A controllable front-mixing abrasive jet cutting device

Abstract

The present application relates to the field of oil and gas, and discloses a controllable front-mixing abrasive jet cutting device, which is composed of an abrasive transportation module, an anchoring module and a nozzle telescopic module.The abrasive transportation module has the functions of storing, mixing and transporting abrasives, and solves the problems of uneven mixing on the ground, long transportation pipeline and uncontrollable mixing of conventional abrasive jet cutting devices.The anchoring module uses a ball screw nut structure, and is more controllable, accurate and wide-ranging than a traditional hydraulic anchor.The nozzle telescopic module realizes stepless adjustment of the target distance of the nozzle by controlling the extension and retraction of the piston rod of the hydraulic cylinder, and effectively improves the abrasive jet cutting efficiency compared with the nozzle with fixed or step-adjusted target distance.The present application is a mechatronic device, and the rotation speed, forward and reverse rotation of the motors of each module and the piston stroke of the hydraulic cylinder are controlled by a computer instruction, so that the degree of autonomy is high, efficient and safe cutting can be carried out from the inside of the casing, and the present application is suitable for casing sticking release and abandoned casing cutting.

Description

Technical Field

[0001] This invention relates to a downhole casing cutting device, and more specifically, to a controllable premixed abrasive jet cutting device. Background Technology

[0002] As the oil and gas industry moves into deeper formations, drilling becomes more difficult, increasing the likelihood of casing getting stuck. Casing cutting technology, as an effective way to get out of stuck casing, is widely used.

[0003] In the later stages of oil and gas development, the number of decommissioned wells increases dramatically. It is estimated that by 2028, approximately 30,000 wells worldwide will be decommissioned. Casing cutting and recycling is the final and most critical step in the well decommissioning process.

[0004] Currently, many technical problems of traditional downhole cutting technology in platform cutting operations still cannot be effectively solved. Mechanical cutting suffers from severe tool wear, low success rate, and difficulty in application to highly deviated wells and horizontal wells. Condensed beam cutting produces poor cut quality and easily pollutes the environment. The chemical agent bromide trifluoride (BrF3) used in chemical cutting is highly corrosive and is a highly toxic substance. In contrast, abrasive jet cutting, as a safe, efficient, and pollution-free cutting method, has good application and development prospects.

[0005] In abrasive jet cutting, there are two mixing methods for abrasives: pre-mixing and post-mixing. When cutting a sleeve of the same thickness, the pressure required for pre-mixing is 1 / 7 to 1 / 10 of that for post-mixing. Therefore, this invention adopts the pre-mixing method. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing abrasive jet cutting technology and to invent a controllable premixed abrasive jet cutting device that integrates abrasive storage and transportation, anchoring, and nozzle extension and retraction. This device integrates electromechanical and hydraulic systems, has a high degree of autonomy, and can precisely control the movement of each module through computer commands to complete the cutting of the sleeve.

[0007] The objective of this invention is achieved through the following technical solutions.

[0008] The present invention provides a controllable premixed abrasive jet cutting device, comprising an abrasive transport module, an anchoring module, and a nozzle telescopic module, the three modules working together to complete the cutting of the sleeve.

[0009] The top cover of the abrasive transport module is equipped with lifting lugs for lowering and lifting the device.

[0010] The abrasive transport module mainly consists of an abrasive tank and an abrasive mixing chamber. The abrasive tank is used to store dry abrasive. Without disassembling the device, abrasive can be replenished through the abrasive filling port on the abrasive tank. The dry abrasive is transported by three circumferential screws. To reduce the probability of abrasive blockage during transport, all three circumferential screws are set to transport simultaneously. Even if one of the circumferential screws is blocked, the abrasive can still be transported normally. The amount of dry abrasive transported is controlled by the speed of the abrasive motor, and the two are directly proportional.

[0011] The abrasive container of the abrasive transport module is annular in shape, with grooves designed for pipeline layout. The lugs on the container mate with grooves on the split outer shell of the abrasive transport module, thereby achieving the installation and positioning of the abrasive container.

