CN209839414U - Quick-opening type multipurpose flange quick locking device - Google Patents

Abstract

The utility model discloses a quick-opening multipurpose flange quick locking device, belonging to the technical field of flange dismounting devices, comprising a first hoop body and a second hoop body which are symmetrically arranged, wherein the adjacent two ends of the first hoop body and the second hoop body which are positioned at the same side are connected through a buckle component, and the adjacent two ends of the other side are connected through a telescopic component; the telescopic assembly comprises a telescopic shaft and a positioning cylinder, one end of the positioning cylinder is fixedly connected with the second hoop body, the other end of the positioning cylinder is connected with the first hoop body through the telescopic shaft penetrating into the positioning cylinder, and one end of the telescopic shaft in the positioning cylinder is connected with the inner side thread of the positioning cylinder. The utility model discloses can lock the flange firm in the in-process of dismantling the flange for the better dismantlement of flange bolt has avoided the condition that the flange bolt takes place the dislocation, and convenient operation can lock practical convenient to multiple not unidimensional flange moreover.

Description

Quick-opening type multipurpose flange quick locking device

Technical Field

The utility model relates to a flange dismounting device's technical field, specific quick-open type multipurpose flange quick locking device that says so.

Background

Pipe connections in gas or liquid conveying pipelines are usually flanged, and control parts of valves are also flanged in pipelines; but at the in-process that operating personnel dismantled relief valve or valve flange bolt, the flange bolt produces the dislocation easily for increased the dismantlement degree of difficulty to the flange bolt, the condition such as crow bar skids takes place easily moreover, causes bolt screw to damage and bodily injury, has reduced work efficiency. Therefore, in order to increase work efficiency and reduce the operation risk of workers in the operation process of disassembling and assembling flange bolts, the device capable of quickly locking the flange is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above technical problem, provide a quick-open multi-purpose flange quick locking device, can dismantle the in-process to the flange and lock the flange firm for the better dismantlement of flange bolt has avoided the condition that flange bolt takes place the dislocation, and convenient operation can lock multiple not unidimensional flange moreover, and is practical convenient.

The utility model discloses a following technical scheme realizes:

a quick-opening type multipurpose flange quick locking device comprises a first hoop body and a second hoop body which are symmetrically arranged, wherein the adjacent two ends of the first hoop body and the adjacent two ends of the second hoop body which are positioned on the same side are connected through a buckle assembly, and the adjacent two ends of the other side are connected through a telescopic assembly; the telescopic assembly comprises a telescopic shaft and a positioning cylinder, one end of the positioning cylinder is fixedly connected with the second hoop body, the other end of the positioning cylinder is connected with the first hoop body through the telescopic shaft penetrating into the positioning cylinder, and one end of the telescopic shaft in the positioning cylinder is connected with the inner side thread of the positioning cylinder.

In order to better realize the utility model discloses, furtherly, be provided with the removal stopper with the coaxial fixed connection of telescopic shaft in the location section of thick bamboo, be provided with the external screw thread on the week side of removing the stopper, the inboard one end that is close to the second hoop body of a location section of thick bamboo is provided with external screw thread assorted internal thread.

In order to better realize the utility model discloses, furtherly, the inside thread groove that is provided with of a location section of thick bamboo, remove stopper and thread groove threaded connection, the movement stroke of removing the stopper in a location section of thick bamboo is greater than the length of thread groove, the diameter of removing the stopper is less than the internal diameter of a location section of thick bamboo and is greater than the diameter of telescopic shaft.

In order to better realize the utility model discloses, furtherly, still include spacing lid of using, the lid has been cup jointed to the outside screw thread on location section of thick bamboo top, the telescopic shaft is worn to establish to the barrel in through the lid.

In order to better realize the utility model, the utility model further comprises a limiting component, wherein the limiting component comprises a connecting lug, a limiting connecting block, a limiting rod and a limiting shaft, the telescopic shaft between the first hoop body and the positioning cylinder is rotatably sleeved with the limiting connecting block through an annular chute, the two sides of the limiting connecting block are symmetrically and fixedly provided with the connecting lug, the connecting lug is provided with a transverse waist-shaped connecting hole, the limiting rod is connected in the waist-shaped connecting hole through a movable shaft, and the limiting rod is provided with a plurality of limiting holes along the length direction; the locating cylinder is fixed with a limiting shaft matched with the limiting hole along the length direction on one side close to the limiting rod, and the limiting rod is penetrated through the limiting hole at one end of the limiting shaft far away from the locating cylinder and connected with a locking part.

