Abstract: Provided is an electric cable driving mechanism having a self-return function. The electric cable driving mechanism includes a housing assembly, an electric motor, a three-stage transmission mechanism and a multifunctional nut, the three-stage transmission mechanism includes a coil spring assembly, the electric motor is fixed to the housing assembly, and the three-stage transmission mechanism and the multifunctional nut are mounted in the housing assembly; and the multifunctional nut includes two cable mounting grooves and is in transmission connection to the electric motor by means of the three-stage transmission mechanism. According to the electric cable driving mechanism having a self-return function of the present disclosure, the three-stage transmission mechanism is used, and outputs a larger force compared with two-stage transmission; and a split multifunctional screw rod is easy to mount, such that mounting of a coil spring during assembly is prevented from scratching the screw rod.

Abstract: Embodiments of the disclosure provide a circuit, chip, system, and method for eliminating random perturbation. The circuit includes a weight calculating module for receiving digital signals and random perturbation digital quantity, using least mean square error algorithm to calculate weight deviation iteration coefficient based on digital signal and digital quantity, and updating perturbation weight in real-time according to weight deviation iteration coefficient; and a perturbation eliminating module for eliminating perturbation signal in output digital signal of quantizer according to perturbation weight updated in real-time and updating perturbation weight in real-time according to weight deviation iteration coefficient, and then calculating current perturbation weight in real time to realize self-calibration of perturbation weight.

Abstract: The present disclosure relates to a grouting material for reinforcement of coal-rock mass in low-temperature mining. The material includes a component A and a component B, where the component A includes 100 parts of a polyether polyol A and 0.05 parts to 0.1 parts of a catalyst; the component B includes 18 parts to 24 parts of a polyether polyol B, 21 parts to 26 parts of a flame retardant, 50 parts to 61 parts of polyisocyanate, and 0.05 parts of the catalyst. A preparation method of the grouting material includes the following steps: stirring the polyether polyol A and the catalyst to obtain the component A; drying the polyether polyol B and mixing with the polyisocyanate and the catalyst, and conducting a reaction to obtain an isocyanate prepolymer; adding the flame retardant to the isocyanate prepolymer, and adjusting a viscosity to obtain the component B.