5310 results about "Interference fit" patented technology

The invention discloses an accurate digital twinning method and system for high-end motor iron core mold assembly. The method comprises the following steps: carrying out point cloud data acquisition on all template holes and inserts in a mold; and respectively fitting according to the point cloud data of each template hole and the insert to form a curved surface. And according to the curved surfaces corresponding to each template hole and each insert and the ideal position of each insert on the mold, establishing an accurate digital twin assembly model of the template and each insert. And through interference assembly simulation and a multi-target parameter optimization scheme, iterative optimization is carried out on the design position of the template hole. According to the method, the distance between the hole center position, obtained through simulation, of the assembled template hole and the ideal position of the corresponding insert on the mold serves as the fitness function, rapid iteration of the design position of the template hole is achieved in combination with the multi-target genetic algorithm, and the design optimization efficiency of the high-end motor iron core mold is improved.

The invention discloses an efficient cooling grinding wheel applied to ultrasonic machining, and relates to the technical field of ultrasonic auxiliary grinding machining tools, the efficient cooling grinding wheel comprises an upper ultrasonic grinding wheel base rod and a lower ultrasonic grinding wheel grinding head, and the ultrasonic grinding wheel base rod and the ultrasonic grinding wheel grinding head are of an integrated structure; the interior of the ultrasonic grinding wheel base rod is hollow and extends to the bottom of the ultrasonic grinding wheel grinding head without penetrating, the interior of the ultrasonic grinding wheel base rod is in threaded connection or interference fit with a sleeve, the interior of the sleeve is hollow and serves as a main cooling liquid flow channel, the diameter of the interior of the sleeve is the main cooling liquid flow channel, and the diameter of the main flow channel can be changed; a plurality of round holes are formed in the grinding wheel grinding head to serve as cooling liquid flow channels of the grinding head, inlets of the cooling liquid flow channels of the grinding head are connected with the tail end of the main cooling liquid flow channel, outlets of the cooling liquid flow channels of the grinding head are located at the machining position in the grinding process, and cooling liquid grooves are machined in the cooling liquid outlets of the grinding head. And inner cavities of the main cooling liquid flow channel and the grinding head cooling liquid flow channel are provided with rifling structures with variable screw pitches and variable number.

The high-torque-density light-weight humanoid robot harmonic reducer comprises a rigid gear, a flexible gear and a wave generator, the rigid gear is of an annular structure with an inner gear ring, the tooth shape of the inner gear ring is an involute tooth shape, the flexible gear is of a thin-wall cup-shaped structure, an outer gear ring is arranged on the outer wall of the flexible gear, and the wave generator is arranged on the outer wall of the flexible gear. The tooth shape of the outer gear ring is matched with the tooth shape of the inner gear ring of the rigid gear, an installation shaft hole is formed in the center of the cup bottom of the flexible gear, the wave generator comprises an oval flexible bearing and a cam installed on the outer side of the flexible bearing, the cam is in interference fit with the flexible bearing, and the wave generator is installed in the installation shaft hole of the flexible gear. The flexible gear is used for enabling the flexible gear to generate elastic deformation, and a heat dissipation assembly is detachably installed in an installation shaft hole of the flexible gear. By arranging the heat dissipation assembly, the heat dissipation effect of the harmonic reducer is remarkably improved, the internal temperature is reduced, the working stability of the reducer during high-load operation is improved, and the service life of the reducer during high-load operation is prolonged.

The present invention discloses a voltage-resistant motor housing and its processing method. A double-layer motor housing structure is used. First, according to the usage environment of the motor, the corresponding materials for the outer housing and the inner housing are selected, and rough machining is performed on the inner housing and the outer housing, and process holes are opened. The inner housing and the outer housing are assembled by interference fit. Then, spiral grooves for cooperating with the outer periphery of the stator for stator cooling are machined on the inner surface of the inner housing, and then finish machining of the inner hole of the inner housing is carried out. The machining size of the inner hole of the inner housing is determined according to the size of the motor stator. The motor housing of the present invention adopts a double-layer housing structure. The outer housing maintains the structural strength of the motor housing, and the inner housing fixes the internal stator components. It can be compatible with different sizes of motor structures. The interference fit assembly structure can still keep the inner housing and the outer housing closely attached to each other under high-temperature and high-pressure environments without detachment, improving the reliability of the motor housing.

