Auxiliary cantilever crane for mast, control method and drilling machine

Abstract

The invention provides an auxiliary cantilever crane for a mast, a control method and a drilling machine, the cantilever crane comprises a cantilever mechanism and a winch which are arranged on the mast, the cantilever mechanism comprises a rotatable cylinder, a first pulley and a telescopic cantilever, the first pulley is arranged on the rotatable cylinder through a first pin shaft, and the telescopic cantilever is arranged on the first pulley through a second pin shaft; part of the first pulley is located in an inner cavity of the rotatable cylinder, and the telescopic cantilever is hinged to the rotatable cylinder through a first pin shaft. The cantilever mechanism further comprises a pitching oil cylinder and a steel wire rope, the telescopic end of the pitching oil cylinder is hinged to the telescopic cantilever, and the far-telescopic end of the pitching oil cylinder is hinged to the lower portion of the rotating cylinder. A second pulley is arranged at the end, away from the first pulley, of the telescopic cantilever, a steel wire rope is wound on the winch, one end of the steel wire rope enters an inner cavity of the rotatable cylinder from the bottom of the rotatable cylinder and then is wound on the second pulley through the first pulley, and a lifting appliance is arranged at the end, close to the second pulley, of the steel wire rope; the method has the advantages of higher construction capability, larger construction range and higher adaptability.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering machinery, and in particular to an auxiliary cantilever crane used on a mast, a control method and a drilling rig. Background Art

[0002] During the drilling operation, frequent drilling and pulling out operations are required, so it is necessary to carry out drill pipe connection and drill pipe unloading operations. When drilling and connecting the drill pipe at the wellhead, the power head on the mast descends to the top of the wellhead operating platform and then tilts up. At this time, it is necessary to set a lifting device on the mast that can lift the drill pipe, that is, a cantilever crane.

[0003] Traditionally, a hydraulically controlled winch is used as the power to bypass the pulley on the cantilever crane and use a wire rope lock to lift one end of the drill pipe, so that the drill pipe and the tilted power head coupling end form the same angle, and a simple pulley at the wellhead is used to drag the drill pipe so that the drill pipe joint end and the tilted power head are buckled, and then the power head is rotated to achieve the buckling operation, and then the power head lifts the drill pipe to the wellhead. When pulling out the drill and unbuckling the drill pipe, a cantilever crane is also required to use a winch to use a wire rope lock in conjunction with the above-mentioned reverse operation process to unbuck the drill pipe. The drill pipe can then be lowered to the wellhead pulley and placed on the wellhead pipe rack; at the same time, the wellhead needs to hoist various drilling tools (drill bits, short sections, drill collars, logging instruments, etc.), which all require a cantilever crane to hoist and cooperate; but the existing cantilever crane has the following problems: 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, resulting in a large limitation on its operating range; 2. When the wellhead power head floats up and down, the cantilever crane cannot avoid the wellhead working space; when the whole machine is transported, the cantilever crane cannot be retracted, which affects the transportation height and width of the whole machine; 3. When lifting the drilling tools at the wellhead, the position of the hoisted object and the front, back, left and right angles of the cantilever rope outlet generally deviate greatly, causing the limiting device at the rope outlet port of the pulley (to prevent the wire rope from slipping out of the groove) to be subjected to great force and wear, which can easily cause the wire rope to slip out of the groove and get stuck in the gap between the limiting device and the pulley, causing the wire rope to be stuck and unable to work.

[0004] Therefore, there is an urgent need for an auxiliary cantilever crane, a control method and a drilling rig for use on a mast, which have stronger construction capabilities and a larger construction range, as well as stronger adaptability. Summary of the invention

[0005] The purpose of the present invention is to provide an auxiliary cantilever crane, a control method and a drilling rig for use on a mast, aiming to solve the technical problems of a traditional cantilever crane, such as a limited operating range and an inability to avoid a power head and retract.

