Efficient composite brake mode alternating-current variable-frequency winch and lowering control method thereof
Technical Field
The invention belongs to the technical field of petroleum drilling and production equipment, and particularly relates to an efficient composite brake mode alternating-current variable-frequency winch.
Background
The winch is one of three working machines of an oil drilling machine, is the most important equipment in drilling equipment, is mechanical transmission equipment integrating current collection, gas control and liquid control, and has the main functions of: (1) the method comprises the following steps of (1) running drilling tools, casing pipes and the like, (2) controlling the bit pressure and handling accidents in the drilling process, and (3) taking the functions of running and releasing a derrick and a base of the drilling machine. Along with the requirements of the industrial technology and the petroleum equipment for updating and development, the drilling winch develops towards the direction of diversification of forms, large power and more advanced and reasonable performance. Classified according to the driving style, there are three main types of oil drilling winches: (1) the alternating current variable frequency electric driving winch adopts an advanced full-digital alternating current variable frequency technology and is driven by a broadband high-power motor, realizes the stepless speed regulation of the whole winch, is safe and efficient, and has the characteristics of small volume, light weight, small vibration, low noise, high efficiency and long service life, but in an energy consumption braking mode, the drilling speed of the winch is slow, and the alternating current variable frequency motor is expensive; (2) the direct current drive winch adopts an internal variable speed chain transmission mode, generally 4 gears are arranged, and the reverse gear is realized by the reverse rotation of a direct current motor. The lowering speed is greater than the given frequency speed of the frequency converter, the motor torque is changed into reverse braking torque, the control of the SCR is adopted, the power and rotating speed adjusting range is wide, the structure is simple, the maintenance is easy, compared with a mechanical winch, the size is small, the weight is light, but compared with an alternating-current variable-frequency electric driving winch, the size is large, and the weight is heavy. The chain transmission is adopted, so that the efficiency is low; (3) the mechanical driving winch takes a diesel engine as power, and drives the transmission form of the winch through a chain or an adhesive tape, so the mechanical driving winch is economical and efficient, has low production cost and easy maintenance, but has low efficiency, more transmission links, more complex structure, heavy weight and large volume; the three winches have the advantages and the disadvantages, wherein the alternating current variable frequency electric driving winch has the advantages of maintaining reasonable distribution of lifting working condition loads, fully utilizing power matching, being stable in speed regulation, being fully digital controlled and the like, and represents the development direction of automation and intellectualization of the current drilling machine.
However, in the actual oil field use process, the alternating current variable frequency winch is in the quick drilling process, and is influenced by a lowering mode and the like, the lowering speed of the winch is not fast higher than that of a direct current driven winch, in addition, the lowering process mainly depends on an alternating current variable frequency motor to perform energy braking, the energy in the lowering process cannot be rapidly released, the electric control system is greatly impacted, faults are easily caused, the rotational inertia of a gear train and a shaft system in a gearbox is overcome in the lowering process, and the winch work can also be influenced badly.
Disclosure of Invention
The invention aims to provide an efficient composite brake mode alternating-current variable-frequency winch, which is provided with three types of brakes and solves the problems that the brakes are braked only by the energy consumption of an alternating-current variable-frequency motor, the energy cannot be quickly released in the process of lowering, and a large impact is caused on an electric control system, so that faults are easily caused.
The invention also aims to provide a lowering control method of the high-efficiency composite braking mode alternating-current variable-frequency winch.
The technical scheme adopted by the invention is that the efficient composite brake mode alternating current variable frequency winch comprises an automatic drill feeding device, wherein the automatic drill feeding device is connected with a gearbox through a push disc clutch, the gearbox is connected with an alternating current variable frequency main motor through a first coupler, the gearbox is also connected with a roller shaft assembly through a clutch, the roller shaft assembly is connected with an electromagnetic eddy current brake through a second coupler or a roller shaft of the roller shaft assembly is connected with the electromagnetic eddy current brake through a key, and a hydraulic disc brake is connected between the electromagnetic eddy current brake and the roller shaft assembly through a key;
the present invention is also characterized in that,
the electric-hydraulic-control-type brake system is characterized by further comprising a PLC control system, wherein the PLC control system is respectively connected with a driller control room, a frequency converter and a roller encoder through an industrial bus, the PLC control system is further connected with a clutch through the industrial bus, the driller control room is connected with an electromagnetic eddy current brake and a hydraulic disc brake through the industrial control bus, the frequency converter is connected with an alternating-current frequency conversion main motor through a cable, and the roller encoder is connected with the roller shaft assembly.
The driller control room is provided with a normal drilling mode selection switch, a quick drilling mode selection switch and a safe drilling mode selection switch.
