188results about How to "Won't add weight" patented technology

The invention relates to a graphite-paraffin composite phase-changing and energy-storing concrete and a preparation method thereof. In the phase-changing and energy-storing concrete, cement, water, sand, gravels and a water reducer are used as substrates, and paraffin phase-changing materials, graphite with enhanced heat conducting function, and fiber reinforced materials with enhanced mechanical strength are also comprised. The preparation method comprise the steps of: firstly, mixing the paraffin and the graphite, heating until the paraffin totally melts, and continuously stirring to uniformly mix the paraffin and the graphite into a viscous form; putting the sand and the gravels into a stirrer, then putting fibers and the cement, carrying out dry mixing, adding the water and the water reducer subsequently, and rapidly stirring to reach a uniform state; and then putting the molten paraffin-graphite viscose mixture into the obtained concrete mixture, and uniformly mixing. Because the graphite is added into the paraffin to be used as an additive, the coefficient of heat conductivity of the phase-changing and energy-storing concrete is greatly enhanced, so that the heat storing and releasing efficiency of an energy-storing material is enhanced.

The invention discloses a protective sealing door for an underground refuge chamber. The protective sealing door comprises a door frame and a door plate, wherein the door plate is arranged on the door frame through a rotation shaft; a locking mechanism for locking the door plate on the door frame is arranged on the door plate, a plurality of first reinforcing ribs for reinforcing the strength of the door plate are arranged in the door plate; heat-insulating materials, namely aerogel heat-insulating felts are filled among the reinforcing ribs; at least two annular sealing rings, namely flame-resisting sealing rings are arranged at the joint of the door plate and the door frame; and the periphery of the door plate is locked by the locking mechanism. According to the protective sealing door, the aerogel heat-insulating felts which can bear the temperature of 1,400 DEG C to the maximum are filled in the door plate, so that the door plate can resist high temperature generated during explosion, and the high temperature is insulated out of the refuge chamber; at least two sealing rings which are made of flame-resisting, anti-static, high temperature-resisting and oil-resisting materials are arranged on the contact surface of the door plate and the door frame, so that the protective sealing door has a good sealing effect.

The invention relates to a floating platform for a mooring hot air airship. The floating platform comprises a capsule, a nacelle, an anchoring vehicle, a control system, and surface equipment; the capsule is connected with the nacelle through a pendant rope; and a mooring cable is connected with an intersection point at the lower end of the pendant rope and is arranged in the anchoring vehicle. The mooring cable is wound on a hydraulic pressure winch through a positioning disk; and the positioning disk and the hydraulic pressure winch are fixed on the anchoring vehicle. A mooring hot air balloon is released into the air 2,000 m high for carrying a communication base station in a remote operation mode, and quick deployment can be performed at a certain area, so that a smooth communication signal can be guaranteed at emergency and the floating platform has monitoring and detection functions. The floating platform for the mooring hot air airship has the advantages of low use cost, safety and reliability and the like, and is easy to operate and maintain.

The invention discloses a dual-redundancy control method and system of a brushless motor. A Hall position sensor position signal and a Hall position sensorless position detection signal of the motor are fused to achieve reversing control cover the motor, and the reliability of the motor is improved. Different from the existing dual-redundancy motor technology, the dual-redundancy control method and system achieve dual redundancy of the motor only in an electronic control mode without changing an original motor mechanism. The method can improve the reliability of the motor and meanwhile cannot increase the weight of the motor or change the motor structure, so the requirements for high reliability, light weight and lower cost of the motor in the aviation field can be well met.

The invention relates to a precompensation method for in-band group delay fluctuation of a satellite navigation signal generating system, which comprises the following steps: (1) measuring a combined S parameter of a modulator, a filter and an amplifier in the satellite navigation signal generating system, and determining amplitude-frequency and group delay characteristic of the combination of the three devices; (2) counting the group delay characteristic of a precompensation filter according to the combined group delay characteristic; (3) obtaining the phase-frequency characteristic of the precompensation filter; (4) setting the phase-frequency characteristic of the precompensation filter to be an inverse Sinc function; (5) obtaining a system function of the precompensation filter according to the amplitude-frequency characteristic and phase-frequency characteristic of the precompensation filter; (6) obtaining a unit impulse response function of the precompensation filter; (7) setting a threshold value, and setting the quantity in the unit impulse response function, which is smaller than the threshold value, to be zero to be as a coefficient of the precompensation filter; and (8) realizing the precompensaiton filter in a digital standalone of the satellite navigation signal generating system by using the coefficient of the precompensation filter, so as to compensate the group delay fluctuation of the satellite navigation signal generating system.

