CN108896388B - Force-pulse current coupling action experimental clamp - Google Patents
Force-pulse current coupling action experimental clamp Download PDFInfo
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- CN108896388B CN108896388B CN201810721533.7A CN201810721533A CN108896388B CN 108896388 B CN108896388 B CN 108896388B CN 201810721533 A CN201810721533 A CN 201810721533A CN 108896388 B CN108896388 B CN 108896388B
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- 230000001808 coupling effect Effects 0.000 title claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 12
- 230000007547 defect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000011810 insulating material Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000011160 research Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 12
- 239000000306 component Substances 0.000 description 7
- 239000008358 core component Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000008263 repair mechanism Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
Abstract
The invention provides a force-pulse current coupling experimental clamp, which comprises a left clamp head and a right clamp head; the left clamp head and the right clamp head are used for fixing two ends of a sample, and the clamping heads are connected with a force rod of a loading force device through a sleeve mechanism; the sleeve mechanism comprises an insulating sleeve, a cylindrical force sensor and a first insulating layer; the force sensor is arranged in the sleeve; the force sensor is matched with the inner wall of the insulating sleeve in a threaded structure, and one end of the force sensor is connected with the force rod; the front end of the insulating sleeve is sleeved at the fixed end of the clamping head to fix the clamping head; the first insulating layer is arranged between the force sensor and the clamping head; when the insulating sleeve rotates, the sleeve drives the force sensor to move in the insulating sleeve in a threaded structure so as to adjust the distance between the left clamp head and the right clamp head; the product can conveniently and safely carry out force-pulse current coupling effect experiments, and can ensure that the loading force and the loading pulse effect are not mutually influenced, thereby revealing the crack arrest mechanism of the metal component under the force-pulse current coupling effect.
Description
Technical Field
The invention relates to the technical field of experimental equipment, in particular to a force-pulse current coupling experimental clamp.
Background
From the end of the 20 th century, the original geometric shape and size of parts of the equipment are changed due to physical abrasion, breakage, fracture, chemical corrosion and other reasons in the service process of the product, the matching characteristics and working capacity among the parts are destroyed, and finally the normal operation of the parts, the assembly and even the whole machine is influenced. In the past, equipment containing cracks is considered to be irreparable, but the core components of the important mechanical equipment are expensive, high in added value, complex in processing technology and high in tolerance requirement, and the equipment has remarkable benefit and significance for repairing the crack defects of the products from the aspects of economy and sustainability and reliability.
Some core components of heavy machinery equipment are not repairable in the past, and are scrapped if cracks, particularly buried cracks, occur during the manufacturing process, which tends to result in significant waste. Therefore, the remanufacturing of the product and the repair of crack defects are key steps, and only the crack propagation is prevented, the safe operation of the mechanical product can be ensured, and the service life of the mechanical product is prolonged. However, it is difficult to repair buried cracks, and pulse current crack arrest is a relatively effective method at present. According to the invention, the force-pulse current coupling effect is realized by designing a novel test fixture, and under the condition that the loading force device quantitatively loads tensile stress or compressive stress on the component, the multiple insulating protective layers are arranged, so that the high-voltage pulse current effect can be simultaneously applied to the component, the loading force and the loading pulse effect are not mutually influenced, and the crack arrest mechanism of the metal component under the force-pulse current coupling effect is revealed. The experimental clamp solves the problem that the sample is difficult to level in the experimental process through the level gauge arranged on the clamp head, and simultaneously adjusts the relative position of the sample by adjusting the rotation position of the internal thread of the sleeve.
Disclosure of Invention
The invention provides a force-pulse current coupling effect experimental clamp which can conveniently and safely carry out a force-pulse current coupling effect experiment, and can ensure that the loading force and the loading pulse effect are not affected each other, thereby revealing the crack arrest mechanism of a metal component under the force-pulse current coupling effect.
The invention adopts the following technical scheme.
