91results about How to "Increase elastic potential energy" patented technology

The invention discloses a gliding robot capable of autonomously flying in a salutatory mode, which comprises a frame, a bouncing device arranged on the frame and a bouncing drive device used for driving the bouncing device. A pair of gliding devices and a gliding drive device for driving the gliding devices are also arranged on the frame; each gliding device comprises a front framework, a rear framework, a wing and a folding mechanism; the wings are fixed between the front framework and the rear framework; the front framework and the rear framework are connected with the folding mechanism; and the folding mechanism is connected with the gliding drive device for unfolding the wings. A take-off angle adjustment mechanism of the invention enables the robot to adjust take-off angles autonomously so as to adjust bouncing heights, bouncing distances and achieve stable landing; and therefore, the flexibility of actions of the robot is improved.

The invention discloses a cable joint connection structure comprising a first connection pipe and a second connection pipe. The gap between the first connecting pipe and the second connecting pipe isprovided with a sleeve. The side walls of the first connecting pipe and the second connecting pipe are fixedly connected with a fixing frame. The top of the fixing frame is fixedly connected with a mounting block. The mounting block is fixedly connected with the sleeve through a fixing bolt. The side wall of the sleeve is fixedly connected with an extrusion rod. One end of the extrusion rod far away from the sleeve is fixedly connected with an extrusion block. A moving frame is arranged inside the fixing frame, the extrusion block is slidably connected with the moving frame, and the bottom ofthe moving frame is fixedly connected with a moving rod. The invention relates to the technical field of cables. The cable joint connection structure achieves the purposes of stably clamping and reinforcing the cable, preventing the cable from falling off, effectively preventing the cable and the cable joint from loosening, greatly improving the safety of the cable joint and meeting the use requirements.

The invention discloses an overcurrent protection processing device. The device comprises a fixing box with a cavity. A fixing ring is welded to an inner wall of the fixing box, a rotary disc is rotatably connected to the inner wall of the fixing ring, a conductive block is embedded in the rotary disc, a sleeve is fixedly connected to a top wall of the fixing box, the sleeve is connected with a transmission structure, and the transmission structure includes a piston. A push ring is fixedly connected to a bottom of the piston, the bottom of the push ring penetrates through the inner wall of thesleeve, the push ring is in sealed sliding connection with the sleeve, a first magnet is fixedly connected to the bottom of the push ring, and a screw rod is rotatably connected to an outer wall of the sleeve through a bearing. The device has advantages that vaporization speeds of an evaporation liquid are different due to different magnitudes of a short-circuit current and an overload current during overcurrent; different adjustment of states of the two is realized in a system formed by a compression spring, a first magnet and a second magnet; and a self-recovery function and an effect are achieved.

The invention discloses a spring coil. The spring coil comprises an outer-layer ring assembly and an inner-layer ring assembly which both comprise a plurality of petaloid units. The spring coil has the advantages that as the spring coil is released from a conveying pipe, a base ring is formed by the spring coil at first, then an outer-layer ring is formed, after the outer-layer ring is completelyformed, the spring coil continues to be released to form the inner-layer ring assembly, and after the inner-layer ring assembly is completely formed, the spring coil is in a two-stage state of a complete flower shape or peach shape. The base ring and outer-layer ring of the spring coil can well adapt to the shape of aneurysm and form a buffer structure for the inner-layer ring assembly, and the formation of hernia is avoided; compared with the outer-layer ring, the inner-layer ring assembly has higher elastic potential energy, so that the spring coil in the two-stage state is unlikely to collapse and be twisted.