[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides an auxiliary cantilever crane for use on a mast, comprising a cantilever mechanism and a winch arranged on the mast at intervals in upper and lower directions, The cantilever mechanism includes a rotatable cylinder, a first pulley arranged on the upper part of the rotatable cylinder, and a retractable cantilever, the first pulley is arranged on the rotatable cylinder through a first pin shaft, and a part of the first pulley is located in the inner cavity of the rotatable cylinder, and the retractable cantilever is hinged to the rotatable cylinder through the first pin shaft; The cantilever mechanism also includes a pitch cylinder and a steel wire rope, wherein 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 rotating column; 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 thereof, passes through the first pulley, and is wound on the second pulley, and a sling is provided near the end of the second pulley.

[0007] As a further improvement of the above scheme, the rotatable column is vertically and rotatably arranged on the side of the mast through a mounting seat; preferably, the rotatable column is vertically and rotatably arranged on the side of the mast through an upper mounting seat and a lower mounting seat.

[0008] As a further improvement of the above solution, the rotatable cylinder is arranged on the mounting seat through a rotation drive device; The rotatable cylinder comprises a rotating cylinder and a rotating shaft arranged at one end of the rotating cylinder, and the other end of the rotating cylinder is connected to the rotating end of the rotating driving device; the rotating shaft is rotatably connected to the mounting seat.

[0009] As a further improvement of the above solution, the rotation drive device is a rotary drive device, preferably a worm gear type rotary drive device or a gear type rotary drive device; The rotating drum is connected to the slewing bearing of the slewing drive device.

[0010] As a further improvement of the above solution, the upper portion of the rotating drum is provided with an opening for the portion of the first pulley to extend into the inner cavity thereof; Rotating drum ears are respectively arranged on both sides of the opening, the first pin shaft is rotatably arranged on the two rotating drum ears, and the first pulley is located between the two rotating drum ears and is rotatably arranged on the first pin shaft.

[0011] As a further improvement of the above solution, the telescopic cantilever at least includes a main arm, a movable arm sleeved in the main arm, and a telescopic power arranged in the main arm for driving the movable arm to extend and retract; One end of the main arm is hinged to the rotatable cylinder through the first pin shaft, and the second pulley is arranged at the end of the movable arm away from the hinge; An articulated seat is provided at the bottom of the main arm, and the telescopic end of the pitch cylinder is hinged to the telescopic cantilever through the articulated seat.

[0012] As a further improvement of the above scheme, the telescopic power is a boom cylinder, and the rodless cavity end of the boom cylinder is connected to the main arm, and the rod cavity end is connected to the movable arm.

[0013] As a further improvement of the above solution, the second pulley is rotatably arranged at the end of the telescopic cantilever away from the first pulley through a pulley seat; The pulley seat comprises a seat body and two pulley support baffles arranged on the seat body, the two pulley support baffles are arranged on the seat body at intervals, and the second pulley is located between the two pulley support baffles; The pulley seat further comprises a rope blocking rod and a wear-resistant plate, wherein the rope blocking rod is arranged between the two pulley bracket baffles and is used to prevent the steel wire rope from escaping from the pulley groove of the second pulley; The wear-resistant plates are respectively arranged on the inner sides of the two pulley support baffles to fill the gap between the pulley support baffles and the second pulley.

[0014] As a further improvement of the above solution, a rope blocking sleeve is further provided outside the rope blocking rod, and a gap between the rope blocking sleeve and the edge of the second pulley is less than or equal to a preset distance.

[0015] As a further improvement of the above solution, the bottom of the rotatable cylinder is provided with an anti-wear structure to prevent the wire rope from wearing; The anti-wear structure comprises at least three anti-wear baffles, and the three anti-wear baffles are staggered to form a gap for the steel wire rope to pass through.

[0016] As a further improvement of the above solution, the anti-wear guard rod includes a guard rod body and a protective sleeve sleeved on the outer wall of the guard rod body.

[0017] As a further improvement of the above solution, the top of the rotatable column is rotatably arranged on the side of the mast through an upper mounting seat; the bottom of the rotatable column is rotatably arranged on the side of the mast through a lower mounting seat; The rotation driving device is arranged on the upper surface of the lower mounting seat, and the anti-wear structure is arranged on the lower surface of the lower mounting seat.

