SU1714408A1 - Device for impact testing of articles - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to increase the reliability and convenience of operation by reducing the movement of the device relative to the foundation. The goal is achieved by reducing recoil effort; acting on the device. The device comprises a base 1, a barrel 2 cp batch 3, a piston 4 placed in the barrel 2 for fixing the test product 5, a high pressure chamber 6 communicated through the quick-acting valve 7 with the piston bore 8 of the barrel 2, an additional piston 9 and a trap 10 piston 4. In the wall The barrel 2 at the end of the acceleration section of the piston 9 is made of a window 11 for the discharge of gas. The shutter 3 is made in the form of a piston, and the place of its installation and the mass are selected from the condition of its exit from the barrel 2 at the time the piston 9 passes through the windows 11. This condition allows the piston 9 to be accelerated to the specified maximum speed and eliminates the effect of recoil on the barrel 2. Reset gas from the pre-piston cavity 8 eliminates the possibility of re-impact of the pistons 4 and 9. 1 Il.'SPs

Description

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The invention relates to a test apparatus, in particular to devices for impact testing of products.

The aim of the invention is to increase the reliability and convenience of operation.

This goal is achieved due to the fact that the valve stem of the device is made in the form of a piston, moreover, its installation location and weight are selected from the condition of ensuring its exit from the barrel at the time when windows with an additional piston pass through the barrel wall.

The drawing shows the proposed device for impact tests.

The device comprises a base 1, a barrel 2 mounted on a base 2 with a bolt 3, a piston 4 housed in the barrel to secure the test article 5, a high pressure chamber 6 communicated through a quick-acting valve 7 with a piston cavity 8 of the barrel 2, an additional piston 9 housed in the piston cavity the barrel, and the trap 10 of the piston 4c with the test article 5. In the wall of the barrel 2 at the end of the acceleration section of the additional piston 9 there are openings 11 for the discharge of gas. The shutter 3 of the barrel 2 is made in the form of a piston, and the place of its installation and the mass is selected from the condition of its exit from the barrel when an additional piston 9 of the windows 11 in the wall of the barrel 2 passes. The high pressure chamber 6 is connected to a pressure source (not shown) through the hole 12 and with a pre-piston cavity 8 of the barrel 2 - channel 13. The device includes a clamp 14 of the piston 4, made in the form of a breakable element installed in the wall of the barrel 2. A trap 15 is provided for stopping the gate-piston 3.

A device for impact testing of products works as follows.

An additional piston 9 is installed in the barrel 2. After that, the piston 4 is installed in the barrel 2 with the product under test 5. Then the piston 3 is fixed at a certain distance from the cut of the barrel in the barrel 2. The position of the piston 4 is fixed by a lock 14. the gas (air) is supplied to the chamber 6. Then the opening 12 is closed. In this state, the device is prepared for testing the product. When valve 7 is actuated, compressed air from chamber 6 through channel 13 enters the pre-piston cavity 8. The air pressure in it increases. When the pressure of air in the cavity 8 on the piston 9 is reached, it is sufficient to overcome the friction force of this piston 9,

the latter begins, accelerating, to move in the barrel 2. At the same time, the shutter-piston 3 moves in the barrel 2 in the direction opposite to the piston 9. The speed of the piston 9 increases. The compacted air formed in front of the piston 9 is discharged through the windows 11, which are made in the wall of the barrel 2 (the windows can be of any configuration, including

0 are formed by a system of round holes, the total area of which can be formed by placing plugs (not shown). Piston 4 when the movement of the piston 9 on

5, the section of the barrel until it passes the windows 11 remains fixed, since it is fixed by a latch 14. At the time of the passage of the grooves 11, the piston 9 acquires a maximum speed. After the piston 9 of the window 11 passes through, it begins to compress the air 6 of the part of the barrel 2 formed by the pistons 9 (in the initial state, the air in the barrel 2 is under atmospheric pressure). When exceeding the force of air pressure on the piston 4 of a certain value

the latch 14 is destroyed, and the piston 4 wasps, is provided. With further movement

piston 9 air pressure on piston 4

increases and reaches maximum

0 values at the time of the closest approach of the pistons 9 vf 4. At this point in time, the peak value of shock (inertial) acceleration is formed, acting on the product 5.

5 After energy is exchanged between pistons 9 and 4, piston 4 acquires maximum speed. After the release of the piston 4 y13 of the barrel 2, it is braked by the trap 10 with the allowable

0 for product 5 level of brake acceleration. The trap 10 is made, for example, in the form of dampers and masses freely placed in the guides. If for any reason there is a rebound (movement

5 in the opposite direction of the piston 9 after interacting with the piston 4, this process does not have any negative effect on the product under test, since by this time the piston 3 has already left the bore of the barrel 2 and the formation of an air cushion is excluded. and, therefore, eliminating the repeated forward stroke (in pursuit of the piston 4) of the piston 9. After the piston 3 leaves the barrel

5 2 it is braked by trap 15, completed; for example, similarly to the trap 10. Due to the fact that in the shock test device the breech gate is made in the form of a piston, and its installation location and mass are selected from the condition of

leaving the barrel at the time of the passage of an additional piston windows in the wall of the barrel, provides increased reliability and ease of operation of the device. Formulas and inventions A device for percussion testing of products, comprising a base, a barrel mounted on a base, a piston housed in a barrel for fixing a test product, a high pressure chamber communicated through a high-speed valve with a piston barrel, an additional piston located in a piston barrel cavity. , and a piston trap with the test product, while in the wall of the barrel at the end of the ramp-up section of the additional piston there are openings for the discharge of gas, characterized in that To improve reliability and ease of operation, the valve stem is designed in the form of a piston, and its installation location and weight are selected from the condition

0 its exit from the barrel at the time of the passage of an additional piston window in the wall of the barrel.

Claims (1)

Claim A device for impact testing of products, containing a base mounted on the base of the barrel with a shutter, a piston located in the barrel for securing the test product, a high pressure chamber communicated through a quick-acting valve with a front piston cavity of the barrel, an additional piston located in the pre-piston cavity of the barrel, and a piston trap with the tested product, while in the wall of the barrel at the end of the acceleration section of the additional 5 piston, windows for gas discharge are made, characterized in that, in order to increase reliability and ease of operation, the barrel bolt is in the form of a piston, wherein the place of its installation and 10 weight selected to provide its exit from the barrel at the moment of passage of the additional windows in the piston barrel wall /