A force-pulse current coupling experimental clamp, comprising a left clamp head and a right clamp head; the left clamp head and the right clamp head are used for fixing two ends of a sample by using clamping heads, and the clamping heads are connected with a force rod of a loading force device through a sleeve mechanism; the sleeve mechanism comprises an insulating sleeve, a cylindrical force sensor and a first insulating layer; the force sensor is arranged in the sleeve; the side wall of the force sensor is matched with the inner wall of the middle part or the rear part of the insulating sleeve in a threaded structure, and one end of the force sensor is connected with the force rod; the front end of the insulating sleeve is rotatably sleeved at the fixed end of the clamping head to fix the clamping head; the first insulating layer is arranged between the force sensor and the clamping head; when the insulating sleeve rotates, the sleeve drives the force sensor to move in the insulating sleeve in a threaded configuration to adjust the distance between the left and right clamp heads.
A fastener is arranged at the clamping head in a penetrating way to fix the sample; and a second insulating layer is arranged at the intersection of the fastener and the clamping head.
The fastener comprises a threaded rod and an insulating nut screwed at the threaded rod; the threaded rod vertically penetrates through the threaded through hole of the sample; the test specimen is connected to an external power source through the metal portion of the fastener.
The loading force device is fixed at the experimental clamp fixing table; the force rod, the left clamp head and the right clamp head are positioned on the same horizontal straight line.
And the clamping heads of the left clamp head and the right clamp head are respectively provided with a level device at the intersecting position of the insulating sleeve, and when the levels at the two positions are indicated to be level, the sample fixed by the left clamp head and the right clamp head is in a horizontal posture.
In the invention, an insulating layer with good insulating property is arranged at the joint of the sleeve and the clamp head, and the influence of pulse current on the force sensor and the loading force device is isolated through the insulating layer; the force sensor in the sleeve is in threaded fit with the sleeve, and the distance between the members of the sample is further adjusted by adjusting the position of the rotary force sensor; the coupling effect of force-pulse current can be realized through various insulation protection, and the defect repair mechanism research of the metal component containing the defects under the stress condition can be conveniently, quickly and efficiently carried out.
According to the invention, the sleeve is connected with the force sensor through the internal threads, and the relative position of the test fixture head is adjusted by adjusting the thread position of the force sensor, so that the product can be applied to samples with different sample length sizes.
According to the invention, the clamp head is made of a material meeting the experimental loading strength and plasticity requirements, the sample is connected and fixed on the clamp head through the threaded rod, the contact position of the threaded rod and the clamp head is made of a circle of insulating material, and on the basis of sleeve insulation protection, the insulation property is increased through the insulating material; the nuts used by the test fixture are made of high-voltage resistant and insulating materials, so that the insulation and strength requirements of the test fixture in the test process are guaranteed, and the relative heights of all parts of the sample can be adjusted by adjusting the positions of the nuts.
The invention is provided with the level gauge, the level gauge can ensure that the relative position of the sleeve threads at the two fixed ends of the adjusting sample is horizontal, and simultaneously ensure that the sample keeps a horizontal position in the experimental process, thereby being beneficial to the research precision of the repairing mechanism of the experiment under the force-pulse coupling effect and reducing errors.
According to the invention, one end of the force rod is connected with the loading device, and the other end of the force rod is connected with the force sensor in the sleeve, and under the condition that the component is quantitatively loaded with tensile stress or compressive stress, the defect repairing mechanism research of the metal component containing defects under the stress condition can be conveniently and rapidly carried out by reading the numerical value of the force sensor.
In the invention, the test fixture adopts various insulation modes for insulation protection; the sleeve is internally provided with an insulating layer filled with insulating materials to insulate the clamp head from the loading force. An insulating layer is adopted between the clamp head and the threaded rod, so that the possibility of current leakage to the clamp head in the pulse loading process is further reduced; the nut adopted by the test fixture head is made of insulating materials, so that the position of a sample can be fixed through adjusting the nut, and an insulating effect can be achieved.