The invention discloses a high-speed repetitive pulse type radial flow trace gas supply valve which comprises a valve body, a driving part and an executing component. The driving part and the executing component are arranged on the valve body and used for controlling switching of the work states of a radial valve opening. The driving part comprises an induction driving coil and a pulse driving circuit, the induction driving coil is located on the valve opening and arranged opposite to a reed. The executing component is the reed in a flat truncated conical shell shape. The inner edge of the reed is fixed, and the outside of the reed can be deformed in the axial direction. Due to the fact that the mass of the reed is small, the valve can be fast opened under the action of the repelling force of induction vortex. Compared with a common flat plate type structure, when identical deformation is generated on the outer edge, elastic potential energy stored by the truncated-conical-shell-shaped structure of the reed is larger, and therefore quick closing can be achieved. The induction driving coil is designed to be of a flat truncated conical spiral structure and arranged opposite to the reed, and therefore the electromagnetic force density in the reed can be effectively improved. By means of the combination manner of the driving part and the executing component, the overall structural size and mass of the valve body are greatly reduced, and miniaturization and weight reduction of the structure are facilitated.

The invention discloses an intermittent drive non-abrasion hard sealed butterfly valve. The intermittent drive non-abrasion hard sealed butterfly valve is characterized in that the butterfly valve comprises a valve body, a movable valve seat, a valve rod, a lower valve rod sleeve, an upper valve rod sleeve, a butterfly plate and an intermittent driving device; the left side and the right side of the valve body are provided with flanges perpendicular to the axis of the valve body; the flanges are used for connecting the butterfly valve with a pipeline flange; the upper end and the lower end of the valve body are provided with an upper valve rod sleeve hole and a lower valve rod sleeve hole; a cavity of the valve body is a stepped hole; the upper valve rod sleeve and the lower valve rod sleeve penetrate into the valve body through the upper valve rod sleeve hole and the lower valve rod sleeve hole correspondingly; retainer cups are arranged between the upper valve rod sleeve and the valve body as well as between the lower valve rod sleeve and the valve body; the retainer cups are connected with the valve body through bolts, and adjusting gaskets are installed between the retainer cups and the valve body; both the upper end and the lower end of the same busbar of the upper valve rod sleeve are provided with flat key grooves, in addition, an upper cam is fixedly installed at the lower end of the upper valve rod sleeve through a flat key, and the upper end of the upper valve rod sleeve is connected with the intermittent driving device; the upper end of the lower valve rod sleeve is provided with a flat key groove, and a lower cam is fixedly installed at the upper end of the lower valve rod sleeve through a flat key; and a transferring shaft is installed between the upper cam and the lower cam.

The invention provides a suitcase handle. The suitcase handle comprises a handle and a handle seat, the two ends of the handle are both provided with a protruding column, the handle seat is provided with protruding column installation holes, the protruding columns are rotatingly arranged in the protruding column installation holes, both protruding columns are provided with a spring installation hole, both spring installation holes are provided with a spring, the ends, which are inserted into the spring installation holes, of the springs are provided with fixing rods, fixing mechanisms are arranged in the protruding columns of the handle, the fixing rods cooperate with the fixing mechanisms, the fixing rods of the springs are fixed in the spring installation holes of the protruding columns, the other ends of the springs are both provided with a moving rod, the moving rods abut the inner walls of the protruding column installation holes, the outer sides of the protruding columns are both provided with a limit block, the limit blocks correspond to the positions of the moving rods of the springs, and the limit blocks and the end face cooperated with the moving rods limit the moving rods to rotate in the direction of the end face. The springs of the suitcase handle are not easy to transform and fail, the installation is convenient, and the connection is firm.

The invention discloses an externally hung type energy-absorbing seat comprising a backrest frame, a seat, an unlocking mechanism and energy absorbing devices. The seat is mounted on the backrest frame in a mode that the height of the seat is adjustable. The unlocking mechanism is fixedly connected with the seat and is arranged on the backrest frame by sliding sleeves sleeved on the backrest frame. The upper ends of the energy absorbing devices are fixed on the backrest frame, and the lower ends of the energy absorbing devices are fixedly connected to the unlocking mechanism. Each energy absorbing device includes an inner tube, an outer tube, a steel strip and a pin. The outer tube is sleeved outside the inner tube, and the steel strip is provided with an elastic bending structure. The pins are respectively arranged on both sides of the elastic bending structure in an intersecting mode, and the ends of the pins are fixed on the inner tube. The both ends of the steel strip are fixed tothe upper and lower ends of the outer tube. The lower end of the inner tube is connected to the unlocking mechanism, and the upper end of the outer tube is fixedly connected to the backrest frame. According to the invention, with the above structural design, a better cushioning and shock-absorbing effect is achieved; higher comfort and safety degrees are reached; and irreversible damages to humanbodies are reduced.

