SU968650A2 - Braking device to stand for impact tests - Google Patents

Description

The invention relates to testing equipment, in particular to impact testing of products, namely to brake devices of test benches. ,

According to the main USSR model No. 796691, a braking device to a test bench is known, which contains a mass captured by a mobile carriage, distributed over the length of the braking section and made in the form of a flexible long-length element with a variable cross-section along its length, links of various size 1.

However, the prior art device makes it possible to obtain brake impulses of a highly complex α-form. To do this, you only need to make a chain with the appropriate parameters of its links. To obtain a chain with the required parameters of the links, you can either make a new chain for each desired pulse shape, or you can have the necessary set of different links and assemble the required chains from them. The first method is extremely low-tech and expensive. The second one entails a sharp increase in the metal intensity of the braking device, since the number and mass of the required spare links can be very large. For example, when using 25 types of links of 1 kg up to 25 kg with intervals of 1 kg and, having made up chains of 25 links each, it will be required to provide all variants of chains from this set

10 links total mass of all links is equal, kg:

M 25. (1 + 25) - 1 9125,

15

while the heavy chain itself, composed only of twenty-kilogram units, will have a mass, kg:

M 25-25 62520

In addition, the manufacture of a large number of different types of links is also rather not technological because, in this case, the masses of links 25 are discrete, the reproduction of the pulse shape will be discrete, i.e. not entirely accurate.

Claims (3)

The purpose of the invention is to reduce the metal content, improve the processability of the braking device and increase the accuracy of reproduction of a given form of the brake: impulse. This goal is achieved by the fact that in a braking device to a test bench, containing mass, captured by a mobile carriage, distributed over the length of the braking section and carried out in the form of a flexible long-length element with a variable cross-section Links of various sizes, links of a chain are made in the form of hollow cylinders filled with bulk material, closed with plugs. Moreover, the cylinders and caps are made of a light alloy, for example, titanium, and lead shot is used as the bulk material. In addition, the plugs are made in the form of glasses. This embodiment allows the bulk material to be filled into the internal cavity of the link (it is best to use a material with a high light weight, such as lead shot) to change the mass of the link in a wide range. To expand the range, the link itself is best made from light alloys, for example titanium, as in the STOM case the ratio is MM. .ev where MJP is the mass of the link; M is the mass of bulk material poured into this unit; it is easy to make about 5 or more. Having a supply of bulk material in a range of 600 kg and a set of links in two sizes with 1 kg and 5; kg, you can easily solve a problem that requires 9125 kg of metal and 25 sizes of links, ie a sharp decrease in metal consumption of the braking device and simplification of its manufacturing technology. In addition, it is possible to get the masses of links not discrete, but continuous, therefore, you can improve the accuracy of reproduction. The implementation of the staples in the form of stacks allows one to increase and regulate the total volume of the internal cavities of the link to fill them with a bunch of material, thereby increasing the ratio k, i.e. reduce the number of sizes required links ev. , Figure 1 schematically shows the proposed device, a general view of figure 2 - view A in figure 1. The brake device to the shock test bench, which is connected to the movable carriage 1 with the product 2 moving along the guide 3, is a chain made up of links 4. The first link on the left chain is provided with a gripping device 5, for example, with a hook hook 6 carriage 1. Link 4 is made in the form of hollow cylinders and pivotally interconnected by means of lugs 7 and axes 8. Caps 9 are screwed on the ends of the cylinders in the form of glasses. Bulk material (not shown) is loaded into the internal cavity formed by the cavity 10 of the link 4 itself and the cavities 11 of the plugs 9. The size of the internal cavities 11 of the plugs 9 allows you to adjust the ratio k. In order to increase the ratio k, the links 4 and the plugs themselves are best made of light alloys, for example titanium, and for filling them, materials with a higher specific weight, for example, lead shot, are used. The operation of the braking device is as follows. Previously, in accordance with the required law of braking, the required mass of each link 4 is calculated, the required amount of bulk material is poured into the links and screwed up plugs-9. When the carriage 1 is accelerated, the hook 6 engages with the gripping device 5 and the carriage starts to engage the chain consisting of links 4 in motion, thus forming a braking impulse, the shape of which depends on the mass distribution of the links 4. Using the proposed invention allows to obtain a variety of forms of braking pulse with a significant reduction in metal consumption of the braking device, and also increases the accuracy of reproduction and reliability of the test results. Claim 1. Braking device to the stand for impact tests according to auth.St. USSR 796691, differing from the fact that, in order to reduce metal intensity, improve manufacturability and improve the accuracy of reproduction of a given form of braking impulse, chain links are made in the form of hollow cylinders filled with bulk material, closed with plugs. 2. The device according to claim 1, characterized in that the cylinders and plugs are made of a light alloy, for example titanium, and Lead shot was used as a material. 3. The device according to PP. 1 and 2, characterized in that the plugs are in the form of glasses. Sources of information taken into account in the examination 1. USSR author's certificate number 796691, cl. G 01 M 7/00, 1979 (prototype). ///// r ///////// //// y / y // // // // // /. Fig / b