83results about How to "Avoid strong impact" patented technology

The invention provides a defrosting control method for the air conditioner. The defrosting control method for the air conditioner comprises a frequency reducing step: reducing the running frequency of a compressor of the air conditioner when the air conditioner is in a heating mode if the condition that defrosting is needed is detected; a detection step: performing real-time detection on a current waveform state when the compressor runs; a frequency determining step: determining target frequency when the compressor quits low-frequency torque compensation according to the current waveform state; a defrosting step: switching the heating mode into a defrosting mode when the running frequency of the compressor is equal to the target frequency, and boosting the running frequency of the compressor so as to start defrosting. Correspondingly, the invention also provides a defrosting control system of the air conditioner and the air conditioner. Through the technical scheme adopted by the invention, the compressor may not be stopped during defrosting, and the heating effect is improved, so that the reliability of the air conditioner is improved, and the user experience is promoted.

The invention discloses a silicon wafer cleaning and drying integrated device, which comprises a movable frame. A control cabinet, a cylinder, a lifting device, an automatic cover plate and a cleaningtank are arranged in the movable frame. The lifting device is arranged in a box body, a bracket for placing a silicon wafer carrying basket is disposed on one side of the box body, and the lifting device comprises a driving motor, a screw rod, a connecting rod and a connecting sleeve. The driving motor is disposed at the bottom surface of the box body. The driving motor drives the screw rod to rotate through a gear. A limiting slot is arranged at the lower part of the screw rod. The limiting slot is internally provided with a limiting block matched with the limiting slot. The silicon wafer cleaning and drying integrated device can realize the continuous up-down movement of the silicon wafer to be cleaned in the cleaning tank, improve the cleaning quality and the cleaning efficiency of thesilicon wafer; and nitrogen is introduced into an inner tank through a bubbling mouth to increase the fluidity and the turbulence of the cleaning liquid in the inner tank, and to enhance the cleaningeffect and drying effect of the cleaning solution on the surface of the silicon wafer.

The invention discloses a simple heavy stuff carrying and feeding trolley and belongs to the field of carrying tools. The simple heavy stuff carrying and feeding trolley comprises a base, universal casters, a support, a feeding support, a sliding support, a supporting device, a manual winch, a pulley set and a hoisting hook, wherein the universal casters are arranged on the base, the support and the base are fixed into a whole, the feeding support is arranged on the top of the support, the sliding support is arranged inside the feeding support, the supporting device is arranged in the front of the feeding support, the manual winch is fixed to the back portion of the sliding support, and the pulley set and the hoisting hook are installed in the front of the sliding support. The pulley set comprises a fixed pulley and a movable pulley, a steel wire rope is led from the manual winch, sequentially winds around the fixed pulley and the movable pulley and then is fixed to the sliding support or a fixed pulley support; a fixed supporting plate is installed at the back of the base, and a movable supporting plate is installed in the front of the base. According to the simple heavy stuff carrying and feeding trolley, the functions of heavy stuff hoisting, transferring and machine tool feeding are achieved through a simple structure, and the labor intensity of workers is alleviated; meanwhile, the simple heavy stuff carrying and feeding trolley is simple in structure, convenient to operate, low in cost and high in safety and meets the use requirements of small and medium size enterprises.

The invention provides a compact, lightweight and low-cost operating apparatus for a switchgear. A second cam (50) turned counterclockwise by an electric motor begins to maintain contact with a closing lever (37) at a first angular position (POS1), turns the closing lever (37) counterclockwise to energize a circuit-making coil spring (77), and causes a closing latch (48) to lock the closing lever (37). The second cam (50) further turning counterclockwise becomes separated from the closing lever (37) and actuates a cam switch (156) at a second angular position (POS2) to interrupt an electric current supplied to the electric motor. The second cam (50) further turns due to inertial turning of the electric motor and is braked by a elastic brake member (159) at a third angular position (POS3), whereby the second cam (50) stops within a specific angular range DELTAtheta of rotation. Despite its simple structure, the elastic brake member (159) can halt the second cam (50) in a reliable fashion.

