CN111487140A - Needle tester and needle testing method - Google Patents
Needle tester and needle testing method Download PDFInfo
- Publication number
- CN111487140A CN111487140A CN201910074316.8A CN201910074316A CN111487140A CN 111487140 A CN111487140 A CN 111487140A CN 201910074316 A CN201910074316 A CN 201910074316A CN 111487140 A CN111487140 A CN 111487140A
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- needle
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- push rod
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- 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
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
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- 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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- 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
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- 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
- G01N2203/0075—Strain-stress relations or elastic constants
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
Abstract
A needle tester and a needle testing method relate to the technical field of needle testing, and comprise a bracket and further comprise: the fixing table is arranged on the bracket and used for fixing the tested needle a; and the rotating assembly is arranged on the bracket and provides swinging arc force for the tested needle a when rotating. The invention has the beneficial effects that: a professional tester is designed, so that the tested needle can be accurately measured, the acting force for testing the needle is always stable in position, and the force simulation is more accurate; the tester has multiple functions, and can perform resilience test, bending fatigue test, bending angle resistance test and fracture test.
Description
Technical Field
The invention relates to the technical field of needle test, in particular to a needle tester and a test method adopting the needle tester.
Background
The technology of producing nonwoven fabrics with needles has been known for over a hundred years, and various new types of needles are emerging continuously with technological development and technological progress. However, for the quality physical property detection of the needle, except for using the traditional hardness measurement to measure hardness, the outer micrometer and the caliper measurement size and using a metallographic microscope to detect metallographic structure detection, other special physical property detection instruments and equipment are not available, and the comprehensive physical property detection of various needles cannot be performed, so that the product standard, the detection index and the method exist at present, but no professional detection instrument and means exist for a long time, and the following problems are caused:
1. the user can not judge the quality of the needle (such as abrasion life, fracture resistance and rebound resilience, temperature rise generated by friction with the cloth cover and the like) without actual use.
2. Under the condition that users do not know the physical performance indexes of needles of various brands and models, the proper specification and model of the used needle cannot be selected according to the final requirements of product technology.
3. Under the condition that a needle manufacturer does not have a complete testing means and a complete testing instrument, the qualification rate of products is difficult to ensure and the quality of the products is further improved.
4. Professionals in scientific research institutions, colleges and research and development centers cannot accurately obtain the acting force of each needle or the whole needle when the needle or the whole needle punctures the fiber web and the effect generated on the fiber web when the novel material is used for developing a novel-function non-woven product.
5. The needle user is afraid to bring the function and efficiency of the needle used into full play.
In addition, the following test method is recorded in the textile industry standard of the people's republic of China FZ/T93048-2010: firstly, fixing the whole length of a needle bar of the puncture needle, applying a vertical external force at a certain position away from a fulcrum, moving the needle point of the puncture needle for a certain distance, keeping the external force for a certain time, removing the applied acting force, and then measuring the plastic deformation. In the method, the pricking pin slides with the external pressure head in the process of swinging and moving of the pricking pin by external force, and the acting point shifts.
Disclosure of Invention
The invention aims to realize comprehensive and accurate test of a sample needle to be tested, and designs a needle tester.
In order to achieve the above object, the technical solution of the present invention is that a needle tester includes a holder, and further includes: the fixing table is arranged on the bracket and used for fixing the tested needle a; and the rotating assembly is arranged on the bracket and provides swinging arc force for the tested needle a when rotating.
Further, the rotating assembly includes: the rotary table is arranged on the bracket; and the poking piece is fixedly arranged on the turntable and acts on the tested needle a.
Still further, a fixed cavity and a movable cavity which are intersected are arranged in the fixed platform, the fixed cavity is used for fixing the tested needle a, and a conductive rod is arranged in the movable cavity in the fixed platform; one end of the conductive rod is fixedly connected with one end of the first lead, and the other end of the conductive rod is opposite to the fixing cavity of the fixing table; the poking piece is a conductor, one end of the poking piece is fixedly connected with one end of the second lead, and the other end of the first lead and the other end of the second lead are respectively connected with the anode and the cathode of the power supply.
Furthermore, the device also comprises a compression spring, wherein the compression spring is arranged in the movable cavity of the fixed table, one end of the compression spring is fixed, and the other end of the compression spring is abutted to the conductive rod.
