467results about How to "Solve fever problem" patented technology

The invention belongs to agricultural seeding machinery, and in particular relates to a permanent-magnet magnetic-attraction precision seeding device. A semi-open type seed box is arranged on the side of a roller; the roller is fixedly connected with a transmission shaft and follows the transmission shaft to rotate in the single direction; the upper edge of the wall of the roller is uniformly provided with a plurality of through holes in the circumferential direction; a permanent-magnet magnetic attraction head, a magnetic-attraction-head jacket, a magnetic-attraction-head cover plate and a pressure spring are arranged in each through hole; one end of the permanent-magnet magnetic attraction head is arranged in the magnetic-attraction-head jacket, and the other end of the permanent-magnet magnetic attraction head passes through a center hole of the magnetic-attraction-head cover plate but does not exceed the upper surface of the magnetic-attraction-head cover plate; the pressure spring is positioned between the magnetic-attraction-head jacket and the cover plate; a cylindrical cam is hollowly sleeved on the transmission shaft and is fixed; the outline of the cylindrical cam consists of a circular arc surface and a platform surface; and the platform surface is partially arranged on the lower part of the cam. The seeding device has the advantages of improving the magnetic attractive force of the magnetic attraction head, reducing the content of iron powder needed by magnetic-powder coatings of seeds, reducing the structure size of seeding elements and conveniently realizing the automatic seed-taking function and automatic seeding function of the magnetic attraction head.

The embodiment of the invention provides a battery voltage-multiplying charging circuit and a mobile terminal. The charging circuit comprises a charging port, a high-voltage charging unit, a low-voltage charging unit, a battery pack and a system. The battery pack includes a main battery and at least one extra battery; the high-voltage charging unit and the low-voltage charging unit are connected with the charging port, and the low-voltage charging unit is connected with the system and the battery pack; the high-voltage charging unit is connected with the battery pack; when quick charging is performed, the main battery and each extra battery are switched to be a series connection state, the charging voltage is transmitted to the high-voltage charging unit and the low-voltage charging unit through the charging port, the main battery and each extra battery are charged by the high-voltage charging unit, and the system is charged by the low-voltage charging unit; and when the charging is completed, the main battery and each extra battery are switched to be a parallel connection state and configured to charge the system. The battery voltage-multiplying charging circuit provided by the embodiment of the invention is able to avoid the problem that the battery body is heating and too high in temperature in the charging process.

The embodiment of the invention relates to the technical field of electronics. A charging device and a mobile terminal establish a communication connection in advance; when the verification of device identification of the charging device is passed, the mobile terminal sends battery information to the charging device via the communication connection; and the charging device determines charging parameters for the charging of the mobile terminal according to the battery information so that the mobile terminal is charged according to the charging parameters. According to the charging method and the charging device, when the mobile terminal and the specific charging device are charged, a charging management chip is shielded, the current and voltage for the charging of the mobile terminal can be controlled via the charging device, the problem of the heating of the charging management chip of the mobile terminal in the charging process can be solved, and the charging efficiency of the mobile terminal is improved.

The invention discloses a multifunctional electrical characteristic testing device and a multifunctional electrical characteristic testing method for a high-voltage circuit breaker. The testing device consists of a dynamic resistance detection module, a non-synchronism detection module, a displacement sensor, Hall current sensors, a data acquisition card, an industrial control computer and an industrial display screen, wherein a super capacitor is used as a power supply for the detection of loop resistance, and impact current with a peak value of 1,000A is used as detection current. The testing device is a multifunctional testing instrument integrating the detection of loop resistance, closing resistance, closing resistance running time and mechanical characteristics of the high-voltage circuit breaker.

