45results about How to "Stable pressure relief" patented technology

The invention discloses a quick hydraulic control device of a hydraulic injection molding machine. A control signal of a servo driver is connected with a driver; the driver is connected with a servo motor; the servo motor drives an oil pump to run; an inlet of the oil pump is connected with a filter; an oil tank is arranged below the filter; an oil pump pressure sensor is mounted at an outlet of the oil pump; a valve opening A of a unidirectional cartridge valve is connected with the outlet of the oil pump; a valve opening B of the unidirectional cartridge valve is connected with a valve opening A of a pressure valve insertion piece; a valve opening B of the pressure valve insertion piece is connected with the oil tank; a valve opening P of a direction cartridge valve is connected with the valve opening A of the pressure valve insertion piece; a valve opening T of the direction cartridge valve is connected with the oil tank; the valve openings A and B of the direction cartridge valve are connected with two cavity valve openings of an oil cylinder; and an oil cylinder pressure sensor is connected with the valve opening P of the direction cartridge valve. The quick hydraulic control device of the hydraulic injection molding machine guarantees long service lives and stable work of the motor and the oil pump and ensures that a hydraulic system works normally; a high-flow working condition is met; furthermore, the quick hydraulic control device is high in response speed and high in control precision and ensures that the injection molding speed is high and different working stages are switched; and the production efficiency and the precision of a product are improved.

The invention relates to a precision pressure control system and a hydraulic machining method of a servo pump control hydraulic machine. The hydraulic machine comprises a medium-flow servo pump and alarge-flow servo pump driven by a servo motor, outlet pipelines of two pumps are connected with a main cylinder upper cavity oil way through a seventh dynamic valve, and the main cylinder upper cavityoil way is further connected with an oil tank through a fourth dynamic valve and a proportional valve; a main cylinder lower cavity pipeline is connected with an outlet of a ninth cartridge valve, aninlet of the ninth cartridge valve is connected with the oil tank through a fifth cartridge valve and an eighth cartridge valve, the fifth cartridge valve supplies supporting force during deceleration and pressurization through an overflow valve, and the eighth cartridge valve is turned on during the return stroke. In hydraulic machining, each working cycle comprises the following actions of automatic pressure compensation for an energy accumulator, pressure supplementation stopping for the energy accumulator, rapid descending of a sliding block, deceleration pressurizing of the sliding block, pressure maintaining of the sliding block, pressure relief of the sliding block, and return and stopping of the sliding block. The servo driver is switched in two modes of flow control and PID regulation control, stable pressurization of the sliding block is achieved, the phenomenon that a part deforms due to pressurization overshoot is avoided, and pressure relief is stable.

The invention discloses a numerical control hydraulic machine decompression system based on pressure feedback, and relates to the technical field of hydraulic machines. The numerical control hydraulic machine decompression system comprises a pressure sensor, a programmable logic controller and a proportional overflow valve, wherein the pressure sensor is used for collecting oil pressure data of a slide block main cylinder, the programmable logic controller is used for receiving the oil pressure data, dividing the oil pressure data into sections according to the oil pressure data, and outputting different linear control commands in the different sections, and the proportional overflow valve is used for regulating oil pressure in the slide block main cylinder according to the linear control commands. The pressure sensor is electrically connected with an analog quantity input port of the programmable logic controller. An analog quantity output port of the programmable logic controller is electrically connected with the proportional overflow valve. The decompression of a slide block is controlled continuously in a variable-rate mode by controlling the rate of continuous progressive decrease of the proportional overflow valve according to the corresponding relationship between the oil pressure data of the slide block main cylinder and the slope of the ramp function of the proportional overflow valve. Therefore, the aims of high-pressure and small-slope stable decompression and low-pressure and large-slope rapid decompression are achieved.

The invention discloses a pilot safety valve, and relates to the technical field of safety protection equipment for natural gas collection and transmission pipelines. The pilot safety valve disclosedby invention includes a pilot valve and a main valve; the pilot valve includes a pilot valve seat, a pilot valve clack, a pilot valve stem, a lower valve body, an upper valve body and a pilot valve cover; the main valve includes a main valve body, a main valve seat, a main valve core, a main valve sleeve and a main valve cover; a valve seat sealing O-ring is arranged on the end surface of the pilot valve seat; an annular dovetail groove is opened on the end surface of the pilot valve seat; the valve seat sealing O-ring is fixed in the annular dovetail groove; a boss is arranged on the valve clack of the pilot valve; and when closing, the boss at the bottom of the pilot valve clack enters the annular dovetail groove and axially compresses the valve seat sealing O-ring to deform, and the pilot valve closes. The pilot safety valve disclosed by the invention has good sealing performance and low failure rate, can increase the set pressure value of the pilot safety valve to 32 MPa, and has the characteristics of high-precision discharge, small return pressure, and obvious bursting effect.

The invention discloses a device for automatically balancing tire pressure in the running process of an automobile. The device comprises two air chambers which are respectively arranged at the two ends of the axle of the automobile, can be connected through a valve for balancing the pressure difference of the two air chambers, and are respectively communicated with air cavities of adjacent tires. The device for automatically balancing the tire pressure in the running process of the automobile has the advantages of simple structure, low cost, high safety and reliability and convenience in popularization and application.