The invention provides a folding mechanism and electronic equipment. The folding mechanism comprises a main shaft, a first fixing frame, a second fixing frame, a first rotating piece, a second rotating piece, a first supporting plate, a second supporting plate and a first connecting arm, the first rotating piece is movably connected with the main shaft and the first fixing frame, the second rotating piece is movably connected with the main shaft and the second fixing frame, and the first supporting plate is movably connected with the first fixing frame and the first rotating piece; the second supporting plate is movably connected with the second fixing frame and the second rotating part, the first connecting arm is movably connected with the first fixing frame and the main shaft, the first connecting arm is provided with a first matching surface, the first supporting plate is provided with a second matching surface, and when the folding mechanism is in a flattened state, the first matching surface of the first connecting arm is in interference fit with the second matching surface of the first supporting plate; therefore, the angle between the first supporting plate and the main shaft is controlled through the acting force between the first matching face and the second matching face, and the angle between the first supporting plate and the main shaft is equal to 180 degrees as much as possible.

A surgical tool (1) comprising: a plurality of arms (2), each of the plurality of arms comprises an aperture; an elongate pin extending through the aperture of each of the plurality of arms, said elongate pin (8) comprising an end stop (10) at a first end of the elongate pin, said stop (10) being adjacent to the aperture of a first arm (3) of the plurality of arms (2), and an end portion at a second end of the elongate pin, said end portion extending beyond a second arm (4) of the plurality of arms; a bearing plate mounted onto said end portion of the pin directly adjacent to the aperture of the second arm (4), wherein the end portion comprises a deformed region, deformed such that the pin (8) forms an interference fit with the bearing plate. Also provided is a method (400) of manufacturing said surgical tool.

The invention provides a high-precision spinning forming process method for a ribbed cylinder section, and aims to solve the problems of diameter expansion, unevenness in deformation and the like in the traditional spinning process. The process comprises the following steps: performing double-sided turning on a prefabricated cylinder blank to ensure the inclination, mounting a spinning mold with a rib structure, heating the cylinder blank, and sleeving the heated cylinder blank on a mold with an inner cross groove to realize interference fit. And then, a three-spinning-roller spinning machine is started for spinning, the plasticity of the material is improved through induction heating, and the material flows into a cross groove of the mold. And after spinning is completed, the spinning roller is replaced with a turning tool, the outer surface is turned, and finally the part is taken out. According to the method, the inner diameter is controlled through material thermal expansion coefficient difference and diameter compensation, and boundary dimension homogenization is achieved through the induction heating and in-situ turning technology. The process is suitable for materials such as aluminum alloy and high-strength steel, the size precision of the cylinder section is remarkably improved, and technical support is provided for overall near-net forming of aircraft cylinder sections such as tactical projectiles. The spinning process is optimized, and the quality and performance of a final product are improved.

A multi-piece seat having a base and a top. Some embodiments may have a seal. The multi-piece seat is configured to be installed in a conventional fluid end. Installation of the multi-piece seat is simplified by the separate components. The base may be installed easily without an interference fit. The top may be installed easily with an interference fit but with a smaller engagement area than the prior art. Removal and replacement of any of the components is simplified for the same reasons. Operating cost is reduced by only using the harder material in the component that engages the valve. Additional components may be added to increase the height of the seal assembly.

The utility model belongs to the technical field of agriculture and forestry machinery, and particularly relates to a soil improvement device. Comprising a deep scarification gun, an air inlet pipe and a spray explosion tank, the lower end of the deep scarification gun is in interference fit with a deep scarification head, the deep scarification head is of a conical structure, an airflow channel is formed in the deep scarification gun, a spraying hole is formed in the lower end of the deep scarification gun, an air inlet is formed in the side wall of the upper end of the deep scarification gun, and the airflow channel is communicated with the spraying hole and the air inlet; the air inlet pipe comprises a hose and a metal pipe, one end of the hose is communicated with the metal pipe, the metal pipe is in interference fit with the air inlet, and the other end of the hose is communicated with the air outlet of the spray explosion tank. According to the scheme, through the integrated modeling design of the deep scarification gun, the drill rod, the deep applying rod and the deep applying head are connected instead of threads or bolts, unnecessary connecting structures on parts are reduced, meanwhile, connecting pieces are reduced, the mechanical property of the deep scarification gun is optimized, the durability of the parts is improved, and the service life of the deep scarification gun is remarkably prolonged.

