Packaging machine suitable for cold stretching film bag and film sleeving method of packaging machine

Abstract

The invention relates to the technical field of packaging equipment, and discloses a packaging machine suitable for a cold stretching film bag and a film sleeving method.The packaging machine suitable for the cold stretching film bag comprises a main machine frame, a lifting mechanism, a stretching mechanism and a conveying mechanism, a film rolling mechanism, a feeding mechanism and a bag making mechanism of a conventional automatic film sleeving machine are omitted. And the film stretching hand is inverted, and the sealing end of the film is positioned at the lower part by adopting a reverse film bag rolling mode, so that the film bag can be reversely sleeved into goods conveniently. Due to the design of reverse sleeving of the film bag, an operator can manually position the film bag to the stretching manipulator, the height of the conveying mechanism is effectively reduced, the total height of the whole equipment is synchronously reduced, the space needed by equipment installation and operation is saved, and the adaptability and flexibility of the equipment are improved; in addition, pneumatic elements are completely omitted, the use requirements of customers are reduced, the maintenance cost of equipment is reduced, and the reliability and stability of the equipment are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging equipment, and in particular relates to a packaging machine suitable for cold-stretched film bags and a film covering method thereof. Background Art

[0002] In the field of cold stretch hood packaging machines, most of the equipment currently used is highly automated. As an important packaging material, cold stretch hood film is usually provided in the form of film rolls and is widely used in the packaging process of various products. Its production process involves multiple steps, including film bag making, winding into the robot, expanding and stretching, and releasing the film to completely cover the goods.

[0003] However, although automation technology has been widely used in cold stretch hood packaging machines, the equipment under the existing technology still has some significant disadvantages, especially the high cost problem. Specifically, due to the large number of processes involved in cold stretch hood packaging machines, the required transmission mechanism, motor and control system are relatively complex. The transmission mechanism needs to ensure the smooth transmission of the film during bag making, winding, stretching and other processes, and the motor needs to provide sufficient power and precision to control the movement of each mechanism. At the same time, the control system also needs to have a high level of intelligence and automation to achieve precise coordination and synchronization between the various processes.

[0004] These complex technical requirements lead to high manufacturing costs for cold stretch hood packaging machines. For many customers with lower packaging cycle requirements, high equipment costs have become a major obstacle for them to adopt this advanced packaging technology. This not only limits their advantages in market competition, but may also affect product packaging quality and customer experience. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems and to provide a packaging machine suitable for cold-stretch film bags and a film covering method thereof. By directly using the finished cold-stretch film bags, only the necessary film covering process is retained, and manual semi-automatic operation is adopted, the equipment cost is greatly reduced without reducing the protective effect of the cargo packaging, and the customer's usage threshold is lowered.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a packaging machine suitable for cold-stretched film bags, comprising a main frame, wherein the main frame is configured as a gantry structure, a lifting mechanism is slidably provided on the top of the main frame, a stretching mechanism is slidably provided on the main frame, and a conveying mechanism is provided on the bottom of the inner side of the main frame; The stretching mechanism comprises a frame, a movable stretching arm and a stretching manipulator. Four movable stretching arms are provided, and the four movable stretching arms are respectively located at the four corners of the frame. The four movable stretching arms are all provided with a stretching manipulator.

[0007] A further improvement of the present invention is that the lifting mechanism includes a driving shaft, a driven shaft, a driving motor and a transmission chain, the driving motor is located in the middle of the top of the main frame, one end of the driving shaft is connected to both sides of the driving motor, the other end of the driving shaft is connected to the driven shaft through a transmission chain, and the driven shaft is located at the bottom of the main frame.

[0008] A further improvement of the present invention is that the stretching mechanism further includes a reeling and unreeling device, and four reeling and unreeling devices are provided, and the four reeling and unreeling devices are respectively arranged below the four stretching manipulators.

[0009] A further improvement of the present invention is that the four stretching manipulators are respectively provided with a tightening pin positioning position; and the four winding and unwinding devices are respectively provided with a clamp and a rubber-coated wheel.

[0010] A further improvement of the present invention is that a set of roller guide devices is respectively provided on the left and right sides of the frame.

