CN112497596B - Gradient structure non-porous three-post insulator rotary pouring forming device and process - Google Patents
Gradient structure non-porous three-post insulator rotary pouring forming device and process Download PDFInfo
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- CN112497596B CN112497596B CN202011418560.0A CN202011418560A CN112497596B CN 112497596 B CN112497596 B CN 112497596B CN 202011418560 A CN202011418560 A CN 202011418560A CN 112497596 B CN112497596 B CN 112497596B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/10—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/24—Feeding the material into the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/42—Casting under special conditions, e.g. vacuum
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
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Abstract
The invention relates to the field of manufacturing of ultrahigh-voltage power transmission equipment, and provides a gradient-structure imperforate three-post insulator rotary pouring forming device and a process, wherein the device comprises a bi-component quantitative feeding system, a self-heating mould, a central rotating shaft, a negative pressure system and a control system; the two-component quantitative feeding system outputs an epoxy resin mixture with the filler concentration changing along with time to the self-heating mould; the self-heating mould can be tightly attached to the central rotating shaft to heat, cure and form the epoxy resin mixture; the negative pressure system enables the self-heating mould to form negative pressure; the control system controls the feeding, forms negative pressure and rotates the central rotating shaft. The invention can realize the gradient change of the dielectric constant of the three-post insulator along the radial direction of the post, can freely set the regulation and control capability of the three-post insulator on an electric field, realizes the integrated manufacturing of the controllability and the shape control, and avoids the flashover along the surface; the method can avoid pores generated by air bubbles in the casting process, ensure the mechanical performance of the three-post insulator, can realize batch casting, and realize large-scale benefits.
Description
Technical Field
The invention relates to the field of manufacturing of ultrahigh-voltage power transmission equipment, in particular to a gradient structure imperforate three-post insulator rotary pouring forming device and process.
Background
The gas insulated metal sealing technology (GIL and GIS) is the highest reliability technology for realizing long-distance ultrahigh voltage power transmission at present, and an epoxy cast three-pillar insulator plays an important role in the field of ultrahigh voltage power transmission as an insulating support component of a metal conductor in the technology.
At present, the research on the epoxy resin cast three-post insulator mainly focuses on the simplification of the preparation process and the enhancement of the use function through the optimization of the part structure, namely the shape control method. For example, CN102886851B discloses a three-pillar casting mold, which makes mold loading and unloading more convenient, and improves the casting efficiency and molding quality of the mold; for another example, CN207250241U discloses a dumbbell-type three-pillar support insulator for extra/extra-high voltage GIL, which reduces the possibility of failure of the metal insert at the low-voltage side and improves the service safety of parts.
However, the single structure optimization cannot completely avoid the occurrence of faults, most prominently, the homogeneous material causes electric field concentration, so that the insulator surface flashover is frequent, further, the problem of breakdown damage is developed, and the development of the ultrahigh voltage power transmission equipment is greatly limited. Aiming at the current situation, the most potential solution at present is to design an insulator with a gradient structure, so that the insulator material has different dielectric constants in space, the electric field distribution of a gas-solid interface is actively regulated and controlled, and the electric strength is improved. The method starts from changing the material of the insulating part, belongs to the technology of 'controllability', can be superposed and used together with the method, can realize 'controllability and row control integration' manufacturing, and greatly overcomes the problem of electric field distribution concentration.
The most common methods for preparing gradient structure insulators are lamination and centrifugation.
The lamination method, i.e. stacking materials with different dielectric constants to form an insulator component, for example, CN103247395A discloses a multilayer high gradient insulator for high voltage transmission and a preparation method thereof, wherein a thin conductive layer is embedded in an insulating material body to avoid charge accumulation and flashover discharge; CN105679473A discloses a method for manufacturing a dielectric function gradient insulator by lamination, which manufactures an insulator with gradient dielectric parameters by lamination.
