45results about How to "Suction tight" patented technology

The invention relates to a float type level gauge for on-site indication, which comprises a float, a graduated scale and a noctilucence wheel, and is characterized by further comprising a conducting or magnetic conducting guide rail, wherein the noctilucence wheel comprises an insulating box, a light source, two longitudinally arranged magnetic shafts or metal shafts, and two conducting wires for supplying power to the light source; for a magnetic float type level gauge, the noctilucence wheel also comprises a steel magnet; under the magnetic action, the magnetic shafts or the metal shafts, along with upward and downward movements of the float, move upwards and downwards along the guide rail so as to indicate the liquid level on-site accurately in time; or a resistance wire is enwound on the guide rail, and the resistance value of a conducting loop comprising the guide rail, the magnetic shafts or the metal shafts, the conducting wire, the light source and the like is measured to acquire a corresponding liquid level value so as to achieve the continuous long-distance transmission of liquid level data. The float type level gauge can also comprise a pulley wheel, a counterbalance, a connecting rope or a connecting belt to balance the noctilucence wheel. The float type level gauge has the significant characteristics of simple structure, clear and obvious on-site indication, flexible and accurate measurement and continuous long-distance signals.

The invention relates to a float type level gauge for high-temperature high-pressure or high-temperature low-density medium, comprising a float chamber, a float and a graduated scale; the float type level gauge is characterized in that: the float is a hollow spherical shape; the float type level gauge further comprises a guide rail and a magnetic connector, a magnetic steel or a disc-shaped magnetic steel is arranged in the magnetic connector and forms magnetic attraction with a magnetic ball body in the float made of the nonferrous magnetic material or the disc-shaped magnetic steel the float made of the nonferrous magnetic material, a metal shaft laterally spanned at two side walls of the magnetic connector is exposed to two side walls and is attached to the guide rail by magnetic force, and the metal shaft can move up and down along the guide rail under the driving of the magnetic force; in addition, resistance wires are wound on the guide rail to measure the change of the resistance value of a return circuit, so as to realize continuous remote transmission of a signal. The float type level gauge for high-temperature high-pressure or high-temperature low-density medium solves the difficult problem of liquid level measurement in the high-temperature high-pressure or high-temperature low-density medium and has high measuring precision; in addition, the structure is simple, the usage is convenient, the manufacturing and maintaining cost is low and the application is wide.

The invention discloses an electromagnetic valve, comprising a valve base (2), a sleeve (5) connected with the valve base (2), and a coil (10) outside the sleeve (5). The valve base (2) is provided with a valve opening (9) and is fixed with a medium inlet pipe (1) and a medium outlet pipe (3); a static iron core (8) and a movable iron core (6') are arranged in the sleeve (5), a spring is arranged between one end of the movable iron core (6') and the static iron core (8), a containing part (62') and an end part (63') are arranged at the other end of the movable iron core (6'), the containing part (62') contains a sealing element (4) that opens or closes the valve opening (9), and a gap is arranged between the end part (63') and the sealing element (4). In the invention, the reliable operation of the electromagnetic valve is guaranteed without increasing the diameter of the iron core or the cost.

This invention publicized belonged to the diesel engine fuel injection installment one kind of electric control in line combination to pump / the valve - tube - mouth to spray the diesel oil injection system. Should the injection system mainly include the electronic control unit, in line the combination pumps / the valve mechanism, the high-pressure oil pipe, the spray hole and the low pressure fuel oil system. The characteristic is in line the combination pumps / the valve mechanism plunger partner to use the direct jack-in type structure, in pump body in-line type arrangement; The plunger partner's plunger crown does not have the skewed slot, only undertakes for the oil and pressurizes the function; Integrates on in in the plunger partner plunger cavity high-pressured oil duct has the high speed solenoid valve module, solenoid valve coil and the electronic control unit is connected, by electronic control unit through solenoid valve direct control fuel injection process; This system not only causes the oil pump structure to simplify, the intensity increases, greatly enhanced has supplied the oil pressure, moreover caused for the oil process and the adjustment process decoupling, has realized through the high speed solenoid valve module to fuel injection the process direct digital control; The blow rule for a more ideal wedge, has the low initial blow rate, high host spraying rate, the fast high-pressured unloading and the remaining fluctuation of pressure are small and so on the merit: Also system layout simple, transforms few to the engine main body, the transplant is convenient.

