CN218895731U - Device based on concave octagon measures shale steel pipe external diameter for gas - Google Patents

Abstract

The utility model discloses a device for measuring the outer diameter of a steel pipe for shale gas based on concave octagons, and belongs to the technical field of steel pipe measurement. The device based on the outer diameter of the steel pipe for shale gas is measured to concave octagon that provides includes thirty-two screws, two first link plates, two second link plates, eight connecting rods, two measuring sticks, two first supports, two second supports, eight linear bearings, eight first hinges, sixteen second hinges, sixteen third hinges and sixteen wheels, and the device can carry out quick measurement to the outer diameter of steel pipe along the horizontal direction to have low in manufacturing cost, easy operation, measurement accuracy height's characteristics.

Description

Device based on concave octagon measures shale steel pipe external diameter for gas

Technical Field

The utility model belongs to the technical field of steel pipe measurement, and particularly relates to a device for measuring the outer diameter of a steel pipe for shale gas based on a concave octagon.

Background

At present, shale gas development has important significance for optimizing an energy structure and guaranteeing energy safety in China, but the exploitation of shale gas has high requirements on the accuracy of the external dimension of a steel pipe, and the overall performance of the steel pipe is greatly improved through a pipe making process of hot rolling perforation, continuous pipe rolling, tension reducing and water quenching tempering treatment, but the steel pipe always generates the external quality problems like bending or ellipse and the like along the axial direction, so that the geometric dimension accuracy of the steel pipe is directly influenced, and further the usability and the processability of the steel pipe are influenced, therefore, a plurality of steel pipe production enterprises have strict requirements on the external diameter of the steel pipe for shale gas, and the external diameter of the steel pipe is required to be measured one by one. For example, patent document CN204461309U (hereinafter, referred to as document 1) discloses a multifunctional detector for the inner and outer diameters of a steel pipe, which is mainly composed of a blade, an outer vernier block, an inner vernier block, a fixed measuring jaw, an outer measuring jaw, an inner measuring jaw, an outer sliding sleeve, an inner sliding sleeve and a lock bolt, and can measure the inner diameter and the outer diameter of the steel pipe, however, in the multifunctional detector for the inner and outer diameters of a steel pipe disclosed in the document 1, neither the outer vernier block nor the inner vernier block is provided with a scale, and therefore, the measurement accuracy of the device is relatively low. As another example, patent document CN207351395U (hereinafter referred to as document 2) discloses a steel pipe outer diameter detection device, which mainly comprises a hollow mounting seat, a mounting shell, a fixing plate, a belt pulley, a motor, a rotating rod, a sliding block, a T-shaped connecting block, a positioning clamp block and a laser range finder, and can detect the outer diameter of a steel pipe, however, the structure of the device of the document 2 is relatively complex, so that the manufacturing cost is relatively high, and the operation is also complicated.

Disclosure of Invention

Aiming at one or more problems in the prior art, the utility model provides a device for measuring the outer diameter of a shale gas steel pipe based on concave octagon, which comprises thirty-two screws, two first connecting plates, two second connecting plates, eight connecting rods, two measuring rods, two first brackets, two second brackets, eight linear bearings, eight first hinges, sixteen second hinges, sixteen third hinges and sixteen wheels, wherein:

the screw is formed by connecting a first body and a first boss which are coaxial, the first body and the first boss are both in cylindrical symmetrical structures, and the first boss is positioned on the right end face of the first body; the end part of the first boss is provided with threads for screwing the second screw hole of the second bracket;

the first connecting plate is formed by connecting a second body and four second bosses, the second body and the second bosses are of cuboid symmetrical structures, and the four second bosses are respectively positioned on the left end face and the right end face of the second body; a cylindrical first through hole is formed in the side face of the second boss, and the first hinge is arranged in the first through hole in a penetrating mode; two cuboid grooves are symmetrically formed in the upper end face of the second body and used for guiding rolling of the wheels;

the second connecting plate is of a cuboid symmetrical structure, four cuboid first through grooves are symmetrically formed in the left end and the right end of the second connecting plate, and the connecting rods penetrate through the first through grooves; a cylindrical third through hole is formed in two sides of the first through groove, and the second hinge is arranged in the third through hole in a penetrating mode; two cuboid second through grooves are symmetrically formed in the left end and the right end of the second connecting plate so as to facilitate installation of the second hinge;

the connecting rod is of a cuboid symmetrical structure, two ends of the connecting rod are respectively provided with a cylindrical second through hole, and the second hinge is arranged in the second through holes in a penetrating mode;

