Movable automatic polishing tool for polishing blowout preventer steel ring groove

Abstract

The utility model relates to the field of blowout preventer surface treatment, in particular to a movable automatic polishing tool for polishing a blowout preventer steel ring groove, which comprises a supporting part, a positioning part, a lifting mechanism and a rotating mechanism, the positioning part is used for positioning between the supporting part and the blowout preventer steel ring groove, and the rotating mechanism is mounted on the lifting mechanism. The rotating mechanism comprises a rotating power part, a rotating telescopic assembly and a polishing assembly, the fixed end of the rotating telescopic assembly is in transmission with the power output end of the rotating power part, the rotating telescopic assembly is a telescopic end in the radial outward direction of the rotating plane, and the polishing assembly is detachably connected with the telescopic end. The problems that in the prior art, due to limitation of remote sites and high surface requirements, time and labor are consumed, or turnover time is long are solved.

Description

Technical Field

[0001] The utility model relates to the field of surface treatment of blowout preventers, and more particularly to a movable automatic polishing tool for grinding a steel ring groove of a blowout preventer. Background Art

[0002] In the prior art, blowout preventers (BOPs) are safety sealing wellhead devices commonly used in oil fields to prevent blowouts. During the long transportation process from the factory to the site, the steel ring groove used for surface sealing of the BOPs can develop some superficial problems, such as discoloration of the steel ring groove, surface indentations, and surface rust, requiring secondary processing before installation after arrival at the site.

[0003] The traditional secondary processing methods are manual grinding, which involves preliminary polishing with an angle grinder, and then grinding with fine sandpaper and oilstone. The other method is to find local processing equipment for processing.

[0004] Then in the actual processing process, the surface roughness of the steel ring groove after processing should be less than Ra0.8μm. The manual polishing method has many steps and is tedious, time-consuming and requires a high level of technical skills from the operator; the method of finding local processing equipment is restricted by the geographical environment, has a long turnover time, and may be subject to secondary bumps or rust during the turnover process.

[0005] Therefore, how to provide a new movable automatic polishing tool for grinding the blowout preventer steel ring groove, which is not restricted by the site and is suitable for processing a variety of steel ring groove diameters, is a problem that technical personnel in this field urgently need to solve. Utility Model Content

[0006] In view of this, the utility model provides a movable automatic polishing tool for grinding the steel ring groove of the blowout preventer, aiming to solve the above-mentioned technical problem of long time consumption caused by site limitations and manual grinding methods.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A movable automatic polishing tool for grinding the steel ring groove of a blowout preventer, comprising:

[0009] Support part;

[0010] a positioning portion, the positioning portion being mounted on the bottom of the support portion and used for positioning between the support portion and the blowout preventer body;

[0011] A lifting mechanism, comprising a lifting power unit, a transmission unit, and a lifting unit, wherein the lifting unit is connected to the support unit for sliding up and down, and the lifting power unit drives the lifting unit to slide up and down along the support unit through the transmission unit;

[0012] The rotating mechanism includes a rotating power unit, a rotating telescopic assembly and a polishing assembly. The rotating power unit is installed on the lifting unit; the fixed end of the rotating telescopic assembly is transmitted to the power output end of the rotating power unit and the radially outward direction along the rotating plane is the telescopic end, and the polishing assembly is detachably connected to the telescopic end.

[0013] Through the above technical solution, the utility model solves the problems of time-consuming and labor-intensive or long turnover time caused by the remoteness of the site and the high surface requirements. A positioning part is installed at the bottom of the structural support part, which can enable it to be processed based on the workpiece to be processed. While the rotating telescopic component is driven to rotate by the rotating power part, the telescopic end of the rotating telescopic component can be telescopically adjusted to adjust the radial length of the rotation, and the polishing component can be detachably connected to the telescopic end, so that it can adapt to the processing of various steel ring groove diameters.

[0014] Preferably, the supporting portion includes a lower flange, an upper flange and a slide rail, the lower flange and the upper flange are coaxially arranged, a plurality of the slide rails are parallel to the axis of the lower flange and are evenly arranged along the circumferential direction of the lower flange, and the ends of the plurality of slide rails along their length directions are respectively fixedly connected to the outer side walls of the lower flange and the upper flange, and the lifting portion is slidably connected to the slide rails.

[0015] Preferably, the transmission part includes a driving screw, a driven screw, a sprocket and a first chain, the driving screw and a plurality of driven screws are parallel to the slide rail and are evenly arranged along the circumferential direction of the lower flange, the lower end of the driving screw is transmission-connected to the power output end of the lifting power part, and the upper end of the driving screw is rotationally connected to the upper flange;

[0016] The ends of the plurality of driven screws are rotatably connected to the lower flange and the upper flange respectively, the plurality of sprockets are coaxially arranged with the active screw and the plurality of driven screws and are fixedly connected, and the center points of the plurality of sprockets are located in the same plane and between the lifting portion and the upper flange;

[0017] The first chain transmission sleeve is arranged on the outside of the plurality of sprockets to drive the plurality of driven screws to rotate synchronously; the driven screws and the active screws are in transmission connection with the lifting part to drive them to move up and down along the slide rail.

