A machine tool delay start circuit with adjustable delay time

Abstract

The present invention discloses a machine tool delay start circuit with adjustable delay time, which includes an inverter circuit, a delay circuit, an amplifier circuit and an output circuit. The inverter circuit includes a PMOS transistor and an NMOS transistor. The source electrode of the PMOS transistor is connected to the control power supply, the drain electrode of the PMOS transistor is connected to the drain electrode of the NMOS transistor, and the gate electrodes of the PMOS transistor and the NMOS transistor are directly connected and connected to the positive electrode of the coil. The delay circuit includes a first resistor, a second resistor, a capacitor, a selection switch and a voltage stabilizing diode group. One end of the first resistor is connected to the source electrode of the PMOS transistor, and the other end is grounded. The second resistor and the capacitor are connected to form an RC circuit and are connected to the voltage stabilizing diode group through the selection switch. The present invention can realize the delay start of the machine tool, and the delay time can be set by itself.

Description

Technical Field

[0001] The present invention relates to a machine tool delay start circuit with adjustable delay time, belonging to the technical field of machine tool control. Background Art

[0002] There are generally two types of delay circuits: one is controlled by a mechanical structure, which delays through a micro motor decelerated by a gear structure. The disadvantage of this structure is that it is complex and relatively large in volume; the other is to delay through a chip. This control method is simple and efficient, and the timing is accurate, but this method is relatively expensive and is usually used in high-precision large-scale integrated circuits. Moreover, in the process of machine tool control, different machine tools have different delay start times. Therefore, it is necessary to design a machine tool delay start circuit with adjustable delay time that can be set by itself. Summary of the Invention

[0003] The purpose of the present invention is to provide a machine tool delay start circuit with adjustable delay time, which has a simple structure, flexible and convenient timing, and low cost, so as to achieve the purpose of delaying the start of the machine tool.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A machine tool delay start circuit with adjustable delay time includes an inverter circuit, a delay circuit, an amplifier circuit, and an output circuit. The inverter circuit includes a PMOS transistor and an NMOS transistor. The source of the PMOS transistor is connected to the control power supply, the drain of the PMOS transistor is connected to the drain of the NMOS transistor, and the gates of the PMOS transistor and the NMOS transistor are directly connected and connected to the positive pole of the coil; the delay circuit includes a first resistor, a second resistor, a capacitor, a selection switch, and a voltage regulator diode group. One end of the first resistor is connected to the source of the PMOS transistor, and the other end is grounded. The second resistor and the capacitor are connected to form an RC circuit and are connected to the voltage regulator diode group through the selection switch; the amplifier circuit includes a third resistor, a fourth resistor, a feedback resistor, and an operational amplifier. One end of the third resistor is connected to the voltage regulator diode group, and the other end is connected to the P terminal of the operational amplifier to form the input terminal of the operational amplifier. One end of the fourth resistor is connected to the N terminal of the operational amplifier, and the other end is grounded. A feedback resistor is connected between the N terminal and the output terminal of the operational amplifier; the output circuit includes a first contact, a second contact, a coil, a fifth resistor, and a light-emitting diode. The normally open contacts of the first contact are the input terminal and the output terminal respectively. The normally closed contact of the second contact is connected to the output terminal of the operational amplifier and the positive pole of the coil. The normally open contact of the second contact is connected to the control power supply. The fifth resistor and the light-emitting diode are connected in parallel between the positive and negative poles of the coil.

[0005] Further, the number of the voltage regulator diode groups is more than two.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention can achieve the delayed startup of the machine tool, and the delay time can be set by itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the circuit connection structure of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments.

[0009] Embodiment of the present invention: A schematic diagram of the structure of a machine tool delayed startup circuit with adjustable delay time is as Figure 1 shown, including an inverting circuit, a delay circuit, an amplifying circuit and an output circuit.

[0010] The inverting circuit includes a PMOS transistor T1 and an NMOS transistor T2. The source of the PMOS transistor T1 is connected to the control power supply E D connected, the drain of the PMOS transistor T1 is connected to the drain of the NMOS transistor T2, and the gates of the PMOS transistor T1 and the NMOS transistor T2 are directly connected and connected to the positive pole of the coil 3; the working principle of the inverting circuit is: when the gates of the PMOS transistor T1 and the NMOS transistor T2 are connected to a low level, the PMOS transistor T1 is turned on and the NMOS transistor T2 is turned off; when the gates are connected to a high level, the PMOS transistor T1 is turned off and the NMOS transistor T2 is turned on.

[0011] The delay circuit includes a first resistor R1, a second resistor R2, a capacitor C, a selection switch S and a voltage stabilizing diode group D. One end of the first resistor R1 is connected to the source of the PMOS transistor T1, and the other end is grounded. The second resistor R2 and the capacitor C are connected to form an RC circuit and are connected to the voltage stabilizing diode group D through the selection switch S; the number of the voltage stabilizing diode group D is more than two. In this embodiment, four voltage stabilizing diodes are provided in the voltage stabilizing diode group D, that is, the voltage stabilizing diode group D is composed of four voltage stabilizing diodes, namely a first voltage stabilizing diode D1, a second voltage stabilizing diode D2, a third voltage stabilizing diode D3 and a fourth voltage stabilizing diode D4. The working principle of the delay circuit: The second resistor R2 and the capacitor C jointly determine the charging and discharging speed of the capacitor. When the voltage of the capacitor C reaches the turn-on voltage of the voltage stabilizing diode during charging, the circuit is connected, and the time required at this time is the delay time. By the turn-on voltages of different voltage stabilizing diodes in the voltage stabilizing diode group D, plus the selection switch S, any delay time can be set as required.

