38results about How to "Lower limit requirement" patented technology

The invention discloses a scissor type forklift walking mechanism for secondary lifting and belongs to the field of machinery maintenance. The scissor type forklift walking mechanism comprises a fixed base plate, a movable base plate, vertical plates, a short suspension plate and a roller mechanism. One end of the movable base plate is connected inside the fixed base plate in a sleeve mode; the vertical plates are vertically arranged on the other end surface of the movable plate, the top ends of the vertical plates are fixedly provided with the short suspension plate, and the cross section of the combination of the vertical plate and the short suspension plate is in the shape of an inverted U; the roller mechanism comprises a guide sleeve fixed onto the vertical plates, the guide sleeve is fixed on one side of the short suspension plate, the lower end of the guide sleeve is fixedly provided with a spring, the inside of the guide sleeve is provided with a guide rod, the lower end of the guide rod is provided with a support rod, and the support rod is arranged inside the spring and fixedly connected with a base; the upper end of the guide rod is horizontally provided with a rotating shaft, and the rotating shaft is provided with a roller. According to the scissor type forklift walking mechanism, one end of the movable base plate is connected inside the fixed base plate in the sleeve mode, so that length adjustability of the base plates can be achieved, and further the scissor type forklift walking mechanism can lift automobiles of different widths. Meanwhile, by means of the roller mechanism, the scissor type forklift walking mechanism can avoid breakage of a roller shaft due to overlarge stress.

The invention discloses an optical illumination system for linear CCD scanning. The optical illumination system at least comprises a first linear light source, a second linear light source, a third linear light source, a spectroscope, a second Fresnel lens, a third Fresnel lens, a second retroreflector and a third retroreflector. The first linear light source, the second linear light source and the third linear light source are arranged above a detected object and on the front side face and the rear side face of the detected object respectively, and are all horizontally arranged, the right upper surface, the front side face and the rear side face of the detected object are irradiated at the same time, and shadowless lighting is achieved. The first linear light source, the second linear light source and the third linear light source are all formed by matching low-power halogen lamps with optical fibers. The optical illumination system is high in uniformity, large in incident angle and capable of achieving stereoscopic illumination of the front face and the side faces on the detected object, the reflected light of a scanned object directly enters a CCD to be imaged, no optical filter is needed, the resolution range is wide, the limiting requirement for scanned materials is low, the light path structure is simple, energy consumption is low, the energy rate is high, and the service life is long.

The invention discloses a scissor type lifter walking supporting mechanism, and belongs to the field of machinery maintenance. The scissor type lifter walking supporting mechanism comprises a vertical plate, hanging plates, idler wheels and elastic supporting mechanisms, wherein identical hanging plate grooves are formed in the two ends of the vertical plate; the elastic supporting mechanisms are fixedly arranged at the bottom ends of the hanging plate grooves; each elastic supporting mechanism comprises a sleeve rod, a sleeve and a spring, each sleeve is fixedly connected with the bottom end of the corresponding hanging plate groove, each sleeve rod is sleeved by the corresponding sleeve, the upper end of each sleeve rod is fixedly connected with the lower end of the corresponding hanging plate, each sleeve rod and the corresponding sleeve are respectively arranged inside each spring, and the two ends of each spring are fixedly connected with the bottom end of the corresponding hanging plate groove and the lower end of the corresponding hanging plate respectively; the same idler wheels are further arranged at the two ends of the vertical plate. The adjustability of relative positions of two scissor type lifters can be realized through the arranged elastic supporting mechanisms, so that the application range of the lifters is improved, the springs can be prevented from being damaged by elastic limit repeatedly, and the service life of the whole device is prolonged. The scissor type lifter walking supporting mechanism further has the advantages of simple structure, reasonable design and easy manufacture.

The invention discloses a finger vein identification device and an identification method thereof, comprising a sealed cavity and a controller, a plurality of near-infrared light-emitting diodes are arranged above the sealed cavity, a vein identification area is arranged on the sealed cavity; A shading plate is provided; an optical filter is arranged below the vein identification area; an induction circuit is arranged on the vein identification area, and the induction circuit is connected with the controller; more than one camera is provided on the sealed cavity; the number of cameras is Three; there is a memory in the controller; the identification method is to number the three finger contour images captured by the three cameras; the second step: measure the width of the three finger contour images respectively and compare them , the picture corresponding to the maximum value is the best image; the feature code of the best image is extracted, and the feature code is stored or compared with the stored information. The present invention reduces the limit requirement of placing fingers horizontally, and improves the usability of vein identification equipment.