[0018] Preferably, the lifting part includes a middle flange, a slider and a power part mounting plate, the middle flange is coaxially arranged with the lower flange, the middle flange is provided with a plurality of threaded holes along its axial direction and is threadedly connected to the active screw and the plurality of driven screws, the slider is fixedly connected to the outer wall of the middle flange and is slidably connected to the slide rail, the power part mounting plate is fixed on the middle flange, and the rotating power part is mounted on the power part mounting plate.

[0019] Preferably, the positioning portion includes a centering component for centering the raised feature on the outside of the steel ring groove of the blowout preventer body, a magnetic seat and a centering synchronization component for adsorbing and positioning the installation surface of the blowout preventer body, multiple centering components are installed on the lower flange and are evenly arranged along the circumferential direction of the lower flange and have radial tightening ends to telescopically tighten the raised feature on the outside of the steel ring groove of the blowout preventer body; multiple magnetic seats are fixedly connected to the lower end surface of the lower flange and are evenly arranged along the circumferential direction of the lower flange, multiple magnetic seats and multiple centering components are staggered, and the centering synchronization component controls the synchronous movement of the radial telescopic ends of multiple centering components.

[0020] Preferably, the centering assembly includes a right-angle commutator, a screw rod, a support block and a radial tightening block, the first axial end of the right-angle commutator is arranged vertically on the rotation plane and is transmission-connected to the centering synchronization assembly; the screw rod is coaxially transmission-connected to the second axial end of the right-angle commutator along the radial direction of the rotation plane to drive the screw rod to rotate; the support block is fastened to the lower end face of the lower flange and the lower end face is provided with a slide groove along the radial direction of the lower flange, the radial tightening block is slidingly connected to the slide groove, and the radial tightening block is provided with a threaded hole transmission-connected to the screw rod and its inner end is the radial tightening end.

[0021] Preferably, the centering synchronization component includes a driving sprocket, a driven sprocket, a driving handwheel and a second chain, the center points of the driving sprocket and the multiple driven sprockets are located in the same plane, the driving sprocket and the multiple driven sprockets are coaxially arranged with the multiple first shaft ends and transmission connected, and the driving handwheel is coaxially arranged with the driving sprocket; the second chain transmission sleeve is arranged on the driving sprocket and the multiple driven sprockets to synchronously drive the multiple driven sprockets to rotate and then drive the multiple radial tightening blocks to simultaneously approach or move away from the center of the plane where they are located.

[0022] Preferably, the rotating telescopic assembly includes a rotating disk and a telescopic assembly, and the rotating disk is transmission-connected to the power output end of the rotating power unit; the telescopic assembly is in multiple groups, and the multiple groups of telescopic assemblies are all installed on the upper surface of the rotating disk and are symmetrically arranged relative to the center of the rotating disk, and their telescopic ends are arranged in opposite directions.

[0023] Preferably, the telescopic assembly includes a fixed frame, a rack, a knob, a fixed block and a telescopic block, the fixed frame is fastened to the upper surface of the rotating disk, the rack is slidably connected to the fixed frame along the chord length direction of the rotating disk, the knob is rotatably connected to the fixed frame along the axial direction of the rotating disk and meshes with the rack for transmission, the fixed block is fixed to the upper surface of the rotating disk, a sliding groove corresponding to the rack is provided on the upper surface of the fixed block, the telescopic block is slidably connected to the sliding groove, one end of the telescopic block is fixedly connected to the rack, and the polishing assembly is detachably connected to the telescopic block.

[0024] Preferably, the polishing assembly includes a connecting plate and a polishing sheet, the connecting plate is symmetrically fixed with mounting blocks on both sides along the length direction, the connecting plate has a clamping surface at a position between the two mounting blocks, the mounting block is arranged at an angle to the clamping surface, and the polishing sheet is firmly connected to the mounting block.

[0025] It can be seen from the above technical solution that, compared with the prior art, the present invention provides a movable automatic polishing tool for grinding the steel ring groove of a blowout preventer, which has the following beneficial effects:

[0026] 1. The whole system is installed based on the workpiece being processed, without being restricted by the site;

[0027] 2. The lifting part moves up and down through the active screw and multiple driven screws, and the up and down transmission is more stable;

[0028] 3. The positioning part is positioned by multiple centering components, which are synchronously driven by the second chain to ensure the accuracy of the positioning process. At the same time, multiple magnetic seats are also provided to achieve fixation with the workpiece;

