140results about How to "Improve the pulling effect" patented technology

A motorized wheel assembly adaptable to skateboards provides drive motor and power sources and controls for the directed control of forward or backward propulsion of the skateboard using throttle and braking controls, the motorized wheel, and all skateboard wheels. Weight transfer assemblies for the motorized wheel transfer a portion of a skateboard rider's weight through the front mounted motorized wheel to the ground surface creating sufficient traction for the motorized wheel to propel the skateboard. One weight transfer assembly embodiment provides a pivoting, compression based mounting bracket. Separate embodiments of the weight transfer assemblies include single or dual shock absorbers.

The invention relates to the field of face mask production equipment, in particular to a face mask body making machine. The face mask body making machine comprises a feeding mechanism, a frame, a printing mechanism, a fixed nose bridge strip mechanism, a pattern mechanism, a cutting mechanism, a waste material collecting mechanism and a discharging mechanism, wherein the feeding mechanism is used for feeding non-woven fabrics and nose bridge strips; the printing mechanism is used for printing on the non-woven fabrics; the fixed nose bridge strip mechanism is used for welding the nose bridge strips on the non-woven fabrics; the pattern mechanism is used for molding patterns on the non-woven fabrics; the cutting mechanism is used for cutting corners of the non-woven fabrics on which the patterns are molded; the waste material collecting mechanism is used for recovering waste scraps; the discharging mechanism is used for discharging finished face masks; the printing mechanism, the fixed nose bridge strip mechanism, the pattern mechanism, the cutting mechanism, the waste collecting mechanism and the discharging mechanism are all arranged above the frame, and are all positioned behind the feeding mechanism. The face mask body making machine has high production efficiency, and has contribution to improvement of the face mask quality.

The invention discloses a fiber bragg grating hydrogen sensor based on femtosecond laser micromachining and a preparation method for the fiber bragg grating hydrogen sensor. The method comprises the following steps of: preparing a straight slot array or an intersected helical slot three-dimensional micro structure on a fiber bragg grating wrapping layer through femtosecond laser, and plating a palladium alloy film, wherein the sensitivity of the sensor is greatly improved, and the service life of a thin film is prolonged. The fiber bragg grating hydrogen sensor is characterized in that a femtosecond laser micromachining technology is introduced; by a clamp, irregular micro pits are obtained by quickly scanning the wrapping layer; and the three-dimensional micro structure is prepared inside the grating wrapping layer. After the fiber bragg grating with the micro structure is plated with the film, a hydrogen absorption surface area is enlarged, and the axial direction of an optical fiber is softened; the grating wavelength drift is greatly improved by hydrogen absorption expanding strain; and therefore, the measuring precision is improved, and the measuring range is expanded. By the grating wrapping layer plated film with the surface micro pits and the bent three-dimensional micro structure, the adhesive force of the thin film can be greatly improved, and the service life of the thin film is prolonged. The sensor has the advantages of high sensitivity, wide measuring range, long service life and the like, and is suitable for remote monitoring.

The invention relates to a steel box girder bridge deck pavement layer with high stability and high vibration resistance. The steel box girder bridge deck pavement layer comprises a steel plate (1), wherein a waterproof bonding layer (2), a modified epoxy resin structure glue layer (3), a polyester filament and geotechnical cloth combined layer (4), a first high-viscosity modified asphalt tack coat (5), a first high-viscosity modified polyester fiber mixed stone mastic asphalt mixture layer (6), a second high-viscosity modified asphalt tack coat (7) and a second high-viscosity modified polyester fiber mixed stone mastic asphalt mixture layer (8) are arranged on the upper surface of the steel plate (1) from bottom to top. The steel box girder bridge deck pavement layer has the advantages of improving the bonding strength of an asphalt concrete pavement layer and a bridge deck slab, and improving the combining performance of the asphalt concrete pavement layer and the bridge deck slab due to high strength, good elasticity and high toughness of a geotechnical cloth; the geotechnical cloth has good traction action on the whole bridge deck slab, and finally, the purposes that the bridge deck pavement layer is prevented from shearing fracture, the asphalt pavement is prevented from translation, upheaval and other diseases in a travelling process, and the stability and vibration resistance of the bridge deck slab are effectively improved are achieved.

