Combined type quick connector of brake oil replacing machine

Abstract

The utility model discloses a combined type quick connector of a brake oil replacing machine, and relates to the technical field of brake oil replacing equipment parts. The connector comprises a connector body and a connecting pipe, the connector body comprises a connector sub-pipe, a stud body and a connector cover, the connector sub-pipe is connected with the stud body and communicated with a through hole of the stud body, and the connector cover is fixedly or detachably installed on the stud body; a joint main pipe is arranged at one end, connected with the joint body, of the connecting pipe, and a joint sealing ring is arranged on the inner wall of the joint main pipe; and the joint secondary pipe can be inserted into the joint primary pipe and is hermetically connected through the joint sealing ring. The combined type quick connector of the brake oil replacing machine is an efficient, reliable and easy-to-operate device, and the working efficiency and quality of brake oil replacement can be greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of brake oil replacement equipment components, in particular to a brake oil replacement machine combined quick connector. Background Art

[0002] A brake fluid changer is a device specifically designed for replacing the brake fluid in cars. Through specific devices and processes, it extracts old brake fluid from the brake system and injects new brake fluid to ensure the normal operation and safety of the brake system. During use, a connector is needed to seal the filling hose of the changer with the brake system's brake fluid pump to ensure that no oil leaks or gas enters the brake system when the brake fluid is replaced. In addition, due to the wide variety of vehicles, the size and specifications of the brake fluid pump ports of vehicles of different brands and models are also different. Therefore, a quick connector is needed that can be installed at the brake fluid pump interface of different vehicles, so that the brake fluid changer can be sealed and connected to the brake fluid pump to achieve the purpose of quickly changing the brake fluid. Utility Model Content

[0003] In order to solve the technical problems raised in the background technology, a brake fluid changing machine combined quick connector is provided.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a brake fluid changer combined quick connector, comprising a joint body and a connecting pipe, the joint body comprising a joint sub-tube, a stud body and a joint cover, the joint sub-tube being connected to the stud body and communicating with the through hole of the stud body, the joint cover being fixedly or detachably mounted on the stud body; a joint mother tube being provided at one end of the connecting pipe connected to the joint body, a joint sealing ring being provided on the inner wall of the joint mother tube; the joint sub-tube being able to be inserted into the joint mother tube and being sealed and connected through the joint sealing ring.

[0005] As a further solution of the present invention: a mother pipe retaining ring is provided at the end of the outer wall of the joint mother pipe, and a joint sleeve is mounted on the outer wall of the joint mother pipe. One end of the joint sleeve is exposed and a sleeve retaining ring is provided at the other end. The mother pipe retaining ring is located in the joint sleeve and cooperates with the sleeve retaining ring to prevent the joint sleeve from falling off the joint mother pipe; an internal thread is provided on the inner wall of the joint sleeve. When the joint sub-pipe of the joint body is inserted into the joint mother pipe of the connecting pipe, the joint sleeve can be connected to the stud body of the joint body through the internal thread.

[0006] As a further solution of the present invention: two or more claws are provided on the inner wall of the open end of the joint cover, and the claws are flush with the end surface of the open end of the joint cover or protrude outwardly from the end surface of the open end.

[0007] As a further solution of the present invention: when the joint cover is installed on the stud body in a detachable manner, the stud body includes an upper threaded portion and a lower threaded portion, the external thread of the upper threaded portion matches the internal thread of the joint sleeve; the lower threaded portion is a rotation-stop stud with at least one longitudinal section, and a cover through hole is provided on the joint cover, the shape of the cover through hole matches the shape of the outer wall of the lower threaded portion and both are non-circular cross-sections; a fixing nut is also threadedly connected to the lower threaded portion, and the fixing nut is pressed tightly above the joint cover.

[0008] As a further solution of the present invention, a frustum-shaped stopper is fixedly connected to the lower end of the stud body, and a rubber sealing cylinder is sleeved on the stud body between the joint cover and the frustum-shaped stopper.

[0009] As a further solution of the present invention: when the joint cover is fixedly installed on the stud body, an inner plug with a through hole is coaxially arranged inside the joint cover, the through hole of the inner plug is connected to the through hole of the stud body and the joint sub-tube, and an inner plug sealing ring is mounted on the outer peripheral wall of the inner plug.

