An automatic vacuum film wrapping equipment and wrapping method for bacon

Abstract

This invention relates to the field of vacuum packaging, specifically to an automatic vacuum-sealed packaging device and method for cured meat. It includes a placement platform with positioning grooves for placing cured meat trays, a negative pressure channel, and a vacuum pump connected thereto; a sealing cap capable of vertical movement; a film conveying mechanism for conveying the packaging film above the placement platform; and a film leveling mechanism including a clamping assembly and a lifting assembly. The clamping assembly includes two clamps symmetrically arranged on both sides of the width of the placement platform. The lifting assembly includes an annular top frame and a lifting driver. This invention clamps the edges of the packaging film using the clamps on both sides, and the annular top frame lifts the center of the packaging film to create a pre-tensioned state. Subsequently, the upper sealing ring moves down with the sealing cap to press against the lower sealing ring on the annular top frame for sealing and vacuuming, ensuring the packaging film adheres to the cured meat tray and improving the flatness of the coating.

Description

Technical Field

[0001] This invention relates to the field of vacuum packaging, specifically to an automatic vacuum coating packaging equipment and method for cured meat. Background Technology

[0002] Currently, vacuum wrapping is the most common method for packaging cured meat. Existing technology typically involves placing the cured meat in a tray, covering it with a plastic film, and then using negative pressure to ensure the film adheres tightly to the product surface and removes air, thus achieving a close-fitting vacuum packaging.

[0003] A Chinese patent authorization announcement number CN223200387U discloses a type of cured meat packaging and coating equipment, which includes a box body. Several carrier frames are slidably connected to the box body. The carrier frames are connected to the side walls of the box body with built-in drive mechanisms. Several clamping columns are slidably connected between the frame plates on both sides of the carrier frames. Electric heating plates are provided on the opposite surfaces between the clamping columns. The outer end face of the outermost clamping column is longitudinally connected to the output end of the push cylinder on the carrier frame. A vacuum cover is provided above the opening of the box body. Several sets of sealing mechanisms are longitudinally provided inside the vacuum cover. The sealing mechanisms are located between two adjacent carrier frames.

[0004] According to the aforementioned patent, the film in the patent lacks effective leveling before vacuuming. Due to the elastic shrinkage characteristics of the film itself, it is prone to loosening, wrinkling, or edge displacement after being laid out. This results in the film not being able to uniformly adhere to the product contour during the subsequent vacuuming process, which not only affects the appearance but may also cause wrinkles or gaps in the edge area, reducing the reliability of the seal.

[0005] Therefore, there is a need for an automatic vacuum coating packaging equipment for cured meat, which has the functions of film pre-tensioning and active leveling to ensure that the film closely fits the outline of the cured meat and tray during the vacuum adsorption process, thereby effectively improving the packaging appearance quality and sealing reliability. Summary of the Invention

[0006] To address the problems existing in the prior art, an automatic vacuum film-coating packaging device for cured meat is provided. The device clamps the edges of the packaging film with clamps on both sides, and lifts the middle of the packaging film to form a pre-tensioned state by an annular top frame. Then, the upper sealing ring moves down with the sealing cover to press the lower sealing ring on the annular top frame to seal and draw a vacuum, so that the packaging film fits the cured meat tray box and improves the flatness of the film coating.

[0007] To address the problems of existing technologies, this invention provides an automatic vacuum-sealing packaging device for cured meat, used for vacuum-sealing cured meat in trays. The device includes a placement platform with a plurality of positioning slots arranged in a matrix for placing the cured meat trays, a negative pressure channel, and a vacuum pump connected thereto, forming a vacuum system. A sealing cap is positioned above the placement platform and is movable vertically. When the sealing cap and the placement platform are closed, a sealed cavity is formed between them. A film conveying mechanism is used to continuously convey packaging film to the top of the placement platform. The packaging film is positioned between the placement platform and the sealing cap. The film leveling mechanism includes a clamping assembly and a lifting assembly that cooperates with it. The clamping assembly includes two clamps symmetrically arranged on both sides of the width direction of the placement platform to clamp the edge of the packaging film. The clamped edge of the packaging film is located outside the placement platform. The lifting assembly is located below the sealing cap and includes an annular top frame arranged around the outer periphery of the placement platform and a lifting driver for driving its lifting and lowering. During the upward movement of the annular top frame, the annular top frame abuts against the lower surface of the packaging film.