The invention relates to an anti-icing and deicing system used for a wind driven generator set. The anti-icing and deicing system used for the wind driven generator set comprises a freezing detectingunit, a controlling unit and an anti-icing and deicing unit, wherein the anti-icing and deicing unit is arranged at the roots of fan blades; the anti-icing and deicing unit comprises an axial walkingmechanism capable of moving in the length direction of the fan blades and a longitudinal telescoping mechanism arranged at the end part of the axial walking mechanism; the longitudinal telescoping mechanism comprises a manipulator; and a float type adsorbing contact is mounted at the front end of the manipulator, and a vibrator and a far infrared heater are arranged on the float type adsorbing contact. The invention further comprises an anti-icing and deicing method used for the wind driven generator set. According to the system, the anti-icing and deicing unit is arranged at the roots of thefan blades, accordingly the anti-icing and deicing unit moves from the roots of the blades to the anti-icing and deicing position when the anti-icing and deicing are needed and the anti-icing and deicing unit returns to the roots of the fan blades when not needed, so that the problem of the anti-icing and deicing of a fan can be solved, the weight of the fan blades is not increased, and the service life of equipment can be prolonged.

The invention discloses an axial flow fan stationary blade noise reduction structure based on a memory alloy. A memory alloy driver and trailing edge sawtooth sliding block mode is adopted, and the axial flow fan stationary blade noise reduction structure is restrained in an axial flow fan hollow stationary blade; and two groups of memory alloy drivers are fixed at the end of a slot channel on a machine box and a wheel hub. The trailing edge sawtooth sliding block is installed in the position, located on the side face of the trailing edge of the stationary blade, in the machine box and the wheel hub. A connecting rod of the trailing edge sawtooth sliding block is connected with the memory alloy drivers through a connecting loop. Under different rotating speeds, voltage is utilized to control the elongation amount of memory alloy wires, so that displacement of the trailing edge sawtooth sliding block is changed and is coincident with trailing tracing width, and wideband noise of the stationary blade trailing edge is reduced efficiently. Meanwhile, trailing tracing change of a low speed axial flow fan under the different rotating speeds is small, the adopted memory alloy driving way achieves control of millimeter level displacement, control precision is high, coincidence of the trailing edge sawtooth sliding block and the trailing tracing width is guaranteed, and the best effect of control is achieved.

The invention provides a rail transport vehicle power supply system comprising a follow-up power supply cart, a power taking mechanism mounted on a rail transport vehicle, an external power supply, and a controller. A power supply mechanism matching with the power taking mechanism is mounted on the follow-up power supply cart and connected with the external power supply to acquire power. The follow-up power supply cart reciprocates in a fixed range on a guide rail line of the rail transport vehicle. The power supply mechanism can be abutted to the power taking mechanism of the rail transport vehicle when the rail transport vehicle needs power, and can separate from the power taking mechanism after power supply, and the follow-up power supply cart can return its initial position after separation. The controller controls actions of the mechanisms. Therefore, normal power supply to the rail transport vehicle on a power-taking station segment of the rail transport vehicle is guaranteed.

The invention discloses a modulation method for inhibiting leakage current of H-bridge cascade inverters. The modulation method can maintain the sum of parasitic capacitance voltages of all modules to be constant, and thus the leakage current is eliminated. The method comprises the following steps: dividing all modules into module groups in pairs according to rules, and dividing into a power frequency module group and a high frequency module group; obtaining the on-off state of the power frequency module group through comparison of modulating waves and fixed values; obtaining the on-off state of the high frequency module group through comparison of corrected modulating waves and two stacked triangle carriers; and generating corresponding PWM signals through the combination of the on-off states, and distributing to corresponding pins. The scheme can be used for multiple H-bridge cascade inverters, and extra hardware cost does not need to be added, so that the leakage current flowing into a power grid can be eliminated, meanwhile the switching loss is relatively low, and the implementation manner is simple.

The invention discloses a cement head magnetic induction rubber plug indicator, which comprises a top cover, a cement head body and a lower joint. A detection section is arranged between the cement head body and the lower joint; the cement head body is provided with a spiral stop bin which stretches into the cement head body; a well cementing rubber plug which is limited by the spiral stop bin isarranged in the cement head body; a magnet is arranged on the well cementing rubber plug; and the detection section is provided with a magnetic sensor which is connected to a secondary instrument. The rubber plug is not in mechanical hard contact with a cement head when passing through the cement head, so the rubber plug cannot be damaged; and a magnetic field is taken as a medium, the magnetic induction sensor senses the downward movement of the rubber plug, and a detection signal is contactless and has high accuracy and reliability.

