63results about How to "Coaxiality error is small" patented technology

The invention discloses a wind power gear box fault diagnosis test platform based on multi-feature fusion and a method, solves the problems such as single detection method, a random wind load specialworking condition as well as oil change interference which are faced by wind power planet gear box fault diagnosis and has the beneficial effect of high fault diagnosis accuracy. A scheme is as follows: the test platform comprises a test bed base provided with a to-be-tested wind power gear box, a vibration acceleration sensor and a noise signal sensor are arranged at the circumference side of theto-be-tested wind power gear box, the circumference side of the to-be-tested wind power gear box is connected with an oil liquid information detection sensor, each sensor is respectively and independently connected with a data acquisition module, and an evaluation method can extract vibration feature indexes specific to random wind load working conditions, extract noise feature indexes and extract oil liquid feature indexes specific to oil change interference problems, so that a vibration-noise-oil liquid feature fusion evaluation model based on deep learning and DS evidence theory is built.

The invention relates to a dynamometer for an automobile chassis, aiming at solving the shortages that the existing dynamometer for the chassis has unstable detection data, low accuracy and poor reliability, is difficult to correctly evaluate the power performance of the vehicle and the like, and the defects that the dynamometer can not realize the compatibility of power performance detection function and emission inspection function. The invention provides a dynamometer for the automobile chassis, comprising a stander, an anti-drag motor, an eddy current machine, a force measurement sensor and a speed sensor arranged on the eddy current machine, and a pair of driving roller and driven roller linked to each other; two ends of the driving roller and the driven roller are rotatablely connected on the stander by a bearing respectively; the driving roller is connected with the eddy current machine and the anti-drag motor; and the force measurement sensor adopts a dual-range sensor. The invention provides a measurement and control method for the dynamometer used for the automobile chassis. The dynamometer for automobile chassis and the measurement and control method thereof have stable detection data, high accuracy and good reliability and can realize the compatibility of the power performance detection function and emission inspection function.

The invention discloses an electrically operated valve. The electrically operated valve comprises a valve plug base (1) which is provided with a valve plug cavity and a valve port (11) communicated with the valve plug cavity, and a valve needle (2) which is extended into the valve plug cavity and is matched with the valve port (11); a lead screw (3) is connected with the upper part of the valve needle (2); and a pilot sleeve (4) is arranged outside the lead screw (3) and is fixedly connected with the valve plug base (1). By the electrically operated valve, the concentricity between the pilot sleeve (4) and the valve port (11) can be improved so that the sealing performance between the valve needle (2) and the valve port (11) can be improved and the frictional resistance during rotation of a rotator (6) can be reduced. Moreover, the invention also discloses a heat exchange device comprising the electrically operated valve.

The invention relates to the field of workpiece grinding, in particular to the technical field of microbits for PCB machining, and discloses a device and method for manufacturing an integrated rotary cutting tool. The device for manufacturing the integrated rotary cutting tool comprises a workpiece transfer device, a machine body, a feeding device, a grinding device and a discharging device. The grinding device comprises a coarse grinding device body used for carrying out primary grinding on vertically-arranged workpieces and a fine grinding device body used for carrying out secondary grinding on the vertically-arranged workpieces. The device for manufacturing the integrated rotary cutting tool is adopted in the method for manufacturing the rotary cutting tool. According to the device and method for manufacturing the integrated rotary cutting tool, the device is compact in structure, high in machining efficiency and precision and low in cost, the maximum value, the minimum value and the average value of the roundness of the microbits and the maximum value, the minimum value and the average value of the concentricity of the microbits are closer to the standard values, the capability index of the roundness in the stabilization process can be 2.0242, the capability index of the concentricity in the stabilization process can be 2.6657, and the machining precision is remarkably improved.

