33results about How to "Solve safe operation" patented technology

A high-safety induction-type crane is composed of the main crane body and the induction-type proximity switches installed to both end of the end sills at both sides of main crane body. Said proximity switches are serially connected to the running controller of crane.

The invention discloses a processor for electriferous foreign bodies on conducting lines and ground lines of high voltage transmission lines, which comprises a supporting frame with a door which can automatically buckle, an idler pulley which is arranged above the interior of the supporting frame and can rotate freely in the vertical direction, longitudinal round-ring upper cutters which are respectively fixed to the left side and the right side of the pulley, a pallet which is arranged under the supporting frame through a longitudinal connecting shaft and a horizontal round lower cutter which is fixed under the pallet. The upper part of the connecting shaft and the supporting frame are connected through a bearing which is sleeved on the connecting shaft; the pallet is fixed to the lower end of the connecting shaft; a groove which is used for the movement of the conducting lines and the ground lines is arranged on the pulley along the periphery of the pulley; the supporting frame is arranged with at least one lifting ring; a hanging ring which is used for fixing insulating rope is arranged below the lower cutter. The processor for electriferous foreigner bodies has the advantages of low cost, simple structure and simple and easy usage and operation and can work under the condition of uninterrupted power supply, with good security performance.

The invention discloses a driver controller for the traction system of an EMU, which includes a driving gear, a limiting plate, and a handle. A limiting rod is fixed on the driving gear. The upper part of the stop rod is sleeved in the cavity and the two are connected by a spring. The connector is provided with a limit slot along the length of the handle. The limit screw is fixed in the area of ​​the limit slot on the limit rod. The connector is along the vertical direction. A roller shaft is fixed in the direction of the handle, a rolling bearing is sheathed on the roller shaft, and a side roller is respectively sheathed on the rolling bearing at the positions on both sides of the limiting plate. In the traction system of an EMU according to the present invention, the driver controller adds side rollers on both sides of the rolling bearing to slide with the limit plate in an orbital manner, and uses the cooperation between the two sides of the side rollers and the two sides of the limit plate to eliminate the original torsion The shear stress ensures the operational reliability of the LC handle assembly, thereby improving the reliability of the driver's controller.

The invention provides an electric transport circuit cotter inspect assembly, including a tool box, the inside of the tool box is provided with a hold space; a first insulation rod, a first end of the first insulation rod is provided with a first operation unit; a mirror, the mirror is installed on the first insulation rod and is coordinated with a first installation unit, and the face of the mirror is apart from the first insulation rod; a second insulation rod, the first end of the second insulation rod has a second operation unit, the second end of the second insulation rod has a second installation unit; an installation block the installation block is installed on the second installation unit, the installation block atop is provided with a cotter installation groove, the length of the cotter installation groove is smaller than the length of the cotter in order to make the open end of the cotter to be exposed outside the cotter installation groove. The technical scheme effectively solves the problem that lack of the cotter in the electric transport circuit causes threat to safe transport of the electric transport circuit.

The present invention discloses a novel line temperature transmission device used for leading the current of the secondary winding of a CT (current transformer) to a heating resistor loop in line temperature measurement of the power transformer. The device includes a current acquisition module for acquiring the current of the secondary winding of the CT, a control circuit and an alternating-current constant current source circuit for leading output current to the heating resistor loop; the control circuit comprises a central processing unit and a liquid crystal display module; the alternating-current constant current source circuit is connected with the central processing unit through a serial communication circuit; the current acquisition module is connected with the central processing unit; and the liquid crystal display module is connected with the central processing unit. According to the novel line temperature transmission device of the invention, a current acquisition sensor is adopted to acquire the current of the secondary winding; the central processing unit processes acquired current data and communicates with the alternating-current constant current source circuit so as to control the magnitude of output current, so that the output current of the alternating-current constant current source circuit and acquired input current can be synchronous and consistent, and therefore, the risk of the open circuiting of the secondary winding of the CT can be lowered, and the stability of a transformer system can be improved.

The invention relates to a converter oxygen lance blowing control method based on the dry dedusting process. The method comprises the following steps: when a converter oxygen lance begins to blow or begins to blow, then stops normally and continues to blow, the opening of an oxygen regulating valve is controlled to 50-70% for a certain time and a feeding valve actuator performs automatic regulation; when the converter oxygen lance re-blows in the back stage of the blowing, the oxygen regulating valve is preset to have an automatic initial valve opening and then the feeding valve actuator performs automatic regulation; and when the converter oxygen lance is interrupted by a fault and blows again, the opening of the oxygen regulating valve is fast controlled to 75%-85% for a certain time and the feeding valve actuator performs automatic regulation. By adopting the invention, the contents of O2 and CO in the fume gas can be effectively inhibited or controlled, the changes of the contentsare limited within a safe operation range of the deduster and the safe operation problem of the main devices for dry dedusting is solved.

