Intelligent cutting and sealing assembly of preservative film packaging machine

Abstract

The invention relates to the technical field of preservative film packaging, in particular to an intelligent cutting and sealing assembly of a preservative film packaging machine, the intelligent cutting and sealing assembly comprises a box body and a roll-shaped preservative film rotatably arranged on the box body, a lifting element is arranged in the box body, a discharging port is formed in the top of the box body, sliding rails are arranged on the two sides of the discharging port in the box body, and the sliding rails are located above the lifting element; a movable block is slidably connected in the sliding rail, a first spring is arranged on one side, located on the movable block, in the sliding rail, first guide rollers are rotatably connected to the movable block, and the two first guide rollers are both in winding fit with the unfolded part of the preservative film, so that the preservative film is horizontally laid above the lifting element; a winding roller is rotationally connected into the box body, and the outer end of the preservative film is matched with the winding roller in a winding mode. In the working process, the situation that the pressure applied to an object by the preservative film is too large or too small is avoided, so that the packaging effect is guaranteed, the value of the pressure applied to the object by the preservative film can be adjusted according to needs, and the practicability of the packaging device is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh-keeping film packaging, and particularly to an intelligent cutting and sealing component of a fresh-keeping film packaging machine. Background Art

[0002] A fresh-keeping film packaging machine is an automated packaging device widely used in industries such as food and daily necessities. Its core function is to seal and wrap items with fresh-keeping film to extend the shelf life, maintain hygiene, and enhance the display effect of goods.

[0003] Chinese Patent No. CN105857698B discloses a fruit packaging machine, which includes a frame, a horizontal feeding device, a vertical feeding device, a fresh-keeping film conveying device, a clamping device, and a cutting device; the horizontal feeding table and the vertical feeding table are comb-tooth plates, the vertical feeding table vertically moves up and down through a screw nut, the clamping device includes two symmetric clamping plates on the left and right, the cutting device includes two knife plates in the front and back, and the fresh-keeping film is driven by a main rolling pressure roller and a secondary rolling roller. Through this invention, the automated packaging of fruits is realized, manual operation is minimized as much as possible, the packaging efficiency is improved, and at the same time, the use of fresh-keeping film packaging can also improve the freshness of fruits and ensure the beauty of the packaging.

[0004] During the actual use of this device, the vertical feeding table is responsible for smoothly and accurately pushing the fruits (items to be packaged) upward. When the fruits are lifted by the vertical feeding table, they will contact the fresh-keeping film above and push it up. This process utilizes the elastic characteristics of the fresh-keeping film itself. As the fruits continue to rise, the fresh-keeping film will gradually wrap around the fruits, forming a preliminary packaging form.

[0005] However, in actual operation, an issue that cannot be ignored is the diversity of the specifications of the items to be packaged. Taking stacked fruits as an example, when different numbers of fruits are stacked together, their overall height will vary significantly. This difference in specifications will directly affect the pressure exerted by the fresh-keeping film on the items.

[0006] When the height of the items is relatively low, or the number of stacked fruits is small, the degree of stretching of the fresh-keeping film during the wrapping process is relatively small. Therefore, the pressure exerted on the items will also decrease accordingly. This insufficient pressure will cause the fresh-keeping film to not adhere tightly to the items, making it difficult to form an effective restraint. More seriously, if the pressure is too small, there may be gaps between the fresh-keeping film and the items to be packaged, resulting in air leakage, which will affect the fresh-keeping effect and may even cause damage to the items during transportation or storage.

[0007] On the contrary, when the height of the item is relatively high or the number of stacked fruits is large, the plastic wrap will be stretched more during the wrapping process, and the pressure exerted on the item will increase accordingly. If the pressure is too high, it may cause deformation of the packaged item. Especially for some fruits with softer textures, this deformation may be more obvious. In addition, excessive pressure may also cause the plastic wrap to be punctured, not only failing to play a preservation role but also resulting in waste of packaging materials.

