Expansion shaft mechanism of film slitting and winding arm machine and film slitting and winding device

Abstract

The utility model relates to an expansion shaft mechanism of a film slitting and winding arm machine and a film slitting and winding device, and belongs to the field of film slitting and winding equipment. The utility model relates to a film slitting winding arm machine expansion shaft mechanism which comprises a winding arm, a middle shaft, a first driving piece, a machine expansion shaft, an extrusion piece, a second driving piece and a plurality of machine expansion keys. The periphery of the machine expansion shaft is sleeved with the paper core, a second driving part is used for driving an extrusion part, the extrusion part drives a plurality of machine expansion keys to penetrate out of the periphery of the machine expansion shaft so as to abut against the inner wall of the paper core arranged on the periphery of the machine expansion shaft in a sleeving mode, and stable tensioning is achieved; the first driving part is used for driving the middle shaft to rotate on the winding arm so as to synchronously drive the machine expansion shaft to rotate, and rotation of the paper core is achieved so as to wind the thin film.

Description

Technical Field

[0001] The utility model relates to the field of film slitting and winding equipment, in particular to a film slitting and winding arm machine expansion shaft mechanism and a film slitting and winding device. Background Art

[0002] Before packaging into finished products, films need to be slit into different lengths and widths according to customer specifications and then rolled onto a paper core (paper tube) to form the finished product. Existing film slitting and winding devices place the paper core around the periphery of the device's clamping head, which clamps the inner wall of the core before slitting and winding the film. However, the clamping head of existing film slitting and winding devices cannot stably tension the paper core during slitting and winding, especially for paper cores with smaller winding widths, where slippage between the clamping head and the core is likely to occur. Utility Model Content

[0003] Based on this, the purpose of the present invention is to provide a film slitting and winding arm machine expansion shaft mechanism and a film slitting and winding device, which can achieve tensioning of the paper core.

[0004] A film slitting and winding arm expansion shaft mechanism comprises a winding arm, a central shaft, a first driving member, a machine expansion shaft, an extruding member, a second driving member and a plurality of machine expansion keys; one end of the central shaft is rotatably arranged on the winding arm; the first driving member is used to drive the central shaft to rotate; the machine expansion shaft is fixedly arranged at the other end of the central shaft, a first axial sliding groove is provided in the middle of the machine expansion shaft, and a plurality of second sliding grooves are radially provided on the outer periphery of the first sliding groove and penetrate the outer periphery of the machine expansion shaft; the extruding member is axially movably arranged in the first sliding groove; the second driving member is used to drive the extruding member to reciprocate axially in the first sliding groove; the plurality of machine expansion keys are respectively slidably arranged in the plurality of second sliding grooves, one end of the plurality of machine expansion keys respectively wedge-fitting with the outer periphery of the extruding member; when the second driving member drives the extruding member to move in the first axial direction in the first sliding groove, the extruding member drives the plurality of machine expansion keys to slide radially outward in the second sliding groove, and causes the other ends of the plurality of machine expansion keys to respectively pass through the outer periphery of the machine expansion shaft.

[0005] The film slitting and winding arm mechanical expansion shaft mechanism of the present invention sleeves one end of the paper core onto the mechanical expansion shaft. A second driving member drives the extrusion member to move in a first axial direction (wherein the first direction refers to the direction in which the extrusion member moves toward the interior of the first chute) within the first chute. The outer periphery of the extrusion member abuts and drives the plurality of mechanical expansion keys to slide radially outward within the second chute, causing the other ends of the plurality of mechanical expansion keys to pass through the outer periphery of the mechanical expansion shaft and abut against the inner wall of the paper core, thereby tensioning the paper core. The first driving member drives the central shaft to rotate, thereby driving the mechanical expansion shaft to rotate, thereby rotating the paper core for film slitting and winding.

