SU922543A1 - Universal testing machine - Google Patents

Description

one

The invention relates to measurement technology and can be used to study the mechanical properties of materials.

For static and dynamic testing of materials, electrohydraulic testing machines have found wide application.

A known testing machine, comprising a power frame, a static loading drive, connected to the grippers via t11 driving screws.

However, this design requires sufficiently large movements of the moving grip during the test,

. Closest to the proposed technical entity is a universal testing machine containing a power frame, on which are located the followers of dynamic and static loading and grippers, one of which is connected with the following drive of static loading through the driving screws, and the other is rigidly fixed on a hydraulic cylinder rod of an electro-hydraulic follow-up dynamic loading drive C21.

A disadvantage of the known device is its limited operation, for example, in static and low-cycle test modes.

The purpose of the invention is the expansion

to the functionality

The goal is achieved by the fact that the following static loading drive is made in the form of two electric motors and gearboxes, each

The IS of which is connected to the hydraulic cylinder and to the corresponding gearbox associated with the respective lead screw.

The drawing shows the scheme

20 described device.

Claims (2)

On the power frame there are two electric motors 1 and 2, two gears 3 and 4, respectively, connected to gear box 5 and 6 and Hydraulic rots 4 cylinder 7. Electric motors 1 and 2, gear boxes 3 and, speed box 5 and 6, regulator 8 and setpoint 9 form an electromechanical actuator which, by rotating the spindle screws 10 and 11, moves the movable yoke 12, in which the force-measuring sensor 13 and the upper grip 1 associated with it are located. The electro-hydraulic actuator includes a hydraulic cylinder 7, the stem of which is connected to the lower grip 15, displacement sensor 16, ele A rotary hydraulic amplifier 17, a regulation regulator and a setting device 19. In grips 14 and 15, test sample 20 is installed, the elongation of which is measured using a strain gauge 21 or a resynical sensor 22. The machine is controlled with the help of regulators 8 and 18, setting operation modes 9 and 19 and switches 23-26, the device operates as follows. The motors 1 and 2 and the regulator 8 form a regulating system designed to test the slowly varying signal of the setting device E. The follower drive, consisting of the hydraulic cylinder 7 and the regulator 18, is intended to test the fast changing signal of the setting device 19. As a sensor of the system control can be applied to a strain gauge force sensor 13 or strain gauge 21 (for both systems, or displacement transducer 16 for regulator 18 and selsyn sensor 22 for regulator 8. In the first case, when a strain gauge force sensor 1 is used 3 or strain gauge 21, setpoint 9 and 19 outputs and inputs of regulators 8 and 18 are combined using switches 2 and 26. In this mode, the separation of the statics and linear signals coming from common setting device 9 and 19 is carried out in regulators 8 and 18, for which these knobs have appropriately selected frequency characteristics. In the second mode, knobs 8 and 18 with setting knobs 9 and 19 operate independently of each other, complete with displacement sensors 16 and 22. In this case, the upper displacements are independently controlled. 14 and lower He has 15 grabs. Thus, the proposed n-design of the testing machine makes it possible to drastically reduce power consumption during tests in low-cycle loading modes and programmed statics, as well as in complex loading modes with long-lasting static and short-term dynamic loading modes. The invention is Universal test, containing a power frame, on which are located the following drives of dynamic, static and static loading and grippers, one of which is connected to the following drive of static loading through the driving screws, and the other is rigidly fixed on the rod of the hydraulic cylinder of the follower dynamic loading drive, characterized in that, in order to expand its functional capabilities, the following static loading drive is made in the form of two electric motors and s, each of which is connected to a hydraulic cylinder and a corresponding gearbox unit associated with the respective spindle. Sources of information taken into account in the examination 1.Prospekt firm INSTRON, series 1250,1973. 2.Project of INSTRCN, series 1251, 1973 (prototype).