Hydraulic sand blasting front end cutting device

Abstract

The utility model provides a hydraulic sand blasting front end cutting device which comprises a frame, a tail end connecting structure arranged at one end of the frame, a V-shaped positioning fork assembly arranged at the other end of the frame and supporting leg assemblies symmetrically arranged on the two sides of the frame, and the tail end connecting structure is used for being rotatably connected with a telescopic arm of equipment; the V-shaped positioning fork assembly is used for quickly positioning a wellhead; the sand blasting device further comprises a sand blasting pipe assembly arranged in the frame, one end of the sand blasting pipe assembly penetrates through the frame and is arranged above the V-shaped positioning fork assembly in a sliding mode in the axial direction of the frame, and the working end of the sand blasting pipe assembly at least comprises two spraying heads used for conducting hydraulic sand blasting cutting on a wellhead. The well mouth to be cut can be quickly positioned and captured through the V-shaped positioning fork assembly, and the operation stability and the operation efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of water jet cutting technology, and in particular to a water jet sandblasting front-end cutting device. Background Technology

[0002] Telescopic boom hydraulic blasting cutting devices are used to hydraulically cut burning wellheads in oil and gas field fires. Hydraulic blasting cutting is a cutting technology that uses high-pressure water with added hard abrasive to propel the cutting surface. The cutting is achieved by the high-speed impact of the hard abrasive on the cutting surface, and a single cutting operation typically takes more than 30 minutes. Monitoring data shows that the temperature within a 2-meter diameter area of ​​the wellhead can reach over 1200℃, and the ambient temperature within 5 meters of the wellhead exceeds 600℃. Furthermore, the impact of the high-pressure water flow causes significant vibration of the cutting head. Existing hydraulic blasting cutting devices suffer from poor cutting stability and cannot quickly locate and capture the wellhead to be cut, resulting in low operational efficiency.

[0003] Therefore, there is an urgent need for a water jet sandblasting front-end cutting device that can quickly locate and capture the wellhead to be cut, and improve operational stability and efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a front-end cutting device for hydraulic sandblasting, which aims to solve the technical problems of poor operational stability, inability to quickly capture the wellhead to be cut, and low operating efficiency of traditional hydraulic sandblasting cutting devices.

[0005] To achieve the above objectives, this utility model provides a water jet sandblasting front-end cutting device, comprising:

[0006] frame;

[0007] A tail-end connection structure is provided at one end of the frame for rotatable connection with the telescopic arm of the equipment;

[0008] The V-shaped positioning fork assembly is located at the other end of the frame and is used for rapid positioning of the wellhead;

[0009] A sandblasting pipe assembly is disposed within the frame, with one end passing through the frame and slidably disposed above the V-shaped positioning fork assembly along its axial direction. The working end of the sandblasting pipe assembly includes at least two jet heads for hydraulic sandblasting cutting of the wellhead.

[0010] Two sets of support leg assemblies are symmetrically arranged on both sides of the frame.

[0011] As a further improvement to the above solution, the V-shaped positioning fork assembly includes a support tube, a first connecting plate sealing one end of the support tube, and a V-shaped positioning plate disposed at the other end of the support tube.

[0012] The support tube is also provided with guide rail plates on both sides, so that the sandblasting tube assembly can be slidably mounted on them.

[0013] As a further improvement to the above solution, the sandblasting pipe assembly is slidably mounted above the V-shaped positioning fork assembly via a power transmission assembly;

[0014] The power transmission component is located at the bottom of the frame.

[0015] As a further improvement to the above solution, the power transmission assembly includes a power lead screw, a lead screw nut slidably disposed on the power lead screw, a guide rod assembly symmetrically disposed on both sides of the power lead screw, and a sliding support seat;

[0016] The guide rod assembly includes a guide rod and a slider slidably disposed on the guide rod;

[0017] One end of the sliding support is connected to the lead screw nut and the slider, and the other end is connected to the sandblasting pipe assembly.