The invention relates to a magnetic lifting handle, in particular to a magnetic lifting handle for assembling ferromagnetic precision workpieces. The magnetic lifting handle comprises two magnetic actuating mechanisms and rotating adjustment mechanisms connected between the two magnetic actuating mechanisms, each magnetic actuating mechanism comprises a magnetic seat, a middle connecting plate, a force bearing arm, an elastic positioning mechanism and a handle, the upper end faces of the magnetic seat are fixedly connected with the force bearing arms through the middle connecting plates, through holes are formed in the middle connecting plates, the elastic positioning mechanisms connected with the upper end faces of the magnetic seats are arranged in the through holes, one end of each force bearing arm is connected with one side of the corresponding handle, a connecting arm for connecting the corresponding rotating adjustment mechanism is arranged on the other side of the handle, each rotating adjustment mechanism comprises a ratchet, a pawl, a rotating shaft and a spring, the ratchets are fixed on the connecting arm of one magnetic actuating mechanism, rotating ends of the pawls are connected with the connecting arm of the other magnetic actuating mechanism through the rotating shafts, and large ends of the pawls are connected with the handle of the other magnetic actuating mechanism through the springs. The magnetic lifting handle is simple in structure, convenient to use, stable and reliable, and the precision ferromagnetic workpieces can be assembled without being scratched and stained.

Provided is a device for spraying and sucking hot water on an injured animal surface model in a self-control mode. A hot water generation source is arranged in a box, and an electric heating pipe, a heat source temperature sensor and a water level sensor are arranged in the hot water generation source. A hole is formed in the hot water generation source, an electromagnetic valve is arranged on the hole, the lower end of the electromagnetic valve is provided with a hot water spraying hose, the hot water spraying hose is connected with an injury cup, silicon rubber is arranged on the rim of an injury cup, an injury supporting plate used for fixing the animal surface is arranged on the lower portion of the rim of the injury cup, a suction pipeline is arranged in the silicon rubber and is connected with a suction collection bottle, a hot water spraying nozzle is arranged in the injury cup, negative pressure suction is started in the injury cup during injuries, hot water after the injuries is quickly sucked, spraying and suction are synchronous, and water temperature effectively keeps uniform. Premise control of hot water injury time, the area and temperature is achieved. Operation is simple and convenient to achieve, injured edges are clear, repeatability is good, scald surfaces are consistent on the same condition, and reference is provided for burn and scald wound healing and medication research.

The invention relates to door equipment, in particular to a novel door with door moving and door flat-opening functions. The novel door comprises a sliding rail mechanism and a door body structure. The sliding rail mechanism comprises an upper rail and a lower rail which are installed on a wall, and the door body structure comprises a door body frame installed between the upper rail and the lowerrail and suitable for sliding along the upper rail and the lower rail and a rotary door body installed on the door body frame. The rotary door body can rotate around one side edge of the door body frame or be attached to the door body frame, that is, the rotary door body is suitable for rotating relative to one side edge of the door body frame to achieve pushing / pulling of the rotary door body,or the rotary door body is suitable for being attached to the door body frame and being driven by the door body frame to slide along the upper rail and the lower rail. The novel door with the door moving and door flat-opening functions is suitable for solving the technical problem that the double functions that the door can be moved, pushed and pulled cannot be achieved.

