Improved cylinder curling machine

Abstract

The invention discloses an improved cylinder curling machine which comprises an upper mould and a lower mould, wherein an annular groove is formed in the upper surface of the lower mould. The improved cylinder curling machine is characterized in that the annular groove comprises a half U-shaped groove I and a U-shaped groove II; the half U-shaped groove I is upwards opened, and the U-shaped groove II is horizontally opened; the bottom of the half U-shaped groove I is connected with the lower side wall of the U-shaped groove II in a smooth transition way. According to the improved cylinder curling machine, PVC (Polyvinyl Chloride) of a pipe socket can be easily curled when bearing very small upper mould pressure through a unique rabbet design; the time and labor conservation and the low scrap rate are achieved; a rabbet is in a U-shaped groove structure which is horizontally opened when ascending from a bottom, and the mouth part of a PVC product can be overturned and then attached to the inner wall of the PVC product when the bottom of the rabbet is very large, so that the curling is successful.

Description

technical field [0001] The invention relates to a cylinder crimping machine. Background technique [0002] Usually, when the PVC product is curled, the upper mold needs to give the PVC product a certain amount of downward pressure, so that the mouth of the PVC product can be curled along the shape of the notch of the mold. When the ordinary U-shaped groove is used for crimping, when the mouth of the PVC product goes along the groove to the bottom, since the bottom of the ordinary U-shaped groove has a small radian, it requires a lot of pressing force of the upper mold, so that the mouth of the PVC product can go along the groove. The mouth is turned over and curled. If the radian at the bottom of the notch is increased, the mouth of the PVC product can be turned over along the notch without the need for a large force of the upper die. However, due to the excessive curvature, the mouth of the PVC product cannot Fits to the inner wall of its mouth so crimping cannot be succe...

AI Technical Summary

Problems solved by technology

If the radian at the bottom of the notch is increased, the mouth of the PVC product can be turned over along the notch without the need for a large force of the upper die. However, due to the excessive curvature, the mouth of the PVC product cannot fits to the inner wall of its mouth so that crimping cannot be successful

[0003] The PVC products on the market include cylindrical straight PVC products and round-shaped bell mouth PVC products. At present, the cylindrical crimping machines on the market can solve the crimping of straight PVC products very well, which is mainly due to the straight PVC products. The finished product can withstand a large pressure force of the upper mold. However, if the PVC product of the bell mouth is to be crimped, there is a great difficulty, because the PVC product of the bell mouth has a certain slope, and it will be under the upper mold. When the pressure is slightly larger, the PVC product of the bell mouth will bend, resulting in a small force on the mouth, so that it is difficult for the mouth to curl smoothly along the ordinary U-shaped groove when crimping

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