The invention belongs to the technical field of metal plate machining devices, and particularly discloses a metal plate punching device. The device comprises a rack, a motor, an eccentric wheel, a puncher pin, a gear, a left transmission shaft, a right transmission shaft, a clutch, a worm wheel ,a worm, a sweeping device and a storing device; the sweeping device is fixed to the middle of the worm,and the sweeping device rotates along with the worm to sweep the working tabletop; the storing device is installed below a base, a solid waste box is placed under the storing device, the storing device works synchronous with the sweeping device through rotation of the worm, and generated waste swept by the sweeping device is collected and discharged into the solid waste box; due to sweeping workof the sweeping device, waste gathered at the working tabletop is removed in time, and it is ensured that the working environment is clean; waste is automatically cleaned day and collected, on-site cleaning work after production ending of production workers is avoided, and working pressure of production workers is relieved; under the effect of the storing device, cleaned waste can be effectively collected, and the purpose of environment-friendly production is achieved.

The invention discloses an undisturbed switching control method of a pneumatic regulation valve. The undisturbed switching control method of the pneumatic regulation valve relates to a device body anda first cavity formed in the device body. A first rotary shaft which extends upwards and downwards is rotatably arranged in the first cavity. The tail end of the top of the first rotary shaft is in power connection with a motor fixedly arranged in the top end wall of the first cavity. According to the undisturbed switching control method of the pneumatic regulation valve, the structure of a device is simple, the performance is reliable, and mounting, maintenance and repair are convenient; the device can automatically detect the rate of flow passing through the device and compares the flow rate with an initial setting, automatic dynamic regulation is conducted according to the flow rate, and thus, it is ensured that the rate of flow passing through the valve is constant; meanwhile, the device can be switched into a manual mode according to requirements, the flow data and the operating state of the device are not changed in the switching process, and thus, undisturbed switching betweenthe automatic mode and the manual mode is achieved; and in addition, the device can generate compressed gas through a micro gas pump, and an external gas source is not needed, so that the mounting procedure is greatly simplified, and the maintenance cost of the device is reduced.

The invention discloses an unloading device of an asphalt tank container. The unloading device structurally comprises the tank container, a balance frame, binning fixing holes, limiting steel bars, an exhaust pipe, a temperature measurement hole, a valve baffle, a baffle dowel pin, an opening fixing buckle, a closing fixing buckle, an operation panel, a thermometer, a heating pipe, a heater connecting flange, an unloading opening dustproof plug and a quick stopping plug valve; and the tank container is arranged inside the balance frame, the binning fixing holes are formed in the four ends of the balance frame, the binning fixing holes and the balance frame are of an integrated molding structure, and the limiting steel bar are arranged at the four corners of the front and back surfaces of the balance frame. The unloading device has the beneficial effects that the quick stopping plug valve is arranged, the unloading work can be paused quickly in a labor-saving manner through a quick stopping control key, the conditions that due to the fact that unloading cannot be paused in time, asphalt overflowing is caused, waste is caused, and the ground the polluted are avoided, and the operation flexibility, simplicity and convenience of the unloading device of the asphalt tank container are effectively improved.

The invention relates to a method for saving energy and attenuating vibration of an automated mechanical system having a motion-stoppage movement pattern. The method has the main characteristics of: picking up kinetic energy of inertial load of a decelerating section in the motion-stoppage movement pattern; storing the kinetic energy in an elastic potential energy way; and releasing the picked and stored elastic potential energy on starting and accelerating sections of the inertial load in the motion-stoppage movement pattern in a driving force or moment applying work way to carry out auxiliary drive to the inertial load so as to greatly reduce the maximum driving moment of the system and reduce energy consumption of the system. The method picks up the inertial kinetic energy of the decelerating section so as to reduce vibrational excitation of the system and further reduce vibratory response of the system. The method eliminates geometric closed gaps of an intermittent mechanism at a stoppage position so as to improve positioning accuracy of an intermittent motion mechanism. Therefore, the method has obvious effects of solving the problem of saving the energy and attenuating the vibration of the automated mechanical system having the motion-stoppage movement pattern, and improving the positioning accuracy.

