31results about How to "No oil leakage problem" patented technology

The invention provides a pulse condition stimulator, comprising a base plate; a water storage tank fixedly arranged on the base plate with water therein and provided with a plurality of water inlets and water outlets; and a plurality of water pumps fixedly arranged on the base plate in rows. Each water pump is provided with a water inlet and a water outlet. The water outlets of the water storage tank are connected with the water inlet of each water pump. The water outlet of each water pump is connected to a pulse condition synthesizing voltage-stabilizer. The pulse condition synthesizing voltage-stabilizer includes at least one water return mouth in connection with the water inlets of the water storage tank. A solenoid value is arranged between the water outlet of each water pump and the pulse condition synthesizing voltage-stabilizer. The stimulator also comprises a stimulated arm. The stimulated arm is provided with a stimulated blood vessel. One end of the stimulated blood vessel is connected with the pulse condition synthesizing voltage-stabilizer and the other end is connected with the water inlets of the water storage tank. The stimulator of the invention utilizes distilled water to stimulate blood, which overcomes the problem of an existing stimulator with oil leakage and at the same time, is capable of stimulating complex pulse condition waveforms. The stimulator is also highly accurate.

The invention provides a bird-strike resistant aircraft external auxiliary fuel tank leading edge structure. The bird-strike resistant aircraft external auxiliary fuel tank leading edge structure comprises a fairing, a buffering baffle, a plug body, a front section skin I and a front section skin II, wherein the fairing is a variable-section thick wall structure; the front section skin I is connected with the fairing through a connecting piece so as to ensure that the assembling gradient between the front section skin I and the external surface of the fairing is less than 1 mm; and the buffering baffle is positioned behind the fairing and used for separating the front section skin I from the fairing so that fuels in the front section skin I and a rear structure of the front section skin I cannot enter the fairing. The invention is advantaged in that the structural design of the bird-strike resistant aircraft external auxiliary fuel tank leading edge structure is simple, and the bird-strike resistant aircraft external auxiliary fuel tank leading edge structure is very convenient to manufacture and assemble, can effectively resist flying bird strike and can also ensure that an auxiliary fuel tank cannot suffer a fuel leakage problem or a part fall-off problem to affect the flying safety of an aircraft.

The invention discloses an electric power steering system of a large commercial vehicle. The system comprises a steering transmission shaft, a steering knuckle arm, a telescopic electric power steering device and a steering electronic control unit. The telescopic electric power steering device comprises an input shaft connected with the steering transmission shaft, a large steering gear connectedwith the input shaft, a small steering gear meshed with the large steering gear, a power-assisted motor, a small power-assisted gear connected with the power-assisted motor, a large power-assisted gear meshed with the small power-assisted gear and coaxially connected with the small steering gear, a ball screw mechanism connected with the large power-assisted gear, and a steering outer pull rod connected with the ball screw mechanism and the steering knuckle arm. The electric power steering system of the large commercial vehicle is high in integration level and convenient to arrange, and no complex oil ways and oil way accessories need to be assembled; and the steering function requirements of auxiliary driving and automatic driving can be met. The invention further discloses a control method of the electric power steering system of the large commercial vehicle.

The invention discloses uniform oiling equipment for automatic oiling of a lead screw. The equipment comprises an oil drum and an air pump connected with the oil drum, and further comprises a PLC control system, a feeding mechanism used for feeding a lead screw provided with a turbine, a transmission mechanism used for driving the lead screw to rotate, an oiling mechanism used for evenly oiling the lead screw, and a collecting mechanism used for cleaning residual waste oil after oiling of the lead screw, the oiling mechanism is provided with a sliding rail, a sliding block, an oil gun arrangedon the sliding block, a first linkage device used for achieving overall movement of the sliding block and a switch used for controlling opening or closing of the oil gun. The equipment realizes automatic oiling and uniform oiling of the screw rod.

