阅读说明：本技术 一种张拉锁紧锚杆 (Tensioning locking anchor rod ) 是由 周俊 王朝鹏 于 2020-10-14 设计创作，主要内容包括：本发明涉及建筑加固结构领域,特别涉及一种张拉锁紧锚杆,包括锚杆主体,所述锚杆主体的外表面设置有锁定带,所述锁定带的外表面设置有锁定块,所述锚杆主体的外表面靠近锁定带的一侧设置有垫板,所述锚杆主体的内侧设置有固定板,所述固定板与锚杆主体之间设置有固定螺栓,所述锚杆主体的一侧外表面靠近锁定带的一侧设置有防脱槽,所述锁定块的内侧设置有隔板。本发明所述的一种张拉锁紧锚杆,设有锁定带、波纹以及麻花杆,可以便捷的调节锚杆主体的粗度尺寸,从而可以方便插入钻孔内固定,且通过麻花杆的螺旋状与波纹可以增大锚杆主体与钻孔内壁的摩擦阻力,从而防止锚杆脱落,这种张拉锁紧锚杆将会带来更好的使用前景。(The invention relates to the field of building reinforced structures, in particular to a tension locking anchor rod, which comprises an anchor rod main body, wherein a locking belt is arranged on the outer surface of the anchor rod main body, a locking block is arranged on the outer surface of the locking belt, a base plate is arranged on one side, close to the locking belt, of the outer surface of the anchor rod main body, a fixing plate is arranged on the inner side of the anchor rod main body, a fixing bolt is arranged between the fixing plate and the anchor rod main body, a drop-proof groove is arranged on one side, close to the locking belt, of the outer surface of one side of the anchor. The tension locking anchor rod is provided with the locking belt, the corrugations and the twist rod, the thickness of the anchor rod main body can be conveniently adjusted, so that the anchor rod main body can be conveniently inserted into a drilled hole for fixing, the friction resistance between the anchor rod main body and the inner wall of the drilled hole can be increased through the spiral shape and the corrugations of the twist rod, the anchor rod is prevented from falling off, and the tension locking anchor rod can bring better use prospect.)

1. The utility model provides a stretch-draw locking stock, includes stock main part (1), its characterized in that: the surface of stock main part (1) is equipped with locking area (2), the surface in locking area (2) has linked firmly locking block (3), the surface of stock main part (1) has backing plate (4) near one side welding of locking area (2), the inboard of stock main part (1) has linked firmly fixed plate (6), fixed mounting has fixing bolt (7) between fixed plate (6) and the stock main part (1), one side surface of one side of stock main part (1) is provided with anticreep groove (9) near one side of locking area (2), the inboard of locking block (3) has linked firmly baffle (11), the inboard rotation of baffle (11) is connected with rotates calorie axle (12), the inboard surface in locking area (2) is provided with latch (13), be provided with pivot (14) between rotation calorie axle (12) and baffle (11), a bolt (16) is arranged on one side, close to the rotating clamping shaft (12), of the outer surface of the rotating shaft (14); the bolt (16) can be inserted between the rotating clamping shaft 12 and the rotating shaft 14 to lock the rotating clamping shaft 12;

a twist rod (8) is fixedly installed on one side of the fixing plate (6), the twist rod (8) is in a spiral shape, a welding strip is arranged between the twist rod (8) and the fixing plate (6), the twist rod (8) is fixedly connected with the fixing plate (6) through the welding strip, and the twist rod (8) is fixedly connected with the anchor rod main body (1) through the fixing plate (6);

the surface that rotates calorie axle (12) has linked firmly gear (15), the size of gear (15) and the size looks adaptation of latch (13), rotate calorie axle (12) and take (2) swing joint through pivot (14) and locking, locking area (2) are through latch (13) and gear (15) swing joint, locking area (2) are through rotating calorie axle (12) and locking piece (3) swing joint, stock main part (1) is the C font and has the seam pipe.

2. A tension lock bolt as defined in claim 1, wherein: the outside of bolt (16) is provided with snap fastener (17), the size of rotating card axle (12) and pivot (14) interval is the same with the front end size of bolt (16), the inboard of bolt (16) is provided with the slip tube, bolt (16) are through slip tube and pivot (14) swing joint.

