2726 results about "Bridge type" patented technology

The invention discloses a small high-speed five-axis linkage machine tool, which comprises a foundation structure, a spindle box component and a cradle type worktable. The spindle box component is supported on the foundation structure, and a crossbeam with a frame-shaped structure is arranged on two upright columns to form a bridge-type portal structure. The torque bearing capacity of the crossbeam is improved, the small high-speed five-axis linkage machine tool has all advantages of a five-axis linkage machine tool in the prior art, and carries identical machining reacting force, the volume of a structural part is reduced, and the weight of the structural part is greatly lightened; a spindle box is positioned between two transverse rods of the frame-shaped crossbeam, overturning moment is eliminated, and the stability of the machine tool can be guaranteed; in addition, sizes of various components are greatly reduced on the premise of identical machining capacity, and the stroke of the machine tool can be large in the design; and by the aid of the structure, the machining precision is greatly improved, the machining range is greatly expanded, better dynamic characteristics and higher feeding speed and higher cutting speed can be realized, cutting and machining time is greatly shortened, better surface machining quality is obtained, and machining efficiency is enhanced.

The invention discloses a system and a method for detecting insulation of an electric automobile DC charging pile, and belongs to the field of electric automobile charging piles. The system comprises a bridge-type impedance network, a voltage conditioning circuit, an isolation unit, an A / D sampling unit, a main control unit, a communication unit and a fault alarm unit, wherein the bridge-type impedance network is used for detecting voltage information of the DC charging pile, and the voltage information is processed sequentially through the voltage conditioning circuit, the isolation unit and the A / D sampling unit and then sent to the main control unit; the main control unit calculates the voltage information processed by the A / D sampling unit so as to acquire a positive bus ground insulation resistance value and a negative bus ground insulation resistance value of the DC charging pile, the main control unit controls the fault alarm unit to alarm on the one hand, and on the other hand, the main control unit sends a calculated resistance value to an electric automobile DC charging pile control system through the communication unit. The system and the method disclosed by the invention are simple in circuit structure, reliable, high in precision, high in anti-interference ability and capable of effectively carrying out insulation detection on the electric automobile DC charging pile.

The invention discloses a total bridge type MMC (Microsoft Management Console)-HVDC (High Voltage Direct Current Transmission) sub-module fault in-situ diagnosing and protecting method, belonging to the technical field of power transmission and distribution. According to the technical scheme, the method comprises the following steps: realizing fault in-situ diagnosis through an electric amount and a communication state of a monitoring sub-module, and transmitting a fault signal to a valve base controller (VBC); then locking a fault sub module through a sub module controller (SMC), and triggering a bypass fault sub module of a bypass device, so that the fault sub module and the system can be protected. The invention provides the total bridge type MMC-HVDC sub-module fault in-situ diagnosing and protecting method, which can be used for monitoring the state of the sub module in real time, and protect the system and the fault sub module after the sub module has a fault, and provides a method capable of keeping the system to stably operate when a signal transmission channel is caused by the fault of the superior controller of the communication fault or sub module controller (SMC).

The invention provides a network voltage disturbance generating device, which comprises a three-phase bridge type PWM (Pulse Width Modulation) rectifier and a three-H-bridge three-phase four-wire-system PWM inverter, wherein the alternating current side of the rectifier is connected with an electric network through an L type filter; the direct current side of the rectifier is connected in series with the direct current side of the three-H-bridge three-phase four-wire-system PWM inverter; an LC filter is connected to the alternating current side of the three-H-bridge three-phase four-wire-system PWM inverter; the output end of the LC filter is connected with an isolation transformer; and the secondary side of the isolation transformer is connected with a load. The invention further provides a control method suitable for the device. Due to the adoption of the device provided by the invention, the simulation of a network voltage amplitude, frequency disturbance and an electric network harmonic phenomenon can be realized, bilateral flow of energy can be realized, and active energy transmitted by tested solar-powered grid-connected equipment is fed back to the electric network; and the control method is easy and convenient to implement, and a target reference value can be accurately tracked; and moreover, quick response and small steady-state errors are realized, so that electric network disturbance can be simulated accurately.

