759results about How to "Guarantee working reliability" patented technology

The invention provides a protection method of a modular multi-level current converter. The current converter comprises a sub-module controller and a sub-module; when the sub-module breaks down, the sub-module controller monitors and acts on the sub-module, so as to remove the failed sub-module timely, and the normal operation of the modular multi-level current converter can be ensured. According to the protection method provided by the invention, the overall current converter is not exited due to the fault of the sub-module, meanwhile, the sub-module is not integrally damaged due to the fault of the components in the sub-module, thereby greatly improving the utilization of the modular multi-level current converter and improving the stability of the system operation.

The invention relates to a high-speed turn-milling combined machining power electric main shaft device and a manufacturing method thereof. The main shaft device is arranged on a high-speed five-shaft turn-milling combined machining machine tool, and assorted electric, hydraulic and control parts are correspondingly combined with a system on the machine tool. The high-speed turn-milling combined machining power electric main shaft device is characterized in that the inside of a main shaft box is concentrically provided with a water jacket, an in-built motor and a main shaft from the outside to the inside; the inner bore of the main shaft is provided with a broach mechanism; the front end of the broach mechanism is provided with a broach case, and the rear end thereof is connected with a connecting sleeve and a broach detaching mechanism; a front bearing and a rear bearing which are arranged on the outer walls of both ends of the main shaft respectively form a bearing variable pre-tightening structure; a three-fluted disc mechanism is arranged on the periphery of the broach case; a broach oil cylinder is formed by a sleeve; an unloading oil cylinder, the broach detaching oil cylinder and a broach forging oil cylinder which are arranged at the rear end of the main shaft are arranged on the main shaft box through a rear end cover and a big flange; and an oil inlet and an oil outlet are respectively connected with the hydraulic system of the machine tool. The invention can realize the combined machining, such as high-rigidity lathe machining, high-rotating speed milling and the like.

The invention relates to a two-component sealing adhesive with low viscosity and high thermal conductivity and a preparation method thereof. The two-component sealing adhesive consists of a component A and a component B in a weight ratio of 100:80-100:125, wherein the component A comprises the following raw materials by weight percent: 40.00%-90.00% of thermal conductive powder, 4.50%-50.00% of low-viscosity liquid silicone oil, 0.50%-10.00% of silicane curing agent and 0.00-5.00% of toner; and the component B comprises the following raw materials by weight percent: 40.00%-90.00% of thermal conductive material, 9.50%-54.00% of low-viscosity liquid silicone oil, 0.04%-1.00% of catalyst and 0.00-5.00% of toner. The preparation method comprises the following steps: weighting all the raw materials according to the weight persentages to prepare the component A and the component B; and when in use, mixing the component A and the component B evenly in a weight ratio of 100:80-100:125, and curing to obtain the sealing adhesive of the invention.

The invention provides an intelligent gear-shifting top-spray shower head, belongs to the technical field of shower equipment and solves the problems that a conventional top-spray shower head cannot realize automatic gear shifting and is high in cost. The intelligent gear-shifting top-spray shower head comprises a housing with a water inlet formed in the upper side, wherein a plurality of groups of water outlet holes are formed in the bottom of the housing, and mutually independent water outlet cavities of which the number is equal to that of the groups of water outlet holes are formed in the housing; the water outlet cavities are communicated with the groups of water outlet holes in a one-to-one correspondence manner; a leading structure with both a water inlet end and a plurality of water outlet ends, a driving part capable of driving the leading structure, an inductor and a power supply unit capable of powering up the driving part are fixed in the housing; the water inlet end of the leading structure is communicated with the water inlet of the housing, the number of the water outlet ends is equal to that of the water outlet cavities, and the water outlet ends and the water outlet cavities are communicated in a one-to-one correspondence manner; the driving part can drive the leading structure to switch according to an induction signal of the inductor to be optionally communicated with one or more of the water outlet ends. The intelligent gear-shifting top-spray shower head has the advantages of being automatic in control, convenient to use, low in cost and the like.

