52results about How to "Demagnetization" patented technology

The invention discloses an aluminum bronze. The aluminum bronze comprises the following components in percentage by weight: 9.0-18.0% of aluminum, 2.0-7.0% of iron, 1-5% of manganese, 0.01-1% of zinc and the balance of copper and inevitable impurities. The aluminum bronze has the following advantages that through utilizing specific element ratio, specific processing mode and composition, the tensile strength of the aluminum bronze can reach above 700 MPa, the Brinell hardness (HB) of the aluminum bronze is 300-400, and the compressive strength of the aluminum bronze is above 1000MPa; the aluminum bronze has high wear resistance; the friction coefficient of the aluminum bronze is less than 0.15, so that scratched products and adhered products cannot be caused; the alloy has good hot working character; the alloy has high anti-softening temperature; and the aluminum bronze is not added with noble elements such as Ag and Ni, does not need to be thermally treated, and the raw material and production costs are lowered.

The invention discloses a preparation method of a composite metal alloy coating layer and spraying equipment, and belongs to the technical field of surface engineering. The composite metal alloy coating layer comprises a first coating and a second coating which are connected with each other. The preparation method comprises the following three steps: (1) adopting a Cu alloy, an Al alloy or a Zn alloy as thermal spraying raw material powder, and spraying the thermal spraying raw material powder in the molten state onto the surface of a pretreated substrate at a first preset speed so as to formthe first coating; (2) baking stainless steel powder in an oven for 2 hours or longer so as to eliminate magnetism between the stainless steel powder; and (3) adopting the stainless steel powder subjected to magnetism elimination as cold spraying raw material powder, and spraying the cold spraying raw material powder onto the outer surface of the first coating at a second preset speed so as to form the second coating. Consequently, the stainless steel powder can be sprayed onto the substrate through cold and thermal spraying method by utilizing the step (1) to the step (3), and then the surface properties of the substrate can be improved.

The invention provides an electromagnetic refrigerating refrigerator, and belongs to household appliances; the refrigerator comprises a shell, a metal circulating pipeline section is arranged on the shell, a part of the circulating pipeline is arranged at the interior of the shell, and the other part of the circulating pipeline is arranged on the exterior of the shell; the external part of the shell is composed of an iron tube, the internal part of the shell is composed of a copper pipe or an aluminum pipe, the circulating pipeline is filled with a magnetic fluid, and the circulating pipeline is connected with a circulating pump in series; the circulating pipeline arranged on the exterior of the shell is wound with a solenoid, and a heat dissipation gap is left among circles of wires in the solenoid; and the refrigerator provided by the invention has the advantages that the refrigerator utilizes a magnetic refrigeration principle to refrigerate, the refrigerator has no refrigeration noise, the stoppage is not easy to occur, the volume is small, and the magnetizing efficient is high.

The invention discloses a multifunctional nut chip removal machine which comprises a discharging hopper, a conveying belt, first magnets, a scraping plate, a magnetic eraser, a second magnet, a containing screen, a base, springs, a vibrator, a motor, brushes, an air blower and a collection box. The conveying belt with the upwarped output end is arranged below the discharging hopper. The outlet endof the discharging hopper is located over the input end of the conveying belt. The multiple first magnets distributed at equal distance are embedded on the belt face of the conveying belt. The obliquely-arranged scraping plate is arranged below the output end of the conveying belt. The magnetic eraser is fixedly arranged at the bottom of the scraping plate. The second magnet is arranged at the position, located on the downstream portion of the scraping plate, below the conveying belt. The containing screen with the outlet end arranged obliquely downwards is arranged under the lower end of thescraping plate. Compared with the prior art, chip removal can be fast and efficiently carried out on a nut, the chip removal efficiency and effect to the nut are improved, the labor intensity of workers is reduced, and great convenience is brought to nut machining.

The invention provides a magnetic fluid refrigerating refrigerator, and belongs to household appliances; the refrigerator comprises a shell, a metal circulating pipeline section is arranged on the shell, a part of the circulating pipeline is arranged at the interior of the shell, the other part of the circulating pipeline is arranged on the exterior of the shell, and the external part of the shell is composed of an iron pipe; the internal part of the shell is composed of a copper pipe or an aluminum pipe, the circulating pipeline is filled with a magnetic fluid, and the circulating pipeline is connected with a circulating pump in series; and the circulating pipeline arranged on the exterior of the shell is tightly attached to a permanent magnet along the circulating pipeline. The refrigerator abandons a compressor refrigeration system of a traditional refrigerator and adopts a magnetic refrigeration system; compared with a refrigerating ring type magnetic refrigeration system, the refrigerator provided by the invention has the advantages of small volume, good magnetization effect, and good refrigerating efficient.

