28results about How to "Open and close quickly" patented technology

The split type tail door control system comprises a first vehicle door and a second vehicle door which are movably arranged between the door opening position and the door closing position of a vehicle body in a hinged mode. And the first control unit identifies the second door lock related signal, and the identification point is a certain calibration position point in the first vehicle door moving track. The invention further discloses an automobile. A certain calibration position point in the running track of the first vehicle door is ingeniously set as the recognition point, and when the first vehicle door runs to the position of the recognition point, the first control unit and the second control unit do not need to share and interact the position information of the first vehicle door and the second vehicle door; and the first control unit controls the first vehicle door to perform corresponding opening and closing or parking actions according to the signal feedback of the second door lock, so that the opening and closing operations of the first vehicle door and the second vehicle door under normal and abnormal conditions are realized to ensure that the second vehicle door and the first vehicle door are quickly closed in place, and the operation is simple and convenient.

The invention discloses an emptying valve device in a control system, belongs to the field of air blowers, and overcomes the defects that an old-fashioned pneumatic switch type electromagnetic valve is easy to age and unreliable. The emptying valve device in the automatic control system is installed on a branch ventilation pipeline communicated with the side face of an air blower outlet pipeline and matched with a pressure detection device on an air outlet pipeline of an air blower main machine in a control system of air blower equipment, and the automatic control effect is achieved; an emptying valve device in the automatic control system comprises a support for installing spare parts, a butterfly valve is installed on the support, and a butterfly valve control mechanism for opening the butterfly valve to release pressure according to signals of a pressure detection device is further installed. The butterfly valve is coaxially connected with the branch ventilation pipeline through a flange, and the ventilation state of the branch ventilation pipeline depends on the state of the butterfly valve. The pressure relief valve is suitable for all occasions needing pressure relief.

The utility model belongs to the technical field of sighting telescope machining, and particularly relates to a sighting telescope machining positioning tool which comprises a supporting frame, a heat dissipation box is fixedly installed in the middle of the supporting frame, a first motor is fixedly installed at the bottom of an inner cavity of the heat dissipation box, and fan blades are movably installed on the top of the first motor. A filter disc is fixedly mounted on the surface of the heat dissipation box; through the arrangement of the supporting frame, the whole device can be conveniently lifted to a certain height so as to facilitate subsequent machining, through the arrangement of the heat dissipation box, the machined sighting telescope component can be conveniently cooled in time, so that the machining speed of the component is increased, the machining efficiency is improved, through the arrangement of the first motor, fan blades are conveniently driven to rotate, and the machining efficiency is improved. Through the arrangement of the filter disc, the situation that pollutants enter the heat dissipation box, and consequently the rotation quality of the fan blades is affected can be reduced.

The utility model discloses an anti-loosening protective cover for a top cover bolt of a gasification furnace, which relates to the field of gasification furnaces, comprises an outer protective shell, an end head, a connecting part and a pressing part, and is characterized in that the outer protective shell is sleeved on the outer side of the bolt and is fixedly connected to the top of a top cover; the end cover is arranged at an opening in the top of the outer protective shell, and the connecting part is used for connecting the end cover and the outer protective shell, so that the end cover is detachably mounted at the top end of the outer protective shell. Therefore, looseness of the bolt caused by stress relaxation and mechanical vibration is effectively restrained, sealing connection between the gasification furnace top cover and the combustion chamber is guaranteed, medium leakage is prevented, the bolt is completely sealed through the outer protective shell and the end cover, erosion of high-temperature corrosion or dust environment to the surface of the bolt is isolated, the service life of the bolt is prolonged, and the service life of the gasification furnace is prolonged. The loosening risk is reduced, and the safety and the stability of the gasification furnace are improved.

