31results about How to "Realize stepless control" patented technology

The invention discloses a double-acting magneto-rheological pressure and flow control valve which comprises an upper end cover and a lower end cover. The upper end cover and the lower end cover are arranged in a longitudinal symmetry manner, and a thrust shaft is slidably connected into a cavity formed between the upper end cover and the lower end cover; two cavities are formed in rooms among two ends of the thrust shaft, the upper end cover and the lower end cover, and an upper flow control cavity and a lower flow control cavity are respectively mounted in the two cavities; the upper end cover is fixed to the lower end cover by a piston, an upper auxiliary damping hole and a lower auxiliary damping hole are respectively machined on the upper end cover and the lower end cover, and an auxiliary channel which is communicated with the damping holes is arranged in an inner ring of the piston; and the opening of the auxiliary channel is determined by the sliding stroke of the thrust shaft. The double-acting magneto-rheological pressure and flow control valve has the advantages of high response speed and extremely wide bearing pressure range owing to fast yield strength variation response and wide range of magneto-rheological fluid. Besides, the double-acting magneto-rheological pressure and flow control valve is simple and compact in structure, convenient to manufacture and high in portability, and can be connected into an electronic control unit, so that a bidirectional flow can be intelligently and steplessly controlled.

The invention relates to an impeller type feeder used in the fields such as grain, feed, food, chemical industry, medicine and fertilizer. The impeller type feeder has the functions of adjusting a feeding quantity in a stepless mode, removing impurities and preventing blockage. The impeller type feeder is designed with a special adjustable right guide plate (2), when chunk materials enter the feeder, large particles can smoothly enter as a turnover plate (2-5) is stressed to rotate backwards, after the large particles enter, the turnover plate (2-5) is automatically reset to the normal position under the action of an torsion spring mechanism (2-1), the impeller type feeder is suitable for the feeding demands of large-particle materials with higher hardness under different feeding flow conditions, and the materials cannot be blocked under the conditions of smaller flow and large size particularly.

The invention discloses a method and device for controlling a DC motor, wherein the method includes the following steps: obtaining the temperature of the DC motor to be measured at a working speed state, and calculating the difference between the temperature and the preset temperature; The difference between the temperature and the preset temperature is used to calculate the first duty cycle of the pulse width modulation signal used to control the DC motor; the pulse width modulation signal of the first duty cycle obtained according to the calculation is used to control the DC motor in the working speed state run. Since the first duty cycle of the pulse width modulation signal can be accurately adjusted according to the temperature reference factor, the rotational speed of the DC motor can be adjusted with high precision through the pulse width modulation signal. Compared with the control method of dividing the detected temperature into intervals and controlling the operation of the DC motor in different gears in the traditional technology, it realizes the stepless control of the DC motor control.

The invention provides a slide value type hydraulic valve with a differential motion function. The slide value type hydraulic valve comprises a valve body and a valve element which is arranged in a valve body hole; a first undercutting groove, a second undercutting groove, an oil inlet undercutting groove, a third undercutting groove and a fourth undercutting groove are arranged in the valve body hole in sequence, wherein the first undercutting groove and the fourth undercutting groove are communicated with an oil return opening, the second undercutting groove and the third undercutting groove are communicated with a working oil port respectively, and an oil inlet undercutting groove is communicated with an oil inlet; the valve element comprises a left circular bead, a left shaft neck, a middle circular bead, a right shaft neck and a right circular bead from left to right; a circular groove, a first valve port and a second valve port are arranged on the excircle of the left part of the middle circular bead, wherein the first valve port and the second valve port are not communicated with each other; a third valve port and a fourth valve port which are communicated with the right shaft neck are arranged on the excircle of the right part of the middle circular bead and the excircle of the left part of the right circular bead respectively. The slide value type hydraulic valve realizes differential motion function through improving the structure of a main valve element of the hydraulic valve, the integral structure is changed little, so as to reduce the product cost and failure rate of the product; the differential motion function is realized, and stepless control of flow can be realized at the same time.

