172results about How to "Big work schedule" patented technology

The invention relates to a large axial eddy current damper manufactured through a spiral transmission method. The axial eddy current damper based on the spiral transmission method comprises a spiral pair transmission assembly and a rotary eddy current damping generator. The rotary eddy current damping generator comprises an upper disc and a lower disc which are consistent in size, are vertically parallel and are made of magneto-conductive materials, wherein a rotary disc which is parallel with the upper disc and is made of electricity-conductive materials or magneto-conductive materials is arranged between the upper disc and the lower disc, the rotary disc is installed on the spiral pair transmission assembly and rotates along with the spiral pair transmission assembly, a plurality of pairs of magnets are further arranged between the upper disc and the lower disc, and the opposite magnetic poles of an upper magnet and a lower magnet of each pair of magnets are opposite in polarity. According to the axial eddy current damper based on the spiral transmission method, axial movement of a controlled structure is converted into the rotary movement of an inner structure of the damper to be controlled through a spiral pair, the control efficiency is largely improved, and the ratio between the damping force of the axial eddy current damper and the self weight is improved to the level equal to that of a viscous fluid damper or higher level.

The invention relates to a large-sized axial eddy current damper manufactured by using screw drive. The damper comprises a drive component and an eddy current damping generator, wherein the drive component comprises a screw drive pair, a stator and a rotor; the stator and the rotor are made of a magnetic conductive material; the screw drive pair comprises a screw and a nut which is arranged on the screw in a sleeving manner; the screw penetrates through an upper flange central hole of the stator and a lower flange central hole of the stator in sequence, and the nut is arranged in the stator; the rotor comprises an outer rotor and an inner rotor of which the bottom is provided with a lower connecting flange; one or more eddy current damping generators are arranged between the stator and the rotor. According to the damper, the damping coefficient and the inertial mass moment of the rotary eddy current damping part can be enlarged by hundreds of thousands of times to be converted into extremely large axial damping coefficient and axial equivalent added mass; meanwhile the problem that the axial damper with a large damping coefficient and the anti-seismic damper with a simulation speed index of being less than 1 are difficult to manufacture by using the rotary eddy current damping is solved.

The invention relates to a laser forming machine. The laser forming machine comprises a rack (1), a feed system (2), a powder laying hopper, a motion system (3), a discharging and collecting box, forming cylinders, a forming cylinder piston motion drive system and an optical system, wherein the optical system is composed of a laser device, a scanning galvanometer and a reflecting and focusing mirror. The laser forming machine is characterized in that the forming cylinders are more than two telescopic cylinders. As the telescopic forming cylinders are adopted, operating strokes of forming cylinder pistons can be increased under the circumstance of not increasing the height of a working table board and the height of equipment, the size of machined parts is increased, and operability and reliability of the equipment are improved.

The invention relates to a flexion type acceleration switch. In the switch, a tilted support beam, a mass block and a height adjustable contact component in a group are arranged in an insulation encapsulated shell of the switch, wherein the tilted support beam is of a double layer structure; two ends of the support beam are fixed at two sides of the shell; the double layer tilted support beam supports the mass block in a certain angle alpha to ensure that the mass block is balanced and suspended in an inner cavity of the insulation encapsulated shell; a contact is arranged on the bottom of the mass block; the height adjustable contact is arranged on the insulation encapsulated shell right under the mass block, and remains a certain distance from the mass block; when the double-layered tilted support beam is bent under the action of exterior threshold inertia force, the mass block moves along the exterior acceleration velocity to ensure that elastic contact is formed between the contact on the mass block and the height adjustable contact, and extrudes the contact to form stable contact by means of flexion elastic force. The acceleration switch is characterized by simple structure, adjustable threshold value and strong interference resistance.

