80results about How to "Flexible assembly" patented technology

The application relates to the field of assembly building technology and discloses an assembled sound insulation and shock absorption laminated floor slab, which comprises a pouring plate, the outer part of the pouring plate is provided with a cladding structure, the cladding structure comprises a main frame, a side stop, an upper stop rod and a connecting groove, the two upper stop rods are fixedly installed on the side stop, the upper stop rod can be detachably connected with the main frame and forms a box body structure to cladding the pouring plate, a connecting groove is arranged on one side of the main frame, and a protrusion is fixedly arranged on the other side of the main frame; and a cushion block assembly, the pouring plate is assembled with the main frame, the side stop and the upper stop rod at a construction site after being prefabricated in a factory, the modular design makes the components separable for transportation, the size and weight of a transportation unit are greatly reduced, the transportation cost and hoisting difficulty are reduced, the on-site assembly is flexible, the size deviation of the actual installation position can be fine-tuned, and the adaptability is high.

This invention relates to the field of prefabricated structure technology for energy storage power stations, specifically to a prefabricated foundation structure for an energy storage power station equipment compartment, its design, and construction method. The foundation structure includes prefabricated corbel columns, prefabricated connecting beams, and connecting components. Multiple sets of prefabricated corbel columns are arranged in an array at intervals. Prefabricated connecting beams are provided between adjacent sets of prefabricated corbel columns, and these beams are connected to the prefabricated corbel columns via connecting components. The prefabricated foundation structure for an energy storage power station equipment compartment provided by this invention can significantly shorten the construction cycle and reduce construction costs. By standardizing the production of prefabricated components in a factory, on-site casting work is reduced, avoiding time-consuming processes such as traditional on-site casting formwork and curing, improving construction efficiency and quality stability, and reducing the difficulty of quality control. Furthermore, compared to traditional on-site cast-in-place foundations, this solution can reduce on-site material waste, avoid dust and noise pollution and construction waste accumulation, saving resources and being environmentally friendly.

The utility model discloses a split type down lamp outer cover and down lamp thereof, including the shell, the top of shell is disconnected and is connected with the lamp cover, and the inside of shell is provided with accommodating chamber, and the lamp cover is used for sealing the top of shell, and the disconnection and connection is convenient for dismounting and transportation, and the accommodating chamber and the shell are integrally formed and convenient for installing the lamp, the utility model discloses through the split type structure design of upper outer cover and lower outer cover makes each part can produce alone, flexible assembly, and the split direct stamping can, and the split can be fitted together, and the occupied space is reduced greatly, and the packing and the logistics cost in the transportation process are reduced, guaranteeing the light output symmetry through the central arrangement of LED board lamp pearl, and the light cup of inner wall is handled through high reflection, and the scattered light of lamp pearl is gathered effectively, and the light utilization rate is improved, the quick fixing of down lamp is realized through the elastic deformation of lamp decoration spring clamp, and the top is sealed through the lamp cover, and the impurities such as dust, water vapor are blocked.

The utility model discloses a combined shoe cabinet. The combined shoe cabinet comprises at least two independent combined cabinets, namely a first combined cabinet and a second combined cabinet, the first combined cabinet and the second combined cabinet are detachably connected through a connecting component; both the first combined cabinet and the second combined cabinet are provided with split cabinet doors; according to the utility model, the shoe cabinet can be flexibly assembled and quickly disassembled, tools are not needed, and the shoe cabinet can be stacked up and down; by arranging a dual-purification mechanism, efficient deodorization and dehumidification are achieved, the humidity in the shoe cabinet can be controlled to be relative humidity through cooperation of the dual-purification mechanism and the deodorization and dehumidification mechanism, and mould growth is effectively restrained; no partition plate and other structures are arranged inside, only the surface of the cabinet body needs to be wiped, and the maintenance cost is reduced.

A modular adjustable fixing device for an underwater acoustic transducer array includes a main support rod, a central structural component, a transducer fixing ring, and a sliding connector. One end of the main support rod is fixedly connected to the interior of the central structural component through three sets of square holes. The other end extends to form a Y-shaped array frame. The extended end of the main support rod is used to fix the transducer fixing ring, which is fixed to the main support rod by the sliding connector and suspended from the rear side of the central structural component. The sliding connector is slidably fitted onto the main support rod and positioned by fasteners, with its end connected to the transducer fixing ring. The central transducer fixing ring is fixed to the top of the central structural component. This invention allows for flexible adjustment of the baseline length of the underwater acoustic transducer array by adjusting the position of the sliding connector, meeting the acoustic testing requirements of different array models. Furthermore, its modular design facilitates easy disassembly and is suitable for stable fixing of transducer arrays in complex aquatic environments.

