Stretching metering device for winding plastic product packaging film

Abstract

The utility model relates to the technical field of plastic films, in particular to a stretching metering device for winding a plastic product packaging film, which comprises a fixed and horizontally arranged mounting platform, a bracket fixedly connected to the middle of the top surface of the mounting platform, a supporting plate fixedly connected to the top of the bracket, and three main stretching components arranged at the top of the supporting plate at intervals, wherein one main stretching assembly is fixedly arranged in the middle of the supporting plate in the vertical direction, the other two main stretching assemblies are symmetrically arranged at the corresponding ends of the supporting plate relative to the vertical center line of the supporting plate, and the upper ends of the main stretching assemblies located at the two ends of the supporting plate are obliquely arranged towards the corresponding sides correspondingly. Auxiliary stretching mechanisms are arranged on the left side and the right side of the support respectively, a metering mechanism is arranged at the left end of the installation platform, and a winding mechanism is arranged above the left side of the installation platform. The packaging film stretching device has the beneficial effects that the packaging film is uniformly stretched, so that the stretching quality is improved; and accurate measurement of the winding length of the packaging film is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic films, in particular to a stretching metering device for rolling up plastic product packaging films. Background Art

[0002] Film longitudinal stretching refers to a process of stretching the film produced by the blown film or cast film production line at a certain temperature and stretch ratio. This process can be performed online or offline. Whether it is stretched offline or online during extrusion, it can greatly improve the film's barrier properties, rigidity, flatness, tensile strength and openness. Therefore, this process is widely used in the production and processing of plastic films.

[0003] For example, a stretching metering device for winding up a plastic product packaging film is disclosed in a patent document with a patent publication number of CN213474905U, which includes a stretching roller 1, a stretching roller 2 and a winding roller, a metering mechanism, a cooling mechanism and a controller; the plastic product packaging film is connected to the winding roller from the packaging film horizontal transmission platform through the stretching roller 1 and the stretching roller 2 in sequence; the metering mechanism includes a gear plate with a plurality of teeth evenly distributed along the outer circumferential direction, a light sensor for sensing the changes of teeth and tooth grooves when the gear plate rotates, and a meter for displaying the winding length of the plastic product packaging film, the light sensor has a U-shaped opening with an opening facing the gear plate and the gear plate is clamped therein, the gear plate is arranged at one end of the stretching roller 2 and is coaxially driven with the stretching roller; the rotation direction of the stretching roller 2 is the same as the rotation direction of the packaging film horizontal transmission platform and is opposite to the rotation direction of the stretching roller 1 and the winding roller; the stretching roller 1, the stretching roller 2 and the winding roller are all driven by a motor; the metering mechanism, the cooling mechanism and the motor are all electrically connected to the controller.

[0004] According to the existing technical literature, the device can stretch the packaging film through the stretching roller 1 and the stretching roller 2, and then rewind the packaging film through the rewinding roller. At the same time, the light sensor senses the light changes when the gear plate rotates, so as to measure the length of the rewinding packaging film. However, due to the size of the contact area between the stretching roller 1, the stretching roller 2 and the packaging film, when the two stretch the packaging film, it is easy to make the thickness of the packaging film uneven, thereby reducing the quality of the finished packaging film; secondly, because the gear plate is installed on the stretching roller 2, although the packaging film before entering the stretching roller 2 can be measured, the length of the packaging film will continue to change after being stretched by the stretching roller 2, so the device cannot guarantee the accuracy of the measurement.

[0005] To this end, the utility model optimizes and improves the problems of poor stretching uniformity and low measurement accuracy in the prior art, and hereby proposes a new device that can ensure that the packaging film is evenly stretched and accurately measure its winding length, so as to better solve the problems in the prior art. Utility Model Content

[0006] The utility model is to solve one of the above-mentioned technical problems, and the technical solution adopted is: a stretching metering device for winding up a plastic product packaging film, comprising a fixed and horizontally arranged installation platform, a bracket fixedly connected to the middle of the top surface of the installation platform, a support plate fixedly connected to the top of the bracket, and three main stretching components are arranged at intervals on the top of the support plate, one of the main stretching components is fixedly arranged in the middle position of the support plate along the vertical direction, and the other two main stretching components are symmetrically arranged at the corresponding end positions of the support plate about the vertical center line of the support plate, the upper ends of the main stretching components located at both ends of the support plate are respectively inclined toward the corresponding sides, auxiliary stretching mechanisms are respectively arranged on the left and right sides of the bracket, a metering mechanism is provided at the left end of the installation platform, and a winding mechanism is provided above the left side of the installation platform.

