CN103588036A - Pay-off reel speed auto-control device and pay-off system with same - Google Patents
Pay-off reel speed auto-control device and pay-off system with same Download PDFInfo
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- CN103588036A CN103588036A CN201310477707.7A CN201310477707A CN103588036A CN 103588036 A CN103588036 A CN 103588036A CN 201310477707 A CN201310477707 A CN 201310477707A CN 103588036 A CN103588036 A CN 103588036A
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Abstract
A pay-off system with a pay-off reel speed auto-control device comprises a plurality of pay-off reels, a guide rack I, a guide rack II, a traction cart, a guide rail rack, and a winch, wherein the components are connected in sequence. The pay-off reel speed auto-control device is mounted between the guide rack I and the guide rack II and comprises a speed sensing part, an electric control part and a pneumatic brake. The speed sensing part comprises stop rolls, a float roll guide rail, a sensor, a float roll and a base. The stop rolls disposed on two sides of a wire material and functioning in protection are fixed on the base. The float roll guide rail, disposed behind the stop rolls, and the stop rolls are parallelly and fixedly mounted on the base. The float roll is disposed on the float roll guide rail. An upper limit sensor and a lower limit sensor are mounted at upper and lower ends of the float roll guide rail respectively. When the pay-off system is in service, the wire material is right below the float roll. The pay-off reel speed auto-control device can automatically adjust the pay-off reel speed during production or construction process, and production or construction cost can be reduced.
Description
Technical field
The present invention relates to a kind of bridge cable produces or construction machinery and equipment, particularly a kind of steel wire with automatic control device or steel strand paying off system and draw drum auto speed control device thereof.
Background technology
Current actinobacillus device is controlled draw drum speed in the method for producing or the control of work progress medium velocity adopts foot-operated switch control air valve break-make to carry out aerobraking conventionally, general technological process (referring to Fig. 1) is: trailer wagon is under the drive of winch, material is pulled out from several draw drums, after silk guide frame I and silk guide frame II, guide rail bracket and the severing of cut-to-length device, complete fixed-length blanking; In whole technological process, because the material tightness on each draw drum is inconsistent, it is with respect to drum width between centers inconsistent (material leave draw drum place radius of rotation inconsistent), and the material one end linear velocity being fixed on trailer wagon is identical, so each draw drum rotative speed under the drive of dolly is also inconsistent, if trailer wagon is not controlled separately drum speed in acceleration or braking procedure, existence due to force of inertia, this will cause material to get loose and eject draw drum, and impact is normal produces or construction; Now, conventionally by operative employee, judge the speed demand for control to draw drum, when needs slow down draw drum rotating speed, tramp with one's feet to step on and trample switch, two-position three-way valve is connected pneumatic braking device source of the gas, and pneumatic braking device clamping brake disc is implemented to draw drum braking, then, depending on demand for control, unclamp and trample switch, two-position three-way valve is connected pneumatic braking device exhausr port, pneumatic braking device exhaust, take-off the brake dish, removes the braking to draw drum.Maker or construction party improve production or operating efficiency by the method for a blowing quantity of continuous increase conventionally, and this also means that draw drum quantity is also increasing; Therefore adopt the method for manual control draw drum speed to have the following disadvantages: 1, manual observation to respond the required time long, and the in the situation that of a plurality of drum, often there is the phenomenon of attending to one thing and lose sight of another, cannot realize the ability that the same time controls a plurality of drums, control accuracy is low; 2, dangerous high, in production process, drum High Rotation Speed, manual control needs close-ups and operation, dangerous high; 3, unwrapping wire drum quantity increases, and the personnel of input increase, and causes producing or construction cost increase.
Summary of the invention
The object of the present invention is to provide a kind of draw drum auto speed control device and with the paying off system of this device and realize the method that draw drum speed is controlled automatically, this draw drum auto speed control device can be adjusted automatically to drum speed in production or work progress, and can realize multi-thread dish and control simultaneously, improve control accuracy and product design, reduce and produce or construction cost.