The invention discloses a laminated structure and a differentiated hole machining method of the laminated structure, and relates to the technical field of machining, the method comprises the steps that S1, first reaming is conducted on the laminated structure, and the laminated structure comprises two or more layers of laminated plates; s2, linings made of matched materials are selected according to the material characteristics of different plates; s3, bushings made of different materials are installed in the reamed holes of the matched plates by pulling the core rod; s4, the linings made of the different materials are extruded, so that the linings made of the different materials are in interference fit with the matched plates; and S5, secondary reaming is conducted on the laminated structure according to the assembly requirement, so that the inner diameters of the deformed bushings made of different materials are the same. According to the method, the fatigue performance of plates made of different materials is coordinated through a differential hole machining method, and the fatigue life of the laminated structure is remarkably prolonged; and it is guaranteed that hole machining of different machining amounts is conducted on the laminated structure under one-time hole forming, the continuity of the hole forming technology is guaranteed, and the hole position precision is improved.

The utility model provides a sealing aging test device for multi-environment simulation. The sealing aging test device comprises an upper end cover, a lower end cover, a gasket, a to-be-tested sealing ring and a sealing ring, the gasket is arranged between each stage of lower end cover and the upper end cover, the to-be-tested sealing ring is arranged between each stage of lower end cover and the gasket, and the sealing rings are arranged between the gasket and each stage of upper end cover and between the middle upper end cover and the middle lower end cover; the end covers are connected through bolts, and the gaskets are in interference fit connection or threaded connection with the upper end covers; the end cover center hole channel forms a first flow channel, the outer side hole channel forms a second flow channel, and flow channel isolation is achieved through a sealing ring. The aging conditions of the sealing ring under different compression amounts can be tested by adjusting the thickness of the gasket, the influence of different unbalance loading forces on the aging performance of the sealing ring can be tested by adjusting the gradient of the first end face of the gasket, and the aging conditions of the sealing ring under different working conditions can be simulated by inputting media into the two flow channels. Multiple groups of upper and lower end covers can be continuously added in the device.

The invention discloses a pilot valve for hydraulic adjustment, and relates to the technical field of pilot valves, the pilot valve comprises a main valve sleeve assembly, an electromagnet assembly and a coil assembly which are assembled in sequence, the electromagnet assembly comprises a shell and a driving shaft, the driving shaft is assembled in the shell in a sliding mode, and the main valve sleeve assembly comprises an end cover, a main valve sleeve, a main valve element, a front valve element, a main spring seat and a pilot valve element. The main valve sleeve is fixedly installed in the shell, the end cover is in interference fit with the end, away from the shell, of the main valve sleeve, the main valve element is slidably assembled in the main valve sleeve, the front valve element is slidably assembled in the main valve element, the main spring seat is slidably assembled in the front valve element, and one end of the main spring seat movably penetrates through the front valve element to be in threaded connection with the end cover. A main elastic piece is assembled between the main spring seat and the front valve element, the pilot valve element is assembled between the main valve element and the driving shaft in a sliding mode and located on the moving path of the driving shaft, and a pilot elastic piece is assembled between the pilot valve element and the main valve element. Assembly is easy, machining difficulty is reduced, mass production is facilitated, and cost is reduced.