The invention discloses a pod rain-line type damper suitable for a stay cable. The damper is wound on a stay cable tightly and closely and comprises a protective sleeve, a metal woven layer, cabin partition boards and particles enclosed in cabins. A rope-type cavity is formed by the metal woven layer. The cabin partition boards divide the cavity into a plurality of small cabins, and particles with different particle diameters are evenly distributed in each small cabin. The protective sleeve is coated outside the entire rope-type cavity. The pod rain-line type damper suitable for the stay cable has the advantages that vibration energy of the stay cable can be consumed through the forms such as motions of the particles in the pod rain-line type damper, collisions and frictions between the particles and collisions and frictions between the particles and cabin walls, so that the aim of vibration attenuation of the stay cable is achieved. Due to the fact that the pod rain-line type damper is wound on the stay cable tightly and closely, the aim of damaging of rain lines on the stay cable is achieved. Wind and rain vibrations of the stay cable can be reduced effectively. At the same time, internal damping of the stay cable is increased, so that vibrations in other forms are reduced.

The invention relates to an electric control mechanism for damping plate of stalled blade in wind turbine, belonging to wind power generation area, characterized in that the guide head of lead screw is located in guide cylinder and connected with the lead screw, the lead screw is connected with nut and the nut is connected with the rotor of permanent magnet motor. There are no pressure and no leakage in the electric control mechanism for wind turbine. The electric control mechanism can not be influenced by climate and the maintenance cost is decreased greatly. The mechanism has big torque. When it does not act, there is no need to electrify to lock the damping plate tightly by big self-locking torque and electric energy exhausted for maintaining locking the damping plate is saved. The control circuit can be sent to actuator mechanism by electric collection ring. Compared with sending the control circuit to the actuator mechanism by hydraulic rotating joint, it is cheaper, simple and stable. The invention can adjust the torque and the speed automatically in random and it is the ideal control mechanism for damping plate of stalled blade in wind turbine.

The invention relates to a modification method of a breaker, and particularly relates to a modification method of a high-voltage breaker. Through the modification method, the modified vacuum breaker has the effects that: after partial 10kV breakers for urban power supply are replaced, the overloading condition of the breaker is eliminated, the power failure times and overhaul times are reduced, and the power supply reliability is enhanced; the vacuum breaker is replaced, thus the workload and labor intensity of the maintainers are greatly reduced and the overhaul and maintenance costs are saved; the oil leakage problem of the vacuum breaker is avoided, the defect condition of the equipment is reduced, and the maintenance workload is reduced; and after the vacuum breaker is replaced, the operational reliability of the equipment is increased and the safe operation coefficient of the power grid is increased.

A normal-temperature self-gas-sealing device for a bearing comprises a static seal part, a movable seal part and the bearing. The static seal part comprises a bearing pedestal bottom cover and a bearing pedestal upper cover. The bearing pedestal bottom cover is composed of a bottom plate inner lip part, a bottom plate outer lip part and a bottom plate. The bearing pedestal upper cover is composed of an upper cover inner lip part, an upper cover outer lip part and a connection plate. The upper cover outer lip part and the bottom plate outer lip part are connected in an extending manner. A lubrication chamber used for storing lubricating oil is formed between the bearing pedestal bottom cover and the bearing pedestal upper cover. The movable seal part comprises a shaft lip part A and a shaft lip part B which are arranged on a stirring shaft in a sleeving manner. The shaft lip part A is located between the bottom plate inner lip part and the bottom plate outer lip part in the radial direction. The shaft lip part A, the bottom plate outer lip part and the upper cover outer lip part are buckled in a staggered manner in the axial direction. The shaft lip part B and the upper cover inner lip part are buckled in a staggered manner in the axial direction. The upper cover inner lip part is located in the shaft lip part B. The bearing is located between the bottom plate inner lip part and the shaft lip part A in the radial direction. The normal-temperature self-gas-sealing device can be suitable for high-sped or low-speed stirring reactions and can be suitable for both inert gas shielding reactions and reaction systems with toxic and harmful gas.

