A continuous tube multi-section detachable pressure testing joint device and a method of using the same

Abstract

The application discloses a multi-section detachable pressure test joint device for continuous pipes, which comprises a tubular joint inner core, a plurality of tubular joint extension cores which can be connected in sequence, a plate-shaped blind plate assembly, a half sleeve assembly and a plurality of lengthened sleeve assemblies which can be connected in sequence. The joint inner core is arranged in the inner hole of the composite pipe, the joint extension core is arranged in the inner hole of the composite pipe and located at the tail of the joint inner core, the half sleeve assembly is arranged on the outer layer of the composite pipe, the lengthened sleeve assembly is arranged on the outer layer of the composite pipe and the head end surface of the lengthened sleeve assembly is tightly abutted against the tail end surface of the half sleeve assembly. The multi-section detachable pressure test joint device for continuous pipes adopts the joint extension cores and the lengthened sleeve assemblies which can be connected in sequence, can effectively increase the locking length, improves the anti-sliding and anti-leakage capacity of the joint and is suitable for pressure test of joints of different pressure levels.

Description

Technical Field

[0001] This invention relates to a pipe fitting, and more specifically, to a continuous pipe multi-section detachable pressure testing joint device. Background Technology

[0002] Currently, continuous tubing pressure testing primarily uses crimped fittings or ordinary detachable fittings. Crimped fittings consist of an inner core and a sleeve, connected to the composite tubing via internal expansion and external crimping using specialized crimping equipment. For the same diameter, multiple pressure levels are available, and the length of the inner core and sleeve increases with the pressure level, requiring multiple crimped fittings. After pressure testing, the fittings cannot be reused, resulting in high testing costs and significant waste. Ordinary detachable fittings consist of a blind flange and a half-sleeve, clamping the composite tubing securely with multiple bolts. While reusable, the inner core and half-sleeve lengths are designed to accommodate different pressure levels, leading to uneven bolt tension and ineffective clamping, often resulting in leaks during testing. Furthermore, the inner surface of the clamping sleeve and the outer surface of the inner core typically use shallow triangular or rectangular grooves, failing to effectively press and embed into the composite tubing surface, resulting in poor axial force resistance and easy slippage. When ordinary detachable fittings are used for low pressure, compared to dedicated low-pressure test fittings, they are excessively long and heavy, leading to inefficient assembly and disassembly. Summary of the Invention

[0003] Therefore, it is necessary to provide a continuous pipe multi-section detachable pressure testing joint device to address the above-mentioned technical problems.

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

[0005] A multi-section detachable pressure testing joint device for continuous pipe is characterized in that it comprises a tubular joint inner core, several cascaded tubular joint extension cores, a plate-shaped blind flange assembly, a half-sleeve assembly, and several cascaded extended sleeve assemblies.

[0006] The connector core is disposed within the inner bore of the composite pipe, and the connector core is in close contact with the inner layer of the composite pipe.

[0007] The connector extension core is disposed in the inner hole of the composite tube, and the connector extension core is located at the tail end of the connector inner core. The connector extension core is detachably connected to the connector inner core, and the connector extension core is in close contact with the inner layer of the composite tube.

[0008] The blind flange assembly is disposed on the end face of the composite pipe, and the blind flange assembly is welded to the inner core of the connector.

[0009] The half-sleeve assembly is disposed on the outer layer of the composite tube, and the half-sleeve assembly is in close contact with the blind flange assembly.

[0010] The extended sleeve assembly is disposed on the outer layer of the composite tube, and the head end face of the extended sleeve assembly is tightly abutted against the tail end face of the half sleeve assembly.

[0011] As a preferred embodiment of the present invention,

[0012] The outer wall of the inner core of the connector is provided with a plurality of inner core conical teeth and a plurality of first sealing ring grooves. The inner core conical teeth compress the inner layer of the composite tube. A first O-ring is provided in the first sealing ring groove. The tail of the inner core of the connector is provided with a connecting internal thread.

[0013] The outer wall of the connector extension core is provided with several extension conical teeth and several second sealing ring grooves. The extension conical teeth compress the inner layer of the composite tube. The second sealing ring grooves are provided with second O-ring seals. The head of the connector extension core is provided with an external thread, which mates with the internal thread. The inner side of the tail of the connector extension core is provided with an extension thread, which mates with the external thread.

