93 results about "Pressure decrease" patented technology

The disclosure relates to a leak detection system for a pneumatic braking system of a vehicle. The pneumatic braking system has a control unit, a pneumatic circuit, and an air tank configured to supply pneumatic pressure to the pneumatic circuit. The pneumatic circuit has a plurality of valves configured to be individually controlled by the control unit. The link detection system includes program code configured, when executed by a processor, to individually control the valves of the pneumatic circuit so as to isolate a sub-circuit of the pneumatic circuit. The leak detection module is configured to monitor a pressure in the pneumatic circuit for leaks, wherein the leak detection module detects a leak in the sub-circuit if the pressure decreases while the sub-circuit is isolated.

An air pressure management device includes: a temperature conversion air pressure calculation unit that calculates a temperature conversion air pressure based on acquired temperature and air pressure of a tire; an air pressure decrease rate calculation unit that calculates an air pressure decrease rate from a change in the temperature conversion air pressure for a predetermined period, the rate indicating a declining trend of the air pressure; an air pressure decrease rate threshold value setting unit that sets an air pressure decrease rate threshold value corresponding to an acquired thermal history amount using a threshold value table, the threshold value table specifying the air pressure decrease rate threshold value associated with the thermal history amount regarding the tire; and a first determination unit that determines whether the air pressure is abnormal based on the calculated air pressure decrease rate and the set air pressure decrease rate threshold value.

A grapple hydraulic cylinder may comprise a barrel body, a piston-rod assembly, a cap operably connected to the barrel body, and a pressure relief system. The pressure relief system may be operably connected to a rod side chamber and a cap side chamber. The pressure relief system may comprise a first valve and a second valve. The second valve may be a relief valve configured to open upon the cap side chamber reaching a determined pressure and moving hydraulic fluid from the cap side chamber to the rod side chamber while the first valve simultaneously maintains the locked position. Pressure in the cap side chamber is reduced, and pressure in the rod side chamber increases. A similar configuration may be utilized to move hydraulic fluid from the rod side chamber to the cap side chamber to reduce pressure in the rod side chamber.

A valve device for a self-propelled work machine (1) having hydraulic consumers (47, 50), the valve device comprising at least one direction control valve (30, 31, 55, 64) connected to the pressure lines (P1, P2, 56, 65) and the work lines (A1, A2, 52, 54) of the hydraulic consumers (47, 50); a hydraulic control line (C, 58, 63) designed to move at least one direction control valve (30, 31, 55, 64) to a first position; a pilot valve (32, 59) connected to the hydraulic control line (C, 58, 63); a pressure supply line (Pa, 66); and a pressure reduction line (T, 62), the pilot valve (32, 59) being designed to selectively connect the hydraulic control line (C, 58, 63) to the pressure supply line (Pa, 66) and the pressure reduction line (T, 62).

The application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reducing cavity between the first valve body and the second valve body; an air outlet on the second valve body; a guide in the pressure reducing cavity; a valve core through the guide; a first elastic member with a spring seat between the bottom of the valve core; an adjusting mechanism on the top of the second valve body, suitable for adjusting the limit stroke of the valve core; a plurality of pressure reducing channels on the surface of the valve core; the pressure reducing channels comprise N pressure reducing grooves connected in a head-to-tail manner, the two connected pressure reducing grooves are arranged in an inclined manner, the first pressure reducing groove to the Nth pressure reducing groove, and the width and depth of the pressure reducing grooves gradually increase; the pressure reducing channels are used for reducing the pressure of hydrogen, and the pressure of high-pressure hydrogen can be reduced to the use range by using a one-stage pressure reducing structure, the structure is simple and compact, small in size, light in weight, and good in reliability.

The invention relates to a method for controlling a tank system (100). The tank system (100) has a plurality of tanks (12) and a line system (39). Each tank (12) is provided with a valve (13) and a temperature sensor (16). The tank system supplies at least one load (40) with a fluid. The method has the following steps: a) detecting a missing expected pressure decrease by means of the line system (39) when all of the valves (13) of all of the tanks (12) of the plurality of tanks are closed, b) detecting the temperature in each tank (12) over a defined period of time, and c) ascertaining a temperature curve for each tank (12) on the basis of the detected temperature and opening all of the valves (13) of all of the tanks (12) on the basis of the ascertained temperature curves. During steps a) and b), the at least one load is supplied from at least one tank (12.1) which remains open.

