A vacuum isolation cabin door and its use method

Abstract

The present invention relates to a vacuum isolation door and a method for using the same. The vacuum isolation door comprises a box, a valve plate and a first driving mechanism. End face flanges are provided on both sides of the box and are respectively connected to vacuum pipes in a sealed manner. Two vacuum pipes are coaxially arranged. The top and bottom of the valve plate are respectively provided with protrusions. A slide groove is provided in the box. The protrusion is arranged in the slide groove and cooperates to form a sliding guide pair. The first driving mechanism drives the valve plate to slide in the box. The plate surface of the valve plate can move to or away from between the two vacuum pipes. A sealing end face is provided in the box. A second driving mechanism is provided on the plate surface of one side of the valve plate. The second driving mechanism is connected to a sealing door. An end face sealing ring and a spring are provided on the sealing door. The two ends of the spring act on the sealing door and the cylinder or hydraulic cylinder respectively. The spring is pre-compressed and installed. The sealing end face cooperates with the sealing door to form a sealing structure. The present invention has a simple structure, is easy to use, and has a good effect.

Description

Technical Field

[0001] The invention relates to the field of vacuum magnetic levitation, in particular to a vacuum isolation cabin door and a use method thereof. Background Art

[0002] Fluid conveying pipeline systems usually use gate valves, stop valves, butterfly valves, ball valves, plug valves, etc. to realize the opening and closing of fluid conveying pipeline systems. These valves are widely used in pipeline systems for conveying liquid water, liquid oil, gaseous materials, fluidized materials, etc.

[0003] At present, most of these valves are single-position switch valves, which are suitable for pipelines with smaller diameters. The pipeline system is unable to transport magnetic levitation vehicles or solid materials, and cannot perform on-off switching during the transportation process.

[0004] The on-off valve currently used for the passage of tangible objects is a gate cut-off valve. The gate valve is an opening and closing gate whose movement direction is perpendicular to the movement direction of the object. There are two types of gate valves: wedge gate valves and parallel gate valves.

[0005] The two sealing surfaces of the wedge gate form a wedge shape, and the sealing is achieved by the compression pressure between the wedge sealing surface and the valve body sealing surface ensured by the valve stem thrust. The processing requirements for the wedge gate and the wedge sealing surface of the valve body are high and easy to wear. The valve stem thrust needs to be kept constant for a long time. It is only suitable for gate shut-off valves with small and medium diameters and cannot meet the switching and sealing needs of vacuum magnetic levitation vacuum pipelines.

[0006] The sealing surface of the parallel gate valve is parallel to the moving direction of the gate. The parallel gate valve is mainly composed of the gate, sealing device, sealing actuator, gate moving mechanism, valve body, etc. The movement of the gate is achieved by the rotation of the trapezoidal thread screw nut pair. There are two types of drive: manual and electric. For large gate valves, electric drive is used to move the gate to the open position and the closed position. The sealing of the parallel gate valve is achieved by a plurality of parallel four-bar mechanisms composed of the top rod mechanism of the sealing actuator, the inclined rod mechanism and the sealing plate of the sealing device to push the sealing plate outward in parallel. The inclined rod mechanism changes from tilted to vertical until the sealing ring on the sealing plate abuts against the sealing end face of the valve body, meets and maintains the sealing force requirements, and achieves sealing and closing the gate valve; the driving of the sealing actuator is also achieved by the trapezoidal thread screw nut pair.

[0007] In order to ensure the reliable and stable operation of the sealing device, sealing actuator, gate plate and moving mechanism, it is also necessary to set up: (1) multiple sets of panel support wheels and side plate guide wheels to ensure that the valve plate moves smoothly in the valve body with the valve body or guide rail as a guide, (2) multiple sets of rollers are set on the valve plate. When the valve plate moves to the valve port, the valve plate rollers are in place and the valve plate stops moving forward, (3) multiple sets of sealing plate wheels for guiding the sealing plate, and (4) valve plate load-bearing wheels and guide wheel groups for bearing the weight of the entire valve plate and the various mechanisms installed thereon.

[0008] Therefore, the parallel gate valve has many mechanisms and complex structure, is difficult to manufacture, has high cost and high failure rate; its sealing device and sealing actuator are both arranged inside the gate, and after failure, they are inspected, maintained and replaced unchanged; the opening and closing of the sealing device are realized by multiple sets of parallel four-bar mechanisms and multiple sets of panel support wheels. Due to the inevitable errors in manufacturing and installation and the large number of conversion links, the flatness of the sealing surface of the sealing plate is low, the sealing effect is not ideal, and it is difficult to meet the sealing and switching requirements of such large magnetic levitation vacuum pipelines.

[0009] In view of the existing technologies of various switch shut-off valves, for special working conditions such as vacuum working environment, large tangible solid magnetic levitation train passing through, large diameter of vacuum pipeline (generally 3m to 8m), and high sealing requirements, the existing gate valve sealing structure technology has sealing problems and many shortcomings, and the panel support wheel kinematic pair is easy to deviate and derail under the action of the axial thrust of the pipeline, and its positioning accuracy in the axial direction of the pipeline is poor, resulting in poor sealing performance, which makes it difficult to meet the sealing and switching requirements of the magnetic levitation vacuum pipeline. Summary of the invention

[0010] The purpose of the present invention is to provide a vacuum isolation cabin door and a method for using the same in view of the structural characteristics and existing deficiencies of the existing gate valve technology, as well as the difficulty in scaling up and meeting the sealing and switching requirements of the magnetic levitation vacuum pipeline, especially the problem that the panel support wheel kinematic pair is easily derailed under the axial thrust of the pipeline and the positioning accuracy in the axial direction of the pipeline is poor, resulting in poor sealing performance.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] A vacuum isolation cabin door, comprising a box body, a valve plate and a first driving mechanism, the box body is provided with end face flanges on both sides, which are respectively sealed and connected with vacuum pipes, the two vacuum pipes are coaxially arranged, the top and bottom of the valve plate are respectively provided with protrusions, the box body is provided with a slide groove, the protrusion is arranged in the slide groove, and cooperates to form a sliding guide pair, the first driving mechanism drives the valve plate to slide in the box body, the plate surface of the valve plate can move to or away from between the two vacuum pipes, the box body is provided with a sealing end face, the valve plate is provided with a second driving mechanism, the second driving mechanism is connected to a sealing door, the sealing door is provided with an end face sealing ring and a spring, the two ends of the spring act on the sealing door and the cylinder or hydraulic cylinder body respectively, or the two ends of the spring act on the pipe end flange and the spline key respectively, the spring is pre-compressed and installed, the sealing end face and the sealing door cooperate with each other to form a sealing structure;

[0013] Among them, in one way, the end face sealing ring is pressed against the sealing end face by the spring force of the spring to form a normally closed structure, and the second driving mechanism can drive the sealing door to compress the spring and move away from the sealing end face, so that the end face sealing ring and the sealing end face are separated to form a designed distance and the sealing door is opened;

[0014] Alternatively, in another way, the sealing door is pressed against the pipe end flange by the spring force of the spring, so that there is a gap between the end face sealing ring and the plane where the sealing end face is located, forming a normally open structure, and the second driving mechanism can drive the sealing door to compress the spring and abut the sealing end face, so that the end face sealing ring is fitted with the sealing end face and the sealing door is closed.

[0015] By adopting a vacuum isolation cabin door described in the present invention, the second driving mechanism is not required to work. The end face sealing ring is pressed onto the sealing end face only by the spring force provided by the spring, so as to realize the normal closing of the vacuum isolation cabin door, or the sealing door is attached to the pipe end flange and away from the sealing end face only by the spring force provided by the spring, so as to realize the normal opening of the vacuum isolation cabin door, which can effectively save the use cost; the valve plate is driven to slide in the box body by the first driving mechanism, so as to block or pass through the vacuum pipe; the convex block is arranged in the slide groove to cooperate with the sliding guide pair, so as to have high axial positioning accuracy, and bear the axial sealing thrust of the spring or the second driving mechanism and the pressure difference thrust of the vacuum pipe, thereby avoiding the problems of small axial bearing capacity and low positioning accuracy of the wheel guide device used in the prior art; the vacuum isolation cabin door has a simple structure, is easy to use and has good effect.

[0016] Preferably, a plurality of the springs are evenly arranged along the circumference of the sealing door.

[0017] With this structure, a plurality of evenly distributed springs act on the circumference of the sealing door, which can provide evenly distributed spring force for the sealing door and match it on the valve plate.

[0018] Further preferably, a pull rod is provided on the valve plate, the pull rod is connected to the sealing door, the spring guide sleeve is sleeved outside the pull rod, and the spring sleeve is sleeved outside the spring guide sleeve.

[0019] With this structure, the pull rod serves as a guide for the spring guide sleeve, and the spring guide sleeve serves as a guide tube for the spring, thereby preventing the spring from undergoing large radial deformation and affecting the stability of the spring force and the service life of the spring.

[0020] Further preferably, the pull rod passes through the rear outer side of the sealing door and is connected to a locking nut and locked.

[0021] Further preferably, the second driving mechanism comprises a plurality of air cylinders or hydraulic cylinders, the air cylinders or hydraulic cylinders are evenly distributed along the circumference of the sealing door, and the cylinder bodies of the air cylinders or hydraulic cylinders are connected to the valve plate.

[0022] With this structure, several evenly distributed air cylinders or hydraulic cylinders are connected around the sealing door, which can provide uniform thrust to the circumferentially pre-compressed spring, avoiding deformation of the sealing door end face due to uneven force, affecting the sealing performance and smooth movement of the sealing door.

[0023] Further preferably, when a normally closed structure is adopted, one end of the pull rod is connected to the piston rod end of the cylinder or hydraulic cylinder, and the two ends of the spring act on the sealing door and the cylinder body end of the cylinder or hydraulic cylinder respectively.

[0024] With this structure, the pull rod, the spring guide sleeve, the spring and the cylinder or hydraulic cylinder form a single actuator for moving the sealing door, the pull rod is driven by the cylinder or hydraulic cylinder, the spring guide sleeve axially guides the spring and limits the direction of elastic deformation of the spring, the spring pushes the sealing door toward the sealing end face, the end face sealing ring fits with the sealing end face, and the sealing isolation is achieved to realize the normal closure of the cabin door; the cylinder or hydraulic cylinder pulls the sealing door through the pull rod, and the sealing door moves away from the sealing end face until it fits with the valve plate, and the sealing door forms a designed distance with the sealing end face to realize normal opening of the cabin door; the cylinder or hydraulic cylinder uses the same air source or hydraulic oil source to supply air or oil simultaneously through the same pipeline system, which ensures the consistency and stability of the force transmission size and direction of each actuator, and the sealing door is subjected to balanced force along the circumference, and the sealing effect is good.

[0025] Further preferably, when a normally closed structure is adopted, a groove is provided at the end of the piston rod of the air cylinder or hydraulic cylinder, and the end of the pull rod extends into the groove and is hinged to the end of the piston rod of the air cylinder or hydraulic cylinder.