The utility model provides a team garden plot unit, a team garden plot is formed in the team garden plot unit, the team garden plot unit comprises a plurality of wall bodies, the plurality of wall bodies are connected end to end to form the team garden plot, and at least one wall body is provided with a display board frame; the top plate assembly is located at the top of the team garden plot unit, and the peripheral side of the top plate assembly is connected with the multiple walls; the first display board is detachably connected with the display board frame; the number of the cabinet bodies is multiple, and the multiple cabinet bodies are arranged in the team garden plot unit in the circumferential direction of the team garden plot unit. According to the team garden plot unit, the modularized team garden plot is designed, so that the team garden plot unit has flexibility, standardization and multifunctionality, and the technical problem that the team garden plot unit in the prior art cannot meet the requirements of enterprise management and production is solved.

This utility model relates to the field of display stands, and discloses a surround display stand, including a central stand, a horizontal plate fixedly connected to the inner center of the central stand, a top stand on the top of the central stand, and side stands connected to the left and right sides of the central stand by limiting components. Each limiting component includes a retaining frame fixedly connected to the back of the side stands, with a limiting groove on the outer wall of the retaining frame. A limiting block is elastically connected to the inner wall of the central stand by a limiting spring, and a limiting rod is fixedly connected to the outer wall of the limiting block. The left and right sides of the central stand have retaining slots. In this utility model, the limiting components allow for flexible assembly and disassembly of the side stands and the central stand. Furthermore, the layered structure design of the central stand, side stands, and top stand allows for reasonable layout of products of different sizes and types, making full use of space for product display, greatly enhancing the richness and attractiveness of product displays, and meeting diverse display needs.

The invention discloses a modularized split type intelligent water surface monitoring and processing system and method. Comprising a mobile monitoring unit, a control center and a processing unit, the mobile monitoring unit is used for carrying out hydrological monitoring on a predetermined water area in real time and transmitting the monitoring combination back to the control center; the mobile processing unit is used for receiving the control signal to maintain a predetermined water area; and the control center is used for outputting a control signal according to a monitoring result of the mobile monitoring unit to control the appointed processing unit to go to a preset water area for processing. According to the invention, through the split and modular design of the sensor and the processing equipment, configuration as required and flexible assembly are realized. The same set of system infrastructure can be quickly adapted to multiple scenes such as lake blue-green algae emergency treatment, channel oil stain cleaning, park garbage salvage, wetland water quality dynamic monitoring, drowning personnel rescue and the like by replacing different sensors and processing modules, and the application range of the system is greatly expanded.

The invention discloses a telescopic clamping module of a gamepad and the gamepad, and aims to solve the problems that an existing telescopic gamepad integrated clamping structure is complex in mold opening, high in cost and poor in compatibility, and the whole gamepad needs to be scrapped after a clamping part is damaged. The telescopic clamping module comprises a fixed shell and a movable shell which can slide in a telescopic mode relatively, a reset spring is connected between the fixed shell and the movable shell, and fixed ends are arranged at one ends of the outer sides to be connected with a gamepad shell. The fixed shell and / or the movable shell are / is provided with a clamping part, an anti-sliding / anti-abrasion pad is arranged on the front face of the fixed shell, one anti-sliding / anti-abrasion pad is provided with a sliding channel / rail, and the other anti-sliding / anti-abrasion pad is slidably installed in a matched mode. The gamepad comprises a left gamepad, a right gamepad and the telescopic clamping module, and the fixed shell and the movable shell are fixed to the two gamepads respectively. The telescopic clamping function is independent into a module, the design of a handle shell is simplified, the mold opening cost is reduced, clamping is stable, assembling is flexible, a damaged module can be independently replaced, the situation that the whole handle is scrapped is avoided, and the handle is adaptive to a mobile phone or a tablet personal computer.

