SU1651128A1 - Impact machine - Google Patents

Abstract

This invention relates to electromagnetic impact devices for use in impact test benches for products and materials. The purpose of the invention is to expand the operational capabilities by increasing the acceleration rate of the core of the rolling solenoid. The invention will improve the scheme of two-stage acceleration of the core, striker 7 with the help of sequentially installed fixed and moving solenoids. At the first stage, the measles-strike 7 accelerates together with the winding 6 of the movable solenoid by striking the crush-block 4 of the stationary solenoid on the anvil 11, made on the magnetic conductor 5 of the movable solenoid. At the second stage, the bark 7 accelerates relative to the winding 6 by passing pulsed current through it from the second driver 9. The signal for starting the driver 9 comes from the sensor 10 (accelerometer) installed on the anvil. An increase in the acceleration rate is caused by a decrease in the mass of the moving part of the driver, accelerated in the first stage, due to the separation of the moving solenoid from the core of the stationary solenoid. 1 hp f-ly, 1 ill.

Description

The invention relates to a percussion testing technique for articles and materials, namely, electromagnetic shock load drivers, and can be used in test benches for reproducing shock accelerations.

The purpose of the invention is to expand the operational capabilities of a shock load exciter by increasing the acceleration rate of the core of the moving solenoid.

The drawing shows a schematic diagram of the proposed exciter shock load.

The causative agent of shock load contains a base 1, a fixed solenoid mounted on it, having an armored magnetic circuit 2 with located in it

winding 3 and a brisk 4 entranced into its cavity, mounted in front of (along the bark 4) of a stationary solenoid, a movable solenoid, including an armored magnetic circuit 5 with winding 6 located in it and bouncing 7, retractable into its cavity, The first and second pulsed current drivers 8 and 9 connected to windings 3 and 6, respectively, and a sensor 10 to start the second driver 9. Part of the magnetic core 5 of the movable solenoid facing the koryu-striker 4 is designed as an anvil 11 . measles-firing pin 7 is installed inside the anvil 11 on the sound insulation lining 12 (e.g., rubber) As the sensor 10 may be used peeoakseleroO

ate

Yu

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a meter mounted on the anvil 11. To prevent damage to the winding 6, a damping strip 13 is installed between it and the magnetic core 5. On the magnetic conduit 2 a guide tube 14 is installed to install and move the movable solenoid therein. At the end of the tube a damping strip 15 is placed serving for braking the movable solenoid at the end of its acceleration path.

The causative agent of shock load works as follows

In the proposed exciter, the core-block 7 is accelerated according to a two-step scheme: the first stage is the acceleration of the magnetic conductor 5 together with the winding 6 and the bark 7, the second stage is the acceleration of the core-7 against the winding 6 and the magnetic circuit 5. In the proposed The oscillation exciter in the first stage is accelerated by striking the core-box 4, the winding 3 being pulled into the cavity when a pulsed current is passed through it, along the anvil 11. A shock wave driven in the anvil 11 reaches the sensor 10, which produces a signal using emy for starting the second current pulse shaper 9. The impulse of force that arises when a pulsed current passes through the winding 6 acts on the bark head 7, which, together with the winding 6, acquires the speed / n of the portable movement, but remains in the initial position relative to the winding 6, since the shock wave does not reach it (because the gasket 12 significantly reduces the rate of propagation of the shock wave). The armature 7 is drawn into the cavity of the winding 6, acquires the velocity Vo with respect to it (the second stage of acceleration) and interacts with the impact receiver, for example waveguide 16, at the other end the test article is fixed with the velocity V Vn + V0. The velocity Vn relative to the velocity Vfl4 of the core box 4 of the stationary solenoid is determined by the formula

тЯ4 (1 + У) У 4

GWP 4 + GPPG

where rn 4 is the mass of the crust box 4; rrinc is the mass of the moving solenoid c. korem 7;

K - coefficient of impact velocity recovery.

If we accept Я44 gpc and k 0.7 (steel strike on steel), we get Vn 0.85 УЯ4. In the case of the attachment of the mass of the moving solenoid to the core of the stationary solenoid, the velocity Vn is about 0.4 of the velocity Y 4. The separation of the movable solenoid from the core of the stationary solenoid provides an increase in the acceleration rate in the first stage by 110% and second stage - about 32%.

Claims (2)

1. A shock load exciter containing successively mounted fixed and accelerated movable solenoids, each of which has a magnetic core with a coil located in it and a bark drawn into the winding cavity, the measles of the movable solenoid being striker, the first and second  pulse current drivers connected to the windings of the stationary and movable solenoids, respectively, and a sensor for starting the second pulse current driver, characterized in that, in order to expand operational capabilities by increasing the acceleration rate of the core of the movable solenoid, the measurable solenoid measles can move relative to the movable solenoid and is designed as a striker, and part of the magnetic circuit of the movable solenoid facing the core of the stationary solenoid is made in ide anvil. 2. The exciter pop. 1, characterized in that the sensor for starting the second pulse current former is made in the form of an accelerometer mounted on the anvil. sixteen