The invention relates to a photovoltaic high-frequency isolation boost soft switch DC / DC converter and a control method thereof, which is used for solving the problems of difficult current conversion of leading leg in idle load or light load and low efficiency in full load, improving the efficiency of the converter and realizing full-power converter. The photovoltaic high-frequency isolation boost soft switch DC / DC converter comprises a high-frequency transformer, wherein the primary side of the high-frequency transformer is provided with a phase shift PWM (pulse-width modulation) control converter; the high-frequency transformer is provided with three secondary sides; two secondary sides are formed by connecting bridge type diode rectification circuits in series for outputting high voltages, the output ends of the secondary sides are connected with output voltage and current sampling circuits, and the output voltage and current sampling circuits are connected with a controller; the third secondary side is formed by connecting a voltage dropping winding with a current converting inductor and a switch in series; the primary side of the transformer is provided with a blocking capacitor Cb and a saturation inductor LS which are connected in series; output filtering capacitors Lfl and Lf2 are coupling capacitors and share one magnetic core; output ends Df1-R1-Cf1 and Df2-R2-Cf2 form a crossed clamping buffer circuit; and the asymmetrical phase shift PWM controller controls power switching devices VT1 to VT4 and a switch K0.

The invention provides a cascade megawatt photovoltaic grid-connected inverter, wherein a topology structure of the cascade megawatt photovoltaic grid-connected inverter is composed of two levels, namely a DC / DC (direct current / direct current) isolation level and a DC / AC (direct current / alternating current) output level; the structures of three phases of circuits are the same; the output ends of a power inverter group of each single-phase of DC / DC output level are connected in a star shape; the input sides of power units of each single-phase level are provided with independent PV (photovoltaic) modules of the same structure; the DC / DC isolation level comprises high-frequency DC / AC, a high-frequency transformer and high-frequency AC / DC nodes of each single-phase for realizing isolation and boosting, and reducing the consumption of a switch tube via action of a resonant soft switch; the output level power transformer set adopts a bridge type inverter circuit; and the single-phase output level power units are connected with each other in a cascade mode. Based output cascade, the device can realize megawatt grid connection; as a high-frequency chain technology is used, the traditional low frequency transformer is omitted, and the power density is high; and compared with the existing photovoltaic grid-connected inverter structure, the device provided by the invention has the advantages of high energy conversion efficiency, excellent output energy quality, certain fault-tolerant capability and the like.

The invention discloses audible noise measuring circuit and method of a power capacitor. The audible noise measuring method comprises the following steps of: selecting a noise-eliminating test area; mounting a power capacitor to be measured in the noise-eliminating test area; setting a power capacitor to be measured in accompany; building the power capacitor to be measured and the power capacitorto be measured in accompany into a bridge-type power capacitor loading circuit; respectively loading an external high-voltage alternating current power source and an external harmonic power source attwo ends of the bridge-type power capacitor loading circuit, wherein the whole bridge-type circuit achieves resonance state under the common action of power frequency voltage generated by the high-voltage alternating current power source and various time harmonic voltage generated by the harmonic power source; and obtaining various noise values generated by the power capacitor to be measured in an actual work state according to data which are measured by a noise sensor arranged around the power capacitor to be measured and are related to the noise. The invention reduces the random of the noise measuring operation of the power capacitor, so that a measuring result has more comparability and a set of noise measuring method of the power capacitor with systematicness, completeness, science and reasonability is formed.

The invention relates to a continuous coal mining process method of an open-pit coal mine, the used main devices comprises a continuous coal mining machine, a walking type crushing machine of a continuous conveying machine unit, a bridge type transloading machine, a walking type transloading machine, an unloading car, a working face belt type conveyor, an outward transport heading belt type conveying machine and an outward transport machine lane belt type conveying machine, and the continuous coal mining process method adopts the continuous mining-continuous conveying way, and adopts the automatic mining, crushing, transloading, unloading and transportation. The coal mining method has advanced process, reasonable design, compact and continuous arrangement of the devices, safety, stability and reliability, high excavating efficiency, multi-stage transportation, smooth conveying and small occupied area, and can effectively improve the recovery rate of resources, reduce the consumption of fuel oil, reduce the carbon emission, be applicable to needs on low carbon, energy conservation and environmental protection and be a very ideal continuous coal mining process method of the open-pit coal mine.

The present invention discloses a design of a single-chip push-pull bridge sensor, composed of magnetoresistive elements, utilizing on-chip permanent magnets. The permanent magnets are oriented to preset magnetization directions of free layers of adjacent sensor bridge arms so that they point to different directions with respect the same sensing direction, enabling push-pull operation. The push-pull bridge sensor of the present invention is integrated on a single chip. Additionally, an on-chip coil is disclosed to reset or calibrate the magnetization directions of the free layers of the magnetoresistive elements.

