RU2682845C1 - Pendulum impactor for testing material samples under shock loading - Google Patents

Abstract

FIELD: test equipment.

SUBSTANCE: invention relates to a testing technique, in particular to a pendulum impactors. Pendulum impactor contains a frame, placed on it is a pendulum in the form of a rigid rod, one end of which is pivotally connected by a turntable with a frame, an elastic element cantilever-mounted on the other end of the rod; a weight mounted on the free end of the elastic element; a sample gripper attached to the frame; and an electromagnetic lock for interaction with the rod. Pendulum impactor is additionally equipped with a rotational drive mounted on the turntable and connected to the rod, an additional sample grip, and a drummer mounted on the rod, while the electromagnetic lock is fixed on the additional grip, the drummer is made in the form of a ring of ferromagnetic material and is installed with the possibility of rotation about the axis of the rod and interaction with the electromagnetic lock, and the elastic element is made in the form of a rod of non-circular cross section.

EFFECT: increase in the volume of information by conducting research both at constant and variable stiffness of loading during tests.

1 cl, 3 dwg

Description

The invention relates to testing equipment, in particular, to pendulum copra.

Known pendulum driver for testing samples of materials by repeated impacts (RF patent 1093945, publ. 09/27/1995) containing a frame, a pendulum mounted on it with a load, a gripper for the sample mounted on the pendulum, two stops mounted on the frame, designed to interact with that mounted on a sample by a shock-transmitting element, a pendulum rotation drive in the swing plane.

The disadvantage of the copra is that it does not have any counteractive elements that allow testing under alternating and alternating loads of different sizes.

Known pendulum driver for testing samples of materials by repeated impacts (RF patent 1385021, publ. 10.12.1995), containing a frame, a pendulum mounted on it with a load, a gripper for a sample mounted on the pendulum, two stops mounted on the frame, designed to interact with mounted on a sample by a shock-transmitting element, a pendulum rotation drive in the swing plane and a pendulum rotation drive around its axis.

The disadvantage of the copra is that it does not have any counteractive elements that allow it to be tested under alternating loads with different impact forces.

Known pendulum driver for testing samples of materials under shock loading (patent SU No. 1518716, publ. 20.01.1996) containing a frame, a pendulum placed on it in the form of a rigid rod, one end of which is pivotally connected by a rotary platform to the frame, an elastic element, console mounted at the other end of the rod, a load mounted on the free end of the elastic element, a sample grip mounted on the frame.

The disadvantage of the copra is that it lacks structural elements that allow testing under alternating loading with a change in the rigidity of the load during the test.

Known pendulum driver for testing samples of materials under shock loading (patent RU No. 2051365, publ. 20.12.1995) containing a frame, a pendulum placed on it in the form of a rigid rod, one end of which is pivotally connected by a rotary platform to the frame, an elastic element, cantilever mounted at the other end of the rod, a load mounted on the free end of the elastic element, a sample grip mounted on the frame.

The disadvantage of the copra also lies in the fact that it lacks structural elements that allow testing under alternating loading with a change in the rigidity of the load during the test.

Known pendulum driver for testing samples of materials under shock loading (copyright certificate SU No. 1594377, publ. 02.20.1996), adopted for the prototype, which contains a frame, placed on it a pendulum in the form of a rigid rod, one end of which is pivotally connected by a rotary platform to the frame , an elastic element cantilevered on the other end of the rod, a load mounted on the free end of the elastic element, a sample grip mounted on the frame, and an electromagnetic lock for interacting with the rod. Koper provides research when loading a sample with damped alternating shock and static alternating loads.

The disadvantage of the copra is that it lacks structural elements that ensure research, both with constant and variable loading rigidity during testing, which limits the amount of information during research.

The technical result of the invention is to increase the amount of information by conducting research both at constant and at varying during the test rigidity of the load.

The technical result is achieved by the fact that the pile driver is additionally equipped with a rotation drive mounted on a rotary platform and connected to the rod, an additional grip for the sample, and a hammer mounted on the rod, while the electromagnetic lock is mounted on the additional handle, the hammer is made in the form of a ring of ferromagnetic material and installed with the possibility of rotation about the axis of the rod and interaction with the electromagnetic lock, and the elastic element is made in the form of a rod of non-circular cross section.