[0026] With this structure, the pull rod has a certain deflection relative to the piston rod of the air cylinder or hydraulic cylinder, making the installation and matching of the sealing door more convenient, and the bearing force of the sealing door can be adaptively and evenly distributed on the sealing end surface.

[0027] Further preferably, when a normally closed structure is adopted, a pin hole is provided at the end of the piston rod of the air cylinder or hydraulic cylinder at the groove body, and a matching pin hole is provided at the end of the pull rod, and the pin holes are connected by a cylindrical pin.

[0028] Further preferably, when a normally open structure is adopted, a pipe end flange is provided on the valve plate, and the pipe end flange is located on one side of the sealing door, the pull rod includes a spline keypad and a rod body, and the spline keypad and the rod body form an integrated structure, the spline keypad is provided with a spline groove matching the spring guide sleeve, and one end of the spring guide sleeve is provided with spline teeth matching the spline keypad, the spline teeth pass through the spline groove of the spline keypad and abut against the piston rod end of the cylinder or hydraulic cylinder and are matched and connected with the piston rod end, the other end of the spring guide sleeve passes through and is slidably connected to the pipe end flange and abuts against the sealing door, one end of the spring abuts against the pipe end flange, and the other end abuts against the spline keypad, and the sealing door pushes the pull rod under the action of the spring force of the spring to abut the sealing door against the pipe end flange and away from the sealing end face to form a normally open structure, and the piston rod of the cylinder or hydraulic cylinder can push the spring guide sleeve to move axially, and push the sealing door to abut against the sealing end face, so that the end face sealing ring fits with the sealing end face and the sealing door is closed.

[0029] Further preferably, the vacuum isolation cabin door also includes piping, which includes a circular tube and a hose, and the circular tube is connected to all the cylinders or hydraulic cylinders at the same time. The box body is provided with a box-penetrating joint, and the box-penetrating joint is connected to the hose inside and to the air station or hydraulic station outside, and the hose is connected to the circular tube.

[0030] Preferably, the sealing door on which the end face sealing ring is arranged is provided with a stepped positioning groove, and the end face sealing ring is arranged in the stepped positioning groove.

[0031] With this structure, the end face sealing ring is positioned and limited by the stepped positioning groove.

[0032] Further preferably, the inner ring of the end face sealing ring is sleeved on the step surface of the step positioning groove, and the outer ring of the end face sealing ring is matched with a sealing pressure ring.

[0033] With this structure, the sealing pressure ring is used to ensure that the end face sealing ring can work normally and will not be crushed by the sealing end face.

[0034] Further preferably, the end face sealing ring may be a trapezoidal sealing ring, an O-ring or other sealing ring.

[0035] Preferably, a limit sensor is provided on the adjacent surface of the sealing end surface, and the limit sensor is a proximity switch, a limit switch or other position detection sensor.

[0036] With this structure, the limit sensor is used to detect and control the approach degree of the sealing door, and also prevents the sealing end face and the sealing flange from crushing the end face sealing ring.

[0037] Preferably, at least one first through hole is provided on the sealing door, and the first through hole communicates with two sides of the sealing door.

[0038] With this structure, when the vacuum isolation cabin door is in the process of changing from closed to open or from open to closed, the sealing door is connected front to back, and the pressure difference between the two vacuum pipes directly acts on the valve plate instead of on the sealing door, so that the force for opening and closing the sealing door is smaller, that is, the spring with smaller spring force or the second driving mechanism with smaller driving force can push the sealing door, so that the end face sealing ring is close to or away from the sealing end face, which can reduce the cost of the spring and the second driving mechanism.

[0039] Further preferably, the sealing door includes a sealing ring and a sealing flange, the sealing flange is connected to the end of the sealing ring, the sealing ring and the sealing flange form a component with an L-shaped cross-section, the valve plate is provided with a mounting hole for installing the sealing door, the outer ring surface of the sealing ring is slidably connected to the mounting hole, the outer ring surface of the sealing ring is provided with a mounting groove, the mounting groove is provided with a radial sealing ring and a guide ring, and the radial sealing ring is tightly attached to the mounting hole.

[0040] With this structure, the radial sealing ring is used to achieve sealing isolation on both sides of the mounting hole, and the guide ring is used to support the sealing ring in the mounting hole and protect the radial sealing ring.

[0041] Further preferably, the sealing ring and the sealing flange are integrally formed components.

[0042] Further preferably, the guide rings are provided on both sides of the radial sealing ring.

[0043] Further preferably, the guide ring is a slip-resistant and wear-resistant plate.

[0044] Further preferably, the guide ring is a polytetrafluoroethylene plate.

[0045] Further preferably, a grid structure is connected inside the sealing ring, and the first through hole is arranged on the grid structure.

[0046] With this structure, the grid structure enhances the rigidity of the sealing ring, making it difficult for the sealing door to deform, achieving a good sealing effect, and saving materials for manufacturing the sealing door.

[0047] Preferably, the slide groove is U-shaped.

[0048] Preferably, the slide groove is arranged along the length direction of the box body.

[0049] Preferably, the convex portion of the convex block has three working surfaces, each of the working surfaces is provided with a group of slide plates, each group of the slide plates includes a plurality of slide plates, and the slide plates are fitted in the slide grooves.

[0050] Further preferably, the slide plates are evenly arranged.

[0051] Further preferably, the slide plate is mounted on the protrusion via a fastener.

[0052] Further preferably, the slide plate is a wear-resistant lubricating lining.

[0053] Further preferably, the slide plate is a self-lubricating wear-resistant lining plate.

[0054] Preferably, the first driving mechanism is a screw system, an oil cylinder system, an air cylinder system, a pulley system, a gear rack system or a sprocket chain system, the fixed parts of the screw system, the oil cylinder system, the air cylinder system, the pulley system, the gear rack system or the sprocket chain system are connected to the box body, and the moving parts of the screw system, the oil cylinder system, the air cylinder system, the pulley system, the gear rack system or the sprocket chain system are connected to the valve plate.

[0055] Preferably, the screw system includes a screw and a driver, the driver is located outside the box body and sealed and fixed on the box body, the screw is connected to the box body, the driver is connected to one end of the screw and can drive the screw to rotate, the screw is connected to a screw nut, the screw nut is connected to the valve plate, and the screw is arranged along the sliding direction of the valve plate.

[0056] With this structure, the driver rotates to drive the lead screw to rotate, and the lead screw rotation drives the lead screw nut to reciprocate along the lead screw in a straight line, thereby driving the valve plate to slide in the box.

[0057] Further preferably, the screw system also includes a rotary encoder, which is connected to the housing and the other end of the screw.

[0058] With this structure, the rotary encoder measures the angular displacement or angular velocity of the lead screw, and controls the moving distance of the lead screw nut in conjunction with the pitch of the lead screw, thereby being able to precisely control the moving distance and accurate positioning of the valve plate.

[0059] Further preferably, the driver is connected to one end of the lead screw via a coupling, and the other end of the lead screw is connected to the rotary encoder via a coupling.

[0060] Further preferably, the lead screw is installed in the housing through two lead screw bearing seats, and the lead screw bearing seats support the lead screw.

[0061] Further preferably, the screw nut is connected to the nut bearing seat, and the nut bearing seat is connected to the valve plate.

[0062] Further preferably, the driver is a motor.

[0063] Preferably, the box body comprises a front half box body, a rear half box body and an end cover, the front half box body and the rear half box body are sealed together, a box body seal is arranged on the joint surface, the same end of the front half box body and the rear half box body is sealed together with the end cover, and an end cover seal is arranged on the joint surface.

[0064] Further preferably, the box body seal and the end cover seal may be strip seals or plate seals.

[0065] Further preferably, stoppers are used for positioning between the mating surfaces of the front half box, the rear half box and the end cover.

[0066] Preferably, the box body is provided with three independent workstations in sequence, the workstation in the middle is a box body connecting workstation connected to the vacuum pipe, both sides of the box body connecting workstation are respectively stay workstations for accommodating the valve plate, the box body connecting workstations are distributed on the front and back sides of the box body and are coaxially arranged, the box body connecting workstations are round tubes with the same inner diameter as the vacuum pipe, and the sealing end face is arranged on the side of the box body connecting workstation facing the valve plate.

[0067] Further preferably, a box mounting platform is provided at the bottom of the circular tube of the box connecting station, and the box mounting platform is used to install the magnetic levitation motor bracket.

[0068] Further preferably, the valve plate is provided with two independent stations in sequence, one is a valve plate sealing station, and the other is a valve plate connecting station, the valve plate connecting station is a round tube with the same inner diameter as the box connecting station, and the valve plate sealing station is provided with the sealing door.

[0069] With this structure, the valve plate moves once in the box body, so that the valve plate sealing position is aligned with the box body connecting position, while the valve plate connecting position is away from the box body connecting position, thereby isolating the two vacuum pipes. Similarly, when resetting, the valve plate connecting position is aligned with the box body connecting position, while the valve plate sealing position is away from the box body connecting position, thereby connecting the two vacuum pipes.

[0070] Further preferably, a valve plate mounting platform is provided at the bottom of the circular tube of the valve plate connecting station, and the valve plate mounting platform is used for mounting the magnetic suspension motor bracket.

[0071] The present invention also provides a bidirectionally sealed vacuum isolation cabin door, including a vacuum isolation cabin door as described in any of the above items, wherein one sealing door is respectively arranged on both sides of the valve plate sealing station, and the two sealing doors are respectively used to seal the corresponding vacuum pipes.

[0072] By adopting the bidirectionally sealed vacuum isolation cabin door described in the present invention, the two vacuum pipes connected to the box body are sealed separately through two sets of sealing structures, and have better sealing performance. When a single set of the sealing structures has problems and causes the seal to fail, the other set of the sealing structures can still effectively seal and separate the two adjacent vacuum pipes, providing a reliable vacuum environment for the vacuum pipeline system; in addition, the spring forces of the springs or the driving forces of the second driving mechanisms in the two sets of the sealing structures are in opposite directions, and the spring forces acting on the valve plate or the driving forces of the second driving mechanisms can offset each other well, so that the axial thrust of the sliding guide pair of the valve plate and the box body is greatly reduced or even eliminated. The vacuum isolation cabin door has a simple structure, is easy to use, and has a good effect.