[0006] As a preferred solution, the film slitting and winding arm machine expansion shaft mechanism also includes a plurality of elastic members; the plurality of elastic members are respectively arranged between the plurality of machine expansion keys and the machine expansion shaft, and one end of the plurality of elastic members is respectively in contact with the plurality of machine expansion keys, and the other end is respectively in contact with the machine expansion shaft; when the second driving member drives the extrusion member to move in the first sliding groove along the first axial direction, the plurality of elastic members are respectively compressed; when the second driving member drives the extrusion member to move in the first sliding groove along the second axial direction opposite to the first direction, the plurality of machine expansion keys slide radially inward in the second sliding groove under the elastic force of the plurality of elastic members in the compressed state, and the other end of the plurality of machine expansion keys slides into the second sliding groove. The utility model arranges the plurality of elastic members so that when the second driving member drives the extrusion member to move in the first slide groove along the second axial direction (wherein the second direction refers to the direction in which the extrusion member moves toward the outside of the first slide groove), under the action of the plurality of elastic members, the plurality of machine expansion keys slide radially inward in the second slide groove respectively, and the other ends of the plurality of machine expansion keys retreat into the second slide groove, thereby achieving the loosening of the paper core.

[0007] As a preferred embodiment, the extrusion member is truncated cone-shaped; one end of each of the plurality of mechanical expansion keys is provided with a wedge surface. When the second driving member drives the extrusion member to move axially in the first chute along the first direction, the truncated cone-shaped extrusion member presses against the wedge surface at one end of each of the plurality of mechanical expansion keys, causing the plurality of mechanical expansion keys to slide in the plurality of second chute slots, respectively, so that the other ends of the plurality of mechanical expansion keys respectively pass through the outer circumference of the mechanical expansion shaft.

[0008] As a preferred embodiment, the plurality of mechanical expansion keys are all L-shaped, each comprising a first mechanical expansion key portion and a second mechanical expansion key portion disposed perpendicularly to the first mechanical expansion key portion; the wedge surface is provided on a side of the first mechanical expansion key portion distal to the second mechanical expansion key portion. When the second driving member drives the extrusion member to move axially in the first chute along the first direction, the extrusion member drives the first mechanical expansion key portion and, consequently, the second mechanical expansion key portion to slide radially outward in the second chute, causing the distal end of the second mechanical expansion key portion (the end distal to the first mechanical expansion key portion) to protrude from the outer circumference of the mechanical expansion shaft.

[0009] As a preferred solution, each second slide groove includes a first machine expansion key slide groove and a second machine expansion key slide groove connected to the first machine expansion key slide groove, the first machine expansion key slide groove is used to accommodate the sliding of the first machine expansion key, and the second machine expansion key slide groove is used to accommodate the sliding of the second machine expansion key; the first machine expansion key slide groove radially extends from the outer periphery of the first slide groove but does not pass through the outer periphery of the machine expansion shaft, and the second machine expansion key slide groove radially passes from the outer periphery of the first slide groove to the outer periphery of the machine expansion shaft; the plurality of elastic members are respectively arranged on the first and second ends of the plurality of machine expansion keys between one side of a mechanical expansion key part close to the second mechanical expansion key part and the sliding groove of the first mechanical expansion key part; when the second driving member drives the extrusion member to move along the first axial direction in the first sliding groove, the extrusion member drives the first mechanical expansion key parts of the plurality of mechanical expansion keys to slide radially outward in the sliding groove of the first mechanical expansion key part, compressing the elastic member, and at the same time, the first mechanical expansion key part drives the second mechanical expansion key part to slide radially outward in the sliding groove of the second mechanical expansion key part, so that the end of the second mechanical expansion key part away from the first mechanical expansion key part passes through the outer periphery of the mechanical expansion shaft.

[0010] As a preferred solution, the central shaft is a hollow structure; the central shaft is coaxially arranged with the expansion shaft; the first chute is located on the expansion shaft at one end near the central shaft and is axially opened at the central axis position; the second driving member is a telescopic cylinder, including a telescopic cylinder body and a cylinder rod, the telescopic cylinder body can drive the cylinder rod to perform telescopic movement; the cylinder rod is also rotatably arranged on the telescopic cylinder body; the telescopic cylinder is arranged on one side of the winding arm and is located outside one end of the central shaft; the cylinder rod of the telescopic cylinder extends from one end of the central shaft into the central shaft and extends to the other end of the central shaft to connect with the extrusion member. When the telescopic cylinder body drives the cylinder rod to perform telescopic movement, it drives the extrusion member to move axially back and forth in the first chute. By rotatably setting the cylinder rod on the telescopic cylinder body, the tension stability of the paper core is guaranteed during the film winding process.