[0014] The blind flange assembly has a blind flange screw hole at its center.

[0015] The aforementioned split sleeve assembly includes a pair of detachable split half-sleeves. The inner wall of each split half-sleeve has several split conical teeth that press against the outer layer of the composite tube. Split legs are welded to both sides of each split half-sleeve, and each split leg has several split leg holes. A split locking lug is welded to the end of each split leg, and a pair of split ear holes are provided circumferentially around each split locking lug. Several split stiffening plates are provided between the split legs and the outer wall of the split half-sleeves.

[0016] The extended sleeve assembly includes a pair of detachable extended half-sleeves. The inner wall of the extended half-sleeves is provided with several extended conical teeth, which extrude the outer layer of the composite tube. Extended legs are welded to both sides of the extended half-sleeves, and several extended leg holes are provided on the extended legs. Extended locking lugs are welded to the ends of the extended legs, and a pair of extended lug holes are provided around the circumference of the extended locking lugs. Several extended stiffening plates are provided between the extended legs and the outer wall of the extended half-sleeves. Each of the extended half-sleeves has a pair of independent locking grooves on its outer wall, and a pair of locking groove holes are provided on each locking groove hole. Locking bolts are provided in the locking groove holes. The extended half-sleeves are connected to the half-sleeves through the locking grooves.

[0017] In a preferred embodiment of the present invention, the center of the tooth tip of the half bevel tooth coincides with the center of the tooth root of the extended bevel tooth.

[0018] In a preferred embodiment of the present invention, the half-sleeve and the extended half-sleeve are connected by a fastening assembly.

[0019] In a preferred embodiment of the present invention, the fastening assembly includes an internal hexagonal head screw, a flat washer, a spring washer, and a hexagonal nut.

[0020] In a preferred embodiment of the present invention, the axial center of the half bevel tooth profile is consistent with that of the inner core bevel tooth profile.

[0021] In a preferred embodiment of the present invention, the center of the tooth tip of the half bevel tooth coincides with the center of the tooth root of the extended bevel tooth.

[0022] In a preferred embodiment of the present invention, the inner core bevel tooth profile, the extended bevel tooth profile, the half bevel tooth profile, and the elongated bevel tooth profile all adopt a bevel angle of 20° to 30°, a tooth depth of 1.5mm to 2.5mm, and a tooth width of 13mm to 20mm.

[0023] In a preferred embodiment of the present invention, the width of the first sealing ring groove and the second sealing ring groove is 2.9mm to 3.8mm, the groove depth is 1.7mm to 2.7mm, and the cross-sectional diameter of the first O-ring and the second O-ring is 2.65mm or 3.55mm.

[0024] A method of using the aforementioned continuous pipe multi-section detachable pressure testing joint device includes the following steps:

[0025] Step S1: Install the first O-ring seal in the first sealing ring groove of the connector inner core, and install the second O-ring seal in the second sealing ring groove of the connector extension core;

[0026] Step S2: Using the internal and external threads, screw one or more extension cores onto the tail of the connector's inner core.

[0027] Step S3: Press the inner core of the connector into the inner hole of the composite pipe 10;

[0028] Step S4: Place one of the half sleeves in the half sleeve assembly onto the upper side of the outer surface of the composite tube, and fix the other half sleeve by hand and place it on the corresponding lower side of the composite tube. Then, use the fastening assembly to complete the assembly of the half sleeve assembly 1.

[0029] Step S5: Move the half sleeve assembly so that the half sleeve assembly is tightly attached to the end face of the inner core of the connector, and lock the half sleeve assembly.

[0030] Step S6: Similarly, install one or more extension sleeve assemblies on the composite pipe, and use fastening components to complete the assembly of the extension sleeve assemblies.

[0031] Step S7: Move the extended sleeve assembly so that it is close to the half sleeve assembly. Then, gently rotate the direction of the extended sleeve assembly so that the extended locking lug of the extended sleeve assembly is aligned with the half locking lug of the half sleeve assembly. Finally, lock the extended sleeve assembly.

