55results about How to "Compact and lightweight" patented technology

The invention discloses a paper folding type piezoelectric energy collector for collecting low-frequency energy. The paper folding type piezoelectric energy collector comprises a piezoelectric composite material paper folding cylindrical structure and two side end faces. The piezoelectric composite material origami cylindrical structure is obtained by bending and folding a planar piezoelectric composite material along a peak fold line and a valley fold line. In the bending process, the bent piezoelectric ceramic composite material can be manufactured by controlling external force in the sintering process. According to the invention, piezoelectric ceramic 3D printing is combined with a novel material inspired by paper folding. The piezoelectric ceramic suspension is used as 3D printing ink. The novel material structure is based on a Kresling origami cylindrical surface, but creases are hidden, the effective collection area is increased, and the electrical performance is improved. The multi-stable Kresling origami structure has low rigidity and a low energy barrier, so that energy collection in a low-frequency environment becomes possible, and the multi-stable Kresling origami structure is particularly suitable for ocean wave energy collection application.

The invention discloses a hand-operated self-lifting device for wire dropping of a power transmission line, which is applied to the field of high-altitude power transmission line operation and comprises an anti-falling device body, a grip, a driving rocking handle, an anti-falling chain, a buffer mechanism and the like. The anti-falling chain is wound on a specially-designed chain groove of the driving shaft body, and the shaft body is rotated by hand-cranking the driving rocking handle, so that the anti-falling chain smoothly lifts an operator. The anti-falling chain can relieve impact at the falling moment and protect safety of personnel and equipment, the hand-operated rocking handle is provided with the one-way transmission design of the ratchet wheel deflector rod and the gear ring, reverse rotation of the chain is prevented, the lifting chain groove structure, the limiting guide groove wheel and the blocking piece system are accurately matched, smooth operation of the anti-falling chain is guaranteed, blocking is prevented, and it is guaranteed that the lifting process is stable and reliable. And the O-shaped hook lock equipped with the anti-scraping protection pad can protect the power transmission line from being worn. The device is compact and light, is easy to carry and quick to deploy, and remarkably improves the safety of high-altitude operation and the reliability of the device.

The invention discloses a variable-rigidity flexible grabbing system for complex and narrow space operation. The variable-rigidity flexible grabbing system comprises a variable-rigidity bending deformation flexible arm and a foldable end effector. The variable-rigidity bending deformation flexible arm comprises a plurality of independent hollow air cavities on the periphery and a variable-rigidity fiber blocking cavity in the center. The foldable end effector includes a plurality of fingers, each finger including a non-stretchable film, a plurality of hard sheets, and an elastic film. The flexible arm realizes multi-degree-of-freedom bending through a three-cavity pneumatic bending design and a central fiber blocking variable stiffness module, and easily passes through a narrow channel. According to the end effector, through cooperation of a soft material, a hard sheet and an elastic film, multi-state conversion from folding to stretching to bending is achieved, the end effector adapts to objects of different shapes and sizes, and accurate grabbing is achieved. In addition, the telescopic flexible wrist is introduced, the freedom degree of axial extension is increased, the position error is compensated, and the grabbing precision is improved. The robot is suitable for robot operation in a complex environment, and is particularly suitable for the fields of industrial assembly, search and rescue after disasters, ocean exploration and the like.

The invention belongs to the technical field of handheld electric agricultural harvesting equipment, and discloses a handheld electric astragalus membranaceus excavating machine which comprises a main body, a soil turning assembly is arranged at the bottom end of the main body in a telescopic mode, and the soil turning assembly is in transmission connection with a driving assembly arranged on the main body and used for driving the soil turning assembly to work; the driving assembly comprises a motor arranged on the main body, the output end of the motor is in transmission connection with the input end of a gearbox arranged on the main body, and the output end of the gearbox is in transmission connection with the soil turning assembly; the soil turning assembly comprises a hydraulic sleeve arranged on the main body, and the output end of the hydraulic sleeve is in transmission connection with a soil turning shovel used for soil turning excavation. The device is compact and light in structure, easy to operate, convenient to use, capable of being used by one person, time-saving and labor-saving, the radix astragali digging efficiency is improved, manpower consumption is reduced, damage to radix astragali roots is reduced, the quality of the dug radix astragali is improved, and application and popularization are convenient.