In order to better realize the utility model discloses, furtherly, buckle assembly includes locking hasp expansion end and locking hasp stiff end, the setting of locking hasp expansion end is at the tip of the second hoop body, the setting of locking hasp stiff end is at the tip of the first hoop body, be provided with the buckle on the locking hasp expansion end, and be connected with the locking hasp stiff end through the buckle.

In order to better realize the utility model discloses, furtherly, the buckle includes first latch closure and parting bead, the latch closure is close to and separates a plurality ofly and the buckle connector of locking hasp fixed end looks adaptation through the parting bead in the one end of latch hook.

In order to better realize the utility model discloses, furtherly, the buckle includes second latch closure and third latch closure, the second latch closure is close to the one end outside of locking hasp stiff end and articulates there is the third latch closure.

In order to better realize the utility model discloses, furtherly, all be provided with the parting bead in third latch closure and the second latch closure, and separate a plurality ofly through the parting bead respectively and lock the buckle connector of hasp fixed end looks adaptation.

In order to better realize the utility model, furthermore, the inner side surfaces of the first hoop body and the second hoop body are respectively provided with a liquid discharge groove which is convenient for liquid at the flange joint to flow out; and an observation slotted hole for observing the alignment condition of the flange is formed in the middle of the outer side of the first hoop body.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

(1) the utility model discloses a flexible subassembly and buckle subassembly make first hoop body and second hoop body connect to carry out the closure locking to the flange, and can adjust the interval of first hoop body and second hoop body through the flexible of flexible subassembly, and cooperate the buckle subassembly to carry out the closure locking to the flange of not unidimensional, can carry out spacing through spacing subassembly to the flexible of flexible subassembly simultaneously, better satisfy the locking to the flange; therefore, when the flange bolt is disassembled, the flange can not be dislocated, the flange bolt can be well disassembled, and the flange bolt disassembling tool is reasonable and practical in structure and convenient to operate.

Drawings

FIG. 1 is a schematic front view of the structure of example 1;

FIG. 2 is a schematic view of the buckle structure of the present invention;

fig. 3 is a schematic top view of the first hoop body of the present invention;

FIG. 4 is a schematic view of another embodiment of the buckle of the present invention;

fig. 5 is a schematic structural view of the telescopic assembly and the limiting assembly of the present invention;

fig. 6 is another schematic structural diagram of the present invention;

fig. 7 is a bottom view of the second band of the present invention;

FIG. 8 is a schematic view of the connection structure of the telescopic shaft and the movable limiting block of the present invention;

fig. 9 is a schematic structural view of the positioning cylinder of the present invention;

fig. 10 is a top view of the movable end of the locking buckle of the present invention without the division bar.

Wherein: 1-a first hoop body; 2-a second hoop body; 3-a telescopic assembly; 31-a limit end; 32-a telescopic shaft; 33-a positioning cylinder; 34-a connecting shaft; 35-a lock nut; 36-moving a stopper; 4-a limiting component; 41-limiting connecting blocks; 42-kidney-shaped connecting hole; 43-connecting lugs; 44-a limiting shaft; 45-a limiting rod; 46-a limiting hole; 5-a snap-fit assembly; 51-locking hasp fixing end; 52-a retaining ring; 53-locking the movable end of the hasp; 54-snap connection holes; 55-a second retaining ring; 56-third retaining ring; 57-a first clasp; 6-Observation of the slot.

Detailed Description

Referring to fig. 1-10, a quick-opening type multipurpose flange quick locking device includes a first hoop body 1 and a second hoop body 2 which are symmetrically arranged, two adjacent ends of the first hoop body 1 and the second hoop body 2 which are located on the same side are connected through a buckle assembly 5, and two adjacent ends of the other side are connected through a telescopic assembly 3; the telescopic assembly 3 comprises a telescopic shaft 32 and a positioning barrel 33, one end of the positioning barrel 33 is fixedly connected with the second hoop body 2, the other end of the positioning barrel 33 is connected with the first hoop body 1 through the telescopic shaft 32 penetrating into the positioning barrel 33, and one end of the telescopic shaft 32 in the positioning barrel 33 is connected with the inner side thread of the positioning barrel 33.