The invention relates to a food cooking machine which comprises a host machine and a cup seat, wherein a cutter seat is arranged in the cup seat. The food cooking machine is characterized in that the joint of the cup seat and the cutter seat is provided with a vibration-proof pad or a soft rubber sleeve, and the cup seat and the cutter seat are matched and fixed by a screw or a clamping buckle; a stirring cup is arranged above the cutter seat, a sealing ring is arranged between the stirring cup and the cutter seat, the sealing ring and the cutter seat are in sleeve joint, and the stirring cup and the cutter seat are matched and fixed by a clamping buckle. A transmission rod is arranged in the cup seat, the corresponding position of the host machine is provided with a switching connecting rod, and a certain clearance is kept between the transmission rod and the switching connecting rod; the joint of the cup seat and the transmission rod is provided with a spring. By utilizing the elasticity of the vibration-proof pad and the spring, the invention improves the connection mode of the cutter seat, the stirring cup and the cup seat, reduces the coaxiality error of a knife assembly and a connector, achieves the aims of decreasing vibration and friction and lowering noise and also increases the service life of the food cooking machine.

The invention discloses a cabin section rapid pose adjusting and tensioning device based on a six-axis platform, and belongs to the field of missile cabin section butt joint, and the problem that thebutt joint cabin section is subjected to coaxiality adjustment and tension force application is solved. The cabin section rapid pose adjusting and tensioning device comprises a rotary clamping ring module and a tensioning module, the rotary clamping ring module is used for fixing the connection cabin section and adjusting the posture; and tensioning force is evenly exerted on the tensioning modulein the circumferential direction of the cabin section, and accurate and efficient butt joint of the cabin sections is completed. The cabin section rapid pose adjusting and tensioning device is suitable for the rapid and safe butt joint process between the guided missile cabin sections which are connected in a sleeved mode.

The invention relates to a two-way screw conveying device which comprises a speed reducing motor (1), a driving component (2), a discharge hole (3), a screw shaft (4), feeding holes (5), a hanger bearing (7), a housing case (9) and a driven component (10), and is characterized in that one section of the screw shaft (4) is provided with a positive spiral vane (60), and the other section of the screw shaft (4) is provided with a negative spiral vane (61); the two feeding holes (5) are respectively positioned at the tail ends of the two sides of the positive spiral vane (60) and the negative spiral vane (61); and the discharge hole (3) is positioned between the positive spiral vane (60) and the negative spiral vane (61). The screw shaft is welded with the two sections of vanes with the opposite screw directions, so that lead powder arranged at the two ends of the screw shaft can be conveyed into a middle powder outlet and then is output when the screw shaft is driven to rotate by the motor. The two-way screw conveying device has the advantages that the screw length is reduced, the material is saved, and the cost is reduced; meanwhile, as the screw length is reduced, the screw operation is more reliable.

The invention discloses an integrated injection molding rotor and a stepping motor applied to automatic control. The integrated injection molding rotor comprises a magnet ring, a rotating shaft, an injection molding body arranged between the magnet ring and the rotating shaft to facilitate that the injection molding body makes the rotating shaft and the magnet ring into a whole. The rotating shaft and the magnet ring are made into the whole through injection molding, the rotor manufacturing precision is greatly improved by arranging a speed-reducing grooved cavity and a special gate position, the machining process is simple, the made rotor assembly is small in coaxiality error, stable in quality and high in reliability, the positioning accuracy of the BY series stepping motor is remarkably improved, product noise is reduced, torque pulsations are decreased, the motor efficiency is improved, and the BY series stepping motor can be widely applied in special working and medical treatment automation equipment driving occasions having higher requirements and the field of automatic control.

The invention discloses an installation structure of a radial magnetic bearing and a radial sensor and an installation method of the installation structure of the radial magnetic bearing and the radial sensor. The installation structure is characterized in that the radial magnetic bearing comprises an upper pressing plate, a lower pressing plate and silicon steel sheets, wherein coil frameworks are respectively installed on the inner side surfaces of the silicon steel sheets; coils are respectively intertwined on the coil frameworks; after the external circular arc surfaces of the silicon steel sheets are surrounded, the external cylindrical surface of the radial magnetic bearing is formed; after the inner side tail ends of the coil frameworks are surrounded, the internal cylindrical surface of the radial magnetic bearing is formed; the upper pressing plate comprises an upper step, a middle step and a lower step; a circular hole is formed in the middle of the upper pressing plate; a plurality of through holes are uniformly formed at intervals in the periphery of the round hole in the upper step; a plurality of groups of penetration holes are formed in the lower step; two outmost holes among the penetration holes are pin holes; the pin holes are also formed in the places, corresponding to the pin holes in the upper pressing plate, of the lower pressing plate; cylindrical pins are arranged in the pin holes in the lower pressing plate and the pin holes in the upper pressing plate in a penetrating mode; a magnetic bearing circuit board is arranged on the middle step; after the radial sensor is placed in the through holes, the tail end thereof is electrically connected onto the magnetic bearing circuit board.