[0032] Step S8: Install locking grooves at the half lock lug of the half sleeve assembly and the extended lock lug of the extended sleeve assembly, and insert locking groove bolts between the half lug hole and the extended lug hole.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This continuous tubing multi-section detachable pressure testing joint device uses cascaded joint extension cores and extended sleeve assemblies, which can effectively increase the locking length, improve the joint's anti-slip and anti-leakage capabilities, and adapt to joint pressure testing of different pressure levels. Attached Figure Description

[0035] To more clearly illustrate the solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0036] Figure 1 This is a cross-sectional structural schematic diagram of the continuous pipe multi-section detachable pressure testing joint device of the present invention;

[0037] Figure 2 for Figure 1 A detailed enlarged schematic diagram of region X in the cross-sectional structural schematic diagram of the multi-section detachable pressure testing joint device of the continuous pipe in the middle;

[0038] Figure 3 for Figure 1 A detailed enlarged schematic diagram of the Y region of the cross-sectional structural schematic diagram of the multi-section detachable pressure testing joint device of the continuous pipe in the middle;

[0039] Figure 4 for Figure 1 A schematic diagram of the cross-sectional structure of the inner core of the connector in the continuous tube multi-section detachable pressure testing joint device;

[0040] Figure 5 for Figure 1 A cross-sectional schematic diagram of the connector extension core of the continuous tube multi-section detachable pressure testing joint device;

[0041] Figure 6 for Figure 1 A schematic diagram of the installation and operation of the multi-section detachable pressure testing joint device for continuous tubing;

[0042] Figure 7 for Figure 6 A partial cross-sectional structural diagram of the continuous pipe multi-section detachable pressure testing joint device along line AA;

[0043] Figure 8 for Figure 6 A partial cross-sectional schematic diagram of the extended sleeve assembly of the continuous pipe multi-section detachable pressure test joint device. Implementation

[0044] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0045] like Figure 1 As shown, the continuous tube multi-section detachable pressure test joint device includes a tubular joint inner core 6, a tubular joint extension core 9, a plate-shaped blind plate assembly 5, a half sleeve assembly 1, and an extended sleeve assembly 7.

[0046] The inner core 6 of the connector is disposed in the inner hole of the composite pipe 10, and the inner core 6 of the connector is in close contact with the inner layer of the composite pipe 10.

[0047] The connector extension core 9 is disposed in the inner hole of the composite tube 10, and the connector extension core 9 is located at the tail of the connector inner core 6. The connector extension core 9 is detachably connected to the connector inner core 6, and the connector extension core 9 is in close contact with the inner layer of the composite tube 10.

[0048] The blind flange assembly 5 is disposed on the end face of the composite pipe, and the blind flange assembly 5 is welded to the inner core 6 of the connector.

[0049] The split sleeve assembly 1 is disposed on the outer layer of the composite pipe 10, and the split sleeve assembly 1 is in close contact with the blind flange assembly 5.

[0050] The extended sleeve assembly 7 is disposed on the outer layer of the composite tube 10, and the head end face of the extended sleeve assembly 7 is tightly abutted against the tail end face of the half sleeve assembly 1.

[0051] like Figure 2 and Figure 4 As shown, the outer wall of the inner core 6 of the connector is provided with a plurality of inner core conical teeth 61 and a plurality of first sealing ring grooves 62. The inner core conical teeth 61 extrude the inner layer of the composite tube 10. The first sealing ring groove 62 is provided with a first O-ring seal 63. The tail of the inner core 6 of the connector is provided with a connecting internal thread 64.

[0052] like Figure 3 and Figure 5 As shown, the outer wall of the connector extension core 9 is provided with several extended conical teeth 91 and several second sealing ring grooves 92. The extended conical teeth 91 compress the inner layer of the composite tube 10, and the second sealing ring grooves 92 are provided with second O-ring seals 11. The head of the connector extension core 9 is provided with an external thread 93, which mates with the internal thread 64. An extension thread 94 is provided on the inner side of the tail of the connector extension core 9, which mates with the external thread 93. Using the extension thread 94, the user can connect multiple connector extension cores 9 in series to complete a multi-stage connection.

[0053] The blind flange assembly 5 has a blind flange screw hole 51 at its center, which can be connected to a water inlet device or a pressure gauge device.