The utility model discloses a portable small-torque wire cutter, which comprises a gun cleaning device main body, a wire cutting base, a telescopic cylinder, a wire cutting blade, a wire cutting pressing block and a material collecting channel, the wire cutting base is fixedly arranged on the gun cleaning device main body, a cylinder body of the telescopic cylinder and the material collecting channel are both fixedly arranged on the wire cutting base, and the telescopic cylinder is fixedly arranged on the gun cleaning device main body. A pin rod is fixedly installed at the front end of a piston rod of the telescopic air cylinder and installed in a long-strip-shaped hole of the wire shearing blade in a sliding mode. The wire cutter is compact and light in structure and can be directly installed on the outer side of the gun cleaning device body, the problem that the gun cleaning stroke is long due to the fact that welding wires are cut by the cutter independently is solved, the welding gun cleaning efficiency can be improved, and the tool efficiency of the whole welding operation process can be improved. The weld beading at the head of the welding wire is sheared off through matched contact of the wire shearing blade and the wire shearing pressing block, and the fallen weld beading is collected through the material collecting channel.

The invention relates to the technical field of medical robots, and particularly discloses a multi-degree-of-freedom ankle training mechanism and a simulation and movement assisting robot. The multi-degree-of-freedom ankle training mechanism comprises a base, a moving part and a telescopic driving mechanism, the moving part comprises a moving base plate, a pedal plate and a rotary driving mechanism, and the moving base plate is connected with the base through a first universal hinge; the telescopic driving mechanism is arranged on the base, and a telescopic rod of the telescopic driving mechanism is connected with the moving base plate through a second universal hinge. According to the scheme, the telescopic driving mechanism is arranged on the base, and the movement base plate and the pedal plate are driven by a simpler mechanism to rotate at multiple degrees of freedom, so that the size and movement inertia of movement parts are greatly reduced, and the overall structure is more compact and light. The motion response speed and the dynamic performance of the multi-degree-of-freedom ankle training mechanism can be improved, the multi-degree-of-freedom ankle training mechanism can be integrated into a simulation and motion assisting robot platform more easily, and the system integration degree is improved.

The invention discloses an exoskeleton fingertip integrating a fingertip sensing function and a vibration feedback capability. The exoskeleton fingertip can provide stable fingertip pressing force sensing and corresponding vibration feedback capability. The fingertip interaction force sensing part of the fingertip is composed of a hard fingertip pressing plate, a soft silica gel gasket and a group of piezoresistive film sensor arrays, and the vibration feedback part of the fingertip module is provided with vibration feedback by a vibration motor. By controlling the frequency, the amplitude and the duty ratio of the vibration motor, the simulation of the feeling of tangential force, sliding speed, textures during interaction and the like is realized respectively. According to the design, more stable fingertip force and touch feedback can be provided for the hand exoskeleton, so that more stable and finer hand teleoperation is performed, and the experience feeling of an exoskeleton user is improved.

The utility model provides a large resistance rowing machine which comprises a machine frame, a driving device, a first resistance device and a magnetic resistance device, the machine frame comprises an installation space, the driving device comprises a handle and a driving assembly, the first resistance device comprises a main shaft and a water resistance device or a wind resistance device, and the handle is suitable for driving the main shaft through the driving assembly. The magnetic resistance device is arranged in the installation space and comprises a first fixing shaft, a first magnetic resistance piece, a second magnetic resistance piece and a magnetic control assembly, the first magnetic resistance piece and the second magnetic resistance piece are arranged in parallel, the main shaft is suitable for being in speed reduction transmission with the first magnetic resistance piece through a variable speed transmission structure, and the first magnetic resistance piece rotates around the first fixing shaft relative to the second magnetic resistance piece. The magnetic control assembly is suitable for controlling the distance between the first magnetic resistance piece and the second magnetic resistance piece to achieve resistance regulation and control. The speed change transmission structure is arranged to achieve speed reduction transmission of the driving device and the first magnetic resistance piece, larger resistance can be provided for a user, and the whole structure of the rowing machine can be kept compact and light.

