67results about How to "Achieve linear adjustment" patented technology

The device includes a radio frequency input module, down-conversion module, first loop of analog-digital composite feedback, second loop of digital feedback, feed forward loop, and base band processing module. The device possesses functions of sampling signals under high ratio of S / N by A / D converter module, extending range of variable gain amplifier, keeping power constant of multicarrier signal from receiver to output to base band under large signal dynamic range so as to meet requirement for power of each multicarrier signal by base band, root mean square detection adopted in power detection module to carry out linearization correction for non linearity of gain.

The present invention provides an auto electronic heating / ventilation air condition, including a generator, an electronic cooler / heater, a heat pipe, a water pump and a radiating tank. Kinetic energy generated by auto engine drives engine working, supplies electricity to auto electronic heating / ventilation air condition, and semiconductor refrigeration plate in the electronic cooler / heater cools or heats air in auto by circling water or antifreeze. This system need not refrigerant, has no pollution, small noise and lower efficiency, protects environment and saves energy.

The invention relates to a dynamic simulation experiment table for anti-lock braking systems based on magnetic powder clutch, while prior domestic enterprises has no production of automobile anti-lock braking system detection devices, and only sale the products of Japan, Canada and the like. Prior detection devices all adopt roller type and mount anti-lock braking systems on automobiles in test. The dynamic simulation experiment table comprises an energy transmission shaft (1) respectively connected with a flywheel (2), a torque sensor (3), a magnetic powder clutch (4) and a gear (5), and connected with wheels via a transmission flange (6), wherein the wheels are connected with a brake plate (7), and the energy transmission shaft (1) is connected with an iron table via a bearing (8) and abearing base (9). The dynamic simulation experiment table is applied in the performance detection of automobile anti-lock braking systems.

The invention discloses a valve-in-valve applied to the zero power of a turbine low pressure cylinder. The valve-in-valve comprises a first valve seat, a first valve element, a first driving component, a second valve seat, a second valve element and a second driving component. A first circulating hole is formed in the first valve seat, the first valve element is arranged on the first valve seat, and the first driving component is connected with the first valve element in a transmission mode and is used for driving the first valve element to move to make the first valve element open or close the first circulating hole. The second valve seat is arranged on the first valve element, a second circulating hole is formed in the second valve seat, the second valve element is arranged on the secondvalve seat, and the second driving component is connected with the second valve element in a transmission mode and used for driving the second valve element to make the second valve element to open or close the second circulating hole. The first circulating hole is used for carrying out linear mediation on circulation of maximum discharge, the second circulating hole is used for carrying out linear regulation on minimum discharge, and flexible switching of the maximum discharge and the minimum discharge is achieved through alternative opening of the first circulating hole and the second circulating hole.

The invention discloses a current linear control circuit for a constant current source. the circuit comprises a triode Q1, a first field effect transistor U1, a second field effect transistor U2, an operational amplifier U3, a first resistor R1, a second resistor R2 and a third resistor R3. The output end of the operational amplifier is connected with the grids of the two field effect transistors, and then the sources of the two field effect transistors are connected with the second input end of the operational amplifier. In this way, a closed-loop negative feedback is formed. Through adjusting the voltage of a third network node and applying a high level on a first network node, a second network node is enabled to output a current of a certain value. In this way, the current linear adjustment of the current source is realized. The current value is convenient to adjust and stable in adjustment process, while the sudden rapid change of the circuit is avoided. Through arranging the above two field effect transistors, the current is prevented from getting too large to damage electrical devices. The circuit is high in safety, stable in performance, simple in design, low in cost and wide in application range, so that the circuit can be widely applied to simple constant current sources.

The invention discloses portable fault indicator detection equipment, belonging to detection equipment. The portable fault indicator detection equipment comprises a UPS power supply, an ammeter, a singlechip, a touch screen and an internal control circuit, wherein the internal control circuit comprises a transformer T1, a transformer T2, a switch NO1, a switch NO3, a mutual inductor Q, an induction coil L and a current regulating branch; the current regulating branch circuit comprises a switch NO2, a current measuring range switching switch S2, an adjustable resistor R1 and a resistor R2; theammeter is connected with the UPS power supply; the switch NO3 and the transformer T2 are connected in series between a tested fault indicator and a power supply output end of the UPS power supply; and the singlechip is connected with the touch screen. By the adoption of the portable fault indicator detection equipment, voltage and current waveforms of various faults can be simulated, a pluralityof faults and anti-misoperation functions can be tested; the UPS power supply is provided so that a fault indicator test can be carried out in a field environment with power supply or power failure; and circuit faults are simulated in a state sequence mode of voltage and current to test whether the fault indicator can work normally or not, the fault indicator is guaranteed to be in a reset state after the test is finished, and a network can be hung in time.