[0007] In any of the above schemes, preferably, the main stretching assembly includes a first cylinder, the lower end of the first cylinder is fixedly connected to the top of the support plate, the upper end of the first cylinder is fixedly connected to a first connecting plate, a plurality of connecting rods are fixedly connected to the top of the first connecting plate at intervals, a first mounting plate is fixedly connected to the upper end of each connecting rod, a first mounting plate is provided at a first mounting groove on the top of the first mounting plate, a plurality of first supporting rollers are provided at intervals along the width direction of the first mounting groove in the internal space of the first mounting groove, each of the first supporting rollers is arranged along the length direction of the first mounting plate, and both ends of the first center rotating shaft of each of the first supporting rollers are respectively movably inserted in the rotating holes at the corresponding positions of the first mounting plate.

[0008] In any of the above schemes, preferably, a second mounting plate is fixedly connected to the left and right sides of the first mounting plate respectively, the two second mounting plates are symmetrically arranged about the axis of the first cylinder, and the outer side portions of the two second mounting plates are inclined toward the inner plate surface of the first mounting plate;

[0009] A second mounting groove is provided at the top of the second mounting plate, and a plurality of second supporting rollers are provided in the inner space of the second mounting groove at intervals along its width direction. Each of the second supporting rollers is arranged along the length direction of the second mounting plate, and both ends of the second center rotating shaft of each of the second supporting rollers are movably inserted into the rotating holes at the corresponding positions of the second mounting plate.

[0010] In any of the above schemes, it is preferred that the auxiliary stretching mechanism includes two slides, and the two slides are respectively arranged at corresponding side positions of the top surface of the mounting platform, and T-shaped slide rails are fixedly connected along the length direction at corresponding positions of the top surface of the mounting platform, and the T-shaped slide grooves at the bottom of each slide are movably connected to the T-shaped slide rails at corresponding positions, and a first rotating shaft is horizontally provided in the space between the two slides, and both ends of the first rotating shaft are respectively movably inserted in the rotating holes of the slides at corresponding positions, and a stretching roller is coaxially fixedly sleeved on the middle section of the first rotating shaft.

[0011] In any of the above schemes, preferably, the inner end of the slide plate is fixedly connected to a second cylinder, the second cylinder is horizontally arranged and the inner end thereof is fixedly connected to a second connecting plate, and the second connecting plate is fixedly connected to a corresponding position on the top of the mounting platform.

[0012] In any of the above schemes, preferably, the metering mechanism includes two third connecting plates, the two third connecting plates are respectively fixedly connected to the corresponding side positions of the left end of the mounting platform, a second rotating shaft is horizontally arranged in the space between the two third connecting plates, two ends of the second rotating shaft are respectively movably inserted in the rotating holes of the third connecting plates at corresponding positions, a metering roller is coaxially fixedly sleeved in the middle of the second rotating shaft, an encoder is fixedly installed on one of the third connecting plates, and the axis of the encoder is coaxially fixedly inserted into the mounting hole at the corresponding end of the second rotating shaft.

[0013] In any of the above schemes, it is preferred that the winding mechanism includes a winding roller, which is coaxially fixedly sleeved on the third rotating shaft, and both ends of the third rotating shaft are movably inserted into the fourth connecting plates at corresponding positions, and the two fourth connecting plates are fixedly arranged.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0015] 1. The utility model supports the packaging film through a plurality of first supporting rollers and a plurality of second supporting rollers, and then drives each of the first supporting rollers and each of the second supporting rollers to move flexibly through the first cylinder, so as to stretch the packaging film. At the same time, through a large range of contact, it can ensure that the packaging film is evenly stretched, thereby improving the stretching quality.

[0016] 2. The utility model uses a stretching roller to abut the packaging film, and then drives the stretching roller to move horizontally through the second cylinder to achieve further stretching of the packaging film. At the same time, it can assist the work of the first cylinder. Through flexible cooperation with the first cylinder, the packaging film can maintain a certain tension regardless of whether the first cylinder is in an extended or retracted state.

