166results about How to "Realize commutation" patented technology

The invention provides a door lock handle reversing device. The device is characterized in that a limiting structure and a torsional spring positioning block are rotated, a torsional spring, a connecting block, a reversing strip, a door handle and other parts are innovatively arranged and interconnected, and the door lock handle can be reversed and positioned through the reversing strip, namely, the door handle can be freely rotated in 360 degrees when the reversing strip is not inserted, and thus the function of reversing the door handle is easily achieved; when the reversing strip is inserted, the door handle is positioned under the effect of an angle limiting block and a bulge b, and meanwhile, the handle is downwards pressed and upwards lifted. With the adoption of the integral structure design, the device has the advantages of being convenient to mount and reverse, small in space used, and easy and safe to be operated.

Disclosed are a propelling method and a device for vessels and other navigating machinery in water. The method based on the hydraulic transmission principle includes transforming mechanical energy output by a plurality of main engines (more than two) into pressure energy of hydraulic oil, after power integration and distribution, respectively driving a propeller screw, a steering engine (which can be canceled after employing a pod revolving device), a lateral-thrust unit and other auxiliary devices, using a shaft generator to replace a ship auxiliary engine, adjusting revolution rate and steering of the propeller screw by controlling a pump and the main engines, realizing coordinated working of other auxiliary devices of the propeller screw, the steering engine, the lateral-thrust unit and the like and various working modes of the main propelling system, simultaneously recycling inertia energy produced by the propeller screw and vessel in the brake process and the like. The propelling method has the advantages of flexible engine room arrangement, large power-to-weight ratio of devices, high safety and reliability, high maneuverability, good work condition engaging characteristic, strong overload protection capacity, inertia energy recycle and the like.

The invention provides a plate-type concentrated material distributing valve device, comprising a single tube plate provided with a header pipeline, a double tube plate provided with two branch pipelines and a valve body arranged between the single pipeline and the double pipelines, a sealing device between the single pipeline and the valve body and a sealing device between the double pipelines and the valve body; wherein a first end of the header pipeline is communicated with a delivery manifold, the first end of each branch pipeline is communicated with a branch pipe, the valve is suitable for switching between a first working position and a second working position and provided with two valve body pipelines which are not mutually communicated with each other, at the first working position, the first end of one of the valve body pipelines is communicated with a second end of the header pipeline and the second end of the header pipeline is communicated with the second end of one of the two branch pipelines; at the second working position, the first end of the other valve body pipeline is communicated with the second end of the header pipeline and the second end of the header pipeline is communicated with the second end of the other branch pipeline. The distributing valve device of the invention features simple structure, easy reversing, reliable sealing and simple and convenient maintenance.

The invention relates to a flexible parallel drive device for ship propeller swing and rotation. The flexible parallel drive device comprises a propeller, a parallel propeller swinging mechanism, a rotary driver and a flexible shaft coupling, wherein the parallel propeller swinging mechanism comprises a machine base, a moving table, a middle SP-type constraint branch, two SPS-type drive branches and an SPR-type drive branch and realizes swinging and axial movement of the propeller along with the middle constraint branch around a ball pair at the center of the machine base; the rotary driver comprises an engine and a main shaft; the flexible shaft coupling comprises two flange plates and a group of rope traction components; the two flange plates are respectively and fixedly connected with the main shaft and one end of the middle constraint branch; the rope traction components are circumferentially, uniformly and flexibly connected with the two flange plates; the rotary driver drives the middle constraint branch to drive the propeller to rotate through the flexible shaft coupling. The flexible parallel drive device provided by the invention has the benefits that the structure is simple and compact, the propeller is flexible to rotate and swing, the rotary driver is good in stability, small in vibration and easy to control, and a swinging rudder drive mechanism and a swinging rudder control system are not required.

The invention belongs to the technical field of hydraulic unloading of a coal mine underground explosion-proof vehicle, particularly relates to a novel energy accumulator automatic unloading device of the coal mine underground explosion-proof vehicle, and aims at solving the problem that safety production accidents are easily caused by an under-pressure energy accumulator of an existing coal mine underground explosion-proof vehicle. The novel energy accumulator automatic unloading device comprises an oil tank, a working pump, a liquid filling valve, a hydraulically controlled reversing valve and an energy accumulator which are connected in sequence, wherein the hydraulically controlled reversing valve is further communicated with engine oil and the oil tank; an outlet of the energy accumulator is connected with a pressure gauge on a cab instrument panel. With the adoption of the novel energy accumulator automatic unloading device, the accidents caused by the fact that the energy accumulator is under pressure when a worker repairs the vehicle can be effectively prevented; high-pressure oil in the energy accumulator is automatically unloaded back into the oil tank (with the zero pressure) as long as the vehicle is parked and shuts down, so that the personal safety of the repairing worker is ensured; guarantees are provided for safe repairing of the current coal mine underground vehicle, and automatic unloading of the energy accumulator on the explosion-proof vehicle can be realized.

