CN219707422U - Vacuum envelope removes sealing door - Google Patents

Abstract

The utility model relates to the technical field of packaging machines, in particular to a movable sealing door for a vacuum sealing bag, which comprises a door frame, an outer frame, a pair of movable doors, a door body traction moving mechanism, a pair of door body lateral pressing assemblies, a door body upper pressing assembly and a door body lower pressing assembly, wherein the door frame is arranged on a vacuum sealing chamber of an automatic packaging machine and used for enabling a ton bag to go in and out, the outer frame is fixedly arranged on the periphery of the door frame, the pair of movable doors are movably arranged in the outer frame and used for sealing the door frame, the door body traction moving mechanism is arranged on the outer frame and used for driving the pair of movable doors to open and close, the pair of door body lateral pressing assemblies are arranged on the left side and the right side of the outer frame and used for tightly pressing and sealing butt joint door seams of the pair of the movable doors when the movable doors are closed, the door body upper pressing assemblies are arranged on the upper end faces of the door frame and the lower pressing assemblies are arranged on the lower end faces of the outer frame and used for tightly sealing the pair of the movable doors after the movable doors are closed. The utility model realizes the reliable opening and closing of the movable sealing door of the vacuum envelope.

Description

Vacuum envelope removes sealing door

Technical Field

The utility model relates to the technical field of packaging machines, in particular to a movable sealing door for a vacuum envelope.

Background

A quantitative packing scale (also called a ton bag packing machine) is a packing device for quantitative packing of solid fluid state (granular materials or powder materials). The quantitative packing scale in the current market mostly adopts a semi-automatic packing working mode, and the bag needs to be manually taken, opened and hung in advance during operation, and after the bag is hung on a packing machine, quantitative feeding is automatically carried out by the packing machine, and after the feeding is finished, the ton bag filled with the material is transferred to a conveyor and then is sent to the next station for the sealing operation of the bag opening.

However, the semiautomatic packing machine has the following problems in use: in the packaging process, the opening time of the ton bag is long after the material is filled, on one hand, the raw materials are easy to be polluted by air, and therefore the performance of the raw materials is possibly reduced; on the other hand, dust possibly generated in the feeding and packaging process also pollutes the surrounding environment, and the environment friendliness is poor. Secondly, for some special industries, such as lithium battery material industry, the lithium battery material is high in price, so that more severe requirements are put on the accuracy of quantitative packaging, and the existing packaging machine cannot meet the requirements of high-accuracy packaging; in addition, the adoption of the semi-automatic packaging machine increases labor cost and reduces packaging efficiency.

Therefore, it is necessary to develop a solid fluid full-automatic packaging machine specifically to solve the above problems, so that the full-automatic packaging machine can realize full-automatic operations of the processes of bag taking, bag opening, bag covering, bag clamping, weighing, loading, sealing, dust removing and the like.

At present, a semi-automatic ton bag packaging machine cannot realize automatic vacuum bag sealing operation of a ton bag opening after feeding, and one key technology for realizing the automatic vacuum bag sealing operation is to develop a movable sealing door matched with a vacuum packaging chamber, so that ton bags can be automatically transported to the vacuum packaging chamber for vacuumizing according to the requirement of automatic packaging operation, and good sealing performance of the vacuum packaging chamber is ensured.

Disclosure of Invention

In order to solve the problems, the utility model provides a movable sealing door for a vacuum sealing bag, which aims to realize reliable sealing of a vacuum sealing chamber and reliable opening and closing of the movable sealing door for the vacuum sealing bag during full-automatic vacuum sealing bag operation. The specific technical scheme is as follows:

the utility model provides a vacuum envelope removes sealing door, is including setting up the door frame that is used for ton bag business turn over on automatic packaging machine's vacuum packaging room, fixed setting is in the peripheral outer frame of door frame, remove the setting and be in be used for sealing in the outer frame a pair of dodge gate of door frame, set up on the outer frame be used for driving a pair of dodge gate open and the door body traction movement mechanism that closes, set up in the left and right sides position of outer frame be used for when the dodge gate closes a pair of dodge gate butt joint door seam top tight sealed a pair of door body side direction roof pressure subassembly, set up in the upper end position of outer frame be used for after the dodge gate closes with a pair of dodge gate compress tightly the door body on sealing on the door frame terminal surface and lean on the subassembly under the door body that sets up the lower extreme position of outer frame is used for after the dodge gate closes a pair of dodge gate compress tightly sealing on the door frame terminal surface.

