Quick-connection locking positive and negative rotation coal mine fracturing pipe and matching unlocking mechanism

Abstract

This invention discloses a quick-connect locking forward and reverse reversible coal mine fracturing pipe and a matching unlocking mechanism. After the fracturing pipes are connected, they are locked in place by a short-spinning locking mechanism with a rotating locking boss and a wide-groove internal locking mechanism. A sealing ring is provided on the front side wall of the fracturing pipe, and an inner front sealing surface is provided on the rear inner wall. After adjacent sections of fracturing pipe are joined and tightened, the sealing ring and the inner front sealing surface cooperate to achieve a seal. A locking and braking mechanism is provided at the front or rear joint of the fracturing pipe. The locking and braking mechanism includes a radial ejector pin mechanism, an axial ejector pin mechanism, a reverse-locking ratchet structure, and a composite wedge-type locking structure. This invention achieves a quick and sealed connection of the fracturing pipe with a short spin, while avoiding the problem of easy self-loosening during short spins. The locking mechanism achieves continuous locking of the fracturing pipe, the fine-tooth progressive locking achieves stepped anti-wear locking, and the expanding wedge achieves anti-wear continuous locking, ensuring long-term sealed use of the fracturing pipe.

Description

Technical Field

[0001] This invention belongs to the field of coal mine safety technology and relates to a quick-connect forward and reverse fracturing pipe and its matching unlocking mechanism used in underground coal mine boreholes. Background Technology

[0002] Hydraulic fracturing technology for underground coal mine drilling has been widely applied in various fields such as enhanced gas extraction, mine pressure control, and efficient hard coal mining. Fracturing tubing is not only the carrier for fracturing devices such as packers and perforators during borehole operations, but also the channel for delivering high-pressure fracturing fluid, making it an indispensable basic tool for in-hole fracturing operations. Conventional threaded connections for fracturing tubing are time-consuming and labor-intensive to install and disassemble. Furthermore, in-hole tools cannot be rotated in reverse, limiting the application of various in-hole fracturing tools and hindering the optimization of fracturing processes. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a quick-connect locking forward and reverse reversible coal mine fracturing pipe and a matching unlocking mechanism. This solves the problems of time-consuming and labor-intensive quick-connect sealing of existing fracturing pipes and their inapplicability to forward and reverse rotation. It also avoids the problem of easy self-loosening of fracturing pipes during short rotations. The locking mechanism achieves continuous locking of the fracturing pipe, the fine-tooth progressive locking achieves stepped anti-wear locking, and the expansion wedge achieves anti-wear continuous locking of the fracturing pipe, ensuring long-term sealed use of the fracturing pipe.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A quick-connect locking forward and reverse reversible coal mine fracturing pipe is disclosed. This fracturing pipe is a hollow pipe, and multiple sections of hollow pipe can be connected end-to-end. Each section of the fracturing pipe has circumferentially distributed rotating locking bosses on its front sidewall, and circumferentially distributed wide-groove short rotating internal buckles on its rear inner sidewall. When two adjacent sections of the fracturing pipe are joined, they are secured by the rotating locking bosses engaging with the wide-groove short rotating internal buckles and then tightening with a short rotation. The front sidewall of the fracturing pipe also has a sealing groove located in front of the rotating locking bosses, and a sealing ring is installed in this groove. The rear inner sidewall of the fracturing pipe has an inner front sealing surface located in front of the wide-groove short rotating internal buckles. When two adjacent sections of the fracturing pipe are joined and tightened, the sealing ring and the inner front sealing surface cooperate to achieve a seal. A locking and braking mechanism is provided at the front or rear joint of the fracturing pipe.

[0006] The present invention also includes the following technical features:

[0007] Specifically, the wide-groove short-rotary inner buckle includes a circumferential boss and an end-limiting boss at one end; the rotating bosses are connected by a rotating boss groove; when the front end of the rear fracturing tube is inserted into the rear end of the front fracturing tube, the rotating boss can be axially inserted through the gap between two adjacent wide-groove short-rotary inner buckles, and after rotation, it is locked in the space enclosed by the circumferential boss, the end-limiting boss, and the inner front sealing surface of the wide-groove short-rotary inner buckle.