The invention relates to the technical field of booster pumps for a reverse osmosis system, and provides a booster pump with a self pressure stabilizing performance. The booster pump comprises a motor part and a bump head part, wherein a pump head is internally provided with a piston frame, a diaphragm and a diaphragm chamber, a plurality of check valves are arranged on the diaphragm chamber, a pressure stabilizing passage is arranged between the upper part of the diaphragm chamber and a fluid chamber, and is used for communicating a low pressure chamber with a high pressure chamber, a valve used for controlling the open and closure of the pressure stabilizing passage is arranged on the fluid chamber and is located at one side of an axis of an water inlet and a water outlet; the valve comprises an outer ring rib and an inner ring rib which are located at the middle part, the inner side of the inner ring rib is provided with a buffer relief hole, a buffer water inlet is connected with a spirally ascending relief buffer area of which the tail end is in sealing connection with the buffer relief hole in a separable manner though a spring and valve block structure at the upper part. According to the booster pump, water of which the pressure excesses a setting pressure is split to the lower pressure chamber through a valve block by virtue of the pressure stabilizing passage, the safety of the whole device is ensured, the service life is prolonged, the vibration of a pump body is reduced, the valve block is in torus contact with the buffer relief area, so the circumferential sealing performance is good, and a relief process is stable.

The invention provides a structure-optimized machine oil pump with an idle gear. The machine oil pump comprises a pump body, a pump cover, an idle gear shaft, the idle gear and a bolt; an oil cavity is formed in the pump body; an idle gear shaft mounting hole is formed in the pump cover; the idle gear shaft is provided with an axial bolt mounting hole and a lubricating through hole intersected with the bolt mounting hole; the idle gear sleeves the idle gear shaft; a screw plug fixes the idle gear shaft on the pump cover; the diameter of the bolt is smaller than the aperture of the bolt mounting hole of the idle gear shaft; an annular gap is formed between the bolt and the inner wall of the bolt mounting hole; an oil passing groove is formed in the side, near an oil cavity, of the round hole bottom surface of the idle gear shaft mounting hole; an inclined oil hole communicating with the oil cavity is drilled in the pump cover through the oil passing groove; high-pressure oil in the oilcavity flows into a gap between an idle gear bushing and the idle gear shaft through the inclined oil hole, the oil passing groove, the annular gap and the lubricating through hole in sequence; and oil leakage grooves are formed in two end surfaces of a shaft table of the idle gear.

The invention discloses a flexible control method of a forging press, and belongs to the technical field of forging press control. The flexible control method of the forging press is characterized by comprising the following steps: S100, forging and pressing speed control: a forging and pressing speed is adjusted by detecting the speed of a sliding block of the forging press and further inputting the flow of an oil cylinder; and S200, flexible pressure control: flexible pressure relief control is realized by controlling the holding pressure of a die assembly cylinder of the forging press and controlling three-stage pressure relief and proportional overflow. By adopting the technical scheme, the invention provides the pressing speed control method based on an integral separation PID method; and the stroke of the sliding block is monitored in real time, and the flexible pressure relief control over the forging press is carried out by combining a three-level pressure relief valve group and a cosine curve control method of a proportional overflow valve according to the influence of an unloading process on the vehicle shape quality of wheels.

The invention discloses a smart home data collecting system based on ZigBee, belongs to the technical field of smart homes, and aims at providing the smart home data collecting system with higher reliability and instantaneity. According to the technical scheme, the smart home data collecting system comprises a water meter, a ZigBee wireless communication module, a ZigBee routing module, a ZigBee coordinator, a GPRS module and a central processor. A water meter sensor in the water meter transmits water volume data information collected by the water meter sensor to the ZigBee coordinator through the ZigBee wireless communication module and the ZigBee routing module in sequence, and the ZigBee coordinator transmits the received water volume data information to the central processor through the GPRS module and a GPRS network. The smart home data collecting system is suitable for being used as a data collecting system in a smart home.

The invention relates to an oil extraction wellhead sealing device which comprises a sealing device shell, a slag removal disc and a gradienter; a polished rod is arranged in the sealing device shell in a penetrating mode; the gradienter is fixed to the lower portion of the polished rod; connecting plates are installed on the left side and the right side of the gradienter correspondingly; sliding parts are installed on the sides, close to the gradienter, of the connecting plates; a sealing air bag is connected with the interiors of the sliding parts; a movable sliding rail is arranged at joints of the sliding parts and the connecting plates; and an inflation pipe is connected with the upper portion of the sealing air bag. According to the oil extraction wellhead sealing device, the gradienter is adopted to monitor the perpendicularity of the polish rod in real time and transmit data to a PLC, the PLC can control a centralizer to work according to received data, the position of the polish rod is adjusted, and the situation that the polish rod is in a vertical state is guaranteed, so that the situation that the polish rod is inclined, and sealing is not thorough is avoided; and in addition, through the arrangement of the slag removal disc, waste scraps and waste residues generated on the surface of the polished rod can be cleaned.