the measuring rod is formed by connecting three parts of a coaxial contact section, a thread section and a scale section, wherein the contact section is of a cylindrical symmetrical structure and is used for contacting the outer surface of a steel pipe; the thread section is of a cylindrical symmetrical structure with threads arranged on the side surface and is used for screwing the first screw hole of the second bracket, and the pitch value of the threads is 0.5mm; the scale sections are of a cylindrical symmetrical structure, four groups of scales are uniformly marked on the side surface of the cylinder along the circumferential direction, each group of scales consists of two adjacent upper and lower rows of staggered scales, the staggered value of the two rows of staggered scales is 0.5mm, and the minimum division value of the staggered scales is 1mm;

the first bracket is formed by connecting a third body, four third bosses and eight fourth bosses, wherein the third body and the fourth bosses are of cuboid symmetrical structures, the third bosses are of cylindrical symmetrical structures, the four third bosses are simultaneously positioned on the left end face of the third body, and the eight fourth bosses are divided into four groups and are simultaneously positioned on the right end face of the third body; a cuboid fifth through groove can be formed between the two fourth bosses of each group, and the connecting rod is arranged in the fifth through groove in a penetrating way; the fourth boss is provided with a cylindrical fifth through hole, and the second hinge is arranged in the fifth through hole in a penetrating manner; four cuboid third tee grooves are symmetrically formed in the upper end and the lower end of the third body, and the wheels penetrate through the third tee grooves; a cylindrical fourth through hole is formed in two sides of the third through groove, and the third hinge is arranged in the fourth through hole in a penetrating mode; two cuboid fourth grooves are symmetrically formed in the upper end and the lower end of the third body, so that the third hinge can be conveniently installed; a cylindrical sixth through hole is formed in the center of the third body, and the measuring rod is arranged in the sixth through hole in a penetrating mode;

the second bracket is formed by connecting a fifth body and a sixth boss, and the sixth boss is positioned on the left end face of the fifth body; the sixth boss is of a cylindrical symmetrical structure, and fifty division scales are uniformly marked on the side surface of the sixth boss along the circumferential direction; the axis of the sixth boss is provided with a first screw hole, and the measuring rod is screwed in the first screw hole; the first screw hole penetrates through the fifth body at the same time; the fifth body is of a cuboid symmetrical structure, four cuboid sixth through grooves are symmetrically formed in the upper end and the lower end of the fifth body, and second bosses of the first connecting plate penetrate through the sixth through grooves; a cylindrical ninth through hole is formed in two sides of the sixth through groove, and the first hinge is arranged in the ninth through hole in a penetrating mode; two cuboid seventh through grooves are symmetrically formed in the upper end and the lower end of the fifth body so as to facilitate the installation of the first hinge; the fifth body is symmetrically provided with four cylindrical tenth through holes, and the linear bearings are arranged in the tenth through holes in a penetrating manner; four second screw holes are uniformly formed in the periphery of the tenth through hole, and the screws are screwed into the second screw holes;

the linear bearing is formed by connecting a fourth body and a fifth boss, and the fifth boss is positioned on the right end face of the fourth body; the fifth boss is of a cylindrical symmetrical structure; a cylindrical eighth through hole is formed in the axis position of the fifth boss, a third boss of the first bracket is arranged in the eighth through hole in a penetrating mode, and the eighth through hole penetrates through the fourth body at the same time; a retainer, balls and check rings are further arranged in the fifth boss, a plurality of balls are uniformly arranged in the retainer, and the check rings are arranged at two ends of the retainer; the fourth body is of a cuboid symmetrical structure, four cylindrical seventh through holes are symmetrically formed in the fourth body, and the screws penetrate through the seventh through holes.

In some embodiments, the first hinge, the second hinge, the third hinge, and the wheel are all standard pieces.

In some embodiments, eight fifth bosses of the eight linear bearings are penetrated in eight tenth through holes of the two second brackets which are oppositely arranged, and are connected through thirty-two screws; eight third bosses of the two first brackets are arranged in eight eighth through holes of the eight linear bearings in a penetrating manner; one ends of eight connecting rods are arranged in the eight fifth through grooves of the two first brackets in a penetrating way and are hinged through eight second hinges; the other ends of the eight connecting rods penetrate through the eight first through grooves of the two second connecting plates and are hinged through the eight second hinges; sixteen wheels are arranged in the eight third grooves of the two first brackets in a penetrating way and are hinged through sixteen third hinges; sixteen wheels are positioned in the four grooves of the two first connecting plates; eight second bosses of the two first connecting plates are arranged in eight sixth through grooves of the two second brackets in a penetrating way and are hinged through eight first hinges; two measuring rods are screwed into the two first screw holes of the two second brackets.

