232results about How to "Act as a buffer" patented technology

The invention relates to a compact method for producing middle-wide strip steel, which comprises: using melt iron to process pretreatment; smelting liquid steel; refining liquid steel; continuously casting the middle-thin plate blank; step beam heater heats uniformly; high-pressure water scale breaker breaks scale; one-frame four-roller reversible roughing mill mills; hot winding box winds; cutting the head and end of middle blank; the high-pressure water scale breaker breaks scale; the finishing roll machine continuously rolls; cooling the interlayer flow; the underground winder winds; and transporting steel coil. Wherein, all processes are inside one workshop or connected workshops. The invention can be used in middle steel factory with 1-2 million ton / year yields to match the metal flow, temperature flow and time flow effectively, to feed the high-temperature non-defect sheet blank at 920Deg. C into step beam heater, to save energy more than 60%, improve 1-2% of metal yield, reduce the producing cost and reduce the transport cost of middle process.

The invention provides a safety head restraint device for actively buffering automobile collision. A supporting column is hinged at one end of a leaning rod; the other end of the leaning rod is fixedly arranged on a cylinder body at one end of a buffering supporting cylinder; a buffering supporting piston rod is arranged in the other end of the buffering supporting cylinder; the buffering supporting piston rod is fixedly arranged on an auxiliary supporting seat; and the auxiliary supporting seat is fixedly arranged at the upper end of a chair back. According to the invention, through the adoption of the buffering supporting cylinder, a buffering supporting effect is realized on the head restraint in the automobile collision process; as various elastic energy absorbing bag bodies are arranged in the head restraint, the collision energy can be first preferably absorbed; and as a buffering bracket is arranged at the back end of the active safe head restraint device, the collision energy can be further absorbed to reduce damages to heads of drivers. In addition, through the adoption of a cam and a locking pin, an auxiliary supporting rod can extend out of the head restraint at the moment of collision and is supported on the auxiliary supporting seat, an adverse consequence that the head restraint is tilted backward is prevented.

The invention relates to a method for controlling the surface roughness of silicon single-crystal liner material. According to the chemical property of silicon single-crystal liner material, the invention selects alkali medium; uses SiO2 hydrosol as abrasive; uses pH adjuster to adjust the pH value of solution 9-13.5; adds surface activator as FA / O to prepare the polish liquid. The invention uses two polishing steps as roughly polishing and finely polishing at different polishing conditions; roughly polishes for 10-20mins while the flux is 100-200ml / min, the temperature is 30-40Deg. C, the rotation speed is 40-120rpm and the pressure is 0.10-0.20MPa; finely polishing for 4-7mins while the flux is 800-1000ml / min, the temperature is 20-30Deg. C, the rotation speed is 30-60rpm, and the pressure is 0.05-0.10MPa. The invention can realize low roughness of single-crystal liner material.

The invention discloses a graphene-bismuth oxide composite material. The graphene-bismuth oxide composite material comprises graphene as well as bismuth oxide loaded on a graphene sheet layer, wherein the mass ratio of bismuth oxide to graphene is (0.005-0.25):1. The invention also discloses a preparation method of the composite material as well as lead carbon battery cathode diachylon comprising the composite material as well as a preparation method of the lead carbon battery cathode diachylon and a lead carbon battery cathode plate. According to the invention, the generation of hydrogen on the surface of graphene is inhibited by loading bismuth oxide on the sheet layer of graphene, so that the hydrogen evolution phenomenon of the lead carbon battery cathode plate is inhibited; the reduction of lead carbon battery current efficiency and the battery water loss phenomenon are prevented effectively; the service life of the lead carbon battery is ensured.

The invention discloses a method for treating liquefiable sandy soil foundations by using microbial bubbles, mainly targeting at liquefiable sandy soil layers, using liquid injection nozzles, hollow drill pipes, connectors, catheters, compressors, bacterial liquid storage tanks, etc. The device injects pre-enriched and cultured denitrifying bacteria liquid into the soil to replace pore water, and the bacteria perform denitrification in the pores to produce inert gases nitrogen and carbon dioxide. The nitrogen produced by biological metabolism in the pores can effectively reduce the soil saturation, increase the shear strength of the soil, and improve the soil's ability to resist liquefaction. Nitrogen dioxide produced by biological metabolism can induce the precipitation of calcium ions in the bacterial fluid to form calcite. Calcite has strong cementing properties, which can effectively improve the cohesion between soil particles, increase the shear strength, and can fill the pores of the soil, increase the compactness of the soil, and further improve its ability to resist liquefaction.

