230results about How to "Avoid squeezing" patented technology

The invention discloses an aeroacoustic wind tunnel corner noise elimination flow deflector, a flow deflector group and a design method, and belongs to the technical field of aeroacoustic wind tunnel test equipment. The corner flow deflector aims at solving the technical problems that an existing corner flow deflector cannot give consideration to aerodynamic performance and noise elimination performance, and a special shape design method and a combination application scheme are lacked. The noise elimination flow deflector is of an integrated structure formed by sequentially connecting a semi-oval front edge, a front straight section, an arc section, a rear straight section and a wedge-shaped tail edge, and key parameters of the upper profile and the lower profile are designed in an associated mode. The flow deflector set is formed by combining and installing at least two noise elimination flow deflectors according to a specific rule, and a uniform-section airflow channel is formed. According to the design method, coupling optimization of the noise elimination amount and the aerodynamic performance is achieved through a parameterized design process in combination with the Picrov formula, and the design method has the advantages of being high in noise elimination efficiency, small in aerodynamic loss and good in airflow uniformity, is suitable for a symmetric corner aerodynamic acoustic wind tunnel and can be widely applied to aerodynamic noise tests in the fields of aviation, automobiles and the like.

The invention relates to the technical field of feed production, in particular to an intelligent quality detection machine for feed production, which comprises a mounting frame and a housing, a housing is fixedly connected to the mounting frame; a rectangular groove I is formed in the mounting frame; a second rectangular groove is formed in the housing, and the first rectangular groove coincides with the second rectangular groove. The device further comprises a power assembly, a U-shaped frame, a roller, a sealing plate and the like. A power assembly is connected in the housing; the power assembly is connected with a U-shaped frame; a roller is rotationally connected to the U-shaped frame; a sealing plate is rotationally connected to the roller through a rotating shaft. According to the intelligent quality detection machine for feed production obtained through the design, the feed rolls inside through rotation and swing of the roller, so that the hardness, brittleness and water content of the feed are detected, time consumption is low, efficiency is high, production line parameters are convenient to adjust in time, a large amount of unqualified feed is prevented from being produced on a production line, and resource waste is reduced.

The utility model relates to a torque fixing sleeve structure for a built-in motor of an electric power-assisted bicycle. The torque fixing sleeve structure comprises a center shaft, a torque sensor, a shell, a circlip for a shaft, a torque fixing sleeve and a fixing screw, the torque sensor is sleeved on the middle shaft, and the axial movement of the torque sensor is limited by the elastic retainer ring for the shaft; the torque sensor is sleeved with the torque fixing sleeve, four right positioning grooves and two left positioning grooves are formed in the two ends of the torque fixing sleeve respectively, and the right positioning grooves and the left positioning grooves are clamped with the inner wall of the shell. The torque fixing sleeve is fixed to the shell through a fixing screw, a wiring port and a wiring channel groove are formed in the torque fixing sleeve, and a sensor wiring harness penetrates through the wiring port and is contained in the wiring channel groove. The problems of high cost, complex structure and difficult maintenance are solved.

The utility model discloses a kind of dialysis pipeline fixing devices, it is related to medical instrument technical field.Dialysis pipeline fixing device, including box body, box cover, limiting component, clamping component.The first recess is opened in box body;The side of box cover is hinged with the side of box body, and the second recess is equipped on box cover;The box cover flip cover is equipped on the box body, and first recess and second recess are connected with each other to form installation channel;Limiting component is arranged on box body, and limiting component is used to limit the relative position of box cover when being covered on box body with box body;Clamping component is installed on box body;Dialysis pipeline fixing device provided by the utility model is connected by using limiting component to make box body and box cover cooperate, finally fixed in patient's clothes or bed sheet by using clamping component, when providing support for dialysis pipeline, it is more stable and reliable, while avoiding to cause misclip or lead to pipeline occlusion to dialysis pipeline, ensure the reliability of patient's hemodialysis treatment.

The utility model discloses a flat plate type chassis of an agricultural unmanned trolley, which belongs to the technical field of agricultural vehicle parts, aims at solving the problem that the loss rate of crops is increased due to the fact that the agricultural vehicle generates large vibration in the driving process, and comprises a chassis frame, and two front wheels are rotatably arranged at the bottom of the chassis frame close to the front end. Two rear wheels are rotatably mounted at the positions, close to the rear end, of the bottom of the chassis frame, the cushioning mechanisms, the transverse cushioning springs and the longitudinal cushioning springs are matched, under the action of the pipe sleeves and the damping rods, vibration borne by the box body can be buffered, the situation that the vibration is transmitted into the storage box from the chassis can be effectively reduced, and the storage box is convenient to use. By means of the technical scheme, the vehicle can run more stably, the stability and safety of crops in the transportation process are improved, the crops can be prevented from being excessively squeezed, collided and damaged in the transportation process, and especially for easily-damaged fruits and vegetables, the shape and quality of the fruits and the vegetables can be kept, and the loss rate is reduced.

