CN114233980A

CN114233980A - Heat preservation type pipe that unfreezes with obturator foaming heat preservation

Info

Publication number: CN114233980A
Application number: CN202111664785.9A
Authority: CN
Inventors: 谷军安; 周亚俊; 朱东升; 赵根
Original assignee: Lu'an Zhongcai Pipeline Technology Co ltd
Current assignee: Lu'an Zhongcai Pipeline Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-03-25

Abstract

The invention relates to the technical field of heat-preservation unfreezing type pipes, in particular to a heat-preservation unfreezing type pipe with a closed-cell foaming heat-preservation layer. According to the invention, through the matching of the arranged shielding plates, the movable connecting rod, the mounting head, the rocker and the through rod, the foaming adhesive is filled between two adjacent shielding plates in a matching manner with the foaming adhesive gun, the shielding plates are extruded during filling of the foaming adhesive, the shielding plates are driven to slide backwards in the sliding grooves, and the movable connecting rod is driven to rock in the movable hole in the moving process, so that the connecting shaft and the rocker are driven to rock simultaneously.

Description

Heat preservation type pipe that unfreezes with obturator foaming heat preservation

Technical Field

The invention relates to the technical field of heat-preservation unfreezing type pipes, in particular to a heat-preservation unfreezing type pipe with a closed-pore foaming heat-preservation layer.

Background

Tubing is the material used to make pipe fittings. Different pipes are used for different pipe fittings, the quality of the pipe fittings is directly determined, the pipe fittings are necessary materials for building engineering, a water supply pipe, a drain pipe, a gas pipe, a heating pipe, an electric wire conduit, a rainwater pipe and the like are commonly used, and the heat preservation pipe is a protection technology for preserving heat of the pipeline and avoiding condensation or freezing of a pipeline conveying medium. For general oil (gas) transportation pipes, the most common method is to externally wrap a heat-insulating layer outside the pipeline, and the existing heat-insulating pipeline is insulated by filling and foaming.

But the existing heat-preservation unfreezing type pipe with the closed-cell foaming heat-preservation layer is not perfect in structure and has certain defects:

1. current insulation pipe is filling when foaming because the pipeline is inside darker, is difficult to fill evenly, leads to inside to remain the space to influence the heat preservation of pipeline, lead to the pipeline still to have the condition of fracture after catching cold, and then influence the use of pipeline.

2. Current insulating tube does not have buffering and crashproof structure, installs the pipeline in the external world and is more fragile after receiving the freeze, if the surface of pipeline receives the striking, also can lead to the pipeline to damage under the condition of frost crack.

Disclosure of Invention

The invention aims to provide a heat-preservation unfreezing type pipe with a closed-pore foaming heat-preservation layer.

In order to achieve the purpose, the invention adopts the following technical scheme:

a heat-preservation unfreezing type pipe with a closed-cell foaming heat-preservation layer comprises a pipe body, a heat-preservation foaming filling layer, partition plates, sliding grooves, shielding plates, movable holes, movable connecting rods, mounting heads, connecting shafts, rocking rods, penetrating rods, stop blocks, limiting blocks, heat-preservation filling cotton, anti-collision layers, fixing rings, anti-slip pads, fixing blocks, buffer springs, fastening plates, fastening bolts, anti-collision shells, movable grooves, hooks, hanging holes, extension plates, clamping blocks, clamping grooves, sliding blocks, knobs, connecting springs, adjusting blocks and protective pads, wherein the heat-preservation foaming filling layer is arranged outside the pipe body, the heat-preservation filling cotton is fixedly arranged outside the heat-preservation foaming filling layer, the anti-collision layers are fixedly arranged outside the heat-preservation filling layer, a plurality of partition plates are fixedly connected to the inner wall of the heat-preservation foaming filling layer, the shielding plates are arranged between every two adjacent partition plates, two movable holes are symmetrically formed in the middles of the plurality of shielding plates, the equal activity of the middle part of a plurality of movable orifices is run through and is had swing joint pole, the equal fixedly connected with installation head of the one end of a plurality of swing joint poles, the equal fixed mounting of the one end of a plurality of installation heads has the connecting axle, the equal fixedly connected with rocker of the inner wall of a plurality of connecting axles, the equal activity of the outer wall of a plurality of rockers is run through and is had a plurality of poles that run through, a plurality of equal fixedly connected with stoppers of one end of running through the pole.

