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 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 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 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 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 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.