CN110500467B - F-shaped flange joint - Google Patents

Abstract

The invention discloses an F-shaped flange joint, which comprises a tubular core rod, a buckling and pressing outer sleeve assembly and a pipe sleeve, wherein an annular positioning groove is formed in the middle of the core rod, a pull-out preventing clamping edge is arranged on the left side of the annular positioning groove, a sealing ring groove is formed in the circumferential direction of the annular positioning groove, an O-shaped sealing ring is arranged in the sealing ring groove, a rubber pipe sealing section is arranged between the annular positioning groove and the sealing ring groove, the buckling and pressing outer sleeve assembly comprises an upper part and a lower part, U-shaped handles are arranged on the upper and lower parts of the periphery of the buckling and pressing outer sleeve assembly, a hook pin capable of achieving locking is arranged on the front part of the buckling and pressing outer sleeve assembly, a long shaft is arranged between the two parts. The scheme improves the assembly mode of the joint, changes the stress state and replaces manpower with machinery; the labor intensity can be reduced, and the labor efficiency is improved; discontinuous impact load is also improved into continuous stable pressure stress; reduce the damage to the inner wall of the rubber tube and improve the product quality.

Description

F-shaped flange joint

Technical Field

The invention relates to the field of pipeline accessories, in particular to an F-shaped flange joint.

Background

The production process of the rubber tube assembly is basically consistent with that of international and domestic production lines, the tube sleeve is manually sleeved into the rubber tube with the outer rubber peeled off, then the tube core is inserted, the tube core is matched with the inner rubber of the rubber tube, the tube core is manually inserted into the tube core and needs to be knocked by a hammer to be in place due to interference fit, in the process, the rubber tube and the tube core are subjected to impact load, the tube core and the inner wall of the rubber tube generate relative accelerated motion, the rubber tube and the tube core have external force action and impact property, damage can be generated, the quality is influenced, meanwhile, manual hammering is frequent and continuous, the labor intensity is high, and the efficiency is low. The tip of current pipeline need carry out sealing connection usually, prevents the interior fluidic of pipeline from revealing, all is through welding the separation blade on flange at present, then is connected flange on flange and the pipeline, and the operation is more inconvenient, and the separation blade drops with flange easily moreover, leads to the fluid seepage.

Disclosure of Invention

The utility model provides a F type flange connects, withholds overcoat subassembly and 1 annular pipe box including 1 tubular core bar, 1 annular, the inside fluid passage that is provided with of core bar, core bar middle part are equipped with annular positioning groove, and annular positioning groove left side is equipped with prevents pulling out takes off the card arris, prevents pulling out card arris circumference and has seted up the sealing washer annular, is equipped with O shape sealing washer in the sealing washer annular, be equipped with the sealed section of rubber tube between annular positioning groove and the sealing washer annular, the core bar left end portion is equipped with the sealed annular of a plurality of parallels, withhold the overcoat subassembly and include 2 on being half tile shape withhold the overcoat and withhold the overcoat down, on withhold the overcoat: the right side is equipped with the location semi-ring, the inside spacing semi-ring card arris of being equipped with in right side, inside left end is equipped with top tube sleeve semicircular groove, seted up last semicircular groove on the horizontal plane down along the rear portion, the last handle holding tank that carries of U-shaped is seted up on the preceding upper portion of excircle, be equipped with the handle of rotatable U-shaped in it, open the front portion of excircle has the square platform that sinks on, horizontally coupler pin installation blind hole is seted up at its left facade middle part, it has the spacing hole of coupler pin card to set up down in it, it withholds that the overcoat is inside to be equipped with the acupuncture circumferentially between last location semi-ring and the last spacing semi-ring card arris: the right side is provided with a lower positioning semi-ring, the inner part of the right side is provided with a lower limiting semi-ring clamping edge, the left end of the inner part is provided with a lower pipe sleeve semi-ring groove, a lower semicircular groove is arranged on the horizontal plane at the upper edge of the rear part of the handle, a U-shaped lower handle holding groove is arranged at the lower front part of the handle, a rotatable U-shaped handle is arranged in the lifting device, a square sinking platform is arranged at the front part of the lifting device, a short pin shaft is arranged on the front left lower plane of the lifting device, a T-shaped hook pin capable of rotating around the T-shaped hook pin is arranged on the T-shaped hook pin, a downward draw hook is arranged at the right end part of the T-shaped hook pin, needling is circumferentially arranged between the clamping edges of the lower positioning semi-ring and the lower limiting semi-ring in the T-shaped hook pin, a long shaft is arranged between the upper semi-circular groove and the lower semi-circular groove, and a circular arc spring leaf is connected and installed between the lower buckling outer sleeve shell and the lower buckling outer sleeve shell, the pipe sleeve is a lantern ring with a gap on the side surface, the periphery of the right end of the pipe sleeve is circumferentially provided with a positioning edge, and the inner circumference of the pipe sleeve is circumferentially provided with a plurality of circles of parallel annular ratchets with tooth tips facing to the right.