Preferably, the inner wall of a plurality of shielding plates all with the outer wall sliding connection of adjacent division board, a plurality of spouts have been seted up to the bottom of heat preservation foaming filling layer inner wall, the equal sliding connection of inner wall of a plurality of spouts has the slider, the top of a plurality of sliders all with the bottom fixed connection of adjacent shielding plate.

Preferably, the other ends of the movable holes are fixedly connected with stop blocks, and the size of each stop block is larger than that of each movable hole.

Preferably, the back of the inner walls of the plurality of shielding plates is fixedly connected with a connecting spring, one end of the plurality of connecting springs is fixedly connected with an adjusting block, and one end of the plurality of adjusting blocks is fixedly connected with a protection pad.

Preferably, the both sides of buffer stop outer wall all overlap and are equipped with solid fixed ring, two solid fixed ring's outside all is equipped with crashproof shell, two solid fixed ring's the equal symmetric connection of outer wall has a plurality of fixed blocks, the equal fixedly connected with buffer spring of one end of a plurality of fixed blocks, a plurality of buffer spring's one end all with adjacent crashproof shell's inner wall fixed connection, the equal fixedly connected with slipmat of two solid fixed ring's inner wall, the inner wall of two slipmats all laminates mutually with the outer wall of buffer stop.

Preferably, the two ends of the two fixing rings are fixedly connected with fastening plates, one ends of the two adjacent fastening plates are connected through the set fastening bolt threads, and one ends of the two fastening bolts are fixedly connected with knobs.

Preferably, two movable grooves are symmetrically formed in the outer walls of the two anti-collision shells, hooks are connected to the inner walls of the two movable grooves in a sliding mode, and hanging holes are formed in the middle of the two hooks.

Preferably, the equal fixedly connected with extension plate in bottom of two hanging holes, two extension plate sizes all are greater than the size of activity groove, the equal fixedly connected with fixture block in both sides of two extension plate bottoms.

Preferably, two clamping grooves are symmetrically formed in the outer walls of the two fixing rings, and the outer walls of the clamping blocks are connected with the inner walls of the adjacent clamping grooves in a clamping mode.

The invention has at least the following beneficial effects:

1. the invention fills the foaming glue between two adjacent isolation plates by matching the shielding plates, the movable connecting rods, the mounting heads, the rocking rods and the penetrating rods, extrudes the shielding plates when the foaming glue is filled, drives the shielding plates to slide backwards in the sliding grooves, the movable connecting rod is driven to rock in the movable hole in the moving process, so that the connecting shaft and the rocker are driven to rock simultaneously, the rocker is matched with the penetrating rod to break up the foaming adhesive extruded in the heat-insulation foaming filling layer, so that the foaming adhesive can be uniformly foamed into the heat-insulation foaming filling layer, play the effect of evenly filling the expanded polystyrene to the foaming filling layer that keeps warm, improved to a certain extent and carried out heat retaining efficiency through the foaming filling layer that keeps warm, increased the life of pipeline body, avoided the pipeline body to cause the condition of frostbite damage under cold weather.

2. The invention has the advantages that the invention has the function of anti-collision to the outside of the pipeline body through the matching of the arranged fixing ring, the fixing block, the buffer spring and the anti-collision shell, when the pipeline body is impacted, the impact force is transmitted to the anti-collision shell, the impact force is buffered and resolved through the matching of the arranged fixing block and the buffer spring, so that the impact force is weakened when being transmitted to the anti-collision layer, thereby achieving the effect of anti-collision to the pipeline body, the external hook is hung in the hanging hole formed on the hook through the matching of the arranged hook, the hanging hole, the extension plate and the fixture block, the anti-collision shell is driven to rise through the hanging hole, the effect of convenient transportation to the pipeline body is achieved, when the hook is not needed, the extension plate and the fixture block are only needed to be pressed down, the fixture block is connected with the clamping groove in a clamping way, the effect of containing the heat preservation filling cotton can be achieved, and the practicability and the flexibility of the device are increased to a certain extent, the use efficiency of the device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic view of a partial structure of the pipe body according to the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic view of the structure of the shielding plate of the present invention;