[0008] Specifically, the locking and braking mechanism is a radial ejection pin mechanism, including a radial pin, a radial spring, and a pin cap. The radial ejection pin mechanism is located at the radial pin mounting hole on the rear side wall of the fracturing tube. The pin cap is installed at the outer end of the radial pin mounting hole, and the radial spring is located between the pin cap and the radial pin. The radial pin can extend out of the inner end of the radial pin mounting hole into the fracturing tube. After the front and rear fracturing tube sections are tightened, the radial pin pops out at the groove of the locking boss, which can prevent the two fracturing tube sections from being unscrewed so as to achieve forward and reverse rotation.

[0009] Specifically, the tail end of the radial pin is made of magnetic material, and a magnetic shielding sleeve is fitted on the radial pin. The magnetic shielding sleeve isolates the radial pin from the fracturing tube. The radial pin is attached to the outer diameter side of the rear end of the fracturing tube by a strong magnetic unlocking mechanism, which can lift and retract the radial pin to unlock it, so that the two sections of the fracturing tube can be unscrewed and disassembled.

[0010] Specifically, the locking and braking mechanism is an axial pop-out pin mechanism, including a strong spring and a pin. The axial pop-out pin mechanism is located at the pin mounting groove on the end face of the fracturing tube, and the strong spring is located between the bottom of the pin mounting groove and the pin. The strong spring keeps the pin in the pop-out state. After the two fracturing tubes are screwed together, the end of the pin can extend out of the pin mounting groove and insert into the pin locking hole on the end face of the adjacent fracturing tube, which can prevent the two fracturing tubes from being unscrewed so as to achieve forward and reverse rotation.

[0011] Specifically, the axial ejection pin mechanism is provided with a pin unlocking hole on the side wall of the fracturing tube to allow the unlocking mechanism to be inserted. A pin unlocking groove is provided at the rear of the pin. After the unlocking mechanism extends into the pin unlocking hole, it is inserted into the pin unlocking groove to retract the pin and unlock it. The two fracturing tube sections can then be unscrewed and disassembled.

[0012] Specifically, the locking and braking mechanism is a ratchet structure, including multiple ratchet clasps on the end face of the fracturing tube and ratchets on adjacent fracturing tube end faces; the ratchet includes ratchet teeth, ratchet springs, and ratchet chambers; the ratchet chambers are arranged at the end of the fracturing tube and can accommodate the ratchet springs and ratchet teeth, and ratchet unlocking holes are provided on the outer diameter sidewall of the fracturing tube for the unlocking mechanism to be inserted; the ratchet springs always keep the ratchet teeth in the popped-out ratchet chamber state; the front end of the ratchet teeth is densely packed fine teeth that can mesh with the fine teeth of the ratchet clasps, and the meshing fine teeth are slidable inclined surfaces in the tightening direction of the fracturing tube and blocking vertical surfaces in the disassembly direction;

[0013] During the tightening process of the two fracturing tubes, under the action of the ratchet spring retraction and extension, the dense fine teeth and the fine teeth of the ratchet locking platform slide relative to each other along the mating inclined surface. Under the action of the ratchet spring and the meshing fine teeth blocking the vertical surface, reverse locking is achieved, preventing the two fracturing tube sections from rotating in the opposite direction to unscrew. The ratchet is equipped with a ratchet unlocking groove. By inserting the unlocking mechanism into the ratchet unlocking hole and the ratchet unlocking groove, the ratchet retracts into the ratchet chamber to achieve ratchet unlocking, and the two fracturing tube sections can be rotated in the opposite direction to disassemble.

[0014] Specifically, the locking and braking mechanism is a composite wedge-type latch locking structure, including a latch chamber located on the inner front sealing surface of the rear end of the fracturing tube and a composite wedge-type latch inside it; the latch chamber is an externally open chamber with a narrow inner side and a large outer side; the composite wedge-type latch includes a movable latch, a U-shaped latch body, a special-shaped wedge, a latch body spring, and a wedge spring;

[0015] The tongue spring is placed on the tongue chamber step, and the U-shaped tongue body is located at one end of the tongue spring and can extend out of the tongue chamber. A movable tongue is hinged at one end of the U-shaped tongue body. The shaped wedge includes a shaped wedge tail extending out of the bottom of the U-shaped tongue body, a shaped wedge head and a shaped wedge block located inside the U-shaped tongue body, and a shaped wedge head pin at its end. The wedge spring is sleeved on the shaped wedge and located between the bottom surface of the U-shaped tongue body and the end face of the shaped wedge head and the shaped wedge block. The outer inclined surface of the movable tongue matches the oblique flare of the tongue chamber in the tightening direction of the short rotary groove of the fracturing tube, and the inner inclined surface of the movable tongue matches the inclined surface of the shaped wedge head and the shaped wedge block. When the rotary locking boss is screwed into the wide groove short rotary inner locking buckle, it can press the movable tongue to retract the shaped wedge and the U-shaped tongue body.