A manufacturing apparatus includes a chamber, a pressure reducing device, and a return pipe. The pressure reducing device is configured to reduce the pressure in the chamber. The return pipe includes a first opening, a conduit, and a second opening. The first opening and the second opening are respectively and independently open to the interior of the chamber. The first opening is connected to an exterior body. The conduit connects the first opening and the second opening. The conduit is configured to once draw gas in the exterior body out of the chamber when the pressure in the chamber is reduced, and return the drawn gas into the chamber.

The utility model relates to a pressure reducing valve device with a waterproof function, which comprises a valve body, an oxygen bottle connector is arranged at the opening end of the valve body, a connecting part is arranged between the oxygen bottle connector and the valve body, and the valve body and the oxygen bottle connector are fixedly connected through the connecting part. When the pressure of oxygen in an external oxygen bottle is reduced, the pressure in the oxygen bottle connector is reduced, at the moment, the spring pushes the valve element to move towards the oxygen bottle connector, the bottom end of the air hole is driven to move synchronously, and when the bottom end of the air hole moves to be communicated with the alarm pipeline, the water-proof sealing structure is closed. Therefore, gas can be discharged into the alarm pipeline through the air hole, penetrates through the one-way valve and then is discharged from the bottom end of the alarm pipeline, bubbles are formed underwater, a user is reminded of insufficient oxygen pressure, and the problem that the underwater welding quality can be seriously affected due to the fact that the oxygen pressure is insufficient and a welding rod cannot be fully combusted is avoided as much as possible.

This technology provides a way to determine the state of air control valves and flow paths used in vehicle brakes without requiring any special operation. [Solution] The state determination device 100 is a state determination device 100 that determines the state of at least one of an air control valve and a flow path used in a vehicle brake, and the air control valve includes an acquisition unit 110 that discharges air at an output pressure corresponding to the input pressure, which is the pressure of the introduced air, into a supply flow path to the brake cylinder, acquires first measured values ​​of the input pressure and output pressure at one or more timings during the pressure-increasing period when the input pressure increases, and acquires second measured values ​​of the input pressure and output pressure at one or more timings during the pressure-reducing period when the input pressure decreases, a calculation unit 120 that calculates the difference between at least one of the input pressure and output pressure during the pressure-increasing period and the pressure-reducing period based on the first measured value and the second measured value, and a determination unit that determines the state of at least one of the air control valve and the flow path according to the difference.

The utility model provides fatigue test equipment, which belongs to the technical field of carrier rockets and comprises a storage tank, a pneumatic system and a water replenishing system. The pneumatic system communicates with the gas inlet and outlet through the proportional valve; the water replenishing system communicates with the liquid inlet and outlet; when the fatigue test equipment is used, liquid in the storage tank is pushed by the pneumatic system to enter the storage tank test piece, the fatigue test is carried out on the storage tank test piece under the action of the pneumatic system, the principle that water is pushed by air is adopted, and the fatigue test equipment is not influenced by the service life of a pressure reducing valve and a back pressure valve; the pressing precision, the pressure increasing rate and the pressure reducing rate can be better controlled in 20,000 times of pressure cycle fatigue tests; in the pneumatic system, the proportional valve is communicated with the storage tank, and the proportional valve has the characteristics of stepless adjustment of pressure and speed, low service power, less heat and low noise, so that impact fluctuation during reversing of a conventional switch type pneumatic control valve can be avoided, and pressure control is more direct and accurate.

To improve the environmental performance of a Wankel-type internal combustion engine and improve rotation performance.SOLUTION: A rotational force is obtained by using pressure when combustion pressure is maximum, so that the combustion pressure can be received as strongly as possible in a desired direction. The pressure decreases as a combustion chamber volume increases, and the pressure decreases as a temperature decreases. Thus, in a Wankel-type internal combustion engine, a large area of a plane for receiving the combustion pressure in a normal rotation direction is achieved, and other faces are served as faces concentric about a rotor center which do not hinder the rotation. When the vicinity of an apex of a face facing a reverse rotation direction which hinders the rotation is hidden behind a rotor housing, a value of receiving the combustion pressure in the normal rotation direction becomes maximum, at which ignition is performed. Since fuel injection timing is set slightly before the ignition for the purpose of not generating HC, there is no time for mixing as a mixed gas, which allows a combustion under the presence of spots. Also, since the fuel is injected in a small volume, the ignition is facilitated even under a significant lean state.SELECTED DRAWING: Figure 1

