CN104555764A - Rotary braking system and tower crane control system - Google Patents
Rotary braking system and tower crane control system Download PDFInfo
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- CN104555764A CN104555764A CN201510004635.3A CN201510004635A CN104555764A CN 104555764 A CN104555764 A CN 104555764A CN 201510004635 A CN201510004635 A CN 201510004635A CN 104555764 A CN104555764 A CN 104555764A
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- eddy current
- circuit
- relay
- storage battery
- brake
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The invention discloses a rotary braking system and a tower crane control system. The rotary braking system comprises a rotary braking circuit and a rotary eddy current braking circuit, wherein the rotary braking circuit comprises a switch, a first transformer, a rectifying circuit, a brake switch and a first storage battery; the switch is automatically switched on when sudden power failure of the power grid is caused or when the power grid fails; the first transformer is connected in series between the power grid and a rotary braking power supply of the tower crane; the first storage battery is connected to the rotary braking power supply by virtue of the switch and the brake switch; the rotary eddy current braking circuit comprises a power grid power supply circuit and a storage battery power supply circuit; and the storage battery power supply circuit comprises a second transformer connected in series between the power grid and an eddy current coil of the eddy current motor, a rectification filter circuit, a charging circuit, a second storage battery, an internal control relay, and a relay control circuit connected with the internal control relay. According to the systems disclosed by the invention, the eddy current braking failure and out-of-control risk caused by the power failure or fault of the power grid can be effectively avoided.
Description
Technical field
The present invention relates to frequency conversion control technique field, more particularly, relate to rotary braking system and tower crane control system.
Background technology
Tower crane is weight-lifting equipment conventional on building ground, and the crane arm of tower crane is a kind of common swing type mechanism, and its feature has larger seismic inertia, start too fast impact large, stopping and beating to reverse does not allow too fast too urgent, otherwise not only galloping, also can damage mechanism.
Existing rotary braking system is by the revolution action carrying out frequency conversion drive to eddy current motor (what adopt at present is be with the wire-wound asynchronous motor of eddy current coil), eddy current brake realizes crane arm, but, when the unexpected power-off of electrical network or et out of order (as failure conditions such as electrical network phase shortage or instant power-downs), eddy current coil power-off failure, cannot eddy current brake be carried out, can make that swing type mechanism is out of control causes accident.
Summary of the invention
In view of this, the invention provides rotary braking system and tower crane control system, the eddy current brake inefficacy brought to prevent grid cut-off or et out of order, risk out of control.
A kind of rotary braking system, comprises revolution drag circuit and revolution eddy current brake circuit;
Described revolution drag circuit comprises: the switch automatically closed when the unexpected power-off of electrical network or et out of order, the first voltage transformer, rectifying circuit and BK Brake Switch between the revolution power brake source being serially connected in electrical network and tower crane, and the first storage battery of described revolution power brake source is connected to through described switch and described BK Brake Switch;
Described revolution eddy current brake circuit comprises mains supply loop and storage battery power supply loop, wherein said storage battery power supply loop comprises: be serially connected in the second voltage transformer between electrical network and the eddy current coil of eddy current motor, current rectifying and wave filtering circuit, charge circuit, the second storage battery and internal piloting relay, and is connected with described internal piloting relay, for controlling the control relay circuit of the open contact adhesive of described internal piloting relay when the unexpected power-off of electrical network or et out of order.
Wherein, described mains supply loop comprises and is serially connected in controlled rectification circuit between electrical network and described eddy current coil and external control relay.
Wherein, described controlled rectification circuit is half-wave controlled rectification circuit.
A kind of rotary braking system, comprises revolution drag circuit and revolution eddy current brake circuit;
Described revolution drag circuit comprises: the first controlled rectification circuit between the revolution power brake source being serially connected in electrical network and tower crane and BK Brake Switch;
Described revolution eddy current brake circuit comprises mains supply loop and storage battery power supply loop, wherein said storage battery power supply loop comprises: be serially connected in the voltage transformer between electrical network and the eddy current coil of eddy current motor, current rectifying and wave filtering circuit, charge circuit, storage battery and internal piloting relay, and is connected with described internal piloting relay, for controlling the control relay circuit of the open contact adhesive of described internal piloting relay when the unexpected power-off of electrical network or et out of order; Described storage battery also connects described revolution power brake source through described internal piloting relay.