[0008] Preferably, the lower surface of the sealing cap is provided with an upper sealing ring that surrounds it, and the upper surface of the annular top frame is provided with a lower sealing ring that surrounds it. When the upper and lower sealing rings are closed, the packaging film is in a sealed and compressed state.

[0009] Preferably, a first guide rod is provided around the placement platform along the vertical direction. The upper end of the first guide rod passes through the annular top frame and the sealing cover in sequence and extends upward, and slides with both. A limiting block is fixedly provided on the first guide rod above the annular top frame to limit the upward travel of the annular top frame.

[0010] Preferably, the clamp includes an upper clamping plate and a lower clamping plate, and a clamping driver. The upper clamping plate and the lower clamping plate are arranged opposite to each other, and the two ends of each clamping plate protrude along the packaging film conveying direction. The edge of the packaging film passes through the upper clamping plate and the lower clamping plate and is continuously conveyed.

[0011] Preferably, a second guide rod is provided around the placement platform along the vertical direction. The upper end of the second guide rod passes through the lower clamping plate and the upper clamping plate in sequence and extends upward. The lower clamping plate is fixedly connected to two second guide rods on the corresponding side, and the upper clamping plate is slidably engaged with two second guide rods on the corresponding side. An anti-detachment ring is fixedly provided at the upper end of the second guide rod.

[0012] Preferably, one of the two clamps is provided with an air blowing channel for blowing air to smooth out wrinkles on the film surface. The air outlet of the air blowing channel is horizontally oriented towards the placement platform. When the annular top frame is pushed up to contact the limiting block, the surface of the packaging film that is stretched is parallel to the air outlet.

[0013] Preferably, one of the two clamps is provided with an air suction groove, which is used to work with the air blowing groove to draw airflow to stabilize the film surface. The air outlet of the air suction groove is horizontally oriented towards the placement platform. When the annular top frame is pushed up to contact the limiting block, the surface of the packaging film that is stretched is parallel to the air outlet.

[0014] Preferably, the sealing cap is provided with a cutting pressure plate and a pressing driver for driving it to perform cutting action. The lower surface of the cutting pressure plate is provided with a cutting die that matches the shape of the cured meat tray at the position corresponding to each positioning groove, for cutting off excess packaging film along the edge of the tray after vacuum sealing is completed.

[0015] Preferably, the film conveying mechanism includes an unwinding roller and a rewinding roller, which are symmetrically arranged on both sides of the placement platform along the film conveying direction, for conveying the packaging film from the unwinding roller over the placement platform to the rewinding roller.

[0016] This invention also provides an automatic vacuum-sealed packaging method for cured meat, comprising the following steps:

[0017] S1. Place the tray containing the cured meat into the positioning slot of the placement table. The film conveying mechanism will convey the continuous packaging film from the unwinding roller to the take-up roller above the placement table, so that the packaging film covers all the trays.

[0018] S2. The upper and lower clamping plates of the clamping assembly close, clamping the two sides of the packaging film. The lifting driver drives the annular top frame to rise, pushing the middle of the packaging film upward to achieve pre-tensioning.

[0019] S3. The sealing cap moves downward, and the upper and lower sealing rings clamp the edge of the packaging film to form a sealed cavity. The vacuum pump draws air through the negative pressure channel, so that the packaging film adheres tightly to the surface of the cured meat and the tray.

[0020] S4. Under the drive of the pressure driver, the cutting plate cuts off the excess packaging film along the edge of the tray. The finished product is taken out, and the waste film is recycled by the winding roller, completing a single cycle operation.

[0021] The advantages of this application compared to the prior art are:

[0022] 1. The present invention uses clamps on both sides to clamp the edges of the packaging film after it is delivered to the position to form anchor points. At the same time, the annular top frame lifts the middle part of the packaging film from below, so that it can be uniformly pre-tensioned under the constraint of fixed edges and lifted middle.

[0023] The sealing cap then presses down, clamping the edges of the packaging film together with the annular top frame. A vacuum pump draws air through the negative pressure channel of the placement platform, causing the taut packaging film to adhere tightly to the outline of the cured meat and tray under atmospheric pressure. This process eliminates the need for heat sealing; the packaging film is mechanically held in place by the tray's inverted structure, achieving fully automated film coating of the cured meat and solving the problems of uneven adhesion and sealing failure caused by film looseness in traditional processes.

[0024] 2. This invention, by setting an upper sealing ring and a lower sealing ring on the sealing cap and the annular top frame respectively, clamps and seals the edge of the packaging film during mold closing, forming a complete airtight boundary, effectively preventing air leakage or film edge displacement during vacuuming.