The utility model discloses a kind of storage devices for cranberry processing, belong to cranberry processing technical field, to solve the existing technology aims at solving the traditional cranberry storage mode of existing technology usually is to directly stack the fruit after picking on the ground of warehouse or simple container, large amount of accumulation can make between fruit mutual extrusion, affect the quality of whole batch cranberry Problem. Including storage box, baffle and locking mechanism, the upper surface of storage box is provided with feeding opening, the inside of storage box is arrayed with multiple groups of layer plates, multiple groups of layer plates divide the inside of storage box into multiple independent storage cavities, the sidewall of storage box is respectively provided with baffle corresponding multiple storage cavities. The storage device for cranberry processing, cranberry can be automatically stored in different storage cavities in layer, avoid the centralized extrusion of large amount of fruit, effectively maintain the integrity and freshness of cranberry, reduce juice loss and loss of nutrient composition.

This invention relates to the field of medical auxiliary instruments, and more particularly to a hemodialysis auxiliary device for nephrology. This invention provides a hemodialysis auxiliary device for nephrology that can stably support the patient's arm on the side of the fistula and provides movable fixation for the catheter connected to the fistula puncture needle. It is flexible in use and can effectively prevent muscle spasms in the arm, thus assisting the patient in undergoing more comfortable hemodialysis treatment. The hemodialysis auxiliary device for nephrology includes a base plate, a screw, and a rotating handle; the screw is threaded to the base plate, and the rotating handle is located at the bottom end of the screw. This invention uses a round-headed top rod to limit the inclined ring, locking the height of the support ring plate and the fixed ring plate. Simultaneously, a toothed ring limits the gear, locking the swing angle of the support ring plate and the fixed ring plate. This allows the support ring plate to limit the patient's arm on the side of the fistula, assisting the patient in undergoing stable hemodialysis treatment.

The utility model provides a wardrobe corner coat hanger, which relates to the technical field of coat hangers and comprises a corner mounting seat and a corner coat hanger body, an arc-shaped pipe is arranged between two sides of the front side of the corner coat hanger body, and a corner connecting pipe is arranged on the front side of the corner coat hanger body. The arc-shaped pipe, the corner connecting pipe, the hooks, the first fixed supporting pipe and the second fixed supporting pipe are arranged on the corner clothes hanger body, the arc-shaped pipe can be used for hanging clothes and the like, the hooks are arranged at the bottom of the corner connecting pipe and can be used for hanging articles such as hats and small bags, and the second fixed supporting pipe can be used for hanging scarves and the like. Area space of corners in the wardrobe is effectively utilized, space utilization rate is increased, storage neatness is enhanced, each article is provided with an exclusive hanging position, extrusion and deformation among clothes are avoided, and the inside of the wardrobe looks more attractive.

The utility model discloses a sounding unit, including basin stand, magnetic circuit system, conducting centering disk and a plurality of voice coil, magnetic circuit system is connected basin stand, magnetic circuit system includes yoke, and the central magnetic subassembly and first side magnetic structure that are respectively provided on yoke, central magnetic subassembly is located between at least one group of two oppositely arranged first side magnetic structure, the central magnetic assembly comprises a plurality of central magnetic structures which are arranged side by side, the yoke is provided with a window, two opposite side edges of the window are respectively connected with flanges, and the flanges are provided with openings; the voice coils and the central magnetic structures are arranged in a one-to-one correspondence manner, and partial areas of the voice coils are located between the central magnetic structures and the flanges; the conduction centering disk comprises an inner mounting part, a cantilever part and an outer mounting part which are connected in sequence, a partial area of the cantilever part corresponds to the window and is located between the two flanges, one end of the inner mounting part penetrates through the opening and is fixedly connected with the voice coil, and the outer mounting part is connected with the basin stand. The sound production unit has high performance.