[0018] As a further improvement to the above solution, the sandblasting pipe assembly includes a straight pipe, a Y-shaped tee connected to one end of the straight pipe, a blasting elbow connected to the Y-shaped tee, and a blasting head disposed at the end of the blasting elbow; and a guide carriage.

[0019] One end of the guide carriage is connected to the straight tube near the Y-shaped tee end, and the other end is rotatably mounted on the guide rail plate.

[0020] As a further improvement to the above solution, the guide carriage includes a bracket, a clamp disposed on the top of the bracket, and rollers symmetrically disposed on both sides of the bracket.

[0021] The guide carriage is fixedly connected to the straight tube via the clamp.

[0022] As a further improvement to the above solution, the water jetting front-end cutting device also includes a heat insulation component, which is disposed at the other end of the frame;

[0023] The V-shaped positioning fork assembly is disposed at the other end of the frame via a thermal insulation component.

[0024] As a further improvement to the above solution, the heat insulation component includes a heat insulation cover and heat insulation cotton. The heat insulation cover is connected to the other end of the frame, and the heat insulation cotton is disposed on the surface of the heat insulation cover facing the V-shaped positioning fork assembly.

[0025] As a further improvement to the above solution, the V-shaped positioning fork assembly also includes a V-shaped rib plate, which is correspondingly disposed on the outside of the V-shaped positioning plate and welded to the support tube as a whole.

[0026] As a further improvement to the above solution, the V-shaped positioning fork assembly also includes a pair of first stiffeners and a pair of second stiffeners. The first stiffeners are symmetrically arranged at the lower part of one end of the support tube, and the second stiffeners are symmetrically arranged at the upper part of one end of the support tube. Both the first stiffeners and the second stiffeners are connected to the first connecting plate.

[0027] As a further improvement to the above solution, a blocking plate is also provided at the opening at the other end of the support pipe so that the support pipe forms a closed inner cavity. Several nozzles are spaced apart on the support pipe, and a pipe joint for connecting water pipes is provided on the first connecting plate.

[0028] As a further improvement to the above solution, the water jet sandblasting front-end cutting device also includes a spraying assembly for spraying coolant onto the device. The spraying assembly includes a spraying network pipe and a plurality of spraying heads disposed on the spraying network pipe. The spraying network pipe is disposed above the frame and includes a U-shaped main pipe and a first branch pipe and a plurality of second branch pipes disposed on the U-shaped main pipe. The first branch pipe is connected to a pipe joint on the first connecting plate, and the plurality of second branch pipes are respectively disposed on both sides of the support leg assembly.

[0029] As a further improvement to the above solution, the outrigger assembly includes a fixed outrigger, a retractable outrigger disposed inside the fixed outrigger, and an outrigger base;

[0030] The support leg base is hinged to the bottom of the movable support leg.

[0031] As a further improvement to the above solution, the tail end connection structure includes a rotating shaft, a connecting rod, a tilting frame disposed at one end of the frame, and hinge plates disposed on both sides of the end of the telescopic arm of the equipment.

[0032] The flipping frame is provided with a first lug and a second lug. One end of the hinge plate is connected to the second lug. The rotating shaft is rotatably disposed at the other end of the hinge plate and is located between the two hinge plates.

[0033] One end of the connecting rod is rotatably connected to the first lug via a pin, and the other end of the connecting rod can slide through the pivot.

