Film roll unloading tool for a film roll uncoiler

Abstract

The application discloses a film roll unloading tool for a film unwinding machine, which comprises a guide rack provided with a positioning structure for positioning with the film unwinding machine, a ratchet mechanism configured to be engaged with the guide rack, a transmission frame sleeved on the guide rack and provided with a push plate for cooperating with the end of a mandrel in the film roll, and a driving frame connected with the ratchet mechanism and the transmission frame through a first rotating shaft. The driving frame is configured to drive the transmission frame to move unidirectionally along the guide rack under the action of external force through the ratchet mechanism, so as to drive the mandrel in the film roll to move through the push plate. The application can drive the transmission frame to move unidirectionally in a set direction through the pressure applied to the driving frame, so that the mandrel in the film roll can be driven to move through the push plate until the mandrel is separated from the taper head of the air expansion shaft, and the film roll can be smoothly unloaded.

Description

Technical Field

[0001] This application relates to the field of film unwinding technology, specifically to a film roll unloading tool for an unwinding machine. Background Technology

[0002] Film stretching technology, with "film stretching" as its core action, is widely used in packaging, industrial manufacturing, medical, and agricultural industries. It's a general term for technologies used to position, shape, laminate, or process films. The unwinding machine, as a key piece of equipment in the film stretching production line, directly affects the quality and efficiency of subsequent processes. With rapid technological advancements, unwinding machines have seen improvements in automation, unwinding speed, and film handling capacity. Simultaneously, the diameter and weight of film rolls are increasing, with some rolls and their cores weighing up to one ton. Currently, cylinders are typically used to push the film roll off the air shaft of the unwinding machine. However, when the film roll is too heavy, it can easily become stuck at the cone-shaped end of the air shaft during unloading, preventing proper unloading. Utility Model Content

[0003] This application aims to address one of the technical problems in the related art to a certain extent. To this end, this application provides a film roll unloading fixture for an unwinding machine.

[0004] To achieve the above objectives, this application adopts the following technical solution: a film roll unloading fixture for an unwinding machine, the film roll unloading fixture comprising:

[0005] The guide rack is provided with a positioning structure for positioning with the unwinding machine;

[0006] A ratchet mechanism configured to engage with the guide rack;

[0007] A transmission frame, which is sleeved on the guide rack and has a push plate for engaging with the end of the mandrel in the film roll; and,

[0008] A drive frame, which is connected to the ratchet mechanism and the transmission frame via a first rotating shaft;

[0009] The drive frame is configured to drive the transmission frame to move unidirectionally along the guide rack via a ratchet mechanism under external force, so as to push the mandrel in the film roll to move via the push plate.

[0010] The application of this application has the following beneficial effects: During use, the film roll unloading fixture can be positioned with the unwinding machine via the positioning structure on the guide rack, thereby ensuring that the guide rack remains fixed relative to the unwinding machine during the film roll unloading process. Through the cooperation of the drive frame, ratchet mechanism, and transmission frame, the transmission frame can be driven unidirectionally along the guide rack from the outside, thereby enabling the push plate to move the mandrel in the film roll until the mandrel disengages from the cone head of the air expansion shaft.

[0011] Optionally, the ratchet mechanism includes a ratchet, a drive pawl, and a stop pawl. The ratchet is rotatably mounted on the drive frame and the transmission frame via a first rotating shaft. The drive pawl is rotatably mounted on the drive frame via a second rotating shaft. The stop pawl is rotatably mounted on the transmission frame via a third rotating shaft. The first, second, and third rotating shafts are arranged in parallel and spaced apart. The drive pawl is configured to drive the ratchet to rotate in a set direction under the drive of the drive frame, and the stop pawl is configured to restrict the ratchet from rotating in the opposite direction along the set direction.

[0012] Optionally, the drive pawl engages with the ratchet in a one-way manner, and the ratchet mechanism further includes a first elastic element disposed between the drive pawl and the drive frame, such that the drive pawl tends to engage with the ratchet teeth on the ratchet and applies pressure to the drive pawl.