The middle parts of the inner sides of the first hoop body 1 and the second hoop body 2 are respectively provided with an arc part which is attached to the peripheral side of the flange, and a plurality of embedded teeth are arranged in the arc parts and are used for blocking the flanges at the two sides tightly; the first hoop body 1 and the second hoop body 2 are positioned between the same side end parts and are connected through the telescopic assembly 3, and the telescopic shaft 32 of the telescopic assembly 3 is in threaded connection with the inner side of the positioning cylinder 33, so that the telescopic shaft 32 can be extended or shortened when rotating, and the adjustment of the distance between the first hoop body 1 and the second hoop body 2 is realized, and flanges of different sizes are clasped and locked; preferably, the second hoop body 2 is detachably and fixedly connected with the positioning cylinder 33; the end parts of the first hoop body 1 and the second hoop body 2, which are positioned on the other same side, are connected through a buckle assembly 5, the buckle assembly 5 preferably has at least two buckle connectors 54, and the buckle connectors 54 are used for matching the length of the telescopic assembly 3 so as to lock and embrace flanges of different sizes or models; after locking the cohesion to the flange like this, can be very convenient dismantle the flange bolt, the effectual dislocation of having avoided adjacent flange makes the screw thread dislocation, causes the problem of dismantling the difficulty.

A connecting shaft 34 fixed at the end of the positioning cylinder 33 is arranged between the positioning cylinder 33 and the second hoop body 2, one end of the connecting shaft 34 far away from the positioning cylinder 33 penetrates through the second hoop body 2, and is in threaded connection with a locking nut 35; one end of the telescopic shaft 32 outside the positioning cylinder 33 penetrates through the first hoop body 1 and is fixedly connected with a limiting end head 31; a connecting shaft 34 at one end of the positioning cylinder 33 far away from the telescopic shaft 32 and a locking nut 35 on the connecting shaft 34 are used for connecting and fastening with the second hoop body 2; the fixed connection mode of spacing end 31 and telescopic shaft 32 is fixed connection so be convenient for rotate the telescopic shaft.

Further, as shown in fig. 1, fig. 5, fig. 6, fig. 8 and fig. 9, as a preferred option of different embodiments, a movable limiting block 36 coaxially and fixedly connected with the telescopic shaft 32 is arranged in the positioning cylinder 33, an external thread is arranged on the peripheral side of the movable limiting block 36, and an internal thread matched with the external thread is arranged at one end of the inner side of the positioning cylinder 33, which is close to the second hoop body 2.

The movable limiting block 36 is connected to one end, close to the connecting shaft 34, of the inner side of the positioning cylinder 33 in a threaded connection mode, so that when the movable limiting block 36 is connected in the positioning cylinder 33 in a threaded connection mode, flanges of one size or model can be locked in a holding mode, and when the movable limiting block 36 is screwed out of the inner threads by rotating the limiting end 31, flanges of another size or model can be locked in a holding mode.

Further, as shown in fig. 9, as a preferable option of different embodiments, a thread groove is provided inside the positioning cylinder 33, the movable limiting block 36 is in threaded connection with the thread groove, a movement stroke of the movable limiting block 36 in the positioning cylinder 33 is greater than a length of the thread groove, and a diameter of the movable limiting block 36 is smaller than an inner diameter of the positioning cylinder 33 and is greater than a diameter of the telescopic shaft 32.

The internal thread sets up at the thread groove, it passes through the internal thread to remove stopper 36, the external screw thread is connected with the thread groove, be convenient for like this remove stopper 36 can be driven under the rotation of telescopic shaft 32 and rotate, can screw out and the screw in, when removing stopper 36 screw in the thread groove bottom, can carry out the locking of cohesion to the flange of a size or model, after the one end that removes stopper 36 screw out the thread groove, can freely remove in a location section of thick bamboo 33, can carry out cohesion locking to the flange of great dimension or model when removing stopper 36 and remove the top.

Further, as shown in fig. 1, 5, 6 and 9, the device further includes a cover body for limiting, the outer thread of the top end of the positioning cylinder 33 is sleeved with the cover body, and the telescopic shaft 32 is inserted into the cylinder body through the cover body.