[0018] In a second aspect, the present invention further provides a control method for an auxiliary cantilever crane on a mast as provided in the first aspect, the steps comprising: During transportation, the telescopic boom is controlled to be retracted and in the shortest state, and the pitch cylinder is extended to control the telescopic boom 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, and at the same time adjusts the rotation angle of the rotatable column and the telescopic length of the telescopic boom to make the spreader consistent with the center of the wellhead; When the power head floats up and down, the rotation angle of the rotatable cylinder is adjusted so that the telescopic cantilever avoids the wellhead working space.

[0019] In a third aspect, the present invention further provides a drilling rig, comprising a drilling rig body and a mast arranged on the drilling rig body, wherein the mast is provided with the auxiliary cantilever crane used on the mast as provided in the first aspect.

[0020] Since the present invention adopts the above technical solution, the beneficial effects of this application are: The auxiliary cantilever crane provided by the present invention is used for a mast, wherein a rotatable cylinder, a retractable cantilever and a pitch cylinder are arranged on the cantilever mechanism, the retractable arm frame is hingedly connected to the rotatable cylinder, and the telescopic end of the pitch cylinder is hingedly connected to the retractable cantilever, and the telescopic end away from the telescopic end is hingedly connected to the lower part of the rotatable cylinder, so that the retractable cantilever can present different postures. Specifically, during transportation, the pitch cylinder extends out and drives the retractable cantilever to be parallel to the mast and close to the mast, thereby avoiding the problem of equipment being too high and too wide during transportation; combined with the arrangement of the rotatable cylinder, the rotatable cylinder can drive the retractable cantilever and the pitch cylinder to rotate within a certain angle range, thereby avoiding interference with the wellhead power head when the wellhead power head floats up and down, and only needs to rotate a certain angle to avoid the wellhead working space; In addition, the boom is a telescopic boom, that is, the length of the boom can be adjusted telescopically, and in combination with the pitch cylinder, the telescopic boom can be lifted to different angles, thereby increasing the working angle of the cantilever crane and the distance between the rope outlet and the center of the wellhead; combined with the setting of the rotatable cylinder, the rotatable cylinder can drive the telescopic cantilever and the pitch cylinder to rotate within a large angle range, thereby increasing the coverage angle of the suspension machine in the plane, that is, increasing the working range of the cantilever crane of the suspension machine, which can meet the needs of both 5T large lifting weight and short-distance lifting of objects and 1.2T long-distance lifting of objects; thereby improving the construction capacity, construction range, and adaptability of the auxiliary cantilever crane; Furthermore, in some preferred embodiments, the second pulley is arranged at the end away from the hinge of the arm support through a pulley seat, and a rope blocking rod and a rope blocking sleeve sleeved outside the rope blocking rod are arranged on the pulley seat; and a wear-resistant plate for filling the gap between the pulley bracket baffle and the second pulley is arranged on the inner side of the two pulley bracket baffles, so as to effectively prevent the steel wire rope from being out of the groove or stuck at the rope outlet pulley end; In certain preferred embodiments, an anti-wear structure is provided at the bottom of the rotatable column to prevent wear of the wire rope; the anti-wear structure includes at least three anti-wear baffle bars, and the three anti-wear baffle bars are staggered to form a gap for the wire rope to pass through; the setting of the anti-wear structure can effectively prevent wear and damage to the wire rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 The figure is a three-dimensional schematic diagram of an auxiliary cantilever crane for a mast disclosed in the present invention, which is arranged on the mast. Figure 1 (a) is a three-dimensional schematic diagram of the auxiliary cantilever crane in which the retractable cantilever is perpendicular to the mast when the auxiliary cantilever crane is working. Figure 1 (b) is a three-dimensional schematic diagram of the telescopic boom being parallel and close to the mast during the transportation of the auxiliary boom crane; Figure 2 It is a three-dimensional schematic diagram of an auxiliary cantilever crane used on a mast disclosed by the present invention; Figure 3 It is a side view schematic diagram of an auxiliary cantilever crane used on a mast disclosed by the present invention; Figure 4 for Figure 3 AA cross-sectional view of ; Figure 5 The present invention discloses a telescopic boom of an auxiliary boom crane on a mast, wherein Figure 5 (a) is a three-dimensional schematic diagram of the telescopic boom and the mast in parallel and close contact during transportation. Figure 5 (b) is a three-dimensional schematic diagram of the telescopic boom and the mast at a preset angle during operation, wherein Figure 5 (c) is a three-dimensional schematic diagram of the telescopic boom being perpendicular to the mast when in operation; Figure 6The figure is a schematic diagram of the working posture and working area of ​​an auxiliary cantilever crane on a mast disclosed by the present invention when lifting a weight of 5T, wherein Figure 6 (a) is a three-dimensional schematic diagram of the posture of the telescopic cantilever when lifting a weight of 5T. Figure 6 (b) is a schematic diagram of the working area when lifting a weight of 5 ton; Figure 7 The figure is a schematic diagram of the working posture and working area of ​​an auxiliary cantilever crane on a mast disclosed by the present invention when lifting a weight of 1.2T, wherein Figure 7 (a) is a three-dimensional schematic diagram of the posture of the telescopic cantilever 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; Figure 8 It is a three-dimensional schematic diagram of the second pulley disclosed in the present invention being arranged on a pulley seat; Fig. 9 It is a three-dimensional schematic diagram of the anti-wear structure disclosed in the present invention being arranged on a lower mounting seat.