[0013] Optionally, the stop pawl and the guide rack are engaged in a one-way engagement, and the ratchet mechanism further includes a second elastic element, which is disposed between the stop pawl and the transmission frame and applies pressure to the stop pawl so that the stop pawl tends to engage with the teeth on the guide rack.

[0014] Optionally, the transmission frame includes a bottom wall and side walls disposed around the bottom wall. Two side walls along the length of the guide rack are provided with through holes, and the transmission frame is sleeved on the guide rack through the through holes. The push plate is disposed on the outer surface of the bottom wall, and the bottom wall and side walls cooperate to form an open cavity. The ratchet and the stop pawl both extend into the cavity through the open cavity.

[0015] Optionally, the cross-sectional shape of the perforation is a rectangle adapted to the guide rack, and the dimension of the perforation along the height direction is greater than the height dimension of the guide rack, so as to enable the teeth on the guide rack to separate from the ratchet teeth on the ratchet.

[0016] Optionally, the positioning structure is a positioning post with a stepped structure. The positioning post is locked to the guide rack by screws, and the positioning post is used for insertion and positioning with the bow-shaped overhead hole in the unwinding machine.

[0017] Optionally, the positioning structure is disposed at one end of the guide rack, and the other end of the guide rack is provided with an arc-shaped pressure strip that is adapted to the outer ring surface of the mandrel in the film roll.

[0018] Optionally, the cross-section of the arc-shaped pressure strip is circular, and the arc-shaped pressure strip is semi-circular in shape as a whole.

[0019] Optionally, the film roll unloading fixture further includes an operating handle, one end of which is mounted on the drive frame.

[0020] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0021] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0022] Figure 1 A schematic diagram of a film roll unloading fixture for an unwinding machine provided in an embodiment of this application;

[0023] Figure 2 Exploded view of the membrane roll unloading fixture;

[0024] Figure 3 Side view of the membrane roll unloading fixture;

[0025] Figure 4 This is a cross-sectional view of the membrane roll unloading fixture;

[0026] Figure 5 This is a schematic diagram illustrating the application of the membrane roll unloading tool.

[0027] Among them, 1. guide rack; 10. positioning structure; 11. arc-shaped pressure bar; 12. meshing tooth; 2. ratchet; 20. ratchet tooth; 3. drive pawl; 30. first elastic element; 4. stop pawl; 40. second elastic element; 5. transmission frame; 50. push plate; 51. first rotating shaft; 52. third rotating shaft; 53. perforation; 6. drive frame; 60. second rotating shaft; 7. operating handle; 8. film roll; 80. mandrel; 9. unwinding machine. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0029] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0030] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0031] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] This embodiment provides a film roll 8 unloading fixture for an unwinding machine 9, such as... Figure 1 , Figure 2 and Figure 5 As shown, the film roll 8 unloading fixture includes a guide rack 1, a ratchet mechanism, a transmission frame 5, and a drive frame 6. The guide rack 1 is equipped with a positioning structure 10 for positioning with the unwinding machine 9, and the ratchet mechanism is configured to mesh with the guide rack 1. The transmission frame 5 is sleeved on the guide rack 1 and is equipped with a push plate 50 for engaging with the end of the mandrel 80 in the film roll 8. The drive frame 6 is connected to the ratchet mechanism and the transmission frame 5 via a first rotating shaft 51. In this embodiment, the drive frame 6 is configured to drive the transmission frame 5 to move unidirectionally along the guide rack 1 via the ratchet mechanism under external force, thereby pushing the mandrel 80 in the film roll 8 to move via the push plate 50.

[0033] like Figure 5As shown, the film roll 8 unloading fixture can be positioned with the unwinding machine 9 via the positioning structure 10 on the guide rack 1 during use, thereby ensuring that the guide rack 1 remains fixed relative to the unwinding machine 9 during the unloading of the film roll 8. Through the cooperation of the drive frame 6, ratchet mechanism and transmission frame 5, the transmission frame 5 can be driven to move unidirectionally along the guide rack 1 from the outside, thereby pushing the mandrel 80 in the film roll 8 to move until the mandrel 80 disengages from the cone head of the air expansion shaft via the push plate 50.

