23 results about "Resin casting" patented technology

The invention relates to a novel transition tank for pouring low-viscosity epoxy resin, and belongs to the technical field of production and processing of insulating parts, the novel transition tank comprises a support and a tank body mounted on the support, the tank body is a transparent tank, an injection port is formed in the middle of the top end of the tank body, and a vacuumizing pipe is further arranged at the top of the tank body; a heater, a degassing barrel, degassing rings and a degassing umbrella are respectively arranged in the tank body, the heater is arranged in the middle of the degassing barrel, and a plurality of degassing rings are arranged in the degassing barrel. The tank body is made of organic glass or high borosilicate glass, the U-shaped heating pipe is arranged in the middle of the degassing barrel, and heat is diffused from inside to outside. The heat conductivity coefficient of the tank body made of organic glass or high borosilicate glass is 50 times lower than that of the tank body made of a metal shell in the prior art, the heat preservation effect is greatly improved, and the heat efficiency is improved.

The present application relates to the field of foundry, especially to a kind of organic resin foundry waste sand recycling equipment, including mounting frame, cylinder, limiting frame and drive unit etc.;Mounting frame is connected with drive unit. Drive unit is connected with cylinder. Drive unit is connected with limiting frame, and drive unit is used to drive cylinder to lift and rotate, and also used to drive limiting frame to move. Cylinder is installed with annular knife. Mounting frame is fixedly connected with sieve plate. Sieve plate is fixedly connected with fixing ring for positioning sand box. Mounting frame is fixedly connected with collecting hopper, and collecting hopper is located below sieve plate. Cylinder is connected with cleaning unit for cleaning casting wheel. The equipment breaks waste sand by rotating and applying downward pressure, makes it loose and falls down, after waste sand passes through sieve plate, it falls into lower collecting container through collecting hopper, at the same time, when brush plate one contacts with the upper surface of casting wheel, it can brush the upper surface and the upper surface of rib to clean and remove attached waste sand.

The invention provides a cleaning method for an epoxy resin pouring mold, and belongs to the technical field of high polymer material processing.The cleaning method for the epoxy resin pouring mold comprises the following steps that a mold with epoxy resin residues is placed in a closed freezing cabin; a liquid nitrogen refrigerating system is started; starting a medium injection system, and performing multi-angle injection on the mold cavity by using the pre-cooled non-metal medium; in the spraying process, the local temperature gradient is monitored in real time through a micro thermocouple array pre-buried in the mold body, and liquid nitrogen spraying in the corresponding area is reduced or suspended; after spraying is finished, the mold sinks to enter a warm area in the cabin, the surface temperature of stripped chippings is increased to be higher than the glass-transition temperature Tg of the chippings to be softened and lose viscosity, and then the chippings rise to a cold area again; the stripped chippings and the medium mixture are separated through a three-stage online classifier at the cabin bottom; the problems that in the cleaning process of the epoxy resin pouring mold, the mold precision is damaged, the cleaning efficiency and reliability are insufficient, the operation cost is high, and the environmental protection property is poor can be solved.

The invention discloses equipment for preparing an epoxy impregnated paper sample, the equipment comprises a mold, an epoxy resin casting material and a vacuum oven, the mold comprises two groups of symmetrically arranged mold main bodies, and the two groups of mold main bodies are fixed by fasteners; pouring cavities are formed in the opposite sides of the mold main bodies, tightened crepe paper is clamped between the two mold main bodies, two sample electrodes are symmetrically arranged in the two pouring cavities, and pouring intervals are formed between the opposite ends of the two sample electrodes and the crepe paper; the epoxy resin pouring material is vacuumized in the vacuum oven and then poured into the pouring cavity; and the mold poured with the epoxy resin pouring material is vacuumized in a vacuum oven. By utilizing the equipment disclosed by the invention, the stretching state of the crepe paper can be effectively controlled, the introduction of bubbles is reduced, a test sample with equivalent insulation characteristics with an actual epoxy impregnated paper sleeve is prepared, and a technical support is provided for accurately evaluating the related performance of an epoxy impregnated paper insulating material.

The utility model discloses a cable joint of a water immersion prevention low-voltage cabinet, which relates to the technical field of low-voltage cabinets and comprises a first resin casting sleeve which is formed on a shell of the water immersion prevention low-voltage cabinet in a casting manner, a wiring busbar is embedded in the first resin casting sleeve, and two ends of the wiring busbar protrude out of the first resin casting sleeve; the wiring terminal is provided with a busbar connecting end and a cable connecting end, the busbar connecting end is fixedly connected with one end of the wiring busbar, and the cable connecting end is fixedly connected with a cable outside the cabinet; and the second resin casting sleeve and the first resin casting sleeve are connected into a whole, and the second resin casting sleeve wraps one end, connected with the wiring terminal, of the wiring busbar, the wiring terminal and part of the cable outside the cabinet. According to the utility model, the waterproof connection of the cable outside the cabinet can be realized without plugging a waterproof connector, and the connection cost of the cable outside the cabinet can be reduced.

