74results about How to "Avoid vibration phenomenon" patented technology

This invention discloses a three-phase magnetic resistance motor, which replaces the multi-stage rotor core with a ladder-type convex pole with an ellipse two pole rotor core and utilizes a self-controlled light-coupled switch mounted on the axostyle of the rotor to realize location control and frequency self-support having the character of a self-controlled synchronous motor, and its unit volumepower reaches to over 4 times of the present one.

Disclosed is a Hamming formula-based milling stability predicting method. The Hamming formula-based milling stability predicting method is mainly applied to selecting reasonable milling parameters for part machining. The Hamming formula-based milling stability predicting method is characterized by comprising dispersing a forced oscillation period into evenly-spaced intervals through the Hamming formula to obtain the transfer matrix of a milling system, and determining the characteristic value of the transfer matrix of the milling system according to the Fourier theories to predict the stability of the milling system. During high-speed numerical controlled machining processes, the Hamming formula-based milling stability predicting method can help select reasonable milling parameters according to a stability labe graph to ensure achieve high-speed and high-efficiency machining without oscillation, thereby optimizing machining parameters, ensuring high surface quality and achieving precise machining.

The invention discloses a heat supply secondary pipe network distributed balance control system and a control method thereof. The system comprises a front-end control system and a tail-end control system and is provided with a master control machine and microcontrollers; and the system is characterized in that: the master control machine is connected with a plurality of microcontrollers through wireless communication; a first pressure transmitter, a second pressure transmitter, a header pipe flowmeter, a variable frequency pump, an electric control valve and a general packet radio service (GPRS) module are connected to the master control machine respectively; and a third pressure transmitter, a fourth pressure transmitter, a branch pipe flowmeter, a balancing control valve and a GPRS module are connected to the microcontrollers respectively. The invention has the advantages that: the pressure difference and flow of a pipe network in each building can be detected, pressure difference between an input end and an output end of the pipe network in each building is guaranteed, pressure difference between a heat supply header pipe and a backflow header pipe is guaranteed, and flow balance between the heat supply header pipe and a heat supply branch pipe is monitored simultaneously; and therefore, the secondary pipe network is operated stably, pipelines are prevented from vibrating, and the service life of the pipelines is prolonged.

The invention belongs to the technical field of hydrodynamic test simulation systems. The invention discloses an aerodynamic lift resistance testing device with a controllable and adjustable pitch angle of an airplane model. The device comprises: a trailer lift axle 1, a first monitorable locking structure 2, a front main dragging rod 3, an electric lifter 4, a rope 5, a multi-degree-of-freedom adjusting reinforcing rod 6, an axle locking structure 7, a vertical linear displacement sensor 8, a pitching posture quantitative adjusting structure 9, a test model 10, a gyroscope 11, a qualitative steel plate 12, a horizontal line displacement sensor 13 and a rigid rod structure 14. Inertia and centroid debugging accuracy of a hydrodynamic test model can be improved, and model test accuracy is improved.

The invention discloses soil environment collection extraction equipment and a soil extraction method thereof, and relates to the technical field of soil collection extraction. The equipment comprisesa power box, wherein three support rods are fixedly connected to the bottom of the power box; one end, far away from the power box, of each support rod is connected with a threaded sleeve pipe through screw threads; one end, far away from each support rod, of each threaded sleeve pipe is connected with a support foot through a screw thread; one end, far away from each threaded sleeve pipe, of each support foot is fixedly connected with an anti-slip plate; a fixing mechanism is arranged at the bottom of the power box; the bottom of the fixing mechanism is provided with an extraction mechanism.The soil environment collection extraction equipment and the soil extraction method thereof have the advantages that through the rotation of a second motor, a third rotating shaft drives an eccentricwheel to rotate; further, a fixing block drives a second connecting rod to swing to and fro; the vertical movement of a baffle plate is realized; a soil rolling pipeline is fixedly communicated witha third through hole; the goal of collecting soil by a collecting box is finally achieved; the work intensity is reduced; the layered collection is convenient.

