65results about How to "Eliminate hidden dangers of safety accidents" patented technology

The invention discloses an intelligent detection system and a detection method of press plate positions. The system comprises at least two intelligent press plates, a repeater and an upper computer, wherein all the intelligent press plates are connected in a cascaded mode and upload self position information to the repeater through a bus network; the repeater is connected with the upper computer in a network mode and used for transmitting the position information of all the intelligent press plates through a network; and the detection system is used for monitoring the real-time on-off states of the intelligent press plates and recording historical running data and can be further upgraded into an expert system for running the press plates. The invention solves the problem of position monitoring of control / tripping press plates of a relay protection system in a power system, realizes the automation of the monitoring of the press plate positions, can accurately reflect the positions of the press plates in real time and avoid error press plate on-off caused by artificial factors, eliminates safe accident hidden troubles caused by error press plate on-off, achieves scientific prevention before accidents and greatly improves the running safety of a power grid.

The invention discloses an electric closed-loop flow control adjusting valve. A displacement sensor is coaxially arranged on a main valve core to detect the main valve core displacement; output signals of the displacement sensor are input to a measuring amplifier, and are transformed and amplified by the measuring amplifier to generate feedback signals; the feedback signals are input to a subtracter, the subtracter receives command signals and the feedback signals of control valve opening, the command signals and the feedback signals are subtracted to obtain a deviation signal which is input to closed-loop control equipment; the deviation signal is corrected by the closed-loop control equipment and is input to an adding device; a feedforward controller receives the command signal and corrects the deviation signal, the deviation signal is input to the adding device; and the adding device performs adding operation on output signals which are output by the closed-loop control equipment and the feedforward controller, and the added signals are input to a proportional amplifier to control output force of an electromechanical transducer. An electric closed loop channel is superimposed on an inner mechanical feedback path; when the displacement sensor or the displacement measuring amplifier is abnormal, the valve opening quantity is still can be controlled successively; and the normal operation of the valve system is guaranteed, the reliability of the system is improved, and the control precision and response speed are improved obviously.

The invention discloses an electric locomotive shunting control method, which is used for realizing shunting control of an electric locomotive. The method comprises the steps that: a shunting control mode is activated after a shunting control activating command sent by an intelligent display unit is received; an auxiliary contact signal acquired by an input-output unit of a cab is received, and the state of the locomotive is determined according to the auxiliary contact signal; a maximum traction value / a maximum brake value is obtained, a voltage output signal acquired by the input-output unit of the cab is received, and a traction force request value / a braking force request value is obtained according to the maximum traction value / the maximum brake value and the voltage output signal; a traction force value / a braking force value of the locomotive in shunting is obtained according to the traction force request value / the braking force request value; and the traction force value / the braking force value is sent to a traction control unit, so that a needed traction moment / braking moment is provided for the locomotive by the traction control unit according to the traction force value / the braking force value. The invention also discloses an electric locomotive shunting control system and device.

The invention relates to a method for the automatic measurement of span and linearity of orbits in elevating machinery. The method comprises the following steps of: 1) arranging a prism as public reference point between orbits; 2) arranging a total station system at a head end C of an orbit A, arranging a measuring point prism on the orbit in a way that the prism can move along the orbit; 3) allowing the measuring point prism to move from the head end C to a tail end E of the orbit, tracing and recording the three-dimensional coordinate (xa, ya, za) of the motion track of the prism on a small rail car by using the total station system, and simultaneously recording the height difference hc between the point and the total station system, based on the public reference point; 4) arranging the total station system and the measuring point prism at a head end D of another orbit B, recording the three-dimensional coordinate (xb, yb, zb) of the motion track of the prism on the small rail car, and simultaneously recording the height difference hd between the point and the total station system, based on the public reference point; and 5) calculating the linearity and the levelness of each orbit and calculating the span and the height difference of the same sections between two orbits.