[0010] As a further solution of the present invention, when the joint cover is fixedly mounted on the stud body, a circular sealing rubber pad is provided on the top of the inner wall of the joint cover; and an internal thread is provided on the inner wall of the open end of the joint cover.

[0011] As a further solution of the present invention: when the joint cover is fixedly mounted on the stud body, the stud body extends to the interior of the joint cover, and one end of the stud body inserted into the joint cover is connected to an inner plug having an inner threaded hole through an external thread, and an inner plug sealing ring is mounted on the outer peripheral wall of the inner plug; movable half-covers are respectively mounted on both sides of the stud body between the joint cover and the inner plug, and the movable half-covers are semicircular in shape, and an anti-slip arc-shaped stopper is provided on the upper part of the movable half-cover, and the anti-slip arc-shaped stopper is located in the joint cover and is blocked by the side wall of the cylinder of the joint cover, so that the movable half-cover cannot slip out from between the joint cover and the inner plug; an annular convex edge is provided on the inner side wall of the open end of the movable half-cover.

[0012] As a further solution of the utility model: it also includes a curved pipe connecting part, which includes a horizontal pipe and a vertical pipe. The ends of the horizontal pipe and the vertical pipe are connected together at an angle of 45-120 degrees, and the inner cavities of the horizontal pipe and the vertical pipe are connected; a vertical pipe sealing ring is provided on the inner wall of the vertical pipe; the joint sub-pipe can be inserted into the vertical pipe and sealed and connected through the vertical pipe sealing ring.

[0013] As a further solution of the utility model, a vertical pipe retaining ring is provided at one end of the vertical pipe away from the horizontal pipe, a joint sleeve is sleeved on the outer wall of the vertical pipe, one end of the joint sleeve is exposed and the other end is provided with a sleeve retaining ring, the vertical pipe retaining ring is located inside the joint sleeve and cooperates with the sleeve retaining ring to prevent the joint sleeve from falling off the vertical pipe; an internal thread is provided on the inner wall of the joint sleeve, when the joint sub-tube of the joint body is inserted into the vertical pipe, the joint sleeve can be connected to the stud body of the joint body through the internal thread;

[0014] An external stud is arranged on the outer peripheral wall of the transverse tube, and an external thread is arranged on the outer peripheral wall of the external stud. The external thread of the external stud matches the internal thread of the joint sleeve mounted on the joint mother pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] By setting up connector bodies with different structures, it is possible to adapt to the brake oil pump ports of vehicles of different brands and models, so that the brake oil changer can quickly establish a sealed connection with the brake system, ensuring that leakage or gas intrusion is avoided during the brake oil replacement process.

[0017] The connecting pipe and the connector body adopt a quick-release sealed plug-in structure with thread reinforcement, so that the connector body can be replaced with a structure that matches its brake oil pump according to the vehicle model, making it more convenient and reliable to use.

[0018] In summary, the brake fluid replacement machine combined quick connector described in the present invention is an efficient, reliable, and easy-to-operate device that can greatly improve the work efficiency and quality of brake fluid replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the assembled structure of the first embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the disassembled structure of the first embodiment of the present utility model;

[0021] Figure 3 This is a schematic structural diagram of the stud body in the first embodiment of the present utility model;

[0022] Figure 4 This is a schematic structural diagram of the joint cover in the first embodiment of the present invention (the claws protrude outward from the end surface of the open end of the joint cover);

[0023] Figure 5 For the utility model Figure 4 Bottom view of

[0024] Figure 6This is a schematic diagram of the axial cross-section structure of the joint cover in the first embodiment of the present utility model (the claws are flush with the end surface of the open end of the joint cover);

[0025] Figure 7 For the utility model Figure 6 Bottom view of

[0026] Figure 8 This is a structural diagram of the second embodiment of the present utility model (the inner plug protrudes outwardly from the end surface of the open end of the joint cover, and the claw protrudes outwardly from the end surface of the open end of the joint cover);

