224results about How to "Unfold stable" patented technology

The invention discloses a wheel-track compound deformation track robot which comprises a machine frame and a spindle installed on the machine frame. Two deformation track wheels capable of being converted between a circle and a triangle and being provided with power devices are installed at two ends of the spindle respectively, two support frames are installed on the front side and the rear side of the machine frame respectively, and follow-up guide wheels are installed at the bottom ends of the support frames. The wheel-track compound deformation track robot has the advantages of moving flexibly, being strong in adapting capability and simple in structure and working stably.

The invention relates to a space foldable mechanism, in particular to a space foldable mechanism derived from five-revolute-pair units, aiming at solving the problem that a high-storage-ratio space foldable mechanism is not developed at present. The scheme one is that a first connecting rod is rotatably connected with a first revolute pair, the first connecting rod is connected with a second connecting rod, the second connecting rod is connected with a third connecting rod and the third connecting rod is connected with a fourth connecting rod. The scheme two is that three foldable units are arranged in the shape of a triangular closed loop. The scheme three is that six space modules are sequentially connected to form a closed loop structure. The scheme four is that a first five-revolute-pair unit is connected with a second five-revolute-pair unit, the second five-revolute-pair unit is connected with a third five-revolute-pair unit and the third five-revolute-pair unit is connected with the first five-revolute-pair unit. The scheme five is that a first umbrella-shaped module is connected with a second umbrella-shaped module, the second umbrella-shaped module is connected with a third umbrella-shaped module and the third umbrella-shaped module is connected with the first umbrella-shaped module. The space foldable mechanism derived from the five-revolute-pair units is used for spacecrafts.

A welding wire container for holding a coil of welding wire, comprising: an outer cylinder of paper; a base plate held by the interior of the outer cylinder at an indented portion of the lower portion of the outer cylinder, the base plate forming the bottom portion; A cage that moves downward as the filler wire decreases; and a ring member mounted on the cage whose outer diameter is smaller than the minimum inner diameter of the outer cylinder. The cage includes a diameter-adjustable tubular portion formed by rolling up a belt member, and a plurality of blade portions extending from an inner edge of a lower portion of the tubular portion toward the center of the tubular portion. The loop member acts as a plumb for the cage as the wire is pulled out of the container. With the above structure, the welding wire can be smoothly deployed to the bottom layer of the welding wire without being entangled with each other.

The invention relates to a longitudinal unfolding mechanism for a direct-connected folding wing. At present, folding wings of all missiles have functions of one time unfolding and locking, and the unfolding time of the folding wings of all the missiles is very short, the unfolding and locking impact is higher, and the interference on the posture of a flying missile is higher. By adoption of a direct-connected cam mechanism design idea, the reliable locking of folding wings of the missiles can be realized at a time. Power is supplied by a gas actuator cylinder and directly drives a cam to movealong a guide rail; and a driven sliding block on the missile wing is contacted with a chute of the cam and moves in the chute of the cam to realize unfolding of the folding wing. By the longitudinalunfolding mechanism, the minimization of a wrapping space of the folding wing is realized, the mechanism is compact, and high-precision and high-reliability folding, unfolding and locking can be realized easily.

The invention provides a shape memory polymer-based air filling extensible wing and methods for manufacturing the same, relates to an extensible wing and a method for manufacturing the same, and aims to solve the problem that the strength and the rigidity, needed for the flight of a plane, of the wing are not met, and the problem that the wing is easily damaged for air leak when the punching pressure is too big in the conventional air filling extensible wing. A skeleton of the wing is made of shape memory polymers. The method I comprises a step of manufacturing the skeleton of the wing comprise: designing a mould, manufacturing an uncured fiber reinforcement shape memory polymer blank, heating the blank at a temperature of between 70 and 80 DEG C for 16 to 24 hours, demoulding the fiber reinforcement shape memory polymer blank, which is heated to be cured, to obtain a corresponding wing rib or wing beam, and then connecting and fixing the wing rib and the wing beam to form the skeleton of the wing. The method II comprises: keeping warm for 60 minutes at a temperature of 75 DEG C, heating the skeleton of the wing to the temperature of 100 DEG C, keeping the temperature for 30 minutes, cooling skeleton of the wing to the temperature of 75 DEG C, and keeping the temperature for 24 hours. The air filling extensible wing of the invention meets the strength and the rigidity, needed for the flight of a plane, of the wing the sealing property of the wing is good, and the method for manufacturing the wing has an advantage of simple process operation.