The invention relates to the cell equalization system technology field and especially relates to a cell equalization system based on bidirectional DC / DC. The cell equalization system comprises a cell module, a cell management unit and a power supply bus. The cell management unit comprises a single chip microcomputer, a bidirectional DC / DC module, a bidirectional polarity switch and a driving / interlocking circuit. An input terminal of the bidirectional DC / DC module is connected with the power supply bus. An output terminal of the bidirectional DC / DC module is connected with the input terminal of the bidirectional polarity switch. A charging / discharging equalization control terminal of the single chip microcomputer is connected with a control terminal of the bidirectional DC / DC module. A polarity switch control terminal of the single chip microcomputer is connected with the control terminal of the bidirectional polarity switch. The single chip microcomputer controls a bidirectional switch array through the driving / interlocking circuit. According to the invention, through using the single chip microcomputer to control the bidirectional DC / DC module, the bidirectional polarity switch and the bidirectional switch array, time sharing charging and discharging equalization of each cell in the cell module can be realized.

The invention discloses a charging control method and device. Then method includes the following steps: acquiring initial charging voltage and initial charging current of a battery to be charged; and if the fact that the initial charging voltage is larger than a set voltage threshold and the initial charging current is larger than a set current threshold is determined, controlling a charge pump conversion circuit to be powered up and a step-down conversion circuit to be powered down, controlling an adapter to output dynamic voltage and dynamic current to the charge pump conversion circuit, and charging the battery to be charged through the charge pump conversion circuit. Compared with the prior art, since the efficiency charge pump conversion circuit is adopted during large-current charging, step-down conversion efficiency is effectively improved, charging speed is increased and charging time is shortened; and in addition, since the charge pump conversion circuit does not contain an inductance device which is easy to generate thermal energy, the problem of heat emission of a circuit during charging can be further solved.

The invention discloses an active and passive compound control system for a hybrid power hydraulic excavator. According to the active and passive compound control system for the hybrid power hydraulic excavator, a control circuit comprises a hydraulic pump A, a hydraulic pump B, a hydraulic pump C, a movable arm cylinder control valve bank, a bucket rod cylinder control valve bank, a bucket control valve, a rotation control valve, a rotating motor control valve bank, a two-position and two-way valve I, a two-position and two-way valve II, a two-position and two-way valve III, a two-position and two-way valve IV, a two-position and two-way valve V, a two-position and two-way valve VI, a two-position and two-way valve VII, a two-position and three-way valve I, a two-position and three-way valve II, an energy accumulator I and an energy accumulator II, an open type control circuit is adopted to serve as the control circuit, the two cavities of a hydraulic cylinder are each controlled through a power source, and the pressure and the flow of each cavity are regulated independently. The active and passive compound control system for the hybrid power hydraulic excavator has the multiple technical advantages that the energy efficiency is high, the degree of integration is high, power consumption is low, power supply redundancy is avoided, a pilot oil source is not needed, the noise is low, and kinetic energy recovery and potential energy recovery are integrated.

The invention relates to a charging method, mobile equipment, charging equipment and a charging system. The mobile equipment comprises a battery and a connector. The connector comprises a charging pin and a land pin. When the charging pin is connected with an output pin of the charging equipment through a charging cable or by seat charging, the charging pin receives a first current signal transmitted through the output pin of the charging equipment and transmits the first current signal to a positive pole pin of the battery, and therefore the battery is charged.

The invention relates to a direct current convertible frequency air conditioner and a control method thereof. The direct current convertible frequency air conditioner comprises a power supply inverter module (IPM), and is characterized in that: the pulse width modulation (PWM) control signal of the power supply inverter module comprises more than two types of carrier frequencies, and the carrier frequencies correspond to the working mode of the direct current convertible frequency air conditioner. During operation, the method for operating the direct current convertible frequency air conditioner comprises the following steps of: 1, determining a corresponding carrier frequency in advance according to different working modes for running the direct current convertible frequency air conditioner; 2, calculating corresponding control parameters of a compressor according to the carrier frequency which is determined after selecting the working mode; 3, storing the control parameters of the compressor in corresponding positions of an outdoor storage; and 4, starting the air conditioner by a user to determine the different working modes for running the direct current convertible frequency air conditioner. The invention not only can solve the problem of heating of the power supply inverter module which runs at a high frequency in a high-temperature environment, but also solves the problem of instability of the frequency conversion compressor which runs at an ultrahigh frequency in a heating mode, so the comfort of the convertible frequency air conditioner is greatly improved.