[0027] Figure 9 This is a structural diagram of the second embodiment of the present utility model (the inner plug protrudes outward from the end surface of the open end of the joint cover, and the claw is flush with the end surface of the open end of the joint cover);

[0028] Figure 10 This is a structural diagram of the second embodiment of the present utility model (the inner plug is located in the joint cover, and the claw is flush with the end surface of the open end of the joint cover);

[0029] Figure 11 This is a structural diagram of embodiment 3 of the present utility model;

[0030] Figure 12 This is a structural diagram of the fourth embodiment of the present utility model;

[0031] Figure 13 This is a schematic axial cross-sectional view of the movable half cover in the fourth embodiment of the present utility model;

[0032] Figure 14 For the utility model Figure 13 A top view of

[0033] Figure 15 This is a schematic diagram of the assembled structure of the fifth embodiment of the present utility model;

[0034] Figure 16 This is a schematic diagram of the disassembled structure of the fifth embodiment of the present invention.

[0035] In the figure: 1. connecting pipe; 101. female joint pipe; 102. joint sealing ring; 103. female pipe retaining ring; 2. joint sleeve; 201. sleeve retaining ring; 3. fixing nut; 4. joint cover; 401. claw; 402. cover through hole; 5. rubber sealing cylinder; 6. joint sub-tube; 7. stud body; 701. upper threaded part; 702. lower threaded part; 703. longitudinal section; 704. frustum-shaped block; 8. inner plug; 9. inner plug sealing ring; 10. annular sealing rubber gasket; 11. movable half cover; 1101. anti-slip arc block; 1102. annular convex edge; 12. horizontal pipe; 1201. outer stud; 13. vertical pipe; 1301. vertical pipe retaining ring; 1302. vertical pipe sealing ring. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0037] See also Figures 1 to 7 In an embodiment of the present invention, a brake fluid changing machine combined quick connector includes a joint body and a connecting pipe 1. The joint body includes a joint sub-tube 6, a stud body 7 and a joint cover 4. The joint sub-tube 6 is connected to the stud body 7 and communicates with the through hole of the stud body 7. The joint cover 4 is fixed or detachably installed on the stud body 7; a joint mother pipe 101 is provided at one end of the connecting pipe 1 connected to the joint body, and a joint sealing ring 102 is provided on the inner wall of the joint mother pipe 101; the joint sub-tube 6 can be inserted into the joint mother pipe 101 and sealed and connected through the joint sealing ring 102.

[0038] A mother pipe retaining ring 103 is provided at the end of the outer wall of the joint mother pipe 101, and a joint screw sleeve 2 is mounted on the outer wall of the joint mother pipe 101. One end of the joint screw sleeve 2 is exposed and a screw sleeve retaining ring 201 is provided at the other end. The mother pipe retaining ring 103 is located in the joint screw sleeve 2 and cooperates with the screw sleeve retaining ring 201 to prevent the joint screw sleeve 2 from falling off from the joint mother pipe 101; an internal thread is provided on the inner wall of the joint screw sleeve 2. When the joint sub-pipe 6 of the joint body is inserted into the joint mother pipe 101 of the connecting pipe 1, the joint screw sleeve 2 can be connected to the stud body 7 of the joint body through the internal thread.

[0039] Two or more claws 401 are provided on the inner wall of the open end of the joint cover 4 , and the claws 401 are flush with the end surface of the open end of the joint cover 4 or protrude outwardly from the end surface of the open end.

[0040] In this embodiment, a joint cover 4 is detachably mounted on a stud body 7. The stud body 7 includes an upper threaded portion 701 and a lower threaded portion 702. The external threads of the upper threaded portion 701 match the internal threads of the joint nut 2. The lower threaded portion 702 is a rotation-stopping stud with at least one longitudinal section 703. A cover through-hole 402 is defined in the joint cover 4. The shape of the cover through-hole 402 matches the outer wall shape of the lower threaded portion 702, and both have non-circular cross-sections. A fixing nut 3 is also threadedly connected to the lower threaded portion 702 and is tightly mounted above the joint cover 4. A frustum-shaped stopper 704 is fixedly connected to the lower end of the stud body 7. A rubber sealing sleeve 5 is mounted on the stud body 7 between the joint cover 4 and the frustum-shaped stopper 704.