[0034] Because this utility model adopts the above technical solutions, the beneficial effects of this application are as follows:

[0035] 1. This utility model provides a hydraulic sandblasting front-end cutting device, including a frame, a tail end connecting structure disposed at one end of the frame, a V-shaped positioning fork assembly disposed at the other end of the frame, and support leg assemblies symmetrically disposed on both sides of the frame. The tail end connecting structure is used to rotatably connect with the telescopic arm of the device; the V-shaped positioning fork assembly is used for rapid positioning of the wellhead; it also includes a sandblasting pipe assembly disposed within the frame, with one end of the sandblasting pipe assembly passing through the frame and slidably disposed above the V-shaped positioning fork assembly along its axial direction. The working end of the sandblasting pipe assembly includes at least two jet heads for hydraulic sandblasting cutting of the wellhead. In this invention, a V-shaped positioning fork assembly is provided at the working front end of the device. The V-shaped structure has the characteristic of automatic centering with the cylindrical structure, enabling rapid positioning and capture of the wellhead to be cut. A tail-end connection structure is also provided for rotatable connection with the telescopic arm of the equipment. The tail-end connection structure allows the hydraulic sandblasting front-end cutting device to be tilted relative to the telescopic arm of the equipment, ensuring that the cutting section is perpendicular to the wellhead axis and improving cutting efficiency. Furthermore, the working end of the sandblasting pipe assembly includes at least two jet heads. Two or more jet heads result in a faster cutting speed than a single jet head, further improving cutting efficiency. The sandblasting pipe assembly can slide along its axis above the V-shaped positioning fork assembly. While achieving positioning, the V-shaped positioning fork assembly also provides stable support for the sandblasting pipe assembly, further improving cutting efficiency.

[0036] 2. This utility model provides a water jet blasting front-end cutting device, which further includes a heat insulation component. The heat insulation component is disposed at the other end of the frame to reduce high-temperature radiation to the frame and the rear-end components. In addition, the water jet blasting front-end cutting device also includes a spray component for spraying coolant onto the device. The support pipe is provided with nozzles and pipe joints for connecting to the spray component, enabling the spraying of coolant onto the V-shaped positioning fork assembly and the sandblasting pipe assembly. The heat insulation component and the spray component can effectively protect the front-end cutting device from high temperatures. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a three-dimensional schematic diagram of a water jet sandblasting front-end cutting device disclosed in this utility model. Figure 1 ;

[0039] Figure 2 This is a three-dimensional schematic diagram of a water jet sandblasting front-end cutting device disclosed in this utility model. Figure 2 ;

[0040] Figure 3 This is a three-dimensional schematic diagram of a water jet sandblasting front-end cutting device disclosed in this utility model. Figure 3 ;

[0041] Figure 4 This is a three-dimensional schematic diagram of a water jet sandblasting front-end cutting device disclosed in this utility model. Figure 4 ;

[0042] Figure 5 This is a three-dimensional schematic diagram of the V-shaped positioning fork assembly disclosed in this utility model;

[0043] Figure 6 This is a three-dimensional schematic diagram of the guide carriage disclosed in this utility model;

[0044] Figure 7 This is a three-dimensional schematic diagram of the sandblasting pipe assembly disclosed in this utility model;

[0045] Figure 8 This is a schematic diagram showing the comparison before and after rotation of the telescopic arm connection between the front-end cutting device and the equipment of the water jet sandblasting disclosed in this utility model. Figure 8 (a) is a schematic diagram of the front-end cutting device of this water jet sandblasting before it rotates. Figure 8 (b) is a schematic diagram of the front-end cutting device of this water jet sandblasting after it has been rotated;

[0046] Figure label:

[0047] 1. Framework;

[0048] 2. Tail-end connection structure; 21. Rotating shaft; 22. Connecting rod; 23. Tilting frame; 231. First lug; 232. Second lug; 24. Hinge plate;

[0049] 3. V-shaped positioning fork assembly; 31. Support tube; 311. Nozzle; 32. First connecting plate; 33. V-shaped positioning plate; 34. Guide rail plate; 35. V-shaped rib plate; 36. First stiffening plate; 37. Second stiffening plate; 38. Blocking plate; 39. Pipe joint;

[0050] 4. Sandblasting pipe assembly; 41. Straight pipe; 42. Y-type tee; 43. Sandblasting elbow; 44. Sandblasting head; 45. Guide carriage; 451. Bracket; 452. Clamp; 453. Roller;