The invention relates to a pressure maintaining experiment method and system for detecting leakage of a soot blowing system. The method comprises the following steps that S1, a soot blowing steam electric isolation door, an inlet door and a drainage door are opened; s2, the system control valve pressure is set to be a first preset pressure value, drainage operation is carried out, and a first time period is timed; s3, after timing is finished, the control valve pressure of the system is reduced to a second preset pressure value, and after a second time period is delayed, the water blowing and draining valve is closed; s4, closing the isolation door, completely closing the override of the control valve of the system, carrying out a pressure maintaining test, and timing for a third time period; s5, monitoring the pressure change in the system in real time, and determining the final pressure value of the system; s6, judging the state of the system according to the pressure change data in the system; when the final pressure value is larger than the preset pressure threshold value, the system does not leak; if the final pressure value is reduced to 0, the system breaks down. Compared with the prior art, the method has the advantages of timely detection, high reliability and the like.

A method for determining properties of hydraulic fractures from measurements of pressure in a well made after stopping pumping fracturing fluid into the well (shut in) includes determining a first time after shut in whereinafter a decrease in measured pressure is caused by fluid leak off in a fracture. A second time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth and fluid pressure equilibration in the fracture. A third time after shut in is determined whereinafter the decrease in pressure is caused by fluid leak off, fracture growth, fluid pressure equilibration in the fracture and pressure drop in a near wellbore zone. Values of fluid efficiency, minimum stress and net pressure which are determined result in a calculated pressure with respect to time matching the pressure measurements within a predetermined threshold.

An alert system for use with a subsea infrastructure is presented. The alert system 400 includes a pressure detection apparatus 410 connectable to the subsea infrastructure 405; a signalling device; and a release mechanism 420 operable between a locked state in which the signalling device is attached to the alert system, and an unlocked state in which the signalling device is released from the alert system. The alert system 400 releases the signalling device upon detection of a pressure variation at a point of interest on the subsea infrastructure above a first threshold value when the pressure variation is due to an increase in pressure, or below a second threshold value when the pressure variation is due to a decrease in pressure. Also presented is a method of monitoring a subsea infrastructure using the alert system.

An interface bonding failure test method, system, storage medium and program product, relate to the field of testing or analyzing materials by means of determining chemical or physical properties of materials, in the method, the interface bonding state between the pole piece coating and the current collector is evaluated by performing a single loading and unloading cycle. In the loading stage, a first resistance value is measured when the pressure reaches a preset target detection pressure, and then the pressure is continuously increased to a preset peak pressure (the pressure is greater than the target detection pressure but less than the yield strength of the current collector). In the unloading stage, a second resistance value is measured when the pressure decreases back to the preset target detection pressure. By comparing the difference between the two resistance values with a preset hysteresis threshold, the interface bonding state is determined: if the difference is greater than the threshold, it is determined that there is interface bonding failure. The present application is used to reduce the difficulty of identifying overpressure risk and defining the best roll pressure process window.

A device for supplying respiratory gas, which has a respiratory gas supply driven by an electric motor and a motor control system comprising at least one sensor for detecting a measured value, wherein the motor control system (14) has a control characteristic for reducing a current target speed of the electric motor (13) as a function of the measurement signal of the sensor when a predeterminable limit value of an operating parameter is exceeded, characterized in that the motor control system (14) has a control characteristic for reducing the speed as a function of the measured value while simultaneously maintaining a limit value for a further operating parameter, wherein the control characteristic is designed to maintain a minimum value for a ventilation pressure, wherein the motor control system (14) is designed to evaluate at least one detected breathing event,wherein the motor control regulates the mean pressure level in the time range of a user's expiration to at least 2 hPa by means of a control device, and wherein the pressure level in the time range of an expiration is variable independently of a user's specification, and wherein a user can specify the extent of the change in the pressure level for the time range of an expiration, wherein the breathing events are oral expiration and leakage, and wherein, upon automatic detection of these events, the pressure control takes into account those metrological parameters which are evaluated by the control in a normal state for a pressure increase or a pressure decrease and which can no longer be reliably evaluated when these events occur, for the duration of the occurrence of these events,that the operating mode reducing noise and / or energy consumption and / or respiratory effort is activated, with a pressure reduction occurring upon detection of these events.