Through setting up barrel and lid, the dismantlement and the change to the part of a location section of thick bamboo 33 of being convenient for like this, it is more convenient.

Further, as shown in fig. 1 and 5, as a preferred option of different embodiments, the present invention further includes a limiting assembly 4, where the limiting assembly 4 includes a connecting lug 43, a limiting connecting block 41, a limiting rod 45 and a limiting shaft 44, the telescopic shaft 32 between the first hoop body 1 and the positioning cylinder 33 is rotatably sleeved with the limiting connecting block 41 through an annular sliding groove, the connecting lugs 43 are fixedly disposed at two sides of the limiting connecting block 41 symmetrically, a transverse waist-shaped connecting hole 42 is disposed on the connecting lug 43, the limiting rod 45 is connected in the waist-shaped connecting hole 42 through a movable shaft, and a plurality of limiting holes 46 are disposed on the limiting rod 45 along the length direction; the locating cylinder 33 is fixed with the spacing axle 44 with spacing hole 46 looks adaptation on being close to a spacing rod 45 one side along length direction, spacing axle 44 is kept away from the one end of locating cylinder 33 and is worn to establish the gag lever post 45 through spacing hole 46, and is connected with locking part.

The limiting assembly 4 is used for limiting the relative position between the positioning cylinder 33 and the limiting connecting block 41 to control the distance between the first hoop body 1 and the second hoop body 2, and can be selectively matched with the telescopic assembly for use, so that more flanges with different sizes can be clasped and locked; the limiting connecting block 41 is rotatably sleeved on the outer side of the telescopic shaft 32 between the first hoop body 1 and the positioning cylinder 33; the connecting lug 43 is integrally molded or welded with the positioning cylinder 33, a movable shaft arranged in the waist-shaped connecting hole 42 of the connecting lug 43 can rotate and move in the waist-shaped connecting hole 42, and the limiting rod 45 is connected with the connecting lug 43 through the movable shaft, so that the limiting rod 45 can move transversely while being provided with a hinged lock, the limiting rod 45 is conveniently connected with the limiting shaft 44, and the limiting rod 45 can be better connected with the limiting shaft 44 through the transverse waist-shaped connecting hole 42; the limiting rod 45 is provided with a plurality of limiting holes 46 arranged along the length, so that the limiting can be realized after the limiting shaft 44 is connected with the limiting holes 46 when the telescopic shaft 32 extends or shortens, the telescopic shaft 32 is prevented from moving, and the locking part is used for locking after the limiting rod 45 is connected with the limiting shaft 44 and is preferably a nut; the limiting shaft 44 is fixed on the positioning cylinder 33, preferably, the limiting shaft 44, the limiting rod 45 and the connecting lug 43 are all made of metal with better strength; the number of the limiting holes 46 is consistent with the number of the buckle connecting ports 54 of the buckle assembly 5, so that the flanges can be well clasped and locked, and of course, each limiting hole 46 can be matched with the buckle connecting ports 54 to correspond to the flanges of one size or model, so that the clasping and locking of the flanges of different sizes can be more convenient.

Further, as shown in fig. 1 and fig. 6, the buckle assembly 5 includes a locking buckle movable end 53 and a locking buckle fixed end 51, the locking buckle movable end 53 is disposed at an end of the second hoop body 2, the locking buckle fixed end 51 is disposed at an end of the first hoop body 1, and the locking buckle movable end 53 is provided with a retaining ring 52 and is connected to the locking buckle fixed end 51 through the retaining ring 52.

The movable end 53 of the locking buckle is provided with a movable buckle ring 52, the movable end 53 of the locking buckle is hinged to the end of the second hoop body 2, a locking hook matched with a buckle connector 54 on the buckle ring 52 is arranged on the end on the same side of the first hoop body 1, the fixed end 51 of the locking buckle is the locking hook, a plurality of buckle connectors 54 are arranged on the buckle ring 52, and the structure of the buckle ring 52 can adopt the structure shown in fig. 2 or fig. 4; when the locking buckle is used, the movable end 53 of the locking buckle is rotated, the needed buckle connecting port 54 on the retaining ring 52 is connected with the locking hook, and then the pressing handle of the movable end 53 of the locking buckle is pressed downwards to realize buckle locking.

