Axial compression centering device for pipe parts

Abstract

The utility model discloses an axial compression centering device for pipe parts. The axial compression centering device comprises an upper compression platform, a lower compression platform, a guide mechanism and a positioning mechanism, the guide mechanism comprises a guide block, an outer ring, a guide column and a spring; the positioning mechanism comprises a positioning ring and a connecting rod; the upper compression platform is located over the lower compression platform. The center position of the top of the upper compression platform is connected with an upper chuck of a testing machine; the center position of the bottom of the lower compression platform is connected with a lower chuck of the testing machine; a plurality of guide blocks are placed at the top of the lower compression platform; the inner side surfaces of the plurality of guide blocks are encircled to form an accommodating cavity for placing a test piece; a guide column is arranged on the outer side surface of each guide block; each guide column is sleeved with a spring; the bottom of the outer ring is connected with the circumferential outer wall of the positioning ring through a connecting rod; the positioning ring is connected with the lower end of the tester lower chuck. When a compression test is carried out on pipe parts, the pipe fitting centering device can conveniently and reliably carry out centering operation on pipe fittings, the pipe fittings are prevented from deviating and overturning, and the centering precision of the pipe fittings is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of static testing, in particular to an axial compression centering device for pipe parts, in particular to a pipe part compression centering device designed for compression testing of pipe parts. Background Art

[0002] With the continuous development of modern industry, the application of pipe parts is becoming more and more extensive in various fields. From petrochemicals and aerospace to construction engineering, pipe parts (also known as pipe fittings) play an important role. However, in actual use, pipe parts are often subjected to various external forces, and compression is a common force.

[0003] In order to ensure that pipe parts can work normally under compression load and ensure the safety and reliability of the project, it is particularly important to conduct compression tests on pipe parts.

[0004] Currently, there are numerous types of pipe components on the market, made of varying materials and exhibiting significant differences in performance. Furthermore, with the continuous advancement of technology, performance requirements for pipe components are also increasing. New materials and manufacturing processes are constantly emerging, and compression testing is required to verify their feasibility and reliability. Compression testing can also provide data support for the design and optimization of pipe components, promoting technological innovation and development in the pipe component industry.

[0005] When performing compression tests on pipe parts, it is required to adopt the compression centering method of the pipe parts.

[0006] It should be noted that centering requires the center axis of the testing machine (e.g., compressor) chuck to be aligned with the center axis of the tubular component. This prevents uneven stress on the test piece (e.g., tubular component) during compression. Compression centering is used on tubular components to ensure uniform stress on the test piece (e.g., tubular component), avoiding excessive or insufficient local stress, thereby ensuring roughly equal stress across the cross section. Misalignment during testing can lead to uneven stress, causing unstable failure, impacting the accuracy of test data, and compromising the observation of cross-sectional shape.

[0007] However, the traditional compression centering method for pipe parts is to adjust by manual observation combined with calipers and micrometers, which has obvious disadvantages, as follows:

[0008] First, the accuracy of manual observation and adjustment is limited, and it is difficult to ensure completely accurate centering.

[0009] Second, the centering process is rather complicated and time-consuming, which affects the test efficiency.

[0010] Third, the experience and skill levels of different operators will also affect the results of the heart.

[0011] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Utility Model Content

[0012] The purpose of the utility model is to provide an axial compression centering device for pipe parts in view of the technical defects in the prior art.

[0013] To this end, the utility model provides an axial compression centering device for pipe parts, which includes an upper compression platform and a lower compression platform, as well as a guide mechanism and a positioning mechanism;

[0014] The guide mechanism includes a guide block, an outer ring, a guide post and a spring;

[0015] A positioning mechanism, comprising a positioning ring and a connecting rod;

[0016] Among them, the upper compression platform is located directly above the lower compression platform;

[0017] The top center position of the upper compression platform is connected to the upper clamp of the testing machine of the external testing machine;

[0018] The bottom center position of the lower compression platform is connected to the lower clamp of the external testing machine;

[0019] Among them, a plurality of guide blocks are placed on the top of the lower compression platform;