The application provides a secondary injection mold for an automobile decoration strip and belongs to the technical field of automobile accessories. The secondary injection mold for the automobile decoration strip comprises an upper mold plate and a lower mold plate, two lower forming cavities with the same profile are formed in the lower mold plate, the two lower forming cavities are arranged in a central symmetry relative to the central axis of the lower mold plate, an installation groove is formed in the side wall of the lower forming cavity, a forming insert one is fixed on the installation groove, a left inclined guide column and a right inclined guide column extending downward are further fixed on the upper mold plate, a left inclined slide strip is slidably arranged on the left inclined guide column, a right inclined slide strip is slidably arranged on the right inclined guide column, a forming insert two is fixed on one side of the left inclined slide strip, one side of the forming insert two extends into the upper forming cavity two, and the material of the forming insert one and the forming insert two is an elastic high-temperature-resistant resin material. When the mold is closed and formed, the forming insert one and the forming insert two can be in interference fit with other fitting surfaces of the mold, so that the gap of the plastic raw material into the fitting surface is eliminated, and the glue overflow and the burr are not generated.

The invention belongs to the technical field of wheelchairs, and particularly relates to a foldable wheelchair which comprises a backrest frame body, a seat plate frame body, armrest frame bodies and a folding mechanism, the folding mechanism comprises a first folding arm and a second folding arm, the top end of the first folding arm is rotationally connected with the front end of the seat plate frame body, and the top end of the second folding arm is rotationally connected with the bottom end of the backrest frame body; the top of the second folding arm is fixedly connected with the bottom of the backrest frame body through bolts which are in interference fit and can be movably locked, the left bolt and the right bolt are correspondingly arranged, and a pull rope is connected between the two bolts; the overall structural design is simple and ingenious, a user does not need to conduct complex operation when needing to fold, only the pull rope needs to be pulled, and when needing to unfold, only the bolts on the two sides need to be inserted, and locking can be completed.

The invention relates to the technical field of aero-engine rotor vibration tests, in particular to an aero-engine rotor unsteady-state thermally induced vibration test system which comprises a rotor experiment table, an air inlet and exhaust system, a lubricating oil system, a protection system and a heating system. The rotor experiment table comprises a first supporting system, a second supporting system, a rotor outer protection casing, a gas compressor disc, a gas compressor sealing disc, a turbine disc, a turbine front sealing disc, a front shaft diameter, an inter-disc drum, a rear shaft diameter, a first squirrel-cage elastic support, a ball bearing, a second squirrel-cage elastic support and a rolling rod bearing. The first supporting system is composed of a first squirrel-cage type elastic support and a ball bearing, meanwhile, an air inlet is formed in the first supporting system, and the ball bearing in the first supporting system is connected with the front shaft diameter in an interference fit mode. Rotor unsteady-state characteristics considering heating conditions are finally created, and vibration response and durability of a wheel disc structure under the unsteady-state thermal load condition are studied in combination with test conditions such as temperature vibration and the like.

A disposable cartridge assembly for stick products, intended to be used in conjunction with a rotating base that unlocks the cartridge and raises and lowers the stick product freely, while a holding cup slides in a six-track spiral sleeve of the disposable cartridge. The disposable cartridge has a decorative shell fastened onto the spiral sleeve via an interference fit, for omitting any chemical adhesive. The rotating base is intended to remain connected to the cartridge assembly for the life of the stick product, but may be detached and reused with multiple cartridges, which can be sold individually for the purpose. These designs provide advantages of lower damage rate of transport, better product performance, higher cost efficiency and eco-friend manufacturing and using.

The invention belongs to the technical field of batteries, and discloses a battery shell and a battery, the battery shell comprises a shell body and a cover plate, the shell body comprises two oppositely arranged first wall surfaces and two oppositely arranged second wall surfaces, the cover plate comprises a sealing platform and a plugging boss, the sealing platform is used for sealing the shell body, and the plugging boss is used for plugging the shell body. The length size of the inserting boss in the first direction is a, the distance size between the two opposite first wall faces is c, and a-c is larger than or equal to 0.05 mm and smaller than or equal to 0.1 mm. According to the invention, the plugging boss is arranged, and the length dimension a of the plugging boss along the first direction is greater than the distance dimension c between the two opposite first wall surfaces, so that the contact area between the cover plate and the shell body is increased, interference fit is realized, the frictional resistance is improved, the cover plate is prevented from being bounced off when the cover plate and the shell body are assembled, and the service life of the cover plate is prolonged. Therefore, certain steps and gaps exist between the cover plate and the shell body, the process yield is improved, and the sealing effect after welding is improved.