[0025] Simultaneously, the annular top frame rises along the first guide rod, with its maximum stroke precisely limited by a limiting block, ensuring consistent lifting height each time and providing the packaging film with a stable pre-tension state. This achieves reliable sealing performance and precise tension control, avoiding film breakage due to over-lifting or wrinkles caused by insufficient tension, thus improving the sealing reliability of vacuum lamination.

[0026] 3. This invention, by setting air blowing channels and air suction channels on the top of the upper clamping plates of the two side clamps respectively, simultaneously activates the horizontal air blowing and suction channels after the packaging film is clamped at the edges and lifted and tightened in the middle. The airflow adheres and flows in a direction parallel to the film surface, using shear force, wall adhesion effect and negative pressure suction to gently disturb and flatten micro-wrinkles, while eliminating static electricity and balancing tension.

[0027] Because the packaging film is in a fully constrained state, the leveling process does not cause the packaging film to shift, and the airflow coverage area matches the entire row of trays, achieving efficient, non-contact dynamic leveling, further improving the flatness and stability of the film surface before lamination, and providing a reliable guarantee for subsequent vacuum adsorption to achieve a wrinkle-free and tight-fitting effect. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of an automatic vacuum coating packaging device for cured meat according to the present invention.

[0029] Figure 2 This is a three-dimensional exploded view of the automatic vacuum wrapping packaging equipment for cured meat according to the present invention from a first perspective.

[0030] Figure 3 This is a three-dimensional exploded view of the automatic vacuum wrapping packaging equipment for cured meat according to the present invention from a second perspective.

[0031] Figure 4 This is a partial three-dimensional structural cross-sectional view of an automatic vacuum coating packaging device for cured meat according to the present invention.

[0032] Figure 5 This is the invention Figure 4 Enlarged diagram of point A.

[0033] Figure 6 This is a three-dimensional structural diagram of an automatic vacuum film-coating packaging device for cured meat according to the present invention, showing the removal of the sealing cap.

[0034] Figure 7 This is a partial three-dimensional cross-sectional view of the automatic vacuum wrapping packaging equipment for cured meat of the present invention after removing the sealing cap.

[0035] Figure 8 This is a planar cross-sectional view of the packaging film of an automatic vacuum coating packaging device for cured meat according to the present invention, in its normal placement state.

[0036] Figure 9 This is a planar cross-sectional view of the packaging film of an automatic vacuum coating packaging device for cured meat according to the present invention, showing the film being pushed upwards.

[0037] Figure 10 This is a partial three-dimensional structural cross-sectional view of the annular top frame and clamp of an automatic vacuum coating packaging device for cured meat according to the present invention.

[0038] Figure 11 This is a three-dimensional structural diagram of the upper and lower clamping plates of an automatic vacuum wrapping packaging device for cured meat according to the present invention.

[0039] Figure 12 This is a three-dimensional structural diagram of the annular top frame of an automatic vacuum coating packaging device for cured meat according to the present invention.

[0040] The diagram is labeled as follows: 1. Tray; 2. Packaging film; 21. Unwind roller; 22. Rewind roller; 3. Placement platform; 31. Negative pressure channel; 32. First guide rod; 321. Limiting block; 33. Second guide rod; 331. Anti-detachment ring; 4. Sealing cap; 41. Upper sealing ring; 42. Cutting plate; 421. Die; 43. Lower pressure driver; 431. Guide shaft; 5. Fixture; 51. Upper clamping plate; 511. Air blowing channel; 512. Air suction channel; 52. Lower clamping plate; 53. Clamping driver; 6. Lifting assembly; 61. Annular top frame; 611. Lower sealing ring; 62. Lifting driver. Detailed Implementation

[0041] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0042] See Figures 1-6As shown, an automatic vacuum-sealing packaging device for cured meat is used to vacuum-seale cured meat placed in trays 1. It includes a placement platform 3 with a plurality of positioning slots arranged in a matrix on the platform 3 for placing the cured meat trays 1, and a negative pressure channel 31 connected to it and a vacuum pump, forming a vacuum system; a sealing cap 4, positioned above the placement platform 3 and movable vertically, forming a sealed cavity when the sealing cap 4 and the placement platform 3 are closed; and a film conveying mechanism for conveying continuous packaging film 2 to the top of the placement platform 3, so that the packaging film 2 is positioned... Between the placement platform 3 and the sealing cap 4; a film leveling mechanism, including a clamping assembly and a lifting assembly 6 that cooperates with it. The clamping assembly includes two clamps 5, which are symmetrically arranged on both sides of the width direction of the placement platform 3 for clamping the edge of the packaging film 2. The clamped edge of the packaging film 2 is located outside the placement platform 3. The lifting assembly 6 is located below the sealing cap 4 and includes an annular top frame 61 arranged around the outer periphery of the placement platform 3 and a lifting driver 62 for driving its lifting and lowering. During the upward movement of the annular top frame 61, the annular top frame 61 abuts against the lower surface of the packaging film 2.