FIG. 5 is a schematic view of a back side partial structure of the duct body according to the present invention;

FIG. 6 is a schematic view of a partial cross-sectional structure of the chute of the present invention;

FIG. 7 is a schematic structural view of a crash shell according to the present invention;

fig. 8 is a partial enlarged view of fig. 7 at B.

In the figure: 1. a pipe body; 2. a thermal insulation foaming filling layer; 3. a separator plate; 4. a chute; 5. a shielding plate; 6. a movable hole; 7. a movable connecting rod; 8. a mounting head; 9. a connecting shaft; 10. a rocker; 11. penetrating the rod; 12. a stopper; 13. a limiting block; 14. insulating filling cotton; 15. an anti-collision layer; 16. a fixing ring; 17. a non-slip mat; 18. a fixed block; 19. a buffer spring; 20. a fastening plate; 21. fastening a bolt; 22. an anti-collision shell; 23. a movable groove; 24. hooking; 25. hanging holes; 26. an extension plate; 27. a clamping block; 28. a card slot; 29. a slider; 30. a knob; 31. a connecting spring; 32. an adjusting block; 33. and (6) a protective pad.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-8, the present invention provides a technical solution of a thermal insulation thawing type pipe with a closed cell foamed insulation layer:

the first embodiment is as follows:

as shown in fig. 1-6, a heat-insulating thawing type pipe with a closed-cell foamed heat-insulating layer comprises a pipe body 1, a heat-insulating foamed filling layer 2, a partition plate 3, a chute 4, a baffle plate 5, a movable hole 6, a movable connecting rod 7, an installing head 8, a connecting shaft 9, a rocker 10, a through rod 11, a stop block 12, a limit block 13, heat-insulating filling cotton 14, an anti-collision layer 15, a fixing ring 16, an anti-slip pad 17, a fixing block 18, a buffer spring 19, a fastening plate 20, a fastening bolt 21, an anti-collision shell 22, a movable groove 23, a hook 24, a hanging hole 25, an extension plate 26, a clamping block 27, a clamping groove 28, a sliding block 29, a knob 30, a connecting spring 31, an adjusting block 32 and a protection pad 33, wherein the heat-insulating foamed filling layer 2 is arranged outside the heat-insulating foamed filling layer 2, the heat-insulating filling cotton 14 is fixed outside the heat-insulating filling cotton 14, the anti-collision layer 15 is arranged outside the heat-insulating filling cotton 14, the inner wall of the heat-preservation foaming filling layer 2 is fixedly connected with a plurality of isolation plates 3, shielding plates 5 are arranged between every two adjacent isolation plates 3, two movable holes 6 are symmetrically formed in the middle of each shielding plate 5, movable connecting rods 7 penetrate through the middle of each movable hole 6 in a movable mode, one ends of the movable connecting rods 7 are fixedly connected with mounting heads 8, one ends of the mounting heads 8 are fixedly provided with connecting shafts 9, the inner walls of the connecting shafts 9 are fixedly connected with rocking rods 10, the outer walls of the rocking rods 10 are movably penetrated with a plurality of penetrating rods 11, one ends of the penetrating rods 11 are fixedly connected with limiting blocks 13, through the matching of the shielding plates 5, the movable connecting rods 7, the mounting heads 8, the rocking rods 10 and the penetrating rods 11, the foaming adhesive is filled between every two adjacent isolation plates 3 in a matched foaming adhesive gun, and the foaming adhesive extrudes the shielding plates 5 during filling, the shielding plates 5 are driven to slide backwards in the sliding grooves 4, the movable connecting rods 7 are driven to swing in the movable holes 6 in the moving process, so that the connecting shafts 9 and the rocking rods 10 are driven to swing simultaneously, the rocking rods 10 are matched with the penetrating rods 11 to break up the foaming adhesive extruded in the heat-insulation foaming filling layer 2, so that the foaming adhesive can be uniformly stained in the heat-insulation foaming filling layer 2, the heat-insulation foaming filling layer 2 is uniformly filled with the foaming adhesive, the heat-insulation efficiency of the heat-insulation foaming filling layer 2 is improved to a certain extent, the service life of the pipeline body 1 is prolonged, the condition that the pipeline body 1 is damaged by frostbite in cold weather is avoided, the inner walls of the shielding plates 5 are all in sliding connection with the outer walls of the adjacent partition plates 3, the bottom ends of the inner walls of the heat-insulation foaming filling layer 2 are provided with the sliding grooves 4, and the inner walls of the sliding grooves 4 are all in sliding connection with the sliding blocks 29, the top of a plurality of sliders 29 all with the bottom fixed connection of adjacent shielding plate 5, the equal fixedly connected with dog 12 of the other one end of a plurality of activity holes 6, the size of a plurality of dogs 12 all is greater than the size of activity hole 6, the setting of dog 12 plays spacing and blocking effect to swing joint pole 7, the equal fixedly connected with coupling spring 31 in the back of a plurality of shielding plate 5 inner walls, the equal fixedly connected with regulating block 32 of one end of a plurality of coupling spring 31, the equal fixedly connected with protection pad 33 of one end of a plurality of regulating block 32.