The invention provides an online energy-saving system with two independent hydraulic stations. The online energy-saving system comprises a first hydraulic station and a second hydraulic station, wherein a first pipeline is arranged between an energy accumulator header pipe of the first hydraulic station and an energy accumulator header pipe of the second hydraulic station, and a valve M1 is arranged on the first pipeline; an oil return pipeline of the first hydraulic station is connected with an oil return pipeline of the second hydraulic station through a second pipeline, and a valve M2, a valve M3 and a valve M4 are arranged on the second pipeline, the first hydraulic station and the second hydraulic station separately; a third pipeline is arranged between the oil return pipeline and anoil discharge pipeline of the first hydraulic station, a fourth pipeline is arranged between the oil return pipeline and an oil discharge pipeline of the second hydraulic station, and a valve M7 and avalve M6 are arranged on the third pipeline and the fourth pipeline separately; and a valve M8 and a valve M5 are arranged on the oil discharge pipeline of the first hydraulic station and the oil discharge pipeline of the second hydraulic station separately. The online energy-saving system with the two independent hydraulic stations has the beneficial effects that one hydraulic station can be used for two production lines by only switching on or switching off the valves, the design is ingenious, the structure is simple, the oil expelling problem does not exist when power is supplied after combination, and energy saving is achieved finally; and the production efficiency can be guaranteed, and one hydraulic station can be used as a standby machine.

A control unit of hydraulic press for making the pressing part reach the working position automatically is composed of a two-position two-way return oil valve, dual-control check valve and hydraulic one-way valve. It features that it cylinder has a lower cavity with a low-pressure energy accumulator and an upper cavity with a high-pressure energy accumulator, its operating handle is arranged in a tubular holder to which a power arm for driving oil pump is fixed, and a universal coupling is used to control said return oil valve.

The invention discloses a steering system of a new energy commercial vehicle, which comprises a steering wheel, a column tube with an intermediate shaft assembly, a steering gear, a steering plumbing arm, a steering straight pull rod, a left steering knuckle, a right steering knuckle and a transverse pull rod arranged between the left steering knuckle and the right steering knuckle and further comprises a pair of connecting pull rods. The steering straight pull rod is hinged with the steering knuckle at one side. The steering knuckle on each side is hinged to the butt joint end of the transverse pull rod through a corresponding connecting pull rod, and an electric power assisting structure is arranged on the steering gear. The electric recirculating ball type steering system adopting the disconnected steering trapezoidal structure can provide larger assisting power compared with an electric gear rack type steering gear, can provide reliable steering assisting power for a vehicle with the front axle load of 1.6-3 tons, and does not need to adopt a high-price electric hydraulic pump, so that the cost of parts of the system is low, high energy consumption required by the electric hydraulic pump is avoided, and due to the absence of steering fluid, the problems of oil leakage and oil seepage do not exist; and stability and reliability are realized.

The invention discloses a monorail crane control device. The monorail crane control device comprises a mounting plate, an operating handle, a position sensor, a data acquisition circuit, a processor,a data transmission module and a power supply module. The operating handle is mounted on the mounting plate. The position sensor is mounted on the operating handle. The data transmission module is used for filtering analog signals of the position sensor and converting the analog signals into digital signals. The processor is used for converting the digital signals into corresponding operating commands and transmitting the operating commands to a controller for a monorail crane through the data transmission module. The power supply module is used for supplying power to the position sensor, thedata acquisition circuit, the processor and the data transmission module. Compared with a traditional hydraulic operating device, the monorail crane control device has the advantages that operation iseasy to conduct, the structure is simple, the weight is small, and the oil seepage and leakage problems are avoided; and compared with the mode that the control commands are transmitted in the analogform, the antijamming capability is great, and working performance is stable.