In the present invention; the screw thread through hole is processed at the sample department so that adopt threaded connection between sample and the threaded rod, improved the cooperation compactness, and then reduced the space between threaded rod and the sample when pulse current acts on, and then improved the electrically conductive effect under the pulse effect.
Drawings
The invention is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a schematic forward view of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a partial forward schematic view of the fixture head of the present invention;
FIG. 4 is a partial schematic top view of the clamp head of the present invention;
in the figure: 1-an experiment fixture fixing table; 2-loading force means (left); 3-force bar; 4-left clamp head; 5-right clamp head; 6-loading force device (right); 7-an experiment fixture fixed table base; 8-an insulating sleeve; 9-force sensor; 10-a first insulating layer; 11-a second insulating layer; 13-a fastener; 14-sample; 15-a level; 16-threaded rod.
Detailed Description
As shown in fig. 1-4, a force-pulse current coupling experimental clamp comprises a left clamp head 4 and a right clamp head 5; the left clamp head and the right clamp head are used for fixing two ends of a sample 14 by a clamping head 12, and the clamping head is connected with a force rod 3 of a loading force device (a left loading force device 2 and a right loading force device 6) through a sleeve mechanism; the sleeve mechanism comprises an insulating sleeve 8, a cylindrical force sensor 9 and a first insulating layer 10; the force sensor is arranged in the sleeve; the side wall of the force sensor is matched with the inner wall of the middle part or the rear part of the insulating sleeve in a threaded structure, and one end of the force sensor is connected with the force rod; the front end of the insulating sleeve is rotatably sleeved at the fixed end of the clamping head to fix the clamping head; the first insulating layer 10 is arranged between the force sensor and the clamping head; when the insulating sleeve rotates, the sleeve drives the force sensor to move in the insulating sleeve in a threaded configuration to adjust the distance between the left and right clamp heads.
A fastener is arranged at the clamping head in a penetrating way to fix the sample; the intersection of the fastener and the clamping head is provided with a second insulating layer 11.
The fastener comprises a threaded rod 16 and an insulating nut 13 screwed at the threaded rod; the threaded rod vertically penetrates through the threaded through hole of the sample; the test specimen is connected to an external power source through the metal portion of the fastener.
The loading force device is fixed at the experimental clamp fixing table 1; the force rod, the left clamp head and the right clamp head are positioned on the same horizontal straight line.
And the horizontal devices 15 are arranged at the intersecting positions of the clamping heads of the left clamp head and the right clamp head and the insulating sleeve, and when the horizontal devices at the two positions are indicated to be horizontal, the sample fixed by the left clamp head and the right clamp head is in a horizontal posture.
In this example, the test jig fixing table 1 is supported on the ground by a test jig fixing table base 7.
Before an experiment, the clamping heads of the left clamp head and the right clamp head are firstly subjected to horizontal adjustment operation until the level devices at the left clamp head and the right clamp head are all indicated to be horizontal, at the moment, the sample fixed by the left clamp head and the right clamp head is in a horizontal posture, the sleeves connected with the left clamp head and the right clamp head are also positioned on the same horizontal straight line, then the left loading force device 2 and the right loading force device 6 apply force to the sample through force rods, and an external power supply outputs pulse current to the sample through the metal part of the fastener for fixing the sample so as to perform the experiment.