A lowering control method of an efficient composite braking mode alternating-current variable-frequency winch is implemented according to the following steps:
step 1, electrifying a driller control room, judging whether each part of the alternating-current variable-frequency winch in the efficient composite braking mode is normally connected and operated, entering the next step if the part is normal, stopping the whole process and returning to the inspection if the part is abnormal;
step 2, preparing for descending the winch, wherein the PLC control system collects parameters of the drum encoder in real time and judges the parameters through an internal program, so that the winch is controlled to be lifted or descended, and the winch is normally lifted or descended;
and 3, lowering the winch, manually selecting a drilling mode according to actual conditions, starting a switch corresponding to the drilling mode, feeding mode information back to the PLC control system after the mode of the driller control room is selected, and correspondingly controlling the PLC control system according to different modes.
In step 3, if the normal drilling mode selection switch is turned on, the normal drilling mode is entered, and in this mode: the PLC control system sends a signal to the electromagnetic eddy current brake to control the electromagnetic eddy current brake to be disconnected, and the hydraulic disc brake and the alternating current variable frequency main motor are in normal working states; when the winch needs to be stopped to be lowered, the driller control room sends an action signal to the PLC control system, and the PLC control system sends a control signal to the hydraulic disc brake and the frequency converter, so that combined braking with the hydraulic disc brake as a main part and the alternating-current frequency-conversion main motor as an auxiliary part is realized;
if the quick drilling mode selection switch is turned on, entering a quick drilling mode, wherein in the mode: the PLC control system sends a signal to disconnect the clutch, the clutch is disconnected, so that the gearbox and the alternating current variable frequency main motor are not connected with the roller shaft assembly any more, when the winch needs to be stopped to be lowered, the driller control room sends a control signal to the PLC control system, and the PLC control system sends the control signal to the hydraulic disc brake and the electromagnetic eddy current brake to start working, so that the combined braking of the hydraulic disc brake and the electromagnetic eddy current brake is realized;
if the safe drilling mode selection switch is turned on, entering a safe drilling mode, wherein in the safe drilling mode: the PLC control system gives out control signals, so that the hydraulic disc brake, the main motor energy consumption brake and the electromagnetic eddy current brake are all in a normal working state, when the winch needs to be stopped to be lowered, the driller control room sends out brake signals to the PLC control system, the PLC control system sends out control signals to the hydraulic disc brake and the electromagnetic eddy current brake to start working, meanwhile, the PLC control system sends out control signals to the frequency converter, so that the alternating-current frequency conversion main motor energy consumption brake starts working, and the common braking of the hydraulic disc brake, the electromagnetic eddy current brake and the alternating-current frequency conversion main motor energy consumption brake is realized.
The invention has the advantages that
1) Can realize boring down fast, be equipped with the clutch between winch gearbox and the drum shaft, the clutch declutches when boring down, and under the cooperation of electric brake, the winch speed of boring down is very fast, saves the time of boring down.
2) High efficiency, the winch plays to rise the operating mode and possesses the characteristics of exchanging frequency conversion drive: maintaining reasonable distribution of load under the lifting condition, and fully utilizing power matching; the drilling working condition has the characteristic of rapid drilling of the direct current drive winch, and the comprehensive efficiency is high.
3) The winch is provided with three sets of brake systems of a hydraulic disc brake, an alternating current variable frequency motor energy consumption brake and an electromagnetic eddy current brake, and the three sets of brake systems are matched with each other, so that the high safety of the winch can be realized.
4) The installation mode of the electromagnetic eddy current brake is diversified, and the connection mode of the electromagnetic eddy current brake and the drum shaft influences the connection size and the use efficiency of the winch, so that the winch is provided with ① electromagnetic eddy current brake and drum shaft which are connected through a coupler, and ② electromagnetic eddy current brake which is directly installed on the drum shaft.
Drawings
FIG. 1 is a schematic structural diagram of an efficient compound braking mode AC frequency conversion winch according to the present invention;
FIG. 2 is a diagram of an embodiment of an AC variable frequency winch with a high efficiency compound braking mode according to the present invention;
FIG. 3 is a flow chart of a lowering control method of the AC frequency conversion winch with the efficient compound brake mode according to the invention.
In the figure, 1, an alternating current frequency conversion main motor, 2, a gearbox, 3, a second coupling, 4, a roller shaft assembly, 5, a roller encoder, 6, a push plate clutch, 7, an automatic drill feeding device, 8, a PLC control system, 9, a driller control room, 10, a clutch, 11, a hydraulic disc brake, 12, an electromagnetic eddy current brake, 13, a frequency converter and 14, a first coupling.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a high-efficiency composite brake mode alternating current variable frequency winch, which comprises an automatic drill feeding device 7, wherein the automatic drill feeding device 7 is connected with a gearbox 2 through a push disc clutch 6, the gearbox 2 is connected with an alternating current variable frequency main motor 1 through a first coupler 14, the gearbox 2 is also connected with a roller shaft assembly 4 through a clutch 10, the roller shaft assembly 4 is connected with an electromagnetic eddy current brake 12 through a second coupler 3 or the roller shaft of the roller shaft assembly 4 is connected with the electromagnetic eddy current brake 12 through a key, and a hydraulic disc type brake 11 is connected between the electromagnetic eddy current brake 12 and the roller shaft assembly 4 through a key;
still including PLC control system 8, PLC control system 8 is connected with driller control room 9, converter 13 and drum encoder 5 respectively through industrial bus, and PLC control system 8 still passes through industrial bus connection clutch 10, and driller control room 9 passes through industrial control bus and is connected with electromagnetic eddy current brake 12 and hydraulic disc brake 11, and converter 13 exchanges frequency conversion main motor 1 through cable junction, and drum encoder 5 is connected with drum shaft assembly 4.