[0016] The outer wall of the fracturing tube is provided with an unlocking hole. The unlocking mechanism is inserted into the unlocking hole to pull back the irregular wedge, and then drive the U-shaped chuck body to retract, so that the composite wedge chuck is retracted into the chuck chamber as a whole. The two fracturing tube sections can be rotated in opposite directions for disassembly.

[0017] A quick-connect locking forward and reverse reversible coal mine fracturing pipe unlocking mechanism is provided. This unlocking mechanism can unlock the quick-connect locking forward and reverse reversible coal mine fracturing pipe. It includes an unlocking claw frame, an unlocking claw shaft hole and a curved slide rail on the unlocking claw frame, a claw arm shaft on the curved slide rail, left and right claw arms on the claw arm shaft, a short claw hand and a long claw hand connected to the left and right claw arms and hinged to each other, and unlocking blocks on the short claw hand and the long claw hand. The unlocking blocks can be matched with the unlocking methods of the fracturing pipe to install magnetic unlocking, column pin unlocking, ratchet pin unlocking, and wedge tongue pin unlocking.

[0018] Specifically, the unlocking mechanism is mounted on the slide rail beam through the shaft hole and can slide left and right along the slide rail beam. The slide rail beam is connected to the slide rail straight beam and can slide back and forth along the slide rail straight beam. The slide rail straight beam is matched and fixed with the drilling rig and can drive the slide rail beam to rotate around the shaft.

[0019] Compared with the prior art, the present invention has the following technical effects:

[0020] This invention achieves a quick and sealed connection of the fracturing tube with a short twist, while avoiding the problem of easy self-loosening of the fracturing tube with a short twist. The locking mechanism achieves continuous locking of the fracturing tube, the fine-tooth progressive mechanism achieves stepped anti-wear locking, and the expansion wedge achieves anti-wear continuous locking of the fracturing tube, ensuring long-term sealed use of the fracturing tube. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a radial pin-locking sealing joint.

[0022] Figure 2 This is a schematic diagram of an axial pin-locking sealing joint.

[0023] Figure 3 This is a schematic diagram of a ratchet anti-lock sealing joint.

[0024] Figure 4 The diagram shows the composite wedge-type latch locking structure: a. Composite wedge-type latch locking structure in the pop-up locking state; b. Composite wedge-type latch locking structure in the unlocked state; c. Composite wedge-type latch locking structure in the unlocked retracted state.

[0025] Figure 5 This is a schematic diagram of the unlocking mechanism.

[0026] Figure 6 This is a schematic diagram showing the installation of the unlocking mechanism slide rail in conjunction with the drilling rig.

[0027] The meanings of the labels in the diagram are as follows:

[0028] 1-1. Rear end of fracturing tube; 1-2. Inner front sealing surface; 1-3. Radial ejector pin mechanism; 1-4. Wide groove short internal snap-fit; 1-5. Radial pin mounting hole; 1-6. Magnetic sleeve; 1-7. Pin cap; 1-8. Radial spring; 1-9. Radial pin; 1-10. Sealing ring; 1-11. Sealing groove; 1-12. Snap-fit ​​boss; 1-13. Snap-fit ​​boss groove.

[0029] 2-1. Pin unlocking hole; 2-2. Axial pop-out pin mechanism; 2-3. Pin unlocking groove; 2-4. Pin locking hole;

[0030] 3-1. Ratchet locking platform; 3-2. Reverse locking ratchet; 3-3. Ratchet unlocking hole; 3-4. Fine teeth of the ratchet locking platform; 3-5. Dense fine teeth; 3-6. Ratchet; 3-7. Ratchet unlocking groove; 3-8. Ratchet spring; 3-9. Ratchet compartment.

[0031] 4-1 Unlocking hole; 4-2 Composite wedge latch; 4-5 Latch compartment; 4-6 Irregular wedge tail; 4-7 Latch spring; 4-8 U-shaped latch body; 4-9 Movable latch; 4-10 Irregular wedge head ejector pin; 4-11 Irregular wedge head irregular wedge block; 4-12 Wedge spring;

[0032] 5-1. Unlocking claw shaft hole; 5-2. Claw arm shaft; 5-3. Curved slide rail; 5-4. Unlocking claw holder; 5-5. Long claw arm; 5-6. Unlocking block; 5-7. Short claw arm; 5-8. Left and right claw arms.