The device is illustrated by the following figure:

FIG. 1 is a general diagram of a copra,

FIG. 2 - matrix for fixing the sample, view BB in section,

FIG. 3 - elastic element, view aa in section where:

1 - bed;

2 - rod;

3 - rotary platform;

4 - an elastic element;

5 - cargo;

6 - capture;

7 - sample;

8 - electromagnetic lock;

9 - rotation drive;

10 - additional capture;

11 - drummer;

12 - drive;

13 - wheel;

14 - latch.

The pendulum driver for testing samples of materials under shock loading contains a frame 1 (Fig. 1), a pendulum placed on it in the form of a rigid rod 2, one end of which is pivotally connected by a rotary platform 3 to the bed, an elastic element 4, cantilever mounted on the other end of the rod 2 , a load 5 mounted on the free end of the elastic element, a gripper 6 (Fig. 1, 2) for the sample 7, mounted on the bed, and an electromagnetic lock 8 for interaction with the rod 2 (Fig. 1).

The pile driver is equipped with a rotation drive 9 mounted on a turntable 3 and connected to the rod 2, an additional sample gripper 10 for placement opposite to the gripper 6 (Fig. 1, 2), and a hammer 11 (Fig. 1) mounted on the rod 2. Electromagnetic the lock 8 (Fig. 1, 2) is mounted on an additional grip 10 (Fig. 1, 2). The drummer 11 is made in the form of a ring of ferromagnetic material and is mounted for rotation about the axis of the rod 2 and interact with the electromagnetic lock 8 (Fig. 1, 2). The elastic element 4 is made in the form of a rod of non-circular cross section.

The pile driver is equipped with a drive 12 (Fig. 1) with a wheel 13 for repeated rotations of the platform 3 and the rod 2, and a latch 14 for connecting the wheel 13 with the rotary platform 3.

Koper works as follows. Turn off the latch 14 and the rod 2 under the action of the load 5 is rotated until the impactor 11 with the electromagnetic lock 8. The sample 7 is loaded with a shock pulse. If the electromagnetic lock 8 is turned off, then the load 5 and the elastic element 4 create a series of repeated strokes on the sample with a damped pulse amplitude. If the rotation drive 9 is turned off, then repeated decaying strikes are applied with the same stiffness. To change the stiffness of repeated decaying pulses, turn the drive 9 and turn the rod 2 together with the elastic element 4 and the load 5 relative to the axis of the rod 2. Due to the non-circular section of the rod of the elastic element 4, the stiffness characteristic of its bending will change and the stiffness of repeated impacts will accordingly change. To create static alternating cyclic damped oscillations of the load, an electromagnetic lock 8 is turned on, which is why after impact loading of the sample, the impactor 11 is connected to the electromagnetic lock 8. Alternating elastic decaying deformations of the elastic element 4 under the action of load 5 will create corresponding alternating loads on the sample 7 with constant loading rigidity if drive 3 is off, or with variable stiffness, if drive 3 is on. When you turn off the electromagnetic lock 8 alternating static damping loads are replaced by shock damping loads of the same sign. The moments of transition from shock loads of one sign to static alternating loads are carried out during testing in accordance with the research program. To repeat the loads after their complete or partial attenuation, the drive 12 and the lock 14 are turned on, which makes the wheel 13 rotates the rod 2 to a new initial angle.

Thus, the proposed pile driver provides studies when loading a sample with decaying alternating shock and static alternating loads both at constant and variable loading rigidity during testing, which significantly increases the amount of information during research.

Claims (1)

A pendulum driver for testing samples of materials under shock loading, containing a bed, a pendulum in the form of a rigid rod placed on it, one end of which is pivotally connected by a rotary platform to the bed, an elastic element cantilevered on the other end of the rod, a load mounted on the free end of the elastic element , a grip for the sample, mounted on the bed, and an electromagnetic lock for interacting with the rod, characterized in that it is additionally equipped with a rotation drive mounted on a rotary platform the shape and connected to the rod, an additional grip for the sample and a drummer mounted on the rod, while the electromagnetic lock is fixed to the additional capture, the drummer is made in the form of a ring of ferromagnetic material and mounted for rotation about the axis of the rod and interact with the electromagnetic lock, and elastic the element is made in the form of a rod of non-circular cross section.

Images