The invention relates to a mechanical buffering and limiting device. The mechanical buffering and limiting device comprises a pitch shafting rotary shaft, a stand column supporting the rotary shaft, a bidirectional collision block, single-end spring buffering pieces and double-end spring buffering pieces, wherein the bidirectional collision block is fixedly connected with the pitch shafting rotary shaft through a screw, the two single-end spring buffering pieces and the two double-end spring buffering pieces are installed on the end face of the stand column supporting a pitch shafting according to the positions of limiting angles, and at the positions of the two limiting angles, one end of the bidirectional collision block is made to strike one single-head spring buffering piece, the other end of the bidirectional collision block is made to strike the double-end spring buffering piece which is arranged on the stand column supporting the rotary shaft, the included angle between the single-end spring buffering piece stricken by one end of the bidirectional collision block and the double-end spring buffering piece stricken by the other end of the bidirectional collision block is 180 degrees in the circumferential direction, and thus a moment of couple is formed to buffer the rotation of the pitch shafting rotary shaft. The mechanical buffering and limiting device is suitable for safety protection of the rotary pitch shafting of a photoelectric theodolite. According to the mechanical buffering and limiting device, the rotation of the rotary shaft is prevented through the moment of couple, impact to the pitch shafting is avoided, and the rotation precision of the pitch shafting is guaranteed.

The invention discloses a workpiece conveying manipulator used for forging mechanical automatic equipment in the technical field of forging mechanical automatic equipment. The workpiece conveying manipulator comprises a frame, a linear motor, a horizontal linear guide way, a manipulator and a take-up hand, wherein, the manipulator is arranged on the upper surface of the frame; the linear guide way is connected with the frame in a sliding way through the horizontal linear guide way; the linear motor is arranged between the manipulator and the frame so as to drive the manipulator to reciprocate along the horizontal linear guide way; and the take-up hand is connected on the manipulator. The workpiece conveying manipulator has the advantages of simple driving structure and high driving efficiency, and is applicable to burden high-speed occasions.

The invention relates to a hot tapping blockage pressure balancing device of a fluid pipeline and a method of the hot tapping blockage pressure balancing device. The balancing device comprises a connection pipe fitting, a tapping machine, an auxiliary connection pipe fitting, an auxiliary tapping machine and a gas storage tank, wherein a cavity of the connection pipe fitting is a tapping connecting box; the tapping machine and a sandwich valve are arranged in the tapping connecting box; when the sandwich valve is closed, the tapping connecting box is divided into two parts by the sandwich valve; when the sandwich valve is opened, the two parts of the tapping connecting box communicate with each other to form a whole body; a cavity of the auxiliary connection pipe fitting is an auxiliary tapping connecting box; the auxiliary tapping machine and an auxiliary sandwich valve are arranged in the auxiliary tapping connecting box; when the auxiliary sandwich valve is closed, the auxiliary tapping connecting box is divided into two parts by the auxiliary sandwich valve; when the auxiliary sandwich valve is opened, the two parts of the auxiliary tapping connecting box communicate with each other to form a whole body; and the tapping connecting box and the auxiliary tapping connecting box are connected with the gas storage tank through pipes respectively. By the balancing device and the method for tapping a high-pressure gas delivery pipe, severe shock of high pressure in a high-pressure gas pipe to a perforating machine is avoided, so that production safety and safety of operators are ensured.

The invention discloses an integrated selection valve capable of being connected and matched with a drive device. The selection valve comprises a valve body, a piston capable of moving in the valve body and a reset piece. The valve body is provided with an air inlet and an air outlet. The piston is connected in the valve body in a sealing manner. A first space is formed between the upper portion of the piston and the inner wall of the valve body. The air inlet communicates with the first space. The valve body is provided with a first channel communicating with the first space and the drive device. A second space is formed between the lower portion of the piston and the inner wall of the valve body. The valve body is provided with a second channel communicating with the second space and the drive device. A third space is further formed between the bottom of the piston and the valve body and internally provided with a buffering structure capable of buffering the piston when the piston moves along the valve body. The integrated selection valve is small in opening force and good in sealing performance, action tests of 500 times can be achieved, the assembled structure is simple, and the service life is long.

