79results about How to "Good filling performance" patented technology

The invention relates to an air suction and mechanical auxiliary planting combined type corn precision seed-metering device and a seed metering method thereof. The air suction and mechanical auxiliary planting combined type corn precision seed-metering device is characterized by comprising a round bottom casing provided with an air suction port and an air pipe, an inner cavity of the bottom casing is provided with a sealing gasket with an arc-shaped groove, and the air suction port is located in the arc-shaped groove. One side of a seed metering plate is rotatably attached to a side wall of the arc-shaped groove, the other side of the seed metering plate is provided with a seed supporting plate, the seed metering plate is a disk with the circumference provided with a plurality of round suction holes, the seed supporting plate is an annular plate with the circumference provided with a plurality of indent clamping openings, and each round suction hole corresponds to each indent clamping opening in a one-to-one mode. The seed metering plate is driven by a transmission mechanism to rotate relative to the bottom casing, and an upper cover is arranged on the outer side of the seed metering plate and fixed on the bottom casing. A cavity arranged between the upper cover and the seed metering plate is divided into a seed filling area, a seed clearing area and a seed metering area, a seed clearing knife is arranged in the seed clearing area, and a seed discharging knife and a seed guiding plate are arranged in the seed metering area. The air suction and mechanical auxiliary planting combined type corn precision seed-metering device is simple in structure, can effectively solve the problems that an air suction type seed-metering device is high in seeding absence rate and the seeding absence at the edge of a field is severe, and can be widely applied to a corn precision seeding process.

The invention relates to an air power collecting and discharging type precision seed sowing device, which is characterized by comprising a shell, a sealing cover plate, a seed sowing roller, a pressure relief wheel, a seed bed screen, a seed cleaning shifting finger, a seed guiding pipe, an impurity collecting plate and a seed stopping plate, wherein the shell is connected with the sealing cover plate by virtue of bolts, the seed sowing roller is arranged in the shell to form an operation air chamber, an air supply chamber and a seed chamber, the seed chamber is internally provided with an air supply pipe, the seed bed screen is arranged at a critical position of the air supply chamber and the operation air chamber, and the air supply chamber provides air flow for the operation air chamber by virtue of the seed bed screen and the air supply pipe; the seed cleaning shifting finger is arranged in the operation air chamber, is close to the roller in a gap and is in an L shape, a shorter side of the seed cleaning shifting finger is in a right trapezoid shape, and relative position between a bevelled edge of the trapezoid and a seed attaching hole can be adjusted by virtue of a seed cleaning shaft fixedly connected with the shorter side; the pressure relief wheel is arranged inside the seed sowing roller and is close to the interior of the roller by virtue of a tension spring; and the inlet of the seed guiding pipe is close to the roller in the gap and is dead against a contact point of the pressure relief wheel and the roller. The precision seed sowing device realizes centralized precision seed sowing, seed attaching pressure difference and a seed sending air flow are provided by virtue of a positive pressure system, a seed layer is disturbed by utilizing the air flow, and seed filling probability is improved. The precision seed sowing device is applicable to precision seed sowing of large-row-spacing crops such as corn and soybean.

The invention relates to a pneumatic combined plate type single seed precision seed metering device, which comprises a shell. A seed inlet, an air inlet, and a seeding port are formed on the shell, and a seed cleaning piece and a seed pushing piece are fixed in the shell; a seed plate is arranged in the shell and consists of a plate center, a rubber indent belt, and an outer ring which are sleeved; and holes are formed at the peripheries of the plate center, the rubber indent belt, and the outer ring at interval correspondingly. A circle of strip-shaped groove is formed on the inner side of the circumference of the plate center; the rubber indent belt is provided with a hemispherical indent; a cross slot is formed at the bottom of the indent; and a conical hole is formed on the outer ring so as to be naturally connected with the indent. The seed cleaning piece is close to the seed inlet and can slide in the plate center groove and cannot pass through the cross slot at the bottom of the rubber indent. The seed pushing piece is close to the seeding port and can slide in the plate center groove and pass through the cross slot at the bottom of the rubber indent; a seed brush is tangential to the outer ring of the seed plate; and a brush axle is parallel to a transmission shaft of the seed plate. The seed metering device is also provided with a seed blocking piece and a seed protection rubber piece. The pneumatic combined plate type single seed precision seed metering device effectively guarantees the links of filling seeds, cleaning the seeds, protecting the seeds and discharging the seeds, and realizes precision seeding.

