53results about How to "Frequency controllable" patented technology

The invention provides a high-pressure pulsed water jet controllable active seismic source advanced detection device and its use method. The detection device includes a water tank, a water supply pump, a supercharger, a servo motor, a convergent nozzle, a receiving sensor and a seismic wave data acquisition instrument, and the water supply pump is respectively Connect the water tank and the supercharger, the supercharger is connected to the convergent nozzle, the output shaft of the servo motor is connected to the block; the receiving sensor is connected to the seismic wave data acquisition instrument, the water supply pump pumps the water in the water tank into the supercharger, and the supercharger is pressurized The high-pressure water jet is formed, the servo motor drives the block to rotate, and the block is cut off to form a high-voltage pulse jet beam. The high-voltage pulse jet beam hits the working surface to generate shocking seismic waves, and receives the reflected waves from the sensor. The seismic wave data acquisition instrument collects the reflected waves in real time and transmits them to the smart terminal. , the intelligent terminal analyzes the reflected waves and judges the characteristics of bad geological bodies. The invention has the beneficial effects of scientific principle, safety and high efficiency, energy saving and environmental protection, and good application prospect.

The invention discloses an experimental method of simulating dynamic and static load and a device thereof, relating to indoor model experimental technique of geotechnical engineering. The structure of the device is as follows: a model experimental platform (1), a model experimental box (2) and a load transmitting lever (3) are sequentially connected; the load transmitting lever (3) is respectively connected with a static load system (4) and a dynamic load system (5) which are respectively connected with a dynamic signal testing system (6); the dynamic signal testing system (6), a data acquisition system (7) and a computer (8) are sequentially connected. The device caries out dynamic and static load experiments on different structure models, and can monitor and collect non-linear properties of deformation and stress of gneiss under complex load condition in real time. The device has intuitional testing principle, simple structure, high precision, good stability, easy operation, convenient detachment and no high technical requirement to mounting and testing workers.

The invention discloses a measuring device of soil conductivity, mainly comprising a sensor unit and a data acquisition and processing unit; the sensor unit mainly comprises electrodes which are configured in a linear equal interval manner; the data acquisition and processing unit mainly comprises a voltage conversion circuit, a signal conditioning circuit, an analog-to-digital converter, a data controller and a liquid crystal display circuit, and also comprises a alternating-current source signal generating circuit, an alternating-current constant current source output circuit and an alternating-current constant current source regulating circuit. According to the measuring device of soil conductivity, the invention also discloses a measuring method of soil conductivity. The invention canregulate the size of exciting current input into the soil at any time according to soil characteristics of the measured farmland so as to guarantee that the sensor works at the linear area under any soil condition, has high measuring accuracy and also has the function of data display and storage.

A conversion method and circuit from product to pulse applies analog signal product to be converted to certain frequency output pulse in stead of analog circuit existed in present technique. It is made by converting the product of two analog signal into a certain frequency output pulse with the pulse frequency relating to the big or small or signal product, converting analog signal into digital signal 1 and modulated signal 2 by analog-digital converter and modulator, multi plying digital signal, with modulated signal 2 by multiplier to create digital signal 2 which being filtered for product, converting the product into a certain frequency pulse signal by product-pulse converter. The sampling frequency of two route analog signal can be different as well as the working frequency of product-pulse converter and the output frequency of product also can be different.

The invention discloses a dynamic stress-strain curve in-situ test device, which includes a movable system, a dynamic response system, a load servo system and a data acquisition system. The device of the invention is powered by a hydraulic source, and can operate at preset frequencies, amplitudes, The vertical dynamic load is applied to the rigid plate of the vibrator under the number of loading cycles, thereby spreading into the foundation soil. After the pre-embedded sensor senses the measured information, it is converted into a fixed form of signal output by the data acquisition system, which can be analyzed and processed. The working method provides a new method for the field test problem of soil dynamic stress-strain curve.

The invention discloses a two-dimension piezoelectric vibration platform which is characterized in that four piezoelectric stack actuators are symmetrically arranged on upper, lower, left and right sides, wherein the external sides of the piezoelectric stack actuators are fixed on a base plate through screws; hex screws are adopted as the screws; internal sides of the piezoelectric stack actuators are respectively connected with a disc which is located in a middle position through flexible hinges; at least three thread holes are arranged in the disc; four uniformly distributed thread holes are arranged in the disc in the embodiment; a mounting hole is arranged in the base plate; piezoelectric input and output ports are arranged on one side of the base plate and are respectively connected with the piezoelectric stack actuators through leads. The two-dimension piezoelectric vibration platform has the advantages of simple structure, low frequency, controllable vibration frequency, amplitude and waveform, and capability of realizing two-dimension vibration of a workpiece; the efficiency of the applied piezoelectric stack actuators is higher than the efficiency of a single chip; the two-dimension piezoelectric vibration platform has a simple structure, is easy to control and is convenient to produce, so that the two-dimension piezoelectric vibration platform is fit for popularization in the fields of vibration milling or other vibration screening, and the like.

The invention relates to the technical field of woks used in kitchens, in particular to an automatic wok and an automatic stir-frying system. The technical defects that a dish fried by an existing automatic stir-frying device is poor in mouthfeel, and oil fumes cannot be exhausted in time are overcome. The automatic wok comprises a first wok body and a second wok body which cover each other correspondingly, are turned over and heated alternately and serve as wok covers for each other, and one side of the first wok body and one side of the second wok body are hinged through a hinge mechanism. As the two wok bodies are adopted, cover each other correspondingly, are turned over and heated alternately and serve as the wok covers for each other, and in the alternating process of the two wok bodies, food materials are turned over synchronously, directly and sufficiently at the controllable frequency and heated uniformly, the food materials are not prone to breaking and have a good mouthfeel, and labor is saved. The automatic wok is particularly suitable for continuously stir-frying vegetables in a restaurant for a long time, capable of carrying out perfect stir-frying and being heated uniformly and high in steaming and stir-frying efficiency.

The invention discloses a test device for applying continuous impact load and a method thereof, which comprises an internal gear, an external gear, a guide bearing group, a guide rail, an impact rod, an action head, an elliptical gear group and a power gear. The top of the guide rail is fixed on the overall support, and the test piece is placed in the test bench at the bottom. The power gear drives the elliptical gear set, and transmits power through the internal gear, external gear and guide bearing set. The impact rod and the action head reciprocate vertically along the guide rail to exert continuous impact load on the specimen. The ratio of the inner diameter of the internal gear to the outer diameter of the external gear is 2:1, and the hypocycloid trajectory of any given point on the external gear is linear reciprocating motion. The variable rotation speed can be obtained by adjusting the meshing mode of the elliptical gear set, thereby realizing the continuous application of impact loads of different sizes and frequencies; the invention has simple structure, convenient operation, and safe and controllable operation.