[0012] The abrasive transport module has a circumferential copper sleeve mounting port at the bottom of the abrasive tank and a central copper sleeve interface at the outlet of the abrasive mixing chamber. The copper sleeve provides support and protection for the screw and also effectively protects the inner walls of the bottom outlet of the abrasive tank and the outlet of the abrasive mixing chamber.

[0013] The abrasive mixing chamber of the abrasive transport module, under the action of the central screw, initially mixes the dry abrasive transported by the circumferential screw with a water jet under certain pressure to form an abrasive slurry, and then transports it to the abrasive slurry inlet of the nozzle telescopic module through the outlet of the abrasive mixing chamber. The concentration of the abrasive slurry is determined by the mass of the transported dry abrasive and the mass of the incoming water jet.

[0014] The gear mounting box of the abrasive transport module is equipped with a circumferential bearing and a central bearing, which support and protect the screw, ensuring its normal rotation. Two symmetrical lugs are provided on the circumference of the gear mounting box for installation and positioning.

[0015] The gear cover, gear mounting box, abrasive jar, and abrasive mixing chamber of the abrasive transport module are all designed with lugs in a symmetrical direction for installation and positioning with the split shell of the abrasive transport module. Threaded holes are machined on the lugs. The gear cover and gear mounting box are connected by screws, the gear mounting box and abrasive jar are connected by screws, and the abrasive jar and abrasive mixing chamber are connected by bolts.

[0016] The abrasive transport module has its top cover and the mounting flange of the abrasive motor connected by tapered threads, while the split outer shell and the mounting flange of the abrasive motor are connected by screws.

[0017] The anchoring module mainly consists of a ball screw nut, a bottom support for the screw, an anchoring housing, two short connecting rod mounting seats, six short connecting rods, three long connecting rods, and six anchoring slips.

[0018] The ball screw nut of the anchoring module is a round flange nut, and the outer diameter of the short connecting rod mounting base is the same as the outer diameter of the round flange nut. The two are fastened together by bolts, which is compact and extremely suitable for devices with limited space.

[0019] The bottom support of the anchoring module's lead screw is equipped with a pair of angular contact ball bearings for supporting the lower part of the lead screw.

[0020] The anchoring module has an anchoring housing with a pair of angular contact ball bearings on its upper part for supporting the upper part of the lead screw. The upper part of the anchoring housing has six threaded holes for screw fastening to the abrasive housing. The middle part has three rectangular slots for the connecting rod to be pushed out. The lower part has six through holes for screw fastening to the bottom support of the lead screw.

[0021] The short connecting rod of the anchoring module has a curved shape, which effectively solves the problem of dead points in motion when the connecting rod is extended.

[0022] The short connecting rod mounting base of the anchoring module has three circumferential lugs for hinged connection with the short connecting rod, and protrusions are provided on the lugs for overtravel protection to ensure normal extension and retraction of the connecting rod.

[0023] The long connecting rod of the anchoring module has grooves at both ends for hinge with the short connecting rod, and the groove at the upper part is for installing the anchoring clip.

[0024] The anchoring slips of the anchoring module have their teeth arcs designed according to the inner diameter of the sleeve to be cut, ensuring the effectiveness of the anchoring.

[0025] The nozzle telescopic module consists of a nozzle rotating seat, four telescopic connecting rods, a hydraulic cylinder, an upper part of the nozzle mounting seat, a lower part of the nozzle mounting seat, and a nozzle.

[0026] The nozzle telescopic module's nozzle rotating seat has an upper boss that mates with the bearing's inner diameter, a central recess for wiring, and a lower lug for mounting the connecting rod and hydraulic cylinder.

[0027] The four telescopic connecting rods of the nozzle telescopic module are hinged at their upper ends to the lugs on the lower part of the nozzle rotating seat, hinged at their lower ends to the upper part of the nozzle mounting seat, and hinged in the middle to the piston rod of the hydraulic cylinder via a pin.

