1564results about How to "Guaranteed concentricity" patented technology

The invention relates to a foreskin cutting and sewing device, belonging to the technical field of medical and surgical instruments. The foreskin cutting and sewing device comprises a pair of handle valves, a balance shifter, a scalpel shell provided with a shell cavity, a scalpel push disk provided with a scalpel cavity, a cover-type cutting scalpel, a balanus cap provided with a balanus cavity, and a nail cabin. The foreskin cutting and sewing device is characterized in that one end of the inside of the shell cavity of the scalpel shell, which faces the balance shifter, is provided with a shifting bar sleeve; a plurality of guide vanes are formed between the outer wall of the shifting bar sleeve and the inner wall of the shell cavity; a scalpel push shaft of the scalpel push disk is circumferentially provided with a plurality of guide vane guide grooves; a shifting bar seat cavity is formed in the cutting scalpel cavity of the scalpel push disk; a plurality of guide rib guide grooves are formed on the wall of the shifting bar seat cavity; a plurality of guide ribs are formed on the outer wall of the shifting bar seat; a shifting bar penetrates through the shifting bar sleeve; and the balance shifter is matched with the shifting bar sleeve in the position corresponding to a shifter matching cavity. The foreskin cutting and sewing device can ensure the concentricity of the balanus cap, scalpel push disk and scalpel shell, thereby ensuring the sewing effect of the surgical wound.

The invention provides a correction device and a correction method for an inner ring of an engine crankcase. The correction device comprises a correction clamp base, positioning pins and a pressure plate; the tooling surface of the correction clamp base is provided with a circular seam allowance, and the inner side of the seam allowance is provided with a circle of uniform positioning pin holes; and the middle section of the positioning pin has a round table step-shaped columnar structure, the taper of the round table of the middle section is as same as that of the inner ring of the crankcase, and the maximum diameter of the positioning pin enables the positioning pin inserted into the positioning hole not to interfere with a blade of the crankcase. The correction method comprises the following steps of: jointing the seam allowance of the crankcase and the seam allowance on the correction clamp base; inserting the positioning pins into the positioning pin holes, positioning the positioning pins and the inner ring of the crankcase in a two-section contact mode, and then fixing the crankcase on the correction clamp base through the pressure plate; welding the inner ring and the blade of the crankcase; and finally, pouring a glue layer into the inner side of the inner ring of the crankcase, and gluing the inner ring and the blade of the crankcase. The device and the method ensurethe concentricity of the easily-deformed inner ring and the outer crankcase and the ellipticity of the inner ring.

The invention provides a split type calibration target which cooperates with a target lens to be used as a measurement target when a laser tracker is utilized for calibrating a spatial distance indication error of a laser scanner. The split type calibration target comprises a target seat, a target lens bearing component and a sphere target component, wherein the target lens bearing component is provided with a taper shank, a connecting piece arranged on the taper shank and a target lens seat which is arranged on the connecting piece and used for being connected with the target lens through magnetic adsorption; and the sphere target component is provided with a sphere side taper shank, a three-dimensional regulating mechanism arranged on the sphere side taper shank and a sphere target arranged on the three-dimensional regulating mechanism, wherein the taper shank and the sphere side taper shank are morse taper shanks respectively, the morse taper shanks have the same size and tolerance,taper tips are arranged downward, a morse taper sleeve is arranged on the target seat, the taper tip of the morse taper sleeve is downward, an opening is upward, and the morse taper sleeve is matchedwith the taper shank and the sphere side taper shank. The invention also provides a calibration device provided with the split type calibration target and a method for calibrating the laser scanner by utilizing the calibration device.