[0029] 4. The telescopic components are symmetrically arranged on both sides of the rotating disk center, and the telescopic ends are arranged in opposite directions, so that the telescopic components can simultaneously process both sides of the inner wall of the steel ring groove during the rotation process. The telescopic end of the telescopic component is connected to a connecting plate, and mounting blocks are arranged on both sides of the connecting plate, so that one connecting plate can be installed with two polishing sheets. The mounting blocks are arranged at an angle to the clamping surface, which can better fit the inner side wall of the steel ring groove with a draft angle. The polishing sheets can be installed on both sides of the connecting plate. The two installation forms correspond to the opposite cutting angles of the two polishing sheets, and then correspond to the two side walls of the steel ring groove with opposite draft angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional schematic diagram of a movable automatic polishing tool for grinding the steel ring groove of a blowout preventer provided by the utility model;

[0031] Figure 2 A three-dimensional schematic diagram of the support portion provided by the utility model;

[0032] Figure 3 This is a schematic diagram of the assembly of the support portion and the lifting mechanism provided by the present invention;

[0033] Figure 4 A three-dimensional schematic diagram of the lifting mechanism provided by the utility model;

[0034] Figure 5 This is a schematic diagram of the assembly of the support portion and the positioning portion provided by the utility model;

[0035] Figure 6 A three-dimensional schematic diagram of the positioning portion provided by the utility model;

[0036] Figure 7 A three-dimensional schematic diagram of the centering assembly provided by the utility model;

[0037] Figure 8 A top view of the centering assembly provided by the present invention;

[0038] Figure 9 for Figure 8 AA cross-sectional view;

[0039] Figure 10 This is a schematic diagram of the assembly of the lifting part and the rotating mechanism provided by the utility model;

[0040] Figure 11 This is a schematic diagram of the assembly of the optional power unit and power extension assembly provided by the utility model;

[0041] Figure 12 A three-dimensional schematic diagram of the rotary telescopic assembly provided by the utility model;

[0042] Figure 13 A three-dimensional schematic diagram of the telescopic assembly provided by the utility model;

[0043] Figure 14 A three-dimensional schematic diagram of the tool holder provided by the utility model;

[0044] Figure 15 A three-dimensional schematic diagram of the polishing assembly provided by the utility model;

[0045] Figure 16 A three-dimensional schematic diagram of the connecting plate provided by the utility model;

[0046] Figure 17 This is a front view of the connecting plate provided by the utility model.

[0047] in:

[0048] 1-Support part, 2-Positioning part; 3-Lifting mechanism; 4-Rotation mechanism; 11-Lower flange; 12-Upper flange; 13-Slide rail; 21-Centering assembly; 22-Magnetic seat; 23-Centering synchronization assembly; 25-Support bolt; 31-Lifting power unit; 32-Transmission unit; 33-Lifting unit; 41-Rotation power unit; 42-Rotation telescopic assembly; 43-Polishing assembly; 44-Power extension assembly; 100-BOP body; 211-Right angle commutator; 212-Screw rod; 213-Support block; 214-Radial tightening block; 231-Drive sprocket; 232-Driven sprocket; 233-Drive handwheel; 234-Second chain; 235-Guide wheel; 321-Drive screw; 322-Driven screw; 3 23-sprocket; 324-first chain; 325-hydraulic rod; 331-middle flange; 332-slider; 333-power unit mounting plate; 421-rotating disk; 422-telescopic assembly; 431-connecting plate; 432-polishing sheet; 441-first flange; 442-second flange; 443-bolt fastener; 444-sleeve; 445-rotating shaft; 446-coupling; 2131-slide; 4221-fixed frame; 4222-rack; 4223-knob; 4224-fixed block; 4225-telescopic block; 4226-tool holder; 4227-tool holder body; 4228-clamping bolt; 4229-fixed part; 4230-clamping part; 4311-mounting block; 4312-clamping surface. DETAILED DESCRIPTION

[0049] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0050] See attached Figure 1 , the embodiment of the utility model discloses a movable automatic polishing tool for grinding the steel ring groove of the blowout preventer, comprising: a supporting part 1, a positioning part 2, a lifting mechanism 3 and a rotating mechanism 4;

[0051] The positioning part 2 is installed at the bottom of the support part 1 and is used for positioning between the support part 1 and the blowout preventer body 100;

[0052] The lifting mechanism 3 includes a lifting power unit 31, a transmission unit 32 and a lifting unit 33. The lifting unit 33 is connected to the support unit 1 for sliding up and down. The lifting power unit 31 drives the lifting unit 33 to slide up and down along the support unit 1 through the transmission unit 32.

[0053] The rotating mechanism 4 includes a rotating power unit 41, a rotating telescopic assembly 42 and a polishing assembly 43. The rotating power unit 41 is installed on the lifting unit 33; the fixed end of the rotating telescopic assembly 42 is transmitted to the power output end of the rotating power unit 41 and the direction radially outward along the rotating plane is the telescopic end, and the polishing assembly 43 is detachably connected to the telescopic end.

