CN219608728U - Heat exchanger tube and tube sheet pull-out force test fixture - Google Patents
Heat exchanger tube and tube sheet pull-out force test fixture Download PDFInfo
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- CN219608728U CN219608728U CN202320386657.0U CN202320386657U CN219608728U CN 219608728 U CN219608728 U CN 219608728U CN 202320386657 U CN202320386657 U CN 202320386657U CN 219608728 U CN219608728 U CN 219608728U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The utility model provides a pull-out force test fixture for a heat exchanger tube and a tube plate, which relates to the field of pull-out force tests for heat exchanger tubes and tube plates, and adopts the following scheme: the pipe plug comprises a push rod and a pipe plug, wherein a limiting hole is formed in the stress end of the pipe plug, a conical surface is formed in the force application end of the push rod, the limiting hole is a conical hole, and the force application end and the limiting hole can be matched in shape. The utility model can prevent the axial line of the force application end of the ejector rod and the axial line of the pipe plug from deflecting, and improve the accuracy of the test.
Description
Technical Field
The utility model relates to the field of pull-out force tests of heat exchanger tubes and tube plates, in particular to a pull-out force test fixture for heat exchanger tubes and tube plates.
Background
The shell-and-tube heat exchanger is widely applied to various industries such as chemical industry, petrochemical industry and the like, wherein a joint for connecting a tube and a tube plate is the place where failure is most likely to occur in equipment, the joint connection mode commonly used at present comprises expansion joint (mechanical expansion joint, hydraulic expansion joint, rubber expansion joint, explosion expansion joint and the like), welding and expansion welding combination, and the mechanical property of a welded structure of the tube and the tube plate is usually inspected by adopting a tube-tube plate welding test.
As shown in fig. 1, the conventional pull-out force test method comprises the following steps: firstly, one end of a tube-tube plate welding sample is firmly welded with a heat exchange tube by adopting a tube plug, the other end of the tube-tube plate welding sample is inserted into a mandril, then, an electronic universal testing machine is adopted to apply pressure to the mandril, the mandril transmits force to the welding seam structure of the tube plate and the heat exchange tube, the heat exchange tube can be ejected out of a tube plate hole of the tube plate by the mandril to fall off along with the continuous rising of pressure load, or the heat exchange tube yields due to the fact that the strength of the mandril is lower than the welding seam strength, and finally, the maximum pressure value is obtained by measurement, and the measurement is completed.
According to the upward pull-out force test method, the outer diameter of the ejector rod is smaller than the inner diameter of the heat exchange tube, in the test process, the ejector rod is easy to shake due to insufficient rigidity of the ejector rod, so that pressure cannot vertically act on the ejector rod, the ejector rod is easy to bend, the axis of the force application end of the ejector rod and the axis of the tube plug deflect, lateral component force is generated by the applied force, and the force applied by the tester is not completely acted on the heat exchange tube, so that the accuracy of a test result is affected.
Disclosure of Invention
In order to solve the problem that test results in the welding pull-out force test of the heat exchanger tube and the tube plate in the prior art are inaccurate, the utility model provides the test fixture for the pull-out force of the heat exchanger tube and the tube plate, which can prevent the axis of the force application end of the ejector rod from deflecting with the axis of the tube plug and improve the accuracy of the test.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a heat exchanger tube and tube sheet pull-out force test fixture, includes ejector pin and pipe plug, the atress end of pipe plug is provided with spacing hole, the application of force end of ejector pin is provided with the conical surface, spacing hole is the taper hole, the application of force end with spacing hole can shape fit. Through application of force end and spacing hole form fit, spacing hole parcel is lived the application of force end, can provide spacingly for the ejector pin, prevents that the ejector pin from being in the application of force in-process, because of bending deformation, application of force end axis and pipe plug axis take place the deflection, and the force of exerting can not be completely perpendicular to act on the pipe plug promptly heat exchange tube, causes test data to have the deviation, promotes experimental accuracy.
Furthermore, the conical surface of the force application end is a conical surface, and the limiting hole is a conical hole. Through conical surface and circular conical hole cooperation, the dismouting of ejector pin and spacing hole of being convenient for realizes quick location on the one hand, and on the other hand is convenient for process, has reduced the processing cost of this frock.
Further, the pipe plug is connected with the heat exchange pipe through connecting threads. The pipe plug is connected with the heat exchange pipe through threads, so that the pipe plug caused by welding quality can be prevented from falling off in the force application process of the ejector rod, test failure is caused, and the success rate of the test is improved.
Further, the connecting thread is a fine thread. The connection strength of the pipe plug and the heat exchange pipe can be further improved through the fine threads.