The invention discloses a pedestal pan magnetized water inlet valve; at least a pair of magnetized water magnets are arranged in a water channel, and each pair of the magnetized water magnets with opposite magnetism are arranged at two sides of the water channel, a magnetic field is generated in the water channel, so as to magnetize the water flowing in the channel; the inlet valve comprises a body, a central pipe, a lower sleeve pipe, a float bowl component, a lifting rod, a ceramic magnetic valve and an anti-siphon rubber mat; the ceramic magnetic valve comprises a pair of magnets, a movable ceramic piece and a static ceramic piece, and the movable ceramic piece and the static ceramic piece are closely attached together under the action of the magnets, a rotating shaft is arranged on the movable ceramic piece and is connected with the float bowl component by the lifting rod, the float bowl component drives the movable ceramic piece to rotate by the lifting rod and the rotating shaft, so as to control the opening or closing of a ceramic magnetic valve core. In the invention, water is magnetized by the magnetized water magnets, and the flushing effect of the pedestal pan is improved; in addition, the opening or closing of the inlet valve is controlled by the ceramic magnetic valve core, thereby achieving the water inflowing and water stop effect.

A suction cup holder and a method of suctioning and positioning a mobile product are disclosed. The suction cup holder includes a suction cup and a mounting portion for mounting the suction cup. The suction cup has a disk body and a deformable suction panel disposed on one side of the disk body. The suction cup is moveable relative to the mounting portion. The deformable suction panel is deformable relative to the disk body. Thus, the deformable suction panel is linked to be deformed and returned by movement of the suction cup. The structure is simple, the controllability is good, and the utility is strong.

The invention belongs to the field of building doors and windows, and particularly relates to an adjustable seal window. The adjustable seal window comprises a window frame body, a first soft slice, rubber columns, a first cavity, a second cavity, a push rod and an air sac, wherein the first soft slice is adhered to the surface of the window frame body, the edge of the first soft slice is in a wave shape, third cavities are formed in the centers of all the rubber columns, the first cavity is formed in the left side of the window frame body, a cylinder body is arranged in the first cavity, theupper side face of the cylinder body is connected with the upper side face of the first cavity through a third spring, a first rod is fixedly connected with the front side face of the lower end of thepush rod, and first springs are evenly arranged in the air sac. The adjustable seal window is used for sealing and ventilation adjustment of a bathroom, and can drive the push rod to compress the airsac by pulling the first rod downward, and then closes gaps among the rubber columns, thereby achieving sealing for the bathroom, and furthermore expands the air sac by pulling the first rod upward to drive the push rod to move up, and then enlarges the gaps among the rubber columns, thereby achieving ventilation between the bathroom and the outside.

A device for automatically inducting and tightly sucking micro-channel side boards comprises a tightly-sucking mechanism, a lifting mechanism and a pushing mechanism. The tightly-sucking mechanism is fixed on a supporting base and comprises a press board, a square pipe and a sucker, the square pipe is fixed on the press board, and the sucker is fixed inside the square pipe; the lifting mechanism comprises a supporting frame, a first motor and a first transmission rod which is connected with the first motor, the first motor is fixed on the supporting frame, and the other end of the first transmission rod is fixedly connected with the supporting base; the pushing mechanism comprises a locating block, a second transmission rod and a transmission device which is connected with one end of the second transmission rod, the locating block is fixedly arranged on a base, and the second transmission rod clamps and penetrates through the locating block. Due to the arrangement of the sucker on the tightly-sucking mechanism, the lifting mechanism and the pushing mechanism are controlled to operate and convey the side boards to an appointed portion to be machined and assembled through the fact whether the sucker sucks the side boards or not, and the situation that machining and assembling are conducted under the situation that no side board exists can be avoided. The device for automatically inducting and tightly sucking the micro-channel side boards is simple in structure, reasonable in design and high in degree of automation.