The utility model discloses a novel refrigeration massage head, including metal radiator, a plurality of heat dissipation channels are equipped with from inside to outside to metal radiator, the end face of metal radiator is equipped with fixed frame, be equipped with the hollow placement of fixed frame, be used for the refrigeration piece to pass, the one end surface of refrigeration piece and the end face of metal radiator are pasted, the other end surface and contact board are pasted, the contact board is fixed and is located in fixed frame, the end cap is installed to the other end surface of metal radiator, be equipped with the connecting portion on the end cap, be used for with external movable device connection, the outside of metal radiator is exposed in the outside space, adopts the mode of clamping to fix metal radiator to the outside of metal radiator is exposed, can directly contact with the outside, thereby promote the heat dissipation effect, secondly utilize the pressure difference of high -speed motion to make the heat that accumulates in the inside can smoothly lead out, further promote the heat dissipation effect.

The invention belongs to the technical field of cranes, and particularly relates to a turbine worm slewing mechanism and a crane. An outer ring of a turbine slewing bearing is fixedly connected to a frame, an inner ring of the turbine slewing bearing is connected with a rotary table, a worm is rotationally connected with the rotary table and meshed with the outer ring of the turbine slewing bearing, a power mechanism is arranged on the rotary table and connected with the worm, and the free sliding and rotating assembly is further included. A worm and a worm gear slewing bearing are matched with a motor for driving, so that the rotary table can be locked at any position, the structural micro-motion performance is good, and rotary shaking and start-stop impact are effectively improved; the worm and worm gear slewing bearing combination is large in transmission ratio, a speed reducer does not need to be arranged, and the structure is more compact and light; through the arrangement of the free sliding and rotating assembly, the driving piece drives the worm to move in parallel, the worm can be disengaged from the outer ring of the worm gear slewing bearing, self-locking is eliminated, free sliding and rotating of the rotary table are achieved, and unbalance loading is prevented.

The utility model relates to a portable tooth whitening instrument which comprises a sealing bin, the sealing bin is provided with a concave containing groove and a rotating space, one end of the rotating space extends to be communicated with the containing groove, and the other end of the rotating space extends to the edge of the sealing bin to form a notch; the bin cover is rotationally arranged at the top of the sealing bin; and the tail part of the whitening assembly is provided with an extension arm, the extension arm is rotatably arranged in the rotating space through a rotating shaft, and the extension arm is driven by an external force to rotate so as to drive the whitening assembly to be screwed in or out of the accommodating groove. Through a rotary sealing structure of the sealing bin and the bin cover, a closed storage space is formed, external pollutants and bacteria are effectively isolated, meanwhile, the size of the device is matched with that of the whitening assembly, and the whole structure is compact and light; and the whitening assembly is rotationally connected with the sealing bin through the rotating shaft of the tail extension arm, so that the use angle is allowed to be rotationally adjusted, and the component is ensured not to be separated from the main body forever.

The utility model provides a single disc type hill drop planter performance test test bench, including mechanical frame, negative pressure fan, profiling adjusting device, single disc type hill drop planter and positive pressure air pump. Mechanical frame is the support main part, and the front end installation negative pressure fan provides adjustable seed taking negative pressure, and the middle part is suspended through the elastic profiling adjusting device hill drop planter and realizes the dynamic regulation of sowing depth, and the rear end is provided with positive pressure air pump and supplies the seed cleaning and seed throwing airflow. Test bench is equipped with digital pressure monitoring system, can real -time acquisition negative pressure seed taking and positive pressure seed throwing parameter, accurate simulation sowing process under different soil working condition, realizes sowing depth, air pressure and seed throwing track multi -parameter synchronous observation, has the characteristics such as flexible adjustment, data intuitionistic, provides efficient test platform for hill drop planter performance research.

The present invention discloses a Ku / Ka dual-frequency shared portable communication antenna, belonging to the field of antenna technology. The antenna mount is a U-shaped frame, including a bottom plate and arms located on both sides of the upper surface of the bottom plate; an azimuth gear is fixed on the top of the support center, the azimuth motor is located on one side of the azimuth gear, and the azimuth output gear at the end of the azimuth motor output shaft is meshed with the azimuth gear; the housing of the azimuth motor is fixedly connected to the bottom plate of the antenna mount; a pitch pulley connected to its bearing is provided on the outer side of one arm of the antenna mount, and the shaft of the pitch pulley located on the inner side of the arm is fixedly connected to the box; the other arm of the antenna mount is connected to the corresponding wall bearing of the box; a pitch motor is also fixedly provided at the bottom of the antenna mount, and the output shaft of the pitch motor drives the pitch pulley to rotate through a belt. The present invention realizes rapid feed switching and avoids the winding of the wire group, and has a simple and light structure and high reliability.

