RU2526553C2 - Computer-aided helical spring output performances control test bench - Google Patents

Abstract

FIELD: instrumentation.

SUBSTANCE: invention can be used for automated definition of moment developed by various springs and for quality control of their manufacture. Proposed device comprises test bench with output shaft connected with tested spring inner end clamp. Tested spring outer end clamp is coupled with bench output shaft engaged in its turn via reduction gear with motor. The latter is connected to drive control unit output. Besides, it comprises reversing unit and pulse counter, its input being connected to angle transducer output and info output connected with measurement termination decoder. It includes comparator with input connected to photoreceiver connected with light source via optical system mirror. Integrator output is connected to input of analogue-memory unit with output connected to current control unit input. Info output of the latter is connected to ADC input. Info output of the latter is connected to registrator initiation input. Besides, it comprises adjusting device, rocker, moving balancing weight, electromagnet traction winding connected to current control unit control outputs. Electromagnet armature is fitted at rocker first arm, rocker being rigidly secured at test bench output shaft. Optical system mirror and moving balancing weight are fitted at rocker second arm. Said weight is connected with adjusting device. Device includes switch, measurement initiation unit and clutch assy. The latter coupled angle transducer input shaft with test bench input shaft while its control input is connected to switch control input.

EFFECT: higher accuracy of measurements, expanded range of measurements, higher efficiency.

5 cl, 1 dwg

Description

The invention relates to the field of measuring technology and can be used to automatically determine the magnitude of the moment created by a flat spiral spring or torsion bar with an unlimited twist angle, a flat spring that works on bending, selective selection of springs close in characteristics with a given accuracy, quality control of the technological process stages manufacture.

A device for controlling the torque of coil springs according to A.S. USSR SU No. 1081446, G01L 3/10, publ. 03/23/1984, Bulletin No. 11, containing a base, a socket, a twisting spindle with a control lever rigidly fixed on it, a sensor and an electromechanical drive associated with a twisting spindle.

Device for measuring the moment of coil springs according to A.S. USSR No. 777504, G01L 3/10, publ. 11/07/1980, Bulletin No. 41 contains a movable part installed in the housing using stretch marks, an angular position sensor for the movable part, an amplifier, a torque sensor in the form of a permanent magnet fixed to the movable part, and fixed coils and a stiffener for stretch marks.

Semiautomatic device for checking the torque of coil springs according to A.S. USSR No. 4333367, G01L 3/10, publ. 06/25/1974, Bulletin No. 23 contains a sleeve freely mounted on a spinning spindle, carrying a leash with a dog that engages with the ratchet spindle wheel, and two stop cams, which determine the angular descent of the tested spring in turn, mechanically interacting with rigid tilting stops , two electromagnetic sensors, two cargo levers.

Test bench for output characteristics of coil springs according to A.S. USSR No. 1732196, G01L 3/10, publ. 05/07/1992, Bulletin No. 17 contains an angle sensor, a pulse counter, a control unit, a drive, a comparator, an integrator, an analog-to-memory unit, a current control unit, an analog-to-digital converter, a decoder, a multiplexer, a start unit, a delay unit, a drive , light source, photodetector, disk with a hole, angle sensor, support, electromagnetic frame, input shaft, output shaft, recorder.

The disadvantages of these devices include the presence of errors in the mechanisms for setting and counting the moments of twisting of the springs due to friction between moving structural members, the difficulty of measuring the parameters of springs and torsion bars with a small moment and a twist angle of more than one revolution, the lack of automated collection of information points on a given range of working angle springs, processing information about the quality of the springs and selecting springs with a registrar with similar characteristics, which is important for measuring instruments.