3. A tension lock bolt as defined in claim 1, wherein: one side that the surface of stock main part (1) is close to backing plate (4) is provided with ripple (5), be provided with the welded plate between ripple (5) and stock main part (1), ripple (5) are through welded plate and stock main part (1) fixed connection, the quantity of ripple (5) is a plurality of groups, ripple (5) are the equidistance straight line and arrange the surface in stock main part (1).

4. A tension lock bolt as defined in claim 1, wherein: the rear end that the inboard surface of stock main part (1) is close to fixed plate (6) is provided with fixed screw (10), be provided with the screw thread between fixing bolt (7) and fixed screw (10), fixing bolt (7) are through screw thread and fixed screw (10) swing joint, fixing bolt (7) are five groups with the quantity of fixed screw (10), fixing bolt (7) all are the cross with fixed screw (10) and arrange.

5. A tension lock bolt as defined in claim 3, wherein: the outer surface of the anchor rod main body (1) is also provided with a group of auxiliary locking belts (18); the auxiliary locking belts (18) are uniformly distributed at intervals between the base plate (4) and the fixing plate (6), one end of each auxiliary locking belt (18) is fixedly connected with a convex block (19), the other end of each auxiliary locking belt is fixedly connected with a group of auxiliary blocks (20), and each auxiliary block (20) is provided with a clamping hole (21); the lug (19) can be inserted into the clamping hole (21) to be locked with the auxiliary block (20), and the lug (19) and the auxiliary block (20) are both made of metal aluminum materials.

6. A tension lock bolt as defined in claim 5, wherein: the section of the lug (19) is trapezoidal, the length of the upper bottom of the trapezoid is smaller than that of the lower bottom of the trapezoid, and the lower bottom surface of the lug (19) is fixedly connected with the auxiliary locking belt (18).

Technical Field

The invention relates to the field of building reinforced structures, in particular to a tension locking anchor rod.

Background

The anchor rod is the most basic component of roadway support in the contemporary coal mine, and the anchor rod reinforces the surrounding rocks of the roadway together to support the surrounding rocks per se. The conventional anchor rod is not only used for mines, but also used in engineering technology for reinforcing main bodies of slopes, tunnels and dams. The anchor rod is used as a tension member penetrating into the stratum, one end of the anchor rod is connected with an engineering structure, the other end of the anchor rod penetrates into the stratum, the whole anchor rod is divided into a free section and an anchoring section, the free section is an area for transmitting the tension at the head of the anchor rod to an anchoring body, and the function of the free section is to apply prestress on the anchor rod; can effectively strengthen building strength through the stock, but after traditional stock inserted the anchor eye, stock and anchored frictional force were not enough, lead to the pulling force not enough, and easy pine takes off, and can not adjust the stock thickness well, and in unable convenient inserting the anchor eye, lead to the construction degree of difficulty higher, therefore we have proposed this kind of stretch-draw locking stock.

Disclosure of Invention

The invention mainly aims to provide a tension locking anchor rod which can effectively solve the problems in the background technology.

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

a tensioning locking anchor rod comprises an anchor rod main body, wherein a locking belt is arranged on the outer surface of the anchor rod main body, a locking block is fixedly connected to the outer surface of the locking belt, a backing plate is welded on one side, close to the locking belt, of the outer surface of the anchor rod main body, a fixing plate is fixedly connected to the inner side of the anchor rod main body, a fixing bolt is fixedly installed between the fixing plate and the anchor rod main body, an anti-falling groove is formed in one side, close to the locking belt, of the outer surface of one side of the anchor rod main body, a partition plate is fixedly connected to the inner side of the locking block, a rotating clamping shaft is rotatably connected to the inner side of the partition plate, clamping teeth are arranged on the outer surface of the inner side of the locking; the bolt can be inserted between the rotating clamping shaft and the rotating shaft to lock the rotating clamping shaft;

a twist rod is fixedly mounted on one side of the fixing plate, the twist rod is in a twist spiral shape, a welding strip is arranged between the twist rod and the fixing plate, the twist rod is fixedly connected with the fixing plate through the welding strip, and the twist rod is fixedly connected with the anchor rod main body through the fixing plate;

the surface of rotating the card axle has linked firmly the gear, the size of gear and the size looks adaptation of latch, rotate the card axle and take swing joint through pivot and locking, the locking area passes through latch and gear swing joint, the locking area is through rotating card axle and locking block swing joint, the stock main part is the C font and has the seam pipe.