[0008] However, this device does not have a flexible adjustment ability to adapt to different specifications of packaged items and is difficult to control the pressure exerted by the plastic wrap on the packaged items. Therefore, the packaging effect of this device is not ideal. Summary of the Invention

[0009] In view of the above situation, to overcome the deficiencies of the prior art, the present invention provides an intelligent cutting and sealing component for a plastic wrap packaging machine to solve the above problems.

[0010] To achieve the above object, the technical solution adopted by the present invention is as follows: The intelligent cutting and sealing component of the plastic wrap packaging machine includes a box body and a roll of plastic wrap rotatably arranged on the box body. A lifting element is provided inside the box body and a discharge port is provided at the top. On both sides of the discharge port inside the box body, there are slide rails. The slide rails are located above the lifting element. An active block is slidably connected inside the slide rails. A first spring is provided on one side of the active block inside the slide rails. A first guiding roller is rotatably connected to the active block. Both first guiding rollers are wound and cooperated with the unfolded part of the plastic wrap, so that the plastic wrap is horizontally laid above the lifting element; A winding roller is rotatably connected inside the box body, and the outer end of the plastic wrap is wound and cooperated with the winding roller; A locking wheel is coaxially and fixedly connected to the first guiding roller. Two first cylinders are provided inside the box body. A stop member is provided at the free end of the first cylinder, and the locking wheel is engaged with the stop member.

[0011] Preferably, a second guiding roller is rotatably connected to the active block. The second guiding roller is located on the side of the first guiding roller close to the inner wall of the box body. The unfolded part of the plastic wrap passes through the gap between the first guiding roller and the second guiding roller.

[0012] Preferably, a pressure sensor is installed on the slide rail, and the sensing part of the pressure sensor matches the side of the first spring away from the active block.

[0013] Preferably, it further includes a third guiding roller rotatably connected inside the box body. The unfolded part of the plastic wrap is wound and cooperated with the third guiding roller. Both the winding roller and the third guiding roller are located between the two first guiding rollers; A first motor is installed on the box body, and the output end of the first motor is coaxially and fixedly connected to the winding roller.

[0014] Preferably, a fixed annular plate is fixedly connected to the top of the box body. A rotating annular plate is rotatably connected to the bottom of the fixed annular plate. A plurality of first guiding grooves are circumferentially arranged on the fixed annular plate with its own axis as the center. The arrangement direction of the first guiding grooves is perpendicular to the central axis of the fixed annular plate. A plurality of angular sealing plates are arranged between the fixed annular plate and the rotating annular plate. One side of the angular sealing plate is fixedly connected with a first guiding block. The first guiding groove is in sliding fit with the first guiding block. The nearly circular space surrounded by the multiple angular sealing plates is the discharge port.

[0015] Preferably, a second guiding groove is formed in the angular sealing plate. A second guiding block is slidably connected in the second guiding groove. A second spring is installed on one side of the second guiding block in the second guiding groove. A plurality of third guiding grooves are circumferentially arranged on the rotating annular plate with its own axis as the center. The bottom end of the second guiding block extends into the interior of the third guiding groove and is in sliding fit with the inner wall of the third guiding groove.

[0016] Preferably, an installation groove is formed on one side of the angular sealing plate. A cutting knife is slidably arranged in the installation groove. An elastic block is installed between the back of the cutting knife and the inner wall of the installation groove. A push rod is installed on the second guiding block. The other end of the push rod is matched with the back of the cutting knife.

[0017] Preferably, an arc-shaped rack is coaxially installed on the rotating annular plate. A second motor is installed on the fixed annular plate. A gear is coaxially and fixedly connected to the output end of the second motor. The arc-shaped rack is meshed with the gear.

[0018] Preferably, a second cylinder body is installed on the fixed annular plate. A limiting plate is arranged on one side of one of the first guiding blocks close to the discharge port. The free end of the second cylinder body is fixedly connected with the limiting plate.

