SU756205A1 - Position sensor - Google Patents

Description

The invention relates to automatic devices and is intended to produce electrical pulses corresponding to the direction of movement of the monitored body. The device can be used, in particular, to control the position of regulatory bodies moving in hermetic volumes, for example, in the apparatus of the chemical industry. '

A device containing magnetic contacts and a relay switch with an excitation winding, made on the magnetically-controlled contact (MUK) [ί] ..

The disadvantage of this device is the impossibility of issuing a signal during reverse movements, less than one revolution and, in addition to 20

t ^ rgo, when two MUKs are closed, two signals are issued about the movement of the controlled body in different directions at the same time.

A device is known that contains 25 MUKs, diodes, a trigger, semiconductor switches and signal elements £ 2].

The disadvantages of the known devices are: the possibility of losing 30

2

information about the direction of movement when the device rotor moves "forward" or "back" when the device is de-energized for a short time when the PSD magnet is located by the two MUKs (they are closed at the moment) and the inability to obtain information about the direction immediately after changing the direction of movement.

The closest to the invention is a device containing a MUK, a differentiating circuit connected to the MUK, an inverting element, a Zener diode and a thyristor, which are signal elements of the direction of movement [3}.

The disadvantages of the known devices are: the presence of preparatory cycles preceding the moment of the immediate issuance of a signal about the direction; the complexity of the sensor circuit when used to indicate the direction of linear displacements in a large number of discrete points; issuing false information about the movement in the event that the latter ceased immediately after the moment of issuing a signal about the movement.

3

756205

four

The purpose of the invention is to improve the accuracy of determining the direction of movement and simplify the device when determining the direction of movement in a large number of controlled points.

This goal is achieved by the fact that in the position sensor containing MUK, differentiating circuit, inverting element, introduced elements AND and OR, additional MUK, differentiating circuit and inverting elements, MUK combined into groups of three, elements And united into groups of four, the first the inputs of the elements of And each group are interconnected, the same names MUK of each group are interconnected and connected each to the corresponding differentiating circuit and to the first inputs of the elements AND of the corresponding group, the second input of the first elements s and each group is connected to a corresponding output of the differentiating circuit and through an inverting element corresponding to the second '

the input of the third elements AND of each group, the second input of the fourth elements AND of each group is connected to the output of the corresponding differentiating circuit and the second input of the second elements AND of each group, the outputs of the first and second elements AND of each group are connected to the inputs of one OR element, and the outputs of the third and the fourth element AND each group are connected to the inputs of another element OR.

The drawing shows the layout of the position sensor.

The sensor contains the first 1 and second 2 groups of MUKs 3-8 (the number of groups in the sensor can be any) connected by one combined outputs to the positive power source; 11 and one of the inputs of the two-input elements ⁷ and 12-23. The outputs of the differentiating circuits 9-11 are connected to other inputs of the elements And directly or through inverting elements 24-29. Outputs of all elements And combined. using two elements OR 30 and 31 ,. the outputs of which are connected to the inverters of the direction of movement (not shown in the diagram).

“The device works as follows.

Let MUK 3 be closed in its original state under the action of a permanent magnet field. In this case, a positive potential appears on one combined inputs of elements 12, 13, 22 and 23 - the logical unit "1", on the other inputs of these elements the potentials are equal to "0", and

There are no signals about the direction of movement. When moving a permanent magnet in the direction of the MUK 4 ("forward"), the latter closes, and the other input of the element 12 receives a positive impulse from the output of the differentiating circuit 10, and since the MUK 3 remains closed, the output of the element 12 and, accordingly, at the output of the element OR 30, a signal of the presence of a “forward” movement appears. With further movement of the “magnet” forward, the MUK 3 opens, the negative pulse from the output of the differentiating circuit 9 through the inverting element 25 enters the input of the element 14, and since a friend the input of this element has a “single” signal due to the fact that the MUK 4 is still closed, then at the output of the element OR 30 the signal of moving forward appears again. ' With further sequential activation of the MUK 5 and disabling of the MUK 4, similar signals appear at the outputs of the elements 15, 16 and OR 30, etc. If with the MUK 4 and MUK 5 closed, the monitored organ began to move "back", then when the MUK 5 is opened, the negative impulse from the output of the differentiating circuit 11 through the inverting element 28 enters the input element And 20, and since its other input due to the fact that the MUK 4 is closed, there is a "single" signal, then at the output of the element And 20, and, accordingly, the output of the element OR 31 appears on the presence of n remescheniya "back". On further moving the "back" closes MUK 3, 4 and the closed MUK displacement signal "naEad" appears at the outputs of AND element 21 and OR 31, etc.

Thus, the proposed device allows you to increase the amount of information about the direction of movement with a minimum number of sensitive elements of the sensor; to exclude the issuance of spurious signals about the movement, if the latter ceased immediately after the moment of issuing the signal about the movement, to receive information about the direction of movement in any number of discrete points with the same number of electrical elements included in the secondary circuit of the device.

. A particularly valuable application of the proposed device may be in digital information systems of a number of devices where, in the event of an emergency, high speeds of movement of regulatory bodies are required, and the operator must instantly determine the correct direction of movement of the regulator.

five

756205

6

Claims (2)

Claim A position sensor containing magnetically controlled contacts, a differentiating circuit, an insertion element, characterized in that, in order to improve the sensor accuracy, AND and OR elements, additional magnetically controlled contacts, differentiating circuits and inverting elements, magnetically controlled contacts are introduced into it, elements And are combined into groups of four, the first inputs of elements AND of each group are interconnected, the same magnetically controlled contacts of each group are interconnected and connected to waiting for the corresponding differentiating circuit and for the first inputs of elements AND of the corresponding group, the second input of the first elements AND of each group is connected to the output of the corresponding differentiating chain and through the corresponding inverting element with the second input of the third elements AND of each group, the second. 5 of each group is connected to the output of the corresponding differentiating circuit and to the second input of the second elements AND of each group, the outputs of the first and second elements AND each U groups are connected to the inputs of one OR element, and the outputs of the third and fourth elements AND of each group are connected to the inputs of another OR element. e Sources of Information taken into account in the examination 1. USSR author's certificate No. 341068, cl. From 08 to 9/08, 1968. 2. USSR author's certificate No. 402049, cl. C 08 C 9/04, 1971. 20 h. USSR author's certificate No. 597928, cl. C 01 0 5/25, 1976.