Preferably, the outer side of the bolt is provided with a snap fastener, the size of the distance between the rotary clamping shaft and the rotary shaft is the same as the size of the front end of the bolt, the inner side of the bolt is provided with a sliding pipe, and the bolt is movably connected with the rotary shaft through the sliding pipe.

Preferably, one side that the surface of stock main part is close to the backing plate is provided with the ripple, be provided with the welded plate between ripple and the stock main part, the ripple passes through welded plate and stock main part fixed connection, the quantity of ripple is a plurality of groups, the ripple is the equidistance straight line and arranges the surface at the stock main part.

Preferably, the rear end that the inboard surface of stock main part is close to the fixed plate is provided with fixed screw, be provided with the screw thread between fixing bolt and the fixed screw, fixing bolt passes through screw thread and fixed screw swing joint, fixing bolt is five groups with the quantity of fixed screw, fixing bolt all is the cross with fixed screw and arranges.

Preferably, the outer surface of the anchor rod main body is further provided with a group of auxiliary locking belts; the auxiliary locking belts are evenly distributed at intervals between the base plate and the fixed plate, one end of each auxiliary locking belt is fixedly connected with a convex block, the other end of each auxiliary locking belt is fixedly connected with a group of auxiliary blocks, and each auxiliary block is provided with a clamping hole; the lug can be inserted into the clamping hole to be locked with the auxiliary block, and the lug and the auxiliary block are both made of metal aluminum materials.

Preferably, the cross section of the lug is trapezoidal, the length of the upper bottom of the trapezoid is smaller than that of the lower bottom of the trapezoid, and the lower bottom surface of the lug is fixedly connected with the auxiliary locking belt.

Compared with the prior art, the invention has the following beneficial effects:

1. the spiral twist rod is fixedly connected with the anchor rod main body by the fixing plate and the fixing bolt on the inner side of the anchor rod main body, so that the resistance between the twist rod and the anchoring section is greatly enhanced together with the structure of the corrugation, the anchor rod main body is difficult to pull out once construction is completed, and the building is better fixed;

2. according to the invention, the C-shaped size of the anchor rod main body can be effectively changed through the movable connection of the locking belt and the locking block, so that the size can be well reduced before the anchor rod main body is inserted into an anchor hole, the installation is convenient, the size of the anchor rod main body can be expanded in the inner size of the anchoring section through loosening the locking belt and the locking block after the assembly is completed, the stability is enhanced, and the using effect is better compared with that of the traditional mode.

3. The auxiliary locking belts are arranged on the outer side of the anchor rod main body, so that the diameter of the anchor rod main body is locked and adjusted in multiple sections, the diameter of the anchor rod main body with a longer length can be kept consistent, the anchor rod main body can be inserted into an anchor hole more conveniently, the temperature of the convex block and the auxiliary block made of metal aluminum is reduced after the convex block and the auxiliary block penetrate into the ground layer, and the convex block and the auxiliary block shrink when encountering cold under the action of thermal expansion and cold contraction, so that the convex block is separated from the clamping hole, and the recovery of the anchor rod main body is realized.

Drawings

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

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

FIG. 3 is a cross-sectional view of the locking block of the present invention;

FIG. 4 is a cross-sectional view of the latch of the present invention;

FIG. 5 is a twist bar attachment diagram of the present invention;

FIG. 6 is a schematic view of the structure of the secondary locking band, the protrusion and the latch of the present invention;