[0054] In this embodiment, the lifting power unit 31 is a speed reducer, and the rotating power unit 41 is a servo motor;

[0055] See attached Figure 2 The support portion 1 includes a lower flange 11, an upper flange 12, and slide rails 13. The lower flange 11 and the upper flange 12 are coaxially arranged. The multiple slide rails 13 are parallel to the axis of the lower flange 11 and are evenly arranged along the circumference of the lower flange 11. The multiple slide rails 13 are fixedly connected to the outer walls of the lower flange 11 and the upper flange 12 at both ends along their length. The lifting portion 33 is slidably connected to the slide rails 13. In this way, the lifting portion is connected to multiple slide rails at the same time, which makes it more stable during the lifting process.

[0056] In this embodiment, the lifting power unit 31 is installed on the upper surface of the lower flange, and its power output end is parallel to the axis of the lower flange 11 , and the power input end of the lifting power unit 31 faces the outside of the lower flange 11 .

[0057] See attached Figure 3-4 The transmission part 32 includes a driving screw 321, a driven screw 322, a sprocket 323 and a first chain 324. The driving screw 321 and multiple driven screws 322 are parallel to the slide rail 13 and are evenly arranged along the circumference of the lower flange 11. The lower end of the driving screw 321 is transmission-connected to the power output end of the lifting power part 31, and the upper end of the driving screw 321 is rotationally connected to the upper flange 12.

[0058] The ends of the multiple driven screws 322 are rotatably connected to the lower flange 11 and the upper flange 12 respectively. The multiple sprockets 323 are coaxially arranged and fixedly connected to the driving screw 321 and the multiple driven screws 322. The center points of the multiple sprockets 323 are located in the same plane and are located between the lifting portion and the upper flange 12.

[0059] The first chain 324 is driven around the outside of the multiple sprockets 323 to drive the multiple driven screws 322 to rotate synchronously. The driven screws 322 and the driving screw 321 are connected to the lifting unit 33 to drive them up and down along the slide rail 13. Thus, the lifting power unit provides power for the rotation of the driving screw. The driving screw and the multiple driven screws are fixedly connected to sprockets. The multiple sprockets are connected by the first chain to achieve synchronous transmission, thereby driving the driving screw and the multiple driven screws to rotate synchronously.

[0060] In this embodiment, the active screw 321 is rotatably connected to the upper flange 12 via a bearing, and the plurality of driven screws 322 are rotatably connected to the lower flange 11 and the upper flange 12 via bearings.

[0061] To further optimize the above technical solution, the lifting portion 33 may further include a middle flange 331, a slider 332, and a power unit mounting plate 333. The middle flange 331 is coaxially arranged with the lower flange 11. The middle flange 331 has multiple threaded holes along its axis and is threadedly connected to the active screw 321 and multiple driven screws 322. The slider 332 is fixedly connected to the outer wall of the middle flange 331 and is slidably connected to the slide rail 13. The power unit mounting plate 333 is fixed to the middle flange 331, and the rotating power unit 41 is mounted on the power unit mounting plate 333. As a result, a slider corresponding to the slide rail is arranged on the outer side of the middle flange, which improves the stability of the middle flange during the up and down sliding process and reduces the friction during the up and down sliding process. The threaded holes in the middle flange form a spiral connection with the active screw and multiple driven screws, so that the middle flange can drive the middle flange to move up and down during the rotation of the active screw and multiple driven screws, making the up and down transmission process more stable.

[0062] In this embodiment, a plurality of hydraulic rods 325 are further supported and connected between the lower flange 11 and the middle flange 331 , thereby making the lifting of the lifting portion 33 more labor-saving.

[0063] See attached Figure 5-9 The positioning portion 2 includes a centering assembly 21 for centering the raised feature on the outside of the steel ring groove of the BOP body 100, a magnetic base 22 for adsorbing and positioning the BOP body 100 on its mounting surface, and a centering synchronization assembly 23. Multiple centering assemblies 21 are mounted on the lower flange 11 and evenly arranged along the circumference of the lower flange 11. They have radially tightening ends that telescope and tighten against the raised feature on the outside of the steel ring groove of the BOP body 100. Multiple magnetic bases 22 are fixedly connected to the lower end surface of the lower flange 11 and evenly arranged along the circumference of the lower flange 11. The multiple magnetic bases 22 are staggered with the multiple centering assemblies 21. The centering synchronization assembly 23 controls the synchronous movement of the radially retractable ends of the multiple centering assemblies 21. Thus, the centering synchronization assembly controls the synchronous movement of the multiple centering assemblies to achieve positioning on the BOP body mounting surface. Furthermore, the magnetic bases further secure the BOP body to the BOP body based on the positioning.

[0064] In this embodiment, the positioning portion 2 further includes a support bolt 25, which is parallel to the axis of the lower flange 11 and is spirally connected to the lower flange 11. The support bolt 25 is supported between the lower flange and the surface of the blowout preventer, thereby reducing the load-bearing capacity of the magnetic base 22 and improving the service life of the magnetic base 22.