An engine control apparatus is disclosed for determining crankshaft position and engine phase of an internal combustion engine through monitoring intake air pressure fluctuations. The opening of the intake valve is mechanically linked to the crankshaft position of an engine. When the intake valve opens it creates air pressure fluctuations in the air induction system of the engine. The control apparatus is configured to determine intake air pressure fluctuations indicative of an intake air event and thus a particular crankshaft position, and their corresponding period of the engine cycle. The controller then uses this information to determine crankshaft speed and position for the purpose of fuel injection and ignition timing of the internal combustion engine. Engine phase is also determined on four-stroke engines. The engine may also include a crankshaft position sensor in combination with monitoring intake air pressure fluctuations to increase resolution in determination of crankshaft position. A circuit is provided for simultaneously measuring intake temperature using a single bridge type pressure sensor in order to calculate air mass flow rate.

The invention provides a method for predicating noise simulation of a rail transit bridge structure. The method can be used for widening the noise analysis frequency band of a bridge structure and improving the predication precision and the calculation efficiency, and is applicable to structural noise analysis for bridges of different types. The method comprises the following steps: firstly collecting prediction parameters for noise simulation of the rail transit bridge structure and inputting the prediction parameters into a low frequency band train-rail-bridge coupled vibration model and an intermediate-high frequency band train-rail-bridge coupled vibration model so as to respectively calculate the vibratory response of the bridge structure and the vibratory response of a steel rail; and establishing a bridge sound radiation boundary element model with low-frequency band and a bridge sound radiation statistic energy analysis model with an intermediate-high frequency band, calculating the noise radiation of the bridge structure in the low-frequency band and the intermediate-high frequency band, and then utilizing the noise composition principle to predicate the total noises radiated by the bridge structure.

The invention discloses an electric vehicle charging and discharging and motor driving integrated device. The device comprises a three-phase bridge type two-way DC / AC converter, an isolated three-portDC / DC converter, a main controller, an integrated device operating mode switching device, a single-phase alternating-current power source input interface device and a single-phase alternating-currentoutput interface. A three-phase inverter for driving a motor in an electric vehicle driving system is subjected to topological reconstruction to form a single-phase rectifier in charging or a single-phase inverter in outward power supplying, so that an integral hardware circuit structure is formed. The three-phase bridge type two-way DC / AC converter, the isolated three-port DC / DC converter, a relay switch and corresponding driving modules are subjected to control switching according to an integral control method in the main controller, so that seamless switching of charging-discharging and driving modes is realized, and braking energy recovery, V2V / V2L and vehicular low-voltage storage battery charging functions are realized. The integrated device has advantages of optimized size, weightreduction, cost saving and reliability improvement.

The present invention discloses a design and manufacturing method for a single-chip magnetic sensor bridge. The sensor bridge comprises four magnetoresistive elements. The magnetization of the pinned layer of each of the four magnetoresistive elements is set in the same direction, but the magnetization directions of the free layers of the magnetoresistive elements on adjacent arms of the bridge are set at different angles with respect to the pinned layer magnetization direction. The absolute values of the angles of the magnetization directions of the free layers of all four magnetoresistive elements are the same with respect with their pinning layers. The disclosed magnetic biasing scheme enables the integration of a push-pull Wheatstone bridge magnetic field sensor on a single chip with better performance, lower cost, and easier manufacturability than conventional magnetoresistive sensor designs.

The invention relates to an angle-free stone automatic cutting machine, comprising a bridge type machine rack 1 which comprises a beam, a guide rail support and a bottom beam, a cutting machine head 2which comprises a water-cooling motor and a tool, and a working table 3 which comprises a tabletop board, a large gear and a turning cushion plate; the cutting machine head 2 moves along the longitudinal and horizontal direction when being arranged on the beam, and comprises a machine head assembly 21 which rotates under the driving of a worm gear and can swing around a central shaft; the tabletop board of the working table 3 is driven by the large gear driven by a speed reducer, is supported by four supporting wheels, rotates on the turning cushion plate and is detected by a coder; the turning cushion plate and the tabletop board can turn over 85 degrees under the driving of an oil cylinder. The water-cooling motor is provided with a cooling water coil pipe between a stator sleeve and amotor shell, the coil pipe is soaked in cooling oil. The working table can move arbitrarily with 360 degrees on the plane, the processing precision is high, the equipment is simple and the machine issuitable for processing stones with various shapes.