The invention provides a spatially extendible annular tensioning integrated antenna mechanism, relates to antenna mechanisms, and solves the problems that a present extendible annular antenna needs lots of mechanical connection in the folding and unfolding process and further causes high total weight and low unfolding reliability. A main-end fixation member is fixedly connected with one end of a main-end connecting tube via a pin, the other end of the main-end connecting tube is fixedly connected with one end of a carbon fiber tube, two bar-shaped openings are formed in the sidewall of the main-end connecting tube along the length direction, two locking flat springs are arranged correspondingly at the positions of the bar-shaped openings, a drive spring is placed in the carbon fiber tube, an annular groove is formed in the middle portion of a guiding slide block circumferentially, when the antenna mechanism is unfolded, the lower portion of the locking flat springs are clamped in the annular groove of the guiding slide block, the lower end of the guiding slide block is connected with a slide block screw, the guiding slide block is placed at the upper end of the driving spring, an auxiliary-end fixation piece is fixedly connected with the other end of the carbon fiber tube via an auxiliary-end connecting piece, and the amount of tensioning integrated rods is an even number. The antenna mechanism is used in the field of wireless communication.

The invention discloses a medical stretcher suitable for outdoor medical rescue. The medical stretcher comprises two folding round rods arranged in parallel. Each folding round rod is formed by connecting two unit rods. Stretcher cloth and a folding circular transverse rod used for transversely connecting the two folding round rods are arranged between the two folding round rods. The medical stretcher further comprises a locking mechanism used for locking the unfolding state of the folding round rods and at least four support legs used for supporting the stretcher and capable of adjusting self height in telescopic mode. The locking mechanism is hinged between two unit rods of each folding round rod. The support legs are symmetrically hinged on the two folding round rods and are used for supporting under the unfolding state of the folding round rods and adjusting height of the stretcher. The medical stretcher is capable of being folded into smaller size, convenient to carry, capable of maintaining placement stability on uneven outdoor ground, thereby avoiding secondary damage of patients.

The invention provides a folding full-motion horizontal tail mechanism, and belongs to the technical field of folding-wing unmanned aircrafts. The mechanism comprises a left horizontal tail, a left turntable, a horizontal tail connection body, a right turntable, a right horizontal tail, torsional spring covers, a pressing screw, torsional springs, horizontal tail rotating shafts and a locking mechanism, wherein two rotating shaft mounting holes which are symmetric in the transverse direction are formed in the horizontal tail connection body; an included angle between the axis of each mounting hole and the horizontal plane is 55.5 degrees; after the horizontal tail connection body is fixedly connected with the left turntable and the right turntable, the rear end face of the horizontal tail connection body and the rear end face of a machine body form a 45-degree angle; rotating shaft mounting sleeves matched with the horizontal tail rotating shafts are arranged on the left horizontal tail and the right horizontal tail; included angles between the central axis of each rotating shaft mounting sleeve and the wing plane as well as between the central axis of each rotating shaft mounting sleeve and the wing chord direction are 45 degrees; the torsional springs are arranged on the horizontal tail rotating shafts; and the locking mechanism makes the horizontal tail rotating shafts rotate by 105 degrees and locks the horizontal tail rotating shafts, so that the horizontal tails rotate to a position vertical to the side face of the machine body from the position close to the side face of the machine body. The mechanism is connected reliably, has a simple structure, and is unfolded quickly and operated easily.

The invention relates to an automotive sunshade framework with easy automatic operation, which comprises a bottom frame, wherein a pair of driving shafts which are in front and at back parallelly is arranged above the bottom frame, and driving shaft supporting pieces are arranged on the driving shafts; both of the two ends of the driving shafts are sleeved with shaft gear, the shaft gears are fixedly connected with the driving shaft supporting pieces and the driving shafts can rotate around the driving shaft supporting pieces and the shaft gears; the two ends of driving shafts are both fixedly connected with a gear connecting piece into which a side-turning shaft is inserted and around which the side-turning shaft can rotate, the side-turning shafts pass through the gear connecting pieces to be connected with side-turning gears which are meshed with the shaft gears, and the side-turning shafts are also provided with side-turning rods; and a pair of driven shafts on which side baffling supporting rods are arranged is arranged above the bottom frame. In the invention, sunshade cloth can be folded with the turning of the side-turning rods and the side baffling supporting rods, the drawback of difficult folding of sunshade at corners in the prior art is overcome, a trouble of manual interference is saved, and automatic control is easy.