The invention relates to a magnetic nozzle of a variable specific impulse magnetic plasma rocket, aiming at solving the problem of speed waste during acceleration of a plasma body in an electric propulsion system and relating to the design technology of the magnetic nozzle of the variable specific impulse magnetic plasma rocket. The magnetic nozzle of the variable specific impulse magnetic plasma rocket is used for changing a circumferential speed of the plasma body to an axial speed and belongs to the magnetic fluid technology field. The magnetic nozzle which is used as the last stage of the variable specific impulse magnetic plasma rocket is arranged at the tail end of a rocket engine and consists of a sprayer nozzle and a superconducting coil, wherein, the sprayer nozzle is arranged at the tail end of a shell body of the rocket engine and is an expanding nozzle, the nozzle expansion ratio which is the ratio between a nozzle exit area and a nozzle throat area is 40:1, the nozzle is made of a heat-resisting and ablation-resisting alloy material to reduce ablation and thrust eccentricity.

The invention relates to a disc-type permanent magnetic coupling mechanism and devices using the same, including a disc-type permanent magnetic coupling speed regulator, a magnetic coupling speed regulation device running at constant power and a brushless doubly-fed coupling transmission device using the same. The mechanism comprises a permanent magnetic rotor and a conductor rotor, the conductor rotor comprises a conductor disc with a groove and a lead wire, induction current in the conductor disc flows in a set direction, and the current is guided to other device outside the conductor disc via the lead wire, so that the current is controlled or utilized. The current or current of the conductor rotor is controlled by a control unit, so that the disc-type permanent magnetic coupling speed regulator regulates the magnitude of the output torque to meet the requirement for rotating speed, and realizes a speed regulation function. The magnetic coupling speed regulation device running at constant power realizes constant power speed regulation operation. The brushless doubly-fed coupling transmission device reduces the radial size and the axial size and saves the installation space of equipment by combining a disc-type structure and an axial structure.

The invention provides a display substrate driving device and method and a display device. The display substrate driving device comprises a feedback module and a processing module, wherein the feedback module is used for generating feedback voltage based on fluctuation amplitude of voltage of public electrode signals when the voltage of the public electrode signals in the display substrate fluctuates, the processing module is used for superposing the feedback voltage and the gamma reference voltage to generate a first gamma voltage, the first gamma voltage is used for generating and driving gray scale voltage of a pixel electrode of the display substrate, and the difference between the gray scale voltage and the fluctuated voltage of the public electrode signals meets the condition that luminance information displayed by pixels is kept constant. Accordingly, by adjusting the voltage of the pixel electrode, coupling fluctuation of the public electrode signals can be effectively and uniformly compensated and suppressed, image display quality of the display device is guaranteed, and the problem of heating of a compensation circuit can be effectively solved.

The present invention provides a charging control circuit which can compensate the charging for battery with lower voltage in series battery set during charging and enables the terminal voltage of independent battery in series battery set to tend to uniform. The charging control circuit can detect the terminal voltage of the independent battery in series battery set in real time during charging and compensate charging for the battery with lower terminal voltages through a compensation charging circuit, thereby making up the differences of the initial state and the charging / discharging characteristics for independent battery in the battery set, unleashing the loading capability of the independent battery while making sure the independent battery has no over-charging and improving charging and discharging efficacy of the power battery.

The invention provides a method employing a cloud server to carry out remote electric appliance control. A cloud server remote electric appliance control system comprises a cloud end and an equipment control terminal, wherein the cloud end can be used for storing the controlled equipment information acquired by the equipment control terminal and emitting corresponding instructions, and the equipment control terminal comprises a multi-functional equipment controller based on an ARM. The system can provide an effective electricity saving scheme for a user.