A centrifugal method, in which a filler is distributed in a gradient manner along the centrifugal direction so as to regulate and control the dielectric constant distribution of the insulator, for example, CN105542399A discloses a manufacturing method of a dielectric function gradient insulator, which realizes the continuous gradient distribution of dielectric parameters in the insulator; CN111331767A discloses a method for manufacturing surface conduction nonlinear insulator by centrifugal technique, which realizes excellent interface stability. The limitation of the lamination method is that it is difficult to achieve continuous distribution of dielectric parameters, and interface bonding has defects; although the centrifugal method can realize the continuous distribution of node parameters, the method cannot realize quantitative control, has extremely complex process conditions and does not have large-scale production conditions. CN11136856 discloses a double-component mixed epoxy casting dielectric function gradient insulation manufacturing device and a method, and a double-component quantitative system is utilized to realize continuous and accurate dielectric parameter regulation.
However, all the preparation methods are directed to common post insulators, and no research report about gradient manufacturing of three post insulators applied in large scale in the field of GIL and GIS exists, on one hand, the three post insulators are more complex in structure and more difficult to realize gradient distribution compared with the common post insulators, and on the other hand, the three post insulators are larger in size, larger in defect generation probability and more accurate in process requirements.
Therefore, the technology for producing the defect-free three-post insulator with the gradient structure in a large scale is a key step for promoting the forward development of the ultrahigh voltage transmission equipment.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a device and a process for rotary pouring and forming of a three-post insulator with a non-hole gradient structure, aiming at the problem that the three-post insulator for ultrahigh voltage power transmission cannot realize the manufacture of the gradient structure.
The invention adopts the following technical scheme:
a gradient structure imperforate three-post insulator rotary pouring forming device comprises a bi-component quantitative feeding system, a plurality of self-heating molds, a central rotating shaft, a negative pressure system and a control system;
the bi-component quantitative feeding system is used for outputting an organic insulating material mixture with the filler concentration changing along with time to the self-heating mould to realize the radial gradient distribution of the dielectric constant along the three-post insulator; the double components are organic insulating material mixture and filler;
the self-heating mould can be tightly attached to the central rotating shaft under the matching of the sealing piece and is used for heating, curing and forming the organic insulating material mixture; the uniform and fast curing of the organic insulating material mixture is realized;
the negative pressure system is used for exhausting air in the cavity of the self-heating mould to form negative pressure; the self-heating mould is tightly adsorbed on the central rotating shaft through a negative pressure system, and meanwhile, bubbles generated in the pouring process of the organic insulating material mixture are avoided and the organic insulating material mixture is prevented from being developed into pores;
the control system is used for controlling the feeding of the bi-component quantitative feeding system, the negative pressure system to form negative pressure for the air exhaust of the self-heating mould and the rotation of the central rotating shaft.
Further, the self-heating mould comprises a forming cavity, a heating unit, a sealing cover and a rubber sealing ring;
the upper end part of the forming cavity is provided with the sealing cover; the lower end part of the forming cavity is an open part which can be tightly attached to the central rotating shaft, and the rubber sealing ring is used for sealing the joint of the forming cavity and the central rotating shaft;
the heating unit is a resistance wire and is arranged around the forming cavity.
Further, the two-component quantitative feeding system is provided with a pouring tube, and the pouring tube penetrates through the sealing cover to enter the forming cavity; the pouring tube can move up and down in the forming cavity, and a feed port of the pouring tube is always positioned above the liquid level of the organic insulating material mixture.
Furthermore, the central rotating shaft comprises a stainless steel shaft, a resistance wire heating layer and a rotating unit; the resistance wire heating layer is arranged inside the stainless steel shaft, and the rotating unit is used for driving the central rotating shaft to rotate.
Further, the connection part of the two-component quantitative feeding system and the self-heating mould, the connection part of the sealing cover of the self-heating mould and the forming cavity, and the connection part of the self-heating mould and the negative pressure system are sealed; the sealing treatment comprises the use of rubber rings, gaskets and turnbuckles.
