RU112415U1 - TEST STAND FOR VIBRATION ISOLATORS UNDER ACTION OF LOADS WITH AXIAL AND LATERAL COMPONENTS - Google Patents

Abstract

A stand for testing vibration isolators under the action of loads with axial and lateral components, containing a frame, a swinging arm, a load installed movably along the entire length of the swinging arm, rigidly connected to the frame and two vertical posts installed at its ends, the upper end of one of which is pivotally connected to the swinging arm lever, and on the other there is a trigger device, the upper support of the tested vibration isolator, the lower support of the tested vibration isolator with support legs, and the frame is made in the form of an I-beam with a horizontal wall arrangement, the swinging arm is in the form of an I-beam with a vertical wall arrangement, and the load is made in the form of a set of metal disks of different masses, characterized in that it contains two lamellar stands connected to the upper support of the vibration isolator under test and mounted vertically parallel to each other and an inclined plate pivotally connected to them, while the height h of the lamellar stand is rigidly connected d with the upper support of the vibration isolator under test, is from 5 to 50% of the height H of the plate rack connected to the upper support of the vibration isolator under test with the ability to move along it to change the angular position of the inclined plate.

Description

The utility model relates to mechanical engineering, namely to the design of stands for testing vibration isolators.

A known stand for testing shock absorbers, comprising a frame with an upper shock absorber mounting bracket fixed thereto and a swing arm, on which the load is mounted, a lower shock absorber mounting bracket and a recording device mounted between the swing arm and the frame, the swing arm being made two shoulders with a swing axis in center, and the load is mounted movably along the entire length of the swinging lever [A. 526796 USSR, MKI G01M 17/04, publ. 08/30/76, bull. No. 32].

A disadvantage of the known design of the test bench for shock absorbers is that the design does not provide for the possibility of reproduction of the loads with axial and lateral components in the shock absorber under test.

The closest in technical essence to the utility model is a stand for testing vibration isolators, comprising a frame, a swing arm, a load mounted movably along the entire length of the swing arm, and a recording device rigidly connected to the frame and two vertical posts installed at its ends, the upper end of one of which pivotally connected to a swinging lever, and the trigger and recording devices, the upper and lower supports of the tested vibration isolator with supporting legs are placed on the other [П.m. 104714 RF, MKI G01M 7/02, publ. 05/20/2011, bull. No. 14].

A disadvantage of the known design of the test bench for vibration isolators is that it does not provide for the possibility of conducting research tests of vibration isolators that determine the nature of the transformation and transfer of loads with axial and lateral components to the sprung object.

The objective of the utility model is to create a design of a test bench for vibration isolators, which makes it possible to conduct research tests of vibration isolators that determine the nature of the transformation and transmission of loads with axial and lateral components to the sprung object.

The technical result - the expansion of the possibilities of implementation during testing at the research stand of the properties of vibration isolators, which determine the nature of the transformation and transmission of loads with axial and lateral components to the object being sprung.

The specified technical result is achieved by the fact that in the test bench for vibration isolators under the action of loads with axial and lateral components containing a frame, a swinging arm mounted movably along the entire length of the swinging arm, a load rigidly connected to the frame and two vertical posts installed at its ends, the upper the end of one of which is pivotally connected to the swinging lever, and on the other there is a trigger device, the upper support of the tested vibration isolator, the lower support of the tested vibration isolator with support legs, p By the way, the frame is made in the form of an I-beam with a horizontal wall arrangement, the swinging arm is in the form of an I-beam with a vertical wall arrangement, the load is made in the form of a set of metal disks of different weights, there are two lamellae mounted vertically parallel to each other with the upper support of the tested vibration isolator struts and an inclined plate pivotally connected to them, while the height h of the plate rack, motionlessly connected with the upper support of the tested vibration isolator, is It makes up from 5 to 50% of the height H of the plate rack connected with the upper support of the tested vibration isolator with the possibility of moving along it to change the angular position of the inclined plate.

Figure 1 shows a diagram of a stand for testing vibration isolators under the action of loads with axial and lateral components, figure 2 is a beam of an I-beam profile of a swing arm with a load, figure 3 is a diagram of a device for loading a tested vibration isolator with a load with axial and lateral components, figure 4 - diagram of a device for loading the tested vibration isolator with a load with axial and lateral components, side view, figure 5 - diagram of a device for loading the tested vibration isolator with a load with axial and lateral components, type of drill hu, in Fig.6 is a diagram of a device for loading the tested vibration isolator with axial and lateral components, view along arrow A in Fig.3, Fig.7 is a diagram of the location of the strain gauges on the supporting legs of the lower support of the tested vibration isolator.