The invention relates to the field of bearing test devices, and particularly relates to a bearing test device. The bearing test device comprises a test head component which comprises left and right bushings. The test head component also comprises a positioning bushing. The positioning bushing and the left and right bushings are coaxially fixed. Centering and positioning of the left and right bushings are performed through the positioning bushing in assembling so that the coaxiality of the left and right bushings can be guaranteed, then the coaxiality of left and right test bearings can be guaranteed and the coaxiality error of the left and right test bearings can be reduced. Compared with the present bearing test device that the left and right bushings are fixed on a base, the coaxiality of the left and right bushings can be guaranteed by the positioning bushing of the bearing test device so that the coaxiality precision of the left and right test bearings can be enhanced, and the problem that the present bearing test device cannot be suitable for miniature bearings can be solved.

The invention discloses a die construction, which is characterized by the following: one top die which is composed of one upper bolster, one top die seed and one breaker wherein the upper bolster has one open and the surrounding open installs a plurality of adjustment hole; one top die seed is fit for the open of upper bolster; one breaker has a via hole in the middle, the surrounding via hole installs a plurality of adoption hole, the via hole of breaker is alignment to open axial trace of upper bolster; one counterdie which is composed of one die shoe, one counterdie seed and screw, wherein the counterdie installs one open in the middle; one counterdie seed is fit for the open of counterdie; the screw is fit for adjustment hole of upper bolster and adaption hole of breaker.

The invention relates to a centerless super-fine grinding and polishing processing device for precise shaft parts. The device comprises a base and columns, the columns are fixedly installed on the plane of the top of the base, and the plane of the top of the base is provided with a horizontal movement mechanism; a guide roller rotation driving mechanism is installed on the plane of the top of thehorizontal movement mechanism, a grinding head lifting mechanism is fixedly assembled on the end face of one side of each column, the plane of the outer side of a beam of each grinding head lifting mechanism is provided with a grinding head tilting swing mechanism, and output ends of the grinding head tilting swing mechanism are provided with a grinding and polishing processing device body. According to the centerless super-fine grinding and polishing processing device for the precise shaft parts, a centerless processing principle is adopted for super-fine grinding and polishing of the shaft parts in a step-shaped irregular appearance, the geometrical shape errors of the outer contours of the shaft parts are corrected, the surface roughness of the shaft parts is lowered, the microcosmic surface texture is changed, and high precision of the geometrical shapes and surface quality of the precise shaft parts is guaranteed.

The invention relates to a water tank welding device. The water tank welding device comprises a middle clamping mechanism and two side clamping mechanisms with a same structure. The two side clampingmechanisms are used for clamping the upper half section and the lower half section of a water tank to be welded correspondingly and symmetrically arranged at the left end and the right end of a bottomplate. Each side clamping mechanism comprises an outer ring and a spring clamping device capable of transversely moving and pushing along with a first pushing air cylinder, wherein the outer ring isfixed to a first support, a spring sliding groove is formed in the inner wall of the outer ring, and the middle of the lower end of the first support is connected with an output shaft of the first pushing air cylinder. The middle clamping mechanism is used for clamping the middle section of the water tank to be welded and comprises an arc clamping device. The arc clamping device comprises an upperhalf ring and a lower half ring, wherein one end of the upper half ring and one end of the lower half ring are hinged through a hinge, the upper half ring and the lower half ring are in a round pipeshape after being closed, the inner diameter of the round pipe is matched with the outer diameter of the middle section, and the central axis of the round pipe is flush with the circle center of eachclosed arc plate of the two side clamping mechanisms. The coaxiality error of the three sections of the water tank is reduced, and the clamping time is saved.