The application discloses a method for preparing an epoxy resin casting body by using a roll pressing-laminating method, utilizes a double roll mill to dynamically adjust the opening temperature, roll speed and interval of the double roll, and presses the epoxy resin blank with a single layer thickness; the single layer epoxy resin is laminated and pre-compacted by using a handheld roller; the laminated epoxy resin is placed on a hot press to perform a multi-stage hot pressing procedure of low-temperature medium-pressure, temperature rising and pressure releasing and high-temperature high-pressure; the compacted epoxy resin sheet is scribed to the target casting body shape, and is placed in a casting body mold after being cut; the program curing in the oven is performed; and the sample is obtained after being polished after demolding. The three-stage degassing is performed by roll pressing-laminating-pre-compacting-hot pressing, the bubble residue is reduced from the source, the apparent defects are few, and the dispersion coefficient of the mechanical test of the casting body is greatly reduced.

The application discloses a rock-like test piece with pre-embedded seepage channels and / or water gushing cavities and a preparation method thereof, and aims to solve the technical problem that the existing simulation test piece cannot truly simulate and clearly and visually observe the influence of water seepage in seepage channels and / or water gushing in water-rich cavities on surrounding rock and lining structure inside rock mass. The application uses high brittleness and transparency resin casting to simulate engineering rock mass, and embeds a tunnel and a model with pre-embedded seepage channels and water gushing cavities in the engineering rock mass based on an engineering site. The obtained rock-like test piece has the characteristics of transparency, easy observation, realization of various working condition combinations, high brittleness of rock, etc., can clearly observe the evolution law of seepage and water gushing under the action of load, and can be used for the research on the seepage mechanism of original seepage channels and the water gushing mechanism of water-rich cavities.

The utility model relates to a short-time gel thermosetting resin casting device which comprises a reaction kettle, a control valve, a telescopic flow guide pipe and a casting mechanism, a servo motor is arranged in the center of the top of the reaction kettle, a reaction pot is arranged in the reaction kettle, and a cavity between the inner wall of the reaction kettle and the reaction pot is a reaction furnace; a feeding hole is formed in the left side of the top center of the reaction kettle. The device is reasonable in structural arrangement and convenient to use, needed resin is prepared through the reaction kettle, the resin flows to the casting mechanism through the control valve and the telescopic flow guide pipe, then the resin flows to the mold at a constant speed through the speed control valve, stable casting is achieved, and the problems that an existing device cannot control the temperature and gelation of the resin in the process from preparation to casting, and the production cost is low are solved. Pollution is eliminated from the source, the heat and humidity resistance of the product is remarkably improved, and meanwhile the technical problems of operation risks, poor process repeatability, large product performance fluctuation and the like existing in traditional manual casting are solved.

The invention belongs to the technical field of high polymer materials, and relates to a flame-retardant epoxy resin casting material and a preparation method thereof. The invention provides a preparation method of a flame-retardant epoxy resin casting material, which comprises the following steps: dissolving dimethyl polysiloxane in a lipophilic solvent, then dropwise adding onto aluminum oxide powder while stirring, and heating in a nitrogen atmosphere to obtain PDMS (Polydimethylsiloxane) modified aluminum oxide; mixing epoxy resin and silica powder in vacuum to obtain a resin mixture; mixing silane coupling agent modified DOPO, the PDMS modified aluminum oxide and an anhydride curing agent in vacuum to prepare a curing agent mixture; and performing vacuum mixing on the resin mixture and the curing agent mixture to obtain the castable. The PDMS modified aluminum oxide and the silane coupling agent modified DOPO are adopted, so that the electrical performance and the mechanical performance of the flame-retardant epoxy resin casting material are synergistically improved.

The utility model relates to the technical field of bus ducts, in particular to a totally-enclosed resin pouring waterproof bus duct, which comprises a bottom plate, an outer frame, a connecting port and a fixing frame, the upper surface of the bottom plate is fixedly connected with the outer frame, the connecting port is fixedly connected inside the outer frame, the outer surface of the outer frame is fixedly connected with the fixing frame, and the fixing frame is fixedly connected with the connecting port. A waterproof assembly is arranged on the surface of the fixing frame, a mounting assembly is fixedly connected to the upper surface of the waterproof assembly and comprises a damping expansion piece located on the upper surface of the waterproof assembly, and a mounting plate is fixedly connected to the upper end of the damping expansion piece. According to the utility model, through the arrangement of the waterproof assembly, the rotating disc is rotated, the one-way screw rod rotates along with the rotating disc during use, the protection frame is further driven to slide along the sliding strip, the connection port can be completely covered, and through the cooperation of the one-way screw rod and the protection frame, moisture is effectively prevented from invading into the bus duct from the external environment; and the risk of short circuit fault caused by water inflow is greatly reduced.

