An auxiliary cantilever crane for a mast, a control method, and a drilling rig.

Abstract

This invention provides an auxiliary cantilever crane, control method, and drilling rig for use on a mast. The cantilever crane includes a cantilever mechanism and a winch mounted on the mast. The cantilever mechanism includes a rotatable cylinder, a first pulley, and a telescopic cantilever. The first pulley is mounted on the rotatable cylinder via a first pin, and a portion of the first pulley is located within the inner cavity of the rotatable cylinder. The telescopic cantilever is hinged to the rotatable cylinder via the first pin. The cantilever mechanism also includes a pitch cylinder and a wire rope. The telescopic end of the pitch cylinder is hinged to the telescopic cantilever, and the end away from the telescopic end is hinged to the lower part of the rotatable cylinder. A second pulley is provided at the end of the telescopic cantilever away from the first pulley. The wire rope is wound on the winch, and one end of the wire rope enters the inner cavity of the rotatable cylinder from the bottom, passes through the first pulley, and then winds around the second pulley. A lifting device is provided near the end of the second pulley. This invention has stronger construction capabilities, a wider construction range, and greater adaptability.

Description

Technical Field

[0001] This invention relates to the field of engineering machinery technology, and in particular to an auxiliary cantilever crane for masts, a control method, and a drilling rig. Background Technology

[0002] During drilling operations, frequent drilling and tripping operations are required, which necessitates drill pipe connection and disconnection operations. When drilling and tripping or connecting drill pipes at the wellhead, the power head on the mast descends to above the wellhead operating platform and then tilts back. At this time, a lifting device, i.e. a cantilever crane, needs to be installed on the mast to lift the drill pipe.

[0003] Traditionally, a hydraulic winch is used to lift one end of the drill pipe by bypassing a pulley on a cantilever crane and using a wire rope locking device. This ensures that the drill pipe and the raised power head coupling end form the same angle. A simple pulley at the wellhead is used to drag the drill pipe, causing the drill pipe coupling end to engage with the raised power head. The power head then rotates to complete the coupling operation, and finally lifts the drill pipe to the wellhead. During tripping and uncoupling operations, the cantilever crane is also required, using a winch and wire rope locking device in conjunction with the above reverse operation to uncouple the drill pipe. The drill pipe can then be lowered onto the wellhead pulley and placed onto the wellhead pipe rack. Simultaneously, various drilling tools (drill bits, subs, drill collars, logging instruments, etc.) need to be hoisted at the wellhead, all requiring the cantilever crane for lifting and support. However, existing cantilever cranes have the following problems:

[0004] 1. The working range is too small: a. The coverage angle in the plane is small; b. The coverage distance from the wellhead is short, which greatly limits its working range.

[0005] 2. When the wellhead power head moves up and down, the jib crane cannot avoid the wellhead working space; when transporting the whole machine, the jib crane cannot be retracted, affecting the transport height and width of the whole machine;

[0006] 3. When hoisting the wellhead drilling tools, the position of the hoisted object is generally significantly different from the front-to-back and left-to-right angle of the rope outlet of the cantilever. This causes the limiting device (to prevent the wire rope from going out of the groove) at the rope outlet of the pulley to be subjected to great force and wear. This can easily cause the wire rope to go out of the groove and get stuck in the gap between the limiting device and the pulley, making the wire rope stuck and preventing it from working.

[0007] Therefore, there is an urgent need for an auxiliary cantilever crane, control method, and drilling rig for masts, which has stronger construction capabilities, a wider construction range, and greater adaptability. Summary of the Invention

[0008] The purpose of this invention is to provide an auxiliary cantilever crane, control method and drilling rig for masts, which aims to solve the technical problems of traditional cantilever cranes such as limited operating range, inability to avoid power heads and retraction.

[0009] To achieve the above objectives, in a first aspect, the present invention provides an auxiliary cantilever crane for a mast, comprising a cantilever mechanism and a winch arranged vertically at intervals on the mast.

[0010] The cantilever mechanism includes a rotatable cylindrical column, a first pulley disposed on the upper part of the rotatable cylindrical column, and a telescopic cantilever. The first pulley is disposed on the rotatable cylindrical column by a first pin, and a portion of the first pulley is located in the inner cavity of the rotatable cylindrical column. The telescopic cantilever is hinged to the rotatable cylindrical column by the first pin.