The invention discloses a deep blind hole inner diameter automatic measuring device and measuring method. The deep blind hole inner diameter automatic measuring device comprises a front measuring module, a middle stop module and a rear driving module. The front measuring module is connected with the rear driving module through the middle stop module. Firstly the front measuring module, the middlestop module and the rear driving module are placed in the deep blind hole to be measured from the inside to the outside in turn during measurement; secondly, the rear driving module pushes the front measuring module and the middle stop module to move in the deep blind hole, and the front measuring module completes the measurement of the inner diameter of the deep blind hole; and finally the middlestop module automatically stops the measuring device at the bottom end of the deep blind hole, and the rear driving module drives the front measuring module and the middle stop module to reversely move to the orifice. The non-contact front measuring module, the adaptive rear driving module and the automatic middle stop module, are used so that automatic detection and commutation of the inner diameter of the deep blind hole within a certain range can be realized and the measurement accuracy and efficiency of the inner diameter of the deep blind hole can be enhanced.

The invention discloses a heat management system of a vehicle, and the vehicle. The heat management system comprises a compressor, a first indoor heat exchanger, a second indoor heat exchanger, an outdoor heat exchanger, a reversing valve, a heat source device and a battery pack. The battery pack comprises a refrigerant cooling branch and a liquid cooling branch, and a refrigerant is suitable forflowing in at least one of the compressor, the first indoor heat exchanger, the second indoor heat exchanger, the outdoor heat exchanger and the reversing valve to form a refrigerant circulating flowpath. A liquid cooling loop is suitable for exchanging heat with the heat source device. The refrigerant cooling branch selectively communicates with a refrigerating loop and a heating loop and is selectively connected between the first indoor heat exchanger and the outdoor heat exchanger in series; and the liquid cooling branch is selectively communicated with the liquid cooling loop. According to the heat management system, temperature adjustment of the interior of the vehicle and the heat source device of the vehicle can be achieved, and temperature adjustment of the battery pack can also be achieved.

The present invention provides a right and left hand interchange mechanism for a rope-driven upper limb rehabilitation trainer. The right and left hand interchange mechanism includes a wrist reversingportion, a forearm compensating portion and an elbow flexing and extending portion, wherein the wrist reversing portion includes a supporting plate for supporting a wrist, a narrow connecting plate fixed to the bottom of the supporting plate, a Z-shaped connecting plate with one end fixed to the narrow connecting plate and adjacent to the supporting plate, and a Hall operating rod disposed on oneside of the Z-shaped connecting plate; the forearm compensating portion includes a short connecting plate connected to the other end of the Z-shaped connecting plate, a sliding block connected with the short connecting plate through a screw and a linear guideway guide groove where the sliding block is embedded and which is used for the movement of the sliding block; and the elbow flexing and extending portion includes a forearm connecting rod connected with the linear guideway guide groove, an elbow pull cable wheel connected with the forearm connecting rod through a pin, an elbow limiting fixed block fixed at the bottom of the forearm connecting rod through a pin, two reversing positioning pins disposed on the elbow limiting fixed block, a C-shaped joint connector for placing the elbow pull cable wheel and the end of the forearm connecting rod at the position of an opening, and a flexing and extending rotating shaft passing through through holes in a top plate and a base plate of theC-shaped joint connector, the elbow pull cable wheel and the end of the forearm connecting rod.

The invention discloses a series direct-current motor four-switch topological device and a control method thereof, and relates to the technical field of brushed direct-current motors. The series direct-current motor four-switch topological device comprises a full-bridge circuit, a center signal processing unit, a gate drive circuit and a flyback diode, wherein the full-bridge circuit comprises semiconductor switch elements. The full-bridge circuit which is composed of the semiconductor switch elements is utilized to control one of windings of the series direct-current motor, then the other winding is in series connection between the full-bridge circuit and bus directly, and the flyback diode is in parallel connection with the winding reversely. Since one of two power supply switches of the full-bridge circuit can be selected to control current direction of the windings connected to the full-bridge circuit, reversing of electromagnetic torque of the motor is realized.