[0023] Reference numerals: 01, cantilever mechanism; 11, rotatable cylinder; 111, rotating cylinder; 112, rotating shaft; 113, opening; 114, rotating cylinder support ear; 12. First pulley; 13. Telescopic cantilever; 131. Main arm; 132. Movable arm; 133. Telescopic power; 134. Articulated seat; 14. First pin; 15. Pitch cylinder; 16. Wire rope; 17. Second pulley; 18. Lifting device; 19. Upper mounting seat; 20. Lower mounting seat; 21. Rotation drive device; 22. Pulley seat; 221. Seat body; 222. Pulley bracket baffle; 223. Rope blocking rod; 224. Wear-resistant plate; 225. Rope blocking sleeve; 23. Anti-wear structure; 231. Anti-wear guard bar; 02. Winch; 03. Mast.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0028] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] Example 1

[0030] See also Figure 1-Figure 9 The present invention provides an auxiliary cantilever crane for a mast, comprising a cantilever mechanism 01 and a winch 02 arranged on a mast 03 at intervals. To facilitate lifting, the cantilever mechanism 01 is arranged on the upper side of the mast 03, and the winch 02 is correspondingly arranged below the cantilever mechanism 01; The cantilever mechanism 01 includes a rotatable barrel 111 column 11, a first pulley 12 arranged on the upper part of the rotatable barrel 111 column 11, and a retractable cantilever 13. The rotatable barrel 111 column 11 is vertically rotatably arranged on the side of the mast 03 through a mounting seat; the first pulley 12 is arranged on the rotatable barrel 111 column 11 through a first pin shaft 14, and a part of the first pulley 12 is located in the inner cavity of the rotatable barrel 111 column 11, and the retractable cantilever 13 is hinged to the rotatable barrel 111 column 11 through the first pin shaft 14; The cantilever mechanism 01 further comprises a pitch cylinder 15 and a steel wire rope 16, wherein the telescopic end of the pitch cylinder 15 is hinged to the telescopic cantilever 13, and the telescopic end away from the telescopic end is hinged to the lower part of the rotating cylinder 111 column; The telescopic boom 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 the wire rope 16 enters the inner cavity of the rotatable cylinder 111 column 11 from the bottom thereof, passes through the first pulley 12, and is wound on the second pulley 17, and a sling 18 is provided at the end close to the second pulley 17; The present invention provides a rotatable cylinder 111 column 11, a retractable boom 13 and a pitch cylinder 15 on the boom mechanism 01, the retractable boom is hinged to the rotatable cylinder 111 column 11, and the telescopic end of the pitch cylinder 15 is hinged to the retractable boom 13, and the telescopic end away from the telescopic end is hinged to the lower part of the rotating cylinder 111 column, so that the retractable boom 13 can present different postures. Specifically, when transporting, refer to Figure 1 (b), the pitch cylinder 15 extends and drives the telescopic boom 13 to be parallel to and close to the mast 03, thereby avoiding the problem of equipment being too high and too wide during transportation; when working, see Figure 1 (a) Figure 5 (b) and Figure 5 (c) the pitch cylinder 15 extends and drives the telescopic boom 13 to be perpendicular to the mast 03 or at a preset angle, so that the working angle of the boom crane and the distance between the rope outlet and the wellhead center can be adjusted to adapt to different working conditions; Combined with the setting of the rotatable cylinder 111 column 11, see Figure 6 and Figure 7 , so that the rotatable barrel 111 column 11 can drive the telescopic cantilever 13 and the pitch cylinder 15 to rotate within a certain angle range, so as to avoid interference with the wellhead power head when the wellhead power head floats up and down, and only needs to rotate a certain angle to avoid the wellhead working space; In addition, the boom is a telescopic boom, that is, the