33results about How to "No need to add length" patented technology

A transmission is provided that combines first and second countershafts with planetary gear sets and utilizes the first and second gear sets to provide a torque ratio. Each countershaft supports gears in no more than five coplanar intermeshing gear sets (in most embodiments no more than four coplanar intermeshing gear sets), thereby minimizing the overall length of the countershaft. The transmission provides reverse and at least nine forward speeds, and utilizes only eight torque-transmitting mechanisms.

The invention relates to a dual-footboard device mounted on electric two-wheeled / three-wheeled vehicles. The dual-footboard device comprises a lower footboard and a front footboard, wherein the lowerfootboard is mounted on a vehicle body lower beam; the front footboard is mounted on two sides of a vehicular front main beam and a vehicular front wheel; the front footboard is higher than the lowerfootboard. The dual-footboard device provides two footboards for a rider; the rider may alternate the feet on the two footboards and stretch the legs, thereby relieving riding fatigue and benefiting traffic safety.

The invention provides an underground coal mine fracture sealing device and method. The underground coal mine fracture sealing device comprises a water injection pipe, a thick liquid return pipe, a front polyurethane hole sealing section, a back polyurethane hole sealing section, a safety valve, an umbrella type supporting device assembly and a thick liquid injection pipe. The umbrella type supporting device assembly is composed of an umbrella supporting frame, a supporting pipe, a sliding hoop, a piston rod and a piston, and a guide rail groove and the safety valve are arranged on the supporting pipe. When being fed into a drill hole, the umbrella type sealing device shrinks, and then the device is conveniently fed into the drill hole. When high-pressure water of which the initial injection pressure is 5MPa is injected, the umbrella type supporting device is opened, the piston is pushed forwards, the umbrella type supporting frame is unfolded and penetrates into coal, the high-pressure water continuously squeezes the hole sealing sections, and then the umbrella type supporting frame penetrates into the coal deeper and deeper. When the water injection pressure is increased to be larger than or equal to 15MPa, pressure water breaks through the safety valve to carry out fracturing operation on the drill hole, and therefore pressure loading capacity of the hole sealing sections is greatly improved, water injection pressure is increased, and the fracturing effect is improved. The underground coal mine fracture sealing device is simple in structure, easy to operate, high in pressure loading capacity, and good in sealing effect.

The invention discloses a tunneling movable dust removal device which comprises a ventilating pipe. The ventilating pipe is connected with a dust removal chamber, the two sides of the dust removal chamber are respectively provided with a traveling device, a spray device is arranged in the dust removal chamber, a water collecting tank is arranged below the dust removal chamber, an air outlet is arranged on the dust removal chamber, an inlet of a water suction pump is connected with the water collecting tank, and an outlet of the water suction pump is connected with the spray device. A filtered water dust removal net is obliquely arranged below a dust outlet of the ventilating pipe, and the lower end of the filtered water dust removal net is provided with a silt chute outlet. A silt sediment tank is arranged below the filtered water dust removal net, one end of the silt sediment tank is provided with a grid water outlet, a desilting overflow weir is arranged near the grid water outlet, and a silt-flushing open-close channel is arranged near the desilting overflow weir. The dust removal device disclosed by the invention can move along with the moving of a tunneling machine, so that the effect of dust removal is enhanced. The dust removal device can effectively absorb 90% and more of dust in front of a tunnel face, so that a good sight and relatively clean air are provided for drivers of tunnel boring machines and other operators.