The jacketed pipe prefabrication platform and prefabrication method of the present invention relate to the technical fields of petrochemical and chemical fiber equipment installation. Aiming at the problem that the prefabrication construction operation of the straight pipe section of the existing large-diameter jacketed pipe is relatively complicated and the work efficiency is low. It consists of a flange plate positioning frame, an inner tube positioning component and a number of outer tube positioning components; the adjustment rod set at the bottom of the positioning base can adjust the height of the flange plate; the inner tube positioning component is vertically fixed on the back plate The central rod, the telescopic guide wheel support frame sleeved on the central rod, and the support frame connected to the other end of the central rod, the telescopic guide wheel support frame is composed of a fixed sleeve sleeved on the central rod, along the central rod It is composed of a support rod with uniform radial axis and hinged with the fixed sleeve, and a telescopic bracket with one end hinged with the support rod and the other end connected with the central rod. The other end of the support rod is provided with a guide wheel; the outer tube positioning component includes a detachable Connect the outer tube bracket and the adjustment rod II.

The invention discloses an omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor, and belongs to the field of ultrasonic non-destructive testing. A double-layer spiral inflection coil structure is integrated in a flexible circuit board, and the omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor is designed and developed to excite single A0 modal Lamb waves in an aluminum plate. The developed electromagnetic acoustic sensor is verified by experiments, the single A0 modal Lamb waves can be excited in the aluminum plate, defects in the aluminum plate are detected by the sensor, and positioning precision is high. The developed electromagnetic acoustic sensor has fine frequency response characteristics according to verification by scanning frequency experiments, and the developed electromagnetic acoustic sensor has fine omnidirectional characteristics according to verification by omnidirectional characteristic testing experiments. By the aid of the developed omnidirectional A0 modal Lamb wave electromagnetic acoustic sensor and an array combination imaging algorithm thereof, wide-range and high-efficiency defect imaging of a plate structure can be realized, and the sensor has great application values and potentials in the field of health monitoring and non-destructive evaluation for the plate structure.

The invention discloses a hydraulic flexible cold-drawing method and equipment in the metallurgical mechanic pipe moulding technique, which comprises the following parts: pushing piston cylinder, pushing core bar cylinder, pushing assembly cylinder, assembly, rail, feeding structure, mould, blanking structure, clamp structure and drawing cylinder. The mould doesn't touch the deformation metal to form the flexible deformation state of mould-hydraulic oil-hollow billet-hydraulic oil-core head, which improves the precision of cold-drawing pipe.

The invention relates to a lock body automatic machining device which comprises a machine frame and a rotation disc component arranged on the machine frame. A plurality of sets of locating and clamping units are arranged in the circumferential direction of the rotation disc component and located on the machine frame. The periphery of the rotation disc component is provided with a locating feeding unit, a first automatic drilling unit, a hole position automatic detection unit, an automatic notching unit, an automatic groove milling unit, a second automatic drilling unit, a small hole automatic machining unit, a third automatic drilling unit and a discharging unit in the anticlockwise direction. The lock body automatic machining device is simple in structure and convenient to operate, whole-journey automation of lock body machining is achieved, concentricity of central hole forming of the lock body is guaranteed, meanwhile groove machining is achieved at one time, groove accuracy is guaranteed, production efficiency is greatly improved, labor intensity is lowered, cost is saved for enterprise production, and enterprise production efficiency is improved.

The invention discloses round stick processing machinery, wherein a processing cutter is fixed on the axle center position of a three-jaw chuck, a material passing hole matched with the diameter of a round stick is formed in the center, cutter teeth are arranged on the front end, feeding and clamping rollers are a pair of rollers provided with 90-degree V-shaped grooves located in the front end of the processing cutter and are used for conveying a batten to be processed, a material shifting wheel is located on the rear end of the processing cutter and is used for outputting a processed round stick, and material brackets used for supporting the batten to be processed and the processed round stick are respectively arranged on the front end of each feeding and clamping roller and on the rear end of the material shifting wheel. According to the round stick processing machinery disclosed by the invention, the processing cutter does not need to be adjusted, and processing cutters with different specifications are directly changed to process round sticks with different specifications. The round stick processing machinery disclosed by the invention can be used for processing a round stick with a minimal diameter of only 1 mm.