The closest in technical essence to the claimed technical solution, taken as a prototype, is an automated stand for monitoring the output characteristics of spiral springs (Patent for invention RU No. 2075895, G01L 3/10, publ. 03.20.1997, bulletin No. 8) containing a movable an electromagnetic frame connected through the output shaft of the test bench to the clamp of the inner end of the test spring, and a clip of the external end of the test spring, connected to the output shaft of the test bench, the input shaft of the test bench connected to the output shaft of the angle sensor and the gearbox, soy dynamically coupled to the electric motor, the drive control unit, the first input of which is connected to the output of the And element, the first input of which is connected to the first output of the start-up unit, the second output of which is connected to the setting inputs of the pulse counter and the analogue of the storage unit, and the input - with the output of the recorder, comparator the input of which is connected to a photodetector connected to the light source through the optical system, and the output through the integrator is connected to the information input of the analog-storage unit, the output of which is connected n with the input of the current control unit, the control outputs of which are connected to the electromagnetic frame through the conductive supports, and the information output is connected to the input of the analog-to-digital converter, the information output of which is connected to the first information input of the multiplexer, the triggering input of which is connected to the output of the analog-to-digital converter, the triggering input of which is connected to the output of the delay unit, the input of which is connected to the second input of the drive control unit and the clock output of the pulse counter, the input of which is connected with the output of the angle sensor, and the information output is with the output of the decoder of the end of the measurement and the second input of the multiplexer, the output of which is connected to the recorder, a mirror on the output shaft of the stand, optically connected to the photodetector and through the optical system to the light source, and the decoder of the beginning of the working angle of the spring, the OR element and the reversing unit, the first input of which is connected to the output of the drive control unit, and the second input is the output of the OR element, the first input of which is connected to the installation input respectively, the pulse counter and the analog-memory unit, and the second output of the start block, the second input with the input of the reversal of the pulse counter and the output of the decoder of the end of the working angle of the spring, and the output of the decoder of the beginning of the working angle of the spring is connected to the second input of element I.

The disadvantages of the prototype include the lack of effectiveness of the control stand: lack of accuracy due to the presence of conductive supports of the magnetic frame, causing contact transition resistance during its movement and as a result of installing the mirror on the output shaft of the stand; underestimated measurement range due to insufficient force developed by the frame; poor performance due to the presence of a delay unit in the control circuit.

The technical result, which the invention is aimed at, is to increase the efficiency of the stand: increasing the accuracy of measuring the moment created by the spring during the control process, expanding the range of measured moments and eliminating errors from changing the properties of the permanent magnet that rotates the frame in time due to aging, as well as increasing control performance by eliminating the delay unit from the control functional circuit.

The technical result is achieved by the fact that in an automated test bench for the output characteristics of coil springs containing the output shaft of the stand connected to the clamp of the inner end of the test spring, and the clamp of the external end of the test spring connected to the input shaft of the stand connected via a gearbox to the electric motor, which is connected to the output of the drive control unit, a reversing unit, a decoding end decoder, an analog-to-digital converter, a recorder, an analog-memory unit, a current control unit m, a pulse counter, the input of which is connected to the output of the angle sensor, and the information output with the decoder of the end of the measurement, a comparator, the input of which is connected to the photodetector connected to the light source through the mirror of the optical system, an integrator, the output of which is connected to the input of the analog-memory unit, the output of which is connected to the input of the current control unit, the information output of which is connected to the input of an analog-to-digital converter, the information output of which is connected to the input of the recorder, and the trigger output is from The recording input of the recorder, new is that it introduced an adjustment device, a rocker, a balancing weight, a traction winding of an electromagnet connected to the control outputs of the current control unit, an electromagnet core mounted on the first arm of the rocker arm, which is rigidly fixed to the output shaft of the stand, and on the second arm of the rocker arm there is a mirror of the optical system and a moving balancing weight mechanically connected to the adjusting device, a key whose input is connected to the output of the compa ora, and the output with the integrator’s input, a measurement start block, a clutch assembly that connects the input shaft of the angle sensor to the input shaft of the bench, and its control input is connected to the control input of the key, the first input of the first AND element, the output of which is connected to the output through the reverse unit the drive control unit and the electric motor, the output shaft of which through the gearbox is connected to the input shaft of the bench, and the output of the clutch control unit, the first input of which is connected to the first output of the measurement start unit, and the second input is connected with the installation inputs of the pulse counter, analog-memory unit, integrator and the output of the first OR element, the first input of which is connected to the second output of the measurement start unit, the third output of which is connected to the first input of the drive control unit, and the second input of the first OR element is connected to the output the second element And, the first input of which is connected to the output of the element NOT, the second input is connected to the output of the recorder and the first input of the third element And, the output of which is connected to the second input of the drive control unit, and the second input is connected to the output of the decoder of the end of the measurement, the input of the element NOT and the first input of the second OR element, the second input of which is connected to the clock output of the pulse counter, and the output is connected to the third input of the drive control unit and the first input of the fourth element And, the output of which is connected to the triggering input of the analog-to-digital converter, and the second input is connected to the output of the comparator, to the second input of the first AND element, the key input and the triggering input of the analog-to-memory unit, and the input shafts are the sensor angle and clutch assembly, the input shaft of the stand and the output shaft coaxially arranged on the stand supports.