[0051] 5. Support leg assembly; 51. Fixed support leg; 52. Movable support leg; 53. Support leg base;

[0052] 6. Power transmission assembly; 61. Lead screw; 62. Lead screw nut; 63. Sliding support; 64. Guide rod; 65. Slider;

[0053] 7. Thermal insulation components; 71. Thermal insulation cover; 72. Thermal insulation cotton;

[0054] 8. Sprinkler assembly; 81. Sprinkler network pipe; 811. Main pipe; 812. First branch pipe; 813. Second branch pipe; 82. Sprinkler head; 9. Telescopic arm.

[0055] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0056] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0058] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0059] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0060] See Figures 1-8 This utility model provides a water jet sandblasting front-end cutting device, comprising:

[0061] Frame 1, specifically, is integrally welded from square or rectangular tubes to provide stable support for the front-end cutting device. Second connecting plates are welded to the front and rear ends of the frame 1, and third connecting plates for the installation of the support leg assembly 5 are welded to the left and right sides of the frame 1.

[0062] Tail-end connection structure 2 is disposed at one end of the frame 1 and is used to rotatably connect with the telescopic arm 9 of the equipment. Specifically, the tail-end connection structure 2 is connected to the frame 1 through a second connecting plate.

[0063] V-shaped positioning fork assembly 3 is disposed at the other end of the frame 1 for quick positioning of the wellhead;

[0064] A sandblasting pipe assembly 4 is disposed within the frame 1, with one end passing through the frame 1 and slidably disposed above the V-shaped positioning fork assembly 3 along its axial direction. The working end of the sandblasting pipe assembly 4 includes at least two jet heads 44 for hydraulic sandblasting cutting of the wellhead.

[0065] Two sets of support leg assemblies 5 are symmetrically arranged on both sides of the frame 1 to provide stable support for the front cutting device;

[0066] In this invention, a V-shaped positioning fork assembly 3 is provided at the working front end of the device. The V-shaped structure has the characteristic of automatic centering with the cylindrical structure, which can quickly locate and capture the wellhead to be cut. A tail end connection structure 2 is also provided for rotatably connecting with the telescopic arm 9 of the equipment. The tail end connection structure 2 allows the front end cutting device of this hydraulic sandblasting device to be tilted relative to the telescopic arm 9 of the equipment to ensure that the cutting section is perpendicular to the axis of the wellhead and improve the cutting efficiency. In addition, the working end of the sandblasting pipe assembly 4 includes at least two spray heads 44. The cutting speed of two or more spray heads 44 is faster than that of a single spray head 44, further improving the cutting efficiency. The sandblasting pipe assembly 4 can slide along its axis above the V-shaped positioning fork assembly 3. The V-shaped positioning fork assembly 3 not only achieves positioning but also provides stable support for the sandblasting pipe assembly 4, further improving the cutting efficiency.

[0067] As a preferred embodiment, see Figure 5 The V-shaped positioning fork assembly 3 includes a support tube 31, a first connecting plate 32 that seals one end of the support tube 31, and a V-shaped positioning plate 33 disposed at the other end of the support tube 31.

[0068] The support pipe 31 is also provided with guide rail plates 34 on both sides, so that the sandblasting pipe assembly 4 can be slidably mounted on them; with this arrangement, the cylindrical wellhead is automatically centered by the V-shaped positioning plate 33, so as to quickly locate and capture the wellhead to be cut. At the same time, the guide rail plates 34 on both sides of the support pipe 31 are cleverly provided so that the sandblasting pipe assembly 4 can be slidably mounted on them, so that the V-shaped positioning fork assembly 3 can provide stable support for the sandblasting pipe assembly 4 while achieving positioning.

[0069] The V-shaped positioning fork assembly 3 also includes a V-shaped rib plate 35, which is correspondingly disposed on the outer side of the V-shaped positioning plate 33 and welded to the support tube 31 as a whole.