The invention relates to a method for the automatic detection of spatial relationship of orbits in elevating machinery. The method comprises the following steps of: 1) arranging more than three prisms as public reference points between orbits; 2) arranging a total station system at a head end C of an orbit A, arranging a measuring point prism on the orbit in a way that the prism can move along the orbit; 3) allowing the measuring point prism to move from the head end C to a tail end E, tracing and recording the three-dimensional coordinate of the motion track of the measuring point prism on a small rail car by using the total station system, and simultaneously recording the relative coordinates of the relative spatial positions of the points and the total station system, based on each public reference point; 4) repeating the step 3: tracing and recording the three-dimensional coordinate of the motion track of the prism on the small rail car by using the total station system, and simultaneously recording the relative coordinates of the relative spatial positions of the points and the total station system, based on each public reference point as reference; and 5) calculating the linearity and the levelness of each orbit and calculating the span and the height difference of the same sections between two orbits.

The invention discloses an electrolyte plasma polishing device. According to the device, a safety door is fixedly arranged at the front end of a work box, and does the vertical movement through a moving mechanism; the moving mechanism is controlled by a control device; after polishing of a polished part ends, due to the arrangement, a worker can control up-down movement of the safety door throughthe control device; and the safety door can be automatically opened, and the possibility that due to the fact that the worker perform workpiece extracting, the worker is scalded is effectively avoided. A polished part hanging frame is connected to the front end of a suspending device, and an insulating device is fixedly arranged at the joint of each connection side plate and a lifting table. Due to the fact that the insulating devices are adopted for the electrolyte plasma polishing device, insulating treatment is performed on the suspending device and the connection side plates of the hangingframe, the phenomenon that a motor is in live line work, and the service life is shortened is effectively avoided, the service life of an electric appliance element is prolonged, the treatment efficiency of a polished workpiece is improved, so that electrolyte plasma polishing device framework installing and debugging difficulty is lowered, an electric appliance device is protected, and the service life of the electric appliance device is prolonged.

The invention relates to a method for measuring the plane relationship and the relative height difference between orbits in elevating machinery. The method comprises the following steps of: 1) arranging two prisms as public reference points G and H between orbits; 2) arranging a total station system at a head end C of an orbit A, arranging a measuring point prism capable of moving along the orbit; 3) allowing the measuring point prism to move from the head end C to a tail end E of the orbit A, measuring and recording the three-dimensional coordinate of the motion track of the measuring point prism on a small rail car by using the total station system, and simultaneously recording the spatial coordinate of the relative positions of the reference points G and H and the total station system, based on the public reference points; 4) measuring and recording the three-dimensional coordinate of the motion track of the measuring point prism on an orbit B in the same way as the step 2; and 5) calculating the linearity and the levelness of each orbit and calculating the span and the height difference of the same sections between two orbits.

The invention discloses a locking mechanism, application of the locking mechanism and a locking control method used for the locking mechanism. A rotary outputting piece is locked by a connecting rod mechanism and a stable triangular supporting structure between a first lock piece and a second lock piece, the second lock piece effectively restrains the first lock piece, and reliability of locking and unlocking of a product is realized. The whole locking mechanism is controlled by the same switch piece, and a control process is compact and effective. From a mechanical structure and an automaticcontrol method, mistaken locking operation of a rotary piece during running is avoided effectively, locking reliability is high, the locking mechanism is simple and convenient to use, the whole rotarylocking mechanism can be sealed and fixed in a vehicle lock shell, and the locking mechanism is applied to transmission machinery of bicycles, electric bicycles, motorcycles and even light automobiles.

The invention discloses a tractor chassis self-weight load type running-in purification test stand and process. The tractor chassis self-weight load type running-in purification test stand comprises an input mechanism, a lifting mechanism, a rear axle installation locating mechanism, a front end installation locating mechanism, an input machine base, a rear axle machine base, a base, a hydraulic system, a hydraulic purification system and an automatic control system. The running-in purification process of the test stand is further disclosed. According to the tractor chassis self-weight load type running-in purification test stand and the running-in purification process, running-in purification can be conducted by utilizing the self-weight load of a tractor chassis transmission system under the condition that an external loading mechanism is not added, potential safety hazards inside the transmission system are removed, energy and time are saved, and production efficiency and quality of the whole vehicle are improved.

