CN114166621A - Clamp for pipe tensile test and test method - Google Patents

Clamp for pipe tensile test and test method Download PDF

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Publication number
CN114166621A
CN114166621A CN202111491776.4A CN202111491776A CN114166621A CN 114166621 A CN114166621 A CN 114166621A CN 202111491776 A CN202111491776 A CN 202111491776A CN 114166621 A CN114166621 A CN 114166621A
Authority
CN
China
Prior art keywords
chuck
sleeve
pipe
ring layer
clamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111491776.4A
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Chinese (zh)
Inventor
王波
关喜峰
彭萌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AVIC Xian Aircraft Industry Group Co Ltd
Original Assignee
AVIC Xian Aircraft Industry Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AVIC Xian Aircraft Industry Group Co Ltd filed Critical AVIC Xian Aircraft Industry Group Co Ltd
Priority to CN202111491776.4A priority Critical patent/CN114166621A/en
Publication of CN114166621A publication Critical patent/CN114166621A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02Details
    • G01N3/04Chucks

Abstract

A clamp for a pipe tensile test and a using method thereof, the clamp comprises a sleeve, a chuck and a pre-tightening nut, a columnar chuck is arranged at the center of the lower end of the sleeve and can be fixed with a stretcher, a connecting through hole is arranged at the bottom of the lower end of the sleeve, a circular inner shaft is arranged at the center of an inner cavity of the sleeve, the chuck is matched with the sleeve, the central through hole of the chuck is matched with the inner shaft of the sleeve, an annular clamping groove is arranged between the outer ring layer and the inner ring layer and is matched with the pipe, a pull rod is arranged at the bottom of the chuck plate, an external thread matched with the pre-tightening nut is arranged on the pull rod, radial wedge-shaped openings communicated with the central through hole are arranged on the outer ring layer and the inner ring layer, so that the chuck plate forms a cone frustum structure with the diameter of the upper end larger than that of the lower end, by rotating the pre-tightening nut, the sleeve and the chuck perform relative motion, so that the pipe sample is uniformly clamped in both directions inside and outside the chuck, the thin-wall pipe is uniformly clamped, and the success rate of a tensile test of the thin-wall pipe is improved; in addition, the clamp has the advantages of simple structure, quickness in installation, high efficiency, real and effective detection result and capability of truly reflecting the performance condition of the material.