The invention discloses a blind via filling plating method using different current parameter combinations, which belongs to the field of circuit board plating technology. The blind via filling plating method comprises the steps of (1) removing adhesive, chemically depositing copper and flash-plating copper; (2) filling a blind via and plating; (3) drying film. The step (2) specifically includes regulating a plating solution to a solution containing high copper sulfate and low sulfuric acid content; and conducting plating for three periods of time using different current densities, wherein the plating operation is conducted for 30 minutes at the first period of time using a current density of 1.5 to 2.5 A / dm<2>, for 23 to 35 minutes at the second period of time using a current density of 1.2A / dm<2>, and for 10 to 20 minutes at the third period of time using a current density of 1.5 to 2.5A / dm<2>, respectively. The blind via filling plating method provided by the invention has high processing efficiency, low cost, and high processing quality, and is used for plating and blind via filling of circuit boards.

The invention relates to a mechanical / pneumatic combined internal-charging type precision corn seed sowing device which is characterized by comprising a flat-plate-shaped seed sowing device underpan, a concave disk-shaped structure seed sowing tray, a semicircular-like isolation plate fixed on the underpan, a transmission shaft, an air inlet hole, a seed sowing port and a seed inlet port, whereinthe outer edge on the inner side of the seed sowing tray is provided with a circle of bosses in the circumferential direction, the bosses rotatablely abut against the underpan, a cavity is formed between the concave part of the seed sowing tray and the underpan; the bosses are provided with a plurality of hemipyramid grooves at intervals along the circumferential direction, each groove has a bigger upper opening and a smaller lower opening, and the grooves abut against the underpan to form a plurality of pockets; the outer edge of the isolation plate is arranged on the inner edge of the boss;one end of the transmission shaft is fixedly connected with the seed sowing tray, and the other end of the transmission shaft is connected with a power system after penetrating through the isolation plate and the underpan; the air inlet hole is arranged on the underpan at the start end of the isolation plate and partially penetrates through the start end of the isolation plate; the air inlet holeis connected with an air inlet pipe; the seed sowing port is arranged on the underpan below the tail end of the isolation plate; and the seed inlet port is arranged on the underpan which is adjacent to the seed sowing port and far away from the isolation plate and connected with a seed inlet pipe.

The invention belongs to the technical field of agricultural machinery, and particularly relates to an anti-slope spoon type corn precision seed metering device and a seed metering method thereof. A seed metering shell (1) is provided with a square plate (15), an adjusting plate (11) and a seed metering opening (13); a cover plate (2) of the seed metering device is provided with a seed feed opening (21), a seed discharge opening (26), guiding grooves (24), two first convex grooves (25) and a second convex groove (22); a plurality of circular holes (35) are uniformly distributed at intervals in the periphery direction of the outer edge of a seed metering plate (3), a spherical surface shaped spoon body is connected to the surface of each circular hole (35), and semi-closed spaces formed by the spherical surface shaped spoon bodies and a partition board (4) next to the seed metering plate (3) are called seed holding spoons (31); and a plurality of smooth tooth-shaped bulges (61) are distributed in the periphery direction of the outer edge of the top of a circular ring of a rotating wheel (6). According to the anti-slope spoon type corn precision seed metering device and the seed metering method thereof disclosed by the invention, the influence of slope on seed metering properties can be reduced, and besides, the situation that seeds are cracked is effectively avoided; redundant seeds can be well removed, so that the seed metering device has good single-grain properties; and the seed holding space is enlarged, and the seed feeding properties are improved.

