CN215787925U - Three-pipe coaxial positioning device and tool - Google Patents

Abstract

The utility model provides a three-pipe coaxial positioning device and a tool, wherein a first positioning piece is coaxially fixed in a first connecting pipe for initial positioning, a first driving rod is arranged on the axis of the first positioning piece and the axis of a corresponding tensioning structure and is connected with the first positioning piece and the corresponding tensioning structure, the tensioning piece on the tensioning structure is driven by the first driving rod and simultaneously extends outwards to be pressed against the inner wall of a second connecting pipe, so that the second connecting pipe is fixed; the positioning assembly is coaxially fixed in the third connecting pipe, the second driving rod sequentially and coaxially penetrates through the positioning assembly and the corresponding tensioning structure, the corresponding tensioning piece is driven by the second driving rod, and meanwhile, the second driving rod extends outwards to abut against the inner wall of the second connecting pipe, so that the third connecting pipe and the second connecting pipe are coaxially fixed. The coaxiality of the second connecting pipe, the first connecting pipe and the third connecting pipe is limited by the coaxiality of the first positioning piece, the positioning assembly and the corresponding tensioning structure, so that the second connecting pipe, the first connecting pipe and the third connecting pipe are not affected by cold and heat deformation in the welding process, and the coaxiality of the three pipes before and after machining is guaranteed.

Description

Three-pipe coaxial positioning device and tool

Technical Field

The utility model relates to the technical field of positioning devices, in particular to a three-pipe coaxial positioning device and a tool.

Background

In daily life and production, long pipe assemblies are widely used, such as drain pipes, natural gas transmission pipelines and the like, and because of the large volume and length of the long pipe assemblies, a short pipe section is generally produced first, and the prefabricated pipe sections are connected into a complete system section by section. In construction, different connection methods are selected according to the material of the used pipe. The common steel pipes are connected by screw thread, flange, welding, socket joint, pipe bonding, etc.

In the existing valve body pipe assembly in the valve field, a welding method is generally adopted to connect pipe sections, welding interfaces are firm and tight, and the strength of welding seams generally reaches more than 85% of the strength of the pipes and even exceeds the strength of base materials. The welding connection is the direct connection between the pipe sections, the structure is simple, and the pipeline is beautiful and neat. And the interface is tight, need not pack, reducible maintenance work.

However, many valve bodies are precision parts, so that the requirement for coaxiality between multiple pipes in a pipe assembly is very high, thermal changes such as heating and cooling in a welding process are rapidly carried out in a local range, expansion and contraction deformation are restrained to generate plastic deformation, and after welding is completed and cooled to normal temperature, the plastic deformation is remained to generate welding deformation, so that the coaxiality between the multiple pipes is influenced. There is therefore a need for a device that can ensure coaxiality between multiple tubes at the time of the welding process.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defects of low equipment pressure test efficiency and high test cost in the prior art.

Therefore, the utility model provides a three-tube coaxial positioning device, which comprises:

the first positioning piece is suitable for being penetrated and coaxially fixed in the tube cavity of the first connecting tube;

the positioning assembly is suitable for being penetrated and coaxially fixed in a tube cavity of the reducing third connecting tube;

the two groups of tensioning structures are coaxially arranged at one end of the first positioning piece together with the first positioning piece and are suitable for extending into the cavity of the first positioning piece from one end of the second connecting pipe; the other group of tensioning structures and the positioning assembly are coaxially arranged at one end of the positioning assembly and are suitable for extending into the tube cavity of the positioning assembly from the other end of the second connecting tube;

the first driving rod is sequentially coaxially and movably arranged on the first positioning piece and the tensioning structure positioned on the first positioning piece in a penetrating way;

the second driving rod is coaxially and movably arranged on the positioning assembly and the tensioning structure on the positioning assembly in a penetrating way in sequence;

any one of the tensioning structures comprises at least two tensioning pieces arranged at intervals along the circumferential direction of the tensioning structure;

the first driving rod and the second driving rod are suitable for driving the tensioning pieces corresponding to the first driving rod to extend outwards or retract inwards at equal intervals along the radial direction of the tensioning structure.