Description

Clamp for pipe tensile test and test method
Technical Field
The application relates to the field of tensile clamps, in particular to a clamp for a pipe tensile test and a test method.
Background
With the continuous development of the fields of aerospace, petroleum, chemical industry, nuclear power and the like, the high-temperature alloy pipe is more and more widely applied. At present, the clamp for the high-temperature alloy pipe tensile test is mainly a wedge-shaped tensile clamp, a plurality of devices such as pneumatic devices and hydraulic devices exist, the problems of complicated operation process, complicated structure, large size and the like exist, the clamping and the dismounting are complex, the clamping is unreliable, the clamping of the clamp is not uniform enough, the damage to a sample is large, and the fracture is easy to occur at the clamping position.
Disclosure of Invention
The application aims to provide a clamp for a pipe tensile test and a test method.
The clamp for the tensile test of the pipe is characterized by comprising a sleeve, a chuck and a pre-tightening nut, wherein the sleeve is cylindrical, a cylindrical chuck which protrudes outwards is arranged at the center of the lower end of the sleeve and can be fixed with a stretcher, a connecting through hole is formed in the bottom of the lower end of the sleeve, a circular inner shaft is arranged at the center of an inner cavity of the sleeve, the chuck is matched with the sleeve, the chuck comprises an outer ring layer, an inner ring layer and a central through hole, the central through hole is matched with the inner shaft of the sleeve, an annular clamping groove is formed between the outer ring layer and the inner ring layer, the diameter of the clamping groove is matched with that of the pipe, the width of the clamping groove is matched with the wall thickness of the pipe, the height of the clamping groove is smaller than that of the outer ring layer outer surface and the inner ring layer inner surface, the opening of the clamping groove is positioned at the upper end of the chuck, a pull rod is arranged at the bottom of the chuck and is provided with an external thread matched with the pre-tightening nut, the number and the positions of the pull rods are matched with the number and the positions of the connecting through holes at the lower end of the sleeve, radial wedge-shaped openings communicated with the central through hole are formed in the outer ring layer and the inner ring layer, so that the chuck plate forms a cone frustum structure with the upper end diameter larger than the lower end diameter, the lower end diameter of the chuck plate is smaller than the inner diameter of the sleeve, and the upper end diameter of the chuck plate is larger than the inner diameter of the sleeve.
The bottom of the lower end of the sleeve is provided with three connecting through holes which are uniformly distributed, and the bottom of the chuck plate is provided with three pull rods matched with the connecting through holes.
The chuck is characterized in that the outer ring layer and the inner ring layer are provided with three radial wedge-shaped openings communicated with the central through hole, and the wedge shape of each wedge-shaped opening points to the lower end of the chuck.
The use method of the clamp for the pipe tensile test is characterized by comprising the following steps: 1) inserting a port of a pipe into an interlayer clamping groove of a chuck, 2) sleeving the chuck and a pipe orifice of the pipe into a sleeve together, inserting an inner shaft of the sleeve into a central through hole of the chuck, and enabling a pull rod at the bottom of the chuck to penetrate through a connecting through hole at the bottom of the sleeve, and 3) driving a pull rod of the chuck by rotating a pre-tightening nut, so that an outer circular conical surface of an outer ring layer of the chuck, an inner circular conical surface of an inner ring layer of the chuck, an outer cylindrical surface of an inner shaft of the sleeve and a cylindrical surface of the inner side of the sleeve move relatively; 4) along with the relative movement between the chuck and the sleeve, the chuck and the pipe port gradually enter the sleeve, the inner ring layer of the chuck is extruded outwards from the inner part of the sleeve, the outer ring layer of the chuck is extruded inwards from the side wall of the sleeve, the width of the clamping groove of the chuck and the gap of the opening of the chuck are reduced and contracted, and the friction force between the clamping groove of the chuck and the pipe is increased, so that the chuck clamps the pipe port from the inside and the outside in a two-way manner; 5) and (3) similarly assembling the clamp at the other end pipe orifice of the pipe, and fixing the columnar chucks of the clamps at the two ends of the pipe with a stretcher respectively to perform a tensile test.
The beneficial effect of this application lies in: according to the clamp for the thin-wall high-temperature alloy pipe tensile test, the nut is pre-tightened through rotation, the sleeve and the chuck plate move relatively, so that the pipe sample is uniformly clamped in both directions inside and outside the chuck plate, the thin-wall pipe is uniformly clamped, and the success rate of the thin-wall pipe tensile test is improved; in addition, the clamp has the advantages of simple structure, quickness in installation, high efficiency, real and effective detection result and capability of truly reflecting the performance condition of the material.
The present application will be described in detail below with reference to the accompanying drawings of embodiments.
Drawings
FIG. 1 is a schematic view of a method of using a clamp for a pipe tensile test.
Fig. 2 is a schematic view of the structure of the bushing.
FIG. 3 is a schematic diagram of a chuck configuration.
The numbering in the figures illustrates: 1 pipe, 2 clamps, 3 sleeves, 4 chucks, 5 pre-tightening bolts, 6 chucks, 7 inner shafts, 8 connecting through holes, 9 pull rods, 10 outer ring layers, 11 inner ring layers, 12 central through holes, 13 clamping grooves and 14 gaps.
Detailed description of the invention
Referring to the attached drawings, the clamp for the pipe tensile test is the clamp 2 clamped at two ends of the pipe when the pipe 1 is stretched, the two ends of the pipe are clamped by the clamp 2, and the chuck 6 on the clamp can be fixed with a stretcher to stretch the pipe. The clamp of the present application contains a sleeve 3, a chuck 4 and a pre-tightened nut 5. The sleeve 3 is cylindrical, a cylindrical chuck 6 protruding outwards is arranged in the center of the lower end of the sleeve 3, the chuck 6 can be fixed with a stretcher, three connecting through holes 8 distributed uniformly are formed in the bottom of the lower end of the sleeve 3, and the connecting through holes are matched with three pull rods 9 distributed uniformly in the bottom of the chuck 4. The inner cavity of the sleeve 3 has a circular inner shaft 7 in the centre, which inner shaft 7 matches the central through hole 12 of the chuck. The chuck 4 is matched with the sleeve 3, the chuck 4 comprises an outer ring layer 10, an inner ring layer 11 and a central through hole 12, the central through hole 12 is matched with an inner shaft 7 of the sleeve, an annular clamping groove 13 is arranged between the outer ring layer 10 and the inner ring layer 11, the diameter of the clamping groove 13 is matched with that of the pipe 1, the width of the clamping groove 13 is matched with the wall thickness of the pipe 1, the height of the clamping groove 13 is less than the height of the outer surface of the outer ring layer 10 and the inner surface of the inner ring layer 11, the opening of the clamping groove 10 is positioned at the upper end of the chuck 4, a pull rod 9 is arranged at the bottom of the chuck 4, an external thread matched with a pre-tightening nut 5 is arranged on the pull rod 9, the number and the position of the pull rod 9 are matched with the number and the position of connecting through holes 8 at the lower end of the sleeve 3, three radial wedge-shaped openings 14 communicated with the central through hole 12 are arranged on the outer ring layer 10 and the inner ring layer 11, and the wedges of the wedge-shaped openings point to the lower end of the chuck, the wedge-shaped gap 14 enables the chuck 4 to form a cone frustum structure with the diameter of the upper end larger than that of the lower end, the diameter of the lower end of the chuck 4 is smaller than the inner diameter of the sleeve 3, and the diameter of the upper end of the chuck 4 is larger than the inner diameter of the sleeve.
When the pipe clamp is used, the two clamps 2 are respectively arranged at two ends of the pipe 1, when the clamps 2 are arranged, the port of the pipe 1 is inserted into the interlayer clamping groove 13 of the chuck 4, the chuck 4 and the pipe orifice of the pipe 1 are sleeved into the sleeve 3 together, the inner shaft 7 of the sleeve 3 is inserted into the central through hole 12 of the chuck 4, the pull rod 9 at the bottom of the chuck 4 penetrates through the connecting through hole 8 at the bottom of the sleeve 3, and the chuck pull rod 9 is driven by rotating the pre-tightening nut 5, so that the outer conical surface of the chuck outer ring layer 10, the inner conical surface of the chuck inner ring layer 11, the outer cylindrical surface of the sleeve inner shaft 7 and the cylindrical surface of the inner side of the sleeve 3 move relatively; along with the relative movement between the chuck 4 and the sleeve 3, the chuck 4 and the pipe port gradually enter the sleeve 3, the inner ring layer 11 of the chuck is extruded outwards by the inner shaft 7 of the sleeve, the outer ring layer 10 of the chuck is extruded inwards by the side wall of the sleeve 3, the width of the clamping groove 13 of the chuck and the clearance 14 of the chuck are reduced and contracted, the friction force between the clamping groove 13 of the chuck and the pipe 1 is increased, and the chuck 4 clamps the port of the pipe 1 from inside and outside in a two-way manner; and (3) similarly assembling the clamp at the other end pipe orifice of the pipe, and fixing the columnar chucks 6 of the clamps 2 at the two ends of the pipe 1 with a stretcher respectively to perform a tensile test.
After the stretching is finished, the pre-tightening nut 5 is rotated reversely, the chuck is pushed by the pull rod to be separated from the extrusion constraint of the sleeve, and the port of the pipe 1 is withdrawn from the chuck clamping groove 13.

