A kind of PE film material unwinding mechanical tensioning equipment for roll industry

Abstract

The utility model relates to a coiled material unwinding technical field provides a kind of PE film material unrolling mechanical tensioning equipment for coiled material industry, it includes pivot body, first extrusion component, second extrusion component and drive adjusting mechanism, first extrusion component is movably connected in pivot body along the one end of its own axis, the side of first extrusion component towards film material paper tube is equipped with first conical abutment portion, and first conical abutment portion gradually increases and is arranged in the direction away from film material paper tube;Second extrusion component is movably connected in pivot body along the other end of its own axis, the side of second extrusion component towards film material paper tube is equipped with second conical abutment portion, and second conical abutment portion gradually increases and is arranged in the direction away from film material paper tube;Drive adjusting mechanism is connected with first extrusion component and second extrusion component respectively, and drives both synchronous movement towards or away from each other, to resist or loosen the film material paper tube between two extrusion components.Equipment applicability is improved by realizing the stable tensioning of adaptation small inner diameter paper tube.

Description

Technical Field

[0001] This utility model relates to the field of roll unwinding technology, and in particular to a mechanical tensioning device for PE film unwinding in the roll material industry. Background Technology

[0002] In the roll material production and processing process, PE film is one of the commonly used materials. When roll material production requires the use of PE film, the film unwinding equipment is the core equipment for realizing continuous unwinding, tension control, and subsequent processing (such as printing, lamination, slitting, etc.). Its operational stability directly determines the processing accuracy, product yield, and production efficiency of the roll material.

[0003] However, in actual production, special situations often arise where PE film rolls with small inner diameter paper tubes (less than 10mm smaller than the normal size) need to be handled. These small-diameter paper tube PE film rolls may occur due to differences in production batches, specific customer requirements, or variations in raw materials. When using traditional film spreading equipment, these small-diameter paper tube PE film rolls often cannot be effectively secured. Due to the dimensional mismatch between the inner diameter of the paper tube and the equipment's fixing device, the PE film roll may loosen, slip, or even detach during the spreading process. This not only affects the quality and efficiency of spreading the film but may also damage the PE film, increasing production costs and scrap rates. Utility Model Content

[0004] This utility model provides a tensioning device for PE film spreading machinery in the roll material industry, which solves the defect of poor adaptability of existing PE film spreading equipment for small inner diameter paper tubes, achieves stable tensioning for small inner diameter paper tubes, and improves the applicability of the equipment.

[0005] This utility model provides a mechanical tensioning device for PE film spreading in the roll film industry, including... The rotating shaft body can be movably inserted into the membrane material paper tube; The first extrusion assembly is movably connected to one end of the rotating shaft body along its own axis and movably abuts against the film material paper tube. The first extrusion assembly has a first conical abutment part on the side facing the film material paper tube, and the first conical abutment part is arranged to gradually increase in size away from the film material paper tube. The second extrusion assembly is movably connected to the other end of the rotating shaft body along its own axis and movably abuts against the film material tube. The second extrusion assembly has a second conical abutment part on the side facing the film material tube, and the second conical abutment part is arranged to gradually increase in size away from the film material tube. A drive adjustment mechanism is connected to the first extrusion assembly and the second extrusion assembly respectively, and drives the two to move synchronously towards or away from each other, so as to press against or loosen the film paper tube between the first extrusion assembly and the second extrusion assembly.

[0006] According to the present invention, a tensioning device for PE film spreading machinery in the roll material industry is provided, wherein the taper of the first conical abutment part or the second conical abutment part is 8°~12°.

[0007] According to the present invention, a tensioning device for PE film spreading in the roll film industry is provided, wherein the outer wall surfaces of the first conical abutment part and the second conical abutment part are covered with a rubber layer.

[0008] According to the present invention, a mechanical tensioning device for PE film spreading in the roll material industry is provided. The outer circumferential surface of the rotating shaft body near both ends is provided with external thread sections. The two external thread sections are opposite threads to each other. The first extrusion component and the second extrusion component are respectively threadedly connected through the corresponding external thread sections.

