40results about How to "Continuously adjustable speed" patented technology

The invention provides a film bidirectional accurate stretching device. The device comprises a first driving motor, a transverse stretching mechanism, a longitudinal stretching mechanism and a tensionsensor, wherein the transverse stretching mechanism and the longitudinal stretching mechanism are horizontally and vertically arranged, each of the transverse stretching mechanism and the longitudinal stretching mechanism comprises a strip-pressing stretching mechanism and a plurality of point-pressing stretching mechanisms, the point-pressing stretching mechanisms are in relative sliding connection with the strip-pressing stretching mechanisms, the strip-pressing stretching mechanism of the transverse stretching mechanism and the point-pressing stretching mechanisms of the longitudinal stretching mechanism correspond to each other at the same time to act, and the point-pressing stretching mechanisms of the transverse stretching mechanism and the strip-pressing stretching mechanism of thelongitudinal stretching mechanism correspond to each other at the same time to act. According to the device, in the single-direction stretching operation, the defects that a stretched film is wide intwo ends and narrow in middle are avoided, the overall shape of the stretched film is preliminarily ensured, the stretching effect is guaranteed, the tensile thin degree is uniform, and the defect that the stretching point is uneven in thickness due to fixed point stretching by adopting point-pressing fixation in the prior art is avoided.

This invention relates to a fan regulation system with an error-tolerance ability including an input voltage testing circuit, a PWM circuit, a switch supply circuit and a fan set, in which, the control signal of rotation speed of the system and tested voltage signal control the output of the PWM waveforms, control the switch devices of a switch supply circuit and output a suitable voltage to the fan set, when the fan is tested to be faulty, the duty ratio of the PWm waveform can be adjusted.

The invention relates to a variable flow impeller comprising a sealed pump shell, a main impeller and an output impeller respectively arranged in the left and right side of pump shell cavity. The main impeller is a variable flow impeller having a restrictor, the pump shell cavity is a ring cavity, and the main impeller and the output impeller have arc shape adaptive to the ring cavity shape. C shape cavities with opposite openings are respectively arranged on front disks of the main impeller and the output impeller. The main impeller and the output impeller are arranged in the pump shell, and the main impeller is controlled by the restrictor. The rotation speed of the output impeller can be changed as long as adjusting the flow of the variable flow impeller during work, thereby realizing the continuous adjustment of the rotation speed, effectively reducing the flow resistance during flow and improving work efficiency.

The invention discloses a front demounting conveying system for a scrapped automobile demounting line, which comprises a supporting bottom frame, a conveying plate chain, a driving mechanism and a PLC (programmable logic controller) module, wherein the conveying plate chain is mounted on the supporting bottom frame, the driving mechanism and the PLC module are connected with the conveying plate chain, and the driving mechanism is connected with the PLC module. By means of the technical scheme, completely automatic operation is realized, conveying efficiency is high, operation is table, storing stability of a demounted vehicle body can be guaranteed to meet requirements of dynamic demounting, and further, the speed of the conveying system is continuously adjustable by means of a frequency-variable motor.

The invention relates to a test device of fluid corrosion test, and in particular relates to a metal corrosion test device of a gap flow field. By adopting the metal corrosion test device, the problem of difficult in-situ characterization monitoring of electrochemical corrosion properties under gap flow in the prior art can be solved. The device comprises a metal corrosion electrode, an auxiliary electrode, a reference electrode, a reaction kettle body, a reaction kettle cover, a rotor, a rotating component, a rotating motor, an external circulating water pipe, a circulating water temperature control kettle body and a circulating pump. According to the metal corrosion test device disclosed by the invention, the corrosion evaluation and detection under gap fluid and gap multi-phase flow environments can be achieved, and the electrochemical corrosion property testing and analysis can be achieved by using the metal corrosion electrode, the auxiliary electrode and the reference electrode which are arranged on the surface of a reaction kettle and matching with an electrochemical workstation; and the device can be used for simulating corrosion behaviors of different geometric components such as shield motors, water lubricated bearings and drill rods in the gap fluid environments with different temperatures and flow velocities, so that the test support can be provided for material selection and corrosion lifetime evaluation of relative parts.

The embodiment of the invention discloses a signal acceleration method and circuit, and the method comprises the steps that a programmable logic gate array (FPGA) generates a plurality of paths of first test signals, and inputs each preset number of paths of first test signals in the plurality of paths of first test signals to a serializer; each serializer performs serial acceleration processing on the preset number of paths of first test signals to generate high-speed test signals corresponding to each serializer; each serializer inputs a corresponding high-speed test signal to the first mechanical switch, and the first mechanical switch outputs any one high-speed test signal in all high-speed test signals. By the adoption of the signal acceleration method, the speed range capable of being tested based on the signal acceleration method can be larger.