141 results about "Pressure triggering" patented technology

An improved pressure activated control apparatus is provided for sensing fluid pressure and triggering one or more switches in response to the fluid pressure, as desired. The apparatus is designed to be placed within a fluid of a reservoir. The apparatus includes a first resilient member, such as a pliable rolling diaphragm or bellofram, having an outer surface exposed to the fluid and responsive to the fluid pressure. The pressure activated control apparatus includes a second resilient member, such as a spring with a chosen spring constant, k, that provides a biasing force against the diaphragm that is opposite the fluid pressure. A transducer is operative to monitor changes in pressure of gases within the apparatus causes by movement of the diaphragm. A controller is responsive to the transducer and selectable fluid level thresholds to activate pumps and / or valves for adjusting the level of the fluid in the reservoir.

The invention discloses a pressure triggering device used for electronic device, comprising a pressure sensor, a resistance strain wire and a pressure setting module; wherein, one end of the resistance strain wire is connected with the pressure sensor, and the other end is connected with the body of the electronic device and used for amplifying variation of resistance value of the pressure sensor. The pressure setting module is used for receiving resistance value variation of the resistance strain wire and converting the variation into corresponding pressure value, and the electronic device can realize different application functions according to the pressure values output by the pressure setting module. The invention also provides an electronic device comprising the device. By adopting the pressure triggering device and electronic device of the invention and extruding the side of the device, people are free to choose functions of making a call, playing music, playing games and reading documents. Besides, after locking application of playing music or reading documents, chapter quantity turned forward or backward and number of pages turned forward or backward can be controlled by pressure value.

The invention discloses a positive-pressure pneumatic type automatic water sample sampler comprising a sampling water storage bin, a counter weight bin and a high-pressure gas storage pot, wherein the upper part of the sampling water storage bin is provided with a sampling port; a gas-liquid piston cylinder is arranged under the sampling port and separated into an upper gas cavity and a lower liquid cavity through a piston plate; the cylinder wall at the bottom of the lower liquid cavity is provided with a liquid outlet; the liquid outlet is provided with a liquid drainage one-way valve; the upper gas cavity of the gas-liquid piston cylinder and the high-pressure gas storage pot are connected through a pipeline; the pipeline is provided with an environment pressure control valve; the bin wall of the counter weight bin is provided with a seawater inlet / outlet through hole; a gas bag is arranged in the counter weight bin; a gas inlet of the gas bag and the high-pressure gas storage tank are connected through a gas inlet pipeline; the gas inlet pipeline is provided with a gas inlet control valve of the gas bag; the cylinder wall at the bottom of the lower liquid cavity is provided with a pressure triggering button matched with the gas inlet control valve of the gas bag. By adopting the underwater pneumatic technology, a water sample with the set depth can be automatically sampled, the positive-pressure pneumatic type automatic sampler can automatically reset and can be applied to a variety of occasions, and a collected sample can be taken out.

A method for providing a pressure reference level for pressure triggering a ventilator responsive to a spontaneous breathing attempt by a patient. In the method, the patient connection of the breathing circuit is capped or plugged. A gas flow is then provided through the breathing circuit and is altered to an amount that causes the flow resistance properties of the breathing circuit to generate a desired gas pressure in the breathing circuit suitable for use as a reference pressure by the ventilator for pressure responsive triggering. During the operation of the ventilator, gas flow in a corresponding amount serves as a bias flow in the breathing circuit to assist breathing by the patient. The bias flow also generates the reference pressure level in the breathing circuit. A reduction in pressure from the pressure level resulting from inhalation by the patient triggers the operation of the ventilator.

The invention provides a touch control equipment control method and device and touch control equipment. The touch control equipment control method includes the steps of detecting at least two pressure values of touch operations on a touch screen and controlling the touch control equipment to carry out a preset pressure triggering event when the at least two pressure values comprise at least two pressure values in different pressure ranges. According to the technical scheme, the mis-operation problem can be effectively solved, a user can conveniently operate the touch control equipment and user experience is effectively improved.