The invention discloses a soft start method of an LLC resonant converter. The LLC resonant converter comprises a bridge-type switching circuit, a resonance circuit, a transformer, a rectifying circuit and a filtering circuit which are all connected in sequence, wherein the resonance circuit is composed of a resonant inductor and a resonant capacitor connected in series. According to the method, the initialized duty ratio of a driving signal is D0, and the initialized driving frequency is f0, wherein the value of the D0 ranges from 0 to 15 percent, the value of the f0 ranges from 1.5fr to 2.5fr, and the fr is the resonant frequency. The duty ratio of the driving signal and the driving frequency respectively increase and decrease linearly along with time or respectively increase and decrease exponentially along with time, so that while the duty ratio of the driving signal increases to 50 percent, the driving frequency decreases to the resonance frequency fr, and soft start of the LLC resonant converter is achieved. Through the method, impact current occurring in the start process of the resonant circuit can be restrained, the start time is short, a driving circuit is easy to obtain, and cost is low.

The invention discloses a power supply system for an electric locomotive. The power supply system comprises an external power supply, a traction invertor, an auxiliary invertor and a charger, wherein the charger comprises a first three-phase bridge-type inversion circuit; the alternating current side of the first three-phase bridge-type inversion circuit is connected with the low voltage side of a first three-phase transformer and the direct current side of the first three-phase bridge-type inversion circuit is connected with a storage battery; and the high voltage side of the first three-phase transformer is coupled to the output end of the auxiliary invertor. The power supply system for the electric locomotive can supply power to a traction motor by using the storage battery when a contact network fails; and low speed running of the electric locomotive can be retained.

The invention relates to a cable laying method and system. The cable laying method comprises the following steps of: acquiring three-dimensional (3D) bridge information built by 3D design software; matching a bridge number in the 3D bridge information with a bridge type in a database to find the bridge type corresponding to the bridge number and realize the conversion of the bridge number to the bridge type; and forming a 3D bridge mode according to imported bridge position information, device position information and the bridge type in the 3D bridge information. By the cable laying method, the bridge position information, the device position information and the bridge type are unnecessarily reset in the cable laying system to build the 3D bridge model; through information matching, the bridge number in the 3D bridge information built by the 3D design software is converted into information required for cable laying, namely the bridge type, the bridge type is unnecessarily set, and thus the laying efficiency is improved; and the most reasonable cable path is searched according to parameters related to cable laying, rapidness and accuracy are achieved, manual labor is not needed to search the path, and the laying efficiency is improved.

The invention discloses an MEMS non-refrigerated two-band infrared detector and a preparation method thereof. The detector comprises a silicon substrate, a bottom-layer electrode, and a micro bridge structure anchored on the silicon substrate, and is characterized by also comprising a bridge type controllable reflecting layer which is arranged in a cavity formed by the micro bridge structure and the silicon substrate and anchored on both sides of the bottom-layer electrode and the silicon substrate, wherein the bridge type controllable reflecting layer can be adjusted upward or downward by using anchor points playing a supporting role and a static electricity drive arranged between the bridge type controllable reflecting layer and the bottom-layer electrode, so that the cavity length of a resonance absorption cavity is controllable, and the response at two bands with wavelengths of 3 to 5mum and 8 to 12mum respectively is realized. The method for preparing the detector adopts the surface sacrificial layer process twice to prepare the micro bridge structure and the bridge type controllable reflecting layer, so that the method is simple in process, and easily realized.

The invention discloses a DC-DC converter circuit and a relevant control method; wherein, the converter comprises two DC-AC inverters; each can create symmetrical and isolated square waves or other similar AC output voltage. Through the movement of the phase of one of the DC-AC inverters, the overlapping part of the corresponding voltage of a DC output filtration circuit, which is the two DC-AC inverters can be applied to, will be changed accordingly, so as to reach the target of regulating the output voltage. A double half-bridge and double full-bridge DC-DC converters are two typical types of the converters. During normal running process, the bridge-type inverter is always running in a 50 percent of duty cycle, so as to fulfill Zero Voltage Switching (ZVS) in broad loads. Meanwhile, the invention can also eliminate circulation current, so as to improve the efficiency of power conversion. As for the adjustment and startup of low output voltage, the circuit can work in a Pulse Width Modulation (PWM) status.