[0011] As a preferred solution, the telescopic cylinder body is provided with a pressure-maintaining air circuit. By providing the pressure-maintaining air circuit, the expansion shaft mechanism of the film slitting and winding arm machine can more stably tension the paper core.

[0012] As a preferred solution, one end of the central shaft is rotatably mounted on the upper portion of the winding arm via a bearing. The first driving member includes a motor, a first pulley mounted on the central shaft, a second pulley mounted on the motor's output shaft, and a conveyor belt mounted between the first and second pulleys. The motor drives the second pulley to rotate, which in turn drives the first pulley via the conveyor belt. This rotation of the central shaft drives the expansion shaft and the paper core mounted on its outer circumference to facilitate film slitting and winding.

[0013] The utility model also provides a film slitting and winding device, comprising any of the above-mentioned film slitting and winding arm machine expansion shaft mechanisms.

[0014] As a preferred solution, the film slitting and winding device includes two film slitting and winding arm expansion shaft mechanisms and a paper core; the two winding arms can approach or move away from each other, and the two ends of the paper core are respectively mounted on the outer circumference of the two expansion shafts.

[0015] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the film slitting and winding device of the present invention;

[0017] Figure 2 This is a structural diagram of the expansion shaft mechanism of the film slitting and winding arm machine of the present invention;

[0018] Figure 3 It is a half-section schematic diagram of the expansion shaft mechanism of the film slitting and winding arm machine of the present invention;

[0019] Figure 4 for Figure 3 An enlarged schematic diagram of point A in FIG.

[0020] Figure 5 Schematic diagram of the connection structure between the second driving member (telescopic cylinder) and the extrusion member;

[0021] Figure 6 It is a structural diagram of the central axis;

[0022] Figure 7 This is a schematic diagram of the assembly structure of the expansion shaft, expansion key and elastic member;

[0023] Figure 8 It is a structural diagram of the expansion shaft;

[0024] Figure 9 This is a half-section schematic diagram of the expansion shaft;

[0025] Figure 10 Schematic diagram of the assembly structure of the machine expansion key and the elastic part;

[0026] Figure 11 It is a structural diagram of a single machine expansion key;

[0027] Figure 12 This is a schematic diagram of the explosion structure of the expansion shaft;

[0028] Figure 13 It is a half-section schematic diagram of the assembly structure of the expansion shaft, expansion key and elastic part. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Furthermore, the terms "first," "second," "third," etc., in the specification and claims are used solely for descriptive purposes to distinguish between identical technical features. They are not to be construed as indicating or implying relative importance, or as implicitly specifying the number of technical features, nor do they necessarily describe a sequential or chronological order. The terms are interchangeable where appropriate. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one of those features.

[0031] Similarly, the term "connected" used in the specification and claims should not be construed as limited to direct connections. Thus, the expression "device A is connected to device B" should not be limited to devices or systems in which device A is directly connected to device B. Rather, it means that there is a path between device A and device B, which may include other devices or tools.

[0032] Example 1

[0033] Before packaging into finished products, films need to be slit into different lengths and widths according to customer specifications and then rolled onto a paper core (paper tube) to form the finished product. Existing film slitting and winding devices place the paper core around the periphery of the device's clamping head, which clamps the inner wall of the core before slitting and winding the film. However, the clamping head of existing film slitting and winding devices cannot stably tension the paper core during slitting and winding, especially for paper cores with smaller winding widths, where slippage between the clamping head and the core is likely to occur.

[0034] Therefore, this embodiment provides a film slitting and winding arm machine expansion shaft mechanism and a film slitting and winding device, which can achieve tensioning of the paper core.

[0035] The film slitting and winding arm machine expansion shaft mechanism 10 of this embodiment is shown in FIG. Figures 1-4 The paper core 20 is sleeved around the outer periphery of the mechanical expansion shaft 4. The second driving member 6 drives the extruding member 5, which drives the mechanical expansion keys 7 to extend out of the outer periphery of the mechanical expansion shaft 4. This abuts the inner wall of the paper core 20 sleeved around the mechanical expansion shaft 4 to achieve stable tension. The first driving member 3 drives the central shaft 2 to rotate on the winding arm 1, thereby synchronously driving the mechanical expansion shaft 4 to rotate, thereby rotating the paper core 20 to wind the film.