The utility model belongs to the voice interaction technical field discloses a kind of voice interaction devices, it includes sound entry box, sound entry component, sound exit box and sound exit component.Sound entry box is equipped with bunching structure, sound entry component includes microphone, circuit board and first wire, microphone is set to sound entry box, microphone is electrically connected in circuit board by first wire, sound exit box and sound entry box are set in split type, sound exit component includes loudspeaker and second wire, loudspeaker is set to sound exit box, and it is electrically connected in circuit board by second wire, bunching structure is configured as at least part first wire and / or at least part second wire is limited in sound entry box.By the above setting, the voice interaction device of the application can effectively bind cable and reduce the signal interference between microphone and loudspeaker.

The utility model relates to the technical field of coal mine filling mining, in particular to a fast and movable waste rock blocking wall for filling waste rock behind a support, and mainly solves the technical problems that an existing waste rock blocking wall is poor in structural stability, time-consuming and labor-consuming to build and poor in flexibility. The fast and movable type waste rock blocking wall comprises a bottom plate used for being attached to the ground of a roadway; the wall body assembly comprises a fixed wall body and spliced wall bodies, the bottom of the fixed wall body is hinged to the bottom plate, a hinged shaft is arranged in the width direction of the bottom plate, the number of the spliced wall bodies is at least one, the spliced wall bodies are detachably fixed to the upper portion of the fixed wall body, and the fixed wall body and all the spliced wall bodies form a complete wall body used for blocking waste rock; the supporting assembly comprises a telescopic rod and a locking piece, the telescopic rod is perpendicular to the width direction of the bottom plate, one end of the telescopic rod is hinged to the bottom plate, the other end of the telescopic rod is hinged to the fixed wall, and the locking piece is used for locking the length of the telescopic rod. The device is high in structural stability, easy and rapid to build and high in flexibility.

The utility model provides a kind of fruit packing environment-friendly paper box, including box body and box cover, the box body includes bottom plate, the top of the bottom plate is fixedly connected with energy-absorbing cylinder, the energy-absorbing cylinder is hollow structure, the inboard of energy-absorbing cylinder is equipped with multiple elastic supports, the top of the elastic support is equipped with the containing groove for placing fruit, the sidewall of the elastic support is equipped with the air passage that is connected with the inside of the containing groove and is penetrated, the sidewall of the energy-absorbing cylinder is equipped with the air hole that is mutually matched with the air passage symmetrically.The utility model is through being equipped with energy-absorbing cylinder and elastic support, and the energy-absorbing cylinder of hollow structure can absorb external impact force by self deformation, and elastic support can further disperse impact force by elastic deformation, so as to avoid that fruit is directly squeezed and collided, greatly improves the buffering protection performance of box body, and each fruit is placed in independent containing groove, and also can avoid mutual collision between fruits due to transportation shaking.

The application discloses a comprehensive distribution box for smart grid, and relates to the technical field of distribution boxes.The comprehensive distribution box for smart grid comprises a main body, an adjusting assembly is clamped in the inner cavity of the main body, and the adjusting assembly is adjusted synchronously along with the wiring channel demand; a splicing assembly is assembled at the end of the adjusting assembly, and the splicing assembly is used for lengthening or width adjusting of the wiring channel.The comprehensive distribution box for smart grid can accurately adjust the width of the wiring channel according to actual demand through the adjusting mechanism, can ensure that the space can be fully utilized under various environments, and can avoid unnecessary waste; the size of the wiring channel can be accurately controlled by adjusting the end of the line, space waste can be avoided, and the wiring layout can be optimized; meanwhile, the end of the wiring channel is adjusted, the channel width can be quickly expanded or reduced according to the change of the load, and the comprehensive distribution box for smart grid is suitable for different scenes.

The invention discloses a novel clinical uterine curettage device for gynaecology and obstetrics, and relates to the technical field of uterine curettage devices, the novel clinical uterine curettage device for gynaecology and obstetrics comprises a handle, a length adjusting mechanism, an angle adjusting mechanism and a rotating mechanism are arranged on the inner side of the handle, a movable cylinder is arranged on the inner surface of the length adjusting mechanism, and a deformation mechanism is arranged at one end of the movable cylinder. According to the novel clinical uterine curettage device for the obstetrics and gynecology department, by arranging the deformation mechanism, the opening amplitude and shape of the deformable curettage ring can be precisely adjusted, the deformable curettage ring is made to adapt to the sizes and shape differences of uterine cavities of different patients, compared with a fixed arc-shaped structure, friction and extrusion generated when the curettage assembly enters the uterine cavity are reduced, the operation entering difficulty is lowered, and the pain feeling of the patients is reduced; the problems that most scraping assemblies of an existing clinically-used uterine curettage device are of a fixed-shape arc-shaped structure, the entering difficulty is increased, the operation time is prolonged, high pain can be brought to a patient, even complications such as uterine cavity mucosa injury can be possibly caused, and postoperative recovery of the patient is affected are solved.

