Clamping type automatic vacuum packaging machine

Abstract

The invention provides a clamping type automatic vacuum packaging machine, and relates to the technical field of packaging machines, the clamping type automatic vacuum packaging machine comprises a sealing sleeve mounted on a lower sealing shell, a plurality of air suction pipes are mounted on the sealing sleeve at equal intervals, limiting sleeves are mounted in the air suction pipes, and tension springs are mounted between the limiting sleeves and the upper ends of the air suction pipes; a plurality of fixing rings are installed on the tension spring at equal intervals, studs are installed on the fixing rings in a threaded mode, screws are coaxially installed at the lower ends of the studs, a one-way disc is installed on the limiting sleeve in an attached mode, and the screws are connected into the one-way disc in a threaded mode. Feeding, sealing, cutting and discharging operations are synchronously completed in the same cycle period, a clamper moves away a sealed finished product while placing a new packaging box, the process interval time is greatly shortened, conveying rollers on the two sides automatically pull a sealing film, manual intervention of film replacement is not needed, and it is ensured that a production line runs continuously.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging machines, and more specifically, it relates to a clamping type automatic vacuum packaging machine. Background Art

[0002] In the current packaging industry, as an important terminal packaging device, the performance and efficiency of the clamping type automatic vacuum packaging machine directly affect the freshness, shelf life and market competitiveness of products. However, there are significant technical bottlenecks in the existing clamping type automatic vacuum packaging machines. The traditional vacuum packaging process usually adopts the method of slow air extraction, that is, after the sealing chamber is formed, the air extraction system gradually reduces the pressure in the sealed cavity at a relatively gentle rate. This slow process of forming negative pressure increases the risk of air leakage during the packaging process. During the slow air extraction process, the tiny gaps between the packaging material and the product box are likely to form air flow channels, and external air will continuously penetrate into the sealed cavity along these channels, resulting in the inability to achieve the desired vacuum degree. In addition, the long-term slow air extraction will cause the sealing material to have tiny deformations and displacements, further increasing the possibility of air leakage, making it impossible for the packaging system to establish a stable and effective vacuum environment.

[0003] More critically, the poor vacuum adsorption effect caused by this slow air extraction has a series of chain reactions on the entire packaging process. Vacuum adsorption is a key step to ensure the tight fit between the packaging material and the product box. When the adsorption effect is not ideal, the packaging material cannot fully fit the product surface, and quality defects such as wrinkles, bubbles or poor sealing will be formed during the subsequent heat sealing and forming processes. These defects not only affect the appearance beauty of the product and reduce the market competitiveness, but more seriously, they will cause the airtight performance of the packaging to decline, allowing external oxygen, moisture and microorganisms to have the opportunity to invade the inside of the packaging, accelerating the oxidation, deterioration and spoilage processes of the product. For products with extremely high requirements for the packaging environment such as food, medicine and precision electronic components, such packaging defects may directly lead to product scrapping or safety hazards. In addition, the poor vacuum adsorption effect will also increase the defective rate of the production line and material waste, extend the production cycle, increase energy consumption and labor costs, and affect the production efficiency and economic benefits of the enterprise. Summary of the Invention

[0004] (I) Technical Problems to be Solved Aiming at the problems existing in the prior art, the present invention provides a clamping type automatic vacuum packaging machine to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solutions To achieve the above object, the present invention provides the following technical solution: A clamping type automatic vacuum packaging machine, including a lower sealing shell; further including a negative pressure mechanism, the negative pressure mechanism includes a sealing sleeve installed on the lower sealing shell, a plurality of suction pipes are equidistantly installed on the sealing sleeve, a limiting sleeve is installed in the suction pipe, a tension spring is installed between the limiting sleeve and the upper end of the suction pipe, a plurality of fixing rings are equidistantly installed on the tension spring, a stud is threadedly installed on the fixing ring, a screw rod is coaxially installed at the lower end of the stud, a one-way disc is fitted and installed on the limiting sleeve, the screw rod is threadedly connected in the one-way disc, the pitch of the stud and the one-way disc is the same, an intermediate rod is coaxially installed on the one-way disc, a plurality of magnetic heads are installed on the side wall of the intermediate rod, a magnetic ring is installed on the inner wall of the suction pipe, a through groove is provided on the magnetic ring, and the magnetic ring and the magnetic heads are of the same pole setting; further including a self-suction mechanism, the self-suction mechanism includes a self-suction pipe and a suction cup installed on the self-suction pipe.