[0073] The present invention also provides a method for using a vacuum isolation cabin door, using the vacuum isolation cabin door as described in any one of the above items or the bidirectionally sealed vacuum isolation cabin door, the method comprising:

[0074] When the normally closed vacuum isolation door is in the normally closed state, the second driving mechanism pulls the sealing door away from the sealing end face and abuts against the annular tube end of the valve plate, compresses the spring, overcomes the spring force, and the end face sealing ring moves away from the sealing end face, and the seal between the two vacuum pipes on both sides of the box is released and there is no pressure difference; the first driving mechanism drives the valve plate to slide in the box, the valve plate sealing station moves away from the box connecting station, and the valve plate connecting station moves to be aligned and coaxial with the box connecting station, so that the two vacuum pipes on both sides of the box are connected, thereby realizing the opening of the vacuum isolation door;

[0075] When the normally closed vacuum isolation door is in an open state, the valve plate is driven to slide in the box body by the first driving mechanism, and the sealing door moves to be aligned with the connecting station of the box body, so that the two vacuum pipes on both sides of the box body are isolated; at the same time, the second driving mechanism stops moving and releases pressure, so that the sealing door is pushed to move toward the sealing end face and abut against the sealing end face under the action of the spring force of the spring, and the end face sealing ring is fitted with the sealing end face, so that the vacuum isolation door is normally closed.

[0076] When the normally open vacuum isolation door is in the normally open state, the first driving mechanism drives the valve plate to slide in the box body, and the sealing door moves to align with the connecting station of the box body, so that the two vacuum pipes on both sides of the box body are isolated; the second driving mechanism pushes the sealing door to move toward the sealing end face and abut against the sealing end face, compresses the spring, overcomes the spring force, and the end face sealing ring fits against the sealing end face, and the two vacuum pipes on both sides of the box body are sealed and isolated, thereby achieving the closing of the vacuum isolation door.

[0077] When the normally open vacuum isolation door is in a closed state, by stopping the action of the second driving mechanism and releasing the pressure, the sealing door is pushed to move toward the pipe end flange and abut against the pipe end flange under the action of the spring force of the spring, the end face sealing ring is away from the sealing end face, the seal between the two vacuum pipes on both sides of the box body is released and there is no pressure difference; the first driving mechanism drives the valve plate to slide in the box body, the sealing door is away from the box body connecting station, and the valve plate connecting station moves to be aligned and coaxial with the box body connecting station, so that the two vacuum pipes on both sides of the box body are connected, and the vacuum isolation door is normally open.

[0078] By adopting the method for using a vacuum isolation cabin door described in the present invention, the pressure of the cylinder or hydraulic cylinder can be individually adjusted according to the different vacuum degrees of the pipeline to meet the different vacuum degree requirements of the pipeline; the method has simple steps, easy operation, few action steps, can respond quickly, and has good effects.

[0079] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0080] 1. The vacuum isolation door described in the present invention does not require the second driving mechanism to work. The end face sealing ring is pressed against the sealing end face only by the spring force provided by the spring to realize the normal closing of the vacuum isolation door, or the sealing door is attached to the valve plate only by the spring force provided by the spring to realize the normal opening of the vacuum isolation door, which can effectively save the use cost; the valve plate is driven to slide in the box by the first driving mechanism to block or pass through the vacuum pipe; the convex block is arranged in the slide groove to cooperate with the sliding guide pair, the axial positioning accuracy is high, and the axial sealing thrust of the spring or the second driving mechanism and the pressure difference thrust of the vacuum pipe are borne, thereby avoiding the problems of small axial bearing force and low positioning accuracy of the wheel guide device used in the prior art; the vacuum isolation door has a simple structure, is easy to use and has good effect;

[0081] 2. A preferred vacuum isolation door of the present invention, wherein at least one first through hole is provided on the sealing door, wherein the first through hole is connected to both sides of the sealing door, and the sealing door is connected front to back during the process of the vacuum isolation door from closing to opening or from opening to closing, and the pressure difference between the two vacuum pipes directly acts on the valve plate instead of on the sealing door, so that the force for opening and closing the sealing door is relatively small, that is, the spring with a relatively small spring force or the second driving mechanism with a relatively small driving force can be used to push the sealing door, so that the end face sealing ring is close to or away from the sealing end face, and the cost of the spring and the second driving mechanism can be reduced;

[0082] 3. The bidirectionally sealed vacuum isolation hatch described in the present invention has better sealing performance, and when a single set of the sealing structure has problems and causes the seal to fail, the other set of the sealing structure can still effectively seal and separate the two adjacent vacuum pipes, providing a reliable vacuum environment for the vacuum pipeline system; in addition, the spring force of the spring or the driving force of the second driving mechanism in the two sets of the sealing structures are in opposite directions, and the spring force acting on the valve plate or the driving force of the second driving mechanism can offset each other well, so that the axial thrust of the sliding guide pair matched with the valve plate and the box is greatly reduced or even eliminated. The vacuum isolation hatch has a simple structure, is easy to use, and has a good effect;

[0083] 4. Using the method for using a vacuum isolation door described in the present invention, when the normally closed vacuum isolation door is in a normally closed state, the spring pressure is overcome by the action of the second driving mechanism, so that the spring force pressing the end face sealing ring against the sealing end face is released, the seal of the vacuum pipe is released, and the internal pressures thereof are consistent, and then the valve plate is driven to slide in the box body by the first driving mechanism, and the valve plate connecting station is moved to be aligned and coaxial with the box body connecting station, so that the vacuum pipe is connected and the door is in an open state; when the vacuum isolation door is in an open state, the valve plate is driven to slide in the box body by the first driving mechanism, and the valve plate sealing station is moved to be aligned with the box body connecting station, so that the vacuum pipe is isolated, and then the spring force is overcome by the action of the second driving mechanism to push the sealing door against the sealing end face, so that the end face sealing ring is attached to the sealing end face, so that the vacuum pipe is closed and sealed and isolated;

[0084] By using the method for using a vacuum isolation cabin door described in the present invention, when the normally open vacuum isolation cabin door is in the normally open state, the first driving mechanism drives the valve plate to slide in the box body, the valve plate sealing station moves to align with the box body connecting station, so that the two vacuum pipes on both sides of the box body are isolated, and the second driving mechanism pushes the sealing door to overcome the spring force of the spring, the end face sealing ring is pushed to fit the sealing end face, and the two vacuum pipes on both sides of the box body are sealed and isolated, so that the vacuum isolation cabin door is in the closed state; when the vacuum isolation cabin door When in the closed state, the second driving mechanism stops moving and releases pressure, and the sealing door is pushed to move toward the pipe end flange and abut against the pipe end flange under the spring force of the spring, and the end face sealing ring moves away from the sealing end face, and the seal between the two vacuum pipes on both sides of the box body is released, and the first driving mechanism drives the valve plate to slide in the box body, and the valve plate sealing door moves away from the box body connecting station, and the valve plate connecting station moves to be aligned and coaxial with the box body connecting station, so that the two vacuum pipes on both sides of the box body are connected, so that the vacuum isolation cabin door is in a normally open state;

[0085] By adopting the method for using a vacuum isolation cabin door described in the present invention, the pressure of the cylinder or hydraulic cylinder can be individually adjusted according to the different vacuum degrees of the pipeline to meet the different vacuum degree requirements of the pipeline; the method has simple steps, easy operation, few action steps, can respond quickly, and has good effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1 It is a schematic diagram of the cross-sectional structure of a one-way normally closed vacuum isolation cabin door in a normally closed state;

[0087] Figure 2 It is a schematic diagram of the cross-sectional structure of a one-way normally closed vacuum isolation cabin door in an open state;

[0088] Figure 3 It is a schematic diagram of the top view of the structure of a one-way normally closed vacuum isolation cabin door;

[0089] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0090] Figure 5 for Figure 4 The enlarged structural diagram of the middle D part;

[0091] Figure 6 for Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0092] Figure 7 for Figure 2 Schematic diagram of the cross-sectional structure of the CC;

[0093] Figure 8 It is a schematic diagram of the longitudinal section structure of the bidirectional normally closed vacuum isolation cabin door in the normally closed state;

[0094] Fig. 9 for Figure 8 The enlarged structural diagram of the middle E part;

[0095] Fig.10 It is a schematic diagram of the cross-sectional structure of a one-way normally open vacuum isolation cabin door in a normally open state;

[0096] Fig.11 It is a schematic diagram of the cross-sectional structure of the one-way normally open vacuum isolation cabin door in a closed state;

[0097] Fig.12 It is a schematic diagram of the top view of the structure of a one-way normally open vacuum isolation cabin door;

[0098] Fig.13 for Fig.10 A'-A' cross-sectional structural diagram;

[0099] Fig.14 for Fig.10 A schematic diagram of the cross-sectional structure along line B'-B';

[0100] Fig.15 for Fig.11 Schematic diagram of the cross-sectional structure of C'-C';

[0101] Fig.16 for Fig.15 The enlarged structural diagram of the D' portion in the middle;

[0102] Fig.17 for Fig.16 Schematic diagram of the cross-sectional structure of FF;

[0103] Fig.18 It is a schematic diagram of the longitudinal section structure of the bidirectional normally open vacuum isolation cabin door in the closed state;

[0104] Fig.19 for Fig.18 The enlarged structural diagram of the E' section in the middle;

[0105] Fig. 20 for Fig.19 Schematic diagram of the cross-sectional structure of GG.

[0106] Markings in the figure: 01-vacuum pipe, 1-box, 11-front half box, 12-rear half box, 13-end cover, 14-box seal, 15-end cover seal, 16-box connecting station, 17-box mounting table, 18-slide, 19-sealing end face, 191-limit sensor, 2-valve plate, 21-valve plate sealing station, 211-annular pipe, 212-pipe end flange, 22-valve plate connecting station, 23-sealing door, 231-first through hole, 232-radial sealing ring, 233-guide ring, 234-end face sealing ring, 235-sealing pressure ring, 24-bump, 241-slide plate, 25-cylinder or hydraulic cylinder, 26-pull rod, 261-locking nut, 262-cylindrical pin, 263-spline key, 264-rod body, 27-spring, 28-spring guide sleeve, 281-spline tooth, 29-valve plate mounting platform, 3-first driving mechanism, 31-screw, 32-driver, 33-screw bearing seat, 34-nut bearing seat, 35-rotary encoder, 4-piping, 41-annular tube, 42-hose. DETAILED DESCRIPTION

[0107] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0108] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0109] Example 1

[0110] like Figures 1 to 7 As shown, a vacuum isolation cabin door described in the present invention includes a box body 1, a valve plate 2, a first driving mechanism 3 and a pipe 4, and is a normally closed door.

[0111] like Figures 1 to 3 As shown, the box body 1 includes a front half box body 11, a rear half box body 12 and an end cover 13. The front half box body 11 and the rear half box body 12 are combined to form a right box body through a stopper, a joint surface and bolts. A sealing groove is processed on the joint surface, and a box body seal 14 is installed therein. The left end surface of the right box body is processed with a stopper and a joint surface for positioning with the end cover 13. The right box body and the end cover 13 are connected by bolts. A sealing groove is processed on the joint surface, and an end cover seal 15 is installed therein. The front half box body 11 and the rear half box body 12 are respectively connected to a vacuum pipe 01, and the two vacuum pipes 01 are coaxial and aligned. The box body seal 14 and the end cover seal 15 can be either a sealing strip, or other seals such as an "O"-shaped sealing ring, a plate-type sealing gasket, etc.