The invention discloses a rotary water-leakage-proof aluminum alloy door and window, and relates to the technical field of aluminum alloy doors and windows, in particular to a rotary water-leakage-proof aluminum alloy door and window which comprises a wall body, a servo motor is fixedly installed on the right side of the front face of the wall body, and a first driving wheel is fixedly installed on an output shaft of the servo motor. According to the rotary water-leakage-proof aluminum alloy door and window, a first driving wheel can be driven to rotate by starting a servo motor, a first crawler belt can be driven through rotation of the first driving wheel, so that a first driven wheel rotates, then a rotating shaft can be driven, and a second driving wheel rotates; a second driving wheel rotates to drive a second caterpillar band so that a third driving wheel can rotate, the second caterpillar band can drive a first driving block and a supporting keel at the same time, the sunshade curtain can be rapidly opened, closed and folded, and meanwhile the noise trouble caused by a traditional sunshade curtain driving chain is avoided.

The utility model discloses a refrigeration house lifting door which comprises a vertical frame and a furling assembly which are fixed to the two sides of a door frame. The vertical frames are fixedly connected with guide rails, and a heat insulation door is slidably connected between the two guide rails. The rotating rod is rotationally installed at the upper end of the vertical frame, the winding wheel is coaxially fixed to the surface of the rotating rod, a steel wire rope is wound around the surface of the winding wheel, and the free end of the steel wire rope is connected with the lower end of the heat insulation door; anti-falling mechanisms used for preventing falling out of control are installed at the connecting positions of the two sides of the heat insulation door and the guide rails. The motor drives the rotating rod to rotate, the rotating rod rotates to drive the winding wheel to rotate to wind the steel wire rope, and the free end of the steel wire rope pulls the heat insulation door to ascend. The heat insulation door does not need to be rolled up after rising, the shape change is small, abrasion to a heat insulation door connecting part is low, no extra space is occupied, the service life of equipment is prolonged, the maintenance cost is reduced, and the use efficiency is improved.

The utility model relates to the technical field of aging bins, in particular to an agricultural waste aging bin. Comprising a tank body, the top of the tank body is fixed and communicated with a feeding hopper and a ventilation assembly, the feeding hopper is provided with a crushing assembly, the tank body is provided with a stirring assembly, the bottom of the tank body is fixedly provided with a box body with an opening in the top, and a discharging hole communicated with the box body penetrates through the inner wall of the bottom of the tank body; a discharging hole is formed in one side of the box body, a baffle is installed in the discharging hole in a sliding mode, the baffle is connected with the inner wall of the box body in a sliding mode, a discharging hole is formed in one side of the box body, a cover plate is installed in the discharging hole in a sliding mode, a transverse plate is fixedly installed in the box body, two ejector rods penetrate through the transverse plate in a sliding mode, and the ejector rods are fixed to the bottom of the baffle. Through the simple discharging structure, compost in the aging bin can be conveniently and rapidly discharged, the problem that a traditional discharging pipe is prone to being blocked can be effectively solved, and great convenience is brought to use of the aging bin.

The utility model discloses a water flow control valve relates to valve technical field, including the valve body, the valve cover, the valve core and the valve stem that are connected, the top of valve cover is fixedly installed with the reduction gearbox through two L shape board, the inner top wall and the inner bottom wall of reduction gearbox all are equipped with the rotation hole. The water flow control valve of the present application passes through the transmission structure of "hand wheel - connecting shaft - rectangle column - pivot", and the valve stem and valve core action can be directly driven when rotating hand wheel, realizes the quick opening and closing of valve body, satisfies the efficient operation demand under the emergency scene, when needing to save the labor and fine adjustment flow, only needs to move down vertical slide frame, slide horizontal slide frame and unfasten the fixed completion, can drive the valve stem rotation through the meshing transmission of pinion and gear, and the operation step is simple, and the moment magnification effect is remarkable, and the dual demand of quick operation and fine adjustment is effectively taken into account, improves the scene adaptability and use convenience of valve.