[0011] The cantilever mechanism also includes a pitch cylinder and a wire rope. The telescopic end of the pitch cylinder is hinged to the telescopic cantilever, and the part away from the telescopic end is hinged to the lower part of the rotating cylinder.

[0012] The telescopic cantilever is provided with a second pulley at the end away from the first pulley. The wire rope is wound on the winch, and one end of the wire rope enters the inner cavity of the rotatable cylinder from the bottom, passes through the first pulley, and is wound around the second pulley. A lifting device is provided near the end of the second pulley.

[0013] As a further improvement to the above solution, the rotatable cylinder is vertically and rotatably mounted on the side of the mast via a mounting base; preferably, the rotatable cylinder is vertically and rotatably mounted on the side of the mast via an upper mounting base and a lower mounting base.

[0014] As a further improvement to the above solution, the rotatable cylinder is mounted on the mounting base via a rotation drive device;

[0015] The rotatable cylinder includes a rotating cylinder and a rotating shaft disposed at one end of the rotating cylinder, the other end of the rotating cylinder being connected to the rotating end of the rotating drive device; the rotating shaft is rotatably connected to the mounting base.

[0016] As a further improvement to the above solution, the rotary drive device is a slewing drive device, preferably a worm gear slewing drive device or a gear slewing drive device.

[0017] The rotating drum is connected to the slewing bearing of the slewing drive device.

[0018] As a further improvement to the above solution, the upper part of the rotating drum is provided with an opening for the first pulley to extend into its inner cavity;

[0019] Rotary drum lugs are provided on both sides of the opening. The first pin is rotatably mounted on the two rotary drum lugs, and the first pulley is located between the two rotary drum lugs and is rotatably mounted on the first pin.

[0020] As a further improvement to the above solution, the telescopic cantilever includes at least a main arm, a movable arm sleeved within the main arm, and a telescopic power source disposed within the main arm for pushing the movable arm to extend and retract.

[0021] One end of the main arm is hinged to the rotatable cylinder via the first pin, and the second pulley is disposed on the movable arm away from the hinge end;

[0022] The bottom of the main boom is provided with a hinge seat, and the telescopic end of the pitch cylinder is hinged to the telescopic cantilever through the hinge seat.

[0023] As a further improvement to the above solution, the telescopic power is a boom cylinder, and the rodless end of the boom cylinder is connected to the main boom, while the rod end is connected to the movable boom.

[0024] As a further improvement to the above solution, the second pulley is rotatably mounted on the end of the telescopic cantilever arm away from the first pulley via a pulley seat;

[0025] The pulley seat includes a seat body and two pulley bracket baffles disposed on the seat body. The two pulley bracket baffles are disposed at intervals on the seat body, and the second pulley is located between the two pulley bracket baffles.

[0026] The pulley seat also includes a rope-blocking rod and a wear-resistant plate. The rope-blocking rod is disposed between the two pulley bracket baffles to prevent the wire rope from detaching from the pulley groove of the second pulley.

[0027] The wear-resistant plates are respectively disposed on the inner side of the two pulley bracket baffles to fill the gap between the pulley bracket baffles and the second pulley.

[0028] As a further improvement to the above solution, a rope-blocking sleeve is also provided outside the rope-blocking rod, and the gap between the rope-blocking sleeve and the edge of the second pulley is less than or equal to a preset distance.

[0029] As a further improvement to the above solution, the bottom of the rotatable cylinder is provided with an anti-wear structure to prevent wear on the wire rope;

[0030] The wear-resistant structure includes at least three wear-resistant stops, and the three wear-resistant stops are staggered to form a gap for the wire rope to pass through.

[0031] As a further improvement to the above solution, the wear-resistant stop bar includes a stop bar body and a protective sleeve fitted on the outer wall of the stop bar body.

[0032] As a further improvement to the above solution, the top of the rotatable cylinder is rotatably mounted on the side of the mast via an upper mounting base; the bottom of the rotatable cylinder is rotatably mounted on the side of the mast via a lower mounting base.

[0033] The rotary drive device is disposed on the upper surface of the lower mounting base, and the wear-resistant structure is disposed on the lower surface of the lower mounting base.

[0034] In a second aspect, the present invention also provides a control method for an auxiliary cantilever crane on a mast as described in the first aspect, the steps of which include:

[0035] During transportation, the telescopic cantilever is controlled to retract to its shortest state, and the pitch cylinder extends to control the telescopic cantilever to be parallel to the mast and close to the mast.