[0112] like Figures 1 to 3As shown, the box body 1 is provided with three independent workstations, the middle workstation is a box body connecting workstation 16 for connecting with the vacuum pipe 01, the left and right workstations are respectively used to accommodate the valve plate 2, and the box body connecting workstation 16 is distributed on the front and rear sides of the box body 1, that is, the front half box body 11 and the rear half box body 12 are respectively provided with a box body connecting workstation 16, and the box body connecting workstation 16 is a circular tube with the same inner diameter as the vacuum pipe 01, and the two box body connecting workstations 16 are oppositely and coaxially arranged.

[0113] like Figure 4 As shown, both ends of the box connecting station 16 are provided with flanges, the flange facing the outside of the box 1 is used for flange sealing connection to the corresponding vacuum pipe 01, the flanges facing the inside of the box 1 are the installation space of the valve plate 2, and the end face of the flange facing the inside of the box 1 is the sealing end face 19, and a limit sensor 191 is provided on the adjacent surface of the sealing end face 19, the limit sensor 191 is a proximity switch, a limit switch or other position detection sensor, and the adjacent surface can be the inner ring surface of the flange or the outer ring surface of the flange.

[0114] like Figure 7 As shown, a box mounting platform 17 is provided at the bottom of the circular tube of the box connecting station 16, and the box mounting platform 17 is used to install the magnetic suspension motor bracket.

[0115] like Figure 1 , Figure 2 , Figures 4 to 7 As shown, the inner top surface and the inner bottom surface of the box body 1 are respectively provided with slide grooves 18 from left to right, that is, the slide grooves 18 are arranged along the length direction of the front half box body 11 and the rear half box body 12, and the slide grooves 18 are U-shaped.

[0116] like Figure 1 and Figure 2 As shown, the valve plate 2 is provided with two independent stations, one is a valve plate sealing station 21, and the other is a valve plate connecting station 22. The valve plate connecting station 22 is arranged on the right side of the valve plate 2. The valve plate connecting station 22 is a round tube with the same inner diameter as the box connecting station 16. A valve plate mounting platform 29 is arranged at the bottom of the round tube of the valve plate connecting station 22. The valve plate mounting platform 29 is used to install the magnetic levitation motor bracket. The valve plate sealing station 21 is arranged on the left side of the valve plate 2. A sealing door 23 is provided at the valve plate sealing station 21. The sealing door 23 on the valve plate 2 and the sealing end face 19 on the box 1 cooperate with each other to form a sealing structure.

[0117] like Figure 4 and Figure 5As shown, the sealing door 23 includes a sealing ring and a sealing flange, and the sealing flange is connected to the end of the sealing ring. Preferably, the sealing ring and the sealing flange are integrally formed components, and the sealing ring and the sealing flange form a component with an L-shaped cross-section. The valve plate sealing station 21 is formed by welding an annular tube 211 with an internal web and rib plate and an external web and rib plate, and is an integral structure with the valve plate 2. A mounting hole for mounting the sealing door 23 is provided in the annular tube 211, and the outer annular surface of the sealing ring is slidably connected to the mounting hole. The outer annular surface of the sealing ring is The radial sealing ring 232 and the guide ring 233 are provided with mounting grooves, the radial sealing ring 232 is installed in the middle groove, and the two guide rings 233 are respectively installed in the mounting grooves on both sides of the radial sealing ring 232, the radial sealing ring 232 is tightly attached to the mounting hole, the guide ring 233 is an easy-slip and wear-resistant plate, and a polytetrafluoroethylene plate is used in this embodiment. The radial sealing ring 232 is used to achieve sealing isolation on both sides of the mounting hole, and the guide ring 233 is used to support the sealing ring in the mounting hole and protect the radial sealing ring 232.

[0118] like Figure 5 As shown, there is a grid structure inside the sealing ring, and the grid structure enhances the rigidity of the sealing ring, so that the sealing door 23 is not easily deformed and has a good sealing effect, and also saves materials for manufacturing the sealing door 23. At least one first through hole 231 is provided on the grid structure, and the first through hole 231 connects the front and rear sides of the sealing door 23, so that the sealing door 23 is connected front to back, avoiding the force generated by the pressure difference on both sides when the front and back are not connected directly acting on the sealing door 23, resulting in a greatly increased force required for opening and closing the sealing door 23, and an increase in manufacturing cost.

[0119] like Figure 4 and Figure 5 As shown, the sealing flange is located between the annular tube 211 and the sealing end face 19, and a step positioning groove is provided on the side of the sealing flange facing the sealing end face 19, and an end face sealing ring 234 and a sealing pressure ring 235 are provided in the step positioning groove, and the inner ring of the end face sealing ring 234 is sleeved on the step surface of the step positioning groove, and the sealing pressure ring 235 is pressed on the outer ring of the end face sealing ring 234, and the sealing pressure ring 235 is used to ensure that the end face sealing ring 234 can work normally and is not crushed by the sealing end face 19, and the limit sensor 191 is used to detect the proximity of the sealing door 23, and also to prevent the sealing end face 19 and the sealing flange from crushing the end face sealing ring 234.

[0120] like Figure 4 and Figure 5As shown, the valve plate 2 is provided with a second driving mechanism, which includes a plurality of cylinders or hydraulic cylinders 25, and the cylinders or hydraulic cylinders 25 are evenly arranged along the circumference of the sealing door 23, as shown in FIG. Figure 1 and Figure 2 As shown, in this embodiment, 12 cylinders or hydraulic cylinders 25 are evenly distributed, and a mounting stop is provided on the valve plate 2. The cylinder or hydraulic cylinder 25 is fixedly connected to the valve plate 2 through bolts and the mounting stop. The piston rod end of the cylinder or hydraulic cylinder 25 is processed with a groove body and a pin hole, and the end of the pull rod 26 is inserted into the groove body. The end of the pull rod 26 is provided with a head and a pin hole matching the piston rod end of the cylinder or hydraulic cylinder 25. A cylindrical pin 262 is inserted into the pin hole, and the cylindrical pin 262 passes through the head of the pull rod 26, so that the head of the pull rod 26 is hinged to the piston rod end of the cylinder or hydraulic cylinder 25, and the sealing flange is provided with a The cylinder 25 corresponds to the second through hole, and the other end of the pull rod 26 passes through the corresponding second through hole and is connected to a locking nut 261. The air cylinder or hydraulic cylinder 25 pulls the pull rod 26, and the pull rod 26 pulls the sealing door 23 through the locking nut 261. The pull rod 26 is outer-connected with a spring guide sleeve 28, and the spring guide sleeve 28 is outer-connected with a spring 27. The spring 27 is pre-compressed and installed, and the two ends of the spring 27 respectively abut against the sealing flange and the cylinder end of the air cylinder or hydraulic cylinder 25. The sealing flange moves to the right under the action of the pull rod 26 and stops when it abuts against the left end face of the annular tube 211. At this time, the spring guide sleeve 28 can move axially.

[0121] like Figure 1 , Figure 2 , Figures 4 to 7 As shown, the top and bottom of the valve plate 2 are respectively provided with protrusions 24, and the protrusions 24 are installed in cooperation with the mounting grooves on the valve plate 2 through fasteners. The convex part of the protrusion 24 has three working surfaces, and each of the working surfaces is provided with a group of slide plates 241. Each group of the slide plates 241 includes a plurality of slide plates 241, and the slide plates 241 are evenly arranged and installed on the protrusions 24 through fasteners. The protrusions 24 are arranged in the slide grooves 18 to form a sliding guide pair. The slide plates 241 fit in the slide grooves 18. Through the cooperation of the protrusions 24 and the slide grooves 18, the valve plate 2 and the box body 1 are slidably connected. The slide plates 241 are wear-resistant and lubricating linings. In this embodiment, self-lubricating wear-resistant linings are used. When maintaining the valve plate 2, it is only necessary to open the end cover 13 and pull the valve plate 2 out from one side of the end cover 13 along the slide groove 18, which is very convenient.

[0122] like Figures 1 to 4 , Figure 6 , Figure 7As shown, the first driving mechanism 3 includes a lead screw 31, a driver 32, a lead screw bearing seat 33, a nut bearing seat 34, and a rotary encoder 35. The driver 32 is located outside the end cover 13 and is sealed and fixed on the box body 1. The driver 32 is connected to one end of the lead screw 31 through a coupling, and the other end of the lead screw 31 is connected to the rotary encoder 35 through a coupling. The lead screw 31 is installed in the box body 1 through two lead screw bearing seats 33. The lead screw 31 extends from the stop station of the box body 1 to the box body connecting station 16. The lead screw bearing seat 33 supports the lead screw 31. The lead screw 31 is threadedly connected with a lead screw nut, and the lead screw nut is connected to the nut bearing seat 34. The nut bearing seat 34 is connected to the valve plate 2, and the driver 32 is a motor. The rotation of the motor drives the lead screw 31 to rotate. The rotation of the lead screw 31 drives the lead screw nut to reciprocate along the lead screw 31 in a straight line, thereby driving the valve plate 2 to slide in the box body 1. The rotary encoder 35 measures the angular displacement or angular velocity of the rotation of the lead screw 31, and controls the moving distance of the lead screw nut in combination with the pitch of the lead screw 31, so as to accurately control the moving distance and accurate positioning of the valve plate 2, so as to realize that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box connecting station 16 respectively, so that the valve plate 2 closes or conducts the vacuum pipe 01.

[0123] In some specific embodiments, the first driving mechanism 3 is a cylinder system, which includes a driving cylinder, a cylinder body of the driving cylinder is hingedly connected to the box body 1, and a telescopic rod of the driving cylinder is hingedly connected to the valve plate 2. The driving cylinder is a servo cylinder or a cylinder with a built-in linear displacement sensor or a cylinder with a built-in pull-wire displacement sensor, etc., which can accurately control the stroke of the cylinder telescopic rod to achieve accurate control of the position of the valve plate 2 in the box body 1; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; ensuring that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0124] In some specific embodiments, the first driving mechanism 3 is a cylinder system, which includes a driving cylinder, a cylinder body of the driving cylinder is hingedly connected to the box body 1, and a telescopic rod of the driving cylinder is hingedly connected to the valve plate 2. The driving cylinder is a servo cylinder or a cylinder with a built-in linear displacement sensor or a cylinder with a built-in pull-wire displacement sensor, etc., which can accurately control the stroke of the cylinder telescopic rod to achieve accurate control of the position of the valve plate 2 in the box body 1; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; ensuring that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0125] In some specific embodiments, the first driving mechanism 3 is a pulley system, which includes a driving wheel, a driven wheel and a belt, the belt is connected to the driving wheel and the driven wheel, the driving wheel and the driven wheel are connected to the box body 1, the belt is connected to the valve plate 2, the shaft of the driving wheel is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0126] In some specific embodiments, the first driving mechanism 3 is a gear rack system, which includes a gear and a rack meshing therewith, the gear is connected to the housing 1, the rack is connected to the valve plate 2, the shaft of the gear is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the housing 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; and ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the housing connecting station 16 respectively.