The utility model provides a kind of waste conveying device, it includes pedestal, chain and drive mechanism;Pedestal is provided with waste channel in, and pedestal includes multiple modules, module is provided with waste channel unit, multiple modules are sequentially arranged, and the waste channel unit of each module sequentially communicates and constitutes waste channel;Multiple modules are divided into the first module located in one end and the second module located in other end in, the driving sprocket is provided in the first module, the driven sprocket is provided in the second module, and the driving sprocket, driven sprocket are mutually spaced along the extension direction of waste channel;Chain is wound on driving sprocket, driven sprocket, and scraper is provided on chain, and scraper is located in waste channel;Drive mechanism is connected with driving sprocket, to drive driving sprocket rotation, to drive chain operation, to make scraper push waste in waste channel. Compared with prior art, the waste conveying device of the utility model adopts modularization design, and it is convenient for packaging, transportation.

The invention relates to the technical field of steel truss lifting, and discloses an integral lifting platform for a large-span steel truss, which comprises a steel truss main body and a lifting machine, the steel truss main body is placed on the lifting machine, and the lifting machine is driven by a main driving device to lift; a flexible assembling assembly and protection assemblies are arranged on the elevator, the flexible assembling assembly is arranged on the elevator, a limiting assembly is arranged on the flexible assembling assembly, the protection assemblies are arranged at the ends of the two sides of the flexible assembling assembly, and filter screen assemblies are installed on the protection assemblies. Through cooperation of flexible assembly and the protection assembly, the problem that existing equipment is poor in adjustability is solved, different lifting sets in the flexible assembly assembly are spliced through clamping protruding heads and sliding grooves, stable connection is achieved through cooperation of the limiting assembly, and the lifting sets can be increased or decreased according to the length of the steel truss; the height of the protection assembly is adjusted through hydraulic lifting of the side protection plate, the sliding hook drives the elastic net and the bearing net for covering protection, the elastic hole and the soft bag buffer falling impact, and flexible assembly and comprehensive protection are integrally achieved.

The utility model relates to a kind of reconfigurable mobile chassis of cabin inspection operation robot based on multi-modal perception, including multi-modal perception device, chassis inspection movement device and reconfigurable chassis device;The multi-modal perception device is used to realize the comprehensive mapping of cabin environment, obstacle detection and autonomous positioning;The chassis inspection movement device is used to ensure that robot slows down in moving and working process Bumping, realizes autonomous inspection operation;The reconfigurable chassis device is used to realize the structural quick adjustment of robot, function extension and environmental adaptation according to cabin space and task demand.This utility model is compact in overall structure, reconfigurable, and has high precision in sensing ability, good robustness in motion control, suitable for intelligent inspection operation in closed industrial scene such as cabin, with good engineering deployability and practical application value.

The application discloses a sealing mechanism and a cascade flow field measuring device, and the sealing mechanism comprises a shell, a sealing assembly and a roller assembly. The shell is used for being assembled on a cascade experiment table. The sealing assembly is arranged on the shell and is used for sealing a cascade measuring groove. The sealing assembly comprises a plurality of sealing plates which are sequentially rotationally connected. At least one sealing plate is used for arranging a probe structure. The roller assembly is provided with two roller assemblies. One roller assembly is arranged at one end of the sealing assembly, and the other roller assembly is arranged at the other end of the sealing assembly. Each roller assembly is used for winding or unwinding the sealing assembly to pull the sealing assembly to move. When the probe structure moves with the sealing assembly, the sealing assembly also seals the cascade measuring groove well. The embodiment of the application can reduce the air leakage problem of the cascade measuring groove and ensure the flow quality of the measured flow field and the measurement effect of the probe structure.

The application belongs to the technical field of batteries, and discloses a bottom plate assembly, a battery box and a battery device. The bottom plate assembly comprises a frame, a cold plate, a limiting piece and a reinforcing structure. The cold plate is connected to the frame. The limiting piece is arranged on one side of the cold plate and is configured to limit a battery pack or a battery monomer. The reinforcing structure is arranged on the other side of the cold plate. The reinforcing structure comprises a transverse reinforcing piece and a first longitudinal reinforcing piece. The transverse reinforcing piece is connected to the cold plate. The first longitudinal reinforcing piece is connected to the frame and abuts against the cold plate. The first longitudinal reinforcing piece is provided with a strip-shaped hole. A first connecting piece penetrates through the strip-shaped hole and is connected to the first longitudinal reinforcing piece, the cold plate and the limiting piece. The bottom plate assembly, the battery box and the battery device provided by the application have lighter weight and less welding consumables.

