A hoist with single / double drum switching configuration and its usage method

Abstract

This application provides a hoist with a single / double drum switching mode and its usage method, comprising: a first single drum hoist, a second single drum hoist, and a rope adjusting clutch connected between the two; the rope adjusting clutch includes a bearing housing, an internal gear ring of a shaft seat rotatably connected to the inner ring of the bearing housing, and two fixed hubs, which are respectively connected to the main shafts of the first and second single drum hoists. Each fixed hub is connected to an external gear ring of rope adjusting that can slide along its axial direction. The external gear ring of rope adjusting is connected to a deflector ring, which is connected to a telescopic mechanism fixed on the single drum hoist; when the telescopic mechanism extends or retracts, the deflector ring drives the external gear ring of rope adjusting to engage or disengage with the internal gear ring of the shaft seat. This allows switching between two modes: independent operation of the two single drums and synchronous operation of the two drums.

Description

Technical Field

[0001] This application relates to the field of mining hoisting equipment technology, specifically to a hoist with a single / double cylinder switching configuration and its usage method. Background Technology

[0002] Shaft sinking hoists are specialized hoisting equipment used during the construction of mine shafts, primarily for lifting and lowering personnel, equipment, and slag. Because shaft sinking hoists employ a winding hoisting method, and each drum typically has only one winding area, a single drum can only lift one bucket (a bucket is a specialized load-bearing container used in shaft sinking operations).

[0003] Currently, conventional shaft sinking hoists are mainly divided into two structural forms: single-drum and double-drum. Single-drum hoists have a simple structure, but can only lift one bucket at a time, resulting in low muck removal efficiency and slow construction progress. They are generally only suitable for small mines with shallow shafts and small lifting capacities. Double-drum hoists include a fixed drum, a traveling drum, and a rope-adjusting clutch. The fixed drum is rigidly connected to the hoist's main shaft, while the traveling drum is loosely fitted onto the main shaft and connected to the fixed drum via the rope-adjusting clutch. Therefore, although double-drum hoists have two drums and can lift two buckets simultaneously, during hoisting operations, the position of the bucket on the fixed drum side can usually only be adjusted, and the position of the bucket on the traveling drum side cannot be independently and flexibly controlled.

[0004] During the vertical shaft construction phase, the shaft depth continuously changes, frequently requiring fine adjustments to the relative positions of the two buckets to match the ever-changing working conditions. However, because existing twin-drum hoists and their rope-adjusting clutches cannot achieve completely independent control of the two bucket positions, only one bucket is often used in vertical shaft construction. The twin-drum hoisting function can only play a limited role in the horizontal tunnel construction phase. This not only results in idle equipment capacity and wasted resources during the vertical shaft construction phase but also makes its overall hoisting efficiency still relatively low, failing to meet the higher requirements for hoisting efficiency in rapid deep vertical shaft construction. Summary of the Invention

[0005] To address the problems in the prior art, the first aspect of this application provides a hoist with a single / double drum switching configuration, comprising:

[0006] The first single-drum hoist, the second single-drum hoist, and the rope adjusting clutch connected between the two;

[0007] The rope adjusting clutch includes a bearing housing, an internal gear ring of a shaft housing rotatably connected to the inner ring of the bearing housing, and two fixed hubs; the two fixed hubs are respectively connected to the main shafts of the first single-drum hoist and the second single-drum hoist, and each fixed hub is connected to an external gear ring of rope adjusting that can slide along its axial direction, the external gear ring of rope adjusting is connected to a toggle ring, and the toggle ring is connected to a telescopic mechanism fixed on the single-drum hoist;

[0008] When the telescopic mechanism extends or retracts, the actuating ring drives the outer gear ring of the adjusting rope to engage or disengage with the inner gear ring of the shaft seat.

[0009] Furthermore, the bearing housing includes a detachable upper half and a lower half, the lower half being connected to the foundation by fasteners.

[0010] Furthermore, a sliding bearing is connected between the bearing housing and the inner gear ring of the bearing housing, and the mating surface between the inner gear ring of the bearing housing and the sliding bearing is a spherical surface, so that the inner gear ring of the bearing housing can rotate circumferentially around the inner ring of the bearing housing and swing axially in multiple directions relative to the bearing housing.