The invention discloses a safety belt suspending device for upper construction of a transformer, and the safety belt suspending device is used for the transformer. The safety belt suspending device comprises two or more than two splicing devices, wherein each splicing device comprises a splicing tube and a base fixedly connected on the top of the transformer; each base comprises a bottom plate and a stand column; each stand column is fixedly connected on each bottom plate; the quantity of the stand columns is equal to that of the splicing tubes; each bottom plate is fixedly connected on the transformer; a plurality of rib plates are arranged between the peripheries of the stand columns and the bottom plates; and the stand columns are vertically arranged. The safety belt suspending device can effectively solve the problem that protection is lost due to the fact that the safety belt for a worker on the upper part cannot be suspended when the transformer is mounted and maintained, cannot be suspended at a low place for use in a high place, and is movable in operation position.

The invention discloses a heavy door and a mounting method. The stability of the heavy door in the using process can be improved; the heavy door can bear a larger load, has better stiffness, is more suitable for low-speed and heavy-load using scenes, is simple in structure, convenient to mount and convenient to open, and is suitable for frequent use; improvement on the safety coefficient of the heavy door is facilitated; a superhigh and superheavy door leaf is effectively prevented from sinking down, falling out and shifting, so that the service life of the door is prolonged; the post maintenance cost is effectively reduced, and the cost of an entrance door project is saved; the quality of the project is improved, and potential safety accidents are avoided; the heavy door can be conveniently and quickly mounted, and improvement on the construction safety is facilitated; alignment of an earth axis and a celestial axis is facilitated so as to control the verticality of the door leaf.

The application discloses a guide vane water leakage detection system, comprising a distance sensor, a central controller and a liquid level detection device, wherein the liquid level detection devicecomprises a liquid level meter, a through pipe and a first bracket; the distance sensor and the liquid level meter are electrically connected to the central controller, respectively; the first bracket is arranged in the through pipe, the liquid level meter is arranged on the first bracket, and the arrangement direction of the liquid level meter is parallel to the axis direction of the through pipe; the liquid level meter is configured to detect the liquid level height at a vent hole, and the distance sensor is configured to detect whether a water inlet gate is located at the bottom of a waterinlet, and when the water inlet gate is located at the bottom of the water inlet, the distance sensor sends the information to the central controller, the central controller starts to record the liquid level height measured by the liquid level meter, and the central controller determines whether a guide vane has water leakage according to the liquid level change; when the liquid level measured atthe vent hole drops, the central controller determines that water leakage occurs. Thereby, the detection of the sealing effect of the guide vane can be achieved.

The invention discloses a chip anti-splash device for a milling machine, which is installed on the milling machine. The milling machine is equipped with a main shaft and a workbench. The anti-splash device includes a beam installed above the main shaft, an air channel arranged in the beam, and A plurality of nozzles installed vertically under the air channel; the beam is a cantilever structure, and the nozzles are installed along the side of the beam away from the main shaft; transparent cutting baffles are arranged on both sides of the workbench, and the transparent cutting baffle The top of the plate is in contact with the beam. In the present invention, nozzles are installed at one end of the beam of the machine tool and transparent cutting baffles are installed on both sides of the workbench, relying on the pressurized air flow ejected from the nozzles and the transparent cutting baffles to form a "U"-shaped anti-cutting and splashing area to seal the working area of ​​the machine tool , to avoid the chips splashing to the outside of the machine tool, causing hidden dangers of safety accidents, and the air wall and transparent cutting baffle will not affect the operator's sight, reducing the impact on processing after adding this device.