The invention discloses an anti-drunk driving vehicle-mounted system capable of ensuring driver uniqueness. The vehicle-mounted system comprises an alcohol detector, an A / D converter and a starting controller; the alcohol detector is connected with the A / D converter; the vehicle-mounted system also comprises a face identification system, a CCD sensor circuit, an air valve and a central processor,wherein the face identification system is connected with the CCD sensor circuit and the central processor respectively; the central processor is connected with the A / D converter, the starting controller and the air valve respectively; the air valve comprises an air port; and the alcohol detector is arranged at the position close to the air port. The vehicle-mounted system uses an alcohol detection system as main detection and uses the face identification system as auxiliary monitoring, combines the two systems to monitor the driver in the whole course at the same time of avoiding drunk driving, can carry out uniqueness control for the driver, and is used for preventing the corrupt actions that the driver bribes others or stops the vehicle in the middle way to change others to drive the vehicle.

The invention relates to a vacuum belt press filter, comprising a rack, a vacuum filtration assembly, a press assembly and a filtration belt assembly, wherein the filtration belt assembly comprises an upper filtration belt, a lower filtration belt, and a cleaning device A and a cleaning device B which are used for respectively cleaning the upper filtration belt and the lower filtration belt; the cleaning device B comprises a front guide roller and a rear guide roller on the motion direction of the lower filtration belt, the front guide roller is arranged on the upper face the lower filtration belt, closely contacts the lower filtration belt and enables the lower filtration belt to form a V shape, the rear guide roller is arranged on the lower face of the lower filtration belt and is provided with a plurality of pinpricks, the size of each pinprick is matched with the size of a filtration pore of the filtration belt, and the rear guide roller contacts with the lower filtration belt by the pinpricks; and the cleaning device B is provided with a plurality of spray heads, and the spray heads are distributed on the upper face and the lower face of the lower filtration belt. The vacuum belt press filter of the invention has the advantage of favorable cleaning effect of the filtration belts, and belongs to the technical field of press machines.

The invention relates to a liquefaction system and a liquefaction method for NG (Natural Gas). The system comprises a cold box, a supply pipe for supplying the NG to the cold box, a No.1 refrigerant liquefaction subsystem, a No.2 refrigerant liquefaction subsystem, a No.1 refrigerant cooling subsystem, a No.2 refrigerant cooling subsystem, a heavy hydrocarbon separation tank which is used for conducting gas-liquid separation to liquid heavy hydrocarbon and gas light hydrocarbon, and an LNG (Liquefied Natural Gas) storage tank which is used for storing LNG obtained through liquefaction, wherein the cold box comprises an NG precooling passage which is connected with the heavy hydrocarbon separation tank and is used for supplying the NG; an NG deep cooling passage which is connected with the LNG storage tank and is used for supplying the gas light hydrocarbon; a No.1 refrigerant precooling passage and a No.2 refrigerant precooling passage which are used for respectively supplying and cooling high-pressure No.1 refrigerant and high-pressure No.2 refrigerant which are respectively supplied by the No.1 refrigerant liquefaction subsystem the No.2 refrigerant liquefaction subsystem, and are used for respectively supplying the cooled high-pressure No.1 refrigerant and the cooled high-pressure No.2 refrigerant to the No.1 refrigerant cooling subsystem and the No.2 refrigerant cooling subsystem; and a No.1 refrigerant cooling passage and a No.2 refrigerant cooling passage which are used for respectively supplying low-temperature No.1 refrigerant and low-temperature No.2 refrigerant which are respectively supplied by the No.1 refrigerant cooling subsystem and the No.2 refrigerant cooling subsystem to cool the NG, high-temperature No.1 refrigerant and high-temperature No.2 refrigerant. By adopting the technical scheme, the complexity and the energy consumption of the system can be reduced.