The invention discloses a reversing device of paper money transport channel. The device comprises a reverser and a pull force machine which is used for driving the reverser to rotate positively and negatively for a predetermined angle, the pull force machine is connected with the reverser through a gear mechanism, the gear mechanism comprises a first gear and a second gear, the second gear is connected with a reverser shaft of the reverser, the first gear is in hinge joint with a driving plate of the pull fore machine and can rotate around a rotating shaft. With the reversing device of the paper money transport channel, limitation to switchable maximum angle of an electric magnet of the pull force machine is improved, large-angle reversing is realized; the tradition where the electric magnet of the pull force machine only can perform reversing one time is broken, and multi-channel different-angle reversing is realized.

The invention discloses a pneumatic and electric matched automatic loading and unloading device. The device consists of a control system, a worktable, a feeding mechanism and a loading and unloading mechanism; a motor transmits power to a conveying belt; and the taking of workpieces to be machined is realized through combined action of the motor and a feeding cylinder. The workpieces are pushed to a pneumatic slide table through a workpiece pushing cylinder; and the pneumatic slide table and a swing cylinder are matched to realize conveying and reversing of the workpieces. A finger-shaped air jaw realizes loading and unloading movement under effects of a transverse moving cylinder and a longitudinal telescopic cylinder. The finger-shaped air jaw and a needle-shaped cylinder are matched to realize clamping, placement and positioning of the workpieces; and the longitudinal telescopic cylinder and the transverse moving cylinder are matched to realize transverse and longitudinal movement of the loading and unloading mechanism. The control system adopts a PLC and an industrial controller to control the feeding mechanism and the loading and unloading mechanism, and realizes independent work of different mechanisms according to demands; and the pneumatic and electric matched automatic loading and unloading device realizes quick loading and unloading of a machine tool, and improves the production efficiency.

The invention provides a valve special for a photovoltaic power station solar panel cleaning system. The valve comprises a valve body, the valve body is provided with a transverse supporting arm, water outlet pipes with downward outlets are arranged at the two ends of the transverse supporting arm respectively, the water outlet pipes and the transverse supporting arm are integrally connected in a 90-degree mode, the middle of the transverse supporting arm is connected with a water inlet pipe, a reversing sphere is arranged in an inner cavity in the middle of the valve body, a protruding block is arranged on the reversing sphere, a reversing hole is formed in the reversing ball, the protruding block is arranged in a groove of a connecting cover, the connecting cover is connected with a reversing handle, and a rolling wheel is arranged on the reversing handle. The valve is used by being mounted in the photovoltaic power station solar panel cleaning system, and is long in service life, and therefore the maintenance quantity of the cleaning system is reduced.

The invention belongs to the technical field of medical treatment, and particularly discloses a power quick-mounting device, a power device and a surgical robot. The power quick-mounting device comprises a quick-mounting unit, wherein the quick-mounting unit comprises a mounting main shaft, a plugging sleeve and a ball, the mounting main shaft is provided with a containing cavity and a placing hole, the plugging sleeve can slide between a first position and a second position relative to the mounting main shaft, the ball is partially contained in the placing hole, and a ball groove is formed in the inner wall of the plugging sleeve; a base unit which is provided with an inserting cylinder part, wherein an accommodating groove is formed in the outer wall of the inserting cylinder part; when the plugging sleeve slides to the first position, the ball can retreat from a containing cavity and partially enter the ball grooves, and when the plugging sleeve slides to the second position from the first position, the groove walls of the ball groove can abut against the ball and enable the ball to partially extend into the accommodating grooves. According to the power quick-mounting device, the power device and the surgical robot, the convenience of cleaning and replacing the power unit can be improved.

The invention discloses a magnetic control wheel based on an electromagnetic propulsion system, which comprises a magnetic control wheel body, a stator iron core, a spindle, a bearing piece, a rotor iron core and a wear-resisting tire, wherein the middle part of the magnetic control wheel body is provided with the spindle; the outer end of the spindle is connected with a spindle cap; the inner end of the spindle is welded with a fixing shaft; the stator iron core is welded on the spindle; the outer side surface of the stator iron core is provided with a plurality of protruding claw poles; a stator winding is wound on the claw pole; the stator iron core is sleeved with the rotor iron core; the inner wall of the rotor iron core is provided with a plurality of rotor tooth poles; and an excitation winding is wound on the rotor tooth pole. The assembling is convenient, the shock absorption performance of the magnetic control wheel body is improved, the movement of the magnetic control wheel body is realized, the consumed energy is provided through conversion by electric energy, the speed of the existing vehicle is improved, the bearing piece increases rotation stability of the rotor iron core, a plurality of tire surface inner supporting pieces, a magnetic insulation ring and the wear-resisting tire, the magnetic control wheel body can be driven to rotate reversely conveniently, and steering of the magnetic control wheel body is realized.

