39results about How to "Stable working performance" patented technology

The invention discloses a high-voltage sealed DC contactor with auxiliary contacts. The contactor comprises a contactor casing and a shielding casing, a main static contact, a moving contact sheet and a transmission core rod are arranged in a sealed space formed by the contactor casing and the shielding casing, the moving contact sheet is vertically connected to the upper end portion of the transmission core rod, the upper end surface of the transmission core rod is provided with an auxiliary push rod, the shielding casing is provided with a circular hole at the position corresponding to the auxiliary push rod, and the upper end of the auxiliary push rod penetrates into the circular hole; and the shielding casing is provided with the upper and lower auxiliary contacts, and the auxiliary push rod can drive the lower auxiliary contact to connect with or disconnect from the upper auxiliary contact when moving up and down with the transmission core rod. According to the high-voltage sealed DC contactor with the auxiliary contacts, the auxiliary push rod is arranged at the upper end surface of the transmission core rod, and the upper and lower auxiliary contacts are arranged on the shielding casing, so that the occupation space is very small, it is not required to omit arc extinguishing magnetic steel, and the working performance of the contactor is more stable.

The invention belongs to the technical field of civil engineering and relates to a displacement enlarging friction damper and the assembly construction process. The displacement enlarging friction damper comprises a lower connecting plate, a lower friction piece, a main plate, an upper rear friction piece, an upper front friction piece, a rear steel angle, a front steel angle, lower racks, triple gears, dual connecting rods, upper racks, U-shaped connecting pieces, a high-strength bolt, a limiting bolt, a gear rotary shaft and a positioning pin. The main plate is located between the lower connecting plate and the front steel angle and the rear steel angle which are arranged in a separated mode. The lower friction piece is adhered to the upper surface of the lower connecting plate. The two friction pieces are adhered to the lower surface of the rear steel angle and the lower surface of the front steel angle correspondingly. The triple gears, the upper racks, the lower racks and the dual connecting rods are located between the rear steel angle and the front steel angle. The lower racks are welded to the upper surface of the main plate, and the upper racks are welded to the lower surfaces of the dual connecting rods. The U-shaped connecting pieces are welded to the ends of the dual connecting rods. The sliding friction displacement of the damper is enlarged by the displacement enlarging friction damper through the gear transmission theory, and the energy consumption capacity is high.

The invention discloses a wet type multi-disc brake integrating functions of speed lowering, braking and parking. The wet type multi-disc brake which is mainly applicable to the harsh-condition and inconvenient-to-maintain brake systems of various machines is characterized in that parts are mounted by using a shell as a base, the brake is fixed by the connection of a stud and an axle, and a drive wheel is connected with a hub through a connecting bolt to synchronously rotate with car wheels; each friction plate working cavity is a sealed cavity which can effectively deal with external harsh work conditions, circulation cooling oil is fed into the sealed cavity, temperature rise can be lowered effectively, consumption is reduced, stable work performance is achieved, slight abrasion is achieved, and adjustment is generally not needed during use; each friction plate is annular and large in working area, the multi-disc structure is used, and large brake torque can be obtained under small gasket pressure; the brake torque can be adjusted by changing the number of friction pairs, and friction pair standardization can be achieved easily; good radiating and cooling effect, low working temperature and long service life are achieved, and the service life of the wet type multi-disc brake is generally 3-5 times of that of a dry type brake.

The invention discloses a coal field fire area wireless sensor monitoring node. The coal field fire area wireless sensor monitoring node comprises a wireless microprocessor, a power supply circuit, an external clock, a watchdog member, LED (light-emitting diode) lamp sets, an RS232 (recommend standard 232) serial port, a voltage measuring circuit and a high temperature acquisition circuit. The designed peripheral circuits correspond to monitoring requirements respectively, the functions are specific, and redundant components are omitted. The LED lamp sets are connected with a power supply and the wireless microprocessor through a jumper, the jumper is turned on during debugging, and the jumper is turned off during using, so that energy consumption can be reduced. All circuits and chips are integrated into a circuit board, components are firmly connected, and the working performance is stable. The coal field fire area wireless sensor monitoring node is applicable to coal field fire area monitoring to collect the temperature, ambient temperature and humidity, battery voltage of an underground coal seam in a fire area. The coal field fire area wireless sensor monitoring node has functions of synchronous dormant, watchdog, power protection, brownout detection and the like, and is low in power consumption and long in service life.