[0033] 6-1. Slide rail straight beam; 6-2. Slide rail cross beam; 6-3. Unlocking mechanism; 6-4. Fracturing pipe. Detailed Implementation

[0034] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0035] Example:

[0036] like Figures 1 to 6 As shown, this embodiment provides a quick-connect locking forward and reverse reversible coal mine fracturing pipe. The fracturing pipe is a hollow pipe, and multiple hollow pipe sections can be connected end to end. Each fracturing pipe section has circumferentially distributed rotating bosses 1-12 on the front side wall and circumferentially distributed wide-groove short rotating inner buckles 1-4 on the rear inner side wall. After the front and rear ends of two adjacent fracturing pipe sections are joined, they are locked by short rotation through the rotating bosses 1-12 and the wide-groove short rotating inner buckles 1-4. The front side wall of the fracturing pipe also has a sealing groove 1-11 located in front of the rotating bosses 1-12, and a sealing ring 1-10 is installed in the sealing groove 1-11. The inner side wall of the rear end 1-1 of the fracturing pipe has an inner front sealing surface 1-2 located in front of the wide-groove short rotating inner buckles 1-4. After the adjacent fracturing pipe sections are joined and tightened, the sealing ring 1-10 and the inner front sealing surface 1-2 cooperate to achieve a seal. A locking and braking mechanism is provided at the front or rear joint of the fracturing pipe.

[0037] The wide-groove short-rotating inner buckle 1-4 is an L-shaped boss, including a circumferential boss and an end-limiting boss at one end; the rotating boss 1-12 is located between the rotating boss groove 1-13; when the front end of the rear fracturing tube is inserted into the rear end of the front fracturing tube, the rotating boss 1-12 can be axially inserted from the gap between two adjacent wide-groove short-rotating inner buckles 1-4, and after rotating, it is locked in the space enclosed by the circumferential boss and the end-limiting boss of the wide-groove short-rotating inner buckle 1-4 and the inner front sealing surface 1-2.

[0038] For the locking and braking mechanism, one option is to install several sets of radial or axial ejector pins at equal angles around the rear end of the fracturing tube, such as... Figure 1 , Figure 2 As shown; the second option involves setting several sets of anti-locking ratchet structures at the contact surfaces of the two ends of the fracturing tube, including ratchet blocks and anti-locking ratchets, such as... Figure 3 As shown; the third option is to install several composite wedge-type latching structures at the rear end of the fracturing tube, including composite wedge-type latches and latch chambers, such as... Figure 4 As shown.

[0039] The locking and braking mechanism is a radial ejection pin mechanism 1-3, including a radial pin 1-9, a radial spring 1-8, and a pin cover 1-7. The radial ejection pin mechanism 1-3 is located at the radial pin mounting hole 1-5 on the side wall of the rear end 1-1 of the fracturing tube. The pin cover 1-7 is installed at the outer end of the radial pin mounting hole 1-5. The radial spring 1-8 is located between the pin cover 1-7 and the radial pin 1-9. The radial pin 1-9 can extend out of the inner end of the radial pin mounting hole 1-5 into the fracturing tube. After the front and rear fracturing tube sections are tightened, the radial pin 1-9 ejects from the groove 1-13 of the locking boss, which can prevent the two fracturing tube sections from being unscrewed so that forward and reverse rotation can be achieved. More specifically, the number of radial pop-out pin mechanisms, rotating locking bosses, and wide-groove short internal locking buckles is the same. In this embodiment, three sets of radial pop-out pin mechanisms are provided, evenly distributed along the circumference of the fracturing tube. In other embodiments, other numbers of radial pop-out pin mechanisms can be set according to actual needs to achieve the function of preventing the two sections of fracturing tube from being unscrewed.

[0040] The tail end of the radial pin 1-9 is made of magnetic material. A magnetic shielding sleeve 1-6 is fitted on the radial pin 1-9. The magnetic shielding sleeve 1-6 isolates the radial pin 1-9 from the fracturing tube. The unlocking mechanism 6-3 with a strong magnet is attached to the outer diameter side of the rear end 1-1 of the fracturing tube, which can lift and retract the radial pin 1-9 to unlock it, so that the two sections of the fracturing tube can be unscrewed and disassembled.