The invention discloses a new energy commercial vehicle steering system which comprises a steering wheel, a column tube with an intermediate shaft assembly, a steering gear, a steering plumbing arm, a steering straight pull rod, a left steering knuckle, a right steering knuckle and a transverse pull rod arranged between the left steering knuckle and the right steering knuckle and further comprises a pair of connecting pull rods. The steering straight pull rod is connected with the steering knuckle on one side in a hinged manner, the knuckle on each side is hinged to the butt joint end of the transverse pull rod through the corresponding connecting pull rod, and an electric power assisting structure is arranged on the steering gear. The electric recirculating ball type steering system adopting the disconnected steering trapezoidal structure can provide larger assisting power compared with an electric gear rack type steering gear, can provide reliable steering assisting power for a vehicle with the front axle load of 1.6-3 tons, and does not need to adopt a high-price electric hydraulic pump, so that the cost of parts of the system is low, high energy consumption required by the electric hydraulic pump is avoided, due to the absence of steering fluid, the problems of oil leakage and oil seepage do not exist; and stability and reliability are realized.

The invention discloses a pneumatic punching-riveting device and relates to the technical field of punching. The pneumatic punching-riveting device comprises a body, pistons, springs and an adjusting screw; a station containing a work-piece to be punched and riveted is arranged in the body, and the adjusting screw is arranged on the bottom of the station for vertically adjusting the position of the work-piece to be punched and riveted from the bottom; guide grooves are formed in the body, the pistons and the springs are arranged inside the guide grooves, the pistons face the position to be punched and riveted of the work-piece to be punched and riveted, and the springs are arranged at the front ends of the pistons and are used for enabling the pistons completing the punching-riveting work to be reset; air channels are formed in the body and communicate with the guide grooves, and high-pressure gas in the air channels enter the guide grooves for impacting the pistons and enabling the pistons to execute the punching-riveting work. According to the device, use of hydraulic structures is avoided, and oil leakage is avoided. In addition, the pneumatic punching-riveting device is safe, reliable, simple in structure, convenient to operate, capable of carrying out the punching-riveting work in multiple directions and high in efficiency.

The invention discloses a far infrared intelligent warmer and a control circuit thereof. The warmer comprises multiple radiating fins arranged in parallel, an electric cabinet mounted at the front ends of the radiating fins and heating bodies located in the radiating fins, wherein the upper part of the radiating fins is hinged with a pair of handles convenient to carry and for hanging clothes; a base is arranged at the lower part of the radiating fins; the electric cabinet is provided with a control circuit for controlling the heating of the radiating fins; and the control circuit comprises a control module, a display module, a key module, a room temperature sampling thermistor, a radiating fin temperature sampling thermistor, a full-power and half-power switch module and a heating body group. The warmer disclosed by the invention has the characteristics of simple structure, short preheating time, low manufacturing cost, long service life, light weight and the like, and is convenient to use, safe and reliable, low-carbon and healthy and energy-saving and environment-friendly.

The invention provides a damping-adjustable front wheel shimmy damper for small and medium-sized unmanned aerial vehicles. The damping-adjustable front wheel shimmy damper comprises a connecting rod, a sliding rod, an outer cylinder, a first adjusting blanking cap, a first spring, a first check ring, a second adjusting blanking cap, a second spring and a second check ring. The connecting rod is in threaded connection with the sliding rod, the sliding rod penetrates into the outer cylinder, the first spring and the second spring are arranged in a gap between the sliding rod and the outer cylinder, the first check ring and the second check ring are arranged between the first spring and the second spring, and the first adjusting blanking cap and the second adjusting blanking cap are connected with the two ends of the outer cylinder through threads. According to the shimmy damper, a force transmission gap is eliminated, forward / backward pre-damping can be adjusted, adjustment is convenient and fast, the shimmy damper is simple in structure, low in machining and manufacturing cost, small in size and light in weight, the cylinder is not filled with oil, the problem of oil leakage of a traditional oil shimmy damper is solved, and the manufacturing and maintenance cost is reduced.

