CN111331166A

CN111331166A - Centering device for pipe fittings

Info

Publication number: CN111331166A
Application number: CN202010119940.8A
Authority: CN
Inventors: 郭岍桢; 李淋; 裴景玉
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-06-26

Abstract

The invention provides a pipe centering device which comprises a chuck, a plurality of sliding block structures and an axial positioning piece, wherein the chuck is in a ring shape, the number of the sliding block structures is more than or equal to three, the sliding block structures are uniformly distributed on the circumferential direction of the chuck, the sliding block structures can move along the radial direction of the chuck, each sliding block structure comprises a rolling end and a pipe wall acting end, the rolling ends are arranged in the inner circle of the chuck ring, the pipe wall acting ends are arranged outside the outer circle of the chuck ring, the axial positioning piece can move along the axial direction of the chuck in the inner circle of the chuck ring, the rolling ends can be in rolling connection with the axial positioning piece, and the pipe wall acting ends can interact with the inner wall of a pipe. The invention has simple structure and convenient operation, and can determine the axle center of the pipe fitting by the three-point centering principle.

Description

Centering device for pipe fittings

Technical Field

The invention relates to the field of mechanical positioning, in particular to a pipe fitting centering device.

Background

The global progress of the world is still continued, and the material transmission and the like have higher requirements than the past, especially the transmission in the aspect of energy. Such as oil production and transportation, a large number of steel pipes and steel pipe joints are required. The steel pipe coupling can be used only after the tight distance and the like of the steel pipe coupling are detected, the manual detection efficiency is low, the accuracy is poor, and the automatic or semi-automatic detection of the coupling needs to determine the axle center position of the coupling, so that a centering structure mechanical device of the type is needed. The mechanical device can realize the axis positioning of the pipe pieces and is a foundation for the detection and check automation or semi-automation of the pipe pieces. The prior art adopts an integral structure, is difficult to manufacture, install and maintain, does not consider the difficulty of replacing internal parts, has large friction force of each part, is difficult to increase the specification of the centering device, and cannot center large-specification pipe pieces.

Patent document No. CN201979314U discloses a centering body, which includes a positioning boss, wherein the positioning boss is provided with an axial through hole along the center; an inner expansion bolt with a conical bottom is arranged in the through hole; three positioning holes are transversely and uniformly distributed on the circumference of the positioning boss; positioning columns with semicircular heads at one ends are arranged in the positioning holes, the positioning columns are connected with the positioning bosses through guide nuts, and springs are arranged between the positioning columns and the guide nuts; and three positioning bolts are also arranged on the positioning bosses. The utility model relates to a from anchor clamps of centering has simple structure, and is economical and durable, safe and reliable, and application three point location principle adopts the interior expanding mandrel structure to make it have quick reliable characteristics of centering. However, the device is of an integral structure, internal parts are not easy to process and replace, the device is driven by screws, the size of the device is limited by the size of the screws, and each kinematic pair of the device has large friction and is easy to wear.

Disclosure of Invention

In view of the drawbacks of the prior art, it is an object of the present invention to provide a tube centering device.

The pipe fitting centering device provided by the invention comprises a chuck, a plurality of sliding block structures and an axial positioning piece, wherein the chuck is in a ring shape, the number of the sliding block structures is more than or equal to three, the sliding block structures are uniformly distributed on the circumferential direction of the chuck, the sliding block structures can move along the radial direction of the chuck, each sliding block structure comprises a rolling end and a pipe wall acting end, the rolling end is arranged in the inner circle of the chuck ring, the pipe wall acting end is arranged outside the outer circle of the chuck ring, the axial positioning piece can move along the axial direction of the chuck in the inner circle of the chuck ring,

the rolling end can be in rolling connection with the axial positioning piece, and the pipe wall acting end can interact with the inner wall of the pipe piece.

Preferably, the slider structure includes spring, slider and roller, the one end swing joint roller of slider forms rolling end, and the other end of slider is as the pipe wall action end, and the slider passes through the spring coupling on the chuck, the flexible direction of spring is along the radial direction of chuck.

Preferably, the sliding body is provided with a boss and a stud, one end of the stud is connected with the boss, the other end of the stud is a free end, the stud is arranged along the radial direction of the chuck, the spring is arranged between the boss and the chuck, and the stud is arranged inside the spring and plays a guiding role on the spring.