[0036] During operation, the pitch cylinder retracts and controls the telescopic boom to form a suitable angle with the mast. At the same time, the rotation angle of the rotatable cylinder and the extension length of the telescopic boom are adjusted to make the lifting device aligned with the center of the wellhead.

[0037] When the power head floats up and down, adjust the rotation angle of the rotatable cylinder to make the telescopic cantilever avoid the wellhead working space.

[0038] Thirdly, the present invention also provides a drilling rig, including a drilling rig body and a mast disposed on the drilling rig body, wherein the mast is provided with an auxiliary cantilever crane as described in the first aspect.

[0039] Because the present invention adopts the above technical solutions, the beneficial effects of this application are as follows:

[0040] This invention provides an auxiliary cantilever crane for masts. By incorporating a rotatable cylinder, a telescopic cantilever, and a pitch cylinder into the cantilever mechanism, and by hinged the telescopic cantilever to the rotatable cylinder, and by hinged the telescopic end of the pitch cylinder to the telescopic cantilever and the lower part of the rotatable cylinder to the end furthest from the telescopic end, the telescopic cantilever can assume different postures. Specifically, during transport, the pitch cylinder extends and drives the telescopic cantilever to be parallel to and close to the mast, thus avoiding issues of equipment exceeding height and width limits during transport. Furthermore, the rotatable cylinder allows the telescopic cantilever and the pitch cylinder to rotate within a certain angle range, preventing interference with the wellhead power head when it floats up and down; a simple rotation at a certain angle is sufficient to avoid obstructing the wellhead working space.

[0041] Furthermore, the boom is a telescopic boom, meaning its length can be extended and adjusted. Combined with the pitch cylinder, the telescopic boom can be raised to different angles, thereby increasing the working angle of the cantilever crane and the distance between the rope outlet and the wellhead center. Furthermore, the rotatable cylinder allows the telescopic boom and the pitch cylinder to rotate within a wide angle range, thus increasing the crane's coverage angle in the plane, and consequently, expanding the working range of the cantilever crane. This enables it to handle both 5T heavy loads for short-distance lifting and 1.2T long-distance lifting. Ultimately, this enhances the construction capacity, working range, and adaptability of this auxiliary cantilever crane.

[0042] Furthermore, in some preferred embodiments, the second pulley is disposed at the end of the boom away from the hinge via a pulley seat, a rope-blocking rod and a rope-blocking sleeve are disposed on the pulley seat, and a wear-resistant plate is provided on the inner side of the two pulley support baffles to fill the gap between the pulley support baffles and the second pulley, thereby effectively preventing the wire rope from derailing or getting stuck at the rope exit pulley end;

[0043] In some preferred embodiments, the bottom of the rotatable cylinder is provided with an anti-wear structure to prevent the wire rope from wearing out; the anti-wear structure includes at least three anti-wear stops, and the three anti-wear stops are staggered to form a gap for the wire rope to pass through; the anti-wear structure can effectively prevent the wire rope from wearing out and being damaged. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 This is a three-dimensional schematic diagram of an auxiliary cantilever crane mounted on a mast, as disclosed in this invention. Figure 1 Image (a) is a three-dimensional schematic diagram showing the telescopic boom perpendicular to the mast when the auxiliary cantilever crane is in operation. Figure 1 (b) is a three-dimensional schematic diagram showing the telescopic boom parallel and close to the mast during the transport of the auxiliary cantilever crane;

[0046] Figure 2 This is a three-dimensional schematic diagram of an auxiliary cantilever crane for a mast disclosed in this invention;

[0047] Figure 3This is a side view schematic diagram of an auxiliary cantilever crane for a mast disclosed in this invention;

[0048] Figure 4 for Figure 3 AA sectional view;

[0049] Figure 5 This is a three-dimensional perspective view of the attitude of a telescopic cantilever for an auxiliary cantilever crane on a mast, as disclosed in this invention. Figure 5 Image (a) is a three-dimensional schematic diagram showing the telescopic cantilever arm parallel and close to the mast during transport. Figure 5 Image (b) is a three-dimensional schematic diagram showing the telescopic cantilever arm forming a preset angle with the mast during operation. Figure 5 (c) is a three-dimensional schematic diagram showing the telescopic cantilever perpendicular to the mast during operation;