length of the boom can be adjusted telescopically, and in combination with the pitch cylinder 15, the telescopic boom can be lifted to different angles, thereby increasing the working angle of the cantilever crane and the distance between the rope outlet and the center of the wellhead; combined with the setting of the rotatable cylinder 111 column 11, the rotatable cylinder 111 column 11 can drive the telescopic cantilever 13 and the pitch cylinder 15 to rotate within a large angle range, thereby increasing the coverage angle of the suspension machine in the plane, that is, increasing the working range of the cantilever crane of the suspension machine, which can meet the needs of both 5T large lifting weight and short-distance lifting of objects and 1.2T long-distance lifting of objects; thereby improving the construction capacity, construction range, and adaptability of the auxiliary cantilever crane; See also Figure 6 In order to achieve 5T heavy lifting and short-distance lifting, the pitch cylinder 15 adjusts the cantilever crane posture. Specifically, the piston rod of the pitch cylinder 15 extends to drive the retractable cantilever 13 to rotate toward the top of the mast 03, and makes the axis of the retractable cantilever 13 and the axis of the rotatable cylinder 111 column 11 extend toward the top of the mast 03 at an angle of about 45°, and at the same time controls the retractable cantilever 13 to be in the shortest retracted state, such as Figure 6(a); at this time, the suspension radius is 2.14m, the vertical distance between the suspension point and the wellhead is 1.17m, and then the rotatable cylinder 111 column 11 is controlled to rotate, so as to achieve Figure 6 (b) The lifting of a 5T heavy load within the 240° coverage angle and range shown; See also Figure 7 To achieve 1.2T long-distance lifting, the pitch cylinder 15 adjusts the cantilever lifting posture. Specifically, the pitch cylinder 15 makes the axis of the retractable cantilever 13 and the axis of the rotatable cylinder 111 column 11 extend toward the top of the mast 03 at an angle of about 90°, and at the same time controls the retractable cantilever 13 to be in the longest extended state, such as Figure 7 (a); at this time, the suspension radius is 3.315m, the vertical distance between the suspension point and the wellhead is 2.455m, and then the rotatable cylinder 111 column 11 is controlled to rotate, so as to achieve Figure 7 (b) shows a 240° coverage angle and a 1.2T long-distance load within the range.

[0031] As a preferred embodiment, the rotatable cylinder 111 column 11 is vertically rotatably arranged on the side of the mast 03 through an upper mounting seat 19 and a lower mounting seat 20; The rotatable barrel 111 column 11 is arranged on the mounting seat by a rotation driving device 21; The rotatable drum 111 column 11 comprises a drum 111 and a rotating shaft 112 disposed at one end of the drum 111, and the other end of the drum 111 is connected to the rotating end of the rotating drive device 21; the rotating shaft 112 is rotatably connected to the upper mounting seat 19; Specifically, the upper mounting seat 19 includes a vertically arranged upper mounting plate and an upper horizontal plate arranged perpendicularly 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 a sleeve; the lower mounting seat 20 includes a vertically arranged lower mounting plate and a vertically arranged lower horizontal plate to the lower mounting plate, the lower horizontal plate is provided with a lower through hole matched with the rotating drive device 21; Preferably, the rotary drive device 21 is a slewing drive device, which is a worm gear type slewing drive device or a gear type slewing drive device; the rotating drum 111 is connected to the slewing support of the slewing drive device; In this embodiment, the rotary drive device 21 is a worm gear type rotary drive device, and 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.