The invention relates to a pneumatic composite hole-type maize precision metering device. The pneumatic composite hole-type maize precision metering device is characterized by comprising an upper shell of a seed-metering device, a lower shell of the seed-metering device, a discharge plate, a conveying device, a gas distribution chamber shell, a seed pushing plate, a seed scrapping plate, a seed cleaning wheel and a feed shaft, wherein the upper shell of the seed-metering device and the lower shell of the seed-metering device are buckled together to form a round chamber; the gas distribution chamber shell is arranged on the outer side of the upper shell of the seed-metering device; positive pressure air enters the round chamber through a gas distribution chamber, so that the round chamber is full of positive pressure; the discharge plate is disc-shaped, and a plurality of guide grooves in curved strips type are evenly arranged at the circumference of the outer edge of the discharge plate; chamfering angles are arranged at the edges of the guide grooves; the lower surface of the discharge plate is clung to a seal ring inside an annular groove embedded into the lower shell of the seed-metering device; the combined holes are formed by the guide grooves which are not covered; the seed pushing plate is circular-arc-shaped, a strip plate is arranged at the edge of the lower segment of the seed pushing plate, and the outer edge of the seed pushing plate is tangent with the initial end of each guide groove; convex teeth of the seed cleaning wheel are clamped into the combined holes of the discharge plate to be meshed with the discharge plate, and rotate along with the discharge plate.

The invention provides a secondary seed suction assisting self-disturbance seed discharge plate for an aspirated-air type seed discharge device. The secondary seed suction assisting self-disturbance seed discharge plate comprises a plate body, and a mounting hole, locating holes, seed charge holes, seed stirring grooves and seed removal grooves are formed in the plate body; the mounting hole is formed in the center of the plate body, and the locating holes are formed in the periphery of the mounting hole; the seed charge holes are evenly distributed in the periphery of the plate body, and one seed stirring groove is correspondingly formed in the inner side of each seed charge hole; the seed removal grooves meshed with seed removal wheels of the seed discharge device are formed in the back face of the plate body, and the positions of the seed removal grooves correspond to the positions of the seed charge holes. The seed discharge plate can disturb static seed piles in the operating process, resistance among the seeds can be reduced, the single seed gets rid of constraint of the seed piles and can be adsorbed on the seed discharge plate easily, the seeds which are not adsorbed can be taken to certain height through the seed stirring grooves to fall off, the charge missing seed holes obtain the opportunity of secondary seed charge, therefore, the seed charge performance of the seed discharge device is effectively improved, and sowing missing and empty holes are avoided.

The invention discloses a binding agent which is characterized by comprising the following components in percentage by weight: 0%-22.7% of kaolin, 0.5%-3% of PVA (polyvinyl alcohol), 2%-11% of high-viscosity composite rubber powder, 0.3%-0.7% of hydrochloric acid or oxalic acid, 0.1%-0.6% of formaldehyde, 0.4%-0.7% of ammonia water, 0.3%-0.4% of boric acid, 0.05%-0.15% of boric acid, 0.02%-0.05% water-based defoaming agent, 0.1%-0.3% of preservative and the balance of water. The binding agent disclosed by the invention has the advantages of favorable flowability and favorable viscosity, and can be dried quickly.