Preferably, the outer frame comprises an upper cross beam, a lower cross beam and a pair of vertical connecting beams connected between two ends of the upper cross beam and the lower cross beam; a pair of linear guide rails are fixed at the left side and the right side of the lower end face of the upper cross beam, a door body hanging mechanism is correspondingly arranged between the pair of linear guide rails and the upper end faces of the pair of movable doors, the door body hanging mechanism comprises a pair of movable sliding blocks arranged on the linear guide rails, a hinged support mounting plate is connected between the pair of movable sliding blocks, at least more than two upper hinged supports are arranged on the lower end face of each hinged support mounting plate, more than two lower hinged supports are correspondingly arranged on the upper end face of each movable door, a swinging block is correspondingly connected between the upper hinged supports and the lower hinged supports, the upper parts of the swinging blocks are in rotary connection with the upper hinged supports through upper hinged shafts, and the lower parts of the swinging blocks are in rotary connection with the lower hinged supports through lower hinged shafts; and a swinging plane formed by the swinging direction of the swinging block is perpendicular to the end face of the door frame.

In the utility model, a pair of channel steels are arranged at left and right positions of the upper end face of the lower cross beam of the outer frame, and the lower end parts of the door bodies of the pair of movable doors are correspondingly arranged in the pair of channel steels in a moving way.

The door body traction moving mechanism comprises a synchronous belt which is arranged at the upper part of the outer frame and positioned above the pair of moving doors, and a synchronous belt connecting arm which is connected with the synchronous belt is arranged on the hinged support mounting plate; the hinged support mounting plate used for connecting one of the pair of movable doors is connected with one side belt body of the synchronous belt through the synchronous belt connecting arm, and the hinged support mounting plate used for connecting the other of the pair of movable doors is connected with the other side belt body of the synchronous belt through the synchronous belt connecting arm, so that the pair of movable doors can be opened or closed; the synchronous belt comprises a synchronous belt body, wherein one side belt body of the synchronous belt and the other side belt body of the synchronous belt are two side belt bodies with opposite moving directions when the synchronous belt works.

Preferably, the number of the synchronous belt connecting arms is one pair and the synchronous belt connecting arms are respectively arranged at two ends of the hinged support mounting plate.

In the utility model, a servo speed reducing motor for driving the synchronous belt to move is arranged on the outer frame.

The door body lateral jacking component comprises a door body closing enclasping cylinder and an enclasping support, wherein the door body closing enclasping cylinder and the enclasping support are respectively fixed on a side frame of a vacuum packaging chamber, an enclasping arm is arranged on the enclasping support through a hinge shaft in a rotating mode, a connecting rod is arranged at the front end of a piston rod of the door body closing enclasping cylinder through the hinge shaft in a rotating mode, the enclasping arm is in rotating connection with the connecting rod through the hinge shaft, and an enclasping block used for jacking the outer side face of a moving door when the enclasping arm rotates is arranged at the front end of the enclasping arm.

The enclasping arm is arranged in a retracted mode relative to the movable door in an initial state so as to prevent interference when the movable door is opened; after the movable door is closed (closed), the holding arm holds the outer side surface of the movable door by rotating around the hinge shaft on the holding support, so that the closed clamping of the movable door is realized.

Preferably, the enclasping block is a polyurethane enclasping block.

The upper pressing assembly of the door body comprises a pressing crank arm connected to the swinging block and a crank arm operation cylinder fixed on the upper cross beam and used for driving the pressing crank arm to rotate around an upper hinge shaft on the upper hinge seat, and a pressing roller used for pressing the cantilever end of the pressing crank arm is arranged at the end part of a piston rod of the crank arm operation cylinder.

Preferably, the lower end face of each hinged support mounting plate is provided with three upper hinged supports, and the pressing crank arm is arranged on the swinging block connected with the upper hinged support in the middle of the three upper hinged supports.