Claims (4)

1. The clamp for the tensile test of the pipe is characterized by comprising a sleeve, a chuck and a pre-tightening nut, wherein the sleeve is cylindrical, a cylindrical chuck which protrudes outwards is arranged at the center of the lower end of the sleeve and can be fixed with a stretcher, a connecting through hole is formed in the bottom of the lower end of the sleeve, a circular inner shaft is arranged at the center of an inner cavity of the sleeve, the chuck is matched with the sleeve, the chuck comprises an outer ring layer, an inner ring layer and a central through hole, the central through hole is matched with the inner shaft of the sleeve, an annular clamping groove is formed between the outer ring layer and the inner ring layer, the diameter of the clamping groove is matched with that of the pipe, the width of the clamping groove is matched with the wall thickness of the pipe, the height of the clamping groove is smaller than that of the outer ring layer outer surface and the inner ring layer inner surface, the opening of the clamping groove is positioned at the upper end of the chuck, a pull rod is arranged at the bottom of the chuck and is provided with an external thread matched with the pre-tightening nut, the number and the positions of the pull rods are matched with the number and the positions of the connecting through holes at the lower end of the sleeve, radial wedge-shaped openings communicated with the central through hole are formed in the outer ring layer and the inner ring layer, so that the chuck plate forms a cone frustum structure with the upper end diameter larger than the lower end diameter, the lower end diameter of the chuck plate is smaller than the inner diameter of the sleeve, and the upper end diameter of the chuck plate is larger than the inner diameter of the sleeve.
2. The clamp for pipe tensile test according to claim 1, wherein the bottom of the lower end of the sleeve has three connecting through holes uniformly distributed, and the bottom of the chuck plate has three pull rods matching with the connecting through holes.
3. The clamp for pipe tensile test according to claim 1, wherein the chuck is provided with three radial wedge-shaped notches communicating with the central through hole on the outer ring layer and the inner ring layer, and the wedges of the wedge-shaped notches are directed to the lower end of the chuck.
4. A method of using the clamp for pipe tensile test according to claim 1, 2 or 3, comprising: 1) inserting a port of a pipe into an interlayer clamping groove of a chuck, 2) sleeving the chuck and a pipe orifice of the pipe into a sleeve together, inserting an inner shaft of the sleeve into a central through hole of the chuck, and enabling a pull rod at the bottom of the chuck to penetrate through a connecting through hole at the bottom of the sleeve, and 3) driving a pull rod of the chuck by rotating a pre-tightening nut, so that an outer circular conical surface of an outer ring layer of the chuck, an inner circular conical surface of an inner ring layer of the chuck, an outer cylindrical surface of an inner shaft of the sleeve and a cylindrical surface of the inner side of the sleeve move relatively; 4) along with the relative movement between the chuck and the sleeve, the chuck and the pipe port gradually enter the sleeve, the inner ring layer of the chuck is extruded outwards from the inner part of the sleeve, the outer ring layer of the chuck is extruded inwards from the side wall of the sleeve, the width of the clamping groove of the chuck and the gap of the opening of the chuck are reduced and contracted, and the friction force between the clamping groove of the chuck and the pipe is increased, so that the chuck clamps the pipe port from the inside and the outside in a two-way manner; 5) and (3) similarly assembling the clamp at the other end pipe orifice of the pipe, and fixing the columnar chucks of the clamps at the two ends of the pipe with a stretcher respectively to perform a tensile test.
CN202111491776.4A 2021-12-08 2021-12-08 Clamp for pipe tensile test and test method Pending CN114166621A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111491776.4A CN114166621A (en) 2021-12-08 2021-12-08 Clamp for pipe tensile test and test method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111491776.4A CN114166621A (en) 2021-12-08 2021-12-08 Clamp for pipe tensile test and test method

