57results about How to "Effective friction" patented technology

The invention provides a method and device for processing revolving parts by high-speed jet injection electroforming. The method is characterized in that an electroforming core mould is partially buried in an electroforming groove which is filled with hard particles or is in direct contact with a plated negative pole surface through a friction piece, so that the defects of accumulated tumors, burrs and the like on a deposition surface can be effectively removed by the friction of the hard particles or the friction piece on an electroforming layer; and a computer is used for controlling a jet nozzle to scan along with a certain track and cooperates with the rotary motion of the electroforming core mould at the same time, so that the exposed electroforming core mould surface is subjected to selective scanning electroforming so as to pile up the required parts layer by layer. The device of the invention mainly comprises a table movement mechanism, a negative pole rotation drive device, a control system, a temperature control device, an electroforming liquid circulating filter system and the like. The method and device for processing the revolving parts by high-speed jet injection electroforming of the invention are adopted, thus not only effectively removing the defects of hard spots, air holes, accumulated tumors and the like on the electroforming layer surface and manufacturing the electroforming layer with compact and even texture at higher deposition speed, but also abandoning the complicated negative pole female die of the traditional electroforming and rapidly and efficiently forming the revolving parts with different shapes and wall thicknesses by one step.

The present invention relates to a yaw stability control system for a vehicle equipped with electric power assisted steering and a method of controlling it. The system comprises: means (10) for determining the occurrence of understeer; means for determining the degree of understeer after the occurrence of understeer is determined; means (20) for determining if the determined degree of understeer exceeds a threshold value; means (30) for saving the steering wheel torque value and steering wheel angle value when determined that a calculated drop in steering wheel torque (8) exceeds the thresholdvalue; means for calculating a delta steering wheel torque (3), delta steering wheel angle (9) and updating the steering wheel angle (6) at the start of delta torque calculation; means for applying the calculated delta steering wheel torque (3) to the steering of the vehicle; means for calculating a driver intended steering wheel angle (5) and using it for controlling yaw stability control operations.

The invention discloses a pipeline robot walking device capable of being automatically adapted to diameters. A variable-diameter mechanism of the pipeline robot walking device is structurally characterized in that a lead screw driven by a variable-diameter motor is installed on the axis of a barrel body, a nut of a crisscross moving frame is matched with the lead screw in a screwed mode, the end of the crisscross moving frame extends out of the barrel body, parallelogram connecting rod assemblies are arranged on positions, corresponding to ends of the crisscross moving frame, outside the barrel body, one end of each parallelogram connecting rod assembly is hinged to the barrel body, and variable-diameter elastic supporting rods are hinged to the ends of the parallelogram connecting rod assemblies and the ends of the crisscross moving frame respectively. A walking mechanism of the pipeline robot walking device is structurally characterized in that wheel cages are arranged corresponding to the parallelogram connecting rod assemblies respectively and are hinged to the other ends of the parallelogram connecting rod assemblies, a plurality of walking wheel assemblies are installed on walking wheel frames, the walking wheel frames elastically stretch out of the wheel cages in the radial direction, and guide wheel assemblies are arranged at the two ends of the walking wheel assemblies respectively. The pipeline robot walking device can walk in a square pipeline as well as a circular pipeline, can successfully pass through corners of the pipelines and can be used for welding, installing, detecting and maintaining the pipelines and carrying out other operations after being additionally provided with relevant auxiliary tools.

The invention discloses a spore bulge imitating type filter plate for filtering a gas suspended solid, and belongs to the field of gas filtration. The spore bulge imitating type filter plate for filtering the gas suspended solid is characterized in that a spore type filter bag is arranged, and deforms under the impact of a gas to generate a bumping phenomenon, so the gas filtering and accommodating space is increased, and the filtration effect is improved; a power-assisted gas inlet ball rotates to a certain extent under the action of a wind shielding block, so the gas flow speed in the sporetype filter bag is increased, and the gas filtering effect is improved; a two-way mutual-alignment mechanism is arranged to generate the double air filtering effect under the action of an inner arc surface filter screen and bipolar filter bristles, and rubbing of the outer end of the spore type filter bag and friction and collision between a forward-pushing air filtering layer and a semi-flexiblebrush layer in the air filtering stopping process make suspended matters adhering to the forward-pushing air filtering layer and the semi-flexible brush layer effectively fall into an elastic matter collecting bag in a centralized mode, so suspended matter cleaning can be completed without disassembling, the cleaning difficulty is lowered, and the gas filtering efficiency is improved.