[0050] Figure 6 This is a schematic diagram of the working posture and working area of ​​an auxiliary cantilever crane on a mast when lifting a 5T weight, as disclosed in this invention. Figure 6 Image (a) is a three-dimensional schematic diagram of the telescopic cantilever's posture when lifting a 5-ton weight. Figure 6 (b) is a schematic diagram of the working area when lifting a 5-ton weight;

[0051] Figure 7 This is a schematic diagram of the working posture and working area of ​​an auxiliary cantilever crane on a mast for lifting a weight of 1.2T, as disclosed in this invention. Figure 7 Image (a) is a three-dimensional schematic diagram of the telescopic cantilever arm's posture when lifting a weight of 1.2T. Figure 7 (b) is a schematic diagram of the working area when lifting a weight of 1.2T;

[0052] Figure 8 This is a perspective view of the second pulley of the present invention mounted on the pulley seat;

[0053] Figure 9 This is a perspective view of the wear-resistant structure disclosed in this invention mounted on the lower mounting base.

[0054] Figure label:

[0055] 01. Cantilever mechanism; 11. Rotatable cylinder; 111. Rotating cylinder; 112. Rotating shaft; 113. Opening; 114. Rotating cylinder lug;

[0056] 12. First pulley; 13. Telescopic cantilever; 131. Main boom; 132. Movable boom; 133. Telescopic power source; 134. Hinge base;

[0057] 14. First pin; 15. Pitch cylinder; 16. Wire rope; 17. Second pulley; 18. Lifting device; 19. Upper mounting base; 20. Lower mounting base; 21. Rotary drive device;

[0058] 22. Pulley seat; 221. Seat body; 222. Pulley bracket baffle; 223. Rope guide rod; 224. Wear-resistant plate; 225. Rope guide sleeve;

[0059] 23. Wear-resistant structure; 231. Wear-resistant stop bar; 02. Winch; 03. Mast.

[0060] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0063] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0064] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0065] Example 1

[0066] See Figures 1-9 The present invention provides an auxiliary cantilever crane for a mast, including a cantilever mechanism 01 and a winch 02 arranged at intervals on the mast 03. For ease of lifting, the cantilever mechanism 01 is arranged on the upper side of the mast 03, and the winch 02 is arranged below the cantilever mechanism 01.

[0067] The cantilever mechanism 01 includes a rotatable cylinder 111 column 11, a first pulley 12 disposed on the upper part of the rotatable cylinder 111 column 11, and a telescopic cantilever 13. The rotatable cylinder 111 column 11 is vertically and rotatably disposed on the side of the mast 03 via a mounting base. The first pulley 12 is disposed on the rotatable cylinder 111 column 11 via a first pin 14, and part of the first pulley 12 is located in the inner cavity of the rotatable cylinder 111 column 11. The telescopic cantilever 13 is hinged to the rotatable cylinder 111 column 11 via the first pin 14.

[0068] The cantilever mechanism 01 also includes a pitch cylinder 15 and a wire rope 16. The telescopic end of the pitch cylinder 15 is hinged to the telescopic cantilever 13, and the part away from the telescopic end is hinged to the lower part of the rotating cylinder 111 column.

[0069] The telescopic cantilever 13 is provided with a second pulley 17 at the end away from the first pulley 12. The wire rope 16 is wound on the winch 02, and one end of it enters the inner cavity of the rotatable cylinder 111 column 11 from the bottom, passes through the first pulley 12, and is wound around the second pulley 17. A lifting device 18 is provided near the end of the second pulley 17.

[0070] This invention, by providing a rotatable cylinder 111 column 11, a telescopic cantilever 13, and a pitch cylinder 15 on a cantilever mechanism 01, with the telescopic boom hinged to the rotatable cylinder 111 column 11, and the telescopic end of the pitch cylinder 15 hinged to the telescopic cantilever 13, while the part away from the telescopic end is hinged to the lower part of the rotatable cylinder 111 column, allows the telescopic cantilever 13 to assume different postures. Specifically, for transportation, see... Figure 1 In section (b), the pitch cylinder 15 extends and drives the telescopic cantilever 13 to be parallel to and close to the mast 03, thereby avoiding the problem of equipment exceeding height and width limits during transportation; during operation, see... Figure 1 (a) Figure 5 (b) and Figure 5 In the middle (c), the pitch cylinder 15 extends and drives the telescopic cantilever 13 to be perpendicular to the mast 03 or at a preset angle, so that the working angle of the cantilever crane and the distance from the rope outlet to the center of the wellhead can be adjusted to adapt to different working conditions;

