CN216186338U - Automatic bag sealing device for vacuumizing - Google Patents

Abstract

The utility model discloses an automatic bag sealing device by vacuum pumping, which comprises a bag closing mechanism for closing a bag opening in the vertical direction, a vacuum pumping mechanism for vacuumizing the inside of a packaging bag and a sealing mechanism for fixing and thermally sealing the bag opening, wherein the sealing mechanism comprises an upper cross beam and a lower cross beam, the upper cross beam and the lower cross beam are respectively arranged in a lifting manner along the vertical direction, an upper pressing piece and an upper hot pressing piece are arranged at the bottom of the upper cross beam, a lower pressing piece and a lower hot pressing piece are correspondingly arranged at the top of the lower cross beam, the bottom surface of the upper pressing piece is lower than the bottom surface of the upper hot pressing piece, the top surface of the lower pressing piece is higher than the top surface of the lower hot pressing piece, and the upper pressing piece and the lower pressing piece can be elastically deformed in the vertical direction. The automatic bag sealing device for vacuumizing can realize full automation, and has the advantages of compact structure, small occupied space, simple packaging process and high production efficiency.

Description

Automatic bag sealing device for vacuumizing

Technical Field

The utility model relates to an automatic bag sealing device for vacuumizing.

Background

Vacuum packaging is a common packaging method and is applied in many industries, and generally needs to be completed by a vacuum packaging device, but in the prior art, the vacuum packaging device still has many problems. On one hand, the existing vacuum packaging device needs to manufacture a vacuum environment outside the packaging bag, so that the vacuum packaging process is complex and the efficiency is low; on the other hand, the conventional vacuum packaging device has low integration level of each functional module, the whole device is bulky in structure and large in occupied space; moreover, the existing vacuum packaging device has low automation degree, and partial procedures still need to be completed by manual assistance, such as opening of packaging bags, filling of materials and the like.

Disclosure of Invention

The utility model aims to provide a novel vacuumizing automatic bag sealing device to solve one or more problems in the prior art.

In order to achieve the purpose, the utility model adopts the technical scheme that:

an automatic bag sealing device for vacuumizing is provided, wherein a packaging bag is provided with an upper bag body positioned above and a lower bag body positioned below, the front side edge of the upper bag body is relatively separated from the front side edge of the lower bag body to form a bag opening which is open forwards, the automatic bag sealing device comprises a bag closing mechanism for closing the bag opening in the vertical direction, a vacuumizing mechanism for vacuumizing the interior of the packaging bag and a sealing mechanism for fixing and thermally sealing the bag opening, the sealing mechanism comprises an upper cross beam and a lower cross beam, the upper cross beam and the lower cross beam are respectively arranged in a lifting way along the vertical direction, an upper pressing piece and an upper hot pressing piece are arranged at the bottom of the upper cross beam, a lower pressing piece and a lower hot pressing piece are correspondingly arranged at the top of the lower cross beam, the bottom surface of the upper pressing piece is lower than the bottom surface of the upper hot pressing piece, and the top surface of the lower pressing piece is higher than the top surface of the lower hot pressing piece, the upper pressing piece and the lower pressing piece can be elastically deformed in the vertical direction, and the vacuumizing mechanism is arranged in a height-adjustable mode in the vertical direction.

Preferably, the upper pressing piece is located behind the upper hot pressing piece, and the lower pressing piece is located behind the lower hot pressing piece.

Preferably, the vacuum pumping mechanism at least has a hollow vacuum pumping pipe, a negative pressure adsorption port is arranged at the rear part of the vacuum pumping pipe, the vacuum pumping pipe extends in the front-back direction and can be arranged in a relative motion manner in the front-back direction, and when the vacuum pumping pipe is inserted into the packaging bag, the negative pressure adsorption port is positioned behind the upper pressing piece and the lower pressing piece.

Furthermore, the vacuumizing tube is provided with a vacuum action rod which is positioned at the rear part and can extend backwards into the packaging bag, the vacuum action rod is in a flat rod shape, and the negative pressure adsorption port is formed in the vacuum action rod.

