摘要:
A cable control apparatus having a carrier and one or more trigger points disposed on a cable. A control mechanism controls movement of the cable and has a plurality of sensors to sense the one or more trigger points, and a motor to impart movement to the cable. A first sensor stops the motor and reverses direction of the cable to bring the predator to a base location, a second sensor stops the motor when the carrier reaches the base location, and a third sensor restarts the motor.
摘要:
A boat lift braking system includes a threaded shaft driven by the boat lift motor. A torsion tube disposed about the shaft carries an interiorly threaded nut that interengages the peripheral threads of the shaft. A rotor is mounted to the nut adjacent a brake pad that is supported by a ratchet component. A pawl mechanism cooperates with the ratchet component for limiting rotation of the ratchet component in a first direction and permitting rotation of the ratchet component about the shaft in a second direction. The torsion tube is connected through a reduction apparatus to the winder of the boat lift. When the lift is at rest, a torsion spring drives the torsion tube and rotor against the brake pad and the ratchet component interlocks with the pawl mechanism to hold the lift at a desired elevation. When the motor is driven to lower the lift, the shaft is driven within the torsion tube such that the rotor momentarily disengages the pad. Immediately thereafter, the torsion spring forces the rotor back against the pad and these counteracting forces continuously repeat to provide a controlled descent. When the motor is operated to raise the lift, the shaft is driven relative to the torsion tube such that the rotor and pad interlock. The ratchet component disengages the pawl and the torsion tube turns so that the lift can be elevated.
摘要:
A safety system for an elevator car which will prevent movement of the elevator car should the car drift beyond a predetermined distance from the hoistway sill with the car door in an open position.
摘要:
The variable frequency drive of a motor monitors pulse generator feedback while the motor is stopped and an electromechanical brake is set. When the pulse generator feedback exceeds a predetermined level indicative of brake failure, tie controller actuates the motor to operate in zero servo mode and maintain the load. An alarm is also sounded, allowing an operator to safely lower the load.
摘要:
This invention includes a brake system for a hydraulic ram or another cylinder, that can be employed as an emergency brake for a lifting elevator. When actuated, the brake arms contact the ram circumferentially to slow and stop the falling ram. The brake arms are preferably lined with an able material that frictionally engages the ram to stop the downward motion of the ram. The brake system may be actuated by loss of hydraulic pressure, by an electronic signal from a hydraulic pressure detector, by down overspeed sensor or by an uncontrolled down motion detector. According to another aspect of the present invention, a controller, which is preferably a programmed control system, compares the actual motion of the elevator as sensed by a detector to a desired motion. Under certain conditions, if the actual motion differs from the desired motion, the controller actuates the brake.
摘要:
An elevator brake regulating apparatus includes brake actuators, a source of pressured fluid and a brake regulating control connected between the actuators and the fluid source. A fastening housing is attached to a carrier frame of a elevator car and has recesses for retaining guides of a brake shoe with elastic pads to provide vertical displacement of the guides under braking. The brake shoe has brake pads for engaging running surfaces of a guide rail. A brake sensor in each brake pad monitors the condition of the brake pad and signals the control to apply pressured fluid to actuate the corresponding brake actuator. Other sensors for speed, acceleration and retardation of the elevator car are connected to the control for selectively applied the pressured fluid to regulate the braking force on the elevator car.
摘要:
A shaft winding or winch system for raising and lowering a load attached to one end of a rope. The system includes a brake unit for braking a drum, a detection unit for detecting the length of the rope, and a control unit for controlling the brake unit according to the detected extended length of the rope and the torque generated by the drive unit.
摘要:
A safety device for an elevator which detects a trouble of the control device quickly to apply an emergency brake, thereby to ensure the safety of the people in the cage. The elevator safety device is so designed that the harmonic wave component produced by an inverter is detected with the aid of a band-pass filter, and when the harmonic wave component thus detected becomes abnormal, an emergency stop instruction is produced.
摘要:
A first acceleration reference value is continuously determined by a nonlinear distance control. In parallel thereto, a second acceleration value is generated by a nonlinear velocity controller. A simple selection criterion that comprises only these two alternative acceleration values engages the second alternative acceleration reference value engagement for run up. The first alternative acceleration reference value initiates the destination braking. The second alternative reference value is used for approaching the destination position. The trip destination and the velocity of the positioning drive can be accommodate inching velocities.
摘要:
Operational control system for lift and elevator machinery adapted for electrodynamic braking, said operational control system being adapted to be connected to the machinery of existing lift or elevator equipment. The operational control system is designed for one-speed A.C. synchronous motors of the short-circuit type forming part of operational control units provided with a simple mechanical brake. The operational control system improves the stop-plane exactitude and reduces brake wear. In the operational control system electrodynamic and mechanical braking is combined, the control being performed via a reference voltage formed from an output signal received from a speed-sensing member.