The invention discloses a preparation method of a cathode active substance for a lead carbon battery, and belongs to the technical field of the manufacturing of lead-acid storage batteries. The special lead carbon battery and a paste device are adopted, the components are mixed in the optimum proportion, and the dry mixing time, the wet mixing time and the acid mixing time in all steps are controlled, so that cathode lead paste for the lead carbon battery, which is good in production quality (the dispersity of carbon material is good), is controllable in process, and satisfies the requirements for battery performance, is obtained. Through the adoption of the lead paste, the large-current charging and discharging receptivity of the battery, and the cycle performance of the battery under a partial state of charge can be obviously improved, and the sulfation of the surfaces of electrodes can be inhibited, so that the battery has high power capacity and long cycle life.

The invention relates to an iron tailing soil improvement agent and an iron tailing soil improvement method. The iron tailing soil improvement agent comprises biochar, rice husks, ceramsite, organic fertilizers, attapulgite powder and planting soil. A mass ratio of the biochar to the rice husks to the ceramsite to the organic fertilizers to the attapulgite powder to the planting soil is (0.5-3):(0.2-1):(0.5-1.5):(1-4):(1-2.5):(1.0-2.2). The iron tailing soil improvement agent and the iron tailing soil improvement method have the advantages that the particle size of soil can be improved by theaid of the iron tailing soil improvement agent, the loss rate of water in the soil can be eased, the water retention capacity can be enhanced, organic matters can be quickly and effectively supplemented, the content of organic matters in tailing can be effectively increased, and suitable environments can be provided for plant growth; the rice husks and the ceramsite are matched with one another, the porosity of iron tailing soil can be improved, the hardening degree of the soil can be lowered, the tailing soil can keep in excellent gas-permeable and soft states for a long term, accordingly, the iron tailing soil improvement agent and the iron tailing soil improvement method are favorable for respiration of animals and plants in the soil, and the survival rate can be increased.

The invention discloses a novel composite contact vacuum arc-extinguishing chamber and a vacuum circuit breaker with the same. The novel composite contact vacuum arc-extinguishing chamber comprises a static side structure portion, a movable side structure portion and a shell structure. The static side structure portion comprises a static side arcing current conducting rod and a static side main conducting rod which is arranged in the static side arcing current conducting rod and is in clearance fit with the static side arcing current conducting rod. A static side arcing magnetic field contact and a static side annular arcing-resisting contact material are sequentially welded at the lower end of the static side arcing current conducting rod. A static side conducting contact is welded at the lower end of the static side main conducting rod. In the arcing process, the static side conducting contact is located inside the static side arcing magnetic field contact all the time, the static side main conducting rod is connected with the static side arcing current conducting rod through a static side small-diameter corrugated pipe, the static side arcing current conducting rod is connected with a cover plate on the upper side of the arc-extinguishing chamber through a static side large-diameter corrugated pipe. A static side compression spring is installed inside the static side large-diameter corrugated pipe. According to the novel composite contact vacuum arc-extinguishing chamber, the problem that the magnetic structural design does not exist in the existing vacuum arc-extinguishing chamber contact design is solved.

The invention relates to a servo double-arm clamping type bag feeding manipulator with slotting tools. In the servo double-arm clamping type bag feeding manipulator with the slotting tools, a driving shaft is rotatably arranged on a left base frame and a right base frame; the driving shaft is connected with an output shaft of a servo motor through a shaft coupling; a left-side bag feeding arm is fixed on the left end part of a connecting rod; a left-side gearwheel and a left-side pinion are rotatably arranged on the end part of the left-side bag feeding arm; a left-side gearwheel clamp is fixed on the left-side gearwheel; a left-side pinion clamp is fixed on the left-side pinion; a right-side bag feeding arm is fixed on the right end part of the driving shaft; a right-side bag feeding arm is fixed on the right end part of the connecting rod; a right-side gearwheel and a right-side pinion are arranged on the end part of the right-side bag feeding arm; a right-side gearwheel clamp is arranged on the right-side gearwheel; a right-side pinion clamp is arranged on the right-side pinion; a mounting frame is arranged in the middle segment of the driving shaft; a slotting tool shaft is arranged on the front end part of the mounting frame; and a left slotting tool and a right slotting tool are fixed on the slotting tool shaft. The servo double-arm clamping type bag feeding manipulator with the slotting tools solves the problems of fast bag feeding and shock vibration and shortens the switching time of a full bag and an empty bag so as to increase the packaging speed.