[0011] A further improvement of the present invention is that the conveying mechanism is fixedly arranged on the ground, and the projection dimension of the width of the conveying mechanism on the ground is smaller than the projection dimension of the width of the goods on the ground.

[0012] In a second aspect, the present invention further provides a film covering method for a packaging machine suitable for a cold stretch film bag, comprising the following steps: S1, the operator inputs a command to lower the stretching mechanism to the manual bagging height, and at the same time the four movable stretching arms retract to the bagging position; S2, the operator enters the stretching mechanism and fixes the cold stretch film bag on the stretching manipulator; S3, the operator leaves the stretching mechanism, inputs a command to make the stretching mechanism rise to the height of the goods, and stretches the cold stretch film bag; S4, the operator puts the goods into the conveying mechanism, inputs instructions, and conveys the goods to the film covering position at the center of the main frame; S5, the operator continues to input instructions to lower the stretching mechanism and put the stretched cold stretch film bag on the goods; S6, the stretching mechanism 3 rises back to the starting position, and the conveying mechanism conveys the goods after the film is wrapped, completing a packaging cycle.

[0013] A further improvement of the present invention is that in S2, the operator opens the clamps on the four winding and unwinding devices in turn, puts the marked position of the cold-stretched film bag into the tightening pin positioning position at the bottom of the stretching robot, straightens the film and immediately pulls the clamp to make the rubber-coated wheel of the winding and unwinding device press the nylon wheel on the top of the stretching robot.

[0014] A further improvement of the present invention is that in S3, the reeling and unreeling device rotates to reel the cold-stretched film bag onto the stretching robot, and at the same time, the four movable stretching arms are synchronously expanded to complete the stretching operation of the cold-stretched film bag.

[0015] A further improvement of the present invention is that in S5, when the stretching mechanism descends, the reeling and unreeling device releases the film bag so that the cold-stretched film bag covers the goods, and the cold-stretched film bag is tightly attached to the goods through the driving action of the stretching manipulator.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a packaging machine suitable for cold-stretched film bags, which directly uses finished cold-stretched film bags and eliminates the film roll, feeding and bag-making mechanisms of conventional automatic film-wrapping machines. The film stretching arm is inverted, and the film bag is rolled up in reverse, so that the film sealing end is located at the bottom, which is convenient for reversely wrapping the film bag into the goods. The reverse-wrapping design of the film bag is conducive to the operator manually positioning the film bag on the stretching manipulator, and effectively reduces the height of the conveying mechanism, so that the total height of the entire equipment is synchronously reduced, which not only saves the space required for equipment installation and operation, but also improves the adaptability and flexibility of the equipment; in addition, the pneumatic components are completely eliminated, which reduces the customer's use requirements, reduces the maintenance cost of the equipment, and improves the reliability and stability of the equipment.

[0017] Furthermore, four winding and unwinding devices are respectively arranged under four stretching manipulators, and the winding and unwinding devices and the stretching manipulators work closely together to ensure a high degree of synchronization in the winding and unwinding process of the cold stretch film bag, thereby improving the operating efficiency and flexibility of the cold stretch film bag packaging machine.

[0018] Furthermore, the four stretching manipulators are respectively provided with a tightening pin positioning position. Through the precise positioning of the tightening pin, the marking position of the cold-stretched film bag can be firmly fixed, thereby ensuring the stability and accuracy of the subsequent stretching and film covering operations. This design not only improves the packaging efficiency, enabling the manipulator to quickly and accurately complete the stretching and film covering of the film bag, but also greatly enhances the accuracy and consistency of the packaging, ensuring the perfect presentation of the product packaging.

[0019] Furthermore, the four rewinding and unwinding devices are respectively equipped with clamps and rubber-coated wheels, which can firmly fix the cold-stretched film bags on the stretching manipulator, ensure the stability of the film bags during high-speed operation, and avoid packaging errors caused by shaking or falling off. At the same time, the pressing effect of the rubber-coated wheels not only realizes the smooth rewinding and unwinding operation of the film bags, but also ensures the smooth and precise positioning of the film bags during the transmission process through its excellent wear resistance and anti-skid performance.