The invention discloses a device for weakening the rarefaction wave of a hydrogen-oxygen detonation shock tube, which includes a detonation driving section, a transition section, a driven section, a diaphragm and a baffle. The detonation driving section, the transition section and the driven section are connected in sequence. The diaphragm is arranged at the joint of the detonation driving section and the transition section. The baffle is arranged at the joint of the transition section and the driven section. The upper end of the baffle is hinged to the pipe of the transition section or of the driven section. After the incident shock wave formed by the detonation driving section breaks the diaphragm, the baffle is lifted up to allow the incident shock wave to pass and be propagated to the driven section. Part of the incident shock wave is reflected by the baffle and interferes with rarefaction wave, so that the attenuation effect of the rarefaction wave on the incident shock wave is weakened, and the steady flow time of the incident shock wave is prolonged. After the incident shock wave passes through the baffle, the baffle is closed again under the action of gravity. The invention further provides a method for weakening the rarefaction wave of a hydrogen-oxygen detonation shock tube. Through the device and the method, the rarefaction wave of a hydrogen-oxygen detonation shock tube can be weakened, and the steady gas flow used in experimental study can exist longer.

In order to solve the problem that existing photodetectors have low responsivity and cannot meet the requirements of high optical power detection, an embodiment of the present application provides a photodetector, which relates to the technical field of photodetectors, and the photodetector includes: a silicon layer , the silicon layer includes a doped region of the first doping type; a germanium layer in contact with the silicon layer, the germanium layer includes a doped region of the second doping type; a silicon nitride waveguide, the nitride A silicon waveguide is disposed around the germanium layer along the extension direction of at least three sidewalls of the germanium layer; wherein the silicon nitride waveguide is used to transmit an optical signal and couple the optical signal to the germanium layer, The germanium layer is used to detect the optical signal and convert the optical signal into an electrical signal.

The invention provides a vehicle coupler, which belongs to the technical field of carriage connection. The vehicle coupler is fixed on a traction beam. The pull hook includes a hook body and a rod body extended from the hook body, and the hook body is located outside the traction beam, and the hook body is located inside the traction beam; The seat is provided with a first through hole and a plurality of first mounting holes, the axial direction of the first through hole is parallel to the longitudinal direction of the drawing beam, the axial direction of the first mounting hole is parallel to the transverse direction of the drawing beam, and the mounting seat is located in the drawing beam. And it is connected with the traction beam through the bolt inserted in the first installation hole; one end of the buffer device is connected with the rod body through the first through hole, and the other end of the buffer device abuts against the mounting seat. The vehicle coupler provided by the invention can reduce the potential safety hazard of the carriage and save the installation space of the draw hook, and at the same time, avoid the shaking of the carriage when it just receives the traction force of the draw hook.

The invention provides display equipment which comprises a shell and a display screen module. The display screen module is placed in the shell; and a mounting screw hole is placed on the display screen module. The display equipment further comprises a switching nut column. The nut column comprises a nut and a stud which are fixedly connected together. The stud is connected in the mounting screw hole in a threaded mode. The switching nut column is supported between the display screen module and the back side of the shell. A mounting hole is further formed in the back side of the shell, and is placed opposite to a screw hole of the nut. Because the stud of the switching nut column is connected on the mounting screw hole of the display screen module in the shell of the display equipment in a threaded mode, the nut is against the back side of the shell, the switching nut column is supported between the back side of the shell and the mounting screw hole, a sink pit is not needed to be arranged in the back side of the shell of the display equipment, and wall hanging requirements of a video electronics standards association (VESA) standard can be satisfied without adding extra accessories.

In order to solve the problem that the existing photodetector has obvious saturated absorption effect and low responsivity, an embodiment of the present application provides a photodetector, which relates to the technical field of photodetectors. The photodetector includes: a silicon layer, the The silicon layer includes a doped region of the first doping type; a germanium layer in contact with the silicon layer, the germanium layer includes a doped region of the second doping type; a first layer waveguide, the first layer waveguide includes A first detection coupling region disposed above the germanium layer; a second layer waveguide, the second layer waveguide including a second detection coupling region disposed on the side of the germanium layer; wherein, the first layer waveguide and the second layer waveguide The second-layer waveguide is used to transmit optical signals, and the first-layer waveguide and the second-layer waveguide respectively couple the optical signal to the a germanium layer; the germanium layer is used to detect the optical signal and convert the optical signal into an electrical signal.