The invention relates to a device for supporting, stacking and conveying articles to be fired, particularly when firing ceramic products, which comprises an arrangement consisting of supports (3) and of support girders, such as supporting beams (6) and transversal beams on which, in particular, one or more supports are provided for placing the articles to be fired upon them. At least one movable bearing is provided for supporting at least one support girders (6) and has a supporting body (13) that is arranged so that it can be displaced, in essence, in the direction of the support girder (6).

The invention discloses a locknut and particularly relates to a locknut used for being connected with a metal plate. The locknut comprises a nut body with internal threads, wherein an annular conical boss is arranged at the top end of the nut body along the periphery of a thread hole; the length of the annular conical boss along the axial direction of the thread hole is 0.8-4 times the thread pitch of the internal threads; a plurality of projection welding stations are arranged at the bottom end of the nut body along the periphery of the thread hole and are used for being welded with the metal plate; the projection welding stations are equidistantly distributed on a concentric circle of the thread hole; and the distance between each projection welding station and the center of the concentric circle is not smaller than the maximum radius of the annular conical boss and is not greater than twice the maximum radius of the annular conical boss. According to the locknut disclosed by the invention, the effective friction forces of the threads are always kept between the metal plate and the nut and a bolt in the vibration process, and the aim of locking is achieved.

The invention discloses a magnetic suspension wheel. The magnetic suspension wheel comprises a suspension supporting shell and a spherical wheel body; the spherical wheel body is arranged in the suspension supporting shell; suspension supporting magnets are mounted in the suspension supporting shell; the spherical wheel body comprises a spherical wheel surface and an inner sphere; the inner sphere is in the spherical wheel surface; rolling balls which are distributed uniformly are arranged between the spherical wheel surface and the inner sphere; suspension orientating magnets are arranged in the radial direction of the inner sphere; the outward magnetic poles of the suspension orientating magnets are opposite to the inward magnetic poles of the suspension supporting magnets, so that the suspension supporting shell and the inner sphere generate repulsive force.

The invention discloses a climbing machine vehicle which comprises a vehicle body, wherein the vehicle body is provided with wheels; the end, facing a wall surface, of the vehicle body is connected and fixed with an adsorption mechanism; the adsorption mechanism comprises a shell; a cavity with a circular cross section is formed in the shell; the cavity is provided with a closed end surface and an open end surface; the open end surface forms an end surface for adsorbing the wall surface; the closed end surface is fixedly arranged at the end, facing the wall surface, of the vehicle body; a rotating power source is installed on the end, opposite to the wall surface, of the vehicle body; blades arranged in the cavity are connected with an output shaft of the rotating power source; the closed end surface is in an airtight state; the blades are linearly distributed along the axis of the cavity; and a soft flexible sealing structure is arranged between the outer edge of the open end surface and the wall surface. According to the invention, fluff strips are arranged between the outer edge of the adsorption mechanism and the wall surface to form flow resistance which can prevent the outside air from back flowing into the cavity of the adsorption mechanism, thereby eliminating the influence of back flow to the rotating flow in the cavity.

An underground coal mine disaster information detection robot platform comprises a track platform and a walking mechanism which is arranged on the track platform in a sliding mode. The walking mechanism is provided with an information detection robot. The track platform is provided with at least two supporting cross rods. One supporting cross rod is provided with a fixing support and the other supporting cross rod is provided with a telescopic support. An experiment platform which uses the track platform as a framework is constructed. The underground coal mine disaster information detection robot platform is compact in structure, flexible, small in size, easy to operate, high in intelligence, and capable of enabling the information detection robot to rapidly accurately reach the place nearest to a disaster site and enabling the information detection robot to move forward and backward and suspend in order to conduct information detection and a search-and-rescue operation. The inclination of the track platform can be adjusted through the telescopic support in order to conduct the experiment on gradeability of the information detection robot.