The present invention relates to a safety device for preventing a nailer from dry firing, wherein an elongated hole is formed on the magazine, the safety link is provided with a folded projection in response to the elongated hole, a safety nut is pivotally disposed in the elongated hole. The magazine is provided with an elastic element for keeping the safety nut flush with the edge of the elongated hole. After the last nail is shot (when no nails are loaded), the safety nut will be pushed out of the elongated hole by the drive plate so as to prevent the nailer from being fired. Thus, the user's strength and energy are saved, meanwhile, the service life of the nailer is prolonged.

The invention discloses a medicated bath capable of maintaining beauty and keeping young and a health care instrument with the function of traditional Chinese medicine fumigation. The medicated bath capable of maintaining beauty and keeping young and a health care instrument with the function of traditional Chinese medicine fumigation comprises a shell with an opened upper portion, and an inner shell with an opened upper portion. The inner shell is arranged in the interior of the shell in a sleeving mode. The bottom and the side wall of the inner shell are provided with multiple through holes such that the inner shell is in fluid connection with internal space of the shell. An interval of 8-15 cm is arranged between the side wall of the inner shell and the side wall of the shell such that the inner shell has space independently shaking relative to the shell. The side wall of the inner shell runs parallel to the side wall of the shell. An elastic first sealing ring is arranged between the side wall of the inner shell and the side wall of the shell and used for enclosing a gap between the side wall of the inner shell and the shell. In addition, the bottom of the inner shell is connected with the bottom of the shell by a liftable rotary shaft and used for supporting the inner shell. A first end of the rotary shaft is fixedly connected with the bottom of the shell. A second end of the rotary shaft is movably connected with the bottom of the inner shell by means of a fixing part in the manner of freely swinging the inner shell.

The invention relates to the technical field of petroleum geology drilling tool, in particular to a well drilling accelerating mechanism. The technical problems that an existing drill bit driving drill does not have the drilling pressure extension capacity, and the drill bit rock breaking capacity cannot be improved are solved. The well drilling accelerating mechanism comprises a circumferential buffer accumulator, an axial buffer accumulator and a connecting assembly; one end of a torsional spring component is connected with a connecting component, and the other end of the torsional spring component is connected with a drilling tool output shaft or a power component; the axial buffer accumulator comprises a guide spindle and a disc spring component; the guide spindle is installed on the drilling tool output shaft or the power component; the disc spring component is installed on an outer circle of the guide spindle. Accordingly, the instantaneous rotational speed of a drill bit can beadjusted, the rock breaking efficiency of the drill bit is improved, the working life of the drill bit is prolonged, the effective action distance of drill pressure can be extended, the effective working time of the drilling tool can be prolonged, a torque fluctuation peak value of the drilling tool is reduced, the drilling speed is increased, and the drilling quality is improved.

The invention belongs to the technical field of wave vibration power generation devices, and particularly relates to a wave energy conversion device. The wave energy conversion device comprises a transmission swing rod, a fixed seat, a transmission mechanism and an energy collection mechanism, wherein the transmission mechanism and the energy collection mechanism are mounted on the fixed seat; theenergy collection mechanism comprises a magnetostrictive sheet, an induction coil, permanent magnets and a magnetic conductive shell, the induction coil is wound on the magnetostrictive sheet, and the permanent magnets are arranged on both sides of the induction coil and are fixed in the magnetic conductive shell; and the transmission mechanism comprises a transmission shaft, an excitation shaftand an excitation swing rod, the excitation swing rod is fixed on the excitation shaft, a transmission swing rod is fixed on the transmission shaft, and the transmission shaft is rotationally matchedwith the excitation shaft through gears. When waves drive the transmission swing rod to swing, the transmission swing rod drives the transmission shaft to move, the excitation shaft rotates in linkageto cause the excitation swing rod to press the magnetostrictive sheet, the magnetostrictive sheet is caused to generate strain, under the action of the magnetic field, stress changes causes changes in magnetic induction intensity, and the induction coil generates an electric potential to realize energy conversion.