Furthermore, the bottom width of annular constant head tank is 5mm, go up location semi-ring and location semi-ring thickness down and be 5mm, the bottom of annular constant head tank and go up location semi-ring, location semi-ring down are clearance fit.

Furthermore, the rear parts of the upper semicircular groove and the lower semicircular groove on the rear parts of the upper buckling and pressing outer sleeve and the lower buckling and pressing outer sleeve are provided with an upper inclined plane and a lower inclined plane, and the upper buckling and pressing outer sleeve and the lower buckling and pressing outer sleeve can rotate for a certain angle around the long axis without interference.

Furthermore, the spring piece is made of 65 manganese, is fixed on the peripheries of the upper buckling outer sleeve and the lower buckling outer sleeve by adopting a rivet riveting structure, and has a clamping trend in a working state; the inner diameter of the pipe sleeve in a free state is larger than the outer diameter of the rubber pipe.

Further, go up the handle holding tank and be equipped with respectively with lower handle holding tank and change spring and round pin axle, the handle rotates around the round pin axle, and the normality is for keeping flat in last handle holding tank and lower handle holding tank.

Furthermore, a downward finger hook head is arranged at the left end of the T-shaped hook pin, an upper long through hole and a lower long through hole are formed in the lower end of the T-shaped hook pin, and a pressure spring is arranged in the long through hole from the bottom to the position between the short pin shafts.

Further, the bevel angle of the ring-shaped ratchet of the pipe sleeve is 30 degrees.

Furthermore, the left vertical surface of the annular positioning groove is an inclined annular surface, and an included angle between the inclined annular surface and the central axis of the buckling outer sleeve component is 75 degrees; the left vertical surface of the upper pipe sleeve half ring groove and the lower pipe sleeve half ring groove is an inclined upper ring surface and a lower ring surface, and the included angle between the inclined angle and the central axis of the buckling and pressing outer sleeve component is 75 degrees.

Furthermore, the needling height is 10mm, and the circumference equipartition is total 4.

A method for using an F-type flange joint comprises the following steps:

(1) the pipe sleeve is sleeved at the proper position of the rubber pipe (4).

(2) And sleeving the rubber pipe sleeved with the pipe sleeve from the left end of the core rod until the left end of the rubber pipe leans against the left outer vertical surface of the annular positioning groove.

(3) The hook pin is opened, the handle on the upper buckling and pressing outer sleeve and the handle on the lower buckling and pressing outer sleeve are pulled, and the buckling and pressing outer sleeve assembly is opened to a proper angle.

(4) And aligning an upper positioning half ring and a lower positioning half ring of the crimping outer sleeve component with the annular positioning groove, and aligning an upper pipe sleeve semi-ring groove, a lower pipe sleeve semi-ring groove and the positioning edge.

(5) The outer sleeve component is buckled and buckled, after the buckling is finished, the hook pin is pulled leftwards and upwards and simultaneously rotates, the right end of the T shape of the hook pin penetrates into the blind hole for installing the hook pin,

(6) the draw hook of the hook pin is clamped into the hook pin clamping limiting hole to realize locking.

(7) And (5) when the joint needs to be opened, reversely operating the steps (3) to (6).

The invention has the following remarkable advantages:

1. improve the assembly mode of the joint (the pipe core and the pipe sleeve), change the stress state,

2. the machine replaces the manual work, the labor intensity can be reduced, the labor efficiency can be improved,

3. the intermittent impact load is improved into continuous steady pressure stress,

4. reduce the damage to the inner wall of the rubber tube and improve the product quality.