[0043] A lifting driver is installed on the placement platform 3 directly above the sealing cover 4. The sealing cover 4 is fixedly connected to the output end of the lifting driver. The lifting driver can be one of a cylinder, a hydraulic cylinder or an electric push rod, used to drive the sealing cover 4 to move in the vertical direction, so as to realize the automatic pressing and sealing or opening of the placement platform 3.

[0044] The lifting driver 62 includes lifting cylinders disposed around the annular top frame 61. The lifting cylinders are mounted on the placement platform 3, and the output shafts of the corresponding lifting cylinders are fixedly connected to the four sides of the annular top frame 61.

[0045] In the automatic vacuum film packaging equipment for cured meat, the entire leveling and positioning process before film coating is precisely completed through the coordinated actions of the placement platform 3, the sealing cap 4, the film conveying mechanism, and the film leveling mechanism.

[0046] Specifically, firstly, multiple trays 1 containing cured meat are placed in a matrix arrangement into the corresponding positioning slots on the placement platform 3, ensuring that each tray 1 is accurately and stably positioned. At the same time, the film conveying mechanism is activated, smoothly conveying a continuous sheet of packaging film 2 horizontally to directly above the placement platform 3, so that the entire sheet of packaging film 2 covers all the trays 1 and hangs naturally on both sides of the placement platform 3. At this time, the packaging film 2 is in a relaxed state and has not yet been stressed.

[0047] Once the packaging film 2 is in place, the film conveying mechanism pauses operation and enters the leveling preparation stage. Immediately afterwards, two clamps 5 located on either side of the placement platform 3, perpendicular to the conveying direction of the packaging film 2, move synchronously. The two clamps 5 correspond to the left and right edges of the packaging film 2, i.e., the clamped edges. After the clamps 5 close, they firmly clamp the two edges of the packaging film 2, forming two stable lateral anchoring points.

[0048] Based on this, the lifting assembly 6, located below the placement platform 3, begins to operate. Upon triggering the clamping completion signal, all lifting cylinders extend upwards synchronously, pushing the annular top frame 61 to rise smoothly vertically. Since the edges of the packaging film 2 are firmly fixed by the clamps 5 on both sides, when the annular top frame 61 pushes upwards from the lower center, the middle of the packaging film 2 is forcibly lifted, forming an upwardly taut surface. This effectively stretches and eliminates any looseness or wrinkles caused by its own weight or material elasticity, leaving the packaging film 2 in a uniformly pre-taut state.

[0049] The outline of the annular top frame 61 matches the outer edge of the placement platform 3, and its rising height is precisely controlled by the stroke of the lifting cylinder, ensuring sufficient tension while avoiding excessive lifting that could cause the packaging film 2 to rupture. This pre-tensioned state lays a crucial foundation for the subsequent vacuuming stage.

[0050] When the sealing cap 4 presses down and tightens the packaging film 2 onto the annular top frame 61, a lower sealing cavity is formed between the packaging film 2 and the placement platform 3. The vacuum pump is activated, and the air inside the cavity is quickly removed through the negative pressure channel 31 inside the placement platform 3. Under atmospheric pressure, the pre-stretched packaging film 2 can quickly, evenly, and wrinkle-free adhere to the surface and contour of each cured meat tray 1, especially tightly covering the uneven parts of the cured meat, improving the appearance quality and sealing consistency of the film. This solves the problems of poor adhesion and sealing failure caused by film looseness in traditional film lamination processes.

[0051] See Figures 4-7 and Figure 12 As shown, the lower surface of the sealing cap 4 is provided with an upper sealing ring 41 that surrounds it, and the upper surface of the annular top frame 61 is provided with a lower sealing ring 611 that surrounds it. When the upper sealing ring 41 and the lower sealing ring 611 are closed, the packaging film 2 is in a sealed and compressed state.