The invention discloses a pneumatic direct seeding precision sowing device for rice bud seeds. The pneumatic direct seeding precision sowing device comprises a pneumatic vibration seed box, a profile hole roller mechanism, a seed cleaning mechanism and a seed protective mechanism, wherein the pneumatic vibration seed box comprises a seed box frame, a pneumatic vibrator, an air pressure regulator,a box body, an opening regulating plate and a plate sieve; the profile hole roller mechanism comprises a roller, a negative pressure sealing element and a positive pressure sealing element; a plurality of frusto-conical profile holes of which the insides are provided with suction holes are formed on the outer surface of the roller; an air inlet hollow shaft is fixedly connected with an air outlethollow shaft by a connecting shaft; the positive pressure sealing element is connected with the air inlet hollow shaft by a second thread connecting pipe, and the negative pressure sealing element isconnected with the air outlet hollow shaft by a first pressure sealing element; the seed protective mechanism comprises a seed protective belt support and an elastic seed protective belt; and the seed cleaning mechanism comprises a brush carrier and a seed cleaning brush. The pneumatic direct seeding precision sowing device has a simple and novel structure, solves the problems of the damage to the bud seeds, the stoppage of the profile holes, sowing missing and the like effectively, improves sowing accuracy, can be used for indoor industrial seedling raising and sowing and also can be used for the direct seeding of the rice bud seeds in fields.

The invention relates to an electroplating method for a circuit board. The electroplating method is characterized by comprising the following steps: cleaning; microetching; washing; and electrocoppering. The method is especially effective in preparation of a thin plate with a circuit board thickness of 0.1 to 0.2 mm and a thin plate with a drill hole diameter of 0.15 mm, and the fault rate of the thin plate is 0.

The invention discloses a seed sowing device, and relates to the technical field of agricultural machinery. The seed sowing device comprises a seed box, a seed sowing disc, a seed scraper and a rotary shaft which is connected with the seed sowing disc, wherein the seed sowing disc and the seed scraper are arranged in the seed box, the rotary shaft extends out from the bottom of the seed box; a plurality of seed containing holes are uniformly formed in the seed sowing disc; a seed sowing hole is formed in the box bottom of the seed box; the seed sowing disc is provided with a tapered sleeve having a small upper part and a big lower part; the upper end of the tapered sleeve is sealed; an outer edge at the lower end of the tapered sleeve extends outwards in an axial direction so as to form a circular ring body; the bottom surface of the circular ring body props against the inner bottom surface of the seed box; the top end of the rotary shaft is connected with the upper end of the tapered sleeve; a plurality of support bars are connected between the rotary shaft and the inner wall of the tapered sleeve; a plurality of seed containing holes are formed in the circular ring body; and each seed containing hole is a tapered hole having a big upper part and a small lower part. Compared with the prior art, according to the seed sowing device disclosed by the invention, the rotary frictional force between the seed sowing disc and the seed box is sharply reduced, so that the energy consumption can be reduced; and the seed filling capacity of each seed containing hole is high, so that miss seeding is avoided.

The invention discloses a peanut seed sowing self-disturbance seed discharge disc of a suction seed discharge apparatus. The peanut seed sowing self-disturbance seed discharge disc comprises a disc. Acentral mounting hole is formed in the center of the disc, a plurality of peanut external contour shape fitting spatial stereoscopic seed filling profiled grooves are peripherally uniformly formed inthe front surface of the disc and are close to the edge of the disc, a ventilation hole which is perforated through the back surface of the disc is formed in each seed filling profiled groove, the seed filling profiled grooves are in spatial irregular shapes sunken towards the disc, and in other words, the edges of the seed filling profiled grooves extend towards the upper end surfaces of the ventilation holes to form spatially irregular cones; seed stirring strips are arranged on the front surface of the disc, and each seed stirring strip is arranged in a region between the two correspondingadjacent seed filling profiled grooves; gear teeth which can mesh with gears of driving mechanisms to implement edge driving running are arranged at the peripheral edge of the disc. The peanut seed sowing self-disturbance seed discharge disc has the advantages that resting peanut seed groups can be disturbed by the peanut seed sowing self-disturbance seed discharge disc in operation procedures, resistance between seeds can be lowered, accordingly, the single seeds can be easily broken away from constraints of the seed groups, and the seed filling performance of the seed discharge apparatus can be effectively improved; collision damage of the seeds can be reduced during high-speed rotation, filling missing can be prevented, and the peanut seed sowing self-disturbance seed discharge disc issuitable for the high-speed peanut seed sowing requirements.

