SU126714A1 - Periodic feed control device - Google Patents

Description

The device described below is a further improvement of the device for controlling the non-periodic feeding of planers for which the author has been issued. St. L 98977.

The improvement is in the use of a time-varying variconde relay, which is suitable for setting the load and ensuring that it is turned off by the engine. This achieves an increase in reliability and stability of the device.

FIG. 1 depicted; a schematic diagram of the counting-time node of the proposed device; in fig. 2 is a graph illustrating the nature of the increase in stress; in fig. 3 is a diagram of a contactless induction sensor; in fig. 4 is a diagram of the entire device.

The counting-time node contains a magnetic relay force. MUs, the power windings of which, having made a positive feedback, are fed at the same time, through the upper bridge, the load, which is the winding of the electromagnetic device FOR. The control winding of the magnetic amplifier is powered from a network of alternating current through a wiring bridge and a VM varicone bridge consisting of 4 identical varicands. A coil of an alternating current network n is connected to the horizontal diagonal of the bridge through the rectifying bridge to the control winding of the amplifier MU, and to the vertical diagonal through the separating valves Bi and B in parallel the capacitances C and Cs are connected. The capacitance Ci and the mean resistance RI form a temporary unit node of the device. When the D-1 contact is turned on, the voltage and r on the capacitance Ci will increase exponentially with a constant time R C, which varies with the position of the drag motor Ri (Fig. 2).

The capacitance C together with the contact switch PC., The capacitances C3 and C4 and the potentiometer I) forms the counting unit of the device. In the lower position of the PC, the capacitance Cz is charged to a potential, condition # 126714

The position of the potentiometer And, and then i) i the upper position of the PC transfers its charge capacity C-. The I / (switch is connected with the motor-to-dog feed, as a result of which the charge capacitance Cz will increase depending on the engine speed. The units of the device are designed in such a way that during normal operation the voltage on the capacitance of € 2 increases more rapidly than the voltage on the capacitor C, which is illustrated in Fig. 2. In connection with the entry of the dividing valves I and I, the potential in the diagonal of the varicoid bridge will be determined by the greatest potential of the capacitors, i.e. during normal operation, increasing in the number of engine speeds tel lodachi potential increase in capacity DC) voltage on a vertical 1atsr diagonal varikondovogo washes variconds capacity is also increased and the control winding current j vozrgyutaet magnetic amplifier. When the motor reaches a given number of revolutions, the magnitude of this current will become equal to the tripping current of the MU relay magnetic amplifier, as a result of which the current in the 9/1 aliarat winding will decrease, the EA will disconnect and the feed motor will be disconnected. At the same time, the relay / 7 svm with a normally-closed block-contact discharges the charges of the capacitances Cj and Cz, thus preparing the circuit for the next count.

If, for any reason, the counting node fails to work in a timely manner (for example, the PC switch fails), then the discontinuity of the node will no longer be performed as a function of the path, but as a function of the time due to an increase in the notice of the capacitance C of the time node. Thus, the counting unit of the device is operational, and the time node of the unit is 11zN1 protection.

The change in the iodachi value is achieved by simultaneously changing the position of the potentiometer I and the resistances, which are controlled by one handle and at the same time adjust the jet and time nodes to a new feed. In order to increase the reliability, the pe.ie // ehema works on shutdown.

In the proposed device, instead of a coaxial I / C switch, we can also use a non-contact induction sensor, the circuit of which is shown in the FNG. 3. A proximity sensor located at the feed motor shaft actuates a polarized relay, the contacts of which perform the role of a switch in the circuit.

FIG. Figure 4 shows the complete scheme of switching on the engine): an order and an acceleration of the displacement of the caliper of a longitudinal planing machine with a short-circuited asynchronous motor, dynamic braking, providing higher accuracy of nodachs, and the time-counting node described above. In this scheme, the load of the time-counting node is the revolving coitactors of // or I of the engine of the e-port, and the mode switch can switch the circuit to node to the left, iodine to the right or to fast-moving. In the latter case, the engine is turned on with the buttons "Fast left or" Fast right and the time it is turned on, and you determine the time you press these buttons.

In the case of supplying to the left (the contacts of the PR-1 and the PR-4 of the mode switch are closed) during a short circuit of the PC table switch, the winding turns on the supply of the magnetizing amplifier MU, the core of the latter is magnetized, the inductive resistance in the circuit of the power grids decreases and the contactor L turns on , turns on the engine iodachi in the direction of the left nodachi. At the same time, the contactor L locks the switch PX of the table stroke, and the supply turn-on winding remains W 11.11 chip. As the motor rotates, the PC switch, switching on its every turn, stepwise increases the potential of the capacitance Co, as a result of which a stepped increase in constant voltage is applied to the vertical diagonal of the hinged bridge. The capacitance of variconds increases and their resistance in the alternating current circuit decreases, in connection with which the control loop current increases, the current turns of which are directed oppositely to the current turn of the feed start winding and demagnetize the amplifier MU. Upon reaching the voltage on the capacitor From a certain value, the relay magnetic amplifier demagnetizes, thereby disconnecting the contactor L, which by its block-contact discharges the charges of the capacitances Cz and Cj, thus preparing the circuit for a new flow.

For the re-feed, the button “Re-feed” is provided, which acts similarly to the YaL switch. Re. РВ-} eliminates the possibility of double re-submission with a long press of the “Re-submission.

With the accelerated movement of the caliper, the mode switch closes the contacts of the PR-3 and opens the contacts of the PR-4, as a result of which the feed winding turns on, magnetizes the MD, and the control winding turns off. In this case, pressing the buttons “Fast left or“ Fast right turns on the contactor L or I and the motor for as long as the corresponding button is pressed.

The RV-2 relay provides io bypass time delay during dynamic engine braking.

Similarly, there is a flow to the right.

Subject invention

A device for controlling the periodic feeding of the planers in the aut. St. No. 98977, characterized in that, in order to increase the reliability and stability of the operation of the device, a counting-time varicode relay is used in it, which serves to set the feed rate and ensures a clear engine shutdown.

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