Rope threading structure for lifting derrick of land drilling machine
By installing multi-stage reverse rope pulley blocks and balance supports on the derrick of the land drilling rig, the problems of complex structural stress and short wire rope life caused by excessive pulley wrap angle were solved, thus improving the safety and efficiency of derrick lifting.
Patent Information
- Application Number
- CN202520656768.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-09
AI Technical Summary
In existing land drilling rig hoisting structures, excessive pulley wrap angles lead to complex structural stress, short wire rope life, and low assembly/disassembly efficiency, resulting in insufficient safety and reliability, especially in harsh environments.
A new rope threading structure is adopted, which sets up a multi-stage reverse rope pulley group on the derrick, including a fourth reverse rope pulley, a first reverse rope pulley, a second reverse rope pulley and a third reverse rope pulley, and designs a multi-stage guide path to make the hoisting rope wrap angle less than 90°, and ensures a smooth hoisting process by distributing the load through the balance support.
It significantly reduces the stress on pulleys and derrick structures, improves safety and reliability, reduces damage to wire ropes, and enhances assembly and disassembly efficiency and adaptability to complex working conditions.
Smart Images
Figure CN223866264U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of onshore oil and gas drilling and production equipment technology, specifically a rope-threading structure for lifting the derrick of an onshore drilling rig. Background Technology
[0002] Currently, the common method for hoisting derricks on land drilling rigs involves winding the main hoisting rope around the hoisting pulleys on both sides of the derrick at a 180° angle, and then guiding it from the outside of the derrick into the interior. Because derrick hoisting is a high-risk operation, the main hoisting rope experiences significant stress. The 180° wrap angle of the main hoisting rope on the hoisting pulleys generates double the hoisting force on the derrick structure. Furthermore, drilling operations are often conducted in harsh outdoor environments, especially in windy areas, placing even higher demands on the safety and reliability of the derrick structure during hoisting.
[0003] Because land drilling rigs are lifted frequently, the larger the wrap angle between the lifting rope and the reversing pulley, the greater the damage to the wire rope and the greater the lifting risk.
[0004] The larger the wrap angle between the hoisting rope and the reversing rope pulley, the more difficult it is to operate during disassembly and assembly, and the more time-consuming and labor-intensive it is. Utility Model Content
[0005] The purpose of this invention is to provide a rope-threading structure for hoisting the derrick of a land drilling rig, in order to solve the problems mentioned in the background art, such as excessive pulley wrap angle in existing derrick hoisting structures, which leads to complex structural stress, short wire rope life, and low assembly and disassembly efficiency.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a rope-threading structure for hoisting a land drilling rig derrick, comprising a base fixedly installed on the ground and a hoisting rope; a front-opening K-type derrick is vertically installed above the base, and a connecting lug is provided at the top of the derrick; A-frames are symmetrically installed on both sides of the base, and a fourth reverse rope pulley is provided on the outer side of the top crossbeam of the A-frame; a first reverse rope pulley, a second reverse rope pulley, and a third reverse rope pulley are sequentially arranged along the lower part of the derrick, wherein the first reverse rope pulley, the second reverse rope pulley, and the third reverse rope pulley... A set of reverse rope pulleys is formed, wherein the rotation axes of the second and third reverse rope pulleys are parallel and the pulley sides are coplanar; a balance support is fixed inside the derrick and a traveling block is suspended therefrom; the hoisting rope, one end of which is connected to a connecting lug, passes sequentially around the fourth, first, second, and third reverse rope pulleys, and then passes through the outside of the derrick into the inside and is fixed to the balance support; wherein the derrick and the A-frame are symmetrically structured, and the rotation axis of the fourth reverse rope pulley is parallel to the rotation axis of the first reverse rope pulley.
[0007] Preferably, the rope groove of the second rope-reversing pulley is aligned with the rope groove of the first rope-reversing pulley, and the second rope-reversing pulley is arranged biased towards the outside of the derrick, while the third rope-reversing pulley is arranged biased towards the inside of the derrick.