The utility model relates to door closer technology field especially relates to a door closer improved structure, it mainly solved the problem of poor safety in use of door closer in the prior art, including outer tube and inner tube, the end of outer tube is equipped with first buffer device, is equipped with first spring in the inner tube, and the front end of inner tube is equipped with second buffer device, and second buffer device includes end cover, movable element and support assembly, movable element has screw thread area and buffer area, and support assembly includes piston and protective sleeve, and the central axis of piston is equipped with screw hole, and the upper end of elastic member is located on movable element and leans to the lower surface of piston, so that the lower end of screw thread area is in contact with the upper end of screw hole, when movable element rotates too much inwards, the both ends of first spring are connected with first buffer device and support assembly respectively, so that the upper end of screw thread area is in contact with the lower end of screw hole.

The invention relates to an energy storage device and a power utilization system. The energy storage device comprises a shell, an electrode assembly, an end cover assembly and a binding piece, wherein the shell is provided with an accommodating cavity; the electrode assembly is arranged in the accommodating cavity, the electrode assembly comprises a plurality of tabs and an electrode main body which are electrically connected, and the tabs and the electrode main body are arranged along a first direction; the end cover assembly is arranged on one side of the shell and used for sealing the containing cavity. The binding piece is positioned between the end cover assembly and the electrode main body; the binding piece is provided with a penetrating hole, and the penetrating hole penetrates through the two opposite surfaces of the binding piece in the first direction. The penetrating hole extends along a second direction, the plurality of tabs penetrate through the penetrating hole, and the first direction is intersected with the second direction; the penetrating hole is provided with a first side wall and a second side wall which are oppositely arranged in the second direction, and in the second direction, the distance between the first side wall and the second side wall is larger than the size of the ends, close to the electrode body, of the tabs.

The utility model discloses a bathroom anti-skid ceramic tile which comprises a ceramic tile body, an installation groove is formed in the bottom of the ceramic tile body, and the bottom of the installation groove is attached to ground gravel. A connecting plate is attached to the top of the ceramic tile body, a friction block is attached to the top of the connecting plate, the friction block is made of a rubber material, a bolt is connected to the middle of the friction block in a penetrating mode, and the bottom of the bolt extends into the connecting plate to form a threaded connection mechanism; staggered drainage grooves are formed in the connecting plate, and the connecting plate is made of a plastic plate material; self-tapping pins are fixed to the four ends of the ceramic tile body, and plug pins are slidably connected into the self-tapping pins. According to the anti-skid ceramic tile for the bathroom, the friction blocks are installed, extrusion of water is avoided through the protruding arrangement of the friction blocks, so that the feet can make direct contact with the friction blocks, large friction force can be obtained through the friction blocks, and the anti-skid purpose is achieved.

The utility model relates to a vehicle door water cutting assembly, a vehicle door and a vehicle. The vehicle door water cutting assembly comprises a supporting plate, an inner water cutting part and a limiting assembly. The inner belt line comprises a main body part and a lip part, the main body part is connected to the supporting plate, and the lip part protrudes out of the end face, away from the supporting plate, of the main body part; the limiting assembly is connected to the supporting plate and comprises an abutting portion partially protruding out of the supporting plate, the abutting portion and the lip portion are located on the same side of the supporting plate, the length of the portion, protruding out of the supporting plate, of the abutting portion is adjustable, and the length of the portion, protruding out of the supporting plate, of the abutting portion is smaller than the length of the portion, protruding out of the supporting plate, of the lip portion when no force is applied. The length of the abutting part protruding out of the supporting plate is not smaller than the thickness of the body part. According to the scheme, the situation that the glass excessively extrudes the lip edge part of the inner sealing strip is avoided, then the problems of lifting abnormal sound, abrasion and the like caused by extrusion of the glass to the inner sealing strip are reduced, the sound quality of lifting of the glass is improved, the effect of preventing the glass from shaking when a door is opened can be achieved, and meanwhile the glass sealing strip can be applied to different requirements of different vehicles.