[0019] The beneficial effects of the present invention are as follows: 1. During the working process of the present invention, the situation that the pressure of the plastic wrap applied to the article is too large or too small will not occur, thus ensuring the packaging effect. Moreover, the present invention can also adjust the pressure value of the plastic wrap applied to the article according to needs, further improving the practicability of the present invention.

[0020] 2. Different from the traditional packaging method that continuously presses the plastic wrap to the middle part of the bottom side of the tray and then cuts it, the cutting knife extends out before reaching the middle position in the present invention, so that the distribution of the plastic wrap on the bottom side of the tray shows a shape of low in the middle and high on the outside, avoiding the middle bulge phenomenon caused by the stacking of multiple layers of plastic wrap in the traditional method. On the contrary, the plastic wrap is moderately stacked and adhered at the edge of the bottom side of the tray, forming a stable support structure, effectively improving the overall stability of the tray.

[0021] 3. During the working process of the present invention, when the discharge port is reduced to a set value, the plastic wrap cutting work is carried out. The present invention can adjust this set value according to requirements to ensure that the present invention is applicable to articles of different specifications. When the article specifications remain unchanged, the distribution amount of the plastic wrap on the bottom side of the tray can also be adjusted according to requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention.

[0023] Figure 2 is a schematic top view structural diagram of the present invention.

[0024] Figure 3 is a schematic sectional structural view of the present invention Figure 1 .

[0025] Figure 4 is a schematic sectional structural view of the present invention Figure 2 .

[0026] Figure 5 is of the present invention Figure 3 is a schematic structural diagram of the partial enlargement at A in the present invention.

[0027] Figure 6 is a schematic structural diagram of the installation of the locking wheel of the present invention.

[0028] Figure 7 is a schematic structural diagram of the rotating annular plate of the present invention.

[0029] Figure 8 is a schematic sectional structural diagram of the angled sealing plate of the present invention.

[0030] Figure 9 is a schematic structural diagram of the bottom of the present invention after the article packaging is completed.

[0031] In the drawings: 1. Box body; 2. Plastic wrap; 3. Slide rail; 4. First spring; 5. Rewinding roller; 6. Lifting element; 7. First guide roller; 8. Locking wheel; 9. First cylinder body; 10. Stopper; 11. Movable block; 12. Second guide roller; 13. Pressure sensor; 14. Third guide roller; 15. Fixed annular plate; 16. Rotating annular plate; 17. First guide groove; 18. Angled sealing plate; 19. First guide block; 20. Second guide groove; 21. Second guide block; 22. Second spring; 23. Third guide groove; 24. Installation groove; 25. Cutter; 26. Elastic block; 27. Push rod; 28. First motor; 29. Arc-shaped rack; 30. Second motor; 31. Gear; 32. Discharge port; 33. Second cylinder body; 34. Limiting plate. DETAILED DESCRIPTION OF THE INVENTION

[0032] The following will refer to the reference Figures 1 to 9The embodiments of the present invention will be described in detail. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0033] The intelligent cutting and sealing component of the fresh-keeping film packaging machine, as Figures 1 - 3 and Figure 5 shown, includes a box body 1 and a roll-shaped fresh-keeping film 2 rotatably arranged on the box body 1. In this embodiment, the fresh-keeping film 2 is wound around a rotatable central roller to present the form of a roll-shaped fresh-keeping film 2. When the fresh-keeping film 2 is drawn out, the central roller will drive its rolled part to rotate; a lifting element 6 is arranged in the box body 1 and a discharge port 32 is arranged at the top. The lifting element 6 is composed of an electric telescopic rod, a bearing table, etc., which is prior art and will not be elaborated too much. The lifting element 6 is used to lift the article to be packaged (it should be noted that in this embodiment, the article to be packaged is placed in a tray). On both sides of the discharge port 32 in the box body 1, there are slide rails 3. The slide rails 3 are located above the lifting element 6. An active block 11 is slidably connected in the slide rails 3. A first spring 4 is arranged on one side of the active block 11 in the slide rails 3. A first guide roller 7 is rotatably connected to the active block 11. Both first guide rollers 7 are wound and matched with the unfolded part of the fresh-keeping film 2, so that the fresh-keeping film 2 is horizontally laid above the lifting element 6.