Any of the tension structures further comprises:

a connecting member and a sliding member;

the connecting piece is coaxially fixed at one end of the first positioning piece or the positioning component;

the two limiting pieces are respectively fixed at one ends of the first driving rod and the second driving rod, and the sliding piece is suitable for abutting against the limiting pieces;

any one of the tension members slidably spans between the link member and the slide member.

Guide grooves are respectively formed in the positions, opposite to the connecting piece and the sliding piece; the guide groove is formed by inclining an outer peripheral edge of the connecting piece or the sliding piece to an axis thereof;

one end of the tensioning piece is slidably arranged in a guide groove on the connecting piece, and the other end of the tensioning piece is slidably arranged in a guide groove on the sliding piece.

Two ends of the tensioning piece are respectively provided with a limiting sliding chute;

the extending direction of the limiting sliding chute is arranged in the same direction as the inclined direction of the slope surface of the chute bottom of the guide chute;

the limiting sliding block corresponds to the limiting sliding groove and is respectively fixed on the connecting piece and the sliding piece; the limiting sliding block is arranged in the limiting sliding groove in a sliding mode.

Mounting parts are arranged on the connecting piece and the sliding piece corresponding to the guide grooves;

the limiting sliding block is a pin column which is fixedly arranged on the mounting part in a penetrating way, and one end of the pin column extends into the limiting sliding groove;

and the positioning pin is axially fixed on the mounting part in an intersecting manner and blocks the pin on a path along which the pin moves back to the tensioning piece.

The tensioning piece sets up threely, follows the connecting piece with the even interval distribution of circumference of slider.

A boss is arranged on one end face of the first positioning piece and the connecting piece, and a groove is arranged on the other end face of the first positioning piece and the connecting piece; the boss is suitable for being embedded in the groove.

The positioning assembly comprises:

the adapter is matched with the shape of the tube cavity of the third connecting tube and is provided with an adapter and an adapter rod; the diameter of the adapter is larger than that of the adapter; the adapter and the adapter rod are coaxial and arranged in a T shape; the adapter is suitable for being fixedly connected with the tensioning structure;

the second positioning piece is suitable for being sleeved on the adapter rod and tensioned on the inner wall of the third connecting pipe;

the adapter rod is suitable for being fixed on the second positioning piece;

the second driving rod sequentially and coaxially penetrates through the tensioning structure, the adapter piece and the second positioning piece and is suitable for being fixed on the second positioning piece.

The first driving rod and the second driving rod are both screw rods.

The limiting piece is double nuts.

The utility model provides a tool, which comprises the three-pipe coaxial positioning device;

the center of the base is provided with a through hole and is suitable for avoiding the first driving rod;

the first positioning piece is suitable for being fixed on the base;

the auxiliary sleeve is fixed on the base in a manner of being opposite to the first positioning piece and sleeved on the driving rod;

the first end cover is fixed at one end of the auxiliary sleeve; the first driving rod penetrates through the first end cover and is suitable for being fixed on the first end cover.

The end surface of the first positioning piece is in concave-convex fit with the surface of the base; the end surface of the auxiliary sleeve is in concave-convex fit with the surface of the base.

The technical scheme of the utility model has the following advantages:

1. the three-pipe coaxial positioning device provided by the utility model is coaxially fixed in a first connecting pipe through a first positioning piece for initial positioning, a first driving rod is arranged on the axis of the first positioning piece and the axis of a corresponding tensioning structure and is connected with the first positioning piece and the corresponding tensioning structure, then the tensioning structure coaxially arranged with the first positioning piece is stretched into a second connecting pipe, the tensioning piece on the tensioning structure is driven through the first driving rod, and meanwhile, the tensioning piece extends outwards to be pressed against the inner wall of the second connecting pipe, so that the second connecting pipe is fixed; the positioning assembly is coaxially fixed in the third connecting pipe, the second driving rod sequentially and coaxially penetrates through the positioning assembly and the corresponding tensioning structure, the corresponding tensioning structure is stretched into the second connecting pipe from the other end, the corresponding tensioning piece is driven by the second driving rod, and meanwhile, the tensioning piece stretches outwards to be pressed on the inner wall of the second connecting pipe, so that the third connecting pipe and the second connecting pipe are coaxially fixed. The second connecting pipe is limited to be coaxial with the first connecting pipe and the third connecting pipe respectively by the coaxiality of the first positioning piece and the corresponding tensioning structure and the coaxiality of the positioning assembly and the corresponding tensioning structure, so that the coaxiality of the three pipes is not influenced by cold and heat deformation in the welding process, after the three pipes are cooled to be shaped under a normal temperature state, the first positioning piece, the positioning assembly and the corresponding tensioning structures are taken out, and the coaxiality of the three pipes before and after processing is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a three-tube coaxial positioning device according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a tension structure in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a third connecting tube in the embodiment of the present invention.