[0041] In this embodiment, the connecting tube 1 serves as the filling tube or can be connected to the filling tube of a brake fluid changing machine. The connector cap 4 snaps onto the pump port of the brake fluid pump and, via the claws 401, rotates and engages the outer ridge of the pump port. The rubber sealing sleeve 5 fits tightly against the inner wall of the pump port, achieving a sealed connection between the connector body and the brake fluid pump. Once connected, the brake fluid changing machine can be activated and the oil change process can be performed according to the steps. Example 2

[0042] See also Figures 8-10 In the embodiment of the present invention, when the joint cover 4 is fixedly mounted on the stud body 7, an inner plug 8 with a through hole is coaxially arranged inside the joint cover 4. The through hole of the inner plug 8 is communicated with the through hole of the stud body 7 and the joint sub-tube 6, and an inner plug sealing ring 9 is mounted on the outer peripheral wall of the inner plug 8.

[0043] In this embodiment, the inner plug sealing ring 9 on the inner plug post 8 is tightly fitted with the inner wall of the pump port to achieve a sealed connection between the joint body and the brake oil pump.

[0044] The other structures and usage methods of this embodiment are the same as those of the first embodiment and will not be described in detail. Example 3

[0045] See also Figure 11 In the embodiment of the present invention, when the joint cover 4 is fixedly mounted on the stud body 7, a circular sealing rubber pad 10 is provided on the top of the inner wall of the joint cover 4; an internal thread is provided on the inner wall of the open end of the joint cover 4.

[0046] In this embodiment, the annular sealing rubber gasket 10 is tightly fitted to the upper end surface of the pump port to achieve a sealed connection between the joint body and the brake oil pump.

[0047] The other structures and usage methods of this embodiment are the same as those of the first embodiment and will not be described in detail. Example 4

[0048] See also Figure 12-14 In the embodiment of the present invention, when the joint cover 4 is fixedly mounted on the stud body 7, the stud body 7 extends to the interior of the joint cover 4, and one end of the stud body 7 inserted into the joint cover 4 is connected to an inner plug post 8 with an inner threaded hole through an external thread, and an inner plug sealing ring 9 is mounted on the outer peripheral wall of the inner plug post 8; movable half covers 11 are respectively mounted on both sides of the stud body 7 between the joint cover 4 and the inner plug post 8, and the movable half covers 11 are semicircular in shape, and an anti-slip arc-shaped stopper 1101 is arranged on the upper part of the movable half cover 11, and the anti-slip arc-shaped stopper 1101 is located in the joint cover 4 and is blocked by the side wall of the cylinder of the joint cover 4, so that the movable half cover 11 cannot slip out from between the joint cover 4 and the inner plug post 8; an annular convex edge 1102 is arranged on the inner side wall of the open end of the movable half cover 11

[0049] In this embodiment, the connection is first performed by rotating the joint cover 4 and the stud body 7, increasing the distance between the joint cover 4 and the inner plug 8. This allows the two movable half covers 11 to move relatively apart and engage with the outer peripheral wall of the brake pump port. Since the brake pump port is provided with an outwardly protruding annular rim, the two movable half covers 11 are then brought together. The annular ridge 1102 on each of the movable half covers 11 can clamp the outer peripheral wall of the pump port from below. The joint cover 4 is then tightened in the opposite direction, reducing the distance between the joint cover 4 and the inner plug 8 and firmly clamping the two movable half covers 11 in their engaged position, thereby completing the connection and securing the joint body to the brake fluid pump. This structure utilizes the inner plug sealing ring 9 on the inner plug 8 to tightly fit the inner wall of the pump port, achieving a sealed connection between the joint body and the brake fluid pump.

