91results about How to "Safe and reliable structure" patented technology

The invention relates to the technical field of compressed air energy storage, in particular to a compressed air energy storage artificial cavern structure under the local soft rock stratum condition and a construction method. A plurality of pipelines are arranged in the soft rock cavern, and the two ends of the pipelines are connected with the steel linings in the hard rock cavern in a sealed mode through the end sealing plates, so that the sealing performance and the gas circulation performance of the gas storage cavern are guaranteed; the high internal pressure is mainly borne by the steel pipe, and the small-proportion internal pressure transmits the internal pressure of the pipeline to surrounding rock through concrete between the pipelines. Compared with a steel lining in a hard rock cavern, a plurality of steel pipes with smaller diameters are arranged in the soft rock cavern, so that the internal pressure load sharing rate of soft surrounding rock is favorably reduced, the deformation of the surrounding rock is reduced, and the structural safety is ensured. According to the scheme, a new design concept is provided for application of the compressed air underground gas storage cavern structure under the condition of the local soft rock stratum, and the flexibility of site selection is improved.

The invention discloses an aero-engine core engine rotor press-fitting assembly device which comprises a supporting rod, a mounting base, a pull rod and an upper pressing plate which are sequentially arranged from top to bottom, a lower base is further arranged in the center of the top face of the mounting base, and connecting blocks are evenly arranged on the top face of the mounting base around the lower base. The bottom of the connecting block downwards penetrates through the mounting base and is connected with an actuating cylinder arranged at the bottom of the mounting base, the bottom of the pull rod is connected with the connecting block, a pull rod connecting clamping groove is formed in the position, right opposite to the pull rod, of the edge of the upper pressing plate, and a pressure sensor and an electronic display screen are further arranged on the top face of the lower base. The pressure sensor is located between the rotor and the lower base and is in electric signal connection with the electronic display screen. The problems that when a high-pressure compressor rotor and a high-pressure turbine rotor are assembled, due to interference of interference spigots and warping of installation edges, the rotors cannot be tightly attached, rotor assembly jumping is unqualified, and a main machine vibrates are solved.

The utility model discloses a quick plugging suite in the field of connectors, which comprises a module end plug and a plurality of detection end plugs, and each detection end plug is provided with a different number of connection ports; the plurality of detection end plugs are connected with the module end plugs in a matching manner; wherein the module end plug and each detection end plug can be plugged and fixed, a lock catch is arranged on the module end plug, a locking piece is arranged on each detection end plug, the module end plug and the detection end plug are fixed, and the lock catch is matched with the locking piece to be used for retaining the module end plug and the detection end plug; the detection end plug is matched with the plurality of module end plugs, a single detection end plug can be fixedly installed with the plurality of module end plugs, signal access of detection devices of different wiring systems to the PLC analog quantity input module can be met, program modification and wire changing are not needed when different types of detection devices are replaced, and the detection efficiency is improved. And the misoperation risk in the equipment maintenance working process is reduced.

The utility model relates to the technical field of low-voltage power distribution, and discloses a low-voltage power distribution circuit and a power distribution box for uninterruptible power maintenance, the circuit comprises a main incoming line switch circuit breaker, a main busbar, a plurality of branch switch circuit breakers with different rated currents, a zero line busbar and a ground wire busbar; the main incoming line switch circuit breaker is electrically connected to a low-voltage power supply system, the main busbar is electrically connected to the main incoming line switch circuit breaker, the plurality of branch switch circuit breakers are electrically connected to the main busbar, a zero line access end of each branch switch circuit breaker is connected with the zero line busbar, a ground line access end of each branch switch circuit breaker is connected with the ground line busbar, and the main incoming line switch circuit breaker is electrically connected with the main busbar. The confluence end of the zero line busbar is connected with a zero line of the low-voltage power supply system, and the confluence end of the ground line busbar is connected with a ground line of the low-voltage power supply system. Compared with the prior art, the circuit provided by the utility model can directly select the output mode of the corresponding output unit to adjust the impedance load or replace the shunt without interrupting the total power, and is safe and reliable in structure and convenient to operate.