The invention relates to a teaching device for simulating RLC oscillation circuit. The teaching device for simulating the RLC oscillation circuit comprises a torsion spring, a rotating assembly and anelectromagnetic induction assembly, the rotary assembly includes a limiting barrel, Energy-storage rotate wheel and force applying brace, the energy storage rotary wheel is rotatably arranged in thelimiting cylinder, the energy storage rotary wheel is connected with the torsion spring, the force applying brace is used for applying rotational motive force to the energy storage rotary wheel. The electromagnetic induction assembly includes a squirrel cage rotor and a magnetic body, the squirrel cage rotor interacting with the energy storage rotary wheel, the magnetic body disposed adjacent to the squirrel cage rotor for adjusting rotational resistance of the squirrel cage rotor. The electromagnetic induction assembly includes a squirrel cage rotor and a magnetic body, wherein the magnetic body is disposed adjacent the squirrel cage rotor for adjusting rotational resistance of the squirrel cage rotor. The teaching device of the analog RLC oscillation circuit is intuitive and convenient for teaching.

The invention belongs to the technical field of molds, and particularly relates to an automobile part injection mold. The automobile part injection mold comprises a mold shell, a mold core, an upper rod, reset coil springs, a rotating rod, a bearing, a circular groove, a lower rod, magnetic blocks, an anti-leakage shell, racks, a gear, a magnetic ring, a moving rod, a pull rod, a spring and a fixing rod. According to the automobile part injection mold, the lower rod is rotated, the lower rod rotates to drive the rotating rod to rotate around the bearing, and the rotating rod rotates to enablethe elastic potential energy of the reset coil springs to be increased; when one side of the lower rod is completely attached to one side of the upper rod, the upper rod and the lower rod are insertedinto the circular through groove, the lower rod is loosened, under the action of the elastic potential energy of the reset coil springs, the lower rod rotates to restore the original position, at themoment, the magnetic blocks are attached to the mold shell so as to complete the installation of the mold core; and the movable rod moves to drive the magnetic ring to move, the magnetic ring moves to be separated from the gear, the movable rod moves to compress the spring so that the spring is compressed to generate elastic force, the rack moves to drive the gear to rotate, then the pull rod isloosened, and under the action of the elastic force of the spring, the magnetic ring is restored to the original position so as to be attached to the gear.

The invention discloses a static test device for engineering pile detection. The static test device for engineering pile detection comprises a tray and an ejector rod. The top of the ejector rod is provided with a spherical support. The tray is connected to the spherical support. The static test device for engineering pile detection further comprises a supporting component which is located below the tray and used for buffering the tray. The supporting component comprises a supporting assembly and a buffering assembly. Due to the fact that the supporting component is arranged at the position ofthe tray, when balance weight pieces are stacked on the tray, the tray is impacted and shakes up and down or moves downwards, elastic potential energy of damping springs is improved after the dampingsprings are compressed, buffering is carried out on the tray, moreover, when the tray descends to the position where supporting blocks make contact with the top of a main plate, the main plate generates supporting force to support and buffer the tray, the loss and damage of the tray and the balance weight pieces are reduced, and the service life of the tray and the balance weight pieces is prolonged. When the balance weight pieces with a buffering function are used in cooperation with the tray provided with the supporting component, the buffering performance and effects are more prominent, the loss of equipment is reduced, and the service life of the test equipment is prolonged.