Further, the vacuum action rod is provided with a hollow rod cavity, the negative pressure adsorption port is an opening which is arranged at the rear end part of the vacuum action rod and is opened towards the rear, and the opening is communicated with the hollow rod cavity.

Preferably, the evacuation tube has a first working position and a second working position, and when in the first working position, the evacuation tube is at least partially located behind the upper compressing member; when in the second working position, the evacuation tube is entirely located in front of the upper heat pressing member.

Further, close a bag mechanism and locate two sets of bag subassemblies that close of the left and right sides including the branch, every group close the bag subassembly and all including can follow the vertical seat that left and right directions removed, can follow the fore-and-aft direction and locate with moving the vertical seat is last and be flaky depression bar, and is two sets of the depression bar stretches into in the sack and keep away from the in-process of motion each other, the sack is by opening state to the conversion of closed state.

Further, every group close the bag subassembly still including being used for the centre gripping on the wrapping bag left/right side portion, the clamping jaw sets up on the seat and rather than the homonymy the depression bar moves along the left and right directions in step.

Furthermore, the compression bars can be arranged on the vertical seats in a lifting manner along the vertical direction, and the two groups of compression bars are positioned between the two groups of vertical seats in the left-right direction.

Further, the wrapping bag is put and is established on the packing station of workstation, and the front portion suspension of wrapping bag is in the place ahead of workstation, just go up the pressfitting spare, go up hot pressing piece, press the piece down, hot pressing piece all is located down along the front and back direction the place ahead of workstation.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages: according to the automatic bag sealing device with the vacuumizing function, the bag closing mechanism, the vacuumizing mechanism and the sealing mechanism are integrated, so that the full automation can be realized, the structure is compact, and the occupied space is small; go up the pressfitting piece and press the piece to mutually support down and can prevent that outside air from getting into the wrapping bag, go up the fixed heat-seal of sack can be realized to mutually supporting of hot pressing piece and hot pressing piece down, need not to make vacuum environment, production efficiency is higher.

Drawings

FIG. 1 is a schematic perspective view of an automatic bag sealing device according to the present invention;

FIG. 2 is a schematic perspective view of the automatic bag sealer with vacuum in FIG. 1 at another viewing angle;

FIG. 3 is a schematic view of a part of the structure of the automatic bag sealing device;

FIG. 4 is a perspective view of the automatic bag sealer of FIG. 3 from another perspective;

FIG. 5 is a schematic perspective view of a bag closing mechanism of the vacuum-pumping automatic bag sealing device of the present invention, wherein the clamping jaws are in a closed state;

FIG. 6 is a schematic perspective view of the bag closing mechanism of FIG. 5 from another perspective, wherein the jaws are in an open position;

FIG. 7 is a schematic perspective view of a vacuum-pumping mechanism in the vacuum-pumping automatic bag-sealing device according to the present invention;

FIG. 8 is a schematic perspective view of a sealing mechanism and a bag opening mechanism in the vacuum-pumping automatic bag sealing device of the present invention;

FIG. 9 is a schematic perspective view of the sealing mechanism and the bag opening mechanism shown in FIG. 8 from another viewing angle;

FIG. 10 is an enlarged view of a portion of FIG. 9 at A;

wherein:

100. packaging bags; 200. packaging the product in a bag;

1. a bag closing mechanism; 11. a bag closing assembly; 111. a vertical seat; 112. a pressure lever; 113. a clamping jaw;

2. a vacuum pumping mechanism; 21. vacuumizing a tube; 211. a negative pressure adsorption port; 212. a vacuum action rod;

3. a sealing mechanism; 31. an upper cross beam; 311. an upper pressing part; 312. an upper hot-pressing part; 32. a lower cross beam; 321. pressing the combined piece; 322. a lower hot-pressing part; 33. a first driving member; 34. a second driving member;

