CN104898552A - Closed-Loop machine tool control system based on precise positioning - Google Patents
Closed-Loop machine tool control system based on precise positioning Download PDFInfo
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- CN104898552A CN104898552A CN201510144190.9A CN201510144190A CN104898552A CN 104898552 A CN104898552 A CN 104898552A CN 201510144190 A CN201510144190 A CN 201510144190A CN 104898552 A CN104898552 A CN 104898552A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/19—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
Abstract
The invention discloses a closed-Loop machine tool control system based on precise positioning, which is characterized by comprises a comparison module (1), a servo amplification module (2) connected with the comparison module (1), a driving device (3) connected with the servo amplification module (2), a machine tool working table (4) connected with the driving device (3), a detection device (5) connected with the machine tool working table (4), and a feedback signal processing system (6) connected with the detection device (5). The feedback signal processing system of the invention is provided with a suppression circuit, interference signals can be suppressed, influences of the interference signals on feedback signals can be avoided, feedback signals received by the comparison module are more precise, and the positioning precision of the machine tool is improved.
Description
Technical field
The present invention relates to electronic applications, specifically refer to a kind of based on pinpoint closed loop machine tool control system.
Background technology
In recent years, because market competition is growing more intense, in order to try to achieve survival and development in competition, the quality of product not only will improve in each manufacturing enterprise, and must retrofit frequently, shortens the production cycle, to meet the demand of constantly change on market.But a lot of enterprise uses traditional process equipment to produce at present, and its positioning precision of traditional equipment is not good, reduces the qualification rate of throughput rate, product when producing to a great extent.Therefore traditional process equipment has been difficult to adapt to market to the requirement of product diversity, is difficult to adapt to the high-level efficiency of market competition, high-quality requirement.How improving the positioning precision of process equipment, is then people institute urgent problem to enhance productivity with the qualification rate of product.
Summary of the invention
The object of the invention is to solve the not good defect of current used machine tool positioning precision, provide a kind of based on pinpoint closed loop machine tool control system.
Object of the present invention is by following technical proposals reality: a kind of based on pinpoint closed loop machine tool control system, by comparison module, the servo amplification module be connected with comparison module, the drive unit be connected with servo amplification module, the platen be connected with drive unit, the pick-up unit be connected with platen, and the feedback signal disposal system be connected with pick-up unit forms.Described feedback signal disposal system is then by transformer T1, transformer T2, be arranged on the telefault L4 on the former limit of transformer T1, be arranged on the telefault L5 of transformer T1 secondary, be arranged on telefault L1 and the telefault L2 on the former limit of transformer T2, be arranged on the telefault L3 of transformer T2 secondary, the turning circuit be connected with telefault L2 with transformer T2 former limit telefault L1, the rectification filtering voltage stabilizing circuit be connected with transformer T1 secondary inductance coil L5, the suppression circuit be connected with the secondary inductance coil L3 of transformer T2, with rectification filtering voltage stabilizing circuit and the pulsed triggering circuit suppressing circuit to be connected, with the output processing circuit suppressing circuit to be connected, and form with the two-stage amplifying circuit suppressing circuit to be connected with output processing circuit simultaneously.
Further, described turning circuit is by thyristor D1, thyristor D2, the resistance R1 that one end is connected with the P pole of thyristor D1, the other end is then connected with the Same Name of Ends of transformer T1 former limit telefault L4, the diode D3 that N pole is connected with the control pole of thyristor D2, P pole is then connected with the non-same polarity of transformer T2 former limit telefault L1, the diode D4 that N pole is connected with the N pole of thyristor D1, P pole is then connected with the non-same polarity of the former limit telefault L2 of transformer T2 forms.The P pole of described thyristor D1 is connected with the Same Name of Ends of transformer T2 former limit telefault L1, it controls, and pole is then connected with the Same Name of Ends of the former limit telefault L2 of transformer T2, N pole is then connected with the non-same polarity of transformer T1 former limit telefault L4, and the N pole of thyristor D2 is connected with the P pole of thyristor D1, its P pole is then connected with the N pole of thyristor D1.