The invention discloses a centrifugal compressor assembly error modeling method integrating manufacturing error and assembly deformation, which comprises the following specific steps: S1, measuring an assembly surface by adopting line laser and a three-coordinate measuring machine, assembling surface point clouds of all assembling parts of the centrifugal impeller of the centrifugal compressor are obtained through feature extraction, a surface model of the assembling parts in interference fit with the centrifugal impeller is reconstructed based on an NURBS curved surface modeling method, and deformation calculation of interference fit of the centrifugal impeller is conducted; s2, calculating a matching error of the assembly surface of each assembly part by adopting a point cloud constraint registration method; and S3, based on the assembly constraint relation between the matching surfaces and the improved Jacobian-spinor model, a centrifugal compressor centrifugal impeller assembly chain error transfer model is established. The method has the advantages that the problem that error sources are not comprehensively considered in the actual assembly process is solved, the constraint relation between assembly surface matching errors is considered, and the assembly chain error transmission model is constructed and used for improving the assembly error prediction precision.

The embodiment of the invention provides a stable-connection coaxial probe, and relates to the technical field of semiconductor testing, the stable-connection coaxial probe comprises a coaxial spring probe, an upper needle sleeve, a lower needle sleeve, an upper shaft block, a middle shaft block and a lower shaft block, the coaxial spring probe comprises a needle tube, a lower needle head, an upper needle head and an adjusting spring located between the upper needle head and the lower needle head, the coaxial spring probe is arranged in a sleeve assembly composed of an upper needle sleeve and a lower needle sleeve, the upper and lower needle heads of the coaxial spring probe extend out of the top end face of the upper needle sleeve and the bottom end face of the lower needle sleeve respectively, and the needle tube is in interference fit with a shaft hole of the middle shaft block. The upper end probe head and the lower end probe head of the coaxial spring probe are in clearance fit with a shaft hole of the upper shaft block and a shaft hole of the lower shaft block respectively, the middle shaft block is arranged on the combination portion of the upper probe sleeve and the lower probe sleeve, and the lower probe sleeve is provided with a telescopic sleeve which is connected with the lower probe head and prevents the lower probe head from shaking or shifting. The invention has the effect of improving the stability of the probe.

The long-acting conductive box type sealing ring comprises an outer framework, an inner framework and conductive rubber, the conductive rubber is installed on the outer side face of the outer framework, and the upper side face of the outer framework is used for being in interference fit with a tooth opening of a bearing outer ring; the conductive rubber comprises a main lip, the main lip comprises a lip waist part and a lip tip part, the lip waist part is wider than the lip tip part, the section of the main lip is conical, the lip tip part abuts against the upper side face of the inner framework, and the lower side face of the inner framework is used for being in interference fit with an inner ring of the bearing. According to the long-acting conductive box type sealing ring provided by the utility model, the box type sealing ring has a long-acting conductive function, and electric corrosion in a bearing is effectively avoided.

The invention discloses a puncture type automatic injection pen which comprises a trigger assembly, a power assembly, an injection assembly and a protection assembly. A limiting plug in the trigger assembly is in interference fit with a button, and the button is in limiting connection with the upper pen shell. A spring of the power assembly wraps a push rod and is installed in an outer body containing cavity, and the push rod compresses the spring and then is clamped into an outer body limiting hole to be pre-tightened. A medicine bottle of the pre-filling injection assembly is in interference fit with a rubber plug, the near end of a needle abuts against the medicine bottle, a protective cap is inserted into the far end, and the assembly can slide in the lower pen shell. The sliding sleeve of the protection assembly is located at the near end when not excited and moves to the far end after being excited. During excitation, the limiting plug is pulled to press the button, the push rod is released, the spring drives the push rod to impact the rubber plug, the pre-encapsulation injection assembly is pushed to move downwards, and the needle head punctures to complete injection; and after excitation, the sliding sleeve is screwed to lock and cover the needle head. The injection pen is operated by one hand, is rapid in injection, can prevent the needle from being accidentally injured, and ensures reliable medication.