The invention relates to a mounting system special for accurately machining two supporting holes of an elastic tube assembly and a method. The mounting system special for accurately machining two supporting holes of an elastic tube assembly comprises a workpiece initial mounting mechanism, a rapid searching mechanism and a connecting and equalizing mechanism, wherein the workpiece initial mounting mechanism comprises an initial searching element, a supporting plate and a clamping mechanism and clamps the elastic tube assembly arranged on the searching element; the rapid searching mechanism comprises a searcher, a searching element, a searching characteristic surface matched with the searcher on the workpiece initial mounting mechanism and a pneumatic clamping mechanism, the workpiece initial mounting mechanism is matched with the searcher through the searching characteristic surface and the searching element thereon so as to rapidly and accurately position the whole workpiece / clamp on a machine tool and machine large holes and outer conical surfaces; and then the initial mounting mechanism is taken down to be remounted on the searcher again to machine small holes. By mounting a workpiece outside the machine tool, the invention can greatly improve the mounting efficiency and the reliability of the workpiece and decrease the coaxiality error from 0.04 to 0.02.

The invention relates to the technical field of metal milling devices, and discloses an indexing positioning right-angle milling head. The milling head comprises a shell, a vertical shaft, a bevel gear unit connected with the vertical shaft, a horizontal shaft which is connected with the bevel gear unit and is vertical to the vertical shaft, a vertical shaft lifting device and a vertical shaft bearing seat tightening device, wherein a vertical shaft bearing seat can rotate in a vertical shaft shell; and by the vertical shaft bearing seat tightening device, the horizontal shaft in the shell, a shaft element of the horizontal shaft and the vertical shaft bearing seat are driven to rotate through a horizontal shaft shell by taking the vertical shaft as an axis. The milling head has the advantages of high indexing accuracy of a right-angle milling head, accurate indexing accuracy, time saving and labor saving in the indexing process, high equipment rigidity and the like.

The invention relates to the technical field of metal milling devices and discloses a right-angle milling head for compensating coaxial errors. The right-angle milling head comprises a shell, a vertical shaft, a bevel gear unit and a horizontal shaft, wherein the vertical shaft is connected with the horizontal shaft at a right angle through the bevel gear unit; the vertical shaft and the horizontal shaft can be rotatably arranged in the shell through bearings; the vertical shaft comprises an upper vertical shaft, a lower vertical shaft, and an elastic coupling; the elastic coupling comprises an upper part and a lower part; a gap is formed between the upper part and the lower part; and the upper vertical shaft is coaxially connected with the lower vertical shaft through the elastic coupling. By the technical scheme, the work environment of shaft elements is improved, the transmission is stable, the service life of the equipment is prolonged, and the machining efficiency is improved.

The invention discloses a machine shell inner hole machining method, and relates to the technical field of machining. A machine shell inner hole machining clamp is used. The machine shell inner hole machining method comprises the following steps that A, a clamp is mounted, wherein a base of the machine shell inner hole machining clamp is fixed on a main shaft of a machine tool through a positioning tooth opening and a bolt penetrating through a plurality of stepped holes, so that an ejector rod driven by a hydraulic cylinder penetrates through a center hole of the main shaft to extend into thecenter hole of the base, and an ejector head is screwed at the end of the ejector rod through threads; B, a workpiece is loaded, wherein a machine shell is placed between the base and a pressing ring, so that a pin hole in the front end face of the machine shell is aligned with a positioning pin on the pressing ring; C, the hydraulic cylinder is started, so that the ejector rod drives the machine shell to move forward through the ejector head, and the front end face of the machine shell is connected with the pressing ring in a pressing mode; and D, the main shaft is started, so that the inner hole of the machine shell is machined through a tool on a tool tower of the machine tool. Compared with the prior art, the method can solve problem that the existing machining precision of the machine shell inner hole is poor.