Described rectification filtering voltage stabilizing circuit is by diode bridge rectifier U, and polar capacitor C1, resistance R2, voltage stabilizing diode D5 form, two input ends of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T1 secondary inductance coil L5 respectively, two output terminal is then connected with negative pole with the positive pole of polar capacitor C1 respectively, one end of resistance R2 is connected with the positive pole of polar capacitor C1, the other end is then connected with the N pole of voltage stabilizing diode D5, and the N pole of voltage stabilizing diode D5 is also connected with pulsed triggering circuit, P pole is then connected with the negative pole of polar capacitor C1 and pulsed triggering circuit simultaneously, the positive pole of described polar capacitor C1 is also connected with the Same Name of Ends of transformer T2 secondary inductance coil L3.
Described suppression circuit is by field effect transistor Q, triode VT3, one end is connected with the grid of field effect transistor Q, the resistance R6 that the other end is connected with pulsed triggering circuit, negative pole is connected with the grid of field effect transistor Q, the polar capacitor C2 that positive pole is then connected with pulsed triggering circuit, one end is connected with the positive pole of polar capacitor C2, the resistance R7 of other end ground connection, P pole is connected with the base stage of triode VT3, the voltage stabilizing diode D6 that N pole is then connected with non-same polarity and the external power source of transformer T2 secondary inductance coil L3 simultaneously, one end is connected with the N pole of voltage stabilizing diode D6, the resistance R8 that the other end is connected with the emitter of triode VT3 forms, the base stage of described triode VT3 is connected with the positive pole of polar capacitor C2, its emitter is then connected with output processing circuit, collector is connected with the source electrode of field effect transistor Q, and the drain electrode of field effect transistor Q is then connected with two-stage amplifying circuit.
Described pulsed triggering circuit is by triode VT1, triode VT2, the resistance R3 that one end is connected with the N pole of voltage stabilizing diode D5, the other end is then connected with the emitter of triode VT1, the resistance R4 that one end is connected with the base stage of triode VT2, the other end is then connected with the emitter of triode VT2 after resistance R5 forms; The base stage of described triode VT1 is connected with the positive pole of polar capacitor C2, collector is connected with the tie point of resistance R5 with resistance R4, and the collector of triode VT2 is connected with the non-same polarity of transformer T2 secondary inductance coil L3, emitter is then connected with the P pole of voltage stabilizing diode D5 and resistance R6 simultaneously.
Described output processing circuit is by triode VT4, triode VT5, one end is connected with the emitter of triode VT4, the resistance R9 that the other end is connected with two-stage amplifying circuit, positive pole is connected with the N pole of voltage stabilizing diode D6, the polar capacitor C8 of minus earth, positive pole is connected with the emitter of triode VT4, the polar capacitor C9 that negative pole is then connected with the base stage of triode VT5, positive pole is connected with two-stage amplifying circuit, negative pole is then in turn through polar capacitor C10 that resistance R14 is connected with the base stage of triode VT5 after resistance R12, N pole is connected with the positive pole of polar capacitor C8, the voltage stabilizing diode D7 of P pole ground connection, positive pole is connected with the N pole of voltage stabilizing diode D7, the polar capacitor C11 that negative pole is then connected with two-stage amplifying circuit, and one end is connected with the positive pole of polar capacitor C8, the resistance R13 that the other end is then connected with the collector of triode VT5 forms, the base stage of described triode VT4 is connected with the emitter of triode VT3, its grounded collector, and the collector of triode VT5 is connected with the tie point of resistance R14 with resistance R12, emitter is then connected with two-stage amplifying circuit.
Described two-stage amplifying circuit is by amplifier P1, amplifier P2, triode VT6, triode VT7, negative pole is connected with the drain electrode of field effect transistor Q, the polar capacitor C3 that positive pole is then connected with resistance R9, one end is connected with the positive pole of polar capacitor C3, the resistance R10 that the other end is connected with the positive pole of amplifier P1, minus earth, the polar capacitor C4 that positive pole is then connected with the negative pole of amplifier P1 after resistance R11, positive pole is connected with the negative pole of amplifier P1, the polar capacitor C5 that negative pole is then connected with the output stage of amplifier P1, negative pole is connected with the output stage of amplifier P1, the polar capacitor C6 that positive pole is then connected with the base stage of triode VT6, positive pole is connected with the negative pole of amplifier P2, the polar capacitor C7 that negative pole is then connected with the emitter of triode VT6, be serially connected in the resistance R15 between the negative pole of amplifier P2 and output stage, one end is connected with the emitter of triode VT7, the resistance R16 that the other end is connected with the negative pole of polar capacitor C7 forms, the collector of described triode VT6 is connected with the emitter of triode VT5, the positive pole of amplifier P2 is connected with the positive pole of polar capacitor C10, output stage is then connected with the base stage of triode VT7, and the collector of triode VT7 is connected with the negative pole of polar capacitor C11.
