56results about How to "Convenient for daily inspection" patented technology

The invention provides a handheld partial discharge detector of a transformer. The handheld partial discharge detector comprises an ultrasonic sensor, a high-frequency current sensor, a data acquisition module, a signal conditioning unit and a data diagnosis and analysis module, wherein the data acquisition module is used for acquiring detection data according to a discharge signal and a high-frequency current pulse signal, wherein the detection data comprise ultrasonic sensor data and high-frequency current sensor data; the signal conditioning unit is used for receiving the detection data transmitted by the data acquisition module and carrying out the pre-process on the detection data to generate data to be analyzed; and the data diagnosis and analysis module is sued for carrying out local discharge detection analysis according to the data to be analyzed. The handheld partial discharge detector of the transformer, disclosed by the invention, can carry out effective detection and analysis on a local discharge signal of the transformer generated to a field transformer and judges whether the interior of the transformer generates local discharge or not through sound and electricity combined analysis, and carries out qualitative estimation on the intensity of the local discharge signal so as to have the advantages of compact structure, handheld type, portability, convenience in detection and the like.

The invention relates to an automatic server inspection method and system based on multiple threads. The method comprises the steps that 1, an inspection configuration file for classing servers into groups is configured; 2, inspection configuration information is read according to the inspection configuration file, multiple threads are used for executing an inspection task on each group of servers according to the inspection configuration information, and inspection result data is stored in a database; 3, the inspection result data is ranked according to the servers and abnormal detection items corresponding to the servers, and ranking results are summarized; 4, warning information is generated according to the summary result and sent to operation and maintenance personnel. According to the method, the inspection task is executed on different server groups according to the inspection configuration information in a concurrent-number, multi-thread and unattended mode according to a specified inspection period, abnormal data information is sent to e-mail addresses of the operation and maintenance personnel in a warning mode, automatic inspection is realized, and inspection efficiency and inspection quality are improved.

The invention discloses a switch cabinet partial discharge itinerant detector which comprises an ultrahigh frequency sensor, a cable and a detecting terminal, wherein the ultrahigh frequency sensor is connected with the detecting terminal through the cable. The detecting terminal comprises a signal conditioning unit, a data acquisition card and a touch screen. The signal conditioning unit comprises a band-pass filter, a signal amplifier and a pulse broadening device, wherein the band-pass filter, the signal amplifier, the pulse broadening device, the data acquisition card and the touch screen are connected in sequence. The switch cabinet partial discharge itinerant detector is compact in structure, convenient to carry and detect due to the fact that the detecting terminal is a handheld type, high in working efficiency and capable of effectively detecting the switch cabinet partial discharge by utilizing of an ultrahigh frequency detecting method.

The invention provides a transformer substation settling and pole stress monitoring system. The transformer substation settling and pole stress monitoring system comprises an in-station settling monitoring subsystem, a tower pole and surrounding soil mass differential settlement monitoring subsystem, an inclination monitoring subsystem, a structural support stress strain monitoring subsystem, a satellite positioning monitoring subsystem, a data management and display subsystem and a structural safety assessment and early-warning subsystem. All monitoring subsystems can automatically complete data collection, the data management and display subsystem can comprehensively process monitoring information collected and uploaded by all the monitoring subsystems, the functions of classified filing, query, saving and the like of the data are achieved, and monitored information is displayed to a user; besides, sorted data is subjected to settling thorough the structural safety assessment and early-warning subsystem, the safety state of a transformer substation is assessed, the user is assisted in scientific decision making, or the user is informed of timely handling, and a technical supportis provided for safe running of the transformer substation.