The door body downward pressing leaning component comprises a door body tensioning cylinder fixed on the lower beam and a strip-shaped pulling plate vertically connected to the front end of a piston rod of the door body tensioning cylinder, wherein a hook plate is vertically arranged at the front part of the strip-shaped pulling plate, a neutral gear is arranged between a pair of channel steel on the outer frame lower beam, the strip-shaped pulling plate is positioned between the neutral gears of the pair of channel steel, and the hook plate is positioned outside the door body at the lower end of the movable door.

Preferably, the number of the door body tensioning cylinders provided for each movable door is one pair.

In the utility model, a door body closing sealing structure is arranged on the side surfaces of the pair of movable doors, the door body closing sealing structure comprises a caulking groove arranged on the closing side surface of one of the pair of movable doors along the up-down direction, a convex rib arranged on the closing side surface of the other of the pair of movable doors along the up-down direction, and a pair of strip-shaped rubber gaskets arranged between the closing side surfaces of the pair of movable doors along the up-down direction and respectively arranged on two sides of the convex rib, and the convex rib of the pair of movable doors is embedded in the caulking groove when the pair of movable doors are closed.

Preferably, an edge sealing strip is arranged on the surface, which is contacted with the door frame of the vacuum packaging chamber, of the movable door along the periphery.

According to the utility model, the door frame comprises a rear door frame and a front door frame which are arranged on the vacuum packaging chamber according to the conveying direction of the ton bag, and the rear door frame and the front door frame are respectively provided with the vacuum packaging bag moving sealing door.

In the utility model, the lower cross beam of the outer frame is connected with the bottom frame of the vacuum packaging chamber; the upper cross beam of the outer frame is connected with the top frame of the vacuum packaging chamber.

The application method of the utility model is as follows:

after the material is fed on the host machine of the automatic packaging machine, the ton bags (the turnover tray is placed on a weighing and rechecking conveying workbench on the host machine) are pushed onto a transition roller conveying table at the rear door of the vacuum packaging chamber by a ton bag pushing device (a tray pushing cylinder) together with the turnover tray, at the moment, the rear side moving sealing door of the vacuum packaging chamber is opened under the action of a door body traction moving mechanism, the ton bags are further pushed onto a roller conveying frame in the vacuum packaging chamber, then the rear side moving sealing door is closed, the vacuum packaging chamber is vacuumized, automatic heat sealing bag sealing operation of the ton bag opening is carried out by a heat sealing bag sealing device arranged in the vacuum packaging chamber after the heat sealing bag is completed, and the front side moving sealing door and the rear side moving sealing door are opened, so that the ton bags are output from the front door of the vacuum packaging chamber through the pushing device.

The beneficial effects of the utility model are as follows:

firstly, the outer frame is specially arranged on the periphery of the door frame of the vacuum packaging chamber, the upper part of the movable door is movably hung on the linear guide rail through the door body hanging mechanism, the lower part moving gap of the movable door is arranged in the channel steel, and the special structure of the door body hanging mechanism can enable the door body to obtain a moving degree of freedom close to or far from the door frame, so that friction resistance between the door body and the door frame during closing and opening can be effectively eliminated, damage to sealing elements on the door body is avoided, and the use reliability and the service life of the movable door under the working condition of frequent opening and closing are improved.

Secondly, according to the vacuum envelope movable sealing door, good door body involution sealing is realized between a pair of movable doors through the door body involution sealing structure and the door body lateral jacking component which are specially designed.

Third, according to the vacuum envelope movable sealing door disclosed by the utility model, the upper end of the outer frame and the lower end of the outer frame are respectively provided with the door body upper pressing component and the door body lower pressing component, and the door body can be strongly pressed on the end face of the door frame at the movable door, so that the closing and sealing reliability of the movable door is improved.

Fourth, the vacuum envelope movable sealing door provided by the utility model has the advantages that the door body traction moving mechanism adopts the synchronous belt transmission structure, and the pair of movable doors are respectively connected to the two belt bodies with opposite moving directions of the synchronous belt, so that the synchronous opening and closing of the pair of movable doors are realized, and the vacuum envelope movable sealing door is simple in structure and good in reliability.