The invention discloses a simple heavy object carrier belonging to the field of carrying tools. The simple heavy object carrier comprises a base, universal trundles arranged on four bottom legs of the base, a bracket fixed together with the base to form a whole body, a sliding bracket which is arranged at the top of the bracket and is capable of sliding forwards and backwards on the bracket, a manual winch fixed to the rear part of the sliding bracket, a pulley block mounted on the front part of the sliding bracket and a lifting hook, wherein the pulley block comprises a fixed pulley and a movable pulley; a steel wire rope is led out of the manual winch, sequentially bypasses the fixed pulley and the movable pulley and then is fixed on the sliding bracket or a fixed pulley bracket; the lifting hook is connected with the movable pulley; a fixed support plate is mounted on the rear part of the base; a movable support plate is mounted on the front part of the base; and the movable support plate is articulated with the fixed support plate. By utilizing a simple structure, the double functions of lifting and transporting the heavy objects are realized; the labor intensity of workers is alleviated; meanwhile, the simple heavy object carrier is simple in structure, convenient to operate and low in cost; the use requirements of small and medium-sized enterprises can be met.

The invention discloses a business request processing method and system and electronic equipment, and the method comprises: monitoring the business volume information of a first service node, and judging whether the business volume information meets a preset business transfer condition or not; and if so, sending a service transfer instruction to the first service node, so that the first service node transfers the to-be-transferred service request to the second service node according to the received service transfer instruction. According to the method, the business volume information of the first service node is monitored, and when the business volume information meets the business transfer condition, some business volume requests of the first service node are transferred to the second service node for processing, so the amount of service requests needing to be processed by the first service node is reduced; and the effect of controlling the bandwidth of the first service node is achieved by distributing services, strong impact of suddenly increased service requests on the first service node can be avoided, and then it is guaranteed that the first service node can normally provideservices all the time.

The invention relates to the technical field of waterproof devices, in particular to a cellphone protecting box for swimming, which protects against water by the sealing fit of an upper casing and a lower casing. A water-absorbing sponge is installed in the casings; the water-absorbing sponge can absorb water drops which probably exist in the casings, and can also prevent the cellphone and the casings from violent impact during swimming; the outer side of the upper casing or lower casing is provided with two snap rings, and the two snap rings are connected by a rubber belt; and the entire casing is bonded to the hand by the rubber belt, so the cellphone can be taken along at any time, and the user can answer the phone to avoid missing important calls, therefore, the cellphone protecting box for swimming has strong practicality and favorable market prospects.

The invention provides an automatic mold opening / clamping machine which comprises a movable mold fixing plate and a fixed mold fixing plate which are arranged on the left and right sides of a mold supporting platform and are used for providing suction molds, wherein a movable mold electromagnetic chuck is arranged on the movable mold fixing plate; a fixed mold electromagnetic chuck is arranged on the fixed mold fixing plate; and the automatic mold opening / clamping machine also comprises a power mechanism used for controlling the opening / closing action of the movable mold fixing plate and an electrical control cabinet used for performing master control on the action of each part of the automatic mold opening / clamping machine. According to the automatic mold opening / clamping machine disclosed by the invention, the mold is automatically clamped, the opening / closing efficiency is high, the mold clamping precision is high, the damage of the mold caused by knocking is avoided, and the machine has extremely high durability and reliability.

The invention discloses an impact-resistance vacuum interface valve. The valve comprises a valve body and a piston diaphragm arranged in the valve body, a first inlet and a first outlet are formed inthe valve body, and the valve is characterized in that the piston diaphragm forms a damping cavity. The vacuum interface valve further comprises a damping system and a vacuum driving system, the damping system comprises damping liquid, a damping liquid chamber, a first one-way valve and a second one-way valve, a driving diaphragm is arranged in the vacuum driving system, the driving diaphragm is fixedly connected with the piston diaphragm through a connecting rod, the damping cavity is filled with the damping liquid, the piston diaphragm in the vacuum interface valve has the impact resistance,the service life of the piston diaphragm can be prolonged, and the reliability of the interface valve can be prolonged.