The invention discloses a track-hanging robot. The track-hanging robot comprises a track and a moving trolley running on the track. A sliding contact wire track is hoisted below the track in the trackdirection. The moving trolley comprises a trolley body, a walking driving module, a moving power-taking module, a guide module, a lifting device and a detecting cloud platform. The trolley body, thelifting device and the detecting cloud platform are connected in sequence. The walking driving module is arranged on the upper part of the trolley body and in rolling contact to the upper part of thetrack across the sliding contact wire track, the guide module is arranged on the upper surface of the trolley body and in rolling contact to the side of the track across the sliding contact wire track, and the moving power-taking module is connected with the guide module and extends into the sliding contact wire track to collect power. By arranging a sliding contact wire outside, the sliding contact wire is miniaturized, and each modular structure makes the installation and disassembly convenient and fast; and through the arrangement of the adjustable moving power-taking module being matched with the guide module and the walking driving module, the structure is compact, the overall size is reduced, the light weight is realized, and the installation, disassembly and maintenance are convenient.

The invention discloses a modularized intelligent pure electric passenger car air conditioner comprising a housing, an inverter compressor, a condenser, a steamer, a gas-liquid separator and a four-way valve. The inverter compressor, the condenser, the steamer and the gas-liquid separator are connected with the four-way valve via pipelines; and the housing is divided into a first separation room,a second separation room, a third separation room. Relative equipment components are integrated and installed to the middle of the top of a passenger car, so daily inspection and maintenance of the air conditioner system can be facilitated, and efficiency can be improved; pipelines required for relative equipment connection can be greatly reduced, so cost can be effectively reduced and installation difficulty can be reduced; and space for installation can be lowered.

The invention discloses a powder brushing machine. The machine comprises an even number of sections of conveying belts which are arranged in a way of being successively reduced in a stepped manner andused for conveying semi-finished ceramic wafers, a cleaning mechanism which is arranged above the conveying belts and used for conducting powder brushing and cleaning on semi-finished ceramic waferson the conveying belts, a dust suction pipeline which is connected with the cleaning mechanism and externally connected with a dust removal mechanism, and a turnover mechanism which is arranged between the conveying belts at the two ends and used for turning over the semi-finished ceramic wafers. When semi-finished ceramic wafers are conveyed on the conveying belts, the cleaning mechanism brushespowder on the front faces of the odd number of sections of conveying belts, and the cleaning mechanism brushes powder on the back face of the even number of sections of conveying belts. Dust on the upper faces and the lower faces of semi-finished ceramic wafers can be brushed away well, and the qualified ceramic wafer can be sintered conveniently in the follow-up process; in addition, dust can bewell collected, the overall working environment is clean and tidy, and daily inspection and maintenance of workers are facilitated.

The invention provides a ground driving device with a hydraulic, speed-limiting and temperature-control reverse rotation preventing function and relates to a screw pump ground driving device used in an oil field. The ground driving device with the hydraulic, speed-limiting and temperature-control reverse rotation preventing function is designed mainly for solving the problem that an existing screw pump driving device has potential safety hazard. The ground driving device with the hydraulic, speed-limiting and temperature-control reverse rotation preventing function comprises a reduction gearbox, a vertical shaft, a big belt wheel, a gear pump and a hydraulic oil tank. The gear pump is connected with a brake caliper through an oil pipe. A brake disc is mounted at the top of the vertical shaft. An upper friction block and a lower friction block are mounted on the brake caliper. The brake caliper communicates with an upper hydraulic cavity and a lower hydraulic cavity through pipelines. A bevel gear shell of a brake hub is fixed to the reduction gearbox. A ratchet wheel sleeve of a pawl type centrifugal overrun clutch is arranged on the bevel gear shell. A brake disc is mounted on the ratchet wheel sleeve. A small belt wheel fixed to the brake disc is connected with a belt wheel on the gear pump through a belt. A pawl is mounted on the brake disc. The rear ends of two brake shoes are hinged together. The front end of one brake shoe is mounted on the brake disc. The front ends of the two brake shoes are connected through a spring. Brake pads are arranged on the brake shoes. The ground driving device with the hydraulic, speed-limiting and temperature-control reverse rotation preventing function has the advantage of being high in safety.