The device for measuring the outer diameter of the steel pipe for shale gas based on the concave octagon comprises thirty-two screws, two first connecting plates, two second connecting plates, eight connecting rods, two measuring rods, two first supports, two second supports, eight linear bearings, eight first hinges, sixteen second hinges, sixteen third hinges and sixteen wheels, wherein scales are marked on the two measuring rods, the outer diameter of the steel pipe can be accurately measured relative to the above document 1, and in addition, the device is common in material and convenient to machine and shape, so that the manufacturing cost is relatively low relative to the manufacturing cost of the device of the above document 2.

When the device is used, the two measuring rods are rotated to the zero scale position, the original distance L between the two measuring rods is measured, the device is sleeved on a part of a steel pipe to be measured, the eight eighth through holes of the eight linear bearings are pushed inwards to approach the two first brackets, in the process, two second connecting plates which are close to each other can simultaneously contact the outer surface of the steel pipe along the vertical direction, the two measuring rods are screwed respectively, and the two second connecting plates are contacted with the outer surface of the steel pipe along the horizontal direction, and the delta 1 and the delta 2 are read and brought into formula calculation, so that the device is relatively simple in operation.

The device adopts a symmetrical structure design, and the combined use of the second bracket, the linear bearing and the screw can realize that the first bracket moves according to a preset track; the first bracket, the connecting rod and the second connecting plate are used in combination, so that the steel pipe can be clamped and centered along the vertical direction; the two scale sections of the two measuring rods and the two sixth bosses of the two second brackets are used in combination to form two spiral micrometers, so that the outer diameter of the steel pipe along the horizontal direction can be accurately measured, and the measuring accuracy of the device is relatively high.

The device for measuring the outer diameter of the steel pipe for shale gas based on the concave octagon can achieve the purpose of rapidly measuring and calculating the outer diameter of the steel pipe along the horizontal direction, and has the characteristics of low manufacturing cost, simplicity in operation and high measurement precision.

Drawings

Fig. 1 is a schematic diagram of a front view structure of a device for measuring the outer diameter of a shale gas steel pipe based on concave octagons before measurement;

fig. 2 is a schematic diagram of a left-hand structure of the device for measuring the outer diameter of the steel pipe for shale gas based on concave octagon, before measurement;

fig. 3 is a schematic diagram of a top view structure of the device for measuring the outer diameter of the steel pipe for shale gas based on concave octagon, before measurement;

fig. 4 is a schematic diagram of a front view structure of the device for measuring the outer diameter of the steel pipe for shale gas based on concave octagon in measurement;

FIG. 5 is a schematic top view of the assembled relationship of the first bracket, wheel, link and second link of the present utility model;

FIG. 6 is a schematic view of the front view of the screw of the present utility model;

FIG. 7 is a schematic front view of a first connecting plate according to the present utility model;

FIG. 8 is a schematic top view of a first link plate of the present utility model;

FIG. 9 is a schematic diagram of a front view of a connecting rod according to the present utility model;

FIG. 10 is a schematic diagram of a front view of a second link plate according to the present utility model;

FIG. 11 is a schematic top view of a second link plate according to the present utility model;

FIG. 12 is a schematic diagram showing the front view of the measuring rod of the present utility model;

figure 13 is a schematic diagram of the front view of the first bracket and wheel assembly of the present utility model;

figure 14 is a schematic view of the left side view of the first bracket and wheel assembly of the present utility model;

figure 15 is a schematic right-hand view of the first bracket and wheel assembly of the present utility model;

figure 16 is a schematic top view of the first bracket and wheel assembly of the present utility model;

FIG. 17 is a schematic diagram of the front view of a linear bearing of the present utility model;

FIG. 18 is a right side view of a linear bearing of the present utility model;

FIG. 19 is a schematic front view of a second bracket according to the present utility model;

FIG. 20 is a schematic left-hand structural view of a second bracket of the present utility model;

FIG. 21 is a schematic structural view of a concave octagonal frame of the device for measuring the outer diameter of a steel pipe for shale gas based on the concave octagon;

fig. 22 is a schematic diagram of the working principle of the device for measuring the outer diameter of the steel pipe for shale gas based on the concave octagon.