The utility model belongs to the technical field of medical boxes, and particularly relates to a portable multi-layer patrol medical box which comprises a bottom plate, and a plurality of universal wheels are installed at the bottom of the bottom plate. A plurality of medicine storage boxes are sequentially arranged on the surface of the bottom plate in a sliding fit mode; an adjusting assembly is arranged on the side wall of the medicine storage box; by arranging a plurality of medicine storage boxes, different types of medicines can be stored through the multiple medicine storage boxes when the medicines are placed, so that the medicines can be quickly taken out from the different types of medicine storage boxes during use, the convenience is increased when the medicines are found, and meanwhile, an electric push rod can be erected when the medicine storage boxes are operated; the stability is improved, and the device is lifted to the waist of an operator so as to facilitate operation; when the medicine box needs to be moved, the telescopic pull rod can be pulled open and dragged to move forwards, meanwhile, when the side plates, the front plate and the elastic connecting shell are combined to form a box body, the medicine storage box can be protected more easily, and the influence of the outside on the medicine storage box is reduced.

The present invention discloses a mist-water mixed quenching device and method for intensive hot-rolled coil continuous heat treatment, comprising a plurality of alternately arranged mist spray beams and water spray beams, and the mist spray beams and the water spray beams are distributed on the upper and lower surface sides of the hot-rolled coil steel plate; the mist spray beam is provided with a mist nozzle on one end facing the hot-rolled coil steel plate, and a compressed air pipe 1 and a water pipe on the other end; the water spray beam is provided with a water nozzle on one end facing the hot-rolled coil steel plate, and a compressed air pipe 2 on the other end; the water nozzle is arranged obliquely and forms an angle with the moving direction of the hot-rolled coil steel plate. The present invention controls the cooling speed of the strip by changing the cooling method and pressure, and realizes the quenching of steel plates with different thickness specifications.

The utility model discloses a deep well layered packer detection device, and particularly relates to the technical field of packer detection, the deep well layered packer detection device comprises a shell, two first fixing frames are fixedly connected in the shell, and a sealing detection mechanism is movably connected in the two first fixing frames; the sealing detection mechanism comprises an outer cylinder, the outer side of the outer cylinder is fixedly connected with the inner walls of two fixing frames, an inner cylinder is fixedly connected into the outer cylinder, a heating pipe is installed on the inner wall of the outer cylinder, a protective sleeve is fixedly connected to the bottom of the outer cylinder, a sealing groove is formed in the bottom of the inner cylinder, and a temperature sensor is installed on one side of the inner cylinder. The bottom of the fixing rod is fixedly connected with a counterweight cover, and the bottom of the counterweight cover is fixedly connected with a sealing washer. By arranging the sealing detection mechanism, after the packer enters the detection device, the two ends of the detection device can be rapidly opened and closed through the sealing gasket and the sealing end disc, the temperature and the air pressure in the inner cylinder can be conveniently adjusted subsequently, and the detection of the packer is more accurate.

The utility model relates to a double-magnetic type quick-switching electromagnetic valve device which comprises a valve body, a control rod assembly is arranged in the valve body, an opening and closing assembly is arranged at a port of the valve body and connected with the control rod assembly, a buffering assembly is arranged between the opening and closing assembly and the control rod assembly, and a forward electromagnetic assembly is arranged at the front end of the valve body. The back end of the valve body is provided with a backward electromagnetic assembly, an electromagnetic check ring is distributed between the forward electromagnetic assembly and the backward electromagnetic assembly, the opening and closing assembly comprises a valve element connected with the buffering assembly and further comprises a valve sleeve connected with a port of the valve body, the valve element is located in the valve sleeve, a plurality of inflow holes are distributed in the valve sleeve, a plurality of flow guide through holes are distributed in the valve element, and the valve element is connected with the valve sleeve. And in the locking state, the inflow hole and the diversion through hole are staggered in position and are in a non-conducting state. Therefore, the forward electromagnetic assembly and the backward electromagnetic assembly are adopted, rapid position switching of the movable iron core can be achieved, therefore, rapid opening and closing of the valve are achieved, the corresponding time is short, and the flow control precision is improved.