The invention discloses a moving contact component and a startup relay. The moving contact component comprises a moving iron core, a locating rod, an insulated jacket sleeved on the locating rod and a moving contact piece and a buffer spring sleeved on the insulated jacket, wherein the moving contact piece and the buffer spring are arranged in turn in a direction far away from the moving iron core; the insulated jacket is provided with a sliding area; and the moving contact piece can move to and fro within the sliding area under the action of outside force and the restore elastic force of the buffer spring. The startup relay comprises a shell, a coil component, a moving contact component of the structure, a fixed contact component and a restore spring providing the restore elastic force for the moving contact component. The moving contact piece and two fixed contact pieces can be closed in the process that the moving contact piece moves along with the moving iron core. The moving contact component and the startup relay have the advantages that the moving contact piece is directly arranged on the moving iron core, so that the overall structure is integrated and the installation and the maintenance is convenient; and the buffer spring effectively reduces abrasion caused by collision when the moving contact piece and the fixed contact pieces are closed, and ensures the service life of the moving contact piece.

The invention discloses a yarn tension constant device which mainly comprises a roller, a mandrel, a magnetic sleeve, a magnetic-lag sleeve, a sleeve base, an adjusting disc, an annular locking cover and a yarn guiding hook. A cylinder support which coincides with the axis of a roller inner cavity is fixedly arranged on the roller inner cavity. The mandrel is arranged in the cylinder support. The magnetic sleeve or the magnetic-lag sleeve is fixedly arranged on the back side surface of the mandrel in a sleeved mode. The magnetic sleeve or the magnetic-lag sleeve is fixed in the sleeve base which is arranged in the cylinder support in a rotating mode and enables the magnetic sleeve and the magnetic-lag sleeve to form partial sleeve connecting. An air gap is reserved between the two surfaces of the sleeve-connecting part. The adjusting disc is connected to the back face of the sleeve base in an inserting mode. The annular locking cover is arranged at an edge opening of the cylinder support in a rotating mode and abuts against the adjusting disc. The yarn guiding hook is arranged at the front end of the mandrel. According to the yarn tension constant device, torsion on the yarn guiding hook is generated by the corresponding magnetic sleeve and the corresponding magnetic-lag sleeve, the torsion is constant and can be adjusted accurately, and the roller can carry out storing and paying off on yarn properly according to the magnitude of tension of the yarn. The yarn tension constant device can guarantee the fact that yarn tension on forming cheese yarn is complete the same.

The invention discloses a contact backstop of logarithmic spiral profile wedge blocks, which is used for overcoming the defects of the conventional eccentric circular curved profile wedge block contact backstop. The backstop comprises an outer ring, an inner ring, a retainer, wedge blocks, supporting rollers, restoring springs, check rings, end covers, an anti-rotating pin and backstopping arms. The logarithmic spiral profile wedge blocks are adopted in the contact backstop, and the included angle between the pole diameter of any points on the logarithmic spiral and the tangential direction of the point is a fixed value, so that the working wedge angles between the wedge blocks of the profile and the inner and outer rings of the backstop are fixed values in the backstopping process, the contact pressure and the contact stress of the backstop are not changed due to changes of contact points, and the backstop can be stable in contact and reliable in backstopping. The backstop has the advantages of low contact stress, low abrasion, long service life, stability and reliability in backstopping, good backstopping effect, simplicity in reverse separation, convenience in disassembly and assembly and the like, and is easy to maintain.

