12169 results about "Oil pump" patented technology

The invention provides a hydropower station auxiliary machine equipment real-time monitoring method and system based on the Internet of Things, and relates to the technical field of information, and the method comprises the steps: constructing a pressure oil pump fault diagnosis model for a temperature and vibration related feature subset, and training a temperature and vibration feature sample of a preset fault type, establishing a mapping relation between the temperature and vibration characteristics of the pressure oil pump and the fault type; on the basis of the pressure oil pump fault diagnosis model, typical faults of bearing abrasion and poor gear meshing of the pressure oil pump are classified and recognized, and the temperature and vibration fault diagnosis result of the pressure oil pump is determined through the mapping relation between the temperature and vibration characteristics of the pressure oil pump and the fault type; and according to the fault diagnosis results of the temperature and vibration of the pressure oil pump, carrying out comprehensive decision making on a plurality of diagnosis results, according to the preset confidence of different diagnosis results, giving corresponding weight coefficients, and generating a final health state evaluation result of the pressure oil pump. The operation reliability and the maintenance efficiency of the pressure oil pump are improved.

A thermal management system having a battery and an electric motor, the temperature of both of which is to be controlled, wherein the electric motor is oil-cooled. The thermal management system has a monitoring system for monitoring an oil flow generated by an oil pump, in an oil cooling circuit including the electric motor. The monitoring system in this case has a first pressure sensor at a first point of the oil cooling circuit and a second pressure sensor at a second point of the oil cooling circuit and / or a speed sensor assigned to the oil pump. Also proposed is a vehicle having a thermal management system of this type.

We provide a lubricating oil filtering and cooling device for a gearbox of a wind turbine generator. [Solution] The cooling assembly includes a circulation box (100) to which an oil discharge pipe communicating with the oil discharge port of the gearbox is attached, an oil pump is attached at its uppermost end, and an oil supply pipe (103) communicating with the oil supply port of the gearbox is connected at its outlet end, a refrigeration pipe (201) and a guide pipe (202) attached within the circulation box, an inner box (203) fixedly connected within the circulation box, and an equalizing member (204) provided within the circulation box, wherein both ends of the guide pipe are respectively connected to the oil pump and the inner box, and the inside of the circulation box is filled with cooling liquid, a filter fixedly connected within the inner box, a cleaning member provided above the filter, and a drive member movably connected to the circulation box.

The invention discloses a gearbox self-lubricating structure with an oil collecting and distributing piece and a lubricating optimization method. The gearbox self-lubricating structure comprises the oil collecting and distributing piece (comprising a main oil collecting groove and an input shaft / gear set lubricating pipeline) arranged in a box body and a side lubricating oil way (an auxiliary oil collecting groove and a guide hole). According to the method, splashing oil is intercepted to the main oil collecting groove through the baffle, the oil level and the boss height are dynamically compared based on the oil throwing amount formula Q = k * b * v * h, and the oil is distributed and directionally dripped into the bearing through the lubricating pipeline. The problems of uneven lubrication, poor speed ratio adaptation and high oil stirring heating in the prior art are solved, an external oil pump is not needed, the energy consumption and the manufacturing cost are reduced, scrap iron is intercepted, the service life of the bearing is prolonged, the high-speed shaft is cooled preferentially, and the low-speed shaft is cooled as required under the full-speed-ratio working condition, and the operation stability of the gearbox is improved.

The invention discloses a sealing dynamic performance experiment test platform which comprises an environment box, an experiment sleeve, a hydraulic oil pump, a high-speed reciprocating device and a leakage detection device, a temperature control device I and a base are arranged in the environment box, a temperature sensor probe is arranged in the base, and the experiment sleeve comprises a left guide sleeve, a shaft sleeve and a right guide sleeve. A left guide sleeve and a right guide sleeve are arranged between the shaft barrel and the base, a seal is arranged between the left guide sleeve and the right guide sleeve, a coaxial through hole is axially formed between the left guide sleeve and the right guide sleeve, a to-be-tested sealing piece is arranged between the shaft barrel and the base, an oil supply pipeline and an oil return pipeline are arranged between the shaft barrel and the base and provided with a seal, and the oil supply pipeline and the oil return pipeline are both communicated with a hydraulic oil pump containing a temperature control device II. The lower portions of the left guide sleeve and the right guide sleeve are respectively provided with an inverted funnel structure and a middle inclined notch. The device can provide single or multi-working-condition combined simulated use working conditions such as high temperature, high pressure, high speed, pulse, low temperature and reciprocation, measure the leakage rate in real time, and realize data measurement and performance evaluation of hydraulic reciprocating dynamic sealing.