[0127] In some specific embodiments, the first driving mechanism 3 is a sprocket chain system, which includes a sprocket and a chain matching therewith, the sprocket is connected to the box body 1, the chain is connected to the valve plate 2, the shaft of the sprocket is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; to ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0128] like Figure 1 and Figure 6 As shown, the piping 4 includes a circular tube 41 and a hose 42. The circular tube 41 is connected to all the air cylinders or hydraulic cylinders 25 at the same time through a pipe joint. A through-box joint is provided on the box body 1. The through-box joint is connected to the hose 42 inside and to the pipe from the air station or hydraulic station outside. The hose 42 is connected to the circular tube 41.

[0129] The vacuum isolation hatch, such as Figure 1 , Figure 4 and Figure 5 As shown, under normal circumstances, the valve plate sealing station 21 is aligned with the box connecting station 16, and under the action of the spring force of the spring 27, the sealing door 23 is pushed toward and abuts against the sealing end face 19, and the end face sealing ring 234 is pressed against the sealing end face 19, so that the front and rear of the box 1 are sealed and isolated, that is, the front and rear vacuum pipes 01 are isolated and in a normally closed state; when it is necessary to connect the vacuum pipe 01, the cylinder or hydraulic cylinder 25 is actuated, and the sealing door 23 is pulled toward the valve plate 2 through the piston rod of the cylinder or hydraulic cylinder 25 and the pull rod 26, the spring 27 is compressed, the sealing door 23 abuts against the pipe end of the annular pipe 211, and the end face sealing ring 234 is away from the sealing end face 19, so that the front and rear sealing of the box 1 is released, and then the first driving mechanism 3 drives the valve plate 2 to slide in the box 1, so that the valve plate sealing station 21 moves to the stop position in the box 1, as shown in FIG. Figure 2 and Figure 7 As shown, at the same time, the valve plate connecting station 22 moves toward the box connecting station 16 and is aligned, so that the vacuum pipe 01 is connected and in an open state.

[0130] The vacuum isolation hatch described in this embodiment is configured to set three independent workstations in the box body 1 and two independent workstations on the valve plate 2, so that the valve plate 2 is disposed as a whole in the box body 1. The end cover 13, the front half box body 11, and the rear half box body 12 of the box body 1 are positioned by stoppers, and the box body seal 14 and the end cover seal 15 are sealed, thereby ensuring the sealing performance of the vacuum isolation hatch and providing a reliable vacuum environment for the vacuum pipeline system. When the valve plate 2 is to be maintained, it is only necessary to open the end cover 13 and pull the valve plate 2 out from one side of the end cover 13 along the slide groove 18, which is extremely convenient. Two independent workstations are arranged on the valve plate 2. The valve plate 2 is driven to move back and forth by the first driving mechanism 3 to realize the reliable switching between the valve plate sealing workstation 21 and the valve plate connecting workstation 22, and complete the connection and sealing closure with the box connecting workstation 16; the second driving mechanism is not required to work, and the end face sealing ring 234 is pressed against the sealing end face 19 only by the spring force provided by the spring 27, so as to realize the normal closure of the vacuum isolation door, which can effectively save the use cost; the protrusion 24 on the valve plate 2 cooperates with the slide groove 18 in the box 1 to form a sliding guide pair, which has safe and reliable guidance, high axial positioning accuracy, and bears the spring 27. The axial sealing force and the pressure difference thrust of the vacuum pipe 01 avoid the problems of small axial bearing capacity and low positioning accuracy of the wheel guide device used in the prior art; the second driving mechanism adopts multiple cylinders or hydraulic cylinders 25, which are evenly arranged along the circumference of the sealing door 23, and the sealing force on the end face sealing ring 234 is uniform along the entire circumference, and the sealing is safe and reliable; the distribution circle diameter and configuration quantity of the cylinder or hydraulic cylinder 25 can be set according to the diameter of the vacuum pipe 01 and the needs, and is suitable for large and super-large vacuum pipe systems; the middle part of the sealing door 23 is designed as a grid structure, which firstly enhances the rigidity of the sealing door 23, is not easy to deform, and has a good sealing effect, and secondly, through the The first through hole 231 allows the sealing door 23 to pass through from front to back, and the sealing door 23 to the box connecting station 16 can be sealed only by the spring force of the spring 27, which avoids the force generated by the pressure difference on both sides directly acting on the sealing door 23 when the front and back are not connected. This can avoid the increase in the force required to open and close the sealing door 23, which requires increasing the spring force provided by the spring 27 and the driving force of the cylinder or hydraulic cylinder 25, and increasing the manufacturing cost. It can also avoid the increase in the force on components such as the end face sealing ring 234 and the sealing door 23, which requires improving or strengthening their rigidity and strength, and increasing the manufacturing cost. The vacuum isolation cabin door has a simple structure, is easy to use, and has a good effect.

[0131] Example 2

[0132] like Figure 8 and Fig. 9As shown, it is a bidirectional normally closed vacuum isolation cabin door, which is different from Example 1 in that, in this embodiment, a set of the sealing structure is respectively arranged on both sides of the valve plate sealing station 21, and the two sealing doors 23 are respectively used to seal the box connecting station 16 of the front half box 11 and the box connecting station 16 of the rear half box 12.

[0133] A vacuum isolation cabin door described in this embodiment respectively seals the two box connecting stations 16 of the box body 1 through two sets of the sealing structures, and has better sealing performance. When a single set of the sealing structures has problems and causes sealing failure, the other set of the sealing structures can still effectively seal and separate the two adjacent vacuum pipes 01, providing a reliable vacuum environment for the vacuum pipeline system; in addition, the spring forces of the springs 27 in the two sets of the sealing structures are opposite, and the spring forces acting on the valve plate 2 can offset each other well, so that the axial thrust of the sliding guide pair composed of the protrusion 24 and the slide groove 18 is greatly reduced or even eliminated. The vacuum isolation cabin door has a simple structure, is easy to use, and has a good effect.

[0134] Example 3

[0135] like Figures 1 to 9 As shown, a method for using a vacuum isolation cabin door according to the present invention uses a vacuum isolation cabin door as described in Example 1 or Example 2, the vacuum pipe 01 on one side of the vacuum isolation cabin door is in a vacuum state, and the vacuum pipe 01 on the other side is in a non-vacuum state, and there is a pressure difference on both sides. The method includes the following steps:

[0136] The action of the air cylinder or hydraulic cylinder 25 overcomes the spring force of the spring 27, and the sealing door 23 is pulled toward the annular tube 211 and away from the sealing end face 19 through the piston rod of the air cylinder or hydraulic cylinder 25 and the pull rod 26. The spring 27 is compressed, and the end face sealing ring 234 is released from contact with the sealing end face 19. The sealing ring slides in the mounting hole until the sealing flange abuts against the end face of the annular tube 211, so that the vacuum pipe 01 on both sides of the vacuum isolation cabin door is released from sealing until the pressure in the vacuum pipe 01 is consistent.

[0137] The driver 32 drives the lead screw 31 to rotate, and the rotation of the lead screw 31 drives the lead screw nut to move linearly from right to left, thereby driving the valve plate 2 to move from right to left along the slide groove 18 in the box body 1. Figure 1 and Figure 2 As shown, the valve plate sealing station 21 enters the stop station of the box body 1, and the valve plate connecting station 22 is aligned with the box body connecting station 16, so that the vacuum pipes 01 on both sides of the vacuum isolation cabin door are connected to meet the passage of the maglev train.

[0138] The vacuum pipe connection method described in this embodiment is that the air cylinder or hydraulic cylinder 25 pulls the sealing door 23, the spring 27 is compressed, and the spring force of the spring 27 is overcome, so that the sealing door 23 is pulled toward and abuts against the end face of the annular tube 211, so that the end face sealing ring 234 is away from the sealing end face 19, the sealing of the vacuum pipe 01 is released, and the pressure inside the vacuum pipe 01 reaches the same level; since the sealing door 23 is provided with the first through hole 231, there is no pressure difference on both sides of the sealing door 23, and the pressure difference of the vacuum pipe 01 acts on the valve plate 2, which is then transmitted to the The connection between the valve plate 2 and the box body 1, that is, the sliding guide pair, is composed of the protrusion 24 and the slide groove 18, with high axial positioning accuracy, and can well bear the axial thrust and pressure difference thrust of the spring 27; then the valve plate 2 is driven by the driver 32 to slide in the box body 1, so that the valve plate sealing station 21 leaves the box body connecting station 16, the valve plate connecting station 22 is aligned with the box body connecting station 16, and the vacuum pipe 01 is connected. The method has simple steps, easy operation, few action steps, can respond quickly, and has good effect.

[0139] Example 4

[0140] like Figures 10 to 17 As shown, a one-way normally open vacuum isolation cabin door comprises a box body 1, a valve plate 2, a first driving mechanism 3 and a pipe 4, which is a normally open door.

[0141] like Figures 10 to 12 As shown, the box body 1 includes a front half box body 11, a rear half box body 12 and an end cover 13. The front half box body 11 and the rear half box body 12 are assembled into a right box body through a stopper, a joint surface and bolts. A sealing groove is processed on the joint surface, and a box body seal 14 is installed therein. The left end surface of the right box body is processed with a stopper and a joint surface for positioning with the end cover 13. The right box body and the end cover 13 are connected by bolts. A sealing groove is processed on the joint surface, and an end cover seal 15 is installed therein. The front half box body 11 and the rear half box body 12 are respectively connected with vacuum pipes 01, and the two vacuum pipes 01 are coaxial and aligned.

[0142] like Figures 10 to 12As shown, the box body 1 is provided with three independent workstations, the middle workstation is a box body connecting workstation 16 connected to the vacuum pipe 01, the left and right workstations are stop workstations for accommodating the valve plate 2, and the box body connecting workstations 16 are distributed on the front and rear sides of the box body 1, that is, one box body connecting workstation 16 is provided on the front half box body 11 and the rear half box body 12 respectively, and the box body connecting workstation 16 is a circular tube with the same inner diameter as the vacuum pipe 01, and the two box body connecting workstations 16 are oppositely and coaxially arranged.

[0143] like Fig.15 As shown, both ends of the box connecting station 16 have flanges, the flange facing the outside of the box 1 is used for sealing the connection to the vacuum pipe 01, and an installation space for the valve plate 2 is provided between the flanges facing the inside of the box 1, and the end face of the flange facing the inside of the box 1 is a sealing end face 19, and a limit sensor 191 is provided on the adjacent surface of the sealing end face 19, and the limit sensor 191 is a proximity switch, a limit switch or other position detection sensor, and the adjacent surface can be the inner annular surface of the flange or the outer annular surface of the flange.

[0144] like Fig.13 As shown, a box mounting platform 17 is provided at the bottom of the circular tube of the box connecting station 16, and the box mounting platform 17 is used to install the magnetic suspension motor bracket.