The invention relates to a redundant locking type longitudinal expansion mechanism of a folding wing. The existing missile folding wing has the once expansion locking function and has the defects of extremely short expansion time, great expansion locking impact and great posture interference on a missile in flight. The longitudinal expansion mechanism provided by the invention adopts the design idea that a worm mechanism and a ball nut are combined, wherein the mechanism can realize the once reliable locking of the folding wing; the power of a gas actuator cylinder drives the nut to move; a screw shaft is linked with a worm, thereby driving a worm gear to rotate around a wing shaft; and the locking of the folding wing is realized by utilizing the self-locking action of the worm. The longitudinal expansion mechanism provided by the invention realizes the minimization of the enveloping space of the folding wing, has the advantage of compact structure and is easy to realize the folding, the expansion and the locking with high accuracy and high reliability.

The invention discloses a deployable reflecting surface device under the traction drive of a rope. The device disclosed by the invention mainly aims to overcome the defects of the existing reflecting surface device that the unfolding speed is too fast and the reflecting surface device is difficult to control and has low reliability. The device comprises a group of hauling ropes, a folding eye bar, a folding rib rod and a plurality of connecting joints, wherein a sealed circumferential hauling rope (7) penetrates through a ring structure formed by connecting an eye bar (1) and an eye bar connecting joint (2); radial hauling ropes (8) penetrate through a rib structure formed by connecting a rib rod (3) and a rib rod connecting joint (4); one end of the rib structure and one end of each radial hauling rope are connected with the ring structure and the circumferential hauling rope through a ring-rib connecting joint (5); the other end of the rib structure is connected with a rib tube connecting joint (6); and the radial hauling rope are combined to form a hauling rope at the rib tube connecting joint, and the hauling rope is connected with an external motor. The invention has the advantages of low surface density, steady and reliable unfolding process and adjustable profile precision and can be used as a reflector or converger to be arranged in space or on the ground.

The invention relates to a flexible solar wing elastic stretching rod repetitive unfolding and retracting mechanism, which relates to the field of aerospace space mechanism. The invention solves the problems of large folding envelope, heavy weight and low specific power of the prior rigid and semi-rigid solar wing which adopts the unilateral deployment mode. The two force transmission devices of the invention are fixed on the mounting base side by side, A deployment bar is arranged on both sides of the flexible solar blanket, A flexible solar blanket is connected to the deployment lever by a rope, At that end of the flexible solar blanket is wound up on a solar blanket take-up roll, At that end of the unwrap bar is wound up on the unwrapping bar take-up drum, A distal end of that deployment bar is press against the deployment bar retracting roll by a deployment bar pressing device, Four unfolding bar guides correspond to four unfolding bars one by one. An initial driving device is arranged inside the inner guide cylinder of the unfolding bar guide. An initial pressing and releasing device is installed at one end of the force transmission device of the unfolding roller, and an electric recovery driving device is installed at the other end of the force transmission device of the unfolding roller. A space power supply for a spacecraft is provided.

The invention discloses a cubesat brake sail de-orbit device. The cubesat brake sail de-orbit device is composed of two completely identical cubesat brake sail de-orbit sub-devices. Each cubesat brake sail de-orbit sub-device comprises a de-orbit device body and a partition board arranged on the top of the de-orbit device body, wherein the de-orbit device body is of a central symmetry structure and comprises a main frame, an upper end cover, a sail storage chamber guide rail, a Hall sensor, a base plate and two expanding mechanisms, the main frame is Z-shaped, the main frame is divided into two identical chambers with the center of the main frame as the symmetry center, and the two expanding mechanisms are arranged in the two chambers respectively. Four film sails are expanded in four directions by means of tape spring masts to increase the normal sectional area of satellite movement, so as to successfully solve the problem that a cubesat stays on the original track for a long time after fulfilling a task and becomes space debris.

