1088 results about "Porcelain insulator" patented technology

The invention discloses a method for denoising acoustic testing data of porcelain insulator vibration based on wavelet decomposition threshold denoising. The method comprises the following steps: using a vibration acoustic method to detect a porcelain insulator to acquire a porcelain insulator vibration response signal containing noise; selecting a suitable wavelet basis function for the porcelain insulator vibration response signal containing noise and then carrying out multi-resolution wavelet decomposition, and transforming the vibration response from a time domain to a wavelet domain; rationally selecting a threshold function and a threshold, and machining a wavelet coefficient corresponding to the noise according to the threshold function; carrying out wavelet reconstruction, transforming the vibration response after denoising treatment to the time domain from the wavelet domain; storing the de-noised vibration response and sorting an acoustic testing result of the porcelain insulator vibration. According to the method, the noise in the acoustic testing data of the porcelain insulator vibration can be effectively filtered, so that sorting accuracy is improved.

The present invention discloses a spinning electricity replacing method and a double yoke-plate device of high-tension transmission line strain insulator. A wing-shaped card and an insulation drawplate and other special tools on the end are used to firstly loose the stain insulator; a pulley block and a lead screw on the sides of a cross arm and a lead wire are used to complete break away the twoends of the strain insulator; finally the pulley block arranged on a ground bracket is used to rotate a porcelain insulator from a horizontal state to a vertical state, thus changing the complicated operation to the simple operation, greatly shortening the equipotential operation time and ensuring the safe operation of the line. The double yoke-plate device of high-tension transmission line strain insulator includes two wing-shaped cards and two lead screws as well as two insulation drawplates; one end of the two insulation drawplates is respectively connected with the two wings of the two wings of the wing-shaped card and the other end is respectively connected with the lead screw; the other end of the two lead screws is respectively connected with the two wings of the other wing-shaped card. The present invention has the advantages of simple structure, easy operation and low cost.

The invention relates to a porcelain insulator insulation state evaluation method based on solar-blind ultraviolet imaging image features. The porcelain insulator insulation state evaluation method comprises the steps of: acquiring a facula area sequence through calculating facula areas of continuous image frames in an UV video; extracting three quantization parameters including a facula area average value, a facula area mean square error and a large facula area frequentness of the facula area sequence by adopting an statistical analysis method; acquiring cluster centers in four insulating states such as good, poor, bad and very bad by adopting a fuzzy clustering algorithm; and then partitioning the insulation state of an insulator to be distinguished based on a minimum-distance criterion. According to the porcelain insulator insulation state evaluation method, the three feature parameters of the facula area sequence are regarded as feature quantities, the cluster centers in four insulating states can be obtained by adopting the FCM algorithm, the insulation state of an unknown sample is judged according to the Euclidean distance from the unknown sample to each cluster center, the quantization problem of ultraviolet imaging detection results is effectively solved, and a reliable basis can be provided for the maintenance or replacement of polluted insulators.

The invention discloses an elliptical porcelain insulator shape processing device and a processing method thereof. The elliptical porcelain insulator shape processing device comprises a rotation mechanism and a porcelain insulator shape processing mechanism; the porcelain insulator shape processing mechanism comprises a rack, a positioning plate arranged on the rack, a lifting device capable of moving upwards and downwards along the rack and an expansion device capable of moving back and forth horizontally along the lifting device; a fettling knife is arranged on one end of the expansion device; the expansion device is also provided with a positioning rod which cooperates with the positioning plate; the expansion device can drive the fettling knife and the positioning rod to move back and forth horizontally; the lifting device and the expansion device control the positioning rod on the expansion device to cooperate with the positioning plate, so that the fettling knife on the end of the expansion device processes the shape of the insulator earthen brick along the positioning plate. The elliptical porcelain insulator shape processing device reduces production difficulty of the elliptical porcelain insulator, and increases product percent of pass.

