41results about How to "Improve one-time assembly pass rate" patented technology

A method for calculating the eccentricity of the rotor assembly axis based on radial runout measurement, including the matrix representation of each point data and the calculation of the relative runout value, the establishment of the spring equivalent model and the calculation of the contact force of each point under the ideal state, the direction and size of the eccentricity; The calculation of the relative runout value of each point, and the process of calculating the assembly interference of each point according to the radial runout data of the two seam mating surfaces; the establishment of the spring equivalent model is based on the assumption of elastic deformation, and analyzes the force and contact at each stage during the contact process. Displacement relationship, the non-uniform contact force of each point is obtained by the non-uniform interference; the determination of the eccentricity is based on the spring equivalent model, and the final determination of the eccentricity is calculated according to the equilibrium state equation. This method is based on the measured radial runout data in actual production, realizes the prediction of the axis eccentricity before assembly, improves the rotor coaxiality after assembly, and predicts the axis, adjusts and optimizes the assembly phase during the assembly process of the aeroengine rotor parts It has important practical guiding significance.

The invention relates to a radiation unit matching block assembly device and method. The assembly device includes a matching block clamp and a radiation unit clamp. An elastic pin is arranged in the radiation unit clamp, and a matching block limiter is provided on one side of the matching block clamp close to the end. slot, one end of the matching block fixture is provided with a limit opening connected with the limit groove of the matching block; wherein, when the matching block fixture drives the matching block to extend into the radiation unit, the elastic pin in the radiation unit fixture extends from the limit opening Matching block stop slot and abut one end of mating block. The invention sends the matching block into the radiation unit fixture through the matching block fixture, and uses the elastic pin to limit the matching block in the matching block limit groove, so that the fast installation of the matching block in the narrow space of the speaker cavity can be realized, and the traditional The problem of precise installation and positioning of the matching block improves the stability and consistency of assembly accuracy, ensures the distance dimension accuracy between the matching block inside the cavity of the antenna radiation unit and the positioning reference plane of the flange, and improves the first-time assembly qualification rate.

The invention provides a low-noise high-pressure-difference adjusting valve which comprises a valve body, a valve cover, a sleeve, a valve element and a valve rod. The valve cover is connected to the top of the valve body through bolts, the sleeve is clamped between the valve cover and the valve body, a plurality of first-kind adjusting holes are formed in the upper portion of the side wall of the sleeve, a plurality of second-kind adjusting holes are formed in the lower portion of the side wall of the sleeve and the bottom face of the sleeve, the valve element is arranged in an inner cavity of the sleeve and can vertically move in the inner cavity of the sleeve, so that the low-noise high-pressure-difference adjusting valve is closed or opened, a plurality of pressure balance holes are formed in the valve element in the axial direction of the valve element, and the valve rod penetrates through a center through hole in the valve cover and is connected with the valve element. The low-noise high-pressure-difference adjusting valve is simple, compact and reasonable in structure, small in size and light, and has the advantage of being capable of bearing a high pressure difference and a high leakage level under the condition of the same drive source.

The invention provides a pressure reduction type backflow preventing device. According to an existing backflow preventing device, a pressure reduction portion adopts a membrane for transferring pressure and is sealed, however, due to the fact that a processing technique of the membrane is complex, the product quality is unstable, and the service life is influenced. The pressure reduction type backflow preventing device is composed of two check valves which work independently. A differential pressure relief valve is externally connected between the two check valves. The two ends of each check valve are further directly connected with two ball valves used for maintenance and four elastic sealed test ball valves, and therefore the complete pressure reduction type backflow preventing device is formed. Under the water supply condition, water in a main water delivery pipeline passes through a pressure reduction area from the check valve in the inlet position, reaches the outlet of the check valve in the outlet position, and is supplied to users. High-pressure water at the inlet of the check valve in the inlet position is directly led into an upper membrane cavity of a pressure reduction valve, and a lower membrane cavity communicates with the inlet of the check valve in the outlet position. Due to the fact that a certain pressure difference exists, a membrane is pushed to move rightwards, the pressure reduction valve is closed, and water supply is normal.

The invention discloses a coaxiality regulating and locating device. The coaxiality regulating and locating device comprises a bottom plate and a bearing seat, wherein the bearing seat is clamped in a through hole of the bottom plate through an upper flange, and the base is fixedly connected with the bearing seat through a screw; an air cylinder is fixedly connected with the base through a stud; an ejecting block in which an I-shaped hole is formed in the middle part is in clearance fit with a differential diameter hole, a piston rod of the air cylinder stretches into the I-shaped hole and is fixed with the I-shaped hole through a nut, a locating seat is arranged in a stepped hole of the bearing seat, and two bearings are arranged in a left gap and a right gap between the locating seat and the bearing seat. According to the coaxiality regulating and locating device disclosed by the invention, a workpiece and a locating tool can be rotated together by rotating the bearings, no relative motion is generated between the workpiece and the locating tool, friction is avoided, and thus the abrasion of a locating clamp is avoided; gaps between the locating tool and the workpiece are reduced, the regulating accuracy is increased, and the one-step assembling qualified rate is improved; a pneumatic lifting device is adopted, the problem that the workpiece is clamped in the locating tool due to high accuracy of the locating tool and small matching gaps between the locating tool and the workpiece is solved, and the workpiece can be conveniently lifted.