[0017] 3. The utility model arranges the metering mechanism between the auxiliary stretching mechanism and the winding mechanism, so that the packaging film can be metered after the stretching is completed, and the winding work can be carried out immediately after the metering is completed, so that the accurate measurement of the winding length of the packaging film can be ensured.

[0018] 4. The utility model drives the metering roller to perform corresponding rotational motion through the horizontal displacement of the packaging film, and at the same time accurately counts the number of rotations of the metering roller through an encoder, thereby measuring the winding length of the packaging film and further improving the accuracy of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the specific implementation of the utility model, the following will briefly introduce the drawings required for the specific implementation. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, each element or component is not necessarily drawn according to the actual scale.

[0020] Figure 1 It is a structural schematic diagram of the stretching metering device of the utility model in the front view direction.

[0021] Figure 2 It is a partial cross-sectional view of the stretching metering device of the utility model in the front view direction.

[0022] Figure 3 It is a partial cross-sectional view of the main stretching component of the utility model in the front view direction.

[0023] Figure 4 It is a schematic structural diagram of the first mounting plate of the utility model when viewed from above.

[0024] Figure 5 It is a partial cross-sectional view of the stretching roller connection structure of the utility model in the side view direction.

[0025] Figure 6 for Figure 5 A partial enlarged view of point A in the middle.

[0026] Figure 7 It is a schematic diagram of the connection structure of the metering roller in the side view of the utility model.

[0027] In the figure, 1. mounting platform; 2. supporting feet; 3. packaging film; 4. bracket; 5. supporting plate; 6. first cylinder; 7. first connecting plate; 8. connecting rod; 9. first mounting plate; 10. first mounting groove; 11. first supporting roller; 12. first central rotating shaft; 13. second mounting plate; 14. second mounting groove; 15. second supporting roller; 16. second central rotating shaft; 17. slide plate; 18. T-type slide rail; 19. T-type slide groove; 20. first rotating shaft; 21. stretching roller; 22. second cylinder; 23. second connecting plate; 24. third connecting plate; 25. second rotating shaft; 26. metering roller; 27. encoder; 28. winding roller; 29. ​​third rotating shaft; 30. fourth connecting plate; 31. mounting frame. DETAILED DESCRIPTION

[0028] The following is a detailed description of the embodiments of the technical solution of the utility model in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the scope of protection of the utility model. Figure 1-Figure 7 as shown in .

[0029] A stretching and metering device for winding up plastic product packaging film comprises a fixed and horizontally arranged installation platform 1, a bracket 4 is fixedly connected to the middle of the top surface of the installation platform 1, a support plate 5 is fixedly connected to the top of the bracket 4, and three main stretching components are arranged at intervals on the top of the support plate 5, one of the main stretching components is fixedly arranged at the middle position of the support plate 5 in the vertical direction, and the other two main stretching components are symmetrically arranged at the corresponding end positions of the support plate 5 about the vertical center line of the support plate 5, the upper ends of the main stretching components located at both ends of the support plate 5 are inclined toward the corresponding sides, auxiliary stretching mechanisms are respectively provided on the left and right sides of the bracket 4, a metering mechanism is provided at the left end of the installation platform 1, and a winding mechanism is provided above the left side of the installation platform 1.

[0030] The bottom of the installation platform 1 is fixed at the corresponding work station through the support legs 2. The upper end of the main stretching assembly can be telescopically moved along its length direction, and the auxiliary stretching mechanism can be moved along the length direction of the installation platform 1.

[0031] In the working state, the head of the packaging film 3 is input from the right side of the installation platform 1, passes through the auxiliary stretching mechanism on the right side, so that the auxiliary stretching mechanism there is pressed against the top of the packaging film 3, and then passes upward over the three main stretching mechanisms, so that the upper ends of the three are respectively pressed against the corresponding positions of the bottom of the packaging film 3, and then continues to pass through the auxiliary stretching mechanism on the left, so that the auxiliary stretching mechanism on the left is pressed against the top of the packaging film 3, and then continues to pass through the metering mechanism, so that the metering mechanism also presses against the top of the packaging film 3, and finally the head of the packaging film 3 is fixedly connected to the winding mechanism.

[0032] By opening the winding mechanism, the packaging film 3 can be stretched evenly at all places with the cooperation of the main stretching component and the auxiliary stretching mechanism, ensuring that the thickness of the packaging film 3 after stretching meets the product requirements. At the same time, with the action of the metering mechanism, the winding length of the packaging film 3 can be accurately measured.

