Blade Tensioning Structure of Thermal Cutting Device for Plastic Profiles

Abstract

The invention relates to a blade tensioning device of a plastic-profile thermal cutting device. The blade tensioning device comprises a rack, a knife rest and a blade, wherein the rack is fixed on the rack by a linear guide-rail mechanism in a liftable manner; one end of the blade is fixedly connected with the knife rest, and the other end of the blade is fixed on a sliding block; the knife rest is provided with a sliding groove matched with the sliding block; the sliding groove is arranged along the thermal-expansion lengthening direction of the blade; the blade tensioning device also comprises a sliding-block driving device, wherein the sliding-block driving device is fixed on the knife rest and can drive the sliding block to move along the thermal-expansion lengthening direction of the blade. The blade tensioning device has the advantages that since the tensioning mechanism is arranged for tensioning the blade, the cutting quality and the production efficiency can be improved, and the blade is not easily broken up and damaged, so that the production cost is reduced.

Description

technical field [0001] The invention relates to a thermal cutting device for plastic profiles, in particular to a blade tensioning structure of the thermal cutting device for plastic profiles. Background technique [0002] At present, in thermal cutting devices for plastic profiles, the blades are usually directly fixed on the cutting tool holder with screws, such a thermal cutting device for profiles is disclosed in Chinese patent ZL201320056132.7. This blade fixing method has the following disadvantages: since there are many kinds of profiles, the temperature of the blades required to cut profiles of different formulations is different; at the same time, the temperature of the required blades also needs to be properly regulated due to the different cross-sectional sizes of the profiles. Therefore, the temperature of the blade needs to be properly regulated during cutting. Due to thermal expansion and contraction of the blade, the deformation of the blade is different at d...

AI Technical Summary

Problems solved by technology

This blade fixing method has the following disadvantages: since there are many kinds of profiles, the temperature of the blades required to cut profiles of different formulations is different; at the same time, the temperature of the blades required for the different cross-sectional sizes of the profiles also needs to be properly regulated

When the blade is heated, it will expand and deform, that is, the inclination of the blade will increase, and the blade will bend and deform, resulting in uneven cutting section of the profile, affecting product quality, and the blade is prone to cracking, which increases production costs, and frequent replacement of blades also reduces production efficiency.

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