The present invention belongs to the technical field of bridge engineering, and specifically provides a pier-beam seismic connection device and a bridge, including an upper steel plate for connecting with a main beam and a lower steel plate for connecting with a pier, the upper steel plate and the lower steel plate are fixedly connected by a plurality of vertical steel plates, two adjacent vertical steel plates and the upper steel plate and the lower steel plate are respectively enclosed to form a plurality of separate semi-enclosed spaces that are connected front to back, one of the two adjacent semi-enclosed spaces is filled with a cement-based composite material structure, and the two vertical steel plates in the other semi-enclosed space are welded and connected by a transverse partition. The device has a strong vertical connection stiffness and a weak horizontal connection stiffness, and can prevent a large horizontal force from being transmitted to the bridge piers and causing damage to the bridge piers on the basis of realizing vertical force transmission; on the other hand, by utilizing the strain strengthening characteristics of ECC and the plastic deformation capacity of the thin steel plate, the kinetic energy of the piers and beams under the action of an earthquake can be fully absorbed to prevent damage to the piers and beams in a strong earthquake.

The utility model provides an efficient compact heat dissipation structure, which comprises a first heat conduction seat, a second heat conduction seat and two side part mounting plates, and four magnetic suction clamping seats are respectively connected with four corresponding magnetic suction clamping grooves, so that the first heat conduction seat, the second heat conduction seat and the two side part mounting plates are assembled into hollow enclosure connection. Ventilation rings are installed in the middles of the two side installation plates in an embedded mode, bearing installation bases are arranged in the middles of the two ventilation rings, transmission coupling shafts are installed at bearings of the two bearing installation bases, unpowered fan blades are arranged in the middles of the transmission coupling shafts, and drainage fans are installed at inner rings of the bearings of the two bearing installation bases. The drainage fans are located at the ventilation channels of the corresponding ventilation rings. The heat dissipation device has a good heat dissipation effect, heat can be guided to the outer side of the side mounting plate, the heat dissipation effect is improved, the heat power fan principle is adopted, a motor does not need to be additionally arranged, the overall structure is optimized, and the overall structure is lighter, more compact and convenient to use.

The utility model relates to an efficient water-cooled quenching oil heat exchange cooling system, which comprises a high-temperature pump and a pipeline, and is characterized by further comprising a detachable plate heat exchanger, the detachable plate heat exchanger comprises a fixed front end plate and a movable rear end plate, and plate sheets and gaskets are sequentially arranged between the fixed front end plate and the movable rear end plate at intervals. The fixed front end plate is detachably connected with the movable rear end plate through a clamping bolt and a nut, and the plate sheets and the gaskets which are sequentially arranged at intervals are fixed between the fixed front end plate and the movable rear end plate; the quenching oil is driven by the high-temperature pump to be cooled in the plate heat exchanger, so that the temperature of the quenching oil is stable, the quenching hardness of a workpiece is effectively guaranteed, the product quality is improved, in addition, cooling water is recycled through the cooling tower, water resources can be saved, the production cost is reduced, and the quenching oil is filtered and purified through the filter. The service life of the quenching oil is prolonged, the consumption of the quenching oil is reduced and the production cost is saved.

The invention discloses a grinding device and a control method thereof, and belongs to the field of grinding tool mechanical equipment, a mounting panel is fixed to the upper side of an operation panel through a supporting plate, a power output assembly is fixedly arranged on the side face of the mounting panel, and a reversing transmission assembly, a grinding component and a tensioning device are arranged on the upper surface of the mounting panel; the material rotating assembly and the guide rail are installed on the upper surface of the operation panel, the air cylinder is installed on the operation panel, and a waste discharging opening is formed in the operation panel. The power output assembly is connected with the reversing transmission assembly and the grinding component through a belt, the reversing transmission assembly is connected with the grinding component through a belt, and the tensioning device is arranged at the joint of the reversing transmission assembly and the grinding component and is arranged at the joint of the power output assembly and the grinding component. The material rotating assembly is installed on the guide rail and connected with the air cylinder. The grinding device can solve the problems that an existing grinding device is narrow in grinding range and cannot grind a workpiece at any angle.

