102results about How to "Large loading range" patented technology

The invention puts forward a bidirectional DC-DC converter for high voltages that is as simple as possible and that entails as few losses as possible. The bidirectional DC-DC converter (1) converter comprises an input stage (2) to convert a DC input voltage into first AC voltage, a transformer (3) to transform the first AC voltage into a second AC voltage, and an output stage (4) to convert the second AC voltage into a DC output voltage, whereby, in order to provide the first and / or second AC voltage, at least one of the input stages (2) and / or output stages (4) comprises a branch of a multi-level converter (5) with a first number of active first semiconductor switches (61).

The invention discloses a magnetic attraction type wall-climbing robot which comprises a frame, wheels, motors, a strong magnetic block set, a power source, an upper supporting plate, a lower supporting plate and supports. The motors are arranged on the supports located on the bottom face of the frame. The motors are connected with the wheels. The strong magnetic block set is connected to the bottom of the frame through cooperation of screws and nuts. The upper supporting plate is provided with a drive system, the lower supporting plate is provided with a control system, and the control system is connected with the drive system. The drive system is connected with the motors. A wheel type structure is adopted by the magnetic attraction type wall-climbing robot, so that movement flexibility is good, strong magnetic blocks are used for magnetic attraction, loading capacity is high, the distance between the strong magnetic block set and a magnetic conductive surface is adjustable, and the loading range is wide. The magnetic attraction type wall-climbing robot is simple in structure, low in manufacturing cost, and capable of being widely applied to cleaning, coating, detecting and other operations on pipelines, storage tanks and other working conditions.

The invention discloses a fatigue loading device for a reinforced concrete duration test, which comprises a touch screen, a controller, an electric hydraulic pump, an electromagnetic reversing value and a loading component; a hydraulic jack is fixed on the inner side of a baffle of the loading component and a pressure sensor is fixed on the inner side of the other baffle, a plurality of parallel sliding plates capable of sliding and a specimen box consisting of a backing plate with four points being bent and a rubber box are arranged between the two baffles, and specimens are arranged in the specimen box; the touch screen, the controller, the pressure sensor, the electric hydraulic pump and the electromagnetic reversing valve are connected through data cables; and the hydraulic jack is communicated with the electromagnetic reversing valve and the electric hydraulic valve through pipelines. The device can simulate the real working condition that in an actual project, fatigue load, chemical corrosion, dry and wet cycles or freezing-thawing cycles jointly act on concrete components, so that the data obtained by a laboratory has a higher reference value to projects.

The invention discloses a high-effect dry friction damping spring vibration isolator and aims at providing a friction damping vibration isolator which is compact in structure, large in friction damp, high in load and good in environmental adaptation. According to the technical scheme, in a vibration environment, left friction pieces and right friction pieces of a disc-pressing upper cone spring (3) and a disc-pressing lower cone spring (6) perform reciprocating motion to axially extrude a right friction ring piece (4) and a left friction ring piece (9) on two sides, the left friction ring piece, the right friction ring piece, an upper guide umbrella disc (1) and a lower guide umbrella disc (5) are driven to perform constant friction motion on the inner wall of a housing (2), vibration mechanical energy is converted into heat energy so as to achieve vibration energy consumption and reduction. The high-effect dry friction damping spring vibration isolator utilizes low frequency of a conical spring and a damping characteristic of a symmetric semi-ring damping pad, can effectively inhibit spring fluctuation during high-frequency impact, also has composite multiple vibration isolation effect and has large damp under the low-frequency condition compared with a traditional rubber vibration isolator.