[0034] As Figures 3 - 5 shown, a winding roller 5 is rotatably connected in the box body 1. The outer end of the fresh-keeping film 2 is wound and matched with the winding roller 5; a first motor 28 is installed on the box body 1. The output end of the first motor 28 is coaxially and fixedly connected with the winding roller 5; when the first motor 28 rotates, the winding roller 5 rotates to wind the fresh-keeping film 2 on the winding roller 5.

[0035] As Figure 3 、 Figure 5 and Figure 6 shown, a locking wheel 8 is coaxially and fixedly connected to the first guide roller 7. Two first cylinders 9 are arranged in the box body 1. A stop member 10 is arranged at the free end of the first cylinder 9. The locking wheel 8 is engaged with the stop member 10; a second guide roller 12 is rotatably connected to the active block 11. The second guide roller 12 is located on the side of the first guide roller 7 close to the inner wall of the box body 1. The unfolded part of the fresh-keeping film 2 passes through the gap between the first guide roller 7 and the second guide roller 12; when the locking wheel 8 is engaged with the stop member 10, the first guide roller 7 cannot rotate. Under the action of frictional force, clamping force, etc., the first guide roller 7 and the second guide roller 12 bind the unfolded part of the fresh-keeping film 2, that is, this part of the fresh-keeping film 2 cannot be displaced.

[0036] As Figure 5 and Figure 6As shown, a pressure sensor 13 is installed on the slide rail 3. The sensing portion of the pressure sensor 13 matches the side of the first spring 4 away from the movable block 11. Under the influence of the reaction force, the pressure applied by the first spring 4 to the movable block 11 and the pressure sensor 13 is the same, that is, the pressure sensor 13 can monitor the pressure applied by the first spring 4 to the movable block 11 (equivalent to the resistance of the movable block 11 sliding in the direction close to the pressure sensor 13 in the slide rail 3).

[0037] like Figure 3 As shown in Figure 5, it also includes a third guide roller 14 rotatably connected to the box body 1, and the unfolded part of the plastic wrap 2 is wound around and cooperated with the third guide roller 14. The winding roller 5 and the third guide roller 14 are both located between the two first guide rollers 7; when the item to be packaged rises, it presses against the plastic wrap 2 above. Affected by the distribution position of the plastic wrap 2, the plastic wrap 2 is retracted toward the middle and presses the first guide roller 7. When the pressure is greater than the resistance of the movable block 11 sliding in the slide rail 3, the first spring 4 is compressed, and at the same time, the two first guide rollers 7 approach each other, so that the locking wheel 8 is disengaged from the stopper 10.

[0038] like Figures 1 - 4 As shown, the top of the box body 1 is fixedly connected to a fixed annular plate 15, and the bottom of the fixed annular plate 15 is rotatably connected to a rotating annular plate 16. The fixed annular plate 15 is provided with a plurality of first guide grooves 17 in a circular array with its own axis as the center. The setting direction of the first guide groove 17 is perpendicular to the central axis of the fixed annular plate 15. A plurality of angular sealing plates 18 are provided between the fixed annular plate 15 and the rotating annular plate 16. A first guide block 19 is fixedly connected to one side of the angular sealing plate 18. The first guide groove 17 and the first guide block 19 are slidably matched. The nearly circular space surrounded by multiple angular sealing plates 18 is the discharge port 32, and the angular sealing plates 18 can slide along the first guide groove 17.