The invention discloses a production line for measuring size of pipe diameter of sucking pipes on line. The production line comprises an extruder, a cooling device, an electric proportional valve, a two-dimensional laser diameter measuring device and a traction cutter which are arranged in sequence along the direction of the production line, wherein a remote controller is arranged between the two-dimensional laser diameter measuring device and the electric proportional valve and is used for receiving data of diameter values and deviation values output by the two-dimensional laser diameter measuring device; the remote controller is used for sampling in time after receiving the data, sending control signals to the electric proportional valve and controlling the electric proportional valve to correct the deviation values and maintain the consistency of line diameter. The invention also discloses a production method for measuring size of the pipe diameter of the sucking pipes on line. The production line and the production method are capable of carrying out two-dimensional detection on the sucking pipes on line; the laser scanning technique is adopted; the production line and the production method have the advantages of non-contact measurement, wide measurement range, high scanning speed, high measurement accuracy and stable performance.

The invention discloses a double-cylinder eccentric rotary pump. The double-cylinder eccentric rotary pump comprises a first cylinder body and a second cylinder body. The first cylinder body and the second cylinder body are each internally provided with a cavity. The outer end surface of the first cylinder body and the outer end surface of the second cylinder body are each provided with inlets and outlets. The cavity of the first cylinder body and the cavity of the second cylinder body are internally provided with a first rotor and a second rotor correspondingly. Working cavities are formed between the side surface of the first rotor and the cavity of the first cylinder body as well as between the side surface of the second rotor and the cavity of the second cylinder body correspondingly. The first rotor and the second rotor are installed on a first eccentric part and a second eccentric part of the same crankshaft in a sleeving mode correspondingly so that the working cavities can be increased or decreased and the inlets can communicate with the outlets. The first rotor is in clearance fit with the crankshaft, and the second rotor is in clearance fit with the crankshaft. Fixed gears are fixed to the first cylinder body and the second cylinder body. Teeth or gear rings matched with the fixed gears are arranged in the middle of the first rotor and the middle of the second rotor. The double-cylinder eccentric rotary pump is high in efficiency, user-friendly, convenient to transport, easy to maintain and capable of achieving real-time monitoring and stepless speed adjusting.

The invention relates to a magnetorheological pressure control valve. The magnetorheological pressure control valve comprises a valve cover, a coil assembly 2, an upper valve body, a lower valve body, a lower valve core, a first rubber seal ring, a second rubber seal ring, a work cavity, an upper valve core, a reset spring and an adjusting nut. The valve cover is fixedly connected to the upper outer side of the lower valve body. The adjusting nut is connected to the inner side of the upper valve body. The reset spring in the compressed state is arranged under the adjusting nut. The lower portion of the reset spring presses on the upper valve core. The upper valve core is arranged in the upper valve body. The lower portion of the upper valve core presses at the upper end of a disk on the lower valve core. The lower valve core is arranged in the lower valve body. The lower portion of the lower valve core presses on the upper side of an oil inlet of the lower valve body. The work cavity is formed between the upper valve body and the lower valve body. The coil assembly is arranged in a groove of the upper valve body. The upper side of the coil assembly makes contact with the inner side of the valve cover. According to the magnetorheological pressure control valve, the coil assembly is arranged on the upper side of the work cavity and far away from magnetorheological fluid, so that the influence of heating of an electromagnetic coil on the magnetorheological fluid is smaller, and the heat dissipation effect of the magnetorheological fluid is better.

