CN110987650A - Voussoir compresses tightly formula low temperature fatigue anchor clamps - Google Patents

Voussoir compresses tightly formula low temperature fatigue anchor clamps Download PDF

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Publication number
CN110987650A
CN110987650A CN201911388239.XA CN201911388239A CN110987650A CN 110987650 A CN110987650 A CN 110987650A CN 201911388239 A CN201911388239 A CN 201911388239A CN 110987650 A CN110987650 A CN 110987650A
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CN
China
Prior art keywords
wedge
rotating shaft
spout
handle
jaws
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.)
Withdrawn
Application number
CN201911388239.XA
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Chinese (zh)
Inventor
秦政琪
孙岩
张业伟
王志锋
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Shenyang Aerospace University
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Shenyang Aerospace University
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Publication date
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Priority to CN201911388239.XA priority Critical patent/CN110987650A/en
Publication of CN110987650A publication Critical patent/CN110987650A/en
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/18—Performing tests at high or low temperatures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0073—Fatigue
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0228—Low temperature; Cooling means

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention relates to a positioning and clamping device for a thin plate piece in a low-temperature environment, in particular to an improved wedge block compression type low-temperature fatigue clamp. The clamp comprises a jaw, a wedge block, a rotating shaft, a positioning piece, a ratchet wheel, a lock head, a top cover, a shaft sleeve, a sliding groove, a handle and a spring. The rotating shaft is provided with positive and negative threads and is connected with the wedge block, the lower surface of the wedge block is contacted with the upper surface of the jaws, the rotating shaft can drive the two symmetrically-arranged wedge blocks to simultaneously draw close to the center or simultaneously separate from two sides due to the fact that the rotating shaft is provided with the positive and negative threads, when the wedge blocks draw close to the center, the jaws are driven to move downwards, and the two symmetrically-arranged jaws draw close to the center due to the limitation of the positioning piece, so that the thin plate test piece is clamped. The wedge-shaped block can still prevent the looseness when the test piece is tensioned and compressed under the low-temperature environment to carry out alternating load. The invention overcomes the defect that the jaw can not be jacked when the jaw is pressed, eliminates the influence on a temperature field when a hydraulic chuck is adopted, and improves the reliability and the test accuracy.