A leak control system (26) for an evacuation system (12) of an insufflation system (1), for controlling leakage of insufflating gas from a vessel (5) of a subject being insufflated. An evacuation conduit (20) connects a Venturi vacuum creating device (14) to the vessel (5) through a pressure relief valve (27) operable from a closed state to an open state in response to a pressure drop across the pressure relief valve (27) in the direction of the arrow A exceeding a predefined pressure drop value. The vacuum creating device (14) is operable in response to a signal from a pressure sensor (10) detecting pressure in the cavity (5) exceeding a predefined pressure value for applying a vacuum to the evacuating conduit (20) to increase the pressure drop across the pressure relief valve (27) to the predefined pressure drop value, for in turn operating the pressure relief valve (27) into the open state. On the pressure in the vessel (5) being reduced below the predefined pressure value, the vacuum creating device (14) is deactivated, and the pressure relief valve (27) transitions into the closed state, thereby preventing further leakage of insufflating gas though the Venturi vacuum creating device (14).

The invention provides a steady-flow multistage pressure reducing valve, and relates to the technical field of pressure reducing valves, the steady-flow multistage pressure reducing valve comprises a multistage curved pipeline system, the multistage curved pipeline system is composed of annularly distributed inlets and outlets, each stage of curved pipeline is communicated in a valve body, and the inlets and the outlets are distributed at intervals; a bend at the tail end of the main runner and the inner wall of the branch runner form a reverse impact structure which is used for reducing fluid pressure; according to a fixed type design without movable parts, pressure adjustment is achieved through the hydrodynamic principle, mechanical driving elements are not needed, geometrical parameters of the curved pipeline include that the ratio of the main runner length (# imgabs0 #) to the branch runner length (# imgabs1 #) is 2: 1 to 5: 1, and fluid pressure can be greatly adjusted while fluid circulation is kept. The fluid energy loss in the pressure reducing process is reduced, and the pressure reducing accuracy of the pressure reducing valve is improved. The number of movable parts of equipment is small, mechanical abrasion and maintenance requirements are reduced, and the reliability and durability of the valve are improved.

The invention discloses a full-premixing gas water heating equipment control method and device, equipment and a medium. When the current rotating speed of a fan reaches the maximum rotating speed of the fan and flame ion flow is smaller than or equal to a current threshold value, the pressure difference between the air pressure of a premixer and the gas pressure of the premixer is reduced, and a corrected pressure difference value is obtained; the opening degree of the gas proportional valve is adjusted, so that the pressure difference value between the air pressure and the gas pressure is equal to the corrected pressure difference value, and due to the fact that the corrected pressure difference value is smaller than the pressure difference value obtained through calculation based on the current rotating speed of the draught fan, when the air pressure is reduced, the pressure difference value is also reduced, and the gas pressure needing to be reduced is reduced; the reduction range of the opening degree of the gas proportional valve is reduced, the problem that smoke exceeds the standard or flames out due to excessive reduction of the opening degree of the gas proportional valve is avoided, and the environment-friendly performance and the operation stability of the full-premixing gas water heating equipment are improved.

A partition wall for dividing an aircraft cabin into individual sections, having at least one opaque air passage for enabling a pressure reduction between the sections through the partition wall. The wall also includes a frame and at least one stress-free planar element which is inserted into the frame. The at least one air passage is formed by a structure, a suspension in the frame, or both.

The invention relates to a method for controlling the valve (60) of a pressure relief valve (50) of a fluid device (10) of a vehicle, comprising the steps of providing (62) the pressure relief valve (50), which is configured to trigger a pressure reduction of the fluid in at least one fluid branch (42, 44) of the fluid device (10) when the valve is in the open position, the pressure reduction of which depends on an opening time of the pressure relief valve (50), and performing (64) a pressure reduction process (66) to reduce the fluid pressure (p) in the fluid branch, with a first pressure reduction step (68) comprising opening (70) the pressure relief valve (50) with a predetermined first opening time (t1), wherein during the pressure reduction process (66) and subsequently after the first pressure reduction step (68), the fluid pressure (p) in the fluid branch (42) reduced by the pressure reduction of the first pressure reduction step (68) is detected (72). 44),A comparison (76) of the detected fluid pressure (p) with a target fluid pressure (ps) and a specification (78) of a second opening time (80) to be applied for a subsequent second pressure reduction step (80) when the pressure relief valve (50) is opened, depending on the comparison (76), are performed. The invention further relates to a method for pressure reduction (84), a pressure relief valve (50), and a fluid device (10).