In an automated bench for controlling the output characteristics of spiral springs, the traction winding of the electromagnet is equipped with a magnetic circuit. In an automated test bench for controlling the output characteristics of coil springs, the clutch assembly is made in the form of an electromagnetic clutch. In an automated test bench for controlling the output characteristics of coil springs, the magnet core has a geometric profile shape that provides linearity in the conversion of current through the traction winding of an electromagnet at a time. In an automated test bench for controlling the output characteristics of coil springs, the electric motor is equipped with an electromagnetic braking clutch.

The invention is illustrated in figure 1, which presents a structural-functional diagram of an automated stand for monitoring the output characteristics of coil springs.

Here:

1 - output shaft of the stand;

2 - clamp the inner end of the spring;

3 - test spring;

4 - clamp the outer end of the spring;

5 - block reversing;

6 - input shaft of the angle sensor and the clutch assembly 30;

7 - angle sensor;

8 - input shaft of the stand;

9 - an electric motor;

10 - drive control unit;

11 - pulse counter;

12 - decoder of the end of the measurement;

13 - a comparator;

14 - photodetector;

15 - light source;

16 - a mirror;

17 - optical system;

18 - integrator;

19 - analog storage unit;

20 - current control unit;

21 - analog-to-digital Converter;

22 - the registrar;

23 - the third element And;

24 - clutch control unit;

25 - adjusting device;

26 - movable balancing load;

27 - rocker;

28 - traction winding of an electromagnet;

29 - core of an electromagnet;

30 - clutch assembly;

31 - the first element OR;

32 - block start measurement;

33 - the second element And;

34 - element NOT;

35 - the second element OR;

36 - the fourth element And;

37 - the first element And;

38 - gear;

39 - key;

40 - support.