The invention discloses a simulation skiing machine with an emergency braking function and an application method thereof. The simulation skiing machine comprises a protective fence, a first assistingrod and a second assisting rod, wherein the first assisting rod and the second assisting rod are installed at the top of the protective fence in parallel, a walking channel is arranged on the inner side of the protective fence, a first snow blanket and a second snow blanket are arranged on the inner side of the walking channel in parallel, and a first variable frequency motor and a second variablefrequency motor are symmetrically arranged on the outer side, close to one end, of the protective fence. According to the simulation skiing machine with the emergency braking function and the application method thereof, the two groups of snow blankets are independently arranged, and students of different periods conduct training of different degrees; the two groups of the variable frequency motors are remotely controlled to change the rotating speeds of the two groups of snow blankets respectively, it is promoted that the students adapt to training of different speeds gradually, the trainingefficiency of the students is improved, emergency braking of the skiing machine can be completed, the students are prevented from tumbling accidentally to cause injuring, the safety is high, the stability in braking is good, irregular movement of the students can be conveniently corrected, and the training effect of the students is greatly improved.

The invention discloses a hardware tool transfer device adopting a friction stir technology, which comprises a bottom plate. Wheels are fixedly connected to the four corners of the lower surface of the bottom plate; a pushing device is fixedly connected to the upper surface of the bottom plate; the upper surface of the bottom plate is fixedly connected with the lower surface of a box body; and a second bearing is clamped on the upper surface of the inner wall of the box body. According to the hardware tool transfer device adopting the friction stir technology, through arranging a second motor,a threaded post, a threaded cap, support plates, connecting rods, the bottom plate, the wheels, a non-slip pad, a shock pad, a rubber pad and a second rotating shaft, the rubber pad drives the shockpad and the non-slip pad to move upwards, to make the non-slip pad keep away from ground, a worker can push a horizontal pole to drive the bottom plate to move, the hardware tool does not need to be moved by several workers, thus the work strength of workers is alleviated, and the work efficiency is improved.

The invention relates to a protection system of a turbine compressor, and belongs to the technical field of electromechanical equipment control. According to the protection system, a monitoring device, a cooling device, a filtering device and a lubricating device are arranged, so that a turbine compressor body is protected in a targeted mode, and the turbine compressor body stably works by the temperature, the flow and the pressure monitoring; and meanwhile, impurities in lubricating oil and air are effectively prevented from being worn by a compressor unit, so that the purpose of protecting the turbine compressor is achieved, and the requirements of actual electromechanical equipment are met. The protection system is simple in structure, convenient to operate and high in controllability.

The invention relates to the technical field of paperboard production and processing, particularly to a paperboard processing scrap collecting device. The paperboard processing scrap collecting devicecomprises a processing box, and a plurality of friction bars are vertically arranged inside the processing box and can generate electricity by friction with the side walls of the processing box; thetop ends of the friction bars are rotatingly connected with water inlet pipes, the side walls of the water inlet pipes are provided with a plurality of water outlets, a water tank is arranged above the water inlet pipes, the bottom of the water tank is communicated with a plurality of water outlet pipes, and first hoses are communicated between the water outlet pipes and the water inlet pipes; thebottom ends of the friction bars are connected with hollow rotating shafts which are provided with second gears in a sleeve mode, and the second gears are engaged with a second rack; a second pistonis slidingly arranged inside the processing box and connected with a third rack which is engaged with a third gear, a transmission member is connected between the third gear and a first gear, and thethird gear is connected with the rotating shafts. The paperboard processing scrap collecting device solves the problem of environmental pollution caused by scattered scraps in the prior art.

The invention provides a nano wear reducing additive preparation formula, which is especially used for the wear reducing additive for automobile engine lubricating oil. The nano wear reducing additive is prepared by uniformly stirring 23-43% of nano carbon particles, 12-26% of nano molybdenum disulfide, 28-39% of polytetrafluoroethylene, 5-9% of isopropanol and a proper amount of anti-grinding agent. The nano wear reducing additive is capable of effectively reducing pressure and reducing resistance, the employed nano carbon particles and nano molybdenum disulfide have absolutely effective friction effect, lubricating oil state is stable, optimum lubrication effect can be reached, and oil-way obstruction is difficultly generated.