The invention discloses an electronic cigarette atomizer, and belongs to the technical field of electronic cigarettes. The electronic cigarette atomizer comprises an atomizer body, an oil storage area, an atomization area, a transfer area and a suction area are sequentially arranged in the atomizer body from one end to the other end, the oil storage area is arranged in a sealed mode, the oil storage area and the atomization area are communicated through a plurality of atomization cores, the oil storage area and the atomization area of the atomizer body are made of a heat conduction material, and an air inlet hole is formed in the side wall of the transfer area. The electronic cigarette atomizer is novel in structure and high in practicability. After the atomizer body is inserted into a heater silica gel ring to be sealed, the whole oil storage area and the whole atomization area are in a sealed state, negative pressure is generated during suction to open an airflow switch of the atomization area, atomized tobacco tar enters the transfer area, the oil storage area and the atomization area are in a sealed state at other times, and the tar leakage problem does not exist. The outer wall of the smoke cartridge is heated through the periphery of the smoke cartridge to indirectly transfer heat to the atomization core, the heating wire can be prevented from making direct contact with the atomization core to cause charring, and meanwhile heat conduction is more uniform.

The invention discloses an electric power steering system for medium and large commercial vehicles, which comprises a telescopic electric power steering device, the telescopic electric power steering device comprises a steering mechanism assembly and an output mechanism assembly, and the output mechanism assembly comprises a power motor and a ball screw mechanism. The steering mechanism assembly comprises a steering gear and a steering worm which are meshed with each other, the output mechanism assembly further comprises a power-assisted gear and a power-assisted worm which are meshed with each other, the power-assisted worm is connected with the power-assisted motor, the power-assisted gear is connected with the steering worm and the ball screw mechanism, the steering gear is a worm gear or a bevel gear, and the power-assisted worm is connected with the power-assisted motor. The booster gear is a worm gear or a bevel gear. According to the electric power steering system for the medium and large commercial vehicles, the action noise is low during steering, the steering wheel is smooth and free of impact action sound during reversing, the driving experience is good, and the comfort level is high.

The present invention is one kind of centerpiece gimbal with improved structure and thus simple manufacture, light running and less noise and suitable for high speed and light load running. Between the outer ring and the centerpiece head, homogeneous circular soft wear resisting layer is formed through coating nylon material onto the inner wall and the bottom of the centerpiece outer ring. In case that there is inclined annular overtravel slot between the inner wall and the bottom, the overtravel slot is coated with soft wear resisting layer. Annular slot in the root part of the centerpiece head is filled with the soft wear resisting layer. The present invention has the features of simple structure, easy manufacture, compact structure, low running noise, etc. and is especially suitable for high speed and low load centerpiece gimbal.

The invention discloses a hydraulic ejection structure of a plastic mold. The hydraulic ejection structure comprises an oil hydraulic cylinder arranged on a mold foot of the plastic mold, an oil way arranged in the mold foot and communicated with the oil hydraulic cylinder, and a connecting rod; and one end of the connecting rod and a stretchable end of the oil hydraulic cylinder are fixed, and the other end of the connecting rod and an ejection plate of the plastic mold are fixed. Compared with the prior art, the hydraulic ejection structure of the plastic mold has the beneficial effects thatthe oil way is arranged in the mold foot of the plastic mold, and therefore an oil pipe is prevented from being damaged by pressing in the mold installing, mold detaching and transporting process; the oil pipe is arranged in the mold foot, the space is reduced, and interference with other structures of the outer side of the mold can be avoided; the service life is longer than that of the oil pipe; and after the oil hydraulic cylinder is installed, oil hydraulic cylinder detachment is not needed in the follow-up maintenance and mold detaching, and the problem of oil leakage does not exist.

