1422results about How to "Fast adjustment" patented technology

A drive device for pivoting adjustable blades of a turbomachine is provided. The drive device includes an annular flow channel section surrounded by a blade carrier, the section extending along the center line of the blade carrier and blades being provided in the section in a ray-like manner, forming a ring, wherein each of the blades can be pivoted about the longitudinal axis thereof and each has a pin which extends at least into the blade carrier and is coupled to at least one adjustment ring which encloses the blade carrier and may be driven by means of at least one motor. In order to provide a particularly low-wear and reliable drive, the drive shaft of the motor or motors is coupled to the adjustment ring or adjustment rings by means of a pinion gear.

The invention discloses an OLED module Gamma adjustment and calibration method based on linear interpolation calculation. The method comprises the steps of obtaining a brightness target value and a color coordinate target value of each target binding point according to the brightness value of a highest gray scale W255 and the brightness value of a least gray scale W0; selecting an adjusting and calibrating fixed point from the target binding points, and adjusting the R register value and G register value of the adjusting and calibrating fixed point so that a color coordinate is in an error range of the color coordinate target value; adjusting the R register value, the G register value and the B register value of the adjusting and calibrating fixed point so that the brightness value is in an error range of the brightness target value; and calculating the R register value, the G register value and the B register value of other target binding points according to the R register value, the G register value and the B register value of the adjusting and calibrating fixed point according to a linear interpolation method. The method can be used for performing brightness and coordinate adjustment on an OLED module finished product after an IC is bound so that the brightness satisfies a Gamma 2.2 curve and the color temperature accords with a CIE 1931 standard. Furthermore the adjusted register is solidified into the EEProm of the OLED module IC so that a display effect which most accords with a human eye vision curve and a specific color temperature is displayed after the OLED module is electrified.

An aerodynamic component such as a helicopter rotor blade has an aerodynamic flow profile, a free end and a mounting end forming a blade root for attachment to a rotor mast. A blade section between the root and the free end has a leading edge and a trailing edge as viewed in the flow or chord direction. The blade is enclosed on its suction side and its pressure side with a respective skin. A nose flap or leading edge flap is secured to the leading edge by a bearing or hinge. The blade tilting angle is adjustable by piezo-drive elements arranged in at least one pair forming an actuator for each nose flap. The piezo-elements of a pair are arranged in the chord direction one behind the other and the pair is secured to the body of the blade by a fixed point positioned between the elements of a pair. The expansion and contraction from the piezo-element closer to the trailing edge is transmitted to the flap by a push rod. The expansion and contraction of the piezo-element closer to the leading edge is transmitted to the flap by a pronged pull-fork. The push rod and the pull-fork drive a free end of a lever secured to the flap, whereby a displacement of the push rod or of the pull fork causes the tilting adjustment of the flap by a push-pull action.

The invention discloses an intelligent anti-rollover control system for an oil tank truck and a use method. The intelligent anti-rollover control system comprises a truck frame, a tank body, multi-dimensional pneumatic pressing plate adjusting devices, a combined pressing plate, annular gravity center adjusting devices, six-dimensional posture adjusting bionic wheel legs, a central control unit, a tank body gravity center controller and tank truck sensors. The use method is mainly characterized as follows: the central processing unit performs coordination control on the tank body gravity center controller and a wheel leg posture adjusting controller; the tank body gravity center controller performs coordination control on a pressing plate adjusting controller, a pressing plate controller and an annular gravity center adjusting controller; the wheel leg posture adjusting controller performs six-dimensional posture adjusting on the six-dimensional posture adjusting bionic wheel legs. The intelligent anti-rollover control system can realize real-time online monitoring and control of the gravity center of a chassis of the oil tank truck and the gravity center of the tank body of the oil tank truck, prevent rollover when the oil tank truck is disturbed by the bad road surface and the outside in a high-speed running state and remarkably improve the running stability, safety and the anti-rollover capacity of the oil tank truck.