[0028] The nozzle mounting base of the nozzle telescopic module consists of two parts, upper and lower. The lower part has a high-pressure abrasive jet passing through it, which causes great wear. The two parts are connected by bolts, making them easy to replace.

[0029] The nozzle telescopic module has a high-pressure water inlet at the front end of the lower part of the nozzle mounting base, and an inlet for the abrasive slurry from the abrasive transport module on the upper side. The high-pressure water provides secondary acceleration to the abrasive in the abrasive slurry within the mixing chamber. The nozzle mounting interface at the rear end is threadedly connected to the nozzle.

[0030] The nozzle telescopic module is provided with an outer shell to protect the internal connecting rod, nozzle, upper part of nozzle mounting base and lower part of nozzle mounting base and other parts. Furthermore, a nozzle mounting base protective shell is provided to protect the nozzle mounting base and nozzle and other internal parts.

[0031] The nozzle telescopic module prevents the nozzle from directly colliding with the sleeve wall during the nozzle extension process by installing anti-collision wheels on the upper part of the nozzle mounting base. Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0032] (1) The present invention innovatively proposes to carry out abrasive premixing inside the abrasive jet cutting device. Conventional abrasive premixing is carried out on the ground, with long transport pipelines, large wear, cumbersome mixing process and no control. The method proposed in the present invention can effectively solve the above problems.

[0033] (2) The present invention uses a screw for dry abrasive transport. Compared with the transport method by gravity and pressure difference, the screw transport has high accuracy and the transport volume can be controlled by the screw speed.

[0034] (3) The present invention achieves the anchoring of the device through a ball screw nut mechanism, which makes the anchoring range more controllable than hydraulic anchoring, because it is difficult to stabilize the liquid pressure when using hydraulic anchoring.

[0035] (4) The present invention designs a dead point prevention structure and an overtravel protection structure in the anchoring module, specifically a bent and straight short connecting rod and a protrusion on the lug of the short connecting rod mounting seat. The bent and straight short connecting rod can ensure that the connecting rod is pushed out smoothly and overcome the dead point, while the protrusion can prevent the connecting rod from pushing out too much and failing to retract, and can also protect the connecting rod.

[0036] (5) The present invention uses a hydraulic cylinder and a linkage mechanism to realize the nozzle extension and retraction, which is suitable for a wide range of pipe diameters, simple to control the target distance, and can be steplessly adjusted, effectively solving the problem that the nozzle target distance is fixed or can only be adjusted in stages when the traditional abrasive jet device cuts the sleeve.

[0037] (6) This invention completes the cutting of the sleeve by programming and controlling the speed, forward and reverse rotation of the drive motor of each module and the stroke of the hydraulic cylinder piston. It has a high degree of autonomy and requires little manual intervention. Attached Figure Description

[0038] Figure 1 This is the overall assembly drawing of the present invention.

[0039] Figure 2 This is an exploded view of the abrasive transport module assembly.

[0040] Figure 3 This is a cross-sectional view of the abrasive transport module assembly.

[0041] Figure 4 This is an assembly drawing of the gear mounting box, gears, and bearings for the abrasive transport module.

[0042] Figure 5 This is a drawing of the abrasive tank part of the abrasive transport module.

[0043] Figure 6 This is a part drawing of the abrasive mixing chamber of the abrasive transport module.

[0044] Figure 7 This is a diagram of the split-type outer shell of the abrasive transport module.

[0045] Figure 8 This is an exploded view of the anchoring module assembly.

[0046] Figure 9 This is a sectional view of the anchoring module assembly.

[0047] Figure 10 This is a drawing of the short connecting rod mounting bracket for the anchoring module.

[0048] Figure 11 This is an exploded view of the nozzle telescopic module assembly.

[0049] Figure 12 This is a cross-sectional view of the nozzle telescopic module assembly.