4. a bag opening mechanism; 41. an upper support bag assembly; 411. an upper clamping member; 412. a cross bar is arranged on the upper part; 413. a third driving member; 42. a lower bag supporting component; 421. a lower clamping member; 422. a cross bar is arranged at the lower part; 423. a fourth drive; 4a, a first cylinder; 4b, a fixing piece; 4c, a second cylinder; 4d, a clamping piece;

5. a packaging bag feeding mechanism; 51. a feeding table; 52. a feeding frame; 521. an upper adsorption member; 53. a first rail bracket; 54. a second rail bracket; 55. a third rail bracket;

6. a work table;

7. a bag opening mechanism; 71. a downdraft accessory;

8. a bagging mechanism; 81. a material conveying seat;

9. a transport mechanism; 91. and (4) a conveyor belt.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.

Referring to the drawings, an automatic bag sealing device with vacuum pumping is shown in the figures, wherein a packaging bag 100 has an upper bag body (not shown) at the upper part and a lower bag body (not shown) at the lower part, the front side edge part of the upper bag body is opposite to the front side edge part of the lower bag body and forms a bag opening which is opened forwards, the automatic bag sealing device comprises a bag sealing mechanism 1 for sealing the bag opening in the up-and-down direction, a vacuum pumping mechanism 2 for pumping vacuum in the packaging bag 100, and a sealing mechanism 3 for fixing and heat-sealing the bag opening, the sealing mechanism 3 comprises an upper beam 31 and a lower beam 32, the upper beam 31 and the lower beam 32 are respectively arranged in a lifting way along the vertical direction, the bottom of the upper beam 31 is provided with an upper press-fitting piece 311 and an upper heat-pressing piece 312, the top of the lower beam 32 is correspondingly provided with a lower press-fitting piece 321 and a lower heat-pressing piece 322, the bottom of the upper press-fitting 311 is lower than the bottom of the upper heat-pressing piece 312, the top surface of the lower pressing part 321 is higher than the top surface of the lower thermal pressing part 322, both the upper pressing part 311 and the lower pressing part 321 can be elastically deformed in the vertical direction, and the vacuum pumping mechanism 2 is height-adjustably arranged in the vertical direction. Thus, when the upper beam 31 and the lower beam 32 approach each other, the upper pressing piece 311 and the lower pressing piece 321 are pressed against each other to generate elastic deformation, and at this time, the upper pressing piece 311 and the lower pressing piece 321 can seal the opening of the packaging bag 100, so as to avoid air leakage during subsequent vacuum pumping; continuing to bring the upper and lower cross members 31, 32 closer together, the upper and lower heat press members 312, 322 are now able to heat seal the mouth of the package 100 while the upper and lower heat press members 312, 322 are in contact with each other.

Specifically, referring to fig. 3 and 8, the upper press-fitting part 311 is located behind the upper press-fitting part 312, and the lower press-fitting part 321 is located behind the lower press-fitting part 322. In this manner, when the vacuum automatic sealing apparatus of the present embodiment performs the heat sealing operation, the external air can be prevented from entering the packing bag 100.

Referring to fig. 1 to 4, the sealing mechanism 3 further includes a first driving member 33 for driving the upper beam 31 to move in the vertical direction, and a second driving member 34 for driving the lower beam 32 to move in the vertical direction, in this embodiment, the first driving member 33 and the second driving member 34 are both air cylinders, and the telescopic rod of the first driving member 33 and the telescopic rod of the second driving member 34 can both move in a telescopic manner in the vertical direction.

Referring to fig. 7, the vacuum mechanism 2 at least has a hollow vacuum tube 21, the vacuum tube 21 is provided with a negative pressure suction port 211 at the rear portion, the vacuum tube 21 extends in the front-rear direction and is disposed to be capable of moving relatively in the front-rear direction, and when the vacuum tube 21 is inserted into the packaging bag 100, the negative pressure suction port 211 is located behind the upper pressing member 311 and the lower pressing member 321.

