SU1545144A1 - Device for testing bast fibres - Google Patents

Abstract

The invention relates to a testing technique and can be used to test bast fiber. The purpose of the invention is to improve accuracy. The device comprises two parallel bases 1 with guides fixed on them. On bases 1 at a sharp angle to the guides, plates 5 are fixed with different displacement of the edges in each pair relative to each other. A carriage 6 is mounted on the guides with a clamp 7 for fastening the end of the sample 8 of the fiber. A ruler 9 is fastened on one of the guides, and a pointer 10 is fixed on the carriage 6. The carriage 6 is kinematically connected with the drive and the clamp 7 is connected with the tension sensor of the sample 8. The latter is fixed with the tip in the clamp 7, and the load is suspended to the other end 11. When moving the carriage 6 with the clamp 7 along the guides, the fiber sample 8 interacts with the edges of the plates 5. As the displacement of the edges of the plates 5 increases relative to each other, the flow of the sample 8 increases, and placing the plates at an angle and with different displacements of the edges of the plates 5 providesmoving the sample 8 relative to the edges of the plates 5 in the longitudinal and transverse direction, which improves the accuracy of the test. 3 ill., 1 tab.

Description

+ + -4- + + 4- ++ ± 4- 4-4- -И- -М

eight

/

FI.1

The invention relates to testing equipment, in particular to devices for testing of labial fiber.

The purpose of the invention is to improve accuracy by ensuring that the fiber moves relative to the edges of the plates in the longitudinal and transverse directions.

Figure 1 shows the scheme of aggravation; figure 2 is a view of And figure 1; on fig.Z - section bb in figure 1. i The device for testing the labial Yolok contains two parallel bases 1 and 2 and guides 3 and 4 rigidly connected with them. On bases 1 and 2, at acute angles to the guides 3 and 4, pairs of the base 5 are placed, the latter are installed with an offset of the edges of one another, so that on one side of the guides 3 and 4 between the edges of the plates 5 there is - 4 a gap, and along the length of the guides 3 and 4 the edges of the plates 5 overlap C1 one another with increasing greatness displacement. On the guides 3 and 4, a carriage 6 is installed with a clamp .7 fastened on it .7 to fasten the end of the sample 8 of the fiber.

On one of the guide pins there is a measuring bar 9, and on the carriage 6 there is a pointer 10 to move the clamp 7. The carriage 6 is kinematically connected with a drive (not shown) of the carriage 6 on the guides 3 and 4, and the device is equipped with a sensor (not shown) to determine fiber tension. 81 electrically coupled to the movement movement of the carriage 6.

The device works as follows.

Sample 8 fibers, depending on the test conditions, are fastened with one of the ends in clamp 7, the free end of the sample 8 is placed between the bases 1 and 2 and the plates 5 in the gap between the latter and fixed on the free end of the sample 8, the load 1 is then driven Moving the carriage b with the clamp 7 along the guides 3 and 4. When the α-clamp is moved 7 due to friction forces, the fiber sample 8 takes a certain inclined position and begins to move along the edges of the plates 5. Since the edges of the plates 5 are located

wives with different displacements relative to each other, tension on the sample 8 of the fiber as it moves relative to the plates 5 increases. At the same time, the condition of moving sample 8 relative to the plates 5

0

five

0

five

0

five

0

five

0

five

determined by the ratio of 90 °,

(+

where o is the angle of inclination of the plates. guides; p is the angle of friction between the fiber and the plate material.

The tension of the fiber sample 8 is greater, the lower the flexibility of the fiber, i.e. the tension depends on the magnitude of the displacement of the edges of the plates 5, relative to each other, related to the sum of the angles of coverage of the sample 8 edges of the plates 5 and on the flexibility of the fiber.

Thus, upon further movement of the clamp 7, the fiber sample 8 is moved relative to the edges of the plates 5 both in the longitudinal and transverse directions, and the angle of the fiber of the edges of the plates 5 at a certain position of the clamp 7 provides tension to the sample 8, equal to breaking force. When this happens, the sample 8 is ruptured, as a result of which the sensor turns off the drive for moving the carriage 6. According to the indicator 10 on the ruler 9, the distance is determined for the movement of the carriage 6 to the destruction of the sample 8, which characterizes the flexibility and breaking strength of the fiber.

PRI im p Device parameters: length 3180 mm, width 420 mm, height 510 mm, number of edges 60 pieces, number of edges adjoining to the fiber sample 12 pieces, depth of the edges at the beginning of installation

- 2 (gap), and at the end of the installation + 12.

18 batches of hemp fibers are prepared, having different values of flexibility and breaking load. For each batch of fibers, its flexibility and breaking load are determined. For this purpose, samples of fibers weighing one gram each and 50 cm long are taken from the batches. The fiber sample is fixed at one end into a clamp. A constant weight of 42 g is attached to the other end, ensuring a constant initial tension of the specimen. Free end, taut, weight n

5154

42 g are pulled over two rows of edges, which as the sample is pulled, gradually move relative to each other. At a certain moment, at a certain value of the magnitude of the displacement of the edges of one row with respect to the other, the sample breaks.

Test data are given in the table.

Claims (1)

Thus, installing the plates at an acute angle to the guides with different displacement of the edges of the plates in each pair relative to the other provides an increase in the accuracy of the test. Invention Formula Device for testing bast fiber, containing two parallel the bases are arranged in pairs with plates, mounted with the edges of the plates displaced one against the other and designed to interact with the fiber, a clip for fastening one end of the fiber and a drive, characterized in that, in order to improve the accuracy by ensuring the fiber moves relative to the edges of the plates in the longitudinal and transverse directions, the device is equipped with guides rigidly connected to the bases and a carriage mounted on them, the drive is kinematically connected with the carriage, the clip is fixed on aretke and plates are mounted at an acute angle to the axis of the guide with a different offset in each pair.