SU1262386A1 - Device for measuring pre-impact speed of working tool striker head - Google Patents

Abstract

The invention relates to a measurement technique and makes it possible to increase the accuracy of operation of the device by approximating the measurement conditions to the operating conditions of the working tool. After striking briskly 1 to the working tool 2, the front of the first electrical impulse carries information about the end of the movement. CA, coming to the input of block 8 conversion. Frequency meter 9 measures the duration of the pulses coming from the conversion unit 8, and supplies to the input of the adder 11 a signal proportional to the arrival time of the first fronts from the working tool 2 and from the sensor 6 for detecting the passage of a shock wave. The adder 11 produces an algebraic addition of the input signals of the signal and sends a signal to the input of the 12th speed determiner, which is proportional to the travel time of the striker of the 1-dimensional path. 2 Il. FIG. 2

Description

1 The invention relates to a measurement technique and can be used to measure the impact energy of percussion machines. The purpose of the invention is to improve the accuracy of the device by approximating the measurement conditions to the operating conditions of the working tool. FIG. 1 is a block diagram of the proposed device J in FIG. 2, timing diagrams explaining its operation. The device for measuring the pre-impacting speed of the hammer contains the head 1 of the tested mapine, the working tool 2 with the contact sensor 3 consisting of the lifting rod 4 and the return spring 5, the supporting rod 4 protruding above the end of the working tool 2 by a value of 1. At the distance h From the same end of the working tool 2 is the sensor 6 for detecting the passage of a shock wave. The device also contains a voltage source 7 connected to the driver 1, a conversion unit 8, a time interval meter in the frequency counter 9, an electric unit 10 of the shock wave transit time, an adder 11, a velocity determiner in the form of a dividing device (recorder) 12, a block 13 indications (registrator) and an electric setting device 14 of the length of the measuring section, the working tool 2 and the shock wave recording sensor 6 being connected to the conversion unit 8, which through the frequency meter 9 an adder 11 and a speed determiner 12 coupled with the block 13. The time setting unit 10 the passage 40 tion

No shock wave is connected to the second input of the gate 11, and the unit 14 of the length of the measuring section is connected to the second input of the velocity determiner 12.

The device works as follows

The striking speed of the striker, V, is determined by dividing. The measuring part of the path 5, equal to the length of the moving contact, by the striker's travel time of this distance. The time of the striking of the measured part of the path is equal to the time of the collision of the striker 1 with the movable rod 4 and the arrival of the signal from the sensor recording the passage of the shock wapna behind the BbFieTOM time the shock wave travels the distance from the tool face to

The front of the pulse from the working tool 2 carries the cutter of the gastric pathway equal to Γ, after striking the striker 1 at the working

The tool 2 from the sensor 6 for detecting the passage of a shock wave due to direct and reflected waves, also receives several electrical signals at the input of the conversion unit.

pulses, but the information on the end of the movement of the striker along the measured section of the path is carried out by the leading front of the first electric pulse, which enters the input of the conversion unit 8

The latter converts electrical ..-. impulses arriving at its input, impulses whose duration is equal to the time between the appearance of the first 6 places of the installation of the sensor registration of the passage of the shock wave Therefore, before measuring the pre-impact speed of the striker, it is necessary to determine the length of the movable contact 2 and the distance from the end of the working tool 2 to the installation location shock wave detection sensor 6 (h). Using the setting device 14, the length of the dimensional part of the path to the speed separator 12 is given a signal proportional to the moving contact, and using the setting unit 10 to the adder 11 a signal is sent that is proportional to the time the shock wave travels the distance h. Before striking a striker 1 on the working tool of an injector 2, a striker 1 per state hit a movable rod (moment t |, -4Hr.2). As a result, the voltage from the voltage source 7 through the head 1, the movable rod 4 of the contact sensor 3 and the working tool 2 enters the conversion unit 8. After striker 1 strikes a working tool 2 (MOIM8HT tj, Fig.2) and the shock wave reaches the sensor installation point, passes shock wave 6 (time t, fig2), the voltage from the shock wave transmission sensor 6 goes to the input of the B transform unit . From the working tool, due to the closing of the electrical contact, when the movable rod 4 moves and when the striker 1 strikes the working tool 2, several impulses flow to the input of the conversion unit, but the beginning of the movement of the striker 1 through

an electric pulse from the working tool 2 and the first pulse from the sensor 6 for detecting the passage of a shock wave.

Frequency meter 9 measures the duration of the pulses coming from the conversion unit 8, and supplies to the input of the adder 11 a signal proportional to the arrival time of the first fronts from the working tool 2 and from the sensor 6 for detecting the passage of a shock wave. At. When a signal arrives from the frequency meter 9, the adder 11 produces an algebraic addition of the input signals and sends a signal to the input of the speed determiner 12, which is proportional to the time the brisk meter passes the measured path.

The determinant 12 of the speed produces a division of the signal coming from the generator 14 of the length of the measured section of the 1H signal, coming from the adder 11

Thus, the signal at the output of the speed determiner 12 is proportional to the pre-hammering speed of the striker. When a voltage comes from the output of the speed detector 12 to the input of the display unit 13, the latter outputs information about the speed of the striker in a convenient form for the operator, which can be represented in digital analog or graphic form.

Claims (1)

Invention Formula A device for measuring the pre-hammering speed of the striker of the working tool, containing an electrical voltage source connected to the striker, a contact sensor in the form of a spring-loaded movable rod installed in the body of the working tool electrically connected through a conversion unit to a time interval meter, and that, in order to improve the accuracy of the device by fitting the measurement conditions to the operating conditions of the working tool, shock wave sensor installed in the body of the working tool, an electrical predeterminer of the length of the dimensional section, an electrical unit for the passage of the shock wave, an adder and a divider, while the contact sensor is made without isolating the movable rod, the output of the shock wave sensor is connected intervals, the output of which is connected to the first input of the adder, the second input of which is connected to the electric unit of the length of the measuring section, and the output - to the recorder.