The invention belongs to the technical field of petroleum machinery, and particularly relates to a combined type polish rod breakage blowout prevention wellhead device which comprises a valve body, a horizontally symmetrical penetrating cavity is formed in the valve body, the two ends of the cavity are blocked and fixed through glands, and a vertically-penetrating annular channel is further formed in the valve body and allows an oil pumping polish rod to pass through. Two gate plates are further symmetrically arranged in the valve body corresponding to the horizontally-symmetrical penetrating cavity, a rib plate is arranged on one side of the cover plate, and a right-angle rubber base is fixedly connected between the gate plates and the rib plate through bolts. The device can be automatically triggered after the oil pumping polish rod is broken and disengaged, a blowout channel is rapidly sealed, oil well back pressure spraying is prevented, environment pollution caused by crude oil spraying is avoided, and the device has the function of guaranteeing sealing between a wellhead device and the oil pumping polish rod during normal production of a rod-pumped well. And the wellhead device can be isolated from the shaft when the packing is maintained and replaced by the oil extraction system of the pumping unit.

A power transmission device for a vehicle includes a housing that accommodates a power transmission mechanism, a control valve configured to control an oil pressure supplied to the power transmission mechanism, an oil pump configured to supply oil to the control valve, a partition section that divides an interior of the housing into a first chamber that accommodates the power transmission mechanism and a second chamber in which the control valve is arranged upright, and a communication path communicating between the first chamber and the second chamber. An opening area of the communication path is set so that an amount of the oil flowing from the second chamber into the first chamber through the communication path is less than an amount of the oil drained into the second chamber from the control valve while the vehicle is in motion.

The invention discloses intelligent bent pipe punch forming equipment and method, and relates to the technical field of pipe fitting punch forming, the intelligent bent pipe punch forming equipment comprises a machine body and a pipe blank, the machine body is provided with a die mechanism, a pushing mechanism and an elbow core rod provided with a first quick release assembly, and the die mechanism comprises an upper die and a lower die which are fixed to the machine body; the upper die and the lower die are respectively provided with forming runners which are matched with each other, and the tube blank is placed in the forming runner of the lower die. By arranging the pressure feedback mechanism and the lubricating oil spraying mechanism, the friction force between the pipe blank and the elbow core rod is converted into the pressure value change in the pressure detection cavity and transmitted to the piezoelectric sensor, the piezoelectric sensor feeds back the pressure value to the control unit, and the control unit can control the rotating speed of the oil pump according to the pressure value. The larger the friction force between the pipe blank and the elbow core rod is, the higher the rotating speed of the oil pump is, the more lubricating oil is sprayed out of the oil spraying holes, the intelligent degree of lubrication is improved, and the stamping effect is guaranteed.

The invention discloses an oil pumping unit transmission flexible connection fault diagnosis method based on big data and artificial intelligence. The oil pumping unit transmission flexible connection fault diagnosis method sequentially comprises the following steps of S1, collecting monitoring data related to oil pumping unit transmission flexible connection; s2, preprocessing the collected monitoring data; s3, a traditional machine learning method and a deep learning technology are fused, and an oil pumping unit transmission flexible connection fault early warning model is established; s4, analyzing the real-time monitoring data of the flexible connection by using the fault early-warning model, quickly judging abnormal conditions in the real-time monitoring data, making a fault early-warning and analysis report, and providing the fault early-warning and analysis report to a manager; and S5, continuously monitoring and optimizing the early warning model. According to the fault diagnosis method, through data management, an intelligent algorithm and model analysis, the transmission flexible connection state of the oil pumping unit is monitored in real time, potential faults are predicted and diagnosed in advance, and an alarm is given in time when a belt of the oil pumping unit or a steel wire rope of a beam hanger is broken, so that the production efficiency and safety of an oil well are improved, and construction of an intelligent oil field is assisted.