The invention discloses a machining method for a large box body hole series and a jig cutter box. The method performs boring on an upper box body and a lower box body of a large box body, which are independent from each other, the clamping mode during machining ensures that a center line of the main shaft of a boring machine is perpendicular to the axes of the hole series, and a vertical milling head is adopted for machining the hole series. The jig cutter box comprises a strip-shaped box body; an internal spline hole matched with the vertical milling head of the boring machine is formed at the tail of the box body; thread through holes are formed at the periphery of the internal spline hole; a notch structure used for clamping a milling cutter is arranged at the head of the box body; and a plurality of threaded holes and bolts matched with the threaded holes and used for fixing the milling cutter are formed on one side of the notch structure. The machining method breaks the existing machining thinking, adopts a box body split machining mode, can effectively guarantee the machining accuracy of the large box body hole series, and solves the problems of error of the linearity and the circularity of the hole series and the like caused by the drooping of a boring rod because of the deadweight in the prior art.

The invention relates to a production line of a seal ring directly formed on a part. The production line comprises a die opening and assembling system for opening and assembling a die, an upper die picking and placing mechanism and a lower die lifting mechanism, an injection system for injecting a sizing material to the die, a curing system for curing and forming the sizing material and a transportation system which enables the die to move along stations of the production line. The transportation system comprises a production line body supporting rack and a chain transmission mechanism which drives the die to move; the die opening and assembling system, the injection system and the curing system are successively arranged along the transmission direction of the transportation system; the die is successively loaded by the die opening and assembling system, is injected by the injection system, cured by the curing system, and finally returns to the die opening and assembling system to be unloaded, so that the seal ring is directly formed on the part. The seal ring is directly formed on the surface of the part through an injection molding forming process, and the time utilization ratio and the space utilization ratio are increased in form of the production line.

The invention discloses a textile machinery damping device. The damping device comprises a mounting base, threaded holes are formed in the upper surface of the mounting base, and an anti-skid plate isfixedly connected to the bottom of the mounting base; a damping sleeve is fixedly connected to the middle of the upper surface of the mounting base, a side surface, far away from the mounting base, of the damping sleeve is provided with clamping grooves, pre-buried screws are connected inside the clamping grooves in a clamping mode, a fixing plate is arranged above the damping sleeve, a first fixing sleeve pipe fixedly communicates with the upper surface of the fixing plate, one end, far away from the fixing plate, of the first fixing sleeve pipe penetrates through the fixing plate and extends to the position above the fixing plate, and a supporting leg is arranged inside the first fixing sleeve pipe; and a buffer block is fixedly connected to the upper surface of the mounting base, a fixing groove matched with the supporting leg is formed in the upper surface of the buffer block, and the bottom of the supporting leg is fixedly connected with the inner bottom wall of the fixing groove. The textile machinery damping device has the advantages of being convenient to install and good in damping effect and facilitating market popularization.

The invention provides a processing method and a processing device for the power-down shutdown of a variable-frequency compressor. The method comprises the following steps of determining whether an oscillation waveform occurs in the waveform of the input current of the variable-frequency compressor or not when the voltage input of the commercial power is stopped; when it is determined that the oscillation waveform appears in the waveform of the input current of the variable-frequency compressor, determining whether the voltage value of a direct current bus is larger than a preset adjustment value or not; if yes, increasing the value range of a modulation coefficient; otherwise, adjusting the flux weakening control modulation rate, and increasing the overload frequency reduction rate. According to the scheme, the vibration of the variable-frequency compressor during the power-down shutdown process can be avoided.