[0041] The locking and braking mechanism is an axial pop-out pin mechanism 2-2, which includes a strong spring and a pin. The axial pop-out pin mechanism 2-2 is located at the pin mounting groove on the end face of the fracturing tube. The strong spring is located between the bottom of the pin mounting groove and the pin. The strong spring keeps the pin in the pop-out state. After the two fracturing tubes are screwed together, the end of the pin can extend out of the pin mounting groove and insert into the pin locking hole 2-4 on the end face of the adjacent fracturing tube, which can prevent the two fracturing tubes from being unscrewed so that forward and reverse rotation can be achieved.

[0042] The axial ejection pin mechanism 2-2 is located on the side wall of the fracturing tube and has a pin unlocking hole 2-1 for inserting the unlocking mechanism 6-3. A pin unlocking groove 2-3 is provided at the rear of the pin. The unlocking mechanism 6-3 extends into the pin unlocking hole 2-1 and then into the pin unlocking groove 2-3, causing the pin to retract and unlock, so that the two sections of fracturing tube can be unscrewed and disassembled. In this embodiment, the axial ejection pin mechanism is located at the rear end 1-1 of the fracturing tube. In other embodiments, the axial ejection pin can also be located at the front end of the fracturing tube.

[0043] The locking and braking mechanism is a ratchet structure, including multiple ratchet chocks 3-1 on the end face of the fracturing tube and ratchet 3-2 on the end faces of adjacent fracturing tubes. The ratchet 3-2 includes ratchet 3-6, ratchet spring 3-8, and ratchet chamber 3-9. The ratchet chamber 3-9 is located at the end of the fracturing tube and can accommodate the ratchet spring 3-8 and ratchet 3-6. A ratchet unlocking hole 3-3 is provided on the outer diameter side wall of the fracturing tube so that the unlocking mechanism 6-3 can be inserted. The ratchet spring 3-8 always keeps the ratchet 3-6 in the popped-out state of the ratchet chamber 3-9. The front end of the ratchet 3-6 is a dense fine tooth 3-5 that can mesh with the fine teeth 3-4 of the ratchet chock. The meshing fine teeth are a sliding inclined surface in the tightening direction of the fracturing tube and a blocking vertical surface in the disassembly direction.

[0044] During the tightening process of the two fracturing tubes, under the retraction and extension action of the ratchet spring 3-8, the dense fine teeth 3-5 and the ratchet locking fine teeth 3-4 slide relative to each other along the mating inclined surface. Under the action of the ratchet spring 3-8 and the meshing fine teeth blocking the vertical surface, reverse locking is achieved, preventing the two fracturing tube sections from rotating in the opposite direction to unscrew. The ratchet 3-6 is provided with a ratchet unlocking groove 3-7. By inserting the unlocking mechanism 6-3 into the ratchet unlocking hole 3-3 and the ratchet unlocking groove 3-7, the ratchet 3-6 is retracted into the ratchet chamber 3-9 to unlock the ratchet 3-6, and the two fracturing tube sections can then be disassembled by rotating in the opposite direction.

[0045] The locking and braking mechanism is a composite wedge-type latch locking structure, including a latch chamber 4-5 located on the inner front sealing surface 1-2 and a composite wedge-type latch 4-2 inside it; the latch chamber 4-5 is an outer opening chamber with a narrow inner side and a large outer side; the composite wedge-type latch 4-2 includes a movable latch 4-9, a U-shaped latch body 4-8, a special-shaped wedge, a latch body spring 4-7, and a wedge spring 4-12.

[0046] The tongue spring 4-7 is placed on the step of the tongue chamber 4-5, providing a pre-set elastic force to eject the composite wedge-shaped tongue as a whole. The U-shaped tongue body 4-8 is located at one end of the tongue spring 4-7 and can extend out of the tongue chamber 4-5. A movable tongue 4-9 is hinged to one end of the U-shaped tongue body 4-8. The irregular wedge includes an irregular wedge tail 4-6 extending out of the bottom of the U-shaped tongue body 4-8, an irregular wedge head 4-11 located inside the U-shaped tongue body 4-8, and an irregular wedge head ejector pin 4-10 at its end; the wedge bullet Spring 4-12 is fitted onto the shaped wedge and located between the bottom surface of the U-shaped latch body 4-8 and the end face of the shaped wedge block 4-11 at the head of the shaped wedge; the outer bevel of the movable latch 4-9 matches the oblique flare of the latch chamber 4-5 in the tightening direction of the short rotary groove of the fracturing tube, and the inner bevel of the movable latch 4-9 matches the bevel of the shaped wedge block 4-11 at the head of the shaped wedge; when the rotary latch boss 1-12 is screwed into the wide groove short rotary inner latch 1-4, it can press the movable latch 4-9 to retract the shaped wedge and the U-shaped latch body 4-8.