The invention relates to a piezoelectric-magnetic pressing facial cleansing instrument brush head which comprises a base, a shell, a plastic shell and a piezoelectric vibrator. The base is composed ofa base bottom plate, a brush seat and bristles; a base vibrator mounting platform is arranged on the upper end surface of the base bottom plate, and the lower end surface of the base bottom plate isconnected with the brush seat; the shell is of a hollow cylindrical shell structure with an opening bottom surface, and a fixed magnet is inlayed in the middle surface of the inner side surface of a cylindrical groove; a free-end mass block is arranged at one end of the piezoelectric vibrator, and the other end of the piezoelectric vibrator is installed in a vibrator installation groove; the samepolar and the position of the free-end magnetic mass block are opposite to the same polar and the position of the fixed magnet; and the plastic shell is bonded to the outside of the base and the outside of the shell, and a gap is reserved between the shell and the base. Magnetic coupling piezoelectric inertial drive is adopted, the piezoelectric-magnetic pressing facial cleansing instrument brushhead has the advantages of simple structure, high tolerance, high power density, less heat generation, no friction pair, no electromagnetic wave interference and the like, the service life is prolonged, especially after a magnetic coupling is used, and the energy converted into elastic potential energy is reduced, so that the energy conversion efficiency is improved.

The invention discloses an ejection device used for cold upsetting manufacturing. The ejection device comprises a work box. A cold upsetting rotator supporting rod penetrates through the top of the work box. The top of the work box is connected with a cold upsetting rotator through the cold upsetting rotator supporting rod. The cold upsetting rotator comprises a cold upsetting fixing groove located in the side surface of the cold upsetting rotator and the cold upsetting rotator supporting rod fixed to the bottom of the cold upsetting rotator, and the cold upsetting fixing groove is connected with the cold upsetting rotator supporting rod through the cold upsetting rotator. The cold upsetting fixing groove is formed in the side surface of the cold upsetting rotator, an ejection rod is arranged at the bottom of the cold upsetting rotator, an air cylinder is arranged at the bottom of the ejection rod, a buffer thread is arranged on the inner side of the air cylinder, a return quick draining valve and a pressure stabilizing valve are arranged on one side of the work box, a quick draining valve silencer is arranged at one end of the return quick draining valve, and a pressure stabilizing valve meter is fixed to the front face of the pressure stabilizing valve; and according to the ejection device, through the cold upsetting rotator, the buffer thread, telescopic rods, telescopic springs and the like, the purposes that the protection effect of the device is improved and the device is convenient to dismount and mount are achieved.

The invention discloses an automatic reversing mechanism, and belongs to the technical field of oil cylinder control devices. The automatic reversing mechanism solves the technical problem and achieves automatic reversing through the motion of piston rods of oil cylinders. According to the technical scheme for solving the technical problem, the automatic reversing mechanism comprises the first oil cylinder, the second oil cylinder, the third oil cylinder, the first piston rod, the second piston rod, the third piston rod and a manual reversing valve, a cylinder body of the first oil cylinder, a cylinder body of the second oil cylinder and a cylinder body of the third oil cylinder are all fixedly arranged, the second oil cylinder is arranged between the first oil cylinder and the third oil cylinder, the bottom end of the manual reversing valve is fixed, the manual reversing valve is a two-position four-way valve, and the manual reversing valve controls the motion direction of a second piston. The automatic control over the automatic reversing mechanism is achieved through the motion of the piston rods of the oil cylinders, and the explosion-proof security of equipment used under a mine is increased.

The invention relates to the technical field of permanent magnet cranes and discloses a self-adaptive stable permanent magnet crane. The self-adaptive stable permanent magnet crane comprises a crane body and a pull rope; the pull rope is fixedly connected to the crane body; a stabilizing mechanism is arranged at the lower end of the pull rope; a permanent magnet adsorption mechanism is arranged at the lower end of the stabilizing mechanism; auxiliary mechanisms are arranged at the lower end of the permanent magnet adsorption mechanism; the permanent magnet adsorption mechanism comprises a permanent magnet jack and reset springs; inclined grooves are formed in the lower end of the permanent magnet jack; clamping grooves are formed in the lower ends of the left side and the right side of the permanent magnet jack; and the stabilizing mechanism comprises a fixed sleeve, inclined plates, inclined sleeves, stretching rods, extrusion springs, telescopic rods, sliding plates and a clamping hook. The self-adaptive stable permanent magnet crane has the function of pushing and cleaning scrap iron between an iron plate and the permanent magnet lifting jack, so that the gap between the permanent magnet lifting jack and the iron plate is reduced, the possibility that a sucked object falls off due to interference of the scrap iron is prevented, and in addition, the permanent magnet adsorption mechanism is kept relatively balanced and stable through the stabilizing mechanism.

