Mechanism for wrapping and packaging spherical object with preservative film

Abstract

The utility model provides a mechanism for wrapping and packaging a spherical object by using a preservative film, which comprises a rack, a preservative film conveying and cutting mechanism, a mechanical aperture mechanism, a clamping jaw mechanism, a torsion mechanism, a turnover mechanism and a preservative film exhaust mechanism which are arranged on the rack, and a controller for controlling the mechanisms to work, and the photoelectric detection switch is used for sensing the operation action. A preservative film is laid and cut through the preservative film conveying and cutting mechanism, then spherical fruits and vegetables are used for pressing the preservative film into the middle of the mechanical aperture mechanism, and the preservative film is placed on the clamping jaw mechanism. After the photoelectric detection switch detects the putting-in action, the controller controls the clamping jaw mechanism to be closed to grab the spherical fruits and vegetables, then the mechanical aperture mechanism is closed, the preservative film is closed, and the spherical fruits and vegetables are wrapped; the torsion mechanism rotates the clamping jaw mechanism, so that the upper end of the preservative film is rotated and knotted, and meanwhile, the preservative film exhaust mechanism works synchronously and assists in exhausting, so that the effect of laminating and packaging the preservative film is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field related to packaging equipment, in particular to a mechanism for wrapping and packaging spherical objects with a fresh-keeping film. Background Art

[0002] Cling film is a kind of plastic film used for packaging that is very effective in extending the shelf life of food and fresh fruits and vegetables. After packaging, it can isolate the packaged goods from oxygen, prevent water loss, and prevent bacteria from invading, thereby extending the shelf life and maintaining the freshness and original flavor of food and fresh fruits and vegetables. The preservation effect brought by using cling film is much better than other packaging films. However, cling film is too thin and soft, which makes it not effective when heat-sealed in traditional packaging methods. It is easy to have loose heat seals, or holes in the heat-sealed area due to direct melting, or the cling film and the packaged goods are loose after packaging, which affects the packaging quality.

[0003] Fruits and vegetables that are approximately spherical, such as cabbage, cauliflower, purple cabbage, broccoli, pumpkin, etc., are prone to rolling when nakedly packed on traditional plastic wrap packaging machines (a packaging method: direct packaging without adding an additional tray, which improves the appearance of the packaging while greatly saving packaging costs). In addition, the fruits and vegetables do not come into contact with the plastic wrap at the first time, but are transferred on the circulating bracket, which is prone to mutual contamination.

[0004] For the fresh-keeping packaging of fruits and vegetables, the best packaging time is when they are just picked, followed by centralized packaging in cold storage after harvesting. This involves packaging outdoors and has high requirements for packaging speed. Utility Model Content

[0005] The utility model proposes a mechanism for wrapping and packaging spherical objects with plastic wrap, provides a packaging method and a packaging device that can solve these problems, and can quickly wrap spherical fruits and vegetables with plastic wrap, and the packaging is firm and not loose.

[0006] The technical solution of the utility model is implemented as follows: a mechanism for wrapping and packaging spherical objects with cling film, comprising a frame and a cling film conveying and cutting mechanism, a mechanical aperture mechanism, a clamping mechanism, a twisting mechanism, a flipping mechanism and a cling film exhaust mechanism arranged thereon, and also comprising a controller for controlling the operation of the above mechanisms, and a photoelectric detection switch for sensing the operation action;

[0007] The cling film conveying and cutting mechanism is located above the frame and is used for installing, unwinding, pulling, laying and cutting the cling film;

[0008] The mechanical aperture mechanism is an aperture-type opening and closing valve for placing fruits and vegetables, which is located in the middle position below the plastic wrap conveying and cutting mechanism of the frame and is used to collect the plastic wrap after the spherical fruits and vegetables are placed;

[0009] The clamp mechanism is located directly below the center of the mechanical aperture mechanism and is composed of several finger-shaped clamp bodies and components that drive the clamp bodies to open and close.

[0010] The torsion mechanism is a component that rotates the clamp mechanism on a horizontal plane;

[0011] The flipping mechanism flips the torsion mechanism and the clamping mechanism together in a vertical plane;

[0012] The fresh-keeping film exhaust mechanism is used to exhaust the air in the fresh-keeping film while the twisting and turning mechanisms are working.