The invention relates to a transmission device, a transmission system, a wind generating set and a maintenance method, the transmission device comprises a shafting assembly and an interference magnitude adjusting device, the shafting assembly comprises a main shaft and a bearing, the bearing is arranged around the main shaft, an inner ring of the bearing is in interference fit with the main shaft, and the main shaft is provided with a hollow cavity. The interference magnitude adjusting device is arranged in the hollow cavity and used for applying acting force to the inner wall face, defined by the main shaft, of the hollow cavity, so that the main shaft deforms to adjust the interference fit amount between the main shaft and the inner ring of the bearing. The bearing ring running probability can be reduced, and the power generation benefit of the wind generating set is guaranteed.

The invention provides a secondary injection mold for an automobile decoration strip, and belongs to the technical field of automobile parts. The secondary injection mold for the automobile trim strip comprises an upper mold plate and a lower mold plate, two lower forming cavities with the same outline are formed in the lower mold plate and are arranged in a central symmetry mode relative to the central axis of the lower mold plate, mounting grooves are formed in the side walls of the lower forming cavities, first forming inserts are fixed to the mounting grooves, and second forming inserts are fixed to the lower mold plate. A left inclined guide column and a right inclined guide column which extend downwards are further fixed to the upper die plate, a left inclined sliding strip is arranged on the left inclined guide column in a sliding mode, a right inclined sliding strip is arranged on the right inclined guide column in a sliding mode, a second forming insert is fixed to one side of the left inclined sliding strip, and one side of the second forming insert extends into the second upper forming cavity. The first forming insert and the second forming insert are made of elastic high-temperature-resistant resin materials. During mold closing and forming, the first forming insert and the second forming insert can be in interference fit with other binding faces of the mold, plastic raw materials are prevented from entering gaps of the binding faces, and burrs caused by glue overflowing are avoided.

The invention relates to the field of low-temperature liquid conveying equipment, and discloses a rotor supporting system of a low-temperature liquid pump, which is arranged on a pump rotating shaft and is used for supporting a rotor. The system includes a fixed bearing bushing, a swivel bearing bushing, and a flexible coupling bushing ring. The fixed bearing bushing is fixedly mounted in a bearing supporting seat of the pump body; the rotating bearing bush is arranged on the pump rotating shaft in a sleeving mode, and a sliding friction pair is formed between the rotating bearing bush and the fixed bearing bush. And the flexible connecting bushing ring is arranged between the rotary bearing bushing and the pump rotating shaft and is in interference fit with the rotary bearing bushing and the pump rotating shaft respectively. Through the flexible connection bushing ring, the thermal deformation difference of materials in a low-temperature environment can be absorbed, starting impact and operation friction damage are reduced, and therefore stable supporting and long-term reliable operation of the low-temperature liquid pump rotor are achieved.

The invention relates to the technical field of valve body flange machining, and discloses a valve body flange drilling and tapping integrated device which comprises a support, a protective cover installed above the support and an XY-axis moving platform installed in the protective cover. The procedures of vertical drilling, transverse drilling, tapping, overturning, scrap removal, slag removal, cutter cleaning and the like are integrated in one device, multi-face and multi-type hole machining of a valve body is completed in a protective cover at a time, the through hole end of the valve body is positioned in an interference fit mode through a limiting column, a positioning disc, servo motor driving and electromagnetic lock indexing positioning are matched, and the machining efficiency of the valve body is improved. The valve body is ensured to be strictly kept in the same axis in the rotating and subsequent fixed shaft overturning processes, the valve body can be automatically grabbed and accurately overturned by 180 degrees through the overturning mechanism, the limiting column can be accurately sleeved with the through hole in the other end of the valve body again through overturning, it is ensured that the through holes in the two ends are drilled in the same straight line, and the machining efficiency is improved. And the problem of positioning errors caused by manual overturning is solved.