The invention belongs to the field of powder metallurgy, and relates to a screening device for pure high-temperature alloy powder. The screening device comprises four parts: a screening system, a vacuum system, an inflation system and an electromagnetic feeding system, wherein the vacuum system is connected with the top part of the screening system through a pipeline; the inflation system is arranged on the lower part of the screening system; the electromagnetic feeding system is arranged on the top part of the screening system and comprises an electromagnetic vibrator and a horizontal pipeline; one end of the horizontal pipeline is connected with the top part of the screening system; the other end of the horizontal pipeline is connected with one powder tank; three powder tanks are locatedon the upper part of the electromagnetic feeding system, the lower part of a screen of the screening system, and the upper part of the screen of the screening system; and various connecting parts ofthe screening device are sealed through O-shaped seal rings. In order to solve the problems that the requirement on the screening purity of gas atomization high temperature alloy powder is high and the like, the oxygen content and the water content of high-temperature alloy powder are reduced through the system integration screening device, and the powder quality of the high-temperature alloy after screening is improved.

The invention provides a control method and device for a continuous variable valve lift mechanism. According to the control method and device, it can be avoided that a limiting face of the mechanism fiercely impacts on a mechanical dead point, and therefore abrasion of parts of the mechanism is reduced, the control precision of the mechanism is ensured, and the sound quality of an engine is improved. The method includes the steps that whether a valve reaches the first lift or the second lift is confirmed, wherein the first lift is the lift which is the difference between the maximum lift of the valve and a first preset value, and the second lift is the lift which is the difference between the minimum lift of the valve and a second preset value; and if it is confirmed that the air valve reaches the first lift or the second lift, the first rotating speed of a drive motor of the continuous variable valve lift mechanism is obtained and adjusted to be the second rotating speed, wherein the second rotating speed is smaller than the first rotating speed. The control method and device are suitable for the technical field of control.

A disclosed protective film for a screen comprises a protective film body and a frame body, the protective film body is connected to the frame body, positioning assemblies are arranged at the four corners of the protective film body correspondingly, the four positioning assemblies are matched with the four corners of the protective film body correspondingly, the four positioning assemblies are arranged on the frame body correspondingly, and the four corners of the frame body are fixedly wrapped with clamping mechanisms correspondingly. According to the protective film for the screen, a dampinglayer, multiple buffer blocks and multiple buffer grooves are used for achieving a certain buffer effect on the film body, the edge of the film body is prevented from being damaged due to strong extrusion, the protective film does not need to be bonded to the display screen in the later period, installation is more convenient, meanwhile, the frame body can extrude the protective film, thus the connection between the protective film and the display screen is tighter, the protective film is prevented from loosening, the use effect of the protective film is ensured, and the protective film is more convenient to install.

The invention provides a two-side intake bladeless fan. The two-side intake bladeless fan comprises a shell (1), and a volute part (2) and an exhaust part (3) arranged in the shell (1); the exhaust part (3) is an annular structure form; the volute part (2) comprises a first intake port (21) formed in one side, and a second intake port (22) formed in the other side opposite to the side; and an exhaust port (31) is formed in the exhaust part (3). The two-side intake bladeless fan is higher in air volume output and air amplifying times and more uniform in exhausting, prevents powerful impact on persons by a conventional fan, enables the persons to feel comfortable through exhausting, is suitable for cooldown of old people and children, is tireless after long-time blowing, and is safe and reliable.