The utility model provides a forklift which comprises a forklift body provided with a driving source. The fork arm assembly is arranged on one side of the vehicle body and comprises a connecting part connected with the driving source; the extension arm is fixedly arranged at the lower end of the connecting part, a mounting groove is formed in the bottom of the extension arm, and a load wheel set is pivotally connected to the mounting groove; the rotating piece is pivotally arranged on the connecting part and is hinged with the vehicle body; the transmission part is provided with a first end and a second end which are opposite, the first end is hinged to the rotating part, and the second end is hinged to the load wheel set; when the driving source drives the connecting part to lift, the rotating part rotates along with the lifting of the connecting part and drives the transmission part to swing so as to drive the load wheel set to pivotally extend out of the mounting groove and abut against the ground, and the cargo tray is jointly borne by the vehicle body and the load wheel set. When the driving source drives the connecting part to descend, the rotating part rotates reversely along with descending of the connecting part and drives the transmission part to swing reversely, so that the load wheel set is driven to reversely pivot and retract into the mounting groove, and the mounting groove of the extension arm is suspended.

The coaxial cutting structure comprises a roller and a cutting device, a notch is formed in the roller, and the cutting device is arranged in the roller and does telescopic motion through the notch; the cutting device comprises a serrated knife, a mounting knife rest and a driving device, the mounting knife rest is arranged in the roller, the serrated knife is detachably connected with the mounting knife rest and located below a notch, the driving device is fixedly connected with the mounting knife rest, an arc-shaped guide groove is formed in the serrated knife, and the driving device is fixedly connected with the mounting knife rest. The output end of the driving device movably moves in the arc-shaped guide groove and drives the serrated knife to slide up and down. Stretching and retracting of the serrated knife are accurately controlled by the driving device, and the serrated knife adopts movable cutting, so that dependence on film tension is effectively reduced. And by means of the telescopic design of the serrated knife, on the premise that the cutting function is guaranteed, excessive auxiliary structures or high-power driving components are not needed, the device structure is more compact and light, the equipment performance can be improved, and the service life can be prolonged.

The utility model relates to an external water cooling device for high-temperature brazing, which comprises an exhaust fan for driving high-temperature gas to flow, a high-temperature air inlet pipeline, an air inlet connecting pipe, a heat exchanger and a low-temperature air return pipeline, the high-temperature air inlet pipeline adopts a pipeline provided with an air outlet port communicated with the hearth, the high-temperature air inlet pipeline is further provided with a water-cooling interlayer, and water injection ports are formed in the two ends of a shell of the water-cooling interlayer respectively; the air inlet connecting pipe is a pipeline provided with a water-cooling interlayer, and the two ends of a shell of the water-cooling interlayer are respectively provided with a water injection port; the low-temperature air return pipeline adopts a pipeline provided with an air inlet port communicated with the hearth, the technical problem that the high-temperature section pipeline is prone to overheating deformation is solved, water cooling outside the furnace can be carried out when gas in the furnace is at a high temperature, and the production efficiency is improved.

The present invention discloses a compact and lightweight structure of a high-power fiber laser light source, including a driving power module, a laser optical path module, and a plurality of load-bearing columns; in the present application, waste heat generated when the laser light source is working is absorbed and temporarily stored by a phase change material, and when the laser light source is on standby, the temporarily stored waste heat is dissipated by an external coolant. Since the waste heat generated when the laser light source is working does not need to be taken away in real time, the requirements for the refrigerator are relatively low; since the direct heat dissipation of the external coolant is more efficient than the contact heat transfer; it has the advantages of being compact and lightweight: the present application reduces the tiled area of ​​the laser light source through a three-dimensional design of layered and stacked driving power modules and laser optical path modules, so that the three-dimensional space is used evenly, which is also conducive to compact layout and reduced volume; the present application makes full use of the tiled area required to be occupied by the laser optical path, splits the driving power supply into several short sub-power supply devices, reduces the size in the height direction, and optimizes the spatial layout.