The invention, which belongs to the field of precise scientific instruments, relates to a material mechanical property in-situ test instrument and method under a high-temperature complex mechanical load. A support frame module of the instrument is used for realizing stable support and effective vibration isolation of each functional module of the instrument. A high-frequency fatigue loading moduleis used for realizing high-frequency fatigue loading of a tested sample. A static and dynamic mechanical load loading module is used for realizing combined loading of static and dynamic stretching / compressing / bending loads of the tested sample. A high / low-temperature loading module is used for realizing variable temperature environment loading on the tested sample from a low temperature to a hightemperature. An in-situ monitoring module can integrate a surface deformation damage measurement assembly, a three-dimensional strain measurement assembly, a microstructure measurement assembly and an internal damage detection assembly according to actual test requirements to realize parallel accurate in-situ measurement of a micromechanics behavior, a deformation damage mode and a performance evolution law of the tested sample. The material mechanical property in-situ test instrument and method have advantages of complex load environment, rich test content, high measurement precision and thelike.

The present invention provides a pressure sensor and a method of manufacturing the same, which can change resistance to load smoothly in a relatively small load range and detect the pressure to the extent of relatively large load range. An uneven layer 6 is formed of a resin containing non-conductive particles 6a and having insulation properties, on a surface of the second substrate 3, and a resistor layer 7 containing at least carbon powder and having a certain film thickness is formed on a surface of the uneven layer 6. A sum of a film thickness of the uneven layer 6 between the non-conductive particles 6a and a film thickness of the resistor layer 7 is smaller than a particle diameter of non-conductive particles 6a included in the uneven layer, and at least a resistor layer 7 is formed on the non-conductive particles 6a and between the non-conductive particles 6a.

The invention discloses an elastic load application device for a steering engine. The elastic load application device for the steering engine comprises a table-type stage installation platform formed by a support combination, uprights and an installation board. A guide board is fixed to the installation board through a plurality of screws. An installation frame, an installation disc and a support are sequentially clamped to the installation board through screws along the guide board. The steering engine is fixedly assembled on the installation frame. One end of a torsion bar is clamped to a clamping groove in the top end of the support. A pressing board is symmetrically arranged on the support through two screws at the upper end of the clamping groove, an output shaft of a torque sensor is clamped to the other end of the clamping groove, and effective clamping is achieved. The elastic loading torque of the elastic load application device for the steering engine is adjustable, the elastic load application device for the steering engine can be used for elastic load application of various steering engines with different output torques, and the elastic load application device for the steering engine has the advantages of being high in loading accuracy, large in load range, simple and effective in the clamping process, convenient to use, high in loading speed, high in reliability and the like.

The invention belongs to the field of scientific experiments of materials and particularly relates to a pressure application test device and test method for a reinforced concrete sample in a salt-spray environment. The test device comprises a bearing platform, a salt-spray environment cabinet, a jack and a pressure sensor, wherein a bearing reaction frame and a loaded reaction frame are arranged at two ends of the bearing platform respectively, and the salt-spray environment cabinet is arranged in the middle of the bearing platform; the jack is fixed on the bearing reaction frame, and the pressure sensor is fixed on the loaded reaction frame; the reinforced concrete sample is placed in the salt-spray environment cabinet, the salt-spray environment cabinet provides the reinforced concrete sample with a salt-spray environment required by an experiment, the jack loads the reinforced concrete sample, and the pressure sensor measures the load value borne by reinforced concrete. The test device can apply a pressure load to the reinforced concrete sample in the salt-spray environment, the load range is wide, the load value can be adjusted freely in an experiment process, little salt spray leaks in load applying and maintaining processes, test data are accurate, the data can be read at any time, and the service life is long.

The invention belongs to the field of material scientific experiments, and concretely relates to a bend test apparatus for a reinforced concrete test piece in salt-spray environment. The test apparatus comprises a bearing platform, a salt-spray environment box, a jack and a pressure sensor; two ends of the bearing platform are respectively provided with a support reaction frame and a bearing reaction frame, and the middle part of the bearing platform is provided with the salt-spray environment box; the jack is fixedly disposed on the support reaction frame, and the pressure sensor is fixedly disposed on the bearing reaction frame; the reinforced concrete test piece is put in the salt-spray environment box, and the salt-spray environment box is used to provide the salt-spray environment demanded by the test on the reinforced concrete test piece, the jack applies bending load on the reinforced concrete test piece, and the pressure sensor measures the load value born by the reinforced concrete test piece. The apparatus is capable of applying the bending load on the reinforced concrete test piece in the salt-spray environment, and is large in loading measuring range. The load value during experiment can be freely adjusted, salt-spray leakage is small in the process of applying and maintaining the load, measure data is precise, data can be read momentarily, and the service life of the apparatus is long.