[0011] Furthermore, the inner ring of the adjusting rope outer gear ring is provided with involute spline teeth that cooperate with the fixed hub, and the outer ring has a stepped structure. The large diameter section of the stepped structure is provided with involute teeth that mesh with the inner gear ring of the bearing seat, and the small diameter section is provided with a first mounting groove for connecting the actuating ring.

[0012] Furthermore, the outer circle of the fixed hub is an involute external spline, and one end of its outer circle is provided with a positioning step, and the other end is provided with a second mounting groove, in which a detachable retaining ring is provided.

[0013] Furthermore, the actuating ring is rotatably connected in the first mounting groove of the outer toothed ring of the adjusting rope. The actuating ring consists of two half-rings, and its surface in contact with the outer toothed ring of the adjusting rope is inlaid with Babbitt alloy.

[0014] Furthermore, the telescopic mechanism includes a rope adjusting cylinder, a cylinder mounting base, and a limit switch. The rope adjusting cylinder is mounted on the bearing of the main shaft of the single-drum hoist via the cylinder mounting base, and the piston rod of the rope adjusting cylinder is connected to the actuating ring. The limit switch is used to limit the stroke of the piston rod of the rope adjusting cylinder and lock it after the piston rod reaches the preset stroke.

[0015] A second aspect of this application provides a method of using a hoist with a single / double drum switching configuration as described in any of the preceding claims, comprising:

[0016] The two external gear rings for adjusting ropes are disengaged from the internal gear ring of the shaft seat, so that the first and second single-drum elevators can operate independently.

[0017] When the bucket of the first single-drum hoist is at the bottom of the well and the bucket of the second single-drum hoist is at the top of the well, the two external gear rings of the rope adjustment are driven to mesh with the internal gear ring of the shaft seat, so that the main shafts of the two single-drum hoists are circumferentially fixedly connected, switching to the double-drum mode, and realizing that the two buckets move synchronously towards each other, one up and one down.

[0018] When the buckets of the two single-drum hoists are at the top or bottom of the well simultaneously, the two external gear rings of the rope adjustment mechanism mesh with the internal gear ring of the shaft seat, switching to the double-drum mode and realizing the synchronous operation of the two buckets.

[0019] Furthermore, when the well depth changes while the two buckets are running synchronously towards each other, switching to single-bucket mode and adjusting the first and second single-bucket hoists separately so that one bucket is at the bottom of the well and the other bucket is at the top, switching back to double-bucket mode to achieve synchronous operation of the two buckets.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] The hoist with single / double drum switching capability described in this application can connect or disconnect the main shafts of two single drum hoists via a rope-adjusting clutch, enabling switching between two modes: independent operation of the two single drums and synchronous operation of the two drums. This significantly improves the load capacity of the equipment, increases the hoisting efficiency during well drilling, and enhances equipment utilization.

[0022] The mating surface between the internal gear ring of the bearing housing and the sliding bearing in this application is spherical. This structure allows the internal gear ring of the bearing housing to self-adaptively swing within a certain range in the axial direction to accommodate misalignment or tilting of the main shafts of the first and second single-drum hoists, thus providing better compatibility. This reduces the difficulty of installation and commissioning and the maintenance cost. Attached Figure Description

[0023] Figure 1 This is an axial half-sectional view of the hoist with single-double cylinder switching configuration of this application;

[0024] Figure 2 for Figure 1 Axial half-sectional view of the adjusting rope clutch;

[0025] Figure 3 This is a radial sectional view of the rope-adjusting clutch of this application;

[0026] Figure 4 This is a schematic diagram of the external gear ring for adjusting the rope in this application;

[0027] Figure 5 This is a radial sectional view of the internal gear ring of the bearing housing in this application;

[0028] Figure 6 This is a radial sectional view of the fixed hub of this application;

[0029] Figure 7 and Figure 8 This is a partial schematic diagram of the single-cylinder type elevator of this application;

[0030] Figure 9 This is a partial schematic diagram of the twin-cylinder type elevator of this application;

[0031] In the diagram: 10. First single-drum hoist; 20. Rope adjusting clutch; 21. Bearing housing; 22. Actuating ring; 23. Rope adjusting external gear ring; 24. Fixed hub; 25. Retaining ring; 26. Shaft housing internal gear ring; 27. Sliding bearing; 28. Telescopic mechanism; 29. ​​Anchor bolt; 30. Second single-drum hoist. Detailed Implementation

[0032] To facilitate understanding of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Mine shaft construction mainly includes vertical shaft construction and horizontal tunnel construction. Vertical shaft construction refers to the construction of vertical shafts, while horizontal tunnel construction mainly refers to the construction of horizontal or near-horizontal tunnels. In vertical shaft construction, the shaft depth continuously increases as the project progresses. After each construction cycle, the relative positions of the two hoists located at the shaft opening and bottom must be precisely adjusted according to the new shaft depth to achieve efficient and accurate loading and unloading. This process requires the hoist to have the ability to independently and flexibly control the positions of the two hoists.