[0020] Furthermore, a set of roller guide devices are provided on the left and right sides of the frame, ensuring that the stretching mechanism can move up and down smoothly and accurately along the two columns of the main frame, effectively improving the stability and reliability of the mechanical operation. The roller guide device not only reduces the friction and resistance during the movement, making the lifting action smoother and more efficient, but also ensures the accurate positioning of the stretching mechanism in the vertical direction through its precise guiding function, avoiding packaging errors that may be caused by offset or shaking.

[0021] Furthermore, the conveying mechanism is fixed on the ground, and the projection dimension of the width of the conveying mechanism on the ground is smaller than the projection dimension of the width of the goods on the ground, ensuring that the film can be put on the bottom of the goods.

[0022] The present invention also provides a film covering method for a packaging machine suitable for cold-stretched film bags, in which an operator covers the finished film bag on a stretching robot of a movable stretching arm, issues a command to stretch the film, and then conveys the goods to be packaged, continues to issue commands, covers the film bag on the goods in reverse, and completes the film covering of the goods; by pre-fixing the film bag on the stretching robot and quickly stretching and covering it when needed, the packaging cycle is greatly shortened and time efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are only schematic, used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the lifting mechanism in the present invention; Figure 3 It is a structural schematic diagram of the stretching mechanism in the present invention.

[0025] Among them: 1. Main frame; 2. Lifting mechanism; 21. Active shaft; 22. Driven shaft; 23. Driving motor; 24. Transmission chain; 3. Stretching mechanism; 31. Frame; 32. Active stretching arm; 33. Stretching manipulator; 34. Rewinding and unwinding device; 4. Conveying mechanism. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 connection 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.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings: like Figure 1 As shown, an embodiment of the present invention provides a packaging machine suitable for cold-stretch film bags, including a main frame 1, a lifting mechanism 2, a stretching mechanism 3 and a conveying mechanism 4; wherein in order to make the structure stable and have a strong bearing capacity, the main frame 1 is configured as a gantry structure with two columns, which simplifies the structure and ensures sufficient strength and rigidity.

[0033] In this embodiment, a lifting mechanism 2 is slidably arranged on the top of the main frame 1, and a stretching mechanism 3 is slidably arranged on the main frame 1. The lifting mechanism 2 drives the stretching mechanism 3 to perform up and down lifting movements through a sprocket chain mechanism. This driving method can ensure that the lifting mechanism 2 can still be lifted and lowered smoothly and quickly when bearing a large load, thereby meeting the performance requirements of the packaging machine.

[0034] In this embodiment, a conveying mechanism 4 is fixedly arranged on the ground inside the main frame 1, and the projection size of the width of the conveying mechanism 4 on the ground is smaller than the projection size of the width of the goods on the ground, so that the conveying mechanism 4 can fully avoid the goods and ensure that the film is smoothly put into the bottom of the goods.

[0035] In this embodiment, Figure 2 As shown, the lifting mechanism 2 includes a driving shaft 21, a driven shaft 22, a driving motor 23 and a transmission chain 24. The driving motor 23 is located in the middle of the top of the main frame 1. One end of the driving shaft 21 is connected to both sides of the driving motor 23. The other end of the driving shaft 21 is connected to the driven shaft 22 through the transmission chain 24. The driven shaft 22 is located at the bottom of the main frame 1.

[0036] In this embodiment, Figure 3 As shown, the stretching mechanism 3 includes a frame 31, an active stretching arm 32, a stretching robot 33 and a winding and unwinding device 34. Four active stretching arms 32 are provided, and the four active stretching arms 32 are respectively located at the four corners of the frame 31. The four active stretching arms 32 can make reciprocating movements of extending and retracting on the frame 31. Four winding and unwinding devices 34 are provided, and the four winding and unwinding devices 34 are respectively arranged under the four stretching robots 33. The four active stretching arms 32, the four stretching robots 33 and the four winding and unwinding devices 34 cooperate to wind and unwind the cold-stretched film bag. The four active stretching arms 32 synchronously make extending and retracting movements, and the four stretching robots 33 drive the cold-stretched film bag to expand and shrink.

[0037] In this embodiment, a set of roller guide devices is respectively provided on the left and right sides of the frame 31 , so that the frame 31 can move up and down on the two columns of the main frame 1 .

[0038] In this embodiment, the four stretching manipulators 33 are respectively provided with a tightening pin positioning position to ensure that the stretching manipulators 33 can be accurately aligned with the target position during operation, thereby reducing positioning errors.