The invention provides a carpet yarn twister, and relates to the field of textile machinery. The carpet yarn twister comprises a rack, a yarn frame device, an electric spindle device, an overfeeding device and a winding device, in the electric spindle device, a hollow spindle rod is fixedly connected with a motor, the motor drives the hollow spindle rod to rotate, and a twisting disc and a yarn storage disc are fixedly connected with the hollow spindle rod, and rotate with the hollow spindle rod; the yarn storage disc is provided with a yarn discharge hole communicated with a yarn channel inside the hollow spindle rod; a spindle jar used for accommodating an internal yarn winding package is connected with the hollow spindle rod through a spindle rod bearing, and the yarn jar is fixed. By means of the scheme that the motor directly drives a spindle, the scheme in the prior art of drive through a spindle tape is replaced, the spindle can obtain a higher rotation speed, the rotation speed is increased from 4,000-6,000 rpm currently to 7,000-1,0000 rpm, and the twisting efficiency of carpet yarn is improved.

The invention provides a current-constant driving light modulation circuit of an LED of a single-stage power supply. A power supply module and a power supply control module are connected with a primary coil of a transformer, the power supply control module is connected with an on-off control module and a PWM transmission module via a control module, the control module is also connected with the primary coil of the transformer, and the on-off control module is connected with the PWM transmission module via a signal conversion module; the control module receives a switch signal output by the on-off control module and then sends a control signal to the power supply control module, and receives a PWM signal output by the PWM transmission module and then sends a corresponding light modulation signal to the power control module; the signal conversion module converts the input voltage value into the corresponding PWM signal and outputs the PWM signal to the PWM transmission module; and the PWM transmission module amplifies the input PWM signal and transmits the amplified PWM signal to the control module. The circuit efficiency is improved, the light modulation cost is reduced, and energy is saved.

The invention relates to a solenoid type electromagnetic trip, which belongs to the technical field of the low-voltage apparatus. The solenoid type electromagnetic trip comprises a knob, an adjusting rod, a spring, a moving iron core, a static iron core, a coil, a concentrating flux plate and a magnetic yoke and is characterized in that a push rod pivotally arranged at the upper end part of the magnetic yoke is also included, wherein, one end of the spring is connected with the adjusting rod, the other end of the spring is connected with the push rod, and the upper end of the moving iron coreis movably connected with the push rod after penetrating the concentrating flux plate. The invention has the advantages that the linear regulation of the current setting value for the short circuit action is realized by adjusting the length of the spring through the knob; since the adjusting screw component is arranged on the magnetic yoke, the magnetic gap can be adjusted finely, the inconsistency of the current setting values of all the trips due to the parts and the assembly is eliminated, and the consistency of the initial states of all the trips is ensured; and at least one hanging hook is arranged on the upper edge of the push rod, so that the specification of the spring is reduced when the multi-gear adjustment is realized.

The invention relates to the technical field of flow valves and provides a micro-flow regulating valve, which is high in regulating accuracy and centralized in flow area and comprises a sleeve valve seat and a valve core arranged in the sleeve valve seat. A boss is arranged in a water outlet of the sleeve valve seat, the valve core head is tightly matched with the boss, and a fluid passing through groove with an overflowing area gradually decreased along the water inlet direction is arranged on one side of a valve core head portion. Further, the fluid passing through groove is a triangular groove. The valve core enables the whole flow area to be centralized in the groove from an original annular area and enables a local area to be increased and not to be blocked by small sundries. The overflowing area of the fluid passing through groove is gradually decreased along the water inlet direction so that linear regulating can be achieved. By means of design of the triangular groove, flow regulating can be controlled accurately, processing is easy, the diameter of the valve core can be larger than that of an existing valve core, and processing strength can be ensured.