Drawings

FIG. 1 is a schematic structural view of the present utility model;

FIG. 2 is a schematic view of the three-dimensional structure of FIG. 1;

FIG. 3 is a schematic view (partial view) of the portion of FIG. 2 that involves a door hanging mechanism and a door upper biasing assembly;

FIG. 4 is a schematic diagram of the structure of the turning surface of FIG. 2;

FIG. 5 is a schematic view (partial view) of the structure of FIG. 4 involving a door body hold-down assembly;

FIG. 6 is a schematic view of a structure in which the vacuum envelope moving seal doors are arranged on the front door frame and the rear door frame of the vacuum envelope chamber, and the door body side propping assemblies arranged on the side frames are used for realizing the closing and propping;

FIG. 7 is an enlarged partial view of FIG. 6;

FIG. 8 is a schematic view of a door body apposition seal structure;

fig. 9 is a schematic diagram of a frame structure of the vacuum packaging chamber.

In the figure: 6001. vacuum packaging room, 6002, door frame, 6003, outer frame, 6004, moving door, 6005, door body traction moving mechanism, 6006, door body side pressing assembly, 6007, door body upper pressing assembly, 6008, door body lower pressing assembly, 6009, upper beam, 6010, lower beam, 6011, vertical connecting beam, 6012, linear guide, 6013, door body hanging mechanism, 6014, moving slide, 6015, hinge mounting plate, 6016, upper hinge seat, 6017, lower hinge seat, 6018, swinging block, 6019, upper hinge shaft, 6020, lower hinge shaft, 6021, channel steel, 6022, timing belt, 6023, timing belt connecting arm, 6024, servo reducing motor, 6025, door body closing cylinder, 6026, closing support, 6027, hinge shaft, 6028, 60arm, 6029, connecting rod, 6030, moving door outer side, 6031, closing block, 6032, pressing crank arm, 6033, crank arm, 6034, 6035, frame, sealing plate, 6046, frame, sealing plate, top, sealing plate, 6046, frame, sealing plate, top plate, sealing plate, and the like.

Detailed Description

The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.

An embodiment of a vacuum envelope moving seal door of the present utility model is shown in fig. 1 to 9, and includes a door frame 6002 for the entrance and exit of a ton bag provided on a vacuum packing chamber 6001 of an automatic packing machine, an outer frame 6003 fixedly provided at the periphery of the door frame 6002, a pair of moving doors 6004 provided in the outer frame 6003 for sealing the door frame 6002, a door body pulling moving mechanism 6005 provided on the outer frame 6003 for driving the pair of moving doors 600 to open and close, a pair of door body side pressing assemblies 6006 provided at left and right side portions of the outer frame 6003 for pressing and sealing butt door slits of the pair of moving doors 6004 when the moving doors 6004 are closed, a door body upper pressing assembly 6007 provided at an upper end portion of the outer frame 6003 for pressing and sealing the pair of moving doors 6004 against door frame 6002 end faces after the moving doors 6004 are closed, and a door body lower pressing assembly 7 provided at a lower end portion of the outer frame 6003 for pressing and sealing the door frame 6002 end faces after the moving doors 6004 are closed.

Preferably, the outer frame 6003 includes a pair of vertical connecting beams 6011 which are composed of an upper beam 6009, a lower beam 6010, and a pair of vertical connecting beams 6011 connected between both ends of the upper beam 6009 and the lower beam 6010; a pair of linear guide rails 6012 are fixed at the left and right sides of the lower end surface of the upper cross beam 6009, a door body hanging mechanism 6013 is correspondingly arranged between the pair of linear guide rails 6012 and the upper end surfaces of the pair of movable doors 6004, the door body hanging mechanism 6013 comprises a pair of movable sliding blocks 6014 arranged on the linear guide rails 6012, a hinged support mounting plate 6015 is connected between the pair of movable sliding blocks 6014, at least more than two upper hinged supports 6016 are arranged on the lower end surface of each hinged support mounting plate 6015, more than two lower hinged supports 6017 are correspondingly arranged on the upper end surface of each movable door 6004, a swinging block 6018 is correspondingly connected between the upper hinged support 6016 and the lower hinged support 6017, the upper part of the swinging block 6018 is in rotary connection with the upper hinged support 6016 through an upper hinged shaft 6019, and the lower part of the swinging block 6018 is in rotary connection with the lower hinged support 6017 through a lower hinged shaft 6020; wherein, the swinging plane formed by the swinging direction of the swinging block 6018 is perpendicular to the end face of the door frame 6002.

