27results about How to "Multiple contact areas" patented technology

The invention relates to the technical field of bearing machining, in particular to bearing ring automatic machining equipment which comprises a supporting plate, a driving device is fixedly mounted at the upper end of the supporting plate, and a turning head for machining a bearing ring is fixedly mounted at the driving end of the driving device. A rotating screw head is twisted to rotate and move in a connecting barrel, the moving rotating screw head drives a rotating ring to move, the rotating ring drives a telescopic support to move, the telescopic support drives a rotating frame to rotate and drives a first rotating head and a clamping jaw to rotate, and the rotating clamping jaw enables a clamping face to incline; therefore, when the bearing ring with the inclined outer side face or the inclined inner side face is clamped, the clamping jaw can have more contact area with the bearing ring, so that the clamping stability is guaranteed, and the clamping face of the clamping jaw can be driven to adjust different angles by rotating the screw head to clamp the bearing rings with different inclined faces.

The embodiment of the invention provides a driving motor for an electric vehicle, a power assembly and the electric vehicle, an end cover of a shell of the driving motor comprises a mounting groove and two side faces, one side face faces a rotor of the driving motor, and the other side face deviates from the rotor of the driving motor. The groove bottom or the groove wall of the installation groove comprises an open hole. One side face comprises a bearing groove, the other side face is used for fixing a cover plate, and the cover plate is used for enclosing the other side face to form a containing cavity. A through hole is formed in the groove bottom of the bearing groove and used for communicating the bearing groove with the containing cavity, so that oil gas on one side of the bearing groove flows into the containing cavity through the through hole. The other side surface comprises another open hole, the other open hole is exposed out of the accommodating cavity and is used for being communicated with one open hole through an internal channel of the end cover, and the axis of one open hole is intersected with the axis of the mounting groove, so that oil gas entering the accommodating cavity passes through the internal channel of the end cover from the other open hole and is arrayed through one open hole with an inclined axis; and an oil-gas condensation path is prolonged.

The invention discloses a quick-plug type high-voltage bus bar connecting structure which comprises a roll-shaped reed, a plurality of axial connecting strips and axial cantilever strips, the axial connecting strips and the axial cantilever strips are alternately arranged at intervals in the circumferential direction, and the two ends of the axial connecting strips in the length direction are integrally connected with the two axial ends of the roll-shaped reed. Only one end of the axial cantilever strip in the length direction is integrally connected with one axial end of the rolled reed; the socket sleeve is assembled with the outer ring of the rolled reed, the inner wall of the socket sleeve is provided with two inner protruding edges protruding inwards in the radial direction, the two shaft ends of the rolled reed abut against the inner protruding edges respectively, and the inner protruding edges can limit the longest axial size of the rolled reed; the corresponding inner diameter sizes of the roll-shaped reeds in the middle of the axial connecting strip and the axial cantilever strip are smaller than the corresponding inner diameter sizes of the roll-shaped reeds in the two ends of the axial connecting strip and the two ends of the axial cantilever strip; the roll-shaped reed is made of an integrated conductive elastic material. The high-voltage electric connector can be used for high-voltage electric connection, the rolled reeds bring good elastic clamping force, and the machining cost is low.

The invention relates to the field of field operation machinery, and discloses a crawler-type field operation wheelchair. A power body is welded to the lower surface of an operation supporting plate, a lower connecting rod is welded to the lower surface of a reference stress piece, a front end transverse rod is welded to the outer surface of the end, away from the lower connecting rod, of a bidirectional motor, a rolling gear is fixedly connected to the outer surface of the output end of the bidirectional motor, and an air cylinder is fixedly connected to the outer surface of the front end of the reference stress piece. The inner surfaces of the two sides of the upper transverse sleeve rod are movably sleeved with rolling gears, the outer surfaces of the rolling gears are movably connected with auxiliary crawlers, the auxiliary crawlers provide more contact areas, whether the two-way motor is started or not according to the actual situation, the two-way motor is started to drive the auxiliary crawlers to rotate, and power is provided for equipment in accordance with the clamping mechanism. The forward extension of the upper transverse sleeve rod facilitates the contact with a slope with a certain height at the front end, the stress area is increased for climbing, and the rotation of a reference stress piece assists the whole steering of the crawler belt for operation when small-angle turning is needed.