The invention discloses a replaceable guide wheel assembly for a sand line cutting device. The replaceable guide wheel assembly for the sand line cutting device comprises a right bearing, a left bearing, a wheel shaft, an inner spacing sleeve, an outer spacing sleeve, a guide wheel hub, a locking washer, a locking nut, a gland and guide wheels. The guide wheel hub is supported on the wheel shaft through the right bearing and the left bearing; conical steps with large ends on the left sides are arranged on the right end of the guide wheel hub; guide wheel inner holes are conical holes with large ends on the left sides, are sleeved on excircles of the steps on the right end of the guide wheel hub, and are fixedly connected onto end faces of the steps on the right side of the guide wheel hub through screws; and a V-shaped guide wire slot is formed in the surface of an outer ring of each guide wheel. The replaceable guide wheel assembly for the sand line cutting device has the further improvement that an included angle alpha 2 at an opening part of the V-shaped guide wire slot in the surface of the outer ring of each guide wheel is larger than an include angle alpha 1 at the bottom of each slot. The replaceable guide wheel assembly for the sand line cutting device provided by the invention is high in guide wheel rotation accuracy, and high in sand line cutting accuracy and convenient to replace sand lines when being used.

The invention relates to a bottle preform injection molding model machining tool. The bottle preform injection molding model machining tool comprises a clamping part, an overhanging part, a tool bit and a blade which are sequentially connected, wherein the section of the clamping part is a circle, the diameter of the clamping part is 16 mm, the length of the clamping part is 70 mm, the section ofthe overhanging part is an oval with the long axis being 15 mm and the short axis being 10.5 mm, the maximum length of the overhanging part is 55 mm, and the distance from the tail end of the overhanging part to the front end of the blade is 80 mm; and the tool bit is welded to the front end of the overhanging part, the blade is installed at the front end of the tool bit, and the distance betweena tool nose of the blade and the axis of the tool is 5.25 mm. By using the machining tool, a ball head part of a whole cavity can be completely turned by using a turning tool, so that the machining procedure of a machining center is omitted, and the machining time is greatly saved. Meanwhile, the coaxiality error (the precision is 0.005mm) generated by two times of clamping can be reduced, the grinding allowance of an universal grinder during finish machining is further reduced, the machining time is saved while the working procedures are reduced, the cost consumed by the tool is reduced, andtherefore the efficiency of the whole technological process is improved.

The invention discloses a running-in device suitable for a micro-small ball screw pair and a running method thereof. The running-in device comprises n sets of headstocks, a lathe bed, n sets of worktables, n sets of tailstocks, and a motor. Wherein the lathe bed comprises a base and a panel, and the panel is vertically arranged on the upper surface of the base; n sets of guide rails with a first slider and a second slider vertical to the upper surface of the base are arranged on one side of the panel; on each set of guide rails, the corresponding tailstock and worktable are coaxially arrangedfrom the end far from the base; and the tailstock and the workbench are respectively arranged on the first slider and the second slider; the headstock and the tailstock and the worktable on each set of guide rails are coaxially arranged on the upper surface of the base; the motor for driving the movement of the headstocks is arranged on the side of the base, and a motor timing pulley is arranged on the motor. According to the running-in device suitable for the micro-small ball screw pair and the running method thereof, the running-in of a plurality of micro-small ball screw pairs can be realized at the same time, the efficiency of the running-in is high, a vertical structure is adopted, the structure is simple, the coaxiality error of the headstocks and the tailstocks, and running-in screwdeflection can be reduced.

The invention discloses a welding device for a rotating shaft and an end plate of a pepper stem cutting machine. The welding device comprises a bottom frame. An annular frame is arranged at the upperend of the bottom frame. Three sliding plate guide grooves uniformly distributed in the circumferential direction are formed in the annular frame. An end plate centering mechanism is arranged in one sliding plate guide groove and comprises sliding plates. The sliding plates are slidably arranged on the sliding plate guide groove and are provided with inclined holes which are oblique outwards. Electric rotating tables are fixed to the annular frame and are used for fixing column pins. The column pins slide in the sliding plate guide grooves. The sliding plates are used for fixing centering frames. The centering frames are rotatably provided with end plate entering and upper and lower side clamping mechanisms. The clamping mechanisms rotatably support the end plate. A rotating driving mechanism is fixed to the bottom frame and used for driving the end plate to rotate. An annular welding mechanism is fixed to the annular frame and is used for annularly welding the end plate and the rotating shaft. A rotating shaft sleeve is fixed to the bottom frame and is in clearance fit with the rotating shaft. The rotating supporting and positioning of the end plate and the positioning of the rotating shaft are realized. The coaxiality of the end plate and the rotating shaft is improved.