[0013] Preferably, the mechanical aperture mechanism includes a driving component, a mounting component and a plurality of blades evenly arranged thereon and movable in a horizontal plane, and a small triangle is provided at the end of each blade for limiting and clamping the plastic wrap; the mechanical aperture mechanism is also provided with a zero position detection component for detecting whether the blade is in place, and the zero position detection component includes a zero position switch and a zero position signal plate, the zero position switch is arranged on the mounting component, and the zero position signal plate is arranged at the edge of the blade.

[0014] Preferably, the driving component includes a driving motor and a driving gear installed thereon; the mounting component includes a turntable base and a mechanical aperture bottom plate driven to rotate by the driving gear, and a fixed mechanical aperture top plate; overlapping circular holes are opened in the middle of the mechanical aperture top plate and the mechanical aperture bottom plate, and a plurality of blades are clamped between the mechanical aperture top plate and the mechanical aperture bottom plate, and each blade is driven to rotate synchronously into the circular hole through a slide groove and a slider; the turntable base is a circular ring coaxially arranged and fixedly connected to the mechanical aperture bottom plate, and the outer edge of the circular ring is provided with a gear ring meshing with the driving gear.

[0015] Preferably, the mechanical aperture top plate is fixedly arranged on the frame, and six upper slide grooves are evenly arranged on the plate surface, each upper slide groove is correspondingly arranged with a blade, an upper slider matching with the upper slide groove is arranged on the upper surface of each blade, a lower slider is arranged on the lower surface of the blade, and six lower slide grooves matching with the lower slider are evenly arranged on the mechanical aperture bottom plate;

[0016] The lower slider is a bearing structure. Two bearings form a group of lower sliders and are installed side by side in a lower slide groove. The diameter of the bearing matches the width of the lower slide groove. The rotating shaft at the center of the lower slider is connected to the blade, and the small triangle is integrally formed with the blade.

[0017] Preferably, the cling film conveying and cutting mechanism is located at the top of the frame, and includes a cling film carrying device for mounting the cling film roll, a roller assembly for placing the cling film, a film clamping assembly for unfolding the film, a film clamping drive device for pulling the film clamping assembly, a film guide plate for pulling the cling film up and down, and a film cutting device for cutting the cling film.

[0018] Preferably, the clamping mechanism comprises several evenly distributed clamping bodies, the lower end of which is connected with a swinging ear device for controlling its swinging, a clamping limit plate and a spring limit plate, and an electromagnet lifting plate for pushing up the spring, and the lower part of the electromagnet lifting plate is connected with a clamping driving electromagnet for driving its movement; the two clamping mechanisms are connected by a clamping linkage shaft; each clamping body is also provided with a clamping protective cover to prevent scratching of fruits and vegetables.

[0019] Preferably, the torsion mechanism comprises a torsion drive motor and a transmission gear connected thereto, the clamping mechanism is arranged at the output end of the torsion component, and the transmission gear is connected to drive the clamping mechanism to rotate.

[0020] Preferably, the flipping mechanism comprises a flipping drive motor and a flipping shaft connected thereto, and the output end of the flipping shaft is connected to drive the entire torsion component and the clamping mechanism to flip.

[0021] Preferably, the cling film exhaust mechanism is a set of vacuum exhaust pipes, which are installed above the middle of the mechanical aperture mechanism and are provided with a displacement mechanism for moving them up and down.

[0022] Preferably, the cling film exhaust mechanism is a punching mechanism for puncturing the cling film, the punching mechanism comprising a punching tool and a push-pull electromagnet connected thereto, and a punching position adjustment knob for adjusting the position of the push-pull electromagnet; the telescopic component is a push-pull electromagnet or a cylinder.

[0023] Compared with the prior art, the utility model has the advantages of laying and cutting the cling film through the cling film conveying and cutting mechanism, and then pressing the cling film into the middle of the mechanical aperture mechanism with spherical fruits and vegetables, and placing it on the clamping mechanism. After the photoelectric detection switch detects the insertion action, the controller controls the clamping mechanism to close and grab the spherical fruits and vegetables, and then the mechanical aperture mechanism is closed to close the cling film and wrap the spherical fruits and vegetables; at the same time, the torsion mechanism rotates the clamping mechanism, so that the upper end of the cling film rotates and knots, and while the knot is tied, the cling film exhaust mechanism works synchronously to assist in exhausting, so as to achieve the effect of cling film fitting packaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the overall structural front view of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the cling film conveying and cutting mechanism of the utility model;

[0026] Figure 3 It is a structural schematic diagram of the mechanical aperture mechanism of the utility model;

[0027] Figure 4 It is a top view of the mechanical aperture mechanism of the utility model;

[0028] Figure 5 For the utility model Figure 4 Middle AA section view;

[0029] Figure 6 It is a cross-sectional view of the clamping mechanism and the twisting and flipping mechanism of the utility model;

[0030] Figure 7 It is a schematic diagram of the structure of the clamping mechanism and the twisting and flipping mechanism of the utility model;

[0031] Figure 8 This is a structural schematic diagram of Example 1 of the cling film exhaust mechanism of the utility model;

[0032] Fig. 9 This is a structural schematic diagram of Example 2 of the cling film exhaust mechanism of the utility model;

[0033] Fig.10 It is a structural schematic diagram of Example 3 of the cling film exhaust mechanism of the utility model.