[0071] In conjunction with the configuration of the rotatable cylinder 111 and column 11, see [reference needed]. Figure 6 and Figure 7 This allows the rotatable cylinder 111 column 11 to drive the telescopic cantilever 13 and the pitch cylinder 15 to rotate within a certain angle range, thereby avoiding interference with the power head when the wellhead power head floats up and down. It only needs to rotate a certain angle to avoid the wellhead working space.

[0072] Furthermore, the boom is a telescopic boom, meaning its length can be adjusted. Combined with the pitch cylinder 15, the telescopic boom can be raised to different angles, thereby increasing the working angle of the cantilever crane and the distance between the rope outlet and the wellhead center. Furthermore, the rotatable cylinder 111 allows the rotatable cylinder 111 to drive the telescopic boom 13 and the pitch cylinder 15 to rotate within a large angle range, thus improving the crane's coverage angle in the plane, i.e., increasing the working range of the cantilever crane. This allows it to handle both 5T heavy loads for short-distance lifting and 1.2T long-distance lifting. Consequently, it enhances the construction capacity, construction range, and adaptability of this auxiliary cantilever crane.

[0073] See Figure 6 To achieve close-range lifting of a 5T heavy object, the pitch cylinder 15 adjusts the cantilever crane's posture. Specifically, the piston rod of the pitch cylinder 15 extends, causing the telescopic cantilever 13 to rotate towards the top of the mast 03, and making the axis of the telescopic cantilever 13 form an angle of approximately 45° with the axis of the rotatable cylinder 111 extending towards the top of the mast 03. Simultaneously, the telescopic cantilever 13 is controlled to be in its shortest retracted state. Figure 6 As shown in (a); at this time, the suspension radius is 2.14m, the vertical distance of the lifting point from the wellhead is 1.17m, and by controlling the rotation of the rotatable cylinder 111 column 11, the following can be achieved: Figure 6 Lifting of a 5T heavy load within a 240° coverage angle and range shown in (b);

[0074] See Figure 7 To achieve a 1.2T long-distance lifting load, the pitch cylinder 15 adjusts the cantilever crane's posture. Specifically, the pitch cylinder 15 makes the axis of the telescopic cantilever 13 form an angle of approximately 90° with the axis of the rotatable cylinder 111 column 11 extending towards the top of the mast 03, while simultaneously controlling the telescopic cantilever 13 to be in its longest extended state. Figure 7 As shown in (a); at this time, the suspension radius is 3.315m, the vertical distance of the lifting point from the wellhead is 2.455m, and by controlling the rotation of the rotatable cylinder 111 column 11, the following can be achieved: Figure 7 The 240° coverage angle and range shown in (b) indicate a 1.2T long-distance suspended object.

[0075] In a preferred embodiment, the rotatable cylinder 111 column 11 is vertically and rotatably mounted on the side of the mast 03 via an upper mounting base 19 and a lower mounting base 20;

[0076] The rotatable cylinder 111 column 11 is mounted on the mounting base via a rotation drive device 21;

[0077] The rotatable cylinder 111 column 11 includes a rotating cylinder 111 and a rotating shaft 112 disposed at one end of the rotating cylinder 111. The other end of the rotating cylinder 111 is connected to the rotating end of the rotating drive device 21. The rotating shaft 112 is rotatably connected to the upper mounting base 19.

[0078] Specifically, the upper mounting base 19 includes a vertically arranged upper mounting plate and an upper horizontal plate arranged perpendicular to the upper mounting plate. The upper horizontal plate is provided with an upper through hole, and the rotating shaft 112 is rotatably connected to the upper through hole through a bearing or bushing. The lower mounting base 20 includes a vertically arranged lower mounting plate and a lower horizontal plate arranged perpendicular to the lower mounting plate. The lower horizontal plate is provided with a lower through hole that matches the rotary drive device 21.

[0079] Preferably, the rotary drive device 21 is a slewing drive device, specifically a worm gear slewing drive device or a gear slewing drive device; the rotating drum 111 is connected to the slewing bearing of the slewing drive device.

