4118 results about "Interference fit" patented technology

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 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 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.

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.

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.

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 relates to a trunnion device adapting to the running posture of a floating body gate, the trunnion device is used for connecting a lock wall and the floating body gate, the trunnion device comprises a fixed support, a connecting mechanism and a movable support, the fixed support is fixedly connected with the lock wall, the movable support is fixedly connected with the floating body gate, and the connecting mechanism is fixedly connected with the fixed support. The fixed support is hinged to the movable support through a connecting mechanism. The connecting mechanism comprises a vertical shaft, a horizontal shaft, a knuckle bearing and a sliding bearing, a bearing seat is fixedly arranged at one end of the horizontal shaft, the knuckle bearing is arranged in the bearing seat of the horizontal shaft, the knuckle bearing is arranged on the vertical shaft in a sleeving mode, an outer ring of the knuckle bearing is in interference fit with the bearing seat, and the sliding bearing is arranged on the bearing seat. An inner ring of the knuckle bearing is in clearance fit with the vertical shaft, the fixed support is detachably and fixedly connected with the vertical shaft, a mounting hole is formed in the movable support, the sliding bearing is arranged at the end, away from the bearing seat, of the horizontal shaft in a sleeving mode, and the sliding bearing is detachably mounted between the horizontal shaft and the mounting hole. An outer ring of the sliding bearing is in interference fit with the mounting hole, and an inner ring of the sliding bearing is in transition fit with the horizontal shaft.

An electric vehicle discharge gun and a connecting structure of the discharge gun and a charging seat relate to the field of new energy vehicles and comprise a discharge gun body, a connecting piece and a spring. A mounting groove is formed in the discharge gun body, and at least part of the connecting piece is located in the mounting groove; the connecting piece comprises a pressing end, a connecting end and a locking end which are connected in sequence; mounting holes are formed in the two sides of the mounting groove, and connecting shafts are arranged on the mounting holes; the connecting end is provided with a connecting hole, the connecting piece is hinged to the connecting shaft through the connecting hole, and at least one mounting hole is communicated with the side wall of the discharge gun body; the connecting piece is hinged to the discharge gun body through the connecting shaft, the connecting shaft is fixed in the mounting hole, and the mounting hole is communicated with the discharge gun body, so that the connecting shaft can be mounted into the mounting hole from the side surface of the discharge gun body and is in interference fit with the mounting hole, and the mounting is conveniently and quickly realized.

The invention relates to equipment and a method for testing interference friction force and hydraulic locking force of a composite roller, and belongs to the technical field of composite roller testing. The testing equipment comprises a shaft core and an inner supporting expansion mechanism, the shaft core is hollow and is provided with shaft core sections with different diameters and is hollowed out, the inner supporting expansion mechanism comprises a lead screw, a plurality of outer supporting strips and a connecting rod supporting structure connected with the outer supporting strips and the lead screw, and the lead screw drives the outer supporting strips to move in the radial direction to be in interference fit with a roll collar to be tested. A first pressure sensor is arranged to measure contact pressure, and a second pressure sensor is arranged to measure locking force applied to a plurality of positions. According to the invention, the interference magnitude is accurately controlled and pressure data is collected through the inner support expansion mechanism, the interference friction force and hydraulic locking force transmission effect of the composite roller under different interference magnitudes can be accurately detected, and reliable test data is provided for the design of the composite roller.

The invention provides a hub bearing unit which comprises a flange outer ring, a flange inner ring and a transmission shaft, the transmission shaft comprises a connecting part and a first spline, the connecting part is inserted into the flange inner ring and fastened through a bolt, the first spline is arranged around the connecting part, a second spline is arranged at the end, facing the transmission shaft, of the flange inner ring, and the second spline is arranged around the connecting part. The flange inner ring comprises an inner hole wall, the first tensioning piece is located on the movement path of the inner hole wall when the flange inner ring and the transmission shaft are assembled, and the first tensioning piece is located on the inner hole wall when the flange inner ring and the transmission shaft are assembled. After the distance between the first spline and the second spline is smaller than the abutting distance, the first spline and the second spline are in interference fit with the inner hole wall. Aiming at the defects in the prior art, the invention provides the hub bearing unit capable of effectively feeding back the spline matching state.

