Multifunctional frequency conversion electric rope-reversing machine for petroleum drilling rig

Abstract

This invention pertains to the field of oil drilling rigs, specifically a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs. It addresses the problems of existing rope rewinding machines where brakes are either ineffective or too rapid in stopping rotation, resulting in brakes that are either too soft or too hard. These issues lead to poor rope winding because the rewinding machine cannot keep pace with the drilling winch during large rope changes, resulting in insufficient tension when the wire rope winds onto the winch drum. The proposed solution includes a frame, a variable frequency power system, a variable frequency control system, a gear assembly, a rope rewinding assembly, a rope drum assembly, and a disc brake assembly. In this invention, the driving rope rewinding wheel enables the winding and releasing of the drilling wire rope. By rationally setting the braking time and logic of "energy-consuming braking" and "electromagnetic braking," "flexible braking" is achieved. The variable frequency control system ensures that the rewinding machine maintains continuous tension when the wire rope winds onto the drilling winch drum during large rope changes, ensuring good rope winding on the drilling winch.

Description

Technical Field

[0001] This invention relates to the field of oil drilling rig technology, and in particular to a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs. Background Technology

[0002] In oil and gas drilling operations, wire rope rewinding machines are mainly used for winding and unwinding drilling wire ropes and for threading drilling wire ropes. Based on power source, they can be divided into pneumatic, hydraulic, and electric wire rope rewinding machines. Existing wire rope rewinding machines have the following drawbacks: 1. The brakes of the wire rope rewinding machines are mechanical friction brakes, which suffer from problems of being either "too soft" (insufficient braking force, slow braking) or "too hard" (too fast braking, rapid locking). When the wire rope rewinding machine drives the rope wheel, which is fully wound with wire rope, to rotate, its rotational inertia is large. If the brake is "too soft," the rope wheel may not stop in time, easily causing a safety accident; if the brake is "too hard," the rope wheel stops abruptly, resulting in a large mechanical impact that can easily damage the equipment.

[0003] The electric rope rewinding machine disclosed in authorization announcement number CN 208532078 U uses an electromagnetic brake motor. The braking is "too hard". When the rope rewinding machine stops, the electromagnetic brake in the motor brakes directly and locks up quickly. Under the huge rotational inertia of the rope wheel, the impact is huge, which can easily cause damage to the intermediate gears, motors, shafts and other equipment.

[0004] The mechanical braking device for an electric rope rewinding machine disclosed in authorization announcement number CN 205064632 U uses a manual brake, where the brake block rubs against the drum under the action of the handle and connecting rod. However, this braking device still has the following defects in use:

[0005] 1. In reality, due to the huge inertia of the drum, this type of brake cannot stop the rotating rope pulley in a timely and effective manner, and the brake is "too soft".

[0006] 2. In the "changing the large rope" and "rewinding the large rope" operations, the drilling wire rope on the rope rewinding machine pulley needs to be released. After the wire rope passes through the traveling hoist system, it is fixed on the drum of the drilling winch. Then the drilling winch "actively winds the rope" and the rope rewinding machine "passively releases the rope". Since the rope rewinding machine cannot follow the drilling winch and maintain a continuous and constant tension, the wire rope is sometimes loose and sometimes tight. This makes it impossible to effectively wind the wire rope tightly when it is wound onto the winch drum. As a result, when the drilling winch winds multiple layers of rope during operation, the lower layer of wire rope is not wound tightly and the rope becomes tangled.

[0007] 3. When the rope rewinding machine is working to rewind or pull the drilling rope through the traveling crane system, it may tip over due to excessive dragging, posing a safety hazard. Summary of the Invention