in the figure: 1. an anchor body; 2. a locking strap; 3. a locking block; 4. a base plate; 5. corrugation; 6. a fixing plate; 7. fixing the bolt; 8. a twisted rod; 9. a drop-proof groove; 10. fixing screw holes; 11. a partition plate; 12. rotating the clamping shaft; 13. clamping teeth; 14. a rotating shaft; 15. a gear; 16. a bolt; 17. snapping; 18. a secondary locking strap; 19. a bump; 20. a secondary block; 21. and (4) a clamping hole.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 6, a tension locking anchor comprises an anchor body 1, a locking strip 2 is arranged on the outer surface of the anchor body 1, the outer surface of the locking belt 2 is fixedly connected with a locking block 3, one side of the outer surface of the anchor rod main body 1 close to the locking belt 2 is welded with a backing plate 4, the inner side of the anchor rod main body 1 is fixedly connected with a fixing plate 6, a fixing bolt 7 is fixedly arranged between the fixing plate 6 and the anchor rod main body 1, an anti-drop groove 9 is arranged on one side of the outer surface of one side of the anchor rod main body 1 close to the locking belt 2, a partition plate 11 is fixedly connected with the inner side of the locking block 3, the inner side of the clapboard 11 is rotationally connected with a rotary clamping shaft 12, the outer surface of the inner side of the locking belt 2 is provided with a clamping tooth 13, a rotating shaft 14 is arranged between the rotating clamping shaft 12 and the partition plate 11, and a bolt 16 is arranged on one side, close to the rotating clamping shaft 12, of the outer surface of the rotating shaft 14; the bolt 16 can be inserted between the rotating clamping shaft 12 and the rotating shaft 14 to lock the rotating clamping shaft 12;

a twist rod 8 is fixedly installed on one side of the fixing plate 6, the twist rod 8 is in a twist spiral shape, a welding strip is arranged between the twist rod 8 and the fixing plate 6, the twist rod 8 is fixedly connected with the fixing plate 6 through the welding strip, and the twist rod 8 is fixedly connected with the anchor rod main body 1 through the fixing plate 6;

the surface that rotates calorie axle 12 has linked firmly gear 15, the size of gear 15 and the size looks adaptation of latch 13, rotate calorie axle 12 through pivot 14 and locking area 2 swing joint, locking area 2 is through latch 13 and gear 15 swing joint, locking area 2 is through rotating calorie axle 12 and 3 swing joint of locking block, stock main part 1 is the C font and has the seam pipe. During operation, after a traditional anchor rod is inserted into an anchor hole, due to the fact that the friction force of the anchor rod and anchoring is insufficient, the tension force is insufficient, the anchor rod is easy to loosen, the thickness of the anchor rod cannot be adjusted, the anchor rod is not convenient to insert into the anchor hole, and the overall construction difficulty is increased; and through setting the anchor rod body 1 into a C-shaped slotted pipe, before the anchor rod body 1 is inserted into the anchor hole, the locking belt 2 arranged on the outer ring of the anchor rod body 1 can be tensioned, when the locking belt 2 is tensioned, the inner ring of the locking belt 2 can contract, so that the gap on the anchor rod body 1 is pressed to be reduced, the diameter of the anchor rod body 1 is reduced, and in the tensioning process of the locking belt 2, the latch 13 arranged on the inner ring can be meshed and clamped with the gear 15 fixedly connected to the outer surface of the rotating latch shaft 12, and the gear 15 and the connected rotating latch shaft 12 are pulled to rotate on the outer side of the rotating shaft 14, when the diameter of the anchor rod body 1 is synchronously adjusted in place, at the moment, the size adjustment of the inner ring of the locking belt 2 stops, the meshed gear 15 and the connected rotating latch shaft 12 synchronously stop rotating, and the latch 16 arranged on the outer side is inserted between the rotating latch shaft 12 and the rotating, the gear 14 and the rotating clamp shaft 12 are locked, the size of the anchor rod body 1 is adjusted, and the outer diameter of the anchor rod body 1 is smaller than the diameter of an anchor hole, so that the anchor rod body can easily enter the anchor hole, and the difficulty of the anchor rod body 1 entering the anchor hole is reduced; the diameter-variable anchor rod main body 1 is arranged, so that the anchor rod main body 1 can be suitable for anchor holes with different sizes, the diameter of the anchor rod main body 1 is reduced through the locking belt 2 before the anchor rod main body is inserted into the anchor holes, the anchor rod main body 1 can be conveniently and conveniently inserted, the locking belt 2 is loosened after the anchor rod main body 1 is inserted into the anchor holes, the diameter of the anchor rod main body 1 is recovered to the initial state, the effect of expansion in the anchor holes is achieved, and the friction of the anchor rod main body 1 between the inner walls of the anchor holes is further increased.

