122results about How to "Eliminate fit gaps" patented technology

The invention disclose a mechanical processing positioning device, which comprises a base (1), an adjusting support assembly and an adjustable clamping mechanism, wherein the adjusting support assembly comprises a cylindrical taper pin (5), a compression spring A (6) and a screw plug (7), the cylindrical taper pin (5) is arranged in an inner cavity (2), the adjustable clamping mechanism comprises an adjusting screw rod (10), a press plate (11) and a compression spring B (12), the press plate (11) and the compression spring B (12) are sheathed outside the adjusting screw rod (10), and the adjusting screw rod (10) penetrates through a through hole (3) arranged on the base (1) and is fixed by a locking screw bolt (16). The mechanical processing positioning device has the beneficial effects that the diameter of the large end of a cone front part (8) is greater than the diameter of a blank hole, the wider positioning range is realized, the cylindrical taper pin (5) is tightly matched with the blank hole by the adjusting support assembly via the extension and retraction of the compression spring A (6), the influence of size and roundness errors of the blank hole can be overcome, the matching clearance is eliminated, and the positioning error is greatly reduced.

The invention relates to a linearly-reciprocating piston compressor, belonging to the filed of the compressor. The linearly-reciprocating piston compressor comprises a crank pin, a connecting rod, twopistons and two air cylinders; the two pistons and the two air cylinders are distributed oppositely; the two pistons are arranged in the air cylinders and are matched with the air cylinders in a sliding way; two ends of the connecting rod are respectively connected with the two pistons; the middle part of the connecting rod is provided with two parallel guide rails and an auxiliary connecting rod; the ends of the auxiliary connecting rod are provided with shaft pins; rollers are rotationally sleeved on the shaft pins; and the rollers are matched with the guide rails in a rolling contact way.One of the two guide rails is used for driving one piston to carry out compression stroke, the other guide rail is used for driving the other piston to carry out air inlet stroke, and the two guide rails work alternatively, thus the match clearance between the rollers and the guide rails can be effectively reduced or fully eliminated, the rollers are kept contacting the guide rails in a rolling way, the friction between the rollers and the guide rails is mitigated, and the noise from the impact of the rollers and the guide rails is reduced. The linearly-reciprocating piston compressor can be used for producing the compressor, the vacuum pump, the hydraulic pump and the water pump.

The present invention discloses a coaxiality detection method. The coaxiality detection method is characterized in that a standard workpiece corrects an axis of a rotating shaft, so that a pointer of a measurement instrument points to a zero; after the rotating shaft is corrected, the position coordinate of a probe is used as a detection reference point, and the position of the probe is fixed and constant; an end hole of a to-be-detected workpiece sleeves on the rotating shaft, the inner wall of the other end of the to-be-detected workpiece is contacted with the probe of which the position is fixed and constant via an adjusting device, and the pointer of the measurement instrument is observed whether to point to the zero; if the pointer points to the zero, the situation that the two end holes of the to-be-detected workpiece are coaxial is indicated; if the pointer deviates the zero, the situation that the two end holes of the to-be-detected workpiece exist a coaxiality error is indicated. During the measurement process, if the pointer of the measurement instrument points to the zero, the two end holes of the to-be-detected workpiece are coaxial, and the whole detection step is simple and is easy to operate. The measurement instrument probe is contacted with the inner wall of the other end hole of the to-be-detected workpiece directly, so that the pointing accuracy of the pointer of the measurement instrument is guaranteed, the whole detection method is high in accuracy, and an accumulated error is small.

The invention discloses a mechanical expansion shaft of air control C-shaped rings, which is used for metal and non-metal foil and a film-shaped coiled material and is suitable for production of an aluminium strip and foil. In order to solve the problem of compressibility of an expanded strip, no foundation in friction of an slope expansion block and low precision and structural strength in the existing gasbag type and slope-to-slope type mechanical expansion shaft, the invention provides a novel slope-to-round structure with automatically retracting capacity to replace the typical slope-to-slope old-fashioned structure; the novel slope-to-round structure comprises a main shaft pipe and an expansion mechanism; a plurality cone-shaped wedge pipes and a plurality of C-shaped rings are symmetrically sleeved on the expansion mechanism; and propulsion of the cone-shaped wedge pipes in opposite directions lead the C-shaped rings with a plurality of anti-skidding blades on the conical surface in a sleeving way to expand outward, so as to become secondary mechanical increasing force to tightly clamp a core rolling pipe. According to the invention, the slope-to-round structure is small in radial size, so that the strength of the expansion shaft is enhanced; the radial run-out error of the shaft is reduced due to disappearance of gaps between the blades and the shaft during the clamping; and the mechanical expansion shaft is applicable to the production for rolling thick pipe cores in wide roll width.