Furthermore, the testing device also comprises a dial, wherein the dial is fixedly arranged on the support, the extension lines of the scale marks of the dial are converged to one point, and the point is a swinging point fixed on the fixed table and used for the tested needle a.
The first swing rod is rotatably arranged on the bracket, and a pair of straight notches are formed in the first swing rod and are positioned on two sides of the rotating center of the first swing rod; the second swing rod is hinged to the rotary table, and one end of the second swing rod is connected to the rotary table through a pressure spring; the first push rod is arranged on the bracket in a sliding manner, one end of the first push rod is arranged in the straight notch of the first swing rod through a pin shaft, and the other end of the first push rod is opposite to the second swing rod; the second push rod is arranged in the bracket in a sliding manner, one end of the second push rod is arranged in the straight notch of the first swing rod through a pin shaft, the other end of the second push rod is opposite to the third push rod, and the first push rod and the second push rod are respectively and correspondingly arranged on two sides of the rotating center of the first swing rod; the third push rod is arranged in the rotary table in a sliding mode, and one end of the third push rod is arranged in a straight notch of the second swing rod through a pin shaft; and the clamping block is fixedly arranged at the other end of the third push rod and respectively stirs the needle to swing back and forth with the stirring piece.
The poking piece and the clamping block are respectively arranged on two sides of the needle.
The application also discloses a method of pin testing, comprising the steps of:
(1) fixing a tested needle a;
(2) applying arc force to the tested needle a to enable the tested needle a to swing;
(3) and removing the arc force, and carrying out final angle measurement on the tested needle a.
Still further, in the step (1), an initial zero point determination is performed on the tested needle a.
Still further, in the step (2), a unidirectional arc force or a divergently staggered arc force is applied to the tested needle a.
The invention has the beneficial effects that: a professional tester is designed, so that the tested needle can be accurately measured, the acting force for testing the needle is always stable, and the force simulation is more accurate; the tester has multiple functions and can perform resilience test, bending fatigue test, bending resistance, bending and breaking angle test and fracture test.
Drawings
FIG. 1 is a schematic structural diagram of an elastic bending fatigue testing device according to the present application;
FIG. 2 is a cross-sectional view taken at H-H in FIG. 1, wherein the first rocker is at the O point position;
FIG. 3 is a cross-sectional view taken at H-H in FIG. 1, wherein the first rocker is in the position of direction D1;
fig. 4 is a sectional view taken at H-H in fig. 1, in which the first swing link is in a D-direction position.
In the above figures, 1, a support; 2. a fixed table;
3. a rotating assembly; 31. a turntable; 32. a toggle piece;
4. a conductive rod; 5. a pressure spring; 6. a dial scale;
71. a first swing link; 72. a second swing link; 73. a first push rod; 74. a second push rod; 75. a third push rod; 76. a clamping block; a. the needle to be tested.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention with reference to the accompanying drawings and preferred embodiments is as follows:
a needle tester, as shown in fig. 1 to 4, comprises a support 1, a stationary table 2 and a rotating assembly 3.
As shown in fig. 1, a fixing table 2 is provided on a holder 1, and the fixing table 2 is used to fix a test needle a. The rotating component 3 is arranged on the bracket 1, and provides swinging arc force for the tested needle a when the rotating component 3 rotates. The arc force has the following effects: even if the tested needle a rotates under the action of the arc force, the action point of the arc force on the tested needle a is kept as constant as possible.
As for the rotating assembly 3, the following scheme can be adopted. The rotating assembly 3 comprises a turntable 31 and a toggle member 32. A turntable 31 is arranged on the stand 1, which turntable 31 can be driven by a servo motor or manually. As for the shape of the rotating disk 31, it may take various forms such as a circle, a bar or a fan. The toggle piece 32 is fixedly arranged on the rotary disc 31, and the toggle piece 32 acts on the tested needle a. Since the toggle element 32 needs to be in contact with the tested needle a, the contact position of the toggle element 32, that is, the action point in contact with the tested needle a is set to be arc-shaped, so as to improve the contact effect of the toggle element 32 and the tested needle a in the rotation process of the tested needle a.
The toggle 32 and the clamp block 76 are respectively disposed on both sides of the needle a. In order to measure the swing of the tested needle a, the following two reference schemes are designed.