A method for providing a pressure reference level for pressure triggering a ventilator responsive to a spontaneous breathing attempt by a patient. In the method, the patient connection of the breathing circuit is capped or plugged. A gas flow is then provided through the breathing circuit and is altered to an amount that causes the flow resistance properties of the breathing circuit to generate a desired gas pressure in the breathing circuit suitable for use as a reference pressure by the ventilator for pressure responsive triggering. During the operation of the ventilator, gas flow in a corresponding amount serves as a bias flow in the breathing circuit to assist breathing by the patient. The bias flow also generates the reference pressure level in the breathing circuit. A reduction in pressure from the pressure level resulting from inhalation by the patient triggers the operation of the ventilator.

A portable, self-contained powered sprayer to produce a foam effluent spray from a liquid. The sprayer includes segregated air and liquid delivery systems that separately supply air and liquid to a mixing chamber. The liquid delivery system may include a pump for pumping liquid from a tank to the mixing chamber via a liquid supply line. The air delivery system may include a compressor for supplying pressurized air to the mixing chamber via an air supply line. The mixing chamber may be defined within a flow controller. In one embodiment, the sprayer includes control circuit for engaging and disengaging the pump and the compressor in response to operation of the flow controller. The control circuit may include a pressure switch operatively connected to the liquid supply line to trigger operation of the pump and the compressor in response to pressure within the liquid supply line.

A differential pressure valve has a valve body containing a main piston axially moveable therein to open a fluid inlet to a fluid outlet at preset high pressure and to close at a preset lower pressure. A high pressure trigger piston and a low pressure trigger piston are operable in the main piston to alternately engage and lock the main piston to the valve body in one of the closed and open positions. A ball shifts in a port in the main piston to alternately straddle between at least one annular locking groove in the valve body and a release recess in a respective trigger piston. The ball can shift to alternately reside to straddle the valve body and main piston in the locked position or to straddle the main piston and trigger piston in the unlocked position. The trigger pistons and main pistons are mechanically biased to urge the pistons against the fluid pressure at the inlet.

The invention discloses a negative pressure pneumatic type automatic sampler for a water sample in a medium-deep layer. The negative pressure pneumatic type automatic sampler comprises a sampling water storage chamber, a balance weight device and a gas-liquid tank, wherein a sampling hole is formed in the upper part of the sampling water storage chamber, a gas-liquid piston cylinder is arranged below the sampling hole, a liquid storage cavity of the gas-liquid piston cylinder is connected with the gas-liquid tank through a pipeline, an environmental pressure control valve is arranged on the pipeline, a balancing weight of the balance weight device is fixed on a balancing weight frame through a balancing weight fixed releasing control valve, the balancing weight fixed releasing control valve is connected with the gas-liquid tank through a water returning pipeline, a water returning control valve is arranged on the water returning pipeline, and a pressure trigger button matched with a water returning control valve is arranged at the bottom of the liquid storage cavity. The negative pressure pneumatic type automatic sampler submerges in water under the action of gravity of the balancing weight, so that the water sample in the medium-deep layer with the depth of below 10-30m is automatically acquired, the balancing weight is discarded, a device automatically returns and the acquired sample is brought out due to the adoption of an underwater negative pressure pneumatic technology.

A cylinder apparatus with a capability of detecting a piston position includes a cylinder, a throttling valve, a positive limit and a pressure switch. A piston is movably mounted in the cylinder. A piston rod with an outside end protruding out of the cylinder is attached to the piston and adapted to push an object. The cylinder is connected to a pump with pipes. The throttling valve and the pressure switch are connected to the pipes, and the pressure switch is installed between the cylinder and the throttling valve. Consequently, when the pump starts pumping, the piston rod pushes the object to abut the positive limit. The stopped movement of the piston rod will change the pressure in the cylinder that triggers the pressure switch to send a signal to a controlling host to stop the pump.