[0006] Preferably, the negative pressure mechanism includes a positioning rod and a fixing frame installed in the suction pipe, a positioning groove is provided in the intermediate rod, and the positioning rod is slidably connected in the positioning groove.

[0007] Preferably, a gripper is installed on the fixing frame, two clamping plates are installed at both ends of the gripper, conveying rollers are respectively installed at both ends of the fixing frame, sealing films are respectively wound and connected on the two conveying rollers, and a plurality of conveyors are installed on the fixing frame.

[0008] Preferably, a plurality of top rods are installed on the fixing frame, an upper sealing shell is slidably installed on the plurality of top rods, a top spring is sleeved on the top rod and abuts inside the upper sealing shell, and a pressing plate is installed at the lower end of the top rod.

[0009] Preferably, a plurality of groups of springs are installed at the lower end of the pressing plate, a plurality of heating blocks are installed on the plurality of groups of springs, and a plurality of cutting blades sleeved on the heating blocks are installed on the pressing plate.

[0010] Preferably, a speed reducer is installed on the fixing frame, a motor is installed on the speed reducer, a swing plate is installed at the extending end of the speed reducer, the other end of the swing plate is rotatably connected to a follower plate, the follower plate is rotatably connected to a synchronous block, and two reciprocating rods are installed on the synchronous block and are connected to the lower sealing shell.

[0011] Preferably, a plurality of piston rods are hermetically and slidably connected to the lower sealing shell, and the lower ends of the plurality of piston rods are fixedly connected to the fixing frame. A plurality of boxes are installed in the sealing sleeve, and the sealing film is attached to the lower sealing shell.

[0012] Preferably, a bottom plate is fixedly mounted on the piston rod, and the self-priming pipe is mounted on the bottom plate.

[0013] Preferably, a suction disc is slidably installed in the self-suction pipe, the suction disc is sealingly slidably connected in the self-suction pipe, a pressure rod is installed at the upper end of the suction disc, a return spring is installed at the lower end of the suction disc, and the return spring is connected to the self-suction pipe.

[0014] Preferably, a communicating hole is provided at the lower end of the self-suction pipe.

[0015] (3) Beneficial effects Compared with the prior art, the present invention provides a clamping type automatic vacuum packaging machine with the following beneficial effects: The equipment uses an integrated clamping mechanism to achieve simultaneous completion of loading, sealing, cutting and unloading operations within the same cycle. The clamper removes the sealed finished product while placing the new packaging box, significantly shortening the interval between processes. The conveyor rollers on both sides automatically pull the sealing film, eliminating the need for manual intervention to change the film and ensuring uninterrupted operation of the production line.

[0016] It adopts a magnetic-spring double sealing valve: in the initial stage, the magnetic repulsion and spring tension work together to seal, ensuring that the external air pressure is isolated before the sealing chamber is completely closed; when the negative pressure in the cavity reaches the preset threshold (exceeding the sum of the spring and magnetic forces), the valve automatically opens to transmit the negative pressure to avoid premature leakage. By adjusting the number of effective spring turns, the opening pressure of the sealing valve can be changed to adapt to the pressure resistance requirements of different packaging boxes (such as fragile items requiring a lower negative pressure). The sealing sleeve rises with the packaging box to form an independent sealing unit. After the negative pressure is transmitted, the sealing film is immediately adsorbed to fit tightly against the box opening, maintaining the vacuum degree of the cavity before heat sealing, eliminating the problem of loose sealing caused by leakage in traditional equipment.