[0033] In any of the above schemes, it is preferred that the main stretching assembly includes a first cylinder 6, the lower end of the first cylinder 6 is fixedly connected to the top of the support plate 5, the upper end of the first cylinder 6 is fixedly connected to a first connecting plate 7, a plurality of connecting rods 8 are fixedly connected at intervals to the top of the first connecting plate 7, a first mounting plate 9 is fixedly connected to the upper end of each of the connecting rods 8, a first mounting plate 9 is provided at a first mounting groove 10 at the top of the first mounting plate 9, a plurality of first supporting rollers 11 are provided at intervals along the width direction of the first mounting groove 10 in the internal space thereof, each of the first supporting rollers 11 is arranged along the length direction of the first mounting plate 9, and both ends of the first center rotating shaft 12 of each of the first supporting rollers 11 are respectively movably inserted into the rotating holes at the corresponding positions of the first mounting plate 9.

[0034] Each first supporting roller 11 can rotate freely around its corresponding first central rotation axis 12. In the working state, the bottom of the packaging film 3 is pressed against the top of the circumferential rolling surface of each first supporting roller 11. In this way, under the telescopic action of the first cylinder 6, each first supporting roller 11 can be translated along the axial direction of the first cylinder 6, thereby allowing the packaging film 3 on each first supporting roller 11 to be stretched.

[0035] In any of the above schemes, preferably, second mounting plates 13 are fixedly connected to the left and right sides of the first mounting plate 9, respectively, and the two second mounting plates 13 are symmetrically arranged about the axis of the first cylinder 6, and the outer side portions of the two second mounting plates 13 are inclined toward the inner plate surface of the first mounting plate 9;

[0036] A second mounting groove 14 is provided at the top of the second mounting plate 13, and a plurality of second supporting rollers 15 are provided in the inner space of the second mounting groove 14 at intervals along its width direction. Each of the second supporting rollers 15 is arranged along the length direction of the second mounting plate 13, and both ends of the second center rotating shaft 16 of each of the second supporting rollers 15 are movably inserted into the rotating holes at the corresponding positions of the second mounting plate 13.

[0037] In order to increase the contact area between the main stretching assembly and the packaging film 3, the second mounting plates 13 are obliquely arranged on the left and right sides of the first mounting plate 9, so that while the first supporting rollers 11 support the packaging film 3, the second supporting rollers 15 can further support the packaging film 3, thereby ensuring that the packaging film 3 can be evenly stretched.

[0038] The two adjacent second mounting plates 13 are arranged on the same plane, so that it can be ensured that each second supporting roller 15 can press and support the packaging film 3 .

[0039] In any of the above schemes, it is preferred that the auxiliary stretching mechanism includes two slides 17, and the two slides 17 are respectively arranged at corresponding side positions on the top surface of the mounting platform 1, and T-shaped slide rails 18 are respectively fixedly connected along the length direction at the corresponding positions on the top surface of the mounting platform 1, and the T-shaped slide grooves 19 at the bottom of each slide 17 are respectively movably connected to the T-shaped slide rails 18 at the corresponding positions, and a first rotating shaft 20 is horizontally provided in the space between the two slides 17, and the two ends of the first rotating shaft 20 are respectively movably inserted in the rotating holes of the slides 17 at the corresponding positions, and a stretching roller 21 is coaxially fixedly sleeved on the middle section of the first rotating shaft 20.

[0040] The packaging film 3 passes through the installation platform 1, the stretching roller 21 and the two slide plates 17, and the top of the packaging film 3 is pressed against the corresponding position of the circumferential roller surface of the stretching roller 21. The slide plate 17 can move horizontally along the T-shaped slide rail 18 through the cooperation and connection between the T-shaped slide rail 18 and the T-shaped slide groove 19, thereby driving the first rotating shaft 20 to move, and further driving the stretching roller 21 to move accordingly. When the stretching roller 21 moves horizontally, the packaging film 3 pressed thereon can be further stretched, thereby assisting the work of the main stretching assembly.

[0041] In any of the above schemes, preferably, the inner end of the slide plate 17 is fixedly connected to a second cylinder 22, the second cylinder 22 is horizontally arranged and the inner end thereof is fixedly connected to a second connecting plate 23, and the second connecting plate 23 is fixedly connected to a corresponding position on the top of the mounting platform 1.