The test bench for vibration isolators under the action of loads with axial and lateral components (Fig. 1) contains a beam of an I-beam profile of a frame 1 with a horizontal wall, rigidly connected to the frame 1, a vertical strut 2 mounted at its end, the upper end of which is pivotally connected to the swing axis 3 with a swinging lever 4, made in the form of a beam of an I-beam with a vertical arrangement of the wall, load 5 mounted movably along the entire length of the swinging lever 4, rigidly connected with the frame 1 mounted on its other end ikalnaya stand 6 with the trigger device 7 placed on it, the upper support 8 of the tested vibration isolator with the device 9 for loading it with axial and lateral components, the lower 10 support of the tested vibration isolator with support legs 11, the tested vibration isolator 12 with an elastic damping element made of elastomer and bolts 13 for attaching the frame 1.

Installed movably along the entire length of the swing arm 4, the load 5 (Fig. 1 and Fig. 2) includes a set of metal disks 14 of different diameters and different heights (and, accordingly, different weights) having a central hole whose diameter is equal to the diameter of the tightening bolt 15 , the lower end of which is rigidly connected with the support 16 of the load 5, in which the holes 17 are made for its fastening by means of fasteners to the upper flange of the I-beam profile of the swing arm 4, a nut 18 is mounted on the upper end of the tightening bolt 15, fastening the set aemyh it metal disk load 5.

The tested vibration absorber 12 with an elastic damping element made of elastomer has a central hole in which a stud 19 is placed, the lower end of which is fixedly connected to the lower support 10 of the tested vibration absorber 12 with an elastic damping element made of elastomer, and a nut 20, a restrictive washer are installed on the upper end 21 and a buffer ring 22 of elastomer (figure 3).

The device 9 (Fig. 1) for loading the test vibration isolator with axial and lateral components contains associated with the upper support 8 of the test vibration isolator 12 with an elastic damping element made of elastomer, plate racks 23 and 24 mounted vertically parallel to each other (Fig. 3, Fig. four).

Due to the fact that in the upper support 8 of the tested vibration absorber 12 with an elastomer-damping element from elastomer, parallel slots 25 are made, into which fixing bolts 26 enter and have the ability to be fixed at different distances along the length of these slots (Fig. 6), it is possible to change the fixing points of the plate rack 23 on the upper support 8 of the test vibration absorber 12 with an elastic damping element of elastomer. The plate rack 24 bolts 27 is connected with the upper support 8 of the test vibration absorber 12 with an elastic damping element of elastomer without the possibility of movement.

The upper parts of the plate racks 23 and 24 are equipped with bushings 28 and 29, respectively, in which the ends of the axles 30 and 31 are mounted with rotation, the middle parts of which are mounted without rotation in the bushings 32 and 33 of the inclined plate 34 (Fig. 3, Fig. 4 5; FIG. 6). Thus, the plate racks 23 and 24 are pivotally connected to the inclined plate 34, and the plate rack 23 can be moved along the upper support 8 of the test vibration absorber 12 with an elastic damping element made of elastomer to change the angular position of the inclined plate 34.

To exclude during testing the contact of the inclined plate 34 with the stud 19, the height h of the plate rack 24 is at least one and a half times the total thickness of the nut 20, the restrictive washer 21 and the buffer ring 22 made of elastomer, and to ensure the required installation angle of the inclined plate 34, it can vary from 5 to 50% of the height H of the plate rack 23 (figure 3, figure 4).

On the surface of the lower shelf of the beam of the I-beam of the swinging lever 4, facing the test vibration absorber 12 with an elastomeric damping element of elastomer, an emphasis 35 is installed coaxially to the tested vibration isolator 12 with an elastic damping element of elastomer (Fig. 1 and Fig. 3). The end of the stop 35 in contact with the surface of the inclined plate 34 during testing is spherical in shape.

Strain gauges 36 are installed on four supporting legs 11 of the lower support 10 of the test vibration absorber 12 with an elastomeric damping element made of elastomer (Fig. 7), and strain gauges installed on two supporting legs 11 located closer to the vertical strut 2 are included in one shoulder of the strain gage, and strain gauges mounted on two support legs 11 located further from the vertical strut 2, are included in the other shoulder of the strain gage.