The invention relates to a planting method of winter jujube. The planting method solves the technical problem that winter jujube fruit trees are damaged by cold current, and winter jujube fruits are damaged by rainwater. The planting method comprises the following steps of: selection of a land for tree nursery and soil preparation: during planting, controlling the strain interval to be 2*4 or 4*4; pruning and trimming jujube trees: when the jujube trees are planted at the fourth year, controlling the tree height to be within 2.5m and controlling the diameter of crown of each integral jujube tree to be 180-210cm; inserting rods on both sides of the jujube trees along the length of the land, wherein the rods are at least higher than the jujube trees; covering shed plastic films at the tops of the rods from the middle and last ten-days of November every year to the first ten-day of April next year to prevent damage of winter cold current to the jujube trees; further covering shed plastic films at the tops of the rods from the period when the fruits of the jujubes trees are to be mature to the picking period to prevent the fruits from being cracked due to rainwater; and not covering the shed plastic films at the tops of the rods in other growing periods of the jujube trees, and normally managing the jujube trees to ensure normal growth of the jujube trees.

A system and method provides for repair / reconstruction of bridge and culvert constructions. Geosynthetically confined soils are used in combination with soil nails. The soil nails provide additional tensile strength below the areas reinforced with the geosynthetically confined soils. The soil nails may include both horizontal and vertical soil nails. Various forms of vertical tensioning support can be provided to include soil nails, micro-piles, sheet piling, and the like. The confined soils are installed at locations under and adjacent to the man made constructions, and can be provided in both symmetrical and asymmetrical configurations. For bridge constructions, the confined soils may be installed at a desired depth under the bridge girders, and under other primary support members of the bridge. Horizontal nails may be installed under and adjacent to the confined soils. According to the method, incremental excavation can take place so that the manmade construction being repaired may remain partially open to accommodate public travel or other intended uses, thereby limiting the impact of the repair / reconstruction effort.

The invention provides a formwork fastening device. The formwork fastening device comprises a first formwork, a second formwork arranged on one side of the first formwork in a parallel and spaced mode, a first back edge perpendicularly fixed to the outer side of the first formwork, and a second back edge perpendicularly fixed to the outer side of the second formwork. First through holes are formed in the first formwork, and second through holes are formed in the second formwork. The formwork fastening device further comprises a through-wall taper pin, a fastening bolt and an eccentric cam mechanism. Compared with the prior art, the formwork fastening device has the advantages of being low in cost, high in wall quality and good in environment protection performance.

The invention provides a box-type substation, and belongs to the technical field of substation equipment. The box-type substation comprises a box body, the box body comprises a transformer room with an access door and a transformer installed in the transformer room, the lower edge of the access door is hinged to the box body so as to fold the access door outward when the transformer is overhauled,so that the access door forms an overhaul platform that supports and cooperates with the transformer after the transformer is horizontally removed from the transformer room when the transformer is overhauled, and a pulling structure connected with the box body for pulling the overhaul platform or a supporting structure for supporting the overhaul platform is configured on the access door. When the transformer is overhauled, the access door is overturned outward and is opened, so that the access door is horizontally arranged and forms the overhaul platform, the transformer can be overhauled just by placing the transformer on the overhaul platform, after the transformer is overhauled, the transformer is pushed back into the transformer room and the access door is closed, then the overhaul of the transformer is completed, and the problem of low overhaul efficiency of the transformer in the box-type substation is solved.