Publications (1)

Publication Number Publication Date
CN114166621A true CN114166621A (en) 2022-03-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111491776.4A Pending CN114166621A (en) 2021-12-08 2021-12-08 Clamp for pipe tensile test and test method

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CN (1) CN114166621A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116429573A (en) * 2023-04-17 2023-07-14 北京工业大学 Welding type IGBT module bonding wire tensile testing device and method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261385A (en) * 1995-03-24 1996-10-11 Nuclear Fuel Ind Ltd Jig for tube
CN104390856A (en) * 2014-12-16 2015-03-04 中国科学院合肥物质科学研究院 Clamp for metal thin-wall whole segment tube axial tension and compression fatigue test
CN104697851A (en) * 2015-01-29 2015-06-10 中国人民解放军第五七一九工厂 Thread pre-tensioning clamp for thin sheet tensioning test article
CN105158082A (en) * 2015-08-31 2015-12-16 中国船舶重工集团公司第七二五研究所 Auxiliary device for metal pipe high-temperature tension test and application method of auxiliary device
CN105179691A (en) * 2015-09-24 2015-12-23 哈尔滨工业大学 Clamping and sealing clamp for end of pipe
CN105571939A (en) * 2015-12-18 2016-05-11 中国人民解放军第五七一九工厂 High-temperature stretching test clamp for integral pipe with self-locking inner wall
CN111442974A (en) * 2019-01-17 2020-07-24 程彦 Clamping device for thin-wall steel pipe tensile test
US20210078082A1 (en) * 2019-09-12 2021-03-18 Smw-Autoblok Spannsysteme Gmbh Clamping device
CN113588407A (en) * 2021-08-09 2021-11-02 北京科技大学 On-site full-section drawing force measuring device and method for pipe seam type anchor rod

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08261385A (en) * 1995-03-24 1996-10-11 Nuclear Fuel Ind Ltd Jig for tube
CN104390856A (en) * 2014-12-16 2015-03-04 中国科学院合肥物质科学研究院 Clamp for metal thin-wall whole segment tube axial tension and compression fatigue test
CN104697851A (en) * 2015-01-29 2015-06-10 中国人民解放军第五七一九工厂 Thread pre-tensioning clamp for thin sheet tensioning test article
CN105158082A (en) * 2015-08-31 2015-12-16 中国船舶重工集团公司第七二五研究所 Auxiliary device for metal pipe high-temperature tension test and application method of auxiliary device
CN105179691A (en) * 2015-09-24 2015-12-23 哈尔滨工业大学 Clamping and sealing clamp for end of pipe
CN105571939A (en) * 2015-12-18 2016-05-11 中国人民解放军第五七一九工厂 High-temperature stretching test clamp for integral pipe with self-locking inner wall
CN111442974A (en) * 2019-01-17 2020-07-24 程彦 Clamping device for thin-wall steel pipe tensile test
US20210078082A1 (en) * 2019-09-12 2021-03-18 Smw-Autoblok Spannsysteme Gmbh Clamping device
CN113588407A (en) * 2021-08-09 2021-11-02 北京科技大学 On-site full-section drawing force measuring device and method for pipe seam type anchor rod

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116429573A (en) * 2023-04-17 2023-07-14 北京工业大学 Welding type IGBT module bonding wire tensile testing device and method
CN116429573B (en) * 2023-04-17 2023-12-08 北京工业大学 Welding type IGBT module bonding wire tensile testing device and method

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