The utility model relates to a movable small crane, which comprises a cantilever assembly, a lifting rope, a stand column, a driving piece and a base, the base is provided with wheels, the stand column is vertically fixed on the base, the cantilever assembly is arranged on the stand column, the lifting rope is arranged on the cantilever assembly, and the end part of the lifting rope is provided with a lifting appliance. The driving part is arranged on the cantilever assembly, is in transmission connection with the lifting rope and is used for driving the lifting appliance to lift; the cantilever assembly comprises a cargo boom, a rotating arm and a connecting arm, the cargo boom is connected with the rotating arm through the connecting arm, the rotating arm is perpendicular to the stand column and rotationally connected with the stand column, and the stand column can stretch out and draw back in the axial direction of the stand column so that the height of the cantilever assembly can be changed relative to the base; a first bearing is arranged between the connecting arm and the stand column so that the cantilever assembly can rotate relative to the central axis of the stand column. The movable small crane provided by the utility model is small in overall structure, good in flexibility and capable of being used in a narrow space.

The application discloses a motorcycle, comprising a frame, a vehicle body cover arranged at least partially on the frame, a walking assembly connected at least partially to the frame, a driving assembly for driving the walking assembly, the driving assembly comprising a housing and a lubricating assembly, wherein the housing is formed with an accommodating space, the lubricating assembly comprises an oil pump and a scavenging pump assembly, the oil pump and the scavenging pump assembly are fixedly connected, and the oil pump and the scavenging pump assembly are arranged in the accommodating space. By integrally arranging the oil pump and the scavenging pump assembly, the space occupied by the lubricating system during arrangement is reduced, the driving assembly of the motorcycle is arranged more compactly and light in weight, the windward area of the driving assembly is reduced, and the resistance of the motorcycle during driving is reduced.

This utility model discloses a tail-winding pressure roller mechanism with diaphragm flattening function and a tail-winding device having the same. The tail-winding pressure roller mechanism includes a pressure roller and a support assembly. The support assembly is provided with a rotating shaft, which is rotatably connected to the pressure roller. Thus, during tail-winding, the pressure roller can press the tail-winding diaphragm against the surface of the battery cell. A gas passage for gas flow is formed inside the support assembly. The two ends of the gas passage form an air inlet and an air outlet on the support assembly, respectively. One end of the air inlet is connected to a gas supply device. Thus, during tail-winding, the air outlet releases flattening airflow to the tail-winding diaphragm, effectively preventing the tail-winding diaphragm from folding and sticking, and improving the tail-winding effect.

This utility model relates to the field of agricultural production technology, specifically a convenient hemp harvesting device, comprising: a protective shell, a connecting base fixedly connected to the lower end of the protective shell, a first connecting shaft connected to one side of the lower end of the connecting base, a cutting blade connected to one side of the outer wall of the first connecting shaft, a fixing block fixedly connected to one side of the outer wall of the lower end of the connecting base, a second connecting shaft movably connected to one side of the fixing block, a threaded groove formed on one side of the outer wall of the lower end of the fixing block, a limiting plate movably connected to one side of the outer wall of the second connecting shaft, a slot formed on the limiting plate, a connecting groove formed at the other end of the limiting plate, and a hand-tightening bolt movably connected to one side of the limiting plate. This utility model solves the problems of existing agricultural production devices having complex cutting blade fixing methods, often requiring multiple tools for disassembly and replacement, and some traditional devices lacking convenience and practicality in design, seriously affecting the progress of harvesting operations.

The utility model belongs to the technical field of agricultural machinery, and discloses a rechargeable portable green walnut peeling machine which comprises a protection box arranged on a walking vehicle convenient to move. The driving assembly is arranged in the protection box and serves as a power source for green walnut peeling. The arc-shaped peeling channel is arranged in the protection box, a first discharge port and a second discharge port are formed in the lower end of the peeling channel, and the first discharge port and the second discharge port communicate with the outside of the protection box; the peeling mechanism comprises a driving wheel and a cutter assembly which are correspondingly arranged, the driving wheel is in transmission connection with the driving assembly, and the cutter assembly is arranged in an arc shape and elastically installed in the peeling channel. The green walnut peeling device is light and compact in structure, flexible to operate, high in protection performance, convenient to flexibly use in an orchard, wider in application range, higher in peeling efficiency of green walnuts in the orchard and higher in quality of obtained walnuts, and is suitable for large-scale popularization and application.