The invention discloses a polyurethane (PU) plastic sucking forming mould and a forming method thereof. The PU plastic sucking forming mould comprises an upper mould, a lower mould and middle moulds. The upper mould and the lower mould are opposite to each other. The two middle moulds are symmetrically arranged between the upper mould and the lower mould. The upper mould extends to a forming bulge. A sealed forming cavity body is formed by the two symmetrical middle moulds and a forming downwards concave part of the lower surface of the lower mould. The bottom surfaces of the middle moulds are provided with rubber hollow sealing rings. The middle moulds are provided with positive pressure air ducts which are matched with the rubber hollow sealing rings. The positive pressure air ducts are connected with external air-pressure equipment. The positive pressure air ducts can jack the rubber hollow sealing rings out during working. Seamless matching between the middle moulds and the lower mould is achieved. According to the PU plastic sucking forming mould, when the PU plastic sucking forming mould is used, by using the above vacuum absorbability, tight absorbing between materials and forming cavity surface is achieved, during glue-injecting machining of small pressure values, good forming machining is completed, the structure is simple, using is convenient, forming of different stereo shapes can be achieved, and wide using and promoting valves are achieved.

The invention provides a door lock mounting structure, a distribution robot and a cabinet door locking method based on an electromagnetic lock. The door lock mounting structure comprises the electromagnetic lock mounted on a cabinet body through an elastic connecting mechanism and an attracted object installed on the cabinet door of the cabinet body, and the electromagnetic lock can adaptively attract the attracted object in an actuating mode through the elastic connecting mechanism. The electromagnetic lock is used for realizing locking, after the cabinet door is clamped, the cabinet door canbe naturally separated from the electromagnetic lock through simple power failure, machining and assembling errors caused during installation of the electromagnetic lock and the attracted object areeffectively offset, the installation operation is simpler and more convenient for an installer, and the installation efficiency is improved. The matching fit between the electromagnetic lock and the attracted surface of the attracted object is better realized, and the safety anti-theft performance of the cabinet door is further improved.

The invention relates to a dustproof earphone hole which comprises a conductive cylinder and an insulated rubber ring. A sealing shaft is mounted in the axis of the conductive cylinder. The sealing shaft penetrates through a base board. A baffle board is fixed at the lower end of the sealing shaft. The baffle board is connected with the base board through an extension spring. A sealing board is fixed at the upper end of the sealing shaft. The dimension of the sealing board matches the hole diameter of a downmost-layer conductive cylinder. Except for the downmost-layer conductive cylinder, each conductive cylinder is internally provided with a sealing ring slidably. The inner diameter of each sealing ring is same with that of the adjacent conductive cylinder below. The inner ring surface of each sealing ring is provided with spacing fasteners. The top end of a topmost conductive cylinder is provided with a spacing buckle. The sealing ring, the sealing board and the sealing shaft are made of a ferromagnetic material. Insulating layers are applied on the surfaces of the sealing ring, the sealing board and the sealing shaft. The dustproof earphone hole has advantages of realizing exquisite structure, effectively separating dust, preventing entering of water drops, and greatly improving waterproof safety effect of electronic products.

The invention belongs to the technical field of laser cutting, and particularly relates to high-precision laser cutting device. The device comprises a laser emitting head main body and a focusing plate, wherein the laser emitting head main body is of a cylindrical structure; a guide support plate fixedly sleeves the bottom end of the laser emitting head main body; four guide rods are embedded at the side edges of the guide support plate; the bottom ends of the four guide rods are connected with the focusing plate; a focusing lens is fixedly embedded in an opening of the focusing plate; and thetop ends of the four guide rods are connected with an annular pressing plate. The device is provided with a distance measuring instrument for measuring the actual distance from the laser emitting head main body to a thin-plate-shaped workpiece; a focusing motor rotates according to the measured actual distance; the top end of an annular pressure plate is pressed by the outer circular surface of an eccentric wheel, and the focusing plate and the focusing lens are driven to regulate and control the focal length of a laser beam emitted by the laser emission head main body, so that the focal point of the laser beam emitted by the laser emitting head main body is always positioned on the surface of the thin-plate-shaped workpiece, and the accuracy of laser cutting is improved.