The invention relates to a portable double-coil electromagnetic riveting device which comprises a rear gun barrel and a front gun barrel. The front gun barrel slides relative to the rear gun barrel in a reciprocating mode through a damping system. A primary coil is fixedly connected into the front end of the front gun barrel. A sliding secondary coil is arranged at the front end of the front gun barrel in a sleeving mode and located beside the primary coil. The front end face of the primary coil is fixedly connected with a riveting die through an amplifier. The rear end face of the primary coil is fixedly connected with an intermediate spindle penetrating through the primary coil. The intermediate spindle slides relative to the rear gun barrel and the front gun barrel in a reciprocating mode through an elastic limit mechanism and a guide mechanism. The primary coil and the secondary coil are electrically connected. According to the double-coil self-excitation principle, currents with uniform wave forms are loaded to the coils at the same time, so that the riveting energy is increased, and the energy utilization rate is improved. Through a buffering spring, recoil energy is stored in the elastic potential energy of the buffering spring, and a one-way damper consumes energy to reduce vibration sense in the rebounding process.

The invention discloses a pump-valve composite two-degree-of-freedom electro-hydraulic motion loading control method. According to the method, a pump-valve composite two-degree-of-freedom electro-hydraulic motion loading system is subjected to loading control, a speed servo subsystem and a pressure servo subsystem are subjected to independent coordination by a speed command planner to achieve two-degree-of-freedom servo control of speed and output force of a loading actuator, a speed controller controls rotating speed of a motor according to speed reference commands generated by the speed command planner, control of pressure of a chamber A and a chamber B of the loading actuator is achieved by adjusting displacement of a valve core of a loading valve, and further, the output force of the loading actuator is controlled to equal loading commands. The pump-valve composite two-degree-of-freedom electro-hydraulic motion loading control method achieves physical decoupling of steering engine motion interference, is high in loading precision and energy efficiency and is particularly applicable to high-power loading occasions.

A rolling mass tuning damper belongs to the technical field of energy dissipation and damping of civil engineering structures and is a damping energy consumption device which utilizes the mass tuning damper at the top of a high-rise building to control vibration of the building and reduce structure response under wind load and earthquake load. A gear is fixed with a large-mass round disc, a circular support seat with a rack is fixedly installed on a building structure, the gear is meshed with the rack of the circular support seat with the rack, and a dissipation damping liquid tank or a friction piece is installed on the lower portion of the circular support seat with the rack. When the radius of the large-mass round disc is located at the lowest point of the circular support seat with the rack, the round disc partially stretches into the dissipation damping liquid tank to dissipate energy, or is in friction with the friction piece to dissipate energy. The rolling mass tuning damper is capable of remarkably increasing equivalent mass under the condition that gravity load is not remarkably increased, greatly reduces dynamic response of the structure under horizontal load accordingly, is stable in damping effect, simple in structure, safe, reliable, good in durability, strong in designability and capable of effectively improving comfortableness of the high-rise building.

The invention discloses a plane parallel three-degree-of-freedom precise operating platform which comprises a base and an objective table arranged on the base; the base is fixedly connected with three supports, and the objective platform is connected with the three supports mutually through three flexible transmission connecting rods; the three flexible transmission connecting rods are distributed around the objective table, and one end of each flexible transmission connecting rod is fixedly connected to the objective table, and the other end of each flexible transmission connecting rod is fixedly connected with the support corresponding to the flexible transmission connecting rod; a resistance strain gauge and a piezoelectric bimorph are pasted on each flexible transmission connecting rod; each two connecting lines of geometric centers of the connecting parts of the supports and the flexible transmission connecting rods form a triangle; each two connecting lines of geometric centers of the connecting parts of the flexible transmission connecting rods and the objective table form another triangle; and the resistance strain gauge and the piezoelectric bimorph are connected with a closed loop feedback control system which enables the objective table to implement plane two-degree-of-freedom shifting motion and rotating motion around the geometric center of the objective table. The plane parallel three-degree-of-freedom precise operating platform provided by the invention has the advantages of simple structure, small mounting space, and high motion accuracy and positioning accuracy.