[0052] After the film is flattened, the sealing cap 4 begins to move vertically downwards, approaching the pre-tensioned packaging film 2. At this time, the upper sealing ring 41 on the lower surface of the sealing cap 4 gradually approaches the lower sealing ring 611 on the upper surface of the annular top frame 61. When the sealing cap 4 continues to descend until it contacts the annular top frame 61, the upper sealing ring 41 and the lower sealing ring 611 press against each other, tightly clamping the edge area of ​​the packaging film 2 located between them.

[0053] Since both the upper sealing ring 41 and the lower sealing ring 611 are closed annular structures surrounding the placement platform 3, they form a closed boundary around the outer periphery of the packaging film 2 after being pressed together. In this state, the packaging film 2 is firmly sealed and pressed, and its edges will not slip due to the negative pressure generated by vacuuming, nor will they loosen due to external disturbances. This ensures that the cavity formed between the placement platform 3 and the sealing cap 4 has reliable airtightness during subsequent vacuuming processes, providing a guarantee for efficient and stable vacuum coating.

[0054] See Figures 4-7 and Figure 10 As shown, the placement platform 3 is provided with first guide rods 32 along the vertical direction around it. The upper end of the first guide rods 32 passes through the annular top frame 61 and the sealing cover 4 in sequence and extends upward, and slides with both. The first guide rods 32 are fixedly provided with a limiting block 321 above the annular top frame 61 to limit the upward stroke of the annular top frame 61.

[0055] When the lifting driver 62 starts and pushes the annular top frame 61 upward, the annular top frame 61 rises synchronously along the first guide rod 32. As it continues to rise, the upper surface of the annular top frame 61 finally contacts and abuts against the limiting block 321 fixed on the first guide rod 32. At this time, the limiting block 321 prevents the annular top frame 61 from continuing to rise, thereby precisely limiting its maximum upward stroke.

[0056] This limiting mechanism not only ensures the consistency of the lifting height each time, enabling the packaging film 2 to obtain a stable and repeatable pre-tensioning effect, but also effectively prevents the packaging film 2 from being torn or losing tension due to excessive lifting.

[0057] See Figures 4-11 As shown, the clamp 5 includes an upper clamping plate 51 and a lower clamping plate 52 and a clamping driver 53. The upper clamping plate 51 and the lower clamping plate 52 are arranged opposite each other. The two ends of each clamping plate protrude along the conveying direction of the packaging film 2. The edge of the packaging film 2 passes through the upper clamping plate 51 and the lower clamping plate 52 and is continuously conveyed.

[0058] During the conveying process of the packaging film 2, the two sides of the packaging film 2 pass through the upper clamping plate 51 and the lower clamping plate 52 of the corresponding clamping fixture 5 respectively. The upper clamping plate 51 and the lower clamping plate 52 are symmetrically arranged in a direction perpendicular to the surface of the packaging film 2, and their two ends extend outward from the placement platform 3 along the conveying direction of the packaging film 2 to form a through clamping channel.

[0059] During the conveying phase, the upper clamping plate 51 and the lower clamping plate 52 remain separated, allowing the packaging film 2 to pass freely and continuously between them without being affected by clamping resistance, ensuring smooth and stable film delivery. Once the packaging film 2 has been conveyed to the predetermined position, the clamping driver 53 is activated, driving the upper clamping plate 51 to move downwards vertically and close with the fixed lower clamping plate 52, firmly clamping the edges of the positioned packaging film 2. This ensures low-resistance passage of the packaging film 2 during conveying and provides reliable and stable clamping force after positioning, establishing precise boundary constraints for subsequent tensioning and leveling processes.

[0060] See Figures 4-11 As shown, the placement platform 3 is provided with second guide rods 33 along the vertical direction around its perimeter. The upper ends of the second guide rods 33 extend upward through the lower clamping plate 52 and the upper clamping plate 51 in sequence. The lower clamping plate 52 is fixedly connected to the two second guide rods 33 on the corresponding side, and the upper clamping plate 51 is slidably engaged with the two second guide rods 33 on the corresponding side. The upper end of the second guide rods 33 is fixedly provided with an anti-detachment ring 331.

[0061] The clamping driver 53 includes a clamping cylinder, which is mounted on the placement platform 3. The upper clamping plate 51 is located in the middle between the two second guide rods 33 and is fixedly connected to the output shaft of the clamping cylinder.

[0062] When the clamping cylinder retracts, it drives the upper clamping plate 51 to move downward along the second guide rod 33, closing with the lower clamping plate 52 to clamp the edge of the packaging film 2.