[0065] Specifically, the centering assembly 21 includes a right-angle commutator 211, a screw rod 212, a support block 213 and a radial tightening block 214. The first axial end of the right-angle commutator 211 is arranged vertically in the rotation plane and is transmission-connected to the centering synchronization assembly 23; the screw rod 212 is coaxially transmission-connected to the second axial end of the right-angle commutator 211 in the radial direction of the rotation plane to drive the screw rod 212 to rotate; the support block 213 is fastened to the lower end surface of the lower flange 11 and the lower end surface is provided with a slide groove 2131 along the radial direction of the lower flange 11, the radial tightening block 214 is slidingly connected to the slide groove 2131, and the radial tightening block 214 is provided with a threaded hole transmission-connected to the screw rod 212 and its inner end is a radial tightening end. Therefore, the right-angle commutator converts the transmission between multiple sprockets into the synchronous rotation of multiple screw rods, making operation easier. The radial tightening block is provided with threaded holes corresponding to the screw rods, realizing a spiral connection between the radial tightening block and the screw rods. The rotation of the screw rods drives the radial tightening block to slide in the radial direction of the lower end face of the lower flange, realizing the conversion of plane rotation into radial movement.

[0066] Specifically, the centering synchronization assembly 23 includes a driving sprocket 231, a driven sprocket 232, a driving handwheel 233, and a second chain 234. The center points of the driving sprocket 231 and the multiple driven sprockets 232 are located in the same plane. The driving sprocket 231 and the multiple driven sprockets 232 are coaxially arranged and transmission-connected with the multiple first shaft ends. The driving handwheel 233 is coaxially arranged with the driving sprocket 231. The second chain 234 is transmission-sleeved on the driving sprocket 231 and the multiple driven sprockets 232 to synchronously drive the multiple driven sprockets 232 to rotate, thereby driving the multiple radial clamping blocks 214 to simultaneously approach or move away from the center of the plane in which they are located. Thus, the driving handwheel provides power for the rotation of the driving sprocket. The driving sprocket and the multiple driven sprockets are connected by the second chain to achieve synchronous transmission, thereby driving the driving sprocket and the multiple driven sprockets to rotate synchronously, thereby improving the concentricity of the support portion 1 and the steel ring groove of the blowout preventer body 100.

[0067] In this embodiment, the centering synchronization component 23 also includes a guide wheel 235, and multiple guide wheels 235 are supported between the driving sprocket 231 and the driven sprocket 232 and between the two driven sprockets 232. The guide wheels 235 slide and abut against the inner side of the second chain 234. Thus, the guide wheels 235 can support the second chain 234 to avoid interference between the second chain 234 and the transmission part 32.

[0068] See attached Figure 10-14The rotating telescopic assembly 42 includes a rotating disk 421 and telescopic assemblies 422. The rotating disk 421 is in transmission connection with the power output end of the rotating power unit 41. The telescopic assemblies 422 are multiple groups, each of which is mounted on the upper surface of the rotating disk 421 and arranged symmetrically with respect to the center of the rotating disk 421, with their telescopic ends arranged in opposite directions. Thus, the telescopic assembly can adapt to the diameters of various steel ring grooves. The symmetrical arrangement of the telescopic assembly on the upper surface of the rotating disk and the symmetrical arrangement of the telescopic assembly with respect to the center of the rotating disk, with their telescopic ends arranged in opposite directions, allows the telescopic assembly to simultaneously process both sides of the inner wall of the steel ring groove during rotation.

[0069] In this embodiment, the rotating mechanism 4 also includes a power extension component 44, which includes a first flange 441, a second flange 442, a bolt fastening component 443, a sleeve 444, a rotating shaft 445 and a coupling 446. The first flange 441 is coaxially arranged with the middle flange 331 and is fastened to the power unit mounting plate 333. The second flange 442 is coaxially arranged with the first flange 441 and is located below the first flange 441. The first flange 441 and the second flange 442 are both provided with through holes at their axial positions. Multiple bolt fastening components 443 are parallel to each other. The plurality of bolt fastening assemblies 443 are respectively fastened to the first flange 441 and the second flange 442 at both ends along the length direction. The shaft sleeve 444 is coaxially arranged and fixedly connected to the through hole of the second flange 442. The rotating shaft 445 is rotatably connected to the interior of the shaft sleeve 444. One end of the rotating shaft 445 is fastened to the power output end of the rotating power unit via a coupling 446, and the other end is fastened to the spiral disk 421. The rotating power unit 41 is fastened to the first flange 441. Thus, the power extension assembly 44 compensates for the transmission instability caused by the increased transmission distance caused by the space occupied by some components between the middle flange 331 and the lower flange 11, provides support for the rotating shaft 445, and makes the rotating telescopic assembly 42 more stable during rotation.