The invention discloses a helicopter rotor model icing wind tunnel test method, which belongs to the technical field of wind tunnel tests; the invention mainly uses the icing wind tunnel system to realize the icing effect, and combines the helicopter rotor test platform to measure the aerodynamic performance of the helicopter rotor ; Based on a large-scale icing wind tunnel and a helicopter rotor wind tunnel test platform, the present invention first proposes a helicopter rotor model icing characteristic test method, standardizes the helicopter rotor wind tunnel test process, and can achieve high quality, high efficiency, safety and reliability It can conveniently and accurately evaluate the influence of icing on the aerodynamic performance of the helicopter rotor model, and can provide powerful wind tunnel test data for the research on helicopter rotor icing in my country.

The invention relates to a wind path structure of an air-cooling steam turbine generator. The wind path structure comprises a stator base wind path, a rotor wind path, a cold air area and a hot air area arranged under a stator base, and an electric brush wind path. The stator base wind path comprises a stator ventilation pipe arranged on the stator base and a radial ventilating duct group in symmetrical and vertical distribution in the stator base with the center of the stator base being a symcenter. The rotor wind path comprises an axial air duct, a gap between a stator and a rotor, and a first axial-flow type fan and a second axial-flow type fan which are arranged at the two ends of the rotor respectively, wherein the axial air duct is communicated with the gap between the stator and the rotor; and the rotor wind path is communicated with the stator base wind path. The wind path structure divides the air flow into multiple strands to allow cold air to be contacted with all heating parts of a generator as much as possible; the stator end portion and rotor end portion, which have higher temperature rise, of the generator are cooled preferentially, and then, the generator body portion is cooled; and therefore, each part of the generator can be cooled uniformly.

The invention provides a magnetron disturbance line selecting method of an arc extinguishing coil, wherein the method relates to the field of a power grid. When a non-instantaneous single-phase grounding fault of the power grid system occurs, a conduction angle of a bridge type rectifier in a magnetic resistance control device is gradually adjusted. Saturation at an iron core magnetic valve can bequickly realized, and reactive current disturbance of the arc extinguishing coil can be quickly realized. A fact that the reactive current output from the arc extinguishing coil is higher than capacitive current of the power grid system is realized. Hereon the arc extinguishing coil is in an over-compensation state. Through comparing data of three-phase voltage over a bus before and after starting the magnetic resistance control device, a fault line is selected according to a principle that abrupt change current only flows over the fault line and increases voltage output of the fault line; and then the fault line is recovered. The method settles problems of an inter-phase shorcircuit fault and safe system operation incapability caused by an under-compensation state of the arc extinguishing device when the non-instantaneous single-phase grounding fault of the power grid system occurs.

The invention provides an inverter controlling method and device. The control method comprises the steps that each switching tube is controlled according to the control sequence of a control cycle; atthe beginning of a control cycle, firstly the first switching tube of a leading arm is controlled to be turned on, and after the first switching tube of the leading arm is turned on for a first set time, the second switching tube of a lagging arm is controlled to be turned on; when the second switching tube of the lagging arm is turned off, the second switching tube of the leading arm is controlled to be turned on, and after the second switching tube of the leading arm is turned on for the first set time, the first switching tube of the lagging arm is controlled to be turned on; when the first switching tube of the lagging arm is turned off, the control cycle ends; the turn-on time of each switching tube in the same control cycle is the same; and the turn-on time of each switching tube islonger than the first set time. According to the technical scheme provided by the invention, when each switching tube in an inverter is turned off, the voltage and current thereof are zero; and the problem that the safe operation of the inverter is affected by a hard switching phenomenon when the full-bridge inverter is controlled in the prior art is solved.

The invention discloses a vibrating damping pipe bracket for a longitudinal pipeline. The vibrating damping pipe bracket is characterized by comprising a pipe clamp (1), wherein multiple groups of clamping rings are connected to the pipe clamp (1); the clamping rings are connected through fastening bolts (2) so as to be tightly clamped on a vertical pipeline; a stopper (4) is welded on the vertical pipeline; fixing plates (9) are connected to two sides of the pipe clamp respectively, each fixing plate is connected with a sliding supporting leg (6), the lower end of the sliding supporting leg is hinged to a base (6-3) through a hinged shaft (7), an upper base plate (8-1) is arranged on the upper part of the fixing plate, an upper damping cushion block (5-1) is arranged between the upper base plate (8-1) and the fixing plates, a lower damping cushion block (5-2) is arranged between a lower base plate (8-2) and the fixing plates (9), the lower base plate (8-2) is arranged on the lower part of the fixing plates, and the upper damping cushion block (5-1) and the lower damping cushion block (5-2) are positioned through respective fasteners (11). The vibrating damping pipe bracket is simple in structure and convenient to manufacture and mount and provides ideal supporting equipment for vibration damping of the vertical pipeline.