[0050] Figure 13 This is a part drawing of the nozzle rotating seat of the nozzle telescopic module.

[0051] Figure 14 This is a drawing of the lower part of the nozzle mounting base of the nozzle telescopic module. Detailed Implementation

[0052] The present invention will now be further described with reference to the accompanying drawings.

[0053] A controllable premixed abrasive jet cutting device is characterized by including an abrasive transport module, an anchoring module, and a nozzle telescopic module.

[0054] The abrasive transport module has three lifting lugs 1-1 circumferentially arranged on the upper end of its top cover for lowering and lifting the device of the present invention.

[0055] The abrasive transport module 1, driven by the abrasive motor 1-3 mounted on the flange 1-4, transmits motion to the central screw 1-13 via the coupling 1-5. Since the central gear 1-16 is connected to the central screw by a key, the central gear meshes with three circumferential gears 1-8, thereby driving the circumferential screw 1-14 to rotate. The circumferential screw uses its spiral grooves to transport the abrasive stored in the abrasive tank to the abrasive mixing chamber. The non-standard design of the spiral grooves ensures that the abrasive will not leak out from the spiral grooves when the circumferential screw is not rotating. The abrasive will only be transported normally when the circumferential screw rotates.

[0056] The abrasive transport module 1 is designed with gear covers 1-6 to protect the gear set, and three circumferential thrust ball bearings 1-18 and one central thrust ball bearing 1-17 are installed in the gear mounting box. On the one hand, they support the screw and bear the load, and on the other hand, they convert the sliding friction of the screw during rotation into rolling friction, thereby reducing rotational resistance.

[0057] The abrasive transport module 1 has an abrasive tank 1-9 in a grooved ring shape, which provides a large storage space for abrasive. The hollow shaft section 1-9-2 in the middle serves as the channel for the central screw 1-13, and the groove 1-9-1 on it serves as the pipeline channel. The three abrasive outlets 1-9-3 to 1-9-5 at the bottom are connected to three circumferential copper sleeves 1-10. The design of the circumferential copper sleeves avoids direct contact and wear between the circumferential screw and the wall of the abrasive tank. Abrasive filling ports 1-9-10 are provided on the sides of the abrasive tank lugs 1-9-6 to 1-9-7, allowing abrasive to be added without disassembling the device.

[0058] The abrasive transport module 1 has a water jet interface 1-12-1 on the side of the abrasive mixing chamber 1-12. Under the rotation of the central screw 1-13, the dry abrasive and water are uniformly mixed into an abrasive slurry, which flows from the abrasive mixing chamber outlet 1-12-2 to the abrasive slurry inlet 3-13-1 of the lower part 3-13 of the nozzle mounting seat of the nozzle telescopic module 3. The abrasive mixing chamber outlet is threaded with a central copper sleeve 1-11, which serves the same purpose as the circumferential copper sleeve 1-10. The groove 1-12-3 designed on the side of the abrasive mixing chamber serves the same purpose as the groove 1-9-1 on the abrasive tank 1-9, and is used for pipeline routing.

[0059] The gear mounting box 1-7 of the abrasive transport module 1 is equipped with three circumferential bearings 1-18 and a central bearing 1-17, which support and protect the screw and ensure its normal rotation. Two symmetrical lugs 1-7-1 to 1-7-2 are provided in the circumferential direction for installation and positioning.

[0060] The gear cover 1-6, gear mounting box 1-7, abrasive tank 1-9, and abrasive mixing chamber 1-12 of the abrasive transport module 1 are all designed with lugs in a symmetrical direction and threaded holes are machined on the lugs. The gear cover and gear mounting box are connected by screws, the gear mounting box and abrasive tank are connected by screws, and the abrasive tank and abrasive mixing chamber are connected by bolts.