The invention provides a filter screen for industrial circulating water. The filter screen comprises an annular baffle, a framework, protective cloth, a magnet strip, a support plate, sliding bars, afilter net I, a filter net II, opening grooves and connecting rods, wherein the framework is fixed at the lower end of the annular baffle, the opening grooves are machined in the left, right, front and rear sides in the annular baffle, the connecting rods are arranged at the front parts in the opening grooves, the protective cloth is connected to the front ends of the connecting rods, the magnet strip is assembled at the lower end of the protective cloth, the support plate is mounted at the lower end of the magnet strip and fixed below the front side of the framework, the filter net I and thefilter net II are arranged in the framework, and the sliding bars are assembled on the left and right sides of the filter net I and the filter net II. By means of the design, the double-layer filtering function is realized. The filter screen is convenient to use and operate, realizes the double-layer filtering function and is convenient to dismount, replace and clear.

The present invention relates to a driving mechanism for autoamtic curtain machine. It is formed from driving wheel, driven wheel, circular belt driving component, circular belt manual component, clutch, driving motor, driving shaft, general curtain track and connecting component of circular belt driving component and curtain roller hook. The exterior of two ends of general curtain track is equipped with a driving wheel, and another is driven wheel, the circular belt driving component is cover-mounted on two driving wheels, and the circular belt manual component is placed on one driving wheel, and the clutch can be used to implement connection and separation of driving wheel and driving shaft.

The invention relates to the jujube tree planting technical field, in particular to a jujube tree planting method and a jujube tree planting system. The jujube tree planting system comprises a greenhouse body, wherein a temperature sensor, a humidity sensor and a spraying system are arranged in the greenhouse body, a horizontal suspended ceiling layer is installed at the top of a side brace above the greenhouse body, an air vent window is formed in a side wall among ceiling braces at the left end and the right end of the greenhouse body and the horizontal suspended ceiling layer, a curtain device is installed on the air vent window, the curtain device is composed of a roller curtain fixing rod, a reel and a side plastic greenhouse film, the roller curtain fixing rod is installed at the upper end of the air vent window, the side plastic greenhouse film is rolled on the reel, and the upper end of the side plastic greenhouse film is fixed on the roller curtain fixing rod. The jujube tree planting system is simple in structure, high in winter jujube yield, and free of insect pest, controls the height of jujube trees within 2.5cm by pruning the winter jujube trees, facilitates picking for fruit farmers when winter jujube is ripe, and saves manpower.

The present invention relates to a liver opening device used in a laparoscopic gastric operation. The present invention is characterized in that the liver open device includes an elastic lining ring (1), a soft sleeve (2) and an elastic tongue ring (4). The circumstance of the elastic lining ring (1) is respectively connected with the soft sleeve (2) and the elastic tongue ring (4). The other end of the soft sleeve (2) is under the open status. The liver opening device used for the laparoscopic gastric operation provided by the present invention has the advantages of simple and reasonable structure, convenient use and low cost. The device can rapidly seal the incision, reconstruct the pneumoperitoneum, fully open the lever under the pneumoperitoneum status and effectively expose small bend visual fields. A large outer-arranged surgical instrument can be arranged through the device and the internal and external linkages in the peritoneal under the pneumoperitoneum status can be done to finish the gastric operation.

A universal spherical joint supporter with an anti-loosening position-limiting structure comprises a main spherical joint structural part consisting of a main top base with a concave spherical surface and a main bottom base with a convex spherical surface; the main bottom base consists of a base body, at least three reinforced plates and a steel ball; the steel ball is a convex ball component arranged in the bottom base; the reinforced plates are distributed in the bottom base radially and vertically by taking the vertical middle axis line of the steel ball as a central line; each reinforced plate is provided with a vertical edge closely to the middle axial line of the steel ball; a spherical concave position used for bearing the steel ball is arranged on an upper plate of the reinforced plate closely to the middle axis line by taking the spherical center of the steel ball as a center, and a convex claw is arranged in a space between every two adjacent reinforced plates on the main bottom base correspondingly to the lower circumference of the main top base, thus forming the position-limiting structure of the spherical joint. The position-limiting structure can play roles of preventing loosening, restricting the rotation of the top base around the axis line and bearing the pulling force and has excellent bearing performance; and when the position-limiting structure bears the pulling force, the spherical joint part can rotate slightly and simultaneously.