One is as follows: the fixed table 2 is internally provided with a crossed fixed cavity and a crossed movable cavity which are arranged in a T shape, the fixed cavity is used for fixing a tested needle a, and the movable cavity in the fixed table 2 is internally provided with a conductive rod 4. One end of the conductive rod 4 is fixedly connected with one end of the first lead, and the other end of the conductive rod is opposite to the fixing cavity of the fixing table 2. The toggle member 32 is a conductive body, one end of the toggle member 32 is fixedly connected with one end of the second lead, and the other end of the first lead and the other end of the second lead are respectively connected with the positive electrode and the negative electrode of the power supply. The function here is to form a closed loop when the toggle 32 is in contact with the tested needle a, so as to accurately test the bending angle of the tested needle a. On the basis, a compression spring 5 is designed, the compression spring 5 is arranged in a movable cavity of the fixed table 2, one end of the compression spring 5 is fixed, and the other end of the compression spring 5 is abutted against the conductive rod 4, so that the conductive rod 4 is always contacted with the tested needle a, and a closed electric loop is formed. The scheme is used for electric control measurement.
The second step is as follows: the dial 6 is designed, the dial 6 is fixedly arranged on the fixed seat, and the extension lines of the scale marks of the dial 6 converge at one point, which is the swinging point of the tested needle a fixed on the fixed table 2. The scheme is used for manual measurement.
When fatigue fracture testing of the tested needle a is performed, the rotating assembly 3 needs to be controlled in both clockwise and counterclockwise directions. The present application provides the following design.
As shown in fig. 2 to 4, the first swing link 71 is rotatably disposed on the bracket 1, a pair of straight notches are disposed on the first swing link 71, the straight notches are located on two sides of a rotation center of the first swing link 71, and the first swing link 71 can swing between D and D1. The second swing link 72 is hinged to the rotary plate 31, one end of the second swing link is connected to the rotary plate 31 through a compression spring 5, and a fixing sleeve is arranged on the outer side of the compression spring 5, so that when the compression spring 5 is placed in a positive position, an acting force is applied to the second swing link 72, and the second swing link 72 is very easy to rotate. The first push rod 73 is arranged on the bracket 1 in a sliding manner, one end of the first push rod 73 is arranged in a straight notch of the first swing rod 71 through a pin shaft, and the other end of the first push rod 73 is opposite to the second swing rod 72; the second push rod 74 is slidably disposed in the bracket 1, one end of the second push rod 74 is disposed in a straight notch of the first swing link 71 through a pin shaft, the other end of the second push rod 74 is opposite to the third push rod 75, and the first push rod 73 and the second push rod 74 are respectively disposed on two sides of a rotation center of the first swing link 71. When the first swing link 71 is swung, the first push rod 73 and the second push rod 74 move, and one of the first push rod and the second push rod enters the rotating disc 31. Similar to the first push rod 73 and the second push rod 74, the third push rod 75 is slidably disposed in the rotary plate 31, and one end of the third push rod 75 is disposed in the straight notch of the second swing link 72 through a pin. The clamping block 76 is fixedly arranged at the other end of the third push rod 75 and toggles the needle a to swing back and forth with the toggle piece 32.
A method of needle testing, comprising the steps of:
(1) and fixing the tested needle a.
The test needle a is fixed to the fixed table 2. At this time, the initial angle can be measured to enhance the reliability of the test result, i.e. determine the initial zero point.
(2) And applying arc force to the tested needle a to make the tested needle a swing.
The tested needle a rotates under the action of the arc force, and the action point of the arc force on the tested needle a is kept unchanged as much as possible. This effect can be divided into two cases, one of which: and applying unidirectional arc force to the tested needle a to enable the tested needle to rotate along one direction. The second step is as follows: and applying arc force in different directions to the tested needle a to make the tested needle swing back and forth.
(3) And removing the arc force, and carrying out final angle measurement on the tested needle a.
And measuring the final state of the tested needle, and comparing the final angle state with the data of the initial angle state to obtain the required data.