This invention provides a large-diameter steel wire rope joint. During installation, the large-diameter steel wire rope to be connected is first placed between two conical bodies for initial fixation. Then, using a specialized installation tool, the assembled connector is slowly pushed axially along the conical sleeve within the connector. As the connector is pushed deeper, the conical surface between the sleeve and the conical body generates gradually increasing radial compressive force. Through the anti-slip structure, reliable engagement between the conical body and the inner wall of the sleeve is ensured. Simultaneously, the claws inside the conical body tightly adhere to and engage with the surface of the steel wire rope under radial pressure, locking the axial movement of the steel wire rope. Once the connector is pushed to the designed depth and the connector is inserted into the slot, the joint is installed in place with the steel wire rope. At this point, the entire joint and the steel wire rope form a strong and reliable connection. Subsequently, alloy casting or resin casting is performed to further enhance the bonding strength and achieve a tighter bond.

This invention relates to the field of electrical equipment insulation casting technology, specifically to a step-by-step epoxy resin casting process and mold. The process includes the following steps: Step S1: preparing epoxy resin mixture; Step S2: loading the transformer coil into the mold; Step S3: preheating the mold to a set temperature and maintaining a constant temperature, then removing it from the mold and cooling it; Step S4: placing the mold in a casting tank and drawing a vacuum; Step S5: pouring the epoxy resin mixture into the mold until the liquid level just covers the observation window scale line, then stopping the pouring; Step S6: filling the casting tank with insulating gas to maintain a low vacuum; Step S7: secondary pouring; Step S8: controlling the mold temperature to allow the epoxy resin mixture to gel and solidify; Step S9: demolding for post-curing. This invention, by performing secondary pouring and controlling the pouring parameters during the casting process, maintains stable core performance and, simultaneously, gels and solidifies in an insulating gas environment, improves the insulation performance and structural integrity of the epoxy resin casting.

The invention relates to the field of high-performance epoxy resin composite materials, and particularly discloses a water removal foam inhibitor of epoxy resin for zero-bubble pouring and a preparation method of the water removal foam inhibitor. According to the foam inhibitor, a'core-shell-bridge 'multilevel structure is innovatively constructed: lithium hydroxide loaded titanium-silicon modified nano silicon dioxide is used as a water removal core, phosphorus-fluorine modified nano calcium carbonate is coated as a solid gas shell, and an epoxy / amino silane compound system is used as a molecular bridge to connect a resin matrix. The foam inhibitor is prepared by a multi-step chemical modification, in-situ polymerization and dispersion process, can eliminate moisture and CO2 from the source, realizes zero bubble of a casting body, synchronously improves the mechanical strength, hydrophobicity and flame retardance of the casting body, and is suitable for high-end coatings and casting materials with extremely high reliability requirements.

This invention provides a single-cavity explosion-proof electromagnetic relay, comprising a base plate, a coil support on one side of the base plate, a coil mounted in the coil support, an adsorption plate above the coil support for contacting normally open or normally closed contacts, normally open, normally closed, and other contacts integrated into the base plate, a contact heat-conducting plate embedded within the base plate for contacting the normally open or normally closed contacts, and the upper and lower ends of the coil respectively contacting the coil heat-conducting plate; an inner sleeve connected to the base plate is provided outside the coil support, an outer sleeve is provided outside the inner sleeve, and a support grid is provided inside the outer sleeve, forming a gap between the inner sleeve and the outer sleeve for resin casting; heat dissipation fins are bolted to the outside of the movable cover. This invention maintains excellent explosion-proof performance while ensuring heat dissipation performance, achieving a balance between the two and meeting the requirements for use in a single explosion-proof cavity.

The invention relates to a method for manufacturing a dial comprising the following steps: forming a first part of the dial from a first resin filled with reflective particles, the first part forming a bed; casting at least one second resin into the bed to form the second part of the dial and obtain a dial; thoroughly or selectively polishing the dial to locally reveal the first resin comprising the reflective particles.