[0009] According to the present invention, a tensioning device for PE film spreading machinery in the roll material industry is provided. The first extrusion assembly includes a first pair of pressure sleeves and a first clamping nut. The first pair of pressure sleeves is provided with a first conical abutment portion on the side facing the film paper tube. The first clamping nut is connected to the side of the first pair of pressure sleeves away from the first conical abutment portion. The first clamping nut is threadedly connected to the external thread section.

[0010] According to the present invention, a tensioning device for PE film spreading machinery in the roll material industry is provided. The second extrusion assembly includes a second pair of pressure sleeves and a second clamping nut. The second pair of pressure sleeves is provided with a second conical abutment part on the side facing the film paper tube. The second clamping nut is connected to the side of the second pair of pressure sleeves away from the second conical abutment part. The second extrusion assembly and the rotating shaft body are threadedly connected by the second clamping nut and the corresponding external thread section.

[0011] According to the present invention, a mechanical tensioning device for PE film spreading in the roll material industry is provided. The driving adjustment mechanism includes a handwheel and a gearbox. One end of the rotating shaft body is provided with a transmission gear. The handwheel is fixedly connected to the input shaft of the gearbox. The output gear of the gearbox meshes with the transmission gear, so that the handwheel drives the rotating shaft body to rotate through the meshing of the gearbox and the transmission gear.

[0012] According to the present invention, a mechanical tensioning device for PE film spreading in the roll material industry is provided. The drive adjustment mechanism includes a drive motor and a gearbox. One end of the rotating shaft body is provided with a transmission gear. The drive motor is connected to the input shaft of the gearbox. The output gear of the gearbox meshes with the transmission gear, so that the drive motor drives the rotating shaft body to rotate through the meshing of the gearbox and the transmission gear.

[0013] According to the present invention, a mechanical tensioning device for PE film spreading in the roll material industry further includes two shaft end blocks. The two shaft end blocks are axially spaced along the rotating shaft body and correspond one-to-one with the first extrusion component and the second extrusion component, respectively. The shaft end block corresponding to the first extrusion component is located on its side closer to the second extrusion component, and the shaft end block corresponding to the second extrusion component is located on its side closer to the first extrusion component. The shaft end blocks are used to limit the maximum stroke of each component when the first extrusion component and the second extrusion component move toward each other.

[0014] According to the present invention, a mechanical tensioning device for PE film spreading in the roll material industry is provided. Two main keyways are provided on the optical shaft end located between the two external threaded sections on the rotating shaft body. The two main keyways correspond one-to-one with the first extrusion component and the second extrusion component. Sub-keyways are provided at corresponding positions on the inner walls of the first extrusion component and the second extrusion component. When the first extrusion component and the second extrusion component move to a preset position, locking keys are embedded in the main keyways and the sub-keyways to lock the axial position of the first extrusion component and the second extrusion component on the rotating shaft body.

[0015] This utility model provides a tensioning device for PE film spreading machinery in the roll film industry. The first and second extrusion components are movably connected to both ends of the rotating shaft body, and each has a tapered abutment portion that gradually increases in size towards the film tube. This design allows the two tapered abutments to gradually penetrate deeper into the inner cavity of the film tube when the drive adjustment mechanism drives the first and second extrusion components to move synchronously towards each other. As they approach each other, a uniform and gradually increasing extrusion force is generated on the inner wall of the tube, thus achieving stable tensioning. Even for small-diameter tubes, this tapered abutment structure can adapt well to their inner wall shape. By adjusting the distance between the two extrusion components, the tensioning degree can be precisely controlled, ensuring stable tensioning for small-diameter tubes of different sizes. Therefore, this solution achieves stable tensioning for small-diameter tubes, improving the applicability of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1This is a structural schematic diagram of a mechanical tensioning device for PE film spreading in the roll film industry, provided by this utility model.