The invention discloses efficient cleaning equipment of an environment-friendly waste container and relates to the technical field of environment-friendly equipment. The efficient cleaning equipment comprises a driving mechanism and a cleaning device. The waste container is detachably connected to the driving mechanism. The driving mechanism comprises a first driving motor and a second driving motor. The power output end of the second driving motor is connected with a lead screw. A linkage block sleeves the lead screw. A second electric telescopic rod is arranged at the bottom of the linkage block. The power telescopic end of the second electric telescopic rod is connected with the first driving motor. The cleaning device comprises a cleaning room. The second driving motor and the lead screw are arranged at the top of the cleaning room. A movable rod penetrates through the cleaning room. A U-shaped brush body is mounted at one end of the movable rod. A driving device is arranged at theother end of the movable rod. A spraying device and a drying device are arranged on the brush body. The cleaning equipment provided by the invention has the advantages of good cleaning effect and high efficiency and is environmentally friendly and sanitary.

The invention discloses a friction pendulum array shock insulation layer with overall consistency of the curvature of slide grooves, relates to a shock insulation layer, in particular to a friction pendulum array shock insulation layer with overall consistency of the curvature of slide grooves, and belongs to the field of building. The friction pendulum array shock insulation layer solves the problem that the shock insulation effect of a traditional shock insulation structure is poor and comprises a plurality of integrated friction pendulum shock insulation supports, wherein the integrated friction pendulum shock insulation supports are uniformly distributed in a circular form, each integrated friction pendulum shock insulation support comprises a support slide groove and a support slide plate, the support slide plates are installed on support slide groove slide faces of the support slide grooves, and the support slide groove slide faces of the support slide grooves of the integrated friction pendulum shock insulation supports are located on the same curvature virtual faces.

The invention discloses water conservancy engineering food grade steel wire rope surface lubricating grease comprising the following raw materials: 85-94% of base oil, 6-15% of a thickener and anti rust agent with the weight of 0.5-20% of the total weight of the base oil and the thickener; the base oil comprises food grade mineral oil, synthetic oil or mixed oil of the food grade mineral oil and the synthetic oil, the 100 DEG C kinematic viscosity of the base oil is 10-100mm<2> / s; the thickener comprises C16-C20 long-chain fatty acids, aromatic acids and organic aluminum compounds in the molar ratio of 1:1-1.7:1-1.2. The water conservancy engineering food grade steel wire rope surface lubricating grease meets the health and safety standards of drinking water industry, may not cause pollution of drinking water sources, has good water resistance, does not decompose in the water, has less oil bloom and good antirust property, and can effectively protect the surface of a steel wire rope.

The invention discloses adhesive removing liquid for plastic bottles. The adhesive removing liquid is prepared by taking modified rice bran and microcrystalline cellulose as main raw materials and matching with melamine, activated carbon, triglyceride, octyldodecanol and other aids. The adhesive removing liquid is convenient to use, adhesives attached to the bottles can be effectively removed by rinsing recycled plastics once by the adhesive removing liquid, and the adhesive removing liquid attached to the bottles can be completely removed by rinsing with water once only subsequently. The adhesive removing liquid is non-toxic, harmless and high in using safety, and application of plastic particles after plastic recycling is not influenced. Moreover, the wastewater obtained after cleaning can be discharged by virtue of simple sedimentation and filtration, and environmental pollution is alleviated.

A micro- and nano-hot embossing method for an optical glass lens array, including: preparing a mold with a micro-hole array by micro EDM, where the micro-hole array matches an optical glass lens array and the mold is made of a hard metal material which is conductive and meets strength and temperature requirements; preparing a nano nitride-based graded composite coating on a surface of the mold by magnetron sputtering; and pre-fabricating a glass preform and then placing the glass preform on the surface of the mold; heating the glass preform and hot embossing by a glass molding machine in vacuum; cooling in nitrogen atmosphere; and demolding to produce the optical glass lens array. The micro- and nano-hot embossing method of the present invention improves the surface quality of the optical glass lens array and reduces the cost and difficulty for manufacturing.

The invention discloses an aluminium alloy template used for a variable cross-section of a wall column and a design method of the aluminium alloy template, and relates to the field of construction methods of aluminium alloy templates for project construction. The aluminium alloy template used for the variable cross-section of the wall column comprises a broadbrimmed aluminium alloy template and anarrow-edge aluminium alloy template, the broadbrimmed aluminium alloy template and the narrow-edge aluminium alloy template are provided with template connecting pin holes, and bolts penetrate through the template connecting pin holes; the bolts are connected with nuts, and the broadbrimmed aluminium alloy template and the narrow-edge aluminium alloy template are spliced through the bolts; the broadbrimmed aluminium alloy template and the narrow-edge aluminium alloy template further comprise crossed strengthened frames, oblique supporting devices and friction supporting devices, the broadbrimmed aluminium alloy template and the narrow-edge aluminium alloy template are connected with the crossed strengthened frames, and upper sliding openings are formed in the crossed strengthened frames;the oblique supporting devices are installed at the upper sliding openings and connected with the friction supporting devices. The design method of the aluminium alloy template used for the variable cross-section of the wall column is combined to adapt to cross section transformation of all building wall columns, standard batch production is achieved, the manufacturing cost of the aluminium alloytemplate is low, and the work efficiency is effectively improved.