The invention discloses a giant magnetostictive ultrasonic transducer which comprises a rear cover plate, a magnetism conduction block, a permanent magnet, a giant magnetostictive rod and an amplitudevariable rod, wherein the components are connected by using bolts; a pre-tightening force is provided by the bolts; a magnetism conduction sleeve, a magnetism conduction piece and the amplitude variable rod are fixed by using a screw and a stem; holes are formed in the middles of both the bolts and the amplitude variable rod; a groove is formed in the magnetism conduction piece; certain gaps areformed between a rear cover plate and the magnetism conduction sleeve, and between the giant magnetostictive telescopic rod and a coil. When a transducer is cooled by using a coolant, a hose is connected between the bolt and a central hole of the stem. By adopting the giant magnetostictive ultrasonic transducer, the transducer can be cooled by using a cooling gas or the coolant, a cooling water tube or a cooling water jacket can be also arranged between the coil and the giant magnetostictive telescopic rod to cool the transducer, the problem of heating of the transducer can be effectively solved while the transducer is rotated at a high speed, temperatures of the transducer can be controlled to fluctuate within a very small range, and the transducer can work stably.

The invention relates to an overvoltage protection method and an overvoltage protection device of a current transformer. The overvoltage protection method comprises the following steps of: acquiring a current signal on the secondary side of the current transformer; converting the acquired current signal into a voltage signal, comparing the voltage signal with the preset protective value and judging whether the secondary side of the current transformer is an open circuit or not; when the converted voltage signal is more than the preset protective value, short-circuiting the secondary loop of the current transformer; and when the converted voltage signal is not more than the preset protective value, recovering the normal connection state of the current transformer. The overvoltage protection device comprises an acquisition unit, a main control unit, a voltage-limiting protection circuit and an open circuit protection action component, wherein the output terminal of the open circuit protection action component is connected between the output terminals of the current transformer. The method and the device adopt a intelligent mode to control, adopt a mechanical switch to finish open circuit protection and avoid the influence of heating of the electronic device on the whole circuit in the prior art.

The invention belongs to the technical field of the thermomagnetic measurement of magnetic materials, and relates to a magnetic material curie temperature measuring method based on thermogravimetry changes. Through measuring the changing relationship between balance apparent weight and temperature under the effect of a low field intensity applied magnetic field, the curie temperature of a magnetic substance is obtained. The suction effect of an electromagnet to the magnetic substance is related to magnetic field intensity and also relies on the gradient changes of the magnetic field intensity, therefore the obvious thermogravimetry changes can be obtained under a non-uniform field intensity applied magnetic field with relatively lower field intensity, and the changes can be easily measured by a high-precision analytical balance. According to the magnetic material curie temperature measuring method based on the thermogravimetry changes, the obvious thermogravimetry changes can be obtained by using the non-uniform field intensity applied magnetic field with the relatively lower field intensity, and then the curie temperature of the magnetic substance can be measured; the problem of coil heating caused by the fact that a high-intensity magnetic field needs to be loaded when materials with weaker magnetism are measured by using a magnetic-thermo curve method is avoided; the method is economical and convenient, and is easy to popularize.

The invention discloses a giant magnetostictive ultrasonic spindle which comprises a stem, wherein a secondary winding is fixed by the stem through a screw a; electric energy is conducted to the secondary winding from a primary winding; a bearing is arranged between the secondary winding and the primary winding; a positioning pin is arranged on the primary winding; a positioning block is insertedinto the positioning pin; the positioning block is connected with an ultrasonic wave generator through a lead; the center of a giant magnetostictive telescopic rod is hollowed, is subjected to axial slicing treatment and is further stuck by using an epoxy resin; in addition, a stripy hole is communicated with a through hole c; the lead is wound on the giant magnetostictive telescopic rod; direct current is overlapped in an excitation coil to provide an offset magnetic field; a rear cover plate, the giant magnetostictive telescopic rod and an amplitude variable rod are fastened through pre-tightening bolts; the stem is connected with the amplitude variable rod through a screw b; the amplitude variable rod is connected with a tool head through an elastic clamp; a gap is formed between the stem and the rear cover plate. By adopting the giant magnetostictive ultrasonic spindle, the problem that a giant magnetostictive ultrasonic transducer radiates heat in practical processing can be effectively solved.