[0047] The irregular wedge consists of two parts: a head and a tail. The tail end has an unlocking hook, while the front end passes through the bottom of the U-shaped latch body and through the wedge spring, then is threaded to the rear end of the head. The rear end of the head is an irregular wedge block that can push the movable latch outwards. The front end of the head is a pin that can be pressed by the front end of the fracturing tube to retract the irregular wedge and the composite wedge latch. The wedge spring is placed in the U-shaped latch body to provide pre-set elasticity so that the irregular wedge pops outwards. The movable latch is hinged to the U-shaped latch body and can be pushed outwards by the irregular wedge. In conjunction with the oblique flare of the latch chamber, it can keep the two sections of fracturing tube in a reverse locking state at all times.

[0048] The outer wall of the fracturing tube is provided with an unlocking hole 4-1. The unlocking mechanism 6-3 is inserted into the unlocking hole 4-1 to pull back the irregular wedge, and then drive the U-shaped clasp body 4-8 to retract, so that the composite wedge clasp 4-2 is retracted into the clasp chamber 4-5 as a whole. The two fracturing tubes can then be rotated in opposite directions for disassembly.

[0049] This invention also provides a quick-connect locking mechanism for unlocking coal mine fracturing pipes with forward and reverse rotation, such as... Figure 5 The unlocking mechanism 6-3 can unlock the quick-connect locking forward and reverse coal mine fracturing pipe of claim 2; it includes an unlocking claw frame 5-4, an unlocking claw shaft hole 5-1 and a curved slide rail 5-3 provided on the unlocking claw frame 5-4, a claw arm shaft 5-2 provided on the curved slide rail 5-3, left and right claw arms 5-8 provided on the claw arm shaft 5-2, a short claw hand 5-7 and a long claw hand 5-5 respectively connected to and hinged to the left and right claw arms 5-8, and an unlocking block 5-6 provided on the short claw hand 5-7 and the long claw hand 5-5; the unlocking block 5-6 can be installed with magnetic unlocking, column pin unlocking, ratchet pin unlocking and wedge tongue pin unlocking to match the unlocking method of the fracturing pipe.

[0050] Specifically, the left and right claw arms are connected to the unlocking claw holder via a curved slide rail via a claw arm shaft, allowing the unlocking claw to slide along the curved slide rail. The left and right claw arms are hinged to the long and short claw hands, allowing the long and short claw hands to open or close. Unlocking blocks are installed on the long and short claw hands, and the unlocking methods compatible with fracturing tubes can include magnetic unlocking, column-type pin unlocking, ratchet pin unlocking, and wedge-type latch pin unlocking.

[0051] The unlocking mechanism 6-3 is mounted on the slide rail beam 6-2 through a shaft hole and can slide left and right along the slide rail beam 6-2. The slide rail beam 6-2 is connected to the slide rail straight beam 6-1 and can slide back and forth along the slide rail straight beam 6-1. The slide rail straight beam 6-1 is matched and fixed to the drilling rig and can drive the slide rail beam 6-2 to rotate around the axis at a certain angle. Figure 6 More specifically, the slide rail straight beam is matched and fixed to the drilling rig. A slide rail crossbeam is mounted on the slide rail straight beam. The slide rail straight beam can drive the slide rail crossbeam to rotate around an axis at a certain angle, as shown by line B in the diagram. The slide rail crossbeam can slide back and forth along the slide rail straight beam, as shown by line A in the diagram. An unlocking claw is mounted on the slide rail crossbeam. The unlocking claw can slide left and right along the slide rail crossbeam, as shown by line C in the diagram.