[0042] The second cylinder 22 is arranged along the length direction of the T-shaped slide rail 18, and its inner end is fixedly installed at the corresponding position on the top of the mounting platform 1 through the second connecting plate 23, and its outer end is fixedly connected to the inner end of the slide plate 17. In this way, driven by the second cylinder 22, the slide plate 17 can slide flexibly and automatically along the T-shaped slide rail 18, thereby quickly stretching the packaging film 3.

[0043] In any of the above schemes, it is preferred that the metering mechanism includes two third connecting plates 24, the two third connecting plates 24 are respectively fixedly connected to the corresponding side positions of the left end of the mounting platform 1, and a second rotating shaft 25 is horizontally provided in the space between the two third connecting plates 24, and the two ends of the second rotating shaft 25 are respectively movably inserted into the rotating holes of the third connecting plates 24 at corresponding positions, and a metering roller 26 is coaxially fixedly sleeved in the middle of the second rotating shaft 25, and an encoder 27 is fixedly installed on one of the third connecting plates 24, and the axis of the encoder 27 is coaxially fixedly inserted into the mounting hole at the corresponding end of the second rotating shaft 25.

[0044] The packaging film 3 passes through the installation platform 1, the metering roller 26 and the two third connecting plates 24, and the top of the packaging film 3 is pressed against the bottom of the circumferential roller surface of the metering roller 26. The circumferential roller surface of the metering roller 26 is provided with anti-skid grooves, so that the metering roller 26 can rotate accordingly driven by the displacement of the packaging film 3, and it is ensured that there is no slip between the two. The number of rotations of the second rotating shaft 25 can be accurately calculated by the existing encoder 27, so that the circumference of the circumferential roller surface of the metering roller 26 can be further used to accurately measure the winding length of the stretched packaging film 3 under the calculation of the existing program.

[0045] In any of the above schemes, it is preferred that the winding mechanism includes a winding roller 28, and the winding roller 28 is coaxially fixedly sleeved on the third rotating shaft 29, and the two ends of the third rotating shaft 29 are respectively movably inserted into the fourth connecting plates 30 at corresponding positions, and the two fourth connecting plates 30 are fixedly arranged.

[0046] The third rotating shaft 29 rotates under the drive of the servo motor, thereby further driving the winding roller 28 to rotate accordingly, so as to wind up the stretched packaging film 3.

[0047] Specific working principle:

[0048] First, the material head of the packaging film 3 is input from the right side of the installation platform 1, and passes under the stretching roller 21 on the right side, then passes over the top of each first supporting roller 11 and each second supporting roller 15, and then passes under the stretching roller 21 on the left side, and then passes under the metering roller 26, and finally fixed on the winding roller 28. Then, the servo motor connected to the third rotating shaft 29 is turned on to drive the winding roller 28 to rotate, so as to wind up the packaging film 3. Under the pulling action of the winding roller 28, the packaging film 3 is pressed against the roller body of each rotating roller.

[0049] Afterwards, through the extension and retraction of the first cylinder 6, each first support roller 11 and each second support roller 15 can be synchronously translated along the axial direction of the first cylinder 6, thereby stretching the packaging film 3 pressed against each first support roller 11 and each second support roller 15. At the same time, under the extension and retraction of the second cylinder 22, the two slide plates 17 drive the stretching roller 21 therebetween to move horizontally, thereby further stretching the packaging film 3 pressed against the stretching roller 21, and at the same time assisting the work of each main stretching assembly.

[0050] At the same time, before the packaging film 3 is wound up, it will drive the metering roller 26 to rotate through its horizontal displacement, and further drive the shaft of the encoder 27 to rotate synchronously accordingly, so that the number of rotations of the metering roller 26 can be accurately counted by the encoder 27, so as to accurately measure the winding length of the packaging film 3 after the stretching is completed.

[0051] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

[0052] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A stretching metering device for winding plastic product packaging film, characterized in that: The invention comprises a fixed and horizontally arranged mounting platform (1), a bracket (4) is fixedly connected to the middle of the top surface of the mounting platform (1), a support plate (5) is fixedly connected to the top of the bracket (4), and three main stretching components are arranged at intervals on the top of the support plate (5), one of the main stretching components is fixedly arranged in the middle of the support plate (5) in the vertical direction, and the other two main stretching components are symmetrically arranged at corresponding end positions of the support plate (5) about the vertical center line of the support plate (5), and the upper ends of the main stretching components located at both ends of the support plate (5) are respectively inclined toward the corresponding sides, auxiliary stretching mechanisms are respectively arranged on the left and right sides of the bracket (4), a metering mechanism is provided at the left end of the mounting platform (1), and a winding mechanism is provided above the left side of the mounting platform (1).

