43results about How to "Will not reverse" patented technology

The invention discloses an isolation type non-woven fabric textile winding machine which belongs to the technical field of textile winding. A cooling fan is arranged at the top of a fixed bracket; anupper flattening roller and a lower flattening roller are arranged at the top of a first bracket in sequence from top to bottom; a tensioning roller is arranged at the top of a third bracket; the tensioning roller is connected onto the third bracket through a second connecting shaft; a second through hole is formed in the top of a side wall of a second bracket; a second fixed block is arranged atthe top of the second through hole; a second rigid spring is arranged at the bottom of the second fixed block; a third connecting shaft is provided with a tracking roller; six groups of winding rollers with the same structure are arranged below the tracking roller; the winding rollers are connected with a connecting frame through a fourth connecting shaft; a ratchet wheel mechanism which is matched with a mounting groove is arranged at the left end of a fifth connecting shaft. The winding machine disclosed by the invention is reasonable in structural design and high in automation degree; simple and convenient textile winding work can be ensured and the winding effect of the fabric is remarkable.

The invention discloses a rotor positioning method, a rotor positioning device and a control system for a brushless direct current motor, wherein the positioning method comprises the following steps:when performing conduction control on the stator windings of the motor according to a preset conduction mode, applying a voltage detecting pulse of a first preset time to different phases of the stator windings of the motor in turn, and obtaining a plurality of current values by acquiring current values of the stator windings at each phase; acquiring a maximum current value among the plurality ofcurrent values, and marking the phase corresponding to the maximum current value as the first phase; acquiring the phase in which the current value is larger in the two phases adjacent to the first phase, and marking the same as the second phase; obtaining a sector in which the rotor of the motor is located according to according to the first phase and the second phase, and obtaining the positionof the rotor of the motor according to the sector in which the rotor is located. Therefore, the position of the rotor of the motor may be quickly and accurately obtained without the appearance of theproblem of abnormal noise as well as jitter and positioning errors. In addition, the method is simple, and the blind spotless positioning may be realized.

The invention relates to a tensioning winch transmission device of a belt conveyer, which mainly comprises a box body, a main transmission mechanism, an auxiliary transmission mechanism and an output transmission mechanism which is arranged at the front end of the box body and connected with the main transmission mechanism, wherein the main transmission mechanism and the auxiliary transmission mechanism are arranged in the box body in parallel. In the invention, a gear pair comprising a main clutch, an auxiliary clutch and five gears is adopted to achieve the purpose that an input shaft of a winch rotates along one direction all the time while reeling off and rolling up so as follow the tensile force change of a conveyer belt and meet the requirement on the change of the conveyer belt within a larger range; dynamic braking can be directly carried out through a motor to limit the maximum reeling off speed so as to prevent safe accidents; and soft start during rolling up can be realized, thus impact force born by a steel wire rope and relevant components is reduced, and the service life of the components is prolonged. The device can be used for precisely controlling the tensioning force and is suitable for controlling the tensioning winch of the belt conveyer, particularly for a narrow space under a coal mine. The device has the advantages of simple structure, convenient maintenance, low manufacturing cost, strong generality and high reliability.

The invention relates to a check valve for vehicle. The check valve apparatus has a valve housing and valve unit. The device has a valve housing with inlet and outlet openings, and sealed edge. The valve unit is movably supported in the housing. A flow cross section (A1) is formed between the outlet opening and the unit, when the unit is arranged in the first position. The outlet opening is closed by the unit when the unit is arranged in a second position. Meanwhile, the valve unit is movably supported between two positions. When the valve element moves in the first mobile area, the flow cross section (A1) continuously changes and provides a reduced flow cross section (A2) relative to the first flow cross section when the valve unit moves in the second mobile area. When the valve unit is in the second position, the valve unit is at the sealed edge.

The invention discloses a control method, device and system for a dust collector and a brushless direct current motor, and the method comprises that: in a rotor pre-positioning stage, the pre-positioning of a rotor of the motor is performed through employing a static pulse positioning method so as to obtain the position of the rotor of the motor; in a low-speed operation stage, a dynamic pulse detection method or a flux linkage function method is adopted to obtain a commutation point of the motor, and the motor is controlled to perform commutation according to the commutation point; and in themedium-high speed operation stage, the counter potential zero-crossing point of the motor is detected in a mode of combining the counter potential zero-crossing detection time interval and the counter potential zero-crossing detection method, and the motor is controlled to perform phase commutation according to the counter potential zero-crossing point. Therefore, the starting and positioning time of the motor can be greatly reduced, the motor is ensured not to rotate reversely during starting, abnormal sound and jitter during positioning are solved, accurate commutation of the motor in a low-speed operation stage can be realized, the reliability is high, a counter electromotive force zero-crossing point can be timely and accurately detected, and the motor is ensured to stably operate atan extremely high rotating speed.