Specifically, the evacuation tube 21 has a vacuum action rod 212 located at the rear and capable of extending backward into the packaging bag 100, the vacuum action rod 212 is in a flat rod shape, and the negative pressure suction port 211 is provided on the vacuum action rod 212. The vacuum operation rod 212 has a hollow rod cavity, and the negative pressure suction port 211 is an opening provided at the rear end portion of the vacuum operation rod 212 and opened rearward, and the opening communicates with the hollow rod cavity.

The evacuation tube 21 has a first working position and a second working position, and when the evacuation tube 21 is located at the first working position, the evacuation tube 21 is at least partially located behind the upper pressing member 311; when in the second working position, evacuation tube 21 is entirely in front of upper autoclave 312. When the vacuum tube 21 is used for evacuating the packaging bag 100, the upper pressing piece 311 and the lower pressing piece 321 are respectively pressed on the vacuum action rod 212, the vacuum action rod 212 is flat, and meanwhile, the upper pressing piece 311 and the lower pressing piece 321 can elastically deform in the vertical direction, so that when the vacuum tube 21 evacuates the packaging bag 100, external air can be prevented from entering the packaging bag 100.

Referring to fig. 5 and 6, the bag closing mechanism 1 includes two groups of bag closing assemblies 11 respectively disposed on the left and right sides, each group of bag closing assemblies 11 includes a vertical seat 111 capable of moving in the left-right direction, and a pressing rod 112 disposed on the vertical seat 111 and in the form of a sheet and capable of moving in the front-back direction, and the two groups of pressing rods 112 extend into the bag opening and move away from each other, so that the bag opening is switched from an open state to a closed state. In this embodiment, the pressing rod 112 can also slide relative to the vertical base 111 along the front-back direction, i.e. the user can adjust the length of the pressing rod 112 extending into the packaging bag 100 according to the size or sealing requirement of the packaging bag 100.

Each group of bag closing assemblies 11 further comprises a clamping jaw 113 used for clamping the left/right side portions of the packaging bag 100, the clamping jaw 113 is arranged on the vertical base 111 and moves in the left-right direction synchronously with the pressure lever 112 on the same side of the vertical base, and the clamping jaw 113 and the pressure lever 112 are located at the same height, so that the clamping jaw 113 and the pressure lever 112 can simultaneously act on the packaging bag 100, the bag mouth of the packaging bag 100 can be closed neatly, and the subsequent sealing operation is facilitated. In this embodiment, the clamping jaw 113 is slidably disposed on the vertical base 111 along the left-right direction, that is, the user can adjust the distance between the clamping jaw 113 and the pressing rod 112 along the left-right direction as required to adapt to the packaging bags 100 with different sizes.

The pressing rod 112 and the clamping jaw 113 can be vertically arranged on the vertical base 111, and the two groups of pressing rods 112 are positioned between the two groups of vertical bases 111 in the left-right direction, so that a user can adjust the heights of the pressing rods 122 and the clamping jaw 113 relative to the vertical bases 111 as required. When bag closure assembly 11 closes the mouth of bag 100, plunger 112 is partially/entirely located inside bag 100 while jaws 113 are located outside bag 100.

Referring to fig. 8 to 10, the automatic vacuum-pumping bag sealing device further includes a bag opening mechanism 4 for further opening the bag opening in the up-down direction, so that the product 200 to be packaged enters the packaging bag 100, and the bag opening mechanism 4 includes an upper bag opening assembly 41 and a lower bag opening assembly 42 which can be lifted and lowered in the vertical direction, respectively. Specifically, the upper bag opening assembly 41 includes two sets of upper clamping members 411 which are arranged at intervals in the left-right direction and can be clamped at the front edge of the upper bag body, the two sets of upper clamping members 411 can be arranged relatively far away or relatively close to each other, the upper bag opening assembly 41 further includes an upper mounting cross bar 412 for mounting the two sets of upper clamping members 411, and a third driving member 413 for driving the upper mounting cross bar 412 to move in the vertical direction, in this embodiment, the vacuum pumping mechanism 2 is arranged on the upper mounting cross bar 412; the lower bag supporting assembly 42 comprises two groups of lower clamping pieces 421 which are arranged at intervals along the left-right direction and can be clamped at the front edge of the lower bag body, the two groups of lower clamping pieces 421 can be arranged relatively far away or relatively close to each other, the lower bag supporting assembly 42 further comprises a lower mounting cross rod 422 used for mounting the two groups of lower clamping pieces 421, and a fourth driving piece 423 used for driving the lower mounting cross rod 422 to move along the vertical direction. In this embodiment, the third driving member 413 and the fourth driving member 423 are both air cylinders, and the telescopic rods of the third driving member 413 and the fourth driving member 423 are both capable of telescopic movement along the vertical direction.