[0061] The abrasive transport module 1 is designed with a split mounting shell 1-15 to facilitate the installation and disassembly of components. Grooves are provided on the shells, and the grooves on the split mounting shell 1-15 cooperate with the lugs of the gear cover 1-6, the gear mounting box 1-7, the abrasive tank 1-9, and the abrasive mixing chamber 1-12 to achieve circumferential and axial fixation of the gear cover, gear mounting box, abrasive tank, and abrasive mixing chamber.

[0062] The movement principle of the abrasive module 2 is as follows: the abrasive motor 1-3, installed on the abrasive motor flange 1-4, is rotated by computer commands. The motion is transmitted to the central screw 1-13 through the coupling 1-5. The central gear 1-16 is keyed to the central screw. Three circumferential gears 1-8 mesh with the central gear. The three circumferential screws 1-14 are keyed to the corresponding three circumferential gears. When the central screw rotates, the circumferential screws rotate together under the meshing action of the gears. The circumferential screws use their spiral grooves to transport dry abrasive from the abrasive tank 1-9 to the abrasive mixing chamber 1-12. The central screw mixes the water jet entering from the side inlet 1-12-1 of the abrasive mixing chamber with the dry abrasive to form an abrasive slurry. The abrasive slurry is transported from the abrasive mixing chamber outlet 1-12-2 through the abrasive jet pipe to the abrasive slurry inlet 3-13-1 of the nozzle mounting base of the nozzle telescopic module 3.

[0063] The anchoring module 2 mainly consists of a ball screw 2-14, a screw nut 2-7, a screw bottom support 2-12, an anchoring housing 2-13, two short connecting rod mounting seats 2-8, six short connecting rods 2-9, three long connecting rods 2-10, and six anchoring clips 2-11.

[0064] The anchoring module 2, driven by the anchoring motor 2-2 installed on the anchoring motor flange 2-3, rotates through the coupling 2-4, the ball screw 2-14 rotates, and the screw nut 2-7 moves linearly. The first short connecting rod mounting seat 2-8 is fixed to the screw nut 2-7 with screws. The first short connecting rod mounting seat is provided with 3 lugs in the circumference. One end of the short connecting rod 2-9 is hinged to it through a pin, and the other end of the short connecting rod is hinged to the grooves at both ends of the long connecting rod 2-10 through a pin.

[0065] The lead screw nut of the anchoring module 2 is a round flange nut, which is connected to the first short connecting rod mounting seat 2-8 by screws. The structure is compact and is very suitable for devices with limited space.

[0066] The anchoring module 2 has a ball screw 2-14 mounted on a bottom support 2-12. The upper part of the bottom support is fixed to the second short connecting rod mounting seat 2-8 by screws, and the circumferential part is fixed to the anchoring housing 2-13 by screws. One end of the short connecting rod 2-9 is hinged to the second short connecting rod mounting seat by a pin, and the other end is hinged to the two end grooves of the long connecting rod 2-10.

[0067] The anchoring module 2 has grooves at both ends of the long connecting rod 2-10 for hinge connection with the short connecting rod 2-9. The upper groove and boss are used to install the anchoring clip 2-11. The two are connected by screws. The anchoring clips are arranged at both ends of the long connecting rod, which effectively improves the anchoring success rate.

[0068] The anchoring module 2 has a pair of angular contact ball bearings 2-6 installed on the bottom support 2-12 of the ball screw for supporting the lower part of the ball screw 2-14. A pair of angular contact ball bearings 2-6 are installed on the upper part of the anchoring housing 2-13 for supporting the upper part of the ball screw. At the same time, the upper part of the anchoring housing has 6 threaded holes in the circumferential direction for fixing with the abrasive housing 1-15. The middle part has 3 rectangular slots in the circumferential direction for the extension of the connecting rod. The lower part has 6 through holes in the circumferential direction for screw fixing between the anchoring housing and the bottom support of the ball screw.

[0069] The short connecting rod of the anchoring module 2 has a curved shape, which effectively solves the problem of dead point when the connecting rod is extended.