The invention relates to a pipe column for a prestress anti-floating tensile reinforcing steel bar combined anchor rope. The pipe column comprises a concrete prefabricated pipe column body provided with a framework of steel reinforcement, and the pipe column can accommodate the reinforcing steel bar of the anchor rod. The inner diameter of the pipe column is 3-7 cm and the outer diameter of the pipe column is 14-30 cm. The framework of steel reinforcement is arranged in the concrete prefabricated pipe column. The combined anchor rope is a pre-tensioning prestress anti-floating tensile reinforcing steel bar anchor rope. The pipe column is a pipe column shaped jacket of the reinforcing steel bar of the anchor rod. The reinforcing steel bar of the anchor rod penetrates the pipe column, carrying plates which are provided with holes in the center and are greater than the inner diameter of the pipe column are placed at two ends of a product pipe column, and the reinforcing steel bar ends arefixed to the carrying plates or are welded and fixed to the carrying plates when stress is applied to the anchor rod exposed on the surfaces of the carrying plates. The reinforcing steel bar is a single finish rolled anchor rod reinforcing steel bar or comprises a plurality of finish rolled anchor rod reinforcing steel bars. When the finish rolled anchor rod reinforcing steel bars are used, the carrying plates need a prestress applying device provided with multiple holes and reinforcing steel bars.

The invention relates to special paper for the surface of a fan blade and a preparation method for the special paper. The special paper is prepared from the following components in parts by weight: 10-30 parts of bleached softwood kraft pulp, 30-60 parts of bleached hardwood kraft pulp, 15-25 parts of filler, 5-12 parts of a pigment, 1.0-2.0 parts of a wet strength agent, 1.5-2.0 parts of a dry strength agent, 10-15 parts of a high-temperature-resistant flame retardant and 3-5 parts of a reinforcing agent. According to the special paper for the surface of the fan blade provided by the invention, the appearance of the fan blade of original material is more attractive and decent, thereby showing an incomparable visual effect. Compared with a wooden fan blade, the fan blade is improved in rigidity, and the wind effect is more stable and smooth, thereby greatly reducing the noise, and meanwhile, the fan is more high-grade and attractive. The special paper for the surface of the fan blade has very high mechanical strength, can be applied to fan blade equipment of turbines, fans, propellers and rotor wings of large machinery, has the characteristics of being good in wear resistance, corrosion resistance and high-temperature resistance, and has a good protective effect on the equipment.

The invention discloses a power cable wire passing device, comprising a rack; a wire rolling shaft is installed behind the rack; the wire rolling shaft is provided with a wire roller; the rack is connected to two lower part driving shafts which are arranged in parallel; one of the lower part driving shafts is driven by a power device; the lower part driving shaft is provided with a lower part driving roller; two upper part driving rollers which are arranged in parallel and are corresponding to the lower part driving shafts are rotatably connected to the rack; the upper part driving shafts are provided with upper part driving rollers; opposite grooves are arranged on the corresponding upper part driving rollers and the lower part driving rollers; the groove is provided with antiskid patterns; and grooves between the upper part driving roller and the lower part driving roller form a through hole for the power cable to pass through. The power cable wire passing device is good in drawing effect and high in efficiency of laying the cable.

The invention provides an electric welding rod suitable for welding various steel types and application and preparation method of the electric welding rod suitable for welding various steel types andrelates to the electric welding rod suitable for welding various steel types. The electric welding rod comprises a welding core and a coating. The coating is applied to the outer wall of the welding core, and the coating accounts for 40-45% of the total weight of the welding rod. The invention further relates to a preparation method of the electric welding rod suitable for welding various steel types. The preparation method comprises the steps of preparation of the welding core and the coating, forming and drying. The electric welding rod is used for welding of low carbon steel, medium carbonsteel, high carbon steel, chromium molybdenum steel, heat resistant steel, spring steel, manganese steel, carbon tool steel, hot-work alloy steel, cast steel, low alloy steel, high alloy steel, austenitic stainless steel, martensitic stainless steel, ferritic stainless steel, high-speed tool steel and dissimilar steel. The electric welding rod and the application and preparation method have the beneficial effects that the application is wide, the cost is low and the welding effect is good.