[0070] The V-shaped positioning fork assembly 3 also includes a pair of first stiffeners 36 and a pair of second stiffeners 37. The pair of first stiffeners 36 are symmetrically arranged at the lower part of one end of the support tube 31, and the pair of second stiffeners 37 are symmetrically arranged at the upper part of one end of the support tube 31. Both the first stiffeners 36 and the second stiffeners 37 are connected to the first connecting plate 32.

[0071] The V-shaped rib 35, the first stiffener 36, and the second stiffener 37 are provided to effectively improve the strength and rigidity of the V-shaped positioning fork assembly 3, so as to provide stable positioning support.

[0072] A blocking plate 38 is also provided at the opening at the other end of the support pipe 31 so that the support pipe 31 forms a closed inner cavity. Several nozzles 311 are provided at intervals on the support pipe 31, and the first connecting plate 32 is provided with a pipe joint 39 for connecting water pipes. With this arrangement, as long as the pipe joint 39 is connected to the corresponding cooling pipe, coolant can be sprayed through the nozzles 311 to reduce the impact of the high temperature at the wellhead on the front-end cutting device.

[0073] The V-shaped positioning fork assembly 3 provided by this utility model integrates positioning, guiding support and spray cooling, making the front-end cutting device compact in structure.

[0074] As a preferred embodiment, see Figures 1-4 The sandblasting pipe assembly 4 is slidably mounted above the V-shaped positioning fork assembly 3 via the power transmission assembly 6; the power transmission assembly 6 is located at the bottom of the frame 1.

[0075] The power transmission assembly 6 includes a power screw 61, a screw nut 62 slidably disposed on the power screw 61, a group of guide rods 64 symmetrically disposed on both sides of the power screw 61, and a sliding support seat 63;

[0076] The guide rod 64 group includes a guide rod 64 and a slider 65 slidably disposed on the guide rod 64;

[0077] One end of the sliding support 63 is connected to the lead screw nut and slider 65, and the other end is connected to the sandblasting pipe assembly 4. In this embodiment, the power lead screw 61 is a trapezoidal lead screw, and correspondingly, the lead screw nut 62 is a trapezoidal lead screw nut 62 that matches the trapezoidal lead screw. The power lead screw 61 is connected to the driving power through a coupling, and the driving power provides torque to the trapezoidal lead screw. With this configuration, the rotation of the power lead screw 61 causes the lead screw nut 62 to move axially, thereby driving the sliding support 63 mounted on the lead screw nut 62 to move axially under the guidance of the guide rod 64 assembly. The other end of the sandblasting pipe assembly 4 is connected to the sliding support 63, which in turn drives the sandblasting pipe assembly 4 to move axially, so that the spray head 44 of the sandblasting pipe assembly 4 can be moved to the wellhead to be cut in a timely manner.

[0078] As a preferred embodiment, see Figure 7 The sandblasting pipe assembly 4 includes a straight pipe 41, a Y-shaped tee 42 connected to one end of the straight pipe 41, a blasting elbow 43 connected to the Y-shaped tee 42, and a blasting head 44 disposed at the end of the blasting elbow 43; and a guide carriage 45; specifically, one end of the straight pipe 41 passes through the frame 1 and is connected to the Y-shaped tee 42, the blasting elbow 43, and the blasting head 44, and the other end of the straight pipe 41 is also provided with a 90° elbow and a movable elbow; the movable elbow is composed of two 90° elbows connected together and can rotate axially around the connection point; the other end of the sliding support 63 is fixedly connected to the end of the straight pipe 41 away from the Y-shaped tee 42 by a clamp 452;

[0079] One end of the guide carriage 45 is connected to the end of the straight tube 41 near the Y-shaped tee 42, and the other end is rotatably mounted on the guide rail plate 34.