The invention relates to an improved novel wall connecting piece, and relates to the technical field of building construction, the improved novel wall connecting piece is mounted on a wall template so as to be conveniently embedded in a wall, the wall connecting piece comprises a connecting piece inserted into the wall template, the connecting piece penetrates through the wall template so as to form an overhanging end on the inner side of the wall template, and the overhanging end is connected with the wall template through a connecting rod. A connecting end is formed on the outer side of the wall formwork, the width of the end, away from the wall formwork, of the anchoring part is enlarged to form an anchoring part expanding head, more contact parts are increased during concrete pouring through the anchoring part expanding head, and after the concrete is completely dried to form the wall, the anchoring part expanding head is expanded to form the anchoring part. The anchoring part can generate a larger contact area during concrete pouring, then the connecting part is connected with the anchoring part, the anchoring part expanding head is reliably connected with the wall body, and the connecting effect is improved by generating more contact parts between the anchoring part expanding head and the wall body; and the wall connecting piece cannot deviate or fall off in the concrete pouring and vibrating operation process.

The utility model discloses a PE pipe convenient to assemble, and relates to the field of PE pipes, the PE pipe convenient to assemble comprises a pipe body, the inner wall of the pipe body is coated with a reinforcing layer, the reinforcing layer comprises a sintered epoxy powder coating, and the inner wall of the pipe body is polished to form a micro convex-concave structural surface. The fritted epoxy powder coating is coated on the micro convex-concave structure surface, and the surface of the fritted epoxy powder coating is kept smooth; the inner wall of the pipeline body is coated with the reinforcing layer used for enhancing the high temperature resistance and chemical corrosion resistance of the pipeline body, so that the overall performance of the pipeline body is improved, and the service life of the pipeline body is prolonged. And a plurality of reinforcing ribs are arranged in the pipeline body at equal intervals, so that the bearing capacity and the anti-pressure capacity of the pipeline body can be effectively improved.

The utility model relates to a pre-embedded external scaffold wall connecting assembly for a multi-layer masonry structure, and relates to the technical field of scaffold wall connecting assemblies. The wall frame comprises an outer seat and an inner frame, the inner frame is embedded and fixed in a wall surface, the outer seat is fixedly installed at the outer end of the inner frame, a connecting piece is installed on the outer seat in an inserted mode, the connecting piece and the outer seat are clamped and fixed, a reinforcing frame is arranged on the connecting piece in a sleeved mode, and the two ends of the reinforcing frame are fixed to the wall surface through bolts. Limiting frames are symmetrically arranged in the middle of the reinforcing frame, and the limiting frames and the reinforcing frame are integrally formed. According to the external scaffold wall connecting assembly, the wall frame is pre-embedded in the wall body, so that when a scaffold needs to be installed, the connecting piece can be inserted and installed on the wall frame to serve as the external scaffold wall connecting assembly, the reinforcing frame is installed on the connecting piece in a sleeving mode, and auxiliary supporting of the connecting piece is conveniently achieved through the reinforcing frame; therefore, the use strength of the connecting piece can be ensured.

The application discloses a preparation method of a high-peeling-strength inner support polyvinylidene fluoride hollow fiber membrane, and comprises the following steps: (1) mixing polyvinylidene fluoride, a hydrophilic pore-forming agent and an organic solvent to obtain a casting solution; (2) coating the casting solution on a modified support tube through a spinning nozzle, then walking vertically downward in the air, and then entering a coagulation bath to be coagulated and formed into a formed piece; and (3) soaking the formed piece obtained in the step (2) in pure water, then placing the formed piece in a mixed liquid of water and glycerol, and then drying to obtain the high-peeling-strength inner support polyvinylidene fluoride hollow fiber membrane. The anti-hook type support tube prepared by using the anti-hook technology has an increased roughness of the surface of the support tube, the casting solution and the support tube can have more contact areas, the adhesion between the membrane layer and the support tube is greatly improved, and the peeling and peeling-off of the membrane layer caused by washing during the operation of a membrane module can be effectively reduced.