[0020] A plurality of guide blocks are placed circumferentially on the inner side of an outer ring;

[0021] An accommodating cavity for placing the lower end of the test piece is formed between the inner side surfaces of the plurality of guide blocks;

[0022] The outer side surface of each guide block is provided with a radially distributed guide post;

[0023] Each guide pin sleeve has a coil spring;

[0024] The outer end of the guide post passes through the guide post through hole reserved on the outer ring;

[0025] The outer end of the spring is in tight contact with the inner wall of the outer ring;

[0026] Wherein, the two circumferential sides of the bottom of the outer ring are connected to the circumferential outer wall of a positioning ring through a connecting rod respectively;

[0027] The positioning ring is fixedly connected to the lower end of the lower clamp of the testing machine.

[0028] It can be seen from the technical solution provided by the above-mentioned utility model that, compared with the prior art, the utility model provides an axial compression centering device for pipe parts, which is scientifically designed. The utility model is applied in the process of compression testing of pipe parts (i.e., pipe fittings). The utility model can conveniently and reliably perform centering (i.e., centering) operations on pipe parts, prevent the pipe fittings from being offset and flipped, and ensure the centering accuracy of the pipe fittings, which is conducive to improving the overall efficiency of the compression test and reducing the test error, and has great practical significance.

[0029] In addition, the device of the present invention is an axial compression centering device for pipe parts based on a universal testing machine. It adopts a wedge block (i.e., a guide block) in combination with a spring and a guide column. When a force load is applied, the pipe is guided by the wedge block (i.e., a guide block). At the same time, the wedge block is always pressed against the pipe by the spring, thereby preventing the pipe from shifting and flipping, effectively ensuring the centering accuracy of the pipe, improving the work efficiency of the test, and reducing the test error.

[0030] In addition, the centering method adopted by the present invention is a more accurate method for centering the axis of the pipe compression test, which is beneficial to improving the accuracy of the pipe compression test data and preventing the situation where the test accuracy is affected by large manual centering errors.

[0031] This utility model is designed for compression testing of tubular components. During compression testing, it is difficult for the central axis of the tubular component to accurately align with the central axis of the testing machine (e.g., a compressor). Therefore, a compression centering device has been designed specifically for these components. The central axis of the device in this utility model aligns with the central axis of the testing machine (e.g., a compressor). Under pressure, the wedge-shaped block (i.e., a guide block) guides the central axis of the tubular component and the device, thus resolving the difficulty of centering tubular components during compression testing. Verification has shown that this solution is reliably applicable to tubular components with diameters ranging from 3 to 80 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the working state of an embodiment of an axial compression centering device for pipe parts provided by the utility model Figure 1 (It is a schematic diagram of the front side);

[0033] Figure 2 A schematic diagram of the working state of an embodiment of an axial compression centering device for pipe parts provided by the utility model Figure 2 (It is a schematic diagram from the side);

[0034] Figure 3 Schematic diagram of the principle of an axial compression centering device for pipe parts provided by the utility model Figure 1 ;

[0035] Figure 4The axial compression centering device for pipe parts provided by the utility model provides a principle diagram of the axial compression centering device for pipe parts Figure 2

[0036] Figure 5 The axial compression centering device for pipe parts provided by the utility model provides a principle diagram of the axial compression centering device for pipe parts

[0037] Figure 6 The axial compression centering device for pipe parts provided by the utility model provides a principle diagram of the axial compression centering device for pipe parts

[0038] Figure 7 The axial compression centering device for pipe parts provided by the utility model provides a principle diagram of the axial compression centering device for pipe parts

[0039] In the figure, 1 is an upper clamp of a testing machine, 2 is an upper compression platform, 3 is a spring, 4 is a guide column, 5 is a lower clamp block;

[0040] 6 is a positioning ring, 7 is a lower clamp of a testing machine, 8 is a lower compression platform, 9 is a connecting rod, and 10 is an outer ring;

[0041] 11 is a guide block, 12 is a testing piece, and 13 is an upper clamp block. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0043] In the description of the utility model, it should be understood that the directions or position relations indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are the directions or position relations shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular direction, be constructed and operated in a particular direction, and therefore cannot be understood as a limitation on the utility model.