The invention discloses a pneumatic type rice hill-direct-seeding centralized seeding device which is composed of a seed box, an outer shell body and a seeding body, wherein the outer shell body is composed of a seed unloading opening, an air inlet, a seed guiding pipe, a seed layer adjusting device, a machine seat, a left end cover, a right end cover, an observing opening plate, a lower outer shell and an upper outer shell; the seeding body composed of a seeding roller, a stopping plate, a rib plate, the air inlet, the seed guiding pipe and a transmission shaft is arranged in the outer shellbody; a hole of the seeding roller is an inclined hole, easiness in filling seeds and feeding seeds is achieved, and accurate rice hill-drop is achieved. The pneumatic type rice hill-direct-seeding centralized seeding device simplifies a seeding process; a modularization design brings convenience to adjustment, installation and disassembling; seed hole forming and accurate seeding are achieved; thus, the seeding device which can achieve accurate rice hill direct seeding is provided.

The invention discloses a variable-suction-hole dual-disc air-aspiration type precise seeding device. The device comprises a seed conveying pipe, a front panel, a front shell body, an air chamber shell body, a seeding plate and an adjusting plate; the seed conveying pipe is installed on the front panel, and seeds flow into a seed filling chamber along the seed conveying pipe under the gravity effect; the front panel is installed on the front shell body and made from a transparent material through cutting, and the seed filling quality is conveniently observed; the front shell body is provided with a seed partition plate, a seed throwing port and a seed discharging port, the seed partition plate partitions a seed filling area and a seed throwing area, the seed throwing port is connected witha seed guiding pipe, and the seed discharging port is used for removing remaining seeds; a negative pressure area with the three quarter arc surface is arranged on an air chamber shell body; an adjustable-seed-hole dual-disc mechanism comprises the seeding plate, an adjustment plate and an adjustment rod, and seed holes are uniformly formed in the seeding plate and the adjustment plate. The variable-suction-hole dual-disc air-aspiration type precise seeding device adopts the superposition combination principle, is simple in structure, meets the universal seed sowing demands of soybeans and corn, and effectively avoids the situation that a seed suction component is detached and assembled many times, so that gas tightness is influenced.

The invention discloses a method for producing a prebaked anode capable of lowering air permeability, and relates to the improvement of the production technology method of the prebaked anode for aluminium electrolysis. The method for producing the prebaked anode capable of lowering the air permeability is characterized by comprising the steps that (1) screening is conducted after calcinations, and screened fine coke powder is subjected to fine grinding again; (2) anode scrap ingredients are added, wherein the diameters of broken anode scraps are 5-15 mm, and the actual density of the broken anode scrapes is larger than 1.55 g / cm<3>; and (3) the specific gravity of green bodies after vibration forming is larger than or equal to 1.64 g / cm<3>. According to the method, calcined coke is partially subjected to fine grinding again, so that the adding and filling performance of the calcined coke is improved, the broken anode scrap diameter and the actual density of the anode scrap ingredients are controlled, the quality of the green bodies is effectively guaranteed, the technical problem that the air permeability in the production of the prebaked anode fluctuates and is high is solved, and the quality of the prebaked anode is improved. The average value of the air permeability of the produced anode is lowered to 0.9 npm from 2.6 npm, and the standard deviation is lowered to 0.4 from 1.863, so that the air permeability of the prebaked anode is greatly reduced.

The invention discloses an electrically-controlled high-speed precision-seeding corn seed sowing device. The seed sowing device comprises a control system assembly, a seed sowing device assembly and a seed sowing device shaft, wherein the control system assembly and the seed sowing device assembly are connected through the seed sowing device shaft, and the control system assembly supplies power to the seed sowing device assembly through the seed sowing device shaft. According to the seed sowing device, a driving force for the seed sowing device is supplied by a motor, so that the phenomenon of seeding absence caused by land wheel skidding or high-speed conditions is avoided, a seed sowing speed and a tractor running speed are uniform and consistent, and the space among plants can be uniform; seed sowing bucket wheels are oppositely mounted in left and right, so that the probability of internal disturbance of seeds in a seed chamber is increased, and the seed-filling effect is improved; due to disaligned mounting, the quality of sowing under high-speed operating conditions is improved, high-speed operating for large farmland is achieved, and the working efficiency is increased.

