SU598607A1 - Device for testing the actuators of prostheses with electric drives - Google Patents

Description

one

The invention relates to the field of medical technology and is intended for testing actuators of the prosthesis, with electric drives.

A device for testing actuators of electric prostheses with electric drives is known, which contains blocks of pause, reverse and cycle counter i.

However, the known device does not allow simulating the actual operating conditions and obtaining reliable results when testing the reliability of the actuators.

The purpose of the invention is to simulate the actual operating conditions of the actuators and obtain reliable results when tested for reliability and durability.

For this, the device has a control unit, a time relay and coordinating cells according to the number of mechanisms tested, the control unit being connected to pause units, peFiCpca and coordinating cells, and the unit pausing to a time relay and a cycle counter.

The drawing shows a schematic diagram of the proposed device.

It contains coordinating cells 1 (according to the number of tested objects), block 2 controls the block 3 pauses and block 4 reverses.

a tracking cell 5, a calibration block 6, a manual control system made in the form of a switch 7, with which the control ID of the test objects (manual or automatic) is selected, and a three-position key 8 with a fixed neutral position. For counting the work cycles of the test objects, the device contains an electromagnetic cycle counter and a semiconductor diode 10.

Each coordinating cell contains microswitches 1 1 and 12, each having a single contact group for switching, transistors 13 and 14, thyristor 15, electromagnetic relay 16 with contacts 17 and 18, electromagnetic relay 19 with contacts 20, electromagnetic relay 21 with contacts 22 and 23 , pilot lamps 24 and 25, capacitors 26-28, resistors 29-31, diode 32 and toggle switch 33.

Unit 2 includes an electromagnetic relay 34 with contacts 35, a transistor 36 and a relay 37 with contacts 38 and 39, a capacitor 40, resistors 41, 42 and a diode 43.

Unit 3 mainly consists of transistors 44 and 45, an electromagnetic relay 46 with contacts 47-50 capacitor 51 and resistors 52-54.

Block 4 is a trigger assembled on EoPectromagnetic relays 55 and 56, diodes 57-59, and resistors 60 and 61. The block has an output relay 62 with two groups of Contacts 63 for switching.

The tracking cell 5 mainly contains a transistor 64, a thyristor 65, a capacitor 66, a variable resistor 67, resistors 68 and 69, an electromagnetic relay 70 with contacts 71 and 72, a button 73 with normally closed contacts and a buzzer 74

The calibration unit 6 has an ammeter 75, a calibration resistor 76, a variable resistor 77 and a button 78 with normally open contacts.

Switches 79-82 are used to disconnect any of the tested objects from the power supply of the engines 83-86.

A resistor 87 is installed in the common power supply circuit of a motor driven by a test object, which provides the possibility of observing, on the screen connected to it via the sockets 88 and 89 of the electronic oscilloscope, the current waveform flowing through the motor winding drive () from the test objects, cent.; 1 onpezteeni time movement of the drive links and the magnitude of the current when the latter.

The device works as follows (race: we simulate a case of testing electric brushes with an electric drive). Before switching on the unit, make sure that the switch 7 is in the middle position, the toggle switches 33 are open and the switches 79-82 are in the closed position. At the time of turning on the power, the devices are lit control 25, indicating that the installation is ready for operation. After the power source of the test objects was switched on in the network, the switch 7 was switched to the position corresponding to the automatic control of the test objects. UejiH feeding the objects is commuted so that at the first insertion of the fingers of all the tested brushes begin to move in the direction of their closing. When the fingers are fully bent, pressing the lever of the microswitch 11 causes it to trigger. At the same time, the negative pole of the capacitor 26 is connected to the negative pole of the power source, and the capacitor is charged. Part of the capacitor charge current, coming through diode 32 to the base of transistor 13, unlocks it for some time. With an appropriate selection of the ratings of the elements in the circuit, this time is sufficient for the short-time operation of the relay 16. Contacts 7 of this relay, closing, provide the supply voltage to the coil of the electromagnetic relay 16 in addition to the transistor 13 and block this relay after the capacitor 26 stops charging current, and through the second pair of contacts 18, this relay is fed to the control lamp 24 and the capacitor 28. The control lamp 24 lights up, stating that the fingers of the hand

performed movement on the tong. The capacitor 28 is charged through the resistor 30 and the potential of its upper circuit is connected via the variable resistor 31 to the base of the transistor 14. As the capacitor charges ;. 28 grows the collector current tr; nizistor 14 and as soon as its value reaches the value of the current running for the thyristor 15, the latter opens, causing the relay 19 to trip. Time from the moment you press the fingers on the lever

0, the microswitch 11 until the moment when the relay 19 is triggered is the holding time of the brush drive motor under current after the movement to the gripper. It is a necessary component of the test program that approximates their conditions to the actual conditions of use of the brush and can be adjusted using a variable resistor 31. When relay 19 is triggered, its contacts 20, switch, open the power supply circuit of the coordinating cell elements and turn on the power to the winding Relay 21. At the same time, the lamps 24 and 25 are extinguished, indicating that this brush performed the movement to the gripper in accordance with the test program. At the same time, the relay 16 is de-energized, its contacts 17 and 18 return to their original position, preparing the cell for the next operation. The relay 21 with its normally closed contacts 22 breaks the power supply circuit of one of the brush drive motors 83-86, and the normally open contacts 23 with 23 contacts. closes the power circuit section of the relay 34 of the control unit of the unit 3 pause and unit 4 of the reverse.