The invention discloses a hydraulic system of a vibrating pile driver. The hydraulic system comprises a first oil cylinder, a first electromagnetic valve, a first vibration control valve, a second oil cylinder, a second electromagnetic valve, a second vibration control valve and a driving mechanism. The first vibration control valve is connected with the first oil cylinder, and the second vibration control valve is connected with the second oil cylinder; one end of the first electromagnetic valve and one end of the second electromagnetic valve are connected with the first oil cylinder, and the other end of the first electromagnetic valve and the other end of the second electromagnetic valve are connected with the second oil cylinder; and the first vibration control valve and the second vibration control valve are both connected with the driving mechanism. The electromagnetic valves and the vibration control valves are utilized for controlling the working sequence of the first oil cylinder and the second oil cylinder, and therefore the two oil cylinders constantly and alternatively vibrate for pile driving; on the basis of the pile driving principle, the impact fore is large, too large pile driving mass is not needed, the reactive force is small, and the reliability is high; and in addition, the full-hydraulic system is adopted to carry out driving and control, and the hydraulic system is simple in structure, large in driving force, convenient to control and use, and also low in manufacturing cost.

The invention discloses a defrosting system of an air-source heat pump. The defrosting system comprises an outdoor unit, an indoor unit, a phase-change energy accumulator, a compressor, a four-way valve and a throttling element, wherein a port A of the four-way valve is communicated with the indoor unit through a pipeline provided with a first electromagnetic valve, and is communicated with the phase-change energy accumulator through a pipeline provided with a second electromagnetic valve; a port B of the four-way valve is communicated with an air suction opening of the compressor through a pipeline; a port C of the four-way valve is communicated with the outdoor unit through a pipeline; a port D of the four-way valve is communicated with an air exhaust opening of the compressor through apipeline; the indoor unit and the phase-change energy accumulator are communicated with the throttling element respectively through pipelines which are provided with a check valve and a third electromagnetic valve; the throttling element is communicated with the outdoor unit through a pipeline; an inlet of the check valve is communicated with the indoor unit; an outlet of the check valve is communicated with the throttling element. The defrosting system of the air-source heat pump has a simple structure, and residual heat of a heating cycle can be effectively utilized to carry out defrosting.

A hydraulic transmission method and device using boat diesel engine afterheat relates to the technical field of hydraulic transmission, in particular suitable for the utilization of waste gas afterheat for producing the boat diesel engine. Based on the principle of the hydraulic transmission, the waste gas afterheat of the boat diesel engine is used and is extracted from the bypass valve; the turbine is pushed to rotate; the hydraulic pump converts the turbine mechanical energy into the pressure energy of the hydraulic oil which respectively assists the driving dynamo and steering engine by a power distribution loop. The device includes a hydraulic system driving loop, a system oil compensating loop and a system pressure overload safety protection loop in order to fit various running working conditions of boat. The method and device can effectively use the waste gas afterheat of diesel engine in the navigation of the boat and can improve the working efficiency so as to reach the purpose of saving energy.

The invention discloses a driving device of a cableless elevator. An elevator system comprises a driving device, a lift car and a running track; the lift car moves upwards or downwards on the runningtrack through the driving device; the elevator system has no traction structure; the driving device is provided with a force application unit and a sub-driving system; the sub-driving system is connected with the force application unit; and the sub-driving system is pressed on the running track through the force application unit. The invention further discloses a multi-lift-car elevator system which comprises the driving device, at least one switching device and at least two running tracks; the switching device is provided with a switching track; the lift car is switched to different running tracks through the switching track; when the lift car is switched to different running tracks, the switching track is connected with the running tracks; and when the lift car runs on a non-switching running track, the switching track is not connected with the running track. According to the driving device of the cableless elevator and the multi-lift-car elevator system, the problem that one lift car can only run on one track is solved, the simultaneous load running of multiple lift cars is achieved, and the running efficiency of the elevator is greatly improved.

