 5 and the connecting drum 501. The connecting drum 501 engages with the conical disc 401. Furthermore, when the connecting drum 501 and the conical disc 401 are in contact, they seal the feed hopper 4, limiting the amount of raw material entering the mixing drum 5. This controls the amount of raw material in the mixing drum 5, effectively improving the mixing of raw materials and making the mixing more uniform. This ensures the initial mixing effect, and the raw materials are then crushed and mixed by the machine barrel 2, resulting in better mixing and improved product quality. When the drive mechanism drives the transmission wheel 604 to rotate, the transmission wheel 604 drives the rotating shaft 603 to rotate accordingly. The rotation of the rotating shaft 603 causes the main bevel gear 602 to rotate in the feed seat 3. At this time, the main bevel gear 602 drives the driven bevel gear 601 to rotate, which in turn drives the connecting frame 605 to rotate. The stirring frame 8 on the connecting frame 605 then rotates accordingly. The stirring frame 8 stirs and mixes the raw materials in the mixing drum 5, thereby effectively mixing the raw materials. This ensures that the proportion of raw materials entering the machine drum 2 is within the set range, guaranteeing the uniformity of the raw material mixing in the machine drum 2, and thus improving the product production effect.

[0022] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0023] This invention discloses a method for preparing insulation material for nuclear power cables.

[0024] Example 1:

[0025] According to the appendix Figure 1-6 As shown, the following operation steps are included: S1: Raw material mixing: According to the production requirements and the predetermined formula material ratio, various raw materials are accurately weighed and mixed evenly, usually in a high-speed mixer or internal mixer.

[0026] S2: Melt Extrusion: The uniformly mixed raw materials are fed into a twin-screw extruder for melt extrusion. During the extrusion process, the raw materials are subjected to high temperature and high shear force, and at the same time, they are combined with the feeding die and the forming die to form a uniform melt, which is then extruded into granules through the die.

[0027] S3: Plasticizing and Flakes: The extruded granules are plasticized and sheeted on an open mill. The temperature of the open mill needs to be controlled within an appropriate range to ensure the quality of material plasticization and sheeting.

[0028] S4: Hydraulic forming: The sheet material is placed in a hydraulic press and subjected to steps such as preheating under pressure, heating under pressure, and cooling under pressure to obtain the required test piece shape. The temperature and pressure of the hydraulic press need to be precisely controlled to ensure the forming quality and performance of the material.

[0029] S5: Irradiation crosslinking: The molded specimens are subjected to irradiation crosslinking treatment. The irradiation dose needs to be adjusted according to the specific materials and formulations. Irradiation crosslinking can further improve the mechanical properties, heat resistance and flame retardant properties of the materials.

[0030] The manufacturing of nuclear power cable insulation material using the above steps also involves nuclear power cable insulation material preparation equipment, including: The main body of the extruder 1 includes a barrel 2, a feed seat 3, a feed hopper 4, and a mixing drum 5; The barrel 2 is set in the main body 1 of the extruder and is used to crush, soften, melt, plasticize, degas and compact the raw material, and to continuously and uniformly convey the rubber material to the molding system; The feed seat 3 is located at one end of the barrel 2 and is used to communicate with the barrel 2; The feed hopper 4 is located above the feed seat 3 and is used to cooperate with the feed seat 3 for feeding. The mixing drum 5 is located in the feed seat 3 and is used to mix the raw materials that enter the feed seat 3 from the feed hopper 4; The transmission unit 6 is located on the feed seat 3 and is used to cooperate in stirring the raw materials in the mixing drum 5. The stirring rack 8 is positioned at the center of the stirring drum 5 and is used to work with the transmission unit 6 to stir and mix the raw materials.

[0031] The barrel 2 is installed on the extruder body 1, and the feed seat 3 is fixedly connected to the barrel 2. Specifically, the mixed raw materials are conveyed into the barrel 2 through the feed seat 3. The screw in the barrel 2 is driven to rotate by the drive mechanism on the extruder body 1, which crushes, softens, melts, plasticizes, degasses and compacts the raw materials, and continuously and evenly conveys the rubber material to the molding system. After being further crushed by the grinding disc, the raw materials enter the extrusion screw section. The feeding die and the forming die are installed below the extrusion screw. The raw materials enter the forming die from the tail of the extrusion screw to form the final product.

[0032] The feed hopper 4 is fixedly connected to the feed seat 3. The feed hopper 4 is provided with multiple feed ports for the entry of various raw materials, which facilitates the feeding of various raw materials in different proportions. The raw materials in different proportions then enter the feed hopper 4. A conical disc 401 is fixedly connected to the bottom of the feed hopper 4. The raw materials are conveyed to the mixing drum 5 through the conical disc 401, so that the raw materials are mixed in the mixing drum 5 in proportion. Specifically disclosed, the raw materials enter the feed hopper 4 through the feed port on the feed hopper 4. The raw materials enter according to the specified ratio and fall into the conical plate 401. The inclined surface of the conical plate 401 transports the raw materials to the mixing drum 5. In the mixing drum 5, the mixing rack 8 stirs the raw materials to make them evenly mixed.

