Anti-skid self-tightening type end expansion shaft

Abstract

The invention relates to an anti-skid self-tightening end expansion shaft, which relates to products in the mechanical industry, mainly comprises an expansion core body 1, a positioning screw 2, an elastic rubber ring 3, a nut cover 4, a shell 5, an expansion block 6, a pressure-bearing disc 7, a handle 8 and a sleeve 9, and is characterized in that one end of the shell is provided with an external thread; the sleeve, the nut cover and the elastic rubber ring jointly form a combined body with the adjustable axial length, after the combined body is installed between the expansion core body and the pressure bearing disc and is adjusted, static friction torque can be generated on the two sides of the combined body to prevent the shell from rotating when the shell is subjected to the action of torsional torque, and the sleeve cannot slip as long as the shell does not rotate. Therefore, the self-tightening type end expansion shaft is called as an anti-skidding self-tightening type end expansion shaft.

Description

Technical Field This invention relates to an improvement on the self-tightening end expansion shaft for products in the machinery industry. Background Technology See attached image. Figure 1 This is a simplified structural diagram of a current self-tightening end-expansion shaft. Figure 2 yes Figure 1 The cross-sectional view of side AA shows: 1-expansion core body, 2-outer shell, 3-expansion block, 4-sleeve, 5-strip material. This end expansion shaft is used in pairs and is mounted on supports on both sides of the coiler, with the expanded sleeve sandwiched in between. The end expansion shaft shown is the one facing the left side of the coiler in the direction the roll is being wound. Using this as an example, we can understand its expansion process and existing problems. After the expansion core body is driven by a torque of magnitude M, a tension of magnitude N is simultaneously generated on the wound strip. Through the combined action of both, the expansion block is forced to expand, thereby tightening the sleeve and the wound strip. The greater the tension of the material, the tighter the sleeve is stretched. If the tension of the wound material remains constant, the larger the diameter of the roll, the tighter the sleeve is stretched. Therefore, it is called a self-tightening type. It works well when the tension of the material does not fluctuate much. However, if the tension of the material fluctuates too much, especially when stopping midway, the sleeve will slip when the material loses tension and the roll shakes. Once it slips, the inner wall of the sleeve will be scratched. For paper sleeves that are widely used today, it is difficult to tighten them again after the inner wall is scratched. How to prevent the sleeve from slipping when the material loses tension becomes a problem. Summary of the Invention The purpose of this invention is to provide a self-tightening end expansion shaft with anti-slip properties. It mainly consists of an expansion core body, a positioning screw, an elastic rubber ring, a nut cap, a housing, an expansion block, and a pressure plate. Its key feature is that one end of the housing has an external thread, which mates with the internal thread of the nut cap. Together with the elastic rubber ring, they form an assembly. This assembly is then fitted onto the expansion core body, and the pressure plate is installed. The maximum static friction torque on both sides of the assembly can be adjusted by rotating the nut cap, and then locked with the positioning screw. By adjusting the sum of the maximum static friction torques of the two end expansion shafts installed on both sides of the winding machine to be greater than the maximum torque generated when the maximum diameter roll material wobbles, roll material wobbling can be prevented, thus preventing sleeve slippage.

[0004] The technical solution adopted by the present invention to solve the technical problem is as follows: a self-tightening end expansion shaft with anti-slip properties is mainly composed of an expansion core body, a positioning screw, an elastic rubber ring, a nut cover, a shell, an expansion block, and a pressure plate. Its feature is that one end of the shell has an external thread, which together with the nut cover and the elastic rubber ring forms an assembly with an adjustable axial length. After the assembly is installed between the expansion core body and the pressure plate and adjusted, when the shell is subjected to a torsional torque, static friction torque will be generated on both sides of the assembly to prevent the shell from rotating.

[0005] The beneficial effects of this invention are as follows: by using an expansion core body, positioning screws, elastic rubber rings, nut caps, outer shell, expansion blocks, and pressure plates with the above-mentioned features to form a self-tightening end expansion shaft that can prevent slippage, after adjusting the maximum static friction torque of this type of end expansion shaft installed at both ends of the sleeve according to the actual working conditions during winding, if the strip loses tension during winding, the sleeve will generally not slip. If the tension is too high, it will be in a self-tightening state, and the sleeve will not slip. This is of great practical significance for the paper sleeves that are widely used today. Attached Figure Description Appendix Figure 1 This is a simplified structural diagram of the current self-tightening end expansion shaft.

[0007] Appendix Figure 2 It is attached Figure 1 A cross-sectional view of plane AA.

[0008] Appendix Figure 3 This is a simplified structural diagram of the present invention.

[0009] Appendix Figure 4 It is attached Figure 3 A cross-sectional view of plane AA. Detailed Implementation Appendix Figure 3 , Attachment Figure 4 This is a preferred embodiment of the present invention. In the figure: 1-expansion core body, 2-positioning screw, 3-elastic rubber ring, 4-nut cover, 5-outer shell, 6-expansion block, 7-pressure plate, 8-handle, 9-sleeve. The self-tightening end expansion shaft of the present invention shown in the figure is one facing the left side of the winding machine in the direction of the coil being wound. The static friction torque that prevents the outer shell from rotating is adjusted by the following operation: without the sleeve, press the handle. Figure 4Turning the nut cap clockwise as shown will cause it to rotate clockwise along with the outer casing, forcing the expansion block to expand. When the expansion block reaches its limit and stops expanding, continue turning the nut cap. The nut cap will then move further away from the outer casing through the threaded action, compressing the elastic ring and generating increasing pressure on the inner surface of the expansion core and the pressure plate. When the maximum static friction torque generated by this pressure exceeds half the maximum torque generated by the swaying of the largest diameter roll, stop turning and lock it with the positioning screw. Of course, this is a theoretical calculation; in actual operation, the pressure should be adjusted to be as high as possible. Then, turn the nut cap counterclockwise with the handle. At this time, the outer shell will also rotate, and the expansion block will begin to contract. You can feel the frictional resistance through the handle. Stop turning when the expansion block contracts to the lowest position. The adjustment of the left side is now complete. Adjust the right side in the same way. Finally, put on the sleeve and insert the handle into the nut cap again. Continue to turn the left side counterclockwise and apply force to make the expansion block expand again and tighten the sleeve. Continue to turn the right side clockwise and apply force to make the expansion block expand again and tighten the sleeve. The sleeve tightened in this way will generally not slip when the wound strip loses tension.

Claims

1. A self-tightening end-end expansion shaft with anti-slip properties, mainly composed of an expansion core body, a positioning screw, an elastic rubber ring, a nut cover, a housing, an expansion block, and a pressure plate, characterized in that: One end of the outer shell has an external thread, which together with the nut cap and elastic rubber ring forms an assembly with an adjustable axial length. After the assembly is installed between the expansion core body and the pressure plate and adjusted, static friction torque will be generated on both sides of the assembly to prevent the outer shell from rotating when the outer shell is subjected to torsional torque.

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