The invention provides a heavy-loaded stepless speed changer. The heavy-loaded stepless speed changer comprises a shell, an end cover, a driving shaft, a driving bevel gear, a driven shaft, a driven bevel gear, a speed regulating device, transmission wheels, a rotating disc and an output shaft; the driving shaft is in drive connection with the driving bevel gear, the driving shaft penetrates through the center of the speed regulating device to be arranged, the driven shaft is arranged on the lower portion of the speed regulating device, the driven bevel gear is fixed on the driven shaft, and the driven bevel gear is meshed with the driving bevel gear for transmission; each transmission wheel is in transmission connection with a transmission key of the driven shaft in a sliding mode in the axial direction, the rotating disc is arranged under the transmission wheels, and the surface of the rotating disc makes contact with the surfaces of the transmission wheels; the output shaft is fixedly connected with the rotating disc, the shell is arranged outside in a covering mode, a fist shaft hole is formed in the bottom of the shell, and the output shaft penetrates out of the shell through the first shaft hole; the end cover is installed at the top of the shell and tightly presses all parts in the axial direction, a second shaft hole is formed in the center of the end cover, and the driving shaft penetrates out of the end cover through the second shaft hole. The heavy-loaded stepless speed changer achieves heavy-loaded stepless speed changing transmission.

The invention discloses a wheelchair with an electric power assisting device. The wheelchair includes a seat, a left wheel, a right wheel, an energy storage battery device and two sets of electric power assisting devices. The left wheel is connected with the right wheel through an axle, the seat is connected with the axle, the position of a hub of the left wheel is connected with a first hand wheel, the position of a hub of the right wheel is connected with a second hand wheel, the two sets of electric power assisting devices are connected to the left and right side edges of the seat through first supports, and the energy storage battery device is connected into the seat and connected with the electric power assisting device through cables. The wheelchair has the advantages that at ordinary times, a user drives the wheelchair manually through walking wheels, so that the arms of the user can be exercised; when the electric assisting is needed, a swinging plate is swung to make a friction wheel be in contact with the walking wheels, and the state is locked through a locking mechanism, so that a walking motor can drive the walking wheels through the friction wheel to perform electricpower assisting driving. The energy storage battery device is fixedly arranged inside a vehicle frame of the wheelchair and facilitates dismantling.

The invention discloses a pipeline robot walking device capable of being automatically adapted to diameters. A variable-diameter mechanism of the pipeline robot walking device is structurally characterized in that a lead screw driven by a variable-diameter motor is installed on the axis of a barrel body, a nut of a crisscross moving frame is matched with the lead screw in a screwed mode, the end of the crisscross moving frame extends out of the barrel body, parallelogram connecting rod assemblies are arranged on positions, corresponding to ends of the crisscross moving frame, outside the barrel body, one end of each parallelogram connecting rod assembly is hinged to the barrel body, and variable-diameter elastic supporting rods are hinged to the ends of the parallelogram connecting rod assemblies and the ends of the crisscross moving frame respectively. A walking mechanism of the pipeline robot walking device is structurally characterized in that wheel cages are arranged corresponding to the parallelogram connecting rod assemblies respectively and are hinged to the other ends of the parallelogram connecting rod assemblies, a plurality of walking wheel assemblies are installed on walking wheel frames, the walking wheel frames elastically stretch out of the wheel cages in the radial direction, and guide wheel assemblies are arranged at the two ends of the walking wheel assemblies respectively. The pipeline robot walking device can walk in a square pipeline as well as a circular pipeline, can successfully pass through corners of the pipelines and can be used for welding, installing, detecting and maintaining the pipelines and carrying out other operations after being additionally provided with relevant auxiliary tools.