A tool for setting blind fasteners is disclosed. A stem of a fastener is engaged by a pulling head and its sleeve is also engaged by the pulling head. In an initial stage, a pump piston compresses fluid in a hydraulic pump, affecting movement of a drawbar and piston in relation to a stationary adaptor connected to the tool, pulling the stem in relation to the sleeve at a fast rate per pump. As the pulling force increases, pressure in the pump triggers a logic system to shift the tool into a high pressure mode, decreasing the effort to complete fastener installation. The logic system resets after each squeeze of the lever, minimizing the number of pumps necessary to complete the installation while keeping effort at a comfortable level. An adjustable pressure relief valve allows the fluid to return to the reservoir chamber, returning the tool to its initial condition.

The invention relates to a hand-held electric washer, which comprises a motor, a high-pressure pump, a spray gun and a control switch, wherein a plunger is arranged inside a pump body of the high-pressure pump; a water inlet valve is arranged inside a plunger hole; a pump head is provided with a water inlet A, a water outlet A and a water return opening; the water inlet A is communicated with a water inlet seat through the water inlet valve; the water inlet seat is provided with a water inlet B and a water outlet B; the water inlet B is connected with a water source; the water outlet B is communicated with the water inlet A and the water return opening; the water outlet A is communicated with the water outlet seat through a water outlet valve; and a water outlet seat is communicated with the water return opening. The hand-held electric washer is characterized in that the motor, the high-pressure pump, the spray gun and the control switch are arranged inside the same gun shell; the control switch comprises a high-pressure trigger and a low-pressure trigger; the high-pressure trigger is provided with a transmission shaft and connected with a water pause switch box of which the inside is provided with a sensitive switch control motor, and the inside of the high-pressure trigger is provided with an axle hole; the inside of the axle hole is provided with a rotating shaft which contacts a mandril; a gun valve is arranged below the mandril and on an opening A of a tee joint and communicated with the water outlet seat through a check valve; an opening C of the tee joint is connected with a high-pressure spray head through a high-pressure hose, a gun barrel connecting seat and a gun barrel; the high-pressure trigger is provided with a handle; and the low-pressure trigger controls a low-pressure spray head.

The invention discloses an electric tool triggered by pressure. The electric tool comprises an operation head, a motor for driving the operation head, a handle shell, a triggering switch, an intermediate component and a first elastic member. One end of the intermediate component is used for triggering the switch, the other end of the intermediate component is used for mounting the operation head and the middle of the intermediate component is used for mounting the motor. The first elastic member is used for driving the intermediate component away from the triggering switch. A gripping part is formed at the top of the handle shell. A sleeve part with one open end is formed on the handle shell. The sleeve part is used for connecting and containing the intermediate component. The triggering switch is fixed inside the handle shell. The intermediate component is slidably connected with the handle shell. The electric tool triggered by pressure is novel and ingenious in structure, accords with ergonomics more, simplifies operational actions of the triggering motor during starting, and operational actions of triggering are combined with actions allowing alignment and pressing of the operation head, and the circumstance of misalignment caused by bouncing of the electric tool due to operation of the triggering motor is reduced.

Disclosed is a balance valve of dynamic load differential pressure protection and flow pressure air chamber compensation. The balance valve of dynamic load differential pressure protection and flow pressure air chamber compensation is composed of combination of the balance valve, a two-level protection overflow valve and a pressure flow compensator. The balance valve is characterized in that a one-way valve core (6) is installed in a hole of a main valve core (5) in a sleeved mode. A right end spring cavity controlling the main valve core (5) is composed of a hydraulic control one-way valve whether is communicated with an A cavity or a B cavity. Several uniformly distributed axial direction small grooves are arranged in a large cylinder at the right end of the main valve core (5) in an opening mode. A holding cavity is communicated with the A cavity and is arranged between a main spring seat (10) and a valve body (3). The two-level overflow valve is characterized in that a throttling opening of the two-level overflow valve is the combination that a fixing throttling opening and a variable throttling opening are in series connection. The pressure flow compensator is arranged on the left cavity of an overflow valve core (14). The control principle of opening the differential pressure protection is that opening of the overflow valve core (14) is controlled by the difference value of surge pressure of the B cavity and lifting pressure of an oil cylinder. The balance valve of dynamic load differential pressure protection and flow pressure air chamber compensation is beneficial to the fact that an arm frame is returned after the surge pressure trigger by a dynamic load is released and the vibration and the swaying which are possible to emerge of the arm frame can be avoided.