The present invention compared with prior art has the following advantages and beneficial effect:
1, feedback signal disposal system of the present invention is provided with suppression circuit, and it can suppress undesired signal, avoids interference signal and impacts feedback signal, makes the feedback signal received by comparison module more accurate, improves the positioning precision of lathe.
2, the present invention adopts closed-loop control system, makes that the positioning precision of lathe is higher, governing speed is faster.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is feedback signal disposal system electrical block diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, the present invention is by comparison module 1, the servo amplification module 2 be connected with comparison module 1, the drive unit 3 be connected with servo amplification module 2, the platen 4 be connected with drive unit 3, the pick-up unit 5 be connected with platen 4, and the feedback signal disposal system 6 be connected with pick-up unit 5 forms.
During work, a fixed pulse signal is inputted to comparison module 1, flowed to after servo amplification module 2 amplifies by comparison module 1 and flow to drive unit 3 again, drive unit 3 can drive platen 4 according to the size of pulse signal, makes platen 4 move to corresponding position as requested.Pick-up unit 5 then for detecting the position signalling of platen 4, and feeds back to feedback signal disposal system 6 position signalling and processes.Position signalling after feedback signal disposal system 6 processes is transferred to comparison module 1 again, this position signalling then compares with given pulse command, if there is error in the current location of lathe and given pulse signal, then can again send a signal to drive unit 3, further platen 4 is controlled, make platen 4 according to the requirement campaign of reality, final realization is accurately located.
In order to make the position signalling after feedback signal disposal system 6 processes more clear, and there is very high fidelity, this feedback signal disposal system 6 as shown in Figure 2, by the transformer T1 for transformation, transformer T2, be arranged on the telefault L4 on the former limit of transformer T1, be arranged on the telefault L5 of transformer T1 secondary, be arranged on telefault L1 and the telefault L2 on the former limit of transformer T2, be arranged on the telefault L3 of transformer T2 secondary, the turning circuit 61 be connected with telefault L2 with transformer T2 former limit telefault L1, the rectification filtering voltage stabilizing circuit 62 be connected with transformer T1 secondary inductance coil L5, the suppression circuit 63 be connected with the secondary inductance coil L3 of transformer T2, with rectification filtering voltage stabilizing circuit 62 and the pulsed triggering circuit 64 suppressing circuit 63 to be connected, with the output processing circuit 65 suppressing circuit 63 to be connected, and form with the two-stage amplifying circuit 66 suppressing circuit 63 to be connected with output processing circuit 65 simultaneously.
Wherein, this turning circuit 61 is by thyristor D1, thyristor D2, the resistance R1 that one end is connected with the P pole of thyristor D1, the other end is then connected with the Same Name of Ends of transformer T1 former limit telefault L4, the diode D3 that N pole is connected with the control pole of thyristor D2, P pole is then connected with the non-same polarity of transformer T2 former limit telefault L1, the diode D4 that N pole is connected with the N pole of thyristor D1, P pole is then connected with the non-same polarity of the former limit telefault L2 of transformer T2 forms; The P pole of described thyristor D1 is connected with the Same Name of Ends of transformer T2 former limit telefault L1, it controls, and pole is then connected with the Same Name of Ends of the former limit telefault L2 of transformer T2, N pole is then connected with the non-same polarity of transformer T1 former limit telefault L4, and the N pole of thyristor D2 is connected with the P pole of thyristor D1, its P pole is then connected with the N pole of thyristor D1.
Rectification filtering voltage stabilizing circuit 62 then can carry out rectifying and wave-filtering process to position signalling, and it is by diode bridge rectifier U, polar capacitor C1, resistance R2, and voltage stabilizing diode D5 forms.During connection, two input ends of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T1 secondary inductance coil L5 respectively, two output terminal is then connected with negative pole with the positive pole of polar capacitor C1 respectively, one end of resistance R2 is connected with the positive pole of polar capacitor C1, the other end is then connected with the N pole of voltage stabilizing diode D5, and the N pole of voltage stabilizing diode D5 is also connected with pulsed triggering circuit 64, P pole is then connected with the negative pole of polar capacitor C1 and pulsed triggering circuit 64 simultaneously, the positive pole of described polar capacitor C1 is also connected with the Same Name of Ends of transformer T2 secondary inductance coil L3.