The invention discloses a multi-dimensional floater type parallel ocean power generation device. The device comprises a floater, a movable platform and a fixed platform. A bottom table is of a vertically-through structure, the floater is located under the bottom table, and the movable platform is located in the center of the bottom table. The floater is connected with the movable platform through a linkage rod. The top end of the movable platform is connected with a top table through a first linkage portion. The side face of the movable platform is connected with the bottom table through three second linkage portions. The first linkage portion comprises a first hydraulic cylinder, the top end of the first hydraulic cylinder is connected with the top table through a first hooke joint, and the rod end of a hydraulic rod of the first hydraulic cylinder is connected with the movable platform through a second hooke joint. Each second linkage portion comprises a second hydraulic cylinder, one end of each second hydraulic cylinder is connected with the inner wall of the bottom table through a universal joint, and the rod end of a hydraulic rod of each second hydraulic cylinder is connected with the side wall of the movable platform through a ball pair. The multi-dimensional floater type parallel ocean power generation device is large in operation space, has multiple freedom degrees, can absorb ocean energy from multiple directions, and is high in work efficiency.

The invention provides a multistage telescopic electric cylinder, relates to the field of transmission technologies, and is applicable to manufacturing multistage telescopic electric cylinders. The multistage telescopic electric cylinder comprises a cylinder barrel, N stages of transmission mechanisms, N-1 stages of balls, N-1 stages of transmission keys and N stages of guide keys. The N stages oftransmission mechanisms sequentially sleeve one another; each stage of transmission mechanism comprises a lead screw, a push rod and a nut; a body of each stage of nut sleeves the corresponding leadscrew, and the tail end of an extension portion of each stage of nut is fixedly connected with an end of the corresponding push rod; a plurality of outer annular raceways are arranged on the outer surface of the body of each stage of nut except for the N stage of nut; a plurality of inner annular raceways are arranged on the inner surface of each stage of lead screw except for the first stageof lead screw; each stage of balls is embedded in spaces between the outer annular raceways of the corresponding current stage of nut and the inner annular raceways of the corresponding next stage oflead screw. The multistage telescopic electric cylinder has the advantage that large working stroke can be provided by the multistage telescopic electric cylinder under the condition of small radial assembly dimensions.

An adjustable support frame used for drilling a hole upward and vertically comprises a base, wherein an upright column is arranged on the base, a push rod is connected with the upright column through slide rails in a manner of sliding along an upright column axis; a mounting part used for mounting a drilling machine is arranged at the upper end of the push rod; a winding device is arranged on the upright column; and a rope of the winding device is connected with the lower part of the push rod through a pulley device. With the adoption of the adjustable support frame used for drilling the hole at the top, the adopted slide rails are matched with a U-shaped part provided with self-lubricating slide strips, and a pulley block is taken as lifting power, so that linear movement of the drilling machine is achieved; the vertical accuracy for drilling the hole is high, and the operation is facilitated; the slide rails which are arranged in a staggered manner are adopted, so that the frame is suitable for processing and manufacturing; and further, a structure provided with multi-row mounting racks is adopted, so that drilling for multi-row holes can be facilitated simultaneously. Besides, the adjustable support frame is convenient to use and labor-saving, reduces the labor intensity of an operator, improves the work efficiency and facilitates safe construction.

The invention discloses a two-way directional force output air-powered flexible drive device, comprising an end cover, a first rubber tube, and an air-powered flexible drive device constructed by springs embedded in the wall of the rubber tube; a piston cylinder is arranged in front of the air-powered flexible drive device, a second rubber tube is sheathed outside the air-powered flexible drive device in an air-tight way, and the front end of the second rubber tube is sheathed at the rear end cover of the piston cylinder; the piston cylinder is provided with a front airport and a rear airport with a piston body arranged between the front airport and the rear airport; the piston body is connected with a hollow piston rod, the rear end of the piston rod is connected with the front end cover of the air-powered flexible drive device, and the piston rod is communicated with the inner cavity of the piston cylinder communicating the front airport and the inner cavity of the air-powered flexible drive device; the rear end cover of the piston rod is provided with through holes which is communicated with the inner cavity of the piston cylinder communicating the rear airport and the inner cavity of the second rubber tube. The invention has the advantages of flexible motion, good flexibility, high stiffness, large stroke and similar movement mode with the animal muscles.

