CN102198545A - Power supply device for short-arc cutting equipment - Google Patents

Abstract

The invention discloses a power supply device for short-arc cutting equipment, which comprises a main circuit, and a control circuit, a protection circuit, a time cumulating and timing circuit, a sensing circuit and a display circuit, which are connected with a power line of the main circuit in parallel. The power supply device for the short-arc cutting equipment disclosed by the invention has the advantages of precise control, high efficiency and wide continuous and adjustable working range of working voltage sections of the power supply device.

Description

A kind of short electric arc cutting apparatus supply unit

Technical field

The present invention relates to short electric arc cutting apparatus, particularly, relate to a kind of short electric arc cutting apparatus supply unit.

Background technology

Be called in name among " a kind of lack the power circuit that the electric arc cutting apparatus is used ", the application number position ZL02291891.4, lack holding circuit, time accumulative total and timing circuit, sensing circuit etc.; Especially lack holding circuit, in case overload has only by manually operated mode to solve, device security has deficiency during work, needs to improve; Simultaneously, existing supply unit is also on the basis that keeps original movable fixed pressure regulation, increase segmentation continuous voltage regulating and pulse width modulation control function, improved the machining accuracy of supply unit, strengthened supply unit labor aptitude and segmentation continuous operation number range.

Summary of the invention

The objective of the invention is to,, propose a kind of short electric arc cutting apparatus supply unit, to realize that control is accurate, efficient is high and the advantage of the continuous adjustable working range of increase supply unit operating voltage segmentation at the problems referred to above.

For achieving the above object; the technical solution used in the present invention is: a kind of short electric arc cutting apparatus supply unit; comprise main circuit, and the control circuit, holding circuit, time accumulative total and timing circuit, sensing circuit and the display circuit that are arranged in parallel with the power line of described main circuit.

Further, described main circuit comprises first to the three ac power line L1-L3 and center line N, described first to the three ac power line L1-L3 is connected with the ac power power supply with first link of center line N, and second link of first to the three ac power line L1-L3 is connected with first link of first to three branch among the air switch QF1 respectively; Second link of second link of respective branch and/or center line N in described air switch QF1, be parallel with successively: first group of current transformer 1TA unit, the second current transformer 2TA, 3TA and 4TA unit, control of the 3rd group pulse width and pressure regulation unit, the 4th group of air switch QF2 unit, the 5th group of air opened a QF3 unit, the 6th group of air switch QF4 unit, the 7th group of air switch QF5 unit, and the 8th group of Switching Power Supply FDPS-50BD unit.

Further, described first group of current transformer 1TA unit comprises: be connected on the current transformer 1TA on the second ac power line L2, the ammeter 1PA that connects with current transformer 1TA, the voltmeter 1PV in parallel with ammeter 1PA, the voltage change-over switch KK in parallel with voltmeter 1PV, first to the three fuse FU4-FU6 that connects with first to three branch among the voltage change-over switch KK respectively, first to the three fuse FU4-FU6 is connected with first to the three ac power line L1-L3 respectively away from the end of voltage change-over switch KK; Second group of current transformer 2TA, 3TA and 4TA unit comprise: be connected on current transformer 2TA, 3TA and 4TA on first to the three ac power line L1-L3 respectively, first end of current transformer 2TA, 3TA and 4TA overload protection current signal A1-A3, second end of output protection circuit respectively interconnects; Control of the 3rd group pulse width and pressure regulation unit comprise: first to the three twin crystal brake tube module MTC1-MTC3 that is connected with first to the three ac power line L1-L3 respectively, and be connected in parallel on transformer T and the voltage regulating module of first to the three twin crystal brake tube module MTC1-MTC3 respectively away from first to the three ac power line L1-L3, one end; The 4th group of air switch QF2 unit comprises: the air switch QF2 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and the controllable silicon controller CF6B-5A that is connected away from the end of first to the three ac power line L1-L3 with air switch QF2; The 5th group of air opened a QF3 unit and comprised: the air switch QF3 that first to three branch is connected with first to the three ac power line L1-L3 respectively, respectively with air switch QF3 in the contact 2KA that is connected away from the end of first to the three ac power line L1-L3 of first to three branch, and be connected in parallel on water pump M1 and the blower fan M3 of contact 2KA away from air switch QF3 one end; The 6th group of air switch QF4 unit comprises: the air switch QF4 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and air switch QF4 is connected with the lathe main power source away from an end of first to the three ac power line; The 7th group of air switch QF5 unit comprises: the air switch QF5 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and air switch QF5 is connected with the control power supply away from an end of first to the three ac power line; The 8th group of Switching Power Supply FDPS-50BD unit comprises: with the first ac power line L1 and center line N Switching Power Supply FDPS-50BD in parallel, Switching Power Supply FDPS-50BD is connected with power board away from the end of the first ac power line L1 and center line N.

Further, described control circuit comprises: respectively with the first ac power line L1 of main circuit and the control circuit L1 and the center line N of middle line parallel, on control circuit L1, be in series with fuse FU1, master key switch 1SA, short arc power switch 2SA, A.C. contactor normally-closed contact 13KA, total emergency stop switch 1SB, short arc power scram button 2SB, press button 3SB, A.C. contactor normally-closed contact 3KM, A.C. contactor normally-closed contact 2KM and ac contactor coil 1KM successively, and the indicator lamp 1HL in parallel with ac contactor coil 1KM.

Further, between described master key switch 1SA and short arc power key switch 2SA, draw a connecting line, at this connecting line and be connected between the fuse FU2 on the center line N and be parallel with first to seven branch road successively, wherein: first branch road comprises overcurrent protection relay normally open contact 1J and the overcurrent protection indicator lamp 7HL that series connection is provided with; Second branch road comprises overcurrent early warning protective relay normally opened contact 2J and the overcurrent early warning indicator lamp 8HL that series connection is provided with; The 3rd branch road comprises open-phase protection relay normally opened contact 3J and the open-phase protection indicator lamp 9HL that series connection is provided with; The 4th branch road comprises overvoltage protection relay normally open contact 4J and the overvoltage protection indicator lamp 10HL that series connection is provided with; The 5th branch road comprises owing hydraulic pressure protective relay normally opened contact 5J and owing hydraulic pressure protection indicator lamp 11HL of series connection setting; The 6th branch road comprises overheat protector relay normally open contact 6J and the overheat protector indicator lamp 12HL that series connection is provided with; The 7th branch road comprises buzzing early warning protective relay normally opened contact 7J and the buzzer 1FM that series connection is provided with.

Further, between described short arc power key switch 2SA and A.C. contactor normally-closed contact 13KA, draw a connecting line, at this connecting line and be connected between the fuse FU2 on the center line N and be parallel with first to fourth branch road successively, wherein: first branch road comprises timer 3KT normally-closed contact, integrated protection relay normally open contact 8J and the ac contactor coil 13KA that series connection is provided with; Second branch road comprises interchange contact-relay coil 2KA and the power supply indicator 5HL that is arranged in parallel; The 3rd branch road comprises for a long time device coil 2KT; The 4th branch road comprises timer coil 3KT.

Further, draw a connecting line between described short arc power scram button 2SB and normally opened contact 3SB, be parallel with first to five branch road successively, wherein second to five branch road is connected in parallel on this connecting line and is connected between the fuse FU2 on the center line N; Particularly: first branch road comprises short arc power roughing start button switch 4SB and the normally opened contact 1KM that is arranged in parallel with normally opened contact 3SB; Second branch road comprises short arc power semifinishing start button switch 5SB, A.C. contactor normally-closed contact 3KM, A.C. contactor normally-closed contact 1KM and the ac contactor coil 2KM that series connection is provided with, the short arc power semifinishing start button switch 6SB that is arranged in parallel with short arc power semifinishing start button switch 5SB and exchange contact-relay normally opened contact 2KM, and with the indicator lamp 2HL that exchanges contact-relay coil 2KM parallel connection; The 3rd branch road comprises short arc power fine finishining start button switch 7SB, A.C. contactor normally-closed contact 2KM, A.C. contactor normally-closed contact 1KM and the ac contactor coil 3KM that series connection is provided with, the short arc power fine finishining start button switch 8SB that is arranged in parallel with short arc power fine finishining start button switch 7SB and exchange contact-relay normally opened contact 4KM, and with the indicator lamp 3HL that exchanges contact-relay coil 3KM parallel connection; The 4th branch road comprises rotary switch 3SA, connects with auxiliary reclay coil 1KA when rotary switch 3SA pulls the direct election shelves, and auxiliary reclay coil 1KA is in parallel with indicator lamp 4HL, and rotary switch 3SA pulls and hangs sky in the time of can transferring the files; The auxiliary reclay normally opened contact 1KA that the 5th branch road comprises series connection with exchange contact-relay coil 4KM.