This utility model provides a button structure for an intelligent vehicle button, relating to the field of intelligent vehicle button technology. It includes a base with a top cover mounted on its top. An mounting base is installed inside the base, and a support block is fixed to the top of the mounting base. The button body is placed on the top of the support block. The top cover's outer wall engages with the base's inner wall groove, and the button body's arc-shaped opening matches the top cover's arc-shaped block. The mounting base is fixed to the base with bolts and threaded sleeves, constructing a multi-level, multi-part connection and fixing system. This significantly improves the overall structural stability of the button, preventing component loosening or displacement during use, ensuring consistent pressing feel, extending product lifespan, and reducing the risk of malfunctions due to structural vibration. The design includes a precise matching structure between the bottom pressing block of the button body and the mounting base's trigger button. Simultaneously, a connecting column rotates within the support plate's locking hole, providing stable guidance and limiting for the button body's pressing action.

The utility model discloses a kind of car lamp shell buckling grabbing robots, including mechanical arm, suction cup, face shield clamp, shell clamp, buckling clamp, jig rack is installed on mechanical arm, jig rack is fixedly installed with mould table, suction cup is installed to mould table interior, face shield clamp installs several and is installed on the upper and lower surfaces of mould table, shell clamp installs several and is installed on the upper and lower surfaces of mould table, buckling clamp is set up several and is installed on the upper and lower surfaces of mould table;Mechanical arm controls suction cup to move to face shield surface, suction cup sucks face shield, second air cylinder controls clavus movement and blocks face shield, mechanical arm controls mould table to be close to shell and make it contact with face shield, fourth air cylinder pushes arc claw and tightens shell, realize face shield and shell's simultaneous grabbing, when needing to buckling shell and face shield, several buckling claws compress shell, realize shell and face shield buckling, using automatic mode to operate, effectively improve car lamp assembly and processing efficiency.

The application discloses a kind of cantilever formwork framework and its construction method for double-chamber hollow thin-walled high pier construction, comprising: triangular support frame, separable fixed connection assembly in high pier;Hoisting platform, fixed connection assembly is in the bottom end of triangular support frame;Construction platform, fixed connection assembly is in the top end of triangular support frame;Main back frame, including back sliding cross, back vertical frame and inclined strut;Back sliding cross can be positioned sliding assembly in the top end surface of construction platform;The bottom end of back vertical frame and the end of back sliding cross close to high pier are hingedly connected assembly;Inclined strut is fixed telescopic rod, and the end of inclined strut along its telescopic direction and the side end surface of back vertical frame away from high pier are connected assembly, the other end of inclined strut along its telescopic direction and the end of back sliding cross away from high pier are connected assembly;Formwork body, separable fixed connection is connected between back vertical frame.Solve the technical problems existing in the formwork system of prior art for mountain high pier construction.

The utility model relates to a table type wash basin (1) having: a bottom (10); a basin wall (20) extending from the bottom (10), the basin wall having a basin rim (30) lying in a plane (25); a drain opening (40) arranged in the bottom (20) and arranged eccentrically therein; and a placement surface (50) arranged on the bottom (10) for placing the table type wash basin (1) on a support plate, the placement surface (50) being oriented obliquely relative to the basin rim plane (25).

The utility model relates to the technical field of power supply cabinets, in particular to an assembled direct-current power supply cabinet, which comprises a frame, the front, back, left and right surfaces of the frame are hollow structures, the front surface of the frame is hinged with a box door through a door hinge, the opening and closing positions of the box door and the frame are opened and closed through a handle lock, and side plates are respectively arranged on two sides of the frame. Alignment blocks are symmetrically distributed on the inward sides of the side plates in the vertical direction. According to the scheme, the side plates are rapidly positioned through insertion connection of the alignment blocks and the alignment grooves, fixing is completed through cooperation of the clamping pins driven by the springs and the pin holes, mounting or dismounting can be completed without additional tools, the dustproof net is fixed to the back plate frame through clamping connection of the regular hexagon elastic clamps and the clamping grooves, the rubber material gives consideration to stability and convenience, and the structure is simple. The base and the frame are locked through the threaded column and the threaded sleeve of the built-in sleeve, flexible assembly is achieved, the maintenance efficiency is remarkably improved through the design, local replacement or cleaning is facilitated, and the operation and maintenance cost is reduced.