[0070] The short connecting rod mounting base 2-8 of the anchoring module 2 has three circumferential lugs 2-8-1 that are hinged to the short connecting rod 2-9 through through holes 2-8-3. A protrusion 2-8-2 is provided on the lugs for overtravel protection to ensure normal extension and retraction of the connecting rod.

[0071] The anchoring slips 2-11 of the anchoring module 2 have their tooth curvature designed according to the inner diameter of the sleeve to be cut, ensuring the effectiveness of the anchoring.

[0072] The anchoring module 2 uses a split housing 2-5 to install the coupling 2-4.

[0073] The anchoring module 2 is provided with a connecting section 2-1 that is screwed to the abrasive housing 1-15 of the abrasive module 1.

[0074] During the movement of the anchoring module 2, the computer command starts the anchoring motor 2-2 to rotate forward, driving the ball screw 2-14 to rotate through the coupling 2-4. The screw nut 2-7 moves downward. Because the first short connecting rod mounting seat 2-8 is fixed to the screw nut with bolts, the second short connecting rod mounting seat 2-8 is fixed to the bottom support 2-12 of the screw with screws, and the anchoring shell 2-13 is fixed to the bottom support of the screw with screws, the short connecting rod 2-9 is hinged to the first and second short connecting rod mounting seats with pins, and the long connecting rod 2-10 is hinged to the short connecting rod with pins, when the screw nut moves downward, through motion transmission, the anchoring slip 2-11 on the long connecting rod gradually approaches the pipe wall until the slip teeth on the anchoring slip are embedded in the pipe wall, completing the anchoring. After the cutting work is completed, the computer command controls the anchoring motor to reverse, and the screw nut moves upward, retracting the connecting rod into the anchoring shell.

[0075] The nozzle telescopic module 3 consists of a nozzle rotating seat 3-6, four connecting rods 3-7, a hydraulic cylinder 3-8, an upper part of the nozzle mounting seat 3-14, a lower part of the nozzle mounting seat 3-13, and a nozzle 3-12.

[0076] The nozzle telescopic module 3 has a nozzle rotating seat 3-6 with an upper boss 3-6-1 that is interference-fitted with the inner hole of the bearing 3-4. The middle concave hole 3-6-4 is used for wiring. The lower lug 3-6-2 is connected to the connecting rod 3-7 through the through hole 3-6-5. The lug 3-6-3 is hinged to the connecting rod through the through hole 3-6-5. The through hole 3-6-6 is hinged to the hydraulic cylinder 3-8.

[0077] The four connecting rods 3-7 of the nozzle telescopic module 3 form a telescopic linkage mechanism. The upper end of the linkage mechanism is connected to the lugs 3-6-2 and 3-6-3 of the lower part of the nozzle rotating seat, the lower end is hinged to the upper part 3-14 of the nozzle mounting seat, and the middle part is hinged to the piston rod of the hydraulic cylinder 3-8 through the pin 3-9.

[0078] The nozzle mounting base of the nozzle telescopic module 3 consists of an upper part 3-14 and a lower part 3-13, which are connected by bolts. The lower part of the nozzle mounting base has a high-pressure abrasive jet passing through it, which causes great wear. The combination of the upper and lower parts makes it easy to replace.

[0079] The nozzle telescopic module 3 has a nozzle mounting base lower part 3-13 with a high-pressure water inlet 3-13-2 at the front end and an abrasive slurry inlet 3-13-1 from the abrasive transport module on the upper side. The high-pressure water accelerates the abrasive slurry a second time in the mixing chamber. The nozzle mounting interface 3-13-3 at the rear end is threadedly connected to the nozzle 3-12.

[0080] The nozzle telescopic module 3, the piston rod of the hydraulic cylinder 3-8 controls the extension and retraction of the linkage mechanism, and thus controls the extension and retraction of the nozzle 3-12.