The cable tinning tool comprises a positioning plate, a middle plate and a base plate, the positioning plate is provided with a plurality of positioning grooves used for positioning cables, each positioning groove comprises a blind groove section and a through groove section which are communicated with each other, each through groove section is provided with at least one bending part, the positioning plate is further provided with a plurality of groups of hollow structures, and the hollow structures are arranged on the middle plate. Each hollowed-out structure comprises two hollowed-out grooves which are oppositely arranged, and the through groove section is located between the two hollowed-out grooves in the hollowed-out structures and communicates with the two hollowed-out grooves; the middle plate is located below the positioning plate, a through groove and a plurality of positioning blocks are arranged on the middle plate, the positioning blocks are arranged corresponding to the hollowed-out grooves, and the through groove is arranged corresponding to the through groove section; the base plate is located below the middle plate. The base plate is provided with an ejection rib arranged corresponding to the through groove section and an elastic abutting assembly used for abutting against the positioning plate. When the cable tinning tool is used for tinning operation, the bending radius of the cable can be smaller, no cracking risk exists, and the production yield is higher.

The invention discloses a spraying plate structure and vapor deposition equipment applying the spraying plate structure, the spraying plate structure comprises a spraying plate assembly and a heating assembly, the heating assembly comprises an annular heating wire unit, and the heating wire unit is nested in the spraying plate assembly and surrounds the spraying plate assembly in the circumferential direction. The heating wire unit is embedded in the spraying plate assembly, namely the heating wire unit and the spraying plate assembly are of an integrated structure, the heating wire unit and the spraying plate assembly have a larger contact area through the arrangement mode, heat is not prone to being diffused to the outside, and therefore the heating efficiency can be improved, it is guaranteed that the temperature of the heating wire unit is basically equal to that of the spraying plate assembly, and the heating efficiency is improved. The temperature difference between the heating ring and the spraying plate is prevented from being too large to affect the deposition effect of the film, and the technical problem that in a traditional scheme, due to the fact that the heating ring and the spraying plate are two parts, the temperature difference exists between the temperature of the heating ring and the temperature of the spraying plate, and then the deposition effect of the film is affected is solved.

According to the efficient spraying acid-base washing tower, through the design that the nozzles face upwards, sprayed washing liquid can be diffused and sprayed upwards, the washing liquid sprayed out of the nozzles located on the lower portion collides with the bottom end of a net plate located on the upper portion, and then the washing liquid falls back again after being scattered; at the moment, the scattered and fallen washing liquid and the washing liquid sprayed upwards cover the whole space in a large area, so that the washing liquid diffused in the large area can have more contact area with the ascending waste gas, and the washing effect is improved. Meanwhile, when falling back and scattered washing liquid falls on the water distribution pipeline and the screen plates, the washing liquid is gathered due to blocking of the water distribution pipeline and the screen plates to form large liquid drops, and the liquid drops formed by the upper screen plate fall down through holes in the screen plates and impact the washing liquid which is located below and sprayed upwards in the opposite direction, so that the washing liquid is sprayed upwards. The diffusion condition of the washing liquid is further improved, the gas-liquid contact area is increased, and the washing effect is further improved.

The utility model discloses a kind of efficient energy-saving electric heating pipes, the device includes: pipe body, the pipe body one end is equipped with end cap, the end cap one end is equipped with two lead wires, the pipe body sequentially includes base layer, oxidation resistance layer, reflective heat insulation layer from inside to outside, the base layer inner wall is equipped with evenly distributed heat dissipation rib. The utility model has the advantages that: pipe body is sequentially set base layer, oxidation resistance layer and reflective heat insulation layer from inside to outside, reflective heat insulation layer is like a layer of "heat shield", can efficiently reflect the heat radiated outward in pipe body interior, heat is "intercepted" in pipe, reduce the dissipation of heat to surrounding environment, so that more heat can be concentrated for heating target object;Base layer inner wall is provided with the heat dissipation rib that is distributed in helical shape, this unique helical structure increases the surface area of base layer inner wall, provides more passageway and contact area for heat transfer, effectively reduces energy consumption, meets the environmental protection requirement of energy saving and emission reduction currently.

The support-free rechargeable lithium battery comprises a steel shell, a battery cell and a PCB (Printed Circuit Board), the top end and the bottom end of the steel shell are respectively provided with an upper opening and a lower opening, the battery cell is arranged in the steel shell, the bottom end of the battery cell is provided with a first negative electrode end, and the top end of the battery cell is provided with a positive electrode end and a second negative electrode end. According to the utility model, the gap between the PCB and the steel shell is filled by adopting an in-shell injection molding mode, and the plastic is fluid when being injected, so that the inner side wall of the steel shell and the space (namely the gap between the accommodating space and the PCB) between the top end of the battery cell and the top end of the steel shell can be better filled and contacted, and a larger contact area is achieved; the charging socket can support and buffer the PCB, and the plastic can effectively fill the gap in the accommodating space and the gap between the charging socket and the steel shell (charging opening), so that the waterproof effect on the PCB can be achieved.