[0008] The purpose of this invention is to solve the shortcomings of existing technologies, such as the inability of the brake to stop the rotation of the rope pulley in a timely and effective manner, the "soft" brake, and the risk of tipping over due to excessive drag when the rope rewinding machine is working to rewind or pull the drilling rope through the traveling hoist system. Therefore, this invention proposes a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A multi-functional variable frequency electric rope rewinding machine for oil drilling rigs includes a frame, a variable frequency power system, a variable frequency control system, a gear assembly, a rope pulley assembly, a rope winding drum assembly, and a disc brake assembly. The variable frequency power system includes an explosion-proof variable frequency brake motor and a reducer. The explosion-proof variable frequency brake motor has an electromagnetic power-off brake and a cooling fan at its tail, mounted on the input side of the reducer, and then the entire assembly is fixed to the frame via the reducer. The variable frequency control system includes an explosion-proof control box, a frequency converter, a heater, a gear selection switch, an emergency stop switch, a constant torque setting instrument, a control circuit, a radiator, an explosion-proof braking resistor, and an explosion-proof inclinometer. The gear selection switch switches between "normal" and "rope rewinding" control modes. Rope rewinding includes two working conditions: rewinding the rope or changing the rope. The radiator is attached to the rear of the explosion-proof control box. The explosion-proof inclinometer is mounted on the frame. All other components are encapsulated within the explosion-proof control box. The variable frequency control system is electrically connected to the variable frequency power system. The variable frequency control system drives the variable frequency power system, which in turn drives the rope pulley assembly or the rope drum assembly to rotate via the gear assembly. The gear assembly includes a pinion, a large gear, a shift fork, a main shaft, bearing housing one, and bearing housing two. The pinion is mounted on the output shaft of the reducer, the shift fork is mounted on the slotted hole of the large gear, the large gear is connected and fixed to the main shaft, and then fixed to the frame via bearing housing one and bearing housing two. The rope pulley assembly includes a rope pulley, a rope pulley shaft, and bushings. The rope pulley is fixed to the rope pulley shaft via bushings on both sides. One side of the rope pulley shaft is mounted on the frame, and the other side is mounted on the gear assembly. The variable frequency power system drives the rope pulley to rotate through the gear assembly and the shift fork. The rope winding drum assembly includes a rope winding gear, a sliding nut, bearing housing three, a rope winding drum, a screw, bearing housing four, and a handwheel. The rope winding drum is fixed to the frame via bearing housing three and bearing housing four. By rotating the handwheel, the screw and sliding nut are rotated, causing the rope winding gear to move axially and engage or disengage with the large gear. The disc brake assembly includes a brake handle, brake caliper, brake disc, booster pump, and hydraulic lines. The brake disc is mounted on the main shaft, and the other components are fixed on the winch frame. The booster pump is driven by the brake handle to supply oil to the brake caliper, thereby driving the brake caliper to brake the main shaft.

[0011] This invention enables the winding and unwinding of the drilling rope via a drive pulley, and allows the drilling rope to be pulled between the overhead crane and traveling block via a drive rope drum, serving a dual purpose. When winding or unwinding the drilling rope is required, the rope drum is disengaged, and the position of the fork on the large gear is adjusted in the slot, so that the fork engages in the hole or groove on the rope pulley. Then, by controlling the frequency converter, drive motor, reducer, pinion, large gear, and fork through the control system, the rope pulley can be rotated to achieve the winding and unwinding of the drilling rope. When it is necessary to "thread the main rope", the shift fork is retracted, causing it to disengage from the rope pulley. By turning the handwheel of the rope drum assembly, the screw and sliding nut are rotated, causing the rope guide gear to move axially and mesh with the large gear. In this way, by controlling the frequency converter, drive motor, reducer, pinion, large gear and rope guide gear through the frequency conversion control system, the rope guide drum can be rotated, winding the wire rope to pull the drilling main rope between the overhead crane and traveling block, thus achieving the purpose of threading the main rope.

[0012] Preferably, this invention employs an explosion-proof variable frequency brake motor, which achieves stepless speed regulation under the drive of the frequency converter in the control system. Simultaneously, the combination of the frequency converter and the variable frequency brake motor enables "energy-consumption braking" for deceleration and stopping. "Energy-consumption braking" means that when the rope rewinding machine stops, the variable frequency brake motor automatically switches from "motor" mode to "generator" mode, outputting torque in the reverse direction to convert the mechanical energy of the rotating rope wheel into heat, which is then dissipated into the environment through the braking resistor, achieving the purpose of flexible braking. The frequency converter allows for the reasonable setting of the energy-consumption braking time and the electromagnetic brake's engagement time, avoiding braking that is either too soft or too hard. After the rope rewinding machine stops through the "flexible" deceleration of the energy-consuming braking system, the brake installed on the back of the explosion-proof variable frequency brake motor engages in a timely manner, reliably stopping the rope rewinding machine mechanically. In case of emergency or when necessary, pressing the emergency stop switch can quickly engage the brake to stop the rope rewinding machine, ensuring safety. The variable frequency control system ensures that the rope rewinding machine maintains continuous tension when following the drilling winch to wind the wire rope onto the drilling winch drum in both the rewinding and changing of the large rope conditions, ensuring good rope winding of the drilling winch.