This utility model discloses an epoxy resin casting type instrument transformer injection connection sealing device, belonging to the field of instrument transformer molding technology. It includes a transition pipe with a polypropylene connector installed at its upper end. A sealing ring is fitted onto the polypropylene connector. The lower end of the transition pipe has anti-detachment teeth. An annular material groove is fitted onto the upper half of the transition pipe, and a guide pipe is provided on the annular material groove. A hydraulic cylinder fixes the polypropylene connector to the mold inlet. The polypropylene connector and the sealing ring provide a double seal at the interface, ensuring that the epoxy resin will not leak at the connection point under pressure injection. When the transition pipe and polypropylene connector are separated, under pressure, the epoxy resin mixture flows into the annular material groove and then into a collection bucket for unified treatment via the guide pipe on the annular material groove. This solves the problem of repeated disassembly and reassembly of the injection port, improves work efficiency, and keeps the work site clean and tidy.

Resin casting mold (500; 600) for foaming a heat-insulating resin component (40, 41, 42, 43, 44; 410, 411, 412; 420, 421, 422, 423; 430, 431, 432, 433; 440, 441, 442), the resin casting mold (500; 600) comprising: a lower form (510; 610) with a recess (512; 612) and a first outer edge (511; 611) as the outer edge of the recess (512; 612); an upper form (520; 620) with a protrusion (522; 622) that fits into the recess (512; 612), and a second outer edge (521; 621) as outer edge of the projection (522; 622); wherein the first outer edge (511; 611) is in contact with the second outer edge (521; 621) and the projection (522; 622) is received into the recess (512; 612) when the lower form (510; 610) is closed with the upper form (520; 620) to form a cavity (501; 601), wherein several recessed surfaces (513, 523; 613, 623) acting as vents (502; 602) are at least in the first outer edge (511;611) are formed, wherein the vents (502; 602) connect the uppermost section of the cavity (501; 601) and the exterior of the resin mold (500; 600), and wherein a width of the recessed surfaces (513, 523; 613, 623) is greater than a distance between the recessed surfaces (513, 523; 613, 623).;

The invention provides an epoxy resin insulation surface silicone rubber high-density adhesion device and process, and the process comprises the steps: fixing a pretreated epoxy resin casting body on a workpiece fixing mechanism, placing unvulcanized silicone rubber on a silicone rubber material bearing device, and then sealing a vacuum pressure container; the vacuum system is started to vacuumize the vacuum pressure container to a high vacuum degree, the heating system is started to raise the temperature to a first preset temperature, and then heat preservation is carried out; filling inert gas through the pressurizing system to establish a first preset positive pressure, so that the silicon rubber infiltrates the surface of the epoxy resin casting body, and then maintaining the pressure; raising the temperature to a vulcanization temperature under positive pressure, carrying out constant-temperature vulcanization, and then carrying out pressure maintaining, cooling and pressure relief; and opening the vacuum pressure container to take out the epoxy resin casting body to form silicone rubber attached to the surface of the epoxy resin casting body.

The invention discloses a method for preparing an epoxy resin casting body by using a rolling-laminating method, which comprises the following steps of: dynamically adjusting the open milling temperature, the roller speed and the distance of double rollers by using a double-roller open mill, and pressing an epoxy resin blank with a single-layer thickness; laminating a single layer of epoxy resin, and pre-compacting by using a handheld roller; placing the laminated epoxy resin on a hot press, and carrying out multi-stage hot pressing procedures of low temperature, medium pressure, temperature rise, pressure relief and high temperature and high pressure; scribing the compacted epoxy resin sheet to a target pouring body shape, cutting, and placing in a pouring body mold; performing stroke curing in a drying oven; and demolding and polishing to obtain a sample. Three-stage degassing is carried out through rolling, lamination pre-compaction and hot-pressing compaction, bubble residues are reduced from the source, apparent defects are few, and the dispersion coefficient of a mechanical test of the casting body is greatly reduced.

The invention relates to the technical field of current transformers, in particular to a gas insulated switchgear current transformer with an external temperature monitoring function. Comprising an annular iron core, a secondary winding, a shell, a digital temperature sensor, a high-temperature-resistant wire and a transformer body formed by pouring epoxy resin on a three-core aviation plug base, and an external temperature monitoring module connected with the transformer body through a three-core aviation plug. The digital temperature sensor is installed at a key heating point in the mutual inductor in an embedded mode, the high-temperature-resistant wire is of a twisted-pair shielding structure, and the external temperature monitoring module has the fault diagnosis and data communication capacity. According to the invention, real-time accurate monitoring and intelligent early warning of the internal temperature of the current transformer are realized, the air tightness of the gas-insulated switchgear is not damaged, the installation and maintenance are simple and convenient, the device can be linked with an intelligent power distribution system, the operation safety, reliability and intelligent level of equipment are significantly improved, and the device is suitable for various scenes such as middle and high voltage power distribution networks.