[0012] The amplifier circuit includes a third resistor R3, a fourth resistor R4, a feedback resistor Rf, and an operational amplifier Y. One end of the third resistor R3 is connected to the voltage stabilizing diode group D, and the other end is connected to the P terminal of the operational amplifier Y to form the input terminal of the operational amplifier. One end of the fourth resistor R4 is connected to the N terminal of the operational amplifier Y, and the other end is grounded. A feedback resistor Rf is connected between the N terminal and the output terminal of the operational amplifier Y. The working principle of the amplifier circuit: the output voltage uo = (1 + Rf / R4) * the input voltage.

[0013] The output circuit includes a first contact 1, a second contact 2, a coil 3, a fifth resistor R5, and a light-emitting diode D5. The normally open contacts of the first contact 1 are respectively the input terminal IN and the output terminal OUT. The normally closed contact of the second contact 2 is connected to the output terminal of the operational amplifier Y and the positive pole of the coil 3, and the normally open contact of the second contact 2 is connected to the control power supply E D , and the fifth resistor R5 and the light-emitting diode D5 are connected in parallel across the positive and negative poles of the coil 3. The working principle of the output circuit: after the coil 3 is energized, the first contact 1 and the second contact 2 act, the normally open contacts close, and the normally closed contacts open.

[0014] The working principle of the present invention: after the control power supply E D is energized, since the voltages at the control electrodes of the PMOS transistor T1 and the NMOS transistor T2 are low levels at this time, the PMOS transistor T1 is turned on and the NMOS transistor T2 is turned off, and the current will pass through the PMOS transistor T1 and enter the delay circuit; after the power supply enters the delay circuit, it will charge the capacitor C, and the voltage of the capacitor C will continue to rise. According to the required delay time, one of the voltage stabilizing diodes in the voltage stabilizing diode group D is selected through the selection switch S. When the voltage of the capacitor C reaches the turn-on voltage of this voltage stabilizing diode, the circuit conducts; since the voltage is usually relatively low after being divided by the resistor and the voltage stabilizing diode, the voltage is amplified by the operational amplifier Y and then connected to the coil 3 of the output circuit. The voltage amplification factor is 1 + Rf / R4; after the coil 3 of the output circuit is energized, the light-emitting diode D5 will light up, the contacts act, the normally open contact of the first contact 1 closes to output a signal, the normally closed contact of the second contact 2 opens, the coil 3 of the output circuit is disconnected from the operational amplifier Y, and the normally open contact closes, connecting the coil 3 and the control power supply E D to form a self-lock. At the same time, the voltages at the control electrodes of the PMOS transistor T1 and the NMOS transistor T2 are high levels, so the PMOS transistor T1 is turned off and the NMOS transistor T2 is turned on, and the capacitor C starts to discharge. Therefore, the present invention can realize the delayed start of the machine tool, and the delay time can be set by itself.

Claims

1. A machine tool delay start circuit with adjustable delay time, comprising an inverter circuit, a delay circuit, an amplifier circuit and an output circuit, Characterized in that: The inverting circuit includes a PMOS transistor (T1) and an NMOS transistor (T2). The source of the PMOS transistor (T1) is connected to the control power supply (E D ). The drain of the PMOS transistor (T1) is connected to the drain of the NMOS transistor (T2). The gates of the PMOS transistor (T1) and the NMOS transistor (T2) are directly connected and connected to the positive pole of the coil (3). The delay circuit includes a first resistor (R1), a second resistor (R2), a capacitor (C), a selection switch (S), and a voltage regulator diode group (D). One end of the first resistor (R1) is connected to the source of the PMOS transistor (T1), and the other end is grounded. The second resistor (R2) and the capacitor (C) are connected to form an RC circuit and are connected to one of the voltage regulator diodes in the voltage regulator diode group (D) through the selection switch (S). The turn-on voltages of different voltage regulator diodes in the voltage regulator diode group (D) are different. The amplifying circuit includes a third resistor (R3), a fourth resistor (R4), a feedback resistor (Rf), and an operational amplifier (Y). One end of the third resistor (R3) is connected to the voltage regulator diode group (D), and the other end is connected to the P terminal of the operational amplifier (Y) to form the input terminal of the operational amplifier. One end of the fourth resistor (R4) is connected to the N terminal of the operational amplifier (Y), and the other end is grounded. A feedback resistor (Rf) is connected between the N terminal and the output terminal of the operational amplifier (Y). The output circuit includes a first contact (1), a second contact (2), a coil (3), a fifth resistor (R5), and a light-emitting diode (D5). The normally open contacts of the first contact (1) are the input terminal (IN) and the output terminal (OUT) respectively. The normally closed contact of the second contact (2) is connected to the output terminal of the operational amplifier (Y) and the positive pole of the coil (3). The normally open contact of the second contact (2) is connected to the control power supply (E D ). The fifth resistor (R5) and the light-emitting diode (D5) are connected in parallel across the positive and negative poles of the coil (3).

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