The invention relates to a closed type portal high-speed punch press stand which comprises a table body (1) used as a main working part on the upper part, a lubricating oil channel (2), an oil tank (8), a crankshaft tilting fillet (3), a bolt (4) and a hard thickening flat washer (5), wherein the bottom of the crankshaft tilting fillet (3) is a plane and is positioned on a corresponding plane in the table body (1) and fixed through the bolt (4) and the hard thickening flat washer (5); the lubricating oil channel (2) is distributed on the inner wall on the periphery of the punch press stand, and the upper part of the lubricating oil channel (2) is communicated with a top box (9), while the lower part is communicated with the oil tank (8); both sides at the bottom of the top box (9) are provided with a hole channel (10) communicated with the top box (9) and the lubricating oil channel (2); the bolt (4) is a grade-12.9 high-strength bolt; and the hard thickening flat washer (5) is flat washer chamfered grade A with a hardness grade of HV300. The invention can solve the problems of large mounting difficulty of the crankshaft tilting fillet, high processing expense and device lubricating oil return in the prior art.

The invention discloses an anti-loose thread fastening structure which comprises a bolt and a nut matched with the bolt, wherein variable angle oblique planes are arranged at the root of an internal thread of the nut, and the included angle between each variable angle oblique plane and a bisector of a thread angle of the internal thread is larger than a half of the thread angle of the internal thread. Threads of each pair of matched bolt and nut can be sufficiently contacted and interacted in the spinning length of the anti-loose thread fastening structure, so that load can be uniformly distributed, the stress structure is more balanced, the working life of the structure is prolonged, and the condition that the fastening effect is weakened early and even lost due to fast abrasion damage caused by overlarge local stress of an ordinary screw pair is avoided; and besides, the thread matching gaps between the threads of the bolt and the nut can be eliminated by means of the variable angle oblique planes of the nut, so that the bolt and the nut can be tightly matched in a longer spinning length, higher anti-loose torsional moment can be produced, and an ideal fastening effect can be kept on the use occasion with frequent vibration.

The invention discloses a speed reducer with an anti-backlash structure. The speed reducer with the anti-backlash structure comprises a speed reducer outer shell and a gear transmission mechanism. The gear transmission mechanism comprises an input shaft, a middle shaft and an output shaft, wherein the input shaft is provided with a first bevel gear, the middle shaft is provided with a second bevel gear and a third bevel gear engaged with the first bevel gear, and the output shaft is provided with a fourth bevel gear engaged with the third bevel gear. A first butterfly spring used for applying axial thrust force on the first bevel gear is arranged between the first bevel gear and a bearing. A second butterfly spring used for applying axial thrust force on the fourth bevel gear is arranged between the fourth bevel gear and the bearing. According to the speed reducer with the anti-backlash structure, when the gears are abraded, the butterfly springs automatically push the first bevel gear and the fourth bevel gear to move in the axial direction, and therefore a gear matching gap caused by friction abrasion is eliminated. The problems of increase of noise and impact force on the gears and the like caused by the increase of the gear matching gap can be avoided.

The invention relates to a spherical joint pair with low friction and no gap, an assembly method and application thereof, and belongs to the technical field of multi-degree of freedom mechanism and micro-transmission control. The spherical joint pair is a very effective transmission mode to realize multi-degree of freedom motion in a single joint. The manufacturing technology and cooperation of the spherical joint pair directly affect the transmission accuracy and efficiency of a joint. By using the close cooperation between a non-metallic material-polytetrafluoroethylene and a metal ball headconnecting rod, the ball joint transmission with low friction, no gap and high reliability is realized.

The invention discloses a display panel and a preparation method thereof. A support structure is arranged in the display panel, and the support structure is used for supporting a bent section of the display panel. The supporting structure comprises a first supporting part and a second supporting part. The second supporting part is manufactured on the surface of the first supporting part and the side edge of the first supporting part through the additive printing technology, so the manufacturing process of manufacturing the supporting part through machining and then attaching the supporting part to the corresponding position of the display panel is simplified, the attaching gap is eliminated, and the bent section of the display panel can obtain the more complete supporting effect.

A silk-screen printing fixture comprises a bottom plate and a pressing mechanism, wherein a cavity which can be in clearance fit with a to-be-printed piece is formed in the bottom plate; the bottom plate comprises a first inner wall and a second inner wall which are opposite; a slide way groove is formed in the first inner wall; the pressing mechanism is glidingly arranged in the slide way groove and is propped against the to-be-printed piece; and the pressing mechanism tightly presses the to-be-printed piece and tightly attaches the side surface of the to-be-printed piece to the second inner wall. When the silk-screen printing fixture is required for printing patterns, such as a window or keys and the like, on the to-be-printed piece such as a piece of glass of a cover plate of a mobile phone, the to-be-printed piece is placed in the cavity formed in the bottom plate, and the pressing mechanism tightly presses the to-be-printed piece to the second inner wall opposite to the first inner wall, so that the influences of fit clearance on positioning of the to-be-printed piece is reduced, the fit clearance between the silk-screen printing fixture and the to-be-printed piece can even be eliminated, the positioning accuracy of the window, the patterns and the like of the to-be-printed piece is improved, and accurate positioning is realized.