[0044] ​In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0046] See also Figures 1 to 7 The utility model provides an axial compression and centering device for pipe parts, which is an axial compression and centering device for pipe parts based on a universal testing machine. The device includes: an upper compression platform 2 and a lower compression platform 8, as well as a guide mechanism and a positioning mechanism;

[0047] The guide mechanism includes a guide block 11, an outer ring 10, a guide post 4 and a spring 3;

[0048] Positioning mechanism, including a positioning ring 6 and a connecting rod 9;

[0049] Among them, the upper compression platform 2 is located directly above the lower compression platform 8;

[0050] The top center position of the upper compression platform 2 is connected to the upper chuck 1 of the external testing machine;

[0051] The bottom center position of the lower compression platform 8 is connected to the testing machine lower clamp 7 of the external testing machine;

[0052] Among them, a plurality of guide blocks 11 are placed on the top of the lower compression platform 8;

[0053] A plurality of guide blocks 11 are placed circumferentially on the inner side of an outer ring 10;

[0054] An accommodating cavity for placing the lower end of a test piece 12 (i.e., a pipe to be subjected to a compression test) is formed between the inner side surfaces of the plurality of guide blocks 11 (i.e., the side close to the central axis of the lower compression platform 8);

[0055] The outer side surface of each guide block 11 (i.e. the side away from the central axis of the lower compression platform 8) is provided with a radially distributed guide post 4;

[0056] Each guide post 4 is covered with a spiral spring 3;

[0057] The outer end of the guide post 4 passes through the guide post through hole reserved on the outer ring 10;

[0058] The outer end of the spring 3 (i.e., the end away from the central axis of the lower compression platform 8) is in tight contact with the inner wall of the outer ring 10;

[0059] The bottom circumferential sides of the outer ring 10 are connected to the circumferential outer wall of a positioning ring 6 through a connecting rod 9 respectively;

[0060] The positioning ring 6 is fixedly connected to the lower end of the lower clamp 7 of the testing machine.

[0061] It should be noted that, in the present invention, the positioning ring 6 and the connecting rod 9 together constitute a positioning mechanism; the guide block 11 , the outer ring 10 , the guide post 4 and the spring 3 together constitute a guiding mechanism.

[0062] In the present invention, in a specific implementation, the cross-sectional shape of the upper compression platform 2 and the lower compression platform 8 is circular;

[0063] The overall shape of the outer ring 10 is annular.

[0064] In the present invention, in specific implementation, the two connecting rods 9 are axially symmetrically distributed.

[0065] In the present invention, the connecting rod 9 includes a first vertical section 901, a second vertical section 902, a first horizontal section 903 and a second horizontal section 904;

[0066] The upper end of the vertically distributed first vertical segment 901 is connected to the bottom of the outer ring 10;

[0067] The lower end of the first vertical section 901 is connected to the inner end of the horizontally distributed first horizontal section 903 (i.e., the end close to the central axis of the lower compression platform 8);

[0068] The outer end of the first horizontal section 903 (i.e., the end away from the central axis of the lower compression platform 8) is connected to the upper end of the second vertical section 902;

[0069] The lower end of the second vertical section 902 is connected to the outer end of the horizontally distributed second horizontal section 904 (i.e., the end away from the central axis of the lower compression platform 8);

[0070] An inner end of the second horizontal section 904 (ie, the end close to the central axis of the lower compression platform 8 ) is connected to the circumferential outer wall of the positioning ring 6 .

[0071] In a specific implementation, the central axes of the first vertical segment 901 , the second vertical segment 902 , the first horizontal segment 903 , and the second horizontal segment 904 are located on the same vertical plane;

[0072] In a specific implementation, the first horizontal segment 903 and the second horizontal segment 904 are distributed along the radial direction of the outer ring 10 .