The invention relates to an automatic frictioning machine for a panel. The automatic frictioning machine comprises a rack and a power distribution control cabinet, wherein a material carrying mechanism matched with the panel is arranged on the rack; a vertical mounting plate is arranged on the rack; an operation display matched with the power distribution control cabinet and a frictioning mechanism matched with the material carrying mechanism are arranged on the mounting plate; the frictioning mechanism comprises an unwinding drum, a winding drum and a frictioning drum matched with the unwinding drum and the winding drum; the unwinding drum, the winding drum and the frictioning drum are arranged on the mounting plate; the frictioning drum is matched with the material carrying mechanism; the winding drum is connected with a winding motor through a synchronizing wheel; and the winding motor and the material carrying mechanism are connected to the power distribution control cabinet. According to the automatic frictioning machine for the panel provided by the invention, the unwinding drum and the winding drum of a frictioning strip are arranged, the frictioning drum matched with the unwinding drum and the winding drum is arranged, a panel carrier is arranged below the frictioning drum, the frictioning strip and the panel are in contact through the frictioning drum, the frictioning effect is achieved, the frictioning efficiency is high, the frictioning strip continuously moves, the frictioning effect is not affected by too large viscose glue, and good frictioning precision can be guaranteed.

The invention discloses a space-time monitoring device for dam seepage behaviors and a monitoring method. The space-time monitoring device comprises a vertical force bearing and fiber loading column, an outer edge through pipe and a sensing optical fiber, wherein a left force bearing cross beam and a right force bearing cross beam are arranged on two sides of the vertical force bearing and fiber loading column respectively; the vertical force bearing and fiber loading column is sleeved with the outer edge through pipe; a fiber collection box is arranged above a second transition round end; the sensing optical fiber in the fiber collection box penetrates the outer edge through pipe, is connected with an element bearing body comprising a temperature measuring device, is then arranged in the vertical force bearing and fiber loading column in an S form, bypasses the second transition round end and a first transition round end sequentially, penetrates an elastic device and leads out from a third transition round end. The space-time monitoring device used for the dam seepage behaviors and provided with the embedded bi-directional double-S-shaped sensing fiber is constructed in a fusion manner, a dam seepage behavior monitoring technology develops in the trend of intelligentization, digitization, integration and miniaturization, and horizontal and vertical quantitative and qualitative evaluation in time and space can be realized.

The invention discloses a double-axis solar tracker system device for a solar power station and relates to the field of photovoltaic power generation, in particular to a tracking system mechanism of a photovoltaic power station. The double-axis solar tracker system device comprises a stand column, a first elevation push rod, a second elevation push rod and a solar panel, wherein a hinging base is fixedly connected to the top end of the stand column, a frame set is arranged below the solar panel, a beam tube is hinged to the lower side of the frame set, a hinging support is fixedly connected with the midpoint of the beam tube, and the beam tube is hinged to the hinging base through the hinging support and a pin shaft; a first push rod support is arranged on a stand rod, a second push rod support is arranged on the portion, on one side of the hinging support, of the beam tube, the first elevation push rod is arranged between the first push rod support and the second push rod support, a third push rod support is arranged on the portion, on the other side of the hinging support, of the beam tube, a fourth push rod support is arranged on a keel frame of the frame set below the solar panel and located on one side of the beam tube, and the second elevation push rod is arranged between the third push rod support and the fourth push rod support. According to the solar tracker system device, tracking direction is accurate, and therefore the power generating efficiency of a module is improved.