In this embodiment, a pair of channel steels 6021 are provided at left and right positions of the upper end face of the lower beam 6010 of the outer frame 6003, and the lower end portions of the door bodies of the pair of moving doors 6004 are provided in the pair of channel steels 6021 in a corresponding manner.

In this embodiment, the door traction moving mechanism 6005 includes a timing belt 6022 disposed above the outer frame 6003 and above the pair of moving doors 6004, and the hinge support mounting plate 6015 is provided with a timing belt connecting arm 6023 connected to the timing belt 6022; wherein a hinge mount plate 6015 for connecting one of the pair of moving doors 6004 is connected to one side belt of the timing belt 6022 by the timing belt connecting arm 6023, and a hinge mount plate 6015 for connecting the other of the pair of moving doors 6004 is connected to the other side belt of the timing belt 6022 by the timing belt connecting arm 6023, thereby effecting opening or closing of the pair of moving doors 6004; the one side belt body of the synchronous belt 6022 and the other side belt body of the synchronous belt 6022 are two side belt bodies with opposite moving directions when the synchronous belt 6022 works.

Preferably, the number of the timing belt connecting arms 6023 is one and they are disposed at both ends of the hinge support mounting plate 6015.

In this embodiment, a servo gear motor 6024 for driving the timing belt 6022 to move is provided on the outer frame 6003.

In this embodiment, the door lateral propping assembly 6006 includes a door body closing enclasping cylinder 6025 and enclasping support 6026 respectively fixed on a side frame 6046 of the vacuum packaging chamber 6001, an enclasping arm 6028 rotatably disposed on the enclasping support 6026 through a hinge 6027, and a connecting rod 6029 rotatably disposed on a front end of a piston rod of the door body closing enclasping cylinder 6025 through the hinge 6027, wherein the enclasping arm 6028 and the connecting rod 6029 are rotatably connected through the hinge 6027, and a enclasping block 6031 for propping and pressing an outer side 6030 of the moving door when the enclasping arm 6028 rotates is disposed on a front end of the enclasping arm 6028.

Wherein the clasping arm 6028 is retracted relative to the movable door 6004 in an initial state to prevent interference when the movable door 6004 is opened; after the movable door 6004 is closed (closed), the clasping arm 6028 clasps the outer side surface of the movable door 6004 by rotating about the hinge 6027 on the clasping support 6026, thereby realizing closed clamping of the movable door 6004.

Preferably, the clasping block 6031 is a polyurethane clasping block.

In this embodiment, the door upper pressing assembly 6007 includes a pressing crank arm 6032 connected to the swinging block 6018, a crank arm operation cylinder 6033 fixed to the upper cross beam 6009 for driving the pressing crank arm 6032 to rotate around the upper hinge shaft 6019 on the upper hinge seat 6016, and a pressing roller 6034 for pressing the cantilever end of the pressing crank arm 6032 is provided at the piston rod end of the crank arm operation cylinder 6033.

Preferably, the lower end surface of each hinge seat mounting plate 6015 is provided with three upper hinge seats 6016, and the pressing crank arm 6032 is provided on a swing block 6018 to which a middle one of the three upper hinge seats 6016 is connected.

In this embodiment, the door body downward pressing assembly 6008 includes a door body tensioning cylinder 6035 fixed on the lower beam 6010 and a bar-shaped pulling plate 6036 vertically connected to the front end of the piston rod of the door body tensioning cylinder 6035, a hook plate 6037 is vertically arranged at the front part of the bar-shaped pulling plate 6036, a neutral gear 6038 is arranged between a pair of channel steels 6021 on the lower beam 6010 of the outer frame 6003, the bar-shaped pulling plate 6036 is located between the neutral gears 6038 of the pair of channel steels 6021, and the hook plate 6037 is located outside the door body at the lower end of the movable door 6004.