[0036] In this example, see Figure 1 and Figure 2 One end of the central shaft 2 is rotatably mounted on the winding arm 1. The first driving member 3 is used to drive the central shaft 2 to rotate. The expansion shaft 4 is fixedly mounted on the other end of the central shaft 2. When the first driving member 3 drives the central shaft 2 to rotate, it simultaneously drives the expansion shaft 4 to rotate, thereby rotating the paper core mounted on the outer periphery of the expansion shaft 4 to wind the film. Before winding the film, the paper core needs to be tensioned to prevent the paper core and the expansion shaft 4 from slipping during rotation. In this embodiment, please refer to Figure 4 、 Figure 7-Figure 9 The central axis of the expansion shaft 4 is provided with an axial first sliding groove 41, and the outer periphery of the first sliding groove 41 is provided with a plurality of second sliding grooves 42 that pass through the outer periphery of the expansion shaft 4. Figure 4 The extrusion member 5 is axially movable in the first chute 41; the second driving member 6 is used to drive the extrusion member 5 to move back and forth in the axial direction in the first chute 41. Figure 4 、 Figure 7-10, a number of machine expansion keys 7 are slidably arranged in a number of second slide grooves 42, and one end of a number of machine expansion keys 7 is respectively wedge-fitted with the outer periphery of the extrusion member 5; when the second driving member 6 drives the extrusion member 5 to move in the first axial direction (in this embodiment, it refers to the internal direction of the first slide groove 41) in the first slide groove 41, the extrusion member 5 drives the number of machine expansion keys 7 to slide radially outward in the second slide groove 42 under the action of wedge-fitting, and makes the other ends of the number of machine expansion keys 7 pass through the outer periphery of the machine expansion shaft 4, and abut against the inner wall of the paper core sleeved on the outer periphery of the machine expansion shaft 4, thereby achieving tensioning of the paper core.

[0037] Therefore, in this embodiment, by sleeveing ​​the paper core on the outer periphery of the machine expansion shaft 4, the second driving member 6, the extruding member 5, and the plurality of machine expansion keys 7 are first used to cooperate so that the other ends of the plurality of machine expansion keys 7 respectively pass through the outer periphery of the machine expansion shaft 4 and abut against the inner wall of the sleeved paper core, thereby achieving stable tensioning of the paper core; and then the first driving member 3 is used to drive the central axis to rotate, thereby achieving rotation of the machine expansion shaft 4 and the paper core that is stably tensioned on the outer periphery of the machine expansion shaft 4, so as to facilitate winding of the film.

[0038] In order to facilitate the release of the tension of the paper core after the film is rolled up. Figure 7 、 Figure 10 and Figure 13 The film slitting and winding arm expansion shaft mechanism 10 further includes a plurality of elastic members 8, each of which is a spring. The plurality of elastic members 8 are disposed between the plurality of expansion keys 7 and the expansion shaft 4. One end of each of the elastic members 8 abuts the plurality of expansion keys 7, and the other end abuts the expansion shaft 4. When the second driving member 6 drives the extrusion member 5 to move in the first chute 41 in a first axial direction (in this embodiment, along the interior of the first chute 41), the plurality of elastic members are compressed. When the second driving member 6 drives the extrusion member 5 to move in the first chute 41 in a second axial direction (opposite to the first direction, i.e., along the exterior of the first chute 41), the plurality of expansion keys 7 slide radially inward in the second chute 42 under the elastic force of the compressed plurality of elastic members 8, causing the plurality of expansion keys 7 to slide into the second chute 42, thereby retracting the other ends of the plurality of expansion keys 7 into the second chute 42, thereby releasing the tension on the paper core and loosening the paper core.

[0039] In this example, see Figure 10 and Figure 11The end surfaces of the plurality of expansion keys 7 are each provided with a wedge surface 711. Specifically, in this embodiment, the plurality of expansion keys 7 are L-shaped, each comprising a first expansion key portion 71 and a second expansion key portion 72 disposed perpendicularly thereto. A wedge surface 711 is provided on the side of the first expansion key portion 71 facing away from the second expansion key portion 72 (i.e., the end surface of one end of the expansion key 7). The outer periphery of the extrusion member 5 is wedge-engaged with the wedge surfaces 711 of the first expansion key portion 71 of the plurality of expansion keys 7. When the second driving member 6 drives the extrusion member 5 to move in the first axial direction within the first slide groove 41, the extrusion member 5 drives the first expansion key portion 71 and the second expansion key portion 72 to slide radially outward within the second slide groove 42, causing the distal end of the second expansion key portion 72 (the end facing away from the first expansion key portion 71) to protrude beyond the outer periphery of the expansion shaft 4.