The invention also provides a rotary pouring forming process of the non-porous three-post insulator with the gradient structure, and the process comprises the following steps:
s1, selecting the type of the filler, and respectively filling the filler and the organic insulating material mixture into 2 material cylinders of a two-component quantitative feeding system;
s2, setting a proportion change curve, a heating temperature and curing time of the filler;
s3, tightly buckling a plurality of self-heating molds on the central rotating shaft, and connecting the self-heating molds to a negative pressure system; starting a negative pressure system, and exhausting gas in the self-heating mould until the pressure in the self-heating mould is less than a set value;
s4, extending a pouring tube of the bi-component quantitative feeding system into a forming cavity of the self-heating mould, descending a discharge port to the bottom of the forming cavity, and starting the bi-component quantitative feeding system; the discharge port is synchronously lifted along with the rising of the casting liquid level, so that the liquid level at the top is ensured to be stable until the whole self-heating mold cavity is filled with the organic insulating material mixture; closing the bi-component quantitative feeding system and the negative pressure system, starting a heating unit of the self-heating mould and/or a resistance wire heating layer of the central rotating shaft, and heating and curing;
s5, after the solidification is finished, opening a sealing cover of the self-heating mould, and demoulding to obtain a single strut; rotating the central rotating shaft by 120 degrees, and pouring and curing the next strut; repeating S3 and S4 twice to complete the curing of 3 pillars.
Further, before step S3, the inside of the mold is wiped clean with IPA, and the epoxy resin mold release agent is uniformly applied or sprayed to the mold cavity with a dust-free cloth or a spray gun.
Further, in step S1, the organic insulating material mixture is epoxy resin.
Further, in step S1, the epoxy resin is bisphenol a type epoxy resin, and the filler is alumina particles or barium titanate particles.
Further, in step S2, the decreasing or increasing of the dielectric constant in the radial direction of the pillar is controlled by selecting the type of the filler and the proportional variation curve; controlling the variation amplitude of the dielectric constant in the radial direction of the support column by selecting the addition concentration of the filler; the heating temperature is set to be 120-150 ℃, and the curing time is kept for 10-12 hours.
Further, in step S4, the self-heating mold internal pressure is less than 0.01 Pa.
Further, in step S4, the number of the self-heating molds is 8 or more, and the self-heating molds are tightly fastened to the central shaft.
Further, the control system controls the feeding of the bi-component quantitative feeding system, the negative pressure system forms negative pressure for the air exhaust of the self-heating mould and the rotation of the central rotating shaft.
The invention has the beneficial effects that: according to the rotary pouring forming process of the gradient structure imperforate three-post insulator, through the rotary pouring design, the dielectric constant of the three-post insulator can be changed along the radial gradient of the post (increasing/decreasing/dispersing), the regulation and control capacity of the three-post insulator on an electric field can be freely set according to the use requirement, the control and shape control integrated manufacturing is realized, and the surface flashover is avoided; meanwhile, the manufacturing process provided by the invention can avoid the generation of pores caused by bubbles in the casting process, ensure the mechanical performance of the three-post insulator, can realize batch casting and realize large-scale benefits.
Drawings
Fig. 1 is a schematic structural diagram of a gradient-structure imperforate three-post insulator rotational casting forming device according to an embodiment of the present invention.
FIG. 2 is a schematic view of a single insulator after casting and demolding; (a) when the casting is started, (b) before the casting is finished, and (c) after the demoulding.
Fig. 3 is a schematic view of the assembled three-post insulator with no hole in the gradient structure.
FIG. 4 is a schematic view showing the cooperation of a plurality of self-heating molds and a central rotating shaft in the embodiment.
Wherein: 1-two-component dosing system; 11-a material cylinder; 12-a pouring tube; 2-self-heating the mould; 21-rubber gasket; 22-pressure gauge; 23-a pouring switch; 24-rubber seal ring; 3-central rotating shaft.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects.