The invention provides a clock adjustment circuit and an adjustment method for a clock circuit. The clock adjustment circuit comprises a clock buffer amplifier, a phase discriminator and a duty cycle adjustment circuit, wherein the clock buffer amplifier is used for receiving an external differential clock signal, shaping the differential clock signal into a single-end square wave clock signal and outputting the single-end square wave clock signal; the phase discriminator is used for receiving the single-end square wave clock signal from the clock buffer amplifier and a feedback signal from the duty cycle adjustment circuit, comparing the phase of the single-end square wave clock signal with the phase of the feedback signal to acquire a phase difference, and outputting the phase difference; and the duty cycle adjustment circuit is used for adjusting the duty cycle of the feedback signal by using the phase difference to acquire an adjusted feedback signal. The differential signal is shaped into the single-end square wave clock signal, the single-end square wave clock signal is compared with the feedback signal to acquire the phase difference, and the duty cycle is adjusted according to the phase difference, so that the complexity of duty cycle adjustment and hardware implementation can be effectively reduced, phase errors and the ripple waves of control voltage can be reduced, and adjustment accuracy is improved.

The invention discloses a reactive phase modulation method for a photovoltaic power station. Active power is emitted while own reaction output capacity of a grid-connected inverter is fully utilized as a supplement or a substitute of reaction compensation equipment, and configuration capacity of an SVG (static var generator) in an original photovoltaic power station is reduced to greatest extent or even without configuring the SVG, so that cost of the photovoltaic power station is greatly lowered; a reactive phase modulation subsystem uses a multi-target dynamic optimization algorithm to dynamically calculate a reactive target value of each power generating node, large occupied area of the photovoltaic power station and position dispersion of a photovoltaic array are taken into consideration, reactive in-place balance is realized, and flowing of reactive power is reduced; factors like geographical position of the photovoltaic array, type of the inverter and optimal working interval are taken into consideration, so that realization of reactive balance is guaranteed while maximization of active power output by the whole station is realized, whole-station optimal adjusting and economical running of the photovoltaic power station are realized, and the reactive phase modulation method has higher engineering application value.

The invention belongs to clamps for testing material mechanical properties, and relates to a three / four-point bending performance test general clamp for a material. The three / four-point bending performance test general clamp provided by the invention helps to improve the three / four-point bending performance test efficiency, and especially helps to substantially improve the four-point bending performance test efficiency. Under the prerequisite of satisfying domestic and foreign test standards, five technical measures are employed for improving the efficiency of test preparation work, and specifically the five technical measures comprise generalizing the clamp, displaying span in digital manner, arranging scale on a bearer and performing bidirectional centering. The general clamp provided by the invention is capable of finishing three / four-point bending performance tests, so that the clamp replacing time is saved. When the three-point bending performance test is carried out, only an appropriate pressure head needs installing after two pressure-head seats of the clamp are in contact.

The invention provides a direct-current microgrid control method and system based on hierarchical management. An overall control strategy of a direct-current microgrid is decomposed into an equipmentmanagement layer and a bus control layer structure. All parts of the microgrid are regulated based on own characteristics and working modes at the equipment management layer; and at a hybrid energy storage effect link, current controlling without energy storage battery compensation is carried out, so that the energy storage adjustment response speed and stability are improved. At the bus control layer, a set working mode controller carries out working mode division according to a fluctuation range of a bus voltage and the residual power of the battery, so that the system is able to carry out switching in different working states; and the working modes of all units of the equipment management layer are set based on different working modes, so that the stable operation capability of the direct-current microgrid is enhanced. And with consideration of the parallel energy storage control method, an adaptive droop coefficient regulator is established, so that the ring current influence between lines is suppressed and the time of reaching balancing of the parallel energy storage is shortened.

The invention relates to an air-oxygen mixed control breathing machine and a control method. The breathing machine comprises an oxygen path, an air path and an oxygen and air mixing chamber. The oxygen path and the air path are connected to the oxygen and air mixing chamber. A gas outlet of the oxygen and air mixing chamber is provided with a gas outlet pressure sensor. An oxygen flow regulating valve, an oxygen flow sensor and an oxygen closure member are arranged on the oxygen path. The oxygen path is further provided with a core controller and a driving circuit. The core controller, the driving circuit, the oxygen flow regulating valve and the oxygen flow sensor are connected in sequence to form a loop. The oxygen flow sensor and the driving circuit can feed back oxygen flow and voltage to the core controller respectively, and a double-closed-loop control system based on flow and voltage feedback can be formed. A draught fan, an air pressure regulating valve, an air flow sensor and an air closure member are arranged on the air path. According to the air-oxygen mixed control breathing machine and the control method, an oxygen valve is controlled through the double-closed-loop control system based on oxygen flow and voltage, the regulating speed is high, and precision is high.