[0070] Specifically, the telescopic assembly 422 may include a fixed frame 4221, a rack 4222, a knob 4223, a fixed block 4224 and a telescopic block 4225. The fixed frame 4221 is fastened to the upper surface of the rotating disk 421, the rack 4222 is slidingly connected to the fixed frame 4221 along the chord length direction of the rotating disk 421, the knob 4223 is rotatably connected to the fixed frame 4221 along the axial direction of the rotating disk 421 and engages with the rack 4222 for transmission, the fixed block 4224 is fixed to the upper surface of the rotating disk 421, and a sliding groove corresponding to the rack 4222 is provided on the upper surface of the fixed block 4224. The telescopic block 4225 is slidably connected to the sliding groove, one end of the telescopic block 4225 is fixedly connected to the rack 4222, and the polishing assembly 43 is detachably connected to the telescopic block 4225. Therefore, the mutually meshing knob and rack are installed on the fixed frame, and the rotation of the knob is converted into horizontal movement of the rack, which is more convenient to operate. The fixed block plays a limiting role in the sliding process of the telescopic block, making the sliding of the telescopic block more stable, and it will also be more stable during the force process.

[0071] In this embodiment, the telescopic assembly 422 can also include a tool holder 4226, which is fastened to the telescopic block 4225 with the other end of the rack 4222. The tool holder 4226 includes a tool holder body 4227 and a clamping bolt 4228. The tool holder body 4227 includes a fixing part 4229 and a clamping part 4230. The fixing part 4229 is fastened to the telescopic block 4225. The fixing part 4229 is provided with a long fixing hole along its length direction. The clamping part 4230 is provided with a clamping groove between the upper and lower surfaces along its thickness direction. The upper surface of the clamping part 4230 is provided with multiple threaded through holes. Multiple clamping bolts 4228 are spirally connected to the multiple threaded through holes. The polishing assembly 43 is detachably connected to the clamping part 4230. Thus, the polishing assembly 43 is placed in the clamping groove and fixed by being compressed by a plurality of clamping bolts 4228. The design of the plurality of clamping bolts 4228 ensures that the polishing assembly 43 is always fixed by the clamping bolts 4228 when adjusting different angles.

[0072] See attached Figure 15-17 The polishing assembly 43 includes a connecting plate 431 and a polishing sheet 432. Mounting blocks 4311 are symmetrically fixed on both sides of the connecting plate 431 along its length. The connecting plate 431 has a clamping surface 4312 located between the two mounting blocks 4311. The mounting blocks 4311 and the clamping surface 4312 are arranged at a 5-degree angle, and the polishing sheet 432 is securely connected to the mounting blocks 4311. Thus, mounting blocks are arranged on both sides of the connecting plate, allowing one connecting plate to be mounted with two polishing sheets. The mounting blocks are arranged at an angle to the clamping surface, allowing for better fit against the inner sidewall of the steel ring groove with a draft angle. The polishing sheet can be mounted on both sides of the connecting plate. The two mounting methods correspond to opposite bevel angles of the two polishing sheets, and thus to the two sidewalls of the steel ring groove with opposite draft angles.

[0073] In this embodiment, there are three main types of polishing pads to choose from, including ordinary bowl-shaped wire brushes, cloth grinding wheels, and wool wheels. The wire brush is responsible for rapid rust removal and is suitable for grooves with severe rust. The cloth grinding wheel is responsible for pre-polishing, and the wool wheel is responsible for polishing.

[0074] The specific principle and usage of the self-centering fixture provided in this embodiment are as follows:

[0075] 1. The ascending rotation mechanism 4 rotates the power input end of the elevating power unit 31 clockwise, driving the active screw 321 to rotate. The rotation of the sprocket 323 on the active screw 321 drives the other sprockets 323 driven by the first chain 324 to rotate synchronously, thereby driving the active screw 321 and the multiple driven screws 322 to rotate synchronously, thereby driving the elevating unit 33 spirally connected to the active screw 321 and the multiple driven screws 322 to rise, driving the rotating power unit 41 installed on the elevating unit 33 to rise, and driving the rotating mechanism 4 to rise;

[0076] 2. Centering: Hoist it on the installation surface of the blowout preventer. The centering component 21 is located around the raised feature on the outside of the steel ring groove of the blowout preventer body 100. Turn the driving handwheel 233, and the driving sprocket 231 rotates, driving the multiple driven sprockets 232 driven by it through the second chain 234 to rotate synchronously, thereby driving the first shaft ends of the multiple right-angle commutators 211 to rotate and drive their own second shaft ends to rotate, and then drive the radial tightening blocks 214 connected to the screw drive provided on the second shaft ends of the right-angle commutators 211 to press along the slide groove 2131 toward the center of the lower flange 11. After the multiple radial tightening blocks 214 are tightened against the raised features on the outside of the steel ring groove of the blowout preventer, centering is completed.

[0077] 3. Fixing: Open the magnetic seat 22 to adsorb the support part 1 on the installation surface of the blowout preventer body 100, and rotate the support bolt 25 to press it against the installation surface of the blowout preventer to complete the fixation.