[0063] When the cylinder extends, the upper clamping plate 51 moves upward synchronously along the second guide rod 33, releasing the packaging film 2 for conveying. To prevent the upper clamping plate 51 from detaching from the second guide rod 33 during the upward movement, an anti-detachment ring 331 is fixedly provided at the top of the second guide rod 33 to mechanically limit the upward limit position of the upper clamping plate 51, thereby achieving reliable clamping and release actions.

[0064] See Figures 5-11 As shown, the top of the upper clamping plate 51 of one of the two clamps 5 is provided with an air blowing groove 511 along its length direction for blowing airflow to smooth the wrinkles on the film surface. The air outlet of the air blowing groove 511 is horizontally oriented towards the placement platform 3. When the annular top frame 61 is pushed up to contact the limiting block 321, the surface of the packaging film 2 that is stretched is parallel to the air outlet.

[0065] After the packaging film 2 is conveyed and clamped by the two side clamps 5, its edges are firmly fixed by the upper clamp 51 and the lower clamp 52, forming a stable boundary constraint. Then, the annular top frame 61 moves upward under the action of the lifting driver 62, lifting the middle of the packaging film 2, so that the entire film is evenly stretched and tightened under the condition that the edges are fixed and the middle is lifted.

[0066] In this state, the surface of the packaging film 2 is at a critical point of tension and flatness, but there may still be minor ripples or static wrinkles in some areas due to the release of internal material stress or slight thickness differences. At this time, the air duct 511 located on the top of the clamping plate 51 of the clamping fixture 5 on one side is activated, spraying a low-speed, uniform laminar airflow from its horizontal slit-type air outlet toward the placement platform 3. Since the film has been clamped and cannot be moved as a whole, the airflow cannot blow it away from its original position, but slides along its taut surface in a parallel attachment manner. Through the airflow shear force and wall adhesion effect, a gentle disturbance is applied to the micro-undulation area of ​​the film surface, causing the local relaxed fibers to redistribute and the micro-wrinkles to flatten.

[0067] The leveling process occurs when the packaging film 2 is fully constrained, preventing film displacement or offset while precisely targeting surface defects. Since the air duct 511 is positioned on top of the upper clamping plate 51 and arranged along the extension direction of the clamp 5, its airflow coverage can match the film area corresponding to the entire row of trays 1. This achieves further non-contact dynamic leveling without contacting or damaging the packaging film 2, improving surface consistency before lamination and laying the foundation for a tightly bonded finished product in the subsequent vacuum adsorption stage.

[0068] See Figures 5-11 As shown, the top of the upper clamping plate 51 of one of the two clamps 5 is provided with a suction groove 512 along its length direction, which is used to work with the blowing groove 511 to draw airflow to stabilize the film surface. The air outlet of the suction groove 512 is horizontally oriented towards the placement platform 3. When the annular top frame 61 is pushed up to contact the limiting block 321, the surface of the packaging film 2 that is stretched is parallel to the air outlet.

[0069] During the film lamination and leveling stage, when the packaging film 2 is clamped by the clamps 5 on both sides and the annular top frame 61 rises to contact the limiting block 321, the film is in a stable state with the edges fixed and the middle taut. At this time, the suction groove 512, which is located on the top of the clamping plate 51 on the other side of the clamp 5 and extends along its length, is activated simultaneously, and its horizontal air outlet facing the placement platform 3 remains parallel to the surface of the taut packaging film 2.

[0070] The suction slot 512 forms a directional airflow inlet on one side of the membrane through negative pressure suction, which, together with the airflow ejected from the blowing slot 511 on the opposite side, constitutes a horizontal blowing and suction airflow channel that penetrates the membrane surface. When the airflow passes through the membrane surface, it carries away static electricity and equalizes the surface tension, further enhancing the stability and flatness of the membrane surface.

[0071] See Figure 4 and Figure 5As shown, the sealing cover 4 is provided with a cutting plate 42 and a pressing driver 43 for driving it to perform cutting action. The lower surface of the cutting plate 42 is provided with a die 421 that matches the shape of the cured meat tray 1 at the position corresponding to each positioning groove, which is used to cut off the excess packaging film 2 along the edge of the tray 1 after vacuum coating is completed.

[0072] The edge of the tray 1 has an inverted structure that can hold the packaging film 2 in place.

[0073] The pressure drive 43 specifically adopts an electromagnetic drive structure. Two guide shafts 431 extending upward through the sealing cover 4 are symmetrically provided on the cutting pressure plate 42. The electromagnetic drive structure includes a fixed electromagnet and a movable electromagnet. The fixed electromagnet is fixedly connected to the sealing cover 4, and the movable electromagnet is fixedly connected to the guide shaft 431.