The invention discloses a single outstretch pole magneto-rheological damper with an annular piston. A working cylinder of the single outstretch pole magneto-rheological damper with the annular piston has an inner-layer structure and an outer-layer structure; the annular piston is installed in an annular cavity between an inner layer and an outer layer of the working cylinder; and the annular piston is used for compensating volume change in the working cylinder caused when a piston rod enters and departs from the working cylinder so as to increase the working stroke of the magneto-rheological damper.

The invention belongs to the technical field of anchor drilling machines, in particular to a hydraulic driving two-stage feeding dovetail groove guiding asymmetrically-arranged anchor drilling machine, solving the problems existed in the conventional anchor drilling machine. A carriage assembly of the hydraulic driving two-stage feeding dovetail groove guiding asymmetrically-arranged anchor drilling machine comprises a carriage; the rear end of the carriage is of an outer dovetail shape; the rear end of the carriage and a front guiding pressure plate with an inner dovetail shape form a translational pair; a short feed oil cylinder and a long feed oil cylinder are respectively arranged outside the carriage assembly and symmetrically arranged at two sides; the back side of a frame assembly is connected to a rear guiding pressure plate; the rear guiding pressure plate is of the inner dovetail shape; the rear guiding pressure plate and an outer dovetail guide rail in the sleeve of a support column assembly form the translational pair; a drilling box assembly is arranged at the front side of a guiding connection plate; the back side of the guiding connection plate is provided with the inner dovetail shape; and the back side of the guiding connection plate and the carriage of which the front end is of the outer dovetail shape form the translational pair. The hydraulic driving two-stage feeding dovetail groove guiding asymmetrically-arranged anchor drilling machine, disclosed by the invention, has the advantageous effects of complete functions, compact structure, adaptability for various types of working conditions, convenience for installing on underground carrier equipment, high anchor drilling efficiency, good anchor installation quality, high automation degree and low labor intensity.

The invention discloses a novel connecting-rod type mechanical arm. The mechanical arm comprises a rack, a horizontal moving assembly arranged on the rack, a lifting assembly and a material taking assembly. The horizontal moving assembly comprises a first horizontal motor, a first horizontal carrying plate, a second horizontal motor and a second horizontal carrying plate, wherein the second horizontal carrying plate is connected with the first horizontal carrying plate in a sliding mode, the first horizontal motor drives the first horizontal carrying plate to move horizontally, and the second horizontal motor drives the second horizontal carrying plate to move horizontally. The lifting assembly is arranged on the second horizontal carrying plate and comprises a lifting motor and a lifting carrying plate connected with the lifting motor in a transmission mode, and the lifting motor drives the lifting carrying plate to ascend and descend. The material taking assembly comprises a mechanical arm body arranged on the lifting carrying plate and at least one suction foot arranged on the mechanical arm body, wherein each suction foot is provided with a vacuum sucker or an electromagnet assembly. The novel connecting-rod type mechanical arm is simple in structure, the cost is low and the requirement for arrangement of a die and a punch press is low and capable of effectively improving the integral production efficiency of products and lowering production cost.

The invention discloses an inner-channel vehicle suspension system magnetorheological damper, which comprises a cylinder barrel; a combined electromagnetic piston and a floating piston are arranged in the cylinder barrel in sequence from top to bottom; the combined electromagnetic piston divides the cavity chamber above the floating piston into an upper cavity chamber and a lower cavity chamber, which are filled with magnetorheological fluid; a bottom cover is arranged at the bottom end of the cylinder barrel; the bottom cover is respectively fixedly connected with an inflating and deflating valve and a lower lifting ring; a guide seat is arranged at the upper end of the cylinder barrel; the upper end of the guide seat tightly covers an upper end cover pressing the guide seat; the lower end of the guide seat is fixedly connected with a buffering block; the combined electromagnetic piston is fixedly connected with a piston rod penetrating through the guide seat and the upper end cover to extend outwards; the outer end of the piston rod is fixedly connected with an upper lifting ring of which the inside is provided with a wire outgoing groove. The inner-channel vehicle suspension system magnetorheological damper is simple in structure and low in manufacturing cost, can accurately adjust vehicle vibration generated by random excitation of a road face, and is high in work efficiency and work stability; the floating piston is enabled not to be clamped in the moving process up and down, and is stable when being used for pressure compensating; the liquid cannot easily leak in the work process.