[0018] Figure label: 10. Tensioning equipment for PE film spreading machinery in the roll film industry; 100. Shaft body; 110. External thread section; 200. First extrusion assembly; 210. First pressure sleeve; 211. First tapered abutment part; 220. First clamping nut; 300. Second extrusion assembly; 310. Second pressure sleeve; 311. Second tapered abutment part; 320. Second clamping nut; 400. Transmission gear; 500. Wear-resistant sleeve. Detailed Implementation

[0019] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0020] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0024] The following is combined Figure 1 This paper provides a detailed description of a mechanical tensioning device for PE film spreading in the roll film industry, through specific embodiments and application scenarios.

[0025] In the embodiments of this utility model, such as Figure 1 As shown, a PE film spreading and tensioning device 10 for the roll film industry includes a rotating shaft body 100, a first extrusion assembly 200, a second extrusion assembly 300, and a drive adjustment mechanism. The rotating shaft body 100 is movably inserted into the film tube. The first extrusion assembly 200 is movably connected to one end of the rotating shaft body 100 along its own axis and movably abuts against the film tube. The first extrusion assembly 200 has a first conical abutment portion 211 on the side facing the film tube, and the first conical abutment portion 211 gradually increases in size away from the film tube. The second extrusion assembly 300 is movably connected to the other end of the rotating shaft body 100 along its own axis and movably abuts against the film paper tube. The second extrusion assembly 300 is provided with a second conical abutment part 311 on the side facing the film paper tube. The second conical abutment part 311 is arranged to gradually increase in size away from the film paper tube. The drive adjustment mechanism is connected to the first extrusion assembly 200 and the second extrusion assembly 300 respectively, and drives the two to move synchronously towards or away from each other, so as to press or loosen the film paper tube between the first extrusion assembly 200 and the second extrusion assembly 300.

[0026] The rotating shaft body 100, serving as the supporting component of the entire tensioning device, provides a basic positioning for subsequent tensioning operations due to its movable insertion within the film material tube. The rotating shaft body 100 defines the installation position of the device within the paper tube, allowing the first extrusion assembly 200 and the second extrusion assembly 300 to move relative to each other within the paper tube, using the rotating shaft body 100 as a reference, thereby achieving the tensioning function. Simultaneously, the movable insertion design facilitates the installation and disassembly of the device. When the film material tube needs to be replaced, the rotating shaft body 100 can be easily pulled out or inserted into the paper tube, improving operational convenience.

[0027] Both ends of the rotating shaft body 100 are detachably connected to the support frame of the film spreading machine via wear-resistant sleeves 500.

[0028] In one embodiment, the shaft body 100 is a solid shaft with a diameter of D-20mm (20mm smaller than the normal size) to ensure that it can easily pass through the paper tube with the smallest inner diameter (even if the inner diameter is ≤D-10mm, there is still a gap of ≥10mm to facilitate insertion).

[0029] The rotating shaft body 100 is made of No. 45 steel (quenched and tempered) to ensure rigidity (bending resistance) and to meet the tension requirements when the membrane material is unfolded.

[0030] The length of the rotating shaft body 100 is matched with the width of the membrane material, such as 1m-3m, and adjusted according to the actual roll material specifications.

[0031] The first extrusion assembly 200 is movably connected to one end of the rotating shaft body 100 along its own axis. This movable connection allows the first extrusion assembly 200 to move along the axis of the rotating shaft body 100. By moving along the axis, the first extrusion assembly 200 can change the distance between itself and the film paper tube, thereby achieving the pressing or releasing of the paper tube.

[0032] The first extrusion assembly 200 is in movable contact with the film material paper tube, allowing for flexible contact and separation between the two components as needed. During the tensioning process, the first extrusion assembly 200 is in close contact with the paper tube, transmitting extrusion force to achieve tension; when it is necessary to loosen the paper tube, it can be separated in a timely manner, avoiding unnecessary damage to the paper tube and facilitating the operation and maintenance of the equipment.