The invention relates to a float type liquid level gauge for high temperature and high pressure or high pressure and low density medium, including a float chamber, a float, and a scale. The coupling is equipped with magnetic steel or disc-shaped magnetic steel, which forms a magnetic attraction with the magnetic material sphere in the non-ferromagnetic material float or the disc-shaped magnetic steel in the non-ferromagnetic material float, and is horizontally mounted on the magnetic coupling. The metal shafts on the two side walls are exposed outside the two side walls and are closely attached to the guide rails by the magnetic force, and move up and down along the guide rails driven by the magnetic force. The continuous remote transmission of signals is also realized by winding the resistance wire on the guide rail to measure the change of the loop resistance value. The invention solves the problem of liquid level measurement in high-temperature, high-pressure or high-pressure, low-density media, and has high measurement accuracy, simple structure, convenient use, low manufacturing and maintenance costs, and wide application.

The invention provides a library bookshelf mechanism which comprises a moving trolley (1), a lifting mechanism (2), a storing and taking mechanism (3), a control system (4), a recognition system (5) and a drive system. The moving trolley (1) is composed of universal rolling wheels (11), a bottom plate (12) and a book storing box (13). The lifting mechanism (2) is composed of a lifting rod (21) anda rotating table (22). The storing and taking mechanism (3) is composed of a connecting block (31), a book placing frame (32) and a mechanical arm (33). The control system (4) is installed on the front side above the bottom plate (12). The recognition system (5) is installed at the front end of the bottom plate (12). The drive system comprises a motor and a hydraulic device. According to the library bookshelf mechanism, books are stored and taken rapidly and efficiently, many books can be stored and taken conveniently, meanwhile, the mechanism clamps the books stably, and can clamp the booksplaced intensively, and the books cannot be damaged easily.

The invention discloses a tin plating tool and relates to the technical field of tin-plated part production. The tin plating tool comprises a working table. A tin-plated part is placed on the upper surface of the working table. Two pressing mechanisms distributed symmetrically are fixedly connected to the upper surface of the working table. Each pressing mechanism comprises a supporting plate, installing blocks, a rotating plate, a concave plate, a handle, a lifting block, a clamping block, a connecting block, a stretching mechanism, a U-shaped block, a thread rod, a nut and a pressing block,wherein the two installing blocks distributed symmetrically are fixedly welded to the bottom end of the supporting plate. According to the tin plating tool, by arranging the pressing mechanisms, the handles are pulled, and thus the tin-plated part can be pressed rapidly. The working efficiency of follow-up machining operation is improved. Moreover, the stretching mechanisms are arranged, people can assemble inserting connection blocks, thus the distance between each U-shaped block and the corresponding rotating plate can be changed, then the pressing blocks can fit with tin-plated parts of different sizes, and applicability of the device is improved.

The sealing pressure maintaining system of the two-stage screw compressor comprises a compressor shell body, the compressor shell body is formed by assembling a first shell, a second shell, a first sealing cover and a second sealing cover, a pressure adjusting valve seat is arranged on a second-stage air outlet in the top of the second shell, and a pressure adjusting assembly is arranged on one side of the pressure adjusting valve seat. The compressor shell body is formed by assembling the first shell, the second shell, the first sealing cover and the second sealing cover, the assembled structure is convenient to produce and cast, meanwhile, independent assembly of all transmission parts is facilitated, the discharge pressure of gas can be preset by rotating the hand wheel and sealing and opening the gas hole through the jacking block, and the gas discharge efficiency is improved. And the pressure sensor arranged between the pressure regulating screw rod and the connecting end of the ejector rod is used for detecting the pressure of the gas on the ejector block, so that the pressure when the gas is discharged is detected, and the adjustment can be conveniently carried out according to the required gas pressure.