The invention relates to the technical field of check valves, and discloses a check hydraulic valve which comprises a valve body. A water inlet and a water outlet are formed in the left side and the right side of the valve body correspondingly, a positioning groove is formed in the valve body, a valve element is slidably connected to the interior of the valve body, a positioning strip is fixedly connected to the exterior of the valve element, the positioning strip is slidably connected with the positioning groove, a weight reduction groove and a through groove are formed in the upper portion and the lower portion of the valve element correspondingly, and a pressure relief mechanism is arranged in the through groove. When the pressure rises, the pressure relief channel is automatically opened; after the pressure is reduced, the valve can automatically reset to close a channel, so that stable operation of a system is ensured, the automation degree and stability of the system are greatly improved, serious accidents such as pipeline breakage and equipment damage caused by too high pressure in the valve body are effectively avoided, and reliable guarantee is provided for safe and stable operation of the whole water conservancy system; the safety risk and the maintenance cost are reduced, and the reliability and the service life of the valve body are improved.

The utility model relates to the technical field of clamps, in particular to a pressure reduction clamp. Comprising two clamp bodies, fixing parts which can be fixedly connected through a fixing mechanism are fixedly installed at the two ends of each clamp body, and sealing rings are installed on the inner sides of the clamp bodies. A pressure reducing plate is fixedly installed on the inner side of the sealing ring, and a pressure reducing hole is formed in the middle of the pressure reducing plate. By means of the structure, when liquid in the pipeline flows through the pressure reducing holes, a channel becomes smaller, so that the flow is reduced when the liquid flows into the middle transition pipeline, the pressure in the transition pipeline is reduced, then the liquid flows into the pipeline with the small pipe diameter from the transition pipeline, the pressure in the pipeline with the small pipe diameter is reduced, and the pressure in the pipeline with the small pipe diameter is reduced. And the overall stability of the pipeline is improved.

This invention relates to a drive system for a vehicle, the vehicle being at least partially powered by hydrogen (H2), the drive system comprising: a storage tank (1) for liquid hydrogen (H2) having a tank heating device (6); and an operation and consumption prediction module (10) configured to determine the amount of hydrogen (H2) required to reach a driving destination. vor ); and a control unit (12) for the tank heating device (6). The drive system of the present invention is characterized by having a pressure prediction module (11) configured to determine the desired target pressure (p) in the tank (1) to be reached upon arrival at the destination. End The required amount of hydrogen (H2) consumed (consumption) ges ), wherein the control unit (12) is configured to input the demand (consumption) vor ) and consumption (consumption) ges The two are compared with each other, and the consumption (consumption) is recorded. ges ) is greater than or equal to the demand (consumption) vor In the event of a shortage of water, the tank heating device is shut down (6), while the demand (consumption) is reduced. vor ) greater than the consumption (consumption) ges In the event of [a situation where] the tank heating device (6) is activated. Furthermore, the present invention relates to a method for controlling the consumption (consumption) in a pressure prediction module (11). ges This method performs model-based calculations. The drive system can be applied to vehicles.

The invention relates to a regulator (2) for compressed gas comprising: a body (4) having a gas inlet (6), a gas outlet (8) and a gas passage (10) fluidly interconnecting the gas inlet (6) and the gas outlet (8); a pressure reducer (14) having a shut-off device and a movable component in the gas passage (10), the movable component being operatively connected to the shut-off device and defining, together with the body (4), a regulation chamber (14.6) downstream of the shut-off device; a pressure relief device (16) in the gas passage (10) downstream of the regulation chamber (14.6); and a flow restrictor (22) in the gas passage (10) upstream of the shut-off device, the flow restrictor (22) being sized to reduce the gas pressure at the gas outlet (8) below a maximum pressure value when the pressure relief device (16) is open and the shut-off device is open.