Preferably, the number of the door body tightening cylinders 6035 provided for each of the moving doors 6004 is one pair.

In this embodiment, a door body closing seal structure 6039 is disposed on the side surfaces of the pair of moving doors 6004 that are closed together, the door body closing seal structure 6039 includes a caulking groove 6040 disposed on the closing side surface of one of the pair of moving doors 6004 in the up-down direction, a protruding rib 6041 disposed on the closing side surface of the other one of the pair of moving doors 6004 in the up-down direction, and a pair of strip-shaped rubber pads 6042 disposed between the closing side surfaces of the pair of moving doors 6004 in the up-down direction and disposed on both sides of the protruding rib 6041, and the protruding ribs 6041 of the pair of moving doors 6004 are embedded in the caulking groove 6040 when the pair of moving doors 6004 are closed together.

Preferably, a sealing strip 6043 is provided along the periphery of the movable door 6004, which is in contact with the door frame 6002 of the vacuum packaging chamber 6001.

In this embodiment, the door frame 6002 includes a rear door frame 6044 and a front door frame 6045 disposed on the vacuum packaging chamber 6001 in accordance with the conveying direction of the ton bag, and the rear door frame 6044 and the front door frame 6045 are respectively provided with the vacuum packaging bag moving seal door.

In this embodiment, the lower beam 6010 of the outer frame 6003 is connected to the bottom frame 6048 of the vacuum packaging chamber 6001; the upper beam 6009 of the outer frame 6003 is connected to the top frame 6047 of the vacuum packing chamber 6001.

The application method of the embodiment is as follows:

after the material loading of the ton bags placed on the turnover tray (the turnover tray is placed on the weighing and rechecking conveying workbench on the host machine) on the host machine of the automatic packaging machine is completed, the ton bags are pushed onto the transition roller conveying table at the rear door of the vacuum packaging chamber 6001 together with the turnover tray by the ton bag pushing device (tray pushing cylinder), at this time, the rear side moving sealing door of the vacuum packaging chamber 6001 is opened under the action of the door body traction moving mechanism 6005, the ton bags are further pushed onto the roller conveying frame in the vacuum packaging chamber 6001, then the rear side moving sealing door is closed, the vacuum packaging chamber 6001 is vacuumized, after the specified vacuum degree is reached, the automatic heat sealing bag operation of the ton bag opening is carried out by the heat sealing bag sealing device arranged in the vacuum packaging chamber 6001, after the heat sealing bag is completed, the front side moving sealing door is opened, and the ton bags are output from the front door of the vacuum packaging chamber 6001 by the pushing device.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (10)

1. The utility model provides a vacuum envelope removes sealing door, its characterized in that includes the door frame that is used for ton bag business turn over that sets up on automatic packaging machine's vacuum packaging room, fixes setting is in the peripheral outer frame of door frame, remove and set up in the outer frame be used for sealing the door frame a pair of movable door, set up on the outer frame be used for driving a pair of movable door open and the door body traction movement mechanism who closes, set up in the left and right sides position of outer frame be used for when the movable door closes a pair of movable door's butt joint door crack top tight sealed a pair of door body side direction roof pressure subassembly, set up in the upper end position of outer frame be used for after the movable door closes a pair of movable door compress tightly the door body on the door frame terminal surface and lean on the subassembly, set up in the lower extreme position of outer frame be used for after the movable door closes a pair of movable door compress tightly the door and seal the door body on the door frame terminal surface.

2. The vacuum envelope mobile seal door of claim 1, wherein the outer frame comprises an upper cross member, a lower cross member, and a pair of vertical connecting beams connected between both ends of the upper and lower cross members; a pair of linear guide rails are fixed at the left side and the right side of the lower end face of the upper cross beam, a door body hanging mechanism is correspondingly arranged between the pair of linear guide rails and the upper end faces of the pair of movable doors, the door body hanging mechanism comprises a pair of movable sliding blocks arranged on the linear guide rails, a hinged support mounting plate is connected between the pair of movable sliding blocks, at least more than two upper hinged supports are arranged on the lower end face of each hinged support mounting plate, more than two lower hinged supports are correspondingly arranged on the upper end face of each movable door, a swinging block is correspondingly connected between the upper hinged supports and the lower hinged supports, the upper parts of the swinging blocks are in rotary connection with the upper hinged supports through upper hinged shafts, and the lower parts of the swinging blocks are in rotary connection with the lower hinged supports through lower hinged shafts; and a swinging plane formed by the swinging direction of the swinging block is perpendicular to the end face of the door frame.