The present invention discloses an assembled revetment, including a pile foundation inserted into the soil, a pile head is provided on the top of the pile foundation, a groove is provided on the side of the pile head, a corbel is provided on the bottom of the pile head, an opening matched with the pile head is provided on a prefabricated bottom plate, a vertical baffle extending upward is provided on one side of the prefabricated bottom plate, a lower vertical plate extending downward is provided on the other side of the prefabricated bottom plate, the prefabricated bottom plate is placed horizontally, a reserved opening passes through the pile foundation, the lower vertical plate is inserted into the soil close to the pile foundation, the prefabricated bottom plate is framed on the corbel of the pile foundation, the pile head extends above the prefabricated bottom plate, fasteners are installed at the groove positions on both sides of the pile head, the fastener tenons are tightly fitted with the grooves on the side of the pile head, the bottom of the fastener is against the bottom plate, the pile head kit is sleeved on the periphery of the pile head and the fastener, so that the three form a whole, and the pile head is locked on the bottom plate. The assembled revetment structure of the present invention is reliable, the components can be orderly dismantled according to demand, no waste concrete is left in the soil body, and the impact on the ecology is reduced.

The utility model relates to the technical field of water pumps, in particular to an integrated self-suction double pump which comprises a top cover, a water inlet and outlet housing, a suction cup assembly and a driving mechanism. The top cover covers the front port of the water inlet and outlet housing, and a water inlet and at least two water outlets are formed in the top cover; a water inlet space and at least two water outlet spaces are arranged in the water inlet and outlet housing; the suction cup assembly is installed at the rear end of the water inlet and outlet housing, suction force is provided for water flow in the water inlet space through deformation, the suction cup assembly pushes sucked water into the water outlet space through deformation, and then the water is pushed out through the water outlet. The driving mechanism is connected with the suction cup assembly and used for providing power for the suction cup assembly so as to extrude the suction cup assembly to deform the suction cup assembly, the double pump with the multiple water outlets is designed, water outlet of each water outlet can be independently controlled to be opened and closed, the structure is simple, and production and assembly are easy.

The invention provides a construction method of an offshore fixed storage device. The construction method comprises the steps that a cylindrical storage device is machined and manufactured in a steel structure factory; shipping and transporting to a construction sea area; the floating crane lifts and turns over the storage device; the floating crane is matched with the vibratory hammer to insert and beat the cylindrical storage device to a stable seabed; mud is sucked in the material storage device, and impurities are cleaned; leaking stoppage bottom sealing concrete in the material storage device is poured; and finally, a storage device vertical ladder stand, a top opening operation platform and a top opening sealing cover plate are installed. The material storage device can be quickly constructed and fixed under the condition of a complex sea area, the investment of construction equipment and resources is small, the efficiency is high, and the construction cost can be reduced. The storage device is filled with leaking stoppage concrete, it is ensured that a waterproof storage space is formed between the structure and an external sea area, the structure is safe, and the device can be used for civil air defense engineering under special conditions.

The utility model discloses a prefabricated truss concrete structure assembly type fence and sound insulation wall. The prefabricated truss concrete structure assembly type fence and sound insulation wall comprises a plurality of truss concrete wall column units prefabricated in a factory and a plurality of truss concrete wall plate units prefabricated in the factory and arranged between the adjacent truss concrete wall column units. Each truss concrete wall plate unit comprises a concrete plate and a plurality of connecting plates I, a plurality of sound insulation quantity reduction holes are formed in each unit at intervals, and the upper end and the lower end of each truss concrete wall plate unit are further provided with a water retaining upper rabbet and a water flooding lower rabbet respectively. A wallboard steel truss and an anti-crack steel mesh are arranged in the concrete slab, and the connecting plate I is installed on the wallboard steel truss. The truss concrete wall column unit comprises a concrete column and a plurality of connecting plates II, a wall column steel truss and an anti-crack steel mesh are arranged in the concrete column, and the connecting plates II are mounted on the wall column steel truss. The wall plate units and the wall column units are connected through connecting plates. The assembling degree is high, the structure is safe, and parts can be directly detached, can be partially replaced and can be repeatedly used.