Preferably, the chuck comprises an upper chuck and a lower chuck, and the upper chuck is coaxially connected with the lower chuck;

the connecting surface of the upper chuck and the lower chuck is uniformly provided with radial grooves in the circumferential direction, and/or the connecting surface of the lower chuck and the upper chuck is uniformly provided with radial grooves in the circumferential direction;

the groove is internally provided with a guide rail along the radial direction of the chuck, the guide rail is connected with a sliding structure, and the sliding structure can slide on the guide rail along the radial direction of the chuck.

Preferably, the sliding body is provided with a sliding groove, the sliding groove can form a sliding pair with a guide rail arranged on the chuck, and the sliding body can slide on the guide rail arranged on the chuck along the radial direction of the chuck.

Preferably, the groove is provided with a positioning groove in the radial direction of the chuck, and the guide rail is fixed in the positioning groove by a fastener.

Preferably, one or more connecting holes are arranged on the end surface of the upper chuck and/or the lower chuck, and the connecting holes can be connected with external instruments.

Preferably, the axial positioning element comprises a shaft, a flange and a revolving body, the shaft is connected with the revolving body through the flange, the revolving body can be in rolling connection with the sliding block structure to form a rolling pair, and the revolving body is in a conical or circular truncated cone shape.

Preferably, the shaft, the flange and the revolving body are coaxially connected in sequence.

Preferably, the included angle between the generatrix of the revolving body and the axis is 25 degrees.

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

1. the invention has simple structure and convenient operation, and can determine the axle center of the pipe fitting by the three-point centering principle.

2. The invention adopts a double-layer structure of connecting the upper chuck and the lower chuck, and is convenient to manufacture, install and maintain.

3. The invention can realize the change of the device specification by manufacturing and replacing the rotary bodies with different sizes.

4. The invention adopts the technical means that the rollers and the revolving bodies are matched to form the rolling pairs, thereby reducing the friction force during the centering work and prolonging the service life of the device.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

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

FIG. 2 is a schematic view of the connection of the chuck and slider structure of the present invention;

fig. 3 is a schematic view of the connection between the slider structure and the lower chuck according to the present invention.

The figures show that:

stud-1 roller-7

Spring-2 lower chuck-8

Sliding body-3 shaft-9

Pin shaft-4 flange-10

Upper chuck-5 revolving body-11

Guide rail-6

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

The invention aims to detect and check the data such as the tight distance of the pipe fittings on the current production line based on manpower, and has the disadvantages of complicated steps, low efficiency, poor accuracy and high labor cost. In order to realize automation of data detection and check such as tight distance of the pipe, it is necessary to determine the axis position of the pipe. Therefore, the invention provides a mechanical device for determining the axle center of a pipe type piece.

The technical scheme adopted by the invention for solving the problems is as follows: the invention relates to a mechanical device for a pipe part centering structure, which comprises a revolving body 11, a shaft 9, a flange 10, an upper chuck 5, a lower chuck 8 and three sliding structures, wherein each sliding structure is connected with a guide rail 6 arranged on the lower chuck 8, and comprises a sliding body 3, a pin shaft 4, a roller 7, a stud 1 and a spring 2. The mechanical device designed by the invention is placed on the inner side of the pipe piece to be detected. Through the downward motion of axle 9, flange 10, solid of revolution 11 extension z axle (chuck axial direction), the downward motion of r axle (chuck radial direction) under the high side effect of three sliding construction between the sliding body 3 and guide rail 6 and recess on the solid of revolution 11 and roller 7, spring 2 is compressed, and elastic potential energy increases, and three sliding body 3 and pipe class spare inner wall complete contact, confirms that pipe class spare axle center position is exactly the axle center position of axle through three point-to-point centering principle. After the shaft center is determined, the shaft and the slider 3 need to be retracted. The connecting body of the shaft 9, the flange 10 and the revolving body 11 moves upwards along the z-axis, the elastic potential energy accumulated previously by the spring 2 is taken as a power source, and the three sliding structures move outwards along the axial direction under the action of a moving pair between the sliding body 3 and the guide rail 6 and a high side effect between the groove on the revolving body 11 and the roller 7, so that the sliding body 3 is retracted. The design of the device of the invention ensures that the specifications of the three sliding bodies 3 are the same and the error cannot be overlarge. The power source of the connection body of the shaft 9, the flange 10 and the revolving body 11 can be realized by an external motor. For different pipe sizes, the mechanical device can be manufactured in series. The device can be applied to mechanical devices which need to move pipe pieces to the determined axis positions. The invention has the advantages that the mechanical device is utilized to determine the axis position of the pipe type piece, thereby greatly reducing the labor work, improving the work efficiency and improving the work accuracy. In use, the invention should ensure that the shaft 9 is parallel to the axis of the tubular member and the chuck is perpendicular to the shaft 9. Preferably, when the invention is used, a plurality of sliding bodies are processed under the same condition, so that smaller tolerance is ensured.