First, rebound resilience test of the tested needle a
The tested needle a is clamped in a fixing cavity of the fixing table 2, and the bending corner distance, the bending corner times and the rotating speed are set through a touch screen connected with an electric control device. When a start key displayed by the touch screen is pressed, the turntable 31 starts to rotate slowly clockwise, when the toggle element 32 touches the tested needle a, a low-voltage safety current is communicated with the conductive rod 4 through the tested needle a to form an electric loop, and at the moment, the testing system can default the point to be a testing zero point or a testing starting point. Such actions are repeated three times to confirm that the zero point is correct, and if the zero point value of the three times exceeds the allowed error, the test system automatically stops the next test and prompts the following characters on a display screen: please confirm again whether the tested needle a is firmly fixed and the test is continued?
When the operator confirms that the tested needle a is firmly fixed, the operator clicks the next step, and the turntable 31 rotates clockwise at a preset rotation angle and distance to perform the resilience test. When the resilience is tested, the rotating speed of the turntable 31 is stable, slow and uniform, the action can be set to be one time or more according to the test rule, and the tested needle a is kept for 3 seconds or more after rotating to the set angular distance position; after the test is finished according to the set requirement, the turntable 31 returns to a certain point above the point A, the toggle piece 32 leaves the tested needle a, and the current is cut off; then, the toggle member 32 is slowly pressed down again, and when the current is conducted by slowly pressing down the toggle member, the rotation of the rotary disc 31 is stopped, and a value is generated, and the difference between the value and the previously confirmed zero point is the resilience index of the tested needle a.
Second, the anti-breaking angle test of the tested needle a
When the anti-breaking angle test is performed on the tested needle a, the toggle piece 32 firstly determines the zero point, and the toggle piece 32 slowly performs the circular motion. When the toggle element 32 contacts the tested needle a, the current is conducted, and the position is the "zero point", at this time, the toggle element 32 continues to press down around the point O1, until the current is interrupted when the tested needle a breaks, and the toggle element 32 stops moving. The value generated at this time is the value of the breaking angle resistance of the test needle a. The instrument also stores records to give linear graphs and data tables.
Third, bending fatigue fracture test of tested needle a
When the tested needle a is subjected to a bending fatigue fracture test, the toggle element 32 firstly confirms the accuracy of the zero point, then the servo motor drives the first swing rod 71, the first push rod 73 and the second push rod 74 swing from the point O to the point D along with the circle center of the first swing rod 71, under the action, the second push rod 74 moves forwards to push the clamping block 76 out of the turntable 31, and under the action of the pressure spring 5, the clamping block 76 cannot easily generate displacement. When the clamping block 76 is pushed out, the first swing link 71 returns to the point "O", and the second push rod 74 retracts to the original position. When the pushed-out clamping block 76 and the conductive pressure head form a jaw, the tested needle a is clamped in the jaw, and the jaw reciprocates by taking an O1 point of the bent rotary disk as a circle center: the needle a to be tested was repeatedly bent by rotating clockwise to point C and counterclockwise to point C1, and the points C, C1 and the number of bending times were set according to the test rules. When the test needle a is broken by bending fatigue, the current between the toggle member 32 and the conductive bar 4 is cut off, and the test is terminated. The tested bending angle, bending frequency, bending times and other data are stored and recorded. At this time, the first swing link 71 swings to the position D1, the first push rod 73 is driven to push forward, the first push rod 73 pushes one end of the second swing link 72 forward, the second swing link 72 swings to the other side under the action of the compression spring 5, the second swing link 72 drives the third push rod 75 and the clamping block 76 to retract into the rotary disc 31, and then the first swing link 71 returns to the "O position".
The tested needle a needs to swing for many times when being broken, so that the servo motor is utilized to drive the turntable 31, and the testing time can be reduced.
The invention has been described above with reference to a preferred embodiment, but the scope of protection of the invention is not limited thereto, and various modifications can be made and equivalents can be substituted for elements thereof without departing from the scope of the invention, and features mentioned in the various embodiments can be combined in any way as long as there is no structural conflict, and any reference sign in the claims should not be construed as limiting the claim concerned, from which the embodiment is to be regarded as being exemplary and non-limiting in any way. Therefore, all technical solutions that fall within the scope of the claims are within the scope of the present invention.
Claims (10)
1. A needle tester, comprising a support (1), characterized in that it further comprises:
the fixing table (2) is arranged on the bracket (1) and is used for fixing the tested needle (a); and
the rotating assembly (3) is arranged on the support (1), and provides swinging arc force for the tested needle (a) when the rotating assembly (3) rotates.