Wherein, described mains supply loop comprises and is serially connected in the second controlled rectification circuit between electrical network and described eddy current coil and external control relay.
Wherein, described first controlled rectification circuit and/or described second controlled rectification circuit are half-wave controlled rectification circuit.
A kind of tower crane control system, comprises eddy current motor, for driving the frequency converter of described eddy current motor, and for braking the rotary braking system of described eddy current motor, wherein: described rotary braking system is the first rotary braking system above-mentioned.
Wherein, described eddy current motor is the squirrel cage asynchronous motor of band eddy current coil.
Alternatively, the luffing power brake source of the outgoing side access tower crane of the rectifying circuit in described rotary braking system; The first storage battery in described rotary braking system accesses described luffing power brake source through described switch.
A kind of tower crane control system, comprises eddy current motor, for driving the frequency converter of described eddy current motor, and for braking the rotary braking system of described eddy current motor, wherein: described rotary braking system is above-mentioned the second rotary braking system.
Wherein, described eddy current motor is the squirrel cage asynchronous motor of band eddy current coil.
Alternatively, the mouth of the first controlled rectification circuit in described rotary braking system also connects the luffing power brake source of tower crane, and the storage battery in described rotary braking system also connects described luffing power brake source through internal piloting relay.
Alternatively, described tower crane control system also comprises: the first diode that anode connects described first controlled rectification circuit, negative electrode connects described luffing power brake source; The second diode that anode connects described first controlled rectification circuit, negative electrode connects described revolution power brake source; The 3rd diode that anode connects described internal piloting relay, negative electrode connects described revolution power brake source; The 4th diode that anode connects described internal piloting relay, negative electrode connects described luffing power brake source; And the 5th diode that anode connects described internal piloting relay, negative electrode connects described eddy current coil.
As can be seen from above-mentioned technical scheme, the present invention is cut-in relay and control relay circuit on the storage battery power supply loop of eddy current coil, and the open contact adhesive of described relay is controlled when the unexpected power-off of electrical network or et out of order being detected, thus utilize storage battery to continue power supply a period of time to eddy current coil when the unexpected power-off of electrical network or et out of order, be enough to allow swing type mechanism normal brake application, effectively prevent that the eddy current brake that grid cut-off or et out of order bring was lost efficacy, risk out of control.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 a-1b is rotary braking system architecture schematic diagram disclosed in the embodiment of the present invention one;
Fig. 1 c is control relay circuit structural representation disclosed in the embodiment of the present invention one;
Fig. 1 d is half-wave controlled rectification circuit structural representation disclosed in the embodiment of the present invention one;
Fig. 1 e is the input and output voltage mode chart of half-wave controlled rectification circuit shown in Fig. 1 d;
Fig. 2 is rotary braking system architecture schematic diagram disclosed in the embodiment of the present invention two;
Fig. 3 is tower crane control system structural representation disclosed in the embodiment of the present invention three;
Fig. 4 is the embodiment of the present invention three another tower crane control system structural representation disclosed;
Fig. 5 is a kind of tower crane control system structural representation disclosed in the embodiment of the present invention four.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one:
See Fig. 1 a-1b, the embodiment of the present invention one discloses a kind of rotary braking system, with prevent grid cut-off or et out of order (as failure conditions such as electrical network phase shortage or instant power-downs) the eddy current brake that brings lost efficacy, risk out of control, comprise revolution drag circuit 110 and revolution eddy current brake circuit 120;
Revolution drag circuit 110 comprises: the K switch M automatically closed when the unexpected power-off of electrical network or et out of order, the first voltage transformer 111, rectifying circuit 112 and BK Brake Switch 113 between the revolution power brake source being serially connected in electrical network and tower crane, and the first storage battery 114 of described revolution power brake source is connected to through K switch M and BK Brake Switch 113;
Wherein, K switch M can be controlled automatically by the automatically controlled part of tower crane, total contactless switch KM of the preferred tower crane of K switch M, and the contact of total contactless switch KM is in off-state when electrical network is normal, and automatically closes when the unexpected power-off of electrical network or et out of order;
Revolution eddy current brake circuit 120 comprises mains supply loop L1 and storage battery power supply loop L2, wherein:
Mains supply loop L1 comprises and is serially connected in controlled rectification circuit 121 between electrical network and the eddy current coil of eddy current motor and external control relay K A1 (employing normally closed contact), but does not limit to;
Storage battery power supply loop L2 comprises the second voltage transformer 122, current rectifying and wave filtering circuit 123, charge circuit 124, second storage battery 125 and the internal piloting relay K A2 that are serially connected between electrical network and described eddy current coil, and is connected with internal piloting relay K A2, for controlling the control relay circuit 126 of the open contact adhesive of internal piloting relay K A2 when the unexpected power-off of electrical network or et out of order.