Further, described holding circuit comprises over-current protecting unit, secondary over-current protecting unit, an Overvoltage protecting unit, owes hydraulic pressure protected location, over-temperature protection unit and phase-lacking protective unit.

Further, described over-temperature protection unit comprises sensor.

Further, described display circuit comprises operating current display unit, operating voltage display unit and power supply temperature display unit.

The short electric arc cutting apparatus supply unit of various embodiments of the present invention is owing to comprise main circuit, and the control circuit, holding circuit and the display circuit that are arranged in parallel with the power line of main circuit, to realize that control precisely and the high advantage of efficient.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the operation principle schematic diagram that short electric arc cutting apparatus is used main circuit in the supply unit according to the present invention;

Fig. 2 is the operation principle schematic diagram of short electric arc cutting apparatus control circuit in the supply unit, time accumulative total and timing circuit according to the present invention;

Fig. 3 and Fig. 4 lack the operation principle schematic diagram of electric arc cutting apparatus with holding circuit in the supply unit and display circuit and TEMP holding circuit according to the present invention;

Fig. 5 is the making plate figure that short electric arc cutting apparatus is used power board in the supply unit according to the present invention.

The specific embodiment

Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.

According to the embodiment of the invention, provide a kind of short electric arc cutting apparatus supply unit.As Fig. 1-shown in Figure 4, present embodiment comprises main circuit, and the control circuit, holding circuit, time accumulative total and timing circuit, sensing circuit and the display circuit that are arranged in parallel with the power line of main circuit.

Here, main circuit has inlet wire ac current signal display circuit function, pressure-changing secondary rectification function of main transformer T, a twin crystal brake tube module pulse width modulation and a voltage-regulation secondary rectification function, contains monolithic processor controlled baffle DHC3040-KZB-001 Switching Power Supply FDPS-50BD functions of physical supply and overload signal protection and Presentation Function etc.

Further, in the above-described embodiments, above-mentioned main circuit comprises first to the three ac power line L1-L3 and center line N, first to the three ac power line L1-L3 is connected with the ac power power supply with first link of center line N, and second link of first to the three ac power line L1-L3 is connected with first link of first to three branch among the air switch QF1 respectively; Second link of second link of respective branch and/or center line N in air switch QF1, be parallel with successively: first group of current transformer 1TA unit, the second current transformer 2TA, 3TA and 4TA unit, the 3rd group of pulse width control and the pressure regulation unit of forming by KP1-KP6, the 4th group of air switch QF2 unit, the 5th group of air opened a QF3 unit, the 6th group of air switch QF4 unit, the 7th group of air switch QF5 unit, and the 8th group of Switching Power Supply FDPS-50BD unit.

Particularly, above-mentioned first group of current transformer 1TA unit comprises: be connected on the current transformer 1TA on the second ac power line L2, the ammeter 1PA that connects with current transformer 1TA, the voltmeter 1PV in parallel with ammeter 1PA, the voltage change-over switch KK in parallel with voltmeter 1PV, first to the three fuse FU4-FU6 that connects with first to three branch among the voltage change-over switch KK respectively, first to the three fuse FU4-FU6 is connected with first to the three ac power line L1-L3 respectively away from the end of voltage change-over switch KK.

Here, current transformer 1TA is used to detect the inlet wire alternating current, and for ammeter 1PA provides the instrument current signal, ammeter 1PA is used to show the inlet wire alternating current; 1, No. 3 binding post on the voltage change-over switch KK, 5, No. 7 binding posts, 9, No. 11 binding posts are connected with the end of fuse FU4, fuse FU5, fuse FU6 respectively, and the other end of fuse FU4, fuse FU5, fuse FU6 is connected with ac power line L1, L2, L3; Meet voltmeter 1PV with No. 12 terminals No. 2 of voltage change-over switch KK, and according to figure: 2,6, No. 10 terminals are connected, and 4,8, No. 12 terminal is connected; Voltmeter 1PV one termination N, another termination L, when rotating voltage change-over switch KK, turn to which ac power line of L1, L2, L3, what show is exactly the primary voltage numerical value of the ac power line among this L1, L2, the L3, voltmeter 1PV is used to detect the inlet wire alternating voltage, rotates voltage change-over switch KK and can detect inlet wire AC line L1, L2, L3 voltage value successively, checks whether balance of ac power line L1, L2, L3 three-phase.

Second group of current transformer 2TA, 3TA and 4TA unit comprise: be connected on current transformer 2TA, 3TA and 4TA on first to the three ac power line L1-L3 respectively, first end of current transformer 2TA, 3TA and 4TA overload protection current signal A1-A3, second end of output protection circuit respectively interconnects.

Here, current transformer 2TA, 3TA, 4TA are used to detect the inlet wire alternating current, and output A1, A2, A3 provide overload protection current signal on primary current main circuit ac power line L1, L2, the L3 for baffle DHC3040-KZB-001.

Control of the 3rd group pulse width and pressure regulation unit comprise: first to the three twin crystal brake tube module MTC1-MTC3 that is connected with first to the three ac power line L1-L3 respectively, and be connected in parallel on main transformer T and the voltage regulating module of first to the three twin crystal brake tube module MTC1-MTC3 respectively away from first to the three ac power line L1-L3, one end.

Here, twin crystal brake tube module MTC1, MTC2, MTC3 (claiming the inverse parallel control module again), the G1 on the twin crystal brake tube module MTC1 wherein, G4 respectively with CF6B-5A type controllable silicon controller on binding post 29, No. 28 terminal is connected, G3 on the twin crystal brake tube module MTC2, G6 respectively with CF6B-5A type controllable silicon controller on binding post 24, No. 26 terminal is connected, G2 on the twin crystal brake tube module MTC3, G5 respectively with CF6B-5A type controllable silicon controller on binding post 22, No. 20 terminal is connected, and is used for twin crystal brake tube module MTC1, MTC2, the triggering control of MTC3; It is in parallel with twin crystal brake tube module MTC1, MTC2, MTC3 respectively that capacitance-resistance absorbs module 1C, 2C, 3C, is used to protect twin crystal brake tube module MTC1, MTC2, MTC3; Three exchange that contact contact KM4 absorbs module 1C, 2C, 3C and twin crystal brake tube module MTC1 with capacitance-resistance respectively, MTC2, MTC3 are in parallel; Ac power line L1, L2, of control and the voltage-regulation control of L3 incoming power by form pulse width by twin crystal brake tube module MTC1, MTC2, MTC3, the link post of the output one termination main transformer T of twin crystal brake tube module MTC1, MTC2, MTC3, three link posts are connected with 1KM, 2KM, 3KM respectively, and the former limit of main transformer T adopts triangle to connect; Another termination air switch of output QF11 of twin crystal brake tube module MTC1, MTC2, MTC3; closure during air switch QF11 work; connect pressure-sensitive absorption plant 1MYN, 2MYN, 3MYN again; pressure-sensitive absorption plant 1MYN, 2MYN, 3MYN adopt the triangle connected mode; be used to protect the operate as normal of twin crystal brake tube module MTC1, MTC2, MTC3, absorb unusual crest voltage in the circuit.