The invention discloses a monoblock cast framework for a metro bogie with an axle box arranged inside and belongs to the field of framework devices for rail vehicle bogies. The monoblock cast framework comprises a crossbeam unit and two side beam units, the side beam units are parallelly and symmetrically arranged on two sides of the crossbeam unit, and the crossbeam unit and the side beam units are integrally formed through a casting process. The number of weld joints is reduced substantially, and overall structural strength and fatigue strength of the framework are improved. Minimum curve passing radius of the train bogie using the framework is reduced to at least 36m, and turning maneuverability and flexibility of the new bogie are improved substantially; a side beam gearbox hanging seat is arranged on each side beam unit, a gearbox hanging rod can be ensured to be close to a gearbox shaft to greatest extent, and coupling displacement quantity is reduced, so that occupied space of adriving device is reduced. In addition, by the structure, long-cantilever structure of the gearbox hanging seat can be avoided to overcome the defect that existing long-cantilever structure is low infatigue strength and short in service life.

The invention relates to a Baidu map-based power distribution station site positioning query method, which is convenient to apply and scientific and reasonable in design, and comprises the following specific steps: positioning and collecting site sites; renaming the station house, and adding the renamed station house to the classification folder; and repeating the step 1 and the step 2, and counting all station building information: during outdoor operation, quickly positioning and navigating according to the station building and the name. When operation and maintenance or first-aid repair personnel go out for operation, the mobile phone can be used for accurate and rapid positioning and route navigation of the station address of the power distribution station, the onsite arrival time is greatly shortened, and the first-aid repair efficiency is improved. Meanwhile, the number and position information of the station buildings in the designated area can be displayed in groups at the Baidu map end, and great convenience is brought to daily inspection and centralized classified operation and maintenance of the power distribution station buildings.

The invention provides an air cooler capable of accelerating the cooling effect, and relates to the technical field of air cooler equipment. The air cooler capable of accelerating the cooling effect comprises stainless steel supporting frames, supporting steel plates are fixedly connected to the centers of the peripheral sides of the stainless steel supporting frames, evaporation wall systems corresponding to the supporting steel plates are arranged at the centers of the peripheral sides of the stainless steel supporting frame, water feeding systems are installed at the tops of the multiple evaporation wall systems, water return systems corresponding to the water feeding systems are arranged at the bottoms of the multiple evaporation wall systems, metal wind shields are installed in the centers of the tops of the stainless steel supporting frames, and cold air systems corresponding to the evaporation wall systems are installed on the two sides of the centers of the metal wind shields.By using a evaporation precooler, air flows to finned pipes after being purified, so that corrosion and scaling of the finned pipes are effectively relieved, the finned pipes are protected, the service cycle of air cooling is prolonged, and the safety and reliability of operation are improved.

The invention discloses a primary frequency regulation system of an energy-storage hydraulic-type wind generating set and a control method. The primary frequency regulation system comprises a wind wheel, couplers, a fixed displacement pump, a motor, a proportional throttle valve, overflow valves, a one-way valve, a hydraulic oil tank, a variable displacement motor, a hydraulic accumulator subsystem, a safety valve set of the hydraulic accumulator subsystem, an excitation synchronous generator, a grid-connected cabinet, a primary frequency regulation controller, a pressure sensor, a flow sensor, a rotating speed torque sensor and a hydraulic pipe. The control method includes the steps that in the unit operation process, for instant dynamic fluctuation of power network frequency, dynamic balance of the output frequency of the hydraulic-type wind generating set is achieved through a hydraulic motor energy-storage subsystem. According to the primary frequency regulation system of the energy-storage hydraulic-type wind generating set and the control method, in the unit operation process, compared with inertia energy storage of a wind machine, the hydraulic accumulator subsystem stores more energy, bears power network frequency fluctuation with the larger range, and furthest keeps unit-grid-connection stable operation.