The invention discloses a comprehensive wiring auxiliary device for weak current intelligent engineering, and relates to the technical field of weak current engineering. The device comprises a mounting plate, a through groove plate is fixed to the top of the mounting plate, a plurality of through grooves are fixed to the top of the through groove plate, mounting devices are arranged at the through grooves of the through groove plate, each mounting device comprises a sliding block, and the sliding blocks are slidably mounted in the through grooves of the through groove plate; springs are arranged between the front side and the rear side of the sliding block and the inner wall of the through groove of the through groove plate. Through the arrangement of the mounting device, the trapezoidal plates press and fix the wire in the U-shaped notch of the H-shaped plate, so that the purpose of quickly fixing the wire is achieved, and the U-shaped notch of the H-shaped plate and the two trapezoidal plates form a shield around the wire, so that the wire can be quickly fixed. Therefore, the wire cannot be forcibly dragged out of the clamping plates from the gaps between the clamping plates of the traditional wiring auxiliary device due to dragging, and the wiring operation of the wire is facilitated.

The utility model relates to a carrying integrated transport vehicle which comprises an unmanned transfer trolley, a warehouse frame, a sliding rail assembly and a clamping assembly, the warehouse frame is located on the unmanned transfer trolley, the sliding rail assembly comprises a longitudinal sliding rail and a transverse sliding rail, the transverse sliding rail is in sliding connection with the longitudinal sliding rail, a first driving part is arranged on the longitudinal sliding rail, and a second driving part is arranged on the transverse sliding rail. The longitudinal sliding rail can extend out of the unmanned transfer trolley, the clamping assembly is in sliding connection with the transverse sliding rail, a second driving part is arranged on the transverse sliding rail, the clamping assembly comprises a telescopic part and a clamping jaw, the telescopic part comprises a sliding base and a telescopic piece, the sliding base is in sliding connection with the transverse sliding rail, and the two ends of the telescopic piece are fixedly connected with the sliding base and the clamping jaw respectively. According to the transport vehicle in the scheme, the cylindrical nuclear waste storage and transportation tank can be automatically clamped without manual assistance, the problem that the cylindrical nuclear waste storage and transportation tank rolls down when the nuclear waste storage and transportation tank is loaded is solved, and the nuclear waste storage and transportation tank can be loaded on the premise that workers are prevented from being radiated.

The invention relates to a method for solving water seepage of a thermocouple intubation tube of a continuous casting crystallizer, which specifically comprises the following steps of: 1, cutting the end part of the intubation tube into a boss shape by using a machine tool, 2, manufacturing an annular sealing gasket by using rubber, and 3, sleeving the boss of the intubation tube with the annular sealing gasket manufactured in the step 2, and then inserting the annular sealing gasket into a back plate of the crystallizer, 4, after the step 3 is completed, the insertion depth of the insertion pipe is adjusted, and the sealing performance is guaranteed, 5, after the step 4 is completed, a hydrostatic test is conducted on the crystallizer, under the specified test time and test pressure, if water seepage does not occur, the sealing performance is good, and if water seepage occurs, the water seepage does not occur. And 6, the crystallizer which is tested to be qualified in the step 5 is sent to the next procedure, and a thermocouple is installed. According to the technical scheme, the sealing structure at the end part of the thermocouple insertion tube is improved, so that the purpose of high sealing performance is achieved.

The utility model relates to the technical field of heat shield fixing, in particular to a heat shield fixing device which comprises a base, a rotating mechanism is arranged on the top of the base, a driving mechanism is arranged on the rotating mechanism, two arc-shaped plates are arranged above the driving mechanism, and switching mechanisms are arranged on the arc-shaped plates. Through the arrangement of the arc-shaped plates and the switching mechanism, when the exhaust pipe heat insulation cover is clamped, the two arc-shaped plates are used for clamping, the contact area of the arc-shaped plates and the heat insulation cover is larger, the clamping stability is better, when other heat insulation covers are clamped, the screw can be rotated, the screw rotates and moves on the U-shaped plate, and therefore the heat insulation cover is clamped. The clamping blocks are driven to move to the outer portion of the arc-shaped plate, the two clamping blocks are used for clamping other heat insulation covers, through the arc-shaped plate and the switching mechanism, the heat insulation covers of different shapes can be clamped and fixed through the device, and practicability is improved.