The invention discloses a stepping motor applied to automation control. The stepping motor comprises a rotor and a motor stator assembly, wherein the rotor is supported on the motor stator assembly rotatablely; the motor stator assembly comprises an outlet box and two stator sub-assemblies assembled together, and each stator sub-assembly comprises a middle polar plate, a coil block and a main case; a main case base is formed at one end of the main casing, the other end of the main case is opened, a seam allowance part coaxially arranged together with the rotating shaft of the main case is arranged at the opening end of the main case, and a notch is further formed in the opening end of the main case; a protruding part corresponding to the notch and protruding outward in the radial direction is arranged on the middle polar plate; the rotor comprises a magnet ring, a shaft and an injection molding body, wherein the injection molding body is arranged between the magnet ring and the shaft, so as to enable the rotating shaft and the magnet ring to be integrated by the injection molding body. According to the stepping motor provided by the invention, not only the shaft and the magnet ring are integrated through injection molding, but also the manufacturing accuracy of the rotor is improved, accumulated errors caused during stator assembly assembling are reduced, and the datum reference is kept to be consistent.

The invention relates to a fixing device for ammunition grain shaping. A chuck bearing seat is mounted on a working table, a main shaft is rotatably mounted insides, the main shaft is connected with the output end of a main shaft rotating driving mechanism, and the main shaft is provided with a clamping jaw assembly rotating along with the main shaft; one side of a fixed disc mechanism is mountedon the main shaft, the other side of the fixed disc mechanism is provided with a guide body, a push plate mechanism is contained inside the fixed disc mechanism, a push plate is connected with the output end of a clamping jaw drive mechanism mounted on the chuck bearing seat and is driven by the clamping jaw drive mechanism to do reciprocating motion in the axial direction of the main shaft, and awedge-mounted push block is mounted on the push plate; and one end of a sliding block is located in the guide body in a relatively movable manner, the other end of the sliding block is a clamping jaw, the clamping jaw is provided with a spring for resetting the sliding block, and the two ends of the spring abut against the clamping jaw and the guide body. By means of the fixing device, quick andautonomous clamping and releasing are achieved in the ammunition grain shaping process, additional disturbance power cannot be generated to equipment in the forming process, and original postures cannot be changed.

The invention discloses a cabin section rapid posture adjustment and tensioning device based on a six-axis platform, which belongs to the field of missile cabin section docking. In order to solve the problems of coaxiality adjustment and tensioning force application of the docking cabin section, the device includes a slewing card The ring module, the tensioning module, and the rotating snap ring module are used to fix the docking section and adjust the posture; the tensioning module applies the tensioning force evenly in the circumferential direction of the cabin to complete the precise and efficient docking of the cabin. Suitable for fast and safe docking between socket-connected missile compartments.

The invention provides a lifting mechanism combined body fixing tool which comprises a bottom plate, a left short shaft, a right short shaft and a pin shaft. The base is used for replacing an outer frame barrel section of a lifting mechanism combined body and is installed on the combined body. The left short shaft is used for replacing a left short shaft and a bearing of the lifting mechanism combined body and is in rigid connection with the lifting mechanism combined body. The right short shaft is used for replacing a right short shaft and a bearing of the lifting mechanism combined body andis in rigid connection with the lifting mechanism combined body. The pin shaft is used for replacing a left pin shaft and a right pin shaft of the lifting mechanism combined body. By means of the lifting mechanism combined body fixing tool and a precision guarantee method of the lifting mechanism combined body fixing tool, a special auxiliary tool is adopted for improving product rigidity in the mounting and debugging process, benchmark control is taken into consideration, it is ensured that the benchmark can be reasonably converted, accumulative errors are reduced, and the precision guaranteerequirement is indirectly met in a machining allowance eliminating manner. Compared with a gasket measuring and debugging method, in the lifting mechanism combined body fixing tool and the precisionguarantee method of the lifting mechanism combined body fixing tool, the coaxial error is smaller than 0.1 mm, the upper surface and lower surface parallelism is smaller than 0.05 mm, taper pin matching is achieved by 70% or higher, and the problem about guarantee of the assembly precision of the lifting mechanism combined body is effectively solved.