The invention relates to a large-stroke leveling lifting mechanism, which is characterized by comprising a loading upper platform, a loading lower platform, lifting driving mechanisms and lifting driving mechanism mounting bases, wherein four lifting driving mechanism mounting bases which are in rectangular distribution are arranged, each of the lifting driving mechanism mounting bases is provided with one lifting driving mechanism, each mounting base comprises at least two mounting base support legs and a middle support frame, the mounting base support legs are fixedly connected to the loading lower platform, the support frames are connected to lifting driving mechanism shells, and the top ends of the lifting driving mechanisms are connected to the upper loading platform by ball hinges. The lifting mechanism is small in size, high in carrying capacity, simple in control manner and suitable for large-stroke lifting of large-mass workpieces.

The invention provides a two-section-type righting electric pole correction device comprising a worktable, a first righting arm, a first jack pushing the first righting arm, a second righting arm and a second jack pushing the second righting arm. The bottom of the second righting arm is fixed on the worktable; the top of the second righting arm is rotationally connected with one end of the first righting arm, and the other end of the first righting arm abuts against an electric pole; the first jack is operated to push the first righting arm so as to achieve first-section righting of the electric pole; and the second jack is operated to push the second righting arm, and the second righting arm pushes the first righting arm to achieve second-section righting of the electric pole. The working stroke of the electric pole correction device is increased to remedy the defect of the short strokes of the jacks, and the application range of the electric pole correction device is widened; and by righting the electric pole for the two times, the accuracy of electric pole righting is improved, and the correction effect of the electric pole is guaranteed.

The invention discloses a low-quality long-stroke outer wall spraying device. The low-quality long-stroke outer wall spraying device comprises a lifting system, a spraying system and an anti-vibrationsystem. The lifting system is composed of a top frame, lifting ropes, fixed pulleys, rope connectors and wire wrapping rollers. The lifting system is connected with the spraying system through the lifting ropes. The spraying system is composed of movable pulley groups, a hanging basket, spring passive ropes, a spray gun, driving ropes, a motor and a steering supporting seat. The movable pulley groups are symmetrically arranged on two sides of the hanging basket, the wire wrapping rollers rotate to synchronously contract and release the lifting rope, and accurate positioning of the spraying system is realized. The driving ropes and the spring passive ropes are separately connected with the head and tail of the spray gun, and multi-degree-of-freedom and large-range spraying functions of thespray gun are realized. The anti-vibration system is mainly composed of a rotor wing mechanism and installed below the spraying system, and the stability of the mechanism is ensured. According to thelow-quality long-stroke outer wall spraying device, accurate positioning of the spraying system is realized through a two-stage rope system, mass is light and the motion stroke is long, and an idealdevice for outer wall spraying is achieved.

The present invention relates to a suspended hydraulic prop stanchion, most suitable for support of mine underpit working face. It is mainly formed from oil cylinder, movable prop, sealing cover, reset spring, top cover, bottom seat, pin joint screw and three-way valve. Said invention also provides the connection method of all the above-mentioned components and their actions. Said invented hydraulic prop stanchion is compact and reasonable in structure, good in stability, high in strength, large in load-bearing capacity, light in weight and good in safety, so that it has extensive practicality.

The invention provides a multi-stage double-acting oil cylinder of a hydraulic road lifter. In this oil cylinder, a central plunger barrel is arranged on the bottom plate, and a plurality of coaxial cylinder barrels are arranged in sequence outside the center plunger barrel. Except for the outermost cylinder barrel, the cylinder wall of each cylinder barrel Oil passages are provided, and the oil passages communicate with the oil passages; the oil inlet is also provided with a second oil inlet, and the second oil inlet is arranged on the outer wall of the outermost cylinder and passes through the outermost The cylinder wall of the outer cylinder communicates with each oil passage in turn. The invention is a multi-stage double-action lifting oil cylinder, which has a large working stroke, high working pressure and large ejection force. The three-stage oil cylinder is tested and detected; the working stroke of the oil cylinder can reach 284mm; the allowable working pressure can reach 30MPa; The gravity can reach 70 tons; and the structure is compact. When the oil cylinder is in the retracted state, the total height of the three-stage oil cylinder is only 220mm, which is easy to operate and can be used in various places including small spaces for lifting operations.