The upper clamping piece 411 and the lower clamping piece 421 both include a first cylinder 4a, a fixing piece 4b driven by the first cylinder 4a and moving in the front-back direction, and a second cylinder 4c fixed on the fixing piece 4b, wherein the first cylinder 4a is adjustably arranged on the upper mounting cross bar 412/the lower mounting cross bar 422 in the left-right direction, the telescopic direction of the telescopic rod of the first cylinder 4a extends in the front-back direction, the extending end of the telescopic rod of the fixing piece 4b and the first cylinder 4a is fixedly connected, the telescopic direction of the telescopic rod of the second cylinder 4c extends in the vertical direction, a clamping piece 4d is fixed on the extending end of the second cylinder 4c, and when the telescopic rod of the second cylinder 4c extends, the clamping piece 4d is close to the fixing piece 4b and clamps the front edge of the upper bag body/the lower bag body.

Referring to fig. 1 and 2, the vacuum automatic sealing apparatus further includes a bag feeding mechanism 5 for transferring the empty bags 100 one by one to a table 6, a bag opening mechanism 7 for opening the mouths of the bags 100 in the up-down direction, and a bag filling mechanism 8 for delivering the products 200 to be packaged from the mouths back into the bags 100.

In this embodiment, the length direction of the packaging bag 100 is set along the front-back direction, the bag opening of the packaging bag 100 faces the front, the bag opening has an open state and a closed state, and when the bag opening is in the open state, the front side edge of the upper bag body and the front side edge of the lower bag body are away from each other along the up-down direction; when the bag mouth is in a closed state, the front side edge part of the upper bag body and the front side edge part of the lower bag body are closed up along the vertical direction.

The packaging bag feeding mechanism 5 includes a feeding table 51 for supplying the empty packaging bag 100, and a feeding frame 52 capable of moving in the left-right direction and the up-down direction, the feeding table 51 is disposed on one side or both sides of the left-right direction of the worktable 6, and the feeding frame 52 is provided with a plurality of upper adsorbing members 521 with downward adsorbing openings. In this embodiment, the feeding frame 52 is provided with a plurality of rows of upper absorbing members 521 arranged at intervals along the front-rear direction, so as to ensure that the upper absorbing members 521 on the feeding frame 52 can uniformly absorb the packaging bags 100. The packaging bag feeding mechanism 5 further includes a first rail frame 53 extending in the left-right direction, a second rail frame 54 provided on the first rail frame 53 so as to be relatively slidable in the left-right direction, and a third rail frame 55 provided on the second rail frame 54 so as to be slidable in the front-rear direction. The second rail frame 54 extends in the front-rear direction, the third rail frame 55 extends in the vertical direction, and the supply frame 52 is provided on the third rail frame 55 so as to slide in the vertical direction. In this way, the supply rack 52 can place the packaging bag 100 on the supply table 51 at the packaging station of the table 6, suspend the front portion of the packaging bag 100 in front of the table 6, and position the upper press-fitting piece 311, the upper heat-pressing piece 312, the lower press-fitting piece 321, and the lower heat-pressing piece 322 in front of the table 6 in the front-rear direction.

Referring to fig. 3, the bag opening mechanism 7 includes a lower suction member 71 disposed below the table 6 and having an upward suction opening, the table 6 has a packaging station for packaging operation, the lower suction member 71 is located in front of the packaging station, when the packaging bag 100 is located at the packaging station, the lower suction member 71 is located below the front portion of the packaging bag 100, a portion of the upper suction member 521 is located above the front portion of the packaging bag 100, and when the lower suction member 71 moves away from the upper suction member 521, the initial opening of the bag opening of the packaging bag 100 can be achieved.