The invention relates to an automatic conveying device for an oil pipe rod applied to workover treatment. The automatic conveying device consists of 2-4 groups of pipe bridges which are arranged in parallel; the end parts of the pipe bridges are together connected with a lifting mechanism; each pipe bridge consists of four layers of isolating pipes; the end part of each isolating pipe of at least two groups of pipe bridges is provided with a motor; each isolating pipe is connected with a push-picking device through a slide way; a connecting plate provided with a lug boss is arranged above the corresponding push-picking device and is connected with the corresponding motor through a transmission device; the two ends of each connecting plate are each provided with a pipe picking retaining pin extending out upwards; each pipe picking retaining pin is limited to rotate only towards the direction of the lug boss of the corresponding connecting plate by virtue of an elastic device; the end part, in the moving direction, of each push-picking device is provided with a pipe pushing retaining pin which is capable of rotating up and down. By adopting mechanical automatic oil pipe rod discharging equipment, the automatic conveying device provided by the invention is high in efficiency, high in quality and capable of alleviating the labor intensity.

The invention discloses a roadbed hydraulic power generation device which comprises a roadbed energy collection device, a generator, an inverter and a storage battery. The roadbed energy collection device converts pressure kinetic energy generated in a process that a vehicle grinds a roadbed into potential energy and stores the potential energy. The generator converts kinetic energy output by the roadbed energy collection device into electric energy and outputs the electric energy, and the electric energy output by the generator is converted through the inverter to charge the storage battery. The roadbed energy collection device is mainly formed by a hydraulic pipe and a plurality of hydraulic gaskets sequentially arranged on the roadbed. The roadbed hydraulic power generation device has the advantages of being capable of adopting to the application conditions of repeated vehicle grinding and complex ground environment, simple in structure, stable in working performance and low in manufacture and maintaining cost.

The invention discloses a parameter configuration method, device and system for a multi-channel high-speed analog-to-digital conversion chip. The method comprises the following steps: inputting a preset signal to a multi-channel high-speed analog-to-digital conversion chip; acquiring signal output results of a plurality of channels of the multi-channel high-speed analog-to-digital conversion chipat different time delay values, and determining an optimal time delay value according to the signal output results; and under the optimal time delay value, determining a direct current bias parameter,an amplitude adjustment parameter and a phase delay parameter of each channel according to the signal output result of each channel. The technical problem that in the prior art, the efficiency of manually adjusting the parameters of the multi-channel high-speed analog-to-digital conversion chip is low is solved.

A lightening induction damped oscillation wave generator for onboard equipment comprises a continuous adjustable voltage source, a potentiometer, a change-over switch and a relay; the continuous adjustable voltage source is a 10kV continuous adjustable voltage source; the potentiometer W adjusts the on / off time of an internal circuit to change the size of direct current output voltage for adjusting the output voltage of the voltage source; the change-over switch is a five-port change-over switch; the circuit is enabled to work at one state every time due to the switching of the change-over switch K and five outputs are realized. The circuit is simple in structural design and stable in work performance, all output circuits are not mutually interfered with, the output signal has high precision, the operation is convenient, the measurement precision is high, the voltage withstanding level is high and the work is safe and reliable; the lightening induction damped oscillation wave generator for the onboard equipment is widely used for the test on the lightning transient voltage endurance capacity.

The invention relates to a method of real-time detection, by using camera mobile phone, which comprises: mobile photo uses camera to preview the detected field, set the trigger mode of camera, stores the scanned first image data and stores the scanned next image data, to be compared; and the mobile photo will camera when the trigger condition is met. The invention can realize real-time detection via mobile photo, to photo shadiness and store useful information in limit memory. And the mobile photo is portable which can be arranged anywhere. The invention avoids addition elements, with high sensitivity and stable operation.

The invention relates to an air pressure ejection instant starting device, which comprises a launching tube. One end of the launching tube is provided with an end cover, and the other end of the launching tube is provided with a locating sleeve; a launching rod is coaxially arranged in the launching tube; a piston is positioned on a rod segment, which is arranged in the launching tube, of the launching rod; a pressure storage cavity is enclosed by the end surface facing the end cover of the piston, the side wall of the launching tube and the end cover; a normal pressure cavity is enclosed by the end surface facing the locating sleeve of the piston, the side wall of the launching tube and the locating sleeve; a counter hole is axially formed in the end surface, which faces the end cover, of the launching rod; the hole position of the counter hole is provided with a baffle cover; the baffler cover is fixed on the launching rod; a screw rod is arranged in the axial direction of the launching rod and extended into the counter hole; a nut is arranged in the counter hole and screwed on the screw rod; the screw rod is in transmission connection with a power output end of a speed reducer; and the location sleeve is provided with a launching rod locking device used for locking the launching rod. The air pressure ejection instant starting device is rapid in starting, stable in working performance and large in working stroke, and has long service life.