For addressing the above problem, the technical scheme that the present invention takes is: a kind of draw drum auto speed control device, it is characterized in that: this draw drum auto speed control device comprises velocity response part, the gentle moving drg of automatically controlled part, described velocity response partly comprises gear roller, dancer guide rail, sensor, dancer and base, and described sensor comprises upper limit sensor and lower limit sensor; The gear roller that be positioned at wire material both sides, wire material is played a protective role is fixedly mounted on base, dancer guide rail be positioned at gear roller after with gear roller be fixedly mounted on abreast on base, dancer is placed on dancer guide rail, upper and lower limit level sensor is arranged on respectively the two ends up and down of dancer guide rail, during use, material is positioned under dancer; Pneumatic braking device is installed on the below of controlled draw drum, coordinates with the brake disc on controlled draw drum;
Described electric control part is divided and is comprised: braking approach switch KT1: lower limit sensor, loosen approach switch KT2: upper limit sensor, intermediate relay M1, intermediate relay M2 and intermediate relay M3, time relay T1, two-bit triplet electromagnetic valve Y1, manual change-over switch K1, automatic transfer switch K2;
When manual change-over switch K1 disconnects, when automatic transfer switch K2 is closed, electric control part is divided into automatic control: if now draw drum rotating speed is too fast, the downwarp of wire material, dancer under Action of Gravity Field with wire material sinking, when dancer triggers braking approach switch KT1: during lower limit sensor, intermediate relay M2 work, simultaneously, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device source of the gas, pneumatic braking device clamping brake disc, braking brake, the tensioning of wire material, dancer rises, when triggering, dancer loosens approach switch KT2: during upper limit sensor, intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device deflation hole, take-off the brake dish, brake off brake.
Its another relevant technical scheme is: a kind of paying off system with draw drum auto speed control device, comprise a plurality of draw drums, silk guide frame I, silk guide frame II, trailer wagon, guide rail bracket, the winch that connect in turn, it is characterized in that: each draw drum is with 1 cover draw drum auto speed control device, the velocity response of this draw drum auto speed control device is partly arranged on the wire material that between silk guide frame I and silk guide frame II, each draw drum is broadcasted, and described draw drum auto speed control device is the above-mentioned draw drum auto speed control device of the present invention;
Described draw drum auto speed control device comprises velocity response part, the gentle moving drg of automatically controlled part, described velocity response partly comprises gear roller, dancer guide rail, sensor, dancer and base, and described sensor comprises upper limit sensor and lower limit sensor; The gear roller that be positioned at wire material both sides, wire material is played a protective role is fixedly mounted on base, dancer guide rail be positioned at gear roller after with gear roller be fixedly mounted on abreast on base, dancer is placed on dancer guide rail, upper and lower limit level sensor is arranged on respectively the two ends up and down of dancer guide rail, during use, thread material level is under dancer; Pneumatic braking device is installed on the below of controlled draw drum, coordinates with the brake disc on controlled draw drum;
Described electric control part is divided and is comprised: braking approach switch KT1: lower limit sensor, loosen approach switch KT2: upper limit sensor, intermediate relay M1, intermediate relay M2 and intermediate relay M3, time relay T1, two-bit triplet electromagnetic valve Y1, manual change-over switch K1, automatic transfer switch K2;
When manual change-over switch K1 disconnects, when automatic transfer switch K2 is closed, electric control part is divided into automatic control: if now draw drum rotating speed is too fast, the downwarp of wire material, dancer under Action of Gravity Field with wire material sinking, when dancer triggers braking approach switch KT1: during lower limit sensor, intermediate relay M2 work, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device source of the gas, pneumatic braking device clamping brake disc, braking brake, the tensioning of wire material, dancer rises, when triggering, dancer loosens approach switch KT2: during upper limit sensor, intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device deflation hole, pneumatic braking device take-off the brake dish, brake off brake.
Its relevant another technical scheme is: a kind of method that draw drum speed is controlled, is characterized in that: it is to adopt draw drum auto speed control device of the present invention to realize the method that the draw drum speed of paying off system is automatically adjusted;
When producing or construct, wire material is emitted from draw drum, after silk guide frame I, draw drum auto speed control device, silk guide frame II, under the dragging of trailer wagon, along guide rail bracket direction, launch, draw drum auto speed control device is in dolly distraction procedure, and the tightness by dancer and sensor sensing material, automatically adjusts to draw drum speed; Described sensor comprises upper limit sensor and lower limit sensor;
Its control process is as follows: under the effect of draw drum at force of inertia, when speed is accelerated suddenly, wire material is in close draw drum place downwarp gradually, dancer under Action of Gravity Field with wire material sinking, when dancer triggers braking approach switch KT1: during lower limit sensor, intermediate relay M2 work, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device source of the gas, pneumatic braking device clamping brake disc, braking brake, the tensioning of wire material, dancer rises, when triggering, dancer loosens approach switch KT2: during upper limit sensor, intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device deflation hole, pneumatic braking device take-off the brake dish, brake off brake.