The invention discloses a reticulated annular deployable antenna and an antenna truss. The antenna truss comprises an annular structure formed by connecting a plurality of structural units end to end,and the structural units constitute a closed annular structure through sharing cross bars; and one of the structural unit includes four cross bars, two sliding vertical bars, two main vertical bars,two extended vertical bars, four connecting bars, a lower cross bar fixed joint, an upper connecting rod sliding joint, an upper cross bar sliding joint, an upper cross bar fixed joint, a lower connecting bar sliding joint, a lower cross bar sliding joint and four articulation joints. The bars of the structure are distributed on three plane layers along the radial direction, thereby effectively reducing the folding diameter, making full use of the folding space, and greatly reducing the folding height. Compared with similar reticulated deployable antennas, the antenna provided with the invention is significantly improved in height and diameter storage ratio, and thus increases the deployable aperture of the antenna under the condition of realizing the same folding requirements.

The invention relates to a rope-driven umbrella-shaped Cassegrain antenna main and auxiliary surface stable unfolding mechanism. The mechanism comprises a central hub, radiation ribs, a feed source horn, an auxiliary surface, a spring, a main surface rope, an auxiliary surface rope and a winding mechanism, and the central hub is a fixed component; one end of each radiation rib is hinged with the central hub; the feed source horn and the center hub are coaxially and fixedly connected to the upper surface of the interior of the center hub; the secondary surface is coaxially connected with the feed source horn; the spring sleeves the feed source horn, is in contact with the bottom of the auxiliary surface and pops up the auxiliary surface when the antenna is unfolded; the main surface rope penetrates through the slots of the radiation ribs and the holes in the side surface of the central hub, and two ends of the main surface rope are fixedly connected with the radiation ribs and the auxiliary surface respectively; the auxiliary face rope penetrates through the hole in the bottom face of the center hub, and the two ends of the auxiliary face rope are fixedly connected with the auxiliary face and the winding mechanism. According to the invention, the unfolding process is stable, the impact on the antenna is small, the radiation ribs are unfolded while the auxiliary surface is unfolded, the unfolding synchronism of the antenna is good, and the antenna can be folded automatically for multiple times.

The invention relates to an adsorption type fast film sticking device, which comprises a film unwinding part for conveying the film backward; a film pulling part for driving one end of the film to move backward to make the film unroll in a horizontal direction; a feeding part, the The feeding part is used to intermittently supply the sheet material to the film pulling part to make the sheet fit with the unfolded film; the film pulling part includes a rotating mechanism and several groups of supporting cutters which are arranged on the rotating mechanism and perform rotating motion under the driving of the rotating mechanism. A cutting mechanism and a negative pressure supply mechanism arranged on one side of the rotary mechanism; the feeding part includes a clamping mechanism for supporting the sheet material and a blanking material for controlling the sheet material in the clamping mechanism to fall intermittently with the rotation of the rotary mechanism Mechanism; the invention overcomes the problems of unstable film unfolding during the film sticking process, easy occurrence of wrinkles and inability to achieve continuous and efficient film sticking and complete film cutting while sticking the film.

The invention discloses an automatic pedal system of an electric unicycle. The automatic pedal system comprises two pedals rotationally connected to the two sides of a unicycle body through a connecting shaft, and a power switch installed on the upper portion of the unicycle body and used for controlling starting and stopping of the unicycle. The lower walls of the pedals are provided with first permanent magnets, the two sides of the unicycle are provided with first electromagnets working in cooperation with the first permanent magnets, the first electromagnets are attracted to the first permanent magnets when not powered, and the first electromagnets are repelled to the first permanent magnets when powered. Second permanent magnets are installed at the positions, below the connecting shaft, of the inner side walls of the pedals, the two sides of the unicycle body are provided with second electromagnets working in cooperation with the second permanent magnets, the second electromagnets are attracted to the second permanent magnets when not powered, and the second electromagnets are repelled to the second permanent magnets when powered. The power switch of the unicycle is used for controlling the electromagnets to drive the pedals to be unfolded and folded, and the automatic pedal system is convenient to use and high in practicality.