An automated test bench for controlling the output characteristics of coil springs includes an output shaft 1 of the bench connected to a clamp 2 of the inner end of the test spring 3, a clamp 4 of the outer end of the test spring 3 connected to the input shaft 8 of the bench connected through a gearbox 38 to an electric motor 9, which is connected to the output of the drive control unit 10, the reversing unit 5, the end of the decoder 12, the analog-to-digital converter 21, the recorder 22, the analog-to-memory unit 19, the current control unit 20, pulse counter 11, the course of which is connected with the output of the angle sensor 7, and the information output with the decoder 12 of the end of the measurement, a comparator 13, the input of which is connected to the photodetector 14, connected to the light source 15 through the mirror 16 of the optical system 17, an integrator 18, the output of which is connected to the analog input a storage unit 19, the output of which is connected to the input of the current control unit 20, the information output of which is connected to the input of the analog-to-digital converter 21, the information output of which is connected to the input of the recorder 22, and the trigger output from the start the input of the recorder 22, the adjusting device 25, the movable balancing weight 26, the rocker 27, the electromagnet traction winding 28 connected to the control outputs of the current control unit 20, the electromagnet core 29 mounted on the first arm of the rocker arm 27, which is rigidly fixed to the output shaft 1 of the stand and on the second arm of the rocker arm 27 there is a mirror 16 of the optical system and a movable balancing weight 26 mechanically connected to the adjusting device 25, a key 39, a measurement start block 32, a clutch assembly 30 the first one connects the input shaft of the angle sensor 7 with the input shaft 8 of the stand, and its control input is connected to the control input of the key 39, the first input of the first element And 37, the output of which through the reversing unit 5 is connected to the output of the drive control unit 10 and the motor 9, the output shaft which through a gear 38 is connected to the input shaft 8 of the stand, and the output of the clutch control unit 24, the first input of which is connected to the first output of the measurement start unit 32, and the second input is connected to the installation inputs of the pulse counter 11, analog-memor unit 19, integrator 18 and the output of the first OR element 31, the first input of which is connected to the second output of the measurement start block 32, the third output of which is connected to the first input of the drive control unit 10, and the second input of the first OR element 31 is connected to the output of the second AND element 33, the first input of which is connected to the output of the element NOT 34, the second input is connected to the output of the recorder 22 and the first input of the third element And 23, the output of which is connected to the second input of the drive control unit 10, and the second input is connected to the output of the decoder 12 the end of the measurement, the input of the element NOT 34 and the first input of the second element OR 35, the second input of which is connected to the clock output of the pulse counter 11, and the output is connected to the third input of the drive control unit 10 and the first input of the fourth element And 36, the output of which is connected to the trigger input analog-to-digital Converter 21, and the second input is connected to the output of the comparator 13, to the second input of the first element And 37, the input of the key 39, and the trigger input of the analog-memory unit 19, and the input shafts of the angle sensor 7 and the clutch assembly 30, a shaft 6 of the stand 1 and the output shaft coaxially arranged on the stand supports.

In an automated test bench for the output characteristics of coil springs, the traction coil 28 of the electromagnet is equipped with a magnetic circuit. In the automated test bench for controlling the output characteristics of the coil springs, the clutch assembly 30 is made in the form of an electromagnetic clutch. In an automated test bench for controlling the output characteristics of spiral springs, the magnet core 29 has a special geometric profile shape. In an automated test bench for controlling the output characteristics of coil springs, the electric motor 9 is equipped with an electromagnetic braking clutch.