Further, as shown in fig. 2, the clasp 52 includes a first clasp 57 and a separating strip, and the clasp near one end of the latch hook is separated by the separating strip into a plurality of snap connection ports 54 matching with the fixed end 51 of the locking buckle.

When the telescopic component is used, the buckle connecting port 54 corresponding to the telescopic length of the telescopic component 3 on the retaining ring 52 is connected with the locking hook and then locked.

Further, as shown in fig. 4 and 6, the buckle ring 52 preferably includes a second buckle 55 and a third buckle 56, and the second buckle 55 is hinged to the third buckle 56 near the outside of the end of the fixed end 51 of the locking buckle.

The third buckle 56 is hinged at the end of the second buckle 55 through a pin shaft, so that the third buckle 52 can rotate around the pin shaft, and when flanges with different sizes are locked in a clasping manner, the second buckle 55 corresponding to the telescopic length of the telescopic component 3 or the buckle connecting port 54 on the third buckle 56 is selected to be connected with the lock hook.

Further, as shown in fig. 6 and 4, preferably, a separating strip is disposed in each of the third buckle 56 and the second buckle 55, and a plurality of snap connection ports 54 adapted to the fixed end 51 of the locking buckle are respectively separated by the separating strip.

By providing a separation strip in each of the third and second clasps 56 and 55, a plurality of snap connection ports can be separated to increase the range of applicable models.

Further, as shown in fig. 3, as a preference of a different embodiment, the inner side surfaces of the first hoop body 1 and the second hoop body 2 are provided with liquid drainage grooves for facilitating liquid outflow at the flange connection; and an observation slot hole 6 for observing the alignment condition of the flange is formed in the middle of the outer side of the first hoop body 1.

When the flange is disassembled, the fastening of the flange is reduced, so that the liquid in the pipeline flows out, and the liquid can be conveniently discharged by the liquid stopping groove when the flange passes through the liquid stopping groove; through setting up observation slotted hole 6, can be convenient for observe the alignment condition of first clamp middle part and flange joint department, it is more practical convenient.

The utility model discloses an application principle:

when a flange with a better size is disassembled, the movable limiting block 36 connected with the telescopic shaft 32 is screwed into the internal thread and screwed, the pressing handle of the movable end 53 of the locking hasp is lifted, the buckle connecting port 54 with the corresponding length on the retaining ring 52 is connected with the locking hook, then the pressing handle is pressed downwards, the flanges on two sides are locked between the first hoop body 1 and the second hoop body 2, and at the moment, the flange bolt can be disassembled; when a flange with a larger size is disassembled, the movable limiting block 36 connected with the telescopic shaft 32 is screwed out of the internal thread and moves to the upper end of the positioning cylinder 33, the pressing handle of the movable end 53 of the locking hasp is lifted, the buckle connecting port 54 with the corresponding length on the snap ring 52 is connected with the locking hook, then the pressing handle is pressed downwards, the flanges on two sides are locked between the first hoop body 1 and the second hoop body 2, and at the moment, the flange bolt can be disassembled.

Certainly, after the clasping, the auxiliary limiting can be performed through the limiting component 4, so as to control the telescopic length of the telescopic shaft 32, when the telescopic shaft 32 rotates to the required telescopic length, the corresponding limiting hole 46 on the limiting rod 45 is connected with the limiting shaft 44 and locked by the locking component, then the first hoop body 1 is attached to the upper part of the peripheral side of the flange, then the second hoop body 2 is attached to the lower part of the peripheral side of the flange, the connecting shaft 34 is connected with the second hoop body 2, and the locking is performed by the locking nut 35; then, the buckle connecting port 54 corresponding to the telescopic length of the telescopic component 3 on the retaining ring 52 is selected to be connected with the locking hook, and the movable end 53 of the locking buckle is pressed downwards to be locked, so that the flange bolt can be detached.

The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.

Claims (10)

1. The utility model provides a quick locking device of multi-purpose flange of quick open, includes first hoop body (1), the second hoop body (2) that the symmetry set up, its characterized in that: the adjacent two ends of the first hoop body (1) and the second hoop body (2) which are positioned on the same side are connected through a buckle component (5), and the adjacent two ends of the other side are connected through a telescopic component (3); the telescopic component (3) comprises a telescopic shaft (32) and a positioning barrel (33), one end of the positioning barrel (33) is fixedly connected with the second hoop body (2), the other end of the positioning barrel is connected with the first hoop body (1) through the telescopic shaft (32) penetrating into the positioning barrel (33), and one end of the telescopic shaft (32) in the positioning barrel (33) is connected with the inner side thread of the positioning barrel (33).