Above-mentioned control circuit can be realized the working method of following two kinds of power supplys control:

First kind of mode: 3SA places the direct election state with power supply control mode switch, then power cabinet power supply direct election indicator lamp 4HL is bright, with main circuit ac power line L1, L2, three A.C. contactor 4KM coil electricities of L3 parallel connection, main contacts normally opened contact 4KM adhesive, short circuit is by twin crystal brake tube module MTC1, MTC2, pulse width control and regulating circuit that MTC3 forms, main circuit ac power line L1, L2, the 380V incoming power of L3 directly is added to the winding connection post IKM of main transformer T, 2KM, the fixedly end of incoming cables of 3KM, after the Secondary Winding transformation of main transformer T, be connected to commutation diode D1, D2, D3, D4, D5, D6, output services positive polarity after rectification, the other end of main transformer T Secondary Winding, meet paralleing reactor DK, hf arc starter YH, current divider FL output services voltage negative pole, on the current divider FL+A,-A connects secondary current protection input+A of monolithic processor controlled baffle DHC3040-KZB-001,-A, be connected to the operating current table simultaneously and show operating current, finish power supply direct election function; When power supply control mode switch 3SA places the direct election state simultaneously, auxiliary reclay 1KA coil electricity, its normally opened contact 1KA closure, the normally-closed contact 1KA of 1KA disconnects, and cuts off the phase shift controlling voltage on the controllable silicon controller CF6B-5A.

The second way: 3SA places adjustable state with power supply control mode switch, then do not keep normality because of there being electricity because of 1KA, 4KM coil, main circuit ac power line L1, L2, L3 pulse width control and regulating circuit by forming by twin crystal brake tube module MTC1, MTC2, MTC3, be added to the end of incoming cables of IKM, 2KM, 3KM, the output of power cabinet is controlled by pulse width control and regulating circuit that twin crystal brake tube module MTC1, MTC2, MTC3 form like this.

Main transformer T adopts dry-type transformer, dry type main transformer T once holds and adopts segmentation fixedly pressure regulation or segmentation continuous voltage regulating dual mode, secondary adopts the rectification of band hf arc starter YH and paralleing reactor DK, be provided with dynamic and static pressure regulation binding post respectively on three coils of the elementary winding of a pressure regulation end employing of main transformer T delta connection, one end of the lead that is in series with the normally opened contact of A.C. contactor KA on each primary winding coil is all fixedlyed connected with quiet pressure regulation binding post, and the other end contact of lead is dynamically connected with moving pressure regulation binding post respectively; Main transformer T secondary coil adopts the two anti-star connection of band hf arc starter YH and paralleing reactor DK, two points of the two anti-stars of main transformer T secondary windings coil connect the two ends of paralleing reactor DK respectively, the output of striking device YH and reactor DK is connected with cathode collector plate on being installed in the cathode assembly spindle drum that short electric arc cutting apparatus uses by cable, adopt the negative pole of six commutation diodes that two anti-star connections are connected together parallel with one another and be connected with the end of current divider FL with the secondary windings coil of main transformer T, the other end of current divider FL links to each other with workpiece to be machined by cable.

Be connected on the binding post of current divider FL-A+A,-A+A (referring to Fig. 2) connects two binding posts that operating current shows ammeter respectively, the binding post output of current divider FL (+A end of the same name)-V connects operating voltage and shows voltmeter, and output services electric current and operating voltage negative pole end; + V connects operating voltage and shows voltmeter end of the same name.

The 4th group of air switch QF2 unit comprises: the air switch QF2 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and the controllable silicon controller CF6B-5A that is connected away from the end of first to the three ac power line L1-L3 with air switch QF2.

Here, QF2 connects 1,2, No. 3 terminal on the CF6B-5A type controllable silicon controller; No. 12 terminals on the CF6B-5A type controllable silicon controller connect normally opened contact 13KA and normally-closed contact 1KA, connect voltage-regulation potentiometer W11 again, 12, No. 15 terminals on the CF6B-5A type controllable silicon controller connect end of slide wire and another stiff end of voltage-regulation potentiometer W11; 29,22,24,28,20, No. 26 terminals on the CF6B-5A type controllable silicon controller are connected with G1, G2, G3, G4, G5, G6 respectively.

The 5th group of air opened a QF3 unit and comprised: the air switch QF3 that first to three branch is connected with first to the three ac power line L1-L3 respectively, respectively with air switch QF3 in the contact 2KA that is connected away from the end of first to the three ac power line L1-L3 of first to three branch, and be connected in parallel on water pump M1 and the blower fan M3 of contact 2KA away from air switch QF3 one end.

Here, QF3 connects auxiliary reclay 2KA contact, power cabinet pump motor M12, cooling fan 2FD; Open key switch 1SA, 5HL is bright for the power cabinet power supply indicator, and cooling fan 2FD starts, auxiliary reclay 2KA coil electricity, and main contacts 2KA closure, power cabinet pump motor M1, cooling fan M2 begin rotation work.

The 6th group of air switch QF4 unit comprises: the air switch QF4 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and air switch QF4 is connected with the lathe main power source away from an end of first to the three ac power line; The 7th group of air switch QF5 unit comprises: the air switch QF5 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and air switch QF5 is connected with the control power supply away from an end of first to the three ac power line; The 8th group of Switching Power Supply FDPS-50BD unit comprises: with the first ac power line L1 and center line N Switching Power Supply FDPS-50BD in parallel, Switching Power Supply FDPS-50BD is connected with power board away from the end of the first ac power line L1 and center line N.

Here, main circuit ac power line L1, center line N one end are parallel with Switching Power Supply FDPS-50BD, 5V2, the SGND of other end joining power control panel input circuit ,+5V, GND ,+15V ,-the 15V end; Wherein+15V and-15V exports one the road to baffle by the rectifier and trigger plate, exports stable+5V power supply, for single chip part provides operating voltage.

FDPS-50DB is a Switching Power Supply, is used for the various working powers that the out-put supply control panel needs.From the stable+15V-15V of FDPS-50DB output ,+5V (altogether) and not voltage stabilizing+5V (not altogether) power supply supplies with the each several part operating voltage.Wherein+15V-15V ,+5V (altogether) gives the power supply of simulation part respectively, (not altogether)+the 5V power supply, for single chip part provides operating voltage.

Further, in the above-described embodiments, above-mentioned control circuit comprises: respectively with the first ac power line L1 of main circuit and the control circuit L1 and the center line N of middle line parallel, on control circuit L1, be in series with fuse FU1 successively, master key switch 1SA, short arc power switch 2SA, A.C. contactor normally-closed contact 13KA, total emergency stop switch 1SB, short arc power scram button 2SB, press button 3SB, A.C. contactor normally-closed contact 3KM, A.C. contactor normally-closed contact 2KM and ac contactor coil 1KM, and the indicator lamp 1HL in parallel with ac contactor coil 1KM.

Here, control circuit has thick rule standard, half smart rule standard, the accurate control function of essence rule, direct election and adjustable control function, protection presentation control function, timing and for a long time controls function and integrated protection control function.

Between above-mentioned master key switch 1SA and short arc power key switch 2SA, draw a connecting line, at this connecting line and be connected between the fuse FU2 on the center line N and be parallel with first to seven branch road successively, wherein: first branch road comprises overcurrent protection relay normally open contact 1J and the overcurrent protection indicator lamp 7HL that series connection is provided with; Second branch road comprises overcurrent early warning protective relay normally opened contact 2J and the overcurrent early warning indicator lamp 8HL that series connection is provided with; The 3rd branch road comprises open-phase protection relay normally opened contact 3J and the open-phase protection indicator lamp 9HL that series connection is provided with; The 4th branch road comprises overvoltage protection relay normally open contact 4J and the overvoltage protection indicator lamp 10HL that series connection is provided with; The 5th branch road comprises owing hydraulic pressure protective relay normally opened contact 5J and owing hydraulic pressure protection indicator lamp 11HL of series connection setting; The 6th branch road comprises overheat protector relay normally open contact 6J and the overheat protector indicator lamp 12HL that series connection is provided with; The 7th branch road comprises buzzing early warning protective relay normally opened contact 7J and the buzzer 1FM that series connection is provided with.