Drawings

FIG. 1: the invention has the structure of an assembly appearance structure;

FIG. 2: the explosion structure diagram of the invention;

FIG. 3: the invention relates to an explosion structure diagram of an assembled semi-finished product;

FIG. 4: the invention relates to an appearance structure diagram of a part of an assembled lower buckling outer sleeve, which comprises the following components in parts by weight:

FIG. 5: the appearance structure diagram of the upper buckling outer sleeve of the invention is as follows:

in the figure:

1. a core bar; 2. buckling the outer sleeve component; 3. pipe sleeve; 1a, a fluid channel; 1d, annular positioning grooves; 1b, preventing the clamping edge from being pulled out; 1b1, sealing ring groove; 1b1a, O-ring seal; 1f, a rubber pipe sealing section; 1e, sealing a ring groove; 2a, buckling and pressing an outer sleeve; 2b, pressing the outer sleeve downwards; 2a1, upper positioning half ring; 2a2, upper limiting semi-ring clamping ribs; 2a3, an upper pipe sleeve half-ring groove; 2a4, upper semicircular groove; 2a5, lifting handle accommodating groove; 2a6, a handle; 2a7, upper sinking platform; 2a8, a blind hook pin mounting hole; 2a8a, a latch catch limiting hole; 2a12, needling; 2b1, lower positioning half ring; 2b2, lower limiting semi-ring clamping ribs; 2b3, lower pipe sleeve half-ring groove; 2b4, lower semicircular groove; 2b5, a lower handle accommodating groove; 2a6, a handle; 2b7, sink deck; 2b8, short pin shaft; 2b9, hook pin; 2b9b, hook; 2c, a long axis; 2d, spring pieces, 3a and gaps; 3b, positioning edges; 3c, ratchets; 2a9, inclined plane; 2b10, lower bevel; 2e, riveting; 2a10, rotary spring; 2a11 and a pin shaft 6; 2b9a finger hook; 2b9c, long through hole; 2b9d, pressure spring; 1d1, torus; 2a3a, upper torus; 2b3a, lower torus;

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

With reference to fig. 1, 2, 3, 4, and 5, an embodiment of the present invention provides an F-type flange joint, including 1 tubular core rod 1, 1 annular buckling and pressing outer sleeve assembly 2, and 1 annular pipe sleeve 3, where a fluid channel 1a is provided inside the core rod 1, an annular positioning groove 1d is provided in the middle of the core rod 1, an anti-pulling and anti-releasing rib 1b is provided on the left side of the annular positioning groove 1d, a sealing ring groove 1b1 is circumferentially provided on the anti-pulling and anti-releasing rib 1b, an O-shaped sealing ring 1b1a is provided in the sealing ring groove 1b1, a rubber tube sealing section 1F is provided between the annular positioning groove 1d and the sealing ring groove 1b1, a plurality of parallel sealing ring grooves 1e are provided at the left end of the core rod 1, the buckling and pressing outer sleeve assembly 2 includes 2 upper buckling and pressing outer sleeves 2a and lower buckling and pressing outer sleeves 2b, where each is in a half tile: the right side is equipped with location semi-ring 2a1 on, the inside spacing semi-ring card arris 2a2 of being equipped with in right side, inside left end is equipped with upper tube cover semicircular groove 2a3, the rear portion has seted up on the horizontal plane along last semicircular groove 2a4 down, the preceding upper portion of excircle has seted up the last handle holding tank 2a5 of U-shaped, the handle 2a6 of rotatable U-shaped is equipped with in it, the front portion of excircle is opened has square last heavy platform 2a7, horizontal hook pin installation blind hole 2a8 is seted up at its left facade middle part, in it has seted up hook pin card spacing hole 2a8a down, go up withhold overcoat 2a inside last location semi-ring 2a1 and be equipped with acupuncture 2a12 between spacing semi-ring card arris 2a2 on the circumference, withhold overcoat 2b down: the right side is provided with a lower positioning half ring 2b1, the inside of the right side is provided with a lower limiting half ring clamping edge 2b2, the left end of the inside is provided with a lower casing half ring groove 2b3, the rear part of the inside is provided with a lower semi-circular groove 2b4 along the horizontal plane, the front lower part of the inside is provided with a U-shaped lower handle accommodating groove 2b5 which is internally provided with a rotatable U-shaped handle 2a6, the front part of the inside is provided with a square sinking platform 2b7, the front left lower plane of the inside is provided with a short pin shaft 2b8 which is provided with a T-shaped hook pin 2b9 which can rotate around the hook pin, the right end part of the hook pin 2b9T is provided with a downward draw hook 2b9b, the inside is circumferentially provided with a needling 2a12 between the lower positioning half ring 2b1 and the lower limiting half ring clamping edge 2b2, a long shaft 2c is arranged between the upper semi-circular groove 2a4 and the lower semi-circular groove 2b4, the shell is connected with a, the periphery of the right end of the pipe sleeve 3 is circumferentially provided with a positioning edge 3b, and the inner circumference of the pipe sleeve 3 is circumferentially provided with a plurality of circles of parallel annular ratchets 3c with tooth tips facing to the right.