[0034] In the figure: 1. cling film conveying and cutting mechanism; 2. mechanical aperture mechanism; 3. clamping mechanism; 4. twisting mechanism; 5. flipping mechanism; 6. cling film exhaust mechanism; 8. frame; 9. photoelectric detection switch;

[0035] 11. Roller assembly; 12. First film clamping assembly; 13. Second film clamping assembly; 14. Film clamping driving device; 15. Film cutting device; 16. Film guide plate; 17. Synchronous motor; 18. Synchronous belt; 19. Support rod;

[0036] 21. Driving motor; 22. Driving gear; 23. Turntable base; 24. Mechanical aperture top plate; 241. Upper slide; 25. Mechanical aperture bottom plate; 251. Lower slide; 26. Blade; 261. Small triangle; 262. Lower slide; 263. Upper slide; 28. Zero position signal board; 29. ​​Zero position switch;

[0037] 31. Clamp body; 32. Swing ear device; 321. Compression spring; 33. Clamp limit plate; 34. Spring limit plate; 35. Electromagnetic lifting plate; 36. Electromagnet; 38. Reset spring; 39. Mounting plate;

[0038] 41. Torsion motor; 42. Transmission gear;

[0039] 51. Flip motor; 52. Flip shaft;

[0040] 61. Punching tool; 62. Push-pull electromagnet; 63. Adjustment knob; 64. Upper connecting plate; 65. Lower connecting plate; 66. Punching motor; 67. Vacuum exhaust pipe. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Example: See Figure 1, a mechanism for wrapping spherical objects with cling film, comprising a frame and a cling film conveying and cutting mechanism 1, a mechanical aperture mechanism 2, a clamping mechanism 3, a twisting mechanism 4, a flipping mechanism 5 and a cling film exhaust mechanism 6 arranged thereon, and also comprising a controller for controlling the operation of the above mechanisms, and a photoelectric detection switch 9 for sensing the operation action; the cling film is laid and cut by the cling film conveying and cutting mechanism 1, and then the cling film is pressed into the middle of the mechanical aperture mechanism 2 with spherical fruits and vegetables, and placed on the clamping mechanism 3. After the photoelectric detection switch 9 detects the insertion action, the controller controls the clamping mechanism 3 to close and grab the spherical fruits and vegetables, and then the mechanical aperture mechanism 2 is closed, the cling film is closed and the spherical fruits and vegetables are wrapped; at the same time, the twisting mechanism 4 rotates the clamping mechanism 3, so that the upper end of the cling film rotates and is knotted, and the cling film exhaust mechanism 6 works synchronously while the knot is tied to assist in exhausting, so as to achieve the effect of cling film fitting packaging.

[0045] After the spherical package is put in, it will directly contact the plastic wrap immediately and will not directly contact other parts of the packaging device. When the package is automatically wrapped with plastic wrap, it does not adopt the traditional method of lifting and then wrapping the package with plastic wrap by cross-movement of the push plate. Instead, the package is placed in the unfolded plastic wrap from above, and the package drives the plastic wrap to press downward into the clamping mechanism 3. After the clamping mechanism 3 is closed, the mechanical aperture device gathers and clamps the plastic wrap on the top of the package, and then the torsion mechanism 4 where the clamping mechanism 3 is located drives the clamping mechanism 3 to make multiple turns of rotation, so that the plastic wrap is continuously twisted and completely fits the package; then the mechanical aperture mechanism 2 is opened, and the torsion mechanism 4 is turned 180 degrees as a whole, and the clamping mechanism 3 is opened, and the packaged package falls downward into the container below due to the influence of gravity.

[0046] When a spherical fruit or vegetable is packed, the flip motor 51 of the flip mechanism 5 works to flip the two clamping mechanisms 3, and then releases the clamping body 31 to release the spherical fruit or vegetable into the container below, thus completing the overall packaging work.