The driller control room 9 is provided with a normal drilling, quick drilling and safe drilling mode selection switch.
According to the efficient composite brake mode alternating-current variable-frequency winch disclosed by the invention, when the efficient composite brake mode alternating-current variable-frequency winch works, the alternating-current variable-frequency main motor 1 works to drive the gearbox 2, the gearbox 2 drives the automatic drill feeding device 7 and the roller shaft assembly 4, the roller shaft assembly 4 brakes the roller shaft assembly 4 by controlling the alternating-current variable-frequency main motor 1, the electromagnetic eddy current brake 12 and the hydraulic disc brake 11, and the roller shaft assembly 4 is decelerated and stopped to rotate.
As shown in fig. 3, the lowering control method of the high-efficiency composite braking mode alternating-current variable-frequency winch specifically comprises the following steps:
step 1, electrifying a driller control room 9, judging whether each part of the alternating-current variable-frequency winch in the high-efficiency composite braking mode is normally connected and operated, entering the next step if the part is normal, stopping the whole process and returning to the inspection if the part is abnormal;
step 2, preparing for descending the winch, and acquiring parameters of the drum encoder 5 in real time by the PLC control system 8 and judging the parameters through an internal program so as to control the ascending or descending of the winch and realize the normal ascending or descending of the winch;
and 3, lowering the winch, manually selecting a drilling mode according to actual conditions, starting a switch corresponding to the drilling mode, feeding mode information back to the PLC control system 8 after the mode of the driller control room 9 is selected, and correspondingly controlling the PLC control system 8 according to different modes.
In step 3, if the normal drilling mode selection switch is turned on, the normal drilling mode is entered, and in this mode: the PLC control system 8 sends a signal to the electromagnetic eddy current brake 12 to control the electromagnetic eddy current brake 12 to be switched off, the hydraulic disc brake 11 and the alternating current variable frequency main motor 1 are in a normal working state for dynamic braking, when the winch needs to be stopped to be lowered, the driller control room 9 sends an action signal to the PLC control system 8, the PLC control system 8 sends a control signal to the hydraulic disc brake 12 and the frequency converter 13, and combined braking with the hydraulic disc brake 12 as a main part and the alternating current variable frequency main motor 1 as an auxiliary part is realized;
if the quick drilling mode selection switch is turned on, entering a quick drilling mode, wherein in the mode: the PLC control system 8 sends a signal to disconnect the clutch 10, the clutch 10 is disconnected, so that the gearbox 2 and the alternating current variable frequency main motor 1 are not connected with the roller shaft assembly 4 any more, when the winch needs to be stopped to be lowered, the driller control room 9 sends a control signal to the PLC control system 8, the PLC control system 8 sends a control signal to the hydraulic disc brake 11 and the electromagnetic eddy current brake 12 to start working, and the combined braking of the hydraulic disc brake 11 and the electromagnetic eddy current brake 12 is realized; the winch can be quickly lowered at a speed higher than that of normal drilling, so that the requirement of the working condition of quick drilling is met;
if the safe drilling mode selection switch is turned on, entering a safe drilling mode, wherein in the safe drilling mode: the PLC control system 8 gives out a control signal to enable the hydraulic disc brake 12, the alternating current frequency conversion main motor 1 to perform dynamic braking and the electromagnetic eddy current brake 12 to be in a normal working state, when the winch needs to be stopped to be lowered, the driller control room 9 sends out a braking signal to the PLC control system 8, the PLC control system 8 sends out a control signal to the hydraulic disc brake 11 and the electromagnetic eddy current brake 12 to start working, meanwhile, the PLC control system 8 sends out a control signal to the frequency converter 13 to enable the alternating current frequency conversion main motor 1 to perform dynamic braking to start working, and therefore the hydraulic disc brake 11, the electromagnetic eddy current brake 12 and the alternating current frequency conversion main motor 1 to perform dynamic braking together; the safe drilling mode is mutually matched due to the fact that 3 sets of mutually independent brake systems are applied, safety redundancy is high, and therefore safety factor is high, and the safe drilling mode is particularly suitable for the working condition of heavy-load lowering.