[0039] like Figure 4 , Figure 7 and Figure 8 As shown, a second guide groove 20 is provided on the angular sealing plate 18, and a second guide block 21 is slidably connected in the second guide groove 20. A second spring 22 is installed on one side of the second guide block 21 in the second guide groove 20. A plurality of third guide grooves 23 are provided in a circular array with its own axis as the center on the rotating annular plate 16. The bottom end of the second guide block 21 extends to the interior of the third guide groove 23 and slides with the inner wall of the third guide groove 23. The elastic strength of the second spring 22 is relatively high. In the initial state, the angular sealing plate 18 is in a contracted state. When the rotating annular plate 16 rotates forward, the angular sealing plate 18 slides along the first guide groove 17 and the third guide groove 23 at the same time (the second spring 22 will not be compressed at this time), so that the angular sealing plate 18 extends, that is, the discharge port 32 is reduced.

[0040] like Figure 8As shown, an installation groove 24 is formed on one side of the angular sealing plate 18. A cutting knife 25 is slidably arranged in the installation groove 24. An elastic block 26 is installed between the back of the cutting knife 25 and the inner wall of the installation groove 24. A push rod 27 is installed on the second guiding block 21, and the other end of the push rod 27 is matched with the back of the cutting knife 25. When the second guiding block 21 slides in the second guiding groove 20 against the resistance of the second spring 22, the push rod 27 abuts against the back of the cutting knife 25, and the elastic block 26 stretches and stores energy, so that the cutting knife 25 extends out of the installation groove 24 to cut the plastic wrap 2. When the push rod 27 no longer abuts against the cutting knife 25, the elastic block 26 pulls the cutting knife 25 to reset.

[0041] As Figure 2 , Figure 4 and Figure 7 As shown in

[0042] As Figure 2 and Figure 4 shown, an arc-shaped rack 29 is coaxially installed on the rotating annular plate 16, and a second motor 30 is installed on the fixed annular plate 15. The second motor 30 is a forward and reverse motor, and the output end of the second motor 30 is coaxially and fixedly connected with a gear 31. The arc-shaped rack 29 is meshed with the gear 31. With the cooperation of the gear 31 and the arc-shaped rack 29, the second motor 30 can drive the rotating annular plate 16 to rotate forward and backward.

[0043] Working principle of the device: The lifting element 6 is used to lift the article to be packaged and make it abut against the plastic wrap 2 upward. Since the plastic wrap 2 has adhesiveness, the plastic wrap 2 will adhere and cover the article. It should be noted that in the initial state, the locking wheel 8 is engaged with the stopper 10. At this time, the first guiding roller 7 cannot rotate. Under the action of friction, clamping force, etc., the first guiding roller 7 and the second guiding roller 12 will restrain the plastic wrap 2. That is, during the process of the packaged object abutting against the plastic wrap 2 upward, the pressure exerted by the plastic wrap 2 on the article gradually increases to ensure that there is enough pressure to make the plastic wrap 2 adhere to the packaged article.

[0044] As the object moves upward continuously, slowly, and steadily, the contact area between it and the plastic wrap 2 gradually increases, and the degree of extrusion on the plastic wrap 2 also deepens continuously. The plastic wrap 2 will generate a reverse elastic restoring force, which gradually increases as the object rises and then is converted into the pressure applied to the item. As the object continuously pushes upward against the plastic wrap 2, the pressure exerted by the plastic wrap 2 on the item gradually increases. When the pressure reaches a certain level, the sticky substance on the surface of the plastic wrap 2 (such as a special adhesive layer) begins to function and produces an effective bonding effect with the surface of the item. (Sufficient pressure is the key factor to ensure good adhesion of the plastic wrap 2 to the item. A larger pressure can make the plastic wrap 2 closely fit the fine concavities and convexities and textures on the surface of the item, expel the air between the two, reduce the generation of bubbles and wrinkles, and enable the plastic wrap 2 to firmly adhere to the item without falling off or loosening easily, thereby providing reliable sealing and protection for the item and effectively extending the freshness-keeping period and shelf life of the item.)