[0047] like Figure 2As shown, the cling film conveying and cutting mechanism 1 is located above the frame, that is, the top of the entire packaging machine, and is used for installing, unwinding, pulling, laying and cutting the cling film; the cling film conveying and cutting mechanism 1 is located at the top of the frame, and includes a cling film carrying device for installing the cling film roll, a roller assembly 11 for laying the cling film, a film clamping assembly for unfolding the film, a film clamping driving device 14 for pulling the film clamping assembly, a film guide plate 16 for pulling the cling film up and down, and a film cutting device 15 for cutting the cling film; the roller assembly 11 includes a film laying roller, a transition roller, A one-way damping roller and a damping adjuster, wherein the film clamping assembly includes a first film clamping assembly 12 and a second film clamping assembly 13 which are arranged in parallel, and both film clamping assemblies include two parallel long strip mounting seats, as well as a magnetic clamping member and a reset elastic member between the two; the film clamping drive device 14 includes a synchronous motor 17 and two sets of synchronous belts 18 driven by the synchronous motor 17 and connected to both ends of the film clamping assembly, as well as support rods 19 which support the first film clamping assembly 12 and the second film clamping assembly 13, and the two support rods 19 are adjacent to and parallel to the two sets of synchronous belts 18, respectively.

[0048] The cling film conveying and cutting mechanism 1 is used for installing, unwinding, pulling, laying and cutting the cling film. The roller assembly 11 fixes the cling film on the frame and unwinds the cling film by adjusting the tension through each roller; the first film clamping assembly 12 and the second film clamping assembly 13 clamp the cling film at the head and tail ends of the cling film segment respectively to pull the cling film; the film clamping drive device 14 is an electromagnetic clamping component, which can clamp the cling film and have tension at the front and back to keep it flat; the film cutting device 15 is located at the outlet end of the roller assembly 11, and cooperates with the film guide plate 16 and the film clamping drive device 14 to cut the cling film.

[0049] This mechanism is a prior art for which a patent has been applied for, see: film loading mechanism CN210913085U, and a film packaging device and a film packaging method CN111422396A, which will not be described in detail here.

[0050] like Figure 3 , Figure 4 , Figure 5 As shown, the mechanical aperture mechanism 2 includes a driving component, a mounting component and a plurality of blades 26 evenly arranged thereon and movable in a horizontal plane. A small triangle 261 is provided at the end of each blade 26 for limiting and clamping the plastic wrap. The mechanical aperture mechanism 2 is also provided with a zero position detection component for detecting the position of the blade 26. The zero position detection component includes a zero position switch 29 and a zero position signal plate 28. The zero position switch 29 is arranged on the mounting component, and the zero position signal plate 28 is arranged at the edge of the blade 26.

[0051] The optical mechanical aperture mechanism has the same principle as the camera aperture structure, and both of them rotate and drive the slider to move the blades 26, and finally realize the combination of each blade 26 to close, block and open the circular hole. In the present application, a protruding small triangle 261 is added to the end of each blade 26, and the small triangle 261 can prevent the blades 26 of the mechanical aperture mechanism 2 from rushing over when closing, and play a limiting role; after the cling film is loaded, the sharp corners of the side of the small triangle 261 are all facing inward to support the clamped cling film after the cling film is folded, so that the folded cling film is less likely to be displaced when twisted.

[0052] The mechanical aperture base plate 25 is connected to the turntable base 23. The turntable base 23 can rotate freely under the action of the driving motor 21 and the driving gear 22. When the mechanical aperture base plate 25 rotates under the drive of the driving gear 22, each blade 26 will be synchronously retracted or opened until the slider reaches the limit position of the slide slot. The retracted or opened position can be controlled by controlling the number of rotations of the driving motor 21. When the slider reaches the limit position of the slide slot, the zero position signal plate 28 on the blade 26 just contacts the zero position switch 29 set on the mechanical aperture base plate 25, thereby triggering the zero position switch 29. The zero position switch 29 transmits a signal to the controller, thereby realizing further action of the mechanical aperture mechanism 2.

[0053] The driving component includes a driving motor 21 and a driving gear 22 installed thereon; the mounting component includes a turntable base 23 and a mechanical aperture bottom plate 25 driven to rotate by the driving gear 22, and a fixed mechanical aperture top plate 24; overlapping circular holes are opened in the middle of the mechanical aperture top plate 24 and the mechanical aperture bottom plate 25, and a plurality of blades 26 are clamped between the mechanical aperture top plate 24 and the mechanical aperture bottom plate 25, and each blade 26 is driven to rotate synchronously into the circular hole through a slide groove and a slider; the turntable base 23 is a circular ring coaxially arranged and fixedly connected to the mechanical aperture bottom plate 25, and the outer edge of the circular ring is provided with a gear ring meshing with the driving gear 22.