The application discloses a magneto, which comprises a shell, a magnetic core, a spring, a shear plate, a shear pin and a coil; the magnetic core is arranged in the shell; the spring is arranged between the magnetic core and the shell, and the lower end of the spring is abutted against the inner side surface of the shell; the shear plate and the guide cylinder are sleeved on the outer side surface of the magnetic core, and the upper end of the spring is abutted against the bottom of the shear plate; the shear pin is arranged on the shear plate and is inserted into the magnetic core; the magnetic core is cut off from the shear pin when moving downwards in the shear plate; the bottom of the shell is provided with the coil; the magnetic core enters the coil after being cut off from the shear pin, so that the coil generates an induced voltage. The magneto of the application can cut off the shear pin under the condition of low acceleration and long duration, and the magnetic core can pass through the coil under the guidance of the guide cylinder to generate an induced voltage, so that the purpose of triggering the magneto is achieved; the structure of the magneto is safe and reliable; the magneto is low in cost and can be triggered under specific conditions.

The invention discloses a structure for a joint of a road underpass and a rear opening of an existing underground structure, which comprises the existing underground structure, and the rear opening is formed in the side wall of the existing underground structure; the protective ring beam is poured on the outer side of the side wall, the protective ring beam is arranged in a circle in the circumferential direction of the rear opening, and a rubber water stop strip is embedded in a construction joint between the side, facing the side wall, of the protective ring beam and the existing underground structure; the road underpass channel is coaxially arranged on the other side, away from the side wall, of the protective ring beam, and a deformation joint is formed between the road underpass channel and the other side of the protective ring beam; and the water stop belt is arranged in the deformation joint, and the two opposite sides of the water stop belt are buried in the road underpass channel and the protective ring beam correspondingly. The problem that the waterproof effect is poor when the rear opening is connected under the condition of asynchronous construction of the road underpass and the existing underground structure is solved.

The utility model relates to lighting lamps and lanterns technical field, specifically disclose a kind of ceiling lamp with hidden type adjusting structure and multifunctional integrated unit to solve the problem that existing product mounting structure is exposed, inconvenient and low function integration degree is adjusted.The ceiling lamp includes lamp body, mounting plate, light source module and driving power supply.The core of its technical scheme is: set hidden type installation component, including the hook that can be turned over and stored in the recess of lamp body and the pressing plate for fixing the hook;And integrated light parameter adjusting component, including the openable code cover on lamp body and the code switch group arranged below it, the code switch group is used to preset the lighting mode, color temperature and power of light source.The utility model realizes the simple and beautiful appearance of lamp by hiding and integrating functional structure, provides double operation approach of professional preset and convenient user control, enhances the practicality, safety and market competitiveness of product.

The invention provides a construction method for in-situ assembly of a single-wall steel hanging box cofferdam, a telescopic and hanging cross-shaped beam assembly is used as an assembly bracket, the cross-shaped beam assembly comprises a cross-shaped main beam body formed in a cross-shaped crossing mode, and four branches of the cross-shaped main beam body form guide sleeves respectively; each group of cross-shaped main beam bodies is provided with a plurality of guide sleeves, a telescopic beam piece is arranged in each guide sleeve in a sliding and sleeved mode, each telescopic beam piece can retract or stretch out of the corresponding guide sleeve in the branch extension direction, each group of cross-shaped main beam bodies are installed in the corresponding steel casings, and holes allowing the telescopic beam pieces to stretch out and draw back are formed in the steel casings. And the cross-shaped main beam body is supported and fixed by a bearing bracket which is welded and fixed on the inner wall of the steel casing. The telescopic cross-shaped beam is used as the in-situ assembly bracket of the single-wall steel hanging box cofferdam, the cross-shaped beam is used for a cofferdam hanging system in the later period, one structure has two purposes, the structure is safe and reliable, the problem that the bracket is difficult to cut off after cofferdam assembly is completed is solved, the construction difficulty is small, and the construction period and the cost are saved.