[0008] Preferably, the rotation axis of the fourth inverted rope pulley is perpendicular to the rotation axis of the second inverted rope pulley.
[0009] Preferably, the rope grooves of the second and third reverse rope pulleys are aligned, and the installation position of the third reverse rope pulley is lower than that of the second reverse rope pulley.
[0010] Preferably, the top crossbeam of the A-frame is provided with fourth inverted rope pulleys symmetrically on both outer sides.
[0011] Preferably, the arrangement of the first, second, and third reverse rope pulleys at the lower part of the derrick, together with the fourth reverse rope pulley of the A-frame, forms a multi-level guide path, so that the wrap angle of the hoisting rope is less than 90°.
[0012] The working process of this utility model is as follows:
[0013] Initial installation and fixing: The front-opening K-type derrick is vertically fixed to the base, and a connecting lug is welded to its top; the A-frame is symmetrically installed on both sides of the base, and a fourth reverse rope pulley is provided on the outer side of the top crossbeam of each frame; the lower part of the derrick is sequentially installed with the first reverse rope pulley, the second reverse rope pulley and the third reverse rope pulley, wherein the second reverse rope pulley is biased to the outer side of the derrick and the third reverse rope pulley is biased to the inner side, and the axes of the two are parallel and the rope grooves are aligned.
[0014] Hoisting rope path: One end of the hoisting rope is fixed to the connecting lug plate at the top of the derrick; starting from the connecting lug plate, the hoisting rope first passes around the fourth inverted rope pulley at the top of the A-frame to achieve initial directional guidance; then, the hoisting rope descends along the derrick, passing around the first, second, and third inverted rope pulleys set at the bottom of the derrick in sequence to form multi-stage guidance; the coplanar arrangement of the second and third inverted rope pulleys ensures the accuracy of the hoisting rope path and avoids uneven wear; finally, the hoisting rope passes from the outside of the derrick 1 into the inside, and the end is fixed to the balance support inside the derrick.
[0015] Lifting process and load distribution: After the lifting system is started, the traveling car rises along the inside of the derrick with the movement of the lifting rope; the balance support distributes the load through a multi-stage pulley system, reducing the force on a single point and ensuring a smooth lifting process; the synergistic effect of the fourth reverse rope pulley and the lower pulley system of the derrick reduces the wrap angle of the lifting rope to below 75°, significantly reducing the stress on the pulleys and the derrick structure and improving safety.
[0016] Symmetrical structure and adaptability: The symmetrical design of the derrick and A-frame, as well as the symmetrical arrangement of the inverted rope pulley block, ensures that the lifting rope is evenly stressed on both sides, adapting to complex working conditions such as high wind pressure and heavy load.
[0017] The beneficial effects of this utility model are as follows:
[0018] (1) In this utility model, the hoisting rope and the inverted rope pulley on the derrick have changed the traditional large wrap angle structure. The wrap angle of the hoisting rope is significantly reduced, and the force of the hoisting rope on the pulley and derrick is significantly reduced during hoisting, which improves the safety and reliability of the derrick structure.
[0019] (2) This utility model changes the way the hoisting rope of the derrick enters the derrick from the outside of the derrick. The small wrap angle of the reverse rope pulley can effectively reduce the damage to the wire rope.
[0020] (3) The coplanar arrangement of the second and third reverse rope pulleys in this utility model ensures accurate guidance of the lifting rope and avoids uneven wear. Attached Figure Description
[0021] Figure 1 This is the main structural view of this utility model;
[0022] Figure 2 This is a partial view of the lower pulley section of the derrick structure of this utility model;
[0023] Figure 3 This is a top view of the main structural view of this utility model;
[0024] In the diagram: 1. Derrick; 2. Connecting lugs; 3. Hoisting rope; 4. A-frame; 5. Fourth reverse rope pulley; 6. Base; 7. First reverse rope pulley; 8. Second reverse rope pulley; 9. Third reverse rope pulley; 10. Balance support; 11. Traveling trolley. Detailed Implementation
[0025] The present invention will now be described in further detail with reference to the accompanying drawings.