The invention discloses a simple parallel spreading and laminating device for a wide ultrathin membrane. The simple parallel spreading and laminating device comprises a membrane unreeling roller, a magnetic powder damper, a bent roller, a gluing roller, a flat roller and a rack. A technology comprises the steps that the wrapping angle of the bent roller and the wrapping angle of the flat roller are adjusted by setting proper unreeling tension; the relative position relation of the unreeling roller, the bent roller and the flat roller is adjusted; the protruding direction of the bent roller is adjusted; and the membrane passes through the unreeling roller, the bent roller and the flat roller and then is combined with pre-soaked cloth to complete the laminating procedure. According to the simple parallel spreading and laminating device and technology for the wide ultrathin membrane, non-uniform elastic deformation is generated in the middle area and the edge areas of the membrane through the axial stroke linear change of the bent roller and the elasticity of the membrane, the spread membrane is fixed in the weft direction through the flat roller so that the ultrathin membrane can be spread, and the problems that the ultrathin membrane has wrinkles and is unevenly spread in the unreeling process can be effectively solved; unreeling is stable, the spreading parallelism of the ultrathin membrane is good, the breadth is stable, bonding to glued fibers is good, the phenomenon that bubbles are brought due to wrinkles of the membrane is thoroughly eliminated, and the finished product rate of the pre-soaked cloth is increased.

The invention discloses a curled and folded gas filled tube clamping and unfolding control device and a method thereof, aiming at realizing curled clamping fixation and unfolding control of the curled and folded gas filled tube. The curled and folded gas filled tube clamping and unfolding control device comprises a plug device, a rigid baffle plate and a flexible baffle plate. According to the curled and folded gas filled tube clamping and unfolding control device and method disclosed by the invention, the frictional resistance between the flexible baffle plate and the curled and folded gas filled tube is used for constraining the unfolding process of the curled and folded gas filled tube, and thus violent vibration and sway caused by non-constrained unfolding are avoided. Gas is filled to the free end of the curled and folded gas filled tube, and the gas filled tube which expanded under pressure can be gradually enfolded along the edge of the flexible baffle against the constraint of the frictional resistance after the pressure reaches a certain level. The curled and folded gas filled tube clamping and unfolding control device is simple in structure, little in occupied space, low in requirements on gas filling pressure, adjustable in frictional resistance and especially applicable to unfolding control of the thin-wall curled and folded gas filled tube; no Velcro fastener is needed to be additionally arranged on the outer wall of the tube.

The invention relates to a three-structure-state transformation space deployable mechanism based on scissor units. The three-structure-state transformation space deployable mechanism based on scissorunits is formed by scissor units, hinges and chassises, wherein the scissor units can be converted into a first structure-state, a second structure-state or a third structure-state through unfolding or furling; the first structure-state is a triangular prism structure-state; the second structure-state is a quadrangular structure-state; the third structure-state is a pentagonal prism structure-state; the hinges include a double-revolute-pair hinge and a three-revolute-pair hinge; and one end of the double-revolute-pair hinge is connected with the chassises through pins, and the other end of thedouble-revolute-pair hinge is connected to the scissor units through pins. The three-structure-state transformation space deployable mechanism based on scissor units has the advantages of being lightin weight, being single in the component type, being large in the folding ratio, being small in the furled volume, being stable in mechanism deploying, and having variable three structure states, being able to be used as a polygonal space folding unit, and being suitable for an aerospace support frame and a planar transmitting antenna.

The invention belongs to the technical field of cigarettes and particularly relates to a tipping paper placing device. The tipping paper placing device comprises a box body, a paper disc shaft, a brake arm and a swing arm, wherein the paper disc shaft is arranged on the box body, the rotating speed of the paper disc shaft can be controlled by the brake arm and the swing arm, one end of the brake arm is arranged on the box body, the other end of the brake arm is connected with one end of the swing arm capable of driving the brake arm to rotate, and the middle of the brake arm is attached to the surface of the paper disc shaft; the swing arm is arranged on the box body, the two ends of the swing arm can swing up and down, and the other end of the swing arm is connected with tipping paper in a sleeving way. According to the tipping paper placing device, the swing arm and the brake arm are additionally arranged, the tension of the tipping paper can be automatically adjusted, the rotating speed of the paper disc shaft can be controlled, and the phenomenon that the tipping paper skips and deviates due to the inconsistent length of the tipping paper in the paper placing process is solved. The tipping paper placing device has the advantages of reasonability in design, simplicity in structure, convenience in use, easiness in realization, reduction in defective rate and improvement in work efficiency.