Description of reference numerals:

10. a first connecting pipe; 20. a second connecting pipe; 30. a third connecting pipe; 1. a first positioning member; 2. a tensioning structure; 21. a tensioning member; 211. a limiting chute; 212. positioning pins; 213. a limiting slide block; 22. a connecting member; 23. a slider; 24. a limiting member; 25. a guide groove; 3. a first drive lever; 4. a base; 5. an auxiliary sleeve; 6. an end cap; 7. a positioning assembly; 71. an adapter; 711. an adapter; 712. a transfer lever; 72. a second positioning member; 8. a second drive lever; 91. a threaded cap; 92. a locking member.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

The embodiment provides a three-tube coaxial positioning device, as shown in fig. 1, which includes a first positioning member 1, a positioning assembly 7, two sets of tensioning structures 2, a first driving rod 3, and a second driving rod 8. The first positioning member 1 and the positioning assembly 7 are respectively connected with a group of tensioning structures 2.

The first positioning part 1 is coaxially fixed in the first connecting pipe 10 for initial positioning, the first driving rod 3 is arranged on the axis of the first positioning part 1 and the axis of the corresponding tensioning structure 2 and is connected with the first positioning part 1 and the corresponding tensioning structure 2, then the tensioning structure 2 coaxially arranged with the first positioning part 1 extends into the second connecting pipe 20, the tensioning part 21 on the tensioning structure 2 is driven by the first driving rod 3, and meanwhile, the first driving rod extends outwards to be pressed against the inner wall of the second connecting pipe 20, so that the second connecting pipe 20 is fixed; the positioning component 7 is coaxially fixed in the third connecting pipe 30, the second driving rod 8 sequentially and coaxially penetrates through the positioning component 7 and the corresponding tensioning structure 2, the corresponding tensioning structure 2 is stretched into the second connecting pipe 20 from the other end, the corresponding tensioning piece 21 is driven by the second driving rod 8, and meanwhile, the tensioning piece outwards stretches out to abut against the inner wall of the second connecting pipe 20, so that the third connecting pipe 30 and the second connecting pipe 20 are coaxially fixed. The coaxiality of the second connecting pipe 20, the first connecting pipe 10 and the third connecting pipe 30 is limited by the coaxiality of the first positioning piece 1 and the corresponding tensioning structure 2 and the coaxiality of the positioning assembly 7 and the corresponding tensioning structure 2, so that the coaxiality of the three pipes is not influenced by cold and heat deformation in the welding process, after the three pipes are cooled to be shaped under a normal temperature state, the first positioning piece 1, the positioning assembly 7 and the corresponding tensioning structure 2 are taken out, and the coaxiality of the three pipes before and after processing is ensured.

As shown in fig. 1 or 2, in the present embodiment, the first positioning element 1 is a positioning block having a T-shaped cross section, an outer diameter of a portion of the first positioning element 1 extending into the first connecting pipe 10 is the same as an inner diameter of the first connecting pipe 10, and a diameter of an end portion of the first positioning element facing the second connecting pipe 20 is smaller than the inner diameter of the first connecting pipe 10, so that a portion of the first positioning element 1 extends into the second connecting pipe 20 for effective connection.

Any group of tensioning structures 2 comprises a connecting piece 22 and a sliding piece 23, and in the embodiment, the connecting piece 22 and the sliding piece 23 are the same in structure, coaxial and arranged on the first driving rod 3 in a mirror image mode. The connecting piece 22 is coaxially fixed at one end of the first positioning piece 1 through a fastening piece such as a bolt, and a space which can slide relatively is reserved between the connecting piece 22 and the sliding piece 23. The end face of one of the first positioning piece 1 and the connecting piece 22 is provided with a boss, the end face of the other of the first positioning piece 1 and the connecting piece 22 is provided with a groove, and the boss is suitable for being embedded in the groove. In this embodiment, the end face of the first positioning member 1 is provided with a groove, the end face of the connecting member 22 is provided with a boss, and the boss and the groove are matched to realize limitation and ensure coaxiality thereof.