Owing to adopting technique scheme, the present invention's draw drum auto speed control device and have following beneficial effect with the paying off system of this device:
1. speed of response is fast, and control accuracy is high, can realize multi-thread dish and control simultaneously, improves control accuracy and product design, reduces and produces or construction cost.
Paying off system of the present invention is provided with a draw drum auto speed control device on the wire material that between silk guide frame I 21 and silk guide frame II 22, each draw drum is broadcasted, the dancer of this draw drum auto speed control device synchronously changes with wire material (steel wire or steel strand) height change, can monitor in real time the degree of tightness situation of wire material, and carry out signal feedback simultaneously, by automatically controlled part, realize the automatic control to two-position three-way valve, and then realize draw drum braking and cancel the automatic control of braking, compared with using artificial observation and manual control method in prior art, its speed of response is fast, control accuracy is high, and can enhance productivity, reduce the risk of cost of labor and manual operation.
2. draw drum auto speed control device is rational in infrastructure, can to draw drum speed, adjust in time.
The principle of work of a kind of draw drum auto speed control device of the present invention is as follows: wire material, for example steel wire or steel strand pass from dancer below, during production, two terminal block rollers play a protective role to wire material, under the effect of draw drum at force of inertia, when speed is accelerated suddenly, steel wire or steel strand are in close draw drum place downwarp gradually, dancer falls down with steel wire or steel strand under Action of Gravity Field, instantly limit sensors senses behind the smallest limit position of dancer, send control signal, by automatically controlled part, start two-position three-way valve and connect pneumatic braking device source of the gas, pneumatic braking device clamping brake disc, enforcement is braked draw drum, and slowing down along with draw drum speed, steel wire or steel strand start tensioning, dancer up moves with steel wire or steel strand, when upper level sensor receives the limes superiors position of dancer, send control signal, by automatically controlled part, start two-position three-way valve, connect pneumatic braking device exhausr port, pneumatic braking device exhaust, take-off the brake dish, the braking of releasing to draw drum, guarantee that the tensioning degree of steel wire or steel strand is within the scope of controlling.
Below, in conjunction with the accompanying drawings and embodiments to the present invention's draw drum auto speed control device and with the paying off system of this device and the technical characterictic of realizing the method that draw drum speed controls be further described.
Accompanying drawing explanation
Fig. 1: existing pay-off system structure schematic diagram;
Fig. 2: the present invention is with the pay-off system structure schematic diagram of draw drum auto speed control device;
Fig. 3～Fig. 5: draw drum auto speed control device structural representation of the present invention;
Fig. 3: front view, the left view of Fig. 4: Fig. 3, the A-A cutaway view of Fig. 5: Fig. 3;
Fig. 6: the automatically controlled part circuit structure of draw drum auto speed control device of the present invention;
Fig. 7: the aerobraking schematic diagram of draw drum auto speed control device of the present invention;
Fig. 8: one of draw drum auto speed control device of the present invention installation site schematic diagram on paying off system (velocity response part scheme of installation);
Fig. 9; One of draw drum auto speed control device of the present invention installation site schematic diagram on paying off system (pneumatic braking device installation site schematic diagram).