[0040] In this example, see Figure 5 The extrusion piece 5 is in a truncated cone shape. By adopting the truncated cone design, the outer periphery of the extrusion piece 5 can be used to form a wedge-shaped fit with the wedge surfaces 711 of the several machine expansion keys 7, which is beneficial when the second driving member 6 drives the extrusion piece 5 to move along the first axial direction in the first slide groove 41. The truncated cone-shaped extrusion piece 5 squeezes and abuts the wedge surfaces 711 of the several machine expansion keys 7, so that the several machine expansion keys 7 slide in the several second slide grooves 42 respectively, so that the other ends of the several machine expansion keys 7 respectively pass through the outer periphery of the machine expansion shaft 4.

[0041] In order to facilitate the sliding of the expansion key 7 and the arrangement of the elastic member 8, in this embodiment, please refer to Figure 8 , Figure 9 and Figure 12Each second chute 42 includes a first mechanical expansion key chute 421 and a second mechanical expansion key chute 422 communicating with the first mechanical expansion key chute 421. The first mechanical expansion key chute 421 accommodates the sliding movement of the first mechanical expansion key 71, while the second mechanical expansion key chute 422 accommodates the sliding movement of the second mechanical expansion key 72. The first mechanical expansion key chute 421 extends radially from the outer periphery of the first chute 41 but does not penetrate the outer periphery of the mechanical expansion shaft 4. The second mechanical expansion key chute 421 extends radially from the outer periphery of the first chute to the outer periphery of the mechanical expansion shaft. An elastic member 8 is disposed between the other side of the first mechanical expansion key 71 (i.e., the side closest to the second mechanical expansion key 72) and the bottom wall of the first mechanical expansion key chute 741. One end of the elastic member 8 abuts the other side of the first mechanical expansion key 71, and the other end abuts the bottom wall of the first mechanical expansion key chute 741. When the second driving member 6 drives the extrusion member 5 to move in the first axial direction within the first slot 41, the extrusion member 5 causes the first expansion key portions 71 of the plurality of mechanical expansion keys 7 to slide radially outward within the first expansion key slot 421, compressing the elastic member 8. Simultaneously, the first expansion key portion 71 drives the second expansion key portion 72 to slide radially outward within the second expansion key slot 422, causing the distal end of the second expansion key portion 72 (the end distal from the first expansion key portion 71) to pass through the outer circumference of the mechanical expansion shaft 4. When the second driving member 6 drives the extrusion member 5 to move in the second axial direction within the first slot 41, the first expansion key portions 71 of the plurality of mechanical expansion keys 7 slide radially inward within the first expansion key slot 421 under the elastic force of the compressed elastic members 8. Simultaneously, the first expansion key portion 71 drives the second expansion key portion 72 to slide radially inward within the second expansion key slot 422, causing the distal end of the second expansion key portion 72 to retract into the second expansion key slot 422.

[0042] In this embodiment, in order to facilitate the assembly of the plurality of elastic members 8 and the plurality of mechanical expansion keys 7 in the mechanical expansion shaft 4, please refer to Figure 12In this embodiment, the mechanical expansion shaft 4 is designed as a separate component. Specifically, it is divided into a mechanical expansion shaft body 43 and a mechanical expansion shaft cover 44. The mechanical expansion shaft body 43 is divided axially into a first mechanical expansion shaft body portion 431 and a second mechanical expansion shaft body portion 432. The outer diameter of the first mechanical expansion shaft body portion 431 is smaller than that of the second mechanical expansion shaft body portion 432. A first chute 41 is defined in the mechanical expansion shaft body 43. Specifically, the first chute 41 extends axially from the first mechanical expansion shaft body portion 431 to the second mechanical expansion shaft body portion 432. The first mechanical expansion key chute 421 in the second chute 42 extends from the first mechanical expansion shaft body portion 431 to the outer periphery. The first mechanical expansion key chute 422 in the second chute 42 extends from the second mechanical expansion shaft body portion 431 to the outer periphery. In this embodiment, the expansion shaft cover 44 is annular and fits over the outer circumference of the first expansion shaft body 431. The inner wall of the expansion shaft cover 44 serves as the bottom wall of the first expansion key slot 421, facilitating contact with the other end of the elastic member 8. The outer diameter of the expansion shaft cover 44 is the same as that of the second expansion shaft body 432. The expansion shaft cover 44 and the second expansion shaft body 432 are secured together by bolts.