The invention discloses an oil pump state detection technology, and aims to provide an oil pump state detection system based on deep learning and a detection method thereof, and the key points of the technical scheme are that the oil pump state detection system comprises the following modules: a data collection module used for collecting operation data of an oil pump in real time; the data preprocessing module is used for processing the collected original operation data; the deep learning model training module is used for training the preprocessed data through a back propagation algorithm by adopting a convolutional neural network architecture, so that the model can learn the characteristics of the normal state and the fault state of the oil pump; the state detection module is used for classifying the data by utilizing the trained deep learning model when monitoring the operation data of the oil pump in real time, outputting the current state of the oil pump and judging whether an abnormity or a potential fault exists or not; when the fault early warning module detects that the oil pump is abnormal or has a potential fault, an early warning signal is sent out in time; the method is suitable for the technical field of oil pump state detection.

A spray oil cooling device for a stator core periphery of an electric drive unit in a motor vehicle comprising an oil pump for providing a cooling oil mass flow and an oil line for guiding the cooling oil mass flow starting from the oil pump to at least one first oil spray area at stator winding heads of a first stator end face, and at least one second oil spray area at stator winding heads of a second stator end face, wherein the oil line is designed to guide the cooling oil mass flow between the first and the second oil spray area, remote from a stator core cooling sleeve.

The invention relates to the technical field of bearings, in particular to a rotary table bearing internally provided with an oil cooling structure, which comprises a rotary table bearing and is characterized in that the rotary table bearing comprises an outer ring, and an inner ring is rotatably arranged in the outer ring; a rolling body used for supporting the outer ring and the inner ring and allowing the inner ring to rotate relative to the outer ring is arranged between the outer ring and the inner ring, a retainer used for keeping the position of the rolling body is movably connected to the rolling body, and an oil cooling channel used for the rotary table bearing is formed in the outer ring or the inner ring. An inlet and an outlet for cooling oil to enter the oil cooling channel are formed in the two ends of the oil cooling channel, a cooling pipeline is communicated with the position, located outside the rotary table bearing, between the inlet and the outlet of the oil cooling channel, an oil pump is communicated with the cooling pipeline, and a cooling assembly is arranged on the cooling pipeline. It is ensured that the bearing can still be effectively cooled under long-time and high-load operation, the service life of the rotary table bearing can be prolonged, and the maintenance cost and the replacement frequency are reduced.

The invention relates to the field of blast furnace pulverized coal preheating. A blast furnace pulverized coal preheating system comprises a coal injection workshop, a nitrogen heater, a common pulverized coal heater, a compressed nitrogen tank, a blast furnace, an oil storage tank, an expansion tank, a waste heat exchanger, a heat conduction oil pump, a PLC control system and a sound-light alarm device. Pulverized coal discharged from a coal injection workshop is heated in a common pulverized coal heater through waste heat of a blast furnace, and the heated pulverized coal enters the blast furnace to be combusted. The combustion characteristic of the preheated pulverized coal is remarkably improved, and the pulverized coal can be quickly combusted after entering a main combustion chamber of the blast furnace, so that the conventional three-section combustion process of heating, ignition and combustion is broken through.

The multi-compressor refrigeration system comprising a controller and a multi-compressor device including at least three compressors which are coupled in parallel, each compressor equipped with an oil sump and an oil level detection device, the compressors divided into two groups each including at least one compressor; suction fittings of the compressors that are fluidly connected by a common suction line and oil sumps that are fluidly connected by a common oil equalization line. The multi-compressor device includes an oil pumping device located in the common oil equalization line and between the two groups, and at least one valve located in the common oil equalization line and configured to control an oil flow between the oil pumping device and at least one compressor of a group associated with the at least one valve.