The invention discloses a filling gun capable of achieving safe filling. The filling gun adopts a piston power operation mechanism with double power cylinders and three cavities to drive an inner gun barrel and an outer gun barrel to do relative reciprocating motion, gun feeding and gun withdrawing operation of the filling gun is executed in a most reasonable pneumatic action mode, and further, a clamping mechanism and an air pressure adjusting hole are arranged in a matched mode, a power source pressure intensity adjusting control valve and the locking structure of the clamping mechanism enable clamping jaws of the clamping structure and an inner gun barrel gun head to be stably locked in the gun feeding action process of the filling gun, it is guaranteed that the safety accident of gun collapse does not occur in the gun feeding and withdrawing processes of the filling gun, and the continuous filling capacity of the power cylinders is improved.

The method for judging electric kettle water boiling includes the following steps: 1. mounting sensor, microprocessor and control circuit in the electric kettle; 2. utilizing sensor to detect water temperature, temperature of heating bottom disk contacted with water or temperature of side wall of electric kettle; 3. utilizing microprocessor to calculate water temperature change rate and making comparison; and 4. when the water temperature change rate is stable and minimum, giving out signal to control circuit to cut off power supply for heating.

The invention discloses vehicle rushing preventing equipment of a check point. The rushing preventing equipment comprises a metal structure main body, a transmission gear, a rotating device, a self-locking braking device, automatic / manual and wireless control equipment, and an automatic acousto-optic caution device, wherein the metal structure main body is of a hollow structure; the transmission gear is mounted on one sidewall of the metal structure main body; the rotating device is connected with the transmission gear and fixedly connected with the two sidewalls of the metal structure main body; the self-locking braking device is arranged in the metal structure main body, and one end of the self-locking braking device penetrates through the metal structure main body and is connected with the transmission device; and the automatic / manual and wireless control equipment is connected with the self-locking braking device and the automatic acousto-optic caution device. The vehicle rushing preventing equipment of the check point is easy to mount and capable of quickly and effectively performing forced safe traffic control on vehicles violating laws and rules by intelligent control, so that potential safety accident hazards are eliminated, the social harmony and stability coefficient is improved, and harm of people, damage of vehicles and loss of properties are greatly reduced.

The invention discloses an on-line detection system for a main speed reducer assembly test. The on-line detection system comprises a measurement and control cabinet, a plurality of PLC switching cabinets and a detection device; the measurement and control cabinet comprises an industrial personal computer and a display; the PLC transfer cabinet comprises a PLC module and a signal conditioning module; the detection device comprises a noise sensor, an infrared temperature measurement sensor and a pressure sensor which are respectively installed at corresponding positions on a test bed for testinga main speed reducer assembly and connected with the input end of a signal conditioning module, the output end of the signal conditioning module is connected with a PLC module, and the PLC module anda display are both connected with an industrial personal computer. The system realizes the functions of online acquisition, storage, printing and the like of test data, the test data is real, and theinfluence of human factors is avoided; abnormal phenomena in the test process can be timely alarmed, so that the expansion of accidents is avoided; meanwhile, an operator does not need to monitor ina test room, man-machine isolation is achieved, potential safety hazards are eradicated, and the intrinsic safety of the process is improved.

The invention discloses an automatic settlement monitoring device for large buildings or towering equipment and a use method. The automatic settlement monitoring device comprises a monitoring body which is arranged on one side of a vertical face of a building side wall, and has the upper end connected with the building side wall through a three-dimensional rotation fixing piece; a laser hammer which freely droops and is hung in the monitoring body; and a scale light-transmitting plate which is mounted at the bottom of the monitoring body. Laser emitted by the lower end of the laser hammer is projected to the scale light-transmitting plate to form a light spot, and settlement deviation can be visually monitored by observing the displacement of the light spot. The device is simple in structure, does not need a traditional monitoring instrument, and can observe at any time and immediately find whether a building, a structure or installed large-scale equipment is settled or not.