[0080] For details, see Figure 6 The guide carriage 45 includes a bracket 451, a clamp 452 disposed on the top of the bracket 451, and rollers 453 symmetrically disposed on both sides of the bracket 451. In this embodiment, the bracket 451 is an inverted U-shaped bracket, and the clamp 452 is disposed on the top of the inverted U-shaped bracket so that the guide carriage 45 is fixedly connected to the straight tube 41 through the clamp 452. The two ears of the inverted U-shaped bracket are respectively provided with shaft holes. The rollers 453 include bolts and rolling bearings disposed on the bolts. The bolts pass through the shaft holes and are fastened to the bracket 451. The rolling bearings move on the guide plate 34 of the V-shaped positioning fork assembly 3 under the drive of the power transmission assembly 6.

[0081] In this utility model, the power transmission component 6 drives the sliding support 63 to move, thereby driving the straight pipe 41 set on the upper cover of the sliding support 63 to move. Under the sliding guidance of the guide slide 45, the sandblasting pipe assembly 4 can stably extend and retract along its axial direction, thereby driving the jet head 44 to extend to perform hydraulic sandblasting and cutting at the wellhead or driving the jet head 44 to retract.

[0082] It should be noted that a guide sleeve is also provided on the second connecting plate at the other end of the frame 1 so that the straight tube 41 can move through it.

[0083] In a preferred embodiment, the water jetting front-end cutting device further includes a heat insulation component 7, which is disposed at the other end of the frame 1;

[0084] The V-shaped positioning fork assembly 3 is disposed at the other end of the frame 1 via the thermal insulation assembly 7;

[0085] The heat insulation component 7 includes a heat insulation cover 71 and heat insulation cotton 72. The heat insulation cover 71 is connected to the other end of the frame 1, and the heat insulation cotton 72 is disposed on the surface of the heat insulation cover 71 facing the V-shaped positioning fork component 3.

[0086] The installation of the heat insulation component 7 can greatly reduce the heat radiation from the high temperature near the wellhead to the frame 1 and the rear-end components of the frame 1, thereby improving the life of the front-end cutting device of this hydraulic sandblasting.

[0087] As a preferred embodiment, see Figure 2 The water jet sandblasting front-end cutting device also includes a spray assembly 8 for spraying coolant onto the device. The spray assembly 8 includes a spray mesh pipe 81 and a plurality of spray heads 82 disposed on the spray mesh pipe 81. The spray mesh pipe 81 is disposed above the frame 1 and includes a loop-shaped main pipe 811 and a first branch pipe 812 and a plurality of second branch pipes 813 disposed on the loop-shaped main pipe 811. The first branch pipe 812 is connected to a pipe joint 39 on the first connecting plate 32, and the plurality of second branch pipes 813 are respectively disposed on the support legs. The spray assembly 8 is located on both sides of component 5. It supplies coolant to the main pipe 811, and sprays coolant onto the frame 1 through the spray nozzles 82 mounted on the main pipe 811. It also supplies coolant to the support pipe 31 through the first branch pipe 812, allowing it to spray coolant onto the V-shaped positioning fork assembly 3 at the working front end, and onto the support leg assembly 5 through the second branch pipe 813. The spray assembly 8 is designed to spray coolant onto various parts of the water jet cutting front end device, thereby reducing the temperature of the device.

[0088] As a preferred embodiment, see Figure 2The outrigger assembly 5 includes a fixed outrigger 51, a retractable outrigger 52 disposed inside the fixed outrigger 51, and an outrigger seat 53.

[0089] The support leg base 53 is hinged to the bottom of the movable support leg 52; the hinged arrangement of the support leg base 53 and the movable support leg 52 enables the support leg assembly 5 to make stable contact with the ground under any terrain conditions, thereby ensuring that the support leg assembly 5 can provide stable support.