Reference numerals illustrate: 1-a screw; 101-a first body; 102-a first boss; 2-a first connecting plate; 201-a second body; 202-a second boss; 203-a first via; 204-grooves; 3-connecting rod; 301-a second through hole; 4-a second connecting plate; 401-a third via; 402-a first through slot; 403-a second through slot; 5-measuring rod; 501-a contact section; 502-thread segments; 503-scale segment; 6-a first bracket; 601-a third body; 602-a third boss; 603-fourth boss; 604-fourth vias; 605-fifth through holes; 606-sixth through hole; 607-third through slots; 608-fourth pass through slot; 609-fifth pass groove; 7-a linear bearing; 701-a fourth body; 702-fifth boss; 703-seventh through holes; 704-eighth through holes; 8-a second bracket; 801-a fifth body; 802-sixth boss; 803-ninth through holes; 804-a sixth through slot; 805-seventh through slot; 806-a first screw hole; 807-tenth via holes; 808-a second screw hole; a9-a first hinge; b9-a second hinge; c9-a third hinge; 10-wheels; 11-steel pipe.

Detailed Description

The following describes the utility model in detail by way of examples and figures, which are provided solely for the understanding of the utility model and are not intended to limit the utility model.

Example 1: device based on concave octagon measures shale steel pipe external diameter for gas

Referring to fig. 1 to 5, the utility model provides a device for measuring the outer diameter of a steel pipe for shale gas based on a concave octagon, which comprises thirty-two screws 1, two first connecting plates 2, two second connecting plates 4, eight connecting rods 3, two measuring rods 5, two first brackets 6, two second brackets 8, eight linear bearings 7, eight first hinges a9, sixteen second hinges b9, sixteen third hinges c9 and sixteen wheels 10; wherein, eight fifth bosses 702 of eight linear bearings 7 are penetrated in eight tenth through holes 807 of two second brackets 8 which are oppositely arranged, and are connected by thirty-two screws 1; eight third bosses 602 of the two first brackets 6 are arranged in eight eighth through holes 704 of the eight linear bearings 7 in a penetrating manner; one end of each of the eight connecting rods 3 is penetrated in the eight fifth through grooves 609 of the two first brackets 6 and hinged through eight second hinges b9; the other ends of the eight connecting rods 3 are arranged in the eight first through grooves 402 of the two second connecting plates 4 in a penetrating way and are hinged through eight second hinges b9; sixteen wheels 10 are arranged in the eight third through grooves 607 of the two first brackets 6 in a penetrating way and are hinged through sixteen third hinges c9; sixteen of the wheels 10 are located within four grooves 204 of two of the first connecting plates 2; eight second bosses 202 of the two first connecting plates 2 are arranged in eight sixth through grooves 804 of the two second brackets 8 in a penetrating manner and are hinged through eight first hinges a9; two measuring rods 5 are screwed into two first screw holes 806 of two second brackets 8.

Referring to fig. 6, the screw 1 is formed by coaxially connecting a first body 101 and a first boss 102, where the first body 101 and the first boss 102 are both in a cylindrical symmetrical structure, and the first boss 102 is located on the right end face of the first body 101; the end of the first boss 102 is provided with threads for screwing into the second screw hole 808 of the second bracket 8.

Referring to fig. 7 and 8, the first connecting plate 2 is formed by connecting a second body 201 and four second bosses 202, wherein the second body 201 and the second bosses 202 are both rectangular symmetrical structures, and the four second bosses 202 are respectively located at left and right end surfaces of the second body 201; a cylindrical first through hole 203 is formed on the side surface of the second boss 202, and the first hinge a9 is penetrated in the first through hole 203; two cuboid grooves 204 are symmetrically formed on the upper end surface of the second body 201, and are used for guiding the rolling of the wheel 10.

Referring to fig. 10 and 11, the second connecting plate 4 has a symmetrical rectangular structure, four rectangular first through slots 402 are symmetrically formed at the left and right ends of the second connecting plate 4, and the connecting rod 3 is inserted into the first through slots 402; a third cylindrical through hole 401 is formed on both sides of the first through groove 402, and the second hinge b9 is arranged in the third through hole 401 in a penetrating manner; two cuboid second through grooves 403 are symmetrically formed in the left and right ends of the second connecting plate 4, so that the second hinge b9 can be conveniently installed.

Referring to fig. 9, the connecting rod 3 has a rectangular symmetrical structure, two ends of the connecting rod 3 are respectively provided with a cylindrical second through hole 301, and the second hinge b9 is inserted into the second through hole 301.

Referring to fig. 12, the measuring rod 5 is formed by connecting three parts of a coaxial contact section 501, a thread section 502 and a scale section 503, wherein the contact section 501 is of a cylindrical symmetrical structure and is used for contacting the outer surface of a steel pipe; the thread section 502 is a cylindrical symmetrical structure with threads on the side surface, and is used for screwing the first screw hole 806 of the second bracket 8, and the pitch value of the threads is 0.5mm; the scale section 503 is a symmetrical structure of a cylinder shape, four groups of scales are uniformly marked on the side surface of the cylinder along the circumferential direction, each group of scales is composed of two adjacent upper and lower rows of staggered scales, the dislocation value of the two rows of staggered scales is 0.5mm, and the minimum division value of the staggered scales is 1mm.