The invention discloses a pumping system and a distributing valve thereof, and concrete transporting machinery. The distributing valve of the pumping system comprises a first valve body plate, a second valve body and a rotatable valve plate, wherein the first valve body plate and the second valve body are respectively in sliding matching with two surfaces of the valve plate; the distributing valve has two states, in the first state, a first sucking hole is communicated with a material container through a first passing communicating hole, and a second discharging hole is communicated with a second pumping hole through a second passing communicating hole; and in the second state, a second sucking hole is communicated with the material container through a passing communicating hole, and a first discharging hole is communicated with a first pumping hole through the other passing communicating hole or the first passing communicating hole. The valve plate of the distributing valve does not need to rotate in a hopper, and the distributing valve does not need to be matched with an opening hopper for use; meanwhile, the state conversion of the distributing valve is realized through the rotary valve plate, a driving force required by the distributing valve during state conversion is greatly reduced, and the energy consumption of the distributing valve can be reduced.

The invention provides a hollow anode for a plasma thruster of a cusped magnetic field, and relates to a plasma thruster of a cusped magnetic field. By the hollow anode for the plasma thruster of the cusped magnetic field, the problems that a permanent magnet is demagnetized and the service life of a thrust is shortened due to the fact that an anode of the existing thruster of a cusped magnetic field is over hot are solved. The ionization rate of the thruster is increased, and the performance of the thruster is further improved. The hollow anode for the plasma thruster of the cusped magnetic field comprises a gas distributor, a buffering cavity and a ceramic sleeve, wherein a gas supply piece comprises a guide tube and a cavity; and the gas distributor comprises the gas supply piece and a distributor bottom plate. The hollow anode for the plasma thruster of the cusped magnetic field is used in the field of plasma thrusters of the cusped magnetic field.

The invention provides an air conditioner air supplying control method and a computer storage medium. The air conditioner air supplying control method comprises the steps that an air supplying commandof a user is obtained, and the swing directions of transverse swing blades and vertical swing blades are determined; a micropore slide plate is controlled to open, and the transverse swing blades andthe vertical swing blades act in the determined swing directions; the environment temperature of the space where an air conditioner is located is detected, the operation frequency of a compressor ofthe air conditioner is determined, and the compressor is driven to operate for the first preset time according to the determined operation frequency; and the operation frequency of the compressor is controlled to reduce, and after the operation frequency of the compressor is reduced for the second preset time, the micropore slide plate is controlled to close so that the air conditioner can supplyair through a plurality of micropores. According to the scheme, the situation that condensed water and even the frosting phenomenon occur due to too much cold energy generated inside can be avoided, the air supplying control method is more reasonable, the effect that supplied air is cool instead of being cold and is hot rather than being dry can be achieved in the micropore air supplying mode, andthe comfort degree of the user is greatly improved.

The invention discloses a vehicle and a hydraulic steering driving system. The disclosed hydraulic steering driving system comprises a centering oil cylinder, as well as a centering control single valve and first hydraulic control one-way valves, wherein a rod cavity and a rodless cavity of the centering oil cylinder are communicated with a free oil outlet of each first hydraulic control one-way valve; a middle cavity is communicated with a hydraulic oil tank; a free oil inlet of each first hydraulic control one-way valve is communicated with a working oil port; each control port is communicated with the other working oil port; and the centering control single valve has two states, so that the communication and the disconnection between the two working oil ports and the oil inlet and between the two working oil ports and an oil return port can be controlled. In the hydraulic steering driving system provided by the invention, the quantity of hydraulic control valves is small, so that the structures of an oil passage and a circuit can be further simplified, and the reliability of the hydraulic steering driving system is improved; and in addition, since the quantity of the hydraulic control valves is small, the coordination control on the hydraulic steering driving system also can be facilitated, and the reliability and the sensitivity are improved.