A limiting member 24 is disposed at one end of the first driving rod 3 located at the sliding member 23, and the sliding member 23 abuts against the limiting member 24. In this embodiment, the first driving rod 3 is a screw rod, the screw rod is in threaded connection with the first positioning member 1 and the connecting member 22, and the sliding member 23 is fixed at the end of the screw rod. The position limiting member 24 is a double nut fixed at the end of the screw, and as is well known, the double nut structure is firm in position limitation and is not easy to fall off. In the present embodiment, as shown in fig. 2, three tensioning members 21 are provided, and the three tensioning members 21 are evenly distributed along the circumferential direction of the connecting member 22 and the sliding member 23, and straddle the connecting member 22 and the sliding member 23, i.e. one end is slidably provided on the connecting member 22, and the other end is slidably provided on the sliding member 23. Of course, the tensioning members 21 may also be provided in four, five, etc., the specific number being determined according to specific needs. The connecting piece 22 and the sliding piece 23 are provided with guide grooves 25 at opposite positions, the guide grooves 25 are arranged from the peripheral edge of the connecting piece 22 or the sliding piece 23 to the axis of the connecting piece, in the embodiment, the two opposite side groove walls of the guide grooves 25 are parallel, and the groove bottom of the guide grooves 25 is a smooth slope surface inclined from the peripheral edge of the connecting piece 22 to the axis. The structure of the tensioning piece 21 is matched with the groove shape of the guide groove 25, the cross section of the tensioning piece is entirely trapezoidal, two sides of the trapezoid respectively correspond to the slope surfaces of the groove bottom of the guide groove 25, and the longer bottom edge of the trapezoid faces the outside of the guide groove 25 and is suitable for abutting against the inner wall of the second connecting pipe 20. The tensioning member 21 rides and slides in corresponding guide slots 25 in the link 22 and slide 23.

As shown in fig. 2, in the present embodiment, the two ends of the tensioning member 21 are respectively provided with a limiting sliding chute 211, and the extending direction of the limiting sliding chute 211 is arranged in the same direction as the inclined direction of the groove bottom slope surface of the guide groove 25. The connecting piece 22 and the sliding piece 23 are respectively provided with a mounting part corresponding to the guide groove 25, the mounting parts are respectively provided with a limiting slide block 213 corresponding to the limiting slide grooves 211 at the two ends of the tensioning piece 21, and the limiting slide blocks 213 are arranged in the corresponding limiting slide grooves 211 in a sliding manner. In this embodiment, the limiting sliding block 213 is a pin, the pin is fixed on the mounting portion in a penetrating manner, and one end of the pin extends into the limiting sliding groove 211. The detent pin 212 is fixed to the mounting portion axially across the pin and blocks the path of movement of the pin away from the tensioner 21 to prevent the pin from disengaging from the mounting position.

In this embodiment, the first connection pipe 10 is a bottom valve cover, the third connection pipe 30 is a valve cover bracket, and the second connection pipe 20 is a steel pipe coaxially connecting the bottom valve cover and the valve cover bracket. As shown in fig. 3, the valve cover bracket is a tubular structure with a hollow part in the middle. As shown in fig. 1, the positioning assembly 7 includes an adaptor 71 and a second positioning member 72. The adapter 71 is adapted to the lumen shape of the third connection tube 30 and has an adapter 711 and an adapter rod 712. The diameter of adapter 711 is greater than the diameter of switching pole 712, and adapter 711 and switching pole 712 are coaxial and the T-shaped setting. The adapter 711 is suitable for being fixedly connected to the connecting member 22 corresponding to the tensioning structure 2, and the connection manner between the adapter 711 and the connecting member 22 corresponding to the tensioning structure 2 is the same as that between the first positioning member 1 and the corresponding connecting member 22, which is not described herein again.