[0017] After opening, the magnetic pole action is reversed (repulsion becomes attraction), which helps maintain the open state and ensures efficient transmission of negative pressure; when resetting, the magnetic force and spring work together to accelerate the closing and improve the response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a clamping type automatic vacuum packaging machine in the present invention; Figure 2 Schematic diagram of the structure of the upper sealing shell and the lower sealing shell in the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure; Figure 4 Schematic diagram of the cross-sectional structure of the lower sealing shell of the present invention; Figure 5 Schematic diagram of the structure of the lower sealed shell and the box in the present invention; Figure 6Schematic cross-sectional structure diagram of the upper sealing shell in the present invention; Figure 7 Schematic cross-sectional structure diagram of the suction pipe and the magnetic ring in the present invention; Figure 8 Schematic cross-sectional structure diagram of the middle rod in the present invention; Figure 9 Schematic cross-sectional structure diagram of the suction pipe in the present invention; Figure 10 Schematic structure diagram of the self-suction pipe in the present invention; Figure 11 Schematic cross-sectional structure diagram of the self-suction pipe in the present invention.

[0019] In the figure: 11, lower sealing shell; 21, sealing sleeve; 22, suction pipe; 23, limit sleeve; 24, tension spring; 25, fixing ring; 26, stud; 27, screw rod; 28, one-way disc; 29, middle rod; 31, self-suction pipe; 32, suction cup; 33, suction disc; 34, pressure rod; 35, return spring; 36, communication hole; 210, magnetic head; 211, magnetic ring; 212, through groove; 213, positioning rod; 214, fixing bracket; 215, positioning groove; 216, gripper; 217, clamping plate; 218, conveying roller; 219, sealing film; 220, conveyor; 221, top rod; 222, upper sealing shell; 223, top spring; 224, pressing plate; 225, spring; 226, heating block; 227, cutting blade; 228, reducer; 229, motor; 230, rocker plate; 231, follower plate; 232, synchronization block; 233, reciprocating rod; 234, piston rod; 235, box; 236, bottom plate. Detailed implementation manners

[0020] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0021] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0022] In the present invention, unless otherwise stated, the orientations such as "upper, lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are usually the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contour of each component itself, but the above orientation terms do not limit the present invention.