[0080] In this embodiment, the rotary drive device 21 is a worm gear rotary drive device. The wire rope 16 passes through the lower through hole and the middle hole of the rotary support, enters the inner cavity of the rotating drum 111, and is then wound around the first pulley 12.

[0081] In a preferred embodiment, the upper part of the rotating drum 111 is provided with an opening 113 for the partial first pulley 12 to extend into its inner cavity;

[0082] Rotary drum lugs 114 are provided on both sides of the opening 113. The first pin 14 is rotatably mounted on the two rotary drum lugs 114, and the first pulley 12 is located between the two rotary drum lugs 114 and is rotatably mounted on the first pin 14.

[0083] With this configuration, the first pulley 12 is placed on the rotating drum 111, and the first pin 14 can also be used as the hinge pivot 112 of the telescopic cantilever 13. This makes the cantilever crane mechanism compact, allowing the telescopic cantilever 13 to present multiple postures while ensuring that the wire rope 16 is simply and effectively wound, thus avoiding interference of the wire rope 16 during the posture switching of the telescopic cantilever 13.

[0084] In a preferred embodiment, the telescopic cantilever 13 includes at least a main arm 131, a movable arm 132 sleeved in the main arm 131, and a telescopic power 133 disposed in the main arm 131 for pushing the movable arm 132 to extend and retract.

[0085] One end of the main arm 131 is hinged to the two rotating cylinder lugs 114 on the rotatable cylinder 111 column 11 via the first pin 14, and the second pulley 17 is disposed on the movable arm 132 away from the hinge end.

[0086] The bottom of the main boom 131 is provided with a hinge seat 134, and the telescopic end of the pitch cylinder 15 is hinged to the telescopic cantilever 13 through the hinge seat 134.

[0087] Preferably, the telescopic power 133 is a boom cylinder, and the rodless end of the boom cylinder is connected to the main boom 131, and the rod end is connected to the movable boom 132.

[0088] Specifically, the main arm 131 includes two parallel and flush side plates, a top plate disposed on the top of the two side plates, and a hinge seat 134 disposed at the bottom of the two side plates; the two side plates at the hinge end of the main arm 131 extend into main arm 131 lugs, and the main arm 131 lugs are provided with main arm 131 hinge holes that match the first pin 14, and the two main arm 131 lugs are respectively disposed on the outer side of the rotary drum lug 114;

[0089] The inner cavity of the main boom 131 is also provided with a cylinder mounting seat for installing the boom cylinder, and a guide sleeve or guide plate for guiding the movable boom 132; the movable boom 132 is provided with a connecting support for connecting the rod end of the boom cylinder; with such a configuration, controlling the boom cylinder can drive the extension and retraction of the movable boom 132.

[0090] As a preferred embodiment, see Figure 8 The second pulley 17 is rotatably disposed at the end of the telescopic cantilever 13 away from the first pulley 12 via the pulley seat 22;

[0091] The pulley seat 22 includes a seat body 221 and two pulley bracket baffles 222 disposed on the seat body 221. The two pulley bracket baffles 222 are disposed at intervals on the seat body 221, and the second pulley 17 is located between the two pulley bracket baffles 222.

[0092] The pulley seat 22 also includes a rope-blocking rod 223 and a wear-resistant plate 224. The rope-blocking rod 223 is disposed between the two pulley bracket baffles 222 to prevent the wire rope 16 from coming off the pulley groove of the second pulley 17.

[0093] The wear-resistant plates 224 are respectively disposed on the inner side of the two pulley bracket baffles 222 to fill the gap between the pulley bracket baffles 222 and the second pulley 17; preferably, the wear-resistant plates 224 are made of nylon, and the wear-resistant plates 224 are connected to the inner side of the pulley bracket baffles 222 by screws; the presence of the wear-resistant plates 224 ensures that even if the wire rope 16 jumps out of the rope groove of the second pulley 17, the wire rope 16 will not squeeze into the gap and get stuck because the gap has been filled by the wear-resistant plates 224.