Description

Voussoir compresses tightly formula low temperature fatigue anchor clamps
Technical Field
The invention relates to a positioning and clamping device for a thin plate piece in a low-temperature environment, in particular to an improved wedge block compression type low-temperature fatigue clamp, and belongs to the technical field of application of tensile-compression fatigue test clamps for the thin plate piece in a mechanical structure.
Background
The chuck of the testing machine is widely applied to the field of static mechanics experiments and fatigue tests, a hydraulic chuck is generally adopted for clamping in the tensile and compressive fatigue tests of sheet parts, but the reliability of the hydraulic chuck cannot be guaranteed in a low-temperature environment, and the flowing of hydraulic oil brings a large amount of heat to the low-temperature environment, so that the original temperature field is damaged. Therefore, a mechanical structure chuck is required to be adopted in the tensile and compressive fatigue test in the low-temperature environment. The mechanical mechanism chuck is usually used in a static mechanics experiment, so the mechanical structure chuck used at present is a ejector rod type chuck usually, and a wedge block and a clamp body are propped to make a test piece unable to be separated when receiving tensile force, but the structure capable of propping the wedge block is absent when receiving the tensile force, and the ejector rod has a certain elastic deformation amount, so that the test piece cannot be clamped, and the reliability of the chuck cannot be ensured. The main problem that the fatigue testing machine chuck that uses at present can't died the wedge when receiving pressure, leads to the test piece to loosen easily when drawing pressure alternating load and deviate from the scheduling problem.
Disclosure of Invention
The invention aims to overcome the technical defects of the fatigue testing machine chuck and designs a positioning and clamping device of a thin plate piece, which can reliably clamp a wedge-shaped block when tension and compression alternating loads are applied in a low-temperature environment. In order to prevent the wedge block from loosening, the invention adopts two wedge blocks loaded transversely to replace the ejector rod, and the two ejector blocks are connected to the same rotating shaft by positive and negative threads.
In order to achieve the purpose, the invention adopts the following technical scheme: a wedge block compression type low-temperature fatigue clamp comprises a jaw, a wedge block, a rotating shaft, a positioning piece, a gasket, a ratchet wheel, a lock head, a top cover, a shaft sleeve, a sliding groove, a stop block, a handle and a spring.
The rotating shaft is provided with positive and negative threads and is in threaded connection with the wedge block, the lower surface of the wedge block is in contact with the upper surface of the jaw, and the rotating shaft can drive the two symmetrically arranged wedge blocks to simultaneously draw close to the center or simultaneously separate to two sides due to the fact that the rotating shaft is provided with the positive and negative threads. When the wedge block is closed to the center, the jaws are driven to move downwards and the two symmetrically arranged jaws are closed to the center due to the limitation of the positioning piece, so that the thin plate test piece is clamped. The clamp body can limit the movement of the jaw when the test piece is under tension, and the wedge block can limit the movement of the jaw when the test piece is under compression, so that the aim of preventing loosening is fulfilled when the test piece is under tension and alternating load.
The convex part of the wedge is embedded into the sliding groove of the top cover, so that the rotation of the wedge can be limited, and the upper surface of the wedge is always kept horizontal. When the rotating shaft rotates, the top cover limits the rotating shaft and the wedges to rotate relatively, and because the threads on the rotating shaft are positive and negative threads, the two wedges which are symmetrically arranged are mutually closed or separated by the relative rotation of the rotating shaft and the wedges.
A gasket and a ratchet wheel are installed on one side of the rotating shaft, and the self-locking effect can be achieved when the test piece is locked. The axle sleeve passes through the bolt and is connected with the setting element, and the spout is installed to one side of setting element, and the spout is connected with the dog, is convenient for install tapered end and spring. The handle is connected with the lock, a protrusion is arranged below the handle and can slide in the arc-shaped sliding groove of the sliding groove, and the lock can move up and down in the vertical sliding groove of the sliding groove, so that the lock is driven to move up and down when the handle is rotated, the spring limits the downward movement of the lock, the arc-shaped sliding groove on the sliding groove limits the movement track of the protrusion on the handle, the position of the lock can be fixed relative to the sliding groove when the handle rotates to the extreme position, and the self-locking and the non-self-locking of the ratchet wheel are realized.
The invention has the advantages and characteristics that: by using the wedge block compression type low-temperature fatigue clamp, the defect that a jaw cannot be jacked when the clamp is stressed is overcome, the influence on a temperature field when a hydraulic chuck is adopted is eliminated, the reliability of the chuck is improved, and the accuracy of a test is improved. The wedge block compression type low-temperature fatigue clamp designed by the invention has the function that the wedge block can still prevent loosening when the test piece is tensioned and compressed under a low-temperature environment to carry out alternating load.
Drawings
FIG. 1 is a front view of the present invention
Fig. 2 is a sectional view taken along line C-C in fig. 1.
Fig. 3 is a right side view of fig. 1.
Shown in the figure: 1-clamping a jaw; 2-wedge block; 3-a rotating shaft; 4-a positioning element; 5-a gasket; 6-ratchet wheel, 7-lock head; 8-a top cover; 9-shaft sleeve; 10-a chute; 11-a stop block; 12-a handle; 13-spring
Detailed description of the preferred embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in figure 1, a rotating shaft 3 with positive and negative threads is in threaded connection with a wedge 2, the lower surface of the wedge 2 is in contact with the upper surface of a jaw 1, and the rotating shaft 3 can drive two symmetrically arranged wedges 2 to simultaneously draw together towards the center or separate towards two sides simultaneously due to the positive and negative threads. When the wedge block 2 is closed to the center, the jaws 1 are driven to move downwards and the two symmetrically arranged jaws 1 are closed to the center due to the limitation of the positioning piece 4, so that the thin plate test piece is clamped. The clamp body 4 can limit the movement of the jaw 1 when the test piece is under tension, and the wedge 2 can limit the movement of the jaw 1 when the test piece is under compression, so that the aim of preventing loosening is achieved when the test piece is under tension and alternating load.
As shown in fig. 2, the protruding portion of the wedge 2 is fitted into the slide groove of the top cover 8, and the rotation of the wedge 2 is restricted so that the upper surface of the wedge 2 is always horizontal. When the rotating shaft 3 rotates, the top cover 8 limits the rotating shaft 3 and the wedge 2 to rotate relatively, and because the threads on the rotating shaft 3 are positive and negative threads, the relative rotation of the rotating shaft 3 and the wedge 2 enables the two symmetrically arranged wedges 2 to be close to or separate from each other.
As shown in figures 1 and 3, a gasket 5 and a ratchet 6 are arranged on one side of the rotating shaft 3, and a self-locking effect can be achieved when a test piece is locked. One side of the positioning piece 4 is provided with a sliding groove 10, and the sliding groove 10 is connected with a stop block 11, so that the lock head 7 and the spring 13 can be conveniently installed. The handle 12 is connected with the lock head 7, a bulge is arranged below the handle and can slide in the arc-shaped chute of the chute 10, and the lock head 7 can move up and down in the vertical chute of the chute 10, so that the lock head is driven to move up and down when the handle 12 is rotated, the spring 13 limits the downward movement of the lock head 7, the arc-shaped chute on the chute 10 limits the motion track of the bulge on the handle 12, the position of the lock head 7 can be fixed relative to the chute when the handle 12 rotates to the extreme position, and the self-locking and the non-self-locking of the ratchet 6 are realized. When the clamp is in a state shown in figure 3, the handle 12 is pulled leftwards, the ratchet wheel 6 is self-locked, the rotating shaft 3 can be rotated to enable the two wedge blocks 2 to be close to each other, a certain extrusion force is generated on the jaw 1, so that a test piece is not easy to loosen from the clamp, the handle 12 is pulled rightwards, the ratchet wheel 6 is not self-locked, the rotating shaft 3 can be rotated to enable the two wedge blocks 2 to be mutually separated to eliminate the extrusion force on the jaw, and the test piece can be easily separated from the clamp. Because the rotating shaft 3 is inconvenient to install, after the rotating shaft 3 is installed in the groove of the positioning part 4, the shaft sleeve 9 is connected with the positioning part 4 through a bolt to determine the position of the shaft center of the rotating shaft 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (3)