The utility model provides a bag mouth structure for filling a liquid sealing bag, which is applied to the technical field of liquid sealing bags and is characterized by comprising a bag mouth and a one-way valve component mounted in the bag mouth, the one-way valve assembly comprises a sealing rubber plug and a lining which are arranged in the bag mouth, and a sealing face is formed between the sealing rubber plug and the lining through the elastic force effect of the sealing rubber plug. The sealing rubber plug has the technical effects that the sealing rubber plug has certain hardness and rebound resilience, certain pressure is applied to the sealing rubber plug, so that the sealing rubber plug can be shrunk, and a liquid channel is formed between the sealing rubber plug and the bushing, so that a liquid product can be conveniently filled and poured; when the external force is removed, the sealing rubber plug can rebound and abut against the lining through the elastic force of the sealing rubber plug, and a sealing face is formed between the sealing rubber plug and the lining to prevent medium backflow; and the bag mouth can be quickly opened and closed.

The utility model discloses a dust-proof industrial personal computer case convenient to disassemble and assemble, and particularly relates to the technical field of industrial personal computers, the dust-proof industrial personal computer case comprises an industrial personal computer case main body with an opening at the top, two sides of the industrial personal computer case main body are provided with dust-proof filter screens, and the top of the industrial personal computer case main body is provided with a pair of top plates; each top plate and the industrial personal computer case body are each provided with a rotating springback assembly, each rotating springback assembly comprises a pair of fixing blocks, the fixing blocks are fixedly connected to the outer surface of the industrial personal computer case body, rotating rods are rotationally connected to the fixing blocks, supporting blocks are fixedly connected to the rotating rods, the supporting blocks are fixedly connected to the top plates, the rotating rods are sleeved with torsional springs, and the torsional springs are fixedly connected to the supporting blocks. The two ends of the torsional spring are fixedly connected to the opposite faces of the fixing block and the supporting block correspondingly, and the two sides of each top plate are fixedly connected with positioning blocks correspondingly. According to the utility model, the technical problems that the industrial personal computer case needs to be disassembled and assembled with the help of a professional disassembling tool, and the use loss is easily caused due to the use of more fasteners are solved.

The utility model discloses a device for sun wheel frock limiting and dismounting, including a plurality of even installation in the test tray adaptation disc end surface's limiting component and be used to open quick -release subassembly of limiting component, quick -release subassembly sets up on the end surface of limiting component, is provided with a plurality of guide slot on quick -release subassembly, every guide slot with limiting component one -to -one, and the movable pin in limiting component one end stretches into guide slot, and the other end is connected spring pressure plate, and spring pressure plate pops out to the direction of adaptation disc center, and the application utilizes spring pressure plate in limiting component to complete to the axial location of sun wheel frock installed in test tray, simultaneously utilizes guide slot and drives movable pin to rotate to drive spring pressure plate to the radial movement of adaptation disc, opens limiting component finally, and the installation and dismounting of sun wheel frock are convenient.

The utility model provides a sulfur reduction device based on mine water treatment, which comprises a shell and a cover plate, one end of the shell is connected with the cover plate, a motor is arranged above the cover plate, a rotating shaft is arranged in the shell, the rotating shaft is in transmission connection with the motor, and the rotating shaft is connected with the cover plate. The rotating shaft is sequentially provided with an accelerated mixing assembly and an automatic pollution discharge assembly from top to bottom, a pollution discharge groove is formed in the side wall of the bottom of the shell, and the position of the pollution discharge groove corresponds to that of the automatic pollution discharge assembly. During sulfur reduction, adsorption can be better carried out through the accelerating mixing group, the adsorption effect is improved, the adsorption time is shortened, the reaction time is shortened, and the sulfur reduction efficiency is improved.