[0045] It should be noted that the pressure exerted by the plastic wrap 2 on the item to be packaged is proportional to the pressure exerted by the plastic wrap 2 on the first guide roller 7. When the pressure exerted by the plastic wrap 2 on the item reaches the set value, the pressure exerted by the plastic wrap 2 on the first guide roller 7 is greater than the resistance of the movable block 11 sliding in the slide rail 3 (the first spring 4 is compressed), and the two first guide rollers 7 approach each other, causing the locking wheel 8 to disengage from the stopper 10.

[0046] After the locking wheel 8 disengages from the stopper 10, the first guide roller 7 is no longer limited. Under the upward pushing force of the item on the plastic wrap 2, the plastic wrap 2 gathers towards the middle (displaces towards the vicinity of the discharge port 32), that is, the pressure exerted by the plastic wrap 2 on the item will not continue to increase. At the same time, the first guide roller 7 and the second guide roller 12 rotate accordingly. (It should be noted that the first motor 28 is a motor without self-locking function, so it will not limit the displacement of the plastic wrap 2.) When the displacement of the plastic wrap 2 causes the pressure exerted by the plastic wrap 2 on the item to decrease and be less than the set value, the first spring 4 expands to reset the movable block 11, that is, the reset of the movable block 11 causes the locking wheel 8 to re-engage with the stopper 10, and the plastic wrap 2 is restricted again, ensuring that after the item is packaged, the pressure exerted by the plastic wrap 2 on the item is close to the set value.

[0047] It should be noted that this device can adjust the set pressure exerted by the plastic wrap 2 on the item to be packaged according to requirements (such as different materials of the plastic wrap 2, different types and specifications of the items to be packaged).

[0048] When the set pressure needs to be increased, control the free end of the first cylinder block 9 to extend, so that the pressure of the stopper 10 against the locking wheel 8 increases, that is, the compression degree of the first spring 4 increases. At this time, the plastic wrap 2 needs to apply a greater pressure to the first guide roller 7 to make the movable block 11 slide, so that the locking wheel 8 is disengaged from the stopper 10, that is, the set pressure applied by the plastic wrap 2 to the article increases.

[0049] When the set pressure needs to be decreased, control the free end of the first cylinder block 9 to contract, so that the pressure of the stopper 10 against the locking wheel 8 decreases, and the compression degree of the first spring 4 decreases. According to the above principle, the set pressure applied by the plastic wrap 2 to the article decreases.

[0050] Through the setting of the pressure sensor 13, the pressure sensor 13 can monitor the pressure applied by the first spring 4 on the movable block 11, which is convenient for the operator to adjust the resistance of the movable block 11 to slide, that is, it is beneficial to adjust the set pressure applied by the plastic wrap 2 to the article.

[0051] After the article to be packaged abuts against the plastic wrap 2 upward, both of them extend out of the box body 1 through the discharge port 32. Then start the second motor 30, and use the cooperation setting of the gear 31 and the arc rack 29 to make the rotating annular plate 16 rotate forward, and the angled sealing plate 18 slides along the first guide groove 17 and the third guide groove 23 at the same time (at this time the second spring 22 will not be compressed), so that the angled sealing plate 18 extends out, that is, the discharge port 32 shrinks, and multiple angled sealing plates 18 clamp the plastic wrap 2 and make the plastic wrap 2 adhere to the bottom side of the article (here refers to the bottom side of the tray).

[0052] It should be noted that during the extension process of the angled sealing plate 18, the discharge port 32 gradually shrinks, and the amount of the plastic wrap 2 adhering to the bottom side of the tray gradually increases. When the discharge port 32 shrinks to the set value, the amount of the plastic wrap 2 adhering to the bottom side of the tray increases to the set value, and the first guide block 19 moves to contact the limit plate 34, that is, the first guide block 19 is limited. At this time, the angled sealing plate 18 cannot extend any further, and the position of the angled sealing plate 18 is locked. When the rotating annular plate 16 continues to rotate forward, since the second guide block 21 cannot slide in the third guide groove 23 anymore, the inner wall of the third guide groove 23 abuts against the second guide block 21, so that the second guide block 21 overcomes the resistance of the second spring 22 and slides in the second guide groove 20, and the push rod 27 abuts against the back of the cutter 25, so that the cutter 25 extends out of the installation groove 24, thereby cutting off the plastic wrap 2.