The invention discloses a heat radiation structure of a mobile terminal. The heat radiation structure comprises an installation bracket, wherein a mainboard heat radiation region and a camera shooting heat radiation region are arranged on the installation bracket in parallel, the mainboard heat radiation region is used for controlling temperature rise of a mainboard module, the camera shooting heat radiation region is used for controlling temperature rise of a camera module, the mainboard heat radiation region adjoins to one side of the mainboard module, the camera shooting heat radiation region is arranged on one side, away from the camera module, of the mainboard heat radiation region. According to the mobile terminal and the heat radiation structure thereof, the camera shooting heat radiation region used for controlling temperature rise of the camera module is arranged in a region outside the mainboard module and the camera module, so that the heat of the camera module is isolated from that of the mainboard module, and the heat of the mainboard module and the camera module is prevented from interactively affecting the heat radiation efficiency of the two modules even normal operation of the two modules, thereby ensuring heat radiation efficiency and stable operation of the mainboard module and the camera module simultaneously.

A refrigerator defrosting heater and a control method thereof are provided. The refrigerator defrosting heater is characterized in that a main heater and an auxiliary heater are arranged in group and controlled independently, the main heater is a defrosting heater for an evaporator, and the auxiliary heater is a defrosting heater consisting of a defrosting tray and a drainage pipe. The control method comprises: the main heater and the auxiliary heater are started synchronously to defrost when the defrosting operation is initiated; the main heater is stopped when the evaporator is defrosted completely, while the auxiliary heater continues working; the auxiliary heater is stopped when the defrosting tray and the drainage pipe are defrosted completely; and the whole defrosting process is ended. The invention is particularly suitable for the use in an air-cooling refrigerator and can efficiently prevent the drainage pipe from being blocked by ices and reduce the energy consumption.

The invention discloses an electronic detonator initiation system achieving communication through a repeater and a control method of the electronic detonator initiation system. The repeater and a coder are in wireless communication with a detonation controller, the repeater is in wired communication with an electronic detonator through a signal bus, and a power source is provided for the electronic detonator; meanwhile, wireless communication signals coming from the detonation controller and the coder are transferred to the electronic detonator in a wired communication signal manner, and feedback information, responding to various commands of the detonation controller and the coder, of the electronic detonator is returned to the detonation controller and the coder in a wireless communication signal manner; wireless transmitting-receiving units and the power sources of multiple electronic detonators are integrated to the repeater, the cost of signal electronic detonators is reduced, hardware circuits of the electronic detonators are simplified, and the working reliability of the electronic detonator initiation system is improved; and meanwhile, the friendliness to the detonation surrounding environment is improved, the signal transmission distance of detonation networks of the repeater is increased, and the coverage scope of detonation zones when one-time detonation operation is implemented is expanded.

The invention discloses an unmanned aerial vehicle surveying and mapping system for power transmission lines, including an unmanned aerial vehicle, on which a rangefinder, a camera, a wireless data module, a GPS module, a controller, a storage battery, a rangefinder, and a control port of a camera are installed. Connect the command output port of the controller, connect the data output port of the rangefinder, wireless data module, camera, and GPS module to the data receiving port of the controller, connect the data output port of the controller to the data receiving port of the wireless data module, and set the console There is a module corresponding to the wireless data module. There is also a digital magnetic field meter on the drone. The data output port of the digital magnetic field meter is connected to the data receiving port of the controller. The information is transmitted to the controller in digital form, and the controller controls the course and altitude of the UAV according to the strength of the magnetic field, so that the UAV can automatically patrol along the transmission line.

The invention relates to a testing device of a variable valve system and a testing method thereof. The testing device is characterized in that a valve mechanism driving system is arranged on a platform. A motor is connected with an oil pump, an inlet of the oil pump is connected with a sump, and an outlet of the oil pump is connected with an overflow valve, an energy accumulator and an oil inlet pipe of a solenoid valve in sequence. An overflow port of the overflow valve is communicated with the sump. A first outlet of the solenoid valve is communicated with a hydraulic piston cylinder arranged in a variable valve lifting mechanism, and a second outlet of the solenoid valve is communicated with the sump. The testing device can not only research the law of the impact of key structural parameters of the variable valve system on valve timing but also calibrate and optimize all structural parameters and perform cold running-in tests on key parts so as to ensure work reliability of the parts and provide a convenient and reliable testing platform for the variable valve system.