[0034] In existing technologies, twin-drum shaft sinking hoists typically include a fixed drum, a traveling drum, and a rope-adjusting clutch. The fixed drum is rigidly connected to the hoist's main shaft, while the traveling drum is loosely fitted onto the main shaft and connected to the fixed drum via the rope-adjusting clutch. Because the traveling drum itself lacks an independent drive mechanism, it can generally only adjust the position of the bucket on the fixed drum side, and cannot independently and flexibly control the position of the bucket on the traveling drum side. During vertical shaft construction, as the shaft depth changes, existing structures cannot achieve synchronous, opposite-direction movement of the two buckets (one at the bottom of the shaft and the other at the top) by separately adjusting the buckets on both sides of the fixed and traveling drums.

[0035] like Figures 1 to 2 As shown, this application provides a hoist with a single / double drum switching configuration, comprising:

[0036] A first single-drum hoist 10, a second single-drum hoist 30, and a rope-adjusting clutch 20 connected between the first single-drum hoist 10 and the second single-drum hoist 30.

[0037] Both the first single-drum hoist 10 and the second single-drum hoist 30 include a drive motor, a main shaft, a drum, a hoisting rope, and a bucket. The drive motor is connected to the main shaft, and the drum is circumferentially fixed to the main shaft via a key. One end of the hoisting rope is fixed and wound around the drum, while the other end passes over a sheave to suspend the bucket. The hoisting rope is wound or unwound using different drum rotation patterns, thus completing the lifting and lowering operations.

[0038] The rope adjusting clutch 20 includes a bearing housing 21, an internal gear ring 26 of the bearing housing 21 rotatably connected to the inner ring of the bearing housing 21, and two fixed hubs 24. The two fixed hubs 24 are respectively connected to the main shafts of the first single-drum hoist 10 and the second single-drum hoist 30. Each fixed hub 24 is connected to an external gear ring 23 of rope adjusting that can slide along its axial direction. The external gear ring 23 of rope adjusting is connected to a toggle ring 22, and the toggle ring 22 is connected to a telescopic mechanism 28 fixed on the single-drum hoist.

[0039] When the telescopic mechanism 28 extends or retracts, the actuating ring 22 drives the adjusting rope outer gear ring 23 to engage or disengage with the shaft seat inner gear ring 26. When both adjusting rope outer gear rings 23 are disengaged from the shaft seat inner gear ring 26, the first single-drum hoist 10 and the second single-drum hoist 30 can operate completely independently; when both adjusting rope outer gear rings 23 are engaged with the shaft seat inner gear ring 26, the main shafts of the first single-drum hoist 10 and the second single-drum hoist 30 are circumferentially fixedly connected, and the first single-drum hoist 10 and the second single-drum hoist 30 form a double-drum well drilling hoist.

[0040] The hoist with single / double drum switching capability of this application can connect or separate the main shafts of two single drum hoists via a rope-adjusting clutch 20, enabling switching between two modes: independent operation of the two single drums and synchronous operation of the two drums. This significantly improves the hoisting efficiency and equipment utilization rate during well drilling operations.

[0041] In some embodiments, such as Figure 3 As shown, the bearing housing 21 is a cast steel component, comprising a detachable upper half and a lower half, which are fixed together as a whole by fitting locating joints and connecting bolts. This structure facilitates installation, adjustment, and maintenance of the internal sliding bearing 27. The lower half of the bearing housing 21 is fixed to the base or foundation by anchor bolts 29. The anchor bolts 29 include bolts, nuts, washers, and base plates to achieve the function of fixing the bearing housing 21.

