94results about How to "Reduce concentricity" patented technology

The invention discloses a precision metering ceramic plunger liquid charge pump which structurally comprises a pump head, two single-direction valves, a pump body, a driving mechanism and a control driving unit. The singe-direction valves are connected into thread holes in the pump head through threads on upper valve bases and lower valve covers. The pump head penetrates through four through holes through inner hexagonal bolts, and the pump head and a pump body outer shell are fastened on a driving outer shell. A motor base is fastened on the driving outer shell by the fact that inner hexagonal bolts penetrate through four through holes. A driving motor is fastened on the motor base by the fact that inner hexagonal bolts penetrate through four through holes. One end of a plunger core in the pump body is connected with inner threads of a floating connector in the driving mechanism through outer threads. The driving mechanism is connected with the control driving unit. The liquid charge pump has corrosion resistance and abrasion resistance, impurities are not mixed into ceramic, so that the fact that medicine liquid is not contaminated during a liquid-charge process is guaranteed, the roughness of the surface of the ceramic is low, on-line washing is easy, and accuracy and speed are improved.

The invention relates to a turning positioning fixture for thin-wall rotational parts and a clamping method. The fixture comprises a cylindrical positioning body and threaded rings, wherein an external thread is lathed on the external surface of the positioning end; the threaded rings are circular rings with internal diameter the same as the external diameter of the positioning body; the internal surfaces of the threaded rings are provided with internal threads matched with the external thread on the positioning body; and during positioning, one end of the positioning body is clamped on a machine tool and the positioning end is closely contacted with the part, and the positioning body is closely matched with the part through the external thread on the external surface and the internal threads on the threaded rings. In the embodiment, the clamp force on the part is mainly axial force, thus overcoming the negative effect that radial force leads to workpiece deformation during traditional machining; and the positioning body is clamped and lathed at the site, and during positioning and clamping, firstly the positioning body is ensured to be fit with the end face of the part and the end face runout of the part is ensured to be identical with that of the spindle of the machine tool, thus ensuring the flatness and the parallelism of the part. The fixture can carry out automatic alignment and positioning while screwing the threaded rings, is convenient to operate and reduces artificial operation errors.

A balance valve comprises a valve body, an end cover, a plug, a valve core, a valve seat and a piston, wherein the end cover and the plug are respectively connected with the two ends of the valve body in a sealing mode. A third oil port is formed in the rear end of the plug, a filter screen and a damper are arranged at the third oil port, and the valve seat is arranged in a first cavity of the valve body and located between a first oil port and a second port. The front section of the valve core is matched in the end cover in a sliding mode, the rear section of the valve core is matched in a through-hole of the valve seat, an inner cavity which is axially penetrating is formed in the valve core, a steel ball which is matched with the inner cavity of the valve core is arranged in the valve core, a boss for axially limiting the steel ball is arranged in the inner cavity of the valve core, a first spring which is abutted against the steel ball is arranged in the inner cavity of the valve core, and the other end of the first spring is abutted in the end cover. The piston is matched in a second cavity in a sliding mode, the ladder end of the piston penetrates a cavity wall between the first cavity and the second cavity and is matched in the inner cavity of the valve core in a sliding mode, and a one-way throttling device is arranged at the rear end of the piston. The balance valve is simple in structure, compact in size and stable in working.

A core mold for manufacturing an intermediate tubular shaft of a coupler comprises a static mold and a movable mold. The static mold and the movable mold are detachably assembled. The static mold comprises a static mold cylinder, a static mold seal head and a static mold shaft fixedly installed in the middle of the static mold seal head. A first cutting seam is formed in the joint of the static mold cylinder and the static mold seal head. The movable mold comprises a movable mold cylinder and a movable mold seal head. A second cutting seam is formed in the joint of the movable mold cylinder and the movable mold seal head. The static mold and the movable mold are assembled together, the static mold shaft penetrates through the static mold and the movable mold, and the static mold cylinder and the movable mold cylinder are assembled to form an intermediate cylinder; the inner surface of the intermediate cylinder is a cylindrical surface, the two ends of the outer surface of the intermediate cylinder are conical surfaces, and the middle portion of the outer surface of the intermediate cylinder is a cylindrical surface. The core mold does not deform in the wind-forming process of the intermediate tubular shaft, the internal conical surface is formed while the intermediate tubular shaft is formed through winding, and the procedure of conical surface machining is omitted, so that the production cost is reduced, the production efficiency is improved, and the coaxiality of the intermediate tubular shaft is guaranteed. The invention further provides a manufacturing method of the intermediate tubular shaft of the coupler.