[0013] Preferably, the rope rewinding machine control system is set with two control modes: "normal" and "rewinding the large rope". In the "normal" mode, the rope rewinding machine can be controlled to rewind, enlarge, or pull the large rope. In the "rewinding the large rope" mode, the rope rewinding machine control system (frequency converter) enters the "speed following" and "constant torque output" modes. When the drilling winch is actively winding the rope, the rope rewinding machine is passively releasing the rope. The speed at which the rope rewinding machine releases the rope automatically follows the speed at which the drilling winch winds the rope, avoiding being too fast or too slow. At this time, the rope rewinding machine outputs a continuous and constant torque under the combined action of the drilling winch's drag and its own frequency converter, ensuring that the drilling wire rope is always in a suitable pre-tension state throughout the entire "winding" process (according to the wire rope usage specifications, the pre-tension force when winding the wire rope should be 2% of the maximum breaking tensile force of the wire rope. Under this condition, the output torque of the frequency converter can be set in advance through a constant torque setting instrument). This ensures that the drilling main rope is well wound onto the drilling winch drum, avoiding rope tangling caused by the initial loose winding during the later use of the drilling winch.

[0014] Preferably, the explosion-proof inclinometer is installed on the frame of the rope-turning machine and electrically connected to the control circuit of the frequency converter control system. When the rope-turning machine tilts and exceeds the safe angle under the action of external forces such as the drilling rig main rope and traction rope, the explosion-proof inclinometer will immediately output an electrical signal to the control system. The control system will then control the frequency converter and motor of the rope-turning machine to stop in time to prevent the occurrence of a tipping safety accident.

[0015] Preferably, a brake disc and disc brake assembly are provided on the main shaft of the gear assembly. In special circumstances where "energy-consuming braking", electromagnetic brake or intermediate transmission components fail, emergency braking can be achieved to stop the rope pulley in time and ensure safety.

[0016] Beneficial effects: This invention can achieve the purpose of winding and unwinding the drilling rope by driving the rope wheel, and can pull the drilling rope between the overhead crane and the traveling block by driving the rope drum. It is a dual-purpose machine with high efficiency.

[0017] This invention employs frequency conversion control technology to achieve "flexible braking" by rationally setting the braking time and logic of "energy-consuming braking" and "electromagnetic brake," thus avoiding braking that is either too soft or too hard.

[0018] This invention switches to the "reverse rope" mode, and the frequency conversion control system (frequency converter) enters the "speed following" and "constant torque output" modes, so that the drilling wire rope is always in a suitable pre-tension state throughout the entire "winding" process, ensuring that the drilling wire rope is well wound onto the drilling winch drum, and avoiding the rope tangling phenomenon caused by the initial loose winding during the later use of the drilling winch.

[0019] This invention, by incorporating an explosion-proof inclinometer, enables the rope-turning machine to stop promptly when it tilts under external force, thus preventing tipping accidents. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs proposed in this invention;

[0021] Figure 2 This is a top view schematic diagram of a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs proposed in this invention;

[0022] Figure 3 This is a side view of the structure of a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs proposed in this invention.

[0023] Figure 4 This is a schematic diagram of the main structure of the main component of a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs proposed in this invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the rope-drawing drum assembly in a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs proposed in this invention.

[0025] Figure 6 This is a three-dimensional structural diagram of the electrical control system in a multi-functional variable frequency electric rope rewinding machine for oil drilling rigs proposed in this invention;

[0026] Figure 7 This is a schematic diagram of the working state of a multi-functional variable frequency electric rope-changing machine for oil drilling rigs proposed in this invention, showing the operation of changing the large rope.