The pipe centering device provided by the invention comprises a chuck, a plurality of sliding block structures and an axial positioning piece, wherein the chuck is in a ring shape, the number of the sliding block structures is more than or equal to three, the sliding block structures are uniformly distributed in the circumferential direction of the chuck, the sliding block structures can move along the radial direction of the chuck, each sliding block structure comprises a rolling end and a pipe wall acting end, the rolling end is arranged in the inner circle of the chuck ring, the pipe wall acting end is arranged outside the outer circle of the chuck ring, the axial positioning piece can move along the axial direction of the chuck in the inner circle of the chuck ring, the rolling end can be in rolling connection with the axial positioning piece, and the pipe wall acting end can interact with the inner wall of the pipe. The slider structure is matched with the axial positioning piece to enable the up-and-down motion of the axial positioning piece to be transmitted to the inside-and-outside motion of the r shaft of the slider structure.

The slider structure includes spring 2, sliding body 3 and roller 7, the one end swing joint roller 7 of sliding body 3 forms rolling end, and the other end of sliding body 3 is as the pipe wall effect end, and sliding body 3 passes through spring coupling on the chuck, the flexible direction of spring is along the radial direction of chuck. Be provided with boss and double-screw bolt 1 on the sliding body 3, the boss is connected to the one end of double-screw bolt 1, and the other end of double-screw bolt 1 is the free end, and double-screw bolt 1 sets up along the radial direction of chuck, spring 2 sets up between boss and chuck, and double-screw bolt 1 sets up and plays the guide effect to spring 2 in spring 2 is inside. The sliding body (3) is provided with a sliding groove which can form a sliding pair with a guide rail (6) arranged on the chuck, and the sliding body (3) can slide along the radial direction of the chuck on the guide rail (6) arranged on the chuck.

Preferably, one end of the sliding body 3 is provided with a U-shaped groove, the roller 7 is arranged in the U-shaped groove at one end of the sliding body 3 through the pin shaft 4, two walls of the U-shaped groove are provided with holes, the diameter of the pin shaft 4 is slightly larger than the hole at the tail end of the sliding body 3 and the inner diameter of the roller 7, the pin shaft 4 and the hole on the U-shaped groove are in interference fit, and the pin shaft 4 and the roller 7 are also in interference fit. Preferably, the spring 2 is long enough so that during use of the present invention, the spring 2 is always in compression, and the spring 2 acts as a source of power for the slide 3 to move inwardly along the r axis. When the shaft 9 moves downwards along the z-axis, the sliding body 3 moves outwards along the r-axis under the high pair of motion formed by the revolving body 11 and the roller 7, and the spring 2 is compressed. When the shaft 9 moves upwards along the z-axis, the spring 2 pushes the sliding body 3 to move inwards along the r-axis. Preferably, the sliding body 3 is provided with a sliding groove at the lower part thereof, and a sliding pair is formed between the sliding groove and the guide rail 6, so that the sliding body 3 only moves along the radial r axis.

The chuck comprises an upper chuck 5 and a lower chuck 8, and the upper chuck 5 is coaxially connected with the lower chuck 8; the surface of the upper chuck 5 connected with the lower chuck 8 is uniformly provided with radial grooves in the circumferential direction, and/or the surface of the lower chuck 8 connected with the upper chuck 5 is uniformly provided with radial grooves in the circumferential direction; the radial direction along the chuck is provided with guide rail 6 in the recess, and guide rail 6 connects sliding construction, and sliding construction can slide along the radial direction of chuck on guide rail (6). The inside constant head tank that is provided with along the radial direction of chuck of recess, guide rail 6 passes through the fastener and fixes in the constant head tank. One or a plurality of connecting holes are arranged on the upper chuck 5 and/or the lower chuck 9, and the connecting holes can be connected with external instruments.