The driving of eddy current motor is realized by frequency converter, and the braking of eddy current motor is realized by described rotary braking system, comprises drag and eddy current brake two kinds of braking models.
In revolution drag circuit 110, line voltage is rated voltage through the first voltage transformer 111 step-down, rectifying circuit 112 rectification, driver close BK Brake Switch 113 and zero-bit got to by driver's cab master controller time, described rated voltage sends into the revolution power brake source of tower crane, described revolution power brake source is for being supplied to the revolution brake gear of tower crane, and the coil of revolution brake gear obtains electric rear band-type brake.Can not work for preventing turning round brake gear when grid cut-off or et out of order, the present embodiment has connect the first storage battery 114 after rectifying circuit 112, the switching in this loop is controlled by total contactless switch KM, contact automatic pick when grid cut-off or et out of order of total contactless switch KM, make the first storage battery 114 be that the coil turning round brake gear continues power supply a period of time, avoid drag to lose efficacy.It should be noted that, because swing type mechanism inertia is large, therefore require that revolution brake gear only uses when eddy current braking device fault.
In revolution eddy current brake circuit 120, there are mains supply loop L1 and storage battery power supply loop L2 two current supply circuits.When electrical network is normal, line voltage is powered to eddy current coil by mains supply loop L1, controlled rectification circuit 121 realizes the stepless output of voltage by the size changing conduction angle, and namely achieve the stepless adjustable of eddy current brake power supply, described eddy current brake power supply is used for being supplied to eddy current motor; The on off mode of external control relay K A1, by the Frequency Converter Control of tower crane, can control the normally closed contact disconnection of external control relay K A1 when frequency converter runs, to avoid occurring that eddy current motor drives and brakes the misoperation performed simultaneously; The normally closed contact suction that can control external control relay K A1 when frequency converter does not run is closed, and to export eddy current brake power supply, makes eddy current coil obtain electric, eddy current motor braking.
Meanwhile, the second voltage transformer 122 in the L2 of storage battery power supply loop can carry out step-down process when electrical network is normal to the line voltage of input, and flows to current rectifying and wave filtering circuit 123 by processing the low-voltage AC obtained; Current rectifying and wave filtering circuit 123 sends into charge circuit 124 after converting the low-voltage AC received to stable low-voltage DC; Charge circuit 124 is that the second storage battery 125 charges afterwards, until the second storage battery 125 charging complete, visible, and revolution eddy current brake unit 120 has storage battery automatic charging function.In addition, control relay circuit 126 controls the open contact adhesive of internal piloting relay K A2 automatically when the unexpected power-off of electrical network or et out of order being detected, thus utilize the second storage battery 125 to continue power supply a period of time to eddy current coil when the unexpected power-off of electrical network or et out of order, be enough to allow swing type mechanism normal brake application, thus effectively prevent that the eddy current brake that grid cut-off or et out of order bring was lost efficacy, risk out of control, solve prior art Problems existing.
Below, the present embodiment provides the topological structure of control relay circuit 126 and controlled rectification circuit 121, hardware module conventional in prior art can be adopted to realize, do not repeat at this as current rectifying and wave filtering circuit 123 and charge circuit 124.