In this embodiment, the diameter of the third connecting pipe 30 is variable, that is, a protrusion for reducing the diameter of the pipe is provided inside the pipe cavity, the adaptor 71 extends into the third connecting pipe 30 from one end of the third connecting pipe 30, the adaptor rod 712 passes through the reduced pipe cavity, and the adaptor 711 has a larger diameter and cannot pass through the reduced pipe cavity. The second positioning element 72 extends into the cavity of the third connection tube 30 from the other end of the third connection tube 30 and is sleeved on the adapter rod 712, and the second positioning element 72 is embedded and tensioned between the adapter rod 712 and the inner wall of the third connection tube 30. The second positioning member 72 is symmetrically provided with threaded holes corresponding to the hollow-out portion of the bonnet support, and the second positioning member 72 and the adapter rod 712 are fixed together by screwing fastening bolts into the threaded holes and pressing against the outer wall surface of the adapter rod 712.

As shown in fig. 1, according to the limitation of the specific structure of the bonnet support, in this embodiment, a threaded cap 91 having an external thread is provided to correspond to the internal thread of the other end of the bonnet support away from the adapter 711, and the second positioning member 72 coaxially passes through the threaded cap 91 and is tightly fitted to the inner wall of the threaded cap 91. The threaded cap 91 located outside the bonnet support is symmetrically provided with threaded holes along the circumferential direction, the locking piece 92 is a handle with an external thread at the end, the handle is screwed in the corresponding threaded hole to fix the third connecting pipe 30 and the second positioning piece 72 together, and the handle and the fastening bolt located in the hollow portion form double limiting fixation. The end of the second positioning member 72 extending out of the threaded cap 91 is provided with an end cap 6, and the second driving rod 8 coaxially and sequentially passes through the tensioning structure 2 and the second positioning member 72 and is adapted to be fixed on the end cap 6 of the second positioning member 72. In this embodiment, the second driving rod 8 is also a screw, the second driving rod 8 is fixed on the end cover 6 through a nut, and when the nut at the end cover 6 is screwed, the second driving rod 8 moves axially along the second positioning element 72 and is limited by the limiting element 24 to drive the sliding element 23 to slide towards or away from the connecting element 22, so as to achieve the effect that the tensioning element 21 extends outwards or retracts inwards along the radial direction of the tensioning structure 2. In this embodiment, the operation steps of the three-tube coaxial positioning device are as follows:

the screw rod is screwed, the sliding part 23 and the connecting part 22 reach the maximum distance through the limit of the pin, and at the moment, the outer wall surface of the tensioning part 21 is not higher than the outer wall surface of the connecting part 22 or the sliding part 23, so that the screw rod can smoothly extend into the pipe cavity of the second connecting pipe 20.

The first positioning piece 1 and the tensioning structure 2 fixed at the end part of the first positioning piece are plugged from one end of the first connecting pipe 10, the tensioning structure 2 penetrates out of the other end of the first connecting pipe 10 and extends into the second connecting pipe 20, and the first positioning piece 1 positioned in the first connecting pipe 10 is tightly matched with the inner wall of the first connecting pipe 10 to form coaxial fixation.

The screw is turned in the opposite direction, so that the sliding part 23 gradually approaches the connecting part 22, and the three tensioning members 21 slide along the respective guide slots 25 and extend outwards at equal intervals in the radial direction of the tensioning structure 2 and are pressed against the inner wall of the second connecting pipe 20, thereby completing the coaxial positioning of the first connecting pipe 10 and the second connecting pipe 20.

Another group of tensioning structures 2 are installed at the end of the second driving rod 8, the adapter 71 is coaxially sleeved on the second driving rod 8, the adapter 711 is fixedly connected with the connecting piece 22, and the second driving rod extends from one end of the third connecting pipe to extend from the other end, so that the adapter 712 passes through the reduced pipe diameter. The second positioning member 72 is inserted into the threaded cap 91 and screwed to the end of the third connecting pipe 30, and then the second positioning member 72 is inserted into the third connecting pipe 30 from the end of the threaded cap 91 and is sleeved on the adapter rod 712. The tensioning structure 2 corresponding to the second positioning member 72 is extended into the cavity of the second connecting pipe 20 from the other end of the second connecting pipe 20, the second connecting pipe 20 is connected to the end face of the third connecting pipe 30, then the fastening bolt and the locking member 92 at the hollow part of the third connecting pipe 30 are screwed, and finally the end cover 6 passes through the second driving rod 8 and is fixed on the second positioning member 72 and the driving nut is screwed. The driving nut is screwed to drive the tensioning structure 2 corresponding to the second positioning element 72 to be tensioned on the inner wall of the second connecting pipe 20, so as to complete the coaxial positioning of the third connecting pipe 30 and the second connecting pipe 20.