The invention discloses ecological organic biofertilizer and its preparation method and use. The ecological organic biofertilizer comprises, by weight, 10-15 parts of a mixture of nitrogenous fertilizer, phosphate fertilizer and potash fertilizer, 20-50 parts of an organic material subjected to fermentation decomposition, 15-30 parts of calcium-magnesium-silicon-potassium fertilizer and a nitrogen-fixing microorganism agent and / or a phosphate-solubilizing microorganism agent, wherein a ratio of the nitrogen-fixing microorganism agent and / or the phosphate-solubilizing microorganism agent to the ecological organic biofertilizer is in a range of 0.2-5.0%. The ecological organic biofertilizer can improve soil physical and chemical properties, improves a soil loosening degree after use and improves drought resistance and water retention capacities.

The invention discloses a method for asynchronous updating based on a buffer area. The method includes the steps that an updating request is submitted; whether a queue is empty or not is judged; if the queue is not empty, queue elements are extracted, and an updating request is ready to be processed; a latest upgrading threshold value is calculated, and the updating request is updated to the local; whether upgrading triggers an upgrading strategy or not is checked; if the updating strategy is trigged, distributed catch or a database is upgraded.

The invention provides a remediation method of alkaline soil, and relates to the technical field of soil improvement. The method comprises the steps of (1), soil preparation; (2), soil loosening agentapplication; (3), soil improving fertilizer application. According to the method, the alkaline soil is restored through the steps of soil preparation, soil loosening agent application, soil improvement fertilizer application and the like to reduce soil alkalinity, improve soil characteristics, loosen soil, increase soil fertility to gradually improve soil alkalinization, soil sterilization and fertilizer addition are conducted while the soil alkalinity is reduced, and the method is a remediation method which has the effects of alkaline soil conditioning agent and value improving and synergism.

The present invention relates to the field of reducers, in particular to an ultra-low noise reducer, including a reducer body and a shock absorbing base, the shock absorbing base includes a shock absorbing ring that engages with the reducer body and a support seat fixed below the shock absorbing ring, The shock-absorbing ring includes an upper shock-absorbing half-ring and a lower shock-absorbing half-ring, and the upper shock-absorbing half-ring sequentially includes a rubber buffer layer, an inner cast steel plate layer, a number of evenly arranged shock absorbing springs, and an outer cast Steel plate layer, each adjacent shock absorbing spring is fixed with a rubber shock absorber, the structure of the upper shock absorbing half ring is the same as that of the lower shock absorbing half ring, and the two ends of the outer cast steel plate layer are outward Extended to form a fixed ear, the upper shock-absorbing semi-circular ring and the fixed ear on the lower shock-absorbing semi-circular ring are engaged with each other, and are fixedly connected by fastening bolts. shaped groove, and the lower shock-absorbing semicircular ring is fixed in the arc-shaped groove; the invention has a simple structure, can achieve the purpose of reducing noise without practicing tools, and has wide applicability.

The invention relates to a method for controlling mechanically polished surface roughness of ULSI multilayer copper wire. It is characterized in that: it uses SiO2 hydrosol at small diameter as abrasive; uses organic alkali as the pH adjuster and complex builder; adds non-ionic surface activator to prepare the polish liquid; the preparation comprises following steps that first, preparing the polish liquid that a, diluting the SiO2 abrasive whose diameter is 15-20nm with the 1-5 times of deionized water; b, using pH adjuster organic alkali to adjust said solution, to make the pH value between 10-12; c, mixing and adding 0.5-10% (volume percentage) aether mellow activator to prepare the polish liquid; then, polishing form 3-5mins, while the flux is 3-5L / min, the temperature is 15-25Deg. C, the rotation speed is 30-120rpm, and the external pressure is zero that there is only the weight of carrier; the invention can effectively reduce the roughness of copper, baffle material and tantalum surface, via the strong complex function and accelerating the surface quantity transmission at alkali condition, with simple process and significant effect.