As shown in fig. 1, a gradient structure imperforate three-post insulator rotary casting forming device in an embodiment of the present invention includes a bi-component quantitative feeding system 1, a plurality of self-heating molds 2, a central rotating shaft 3, a negative pressure system and a control system; the bi-component quantitative feeding system 1 is used for outputting an epoxy resin mixture with the filler concentration changing along with time to the self-heating mould 2 to realize the radial gradient distribution of the dielectric constant along the three-post insulator; the double components are epoxy resin and filler; the self-heating mould 2 can be tightly attached to the central rotating shaft 3 and is used for heating, curing and forming an epoxy resin mixture (other organic insulating materials can be selected, such as plastic resin composite materials and the like); the negative pressure system is used for exhausting air in the cavity of the self-heating mould 2 to form negative pressure; the control system is used for controlling the feeding of the bi-component quantitative feeding system 1, the negative pressure system to form negative pressure for the air exhaust of the self-heating mould 2 and the rotation of the central rotating shaft 3.
Preferably, more than eight self-heating molds 2 can be simultaneously adsorbed on the central rotating shaft 3, so that the batch manufacturing of the gradient structure nonporous three-post insulator is completed.
As a preferred embodiment, the self-heating mold 2 includes a heating unit, a forming chamber, and a sealing cover. The self-heating mould 2 can be heated by adopting a resistance wire; the lower end of the self-heating mould 2 is an open part, the edge of the open part is tangent to the central rotating shaft 3, and the edge of the open part can be tightly attached to the central rotating shaft 3 under the matching of a sealing piece. Before casting, a release agent is coated on the inner wall of the mold 2; the negative pressure system pumps the interior of the self-heating mould into a negative pressure state through the air outlet hole, so that the self-heating mould 2 is tightly adsorbed on the central rotating shaft 3. During casting, the two-component dosing system 1 fills the epoxy mixture in the molding cavity through the casting tube 25. After the pouring is finished, the heating unit is started, and the epoxy resin mixture is cured and formed. When the sealing cover is closed, the self-heating mould 2 keeps a negative pressure state to finish pouring; when the sealing cover is unloaded, the self-heating mold 2 is peeled off from the cured object through a demolding device.
As another preferred embodiment, the central rotating shaft 3 comprises a stainless steel shaft, a resistance wire heating layer, and a rotating unit. During pouring, the self-heating mold 2 is adsorbed on the central rotating shaft 3, and the resistance wire heating layer is matched with the self-heating mold 2 to jointly control the curing temperature. After the single support is solidified, the rotating unit drives the central line rotating shaft 3 to rotate 120 degrees, and then the next support is poured and solidified. And (3) completing the pouring process of the three-pillar structure through two 120-degree rotations.
Preferably, the two-component quantitative feeding system 1 can quantitatively output an epoxy resin mixture with the concentration of the filler changing along with time, wherein the filler refers to materials with different dielectric constants such as aluminum oxide particles and barium titanate particles, and the epoxy resin refers to bisphenol A type epoxy resin; the discharge speed and the mixing proportion of the bi-component feeding system 1 can be freely adjusted according to requirements.
Preferably, the connection part of the sealing cover and the forming cavity of the self-heating mold 2, the connection part of the self-heating mold 2 and the two-component feeding system 1, the connection part of the self-heating mold 2 and the negative pressure system, and the connection part of the forming cavity of the self-heating mold 2 and the central rotating shaft 3 are sealed, and the connection parts can specifically comprise a rubber sealing ring 24, a rubber gasket 21, a gasket, a turnbuckle and the like.
Preferably, in order to ensure that the self-heating mold 2 is tightly adsorbed on the central rotating shaft 3, the edge curve of the lower end of the self-heating mold 2 is strictly tangent to the central rotating shaft 3.