The invention discloses a current transformer supporting frame, and the frame comprises a transformer; a high-voltage binding post and a low-voltage binding post are arranged at the top of the transformer, and a mutual inductance mechanism is installed on the right side of the top of the transformer. The mutual inductance mechanism comprises a support, a supporting rod, a transformer box and a transformer, and the left side of the support is clamped to a protrusion on the right side of the top of the transformer; bolts are installed at the upper end and the lower end of the left side of the support and are in threaded connection with the left side of the support, an installation base is fixedly connected to the top of the support, and a top transformer box of the installation base is movably installed at the top of the installation base. The three mutual inductors are installed on a fan-shaped sliding rail II, the three mutual inductors form a fan shape, and therefore wires can easilypenetrate through and be easily wired, the mutual inductor box is installed on the installation base, the installation base is fixedly connected to the support, the support is tightly connected to theprotrusion on the right side of the transformer through bolts, and the mutual inductor box is not prone to loosening.

The invention discloses a switch cabinet local discharge detecting instrument based on an ultrahigh frequency antenna sensor. The switch cabinet local discharge detecting instrument comprises the ultrahigh frequency antenna sensor with the frequency band ranging from 500MHz to 1.5GHz, a data line and a detecting device. The ultrahigh frequency antenna sensor is connected with the detecting device through a cable. The detecting device comprises a signal reasoning unit, a data collecting card, an ARM single-chip microcomputer, a printer and a touch screen, wherein the ARM single-chip microcomputer is connected with the printer and the touch screen, and the signal reasoning unit comprises a band-pass filter, a signal amplifier and a pulse stretcher. The switch cabinet local discharge detecting instrument has the advantages that the ultrahigh frequency local discharge signals generated by a switch cabinet can be effectively detected and analyzed on site, whether local discharge occurs in the switch cabinet or not can be judged, qualitative estimation of local discharge intensity can be performed, and the instrument is low in cost, compact in structure, convenient to carry during detection, high in sensitivity and signal to noise ratio, high in work efficiency, and convenient for the staff in daily detection.

The invention discloses a portable high-precision rotatable spark erosion perforating machine. The portable high-precision rotatable spark erosion perforating machine comprises a main machine and an electric control box. The electric control box is electrically connected with the main machine and is used for controlling the main machine to work. The main machine comprises a base, a rotary lifting mechanism and a machine head. The height and the rotary angle of the machine head are controlled through the rotary lifting mechanism. The electric control box comprises a box body outer shell, a box frame, a middle partition plate, a bottom plate, an accessory box and a lifting handle. The accessory box is arranged on the lower half portion of the internal space of the control box and is used for loading all parts of the spark erosion perforating machine after the spark erosion perforating machine is disassembled. The spark erosion perforating machine has the advantages of being low in cost, small in size, light in weight, easy to operate and easy to carry, and the daily inspection and maintenance are easy due to the design of the electric control box. Matching parts and components are provided with fixed positions and packaging containers, so that clear installation orders are easy to arrange, and collision, damage and loss of the spark erosion perforating machine in the transportation process can be avoided.

The invention discloses a power line laying detachable type wiring device, the cross section of which is in the shape of a quadrangle. The wiring device is constituted by a bottom plate, side plates, a supporting rack, a cover plate, and a baffle plate. The bottom plate is provided with transmitting holes, and the lower surface is provided with at least two supporting blocks, and the upper surface of the cover plate is uniformly provided with diversion grooves, and in addition, the baffle plate is additionally provided with wire penetrating holes. The outer surfaces of the side plates are respectively provided with at least one conveying grooves, and at least one supporting rack is disposed on the inner surfaces of the side plates, and each supporting rack is constituted by at least two supporting plates, each of which is constituted by a carrying plate and a connecting plate, and the carrying plate and the connecting plate are connected together by a reinforced rib plate. Compared to the conventional wire trench used for the wire arranging, the structure is simple, and the use is flexible and convenient, and the site adaptability is strong; the constriction costs are low, the construction strength is low, and the construction efficiency is high; the wire working environment can be greatly improved, and the daily inspection or the replacement of the power wire can be facilitated; and the wiring device is widely used for various power wire arranging occasions.