[0033] The first extrusion assembly 200 has a first conical abutment portion 211 on the side facing the film material paper tube. The first conical abutment portion 211 is gradually increased in size away from the film material paper tube. When the first extrusion assembly 200 moves towards the film material paper tube, the small end of the conical abutment portion first enters the inner cavity of the paper tube. As the movement goes deeper, the contact area between the conical surface and the inner wall of the paper tube gradually increases. This gradually increasing contact area allows the extrusion pressure to be evenly distributed on the inner wall of the paper tube, avoiding the problem of excessive local stress leading to deformation or damage of the paper tube. At the same time, the conical structure can better adapt to paper tubes with different inner diameters. For paper tubes with small inner diameters, the conical abutment portion can penetrate deep into them, providing sufficient friction and support to achieve a stable tensioning effect.

[0034] The second extrusion assembly 300 is movably connected to the other end of the rotating shaft body 100 along its own axis. Similar to the first extrusion assembly 200, the second extrusion assembly 300 is movably connected to the other end of the rotating shaft body 100, allowing it to move freely in the axial direction of the rotating shaft body 100. This symmetrical layout design allows the two extrusion assemblies to move synchronously and jointly perform tensioning operations on the film paper tube, ensuring uniform force on the paper tube in the circumferential direction and improving the stability and reliability of the tensioning.

[0035] The second extrusion assembly 300 movably abuts against the film paper tube. This movable contact ensures flexible contact and separation between the two. During tensioning and loosening, the contact state with the paper tube can be adjusted promptly according to operational needs, protecting the paper tube from damage and facilitating equipment operation.

[0036] The second extrusion assembly 300 has a second conical abutment portion 311 on the side facing the film tube. The second conical abutment portion 311 gradually increases in size away from the film tube, and its function is the same as that of the first conical abutment portion 211. It cooperates with the first conical abutment portion 211. When the two extrusion assemblies move synchronously towards each other, the two conical abutments simultaneously penetrate into the inner cavity of the film tube, squeezing the tube from both ends. This symmetrical conical extrusion structure enables the paper tube to be subjected to uniform extrusion force in the circumferential direction, further enhancing the stability of tensioning. It is especially suitable for tensioning small inner diameter paper tubes and can effectively prevent the paper tube from loosening or slipping during film spreading.

[0037] The drive adjustment mechanism is connected to the first extrusion assembly 200 and the second extrusion assembly 300 respectively, and drives them to move synchronously towards or away from each other to tighten or loosen the film material tube between the first extrusion assembly 200 and the second extrusion assembly 300. By connecting the drive adjustment mechanism to the first extrusion assembly 200 and the second extrusion assembly 300, the movement direction and speed of the two extrusion assemblies can be precisely controlled. When it is necessary to tighten the film material tube, the drive adjustment mechanism drives the two extrusion assemblies to move synchronously towards each other, causing the conical abutment part to gradually penetrate into the inner cavity of the paper tube, achieving tightening and tensioning of the paper tube; when it is necessary to loosen the paper tube, the drive adjustment mechanism drives the two extrusion assemblies to move synchronously away from each other, causing the conical abutment part to separate from the paper tube, facilitating the replacement of the film material tube. This ensures that the paper tube is subjected to uniform force during tightening and loosening, avoiding paper tube deformation or damage caused by asynchronous movement of the two extrusion assemblies, and improving the operational stability and reliability of the equipment. Meanwhile, the drive adjustment mechanism can flexibly adjust the tension according to different film material paper tube specifications and film spreading requirements, further improving the applicability of the equipment.

[0038] This application uses a first extrusion assembly 200 and a second extrusion assembly 300, respectively movably connected to both ends of the rotating shaft body 100. Both assemblies have tapered abutment portions that gradually increase in size towards the film paper tube. When the drive adjustment mechanism drives the first extrusion assembly 200 and the second extrusion assembly 300 to move synchronously towards each other, the two tapered abutment portions gradually penetrate into the inner cavity of the film paper tube. As they approach each other, a uniform and gradually increasing extrusion force is generated on the inner wall of the paper tube, thereby achieving stable tensioning. Even for paper tubes with small inner diameters, this tapered abutment structure can adapt well to their inner wall shape. By adjusting the distance between the two extrusion assemblies, the degree of tension can be precisely controlled, ensuring stable tensioning for small inner diameter paper tubes of different sizes. Therefore, this solution achieves stable tensioning for small inner diameter paper tubes, improving the applicability of the equipment.