Referring to fig. 13 to 16, the first bracket 6 is formed by connecting a third body 601, four third bosses 602 and eight fourth bosses 603, wherein the third body 601 and the fourth bosses 603 are both in a rectangular symmetrical structure, the third bosses 602 are in a cylindrical symmetrical structure, the four third bosses 602 are simultaneously located at the left end face of the third body 601, and the eight fourth bosses 603 are divided into four groups and are simultaneously located at the right end face of the third body 601; a fifth rectangular through slot 609 may be formed between the two fourth bosses 603 of each group, and the connecting rod 3 is disposed in the fifth through slot 609 in a penetrating manner; the fourth boss 603 is provided with a cylindrical fifth through hole 605, and the second hinge b9 is arranged in the fifth through hole 605 in a penetrating manner; four cuboid third grooves 607 are symmetrically formed at the upper and lower ends of the third body 601, and the wheels 10 are arranged in the third grooves 607 in a penetrating manner; a cylindrical fourth through hole 604 is formed on both sides of the third through hole 607, and the third hinge c9 is inserted into the fourth through hole 604; two rectangular fourth grooves 608 are symmetrically formed at the upper and lower ends of the third body 601, so as to facilitate the installation of the third hinge c9; a cylindrical sixth through hole 606 is formed in the center of the third body 601, and the measuring rod 5 is inserted into the sixth through hole 606.

As shown in fig. 19 and 20, the second bracket 8 is formed by connecting a fifth body 801 and a sixth boss 802, and the sixth boss 802 is located on the left end face of the fifth body 801; the sixth boss 802 is a cylindrical symmetrical structure, and fifty division scales are uniformly marked on the side surface of the sixth boss 802 along the circumferential direction; a first screw hole 806 is formed in the axial position of the sixth boss 802, and the measuring rod 5 is screwed into the first screw hole 806; the first screw hole 806 also penetrates through the fifth body 801; the fifth body 801 is a symmetrical cuboid structure, four cuboid sixth through grooves 804 are symmetrically formed at the upper end and the lower end of the fifth body 801, and the second boss 202 of the first connecting plate 2 is arranged in the sixth through grooves 804 in a penetrating manner; a cylindrical ninth through hole 803 is formed on both sides of the sixth through groove 804, and the first hinge a9 is disposed in the ninth through hole 803 in a penetrating manner; two cuboid seventh through grooves 805 are symmetrically formed at the upper end and the lower end of the fifth body 801, so as to facilitate installation of the first hinge a9; the fifth body 801 is symmetrically provided with four cylindrical tenth through holes 807, and the linear bearing 7 is arranged in the tenth through holes 807 in a penetrating manner; four second screw holes 808 are uniformly formed around the tenth through hole 807, and the screw 1 is screwed into the second screw holes 808.

As shown in fig. 17 and 18, the linear bearing 7 is formed by connecting a fourth body 701 and a fifth boss 702, and the fifth boss 702 is located on the right end face of the fourth body 701; the fifth boss 702 is a cylindrical symmetrical structure; an eighth cylindrical through hole 704 is formed at the axial position of the fifth boss 702, the third boss 602 of the first bracket 6 is disposed in the eighth through hole 704 in a penetrating manner, and the eighth through hole 704 also penetrates through the fourth body 701; a retainer, balls and check rings are further arranged in the fifth boss 702, a plurality of balls are uniformly arranged in the retainer, and the check rings are arranged at two ends of the retainer; the fourth body 701 is a symmetrical structure with a rectangular parallelepiped shape, four cylindrical seventh through holes 703 are symmetrically formed in the fourth body 701, and the screw 1 is inserted into the seventh through holes 703.

Example 2: the utility model provides an assembly process of a device for measuring the outer diameter of a shale gas steel pipe based on concave octagons

As shown in fig. 1 to 20, first, two wheels 10 are respectively inserted into eight third through grooves 607 of two first brackets 6, the axle center holes of sixteen wheels 10 are centered with sixteen fourth through holes 604 of two first brackets 6, and then one third hinge c9 is respectively installed in sixteen centered through holes, so that two first brackets 6 and sixteen wheels 10 can be assembled into two first bracket vehicles;

then, the eight fifth bosses 702 of the eight linear bearings 7 are inserted into the eight tenth through holes 807 of the two second brackets 8, the thirty-two seventh through holes 703 of the eight linear bearings 7 and the thirty-two second screw holes 808 of the two second brackets 8 are centered, and the thirty-two screws 1 are inserted into the thirty-two seventh through holes 703 and screwed into the thirty-two second screw holes 808, so that the eight linear bearings 7 and the two second brackets 8 can be assembled by the thirty-two screws 1;

