49results about How to "Improve dynamic balance accuracy" patented technology

The invention discloses a method for adjusting dynamic balance of a rotor of a magnetic suspension vacuum molecular pump, which particularly comprises fist, detecting an actual vibrating signal of a rotor which is obtained by a sensor directly from a rotor of a magnetic bearing, second, collecting rotor speed and phase signal, third, doing an isolating process of direct current composition to the vibrating signal of the rotor which is obtained, fourth, doing a real-time filtering process to the vibrating signal according to the rotor speed, obtaining vibrating signals with the same frequency of the rotor, fifth, finishing corresponding dynamic balance algorism in post period by utilizing a dynamic balancing device or an observation system which is operated in a magnetic suspension vacuum molecular pump, and doing a dynamic balance to the rotor according to the result of the dynamic balance algorism, sixth, repeating the steps untill the rotor achieves a needed dynamic balancing accuracy. The method of the invention has the advantages of high accuracy of a vibrating value which is collected, high dynamic balance accuracy, and balancing behavior of the rotor is completely consistent with the final actual operating behavior, which is beneficial for simplifying dynamic balancing equipment.

The present invention discloses a rotary machinery dynamic balance quick weight-countering adjustment device. The device comprises a balance disc and at least one pair of weight-countering adjusting components mounted on the balance disc, wherein the weight-countering adjusting components are distributed at equal intervals along the radial direction of the disc surface of the balance disc. According to the rotary machinery dynamic balance quick weight-countering adjustment device of the invention, after weight-countering mass, a weight-countering position and a weight-countering angle are obtained through a traditional dynamic balance algorithm, counterweights are not needed to be temporarily processed on a site, operation such as welding the counterweights is not required, and therefore, field dynamic balance time can be greatly decreased; as for field dynamic balance according to which a weight-countering position is provided with a cylinder or a shaft sleeve, it only needs to reserve adjustment holes, and a special wrench can be adopted to conveniently and fast adjust the weight-countering adjustment device of the invention through the adjustment holes, and therefore, field workload can be greatly decreased; and since the adjustment of the positions of the counterweights can be carried out through screw rods, and the positions of the counterweights can be adjusted very precisely, and the precision of dynamic balance is improved. The weight-countering adjustment algorithm of the invention is easy to understand and can facilitate field personnel to carry out adjustment and calculation.

The invention belongs to the technical field of rotating equipment fault diagnosis and control, and particularly relates to a dynamic balancing method for high-speed rotors. According to the method, on the basis of acquiring vibration information of a rotor, vibration data at high speed and vibration data at low speed are cut down at the same scale through post processing, the interference of rotor measurement section profile error, phase discrimination mark, electromagnetic interference, bending and other non-imbalance factors is eliminated, and purification of unbalanced vibration is realized. Compared with a traditional dynamic balancing method, the method ensures precise acquisition of unbalanced vibration data and obviously improves the precision of dynamic balancing, and the method needs no phase discrimination sensors, reduces the dependence of a system to the installation space and reduces the complexity and the development cost of the system. Besides, the method has a wide range of applications, has a simple process, is conductive to the realization of computerized control, and has good practical application values.

The invention provides a signal conditioning device used for an inductively coupled plasma (ICP) acceleration sensor. The signal conditioning device used for the ICP acceleration sensor comprises a first power supply module, a second power supply module, a constant flow source module, a sensor interface module, an alternating current coupling module, a filtering and amplifying module, a signal output module and an integrated operational amplifier power supply module, wherein the first power supply module and the second power supply module are respectively connected with a change-over switch, the constant flow source module is connected with the change-over switch and connected with the first power supply module and the second power supply module under the control of the change-over switch, the sensor interface module is connected with the ICP acceleration sensor, the ICP acceleration sensor outputs a detecting signal according to constant current when works, the alternating current coupling module is connected with the sensor interface module, the filtering and amplifying module is connected with the alternating current coupling module, the signal output module is connected with the filtering and amplifying module, and the integrated operational amplifier power supply module is connected with the filtering and amplifying module. According to the signal conditioning device used for the ICP acceleration sensor, phase changes of signals in a certain range can be little after the signals through filtering, accordingly balance errors caused by phase shift in rotor dynamic balancing are reduced, and dynamic balance quality is improved.

The invention discloses a crisscross package assembly of a universal coupler, which comprises a crisscross shaft; four shaft heads are arranged on the crisscross shaft; an oil storage hole is arranged in each shaft head, and a bearing outer ring is sleeved on each shaft head; the diameter of the inner hole of the outer end surface of the bearing outer ring is more than that of the oil storage hole; an adjusting nut is connected onto the inner hole of the outer end surface of the bearing outer ring through a thread; the outer end surface of the bearing outer ring is connected with an end cover which limits the adjusting nut; and when the crisscross package assembly is applied to the coupler, the concentricity of a middle shaft on the coupler and fork heads on both ends is adjusted through the adjusting nut. According to the crisscross package assembly of the universal coupler, the processing, assembly and other errors of the coupler can be effectively, precisely and reliably adjusted, the concentricity of the middle shaft on the coupler and the fork heads on both ends is improved, so that the dynamic balance precision of the coupler in use is improved; and meanwhile, great convenience is provided for the replacement and the maintenance of the parts of the crisscross package assembly.