The invention relates to a convolutional neural network-based multispectral image semantic cutting method. The method comprises the following steps of: respectively and independently convoluting eachdata channel of a multispectral image by utilizing a convolutional neural network; and fusing feature maps obtained after independent convolution of the data channels. According to the method, a network with multi-resolution input and multichannel independent convolution is utilized, so that the problem that standard U-NET networks only can accept one same-scale RGB-Gray image is effectively solved, the working efficiency of multispectral image semantic cutting is effectively improved and the image cutting precision is ensured.

The invention relates to a flexible control loop of a hydraulic cylinder. The flexible control loop of the hydraulic cylinder comprises an oil inlet path (13), an oil return path (14), a first working oil path (15), a second working oil path (16) and a main oil path steering valve (1) for realizing flexible control over the hydraulic cylinder (4), wherein the first working oil path (15) and the second working oil path (16) are respectively connected to a rod cavity and a rodless cavity of the hydraulic cylinder (4); and a switching valve for controlling the first working path (15) to open and close is connected to the first working oil path (15). Besides, the invention also provides engineering mechanical equipment provided with the flexible control loop of the hydraulic cylinder. According to the flexible control loop of hydraulic cylinder and the engineering mechanical equipment disclosed by the invention, by arranging the switching valve on the first control oil path, the first control oil path is controlled to open and close as required, a stroke locking function for preventing a stretching member of the hydraulic cylinder from continuously extending due to accidental means is effectively realized, and therefore working reliability of the hydraulic cylinder is ensured.

The invention discloses a multifunctional cooking utensil. The multifunctional cooking utensil comprises an upper shell and a lower shell, an air inlet and an air outlet are formed in the upper shell;a air guide cover r is arranged below the upper shell; a cold air cavity is defined between the upper shell and the air guide cover; the air inlet and the air outlet are communicated with the cold air cavity; a motor and a cold air fan are arranged in the cold air cavity; the cold air fan is fixedly connected with a motor shaft of the motor; a hot air fan and a heating element are arranged belowthe air guide cover; a motor shaft penetrates through the air guide cover and then is fixedly connected with the hot air fan; a containing cavity is formed in the lower shell body, a container is arranged in the containing cavity, the multifunctional cooking utensil further comprises a steam generation device for providing steam for the container. The cold air cavity is hermetically separated fromthe containing cavity; and a steam exhaust channel is formed in the upper shell, a first communicating opening of the steam exhaust channel communicates with the containing cavity, a second communicating opening of the steam exhaust channel communicates with the outside, and the second communicating opening is located in the upper shell and is formed in the side different from the side provided with the air inlet.

The invention relates to a single-phase multifunction electric energy meter calibration stand automatic short circuit automatically connecting device, comprising a box body (1), a current wire connecting terminal component (2) and a voltage wire connecting terminal component (3); the front side of the box body (1) is fixedly connected with an assistant terminal needlebar component (5) which comprises an assistant terminal needlebar body (5.1), an assistant terminal probe (5.2), a circuit board (5.3) and a socket (5.4); the assistant terminal needlebar body (5.1) is fixedly connected with the front side of the box body (1), the assistant terminal probe (5.2) is vertically inserted in the assistant terminal needlebar body (5.1), the lower end of the assistant terminal probe (5.2) is connected with the circuit board (5.3), and the socket (5.4) is connected with the circuit board (5.3) and is arranged outside the box body (1). The invention can realize the automatic contact joint of the current, the voltage and the assistant wire connecting terminal in the whole electric energy meter testing process at one time, and the functional reliability is high when heavy current passes through. The device of the invention has the automatic wire connecting function, the automatic short circuit function and the socket attaching function.