Preferably, when the grooves are arranged on the upper side and the lower side, the guide rails (6) are arranged on the upper side and the lower side, or the guide rails (6) are arranged on one of the upper side and the lower side. Preferably, the lower chuck 8 is provided with a groove at an interval of 120 degrees with respect to the center of a circle, a positioning groove and a connecting hole are formed inside the groove, and a counter sink is formed in the center of the guide rail 6. The locating slot is used for limiting the guide rail 6, and a hole in the groove of the lower chuck 8 is connected with a hole on the guide rail 6 through a screw and a nut. The upper chuck 5 and the lower chuck 8 are provided with the same holes at intervals of 120 degrees relative to the circle center, and the holes are used as connecting holes with other mechanical structures. Preferably, the one end that the recess is close to the chuck excircle is provided with the stopper, stopper coupling spring 2, the stopper can prevent 3 roll-off recesses of sliding body with the 2 cooperation of the spring on the boss. Grease lubrication is carried out between the sliding body 3 and the guide rail 6, friction is reduced, and the service life of the device is prolonged. Preferably, chamfers are arranged on two long bottom edges of the guide rail 6, and the chamfer degree is larger than the bevel angle of the cutter for opening the positioning groove.

The axial positioning piece comprises a shaft 9, a flange 10 and a revolving body 11, the shaft 9 is connected with the revolving body 11 through the flange 10, the revolving body 11 can be in rolling connection with a sliding block structure to form a rolling pair, and the revolving body 11 is in a conical or circular truncated cone shape. The shaft 9, the flange 10 and the rotator 11 are coaxially connected in sequence. The included angle between the generatrix of the revolving body 11 and the axis is 25 degrees. Preferably, the rotator 11 is provided with a hole matched with the flange 10, and the shaft 9, the flange 10 and the cam 11 are connected by screws and nuts.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A pipe centering device is characterized by comprising a chuck, a plurality of sliding block structures and an axial positioning piece, wherein the chuck is in a ring shape, the number of the sliding block structures is more than or equal to three, the sliding block structures are uniformly distributed in the circumferential direction of the chuck, the sliding block structures can move along the radial direction of the chuck, each sliding block structure comprises a rolling end and a pipe wall acting end, the rolling end is arranged in the inner circle of the chuck ring, the pipe wall acting end is arranged outside the outer circle of the chuck ring, the axial positioning piece can move along the axial direction of the chuck in the inner circle of the chuck ring,

2. The pipe centering device according to claim 1, wherein the slider structure comprises a spring (2), a sliding body (3) and a roller (7), one end of the sliding body (3) is movably connected with the roller (7) to form a rolling end, the other end of the sliding body (3) is used as a pipe wall acting end, the sliding body (3) is connected with a chuck through the spring, and the extension direction of the spring (2) is along the radial direction of the chuck.

3. The pipe centering device according to claim 2, characterized in that the sliding body (3) is provided with a boss and a stud (1), one end of the stud (1) is connected with the boss, the other end of the stud (1) is a free end, the stud (1) is arranged along the radial direction of the chuck, the spring (2) is arranged between the boss and the chuck, and the stud (1) is arranged inside the spring (2) to guide the spring (2).

4. A tubular centering device according to claim 1, characterized in that the chuck comprises an upper chuck (5), a lower chuck (8), the upper chuck (5) being coaxially connected with the lower chuck (8);

the surface of the upper chuck (5) connected with the lower chuck (8) is uniformly provided with radial grooves in the circumferential direction, and/or the surface of the lower chuck (8) connected with the upper chuck (5) is uniformly provided with radial grooves in the circumferential direction;

the radial direction along the chuck is provided with guide rail (6) in the recess, and sliding structure is connected in guide rail (6), and sliding structure can slide along the radial direction of chuck on guide rail (6).

5. A tube centring device according to claim 2, characterised in that the slide (3) is provided with sliding grooves which can form sliding pairs with guide rails (6) provided on the chuck, the slide (3) being slidable in the radial direction of the chuck on the guide rails (6) provided on the chuck.

6. A tube centring device according to claim 4, characterised in that the recess is provided with a positioning slot in its interior in the radial direction of the chuck, in which the guide rail (6) is fixed by means of a fastening element.

7. Tube centering device according to claim 4, characterized in that the end face of the upper chuck (5) and/or the lower chuck (8) is provided with one or several connection holes, which can be connected to external instruments.

8. The pipe centering device according to claim 1, wherein the axial positioning element comprises a shaft (9), a flange (10) and a rotator (11), the shaft (9) is connected with the rotator (11) through the flange (10), the rotator (11) can be connected with a slider structure in a rolling manner to form a rolling pair, and the rotator (11) is in a conical or truncated cone shape.

9. Pipe centering device according to claim 8, characterized in that the shaft (9), the flange (10) and the body of revolution (11) are coaxially connected in sequence.

10. Tube centring device according to claim 8, characterized in that the generatrix of the body of revolution (11) is at an angle of 25 ° to the axis.