[0073] In a specific implementation, the first vertical segment 901 , the second vertical segment 902 , the first horizontal segment 903 and the second horizontal segment 904 are integrally formed, and can be obtained by bending a straight metal rod multiple times.

[0074] In the present utility model, in a specific implementation, the positioning ring 6 includes two semicircular rings;

[0075] Each semicircular ring is fixedly connected to the lower end of the lower clamp 7 of the testing machine through a fastening bolt. Specifically, the lower end of the lower clamp 7 of the testing machine has a threaded hole for threaded connection with the fastening bolt, and the semicircular ring has a bolt through hole. The fastening bolt passes through the bolt through hole and is threadedly connected to the threaded hole.

[0076] In the present invention, a plurality of guide blocks 11 are placed around the top of the lower compression platform 8 .

[0077] In the present invention, a plurality of guide blocks 11 surround and form an integral guide structure;

[0078] When the test piece 12 is not placed inside the integral guide structure (ie, the inclined surface of the guide block does not contact the test piece), the plurality of guide blocks 11 are connected in sequence, and the cross-sectional shape of the integral guide structure is annular.

[0079] In the present invention, four guide blocks 11 are placed around the top of the lower compression platform 8;

[0080] In a specific implementation, the top and bottom surfaces of the guide block 11 are smooth planes;

[0081] The outer side surface of the guide block 11 (i.e. the side away from the central axis of the lower compression platform 8) is a vertical plane;

[0082] The inner side surface of the guide block 11 (ie the side close to the central axis of the lower compression platform 8 ) is an inclined surface, and the height of the inclined surface increases as the distance from the central axis of the lower compression platform 8 increases.

[0083] In a specific implementation, the cross-sectional shape of the guide block 11 is a fan ring shape;

[0084] In a specific implementation, the radial cross-section of the guide block 11 is a right-angled trapezoid.

[0085] In a specific implementation, the four guide blocks 11 have exactly the same shape and structure, and are all wedge-shaped blocks.

[0086] In the present invention, the guide block 11 is a wedge-shaped structure, and its material is 45 steel.

[0087] In the present invention, radially distributed bosses are provided on the circumferential outer side surface of the guide block 11;

[0088] The boss is provided with radially distributed threaded holes;

[0089] The threaded hole on the boss is threadedly connected to the inner end of the guide post 4;

[0090] The outer sides of the guide pillar 4 and the boss are covered with a spring 3.

[0091] It should be noted that the guide post 4 and the spring 3 can limit the movement direction of the guide block 11 and improve the centering accuracy.

[0092] It should be noted that, in the present invention, four identical guide blocks 11 can be placed on the top of the lower compression platform 8. The gaps inside the four guide blocks 11 are used to vertically pass through the test piece 12 (i.e., the pipe fitting) that needs to undergo the compression test. The horizontal movement direction of the test piece 12 is guided by the guide blocks 11.

[0093] It should be noted that, for the present invention, a limiting device (i.e., spring 3) is provided on the guide post 4, and the limiting device is used to keep the center of the guide block 11 coincident with the central axis of the testing machine;

[0094] In the present invention, the outer ring 10 is kept aligned with the central axis of the testing machine by the positioning ring 6 , and the spring 3 provides the clamping force during the compression operation.

[0095] In the present invention, in a specific implementation, a vertically distributed upper platform center connecting column 201 is provided at the top center position of the upper compression platform 2;

[0096] The original (ie, inherent) upper clamping block 13 at the lower end of the upper clamping head 1 of the testing machine is connected (ie, clamped and connected) to the central connecting column 201 of the upper platform.

[0097] It should be noted that, for the external testing machine, the original (i.e., inherent) upper clamping block 13 at the lower end of the upper chuck 1 of the testing machine specifically includes two upper clamping blocks 13 distributed at intervals, and the two upper clamping blocks 13 are located in the upper clamping block accommodating notch groove (the bottom of the groove is open and passes through from front to back, and the cross-sectional shape is an inverted isosceles trapezoid) on the inner side of the lower end of the upper chuck 1 of the testing machine; the two upper clamping blocks 13 on the upper chuck 1 of the testing machine can move relative to each other to clamp or release the object placed in the gap between the two (such as the upper platform center connecting column 201).