[0039] Reference Figure 1 According to the present invention, a tensioning device 10 for PE film spreading machinery in the roll material industry is provided, wherein the taper of the first conical abutment part 211 or the second conical abutment part 311 is 8°~12°.

[0040] Understandably, a taper range of 8° to 12° can achieve an optimal match between radial tension force and the paper tube's bearing capacity: if the taper is too small (e.g., <8°), the radial tension force generated under the same axial displacement is insufficient, making it difficult to effectively fix small-diameter paper tubes and easily leading to slippage during film spreading; if the taper is too large (e.g., >12°), the radial force increases too rapidly, causing localized stress concentration on the inner wall of the paper tube, especially for thin-walled small-diameter paper tubes, which may cause cracking or permanent deformation. This range ensures that the tension force increases linearly and smoothly with displacement within the extrusion stroke, meeting the fixing requirements while avoiding damage to the paper tube.

[0041] In one embodiment, the outer wall surfaces of the first conical abutment portion 211 and the second conical abutment portion 311 are covered with a rubber layer.

[0042] Understandably, during the film spreading process, the tensioning device needs to use the friction between the conical contact part and the inner wall of the film tube to fix the tube and prevent it from rotating or sliding. The rubber layer has a high coefficient of friction, which significantly increases the friction between the rubber layer and the inner wall of the paper tube compared to the surface of the conical contact part made of materials such as metal. This makes it less likely for the paper tube to move relative to the metal under the same tensioning force, thereby improving the reliability and stability of the tensioning process, ensuring smooth film spreading, and reducing problems such as uneven film spreading and film damage caused by paper tube slippage.

[0043] Reference Figure 1 According to the present invention, a tensioning device 10 for PE film spreading machinery in the roll material industry is provided. The outer circumferential surface of the rotating shaft body 100 near both ends is provided with external thread sections 110. The two external thread sections 110 are positive and negative threads. The first extrusion component 200 and the second extrusion component 300 are respectively threadedly connected through the corresponding external thread sections 110.

[0044] It is understandable that by providing external thread sections 110 with opposite threads at both ends of the shaft body 100, a structural basis is provided for the relative movement of the first extrusion assembly 200 and the second extrusion assembly 300. When the shaft rotates, because the threads at both ends are in opposite directions, the assemblies connected to the threads at both ends can produce movements in opposite directions.

[0045] The threaded connection allows the first extrusion assembly 200 and the second extrusion assembly 300 to fit tightly with the external thread section 110 on the rotating shaft body 100. When the rotating shaft rotates, based on the characteristics of threaded transmission, the first extrusion assembly 200 and the second extrusion assembly 300 will move linearly along the axial direction of the rotating shaft. Furthermore, since the two external thread sections 110 are opposite threads, the two extrusion assemblies will move in opposite directions, thereby realizing the extrusion or release operation of the PE film material, achieving the purpose of tightening the PE film material, ensuring the flatness and tension stability of the film material during the film spreading process, and improving the film spreading quality and production efficiency.

[0046] Reference Figure 1 According to the present invention, a tensioning device 10 for PE film spreading machinery in the roll material industry is provided. The first extrusion assembly 200 includes a first pair of pressure sleeves 210 and a first clamping nut 220. The first pair of pressure sleeves 210 is provided with a first conical abutment portion 211 on the side facing the film paper tube. The first clamping nut 220 is connected to the side of the first pair of pressure sleeves 210 away from the first conical abutment portion 211. The first clamping nut 220 is threadedly connected to the external thread section 110.