The utility model relates to the technical field of scrubbers, in particular to a scrubber with a dust collection switching structure, which comprises a main body, the main body comprises an industrial scrubber, a dirt suction pipe is movably connected in the industrial scrubber, a dust collection component is inserted into one end, far away from the industrial scrubber, of the dirt suction pipe, and the dust collection component comprises a first connecting pipe; a filter box is fixedly installed at the end, away from the dirt suction pipe, of the first connecting pipe, an adapter pipe is movably installed at the end, away from the dirt suction pipe, of the dust suction assembly, and a dust collector suction head is movably installed at the end, away from the dust suction assembly, of the adapter pipe. The dirt suction pipe is movably connected into the air suction pipeline in the industrial scrubber, the scrubber does not need to be modified, a new structure is directly added, the function of a traditional scrubber is expanded, meanwhile, the dust collector suction head is movably inserted into the adapter pipe, a worker can replace dust collector suction heads with different functions according to use scenes, and the use efficiency is improved. And the product applicability is improved.

A bottom groove body of the composite material bottom groove is of a groove-shaped structure, the upper portion of the groove-shaped structure is open, the width of the groove-shaped structure is gradually reduced from top to bottom, and therefore the composite material bottom groove and a pedal which are easy to stack can be stacked in the transportation process. Therefore, the space of the cargo compartment can be fully utilized, the transportation cost is greatly reduced, meanwhile, the composite material bottom groove and the pedal which are stacked into a pile and are easy to stack can be directly stacked in the cargo compartment, a special goods shelf does not need to be adopted, the transportation cost is further reduced, the loading and unloading processes are reduced, and the loading and unloading convenience is improved. The modularized buoys of the multifunctional floating body assembly are spliced into a platform structure or a latticed structure or an annular structure which is distributed in the horizontal direction through a plurality of connecting pieces, so that various overwater floating bodies such as an overwater platform, a floating valve and an aquaculture floating mat can be obtained through flexible splicing, and the multifunctional floating body assembly is good in universality, high in structural strength and good in weather resistance.

The utility model discloses a road transportation loading goods shelf which comprises N bottom plate assemblies, the number of the bottom plate assemblies is N, adjusting rods are welded to the front end and the rear end of an inner cavity of each bottom plate assembly, inverted-Y-shaped limiting blocks are connected to the tops of the adjusting rods in an inserted mode, and connecting holes are formed in the left side and the right side of each bottom plate assembly. The number of the vertical plate assemblies is N, and the vertical plate assemblies are detachably installed in the middle of the top of the bottom plate assembly through bolts; the number of the inclined plate assemblies is N, and the inclined plate assemblies are detachably installed at the left end and the right end of the front side and the rear side of the vertical plate assembly through bolts. By means of the detachable connection mode among the bottom plate assembly, the vertical plate assembly and the inclined plate assembly, when the loading goods shelf is not used, the loading goods shelf can be detached, storage is convenient, flexible assembly and length adjustment are carried out according to the size of goods, and practicability is improved.

This invention provides a Python-based automated diagnostic method and control system for space electric propulsion, relating to the field of space electric propulsion technology. The method includes: responding to an import operation of a Python function, displaying the imported Python function in the GUI of a host computer; responding to a configuration operation of preset variables, establishing a communication connection between the host computer and hardware instruments based on the preset variables, the hardware instruments including the space electric propulsion system to be diagnosed and its diagnostic equipment; responding to a configuration operation of a diagnostic script, adding the target Python function from the imported Python function to a specified location in the GUI, and having the GUI run to generate an automated diagnostic script; and responding to a running operation of the automated diagnostic script, running the automated diagnostic script on the hardware instruments to obtain the diagnostic experimental results of the space electric propulsion system. This invention can significantly simplify the multi-condition performance diagnostic test process for electric thrusters.