The invention provides a zero leakage inserting installation one-way valve which comprises a valve element, a valve seat, a spring, a compression nut, sealing rings and stopping rings. A guiding shaft of the valve element is arranged in the valve seat, one end of the spring is arranged on a location shaft of the valve element in a sleeved mode, the other end of the spring is arranged in a location hole of the compression nut in a sleeved mode, the compression nut is connected with the valve seat, the first stopping ring and the first sealing ring are arranged in a sealing groove of the compression nut to be sealed, the second stopping ring and the second sealing ring are arranged in a sealing groove of the valve seat, a V-type groove structure is formed between the valve element and the valve seat, and an O-type sealing ring is arranged in a V-type groove. According to the zero leakage inserting installation one-way valve, a sealing structure mode that the V-type groove is combined with the O-type sealing ring is adopted, the reverse sealing performance is good, and the zero leakage requirement can be met. Meanwhile, the zero leakage inserting installation one-way valve has the advantages of being low in manufacturing cost, reliable in working performance, high in reliability, small in size, light in weight, compact in structure, convenient to operate, easy to disassemble and assemble and the like, and the zero leakage inserting installation one-way valve is suitable for systems with compact space structures.

The invention discloses a mouse wheel and a mouse wheel assembly thereof. The mouse wheel assembly comprises the mouse wheel and a photocoupling pair transistor. The mouse wheel comprises a rolling-ball position-clamping mechanism, an outer wheel and a grate rolling shaft. The grate rolling shaft comprises a rolling shaft and multiple grates which are distributed by taking the rolling shaft as thecenter along the circumferential direction and are arranged on the rolling shaft. The grates are made of non-transparent material. The outer wheel is arranged on the outer surface of the grates in asleeving manner. Position-clamping grooves are uniformly distributed in the inner surface of the outer wheel. The rolling-ball position-clamping mechanism is provided with a movable rolling ball. Therolling ball matches the position-clamping grooves to movably clamp positions. The photocoupling pair transistor comprises an infrared pulse transmitting tube and an infrared impulse receiving tube, both of which are arranged on two sides of each grate. During rolling of the mouse wheel, emitting light clusters of the photocoupling pair transistor can be cut off in an alternating manner. A mouse can fulfill the functions of turning over pages, rolling and zooming. The service lifetime of the mouse is prolonged. The mouse wheel is high in function precision, more stable in working performance,more uniform and comfortable in rolling feel and great in rolling sense and can be suitable for different environments.

A coil winder for fishing with double side covers, including main body, swing arm unit, transmission unit, mandrel, coiling unit, and two side covers, said main body has a local crural part connected to fishing pole, a body part formed with primary axis, a fitting hole lying in the body part with its two sides open, said two side covers are made of non-metallic material, distributing on both sides of the body part to close fitting holes, one side cover forms a holding space with the body part, said transmission unit is installed in the said holing space and has a glide block, said mandrel penetrates the main body and connects with the glide block, said coiling unit pin points the front end of the body part, said swing arm unit connects with the transmission unit, making use of the transmission unit to drive the mandrel to move to-and-fro offset according the primary axis, making the coiling unit revolve. The invention could induce the overall weight, without impact the strength of structure, making the working capability stable to come to the aim of both light quantization and high intensity, making disassemble and assemble department easy and the coil winder works well at the same time.-{}-th

The invention discloses an infrared induction faucet based on smart metal. The infrared induction faucet comprises a faucet body. The faucet body is provided with an infrared sensor and a valve for blocking or unblocking a water pipe. The infrared sensor and the valve are connected with a power supply module through a wire. The valve is a smart metal valve and made of a shape memory alloy. A heating element is arranged on the faucet body. The infrared sensor is coupled to the heating element. The heating element is coupled to the smart metal valve. The smart metal valve is in the state of blocking the water pipe under the normal temperature and is changed to the state of unblocking the water pipe when heated. A solenoid valve for a traditional infrared induction faucet is replaced with the smart metal valve for the infrared induction faucet, and the service life of the infrared induction faucet is prolonged.