The invention belongs to the technical field of wind power blades, and particularly discloses a preparation method of a wind power blade. The preparation method comprises the following steps that at S1, an SS embedded part and a PS embedded part are manufactured, specifically, the SS embedded part and the PS embedded part each comprise a connecting flange, a plurality of sets of thread inserts, a UD block, a wedge-shaped block and a sealing ring; at S2, an SS embedded blade root and a PS embedded blade root are manufactured; at S3, an SS half shell and a PS half shell are poured; and at S4, the SS half shell and the PS half shell are subjected to mold closing, specifically, the position of an embedded blade root flange is adjusted on a blade mold, and then the SS half shell and the PS half shell are bonded, and after bonding and curing, the embedded blade root flange is removed, demolding is performed, and finally the blade is manufactured. A positioning tool is arranged on the blade mold, and the positioning tool can position and adjust the position of the embedded blade root flange. According to the method, the problems that the deformation amount is large, and installation interference is caused by dislocation of thread insert holes and a connecting hole of a main engine bearing due to the adoption of an existing blade root embedding technology can be solved.

Provided is an electric pump comprising a pump unit that has a pump housing and a gear pump accommodated in the pump housing and that suctions in and discharges a working fluid due to rotation of thegear pump. The electric pump is also provided with a motor unit that has a rotor which is arranged adjacent to the pump unit in a direction along the axis of the pump unit and which rotates coaxiallywith the axis and synchronously with the gear pump, and a stator which is disposed coaxially with the axis on the outer periphery of the rotor and which imparts rotational driving force to the rotor.The electric pump is further provided with a resin part integrally covering at least the outer periphery of the pump housing and the outer periphery of the stator.

The invention discloses a plug-in type balance valve. The plug-in type balance valve comprises a valve body, a main valve element, a first valve seat, a second valve seat, a valve pocket, a first elastic part and a second elastic part. The first valve seat is fixedly arranged in the valve body, and the main valve element is in sliding fit with the first valve seat and the valve pocket. Oil pushes open the second valve seat when the oil flows into a V oil port, and the oil flows to a C oil port through a first through hole. The first elastic part is installed in the valve body, the valve body and the valve pocket are fixedly connected, and multiple arc-shaped grooves are formed in the circumferential face of the valve element in the axial direction. When the oil flowing into an X oil port pushes the main valve element to move in the direction of compressing the first elastic part, the open area of the oil, flowing to the V oil port through the arc-shaped grooves, at the C oil port is gradually increased. The plug-in type balance valve is simple in structure and low in manufacturing cost, and the load descending speed can be precisely controlled without affecting the ascending speed.

In a device on a draw frame having a drafting system for textile fibre slivers with weighting of the upper rolls of the drafting system which comprises roll pairs arranged one behind the other, the pairs having lower and upper rolls, the rotating journals at the ends of the upper roll are mounted by means of bearing elements and the bearing elements each have at least one deep-groove ball bearing having an immovable outer housing (outer ring) and an internal rotational body (inner ring). In order to provide a structurally simple way in which the bearing housings can be mounted on or removed from the presser roll in a simple, quick and reliable manner, the bearing elements are in the form of deep-groove ball bearings and there is a coupling between the journal and the rotational body.

The invention provides a hydraulic drive type podded propulsor for testing. The hydraulic drive type podded propulsor for testing comprises a podded propulsor unit and further comprises a hydraulic control system; a propeller drive of the podded propulsor unit is a hydraulic motor; L-shaped rigid oil pipes are mounted on an oil inlet and an oil outlet of the hydraulic motor; the L-shaped rigid oilpipes are connected with a rigid oil pipe disposed along a pod supporting rod through a rigid oil pipe joint; the rigid oil pipe passes through a flange plate of the pod supporting rod; the rigid oilpipe on an upper end of the flange plate of the pod supporting rod is connected with a universal rotating joint; the universal rotating joint is then connected to one section of the rigid oil pipe; the hydraulic control system comprises a hydraulic pump station and a hydraulic motor controller; an oil outlet and an oil return port of the hydraulic pump station are connected with the last sectionof the rigid oil pipe through a flexible oil pipe. The hydraulic drive type podded propulsor for testing is suitable for development and research of the podded propulsor and has the advantages of small size, good stability, light weight and convenient assembly and disassembly.