This application discloses a pressure reducing valve designed to prevent accidental opening, comprising: a valve body including an inlet, an outlet, and a filling port, wherein the inlet and outlet are connected by a fluid channel; a control valve core movably mounted on the valve body, the control valve core including a sealing end for controlling the opening and closing of the fluid channel and an exposed control end, the control end being recessed; and a protective cover with a control handle, the protective cover having a protective position covering the filling port and a control position where the control handle interacts with the control end of the control valve core. The technical solution disclosed in this application avoids external interference to the control valve core by recessing the control end, and achieves rapid opening and closing of the control valve core and convenient access to the control handle by providing a control handle on the protective cover, thus balancing the convenience of pressure reducing valve control with the safety of preventing accidental opening; the protective cover, while housing the control handle, also provides additional protection for the filling port, preventing wear during use.

The utility model discloses an automatic opening and closing mechanism of a sealing door, which comprises a sealing box, a lifting door is assembled on the side surface of the sealing box, vertical beams are symmetrically arranged on the sealing box on the two sides of the lifting door, and guide grooves for the lifting door to move up and down are arranged on the opposite side surfaces of the vertical beams; a lifting driving mechanism is installed on the working platform on the top face of the sealing box and drives a lifting plate to move up and down, and the lifting plate is connected with the top face of the lifting door through a connecting assembly. In the using process, the lifting driving mechanism drives the lifting door to move upwards or downwards through the lifting plate, and switching of the opening state and the closing state is conducted; the connecting assembly between the lifting plate and the top face of the lifting door is combined with the guide groove in the vertical beam, the free margin for attaching the lifting door to the sealing box when the lifting door is closed is provided, reliable attaching between the lifting door and the sealing box is effectively guaranteed, and the sealing performance is guaranteed.

The utility model discloses an engine coolant control valve device which comprises a seat body and an electronic thermolator assembly arranged on the seat body, the electronic thermolator assembly comprises a sealing cover, a thermolator body, a wax bag, a large circulation cover plate, a small circulation cover plate, a body spring and an electric heating pipe; the sealing cover is connected with the seat body; the thermolator body is arranged at the sealing cover; the wax bag is arranged in the thermolator body; the large circulation cover plate and the small circulation cover plate are arranged at the two ends of the wax bag; the body spring is arranged between the large circulation cover plate and the small circulation cover plate; the electric heating pipe is arranged in the wax bag; wherein the electric heating pipe can heat and melt the wax bag, so that a large circulation state or a small circulation state of the electronic thermolator assembly is realized. According to the control valve device for the engine cooling liquid, the cooling liquid large circulation opening of the electronic thermolator assembly can be rapidly opened in an electric heating mode under the condition of environmental requirements, and the situation that the water temperature is too high is avoided.

The utility model relates to the technical field of micro hyperbaric oxygen chambers, and discloses a novel household micro hyperbaric oxygen chamber which comprises a chamber body, a storage box is fixedly connected to the interior of the chamber body, a baffle is slidably connected to the inner wall of the storage box, and a positioning sleeve is fixedly connected to the outer wall of the baffle. The outer wall of the positioning sleeve is slidably connected to the interior of the storage box, the outer wall of the positioning sleeve is rotatably connected with a rotating ring, the inner wall of the rotating ring is fixedly connected with a special-shaped connecting rod, the interior of the special-shaped connecting rod is in threaded connection with a screw rod, one end of the screw rod is rotatably connected with a push block, and a limiting assembly is arranged on the outer wall of the push block. And a clamping block is slidably connected into the positioning sleeve. According to the utility model, the rotating ring is firstly driven to rotate on the outer wall of the positioning sleeve, so that the problem that the replacement frequency is not timely due to too tedious replacement process is solved, and the purpose of quickly replacing activated carbon is achieved, thereby shortening the maintenance time, improving the maintenance efficiency and reducing the downtime.