Referring to fig. 1 and 2, the bag sealing device further includes a conveying mechanism 9 for conveying the product 200 to be packaged, and a limiting mechanism (not shown) for limiting the backward conveying position of the product 200 to be packaged, and the conveying mechanism 9 includes two sets of conveyor belts 91 arranged at intervals in the left-right direction. Bagging-off mechanism 8 is including passing material seat 81, passes material seat 81 and can follow fore-and-aft direction translation motion and can set up along vertical direction elevating movement ground, passes material seat 81 and lies in between two sets of conveyer belts 91 along left right direction, and passes material seat 81, stop gear and transmission device 9 and all lie in the place ahead of workstation 6.

The operation method of the automatic bag sealing device by vacuum pumping of the embodiment is specifically described as follows:

the supply frame 52 moves to the upper side of the supply table 51, the supply frame 52 moves downward, the upper suction member 521 sucks the upper bag body of the packaging bag 100, and the supply frame 52 conveys the packaging bag 100 to the work table 6.

The lower suction attachment 71 of the bag opening mechanism 7 is attached to the lower bag body of the packaging bag 100, the upper suction attachment 521 and the lower suction attachment 71 are relatively far away, and the mouth of the packaging bag 100 is opened.

The upper clamping piece 411 of the upper bag opening component 41 clamps the front edge of the upper bag body of the packaging bag 100, the lower clamping piece 421 of the lower bag opening component 42 clamps the front edge of the lower bag body, and the upper bag opening component 41 and the lower bag opening component 42 move away from each other, so that the bag opening of the packaging bag 100 is further opened.

The material conveying seat 81 moves upwards to separate the product to be packaged 200 from the transmission mechanism 9, the material conveying seat 81 moves backwards until the product to be packaged is conveyed into the packaging bag 100, and the material conveying seat 81 returns to the initial position to wait for the next bagging.

The evacuation tube 21 is moved backward until the vacuum action rod 212 is inserted into the mouth of the packaging bag 100, the two sets of pressure rods 112 of the bag closing mechanism 1 are inserted into the mouth of the packaging bag 100, the two sets of clamping jaws 113 respectively clamp the left and right side edges of the packaging bag 100, and the two sets of bag closing assemblies 11 respectively move to the left and right sides, so that the front edge of the upper bag body of the packaging bag 100 and the front edge of the lower bag body are close to each other.

The upper beam 31 and the lower beam 32 of the sealing mechanism 3 move close to each other until the upper pressing piece 311 and the lower pressing piece 321 contact each other, at this time, the vacuum action rod 212 is located between the upper pressing piece 311 and the lower pressing piece 321, the vacuum tube 21 evacuates air in the packaging bag 100, the vacuum tube 21 moves forward until the vacuum action rod 212 is evacuated from the mouth of the packaging bag 100, and the upper beam 31 and the lower beam 32 continue to move close to each other until the upper hot pressing piece 312 and the lower hot pressing piece 322 contact each other, thereby realizing fixed heat sealing of the mouth of the packaging bag 100.