The invention provides a work machine with improved convenience. An air compressor (10) is provided with a tank section (20), a compression section (40), and a control section (100). The tank part (20) stores compressed air. The compression unit (40) delivers compressed air to the tank unit (20). The control unit (100) includes a pressure sensor (108) that detects the pressure inside the tank unit (20). The control unit (100) is capable of executing a compression unit diagnostic control for diagnosing whether or not maintenance of the compression unit (40) is necessary on the basis of the driving time of the compression unit (40) and the pressure of the tank unit (20), and a tank unit diagnostic control for diagnosing whether or not maintenance of the compression unit (40) is necessary. The tank diagnosis control diagnoses whether or not maintenance of the tank (20) is necessary on the basis of the elapsed time from the point in time at which driving of the compression unit (40) is stopped and the amount of pressure reduction of the tank (20).

The invention relates to a brake system, comprising at least two wheel brake cylinders (RZ1-4), at least one electrically driven pressure supply (DV), at least one liquid storage tank (VB), at least one electronically controlled regulating device (ECU), at least two switching valves (SVi = 1-4), each of the at least two wheel brake cylinders (RZ1-4) is part of a separate wheel circuit (RK1-4), and the electrically driven pressure supply (DV) is at least used for establishing a pressure increase (Pauf) and a pressure decrease (Pab) in the wheel brake cylinders (RZ1-4), each wheel brake cylinder (RZ1-4) being connected to a switching valve (SVi = 1-4) via a respective hydraulic connection line. The switching valve (SVi = 1-4) is used for disconnecting and connecting the hydraulic connection of the corresponding wheel brake cylinder (RZ1-4) to at least one further hydraulic main line, the switching valve (SVi = 1-4) is connected or can be connected to at least the pressure supply (DV) via the at least one further hydraulic main line, and the switching valve (SVi = 1-4) is a normally open two-position two-way valve, according to the invention, at least the hydraulic connection line (HLRK1-4) and the wheel brake cylinder (RZ1-4) connected to the hydraulic connection line (HLRK1-4) are parts of a wheel circuit (RK1-4), and at least one switching valve (SVi = 1-4) or all switching valves (SVi = 1-4) do not have a check valve or do not have a check valve connected in parallel with the switching valve (SVi = 1-4), providing various measures alone or in combination, the switching valve (SVi = 1-4) is prevented from being closed when the pressure (Pab) is reduced through the switching valve (SVi = 1-4).

[Problem] To provide a lift generating device for an aircraft and a thrust generating device for an aircraft that are capable of generating lift and thrust, respectively, using dynamic pressure which is generated when a disc member is rotated. [Solution] A lift generating device (10) for an aircraft comprises: a circular or annular disc member (11); a rotational drive mechanism (12) that rotationally drives a disc member (11); a lift generating mechanism (13) that generates lift (F) with dynamic pressure which is generated in the vicinity of an upper surface of the disc member (11) when the disc member (11) is rotationally driven; an annular pressure reduction chamber (14) that is formed by the disc member (11) and a disc body (6) in a region in the vicinity of a lower surface of the disc member (11); a plurality of sealing means (15A, 15B) that seal the pressure reduction chamber (14) such that air does not enter therein; a vacuum pump (16) that is capable of reducing the pressure inside the pressure reduction chamber (14) to a preset reduced-pressure state; and a plurality of thrust bearing means (17) that are provided inside the pressure reduction chamber (14) and between the disc member (11) and the disc body (6).

The invention relates to the technical field of lightning sweeping channel attachment tests, and discloses a pneumatic positioning and synchronous adjusting lightning sweeping channel test device which comprises an experiment platform, a supporting mechanism is arranged in the middle of the top of the experiment platform, and a test piece is supported on the top of the supporting mechanism. A piston mechanism communicated with the supporting mechanism is arranged in the middle of the bottom of the experimental platform; according to the thunder and lightning sweeping channel test equipment, the supporting plate is arranged to support the test piece, so that the supporting plate moves downwards under the action of the gravity of the test piece, air pressures of upper and lower groups of areas in the piston bin are changed, the air pressure space of the area at the top in the piston bin is increased, and the air pressure is reduced; and meanwhile, the bottom air pressure space in the piston bin is reduced, and the air pressure is increased, so that the first piston plate is extruded to drive the limiting convex block to displace to position the displacement seat, and the functions of automatic positioning and clamping are completed.