The invention provides a pyroelectric infrared automatic hand drier. A circuit of the pyroelectric infrared automatic hand drier is provided with an infrared induction control circuit; the infrared induction control circuit is constructed by use of a human body pyroelectric infrared sensor SD02 module and a time-base circuit NE555 chip; the human body pyroelectric infrared sensor is used for inducing hands so as to control the output state of the NE555 chip; the output of the NE555 chip is utilized to control actuation and release of a control relay K so as to control the start and stop of operation of a PTC heater and a fan motor M. Compared with a hand drier adopting a conventional infrared induction circuit, the pyroelectric infrared automatic hand drier is capable of directly inducing pyroelectricity infrared rays of a human body, dispenses with an infrared emission device and an infrared receiving device, is free from obstruction of obstacles and influence of other light rays, and is stable in working performance; furthermore, the hand drier provided by the invention is less in used electric elements, simple in control circuit, low in failure rate and worthy of popularization.

The invention discloses a hydraulic diaphragm metering pump with a diaphragm protection function. The hydraulic diaphragm metering pump comprises a pump head, wherein a liquid inlet port, a liquid outlet port, a medium channel, a connection hole and a medium cavity are formed in the pump head; the liquid inlet port, the liquid outlet port, the medium channel, the connection hole and the medium cavity are communicated and form a T-shaped cavity; a diaphragm protection assembly is further arranged on the pump head; and the diaphragm protection assembly is internally arranged in the pump head andthe components of the diaphragm protection assembly are connected together. The pump head of the hydraulic diaphragm metering pump with the diaphragm protection function is remarkably improved in sealing performance compared with a pump head in the prior art. The diaphragm protection assembly is simple in structure, the components of the diaphragm protection assembly are integrally connected, andan integer can still be kept in any state; and in this way, the position relationship and the connection relationship among the components of the diaphragm protection assembly are quite stable, and then the whole diaphragm protection assembly is stable in working performance.

The invention discloses a universal ingot grinding machine. The ingot grinding machine comprises a frame, a two-wheel shaft and a grinding device. The frame is placed on the two-wheel axle shaft and a handle is arranged on the frame. The grinding device is arranged on the frame. The grinding device comprises a turbine, a driving shaft, a grinding wheel, an anti-dust cover, a belt and a switch. The turbine is connected with the driving shaft through the belt. The grinding wheel is installed on the driving shaft and extends to the out portion of the edge of the frame. The turbine is located at the front end of the frame. The driving shaft is installed on the frame and is located at the rear end of the frame. The switch is arranged on the handle. The universal ingot grinding machine has the advantages of being simple in structure, stable in working performance, capable of reducing labor intensity, capable of reducing manual work and capable of eliminating most potential safety hazards. The universal ingot grinding machine is not affected by factors of the size and the appearance of materials, sites and the like. The universal ingot grinding machine is large in application range.

The invention discloses a dual-coil magneto-rheological valve with damping gap being automatically adjusted in the liquid flow direction. The dual-coil magneto-rheological valve is mainly composed oflimiting bolts, end covers, reset springs, a valve body, a valve core, valve core pistons, field coils, a winding frame and the like. The gap between the winding frame and the valve body forms a conical liquid flow channel, and a plurality of sections of damping gaps are formed in the conical liquid flow channel under the action of electric currents in the field coils. Magneto-rheological liquid pushes the left valve core piston to drive the valve core to move rightwards when flowing from an A opening to a B opening, the damping gaps in the conical liquid flow channel are decreased, and the valve inlet-outlet pressure drop is increased; and the magneto-rheological liquid pushes the right valve core piston to drive the valve core to move leftwards when flowing from the B opening to the A opening, the damping gaps in the conical liquid flow channel are increased, and the valve inlet-outlet pressure drop is decreased. Under the condition that the magnitude of field currents is not changed, the dual-coil magneto-rheological valve can achieve the effect that the valve inlet-outlet pressure drop is automatically changed along with changing of the flowing direction of the magneto-rheological liquid, and the dual-coil magneto-rheological valve is especially suitable for a valve-controlled cylinder system requiring small circuit pressure.