The invention discloses a controllable slow flow pollutant interception circulating module system based on sponge city construction. The system is arranged at the river facing side of a riverbank; a vegetation buffer zone is arranged downwards along the slope of the bank, then, water collecting and guiding zones are arranged downwards, and next, controllable water storage modules are arranged downwards, vertically and correspondingly, wherein each controllable water storage module is of a box structure built by using unit cuboids made of a polypropylene material and is respectively 100-120m long, 1-1.2m wide and 0.5-0.6m deep, and the length and amount of the controllable water storage modules are consistent with those of the water collecting and guiding zones; and the side, close to a river channel, of each controllable water storage module is vertically and downwards provided with a miniature slow flow wetland system which is sequentially provided with a planting soil layer, a packing layer and a supporting layer from top to bottom. The invention embodies a rainy-season runoff pollutant interception control and dry-season landscape water quality maintenance method which provides reference and guide effects for city non-point source pollution control, landscape water quality maintenance, new-built municipal rain discharging hole design and sponge city construction.

The invention discloses a ship fender device. The ship fender device comprises at least two parallel slide ways located on a quayside. Baffles are arranged at the two ends of the parallel slide ways, a pair of rollers are arranged in the parallel slide ways, the two rollers are connected through a spring buffer, each roller is hinged to one end of a supporting rod through a connecting shaft, the other ends of the supporting rods are hinged to a cylindrical ring at the same time, the cylindrical ring is fixed to a bottom plate, the bottom plate is fixedly installed on a steel frame structure, and a rubber fender is installed on the steel frame structure. According to the ship fender device, when a ship is drawn alongside, firstly, the ship makes contact with the rubber fender, the rubber fender and the ship interact, internal air is compressed to work to consume collision energy, the ship is primarily buffered, then the spring buffer is used for secondary buffering, compression springs carry out tertiary energy dissipation, when the ship collision energy is too large, air bags are inflated, and due to at least three times of energy dissipation, the energy dissipation effect is good.

The invention discloses an adjustable gob-side entry retaining wall with initial active and later buffering support and an implementing method thereof. The adjustable gob-side entry retaining wall with initial active and later buffering support and the implementing method thereof are mainly accomplished through the mode of completing prefabricating of components above a well and conducting masonry construction in a lane. Wall components mainly comprise a bedding block of a U-shaped structure, a lifting support block of a T-shaped structure, a friction crush block of a triangular structure, and a contractible crush block. The gob-side entry retaining wall has the advantages of being simple and reasonable in structure, good in supporting effect, adjustable in wall height, convenient to adjust, and strong in a adaptability; the main components used by the wall are all prefabricated above the well, intensity is guaranteed and quality is reliable. The implementing method is simple and convenient in operation, and a single hydraulic prop can be relied on to achieve wall position adjustment and active support can be provided by the single hydraulic prop to help cut off a lane gob side top plate; the wall is contractible so that pressure buffering function can be achieved; the accomplished gob-side entry retaining wall with initial active and later buffering support can adapt to the pressure change law of the gob-side entry retaining top plate.

The present invention relates to the liquor brewing field, and provides novel liquor flavoring agent and an application method in the wine brewing. The preparation method of the novel liquor flavoring agent comprises the following steps of fat enzymolysis, lipase inactivation and fat enzymatic hydrolysate emulsification. The novel liquor flavoring agent provides the application method in the wine brewing that the novel liquor flavoring agent is added during the wine base ageing or adding process. The novel liquor flavoring agent of the present invention contains a great variety of fatty acids, fatty acid monoglyceryl ester, fatty acid diglyceride, fatty acid triglyceride, and diethyl hydrine, thereby decreasing the irritating sensation and the bitter and astringent flavor of the wine, leading the residual taste of a wine body to be plump, bufferring the water taste in the low alcohol wine, and the wine body more soft and sweet in taste and smoother. The liquor flavoring agent is added in the aging period of the wine base, through the aging-acceleration for one month, the liquor can attain the effect that the wine base is stored for more years, the time used for adding the wine base is decreased, and the cost is reduced.