[0050] The other structures and usage methods of this embodiment are the same as those of the first embodiment and will not be described in detail. Example 5

[0051] See also Figure 15-16 In an embodiment of the utility model, a curved pipe connection portion is further included, wherein the curved pipe connection portion includes a horizontal pipe 12 and a vertical pipe 13. The ends of the horizontal pipe 12 and the vertical pipe 13 are connected together at an angle of 45-120 degrees, and the inner cavities of the horizontal pipe 12 and the vertical pipe 13 are connected; a vertical pipe sealing ring 1302 is provided on the inner wall of the vertical pipe 13; the joint sub-pipe 6 can be inserted into the vertical pipe 13 and sealed and connected through the vertical pipe sealing ring 1302.

[0052] A vertical pipe retaining ring 1301 is provided at the end of the vertical pipe 13 away from the horizontal pipe 12, and a joint screw sleeve 2 is mounted on the outer wall of the vertical pipe 13. One end of the joint screw sleeve 2 is exposed and a screw sleeve retaining ring 201 is provided at the other end. The vertical pipe retaining ring 1301 is located in the joint screw sleeve 2 and cooperates with the screw sleeve retaining ring 201 to prevent the joint screw sleeve 2 from falling off the vertical pipe 13; an internal thread is provided on the inner wall of the joint screw sleeve 2, and when the joint sub-tube 6 of the joint body is inserted into the vertical pipe 13, the joint screw sleeve 2 can be connected to the stud body 7 of the joint body through the internal thread.

[0053] An external stud 1201 is provided on the outer peripheral wall of the transverse tube 12 . An external thread is provided on the outer peripheral wall of the external stud 1201 . The external thread of the external stud 1201 matches the internal thread of the joint sleeve 2 mounted on the joint mother pipe 101 .

[0054] When in use, the horizontal tube 12 is plugged into the connecting tube 1 and then reinforced by threading the joint nut 2 provided on the connecting tube 1 with the outer stud 1201 on the horizontal tube 12. Simultaneously, the lower end of the vertical tube 13 is plugged into the joint sub-tube 6 of the joint body and then reinforced by connecting the joint nut 2 provided on the vertical tube 13 with the stud 7 of the joint body. This embodiment is used to achieve a curved connection between the joint body and the connecting tube 1.

[0055] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A brake fluid replacement machine combined quick connector, characterized in that: The invention comprises a joint body and a connecting pipe (1), wherein the joint body comprises a joint sub-pipe (6), a stud body (7) and a joint cover (4), wherein the joint sub-pipe (6) is connected to the stud body (7) and communicates with the through hole of the stud body (7); the joint cover (4) is fixedly or detachably mounted on the stud body (7); a joint mother pipe (101) is provided at one end of the connecting pipe (1) connected to the joint body, and a joint sealing ring (102) is provided on the inner wall of the joint mother pipe (101); the joint sub-pipe (6) can be inserted into the joint mother pipe (101) and sealed and connected via the joint sealing ring (102).

2. A brake fluid changing machine combined quick connector according to claim 1, characterized in that: A mother pipe retaining ring (103) is provided at the end of the outer wall of the joint mother pipe (101), and a joint screw sleeve (2) is sleeved on the outer wall of the joint mother pipe (101). One end of the joint screw sleeve (2) is open, and a screw sleeve retaining ring (201) is provided at the other end. The mother pipe retaining ring (103) is located in the joint screw sleeve (2) and cooperates with the screw sleeve retaining ring (201) to prevent the joint screw sleeve (2) from coming off the joint mother pipe (101). An internal thread is provided on the inner wall of the joint screw sleeve (2). When the joint sub-pipe (6) of the joint body is inserted into the joint mother pipe (101) of the connecting pipe (1), the joint screw sleeve (2) can be connected to the stud body (7) of the joint body through the internal thread.

3. The brake fluid changing machine combined quick connector according to claim 1, characterized in that: Two or more clamping claws (401) are provided on the inner wall of the open end of the joint cover (4), and the clamping claws (401) are flush with the end surface of the open end of the joint cover (4) or protrude outwardly from the end surface of the open end.