The invention discloses an automatic gluing system for bulletproof non-weft cloth. The automatic gluing system comprises a mounting frame, a filter screen, a suction head, a hook, a spring buckle, a liquid level controller, a gluing assembly, a stirring assembly, a filtering assembly, a first return pipe, a second return pipe and an automatic control valve, wherein a glue tank is welded on the outer wall of the top end of the mounting frame; gluing rollers are symmetrically arranged in the middles of the inner walls of the two sides of the glue tank; first supports are rotationally arranged onthe inner walls of the two sides, positioned above the gluing rollers, of the glue tank; and springs are welded on the outer walls of one sides of the middles of the first supports. According to theautomatic gluing system, all control systems are pneumatically controlled, so that the hidden danger of safety accidents in the use process of oily volatile solvents is avoided; glue liquid is alwaysin a flowing state in the glue tank and a glue pot, so that the phenomenon that the glue liquid is exposed in the air and is condensed is avoided, and the uniformity of gluing of the production clothsurface is guaranteed; and the automatic gluing system of the glue pot guarantees timely supplement of the glue liquid after the use of the glue liquid is reduced, so that the labor intensity of workers is reduced, and the working efficiency is improved.

An embodiment of the invention relates to an unmanned vehicle network anomaly processing method, device and equipment and a storage medium. The method comprises the steps: network signal intensity isdetected in a process that an unmanned vehicle drives according to a first planned path; when it is detected that the network signal strength is smaller than or equal to the first set strength, the unmanned vehicle is controlled to run to an area with the network signal strength larger than or equal to the second set strength; a path in the area of which the network signal strength is greater thanor equal to the second set strength is re-planned to obtain a second planned path, and the second planned path does not include the area of which the network signal strength is less than or equal tothe first set strength; the unmanned vehicle is controlled to travel on the basis of the second planned path, so as to solve the problems that once a conventional unmanned vehicle travels to an areawith an abnormal network, long-time parking is needed, the vehicle operation efficiency is seriously influenced, and safety accidents are easily and further caused.

The invention relates to a flexible reed grabbing device and method. The device comprises flexible grabbing mechanisms and a cross beam, the flexible grabbing mechanisms and the cross beam are arranged on a ship body, the flexible grabbing mechanisms are symmetrically arranged at two sides of the ship body, and the cross beam is connected with the flexible grabbing mechanisms at two sides of the ship body and is used for separating and clamping reeds. The reeds in lakeside water and on the shore can be grabbed in a variable-distance manner through the device, the device can be guaranteed to beused under the condition that the terrain of the lakeside shore is complex, the device can achieve change of the horizontal position and the vertical position, the reed separating and clamping function has better maneuverability, driving parts are electrically driven, pollution is avoided, the structure is simple, manufacturing cost is low, practicability is high, and operation is easy and convenient.

The invention discloses a fan tower hoisting tool and hoisting method. The fan tower hoisting tool comprises a compensation hoisting unit and a telescopic hoisting arm unit, the compensation hoisting unit is arranged above the telescopic hoisting arm unit, the compensation hoisting unit is connected with a hoisting device, and the lower end of the compensation hoisting unit is connected with the telescopic hoisting arm unit; the compensation hoisting unit is used for compensating the inclined motion of the telescopic suspension arm unit and keeping the telescopic suspension arm unit horizontal; and the telescopic suspension arm unit is connected with a tower to be mounted. According to the fan tower hoisting tool and hoisting method, the arm length can be adjusted to adapt to tower of different sizes, moreover, compensation can be provided during hoisting, and the towers are prevented from inclining.

