DE102011102443A1 - Shock testing stand for checking protection of loads during transportation, has horizontal rails connected with each other at distance by cross beams and secured together with cross beams to form transportable unit - Google Patents

Abstract

The stand has two horizontal rails (1, 2) arranged parallel to each other to guide a rolling carriage (5). A load security testing loading unit is fastened on a top face of the carriage. A trolley is driven against a crash surface (9). The rails are connected with each other at distance by cross beams (3a-3c), and are secured together with the cross beams to form a transportable unit. The trolley is movable on the transportable unit. A moving drive of the carriage includes a pneumatic or hydraulic cylinder-piston unit that is arranged below a rolling carriage platform (4). The rails are in a U-shaped cross-section. An independent claim is also included for a method for operating a shock testing stand.

Description

The invention relates to a shock tester with a guided on two mutually parallel horizontal rails trolley, on the top of which is to be tested for their cargo safety loading unit fastened and driven driven against an impact surface.

To check the securing of cargoes in traffic, it is known to perform the physical movement forces occurring during transport on a large-scale stationary Stoßprüfanlage. Here, a loading unit is mounted on a trolley, which is driven on sloping or horizontal rails against a collision surface. These known local Stoßprüfanlagen have considerable external dimensions and are therefore not transportable. Rather, the load units to be tested must be brought to the system.

The object of the invention is to provide a shock tester, which is transportable on the one hand and in particular achieves exact measurement results.

This object is achieved in that the rails are fixed by cross members, in particular transverse profiles to each other at a distance and the rails together with the transverse parts form a transportable unit on which the trolley is movable.

Such a shock tester can be brought to customers without much effort due to its small external dimensions to check there on site, the load securing the load units.

Particularly small external dimensions arise when the trolley moving drive has a pneumatic or hydraulic cylinder-piston unit, which is mounted below the freight carrying trolley platform parallel to the rails. It is also advantageous if the cylinder-piston unit is arranged at the level of the wheels of the trolley.

An advantageous method for operating such a shock tester is that in the cylinder-piston unit, the fluid is pressed with such a flow that the trolley reaches a speed just before the impact surface, the predetermined negative impact on the impact surface of the trolley Acceleration generated on the charge. As a result, the desired G-force, d. H. the required load (negative acceleration) can be selected or adjusted in advance so that very accurate test results can be achieved.

An embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it

1 a perspective view of the impact tester,

2 a top view of the impact tester,

3 a first side view of the impact tester,

4 a second side view of the impact tester.

The shock tester has two mutually parallel, a distance forming, in cross-section U-shaped rails 1 . 2 on top of each other by crosspieces 3 (Cross sections) are attached, so that the crosspieces attached to both ends of the rail 3a and 3b with the two rails 1 . 2 form a rectangular frame. On the rails runs an upper plate 4 forming trolley 5 with his four wheels 6 , This is on both sides of the platform 4 and thus at the four corners of the trolley protruding down four projections 7 as guides in front, the sides of the rails 1 . 2 overtop. The lower ends of the projections 7 are angled inwards and protrude into the laterally arranged intermediate space of the U-profiles of the rails.

The trolley 5 is through a cylinder-piston unit 8th moves, which is preferably applied pneumatically. It can alternatively be hydraulically operated. The cylinder-piston unit 8th is in the middle between the two rails 1 . 2 parallel to these below the trolley 5 at the height of the wheels 6 arranged, one end of the cylinder-piston unit on the cross member 3b and the other end at the bottom of the trolley 5 especially in the middle or the transverse part 2 B fixed away from the area. By this arrangement of the cylinder-piston unit in which the cylinder-piston unit is covered by the trolley, a particularly small length of the shock tester is achieved.

Next to the crosspiece 3a is at a distance a third cross section 3c parallel between the rails 1 . 2 attached and on the two transverse parts 3a . 3c is a shock absorber 9 attached as impact surface (buffer) on which the trolley 5 accumulates after the trolley through the cylinder-piston unit 8th was accelerated to the desired speed. When driving on the shock absorber 9 the trolley is suddenly braked strongly, so that on the trolley and on the trolley mounted (not shown) loading unit a g-force is exerted, which depends on the acceleration, which was caused by the cylinder-piston unit on the trolley , Preferably, this g-force is between 0.5 and 4 g.

Thus, by selecting the acceleration exerted by the cylinder-piston unit on the trolley exactly the negative acceleration can be determined with which the trolley and the loading unit are decelerated. This makes it possible to check the charge securing the charge very accurately.

Claims (4)

Impact test bench with a horizontal rail (parallel to each other) 1 . 2 ) guided carts ( 5 ), on the upper side of which the loading unit to be checked for its cargo security can be fastened and which is driven against an impact surface ( 9 ), characterized in that the rails ( 1 . 2 ) by cross members ( 3a . 3b ) in particular transverse profiles are fixed to each other in the distance and the rails together with the transverse parts form a transportable unit on which the trolley ( 5 ) is movable. Impact test rig according to claim 1, characterized in that the trolley ( 5 ) moving drive a pneumatic or hydraulic cylinder-piston unit ( 8th ) below the cargo carrying trolley platform ( 4 ) parallel to the rails ( 1 . 2 ) is attached. Impact test stand according to claim 2, characterized in that the cylinder-piston unit ( 8th ) at the level of the wheels ( 6 ) of the trolley ( 5 ) is arranged. Method for operating a shock test stand according to one of the preceding claims, characterized in that in the cylinder-piston unit ( 8th ) the fluid is pressed in with such a volume flow that the trolley ( 5 ) just before the impact surface ( 9 ) reaches a speed that produces the predetermined negative acceleration on the load as the trolley impacts the impact surface.

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