Preferably, in order to avoid the generation of bubbles, the negative pressure system controls the pressure in the cavity of the mold 2 to be lower than 0.01Pa in a full-program mode, and the pressure gauge 22 is used for monitoring the air pressure.
Preferably, in order to ensure the epoxy resin mixture is completely cured, the temperature of the self-heating mold 2 and the central rotating shaft 3 is kept at 120-150 ℃, and the curing time is kept for 10-12 hours.
Preferably, the decrease or increase of the dielectric constant in the radial direction of the pillar is realized by selecting the fillers with different dielectric constants; the amplitude of the change of the dielectric constant of the support column is controlled by selecting different adding concentrations of the filler.
Preferably, the proper special release agent for epoxy resin is selected to ensure smooth release of the parts.
Particularly, under the vacuum (negative pressure) state, the slurry is slowly injected into the forming cavity under the action of the negative pressure, the feeding port always keeps a certain distance of the liquid level and rises along with the rise of the liquid level, so that the impact disturbance is prevented, and the stability of the liquid level is ensured.
The embodiment of the invention provides a rotary pouring forming process of a gradient structure imperforate three-post insulator, which comprises the following steps:
s1, selecting the type of the filler, and respectively filling the filler and the epoxy resin into 2 material cylinders 11 of a two-component quantitative feeding system;
s2, setting a proportion change curve of the filler, a heating temperature of 150 ℃ and a curing time of 10 hours;
s3, tightly buckling a plurality of self-heating molds 2 on the central rotating shaft 3, and connecting the self-heating molds to a negative pressure system; starting a negative pressure system, and exhausting gas in the self-heating mould 2 until the pressure in the self-heating mould 2 is less than 0.01 Pa;
s4, extending the pouring 12 of the quantitative dual-component feeding system 1 into a forming cavity of the self-heating mold 2, descending a discharge port to the bottom of the forming cavity, and starting the quantitative dual-component feeding system 1; the discharge port is synchronously lifted along with the rising of the casting liquid level, so that the liquid level at the top is ensured to be stable until the epoxy resin mixture is filled in the whole cavity of the self-heating mould 2; the bi-component quantitative feeding system 1 and the negative pressure system are closed, and a heating unit of the self-heating mould 2 and/or a resistance wire heating layer of the central rotating shaft 3 are/is started for heating and curing;
s5, after the solidification is finished, opening a sealing cover of the self-heating mould 2, and demoulding to obtain a single strut; rotating the central rotating shaft by 120 degrees, and pouring and curing the next strut; repeating S3 and S4 twice to complete the curing of 3 pillars.
Preferably, before step S3, the inside of the mold 2 is wiped clean with IPA, and the epoxy resin release agent is uniformly applied or sprayed to the cavity of the mold 2 with a dust-free cloth or a spray gun.
Example 1
The control system sets the heating temperature to be 150 ℃ and the curing time to be 10 h.
The two-component dosing system 1 is charged with resin and filler. Bisphenol a epoxy resin E44 (dielectric constant ∈ 4) was selected as the resin, alumina particles (dielectric constant ∈ 9) were selected as the filler, and the filler output concentration was set to decrease with time.
The inner walls of 8 self-heating molds 2 were wiped clean with IPA and then coated with a layer of EP-51808 epoxy release agent.
And buckling 8 self-heating molds 2 on the central rotating shaft 3, starting a negative pressure system, and exhausting air in the molds 2 until the air pressure representation number is less than 0.01 Pa.
The discharge gate is lowered to the lowest position and the two-component dosing system 1 and heating unit are started until the epoxy resin mixture fills the entire mould 2 and the feed is stopped.
And curing for 10 hours, taking down the mold 2 by using demolding equipment, and finishing the casting and curing of the single support. And rotating the central rotating shaft 3 by 120 degrees through a control system, and repeating the pouring and curing steps to finish the other two struts.
The three-post insulator with the dielectric constant decreasing from the center of the circle along the radial direction is obtained, and the variation trend of the dielectric constant is stable.