The invention discloses a copper processing cooling water pressure automatic control device, comprising a cooling water inlet pipe, a cooling water outlet pipe and a cooling water storage tank, wherein the cooling water inlet pipe is communicated with the cooling water storage tank, the cooling water storage tank is internally provided with a liquid level adjusting piston and a water storage inputpipe, the water storage input pipe is located above a joint between the cooling water inlet pipe and the cooling water storage tank, the liquid level adjusting piston is located below the joint between the cooling water inlet pipe and the cooling water storage tank, the bottom of the liquid level adjusting piston is connected to a piston driving connecting rod, and the bottom of the piston driving connecting rod extends out of the cooling water storage tank and is in transmission connection with a lifting drive mechanism. The copper processing cold water pressure automatic control device canrealize the linear correlation adjustment of cooling water pressure, thereby ensuring the accurate adjustment of cooling water pressure, improving the stability of production quality of an upward continuous casting machine. A water pressure regulation system has a simplified structure.

The invention discloses a double-frequency adjustable Helmholtz silencing cavity of a vehicle engine. The double-frequency adjustable Helmholtz silencing cavity comprises a rotary sleeve mounted on the outer side of a hole penetration pipe in a sleeving mode and an outer pipe mounted on the outer side of the rotary sleeve in a sleeving mode and arranged eccentric to the rotary sleeve. An eccentricring cavity is formed between the rotary sleeve, the outer pipe, an outer pipe front end cover and a rear end cover. The middle portions of the hole penetration pipe and the rotary sleeve are provided with corresponding holes. The outer circumferential surface of the rotary sleeve is provided with two blade grooves. The blade grooves extend to the two ends of the rotary sleeve in the axial direction. An expansion blade is arranged in each blade groove. An included angle theta is formed between the two expansion blades. The eccentric ring cavity is divided into an acute-angle ring cavity and an obtuse-angle ring cavity through the two expansion blades. A volume adjusting device is connected with the rotary sleeve. According to the double-frequency adjustable Helmholtz silencing cavity, therotary sleeve is driven to rotate through the volume adjusting device to change the sizes of the acute-angle ring cavity and the obtuse-angle ring cavity so as to achieve the noise elimination frequency adjustability of a silencer. The double-frequency adjustable Helmholtz silencing cavity of the vehicle engine is simple in structure, quick in response and wide in covering working condition, andthe inertia of the volume adjusting structure is small.

The invention provides a power tester of a power source. The test comprises an electronic load module, an analog-to-digital conversion module, a microprocessor module, a serial port communication module and a switching power source module. A field effect transistor is combined with an operational amplifier to form a negative feedback circuit to further control a constant current, the current is adjusted linearly, the current stability is high, sudden and rapid change is avoided, the safety is improved, a microprocessor sets the current magnitude via a DA chip of 12-bit precision, reads the digital voltage value of an analog-to-digital conversion chip of the 12-bit precision and calculates the output power, a higher test precision is ensured, a host monitors a test result via a serial portremotely, convenience is provided for intelligent test, and the power tester is simple in structure, low in cost, flexible in use and especially suitable for testing the power of multiple power sources.

The invention discloses a cylinder cover capable of controlling the flow of an oil pump, which comprises an engine lubricating system oil passage and a cylinder cover rear-end oil way which are arranged in the cylinder cover, the tail end of the engine lubricating system oil passage is communicated with the cylinder cover rear-end oil way, the cylinder cover rear-end oil way is communicated with an oil pan, and an electromagnetic valve is arranged on the cylinder cover rear-end oil way. The electromagnetic valve is connected with the ECU; the electromagnetic valve changes the rotation angle to change the engine oil drainage amount according to an ECU instruction; the ECU linearly and dynamically adjusts the rotation angle of the electromagnetic valve according to the real-time working condition data of the engine. The flow-adjustable oil pump has the advantages of reducing fuel consumption, prolonging the service life of the oil, reducing the transmission noise of the oil pump and the like.

The disclosure describes a yarn twisting machine in which a hollow spindle rod is fixedly connected with a motor that drives the hollow spindle rod to rotate, a twisting disc and a yarn storage disc are fixedly connected with the hollow spindle rod and rotate along with the hollow spindle rod, the yarn storage disc is provided with yarn outlets, which communicate with inner yarn channels of the hollow spindle rod spindle tanks for accommodating inner yarn packages are connected with the hollow spindle rod through spindle rod bearings, and the spindle tanks are immobile.