The invention discloses a hole guiding machine, comprising an upper plate, a lower plate, and at least two guiding elements arranged between the upper plate and the lower plate. The hole guiding machine is characterized in that the guiding elements comprise a guide column fixed on the lower plate and a guide bushing which is arranged at the corresponding position of the upper plate and used for connecting the upper plate and the lower plate so as to lead a cone-shaped positioning pin arranged on the upper plate to be concentric with a drilling guide sleeve arranged at the corresponding position of the lower plate. The hole guiding machine can better ensure the perpendicularity of the guided hole and the part surface and the concentricity of the guided hole and the guide hole by the guiding function of the guide bushing, and no slant holes can be guided out, thus improving the product quality. Ends of the upper plate and the lower plate are provided with a distance adjusting device arranged between the upper plate and the lower plate, thus leading the hole guiding machine to be applicable to guiding holes on various parts with different interlining thickness.

The invention provides an engine outer duct casing welding device and method. The device comprises a base, an upper-layer pressing ring, a middle-layer expansion ring, a supporting plate, a lower-layer expansion ring and a movement device. Welding deformation is reduced by adopting the sectioning expansion structure, and the overall concentricity of a to-be-welded workpiece is ensured. The sectioning expansion structure is mainly composed of a wedge block, a supporting plate, a driving block, a driven block and the like. In the expansion process, the wedge block is moved downwards, therefore,the driving block is moved outwards, and the driven block is driven till being in tight fit with the part.

The invention is a twin-stage axial flow blower. It is characterized in that cone axile bush fixed on the two terminals of two-axle electric engine. Cooling pipe in cooling device installed between external and middle tube. One end of the pipe connects to exotic environment of electric engine in middle tube. Static guide blade fixed behind primary impeller. Current collector fixed in front of primary impeller which connects to one end of two-axle electric engine. Diode impeller connects to the other end of the engine. Stayed plate fixed between external and middle tube. Footing installed on the bottom of external tube. Because of the self-locking of cone axile bush, it can axial lock impeller and axle of electric engine effective. It can confirm concentricity of axial direction and make installment and disassembling convenience, increase assembled accuracy. Suction pressure gas flow created by revolution of diode impeller can achieve effectiveness. It has characteristics of simple structure, proper design, steady performance, low cost, denoise, and energy-saving etc.

The invention discloses a stepless adjusting device applicable to the lengths of four limbs of a rehabilitation robot. The stepless adjusting device comprises a fixed rod, a slide rod and a stepless adjusting mechanism. The stepless adjusting mechanism comprises a bevel gear shaft system and a lead screw pair transmission shaft system. The bevel gear shaft system comprises a bevel gear shaft and two meshing bevel gears. One end of each bevel gear is mounted in a groove, the other end of each bevel gear extends out of the fixed rod, and rotary operation portions are formed at the other ends of the bevel gears. One of the bevel gears is coaxially fixed to the bevel gear shaft and can be driven by the bevel gear shaft to rotate. The lead screw pair transmission shaft system comprises a lead screw shaft, a lead screw deep groove ball bearing and a nut. One end of the lead screw shaft is coaxially fixed to the other bevel gear, the other end of the lead screw shaft is screwed with the nut and extends into the slide rod via the nut. The lead screw deep groove ball bearing is matched with the lead screw shaft and is mounted between the inner side walls of the grooves and the lead screw shaft. Rotary force of the operation portions of the bevel gear shaft can be transmitted onto the lead screw shaft by the aid of meshing of the two bevel gears, and the nut can be ultimately driven to drive the slide rod to move relative to the fixed rod.

The invention discloses a seamless vacuum cup and a machining method thereof. The machining method comprises the following steps: bending the upper end of an opening part of a stainless steel liner to the outer side to form a folding part; feeding the stainless steel liner into a stainless steel shell and sleeving the outer side of a drooping edge of the folding part on the upper end part of the opening part of the stainless steel shell; fusing and welding the end of the upper end part and a bent corner of the upper end of the drooping edge to form a whole body by argon-arc welding; and a polishing treatment step: carrying out polishing treatment on the outer surface of a welding part. The seamless vacuum cup machined by the method comprises a cup body and a cup cover, wherein the folding part which is bent toward the outer side is formed at the upper end part of the opening part of the stainless steel liner and the drooping edge of the folding part sleeves the upper end part of the opening part of the stainless steel shell; and the end of the upper end part and the bent corner of the upper end of the drooping edge are welded through the argon-arc welding to form an integrated structure. With the adoption of the seamless vacuum cup and the machining method thereof, the technical difficulty of seamless connection of the shell and the liner of the vacuum cup is solved, the sealing property and the whole intensity of the vacuum cup are improved, and the welding is more convenient and efficient.