Example 2
The two-component dosing system 1 is charged with resin and filler. Bisphenol a epoxy resin E44 (dielectric constant ∈ 4) was selected as the resin, barium titanate particles (dielectric constant ∈ 1400) were selected as the filler, and the filler output concentration was set to increase with time.
After the inner walls of 8 self-heating molds 2 were wiped clean with IPA, a layer of Yangtze PVA epoxy release agent was sprayed on the inner walls with a spray gun, and the air pressure of the spray gun was set to 100 Psi.
And buckling 8 self-heating molds 2 on the central rotating shaft, starting a negative pressure system, and discharging air in the self-heating molds until the air pressure representation number is less than 0.01 Pa.
The discharge gate is lowered to the lowest position and the two-component dosing system 1 and heating unit are started until the epoxy resin mixture fills the entire mould 2 and the feed is stopped.
And curing for 10 hours, taking down the self-heating mould 2 by using demoulding equipment, and finishing the casting and curing of the single strut. And rotating the central rotating shaft by 120 degrees through a control system, and repeating the pouring and curing steps to finish the other two struts.
The three-post insulator with the dielectric constant gradually increased along the radial direction from the center of the circle is obtained, and the variation trend of the dielectric constant is severe.
The invention utilizes the bi-component quantitative feeding system 1 to fill epoxy resin mixtures with different filler concentrations into the mould 2, and utilizes the rotation of the central rotating shaft 3 to realize the rotary casting of the three-support structure, thereby obtaining the insulator with the dielectric constant value distributed along the radial gradient of the three supports, actively regulating and controlling the electric field, and avoiding the accidents of flashover frequency and electric field breakdown.
It should be noted that the epoxy resin used in the above embodiments is not exclusive and may be replaced by other organic insulating materials.
While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.
Claims (8)
1. A gradient structure aporate three-post insulator rotary casting forming process is characterized in that a gradient structure aporate three-post insulator rotary casting forming device is utilized;
the device comprises a bi-component quantitative feeding system, a plurality of self-heating molds, a central rotating shaft, a negative pressure system and a control system;
the bi-component quantitative feeding system is used for outputting an organic insulating material mixture with the filler concentration changing along with time to the self-heating mould to realize the radial gradient distribution of the dielectric constant along the three-post insulator; the double components are organic insulating materials and fillers;
the bottom contour edge of the self-heating mould can be tightly attached to the central rotating shaft and is used for heating, curing and forming the organic insulating material mixture; the self-heating mould comprises a forming cavity, a heating unit, a sealing cover and a rubber sealing ring; the upper end part of the forming cavity is provided with the sealing cover; the lower end part of the forming cavity is an open part which can be tightly attached to the central rotating shaft, and the rubber sealing ring is used for sealing the joint of the forming cavity and the central rotating shaft; the heating units are resistance wires and are arranged around the forming cavity;
the negative pressure system is used for exhausting air in the cavity of the self-heating mould to form negative pressure;
the control system is used for controlling the feeding of the bi-component quantitative feeding system, the negative pressure system forms negative pressure for the air exhaust of the self-heating mould and the rotation of the central rotating shaft;
the process comprises the following steps:
s1, selecting the type of the filler, and respectively filling the filler and the organic insulating material mixture into 2 material cylinders of a two-component quantitative feeding system;
s2, setting a proportion change curve, a heating temperature and curing time of the filler;
s3, tightly buckling a plurality of self-heating molds on the central rotating shaft, and connecting the self-heating molds to a negative pressure system; starting a negative pressure system, and exhausting gas in the self-heating mould until the pressure in the self-heating mould is less than a set value;
s4, extending a pouring tube of the bi-component quantitative feeding system into a forming cavity of the self-heating mould, descending a discharge port to the bottom of the forming cavity, and starting the bi-component quantitative feeding system; the discharge port is synchronously lifted along with the rising of the casting liquid level, so that the liquid level at the top is ensured to be stable until the whole self-heating mold cavity is filled with the organic insulating material mixture; closing the bi-component quantitative feeding system and the negative pressure system, starting a heating unit of the self-heating mould and/or a resistance wire heating layer of the central rotating shaft, and heating and curing;
s5, after the solidification is finished, opening a sealing cover of the self-heating mould, and demoulding to obtain a single strut; rotating the central rotating shaft by 120 degrees, and pouring and curing the next strut; repeating S3 and S4 twice to complete the curing of 3 pillars.
