Shaft puller for rewinding products

Abstract

A shaft puller for rewinding products comprises a moving part, an electromagnet moving with the moving part is installed on the moving part, the electromagnet has a magnetic surface, the moving direction of the moving part is the direction of driving the electromagnet close to or away from the rewinding shaft of the rewinding product, when the moving part drives the electromagnet close to the rewinding shaft of the rewinding product, the magnetic surface of the electromagnet can touch and attract the rewinding shaft of the rewinding product, when the moving part drives the electromagnet away from the rewinding shaft of the rewinding product, the moving direction of the moving part is parallel to the axis of the rewinding shaft of the rewinding product. The present invention replaces the claw of the existing shaft puller with an electromagnet, and uses the electromagnet to pull out the rewinding shaft of the rewinding product, which does not require precise alignment like the claw, greatly simplifies the structure of the shaft puller, saves the time of aligning the claw with the rewinding shaft, and improves work efficiency.

Description

Technical Field

[0001] The present invention relates to a device for producing a rewound product (such as a paper roll), and more particularly to a shaft extractor for extracting a reel shaft of the rewound product from the rewound product. Background Art

[0002] When producing rewinding products (such as paper rolls), after the web material (such as paper) is wound on the rewinding shaft to a set diameter, a shaft puller is required to pull the rewinding shaft out of the rewinding product. Existing shaft pullers dedicated to rewinding products must be provided with claws, and the claws must be precisely aligned with the rewinding shaft, which not only has a complex structure but also has low efficiency. Summary of the invention

[0003] The object of the present invention is to provide a shaft puller for rewinding products, which does not need to be provided with claws.

[0004] The present invention is implemented as follows: a shaft puller for rewinding products comprises a moving part, an electromagnet is installed on the moving part and moves with the moving part, the electromagnet has a magnetic attraction surface, and the moving direction of the moving part is the direction of driving the electromagnet to approach or move away from the winding shaft of the rewinding product. When the moving part drives the electromagnet to approach the winding shaft of the rewinding product, the magnetic attraction surface of the electromagnet can touch and attract the winding shaft of the rewinding product. When the moving part drives the electromagnet to move away from the winding shaft of the rewinding product, the moving direction of the moving part is parallel to the axis of the winding shaft of the rewinding product.

[0005] In one embodiment, the electromagnet is fixed to an end of the moving member.

[0006] In one embodiment, the size of the magnetic attraction surface of the electromagnet in the up-down direction is greater than the displacement range of the moving member relative to the rewinding shaft of the rewound product in the height direction.

[0007] In one embodiment, a plurality of the electromagnets are fixed on the movable part, and the plurality of electromagnets are arranged along the height direction. The size of the magnetic surfaces of the plurality of electromagnets in the height direction is larger than the offset range of the movable part relative to the winding shaft of the rewound product in the height direction, and the gap between adjacent electromagnets is smaller than the diameter of the winding shaft of the rewound product.

[0008] The advantage of the present invention is that the claws of the existing shaft puller are replaced by electromagnets, and the reel of the rewound product is pulled out by the electromagnets. There is no need for precise alignment like the claws, which greatly simplifies the structure of the shaft puller and saves the time for aligning the claws with the reel, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the shaft puller for rewinding products according to the present invention;

[0010] Figure 2 yes Figure 1 A magnified view of part A;

[0011] Figure 3 It is a schematic diagram of the electromagnet sucking the reel of the rewound product;

[0012] Figure 4 It is another embodiment of a fixed position of the electromagnet on the moving part;

[0013] Figure 5 It is a schematic diagram of the relationship between the size of the electromagnet and the offset;

[0014] Figure 6 It is an embodiment of another layout structure of the electromagnet on the moving part.

[0015] The numbers in each figure are: moving part 1, electromagnet 2, guide rail 3, lifting frame 4, frame 5, magnetic surface 7, rewinding product 8, and rewinding shaft 9. DETAILED DESCRIPTION

[0016] Embodiment 1

[0017] See also Figure 1 The shaft puller includes a moving part 1, which is slidably connected to a guide rail 3, which is fixed on a lifting frame 4, and the lifting frame 4 is slidably connected to a frame 5. The moving part 1 is driven to slide along the guide rail 3 by a motor, a cylinder or a hydraulic cylinder installed on the lifting frame 4, thereby realizing horizontal movement of the moving part 1. The lifting frame 4 is driven to rise and fall by a motor, a cylinder or a hydraulic cylinder installed on the frame 5, thereby realizing up and down movement of the moving part 1. The sliding of the moving part 1 along the guide rail 3 and the lifting and falling of the lifting frame 4 are coordinated and controlled by the electronic control system of the shaft puller.

[0018] See also Figure 1 , Figure 2 At the end of the moving member 1, an electromagnet 2 is fixed which moves with the moving member 1, and the electromagnet 2 has a magnetic attraction surface 7. Figure 3 As shown, when the moving member 1 drives the electromagnet 2 to approach the rewinding shaft 9 of the rewound product 8, the magnetic attraction surface 7 of the electromagnet 2 can touch and attract the rewinding shaft 9 of the rewinding product. When the moving member 1 drives the electromagnet 2 away from the rewinding shaft 9 of the rewinding product 8, the moving direction of the moving member 1 is parallel to the axis of the rewinding shaft 9 of the rewinding product, so that the rewinding shaft 9 is pulled out of the rewinding product 8 by relying on the suction force of the electromagnet 2 on the rewinding shaft 9.