In figure:
1,101,102-draw drum, the controlled draw drum of 11-, 12-brake disc;
21-silk guide frame I, 22-silk guide frame II;
3,301,302-velocity response part,
31-keeps off roller, 32-dancer guide rail, 33-sensor, 331-lower limit sensor, 332-upper limit sensor, 34-dancer, 35-base;
4,401, the automatically controlled part of 402-;
5,501,502-pneumatic braking device, 51, the cylinder of 52-pneumatic braking device;
6-trailer wagon, 7-guide rail bracket, 8-winch, 9-wire material;
?all the other labels are shown in that embodiment illustrates.
the specific embodiment
Embodiment mono-:
A kind of draw drum auto speed control device, as shown in Fig. 3-Fig. 5, Fig. 8, Fig. 9, this draw drum auto speed control device comprises velocity response part 3, automatically controlled part 4 and pneumatic braking device 5, described velocity response partly comprises gear roller 31, dancer guide rail 32, sensor 33, dancer 34 and base 35, and described sensor 33 comprises upper limit sensor 332 and lower limit sensor 331; The gear roller 31 that be positioned at wire material both sides, steel wire is played a protective role is fixedly mounted on base 35, dancer guide rail 32 is positioned at gear roller 31 and is fixedly mounted on abreast on base 35 with gear roller 31 below, dancer 34 is placed on dancer guide rail 32, upper and lower limit level sensor 332,331 is arranged on respectively the two ends up and down of dancer guide rail 32, during use, wire material 9 is positioned under dancer 34; Pneumatic braking device 5 is installed on the below of controlled draw drum 11, coordinates (referring to Fig. 9) with the brake disc 12 on controlled draw drum 11;
Described automatically controlled part 4 comprises: braking approach switch KT1: lower limit sensor 331, loosen approach switch KT2: upper limit sensor 332, intermediate relay M1(421), intermediate relay M2(422) and intermediate relay M3(423), time relay T1(43), two-bit triplet electromagnetic valve Y1(44), manual change-over switch K1(451), automatic transfer switch K2(452);
As manual change-over switch K1(451) disconnect, when automatic transfer switch K2(452) closed, electric control part is divided into automatic control: if now draw drum rotating speed is too fast, 9 downwarps of wire material, dancer 34 sinks with wire material 9 under Action of Gravity Field, when dancer 34 triggers braking approach switch KT1: during lower limit sensor 331, intermediate relay M2 work, simultaneously, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device 5 sources of the gas, pneumatic braking device 5 clamping brake discs 12, braking brake, steel wire tensioning, dancer 34 rises, when triggering, dancer 34 loosens approach switch KT2: during upper limit sensor 332, intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device 5 deflation holes, pneumatic braking device 5 take-off the brake dishes 12, brake off brake is (referring to Fig. 6, Fig. 7).
Upper and lower limit level sensor 332,331 lead-in wires are connected referring to Fig. 3, Fig. 6 with automatically controlled part.
Embodiment bis-:
A kind of paying off system with draw drum auto speed control device, as shown in Figure 8, this paying off system with draw drum auto speed control device comprises a plurality of draw drums 101 that connect in turn, 102, silk guide frame I 21, silk guide frame II 22, trailer wagon 6, guide rail bracket 7, winch 8, draw drum 101, 102 respectively with 1 cover draw drum auto speed control device, the velocity response part 301 of this draw drum auto speed control device, 302 are arranged on the wire material that between silk guide frame I 21 and silk guide frame II 22, each draw drum is broadcasted, described draw drum auto speed control device is the draw drum auto speed control device described in embodiment mono-,
Each described draw drum auto speed control device comprises velocity response part 3, automatically controlled part 4 and pneumatic braking device 5, described velocity response partly comprises gear roller 31, dancer guide rail 32, sensor 33, dancer 34 and base 35, and described sensor 33 comprises upper limit sensor 332 and lower limit sensor 331; The gear roller 31 that be positioned at wire material both sides, wire material is played a protective role is fixedly mounted on base 35, dancer guide rail 32 is positioned at gear roller 31 and is fixedly mounted on abreast on base 35 with gear roller 31 below, dancer 34 is placed on dancer guide rail 32, upper and lower limit level sensor 332,331 is arranged on respectively the two ends up and down of dancer guide rail 32, during use, wire material 9 is positioned under dancer 34; Pneumatic braking device 5 is installed on the below of controlled draw drum 11, coordinates with the brake disc 12 on controlled draw drum;
Described automatically controlled part 4 comprises: braking approach switch KT1: lower limit sensor 331, loosen approach switch KT2: upper limit sensor 332, intermediate relay M1(421), intermediate relay M2(422) and intermediate relay M3(423), time relay T1(43), two-bit triplet electromagnetic valve Y1(44), manual change-over switch K1 (451), automatic transfer switch K2(452);
As manual change-over switch K1(451) disconnect, when automatic transfer switch K2(452) closed, electric control part is divided into automatic control: if now draw drum rotating speed is too fast, 9 downwarps of wire material, dancer 34 sinks with wire material 9 under Action of Gravity Field, when dancer 34 triggers braking approach switch KT1: during lower limit sensor 331, intermediate relay M2 work, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device 5 sources of the gas, pneumatic braking device 5 clamping brake discs 12, braking brake, 9 tensionings of wire material, dancer rises, when triggering, dancer 34 loosens approach switch KT2: during upper limit sensor 332, intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device 5 deflation holes, pneumatic braking device 5 take-off the brake dishes 12, brake off brake.