The invention relates to the field of bushing assembly, in particular to a high-precision bushing assembly centering device and a bushing centering assembly method. The device is a simple auxiliary tool, and comprises a centering shaft, a supporting shaft sleeve, a bushing supporting device and a shaft seat hole supporting device. The device is ingenious in structure and easy to control, and is tightly matched with a bushing and a shaft seat when used for guiding bushing assembly, so that the fit clearance is eliminated, the coaxiality between the bushing and the shaft seat is remarkably improved, and the bushing assembly quality is remarkably improved; and the use requirements of bushings and shaft seat holes with different diameters can be met by adjusting the bushing supporting device and the shaft seat hole supporting device, and the technical scheme has high universality.

The invention discloses an anti-dumping valve. A valve body (1) is connected with a valve seat (2) to form a valve cavity (B); a cover-shaped floater (3) is arranged above the valve seat (2); a steel ball (4) which can move freely and allow the floater (3) to move up and down in the valve cavity (B) is placed between the floater (3) and the valve seat (2); a rubber sealing ring (5) is mounted on an external wall of the valve body (1) in an embedded manner; a mounting surface of the rubber sealing ring (5) is higher than the valve seat (2); in addition, an outer ring of the floater (3) is provided with an isolation cylinder (23) protruding upwards from the bottom of the valve seat (2); a second air vent (21) is formed close to the lower edge of the rubber sealing ring (5); and the valve body (1) is connected with the valve seat (2) by an elastic buckled structure perferably. According to the anti-dumping valve, since the isolation cylinder is adopted, and the position of the second air vent is changed, accident closing of the anti-dumping valve can be avoided, the anti-dumping valve has a better leakproof effect; and with the adoption of the elastic buckled mode, the dimensional precision and production efficiency are improved.

The present invention provides an ultraviolet sterilization apparatus for water heaters. The ultraviolet sterilization apparatus comprises: a housing provided with a water inlet and a water outlet; a bushing arranged inside the housing; a sealing sleeve arranged inside the housing and positioned on the left end of the housing, wherein the left end of the bushing is received inside the sealing sleeve; a first sealing ring arranged between the outer peripheral wall of the bushing and the inner peripheral wall of the housing; an ultraviolet sterilization lamp tube arranged inside the bushing; a plugging head connected to the right end of the housing; and a second sealing ring arranged between the outer peripheral wall of the ultraviolet sterilization lamp tube and the inner peripheral wall of the bushing. The ultraviolet sterilization apparatus according to the embodiments of the present invention has characteristics of simple structure and prevention of damage caused by collision shock.

The invention relates to the field of machining, in particular to a positioning pin. The positioning pin comprises a base and an adjustable clamping mechanism. The positioning pin is characterized in that a sliding groove is formed in the base; a cylinder capable of sliding in the sliding groove is arranged in the sliding groove; a compression spring is arranged at the bottom of the cylinder; and a circular truncated cone is arranged above the compression spring and is in sliding fit with the cylinder. The adjustable clamping mechanism comprises a blind hole in the base. An adjusting screw is fixedly arranged at the bottom of the blind hole. The adjusting screw is sequentially sleeved with an adjusting screw, a tubular body and an adjusting nut from bottom to top. A flat panel is arranged at the upper end of the tubular body. Sawteeth are arranged on the side, facing the sliding groove, of the tubular body and the lower surface of the flat panel. A vertical vent hole is formed in the circular truncated cone. The positioning pin is not affected by the size of a blank hole or the circularity error, the fit clearance between the blank hole and the positioning pin can be eliminated, positioning errors are reduced, and the positioning pin is convenient to use, capable of saving time and labor and firm in positioning.

An embodiment of the invention discloses an unplugging assistant device which is used for realizing plugging and unplugging of a module relative to a cabinet. The module comprises a first connector, and the cabinet comprises a second connector. The unplugging assistant device is characterized by comprising a fixing member and a wrench, the fixing member comprises a fixed portion, a connection portion and a moving portion in sequential connection, the fixed portion is used for being fixed on the module, the connection portion has elastic deformation ability, the wrench sequentially comprises aclamping portion, a rotating portion and a handle portion in sequential connection, the rotating portion is rotatably connected with the moving portion, the clamping portion is used for being matchedwith the cabinet, and the handle portion is used for driving the module to move relative to the cabinet under action of external force to enable the first connector and the second connector to be in inserting connection or break away from each other. The unplugging assistant device can eliminate matching gap without causing damage to the connectors. The embodiment of the invention further discloses a plug-unplugging component and communication equipment.