[0023] Please refer to Figures 1 to 11, A clamping type automatic vacuum packaging machine, including a lower sealing shell 11; It also includes a negative pressure mechanism. The negative pressure mechanism includes a sealing sleeve 21 installed on the lower sealing shell 11. A plurality of suction pipes 22 are equidistantly installed on the sealing sleeve 21. A limiting sleeve 23 is installed inside the suction pipe 22. A tension spring 24 is installed between the upper ends of the limiting sleeve 23 and the suction pipe 22. A plurality of fixing rings 25 are equidistantly installed on the tension spring 24. A stud 26 is threadedly installed on the fixing ring 25. A screw rod 27 is coaxially installed at the lower end of the stud 26. A one-way disc 28 is fitted on the limiting sleeve 23. The screw rod 27 is threadedly connected inside the one-way disc 28. The pitch of the stud 26 and the one-way disc 28 is the same. An intermediate rod 29 is coaxially installed on the one-way disc 28. A plurality of magnetic heads 210 are installed on the side wall of the intermediate rod 29. A magnetic ring 211 is installed on the inner wall of the suction pipe 22. A through groove 212 is provided on the magnetic ring 211. The magnetic ring 211 and the magnetic heads 210 are set with the same pole. The negative pressure mechanism includes a positioning rod 213 and a fixing frame 214 installed inside the suction pipe 22. A positioning groove 215 is opened inside the intermediate rod 29. The positioning rod 213 is slidably connected in the positioning groove 215. A gripper 216 is installed on the fixing frame 214. Two clamping plates 217 are installed at both ends of the gripper 216. Conveyor rollers 218 are respectively installed at both ends of the fixing frame 214. A sealing film 219 is respectively wound and connected on the two conveyor rollers 218. A plurality of conveyors 220 are installed on the fixing frame 214. A plurality of top rods 221 are installed on the fixing frame 214. An upper sealing shell 222 is slidably installed on the plurality of top rods 221. A top spring 223 is sleeved on the top rod 221. The top spring 223 abuts inside the upper sealing shell 222. A pressing plate 224 is installed at the lower end of the top rod 221. A plurality of groups of springs 225 are installed at the lower end of the pressing plate 224. A plurality of heating blocks 226 are installed on the plurality of groups of springs 225. Cutting blades 227 sleeved on the heating blocks 226 are installed on the pressing plate 224. A speed reducer 228 is installed on the fixing frame 214. A motor 229 is installed on the speed reducer 228. A rocker plate 230 is installed at the extending end of the speed reducer 228. The other end of the rocker plate 230 is rotatably connected to a follower plate 231. The follower plate 231 is rotatably connected to a synchronizing block 232. Two reciprocating rods 233 are installed on the synchronizing block 232. The two reciprocating rods 233 are connected to the lower sealing shell 11. A plurality of piston rods 234 are hermetically slidably connected on the lower sealing shell 11. And the lower ends of the plurality of piston rods 234 are fixedly connected to the fixing frame 214. A plurality of boxes 235 are installed inside the sealing sleeve 21. The sealing film 219 abuts on the lower sealing shell 11. A bottom plate 236 is fixedly installed on the piston rod 234. A self-suction pipe 31 is installed on the bottom plate 236.

[0024] When sealing the corresponding box 235 and driving the sealing film 219 to move accordingly by the conveying rollers 218 on both sides, first, a plurality of boxes 235 are conveyed to the corresponding positions by the conveyor 220, and then the clamping plates 217 on both sides can be driven by the gripper 216 to move in a clamping manner. While loading, the sealed boxes 235 are unloaded. In the initial state, the lower sealing shell 11 is at the lowest position. At this time, the box 235 is placed on a plurality of bottom plates 236 by the two clamping plates 217, and then it is adsorbed and positioned with a small force by the suction cup 32. Then, the motor 229 is started, and the rocker 230 is driven to rotate by the speed reducer 228. Then, the synchronous block 232 is pulled upward by the follower plate 231. At this time, the reciprocating rod 233 moves upward accordingly. Since the reciprocating rod 233 abuts against the lower sealing shell 11, the lower sealing shell 11 will be driven to move upward. Since the piston rod 234 is fixedly installed on the fixed frame 214, the piston rod 234 will seal and slide with the lower sealing shell 11. Then, the volume inside the lower sealing shell 11 decreases, and the end gas is sucked into the lower sealing shell 11. As it continues to rise, when a plurality of sealing sleeves 21 abut against the box 235, the box 235 will be driven to move upward. The initial adsorption force provided by the suction cup 32 ensures the sealed fit between the box 235 and the sealing sleeve 21. As it continues to move upward, a plurality of sealing sleeves 21 are sealed by the box 235, and then the inside of the lower sealing shell 11 is in a sealed state. Since the one-way disc 28 is in a sealed state under the action of the tension spring 24 and the magnetic force, the negative pressure at the lower end will not be transmitted to the upper end. As it continues to move upward, the lower sealing shell 11 will abut against the upper sealing shell 222 and apply pressure. The upper sealing shell 222 seals a plurality of sealing sleeves 21 separately and presses the sealing film 219 on a plurality of sealing sleeves 21. At this time, the box 235 has not moved to the position of the heating block 226, and the position of the box 235 is lower than the position of the sealing film 219. When a plurality of sealing sleeves 21 are in a sealed state, a plurality of suction pipes 22 at this time unseal the negative pressure transmission of the lower sealing shell 11 to the sealing film 219, causing the sealing film 219 to move downward and fit on the box 235. At this time, the lower sealing shell 11 continues to move upward until the heating block 226 presses on the sealing film 219. At this time, heating is immediately carried out to heat-seal the sealing film 219 on the box 235, and at this time, the negative pressure has no time to leak, so the effect of the negative pressure is ensured. As the heat-sealing progresses, the lower sealing shell 11 will continue to move upward until the cutting knife cuts the sealing film 219, thus completing the sealing process. As the cutting knife cuts the sealing film 219, the atmospheric pressure is restored, and then it moves downward, causing the box 235 to abut against the bottom plate 236. After unsealing, the connection between the box 235 and the sealing sleeve 21 is released, and then it is unloaded with the clamping plate 217, and a new box 235 is placed on the bottom plate 236, thus completing a cycle.