After this, the last test object and the last coordinating cell will work this way, the last section in the power supply circuit of relay 34 will be closed. This relay is activated and through its normally open contacts 35 connects capacitor 40 to the power supply (not shown).

0 The control unit of the pause unit 3 and the reverse unit 4 operates similarly to the first stage of the coordinating cell, which includes a capacitor 26, a diode 32, a transistor 13 and a relay 16. Therefore, the closure of the contacts 35 re, jT-34 will cause short-term operation of the relay 37. It has two groups of groups 38 and 39 for switching. The first of them controls the operation of block 3 pauses, and the second controls the block of reverse. At the time of the relay 37, its contacts 38 connect a capacitor 51

through a resistor 52 to the power supply, and this capacitor is charged. In the release 37, the capacitor 51 is connected via the resistor 54 to the base of the composite transistor 44-45 and discharged through this composite transistor and the resistor 53. When the capacitor 51 is connected to the base of the transistor 44, the relay 46 of the pause unit 3 is activated. Relay 46 is released after the capacitor 51 discharges to such an extent that the collector current of the composite transistor becomes

less current release relay. The hold time of the relay (pause time) can be adjusted using a variable resistor 53.

When the relay 46 trips, its normally closed contacts 47 break the common power supply circuit of the engines of 83-86 drives of the test objects for a pause, providing some "rest" for the latter. At the same time, normally closed contacts 48 of this relay break the common power supply circuit of relays 19 and transistors 15 of all coordinating cells, as a result of which relays 19, 21 and 34 are de-energized. Voltage is supplied to elements of coordinating cells, lamp 25 lights up, indicating that the coordinating cell is ready for the next work cycle. A second group of contacts 39 of relay 37 controls the operation of block 4 of the reverse, the output relay 62 of which changes its state through the timing of the operation of relay 37. The contact groups 63 of relay 62 change the voltage supplying the drive motor to reverse polarity. In addition to providing a pause, the relay 46 controls the operation of the tracking cell 5 and the operation of the electromagnetic cycle counter 9. Through the contacts 49 it controls the monitoring cell 5, which is an electronic time relay. When triggered and released by relay-46, its contacts 49 periodically connect capacitor 66 either to the charging circuit consisting of resistors 67 and 68, or to the discharge resistor 69. In this case, the connection to the charging circuit occurs during the operation of the drives, and discharge circuit - during a pause.

If, for any reason, the operation time of any object exceeds the setup time of the tracking cell 5, set using variable resistor 67, then relay 70 is activated. Contacts 71 of this relay, close, will trigger the unit 3 pauses and power off all drives through the contacts 47 and the contacts 72 will receive a voltage on the buzzer 74. According to the status of the pilot lamps 24 and 25, it is determined in which object the fault occurred. Since the relay 70 is controlled by the current of the thyristor 65, in order to turn on the device later, the button 73 is pressed, breaking the power supply circuit of this thyristor. Each time relay 46 is triggered, its contacts 50 are closed, through which power is supplied to counter 9. Due to the fact that diode 10 is turned on in the winding circuit of meter 9, the meter will operate with a certain polarity of the incoming voltage to it. This achieves the counting of only complete cycles of movement of the fingers: flexion + extension.

If necessary, you can turn off one or more of the test objects, continuing to test the rest. To do this, you need to turn the toggle switch 33 of the corresponding coordinating cell and one of the switches 79-82 of the corresponding channel. To the “off” position.

The device makes it possible to control the stability in time of some parameters of the objects under test (the time of movement of the drive mechanism links from one extreme position to another, the magnitude of the operating and maximum current of the drive motor) and the technical condition of the object, which manifests itself in a change in engine load during drive operation. For this purpose, an electron oscilloscope input is connected to sockets 88 and 89 (not shown). In this case, the controlled object is left working, the rest must be disconnected from the control and power supply to the toggle switches 33 and to the switches 79-82, respectively. To calibrate the sensitivity of the oscilloscope, the three-position switch 8 is shifted to the middle position and, periodically pressing the button 78, using the variable resistor 77, sets the selected calibration current value, controlling it with an ammeter 75.

Coordinating cells receive a signal about the execution of motion objects in a given volume from microswitches, sensors monitoring the execution of specified motions and the mechanism links that operate at extreme positions.

Each coordinating cell disconnects its object from the power supply circuits after it has completed a given amount of movement and signals this with a light indicator. The coordinating cells are interconnected with each other and with the control cell of the pause unit and the reversing unit in such a way that the pause and reversal of the movement of the test objects can be realized after the movement specified by the test program has been completely completed.

from the test objects, with the next movement of the links of all objects starting simultaneously.

Thus, the possibility of mismatching the work of the test objects and the accumulation of the test program is eliminated.

Claims (1)

1.. USSR author's certificate No. 196249, M. KL.2 A 61 B 5/04. 1967.