[0047] Understandably, during the film spreading process, when the first extrusion assembly 200 applies force to the film material tube, the first conical contact portion 211 comes into contact with the film material tube. The conical design allows the contact area to gradually change, enabling more even force transmission to the film material tube when pressure is applied. This avoids damage to the film material tube or the film material due to excessive localized force. At the same time, the conical structure helps to better conform to the shape of the film material tube, enhancing the stability and reliability of the extrusion and ensuring effective tensioning of the film material by the tensioning equipment.

[0048] The first clamping nut 220 serves to adjust and fix the position of the first pair of pressure sleeves 210. By rotating the first clamping nut 220, the position of the first pair of pressure sleeves 210 relative to other components can be changed, thereby adjusting the degree of compression of the film paper tube by the first pair of pressure sleeves 210, and thus realizing flexible adjustment of the tension force of the film material to meet the tension force requirements of different specifications of film materials or different film spreading processes.

[0049] The threaded connection provides a reliable connection and fixing foundation for the first clamping nut 220. The external thread section 110 provides a track for the rotational movement of the first clamping nut 220, allowing it to move linearly along the thread section 110, thereby achieving precise position adjustment. Simultaneously, the threaded connection has self-locking properties, ensuring that the first clamping nut 220 will not easily loosen after being adjusted to the appropriate position, maintaining a stable compression state of the first pair of pressure sleeves 210 on the film paper tube, and ensuring the stability and continuity of the tension force during film spreading.

[0050] Reference Figure 1According to the present invention, a tensioning device 10 for PE film spreading machinery in the roll material industry is provided. The second extrusion assembly 300 includes a second pair of pressure sleeves 310 and a second clamping nut 320. The second pair of pressure sleeves 310 is provided with a second conical abutment part 311 on the side facing the film paper tube. The second clamping nut 320 is connected to the side of the second pair of pressure sleeves 310 away from the second conical abutment part 311. The second extrusion assembly 300 and the rotating shaft body 100 are threadedly connected by the second clamping nut 320 and the corresponding external thread section 110.

[0051] Understandably, the second pair of pressure sleeves 310 is provided with a second conical abutment part 311 facing the film material tube. Its function is to ensure that the second conical abutment part 311 can form an effective abutment contact with the film material tube when the equipment is running. The conical design allows the contact surface to have a certain degree of angle and shape adaptability, which can better fit the end contour of the film material tube. During the film spreading process, it applies a stable and uniform squeezing force to the film material tube, which helps to prevent the film from shifting, loosening or slipping during the spreading process, ensuring that the film can spread smoothly and steadily, and improving the quality and stability of film spreading.

[0052] The second clamping nut 320 is connected to the side of the second pair of pressure sleeves 310 opposite to the second conical abutment portion 311. By rotating the second clamping nut 320, the pressure it exerts on the second pair of pressure sleeves 310 can be changed, thereby adjusting the degree of compression of the film paper tube by the second conical abutment portion 311. This allows the equipment to adapt to film paper tubes of different specifications, materials, and film spreading requirements, enhancing the equipment's versatility and flexibility.

[0053] The threaded connection provides a reliable connection and fixing foundation for the second clamping nut 320. The external thread section 110 provides a track for the rotational movement of the second clamping nut 320, allowing it to move linearly along the thread section 110, thereby achieving precise position adjustment. Simultaneously, the threaded connection has self-locking properties, ensuring that the second clamping nut 320 will not easily loosen after adjustment to the appropriate position, maintaining a stable compression state of the second pair of pressure sleeves 310 on the film paper tube, and ensuring the stability and continuity of the tension force during film spreading.

[0054] In some embodiments, the drive adjustment mechanism includes a handwheel and a gearbox. One end of the rotating shaft body 100 is provided with a transmission gear 400. The handwheel is fixedly connected to the input shaft of the gearbox. The output gear of the gearbox meshes with the transmission gear 400, so that the handwheel drives the rotating shaft body 100 to rotate through the meshing of the gearbox and the transmission gear 400.