The invention discloses a machine tool rotating unit and a casing part high-precision rotary printing electrolytic machining machine tool. The machine tool rotating unit comprises a rotating conductive ring, a core shaft, a hollow main shaft, a torque motor and a main shaft seat; a rotating conductive ring stator is connected with the main shaft seat, a conductive ring rotor is connected with thecore shaft, the core shaft is fixedly connected with the hollow main shaft through an insulation supporting sleeve in an insulation mode, the hollow main shaft is responsible for clamping of a workpiece, and the core shaft is responsible for electrode electricity leading; a torque motor stator is connected with the main shaft seat through a shaft sleeve, a motor rotor is directly connected with the hollow main shaft, a cooling channel is designed in the rotating unit, and the cooling channel can also be used as a liquid supply channel for electrolytic machining so as to realize the internal liquid supply of a tool cathode. Compared with the design of an existing electrolytic machining machine tool that the transmission mode of connecting the servo motor and a speed reducer with the main shaft is adopted and the main shaft is responsible for force bearing and electricity leading, the machine tool has the characteristics that the transmission precision is high, allowable machining current is large, the advantages of high-efficiency machining of electrolytic machining are brought into full play, and the application range of rotary printing electrolytic machining is expanded.

The invention discloses a star-shaped impeller charged lithium battery crusher. The star-shaped impeller charged lithium battery crusher comprises an upper insulation material bin; the lower part of the insulation material bin is connected with a vacuum feeding chamber; the lower part of the vacuum feeding chamber is provided with a crushing chamber; the lower part of the crushing chamber is provided with a vacuum discharging chamber; the lower part of the vacuum discharging chamber is provided with a vertical material outlet; the vacuum feeding chamber and the vacuum discharging chamber are connected with a vacuum pump through vacuumizing pipes; the crushing chamber is filled with a protective gas; before introduction of materials into the crushing chamber, the vacuum feeding chamber is used for vacuumizing of lithium batteries to be crushed, it is ensured that there is no oxygen in the crushing chamber, the crushing chamber is filled with the protective gas, so that discharging of the lithium batteries in crushing is prevented, and a heating problem in lithium battery crushing process is solved.

The invention discloses a giant magnetostriction rotary ultrasonic vibration device comprising a knife handle, a primary winding, and two sets of bearing systems. A secondary winding is arranged on the knife handle, and the primary winding and the secondary winding are connected through inductive coupling; a giant magnetostriction transducer is installed at the lower part of the knife handle; thegiant magnetostriction transducer is sleeved with the two sets of bearing systems; and the bottoms of two sets of bearing systems are opposite and the two sets of bearing systems are connected by screw threads. An air cooling system is adopted to cool the giant magnetostriction transducer, and the problem of heat generation of the giant magnetostriction transducer in actual processing can be effectively solved; copper stranded wires are adopted by driving coils, compared with commonly used copper wires, the copper stranded wires are more conducive to heat dissipation, and the operating temperature of the coils is reduced; a thin-walled sleeve inside a transducer shell and a flange are arranged to ensure the coaxiality of the flange and the transducer shell, and the giant magnetostriction rod is subjected to uniform pre-tightening force; and the sleeve is arranged to facilitate the outward diffusion of heat generated by the giant magnetostriction rod and the coils.

The invention relates to a hybrid power engineering machine multi-actuator control system which comprises a double-pump double-loop hydraulic control system. A backpressure adjusting unit, a first conversion control valve, a second conversion control valve, a third conversion control valve, a fourth conversion control valve, a fifth conversion control valve, a sixth conversion control valve and a hydraulic control one-way valve set. According to the hybrid power engineering machine multi-actuator control system, a hybrid power system is additionally arranged, recycling of movable arm potential energy and rotation braking kinetic energy is achieved, integrated control over energy recycling and load difference throttling loss eliminating is achieved, shortcomings in the prior art are effectively eliminated, and the beneficial effects of high energy efficiency, low emission and the like are achieved.