The invention provides a rolling forming method of wheel disc, which comprises the following steps: (1) Baiting a circular blank; (2) placing the circular blank in a cavity of a rolling explorator and adopting at least two rolling wheels symmetrically arranged along the circumferential direction of the rolling explorator to perform planar synchronous staggered rolling on the circular blank in the cavity of the rolling explorator; (3) performing trimming and sizing; and (4) stretch forming. The rolling forming method of wheel disc of this invention can precisely form various geometric sections with gradual deformation. The formed product has a uniform mass in the axial direction and the circumferential direction, and has a high dynamic balance precision. The invention can make the blank deform precisely, enhance the production efficiency, and reduce the cost, therefore the invention has good application and popularization prospect.

The invention relates to an electric spindle design adopting an electromagnetic anti-thrust and a radial bearing support. According to the outline dimension limit and the stiffness requirement of the electric spindle, the two ends inside a shell (5) of the electric spindle is provided with an electromagnetic anti-thrust bearing (1), which eliminates the electromagnetic interference between the two ends, is beneficial for the design and concentration of the power supply line of the electromagnetic anti-thrust bearing and ensures the radial stiffness of a rotor-rotating shaft integrated shaft system (3). The two sides inside the shell of the electric spindle are symmetrically provided with aerostatic pressure radial bearings (2) so as to support the shaft system (3). The symmetric aerostatic pressure radial bearings can reduce the vibration of the shaft system when the electric motor is in the state of operation with super high speed and ensure the radial stiffness. The rotor-rotating shaft integrated shaft system makes the squirrel-cage bar of the rotor of the electric motor and the rotating shaft into an integrated structure and the corresponding position of a stator (4) arranged in the middle section and the shell of the electric spindle, that is the position of the squirrel-cage bar, adopts copper alloys directly welded in a groove to reduce the creep deformation of the rotor bar, reduce the vibration value of the shaft system and improve the power rate and the structural strength.

The invention relates to an electric spindle design adopting an aerostatic pressure anti-thrust and an aerostatic pressure radial bearing support. According to the outline dimension limit and the stiffness requirement of the electric spindle, the front end inside a shell (5) of the electric spindle is centrally provided with two aerostatic pressure anti-thrust bearings (1), thus leading the space utilization to be optimized and the structure to be compact, and at the same time the two aerostatic pressure anti-thrust bearings lead a supply air line convenient to centralize and install and provides the needed radial stiffness for a rotor-rotating shaft integrated shaft system (3). The two sides of a stator (4) are symmetrically provided with an aerostatic pressure radial bearing (2) so as to support the rotor-rotating shaft integrated shaft system, reduce the vibration of the shaft system (3) and ensure the radial stiffness. The rotor-rotating shaft integrated shaft system makes the squirrel-cage bar of the rotor of the electric motor and the rotating shaft into the integrated structure and the corresponding position of the stator arranged in the middle section and the shell of the electric spindle, that is the position of the squirrel-cage bar, adopts copper alloys directly welded in a groove of the integrated shaft system so as to reduce the creep deformation of the squirrel-cage bar, reduce the vibration value of the integrated shaft system and improve the power rate and the structural strength.

The invention relates to a diaphragm disc coupling for connecting a BPRT speed changing clutch, and relates to the technical field of mechanical transmission. The diaphragm disc coupling aims to solvethe problems that the axial size of an existing diaphragm disc coupling is large, the mass is large, consequently the unit dynamic balance precision is low, and the unit operation stability is affected. The diaphragm disc coupling comprises an input flange, an intermediate shaft, an output flange and two diaphragm discs, the shape of the intermediate shaft is a hollow shell with openings in the two ends, the two ends of the intermediate shaft are each provided with one diaphragm disc, the diaphragm discs and the intermediate shaft are positioned through a plurality of positioning pins, the middle portions of the outer side ends of the diaphragm discs are provided with positioning plates, the end surfaces of the outer sides of the positioning plates are uniformly provided with a pluralityof connecting bolts in the circumferential direction, the tail ends of the connecting bolts penetrate through the diaphragm discs, the connecting bolts rotate on the end face of the intermediate shaft, and flange plates of the input flange and the output flange are fixedly connected to the outer circumference of the outer side end of one diaphragm disc through the multiple connecting bolts. The diaphragm disc coupling is used for connecting the BPRT speed changing clutch.