[0032] As a preferred embodiment, the upper portion of the rotating drum 111 is provided with an opening 113 for allowing part of the first pulley 12 to extend into its inner cavity; The two sides of the opening 113 are respectively provided with drum ears 114, the first pin shaft 14 is rotatably arranged on the two drum ears 114, and the first pulley 12 is located between the two drum ears 114 and is rotatably arranged on the first pin shaft 14; With such an arrangement, the first pulley 12 is arranged on the rotating drum 111, and the first pin shaft 14 can be used as the hinge shaft 112 of the retractable cantilever 13, so that the cantilever crane mechanism is compact. While realizing that the retractable cantilever 13 can present a variety of postures, it can also ensure simple and effective winding of the wire rope 16, and avoid interference of the wire rope 16 during the posture switching of the retractable cantilever 13.

[0033] As a preferred embodiment, the retractable cantilever 13 at least includes a main arm 131, a movable arm 132 sleeved in the main arm 131, and a retractable power 133 arranged in the main arm 131 for pushing the movable arm 132 to retract; One end of the main arm 131 is hinged to the two rotating drum ears 114 on the rotatable drum 111 column 11 through the first pin shaft 14, and the second pulley 17 is arranged at the end of the movable arm 132 away from the hinge; An articulated seat 134 is provided at the bottom of the main arm 131, and the telescopic end of the pitch cylinder 15 is hinged to the telescopic cantilever 13 through the articulated seat 134; Preferably, the telescopic power 133 is an arm cylinder, and the rodless cavity end of the arm cylinder is connected to the main arm 131, and the rod cavity end is connected to the movable arm 132; Specifically, the main arm 131 includes two side plates arranged parallel to each other, a top plate arranged on the top of the two side plates, and a hinge seat 134 arranged on the bottom of the two side plates; the two side plates at the hinged end of the main arm 131 extend the main arm 131 support ears respectively, and the main arm 131 support ears are provided with main arm 131 hinge holes matching the first pin shaft 14, and the two main arm 131 support ears are respectively arranged on the outer sides of the rotating drum support ears 114; The inner cavity of the main arm 131 is also provided with a cylinder mounting seat for installing the arm cylinder, and a guide sleeve or guide plate for providing guidance for the movable arm 132; the movable arm 132 is provided with a connecting support for connecting the rod cavity end of the arm cylinder; with such a setting, controlling the arm cylinder can drive the extension and retraction of the movable arm 132.

[0034] As a preferred embodiment, see Figure 8 , the second pulley 17 is rotatably arranged at the end of the telescopic cantilever 13 away from the first pulley 12 through the pulley seat 22; The pulley seat 22 includes a seat body 221 and two pulley support baffles 222 arranged on the seat body 221, the two pulley support baffles 222 are arranged on the seat body 221 at intervals, and the second pulley 17 is located between the two pulley support baffles 222; The pulley seat 22 further 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 steel wire rope 16 from escaping from the pulley groove of the second pulley 17. The wear-resistant plates 224 are respectively arranged on the inner sides 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 sides of the pulley bracket baffles 222 by screws; with the arrangement of the wear-resistant plates 224, even if the wire rope 16 jumps out of the rope groove of the second pulley 17, since the gap has been filled by the wear-resistant plates 224, the wire rope 16 will not squeeze into the gap and jam the wire rope 16.