The invention relates to a preparation method of a lateral insulating layer of a high-gradient zinc oxide voltage-sensitive valve plate, and belongs to the technical field of an electrical material. The method comprises the following steps: firstly, dispersing Bi2O3, Sb2O3, SiO2, Fe2O3 into mixing solution of polyvinyl alcohol water solution and ethanol to form even size; applying the obtained size at the side of a varistor valve plate billet, and firing to obtain a high-resistance layer in which Zn2SiO4 is taken as a main ingredient, Fe is dissolved and Zn7Sb2O12 is used as a secondary ingredient at the side of the zinc oxide varistor valve plate; evenly mixing the solution obtained by dissolving powder aluminium dihydrogen phosphate into normal-temperature water with SiO2 at normal temperature, and then evenly spraying the mixture at the side of the resistor plate and carrying out constant-temperature treatment, so as to obtain an inorganic glaze layer with high bonding strength; then drying the zinc oxide varistor plate, so as to obtain white and smooth lateral insulating layer at the side of the varistor plate. By adopting the preparation method, lateral insulation of a high-voltage gradient varistor plate with heavy shock current tolerance and high insulating strength can be obtained.

The invention relates to a protection circuit for preventing an LED from an impact. The protection circuit comprises a discharging capacitance and an LED load. Besides, the protection circuit is characterized in that: the protection circuit also comprises a field effect transistor, a first resistor, a second resistor, a first triode, a third resistor, and a fourth resistor; a resistance value of the second resistor is greater than or equal to a ratio of a threshold voltage of the first triode to a maximum breakdown current of the LED load; a drain electrode of the field effect transistor is connected with an output power supply cathode of an LED driver; one path of a source electrode of the field effect transistor is connected with a direct current power supply cathode of the LED driver through the second resistance; and the other path of the source electrode of the field effect transistor is connected with a base electrode of the first triode through the fourth resistance; an emitter electrode of the first triode is connected with the output power supply cathode of the LED driver; and one path of a grid of the field effect transistor is connected with a collector electrode of the first triode through the first resistance and the other path of the grid of the field effect transistor is connected with a direct current voltage through the third resistance. According to the invention, a low voltage field effect transistor is employed to carry out current limitation, so that a response speed of a whole circuit is fast and circuit power consumption is low; besides, an impact current from an LED driving power supply on a back stage LED load can be effectively inhibited as well as service life of the LED load can be prolonged.

The invention discloses an ultrasonic cleaning device for cables. The ultrasonic cleaning device comprises a cleaning rack and a cleaning box arranged on the cleaning rack. An ultrasonic generator used for driving cleaning liquid to vibrate is arranged on the cleaning rack and located below the cleaning tank. The cleaning tank comprises a main cleaning groove and auxiliary cleaning grooves located in the two sides of the main cleaning groove. The main cleaning groove is filled with the cleaning liquid and is internally provided with a circulation water inlet pipe. A plurality of water inlet holes are formed in the surface of the circulation water inlet pipe. At least one set of cable surrounding assembly used for enabling cables to rotate and move in the main cleaning groove is arranged in the auxiliary cleaning grooves. According to the scheme, due to the fact that the circulation water inlet pipe provided with the water inlet holes is arranged, flowing of the cleaning liquid is more gentle, the interference, caused on the frequency of vibration of ultrasonic waves, of liquid flow vibration is avoided, and the ultrasonic cleaning effect is effectively improved. According to the scheme, the cable surrounding assembly is installed in the auxiliary cleaning grooves and is prevented from being soaked in the cleaning liquid, and therefore the working reliability of the cable surrounding assembly is ensured.

The invention relates to a high-performance synthetic rubber asphalt waterproof coiled material with good high and low temperature resistance, high bonding strength, good air permeability, high surface tensile strength and capability of meeting the long-term water leakage-proof use requirement in a 'composite waterproof system'. The coiled material consists of an upper coverage layer, a lower coverage layer and a middle waterproof layer, wherein the upper coverage layer is made of polyethylene polypropylene fibers, a polyethylene film or a metal aluminum foil; the lower coverage layer is made of needled polyester non-woven fabric; and the middle waterproof layer is made of modified asphalt glue layer prepared from modified asphalt glue. The performance of the coiled material is improved by organically and comprehensively utilizing special functional materials, multiple macromolecules and inorganic materials, the waterproof performance of the coiled material is greatly improved, the cost of the coiled material is effectively reduced, the service life of the coiled material is reliably guaranteed, and the coiled material used with non-curing glue can make a substantial contribution to construction of a complete composite waterproof system, so the coiled material has obvious technical advancement and strong practicability.