Between above-mentioned short arc power key switch 2SA and A.C. contactor normally-closed contact 13KA, draw a connecting line, at this connecting line and be connected between the fuse FU2 on the center line N and be parallel with first to fourth branch road successively, wherein: first branch road comprises timer 3KT normally-closed contact, integrated protection relay normally open contact 8J and the ac contactor coil 13KA that series connection is provided with; Second branch road comprises interchange contact-relay coil 2KA and the power supply indicator 5HL that is arranged in parallel; The 3rd branch road comprises for a long time device coil 2KT; The 4th branch road comprises timer coil 3KT.

Draw a connecting line between above-mentioned short arc power scram button 2SB and normally opened contact 3SB, be parallel with first to five branch road successively, wherein second to five branch road is connected in parallel on this connecting line and is connected between the fuse FU2 on the center line N; Particularly: first branch road comprises short arc power roughing start button switch 4SB and the normally opened contact 1KM that is arranged in parallel with normally opened contact 3SB; Second branch road comprises short arc power semifinishing start button switch 5SB, A.C. contactor normally-closed contact 3KM, A.C. contactor normally-closed contact 1KM and the ac contactor coil 2KM that series connection is provided with, the short arc power semifinishing start button switch 6SB that is arranged in parallel with short arc power semifinishing start button switch 5SB and exchange contact-relay normally opened contact 2KM, and with the indicator lamp 2HL that exchanges contact-relay coil 2KM parallel connection; The 3rd branch road comprises short arc power fine finishining start button switch 7SB, A.C. contactor normally-closed contact 2KM, A.C. contactor normally-closed contact 1KM and the ac contactor coil 3KM that series connection is provided with, the short arc power fine finishining start button switch 8SB that is arranged in parallel with short arc power fine finishining start button switch 7SB and exchange contact-relay normally opened contact 4KM, and with the indicator lamp 3HL that exchanges contact-relay coil 3KM parallel connection; The 4th branch road comprises rotary switch 3SA, connects with auxiliary reclay coil 1KA when rotary switch 3SA pulls the direct election shelves, and auxiliary reclay coil 1KA is in parallel with indicator lamp 4HL, and rotary switch 3SA pulls and hangs sky in the time of can transferring the files; The auxiliary reclay normally opened contact 1KA that the 5th branch road comprises series connection with exchange contact-relay coil 4KM.

Here, normally opened contact 6SB, the normally opened contact 2KM in parallel with normally opened contact 5SB, with normally-closed contact 3KM, the normally-closed contact 1KM of normally opened contact 5SB series connection, exchange contact-relay coil 2KM, with the indicator lamp 2HL that exchanges contact-relay coil 2KM parallel connection; Short arc power fine finishining start button switch 8SB, the normally opened contact 3KM in parallel with normally opened contact 7SB, with normally-closed contact 2KM, the normally-closed contact 1KM of normally opened contact 7SB series connection, exchange contact-relay coil 3KM, the signal lamp 3HL of indication is provided when being operated in fine finishining with the short arc power that exchanges contact-relay coil 3KM parallel connection; Rotary switch 3SA is short, and arc power is elected adjustable selection directly, control 4KM provided the power supply of main power source, cut-out commutating pulse transformer board when the short arc power of auxiliary reclay 1KA was operated in direct election, and the short arc power of signal lamp 4HL provides indication when being operated in direct election; 1KA, A.C. contactor 4KM provide main power source for 1KT when the short arc power of 4KM is operated in direct election; The normally opened contact 8J of the normally-closed contact of timer 3KT, integrated protection miniature relay J8; Press button 21SB protects reset (power cabinet); 1KA (87,89); 13KA (86,87); Starting button SB2 and A.C. contactor control coil KA, the normally opened contact of control coil KA and starting button SB2 are connected in parallel, open key switch 1SA, 5HL is bright for the power cabinet power supply indicator, cooling fan 2FD starts, auxiliary reclay 2KA coil electricity, main contacts 11KA closure, power cabinet pump motor M12 begins to rotate.

Select the power supply control mode, if power supply control mode switch 3SA places the direct election state, then power cabinet power supply direct election indicator lamp 4HL is bright, while auxiliary reclay 1KA coil electricity, its normally opened contact 1KA closure, A.C. contactor 4KM coil electricity, main contacts 4KM closure, short circuit makes the 380V incoming power directly be added to the end of incoming cables of IKM, 2KM, 3KM by the regulating circuit that KP1-KP6 forms, and finishes power supply direct election function.The normally-closed contact 1KA of 1KA disconnects simultaneously, cuts off the phase shift controlling voltage on the short arc power rectifier and trigger plate.If power supply control mode switch 3SA places adjustable state, then do not keep normality because of there being electricity because of 1KA, 4KM coil, the regulating circuit of 380V incoming power by being made up of KP1-KP6 is added to the end of incoming cables of IKM, 2KM, 3KM, and the output voltage of power cabinet is just controlled by voltage regulating line fully like this.

Preset maximum operating currenbt and operating voltage: regulate W10 and can preset maximum operating currenbt.Regulate W11 and can preset maximum working voltage.

Select power supply rule accurate, when selecting roughing rule to plant, press start button 3SB, A.C. contactor 1KM coil electricity, the closed self-locking of normally opened contact 1KM, main contacts 1KM closure, connect the accurate tap of thick rule of 1T, the accurate machining voltage of the thick rule of power cabinet output, kind of indication 1HL is bright for the rule of roughing simultaneously.If it is accurate or stop power supply changing power supply rule, press stop button 1SB, 1KM coil blackout then, main contacts disconnects, and disconnects the accurate tap of thick rule of main transformer T, and the rule of roughing simultaneously kind of an indication 1HL goes out.(semifinishing and fine finishining are the same with rough machined control principle, can with reference to roughing).The operation principle of relevant controllable silicon inverse parallel voltage regulating line is not described further at this, can be with reference to the products instruction of relevant books and three phase rectifier trigger board KCZ-6C manufacturer.

Timer 2 KT (TR641S) and device 3KT (BZ-142) circuit for a long time: for a long time the power supply of device 3KT is connected on the control power supply of power cabinet, as long as an opening power cabinet key switch 2SA, for a long time device 3KT (BZ-142) is the opening entry working time.The control of timer 2 KT (TR641S) is; its power supply directly is connected on the control power supply of power cabinet, and the normally opened contact series connection of its normally-closed contact 3KT and integrated protection relay 8J is under the normal condition; the 8J adhesive; the normally-closed contact of timer 2 KT keeps normality, arrived preset time after, the relay adhesive in the timer 2 KT; normally-closed contact 3KT disconnects; cut off the power path of 13KA, make the accurate control dump of selecting of power supply rule of power cabinet, can't work.The relay contact plug that draws outward is standby, after timer 2 KT started to control to the scheduled time, resumes work as need, can short circuit, can recover operate as normal.

Further, in the above-described embodiments, above-mentioned holding circuit comprises over-current protecting unit, secondary over-current protecting unit, an Overvoltage protecting unit, owes hydraulic pressure protected location, over-temperature protection unit and phase-lacking protective unit.Wherein, over-temperature protection unit comprises sensor.