In one embodiment of the present invention, a snap 17 is disposed on an outer side of the plug 16, a distance between the rotating shaft 12 and the rotating shaft 14 is the same as a front end of the plug 16, a sliding tube is disposed on an inner side of the plug 16, and the plug 16 is movably connected to the rotating shaft 14 through the sliding tube. During operation, the press button 17 can push the bolt 16 to insert between the rotating shaft 12 and the rotating shaft 14, so that the rotation of the rotating shaft 12 and the rotating shaft 14 is fixed, the size of the anchor rod body 1 is kept unchanged, and the action of inserting the anchor rod body 1 into an anchor hole is facilitated.

As an embodiment of the invention, one side of the outer surface of the anchor rod main body 1, which is close to the backing plate 4, is provided with corrugations 5, a welding plate is arranged between the corrugations 5 and the anchor rod main body 1, the corrugations 5 are fixedly connected with the anchor rod main body 1 through the welding plate, the number of the corrugations 5 is a plurality of groups, and the corrugations 5 are linearly arranged on the outer surface of the anchor rod main body 1 at equal intervals. When the anchor rod is in use, the locking of the locking belt 2 is released after the anchor rod main body 1 enters the anchor hole through the arranged corrugations 5, the anchor rod main body 1 is recovered and tightly extruded on the inner wall of the anchor hole, and the corrugations 5 on the anchor rod main body 1 extrude the inner wall of the anchor hole along with the inner wall to form the effect of embedding the inner wall, so that the friction between the anchor rod main body 1 and the inner wall of the anchor hole is further improved, and the probability that the anchor rod main body 1 is separated from the anchor hole in the use process is further reduced.

As an embodiment of the invention, the rear end of the inner outer surface of the anchor rod main body 1, which is close to the fixing plate 6, is provided with a fixing screw hole 10, a thread is arranged between the fixing bolt 7 and the fixing screw hole 10, the fixing bolt 7 is movably connected with the fixing screw hole 10 through the thread, the number of the fixing bolts 7 and the number of the fixing screw holes 10 are five, and the fixing bolts 7 and the fixing screw holes 10 are arranged in a cross shape.

As an embodiment of the invention, a set of secondary locking belts 18 is further arranged on the outer surface of the anchor rod body 1; the auxiliary locking belts 18 are evenly distributed at intervals between the base plate 4 and the fixing plate 6, one end of each auxiliary locking belt 18 is fixedly connected with a convex block 19, the other end of each auxiliary locking belt 18 is fixedly connected with a group of auxiliary blocks 20, and each auxiliary block 20 is provided with a clamping hole 21; the lug 19 can be inserted into the clamping hole 21 to be locked with the sub-block 20, and the lug 19 and the sub-block 20 are both made of metal aluminum materials. When the anchor rod is in operation, the anchor rod needs to be deeply buried into the ground, and the diameter of the longer anchor rod main body 1 is adjusted only by locking one locking belt 2, so that the diameter of the anchor rod main body 1 is adjusted in multiple sections by arranging one set of auxiliary locking belts 18 on the outer side of the anchor rod main body 1, when the anchor rod is installed, the locking can be realized only by inserting the convex blocks 19 into the corresponding locking holes 21, the locking adjustment of different sizes can be realized by different locking holes 21, so that the diameter of the longer anchor rod main body 1 can be kept consistent, the long anchor rod main body 1 can be inserted into the anchor holes more conveniently, the temperature of the convex blocks 19 and the auxiliary blocks 20 made of the metal aluminum is reduced after the anchor rod main body is deeply buried into the ground, the convex blocks 19 and the auxiliary blocks 20 contract when cooled under the action of thermal expansion and cold contraction, so that the convex blocks 18 are separated from the locking holes 21, and the recovery of the, if the underground temperature does not meet the requirement, dry ice can be manually put in, so that the aim of quickly reducing the temperature is fulfilled, the bump 19 and the clamping hole 21 can be quickly separated, and the speed of inserting the anchor rod into the anchor hole is further improved.

In one embodiment of the present invention, the cross section of the protrusion 19 is configured to be trapezoidal, the length of the upper bottom of the trapezoid is smaller than the length of the lower bottom, and the lower bottom surface of the protrusion 19 is fixedly connected to the secondary locking belt 18. During operation, the convex block 19 is arranged to be trapezoidal, the convex block 19 can penetrate through the corresponding clamping hole 21 only by being inclined during clamping, and then the convex block 19 is corrected, so that the lower bottom surface of the convex block 19 is in surface contact with the clamping hole 21 to achieve locking, the locking is rapid and convenient, the clamping hole 21 after cold contraction is enlarged, the synchronous convex block 19 is also reduced, and the reduced convex block 19 can be smoothly separated from the contracted clamping hole 21.

