71results about How to "Will not cause instability" patented technology

The invention relates to a multi-phase induction motor-specific subharmonic current suppression method, which includes the following steps: (A) current reference value processing; (B) current feedback value processing; (C) current regulation; (D) voltage reference value determination. Based on the vector control of a multi-phase induction motor, the method maps the current of the multi-phase motor into a corresponding synchronous rotating reference frame of a fundamental wave and each subharmonic orthogonal to each other by multiple synchronous rotating coordinate transformations, and uses proportional-integral controllers to respectively carry out tracking with zero steady-state error and combine to form an integral current controller. The method has the advantages that trapezoidal integration is adopted to increase integral accuracy, and supplemented by variable structure control, appropriate self-adaptive compensation is introduced to resist control saturation, so that static and dynamic performance is further enhanced; the method can suppress motor loss caused by the harmful subharmonic current of the multi-phase motor and the adverse affection of torque ripple, vibration noise and the like, and can utilize the positive effect of usable subharmonic; the method takes full advantage of the multi-phase motor, and enhances system performance.

The invention discloses a tube blank bilateral reverse central spindle thrusting reducing die and process. The process comprises the following steps that: in reducing, left and right reducing dies (9, 9/) are fed and reduced to the inner side of a tube blank (13) from the external end of the tube blank (13); meanwhile, a central spindle driving system pushes left and right central spindles (5, 5/) to do reverse motion to the external end of the tube blank (13) from the inner side of the tube blank (13); and after reduction, the left and right reducing dies (9, 9/) and the left and right central spindles (5, 5/) return, and a workpiece is fetched. The left reducing die assembly and the right reducing die assembly of the die are arranged between an upper template (11) and a lower die fixing plate (25), a left guide assembly and a right guide assembly are arranged at two sides of a lower fixing die (24), and the left central spindle assembly and the right central spindle assembly are respectively arranged in the left guide assembly and the right guide assembly. According to the invention, the central spindles are taken as parts for controlling the inside dimension of the tube blank, and a body of a self driving system hydraulic cylinder, the axial space of equipment is unnecessary to increase in reducing, and the amplification of deformation force is small in reducing, and after reducing, the increase of wall thickness of the tube blank is small and the inside dimension and outside dimension of the tube blank are high in precision.

The invention discloses a laser cladding device with an adjustable cladding track and a method for adjusting the width of the cladding track. The laser cladding device comprises a laser cladding head component, a laser, a powder feeder and a central controller, wherein the cladding head is mounted on a vertical adjusting device which can drive the cladding head to move up and down in the vertical direction; a lens is arranged in the cladding head; a powder feeding pipe is mounted on the cladding head through an angle adjusting device which can adjust the included angle between the powder feeding pipe and the cladding head; and a signal transformer, a powder feeding controller and a counter are arranged in the central controller. According to the laser cladding device, the width of the cladding track can be adjusted, the powder conveying quantity and powder feeding angle can be adjusted according to the change of the cladding width while the light spot size changes, fluctuation of height and instability of the section shape of the cladding track are avoided, the laser power density remains unchanged, the thickness of a cladding layer remains unchanged, and the cladding effect is guaranteed.

A molded case circuit breaker having a contact on mechanism which can perform a trip operation and automatically rotates the handle to the on position or a position toward the on position if the handle is manipulated to move to the off (or reset) position in a state that the contacts are melt-adhered to each other, the contact on mechanism, including: a contact on plate which is vertically movable by being guided according to the operation of the switching mechanism, a trip bar that drives the restricting unit to a releasing position, a lever connected to the handle and that provides a pivot point of the handle, a lever pin fixed to the lever, for driving the restricting unit to the releasing position by pressing the trip bar, and thereby operating the switching mechanism to the trip position, and a trip spring providing an elastic driving force for enabling the switching mechanism to operate to the trip position when the restricting unit is moved to the releasing position.

The plunger type rationing and filling valve has one plunger; one plunger barrel for the plunger to be stretched in and with opening in the lower part; one valve seat in the lower part of the plunger barrel and with material gate in the upper part and corresponding to the opening in the plunger barrel, material outlet in the lower part and inside horizontal channel; and one valve core with one end connected to the operating rod and the other end with material entrance stretched into the horizontal channel in the valve seat and two inside connecting channels, which makes the material gate communicated to the material inlet or the material outlet when the valve core is turned to one of two different positions. The present invention realizes beverage filling by means of the reciprocation of the plunger, and is especially suitable for filling ropy material filling.