The invention relates to a method for rapidly tuning impedance matching of an antenna tuner. An initial impedance value of matching turning is provided through impedance detection; an optimized threshold value of a matching network is provided through standing-wave ratio detection, and the matching conditions of a circuit are balanced; the matching network is an n-type matching network, a front n capacitor C1 and an inductor L are formed through binary cell arrays, and a fixed value is adopted to a back n capacitor C2; a binary cell array circuit is characterized by 1 being formed by connecting a plurality of branches in parallel, wherein each branch is formed by connecting a switch and a capacitor C in series; 2 being formed by connecting branches in series, wherein each branch is formed by connecting a switch and an inductor L. The method includes the steps of detecting the initial impedance, judging whether the capacitor C2 is connected or not, conducting impedance detection again, calculating the value of the inductor L and the value of the capacitor C1, and judging increased or decreased stepping magnitude according to the impedance deviation degree and the turning frequency band. The method has the advantages of being capable of achieving rapid matching of the input impedance of an antenna, fast in adjusting speed, simple in operation and capable of ensuring the turning speed .

The invention discloses a system adopting square wave to modulate and measure eigen frequency and half-wave voltage of an interferometric fiber-optic gyroscope, wherein a central processor (63) is composed of a demodulation unit (631), a frequency modulation unit (632), an amplitude modulation unit (633) and a direct digital synthesis unit (634); and the demodulation unit (631) is used to (A) extract a demodulation value P(Delta t<+>) of an effective modulation positive half-period Delta t<+>> from received optical power information V1 during a modulation period Delta T, (B) extract a demodulation value P(Delta t<->) of an effective modulation positive half-period Delta t<-> from received optical power information V1 during a modulation period Delta T, (C) average over the demodulation value P(Delta t<+>) of the positive half-period and the demodulation value P(Delta t<->) of the negative half-period to get demodulation average value P(Delta t), and transmit the demodulation average value P(Delta t) to the amplitude modulation unit (633), (D) extract an optical power average value S (Delta t) from received optical power information V1 during a modulation period Delta T and transmit the optical power average value S (Delta t) to the frequency modulation unit (632). The satisfying condition of the modulation frequency fd is 2fe / 5<Fd<8fe / 5, and the satisfying condition of the initial amplitude A0 is Pi / 8<A0< Pi / 2, and the wide range is enough for application in construction.

The invention relates to the technical field of ore grinding control in a concentration plant, in particular to an intelligent hierarchical control method and a control device for ore grinding in a concentration plant. The control method comprises the following program processes: controlling system initialization; judging whether ore feeding quantity control is implemented or not; implementing ore feeding quantity PID control; judging whether ore water feeding control is implemented or not; implementing the ore water feeding control; judging whether ore water discharging control is implemented or not; implementing the ore water discharging control; judging whether cyclone inlet pulp density and water replenishing cascade control is implemented or not; judging whether pump sump liquid level control is implemented or not; implementing the pump sump liquid level control; judging whether the ore grinding process is finished or not; finishing the ore grinding process; judging whether to return or not; and carrying out interconnected control on each processing device. The device comprises an upper computer, a lower computer, a detecting instrument and an executing mechanism. The invention enables the system to have the characteristics of high control accuracy, high regulating speed, strong interference resistance, stability, reliability and the like, accurately regulates the operating parameters in real time, and improves the working efficiency and the product quality of grinding classification.

The invention relates to a focusing method. The method comprises a search and shooting step in which a hill climbing focusing search method is used to adjust a focal length in a stepping mode to carryout multiple times of shooting on a target to acquire multiple first images, a definition calculation step in which multiple definition values of the multiple first images are calculated, a shootingstop step in which shooting is stopped after an extreme value is judged to exist in the definition values of the multiple first images, a parameter acquisition step in which three focal lengths corresponding to three maximum definition values in the definition values of the multiple first images are acquired, and a focal length acquisition step in which the best focal length position for shootingthe target is calculated according to the three maximum definition values of the first images and the three focal lengths corresponding to the three maximum definition values. The invention also provides a focusing system. Compared with the prior art, the focusing method and the focusing system are quicker.