1. The utility model provides a voussoir compresses tightly formula low temperature fatigue anchor clamps which characterized in that: the clamping device comprises jaws, wedge blocks, a rotating shaft, a positioning piece, a ratchet wheel, a lock head, a top cover, a shaft sleeve, a sliding groove, a handle and a spring, wherein the rotating shaft is provided with positive and negative threads and is connected with the wedge blocks, the lower surface of the wedge blocks is contacted with the upper surface of the jaws, the rotating shaft can drive the two symmetrically-arranged wedge blocks to simultaneously draw close to the center or simultaneously separate from two sides due to the fact that the rotating shaft is provided with the positive and negative threads, when the wedge blocks draw close to the center, the jaws are driven to move downwards and the two symmetrically-arranged jaws draw close to the center due to.
2. The wedge hold down cryogenic fatigue clamp of claim 1, wherein: the protruding part of the wedge is embedded into the sliding groove of the top cover, the rotation of the wedge is limited to enable the upper surface of the wedge to be always kept horizontal, the rotation of the top cover enables the rotating shaft and the wedge to rotate relatively when the rotating shaft rotates, and the relative rotation of the rotating shaft and the wedge enables two symmetrically arranged wedges to be mutually close to or separated from each other.
3. The wedge hold down cryogenic fatigue clamp of claim 1, wherein: the utility model discloses a lock, including pivot, setting element, spout, handle, spring, the handle is connected with the tapered end, gasket and ratchet are installed to one side of pivot, and the spout is installed to one side of setting element, and the spout is connected with the dog, and the handle is connected with the tapered end, and there is a arch below to slide in the arc spout of spout, and the tapered end can reciprocate in the vertical spout of spout, and moving down of spring restriction tapered end, the bellied motion orbit on the arc spout restriction handle on the spout makes the position of tapered end can be fixed for the spout when the handle rotates extremely limiting position to realize.
CN201911388239.XA 2019-12-30 2019-12-30 Voussoir compresses tightly formula low temperature fatigue anchor clamps Withdrawn CN110987650A (en)

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CN201911388239.XA CN110987650A (en) 2019-12-30 2019-12-30 Voussoir compresses tightly formula low temperature fatigue anchor clamps

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110987651A (en) * 2019-12-30 2020-04-10 沈阳航空航天大学 Nut pressing type low-temperature fatigue device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200972439Y (en) * 2006-11-15 2007-11-07 济南试金集团有限公司 Wedge lever-type stretch chuck
CN102914468A (en) * 2012-09-28 2013-02-06 清华大学 Compression-resisting clamping tool for testing compression resistance of non-metallic materials
CN103760014A (en) * 2013-12-24 2014-04-30 深圳市瑞格尔仪器有限公司 Hydraulic horizontally pushing clamp
CN103969119A (en) * 2014-05-26 2014-08-06 吉林大学 Clamping device of tensile testing machine suitable for plate-shaped samples
CN104089815A (en) * 2014-06-10 2014-10-08 吉林大学 Clamp used for test piece sample in function material microscopic performance in-situ testing
CN106840867A (en) * 2017-04-05 2017-06-13 北京航空航天大学 The drawing by high temperature fatigue test clamper and method of a kind of flat test piece
CN107228796A (en) * 2017-06-26 2017-10-03 长春机械科学研究院有限公司 A kind of horizontal sliding wedge-shaped clamping device
CN206725349U (en) * 2017-04-06 2017-12-08 中国石油大学(华东) A kind of clamp of stretching tester

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN200972439Y (en) * 2006-11-15 2007-11-07 济南试金集团有限公司 Wedge lever-type stretch chuck
CN102914468A (en) * 2012-09-28 2013-02-06 清华大学 Compression-resisting clamping tool for testing compression resistance of non-metallic materials
CN103760014A (en) * 2013-12-24 2014-04-30 深圳市瑞格尔仪器有限公司 Hydraulic horizontally pushing clamp
CN103969119A (en) * 2014-05-26 2014-08-06 吉林大学 Clamping device of tensile testing machine suitable for plate-shaped samples
CN104089815A (en) * 2014-06-10 2014-10-08 吉林大学 Clamp used for test piece sample in function material microscopic performance in-situ testing
CN106840867A (en) * 2017-04-05 2017-06-13 北京航空航天大学 The drawing by high temperature fatigue test clamper and method of a kind of flat test piece
CN206725349U (en) * 2017-04-06 2017-12-08 中国石油大学(华东) A kind of clamp of stretching tester
CN107228796A (en) * 2017-06-26 2017-10-03 长春机械科学研究院有限公司 A kind of horizontal sliding wedge-shaped clamping device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110987651A (en) * 2019-12-30 2020-04-10 沈阳航空航天大学 Nut pressing type low-temperature fatigue device

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Application publication date: 20200410

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