Further, the connecting screw thread is arranged on the outer circumferential surface of the pipe plug, and the connecting screw thread is used for being in threaded connection with the inner hole of the heat exchange pipe. The pipe plug is connected with the inner hole of the heat exchange pipe through the external thread, does not occupy the space of a sample, can realize the sequential test of not needing cutting and sampling for a plurality of heat exchange pipes, and is convenient for promote test efficiency.
Furthermore, a cross groove or a straight groove is formed in one end, opposite to the limiting hole, of the pipe plug. The pipe plug can be conveniently disassembled and assembled by arranging the cross groove or the straight groove.
Further, the hardness of the force application end of the ejector rod and the hole wall of the limit hole is b, and b is more than or equal to HRC42. The wear resistance of the ejector rod and the pipe plug can be improved, and the service life of the tool is prolonged.
Furthermore, the ejector rod and the pipe plug are made of hard alloy materials or quenched and tempered 35GrMo.
From the above technical scheme, the utility model has the following advantages:
the scheme provides a heat exchanger tube and tube plate pull-out force test fixture, the force application end is matched with the shape of a limit hole, the limit hole wraps the force application end, limit can be provided for a push rod, the push rod is prevented from deflecting with the axis of the tube plug circumference due to bending deformation in the force application process, the applied force cannot vertically act on the tube plug, so that test data have deviation, and the accuracy of a test is improved; the conical surface is matched with the conical hole, so that on one hand, the ejector rod and the limiting hole are convenient to disassemble and assemble to realize quick positioning, and on the other hand, the tooling is convenient to process, and the processing cost of the tooling is reduced; the pipe plug is connected with the heat exchange pipe through threads, so that the pipe plug caused by welding quality can be prevented from falling off in the force application process of the ejector rod, the test is failed, and the success rate of the test is improved; the pipe plug is connected with the inner hole of the heat exchange pipe through the external screw thread of the pipe plug, so that the space of a sample is not occupied, sequential test without cutting and sampling can be realized on a plurality of heat exchange pipes, and the test efficiency is convenient to improve; the connection strength of the pipe plug and the heat exchange pipe can be further improved through the fine threads; the cross groove or the straight groove is arranged, so that the pipe plug can be conveniently disassembled and assembled; the wear resistance of the ejector rod and the pipe plug can be improved by setting b to be more than or equal to HRC42, and the service life of the tool is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an assembly structure of a mandrel, a plug and a heat exchange tube in the prior art.
Fig. 2 is a schematic diagram of an assembly structure of a mandrel, a plug and a heat exchange tube according to an embodiment of the present utility model.
Fig. 3 is an enlarged view at a in fig. 2.
Fig. 4 is a schematic structural view of a mandrel according to an embodiment of the present utility model.
Fig. 5 is a schematic structural view of a pipe plug according to an embodiment of the present utility model.
Fig. 6 is a schematic diagram of an assembly structure of a pipe plug and a heat exchange pipe according to an embodiment of the present utility model.
In the figure, 1, a tube plate, 2, a heat exchange tube, 5, a tube plug, 51, a limiting hole, 52, a straight groove, 53, a connecting thread, 6, a push rod, 61, a force application end, 7, a support cushion block, 8 and a test platform.
Detailed Description
In order to make the objects, features and advantages of the present utility model more obvious and understandable, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the utility model are intended to be within the scope of the patent protection.
The inventor finds that in the existing heat exchanger tube and tube plate welding pull-out force test, the ejector rod is bent under the action of the test machine, the axis of the force application end of the ejector rod and the axis of the tube plug deflect, so that the applied force generates lateral component force, the force applied by the test machine does not completely act on the heat exchange tube, and the accuracy of the test result is affected; based on the above, in the embodiment of the utility model provided by the inventor, the force application end of the ejector rod is limited through the pipe plug, so that the phenomenon of axial deflection of the force application end is avoided, and the problem of deviation of test results in the prior art is solved.
As shown in fig. 2 to 5, the embodiment provides a heat exchanger tube and tube plate pull-out force test fixture, which comprises a push rod 6 and a tube plug 5, wherein a force bearing end of the tube plug 5 is provided with a limit hole 51, a force application end 61 is provided with a conical surface, the limit hole 51 is a conical hole, the force application end 61 and the limit hole 51 can be matched with each other in shape, the limit hole 51 can be a quadrangular conical hole or a conical hole, and correspondingly, the force application end 61 can be provided with a quadrangular conical surface or a conical surface, and the force application end 61 of the push rod 6 is provided with a conical surface, so that the manufacture is convenient; through application of force end 61 and spacing hole 51 form fit, spacing hole 51 parcel is applied force end 61, can provide spacingly for ejector pin 6, prevents that ejector pin 6 from being in the application of force in-process, because of bending deformation, application of force end 61 axis and pipe plug 5 week axis take place the deflection, and the force of exerting can not be totally perpendicular to act on pipe plug 5 promptly 2, causes test data to have the deviation, promotes experimental accuracy.