When the positioning device is disassembled after the first connecting pipe 10, the second connecting pipe 20 and the third connecting pipe 30 are welded together as a whole, the first positioning member 1 together with the corresponding tension structure 2 is withdrawn from the end of the first connecting pipe 10. And respectively unscrewing the fastening bolt and the locking piece 92 positioned in the hollow part of the third connecting pipe 30, unscrewing the nut positioned on the end cover 6 of the second positioning piece 72, withdrawing the second positioning piece 72 from one end positioned in the threaded cap 91, moving the second positioning rod and the tensioning structure 2 and the adaptor 71 thereon along the second connecting pipe 20 and withdrawing from the end part of the first connecting pipe 10, detaching the threaded cap 91, and completing the integral detachment of the positioning device.

As a first alternative embodiment of the embodiment 1, the first driving rod 3 or the second driving rod 8 can be a smooth rod, and the relative movement of the connecting member 22 and the sliding member 23 is driven by manual pushing and pulling to realize the synchronous outward extension or inward retraction of the tensioning member 21.

Example 2

The present embodiment provides a tool, as shown in fig. 1, including the three-tube coaxial positioning device in embodiment 1, a base 4, an auxiliary sleeve 5, and an end cover 6.

The end surface of the first positioning piece 1 is in concave-convex fit with the surface of the base 4, and the end surface of the auxiliary sleeve 5 is in concave-convex fit with the surface of the base 4. As shown in fig. 2, the first positioning member 1 and the auxiliary sleeve 5 are installed at opposite sides of the base 4, respectively.

The base 4 may be placed directly on the table or may be shaped for holding by other holding means. A through hole is formed in the center of the base 4 and used for avoiding the first driving rod 3, a step surface is arranged at one end, away from the tensioning structure 2, of the first positioning piece 1, the step surface is matched with the edge of the through hole of the base 4, and the first positioning piece 1 is fixed on the base 4 through a bolt. A groove is formed in one side, back to the first positioning piece 1, of the base 4, and the auxiliary sleeve 5 is embedded in the groove and fixed in the groove through bolts. Keep away from the one end of the auxiliary sleeve 5 of base 4 and set up end cover 6, drive screw stretches into the 5 inner chambers of auxiliary sleeve from the through-hole and wears out from end cover 6 to through the nut on the end cover 6 and 5 spacing connections of auxiliary sleeve. When the nut on the end cap 6 is screwed, the screw is driven to reciprocate, and the tension member 21 is driven to extend outward or retract inward.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (12)

1. A three-tube coaxial positioning device, comprising:

the first positioning piece (1) is suitable for being arranged in a penetrating way and is coaxially fixed in a tube cavity of the first connecting tube (10);

the positioning assembly (7) is suitable for being arranged in a penetrating way and coaxially fixed in a pipe cavity of the reducing third connecting pipe (30);

the two groups of tensioning structures (2), one group of tensioning structures (2) and the first positioning piece (1) are coaxially arranged at one end of the first positioning piece (1) and are suitable for extending into a pipe cavity of the second positioning piece from one end of a second connecting pipe (20); the other group of tensioning structures (2) and the positioning assembly (7) are coaxially arranged at one end of the positioning assembly (7) and are suitable for extending into the cavity of the positioning assembly from the other end of the second connecting pipe (20);

the first driving rod (3) is sequentially coaxially and movably arranged on the first positioning piece (1) and the tensioning structure (2) positioned on the first positioning piece in a penetrating way;

the second driving rod (8) is sequentially coaxially and movably arranged on the positioning component (7) and the tensioning structure (2) positioned on the positioning component in a penetrating way;

any one of the tensioning structures (2) comprises at least two tensioning pieces (21) arranged at intervals along the circumferential direction of the tensioning structure;

the first driving rod (3) and the second driving rod (8) are suitable for driving the tensioning pieces (21) corresponding to the first driving rod to extend outwards or retract inwards at equal intervals along the radial direction of the tensioning structure (2).