The invention discloses a high-pressure oil pump fault early warning method, system and device, and relates to the technical field of marine diesel engine fault diagnosis. The early warning method comprises the steps of obtaining sample data of a high-pressure oil pump in response to a stable-pressure working condition of the high-pressure oil pump; the sample data comprises the front end temperature and the rail pressure of the high-pressure oil pump; inputting the sample data into a pre-trained early warning model to obtain detection parameters; and generating early warning information in response to the fact that the detection parameter is greater than the first threshold. Therefore, by monitoring the front-end temperature and the rail pressure of the high-pressure oil pump and inputting the data into the pre-trained early warning model, online fault early warning of the high-pressure oil pump can be achieved, potential fault conditions can be found early, further deterioration of the faults is avoided, the downtime and the maintenance cost are reduced, and the reliability and the stability of the diesel engine are improved. And secondly, by generating the detection parameter and the first threshold value, when the detection parameter exceeds the first threshold value, the early warning information is generated, so that the accuracy of fault detection is improved, and the situations of false alarm and missing alarm are reduced.

The invention relates to an aircraft electric drive oil cooling structure which comprises an outer rotor assembly, a stator assembly, a controller assembly, an oil pump and a heat dissipation assembly, the stator assembly comprises a stator shell and a winding, a sealing cover is further fixed to the outer side of the winding, and a cooling cavity is formed between the sealing cover and the stator shell; a bottom plate is further arranged at the bottom of the stator shell, the controller assembly is fixed in a mounting cavity formed by the bottom plate and the stator shell and comprises a circuit board and a cooling plate which are close to each other, the circuit board is connected with the winding, an oil duct A is further arranged on the bottom plate, an oil inlet pipe and an oil outlet pipe are arranged on the cooling plate, and an oil duct B communicated with a cooling cavity is further arranged on the bottom plate; the heat dissipation assembly comprises a heat dissipation fin set and a fan assembly, the heat dissipation fin set and the oil pump are both fixed to the lower portion of the bottom plate, heat dissipation fins form a ring and are arranged outside the oil pump in a surrounding mode, the heat dissipation fin set, the oil pump and the bottom plate are communicated with one another, and the fan assembly is fixed to the lower portion of the heat dissipation fin set. Efficient, light-weight, high-integration-level and reliable heat dissipation of the electric drive of the aircraft is achieved.

The invention discloses a hydraulic engineering pipeline butt welding device, and relates to the technical field of pipeline butt welding. The hydraulic engineering pipeline butt welding device comprises a welding table, the top of the welding table is provided with a fixed clamping seat and a sliding clamping seat driven by an electric push rod, the interior of the welding table is rotationally connected with a rotating plate, the interior of the rotating plate is provided with a welding gun driven by the electric push rod, and the sliding clamping seat is slidably connected with a clamping plate; a clamping assembly is arranged on the welding table and comprises a first hydraulic bin, and an oil pump is assembled at one end of the first hydraulic bin. According to the hydraulic engineering pipeline butt welding device, an oil pipeline is assembled on the oil pump, the oil pump is started, and the first hydraulic bin, the oil pump, the connecting rod, the second hydraulic bin, the stress block, the arc-shaped block, the torsional spring rod and the friction plate are matched, so that when the pipeline is clamped, the overall stability of the device is improved, and the subsequent butt operation of the device is more stable.

The invention relates to an electric drive assembly and a vehicle, and belongs to the technical field of electric drive assemblies. The electric drive assembly comprises a motor assembly, a speed reducer shaft tooth assembly and a cooling lubricating oil way, the motor assembly is in transmission connection with the speed reducer shaft tooth assembly, the motor assembly and the speed reducer shaft tooth assembly are each provided with a matched bearing set, and the cooling lubricating oil way comprises an oil pumping assembly, a main oil way, a branch oil way, an oil spraying pipe and a plurality of bearing lubricating oil ways. The oil pumping assembly is used for pumping oil to the main oil way, the branch oil ways and the oil spraying pipe communicate with the main oil way, and the bearing lubricating oil ways correspond to bearings in the bearing pack one to one. Wherein the branch oil way is used for outputting oil liquid to the motor assembly, the oil spraying pipe is provided with a plurality of first oil spraying openings, and the first oil spraying openings correspond to a plurality of bearings in the bearing set, so that the oil liquid can be sprayed to the corresponding bearings from the first oil spraying openings to form corresponding bearing lubricating oil ways. According to the electric drive assembly, a cooling lubricating oil way in the electric drive assembly can be simplified.

