SU729674A1 - Switching apparatus - Google Patents

Description

The invention relates to automation, in particular to devices in which the accuracy of command voltage generation is high. Switching devices are known, which have cams with protrusions installed with the possibility of interaction with microswitches 1. Switching devices are also known that contain a cam with a knocker,. kinematically connected with a driver and mounted to interact with the microswitch, with a break contact through a spring-loaded pusher, and a relay, the winding of which through the break switch of the microswitch is connected to a power source, and the closure contact of the relay is connected to the Control Signals 2 circuit. A disadvantage of the known switching devices is the presence of the characteristics of the hysteresis type, which does not allow to obtain a high accuracy of the switching device, The purpose of the invention is to improve the accuracy of the switching device. This is achieved by switching a cam with a protrusion, kinematically connected with a master unit and mounted to interact with a microswitch with a break contact through a spring-loaded plunger, and a relay that winds through the breaker contact of the microswitch is connected to a power source, the closing contact of the relay is included in the control signal circuit, provided with an additional spring-loaded pusher located diametrically opposed to the said spring-loaded an oscillator, a micro switch with a closing contact and two more relays, the cam is made with an additional protrusion, the winding of the second relay is connected to the power source through its own closing contact, connected in series with the closing contact of the relay, and also through the closing contact of the third relay, the winding of which is connected to the power supply through the E-switch of the microswitch, and the other closing contact of the second relay fi the opening contact of the third relay are also included in the control signal circuit, with the opening The third contact of the third relay is connected in series with the closing contact of the relay, in parallel with which another closing contact of the second relay is connected. Fig. 1 shows a switching device diagram for the case of generating a voltage — a command while decreasing the "argument in Fig. 2." state diagram of a switching device for the case of generating a command voltage while decreasing the argument; FIG. 3 is a diagram of a switching device for the case of generating a command voltage while increasing the argument; Fig. 4 is a state diagram of a switching device for the case of generating a command voltage with increasing argument y. The shaded parts correspond to the on state of the relay and are closed to the contacts. The switching device contains a cam 1 with two lugs, a microswitch 2 with a disconnecting contact, a microswitch 3 with a closing contact, a spring-loaded pusher 4, interacting with a microswitch with opening contact, a spring-loaded pusher 5, interacting with the microswitch with a closing contact, relay 6, the second relay 7 and the third relay 8, relay b has an opening contact 9 and a closing contact 10, the second relay 7 has closing contacts 11 and 12, the third relay 8 has a closing contact 13 and the opening contact 14, the control circuit Contacts 10,12,14 form the driving signal. Spring-loaded pushers are diametrically opposed, thanks to this, microswitches for paaNSJKa are actuated at the same value of the cam shaft rotation angle (). The required installation accuracy of the tappets is provided by the adjustment of the device. The angle of rotation of your cam H 4 corresponds to the closing of the microswitch 2 by rotating the cam clockwise (), the angle of rotation of the cam shaft corresponds to the closing of the microswitch 3 by rotating the cam against the clock hand (“i O). Line AB is the axis of symmetry of the cam D In the case of generating a control signal with a decrease in the argument, the device works as follows (see Figures 1 and 2). Initial state cxeNbi: 4 O, micro switch 2 closed, and micro switch. 3 open. When this relay 6 is turned on, the second relay 7 and the third relay 8 are de-energized. The command voltage through the closing contact 10 of relay b and the opening contact 14 of the de-energized third relay 8 is fed to the output of the device. This device state is maintained until. as long as the argument h is less than g. When moving the cam counterclockwise in the direction of increasing the argument M (), when H 1 g. microswitch 2 is opened, relay b is de-energized and its contacts 10 breaks the command circuit. At the output of the device, the command voltage is removed -. This state of the device is maintained for as long as H, at M-c 413, microswitch 3 closes and the third relay 8 is triggered, which connects relay 7 to the power source with its closing contact 13. The second relay 7 is turned on, and although the closing contact 12 is closed, but the command voltage to the device output is not received, since the contact 14 of the third relay 8 turned on has previously broken the command circuit. This state of the device is maintained for all (reverse cam movement clockwise () the previous state of the device is maintained to H when the microswitch opens. 