In addition, suppress circuit 63 can suppress undesired signal, make the fidelity of position signalling higher, it is by field effect transistor Q, triode VT3, resistance R6, resistance R7, resistance R8, polar capacitor C2, and voltage stabilizing diode D6 forms.One end of resistance R6 is connected with the grid of field effect transistor Q, the other end is connected with pulsed triggering circuit 64, the negative pole of polar capacitor C2 is connected with the grid of field effect transistor Q, positive pole is then connected with pulsed triggering circuit 64, one end of resistance R7 is connected with the positive pole of polar capacitor C2, other end ground connection, the P pole of voltage stabilizing diode D6 is connected with the base stage of triode VT3, N pole connects outside 5V voltage while being then connected with the non-same polarity of transformer T2 secondary inductance coil L3, one end of resistance R8 is connected with the N pole of voltage stabilizing diode D6, the other end is connected with the emitter of triode VT3, simultaneously, the base stage of triode VT3 is connected with the positive pole of polar capacitor C2, its emitter is then connected with output processing circuit 65, collector is connected with the source electrode of field effect transistor Q, the drain electrode of field effect transistor Q is then connected with two-stage amplifying circuit 66.
Pulsed triggering circuit 64 is by triode VT1, triode VT2, the resistance R3 that one end is connected with the N pole of voltage stabilizing diode D5, the other end is then connected with the emitter of triode VT1, the resistance R4 that one end is connected with the base stage of triode VT2, the other end is then connected with the emitter of triode VT2 after resistance R5 forms.The base stage of described triode VT1 is connected with the positive pole of polar capacitor C2, collector is connected with the tie point of resistance R5 with resistance R4, and the collector of triode VT2 is connected with the non-same polarity of transformer T2 secondary inductance coil L3, emitter is then connected with the P pole of voltage stabilizing diode D5 and resistance R6 simultaneously.
Output processing circuit 65 is by triode VT4, triode VT5, one end is connected with the emitter of triode VT4, the resistance R9 that the other end is connected with two-stage amplifying circuit 66, positive pole is connected with the N pole of voltage stabilizing diode D6, the polar capacitor C8 of minus earth, positive pole is connected with the emitter of triode VT4, the polar capacitor C9 that negative pole is then connected with the base stage of triode VT5, positive pole is connected with two-stage amplifying circuit 66, negative pole is then in turn through polar capacitor C10 that resistance R14 is connected with the base stage of triode VT5 after resistance R12, N pole is connected with the positive pole of polar capacitor C8, the voltage stabilizing diode D7 of P pole ground connection, positive pole is connected with the N pole of voltage stabilizing diode D7, the polar capacitor C11 that negative pole is then connected with two-stage amplifying circuit 66, and one end is connected with the positive pole of polar capacitor C8, the resistance R13 that the other end is then connected with the collector of triode VT5 forms, the base stage of described triode VT4 is connected with the emitter of triode VT3, its grounded collector, and the collector of triode VT5 is connected with the tie point of resistance R14 with resistance R12, emitter is then connected with two-stage amplifying circuit 66.
Two-stage amplifying circuit 66 can carry out amplification process to position signalling, makes signal more clear.It is by amplifier P1, amplifier P2, triode VT6, triode VT7, negative pole is connected with the drain electrode of field effect transistor Q, the polar capacitor C3 that positive pole is then connected with resistance R9, one end is connected with the positive pole of polar capacitor C3, the resistance R10 that the other end is connected with the positive pole of amplifier P1, minus earth, the polar capacitor C4 that positive pole is then connected with the negative pole of amplifier P1 after resistance R11, positive pole is connected with the negative pole of amplifier P1, the polar capacitor C5 that negative pole is then connected with the output stage of amplifier P1, negative pole is connected with the output stage of amplifier P1, the polar capacitor C6 that positive pole is then connected with the base stage of triode VT6, positive pole is connected with the negative pole of amplifier P2, the polar capacitor C7 that negative pole is then connected with the emitter of triode VT6, be serially connected in the resistance R15 between the negative pole of amplifier P2 and output stage, one end is connected with the emitter of triode VT7, the resistance R16 that the other end is connected with the negative pole of polar capacitor C7 forms.The collector of described triode VT6 is connected with the emitter of triode VT5, the positive pole of amplifier P2 is connected with the positive pole of polar capacitor C10, output stage is then connected with the base stage of triode VT7, the collector of triode VT7 is connected with the negative pole of polar capacitor C11, and the positive pole of polar capacitor C11 and the negative pole of polar capacitor C7 are then as the output terminal of signal.