The invention relates to a voltage stability control circuit of a wireless power supply system. The voltage stability control circuit is electrically connected with the output end of a wireless receiving end and comprises a filter circuit, a BUCK voltage reduction circuit and a BOOST voltage boosting circuit, the BUCK voltage reduction circuit and the BOOST voltage boosting circuit are connected in a series mode, and voltage stability control is conducted on the input voltage VIN by controlling the BUCK voltage reduction circuit to work in the through mode and controlling the BOOST voltage boosting circuit to work in the voltage boosting mode; or voltage stability control is conducted on the input voltage VIN by controlling the BUCK voltage reduction circuit to work in the voltage reduction mode and controlling the BOOST voltage boosting circuit to work in the through mode, meanwhile, a power supply circuit self-starting circuit is arranged, at the moment of powering up, the self-starting circuit is started and supplies power to a drive circuit, after the voltage value of an output end CY2 gets stabilized, the output end CY2 supplies power to the drive circuit, it is guaranteed that a stable power source is provided for the drive circuit, and stability of system operation is guaranteed.

Provided is an old frame bridge dismantling method in a new-old frame bridge replacing process. An old frame bridge is divided into a plurality of annular structures to be dismantled step by step, a plate saw is used first for cutting a bottom plate and the lower portion of a stand wall along cutting lines to form concrete blocks of certain sizes, then a rope saw is used for cutting the upper portion of the stand wall and a top plate, a breaking hammer is used for breaking large concrete blocks to form small concrete blocks, and finally a loading machine is used for cleaning and conveying. Due to the fact that rope saw cutting and plate saw cutting are both non-vibration static force cutting, influence on existing lines and a railway base is minimum, railway base unstability cannot be caused, safety of passing trains cannot be affected, and accordingly safety is good. In addition, the breaking hammer is used for construction in a matched mode during cutting, construction is greatly accelerated, and construction time is shortened.

The invention discloses a positioning device with the adjustable positioning angle for pipe fitting cutting. The positioning device comprises a bottom plate, a pipe fitting, a fixing box, a mounting plate and a second supporting seat, wherein a first supporting seat is arranged at the left end of the upper portion of the bottom plate, a first ball is arranged on the inner surface of the upper endof the first supporting seat, the pipe fitting is arranged above the first supporting seat, a fixing disc is arranged above the pipe fitting, a fixing cylinder is welded to the outer surface of the fixing disc, a first supporting rod is connected to the interior of the fixing cylinder in a penetrating mode, a supporting spring is connected to the first supporting rod, a driving block is welded tothe outer end of the first supporting rod, supporting frames are installed at the front end and the rear end of the fixing disc, and the rear end of the fixing disc is connected with the output end ofa driving motor. According to the positioning device with the adjustable positioning angle for pipe fitting cutting, the supporting angle can be conveniently adjusted, automatic propelling can be achieved, further cutting of a pipe fitting is facilitated, and the cutting position can be stably supported conveniently.

The present invention relates to a multithread minor diameter long auger drilling wall forming machine. Said invention adopts portal shaped piledriver side-by-side set at least auger stems, lower end set drill, top connected with spacer, spacer slip connection with portal shaped piledriver, spacer set rotating power unit, auger stem connected with rotating power unit, auger stem being hollow in middle part, connected with concrete delivery pipe, guideway set below the chassis. Said invention solves uneven soil stirring, weak intensity, inefficiency etc shortage.

The invention discloses a foot type wall-climbing robot. The foot type wall-climbing robot comprises a body and a plurality of mechanical legs. Each mechanical leg comprises an active posture adjusting piece, a passive posture adjusting piece and a fixed connecting piece, the active posture adjusting piece is provided with a connecting end and a free end, the connecting end is connected with the body, and the free end is connected with the fixed connecting piece through the passive posture adjusting piece; the passive posture adjusting piece can passively change the structure of the passive posture adjusting piece under the acting force of the fixed connecting piece and the walking surface so as to adjust the posture of the fixed connecting piece to be attached and fixed to the walking surface. The body is provided with a belly side, a back side and a gas control assembly, when the foot type wall-climbing robot walks, the belly side faces the walking surface, the back side deviates from the walking surface, and the gas control assembly is used for generating acting force capable of enabling the belly side to be close to the walking surface by controlling flowing of surrounding gas. The foot-type wall-climbing robot provided by the embodiment of the invention does not cause instability of the posture of the robot during walking, and the control difficulty is reduced.