The invention relates to the field of heading machinery and provides a resistance increasing body and a heading machine which aim at solving the problems that an existing heading device is not suitable for construction of stratums such as sand, cobble and hard rock, and the service range is limited. The resistance increasing body comprises an annular support frame and a plurality of resistance increasing mechanisms circumferentially distributed along the support frame. Each resistance increasing mechanism comprises a first driving device fixedly connected to the support frame and a friction piece slidably matched with the support frame. The first driving devices are in transmission connection with the friction pieces and arranged to be used for driving the friction pieces to extend out to the outer side of the outer annular surface of the support frame or draw back to the inner side of the outer annular surface. Each resistance increasing mechanism further comprises a second driving device fixedly connected to the corresponding friction piece and a shearing piece which is in transmission connection with the corresponding second driving device, and the shearing pieces are arranged to be capable of extending out to the outer sides of the outer surfaces of the friction pieces or drawing back to the inner sides of the outer surfaces of the friction pieces under driving of the second driving devices. The resistance increasing body and the heading machine have the beneficial effects that the various stratums such as clay, the sand, the cobble and the hard rock can be simultaneously adapted, and the adaption range is wide.

The invention provides a hydrogen-rich foot bath. The hydrogen-rich foot bath comprises a hydrogen production device. Hydrogen, with its unique properties, has many advantages in biology, and one of the more obvious features is its strong penetrability, therefore hydrogen can easily enter the cells of oxygen free radicals such as the nucleus and mitochondria and in combination with any part of human body. The hydrogen producing device is fixed on the foot bath body through a positioning hole, thereby ensuring the working performance of the hydrogen producing device to be more stable. The hydrogen-rich foot bath has the effect of biological treatment and physical treatment.

The invention belongs to the technical field of bamboo chip detection. The technical problem solved by the invention is: the existing bamboo edge defect detection device is prone to false alarms and cannot be applied to production lines. The technical solution of the present invention is: a device for detecting edge defects of bamboo slices, comprising legs, front baffles, back baffles, bracket ears, detection levers, detection rollers, winding wheels, bamboo slices and wire sensors. The beneficial effect of the invention is that the external interference factors are less, and the working performance is more stable.

The invention discloses a novel corner crimping machine comprising a left corner crimping sliding plate, a left piercing-riveting shaft, a left corner crimping tool, a right corner crimping sliding plate, a right piercing-riveting shaft and a right corner crimping tool, wherein the left piercing-riveting shaft is arranged on the left corner crimping sliding plate; the left corner crimping tool is arranged on the left piercing-riveting shaft; the right piercing-riveting shaft is arranged on the right corner crimping sliding plate; the right corner crimping tool is arranged on the right piercing-riveting shaft; and the left corner crimping sliding plate and the right corner crimping sliding plate are respectively connected with an air-sac-type power unit by which the left corner crimping sliding plate is driven to be close to or separated from the right corner crimping sliding plate. According to the novel corner crimping machine, the air-sac-type power unit is arranged to drive the corner crimping tools to realize 90-DEG connection of aluminum doors and windows; the air-sac-type power unit has the various advantages of zero friction during working, no maintenance need and stable working performance; the actions of the corner crimping tools are driven by the air-sac-type power unit instead of an oil cylinder / an air cylinder, so that the stability of each corner crimping tool in working and the workpiece machining quality are ensured.

The invention discloses a cutting-off device for building waste battens. The cutting-off device comprises a worktable and a rack; a drive motor with a driving belt wheel is arranged on the rack, a cammechanism, a punching device and a punching platform are arranged on the worktable from front to back, a vacuum pump is arranged at the position, behind the punching platform, of the worktable, and an air gun is connected to the vacuum pump. The device has the beneficial effects that the device is simple in structure, work performance is stable, through the stable rotation cam mechanism, the battens can be stably punched, according to the punching device, according to the actual condition of the battens, different tool bits are replaced, through a bearing punching base with an inclined opening and a movable base with the clamping function, the battens have the certain buffer effect when being cut off, it is ensured that the battens cannot be thrown away everywhere after being cut off, thevacuum pump and the air gun on the worktable can effectively clean wood bits and dust generated during punching, and all sliding deices can stably run.