The invention discloses a tolerance adjustment device and an installation structure for concealing a door handle. The tolerance adjustment device comprises a stud, a fixing bracket and a locking assembly; the outer wall of the stud is provided with a first thread and a flange surface; The flange surface is an annular structure surrounding the stud, and there is a preset distance between the flange surface and the end surface of the stud, and the flange surface is used to abut the stud for positioning The fixing bracket is provided with a first through hole, and the inner wall of the first through hole is provided with a second thread; the stud and the fixing bracket pass through the first thread and the second thread. Two threaded connections; the locking assembly is used for fixing the stud and the fixing bracket to the mounting surface. The tolerance adjustment device and the installation structure of the hidden door handle of the present invention can effectively solve the problem of preventing the tolerance adjuster from rotating in the prior art, improve the positioning accuracy, and effectively improve the qualified rate of one-time assembly of the hidden door handle.

The invention discloses an oil damper. The oil damper comprises an oil storage cylinder, a piston assembly, a work oil cylinder, a bottom valve assembly, a guide assembly and a gland. The oil storage cylinder comprises an outer cylinder body barrel and a base. An oil storage cavity is formed between the work oil cylinder and the outer cylinder body barrel. The guide assembly is arranged at the rear end of the work oil cylinder. The end, away from a piston, of a piston rod of the piston assembly penetrates out of the guide assembly and the gland outwards, and the piston divides the work oil cylinder into a first cavity and a second cavity. The base is provided with a compressing damping regulation valve, the inlet of the compressing damping regulation valve is communicated with the first cavity, and the outlet of the compressing damping regulation valve is communicated with the oil storage cavity. The guide assembly is provided with a stretching check valve and a stretching damping regulation valve, the inlet of the stretching check valve is communicated with the oil storage cavity, the outlet of the stretching check valve is communicated with the second cavity, the inlet of the stretching damping regulation valve is communicated with the second cavity, and the outlet of the stretching damping regulation valve is communicated with the oil storage cavity. The bottom valve assembly is provided with a one-way check valve. The oil damper has the advantages that the stretching and compressing damping force can be symmetric or asymmetric, can be independently adjusted and can be externally adjusted.

An elastic algorithm for calculating the rotor assembly pose based on end-jump measurement. By equating the rotor mating surface into a plurality of asperity contact pairs, the Hertzian contact law is used to calculate the contact elastic deformation, and the actual contact contact pairs are separated. , use the energy and moment balance equation to judge the final contact state, and finally solve the normal vector of the contact plane to represent the contact pose, which improves the accuracy of the rotor assembly pose prediction, which can well reflect the assembly coaxiality, and better Realize the prediction and optimization of rotor assembly phase. This method is based on the measured end-jump data in actual production, and considers the elastic deformation generated during the assembly process, which makes up for the deficiency of the rigidity prediction algorithm, realizes the accurate prediction of the assembly pose before assembly, and improves the rotor synchronization after assembly. At the same time, the first-time assembly qualification rate is greatly improved, which has important practical guiding significance for axis prediction, assembly phase adjustment and optimization in the assembly process of aero-engine rotor parts.

The invention relates to a radiating unit matching block positioning mechanism, an assembling device and a method. The positioning mechanism comprises a tooling frame, a first clamping cylinder and a first pneumatic clamping jaw, wherein the first clamping cylinder is installed on the tooling frame and Its driving end is connected to and drives the opening and closing of two first pneumatic clamping jaws. The first pneumatic clamping jaws are located above the tooling frame and are spaced apart from the tooling frame. After the two first pneumatic clamping jaws are closed, a Matching block holding hole for holding matching block. The invention adopts the first clamping cylinder to drive the first pneumatic clamping claw to clamp the matching block, and when the matching block clamp extends into the interval between the upper part of the tooling frame and the first pneumatic clamping claw, the first clamping cylinder drives the first pneumatic clamping claw. A pneumatic gripper releases the matching block so that the matching block falls into the matching block limiting groove of the matching block fixture.

The invention provides a solenoid valve and a mass flow controller. The solenoid valve includes a solenoid, a valve body assembly, a valve core assembly, a plug assembly, and a valve port component, wherein the valve core assembly, the plug assembly, and the valve port component are stacked in sequence. Placed in the accommodation chamber of the valve body assembly, the valve core assembly is movably arranged in the accommodation chamber, the plug assembly includes a magnetic seat and a plug, the magnetic seat is fixedly arranged in the accommodation chamber, and the plug is movably arranged In the mounting hole of the magnetic seat, the valve core assembly is in point contact with the plug, and the end face of the valve port part facing the plug assembly is provided with a valve port, and the plug is set opposite to the valve port; the electromagnetic part is used to magnetize the valve core assembly and the magnet. seat, so that the magnetic seat attracts the valve core assembly to move, and then drives the plug to move, and adjusts the distance between the plug and the valve port. The electromagnetic valve and the mass flow controller provided by the present invention can improve the working reliability and reduce the difficulty of assembly, so as to improve the first-time assembly pass rate, reduce the processing difficulty of parts and components, reduce the processing cost, and reduce their own volume.