As shown in fig. 1, in the prior art, a pipe plug 5 is welded to the inner wall of a heat exchange pipe 2, and due to the problem of welding quality, the strength of a welding seam is insufficient, which often results in that the pipe plug 5 falls off before the heat exchange pipe 2 yields or before the welding seam of the heat exchange pipe 2 fails, in order to solve the problem, the pipe plug 5 is connected with the heat exchange pipe 2 through a connecting thread 53, specifically, the pipe plug 5 can be connected with the heat exchange pipe 2 with threads arranged on the outer surface through a threaded sleeve, and also the inner wall of the pipe plug 5 can be provided with internal threads which are connected with the heat exchange pipe 2 with threads arranged on the outer surface, so that the connection strength of the pipe plug 5 and the heat exchange pipe 2 is ensured, the pipe plug 5 is connected with the heat exchange pipe 2 through the use of fine threads, the reliability of the threaded connection is higher, and the falling problem of the pipe plug 5 and the heat exchange pipe 2 can be prevented.
In the prior art, in order to improve the working efficiency, the upper pipe plugs 5 are arranged in each heat exchange pipe 2, and then a pull-out test is performed one by one, so as to prevent the installation of the pipe plugs 5 from occupying the space outside the heat exchange pipes 2, and ensure that each heat exchange pipe 2 can be provided with the pipe plugs 5, as shown in fig. 5 and 6, the outer circumference of each pipe plug 5 is provided with a connecting thread 53, the connecting thread 53 is a fine thread, the pipe plugs 5 are connected with the inner holes of the heat exchange pipes 2 through the connecting thread 53, the pipe plugs 5 are completely installed inside the heat exchange pipes 2 and do not occupy the space outside the pipes, and ensure that each heat exchange pipe 2 can be provided with the pipe plugs 5; if the pipe plug 5 is connected with the outer wall of the heat exchange pipe 2 through the internal thread, the wall thickness of the pipe plug 5 cannot be set smaller due to larger stress when the pipe plug 5 is used, so that on one hand, the pipe plug 5 occupies the outer space of the pipe, interference exists among the pipe plugs 5, the disassembly and the assembly are inconvenient, meanwhile, the structure of the pipe plug 5 is more complex, the production and the manufacturing are inconvenient, and the interference problem exists when the threaded sleeve is used; in order to facilitate the disassembly and assembly, a cross groove or a straight groove 52 is arranged at one end of the pipe plug 5 opposite to the limiting hole 51, and in the specific embodiment, the straight groove 52 is adopted.
The hardness of the force application end 61 of the ejector rod 6 and the wall of the limit hole 51 is b, b is more than or equal to HRC42, the wear resistance of the ejector rod 6 and the pipe plug 5 can be improved, and the service life of the tool is prolonged; the ejector rod 6 and the pipe plug 5 are made of hard alloy materials or quenched and tempered 35GrMo.
The pull-out test process adopting the tool comprises the following steps:
s1, taking down the tube plate 1 from a test sample machine, sawing the heat exchange tube 2, and avoiding the influence of the strength reduction of the length of the heat exchange tube extending out of the tube plate 1 on the test result;
s2, machining internal threads on the pipe end of the heat exchange pipe 2;
s3, connecting the pipe plug 5 with the internal thread of the heat exchange pipe 2;
s5, selecting a proper supporting cushion block 7 to be placed on the test platform 8, placing the ejector rod 6 into the heat exchange tube 2, and matching the force application end 61 with the limit hole 51 in a shape;
and S6, starting the testing machine, continuing until the heat exchange tube 2 and the tube plate 1 are pulled out, and recording test data.
S7, adjusting the position of the tube plate 1 and the supporting cushion block 7, testing the other heat exchange tube 2, and repeating S5 and S6 until all the heat exchange tubes 2 are tested.
In the S1, the length of the heat exchange tube 2 extending out of the tube plate 1 is kept to be not less than 1.5D, D is the outer diameter of the heat exchange tube 2, when only the expansion joint pull-out force is needed to be measured, the welding seam of the heat exchange tube 2 adopting expansion welding is needed to be milled, and the complete expansion joint part is kept; s2, the length of the internal thread is not less than 1.2d, d is the nominal diameter of the 5 threads of the pipe plug, the nominal diameter of the internal thread of the heat exchange pipe 2 is moderately selected, and the depth of the threads is preferably 1/3 to 1/2 of the wall thickness of the heat exchange pipe 2; s3, the threads of the heat exchange tube 2 cannot be completely screwed, 2-3 threads are left to be not screwed, and the screwed length is not less than d; in S6, the stress application rate of the tester is not more than 25mm/min.