The invention relates to a dynamic sealing device having a cooling function for a high-power and high-speed submerged motor, which comprises a stator [1] and a rotating shaft [10]. A shaft sleeve [8] is fixed on the rotating shaft [10]; a sealing seat [3] is sealed with the shaft sleeve [8]; a sealing gland [5] presses a reinforced seal [6] in a recess of the sealing seat [3]; a seal ring III [9] is arranged between the shaft sleeve [8] and the rotating shaft [10]; the shaft sleeve [8] has a self-circulation cooling structure; the shaft sleeve [8] is provided with a cooling water inlet [12] and a cooling water outlet [13]; a blade [14] is vertically arranged in the shaft sleeve [8]; the sealing seat [3] is fixed on an end cap [11]; and the end cap [11] is fixed on the stator [1]. The device has high sealing performance by combining a shaft seal with the reinforced seal; and the self-circulation cooling structure of the shaft sleeve solves the problem that the shaft sleeve and a bearing have a high temperature due to the high speed revolution of the submerged motor, so that the safe, reliable and long-term operation of the submerged motor are ensured.

The invention belongs to the technical field of batteries, and especially relates to a probe. The probe comprises a probe base, a first spring, a current probe rod, a voltage probe, a second spring, a current probe, an expansion head, and a probe end cover. The first spring and the probe seat are sequentially disposed on the current probe rod in a sleeving manner. The current probe rod is provided with a hollow cavity. One end of the voltage probe passes through the hollow cavity to extend out of the current probe rod. An end part of the current probe rod is provided with an accommodation part, and the accommodation part comprises an accommodation part body, an accommodation hole, and an accommodation groove, wherein the accommodation hole and the accommodation groove are disposed on the accommodation part body. The second spring is disposed in the accommodation hole, and the current probe and the expansion head are cooperatively connected, and are inserted into the second spring. The other ends of the current probe and the voltage probe are respectively provided with a sharp tooth part. The probe cover covers the accommodation groove. The arrangement of the above structure enables the probe to solve a problem of the connection of an electrode lug and a power supply during the formation and capacity grading of large-capacity power batteries.

The invention provides a high-power LED two-dimension light source, wherein an aluminum-base printed circuit board is directly welded or adhered with a high-power LED chip, the chip welded area is processed with a bowl-shape concave which circumference is furnished and plated with silver to form a light reflective area, the chip is arranged with a light reflective bowl with silver plated at inner surface to be fixed on the aluminum-base circuit board, a chip light outlet is packed with silicon-type transparent resin, in curvature shape, the light reflective bowl is covered with a lens unit, arranged with an electric connecting structure. The invention can be used to produce mono product or multiple beamed product, with standard distance connecting port, surface light source with low cost and high integration, better heat radiation, and uniform lighting effect, which can be used as general semi-conductor lighting source of variable lamps.

The invention discloses a contact finger pressure test instrument of a high-voltage isolation switch. The contact finger pressure test instrument comprises a mould which is matched with a contact of the high-voltage isolation switch in the aspect of shape during the normal use, a contact type pressure sensor, an acquisition and amplification circuit, a singlechip and a display, wherein the contact type pressure sensor is detachably embedded in the mould and one end is exposed out of the mould; a signal output end of the contact type pressure sensor is connected with a signal input end of the acquisition and amplification circuit through an RS 232 data line; a signal output end of the acquisition and amplification circuit is connected with a signal input end of an A / D (Analog / Digital) conversion circuit in the singlechip; a signal output end of the A / D conversion circuit in the singlechip is connected with a signal input end of a processor in the singlechip; and a signal output end of the processor in the singlechip is connected with the display. According to the contact finger pressure test instrument, the contact finger pressure of the high-voltage isolation switch can be tested, so that the contact heating problem of the high-voltage isolation switch due to insufficient contact finger pressure of the high-voltage isolation switch can be solved in advance; and the contact finger pressure test instrument has the advantages of convenience in test, high accuracy and visualized display.