The control stand works as follows. Before starting the control process, the springs balance the rocker 27 using the load 26 by moving it with the adjusting device 25, focusing on the operation of the comparator 13 according to its indication. The test spring 3 is fixed in the clamps 2 and 4 in the absence of coupling between the output shaft 6 of the angle sensor 7 and the input shaft 1 of the stand. Next, they include a measurement start block 32, which generates a pulse sequence: the first pulse from output 2 through the OR circuit 31 is supplied respectively to the installation inputs of the clutch control unit 24, confirming its disconnected state, and to the installation input of the pulse counter, zeroing it, the analog-memory installation input unit 19, zeroing it, the installation input of the integrator 18, zeroing it, the second pulse from the first output of the block 32 for starting the measurement through the clutch control unit 24 opens the key 39 for passing from the comparator 13 to the integrator 18 and includes a clutch assembly 30 of the input shaft 8 of the stand with the output shaft 6 of the angle sensor, the third pulse from the third output of the measurement start block 32 through the drive control unit 10 includes an electric motor 9, which starts to rotate the input shaft 8 through the gearbox 38 the stand, which is connected with the clamp 4 of the outer end of the spring 3. When tightening the test spring 3 through the clamp 4 of the outer end of the spring 3, the rotation of the output shaft 1 of the stand is created through the spring 3, which unbalances the beam 27 and the beam, creating received from the light source 15 through the optical system 17, when reflected from the mirror 16 does not fall on the photodetector 14, and this triggers the comparator 13, the output of which is the voltage supplied through the key 39 to the input of the integrator 18, the output voltage of which increases and through the analog the storage unit 19 and the current control unit 20 and the traction winding 28 acts on the core of the electromagnet 29, increasing the retraction force, i.e. an increasing counteracting moment is created on the arm of the rocker arm 27 when the spring 3 is tightened by the input shaft 5. When the input shaft 8 of the stand is rotated, the input shaft 6 of the angle sensor 7 rotates, which generates pulses, the number of which will be proportional to the angle of the spring 3. These pulses are applied to the counting input of the pulse counter 11, and when they reach the number corresponding to the reference point of the spring characteristic specified in the recorder, a reference signal appears on its clock output, which The OR element 35 enters the third input of the drive control unit 10 and stops the electric motor 9. At this time, the current in the traction winding 28 rises to fully compensate for the torque of the spring created by the input shaft 8 of the stand. When balancing the rocker arm 27, a comparator 13 is activated, which includes an analog-memory unit 19, fixing the value of the spring moment proportional to the current value through the traction winding 28 of the electromagnet from the control output of the current control unit 20, and through the And 36 circuit starts the analog-to-digital converter 21 of the moment measuring point springs 3 from the information output of the current control unit 20. In this case, the first element And 37 is closed to the passage of the signal, because there is no enable signal from the clutch control unit 24. After the conversion is completed in the analog-to-digital Converter 21, it generates a signal of the end of the measurement, which includes a recorder 22 for collecting and processing information of the values of the torque moment at the specified points of the angle value stored in the program of the registrar. At the end of the process of fixing the measuring point, the recorder 22 generates a start signal for the next measuring point through the open element And 23 to the drive control unit 10 and turns on the motor 9 to go to the next monitoring point, and at that time the And 33 element is closed for the passage of the same signal. After reaching the end point of measuring the angle of twisting of the spring, the decoder of the end of the measurement is activated, which stops the engine 9 through the third input of the drive control unit 10 through the third input of the drive control unit 10. When the moment of operation of the comparator 13 is reached, the analog-to-digital converter 21 is launched through the fourth element And 36 to register the moment value corresponding to the final twist angle of the tested spring. When the decoder 12 is triggered, in addition, the third AND 23 element closes the passage of the start signal of the next measurement point to the drive control unit 10 from the recorder 22 and opens the second AND 33 element through the HE 34 element to pass this signal and as a result, it passes through the first OR circuit 31 acts on the installation inputs of the pulse counter 11, the integrator 18, zeroing it, the analog-memory unit 19, zeroing it, and, accordingly, through the current control unit 20, the traction coil 28 of the electromagnet is turned off. As a result of this, the test spring 3 unbalances the rocker 27 and the comparator 13 is activated. At the same time, the clutch control unit 24, which disables the clutch unit 30, also closes the key 39 for the signal to pass to the integrator 18 and opens the And 37 element for the signal from a comparator 13 to the reversing unit 5, which includes the rotation of the engine in the opposite direction. The reversal process will continue until the comparator 13 is triggered, which turns off the electric motor 9 through the And 37 element and the reversing unit 5. When reversing, the angle sensor 7 does not rotate, so the registration process does not function, but the reversal works, waiting for the comparator 13 to be triggered, which is disconnected from the integrator 18, i.e. full unwinding of the tested spring 3.

All blocks in the stand are sold on known analog and digital integrated circuits, the clutch assembly can be made in the form of an electromagnetic clutch.