[0054] The mechanical aperture top plate 24 is fixedly arranged on the frame, and six upper slide grooves 241 are evenly arranged on the plate surface, each upper slide groove 241 is correspondingly arranged with a blade 26, and an upper slider 263 matching with the upper slide groove 241 is arranged on the upper surface of each blade 26, and a lower slider 262 is arranged on the lower surface of the blade 26, and six lower slide grooves 251 matching with the lower slider 262 are evenly arranged on the mechanical aperture bottom plate 25;

[0055] The lower slider 262 is a bearing structure. Two bearings form a group of lower sliders 262 and are installed side by side in a lower groove 251. The diameter of the bearing matches the width of the lower groove 251. The rotating shaft at the center of the lower slider 262 is connected to the blade 26. The small triangle 261 is integrally formed with the blade 26. The upper slider 263 and the lower slider 262 both adopt a bearing structure, so that rolling friction is generated between the bearing and the upper groove 241 and the lower groove 251, which reduces resistance and makes sliding smoother.

[0056] like Figure 6 , Figure 7 As shown, the clamp mechanism 3 includes several evenly distributed clamp bodies 31, the lower end of which is connected with a fixed seat, a mounting plate 39, a swing ear device 32, a clamp limit plate 33 and a spring limit plate 34, and an electromagnetic lifting plate 35 for pushing up the spring, and an electromagnet 36 for driving the electromagnetic lifting plate 35 is connected below. The lower end of the clamp body 31 is mounted on the swing ear device 32, and the swing ear device 32 is mounted on the mounting plate 39 through a fixed seat and a compression spring 321. The spring limit plate 34 is fixedly connected to the mounting plate 39; the edge of the mounting plate 39 is meshed with the transmission gear 42. The clamp limit plate 33 is fixedly connected to the electromagnetic lifting plate 35 through several connecting shafts and moves up and down synchronously. A reset spring 38 is sleeved on each connecting shaft, and a passage hole for the reset spring 38 to pass through is opened on the mounting plate 39. The spring limiting plate 34 is provided with a hole only for the connecting shaft to pass through, and the hole diameter is smaller than the diameter of the return spring 38 , so the return spring 38 is limited.

[0057] Each clamp body 31 is also provided with a clamp protection cover; the clamp protection cover is made of flexible material, which can not only prevent metal parts from scratching fruits and vegetables, but also increase the friction between the clamp body 31 and the plastic wrap and fruits and vegetables, so that the fruits and vegetables are not easily offset when they are twisted quickly.

[0058] The upper side of the reset spring 38 is a spring limit plate 34 with a fixed position, and the lower side is an electromagnetic lifting plate 35 that can move up and down. When in a stationary state, the electromagnet is not energized, and the electromagnetic lifting plate 35 is not acted upon by the electromagnet, but is acted upon by the reset spring 38, so it is in a downward position. The clamping jaw limit plate 33 fixedly connected thereto is also in a downwardly pressed position. The lower edge of the clamping jaw limit plate 33 limits the swing ear device 32, but the compression spring 321 on the swing ear device 32 supports it, so that the swing ear device 32 fits with the clamping jaw limit plate 33; the pressure of the compression spring 321 is less than the pressure of the reset spring 38, and it can only support the swing ear device 32, but cannot push the clamping jaw limit plate 33. Therefore, the clamping jaw body 31 is in a closed state under the action of the reset spring 38, the spring limit plate 34, the electromagnetic lifting plate 35, the clamping jaw limit plate 33 and the swing ear device 32;

[0059] The clamp mechanism 3 is arranged directly below the central circular hole of the mechanical aperture mechanism 2. After the operator puts the spherical fruits and vegetables into the mechanical aperture mechanism 2, the fruits and vegetables will press the cling film into the clamp body 31 due to gravity. The photoelectric detection switch 9 is triggered during the process of pressing the cling film. After the photoelectric detection switch 9 detects the insertion action, the signal is sent to the controller. The controller controls the electromagnet 36 to be energized. The electromagnet 36 works to push the spring limit plate 34 upward through the push rod. The tension of the reset spring 38 is less than the thrust of the electromagnet 36 and is compressed. The clamp limit plate 33 moves upward with the electromagnetic lifting plate 35. During the movement, the pressure of the edge of the clamp limit plate 33 on the swing ear device 32 decreases. The compression spring 321 below the swing ear device 32 close to one side of the clamp limit plate 33 continues to push it upward. Under the lever action of the fixed seat, the position of the clamp body 31 on the other side of the swing ear device 32 drops, and the entire clamp mechanism 3 opens, so that fruits and vegetables can be put in.