The invention discloses a cold compress device for nursing in a gynaecology and obstetrics department. The cold compress device comprises a bottom plate, wherein a fixing rack is fixedly connected with the top of the bottom plate; a rotating disc is arranged outside the fixing rack; a handle is arranged on the surface of the rotating disc; a rotating screw rod is fixedly connected with the axis center of the rotating disc; the rotating screw rod is rotationally connected with the fixing rack; the rotating screw rod is in threaded connection with a moving plate; a guide rod is fixedly connectedwith the side wall of the moving plate; the guide rod is in sliding connection with the fixing rack; and a support rod is fixed at the tail end of the guide rod. The invention relates to the technical field of medical instruments. By adopting the cold compress device for nursing in the gynaecology and obstetrics department, a towel can be fixed by using the moving rack, manual fixation can be replaced, the labor can be saved, and convenience in use can be achieved; and in addition, the airbag is matched with hook and loop fasteners to fix the towel, so that the towel can be in tight contact with a private part, the cold compress effect can be improved, and the purpose of use demands can be met.

The invention discloses a gas one-way valve. The gas one-way valve comprises a valve body, a valve element, an elastic adjusting part and an elastic part, the valve body comprises a valve main body, the valve main body is provided with a mounting part and an air guide part, the mounting part is provided with a mounting channel and a mounting opening communicating with the mounting channel, an airguide channel is formed in the air guide part, an air guide port is formed in the air guide channel, the air guide channel is in abut joint with an air storage tank, the section diameter of the mounting channel is larger than that of the air guide channel, the air guide part and the mounting part form a step between the mounting channel and the air guide channel, the valve element is clamped to the step in a seal manner through the mounting opening, the elastic adjusting part forms a ventilation window, the elastic adjusting part is mounted in the air guide channel, the elastic part is mountedin the mounting channel in a compressed manner in a manner that one end of the elastic part is pressed against the valve element, and the other end of the elastic part is pressed against an elastic pressing-against part, the valve element is pressed on the step, and the air guide channel and the mounting channel are obstructed.

The invention discloses a power battery structure with automatic pressure relief. The structure includes a battery cover plate and an automatic pressure relief valve, wherein the battery cover plate includes a positive end portion and a negative end portion, a pressure relief port is arranged between the positive end portion and the negative end portion, the automatic pressure relief valve is mounted in the pressure relief port and includes a fixing sleeve, an elastic member and a moving plug body, the fixing sleeve has a pressure relief chamber, the fixing sleeve includes an exhaust port andan air inlet, the pressure relief chamber is in communication with the exhaust port and the air inlet, the moving plug body has a plug, the plug is movably plugged in the air inlet, the moving plug body is disposed in the pressure relief chamber, the elastic member is sleeved on the moving plug body, the elastic member is driven through movement of the moving plug body to change the potential energy of the elastic member, and connection state switching of the plug and the air inlet is achieved through potential energy transition between the moving plug body and the sleeved elastic member. Thestructure is advantaged in that the structure is simple, compact to match, is convenient to use and is reasonable to design, so the structure has excellent technical and economic properties.