[0074] After vacuum coating is completed, the sealing cap 4 remains in the mold-closed state with the placement table 3, at which point the cutting process begins. The electromagnetic drive structure is energized, and a repulsive force is generated between the fixed electromagnet and the movable electromagnet, driving the movable electromagnet, along with the guide shaft 431 and the cutting pressure plate 42 fixedly connected to it, to move rapidly downward in the vertical direction.

[0075] When the pressure is applied to the correct position, the die 421 cleanly cuts off the excess packaging film 2 along the edge of the tray 1. Because the edge of the tray 1 has an inverted buckle structure, the packaging film 2 is mechanically clamped by the inverted buckle structure during the vacuuming process. Therefore, the finished product can firmly fix the packaging film 2 without heat sealing after cutting, achieving a reliable seal.

[0076] See Figure 1 As shown, the film conveying mechanism includes an unwinding roller 21 and a take-up roller 22. The unwinding roller 21 and the take-up roller 22 are symmetrically arranged on both sides of the placement platform 3 along the conveying direction of the packaging film 2, and are used to convey the packaging film 2 from the unwinding roller 21 through the top of the placement platform 3 to the take-up roller 22.

[0077] When the conveyor starts, the packaging film 2 unwinds from the unwind roller 21 and horizontally crosses over the placement table 3, covering the area of ​​the cured meat tray 1 placed thereon, and then continues to extend to the take-up roller 22 on the opposite side. After completing one film covering operation, the take-up roller 22 simultaneously winds up the excess edge material or waste film segments that have been cut and separated, ensuring a clean working area and achieving automatic material handling.

[0078] An automatic vacuum-sealing packaging method for cured meat, applied to the above-mentioned automatic vacuum-sealing packaging equipment for cured meat, includes the following steps:

[0079] S1. Place the tray 1 containing cured meat into the positioning groove of the placement platform 3. The film conveying mechanism conveys the continuous packaging film 2 from the unwinding roller 21 over the placement platform 3 to the winding roller 22, so that the packaging film 2 covers all the trays 1.

[0080] S2, the upper clamping plate 51 and lower clamping plate 52 of the clamping assembly are closed, clamping the two sides of the packaging film 2. The lifting driver 62 drives the annular top frame 61 to rise, pushing the middle of the packaging film 2 upward to achieve pre-tensioning.

[0081] S3, the sealing cap 4 moves down, the upper sealing ring 41 and the lower sealing ring 611 clamp the edge of the packaging film 2 to form a sealed cavity, the vacuum pump draws air through the negative pressure channel 31, so that the packaging film 2 is tightly attached to the surface of the cured meat and the tray 1.

[0082] S4. Under the drive of the pressure driver 43, the cutting plate 42 cuts off the excess packaging film 2 along the edge of the tray 1. The finished product is taken out, and the waste film is recycled by the winding roller 22, completing a single cycle operation.

[0083] This invention uses clamps 5 on both sides to clamp the edges of the packaging film 2 to form anchor points, and the annular top frame 61 simultaneously lifts the middle to achieve uniform pre-tensioning. On this basis, the blowing groove 511 and the suction groove 512 construct a transverse blowing and suction airflow channel to perform non-contact dynamic leveling of the packaging film 2 under complete constraint, effectively eliminating micro-wrinkles and stabilizing the film surface.

[0084] Subsequently, the sealing cap 4 is pressed down, clamping and sealing the edges of the packaging film 2 through the upper sealing ring 41 and the lower sealing ring 611, forming a reliable airtight cavity. Combined with the vacuum created by the negative pressure channel 31 on the placement platform 3, the flattened packaging film 2 adheres tightly to the contours of the cured meat and the tray 1 under atmospheric pressure. The entire process requires no heat sealing; mechanical holding is achieved through the inverted structure of the tray 1, and the lifting stroke is precisely controlled by the limit stop 321 to ensure stable tension and prevent film breakage or loosening. This solves the problems of uneven adhesion and sealing failure caused by film looseness and insufficient flatness in traditional processes, improving the flatness of the coating.