[0035] As a preferred embodiment, the rope blocking rod 223 is further provided with a rope blocking sleeve 225, 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; The setting of the rope blocking rod 223 can effectively prevent the steel wire rope 16 from being squeezed out of the rope groove of the second pulley 17. At the same time, a rope blocking sleeve 225 is also sleeved on the outside of the rope blocking rod 223. Even if the steel wire rope 16 is partially extruded and contacts the rope blocking sleeve 225, the steel wire rope 16 will not be worn; at the same time, a preset distance is also provided between the rope blocking sleeve 225 and the wheel edge of the second pulley 17. In the present embodiment, taking the steel wire rope 16 with a diameter of 16 mm as an example, it is necessary to adjust the gap between the rope blocking sleeve 225 and the wheel edge of the second pulley 17 to be less than or equal to 5 mm. Such a setting can effectively prevent the steel wire rope 16 from being squeezed out of the rope groove of the second pulley 17.

[0036] As a preferred embodiment, see Fig. 9 , the bottom of the rotatable cylinder 111 column 11 is provided with an anti-wear structure 23 for preventing the steel wire rope 16 from being worn; The anti-wear structure 23 includes at least three anti-wear blocking rods 231, and the three anti-wear blocking rods 231 are staggered to form a gap for the steel wire rope 16 to pass through; In this embodiment, four anti-wear blocking rods 231 are included, and the four anti-wear blocking rods 231 are arranged in a crisscross pattern to form a "well"-shaped gap; The anti-wear guard bar 231 includes a guard bar body and a protective sleeve sleeved on the outer wall of the guard bar body; Such an arrangement can effectively prevent the steel wire rope 16 from being worn when it is lowered from the drum 111 and pulled back and forth.

[0037] As a preferred embodiment, the top of the rotatable cylinder 111 column 11 is rotatably arranged on the side of the mast 03 through an upper mounting seat 19; the bottom of the rotatable cylinder 111 column 11 is rotatably arranged on the side of the mast 03 through a lower mounting seat 20; The rotation driving device 21 is disposed on the upper surface of the lower mounting seat 20 , and the anti-wear structure 23 is disposed on the lower surface of the lower mounting seat 20 .

[0038] Example 2

[0039] The present invention also provides a control method for an auxiliary cantilever crane on a mast as described in Example 1, the steps of which include: During transportation, the telescopic boom 13 is controlled to retract and be in the shortest state, and the pitch cylinder 15 is extended to control the telescopic boom 13 to be parallel to the mast 03 and close to the mast 03; During operation, the pitch cylinder 15 retracts and controls the telescopic boom 13 to form a suitable angle with the mast 03, and at the same time adjusts the rotation angle of the rotatable cylinder 111 column 11 and the telescopic length of the telescopic boom 13 to make the hanger 18 consistent with the center of the wellhead; When the power head floats up and down, the rotation angle of the rotatable cylinder 111 column 11 is adjusted so that the retractable cantilever 13 avoids the wellhead working space; With such an arrangement, during transportation, as long as the retractable arm is controlled to retract and be parallel to the mast 03 and close to the mast 03, the height and width of the equipment will not be increased, thus meeting the transportation requirements; during operation, the retractable cantilever 13 can be made to avoid the wellhead working space by rotating the rotatable cylinder 111 column 11, and will not interfere with the power head; at the same time, the retractable cantilever 13 can be made to form a suitable angle with the mast 03 by controlling the telescopic length of the retractable cantilever 13 and the pitch angle of the pitch cylinder 15; ensuring that the sling 18 is consistent with the center of the wellhead, even if the wellhead drilling tools are placed on both sides of the wellhead centerline or on the outside, the sling 18 can be adjusted to a position consistent with the wellhead center by rotating the rotatable cylinder 111 column 11, adjusting the telescopic amount of the retractable cantilever 13, and adjusting the pitch angle of the pitch cylinder 15, thereby improving the construction capacity, construction range, and adaptability of the auxiliary cantilever crane.

[0040] Example 3

[0041] The present invention also provides a drilling rig, including a drilling rig body and a mast 03 arranged on the drilling rig body, and the mast 03 is provided with an auxiliary cantilever crane used on the mast as described in Example 1; so that the drilling rig does not increase the height and width of the equipment additionally, and meets the transportation size limitation requirements; at the same time, it has a large operating range and can be adapted to various working conditions.