An electromechanical actuator comprises a casing, an electric motor, a gearbox, a spring-applied brake (25) and a centring shaft (71). The brake (25) comprises a coil spring (48), a drum (49), an input member (50), an output member (51) and a bushing (76). The input member (50) comprises a first bore (72). The output member (51) comprises a first bore (73) and a second bore (74). The shaft (71) is mounted inside the first bore (73) of the output member (51) and a bore of a sun gear of a reduction stage of the gearbox. The bushing (76) comprises a bore (77), inside which the shaft (71) is mounted. The bushing (76) is mounted inside the first bore (72) of the input member (50) with an interference fit and inside the second bore (74) of the output member (51) with a loose fit.

The invention relates to a sealing structure of a flexible waterproof FFC wire harness and a forming process, and belongs to the technical field of automobile electronic wire harness manufacturing, the sealing structure comprises an FFC wire, a connector shell, a sealing ring and a blanking cap, the sealing ring is made of a fluororubber and hydrogenated butadiene-acrylonitrile rubber composite modified material, the connector shell is made of a glass fiber reinforced PP or PA66 material, and the blanking cap is made of a glass fiber reinforced PP or PA66 material. Under the cooperation of a vulcanizing agent system and an anti-aging agent system, double-material injection molding is adopted for integral forming, and double sealing is achieved through interference fit of the blanking cap and the sealing ring. The waterproof grade of the FFC wire harness reaches IP67, the weight is reduced, the size is reduced, the production efficiency is improved, and the FFC wire harness can be widely applied to wet area scenes such as automobile door lines, ceilings and seats, has the cost advantage and the environmental protection benefit, and has remarkable industrial application value.

The invention relates to the technical field of mechanical watch tourbillon, in particular to a rotation inertia adjustable double-shaft tourbillon structure which comprises a frame plate, a first direction shaft, an outer tourbillon, a second direction shaft, an inner tourbillon, an escapement mechanism and a transmission wheel train. The inner tourbillon is rotationally connected with the outer tourbillon through a second direction shaft, the escapement mechanism is arranged in the inner tourbillon and comprises an escapement wheel, an escapement fork and a hairspring balance wheel, four adjusting columns are arranged on the surface of the hairspring balance wheel in the circumferential direction of the hairspring balance wheel at equal intervals, the adjusting columns are sleeved with C-shaped weights, and the C-shaped weights are in interference fit with the adjusting columns; the transmission wheel train is used for driving the inner tourbillon to rotate around the second direction shaft while driving the outer tourbillon to rotate around the first direction shaft and driving the escapement wheel to rotate at the same time. The balance wheel has the effect that the rotation inertia of the balance wheel can be flexibly adjusted.

A joint assembly for joining a first component to a second component includes a first clevis including first clevis apertures and a second clevis including second clevis apertures. The joint assembly includes a first bearing insert and a second bearing insert fixedly coupled to the first clevis and the second clevis, respectively. The joint assembly includes a ring surrounding the first clevis and the second clevis and including a plurality of ring apertures. The joint assembly further includes a plurality of pins received within the corresponding ring aperture. Each pin includes a head portion and a shaft portion extending from the head portion. The shaft portion is coupled to the ring by a corresponding interference fit. The shaft portion is coupled to the corresponding first or second bearing inserts by a corresponding clearance fit such that the shaft portion is rotatable relative to the corresponding first or second bearing inserts.

The invention discloses a method and a system for determining the interference fit distance between a cable aluminum sheath and a buffer layer. The method comprises the following steps: determining a relation curve between the resistivity of the current buffer layer thickness and the deformation distance; marking a starting point, an end point and a plurality of assumed turning points in the relation curve, and for each assumed turning point, connecting the starting point and the assumed turning point to obtain a first fitting line segment, and connecting the assumed turning point and the end point to obtain a second fitting line segment; acquiring all original point data on the relation curve, and determining an optimal turning point on the relation curve according to all the original point data, the slope of the straight line where the first fitting line segment is located and the slope of the straight line where the second fitting line segment is located; and determining a deformation distance corresponding to the optimal turning point on the relation curve, and determining the deformation distance as the optimal interference fit distance between the aluminum sheath and the buffer layer. The optimal interference fit distance can be determined, and therefore it is guaranteed that the buffer layer has the good absorption capacity for thermal expansion of the XLPE insulating layer, and good conductivity is achieved between the aluminum sheath and the insulating shielding layer.