The invention discloses an underground cable laying device. The underground cable laying device comprises a trailer body, wherein a pay-off rack is arranged on the front side of the upper part of thetrailer body, and the rear side of the upper part of the trailer body is provided with a guide mechanism for guiding the paying-off in a cable well; the guide mechanism comprises a rectangular via hole which is formed in the rear side of the upper part of the trailer body; a rectangular barrel is arranged in the rectangular via hole in a lifting mode; a pair of upper rolling wheels are rotationally arranged on the inner side of the upper opening of the rectangular barrel, a pair of lower rolling wheels are arranged on the inner side of the opening in the lower portion of the rectangular barrelin a rotating mode; a pair of inverted L-shaped push plates are symmetrically arranged on the left side and the right side of the upper end of the rectangular barrel; and a first automatic telescopicrod is arranged on the trailer body and located below the inverted L-shaped push plates in the vertical direction; the situation that the cable insulation layer is damaged due to the fact that the cable is not guided when the cable is laid in the underground cable well can be effectively solved, the extending depth of the guide mechanism can be adjusted according to the depth of the cable well, so that it is ensured that the cable cannot be directly rubbed with the lower edge of the cable well after entering the cable tunnel.

The invention provides a vehicle steering column structure. One end of an upper rod piece (1) of the column structure is arranged inside a lower pipe fitting (2) in a sleeve mode, the upper rod piece (1) is provided with a through hole (3) in the upper rod piece (1), a plurality of barrier blocks (4) are arranged inside the through hole (3), two sides of the through hole (3) are respectively provided with a clamping column (5) in a sleeve mode, the bottom of each clamping column (4) abuts against the barrier blocks (4), the end portion of each clamping column (5) is arranged to the a structure protruding from the surface of the upper rod piece (1), the lower pipe fitting (2) is of a hollow structure, the inner wall of the lower pipe fitting (1) is provided with two protruding clamping holes (6), and when the upper rod piece (1) is arranged inside the lower pipe fitting (2) in a sleeve mode, the end portion of each clamping column (5) is inset into the corresponding clamping hole (6). The vehicle steering column structure can guarantee that a steering column crumples when a motor vehicle is in collision, avoids damage caused by collision of a rigid structure to a driver, and guarantees the safety of the driver.

The invention discloses an unmanned aerial vehicle (UAV) connected with a ground movable fire fighting device, include an unmanned aerial vehicle body, A light device is sequentially arranged at thatbottom end of the body of the unmanned aerial vehicle, water tanks and bomb delivery tanks, At that bottom end of the main body of the unmanned aerial vehicle, the cushioning device is arranged on thelighting device, Outside of the water tank and the bomb drop tank, A fire-fighting water pipe is connected to the water tank through a rotary joint, the other end of the fire water pipe is connectedto a ground movable fire fighting device, one end side wall of the water tank is provided with a mounting opening, A miniature pump is installed in the mounting port, the input end of the miniature pump is arranged inside the water tank, The output end is provided with a water spraying head, and the UAV body is provided with a camera and an infrared temperature sensor. The invention has simple structure and is convenient to use, and can detect fire situation under dim conditions. Due to the flexible characteristics of the UAV, water can be sprayed from the high altitude to an area that is difficult to enter on the ground, thereby improving fire fighting effect and fire extinguishing efficiency.

An underwater docking device used between underwater manned vehicles comprises an upper unit and a lower unit, wherein the upper unit and the lower unit are respectively arranged on the two underwater manned vehicles to be docked; the upper unit and the lower unit each comprise a hollow shell; the two hollow shells are respectively in communication with compressive cabins of the two underwater manned vehicles via opening and closing doors; the interiors of the two hollow shells communicate with each other after the two hollow shells are closed; clamping columns are arranged on two sides of the end, used for docking, of the upper unit; fork frames and locking rings are arranged on two sides of the end, used for docking, of the lower unit; the fork frames are positioned between the locking rings and the hollow shell of the lower unit; the locking rings can be supported on vertical hydraulic cylinders in a vertically turnover manner; through the turnover of the locking rings, the locking rings can sleeve the clamping columns or be separated from the clamping columns; when the locking rings sleeve the clamping columns, the clamping columns are locked through up-and-down clamping of the locking rings and the fork frames; the upper unit comprises a pipeline for supplying gas to the hollow shell; and the lower unit comprises a pipeline for supplying seawater to the hollow shell and draining the seawater in the hollow shell. The underwater docking device used between the underwater manned vehicles can safely and reliably finish underwater docking between the underwater manned vehicles.