The lateral-force-resistant tensioning hydraulic cylinder comprises a cylinder barrel, a piston rod and a sealing piece, a cylindrical hole used for installing the piston rod is formed in the center of the cylinder barrel, an oil inlet and outlet hole used for being communicated with the cylindrical hole is formed in the side wall of the cylinder barrel, a groove used for installing the sealing piece is formed in the inner wall of the cylindrical hole, and the width of the groove is larger than that of the sealing piece. The sealing piece is installed in the groove, copper rings are arranged in gaps between the two sides of the sealing piece and the groove in a surfacing mode, the piston rod is installed in the cylindrical hole with the sealing piece and the copper rings in a sliding mode, the copper rings make contact with the piston rod and serve as sliding supports, the cylinder barrel is of a square structure, and the cylinder barrel can bear larger bending moment and lateral force in appearance. In the installation process, the cylinder barrel can be directly pushed into a main engine structural part, an anti-rotation limiting plate does not need to be designed for a main engine, the cylinder barrel is suitable for being used in a narrow installation space, lateral force in the movement process of the rod body can be counteracted through the arrangement of the copper ring, and installation and maintenance are easy.

The utility model provides a binding assembly for financial vouchers, which relates to the technical field of financial management and comprises a bottom plate, a binding assembly is arranged on the bottom plate, a fixing assembly is arranged on one side, close to the binding assembly, of the bottom plate, the binding assembly comprises a fixing seat, a limiting groove is formed in the fixing seat, and a binding groove is formed in the bottom of the fixing seat. An operator indirectly urges a push rod and a pressing plate to synchronously ascend through the lifting action of a rotating rod, a user is allowed to flatly place the financial vouchers in a binding groove in the process, then when the operator releases the rotating rod, resilience force of a second telescopic spring can drive the pressing plate to move downwards, and then the financial vouchers are pressed and fixed to a bottom plate; according to the financial voucher binding device, any displacement of financial vouchers in the binding process is effectively prevented, tidiness and accuracy of binding operation are ensured, the problem that the vouchers are not tidy possibly due to movement in the traditional binding process is solved, and therefore the technical problem that binding is affected due to movement of the financial vouchers in the binding process is solved.

This utility model belongs to the technical field of hydraulic components and discloses a relief valve for a walking motor, including a valve body and a plug fixedly connected to the end of the valve body. A sealing groove is formed between the outer peripheral wall of the plug and the inner peripheral wall of the valve body, and a sealing ring is installed in the sealing groove. The inner peripheral wall of the valve body includes a first wall and a second wall. The sealing ring abuts against the first wall, and the plug is fixedly connected to the second wall. The first wall has a first end away from the second wall and a second end close to the second wall along the axial direction. The vertical distance from the first end to the axis is denoted as L1, and the vertical distance from the second end to the axis is denoted as L2, where L1 is greater than L2. Under the same compression, the sealing ring of the relief valve of this utility model has a smaller effective contact area on the side of the sealing ring closer to the second end, which reduces the risk of the sealing ring detaching away from the second end due to the force. At the same time, it can also improve the sealing performance after the sealing ring is matched with the valve body and the plug to a certain extent.

The invention discloses a preparation method and application of a heterostructure LDH / oxide electrolyzed water catalyst, and belongs to the field of electrocatalyst.The preparation method comprises the following steps that firstly, cut NF (1 cm * 1 cm * 0.7 mm) is subjected to ultrasonic cleaning with HCl, absolute ethyl alcohol and deionized water, then the cleaned NF is placed in a metal ion precursor solution (Fe < 3 + > and Ce < 3 + >), and the metal ion precursor solution (Fe < 3 + > and Ce < 3 + >) is obtained; dropwise adding a certain amount of hydrogen peroxide for reaction to obtain a product. The spherical NiFe-LDH-CeO2 heterostructure is prepared through a simple wet chemical etching method, the preparation process of the catalyst is simple, the cost is low, and an electrochemical test shows that the obtained catalyst is good in water electrolysis effect.