A pyrotechnic training system includes a firing block assembly housed in a first container, a pressure-armed trigger module having two triggers housed in a second container, and a power pack / switch system that connects the firing block assembly and triggers. The first and second containers are remote from each other, and may be made from common objects that might be found in combat zones. Quick-release pins inserted through components of the firing block prevents their separation by exploding ordinance within the firing block, maintaining close electrical contacts within the firing block. The pressure-armed triggers employ a mechanical system that energizes an electrical circuit when pressure is released. Such triggers are arranged such that opening or moving the container triggers an explosion at the remote firing block assembly.

The invention discloses a pressure trigger type safe and intelligent charging pile. The pressure trigger type safe and intelligent charging pile comprises a main box upper cover plate, an open closing plate, a guide rail, a limiting support, a limiting motor, a limiting screw, a weighing fixed plate, a weighing movable plate and a pressure sensor, wherein a standby charging battery and a lifting motor fixing base are arranged in a main box, a console lifting motor is fixedly installed on the lifting motor fixing base, and a console lifting screw is arranged on the console lifting motor; a limiting plate is installed on the console lifting screw, the open closing plate makes contact with the guide rail, the limiting support is arranged on the right side of a telescopic frame, and the pressure sensor is arranged between the weighing movable plate and the weighing fixed plate. The application mode of the charging pile can be started by setting gravity, the situation that people damage the charging pile after charging is finished or do not operate the charging pile by rule can be prevented, the safety of the charging pile can be guaranteed, and using is convenient.

The invention relates to a self-lock type pedal for climbing a telegraph pole and a use method of the pedal. The pedal comprises a foot fixing part, a pole climbing part, a driving part, an automatic control part, a power supply and a lock device; the foot fixing part comprises a foot bottom plate, a tail plate, side plates, a toothed strap and a locking strap; the pole climbing part comprises an arc-shaped supporting plate, a telescopic arm and an arc-shaped telescopic ring; the driving part comprises a speed reduction motor, a gear and a bearing; the automatic control part comprises a pressure triggering device and limiting switches, and the limiting switches comprise a first limiting switch, a second limiting switch and a stop dog; the power supply is electrically connected with the speed reduction motor through the pressure triggering device and the limiting switches, and the lock device comprises a through hole, a circular shaft, an eccentric block and a handle. The self-lock type pedal for climbing the telegraph pole is convenient, rapid, safe, comfortable and capable of adjusting closing or opening of the pole climbing part according to a signal pressure and being fixed on the telegraph pole through the lock device.

The invention relates to the technical field of safety airbags of automobiles and discloses an inflatable gas generator capable of achieving a secondary delayed detonation. The inflatable gas generator capable of achieving the secondary delayed detonation comprises a lower shell and an upper shell. The upper shell and the lower shell are connected to form a closed explosive storage cavity. Gas generation explosives are stored in the explosive storage cavity. A starting mix pipe container is arranged on the lower shell. An ignition pipe container is arranged at the open end of the starting mix pipe container. An electric ignition pipe is arranged in the ignition pipe container. Starting mix is placed in the starting mix pipe container. A plurality of first exhaust holes are formed in the starting mix pipe container. A plurality of second exhaust holes are formed in the two sides of the upper shell. An auxiliary explosive box is arranged in the explosive storage cavity. The bottom of the auxiliary explosive box is connected with the bottom surface of the lower shell through a connecting block. A cover plate is arranged at the open end of the auxiliary explosive box. The cover plate is connected with the auxiliary explosive box in a clamped mode. Gas generation explosives are placed in the auxiliary explosive box. A pressure trigger ignition mechanism is arranged in the middle of the cover plate. The inflatable gas generator capable of achieving the secondary delayed detonation has the beneficial effects that secondary delayed detonation can be conducted, gas is continuously provided for an air bag, and smooth unfolding of an air bag module is facilitated.