The utility model discloses a pipeline reducing device which comprises a working platform, an adjusting assembly, a clamping assembly, a reducing assembly and a reducing die are arranged on the working platform, the working platform is provided with a collecting opening, the collecting opening is located below the reducing die, the lower portion of the collecting opening is communicated with an oil tank, the oil tank is provided with an oil pump, the oil pump is communicated with the oil tank and a spray pipe, and the spray pipe extends into the reducing die. According to the pipeline reducing device, the adjusting assembly and the necking assembly are adopted, pipes with different lengths can be limited, the clamping assembly is matched, the pipe can be clamped, the device adapts to the pipes with different pipe diameters, the middle of the pipe can be supported, and the pipe is prevented from being bent and deformed due to large extrusion force; and a collecting opening, an oil tank, an oil pump and a spraying pipe are adopted, lubricating oil can be sprayed into the necking die, redundant lubricating oil flowing out of the necking die is collected and recycled, the machining environment is kept clean, and resources are saved.

The invention belongs to the technical field of motor control, and provides an oil pump rotating speed self-adaptive control method and system.The method comprises the steps that the motor rotating speed, the motor temperature, the motor torque and a current signal are obtained; judging whether the motor rotating speed, the motor temperature, the motor torque and the current signal meet requirements or not; if any item does not meet the requirement, the oil pump operates at the fault rotating speed; and if so, adjusting the rotating speed of the oil pump and recollecting the temperature of the motor. In the process of outputting the final rotating speed of the oil pump, the motor temperature is controlled to be below the target temperature value, the corresponding oil pump rotating speed is obtained, then whether the oil pump leaks oil or not is diagnosed, a corresponding strategy is executed according to the oil leakage condition, and finally the final oil pump rotating speed is output. According to the process, the working conditions of the oil pump under different working conditions are fully considered, so that the oil pump meets the motor cooling and lubricating requirements, and meanwhile, the operation rotating speed selection is more reasonable.

The invention discloses a rotating speed control method and system for an electronic oil pump of a dual-motor hybrid power system and a vehicle, relates to the technical field of vehicle energy, and is used for solving the problem that the power consumption of the electronic oil pump is high in the related art. The method comprises the steps that if a motor does not have a locked-rotor fault, the temperature of the motor and the temperature of lubricating oil in an oil pan are collected; if the temperature of the lubricating oil is larger than or equal to a preset first temperature threshold value and the temperature of the motor is smaller than or equal to a preset second temperature threshold value, the cooling demand flow of the motor, the shaft tooth lubricating flow and the actual output flow of a mechanical oil pump under the current working condition are obtained; obtaining the required total flow according to the cooling required flow and the shaft tooth lubricating flow of the motor; if the difference value between the required total flow and the actual output flow is larger than zero, the rotating speed of the electronic oil pump is adjusted and controlled according to the difference value and the lubricating oil temperature.

The invention discloses a piston type compressor driven by liquid pressure, which is characterized in that hydraulic and gas compression components are integrated in a cylinder body, a crankshaft rotates to drive a hydraulic piston, then a gas piston is driven by utilizing the characteristic that liquid cannot be compressed, the upper part of the gas piston is filled with sealing liquid, a gap of a sealing ring is filled, and gas leakage is reduced. According to the structure, lubricating and hydraulic media can be combined into a whole, hydraulic oil is stored through the crankcase and serves as the lubricating media, and the equipment size is further reduced in the mode that an oil pump is arranged inside. And meanwhile, a multi-stage compression form can be combined, so that the discharge pressure is further improved. The invention can be used for high-pressure hydrogen filling piston type compressors of gas stations and energy storage stations, and can also be used in the field of other high-pressure and ultrahigh-pressure gas compressors.