[0090] As a preferred embodiment, see Figure 1 , Figure 2 and Figure 8 The tail end connection structure 2 includes a rotating shaft 21, a connecting rod 22, a flipping frame 23 set at one end of the frame 1, and also includes hinge plates 24 set on both sides of the end of the telescopic arm 9 of the equipment.

[0091] The flipping frame 23 is provided with a first lug 231 and a second lug 232. One end of the hinge plate 24 is connected to the second lug 232. The rotating shaft 21 is rotatably disposed at the other end of the hinge plate 24 and is located between the two hinge plates 24.

[0092] One end of the connecting rod 22 is rotatably connected to the first lug 231 via a pin, and the other end of the connecting rod 22 can slide through the rotating shaft 21; and a limiting member is also provided at the other end of the connecting rod 22 to prevent the other end of the connecting rod 22 from disengaging from the rotating shaft 21;

[0093] In this embodiment, the middle part of the rotating shaft 21 is provided with a through hole for the connecting rod 22 to pass through, and the axis of the through hole is perpendicular to the axis of the rotating shaft 21; the limiting member is a locking nut, and correspondingly, the other end of the connecting rod 22 is provided with an external thread that matches the locking nut;

[0094] In some preferred embodiments, the tilting frame 23 is also equipped with a tilt sensor for real-time monitoring of the tilt angle of the entire device;

[0095] The tail-end connection structure 2 allows the tilt angle of the water jet cutting device relative to the telescopic arm 9 to be adjusted when the outrigger assembly 5 is in contact with the ground. With the feedback from the tilt sensor, the entire device can be adjusted to a horizontal state, thereby ensuring that the device can perform cutting operations stably.

[0096] To further illustrate the inventive concept of the water jet blasting front-end cutting device, the working process of this water jet blasting front-end cutting device is described below: When the device reaches the high-temperature working area, cooling water is supplied to the support pipe 31 of the spray assembly 8 and the V-shaped positioning fork assembly 3 and sprayed out from the spray head 82 to cool and protect the entire device. When it is close to the wellhead to be cut, the movable legs 52 of the two leg assemblies 5 extend until they contact the ground. Due to the hinged setting of the leg seat 53, the leg seat 53 can stably contact the ground under any terrain conditions. At the same time, since the connecting rod 22 passes through the rotating shaft 21, its degree of freedom along its own axis is not restricted. When the leg assembly 5 contacts the ground, if the telescopic arm 9 performs telescopic and pitching movements, the entire device will rotate around the hinge point of the leg seat 53. The tilt sensor set on the tilting frame 23 feeds back the tilt data of the entire cutting device, which can be used to adjust the overall tilt angle of the cutting device. The device is adjusted to a horizontal state. The V-shaped positioning fork assembly 3 automatically centers the wellhead to be cut and makes tangential contact with the cylindrical surface of the wellhead using its V-shaped structure at the front end. Then, torque is input to the power screw 61 to make it rotate. Since the trapezoidal threaded hole of the screw nut 62 meshes with the trapezoidal thread of the power screw 61, the screw nut 62 is connected to the sliding support seat 63. The sliding support seat 63 can only slide axially on the guide rod 64. The straight pipe 41 of the sandblasting pipe assembly 4 is fixed on the clamp 452 of the sliding support seat 63. The power screw 61 uses the principle of screw transmission to make the sandblasting pipe assembly 4 move axially along the power screw 61. The guide slide 45 installed on the sandblasting pipe assembly 4 slides on the guide rail plate 34 to ensure the stability of the sandblasting pipe assembly 4 during the movement. When it is close to the wellhead to be cut, the high-pressure sandblasting pipe assembly adds cutting fluid from the movable elbow. The cutting fluid is sprayed out from the two spray nozzles 44 at the same time, cutting the wellhead.