The invention discloses high-strength metal ceramic used for cutting a nonferrous metal sheet and a preparation method thereof. The preparation method includes the following steps that a, original TiC powder, original Mo powder, original Ni powder and NbC powder are taken and ground through a ball milling medium for 48-64 h, and then slurry is obtained, specifically, the average fisher particle size of the original TiC powder is not greater than 1.0 [mu]m, and the mass ratio of the original TiC powder is 44%-46%; the average fisher particle size of the original Mo powder is not greater than 1.0 [mu]m, and the mass ratio of the original Mo powder is 14%-16%; the average fisher particle size of the original Ni powder is not greater than 1.0 [mu]m, and the mass ratio of the original Ni powder is 38%-40%; the average fisher particle size of the NbC powder is not greater than 1.0 [mu]m, and the mass ratio of the NbC powder is 0.8%-1.2%; the ball milling medium comprises hard alloy bar balls and absolute ethyl alcohol, or comprises hard alloy bar balls and No.120 aviation gasoline; b, the slurry obtained through the step a enters a stainless steel container through a stainless steel screen; and c, after the slurry is subjected to standing in the stainless steel container for 24 hours and under the condition that the ball milling medium comprises the hard alloy bar balls and the absolute ethyl alcohol, the absolute ethyl alcohol on the upper layer of the slurry is taken out.

The invention discloses a method for improving the surface cleanliness of a spring. The method comprises the following steps that demagnetizing is conducted for the first time, specifically, the spring is demagnetized through a demagnetizing machine; shot blasting is conducted, specifically, the spring is subjected to shot blasting through a shot blasting machine; heat treatment is conducted, specifically, the shot-blasted spring is tempered; demagnetizing is conducted for the second time, specifically, the spring is demagnetized through the demagnetizing machine; and hydrocarbon cleaning is conducted, specifically, the spring is cleaned through a hydrocarbon cleaning machine. According to the method, magnetism, residual stress and a surface oxidation layer, grease and dirt of the spring can be eliminated timely, and blind hole parts, concave parts, small gaps and other parts of springs and special-shaped golden parts are effectively cleaned; meanwhile, pollution and noise are avoided, batch assembly-line operation can be achieved, the machining efficiency is high, the cleaning quality is high, the requirement for the cleanliness standard is met; and meanwhile, damage to the spring is avoided, product performance is improved, the appearance requirement is met, a large amount of labor is saved, labor intensity is reduced, and the economic benefits are improved.

The invention relates to a welding material, in particular to a lead-free solder in the field of submerged-arc welding. The lead-free solder comprises, in weight percent, 0.2-0.8% of Cu, 0.075-0.5% of Ni-V alloy particles, 0.1-1.2% of nano ZrO2 particles and the balance Sn. The invention further relates to a preparation method which includes the steps: uniformly mixing components of the lead-free solder according to the mass ratio and then placing the components into an Al2O3 crucible; placing the crucible in a 400-600 DEG C resistance furnace for smelting; keeping the temperature for 100min to 200min after complete smelting; sufficiently stirring the components after keeping the temperature; discharging the components and pouring the components into a solder bar mould; cooling the components to obtain a lead-free solder bar. The lead-free solder has the advantages that wetting property is fine, electromagnetic induction is not generated, the lead-free solder has a fine creep performance and resistant to oxidation and the like.

The invention relates to a push rod device for an electromagnet, in particular to a push rod device for the electromagnet, which can eliminate residual magnetism instantly without remaining the residual magnetism after power turn-off and effectively control the flexibility and the stability of the electromagnet. The push rod device for the electromagnet comprises two separated sections, namely thepush rod is divided into a push rod main body and a connector, wherein the push rod main body is made of a high-carbon steel material, the head of the main body is provided with a fixed column, and the push rod main body is provided with an air discharge duct from top to bottom; and the connector is made of a copper material, the lower end of the connector is provided with a connecting hole, thefixed column is arranged in the connecting hole, and the push rod main body and the connector are fixed together by stamping. Thus, the push rod device for the electromagnet has the advantages of reasonable structure, high stability and strong reliability, can eliminate the residual magnetism instantly, and can effectively control the flexibility of the electromagnet.

