SU1742619A1 - Device for checking circular pitch of gears - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve accuracy. The device contains photodetectors, a ring laser and an information processing unit. The use of two photodetectors improves the accuracy of measurements. 1 hp f-ly, 3 ill.

Description

The invention relates to a measurement technique, in particular to test instruments for measuring parameters of gear wheels.

A device is known for element-by-element control of gears, for example, monitoring the difference between adjacent district steps, which contains two extreme photoelectric converters, a diaphragm with two gaps having a certain distance between each other, an electronic unit connected via two information inputs to the corresponding photo inputs of electric converters, indicator and controlled wheel. Extreme photoelectric converters, the distance between which is equal to L, adjust to control the selected parameter. When the wheel rotates with the converter, two signals are taken, the time interval between which characterizes the wheel error from the uneven speed of its rotation, and from the converter with

two slits remove signals, the time interval between which characterizes the speed of rotation of the wheel at the time of measuring its error. The result of dividing characterizes the measured value.

The disadvantages of the known device are the following: the device does not give information about the numerical value of the measured value, but gives only relative information. Due to the error in the tooth profile and the linear dimensions of the two slits of a single photodetector, which are dependent on each other, the signals received by the photodetector can have different times of occurrence, which leads to an increase in the measurement error. The principle of coding the information received in the device is temporary, so it also leads to the appearance of an error.

A device for contactless control of gears using an annular laser, containing an electric drive, a controlled wheel, a gauge

cl

with

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BUT

Yu

one turn, ring laser, electromagnetic coupling, illuminator with a projection slot, an optoelectronic converter with a receiving slot, an electronic information processing unit connected by three information inputs to the corresponding outputs of a ring laser, a single revolution meter and an optoelectronic converter, a recording device . Controlled wheel, one turn marker, ring laser, clutch are rigidly on the same axis with the electric drive. The controlled peso is rotated at a constant angular velocity, the interval between two consecutive signals from the optoelectronic transducer is filled with pulses of a ring laser, and from these results the actual values of the gear parameters are judged: the value of the nominal circumferential pitch, the accumulated wheel measurement error etc.

The disadvantages of the known device are the error due to the temporal encoding of the information received from the tooth profile of the controlled Konei, namely the steepness of the front and rear edges of the pulse received from the optoelectronic converter, or the stability of the angular velocity of the wheel, as well as the error due to the presence of a receiving slit in an optical-electronic converter associated with the diffraction of the light signal at the boundary of the slit.

The aim of the invention is to improve the accuracy of measuring the circumferential pitch of gear wheels.

This goal is achieved by the fact that in a device having an illuminator with a projection slit, a ring laser, a one turn marker, an optoelectronic converter, an electronic information processing unit containing three independent information inputs connected to the outputs of a ring laser, one turn indicator and -electronic converter, recording device, controlled gear wheel, opto-electronic converter made in the form of two identical photodetectors, and the electronic processing unit Info has a second input coupled to a corresponding output of the photodetector.

Figure 1 shows the block diagram of the proposed device; figure 2 is a diagram of the operation of the device: on fig.Z - diagram of the processing of the signal reflected from the tooth of the wheel, photodetectors.

The device for controlling the circumferential pitch and the accumulated error of the gear wheels contains (figure 1) the illuminator 1 with a projection slot, identical photodetectors 2 and 3, a controlled gear 4, a ring laser 5, a marker 6 of one revolution, an electronic unit 7 for information processing, a recording device eight.

0B the composition of the electronic information processing unit 7 includes amplifiers-formers 9 and 10 pulses, comparator 11, first 12, second 13 and treuy 14 teeth counters, first logic circuit 15, trig 5 rep 16, counter 17 to two, second logic circuit I 18, the first 19 (for the number of teeth of the wheel is one more) and the second 20 (for one full turn of the marker) pulse registers from a ring laser, circuit 21

0 comparisons, divider 22 by the number of teeth of the wheel, third register 23 of the reference number of pulses, logic block 24, first random access memory 25, second random access memory 26, logical circuit HE 27, subtractive block 28, register 29 constants, multiplier 30 .