[0042] In the above embodiments, when the two external gear rings 23 of the adjusting ropes and the internal gear ring 26 of the shaft seat are engaged, the entire transmission system requires extremely high alignment accuracy. Specifically, it is essential to ensure that the center lines of the main shafts of the first single-drum elevator 10, the second single-drum elevator 30, and the internal gear ring 26 of the shaft seat are on the same horizontal axis. This results in high installation and commissioning difficulty, poor equipment fault tolerance, and high maintenance costs.

[0043] In some embodiments, such as Figure 5 As shown, a sliding bearing 27 is connected between the bearing housing 21 and the inner gear ring 26 of the bearing housing, and the mating surface between the inner gear ring 26 of the bearing housing and the sliding bearing 27 is a spherical surface, so that the inner gear ring 26 of the bearing housing can rotate circumferentially around the inner ring of the bearing housing 21 and swing axially in multiple directions relative to the bearing housing 21.

[0044] Specifically, the material of the sliding bearing 27 is Babbitt alloy. The outer ring of the sliding bearing 27 is embedded in the inner ring of the bearing housing 21. The inner ring of the sliding bearing 27 has a concave spherical surface, and the outer ring of the internal gear ring 26 of the bearing housing has a convex spherical surface that mates with the inner ring of the sliding bearing 27. The two are rotatably and oscillatingly connected by the spherical structure. Before use, grinding is performed to improve the surface finish of the spherical surfaces, and grease is applied evenly to reduce wear and resistance. This structure allows the internal gear ring 26 of the bearing housing to oscillate within a certain range in the axial direction to accommodate the misalignment or tilt of the main shafts of the first single-drum elevator 10 and the second single-drum elevator 30, thus providing better compatibility. This reduces the difficulty of installation and commissioning and the maintenance cost.

[0045] In some embodiments, such as Figure 4 As shown, the inner ring of the adjusting rope external gear ring 23 is provided with involute splines that mate with the fixed hub 24, thereby enabling reliable transmission of large torque in the circumferential direction. On the other hand, it allows the adjusting rope external gear ring 23 to slide precisely axially along the fixed hub 24 under the guidance of the spline pair, thus achieving engagement and disengagement with the bearing seat internal gear ring 26. The outer ring of the adjusting rope external gear ring 23 has a stepped structure. The outer circumference of the large-diameter section of the stepped structure is provided with involute teeth for meshing with the internal teeth of the bearing seat internal gear ring 26. A first annular mounting groove is formed on the small-diameter section. The actuating ring 22 is a ring structure composed of two half-rings, rotatably connected in the first mounting groove of the adjusting rope external gear ring 23. The surface of the actuating ring 22 in contact with the adjusting rope external gear ring 23 is inlaid with Babbitt alloy. This reduces frictional resistance and wear between the outer gear ring 23 and the stationary actuating ring 22 when the adjusting rope rotates at high speed, ensuring smooth operation; and effectively transmits the thrust of the telescopic mechanism 28 without rotating with the gear ring, ensuring the stability and reliability of the driving process.

[0046] In some embodiments, such as Figure 6As shown, the fixed hub 24 is mounted on the main shaft of the single-drum hoist via a key and an interference fit in the inner bore, and rotates with the main shaft. The outer circle of the fixed hub 24 is an involute external spline that mates with the inner circle of the rope-adjusting external gear ring 23, and one end of its outer circle has an integrally formed positioning step. The other end has an annular second mounting groove, in which a removable retaining ring 25 is provided to limit the movement of the rope-adjusting external gear ring 23. The retaining ring 25 is an annular structure composed of two semi-circular rings, and their mating surfaces are connected by positioning bolts.

[0047] In some embodiments, there are four telescopic mechanisms 28, which are respectively connected to the left and right sides of the first single-drum hoist 10 and the second single-drum hoist 30. The telescopic mechanism 28 includes a rope adjusting cylinder, a cylinder mounting base, and a limit switch. The rope adjusting cylinder is mounted on the bearing of the main shaft of the single-drum hoist via the cylinder mounting base, and the piston rod of the rope adjusting cylinder is connected to the actuating ring 22. The limit switch is used to limit the stroke of the piston rod of the rope adjusting cylinder and locks it after the piston rod reaches the preset stroke.

[0048] This application also provides a method of using a hoist with a single / double drum switching configuration, including:

[0049] The two external gear rings 23 of the drive rope are disengaged from the internal gear ring 26 of the shaft seat so that the first single-drum elevator 10 and the second single-drum elevator 30 can operate independently.