The utility model relates to a kind of high-altitude temporary welding platform of large-span pipe truss steel structure, including main support structure, suspension box body;Main support structure has a platform, and the platform both sides extend a suspension box body downwards;Platform includes several two first channel steels arranged in parallel along transverse direction, the second channel steel of multiple frames is arranged on the top of first channel steel along longitudinal direction, longitudinal support rod and first grid plate laid on the upper portion of multiple longitudinal support rods in transverse direction;Suspension box body is provided with the step that can be climbed to platform upwards;The transverse inner side of the top of suspension box body is immediately adjacent to the truss top chord pipe needing to be welded.This utility model utilizes the platform formed by the pair of top chord pipe of pipe truss steel structure, which is the same height or close to height, to provide reliable support for the platform of main support structure, so as to realize the walking function of personnel from the top of platform, and in the process of welding operation, it can be conveniently moved to the opposite side, thereby improving the efficiency of welding operation in the lengthening direction of top chord pipe.

The application discloses a novel connecting structure for large-span steel-bamboo buildings, and belongs to the technical field of large-span buildings. The connecting structure comprises a supporting body which is formed by mutually splicing a plurality of connecting units, long steel-bamboo poles are connected to the periphery of the supporting body, a central lifting point is arranged directly above the supporting body, and a plurality of lifting pieces are connected between the supporting body and the central lifting point. The connecting unit comprises a plurality of short steel-bamboo poles which are in equal-angle radial distribution and are connected at the ends, and the ends of the short steel-bamboo poles are fixed through connecting nodes. Two adjacent connecting units are connected through the connecting nodes or through a shared short steel-bamboo pole. The novel connecting structure for large-span steel-bamboo buildings fully utilizes the initial vertical form of natural steel bamboo, and combines the novel connecting node to form a novel building structure system, which is characterized by low cost, structural safety and building aesthetics, and can be used for large-span steel-bamboo buildings.

The invention relates to a QEC (Quality Error Correction) maintenance safety supervision method and system based on AR (Augmented Reality). According to the method, after a maintenance general task is generated, the maintenance general task is decomposed into a plurality of sub-tasks and sent to pre-obtained online AR equipment, and a maintenance piece where each sub-task is located and a target model are obtained; obtaining an associated sub-task set according to the maintenance piece associated sub-tasks; when the current sub-task is executed, acquiring a marked sub-task from the associated sub-task set of the current sub-task; acquiring a real-time model of a maintenance piece where the marked sub-task is located, and executing the next sub-task if the real-time model meets a first preset condition before and after the current sub-task is executed; if the real-time models of the maintenance pieces where all the sub-tasks are located in the current associated sub-task set meet a second preset condition, the associated sub-task set is qualified; and when the completion time of all the sub-tasks and the total task real-time model meet a third preset condition, the maintenance total task is qualified. Compared with the prior art, the method has the advantages of improving data analysis efficiency and accuracy in QEC maintenance work and the like.

The invention provides an offshore wind power pile foundation design method considering a pile sinking effect and soil response, and relates to the technical field of offshore wind power engineering.The method comprises the steps that the marine environment of a target sea area, a fan structure and initial pile foundation design parameters are obtained; pile sinking disturbance factors are calculated based on the parameters, and then actual mechanical parameter distribution of the soil body after pile sinking is determined; calculating a coupling response coefficient based on the distribution, and correcting a pile-soil interaction model according to the coupling response coefficient; carrying out dynamic response analysis on the pile foundation under long-term cyclic loading by utilizing the corrected model, and calculating the displacement, the internal force and the accumulated rotating angle of the pile foundation; and comparing and checking a calculation result with a design allowable value, and obtaining a final design scheme through iterative optimization. According to the method, coupling analysis of the pile sinking effect and the power response in the service period is achieved, and the safety and economical efficiency of design are improved.