The invention discloses a method for preparing a porcelain insulator surface super-hydrophobic coating, which takes ethyl orthosilicate as a presoma and absolute ethyl alcohol as flux, and comprises the following steps: preparing silicon dioxide sol through alkaline catalysis, and adding a silane coupling agent to perform the modification treatment; after the porcelain insulator surface is subjected to the cleaning treatment, dipping in the modified silicon dioxide sol for film coating through the czochralski method to form a primary coating and to obtain a micro-nanometer grade coarse structure which is similar to taro leaf; after drying, dipping in addition type liquid silicon rubber sol for secondary film coating through the czochralski method, and then placing into an oven for heat treatment at a temperature of 100-120 DEG C; and obtaining a transparent super-hydrophobic coating after subjecting the primary coating with the micro-nanometer coarse structure to the secondary film coating modification by the liquid silicon rubber with low surface energy.

A spark plug for an internal combustion engine is disclosed having a metal shell having an outer periphery formed with a mounting thread, a porcelain insulator fixedly secured to the metal shell on a central axis thereof, a center electrode retained within the porcelain insulator along a central axis thereof with a distal end located outside the porcelain insulator, and a ground electrode joined to the metal shell and having an end associated with the distal end of the center electrode to define therebetween a spark discharge gap. The ground electrode includes a facing surface intersecting the central axis of the center electrode and having a width equal to or less than 1.6 mm.

The invention discloses a novel long rod type porcelain composite insulator. The long rod type porcelain composite insulator comprises an insulator body, wherein an outer insulating umbrella skirt sheath is arranged outside the insulator body; hardware fittings are cemented at two ends of the body; a mounting inner hole of each hardware fitting is in a sawtooth shape; and the outlet end of each hardware fitting is in a circular arc shape, and a rectangular groove is formed outside the outlet end. Due to the adoption of reasonable structural design and high-quality production raw materials and the selection of an advanced manufacturing process, the long rod type porcelain composite insulator has high electromechanical properties. According to the long rod type porcelain composite insulator, high-temperature vulcanized silicon rubber is used as the outer insulating umbrella skirt sheath, high-strength ceramic is used as internal insulation, and the end fittings are cemented by using high-strength silicates through a amplitude varying process to manufacture the porcelain composite insulator. By the porcelain composite insulator, the accidents of brittle failure and string breakage can be avoided, and the problem of external insulation pollution flashover of the porcelain insulator is solved, so that the long rod type porcelain composite insulator is high in mechanical and electrical properties and is suitable for various extremely severe work conditions.

A spark plug is provided which is designed to be compact without sacrificing a mechanical strength of a porcelain insulator. The spark plug includes a metal shell having a base end and a top end. The porcelain insulator is made of a hollow cylinder which includes a body and an insulator head. The body is retained within the metal shell. The insulator head extends from the base end of the metal shell in a lengthwise direction of the porcelain insulator and has a length made up of a major body leading to the body of the porcelain insulator and an end portion lying far away from the body. The major body has an outer diameter D1, an inner diameter D2, and a section modulus Z at a smallest-outer diameter portion thereof which meet relations of 7.1 mm≦D1≦8.8 mm, D2≧2.8 mm, and Z≧33 mm3.

The invention discloses brace porcelain insulator ultrasonic flaw detection method. It includes the following steps: emitting SH wave to detected surface; using transversal wave couplant for the probe and the detected surface; using the probe to check the detected surface; using porcelain insulator test piece to adjust probe reference sensitivity and checking sensitivity; detecting the reflection wave of the detected surface, recording the one which reaches defect setting value as defect signal; measuring the defect length; judging the work piece recorded with defect signal as waste. The invention also discloses the defect detecting probe of which emitted ultrasonic is SH type transverse wave. The method has high sensitivity, reliability, and large detecting range. Meanwhile the special probe has little size which can ensure detecting sensitivity and increase porcelain vase retrievable rate at the same time.

The invention relates to a method for detecting factors influencing a mechanical life of a support porcelain insulator. The method for detecting the factors influencing the mechanical life of the support porcelain insulator comprises the following steps: step 1, support porcelain insulator mechanical performance measurable indicators and life influencing factors which are planned to conduct quantitative evaluation are confirmed; step 2, a level range is chosen so as to generate a factor level execution table according to the influencing factors; step 3, orthogonal tables capable of inspecting each level of the factors are chosen, and orthogonal test steps are confirmed; step 4, relative tests according to required test conditions of each test number are carried out in sequence, and test data are recorded; step 5, the test data are analyzed, optimal factor combinations and a primary and secondary sequence of each influencing factor are confirmed, and whether influences of functions of each factor upon indicators are notable or not is judged; and step 6, a model for quantitative evaluation of the factors affecting the mechanical life of the support porcelain insulator is built according to test results. The method for detecting the factors influencing the mechanical life of the support porcelain insulator has the advantages of reducing test numbers, improving test subject utilization rate, and obtaining the rule of influence of each factor upon the indicators accurately.