The device works as follows.

0 When rotating at a constant angular velocity, a ring laser, a controlled gear and one revolution marker, are rigidly located on the same axis. The projection beam will illuminate the light of the 1st shape of the tooth on the tooth surface with a light dash width H, which, reflected from the tooth, falls on independent photodetectors 2 and 3, occupying consecutive 0-6 positions on the surface (Fig. 3).

0 The signals received by the photodetectors are fed to the third and fourth informational inputs of the electronic processing unit 7 (Fig. 1). On the second information input unit 7 are received

5 pulses from the ring laser 5, and at the first input - signals from the marker 6 of one revolution. The information received digitally by the electronic unit 7 is processed therein and fed to the input

0 recording device 8. Signal processing in the electronic unit 7 of information processing occurs the following way. The third and fourth information inputs of the electronic unit are connected to the inputs of 5 identical amplifiers-drivers 9 and 10. These inputs receive signals from photodetectors. From the outputs of the formers 9 and 10, the pulses characterizing the appearance of a wheel tooth fall on the first and second inputs of the comparator 11, at the output of which we have a sequence of pulses indicating a certain point on the profile of the gear teeth of the wheels (figure 2). These pulses are fed to the inputs of the first 12 and second 13 counters of the wheel teeth and to the input of the third counter 14 of the number of teeth of the wheel (the introduction of the counter 14 is due to the need to obtain information for the complete rotation of the gear to be controlled). The second information input of the electronic unit is connected to the second inputs of the first 15 and second 18 AND logic circuits, which receive signals from the ring laser 5. The first information input of the electronic unit is connected to the input of the counter 17 to two and the second trigger input 16. On the counter to Two and the trigger signals are received from the marker 6 one turn. The inverse trigger output 16 is connected to the input of logic unit 24 and prepares it with its signal, the inverse trigger output issues a signal to the third input of the first logic circuit 15. After the trigger starts, the logic unit issues a command to the first operational memory 25 to record the received them information. The output of the third counter 14 of the number of teeth of the wheel is connected to the first input of the first logic circuit AND 15. Information from the output of this logic circuit goes to the data bus of the first random access memory 25. The address bus of the first random access memory receives signals from the first counter of the 12 teeth, but only 0 in the event that the third teeth number counter gives permission to the second input of the counter 12 (i.e., when information from all the teeth of the wheel is received). In this way, the information is stored in the first random access memory, in each memory cell of which the number of pulses from the ring laser is stored in the gap between adjacent wheel teeth - Ni-g, N2-3, N3-4 ... etc . The signals from the first logic circuit AND 15 are also fed to the input of the first register of 19 pulses, where the number of pulses from the ring laser is recorded per full revolution of the wheel being monitored. The output of the counter 17 to two is connected to the first input of the second logic circuit And 18, and the output of the ring laser is connected to the second input of this circuit.

The pulses from the output of the second logic circuit 18 are supplied from the input of the second register 20 pulses. The output of the register 20 is connected to the input of the divider 22 on the number of teeth of the wheel and the second input of the comparison circuit 21. The last input is connected to the output of the register 19. The output of the divider 22 is connected to the input of the register 23 of the reference number of pulses, where the number of pulses from the ring laser 5 is recorded between the teeth of the wheel - MET. The output of register 19 (Fig. 1) is connected to the first input of the comparison circuit 21. The latter compares the number of pulses or a ring laser listed in

10 registers 19 and 20. If the contents of these registers in the comparison circuit do not match (for example, if a pulse from at least one tooth of the wheel disappears), further information processing stops. When the number of pulses falls, the signal from the comparison circuit arrives at the second input of flip-flop 16, which, upon receiving this signal, returns to the initial state, then the same signal from the sever circuit 0 is sent as a read command to the read input of the first random access memory 25, to the second input of the subtractive unit 28, to the input of the logical circuit NOT 27. which

5 issues a command to write to the second random access memory 26.