The invention discloses a space deployable mechanism designed on the basis of a posterior wing deployable mechanism of dermaptera insect earwigs. The space deployable mechanism is applied to a reflector of a satellite antenna and structurally comprises a first-grade rod set, a second-grade rod set, a third-grade rod set, a supporting rod set, a push-pull rod set, a combined hinge mechanism and a polyester film. End portions of rods in the first-grade rod set are sequentially connected through hinges. The second-grade rod set comprises rods and gears, and the gears are connected with the second-grade rods and then connected with the first-grade rods. Rods in the third-grade rod set are connected with the rods in the second-grade rod set through supporting rods. The rods in the first-grade rod set are driven so that the whole mechanism can be deployed. By the adoption of the space deployable mechanism, controllable folding and deployment of the satellite antenna of a spacecraft can be achieved, and the space deployable mechanism has the beneficial effects that the containing ratio is relatively large, and meanwhile a carbon fiber material is selected and used, so that the whole space deployable mechanism is small in weight, high in strength, good in stability and the like.

Building sun shading products are indispensable rigid demands of building energy saving. Outer sun shading facilities comprise outer shutter sun shading facilities, roller blind sun shading facilities, sailboard sun shading facilities, fixed sun shading facilities and the like. The outer sun shading facilities and equipment have more or less defects of sight shielding, small adjustable range, heaviness, large mounting difficulty, difficult later maintenance, limited heat insulation effect, poor wind pressure resistant capacity and the like. A supporting type retractable and foldable outer sun shading shutter system can be unfolded fully and folded up; a sun shading shutter base plate can be made into types of plane sun shading, plane punched sun shading, stereo grating type sun shading and honeycomb type sun shading; the outer sun shading shutter system is light in design, and different mounting positions also can be selected according to the sun shading requirement of different orientation; a certain ventilation gap exists between the sun shading shutter base plate and the sun shading face, so that the heat dissipation effect is good; and the unicity and defect that an existing sun shading product shades sun but not insulates heat are overcome completely, the overall appearance of a building is made to be attractive through the outer sun shading shutter system, and the external facade of the building is attractive while sun shading is achieved.

The invention discloses an intelligent curtain automatic sliding rail device, which comprises a connecting rail, wherein a servo drive motor is fixedly arranged at one end of the connecting rail and a connecting block is fixedly arranged at the other end of the connecting rail; a driving wheel extends upwards and is fixed on an output shaft of the servo drive motor; a transmission wheel is hinged on the top surface of the connecting block; a conveyor belt is tensioned on the driving wheel and the transmission wheel; a through groove is fixedly arranged on the bottom surface of the connecting rail; one part of the conveyor belt is located above the through groove; the part of the conveyor belt, above the through groove, is inserted in a plurality of hook connecting sliding blocks; the hook connecting sliding block, at the rightmost end of the through groove, is fixedly arranged on the conveyor belt; vertical supporting plates are fixedly connected to two sides of the connecting rail by virtue of bolts; and two sides of the servo drive motor and the connecting block are fixedly connected to corresponding sidewalls of the two vertical supporting plates by virtue of bolts. The sliding rail device can be subject to remote control by virtue of an infrared remote controller, so that a curtain is automatically folded and unfolded in an intelligent mode with a good effect; therefore, the curtain can be folded and unfolded stably.