[0025] As the pressure continues to decrease, the pressure acting on the one-way disk 28 continues to increase. Since the stud 26 is connected to the fixed ring 25, it will drive the tension spring 24 to move downward, and the magnetic ring 211 and the magnetic head 210 are set with the same polarity, so a thrust will be generated. As the negative pressure exceeds the sum of the tension force and the magnetic force of the tension spring 24, the one-way disk 28 moves downward, unlocking the seal between it and the limit sleeve 23. At this time, the thrust of the magnetic head 210 and the magnetic ring 211 is in the opposite direction, and then the magnetic force and the tension are in the opposite direction. Before opening, the tension and the magnetism work together to ensure the sealing effect. As a result, after the seal is released, the magnetic force and the pulling force are in opposite directions, which will help to continuously open and ensure the transmission of negative pressure. When the transmission is completed, it will reset because the pulling force is greater than the magnetic force, ensuring the next sealing negative pressure effect. Since the stud 26 can be connected to different numbers of fixed rings 25, the effective number of turns of the tension spring 24 can be changed, thereby changing the stiffness coefficient of the tension spring 24, and then changing the tension generated per unit distance, so that it can be adjusted accordingly according to different situations, ensuring that the seal of the one-way disc 28 can be released after the sealing sleeve 21 is sealed.

[0026] The self-priming mechanism includes a self-priming pipe 31 and a suction cup 32 installed on the self-priming pipe 31. A suction cup 33 is slidably installed in the self-priming pipe 31. The suction cup 33 is sealingly and slidably connected in the self-priming pipe 31. A pressure rod 34 is installed at the upper end of the suction cup 33, and a return spring 35 is installed at the lower end of the suction cup 33. The return spring 35 is connected to the self-priming pipe 31. A connecting hole 36 is opened at the lower end of the self-priming pipe 31.

[0027] When the box 235 is pressed on the pressure rod 34 and fits on the suction cup 32, the pressure rod 34 will be driven to move downward, and the suction cup 33 will move downward to generate negative pressure, so that the suction cup 32 is adsorbed on the box 235, providing a small force positioning. When it moves upward, the seal will be released so that it can easily proceed to the next operation.

[0028] In all the schemes mentioned above, the connection between the two parts can be selected according to actual conditions by welding, bolt and nut connection, bolt or screw connection or other well-known connection methods, which will not be described here one by one. In the above, all fixed connections are preferably considered to be welding. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping type automatic vacuum packaging machine, comprising a lower sealing shell (11); characterized in that: It further includes a negative pressure mechanism, the negative pressure mechanism includes a sealing sleeve (21) installed on the lower sealing shell (11), a plurality of suction pipes (22) are installed on the sealing sleeve (21) at equal intervals, a limiting sleeve (23) is installed inside the suction pipe (22), a tension spring (24) is installed between the upper ends of the limiting sleeve (23) and the suction pipe (22), a plurality of fixing rings (25) are installed on the tension spring (24) at equal intervals, a stud (26) is installed on the fixing ring (25) by threading, a screw rod (27) is coaxially installed at the lower end of the stud (26), a one-way disc (28) is fitted and installed on the limiting sleeve (23), the screw rod (27) is threadedly connected inside the one-way disc (28), the pitch of the stud (26) and the one-way disc (28) is the same, an intermediate rod (29) is coaxially installed on the one-way disc (28), a plurality of magnetic heads (210) are installed on the side wall of the intermediate rod (29), a magnetic ring (211) is installed on the inner wall of the suction pipe (22), a through groove (212) is provided on the magnetic ring (211), and the magnetic ring (211) and the magnetic heads (210) are arranged with the same polarity; it further includes a self-suction mechanism, the self-suction mechanism includes a self-suction pipe (31) and a suction cup (32) installed on the self-suction pipe (31).