[0060] When the photoelectric detection switch 9 detects the fruits and vegetables to be put into the package, the electromagnet 36 is energized, the reset spring 38 is compressed, and the clamping mechanism 3 is opened. After the placement is completed, the electromagnet 36 is de-energized, and the clamping mechanism 3 clamps the packaged fruits and vegetables under the action of the reset spring 38. In the clamping state, the electromagnet 36 does not need to work, which effectively avoids the serious heating and shortened service life caused by the electromagnet 36 being in the working state for a long time.

[0061] The twisting mechanism 4 includes a twisting drive motor 41 and a transmission gear 42 connected thereto. The clamping mechanism 3 is arranged at the output end of the twisting mechanism 4. The transmission gear 42 is connected to drive the clamping mechanism 3 to rotate on a horizontal plane. The flipping mechanism 5 includes a flipping drive motor 51 and a flipping shaft 52 connected thereto. The output end of the flipping shaft 52 is connected to drive the entire twisting mechanism 4 and the clamping mechanism 3 to flip in a vertical plane.

[0062] The mounting plate 39 of the clamping jaw mechanism 3 is circular and has a transmission tooth on its edge that meshes with the transmission gear 42. The clamping jaw limiting plate 33, the electromagnet lifting plate 35 and the clamping jaw body 31 are all arranged on the mounting plate. The torsion motor 41 arranged on the side of the clamping jaw mechanism 3 drives the mounting plate to rotate horizontally through the transmission gear 42, thereby driving the clamping jaw body 31 to rotate so that the cling film is tightened.

[0063] When the clamp body 31 is located at the top and has finished wrapping the spherical fruits and vegetables with the cling film, the flip drive motor 21 works to rotate the flip shaft 44 connected to it, and the position of the clamp body 31 on the clamp mechanism 3 is flipped, and the clamp body 31 that clamps the spherical fruits and vegetables rotates to the bottom. After the electromagnet 36 is powered off, the clamp body 31 opens, and the spherical fruits and vegetables after the film is released fall into the container located below, completing a packaging work. Then the flip mechanism 5 flips again, so that the clamp body 31 flips to the top again, aligns with the central circular hole of the mechanical aperture mechanism 2, and waits for the next film coating work.

[0064] When the plastic wrap is twisted, a closed space will be formed, and the remaining space will become smaller as the number of twists increases. If the gas in the plastic wrap is not discharged in advance or cannot be discharged when twisting, the air pressure inside the plastic wrap will increase as the remaining space becomes smaller. When it is higher than the external atmospheric pressure, bulging or rupture will occur after packaging is completed.

[0065] The cling film exhaust mechanism 6 in the present application is used to exhaust the air in the cling film while the twisting mechanism 4 is working; after the cling film is tightened, due to the viscosity of the cling film itself, the tightening head of the cling film can easily fit on the surface of the packaging without loosening. At this time, it can be directly packed or framed for transportation, and a heating device such as a heating plate or a hot air blower can be used to heat the tightening head or heat it in the air to achieve a more beautiful and firmer purpose.

[0066] Example 1, see Figure 8 The cling film exhaust mechanism 6 is a set of vacuum exhaust pipes 67, which are installed above the middle of the mechanical aperture mechanism 2 and are provided with a displacement mechanism for moving it up and down.

[0067] After the package is put in, the mouth of a vacuum exhaust pipe 67 is moved to the top of the package, and the mouth of the pipe is extended to a position lower than the blade 26 of the mechanical aperture mechanism 2. Then the mechanical aperture mechanism 2 clamps the vacuum exhaust pipe 67 when closing. At this time, there is a plastic wrap between the mechanical aperture blade 26 and the vacuum exhaust pipe 67, which can play a certain sealing role. The outer ring of the vacuum exhaust pipe 67 at the clamped position can be installed or coated with a soft and wear-resistant plastic layer to facilitate the sealing during clamping. After the vacuum exhaust pipe 67 is clamped, the vacuum system is started, and the air between the plastic wrap and the package is quickly extracted through the vacuum exhaust pipe 67. After the set vacuum degree requirement is reached, the mechanical aperture mechanism 2 opens a part of the distance, and the vacuum exhaust pipe 67 is then quickly withdrawn upward. After the vacuum exhaust pipe 67 is withdrawn, the blade 26 of the mechanical aperture mechanism 2 is quickly closed to the end point, and then the twisting mechanism is started to complete the subsequent packaging action. It should be noted that when the vacuum exhaust pipe 67 starts to be evacuated, it continues to evacuate until the mechanical aperture mechanism 2 is completely closed, so that a relatively low air pressure is always maintained between the packaged object and the cling film.