An efficient positive displacement motor under a well comprises a bypass valve assembly, a falling prevention joint, a motor joint, a universal joint assembly and a bearing joint assembly. The efficient positive displacement motor under the well is simple in structure, convenient to use, stable in operation under the well, safe, reliable, high in complete machine efficiency, capable of outputting larger torque, long in working time and service life, suitable for drilling needs of various complex wells at the present, free of piercing leakage and high in working reliability. A streamlined flow channel enables water conservancy losses of a main flow channel to be reduced, turn-off force is large, the defects of the interference effect and tooth form distortion of the conjugation curvature of a traditional single-screw machine type positive displacement motor are overcome, a universal shaft operates flexibly, energy efficiency is high, the universal shaft can work in the environments where no sand grain exists, and drilling fluid erosion exists, the service life is long, and mechanism strength is high.

The invention discloses a straight-flow steam generator which comprises a shell and a plurality of heat exchange tubes. The shell is sequentially divided into an oil inlet chamber, an oil outlet chamber, a preheating chamber, an evaporating chamber, a dehumidifying chamber and an overheating chamber from bottom to top, a heat transfer oil inlet is arranged on the oil inlet chamber, an inner tube plate is arranged between the oil inlet chamber and the oil outlet chamber, a heat transfer oil outlet is arranged on the oil outlet chamber, an outer tube plate is arranged between the oil outlet chamber and the preheating chamber, a feed-water inlet is arranged on the preheating chamber, a steam outlet is arranged on the overheating chamber, each heat exchange tube comprises an inner tube and an outer tube, the bottom end of each inner tube extends into the oil inlet chamber and is fixed onto the inner tube plate, the top end of each inner tube extends to the upper portion of the corresponding outer tube, the bottom end of each outer tube extends to the oil outlet chamber and is fixed onto the outer tube plate, the top end of each outer tube is provided with a closed structure and extends to the overheating chamber, and each inner tube and the corresponding outer tube form an interlayer structure. The straight-flow steam generator effectively solves the problem of poor heat expansion, and has the advantages of stability, reliability, safety, high heat exchange efficiency and the like.

The invention discloses a concave-convex annular sealing structure with flanges, which comprises two pipe ends, two flanges sleeved on the pipe ends, sealing pieces and fasteners, wherein each flange comprises an inner end surface and a through hole. The sealing structure is characterized in that an inner concave part is arranged on the inner end surface of each flange in a position near the periphery of the through hole; the sealing pieces are two composite linings arranged in the inner concave parts and embedded in the pipe ends, and can be in tight contact with each other after the flanges are fastened through the fasteners; and at least one convex sealing ring is arranged on one of the contact surfaces of the sealing pieces. The sealing structure has the benefit effects that the concentricity of connected pipelines can be guaranteed; the composite linings can not protrude radially due to over extrusion; and the sealing effect can be achieved on the condition that no shear stress is generated.

The invention relates to an epoxy-pouring full-insulation solid isolating switch, which comprises an isolation body, a grounded contact, an isolation contact, a middle contact, an isolation moving contact, a driving screw rod, a fixed nut and a driving gear part, wherein the grounded contact and the isolation contact are arranged at two ends of the isolation body respectively, the middle part of the isolation body is provided with the middle contact, the upper end of the isolation contact is connected with a bus contact through a bus-bar, the bus contact is arranged on the top of the isolation body, and the isolation moving contact is always contacted with the middle contact through a watch chain sensing finger. The isolation switch slides between two positions of the middle contact and the isolation contact or the middle contact and the grounded contact to form the conduction or the isolation grounding of the isolating switch. The entire isolating switch is poured into a fully-sealed integral structure with epoxy resin.