The invention discloses a kit for intestinal microbial flora detection. The kit comprises a shell; the shell is hinged with an upper cover; a fixed groove is formed in the shell; an upper support frame and a lower support frame are arranged in the shell; the upper support frame is provided with a first fixed hole; the lower support frame is provided with a second fixed hole; centrifugal tubes penetrate in the first fixed hole and the second fixed hole; an extension column is arranged between the upper support frame and the lower support frame; a spring is sleeved on the extension column; a clamping device is arranged in the second fixed hole; the clamping device is clamped with the centrifugal tubes; the centrifugal tubes comprise tube bodies; the tube bodies are fixedly connected with clamping blocks; foldable funnels are sleeved on the tube bodies; the foldable funnels are matched with the clamping blocks; the clamping blocks are fixedly linked with handhold blocks; the tube bodies are provided with external threads; and the tube bodies are in threaded connection with cover bodies through external threads. The kit has the advantages of convenient sampling, better stability, prevention of tilting of the centrifugal tubes and prevention of cross infection.

The plastic fan coil comprises a filtering mechanism, the filtering mechanism comprises a bottom frame and a cleaning part, first sliding grooves are formed in the inner surface walls of the two sides of the bottom frame, a top frame is slidably embedded between the interiors of the two first sliding grooves, second sliding grooves are formed in the inner surface walls of the two sides of the bottom frame, and a cushion frame is slidably embedded between the interiors of the two second sliding grooves; a mounting frame is fixedly connected between the opposite outer surfaces of the top frame and the cushion frame. During use, a fan is controlled to be started, so that external air can be effectively sucked into the bottom frame through a filter screen, and meanwhile, a rotating motor is controlled to be started in a timing manner, so that the rotating motor can effectively drive a corresponding supporting shaft to rotate through a bevel gear; furthermore, the supporting shafts can effectively drive the corresponding supporting rollers to rotate, and the rotating supporting rollers can effectively rotate to adjust the use surface of the filter screen.

The invention relates to a transition roller cleaning device used in a float glass slag box and a cleaning method thereof. The transition roller cleaning device comprises a graphite strip, the graphite strip is detachably arranged on a graphite strip fixing seat, and the bottom of the graphite strip fixing seat is provided with an elastic device. Effective friction between the graphite strip and the transition roller can be guaranteed, the height of the graphite strip does not need to be adjusted frequently, labor force is saved, and the cleaning efficiency is improved.

The invention discloses an anti-slip cable saddle structure for suspension bridges. The anti-slip cable saddle structure comprises a saddle. The bottom of a trough of the saddle is provided with at least one longitudinal partition parallel to trough walls. At least one discontinuous clamp plate layer is arranged between each two adjacent longitudinal partitions or between each longitudinal partition and the corresponding trough wall. Each discontinuous clamp plate layer is formed by linking at least four tangential clamp plates in the longitudinal direction. Besides the bottom of the trough and the sidewalls all providing effective friction, the added tangential clamp plates and longitudinal partitions provide effective friction, so that slip resistance is greatly improved; slipping between a main cable and the trough can be prevented; an effective solution is provided for cable saddle structures of small side- and middle-span ratio suspension bridges or multi-pylon multi-span suspension bridges, and overall rigidity, wind resistance and bearing capacity of the bridges are improved.

The invention provides a hand wash bucket comprising an open bucket body and a base. An inner cavity of the open bucket body is provided with a rotating surface having larger top and smaller bottom. The inner wall of the open bucket body is provided with evenly distributed projections which are cylindrical. The head of each cylinder is provided with symmetric arc faces. The cylinders are 10+ / -5mm in diameter D; spacing s of the adjacent projections is 7.5+ / -2.5mm; the projections are 10+ / -5mm in height. The cross section of the inner cavity of the open bucket body is an oblong, 330+ / -70mm in short diameter L2, long diameter L1 is L2+b, and b is 25+ / -5mm. The spherical head of each projection is provided with small projections or an uneven face. One side of an opening of the open bucket body is provided with an inward edge allowing less water to splash out of the bucket. The projections are perpendicular to the inner wall, with the projections, of the bucket. The bucket body is in an arc shape having larger top and smaller bottom in the vertical direction; a groove network forms among the projections on the inner wall of the bucket; clothes can be effectively rubbed in all moving directions along the wall of the bucket, and the clothes can be washed more efficiently.