A life-saving apparatus for high building is composed of a drive system consisting of steel cable, reel, low-speed and high-speed axles and bearings, a speed stabilizing system consisting of DC generator and magnetic powder brake, a cable rewind system consisting of rockerarm, overriding clutch, cable reel, etc, a fixing system consisting of base, guide roller, pulley, safety belt, etc. and dual-circuit control system consisting of control switch, circuits, power supply, accumulator and emergency lamp.

The invention discloses a high-frequency pulse discharge assisted surface rolling strengthening processing device. The high-frequency pulse discharge assisted surface rolling strengthening processing device is composed of a rolling mechanism, a force measuring mechanism and a pulse discharge mechanism; the rolling mechanism comprises a sleeve with a rolling rod, and a rolling wheel is arranged at the end of the rolling rod; a pressure sensor, a supporting plate and a spring of the force measuring mechanism are sequentially arranged at the rear end of the rolling rod in the sleeve and are fixed through an end cover; a pressure display instrument of the force measuring mechanism is connected with the pressure sensor through a data line; the pulse discharge mechanism is a high-frequency pulse power source connected with a work electrode; and a cooling nozzle is formed in one side of the rolling wheel. The invention further discloses a high-frequency pulse discharge assisted surface rolling strengthening processing method. On the basis of surface rolling processing, the high-frequency pulse discharge is introduced into the surface rolling processing process, and through combination of surface rolling and high-frequency pulse discharge, a strengthening layer which is good in performance and uniform in structure is obtained from the surface of a workpiece, and wear-resisting performance and anti-fatigue performance of a part are improved.

The invention relates to a simulation load balancing method and device for aircraft engine crankcase strength tests. According to the method, X-axis force, symmetrical torque force, Y-axis lateral force and Z-axis lateral force are provided for different positions of a crankcase through a servo oil cylinder, and thus the stress conditions of the crankcase are synthesized. The method is reliably verified due to the fact that the device is provided with the servo oil cylinder, an annular outer pipe, an annular inner pipe, an annular piston, a pull rod, an inner pressing plate and an outer pressing plate. With the simulation load balancing method and device for aircraft engine crankcase strength tests, the stress conditions of the crankcase can be effectively simulated, the simulated loaded load range is wide, and thus the requirements of high-strength tests are met.

A thin tube dedicated fixture under action of an axial and internal pressure composite load includes a front clamping mechanism and a rear clamping mechanism; the front clamping mechanism is connected with a detected thin-walled circular pipe through a front flange and is used for clamping a front port of the detected thin-walled circular pipe and introducing hydraulic oil or air pressure to the detected thin-walled circular pipe; the rear clamping mechanism is connected with the detected thin-walled circular pipe through a rear flange and is used for clamping a rear port of the detected thin-walled circular pipe and ensuring that a hydraulic oil outlet end of the detected thin-walled circular pipe is sealed in a testing state. A flange fastening structure more convenient to dismount, mount and replace is used for replacing, so the fixture has the advantages of more reasonable design, simple assembly structure, and easy testing and operation, avoids influence of welded joint crack damage, nonperpendicularity and other factors in an experimental process, prevents pulling and disengaging, and has large deadweight range. The fixture has good sealing, does not need to consider potential risks brought due to the leakage of hydraulic oil. The whole fixture assembly structure stability is extremely strong, and an ideal effect is obtained through multiple times of experimental verifications.

The invention discloses an excitation road deflection tester, which belongs to the field of testing road deflection, the structure of the invention comprises a guide bar, a heavy hammer, a release mechanism, a load transfer mechanism, a level transfer frame, a center displacement sensor, an auxiliary displacement sensor and a load sensor, and is characterized in that a detonative power generative mechanism is arranged on the upper side of the load transfer mechanism, and the initiation of the detonative power generative mechanism is achieved through the impact of the heavy hammer. Compared with the prior art, the excitation road deflection tester of the invention has the characteristics of flexible moving, big loading force range and convenient using and the like, is capable of being widely used to test the road deflection indexes, and is also capable of being used to test the indexes of non-deform ability of reaction structures which are the subgrade resilient modulus and the like.