The invention discloses a motor controller having driving, charging and discharging functions. The motor controller comprises a DC-DC bidirectional converter, a three-phase bridge type DC-AC bidirectional converter, a driving-charging mode switching device, an alternating current power supply input interface device and a central control microprocessor, wherein a charging battery, the DC-DC bidirectional converter, the three-phase bridge type DC-AC bidirectional converter and a motor are sequentially connected to form a motor driving loop, the alternating current power supply input interface device, the three-phase bridge type DC-AC bidirectional converter, the DC-DC bidirectional converter and the charging battery are sequentially connected to form a battery charging loop, the central control microprocessor controls the DC-DC bidirectional converter and the three-phase bridge type DC-AC bidirectional converter and utilizes the driving-charging mode switching device to enable the motor driving loop to be in a working state and accordingly enable the battery charging loop to be disconnected or enable the motor driving loop to be disconnected and enable the battery charging loop to be in a working state. The motor controller is simple in circuit structure, reliable in work, low in cost, light in weight, small in size and high in power factor, and electronic elements and devices are decreased.

The invention discloses a positive and negative pulse charging converter for a storage battery. A bilateral full-bridge LLC (Logical Link Control) resonant circuit is taken as a main charging topology, so that the defect that the implementation of negative pulses is limited by application occasions and power levels is overcome while soft switching is realized. Meanwhile, a power main circuit comprises a bridge type uncontrollable rectifying circuit and a bilateral full-bridge LLC resonant circuit. During discharging of the storage battery, the bus capacitive voltage on a high-voltage side, namely, a rectifying side is raised. During initial charging at a positive pulse charging stage, open-loop control is adopted, namely, the duty ratios and frequencies of switching tubes Q1-Q4 are kept the same as the duty ratios and frequencies in a previous charging period. Since the bus capacitive voltage is high, the charging current is increased correspondingly and decreased gradually till a charging controller works normally, and the charging current is stable. In this way, sharp pulse charging current is formed in order to enhance the repair, namely, depolarization effect of the storage battery. Moreover, both the charging current and discharging current of the storage battery are under high-frequency pulsation, and an LC filter filters higher harmonics of the charging current while smoothening the high-frequency pulsation.

The invention relates to a novel topological structure voltage source type inverter and an adjusting method. The structure is a star-like topological structure and is formed by connecting a three-phase bridge type inverter in series at a neutral point of cascaded inverters connected in a star shape. Compared with the conventional cascaded inverters connected in the star shape, the novel topological structure theoretically has a function of completely compensating negative sequence current; and compared with the conventional three-phase bridge type inverter, the novel topological structure can realize extended application under high voltage level without using a device cascade or MMC (Multilevel Converter) structure. In the novel topological structure, a direct current side of the three-phase bridge type inverter can be connected with a direct current network, energy storage equipment or a power grid through a current transformer; the inverter can be widely applied to the fields of flexible direct current power transmission, new energy connection, high voltage frequency converter and the like; and the application prospect of the voltage source type inverter in the corresponding field is expanded. The novel topological structure has good generalization performance based on mature unit cascade and three-phase inverter structure and control technology.

A piezoelectric energy captor enabling to capture energy and store energy effectively consists of piezoelectric beam formed by two layers of piezoelectric ceramic plates and intermediate sandwich layer, electrode prepared by plating metal silver on ceramic plate, inductance coil with control switch, bridge type of rectifier, rectifying capacitor, Cuk type of dc-dc converter formed by transistor switch and electric inductance as well as diode, filtering capacitor for stabilizing charge current, and energy storing battery.

The invention discloses a counter-potential zero-crossing detection circuit and a counter-potential zero-crossing detection method for a brushless direct-current motor, wherein in the counter-potential zero-crossing detection circuit for the brushless direct-current motor, a three-phase winding of the brushless direct-current motor is connected with a direct-current power supply via a bridge-type inverter, and the bridge-type inverter is formed by connecting six power switch tubes; the counter-potential zero-crossing detection circuit is characterized by comprising three detection modules used for detecting the counter-potential zero crossing of a phase A, a phase B and a phase C, and provided with the same structure; and each detection module comprises a comparator, and two electronic switch voltage-dividing module provided with the same structure and same circuit parameters. Via the counter-potential zero-crossing detection circuit and the counter-potential zero-crossing detection method disclosed by the invention, the danger that a counter-potential amplitude value is greater than the power supply voltage value of the detection circuit in case of high speed can be avoided. Simultaneously, as a mode that low-speed-area counter-potential sampling and high-speed-area counter-potential sampling are switched by controlling the signal duty ratio is adopted, the counter-potential zero-crossing detection effect in a low-speed area can be effectively improved. Experimental results indicate that the counter-potential zero-crossing detection circuit and the counter-potential zero-crossing detection method for the brushless direct-current motor can ensure the working of the motor within a relatively wide rotational speed range.