3, which turns off the third relay 8. The second relay 7 remains on, because through its pin 11 and contact 9 of the de-energized relay b, the winding of the second relay 7 remains connected to the power source. The command voltage goes to the output of the device via the contact 12 of the second relay 7 and the contact 14 of the de-energized third relay 8. This state of the switching device After the cam moves further, when microswitch 2 closes, turning on relay 6, contact 9 of which breaks the power supply circuit of the second relay 7. However, the control signal circuit does not break as soon as contact 10 of relay b, and only then the contact 12 of the de-energized second relay 7 is opened. This state of the device is maintained for all. Thus, the operation of the switching device is expressed by the equation Yie | W at 4 O in the case of a control voltage velichenii otsegumeita W device operates as follows (see. FIG. 3 and 4). The initial state of the circuit: 4 O, microswitch 2 is closed, and microswitch 3 is open, the third relay 8 is on and its second terminal 7 is turned on the second relay 7, the relay 6 is de-energized, the control voltage does not pass to the circuit output as contact J4 of the activated third relay 8 is open. This state of the device is maintained until the argument i Mj When the cam moves upwards, the argument counterclockwise (), if If microswitch 2 opens, the third relay 8 de-energizes, but the second relay 7 remains in the same state since the voltage of the power source through the contact 9 of the de-energized relay b and the contact 11 of the switched on second relay 7 is applied to the winding of the second relay 7, i.e. re 7 is self blocking. The voltage of the command passes to in, the device travels through contact 12 of the included second relay 7 and contact. 14 de-energized third relay 8, This state of the device remains as long as 1 Hz. With further movement of the drive shaft, the moment C "is closed from the microswitch J, turning on the relay b, which by its contact 9 disconnects the power supply circuit of the second relay 7. Circuit the commands are not interrupted, since first, the contact 10 of the relay 6 is turned on, and only then the second relay 7 is de-energized, breaking up the previous command circuit with its contacts 12. Such a state of the device is maintained for all f. When the cam moves backwards along the chaos arrow (Q) o), the previous state of the device remains until. At this point, microswitch 3 is turned off, which turns off relay b, pins 10 of which break the command circuit. Such a state of the device is maintained until 4, With further cam movements when the switch is closed, microswitch 2, which turns on the third relay 8, contacts 13 of which connect the winding of the second relay 7 to the power source. The command does not pass to the device output, since the contacts 14 of the switched on third relay 8 are first opened, and only then the contacts 12 of the switched on second relay 7 are turned on. This state of the device is maintained for everyone. Thus, the operation of the switching device in this case is expressed 1) With the equation AND HE when the device can also work with two cams mounted on one shaft, each of which has one working ledge. The presence of two working protrusions in the device (either on one cam or one on two) is necessary for operation of the device with two microswitches. Thus, the input – output characteristics of the switching device turned out without a hysteresis loop. Elimination of hysteresis occurred through the application of a logic circuit built on three relays and two microswitches. "Invention Switching device containing a cam with a protrusion, kinematically connected with a master unit and installed with the ability to interact with a microswitch with a break contact through a sub spring | a relay, the winding of which through the disconnecting contact of the microswitch is connected to the power source, and the closing contact of the relay is connected to the control circuit of the CHI circuit, which In order to increase accuracy, it is equipped with an additional spring-loaded pusher located diametrically opposite to the mentioned spring-loaded pusher, a micro switch with closing contact and two more relays, the cam is made with an additional protrusion, the winding of the second relay is connected to the power source through its closure contact connected in series with the break contact of the relay, as well as through the closing contact of the third relay, the winding of which is connected to the pita-1 source. (I through the closing the microswitch contact, and the other closing contact of the second relay and the opening contact of the third relay are also included in the control signal circuit, while the opening contact of the third relay is connected in series with the closing contact of the relay, in parallel with which another Opening contact of the second relay is connected. Sources of information taken into account in the examination 1. US patent number 2828372 kl.200-17, 1958. 2. The device used in the product 1RL39, Technical Description BG2.R76.068 TO, g, Yoshkar-Ola.

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Claims (1)

Claim A switching device containing a cam with a protrusion kinematically connected to the master and installed to interact with the microswitch with the opening contact via a spring-loaded plunger, and a relay whose winding is connected to the power source through the opening contact of the micro switch and the closing contact · relay is connected to the control circuit sin - nala, characterized in that, in order to increase accuracy, it is equipped with an additional spring-loaded pusher located diametrically opposite to said valuable pusher, a microswitch with a make contact and two more relays, the cam is made with an additional protrusion, the winding of the second relay is connected to the power source through its make contact, connected in series / connected to the make contact of the relay, and also through the make contact of the third relay, whose winding connected to the power source through the make contact of the microswitch, and the other make contact of the second relay and the make contact of the third relay are also included in the control circuit, signal, while the NC contact of the third relay is connected in series with the NC contact of the relay. ’Parallel to which another NO contact of the second relay is connected.