[0085] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An automatic vacuum-sealing packaging device for cured meat, used for vacuum-sealing cured meat in trays, characterized in that, include: The placement platform is provided with a matrix of positioning slots for placing cured meat trays, and is equipped with a negative pressure channel and a vacuum pump connected thereto, forming a vacuum system. A sealing cap is positioned above the placement platform and can move vertically. When the sealing cap and the placement platform are closed, a sealed cavity is formed between them. A film conveying mechanism is used to convey a continuous packaged film to a placement platform, so that the packaged film is positioned between the placement platform and the sealing cap; A film leveling mechanism, including a clamping assembly and a lifting assembly that works with it; The clamping assembly includes two clamps, which are symmetrically arranged on both sides of the width direction of the placement platform to clamp the edge of the packaging film. The clamped edge of the packaging film is located outside the placement platform. The lifting assembly is located below the sealing cover and includes an annular top frame surrounding the outer periphery of the placement platform and a lifting driver for driving its lifting and lowering. During the upward movement of the annular top frame, the annular top frame abuts against the lower surface of the packaging film. The lower surface of the sealing cap is provided with an upper sealing ring that surrounds it, and the upper surface of the annular top frame is provided with a lower sealing ring that surrounds it. When the upper and lower sealing rings are closed, the packaging film is in a sealed and compressed state. The placement platform is provided with first guide rods along the vertical direction around its perimeter. The upper ends of the first guide rods pass through the annular top frame and the sealing cover in sequence and extend upwards, and slide in cooperation with both. A limiting block is fixedly provided on the first guide rod above the annular top frame to limit the upward travel of the annular top frame.

2. The automatic vacuum coating packaging equipment for cured meat according to claim 1, characterized in that, The fixture includes an upper clamping plate and a lower clamping plate, as well as a clamping driver. The upper clamping plate and the lower clamping plate are arranged opposite each other, and the two ends of each clamping plate protrude along the packaging film conveying direction. The edge of the packaging film passes through the upper clamping plate and the lower clamping plate and is continuously conveyed.

3. The automatic vacuum coating packaging equipment for cured meat according to claim 2, characterized in that, The placement platform is provided with second guide rods along the vertical direction around its perimeter. The upper ends of the second guide rods extend upward through the lower clamping plate and the upper clamping plate in sequence. The lower clamping plate is fixedly connected to the two second guide rods on the corresponding side, and the upper clamping plate is slidably engaged with the two second guide rods on the corresponding side. The upper end of the second guide rod is fixedly provided with an anti-detachment ring.

4. The automatic vacuum coating packaging equipment for cured meat according to claim 1, characterized in that, One of the two clamps is equipped with an air blowing channel for blowing air to smooth out wrinkles on the film surface. The air outlet of the air blowing channel is horizontally oriented towards the placement platform. When the annular top frame is pushed up to contact the limiting block, the surface of the packaging film that is stretched is parallel to the air outlet.

5. The automatic vacuum coating packaging equipment for cured meat according to claim 4, characterized in that, One of the two clamps is equipped with a suction groove, which works in conjunction with the blowing groove to draw airflow to stabilize the film surface. The air outlet of the suction groove is horizontally oriented towards the placement platform. When the annular top frame is pushed up to contact the limiting block, the surface of the packaging film that is stretched is parallel to the air outlet.

6. The automatic vacuum coating packaging equipment for cured meat according to claim 1, characterized in that, The sealing cap is equipped with a cutting plate and a pressing driver for driving it to perform cutting action. The lower surface of the cutting plate is provided with a cutting die that matches the shape of the cured meat tray at the position corresponding to each positioning groove, which is used to cut off the excess packaging film along the edge of the tray after vacuum sealing is completed.

7. The automatic vacuum coating packaging equipment for cured meat according to claim 1, characterized in that, The film conveying mechanism includes an unwinding roller and a take-up roller, which are symmetrically arranged on both sides of the placement platform along the film conveying direction, and are used to convey the packaging film from the unwinding roller to the take-up roller above the placement platform.

8. An automatic vacuum-sealing packaging method for cured meat, applied to the automatic vacuum-sealing packaging equipment for cured meat as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Place the tray containing the cured meat into the positioning slot of the placement table. The film conveying mechanism will convey the continuous packaging film from the unwinding roller to the take-up roller above the placement table, so that the packaging film covers all the trays. S2. The upper and lower clamping plates of the clamping assembly close, clamping the two sides of the packaging film. The lifting driver drives the annular top frame to rise, pushing the middle of the packaging film upward to achieve pre-tensioning. S3. The sealing cap moves downward, and the upper and lower sealing rings clamp the edge of the packaging film to form a sealed cavity. The vacuum pump draws air through the negative pressure channel, so that the packaging film adheres tightly to the surface of the cured meat and the tray. S4. Under the drive of the pressure driver, the cutting plate cuts off the excess packaging film along the edge of the tray. The finished product is taken out, and the waste film is recycled by the winding roller, completing a single cycle operation.

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