2. A stretching metering device for winding plastic product packaging film according to claim 1, characterized in that: The main stretching assembly comprises a first cylinder (6), the lower end of the first cylinder (6) is fixedly connected to the top of the support plate (5), the upper end of the first cylinder (6) is fixedly connected to a first connecting plate (7), a plurality of connecting rods (8) are fixedly connected to the top of the first connecting plate (7) at intervals, a first mounting plate (9) is fixedly connected to the upper end of each connecting rod (8), a first mounting groove (10) is provided at the top of the first mounting plate (9), a plurality of first supporting rollers (11) are arranged at intervals in the internal space of the first mounting groove (10) along the width direction thereof, each of the first supporting rollers (11) is arranged along the length direction of the first mounting plate (9), and the two ends of the first central rotating shaft (12) of each of the first supporting rollers (11) are respectively movably inserted into the rotating holes at the corresponding positions of the first mounting plate (9).

3. A stretching metering device for winding plastic product packaging film according to claim 2, characterized in that: A second mounting plate (13) is fixedly connected to the left and right sides of the first mounting plate (9), respectively, the two second mounting plates (13) are symmetrically arranged about the axis of the first cylinder (6), and the outer side portions of the two second mounting plates (13) are inclined toward the inner plate surface of the first mounting plate (9); A second mounting groove (14) is provided at the top of the second mounting plate (13), and a plurality of second supporting rollers (15) are provided in the internal space of the second mounting groove (14) along its width direction at intervals, and each of the second supporting rollers (15) is arranged along the length direction of the second mounting plate (13), and both ends of the second central rotating shaft (16) of each of the second supporting rollers (15) are movably inserted into rotating holes at corresponding positions of the second mounting plate (13).

4. A stretching metering device for winding plastic product packaging film according to claim 3, characterized in that: The auxiliary stretching mechanism comprises two slide plates (17), the two slide plates (17) are respectively arranged at corresponding side positions of the top surface of the mounting platform (1), T-shaped slide rails (18) are respectively fixedly connected along the length direction at corresponding positions of the top surface of the mounting platform (1), T-shaped slide grooves (19) at the bottom of each slide plate (17) are respectively movably connected to the T-shaped slide rails (18) at the corresponding positions, a first rotating shaft (20) is horizontally arranged in the space between the two slide plates (17), two ends of the first rotating shaft (20) are respectively movably inserted into the rotating holes of the slide plates (17) at the corresponding positions, and a stretching roller (21) is coaxially fixedly sleeved on the middle section of the first rotating shaft (20).

5. A stretching metering device for winding plastic product packaging film according to claim 4, characterized in that: The inner end of the slide plate (17) is fixedly connected to a second cylinder (22), the second cylinder (22) is arranged horizontally and the inner end thereof is fixedly connected to a second connecting plate (23), the second connecting plate (23) being fixedly connected to a corresponding position on the top of the mounting platform (1).

6. A stretching metering device for winding plastic product packaging film according to claim 5, characterized in that: The metering mechanism comprises two third connecting plates (24), the two third connecting plates (24) are respectively fixedly connected to corresponding side positions of the left end of the mounting platform (1), a second rotating shaft (25) is horizontally arranged in the space between the two third connecting plates (24), two ends of the second rotating shaft (25) are respectively movably inserted into rotating holes of the third connecting plates (24) at corresponding positions, a metering roller (26) is coaxially fixedly sleeved in the middle of the second rotating shaft (25), an encoder (27) is fixedly mounted on one of the third connecting plates (24), and the shaft of the encoder (27) is coaxially fixedly inserted into the mounting hole at the corresponding end of the second rotating shaft (25).

7. A stretching metering device for winding plastic product packaging film according to claim 6, characterized in that: The winding mechanism comprises a winding roller (28), the winding roller (28) being coaxially fixedly sleeved on a third rotating shaft (29), the two ends of the third rotating shaft (29) being movably plugged into fourth connecting plates (30) at corresponding positions, and the two fourth connecting plates (30) being fixedly arranged.

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