[0094] In a preferred embodiment, a rope-blocking sleeve 225 is also provided outside the rope-blocking rod 223, and the gap between the rope-blocking sleeve 225 and the wheel edge of the second pulley 17 is less than or equal to a preset distance;

[0095] The rope-blocking rod 223 effectively prevents the wire rope 16 from being squeezed out of the rope groove of the second pulley 17. A rope-blocking sleeve 225 is also fitted over the rope-blocking rod 223, so that even if the wire rope 16 partially squeezes into contact with the rope-blocking sleeve 225, it will not be worn. Furthermore, a preset distance is provided between the rope-blocking sleeve 225 and the edge of the second pulley 17. In this embodiment, taking a wire rope 16 with a diameter of 16mm as an example, the gap between the rope-blocking sleeve 225 and the edge of the second pulley 17 needs to be adjusted to be less than or equal to 5mm. This arrangement effectively prevents the wire rope 16 from being squeezed out of the rope groove of the second pulley 17.

[0096] As a preferred embodiment, see Figure 9 The bottom of the rotatable cylinder 111 column 11 is provided with an anti-wear structure 23 to prevent the wire rope 16 from wearing.

[0097] The wear-resistant structure 23 includes at least three wear-resistant baffles 231, and the three wear-resistant baffles 231 are staggered to form a gap for the wire rope 16 to pass through.

[0098] In this embodiment, four anti-wear baffles 231 are included, and the four anti-wear baffles 231 are arranged in a crisscross pattern to form a "well" shaped gap;

[0099] Furthermore, the wear-resistant stop bar 231 includes a stop bar body and a protective sleeve fitted on the outer wall of the stop bar body;

[0100] This design effectively prevents wear and tear when the wire rope 16 is lowered from the rotating drum 111 and pulled back and forth during operation.

[0101] In a preferred embodiment, the top of the rotatable cylinder 111 column 11 is rotatably disposed on the side of the mast 03 via the upper mounting base 19; the bottom of the rotatable cylinder 111 column 11 is rotatably disposed on the side of the mast 03 via the lower mounting base 20.

[0102] The rotary drive device 21 is disposed on the upper surface of the lower mounting base 20, and the wear-resistant structure 23 is disposed on the lower surface of the lower mounting base 20.

[0103] Example 2

[0104] The present invention also provides a control method for an auxiliary cantilever crane on a mast as described in Embodiment 1, the steps of which include:

[0105] During transportation, the telescopic cantilever 13 is retracted and placed in its shortest state, while the pitch cylinder 15 extends and controls the telescopic cantilever 13 to be parallel to and close to the mast 03.

[0106] During operation, the pitch cylinder 15 retracts and controls the telescopic cantilever 13 to form a suitable angle with the mast 03. At the same time, the rotation angle of the rotatable cylinder 111 column 11 and the telescopic length of the telescopic cantilever 13 are adjusted so that the lifting device 18 is aligned with the center of the wellhead.

[0107] When the power head floats up and down, adjust the rotation angle of the rotatable cylinder 111 column 11 so that the telescopic cantilever 13 avoids the wellhead working space;

[0108] With this configuration, during transportation, as long as the telescopic boom is controlled to retract and be parallel to and close to the mast 03, the height and width of the equipment will not increase, thus meeting transportation requirements. During operation, the telescopic boom 13 can be moved away from the wellhead working space by rotating the rotatable cylinder 111 column 11, preventing interference with the power head. At the same time, by controlling the extension length of the telescopic boom 13 and the pitch angle of the pitch cylinder 15, the telescopic boom 13 and the mast 03 can be made to form a suitable angle. This ensures that the lifting device 18 is aligned with the center of the wellhead. Even if the wellhead drilling tools are placed off to the sides of the wellhead centerline or on the outside, the lifting device 18 can be adjusted to be aligned with the center of the wellhead by rotating the rotatable cylinder 111 column 11, adjusting the extension amount of the telescopic boom 13, and adjusting the pitch angle of the pitch cylinder 15. This improves the construction capacity, construction range, and adaptability of this auxiliary cantilever crane.

[0109] Example 3

[0110] The present invention also provides a drilling rig, including a drilling rig body and a mast 03 mounted on the drilling rig body. The mast 03 is provided with an auxiliary cantilever crane as described in Embodiment 1. This ensures that the drilling rig does not increase the height and width of the equipment, thus meeting the transportation size requirements. At the same time, it has a large operating range and can be adapted to various working conditions.

