A chuck for paper tube processing

Abstract

This utility model discloses a chuck for paper tube processing, relating to clamping technology. It includes a chuck base with a polygonal boss on one side. A retainer and an expansion ring are coaxially sleeved on the outer side of the polygonal boss. Multiple rollers that can rotate relative to the retainer are evenly distributed on the retainer, with the outer wall of each roller making rolling contact with the side of the polygonal boss and the inner side of the expansion ring. A pressure cap is fixed to one side of the chuck base to axially limit the expansion ring and rollers. This utility model utilizes the centrifugal force generated by the rotation of the spindle to drive the rollers to roll outwards, causing the expansion ring to expand radially and clamp the paper tube. When the machine stops, the centrifugal force disappears, and the expansion ring elastically contracts to automatically release the paper tube. No additional power source or manual operation is required, significantly improving production efficiency and reducing structural complexity. Furthermore, the clamping force on the paper tube can be adaptively controlled by the rotation speed. The entire chuck structure is compact, without complex transmission mechanisms, has a low failure rate, and is convenient and reliable to use.

Description

Technical Field

[0001] This utility model relates to the field of paper tube fixing clamp technology, specifically a chuck for paper tube processing. Background Technology

[0002] In paper tube processing, the paper tube usually needs to be fixed in place before the drive spindle rotates it. Existing technologies typically use internal support methods to fix the paper tube, such as using a pneumatically driven air shaft to support it. However, this method requires an air source, and the air shaft needs to rotate, which complicates the connection and sealing of the air source, resulting in a complex fixture structure and inconvenience in installation and use. Therefore, we provide a chuck for paper tube processing. Utility Model Content

[0003] The purpose of this invention is to provide a chuck for paper tube processing to solve the above-mentioned problems.

[0004] This utility model can be achieved through the following technical solution: a chuck for paper tube processing, including a chuck base, a polygonal boss on one side of the chuck base, a retainer and an expansion ring coaxially sleeved on the outer side of the polygonal boss, a plurality of rollers that can rotate relative to the retainer are evenly distributed on the retainer, and the outer side wall of each roller rolls in contact with the side of the polygonal boss and the inner side of the expansion ring, and a pressure cap is fixed on one side of the chuck base to axially limit the expansion ring and the rollers.

[0005] A further technical improvement of this utility model is that, in a static natural state, the contact position between each roller and the corresponding side plane of the polygonal boss is located at its midpoint.

[0006] A further technical improvement of this utility model is that: the expansion ring has an opening and is elastic, and the inner wall of the expansion ring has a groove to prevent the roller from undergoing axial displacement.

[0007] A further technical improvement of this utility model is that the number of sides of the polygonal boss and the number of rollers are matched to each other and can be adjusted according to the size of the paper tube.

[0008] A further technical improvement of this utility model is that the outer wall of the expansion ring is provided with knurling to increase the friction between the paper tube and the expansion ring.

[0009] A further technical improvement of this utility model is that the roller rolls along the side plane of the polygonal boss towards the edge under the drive of rotational centrifugal force, forcing the expansion ring to expand radially.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. This utility model utilizes the centrifugal force generated by the rotation of the main shaft to drive the rollers to roll outward, causing the expansion ring to expand radially and clamp the paper tube; when the machine stops, the centrifugal force disappears, and the expansion ring elastically contracts to automatically release the paper tube, without the need for an additional power source or manual operation, significantly improving production efficiency, reducing structural complexity, and the clamping force on the paper tube can be adaptively controlled by the rotation speed.

[0012] 2. This utility model can quickly adapt to paper tubes of different diameters by adjusting the number of sides of the polygonal boss and the number of matching rollers, reducing the time for changing clamps and lowering equipment costs; this chuck has a compact structure, no complex transmission mechanism, low failure rate, and is convenient and reliable to use. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall structure assembly state of this utility model;

[0015] Figure 2 This is an exploded view of the overall structure of this utility model;

[0016] Figure 3 This is a cross-sectional view of the present invention.

[0017] In the figure: 1. Chuck base; 2. Expansion ring; 3. Pressure cap; 4. Cage; 5. Roller; 6. Screw; 7. Washer; 101. Polygonal boss; 102. Positioning boss; 201. Opening; 202. Groove; 401. Mounting slot. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0019] Please see Figure 1-3 As shown, a chuck for paper tube processing includes a chuck base 1 coaxially fixed on the rotating spindle of a machine tool, which serves as the main body of the chuck and functions to support, bear weight and transmit torque; a polygonal boss 101 is provided on one side of the chuck base 1, and threaded holes are evenly opened on the side of the polygonal boss 101, and a positioning boss 102 is provided on the side of the polygonal boss 101.