With reference to fig. 3, further, the width of the bottom of the annular positioning groove 1d is 5mm, the thickness of the upper positioning half ring 2a1 and the lower positioning half ring 2b1 is 5mm, and the bottom of the annular positioning groove 1d is in clearance fit with the upper positioning half ring 2a1 and the lower positioning half ring 2b 1.

With reference to fig. 3, 4 and 5, further, the upper buckling outer casing 2a and the lower buckling outer casing 2b are provided with an upper inclined surface 2a9 and a lower inclined surface 2b10 at the rear portions of the upper semicircular groove 2a4 and the lower semicircular groove 2b4, and the upper buckling outer casing 2a and the lower buckling outer casing 2b can rotate around the long axis 2c by a certain angle without interference.

With reference to fig. 1, 2 and 3, further, the spring plate 2d is made of 65 mn, and is fixed to the peripheries of the upper buckling outer sleeve 2a and the lower buckling outer sleeve 2b by a rivet 2e riveting structure, and the working state is a clamping tendency; the inner diameter of the pipe sleeve 3 in a free state is larger than the outer diameter of the rubber pipe 4.

With reference to fig. 1, 2, and 3, the upper handle receiving groove 2a5 and the lower handle receiving groove 2b5 are respectively provided with a rotating spring 2a10 and a pin 2a11, and the handle 2a6 rotates around the pin 2a11 and normally lies in the upper handle receiving groove 2a5 and the lower handle receiving groove 2b 5.

With reference to fig. 1, 2 and 4, a downward finger hook 2b9a is provided at the left end of the hook pin 2b9T, an upper and lower long through hole 2b9c is provided at the lower end of the hook pin 2b9T, and a pressure spring 2b9d is installed between the bottom of the long through hole 2b9c and the short pin shaft 2b 8.

Referring to fig. 2, further, the angle of the slope of the ring-shaped ratchet 3c of the socket 3 is 30 degrees.

With reference to fig. 2, 3 and 4, further, the left vertical surface of the annular positioning groove 1d is an inclined circular ring surface 1d1, and the included angle between the inclined circular ring surface 1d1 and the central axis of the jacket buckling component 2 is 75 degrees; the left vertical surfaces of the upper pipe sleeve half ring groove 2a3 and the lower pipe sleeve half ring groove 2b3 are an inclined upper circular ring surface 2a3a and a lower circular ring surface 2b3a, and the included angle between the inclined angle and the central axis of the buckling outer sleeve component 2 is 75 degrees.

With reference to fig. 2, 3, 4 and 5, the needles 2a12 have a height of 10mm, are circumferentially and uniformly distributed, and have a total of 4.

A method for using an F-type flange joint comprises the following steps:

(1) the pipe sleeve 3 is sleeved at a proper position of the rubber pipe 4.

(2) And sleeving the rubber tube 4 sleeved with the tube sleeve 3 from the left end of the core rod 1 until the left end leans against the left outer vertical surface of the annular positioning groove 1 d.

(3) The hook pin 2b9 is opened and the snap jacket assembly 2 is opened to the proper angle by pulling on the handle 2a6 on the upper snap jacket 2a and the handle 2a6 on the lower snap jacket 2 b.