The invention discloses a vacuum brazing method of a high-temperature alloy and cobalt-based powder metallurgy material, which includes confirmation of a brazing gap; combined layout method of a gold-based brazing filler and a brazing technique. The invention realizes the preparation of a cobalt-based powder metallurgy wear-resisting material layer with excellent friction performance at the surface of a precise spare part. According to the precise spare part processed by the brazing technique, the brazing filler fills the weld joint completely, and the weld joint is good in uniformity; the coaxial dimension precision of the welding spare part is guaranteed, and the shear intensity of the weld joint is over 280 MPa.

The invention discloses a processing technology of rigid flexible wheels of a robot speed reducer. The processing technology includes the steps of manufacturing blanks of the rigid flexible wheels byprecise casting or forging casting, subjecting the blanks of the rigid flexible wheels to rough processing, subjecting the rough-processed blanks of the rigid flexible wheels to heat treatment, subjecting external gears and internal races of the rigid flexible wheels to super-finishing, and detecting various index of the super-finished rigid flexible wheels until reaching requirements of finishedproducts.

The invention discloses a radial magnetic bearing and sensor bracket split structure. The radial magnetic bearing and sensor bracket split structure comprises a radial magnetic bearing, a displacement sensor, a magnetic bearing bracket and a sensor bracket, wherein both the magnetic bearing bracket and the sensor bracket are of circular structures, the sensor bracket is coaxially arranged in the magnetic bearing bracket, magnetic poles of the radial magnetic bearing are fixed to the interior of the magnetic bearing bracket, and the displacement sensor is installed on the inner circular surface of the sensor bracket. The displacement sensor and the magnetic poles of the radial magnetic bearing are installed in the same component and can be integrally assembled and disassembled, therefore, the concentricity of the displacement sensor and the radial magnetic bearing cannot be changed by repeated disassembly and assembly of the radial magnetic bearing, and the control program of the magnetic bearing can be simplified. Additionally, the sensor and the sensor bracket can be separately removed from the assembly and can be replaced together, so that the production efficiency is improved, and the maintenance time and maintenance cost are reduced.

A needle roller for carding machine belongs to a piece of equipment for carding machine in the cotton textile industry. The needle roller includes an aluminum pipe and a central axle; both ends of the aluminum pipe are sealed with flanges; the wall of the aluminum alloy pipe is opened with a aluminum hole; a steel needle is planted in the aluminum hole, which consists of a needle tip and a needle bar; the needle bar of the steel needle planted in the aluminum alloy pipe hole is adhered and integrated to the aluminum alloy pipe by super glue. The product quality is reliable; the needle roller and the needle tip have small coaxially and high co-straightness; the needle roller with the aluminum alloy as base structure is convenient in installation, has light weight, less energy consumption, high equipment manufacturing efficiency; in addition, the time for parking for maintenance is short, the carding quality is stable and unchanged, which is applicable to reconstruction of the current carding machines, and improves the performance and quality of the carding machines.

The invention relates to a moment rotary rigidity high-low temperature testing device, which comprises a foundation platform, a driving and testing integrated module, an overload protection module, anadjusting module and support modules. The overload protection module is a magnetic powder brake overload protection module; the overload protection module, the support modules, a high-low temperaturebox and the adjusting module are installed on the foundation platform, the high-low temperature box is located between the two support modules, the driving and testing integrated module is installedon the adjusting module, and a transmission shaft between a torsion driving module and the support module is provided with a dynamic torque sensor and an angle encoder. Box penetrating shafts connected with the output end of the torsion driving module and the output end of the overload protection module are supported by the support modules to rotate, the side walls of the high-low temperature boxare each provided with an annular elastic sealing gasket, and the annular elastic sealing gaskets are located in grooves of air sealing rings arranged on the box penetrating shafts in a sleeving modeand make friction contact with the bottom faces of the grooves. The air seal rings are circular rings formed by connecting two metal semi-rings in a butt joint mode. The device adapts to high and lowtemperature tests, and the test is flexible and convenient.