2. The needle tester according to claim 1, characterized in that the rotating assembly (3) comprises:
a turntable (31) arranged on the bracket (1); and
and the poking piece (32) is fixedly arranged on the turntable (31) and acts on the tested needle (a).
3. The needle tester according to claim 2, characterized in that a fixed cavity and a movable cavity are arranged in the fixed table (2) and intersect with each other, the fixed cavity is used for fixing the tested needle (a), and a conductive rod (4) is arranged in the movable cavity in the fixed table (2); one end of the conductive rod (4) is fixedly connected with one end of a first lead, and the other end of the conductive rod is opposite to the fixing cavity of the fixing table (2); the poking piece (32) is a conductor, one end of the poking piece (32) is fixedly connected with one end of the second lead, and the other end of the first lead and the other end of the second lead are respectively connected with the positive electrode and the negative electrode of the power supply.
4. The needle tester according to claim 3, further comprising a compression spring (5), wherein the compression spring (5) is disposed in the movable cavity of the fixed table (2), one end of the compression spring (5) is fixed, and the other end of the compression spring is abutted against the conductive rod (4).
5. The needle tester according to claim 1, further comprising a dial (6), wherein the dial (6) is fixedly arranged on the support (1), and extension lines of scale lines of the dial (6) converge at a point which is a swing point of a tested needle (a) fixed on the fixed table (2).
6. The needle tester of claim 3, further comprising
The first swing rod (71) is rotatably arranged on the bracket (1), a straight notch is formed in the first swing rod (71), and the straight notch is positioned on two sides of the rotating center of the first swing rod (71);
the second swing rod (72) is hinged to the rotary table (31), and one end of the second swing rod is connected to the rotary table (31) through a pressure spring;
the first push rod (73) is arranged on the bracket (1) in a sliding mode, one end of the first push rod is arranged in a straight notch of the first swing rod (71) through a pin shaft, and the other end of the first push rod is opposite to the second swing rod (72);
the second push rod (74) is arranged in the support (1) in a sliding mode, one end of the second push rod is arranged in a straight notch of the first swing rod (71) through a pin shaft, the other end of the second push rod is opposite to the third push rod (75), and the first push rod (73) and the second push rod (74) are respectively and correspondingly arranged on two sides of the rotating center of the first swing rod (71);
the third push rod (75) is arranged in the rotary disc (31) in a sliding mode, and one end of the third push rod is arranged in a straight notch of the second swing rod (72) through a pin shaft;
and the clamping block (76) is fixedly arranged at the other end of the third push rod (75) and stirs the needle (a) to swing back and forth with the stirring piece (32) respectively.
7. The needle tester of claim 6, wherein the toggle (32) and the clamp block (76) are disposed on either side of the needle (a).
8. A method of needle testing, comprising the steps of:
(1) fixing a tested needle a;
(2) applying arc force to the tested needle a to enable the tested needle a to swing;
(3) and removing the arc force, and carrying out final angle measurement on the tested needle a.
9. The method for needle testing according to claim 8, wherein in the step (1), an initial zero point determination is performed for the needle a under test.
10. The method for testing a needle according to claim 8, wherein in the step (2), a unidirectional arc force or a divergently staggered arc force is applied to the needle a to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910074316.8A CN111487140A (en) | 2019-01-25 | 2019-01-25 | Needle tester and needle testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910074316.8A CN111487140A (en) | 2019-01-25 | 2019-01-25 | Needle tester and needle testing method |
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| Publication Number | Publication Date |
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| CN111487140A true CN111487140A (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910074316.8A Pending CN111487140A (en) | 2019-01-25 | 2019-01-25 | Needle tester and needle testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078893A (en) * | 2022-08-22 | 2022-09-20 | 国网山东省电力公司高密市供电公司 | Wire current-carrying capacity simulation calculation device and simulation calculation method |
-
2019
- 2019-01-25 CN CN201910074316.8A patent/CN111487140A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115078893A (en) * | 2022-08-22 | 2022-09-20 | 国网山东省电力公司高密市供电公司 | Wire current-carrying capacity simulation calculation device and simulation calculation method |
| CN115078893B (en) * | 2022-08-22 | 2022-11-18 | 国网山东省电力公司高密市供电公司 | Wire current-carrying capacity simulation calculation device and simulation calculation method |
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