The invention discloses an emergency shutoff device with both remote control and local mechanical control functions. An air compressor is connected with a solenoid valve, a quick release valve and a pneumatic actuator, the pneumatic actuator drives an emergency shutoff valve, an inlet of the emergency shutoff valve is connected with a wellhead natural gas pipeline, a pressure transmitter used fordetecting the wellhead natural gas pressure and the solenoid valve are connected with a controller correspondingly, a three-way valve is connected with an outlet of the solenoid valve, an inlet of thequick release valve and a gas outlet port of a high-and-low-pressure pilot valve, the inlet of the emergency shutoff valve is connected with a high-pressure port and a low-pressure port of the high-and-low-pressure pilot valve simultaneously, and a gas inlet port of the high-and-low-pressure pilot valve is connected with the outlet or inlet of the solenoid valve. The emergency shutoff valve can be remotely automatically or manually controlled through the controller and can also be locally automatically controlled through the high-and-low-pressure pilot valve, the monitoring reliability and accuracy of the wellhead natural gas pressure are remarkably improved, and hidden dangers of safety accidents are eradicated better.

The invention discloses an H-shaped wheel tightening device for a water tank wire-drawing machine. The tightening device comprises a first disc spring tightening mechanism and a second disc spring tightening mechanism which are symmetrically arranged at two ends of an H-shaped wheel in the axial direction. The first disc spring tightening mechanism comprises a first cylindrical mounting seat, a first fixing sleeve, a first end cap and a first sliding shaft; the first fixing sleeve is annularly arranged on a cavity of the first mounting seat and is attached to the inner wall of the cavity; thefirst end cap is arranged at one end of the cavity of the first mounting seat; the first end cap and the first fixing sleeve are fixed in the circumferential direction; and the first sliding shaft penetrates in the middle of the cavity of the first mounting seat in the axial direction. The second disc spring tightening mechanism comprises a second cylindrical mounting seat, a second fixing sleeve,a second end cap and a second sliding shaft, wherein the second fixing sleeve is annularly arranged on a cavity of the second mounting seat and is attached to the inner wall of the second mounting seat; the second end cap is arranged at one end of the cavity of the second mounting seat; the second end cap and the second fixing sleeve are fixed in the circumferential direction; and the second sliding shaft penetrates in the middle of the cavity of the second mounting seat in the axial direction. The H-shaped wheel tightening device for the water tank wire-drawing machine is simple in structure, and is safe and reliable, and thus, the working efficiency of rolling of steel cords is ensured.

The invention discloses an automatic control electric spark source device applied in the field of engineering survey and detection. The automatic control electric spark source device comprises a relay, wherein one end of the output end of the relay is connected with the live wire of an AC 220V power supply, the other end of the output end of the relay is connected with one end of the input end ofan AC transformer; the control end of the relay is connected to a controller through a circuit; the neutral line of the AC 220V power supply is connected to the other end of the input end of the AC transformer; the output end of the AC transformer is connected to the input end of a voltage doubling device; the output end of the voltage doubling device is directly connected to the input end of a high-voltage energy storage capacitor; and the controller controls the on-off state of the relay so as to realize a charging control function of the high-voltage energy storage capacitor. The automaticcontrol electric spark source device can automatically control charging and discharging, can greatly improve the field exploration efficiency, and reduce the labor cost. A synchronous trigger signal can trigger equipment such as a sonic instrument, a seismograph, a TSP instrument and the like, can be used in conjunction with the sonic instrument, the seismograph, the TSP and the like, avoids the idleness of the equipment and enhances the usage rate of the equipment.

The invention belongs to the technical field of steel coil packaging auxiliary control, and discloses a steel coil packaging auxiliary control system and method based on the internet of things. The steel coil packaging auxiliary control system based on the internet of things comprises a packaging parameter input module, a rotating speed detection module, a main control module, an internet-of-things communication module, a tightness adjusting module, a shearing module, a strapping control module, a weight checking module and a display module. According to the steel coil packaging auxiliary control system and method based on the internet of things, through the strapping control module, the problem that a steel coil is strapped once or twice in time according to the thickness change is effectively solved, and the potential safety hazard caused by the fact that the steel coil slides and falls at a bell type annealing furnace after the strap is broken due to the fact that strapping is skipped twice is avoided; and meanwhile, the weighing metering error can be found in time through the weight checking module, so that the metering dissent is avoided, the dissent claim payment amount is reduced, the occurrence of a metering dissent condition is avoided, the technical level of an enterprise is improved, and the image of the enterprise is maintained.