The invention discloses an emergency supporting device for a coal mine collapse which isand convenient to quickly unfold. The device comprises a substrate, an electric push rod, a supporting rod, anabutting butt-joint rod and a pressure sensor; the electric push rod is installed on the inner side of the substrate in an embedded mode; a fixed rack is installed on a bolt of at an output end of theelectric push rod through bolts ; an installation piston is fixedly connected with the upper end of the fixed rack; a gas collecting cavity is formed in the upper end of the inner side of the substrate; the gas collecting cavity is connected with the installation piston; a gas transportation passage is installed on the outer side of the gas collecting cavity in an embedded mode; and an installation airbag is fixedly connected with the outer end of the gas transportation passage. According to the emergency supporting device for the coal mine collapse which isand convenient to quickly unfold,the pressure sensor at the upper end of the device receives a pressure signal of collapse, the electric push rod is stably driven through a preset program, and thereby the supporting rod is stably driven by an engaging structure between gears to be unfolded outwardly while at the same time the abutting butt-joint rod which abuts against the upper end of the supporting rod is unfolded upwardly to cooperate with the connecting rod to stably and quickly realize protection operation.

The invention relates to a fixed hydraulic lifting machine which comprises a base, a bearing platform, supporting arms and a driving mechanism, wherein the supporting arms are positioned on two sides of the base and are arranged in an internal-external crossed manner; the driving mechanism is used for driving the supporting arms to being relatively unfolded or folded; each supporting arm comprises a first supporting arm and a second supporting arm; the first supporting arms and the second supporting arms are arranged in an internal-external crossed manner and rotationally connected with each other; the lower end parts of the first supporting arms are rotationally arranged on the base; the upper end parts of the first supporting arms are arranged at the bottom of the bearing platform in a sliding manner; the lower end parts of the second supporting arms are arranged on the base in a sliding manner; the upper end parts of the second supporting arms are rotationally arranged at the bottom of the bearing platform; the hydraulic lifting machine also comprises first supporting rods and second supporting rods; the first supporting rods are used for connecting the lower end parts of the second supporting arms on two sides synchronously; the second supporting rods are used for connecting the middle upper parts of the supporting arms on two sides synchronously; the driving mechanism comprises hydraulic cylinders and a hydraulic pump station; two end parts of the hydraulic cylinder are respectively and rotationally arranged on the first supporting rods and the second supporting rods; and the hydraulic pump station is arranged on the base, and is positioned between the supporting arms on two sides. The fixed hydraulic lifting machine can realize the lifting of the bearing platform relatively stably.

The invention discloses portable table and chair for field operation and relates to the field of tables and chairs. The portable table and chair structurally comprise two table plates connected by a hinge, chair seats, connecting rod devices for connecting the table plates and the chair seats, and folding chair frames for respectively supporting the four chair seats, wherein the bottom parts of the table plates are provided with containing grooves for containing the chair seats, the connecting rod devices and the folding chair frames; each connecting rod device comprises a fine rod, a connecting block, a side rod and a front rod; the edges of the two sides of one surface of the connecting block are provided with grooves matched with the fine rod, and the middle part of the other surface of the connecting block is provided with grooves matched with the front rod; each folding chair frame comprises a supporting block, two chair feet and a supporting rod; the middle part of the supporting block is provided with a groove matched with the supporting rod. The portable table and chair disclosed by the invention have the advantages that due to hinge connection and arrangement of the grooves on the whole body, after the whole body is folded, the occupied space is smallest, the carrying is convenient, the unfolding is simple, and the folding is quick; the outer sides of the table plates are provided with handles, round holes for placing a sun umbrella are formed in the middle parts of the table plates, and radiating holes are formed in the chair seats, so that the use is convenient, and the design is attractive and humanized.

The invention provides an unfolding device achieving high precision, miniaturization and high torque output. The unfolding device comprises a stepping motor, a planetary gear reducer, a harmonic reducer, a rotary transformer, an output shaft, a male hinge and a shell; the stepping motor is used for providing driving power, the planetary gear reducer and the stepping motor are of an integrated structure, and the planetary gear reducer is connected with the harmonic reducer; the output shaft and the harmonic reducer are of an integrated structure, the output shaft is connected with the male hinge, and the male hinge is used for being connected with a target load; a rotor of the rotary transformer is connected with the output shaft, a stator of the rotary transformer is connected with the shell, and the rotary transformer is used for achieving high-precision control over the output shaft. The unfolding device solves the problems that the requirement for the weight of a driving mechanism is high, the load is heavy, and adaptation to lunar surface high vacuum, large temperature difference and lunar dust environments can not be achieved, the problems cannot be solved in the prior art, and the unfolding device achieves the high precision and adaptation to lunar day working and lunar night existence.