Thus, the inventive automated test bench for controlling the output characteristics of coil springs allows increasing the measurement accuracy by eliminating errors from changing the properties of the permanent magnet of the frame rotation over time due to aging, due to preliminary balancing with a moving load on the beam, i.e. eliminate the systematic measurement error, as well as the accuracy of the comparator by installing a mirror on the rocker arm, and by introducing into the design of the electromagnet expand the measuring range of the moments of the spring or torsion, for the study of which it is enough to replace the clamps with end clamps, and to control flat springs, the clamp pattern is practically not changes, reduce the time of examination of the spring, which is determined for each measurement point only by the conversion time of the analog-to-digital converter and reg an itrator, and not at the expense of the delay unit from the functional prototype control circuit. As a result of the collection and processing of information about the characteristics of a certain number of springs, it is possible to select springs with similar characteristics with a given accuracy according to a given program for processing information stored in the recorder.

Claims (5)

1. An automated test bench for controlling the output characteristics of spiral springs, comprising an output shaft of the test bench connected to a clamp of the inner end of the test spring, a clamp of the external end of the test spring connected to the input shaft of the test bench connected to the output of the drive control unit via a gearbox, block reversing, decoder of the end of the measurement, analog-to-digital converter, recorder, analog-to-memory unit, current control unit, pulse counter, the input of which is connected to the angle sensor, and an information output with a decoder of the end of the measurement, a comparator, the input of which is connected to the photodetector connected to the light source through the mirror of the optical system, an integrator, the output of which is connected to the input of the analog-storage unit, the output of which is connected to the input of the current control unit, the information output of which is connected to the input of an analog-to-digital converter, the information output of which is connected to the input of the recorder, and the trigger output with the trigger input of the recorder, characterized in that an adjustment device, a rocker, a moving balancing weight, a traction winding of an electromagnet connected to the control outputs of the current control unit, an electromagnet core mounted on the first arm of the rocker arm, which is rigidly mounted on the output shaft of the stand, and a mirror on the second arm of the rocker, are introduced into it optical system and a movable balancing weight, mechanically connected to the adjusting device, a key whose output is connected to the integrator input, a measurement start block, a stage assembly heating, which connects the input shaft of the angle sensor with the input shaft of the stand, and its control input is connected to the control input of the key, the first input of the first element And, the output of which through the reversing unit is connected to the output of the drive control unit and the motor, and the output of the clutch control unit, the first the input of which is connected to the first output of the measurement start block, and the second input is connected to the installation inputs of the pulse counter, analog storage unit, integrator and the output of the first OR element, the first input to It is connected to the second output of the measurement start block, the third output of which is connected to the first input of the drive control unit, and the second input of the first OR element is connected to the output of the second AND element, whose first input is connected to the output of the element NOT, the second input is connected to the output of the recorder and the first the input of the third AND element, the output of which is connected to the second input of the drive control unit, and the second input is connected to the output of the decoder of the end of the measurement, the input of the element NOT and the first input of the second OR element, the second input of which connected to the clock output of the pulse counter, and the output connected to the third input of the drive control unit and the first input of the fourth AND element, the output of which is connected to the triggering input of the analog-to-digital converter, and the second input is connected to the output of the comparator, to the second input of the first AND element, the key input and the triggering input of the analog storage unit, the input shafts of the angle sensor and the clutch assembly, the input shaft of the stand and the output shaft of the stand located on supports and coaxially. 2. An automated test bench for the output characteristics of coil springs according to claim 1, characterized in that the traction winding of the electromagnet is equipped with a magnetic circuit. 3. An automated test bench for the output characteristics of coil springs according to claim 1, characterized in that the clutch assembly is made in the form of an electromagnetic clutch. 4. An automated test bench for controlling the output characteristics of spiral springs according to claim 1, characterized in that the core of the electromagnet has a geometric profile shape that provides linearity in the conversion of current through the traction winding of the electromagnet at the moment created by the spring. 5. An automated test bench for the output characteristics of coil springs according to claim 1, characterized in that the electric motor is equipped with an electromagnetic braking clutch.

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