The proposed invention relates to a gas / liquid contacting vessel (100) for treatment of a gas stream at varying mass flow rates, said vessel comprising at least two distinct gas / liquid contacting compartments (101a, 101b) separated from each other by a substantially vertical partition (102), each compartment having a gas inlet (104a, 104b) and a liquid outlet (110a, 110b) near a bottom end thereof and a gas outlet (106a, 106b) and a liquid inlet (108a, 108b) near a top end thereof, and a mass transfer device (111a, 111b) arranged between said bottom end and top end, wherein one of said compartments is operable for gas / liquid contacting independently of another of said compartments. The proposed invention further relates to a flue gas treatment system for removal of carbon dioxide (CO2) from a flue gas using a liquid absorbent and to a power plant comprising such a gas / liquid contacting vessel or flue gas treatment system.

The invention relates to the technical field of unmanned aerial vehicles, in particular to a combination type transportation unmanned aerial vehicle. The combination type transportation unmanned aerial vehicle has the characteristics that the combination type transportation unmanned aerial vehicle comprises a plurality of modularized unmanned aerial vehicles, an unmanned aerial vehicle mounting platform and mounting interfaces; each modularized unmanned aerial vehicle consists of an unmanned aerial vehicle main body and an unmanned aerial vehicle mounting tenon; each unmanned aerial vehicle main body is fixedly mounted on the unmanned aerial vehicle mounting platform through the corresponding unmanned aerial vehicle mounting tenon and the corresponding mounting interface; the unmanned aerial vehicle mounting platform consists of an unmanned aerial vehicle mounting frame, undercarriages, cargo hanging frames, a central controller and a power / data transmission lines; the central controller, the cargo hanging frames and the undercarriages are arranged below the unmanned aerial vehicle mounting frame; the plurality of modularized unmanned aerial vehicles are connected with one anotherthrough the power / data transmission lines and are connected with the central controller. By changing the number and layout of the combined unmanned aerial vehicles, the transportation requirement of different volume mass loads can be met, and the load range of a transportation unmanned aerial vehicle is expanded; the cruising capacity is enhanced; rapid disassembling and assembling of unmanned aerial vehicle modules is realized; the safety and the adaptability of the unmanned aerial vehicle are enhanced.

The present disclosure relates to a sealed constant force generation system utilizing a spring system comprising a spring system housing unit, spacers, interchangeable spring load rod and conical spring washers, a puller assembly comprising a puller, pivot assembly, seal system and o-ring, a lever arm system, an adjustment system, a load stopper and fulcrum housing unit. A method for applying the sealed constant force generation system on objects or loads experiencing a specific displacement is also disclosed.

The invention provides an aerodynamic electromagnetic simulation test device. The aerodynamic electromagnetic simulation test device comprises an electrifying solenoid, a model fixing device, a loading snap ring, a power switch and a programmable power supply; the electrifying solenoid which is in a hollow cylindrical shape is used for generating axial uniform magnetic fields with identical magnetic induction line directions; the model fixing device which is arranged at one end of the electrifying solenoid is used for fixing a test model within a hollow range of the electrifying solenoid; the loading snap ring comprises a snap ring and a lead; the snap ring is a concave groove which is made of non-conducting materials and can be snapped under the test model; a plurality of leads pave inside the concave groove in a parallel mode; the directions of the leads are perpendicular to those of the magnetic induction lines; every lead is divided into a transverse lead section which paves on the bottom surface of the concave groove and a vertical lead section which paves along the concave groove wall; the leads are connected with the programmable power supply through the power switch after being in parallel connection. The aerodynamic electromagnetic simulation test device achieves real simulation of dynamic aerodynamic loads of an aircraft through Ampere force.