The utility model relates to the field of sightseeing electric vehicles, in particular to a hub structure of an electric vehicle, which comprises a hub main body, one of main bodies used for supporting the sightseeing electric vehicle to run, and a tungsten carbide metal protective layer adhered to the inside of the hub main body and used for enhancing the firmness of the hub main body. The hub structure is provided with the mounting disc, the spacing ring, the first staggered wheel spokes, the small airflow heat dissipation openings, the second staggered wheel spokes and the large airflow heat dissipation openings, and when the hub structure is used on the sightseeing electric vehicle, the first staggered wheel spokes and the second staggered wheel spokes are attached to the two sides of the mounting disc to support the hub body; due to the fact that the first staggered wheel spokes and the second staggered wheel spokes form staggered supporting, the staggered supporting can enhance the supporting stability and the bearing capacity in the hub body to guarantee the structural safety, and then the stability is enhanced through cooperation with the tungsten carbide metal protection layer attached to the interior of the hub body, the hub structure has good bearing capacity.

The utility model discloses a deviation rectifying device, belongs to the technical field of battery detection devices, and particularly relates to a cam-driven battery cell deviation rectifying device which comprises a cam mechanism, a deviation rectifying mechanism, a positioning mechanism and a visual mechanism, the deviation rectifying mechanism is mounted on the cam mechanism and is linked with the cam mechanism; the cam mechanism is driven to move up and down along with the rotation of a cam on the cam mechanism, so that the deviation rectifying mechanism moves left and right in a cam chute through a cam follower, and a friction wheel on the positioning mechanism is contacted with and separated from a battery cell on the deviation rectifying mechanism; during contact, the battery cell is driven to rotate through the friction wheel, and a visual sensor of the visual mechanism accurately positions the battery cell in a point finding manner; the utility model provides a visual deviation rectifying device which is safe and reliable. And a reliable technical guarantee is provided for high-beat and high-stability X-ray cylindrical battery detection.

A hole filling device for a road coring hole comprises an annular cylinder, an outer cylinder and an inner cylinder, a circular truncated cone is arranged at the bottom of the inner cylinder, and a ball is arranged at the top of the circular truncated cone; the rotary adjusting assembly comprises a plurality of sawtooth rods and a gear column, and the bottom of the gear column makes contact with the ball; the tooth sections of all the sawtooth rods sequentially penetrate through the outer cylinder and the inner cylinder and then are directly meshed with the gear column penetrating through the inner cylinder. The gear column is controlled to rotate so that all the sawtooth rods can be driven to rotate in the forward direction or the reverse direction, all the sawtooth rods are synchronously driven to extend outwards or contract inwards, and therefore the outer ends of all the sawtooth rods abut against the inner wall of the hole to be fixed or not make contact with the hole. The hole protection device is simple in structure and easy to operate, the hole can be rapidly and accurately closed and protected, the hole protection device can be firmly fixed into the hole, meanwhile, the hole structure can be effectively protected, and normal walking is not affected; the operation is safe, the efficiency is high, and the device can be taken out reversely and reused.

The invention provides a nested telescopic berthing pile which comprises a hollow annular box, hydraulic cylinders, cushion blocks, an integrated hydraulic station, a vibrating pile hammer, an inner pile, a hydraulic holder and an outer pile, the hollow annular box and the top of the outer pile are welded together, the multiple hydraulic cylinders are annularly installed on the hollow annular box, the heads of rod bodies of the hydraulic cylinders are connected with plug pins, and the plug pins are connected with the cushion blocks. The bottom of the hydraulic station is connected with the hollow annular box through the buffering element, the lower portion of the vibration type pile hammer is provided with a clamp which clamps the top of the inner pile, the hydraulic clamp clamps the inner pile, and annular groove type mechanical check rings are welded to the two limiting positions of the upper portion and the lower portion of the inner pile. The groove is matched with the cushion block of the hydraulic clamp holder, so that the inner pile and the outer pile are fixed together, and the whole body is in two telescopic length states. The nested telescopic gauge pile overcomes the defects of the integral gauge pile, and is low in integral gravity center, safe in pile frame structure and high in operation efficiency.