Here, holding circuit has overcurrent, overvoltage, owes hydraulic pressure, excess temperature, phase shortage, overcurrent honey is reported to the police and the protection output function.Particularly, referring to Fig. 3 and Fig. 4:

Over-current protecting unit: from main circuit ac power line L1, L2, L3 comes, by being used to detect the current transformer 2TA of inlet wire alternating current, 3TA, the primary current overload protection current signal of 4TA is output as A1, A2, A3, wherein A1 connects the anode of an overcurrent protection current sampling commutation diode D1 and the negative electrode of an overcurrent protection current sampling commutation diode D4, A2 connects the anode of an overcurrent protection current sampling commutation diode D2 and the negative electrode of an overcurrent protection current sampling commutation diode D5, and A3 connects the anode of an overcurrent protection current sampling commutation diode D3 and the negative electrode of an overcurrent protection current sampling commutation diode D6; The end of incoming cables of the leading-out terminal of diode D1, diode D2, diode D3 and diode D4, diode D5, diode D6 be connected respectively I+ I-, be parallel with overcurrent protection filter capacitor C1 simultaneously one time, an overcurrent protection load resistance R9, the one action overcurrent is set the multi-turn precision potentiator W9 that regulates usefulness, exports the in-phase end (+) of IC2-d to from potentiometer W9; Diode D4, diode D5, diode D6, filter capacitor C1, resistance R 9, potentiometer W9 one end ground connection, the other end connects current-limiting resistance R11, current-limiting resistance R10, current-limiting resistance R10 one end connects Switching Power Supply+15V, the other end connects the inverting input (-) of IC2-d, connect current-limiting resistance R12, an overcurrent indication LED 4 from the IC2-d output, to anti-interference isolation photoelectrical coupler GO4 input, photoelectrical coupler GO4 input other end ground connection; Photoelectrical coupler GO4 exports a termination altogether, other end output connects the input P3.2 pin of IC4 (89C2051), when electric current reaches default definite value, current signal triggers electric current 120% or overcurrent 150% program of IC4 (89C2051) in the single-chip microcomputer, at the P1.7 that triggers single-chip microcomputer IC4 (89C2051), P1.6, P1.1 pin output low level, triode Q1, triode Q2, triode Q7 conducting, relay 1J, 2J, the 7J conducting, the normally opened contact 2J closure of relay 2J is connected the signal lamp 6HL that the short arc power cabinet of overcurrent 120% indicator lamp HL6 overcurrent is reported to the police, and sends electric current 120% indication; The normally opened contact 1J closure of relay 1J is connected the signal lamp 7HL that the short arc power cabinet of overcurrent indicator lamp HL7 overcurrent is reported to the police, and sends overcurrent 120% indication.The normally opened contact 7J closure of relay 7J is connected buzzing alarm relay coil, sends alarm signal.Simultaneously in P1.0 pin output low level; the Q8 conducting; relay 8J conducting; the normally opened contact closure of 8J; the auxiliary reclay 13KA coil that the power cabinet integrated protection is used gets electric adhesive; one group of normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects; cut off short arc power rule kind of the control power supply of selecting; another group normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects the phase shift controlling voltage that cuts off on the short arc power rectifier and trigger plate; and guarantee when overcurrent 120% occurring; lock operation control, the accident that prevents takes place.When electric current 120% occurring, send six seconds sound and light alarm signals, remind operating personnel to note.Whether current foldback circuit and secondary current foldback circuit occur once or the secondary overcurrent according to the touring detection of the program that prestores at single-chip microcomputer IC4 (89C2051), and which protection detects earlier, and which protection starts corresponding program at once, makes protection.Locking simultaneously is on-the-spot, sends alarm signal, reminds operating personnel to go to handle.

The secondary over-current protecting unit: the 75MV voltage signal-A from current divider 1FL is via (-) inverting input of biasing resistor R2 to IC1 (μ A741); feedback resistance R3 be amplified to about 0 to 10V with the operational amplifier that IC1 (μ A741) forms; 6 pin output from IC2 (LM324); be divided into four the tunnel; the first via is directly exported through resistance R 4, as the power supply input of current feedback.The second the tunnel delivers to work configuration switch 8SA through potentiometer W2 output shows as operating current, guarantee to show electric current simultaneously and to start to control electric current consistent, the 3rd, four the tunnel all is potentiometers that 6 pin of IC2 (LM324) connect over the ground, from potentiometer W3 the center head of W4 export IC3-1 to, the comparator circuit of the correspondence that IC3-2 forms, voltage as a comparison, the reference voltage that idiostatic device W5 sends here is made comparisons, when higher than reference voltage, in the corresponding output output low level of comparator, LED 11, LED 2 is luminous, while photoelectric coupling circuit GO1, GO2 conducting, its P3.4 pin conducting, trigger overcurrent 150% or overcurrent 120% program of IC4 (89C2051) in the single-chip microcomputer, at P1.7, P1.6, P1.1 pin output low level, Q1, Q2, Q7 conducting, relay 1J, 2J, the 7J conducting, the normally opened contact 1J closure of relay 1J is connected overcurrent indicator lamp HL7, send overcurrent 150% indication, the normally opened contact 2J closure of relay 2J is connected overcurrent 120% indicator lamp HL6, sends overcurrent 120% indication.The normally opened contact 7J closure of relay 7J is connected buzzing alarm relay coil, sends alarm signal.Simultaneously in P1.0 pin output low level; the Q8 conducting; relay 8J conducting; the normally opened contact closure of 8J; the auxiliary reclay 13KA coil that the power cabinet integrated protection is used gets electric adhesive; one group of normally-closed contact of 13KA disconnects; cut off short arc power rule kind of the control power supply of selecting; another group normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects; cut off the phase shift controlling voltage on the short arc power rectifier and trigger plate; and guarantee when overcurrent 150% occurring, lock operation control, the accident that prevents takes place.When overcurrent 120% occurring, send six seconds sound and light alarm signals, remind operating personnel to note.

75MV voltage signal+A from current divider 1FL is via biasing resistor R1 (+) in-phase input end to operational amplifier IC1 (μ A741); Output is respectively the first via to operating current filter capacitor C7, and ground connection; The second the road to feedback resistance R3; Third Road is to multi-turn precision potentiator W2, and operating current shows the multi-turn precision potentiator W3 that regulates and connect, and the early warning of operating current overcurrent is set and regulated; Multi-turn precision potentiator W4, operating current overcurrent set and regulate; To IC2 (LM324) multi-turn precision potentiator W0, debugging usefulness is regulated exportable 75mV voltage signal; Multi-turn precision potentiator W1, μ A741 transfers 0 usefulness; Multi-turn precision potentiator W5, operating current set and show adjusting.

+ 15V filter capacitor C5; + 15V filter capacitor C6; Divider resistance R01; Reset resistor R02; Operating voltage divider resistance R5; Current-limiting resistance R6; Current-limiting resistance R7; Photoelectrical coupler GO1, anti-interference isolation is used; Photoelectrical coupler GO2, anti-interference isolation is used; Overcurrent indication LED 1; Overcurrent early warning indication LED 2.

Overvoltage protecting unit: the operating voltage signal of sending here from anode divides three the tunnel after resistance R 5 step-downs; first via output is as the input of voltage feedback signal; the second the tunnel delivers to work configuration switch 9SA through potentiometer W7 output shows as operating voltage; Third Road is delivered to the comparator circuit of being made up of IC2-3 through potentiometer W8; voltage as a comparison; the reference voltage that idiostatic device W11 sends here is made comparisons; when higher than reference voltage; in the corresponding output output low level of comparator; LED 03 is luminous; photoelectric coupling circuit GO3 conducting simultaneously; its single-chip microcomputer IC4 (89C2051) 3.4 pin conductings; trigger the overvoltage protection program in the single-chip microcomputer IC4 (89C2051), at single-chip microcomputer IC4 (89C2051) P1.5; P1.1 pin output low level, Q4; the Q7 conducting; relay 4J; the 7J conducting; the normally opened contact closure of relay 4J is connected overvoltage indicator lamp HL10, sends the overvoltage indication.The normally opened contact 7J closure of relay 7J is connected buzzing alarm relay coil, sends alarm signal.Single-chip microcomputer IC4 (89C2051) is in P1.0 pin output low level simultaneously; the Q8 conducting; relay 8J conducting; the normally opened contact closure of 8J; the auxiliary reclay 13KA coil that the power cabinet integrated protection is used gets electric adhesive; one group of normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects; cut off short arc power rule kind of the control power supply of selecting; another group normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects; cut off the phase shift controlling voltage on the short arc power rectifier and trigger plate; thereby guarantee when overvoltage occurring, lock operation control, the accident that prevents takes place.