As mentioned above, just well the present invention can be realized.
Claims (7)
1. one kind based on pinpoint closed loop machine tool control system, it is characterized in that: by comparison module (1), the servo amplification module (2) be connected with comparison module (1), the drive unit (3) be connected with servo amplification module (2), the platen (4) be connected with drive unit (3), the pick-up unit (5) be connected with platen (4), and the feedback signal disposal system (6) be connected with pick-up unit (5) forms, described feedback signal disposal system (6) is then by transformer T1, transformer T2, be arranged on the telefault L4 on the former limit of transformer T1, be arranged on the telefault L5 of transformer T1 secondary, be arranged on telefault L1 and the telefault L2 on the former limit of transformer T2, be arranged on the telefault L3 of transformer T2 secondary, the turning circuit (61) be connected with telefault L2 with transformer T2 former limit telefault L1, the rectification filtering voltage stabilizing circuit (62) be connected with transformer T1 secondary inductance coil L5, the suppression circuit (63) be connected with the secondary inductance coil L3 of transformer T2, with rectification filtering voltage stabilizing circuit (62) and the pulsed triggering circuit (64) suppressing circuit (63) to be connected, with the output processing circuit (65) suppressing circuit (63) to be connected, and form with the two-stage amplifying circuit (66) suppressing circuit (63) to be connected with output processing circuit (65) simultaneously.
2. one according to claim 1 is based on pinpoint closed loop machine tool control system, it is characterized in that: described turning circuit (61) is by thyristor D1, thyristor D2, one end is connected with the P pole of thyristor D1, the resistance R1 that the other end is then connected with the Same Name of Ends of transformer T1 former limit telefault L4, N pole is connected with the control pole of thyristor D2, the diode D3 that P pole is then connected with the non-same polarity of transformer T2 former limit telefault L1, N pole is connected with the N pole of thyristor D1, the diode D4 that P pole is then connected with the non-same polarity of the former limit telefault L2 of transformer T2 forms, the P pole of described thyristor D1 is connected with the Same Name of Ends of transformer T2 former limit telefault L1, it controls, and pole is then connected with the Same Name of Ends of the former limit telefault L2 of transformer T2, N pole is then connected with the non-same polarity of transformer T1 former limit telefault L4, and the N pole of thyristor D2 is connected with the P pole of thyristor D1, its P pole is then connected with the N pole of thyristor D1.
3. one according to claim 2 is based on pinpoint closed loop machine tool control system, it is characterized in that: described rectification filtering voltage stabilizing circuit (62) is by diode bridge rectifier U, and polar capacitor C1, resistance R2, voltage stabilizing diode D5 form, two input ends of diode bridge rectifier U are connected with non-same polarity with the Same Name of Ends of transformer T1 secondary inductance coil L5 respectively, two output terminal is then connected with negative pole with the positive pole of polar capacitor C1 respectively, one end of resistance R2 is connected with the positive pole of polar capacitor C1, the other end is then connected with the N pole of voltage stabilizing diode D5, and the N pole of voltage stabilizing diode D5 is also connected with pulsed triggering circuit (64), P pole is then connected with the negative pole of polar capacitor C1 and pulsed triggering circuit (64) simultaneously, the positive pole of described polar capacitor C1 is also connected with the Same Name of Ends of transformer T2 secondary inductance coil L3.
