71results about How to "Little effect of gravity" patented technology

This invention discloses a blood vessel forming device and method for 3D bioprinting. The device and method are used for the bioengineering technology and aim to solve the problems that currently, when blood vessels are printed through the 3D bioprinting technologies, the blood vessels are poor in forming quality and small in forming length. According to the method, biological ink is printed on rotary rods with the surfaces coated with thermo-sensitive hydrogel through the 3D bioprinting technologies, and the needed biological blood vessels can be formed through further biological culture. According to the method, the rotary rods with different diameters and lengths can be prepared for printing the biological blood vessels with different sizes, blood vessel tissue which is uniform in thickness and accurate in printing size can be fast printed, the available 3D printing technologies are diverse, and the device and method are wide in practicability. We call the method a 3D rotational forming printing method (3Denvelop Bioprinting Method).

The invention provides a multi-blade collimator initialization method, wherein the multi-blade collimator comprises a box body and blades arranged in the box body in parallel. The multi-blade collimator initialization method comprises the steps of using a correction switch is for correcting the conversion relation between the blade position and a corresponding main encoder value and an auxiliary encoder value, sequentially moving the blades to a position triggering the correction switch, recording a corresponding main encoder value and an auxiliary encoder value at the trigger moment, correcting the conversion relation between the blade position and the corresponding main encoder value according to the position of the blades at the triggering moment and the corresponding main encoder value, and correcting the conversion relation between the position of the blades and the corresponding auxiliary encoder value according to the position of the blades at the triggering moment and the corresponding auxiliary encoder value. The blade position determined by the multi-blade collimator initialization method is more accurate. The invention further provides a radiotherapy system and a computer readable storage medium.

The invention discloses an internal fuel main pipe for double-way fuel conveying and atomization. The internal fuel main pipe consists of a main pipe (1) and a nozzle (2); the fuel main pipe is fixedthrough a support column (3) with a ball; a main-way fuel supply pipe (5) and a secondary-way fuel supply pipe (6) are connected through a nozzle shell (4); the heat protection of the pipe is realizedthrough a cover (7) and a thermal insulation layer (8); through a bushing (9) with a thread fuel filter and a thread surface on the surface of a secondary fuel filter (10), the filtration and the stable flowing of fuel are realized; the centrifugal atomization of the fuel is realized through cyclone grooves on a cyclone (11) and a nozzle cyclone (12); and accumulated carbons on the nozzle are reduced through inclined intake holes on a gas cover (13). The fuel main pipe can meet the demands of different fuel supply characteristics of double fuel ways, has the advantages of good atomization effect, compact structure, low mass, low influence on the fuel gravity, difficult accumulation of carbons on the end surface of the nozzle and difficult influence from instable fuel flowing, and is suitable for an aero-engine and a gas turbine combustion chamber.

The invention belongs to the field of fire-fighting fire extinguishing apparatus and especially relates to a parallel composite tank for fire extinguishing of large-scale equipment. The parallel composite tank comprises at least two powder storage tanks, which are for storing, atomizing and mixing dry powder and are in a same horizontal line; an upper air inlet and a lower air inlet are arranged on the top and the bottom of each powder storage tank; a pressure sensor for detecting pressure in each tank is arranged on the top of each powder storage tank; an atomizing device for loosening and atomizing the dry powder is arranged in each powder storage tank; the lower air inlet is connected with the atomizing device; a powder outlet is arranged on a side wall of each powder storage tank; and powder outlets of the at least two powder storage tanks are connected with a dry powder pipeline centralized controller through a connecting pipe. According to the invention, a plurality of powder storage tanks are connected through the dry powder pipeline controller, so as to start different numbers of powder storage tanks, according to fire behavior, to guarantee the amount of dry powder needed by fire extinguishing.

The invention provides a rotating rod for 3D biological printing. The rotating rod is horizontally arranged and driven to rotate and is of a hollow structure, and at least one hole is formed in the surface of the rotating rod; in the 3D biological printing process, a nutrient solution passes through the hollow structure, and part of the nutrient solution penetrates out of the holes. The invention further provides a 3D biological printing platform which comprises the rotating rod and a nutrient supply system and can supply nutrients and a method for printing tubular tissue through the biological printing platform. Accordingly, the possibility that the tissue collapses due to the gravity influence is decreased, the novel method for achieving 3D biological printing of the tubular tissue and supplying the nutrients in the printing process is provided, and a wide application prospect is achieved.