Vibration isolators with an elastic-damping element made of elastomer have non-linear elastic and damping characteristics, and for the same vibration isolator these characteristics under the action of axial and lateral loads can be significantly different. Under the action of loads with axial and lateral components on such vibration isolators, it is usually only experimentally possible to determine which part of the components acting on the vibration isolator is transferred to the sprung object. Therefore, when using vibration isolators with an elastic-damping element made of elastomer for suspension of elements of any design, research tests are necessary to identify the properties of vibration isolators that determine the nature of the transformation and transfer of loads with axial and lateral components to the suspension object. Such research tests can be performed on the described stand.

Stand for testing vibration isolators works as follows. Between the upper 8 and lower 10 supports of the vibration isolator, the tested vibration isolator 12 is installed with an elastic-damping element of elastomer (Fig. 1, Fig. 3). When the trigger device 7 is closed, a load 5 of a given mass is installed on the upper shelf of the I-beam of the swing arm 4 at a predetermined distance from the vertical strut 2. The mass of the load 5 is determined by the total mass of the set of metal disks constituting it. In the device 9 for loading the tested vibration isolator with a load with axial and lateral components, a predetermined angular position of the inclined plate 34 is established by moving the plate rack 23 for a predetermined distance and fixing the fixing bolts 26 in parallel slots 25 (FIG. 3, FIG. 6). The angular position of the inclined plate 34 determines the axial and lateral components of the force loading the test vibration absorber 12 with an elastic damping element of elastomer.

When the trigger device 7 is activated by the weight of the load 5, the I-beam of the swing arm 4 is rotated relative to the swing axis 3 and through the stop 35 and the device 9 for loading the test vibration absorber 12 with an elastic-damping element from an elastomer load with axial and lateral components (Fig. 1 and FIG. 3) loads the test vibration absorber 12 with an elastic damping element from an elastomer with a pulsed force with axial and lateral components. The resulting forces on the support legs 11 of the lower support 10 of the test vibration absorber 12 with an elastic damping element made of elastomer cause an imbalance in the strain gage composed of strain gauges 37 (Fig. 7). The magnitude of the imbalance determines the properties of the test vibration absorber 12 with an elastic damping element made of elastomer, which determine the nature of the transformation and transfer of loads with axial and lateral components to the sprung object.

In the next stage of the tests with a given step, the angular position of the inclined plate 34 (Fig. 3) is changed above in the manner described, and the study is repeated. Thus, the properties of the tested vibration isolator 12 with an elastic-damping element of elastomer are determined, which determine the nature of the transformation and transfer of loads to the sprung object in a wide range of ratios of their axial and lateral components.

The stand allows you to conduct the above research tests when exposed to the test vibration absorber 12 with an elastic damping element of an elastomer of different sizes of loads. To change the magnitude of the load acting on the tested vibration isolator 12 with an elastic damping element made of elastomer, the mass of the load 5 is changed by changing the total mass of the set of metal disks constituting it, or in order to change the shoulder of the action of the loading force, the load 5 is moved a predetermined distance along the length of the swinging arm 4 (FIG. 1 and FIG. 2) and its support 16 is fixed by means of fasteners on the upper flange of the I-beam profile of the beam of this lever.

Thus, due to the fact that the design of the stand includes a device for loading the tested vibration isolator with an elastic-damping element from an elastomer with a load with axial and lateral components, which allows changing the ratio of the axial and lateral components of this load, as well as due to the fact that the design the stand provides the ability to change the magnitude of the acting on the test vibration isolator with an elastic damping element from an elastomer loading force by changing the total mass of the set is load bearing metal disks or changes in the shoulder action of the loading force due to the movement of the load along the length of the swinging arm, the stand allows you to conduct research tests of vibration isolators with an elastic damping element made of elastomer, which determine the nature of the transformation and transfer of loads to the sprung object in a wide range of ratios of axial and lateral components.

Claims (1)

Test stand for vibration isolators under the action of loads with axial and lateral components, comprising a frame, a swinging arm, a load mounted movably along the entire length of the swinging arm, two vertical struts rigidly connected to the frame and installed at its ends, the upper end of which is pivotally connected to the swinging a lever, and on the other a trigger device is placed, the upper support of the tested vibration isolator, the lower support of the tested vibration isolator with support legs, and the frame is made in the form of an I-beam with horizontal arrangement of the wall, the swinging lever is in the form of an I-beam with a vertical arrangement of the wall, and the load is made in the form of a set of metal disks of different masses, characterized in that it contains two plate racks connected vertically parallel to each other and connected to the upper support of the vibration isolator and pivotally associated inclined plate, while the height h of the plate rack, motionlessly connected with the upper support of the tested vibration isolator, is from 5 to 50% of the height H plas mud rack, associated with the upper support of the tested vibration isolator with the ability to move along it to change the angular position of the inclined plate.