[0042] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An auxiliary cantilever crane for a mast, characterized in that: It includes a cantilever mechanism and a winch arranged on the mast at intervals above and below. The cantilever mechanism includes a rotatable cylinder, a first pulley arranged on the upper part of the rotatable cylinder, and a retractable cantilever, the first pulley is arranged on the rotatable cylinder through a first pin shaft, and a part of the first pulley is located in the inner cavity of the rotatable cylinder, and the retractable cantilever is hinged to the rotatable cylinder through the first pin shaft; The cantilever mechanism also includes a pitch cylinder and a steel wire rope, wherein 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 rotating column; 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 thereof, passes through the first pulley, and is wound on the second pulley, and a sling is provided near the end of the second pulley.

2. The auxiliary cantilever crane for use on a mast according to claim 1, characterized in that: The rotatable column is vertically rotatably arranged on the side of the mast through a mounting seat.

3. The auxiliary cantilever crane for use on a mast according to claim 2, characterized in that: The rotatable cylinder is arranged on the mounting seat via a rotation driving device; The rotatable cylinder comprises a rotating cylinder and a rotating shaft arranged at one end of the rotating cylinder, and the other end of the rotating cylinder is connected to the rotating end of the rotating driving device; the rotating shaft is rotatably connected to the mounting seat.

4. The auxiliary cantilever crane for use on a mast according to claim 3, characterized in that: The rotary drive device is a slewing drive device, which is a worm gear type slewing drive device or a gear type 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 to 4, characterized in that: The upper portion of the rotating drum is provided with an opening for the portion of the first pulley to extend into the inner cavity thereof; Rotating drum ears are respectively arranged on both sides of the opening, the first pin shaft is rotatably arranged on the two rotating drum ears, and the first pulley is located between the two rotating drum ears and is rotatably arranged on the first pin shaft.

6. An auxiliary cantilever crane for a mast according to any one of claims 1 to 4, characterized in that: The telescopic cantilever at least comprises a main arm, a movable arm sleeved in the main arm, and a telescopic power arranged in the main arm for driving the movable arm to extend and retract; One end of the main arm is hinged to the rotatable cylinder through the first pin shaft, and the second pulley is arranged at the end of the movable arm away from the hinge; An articulated seat is provided at the bottom of the main arm, and the telescopic end of the pitch cylinder is hinged to the telescopic cantilever through the articulated seat.

7. An auxiliary cantilever crane for a mast according to any one of claims 1 to 4, characterized in that: The second pulley is rotatably arranged at the end of the telescopic cantilever away from the first pulley through a pulley seat; The pulley seat comprises a seat body and two pulley support baffles arranged on the seat body, the two pulley support baffles are arranged on the seat body at intervals, and the second pulley is located between the two pulley support baffles; The pulley seat further comprises a rope blocking rod and a wear-resistant plate, wherein the rope blocking rod is arranged between the two pulley bracket baffles and is used to prevent the steel wire rope from escaping from the pulley groove of the second pulley; The wear-resistant plates are respectively arranged on the inner sides of the two pulley support baffles to fill the gap between the pulley support baffles and the second pulley.

8. An auxiliary cantilever crane for a mast according to any one of claims 1 to 4, characterized in that: The bottom of the rotatable cylinder is provided with an anti-wear structure to prevent the wire rope from wearing; The anti-wear structure comprises at least three anti-wear baffles, and the three anti-wear baffles are staggered to form a gap for the steel wire rope to pass through.

9. A control method for an auxiliary jib crane on a mast according to any one of claims 1 to 8, characterized in that: The steps include: During transportation, the telescopic boom is controlled to be retracted and in the shortest state, and the pitch cylinder is extended to control the telescopic boom 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, and at the same time adjusts the rotation angle of the rotatable column and the telescopic length of the telescopic boom to make the spreader consistent with the center of the wellhead; When the power head floats up and down, the rotation angle of the rotatable cylinder is adjusted so that the telescopic cantilever avoids the wellhead working space.

10. A drilling rig, characterized in that: It comprises a drilling rig body and a mast arranged on the drilling rig body, and the mast is provided with an auxiliary cantilever crane used on the mast as described in any one of claims 1-8.

Images