The invention discloses a method for testing the warping degree of a wafer, and the method comprises the following steps: (1) vertically arranging a standard flat mirror, and enabling the standard flat mirror to be parallel to the direction of gravity; (2) loading a wafer; (3) adjusting the distance between the wafer and the standard flat mirror; (4) adjusting the wafer to be parallel to the standard flat mirror in a face-to-face manner; (5) starting a test module, enabling the test module to perform parallel movement scanning relative to the standard flat mirror, and respectively sampling thedistance from a probe of the sensor to the wafer and the distance from the probe of the sensor to the standard flat mirror through the sensor arranged on the test module; (6) performing data processing program processing on the obtained distance sampling value to obtain a warping degree parameter of the wafer. The method has the advantages that when the wafer is vertically placed for testing, therigidity in the wafer surface is high, the influence of gravity can be greatly reduced, deformation is reduced, and the testing method is convenient and simple.

The invention belongs to the technical field of a railway wagon and specifically relates to a hand braking device mounted on a chassis of a railway hopper wagon. The problems of the present hand braking device of the railway hopper wagon are solved. The hand braking device comprises a hand brake, a hand brake bracket, a fixed pulley, a chain assembly, a vertical lever assembly, a hand braking shifter lever fulcrum base, a hand braking shifter lever, a hand braking shifter lever supporting frame, a hand brake chain assembly, a hand brake pull rod guiding frame and a hand brake pull rod. The hand braking device is arranged on a floor of the chassis assembly of the hopper wagon; under the condition of no influence on the function of the hand braking device, the possibility of pulling out the supporting frame by a current hand brake pull rod reinforcing rid of the hopper wagon and the problem of influence on the traffic safety caused by the breaking of the hand brake pull rod are thoroughly eliminated; the demand on the traffic safety of the railway wagon is met.

The invention discloses an MIG (metal inert gas) welding system and relates to the technical field of workpiece welding. Through combination of a welding robot with equipment such as a welding machine and the like, a stitch welding technology can be performed on a workpiece, then the heat input ratio in a welding operation process can be reduced greatly, the heat accumulation is enabled to be lower, and the workpiece is not prone to burn-through; meanwhile, with adoption of spot welding, rapid solidification can be realized after welding, and then whole-position welding can be realized; further, due to high solidification speed of spot welding and smaller gravity effect, welding forming structures in difference positions are basically the same.

The invention provides an automotive body repairing spraying process and relates to the technical field of spraying processing. The automotive body repairing spraying process comprises the following steps that an area to be repaired is cleaned through detergent and then cleaned up through clear water, and then the surface of a part is cleaned through a finish paint diluent; the area to be repaired is polished to form a bevel opening, the upper portion of the bevel opening is high, and the lower portion of the bevel opening is low; putty powder is sprayed for leveling and is dried, then a tackifier is sprayed and dried, the thickness of the tackifier is made to be uniform through scraping by a rubber scraper, the polished area to be repaired is kept as a bevel all the time, and sanding and side finishing are carried out; the tackifier is sprayed to the polished area to be repaired again and is dried, then medium coating is sprayed for filling and leveling, the polished area to be repaired is kept as the bevel, and an original paint layer on an automotive body is polished completely; and paint and curing agents for the automotive body are diluted and mixed, are obliquely sprayed from the upper portion to the lower portion of the spraying bevel opening after being proportionally mixed, and then are dried. According to the automotive body repairing spraying process, the curing speed is high, the gravity effect is low, the flatness of the sprayed plane is high, and the repairing and restoring effects are good.

A coating liquid (3) is horizontally jetted from nozzles (2a, 2b) so that lens surfaces (1a, 1b) of a spectacle lens base material (1) arranged so that the optical axis (C) is oriented in the horizontal direction are coated with the coating liquid (3) (step (S2a)). The spectacle lens base material (1) is rotated at a first rotational speed with the optical axis (C) as the rotational center, thus using centrifugal force to coat and spread the coating liquid (3) over the lens surface (step (S2b)). The spectacle lens base material (1) is rotated at a second rotational speed higher than the first rotational speed, thus using centrifugal force to splash the excess (3a) of the coating liquid (3) outside the spectacle lens base material (1) (step (S3)). Thus, a highly uniform film can be formed over the lens surface of a spectacle lens.