[0078] 4. Lower the rotating mechanism 4 and rotate the power input end of the lifting power unit 31 counterclockwise. The specific transmission process is the same as step 1, driving the rotating mechanism 4 to descend;

[0079] 5. Assemble the polishing assembly 43. When the rotating mechanism 4 is lowered close to the mounting surface of the BOP body 100, the polishing pads 432 of the two sets of polishing assemblies 43 are respectively located on the front and back sides of the connecting plate 431 and are fastened to the mounting block 4311. During installation, the polishing pads 432 are both facing the outside of the lower flange 11.

[0080] 6. Pre-adjustment;

[0081] 6.1. Place the clamping surfaces 4312 of the two polishing assemblies 43 on the clamping portion 4230 of the tool holder body 4227 and preliminarily clamp them. Adjust the two polishing assemblies 43 so that the polishing pads 432 below them are visually located in the radial direction of the rotating disk 421. Manually rotate the rotating disk 421 to visually check whether the rotation trajectory of the polishing pads 432 coincides with the groove along the steel ring. Rotate and adjust the polishing pads 432 several times until the rotation trajectory of the polishing pads 432 coincides with the groove along the steel ring. Tighten the clamping bolts 4228 to complete the pre-adjustment.

[0082] 6.2. Adjust the rotary knob 4223, which is located on the telescopic assembly 422, with the polishing pad 432 and the connecting plate 431 tilted toward the inner side of the lower flange 11. Simultaneously, lower the rotating mechanism 4. The rack 4222, which engages with the knob 4223, pushes the telescopic block 4225 along the groove on the fixed block 4224. This in turn pushes the tool holder 4226, which in turn moves the polishing assembly 43, so that the polishing pad 432 is in contact with the outer wall of the steel ring groove.

[0083] 6.3. Adjust the rotation knob 4223, which is located on the telescopic assembly 422 of the polishing pad 432 and the connecting plate 431 in the tilted direction toward the outer side of the lower flange 11. The specific transmission process is consistent with 6.2, so that the polishing pad 432 is close to the inner wall of the steel ring groove;

[0084] 7. Trial processing, manually rotate the rotating disk 421 to ensure smooth rotation, and the polishing sheet 432 fits tightly with the inner and outer walls of the steel ring groove and the interference is uniform. If there is any interference, repeat step 6. If everything goes smoothly, start the rotating power unit 41 for processing.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A movable automatic polishing tool for grinding the steel ring groove of a blowout preventer, characterized in that: include: Support portion (1); A positioning portion (2), the positioning portion (2) being installed at the bottom of the support portion (1) and used for positioning between the support portion (1) and the blowout preventer body (100); A lifting mechanism (3), the lifting mechanism (3) comprising a lifting power unit (31), a transmission unit (32) and a lifting unit (33), the lifting unit (33) being connected to the support unit (1) in an up-and-down sliding manner, the lifting power unit (31) driving the lifting unit (33) to slide up and down along the support unit (1) via the transmission unit (32); A rotating mechanism (4) comprising a rotating power unit (41), a rotating telescopic assembly (42) and a polishing assembly (43); the rotating power unit (41) is mounted on the lifting unit (33); a fixed end of the rotating telescopic assembly (42) is in transmission with a power output end of the rotating power unit (41), and a direction radially outward along a rotating plane is a telescopic end; and the polishing assembly (43) is detachably connected to the telescopic end.

2. A movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 1, characterized in that: The support portion (1) includes a lower flange (11), an upper flange (12) and a slide rail (13); the lower flange (11) and the upper flange (12) are coaxially arranged; a plurality of the slide rails (13) are parallel to the axis of the lower flange (11) and are evenly arranged along the circumferential direction of the lower flange (11); the ends of the plurality of slide rails (13) along their length directions are respectively fixedly connected to the outer side walls of the lower flange (11) and the upper flange (12); and the lifting portion (33) is slidably connected to the slide rails (13).

3. The movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 2, characterized in that: The transmission part (32) includes a driving screw (321), a driven screw (322), a sprocket (323) and a first chain (324); the driving screw (321) and a plurality of driven screws (322) are parallel to the slide rail (13) and are evenly arranged along the circumferential direction of the lower flange (11); the lower end of the driving screw (321) is transmission-connected to the power output end of the lifting power part (31); and the upper end of the driving screw (321) is rotationally connected to the upper flange (12); Two ends of the plurality of driven screws (322) are rotatably connected to the lower flange (11) and the upper flange (12), respectively; the plurality of sprockets (323) are coaxially arranged with the active screw (321) and the plurality of driven screws (322) and fixedly connected; the center points of the plurality of sprockets (323) are located in the same plane and between the lifting portion (33) and the upper flange (12); The first chain (324) transmission sleeve is arranged on the outside of the plurality of sprockets (323) to drive the plurality of driven screws (322) to rotate synchronously; the driven screws (322) and the active screw (321) are transmission-connected to the lifting part (33) to drive them to move up and down along the slide rail (13).