The invention relates to a waste cotton cleaning system based on a non-impact reversing mechanism. The waste cotton cleaning system comprises a frame, a cleaning device, the non-impact reversing mechanism, and driving mechanisms. The cleaning device is mounted on the frame of a textile unit through a guide rail and is driven by a cleaning driving mechanism to perform suction-blow cleaning; the cleaning device can be driven by a displacement driving mechanism to directly move along the extension direction of the guide rail; the cleaning device can be reversed to and fro through fitting of the displacement driving mechanism and the non-impact mechanism. The waste cotton cleaning system has the advantages that no impact occurs during reversing, the independent motor for driving a fan needs only 0.55Kw, the independent motor for driving the cleaning device in to-and-fro movement needs only 0.12Kw, and the need for motor power is greatly lowered.

The invention discloses an oil distributing system of a gearbox and an oil distributing disc assembly. The oil distributing system of the gearbox comprises the gearbox and the oil distributing disc assembly. The oil distributing disc assembly comprises an oil distributing disc and a disc shaft. The oil distributing disc comprises a sleeve and a disc body. The disc shaft is mounted on the oil distributing disc in a press fitting mode. The oil distributing disc is mounted on a shell of the gearbox, and the sleeve is inserted into a control cavity of a clutch in the gearbox. A first oil way is formed in the disc body, a first oil hole is formed in the sleeve, a first oil groove is formed in a press fitting surface of the disc shaft, and both the first oil way and the first oil hole communicate with the first oil groove. The first oil way is provided with a first oil port used for oil feeding. According to the oil distributing system of the gearbox, the oil distributing disc assembly of the oil distributing system ingeniously utilizes interference fit between the oil distributing disc and the disc shaft, the first oil groove of the disc shaft is converted into an oil way, the structureof the oil distributing disc assembly is simplified greatly, and furthermore, machining of the oil distributing disc assembly can be made easier.

The invention discloses a child automobile safety seat with a forward use state and a reverse use state, which comprises a base and a seat body, and the seat body is rotatably arranged on the base. The child automobile safety seat further comprises a locking mechanism and an unlocking mechanism, the locking mechanism is arranged between the base and the seat body, the locking mechanism is provided with two locking positions on the base, and the two locking positions are arranged in the circumferential direction of the base at intervals. The unlocking mechanism at least comprises two sets of operating pieces, the two sets of operating pieces are arranged on the two different sides in the width direction of the seat body respectively, and the locking mechanism can be independently unlocked at the two locking positions by operating any set of operating piece. According to the child automobile safety seat, two locking positions are arranged, so that the seat is more stable and not prone to shaking, and the safety performance is improved; by arranging the two unlocking operation pieces, a parent on one side can achieve unlocking and reversing of the seat body without bending down or turning around, and operation is quite easy and convenient.

A track reversing device of a cable drum carriage comprises a base plate, a rotary plate, two track boards and a motor. A rotary shaft component is disposed in the middle of the base plate. The upper surface of the base plate is located at the periphery of the rotary shaft component and provided with a support part. The rotary plate is located above the base plate and parallel with the same. The middle of the rotary plate is pivoted to the rotary shaft component. The lower surface of the periphery of the rotary plate is movably matched with the top end of the support part. Two grooves respectively located on two sides of the rotary plate are formed on the upper surface of the rotary plate. The two track boards are respectively embedded into the two grooves. The outer side of each track board is fitted to the outer side wall of the corresponding groove. A limit groove is formed between the inner side of each track board and the inner side wall of the corresponding groove. The body part of the motor is fixed on the base. The rotary plate is synchronously connected with the rotary shaft of the motor. The track reversing device has the advantages that track directions of the cable drum carriage can be changed by turning on the motor, reversing of the cable drum carriage is achieved, and the track reversing device is simple to operate, small in space occupation, free of hoisting, and high in safety.

The invention discloses a screen switchover device based on big data. The screen switchover device comprises a table top, a first host and a second host, wherein a hollow area is arranged in the tabletop, an annular track bar is arranged on the hollow area, a driving gear is arranged on the track bar, a rotation motor is connected to the driving gear, a driven gear is meshed on the driving gear,a linkage rod is arranged on the driving gear, a mounting rod is hinged to one end of the linkage rod, the middle part of the mounting rod is hinged to the linkage rod, rollers are arranged at two ends of the mounting rod, the rollers are connected to the track bar in a rolling manner, a notch allowing the rollers to enter is arranged in the track bar, a sunken groove is arranged in the notch, when passing through the notch, the rollers sink into the sunken groove, a stirring block is arranged on the driven gear, the stirring block stirs the rollers into the sunken groove when the rollers moveto the notch, a base is arranged on the mounting rod, and a display is arranged on the base. With the technical scheme, the switchover of the screen can be realized.