The invention provides a measurement system and method for dynamic sliding friction coefficients. The system comprises a parameter loading system, a power supply device connected with the input terminal of the parameter loading system, a sensor signal reading system connected with the output terminal of the parameter loading system, and a data processing system connected with the sensor signal reading system 3. The system and the method solve the technical problems of strict experiment requirements, less measured coefficients and narrow sliding velocity load range in the existing measurement system and method for sliding friction coefficients. The system and the method have the advantages that the change rule of sliding friction coefficients along with load, sliding velocity, rough pavement, rubber property and temperature can be tested, and the continuous loading and keeping of vertical load, sliding velocity and temperature are realized.

The invention discloses a multi-chamber type steel pipe and concrete combined T-shaped column which consists of square and rectangular steel pipe profiles and concrete poured into the steel pipe profiles, wherein three or more rectangular steel pipe profiles are welded together to form a T-shaped sectional column; the whole section of the column is divided into multiple chambers through the three or more steel pipe profiles; and then the concrete is filled into the chambers. The steel pipes are the square and rectangular steel pipe profiles. Due to the multiple chambers, the mutual action of the steel pipes and the concrete is enhanced, the proportional limit of the height to thickness ratio of a flange to a web plate increases, and an application range of a load is enlarged; a 90-degree internal corner is eliminated, so that the bearing capacity of a structural piece is improved, and the seismic performance of the T-shaped column is improved; the welding work is less, and the T-shaped column is easy to manufacture and high in economical benefit; and the initial shortcomings of cold bending and welding of common steel plates are overcome, and therefore, the T-shaped column is more ideal in stress.

The invention discloses an air damper used for a motorcycle. The air damper comprises a first installation ring connected with a motorcycle axle and a second installation ring connected with a motorcycle frame. The first installation ring is connected with a connecting rod. The connecting rod is connected with a piston. The piston is installed in a hydraulic barrel connected with the second installation ring. A second limiting block is connected to the outer wall of the end, close to the second installation ring, of the hydraulic barrel. A first limiting block is arranged on the connecting rod. A spring is arranged between the first limiting block and the second limiting block. Metal pipes communicating with an inner cavity of the hydraulic barrel are connected to the end surface of the end, close to the second installation ring, of the hydraulic barrel. Gas cylinders are connected to the other ends of the metal pipes. According to the air damper used for the motorcycle, the spring and compressed air simultaneously achieve a damping function, the load range which can be met by damping is large, and the adaptive capacity is good; and meanwhile, the compressed air has a better linear damping effect and a higher comfort degree.

An arrangement and a method for controlling a combustion engine, e.g. of the type called HCCI engine. A control unit for controlling the self-ignition of the fuel mixture towards an optimum crankshaft angel (cadiopt) within a load range (Ltot). The load range (Ltot) can be divided into at least two subranges (LI, LII) and the control unit is adapted to controlling the self-ignition of the fuel mixture towards an optimum crankshaft angle (cadiopt) within a first subrange (LI) by means of a strategy (I) which entails a variable amount of hot exhaust gases being supplied to or retained in the combustion chamber, and within a second subrange (LII) by means of another strategy (II) which entails the effective compression ratio (c) in the cylinder being varied.

The invention discloses a frequency conversion control method for a combined single-inductor double-output switching converter. A follow current reference value is dynamically adjusted according to the magnitude of a load current, dynamic follow current of the converter is realized, and meanwhile, the switching loss and conduction loss of a follow current switching tube are reduced by adopting a mode of combining an inductive current continuous conduction mode and a pseudo continuous conduction mode. The invention further discloses a frequency conversion control device for a combined single-inductor double-output switching converter. The method and the device have the advantages of good stability, high reliability, strong anti-interference capability, high load transient response speed, high efficiency and the like while keeping small cross influence among output branches, and can be used for controlling various converters of a single-inductor double-output topological structure.