[0111] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An auxiliary cantilever crane for use on a mast, characterized in that, This includes cantilever mechanisms and winches spaced at intervals on the mast. The cantilever mechanism includes a rotatable cylindrical column, a first pulley disposed on the upper part of the rotatable cylindrical column, and a telescopic cantilever. The first pulley is disposed on the rotatable cylindrical column by a first pin, and a portion of the first pulley is located in the inner cavity of the rotatable cylindrical column. The telescopic cantilever is hinged to the rotatable cylindrical column by the first pin. The cantilever mechanism also includes a pitch cylinder and a wire rope. The telescopic end of the pitch cylinder is hinged to the telescopic cantilever, and the part away from the telescopic end is hinged to the lower part of the rotating cylinder. The telescopic cantilever is provided with a second pulley at the end away from the first pulley. The wire rope is wound on the winch, and one end of the wire rope enters the inner cavity of the rotatable cylinder from the bottom, passes through the first pulley, and is wound around the second pulley. A lifting device is provided near the end of the second pulley. The telescopic cantilever includes at least a main arm, a movable arm sleeved within the main arm, and a telescopic power source disposed within the main arm for pushing the movable arm to extend and retract. One end of the main arm is hinged to the rotatable cylinder via the first pin, and the second pulley is disposed on the movable arm away from the hinge end; The bottom of the main boom is provided with a hinge seat, and the telescopic end of the pitch cylinder is hinged to the telescopic cantilever through the hinge seat; The second pulley is rotatably mounted on the end of the telescopic cantilever away from the first pulley via a pulley seat; The pulley seat includes a seat body and two pulley bracket baffles disposed on the seat body. The two pulley bracket baffles are disposed at intervals on the seat body, and the second pulley is located between the two pulley bracket baffles. The pulley seat also includes a rope-blocking rod and a wear-resistant plate. The rope-blocking rod is disposed between the two pulley bracket baffles to prevent the wire rope from detaching from the pulley groove of the second pulley. The wear-resistant plates are respectively disposed on the inner side of the two pulley bracket baffles to fill the gap between the pulley bracket baffles and the second pulley.

2. The auxiliary cantilever crane for a mast according to claim 1, characterized in that, The rotatable cylinder is vertically and rotatably mounted on the side of the mast via a mounting base.

3. An auxiliary cantilever crane for a mast according to claim 2, characterized in that, The rotatable cylindrical column is mounted on the mounting base via a rotation drive device; The rotatable cylinder includes a rotating cylinder and a rotating shaft disposed at one end of the rotating cylinder, the other end of the rotating cylinder being connected to the rotating end of the rotating drive device; the rotating shaft is rotatably connected to the mounting base.

4. An auxiliary cantilever crane for a mast according to claim 3, characterized in that, The rotary drive device is a slewing drive device, specifically a worm gear slewing drive device or a gear slewing drive device. The rotating drum is connected to the slewing bearing of the slewing drive device.

5. An auxiliary cantilever crane for a mast according to any one of claims 1-4, characterized in that, The upper part of the rotating drum is provided with an opening for the first pulley to extend into its inner cavity; Rotary drum lugs are provided on both sides of the opening. The first pin is rotatably mounted on the two rotary drum lugs, and the first pulley is located between the two rotary drum lugs and is rotatably mounted on the first pin.

6. An auxiliary cantilever crane for a mast according to any one of claims 1-4, characterized in that, The bottom of the rotatable cylinder is equipped with an anti-wear structure to prevent wear on the wire rope; The wear-resistant structure includes at least three wear-resistant stops, and the three wear-resistant stops are staggered to form a gap for the wire rope to pass through.

7. A control method for an auxiliary cantilever crane on a mast as described in any one of claims 1-6, characterized in that, The steps include: During transportation, the telescopic cantilever is controlled to retract to its shortest state, and the pitch cylinder extends to control the telescopic cantilever to be parallel to the mast and close to the mast. During operation, the pitch cylinder retracts and controls the telescopic boom to form a suitable angle with the mast. At the same time, the rotation angle of the rotatable cylinder and the extension length of the telescopic boom are adjusted to make the lifting device aligned with the center of the wellhead. When the power head floats up and down, adjust the rotation angle of the rotatable cylinder to make the telescopic cantilever avoid the wellhead working space.

8. A drilling rig, characterized in that, It includes a drilling rig body and a mast mounted on the drilling rig body, wherein the mast is equipped with an auxiliary cantilever crane as described in any one of claims 1-6.

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