[0053] It is worth noting that in the workflow of traditional plastic wrap packaging machines, the normal operating mode is to press the plastic wrap from top to bottom to cover the bottom of the tray. Subsequently, through the coordinated work of the longitudinal sealing mechanism (responsible for longitudinal sealing) and the transverse sealing mechanism (responsible for transverse sealing), the edge of the plastic wrap reserved at the bottom of the tray is precisely clamped to the bottom of the tray to complete the cutting and sealing, so that the plastic wrap is firmly wrapped on the tray. However, this traditional packaging method exposes a significant problem in actual application: a more serious stacking phenomenon will be formed at the intersection of the plastic wrap in the middle of the bottom side of the tray. Specifically, the middle of the bottom side of the tray is significantly higher than the outside due to the multi-layer stacking of plastic wrap, making the bottom of the tray appear uneven with a convex middle and concave around the edges. This uneven bottom structure has a great impact on the stability of the tray. When the packaged items are placed on a display table or other flat surface, they are prone to slipping or tipping due to uneven force on the bottom.

[0054] In the innovative design and application process of this device, improvements are made to the problems of the cling film stacking and poor stability at the bottom of the tray caused by the traditional packaging method. Specifically, unlike the traditional method, the cling film 2 is not continuously pressed to the middle of the bottom side of the tray before being cut off. Instead, the cutter 25 is extended before reaching the middle position to prevent the cling film from being cut off. Figure 9 The cling film 2 is distributed on the bottom side of the tray with a low middle and high outer side, avoiding the bulge in the middle caused by the stacking of multiple layers of cling film 2 in the traditional way. On the contrary, the cling film 2 is moderately stacked and adhered at the edge of the bottom side of the tray to form a stable support structure, which effectively improves the overall stability of the tray.

[0055] It is worth noting that during the operation of this device, the cling film 2 is cut when the discharge port 32 is reduced to a set value. This device can adjust this set value as needed to ensure that this device is suitable for items of different specifications (if the specifications of the items remain unchanged, the distribution amount of the cling film 2 on the bottom side of the tray can also be adjusted as needed); the specific operation is to adjust the position of the limit plate 34 by controlling the extension and contraction of the free end of the second cylinder 33, thereby achieving the adjustment of this set value.

[0056] After the items are packaged, the first motor 28 is started, the winding roller 5 rotates and the cling film 2 is rolled up, and the cling film 2 moves one unit so that a new cling film 2 is laid on the lifting element 6 for the next packaging work.

[0057] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0058] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. The intelligent cutting and sealing component of a fresh-keeping film packaging machine, comprising a box body (1) and a roll-shaped fresh-keeping film (2) rotatably arranged on the box body (1), wherein a lifting element (6) is arranged in the box body (1) and a discharge port (32) is arranged at the top, and it is characterized in that, On both sides of the discharge port (32) inside the box body (1), there are slide rails (3). The slide rails (3) are located above the lifting element (6). An active block (11) is slidably connected inside the slide rails (3). A first spring (4) is arranged on one side of the active block (11) inside the slide rails (3). A first guide roller (7) is rotatably connected to the active block (11). Both of the two first guide rollers (7) are wound and matched with the unfolded part of the plastic wrap (2), so that the plastic wrap (2) is horizontally laid above the lifting element (6); A winding roller (5) is rotatably connected inside the box body (1), and the outer end of the plastic wrap (2) is wound and matched with the winding roller (5). A locking wheel (8) is coaxially and fixedly connected to the first guide roller (7). There are two first cylinders (9) arranged inside the box body (1). A stop member (10) is arranged at the free end of the first cylinder (9). The locking wheel (8) is fitted with the stop member (10).