The invention discloses a device and a method for testing mechanical parameters of bumping diffusion process of a bridge asphalt pavement, aiming at precisely testing the relationship of bumping deformation characteristic parameters of bridge pavement material and applied load, and calculating the interfacial fracture performance and destructive strain of bumps of different pavement systems. According to the technical scheme, the device comprises an environment box arranged on a support frame, wherein a test piece fixing mount is arranged in the environment box, and is connected to a pressurized oil cylinder through an output oil pipe, the pressurized oil cylinder is connected with an MTS fatigue testing machine and can press hydraulic oil into a test piece to generate load action; and a temperature and humidity sensor and a temperature and humidity generation controller are arranged in the environment box, and a camera capable of photographing the surface bumping deformation of the test piece is arranged at the top of the environment box, and is connected to an MTI-3D structural deformation measurement system capable of processing and analyzing the surface bumping deformation of the test piece.

The invention provides a microsphere probe preparation method based on micro-cantilever transfer, and belongs to the technical field of micro-nano manufacturing. The preparation method is simple in process and low in cost, and can be used for preparing the microsphere probe for testing micro-nano processing or indentation mechanical properties and the like; flexible bonding of any granular material can be realized, and any granular material can be randomly matched with any receptor platform; the cantilever can serve as a transfer layer while transferring the microspheres, so that the contact area of the microspheres and the receptor platform is increased, and the contact pressure is further reduced to reduce the deformation of the receptor platform; accurate positioning of the microspheresat the tip of the receptor in the probe preparation process can be achieved through the micro-cantilever, and the situation that the small-size microspheres are completely soaked into glue and pollute the surface of the microsphere probe in the bonding process can be avoided.

The present disclosure relates to a sealed constant force generation system utilizing a spring system comprising a spring system housing unit, spacers, interchangeable spring load rod and conical spring washers, a puller assembly comprising a puller, pivot assembly, seal system and o-ring, a lever arm system, an adjustment system, a load stopper and fulcrum housing unit. A method for applying the sealed constant force generation system on objects or loads experiencing a specific displacement is also disclosed.

The invention relates to an elastic wave foil type cylindrical surface air film flexible supporting structure, and belongs to the technical field of non-contact mechanical sealing. The structure comprises an outer supporting shaft sleeve, a flat plate, a corrugated foil, a static ring, a moving ring rotor and a pressing block, a groove is formed in the moving ring rotor, the static ring is eccentrically installed on the moving ring rotor, the outer supporting shaft sleeve and the static ring are coaxially installed on an external structure, a clamping groove is formed in the circumferential inner wall of the outer supporting shaft sleeve, an arc plate is arranged on the corrugated foil, the arc plate is located on the inner circumferential wall of the outer supporting shaft sleeve, the flat plate is installed on one side in the clamping groove, the corrugated foil is tightly attached to the flat plate and installed in the clamping groove, and the pressing block is pressed into the other side in the clamping groove. According to the structure, the large load can be borne, and uniform structural rigidity can be borne; the supporting performance of the sealing structure can be improved by adjusting the number of the corrugated foils and parameters of the corrugated foils; the flexible supporting and buffering effect and the heat transfer performance of the sealing structure can be improved by adjusting the porosity degree of holes wound by steel wires of the flat plate and the arc plate.

The invention provides an electromagnetic loading device and a loading method used for reliability testing of a numerically-controlled machine tool. The electromagnetic loading device comprises a bottom plate, a motor installed on the bottom plate through a motor support seat, a loading unit connected to a motor main shaft of the motor, and a detecting unit connected to the loading unit. The loading unit comprises a load disk and an electromagnet. The load disk is coaxially connected to an output end of the motor main shaft. The electromagnet is installed below the load disk. A certain air gap is arranged between an end surface of the electromagnet and a circumferential wall surface of the load disk. The detection unit includes an S-type force sensor for detecting a load applied to the motor main shaft and a data acquisition unit which is electrically connected or forms signal connection with the S-type force sensor. In the invention, an electromagnetic principle is used, the load disk is placed in a magnetic field generated by the electromagnet to form an electromagnetic force, a working load received by the motor main shaft under an actual working condition is simulated, a loading effect is good, a loading range is wide, and there is no friction, small vibration and convenient control during a loading process.