Embodiment tri-:
The method that draw drum speed is controlled, it is to adopt draw drum auto speed control device described in embodiment mono-to realize the method automatically adjusting with the draw drum speed of the paying off system of draw drum auto speed control device to described in embodiment bis-;
When producing or construct, wire material 9 is emitted from draw drum, after silk guide frame I 21, draw drum auto speed control device, silk guide frame II 22, under the dragging of trailer wagon 6, along guide rail bracket direction, launch, draw drum auto speed control device is in dolly distraction procedure, and the tightness by dancer 34 and sensor 33 induction materials, automatically adjusts to draw drum speed; Described sensor 33 comprises upper limit sensor 332 and lower limit sensor 331;
Its control process is as follows: under the effect of draw drum at force of inertia, when speed is accelerated suddenly, wire material 9 is in close draw drum place downwarp gradually, dancer 34 sinks with wire material 9 under Action of Gravity Field, when dancer 34 triggers braking approach switch KT1: during lower limit sensor 331, intermediate relay M2 work, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device 5 sources of the gas, pneumatic braking device clamping brake disc 12, braking brake, 9 tensionings of wire material, dancer 34 rises, when triggering, dancer 34 loosens approach switch KT2: during upper limit sensor 332, intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device 5 deflation holes, pneumatic braking device 5 take-off the brake dishes 12, brake off brake.
In various embodiments of the present invention, described wire material 9 comprises steel wire or steel strand; It can also be other the wire material of making bridge cable.
Claims (5)
1. a draw drum auto speed control device, it is characterized in that: this draw drum auto speed control device comprises velocity response part (3), automatically controlled part (4) and pneumatic braking device (5), described velocity response partly comprises gear roller (31), dancer guide rail (32), sensor (33), dancer (34) and base (35), and described sensor (33) comprises upper limit sensor (332) and lower limit sensor (331); The gear roller (31) that be positioned at wire material both sides, wire material is played a protective role is fixedly mounted on base (35), dancer guide rail (32) is positioned at gear roller (31) and is fixedly mounted on abreast on base (35) with gear roller (31) below, dancer (34) is placed on dancer guide rail (32), upper and lower limit level sensor (332,331) is arranged on respectively the two ends up and down of dancer guide rail (32), during use, wire material (9) is positioned under dancer (34); Pneumatic braking device (5) is installed on the below of controlled draw drum (11), coordinates with the brake disc (12) on controlled draw drum (11);
Described automatically controlled part (4) comprising: braking approach switch KT1: lower limit sensor (331), loosen approach switch KT2: upper limit sensor (332), intermediate relay M1(421), intermediate relay M2(422) and intermediate relay M3(423), time relay T1(43), two-bit triplet electromagnetic valve Y1(44), manual change-over switch K1 (451), automatic transfer switch K2(452);
As manual change-over switch K1(451) disconnect, when automatic transfer switch K2(452) closed, electric control part is divided into automatic control: if now draw drum rotating speed is too fast, wire material (9) downwarp, dancer (34) sinks with wire material (9) under Action of Gravity Field, when dancer (34) triggers braking approach switch KT1: during lower limit sensor (331), intermediate relay M2 work, simultaneously, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device (5) source of the gas, pneumatic braking device (5) clamping brake disc (12), braking brake, wire material (9) tensioning, dancer (34) rises, when triggering, dancer (34) loosens approach switch KT2: during upper limit sensor (332), intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device (5) deflation hole, take-off the brake dish (12), brake off brake.