The invention provides an online energy-saving system with two independent hydraulic stations. The online energy-saving system comprises a first hydraulic station and a second hydraulic station, wherein a first pipeline is arranged between an energy accumulator header pipe of the first hydraulic station and an energy accumulator header pipe of the second hydraulic station, and a valve M1 is arranged on the first pipeline; an oil return pipeline of the first hydraulic station is connected with an oil return pipeline of the second hydraulic station through a second pipeline, and a valve M2, a valve M3 and a valve M4 are arranged on the second pipeline, the first hydraulic station and the second hydraulic station separately; a third pipeline is arranged between the oil return pipeline and anoil discharge pipeline of the first hydraulic station, a fourth pipeline is arranged between the oil return pipeline and an oil discharge pipeline of the second hydraulic station, and a valve M7 and avalve M6 are arranged on the third pipeline and the fourth pipeline separately; and a valve M8 and a valve M5 are arranged on the oil discharge pipeline of the first hydraulic station and the oil discharge pipeline of the second hydraulic station separately. The online energy-saving system with the two independent hydraulic stations has the beneficial effects that one hydraulic station can be used for two production lines by only switching on or switching off the valves, the design is ingenious, the structure is simple, the oil expelling problem does not exist when power is supplied after combination, and energy saving is achieved finally; and the production efficiency can be guaranteed, and one hydraulic station can be used as a standby machine.

The invention relates to an assembly process and provides a brushless motor assembly process, which comprises the following steps: 1) assembling a rotor assembly, wherein assembly of the rotor assembly comprises assembly of an end cover assembly and assembly of a rotor with magnetic steel; 2) assembling a stator assembly, wherein in the stator installation process, heating a housing to expand the housing first, and then, placing stator assembly in the housing; 3) installing the rotor assembly in the stator assembly; and 4) assembling induction magnetic steel to a rotor shaft. The provided brushless motor assembly process can ensure stability of a brushless motor, good consistency of motor performance and small variation, and solves the technical problems that in the brushless motor assembly process in the prior art, since a rotor plays up and down, and the rotor assembly and the stator assembly are poor in concentricity, the motor performance consistency is poor, stability is poor and variation is large.

The invention discloses a double-motor recirculating ball type steering system for a heavy commercial vehicle, which comprises a steering wheel, a steering shaft, a steering angle sensor, an auxiliary motor, an electromagnetic clutch, a worm and gear reducing mechanism, a recirculating ball type steering gear, a torque sensor, a main motor, a planetary gear reducer and a control module, and is characterized in that the steering wheel is assembled at the top end of the steering shaft; the torque sensor is assembled on the steering shaft, the recirculating ball type steering gear input shaft is assembled at the bottom end of the steering shaft, the auxiliary motor is connected with the steering gear input shaft through the worm gear reducer, the steering angle sensor is installed on the steering gear input shaft, and the lower end of a steering screw of the recirculating ball type steering gear is connected with the main motor through the planetary gear reducer. The device has the advantages that a hydraulic pump and an oil tank are omitted, and no complex oil way or oil way accessories need to be assembled; due to the dual-motor design, the fault tolerance of the steering system is improved, and the large-torque output requirement of a heavy commercial vehicle is met; and intelligent driving functions such as electric steering and lane keeping can be realized.

The invention provides a water turbine blade internal energy drive adjusting structure which comprises a pressure energy storing system, an operating system and an execution system, wherein the pressure energy storing system comprises an oil tank, an energy storing device, an oil pump and a pressure automatic control unit, the operating system comprises a digital valve and a displacement sensor, and the execution system comprises an operation connecting arm and a blade servomotor. The pressure energy storing system, the operating system and the execution system are installed in a blade hub. The energy storing device, the oil pump and the digital valve are distributed horizontally in a concentric mode and are connected to the blade servomotor through oil conveying pipelines. An access control system is introduced by electric signals of a blade through an inner cavity cable sliding ring of a main shaft so as to conduct control. The problems that sealing is not good and oil is leaked in the process of conveying external hydraulic energy to a rotating energy receiving part, and oil pressure is limited in rotary sealing conveying operations are solved due to the fact that the pressure energy storing system, the operating system and the execution system are installed in the blade hub and used for adjusting the blade.