The invention provides an integrated PCR detection experiment cabin. The cabin comprises a protective clothing wearing room, a sample treatment room, a nucleic acid detection room, a buffer room and adisinfection room. When PCR detection needs to be carried out, a cabin body can be transported to a destination through a transport vehicle, and then PCR detection can be directly carried out so thatbuilding time of the PCR detection experiment cabin is greatly saved, and rapid and effective experiment cabin detection points are provided for emergencies. The cabin body can move at any time through the transport vehicle so that PCR detection work can be rapidly carried out.

The invention discloses a flue-cured tobacco intensive float breeding hardening-seedling device, and relates to the technical field of crop planting equipment. The flue-cured tobacco intensive float breeding hardening-seedling device is composed of a floating disk 8, a nursery pond 10, a fixing assembly, a rack assembly, a transmission assembly, a locking assembly and a rope rotating assembly. The floating disk 8 is floated in the nursery pond 10. The flue-cured tobacco intensive float breeding hardening-seedling device has the advantages of being convenient to install, convenient to maintain, easy to use, capable of well achieving the operation of float breeding and hardening-seedling and improving the quality of tobacco seedlings and suitable for float breeding hardening-seedling of various crops.

The invention discloses a distribution box carrying auxiliary device. The device comprises a folding frame mechanism and rolling wheel mechanisms, wherein the rolling wheel mechanisms are installed onthe folding frame mechanism through rolling wheel rotating shafts; the folding frame mechanism comprises a plurality of first supporting plates and a plurality of second supporting plates, wherein the first supporting plates and the second supporting plates are connected through the rolling wheel rotating shafts; and supporting arms are arranged on the lower portion of the folding frame mechanism, and ratchet mechanisms coaxial with the rolling wheel rotating shafts are arranged in the rolling wheel mechanisms. When a distribution box is carried to a concrete table, soil or other objects arelaid under the concrete table to form a slope, the auxiliary device is paved on the slope, the rotating direction of the rolling wheel mechanisms is matched with the inclined upward moving direction of the distribution box, the distribution box is placed on the auxiliary device, and is slowly upwards moved by manually pulling the distribution box, due to existence of the ratchet mechanisms, the rolling wheel mechanisms will not turn over, it is ensured that the distribution box cannot slide downwards, the structure is simple, and the device can be transported by a distribution box transport vehicle.

The invention relates to a diaphragm assembly. The diaphragm assembly comprises a rupture diaphragm, a gasket and a grate. The outer diameter of the gasket is smaller than that of the grate. The gasket is designed with a blind hole. The rupture diaphragm is designed with a protrusion block. When the diaphragm assembly is assembled, the protrusion block on the rupture diaphragm is embedded into the blind hole of the gasket, and one side provided with a nick, of the rupture diaphragm is fitted to the grate. When the diaphragm assembly is mounted, the grate is connected to a flange on the upstream side of the air flow. The diaphragm assembly is made of a pure copper diaphragm and accordingly has good compatibility with high-temperature and high-speed oxygen. The fail-proof design is used for ensuring that the rupture diaphragm is not mounted reversely when the diaphragm assembly is assembled and the diaphragm assembly is not reversely mounted in a pipe.

The invention provides a preparation method of a betel nut with a gum base as a carrier. The preparation method comprises the following steps: uniformly mixing a softened gum base, a concentrated extract of betel nut juice and other auxiliary agents, carrying out standing and cooling, performing extruding through a food sandwich extruder, adding a marinated block added with 6-15% of xanthan gum, conducting homogenizing, carrying out punch forming, and conducting aging to obtain the betel nut. The betel nut prepared by using the method is less in bitterness, obvious in chewiness, complete in gum base texture, good in chewiness, and savory and mellow in taste, and capable of greatly reducing mechanical wearing of teeth, does not puncture oral mucosa, and greatly reduces harm of eating of thebetel nut.