From the above detailed description, it can be seen that the present utility model has the following advantages:
1. through the shape matching of the force application end 61 and the limit hole 51, the limit hole 51 wraps the force application end 61, limit can be provided for the ejector rod 6, deflection of the axis of the force application end 61 and the axis of the pipe plug 5 due to bending deformation in the force application process of the ejector rod 6 is prevented, the applied force cannot vertically act on the pipe plug 5, deviation exists in test data, and the accuracy of a test is improved;
2. the conical surface is matched with the conical hole, so that on one hand, the ejector rod 6 and the limiting hole 51 are convenient to disassemble and assemble to realize quick positioning, and on the other hand, the tooling is convenient to process, and the processing cost of the tooling is reduced;
3. the pipe plug 5 is connected with the heat exchange pipe 2 through threads, so that the pipe plug 5 caused by welding quality can be prevented from falling off in the force application process of the ejector rod 6, the test is failed, and the success rate of the test is improved;
4. the pipe plug 5 is connected with the inner hole of the heat exchange pipe 2 through the external screw thread thereof, does not occupy the space of a sample, can realize sequential test of a plurality of heat exchange pipes 2 without cutting and sampling, and is convenient for improving test efficiency;
5. the connection strength of the pipe plug 5 and the heat exchange pipe 2 can be improved through fine threads;
6. the pipe plug 5 can be conveniently disassembled and assembled by arranging the cross groove or the straight groove 52;
7. the wear resistance of the ejector rod 6 and the pipe plug 5 can be improved by setting b to be more than or equal to HRC42, and the service life of the tool is prolonged.
The terms "upper," "lower," "outboard," "inboard," and the like in the description and in the claims of the utility model and in the above figures, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a heat exchanger tube and tube sheet pull-out force test fixture, includes ejector pin (6) and pipe plug (5), and its characterized in that, the atress end of pipe plug (5) is provided with spacing hole (51), and application of force end (61) of ejector pin (6) are provided with the conical surface, and spacing hole (51) are the taper hole, and application of force end (61) and spacing hole (51) can form fit.
2. The heat exchanger tube and tube sheet pull-out force test fixture according to claim 1, wherein the conical surface of the force application end (61) is a conical surface, and the limiting hole (51) is a conical hole.
3. The heat exchanger tube and tube sheet pull-out force test fixture according to claim 1, wherein the tube plug (5) is connected with the heat exchanger tube by connecting threads (53).
4. A heat exchanger tube and tube sheet pull-out force test fixture according to claim 3, wherein the connecting threads (53) are fine threads.
5. The heat exchanger tube and tube sheet pull-out force test fixture according to claim 4, wherein connecting threads (53) are arranged on the outer circumferential surface of the tube plug (5), and the connecting threads (53) are used for being in threaded connection with the inner holes of the heat exchanger tubes.
6. The heat exchanger tube and tube sheet pull-out force test fixture according to claim 5, wherein a cross groove or a straight groove (52) is arranged at one end of the tube plug (5) opposite to the limiting hole (51).
7. The heat exchanger tube and tube plate pull-out force test fixture according to claim 1, wherein the hardness of the force application end (61) of the ejector rod (6) and the hole wall of the limit hole (51) is b, and b is more than or equal to HRC42.
8. The heat exchanger tube and tube sheet pull-out force test fixture according to claim 7, wherein the ejector rod (6) and the tube plug (5) are both made of hard alloy materials or quenched and tempered 35GrMo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320386657.0U CN219608728U (en) | 2023-02-27 | 2023-02-27 | Heat exchanger tube and tube sheet pull-out force test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320386657.0U CN219608728U (en) | 2023-02-27 | 2023-02-27 | Heat exchanger tube and tube sheet pull-out force test fixture |
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| Publication Number | Publication Date |
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| CN219608728U true CN219608728U (en) | 2023-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320386657.0U Active CN219608728U (en) | 2023-02-27 | 2023-02-27 | Heat exchanger tube and tube sheet pull-out force test fixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664710A (en) * | 2024-01-31 | 2024-03-08 | 武汉东海石化重型装备有限公司 | Heat exchanger tube-tube plate pull-out force test process |
-
2023
- 2023-02-27 CN CN202320386657.0U patent/CN219608728U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664710A (en) * | 2024-01-31 | 2024-03-08 | 武汉东海石化重型装备有限公司 | Heat exchanger tube-tube plate pull-out force test process |
| CN117664710B (en) * | 2024-01-31 | 2024-04-16 | 武汉东海石化重型装备有限公司 | Heat exchanger tube-tube plate pull-out force test process |
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