Control relay circuit 126 can adopt topology shown in Fig. 1 c, but is not limited thereto.It comprises the first diode D1, the second diode D2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the first electric capacity C1, the first NPN type triode VT1 and NMOS tube Q1, wherein (in the accompanying drawing disclosed in the present embodiment, the coil of internal piloting relay K A2 and the same alphabetic character KA2 of open contact mark; The input side of charge circuit 124 and the same alphabetic character VCC1 of input side voltage mark; The outgoing side of charge circuit 124 and outgoing side voltage, be also positive pole and the cathode voltage of the second storage battery 125, mark with same alphabetic character VCC2):
The anode of the first diode D1 meets the input side VCC1 of charge circuit 124, and its negative electrode is successively through the first resistance R1 and the first electric capacity C1 ground connection; VCC1 is successively through the second resistance R2 and the 3rd resistance R3 ground connection; The point of connection of the first resistance R1 and the first electric capacity C1 is successively through the 4th resistance R4 and the 5th resistance R5 ground connection;
The grounded emitter of the first NPN type triode VT1, its collecting electrode connects the point of connection of the 4th resistance R4 and the 5th resistance R5, and its base stage connects the point of connection of the second resistance R2 and the 3rd resistance R3;
The source ground of NMOS tube Q1, its grid connects the point of connection of the 4th resistance R4 and the 5th resistance R5, and its drain electrode connects the anode of the second diode D2;
The negative electrode of the second diode D2 meets the outgoing side VCC2 of charge circuit 124; The coils from parallel connection of coils of internal piloting relay K A2 is at the second diode D2 two ends.
The principle of work of control relay circuit 126 shown in Fig. 1 c is:
When electrical network is normal, VCC1 charges to the first electric capacity C1 by the first diode D1 and the first resistance R1, makes the first electric capacity C1 obtain left positive right negative charging valtage; The bleeder circuit that VCC1 is consisted of the second resistance R2 and the 3rd resistance R3 simultaneously drives the first NPN type triode VT1 conducting; After VT1 conducting, the grid potential of NMOS tube Q1 is dragged down, and NMOS tube Q1 turns off; NMOS tube Q1 closes the coil no power of the internal piloting relay K A2 that has no progeny, and its open contact is in off-state, and storage battery 40 can not be powered to eddy current coil.
When grid cut-off or et out of order, the first electric capacity C1 is discharged by the 4th resistance R4 and the 5th resistance R5, and the grid potential of NMOS tube Q1 is driven high, NMOS tube Q1 conducting; The coil electricity of internal piloting relay K A2 after NMOS tube Q1 conducting, its open contact adhesive, storage battery 40 starts to power to eddy current coil.The capacitance of the first electric capacity C1 and the resistance size of the 4th resistance R4 and the 5th resistance R5, what determine NMOS tube Q1 opens duration, also namely the duration of storage battery 40 connected by grid cut-off or et out of order backwash coil, and the braking duration that can need according to tower crane when practical application is rationally arranged.
Wherein, due to the reverse cut-off effect of the first diode D1, the base stage that the discharge current of the first electric capacity C1 can not flow to the first NPN type triode VT1 makes the first NPN type triode VT1 conducting, therefore also the grid potential of NMOS tube Q1 would not be dragged down after the first NPN type triode VT1 conducting.Second diode D2 provides continuous current circuit to its coil in the moment that the open contact of internal piloting relay K A2 disconnects, and NMOS tube Q1 overvoltage can be avoided to burn.
In addition, still see Fig. 1 c, when internal piloting relay K A2 being closed by mistake for preventing control relay circuit 126 et out of order, the energy coming from mains supply loop pours in down a chimney and causes the second storage battery 125 to damage into the second storage battery 125, and control relay circuit 126 also can comprise: the reverse-filling diode D3 of position second storage battery 125 outgoing side.
Finally it should be noted that, in topology disclosed in Fig. 2, the first NPN type triode VT1 can be replaced NMOS tube, and NMOS tube Q1 can be replaced NPN type triode.