The invention provides an arc surface positioning and punching device for driving shaft machining and an operation method of the arc surface positioning and punching device, and relates to the field of punching. According to the arc surface positioning and punching device for machining the driving shaft and the operation method of the arc surface positioning and punching device, swing supports are installed on a base, supported through elastic pieces, provided with triangular structures and rotate around rotating shafts of the swing supports when stressed, the two sets of swing supports are symmetrically arranged, and pressure applying wheels and supporting wheels are rotatably arranged on the swing supports. The pressure applying wheel is used for applying pressing force to the driving shaft, and the supporting wheel is used for supporting the driving shaft; according to the arc surface positioning and punching device for driving shaft machining and the operation method of the arc surface positioning and punching device, rapid positioning and alignment can be achieved, driving shafts with different diameters can be automatically adapted, the driving shafts are directly driven through the friction force between an anti-skid belt and the driving shafts, circumferential angle adjustment is achieved, a winding wheel is controlled to rotate through a double-shaft servo motor, and the working efficiency is improved. And moving the unworn new section of the anti-skid belt to a contact area with the driving shaft to replace the original worn contact surface.

The utility model provides a kind of color master batch screening device, it is related to color master batch screening machine technical field, including screening machine body and screen, the upper side of screening machine body is fixed with material guiding mechanism, the material guiding mechanism includes mounting beam, inclined guide plate, flat push scraper and several comb ribs, the downside of flat push scraper is provided with flat push inclined plane, the both ends of mounting beam are bent downwards with connecting plate, connecting plate is screw-threaded and is provided with locating bolt, the end of locating bolt is resisted on the outer wall of screening machine body, the upside of sliding baffle is fixed with vertical optical axis, the top of vertical optical axis is connected with horizontal beam frame, lifting screw is rotatably connected on mounting beam, lifting screw is screw-threaded and is passed through horizontal beam frame.The utility model keeps long strip of defective product after flat push scraper in flat lying state, avoid long strip of defective product directly drop to lower layer via screen, reduce screening efficiency.

The invention relates to the technical field of lithium battery production, and discloses a liquid injection device for lithium battery production, the liquid injection device comprises a box body, a placing disc and a liquid box, the bottom of the box body is fixedly connected with a motor, the output end of the motor is fixedly connected with a screw rod, the surface of the screw rod is in threaded connection with a driving gear, and the driving gear is in threaded connection with the placing disc. Rotating shafts are fixedly connected to the top and the bottom of the driving gear, placing discs are fixedly connected to the surfaces of the rotating shafts, and a liquid box is fixedly connected to the top of the box body. Through cooperative use of a driving gear and a toothed plate, a motor is started, the motor drives the driving gear to rotate through a screw rod, the driving gear drives a second driven gear to rotate through a first driven gear engaged with the driving gear, the second driven gear drives the toothed plate to slide in a first storage groove, and the toothed plate drives a telescopic rod and a clamping plate to move; and the toothed plate drives the telescopic rod to stretch out and draw back through the clamping plate, so that the clamping plate is prevented from excessively extruding the lithium battery, and the effect of convenient fixation is achieved.

The application relates to the technical field of testing, and particularly discloses a protective sleeve testing method and testing equipment. The protective sleeve testing method comprises the following steps: determining a position, at which a pressing part of an inner pressing head replacing a mobile phone key is flush with a side wall of a mobile phone model, as an alignment position and a standard position; retracting the inner pressing head to a first zero position; sleeving a mobile phone protective sleeve on the mobile phone model; moving the inner pressing head outward and detecting pressure received by the inner pressing head in real time; when the pressure reaches a contact pressure value, recording a moving distance of the inner pressing head and recording the pressure received by the inner pressing head when the inner pressing head is located at the alignment position; judging whether the inner pressing head reaches the standard position; if yes, recording the pressure received by the inner pressing head when the inner pressing head reaches the standard position; otherwise, the inner pressing head continues to move outward to the standard position and the pressure received by the inner pressing head is recorded. The method improves the authenticity of detection and the reliability of detection results.

The invention discloses a flexible display screen folding and unfolding device and an electronic device, and relates to the technical field of electronic equipment.The flexible display screen folding and unfolding device comprises a first support, a second support and a driving mechanism, and the first support is slidably connected with the second support; the driving mechanism is arranged on the first support and the second support and used for driving the first support and the second support to slide relatively, the driving mechanism comprises a first driving assembly and a second driving assembly, and the first driving assembly is fixedly arranged on the first support and connected with the second support; the second driving assembly is fixedly arranged on the second support and connected with the first support, so that the second driving assembly and the first support have a more stable contact state and are not prone to deviation or separation under the dynamic load, continuous transmission of force is kept, vibration and noise generated by unstable interaction force can be reduced, and the service life of the device is prolonged. And the relative movement of the first bracket and the second bracket can be ensured to be more stable and smoother.