2. The intelligent cutting and sealing component of the fresh-keeping film packaging machine according to claim 1, characterized in that, A second guide roller (12) is rotatably connected to the active block (11). The second guide roller (12) is located on the side of the first guide roller (7) close to the inner wall of the box body (1). The unfolded part of the plastic wrap (2) passes through the gap between the first guide roller (7) and the second guide roller (12).

3. The intelligent cutting and sealing component of the fresh-keeping film packaging machine according to claim 1, characterized in that, A pressure sensor (13) is installed on the slide rail (3). The sensing part of the pressure sensor (13) is matched with the side of the first spring (4) away from the active block (11).

4. The intelligent cutting and sealing assembly of the fresh-keeping film packaging machine according to claim 1, characterized in that, It further includes a third guide roller (14) rotatably connected inside the box body (1). The unfolded part of the plastic wrap (2) is wound and matched with the third guide roller (14). Both the winding roller (5) and the third guide roller (14) are located between the two first guide rollers (7). A first motor (28) is installed on the box body (1). The output end of the first motor (28) is coaxially and fixedly connected to the winding roller (5).

5. The intelligent cutting and sealing component of the fresh-keeping film packaging machine according to claim 1, wherein A fixed annular plate (15) is fixedly connected to the top of the box body (1). A rotating annular plate (16) is rotatably connected to the bottom of the fixed annular plate (15). A plurality of first guide grooves (17) are circumferentially arranged on the fixed annular plate (15) with its own axis as the center. The arrangement direction of the first guide grooves (17) is perpendicular to the central axis of the fixed annular plate (15). A plurality of angular sealing plates (18) are arranged between the fixed annular plate (15) and the rotating annular plate (16). A first guide block (19) is fixedly connected to one side of the angular sealing plate (18). The first guide groove (17) is slidably matched with the first guide block (19). The nearly circular space surrounded by the plurality of angular sealing plates (18) is the discharge port (32).

6. The intelligent cutting and sealing assembly of the fresh-keeping film packaging machine according to claim 5, characterized in that, A second guiding groove (20) is formed in the angular sealing plate (18). A second guiding block (21) is slidably connected in the second guiding groove (20). A second spring (22) is installed on one side of the second guiding block (21) in the second guiding groove (20). A plurality of third guiding grooves (23) are formed on the rotating annular plate (16) in a circumferential array with the center of the rotating annular plate as the center of the circle. The bottom end of the second guiding block (21) extends into the interior of the third guiding groove (23) and is slidably matched with the inner wall of the third guiding groove (23).

7. The intelligent cutting and sealing component of the fresh-keeping film packaging machine according to claim 6, characterized in that, An installation groove (24) is formed on one side of the angular sealing plate (18). A cutting knife (25) is slidably arranged in the installation groove (24). An elastic block (26) is installed between the back of the cutting knife (25) and the inner wall of the installation groove (24). A push rod (27) is installed on the second guiding block (21). The other end of the push rod (27) is matched with the back of the cutting knife (25).

8. The intelligent cutting and sealing component of the fresh-keeping film packaging machine according to claim 5, characterized in that, An arc-shaped rack (29) is coaxially installed on the rotating annular plate (16). A second motor (30) is installed on the fixed annular plate (15). A gear (31) is coaxially and fixedly connected to the output end of the second motor (30). The arc-shaped rack (29) is meshed with the gear (31).

9. The intelligent cutting and sealing assembly of the fresh-keeping film packaging machine according to claim 5, characterized in that, A second cylinder body (33) is installed on the fixed annular plate (15). A limiting plate (34) is arranged on one side of one of the first guiding blocks (19) close to the discharge port (32). The free end of the second cylinder body (33) is fixedly connected to the limiting plate (34).

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