The invention provides a clustered fiber Bragg grating sensor, which includes a plurality of optical fibers. Each optical fiber is provided with a plurality of gratings through the etching process. The plurality of optical fibers with the gratings etched thereon are clustered and packaged within a single plane or a beam tube. The clustered fiber Bragg grating sensor is small in splicing loss, simple in operation process, high in detection resolution, easy to package, high in survival rate and small in size. Meanwhile, the line detection, the surface detection and the body detection, subjected to large-area temperature strain, are enabled.

The invention discloses an anti-collision buffer brake device for a crane, which belongs to the technical field of cranes and mainly comprises a sinker bar, an elastic device, a connecting rod mechanism and a brake mechanism, wherein the sinker bar is mounted on a vehicle body of the crane in a sliding manner and extends out of the vehicle body, the elastic device is mounted between the vehicle body and the sinker bar, the brake mechanism is used for braking a travelling wheel of the crane, the connecting rod mechanism is used for connecting the sinker bar with the brake mechanism, one end of the connecting rod mechanism is hinged on the sinker bar, and the other end is hinged on the brake mechanism. The anti-collision buffer brake device for the crane can convert the collision energy to the action force of the brake mechanism, avoid the impacts caused by the collision of a travelling vehicle of the crane and improve the safety performance of the crane.

The invention discloses a junction box for network engineering. The junction box comprises a junction box body, wherein a box cover is rotatably connected with a side wall of one side of the junctionbox body by a hinge, a wiring board is arranged in the junction box body, an outgoing line hole is formed in the bottom of the junction box body, three positioning assemblies are arranged at one sideof the wiring board and are uniformly arranged in a staggered way, the positioning assemblies are arranged on an inner wall of the junction box body, and a branching assembly is arranged on the outgoing line hole. By designing the positioning assemblies, different fiber bundles are staggered and positioned, fibers can be regularly disked in the junction box, the phenomenon of wire twisting is prevented, branches are clear, connection and maintenance of a circuit are facilitated, and fiber disking is more convenient; and the branching assembly is arranged on the outgoing line hole of the branching box, the circuit is cleared by the branching assembly, and meanwhile, rubber pads are arranged on inner walls of line through grooves for fixing the fibers have certain effects of buffering and fixing.

The invention relates to a mixed modular roof greening system. The mixed modular roof greening system is characterized in that a plurality of green plant fixing grooves are formed in a roof, a waterproof cushion layer is laid on each green plant fixing groove, a green plant fixing mechanism is arranged in each green plant fixing groove, the green plant fixing mechanisms are arranged on drainage cushion layers and comprise mechanism shells, planting cavities are arranged in the mechanism shells, a first nutrition layer, a second nutrition layer and a third nutrition layer are sequentially laid in each planting cavity from bottom to top, and a drain pipe is arranged on the roof and is communicated with the drainage cushion layers. The mixed modular roof greening system has the advantages that greening varieties can be diversified, the mixed modular roof greening system is convenient to maintain, and the roof greening rate can be increased.

Composite body armor comprises a bullet absorbing layer, a protection layer, a buffering layer and an energy absorbing layer from exterior to interior. The bullet absorbing layer is used for absorbingbullets so as to avoid stray bullet generation, two carbon fiber layers and an aluminum foam layer are included, and the aluminum foam layer is sandwiched between the two carbon fiber layers. The buffering layer is used for converting point impacts into face impacts. The absorbing layer is used for absorbing deformation of the buffering layer. The composite body armor can effectively avoid straybullet generation and fighting personnel rib fracture danger caused by excessive impact force.

The invention discloses a housing structure top corner protecting device which comprises a support base arranged at the inner side of a housing structure and a support pipe arranged the outer side of the housing structure, wherein the two ends of the support pipe are positioned on the two side walls of the housing structure respectively; the middle of the support pipe is bent towards the direction far away from the support base to form an arch structure; two through hole structures are arranged on the housing structure; the two ends of the support pipe penetrate through the through hole structures and are in threaded connection with the support base; a cushion layer is arranged at one side, facing towards the inner wall of the housing structure, of the support base; locking nuts arranged at the ends, close to the housing structure, of the support pipe; and rubber cushions are arranged at the sides, facing towards the housing structure, of the locking nuts. With the adoption of the support pipe supporting the outer side of a top corner part of the housing structure, the support pipe exerts a cushioning effect when an external force impacts, and the top corner part of the housing structure is prevented from being damaged.