[0050] Specifically, such as Figures 7 to 8 As shown, in the early stages of shaft construction, the well depth is shallow and the load is small. The power of a single motor is sufficient to meet the hoisting requirements, so a single bucket hoisting mode can be used. When the piston rod of the rope adjusting cylinder retracts, the piston rod drives the actuating ring 22 to move the rope adjusting external gear ring 23 to both sides. After reaching the limit, it locks. At this time, the rope adjusting external gear rings 23 at both ends of the rope adjusting clutch 20 disengage from the inner gear ring 26 of the shaft seat, becoming two completely independent single hoists, realizing the completely independent operation of the two buckets.

[0051] When the bucket of the first single-drum hoist 10 is at the bottom of the well and the bucket of the second single-drum hoist 30 is at the wellhead, the two external gear rings 23 of the driving rope are driven to mesh with the internal gear ring 26 of the shaft seat, so that the main shaft of the first single-drum hoist 10 and the main shaft of the second single-drum hoist 30 are circumferentially fixedly connected. The first single-drum hoist 10 and the second single-drum hoist 30 form a double-drum well sinking hoist, realizing that the two buckets move synchronously in opposite directions, one up and one down.

[0052] Specifically, such as Figure 9As shown, in the later stages of shaft construction, when the shaft depth and load are large, the power of a single motor is insufficient to meet the lifting requirements. It is necessary to switch to a double-bucket lifting mode, adjusting the bucket of the first single-bucket hoist 10 to the bottom of the shaft and the bucket of the second single-bucket hoist 30 to the top. The piston rod of the rope adjusting cylinder extends, driving the actuating ring 22 to move the rope adjusting external gear ring 23 towards the center. After reaching the limit, it locks. At this time, both ends of the rope adjusting clutch 20's rope adjusting external gear ring 23 mesh with the shaft seat's internal gear ring 26, transforming it into a double-bucket shaft sinking hoist, enabling the two buckets to move synchronously in opposite directions, one above the other. The drive motors of the two single-bucket hoists simultaneously drive the main shaft to rotate, greatly improving the equipment's load capacity and lifting efficiency.

[0053] Furthermore, when the well depth changes, it is impossible to simultaneously have one bucket at the wellhead and the other at the bottom. The rope-adjusting cylinder drives the actuating ring 22 to move the rope-adjusting external gear ring 23 to both sides, causing both ends of the rope-adjusting clutch 20's external gear ring 23 to disengage from the shaft seat's internal gear ring 26, switching to a single-bucket configuration. The first single-bucket hoist 10 and the second single-bucket hoist 30 then become two completely independent operating devices. The positions of the two buckets can be adjusted separately and precisely, lowering one bucket to the bottom of the well and raising the other to the wellhead. This solves the construction requirement of needing to reposition the buckets due to changes in well depth and addresses the problem of the inability to completely independently control the relative positions of the two buckets in existing technologies. After the two buckets are adjusted to the target position, the rope adjusting cylinder drives the actuating ring 22 to move the rope adjusting outer gear ring 23 towards the middle, so that the rope adjusting outer gear ring 23 at both ends of the rope adjusting clutch 20 meshes with the inner gear ring 26 of the shaft seat, so that the main shaft of the first single-drum hoist 10 and the main shaft of the second single-drum hoist 30 are circumferentially fixedly connected, thereby switching back to the double-drum mode and realizing the synchronous opposite movement of the two buckets, one up and one down.

[0054] The method of use in this embodiment, by switching between single-tube and double-tube configurations, allows the hoisting operation to closely follow the dynamic changes in the well depth, maximizes the hoisting capacity of the double buckets, significantly shortens the non-hoisting time of each cycle, and thus greatly improves the overall efficiency of vertical shaft construction.