The utility model discloses a split type pipette module and pipette equipment with quick mounting and dismounting structure, wherein the split type pipette module with quick mounting and dismounting structure comprises: a function sub module and a connecting sub module; at least two positioning and locking assemblies are arranged between the function sub module and the connecting sub module; the function sub module is detachably connected with the connecting sub module through the positioning and locking assemblies; the connecting sub module is provided with a connecting structure matched with a pipette equipment rack. The split type pipette module and pipette equipment with quick mounting and dismounting structure can realize quick positioning and installation and convenient dismounting between the function sub module and the connecting sub module.

The application discloses a modularly installed platform household elevator, which comprises a guide rail system configured to be erected in a building as a hoistway, the guide rail system constitutes an elevator moving frame, and a car mechanism is vertically and slidingly installed on one side of the guide rail system, a safety door is arranged on the car mechanism to ensure the safety of passengers; guardrails are symmetrically arranged on both sides of the guide rail system in a detachable mode, a positioning frame is fixedly arranged at a ceiling of the building, an electric driving system is installed on the positioning frame, the electric driving system is connected with the car mechanism to provide lifting power for the system, a wire bundling assembly is arranged at the connection position of the electric driving system and the car mechanism, and the wire bundling assembly is used for parallel fixing or dispersing traction ropes connected with the car mechanism in the electric driving system, so that the car mechanism is combined with ropes or multiple ropes for traction lifting.

This utility model provides a height-adjustable pipe support, relating to the field of pipe support technology. It includes: a pipe support component, a pressure cap at the upper end of the component, a pipe support base at the lower end of the component, snap-fit ​​components inserted into the left and right sides of the component, a driving block welded to the outer end of each snap-fit ​​component, an adjusting screw connected to the inner side of each driving block, the adjusting screws being symmetrically distributed at both ends of the pipe support component, the lower end of each adjusting screw contacting the upper surface of the pipe support base via a positioning block, a fixing plate welded to the upper surface of the pipe support base, and the fixing plate being connected to the positioning block through a fixing threaded rod. This utility model solves the problem in the prior art where the lifting assembly at the lower end of the pipe support itself has a certain height, resulting in limited application range and poor versatility.

This utility model relates to a medical power socket box, belonging to the technical field of power socket boxes. Specifically, it is a modular medical power socket box, including a first outer shell and a second outer shell, which are slidably connected. It also includes a socket body, a locking assembly, and a plug-in assembly. The socket body is disposed inside the first and second outer shells. The locking assembly includes a lock housing fixedly installed on one side of the top of the first outer shell. The plug-in assembly includes a plug block fixedly installed on one side of the socket body and the second outer shell. This utility model achieves the effect of ensuring socket functionality and improving practicality. It solves the problems of existing fixed structures that are difficult to adapt to the diverse needs of different medical locations for the number and location of sockets, affecting medical efficiency; exposed sockets are prone to dust and debris falling in, affecting the stability of electrical connections, leading to poor contact, and consequently causing equipment failure or affecting equipment performance.

The utility model relates to the technical field of terminal frames, and discloses a reconfigurable display equipment intelligent terminal conversion frame, which comprises a frame main body, a display and an OPS host, a plurality of signal lines are arranged on the surface of the OPS host, and the frame main body comprises an upper frame, a lower frame, a left frame and a right frame; all the frames of the frame main body are connected and fixed through fasteners, and the fasteners and the frame main body are fixed through bolts. The frame body is composed of the upper frame, the lower frame, the left frame and the right frame, a user can flexibly disassemble and assemble the frame according to the size of a displayer, meanwhile, the groove is formed in the front end of the frame and used for fixing an infrared touch frame or a glass plate attached with a touch film, and touch function integration is guaranteed; the problems that a traditional scheme is complex in structure and poor in compatibility are solved, the installation time is greatly shortened due to modular assembly, the reuse rate is increased, the cost is reduced, upgrading and maintenance are convenient due to the disassembling characteristic of the frame, and the multi-scene multi-functional platform is suitable for multiple scenes such as education and conferences.

This utility model discloses a load-bearing frame structure, including a base plate and two opposite and parallel side plates. The lower parts of the two side plates are connected by the base plate, and the upper parts are connected by several connectors to form a load-bearing frame structure. The connectors include a first connector and a second connector. The first connector includes two fuel tank support rods, which are arranged parallel to each other and perpendicularly connected to the side plates. The second connector includes two handle support rods, which are arranged parallel to each other between the two fuel tank support rods. This utility model has a simple structure, flexible assembly, and can reduce vibration and noise during use.