The invention discloses a female-end cable connector, a male-end cable connector and cable connector components, relating to the technical field of cable technology. A portion of the male-end cable connector is inserted into the female-end cable connector. The female-end cable connector consists of a first shell, a first cable conductor and an outer semi-conducting layer, and including two clamps, a pressure triggering mechanism and a countering display. The two clamps are respectively in clamped connection with both ends of the first shell, and containing space is formed between both of the two clamps and the first cable conductor. The pressure triggering mechanism is arranged on one of the clamps, comprising a trigger end which extends to the containing space. The countering display is arranged on the exterior surface of the first shell. The countering display is connected with the pressure triggering mechanism, used for recording and displaying the triggering number of the pressure triggering mechanism. The female-end cable connector, the male-end cable connector and the cable connector components are capable of automatically recording the number of insertion and extraction of the cable connectors, wherein the cable connectors with potential security risks are replaced in time, thereby cable faults are prevented, cable lines with power outage caused by overhauls are avoided, and operation time of electrical equipment is ensured.

Disclosed are a balance valve and a differential pressure protection controlling method of a two-level protection overflow valve of the balance valve. The balance valve and the differential pressure protection controlling method of the two-level protection overflow valve of the balance valve is composed of a combination of the balance valve, a two-level protection overflow valve and a pressure flow compensator. The balance valve is characterized in that a one-way valve core (6) is installed in a hole of a main valve core (5) in a sleeved mode. A right end spring cavity controlling the main valve core (5) is composed of a hydraulic control one-way valve whether is communicated with an A cavity or a B cavity. Several uniformly distributed axial direction small grooves are arranged in a large cylinder at the right end of the main valve core (5) in an opening mode. A holding cavity is communicated with the A cavity and is arranged between a main spring seat (10) and a valve body (3). The two-level overflow valve is characterized in that a throttling opening of the two-level overflow valve is the combination that a fixing throttling opening and a variable throttling opening are in series connection. The pressure flow compensator is arranged on the left cavity of an overflow valve core (14). The control principle of opening the differential pressure protection is that opening of the overflow valve core (14) is controlled by the difference value of surge pressure of the B cavity and lifting pressure of an oil cylinder. The balance valve and differential pressure protection controlling method of two-level protection overflow valve of the balance valve are beneficial to the fact that an arm frame is returned after the surge pressure trigger by a dynamic load is released and the vibration and the swaying which are possible to emerge of the arm frame can be avoided.

A differential pressure valve has a valve body containing a main piston axially moveable therein to open a fluid inlet to a fluid outlet at preset high pressure and to close at a preset lower pressure. A high pressure trigger piston and a low pressure trigger piston are operable in the main piston to alternately engage and lock the main piston to the valve body in one of the closed and open positions. A ball shifts in a port in the main piston to alternately straddle between at least one annular locking groove in the valve body and a release recess in a respective trigger piston. The ball can shift to alternately reside to straddle the valve body and main piston in the locked position or to straddle the main piston and trigger piston in the unlocked position. The trigger pistons and main pistons are mechanically biased to urge the pistons against the fluid pressure at the inlet.