The invention discloses a production technology of a permanent-magnet stepper motor. The method comprises the steps of (a) preparing a rotor and a stator; (b) carrying out laminated positioning on the axial outer end surfaces of an upper middle pole plate and a lower middle pole plate in cooperation with a laminated positioning structure through the laminated positioning structure; (c) assembling corresponding coil assemblies on middle pole plate pole claw groups of the corresponding middle pole plates and connecting outlet boxes and the coil assemblies; (d) assembling an upper case on the upper middle pole plate, ensuring that the upper middle pole plate is matched in a rabbet part of the upper case and a protruding part of the upper middle pole plate is clamped in a gap of the upper case; (e) making a short-axis extension end part of the rotor pass through an upper pole claw support part, supporting the short-axis extension end part on the upper case and then assembling a lower case; and (f) welding a contact part between the axial outer end surface of an open end of the lower case and the axial outer end surface of the open end of the upper case. By the production technology, the assembly accuracy can be improved; the performance of the motor is improved; the production efficiency can be improved; and massive production is facilitated.

The invention discloses a sewing machine and a driving device thereof. The driving device comprises a casing, a driving motor and a controller. The driving motor is provided with a motor rotor and a motor stator. The motor stator is provided with a first through hole. The motor rotor is provided with a second through-hole. A main shaft of the sewing machine serves as a motor shaft, is fixedly arranged in the second through hole to be circumferentially and fixedly connected with the motor rotor, and passes through the second through hole to be connected with an encoder. Compared with the priorart, the sewing machine and the driving device thereof have the advantages that existing technical prejudices are overcome, coaxiality errors are minimized to ensure smooth power transmission of the driving motor, the operating accuracy and output conversion rate are increased, abrasion of the machine during operation is reduced, and the service life of the machine is prolonged.

The present invention provides a calibration tool for installation on a thimble of a motor stator press-fitting machine. The calibration tool includes a main body and a calibration part. The main body is a round rod and is arranged coaxially with the thimble; The correction part includes a plurality of correction plates arranged on the outer peripheral surface of the main body part, the plate surfaces of each correction plate are parallel to the axial direction of the main body part, and the circumscribed circles of the correction plates The center of the circle is located on the axis of the main body, and the circumscribed circle matches the shape of the bearing hole on the end cover of the stator so that a plurality of the correction plates can fit into the bearing hole driven by the thimble . The calibration tooling of the present invention can calibrate the stator conveniently, quickly and accurately.

The invention discloses a bidirectional stamping tube expander. The bidirectional stamping tube expander comprises a machine frame body, an upper sliding rail and lower sliding rails, wherein horizontal supporting frames used for fixing a tube expanding tool are arranged on the left side and right side of the machine frame body respectively, traveling mechanisms are arranged at the left end and right end of the upper sliding rail respectively, the horizontal supporting frame on the left side of the machine frame body is movably connected with the lower end of the traveling mechanism at the left end of the upper sliding rail, and the horizontal supporting frame on the right side of the machine frame body is movably connected with the lower end of the traveling mechanism at the right end of the upper sliding rail; two working tables used for fixing a tube are arranged at the lower ends of the traveling mechanisms at the left end and right end of the upper sliding rail respectively, and each lower sliding rail is connected to the lower side of the corresponding working table. In this way, tube stamping and expanding can be achieved quickly, working efficiency is improved, and machining precision is guaranteed.

The invention relates to hydraulic gear pumps, in particular to a power transmission device of a gear pump for ferry glass reinforced plastic boats. The power transmission device is simple in structure, convenient for connection and long in service life, and is characterized in that a power output gear is arranged at the end of a power output shaft of a speed reducer, a power input internal gear ring is arranged at the end of a power input shaft of the hydraulic gear pump, the power output gear is meshed with the power input internal gear ring, and a protecting cover is arranged outside the power output gear and the power input internal gear ring and used for preventing entering of dust or danger caused by accidental touch during operation. The power transmission device has the advantages that since the power output shaft of the speed reducer is in direct meshed connection with the power input shaft of the hydraulic gear pump via the gear and the internal gear ring, the power output shaft of the speed reducer and the power input shaft of the hydraulic gear pump are small in coaxiality error, and the power transmission device is high in integral performance, long in service life, simple in structure and low in cost.