The invention relates to the technical field of sealing and sound insulation, and discloses an invisible magnetic attraction structure and a door. The invisible magnetic attraction structure comprises a magnetic attraction assembly installed between a door frame and a door plate, wherein the magnetic attraction assembly comprises a first magnetic part installed on the door frame and a second magnetic part installed on the door plate and attracted to the first magnetic part; a sealing strip is arranged on a door stop of the door frame; the first magnetic part is installed between the sealing strip and the door stop; the second magnetic part comprises an installation base and a magnetic block; the installation base is installed in an outer frame of the door plate and corresponds to the first magnetic part in position; and the magnetic block is installed on the side, close to the first magnetic part, of the installation base. According to the invisible magnetic attraction structure and the door, the sealing and sound insulation effects are good, the design of the invisible structure is adopted, the attractiveness is high, the invisible magnetic attraction structure and the door can adapt to installation of doors of various colors, the structure is simple, installation is convenient and fast, and the use reliability of products is improved.

The invention discloses a magnetic handle, which comprises two magnetic actuators and a rotation adjustment mechanism connected between the two magnetic actuators; the magnetic actuator includes a magnetic seat, a middle connecting plate, a bearing arm, an elastic positioning mechanism and handle; the upper end surface of the magnetic base is fixedly connected to the load-bearing arm through the intermediate connecting plate; a through hole is opened on the intermediate connecting plate, and an elastic positioning mechanism connecting the upper end surface of the magnetic force base is arranged in the through hole; one end of the bearing arm is connected to the handle On one side, the other side of the handle is provided with a connecting arm for connecting the rotating adjustment mechanism; the rotating adjusting mechanism includes a ratchet, a pawl, a rotating shaft and a spring, the ratchet is fixed on the connecting arm of a magnetic actuator, and the rotating end of the ratchet The connection arm of another magnetic actuator is connected through the rotating shaft, and the big end of the ratchet is connected with the handle of another magnetic actuator through a spring. The invention has the advantages of simple structure, convenient use, stability and reliability, and can realize non-scratch and non-stain assembly of precision ferromagnetic workpieces.

The present invention discloses an electrically-controlled in-line combined pump-tube-nozzle fuel oil injection equipment, which can be hung on the exterior of engine self-body. Said fuel oil injection equipment includes the following components: electric control unit ECU, electromagnetic valve component actuator, electric control in-line combined pump assembly, high-pressure fuel oil tank, injector, various sensors for detecting working state of engine and low-pressure, fuel oil device. Said invention also provides the concrete structure of the electromagnetic valve component actuator.

The invention relates to a float type liquid level gauge, which includes a float, a scale and a luminous wheel, and is characterized in that it also includes a conductive or magnetically conductive guide rail, and the luminous wheel includes an insulating box, a light source, and two horizontally arranged magnetic shafts Or a metal shaft and two wires that supply power to the light source. For a magnetic float level gauge, the luminous wheel also includes a magnet steel. Under the action of magnetic force, the magnetic shaft or metal shaft moves up and down along the guide rail as the float moves up and down. , timely and accurately realize the local indication of the liquid level; or by winding the resistance wire on the guide rail, the corresponding liquid level value can be obtained by measuring the resistance value in the conductive circuit composed of the guide rail, magnetic shaft or metal shaft, wire and light source, etc. Realize continuous remote transmission of liquid level data. Pulleys, counterweights, coupling ropes or coupling straps can also be included to balance the luminous wheels. The invention has the remarkable characteristics of simple structure, clear and eye-catching local indication, sensitive and accurate measurement, and continuous remote transmission signal.

The invention discloses an electromagnetic valve, comprising a valve base (2), a sleeve (5) connected with the valve base (2), and a coil (10) outside the sleeve (5). The valve base (2) is provided with a valve opening (9) and is fixed with a medium inlet pipe (1) and a medium outlet pipe (3); a static iron core (8) and a movable iron core (6') are arranged in the sleeve (5), a spring is arrangedbetween one end of the movable iron core (6') and the static iron core (8), a containing part (62') and an end part (63') are arranged at the other end of the movable iron core (6'), the containing part (62') contains a sealing element (4) that opens or closes the valve opening (9), and a gap is arranged between the end part (63') and the sealing element (4). In the invention, the reliable operation of the electromagnetic valve is guaranteed without increasing the diameter of the iron core or the cost.