[0068] This implementation scheme will not damage the cling film, and the cling film has good sealing performance after packaging, and the preservation effect is better; after packaging, the cling film and the packaged object fit more closely, and the appearance effect is better; the fit between the cling film and the packaged object can be adjusted by adjusting the time of vacuum extraction, and different vacuum extraction times can be set for different packages to achieve the best appearance effect; when no vacuum is extracted, the effect of inflatable packaging can be achieved.

[0069] Example 2, see Fig. 9 The cling film exhaust mechanism 6 is a punching mechanism for puncturing the cling film. The punching mechanism is arranged above the middle of the mechanical aperture mechanism 2. The punching mechanism includes a punching tool 61 and a push-pull electromagnet 62 connected thereto, and a punching position adjustment knob 63 for adjusting the position of the push-pull electromagnet 62. When the clamp mechanism 3 holds the fruits and vegetables for rotation, the punching motor 66 drives the push-pull electromagnet 62 to push the punching tool 61 downward to punch holes in the cling film, so that the air squeezed in the cling film during the rotation process is quickly discharged, and the punching tool 61 is quickly retracted before the blades 26 of the mechanical aperture mechanism 2 are closed.

[0070] Example 3, see Fig.10 The cling film exhaust mechanism 6 is a punching mechanism for puncturing the cling film. The punching mechanism is arranged below the mechanical aperture mechanism 2, and includes a punching tool 61, an upper connecting plate 64, a lower connecting plate 65 and a punching motor 66. The punching motor 66 is connected to drive the upper connecting plate 64 and the lower connecting plate 65. The upper connecting plate 64 and the lower connecting plate 65 are each connected to drive a punching tool 61, and the two punching tools 61 are respectively located on both sides below the circular hole of the aperture mechanism 2. When the twisting and flipping mechanism 4 drives the clamping mechanism 3 to clamp the coated fruits and vegetables to rotate, the two sides of the cling film are quickly punched, so that the air in the cling film is discharged through the small holes.

[0071] The cling film exhaust mechanism 6 works before the cling film is twisted, wherein vacuum exhaust is to reduce the air pressure inside the cling film, so that when the cling film is twisted to the minimum space, the air pressure inside the cling film is still slightly lower than the external atmospheric pressure, so as to achieve the effect of close fitting packaging. Perforated exhaust is to punch small holes at appropriate positions of the cling film, so that when the cling film is twisted, as the air pressure inside the cling film increases, the gas is discharged through the small holes, and finally the air pressure inside the cling film is consistent with the external atmospheric pressure.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mechanism for wrapping and packaging a spherical object with a plastic wrap, characterized in that: It includes a frame and a cling film conveying and cutting mechanism, a mechanical aperture mechanism, a clamping mechanism, a twisting mechanism, a flipping mechanism and a cling film exhaust mechanism arranged thereon, and also includes a controller for controlling the operation of the above mechanisms, and a photoelectric detection switch for sensing the operation action; The cling film conveying and cutting mechanism is located above the frame and is used for installing, unwinding, pulling, laying and cutting the cling film; The mechanical aperture mechanism is an aperture-type opening and closing valve for placing fruits and vegetables, which is located in the middle position below the plastic wrap conveying and cutting mechanism of the frame and is used to collect the plastic wrap after the spherical fruits and vegetables are placed; The clamp mechanism is located directly below the center of the mechanical aperture mechanism and is composed of several finger-shaped clamp bodies and components that drive the clamp bodies to open and close. The torsion mechanism is a component that rotates the clamp mechanism on a horizontal plane; The flipping mechanism flips the torsion mechanism and the clamping mechanism together in a vertical plane; The fresh-keeping film exhaust mechanism is used to exhaust the air in the fresh-keeping film while the twisting and turning mechanisms are working.

2. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 1, characterized in that: The mechanical aperture mechanism includes a driving component, a mounting component and a plurality of blades evenly arranged thereon and movable in a horizontal plane. A small triangle is provided at the end of each blade for limiting and clamping the plastic wrap. The mechanical aperture mechanism is also provided with a zero position detection component for detecting whether the blades are in place. The zero position detection component includes a zero position switch and a zero position signal plate. The zero position switch is arranged on the mounting component, and the zero position signal plate is arranged at the edge of the blade.

3. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 2, characterized in that: The driving component includes a driving motor and a driving gear installed thereon; the mounting component includes a turntable base and a mechanical aperture bottom plate driven to rotate by the driving gear, and a fixed mechanical aperture top plate; overlapping circular holes are opened in the middle of the mechanical aperture top plate and the mechanical aperture bottom plate, and a plurality of blades are clamped between the mechanical aperture top plate and the mechanical aperture bottom plate, and each blade is driven to rotate synchronously into the circular hole through a slide groove and a slider; the turntable base is a circular ring coaxially arranged and fixedly connected to the mechanical aperture bottom plate, and the outer edge of the circular ring is provided with a gear ring meshing with the driving gear.

4. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 3, characterized in that: The mechanical aperture top plate is fixedly arranged on the frame, and six upper slide grooves are evenly arranged on the plate surface, each upper slide groove is corresponding to a blade, an upper slider matching the upper slide groove is arranged on the upper surface of each blade, a lower slider is arranged on the lower surface of the blade, and six lower slide grooves matching the lower sliders are evenly arranged on the mechanical aperture bottom plate; The lower slider is a bearing structure. Two bearings form a group of lower sliders and are installed side by side in a lower slide groove. The diameter of the bearing matches the width of the lower slide groove. The rotating shaft at the center of the lower slider is connected to the blade, and the small triangle is integrally formed with the blade.

5. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 1, characterized in that: The cling film conveying and cutting mechanism is located at the top of the frame, and includes a cling film carrying device for mounting the cling film roll, a roller assembly for placing the cling film, a film clamping assembly for unfolding the film, a film clamping driving device for pulling the film clamping assembly, a film guide plate for pulling the cling film up and down, and a film cutting device for cutting the cling film.

6. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 1, characterized in that: The clamping mechanism includes several evenly distributed clamping bodies, the lower ends of which are connected with a fixed seat, a mounting plate, a swing ear device, a clamping limit plate and a spring limit plate, as well as an electromagnetic lifting plate for pushing up the spring, and an electromagnet for driving the electromagnetic lifting plate to move is connected below; the two clamping mechanisms are connected by a clamping linkage shaft, the lower ends of the clamping bodies are mounted on the swing ear device, and the swing ear device is mounted on the mounting plate through a fixed seat and a compression spring, and the spring limit plate is fixedly connected to the mounting plate; the edge of the mounting plate is meshed with the transmission gear.

7. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 6, characterized in that: The clamping jaw limit plate and the electromagnetic lifting plate are fixedly connected through several connecting shafts and move up and down synchronously. A reset spring is sleeved on each connecting shaft, and a passage hole for the reset spring to pass through is opened on the mounting plate; a hole is opened on the spring limit plate for only the connecting shaft to pass through, and the hole diameter is smaller than the diameter of the reset spring, so the reset spring is limited.

8. The mechanism for wrapping and packaging a spherical object with a plastic wrap according to claim 1, characterized in that: The torsion mechanism includes a torsion drive motor and a transmission gear connected thereto; the clamp mechanism is arranged at the output end of the torsion component, and the transmission gear is connected to drive the clamp mechanism to rotate; the flipping mechanism includes a flipping drive motor and a flipping shaft connected thereto; the output end of the flipping shaft is connected to drive the entire torsion component and the clamp mechanism to flip.

9. A mechanism for wrapping and packaging a spherical object with a plastic wrap according to any one of claims 1 to 8, characterized in that: The cling film exhaust mechanism is a set of vacuum exhaust pipes, which are installed above the middle of the mechanical aperture mechanism and are provided with a displacement mechanism for moving the vacuum exhaust pipes up and down.

10. A mechanism for wrapping and packaging a spherical object with a plastic wrap according to any one of claims 1 to 8, characterized in that: The cling film exhaust mechanism is a punching mechanism for puncturing the cling film, and the punching mechanism includes a punching tool and a telescopic component connected thereto, and a punching position adjustment knob for adjusting the position of the push-pull component, and the telescopic component is a push-pull electromagnet or a cylinder.

Images