[0081] The nozzle telescopic module 3 is provided with a housing 3-15 to protect the internal connecting rod 3-7, nozzle 3-12, upper part of nozzle mounting seat 3-14 and lower part of nozzle mounting seat 3-13, etc. Furthermore, a nozzle mounting seat protective shell 3-11 is provided to protect the nozzle mounting seat and nozzle and other internal parts.

[0082] During the extension of the nozzle telescopic module 3, to prevent the nozzle 3-12 from directly colliding with the sleeve wall, anti-collision wheels 3-10 are installed on the upper part 3-14 of the nozzle mounting seat.

[0083] The nozzle telescopic module 3 uses a split housing 3-5 to install the coupling 3-3.

[0084] The movement principle of the nozzle telescopic module 3 is as follows: the piston rod and the telescopic linkage mechanism composed of four connecting rods 3-7 are hinged by a pin 3-9; the upper part 3-14 of the nozzle mounting seat is hinged to the lower end of the telescopic linkage mechanism by a pin; the upper part and the lower part of the nozzle mounting seat are fixed by bolts; and the nozzle 3-12 is fixed to the lower part of the nozzle mounting seat by threads. Therefore, when the computer command controls the piston rod of the hydraulic cylinder 3-8 to extend, the telescopic linkage mechanism extends with the piston rod, thereby pushing the nozzle to the target distance. Subsequently, the nozzle motor 3-2 is controlled to rotate, realizing 360° circumferential cutting of the sleeve by the nozzle. After the cutting is completed, the nozzle motor stops working, and the piston rod of the hydraulic cylinder retracts back to its original position.

[0085] Working principle of the invention: During operation, the device is lowered into the sleeve to be cut using a cable. The computer issues a command to control the anchoring motor 2-2 to rotate, thereby pushing out the anchoring slip 2-11 to anchor against the wall. After anchoring, the computer commands the piston rod of the hydraulic cylinder 3-8 to extend. After adjusting the distance between the nozzle 3-12 and the target on the wall to the target position, the piston rod position remains unchanged. Then, a water jet with a certain pressure is introduced into the abrasive mixing chamber 1-12 of the abrasive transport module. At the same time, the abrasive motor 1-3 is controlled to work, driving the circumferential screw 1-14 to transport dry abrasive. The dry abrasive is stirred into an abrasive slurry by the drive center screw 1-13. The abrasive slurry is transported to the abrasive slurry inlet 3-13-1 of the nozzle module through the abrasive mixing chamber outlet 1-12-2. Then, the computer command controls the nozzle rotating seat 3-6 to rotate at a low speed, thereby realizing the 360° circumferential rotation of the nozzle. Finally, after the pipe wall is cut, the abrasive motor is stopped, the high-pressure water supply is stopped, the nozzle motor is stopped, the hydraulic cylinder piston rod is reset, and the anchoring motor is reversed until the anchoring connecting rod retracts into the anchoring shell and stops moving. The device of this invention is lifted to the ground with the help of a crane.

[0086] This invention uses an electric motor as the power source, but a hydraulic motor can also be used.

[0087] Although the functions and working processes of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific functions and working processes described above. The specific embodiments described above are merely illustrative and not restrictive. Many other forms can be made without departing from the spirit and scope of the claims of the present invention, and all of these are within the protection scope of the present invention.