The invention discloses a method for manufacturing a metamaterial panel. The method comprises a step of stirring and mixing thermoset synthetic resin liquid and hollow glass beads to form a needed sizing agent, wherein the total mass of the hollow glass beads accounts for 1%-7% of the mass of the sizing agent, a step of respectively and fully immersing an amount of fiber cloth into the sizing agent to obtain a plurality of prepregs, and a step of heating and pressurizing the prepregs to be pressed into an integrity to obtain the metamaterial panel. The invention further discloses a metamaterial antenna cover manufactured through the adoption of the method for manufacturing the metamaterial panel. The metamaterial panel is simple in manufactured technique, low in cost, high in mechanical strength and good in wave-transparent property, and the wave-transparent property of the antenna cover is further enhanced by the manner that man-made micro structures are arranged on the metamaterial panel periodically.

The invention discloses a square wave signal source. The square wave signal source is characterized by comprising a 9V direct-current power supply, a mono-stable and oscillation frequency regulating circuit, wherein the model of a time-based circuit IC1 of the mono-stable and oscillation frequency regulating circuit is NE555. According to the embodiment of the invention, the square wave signal source manufactured by utilizing a multi-vibrator circuit is used for measuring circuit-isolated technical indexes and related circuit. The square wave signal source disclosed by the invention can meet the measurement requirements of common circuit board technical indexes in signal waveform requirement, signal output amplitude (peak-peak value P-P), signal distortion, harmonic wave and the like. The square wave signal source is an electronic apparatus which is simple in circuit structure, stable in working performance, low in price and good to use. All circuits of the square wave signal source are manufactured by common apparatus, so that the manufacturing cost is only dozens of Yuan, and the square wave signal source is suitable for large-scale development of a plant.

The invention discloses a hybrid hydraulic steel plate coiling mechanism. The hybrid hydraulic steel plate coiling mechanism comprises a bottom support, a bottom bracket, an upper bracket, a cantilever rack, a cantilever closing cover, a pressing roller support frame, a pressing wheel, an end sliding part, a first occlusion mechanism and a second occlusion mechanism, wherein the upper bracket is mounted on the bottom support; the upper bracket is capable of moving up and down; the left end of the cantilever rack is sleeved with the upper bracket; the cantilever rack is capable of rotating relative to the upper bracket; the cantilever closing cover is arranged on the cantilever rack, and the cantilever closing cover is capable of moving along the cantilever rack; the pressing wheel is mounted under an extension arm of the cantilever rack through the pressing wheel bracket; the end sliding part is mounted in a connection box of the cantilever closing cover; the occlusion mechanisms comprise hydraulic pushing rods, occlusion wheel support frames, occlusion wheels and occlusion wheel shafts; the first occlusion mechanism is mounted on the end sliding part; the second occlusion mechanism is inversely mounted at a bottom support II; the occlusion wheels of the two occlusion mechanisms are in occlusion with each other. According to the hybrid hydraulic steel plate coiling mechanism, the production process is relatively stable, automatic and universal.

The invention particularly relates to a demonstrator capable of delaying 30 seconds. The demonstrator comprises a time-base circuit, a relay, a resistor, a capacitor, a diode, a key, a socket and a lamp holder, the resistors comprise a resistor R1 and a resistor R2; the capacitor comprises a capacitor C1, a capacitor C2 and a capacitor C3; a key SB, the negative electrode of the circuit is groundGND; the positive electrode of the circuit is VCC, one end of the key SB is connected with a positive electrode VCC; the other end is connected with the time-base circuit, the relay and the positive electrode VCC in sequence; the time base circuit is an NE555 integrated block; after resistors R1 and R2 are connected in series, one end of each resistor R1 and R2 is connected with pins 2 and 6 of the time-base circuit together with anodes of a capacitor C1 and a capacitor C2, the other end of each resistor R1 and R2 and cathodes of the capacitor C1 and the capacitor C2 are connected with the ground GND together, and pins 4 and 8 of the time-base circuit NE555 are connected with a circuit VCC. The demonstration instrument is simple in circuit, low in cost, stable in working performance, convenient to operate and use, high in demonstration light brightness, visual and good in teaching effect, and has certain use market and popularization value.