The invention relates to the technical field of rolling shutter doors, and discloses a self-triggering fireproof rolling shutter door with good safety. The self-triggering fireproof rolling shutter door with good safety comprises a top box. The inner top wall of the top box is fixedly connected with a water tank, and the bottom of the water tank is movably connected with a T-shaped plate. A springbox is fixedly connected to the bottom of the top box. A spring I is fixedly connected to the inner bottom wall of the spring box. A spray head is fixedly connected to the bottom of the top box. A vertical plate is fixedly connected to the bottom of the top box. The self-triggering fire-proof rolling shutter door with good safety is provided with a folding tooth plate and a folding plate on the side surface of a rolling shutter door body. When a fire occurs, a fuse body is blown and causes a motor to drive the rolling shutter door body to descend, and a vertical gear rotates during the descending process and drives a reel to rotate, so that a rope is retracted inside the reel, and the T-shaped plate is pulled to move downwards, making the water spraying from the water tank through the spray head, so as to extinguish fire and cool the rolling shutter door body, prevent the damage of the rolling shutter door body, and achieve the effect of protection of the rolling shutter door body.

Provided in the invention is a novel carbon brush structure. The structure is formed by a carbon brush pedestal, a carbon brush pipe seat fixed on the carbon brush pedestal, and carbon brush bodies installed in the carbon brush pipe seat. An elastic support element is arranged between the carbon brush pipe seat and the carbon brush pedestal. Leading-put wires are arranged inside the carbon brush bodies; and one end of each wire is connected with one carbon brush body by a bolt and the other end is connected with a copper sheet cap arranged on the surface of a dust-removing distribution device. Elastic flexible insulating tubes sleeve the peripheries of the wires; and one end of each elastic flexible insulating tube is connected with the dust-removing distribution device and the other end is connected with an insulating dust-removing box connected to one side of each carbon brush body. On the basis of the structure, wire shedding can be prevented; and the service life is long. Moreover, the extrusion force applied on each carbon brush is identical and thus a fault can be avoided; and the dust collection effect is good and the maintenance becomes convenient.

The invention discloses a land leveler, belongs to the technical field of engineering machinery, and solves the problems that in the prior art, due to the arrangement of a traditional land leveler, various elements are inconvenient to daily repair, check and maintain, and the elements are easy to collide by accidents. The land leveler is provided with a main body structure comprising a front frameand a rear frame, wherein the front frame and the rear frame are connected; a gearbox is arranged on the rear frame; a urea tank is arranged between the rear end of the rear frame and the gearbox; afuel tank is arranged in a framework of the front frame; a first protection plate is arranged on the bottom parts of the gearbox and the urea tank; and a second protection plate is arranged on the bottom part of the fuel tank. The invention is mainly applied to the land leveler.

The invention provides a comprehensive system suitable for a full underground water plant. The comprehensive system comprises a sunken square and a plurality of water plant subareas, and each water plant subarea communicates with the sunken square; the sunken square is provided with a light transmission system, a ventilation system and a water dredging system; and the light transmission system isarranged at the top of the sunken square, the water dredging system is arranged along the circumferential direction of the sunken square, and the ventilation system enables outside air to be supplemented to the water plant subareas through the sunken square. According to the comprehensive system suitable for the full underground water plant, the sunken square is additionally arranged, and a watertank is organically combined with the full underground water plant to form an organic ecological complex, so that the number of floor staircases is effectively reduced by about 50%, the number of airshafts is reduced, the construction cost is greatly reduced, the construction space is saved, an air supply and exhaust system is optimized, integrated layout of ground landscape is achieved, and thelandscape effect is significantly improved.