Controlled rectification circuit 121 is half-wave controlled rectification circuit preferably, shown in its topology diagram 1d, but does not limit to.It comprises the 4th diode D4, the first thyristor PUTT1, the second thyristor SCR1, the first stabilivolt ZD1, the 13 resistance R13, the 14 resistance R14, the 15 resistance R15, the 16 resistance R16, the 17 resistance R17, the 18 resistance R18, adjustable resistance POT1, the 3rd electric capacity C3 and the 5th diode D5, wherein:
The high potential input end AC1 that the anode of the 4th diode D4 gets access to grid through the 13 resistance R13, its negative electrode connects the first end of the 16 resistance R16 successively through the 14 resistance R14 and the 15 resistance R15;
The low voltage input end AC2 of the second termination electrical network of the 16 resistance R16;
The control pole G of the first thyristor PUTT1 connects the point of connection of the 14 resistance R14 and the 15 resistance R15, its negative electrode K connects the first end of the 16 resistance R16 through the 18 resistance R18, its anode A connects the first end of the 16 resistance R16 through the 3rd electric capacity C3, and anode A also connects the negative electrode of the 4th diode D4 successively through adjustable resistance POT1 and the 17 resistance R17 simultaneously;
The control pole G of the second thyristor SCR1 meets the negative electrode K of the first thyristor PUTT1, and its negative electrode K connects the first end of the 16 resistance R16, the high potential input end AC1 that its anode A gets access to grid;
First stabilivolt ZD1 is connected in parallel on the 14 resistance R14 and the 15 resistance R15 two ends, and its anode is connected on the 15 resistance R15 side, and its negative electrode is connected on the 14 resistance R14 side;
The anode of the first stabilivolt ZD1 meets the first end K1 of external control relay K A1, the low voltage input end AC2 that the second end K2 of external control relay K A1 gets access to grid; Eddy current coil meets K2 and AC2;
The anode of the 6th diode D6 connects second end of the 16 resistance R16, and its negative electrode connects the first end of the 16 resistance R16.
The principle of work of described half-wave controlled rectification circuit is: when the line voltage inputted is positive half-wave, the 13 resistance R13, the 4th diode D4, the 14 resistance R14, the 15 resistance R15 and the 16 resistance R16 have electric current to flow through; When being conducting to certain angle, the total dividing potential drop on the 15 resistance R15 and the 16 resistance R16 can reach the threshold voltage of the first stabilivolt ZD1, as 16V, now the first stabilivolt ZD1 start reverse-conducting and voltage stabilizing at 16V; Simultaneously, electrical network provides drive current through the 13 resistance R13, the 4th diode D4, the 14 resistance R14 to the control pole G of the first thyristor PUTT1, and charges to the 3rd electric capacity C3 through the 13 resistance R13, the 4th diode D4, the 17 resistance R17, adjustable resistance POT1;
When the 3rd electric capacity C3 both end voltage charges to certain value, the first thyristor PUTT1 conducting also provides drive current to the second thyristor SCR1, makes the second thyristor SCR1 also conducting thereupon;
When the line voltage inputted is for negative half-wave, the second thyristor SCR1 automatically shuts down, described half-wave controlled rectification circuit Non voltage output; 16 resistance R16 is used for providing fictitious load loop when not connecing eddy current coil to the second thyristor SCR1.
As preferably, still see Fig. 1 d, described half-wave controlled rectification circuit also can comprise the 6th diode D6, the 19 resistance R19, the 20 resistance R20, the second stabilivolt ZD2 and the second LED 2, wherein:
The anode of the 5th diode D5 connects second end of the 16 resistance R16, and its negative electrode meets the second end K2 of external control relay K A1;
The negative electrode of the second stabilivolt ZD2 meets the second end K2 of external control relay K A1 through the 19 resistance R19, its anode meets AC2; The second stabilivolt ZD2 two ends are connected in parallel on again after 20 resistance R20 and the series connection of the second LED 2.
6th diode D6 plays afterflow function, provides continuous current circuit when outside control relay KA1 disconnects to eddy current coil; R19, R20, ZD2 and LED2 form instruction loop, and when eddy current coil is braked, the second LED 2 is energized shinny, convenient for maintaining and inspection.
As preferably, still see Fig. 1 d, described half-wave controlled rectification circuit also can comprise the pizo-resistance VR1 being arranged at grid side, plays lightning protection effect.
As preferably, still see Fig. 1 d, described in state half-wave controlled rectification circuit and also can comprise the fuse FU being arranged at grid side, as the protector of short circuit and excess current.