[0034] The ratchet mechanism in this embodiment includes a ratchet 2, a driving pawl 3, and a stopping pawl 4. The ratchet 2 is rotatably mounted on the drive frame 6 and transmission frame 5 via a first rotating shaft 51. The driving pawl 3 is rotatably mounted on the drive frame 6 via a second rotating shaft 60. The stopping pawl 4 is rotatably mounted on the transmission frame 5 via a third rotating shaft 52. The first rotating shaft 51, the second rotating shaft 60, and the third rotating shaft 52 are arranged parallel and spaced apart. In this embodiment, the driving pawl 3 is configured to drive the ratchet 2 to rotate in a set direction under the drive of the drive frame 6, and the stopping pawl 4 is configured to restrict the ratchet 2 from rotating in the opposite direction. It should be noted that the second rotating shaft 60 serves both to rotatably connect the drive frame 6 and the driving pawl 3, and to transmit lateral torque, so that the external force acting on the drive frame 6 can be transmitted to the ratchet 2 through the second rotating shaft 60 and the driving pawl 3. Similarly, the first rotating shaft 51 can also transmit torque to the transmission frame 5 during the meshing and rolling of the ratchet 2 along the guide rack 1, so as to drive the transmission frame 5 and the push plate 50 set on the transmission frame 5 to move.

[0035] by Figure 3 Taking the perspective shown as an example, the set direction is clockwise. That is, when an external force is applied to the drive frame 6 and causes the drive frame 6 to swing in the clockwise direction, the ratchet 2 can be driven to rotate clockwise by the drive pawl 3, and at the same time the transmission frame 5 can be moved in the direction S.

[0036] Specifically, in combination Figure 2 , Figure 3 and Figure 4As shown, in this embodiment, the drive pawl 3 and ratchet 2 engage in a one-way engagement. The ratchet mechanism also includes a first elastic element 30, which is disposed between the drive pawl 3 and the drive frame 6 and applies pressure to the drive pawl 3 such that it tends to engage with the ratchet teeth 20 on the ratchet 2. It is easy to understand that the engagement between the drive pawl 3 and the ratchet 2 can refer to existing ratchet mechanisms. The "one-way engagement" means that the drive pawl 3 extends into the space between two adjacent ratchet teeth 20 on the ratchet 2. The end of the drive pawl 3 forms a guide surface that engages with one side of the ratchet teeth 20 and an abutment surface that engages with the other side of the ratchet teeth 20. When no other external force is applied, the end of the drive pawl 3 engages with the two adjacent ratchet teeth 20 on the ratchet 2 under the pressure of the first elastic element 30. When pressure is applied to the drive pawl 3 from the outside, one side of the drive pawl 3 can engage with the corresponding ratchet tooth 20 through a guide surface, allowing it to rotate relative to the ratchet 2 in that direction, causing the end of the drive pawl 3 to disengage from between the two ratchet teeth 20. However, because the other side of the drive pawl 3 abuts against the corresponding ratchet tooth 20, the end of the drive pawl 3 cannot disengage from between the two ratchet teeth 20 and will drive the ratchet 2 to rotate. The structure and working principle of the drive pawl 3 and ratchet 2 described above are existing technologies and will not be elaborated further here.

[0037] In this embodiment, the stop pawl 4, through its unidirectional engagement with the guide rack 1, serves to "restrict the reverse rotation of the ratchet 2 along a set direction." Specifically, in this embodiment, the stop pawl 4 engages unidirectionally with the guide rack 1. The ratchet mechanism also includes a second elastic element 40, which is disposed between the stop pawl 4 and the transmission frame 5, and applies pressure to the stop pawl 4 such that it tends to engage with the teeth 12 on the guide rack 1. Similarly to the aforementioned engagement between the drive pawl 3 and the ratchet 2, in this embodiment, the stop pawl 4 also engages unidirectionally with the teeth 12 of the guide rack 1. That is, under the action of the second elastic element 40, the stop pawl 4 will engage between two adjacent teeth 12 on the guide rack 1. When ratchet 2 rotates in the set direction, it rolls along guide rack 1. During this process, ratchet 2 drives stop pawl 4 to move along guide rack 1 via second shaft 60, transmission frame 5, and third shaft 52. As stop pawl 4 moves along guide rack 1, the end of stop pawl 4 repeatedly engages and disengages from the teeth 12 on guide rack 1.