[0145] like Fig.10 , Fig.11 , Figures 13 to 16 As shown, the inner top surface and the inner bottom surface of the box body 1 are respectively provided with slide grooves 18 from left to right, that is, the slide grooves 18 are arranged along the length direction of the front half box body 11 and the rear half box body 12, and the slide grooves 18 are U-shaped.

[0146] like Fig.10 and Fig.11 As shown, the valve plate 2 is provided with two independent stations, one is a valve plate sealing station 21, and the other is a valve plate connecting station 22. The valve plate connecting station 22 is arranged on the right side of the valve plate 2. The valve plate connecting station 22 is a round tube with the same inner diameter as the box connecting station 16. A valve plate mounting platform 29 is arranged at the bottom of the round tube of the valve plate connecting station 22. The valve plate mounting platform 29 is used to install the magnetic levitation motor bracket. The valve plate sealing station 21 is arranged on the left side of the valve plate 2. A sealing door 23 is provided at the valve plate sealing station 21. The sealing door 23 on the valve plate 2 and the sealing end face 19 on the box 1 cooperate with each other to form a sealing structure.

[0147] like Fig.15 and Fig.16As shown, the valve plate sealing station 21 is welded by an annular tube 211, a tube end flange 212, an internal web and rib plate, and an external web and rib plate, and is an integral structure with the valve plate 2. The annular tube 211 is provided with a mounting hole for mounting the sealing door 23. The sealing door 23 includes a sealing ring and a sealing flange. The sealing flange is connected to the end of the sealing ring. Preferably, the sealing ring and the sealing flange are an integrally formed component. The sealing ring and the sealing flange form a component with an L-shaped cross section. The outer ring surface of the sealing ring is slidably connected to the annular tube 2 In the mounting hole of 11, a mounting groove is provided on the outer ring surface of the sealing ring, in which a radial sealing ring 232 and a guide ring 233 are provided, and the guide ring 233 is provided on both sides of the radial sealing ring 232. The radial sealing ring 232 is tightly attached to the mounting hole, and the guide ring 233 is an easy-to-slide and wear-resistant plate. In this embodiment, a polytetrafluoroethylene plate is used. The radial sealing ring 232 is used to achieve sealing isolation on both sides of the mounting hole, and the guide ring 233 is used to support the sealing door 23 on the mounting hole and protect the radial sealing ring 232.

[0148] like Fig.16 As shown, there is a grid structure inside the sealing ring, and the grid structure enhances the rigidity of the sealing ring, so that the sealing door 23 is not easily deformed and has a good sealing effect, and also saves materials for manufacturing the sealing door 23. At least one first through hole 231 is provided on the grid structure, and the first through hole 231 connects the front and rear sides of the sealing door 23, so that the sealing door 23 is connected front to back, avoiding the force generated by the pressure difference on both sides when the front and back are not connected directly acting on the sealing door 23, resulting in a greatly increased force required for opening and closing the sealing door 23, and an increase in manufacturing cost.

[0149] like Fig.15 and Fig.16 As shown, the sealing flange is located between the pipe end flange 212 and the sealing end face 19, and a step positioning groove is provided on the side of the sealing flange facing the sealing end face 19, and an end face sealing ring 234 and a sealing pressure ring 235 are provided in the step positioning groove, and the inner ring of the end face sealing ring 234 is sleeved on the step surface of the step positioning groove, and the sealing pressure ring 235 is pressed on the outer ring of the end face sealing ring 234, and the sealing pressure ring 235 is used to ensure that the end face sealing ring 234 can work normally and is not crushed by the sealing end face 19, and the limit sensor 191 is used to detect the proximity of the sealing door 23, and also to prevent the sealing end face 19 and the sealing flange from crushing the end face sealing ring 234.

[0150] like Figures 15 to 17As shown, the valve plate 2 is provided with a second driving mechanism, which includes a plurality of cylinders or hydraulic cylinders 25, and the cylinders or hydraulic cylinders 25 are evenly arranged along the circumference of the sealing door 23, as shown in FIG. Fig.10 and Fig.11 As shown, in this embodiment, 12 cylinders or hydraulic cylinders 25 are evenly distributed, and a mounting stop is provided on the valve plate 2. The cylinder or hydraulic cylinder 25 is fixedly connected to the valve plate 2 through bolts and the mounting stop. The piston rod end of the cylinder or hydraulic cylinder 25 is processed with a cylindrical hole-shaped stop. The pull rod 26 is a combination of a spline keypad 263 and a rod body 264. A spline groove matching the spline teeth 281 is processed in the spline keypad 263, and a thread matching the locking nut 261 is processed on the left end of the rod body 264. The right end of the spring guide sleeve 28 is processed with the spline teeth 281 uniformly distributed in the radial direction and matching the spline groove of the spline keypad 263, and the front section of the spline teeth 281 is processed with a stepped cylindrical surface. The pull rod 26 penetrates from the inner hole of the right end of the spring guide sleeve 28 and passes out from the left end. The spline teeth 281 pass through the spline groove of the spline keypad 263. The stepped cylindrical surface of the spline teeth 281 is inserted into the cylindrical hole-shaped stopper at the end of the piston rod of the cylinder or hydraulic cylinder 25 and is tightly attached to the end face of the stopper. The pipe end flange 212 and the The sealing flange is provided with a second through hole and a third through hole corresponding to the cylinder or hydraulic cylinder 25. The other end of the spring guide sleeve 28 passes through the second through hole on the corresponding pipe end flange 212 and is tightly attached to the right side of the sealing flange. The other end of the pull rod 26 passes through the third through hole on the corresponding sealing flange and is connected and locked through the outer locking nut 261. The spring 27 is sleeved on the outer cylindrical surface of the spring guide sleeve 28, and one end of the spring 27 is tightly attached to the left side of the spline 263. The other end of the spring 27 is in close contact with the right side of the pipe end flange 212. The spring 27 is installed in a pre-compression manner. Under the pre-compression force of the spring 27, the pull rod 26 pulls the sealing door 23 to move rightward through the spline 263 and the locking nut 261 at the right end of the pull rod 26, so that the sealing door 23 abuts against the left end face of the pipe end flange 212, and pushes the spring guide sleeve 28 to move rightward and abut against the piston rod stop end face of the cylinder or hydraulic cylinder 25, so that the sealing door 23 is in an open state for a long time. When the cylinder or hydraulic cylinder 25 is working, it pushes the spring guide sleeve 28 to move leftward, and the spring guide sleeve 28 pushes the sealing door 23 to approach the sealing end face 19 until it abuts against the sealing end face 19. The end face sealing ring 234 on the sealing door 23 is in close contact with the sealing end face 19 to achieve a sealed partition between the front and rear two connecting stations 16 of the box body 1, so that the sealing door 23 is in a closed state.

[0151] like Fig.10 , Fig.11, Figures 13 to 16 As shown, the top and bottom of the valve plate 2 are respectively provided with protrusions 24, and the protrusions 24 are installed in cooperation with the mounting grooves on the valve plate 2 through fasteners. The convex part of the protrusion 24 has three working surfaces, and each of the working surfaces is provided with a group of slide plates 241. Each group of the slide plates 241 includes a plurality of slide plates 241, and the slide plates 241 are evenly arranged and installed on the protrusions 24 through fasteners. The protrusions 24 are arranged in the slide grooves 18 to form a sliding guide pair. The slide plates 241 fit in the slide grooves 18. Through the cooperation of the protrusions 24 and the slide grooves 18, the valve plate 2 and the box body 1 are slidably connected. The slide plates 241 are wear-resistant and lubricating linings. In this embodiment, self-lubricating wear-resistant linings are used. When maintaining the valve plate 2, it is only necessary to open the end cover 13 and pull the valve plate 2 out from one side of the end cover 13 along the slide groove 18, which is very convenient.

[0152] like Figures 10 to 12 , Fig.14 As shown, the first driving mechanism 3 includes a lead screw 31, a driver 32, a lead screw bearing seat 33, a nut bearing seat 34, and a rotary encoder 35. The driver 32 is located outside the end cover 13 and is sealed and fixed on the box body 1. The driver 32 is connected to one end of the lead screw 31 through a coupling, and the other end of the lead screw 31 is connected to the rotary encoder 35 through a coupling. The lead screw 31 is installed in the box body 1 through two lead screw bearing seats 33. The lead screw 31 extends from the stop station of the box body 1 to the box body connecting station 16. The lead screw bearing seat 33 supports the lead screw 31. The lead screw 31 is threadedly connected with a lead screw nut, and the lead screw nut is connected to the nut bearing seat 34. The nut bearing seat 34 is connected to the valve plate 2, and the driver 32 is a motor. The rotation of the motor drives the lead screw 31 to rotate. The rotation of the lead screw 31 drives the lead screw nut to reciprocate along the lead screw 31 in a straight line, thereby driving the valve plate 2 to slide in the box body 1. The rotary encoder 35 measures the angular displacement or angular velocity of the rotation of the lead screw 31, and controls the moving distance of the lead screw nut in combination with the pitch of the lead screw 31, so as to accurately control the moving distance and accurate positioning of the valve plate 2, so as to realize that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box connecting station 16 respectively, so that the valve plate 2 closes or conducts the vacuum pipe 01.

[0153] In some specific embodiments, the first driving mechanism 3 is a cylinder system, which includes a driving cylinder, a cylinder body of the driving cylinder is hingedly connected to the box body 1, and a telescopic rod of the driving cylinder is hingedly connected to the valve plate 2. The driving cylinder is a servo cylinder or a cylinder with a built-in linear displacement sensor or a cylinder with a built-in pull-wire displacement sensor, etc., which can accurately control the stroke of the cylinder telescopic rod to achieve accurate control of the position of the valve plate 2 in the box body 1; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; ensuring that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0154] In some specific embodiments, the first driving mechanism 3 is a cylinder system, which includes a driving cylinder, a cylinder body of the driving cylinder is hingedly connected to the box body 1, and a telescopic rod of the driving cylinder is hingedly connected to the valve plate 2. The driving cylinder is a servo cylinder or a cylinder with a built-in linear displacement sensor or a cylinder with a built-in pull-wire displacement sensor, etc., which can accurately control the stroke of the cylinder telescopic rod to achieve accurate control of the position of the valve plate 2 in the box body 1; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; ensuring that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0155] In some specific embodiments, the first driving mechanism 3 is a pulley system, which includes a driving wheel, a driven wheel and a belt, the belt is connected to the driving wheel and the driven wheel, the driving wheel and the driven wheel are connected to the box body 1, the belt is connected to the valve plate 2, the shaft of the driving wheel is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0156] In some specific embodiments, the first driving mechanism 3 is a gear rack system, which includes a gear and a rack meshing therewith, the gear is connected to the housing 1, the rack is connected to the valve plate 2, the shaft of the gear is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the housing 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; and ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the housing connecting station 16 respectively.