As can be seen from foregoing description, the present embodiment, when electrical network is normal, utilizes controlled rectification circuit 121 to achieve the stepless adjustable of eddy current brake power supply, can meet different braking device voltage requirements, and adjustable braking force size, makes braking more steady simultaneously; Simultaneously, the present embodiment by accessing internal piloting relay K A2 and relay control circuit 126 on the storage battery power supply loop L2 of eddy current coil, and the open contact adhesive of internal piloting relay K A2 is controlled when the unexpected power-off of electrical network or et out of order being detected, thus utilize the second storage battery 125 to continue power supply a period of time to eddy current coil when the unexpected power-off of electrical network or et out of order, be enough to allow swing type mechanism normal brake application, effectively prevent that the eddy current brake that grid cut-off or et out of order bring was lost efficacy, risk out of control.
Embodiment two:
See Fig. 2, the embodiment of the present invention two discloses another rotary braking system, and the eddy current brake brought to prevent grid cut-off or et out of order was lost efficacy, risk out of control, comprises revolution drag circuit 110 and revolution eddy current brake circuit 120;
Revolution drag circuit 110 comprises: the first controlled rectification circuit 111 between the revolution power brake source being serially connected in electrical network and tower crane and BK Brake Switch 112;
Revolution eddy current brake circuit 120 comprises mains supply loop L1 and storage battery power supply loop L2, wherein:
Mains supply loop L1 comprises and is serially connected in the second controlled rectification circuit 121 between electrical network and the eddy current coil of eddy current motor and external control relay K A1, but does not limit to;
Storage battery power supply loop L2 comprises the voltage transformer 122, current rectifying and wave filtering circuit 123, charge circuit 124, storage battery 125 and the internal piloting relay K A2 that are serially connected between electrical network and described eddy current coil, and is connected with internal piloting relay K A2, for controlling the control relay circuit 126 of the open contact adhesive of internal piloting relay K A2 when the unexpected power-off of electrical network or et out of order; Storage battery 125 also connects described revolution power brake source through internal piloting relay K A2.
Wherein, the first controlled rectification circuit 111 and/or the second controlled rectification circuit 121 preferably half-wave controlled rectification circuit, its circuit topological structure reference example one, but do not limit to.
In the present embodiment, revolution eddy current brake circuit 120 can realize the stepless adjustable of eddy current brake power supply, and the eddy current brake effectively preventing grid cut-off or et out of order from bringing was lost efficacy, risk out of control, solve prior art Problems existing, its structure and principle of work identical with embodiment one, repeat no more herein.The difference part of the present embodiment and embodiment one is only, revolution drag circuit 110 is improved: after driver closes BK Brake Switch 112 zero-bit got to by driver's cab master controller simultaneously, line voltage exports revolution power brake source to through the first controlled rectification circuit 111, achieve the stepless adjustable of drag circuit 110 output voltage, unequally loaded power requirement can be met.When grid cut-off or et out of order, due to the open contact adhesive under the control of control relay circuit 126 of internal piloting relay K A2, therefore storage battery 125 can be revolution brake gear continuation power supply a period of time, is enough to the coil band-type brake ensureing revolution brake gear.
Embodiment three:
See Fig. 3, the embodiment of the present invention three discloses a kind of tower crane control system, the eddy current brake brought to prevent grid cut-off or et out of order was lost efficacy, risk out of control, comprise eddy current motor M1, for driving the frequency converter 10 of eddy current motor M1, and for braking the rotary braking system 20 of eddy current motor M1; Wherein, rotary braking system 20 adopts structure disclosed in embodiment one.
Described tower crane control system adopts frequency conversion drive, eddy current brake, to realize the revolution action of crane arm to eddy current motor M1.In frequency conversion drive, the signals such as operation signal that driver's cab master controller sends (as zero-bit, left-hand rotation, right-hand rotation, second gear speed, third gear is fast, fourth gear is fast) and failure reset connect the On-off signal port of frequency converter 10, by monitoring the different conditions of master controller, and frequency converter 10 parameter fully, is reasonably set according to sector application experience, the smoothly adjustable-speed of frequency converter 10 couples of eddy current motor M1 can be realized, adapt to the complicated and changeable of field working conditions.In eddy current brake, be then rely on rotary braking system 20 to realize, repeat no more herein.
Wherein, the squirrel cage asynchronous motor of eddy current motor M1 preferably with eddy current coil.Compared to the wire-wound asynchronous motor of band eddy current coil that prior art adopts, the squirrel cage asynchronous motor of band eddy current coil has that cost is low, reliability is high, start-up and operation is steady, brake the advantage such as quick and precisely steady, in place.