[0039] In this embodiment, the four winding and unwinding devices 34 are respectively provided with clamps and rubber-coated wheels; the clamps can firmly clamp the cold-stretched film bags to ensure that the cold-stretched film bags will not slide or fall off during the winding and unwinding process, thereby improving the accuracy and stability of the winding and unwinding; the surface of the rubber-coated wheels is covered with rubber, and the rubber surface has certain anti-slip properties, which can ensure that the cold-stretched film bags remain stable during the winding and unwinding process, prevent the cold-stretched film bags from falling off or being damaged due to sliding, and improve the quality and efficiency of the winding and unwinding.

[0040] The embodiment of the present invention further provides a film covering method for a packaging machine suitable for a cold stretch film bag, comprising the following steps: Step S1, the operator inputs a command to lower the stretching mechanism 3 to the manual bagging height, and at the same time, the four movable stretching arms 32 retract to the bagging position; Step S2, the operator enters the stretching mechanism 3, opens the clamps on the four reeling and unreeling devices 34 in turn, puts the marked position of the cold-stretched film bag into the positioning position of the top tightening pin at the bottom of the stretching manipulator 33, straightens the film, and immediately pulls the clamp to make the rubber-wrapped wheel of the reeling and unreeling device 34 press the nylon wheel at the top of the stretching manipulator 33, and fixes the cold-stretched film bag on the stretching manipulator 33; Step S3, the operator leaves the stretching mechanism 3 and inputs a command to make the stretching mechanism 3 rise to the height of the goods, and the reeling and unreeling device 34 rotates to reel the cold-stretched film bag onto the stretching manipulator 33, and at the same time, the four movable stretching arms 32 are synchronously expanded to complete the stretching operation of the cold-stretched film bag; Step S4, the operator puts the goods into the conveying mechanism 4, inputs instructions, and conveys the goods to the film covering position at the center of the main frame 1; Step S5, the operator continues to input instructions to lower the stretching mechanism 3, and the reeling and unreeling device 34 releases the film bag so that the cold-stretched film bag covers the goods, and the cold-stretched film bag is put on the goods through the driving action of the stretching manipulator 33; Step S6, the stretching mechanism 3 rises back to the starting position, and the conveying mechanism 4 conveys the goods after the film is wrapped, completing a packaging cycle.

[0041] How it works The packaging machine for cold-stretched film bags of the present invention comprises a main frame 1, a lifting mechanism 2, a stretching mechanism 3 and a conveying mechanism 4. The lifting mechanism 2 and the stretching mechanism 3 are slidably arranged on the main frame 1, and the lifting mechanism 2 drives the stretching mechanism 3 to move up and down through a sprocket chain mechanism to ensure that it can still be lifted and lowered smoothly and quickly when bearing a large load; the stretching mechanism 3 comprises a frame 31, a movable stretching arm 32, a stretching manipulator 33 and a winding and unwinding device 34, and the stretching and film covering operation of the cold-stretched film bag is realized through the extension and retraction of the movable stretching arm 32 and the driving action of the stretching manipulator 33; the conveying mechanism 4 is arranged on the ground inside the main frame 1, and is used to transport the goods to the bottom of the stretching mechanism 3, so as to ensure the stability and accuracy of the goods during the film covering process.

[0042] During the film covering process, the active stretching arm 32 first retracts to the bag covering position, and the operator fixes the cold-stretched film bag on the stretching manipulator 33. Then the stretching mechanism 3 is raised to the height of the goods, and the reeling device 34 rotates to reel the film bag onto the stretching manipulator 33, while the active stretching arm 32 is synchronously expanded to complete the stretching operation of the cold-stretched film bag. Finally, the goods are transported to the film covering position in the center of the main frame 1 through the conveying mechanism 4. When the stretching mechanism 3 descends and covers the goods, the film bag can be tightly covered on the goods.

[0043] In summary, the working principle of this packaging machine is to realize the automatic packaging of cold stretch film bags through the coordinated work of the lifting mechanism, stretching mechanism and transmission mechanism. During the whole process, the operator only needs to input simple instructions to complete the film covering and packaging operations of the goods, which greatly improves the packaging efficiency and accuracy. At the same time, the packaging machine has a stable structural design and is easy to operate, which is suitable for packaging needs of various sizes.