A spark plug for an internal combustion engine is provided which includes a hollow cylindrical metal shell with an open end portion to be exposed to a combustion chamber of the engine, a ground electrode joined to the metal shell, a center electrode disposed in the metal housing to define a spark gap between itself and the ground electrode. The spark plug also includes a stream shaper or a stream reflector geometrically formed on the metal shell and / or the porcelain insulator to shape a vortex steam of air-fuel mixture into a stream thereof which is oriented outside the spark plug or serves to decrease the amount of the air-fuel mixture into a pocket between the metal shell and the porcelain insulator. This ensures the stability of ignition of the air-fuel mixture.

The invention discloses a super strength silicate cement adhesive and a preparation method thereof. The adhesive is mainly prepared from the following raw materials in percentage by weight: 30 to 40 percent of cement, 25 to 43 percent of quartz sand, 9 to 24 percent of micro aggregates, 0.9 to 2 percent of water reducing agent and 11 to 14 percent of water. The preparation method comprises the following steps of firstly, uniformly mixing the cement, the micro aggregates, the water reducing agent and the quartz sand, then continuously stirring for 4 minutes and immediately forming after taking out the mixture; after the obtained product is formed, placing the obtained product into a curing box at the temperature of 35 DEG C to carry out steaming-curing under the humidity of not lower than 95 percent, demoulding after 4 to 12 hours, and placing a demoulding specimen into hot water at the temperature of 45 to 80 DEG C to carry out curing for 48 to 96 hours; and finally, testing the qualification of the product to obtain the cement adhesive. The cement adhesive disclosed by the invention has the excellent performances of excellent compaction, high strength, excellent durability and the like, is suitable for electrotechnical porcelain products such as a high-tonnage suspension type porcelain insulator and the like and has low cost.

A spark plug for an internal combustion engine is provided which has a center electrode made up of an oxidation resistant alloy-made portion and a thermal conductive metal-made portion. The oxidation resistant alloy-made portion occupies at least a top portion of the center electrode exposed outside a porcelain insulator. The thermal conductive metal-made portion is exposed to a portion of an outer periphery of the center electrode which faces a insulator mount portion of a spark-mounting shell through the porcelain insulator in a direction perpendicular to an axial direction of the center electrode, thereby facilitating transfer or dispersal of heat from the center electrode to the mounting shell through the porcelain insulator to ensure a desired heat range.

The invention discloses a method for the selection and the preparation of the raw materials of a high-strength suspension porcelain insulator glaze. The raw materials comprise kaolinite type clay, talcum, feldspar, refined quartz, carbonate, porcelain powder, water glass and calcined alumina. The invention is characterized in that the kaolinite type clay is 10 to 15%, the talcum is 10 to 15%, the feldspar is 25 to 35%, the refined quartz is 25 to 35%, the carbonate is 5 to 10%, the porcelain powder is 1 to 8%, the water glass is 0.1 to 0.5% and the calcined alumina is 10 to 15%. The particle size of each clay raw material is 20 to 40 mushes, the particle size of other raw materials is 180 to 200 mushes. The bending strength of porcelain blank can be improved by 25 to 40% after being glazed by the glaze, the sintering temperature of the porcelain insulator after being glazed is 1200 to 1350 DEG C.

A spark plug for an internal combustion engine is provided which includes a metal shell, a porcelain insulator, a center electrode, a main ground electrode, and auxiliary ground electrodes. Each of the auxiliary ground electrodes has an inner side surface facing the center electrode through the porcelain insulator to define an auxiliary spark gap between itself and a nose of the porcelain insulator so as to occupy a minimum distance between the porcelain insulator and the auxiliary ground electrode. This avoids a great local increase in electrical field strength on the auxiliary ground electrode to minimize excessive discharge within the auxiliary spark gap to enhance carbon fouling resistance and durability of the spark plug.