The signal from the comparison circuit is also fed to the second input of the second counter 13 teeth, which is connected via its output to the address bus of the second random access memory 26. After the read command arrives at the first random access memory from the comparison circuit, from its output to the first input of the reading unit 28, the contents of the memory cells are received, and in block 28, the reference number of pulses MET is subtracted from the contents of the cells. which is inputted from the output of register 23 of the reference number of pulses to the third input of block 28. At the output of the subtracting block we have: N1-2-N3T-A N1-2, N -3-N3r L N2-3;

Y3-4-Msg AMz-4, - 5

Nn {n + i) -N9r A Nn-On-1),

The information from the output of the subtracting unit 28 is fed to the data bus of the second random access memory 0 26, where this information is recorded, after the end of the recording to the second operative memory, the logical unit 24 from the second output issues a command to read the contents and 5 starts the operation is a register of 29 constants, s which is preliminarily entered by the 2-number of teeth of the wheel, m is the wheel module, 1296 103 angular seconds 360 °. With the release of the register of constants information is supplied to the first

the input of the multiplier 30, and the second from the output of the second random access memory. At the output of the multiplier 30, we have;

Atn- (n + ir A x AMp- (n + 1). Where At is the circumferential pitch error;

.r-t.1 (I

1296-103

L Nn- (n + i) is the number of pulses characterizing the error of the circumferential step.

Information from the multiplier output enters the recording unit 8.

The use of the proposed device for controlling the circumferential pitch of gear wheels will provide the following advantages over existing devices. By using an optical image receiver made in the form of two independent photodetectors, fixing the angular position of the tooth profile is carried out by means of geometric coding of information, which provides a higher measurement accuracy.

In the example of the specific embodiment shown in FIG. 3, the case is considered when the width of the light-receiving surfaces of the photodetector in the sum with the distance between these photosensitive surfaces is equal to the width of the light bar reflected from the tooth, however, for the device to work, this condition is not necessary .

Claims (2)

Claim 1. Device for controlling the circumferential pitch of gear wheels, comprising an illuminator with a projection slot, a one turn marker and a ring laser mechanically connected to the controlled wheel, an opto-electronic converter and an electronic processing unit whose inputs are connected to the outputs of the marker one turn, a ring laser and an opto-electronic converter, a recording device, characterized in that, in order to increase the accuracy, the opto-electronic converter is made in de two identical photodetectors, the outputs of which are first and second output optical-electronic transducer, and electronic information processing unit is configured with a fourth input connected to the second output of the opto-electronic transducer. 2. The device according to claim 1, characterized in that the electronic processing unit 5 is made up of two driver amplifiers whose inputs are the third and fourth inputs of the electronic unit, respectively, serially connected comparator, first teeth counter, first random access memory, subtractive unit, second random access memory, multiplier, and recording unit, connected in series 5 of the first AND logic, the first input of which is the second input of the electronic unit, the first pulse register, the comparison circuit, the output of which is connected to the second input of the first random access memory and the second input of the subtraction unit, and the logic circuit NOT, the output of which is connected to the second the input of the second random access memory, connected in series 5 counters up to two, the input of which is the first input of the electronic unit, the second logic circuit AND, the second input of which is combined with the second input of the electronic unit, the second register of pulses, the output 0 which is connected to the second input of the comparison circuit, the divider by the number of teeth m of the third register, the output of which is connected to the third input of the subtracting unit, the second counter of the teeth, whose inputs 5 are connected to the outputs of the comparator and the comparison circuit, and the output is connected to the third input of the second random access memory, the third tooth counter connected between the outputs 0 comparator and the second input of the first logic circuit And, and serially connected trigger, the inputs of which are connected to the first input of the electronic unit and the output of the comparison circuit, and the output 5 is connected to the third input of the first random access memory and the register of constants, the output of which is connected to the second input of the multiplier, and the fourth inputs of the first and second operational memory 0 are connected to the output of the first logic circuit AND and the first output of the logic unit, respectively. Z: fo & opo,  m 2tT -i296-103t s & l Jr & m h {XdfXi Jpf6eff 2rr t296-W ioSopom z, C 2 L P Aw p P i p fe N v l