[0038] In this embodiment, the transmission frame 5 includes a bottom wall and side walls disposed around the bottom wall. The bottom wall and side walls cooperate to form an open cavity. Figure 2 and Figure 4As shown, the transmission frame 5 has through holes 53 on both side walls along the length of the guide rack 1, through which it is fitted onto the guide rack 1. Simultaneously, a push plate 50 is disposed on the outer surface of the bottom wall, and the ratchet 2 and the stop pawl 4 extend into the cavity through open openings. This structural design allows the inner wall of the through holes 53 to engage with the guide rack 1, limiting the movement of the transmission frame 5 and improving its stability during movement. Furthermore, extending the ratchet mechanism into the cavity provides some protection for the ratchet mechanism.

[0039] Furthermore, such as Figure 4 As shown, in this embodiment, the cross-sectional shape of the perforation 53 is a rectangle adapted to the guide rack 1, and the dimension of the perforation 53 along the height direction is greater than the height dimension of the guide rack 1, so that the teeth 12 on the guide rack 1 can separate from the ratchet teeth 20 on the ratchet 2. Specifically, when using this film roll 8 unloading fixture, the guide rack 1 is positioned and fixed on the unwinding machine 9 by the positioning structure 10. The operator applies downward pressure to the drive frame 6 and the ratchet mechanism, so that the ratchet teeth 20 on the ratchet 2 in the ratchet mechanism mesh with the teeth 12 on the guide rack 1. At this time, there is a gap between the lower end face of the guide rack 1 and the lower bottom wall of the perforation 53. After the unloading of film roll 8 is completed, lifting the drive frame 6 and the ratchet mechanism will separate the ratchet 20 on the ratchet mechanism from the meshing teeth 12 on the guide rack 1. At this time, there is a gap H between the upper end face of the guide rack 1 and the upper top wall of the perforation 53. At this time, the drive frame 6, transmission frame 5 and ratchet mechanism can be manually moved in the opposite direction to the initial position for the next unloading of film roll 8.

[0040] In this embodiment, the positioning structure 10 is a positioning post with a stepped structure. The positioning post is fixed to the guide rack 1 by screws, and the positioning post is used to be inserted and positioned with the bow-shaped overhead hole in the unwinding machine 9.

[0041] In addition, in this embodiment, the positioning structure 10 is disposed at one end of the guide rack 1, and the other end of the guide rack 1 is provided with an arc-shaped pressure strip 11 that is adapted to the outer ring surface of the mandrel 80 in the film roll 8. The arc-shaped pressure strip 11 can cooperate with the mandrel 80 in the film roll 8 to limit the guide rack 1, thereby improving the stability of the guide rack 1 and preventing the guide rack 1 from rotating relative to the unwinding machine 9.

[0042] Furthermore, in this embodiment, the cross-section of the arc-shaped pressure strip 11 is circular, and the arc-shaped pressure strip 11 is semi-circular in shape. Designing the arc-shaped pressure strip 11 as semi-circular maximizes the contact area between the arc-shaped pressure strip 11 and the mandrel 80, thereby better limiting the guide rack 1. Conversely, designing the cross-section of the arc-shaped pressure strip 11 as circular minimizes the contact area between the arc-shaped pressure strip 11 and the mandrel 80, thereby reducing wear on the mandrel 80 caused by the arc-shaped pressure strip 11.

[0043] The film roll 8 unloading fixture provided in this embodiment also includes an operating handle 7, one end of which is mounted on the drive frame 6. Specifically, the operating handle 7 in this embodiment is a hollow tube structure, and a connecting shaft is provided at the upper end of the transmission frame 5. The connecting shaft is tightly fitted into the operating handle 7.