This invention publicized belonged to the diesel engine fuel injection installment one kind of electric control in line combination to pump / the valve - tube - mouth to spray the diesel oil injection system. Should the injection system mainly include the electronic control unit, in line the combination pumps / the valve mechanism, the high-pressure oil pipe, the spray hole and the low pressure fuel oil system. The characteristic is in line the combination pumps / the valve mechanism plunger partner to use the direct jack-in type structure, in pump body in-line type arrangement; The plunger partner's plunger crown does not have the skewed slot, only undertakes for the oil and pressurizes the function; Integrates on in in the plunger partner plunger cavity high-pressured oil duct has the high speed solenoid valve module, solenoid valve coil and the electronic control unit is connected, by electronic control unit through solenoid valve direct control fuel injection process; This system not only causes the oil pump structure to simplify, the intensity increases, greatly enhanced has supplied the oil pressure, moreover caused for the oil process and the adjustment process decoupling, has realized through the high speed solenoid valve module to fuel injection the process direct digital control; The blow rule for a more ideal wedge, has the low initial blow rate, high host spraying rate, the fast high-pressured unloading and the remaining fluctuation of pressure are small and so on the merit: Also system layout simple, transforms few to the engine main body, the transplant is convenient.

The invention discloses a vacuum attracting and pressure regulation pneumatic cylinder. The vacuum attracting and pressure regulation pneumatic cylinder includes a pneumatic cylinder. The pneumatic cylinder is internally provided with a fixing isolation plate. A piston piece is arranged in the fixing isolation plate in a sliding mode. The center of the piston piece is provided with an air sealingpiston. The tail end of the piston piece is provided with a second air sealing piston. In this way, the interior of the pneumatic cylinder is composed of three air chambers and the air chambers are connected with a sleeving tube. When displacement of the piston piece occurs, the piston piece is matched with the flow of the air flow to be in and out of the pneumatic cylinder, so that the sizes of the air chambers can be adjusted corresponding spaces. Changing of sizes of the air chambers is used to vacuummize the sleeving tube, so that a stump and a prosthesis can suck with each other closely.Weight sense of the prosthesis during walking is greatly reduced, and in this way, matched with a user and in walking action, pressure balance of each air chamber is achieved and natural stability isachieved. A channel inside the piston piece is further provided with a floating piston and an airflow reduction screw. The airflow in the third air chamber can be adjusted to be reduced and dischargedsuitably. In this way, besides the fact that the user can obtain power to walk quickly, and the using safety can be retained.

The invention discloses a protective structure for an abutment, and relates to the technical field of abutments. According to key points of the technical scheme, the protective structure includes a pile hole formed in a soil layer, a waterproof device is arranged in the pile hole, and the waterproof device includes a concrete layer laid in the pile hole, an acid-proof steel plate installed at thebottom of the concrete layer, a plurality of groups of fixing mechanisms which are installed on the acid-proof steel plate and used for fixing the acid-proof steel plate to the soil layer, and a waterproof assembly arranged around the acid-proof steel plate; and the waterproof assembly includes inserting grooves formed around the acid-proof steel plate and an arc-shaped ring which is inserted intothe inserting grooves and connected to the inner circumferential surface of the concrete layer in an abutting mode, the arc-shaped ring is arranged protruding the top of the soil layer, the arc-shaped ring is composed of an acid-proof steel material, and a first sealing ring is arranged between the inner circumferential surface of the arc-shaped ring and the outer circumferential surface of the acid-proof steel plate. According to the protective structure for the abutment, the possibility of water in the soil layer being contact with the abutment can be decreased, and thus the service life ofthe abutment can be prolonged.