[0157] In some specific embodiments, the first driving mechanism 3 is a sprocket chain system, which includes a sprocket and a chain matching therewith, the sprocket is connected to the box body 1, the chain is connected to the valve plate 2, the shaft of the sprocket is connected to the motor and the rotary encoder through a coupling, and the rotary encoder is used to detect and control the position of the valve plate 2; a linear displacement sensor can also be directly arranged between the box body 1 and the valve plate 2 to accurately detect and control the position of the valve plate 2; to ensure that the valve plate connecting station 22 and the valve plate sealing station 21 can be accurately aligned with the box body connecting station 16 respectively.

[0158] like Fig.10 and Fig.14 As shown, the piping 4 includes a circular tube 41 and a hose 42. The circular tube 41 is connected to all the air cylinders or hydraulic cylinders 25 at the same time through a pipe joint. A through-box joint is provided on the box body 1. The through-box joint is connected to the hose 42 inside and to the pipe from the air station or hydraulic station outside. The hose 42 is connected to the circular tube 41.

[0159] The vacuum isolation hatch, such as Fig.10 , Fig.13 and Fig.14 As shown, under normal circumstances, the valve plate connecting station 22 is aligned with the box connecting station 16, and the valve plate sealing station 21 is located at the stop station of the box 1, so that the front and rear vacuum pipes 01 are connected to the valve plate connecting station 22 through the box connecting station 16. The sealing door 23 of the valve plate sealing station 21 is pulled toward the pipe end flange 212 through the pull rod 26 and abuts against the left end face of the pipe end flange 212 under the thrust generated by the pre-compression force of the spring 27. The end face sealing ring 234 is away from the sealing end face 19, and the vacuum isolation door is in a normally open state. When it is necessary to seal and isolate the front and rear vacuum pipes 01, the first driving mechanism 3 drives the valve plate 2 to slide in the box 1, so that the valve plate sealing station 21 moves toward the box connecting station 16 and aligns, as shown in FIG. Fig.11As shown, at the same time, the valve plate connecting station 22 moves to the stop station of the box body 1, so that the front and rear vacuum pipes 01 are separated by the valve plate 2, and then the cylinder or hydraulic cylinder 25 is actuated, and the sealing door 23 is pushed to approach the sealing end face 19 through the piston rod of the cylinder or hydraulic cylinder 25 and the spring guide sleeve 28 until it abuts against the sealing end face 19, and the end face sealing ring 234 is attached to the sealing end face 19, so that the sealing door 23 is in a closed state, and at the same time, the sealing door 23 pushes the spring 27 to be compressed to the left through the flower key 263; whether the sealing door 23 is closed in place can be detected and controlled by the limit sensor 191 to avoid the sealing door 23 and the sealing end face 19 colliding and damaging the end face sealing ring 234. When sealing is not required, the air cylinder or hydraulic cylinder 25 stops working and releases pressure. The sealing door 23 pushes the pull rod 26 to move to the right under the thrust of the compression force released by the spring 27. The locking nut 261 pulls the sealing door 23 to move to the right until it abuts against the left end face of the pipe end flange 212. The sealing door 23 pushes the spring guide sleeve 28 to move to the right. The spring guide sleeve 28 pushes the piston rod of the air cylinder or hydraulic cylinder 25 to move to the right until it returns to the initial position of the piston rod. The sealing door 23 is in a normally open state. At the same time, the first driving mechanism 3 drives the valve plate 2 to slide in the box body 1, so that the valve plate sealing station 21 moves toward the box body connecting station 16 and aligns it, so that the vacuum isolation cabin door is in a normally open state.

[0160] The vacuum isolation hatch described in this embodiment is provided with three independent workstations in the box body 1 and two independent workstations on the valve plate 2, so that the valve plate 2 is arranged as a whole in the box body 1, and the end cover 13, the front half box body 11, and the rear half box body 12 of the box body 1 are positioned by stoppers, and the box body seal 14 and the end cover seal 15 are sealed, so as to ensure the sealing performance of the vacuum isolation hatch and provide a reliable vacuum environment for the vacuum pipeline system; and when the valve plate 2 is maintained, it is only necessary to open the end cover 13 and pull the valve plate 2 out from one side of the end cover 13 along the slide groove 18, which is very convenient; a stopper 13 is provided on the valve plate 2 The valve plate 2 is driven to move back and forth by the first driving mechanism 3, so as to realize the reliable switching between the valve plate sealing position 21 and the valve plate communicating position 22, and complete the communication and sealing closure with the box communicating position 16; the second driving mechanism is not required to work, and the sealing door 23 is attached to the valve plate 2 only by the spring pre-compression force provided by the spring 27, so as to realize the normal opening of the vacuum isolation door, which can effectively save the use cost; the protrusion 24 on the valve plate 2 cooperates with the slide groove 18 in the box 1 to form a sliding guide pair, which has safe and reliable guidance, high axial positioning accuracy, and bears the axial sealing force of the first driving mechanism and the vacuum pipe 0 1, avoiding the problems of small axial bearing force and low positioning accuracy of the wheel-type guide device used in the prior art; the second driving mechanism adopts multiple cylinders or hydraulic cylinders 25, which are evenly arranged along the circumference of the sealing door 23, and the sealing force on the end face sealing ring 234 is uniform along the entire circumference, and the sealing is safe and reliable; the distribution circle diameter and configuration quantity of the cylinder or hydraulic cylinder 25 can be set according to the diameter of the vacuum pipe 01 and the needs, and is suitable for large and super-large vacuum pipe systems; the middle part of the sealing door 23 is designed as a grid structure, firstly, the rigidity of the sealing door 23 is enhanced, it is not easy to deform, and the sealing effect is good, and secondly, the sealing door 23 is connected from front to back through the first through hole 231, The sealing of the box connecting station 16 by the sealing door 23 can be achieved only by the driving force of the smaller air cylinder or hydraulic cylinder 25, which avoids the force generated by the pressure difference on both sides when the front and back are not connected directly to the sealing door 23, and can avoid the increase of the force required for opening and closing the sealing door 23. It is necessary to increase the spring pre-compression force provided by the spring 27 to open the sealing door 23 and the driving force of the cylinder or hydraulic cylinder 25 to close the sealing door 23, which increases the manufacturing cost. It can also avoid the increase of force on components such as the end face sealing ring 234 and the sealing door 23, which requires to improve or strengthen their stiffness and strength, increasing the manufacturing cost. The vacuum isolation cabin door has a simple structure, is easy to use and has a good effect.

[0161] Example 5

[0162] like Figures 18 to 20 As shown, a bidirectional normally open vacuum isolation cabin door according to the present invention is different from Example 4 in that, in this embodiment, two sets of the sealing structures are provided on the sealing station 21 of the valve plate 2, and the two sealing doors 23 are respectively located on both sides of the valve plate sealing station 21, and the two sealing doors 23 are respectively used to seal the box connecting station 16 of the front half box 11 and the box connecting station 16 of the rear half box 12.

[0163] A vacuum isolation cabin door described in this embodiment, when it needs to be closed, is sealed separately on the two box connecting stations 16 of the box body 1 through two sets of the sealing structures, and has better sealing performance. When a single set of the sealing structures has problems and causes the seal to fail, the other set of the sealing structures can still effectively seal and separate the two adjacent vacuum pipes 01, providing a reliable vacuum environment for the vacuum pipeline system; in addition, the driving forces of the first driving mechanisms in the two sets of the sealing structures are opposite, and the driving reaction forces acting on the valve plate 2 can offset each other well, so that the axial thrust of the sliding guide pair composed of the protrusion 24 and the slide groove 18 is greatly reduced or even eliminated. The vacuum isolation cabin door has a simple structure, is easy to use, and has a good effect.

[0164] Example 6

[0165] like Figures 10 to 20 As shown, a method for using a vacuum isolation cabin door according to the present invention uses a vacuum isolation cabin door as described in Example 4 or Example 5, and the two vacuum pipes 01 on both sides of the vacuum isolation cabin door are both in a vacuum state or in a non-vacuum state, and there is no pressure difference on both sides. The method includes the following steps:

[0166] The driver 32 drives the lead screw 31 to rotate, and the rotation of the lead screw 31 drives the lead screw nut to move linearly from left to right, thereby driving the valve plate 2 to move from left to right along the slide groove 18 in the box body 1. Fig.10 and Fig.11 As shown, the valve plate connecting station 22 enters the stop station of the box body 1, and the valve plate sealing station 21 is aligned with the box body connecting station 16, so that the vacuum pipe 01 on both sides of the vacuum isolation door is isolated by the valve plate 2;

[0167] The action of the air cylinder or hydraulic cylinder 25 overcomes the pre-compression force of the spring 27, and pushes the sealing door 23 outward close to the box sealing end face 19 and away from the pipe end flange 212 through the piston rod of the air cylinder or hydraulic cylinder 25, the spring guide sleeve 28 and the pull rod 26. The spring 27 is compressed, and the end face sealing ring 234 is tightly attached to the sealing end face 19. The sealing ring slides in the mounting hole of the annular tube 211 until the sealing flange triggers the limit sensor 191, so that the vacuum pipes 01 on both sides of the vacuum isolation cabin door are sealed and isolated, and the two vacuum pipes 01 can be pressure-regulated separately.

[0168] In the present embodiment, a vacuum pipeline closing method is described, wherein the driver 32 drives the valve plate 2 to slide in the box body 1, so that the valve plate sealing station 21 is aligned with the box body connecting station 16, the valve plate connecting station 22 leaves the box body connecting station 16, and the vacuum pipeline 01 is cut off; then, the cylinder or hydraulic cylinder 25 is actuated to overcome the pre-compression force of the spring 27, and the end face sealing ring 234 is pressed against the sealing end face 19 by the driving force of the cylinder or hydraulic cylinder 25, and the vacuum pipeline 01 is sealed. Sealed and isolated, since the sealing door 23 is provided with the first through hole 231, there is no pressure difference on both sides of the sealing door 23, and the pressure difference of the vacuum pipe 01 acts on the valve plate 2, and is then transmitted to the connection between the valve plate 2 and the box body 1, that is, the sliding guide pair. The sliding guide pair is composed of the protrusion 24 and the slide groove 18, and has high axial positioning accuracy. It can well bear the axial thrust and pressure difference thrust of the cylinder or hydraulic cylinder 25. The method has simple steps, convenient operation, few action steps, can respond quickly, and has good effect.