In fluid machines frequently gaps between movable (1) and stationary (2) structural parts have be sealed off. Frequently so-called labyrinth packings are used, whereby sealing strips (5) brush against the opposite structural part. The aim of the invention is to provide an improved system. To this end, a brush layer (7) is configured as a porous coating that can be detached from the opposite structural part (1,2). The inventive system can be advantageously used in virtually any fluid machines.

The invention belongs to the electrical technical field and provides an inversion driving circuit for an IGBT (insulated gate bipolar transistor) induction heating power source. The inversion driving circuit for the induction heating power source comprises a pulse signal receiving and conditioning circuit (2), an isolating circuit (3) and a current amplifier (4). The pulse signal receiving and conditioning circuit (2) is communicated with an external circuit through optical fibers. The isolating circuit (3) is communicated with the pulse signal receiving and conditioning circuit (2). The current amplifier (4) is communicated with the isolating circuit (3). The inversion driving circuit further comprises an overvoltage protection and du / dt protection circuit (6), a transient suppression circuit (5) and an alarm output circuit (7). By means of the inversion driving circuit for the induction heating power source, quality of driving pulse signals is guaranteed while coupled signals returned from the direction of the IGBT are prevented from interfering operation of the driving circuit; and operational reliability of the IGBT is guaranteed while damage of IGBT devices can be effectively avoided.

This invention discloses a weld forging steel single-piece piston and its manufacturing method meeting the requirement of high power, high intensification and low discharge including: a piston body containing a piston ring welded to one unit with the piston by laser, an internal cool oil cavity set between them to connect with the internal cavity of the piston by at least two inlet and outlet holes and a bolt hole under the piston.

The invention belongs to the technical field of communication and navigation and in particular relates to a multi-frequency navigation terminal antenna. A top-layer feeding point is arranged at the center of a first-layer micro-strip patch; a central feeding hole is vertically formed in the top-layer feeding point; a first feeding point is arranged at a second-layer micro-strip patch; a first feeding hole is vertically formed in the first feeding point; a second feeding point is arranged at a third-layer micro-strip patch; a second feeding hole is vertically formed in the second feeding point; a third feeding point is arranged at a fourth-layer micro-strip patch. The antenna also comprises first short circuit metallized via holes and second short circuit metallized via holes which are used for eliminating coupling influence of feeding probes in all the feeding holes. The multi-frequency navigation terminal antenna disclosed by the invention can cover L band and S band of first-generation Beidou, B1 band and B3 band of second-generation Beidou and L1 band of a GPS (Global Positioning System); the demands on minimization and lightness of antenna size are met while good impedance bandwidth, axial ratio bandwidth and high-gain performance can be guaranteed.

The invention discloses a screen printing device for a storage battery packaging line. The screen printing device comprises a rack, a vertical sliding seat, a horizontal sliding seat, a screen printing mechanism and a stencil support, wherein columns are fixedly arranged on the rack, and the vertical sliding seat is vertically and slidably arranged on the columns and comprises a bottom plate slidably arranged on the columns, and a sliding seat body vertically and slidably arranged on the columns and positioned above the bottom plate; the bottom plate is connected with a first vertical regulating mechanism arranged on the rack, and the sliding seat body is connected with the bottom plate through a second vertical regulating mechanism; the horizontal sliding seat is horizontally and slidably arranged on the sliding seat body and is connected with a horizontal driving device arranged on the sliding seat body, and the screen printing mechanism is arranged on the horizontal sliding seat and can be used for screen-printing the upper surfaces of tiled storage batteries; the stencil support is fixedly arranged on the bottom plate, and a screen printing stencil is fixedly arranged on the stencil support and is positioned below the screen printing mechanism; the rack is matched with a clamping mechanism for clamping the storage batteries in a screen printing station. The screen printing device can facilitate the disassembly and cleaning of the screen printing stencil.