The uric acid detection kit comprises a first reagent, a second reagent and a diluent, the first reagent comprises a phosphate buffer and polyethylene glycol 6000, and the second reagent further comprises polyoxyethylene lauryl ether, sodium azide and a goat anti-human uric acid antibody. The invention also discloses preparation of the kit. According to the kit disclosed by the invention, uric acid in urine is oxidized under the action of uricase to generate allantoin and hydrogen peroxide, then the hydrogen peroxide, 4-aminoantipyrine (4-AAP) and N-ethyl-N-(2-hydroxy-3-sulfopropyl)-3-methylaniline sodium salt (TOOS) are catalyzed by peroxidase to generate a colored substance, and the colored substance is used as a detection reagent. The concentration of uric acid in a human body can be quantitatively detected, the method is simple, and the used reagents are common reagents, so that daily inspection of uric acid is facilitated; meanwhile, the kit is high in accuracy and good in stability when used for detecting uric acid and is suitable for large-scale use.

The invention discloses a computer accessory with a detection function for preventing strong electromagnetic interference, which solves the problem of poor visual effect created only by the illumination emitted from a computer screen under the condition of no light at night, and having certain harm to eyes. With the feeling to open the computer, a user is easy to bump against the foot of the desk,computer hardware or other sharp places, causing harm. The computer accessory with a detection function for preventing strong electromagnetic interference of the invention comprises a single chip microcomputer, an infrared pyroelectric sensor, a power supply module, a lighting module and an illumination detection module. The invention has the advantages of lighting the lamp when a person is close, turning off the lamp when the person leaves, saving energy, creating a good visual atmosphere, protecting eyes and the like.

The invention introduces a high-precision rotatable electric spark perforator, including a main machine and an electric control box, the electric control box is electrically connected with the main machine, and the electric control box is used to control the work of the main machine; the main machine includes a base, a rotating lifting mechanism and a machine head , the height and rotation angle of the machine head are controlled by the rotating lifting mechanism; the electrical control box includes the box shell, the box frame, the middle partition, the bottom plate, the accessory box and the handle, and the accessory box is located in the lower half of the inner space of the control box. It is used to load the disassembled parts of the electric spark piercer. The electric spark piercer not only has the advantages of low cost, small size, light weight, simple operation and portability, but also the design of its electrical control box is easy for daily inspection and maintenance; the supporting parts have fixed positions and packaging containers, It is convenient to set a clear and clear installation sequence, and can avoid bumping, damage and loss of the electric spark piercer during transportation.

The invention provides a polygonal central cylinder of a power-driven hydraulic orange-peel bucket. The polygonal central cylinder comprises a central cylinder body which is polygonal, the polygonal cylinder body comprises an upper cylinder body and a lower cylinder body, longitudinal reinforcing rib plates are arranged on the edges of the upper cylinder body and the lower cylinder body, the upper cylinder body is an upwards-open cylinder body, the upper cylinder body is provided with a motor and a control valve block of a hydraulic system of the motor, the lower cylinder body is an oil tank and provided with an oil pump and a coupling, a rectangular hole is longitudinally formed between each set of reinforcing rib plates on the upper cylinder body, and each rectangular hole is provided with a steel shutter. By means of the polygonal central cylinder, the problem of heat dissipation affecting production due to too high oil temperature of the bucket when the environmental temperature is high is solved, and meanwhile routine inspection and maintenance of the bucket are facilitated. Under the condition that the volume of the oil tank is constant, the heat dissipation surface area of the polygonal oil tank is larger than that of a cylindrical oil tank, the open type upper cylinder body facilitates heat dissipation of the motor, and meanwhile inspection and maintenance of the hydraulic control block are facilitated.