The invention discloses a coalbed methane horizontal well underbalance drilling system and a method thereof. The coalbed methane horizontal well underbalance drilling system comprises a casing pipe, adrill rod, a fluid director, a top drive, degassing valves, a water-gas mixing supply unit and a three-phase separator. According to stable underbalance drilling, the displacement and the pressure ofcompressed air are adjusted according to the displacement and the pressure of drilling fluid, a certain proportion of compressed air is injected into the drill rod, and the compressed air is separated from a coal seam borehole far away from the position of a drill bit through the set of degassing valves installed on the drill rod and rapidly expands. Expanded air bubbles ascend and continuously expand, the expanded air bubbles can replace or discharge drilling fluid with the same volume, and the density of the compressed air bubbles is far smaller than that of the drilling fluid, so that thedensity of a fluid in an annulus channel is reduced, and the pressure of an annulus liquid column acting on the coal seam borehole is reduced; and in this way, an underbalance or near-balanced drilling state that the pressure of the annulus liquid column acting on the coal seam borehole is smaller than or approximately equal to the coal seam gap pressure is formed.

The invention provides a method and device for dynamically configuring the connection of an Internet of things and belongs to the Internet of things technical field. The method includes the following steps that: a device to be connected nearby is searched; the identification number of the device to be connected is obtained; the interface configuration file of the device to be connected is obtained from a cloud server according to the identification number; the interface configuration file is analyzed; an Internet-of-things device is connected with the device to be connected according to the interface configuration file; and the Internet-of-things device is connected with the cloud server according to the interface configuration file. The method and device of the invention have the advantages of high interoperability and great simplicity in Internet-of-things access. With the method and device adopted, the instability of application software will not be brought about, and the instability of a network system and network permanent paralysis can be effectively avoided.

The invention provides a method for simultaneously detecting inorganic tin and organotin compounds through low pressure ion chromatography-inductively coupled plasma-mass spectrometry. Analysis devices comprising a low pressure pump, a six-way injection valve, a sample introduction ring, a cation separating column and an inductively coupled plasma mass spectrometer are adopted. The method comprises the following steps: 1, plotting a baseline; 2, platting the spectra of the inorganic tin and the organotin compounds in a sample; 3, plotting the spectra of the inorganic tin and the organotin compounds in a standard sample, and drawing the working curves of the inorganic tin and the organotin compounds; and 4, calculating the concentrations of the inorganic tin and the organotin compounds in the sample. The method can be used to simultaneously detect the concentrations of total inorganic tin, monomethyltin trichloride, dibutyltin dichloride, diphenyltin dichloride, trimethyltin chloride and tributyltin chloride in the sample.

A method for remote speed regulation of a stepping motor is achieved by a device composed of a rectification control unit and a speed regulation unit. The rectification control unit is used for inputting a single-phase 220V alternating current power supply, outputting a controlled rectification voltage subjected to voltage drop by a transformer and sending a speed control signal comprising a motor running direction and a running speed level in the controlled rectification voltage; the speed control signal comprises a speed data wave composed of direction guide waves of three power frequency periods and a plurality of power frequency periods; and the speed regulation unit is used for inputting the controlled rectification voltage containing the speed control signal and controlling the speed of the stepping motor. In the method, a remote controller is not needed, a control line is unnecessarily and independently laid, a single-phase power line is directly used for transmitting the speed control signal, and remote control and regulation on the speed of the stepping motor can be achieved.

The invention discloses a primary frequency modulation method of a thermal power generating unit with no dead zone and automatically variable speed regulation. The primary frequency modulation capacity of a thermal power generating unit requires further improvement to fulfill the background requirements of ultra-high voltage power transmission landing, progressively increasing new energy occupation, large-scale transformation of the economic structure and the like. According to the method, an automatically sampled function is constructed for the speed regulation by eliminating a dead zone on the full frequency domain, so that part of serious work conditions in the dead zone can be screened and subjected to frequency modulation, and the speed regulation out of the dead zone is linearly changed along with frequency, and the influence of main steam pressure and temperature is concerned. According to the method, the primary frequency modulation capacity of a thermal power generating unit can be improved, the damage of a speed regulation system due to over-frequent operation cannot be caused, and the stable safety performance of the unit cannot be reduced.