Claims (1)
1. A force-pulse current coupling action experimental clamp is characterized in that: the experimental clamp comprises a left clamp head (4) and a right clamp head (5); the left clamp head and the right clamp head are used for fixing two ends of a sample (14) through clamping heads (12), and the clamping heads are connected with force rods (3) of the loading force devices (2) and (6) through sleeve mechanisms; the sleeve mechanism comprises an insulating sleeve (8), a cylindrical force sensor (9) and a first insulating layer (10); the force sensor is arranged in the sleeve; the side wall of the force sensor is matched with the inner wall of the middle part or the rear part of the insulating sleeve in a threaded structure, and one end of the force sensor is connected with the force rod; the front end of the insulating sleeve is rotatably sleeved at the fixed end of the clamping head to fix the clamping head; the first insulating layer (10) is arranged between the force sensor and the clamping head; when the insulating sleeve rotates, the sleeve drives the force sensor to move in the insulating sleeve in a threaded structure so as to adjust the distance between the left clamp head and the right clamp head;
a fastener is arranged at the clamping head in a penetrating way to fix the sample; a second insulating layer (11) is arranged at the intersection of the fastener and the clamping head;
the fastener comprises a threaded rod (16) and an insulating nut (13) screwed at the threaded rod; the threaded rod vertically penetrates through the threaded through hole of the sample; the sample is connected with an external power supply through the metal part of the fastener;
the loading force device is fixed at the experimental clamp fixing table (1); the force rod, the left clamp head and the right clamp head are positioned on the same horizontal straight line;
the clamping heads of the left clamp head and the right clamp head are respectively provided with a level device (15) at the crossing positions of the insulating sleeve, and when the level devices at the two positions are both indicated to be level, the sample fixed by the left clamp head and the right clamp head is in a level posture;
when the clamp is used, the influence of pulse current on the force sensor and the loading force device is isolated through the insulating layer at the joint of the sleeve and the clamp head; the force sensor in the sleeve is in threaded fit with the sleeve, and the distance between the sample and the component is further adjusted by adjusting the position of the rotary force sensor; the coupling effect of force-pulse current is realized through various insulation protection; the relative position of the test fixture head is further adjusted by adjusting the thread position of the force sensor, so that the fixture is applied to samples with different sample length sizes;
the nuts used by the clamp are made of high-voltage-resistant and insulating materials, and when the clamp is used, the relative heights of all parts of the sample are adjusted by adjusting the positions of the nuts;
when the clamp is used, the level of the relative positions of sleeve threads at the two fixed ends of the adjusting sample is ensured by the level gauge, and meanwhile, the sample is ensured to keep a horizontal position in the experimental process, so that the experimental repairing mechanism under the force-pulse coupling effect is researched with precision, and the error is reduced;
when the clamp is used, one end of the force rod is connected with the loading device, the other end of the force rod is connected with the force sensor in the sleeve, and under the condition that the component is quantitatively loaded with tensile stress or compressive stress, the research on the defect repairing mechanism of the metal component containing the defect under the stress condition is carried out by reading the numerical value of the force sensor;
when the clamp is used, the clamp head is insulated from the loading force through an insulating layer filled with insulating materials in the sleeve; the possibility of current leakage to the clamp head in the pulse loading process is reduced through the insulating layer between the clamp head and the threaded rod;
when the clamp is used, a threaded through hole is processed at the sample so as to enable the sample to be in threaded connection with the threaded rod to match the compactness, so that gaps between the threaded rod and the sample are reduced when pulse current acts, and the conductive effect under the pulse action is improved;
when the clamp is used, under the condition that the external loading device quantitatively loads tensile stress or compressive stress on the component, high-voltage pulse current is applied to the component, and the clamp enables the loading force and the loading pulse action not to be affected by each other through the arrangement of multiple insulating protection layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721533.7A CN108896388B (en) | 2018-07-04 | 2018-07-04 | Force-pulse current coupling action experimental clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810721533.7A CN108896388B (en) | 2018-07-04 | 2018-07-04 | Force-pulse current coupling action experimental clamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108896388A CN108896388A (en) | 2018-11-27 |
| CN108896388B true CN108896388B (en) | 2024-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810721533.7A Active CN108896388B (en) | 2018-07-04 | 2018-07-04 | Force-pulse current coupling action experimental clamp |
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| Country | Link |
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| CN (1) | CN108896388B (en) |
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| CN107727510A (en) * | 2017-11-29 | 2018-02-23 | 中南大学 | A kind of experimental rig of pulse current auxiliary bar samples uniaxial tension |
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| Publication number | Publication date |
|---|---|
| CN108896388A (en) | 2018-11-27 |
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