[0054] like Figures 6 to 8 As shown, the split sleeve assembly 1 includes a pair of detachable split half sleeves 100. The inner wall of each split half sleeve 100 has several split conical teeth 101 that press against the outer layer of the composite tube 10. Split legs 2 are welded to both sides of each split half sleeve 100. Each split leg 2 has several split leg holes 21. A split locking lug 4 is welded to the end of each split leg 2. Each split locking lug 4 has a pair of split ear holes 41 circumferentially arranged. Several split stiffening plates 3 are provided between the split leg 2 and the outer wall of the split half sleeve 100.

[0055] The extended sleeve assembly 7 includes a pair of detachable extended half-sleeves 700. The inner wall of each extended half-sleeve 700 has several extended conical teeth 701 that press against the outer layer of the composite tube 10. Extended legs 8 are welded to both sides of each extended half-sleeve 700. Each extended leg 8 has several extended leg holes 81, and an extended locking lug 702 is welded to the end of each extended leg 8. 02. A pair of extended ear holes 703 are provided on the circumference. Several extended stiffening plates 704 are provided between the extended support leg 8 and the outer wall of the extended half sleeve 700. Each extended half sleeve 700 has a pair of independent locking grooves 16 on its outer wall. Each locking groove 16 has a pair of locking groove holes 161. Locking groove bolts 17 are provided in the locking groove holes 161. The extended half sleeve 700 is connected to the half sleeve 100 through the locking grooves 16.

[0056] It should be noted that the center of the tooth tip of the half-bevel tooth profile 101 coincides with the center of the tooth root of the extended bevel tooth profile 91. The half-bevel tooth profile 101 of the half-sleeve assembly 1 is aligned with the axial center of the inner core bevel tooth profile 61 of the inner core 6 of the connector. In this way, the compressed part of the composite tube 10 presents an "S-shape", the composite tube 10 is subjected to uniform force, and the resistance to axial force and sealing performance are improved.

[0057] In addition, the inner core bevel tooth profile 61, the extended bevel tooth profile 91, the half bevel tooth profile 101, and the extended bevel tooth profile 701 all adopt a bevel angle of 20° to 30°, a tooth depth of 1.5mm to 2.5mm, and a tooth width of 13mm to 20mm. These deepened inner core bevel tooth profiles 61, extended bevel tooth profiles 91, and half bevel tooth profiles 101 are all used to increase the resistance to axial force, solving the problem of insufficient axial force resistance and easy slippage of ordinary joints.

[0058] The width of the first sealing ring groove 62 and the second sealing ring groove 92 is 2.9mm to 3.8mm, and the depth is 1.7mm to 2.7mm. The cross-sectional diameter of the first O-ring 63 and the second O-ring 11 is 2.65mm or 3.55mm.

[0059] The half-sleeve 100 and the extended half-sleeve 700 are both connected by a fastening assembly S.

[0060] The fastening assembly S includes a hexagonal head screw 12, a flat washer 13, a spring washer 14, and a hexagonal nut 15.

[0061] The following describes the usage of the multi-section detachable pressure testing joint device for continuous tubing, including the following steps:

[0062] Step S1: Install the first O-ring 63 in the first sealing ring groove 62 of the inner core 6 of the connector, and install the second O-ring 11 in the second sealing ring groove 92 of the extension core 9 of the connector.

[0063] Step S2: Using the internal thread 64 and the external thread 93, screw one or more extension cores 9 onto the tail of the inner core 6 of the connector.

[0064] Step S3: Press the inner core 6 of the connector into the inner hole of the composite tube 10. Note that the first O-ring 63 and the second O-ring 11 should not be twisted or dislodged.

[0065] Step S4: Place one of the half-sleeves 100 of the half-sleeve assembly 1 on the upper side of the outer surface of the composite tube 10, and fix the other half-sleeve 100 by hand and place it on the corresponding lower side of the composite tube 10. Then, insert the internal hexagonal head screw 12, flat washer 13, and spring washer 14 into the half-sleeve foot hole 21 of the half-sleeve 100, and use the hexagonal nut 15 to initially fix it, thus completing the assembly of the half-sleeve assembly 1.

[0066] Step S5: Move the half sleeve assembly 1 so that the half sleeve assembly 1 is close to the end face of the inner core 6 of the connector, and tighten each hexagonal nut 15 on the half support foot hole 21 in an orderly manner.