[0055] When the buckets of the first single-drum hoist 10 and the second single-drum hoist 30 are simultaneously at the wellhead or bottom, the two external gear rings 23 drive the rope adjusting mechanism to mesh with the internal gear rings 26 of the shaft seat. The first single-drum hoist 10 and the second single-drum hoist 30 form a double-drum well sinking hoist, achieving synchronous operation of the two buckets. The output torque of the drive motors of the first single-drum hoist 10 and the second single-drum hoist 30 acts on the hoisting system through the synchronized main shaft, thereby significantly improving the load capacity of a single hoisting operation.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A hoist with a single / double drum switching configuration, characterized in that, include: A first single-drum hoist (10), a second single-drum hoist (30), and a rope adjusting clutch (20) connected between the two. The rope adjusting clutch (20) includes a bearing seat (21), a shaft seat internal gear ring (26) rotatably connected to the inner ring of the bearing seat (21), and two fixed hubs (24); the two fixed hubs (24) are respectively connected to the main shafts of the first single-drum elevator (10) and the second single-drum elevator (30), and each fixed hub (24) is connected to a rope adjusting external gear ring (23) that can slide along its axial direction, and the rope adjusting external gear ring (23) is connected to a toggle ring (22), and the toggle ring (22) is connected to a telescopic mechanism (28) fixed on the single-drum elevator; When the telescopic mechanism (28) extends or retracts, the actuating ring (22) drives the outer gear ring (23) of the adjusting rope to engage or disengage with the inner gear ring (26) of the bearing seat; A sliding bearing (27) is connected between the bearing housing (21) and the inner gear ring (26) of the bearing housing, and the mating surface between the inner gear ring (26) of the bearing housing and the sliding bearing (27) is a spherical surface, so that the inner gear ring (26) of the bearing housing can rotate circumferentially around the inner ring of the bearing housing (21) and swing axially relative to the bearing housing (21). The inner ring of the adjusting rope outer gear ring (23) is provided with involute spline teeth that cooperate with the fixed hub (24), and the outer ring is a stepped structure. The large diameter section of the stepped structure is provided with involute teeth that mesh with the inner gear ring (26) of the shaft seat, and the small diameter section is provided with a first mounting groove for connecting the actuating ring (22). The outer circle of the fixed hub (24) is an involute external spline, and one end of its outer circle is provided with a positioning step, and the other end is provided with a second mounting groove, in which a detachable retaining ring (25) is provided. The actuating ring (22) is rotatably connected in the first mounting groove of the adjusting rope outer toothed ring (23). The actuating ring (22) consists of two half-rings, and its surface in contact with the adjusting rope outer toothed ring (23) is inlaid with Babbitt alloy.

2. The hoist with single / double cylinder switching configuration according to claim 1, characterized in that, The bearing housing (21) includes a detachable upper half and a lower half, the lower half being connected to the foundation by fasteners.

3. The hoist with single / double cylinder switching configuration according to claim 1, characterized in that, The telescopic mechanism (28) includes a rope adjusting cylinder, a cylinder mounting base, and a limit switch. The rope adjusting cylinder is mounted on the bearing of the main shaft of the single-drum hoist via the cylinder mounting base. The piston rod of the rope adjusting cylinder is connected to the actuating ring (22). The limit switch is used to limit the stroke of the piston rod of the rope adjusting cylinder and lock it after the piston rod reaches the preset stroke.

4. A method of using a hoist with a single / double drum switching configuration as described in any one of claims 1-3, characterized in that, include: Drive the two rope adjusting external gear rings (23) to disengage from the shaft seat internal gear ring (26) so that the first single-drum elevator (10) and the second single-drum elevator (30) can operate independently; When the bucket of the first single-drum hoist (10) is at the bottom of the well and the bucket of the second single-drum hoist (30) is at the top of the well, the two rope adjusting external gear rings (23) are driven to mesh with the shaft seat internal gear ring (26), so that the main shafts of the two single-drum hoists are fixedly connected in the circumferential direction, switching to the double-drum mode, and realizing the synchronous opposite movement of the two buckets, one up and one down. When the buckets of the two single-drum hoists are at the wellhead or bottom at the same time, the two external gear rings (23) of the rope adjustment mechanism are driven to mesh with the internal gear ring (26) of the shaft seat, switching to the double-drum mode and realizing the synchronous operation of the two buckets.

5. The method of using the hoist with single / double drum switching configuration according to claim 4, characterized in that, When the well depth changes, the two buckets are in a state of synchronous operation, moving up and down in opposite directions. When the well depth changes, the buckets are switched to a single-bucket mode and the first single-bucket hoist (10) and the second single-bucket hoist (30) are adjusted separately so that one bucket is at the bottom of the well and the other bucket is at the wellhead. The buckets are then switched back to a double-bucket mode to achieve synchronous operation, moving up and down in opposite directions.

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