[0027] In the diagram: 1. Frame; 2. Power system; 201. Explosion-proof variable frequency brake motor; 202. Reducer; 203. Brake; 204. Cooling fan; 3. Variable frequency control system; 301. Explosion-proof control box; 302. Variable frequency drive; 303. Heater; 304. Gear selection switch; 305. Emergency stop switch; 306. Constant torque setting instrument; 307. Control circuit; 308. Radiator; 309. Explosion-proof braking resistor; 310. Explosion-proof inclinometer; 4. Gear assembly; 401. Pinion; 402. Large gear 403. Shift fork; 404. Bearing housing one; 405. Main shaft; 406. Bearing housing two; 5. Rope pulley assembly; 501. Rope pulley; 502. Rope pulley shaft; 503. Bushing; 6. Rope winding drum assembly; 601. Rope winding gear; 602. Sliding nut; 603. Bearing housing three; 604. Rope winding drum; 605. Screw; 606. Bearing housing four; 607. Handwheel; 7. Disc brake assembly; 701. Brake handle; 702. Brake caliper; 703. Brake disc; 704. Power pump; 705. Hydraulic pipeline. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1; Refer to Figure 1-7 A multi-functional variable frequency electric rope rewinding machine for oil drilling rigs includes a frame 1, a variable frequency power system 2, a variable frequency control system 3, a gear assembly 4, a rope pulley assembly 5, a rope winding drum assembly 6, and a disc brake assembly 7. The variable frequency power system 2 includes an explosion-proof variable frequency brake motor 201 and a reducer 202. The explosion-proof variable frequency brake motor 201 is equipped with an electromagnetic power-off brake 203 and a cooling fan 204 at its tail, installed on the input side of the reducer 202, and then the entire assembly is fixed to the frame 1 via the reducer 202. The variable frequency control system 3 includes an explosion-proof control box 301, a frequency converter 302, a heater 303, a gear selection switch 304, an emergency stop switch 305, a constant torque setting instrument 306, a control circuit 307, a radiator 308, an explosion-proof braking resistor 309, and an explosion-proof inclinometer 310. The radiator 308 is located close to the rear of the explosion-proof control box 301. The position selection switch 304 is used to switch between two control modes: "normal" and "reversing the main rope". Reversing the main rope includes two working conditions: reversing the main rope or changing the main rope. The explosion-proof inclinometer 310 is installed on the frame 1. All other components are encapsulated in the explosion-proof control box 301. The frequency conversion control system 3 is electrically connected to the frequency conversion power system 2. The frequency conversion control system 3 drives the frequency conversion power system 2, which drives the rope pulley assembly 5 or the rope drum assembly 6 to rotate through the gear assembly assembly 4. The frequency conversion control system 3 ensures that the reversing machine follows the drilling winch in the reversing or changing the main rope working conditions, so that the wire rope is continuously tensioned when it is wound onto the drilling winch drum, ensuring good rope winding of the drilling winch.

[0030] The gear assembly 4 includes a pinion 401, a large gear 402, a shift fork 403, a first bearing housing 404, a main shaft 405, and a second bearing housing 406. The pinion 401 is mounted on the output shaft of the reducer 202, and the shift fork 403 is mounted on the slotted hole of the large gear 402. The large gear 402 is connected and fixed to the main shaft 405, and then fixed to the frame 1 through the first bearing housing 404 and the second bearing housing 406. The pulley assembly 5 includes a pulley 501, a pulley shaft 502, and bushings 503. The pulley 501 is fixed to the pulley shaft through the bushings 503 on both sides. On 502, the rope pulley shaft 502 is mounted on one side of the frame 1 and on the other side of the gear assembly 4; the rope drum assembly 6 includes a rope gear 601, a sliding nut 602, a bearing seat 3 603, a rope drum 604, a screw 605, a bearing seat 4 606, and a handwheel 607. The rope drum 604 is fixed to the frame 1 by the bearing seats 3 603 and 4 606. By rotating the handwheel 607, the screw 605 and the sliding nut 602 are rotated, causing the rope gear 601 to move axially and engage or disengage with the large gear 402. The disc brake assembly 7 includes a brake handle 701, a brake caliper 702, a brake disc 703, a booster pump 704, and a hydraulic line 705. The brake disc 703 is mounted on the main shaft 405, and the remaining components are fixed to the frame 1.