[0033] A connecting cylinder 501 is fixedly connected to the top end face of the mixing drum 5. The connecting cylinder 501 is used to cooperate with the conical disc 401 to close and open the feed hopper 4, and to control the amount of raw material in the mixing drum 5. It is particularly important to emphasize that by controlling the amount of raw materials in the mixing drum 5, the mixing of raw materials can be effectively improved, making the mixing more uniform and ensuring the effect of the initial mixing. Then, the raw materials are crushed and mixed by the drum 2, which has a better mixing effect and improves the production effect.

[0034] An extrusion unit 7 is provided below the connecting cylinder 501. The extrusion unit 7 is used to drive the stirring cylinder 5 and the connecting cylinder 501 to move, and works with the conical disc 401 to limit the amount of raw material in the stirring cylinder 5. The extrusion unit 7 includes: Multiple sliding rods 701 are slidably connected to the inner wall of the feed seat 3. The sliding rods 701 are fixedly connected to the top of the connecting cylinder 501. The sliding rods 701 are used to adjust the sliding of the connecting cylinder 501 and the mixing cylinder 5 in the feed seat 3 to be relatively stable. By sliding the mixing cylinder 5 and the connecting cylinder 501, the connecting cylinder 501 cooperates with the conical disk 401. Furthermore, when the connecting cylinder 501 and the conical disk 401 are in contact, the connecting cylinder 501 and the conical disk 401 seal the feed hopper 4, limiting the raw material in the feed hopper 4 from entering the mixing cylinder 5.

[0035] Sliding rods 701 are evenly distributed below the connecting cylinder 501. A fixed seat 702 is fixedly connected to the bottom end face of the sliding rods 701. A spring 703 is sleeved on the outer peripheral wall of the sliding rods 701. The two ends of the spring 703 are fixedly connected to the connecting cylinder 501 and the fixed seat 702 respectively. The spring 703 is used to limit the position of the stirring cylinder 5 and the connecting cylinder 501. Furthermore, when the raw material in the mixing drum 5 enters the machine drum 2, the mixing drum 5, under the rebound of the spring 703, pushes the mixing drum 5 and the connecting drum 501 upward, causing the connecting drum 501 to separate from the conical disc 401. At this time, the raw material in the feed hopper 4 enters the connecting drum 501 and the mixing drum 5, and then the raw material enters the mixing drum 5 for mixing.

[0036] Example 2:

[0037] Transmission unit 6 includes: From bevel gear 601; The main bevel gear 602 meshes with the driven bevel gear 601, and the driven bevel gear 601 drives the main bevel gear 602 to rotate. The rotating shaft 603 is inserted into the inner wall of the main bevel gear 602. The rotating shaft 603 is rotatably connected to the inner wall of the feed seat 3. The rotating shaft 603 is used to drive the main bevel gear 602 to rotate.

[0038] A connecting frame 605 is fixedly connected to the inner wall of the bevel gear 601. A stirring frame 8 is fixedly connected to the bottom end face of the connecting frame 605. The connecting frame 605 drives the stirring frame 8 to rotate, and the stirring frame 8 stirs the raw materials in the stirring drum 5. Specifically disclosed, the main bevel gear 602 rotates in the feed seat 3 under the rotation of the rotating shaft 603. At this time, the main bevel gear 602 drives the secondary bevel gear 601 to rotate, and the secondary bevel gear 601 drives the connecting frame 605 to rotate. At this time, the stirring frame 8 on the connecting frame 605 rotates accordingly. Furthermore, at this time, the stirring rack 8 stirs and mixes the raw materials in the stirring drum 5, thereby effectively mixing the raw materials and ensuring that the proportion of subsequent raw materials entering the machine drum 2 is within the set ratio range, thus ensuring the uniformity of the raw material mixing in the machine drum 2 and improving the product production effect.

[0039] A transmission wheel 604 is sleeved at one end of the rotating shaft 603 outside the feed seat 3. The transmission wheel 604 is connected to the drive mechanism through a transmission belt and is used to drive the main bevel gear 602 and the driven bevel gear 601 to rotate. When the drive mechanism drives the transmission wheel 604 to rotate, the transmission wheel 604 drives the rotating shaft 603 to rotate accordingly. At this time, the rotating shaft 603 drives the main bevel gear 602 and the driven bevel gear 601 to rotate.

