RU216883U1 - MACHINE IMPACT SPEED SENSOR - Google Patents

Abstract

The utility model is designed to determine the speeds and energies of machine and instrument parts upon impact. A machine shock speed sensor is proposed, which consists of a cover, a housing, inside of which there is a rod, an electromagnetic coil with a winding and an annular magnet; an insulated wire passes through the hole in the cover and the body, which is configured to be connected to the recording device; a console fixed in the rod, the rod being spring-loaded by an elastic element, and the lower part of the rod moving on a bulk bearing; moreover, the free end of the console is made with the possibility of entering the groove of the tested percussion machine. The free end of the console is hit by the striker of the test machine. The console, connected to the rod, breaks the magnetic circuit, consisting of a cover and a rod, thereby causing an abrupt change in the magnetic flux proportional to the impact speed. The impact impulse is not transmitted to the annular magnet and the coil with a winding. Due to the housing, the coil with the winding and the ring-shaped magnet retain their original position when rebounding after the stroke of the rod. After the impact, the elastic element returns the system to its initial position. At the moment of instantaneous rupture of the magnetic circuit inside the coil, an electrical impulse arises - a signal proportional to the rate of rupture, which is fed to the recording device.

Description

The utility model is designed to determine the speeds and energies of machine and instrument parts upon impact.

Known induction sensor impact speed of machines (patent for invention No. 2110072, bull. No. 12 dated 27.04.98) and used to control the speeds and energies of strikers and impactors when testing machines and impact stands. The sensor contains a magnetic field source, a magnetic circuit, an electromagnetic coil, a rod anchor with a pole tip and an elastic element; the magnetic circuit is formed by a spring-loaded sensor housing, a closed pole tip of the rod armature, while the sensor housing is mounted with the possibility of moving together with the electromagnetic coil of the relative rod armature with the pole tip and breaking the magnetic circuit along its cross section.

The disadvantage of the described sensor is the susceptibility to shock of the coil and the magnetic circuit, while the pole piece is at rest, which leads to displacement of the turns and the creation of a cable effect that affects the measurement accuracy.

The closest prototype of the proposed utility model is (patent No. 161298 "Impact speed sensor of machines", Bull. No. 11 dated 04/20/2016), containing a cover, a housing, inside of which a rod is coaxially located, an electromagnetic coil with a winding and an annular magnet; an insulated wire is made through the hole in the cover and the body, stretched to the recording device; a console is fixed in the rod, the rod is spring-loaded by an elastic element.

The disadvantage of the sensor is the jamming of the rod when hitting the free end of the console.

To eliminate this drawback, a sample was made in the opening of the bottom of the housing, in which a bulk bearing is placed, which allows the rod to move without contact with the walls of the opening of the bottom of the housing.

The device consists of a cover 1, a body 2, inside which is a rod 3, an electromagnetic coil 4 with a winding 5 and an annular magnet 6; an insulated wire passes through the hole in the lid and the body, which can be connected to the recording device 7; console 8 fixed in the rod, and the rod is spring-loaded by an elastic element 9, and the lower part of the rod moves on a bulk bearing 10; moreover, the free end of the console is made with the possibility of entering the groove of the tested percussion machine.

The device works as follows.

The free end of the console is hit by the striker of the test machine. The console, connected to the rod, breaks the magnetic circuit, consisting of a cover and a rod, thereby causing an abrupt change in the magnetic flux proportional to the impact speed. The shock impulse is not transmitted to the annular magnet and the coil with a winding. Due to the housing, the coil with the winding and the ring-shaped magnet retain their original position when rebounding after the stroke of the rod. After the impact, the elastic element returns the system to its initial position. At the moment of instantaneous rupture of the magnetic circuit inside the coil, an electrical pulse-signal appears, proportional to the rate of rupture, which is fed to the recording device.

To prevent jamming of the lower part of the rod in the hole in the bottom of the housing, the rod moves on a bulk bearing, which reduces the sliding friction force when the rod moves.

Thus, due to the fixation of the cover with a fixed annular magnet placed in it and the coil with the winding, the magnetic circuit breaks, that is, the fixed cover with the rod, even with weak shock pulses. In this case, the shock velocity sensor of machines can be installed outside the body of the machine under test due to the console rigidly connected to the sensor rod. All shock loads are not transferred to the parts of the sensor that are weak in terms of overloads, since they are isolated from shocks.

Claims (1)

Impact speed sensor of machines, containing a cover, a housing, inside of which a rod is located; an electromagnetic coil with a winding and an annular magnet, with the possibility of breaking the magnetic circuit along its cross section; an insulated wire passes through the hole in the cover and the body, which is configured to be connected to the recording device; a console fixed in the rod, the rod being spring-loaded by an elastic element, and the lower part of the rod moving on a bulk bearing; moreover, the free end of the console is made with the possibility of entering the groove of the test machine of impact action, characterized in that a sample is made in the hole of the bottom of the body, in which a bulk bearing is placed, which allows the rod, when moving, not to come into contact with the walls of the hole of the bottom of the body.

Images