[0055] It is understood that, through the connection and transmission relationship between the handwheel, gearbox and transmission gear 400, the operator only needs to turn the handwheel to accurately drive the rotating shaft body 100 to rotate with the help of the transmission action of the gearbox, thereby realizing the adjustment and control of the PE film spreading and tensioning mechanical equipment, and meeting the operational requirements of PE film spreading and tensioning in the roll material industry.

[0056] In some embodiments, the drive adjustment mechanism includes a drive motor and a gearbox. One end of the rotating shaft body 100 is provided with a transmission gear 400. The drive motor is connected to the input shaft of the gearbox, and the output gear of the gearbox meshes with the transmission gear 400, so that the drive motor drives the rotating shaft body 100 to rotate through the meshing of the gearbox and the transmission gear 400.

[0057] It is understood that this embodiment achieves automated operation through the combination of a drive motor and a gearbox, allowing operators to drive the rotating shaft body 100 simply by pressing a button. This reduces operational steps, improves operational efficiency, adapts to high-frequency operation scenarios, and enhances production efficiency.

[0058] In some embodiments, two shaft end blocks are further included. The two shaft end blocks are axially spaced along the shaft body 100 and correspond one-to-one with the first extrusion assembly 200 and the second extrusion assembly 300, respectively. The shaft end block corresponding to the first extrusion assembly 200 is located on the side closer to the second extrusion assembly 300, and the shaft end block corresponding to the second extrusion assembly 300 is located on the side closer to the first extrusion assembly 200. The shaft end blocks are used to limit the maximum stroke of each when the first extrusion and the second extrusion assembly 300 move toward each other.

[0059] Understandably, during the operation of the film spreading and tensioning equipment, the first extrusion assembly 200 and the second extrusion assembly 300 move towards each other to compress and tension the film tube. Shaft end stops are spaced apart along the axial direction of the rotating shaft body 100 and correspond one-to-one with the two extrusion assemblies. When the extrusion assemblies move towards each other, the shaft end stops precisely limit their maximum stroke. This ensures that the extrusion assemblies do not move excessively, avoiding damage to the film tube or the film itself due to excessive compression, thus guaranteeing the stability of the film spreading process and the quality of the film.

[0060] In some embodiments, two main keyways are provided on the optical shaft end of the rotating shaft body 100 located between two external threaded sections 110. The two main keyways correspond one-to-one with the first extrusion assembly 200 and the second extrusion assembly 300, respectively. Sub-keyways are provided at corresponding positions on the inner walls of the first extrusion assembly 200 and the second extrusion assembly 300. When the first extrusion assembly 200 and the second extrusion assembly 300 move to a preset position, locking keys are embedded in the main keyways and sub-keyways to lock the axial position of the first extrusion assembly 200 and the second extrusion assembly 300 on the rotating shaft body 100.

[0061] Understandably, during the operation of the film stretching and tensioning equipment, the first extrusion component 200 and the second extrusion component 300 are subjected to various forces, such as film tension and equipment vibration. These forces may cause the components to move axially on the rotating shaft body 100, thereby affecting the tension of the film. By opening a main keyway at the optical axis end of the rotating shaft body 100, setting a secondary keyway at the corresponding position on the inner wall of the component, and embedding a locking key, the component can be firmly connected to the rotating shaft body 100, effectively preventing accidental movement of the component in the axial direction and ensuring that the component works stably in the preset position.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A mechanical tensioning device for spreading PE film in the roll film industry, characterized in that, include: The rotating shaft body can be movably inserted into the membrane material paper tube; The first extrusion assembly is movably connected to one end of the rotating shaft body along its own axis and movably abuts against the film material paper tube. The first extrusion assembly has a first conical abutment part on the side facing the film material paper tube, and the first conical abutment part is arranged to gradually increase in size away from the film material paper tube. The second extrusion assembly is movably connected to the other end of the rotating shaft body along its own axis and movably abuts against the film material tube. The second extrusion assembly has a second conical abutment part on the side facing the film material tube, and the second conical abutment part is arranged to gradually increase in size away from the film material tube. A drive adjustment mechanism is connected to the first extrusion assembly and the second extrusion assembly respectively, and drives the two to move synchronously towards or away from each other, so as to press against or loosen the film paper tube between the first extrusion assembly and the second extrusion assembly.