The utility model relates to the field of lactation chairs, in particular to a chair with both lactation comfort and safety. The seat includes a cushion, a backrest, armrests, and a first airbag member. The backrest is connected with the cushion, the two armrests are arranged on the left side and the right side of the cushion, the height of the armrests can be adjusted by inflating, the first air bag part is embedded into the side, away from the backrest, of the top of the cushion, and the height of the side, away from the backrest, of the cushion is increased by inflating the first air bag part. According to the utility model, the armrests of which the height is adjusted through inflation are arranged, so that the contact is softer through the inflation mode while the auxiliary support is realized, and the problem of arm and shoulder ache caused by long-term lactation is solved; the first air bag part is arranged at the position of the cushion, so that thighs form an inclined angle when the baby is embraced, the baby is more surrounded and prevented from falling off, and the safety is improved while the comfort degree of legs is increased.

The invention discloses a heating deformation shoe and hat processing device capable of fully covering cloth with glue. The heating deformation shoe and hat processing device comprises a conveying assembly, and a pretreatment assembly, a gluing assembly, a cloth covering assembly, a cutting assembly and a thermoplastic assembly are sequentially arranged on the conveying assembly in the conveying direction; the pretreatment assembly comprises a grinding mechanism, a sweeping mechanism and a heating mechanism; the grinding mechanism comprises a housing, a grinding cylinder and a driving mechanism, and the grinding cylinder rotates in the circumferential direction and axially reciprocates at the same time through the driving mechanism. The cleaning mechanism comprises bristles, and the internal space of the housing is isolated through the bristles; the heating mechanism comprises an electric heating wire, a fan and a flow guide plate; the pretreatment assembly is provided with a heat circulation assembly used for recycling heat generated by the heating mechanism, and heat supply to the cloth covering assembly is achieved through the heat circulation assembly. And through mutual cooperation of the grinding mechanism, the cleaning mechanism and the heating mechanism, the surface treatment quality can be improved, it is guaranteed that the machining effect of the plastic plate is optimal, and the risk of machining flaws is reduced.

The utility model provides a clamping jaw mechanism of a battery core sorting machine, which relates to the technical field of sorting machine clamping jaws, and comprises a connecting piece, one end of the connecting piece is rotatably connected with a clamping jaw body, one side of the clamping jaw body is provided with a chute, the inner wall of the chute is provided with two clamping blocks, and the clamping blocks are connected with the connecting piece. According to the utility model, the plurality of rectangular blocks are arranged, one side of the auxiliary plate is divided into a plurality of small parts, and one side of the auxiliary plate is abutted against the outer surface of a battery chip instead of the clamping blocks and the outer surface of the auxiliary plate, so that when the two clamping blocks are close to each other to clamp the chip, the outer surface of the chip extrudes the rectangular blocks; when the clamping jaw mechanism is used for clamping the battery chip, the rectangular block extrudes the spring to deform the spring, so that enough contact area between the chip and the rectangular block can be ensured to a certain extent no matter what shape of the battery chip is, the battery chip can be prevented from being separated from the clamping jaw mechanism when the chip is grabbed, and the grabbing efficiency of the clamping jaw mechanism is improved.

The invention discloses a pipe clamp for a hub and a sleeve of a bicycle, which comprises arc-shaped clamping rings including a first arc-shaped clamping ring and a second arc-shaped clamping ring, the buffering ring is provided with a double-layer attaching part, and the inner ring of the arc-shaped clamping ring is in contact with the buffering ring; and in the radial outward direction of the buffer ring, the attaching part sequentially comprises a covering section and a convex tongue section, the covering section is clamped by the clamping position, and a kidney-shaped hole allowing a bolt to penetrate through is formed in the covering section. The kidney-shaped holes comprise the first kidney-shaped hole and the second kidney-shaped hole which are perpendicular to each other and attached in a crossed mode, a square through hole is formed in the overlapping position of the first kidney-shaped hole and the second kidney-shaped hole, the outline of the square through hole is square, the side length of the square through hole is smaller than the diameter of the bolt, and the diagonal length of the square through hole is larger than the diameter of the bolt. By the adoption of the buffer ring, a bicycle sleeve or a hub can be buffered and protected, the locating and tightening effect of the buffer ring is good, and the buffer ring also has the effect of improving assembly similar to that of a gasket for a bolt.