The invention discloses a water retaining dam fixing formwork for a water conservancy project and a construction method thereof, and relates to the technical field of the water conservancy projects. The fixing formwork comprises a dam base layer and a gravel block filling frame, the sides, which penetrate through and extend out of a second side form baffle plate, of split bolts are in threaded connection with fixed nuts, and a filling baffle frame is fixedly connected between a first side form baffle plate and the second side form baffle plate; and a gravel block and clay mixture fills the portions among the filling baffle frame, the gravel block and clay mixture and the filling baffle frame are mixed to form a filling gravel block layer, the filling gravel block layer and concrete anti-permeation blocks form a water retaining dam inner base layer. According to the water retaining dam fixing formwork for the water conservancy project and the construction method thereof, the partitioning construction is achieved, so that the construction difficulty is reduced, the construction time is shortened, meanwhile, the toughness of the water retaining dam is increased, and the service life of the water retaining dam is prolonged; and constant-gradient water discharging is achieved during flood releasing and water discharging, so that the purpose of stably releasing the pressure during flood control of the water retaining dam is achieved.

The invention discloses an intelligent household data acquisition system based on GSM, is the data acquisition system belonging to the intelligent household technology field and aims to realize properties of remote distance data transmission and rapid data transmission speed. The intelligent household data acquisition system based on GSM is characterized by comprising a water gauge, an acquisition device, a GSM communication module and a controller, wherein a water gauge sensor of the water gauge is electrically connected with the acquisition device, the acquisition device is electrically connected with the GSM communication module, and the GSM communication module is electrically connected with the controller. The intelligent household data acquisition system based on GSM is suitable for data acquisition.

The invention discloses an indoor safety pressure relief fuel gas pipeline which comprises a fuel gas pipeline body. A collecting block is fixed to the lower end face of the fuel gas pipeline body; agas pressure sensing mechanism for sensing the gas pressure in the pipeline is arranged in the fuel gas pipeline body; a gas pressure collecting device for collecting and relieving pressure is arranged in the collecting block; a fuel gas discharging mechanism for selectively discharging fuel gas is arranged at the left end of the collecting block; and when the gas pressure in the fuel gas pipelineis too large, a sensing block in the pipeline senses pressure intensity changes and automatically starts a pressure relief function, redundant fuel gas can be automatically collected in the pressurerelief process, and when the collected fuel gas is too much, a standby pressure reduction function is automatically started, so that stable pressure relief and pressure intensity balance of the fuel gas pipeline are further guaranteed, the collected fuel gas can be refilled into the fuel gas pipeline or taken out to be treated separately, and the process can be guaranteed to be carried out safelywhile pressure relief is carried out on the fuel gas pipeline.

The invention discloses a solar ground-source heat pump system which comprises a solar heat collector and a buried pipe and also comprises a first water tank, a second water tank and a mixed water tank, wherein a first heat exchanger is arranged between the solar heat collector and the first water tank; a first water pump is mounted on the first heat exchanger; a second heat exchanger is arrangedbetween the buried pipe and the second water tank; a second water pump is mounted on the second heat exchanger; the first water tank communicates to the mixed water tank through a first bidirectionalgear pump; the second water tank communicates to the mixed water tank through a second bidirectional gear pump; the solar heat collector communicates to the buried pipe through a third bidirectional gear pump; and pressure relief valves are separately arranged on two sides of the third bidirectional gear pump. The system disclosed by the invention can improve the defects in the prior art, and thepressure fluctuation of system operation is reduced effectively.

The invention relates to a piston for a safety belt pre-tightening function. The piston is provided with a front side, a circumferential side, a rear side, and a gas flowing channel which is formed inthe piston and connects the rear side to the front side or the circumferential side in a flow manner; the gas flowing channel is closed by a closing element and can be released when current pressurereaches or exceeds predetermined pressure; and the gas flowing channel is provided with a dissipation structure for dissipating energy of gas flow flowing through the gas flowing channel. The invention also relates to a safety belt retractor comprising such a piston and to a pre-tightening safety belt comprising such a safety belt retractor. In a collision accident, when the pressure of gas generated by a gas generator is too large, stable pressure relief can be achieved through the gas flowing channel, pressure drop during pressure relief is relieved while pressure relief is controlled, and meanwhile, flames possibly carried by the gas flow during pressure relief are restrained.

The invention discloses an intelligent household highly real-time data acquisition system based on Wi-Fi, belongs to the data acquisition system in the intelligent home technical field, and aims to provides the intelligent household highly real-time data acquisition system which is higher in reliability and real-time performance. According to the technical scheme, the intelligent household highly real-time data acquisition system comprises a water meter box body, a water meter, a WiFi communication module, a wireless interrupter, a wireless AP module and a central processor; a water meter sensor in the water meter is electrically connected with the WiFi communication module; the WiFi communication module is connected with the wireless interrupter through a wireless network; the wireless interrupter is connected with the wireless AP module through the wireless network; and the wireless AP module is connected with the central processor through a wired network.