then, the two second brackets 8 are simultaneously arranged on the mounting table, then, the eight third bosses 602 of the two first brackets 6 are respectively penetrated into the eight eighth through holes 704 of the eight linear bearings 7, then, one ends of the eight connecting rods 3 are respectively penetrated into the eight fifth through grooves 609 of the two first brackets 6, the eight second through holes 301 of the eight connecting rods 3 are centered with the sixteen fifth through holes 605 of the two first brackets 6, and then, one second hinge b9 is respectively arranged in the eight centered through holes, so that the two second brackets 8, the two first brackets 6 and the eight connecting rods 3 can be assembled;

then, the other ends of the eight connecting rods 3 are respectively penetrated into the eight first through grooves 402 of the two second connecting plates 4, then, the other eight second through holes 301 of the eight connecting rods 3 are centered with the sixteen third through holes 401 of the two second connecting plates 4, and then, one second hinge b9 is respectively arranged in the eight centered through holes, so that the eight connecting rods 3 and the two second connecting plates 4 can be assembled;

then, the eight second bosses 202 at the two ends of the two first connecting plates 2 are respectively inserted into the eight sixth through grooves 804 of the two second brackets 8, sixteen wheels 10 are simultaneously arranged in the four grooves 204 of the two first connecting plates 2, then, the eight first through holes 203 of the two first connecting plates 2 and sixteen ninth through holes 803 of the two second brackets 8 are centered, and then, one first hinge a9 is respectively arranged in the eight centered through holes, so that the two first connecting plates 2 and the two second brackets 8 can be assembled;

finally, the two thread segments 502 of the two measuring rods 5 are screwed into the two first screw holes 806 of the two second brackets 8, respectively, so that the whole device is assembled and can be put into use.

Example 3: the utility model provides a working principle of a device for measuring the outer diameter of a shale gas steel pipe based on concave octagons

Referring to fig. 21, two first brackets 6, eight connecting rods 3, two second connecting plates 4 and sixteen second hinges B9 may form a concave octagonal frame ABCDEFGH, and points a, B, C, D, E, F, G and H are axes of the eight second hinges B9, respectively, and MN is an axis of the two measuring rods 5; because the device adopts a symmetrical structure design, the concave octagonal frame ABCDEFGH can be ensured to be of a symmetrical structure, namely, regardless of deformation of the concave octagonal frame ABCDEFGH, MN is always the symmetrical axis of the concave octagonal frame ABCDEFGH, namely, the axes MN of the two measuring rods 5 always pass through the diameter of the steel pipe 11;

as shown in fig. 22, when measuring the outer diameter of the steel pipe 11, the two measuring rods 5 arranged in the horizontal direction are screwed in respectively, so that the two contact sections 501 are ensured to be in tangential relation with the outer surface of the steel pipe 11; the original distance between the two contact sections 501 of the two measuring rods 5 positioned at the zero scale position is set as L, the outer diameter of the steel pipe 11 along the horizontal direction is set as D, the measuring rod 5 positioned at the left side is set as (1), the measuring rod 5 positioned at the right side is set as (2), the axial distances of the precession of the (1) and the (2) are sequentially set as delta 1 and delta 2, and the equation L= delta 1+D+ [ delta 2 ] is obtained according to the knowledge point that the distances between parallel lines are equal everywhere, and the equation D= L-delta 1-delta 2 is obtained after finishing;

with reference to fig. 1 and 22, the combined use of the two scale segments 503 of the two measuring rods 5 and the two sixth bosses 802 of the two second brackets 8 can form two spiral micrometers, and the measurement precision of the two spiral micrometers can reach 0.01mm, and the reasoning process is as follows: since the pitch value of the screw thread of the measuring rod 5 is 0.5mm, that is, the axial distance of the measuring rod 5 moving within the first screw hole 806 is 0.5mm for each rotation of the measuring rod 5, and fifty division scales are uniformly marked on the side surface of the sixth boss 802 along the circumferential direction, the axial distance of the measuring rod 5 moving within the first screw hole 806 is 0.01mm for each rotation of the measuring rod 5.

Example 4: the utility model provides a use process of a device for measuring the outer diameter of a shale gas steel pipe based on concave octagons

Firstly, the two measuring rods 5 are rotated to the zero scale position, then the original distance L between the two measuring rods 5 is measured, then the utility model is sleeved on the part of the steel tube 11 to be measured, then the two first brackets 6 are pushed inwards along eight eighth through holes 704 of eight linear bearings 7, in the process, two second connecting plates 4 which are mutually close can simultaneously contact the outer surfaces of the steel tube 11 along the vertical direction, then the two measuring rods 5 are screwed in respectively, the two contact sections 501 of the two measuring rods 5 are contacted with the outer surfaces of the steel tube 11 along the horizontal direction, then delta 1 and delta 2 are read, and the corresponding outer diameter D of the steel tube 11 along the horizontal direction can be calculated through the formula D=L-delta 1-delta 2.