[0169] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum isolation door, comprising a box body (1), a valve plate (2) and a first driving mechanism (3), characterized in that: The box body (1) is provided with end flanges on both sides, which are respectively sealed and connected to the vacuum pipes (01). The two vacuum pipes (01) are coaxially arranged. The top and bottom of the valve plate (2) are respectively provided with protrusions (24). The box body (1) is provided with a slide groove (18). The protrusion (24) is arranged in the slide groove (18) to form a sliding guide pair. The first driving mechanism (3) drives the valve plate (2) to slide in the box body (1). The plate surface of the valve plate (2) can move to or away from the two vacuum pipes. A sealing end face (19) is provided in the box body (1), a second driving mechanism is provided on the valve plate (2), the second driving mechanism is connected to the sealing door (23), the sealing door (23) is provided with an end face sealing ring (234) and a spring (27), the two ends of the spring (27) act on the sealing door (23) and the cylinder body of the cylinder or hydraulic cylinder (25) respectively, the spring (27) is pre-compressed and installed, the sealing end face (19) and the sealing door (23) cooperate with each other to form a sealing structure; The spring force of the spring (27) causes the end face sealing ring (234) to be pressed against the sealing end face (19) to form a normally closed structure, and the second driving mechanism can drive the sealing door (23) to compress the spring (27) and move away from the sealing end face (19); a pull rod (26) is provided on the valve plate (2), the pull rod (26) is connected to the sealing door (23), a spring guide sleeve (28) is connected to the outer sleeve of the pull rod (26), and the spring (27) is sleeved outside the spring guide sleeve (28); the second driving mechanism includes a plurality of air cylinders or hydraulic cylinders (2 5), the air cylinder or hydraulic cylinder (25) is evenly distributed along the circumference of the sealing door (23), and the cylinder body of the air cylinder or hydraulic cylinder (25) is connected to the valve plate (2); one end of the pull rod (26) is connected to the piston rod end of the air cylinder or hydraulic cylinder (25), and the two ends of the spring (27) act on the sealing door (23) and the cylinder body end of the air cylinder or hydraulic cylinder (25) respectively; the piston rod end of the air cylinder or hydraulic cylinder (25) is provided with a groove body, and the end of the pull rod (26) extends into the groove body and is hinged with the piston rod end of the air cylinder or hydraulic cylinder (25); Alternatively, the two ends of the spring (27) act on the end faces of the pipe end flange (212) and the spline (263) respectively, and the sealing door (23) is pressed tightly against the pipe end flange (212) by the spring force of the spring (27), so that a gap exists between the plane where the end face sealing ring (234) and the sealing end face (19) are located, forming a normally open structure, and the second driving mechanism can drive the sealing door (23) to compress the spring (27) and abut against the sealing end face (19), so that the end face sealing ring (234) is in contact with the sealing end face (19).

2. The vacuum isolation door according to claim 1, characterized in that: A plurality of springs (27) are evenly distributed along the circumference of the sealing door (23).

3. The vacuum isolation door according to claim 2, characterized in that: When the normally open structure is adopted, a pull rod (26) is provided on the valve plate (2), the pull rod (26) is connected to the sealing door (23), a spring guide sleeve (28) is connected to the outer surface of the pull rod (26), and the spring (27) is sleeved outside the spring guide sleeve (28).

4. The vacuum isolation door according to claim 3, characterized in that: The second driving mechanism comprises a plurality of air cylinders or hydraulic cylinders (25), wherein the air cylinders or hydraulic cylinders (25) are evenly distributed along the circumference of the sealing door (23), and the cylinder bodies of the air cylinders or hydraulic cylinders (25) are connected to the valve plate (2).

5. The vacuum isolation door according to claim 4, characterized in that: The valve plate (2) is provided with a pipe end flange (212), and the pipe end flange (212) is located on one side of the sealing door (23). The pull rod (26) includes a flower keypad (263) and a rod body (264), and the flower keypad (263) and the rod body (264) form an integrated structure. The spring guide sleeve (28) is sleeved outside the rod body (264), and the spring (27) is sleeved outside the spring guide sleeve (28).

6. The vacuum isolation door according to claim 5, characterized in that: The spline keypad (263) is provided with a spline groove matching the spring guide sleeve (28); one end of the spring guide sleeve (28) is provided with a spline tooth (281) matching the spline groove of the spline keypad (263); the spline tooth (281) passes through the spline groove of the spline keypad (263) and abuts against the piston rod end of the cylinder or hydraulic cylinder (25) and is matched and connected with the piston rod end; the other end of the spring guide sleeve (28) passes through and is slidably connected to the pipe end flange (212) and abuts against the sealing door (23); One end of the spring (27) abuts against the pipe end flange (212), and the other end abuts against the flower key (263). Under the action of the spring force of the spring (27), the sealing door (23) pushes the pull rod (26) to pull the sealing door (23) toward the pipe end flange (212) and away from the sealing end face (19), forming a normally open structure. The piston rod of the cylinder or hydraulic cylinder (25) can push the spring guide sleeve (28) to move axially and push the sealing door (23) to move toward the sealing end face (19).

7. The vacuum isolation door according to claim 4, characterized in that: The invention also comprises a piping (4), wherein the piping (4) comprises a circular tube (41) and a hose (42), wherein the circular tube (41) is connected to all the air cylinders or hydraulic cylinders (25) at the same time, and the box body (1) is provided with a box-penetrating joint, wherein the box-penetrating joint is connected to the hose (42) inside and to the air station or hydraulic station outside, and the hose (42) is connected to the circular tube (41).

8. The vacuum isolation door according to claim 1, characterized in that: The sealing door (23) on which the end face sealing ring (234) is arranged is provided with a stepped positioning groove, and the end face sealing ring (234) is arranged in the stepped positioning groove.

9. The vacuum isolation door according to claim 8, characterized in that: The inner ring of the end face sealing ring (234) is sleeved on the step surface of the step positioning groove, and the outer ring of the end face sealing ring (234) is matched with a sealing pressure ring (235).

10. The vacuum isolation door according to claim 8, characterized in that: The end face sealing ring (234) is a trapezoidal sealing ring, an O-shaped sealing ring or other sealing rings.

11. The vacuum isolation door according to claim 1, characterized in that: A limit sensor (191) is provided on the adjacent surface of the sealing end surface (19), and the limit sensor (191) is a proximity switch, a limit switch or other position detection sensor.

12. The vacuum isolation door according to claim 1, characterized in that: At least one first through hole (231) is provided on the sealing door (23), and the first through hole (231) is connected to two sides of the sealing door (23).

13. The vacuum isolation door according to claim 12, characterized in that: The sealing door (23) comprises a sealing ring and a sealing flange, wherein the sealing flange is connected to the end of the sealing ring, and the sealing ring and the sealing flange form a component with an L-shaped cross-section. The valve plate (2) is provided with a mounting hole for mounting the sealing door (23), and the outer ring surface of the sealing ring is slidably connected to the mounting hole. The outer ring surface of the sealing ring is provided with a mounting groove, and a radial sealing ring (232) and a guide ring (233) are provided in the mounting groove. The radial sealing ring (232) is tightly attached to the mounting hole.

14. The vacuum isolation door according to claim 13, characterized in that: A grid structure is provided inside the sealing ring, and the first through hole (231) is provided on the grid structure.

15. The vacuum isolation door according to claim 1, characterized in that: The convex portion of the convex block (24) has three working surfaces, each of which is provided with a group of slide plates (241), each group of slide plates (241) includes a plurality of slide plates, and the slide plates (241) are fitted in the slide groove (18).

16. The vacuum isolation door according to claim 1, characterized in that: The first driving mechanism (3) is a screw system, an oil cylinder system, an air cylinder system, a pulley system, a gear rack system or a sprocket chain system, wherein the fixed parts of the screw system, the oil cylinder system, the air cylinder system, the pulley system, the gear rack system or the sprocket chain system are connected to the box body (1), and the moving parts of the screw system, the oil cylinder system, the air cylinder system, the pulley system, the gear rack system or the sprocket chain system are connected to the valve plate (2).

17. The vacuum isolation hatch according to claim 16, characterized in that: The screw system comprises a screw (31) and a driver (32), wherein the driver (32) is located outside the housing (1) and is sealed and fixed on the housing (1), the screw (31) is connected to the housing (1), the driver (32) is connected to one end of the screw (31) and can drive the screw (31) to rotate, the screw (31) is connected to a screw nut, the screw nut is connected to the valve plate (2), and the screw (31) is arranged along the sliding direction of the valve plate (2).

18. The vacuum isolation door according to claim 17, characterized in that: The lead screw system further comprises a rotary encoder (35), wherein the rotary encoder (35) is connected inside the housing (1), and the rotary encoder (35) is connected to the other end of the lead screw (31).

19. The vacuum isolation door according to claim 1, characterized in that: The box body (1) comprises a front box body (11), a rear box body (12) and an end cover (13); the front box body (11) and the rear box body (12) are hermetically connected, and a box body seal (14) is provided on the joint surface; the same end of the front box body (11) and the rear box body (12) is hermetically connected to the end cover (13), and an end cover seal (15) is provided on the joint surface; the box body seal (14) and the end cover seal (15) are strip seals or plate seals.

20. The vacuum isolation door according to any one of claims 1 to 19, characterized in that: The box body (1) is provided with three independent workstations in sequence, the workstation in the middle is a box body connecting workstation (16) connected to the vacuum pipe (01), and both sides of the box body connecting workstation (16) are respectively stay workstations for accommodating the valve plate (2). The box body connecting workstation (16) is distributed on the front and rear sides of the box body (1) and is coaxially arranged. The box body connecting workstation (16) is a circular tube with the same inner diameter as the vacuum pipe (01), and the sealing end surface (19) is arranged on the side of the box body connecting workstation (16) facing the valve plate (2).

21. The vacuum isolation door according to claim 20, characterized in that: The valve plate (2) is provided with two independent workstations in sequence, one being a valve plate sealing workstation (21) and the other being a valve plate connecting workstation (22). The valve plate connecting workstation (22) is a round tube having the same inner diameter as the box connecting workstation (16). The valve plate sealing workstation (21) is provided with the sealing door (23).

22. A two-way sealed vacuum isolation door, characterized in that: It comprises a vacuum isolation cabin door as described in any one of claims 1 to 21, wherein a sealing door (23) is respectively arranged on both sides of the valve plate sealing station (21), and the two sealing doors (23) are respectively used to seal the corresponding vacuum pipes (01).

23. A method for using a vacuum isolation hatch, characterized in that: Using the vacuum isolation door according to any one of claims 1 to 21 or the two-way sealed vacuum isolation door according to claim 22, the method comprises: When the vacuum isolation cabin door is normally closed, the second driving mechanism pulls the sealing door (23) to overcome the spring force of the spring (27), the end face sealing ring (234) is pulled away from the sealing end face (19), the seal between the two vacuum pipes (01) on both sides of the box body (1) is released, and there is no pressure difference; the first driving mechanism (3) drives the valve plate (2) to slide in the box body (1), the valve plate (2) and the sealing door (23) are away from the two vacuum pipes (01), and the two vacuum pipes (01) are connected; When the vacuum isolation cabin door is normally open, the first driving mechanism (3) drives the valve plate (2) to slide in the box body (1), and the valve plate (2) and the sealing door (23) are close to the two vacuum pipes (01), and the two vacuum pipes (01) are separated; the second driving mechanism pushes the sealing door (23) to overcome the spring force of the spring (27), and the end face sealing ring (234) is pushed to fit the sealing end face (19), so that the two vacuum pipes (01) on both sides of the box body (1) are sealed and isolated.

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