[0098] In the present invention, a vertically distributed lower platform center connecting column 801 is provided at the bottom center position of the upper and lower compression platforms 8;

[0099] The original (i.e., inherent) lower clamping block 5 at the upper end of the lower clamping head 7 of the testing machine is connected (i.e., clamped) to the central connecting column 801 of the lower platform.

[0100] It should be noted that, for the external testing machine, the original (i.e., inherent) lower clamping block 5 at the upper end of the lower clamping head 7 of the testing machine specifically includes two spaced-apart lower clamping blocks 5, and the two lower clamping blocks 5 are located in a lower clamping block accommodating notch groove (the bottom of the groove is open and passes through from front to back, and the cross-sectional shape is an inverted isosceles trapezoid) on the inner side of the upper end of the lower clamping head 7 of the testing machine; the two lower clamping blocks 5 can move relative to each other to clamp or release an object placed in the gap between them (such as the lower platform center connecting column 801).

[0101] In the present utility model, in specific implementation, the material of the guide column 4 is 45 steel, and the guide column 4 is connected to the guide block 11 through an external thread; the guide column 4 passes through the guide column through hole reserved in the outer ring 10 to perform the guiding function and can be used to limit the movement trajectory of the guide block 11.

[0102] In the present invention, in a specific implementation, the inner diameter of the spring 3 is 10 mm, and the inner diameter material of the spring 3 is 304 stainless steel;

[0103] In a specific implementation, both ends of the spring 3 are connected to the guide block 11 and the outer ring 10 respectively, for applying pressure so that the guide block 11 can always press the test piece 12 (ie, the pipe) during the compression process.

[0104] In the present invention, in a specific implementation, the outer ring 10 is a ring with an inner diameter of 220 mm and an outer diameter of 240 mm;

[0105] The outer ring 10 is connected to the positioning ring 6 via a connecting rod 9 to ensure that the central axis of the guide block 11 coincides with the central axis of the testing machine.

[0106] In the present invention, in specific implementation, the testing machine is a compressor with mature existing technology and has been widely used, such as a universal compressor. Specifically, the universal testing machine model DDL-200 produced by China Machinery Testing Equipment Co., Ltd. can be used to apply compression load to pipe fittings (i.e. pipe parts).

[0107] In the present invention, in a specific implementation, the central axis of the upper chuck 1 of the testing machine, the central axis of the upper compression platform 2, the central axis of the lower chuck 7 of the testing machine and the central axis of the lower compression platform 8, as well as the central axis of the upper clamping block 13 and the central axis of the lower clamping block 5 all coincide and are located on the same straight line.

[0108] In the present invention, in a specific implementation, the material of the positioning ring 6 is 45 steel and consists of two semicircular rings;

[0109] The positioning ring 6 is connected to the lower chuck 7 of the testing machine by bolts and is connected to the outer ring 10 by a connecting rod 9. It is used to ensure that the axis of the outer ring 10 coincides with the central axis of the upper chuck 1 of the testing machine, the central axis of the upper compression platform 2, the central axis of the lower chuck 7 of the testing machine and the central axis of the lower compression platform 8, and to ensure that the axis of the outer ring 10 coincides with the central axis of the test piece 12 connected to the testing machine through the upper clamp 13 and the lower clamp 5.

[0110] In the present invention, in a specific implementation, the connecting rod 9 is made of 45 steel, and its upper and lower ends are connected to the outer ring 10 and the positioning ring 6 by welding respectively, so as to ensure that the central axis of the outer ring 10 coincides with the central axis of the positioning ring 6.

[0111] In the present invention, in a specific implementation, the top surface of the test piece 12 is in direct contact with the bottom surface of the upper compression platform 2 .

[0112] It should be noted that, for the present invention, since the bottom surface of the upper compression platform 2 is used to press against the top surface of the contact test piece 12, it can be applied to apply compression loads to test pieces 2 of multiple specifications and sizes (i.e., pipe parts).