Supplementary explanation: the device for measuring the outer diameter of the steel pipe for shale gas based on the concave octagon is designed by adopting a symmetrical structure, and initial graduation lines of two measuring rods 5 and two sixth bosses 802 of two second brackets 8 are all kept in an aligned relationship so as to ensure the effectiveness of measurement; because the contact section 501 of the measuring rod 5 adopts a cylindrical structure, even if a certain eccentric problem exists in the placement position of the steel pipe 11, the contact section 501 can be ensured to always keep a tangential relationship with the steel pipe 11.

According to the embodiment, the device for measuring the outer diameter of the steel pipe for shale gas based on the concave octagon can achieve the purpose of rapidly measuring and calculating the outer diameter of the steel pipe along the horizontal direction, and has the characteristics of low manufacturing cost, simplicity in operation and high measurement precision.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for part of the technical features thereof.

Claims (3)

1. Device based on concave octagon measures shale steel pipe external diameter for gas, its characterized in that, device based on concave octagon measures shale steel pipe external diameter for gas includes: thirty-two screws (1), two first link plates (2), two second link plates (4), eight link rods (3), two measuring rods (5), two first supports (6), two second supports (8), eight linear bearings (7), eight first hinges (a 9), sixteen second hinges (b 9), sixteen third hinges (c 9) and sixteen wheels (10), wherein:

the screw (1) is formed by connecting a first body (101) and a first boss (102) which are coaxial, the first body (101) and the first boss (102) are of cylindrical symmetrical structures, and the first boss (102) is positioned on the right end face of the first body (101); the end part of the first boss (102) is provided with threads for screwing in a second screw hole (808) of the second bracket (8);

the first connecting plate (2) is formed by connecting a second body (201) and four second bosses (202), the second body (201) and the second bosses (202) are of cuboid symmetrical structures, and the four second bosses (202) are respectively positioned on the left end face and the right end face of the second body (201); a cylindrical first through hole (203) is formed in the side surface of the second boss (202), and the first hinge (a 9) is arranged in the first through hole (203) in a penetrating manner; two cuboid grooves (204) are symmetrically formed in the upper end face of the second body (201) and used for guiding rolling of the wheel (10);

the second connecting plate (4) is of a cuboid symmetrical structure, four cuboid first through grooves (402) are symmetrically formed in the left end and the right end of the second connecting plate (4), and the connecting rod (3) is arranged in the first through grooves (402) in a penetrating mode; both sides of the first through groove (402) are provided with a cylindrical third through hole (401), and the second hinge (b 9) is arranged in the third through hole (401) in a penetrating way; two cuboid second through grooves (403) are symmetrically formed in the left end and the right end of the second connecting plate (4) so as to facilitate the installation of the second hinge (b 9);

the connecting rod (3) is of a cuboid symmetrical structure, two ends of the connecting rod (3) are respectively provided with a cylindrical second through hole (301), and the second hinge (b 9) is arranged in the second through hole (301) in a penetrating mode;

the measuring rod (5) is formed by connecting three parts of a coaxial contact section (501), a thread section (502) and a scale section (503), wherein the contact section (501) is of a cylindrical symmetrical structure and is used for contacting the outer surface of a steel pipe; the thread section (502) is of a cylindrical symmetrical structure with threads on the side surface, and is used for screwing the first screw hole (806) of the second bracket (8), and the pitch value of the threads is 0.5mm; the scale sections (503) are of a cylindrical symmetrical structure, four groups of scales are uniformly marked on the side surface of the cylinder along the circumferential direction, each group of scales consists of two adjacent upper and lower rows of staggered scales, the dislocation value of the two rows of staggered scales is 0.5mm, and the minimum division value of the staggered scales is 1mm;