[0044] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

[0045] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. A packaging machine suitable for cold stretch film bags, characterized in that: The main frame (1) comprises a main frame (1), wherein the main frame (1) is configured as a gantry structure, a lifting mechanism (2) is slidably provided on the top of the main frame (1), a stretching mechanism (3) is slidably provided on the main frame (1), and a conveying mechanism (4) is provided on the bottom of the inner side of the main frame (1); The stretching mechanism (3) comprises a frame (31), a movable stretching arm (32) and a stretching manipulator (33), wherein four movable stretching arms (32) are provided, and the four movable stretching arms (32) are respectively located at four corners of the frame (31), and the four movable stretching arms (32) are each provided with a stretching manipulator (33).

2. A packaging machine suitable for cold stretch film bags according to claim 1, characterized in that: The lifting mechanism (2) comprises a driving shaft (21), a driven shaft (22), a driving motor (23) and a transmission chain (24); the driving motor (23) is located in the middle of the top of the main frame (1); both sides of the driving motor (23) are connected to one end of the driving shaft (21); the other end of the driving shaft (21) is connected to the driven shaft (22) via the transmission chain (24); and the driven shaft (22) is located at the bottom of the main frame (1).

3. A packaging machine suitable for cold stretch film bags according to claim 1, characterized in that: The stretching mechanism (3) further comprises a reeling and unreeling device (34), four of which are provided, and the four reeling and unreeling devices (34) are respectively provided below the four stretching manipulators (33).

4. A packaging machine suitable for cold stretch film bags according to claim 1 or 3, characterized in that: The four stretching manipulators (33) are respectively provided with a tightening pin positioning position; and the four reeling and unreeling devices (34) are respectively provided with a clamp and a rubber-coated wheel.

5. A packaging machine suitable for cold stretch film bags according to claim 1, characterized in that: A set of roller guide devices is respectively arranged on the left and right sides of the frame (31).

6. A packaging machine suitable for cold stretch film bags according to claim 1, characterized in that: The conveying mechanism (4) is fixedly arranged on the ground, and the projection dimension of the width of the conveying mechanism (4) on the ground is smaller than the projection dimension of the width of the goods on the ground.

7. A method for cold stretch film bag covering using the packaging machine according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, the operator inputs a command to lower the stretching mechanism (3) to a manual bagging height, and at the same time the four movable stretching arms (32) retract to a bagging position; S2, the operator enters the stretching mechanism (3) and fixes the cold-stretched film bag on the stretching manipulator (33); S3, the operator leaves the stretching mechanism (3), inputs a command, causes the stretching mechanism (3) to rise to the height of the goods, and stretches the cold stretch film bag; S4, the operator places the goods into the conveying mechanism (4), inputs instructions, and conveys the goods to the film covering position at the center of the main frame (1); S5, the operator continues to input instructions to make the stretching mechanism (3) descend, and put the stretched cold stretch film bag on the goods; S6, the stretching mechanism 3 rises back to the starting position, and the conveying mechanism (4) conveys the goods after the film is wrapped, completing a packaging cycle.

8. A film covering method for a packaging machine suitable for cold stretch film bags according to claim 7, characterized in that: In S2, the operator opens the clamps on the four winding and unwinding devices (34) in turn, places the marked position of the cold-stretched film bag into the positioning position of the tightening pin at the bottom of the stretching manipulator (33), straightens the film and immediately pulls the clamp so that the rubber-coated wheel of the winding and unwinding device (34) presses the nylon wheel on the top of the stretching manipulator (33).

9. The method for covering a packaging machine for a cold stretch film bag according to claim 7, characterized in that: In S3, the reeling and unreeling device (34) rotates to reel the cold-stretched film bag onto the stretching robot (33), and at the same time, the four movable stretching arms (32) expand synchronously to complete the stretching operation on the cold-stretched film bag.

10. The method for covering a packaging machine for a cold stretch film bag according to claim 7, characterized in that: In S5, when the stretching mechanism (3) descends, the reeling and unreeling device (34) releases the film bag so that the cold-stretched film bag covers the goods, and the cold-stretched film bag is tightly attached to the goods through the driving action of the stretching manipulator (33).

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