The invention discloses a water hammer-resistant constant-pressure pressure reducing valve, characterized in that the water hammer-resistant constant-pressure pressure reducing valve is provided with a valve body 1 and a valve body 2 connected with the valve body 1 as a whole. Valve cores are respectively arranged in the inner cavities of the two valve bodies; the valve 1 is a step cylinder with an inner step hole; a valve seat sleeve is screwed in the water inlet at the upstream end; cylinder barrels are respectively arranged in the inner holes at the upstream side and the middle section of the valve body 2; the inner holes at the downstream side are water outlets; the valve core is a sleeve drilled with blind holes at the centre; a piston with the larger diameter is arranged in the middle of the sleeve; a plunger is arranged on the downstream end; the upstream end is provided with a valve clack; the external circle of the sleeve glidingly coordinates with the centre hole corresponding to the valve body 1; the external circle of the middle piston glidingly coordinates with the cylinder barrel at the upstream side of the valve body 2; the outer diameter of the plunger at the downstream end of the sleeve coordinates with the inside diameter of the cylinder barrel at the middle section of the valve body 2 at interval; and a spring is arranged between the middle piston and the valve body 1. The pressure reducing valve does no have a pressure regulating structure, so the pressure reducing valve has simple structure and is maintained conveniently; meanwhile, a damping structure is arranged at the downstream side of the pressure reducing valve so as to effectively control the moving speed of the valve core and prevent the pressure reducing valve damaging when the water hammers occur.

The invention discloses a silicon wafer cleaning and drying integrated device, which comprises a movable frame. A control cabinet, a cylinder, a lifting device, an automatic cover plate and a cleaningtank are arranged in the movable frame. The lifting device is arranged in a box body, a bracket for placing a silicon wafer carrying basket is disposed on one side of the box body, and the lifting device comprises a driving motor, a screw rod, a connecting rod and a connecting sleeve. The driving motor is disposed at the bottom surface of the box body. The driving motor drives the screw rod to rotate through a gear. A limiting slot is arranged at the lower part of the screw rod. The limiting slot is internally provided with a limiting block matched with the limiting slot. The silicon wafer cleaning and drying integrated device can realize the continuous up-down movement of the silicon wafer to be cleaned in the cleaning tank, improve the cleaning quality and the cleaning efficiency of thesilicon wafer; and nitrogen is introduced into an inner tank through a bubbling mouth to increase the fluidity and the turbulence of the cleaning liquid in the inner tank, and to enhance the cleaningeffect and drying effect of the cleaning solution on the surface of the silicon wafer.

The invention discloses an automatic grinding device for dangerous article analysis. The automatic grinding device for dangerous article analysis solves the problem of grinding treatment of dangerousarticles. The automatic grinding device for dangerous article analysis is composed of a base (1), a grinding hammer drive device support (2), a grinding hammer drive device (3), an air cylinder hinge(4), an air cylinder (5), a grinding hammer (6), a grinding mortar (7), a grinding mortar drive device (8), a grinding mortar drive device base (9) and an air cylinder fixing hinge (10). The grindinghammer drive device support (2) is fixed to the base (1). The grinding hammer drive device (3) is connected with the grinding hammer drive device support (2) and the air cylinder hinge (4). The grinding hammer (6) is connected with an output shaft of the grinding hammer drive device (3). The grinding mortar drive device (8) is connected with the grinding mortar drive device base (9). The grindingmortar (7) is connected with the grinding mortar drive device (8). One end of the air cylinder (5) is connected with the air cylinder fixing hinge (10). One end of the air cylinder (5) is connected with the air cylinder hinge (4).

The invention relates to the field of chains, in particular to a variable-pitch large-load chain which comprises two symmetrically-arranged outer chain plates. Four inner chain plates are symmetrically and movably connected between the two outer chain plates; the four inner chain plates are divided into two sets, and each set is composed of two symmetrically-arranged inner chain plates; two limiting shafts are symmetrically and fixedly mounted on the outer side wall of each of the four inner chain plates; the ends, away from the correspondingly arranged inner chain plates, of the multiple limiting shafts are inserted into the outer chain plates arranged in a matched manner; two buffer mechanisms are symmetrically and movably mounted on each of the two outer chain plates; and the two ends,away from each other, of the four buffer mechanisms are inserted into the inner chain plates arranged in a matched manner; two pin shafts are rotationally installed between every two inner chain plates which are arranged in the same set; and the four pin shafts are each rotationally sleeved with a roller, and a center shaft is arranged in each of the four pin shafts. According to the variable-pitch large-load chain, the distance between the rollers can be adjusted, then the chain pitch can be changed, the chain can be connected to chain wheels of different specifications in a sleeving mode, and the application range of the chain is greatly widened.