The invention relates to a rice transplanter type vehicle transmission, comprising a transmission cabinet, a differential, steering clutches, a brake, and a steering transmission mechanism. The differential is installed on the transmission cabinet and is connected with a left half axle and a right half axle. The transfer-drive sliding variable gear of a transmission shaft is corresponding to a transfer-drive duplicate gear which is installed on a transfer-drive transmission shaft. A transfer-drive driving taper gear on the transfer-drive transmission shaft is meshed with a transfer-drive output taper gear shaft. Half-shaft output driving taper gears are respectively connected with a left tail end output shaft and a right tail end output shaft through a half-shaft output driven taper gear and respective steering clutches. A differential lock installed on the left half axle is opposite to a differential housing. The brake is installed on a right housing and a differential transmission shaft. The second transfer-drive taper gear on the differential housing is meshed with a second transfer-drive taper gear shaft. The rice transplanter type vehicle transmission is characterized by compact structure, good installation and maintainability, and reliable use, and adapting to multifunctional configuration requirements.

The invention provides a glue injection head and a glue injection machine with the same. The glue injection head comprises a glue head body. Glue injection channels are formed in the glue head body. The glue injection head is characterized in that the glue head body is further provided with pressure holes communicated with the upper ends of the glue injection channels and communicated with a pressure device of the glue injection machine; and under the effect of the pressure device, positive pressure or negative pressure are formed at the upper ends of the glue injection channels. According to the glue injection head and the glue injection machine, the pressure holes are formed, the negative pressure state is formed at the upper ends of the glue injection channels when glue injection is stopped, and liquid glue in the glue injection channels stays in the glue injection channels and cannot drop down continuously under the effect of atmospheric pressure; the positive pressure state is formed at the upper ends of the glue injection channels when the glue injection channels are cleaned, so that all materials can be sprayed out through glue injection nozzles.

The invention discloses a platform construction system. The platform construction system comprises a keel, a cover board and a frame, the frame is fixed to the keel and comprises a plurality of framestrips, and at least one of the left end face and the right end face of every frame strip is inclined or curved. The platform construction system has the advantages of cyclic utilization, good environment friendliness, convenience and quickness in mounting and demounting, high accuracy in mounting and positioning of components, good decoration effect and capability of avoiding reverse mounting ofthe structural components.

The invention discloses a floating power generation system utilizing ocean wave energy, and relates to the technical field of wave power generation. The floating power generation system comprises a floating air bag, a core control box is installed at the bottom end of the floating air bag, connecting rods are installed on the four sides of the core control box, power generation boxes are installed at the ends, away from the core control box, of the four connecting rods, and a first power generation mechanism is installed on the inner side of each power generation box. The first power generation mechanisms and second power generation mechanisms are arranged, when waves are huge, the upward moving force of a floating mechanism on a first rack is large enough, the vertical moving fall of the first rack is large, the first rack moves to enable a first gear to rotate to enable the first power generation mechanisms to generate power, and meanwhile, a control plate at the bottom end of the first rack moves upwards, an idle stroke ring moves upwards, and at the moment, the second power generation mechanisms also generate power, so that the energy utilization rate of the huge waves is increased.

The invention discloses an energy-saving and environment-friendly in-wall wire laying and fixing device for building construction. The device comprises a mounting shell; the mounting shell is connected with two movable rods through an adjusting mechanism; the movable rods penetrate through the two side walls of the mounting shell and are fixedly connected with abutting plates; and the side walls of the abutting plates are fixedly connected with limiting teeth; an empty shell is fixedly connected to the side wall of the mounting shell; a movable plate is fixedly connected to the inner wall of the empty shell through a plurality of reset springs; the side walls of the two sides of the movable plate are slidably connected with the inner wall of the empty shell; two sets of limiting plates areslidably connected to the side walls, away from the reset springs, of the movable plates; the side walls of the limiting plates abut against the inner wall of the empty shell; and the side walls of the limiting plates are fixedly connected with sliding rods. According to the energy-saving and environment-friendly in-wall wire laying and fixing device for building construction of the invention, electric wires and pipelines with different widths can be stably clamped, the steering of the electric wires and the pipelines can be conveniently adjusted, grooves with different widths can be stably fixed, and the positions of the cables and the pipelines can be stably limited.