[0040] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing insulation material for nuclear power cables, characterized in that, The following steps are included: S1: Raw material mixing: According to the production requirements and the predetermined formula material ratio, accurately weigh and mix all raw materials evenly. S2: Melt extrusion: The uniformly mixed raw materials are fed into a twin-screw extruder for melt extrusion. During the extrusion process, the raw materials are subjected to high temperature and high shear force, and at the same time, they are combined with the feeding die and the forming die to form a uniform melt, which is then extruded into granules through the die. S3: Plasticizing and Flake Extrusion: The extruded granules are plasticized and extruded into flakes on an open mill. S4: Hydraulic forming: The sheet material is placed in a hydraulic press and subjected to steps such as preheating under pressure, heating under pressure, and cooling under pressure to obtain the desired test piece shape; S5: Irradiation crosslinking: The molded specimens are subjected to irradiation crosslinking treatment. The irradiation dose needs to be adjusted according to the specific materials and formulations. The manufacturing of nuclear power cable insulation material using the above steps also involves nuclear power cable insulation material preparation equipment, including: The main body of the extruder (1) includes a barrel (2), a feed seat (3), a feed hopper (4) and a mixing drum (5); The barrel (2) is set in the body of the extruder (1) for crushing, softening, melting, plasticizing, venting and compacting the raw material, and for continuously and uniformly conveying the rubber material to the molding system; The feed seat (3) is located at one end of the barrel (2) and is used to communicate with the barrel (2); The feed hopper (4) is located above the feed seat (3) and is used to feed materials in conjunction with the feed seat (3); The mixing drum (5) is located in the feed seat (3) and is used to mix the raw materials entering the feed seat (3) from the feed hopper (4); The transmission unit (6) is located on the feed seat (3) and is used to cooperate in stirring the raw materials in the mixing drum (5); The stirring rack (8) is set at the center of the stirring drum (5) and is used to cooperate with the transmission unit (6) to stir and mix the raw materials.

2. The method for preparing a nuclear power cable insulation material according to claim 1, characterized in that, The barrel (2) is mounted on the extruder body (1), and the feed seat (3) is fixedly connected to the barrel (2).

3. The method for preparing a nuclear power cable insulation material according to claim 1, characterized in that, The feed hopper (4) is fixedly connected to the feed seat (3). The feed hopper (4) is provided with multiple feed ports for the entry of various raw materials. A conical disc (401) is fixedly connected below the feed hopper (4), and the raw materials are transported to the mixing drum (5) through the conical disc (401).

4. The method for preparing a nuclear power cable insulation material according to claim 3, characterized in that, The top end face of the mixing drum (5) is fixedly connected to a connecting cylinder (501). The connecting cylinder (501) is used to cooperate with the conical disc (401) to close and open the feed hopper (4) and to control the raw material in the mixing drum (5).

5. The method for preparing a nuclear power cable insulation material according to claim 4, characterized in that, A pressing unit (7) is provided below the connecting cylinder (501). The pressing unit (7) is used to drive the stirring cylinder (5) and the connecting cylinder (501) to move, and cooperates with the conical disc (401) to limit the amount of raw material in the stirring cylinder (5). The pressing unit (7) includes: Multiple sliding rods (701) are slidably connected to the inner wall of the feed seat (3), and the sliding rods (701) are fixedly connected to the top of the connecting cylinder (501).

6. The method for preparing a nuclear power cable insulation material according to claim 5, characterized in that, The sliding rods (701) are evenly distributed below the connecting cylinder (501). The bottom end face of the sliding rod (701) is fixedly connected to the fixing seat (702). A spring (703) is sleeved on the outer peripheral wall of the sliding rod (701). The two ends of the spring (703) are fixedly connected to the connecting cylinder (501) and the fixing seat (702) respectively. The spring (703) is used to limit the position of the stirring cylinder (5) and the connecting cylinder (501).

7. The method for preparing a nuclear power cable insulation material according to claim 1, characterized in that, The transmission unit (6) includes: From bevel gear (601); The main bevel gear (602) meshes with the driven bevel gear (601), and the driven bevel gear (601) drives the main bevel gear (602) to rotate. A rotating shaft (603) is inserted into the inner wall of the main bevel gear (602). The rotating shaft (603) is rotatably connected to the inner wall of the feed seat (3). The rotating shaft (603) is used to drive the main bevel gear (602) to rotate.

8. The method for preparing a nuclear power cable insulation material according to claim 7, characterized in that, A connecting frame (605) is fixedly connected to the inner wall of the bevel gear (601), and a stirring frame (8) is fixedly connected to the bottom end face of the connecting frame (605). The connecting frame (605) drives the stirring frame (8) to rotate, and the stirring frame (8) stirs the raw materials in the stirring drum (5).

9. A method for preparing a nuclear power cable insulation material according to claim 8, characterized in that, The rotating shaft (603) is fitted with a transmission wheel (604) at one end outside the feed seat (3). The transmission wheel (604) is connected to the drive mechanism through a transmission belt and is used to drive the main bevel gear (602) and the driven bevel gear (601) to rotate.

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