4. A brake fluid changing machine combined quick connector according to claim 2 or 3, characterized in that: When the joint cover (4) is detachably mounted on the stud body (7), the stud body (7) comprises an upper threaded portion (701) and a lower threaded portion (702), wherein the external thread of the upper threaded portion (701) matches the internal thread of the joint screw sleeve (2); the lower threaded portion (702) is a rotation-stop stud provided with at least one longitudinal section (703); a cover body through hole (402) is provided on the joint cover (4), the shape of the cover body through hole (402) matches the shape of the outer wall of the lower threaded portion (702) and both are non-circular cross-sections; a fixing nut (3) is also threadedly connected to the lower threaded portion (702), and the fixing nut (3) is tightly arranged above the joint cover (4).

5. The brake fluid changing machine combined quick connector according to claim 4, characterized in that: A frustum-shaped stopper (704) is fixedly connected to the lower end of the stud body (7), and a rubber sealing cylinder (5) is sleeved on the stud body (7) between the joint cover (4) and the frustum-shaped stopper (704).

6. A brake fluid changing machine combined quick connector according to claim 2 or 3, characterized in that: When the joint cover (4) is fixedly mounted on the stud body (7), an inner plug post (8) with a through hole is coaxially arranged inside the joint cover (4), the through hole of the inner plug post (8) is connected to the through hole of the stud body (7) and the joint sub-tube (6), and an inner plug sealing ring (9) is sleeved on the outer peripheral wall of the inner plug post (8).

7. The brake fluid changing machine combined quick connector according to claim 2, characterized in that: When the joint cover (4) is fixedly mounted on the stud body (7), a circular sealing rubber pad (10) is provided on the top end of the inner wall of the joint cover (4); and an internal thread is provided on the inner wall of the open end of the joint cover (4).

8. The brake fluid changing machine combined quick connector according to claim 2, characterized in that: When the joint cover (4) is fixedly mounted on the stud body (7), the stud body (7) extends into the interior of the joint cover (4), and one end of the stud body (7) inserted into the joint cover (4) is connected to an inner plug post (8) provided with an inner threaded hole through an external thread, and an inner plug sealing ring (9) is sleeved on the outer peripheral wall of the inner plug post (8); movable half covers (11) are respectively sleeved on both sides of the stud body (7) between the joint cover (4) and the inner plug post (8), and the movable half covers (11) are semicircular in shape. An anti-slip arc stopper (1101) is provided on the upper part of the movable half cover (11), and the anti-slip arc stopper (1101) is located in the joint cover (4) and is blocked by the side wall of the barrel of the joint cover (4), so that the movable half cover (11) cannot slip out from between the joint cover (4) and the inner plug post (8); an annular convex edge (1102) is provided on the inner side wall of the open end of the movable half cover (11).

9. The brake fluid changing machine combined quick connector according to claim 2, characterized in that: The device further comprises a curved pipe connection portion, the curved pipe connection portion comprising a horizontal pipe (12) and a vertical pipe (13), the ends of the horizontal pipe (12) and the vertical pipe (13) being connected together at an angle of 45-120 degrees, the inner cavities of the horizontal pipe (12) and the vertical pipe (13) being in communication; a vertical pipe sealing ring (1302) is provided on the inner wall of the vertical pipe (13); the joint sub-pipe (6) can be inserted into the vertical pipe (13) and sealed and connected via the vertical pipe sealing ring (1302).

10. The brake fluid changing machine combined quick connector according to claim 9, characterized in that: A vertical pipe retaining ring (1301) is provided at one end of the vertical pipe (13) away from the horizontal pipe (12), and a joint screw sleeve (2) is sleeved on the outer wall of the vertical pipe (13). One end of the joint screw sleeve (2) is open and a screw sleeve retaining ring (201) is provided at the other end. The vertical pipe retaining ring (1301) is located in the joint screw sleeve (2) and cooperates with the screw sleeve retaining ring (201) to prevent the joint screw sleeve (2) from coming off the vertical pipe (13). An internal thread is provided on the inner wall of the joint screw sleeve (2). When the joint sub-tube (6) of the joint body is inserted into the vertical pipe (13), the joint screw sleeve (2) can be connected to the stud body (7) of the joint body through the internal thread. An external stud (1201) is provided on the outer peripheral wall of the transverse tube (12), and an external thread is provided on the outer peripheral wall of the external stud (1201). The external thread of the external stud (1201) matches the internal thread of the joint sleeve (2) mounted on the joint mother tube (101).

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