2. The quick-opening multipurpose flange quick-locking device according to claim 1, characterized in that: be provided with in the location section of thick bamboo (33) with coaxial fixed connection's of telescopic shaft (32) removal stopper (36), be provided with the external screw thread on the week side of removing stopper (36), the one end that location section of thick bamboo (33) inboard is close to second hoop body (2) is provided with the internal thread with external screw thread assorted.

3. The quick-opening multipurpose flange quick-locking device according to claim 2, characterized in that: the inside thread groove that is provided with of a location section of thick bamboo (33), remove stopper (36) and thread groove threaded connection, the movement stroke of removing stopper (36) in a location section of thick bamboo (33) is greater than the length of thread groove, the diameter that removes stopper (36) is less than the internal diameter of a location section of thick bamboo (33) and is greater than the diameter of telescopic shaft (32).

4. The quick-opening multipurpose flange quick-locking device according to claim 1, characterized in that: the positioning barrel is characterized by further comprising a cover body for limiting, the cover body is sleeved on the outer side of the top end of the positioning barrel (33) in a threaded manner, and the telescopic shaft (32) penetrates through the cover body and is arranged in the barrel body.

5. A quick-opening multi-purpose flange quick-locking device according to any one of claims 1 to 4, characterized in that: the positioning device is characterized by further comprising a limiting assembly (4), wherein the limiting assembly (4) comprises a connecting lug (43), a limiting connecting block (41), a limiting rod (45) and a limiting shaft (44), the limiting connecting block (41) is sleeved on the telescopic shaft (32) between the first hoop body (1) and the positioning cylinder (33) in a rotating mode through an annular sliding groove, the connecting lug (43) is fixedly arranged on two sides of the limiting connecting block (41) symmetrically, a transverse waist-shaped connecting hole (42) is formed in the connecting lug (43), the limiting rod (45) is connected in the waist-shaped connecting hole (42) through a movable shaft, and a plurality of limiting holes (46) are formed in the limiting rod (45) in the length direction; the locating cylinder (33) is close to limiting rod (45) one side and is fixed with spacing axle (44) with spacing hole (46) looks adaptation along length direction, spacing axle (44) are kept away from the one end of locating cylinder (33) and are worn to establish limiting rod (45) through spacing hole (46), and are connected with locking part.

6. The quick-opening multipurpose flange quick-locking device according to claim 1, characterized in that: buckle subassembly (5) are including locking hasp expansion end (53) and locking hasp stiff end (51), locking hasp expansion end (53) set up the tip at second hoop body (2), locking hasp stiff end (51) set up the tip at first hoop body (1), be provided with buckle (52) on locking hasp expansion end (53), and be connected with locking hasp stiff end (51) through buckle (52).

7. The quick-opening multipurpose flange quick-locking device of claim 6, characterized in that: the buckle ring (52) comprises a first buckle (57) and a separating strip, and a plurality of buckle connecting ports (54) matched with the locking buckle fixed end (51) are separated from one end of the buckle close to the locking hook through the separating strip.

8. The quick-opening multipurpose flange quick-locking device of claim 6, characterized in that: the retaining ring (52) comprises a second buckle (55) and a third buckle (56), and the outer side of one end, close to the locking hasp fixing end (51), of the second buckle (55) is hinged with the third buckle (56).

9. The quick-opening multipurpose flange quick-locking device of claim 8, characterized in that: and separating strips are arranged in the third buckle (56) and the second buckle (55), and a plurality of buckle connecting ports (54) matched with the locking buckle fixed end (51) are respectively separated by the separating strips.

10. The quick-opening multipurpose flange quick-locking device according to claim 1, characterized in that: the inner side surfaces of the first hoop body (1) and the second hoop body (2) are respectively provided with a liquid discharge groove which is convenient for liquid at the flange connection part to flow out; and an observation slotted hole (6) for observing the alignment condition of the flange is formed in the middle of the outer side of the first hoop body (1).