The present invention belongs to the field of machining equipment, and is especially large vertical grinder. The large vertical grinder consists of a vertical work table, a driving and transmitting apparatus connected to the work table, a track pedestal opposite to the work table, transverse tracks on the track pedestal and a guide plate stage on the transverse tracks, longitudinal tracks on the guide plate stage and a longitudinal guide plate, a grinding tool and a polishing wheel on the longitudinal guide plate. The grinding tool and the polishing wheel may be controlled in the control desk to move transversely and longitudinally. The present invention can perform grinding and polishing in the same apparatus and has no peripheral drooping, less motion resistance and low power consumption.

The invention belongs to the technical field of air-conditioners, and particularly relates to a cyclone refrigerant branching device for a heat exchanger of an air-conditioner, which comprises a cylindrical body with one end face closed and the other end face provided with a plurality of branch outlet holes. An inner cavity of the body is an inner branching cavity and communicated with the branch outlet holes. The body side wall at the closed end of the body is provided with a tangential refrigerant inlet hole, and the center line of the tangential refrigerant inlet hole is perpendicular to the center line of the body but not intersected with the same, and close and parallel to the tangent line of the inner wall of the branching cavity to enable refrigerant in a liquid supply pipe inserted into the refrigerant inlet hole to tangentially flow in the branching cavity. The cyclone refrigerant branching device is effective in branching, less susceptible to gravity, flexible in mounting, simple in structure and economically and technically advantageous as processing difficulty is lowered.

The invention relates to the field of sand core assembling, in particular to a sand core assembling system and a sand core assembling method. The sand core assembling system comprises a plurality of robot clamps and a mold, wherein the robot clamps are used for arranging multiple sand cores on the mold in the horizontal direction; the robot clamps are further used for driving the clamped to-be-assembled sand cores to be folded with an original sand core on the mold; and/or the mold comprises a driving mechanism used for driving the clamped to-be-assembled sand cores to be folded with the original sand core on the mold. The sand core assembling method is applied to the sand core assembling system. According to the sand core assembling system and the sand core assembling method, the middle sand core with position deviation can be conveniently adjusted, the assembling efficiency can be improved, and the quality of a sand core assembly also can be improved.

The invention discloses a road crossing vehicle system. The road crossing vehicle system comprises a structure main body, a road crossing vehicle, a driving device and a rail system, wherein the roadcrossing vehicle, the driving device and the rail system are arranged in the structure main body; the structure main body comprises two vertical shafts and a road crossing bridge communicating with the tops of the two vertical shafts; lifting tables are arranged in the vertical shafts; the driving device comprises a driving source, a driving wheel and a guiding wheel, the driving source is arranged at the top of the road crossing vehicle, and the driving wheel and the guiding wheel stretch out of the two sides of the road crossing vehicle; the rail system comprises driving rails, guiding railsand load bearing rails; the driving rails and the guiding rails are both symmetrically arranged on the two sides of the interior of the structure main body and extend from one vertical shaft to the other vertical shaft through the road crossing bridge along the operating path of the road crossing vehicle, the driving wheel cooperates with the driving rails, and the guiding wheel cooperates with the guiding rails; and the load bearing rails are arranged on the road crossing bridge and the lifting tables, the top of the road crossing vehicle is provided with a wheel set, and the wheel set is matched with the load bearing rails. According to the road crossing vehicle system, it can be achieved that the road crossing vehicle operates continuously and stably by switching from vertical liftingto transverse moving and crosses the road through only one set of driving device.

The invention relates to a pavement material crack load transfer behavior loading test device and method. The device comprises two loading units which are symmetrically arranged, and a prefabricated crack is arranged between the two loading units; each loading unit comprises a bottom support plate, the bottom support plates of the two loading units are connected through a bolt, and a steel sheet is arranged between the bottom support plates; chloroprene rubber is arranged on the bottom support plate, a road material test piece, a small bonding control plate and a large stable loading plate aresequentially arranged on the chloroprene rubber, and stable control rods are arranged between the large stable loading plate and the bottom support plate and located at the four corners of the loading unit; a testing machine actuating head is arranged at the upper part of the large stable loading plate; displacement sensors are symmetrically adhered to the side surfaces of the road material testpiece on the two sides of the prefabricated crack. Under the action of a reciprocating load, dynamic load loading under the condition of mechanical attenuation is achieved under different crack widths, integrity and stability are achieved, and the complete and stable load transmission process can be achieved.

The invention relates to a box type polyurethane foam preparation method. Through the box type polyurethane foam preparation method, it can be ensured that foaming of foaming fluid is implemented at constant temperature, constant pressure and constant humidity all the time, the quality of a foamed material is ensured, and the foamed material with the flush upper surface and uniform density can be obtained.