The invention relates to a push-and-pull vehicle device, which is arranged on a trolley of a kiln vehicle in a conveying parallel rail and is used for pushing and pulling the kiln vehicle. In the device, two groups of front and rear moveable pulleys are arranged on a rigid member and are driven by an oil cylinder; a chain is connected with a support capable of adjusting the elasticity of the chain after winding the front and rear moveable pulleys and then is fixed on a trolley frame; the two ends of the push-and-pull vehicle used for pushing and pulling the kiln vehicle are hinged with the chain and horizontally moves forward and backward along with the chain; a convex plate used for controlling the push-and-pull vehicle to push and pull the vehicle is arranged on the rigid member which is connected with the front and rear moveable pulleys; and one end of an anti-dumping device and an anti-equilibrium device are arranged on the trolley frame. The device has the characteristics of large thrust, long travel of the push-and-pull vehicle and stable action during pushing and pulling the vehicle. After the device is arranged on the trolley, the kiln vehicle can be pulled on the trolley; the whole array of the kiln vehicle group can be pushed continuously after the kiln vehicle is pushed out of the trolley; and the area and self-gravity of the equipment are reduced by over a half. The device is also applied to equipment which has the requirements on large thrust, long travel and stable movement in the horizontal direction.

The invention discloses a motor wholly-moving type two-level electric cylinder. A motor and a transmission system are integrally design, so that the motor wholly moves. The electric cylinder can achieve two-level transmission, a first-level threaded rod is fixed, a motor rotor can drive a first rotating barrel to rotate, and a first sleeve is pushed out through a motor front end cover; meanwhile, due to the fact that a first nut can move forwards in the axial direction along with rotation of the first rotating barrel, a second sleeve is pushed out, and then two-level pushing is finished. The electric cylinder has the advantages of being capable of being integrally designed, simple in structure, convenient to maintain, good in servo control performance, long in working stroke and the like.

The invention relates to a shockproof dial SF6 gas density relay which comprises a base, a cross beam, at least one regulating lever, the micro switches which are set in pairs with the regulating levers and various operating arms which are installed on various micro switches. The invention is characterized in that the invention also comprises a reinforcing mechanism which reinforces the micro switches, namely, reinforces the housing for the micro switches, or a reinforcing mechanism which limits the operating arm of the micro switches and the regulating levers while the reinforcing mechanism reinforces the housing of the micro switches. The reinforcement mechanism is installed in the housing and comprises at least a reinforcing part which is fixed in the housing of a selected micro switch. The micro switches and the base are installed on both sides of the cross beam and the micro switches are installed on top of the corresponding regulating levers. The invention has completely eliminated the oil leakage problem and needs not fill silicon oil and has the advantage of shock resistance. The invention can be well applied to the SF6 electric devices.

The present invention relates to transportation technology, and is especially one kind of integrated efficient pollution-free vehicle. The technological scheme of the present invention is that the integrated efficient pollution-free vehicle includes gear- box, power generator, engine and foot brake. The present invention features the engine of efficient RE motor with one end connected through the clutch to the gear -box and the other end connected to flywheel; and the other clutch set in the driving side of the motor shaft, with small gear meshed to the flywheel and connected to the foot brake.

The invention discloses an electric AMT gear selecting and shifting mechanism. The electric AMT gear selecting and shifting mechanism comprises a gear selecting driving motor and a gear shifting driving motor, which are fixed on a housing; the output shaft of the gear selecting driving motor is matched with the head end of a gear selecting lead screw in a transmitting manner through a gear selecting coupler; the output shaft of the gear shifting driving motor is matched with the head end of a gear shifting lead screw in a transmitting manner through a gear shifting coupler; the gear selecting lead screw and the gear shifting lead screw are perpendicular to each other; the gear selecting lead screw is matched with a gear selecting and shifting block in a transmitting manner in the medial axis direction of the gear selecting lead screw through a gear selecting slide block; the gear shifting lead screw is matched with the gear selecting and shifting block in a transmitting manner in the medial axis direction of the gear shifting lead screw. According to the invention, not only the gear selecting and shifting force output by the gear selecting and shifting mechanism can be improved, but also the layout space of the gear selecting and shifting mechanism in the vertical direction can be reduced, and power transfer stability of the gear selecting and shifting mechanism is improved.