[0026] like Figure 1 As shown, the derrick 1 is a front-opening K-type structure. The derrick 1 is installed on the base 6. The derrick 1 is equipped with a hoisting rope 3 and a connecting lug 2 for connecting the derrick. The lower part of the derrick 1 is equipped with a first reverse rope pulley 7, a second reverse rope pulley 8 and a third reverse rope pulley 9 for guidance and hoisting. The A-frame 4 is installed on the base 6. The outer side of the top crossbeam of the A-frame 4 is equipped with a fourth reverse rope pulley 5. The interior of the derrick 1 is equipped with a balance support 10 and a traveling block 11. One end of the hoisting rope 3 is connected to the connecting lug 2, then passes around the fourth reverse rope pulley 5, and then passes around the first reverse rope pulley 7, the second reverse rope pulley 8 and the third reverse rope pulley 9. The hoisting rope 3 enters the interior of the derrick from the outside of the derrick. The other end of the hoisting rope 3 is connected to the balance support 10.
[0027] like Figure 2As shown, the lower part of the derrick 1 is equipped with a first reverse rope pulley 7, a second reverse rope pulley 8, and a third reverse rope pulley 9 for guiding and hoisting. The rotation axis of the fourth reverse rope pulley 5 is parallel to the rotation axis of the first reverse rope pulley 7, and the fourth reverse rope pulley 5 is located on the outer side of the derrick 1. The rotation axes of the second reverse rope pulley 8 and the third reverse rope pulley 9 are parallel, and the sides of the two pulleys are coplanar. The rotation axis of the fourth reverse rope pulley 5 is perpendicular to the rotation axis of the second reverse rope pulley 8. The rope groove of the second reverse rope pulley 8 is aligned with the rope groove of the first reverse rope pulley 7. The rope groove of the second reverse rope pulley 8 is aligned with the rope groove of the third reverse rope pulley 9. The second reverse rope pulley 8 is positioned biased towards the outer side of the derrick 1. The third reverse rope pulley 9 is positioned biased towards the inner side of the derrick 1.
[0028] like Figure 3 As shown, the derrick 1 and the A-frame 4 are symmetrical structures.
[0029] The working process of this utility model is as follows:
[0030] Initial installation and fixing: The front-opening K-type derrick 1 is vertically fixed on the base 6, and a connecting ear plate 2 is welded to its top; the A-frame 4 is symmetrically installed on both sides of the base 6, and a fourth reverse rope pulley 5 is provided on the outer side of the top crossbeam of each of them; the lower part of the derrick 1 is sequentially installed with a first reverse rope pulley 7, a second reverse rope pulley 8 and a third reverse rope pulley 9, wherein the second reverse rope pulley 8 is biased to the outside of the derrick and the third reverse rope pulley 9 is biased to the inside, and the axes of the two are parallel and the rope grooves are aligned.
[0031] The hoisting rope path: One end of the hoisting rope 3 is fixed to the connecting lug 2 at the top of the derrick; starting from the connecting lug 2, the hoisting rope 3 first passes around the fourth inverted rope pulley 5 at the top of the A-frame 4 to achieve initial directional guidance; then, the hoisting rope 3 descends along the derrick 1, passing around the first inverted rope pulley 7, the second inverted rope pulley 8 and the third inverted rope pulley 9 set at the bottom of the derrick in sequence to form multi-stage guidance; the coplanar arrangement of the second inverted rope pulley 8 and the third inverted rope pulley 9 ensures the accuracy of the hoisting rope 3 path and avoids uneven wear; finally, the hoisting rope 3 passes from the outside of the derrick 1 into the inside, and the end is fixed to the balance support 10 inside the derrick.