The invention relates to a hammering tool. The hammering tool comprises a shell, a chuck, an impact mechanism and a driving mechanism, wherein the chuck is arranged at the front end of the shell and is used for accommodating a working head; the impact mechanism comprises an air cylinder arranged in the shell, a piston accommodated in the air cylinder, a rammer matched with the piston and an impact rod capable of transmitting the impact force of the rammer to the working head; and the driving mechanism is accommodated in the shell and used for driving the piston to reciprocate between a first position far away from the chuck and a second position close to the chuck in the axial length direction of the air cylinder. An air chamber is formed between the piston and the rammer, and the rammer can reciprocate between an initial position and a tail end position under the driving force of the air chamber so as to drive the rammer to hammer the working head. A pressure adjusting air hole communicating with the inside and the outside of the air cylinder is formed in the side wall of the air cylinder, the pressure adjusting air hole is formed between the second position of the piston and the initial position of the rammer, when the rammer reciprocates between the initial position and the tail end position, at least part of air in the air chamber is exhausted out of the air cylinder through the pressure adjusting air hole, and the structure is simple, rapid and convenient.

The invention discloses an electronic equipment screen protection unit. The electronic equipment screen protection unit comprises a first shell and a second shell, wherein the second shell is fixed in the first shell, the gap between the inner wall of the first shell and the outer wall of the second shell forms a first default zone, an air generator, a control switch, an acceleration sensor and an airbag are arranged in the first default zone, the air generator is connected with the airbag through an air pipe and also connected with the control switch, the control switch is connected with the acceleration sensor, and an upper end cover and a lower end cover are arranged in the first default zone. The unit is reasonable in design and can protect a screen when electronic equipment falls off so as to avoid breaking.

The invention discloses a shed tunnel structure capable of effectively resisting impact of falling rock. The shed tunnel structure comprises: a shed tunnel top plate, wherein a top plate frame is fixedly arranged on the peripheral side of the upper surface of the shed tunnel top plate; a protective net, which is arranged above the top plate of the shed tunnel at certain intervals and is formed by arranging a plurality of hinged ropes in a crossed mode; a plurality of elastic energy dissipation assemblies, wherein each elastic energy dissipation assembly comprises a spring fixedly connected to the rope end of the hinged rope and a friction sleeve arranged in the spring and used for friction energy dissipation with the inner wall of the spring; and a plurality of ductile energy consumption pieces, wherein the ultimate tensile strength of the ductile energy consumption pieces is smaller than the ultimate tensile strength of the springs, and the ductile energy consumption pieces are detachably arranged between and connected with the top plate frame and the elastic energy consumption assemblies. According to the invention, the falling stone collides with the protective net, so all the elastic energy dissipation assemblies are stretched to store energy, impact damage of a shed tunnel caused by concentrated release of kinetic energy of the falling stone at one part is avoided, energy is transmitted through soft contact, and strong impact force caused by hard collision is avoided.

The invention relates to the technical field of sewage treatment, particularly method and device for combined utilization and advanced purification of waste water at different pollution levels. The method comprises the conventional sewage treatment steps of sewage collection, physicochemical treatment, anaerobic treatment, aerobic treatment and sand filtration, in addition of a sewage control step. In the sewage control step, the chemical oxygen demand (COD) of sewage is controlled by using waste water at different pollution levels. In the physicochemical treatment step, the multi-stage physicochemical treatment method is adopted, and the physicochemical pond device structures and the physicochemical agents in the individual stages are different from each other, thereby reducing the COD value and the colority of the sewage and achieving the pretreatment effect before biochemical treatment. The sewage treatment method and the sewage treatment device can reduce the COD value of sewage from ten thousand to one hundred and ensure that the sewage meets the sewage drainage standard. The sewage treatment method and the sewage treatment device have the advantages of stable quality of the treated sewage, high treatment capacity and low treatment cost.