[0019] As another embodiment, Figure 4 As shown, the electromagnet 2 is fixed on the side of the moving part 1, rather than on the end surface of the moving part 1. The magnetic surface 7 is not limited to a plane, and can be a curved surface, such as a concave surface. Figure 3In the embodiment, the rewound product 8 is fixed by another mechanism and remains stationary, or is fixed by its own weight.

[0020] As a best embodiment, the size of the magnetic surface 7 in the vertical direction is larger than the displacement range of the moving member 1 relative to the rewinding shaft 9 of the rewound product 8 in the height direction. Figure 5 As shown, due to the mechanism movement error or the change in the diameter of the rewound product 8 and other factors, the movable part 1 has a certain offset range H in the height direction relative to the rewinding shaft 9 of the rewound product 8. Then, the size L of the magnetic surface 7 in the up-down direction should be greater than the offset range H. In this way, even if the movable part 1 is offset in the height direction relative to the rewinding shaft 9 of the rewinding product 8 due to the mechanism movement error or the change in the diameter of the rewinding product 8, as long as the movable part 1 is moved toward the rewinding product 8 along the axis direction of the rewinding product 8, the magnetic surface 7 of the electromagnet 2 will inevitably contact the rewinding shaft 9 of the rewinding product 8. In this way, there is no need to accurately control the position of the movable part 1 relative to the rewinding product 8 in the height direction, and the control system of the shaft puller can be made simpler, or even omitted. Figure 1 With the lifting frame 4 and the related driving mechanism shown, the moving part 1 only needs to move horizontally.

[0021] In another embodiment, if Figure 6 As shown, a plurality of electromagnets 2 are fixed on the moving part 1, and the plurality of electromagnets 2 are arranged in the height direction. The size N included in the height direction by the magnetic attraction surfaces 7 of the plurality of electromagnets 2 is larger than the displacement range H of the moving part 1 relative to the winding shaft 9 of the rewound product 8 in the height direction, and the gap M between adjacent electromagnets is smaller than the diameter D of the rewound product 8. In this way, even if the moving part 1 is offset in the height direction relative to the rewound shaft 9 of the rewound product 8 due to the movement error of the mechanism or the change in the diameter of the rewound product 8, as long as the moving part 1 is moved toward the rewound product 8 along the axis direction of the rewound product 8, at least one magnetic attraction surface 7 of the electromagnet 2 will contact the rewound shaft 9 of the rewound product 8. In this way, there is no need to accurately control the position of the moving part 1 relative to the rewound product 8 in the height direction, and the control system of the shaft puller can be made simpler, or even omitted. Figure 1 With the lifting frame 4 and the related driving mechanism shown, the moving part 1 only needs to move horizontally.

[0022] It should be noted that the size of the magnetic surface 7 of the electromagnet 2 can also be equal to or smaller than the end face diameter of the winding shaft 9. In this case, the relative position relationship between the magnetic surface 7 of the electromagnet 2 and the winding shaft 9 needs to be accurately controlled. For example, for rewound products of different diameters, the end face center of the winding shaft of the rewound product is controlled to remain on a constant vertical line through an encoder or other electronic control system, and then the moving part 1 is controlled to move to the corresponding height first and then move horizontally until the magnetic surface 7 of the electromagnet 2 contacts the end face of the winding shaft 9, so that the relative position relationship between the magnetic surface 7 of the electromagnet 2 and the winding shaft 9 of the rewound product can be accurately controlled.

[0023] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A shaft puller for rewinding products, comprising a moving part, characterized in that: An electromagnet is installed on the moving part and moves with the moving part. The electromagnet has a magnetic surface. The moving direction of the moving part is the direction of driving the electromagnet to approach or move away from the winding shaft of the rewinding product. When the moving part drives the electromagnet to approach the winding shaft of the rewinding product, the magnetic surface of the electromagnet can touch and attract the winding shaft of the rewinding product. When the moving part drives the electromagnet away from the winding shaft of the rewinding product, the moving direction of the moving part is parallel to the axis of the winding shaft of the rewinding product.

2. The shaft puller for rewinding products according to claim 1, characterized in that: The electromagnet is fixed on the end of the moving part, or fixed on one side of the moving part.

3. The shaft puller for rewinding products according to claim 1 or 2, characterized in that: The size of the magnetic attraction surface of the electromagnet in the up-down direction is greater than the displacement range of the moving part relative to the rewinding shaft of the rewound product in the height direction.

4. The shaft puller for rewinding products as claimed in claim 1 or 2, characterized in that: A plurality of electromagnets are fixed on the movable part, and the plurality of electromagnets are arranged along the height direction. The size of the magnetic surfaces of the plurality of electromagnets in the height direction is larger than the offset range of the movable part relative to the winding shaft of the rewound product in the height direction, and the gap between adjacent electromagnets is smaller than the diameter of the winding shaft of the rewound product.

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