The invention belongs to the field of tracked carriers, and discloses an automatic leveling control system for a carrying platform of a tracked carrier. The system comprises an inclination angle detection module, a central processor module, an execution module and a limiting module, and the inclination angle detection module, the execution module and the limiting module are all connected with thecentral processor module. The inclination angle detection module is installed at the bottom of the carrying platform of the tracked carrier, the limiting module is installed at the bottom of the carrying platform, and the execution module is connected with a hydraulic leveling system of the tracked carrier. According to the system, the inclination state of the carrying platform can be detected inreal time; the carrying platform is automatically leveled, so that the requirements for the leveling real-time performance and stability of the carrying platform of the tracked carrier under a complexworking environment are met, and the problems that in the working process of an existing agricultural tracked carrier, a carrier body jolts, the carrying platform is prone to inclination, the balanceis not easy to achieve, and overturning is prone to occurring, are solved.

The invention discloses a discharging valve. The discharging valve comprises a valve body; two adjusting assemblies which are diagonally arranged are arranged on the valve body, each adjusting assembly comprises a valve plate, a first hinge support, a second hinge support, an electric cylinder, a base and a third hinge support, the first hinge supports are fixed to the inner wall of the valve body, the valve plates are arranged in the valve body, the upper ends of the valve plates are rotationally arranged in the first hinge supports, the second hinge supports are fixed to the outer sides of the lower ends of the valve plates, the bases are arranged outside the valve body, the third hinge supports are fixed to the upper sides of the bases, the electric cylinders are arranged on the side face of the valve body in a penetrating mode, the telescopic ends of the electric cylinders are rotationally connected into the second hinge supports, and the fixed ends of the electric cylinders are rotationally connected into the third hinge supports. According to the discharging valve, stepless control over the opening degree of the valve is achieved, the material flow can be adjusted in real time according to needs, the opening degree of the valve can be adjusted according to the discharging amount of follow-up equipment such as a vertical mill or a roller press so as to adjust the discharging amount, continuous and stable operation of the whole preparation process is guaranteed, and then the production efficiency is improved.

The invention discloses a portable hand drawing supporting device based on artistic design, and belongs to the technical field of school supplies, the portable hand drawing supporting device comprises a first supporting seat, a second supporting seat is arranged above the first supporting seat, and first sliding connecting grooves are formed in the opposite surfaces of the second supporting seat and the first supporting seat. According to the invention, through mutual cooperation of the designed structures such as a first threaded rod, a first threaded cylinder, a projector storage groove, a goose-shaped pipe, a projector, a torsion spring, a reducing sleeve and an elastic clamping piece, in the using process, a hand drawing student can project some line drawing methods on a drawing through the projector; the knowledge field of hand-painted students is expanded, learning and working efficiency is improved, entertainment is increased, the hand-painted students can adjust the inclination and height of the supporting panel suitable for themselves according to needs to conduct more healthy and comfortable learning work, clamping and fixing of a template sample can be achieved through opening and closing actions of the elastic clamping pieces, and the stability of the template sample is ensured.

The invention relates to a vibration preventing device for plate roller outer circle machining. The vibration preventing device is connected with a plate roller arranged on a main machine and used for vibration reducing in the plate roller machining process. The vibration preventing device comprises a water storage tank, an automatic water feeding circulation pump, a proportional flow controller, a vibration sensor and an upper computer. One end of the automatic water feeding circulation pump is connected with the water storage tank, and the other end of the automatic water feeding circulation pump is connected with the plate roller on the main machine through a pipeline. The vibration sensor, the upper computer, the proportional flow controller and the automatic water feeding circulation pump are sequentially connected, and the vibration sensor is arranged on the main machine. The upper computer calculates the water amount for vibration reducing according to plate roller parameters and sends control signals to the proportional flow controller, the proportional flow controller controls the automatic water feeding circulation pump to start to inject water into the plate roller, the vibration sensor feeds real-time vibration signals back to the upper computer, and the upper computer conducts stepless control over the automatic water feeding circulation pump through the proportional flow controller according to the real-time vibration signals. Compared with the prior art, the vibration preventing device has the beneficial effects that the vibration reducing effect is good, and the product quality is improved.