2. The clamping type automatic vacuum packaging machine according to claim 1, wherein: The negative pressure mechanism includes a positioning rod (213) and a fixing frame (214) installed inside the suction pipe (22), a positioning groove (215) is opened inside the intermediate rod (29), and the positioning rod (213) is slidably connected inside the positioning groove (215).

3. The clamping type automatic vacuum packaging machine according to claim 2, characterized in that: A gripper (216) is installed on the fixing frame (214), two clamping plates (217) are installed at both ends of the gripper (216), conveying rollers (218) are respectively installed at both ends of the fixing frame (214), a sealing film (219) is wound and connected on the two conveying rollers (218) respectively, and a plurality of conveyors (220) are installed on the fixing frame (214).

4. The clamping type automatic vacuum packaging machine according to claim 3, characterized in that: A plurality of top rods (221) are installed on the fixing frame (214), an upper sealing shell (222) is slidably installed on the plurality of top rods (221), a top spring (223) is sleeved on the top rod (221), the top spring (223) abuts inside the upper sealing shell (222), and a pressing plate (224) is installed at the lower end of the top rod (221).

5. The clamping type automatic vacuum packaging machine according to claim 4, characterized in that: A plurality of groups of springs (225) are installed at the lower end of the pressing plate (224), a plurality of heating blocks (226) are installed on the plurality of groups of springs (225), and a plurality of cutting blades (227) sleeved on the heating blocks (226) are installed on the pressing plate (224).

6. The clamping type automatic vacuum packaging machine according to claim 5, characterized in that: A speed reducer (228) is installed on the fixing frame (214), a motor (229) is installed on the speed reducer (228), a swing plate (230) is installed on the extending end of the speed reducer (228), the other end of the swing plate (230) is rotatably connected to a follower plate (231), the follower plate (231) is rotatably connected to a synchronous block (232), two reciprocating rods (233) are installed on the synchronous block (232), and the two reciprocating rods (233) are connected to the lower sealing shell (11).

7. The clamping type automatic vacuum packaging machine according to claim 6, wherein: A plurality of piston rods (234) are hermetically and slidably connected to the lower sealing shell (11), and the lower ends of the plurality of piston rods (234) are fixedly connected to the fixing frame (214). A plurality of boxes (235) are installed in the sealing sleeve (21), and the sealing film (219) is attached to the lower sealing shell (11).

8. The clamping type automatic vacuum packaging machine according to claim 7, wherein: A bottom plate (236) is fixedly installed on the piston rod (234), and the self-suction pipe (31) is installed on the bottom plate (236).

9. The clamping type automatic vacuum packaging machine according to claim 1, characterized in that: An air suction disc (33) is slidably installed in the self-suction pipe (31), the air suction disc (33) is hermetically and slidably connected in the self-suction pipe (31), a pressure rod (34) is installed at the upper end of the air suction disc (33), a return spring (35) is installed at the lower end of the air suction disc (33), and the return spring (35) is connected to the self-suction pipe (31).

10. The clamping type automatic vacuum packaging machine according to claim 1, characterized in that: A communication hole (36) is opened at the lower end of the self-suction pipe (31).

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