SU379877A1 - SAMPLE TESTING MACHINE - Google Patents

Description

one

Known machine For testing samples, for example, wood for compression, including a frame on which a carriage with rotary m deforming lever mounted on the shaft is installed, does not provide the machine with high loading rates and study the elastic recovery of test samples.

The purpose of the invention is to ensure the operation of the machine at elevated loading rates and to investigate the universal restoration of the test specimens.

For this, the frame is made with a sliding stop in contact with a deforming lever, made with a turn stop and having cutting edges in the lower part, with which the deforming lever enters between cutting plastiami with a restrictive insert, mounted on the carriage and adjustable in height.

FIG. 1 shows the proposed machine, a general view; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along BB in FIG. one.

The deforming lever / is fixed on the axis 2, rests on the limiting insert 3 of the cutting plates 4 and is held in a raised position with the help of a strip 5 and screws 6 screwed into the cutting plates 4. A hammer is fixed on the lever of the deforming working body 7 opposite the test piece 7

8. The deforming lever / with the axis 2 clamped in the support posts I and the cutting plates 4 are mounted on the carriage 10 moving by means of the traction chains // along the guides 12.

The cutting plates 4 can slide up and down along the thrust pillars 13 and secured in a fixed position with the help of stop screws 14.

The contact part of the lever, / which is in contact with the restrictive insert 3, is made in the form of a cutting plate 15. A lever 16 is mounted on the lever, unwinding when the lever is turned into the stop 17 of its rotation.

On the frame 18 of the test gear opposite the lever / set the stop 19 in the form of a screw.

The paiMe also holds the cross member 20 with the holders 21, in which the test sample 7 is held by the rollers 22 pushed by screws 23, the suppressive force from the hammer 8 through the plate 24 is transferred to the test sample and perceived by the spherical support 25 under the end of the sample transverse 20 and force sensors 26 are transmitted to frame 18.

The plate 24 is connected to the rods 27, in turn, associated with a displacement sensor (not shown in the drawings). The support posts 9 UN of the lever are attached to the top plate 28 of the trolley with bolts and nuts 29. A shock absorber 30 is mounted along the path of the carriage 10. The machine operates as follows. The carriage W with the deforming lever / set in the extreme rear position. Raise the lever / and fix its IB working position with the restrictive insert 5 and the screws 6. The maximum compressive force is adjusted, the diameter and material of the restrictive insert are selected, as well as the position of the cutting plates along the height of the thrust posts 13. Sections can be taken as the restrictive insert. soft steel wire. The test specimen is secured in the holders with the help of rollers 22 and screws 23. A plate 24 with rods 27 is brought tightly to the specimen tip to restrict the linear strain of the compression stop to the required position 19 using a thread. The power supply of the electric sensors of force and displacement is turned on, the engine is started up, and at the appropriate speed the deforming working body together with the carriage advances on the test specimen. By hammer 8, the sample is deformed. When the maximum compressive force is reached or when the linear deformation limit is reached, i.e. when the lever / s meets the stop 19, the cutting edges of the lever cut the limiting insert S, extending between the cutting plates 4, the lever turns about its axis to the rear position (Fig. .1 clockwise) until the pin touches the 16 € limiter 17 turns and comes along with the trolley under the holders and the sample. After cessation of compression deformation, the test specimen is restored as a result of the action of internal elastic forces and moves the plate 24 with co-arms in the opposite direction. In this case, the electrical signals of the force and displacement sensors, both during the compression of the sample and during its elastically, m recovery, are recorded with an oscilloscope. The subject of the invention is a machine for testing samples, for example, wood for compression, including a frame on which a carriage with a rotatable deforming lever mounted on a shaft is installed, characterized in that with the aim of ensuring that the maschine works at increased loading rates and to investigate restoration of the test specimens, the frame is made with a sliding stop in contact with a deforming lever, made with a rotation stop and having cutting edges in the lower part, with which the deforming lever enters I am waiting for cutting plates with a restrictive insert, mounted on a carriage and adjustable in height.

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