[0113] In addition, for the present invention, considering that there will be errors when the upper compression platform 2 is connected, installed and clamped with the upper chuck 1 of the testing machine through a clamping block (i.e., the upper clamping block), it is impossible to ensure that the upper compression platform 2 and the axis of the testing machine (i.e., the central axis of the upper chuck 1 of the testing machine) are completely coincident. For this reason, the present invention fixes the positioning ring 6 on the fixed shaft at the lower end of the testing machine (i.e., the lower chuck 7 of the testing machine), and the central axis of the positioning ring 6 directly coincides with the central axis of the testing machine to achieve precise positioning.

[0114] In order to more clearly understand the technical solution of the present invention, the working principle of the present invention is described below.

[0115] According to the present invention, the test piece is guided by the spring, guide post, outer ring and guide block included in the guide mechanism to complete the centering.

[0116] In addition, the connecting rod and the positioning ring included in the positioning mechanism ensure that the central axis of the guide mechanism coincides with the central axis of the testing machine, thereby ensuring the accuracy of the centering.

[0117] The specific working process of this utility model is:

[0118] First, when the test is carried out, the axial compression centering device provided by the utility model is connected to the existing testing machine, and the reliability of the connection is checked, and whether the movement of the guide column 4 is smooth;

[0119] Then, the lower end of the test piece 12 is placed on the inclined surface inside the guide block 11, and the testing machine is turned on. The upper chuck 1 of the testing machine drives the upper compression platform 2 downward. The downward pressure applied causes the test piece 12 to move downward, and the guide block 11 approaches the outer ring 10 along the direction of the guide column 4. During this process, the presence of the spring 3 enables the guide block 11 to always press the test piece 12 so that it does not flip over until the test piece 12 falls to the top surface of the lower compression platform 8, completing the centering operation (that is, the central axis of the test piece coincides with the central axis of the testing machine).

[0120] Compared with the prior art, the axial compression centering device for pipe parts provided by the present invention has the following beneficial effects:

[0121] By means of the axial compression centering device for pipe parts provided by the present invention, when a pipe is subjected to a compression test, the central axis of the pipe as the test piece 12 is restricted by the guide block 11 to coincide with the central axis of the outer ring 10, and the outer ring 10 ensures that its own central axis coincides with the central axis of the positioning ring 6 through the connecting rod 9; the positioning ring 6 is installed on the lower chuck 7 of the testing machine to ensure that its own central axis coincides with the central axis of the lower chuck 7 of the testing machine, thereby effectively ensuring the centering accuracy of the pipe during the compression operation, improving the work efficiency of the pipe parts in performing the existing conventional compression repeatability test, reducing the test error, and improving the credibility of the test results.

[0122] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An axial compression centering device for pipe parts, characterized in that: It comprises an upper compression platform (2) and a lower compression platform (8), as well as a guide mechanism and a positioning mechanism; The guide mechanism includes a guide block (11), an outer ring (10), a guide post (4) and a spring (3); A positioning mechanism comprising a positioning ring (6) and a connecting rod (9); Wherein, the upper compression platform (2) is located directly above the lower compression platform (8); The top center position of the upper compression platform (2) is connected to the testing machine upper clamp (1) of the external testing machine; The bottom center position of the lower compression platform (8) is connected to the testing machine lower clamp (7) of the external testing machine; Wherein, a plurality of guide blocks (11) are placed on the top of the lower compression platform (8); A plurality of guide blocks (11) are circumferentially arranged on the inner side of an outer ring (10); An accommodating cavity for placing the lower end of the test piece (12) is formed between the inner side surfaces of the plurality of guide blocks (11); The outer side surface of each guide block (11) is provided with a radially distributed guide column (4); Each guide post (4) is sleeved with a helical spring (3); The outer end of the guide post (4) passes through the guide post through hole reserved on the outer ring (10); The outer end of the spring (3) is in tight contact with the inner wall of the outer ring (10); Wherein, the bottom circumferential sides of the outer ring (10) are connected to the circumferential outer wall of a positioning ring (6) via a connecting rod (9) respectively; The positioning ring (6) is fixedly connected to the lower end of the lower clamp (7) of the testing machine.