[0031] This invention enables the winding and unwinding of the drilling rope via the drive rope pulley assembly 5, and allows the drilling rope to be pulled between the overhead crane and traveling block via the drive rope drum assembly 6, serving a dual purpose. When winding or unwinding the drilling rope is required, the rope drum assembly 6 is disengaged, and the position of the fork 403 on the large gear 402 is adjusted so that the fork 403 is engaged in the hole or groove on the rope pulley 501. In this way, the frequency converter 3 controls the frequency converter 302, drive motor, reducer 202, pinion 401, large gear 402, and fork 403, thereby driving the rope pulley assembly 5 to rotate and achieve the purpose of winding or unwinding the drilling rope. When it is necessary to "thread the main rope", the shift fork 403 is retracted, so that the shift fork 403 is disengaged from the rope pulley 501. By rotating the handwheel 607 of the rope drum assembly 6, the screw 605 and the sliding nut 602 are driven to rotate, so that the rope guide gear 601 moves axially and meshes with the large gear 402. In this way, by controlling the frequency converter 302, drive motor, reducer 202, pinion 401, large gear 402 and rope guide gear 601 through the frequency conversion control system 3, the rope guide drum 604 can be driven to rotate, and the main drilling rope is wound around the wire rope to pull the main drilling rope through the overhead crane and traveling block, so as to achieve the purpose of threading the main rope.

[0032] This invention employs an explosion-proof variable frequency brake motor 201, which achieves stepless speed regulation under the drive of the frequency converter 302 in the variable frequency control system 3. Simultaneously, the combination of the frequency converter 302 and the explosion-proof variable frequency brake motor 201 enables "energy-consumption braking" for deceleration and stopping. "Energy-consumption braking" means that when the rope rewinding machine stops, the explosion-proof variable frequency brake motor 201 automatically switches from "motor" mode to "generator" mode, outputting torque in the reverse direction. This converts the mechanical energy of the rotating rope wheel shaft 502 into heat, which is dissipated into the environment through the explosion-proof braking resistor 309, achieving the purpose of flexible braking. The frequency converter 302 allows for reasonable setting of the energy-consumption braking time and the braking action time of the electromagnetic brake 203, avoiding "too soft" or "too hard" braking. After the rope rewinding machine stops through "flexible" deceleration using energy-consumption braking, the brake 203 installed on the rear side of the explosion-proof variable frequency brake motor 201 engages in a timely manner, reliably stopping the rope rewinding machine mechanically. In case of emergency or when necessary, pressing the emergency stop switch 305 can quickly engage the brake to stop the rope rewinding machine, ensuring safety.

[0033] The frequency converter control system 3 of the rope rewinding machine is set with two control modes. In the "normal" mode, the rope rewinding machine can be controlled to take in, enlarge, or pull the large rope. In the "rewinding large rope" mode, the frequency converter 302 of the rope rewinding machine control system enters the "speed following" and "constant torque output" modes. When the drilling winch is actively winding the rope, the rope rewinding machine is passively releasing the rope. The speed at which the rope rewinding machine releases the rope automatically follows the speed at which the drilling winch winds the rope, avoiding being too fast or too slow. At this time, the rope rewinding machine outputs a continuous and constant torque under the combined action of the drilling winch's drag and its own frequency converter 302. This ensures that the drilling wire rope is always in a suitable pre-tension state throughout the entire winding process (according to the wire rope usage specifications, the pre-tension force during wire rope winding should be 2% of the wire rope's maximum breaking tensile strength. Under this condition, the output torque of the frequency converter 302 can be set in advance through the constant torque setting instrument 306). This ensures that the drilling main rope is well wound onto the drilling winch drum, avoiding rope tangling caused by the initial loose winding during later use of the drilling winch.

[0034] The explosion-proof inclinometer 310 is installed on the frame of the rope-turning machine and is electrically connected to the control circuit 307 of the frequency conversion control system 3. When the rope-turning machine tilts and exceeds the safe angle under the action of external forces such as the drilling rig main rope and traction rope, the explosion-proof inclinometer 310 will immediately output an electrical signal to the frequency conversion control system 3. The frequency conversion control system 3 controls the frequency converter 302 and motor of the rope-turning machine to stop in time to prevent the occurrence of a tipping safety accident.

[0035] A brake disc 703 and a disc brake assembly 7 are installed on the main shaft 405 of the gear assembly 4. In special circumstances where "energy-consuming braking", electromagnetic brake 203 or intermediate transmission components fail, emergency braking can be achieved to stop the rope wheel 501 in time and ensure safety.

[0036] The explosion-proof control box 301 of the frequency converter control system 3 is equipped with a heater 303 and a radiator 308, which can heat and dissipate heat as needed, so that the frequency converter 302 is kept within a suitable temperature range, ensuring the smooth operation of the machine.