The invention discloses a low-value insulator detection method based on infrared thermography. The method comprises the following steps: acquiring an infrared thermogram of a to-be-detected porcelain insulator string; after image processing, extracting a grayscale image area of a steel cap part of each insulator sheet to form a grayscale characteristic curve. The quick detection of low-value defects of insulators and the quick positioning of the defective insulators can be realized by detecting whether the grayscale curve of steel caps contains rising distortion points. The low-value degraded insulator detection method provided by the invention is simple in implementation and easy to operate, the defects that current common detection methods are high in labor intensity, strong in subjectivity and likely to influence by the skills of an operator are overcome, and an objective and convenient technical scheme is provided for the state detection of low-value degraded insulators.

The invention discloses a detection device, method and system for internal defects of a ceramic insulator. The method comprises the following steps: applying a light pulse heat excitation function toa ceramic insulator to be tested by using a light pulse heat excitation loading device; acquiring infrared thermal image sequences on the surface of the ceramic insulator to be tested by using an infrared thermal image acquisition device, and carrying out preprocessing such as fitting, compression and reconstruction on the acquired infrared thermal image sequences by using a data processor; according to defect information provided by original infrared heat image sequences obtained through preprocessing, analyzing and comparing data in a characteristic database, so as to obtain defect types andquantitative calculation results of the ceramic insulator. By adopting the detection device, the light pulse heat excitation function is applied to the surface of the ceramic insulator, defect typesare judged and defect information is analyzed according to variations of dynamic temperature fields on the surface of the ceramic insulator, the detection device has the characteristics of rapid measurement, large single-time measurement areas, visible measurement results, non contact, and the like, and related information of internal defects of the ceramic insulator can be accurately, comprehensively and deeply processed and analyzed.

The method comprises: 1) selecting the type of the insulator; 2) measuring the sound speed; 3) selecting the probe; 4) crank detection; 5) automatically tracing; 6) comparing the wave forms; 7) displaying the detection result. By making the intellectualized modification for the original supersonic detector, the invention enhances the detection function and reduces the program for adjusting the metering device.

The invention provides a method, a device and a system for detecting a crack of an insulator. The method comprises the steps of acquiring response signals of a porcelain insulator to be detected and a crack-free porcelain insulator in a modal analysis experiment; establishing a finite element model of the porcelain insulator to perform modal analysis to the porcelain insulator according to the physical property of the porcelain insulator; determining the inherent frequencies of the porcelain insulator to be detected and the crack-free porcelain insulator according to the response signals of the porcelain insulator to be detected and the crack-free porcelain insulator and the finite element model respectively; and determining the crack position of the porcelain insulator to be detected according to the relation of the inherent frequencies of the porcelain insulator to be detected and the crack-free porcelain insulator, the inherent frequency of the porcelain insulator, acquired in advance, and the crack position. According to the invention, the finite element model of the cracked porcelain insulator is established to analyze the influence of different crack positions and crack sizes on the inherent frequency of the porcelain insulator, so that the purpose of detecting the crack of the porcelain insulator is achieved, and the safety and the reliability of the porcelain insulator are improved.

The invention discloses a porcelain insulator forming machine which is characterized by comprising a rack, wherein the rack is provided with a feeding platform and a discharging platform, an outer contour forming station and / or an inner contour forming station are / is arranged on the rack and positioned between the feeding platform and the discharging platform, and a mechanical arm assembly is arranged on the rack; the outer contour forming station comprises at least one core column, a first driver and a tool assembly, and the outlet end of the first driver is fixed with the lower end of the core column; the core column is sleeved with a mud billet, and a center hole is formed in the bottom of the mud billet; the inner contour forming station comprises at least one top pillar, the lower end of the top pillar is fixed with the rack, and a module is arranged at the upper end of the top pillar. When the top pillar is sleeved with the mud billet, the bottom of the center hole of the mud billet and the module are extruded to form a mold cavity surface matched with the module. The porcelain insulator forming machine has high degree of automation, therefore the product quality and the consistency are good, and the labor intensity of operators is reduced.