The invention discloses a locking assembly, a vehicle lock and a locking control method thereof. A rotary outputting piece is locked by a stable triangular supporting structure formed by a sliding first lock piece and an oscillating second lock piece, the second lock piece effectively restrains the first lock piece, and reliability of locking and unlocking of a product is realized. The whole locking assembly is controlled by the same switch piece, and a control process is compact and effectively. From a mechanical structure and an automatic control method, mistaken locking operation of a rotary piece during running is avoided effectively, locking reliability is high, the locking assembly is simple and convenient to use, the whole rotary locking assembly can be sealed and fixed in a vehiclelock shell, and the locking assembly is applied to transmission machinery of bicycles, electric bicycles, motorcycles and even light automobiles.

The invention relates to an air valve device. The air valve device comprises an air valve body, and a sealing device; the air valve body is arranged in a control guide pipe of a multipath pipe casting; the sealing device is sleeved on the air valve body; the air valve device is characterized by also comprising a trigger device which is arranged between the air valve body and an external stroke indication device and comprises a linkage trigger rod of which one end is connected with the air valve body, and a trigger button connected with the other end of the linkage trigger rod; and the stroke indication device is arranged on the outer side of the control guide pipe of the multipath pipe casting, matched with the trigger device and corresponds to the trigger device. As stroke indication marks which are engraved according to colors at intervals, and a trigger button are arranged, the stroke process of the air valve body connected with the trigger device in the control guide pipe of the multipath pipe casting can be displayed intuitively; according to the brightness and the darkness of a working indication lamp, the air valve device can show whether the air valve body is closed totally so as to remind an operator of keeping mixing materials or not, so the problem of product quality can be avoided, and the potential hazard caused by blind manual inspection of the operator who does not know the closed state.

The invention discloses a check valve for preventing leakage of an oil tank, which relates to the technical field of manufacture of valves and comprises an upper cover, a bottom bracket, a valve core, a valve sheet, a clamp and a spring, wherein the upper cover is connected with the upper end of a valve body; the bottom bracket is connected with the lower end of the valve body; the spring is arranged between the valve core and the bottom bracket; the valve sheet is fixedly connected to the upper top end of the valve core; the clamp is sleeved on the upper part of the valve body; a through hole is arranged in the center of the upper end surface of the valve body; through holes are respectively arranged in the centers of the upper cover and the bottom bracket; a metal head valve is arranged between the upper end surface of the valve body and the upper cover; the metal head valve is a circular plate; a circular boss is arranged in the middle of the circular plate; at least two through holes and at least three convex claws are uniformly distributed on the circular plate on the periphery of the circular boss; the height of the convex claws is larger than that of the boss; and the circular boss and the convex claws face the valve body. The check valve can be used for cutting an oil path in proper time, eliminating hidden danger of vehicle safety accidents caused by leakage of oil, and reducing the volatilization of gasoline so that the automobile emission achieves national standards.

The invention discloses a charging pasting machine which comprises an alternating current supply system, a direct current supply system, a direct current motor and a control circuit, wherein the alternating current supply system comprises an alternating current power supply and an alternating current / direct current change-over switch power supply; after the alternating current power supply is converted to a direct current power supply by the alternating current / direct current change-over switch power supply, the direct current power supply is electrically connected with the direct current motor; the direct current supply system comprises a storage battery; the storage battery is electrically connected with the direct current motor; and the control circuit allows only one of the alternating current supply system and the direct current supply system to supply power to the direct current motor at the same time. The light charging pasting machine can operate under the condition of an external power supply or without the external power supply, saves energy and electricity, and is safe, light in overall weight and easy to move.