Coaxial pressure approaching type hardness detector

Abstract

The invention discloses a coaxial pressure approaching type hardness detector which comprises a motor, a small synchronizing wheel, a synchronous belt, a displacement sensor, a rear fixing barrel, a rear bearing, a pressing rod, an end-face bearing, a large synchronizing wheel, a spring, a base, a force sensor, a front bearing, a lead-screw nut, a guide cross rod, a position detector and a guide upright rod. By the adoption of the mode of directly checking a sample by using the force sensor, and the force measurement value error caused by frictional force and the like is avoided; when the nut is fixed and axially positioned through the spring, a gap of a lead screw is eliminated, and the control precision of a pressure head is improved; moreover, due to the coaxial design of the displacement sensor, the pressure head and the lead screw, an Abbe error is avoided.

Description

technical field [0001] The invention relates to a hardness testing device for cigarette filter rods, in particular to a coaxial pressure approximation type hardness testing instrument. Background technique [0002] Cigarette / filter rod hardness tester is to test the hardness of cigarettes or filter rods by compressing samples by mechanical means, which is an indispensable means for cigarette quality control. According to the national standard, the pressure plate carrying the sample is a plane larger than 20x20mm, the indenter is a cylinder with a diameter of 12mm, and the pressure is 300gf, that is, 2.99N. This was very common in early hardness testers. In this mode, weights are usually used directly to achieve a pressure of 0.3Kg, which is stable and reliable. Due to the popularity of automatic measurement and multi-functional integration, the sample cannot be transported reliably when the sample is placed horizontally, and the mechanism is also complicated, so this mode ...

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