(4) The upper retainer half ring 2a1 and the lower retainer half ring 2b1 of the crimping outer jacket assembly 2 are aligned with the annular retaining groove 1d, while the upper jacket half ring groove 2a3, the lower jacket half ring groove 2b3 and the retaining rib 3b are also aligned.

(5) The buckling and pressing outer sleeve component 2 is buckled, after the buckling is finished, the hook pin 2b9 is pulled leftwards and upwards and rotates at the same time, the right end of the line of 9T of the hook pin 2b penetrates into the blind hole 2a8 of the hook pin installation,

(6) the hook 2b9b of the hook pin 2b9 is clamped into the hook pin clamping limiting hole 2a8a, and locking is achieved.

(7) And (5) when the joint needs to be opened, reversely operating the steps (3) to (6).

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. An F-type flange joint, characterized in that: comprises 1 tubular core rod (1), 1 annular buckling and pressing outer sleeve component (2) and 1 annular pipe sleeve (3), wherein a fluid channel (1a) is arranged inside the core rod (1), an annular positioning groove (1 d) is arranged in the middle of the core rod (1), an anti-pulling and releasing clamping edge (1 b) is arranged on the left side of the annular positioning groove (1 d), a sealing ring groove (1 b 1) is circumferentially arranged on the anti-pulling and releasing clamping edge (1 b), an O-shaped sealing ring (1 b 1a) is arranged in the sealing ring groove (1 b 1), a rubber pipe sealing section (1 f) is arranged between the annular positioning groove (1 d) and the sealing ring groove (1 b 1), and a plurality of parallel sealing ring grooves (1 e) are arranged at the left end part of the core rod (1),

the buckling and pressing outer sleeve component (2) comprises 2 upper buckling and pressing outer sleeves (2 a) and lower buckling and pressing outer sleeves (2 b) which are in half tile shapes,

the upper buckling outer sleeve (2 a): an upper positioning half ring (2 a 1) is arranged on the right side, an upper limiting half ring clamping edge (2 a 2) is arranged inside the right side, an upper pipe sleeve semi-ring groove (2 a 3) is arranged at the left end inside the right side, an upper semi-ring groove (2 a 4) is arranged on the lower horizontal plane of the rear part, a U-shaped upper lifting handle accommodating groove (2 a 5) is arranged at the front upper part of the outer circle, a rotatable U-shaped lifting handle (2 a 6) is arranged in the upper lifting handle, a square upper sinking platform (2 a 7) is arranged at the front part of the outer circle, a horizontal hook pin mounting blind hole (2 a 8) is arranged in the middle part of the left vertical surface of the upper lifting handle, a hook pin clamping limiting hole (2 a8 a) is arranged in the upper buckling outer sleeve (2 a) in the circumferential direction between the upper positioning half ring (2 a 1) and the upper,

the lower buckling outer sleeve (2 b): the right side is provided with a lower positioning semi-ring (2 b 1), the inside of the right side is provided with a lower limiting semi-ring clamping edge (2 b 2), the left end of the inside is provided with a lower casing semi-ring groove (2 b 3), the rear part of the right side is provided with a lower semi-ring groove (2 b 4) along the horizontal plane, the front lower part of the right side is provided with a U-shaped lower handle accommodating groove (2 b 5), a rotatable U-shaped handle (2 a 6) is installed in the front part of the right side, the front lower left part plane of the right side is provided with a square sinking platform (2 b 7), the front lower left part plane of the right side is provided with a short pin shaft (2 b 8), a T-shaped hook pin (2 b 9) capable of rotating around the hook pin is installed on the front lower part of the right side, the T-shaped right end part of the hook pin (2 b 9) is provided with a downward draw hook (2 b9 b), the inside is provided with a needling (2 a 12) in the circumferential direction between the lower positioning semi-ring (2 b 1) and the lower limiting semi-ring clamping edge (2,

the pipe sleeve (3) is a sleeve ring with a gap (3 a) formed in the side face, a positioning edge (3 b) is arranged on the periphery of the right end of the pipe sleeve (3) in the circumferential direction, and a plurality of circles of parallel annular ratchets (3 c) with tooth tips facing the right side are arranged on the inner circumference of the pipe sleeve (3).