[0044] like Figure 5 As shown, when using the film roll 8 unloading fixture, the positioning pin is first inserted into the arc-shaped frame cavity in the unwinding machine 9, and the arc-shaped pressure strip 11 is pressed onto the mandrel 80 of the film roll 8. The push plate 50 on the transmission frame 5 is then attached to the end face of the mandrel 80. Afterwards, the operator pushes and swings the operating handle 7, causing the drive frame 6 to swing around the first rotating shaft 51. During this process, the drive pawl 3 drives the ratchet 2 to roll along the guide rack 1, thereby causing the transmission frame 5 to move unidirectionally along the guide rack 1. This allows the push plate 50 to push the mandrel 80 in the film roll 8 until the mandrel 80 disengages from the cone head of the air expansion shaft, completing the unloading operation of the film roll 8.

[0045] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. A film roll unloading fixture for an unwinding machine, characterized in that, The membrane roll unloading fixture includes: The guide rack is provided with a positioning structure for positioning with the unwinding machine; A ratchet mechanism configured to engage with the guide rack; A transmission frame, which is sleeved on the guide rack and has a push plate for engaging with the end of the mandrel in the film roll; and, A drive frame, which is connected to the ratchet mechanism and the transmission frame via a first rotating shaft; The drive frame is configured to drive the transmission frame to move unidirectionally along the guide rack via a ratchet mechanism under external force, so as to push the mandrel in the film roll to move via the push plate.

2. The membrane roll unloading fixture as described in claim 1, characterized in that, The ratchet mechanism includes a ratchet, a drive pawl, and a stop pawl. The ratchet is rotatably mounted on the drive frame and the transmission frame via a first rotating shaft. The drive pawl is rotatably mounted on the drive frame via a second rotating shaft. The stop pawl is rotatably mounted on the transmission frame via a third rotating shaft. The first rotating shaft, the second rotating shaft, and the third rotating shaft are arranged in parallel and spaced apart. The drive pawl is configured to drive the ratchet to rotate in a set direction under the drive of the drive frame, and the stop pawl is configured to restrict the ratchet from rotating in the opposite direction along the set direction.

3. The membrane roll unloading fixture as described in claim 2, characterized in that, The drive pawl engages with the ratchet in a one-way manner. The ratchet mechanism further includes a first elastic element, which is disposed between the drive pawl and the drive frame and applies pressure to the drive pawl so that it tends to engage with the ratchet teeth on the ratchet.

4. The membrane roll unloading fixture as described in claim 2, characterized in that, The stop pawl engages unidirectionally with the guide rack. The ratchet mechanism also includes a second elastic element, which is disposed between the stop pawl and the transmission frame and applies pressure to the stop pawl so that it tends to engage with the teeth on the guide rack.

5. The membrane roll unloading fixture as described in claim 2, characterized in that, The transmission frame includes a bottom wall and side walls disposed around the bottom wall. Two side walls along the length of the guide rack are provided with through holes, and the transmission frame is sleeved on the guide rack through the through holes. The push plate is disposed on the outer surface of the bottom wall, and the bottom wall and the side wall cooperate to form an open cavity, through which the ratchet and the stop pawl extend into the cavity.

6. The membrane roll unloading fixture as described in claim 5, characterized in that, The cross-sectional shape of the perforation is a rectangle adapted to the guide rack, and the dimension of the perforation along the height direction is greater than the height dimension of the guide rack, so as to enable the teeth on the guide rack to separate from the ratchet teeth on the ratchet.

7. The film roll unloading fixture as described in any one of claims 1 to 6, characterized in that, The positioning structure is a positioning post with a stepped structure. The positioning post is fixed to the guide rack by screws, and the positioning post is used to be inserted and positioned with the bow-shaped overhead hole in the unwinding machine.

8. The film roll unloading fixture as described in any one of claims 1 to 6, characterized in that, The positioning structure is located at one end of the guide rack, and the other end of the guide rack is provided with an arc-shaped pressure strip that matches the outer ring surface of the mandrel in the film roll.

9. The membrane roll unloading fixture as described in claim 8, characterized in that, The cross-section of the arc-shaped pressure strip is circular, and the arc-shaped pressure strip as a whole is semi-circular.

10. The film roll unloading fixture as described in any one of claims 1 to 6, characterized in that, The film roll unloading fixture also includes an operating handle, one end of which is mounted on the drive frame.

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