The invention provides a machining method of a kidney-shaped round hole. The machining method comprises the steps that the centers of two arcs of the kidney-shaped round hole are determined on an outer flange of a shaft-shaped workpiece; with the centers of the two arcs of the kidney-shaped hole as the benchmark, two first initial holes are machined in the centers of the two arcs correspondingly,and allowance gaps are formed between the first initial holes and the two arcs; a plurality of first initial holes are machined between the two first initial holes in the extending direction of the side edges, connected with the two arcs, in the kidney-shaped hole; and a second initial hole is machined in a gap between every two adjacent first initial holes, and allowance gaps are formed between the second initial holes and the side edges, connected with the two arcs, of the kidney-shaped holes. The kidney-shaped hole is milled by adopting a milling cutter by taking the two first initial holespositioned in the central positions of the two arcs of the kidney-shaped hole as a starting point and an ending point correspondingly. When the milling cutter with the large suspension length is usedfor machining the kidney-shaped round hole, the precision of the milled kidney-shaped round hole can be guaranteed.

The invention belongs to the technical field of motors, and particularly relates to a motor for medical equipment. The motor comprises a motor body, a shell, a front end cover, an output shaft, a vibration reduction component and a flexible transmission component. According to the invention, the vibration reduction component is arranged between the motor body and the shell, and the flexible transmission component is arranged between the output shaft and the rotating shaft of the motor body so that vibration generated in the operation process of the motor body is transmitted to the vibration reduction component and the flexible transmission component, and the vibration reduction component and the flexible transmission component buffer and absorb the vibration. Therefore, vibration of the motor body is isolated and absorbed from the inside of the motor, the situation that the vibration is transmitted to the shell and the shell vibrates along with the motor body is avoided, stable torque transmission of the output shaft is guaranteed, the running stability of the medical instrument is improved, the running stability of the motor is guaranteed, therefore, the precision of the medical equipment is improved, and interference to a user of the medical equipment is avoided.

The invention discloses a centrifugal machine with a double-layer rotary drum structure. The centrifugal machine comprises a main shaft and a rotary drum connected with the main shaft; the rotary drum is divided into an outer rotary drum body and an inner rotary drum body, the inner rotary drum body is located inside the outer rotary drum body, and a cavity is formed by the side portion of the inner rotary drum body and the outer rotary drum body; the main shaft penetrates the cavity to be connected with the inner rotary drum body, and therefore the outer rotary drum body and the inner rotary drum body rotate in the negative directions; slant sliding ways are arranged on the inner rotary drum body and the outer rotary drum body and are communicated with the cavity, and a suction tube is arranged in the cavity; and a filtering medium is installed on the inner layer of the inner rotary drum body, a feeding tube, a scraper and a discharging hopper are contained in internal space of the inner rotary drum body, and the scraper is located nearby the filtering medium. Though the double-layer structure of the inner rotary drum body and the outer rotary drum body, solid-liquid separation is efficiently achieved, and meanwhile vibration can be effectively avoided.

The invention relates to the field of walking protection of material piling and taking machines, in particular to a walking protection device and method of a material piling and taking machine. According to the walking protection device of the material piling and taking machine, a shell is fixedly mounted on a bottom plate, and one end of a rotating shaft penetrates the shell and is mounted on the shell through a bearing; a pressure pushing plate is arranged outside the shell and is fixedly connected with one end of the rotating shaft through a swing block; a touching rotating block is arranged in the shell and is fixed to the other end of the rotating shaft in a sleeved manner; and a reset spring is arranged on the rotating shaft, and microswitches are arranged in the shell and are matched with the touch rotating block. According to a walking protection method of the material piling and taking machine, two touch positions including an alarm position and a stop position are provided, and when the pressure pushing rod is blocked by a barrier to rotate to the stop position, the microswitches send signals to a controller, and the controller directly stops walking of the material piling and taking machine. No matter how the structural mode of the material piling and taking machine is changed, mounting and detecting use of the protection device are not affected, normal operation of the device is ensured, and accident losses are reduced.

