3results about How to "Prevent topping" patented technology

The utility model discloses a laser rangefinder for lifting a table board, which comprises a shell and a laser ranging module arranged in the shell, the shell is provided with a probe hole for laser to penetrate through, the shell is also provided with a notch part, the inner side of the notch part comprises a first reference surface and a second reference surface which extend in different directions, and the first reference surface and the second reference surface are arranged on the shell. The extension direction of the first reference surface is perpendicular to the extension direction of the probe hole. According to the lifting table, the ground clearance of the lifting table board can be accurately measured through the laser range finder, whether the lifting table board is inclined or not can be conveniently judged, and the laser range finder can be rapidly positioned on the lifting table board so that measurement can be conveniently conducted. In addition, the utility model further discloses an electric lifting table provided with the laser range finder.

This utility model discloses a composite safety braking device for elevator cars, comprising: an elevator control system, a first drive module, and a second drive module; the elevator control system is connected to the first drive module and the second drive module; the elevator control system is used to monitor the car's operating signals, upper leveling signals, and lower leveling signals to determine the car's operating status and position; the first drive module is used to brake the traction sheave to indirectly stop the car; the second drive module is used to directly stop the car at the target position on the elevator guide rail to achieve secondary protection; the first drive module brakes the traction sheave to achieve conventional stopping; while the second drive module can directly act on the elevator guide rail to firmly fix the car at the target position, effectively overcoming the safety hazards caused by traditional braking systems relying on mechanical transmission links such as steel wire ropes and traction sheaves.

This invention relates to the field of belt conveyors and discloses a tensioning device for a long-distance belt conveyor, comprising a tensioning trolley and a tower counterweight device. The tensioning device includes a braking drum mechanism disposed between the tensioning trolley and the tower counterweight device. The braking drum mechanism includes a support bracket fixed to the ground, a drum for winding multiple turns of steel wire rope, and a braking mechanism for braking the drum. The support bracket has two suspended extension ends, the drum is rotatably disposed between the two suspended extension ends, and the braking mechanism is disposed at one end of the drum's axial direction. This tensioning device, by adding a braking drum mechanism between the tensioning trolley and the tower counterweight device, brakes the steel wire rope when encountering instantaneous changes in tension, thus fixing the steel wire rope and preventing the tower counterweight device from overshooting or crashing to the ground.