The invention discloses a high-bearing-capacity self-lubricating sliding bearing and an assembling method thereof. The high-bearing-capacity self-lubricating sliding bearing comprises a bearing seat, a bearing cover and a bearing bush sleeve, wherein the bearing seat and the bearing cover are connected through a bolt; the bearing bush sleeve is tightly attached to the inner wall of the bearing seat and the inner wall of the bearing cover and is composed of two bearing bushes which are vertically spliced; the lining is connected to the inner wall of the bearing bush in a sliding mode and used for being in interference fit with an external rotating shaft and enabling the external rotating shaft to stably slide on the inner wall of the bearing bush, an oil slinger is connected to the middle of the outer wall of the lining in a sleeving mode, and oil slingers are symmetrically connected to the positions, close to the end face, of the outer wall of the lining in a sleeving mode, so that matched composite self-lubrication of the oil slinger and the oil slingers is achieved. And the lubricating unit is mounted on one side of the bearing seat and provides lubricating oil for the contact surface of the bearing bush and the bushing. The composite structure of the oil slinger and the oil slinger is used, so that internal lubricating oil can uniformly flow between the bushing and the bearing bush, and the service life of the whole sliding bearing is prolonged.

The utility model relates to the technical field of optical fiber sensors, and discloses a vibration measurement early warning device of a distributed optical fiber sensor, which comprises a shell, a vibration early warning body and a fixing module, and is characterized in that the vibration early warning body is arranged in a mounting groove of the shell; a fixing cylinder of the fixing module is arranged on the outer side wall of the shell, a sliding hole is formed in the top of the fixing cylinder, and a fixing groove communicated with the sliding hole is formed in the bottom; the piston rod comprises a sliding rod, one end of the sliding rod is provided with a rubber block, and the rubber block slides in the fixing groove and is in interference fit with the fixing cylinder; the piston rod ascends, the rubber block slides upwards, negative pressure is generated in the fixing barrel, the suction cup ascends along with the negative pressure, negative pressure is generated between the suction cup covering the opening of the fixing groove and the table top or the platform, and then the whole device is fixed through adsorption. A lap joint buckle is arranged on the top edge of the shell, the other end of the sliding rod penetrates through the sliding hole and is provided with a limiting block, the piston rod is pulled upwards, the limiting block can penetrate through the lap joint buckle and is clamped with the lap joint buckle, the mounting and dismounting steps are simple, and the maintenance efficiency of workers is improved.

The invention provides a circuit breaker fastener assembly and disassembly method and system based on thermally induced phase locking. The method comprises an installation stage and a disassembly stage. The installation stage comprises the following steps: assembling a circuit breaker assembly, pre-tightening a threaded fastener, and debugging an opening distance and an over travel to standard values; a first preset torque T1 is adopted for first-time fastening; the threaded fastener is heated to the target temperature Ttarget at the controllable heating rate through an electromagnetic induction heating device, and an accurate expansion gap is generated; carrying out secondary fastening by adopting a second preset moment T2 in a thermoplastic window period; and naturally cooling to form permanent thermally induced interference fit. The dismounting stage comprises the steps that a pre-cooling low-temperature medium is adopted to cool the threaded fastener to the target temperature Treve at the rapid cooling rate, and interference fit is converted into clearance fit; and lossless dismounting is realized. The invention relates to the technical field of circuit breakers.

The invention relates to the technical field of wind power bearing fatigue performance test, and discloses a wind power sliding bearing fatigue performance evaluation method comprising the following steps: S1, building a sliding bearing model based on a finite element, and analyzing the residual stress of interference fit between a shaft sleeve and a pin shaft in a sliding bearing; the stress state of the sliding bearing under the oil film pressure in the service environment is determined; s2, calculating axial structural stress distribution of the shaft sleeve, and solving structural stress amplitudes before and after oil film loading through difference; and S3, designing a three-point bending test, and calculating a structural stress value of a shaft sleeve section corresponding to a unit load by adopting finite element simulation. Aiming at the service safety of the sliding bearing in the wind power system, the stress concentration phenomenon possibly existing in the dissimilar material interface under the coupling influence of the working load and the interference fit residual stress and the transverse constraint characteristic of the multi-source gradient load acting on the dissimilar material interface state are fully considered; and the fatigue reliability of the sliding bearing coating and the nearby area is reasonably quantified.

The invention discloses an efficient and precise super-hard grinding tool preparation device, and relates to the technical field of grinding tool preparation. A vacuum box is fixedly installed at the bottom of the prefabricating cylinder through bolts, a strong vortex field is formed under the temperature control condition through a revolution-rotation composite stirring system driven by a planetary gear set, it is ensured that the superhard abrasive and a binding agent are mixed highly evenly and formed in a high-density mode, and then bubbles of the mixed material are effectively removed in a vacuum constant-temperature environment; a stable blank is formed through hot-pressing curing, the online resin synthesis function is integrated, the process efficiency is remarkably improved, meanwhile, zero-clearance interference fit of an inner hole of the grinding tool is achieved through the electromagnetic expansion clamping technology, and surface damage caused by traditional clamping is thoroughly eliminated. The precise slit coating head which is combined with multi-axis dynamic posture adjustment is suitable for uniformly coating silicone resin on a grinding tool with a complex curved surface, and high-precision and self-adaptive detection on the surface quality of the coated grinding tool is realized through multi-specification detection of the detection box.