The invention discloses a pod rain-line type damper suitable for a stay cable. The damper is wound on a stay cable tightly and closely and comprises a protective sleeve, a metal woven layer, cabin partition boards and particles enclosed in cabins. A rope-type cavity is formed by the metal woven layer. The cabin partition boards divide the cavity into a plurality of small cabins, and particles with different particle diameters are evenly distributed in each small cabin. The protective sleeve is coated outside the entire rope-type cavity. The pod rain-line type damper suitable for the stay cable has the advantages that vibration energy of the stay cable can be consumed through the forms such as motions of the particles in the pod rain-line type damper, collisions and frictions between the particles and collisions and frictions between the particles and cabin walls, so that the aim of vibration attenuation of the stay cable is achieved. Due to the fact that the pod rain-line type damper is wound on the stay cable tightly and closely, the aim of damaging of rain lines on the stay cable is achieved. Wind and rain vibrations of the stay cable can be reduced effectively. At the same time, internal damping of the stay cable is increased, so that vibrations in other forms are reduced.

The invention discloses uniform oiling equipment for automatic oiling of a lead screw. The equipment comprises an oil drum and an air pump connected with the oil drum, and further comprises a PLC control system, a feeding mechanism used for feeding a lead screw provided with a turbine, a transmission mechanism used for driving the lead screw to rotate, an oiling mechanism used for evenly oiling the lead screw, and a collecting mechanism used for cleaning residual waste oil after oiling of the lead screw, the oiling mechanism is provided with a sliding rail, a sliding block, an oil gun arrangedon the sliding block, a first linkage device used for achieving overall movement of the sliding block and a switch used for controlling opening or closing of the oil gun. The equipment realizes automatic oiling and uniform oiling of the screw rod.

The utility model relates to a control device for repeatedly in place hydraulic equipment, which is composed of a two-position two-way oil return rotary valve, a double control one-way valve and a hydraulic control one-way valve. The lower chamber of the oil cylinder of the device is provided with a low-pressure accumulator, and the upper chamber of the oil cylinder is provided with a high-pressure accumulator. The operating handle is placed in a handle pipe seat, which is provided with a universal coupling capable of controlling the oil return rotary valve, and a power arm for driving the oil pump is fixed on the handle pipe seat. Because the present invention has high and low-pressure accumulators, when the high-pressure accumulator releases energy to the upper chamber of the oil cylinder and the pressure drop piston is in place, the oil in the lower chamber enters the low-pressure accumulator to store energy and is used to lift the piston again. It realizes full hydraulic automatic position, and there is no oil leakage problem at the breathing port of the fuel tank. The control device composed of oil return rotary valve and two one-way valves has reliable sealing on time. The pump and valve are jointly controlled, and the operating handle can make the oil pump arbitrarily supply oil to the upper and lower chambers of the oil cylinder, realizing repeated positioning without load.

A normal-temperature self-gas-sealing device for a bearing comprises a static seal part, a movable seal part and the bearing. The static seal part comprises a bearing pedestal bottom cover and a bearing pedestal upper cover. The bearing pedestal bottom cover is composed of a bottom plate inner lip part, a bottom plate outer lip part and a bottom plate. The bearing pedestal upper cover is composed of an upper cover inner lip part, an upper cover outer lip part and a connection plate. The upper cover outer lip part and the bottom plate outer lip part are connected in an extending manner. A lubrication chamber used for storing lubricating oil is formed between the bearing pedestal bottom cover and the bearing pedestal upper cover. The movable seal part comprises a shaft lip part A and a shaft lip part B which are arranged on a stirring shaft in a sleeving manner. The shaft lip part A is located between the bottom plate inner lip part and the bottom plate outer lip part in the radial direction. The shaft lip part A, the bottom plate outer lip part and the upper cover outer lip part are buckled in a staggered manner in the axial direction. The shaft lip part B and the upper cover inner lip part are buckled in a staggered manner in the axial direction. The upper cover inner lip part is located in the shaft lip part B. The bearing is located between the bottom plate inner lip part and the shaft lip part A in the radial direction. The normal-temperature self-gas-sealing device can be suitable for high-sped or low-speed stirring reactions and can be suitable for both inert gas shielding reactions and reaction systems with toxic and harmful gas.