The invention discloses a multi-type energy storage joint planning method based on stochastic fluctuation of new energy. The method comprises the following steps: acquiring multi-type energy storage planning data, system basic technical data, system operation constraint data and system operation prediction data; constructing a joint planning model for determining multi-type energy storage locatingand sizing; and solving the joint planning model to obtain the investment and construction quantity / capacity of energy storage equipment of each node to be selected, the investment and operation costof the construction plan under different abandon new energy risk and new energy absorption rate, as well as the electricity utilization rate and capacity utilization rate, and realizing optimal locating and sizing of the energy storage equipment according to the above data. The multi-type energy storage joint planning method disclosed by the invention has higher economical and energy storage utilization efficiency than a single-type energy storage planning method, and can better meet various requirements of system operation, thereby greatly improving the consumption level of new energy.

The invention discloses a gravity compressed air energy storage system and a working method thereof, and belongs to the technical field of energy storage. The device comprises an air compression unit,an air expansion unit, an air storage chamber, a weight and a generator; the inlet of the air compression unit is connected with an air inlet device, the outlet of the air compression unit is connected with the inlet of the air storage chamber through an energy storage pipeline, the outlet of the air storage chamber is connected with the inlet of the air expansion unit through an energy release pipeline, and the outlet of the air expansion unit is connected with the generator; a heat exchange unit is arranged between the energy storage pipeline and the energy release pipeline; the weight is arranged on the upper part of the air storage chamber and forms a piston-cylinder system with the air storage chamber; and a sealing device is arranged between the weight and the air storage chamber. According to the invention, the compressed air energy storage mode and the gravity energy storage mode are combined, and the advantages of high density of compressed air energy storage and flexible arrangement of gravity energy storage are both achieved, so that the stability of a power grid can be guaranteed, and the functions of peak regulation, frequency modulation, peak clipping and valley filling can be achieved.

An indoor AGV wireless navigation method and a device therefor are disclosed. The method includes collecting in advance indoor overall scene image information including a plurality of marking characteristic points, positioning actual coordinates of the marking characteristic points, building an indoor plane-coordinate system, determining a correlation between the plane-coordinate system and a virtual coordinate system of the scene image information, extracting a safety area of an image according to the scene image information, determining an actual indoor AGV barrier-free travelling safe area according to the correlation between the plane-coordinate system and the virtual coordinate system of the scene image information, detecting present coordinates of an object in real time, and performing route planning in the safe area. The method and the device can automatically recognize route and surrounding environment information, can automatically navigate a vehicle without the need of paving any route information or mark information, and are flexible and free in route planning and high in regulating speed.

An embodiment of the invention discloses a white balance adjusting method, device and terminal. The white balance adjusting method comprises obtaining a frame rate of a first camera; judging whether the frame rate is a maximum frame rate or not and obtaining a first image through the first camera if yes; analyzing the first image to obtain white balance gain of the first image; adjusting white balance on a second image through a second camera through the white balance gain; displaying the second image after white balance adjusting. The white balance adjusting method can improve the white balance adjusting speed and reduce the display delay of the image after white balance adjustment under the condition that the image quality is not influenced.

An embodiment of the invention provides a method and a device for adjusting recommendation lists. The method includes acquiring application download history records of users, computing proportions of game application and non-game application to total downloaded application of the users within a set time on the basis of the application download history records so as to acquire game application preference indexes and non-game application preference indexes, and generating redundancy recommendation lists for the users; adjusting the redundancy recommendation lists on the basis of the computed game application preference indexes and the computed non-game application preference indexes to form final recommendation lists; displaying the final recommendation lists for the users. Distribution of game application and non-game application in the final recommendation lists keeps corresponding to the game application preference indexes and the non-game application preference indexes of the users. The method and the device have the advantage that personalized recommendation can be carried out by the aid of the recommendation lists according to difference of interest and preference of the different users.

A recliner including a power adjustment system operable at a first rate, and at least one sensor including an active material element, wherein the sensor is configured to determine an obstacle to adjustment and selectively retard the rate when the obstacle is determined.

The invention discloses a tube expander, which comprises a machine body. The main points of the technical scheme include: the machine body comprises an underframe; the underframe is provided with a mainframe; the mainframe is provided with a plurality of expanding rods which can slide on the mainframe back and forth; and one end of the mainframe is provided with a clamping device which can clamp the expanding rods, while the other end is provided with a pushing mechanism which can push the expanding rods to slide. The tube expander is characterized in that: a subframe is arranged on the underframe and on the right side of the mainframe; the subframe is provided with a lifting frame and a first driving part which can push the lifting frame to move up and down; the lifting frame is provided with a guide rail; a pipe-fitting mounting frame, which can mount pipe fittings, is loaded on the guide rail; and the lifting frame is provided with a second driving part which can push the pipe-fitting mounting frame to move forward and backward. The tube expander has the advantages of simple structure, convenient operation and high adjusting accuracy.