The miscellaneous fill grabbing device for construction comprises an excavator mechanical arm and a digging claw arranged at the end of the excavator mechanical arm, a mounting plate is arranged at the end of the excavator mechanical arm, and a material shaking mechanism used for controlling the digging claw to shake is arranged at the bottom of the mounting plate. An adjusting mechanism used for controlling the digging claw to rotate and open and close is arranged at the bottom of the adjusting mechanism, the digging claw comprises six grab buckets, the six grab buckets form a spherical digging claw after being closed, and a U-shaped groove is formed in the end of the excavator mechanical arm. The digging claw adopts the combination of the six grab buckets, so that soil can be surrounded more comprehensively, the grabbing capacity is improved, and rapid opening and closing of the grab buckets and vertical shaking and rotation of the digging claw can be realized, so that the soil can be effectively screened out, residues of large materials are reduced, large bricks and stones are reserved in the digging claw, the manual operation cost is saved, and the construction efficiency is improved.

The utility model relates to the technical field of insulating ring main units, in particular to an insulating ring main unit with a protection mechanism. Comprising a base, a first rectangular barrel is fixedly installed at the top of the base, a plurality of first holes which are evenly distributed penetrate through the inner wall of the first rectangular barrel, an annular cavity is formed in the first rectangular barrel, the first holes communicate with the annular cavity, and a second rectangular barrel is slidably installed in the annular cavity; a plurality of evenly-distributed second holes are formed in the inner wall of the second rectangular barrel in a penetrating mode, the second holes communicate with the corresponding first holes, a cover plate is arranged at the top of the first rectangular barrel, a rain shade is arranged at the top of the cover plate, and a mounting plate is fixedly mounted in the first rectangular barrel. According to the ring main unit provided by the utility model, the hole shielding structure is additionally arranged, so that holes in the ring main unit can be conveniently and quickly shielded in rainy days, the problem that water enters the ring main unit can be effectively reduced, and safe operation of electrical elements in the ring main unit is facilitated.

A smoke deflector opening and closing structure of a range hood comprises a range hood body, the front end of the range hood body is concavely provided with a smoke collecting cavity, the lower portion of the smoke collecting cavity is covered with a fixed panel, the space between the top of the fixed panel and the top of the smoke collecting cavity is hollowed out to form a smoke inlet, and guide grooves are symmetrically formed in the two sides of the smoke inlet; guide mechanisms are arranged on the two sides of the movable panel and extend into the guide grooves; the range hood further comprises a power mechanism, the power mechanism is connected between the range hood body and the movable panel, and the power mechanism drives the movable panel to move up and down, so that the smoke inlet is opened or closed. The utility model has the beneficial effects that the movable panel can be flatly aligned with the fixed panel after being closed, so that the common problem of panel dislocation in the traditional sliding design is solved, and the overall attractiveness of the product is improved.

The utility model discloses a high-integration control device for engine cooling liquid. The high-integration control device comprises a liquid buffer special pipeline, a degassing special pipeline and an electric control circulation device. One end of the liquid buffer special pipeline takes water from the cylinder body and then flows back to the electric control circulation device from the other end, the degassing special pipeline is integrated on the liquid buffer special pipeline, and the liquid buffer special pipeline comprises a liquid buffer water taking pipe and a degassing special pipeline, one end of the first liquid slow water return pipe is used for being connected with a liquid slow cooling device; one end of the connecting rubber pipe is hermetically communicated with the other end of the first liquid slow water return pipe; one end of the second liquid slow water return pipe is hermetically communicated with the other end of the connecting rubber pipe; one end of the third liquid slow return water pipe is hermetically communicated with the other end of the second liquid slow return water pipe, and the other end of the third liquid slow return water pipe is hermetically communicated with the electric control circulation device. Therefore, under the integrated cooperation of the liquid buffer pipeline, the degassing pipeline and the electric control circulation device, the stable operation of the whole vehicle cooling system can be ensured.