The auxiliary welding tool comprises a bottom plate, a winding drum jacking clamp and a flange clamp, a fixing base is arranged at one end of the bottom plate, and a sliding base installed in a first guide groove in a sliding mode is arranged at the other end of the bottom plate; one side of the fixed seat and one side of the sliding seat are rotationally connected with supporting arms, the winding drum jacking clamp is arranged in the winding drum, and the winding drum jacking clamp is of a retractable structure; the flange clamp comprises a chuck body, a bevel gear wheel is arranged in the chuck body, a spiral groove is formed in one side of the bevel gear wheel, a plurality of clamping jaws are spirally connected to one side of the spiral groove, steps are arranged at the tail ends of the clamping jaws, and the clamping jaws are slidably connected with the chuck body. And one side of the bevel gear wheel is meshed with a plurality of bevel pinions. According to the winding drum jacking clamp, the inner wall of the winding drum is jacked, damage to a winding drum rope groove when the winding drum is supported is avoided, meanwhile, axial jumping generated when the winding drum is rotated in the welding process is avoided, the winding drum supporting stability is guaranteed, and then the welding quality of a flange and the winding drum is guaranteed.

The invention provides a novel minimally invasive surgical tool for a minimally invasive surgical robot system. The novel minimally invasive surgical tool comprises a handle, a joint I, a rod I, a joint II, a rod II, a joint III, a rod III, a joint IV, a rod IV, a joint V, a rod V, a joint VI, a rod VI, a joint VII, a rod VII, a joint VIIII, a rod VIII, a joint IX, a rod IX, a joint X and an actuator, all of which are sequentially connected from top to bottom. The joint I and the joint X are linked, and the same-direction pitching action and the synchronous opening and closing action of the handle and the actuator are achieved; the joint II and the joint IX are linked, and same-direction transverse rolling motion of the handle and the actuator is achieved; the joint III and the joint VIII are linked, and same-direction deflection motion of the handle and the actuator is achieved; the joint IV and the joint VII are linked, and mirroring X-direction motion of the handle and the actuator is achieved; the joint V and the joint VI are linked, and mirroring Y-direction motion of the handle and the actuator is achieved. The novel minimally invasive surgical tool is high in flexibility and operating capacity, multiple kinds of operation of minimally invasive surgery are achieved, the surgical operating capacity of a minimally invasive surgical robot is improved, and the surgical effect is improved.

The invention provides a two-position three-way reversing valve and a reversing method used for a small-flow liquid nitrogen low-temperature system. The reserving valve is a single electrical-controllever corrugated tube valve driven by an electromagnet, and comprises a valve body structure, a corrugated tube sealing structure, a lever hinge reinforcing structure and an electromagnet power generation structure, wherein the valve body structure comprises a valve seat, a double-conical-surface movable valve rod, an upper conical surface sealing base, a lower conical surface sealing base and a movable valve element connecting rod; the corrugated tube sealing structure comprises a corrugated tube and an elastic connector; and the lever hinge reinforcing structure comprises a first conductingpiston, a reinforcing connecting rod and a second conducting piston. The two-position three-way reversing valve has the advantages that the two-position three-way reversing valve is suitable for beingused under an ultra-low temperature environment, and is especially suitable for being used under a small-flow low-temperature environment. The cut-off valve principle is utilized for switching to thedouble-conical-surface movable valve rod for sealing and opening the upper conical surface sealing base and the lower conical surface sealing base so as to realize reversing of ultra-low-temperaturefluid. The two-position three-way reversing valve for the small-flow liquid nitrogen low-temperature system has the characteristics of a small size, a little cold loss, small leakage amount and quickresponse.

The invention discloses a toothed rail vehicle and a horizontal-type driving device thereof. The horizontal-type driving device of the toothed rail vehicle comprises a toothed rail, a set of driving device and two sets of power transmission devices. Teeth are arranged on the two side walls of the toothed rail. Each set of power transmission devices drives a transversely-arranged transmission gear to rotate. The two sets of power transmission devices are driven by the set of driving device to move, and the two transmission gears corresponds to the teeth on the two side walls of the toothed rail to conduct engaged transmission, so that driving of the toothed rail vehicle is achieved. The deficiency that a present toothed rail vehicle cannot be applied to a large gradient is solved, and the requirement of large gradient transportation is met.