The invention belongs to the technical field of machining, and particularly relates to a non-revolution body part lathe clamp which is used for assisting a non-revolution body part to realize the lathe rotary cutting function in the non-revolution body part cutting machining process. The non-revolving body part lathe clamp comprises a clamp base body, the left end of the clamp base body is of a cylindrical structure, the right end of the clamp base body is a mounting end, a through hole is formed in the mounting end, a fixed bolt penetrates through the through hole, the part is located on themounting end, a pressing plate is arranged above the part, a tightening nut and a fixing nut are arranged on the fixing bolt respectively, the axis of the machining center of the part coincides with the axis of the outer circle of the cylindrical structure, and the rotary cutting function is realized. According to the non-revolution body part lathe clamp, the reunion of the machining axis of the non-revolution body part and the axis of the main shaft of the machine tool is realized, so that the machining precision of the part can be effectively guaranteed, the weight of the clamp is reduced compared with that of a traditional splicing clamp, so that the phenomenon of machine tool vibration caused by unbalanced weight is avoided, and the processing precision is ensured.

The invention relates to the technical field of technological equipment, and discloses a convenient-to-fix test tool for locomotive ventilator vibration detection. The test tool comprises a supporting mechanism, wherein a set of positioning mechanisms are arranged on the upper side of the supporting mechanism, each positioning mechanism comprises a supporting frame and positioning frames, a positioning base is arranged on the lower side of each supporting frame, electric telescopic rods are arranged on the two sides of each supporting frame, and each positioning frame comprises a rotating arm, a square bottom plate and a positioning rod. According to the test tool, the electric telescopic rods can drive the rotating arms to rotate after being started, the rotating arms drive the positioning rods and positioning blocks to move downwards when rotating, meanwhile, guiding rods move downwards, meanwhile, buffering springs are pressed to play a buffering role, and the guiding rods are bound in the middles of the buffering springs to play a guiding role; and when the positioning blocks perform pressing, a ventilator can be fixed, the fastening time of a worker is shortened, and the worker can conveniently detect the ventilator.

The invention discloses a drying machine. The drying machine comprises a furnace body, rotating shafts, and stirring components, wherein the furnace body is arranged in the horizontal direction; the furnace body is provided with a feed opening through which materials are added and a discharge opening through which the materials are taken out; the rotating shafts are arranged in the cavity of the furnace body in a penetrating manner; the stirring components are arranged on the rotating shafts; the stirring components are used for stirring and crushing the materials in the axial directions of the rotating shafts and in the radial directions of the rotating shafts. According to the drying machine disclosed by the invention, when the materials are dried, under the driving of the rotating shafts, the stirring components can stir the materials in the axial directions of the rotating shafts and in the radial directions of the rotating shafts, so that the materials can be rolled in the furnace body in the axial directions of the rotating shafts and in the radial directions of the rotating shafts; besides, when the materials are stirred, the materials can also be crushed to form the materials with smaller particles, so that the area of heat convection between the materials and external environment is increased, the drying efficiency of the materials is improved, and the drying effect of the materials is improved.

The invention provides a food stirring pot which is simple in structure and convenient to wash, meets sanitation grade requirements and prolongs the service life of a stirring shaft. The food stirring pot comprises a pot body and a stirrer, wherein the stirrer comprises the stirring shaft and a stirring blade arranged on the stirring shaft. The food stirring pot further comprises a stirring shaft supporting mechanism, wherein the stirring shaft supporting mechanism is arranged at the bottom of the pot body and is located below the stirring blade; the stirring shaft supporting mechanism comprises a shaft sleeve, a bearing sleeve and at least one pair of supporting rods; an annular convex ring is arranged on the top of the bearing sleeve; a plurality of circular-arch grooves are uniformly distributed on the annular convex ring. In a working process of the food stirring pot disclosed by the invention, materials generate the effect of lubricating liquid and the operation of the stirring shaft is more stable, so that a vibration phenomenon is avoided. The stirring shaft is provided with a limiting pin so that a phenomenon that the bearing sleeve is moved in the working process can be avoided and the reliability is improved. Meanwhile, when the stirring shaft is operated, certain swing amplitude appears below the stirring shaft due to clearance fit, the material materials between the stirring shaft and the bearing sleeve and the materials between the bearing sleeve and the shaft sleeve can be conveniently cleaned, and sanitation grades are met.