Owe the hydraulic pressure protected location: by the next signal of telecommunication of hydraulic controller, through owing hydraulic pressure filter capacitor C9 filtering, indicate with LED 6 to owing hydraulic pressure through current-limiting resistance R17 again, to the photoelectrical coupler GO6 of anti-interference isolation usefulness, another input end grounding of photoelectrical coupler GO6; Photoelectrical coupler GO6 output one end ground connection, the P3.4 pin input end of another termination of output IC4 (89C2051), when occurring owing hydraulic pressure, closure when the normally-closed contact of hydraulic controller hangs down meeting from normal hydraulic pressure because of hydraulic pressure becomes disconnection, LED 5 is luminous, photoelectric coupling circuit GO6 conducting simultaneously, its P3.4 pin conducting, trigger in the single-chip microcomputer IC4 (89C2051) owe hydraulic pressure defence program P1.3 pin (output low level) through No. 15 lines to current-limiting resistance 1R9, again to triode Q5 base stage, the grounded collector of triode Q5, emitter stage connects three-circuit in parallel: connect with current-limiting resistance 1R10 for owing hydraulic pressure indication usefulness light emitting diode 1LED5 for first group, second group is relay 5J coil, and the 3rd group is relay protection diode 1D6, three groups of outputs in parallel; 1P1.0 pin output low level, triode Q5, triode Q7 conducting, (triode Q5 is used to drive relay 5J, triode Q7 is used to drive relay 7J), relay 5J, the 7J conducting, the normally opened contact 5J closure of relay 5J is connected and is owed hydraulic pressure indicator lamp HL11 (short arc power cabinet is owed the signal lamp HL11 of hydraulic pressure warning usefulness), short arc power cabinet is owed hydraulic pressure and is reported to the police, and sends and owes the hydraulic pressure indication.The normally opened contact 7J closure of relay 7J is connected buzzing alarm relay coil, sends alarm signal.Simultaneously in P1.0 pin output low level; triode Q8 conducting; relay 8J conducting; the normally opened contact closure of 8J; the auxiliary reclay 13KA coil that the power cabinet integrated protection is used gets electric adhesive; one group of normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects; cut off the accurate control power supply of selecting of short arc power rule; another group normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects the phase shift controlling voltage that cuts off on the short arc power rectifier and trigger plate; thereby guarantee when occurring owing hydraulic pressure; lock operation control, the accident that prevents takes place.

Over-temperature protection unit: the sensor probe of temperature sensor PT100 is inserted the temperature detecting point of main transformer T and fixing, sensor probe surface isolates with insulating paper and transformer T, two electrical signal lines of sensor PT100 are connected with 15,16 binding posts of temperature controller TE7-RB10 respectively, adopt the output of relay normally open contact switch, from the signal of telecommunication that temperature sensor BT100 comes, the winding temperature of main transformer T is monitored through temperature controller TE7-RB10; When excess temperature occurring, temperature controller TE7-RB10 normally opened contact can become closure, corresponding LED 14, photoelectric coupling circuit GO5 conducting simultaneously, the P3.4 pin conducting of its IC4 (89C2051) triggers the excess temperature in the single-chip microcomputer IC4 (89C2051), at IC4 (89C2051) P1.3, P1.0 pin output low level, Q4, the Q7 conducting, relay 4J, 7J conducting, the normally opened contact 4J closure of relay J 4, connect excess temperature indicator lamp HD10, send the excess temperature indication.The normally opened contact 7J closure of relay 7J is connected buzzing alarm relay coil, sends alarm signal.Simultaneously in IC4 (89C2051) P1.0 pin output low level; the Q8 conducting; relay 8J conducting; the normally opened contact closure of 8J; the auxiliary reclay 13KA coil that the power cabinet integrated protection is used gets electric adhesive; one group of normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects; cut off the accurate control power supply of selecting of short arc power rule; another group normally-closed contact of the auxiliary reclay 13KA that the power cabinet integrated protection is used disconnects the phase shift controlling voltage that cuts off on the short arc power rectifier and trigger plate; thereby guarantee when excess temperature occurring; lock operation control, the accident that prevents takes place.

Phase-lacking protective unit: open-phase protection circuit is its non-vanishing design of asterism centering voltage that is linked to be star-like circuit when utilizing three phase mains phase shortage or Voltage unbalance.Promptly the 4th group of phase line L1, phase line L2, phase line L3, center line N one end are parallel with QF2, and the QF2 other end connects the CF6B-5A controllable silicon controller; Connect the A that comes from the QF2 other end; B; C; N connects current-limiting resistance R13 respectively; current-limiting resistance R14; current-limiting resistance R15; an end that exports open-phase protection commutation diode D8 and open-phase protection commutation diode D7 in parallel again; diode D8 other end series limiting resistor R16 and open-phase protection indication LED 5; LED 5 other ends connect anti-interference isolation photoelectrical coupler GO5 input; the P3.7 pin input end of another termination of output IC4 (89C2051); LED 5 is luminous when the phase failure occurring; photoelectric coupling circuit GO5 conducting simultaneously; the 3.7 pin conductings of its IC4 (89C2051); trigger the open-phase protection program in the single-chip microcomputer IC4 (89C2051); at P1.5; P1.1 pin output low level; triode Q3; (triode Q3 is used to drive relay in triode Q7 conducting; triode Q7 is used to drive relay 7J); the relay 3J that is attached thereto; the 7J conducting; the normally opened contact 3J closure of relay J 3; connect phase shortage indicator lamp 9HD; send the phase shortage indication; the normally opened contact J10 closure of relay 7J; connect buzzing alarm relay coil, send alarm signal.Simultaneously in P1.0 pin output low level; the Q8 conducting; relay 8J conducting, the normally opened contact closure of 8J, the auxiliary reclay 13KA coil that the power cabinet integrated protection is used gets electric adhesive; one group of normally-closed contact of 13KA disconnects; cut off short arc power rule kind of the control power supply of selecting, another group normally-closed contact of 13KA disconnects the phase shift controlling voltage that cuts off on the short arc power rectifier and trigger plate, thereby guarantees when phase shortage occurring; lock operation control, the accident that prevents takes place.

Center line N connects the end of open-phase protection commutation diode D7 and another input of photoelectrical coupler GO6 respectively, is parallel with open-phase protection filter capacitor C2 between open-phase protection commutation diode D7 and photoelectrical coupler GO6; Another output of photoelectrical coupler GO6 connects altogether.

Further, in the above-described embodiments, display circuit comprises operating current display unit, operating voltage display unit and power supply temperature display unit.Particularly, can be referring to Fig. 3 and Fig. 4 (Fig. 4 be the physical circuit principle schematic of power board part among Fig. 3):

Operating current shows: I worker shows operating current and shows the multi-turn precision potentiator W2 that shows adjusting usefulness by operating current, guarantee that the operating current that shows shows consistent with the overcurrent that starts to control, I establishes apparent overcurrent demonstration adjusting usefulness is set in the electric current demonstration by operating current multi-turn precision potentiator W5 is set, regulate overcurrent current value is set, and in upward demonstration of operating current table (3PA), operating current shows with the real work electric current synchronous.

Operating voltage shows: V worker shows operating voltage and shows adjusting multi-turn precision potentiator W6, operating voltage shows with real work voltage synchronous, V establishes and shows operating voltage setting demonstration adjusting multi-turn precision potentiator W8, operating voltage shows with real work voltage synchronous, can be directly during adjusting directly reads from showing.