The invention belongs to the technical field of new energy engineering machinery, and particularly relates to a self-adaptive PID (Proportion Integration Differentiation) regulation oil pump control method and system for engineering machinery. According to the invention, the oil pump motor is controlled by simulating the voltage speed regulation system and adopting the PID control panel voltage output, and the control is optimized by collecting the use information, so that the long-time low-efficiency operation of the motor in the use process is avoided, the system obtains the optimal control performance, and the operation of the oil pump motor with the optimal efficiency is realized.

The invention discloses a low-loss double-reverse-star rectifier transformer for a hydrogen production system, and relates to the technical field of double-reverse-star rectifier transformers, the low-loss double-reverse-star rectifier transformer comprises a box body, cooling fins, a coil, a connector lug, a supporting box and a cooling module, the cooling fins are installed on the outer wall of the box body, the coil is installed on the inner wall of the box body, the connector lug penetrates through the top of the box body, and the supporting box is arranged in the box body. One end of the connector lug is connected with the outer wall of the coil, and a supporting box is installed on the outer wall of the box body. The oil pump is started to suck transformer oil in the box body into the continuous bow-shaped pipe, at the moment, the first fan is started to generate wind power to blow to the surface of the continuous bow-shaped pipe, so that the transformer oil in the continuous bow-shaped pipe is cooled, and the cooled transformer oil enters the box body again through the discharge head; at the moment, a first motor rotates to drive a first beating head to rotate, the first beating head rotates to drive a T-shaped frame to move, the T-shaped frame moves to drive a first spring to move, and the first spring moves to enable the T-shaped frame to drive a ram to move.

The invention relates to the technical field of transformer coolers, in particular to a transformer cooler cooling efficiency monitoring system and method and a program product, and the method comprises the steps: obtaining an inlet oil temperature, an outlet oil temperature, an environment temperature, an actual flow, a load current and a vibration signal of a cooler; calculating the initial cooling efficiency of the cooler; calculating the total thermal load of the transformer based on the load current; calculating a vibration health index of the cooler oil pump based on the vibration signal; correcting the initial cooling efficiency in combination with the total heat load and the vibration health index to obtain final cooling efficiency; according to the method, the evaluation accuracy of the cooling efficiency of the transformer is improved by integrating real-time monitoring of various parameters, the running state of the cooler can be reflected more accurately, transformer faults caused by insufficient cooling are effectively prevented, the service life of equipment is prolonged, and the maintenance cost is reduced.

The invention discloses an ultrasonic detection device for on-site detection of a large pressure vessel, which comprises an ultrasonic probe, an ultrasonic flexible track coating mechanism, a vacuum chuck fixing device, an along-track oil filling pushing device, a vertical track pushing device and a controller, and is characterized in that the ultrasonic probe is arranged in the ultrasonic flexible track coating mechanism; the two ends of the ultrasonic flexible track wrapping mechanism are tightly attached to the outer wall of the pressure container through vacuum suction cup fixing devices, the bottom face, making contact with the wall of the pressure container, of the ultrasonic flexible track wrapping mechanism is coated with oil and tightly attached to the wall of the pressure container without air, and the interior of a track of the ultrasonic flexible track wrapping mechanism is filled with oil. A micro oil pump in the along-track oil filling pushing device is used for achieving slow displacement motion of an ultrasonic probe in the direction of a flexible track, the outer side of an ultrasonic flexible track coating mechanism is tightly buckled with a flexible track coating belt clamping sleeve, and the side wall of the flexible track coating belt clamping sleeve is connected with a vertical track pushing device. The thrust motion perpendicular to the track is provided by controlling the motion of the stepping motor, and internal cracks possibly appearing at the welding seam of the pressure container are detected. The method can achieve the automatic fine detection of a local region, and is suitable for the multi-time repeated detection of the same region.