The invention relates to a high-strength double-wall inclinometer casing for inclined displacement measurement. The high-strength double-wall inclinometer casing comprises a plurality of measuring pipe fittings, a plurality of pipe fitting connecting pieces and an axial pressure trigger self-opening type anchor hook base. The measuring pipe fittings are connected through the pipe fitting connecting pieces, the axial pressure trigger self-opening type anchor hook base is connected with the measuring pipe fitting which firstly conducts hole sinking, the measuring pipe fittings are provided with inner walls and outer walls, four concrete filling cavities of inner and outer pair arc structures are formed by the inner walls and the outer walls, a plurality of holes are formed in the outer walls, when the inclinometer casing is submerged in the bottom of drilled holes, pressure is exerted in the axial direction, the axial pressure trigger self-opening type anchor hook base is opened and is anchored to the pedestal rock, and when back filling is carried out on concrete, cement paste enters the concrete filling cavities through the holes. The inclinometer casing has the strong capability of resisting tension and pressure, resisting bending and resisting torsion, the compatible deformation capability of the inclinometer casing and the surrounding rock-soil layer is improved, the upward buoyancy of serous fluid on the inclinometer casing is reduced, and a base of the inclinometer casing and the bed rock are in the fixed connection state all the time.

The invention relates to a pressure-triggered switch type accelerator pedal system for preventing an accelerator from being used as a brake, which belongs to an accelerator system capable of directly acquiring a false accelerator stepping signal. A pressure-triggered switch is arranged on the front or back of an accelerator pedal or on a body part corresponding to the accelerator pedal, and the pressure-triggered switch is a switch which enables two conductive contacts to be in contact with each other to conduct electricity after an elastic element in the switch is deformed by switch threshold pressure, the position where the pressure-triggered switch is arranged ensures that a switch threshold corresponds to a false stepping threshold, and the pressure-triggered switch is connected with a trigger signal converter. The pressure-triggered switch type accelerator pedal system has the advantages that: the pressure-triggered switch type accelerator pedal system can directly acquire the false accelerator stepping signal, and does not need a pressure sensor with a microelectronic circuit to analyze accelerator stepping acts with different weights to find out false accelerator stepping acts, the response of the system is quick, the structure is simple, the cost is low, the size is small, and the system is easy to mount, and is a highly-reliable accelerator system which can directly acquire the false accelerator stepping signal.

The invention provides a ventilation trigger method and a ventilation trigger device used for an anaesthesia machine. The method comprises the following steps of: providing an interface, wherein the interface comprises options of a plurality of trigger modes; receiving an option selected by a user through the interface; and performing ventilation trigger on the anaesthesia machine by taking a trigger mode corresponding to the option as a current trigger mode of the anaesthesia machine. The method and the device achieve the technical effect that a patient is easier to recover by selecting flow rate trigger or pressure trigger according to the state of the patient when the anaesthesia machine performs the ventilation in the trigger mode.

The invention relates to a firecracker which comprises a shell, a dynamite-free fuel unit and a connector unit. The connector unit is used for applying voltage to the dynamite-free fuel unit. The dynamite-free fuel unit can generate expansion gas after the preset voltage is applied to the dynamite-free fuel unit, so that expanding pressure triggering explosion is formed. According to the firecracker, the preset voltage needs to be applied to the firecracker, then explosion happens, in comparison with a firecracker with dynamite in the prior art, on one hand, storing and transporting are facilitated, the firecracker is not influenced easily by outside environment, and the potential safety hazard is small; on the other hand, the fuel unit is a dynamite-free unit, after explosion, emission ofa large quantity of gas such as sulfur dioxide and sulfur monoxide is avoided, and environmental pollution is avoided. Explosion only occurs after the voltage needs to applied to each firecracker, the chain reaction does not occur easily, energy generated by explosion is controllable relatively, and the potential safety hazard can be further reduced. The invention further provides a firecracker structure.

The invention relates to a foot shackle for telegraph pole climbing and a using method thereof. The foot shackle comprises a foot fixing part, a pole climbing part arranged in front of one side of the foot fixing part and a driving part arranged at the end of the pole climbing part and further comprises an automatic control part and a power supply. The foot fixing part comprises a foot base plate, a tail plate and side plates, and the left side plate and the right side plate are respectively provided with a toothed belt and a locking belt. The pole climbing part comprises an arc-shaped supporting plate, a supporting arm, an arc-shaped telescopic ring and rubber strips. The driving part comprises a speed reducer, a gear and a bearing. The automatic control part comprises a pressure triggering device and limiting switches. Contacts of the limiting switches are installed in arc-shaped sliding ways by means of through holes, and the limiting switches include the first limiting switch and the second limiting switch. The power supply is electrically connected with the speed reducer through the pressure triggering device and the limiting switches. The foot fixing part is quick and convenient to wear, safe and comfortable. The foot shackle can also adjust closing or resetting of the pole climbing part according to a pressure signal.