The invention discloses a wind tunnel test method for active control of helicopter rotor noise based on trailing edgelets, which belongs to the technical field of wind tunnel tests and mainly relies on aeroacoustic wind tunnels, a rotor model acoustic test platform and a trailing edgelet-based Rotor active control test model, to carry out research on the influence of trailing edgelet active control on rotor noise. This test method first standardizes the test process of active control of rotor noise based on the trailing edge winglet, and can carry out wind tunnel test research with high efficiency, high quality and safety. Then it solves the problem of safe operation of the rotor model during the active control of the trailing edgelet. Finally, a rotor control method, trailing edgelet active control method, noise data acquisition, analysis and transmission method during the rotor model test with trailing edgelet active control are established, which can conveniently and accurately evaluate the trailing edgelet The effect of active control on the noise characteristics of a helicopter rotor.

The present application discloses a converter and its operation monitoring method. The converter operation monitoring method includes: acquiring the AC side voltage and the DC bus capacitor of the converter during the precharging process of the DC bus capacitor of the converter voltage; determine the actual capacitance of the DC bus capacitor according to the obtained AC side voltage and the DC bus capacitor voltage; when the actual capacitance of the DC bus capacitor is less than the preset ratio of the rated capacity of the DC bus capacitor In this case, a warning message is issued. This application obtains the AC side voltage of the converter and the DC bus capacitor voltage during the precharging process of the DC bus capacitor of the converter, calculates the actual capacitance of the DC bus capacitor, and then calculates the actual capacitance of the DC bus capacitor When it is less than the preset ratio of the rated capacity of the DC bus capacitor, an alarm message is issued, so that the user can maintain the DC bus capacitor in time, and eliminate the potential safety hazards in the wind power system caused by the DC bus capacitor.

The invention discloses a ring type safe plier connecting rod pulling mechanism which is suitable for ring type elevators. The ring type safe plier connecting rod pulling mechanism comprises a speed limiter rope dragging mechanism, a left safe plier pulling mechanism, a right safe plier pulling mechanism, a left linkage mechanism and a right linkage mechanism, the speed limiter rope dragging mechanism, the left safe plier pulling mechanism and the right safe plier pulling mechanism are installed on an arc-shaped bottom plate and an arc-shaped side plate which are mutually connected and arranged on the inner side of a lift car, the left safe plier pulling mechanism and the right safe plier pulling mechanism are distributed on the left and right sides of the speed limiter rope dragging mechanism respectively, the speed limiter rope dragging mechanism is respectively connected with the left safe plier pulling mechanism and the right safe plier pulling mechanism by the aid of the left linkage mechanism and the right linkage mechanism, namely, when the speed limiter is operated, by the aid of the left linkage mechanism and the right linkage mechanism, the speed limiter rope dragging mechanism synchronously drives the left safe plier pulling mechanism and the right safe plier pulling mechanism to perform pulling actions for corresponding safe pliers. The ring type safe plier connecting rod pulling mechanism has the advantages of being simple in structure, high in braking accuracy and good in reliability.

The invention discloses a method for suppressing the transient DC bias of a three-port isolated DC / DC converter, first analyzing the formation mechanism of the TAB transient DC bias under traditional phase-shift control, and determining the formation of the TAB transient DC bias Reason; based on the formation reason, establish its DC bias suppression mathematical model; determine the driving signal combination method that satisfies the DC bias suppression mathematical model, and suppress the transient DC bias. To establish the mathematical model of DC bias suppression, first determine the equivalent circuit of TAB when the voltage of each port acts alone according to the Y-type equivalent circuit of TAB, and then obtain the current expression of each port of TAB by the superposition theorem, assuming that the unit switching period when the phase shift angle changes The volt-second product of the positive and negative amplitudes of the square wave voltages at ports 2 and 3 is zero, and the inductance can still achieve volt-second balance. The current relationship before and after the phase shift angle is obtained, and then the TAB DC bias suppression mathematical model is obtained. . The problem that the transient DC bias affects the safe operation of TAB is solved.