10results about How to "Prevent reverse" patented technology

The invention relates to an innovative method for transversely assembling a PEM electrolytic cell and a matched device thereof, which are specially used for solving the problems of tedious steps, easiness in dislocation of parts, low assembling efficiency and the like in the traditional assembling process. According to the method, the assembly process is simplified, and the advanced viscose hot pressing technology and vulcanization bonding technology are adopted, so that firm connection among the anode frame, the membrane electrode and the cathode frame and stable combination of the bipolar plate and the membrane electrode assembly are ensured. Besides, the device comprises an assembling platform, a stacking device, an extruding and fixing device and an adhesive hot-pressing device, and the design of the devices ensures the accurate position and sequence of the parts in the assembling process, so that the problems of dislocation and reversing are avoided, and the assembling precision is remarkably improved. Through the improvements, the production efficiency and the product quality of the PEM electrolytic bath are greatly improved, the production cost is effectively reduced, the market competitiveness is enhanced, and the PEM electrolytic bath has important industrial application value.

This invention discloses a creep control method and device for a new energy heavy-duty truck, belonging to the field of new energy vehicle control technology. The method includes the following steps: in response to vehicle power-on, determining whether the vehicle is currently in a creep basic state, and if the doors are closed and the driver is in position, entering a creep waiting-to-recognize state; in the creep waiting-to-recognize state, if it is detected that the accelerator pedal is depressed beyond a preset opening degree and then released and returned to zero opening degree, then a creep power latch flag is set to an active state; when the creep power latch flag is active, the corresponding creep mode is activated according to the current vehicle gear information, the creep mode including a forward creep mode and a reverse creep mode; during creeping, creep torque is feedforward compensated according to the real-time slope value; when any one of the preset exit conditions is met, the creep mode is exited; wherein, if the met exit condition includes a creep basic state failure, the creep power latch flag is set to an inactive state. This invention improves the safety and driving smoothness of creep control under complex working conditions.

The utility model relates to the related technical field of animal feeding, in particular to an independently ventilated guinea pig cage for experiments, which comprises a cage body, an isolation plate is arranged on the cage body, a buckle is arranged outside the cage body, a cage cover is arranged on the cage body, a sealing mechanism is arranged in the cage cover, a conveying mechanism is arranged in the isolation plate, and a kettle is arranged outside the isolation plate. According to the independent ventilation cage, through the arrangement of the cage body, the isolation plate, the buckle, the cage cover, the sealing mechanism, the conveying mechanism, the kettle and the fixing plate, when ventilation is conducted on the cage, a ventilation pipe is inserted into a ventilation column firstly and then continues to be inserted, at the moment, a spring on the pressing column is compressed due to insertion of an air inlet pipe, an air inlet is exposed, and then clean air can be pumped into the cage; the filter screen can prevent reverse pollution, the column is pressed to return after the pipe is pulled out, polluted gas in the cage is prevented from escaping, the exhaust method is similar, but the filter screen of the exhaust valve needs to be taken out in advance, otherwise, the gas is blocked and cannot be exhausted, and therefore the sealing performance is guaranteed.

The utility model discloses a building floor structure paved by stone, and belongs to the technical field of marble and granite paving treatment. The building floor structure paved by the stones sequentially comprises a composite stone layer, a cement mortar layer, a cement mortar leveling layer, a fine aggregate concrete leveling layer, a neat cement mortar layer and a floor base layer from top to bottom, wherein the composite stone layer comprises at least two composite stone blocks, and each composite stone block sequentially comprises stone, an epoxy resin bonding layer and an anti-skid floor tile from top to bottom. According to the paving method provided by the utility model, endogenous alkali can be prevented, long-term stable use of the stone after paving is realized, and the problem that alkali efflorescence is easy to occur when the existing stone is used is solved.

The application provides a contactor, relates to the technical field of switches, and is used for reducing the possibility that the circuit board in the prior art cannot meet use requirements. The contactor comprises a base, a circuit board assembly and a plurality of conductive pieces, wherein the base has a containing cavity. The circuit board assembly is arranged in the containing cavity, and the circuit board assembly comprises a first circuit board and a second circuit board. One end of at least two conductive pieces is electrically connected with the first circuit board, and the other end of the at least two conductive pieces is electrically connected with the second circuit board. One end of the remaining at least two conductive pieces is electrically connected with the circuit board assembly, and the other end of the remaining at least two conductive pieces is electrically connected with the end part of a coil possessed by the contactor.