The invention relates to the field of battery managing systems, and discloses an all-day real-time initiative energy equalization method. The device adopting the method is composed of a battery voltage detecting circuit, an equalization switch, an equalization resistor, a battery set and a central processing unit. The central processing unit can be communicated with the voltage detecting circuit. The voltage detecting circuit is connected with the equalization switch, and the equalization switch is connected with the equalization resistor and the battery set. When the central processing unit detects that the voltage difference between the voltage of a certain battery and the voltage of one battery with the lowest voltage among all batteries reaches a certain value and the voltage of the battery is higher than equalization starting voltage, the equalization circuit of the battery is closed, and redundant electric quantity of the battery is released through the equalization resistor; when the voltage difference between the voltage of the battery and the voltage of the battery with the lowest voltage is smaller than the equalization shutting voltage difference, the equalization circuit of the battery is opened, and equalization is stopped. By means of the method, the battery set is equalized, heat dissipation is low, the equalizing effect is good, the circuit is simple and reliable, and the method has wide applied prospects.

The invention relates to an automatic circulation heat dissipation type linear motor motion control platform and a control method thereof. The automatic circulation heat dissipation type linear motormotion control platform comprises an upper computer, a lower computer controller and an automatic circulation heat dissipation device, the lower computer controller comprises a temperature control board card, and the upper computer communicates with the lower computer controller through an RS232 serial port line; the temperature control board card sends a control signal to an electric control valve in the automatic circulation heat dissipation device; a motor temperature sensor is installed in an area with the most obvious temperature heating of the motor rotor of the permanent magnet synchronous linear motor; the automatic circulation heat dissipation device comprises a cooling plate, the cooling plate is assembled on the upper side of the coil winding of the motor rotor in a surface-mounted mode, a cooling pipe is laid on the cooling plate, a cooling liquid inlet is connected with an external cooling liquid supply loop through an electric control valve, and a valve position sensor isarranged on the valve rod of the electric control valve; and the motor temperature sensor and the electric control valve are connected with the temperature control card. The platform solves the heating problem of the motor in different motion states, and the motion precision of the motor is improved.

The embodiment of the invention discloses a cooling device for a VR glasses-based hand-held terminal, the hand-held terminal and VR glasses, and aims at effectively solving the heating problem and reducing the influence of heating to a user. The cooling device for the VR glasses-based hand-held terminal comprises a fan (2) and an air guide groove (3), wherein the fan (2) is accommodated into a shell (1); the fan (2) is arranged at one side of a heating element; one end of the air guide groove (3) is opposite to the fan; the other end is opposite to a plurality of vent holes (4) formed in the shell (1); the air guide groove (3) has a rectangular corrugated concave and convex structure; and a recess forms the air guide groove.

The invention discloses a transmission type laser beam shaping system, which comprises a transmission type phase modulation mirror, a spatial filter and a transmission type collimator, wherein an incident surface of the transmission type phase modulation mirror consists of concave and convex spaced concentric toroidal surfaces with different heights, the adjacent convex surfaces and concave surfaces correspond to adjacent peaks of a laser beam, and an emergent surface of the laser is a concave surface; the spatial filter is used for selecting modes of an output beam of the transmission type phase modulation mirror, so that the central main peak beam of the output beam can pass through, and secondary small peaks are reflected and absorbed; and the transmission type collimator is used for compressing a divergence angle of the selected main peak beam, so as to obtain single-mode laser with small divergence angle and low energy loss. The transmission type laser beam shaping system provided by the invention has the advantages of simple structure and convenient adjustment, is high in power of the fundamental mode of the obtained beam, and can be applied to a variety of laser processing processes such as laser cutting, welding and punching.