A double-extension suspended type hydraulic upright column comprises an oil cylinder, a middle cylinder, a plunger, a top cover with an ear plate or hemispherical body at upper end thereof, a pedestal with an ear plate or hemispherical body at lower end thereof, a cylinder sleeve, a column sleeve, a clamping band, a guide ring and a sealing element, wherein the lower part of the plunger is provided inside the middle cylinder, the column sleeve is provided outside the plunger and at the outflow point at the upper end of the middle cylinder; the lower part of the middle cylinder is provided inside the oil cylinder, the cylinder sleeve is provided outside the middle cylinder and at the outflow point at the upper end of the oil cylinder; the clamping band and guide ring are provided outside the lower end of the plunger and middle cylinder, the top cover is provided on the plunger, the oil cylinder is provided in the pedestal, and a liquid inlet / outlet through-hole is provided on the pedestal and communicated with larger variable sealing cavity; a liquid inlet / outlet through-hole is provided on column sleeve and communicated with the middle cylinder; and a liquid inlet / outlet through-hole is provided on the cylinder sleeve and communicated with the oil cylinder. The invention has the advantages of compact and reasonable structure, no welding seam structure, good stability, high strength, large carrying capacity, large working stroke, light weight, good sealing performance, long service life, low cost, wide application range, and good practicability.

The invention discloses a dual-threshold three-stable-state collision sensor, belonging to the technical fields of precision micro electro mechanical systems and collision sensors. The dual-threshold three-stable-state collision sensor is mainly characterized in that an outer mass block, an inner mass block, parallel beams, a fixed block, a first contact and a second contact constitute an inside / outside-nested bilayer oblique support beam structure. According to the invention, the collision strength grade can be judged quickly and a control signal can be sent out without a processor and a driving device. When no dangerous conditions exist, the sensor is in a first stable state, when external collision strength exceeds a first danger threshold value and smaller than a second danger threshold value, the inner mass block rapidly comes into contact with the first contact, and the sensor is in a second stable state; when the external collision strength exceeds the second danger threshold value, the outer mass block and the inner mass block come into contact with the first contact and the second contact rapidly at the same time, and the sensor is in a third stable state; and when two collisions occur continuously, the first contact and the second contact of the sensor are connected in sequence. The dual-threshold three-stable-state collision sensor disclosed by the invention has the characteristics of simple structure, multi-threshold-value intelligent sensing capability, reliability in contact, no need of driving, and strong electromagnetic interference resistance.

The invention discloses a small-volume heavy-duty multi-stage electric cylinder. The small-volume heavy-duty multi-stage electric cylinder comprises an electric cylinder body, a motor, and a reductiongearbox; the electric cylinder body is provided with a planetary ball screw shaft, a hollow ball screw shaft, a guide rod, an inner supporting sleeve, and an outer supporting shell body from the inside to the outside, wherein the planetary ball screw shaft, the hollow ball screw shaft, the guide rod, the inner supporting sleeve, and the outer supporting shell body are coaxial; linear motion of asupporting plate is realized through cooperation of a guide key groove formed in theouter circle of the supporting plate and an outer guide key arranged on the inner circle of the outer supporting shell body, the hollow ball screw shaft is connected with a hollow ball screw nut in a threaded mode and fixedly connected with one end of the guide rod through the hollow ball screw nut, and linear motion of the hollow ball screw nut is realized through cooperation of the guide key groove formed in the outer circle of the hollow ball screw nut and an inner guide key arranged on the inner circle of the inner supporting sleeve; and the reduction gearbox is fixedly connected with the motor and fixedly connected with the planetary ball screw shaft through a worm wheel, and a reduction gearbox shellbody is fixedly connected with one end of the outer supporting shell body. The space volume is reduced, thus axial stiffness is significantly increased, and the bearing capacity is enhanced.