The invention relates to a halogen-free flame-retardant resin composition and application thereof. The halogen-free flame-retardant resin composition comprises the following components in parts by weight: (A) 40-50 parts of epoxy resin, (B) 5-25 parts by weight of an anhydride compound represented by a formula I in the description, and (C) 50 to 200 parts by weight of a maleimide compound having a weight average molecular weight of 400 to 1000. According to the resin composition, the anhydride compound shown in the formula I and the maleimide compound with the weight-average molecular weight of 400-1000 are added into an epoxy resin system, so that the dielectric property and the heat resistance of a plate prepared from the resin composition can be improved at the same time, that is, the dielectric constant, the dielectric loss factor and the thermal expansion coefficient are reduced, the glass transition internal temperature is increased, the process yield is high, and the prepreg and the laminated board are enabled to have excellent glue filling performance.

The invention provides a manufacturing method of a multilayer board blind hole, buried hole and filled hole packaging substrate. The method comprises the following steps: performing inner layer mechanical drilling, browning, inner layer laser drilling, inner layer glue residue removal, inner layer holing, inner layer hole filling, inner layer circuit, inner layer AOI, browning, outer layer pressing, targeting and edge milling, copper reduction, outer layer laser pre-browning and outer layer laser drilling on a double-sided copper-clad plate to obtain a packaging substrate; performing plasma cleaning on the packaging substrate and blind holes; drilling a non-conducting positioning hole in the packaging substrate; carrying out glue residue removal treatment on the packaging substrate to remove glue residues in the holes and on the surface of the packaging substrate; carrying out hole processing on the packaging substrate, forming a layer of conductive film on the hole wall of the blind hole, and enabling the outermost two layers on the two surfaces of the packaging substrate to be connected through the conductive film in the blind hole and to be connected with the buried hole in the inner layer; and carrying out blind hole filling treatment. By adopting the technical scheme of the invention, the functionality and reliability of the packaging substrate are improved, and a better blind hole filling effect is obtained.

The invention belongs to the technical field of agricultural machinery, and in particular relates to a synchronous low-pressure peripheral air-aspiration type precise seeding device which comprises a rear casing (1), a rear air chamber disc (2), a chain wheel (3), a bearing (4), an air inlet tube (5), a seeding disc (6), a front air chamber disc (7), a front casing (8), a seed cleaning cutter (9), a seed box (10), a seed storage box (11), a seed discharge pressing plate (12) and a seed discharge cutter (13). As the seeding disc of the synchronous low-pressure peripheral air-aspiration type precise seeding device is fixedly connected with an air chamber, pressure loss and member abrasion caused by relative rotation can be reduced; the seeding device is used for feeding seeds by virtue of seed gravities and air pressure, the seed feeding property can be improved, and the air pressure requirements can be met; as the air inlet tube is of integral design, air can be directly fed into the air chamber, and air flow loss caused by connection can be avoided to the maximum extent.

Embodiments of the invention disclose a display panel and a preparation method thereof. The display panel comprises a substrate and a thin film transistor arranged on the substrate, wherein the thin film transistor comprises a grid electrode, a source electrode and a drain electrode. The display panel further comprises a first flat layer arranged between the grid electrode and the source electrode, wherein the first flat layer is an organic insulating layer. According to the display panel, the first flat layer is arranged between the grid electrode and the source and drain electrodes of the thin film transistor, the first flat layer is made of an organic insulating material and has large thickness and good filling and leveling performance, and the flatness of the surface of the display panel can be improved under the condition that a manufacturing process and a panel structure do not need to be additionally increased.