4. A movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 3, characterized in that: The lifting portion (33) includes a middle flange (331), a slider (332) and a power unit mounting plate (333). The middle flange (331) is coaxially arranged with the lower flange (11). The middle flange (331) is provided with a plurality of threaded holes along its axial direction and is threadedly connected to the active screw (321) and the plurality of driven screws (322). The slider (332) is fixedly connected to the outer wall of the middle flange (331) and is slidably connected to the slide rail (13). The power unit mounting plate (333) is fixed to the middle flange (331). The rotating power unit (41) is mounted on the power unit mounting plate (333).

5. The movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 3, characterized in that: The positioning portion (2) includes a centering component (21) for centering the raised feature on the outer side of the steel ring groove of the blowout preventer body (100), a magnetic seat (22) for adsorbing and positioning the installation surface of the blowout preventer body (100), and a centering synchronization component (23). A plurality of the centering components (21) are installed on the lower flange (11) and are evenly arranged along the circumferential direction of the lower flange (11). The plurality of the magnetic seats (22) are fixedly connected to the lower end surface of the lower flange (11) and are evenly arranged along the circumferential direction of the lower flange (11). The plurality of the magnetic seats (22) and the plurality of the centering components (21) are staggered. The centering synchronization component (23) controls the synchronous movement of the radial telescopic ends of the plurality of the centering components (21).

6. A movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 5, characterized in that: The centering assembly (21) includes a right-angle commutator (211), a screw rod (212), a support block (213) and a radial tightening block (214); the first axial end of the right-angle commutator (211) is arranged perpendicular to the rotation plane and is transmission-connected to the centering synchronization assembly (23); the screw rod (212) is coaxially transmission-connected to the second axial end of the right-angle commutator (211) in the radial direction of the rotation plane to drive the screw rod (212) to rotate; the support block (213) is fastened to the lower end surface of the lower flange (11) and the lower end surface is provided with a slide groove (2131) in the radial direction of the lower flange (11); the radial tightening block (214) is slidingly connected to the slide groove (2131); a threaded hole is provided on the radial tightening block (214) for transmission connection with the screw rod (212), and its inner end is the radial tightening end.

7. A movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 6, characterized in that: The centering synchronization component (23) includes a driving sprocket (231), a driven sprocket (232), a driving handwheel (233) and a second chain (234). The center points of the driving sprocket (231) and the plurality of driven sprockets (232) are located in the same plane. The driving sprocket (231) and the plurality of driven sprockets (232) are coaxially arranged with the plurality of first shaft ends and are transmission-connected. The driving handwheel (233) is coaxially arranged with the driving sprocket (231). The second chain (234) is transmission-sleeved on the driving sprocket (231) and the plurality of driven sprockets (232) to synchronously drive the plurality of driven sprockets (232) to rotate, thereby driving the plurality of radial tightening blocks (214) to simultaneously approach or move away from the center of the plane where they are located.

8. The movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 1, characterized in that: The rotating telescopic assembly (42) comprises a rotating disk (421) and a telescopic assembly (422), wherein the rotating disk (421) is in transmission connection with the power output end of the rotating power unit (41); the telescopic assembly (422) is composed of multiple groups, and the multiple groups of telescopic assemblies (422) are all mounted on the upper surface of the rotating disk (421) and arranged symmetrically relative to the center of the rotating disk (421), and their telescopic ends are arranged in opposite directions.

9. The movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 8, characterized in that: The telescopic assembly (422) comprises a fixed frame (4221), a rack (4222), a knob (4223), a fixed block (4224) and a telescopic block (4225). The fixed frame (4221) is fastened to the upper surface of the rotating disk (421). The rack (4222) is slidably connected to the fixed frame (4221) along the chord length direction of the rotating disk (421). The knob (4223) is rotatably connected to the fixed frame (4221) along the axial direction of the rotating disk (421). The fixed block (4224) is fixed on the upper surface of the rotating disk (421) and meshes with the rack (4222). The upper surface of the fixed block (4224) is provided with a sliding groove corresponding to the rack (4222). The telescopic block (4225) is slidably connected to the sliding groove. One end of the telescopic block (4225) is fixedly connected to the rack (4222). The polishing assembly (43) is detachably connected to the telescopic block (4225).

10. The movable automatic polishing tool for grinding the steel ring groove of a blowout preventer according to claim 1, characterized in that: The polishing assembly (43) comprises a connecting plate (431) and a polishing sheet (432); the connecting plate (431) is symmetrically fixed with mounting blocks (4311) on both sides along the length direction; the connecting plate (431) has a clamping surface (4312) located between the two mounting blocks (4311); the mounting block (4311) and the clamping surface (4312) are arranged at a 5-degree angle; and the polishing sheet (432) is firmly connected to the mounting block (4311).

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