[0032] Lifting process and load distribution: After the lifting system is started, the traveling trolley 11 rises along the inside of the derrick 1 with the movement of the lifting rope 3; the balance support 10 distributes the load through a multi-stage pulley system, reducing the force on a single point and ensuring a smooth lifting process; the fourth reverse rope pulley 5 works in conjunction with the pulley system at the bottom of the derrick to reduce the wrap angle of the lifting rope 3 to below 75°, significantly reducing the force on the pulleys and the derrick structure and improving safety.
[0033] Symmetrical structure and adaptability: The symmetrical design of the derrick 1 and A-frame 4, as well as the symmetrical arrangement of the inverted rope pulley block, ensures that the lifting rope 3 is subjected to uniform force on both sides, adapting to complex working conditions such as high wind pressure and heavy load.
[0034] In summary, this utility model is applicable to the derrick lifting operation of land oil and gas drilling rigs, and is especially suitable for harsh environments with high wind pressure and high load, which can significantly reduce maintenance costs and improve operating efficiency.
[0035] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.
Claims
1. A rope-threading structure for hoisting the derrick of a land drilling rig, characterized in that, It includes a base (6) fixedly installed on the ground and a hoisting rope (3). A front-opening K-type derrick (1) is vertically installed above the base (6). A connecting ear plate (2) is provided on the top of the derrick (1). A-frames (4) are symmetrically installed on both sides of the base (6). A fourth rope pulley (5) is provided on the outer side of the top beam of the A-frame (4). A first reverse rope pulley (7), a second reverse rope pulley (8), and a third reverse rope pulley (9) are sequentially arranged along the lower part of the derrick (1). The first reverse rope pulley (7), the second reverse rope pulley (8), and the third reverse rope pulley (9) form a reverse rope pulley group. The rotation axes of the second reverse rope pulley (8) and the third reverse rope pulley (9) are parallel and their side surfaces are coplanar. The derrick (1) is internally fixed with a balance support (10) and a traveling carriage (11) is suspended therefrom. The hoisting rope (3) is connected at one end to the connecting ear plate (2), passes through the fourth reverse rope pulley (5), the first reverse rope pulley (7), the second reverse rope pulley (8) and the third reverse rope pulley (9) in sequence, and then passes through the outside of the derrick (1) into the inside and is fixed to the balance support (10). Among them, the derrick (1) and the A-frame (4) are symmetrical structures, and the rotation axis of the fourth inverted rope pulley (5) is parallel to the rotation axis of the first inverted rope pulley (7).
2. The rope-threading structure for hoisting a land drilling rig derrick according to claim 1, characterized in that: The rope groove of the second inverted rope pulley (8) is aligned with the rope groove of the first inverted rope pulley (7), and the second inverted rope pulley (8) is arranged biased towards the outside of the derrick (1), while the third inverted rope pulley (9) is arranged biased towards the inside of the derrick (1).
3. A rope-threading structure for hoisting a land drilling rig derrick according to claim 1 or 2, characterized in that: The rotation axis of the fourth inverted rope pulley (5) is perpendicular to the rotation axis of the second inverted rope pulley (8).
4. The rope threading structure for hoisting a land drilling rig derrick according to claim 3, characterized in that: The rope grooves of the second rope pulley (8) and the third rope pulley (9) are aligned, and the installation position of the third rope pulley (9) is lower than that of the second rope pulley (8).
5. The rope threading structure for hoisting a land drilling rig derrick according to claim 4, characterized in that: The top beam of the A-frame (4) is symmetrically equipped with fourth inverted rope pulleys (5) on both outer sides.
6. The rope threading structure for hoisting a land drilling rig derrick according to claim 5, characterized in that: The arrangement of the first reverse rope pulley (7), the second reverse rope pulley (8) and the third reverse rope pulley (9) at the lower part of the derrick (1) together with the fourth reverse rope pulley (5) of the A-frame (4) forms a multi-level guide path, so that the wrap angle of the hoisting rope (3) is less than 90°.