The invention discloses a constrained high-speed dynamic balance mechanical calculation method, which comprises the following steps of: calculating an influence coefficient through driving, trial weight and measurement, and establishing an influence coefficient matrix; establishing a Lagrange function according to constraint conditions of a dynamic balance standard: solving a counterweight optimalvalue by utilizing a KKT condition; and adding and reducing weight, and driving to correct a dynamic balance result. By adding constraints to the intensity value at the key rotating speed, the intensity value of the key rotating speed is further reduced on the premise of ensuring overall vibration reduction, and stable operation of the rotor is ensured. The method provided by the invention is suitable for dynamic balance mechanical calculation of turbomachinery rotors which have high requirements on residual unbalance and of which the working rotating speed at least exceeds a first-order critical rotating speed. And low-cost operability of constrained high-speed dynamic balance calculation can be realized. Operators only need to input the magnitude of the constraint intensity value on a program panel, and the magnitude and phase of the balance weight and the estimated value of the residual unbalance amount can be obtained through full-automatic calculation and analysis of a program.

The invention relates to an electric spindle design adopting an aerostatic pressure anti-thrust and an electromagnetic radial bearing support. According to the outline dimension limit and the stiffness requirement of the electric spindle, the front end inside a shell (5) of the electric spindle is centrally provided with two aerostatic pressure anti-thrust bearings (1), so as to leads the space utilization to be optimized, and the structure to be compact and at the same time the two aerostatic pressure anti-thrust bearings lead a supply air line to be convenient to centralize and install and provides the needed radial stiffness for a rotor-rotating shaft integrated shaft system (3). The two sides of a stator (4) are symmetrically provided with an electromagnetic radial bearing (2) so as to support the rotor-rotating shaft integrated shaft system, reduce the vibration of the shaft system (3) and ensure the radial stiffness. The rotor-rotating shaft integrated shaft system makes a squirrel-cage bar of the rotor of the electric motor and the rotating shaft into the integrated structure and the corresponding position of the stator arranged in the middle section and the shell of the electric spindle, that is the position of the squirrel-cage bar, adopts copper alloys directly welded in a groove so as to reduce the creep deformation of the squirrel-cage bar, reduce the vibration and improve the power rate and the structural strength.

The invention aims at providing a marine steam turbine rotor field dynamic balance structure. The structure comprises a rotor, the rotor is a high-power marine steam turbine flexible rotor, and the rotor is provided with field dynamic balance structures at a first-stage wheel disc, a last-stage wheel disc, a thrust disc and a coupler side flange. According to the structure, multi-plane combined adjustment can be carried out on a plurality of positions of the outer sides of the first-stage wheel disc and the last-stage wheel disc of the rotor, the rotor thrust disc and the coupler output flange. The rotor dynamic balance precision can be improved by adjusting the quality of a dynamic balance block and a screw, and the operability is very high. The dynamic balance precision of the marine steam turbine rotor can be guaranteed for a long time, the safe and stable operation requirements are met, and high expenditure and long-period maintenance for opening a cylinder in a ship cabin and returning the cylinder to a factory for high-speed dynamic balance are saved.

The invention belongs to the technical field of vane pumps and particularly relates to a dynamic balance testing method for simulating the mass of media in a pump impeller runner. The dynamic balance testing method for simulating the mass of the media in the pump impeller runner comprises the first step of medium adhesion, the second step of cooling and solidification, the third step of taking out of excess materials, the fourth step of modification of unbalance and the fifth step of removal of the simulated media. By means of the dynamic balance testing method for simulating the mass of the media in the pump impeller runner, the technical problems that impeller mass unbalance can still be caused when an impeller subjected to dynamic balance testing in air and modification is in practical use, and pump vibration is aggravated are solved. As for the method, the testing conditions are approximate to actual conditions, the dynamic balance precision of the impeller can be remarkably improved, therefore vibration of a pump in operation is reduced, and the method is suitable for occasions having high requirements for pump vibration under special application conditions.

The invention discloses an equidistant molded surface transmission shaft which is composed of two parts. The cross universal joint of an original transmission shaft is replaced with equidistant spherical couplings ((1), (3) in figure 4). Spline connection in the original transmission shaft is replaced by equidistant arc surface connection ((2) in figure 4). The axial cross section of the equidistant spherical coupling is an equidistant spherical surface ((1) in figure 4). The radial cross section of the equidistant spherical coupling is an equidistant arc surface ((1)a-a in figure 4). During working, the torque is transmitted by using the equidistant arc surface, the axial corner deviation is adjusted by using the equidistant spherical surface, and equidistant arc surface holes are milledand ground the by using an equidistant arc surface hole machine tool.

The invention discloses a long telescoping cardan shaft. The long telescoping cardan shaft comprises a spline housing set, a spline and balancing grooves, wherein the spline is arranged inside the spline housing set and outside a spline shaft, and the balancing grooves are formed in the spline housing set and the spline shaft. The spline housing set comprises a spline housing, a jaw which is in positioning connection with the spline housing through a spigot, a reamed hole bolt and a nut. According to the long telescoping cardan shaft, the spline housing and the spline shaft are matched through the spline, and long telescoping torque transmission of an SWP-type universal coupling is achieved; and under the adjusting action of balancing blocks, the cardan shaft can still guarantee the dynamic equilibrium during long telescoping torque transmission.