The invention relates to the field of communication, in particular to a method for estimating and compensating a sampling clock offset and a receiving device. In the invention, a sampling clock offset is estimated and comprehended by two steps. In the first step, the sampling clock offset is sampled according to two synchronous symbols in a time slot and compensated in the next time slot according to an estimating result; and in the second step, the sampling clock offset of every two adjacent data symbols in the time slot is finely estimated by utilizing the continuous pilot frequency symmetry of the data symbols and the sampling clock offset of the currently received data symbols is compensated according to a current estimating result after the sampling clock offset of every two adjacent data symbols is estimated every time. By the invention, the adjusting speed is greatly improved, and the system can rapidly enter a stable state.

The invention relates to a power scheduling operation method, in particular to a wind-fire-water co-scheduling method on the basis of a multi-agent system. The method solves the problem that a conventional power scheduling operation method cannot meet the requirement on the large-scale wind power grid-connected operation. The wind-fire-water co-scheduling method on the basis of the multi-agent system is implemented by adopting the following steps of: 1, constructing a wind-fire-water co-scheduling model on the basis of the multi-agent in a scheduling Agent; 2, acquiring predicted data of a load demand in a power system by a load Agent in the power system; 3, sending acquired basic data and real-time data into the wind-fire-water co-scheduling model on the basis of the multi-agent by each thermal power Agent; and 4, issuing and executing a scheduling command by each thermal power Agent and a hydroelectric Agent. The wind-fire-water co-scheduling method is suitable for large-scale wind power grid-connected operation scheduling.

The invention relates to an unmanned patrol aircraft for power transmission lines. The unmanned patrol aircraft comprises an aircraft body, a camera system, a cloud deck, a nanometer battery, an aircraft control system, a wireless transmission system, a GPS positioning system and a ground receiving, controlling and managing system. The unmanned patrol aircraft has four ailerons which are symmetrically installed at two sides of a main beam; the unmanned patrol aircraft has the advantages of stable flight, a fast flight speed, high flexibility and great loading capacity; front and rear beams are of segmented design, which facilitates adjustment and wiring. The aileron horns of the ailerons are movably connected with an aileron fixing frame through bolts; the aileron fixing frame is equipped with folding positioning seats; the aileron horns rotate with the bolts as centers and are limited through the folding positioning seats; such a structure enables the aileron horns to be parallely drawn close onto the main beam after folding, so the unmanned patrol aircraft has a small size and is easy to carry. After the front and rear aileron horns are open, lines among center points of four motors on the front and rear aileron horns form a square, and such a structure enables the aircraft to maintain balanced flight and to have reduced current loss and long flying time.

The invention discloses a movable-type static synchronous compensator with a compact structure design. The compensator has high compensation capacity and rapid adjusting speed and compact structure, is convenient for transportation, and can be rapidly transferred, installed and put into operation at the urgent place needs reactive power support, thus the planning, the arrangement and the operation of a dynamic reactive power compensation device of a power grid are more flexible and effective. The movable-type static synchronous compensator comprises three functional module containers with the same structure, an auxiliary equipment container and a movable base, wherein, the functional module container comprises a single-phase converter chain and a converter chain arrester; the auxiliary equipment container comprises a control protective system, a water-cooling system and a three-phase starting loop; and the movable base comprises a connection reactor, a main breaker, an isolation switch and an earthed switch. The compensator provided by the invention has the obvious advantages of rapid response speed, wide adjustment application, low harmonic output content, adoption of compact design, mobility, less occupation area and the like.

