30results about How to "Reduce shaking effect" patented technology

The invention discloses cutting equipment convenient to operate. The cutting equipment comprises a cutting blade, a driving part used for driving the cutting blade to rotate, a cutting table, a clamping device arranged on the cutting table, a dustproof device with a dustproof effect after cutting is carried out and a pressing rod device used for pressing of the driving part and the cutting blade downwards. The clamping device is provided with a first clamping assembly and a second clamping assembly, and a clamping piece is arranged on the first clamping assembly. The pressing rod device is provided with a housing, a handle rod fixedly arranged on the housing, a supporting rod with one end fixed to the housing and the other end rotationally arranged on a table plate, a pull rod with one endmovably connected to the housing and the other end rotationally arranged on the table plate, a dragging rod rotationally arranged on the table plate and a torsional spring with one end arranged on the dragging rod and the other end arranged on the table plate. According to the cutting equipment, the influence of a motor on shaking of the cutting blade is reduced, so that the cutting blade is notprone to fragmentation, different pipes can be clamped for cutting, clamping is firm, operation is convenient, the pipes can be cut at different angles, and the cutting size precision is high.

The invention discloses a driving assistance type vertical-seam fishway structure and a fish gathering method thereof. The driving assistance type vertical-seam fishway structure comprises a bottom plate, a side wall, multiple long separating plates, multiple short separating plates and multiple driving assistance platforms, wherein a fishway is divided into multiple pool chambers by the long separating plates and the short separating plates, and fish passing vertical seams are reserved between the long separating plates and the short separating plates; each driving assistance platform is formed by a J-shaped plate, an arc-shaped separating plate, a water outlet seam, a water supplementation seam and a small-sized wave generation machine, and arresting nets are arranged at the outer sides of the arc-shaped separating plates. According to the driving assistance type vertical-seam fishway structure disclosed by the invention, the water flow in the pool chambers and the fish passing situation in the positions of the fish passing vertical seams can be monitored in real time by cameras which are arranged in the long separating plates, images can be synchronously transmitted to a computer automatic control system for being analyzed, a command for regulating and controlling the frequency of the small-sized wave generation machine can be sent from the computer automatic control system to the small-sized wave generation machine, the water flow which is suitable for fish migration and the water sound which is capable of attracting fish to swim upstream can be formed in the corresponding pool chamber, the fish passing efficiency of a traditional vertical-seam fishway can be obviously increased, the influence on the fish migration caused by hydro-power and hydraulic engineering can be reduced, and the driving assistance type vertical-seam fishway structure is beneficial for ecological protection for a river.

The invention provides a crane, a crane tower arm control method and a crane tower arm control device and relates to the technical field of engineering machinery. In the crane, a telescopic coil cylinder is provided with a distance sensor used for detecting the telescopic length of the telescopic oil cylinder; meanwhile a tower arm winch is provided with a turn number detection mechanism used fordetecting the number of turns of the winch so that a controller can be used for acquiring the actual length of a main arm and the actual length of a rope unwound by the winch and obtaining the targetlength of the rope unwound by the winch by calculating the actual length of the main arm; the rope winding or rope unwinding speed of the winch is regulated according to a comparison result of the target length of the rope and the actual length of the rope so that the actual included angle between the main arm and the tower arm is kept within a preset included angle range; coordinated regulation is realized by regulating length relationship between the tower arm and the main arm; the control precision is relatively high, thus good posture of a hoisting arm in a lifting process or a descendingprocess is maintained; rollover of the crane is effectively prevented; and better reliability of the crane is realized.