The utility model discloses a kind of inner and outer tooth slot screw, it includes head and the screw rod part being connected with the head, the end of the screw rod part close to the head is equipped with barrier part, the barrier part is spaced apart from the head and forms wiring slot, the central axis of the screw rod part is equipped with with the thread hole extending along its axial direction, the end surface of the head is equipped with driving slot, the driving slot is connected with the thread hole.The utility model is reasonable in structural design, utilize the space between barrier part and head and form annular wiring slot, specially used for accommodating connecting wire, when using fastening, by barrier part as physical separation barrier, barrier part will resist mounting surface, so that the space of wiring slot itself is reserved, prevent extruding to connecting wire;Meanwhile, thread hole can be used as threading passage or screw into another screw as nut function, multiple functions, meet different action needs.

This utility model discloses a library lending cart, including a frame and a cart bed fixedly connected inside the frame. A transmission rod is movably connected to the inside of the cart bed via bearings. A support plate is fixedly connected to the surface of the transmission rod, and a connector is fixedly connected to the top of the support plate. Books are inserted into the inner side of the connector. The support plate can tilt and swing the connector around the transmission rod as an axis. A transmission structure is provided on the left side of the frame, which can control the rotation of a shaft. The transmission structure includes a pedal movably connected to the left side of the frame via a pin. This utility model avoids page compression and bending caused by traditional stacking by using a vertical connector to insert books, reducing the damage rate. The tilting and swinging design arranges books in a stepped pattern, with exposed spine labels, facilitating quick identification of type and quantity by administrators. Furthermore, the linkage mechanism between the transmission rod and the support plate allows for flexible switching between book storage and display states.

The invention relates to machining assistance, and provides an anti-damage device for mounting a thread tooth socket of a graphite product, which comprises a workbench, and a lifting mechanism, a guide mechanism and a positioning mechanism which are mounted on the workbench, and the positioning mechanism is used for fixing the graphite product above the workbench; the lifting mechanism is used for enabling the guide mechanism to abut against the upper surface of the graphite product; the guide mechanism comprises a mounting plate, a telescopic assembly and at least three guide plates, the mounting plate is connected with the lifting mechanism, a mounting hole is formed in the mounting plate, all the guide plates are movably mounted in the mounting hole, and a guide hole is defined by all the guide plates; the telescopic assembly is used for enabling all the guide plates to be folded / separated. The anti-damage device for installation of the thread tooth socket of the graphite product plays a guiding role in the installation process of the thread tooth socket, and the thread tooth socket is prevented from obliquely entering due to poor centering.

This utility model discloses a miniature ball bearing for a cooling fan, comprising an outer ring, an inner ring, a cage, a dust cover, and rolling elements movably disposed between the outer and inner rings. Both the inner and outer peripheral walls of the outer ring and the inner ring have circumferentially formed grooves for the rolling elements to move. Both ends of the inner peripheral wall of the outer ring have circumferentially formed stepped grooves for installing the dust cover. The connections between the grooves of the inner ring and the outer peripheral wall of the inner ring, and between the grooves of the outer ring and the inner peripheral wall of the outer ring, have chamfered edges. A retaining spring is provided in the stepped groove for an interference fit with the stepped groove. The inner wall of the retaining spring abuts against the outer wall of the dust cover, while the outer peripheral wall of the dust cover has a clearance fit with the inner peripheral wall of the stepped groove. The curvature coefficient of the grooves of the outer ring is greater than that of the grooves of the inner ring. This utility model solves the problems of traditional miniature ball bearings, such as increased bearing ellipticity due to dust cover installation leading to out-of-tolerance bearing ellipticity, and assembly damage during rolling element installation leading to unqualified rolling element vibration during bearing operation.

The utility model relates to the technical field of recycled aluminium recycling, specifically discloses a recycled aluminium impurity removal device, including device casing, the first transmission belt and second transmission belt are arranged in device casing inside level, the first transmission belt is parallel with second transmission belt and sets up, is equipped with the cleaning mechanism on the first transmission belt, and the second transmission belt bottom is equipped with the feeding mechanism. In the utility model, the adhered waste material can be cleaned, the service life of the equipment is effectively improved, and secondary or multiple screening and impurity removal are facilitated.