The utility model discloses a lead assembly and a motor using the same. The lead assembly comprises a terminal connecting piece, a terminal piece suitable for being fixed in the terminal connecting piece, and a plurality of leads suitable for being pressed in the terminal piece. The terminal connecting piece at least comprises a body piece and a plurality of accommodating cavities arranged in the body piece; the terminal piece comprises a main body part, and a pair of combination parts and at least one pair of puncture parts which are respectively connected with the main body part; each pair of puncturing parts comprises two puncturing plates which are distributed side by side at an interval, and the two puncturing plates form an open slot suitable for accommodating one lead; the inner wall of the containing cavity is provided with a guide groove matched with each puncturing plate. At least one anti-falling structure in concave-convex interference fit is formed between the side wall, back on to the open groove, of each puncture plate and the guide groove. Each anti-falling structure comprises a convex hook pre-arranged on the puncturing plate and a groove formed by the guide groove due to extrusion deformation of the convex hook; the convex hook comprises a press-in wall, a connecting wall and an anti-falling wall which are sequentially distributed in the direction from the groove bottom of the guide groove to the groove opening.

The utility model belongs to the technical field of compressors, and discloses an air inlet structure of a compressor. The compressor comprises a compressor shell and an insertion pipe, an air inlet hole is formed in the compressor shell, the insertion pipe is installed in the air inlet hole and is in interference fit with the air inlet hole, a groove is formed in the inner wall of the air inlet hole, and a heat insulation cavity is defined between the groove and the insertion pipe; the problems that in the prior art, refrigerants are heated in advance in the process of entering a compressor, the size of the refrigerants is increased, and the efficiency of the compressor is reduced are solved.

The utility model relates to the technical field of blister boxes, and discloses a portable blister box which comprises a lower box body, an upper box cover and a lifting rope. A bending connecting plate is fixedly connected between the lower box body and the upper box cover, a connecting clamping groove is fixedly connected to the lower box body, a connecting buckle is fixedly connected to the upper box cover, and the connecting clamping groove and the connecting buckle are in interference fit with each other; edge lugs are fixedly connected to the two sides of the lower box body, fixing cylinders are fixedly connected into the edge lugs, hanging grooves are formed in the outer sides of the fixing cylinders, elastic buckle plates are installed in the hanging grooves, and the lifting ropes are arranged in the fixing cylinders. According to the plastic uptake box, a set of hanging grooves are additionally formed in the two sides of the plastic uptake box in the mode that the side lugs are installed on the two sides of the plastic uptake box, at the moment, a worker can twist the preservative film into the carrying rope, the carrying rope is knotted at the two ends of the carrying rope, and therefore the plastic uptake box is convenient to use. The carrying rope and the hanging groove are mutually assembled, so that the handle is additionally arranged on the blister box, and the blister box is convenient to carry by people.

The utility model relates to an end cover, a flow collecting assembly and a heat exchanger. The end cover has an axial direction and a radial direction; the peripheral wall of the end cover is used for being inserted into the inner wall of the end part of the collecting pipe, and the end cover has an axial direction and a radial direction; the end cover is provided with a first end part and a second end part along the axial direction; the size of the peripheral wall of the end cover in the radial direction is gradually increased from the first end to the second end in the axial direction, the peripheral wall of the first end is used for being in clearance fit with the collecting pipe, and the peripheral wall of the second end is used for being in interference fit with the collecting pipe or abutting against the end face of a pipe opening of the collecting pipe. The first end part is in clearance fit with the collecting pipe so as to avoid difficulty in initial assembly; and the second end part is in interference fit with the collecting pipe, so that the end cover can form an axial limiting function through the second end part during assembly, and the end cover cannot slide towards the interior of the collecting pipe to generate inward sinking. In conclusion, through cooperation of the first end portion and the second end portion, rapid assembly of the end cover is promoted, assembly inward sinking is avoided, assembly is simpler and more reliable, and efficiency is improved.

This utility model discloses an automatic circuit board testing device, including a base and a support. The support has a crossbeam and a vertical support. The crossbeam is equipped with a vertical moving mechanism that drives a detection positioning plate to move up and down. The vertical support has a guide mechanism that slides with the detection positioning plate. The detection positioning plate has several circular holes for placing detection probes or detection seats. The circular holes are arranged in a matrix and have annular grooves inside. The annular bosses on the detection probes or detection seats are interference-fitted with the annular grooves for fixation. The vertical moving mechanism can adopt a wrench drive or a bushing structure. The guide mechanism includes a guide post that fits with a through hole or a groove that fits with a boss. The device also includes a transition plate and a transition hole on the base. This device achieves automated testing through mechanical structure design, improving efficiency and accuracy, and has the advantages of strong versatility and convenient maintenance.