DD151504A1 - CRASH DISC UNIT WITH CURVE DISC DRIVE - Google Patents

Abstract

The invention relates to a shock tester in which depending from the specimen mass and the impact velocity, the impact shape changeable and the shock acceleration and the rush hour adjustable are. The aim of the invention is to test each one specifically ■ Required impact velocity due to a cam drive to reach with adjustable drop height. The device has an anvil arranged in the impact surface an interchangeable spring element sist and a worktable above the anvil, the is attached to a guided frame, wherein the frame via a Fulcrum is connected to a movably arranged lever on whose underside at a distance from the fulcrum a drain roller on a cam is seated, is arranged. The shock tester is used for the stimulation of shock-like stresses, as on Machine tools, during transport of equipment, by rail joints and road bumps or in flight · * and military engineering; occur.

Description

2 1843 - 4-

Impact tester with cam drive

Field of application of the invention

The field of application of the invention extends to a shock tester with cam drive for the simulation of shock loads, as they occur on machine tools, the transport of equipment, by rail joints and road bumps or in the plug and military technology.

As a special field of application come into consideration shock testers in which, depending on the test specimen mass and the impact velocity, the impact shape changeable and the shock acceleration and the peak time are adjustable.

Characteristic of the known technical solution

It is known that the impact acceleration and the impact time of an impact shock generated by the impact of a specific specimen mass on a spring system with specific spring characteristic, the falling specimen mass, the impact velocity and the spring hardness, the impact velocity of a. Parameter for the performance of a shock tester is.

From DE-OS 22 02 612, <i 01M 7/00 it is known that in Stoßprüfgeräten with cam drive the worktable with the test specimen directly by a

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Cam is raised and released at top dead center for free fall on an anvil fitted with a spring element »

When lifting the clamping table spring packages are stretched, which impact-enhancing effect during free fall.

The amplification factor of the spring packs can be adjusted continuously during the operating state by changing the residual stress.

By replacing or changing the spring element on the anvil, the shape and time of impact can be influenced *

is disadvantageous, that in known Stoßprüfgeräten with cam drive the drop height, which is necessary to produce the required impact velocity is limited by the top dead center of the cam and the anvil depending on the thickness of the inserted spring element and thus the experimental procedures of impact tests are limited which reduces the efficiency and the possibilities of use of the impact testers.

Object of the invention

The aim of the invention is that with the cam drive each trial specific necessary impact velocity is achieved *

Explanation of the essence of the invention

The defect described in the characteristic of the known technical solution can be traced back to the cause.

30 'The principle of operation of the known cam drives allows no trial-specific adjustment

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the height of fall.

In order to eliminate the defect and its cause, the invention has the object to provide a cam drive with adjustable adjustable drop height.

Eri'indungsgemäß this is achieved in that in a recess of the impact surface designed as a housing for the shock tester anvil over the impact surface protruding spring element is arranged.

A worktable located above the anvil is attached to a guided frame which is connected via a pivot point to a movably arranged lever.

At the bottom of the lever, a discharge roller is arranged in the formerly spaced from the pivot point, which rests on a cam, which is adjustable with a height adjustment of the cam on the lever and the frame between worktable and anvil.

The arranged in the impact surface of the anvil spring element is interchangeable, so that depending on shock shape and peak time, a corresponding spring element can be inserted. "Since the spring elements can have different thicknesses, to achieve a consistent projecting height over the impact surface of the anvil, use corresponding rigid spacers as a base · The movement, such as lifting and free fall of the worktable according to the shape and the height adjustment the cam determined by the cam drive

 'When the worktable is lifted, the cam deflects.

the lever and raises the frame and thus the worktable.

Immediately after passing over the top dead center, the clamping table falls in free Pail to generate the impact on the anvil equipped with the spring element *

Embodiment. · '.

The invention will be described in detail with reference to an embodiment shown in the drawing.

The drawing shows an embodiment of a cam disk drive according to the invention for impact testers. In a recess of the impact surface of an anvil 1 designed as a housing for the cam disk drive, a spring element 2 standing above the impact surface and corresponding to the impact shape and peak time to be achieved is arranged. An overlying worktable 3 is connected via frames with a movably arranged lever 5.

A on the housing inner wall and at a relatively small distance from the worktable 3 on the frame 4 movably arranged Pührungshebel 6 and the lever 5, .einerseits on the free end of the frame 4 and on the other hand arranged on the inner housing are guide elements for the worktable third

On the underside of the lever 5, a discharge roller 8 is fixed at a distance from the pivot point 7, which rolls on a height-adjustably arranged cam 9.

Furthermore, at the free end of a Federhalte-. tion 10 secured with spring 11, the voltage to be reached by an adjusting device 12 is adjustable.

About the drain roller 8, the lever 5 is deflected according to the shape of the cam 9, so that the • frame 4 »guided by lever 5 and guide lever 6 raises the clamping table 3, wherein the spring 11 is tensioned.

Immediately after passing over the top dead center of the chuck table 3 id free fall, the spring 11 impact reinforcing acts on the spring element 2. By height adjustment 13 is in the top dead center the drop height of the chuck table 3 of cam 9 via discharge roller 8, lever 5 and Frame 4 adjustable.

An impairment of the drop height and thus the impact velocity through the trial-specific different thicknesses of the spring elements 2 is thus excluded.

In addition, the drop height is independent of the thickness of the spring elements 2 adjustable by a constant protruding height of the different spring elements 2 on the impact surface of the anvil 1 is achieved in that a balancing rigid spacer 14 is disposed in each case under the spring element 2 in the recess.

Claims (4)

Invention s claim "1. SioBprüfgerät with cam drive, in which the worktable mi-t the specimen is lifted before each impact to be executed by means of cam, characterized in that in a recess of the impact surface designed as a housing for the impact tester anvil (1) over the impact surface protruding Spring element 2 is arranged and an overlying Aufgespanntisch (3) by means of a guided frame (4) via a pivot point (7) with the movably arranged lever (5) is connected to the underside at a distance from the pivot point (? 8) is fixed, which sits on a cam (9). 2 «Sf © 0prüfgerät according to item 1, characterized in that the drop height by a height adjustment (13) of the cam disc (9) is adjustable. 3. SioBprüfgerät according to item 1, characterized in that the spring element (2) is replaceable. 4. StoBprüfgerät according to item 1 and 3, characterized in that different spring elements (2), regardless of the thickness at a constant height over the impact surface of the anvil (1) survive. For this 1 page drawing