[0067] Step S6: According to the test pressure requirements, referring to step S4, similarly install one or more extended sleeve assemblies 7 on the composite pipe 10, and use hexagonal nuts 15 to initially fix them, thus completing the assembly of the extended sleeve assembly 7.

[0068] Step S7: Move the extended sleeve assembly 7 so that it is close to the half sleeve assembly 1. Then, gently rotate the direction of the extended sleeve assembly 7 so that the extended locking lug 702 of the extended sleeve assembly 7 is aligned with the half locking lug 4 of the half sleeve assembly 1. Finally, tighten each hexagonal nut 15 on the extended sleeve assembly 7 in an orderly manner.

[0069] Step S8: Install locking grooves 16 at the half lock lug 4 of the half sleeve assembly 1 and the extended lock lug 702 of the extended sleeve assembly 7, and insert locking groove bolts 17 between the half lug hole 41 and the extended lug hole 703 to prevent the locking grooves 16 from falling off during the test.

[0070] This continuous tubing multi-section detachable pressure testing joint device uses cascaded joint extension cores and extended sleeve assemblies, which can effectively increase the locking length, improve the joint's anti-slip and anti-leakage capabilities, and adapt to joint pressure testing of different pressure levels.

[0071] Not limited to this, any variations or substitutions conceived without inventive effort should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope defined in the claims.

Claims

1. A multi-section detachable pressure testing joint device for continuous pipe, characterized in that, The continuous pipe multi-section detachable pressure test joint device includes a tubular joint inner core (6), several cascaded tubular joint extension cores (9), a plate-shaped blind plate assembly (5), a half sleeve assembly (1), and several cascaded extended sleeve assemblies (7). The connector core (6) is disposed in the inner hole of the composite tube (10), and the connector core (6) is in close contact with the inner layer of the composite tube (10). The connector extension core (9) is disposed in the inner hole of the composite tube (10), and the connector extension core (9) is located at the tail of the connector inner core (6). The connector extension core (9) is detachably connected to the connector inner core (6), and the connector extension core (9) is in close contact with the inner layer of the composite tube (10). The blind flange assembly (5) is disposed on the end face of the composite pipe, and the blind flange assembly (5) is welded to the inner core (6) of the connector. The half-sleeve assembly (1) is disposed on the outer layer of the composite pipe (10), and the half-sleeve assembly (1) is in close contact with the blind flange assembly (5). The extended sleeve assembly (7) is disposed on the outer layer of the composite tube (10), and the head end face of the extended sleeve assembly (7) tightly abuts against the tail end face of the half sleeve assembly (1). The outer wall of the inner core (6) of the connector is provided with a plurality of inner core conical teeth (61) and a plurality of first sealing ring grooves (62). The inner core conical teeth (61) extrudes the inner layer of the composite tube (10). The first sealing ring groove (62) is provided with a first O-ring (63). The tail of the inner core (6) of the connector is provided with a connecting internal thread (64). The outer wall of the connector extension core (9) is provided with a plurality of extension conical teeth (91) and a plurality of second sealing ring grooves (92). The extension conical teeth (91) compress the inner layer of the composite tube (10). The second sealing ring grooves (92) are provided with a second O-ring seal (11). The head of the connector extension core (9) is provided with a connecting external thread (93), which mates with the connecting internal thread (64). The inner side of the tail of the connector extension core (9) is provided with an extension thread (94), which mates with the connecting external thread (93). The blind plate assembly (5) is provided with a blind plate screw hole (51) at its center. The half-sleeve assembly (1) includes a pair of detachable half-sleeves (100). The inner wall of the half-sleeves (100) is provided with several half-conical teeth (101). The half-conical teeth (101) extrude the outer layer of the composite tube (10). Half-legs (2) are welded on both sides of the half-sleeves (100). Several half-leg holes (21) are provided on the half-legs (2). Half-locking ears (4) are welded to the ends of the half-legs (2). A pair of half-ear holes (41) are provided on the circumference of the half-locking ears (4). Several half-ribs (3) are provided between the half-legs (2) and the outer wall of the half-sleeves (100). The extended sleeve assembly (7) includes a pair of detachable extended half-sleeves (700). The inner wall of each extended half-sleeve (700) is provided with several extended conical teeth (701). The extended conical teeth (701) press against the outer layer of the composite tube (10). Extended legs (8) are welded to both sides of each extended half-sleeve (700). Each extended leg (8) is provided with several extended leg holes (81). Extended locking lugs (702) are welded to the ends of each extended leg (8). 2) A pair of extended ear holes (703) are provided in the circumferential direction. Several extended stiffening plates (704) are provided between the extended support leg (8) and the outer wall of the extended half sleeve (700). A pair of independent locking grooves (16) are provided on the outer wall of the extended half sleeve (700). A pair of locking groove holes (161) are provided on the locking groove (16). Locking bolts (17) are provided in the locking groove holes (161). The extended half sleeve (700) is connected to the half sleeve (100) through the locking groove (16).

