RU82038U1 - TEST STAND FOR POLYSTYRENE PANELS - Google Patents

Abstract

Test bench for polystyrene panels reinforced with profiled metal, containing a loading device, including an electric motor, movable and fixed supports; control and measurement system, characterized in that it includes a horizontally located power frame mounted on two supports and consisting of left, right, upper and lower beams connected by bolts, while an electromechanical drive that moves the movable support is fixed to the left beam, and clamping devices are mounted on the movable and fixed supports, the front corners of which are made rotary, the task of which is to test the panel into the loading device and fix it during the test.

Description

The utility model relates to the study of the strength properties of solid materials by applying mechanical forces to them, more specifically, to testing building structures, namely, polystyrene panels reinforced with profiled metal for long-term compression according to the programmed loading and unloading stages.

Known testing machines of type MS (design documentation of OJSC "SKBIM", TU 25-06.2091, 1984) / 1 /, intended for testing building materials for compression. These machines are hydromechanically driven. The power frame is vertical, and consists of two columns, a beam and a base. A cylinder is installed inside the base, which moves the lower movable support. The upper fixed plate is fixed to the traverse from above.

To the right of the loading device is a remote control, at the bottom of which there is a hydraulic actuator, which includes: two pumps that rotate the engine; distributor, speed controller, controlled from control knobs. At the top of the console are a torsion force meter, which includes a dial, a cylinder block, a torsion bar twisting through a lever, and a spool valve. Through a system of blocks, a rotating torsion bar is connected to an arrow on the scale.

Pumps rotating from the engine take the working fluid out of the tank and feed the working fluid through the pipelines to the cylinder, which, moving upward and developing a force, compresses the test object. Kinematically related to spinning torsion bar

the arrow on the scale, turning, shows the magnitude of the current load.

Machines of this type do not allow testing of polystyrene panels due to the fact that:

- hydromechanical drive does not provide step control;

- small height and width of the working space;

- the vertical arrangement of the frame complicates the loading of panels;

- the hydraulic drive needs periodic replacement of the working fluid.

Closest to the proposed are the PR-500 and PR-1000 presses (design documentation of SKBIM OJSC, TU 25-06.1394, 1977) / 2 /, the height of the working space of which allows testing structural building elements in vertical position for compression. The loading devices of these presses are a frame consisting of vertical columns that are fixed to the base. At the base is a hydraulic cylinder, driven by a hydraulic actuator. At the end of the plunger of the hydraulic cylinder there is a movable plate. The upper part of the columns is connected by a movable traverse with an upper plate fixed to it. The movable traverse is able to move up and down using an electromechanical drive, changing the height of the working space.

The disadvantage of the design of the above press is:

- a large height of the loading device, which requires the placement of the test machine in a room with a ceiling height of more than five meters;

- inconvenience of loading panels in an upright position;

- complication of machine maintenance due to the presence of hydraulic drive.

The purpose of the claimed utility model is to create a test bench for polystyrene panels with simplicity of design and ease of maintenance.

This goal is achieved by the fact that in the test bench for panels made of polystyrene reinforced with profiled metal, containing a loading device, including an electric motor, movable and fixed supports; control and measurement system, included is a horizontally located power frame mounted on two supports and consisting of left, right, upper and lower beams connected by bolts, while an electromechanical drive that moves the movable support is fixed to the left beam, and mounted on the movable and fixed supports clamping devices, the front corners of which are made rotatable, whose task is to access the test panel to the loading device and fixation during the test.

The inventive test bench is shown in Fig. 1 and 2.

The power frame located horizontally consists of left 1, right 2, upper 3 and lower 4 beams connected by bolts. An electromechanical drive is mounted on the left beam 1, consisting of an electric motor 5, which drives the worm 6 of the worm gear 7. The ball screw pair 9 is fixed in the hole along the axis of the worm wheel 8, which turns the rotational motion into translational motion. The end face of the screw through a cylindrical hinge 10 is connected to a movable support 11, which rolls on 4 bearings, keeping the direction of movement. Fixed support 12 is fixed to the right beam 2 using two force sensors 13.

On movable 11 and fixed 12 supports mounted clamping device 14, driven by removable handles. The front corners of the clamping device have the ability to manually rotate in a vertical axis, which ensures the installation of subjects

panels. The power frame is fixed to two stands 15, allowing it to be stable on the floor. A displacement sensor is mounted on the loading device. The cabinet contains a computer control and measurement system.

The work of the test bench is as follows.

The front clamping devices 14 are rotated through 180 ° to allow the test panel to access the loading device. The test panel is mounted on the movable 11 and fixed 12 supports and is fixed. The test program starts. The actuator of the machine is an electric motor 5, which, on command of the control system, rotates the worm 6 of the worm gear 7. The worm 6, being in mesh with the worm wheel 8, rotates it. A ball screw pair converts the rotational movement of the worm wheel 8 and the housing fixed to it into the translational motion of a ball screw pair attached to the movable support 11. Moving, the movable support 11 abuts against the test panel, compresses it.

The magnitude of the applied loads are recorded by force sensors 13.

The displacement sensor allows the control system in constructing a force – strain diagram.

The proposed design of the test bench for polystyrene panels has advantages over the principles of construction and testing of these analogues.

A horizontally positioned power frame and rotary clamping devices provide easy loading of the test panels. The low height of the loading device (1.6 meters) provides convenience in placing the testing machine and maintenance, and replacing the hydraulic actuator with an electromechanical one simplifies machine maintenance.

The inventive design is expected to be used in the design and manufacture of a test bench for panels made of SIP-200 polystyrene.

Used sources:

1. Testing machines of type MS (design documentation of OJSC SKBIM, TU 25-06.2091, 1984).

2. Test presses of the type PR-500 and PR-1000 (design documentation of OJSC SKBIM, TU 25-06.1394, 1977).

Claims (1)

Test bench for polystyrene panels reinforced with profiled metal, containing a loading device, including an electric motor, movable and fixed supports; control and measurement system, characterized in that it includes a horizontally located power frame mounted on two supports and consisting of left, right, upper and lower beams connected by bolts, while an electromechanical drive that moves the movable support is fixed to the left beam, and clamping devices are mounted on the movable and fixed supports, the front corners of which are made rotary, the task of which is to test the panel into the loading device and fix it during the test.