A spark plug is disclosed as including a metal shell 10 formed with first and second bores 10c, 10d and a stepped section 10e between the first and second bores, and a porcelain insulator 20 having a largest-diameter section 20d, which is accommodated in the first bore and a small-diameter section 20e accommodated in the second bore. The first and second bores of the metal shell have a dimensional relationship, lying in a value equal to or less than 1.8 mm, which is expressed as (D1−D2) / 2 where D1 represents an inner diameter of the first bore of the metal shell and D2 represents an inner diameter of the second bore of the metal shell.

The invention discloses a single-hook lifting device for a switch blade porcelain insulator. The single-hook lifting device comprises a lifting hook, a power mechanism, a suspension arm, a first support rod, a limitator, a first fixing device, a second support rod and a cross rod, wherein one end of the second support rod is vertically fixed on a switch blade bracket through the first fixing device; two ends of the cross rod are fixed on two switch blade constant-diameter rods, and the cross rod is fixed with the other end of the second support rod; the lower end of the first support rod is inserted into the second support rod, and is fixed with the second support rod through the limitator; one end of the suspension arm is rotationally fixed at the top end of the first support rod through a bearing; and the power mechanism is fixed at the end part of the other end of the suspension arm, and the lifting hook is arranged on the power mechanism. The single-hook lifting device can be used in a finite space, is simple and convenient to adjust in height, ensures the safety and the reliability in lifting the switch blade porcelain insulator, has a high operating efficiency, and solves the difficult problem that lifting cannot be carried out since the safety distance between a crane and electrified equipment on a reformation site is not long enough.

The invention discloses a dual-drive cable terminal fastening device. The device comprises a line ball body, a dynamic pressure block, a compression screw rod, a driven gear and a driving gear. The driven gear and the driving gear are movably installed in the top of the line ball body and rotate freely. The inner surface of the driven gear is connected with a fastening screw rod in a threaded connection way. The outer surface of the driven gear is intermeshed with the outer surface of the driving gear. The reciprocating motion of the compression screw rod relative to the bottom of the line ball body is adjusted by rotating the driving gear. A fastening cable clamp comprises a U-shaped male clamp and a female clamp. The back of U-shaped male clamp is tightly matched with the lower surface of the dynamic pressure block. The back of the female clamp is tightly matched with the bottom of the line ball body. The matched non-return self-locking mechanism is disposed in the U-shaped male clamp and female clamp, and can be rapidly matched and locked to enable the U-shaped male clamp and female clamp to tightly clamp a cable. The fastening device with two modes of operation is labor-saving, can compress cables round street codes and porcelain insulators together rapidly, and fasten fixedly the bended ends of cables by the fastening cable clamp installed on the device.

The invention discloses a preparation method of high-strength electroceramic. The preparation method includes the specific technological steps that 1, the high-strength electroceramic is prepared from, by mass, 20-30 parts of calcined bauxite, 20-30 parts of mullite, 20-35 parts of high plastic clay and 15-25 parts of feldspar; 2, after all raw materials in step 1 are mixed, water is added, ball-milling is conducted, and slurry is obtained; 3, the slurry is subjected to sieving and iron removal, and mud cakes are obtained after pressure filtration dehydration; 4, the mud cakes are subjected to aging for over 24 hours after coarse milling, then the mud cakes are extruded into electrical porcelain wet billets of the required sizes through a vacuum deairing machine, and green bodies are obtained through fettling and drying; 5, the green bodies are placed in a drawer type or tunnel type kiln and sintered at the temperature of 1260-1330 DEG C for 24-48 hours; then cooling is conducted, and high-strength electroceramic products are output from the kiln. The high-strength electroceramic material is wide in raw material source, good in process performance, low in manufacturing cost and particularly suitable for being used for manufacturing high-strength porcelain insulators used for extra-high voltage and super-high voltage power transformer lines and power stations.