4. one according to claim 3 is based on pinpoint closed loop machine tool control system, it is characterized in that: described suppression circuit (63) is by field effect transistor Q, triode VT3, one end is connected with the grid of field effect transistor Q, the resistance R6 that the other end is connected with pulsed triggering circuit (64), negative pole is connected with the grid of field effect transistor Q, the polar capacitor C2 that positive pole is then connected with pulsed triggering circuit (64), one end is connected with the positive pole of polar capacitor C2, the resistance R7 of other end ground connection, P pole is connected with the base stage of triode VT3, the voltage stabilizing diode D6 that N pole is then connected with non-same polarity and the external power source of transformer T2 secondary inductance coil L3 simultaneously, one end is connected with the N pole of voltage stabilizing diode D6, the resistance R8 that the other end is connected with the emitter of triode VT3 forms, the base stage of described triode VT3 is connected with the positive pole of polar capacitor C2, its emitter is then connected with output processing circuit (65), collector is connected with the source electrode of field effect transistor Q, and the drain electrode of field effect transistor Q is then connected with two-stage amplifying circuit (66).
5. one according to claim 4 is based on pinpoint closed loop machine tool control system, it is characterized in that: described pulsed triggering circuit (64) is by triode VT1, triode VT2, the resistance R3 that one end is connected with the N pole of voltage stabilizing diode D5, the other end is then connected with the emitter of triode VT1, the resistance R4 that one end is connected with the base stage of triode VT2, the other end is then connected with the emitter of triode VT2 after resistance R5 forms; The base stage of described triode VT1 is connected with the positive pole of polar capacitor C2, collector is connected with the tie point of resistance R5 with resistance R4, and the collector of triode VT2 is connected with the non-same polarity of transformer T2 secondary inductance coil L3, emitter is then connected with the P pole of voltage stabilizing diode D5 and resistance R6 simultaneously.
6. one according to claim 5 is based on pinpoint closed loop machine tool control system, it is characterized in that: described output processing circuit (65) is by triode VT4, triode VT5, one end is connected with the emitter of triode VT4, the resistance R9 that the other end is connected with two-stage amplifying circuit (66), positive pole is connected with the N pole of voltage stabilizing diode D6, the polar capacitor C8 of minus earth, positive pole is connected with the emitter of triode VT4, the polar capacitor C9 that negative pole is then connected with the base stage of triode VT5, positive pole is connected with two-stage amplifying circuit (66), negative pole is then in turn through polar capacitor C10 that resistance R14 is connected with the base stage of triode VT5 after resistance R12, N pole is connected with the positive pole of polar capacitor C8, the voltage stabilizing diode D7 of P pole ground connection, positive pole is connected with the N pole of voltage stabilizing diode D7, the polar capacitor C11 that negative pole is then connected with two-stage amplifying circuit (66), and one end is connected with the positive pole of polar capacitor C8, the resistance R13 that the other end is then connected with the collector of triode VT5 forms, the base stage of described triode VT4 is connected with the emitter of triode VT3, its grounded collector, and the collector of triode VT5 is connected with the tie point of resistance R14 with resistance R12, emitter is then connected with two-stage amplifying circuit (66).
7. one according to claim 6 is based on pinpoint closed loop machine tool control system, it is characterized in that: described two-stage amplifying circuit (66) is by amplifier P1, amplifier P2, triode VT6, triode VT7, negative pole is connected with the drain electrode of field effect transistor Q, the polar capacitor C3 that positive pole is then connected with resistance R9, one end is connected with the positive pole of polar capacitor C3, the resistance R10 that the other end is connected with the positive pole of amplifier P1, minus earth, the polar capacitor C4 that positive pole is then connected with the negative pole of amplifier P1 after resistance R11, positive pole is connected with the negative pole of amplifier P1, the polar capacitor C5 that negative pole is then connected with the output stage of amplifier P1, negative pole is connected with the output stage of amplifier P1, the polar capacitor C6 that positive pole is then connected with the base stage of triode VT6, positive pole is connected with the negative pole of amplifier P2, the polar capacitor C7 that negative pole is then connected with the emitter of triode VT6, be serially connected in the resistance R15 between the negative pole of amplifier P2 and output stage, one end is connected with the emitter of triode VT7, the resistance R16 that the other end is connected with the negative pole of polar capacitor C7 forms, the collector of described triode VT6 is connected with the emitter of triode VT5, the positive pole of amplifier P2 is connected with the positive pole of polar capacitor C10, output stage is then connected with the base stage of triode VT7, and the collector of triode VT7 is connected with the negative pole of polar capacitor C11.
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