2. The axial compression centering device for pipe parts according to claim 1, characterized in that: The cross-sectional shapes of the upper compression platform (2) and the lower compression platform (8) are circular; The overall shape of the outer ring (10) is annular; The two connecting rods (9) are axially symmetrically distributed.

3. The axial compression centering device for tubular parts according to claim 1, characterized in that: A connecting rod (9), comprising a first vertical section (901), a second vertical section (902), a first horizontal section (903), and a second horizontal section (904); The upper end of the vertically distributed first vertical section (901) is connected to the bottom of the outer ring (10); The lower end of the first vertical section (901) is connected to the inner end of the horizontally distributed first horizontal section (903); The outer end of the first horizontal section (903) is connected to the upper end of the second vertical section (902) distributed vertically; The lower end of the second vertical section (902) is connected to the outer end of the horizontally distributed second horizontal section (904); The inner end of the second horizontal section (904) is connected to the circumferential outer wall of the positioning ring (6).

4. The axial compression centering device for tubular parts according to claim 3, characterized in that: The central axes of the first vertical section (901), the second vertical section (902), the first horizontal section (903), and the second horizontal section (904) are located on the same vertical plane; and / or, The first horizontal segment (903) and the second horizontal segment (904) are distributed along the radial direction of the outer ring (10); and / or, The first vertical section (901), the second vertical section (902), the first horizontal section (903) and the second horizontal section (904) are integrally formed.

5. The axial compression centering device for pipe parts according to claim 1, characterized in that: A positioning ring (6), comprising two semicircular rings; Each semicircular ring is fixedly connected to the lower end of the lower clamp (7) of the testing machine via a fastening bolt.

6. The axial compression centering device for pipe parts according to claim 1, characterized in that: A plurality of guide blocks (11) are placed around the top of the lower compression platform (8); A plurality of guide blocks (11) are surrounded to form an integral guide structure; When the test piece (12) is not placed inside the integral guide structure, the plurality of guide blocks (11) are connected in sequence, and the cross-sectional shape of the integral guide structure is a circular ring.

7. The axial compression centering device for pipe parts according to claim 1, characterized in that: Four guide blocks (11) are placed around the top of the lower compression platform (8); The four guide blocks (11) have the same shape and structure, and are all wedge-shaped blocks; and / or, The cross-sectional shape of the guide block (11) is a fan ring shape; and / or, The top and bottom surfaces of the guide block (11) are smooth planes; The outer side surface of the guide block (11) is a vertical plane; The inner side surface of the guide block (11) is an inclined surface, and the height of the inclined surface increases as the distance from the central axis of the lower compression platform (8) increases.

8. The axial compression centering device for a tubular component according to any one of claims 1 to 7, characterized in that: The circumferential outer side surface of the guide block (11) is provided with radially distributed bosses; The boss is provided with radially distributed threaded holes; The threaded hole on the boss is threadedly connected to the inner end of the guide column (4); The outer sides of the guide pillar (4) and the boss are covered with a spring (3).

9. The axial compression centering device for a tubular component according to any one of claims 1 to 7, characterized in that: A vertically distributed upper platform center connecting column (201) is provided at the top center of the upper compression platform (2); The upper clamping block (13) originally provided at the lower end of the upper clamping head (1) of the testing machine is connected to the central connecting column (201) of the upper platform; A vertically distributed lower platform center connecting column (801) is provided at the bottom center of the lower compression platform (8); The original lower clamping block (5) at the upper end of the lower clamping head (7) of the testing machine is connected to the central connecting column (801) of the lower platform.

10. The axial compression centering device for pipe parts according to claim 9, characterized in that: The central axis of the upper chuck (1) of the testing machine, the central axis of the upper compression platform (2), the central axis of the lower chuck (7) of the testing machine and the central axis of the lower compression platform (8), as well as the central axis of the upper clamping block (13) and the central axis of the lower clamping block (5) are all located on the same straight line.

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