This utility model provides a vacuum shell suction device, belonging to the technical field of shell suction devices. It solves the technical problems of high purchase cost and inflexibility in small pond operations of existing shell suction devices. A vacuum shell suction device includes a cylindrical outer shell, with one end closed to form a sealing section and the other end open to form an inlet section. An air suction pipe is fixedly connected to the outer side of the outer shell, and a vacuum pump for vacuuming is connected to the outside of the air suction pipe. A shell suction component is fixedly installed inside the outer shell, forming an air suction chamber between the outer shell and the shell suction component. A filter screen is fixedly connected between the inlet section and the shell suction component. The air suction chamber connects the inner channel of the air suction pipe and the mesh of the filter screen. One end of the shell suction component extends outward from one end of the sealing section to form a shell outlet, and the other end is a shell suction port. A sealing cap is oscillatingly connected to the end of the shell suction component at the shell outlet. A suction pipe is fixedly connected to the outside of the inlet section. This utility model has a compact and lightweight overall structure, suitable for flexible operation in complex environments such as shallow seas and ponds.

The utility model discloses a pedal travel simulator which comprises a hydraulic unit with a piston cavity and a simulator unit with a piston, a shell, a spring I, a spring II, a rubber spring, a simulator ejector rod and an overflowing hole disc. The shell and the hydraulic unit are fixed to form a closed space in the mode that the shell is opposite to an opening of the piston, the two ends of the spring I act on the shell and one end side of the overflowing hole disc respectively, the two ends of the spring II act on the piston and the other end side of the overflowing hole disc respectively, and the simulator ejector rod is of a T-shaped structure comprising a leg part and a head part. The leg part penetrates through the overflowing hole disc and the spring I from the other end side of the overflowing hole disc to be fixed to the bottom of the shell, the rubber spring is arranged in the piston, one end of the rubber spring acts on the piston, and the other end of the rubber spring can act on the T-shaped head of the simulator ejector rod. Therefore, the force value can be accurately controlled, the overall size and weight are reduced, and the structure is compact and light.

The invention relates to a variable-rigidity metatarsophalangeal joint based on torsion spring and connecting rod combination and a foot type robot. The variable-rigidity metatarsophalangeal joint comprises a rear sole, a front sole, a metatarsophalangeal joint rotating shaft, a torsion spring, a connecting rod, a supporting and pulling rod and a driving module. The front sole is rotationally connected with the rear sole through a metatarsophalangeal joint rotating shaft; the supporting and pulling rod is connected to the driving module and the connecting rod, the metatarsophalangeal joint rotating shaft is sleeved with a spring ring of the torsional spring, the torsional spring is hinged to the other end of the connecting rod, and the other end of the torsional spring is connected with the forefoot; the driving module is fixedly arranged on the rear sole and used for driving the supporting and pulling rod to reciprocate along the rear sole. The supporting pull rod slides to drive a spring coil of the torsional spring to rotate forwards or reversely around a metatarsophalangeal joint rotating shaft through the connecting rod, and the front foot sole is driven to do back stretching or plantar flexion movement relative to the rear foot sole. The supporting and pulling rod enables the torsion spring to generate different torsion angles when the front sole bears external force at different sliding positions, the rigidity of metatarsophalangeal joints is changed, back stretching and plantar flexion movement can be actively achieved, and meanwhile the rigidity and angle adjusting capacity is achieved.

The invention discloses a radioactive substance adsorption sampling device which comprises an inlet shell, a middle shell and an outlet shell which are connected in sequence, the inlet shell and the outlet shell are each provided with a cavity structure with the two ends communicated, the inlet shell is provided with a first airflow channel, and the outlet shell is provided with a second airflow channel; a porous third airflow channel is formed in the middle shell, an aerosol filtering layer is arranged between the inlet shell and the middle shell, and a radioactive iodine adsorption container is arranged in the second airflow channel of the outlet shell; gas flows into the first gas flow channel of the inlet shell, sequentially passes through the aerosol filtering layer, the third gas flow channel and the radioactive iodine adsorption container, and then flows out of the outlet shell from the second gas flow channel. The adsorption sampling device is used in a radioactive gas sampling system of a nuclear power station, and is convenient to use and relatively good in performance.