[0097] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A water jet sandblasting front-end cutting device, characterized in that, include: frame; A tail-end connection structure is provided at one end of the frame for rotatable connection with the telescopic arm of the equipment; The V-shaped positioning fork assembly is located at the other end of the frame and is used for rapid positioning of the wellhead; A sandblasting pipe assembly is disposed within the frame, with one end passing through the frame and slidably disposed above the V-shaped positioning fork assembly along its axial direction. The working end of the sandblasting pipe assembly includes at least two jet heads for hydraulic sandblasting cutting of the wellhead. Two sets of support leg assemblies are symmetrically arranged on both sides of the frame; The V-shaped positioning fork assembly includes a support tube, a first connecting plate that seals one end of the support tube, and a V-shaped positioning plate disposed at the other end of the support tube. The support tube is also provided with guide rail plates on both sides, so that the sandblasting tube assembly can be slidably mounted on them.

2. The water jet sandblasting front-end cutting device according to claim 1, characterized in that, The sandblasting pipe assembly is slidably mounted above the V-shaped positioning fork assembly via a power transmission assembly. The power transmission component is disposed at the bottom of the frame; The power transmission assembly includes a power lead screw, a lead screw nut slidably mounted on the power lead screw, a guide rod assembly symmetrically arranged on both sides of the power lead screw, and a sliding support seat; The guide rod assembly includes a guide rod and a slider slidably disposed on the guide rod; One end of the sliding support is connected to the lead screw nut and the slider, and the other end is connected to the sandblasting pipe assembly.

3. A water jet sandblasting front-end cutting device according to claim 1 or 2, characterized in that, The sandblasting pipe assembly includes a straight pipe, a Y-shaped tee connected to one end of the straight pipe, a blasting elbow connected to the Y-shaped tee, and a blasting head disposed at the end of the blasting elbow; And guide carriages; One end of the guide carriage is connected to the straight tube near the Y-shaped tee end, and the other end is rotatably mounted on the guide rail plate.

4. A water jet sandblasting front-end cutting device according to claim 1 or 2, characterized in that, The water jet cutting device also includes a heat insulation component, which is disposed at the other end of the frame. The V-shaped positioning fork assembly is disposed at the other end of the frame via a thermal insulation component.

5. A water jet sandblasting front-end cutting device according to claim 1 or 2, characterized in that, The V-shaped positioning fork assembly also includes a V-shaped rib, which is disposed on the outer side of the V-shaped positioning plate and welded to the support tube as a whole.

6. A water jet sandblasting front-end cutting device according to claim 1 or 2, characterized in that, A blocking plate is also provided at the opening at the other end of the support pipe so that the support pipe forms a closed inner cavity. Several nozzles are spaced apart on the support pipe, and a pipe joint for connecting water pipes is provided on the first connecting plate.

7. The water jetting front-end cutting device according to claim 6, characterized in that, The water jet cutting device also includes a spraying assembly for spraying coolant onto the device. The spray assembly includes a spray network pipe and a plurality of spray heads disposed on the spray network pipe. The spray network pipe is disposed above the frame and includes a loop main pipe and a first branch pipe and a plurality of second branch pipes disposed on the loop main pipe. The first branch pipe is connected to a pipe joint on the first connecting plate, and the plurality of second branch pipes are respectively disposed on both sides of the support leg assembly.

8. A water jet sandblasting front-end cutting device according to claim 1 or 2, characterized in that, The outrigger assembly includes a fixed outrigger, a retractable outrigger disposed inside the fixed outrigger, and an outrigger base; The support leg base is hinged to the bottom of the movable support leg.

9. A water jet sandblasting front-end cutting device according to claim 1 or 2, characterized in that, The tail end connection structure includes a rotating shaft, a connecting rod, a tilting frame set at one end of the frame, and hinge plates set on both sides of the end of the telescopic arm of the equipment. The flipping frame is provided with a first lug and a second lug. One end of the hinge plate is connected to the second lug. The rotating shaft is rotatably disposed at the other end of the hinge plate and is located between the two hinge plates. One end of the connecting rod is rotatably connected to the first lug via a pin, and the other end of the connecting rod can slide through the pivot.

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