The invention discloses a 10KV high-voltage switch cabinet with a secondary cable chamber at the top. According to the 10KV high-voltage switch cabinet, a comprehensive cable chamber consisting of a rear sealing plate, a cover plate (2), a communication grounding bus, an insulator, a partition plate, a cover plate (1), a bus seat, a header plate and a bracket is arranged above a high-voltage switch cabinet instrument chamber; the rear sealing plate, the partition plate and the header plate are connected with an instrument chamber top cover through bolts, the upper portions of the rear sealingplate, the partition plate and the header plate are connected with the cover plate (1) and the cover plate (2), and the partition plate is positioned between the rear sealing plate and the header plate, so that two semi-closed compartments are formed among the rear sealing plate, the partition plate and the header plate; the compartment between the partition plate and the header plate is also usedas a control bus chamber; and the compartment between the rear sealing plate and the partition plate is used as a secondary cable chamber. According to the invention, the influence on the operation of other switch cabinets due to uncovering of the secondary cable trench cover is effectively avoided; and the space of the instrument chamber is enlarged, so that the maintenance of the instrument chamber is convenient.

The urine microalbumin detection kit comprises a first reagent, a second reagent and a diluent, the first reagent comprises a phosphate buffer salt solution and polyethylene glycol 6000, and the second reagent further comprises polyoxyethylene lauryl ether, sodium azide and a goat anti-human urine microalbumin antibody. The invention also discloses a use method of the kit. According to the kit, microalbumin in urine reacts with a goat anti-human anti-albumin antibody in a liquid phase to generate an mAlb antigen-antibody complex, then the content of the microalbumin in the urine is displayed through an absorbance value, the method is simple, meanwhile, the used reagents are common reagents, and daily inspection of the microalbumin in the urine is facilitated; meanwhile, the kit is high in accuracy and good in stability when being used for detecting microalbuminuria, and is suitable for large-scale use.

The invention provides a ground driving device with a hydraulic, speed-limiting and temperature-control reverse rotation preventing function and relates to a screw pump ground driving device used in an oil field. The ground driving device with the hydraulic, speed-limiting and temperature-control reverse rotation preventing function is designed mainly for solving the problem that an existing screw pump driving device has potential safety hazard. The ground driving device with the hydraulic, speed-limiting and temperature-control reverse rotation preventing function comprises a reduction gearbox, a vertical shaft, a big belt wheel, a gear pump and a hydraulic oil tank. The gear pump is connected with a brake caliper through an oil pipe. A brake disc is mounted at the top of the vertical shaft. An upper friction block and a lower friction block are mounted on the brake caliper. The brake caliper communicates with an upper hydraulic cavity and a lower hydraulic cavity through pipelines. A bevel gear shell of a brake hub is fixed to the reduction gearbox. A ratchet wheel sleeve of a pawl type centrifugal overrun clutch is arranged on the bevel gear shell. A brake disc is mounted on the ratchet wheel sleeve. A small belt wheel fixed to the brake disc is connected with a belt wheel on the gear pump through a belt. A pawl is mounted on the brake disc. The rear ends of two brake shoes are hinged together. The front end of one brake shoe is mounted on the brake disc. The front ends of the two brake shoes are connected through a spring. Brake pads are arranged on the brake shoes. The ground driving device with the hydraulic, speed-limiting and temperature-control reverse rotation preventing function has the advantage of being high in safety.

The invention discloses a built-in wheel set for a bogie with built-in axle boxes and belongs to the field of wheel set devices for bogies of railway vehicles with axle boxes on the inner sides of wheel sets. The built-in wheel set comprises wheels and two built-in axle box devices, and each built-in axle box device comprises a trapezoidal axle box, two ridged rubber spring pieces, a positioning towing bar, two spring piece positioning clips and a semicircular axle box collision-proof gasket. The built-in wheel set for the bogie with the built-in axle boxes has the advantages that extremely high longitudinal stiffness can be obtained while low vertical stiffness is guaranteed, so that high-speed stability of the vehicles is gained; axle box mechanisms are capable of preventing axial movement of the ridged rubber spring pieces effectively and substituting for previous additional axle box protective covers, and accordingly daily inspection of bearings is facilitated; a minimal curve passing radius of the bogie with the built-in axle box mechanisms is remarkably decreased from at least 100 meters previously to at least 36 meters, so that turning maneuverability and flexibility of thenovel bogie are improved substantially.