In a device on a drafting system for textile fibre slivers with weighting of the upper rolls of the drafting system which comprises roll pairs arranged one behind the other, the pairs having lower and upper rolls, the rotating journals at the ends of the upper roll are mounted by means of bearing elements and the bearing elements each have at least one rolling-element bearing having an immovable outer housing (outer ring) and an internal rotational body (inner ring). In order to provide a structurally simple way in which the bearing housings can be mounted on or removed from the presser roll in a simple, quick and reliable manner, the bearing elements are in the form of rolling-element bearings and there is a coupling between the journal and the rotational body.

The invention discloses an electric main shaft with a mouse cage type motor stator cooling structure, comprising a main shaft assembly, a motor stator, a motor rotor, a box body, a front bearing assembly and a rear bearing assembly, wherein the motor stator is sleeved in the box body; the motor rotor is sleeved on the main shaft assembly; the main shaft assembly is arranged in the motor stator and supported on the box body through the front bearing assembly and the rear bearing assembly; the box body is provided with a mouse cage type cooling passage used for cooling the motor stator; the front end of the box body is provided with a front bearing seat used for installing the front bearing assembly; the front bearing seat and the box body are cast into an integer; one end of the motor stator, which is close to the front bearing seat, is sleeved with a stator side ring, and the motor stator can act on the stator side ring from an inner hole of the front bearing seat through a cylinder tooling and be pushed out of the rear end of the box body. The electric main shaft with the mouse cage type motor stator cooling structure has compact structure, convenient disassembly and assembly and good cooling effect.

The invention discloses a manufacturing tool for a [phi]25 mm tearing test piece; an inner mold is placed in a shell, and an inner cavity of the shell is divided into a plurality of forming cavities through the inner mold. A top cover is placed on the upper end face of the shell, and the two ends of a positioning rod on the lower surface of the top cover are attached to the inner surfaces of the two sides of the shell so that the top cover can be positioned. Forming holes in the inner mold and the guide holes in the top cover are in one-to-one correspondence and are concentric. A pressure applying rod is arranged in each guide hole in the top cover. A vacuum bag sleeves the outer surface of the manufacturing tool. The method solves the problems of local dislocation and uncontrollable pressing pressure intensity of a test piece, is simple to operate, low in coaxiality of the tearing test piece and controllable in pressing pressure, improves the manufacturing quality of the tearing testpiece, has the bonding strength of 5.88 MPa and the ratio of the maximum and minimum difference values to the mean value of 0.08, and is stable in quality of the test piece; and the bonding performance of a shell and a heat insulation layer of a solid rocket engine can be expressed more accurately.

The invention discloses a rotor structure and an engine, and belongs to the technical field of aero-engine equipment. The rotor structure comprises an air compressor, a turbine, a transmission torsionshaft sleeve and a locking pull rod. One end of the transmission torsion shaft sleeve is in transmission connection with the air compressor through a first transmission connection part, and the otherend of the transmission torsion shaft sleeve is in transmission connection with the turbine through a second transmission connection part. The locking pull rod penetrates through the transmission torsion shaft sleeve. The two ends of the locking pull rod are connected with the air compressor and the turbine separately. The first transmission connection part and/or the second transmission connection part are flexible transmission connection parts. According to the rod structure and the engine, under the combined effect of the transmission torsion shaft sleeve, the locking pull rod and the flexible transmission connection parts, flexible connection and transmission of the turbine and the air compressor are achieved; and automatic adjustment can be achieved to a certain extent in the high-speed rotating process of the engine so that the transmission torsion shaft sleeve, the locking pull rod and the flexible transmission connection parts can rotate separately around self axes, and accordingly, the requirements for the coaxiality, assembly precision and machining of all components of a rotor are lowered.

The invention relates to a die for casting a dry type transformer coil. The die consists of a left semi-shell and a right semi-shell which are connected into a whole through bolts, wherein sealing grooves are formed on contact surfaces of the left semi-shell and the right semi-shell; and a high-temperature-resistant silicon rubber strip is placed in each sealing groove for sealing. The invention is characterized in that: the die is equally divided into an upper part and a lower part which are connected into a whole through the bolts; corresponding sealing grooves are formed on the contact surfaces of the upper part and the lower part; the high-temperature-resistant silicon rubber strip is placed in each sealing groove for sealing; and a positioning connecting part is arranged on the outer side of each sealing groove. The circular degree, coaxiality and smoothness of the die can be guaranteed so that the range of equipment for processing the die is expanded, processing difficulty is reduced, processing period is shortened, processing cost is reduced and quality of the cast coil is guaranteed.