Main circuit ac power line L2 goes up string current transformer 1TA: current transformer 1TA is used to detect the inlet wire alternating current, and for the 1PA ammeter provides the instrument current signal, the 1PA ammeter is used to show the inlet wire alternating current; 1, No. 3 binding post on the three-phase voltage change-over switch KK, 5, No. 7 binding posts, 9, No. 11 binding posts are connected with the end of fuse FU4, fuse FU5, fuse FU6 respectively, and the other end of fuse FU4, fuse FU5, fuse FU6 is connected with ac power line L1, L2, L3; Connect the 1PV voltmeter with No. 12 terminals No. 2 of voltage change-over switch KK, and be connected according to Fig. 2,6, No. 10 terminals, 4,8, No. 12 terminal is connected; 1PV voltmeter one termination N, another termination L, when rotating voltage change-over switch KK, turn to which ac power line of L1, L2, L3, what show is exactly the primary voltage numerical value of the ac power line among this L1, L2, the L3, the 1PV voltmeter is used to detect the inlet wire alternating voltage, rotates voltage change-over switch KK and can detect and show inlet wire AC line L1, L2, L3 voltage value successively, checks whether balance of ac power line L1, L2, L3 three-phase;

The input current table shows: No. 3 lines of two terminals, N line that the input current table shows are connected with the N line with No. 3 lines of control circuit respectively, and input voltage is 220; The input voltage table shows: No. 3 lines of two terminals, N line that the input voltage display list shows are connected with the N line with No. 3 lines of control circuit respectively, and input voltage is 220; Operating current is set and is shown the multi-turn precision potentiator W5 that regulates usefulness, the operating current overcurrent is set the multi-turn precision potentiator W4 that regulates usefulness, and the multi-turn precision potentiator W3 that regulates usefulness, multi-turn precision potentiator W0 are set in the early warning of operating current overcurrent, debugging usefulness is regulated exportable 75MV voltage signal; Multi-turn precision potentiator W1, μ A741 transfers 0 usefulness; Multi-turn precision potentiator W9, the one action overcurrent is set and is regulated; Sound and light alarm output indication light emitting diode 1LED7; Power supply operate as normal indication light emitting diode 1LED8.

V worker is apparent to pass through, multi-turn precision potentiator W6, and operating voltage shows regulates; Multi-turn precision potentiator W7, operating voltage is set and is regulated; Preset maximum operating currenbt and operating voltage, regulate W10 and can preset maximum operating currenbt.Regulate W11 and can preset maximum working voltage.

Select power supply rule accurate: when selecting roughing rule to plant, to press start button 3SB, A.C. contactor 1KM coil electricity, the closed self-locking of normally opened contact 1KM, main contacts 1KM closure, the accurate tap of thick rule of connecting 1T, the accurate machining voltage of the thick rule of power cabinet output, kind of indication 1HL is bright for the rule of roughing simultaneously.If it is accurate or stop power supply changing power supply rule, press stop button 1SB, 1KM coil blackout then, main contacts disconnects, and disconnects the accurate tap of thick rule of main transformer T, and the rule of roughing simultaneously kind of an indication 1HL goes out.(semifinishing and fine finishining are the same with rough machined control principle, can with reference to roughing).

The operation principle of relevant controllable silicon inverse parallel voltage regulating line, and the use of controllable silicon controller CF6B-5A are not described further at this, can be with reference to the technical specification of relevant books and controllable silicon controller CF6B-5A.

The baffle debugging step: on the short-circuit plate "+A ,-A " end, regulate W1 then, making 2PA, 3PA show value is 0.Electric current initialize switch 8SA is put " presetting " side, clockwise maximum operating currenbt presetting potential device W10 is screwed into head, regulate W5 then and make 2PA, 3PA display power supply cabinet maximum output current value.From the 75MV voltage signal of "+A ,-A " end input standard of circuit board, regulate W2 then and make 2PA, 3PA show the load current value of adapted current divider.

Overcurrent 150% is adjusted; earlier electric current initialize switch 8SA is put " presetting " side; regulate maximum operating currenbt presetting potential device W10; make 2PA, 3PA display power supply cabinet output-current rating value; again electric current initialize switch 8SA is put " work " side, from the adjustable 0-75MV voltage signal of "+A ,-A " end input of circuit board, when 2PA, 3PA show value be preset value 150% the time; regulate W4 and make LED1 bright, the current foldback circuit action.

Overcurrent 120% is adjusted; earlier electric current initialize switch 8SA is put " presetting " side; regulate operating current presetting potential device W10; make 2PA, 3PA display power supply cabinet output-current rating value; again electric current initialize switch 8SA is put " work " side, from the adjustable 0-75MV voltage signal of "+A ,-A " end input of circuit board, when 2PA, 3PA show value be preset value 120% the time; regulate W4 and make LED1 bright, the action of overcurrent early warning 120% holding circuit.

Overvoltage is adjusted; earlier voltage initialize switch 9SA is put " presetting " side; clockwise voltage presetting potential device W11 is screwed into head; regulating W8 then makes 2PV, 3PV show power cabinet maximum output voltage value; again voltage initialize switch 9SA is put " work " side,, regulate W6 then and make 2PV, 3PV demonstration+48V magnitude of voltage as 2PV, when the 3PV show value is the same with preset value from " V worker advances " end input 48V voltage signal of circuit board; regulate W7 and make LED3 bright, the overvoltage crowbar action.

Main transformer T primary side over-current adjusting; when short arc power is operated in thick rule kind; the artificial length feed amount that strengthens; make short arc power overload operation in short-term; LED1 was bright when adjusting W4 made main transformer T primary side current reach rated value 110%, the action of main transformer T primary side current foldback circuit.Main transformer T primary side excess temperature is adjusted, and regulates XMT, makes temp controlled meter output alarm signal when design temperature is the transformer maximum operation temperature, the action of main transformer T primary side thermal-shutdown circuit.Owe hydraulic pressure and adjust, regulate YWK, make water pressure gauge output alarm signal when being lower than setting hydraulic pressure, owe the action of hydraulic pressure holding circuit.

Protection output circuit: the circuit of this part mainly is made up of single-chip microcomputer (89C2051); behind the electrification reset; according to the program that prestores; single-chip microcomputer 89C2051 begins touring detection and overcurrent, overvoltage, excess temperature, phase shortage whether occur, owe hydraulic pressure, reaches short-time overload (being overcurrent 120%); in case occur unusual; start corresponding program at once, make protection.Locking simultaneously is on-the-spot, sends alarm signal, reminds operating personnel to go to handle.

Rectifier and trigger plate phase-shifting voltages output circuit: the proportional amplifier major function of being made up of IC1 (μ A741) is to provide phase-shifting voltages for the rectifier and trigger plate, when operate as normal by Power Regulation potentiometer W11, voltage feedback potentiometer W12, current feedback potentiometer W13 three road voltage signals are done the 6 pins output that computing composite signal IC1 (μ A741) ratio is amplified back IC1 (μ A741), and output is as the phase-shifting voltages of rectifier and trigger plate after resistance R 23 current limlitings.

The control panel circuit: the The whole control circuit is made a printed circuit board structure and is divided into power unit, protection part, rectifier and trigger plate phase-shifting voltages output from function except that the rectifier and trigger plate.

The power unit operating circuit: main circuit ac power line L1, center line N one end are parallel with Switching Power Supply FDPS-50BD, 5V2, the SGND of other end joining power control panel input circuit ,+5V, GND ,+15V ,-the 15V end; Wherein+15V and-15V exports one the road to baffle by the rectifier and trigger plate, exports stable+5V power supply, for single chip part provides operating voltage.

In addition, need to prove control panel part in the upper right corner among Fig. 4, is a kind of mode of Fig. 3 control panel circuit, is not that unique wiring is made, and this wiring board (Fig. 5) also can adopt the different wiring modes of connection.

In sum, the short electric arc cutting apparatus supply unit of various embodiments of the present invention is owing to comprise main circuit, and the control circuit, holding circuit and the display circuit that are arranged in parallel with the power line of main circuit, to realize that control precisely and the high advantage of efficient.

It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. one kind short electric arc cutting apparatus supply unit is characterized in that, comprises main circuit, and the control circuit, holding circuit, time accumulative total and timing circuit, sensing circuit and the display circuit that are arranged in parallel with the power line of described main circuit.