2. the paying off system with draw drum auto speed control device, comprise a plurality of draw drums (1) that connect in turn, silk guide frame I (21), silk guide frame II (22), trailer wagon (6), guide rail bracket (7), winch (8), it is characterized in that: each draw drum is with 1 cover draw drum auto speed control device, the velocity response of this draw drum auto speed control device is partly arranged on the wire material that between silk guide frame I (21) and silk guide frame II (22), each draw drum is broadcasted, described draw drum auto speed control device is draw drum auto speed control device claimed in claim 1,
Described draw drum auto speed control device comprises velocity response part (3), automatically controlled part (4) and pneumatic braking device (5), described velocity response partly comprises gear roller (31), dancer guide rail (32), sensor (33), dancer (34) and base (35), and described sensor (33) comprises upper limit sensor (332) and lower limit sensor (331); The gear roller (31) that be positioned at wire material both sides, wire material is played a protective role is fixedly mounted on base (35), dancer guide rail (32) is positioned at gear roller (31) and is fixedly mounted on abreast on base (35) with gear roller (31) below, dancer (34) is placed on dancer guide rail (32), upper and lower limit level sensor (332,331) is arranged on respectively the two ends up and down of dancer guide rail (32), during use, wire material (9) is positioned under dancer (34); Pneumatic braking device (5) is installed on the below of controlled draw drum (11), coordinates with the brake disc (12) on controlled draw drum (11);
Described automatically controlled part (4) comprising: braking approach switch KT1: lower limit sensor (331), loosen approach switch KT2: upper limit sensor (332), intermediate relay M1(421), intermediate relay M2(422) and intermediate relay M3(423), time relay T1(43), two-bit triplet electromagnetic valve Y1(44), manual change-over switch K1 (451), automatic transfer switch K2(452);
As manual change-over switch K1(451) disconnect, when automatic transfer switch K2(452) closed, electric control part is divided into automatic control: if now draw drum rotating speed is too fast, wire material (9) downwarp, dancer (34) sinks with wire material (9) under Action of Gravity Field, when dancer (34) triggers braking approach switch KT1: during lower limit sensor (331), intermediate relay M2 work, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device (5) source of the gas, pneumatic braking device clamping brake disc (12), braking brake, wire material (9) tensioning, dancer (34) rises, when triggering, dancer (34) loosens approach switch KT2: during upper limit sensor (332), intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device (5) deflation hole, pneumatic braking device (5) take-off the brake dish (12), brake off brake.
3. the paying off system with draw drum auto speed control device according to claim 2, is characterized in that: described wire material (9) comprises steel wire or steel strand or makes other wire material of bridge cable.
4. the method that draw drum speed is controlled, is characterized in that: it is to adopt draw drum auto speed control device described in claim 1 to realize the method automatically adjusting with the draw drum speed of the paying off system of draw drum auto speed control device to described in claim 2;
When producing or construct, wire material (9) is emitted from draw drum, after silk guide frame I (21), draw drum auto speed control device, silk guide frame II (22), under the dragging of trailer wagon (6), along guide rail bracket direction, launch, draw drum auto speed control device is in dolly distraction procedure, and the tightness by dancer (34) and sensor (33) induction wire material (9), automatically adjusts to draw drum speed; Described sensor (33) comprises upper limit sensor (332) and lower limit sensor (331);
Its control process is as follows: under the effect of draw drum at force of inertia, when speed is accelerated suddenly, wire material (9) is in close draw drum place downwarp gradually, dancer (34) sinks with wire material (9) under Action of Gravity Field, when dancer (34) triggers braking approach switch KT1: during lower limit sensor (331), intermediate relay M2 work, intermediate relay M1 and time relay T1 also work, two-position three-way valve Y1 connects pneumatic braking device (5) source of the gas, pneumatic braking device clamping brake disc (12), braking brake, wire material (9) tensioning, dancer (34) rises, when triggering, dancer (34) loosens approach switch KT2: during upper limit sensor (332), intermediate relay M3 work, intermediate relay M1 quits work, two-position three-way valve Y1 connects pneumatic braking device (5) deflation hole, pneumatic braking device (5) take-off the brake dish (12), brake off brake.
5. the method that draw drum speed according to claim 4 is controlled, is characterized in that: described wire material (9) comprises steel wire or steel strand or makes other wire material of bridge cable.
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