[0043] In this embodiment, the central shaft 2 is a hollow structure; the central shaft 2 is coaxially arranged with the expansion shaft 4; the first slide 41 is located on the end of the expansion shaft 4 close to the central shaft 2 and is axially opened at the center axis position. The end of the expansion shaft 4 away from the central shaft 2 is a closed end. The second driving member 61 is a telescopic cylinder, specifically a rotatable telescopic cylinder, see Figure 4 and Figure 5, including a telescopic cylinder body 611 and a cylinder rod 612. The telescopic cylinder body 611 can drive the cylinder rod 612 to perform telescopic movement; in addition, the cylinder rod 612 is rotatably arranged on the telescopic cylinder body 611. Specifically, the telescopic cylinder is arranged on one side of the winding arm 1 and is located outside one end of the central axis 2; the cylinder rod 612 of the telescopic cylinder extends from one end of the central axis 2 (the end away from the inflatable shaft 4) into the central axis 2, and extends to the other end of the central axis 2 to connect with the extrusion member 5. When the telescopic cylinder body 611 drives the cylinder rod 612 to perform telescopic movement, it drives the extrusion member 5 to move axially back and forth in the first slide groove 41. In addition, by rotatably setting the cylinder rod 612 on the telescopic cylinder body 611, it is beneficial to improve the tensioning stability of the paper core during film winding. Among them, when the other ends of several machine expansion keys 7 respectively pass through the outer periphery of the machine expansion shaft 4 and abut against the inner wall of the paper core sleeved on the outer periphery of the machine expansion shaft 4, the paper core is tensioned, and the first driving member 3 drives the middle shaft 2, the machine expansion shaft 4 and the paper core to rotate to perform film winding, since several machine expansion keys 7 rotate along with them, the extrusion member 5 has a tendency to rotate, and is rotatably provided on the telescopic cylinder body 611 through the cylinder rod 612, so that the extrusion member 5 and the cylinder rod 612 can rotate together to ensure the stability of the tensioning of the paper core. In addition, in order to facilitate the telescopic cylinder body 611 to maintain the stability of the telescopic state of the cylinder rod 612, the telescopic cylinder body 611 is designed with a pressure-maintaining air circuit. When the telescopic cylinder body 611 drives the cylinder rod 612 to drive the extrusion part 5 to drive several machine expansion keys 7 to slide radially outward in the second slide groove 42, and make the other ends of several machine expansion keys 7 pass through the outer periphery of the machine expansion shaft 4, and abut against the inner wall of the paper core sleeved on the outer periphery of the machine expansion shaft 4, the state is kept stable by the pressure-maintaining air circuit to stably tension the paper core.

[0044] In this example, see Figure 4 and Figure 6 The outer diameter of the central shaft 2 is smaller than the outer diameter of the mechanical expansion shaft 4. An extension connection portion 21 is radially provided outward on one end of the central shaft 2 close to the mechanical expansion shaft 4, so as to cover one end of the mechanical expansion shaft 4 with the extension connection portion, and is fixedly connected to the mechanical expansion shaft 4 axially through the extension connection portion 21 by a bolt, specifically fixedly connected to the first mechanical expansion shaft body portion 431 of the mechanical expansion shaft 4.

[0045] To facilitate the rotation of the central shaft 2, in this embodiment, one end of the central shaft 2 is rotatably disposed on the upper portion of the winding arm 1 via a bearing 11. The first driving member 3 includes a motor 31, a first pulley 32 mounted on the central shaft 2, a second pulley (not shown) mounted on the output shaft of the motor 31, and a conveyor belt (not shown) respectively mounted between the first pulley 31 and the second pulley. The motor 31 drives the second pulley to rotate, and drives the first pulley 32 to rotate via the conveyor belt, thereby driving the central shaft 2 to rotate. In this embodiment, the motor 31 is disposed at the lower portion of the winding arm 1, and the motor 31 and the central shaft 2 are located on the same side of the winding arm. The length of the central shaft 2 is greater than that of the motor 31, so that the length of the central shaft 2 is sufficient to pass over the motor 31 at the lower portion of the winding arm 1, thereby preventing the motor 31 from limiting the winding width.