This is an electric heater for production resume of heavy oil well after long terms of inactivity. The heating unit to the heater shell is composed by six spiral resistance wires in series connection and posited against the shell wall parallel to the shell axis. The wires are put in conductor pipes which are separated by MgO powder. The wires are evenly distributed along the shell wall. The bottom of the inner shall is covered by a layer of alloy alumina. The wire connection parts are covered by a seal of epoxide resin. There is a layer of epoxide resin on the shell top section. The other parts of the shell are filled with MgO powder.

The invention relates to the field of insoles, and particularly discloses an insole with good elasticity and a manufacturing process. The insole is prepared from polytetrahydrofuran glycol, polyether modified diphenylmethane diisocyanate, a catalyst, a chain extender, water and other raw materials. The preparation process comprises the following steps: uniformly stirring the polytetrahydrofuran glycol, the catalyst, the chain extender and the water to obtain a standby material; adding polyether modified diphenylmethane diisocyanate into the standby material, and stirring to obtain an intermediate material; and injecting the intermediate material into a mold for molding, and then cutting to obtain the insole. The insole prepared by the invention has relatively good elastic property and tensile property, and is comfortable to wear and long in service life.

The invention belongs to the field of chemical engineering synthesis, and concretely discloses an ultrathin toughened glass. The glass mainly comprises, by weight, 80-85% of SiO2, 4-6% of Al2O3, 15-22% of CaO, 3-5% of MgO and 19-20% of Na2O, and also comprises 0.003-0.010% of Fe2O3, 15% or more of K2O + Na2O, 0.5-0.7% of Sb2O3 and 1-2% of ZrO, wherein the content of Na2O is greater than the content of K2O. Above components undergo transverse conclusion connection under the guiding of B2O3 and ZnO to realize float process flow molding. The whole ultrathin glass has high drawing ability and enough toughness, can resist large impact and shock, and is convenient to move and use.

The invention discloses a cervical vertebra therapeutic apparatus. The cervical vertebra therapeutic apparatus comprises a locating device used for fixing the cervical vertebra and a pushing and lifting device used for pushing and lifting the cervical vertebra upward to correct the natural physiological curvature of the cervical vertebra and make the cervical vertebra keep the natural physiological curvature and a traction device used for pulling the cervical vertebra which keeps the natural physiological curvature. The cervical vertebra therapeutic apparatus can effectively combine two modesof pushing and lifting and traction and effectively conduct traction under the circumstance that the cervical vertebra keeps the natural physiological curvature, the pushing and lifting and the traction form acting force in different directions and double coordinate systems and supplement each other, and no one can be removed. The two kinds of acting force makes the spine keep the natural physiological curvature and stretch the whole spine, the gaps between the centrum and the intervertebral disc are expanded, the nucleus pulposus is promoted to retract naturally, and the treatment purpose iseffectively achieved.

The invention discloses an egg collection device of a livestock farm. The device comprises a rectangular base, a first bearing groove is formed in the center of the upper surface of the rectangular base, a strip-shaped bearing basket is arranged in the first bearing groove, a lifting mechanism is arranged on the edge of the upper surface of the strip-shaped bearing basket, a moving mechanism is arranged on the lower surface of the rectangular base, a fixing mechanism is disposed between the rectangular base and the side surface of the strip-shaped bearing basket, and a stretching egg pick-up mechanism is disposed on the upper surface of the rectangular base and located on the outer side of the strip-shaped bearing basket. The egg collection device has the advantages that operation is convenient, human hands are protected against pecking when people pick up eggs, hands of staff are also protected against scratching, the pulling effect is good, the bearing effect is good, and an egg basket is convenient to move.