The utility model relates to power construction auxiliary equipment technical field, concretely relates to a multifunctional tool box for electric power engineering, including tool box body, storage component, storage component installs at one side of tool box body, and storage component is used for storing the tool, lighting assembly, lighting assembly installs inside tool box body, and lighting assembly is used for lighting. Compared with prior art, the application provides stable lighting, tool classification storage and convenient access, and the function of quickly setting up a temporary work platform under insufficient light environment by setting lighting assembly, storage component and flat plate structure, the practicability, multifunctionality and on -the -spot operation efficiency of tool box are improved significantly, and the single function, inconvenient use problem of traditional tool box is solved.

The invention provides a self-sensing assembly type ballastless track structure and a construction method, the self-sensing assembly type ballastless track structure comprises a plurality of ballastless tracks, and each ballastless track comprises a track plate. A plurality of first limiting holes are formed in the middle of the track plate, every two adjacent first limiting holes are communicated through a first groove, the bottom plate is arranged below the track plate and comprises a plurality of limiting bosses, each limiting boss is contained in the corresponding first limiting hole, and a containing space is reserved between the outer wall of each limiting boss and the inner wall of the corresponding first limiting hole. The optical cable comprises a grating array temperature sensing optical cable, and the grating array temperature sensing optical cable enters the first containing space from the position between the track plate and the bottom plate, extends into the first groove and then goes out of the track plate and the bottom plate through the second containing space. The fiber bragg grating temperature sensing optical cable and the ballastless track structure are integrally designed and constructed, and full-time, full-domain and full-period monitoring in the construction and operation process is achieved.

The present invention discloses a device and method for adjusting the horizontal angle of the inclined cable of the cable basket of a variable-section π-beam PC cable-stayed bridge; the device and method are provided with an adjustment system and a spherical pad system; the adjustment system on the adjustment beam and the spherical pad system work together to finally achieve precise adjustment of the horizontal angle of the inclined cable of the cable basket. The adjustment system is anchored on the arc-shaped bow web through the inclined cable; the adjustment system is composed of a main beam, a main beam leveling block, a main beam limit system and a pull rod adjustment system. The method sets an adjustment beam on the arc-shaped bow of the cable basket, and adjusts the adjustment system on the beam and the spherical pad system work together to finally achieve precise adjustment of the horizontal angle of the inclined cable of the cable basket. The method effectively solves the problem that the anchoring point at the end of the inclined cable beam of the ultra-wide variable-section PC cable-stayed bridge is constantly changing, and conventional angle adjustment methods are not applicable.

The utility model relates to the technical field of spiral hemming bins, and discloses a novel spiral hemming bin which comprises a foundation platform, carbon fiber cloth is arranged in the foundation platform, a reinforcing device is arranged on the foundation platform and comprises a plurality of vertical reinforcing ribs, the vertical reinforcing ribs are all inserted into a foundation base, and the carbon fiber cloth is arranged on the foundation base. Vertical reinforcing ribs are arranged on the upper surface of the silo body, silo body wall plates are welded to the outer surfaces of the vertical reinforcing ribs, inserting grooves are formed in the top ends of the outer surfaces of the silo body wall plates, rubber sealing strips are fixedly installed on the inner walls of the inserting grooves, silo tops are arranged on the upper surfaces of the silo body wall plates, and inserting plates are fixedly connected to the lower surfaces of the silo tops. According to the hemming bin, the carbon fiber cloth with the manufacturing cost lower than that of a steel plate is adopted, a viscose bonding mode is adopted in the construction method, compared with a traditional welding mode, construction is easy, welding seams and corrosion to a zinc coating of the bin are avoided, and the stability of the hemming bin is further improved.