The invention discloses a speed reducer provided with an air cooling, oil collecting, lubricating and clearance eliminating structure. The speed reducer comprises a speed reducer shell, a gear transmission mechanism, an air cooling device and an oil collecting device. The air cooling device comprises a draught fan, an air filter and an oil-gas separator. The speed reducer further comprises a first belleville spring used for applying axial thrust to a first bevel gear and a second belleville spring used for applying axial thrust to a fourth bevel gear. The oil collecting device comprises a circular pipe body, a partition board, an oil storage cavity, an oil inlet and an oil outlet. According to the speed reducer, the gears and lubricating oil in the speed reducer shell are cooled through the air cooling device, and thus the problems that due to long-term working of the speed reducer, the temperature of the lubricating oil is increased, and the performance is reduced can be solved; in addition, when the gears are abraded, the belleville springs can automatically push the first bevel gear and the fourth bevel gear to move in the axial direction, and thus a gear fit clearance caused by frictional abrasion is eliminated; furthermore, the lubricating oil is carried into a gear engagement area through the oil collecting device to lubricate the gears, and thus the lubricating and cooling effects on the gears can be improved.

The invention relates to a fastening piece, in particular to a compound nut. The compound nut comprises a nut body and a outer sleeve, wherein, a penetrated internal thread is arranged on the nut body, a circular bead is arranged on the external diameter of the upper end of the nut body, the external diameter of the circular bead is larger than the internal diameter of the outer sleeve, a ratchet mechanism forming one-way meshing is arranged at the matching position between the nut body and the outer sleeve, and the ratchet mechanism is composed of one or more ratchet wheels arranged on the external diameter of the nut body and one or more ratchet wheels which are arranged on the internal diameter of the outer sleeve. The compound nut has the functions of fastening, anti-loosing and anti-unloading, and has the advantages of simple structure and strong practicability.

A dustproof optical backboard connector comprises a backboard connector and a daughter board connector, and the backboard connector and the daughter board connector are connected in a mutually inserted manner. The backboard connector comprises a seat shell and a seat dustproof door assembly, and the seat dustproof door assembly is arranged in the opening end of the seat shell. The daughter board connector comprises a head shell and a head dustproof door assembly, the head dustproof door assembly is arranged in the opening end of the head shell, and the head shell is inserted into the seat shell. The dustproof door assembly comprises a first dustproof door, a first reset assembly and a first pushing assembly, and the head dustproof door assembly comprises a second dustproof door, a second reset assembly and a second pushing assembly. According to the present invention, the first dustproof door blocks the opening of the backboard connector, and the second dustproof door blocks the opening of the daughter board connector, so that the connection sealing performance of the dustproof door and the connector is effectively improved, the fit clearance is eliminated, and external dust is prevented from entering.

The invention discloses a suspending method capable of preventing a suspending plate from shaking. The suspending method comprises the following steps that S1, a positioning plate is fixed to the upper surface of the suspending plate; S2, a clamping plate is placed on one side of the positioning plate to make the clamping plate be located between a left strip plate and a right strip plate; S3, theclamping plate is rotated to make the end, away from a vertical plate B, of a horizontal plate B be inclined downwards; S4, the clamping plate is inserted into a mounting through groove; S5, the clamping plate is rotated reversely to make the horizontal plate B be parallel to the positioning plate, the tail end, away from the vertical plate B, of the horizontal plate B abuts against the inner wall of a vertical plate A of the right strip plate, and the side, close to the left strip plate, of the vertical plate B abuts against the tail end of a horizontal plate A of the left strip plate; and S6, the top of the clamping plate is connected with a ceiling through a ceiling connection rod part. A mating gap between the positioning plate in a suspended state and the clamping plate is eliminated, synchronization between the positioning plate and the clamping plate is ensured, and then stability of a suspended buckle part suspended on the lower part of the ceiling is ensured.

The invention belongs to the field of passenger car trims, particularly relates to a connecting structure of passenger car armrest rods, and provides a novel adjustable armrest rod connecting structure. The novel adjustable armrest rod connecting structure comprises a fixed seat. The bottom of the fixed seat is fixed to a mounting face. A screw is arranged on the upper portion of the fixed seat. The bottom of an armrest rod is connected with a shaft sleeve. An internal thread is arranged in the shaft sleeve. The screw cooperates with the internal thread of the shaft sleeve. The armrest rod isfixed to the fixed seat through threaded connection, a fit clearance between the armrest rod and the fixed seat is eliminated, no colliding happens during operation, and the noise problem is solved. The armrest rod is fixed to the mounting face through the fixed seat, and connecting reliability is high. The mounting height of the armrest rod is adjustable and can be conveniently adjusted during actual mounting.