The invention relates to an air suction and mechanical auxiliary planting combined type corn precision seed-metering device and a seed metering method thereof. The air suction and mechanical auxiliary planting combined type corn precision seed-metering device is characterized by comprising a round bottom casing provided with an air suction port and an air pipe, an inner cavity of the bottom casing is provided with a sealing gasket with an arc-shaped groove, and the air suction port is located in the arc-shaped groove. One side of a seed metering plate is rotatably attached to a side wall of the arc-shaped groove, the other side of the seed metering plate is provided with a seed supporting plate, the seed metering plate is a disk with the circumference provided with a plurality of round suction holes, the seed supporting plate is an annular plate with the circumference provided with a plurality of indent clamping openings, and each round suction hole corresponds to each indent clamping opening in a one-to-one mode. The seed metering plate is driven by a transmission mechanism to rotate relative to the bottom casing, and an upper cover is arranged on the outer side of the seed metering plate and fixed on the bottom casing. A cavity arranged between the upper cover and the seed metering plate is divided into a seed filling area, a seed clearing area and a seed metering area, a seed clearing knife is arranged in the seed clearing area, and a seed discharging knife and a seed guiding plate are arranged in the seed metering area. The air suction and mechanical auxiliary planting combined type corn precision seed-metering device is simple in structure, can effectively solve the problems that an air suction type seed-metering device is high in seeding absence rate and the seeding absence at the edge of a field is severe, and can be widely applied to a corn precision seeding process.

The invention discloses a tear-resistant high-wear-resistance chloroprene rubber material which is prepared from the following raw materials in parts by weight: 40-60 parts of chloroprene rubber, 10-20 parts of epichlorohydrin rubber, 15-25 parts of nitrile-butadiene rubber, 4-8 parts of liquid epoxy resin, 4-10 parts of tetrafluoroethylene, 6-12 parts of polyurethane, 4-10 parts of pumice powder, 6-18 parts of glass microballoon, 10-20 parts of hydrated calcium silicate, 10-20 parts of meerschaum powder, 15-25 parts of tea saponin composite aupoz fiber, 0.5-1.3 parts of ethylene glycol dimethacrylate, 1.5-2.5 parts of dicumyl peroxide, 1.5-2.5 parts of triallyl isocyanurate, 1-2 parts of octyl phthalate and 2-4 parts of trimethyl phosphate. The tear-resistant high-wear-resistance chloroprene rubber material has the advantages of tear resistance, excellent wear resistance, favorable elasticity, excellent cushioning performance and excellent anticollision capacity.

The invention discloses a positive-negative pressure air suction type roller precision seed-metering device. The seeder is simple in structure, easy to operate and high in seeding efficiency. The device mainly comprises a roller air suction collecting and discharging module, an air conveying module, a transmission module, a vibration module and a rack module. The roller air suction collecting and discharging module is mainly composed of a roller, a shell, a brush, a hollow shaft, a positive pressure area and a negative pressure area. The device is characterized in that mechanical force drives a roller to rotate through a driven chain wheel; the fan is connected with a hollow shaft fixed on the rack through an air supply pipe to form a negative pressure area in the roller; during seed filling, a vibration block and a spring which are arranged on the seed box work so as to improve the seed filling performance of the seeds, during seed carrying, the seeds rotate along with the roller by virtue of friction force of rotation of the roller and suction force provided by a negative pressure area, and when the seeds rotate to the brush, redundant seeds are not damaged and removed so as to reduce the reseeding rate. A positive pressure area is arranged close to the position under the roller, the open holes are communicated with the atmospheric pressure, the positive pressure area is formed, meanwhile, seed metering is facilitated, when the roller rotates to the positive pressure area, negative pressure disappears, and seeds fall into a seed outlet below the roller by means of the gravity of the seeds, so that seed throwing is achieved.