3. The movable sealing door for the vacuum envelope of claim 1, wherein a pair of channel steels are arranged at left and right positions of the upper end face of the lower cross beam of the outer frame, and the lower end parts of the door bodies of the pair of movable doors are correspondingly arranged in the pair of channel steels in a movable manner.

4. The vacuum envelope moving seal door as claimed in claim 2 wherein said door body pulling and moving mechanism comprises a timing belt disposed on an upper portion of said outer frame and above said pair of moving doors, said hinge mount plate being provided with a timing belt connecting arm connected to said timing belt; the hinged support mounting plate used for connecting one of the pair of movable doors is connected with one side belt body of the synchronous belt through the synchronous belt connecting arm, and the hinged support mounting plate used for connecting the other of the pair of movable doors is connected with the other side belt body of the synchronous belt through the synchronous belt connecting arm, so that the pair of movable doors can be opened or closed; the synchronous belt comprises a synchronous belt body, wherein one side belt body of the synchronous belt and the other side belt body of the synchronous belt are two side belt bodies with opposite moving directions when the synchronous belt works.

5. The movable sealing door for the vacuum envelope of claim 2, wherein the door body lateral pressing assembly comprises a door body closing enclasping cylinder and an enclasping support fixed on a side frame of the vacuum envelope chamber respectively, an enclasping arm arranged on the enclasping support through a hinge shaft in a rotating manner, and a connecting rod arranged at the front end of a piston rod of the door body closing enclasping cylinder through the hinge shaft in a rotating manner, the enclasping arm is in rotating connection with the connecting rod through the hinge shaft, and an enclasping block for pressing the outer side surface of the movable door when the enclasping arm rotates is arranged at the front end of the enclasping arm.

6. The movable sealing door of the vacuum envelope of claim 2, wherein the upper pressing assembly of the door body comprises a pressing crank arm connected to the swinging block and a crank arm operation cylinder fixed on the upper cross beam and used for driving the pressing crank arm to rotate around an upper hinge shaft on the upper hinge seat, and a pressing roller used for pressing the cantilever end of the pressing crank arm is arranged at the end part of a piston rod of the crank arm operation cylinder.

7. The vacuum envelope moving seal door as claimed in claim 2 wherein said door body hold-down assembly comprises a door body take-up cylinder fixed to said lower beam and a strip-shaped pull plate vertically connected to the front end of the piston rod of said door body take-up cylinder, a hook plate being provided in the front of said strip-shaped pull plate in a standing manner, a neutral gear being provided between a pair of channel steel on said outer frame lower beam, said strip-shaped pull plate being located between said neutral gear of said pair of channel steel, said hook plate being located outside the door body at the lower end of the moving door.

8. The movable sealing door for vacuum envelope according to claim 1, wherein a door body closing sealing structure is provided at the side of the pair of movable doors which are closed to each other, the door body closing sealing structure comprising a caulking groove provided at the closing side of one of the pair of movable doors in the up-down direction, a bead provided at the closing side of the other of the pair of movable doors in the up-down direction, a pair of strip-shaped rubber pads provided between the closing sides of the pair of movable doors in the up-down direction and disposed at both sides of the bead, the bead of the pair of movable doors being inserted into the caulking groove when the pair of movable doors are closed.

9. A vacuum envelope moving seal door as claimed in claim 1 wherein an edge seal is provided on said moving door along the periphery thereof on the side thereof which contacts the vacuum envelope door frame.

10. The movable sealing door for vacuum envelope as claimed in claim 1, wherein the door frame comprises a rear door frame and a front door frame which are arranged on the vacuum envelope chamber according to the conveying direction of the ton bag, and the movable sealing door for vacuum envelope is respectively arranged on the rear door frame and the front door frame.