2. The process of claim 1, wherein in step S1, the mixture of organic insulating materials is bisphenol a epoxy resin, and the filler is alumina particles or barium titanate particles.
3. The gradient structure imperforate three-post insulator rotation casting forming process of claim 1, wherein in step S2, the decrease or increase of the dielectric constant in the radial direction of the post is controlled by selecting the type of the filler and the proportional variation curve; controlling the variation amplitude of the dielectric constant in the radial direction of the support column by selecting the addition concentration of the filler; the heating temperature is set to be 120-150 ℃, and the curing time is kept for 10-12 hours; in step S3, the pressure in the self-heating mold is less than 0.01 Pa.
4. The process of claim 1, wherein in step S3, the number of self-heating molds is 8 or more, and the self-heating molds are tightly fastened to the central shaft.
5. The gradient structure imperforate three-post insulator rotary casting forming process of claim 1, wherein a control system controls the feeding of the bi-component quantitative feeding system, the negative pressure of the negative pressure system to the self-heating mold and the rotation of the central rotating shaft.
6. The gradient structure imperforate three-post insulator rotation casting molding process of claim 1, wherein the two-component quantitative supply system is provided with a casting tube which passes through the sealing cover into the inside of the molding cavity; the pouring tube can move up and down in the forming cavity, and a feed port of the pouring tube is always positioned above the liquid level of the organic insulating material mixture.
7. The gradient structure imperforate three-post insulator rotation casting forming process of claim 1, wherein the central rotating shaft comprises a stainless steel shaft, a resistance wire heating layer and a rotating unit; the resistance wire heating layer is arranged inside the stainless steel shaft, and the rotating unit is used for driving the central rotating shaft to rotate.
8. The gradient structure imperforate three-post insulator rotation casting molding process of claim 1, wherein the connection part of the two-component quantitative feeding system and the self-heating mold, the connection part of the sealing cover and the molding cavity of the self-heating mold, and the connection part of the self-heating mold and the negative pressure system are all sealed; the sealing treatment comprises the use of rubber rings, gaskets and turnbuckles.
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| CN102886851A (en) * | 2012-09-19 | 2013-01-23 | 中国西电电气股份有限公司 | Casting die for three-post insulator |
| CN107160626A (en) * | 2017-07-18 | 2017-09-15 | 东莞汇美模具制造股份有限公司 | A kind of three color injection mold structures |
| CN111136856A (en) * | 2019-12-30 | 2020-05-12 | 西安交通大学 | Double-component mixed epoxy casting dielectric function gradient insulation manufacturing device and method |
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| CN1063838A (en) * | 1991-01-29 | 1992-08-26 | 张基 | Production process and equipment for large-sized special-shaped hollow plastic product |
| JPH07124965A (en) * | 1993-11-02 | 1995-05-16 | Toyo Tire & Rubber Co Ltd | Production equipment and manufacture of synthetic resin foam-molded body |
| CN102886851A (en) * | 2012-09-19 | 2013-01-23 | 中国西电电气股份有限公司 | Casting die for three-post insulator |
| CN107160626A (en) * | 2017-07-18 | 2017-09-15 | 东莞汇美模具制造股份有限公司 | A kind of three color injection mold structures |
| CN111136856A (en) * | 2019-12-30 | 2020-05-12 | 西安交通大学 | Double-component mixed epoxy casting dielectric function gradient insulation manufacturing device and method |
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