2. The tri-tube coaxial positioning device according to claim 1, wherein any of the tensioning structures (2) further comprises:

a link (22) and a slider (23);

the connecting piece (22) is coaxially fixed at one end of the first positioning piece (1) or the positioning component (7);

the two limiting parts (24) are respectively fixed at one ends of the first driving rod (3) and the second driving rod (8), and the sliding part (23) is suitable for abutting against the limiting parts (24);

any one of the tension members (21) is slidably spanned between the connecting member (22) and the sliding member (23).

3. The tri-tube coaxial positioning device according to claim 2, wherein the connecting member (22) and the sliding member (23) are provided with guide grooves (25) at opposite positions, respectively; the guide groove (25) is arranged obliquely to the axis thereof from the outer peripheral edge of the link (22) or the slider (23);

one end of the tensioning member (21) is slidably arranged in a guide slot (25) on the connecting member (22) and the other end is slidably arranged in a guide slot (25) on the sliding member (23).

4. The three-tube coaxial positioning device according to claim 3, wherein two ends of the tensioning member (21) are respectively provided with a limiting sliding groove (211);

the extending direction of the limiting sliding groove (211) is arranged in the same direction as the inclined direction of the groove bottom slope surface of the guide groove (25);

the limiting sliding block (213) is fixed on the connecting piece (22) and the sliding piece (23) corresponding to the limiting sliding groove (211); the limiting sliding block (213) is arranged in the limiting sliding groove (211) in a sliding mode.

5. The triple-tube coaxial positioning device according to claim 4, characterized in that the connecting member (22) and the sliding member (23) are provided with mounting portions corresponding to the guide grooves (25);

the limiting sliding block (213) is a pin which is fixedly arranged on the mounting part in a penetrating way, and one end of the pin extends into the limiting sliding groove (211);

and the positioning pin (212) is axially crossed and fixed on the mounting part with the pin column and is blocked on a path of the pin column moving back to the tensioning piece (21).

6. Triple-tube coaxial positioning device according to claim 5, characterized in that said tensioning members (21) are provided in three, evenly spaced along the circumference of said connecting member (22) and of said sliding member (23).

7. The tri-tube coaxial positioning device according to any one of claims 2-6, wherein a boss is provided on an end surface of one of the first positioning member (1) and the connecting member (22), and a groove is provided on an end surface of the other; the boss is suitable for being embedded in the groove.

8. The tri-tube coaxial positioning device according to any of claims 1-6, wherein the positioning assembly (7) comprises:

an adapter (71) adapted to the lumen shape of the third connection tube (30) and having an adapter (711) and an adapter rod (712); the diameter of the adapter (711) is larger than that of the adapter rod (712); the adapter (711) and the adapter rod (712) are arranged coaxially and in a T shape; the adapter (711) is suitable for fixedly connecting the tensioning structure (2);

the second positioning piece (72) is suitable for being sleeved on the adapter rod (712) and tensioned on the inner wall of the third connecting pipe (30);

the adapter rod (712) is suitable for being fixed on the second positioning piece (72);

the second driving rod (8) sequentially and coaxially penetrates through the tensioning structure (2), the adapter piece (71) and the second positioning piece (72) and is suitable for being fixed on the second positioning piece (72).

9. The triple-tube coaxial positioning device according to claim 2, characterized in that the first driving rod (3) and the second driving rod (8) are both screws.

10. The triple-tube coaxial positioning device according to claim 9, wherein the stop (24) is a double nut.

11. A tooling, characterized by comprising a tri-tube coaxial positioning device according to any one of claims 1 to 10;

the center of the base (4) is provided with a through hole and is suitable for avoiding the first driving rod (3);

the first positioning piece (1) is suitable for being fixed on the base (4);

the auxiliary sleeve (5) is fixed on the base (4) in a manner of being opposite to the first positioning piece (1) and sleeved on the driving rod;

the first end cover (6) is fixed at one end of the auxiliary sleeve (5); the first driving rod (3) penetrates through the first end cover (6) and is suitable for being fixed on the first end cover (6).

12. The tooling according to claim 11, wherein the end surface of the first positioning member (1) is in concave-convex fit with the surface of the base (4); the end surface of the auxiliary sleeve (5) is in concave-convex fit with the surface of the base (4).

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