The invention relates to cotton textile production equipment, in particular to an opening device for cotton textile production. The opening device comprises a cotton fiber loosening treatment assembly, wherein the cotton fiber loosening treatment assembly comprises a box body and a loosening cylinder which is arranged in the box body and is connected with a lifting mechanism; the loosening cylinder comprises a group of end plates which are oppositely arranged and connecting rods which are fixedly connected with the end plates; and elastic threads which are circumferentially distributed and used for poking cotton are connected between the end plates. By arranging the loosening cylinder comprising the end plates, the connecting rods and the elastic threads, the lifting mechanism comprising a lifting frame and an eccentric disc, as well as a rolling gear, a rotating shaft, a poking rod and a fixed shaft, the loosening cylinder rotates up and down, the elastic threads vibrate at high frequency under the action of the poking rod, cotton limiting of cotton balls is poked at high frequency, and the cotton limiting is straightened out; the cotton balls are scattered; and through a revolving drum which revolves and rotates and a toothed bar arranged on the revolving drum, the cotton fibers are further stretched, and the loosening effect is improved.

The invention discloses a brake pulling device used for a cart. The brake pulling device used for the cart comprises a pressing part arranged on a push rod (1) of the cart; a digging rope (2) is arranged in the pressing part; the pressing part comprises a pressing block (3) and an eccentric wheel (4); the eccentric wheel (4) can be eccentrically and rotatably arranged in the inner chamber of a push rod (1) through an eccentric shaft (41); both ends of the eccentric shaft (41) are respectively fixed to side faces which correspond to both sides of the push rod (1); the pressing block (3) is located in the inner chamber of the push rod (1); a strip-shaped chamber (31) is vertically formed in the pressing block (3); a concave chamber (32) is formed in the lower part of the pressing block (3); the eccentric wheel (4) extends into the concave chamber (32), and is movably connected with the pressing block (3); the eccentric shaft (41) of the eccentric wheel (4) is located at the position of the strip-shaped chamber (31) of the pressing block (3); the digging rope (2) is wound on the bottom face of the eccentric wheel (4) and passes through a fastener hole (43) of the eccentric wheel (4) so as to be fixed to the end face of the fastener hole (43), and the pressing block (3) is provided with a locking mechanism. The brake pulling device used for the cart, disclosed by the invention, has the advantages that the operation is labor-saving and convenient, the structure is firm and compact, and the service life is long.

The invention provides solar cell conductive silver paste free of silicone oil and application thereof. Raw materials of the conductive silver paste comprise silver powder, glass powder, an organic carrier and a polymer additive, and the polymer additive comprises a dendritic polymer and a polar solvent. The invention further provides a solar cell which comprises the solar cell conductive silver paste free of silicone oil. According to the conductive silver paste provided by the invention, silicone oil does not need to be added, and the problems that the silicone oil cannot be completely volatilized in the sintering process, silicon residues exist, the series resistance of a battery piece is increased, and sintering is poor in the front conductive silver paste containing the silicone oil are solved.

The invention discloses a prestressed unbonded anchor rod reinforcing steel bar. The prestressed unbonded anchor rod reinforcing steel bar comprises a main reinforcing steel bar serving as a basic bearing structure, the main reinforcing steel bar is a finish rolling unbonded reinforcing steel bar, an anti-corrosion grease layer is arranged on the surface of the main reinforcing steel bar, and a plastic film sleeve is arranged outside the anti-corrosion grease layer. A prepared pre-stressed anchor rod is characterized in that a connecting structure at the lower end of an anti-floating tensile anchor rod of a concrete prefabricated pipe column is grouting body or concrete with an expanded head, and the grouting body or concrete with the expanded head is internally wrapped with a steel reinforcement framework or a bag; the steel reinforcement framework comprises one or more reinforcing steel bars, a steel reinforcement cage with a common structure and a variable-diameter steel reinforcement cage, when the steel reinforcement cage with the common structure and a variable-diameter steel reinforcement cage are adopted, the lower ends of anti-floating tensile anchor rod steel bars of a concrete prefabricated pipe column are connected with main reinforcements of the steel reinforcement cage or the variable-diameter steel reinforcement cage, and one or more steel bar anchor rod steel bars are used for being connected with one or more steel bars; and one or more reinforcing steel bars or reinforcement cages are still arranged in the center of the bag.