The invention discloses a cartridge for purifying a PCR product. A through hole is formed in an upper cover of the cartridge, a magnetic sheath is arranged in the through hole, an annular bulge is arranged in the middle of the magnetic sheath, a spring is sheathed on the magnetic sheath on the lower part of the annular bulge, a metal bar is arranged in the magnetic sheath, a sphere with the diameter slightly smaller than the inner diameter of the magnetic sheath is arranged at the bottom of the metal bar, the upper end of the metal bar extends out of the upper cover, the lower end of the metalbar is inserted in the bottom of the magnetic sheath, and the metal bar can drive the magnetic sheath to move up and down; and a plurality of centrifugal pipes are arranged on a base. Under the action of an outside magnetic field, the metal bar can generate magnetism which can be completely eliminated after the outside magnetic field is removed. Through the up-down movement of the metal bar and the magnetic sheath, the grab and release of magnetic beads can be completed, the capture, washing and rinsing of nucleic acid can be realized through simple operation, and finally, the purified PCR product can be obtained, the influence of aerosol escape generated during the purification process of the PCR product on the environment can be avoided.

The invention provides low-melting-point lead-free solder alloy. The low-melting-point lead-free solder alloy comprises, by weight, 10%-30% of bismuth, 0.6%-1.8% of silver, 0.3%-0.8% of nano iron sesquioxide particles, 0.02%-0.1% of vanadium and the balance tin. The low-melting-point lead-free solder alloy is very low in melting point, good in wetting performance and shearing resistance and low in silver content and cost.

The invention relates to the field of dried tofu processing equipment, in particular to an automatic dried tofu collecting device. The automatic dried tofu collecting device comprises a collection box, a transmission mechanism and a containing box located on the upper face of the transmission mechanism. The collection box is located on the upper portion of the containing box, and a movable overturning plate in hinged joint with the collection box is arranged at the bottom of the collection box. The automatic dried tofu collecting device is characterized in that a pressure sensor and a control circuit are arranged on the upper face of the movable overturning plate, and an automatic adjusting part is arranged at the lower end of the movable overturning plate; the automatic adjusting part comprises a supporting frame serving as a supporting point, an adjusting plate located on the upper face of the supporting frame, and a metal balance block; an elastic piece is arranged on the upper face of the metal balance block, and an electromagnet is arranged at the end, located below the metal balance block, of the adjusting plate; and the electromagnet is electrically connected with the pressure sensor and the control circuit. By means of the lever principle, the adjusting plate moves vertically around the supporting frame, and thus the effect of automatically collecting dried tofu is achieved.

The invention discloses a manufacturing method for remanence-free mold steel and relates to the technical field of metallurgy. The method comprises the following steps: performing normalizing thermaltreatment on a rolled steel plate, wherein the heating temperature is 880-900 DEG C, the heating rate is 1-1.5 min/mm and the insulating time is 0.6-1.0 min/mm; setting reasonable heating temperature,heating rate and insulating time of tempering thermal treatment according to different mold steel types; adopting a vacuum chuck or jig for performing all the transporting processes after thermal treatment, and meanwhile performing remanence test on head, middle and tail parts of the steel plate, thereby meeting the magnetic requirement of the steel plate. According to the invention, the thermaltreatment technology for the rolled mold steel is optimized for eliminating the magnetism of the mold steel, and meanwhile, the devices, such as the vacuum sucker and the jig, are equipped in the hoisting and transporting processes, and the requirement for remanence-free performance is met.

The invention relates to the technical field of a welding machine, particularly a PWM pulse width type constant current charging type capacitor energy storage welding charging control system. The charging control system comprises a three-phase charging transformer, a single-phase charging transformer, a rectifying circuit, a DC-LINK filtering circuit, a PWM charging control part, a charging current detection part, a welding transformer, a discharging circuit, a discharging switch-off circuit, a discharging current detection part, a discharging control part and a capacitor bank; no matter the input power supply is in single phase or three phases, the input power supply can be controlled by the same controller; by adoption of the PWM pulse width modulation mode the precision can be improvedby 10 times or more (counted by 1,000HZ) compared with an SCR adjustment mode; by adoption of a hall current sensor, the charging current can be sampled in real time, and then the PWM pulse width is adjusted, thereby realizing constant current control; and charging and discharging are both realized by adopting the welding transformer, and the charging current direction and the discharging currentdirection are opposite, so that magnetization of the transformer can be prevented effectively.