Claims

1. A controllable premixed abrasive jet cutting device, characterized in that, It includes an abrasive transport module (1), an anchoring module (2), and a nozzle telescopic module (3) arranged from top to bottom. The abrasive transport module includes a top cover (1-2) and a shell (1-15). The top cover has a lifting lug (1-1), and the shell houses an abrasive motor (1-3). The output end of the abrasive motor has a central screw (1-13). The central screw passes through a gear mounting box (1-7), the hollow shaft section of the abrasive tank (1-9-2), and the abrasive mixing chamber (1-12) sequentially from top to bottom. The gear mounting box contains a central gear (1-16) fixed to the central screw and a circumferential gear (1-8) meshing with the central gear. The bottom is tightly connected to the top of the abrasive tank. The circumferential gear is internally connected to the circumferential screw (1-14). The bottom end of the circumferential screw is provided with a spiral groove section. The spiral groove section cooperates with the circumferential copper sleeve (1-10) that penetrates the bottom of the abrasive tank to transport the dry abrasive in the abrasive tank to the abrasive mixing chamber. The bottom end of the central screw is provided with a spiral groove section. The spiral groove section cooperates with the central copper sleeve (1-11) that penetrates the bottom of the abrasive mixing chamber to stir the dry abrasive and water in the abrasive mixing chamber into an abrasive slurry and transport the abrasive slurry to the nozzle telescopic module through the central copper sleeve and pipeline. An anchoring motor (2-2) is installed inside the outer shell (2-13) of the anchoring module. The anchoring motor drives and connects to a ball screw (2-14). The upper and lower ends of the ball screw are respectively fitted with first and second short connecting rod mounting seats (2-8). The top of the first short connecting rod mounting seat is fixed with a screw nut (2-7), and the bottom of the second short connecting rod mounting seat is fixed with a screw bottom support (2-12). Three short connecting rods (2-9) are hinged to the first and second short connecting rod mounting seats in the circumferential direction. A long connecting rod (2-10) is hinged between opposite sets of short connecting rods. An anchoring slip (2-11) is installed on the outside of the long connecting rod. The nozzle telescopic module is equipped with a nozzle motor (3-2), which drives the nozzle rotating seat (3-6). The bottom of the nozzle rotating seat is hinged to the nozzle mounting support through four telescopic connecting rods (3-7). The nozzle mounting support is equipped with a nozzle (3-12). The four telescopic connecting rods are divided into two groups. The upper end of one of the rods in each group is hinged to the lower end of the other through a hydraulic cylinder (3-8).

2. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The gear mounting box (1-7) also contains a circumferential thrust ball bearing (1-18) and a central thrust ball bearing (1-17) that respectively mate with the circumferential screw (1-14) and the central screw (1-13).

3. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The abrasive tank (1-9) of the abrasive transport module is in the shape of a grooved ring. The hollow shaft section (1-9-2) designed in the middle is the channel for the central screw (1-13). The bottom of the tank is provided with three abrasive outlets (1-9-3~1-9-5) of equal diameter for installing the circumferential copper sleeve (1-10). The upper lugs (1-9-6, 1-9-7) have abrasive filling ports (1-9-10) on their sides.

4. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The outer shell (1-15) of the abrasive transport module is split, and grooves (1-15-1, 1-15-2) are opened on the split shell. The grooves cooperate with the lugs of the gear cover (1-6), the gear mounting box (1-7), the abrasive tank (1-9), and the abrasive mixing chamber (1-12), thereby realizing the circumferential and axial positioning of the gear cover, gear mounting box, abrasive tank, and abrasive mixing chamber.

5. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The lead screw nut (2-7) of the anchoring module is a round flange nut, and the outer diameter of the first short connecting rod mounting seat (2-8) is equal to that of the round flange of the lead screw nut. The two are fastened together with bolts.

6. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The short connecting rod (2-9) of the anchoring module is designed with a curved structure, and there is no dead point in the movement of the short connecting rod during the anchoring process.

7. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The first and second short connecting rod mounting seats are each provided with a travel protection block (2-8-2) on three lugs (2-8-1) arranged in the circumferential direction.

8. The controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The nozzle mounting bracket of the nozzle telescopic module consists of an upper part (3-14) and a lower part (3-13), which are fastened together by bolts.

9. A controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The upper part of the nozzle rotating seat (3-6) boss (3-6-1) is interference-fitted with the inner ring of the bearing (3-4), and the outer ring of the bearing is interference-fitted with the split housing (3-5).

10. A controllable premixed abrasive jet cutting device according to claim 1, characterized in that, The abrasive transport module and the anchoring module are fixed together by screws, and the anchoring module and the nozzle telescopic module are fixed together by tapered threads.

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