2. The mechanical tensioning device for PE film spreading in the roll film industry according to claim 1, characterized in that, The taper of the first conical abutment portion or the second conical abutment portion is 8°~12°.

3. The mechanical tensioning device for PE film spreading in the roll film industry according to claim 2, characterized in that, The outer walls of the first and second conical abutment portions are covered with a rubber layer.

4. The mechanical tensioning device for PE film spreading in the roll film industry according to any one of claims 1-3, characterized in that, The outer circumferential surface of the shaft body near both ends is provided with external thread sections, and the two external thread sections are opposite threads to each other. The first extrusion component and the second extrusion component are respectively threadedly connected through the corresponding external thread sections.

5. The mechanical tensioning device for PE film spreading in the roll film industry according to claim 4, characterized in that, The first extrusion assembly includes a first pair of pressure sleeves and a first clamping nut. The first pair of pressure sleeves is provided with the first conical abutment portion on the side facing the film paper tube. The first clamping nut is connected to the side of the first pair of pressure sleeves away from the first conical abutment portion. The first clamping nut is threadedly connected to the external thread section.

6. The mechanical tensioning device for PE film spreading in the roll film industry according to claim 4, characterized in that, The second extrusion assembly includes a second pair of pressure sleeves and a second clamping nut. The second pair of pressure sleeves is provided with a second conical abutment on the side facing the film paper tube. The second clamping nut is connected to the side of the second pair of pressure sleeves away from the second conical abutment. The second extrusion assembly and the rotating shaft body are threadedly connected by the second clamping nut and the corresponding external thread section.

7. The mechanical tensioning device for PE film spreading in the roll film industry according to any one of claims 1-3, characterized in that, The drive adjustment mechanism includes a handwheel and a gearbox. One end of the rotating shaft body is provided with a transmission gear. The handwheel is fixedly connected to the input shaft of the gearbox. The output gear of the gearbox meshes with the transmission gear, so that the handwheel drives the rotating shaft body to rotate through the meshing of the gearbox and the transmission gear.

8. The mechanical tensioning device for PE film spreading in the roll film industry according to any one of claims 1-3, characterized in that, The drive adjustment mechanism includes a drive motor and a gearbox. One end of the rotating shaft body is provided with a transmission gear. The drive motor is connected to the input shaft of the gearbox. The output gear of the gearbox meshes with the transmission gear, so that the drive motor drives the rotating shaft body to rotate through the meshing of the gearbox and the transmission gear.

9. The mechanical tensioning device for PE film spreading in the roll film industry according to any one of claims 1-3, characterized in that, It also includes two shaft end blocks, which are spaced apart along the axial direction of the rotating shaft body and correspond one-to-one with the first extrusion assembly and the second extrusion assembly, respectively. The shaft end block corresponding to the first extrusion assembly is located on the side closer to the second extrusion assembly, and the shaft end block corresponding to the second extrusion assembly is located on the side closer to the first extrusion assembly. The shaft end blocks are used to limit the maximum stroke of each when the first extrusion assembly and the second extrusion assembly move toward each other.

10. The mechanical tensioning equipment for PE film spreading in the roll film industry according to claim 4, characterized in that, Two main keyways are formed on the optical shaft end located between the two external threaded sections on the shaft body. The two main keyways correspond one-to-one with the first extrusion assembly and the second extrusion assembly, respectively. The inner walls of the first extrusion assembly and the second extrusion assembly are respectively provided with secondary keyways at corresponding positions. When the first extrusion assembly and the second extrusion assembly move to a preset position, locking keys are embedded in the main keyways and the secondary keyways to lock the axial position of the first extrusion assembly and the second extrusion assembly on the shaft body.

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