A remote speed regulation device of a direct current brushless motor comprises a rectification control unit and a speed regulation unit, wherein the rectification control unit comprises a transformer, a control power supply module, a controlled rectification module, a zero-cross detection module, a singlechip control module, a trigger control module and a speed given module and is used for inputting a single-phase 220V alternating current power supply, outputting a controlled rectification voltage with an output voltage valid value less than 220V, and sending a speed control signal composed of a guide wave and a data wave in the controlled rectification voltage; and the speed regulation unit comprises a regulation power supply module, a waveform sampling module, a singlechip regulation module and a motor driving module and is used for controlling the speed of the direct current brushless motor according to the speed control signal in the controlled rectification voltage. In the device, a remote controller is not needed, a control line is unnecessarily and independently laid, a single-phase power line is directly used for transmitting the speed control signal, and remote control and regulation on the speed of the direct current brushless motor can be achieved.

The invention discloses a cased well ground signal bidirectional wireless electromagnetic transmission device and a cased well ground signal bidirectional wireless electromagnetic transmission method, and belongs to the technical field of oil-gas field development. When underground data are uploaded, an upper short section I serves as an electromagnetic signal receiving short section, and a lower short section II serves as an electromagnetic signal transmitting short section; when the TM wave transmitting antenna in the short section II generates an alternating magnetic field in the magnetic core through alternating current, the magnetic core on the short section I of the electromagnetic signal receiving short section can capture the current signal so as to upload the signal; similarly, when ground data is downloaded, the short section II serves as an electromagnetic signal receiving short section, the short section I serves as an electromagnetic signal transmitting short section, and when the TM wave transmitting antenna in the short section I generates an alternating magnetic field in the magnetic core through alternating current, current signals are captured in the short section II to complete signal downloading and bidirectional signal transmission between the short section I and the short section II. Compared with the prior art, under the condition of the same transmission distance, the received signal amplitude is larger, and the carrier frequency is higher.

An apparatus of remotely adjusting the speed of multiple DC brushless motors includes a rectification control unit and multiple speed adjusting units. The rectification control unit includes a transformer, a control power supply module, a controllable rectification module, a zero-crossing detection module, a single-chip microcomputer control module, a trigger control module, and a speed giving module. The rectification control unit inputs a single-phase 220V AC power source, outputs a controllable rectification voltage that has undergone voltage reduction by the transformer, and sends in the controllable rectification voltage speed control signals including motor running directions and running speed levels. Each speed adjusting unit includes an adjusting power supply module, a waveform sampling module, a single-chip microcomputer adjusting module, an address giving module and a motor drive module, and controls the speed of DC brushless motors on the basis of the speed control signals in the controllable rectification voltage. A remote controller is not needed by the apparatus, a control line needs not to be individually laid, a single-phase power line can be directly utilized to transmit the speed control signals, and the speed of the DC brushless motors can be controlled and adjusted in a remote manner.

The invention discloses a prefabricated fast assembled enclosure structure and a construction method thereof. The enclosure structure comprises enclosure plates, vertical columns and enclosure foundations; the vertical columns are fixed to the enclosure foundations, and each enclosure plate is fixed between every two connected vertical columns; the enclosure foundations comprise foundation platesand anchoring nails, and pre-embedded screw rods with the top stretching out are pre-embedded in the foundation plates; and reserved grooves are formed in the vertical columns, and the left ends and the right ends of the enclosure plates extend into the reserved grooves of the vertical columns and are fixed into the reserved grooves of the vertical columns. The pure dry connection mode is designed, wet operation is avoided, and construction is fast and convenient.

The invention relates to a control system for a blow molding air channel. The control system comprises a pre-blowing pipeline and a forming pipeline, wherein one ends of the pre-blowing pipeline and the forming pipeline are communicated with an air source while the other ends are both communicated with a to-be-prepared container; an air supply valve, a pre-blowing pressure-adjusting valve, a pre-blowing air tank and a pre-blowing valve are arranged on the pre-blowing pipeline in turn; a forming valve is arranged on the forming pipeline; besides, the control system further comprises a recovering pipeline and an exhausting pipeline; one ends of the recovering pipeline and the exhausting pipeline are communicated with the to-be-prepared container; an exhausting valve and a silencer are arranged on the exhausting pipeline in turn; a recovering valve, a recovering air tank and a check valve are arranged on the recovering pipeline in turn; the other end of the recovering pipeline is connected with an air return pipeline and an air supply pipeline; the other end of the air return pipeline is connected with the pre-blowing pipeline, with the joint of the air return pipeline and the pre-blowing pipeline is located between the air supply valve and the pre-blowing valve; an air supply pressure-adjusting valve and an air supply tank are arranged on the air supply pipeline in turn along the air flowing direction; and the other end of the air supply pipeline is connected with the other low-pressure air-consuming component. The control system provided by the invention is suitable for the production of a plastic container.