The invention relates to a blast furnace gas dry cloth-bag dust-removing device and technology, belonging to the metallurgy environmental protection dust removing technical field. The blast furnace gas dry cloth-bag dust-removing device and technology mainly comprise devices such as a dust-removing filtering device, an ash-clearing device, a dust-unloading and transporting device, an automatic control device, a gas dispersion device, and technologies such as large filtering wind speed, nitrogen or pure coal gas pulse current back-blowing and ash-clearing, pneumatic unloading and transporting ash and backup for nitrogen and pure coal gas, wherein, coal gas is filtered and purified by a filtering bag, the ash is back-blown by nitrogen or pure coal gas pulse current so as to control the resistance of the dust remover, thereby the filtering bag has the ideal dust removing effect, which is a dry dust-removing purification system having the advantages of high dust-removing efficiency, low dust content of the pure coal gas, low energy consumption of the dust-removing system, high heat efficiency of the pure coal gas and high automation degree; the filtering bag with over-long specification and a biserial pulse back-blowing system are adopted to meet the requirements of the dust-removing system upon a large filtering area and an excellent back-blowing efficiency; a crude gas bleeding valve group is increased to ensure that the coal gas with overproof temperature can not enter to a case of the dust remover, which protects the cloth-bag, controls effectively the high furnace roof pressure and operates the system more safer; the whole course waterless operation is realized so as to prevent the possibility of water containing coal gas dust to paste the filtering bag, thereby having the characteristics of less occupied area, short technology process, strong ability of clearing the ash, simple equipment and low labor intensity.

The invention aims at providing a method for simply designing a McPherson suspension. The method comprises the following steps: firstly, establishing a coordinate system; then, obtaining hard point position parameters of connecting positions of each component in the McPherson suspension such as the shock absorber upper point, the tire grounding point, the control arm outer point and the control arm front point or back point and the like through measurement or calculation; carrying out calculation according to the parameters to obtain an equation of a main pin axial line and a control arm axial line; calculating the coordinates of an instantaneous rotation center through setting a first auxiliary line on the basis; and then, calculating the side inclination center height through setting a second auxiliary line. Thereby, the hard point positions of the connecting positions of each component in the McPherson suspension can be regulated according to the design requirements, and the side inclination center height of the McPherson suspension can be regulated. The method for designing the McPherson suspension of the invention has the characteristics of low threshold, convenience, accuracy and the like, is suitable for being used in the development work of the McPherson suspension, and can improve the developing speed.

It is difficult to implement a conventional phase lock loop circuit in a sink device within an HDMI system because the low frequency input causes the conventional phase lock loop circuit to absorb unnecessary noise during a long waiting period. Therefore, the present invention provides a low jitter clock regenerator comprises: an input clock; a divider to divide said input clock into a slower clock; a phase lock loop circuit to regenerate said slower clock to a reference clock; and a parameter transformer to tune said divider and said phase lock loop circuit to increase the adjustment speed of said phase lock loop circuit. The present invention also provides a method to reorganize parameters in order to create new parameters which are better suitable for a clock recovery circuit in a sink device within an HDMI system.

The invention discloses a self-adaptive fast power voltage regulation system. Two regulation strategies of dynamic voltage and frequency scaling (DVFS) and self-adaptive voltage scaling (AVS) are combined together, and are respectively achieved by two parts of DVFS fast coarse scaling and relatively slow AVS fine scaling. The system is characterized by comprising a main circuit system platform, a frequency regulator lock phase-locked loop RLL, an output power rail line PMOS switch block, an off-chip power management chip PMIC, a performance decision module, an on-chip hardware performance monitoring module, an on-chip DVFS control module and an on-chip AVS control module. According to the method and the self-adaptive fast power voltage regulation system, the working voltage and frequency of a chip are reduced at the same time, the margin of chip voltage is reduced, the influence of fast voltage changes is compensated, and the power consumption spending of the chip is reduced.

The invention discloses a level adjusting device and a method thereof. The level adjusting device includes a support plane, an execution mechanism and a control unit. The execution mechanism and the control unit are located below the support plane respectively. The execution mechanism includes a fixing support foot and two shear-type jacking driving devices. The level adjusting device adopts a PD closed-loop control algorithm to use a parameter obtained by an inclination-angle sensor as a feedback of driving of the execution mechanism by an embedded-type controller so that the level can be adjusted rapidly and accurately and the shear-type jacks are used as the execution mechanism and through reduction gearboxes, stepping motors drive lead screws of the shear-type jacks to rotate so as to adjust the ascending and descending of the support foot. The level adjusting device and the method thereof have the characteristics of being high in adjustment speed, high in adjustment precision and great in bearing performance; and the level adjusting device is simple and compact in structure, high in stability and wide in practicality.

A CT machine is composed of radioactive source, detector system, machine frame, rotary plate and rotary axle, and is characterized by its additional intelligent beam limiter for regualting the central position and width of sectorial ray beam. Said beam limiter consists of the intelligent controller composed of servo controller, servo unit, servo motor, position detector, angle encoder, and zero-position signalling unit, and the mechanical transmission mechanism. Its advantages are low radiant energy, high scan speed and high clearness of image.