The application provides a grid type pipeline ventilation method suitable for downward drift filling stope, which comprises the following steps: carrying out grid type pipeline ventilation scheme design of the downward drift filling stope, constructing a one-layer one-step drift stope X, Y and Z three-way pipeline ventilation system, constructing a one-layer two-step drift stope X, Y and Z three-way pipeline ventilation system, and constructing a one-layer below drift stope Y and Z way pipeline ventilation system to form an overall grid type pipeline ventilation system. The application can effectively solve the problem that the downward drift stope has no independent return air channel and is difficult to form through air flow, guarantee the safety of stope operation, save engineering quantity and reduce cost; the local ventilator does not need to be moved multiple times, and the air flow can be prevented from reversing at the same time; the grid type pipeline ventilation system can return air in multiple ways, and the air resistance is small, the air speed is high, and the efficiency is high.

Aiming at the problem of unstable film transfer in the prior art, the invention provides the film transfer clamp which has a high-hardness structure and can fix the sponge, the ceramic plate is used for replacing a traditional plastic plate, so that the film transfer clamp has very high rigidity and thermal conductivity, and the whole clamp plate is ensured not to be distorted; due to the design that the sponge is directly adhered to the ceramic plate, the operation is simplified, and more stable pressure is provided for a transfer film compound; the plastic shell enables the ceramic plate to be buffered and protected, and the color of the plastic shell prevents the film transfer clamp from being reversely placed; large holes and small holes are uniformly formed in the ceramic plate at intervals, so that the electric field intensity is more uniform, and the membrane transfer efficiency is higher; the annular magnet design at the top of the plastic shell provides a stable supporting structure for the ceramic plate; meanwhile, the annular magnet serves as a switch for installing and removing the ceramic plate into and out of the plastic shell, and the left end and the right end of the annular magnet are dispersedly designed, so that the film rotating clamp is easy to open and close.

The utility model discloses a gear shaft mistake-proof positioning tool and gear shaft machining equipment. The gear shaft mistake-proofing positioning tool comprises a positioning block, the positioning block is provided with a mistake-proofing groove, the groove milling end of the gear shaft is inserted into the mistake-proofing groove, the groove milling end is provided with an identification flat face, and the inner side face of the mistake-proofing groove is attached to the identification flat face. A positioning shaft is further arranged at the end, facing the gear shaft, of the positioning block, a positioning hole is formed in the groove milling end of the gear shaft, and the positioning shaft is inserted into the positioning hole. The positioning shaft is arranged on the positioning block, so that the positioning shaft can penetrate into the positioning hole of the gear shaft, and the gear shaft can rotate relative to the positioning block. When the identification flat face of the gear shaft rotates to correspond to the inner side face of the mistake-proofing groove, the gear shaft can be inserted into the mistake-proofing groove, the inner side face of the mistake-proofing groove can abut against the identification flat face, positioning of the gear shaft is achieved, follow-up machining of the gear shaft is facilitated, the gear shaft mistake-proofing positioning tool can prevent the gear shaft from being placed reversely, and the yield of the gear shaft can be increased.

The application relates to the technical field of circuit control, in particular to a control circuit and method of an interleaved parallel three-phase rectifier and a charging pile. The control circuit comprises a signal processing module, a phase-locked loop, a loop control module, a comparator module and a pulse generation module. The comparator module is used for outputting six zero-crossing signals based on six inductance currents of a main phase and a slave phase and built-in programmable thresholds. The pulse generation module is used for generating main-slave staggered carriers with a phase difference of 180 degrees based on the main phase zero-crossing signal, and generating and outputting 12 driving pulses based on the main-slave staggered carriers, a three-phase modulation signal, an angle and the six zero-crossing signals. The conduction of the driving pulses is triggered by the zero-crossing signal to clear the carrier counter, and the turn-off is generated when the carrier count value reaches the turn-off threshold corresponding to the three-phase modulation signal. In conclusion, the technical scheme provided by the application can realize CRM control of the interleaved parallel three-phase rectifier and improve the current control stability.

The invention provides an improved instruction distribution calculation method and system considering large change of wind and light resources in a frequency modulation process, electronic equipment and a medium, and belongs to the technical field of power system frequency stability control, and the method comprises the following steps: S1, building a control architecture and a classical instruction distribution calculation method applied to a wind and light storage new energy station; s2, establishing a frequency modulation instruction distribution calculation method considering the great change of wind and light resources in the frequency modulation process; and S3, carrying out dynamic response characteristic modeling on the wind power unit, the photovoltaic unit and the energy storage unit, converting into a discretization model in a time domain according to a finite difference method, and carrying out power output on the wind power unit, the photovoltaic unit and the energy storage unit in combination with the frequency modulation instruction distribution calculation method in the step S2. According to the method, correct calculation and allocation of frequency modulation instructions under different wind and light resources can be realized, and the frequency supporting capability of a new energy station is improved.