The invention discloses an internal inflation suction type high-speed precision seed metering device, which comprises a front shell body, a rear shell body, a seed metering disc, a seed discharging wheel and a seed metering shaft, wherein a plurality of combined type holes formed by filling grooves and inoculation holes are uniformly distributed on the wall thickness of the seed metering disc along the circumferential direction; type hole replacement plates with the same contour as the groove bottoms of the filling grooves are arranged at the groove bottoms of the filling grooves; bosses are formed in the type hole replacement plates; suction holes penetrating through the bosses and the type hole replacement plates are formed in the boss; third through holes for mounting the bosses are formed in the groove bottoms of the filling grooves; and the suction holes are communicated with the filling grooves. The combination of the inner inflation type and the air suction type is adopted, andthus the seeds are not only subjected to the suction force of a single air flow, but also subjected to the action of gravity and centrifugal force of the seeds, so that the inflation form is added, the reduction of the leakage and filling rate is favourable and the operation speed is improved.

The invention provides an air-suction type adjustable-pitch helical bevel gear seed sowing device, and belongs to the technical field of seeding machines in agricultural machinery. The seed sowing device structurally comprises a shell, a left check ring, a left end cover, a seed sowing shaft, a belt, a seed guide device, a seed sowing wheel, a right check ring, a right end cover, an air suction pipe, a screw, a screw drive part, a motor, a seed protecting plate, springs and a seed sowing wheel partition. The air-suction type adjustable-pitch helical bevel gear seed sowing device is simple in structure and adopts a clear working principle, the seed sowing device adopts a symmetric helical bevel gear structure, and therefore, the phenomenon of seed sowing pulsation can be reduced; meanwhile,with adoption of the air-suction structure, seed filling performance is improved, and by means of a screw pitch adjusting mechanism, opening of a helical bevel gear groove can be adjusted, and control for seed sowing amount is realized; and the seed guide device is arranged, so that uniform and accurate plant spacing after seed charging is ensured, and qualification rate of seed plant spacing isgreatly increased.

The invention provides an air-suction type spiral grooved wheel seed sowing device, and belongs to the technical field of agricultural machinery sowing machinery. The air-suction type spiral grooved wheel seed sowing device structurally consists of a shell, a blocking sleeve, a blocking sleeve end cover, a seed sowing shaft, a seed sowing wheel, an adjusting sleeve, an air suction pipeline, a seedsowing wheel end cover, an electromagnetic vibrator, an adjusting handle, a seed protecting plate, an air suction chamber, a zero pressure area, a seed guiding device and a baffle plate. The air-suction type spiral grooved wheel seed sowing device is simple in structure and clear in working principle, and is simple and easy to implement; by a spiral groove structure of the seed sowing wheel, thephenomenon of seed sowing pulsation can be reduced; meanwhile, by an air suction structure, the seed filling performance is improved; by the electromagnetic vibrator, the seed sowing uniformity of theseed sowing device is improved effectively; by the adjusting sleeve, the size of an opening of a spiral groove can be adjusted, and the seed sowing quantity is controlled; and by the seed guiding device, the plant spacing is uniform and accurate after seeds are fed, the plant spacing yield of the seeds is greatly increased, and the market prospect is wide.

The invention provides a manufacturing method for a high-power-density LED carrier board. The method is characterized by comprising the following steps: a cutting step, a hole drilling step, a PTH step, an electroplating step, a solder mask hole plugging step, a grinding step, a outer layer circuit processing step, a welding resisting step, a surface treatment step, and a post process step; a holeprocessed via a drilling technology is less than or equal to 1000 u' in thickness, a hole position is + / - 30 um in accuracy, and CPK is greater than or equal to 1.33. According to the method, by controlling a processing flow and parameters of BT material LED lamp bead packaging substrate and adopting BT resin instead of FR-4, a metal substrate or a ceramic substrate, the method disclosed in the invention can meet requirements for middle and high quality LED carrier boards while a thermal conductivity coefficient is as high as 0.8 W / mK.