In summary, the bag closing mechanism 1, the vacuum pumping mechanism 2 and the sealing mechanism 3 of the automatic bag sealing device for vacuum pumping of the embodiment are integrated into a whole, so that full automation can be realized, the structure is compact, and the occupied space is small; go up pressfitting piece 311 and press down the piece 321 and mutually support and can prevent that outside air from getting into wrapping bag 100, go up the fixed heat-seal of sack can be realized to mutually supporting of hot pressing piece 312 and lower hot pressing piece 322, need not to make vacuum environment, and production efficiency is higher.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. The utility model provides an automatic sack sealing device of evacuation, wherein, the wrapping bag has the upper bag body that is located the top and the lower bag body that is located the below, the front side edge portion of the upper bag body with the front side edge portion phase separation of the lower bag body forms the sack that opens forward, its characterized in that: the automatic bag sealing device comprises a bag opening closing mechanism, a vacuumizing mechanism and a sealing mechanism, wherein the bag opening closing mechanism is closed in the vertical direction, the vacuumizing mechanism is used for vacuumizing the interior of the packaging bag, the sealing mechanism is used for fixing and heat-sealing the bag opening and comprises an upper cross beam and a lower cross beam, the upper cross beam and the lower cross beam are arranged in a lifting mode in the vertical direction respectively, an upper pressing piece and an upper hot pressing piece are arranged at the bottom of the upper cross beam, a lower pressing piece and a lower hot pressing piece are correspondingly arranged at the top of the lower cross beam, the bottom surface of the upper pressing piece is lower than the bottom surface of the upper hot pressing piece, the top surface of the lower pressing piece is higher than the top surface of the lower hot pressing piece, the upper pressing piece and the lower pressing piece can be arranged in an elastic deformation mode in the vertical direction, and the vacuumizing mechanism can be arranged in a height-adjustable mode in the vertical direction.

2. The evacuated automatic bag sealer according to claim 1, wherein: the upper pressing piece is positioned behind the upper hot pressing piece, and the lower pressing piece is positioned behind the lower hot pressing piece.

3. The automatic bag sealing device by vacuum pumping according to claim 2, characterized in that: the vacuum pumping mechanism is at least provided with a hollow vacuum pumping pipe, the rear part of the vacuum pumping pipe is provided with a negative pressure adsorption port, the vacuum pumping pipe extends along the front-back direction and can be arranged along the front-back direction in a relative motion mode, and when the vacuum pumping pipe is inserted in the packaging bag, the negative pressure adsorption port is located behind the upper pressing piece and the lower pressing piece.

4. The evacuated automatic bag sealer according to claim 3, wherein: the vacuum-pumping pipe is provided with a vacuum action rod which is positioned at the rear part and can extend backwards into the packaging bag, the vacuum action rod is in a flat rod shape, and the negative pressure adsorption port is arranged on the vacuum action rod.

5. The evacuated automatic bag sealer according to claim 4, wherein: the vacuum action rod is provided with a hollow rod cavity, the negative pressure adsorption port is an opening which is arranged at the rear end part of the vacuum action rod and is open towards the rear, and the opening is communicated with the hollow rod cavity.

6. The evacuated automatic bag sealer according to claim 3, wherein: the vacuum tube is provided with a first working position and a second working position, and when the vacuum tube is positioned at the first working position, the vacuum tube is at least partially positioned behind the upper pressing part; when in the second working position, the evacuation tube is entirely located in front of the upper heat pressing member.

7. The evacuated automatic bag sealer according to claim 6, wherein: close a bag mechanism and locate two sets of bag subassemblies that close of the left and right sides including the branch, every group close the bag subassembly and all including can follow the vertical seat that left right direction removed, can locate along the fore-and-aft direction motion on the vertical seat and be flaky depression bar, two sets of the depression bar stretches into in the sack and the in-process of keeping away from the motion each other, the sack is by the open mode to the closed state conversion.

8. The evacuated automatic bag sealer according to claim 7, wherein: every group close the bagging assembly and still include and be used for the centre gripping to be in the clamping jaw on the wrapping bag left/right side limit portion, the clamping jaw sets up on the vertical seat and with rather than the homonymy the depression bar moves along the left and right directions in step.

9. The evacuated automatic bag sealer according to claim 7, wherein: the compression bars can be arranged on the vertical seats in a lifting manner along the vertical direction, and the left and right directions of the two sets of compression bars are positioned between the two sets of vertical seats.

10. The evacuated automatic bag sealer according to claim 1, wherein: the wrapping bag is put and is established on the packing station of workstation, and the front portion suspension of wrapping bag in the place ahead of workstation, just go up the pressfitting piece go up hot casting die down the pressfitting piece all is located along the front and back side down the place ahead of workstation.

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