2. The continuous pipe multi-section detachable pressure testing joint device according to claim 1, characterized in that, The center of the tooth tip of the said half bevel tooth profile (101) coincides with the center of the tooth root of the said extended bevel tooth profile (91).

3. The continuous pipe multi-section detachable pressure testing joint device according to claim 1, characterized in that, The half-sleeve (100) and the extended half-sleeve (700) are connected by a fastening assembly (S).

4. The continuous pipe multi-section detachable pressure testing joint device according to claim 3, characterized in that, The fastening assembly (S) includes an internal hexagonal head screw (12), a flat washer (13), a spring washer (14), and a hexagonal nut (15).

5. The continuous pipe multi-section detachable pressure testing joint device according to claim 1, characterized in that, The axial center of the half bevel tooth profile (101) is consistent with that of the inner core bevel tooth profile (61).

6. The continuous pipe multi-section detachable pressure testing joint device according to claim 1, characterized in that, The center of the tooth tip of the said half bevel tooth profile (101) coincides with the center of the tooth root of the said extended bevel tooth profile (91).

7. The continuous pipe multi-section detachable pressure testing joint device according to claim 1, characterized in that, The inner core bevel tooth profile (61), extended bevel tooth profile (91), half bevel tooth profile (101) and extended bevel tooth profile (701) all adopt a bevel angle of 20° to 30°, a tooth depth of 1.5mm to 2.5mm, and a tooth width of 13mm to 20mm.

8. The continuous pipe multi-section detachable pressure testing joint device according to claim 1, characterized in that, The width of the first sealing ring groove (62) and the second sealing ring groove (92) is 2.9mm to 3.8mm, and the depth is 1.7mm to 2.7mm. The cross-sectional diameter of the first O-ring (63) and the second O-ring (11) is 2.65mm or 3.55mm.

9. A method of using the multi-section detachable pressure testing joint device for continuous tubing as described in claim 4, comprising the following steps: Step S1: Install the first O-ring (63) in the first sealing ring groove (62) of the inner core (6) of the connector and install the second O-ring (11) in the second sealing ring groove (92) of the extension core (9) of the connector. Step S2: Using the internal thread (64) and the external thread (93), screw one or more extension cores (9) onto the tail of the inner core (6) of the connector. Step S3: Press the inner core (6) of the connector into the inner hole of the composite pipe (10); Step S4: Place one of the half sleeves (100) in the half sleeve assembly (1) onto the upper side of the outer surface of the composite tube (10), and fix the other half sleeve (100) by hand and place it on the corresponding lower side of the composite tube (10). Then, use the fastening assembly (S) to complete the assembly of the half sleeve assembly (1). Step S5: Move the half sleeve assembly (1) so that the half sleeve assembly (1) is close to the end face of the inner core (6) of the connector, and lock the half sleeve assembly (1). Step S6: Similarly, install one or more extended sleeve assemblies (7) on the composite pipe (10), and use fastening components (S) to complete the assembly of the extended sleeve assembly (7); Step S7: Move the extended sleeve assembly (7) so that the extended sleeve assembly (7) is close to the half sleeve assembly (1). Then, gently rotate the direction of the extended sleeve assembly (7) so that the extended locking lug (702) of the extended sleeve assembly (7) is aligned with the half locking lug (4) of the half sleeve assembly (1). Finally, lock the extended sleeve assembly (7). Step S8: Install lock grooves (16) at the half lock lug (4) of the half sleeve assembly (1) and the extended lock lug (702) of the extended sleeve assembly (7), and insert lock groove bolts (17) between the half lug hole (41) and the extended lug hole (703).

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