[0037] However, as is well known to those skilled in the art, the working principles and wiring methods of heater 303, radiator 308, frequency converter 302, gear selector switch 304, emergency stop switch 305, constant torque setting instrument 306, and control circuit 307 are commonplace and belong to conventional means or common knowledge. They will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-functional variable frequency electric rope rewinding machine for oil drilling rigs, comprising a frame (1), a variable frequency power system (2), a variable frequency control system (3), a gear assembly (4), a rope pulley assembly (5), a rope winding drum assembly (6), and a disc brake assembly (7), characterized in that, The variable frequency power system (2) includes an explosion-proof variable frequency brake motor (201) and a reducer (202). The explosion-proof variable frequency brake motor (201) is equipped with an electromagnetic power failure brake (203) and a cooling fan (204) at its tail end, and is installed on the input side of the reducer (202). The whole system is fixed on the frame (1) by the reducer (202). The frequency conversion control system (3) includes an explosion-proof control box (301), a frequency converter (302), a heater (303), a gear selection switch (304), an emergency stop switch (305), a constant torque setting device (306), a control circuit (307), a radiator (308), an explosion-proof braking resistor (309), and an explosion-proof inclinometer (310). The radiator (308) is attached to the rear of the explosion-proof control box (301). The explosion-proof inclinometer (310) is mounted on the frame (1). The frequency converter (302), heater (303), gear selection switch (304), and other components are also included. 304), emergency stop switch (305), constant torque setting instrument (306), control circuit (307), and explosion-proof braking resistor (309) are encapsulated in explosion-proof control box (301). The frequency conversion control system (3) is electrically connected to the frequency conversion power system (2) and is used to drive the frequency conversion power system (2). Through the gear assembly assembly (4), the rope wheel assembly (5) and the rope drum assembly (6) are driven to rotate. Through the frequency conversion control system (3), the rope rewinding machine follows the drilling winch so that the wire rope is continuously tensioned when it is wound on the drilling winch drum, ensuring good rope winding of the drilling winch. The gear assembly (4) includes a pinion (401), a gear (402), a shift fork (403), a bearing housing one (404), a main shaft (405), and a bearing housing two (406). The pinion (401) is mounted on the output shaft of the reducer (202), the shift fork (403) is mounted on the slot of the gear (402), the gear (402) is connected and fixed to the main shaft (405), and is fixed to the frame (1) by the bearing housing one (404) and the bearing housing two (406).

2. The multi-functional variable frequency electric rope rewinding machine for oil drilling rigs according to claim 1, characterized in that, The sheave assembly (5) includes a sheave (501), a sheave shaft (502), and a bushing (503). The sheave (501) is fixed to the sheave shaft (502) by the bushings (503) on both sides. One end of the sheave shaft (502) is mounted on the frame (1), and the other end is mounted on the gear assembly (4).

3. The multi-functional variable frequency electric rope rewinding machine for oil drilling rigs according to claim 1, characterized in that, The rope-leading drum assembly (6) includes a rope-leading gear (601), a sliding nut (602), a bearing seat three (603), a rope-leading drum (604), a screw (605), a bearing seat four (606), and a handwheel (607). The rope-leading drum (604) is fixed to the frame (1) by the bearing seat three (603) and the bearing seat four (606). The sliding nut (602) slides through one end of the rope-leading drum (604). The rope-leading gear (601) is fixedly sleeved on the screw. The outer wall of the sliding nut (602) is connected to the screw (605), which rotates through the rope drum (604) and extends threadedly into the interior of the sliding nut (602). The handwheel (607) is fixedly connected to one end of the screw (605). The rope gear (601) is used in conjunction with the large gear (402). By rotating the handwheel (607), the screw (605) and the sliding nut (602) are driven to rotate, so that the rope gear (601) moves axially and engages or disengages with the large gear (402).

4. The multi-functional variable frequency electric rope rewinding machine for oil drilling rigs according to claim 1, characterized in that, The disc brake assembly (7) includes a brake handle (701), a brake caliper (702), a brake disc (703), a booster pump (704), and a hydraulic line (705). The brake disc (703) is mounted on the spindle (405). The brake caliper (702), brake disc (703), booster pump (704), and hydraulic line (705) are all fixed on the frame (1). The booster pump (704) is driven by the brake handle (701) to supply oil to the brake caliper (702), thereby driving the brake caliper (702) to brake the spindle (405).

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