The invention relates to a separating alarming system for a safety helmet. The separating alarming system for the safety helmet is characterized in that pressure sensors are mounted at a front point, a rear point, a left point, a right point, a top reinforcement of the head and a mandible tying belt, wherein the four points arranged in a hoop of the helmet, corresponding to the head; each pressure-sensitive sensor sets the corresponding sensitive value for determining whether the safety helmet is worn accurately; a safety helmet alarming device is mounted at the outer part of a housing and transmits data with the sensors through a data wire; the safety helmet alarming device has the wireless signal emitting function and can be used for sending alarming information to an alarming terminal of a monitoring person in case that any pressure sensor does not sense the pressure from the head. According to the system, a plurality of pressure sensors are mounted, so that construction workers can wear the safety helmet accurately; the whole system is lightweight, the weight of the safety helmet is not increased, and a user does not feel any uncomfortable. With the adoption of the system, the states of lots of safety helmets can be recorded, so the monitoring person can comprehensively monitor all devices, and as a result, the safety construction management can be improved.

The invention relates to a stirring paddle. The stirring paddle comprises a stirring shaft, paddle blades and a connecting component. The paddle blades and the stirring shaft are connected in a welding manner. The connecting component is arranged at the top end of the stirring shaft. The stirring paddle is characterized in that at least two layers of paddle blades are arranged, each layer of paddle blades at least comprise three blades, and each blade comprises an upper inner rotational flow plate, a lower inner rotational flow plate and an outer rotational flow plate, wherein one end of the upper inner rotational flow plate and one end of the lower inner rotational flow plate are welded to the stirring shaft, and the other end of the upper inner rotational flow plate and the other end of the lower inner rotational flow plate are connected to the two ends of the outer rotational flow plate in a welding manner; and the upper inner rotational flow plates, the lower inner rotational flow plates and the outer rotational flow plates are obliquely arranged relative to the horizontal plane, the upper inner rotational flow plates and the lower inner rotational flow plates incline downwards in the rotation direction of the stirring shaft, and the outer rotational flow plates incline upwards in the rotation direction of the stirring shaft. According to the stirring paddle, the purpose of improving the stirring effect is achieved by changing the inner rotational flow plates and the outer rotational flow plates of the stirring paddle blades, and therefore the weight and the size of the structure cannot be increased, and labor wasting and other adverse effects cannot be generated on cement stirring work.

The invention discloses an inverse compensation stable-attitude quadrotor unmanned aerial vehicle. The inverse compensation stable-attitude quadrotor unmanned aerial vehicle comprises a vehicle body, wherein four arms are fixedly connected to the vehicle body, a rotor wing is installed at the tail end of each arm, the arms are arranged in a pairwise opposite mode, every two opposite arms are located on the same straight line, and the positions where two opposite arms are connected with the vehicle body are higher than the positions where the other two opposite arms are connected with the vehicle body; a chamber channel is formed in each arm, the chamber channels of every two opposite arms are communicated through a pipeline arranged in the vehicle body to form parallel channels, and balancing blocks are arranged in the parallel channels and driven by driving devices arranged on the parallel channels. By the adoption of the inverse compensation stable-attitude quadrotor unmanned aerial vehicle, the problem that the vehicle shakes under continuous strong wind high in the sky is effectively solved, and the quality of an aerial photo is more stable.

The invention discloses electronic equipment used for reducing the cost. The electronic equipment comprises an optical collecting unit and a processing unit. The optical collecting unit comprises a shooting subunit and an optical subunit, wherein the optical subunit is attached to the front end of the shooting subunit. The optical subunit at least has the scattering state. The processing unit is connected with a display unit and the shooting subunit. When the optical subunit is in the scattering state, the optical collecting unit collects environment optical information of the environment where the electronic equipment is located according to the shooting subunit and the optical subunit so that the processing unit can at least adjust a first value of a first display parameter of the display unit to a second value different from the first value according to the environment optical information. The invention further discloses a parameter adjusting method implemented through the electronic equipment.

The invention discloses a battery heat preservation device for an unmanned aerial vehicle. By laying a heat generation layer on a surface of a heat preservation material on a side surface of a box body and controlling power-on and power-off of the heat generation layer by a microcontroller, a temperature in the box body can be maintained within a set temperature range, a battery can normally supply power under a cold temperature, and the problems of flying time and safety of the unmanned aerial vehicle under a cold condition is solved; by arranging a heat preservation layer on an inner wall of the box body, the temperature of a heating layer is favorably and more efficiently stored in the box body for battery heat preservation; the heat generation layer is used for heating a graphene thin film through conduction, graphene has very excellent conductivity, and is very thin and light, and thus, the weight of a battery device cannot be increased by additionally arranging the graphene heating layer; and since power consumption quantity is extremely low, and the durability of the battery cannot be affected.