The invention discloses a vehicle upper swing arm assembly. The vehicle upper swing arm assembly comprises a swing arm body; the swing arm body comprises two arm bodies connected by one ends in a herringbone form, and a spherical pin; the spherical pin comprises a bulb, a bulb base and a bulb rod; circular through holes are formed in the other ends of the arm bodies; bushings are arranged in the circular through holes; special-shaped shafts capable of rotating in the bushings are arranged in the bushings; the bulb base comprises a bulb outer base, a sealing plate and a bulb butting base; an annular support piece is inwards formed in the end part of a lower opening of the bulb outer base; the sealing plate is provided with an annular butting piece matched with the annular support piece; the bulb butting base is provided with an elastic curve part bonded with a bulb spherical surface; a through hole is formed in the center of the elastic curve part; the special-shaped parts comprise set bushing inner sections and bushing inner sections; the bushing sections form projections; each arm body is provided with a reinforcing block upwards projected; and the reinforcing blocks are connected. The vehicle upper swing arm assembly is excellent in support effect and load transfer, and achieves excellent buffer on impulsive force and vibration amplitude among all vehicle parts.

The invention relates to the technical field of structural floors, and discloses a fabricated combined structural floor convenient to mount. The floor includes a solid board, a damp proof and heat resistance layer is connected with the bottom of the solid board in a lapping mode, a sub-keel is connected with the bottom of the damp proof and heat resistance layer in a lapping mode, an air feeding core board is arranged in the middle of the sub-keel, an elastic cushioning pad is connected with the bottom of the sub-keel in a lapping mode, a main bearing rod is arranged at the bottom of the elastic cushioning pad, and a cushioning spring is connected in the main bearing rod in a moving mode. According to the fabricated combined structural floor convenient to mount, through the arrangement ofthe damp proof and heat resistance layer, a floor is prone to generate a great deal of damp gas in rainy damp weather, the damage such as bubble hair gel to the floor is prone to be caused due to thefact that the damp gas erodes the floor for a long time, the damp proof and heat resistance layer can block a great deal of damp gas, the floor can be protected, and when the bottom of the floor is embedded with equipment such as radiant floor heating equipment, the damp proof and heat resistance layer can protect the floor so that the cracking due to the fact that the floor is not evenly heated can be prevented.

The invention discloses an automobile side skirt capable of being automatically opened and closed, which belongs to the technical field of automobiles and comprises a side skirt body and a transmission device, wherein the side skirt body comprises a fixing plate connected with the lower edge beam, a fender and a dust shielding box, wherein the fender and the dust shielding box are rotationally connected to the fixing plate through rotating shafts; and a linkage device is rotationally connected to the fixing plate and comprises a first connecting plate and a second connecting plate, one side of the first connecting plate is movably connected with the dust shielding box, and one side of the second connecting plate is rotationally connected with the inner wall of the dust shielding box. The invention further discloses a high-end welcome automobile. The high-end welcome automobile comprises an automobile body, an automobile door rotationally connected to the automobile body and an automobile side skirt fixedly arranged on a lower edge beam of the automobile body. The automobile side skirt can be stored in the dust shielding box, cannot be exposed for a long time, can be kept clean for a long time, prevents trouser legs from being stained when a driver gets on or gets off a vehicle, can improve the experience feeling of a high-end vehicle, enables the driver to experience VIP-level treatment, and is convenient to use, low in manufacturing cost and suitable for manufacturing side skirts of all vehicles.

The invention discloses a cross bow which comprises a shell, an arrow channel for containing an arrow is arranged on the shell, and the cross bow comprises at least one bow arm; the bow arm comprises a fixed end and a movable end; the movable end moves towards the fixed end due to pressure, and two convex parts in opposite directions are formed on the bow arm, so that the bow arm is in a wave shape; the bow arm restores deformation through reverse movement of the movable end; and a main chord of the cross bow is directly or indirectly connected with the movable end of the bow arm. The bow arm can generate large elastic potential energy, and kinetic energy consumed by transverse movement of the bow arm can be reduced; and the problem that the strokes of a plurality of bow arms are different is solved. The phenomenon that kinetic energy is consumed due to transverse movement of a reel is avoided, and more kinetic energy can be obtained by the arrow. By means of a string winding mode, a pre-pressing structure, a pre-tightening wheel and other structures, only the acting force of an elastic component can be overcome in the string winding process, deformation of the bow arm does not need to be overcome, the string winding process is quite easy and saves labor, and it is not needed to worry that due to insufficient tension, the bow arm rebounds to accidentally injure the human body.