The present invention discloses an electric pulse unblocking device and a multi-stage continuous liquid-electric pulse unblocking equipment, the device comprising a shell, the shell comprising a controller, an energy storage capacitor, a vacuum trigger device and a positive electrode column connected in sequence through a steel pipe cable, and a negative electrode column is correspondingly arranged below the positive electrode column. The positive and negative electrode columns are fixed in the shell by insulating materials, and a cavity is formed between the insulating materials for storing liquid. The shell is provided with perforations at the cavity position for liquid to enter and exit the cavity. The device comprises more than two electric pulse unblocking devices. The device of the present invention integrates a pulse generator, and has a simple, compact and complete structure. The single energy release of the liquid-electric pulse unblocking device can be changed by setting different parameters of the controller; the device of the present invention can realize multi-stage pulse discharge, form a multi-dimensional unblocking area, and also adapt to a variety of underground environments.

The application discloses a composite locking structure for mountaineering, and belongs to the technical field of outdoor protective equipment, which is used for providing a composite locking structure for mountaineering which is safe and more convenient to wear and remove, comprising a cover, a plug-in buckle body and a rear-end open shell, the front end of the shell is provided with a gap opening through the front and rear end faces, a lock cylinder is arranged in the shell, the lock cylinder comprises a sliding plate, the front face of the sliding plate is provided with a blocking block, the front face of the blocking block is provided with an unlocking button, and the front face of the sliding plate is further provided with four lock hooks, the end of each lock hook away from the sliding plate is provided with a hook claw, and the four side walls of the shell are provided with plug-in interfaces through the inner and outer walls. The lock cylinder structure with four lock hooks can simultaneously lock and unlock the plug-in buckle body in four directions, the safety belts do not need to be connected one by one when being worn, and the safety belts do not need to be unlocked one by one when being removed, so that the composite locking structure is more convenient to wear and remove the mountaineering safety belts.

The invention relates to a steel module building based on a light steel structure and a mounting method thereof, belongs to the technical field of module buildings, and solves the problems of multiple beams, multiple columns and double plates and double walls of a steel module building in the prior art. The steel module building based on the light steel structure comprises a plurality of light steel box body module units, the light steel box body module units are arranged in multiple layers and multiple rows, every two adjacent light steel box body module units on the same layer share one wallboard, and every two adjacent light steel box body module units on the upper layer and the lower layer share one floor slab. The light steel box body module units share the wall plates and the floor plates at the splicing positions to form a single-plate and single-wall splicing structure instead of a multi-beam, multi-column and double-plate and double-wall splicing structure, the steel consumption of a steel module building is remarkably reduced, and the structural cost is reduced.

The three-position deflection oil cylinder comprises a large piston rod and a small piston rod, the top end of the large piston rod is connected with a large piston through threads, the top end of the small piston rod is connected with a small piston through threads, the large piston and the small piston are located in a cylinder body, and an oil cylinder upper base and an oil cylinder lower base are arranged at the two ends of the cylinder body respectively. The small piston rod is sleeved with the oil cylinder upper base, the large piston rod is sleeved with the oil cylinder lower base, a first oil inlet is formed in the center of the top of the oil cylinder upper base, a third oil inlet is formed in the center of the top of the oil cylinder lower base, and a second oil inlet is formed in the center of the top of the surface of the cylinder body. In the moving process of the oil cylinder, balance and stability can be achieved, the structure is simpler, machining is more convenient, accurate control over multiple strokes can be achieved, the structure is safer, intercommunication oil mixing and pressure relief of a middle-position oil port in the oil cylinder can be well prevented through the adopted sealing mode, and the function failure of the oil cylinder after oil mixing is effectively prevented.

A sound absorption structure for a volute of a noise-reducing centrifugal fan and its air inlet, wherein a sound absorption plate is fixed on the volute side plate by a mounting plate, and a muffler chamber is formed between the sound absorption plate and the volute side plate; a plurality of web sound absorption plates are evenly arranged horizontally and vertically on the volute web plate; a plurality of obliquely arranged arc guide blocks are arranged on the arc-shaped side wall of the volute air inlet. Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention adopts a spatial sound absorption structure design, which greatly increases the sound absorption "effective area"; has a good noise reduction effect; has a safe and reliable structure, and does not require repeated maintenance and replacement during the service life; the sound absorption material has little effect on the fan performance, and the effect on the fan efficiency is less than 1%; and can be widely used in ventilation and air supply industries with high requirements for environmental comfort (low noise).