Example two:

on the basis of the first embodiment, as shown in fig. 1, 7 and 8, fixing rings 16 are respectively sleeved on two sides of the outer wall of the anti-collision layer 15, anti-collision shells 22 are respectively arranged outside the two fixing rings 16, the outer walls of the two fixing rings 16 are respectively and symmetrically connected with a plurality of fixing blocks 18, one ends of the fixing blocks 18 are respectively and fixedly connected with a buffer spring 19, one ends of the buffer springs 19 are respectively and fixedly connected with the inner wall of the adjacent anti-collision shell 22, the inner walls of the two fixing rings 16 are respectively and fixedly connected with anti-slip mats 17, the inner walls of the two anti-slip mats 17 are respectively attached to the outer wall of the anti-collision layer 15, two ends of the two fixing rings 16 are respectively and fixedly connected with fastening plates 20, one ends of the adjacent two fastening plates 20 are respectively and threadedly connected through the arranged fastening bolts 21, one ends of the two fastening bolts 21 are respectively and fixedly connected with a knob 30, the fastening plates 20, the fastening bolts 21 are matched with the knob 30 to play a role in loosening and fastening regulation on the fixing rings 16, the pipeline anti-collision device is detachable subsequently and suitable for being installed on pipelines with different sizes, the outer walls of two anti-collision shells 22 are symmetrically provided with two movable grooves 23, the inner walls of the two movable grooves 23 are connected with hooks 24 in a sliding manner, the middle parts of the two hooks 24 are provided with hanging holes 25, the bottom ends of the two hanging holes 25 are fixedly connected with extension plates 26, the sizes of the two extension plates 26 are larger than the sizes of the movable grooves 23, the two sides of the bottom ends of the two extension plates 26 are fixedly connected with clamping blocks 27, the outer walls of the two fixing rings 16 are symmetrically provided with two clamping grooves 28, and the outer walls of a plurality of clamping blocks 27 are clamped and connected with the inner walls of the adjacent clamping grooves 28. the pipeline anti-collision device has an anti-collision function on the outer part of a pipeline body 1 through the matching of the fixing rings 16, the fixing blocks 18 and the buffer springs 19 and the anti-collision shells 22, and when the pipeline body 1 is impacted, the impact force is transmitted to the anti-collision shells 22, buffering and clearing the impact force through the matching of the set fixed block 18 and the buffer spring 19, weakening the impact force when transmitting to the anti-collision layer 15, achieving the effect of preventing collision on the pipeline body 1, through the set hook 24, the hanging hole 25, the matching of the extension plate 26 and the fixture block 27, hanging the external hook into the hanging hole 25 set on the hook 24, driving the anti-collision shell 22 to ascend through the hanging hole 25, achieving the effect of facilitating transportation of the pipeline body 1, when the hook 24 is not needed, only needing to press the extension plate 26 and the fixture block 27, connecting the fixture block 27 with the clamping groove 28, achieving the effect of storing the heat-preservation filling cotton 14, increasing the practicability and flexibility of the device to a certain extent, and improving the use efficiency of the device.