During operation, after a traditional anchor rod is inserted into an anchor hole, due to the fact that the friction force of the anchor rod and anchoring is insufficient, the tension force is insufficient, the anchor rod is easy to loosen, the thickness of the anchor rod cannot be adjusted, the anchor rod is not convenient to insert into the anchor hole, and the overall construction difficulty is increased; and through setting the anchor rod body 1 into a C-shaped slotted pipe, before the anchor rod body 1 is inserted into the anchor hole, the locking belt 2 arranged on the outer ring of the anchor rod body 1 can be tensioned, when the locking belt 2 is tensioned, the inner ring of the locking belt 2 can contract, so that the gap on the anchor rod body 1 is pressed to be reduced, the diameter of the anchor rod body 1 is reduced, and in the tensioning process of the locking belt 2, the latch 13 arranged on the inner ring can be meshed and clamped with the gear 15 fixedly connected to the outer surface of the rotating latch shaft 12, and the gear 15 and the connected rotating latch shaft 12 are pulled to rotate on the outer side of the rotating shaft 14, when the diameter of the anchor rod body 1 is synchronously adjusted in place, at the moment, the size adjustment of the inner ring of the locking belt 2 stops, the meshed gear 15 and the connected rotating latch shaft 12 synchronously stop rotating, and the latch 16 arranged on the outer side is inserted between the rotating latch shaft 12 and the rotating, the gear 14 and the rotating clamp shaft 12 are locked, the size of the anchor rod main body 1 is adjusted, and the outer diameter of the anchor rod main body 1 is smaller than the diameter of an anchor hole, so that the anchor rod main body can easily enter the anchor hole, the difficulty of the anchor rod main body 1 entering the anchor hole is reduced, and the drilled hole can be sealed by the backing plate 4; the diameter-variable anchor rod main body 1 is arranged, so that the anchor rod main body 1 can be suitable for anchor holes with different sizes, the diameter of the anchor rod main body 1 is reduced through the locking belt 2 before the anchor rod main body is inserted into the anchor holes, the anchor rod main body 1 can be conveniently and conveniently inserted, the locking belt 2 is loosened after the anchor rod main body 1 is inserted into the anchor holes, the diameter of the anchor rod main body 1 is recovered to the initial state, the effect of expansion in the anchor holes is formed, and the friction of the anchor rod main body 1 between the inner walls of the anchor holes is further increased;

the anchor rod needs to go deep into the ground, and the diameter of the longer anchor rod main body 1 is adjusted only by locking one locking belt 2, so the invention is difficult to realize, the invention arranges a group of auxiliary locking belts 18 on the outer side of the anchor rod main body 1, thereby the diameter of the anchor rod main body 1 is adjusted by locking in multiple sections, when in installation, the convex block 19 is only inserted into the corresponding clamping hole 21 to realize clamping, different clamping holes 21 can realize locking adjustment in different sizes, thus the diameter of the longer anchor rod main body 1 can be kept consistent, the insertion into the anchor hole is more convenient, the temperature of the convex block 19 and the auxiliary block 20 made of metal aluminum is reduced after going deep into the ground, the convex block 19 and the auxiliary block 20 contract under the action of thermal expansion and cold contraction, thereby the convex block 18 is separated from the clamping hole 21, and the recovery of the anchor rod main body 1 is realized, if the underground temperature does not meet the requirement, dry ice can be manually put in, so that the aim of quickly reducing the temperature is fulfilled, the bump 19 and the clamping hole 21 can be quickly separated, and the speed of inserting the anchor rod into the anchor hole is further increased;

through setting the lug 19 to trapezoidal, only need can pass corresponding block hole 21 with the lug 19 slope when the block, return lug 19 afterwards just for the lower bottom surface of lug 19 and block hole 21 surface contact can realize locking, and is swift convenient, meets the block hole 21 grow after the cold shrink, and synchronous lug 19 also diminishes, thereby makes the block hole 21 after the shrink break away from smoothly of lug 19 after diminishing.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.