[0052] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0053] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0054] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A quick-connect locking forward and reverse reversible coal mine fracturing pipe, characterized in that, The fracturing tube is a hollow tube, and multiple hollow tube sections can be connected end to end. Each fracturing tube section has circumferentially distributed rotating locking bosses (1-12) on the front side wall and wide-groove short rotating internal locking buckles (1-4) on the rear inner side wall. After the front and rear ends of two adjacent fracturing tube sections are joined, they are locked by short-spinning and locking through the rotating locking bosses (1-12) and the wide-groove short rotating internal locking buckles (1-4). The front side wall of the fracturing tube also has a sealing groove (1-11) located in front of the rotating locking bosses (1-12), and a sealing ring (1-10) is installed in the sealing groove (1-11). The inner side wall of the rear end (1-1) of the fracturing tube has an inner front sealing surface (1-2) located in front of the wide-groove short rotating internal locking buckles (1-4). After two adjacent fracturing tube sections are joined and tightened, the sealing ring (1-10) and the inner front sealing surface (1-2) cooperate to achieve a seal. A locking and braking mechanism is provided at the front or rear joint of the fracturing tube. The wide-groove short-rotating inner buckle (1-4) includes a circumferential boss and an end-limiting boss at one end; the rotating bosses (1-12) are connected by a rotating boss groove (1-13); when the front end of the rear fracturing tube is inserted into the rear end of the front fracturing tube, the rotating boss (1-12) can be axially inserted through the gap between two adjacent wide-groove short-rotating inner buckles (1-4), and after rotation, it is locked in the space enclosed by the circumferential boss, the end-limiting boss, and the inner front sealing surface (1-2) of the wide-groove short-rotating inner buckle (1-4); The locking and braking mechanism is a radial ejector pin mechanism (1-3), including a radial pin (1-9), a radial spring (1-8), and a pin cap (1-7). The radial ejector pin mechanism (1-3) is located at the radial pin mounting hole (1-5) on the side wall of the rear end (1-1) of the fracturing tube. The pin cap (1-7) is installed at the outer end of the radial pin mounting hole (1-5). The radial spring (1-8) is located between the pin cap (1-7) and the radial pin (1-9). The radial pin (1-9) can extend out of the inner end of the radial pin mounting hole (1-5) into the fracturing tube. After the two sections of the fracturing tube are tightened, the radial pin (1-9) ejects from the groove of the locking boss (1-13), which can prevent the two sections of the fracturing tube from being unscrewed so as to achieve forward and reverse rotation. The tail end of the radial pin (1-9) is made of magnetic material. A magnetic shielding sleeve (1-6) is fitted on the radial pin (1-9). The magnetic shielding sleeve (1-6) isolates the radial pin (1-9) from the fracturing tube. The unlocking mechanism (6-3) with strong magnets is attached to the outer diameter side of the rear end (1-1) of the fracturing tube, which can lift and retract the radial pin (1-9) to unlock it, so that the two sections of the fracturing tube can be unscrewed and disassembled. The unlocking mechanism (6-3) includes an unlocking claw holder (5-4), an unlocking claw shaft hole (5-1) and a curved slide rail (5-3) on the unlocking claw holder (5-4), a claw arm shaft (5-2) on the curved slide rail (5-3), left and right claw arms (5-8) on the claw arm shaft (5-2), a short claw hand (5-7) and a long claw hand (5-5) that are respectively connected to and hinged to the left and right claw arms (5-8), and an unlocking block (5-6) on the short claw hand (5-7) and the long claw hand (5-5); the unlocking block (5-6) is compatible with the unlocking method of the fracturing tube and can be installed with magnetic unlocking, column pin unlocking, ratchet pin unlocking, and wedge tongue pin unlocking respectively.

2. The quick-connect locking forward and reverse reversible coal mine fracturing pipe as described in claim 1, characterized in that, The locking and braking mechanism is an axial pop-out pin mechanism (2-2), which includes a strong spring and a pin. The axial pop-out pin mechanism (2-2) is located at the pin mounting groove on the end face of the fracturing tube. The strong spring is located between the bottom of the pin mounting groove and the pin. The strong spring keeps the pin in the pop-out state. After the two fracturing tubes are screwed together, the end of the pin can extend out of the pin mounting groove and insert into the pin locking hole (2-4) on the end face of the adjacent fracturing tube, which can prevent the two fracturing tubes from being unscrewed so that forward and reverse rotation can be achieved.

3. The quick-connect locking forward and reverse reversible coal mine fracturing pipe as described in claim 2, characterized in that, The axial ejection pin mechanism (2-2) is located on the side wall of the fracturing tube and has a pin unlocking hole (2-1) for inserting the unlocking mechanism (6-3). A pin unlocking groove (2-3) is provided at the rear of the pin. After the unlocking mechanism (6-3) extends into the pin unlocking hole (2-1), it is inserted into the pin unlocking groove (2-3) to retract the pin and unlock it. The two fracturing tube sections can then be unscrewed and disassembled.