2. short electric arc cutting apparatus supply unit according to claim 1, it is characterized in that, described main circuit comprises first to the three ac power line L1-L3 and center line N, described first to the three ac power line L1-L3 is connected with the ac power power supply with first link of center line N, and second link of first to the three ac power line L1-L3 is connected with first link of first to three branch among the air switch QF1 respectively;

Second link of second link of respective branch and/or center line N in described air switch QF1, be parallel with successively: first group of current transformer 1TA unit, the second current transformer 2TA, 3TA and 4TA unit, control of the 3rd group pulse width and pressure regulation unit, the 4th group of air switch QF2 unit, the 5th group of air opened a QF3 unit, the 6th group of air switch QF4 unit, the 7th group of air switch QF5 unit, and the 8th group of Switching Power Supply FDPS-50BD unit.

3. short electric arc cutting apparatus supply unit according to claim 2, it is characterized in that, described first group of current transformer 1TA unit comprises: be connected on the current transformer 1TA on the second ac power line L2, the ammeter 1PA that connects with current transformer 1TA, the voltmeter 1PV in parallel with ammeter 1PA, the voltage change-over switch KK in parallel with voltmeter 1PV, first to the three fuse FU4-FU6 that connects with first to three branch among the voltage change-over switch KK respectively, first to the three fuse FU4-FU6 is connected with first to the three ac power line L1-L3 respectively away from the end of voltage change-over switch KK;

Second group of current transformer 2TA, 3TA and 4TA unit comprise: be connected on current transformer 2TA, 3TA and 4TA on first to the three ac power line L1-L3 respectively, first end of current transformer 2TA, 3TA and 4TA overload protection current signal A1-A3, second end of output protection circuit respectively interconnects;

Control of the 3rd group pulse width and pressure regulation unit comprise: first to the three twin crystal brake tube module MTC1-MTC3 that is connected with first to the three ac power line L1-L3 respectively, and be connected in parallel on main transformer T and the voltage regulating module of first to the three twin crystal brake tube module MTC1-MTC3 respectively away from first to the three ac power line L1-L3, one end;

The 4th group of air switch QF2 unit comprises: the air switch QF2 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and the controllable silicon controller CF6B-5A that is connected away from the end of first to the three ac power line L1-L3 with air switch QF2;

The 5th group of air opened a QF3 unit and comprised: the air switch QF3 that first to three branch is connected with first to the three ac power line L1-L3 respectively, respectively with air switch QF3 in the contact 2KA that is connected away from the end of first to the three ac power line L1-L3 of first to three branch, and be connected in parallel on water pump M1 and the blower fan M3 of contact 2KA away from air switch QF3 one end;

The 6th group of air switch QF4 unit comprises: the air switch QF4 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and air switch QF4 is connected with the lathe main power source away from an end of first to the three ac power line;

The 7th group of air switch QF5 unit comprises: the air switch QF5 that first to three branch is connected with first to the three ac power line L1-L3 respectively, and air switch QF5 is connected with the control power supply away from an end of first to the three ac power line;

The 8th group of Switching Power Supply FDPS-50BD unit comprises: with the first ac power line L1 and center line N Switching Power Supply FDPS-50BD in parallel, Switching Power Supply FDPS-50BD is connected with power board away from the end of the first ac power line L1 and center line N.

4. short electric arc cutting apparatus supply unit according to claim 2, it is characterized in that, described control circuit comprises: respectively with the first ac power line L1 of main circuit and the control circuit L1 and the center line N of middle line parallel, on control circuit L1, be in series with fuse FU1 successively, master key switch 1SA, short arc power switch 2SA, A.C. contactor normally-closed contact 13KA, total emergency stop switch 1SB, short arc power scram button 2SB, press button 3SB, A.C. contactor normally-closed contact 3KM, A.C. contactor normally-closed contact 2KM and ac contactor coil 1KM, and the indicator lamp 1HL in parallel with ac contactor coil 1KM.

5. short electric arc cutting apparatus supply unit according to claim 4, it is characterized in that, between described master key switch 1SA and short arc power key switch 2SA, draw a connecting line, at this connecting line and be connected between the fuse FU2 on the center line N and be parallel with first to seven branch road successively, wherein: first branch road comprises overcurrent protection relay normally open contact 1J and the overcurrent protection indicator lamp 7HL that series connection is provided with; Second branch road comprises overcurrent early warning protective relay normally opened contact 2J and the overcurrent early warning indicator lamp 8HL that series connection is provided with; The 3rd branch road comprises open-phase protection relay normally opened contact 3J and the open-phase protection indicator lamp 9HL that series connection is provided with; The 4th branch road comprises overvoltage protection relay normally open contact 4J and the overvoltage protection indicator lamp 10HL that series connection is provided with; The 5th branch road comprises owing hydraulic pressure protective relay normally opened contact 5J and owing hydraulic pressure protection indicator lamp 11HL of series connection setting; The 6th branch road comprises overheat protector relay normally open contact 6J and the overheat protector indicator lamp 12HL that series connection is provided with; The 7th branch road comprises buzzing early warning protective relay normally opened contact 7J and the buzzer 1FM that series connection is provided with.

6. short electric arc cutting apparatus supply unit according to claim 4, it is characterized in that, between described short arc power key switch 2SA and A.C. contactor normally-closed contact 13KA, draw a connecting line, at this connecting line and be connected between the fuse FU2 on the center line N and be parallel with first to fourth branch road successively, wherein: first branch road comprises timer 3KT normally-closed contact, integrated protection relay normally open contact 8J and the ac contactor coil 13KA that series connection is provided with; Second branch road comprises interchange contact-relay coil 2KA and the power supply indicator 5HL that is arranged in parallel; The 3rd branch road comprises for a long time device coil 2KT; The 4th branch road comprises timer coil 3KT.

7. short electric arc cutting apparatus supply unit according to claim 4, it is characterized in that, between described short arc power scram button 2SB and normally opened contact 3SB, draw a connecting line, be parallel with first to five branch road successively, wherein second to five branch road is connected in parallel on this connecting line and is connected between the fuse FU2 on the center line N; Particularly: first branch road comprises short arc power roughing start button switch 4SB and the normally opened contact 1KM that is arranged in parallel with normally opened contact 3SB; Second branch road comprises short arc power semifinishing start button switch 5SB, A.C. contactor normally-closed contact 3KM, A.C. contactor normally-closed contact 1KM and the ac contactor coil 2KM that series connection is provided with, the short arc power semifinishing start button switch 6SB that is arranged in parallel with short arc power semifinishing start button switch 5SB and exchange contact-relay normally opened contact 2KM, and with the indicator lamp 2HL that exchanges contact-relay coil 2KM parallel connection; The 3rd branch road comprises short arc power fine finishining start button switch 7SB, A.C. contactor normally-closed contact 2KM, A.C. contactor normally-closed contact 1KM and the ac contactor coil 3KM that series connection is provided with, the short arc power fine finishining start button switch 8SB that is arranged in parallel with short arc power fine finishining start button switch 7SB and exchange contact-relay normally opened contact 4KM, and with the indicator lamp 3HL that exchanges contact-relay coil 3KM parallel connection; The 4th branch road comprises rotary switch 3SA, connects with auxiliary reclay coil 1KA when rotary switch 3SA pulls the direct election shelves, and auxiliary reclay coil 1KA is in parallel with indicator lamp 4HL, and rotary switch 3SA pulls and hangs sky in the time of can transferring the files; The auxiliary reclay normally opened contact 1KA that the 5th branch road comprises series connection with exchange contact-relay coil 4KM.

8. according to claim 2 or 3 described short electric arc cutting apparatus supply units; it is characterized in that described holding circuit comprises over-current protecting unit, secondary over-current protecting unit, an Overvoltage protecting unit, owes hydraulic pressure protected location, over-temperature protection unit and phase-lacking protective unit.

9. short electric arc cutting apparatus supply unit according to claim 8 is characterized in that described over-temperature protection unit comprises sensor.

10. short electric arc cutting apparatus supply unit according to claim 1 is characterized in that described display circuit comprises operating current display unit, operating voltage display unit and power supply temperature display unit.

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