2. An F-flange joint according to claim 1, wherein: the bottom width of the annular positioning groove (1 d) is 5mm, the thicknesses of the upper positioning half ring (2 a 1) and the lower positioning half ring (2 b 1) are 5mm, and the bottom of the annular positioning groove (1 d) is in clearance fit with the upper positioning half ring (2 a 1) and the lower positioning half ring (2 b 1).

3. An F-flange joint according to claim 1, wherein: go up to withhold overcoat (2 a) and withhold overcoat (2 b) rear portion down on semicircular groove (2 a 4) and lower semicircular groove (2 b 4) the rear portion have all seted up inclined plane (2 a 9) and lower inclined plane (2 b 10), go up to withhold overcoat (2 a) and withhold overcoat (2 b) down and can rotate certain angle and do not interfere around major axis (2 c).

4. An F-flange joint according to claim 1, wherein: the spring piece (2 d) is made of 65 manganese, is fixed on the peripheries of the upper buckling outer sleeve (2 a) and the lower buckling outer sleeve (2 b) by adopting a rivet (2 e) riveting structure, and is in a clamping trend in a working state; the inner diameter of the pipe sleeve (3) in a free state is larger than the outer diameter of the rubber pipe (4).

5. An F-flange joint according to claim 1, wherein: the upper handle accommodating groove (2 a 5) and the lower handle accommodating groove (2 b 5) are respectively provided with a rotating spring (2 a 10) and a pin shaft (2 a 11), the handle (2 a 6) rotates around the pin shaft (2 a 11), and the normal state is horizontally placed in the upper handle accommodating groove (2 a 5) and the lower handle accommodating groove (2 b 5).

6. An F-flange joint according to claim 1, wherein: hook (2 b 9) T shape left end portion is equipped with finger gib head (2 b9 a) down, long through-hole (2 b9 c) about hook (2 b 9) T shape lower extreme is seted up, install pressure spring (2 b9 d) from the end up to between short hinge pin axle (2 b 8) in the long through-hole (2 b9 c).

7. An F-flange joint according to claim 1, wherein: the inclined angle of the annular ratchet (3 c) of the pipe sleeve (3) is 30 degrees.

8. An F-flange joint according to claim 1, wherein: the left vertical surface of the annular positioning groove (1 d) is an inclined annular surface (1 d 1), and an included angle between the inclined annular surface (1 d 1) and the central axis of the buckling outer sleeve component (2) is 75 degrees; the left vertical surface of the upper pipe sleeve half ring groove (2 a 3) and the lower pipe sleeve half ring groove (2 b 3) is an inclined upper circular ring surface (2 a3 a) and a lower circular ring surface (2 b3 a), and the inclined angle and the included angle of the central axis of the buckling outer sleeve component (2) are 75 degrees.

9. An F-flange joint according to claim 1, wherein: the height of the needling (2 a 12) is 10mm, the needling is evenly distributed in the circumferential direction and the total number is 4.

10. Use of a F-flange joint according to any one of claims 1 to 9, comprising the following steps:

(1) the pipe sleeve (3) is sleeved at a proper position of the rubber pipe (4),

(2) the rubber tube (4) sleeved with the tube sleeve (3) is sleeved from the left end of the core rod (1) until the left end leans against the left side outer vertical surface of the annular positioning groove (1 d),

(3) the hook pin (2 b 9) is opened, the handle (2 a 6) on the upper buckling outer sleeve (2 a) and the handle (2 a 6) of the lower buckling outer sleeve (2 b) are pulled, the buckling outer sleeve assembly (2) is unfolded to a proper angle,

(4) aligning an upper positioning half ring (2 a 1) and a lower positioning half ring (2 b 1) of the crimping outer sleeve component (2) with an annular positioning groove (1 d), and simultaneously aligning an upper pipe sleeve half ring groove (2 a 3), a lower pipe sleeve half ring groove (2 b 3) and a positioning edge (3 b),

(5) after the buckling of the buckling outer sleeve component (2), the hook pin (2 b 9) is pulled leftwards and upwards and simultaneously rotates, the T-shaped right end of the hook pin (2 b 9) penetrates into the hook pin mounting blind hole (2 a 8),

(6) the draw hook (2 b9 b) of the hook pin (2 b 9) is clamped in the hook pin clamping limiting hole (2 a8 a) to realize locking,

(7) and (5) when the joint needs to be opened, reversely operating the steps (3) to (6).

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