Wherein, the frequency converter of frequency converter 10 preferably with braking resistor R.Eddy current motor M1, in braking procedure, because effect of inertia can produce a large amount of regenerative electric energies, if consume this part regenerative electric energy not in time, will directly act on the direct current circuit part of frequency converter 10, frequency converter 10 is damaged; And the effect of braking resistor R is exactly consume this part regenerative electric energy when braking, thus protection frequency converter 10 is not damaged.
As preferably, see Fig. 4 (eddy current motor and frequency converter not shown), the luffing power brake source of the outgoing side access tower crane of the rectifying circuit 112 in the rotary braking system of described tower crane control system; The first storage battery 114 in described rotary braking system accesses described luffing power brake source through total contactless switch KM.Described luffing power brake source, for being supplied to the luffing brake gear of tower crane, because luffing brake gear can directly power taking from rotary braking system, need not additionally arranging luffing power brake source again, therefore save complete machine cost.
Embodiment four:
The embodiment of the present invention four discloses another tower crane control system, the eddy current brake brought to prevent grid cut-off or et out of order was lost efficacy, risk out of control, comprise eddy current motor, for driving the frequency converter of described eddy current motor, and for braking the rotary braking system of described eddy current motor; Wherein, described rotary braking system adopts structure disclosed in embodiment two.
Wherein, the squirrel cage asynchronous motor of described eddy current motor preferably with eddy current coil.
Wherein, the frequency converter of described frequency converter preferably with braking resistor.
As preferably, see Fig. 5 (eddy current motor and frequency converter not shown), the first controlled rectification circuit 111 in the rotary braking system of described tower crane control system connects the luffing power brake source of tower crane, storage battery 125 in described rotary braking system also connects described luffing power brake source through internal piloting relay K A2, make luffing power brake source can directly power taking from described rotary braking system, for being supplied to luffing brake gear, complete machine cost can be saved.
As preferably, still see Fig. 5, described tower crane control system also comprises: the first diode D1 that anode connects the first controlled rectification circuit 111, negative electrode connects luffing power brake source; Anode connects the first controlled rectification circuit 111, negative electrode takes back the second diode D2 turning power brake source; Anode meets internal piloting relay K A2, negative electrode takes back the 3rd diode D3 turning power brake source; The 4th diode D4 that anode meets internal piloting relay K A2, negative electrode connects luffing power brake source; And the 5th diode D5 that anode meets internal piloting relay K A2, negative electrode connects eddy current coil.The technique effect of the program is: the unilateral conductivity utilizing D1 ~ D5, can prevent the current direction eddy current coil of the first controlled rectification circuit 111, can prevent the current direction of the second controlled rectification circuit 121 from turning round power brake source or luffing power brake source, can prevent eddy current coil from having current direction to turn round power brake source or luffing power brake source and can prevent revolution power brake source or luffing power brake source from having current direction eddy current coil.
In sum, the present invention is cut-in relay and control relay circuit on the storage battery power supply loop of eddy current coil, and the open contact adhesive of described relay is controlled when the unexpected power-off of electrical network or et out of order being detected, thus utilize storage battery to continue power supply a period of time to eddy current coil when the unexpected power-off of electrical network or et out of order, be enough to allow swing type mechanism normal brake application, effectively prevent that the eddy current brake that grid cut-off or et out of order bring was lost efficacy, risk out of control.
In this specification sheets, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the embodiment of the present invention, can realize in other embodiments.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (13)
1. a rotary braking system, is characterized in that, comprises revolution drag circuit and revolution eddy current brake circuit;
Described revolution drag circuit comprises: the switch automatically closed when the unexpected power-off of electrical network or et out of order, the first voltage transformer, rectifying circuit and BK Brake Switch between the revolution power brake source being serially connected in electrical network and tower crane, and the first storage battery of described revolution power brake source is connected to through described switch and described BK Brake Switch;
Described revolution eddy current brake circuit comprises mains supply loop and storage battery power supply loop, wherein said storage battery power supply loop comprises: be serially connected in the second voltage transformer between electrical network and the eddy current coil of eddy current motor, current rectifying and wave filtering circuit, charge circuit, the second storage battery and internal piloting relay, and is connected with described internal piloting relay, for controlling the control relay circuit of the open contact adhesive of described internal piloting relay when the unexpected power-off of electrical network or et out of order.