A constant-flow control valve group, an auxiliary arm control module, a complete hydraulic system, and a crane. The constant-flow control valve group comprises: a cartridge valve; a cartridge reversing valve, comprising a working oil port on one side and a main oil return port and a reversing valve oil inlet selectively connected to the working oil port on the other side, the working oil port being connected to a control oil port of the cartridge valve, and the reversing valve oil inlet being connected to a main oil inlet of the cartridge valve; and a feedback on-off valve, disposed in a working feedback oil path connected between the main oil inlet of the cartridge valve and a main feedback oil port of the constant-flow control valve group. The auxiliary arm control module comprises the constant-flow control valve group and a main reversing valve. The complete hydraulic system comprises the auxiliary arm control module and an auxiliary arm luffing cylinder, and may further comprise a load-sensitive oil pump and a main valve. The present application can achieve the effect of directly connecting an auxiliary arm hydraulic system to an existing complete hydraulic system as a sub-module without altering the original system.

The invention discloses an outburst coal seam crossing drilling pipe-pushing type hydraulic cave-making and spray-eliminating drilling tool which comprises a pipe-planting drill bit, a pipe-pushing and spray-eliminating device, a pipe-pushing jet device, at least one pipe-pushing drill rod and a pipe-pushing hollow water braid which are connected in sequence. A flow supply channel flowing towards the pipe planting drill bit and an exhaust pipe planting channel with the flow direction opposite to that of the flow supply channel are arranged in the pipe planting drill bit, the pipe pushing spray eliminating device, the pipe pushing jet device, the pipe pushing drill rod and the pipe pushing hollow water braid. The hydraulic drilling machine has the beneficial effects that the mode of controlling axial flow supply of a drill bit and radial flow supply of a nozzle through water pressure of a pump is abandoned, switching between axial flow supply and radial flow supply is achieved through an oil pump of the hydraulic drilling machine and a hollow oil cylinder of a hollow water braid of a push pipe, and the hydraulic drilling machine is not affected by the water pressure, the drilling depth and the gas-water pressure in a loose hole gas pocket; radial cave forming can be achieved through water pressure of a clear water pump station, radial cave forming can be achieved through hydrostatic pressure if a soft outburst coal seam occurs, and accurate switching can be achieved.

The utility model discloses a walking hydraulic system and a shear fork type lifting working platform. The system comprises a hydraulic oil tank, an oil pump, a first motor, a second motor, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a third electromagnetic reversing valve, a fourth electromagnetic reversing valve, a first balance valve, a second balance valve and a flow distributing and collecting valve. An original two-position four-way electromagnetic directional valve is replaced by the third electromagnetic directional valve and the fourth electromagnetic directional valve, and the flow distributing and collecting valve is additionally arranged, so that the flow of the two motors is evenly distributed during low-speed walking, and the problems that long-distance linear walking cannot be achieved, and slipping and weakness are prone to occurring during low-speed walking are solved; the flow collecting opening of the flow distributing and collecting valve is connected with the second electromagnetic directional valve in parallel, oil ways are switched through the second electromagnetic directional valve without passing through the flow distributing and collecting valve, and the problems of high system pressure and high energy consumption caused by the fact that oil flows through the flow distributing and collecting valve during high-speed walking are solved.

The invention relates to the technical field of transformers, and provides an intelligent energy-saving transformer which comprises heat dissipation equipment which comprises an inner heat dissipation cylinder arranged between a primary winding and an E-shaped silicon steel sheet, a middle-layer heat dissipation cylinder arranged between the primary winding and a secondary winding and an outer heat dissipation cylinder arranged outside the secondary winding. The transformer oil in the oil tank is conveyed into the circulating grooves in the inner heat dissipation cylinder, the middle heat dissipation cylinder and the outer heat dissipation cylinder through the oil pump, the inner heat dissipation cylinder, the middle heat dissipation cylinder and the outer heat dissipation cylinder conduct heat on the iron core body, the primary winding and the secondary winding, the transformer oil absorbs heat, and heat dissipation is conducted through the heat dissipation fins outside the oil tank; according to the transformer, centralized heat dissipation of the interior of the transformer is achieved, transformer oil does not make direct contact with the iron core body, the primary winding and the secondary winding, the leakage risk is greatly reduced, meanwhile, the weight of the transformer is reduced, the heat dissipation effect is good, and meanwhile safety is high and maintenance cost is low.