The invention discloses a Hall phase sequence detecting method of a brushless direct-current motor, relating to the technical field of the brushless direct-current motor. Based on the operating principle of the brushless direct-current motor and the magnetic potential synthesis principle, the method adopts the magnetic potential of a fixed stator to position a rotor, and obtains the position of the rotor by reading a signal of a Hall position sensor, thus determining the relation of the magnetic potential of a stator and the position of the rotor. The invention also discloses a phase sequence detecting device of the brushless direct-current motor, comprising a computational processing module, a motor-driven module and a man-machine interface module, wherein the man-machine interface module comprises an input unit and an output display unit; a motor-driven unit is in a three-phase inverse bridge-type structure; and the calculated processing module is respectively connected with the motor-driven module, the input unit and the output display unit by signals. Compared with the prior art, the detecting device has the advantages that the structure is simple, the use is convenient, the cost is low and the like.

The invention provides a full-automatic paper money clearing and packaging assembly line, structurally comprising a clearing and binding machine, a paper money sorting and transmitting mechanism, a stacking and wrapping machine, a paper money plastic packaging machine, a follow-up detecting and tidying mechanism, transmission belts and assorted sensors, wherein the clearing and binding machine, the paper money sorting and transmitting mechanism, the stacking and wrapping machine, the paper money plastic packaging machine and the follow-up detecting and tidying mechanism are sequentially arranged according to a technique flow order and are controlled by a main control management unit; and the transmission belts and the assorted sensors are arranged among the mechanisms. According to the main points, the paper money sorting and transmitting mechanism between the clearing and binding machine and the staking and wrapping machine refers to a sorting and transmitting channel formed by a middle transmission belt and parallel-connected double-channel transmission belts through bridge type connection. With the adoption of the automatic assembly line, paper money returned back to a bank can be automatically distinguished into ATM (Automatic Teller Machine) currency, circulation currency and damaged currency through a clearing and binding module according to a condition of the paper money, and then be automatically cleared up, boxed and put in storage through stamping, sorting, stacking, binding, labeling and plastically packaging without manual intervention, so that the high automation and the high production efficiency can be realized.

A delta type inverter is used in conjunction with a closed-loop motor controller to provide a control device for driving a three phase brushless direct current motor. The delta inverter has one-half of the solid state switching devices and diodes required by conventional bridge type inventers, thereby improved reliability, and enabling the motor control device to have reduced size, cost and weight. The closed-loop motor controller may include a torque loop for reducing torque ripple during operation of the motor.

The invention relates to a method for checking and measuring the distortion of cement-based composite material caused by force. A conducting film as sensor, which is composed of short-cut carbon fiber, graphite power and adhesion agent, is coated on the surface of specimen of cement-based composite material. Circuit signal collector in bridge type is adopted in the invention. With the specimen ofcement-based composite material being forced, loaded and impacted, uneven distortion and cracking in the specimen of cement-based composite material can be detected by checking and measuring variation of voltage and current caused by the variation of resistance of said conducting film.

The invention discloses a lighterage operation bridge type loading and unloading ship machine (1), which comprises three parts, namely an unloading ship machine (1), a loading ship machine (2) and a middle belt conveyor (3), wherein the loading ship machine is arranged on the lower side of the unloading ship machine (1); a rotary and pitchable telescopic arm frame belt conveyor (21) is arranged above a wharf boat (4) and a ship (6) to be loaded on the other side; the middle belt conveyor (3) is arranged between the unloading ship machine (1) and the loading ship machine (2); one end of the middle belt conveyor (3) is arranged below a discharge hole of a hopper (13) of the unloading ship machine (1), and the other end of the middle belt conveyor (3) is connected with the telescopic arm frame belt conveyor (21) of the loading ship machine (2); and the loading ship machine (2) and the middle belt conveyor (3) are supported on a supporting frame (11). Due to a three-in-one loading and unloading ship machine, a large number of tail vehicles, metal structures and other parts are saved, so that the weight of the machine is lightened, the whole system has a simple and compact structure and small occupied space, and the cost of a lighterage operation system is reduced.