2. rotary braking system according to claim 1, is characterized in that, described mains supply loop comprises and is serially connected in controlled rectification circuit between electrical network and described eddy current coil and external control relay.
3. rotary braking system according to claim 2, is characterized in that, described controlled rectification circuit is half-wave controlled rectification circuit.
4. a rotary braking system, is characterized in that, comprises revolution drag circuit and revolution eddy current brake circuit;
Described revolution drag circuit comprises: the first controlled rectification circuit between the revolution power brake source being serially connected in electrical network and tower crane and BK Brake Switch;
Described revolution eddy current brake circuit comprises mains supply loop and storage battery power supply loop, wherein said storage battery power supply loop comprises: be serially connected in the voltage transformer between electrical network and the eddy current coil of eddy current motor, current rectifying and wave filtering circuit, charge circuit, storage battery and internal piloting relay, and is connected with described internal piloting relay, for controlling the control relay circuit of the open contact adhesive of described internal piloting relay when the unexpected power-off of electrical network or et out of order; Described storage battery also connects described revolution power brake source through described internal piloting relay.
5. rotary braking system according to claim 4, is characterized in that, described mains supply loop comprises and is serially connected in the second controlled rectification circuit between electrical network and described eddy current coil and external control relay.
6. rotary braking system according to claim 5, is characterized in that, described first controlled rectification circuit and/or described second controlled rectification circuit are half-wave controlled rectification circuit.
7. a tower crane control system, is characterized in that, comprises eddy current motor, for driving the frequency converter of described eddy current motor, and for braking the rotary braking system of described eddy current motor, wherein:
Described rotary braking system is the rotary braking system described in claim 1,2 or 3.
8. tower crane brake system according to claim 7, is characterized in that, described eddy current motor is the squirrel cage asynchronous motor of band eddy current coil.
9. the tower crane control system according to claim 7 or 8, is characterized in that, the luffing power brake source of the outgoing side access tower crane of the rectifying circuit in described rotary braking system; The first storage battery in described rotary braking system accesses described luffing power brake source through described switch.
10. a tower crane control system, is characterized in that, comprises eddy current motor, for driving the frequency converter of described eddy current motor, and for braking the rotary braking system of described eddy current motor, wherein:
Described rotary braking system is the rotary braking system described in claim 4,5 or 6.
11. tower crane brake system according to claim 10, is characterized in that, described eddy current motor is the squirrel cage asynchronous motor of band eddy current coil.
12. tower crane control system according to claim 10 or 11, it is characterized in that, the mouth of the first controlled rectification circuit in described rotary braking system also connects the luffing power brake source of tower crane, and the storage battery in described rotary braking system also connects described luffing power brake source through internal piloting relay.
13. tower crane control system according to claim 12, is characterized in that, described tower crane control system also comprises: the first diode that anode connects described first controlled rectification circuit, negative electrode connects described luffing power brake source; The second diode that anode connects described first controlled rectification circuit, negative electrode connects described revolution power brake source; The 3rd diode that anode connects described internal piloting relay, negative electrode connects described revolution power brake source; The 4th diode that anode connects described internal piloting relay, negative electrode connects described luffing power brake source; And the 5th diode that anode connects described internal piloting relay, negative electrode connects described eddy current coil.
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| CN201510004635.3A CN104555764B (en) | 2015-01-05 | 2015-01-05 | Rotary braking system and tower crane control system |
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| CN201510004635.3A CN104555764B (en) | 2015-01-05 | 2015-01-05 | Rotary braking system and tower crane control system |
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| CN107287714A (en) * | 2017-07-23 | 2017-10-24 | 经纬纺织机械股份有限公司 | A kind of device for controlling spinning frame synchronously to stop |
| CN115506440A (en) * | 2022-08-26 | 2022-12-23 | 太原欧陆机电工程有限公司 | Intelligent protection system and method for out-of-rotation control and computer equipment |
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| CN104555764B (en) | 2017-08-29 |
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