The invention discloses a spinning cotton cleaner capable of adjusting the material quantity, and belongs to the technical field of spinning. The spinning cotton cleaner capable of adjusting the material quantity comprises a feeding bin, a material storage box and an operation case, wherein the outer wall of the feeding bin is fixedly connected with the outer wall of the material storage box; a telescopic column is arranged in the material storage box; one end of the telescopic column is fixedly connected with the inner wall of the material storage box; a squeezing plate is fixedly installed at the other end of the telescopic column; a discharging device is arranged at the bottom of the squeezing plate; the outer wall of the discharging device is fixedly connected with the inner wall of the material storage box; and a material conveying wheel is movably installed on the inner wall of the material storage box. The discharging amount and the discharging speed of cotton can be controlledthrough the rotating opening and closing degree of rotating blades; cotton feeding can be controlled according to the actual situation; the cotton feeding speed can be further controlled through the material conveying wheel, and the cotton is opened; and the squeezing plate squeezes the cotton to increase the discharging amount of the cotton in the material storage box, so that the cotton is prevented from remaining on the discharging device.

The invention discloses a square tube cutting machine. The square tube cutting machine comprises a worktable. The worktable is provided with a drive device, a double-cross universal joint and a shearing device. The drive device is connected with the shearing device through the double-cross universal joint. The drive device comprises a supporting block and a motor located on the supporting block, and the supporting block is arranged on the worktable in a sliding mode. The shearing device comprises a shearing piece, a rotary shaft and a lifting component, the rotary shaft is located in the center of the shearing piece, and the lifting component is located at the upper end of the shearing piece and connected with the rotary shaft. The lifting component comprises a shell, an iron plate is arranged in the shell and matched with the inner wall of the shell, and two connection columns are arranged between the lower surface of the iron plate and the rotary shaft. The two connection columns are located on the two sides of the shearing piece respectively and connected with the iron plate and the rotary shaft. A spring is disposed between the upper surface of the iron plate and the upper wall of the shell. An electromagnetic block is arranged on the upper wall of the shell and connected with an electric control box through a circuit. Square tubes are prevented from being bent after being cut off, cost is reduced, and work efficiency is improved.

The invention discloses an automatic iron nail and scrap iron dispersing and collecting device used after iron nail polishing. The device comprises a machine body, wherein a feeding port is formed in the top end of the machine body, a controller is arranged on the side wall of the machine body, an inspection window is formed in the front face of the machine body, an iron nail discharging box and an scrap iron discharging box are arranged at the bottom end of the machine body; the controller is connected with a generator arranged on the inner wall of the machine body, a bidirectional moving rod is arranged at the bottom end of the generator, and a pushing rod matched with the bidirectional moving rod is arranged on the bidirectional moving rod. The device has the beneficial effects that the iron nail polishing process is completed through the electromagnetic induction technology and several separation devices, iron nail and scrap iron mixture is separated, iron nails and scrap iron are still attracted together through static electricity after separation, the magnetism between the iron nails and the scrap iron is eliminated through heating of the electromagnetic induction technology, then better separation is carried out, the flow of the iron nails and the scrap iron can be controlled in the separation process, the automation degree is high, and the better separation effect is achieved.

The invention discloses a multi-index physical fitness integration evaluation device and method based on the Internet, belongs to the technical field of physical fitness evaluation, and aims at solving the problems that in the existing integration evaluation process, efficiency is low, and heat generated by the whole is difficult to dissipate. Through the auxiliary receiving mechanism, the external connection mechanism, the internal connection mechanism and the processing module, the auxiliary receiving mechanism is connected with the external connection mechanism, the main shell is connected with the internal connection mechanism, and the electronic element is connected with the processing module; to-be-queried target information is input through the information manual input module, the result is displayed through the information display module, intelligent voice query can be carried out through the intelligent question and answer module, the result is broadcasted through the voice broadcast module, the efficiency of the whole evaluation process is improved, and the user experience is improved. And meanwhile, personal query can be carried out according to the information manual input module and the intelligent question and answer module, so that later use is facilitated.