[0046] This embodiment also provides a film slitting and winding device, comprising two film slitting and winding arm expansion shaft mechanisms 10 of this embodiment and a paper core 20. The two winding arms 1 of the two film slitting and winding arm expansion shaft mechanisms 10 can move closer to or further away from each other. Specifically, the two winding arms 1 are slidably mounted on a base frame 30. The two expansion shafts 4 of the two film slitting and winding arm expansion shaft mechanisms 10 are disposed facing each other, so that the distance between the two winding arms 1 can be adjusted by sliding, allowing the ends of the paper core 20 to be respectively sleeved around the outer circumferences of the two expansion shafts 4.

[0047] In this embodiment, in addition to adjusting the distance between the two winding arms 1 by sliding to adjust the distance between the two expansion shafts 4, the length of the middle shaft 2 can also be set according to actual needs to further adjust the distance between the two expansion shafts 4. Figure 1 and Figure 3 In the embodiment, the motors 31 of the two first driving members 3 are arranged on the inner sides of the two winding arms 1, which results in a problem of limited minimum width. By extending the central shaft 2, the requirements of the paper core 20 with a smaller width can be met.

[0048] The film slitting and winding device of this embodiment slides the distance between the two winding arms 1 on a base frame 30 to adjust the distance, allowing the ends of the paper core to be respectively mounted on the two expansion shafts 4 of the two film slitting and winding arm expansion shaft mechanisms 10. Each film slitting and winding arm expansion shaft mechanism 10 utilizes a second drive member 6 (telescopic cylinder) to drive an extrusion member 5 to move axially in a first chute 41. The outer periphery of the extrusion member 5 abuts and drives a plurality of expansion keys 7 to slide radially outward in second chute 42, compressing the elastic member 8 and causing the other ends of the expansion keys 42 to pass through the outer periphery of the expansion shaft 4 and abut against the inner wall of the paper core. Thus, the two film slitting and winding arm expansion shaft mechanisms 10 tension the ends of the paper core. A first drive member 3 (motor) drives the central shaft 2 to rotate, thereby driving the expansion shaft 4 to rotate, thereby rotating the paper core to perform film slitting and winding operations. When the film slitting and winding is completed, the first driving member 3 (motor) stops working; the second driving member 6 (telescopic cylinder) drives the extrusion member 5 to move in the first slide groove 41 in the opposite direction of the axial direction. Under the action of the elastic member 8, the other ends of the several machine expansion keys 42 are respectively retreated to the second slide groove 42, loosening the paper core.

[0049] The film slitting and winding device of this embodiment has a simple structure and can reduce the slitting and winding width, and can meet the slitting and winding requirements of smaller width films.

[0050] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the concept of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A film slitting and winding arm expansion mechanism, characterized by: It includes a winding arm, a central shaft, a first driving member, a machine expansion shaft, an extrusion member, a second driving member and a plurality of machine expansion keys; One end of the central shaft is rotatably provided on the winding arm; the first driving member is used to drive the central shaft to rotate; the machine expansion shaft is fixedly provided on the other end of the central shaft, and the middle part of the machine expansion shaft is provided with an axial first sliding groove, and the outer periphery of the first sliding groove is radially provided with a plurality of second sliding grooves that pass through the outer periphery of the machine expansion shaft; the extrusion member is movably provided in the first sliding groove along the axial direction; the second driving member is used to drive the extrusion member to reciprocate axially in the first sliding groove; the plurality of machine expansion keys are respectively slidably provided in the plurality of second sliding grooves, and one end of the plurality of machine expansion keys is respectively wedge-fitted with the outer periphery of the extrusion member; when the second driving member drives the extrusion member to move in the first sliding groove along the first axial direction, the extrusion member drives the plurality of machine expansion keys to slide radially outward in the second sliding groove, and makes the other ends of the plurality of machine expansion keys respectively pass through the outer periphery of the machine expansion shaft.

2. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 1, characterized in that: It also includes a plurality of elastic members; the plurality of elastic members are respectively arranged between the plurality of machine expansion keys and the machine expansion shaft, one end of the plurality of elastic members is respectively in contact with the plurality of machine expansion keys, and the other end is respectively in contact with the machine expansion shaft; when the second driving member drives the extrusion member to move in the first sliding groove along the first axial direction, the plurality of elastic members are respectively compressed; when the second driving member drives the extrusion member to move in the first sliding groove along the second axial direction opposite to the first direction, the plurality of machine expansion keys slide radially inward in the second sliding groove under the elastic force of the plurality of elastic members in the compressed state, and the other end of the plurality of machine expansion keys slides into the second sliding groove.

3. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 2, characterized in that: The extrusion piece is in a truncated cone shape; one end of each of the plurality of mechanical expansion keys is provided with a wedge surface.

4. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 3, characterized in that: The several mechanical expansion keys are all L-shaped, and each mechanical expansion key includes a first mechanical expansion key portion and a second mechanical expansion key portion arranged perpendicularly to the first mechanical expansion key portion; the wedge surface is provided on the side of the first mechanical expansion key portion away from the second mechanical expansion key portion.

5. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 4, characterized in that: Each second slide groove includes a first mechanical expansion key slide groove and a second mechanical expansion key slide groove connected to the first mechanical expansion key slide groove, the first mechanical expansion key slide groove is used to accommodate the sliding of the first mechanical expansion key, and the second mechanical expansion key slide groove is used to accommodate the sliding of the second mechanical expansion key; the first mechanical expansion key slide groove radially extends from the outer periphery of the first slide groove but does not pass through the outer periphery of the mechanical expansion shaft, and the second mechanical expansion key slide groove radially passes from the outer periphery of the first slide groove to the outer periphery of the mechanical expansion shaft; the plurality of elastic members are respectively arranged on the first mechanical expansion key part of the plurality of mechanical expansion keys between one side close to the second mechanical expansion key part and the sliding groove of the first mechanical expansion key part; when the second driving member drives the extrusion member to move along the first axial direction in the first sliding groove, the extrusion member drives the first mechanical expansion key parts of the plurality of mechanical expansion keys to slide radially outward in the sliding groove of the first mechanical expansion key part, compressing the elastic member, and at the same time, the first mechanical expansion key part drives the second mechanical expansion key part to slide radially outward in the sliding groove of the second mechanical expansion key part, so that the end of the second mechanical expansion key part away from the first mechanical expansion key part passes through the outer periphery of the mechanical expansion shaft.

6. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 1, characterized in that: The central axis is a hollow structure; the central axis is coaxially arranged with the expansion axis; the first slide groove is located on the expansion axis close to one end of the central axis and is axially opened at the center axis position; the second driving member is a telescopic cylinder, including a telescopic cylinder body and a cylinder rod, and the telescopic cylinder body can drive the cylinder rod to perform telescopic movement; the cylinder rod can also be rotatably arranged on the telescopic cylinder body; the telescopic cylinder is arranged on one side of the winding arm and is located outside one end of the central axis; the cylinder rod of the telescopic cylinder extends into the central axis from one end of the central axis, and extends to the other end of the central axis to be connected with the extrusion member.

7. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 6, characterized in that: The telescopic cylinder body is provided with a pressure-maintaining air circuit.

8. The expansion shaft mechanism of the film slitting and winding arm machine according to claim 1, characterized in that: One end of the central shaft is rotatably arranged on the upper part of the winding arm through a bearing; the first driving member includes a motor, a first pulley mounted on the central shaft, a second pulley mounted on the output shaft of the motor, and a conveyor belt respectively mounted between the first pulley and the second pulley; the motor drives the second pulley to rotate, and drives the first pulley to rotate through the conveyor belt.

9. A film slitting and winding device, characterized in that: It comprises the expansion shaft mechanism of the film slitting and winding arm machine as described in any one of claims 1-8.

10. The film slitting and winding device according to claim 9, characterized in that: It comprises two film slitting and winding arms, an expansion shaft mechanism and a paper core; wherein the two winding arms can be moved closer to or farther away from each other, and the two ends of the paper core are respectively sleeved on the outer periphery of the two expansion shafts.

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