[0020] A retainer 4 is coaxially arranged on the outer side of the polygonal boss 101, and an expansion ring 2 is coaxially arranged on the outer periphery of the retainer 4. Multiple mounting slots 401 are evenly opened on the retainer 4, and a roller 5 is arranged in each mounting slot 401. Each roller 5 rolls between the polygonal boss 101 and the expansion ring 2.

[0021] The expansion ring 2 is specifically an elastic ring with an opening 201 and a groove 202 on its inner side. The roller 5 rolls in the groove 202 and its other side rolls into contact with the side plane of the polygonal boss 101.

[0022] A pressure cap 3 is provided on one side of the expansion ring 2. The pressure cap 3 is connected and fixed to the threaded hole on the polygonal boss 101 by a screw 6 with a washer 7, thereby completing the axial positioning of the expansion ring 2 and the roller 5.

[0023] Furthermore, the number of sides of the polygonal boss 101 can be changed according to the size of the paper tube, and the number of mounting grooves 401 and rollers 5 corresponds to the number of sides of the polygonal boss 101; the outer wall of the expansion ring 2 is provided with knurling to increase the friction between the paper tube and the expansion ring 2.

[0024] In its static, natural state, the contact position between the roller 5 and the polygonal boss 101 is the midpoint of the side surface of the polygonal boss 101.

[0025] Working principle:

[0026] In use, the entire chuck is mounted and fixed on the rotating spindle of the corresponding equipment (such as packaging machinery). Then, the paper tube is put on the expansion ring 2, and then the rotating spindle is started to drive the entire chuck to rotate.

[0027] Under the action of tension and friction, the paper tube rotates relative to the chuck, and at the same time, the cage 4 and the chuck base 1 also rotate relative to each other. The roller 5 rotates under the constraint of the expansion ring 2 and rolls along the side of the polygonal boss 101. When the roller 5 rolls from the center of the side of the polygonal boss 101 to the edge, the diameter of the circumference where the roller 5 is located increases, which drives the diameter of the expansion ring 2 to increase, thereby jamming the paper tube.

[0028] In this process, the greater the rotation speed of the main shaft, the greater the centrifugal force on the roller 5, which in turn increases the pressure on the side wall of the expansion ring 2, making the paper tube more secure and less prone to slippage.

[0029] After the work is completed, the rotating spindle stops rotating, and all the centrifugal force of the roller 5 disappears. At this time, under the elastic action of the expansion ring 2 (or by manually turning the paper tube slightly), the roller 5 returns to the center position of the side of the polygonal boss 101 of the chuck base 1, the diameter of the expansion ring 2 is reduced to its original size, and the paper tube can be taken out smoothly.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A collet for paper tube processing, characterized by, The chuck base (1) includes a polygonal boss (101) on one side. A retainer (4) and an expansion ring (2) are coaxially sleeved on the outer side of the polygonal boss (101). A plurality of rollers (5) that can rotate relative to the retainer (4) are evenly distributed on the retainer (4). The outer side wall of each roller (5) is in rolling contact with the side of the polygonal boss (101) and the inner side of the expansion ring (2). A pressure cap (3) is fixed on one side of the chuck base (1) to axially limit the expansion ring (2) and the rollers (5).

2. A chuck for paper tube processing according to claim 1, characterized in that, In its static, natural state, the contact position of each roller (5) with the corresponding side plane of the polygonal boss (101) is located at its midpoint.

3. The collet for paper tube processing according to claim 1, wherein The expansion ring (2) has an opening (201) and is elastic. The inner wall of the expansion ring (2) has a groove (202) to prevent the roller (5) from axially displacing.

4. The collet for paper tube processing according to claim 1, wherein The number of sides of the polygonal boss (101) and the number of rollers (5) are matched, and can be adjusted according to the size of the paper tube.

5. The collet for paper tube processing according to claim 1, wherein The outer wall of the expansion ring (2) is knurled.

6. The collet for paper tube processing according to claim 1, wherein The roller (5) rolls along the side plane of the polygonal boss (101) towards the edge under the drive of rotational centrifugal force, forcing the expansion ring (2) to expand radially.

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