The invention discloses a pressure trigger type underwater cast-in-place pile elevation locating device and a using method thereof. The pressure trigger type underwater cast-in-place pile elevation locating device comprises an underwater pressure probe, an alarm device and two waterproof wires, wherein the underwater pressure probe is connected with the alarm device in series through the two waterproof wires. The underwater pressure probe comprises a probe protection cover and a pressure sheet fixing bar which is arranged in the probe protection cover. Multiple pairs of outer pressure sheets and inner pressure sheets are fixed on the pressure sheet fixing bar, the outer pressure sheets correspond to the inner pressure sheets in position, and the outer pressure sheets are spaced from the inner pressure sheets by a certain distance internally and externally. The pairs of the outer pressure sheets and the inner pressure sheets are arranged in the radial direction of the underwater probe in an equal-angle mode. The outer pressure sheets and the inner pressure sheets are connected with the two waterproof wires respectively. The underwater pressure probe is placed at the pile foundation designed elevation position; when concrete rises to the designed elevation position, the concrete applies pressure to the periphery of the underwater pressure probe, so that the outer pressure sheets and the inner pressure sheets which are not closed originally are closed by bearing the pressure, a circuit is closed, and the alarm device connected with the circuit in series is excited by currents to work so as to give an alarm.

The invention discloses an alarm device for a mobile electric vehicle charging pile. The alarm device comprises a base, wherein the lower end of the base is provided with a connection shaft; a line concentration wheel is fixed on the outer wall of the connection shaft; a driving gear is fixed on the left end of the connection shaft; a driven shaft is arranged at the left part of the driving gear; a driven gear is fixed at the right end of the driven shaft; an elastic locating piece is fixed at the left end of the driven gear; a draw ring is fixed at the left end of the driven shaft; a dialing piece is fixed at the right end of the connection shaft; a buzzer is arranged at the lower end of the base; and a pressure trigger switch is arranged at the left end of the buzzer. The alarm device for a mobile electric vehicle charging pile has the advantages of being compact in structural design and low in manufacturing cost, and can realize the alarm function through coordination of the buzzer and the pressure trigger switch so that the manufacturing cost is saved, and at the same time can realize the self-locking function of the device through coordination of the driven gear and the driving gear to prevent unexceptional working of the device so that the reliability of the device is improved.

A pressure trigger switch-type accelerator pedal system used to correct mistaken use of an accelerator for braking, classed as an accelerator system able directly to obtain a signal indicating that the accelerator has been pressed incorrectly. A pressure trigger switch (1) is provided on the front surface or rear surface of the accelerator pedal (16), or alternatively, a pressure trigger switch (1) is provided at the part of the car bodywork (21) corresponding to the accelerator pedal (16); when a spring element in the pressure trigger switch is deformed by pressure at the switching threshold, two conducting contact elements of the switch are brought into contact, generating a switch that is switched on so that it conducts electricity; the position in which the pressure trigger switch (1) is disposed enables the switching threshold to correspond to the threshold for incorrect accelerator-pedal use; the pressure trigger switch (1) is connected to a trigger signal converter (35). The present accelerator pedal system is able directly to obtain a signal indicating that the accelerator has been pressed incorrectly, and there is no need to use a pressure sensor with a microelectronic circuit to analyse actions of accelerator-pressing at different pressures to determine whether the accelerator has been pressed incorrectly; the system has a fast response speed, simple structure, low cost and small volume; the system is easy to install, and is a reliable system for obtaining a signal indicating incorrect pressing of an accelerator.