The working principle is as follows: when the heat-insulating foaming filling layer is used, the foaming adhesive is filled in the heat-insulating foaming filling layer 2 firstly, the foaming adhesive is extruded between two adjacent partition plates 3 through a foaming adhesive gun, the foaming adhesive extrudes the shielding plate 5 during filling, the shielding plate 5 is driven to slide backwards in the sliding groove 4, the movable connecting rod 7 is driven to rock in the movable hole 6 in the moving process, the connecting shaft 9 and the rocker 10 are driven to rock simultaneously, the rocker 10 is matched with the penetrating rod 11 to scatter the foaming adhesive extruded in the heat-insulating foaming filling layer 2, the foaming adhesive can be uniformly stained in the heat-insulating foaming filling layer 2 to achieve the uniform filling effect, when the shielding plate 5 moves to the attached protective pad 33, the protective pad 33 and the adjusting block 32 are driven to buffer under the matching of the connecting spring 31, the condition that foaming agent overflows due to overlarge extrusion force is avoided, a certain heat-insulating effect is achieved on the pipeline body 1 through the foaming adhesive uniformly filled in the heat-insulating foaming filling layer 2, the arranged heat-preservation filling cotton 14 increases the heat-preservation effect, when the pipeline body 1 needs to be prevented from being collided, the fastening bolt 21 is rotated to drive the two fastening plates 20 to be close to or away from each other until the two fastening plates 20 are closely attached to the anti-collision layer 15, the two fastening plates 20 are limited and fixed by the screw fastening bolt 21, when the pipeline body 1 is impacted, the impact force is transmitted to the anti-collision shell 22, the impact force is buffered and cleared through the matching of the arranged fixing block 18 and the buffer spring 19, so that the impact force is weakened when being transmitted to the anti-collision layer 15, the anti-collision effect on the pipeline body 1 is achieved, the external hook is hung in the hanging hole 25 formed in the hook 24, the anti-collision shell 22 is driven to rise through the hanging hole 25, the effect of facilitating transportation of the pipeline body 1 is achieved, when the hook 24 does not need to be used, only the extension plates 26 and the fixture blocks 27 need to be pressed down, the fixture block 27 is connected with the fixture groove 28 in a clamping manner, so that the effect of accommodating the heat-preservation filling cotton 14 can be achieved.

In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A heat-preservation unfreezing type pipe with a closed-cell foaming heat-preservation layer comprises a pipeline body (1), a heat-preservation foaming filling layer (2), a partition plate (3), a sliding groove (4), a baffle plate (5), a movable hole (6), a movable connecting rod (7), a mounting head (8), a connecting shaft (9), a rocker (10), a through rod (11), a stop block (12), a stop block (13), heat-preservation filling cotton (14), an anti-collision layer (15), a fixing ring (16), an anti-slip pad (17), a fixing block (18), a buffer spring (19), a fastening plate (20), a fastening bolt (21), an anti-collision shell (22), a movable groove (23), a hook (24), a hanging hole (25), an extension plate (26), a clamp block (27), a clamping groove (28), a slide block (29), a knob (30), a connecting spring (31), a regulating block (32) and a protection pad (33), the pipeline is characterized in that a heat-insulating foaming filling layer (2) is arranged outside the pipeline body (1), heat-insulating filling cotton (14) is fixedly arranged outside the heat-insulating foaming filling layer (2), an anti-collision layer (15) is fixedly arranged outside the heat-insulating filling cotton (14), a plurality of partition plates (3) are fixedly connected to the inner wall of the heat-insulating foaming filling layer (2), a shielding plate (5) is arranged between every two adjacent partition plates (3), two movable holes (6) are symmetrically formed in the middle of each shielding plate (5), movable connecting rods (7) penetrate through the middle of each movable hole (6) in a movable mode, one end of each movable connecting rod (7) is fixedly connected with an installing head (8), one end of each installing head (8) is fixedly installed with a connecting shaft (9), and a rocker (10) is fixedly connected to the inner wall of each connecting shaft (9), a plurality of the outer wall of rocker (10) all moves through and has run through a plurality of pole (11), a plurality of the equal fixedly connected with stopper (13) of one end of running through pole (11).