A spark plug for an internal combustion engine and related manufacturing method are disclosed having a metal shell, a porcelain insulator, a center electrode and a ground electrode. The center electrode includes a substantially columnar shaped base material body, and a substantially square shaped rod-like Ir alloy tip bonded to a leading end portion of the base material body. The leading end portion has a diameter D2 smaller than a diameter D1 of the base material body. The Ir alloy tip has a square shape with a long diagonal line supposed to form a diameter A of a circumscribed circle CA of the Ir alloy tip whose inscribed circle CB is coaxial with the circumscribed circle CA and has a diameter B, with four diameters A, B, D1 and D2 lay in the relationship expressed as D1>A>D2>B.

An alumina compound sintered compact, having a principal component of alumina, a method of manufacturing the same, and a spark plug employing such an alumina compound sintered compact are disclosed. The alumina compound sintered compact contains alumina, mullite, zircon, zirconia and a specified metal oxide composed of an oxide of at least one element selected from Group III elements excepting Mg, Ca, Sr, Ba and actinoid, wherein the alumina compound sintered compact contains 0.5 to 10 total parts by weight of mullite, zircon and zirconia, 0.5 to 10 parts by weight of the specified metal oxide and a balance of substantially alumina based on 100 parts by weight in total. The spark plug for an internal combustion engine includes a porcelain insulator made of the alumina compound sintered compact.

A spark plug is disclosed as having a metal shell, a porcelain insulator fixedly secured to the metal shell, a center electrode and a ground electrode providing a spark discharge gap with the center electrode. The porcelain insulator has a through-bore partially exposed from an end face of the ground electrode in a surface area S1, as viewed from a distal end of the spark plug, and having a total surface area S2 falling in the relationship S1 / S2≦0.3. The center electrode protrudes from the porcelain insulator with a protruding length L under the relationship L≦0.6 mm. A minimal value Hmin and a maximal value Hmax in distance between the ground electrode and the end face of the porcelain insulator lies in the relationship Hmax / Hmin≦1.3. Wall thickness T between the through-bore and an outer periphery of the porcelain insulator lies in the relationship T≦0.7 mm.

The invention discloses a preparation method of rod porcelain insulator. The preparation method comprises the following working procedures: raw material ball milling, sieving and deironing, spray drying and pelleting, isostatic forming, fettling, glazing and firing, wherein the working procedure of firing comprises a low temperature stage, an oxygenolysis stage, a high temperature stage and a cooling stage, and the cooling stage of the working procedure of firing comprises a specific cooling process. The preparation method disclosed by the invention is simple in operation, and interior stress of the rod porcelain insulator can be effectively removed.

The invention belongs to measuring devices for high-voltage appliances, and particularly relates to an insulation test device for a porcelain insulator. The insulation test device comprises ropes and rods, capable of being fixed to the insulator, of a megger test probe. The insulation test device comprises a first vertical supporting rod and a second vertical supporting rod. The first vertical supporting rod is connected with one end of a horizontal supporting rod through a universal ball, pulleys are arranged on two sides of the body of the horizontal supporting rod, the other end of the horizontal supporting rod is connected with the second vertical supporting rod, and an upper clamp ring and a lower clamp ring are respectively arranged at the upper end and the lower end of the second vertical supporting rod. Each clamp ring consists of two semicircular rings connected by springs, one end of each semicircular ring is connected with the second vertical supporting rod, and measuring heads are arranged on the inner walls of the ends of the semicircular rings and are connected with the megger. Pins are arranged on the outer walls of the semicircular rings and connected with one ends of the ropes, and the ropes are wound on the pulleys. The other ends of the ropes are connected with a take-up device arranged on the first vertical supporting rod. The insulation test device can be used for rapid and effective insulation test of single insulators forming a porcelain insulator string.

An ignition system has a spark plug and a positive voltage applying unit. The spark plug includes a central electrode, a porcelain insulator for holding the central electrode, a main metallic shell for holding the porcelain insulator, and a ground electrode electrically connected to the main metallic shell. The positive voltage applying unit applies a positive voltage to the central electrode of the spark plug in comparison with the ground electrode, so that an ignition high voltage is applied between the central electrode and the ground electrode. In the spark plug, a spark discharge gap is formed between the ground electrode and a distal end portion of the central electrode. The ground electrode is positioned so that a rear edge of a mating face opposed to a peripheral side of the central electrode is positioned in the side of the distal end of the central electrode in comparison with an end face of the porcelain insulator.