The utility model relates to the technical field of sandstone carrying, in particular to a sandstone moving device with a screening function. Comprising a vehicle plate, a box body with an opening in the top is fixedly installed at the top of the vehicle plate, an obliquely-arranged rectangular frame is fixedly installed in the box body, a sieve plate is slidably installed at the top of the rectangular frame, a plurality of first sliding blocks distributed in a rectangular array are slidably arranged on the rectangular frame in a penetrating mode, and the first sliding blocks are fixed to the bottom of the sieve plate; the bottom of the rectangular frame is fixedly provided with two electric cylinders, output rods of the electric cylinders are fixed to the corresponding first sliding blocks, two transverse rods are fixedly installed in the box body, the transverse rods are sleeved with sliding sleeves in a sliding mode, the bottoms of the two sliding sleeves are fixedly provided with the same push plate, and the push plate is installed in the box body in a sliding mode. And through a simple material pushing structure, the screened gravel can be conveniently and rapidly pushed and discharged, then the problem of manual auxiliary discharging can be effectively solved, and the building construction efficiency can be improved.

The utility model relates to the technical field of power transmission equipment, in particular to a box body for overhead power transmission equipment. Comprising a box body with an opening in one side, a U-shaped frame is fixedly installed on one side of the box body, a door plate matched with the opening of the box body is installed in the U-shaped frame in a sliding mode, two clamping grooves are formed in one side of the door plate, clamping plates are installed in the clamping grooves in a sliding mode and fixed to the inner wall of the U-shaped frame, and clamping rods penetrate through the clamping plates in a sliding mode. A cavity is formed in the door plate, two sliding plates are installed in the cavity in a sliding mode, one end of each clamping rod extends into the cavity and is fixed to the corresponding sliding plate, and a two-way lead screw penetrates through the two sliding plates in a threaded mode. Through the simple locking structure, the power transmission equipment box can be conveniently and rapidly opened and closed, the problem that the box door is blown by wind to rotate in the maintenance operation process can be effectively prevented, the box door can be effectively prevented from disturbing the maintenance operation, and the safety of high-altitude operation is effectively improved.

The utility model relates to the technical field of internal air pressure control of shield tunneling machines, in particular to a pressure maintaining system of a shield tunneling machine. The system comprises an air source and a main pipeline which is communicated with the air source and a shield tunneling machine soil bin, and an SAMSON pressure maintaining system is arranged at the main pipeline; a three-way valve is arranged at the position of the pipeline communicating the air source with the SAMSON pressure maintaining system, and a four-way valve is arranged at the position of the pipeline communicating the main pipeline with the SAMSON pressure maintaining system. An electromagnetic valve is arranged between the three-way valve and the four-way valve; an air pressure sensor is arranged at the position of the four-way valve and used for transmitting an air pressure signal in the soil bin to the controller, and the controller is used for controlling the electromagnetic valve to be opened and closed. The problem that construction of the shield tunneling machine is affected when the SAMSON system breaks down can be solved, and the effect of preventing the construction of the shield tunneling machine from being affected is achieved.

The utility model relates to the technical field of electric vehicles, in particular to a charging port cover plate for a pure electric vehicle, which comprises a charging port base and a sealing cover plate, the front side of the charging port base is fixedly connected with a limiting sleeve, and a left positioning shaft of the limiting sleeve is in bolted connection with a driving motor through a fixing bolt; a limiting sleeve is fixedly connected to the left side of the driving motor, a first gear is fixedly connected to a spindle on the right side of the driving motor, a microswitch is fixedly connected to the right side of the limiting sleeve, and a rotating shaft is rotationally connected into a limiting hole of the limiting sleeve. According to the device, rapid and accurate opening and closing of the charging port can be achieved, the motion trail of the charging port can be accurate and safe through soft and hard limiting, meanwhile, the device can be used for any vehicle series or vehicle types, the manufacturing cost is reduced, and the device is few in part, simple in structure, small in assembly difficulty and capable of saving time and labor during replacement or maintenance.