2. The heat-insulation unfreezing type pipe with the closed-cell foaming heat-insulation layer according to claim 1 is characterized in that the inner walls of the shielding plates (5) are connected with the outer wall of the adjacent shielding plate (3) in a sliding mode, a plurality of sliding grooves (4) are formed in the bottom end of the inner wall of the heat-insulation foaming filling layer (2), sliding blocks (29) are connected to the inner walls of the sliding grooves (4) in a sliding mode, and the top ends of the sliding blocks (29) are fixedly connected with the bottom end of the adjacent shielding plate (5).

3. The heat-preservation and unfreezing type pipe with the closed-cell foamed heat-preservation layer is characterized in that a stop block (12) is fixedly connected to the other ends of the movable holes (6), and the size of the stop blocks (12) is larger than that of the movable holes (6).

4. The heat-preservation and unfreezing type pipe with the closed-cell foaming heat-preservation layer is characterized in that a connecting spring (31) is fixedly connected to the back of the inner wall of each shielding plate (5), an adjusting block (32) is fixedly connected to one end of each connecting spring (31), and a protective pad (33) is fixedly connected to one end of each adjusting block (32).

5. The heat-preservation and unfreezing type pipe with the closed-cell foaming heat-preservation layer is characterized in that fixing rings (16) are sleeved on two sides of the outer wall of the anti-collision layer (15), anti-collision shells (22) are arranged outside the fixing rings (16), the outer wall of each fixing ring (16) is symmetrically connected with a plurality of fixing blocks (18), a plurality of buffer springs (19) are fixedly connected to one ends of the buffer springs (19) and the inner wall of the adjacent anti-collision shell (22), two anti-slip pads (17) are fixedly connected to the inner wall of each fixing ring (16), and the inner walls of the anti-slip pads (17) are attached to the outer wall of the anti-collision layer (15).

6. The thermal insulation and unfreezing type pipe with the closed-cell foaming thermal insulation layer is characterized in that fastening plates (20) are fixedly connected to two ends of each of two fixing rings (16), one end of each of two adjacent fastening plates (20) is in threaded connection through a set fastening bolt (21), and one end of each of two fastening bolts (21) is fixedly connected with a knob (30).

7. The heat-insulation and unfreezing type pipe with the closed-cell foamed heat-insulation layer is characterized in that two movable grooves (23) are symmetrically formed in the outer walls of the two anti-collision shells (22), hooks (24) are slidably connected to the inner walls of the two movable grooves (23), and hanging holes (25) are formed in the middles of the two hooks (24).

8. The heat-insulation and unfreezing type pipe with the closed-cell foamed heat-insulation layer is characterized in that extension plates (26) are fixedly connected to the bottom ends of the two hanging holes (25), the sizes of the two extension plates (26) are larger than that of the movable groove (23), and clamping blocks (27) are fixedly connected to two sides of the bottom ends of the two extension plates (26).

9. The heat-preservation and thawing type pipe with the closed-cell foamed heat-preservation layer as claimed in claim 1, wherein two clamping grooves (28) are symmetrically formed in the outer walls of the two fixing rings (16), and the outer walls of the plurality of clamping blocks (27) are connected with the inner walls of the adjacent clamping grooves (28) in a clamping manner.