4. The quick-connect locking forward and reverse reversible coal mine fracturing pipe as described in claim 1, characterized in that, The locking and braking mechanism is a ratchet structure, including multiple ratchet chucks (3-1) on the end face of the fracturing tube and ratchets (3-2) on adjacent fracturing tube end faces. The ratchet (3-2) includes ratchet (3-6), ratchet spring (3-8), and ratchet chamber (3-9). The ratchet chamber (3-9) is located at the end of the fracturing tube and can accommodate the ratchet spring (3-8) and ratchet (3-6). A ratchet unlocking hole (3-3) is provided on the outer diameter side wall of the fracturing tube to allow the unlocking mechanism (6-3) to be inserted. The ratchet spring (3-8) always keeps the ratchet (3-6) in the popped-out state of the ratchet chamber (3-9). The front end of the ratchet (3-6) is a dense fine tooth (3-5) that can mesh with the fine teeth (3-4) of the ratchet chuck. The meshing fine teeth are a sliding inclined surface in the tightening direction of the fracturing tube and a blocking vertical surface in the disassembly direction. During the tightening process of the two fracturing tubes, under the retraction and extension action of the ratchet spring (3-8), the dense fine teeth (3-5) and the ratchet locking fine teeth (3-4) slide relative to each other along the mating inclined surface. Under the action of the ratchet spring (3-8) and the meshing fine teeth blocking the vertical surface, reverse locking is achieved, preventing the two fracturing tubes from rotating in the opposite direction to unscrew. The ratchet (3-6) is provided with a ratchet unlocking groove (3-7). By inserting the unlocking mechanism (6-3) into the ratchet unlocking hole (3-3) and the ratchet unlocking groove (3-7), the ratchet (3-6) retracts into the ratchet chamber (3-9) to unlock the ratchet (3-6), and the two fracturing tubes can then be disassembled by rotating in the opposite direction.

5. The quick-connect locking forward and reverse reversible coal mine fracturing pipe as described in claim 1, characterized in that, The locking and braking mechanism is a composite wedge-type latch locking structure, including a latch chamber (4-5) located on the inner front sealing surface (1-2) and a composite wedge-type latch (4-2) inside it; the latch chamber (4-5) is an outer opening chamber with a narrow inner side and a large outer side; the composite wedge-type latch (4-2) includes a movable latch (4-9), a U-shaped latch body (4-8), a special-shaped wedge, a latch body spring (4-7), and a wedge spring (4-12). The tongue spring (4-7) is placed on the step of the tongue chamber (4-5), and the U-shaped tongue body (4-8) is located at one end of the tongue spring (4-7) and can extend out of the tongue chamber (4-5). A movable tongue (4-9) is hinged at one end of the U-shaped tongue body (4-8). The irregular wedge includes an irregular wedge tail (4-6) extending out of the bottom of the U-shaped tongue body (4-8), an irregular wedge head (4-11) located inside the U-shaped tongue body (4-8), and an irregular wedge head pin (4-10) at its end; and a wedge spring (4-12). It is fitted onto the shaped wedge and located between the bottom surface of the U-shaped latch body (4-8) and the end face of the shaped wedge head (4-11); the outer bevel of the movable latch (4-9) matches the oblique flare of the latch chamber (4-5) in the tightening direction of the short rotary groove of the fracturing pipe, and the inner bevel of the movable latch (4-9) matches the bevel of the shaped wedge head (4-11); when the rotary latch boss (1-12) is screwed into the wide groove short rotary inner latch (1-4), it can press the movable latch (4-9) to retract the shaped wedge and the U-shaped latch body (4-8); The outer wall of the fracturing tube is provided with an unlocking hole (4-1). The unlocking mechanism (6-3) is inserted into the unlocking hole (4-1) to pull back the irregular wedge, and then drive the U-shaped latch body (4-8) to retract, so that the composite wedge latch (4-2) is retracted into the latch chamber (4-5) as a whole. The two fracturing tubes can then be rotated in opposite directions for disassembly.

6. The quick-connect locking forward and reverse reversible coal mine fracturing pipe as described in claim 1, characterized in that, The unlocking mechanism (6-3) is mounted on the slide rail beam (6-2) through the shaft hole and can slide left and right along the slide rail beam (6-2). The slide rail beam (6-2) is connected to the slide rail straight beam (6-1) and can slide back and forth along the slide rail straight beam (6-1). The slide rail straight beam (6-1) is matched and fixed with the drilling rig and can drive the slide rail beam (6-2) to rotate around the shaft.

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