the first bracket (6) is formed by connecting a third body (601), four third bosses (602) and eight fourth bosses (603), wherein the third body (601) and the fourth bosses (603) are both in cuboid symmetrical structures, the third bosses (602) are in cylindrical symmetrical structures, the four third bosses (602) are simultaneously positioned on the left end face of the third body (601), and the eight fourth bosses (603) are divided into four groups and are simultaneously positioned on the right end face of the third body (601); a cuboid fifth through groove (609) can be formed between the two fourth bosses (603) of each group, and the connecting rod (3) is arranged in the fifth through groove (609) in a penetrating manner; the fourth boss (603) is provided with a cylindrical fifth through hole (605), and the second hinge (b 9) is arranged in the fifth through hole (605) in a penetrating manner; four cuboid third through grooves (607) are symmetrically formed in the upper end and the lower end of the third body (601), and the wheels (10) are arranged in the third through grooves (607) in a penetrating mode; a cylindrical fourth through hole (604) is formed in two sides of the third through groove (607), and the third hinge (c 9) is arranged in the fourth through hole (604) in a penetrating manner; two cuboid fourth grooves (608) are symmetrically formed in the upper end and the lower end of the third body (601) so as to facilitate the installation of the third hinge (c 9); a cylindrical sixth through hole (606) is formed in the center of the third body (601), and the measuring rod (5) is arranged in the sixth through hole (606) in a penetrating manner;

the second bracket (8) is formed by connecting a fifth body (801) and a sixth boss (802), and the sixth boss (802) is positioned on the left end face of the fifth body (801); the sixth boss (802) is of a cylindrical symmetrical structure, and fifty division scales are uniformly marked on the side surface of the sixth boss (802) along the circumferential direction; a first screw hole (806) is formed in the axis position of the sixth boss (802), and the measuring rod (5) is screwed in the first screw hole (806); the first screw hole (806) also penetrates through the fifth body (801); the fifth body (801) is of a cuboid symmetrical structure, four cuboid sixth through grooves (804) are symmetrically formed in the upper end and the lower end of the fifth body (801), and second bosses (202) of the first connecting plate (2) are arranged in the sixth through grooves (804) in a penetrating mode; a cylindrical ninth through hole (803) is formed in two sides of the sixth through groove (804), and the first hinge (a 9) is arranged in the ninth through hole (803) in a penetrating manner; two cuboid seventh through grooves (805) are symmetrically formed in the upper end and the lower end of the fifth body (801) so as to facilitate the installation of the first hinge (a 9); the fifth body (801) is symmetrically provided with four cylindrical tenth through holes (807), and the linear bearing (7) is arranged in the tenth through holes (807) in a penetrating manner; four second screw holes (808) are uniformly formed in the periphery of the tenth through hole (807), and the screws (1) are screwed in the second screw holes (808);

the linear bearing (7) is formed by connecting a fourth body (701) and a fifth boss (702), and the fifth boss (702) is positioned on the right end face of the fourth body (701); the fifth boss (702) is of a cylindrical symmetrical structure; an eighth cylindrical through hole (704) is formed in the axial position of the fifth boss (702), a third boss (602) of the first bracket (6) is arranged in the eighth through hole (704) in a penetrating manner, and the eighth through hole (704) penetrates through the fourth body (701) at the same time; a retainer, balls and check rings are further arranged in the fifth boss (702), a plurality of balls are uniformly arranged in the retainer, and the check rings are arranged at two ends of the retainer; the fourth body (701) is of a cuboid symmetrical structure, four cylindrical seventh through holes (703) are symmetrically formed in the fourth body (701), and the screw (1) is arranged in the seventh through holes (703) in a penetrating mode.

2. The device for measuring the outer diameter of a steel pipe for shale gas based on concave octagon according to claim 1, wherein the first hinge (a 9), the second hinge (b 9), the third hinge (c 9) and the wheel (10) are all standard components.

3. The device for measuring the outer diameter of the steel pipe for shale gas based on the concave octagon according to claim 1 or 2, characterized in that eight fifth bosses (702) of eight linear bearings (7) are penetrated in eight tenth through holes (807) of two second brackets (8) which are oppositely arranged and are connected through thirty-two screws (1); eight third bosses (602) of the two first brackets (6) are arranged in eight eighth through holes (704) of the eight linear bearings (7) in a penetrating manner; one end of eight connecting rods (3) is arranged in eight fifth through grooves (609) of the two first brackets (6) in a penetrating way and hinged through eight second hinges (b 9); the other ends of the eight connecting rods (3) are arranged in the eight first through grooves (402) of the two second connecting plates (4) in a penetrating way and are hinged through eight second hinges (b 9); sixteen wheels (10) are arranged in the eight third through grooves (607) of the two first brackets (6) in a penetrating way and are hinged through sixteen third hinges (c 9); sixteen wheels (10) are positioned in four grooves (204) of two first connecting plates (2); eight second bosses (202) of the two first connecting plates (2) are arranged in eight sixth through grooves (804) of the two second brackets (8) in a penetrating way and are hinged through eight first hinges (a 9); two measuring rods (5) are screwed into two first screw holes (806) of the two second brackets (8).

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