Needle Tester and Needle Testing Method

Abstract

A needle tester and a needle testing method, relating to the technical field of needle testing, including a bracket, and further including: a fixed table, arranged on the bracket and used for fixing the needle a to be tested; and a rotating component, arranged on the bracket, and when the rotating component rotates, it provides a swinging arc force for the needle a to be tested. The beneficial effects of the present invention are: a professional tester is designed, which can accurately measure the needle to be tested, so that the acting force for testing the needle is always in a stable position, and the force simulation is more accurate; the tester has multiple functions and can perform resilience testing, bending fatigue testing, anti-bending angle testing and fracture testing.

Description

Technical Field

[0001] The present invention relates to the technical field of needle testing, in particular to a needle tester and a testing method using the tester. Background Art

[0002] The technology of producing non-woven fabrics with needles has a history of more than one hundred years. With the development of science and technology and technological progress, various new types of needles have emerged continuously. However, for the detection of the physical properties of needles, in addition to using traditional hardness testers to measure hardness, outside micrometers and calipers to measure dimensions, and metallographic microscopes to detect metallographic structures, there are no other dedicated physical property detection instruments and equipment, and it is impossible to comprehensively evaluate the physical properties of various needles. As a result, there are currently product standards, detection indicators and methods, but there is a long-term lack of professional testing instruments and means, which brings the following problems:

[0003] 1. Users cannot determine the quality of needles (such as wear life, anti-breaking and resilience, temperature rise generated by friction with the fabric surface, etc.) without actual use.

[0004] 2. Without knowing the physical property indicators of various types of needles of each brand, users cannot select the appropriate needle specifications, models and brands according to the final requirements of the product process.

[0005] 3. Without complete testing means and testing instruments, it is difficult for needle manufacturers to ensure the qualified rate of products and further improve product quality.

[0006] 4. When professionals in scientific research institutions, universities and research and development centers want to develop new non-woven products using new materials, they cannot accurately obtain the acting force of each needle or the whole plate of needles when piercing the fiber web and the effect on the fiber web.

[0007] 5. Needle users do not dare to fully utilize the functions and efficiency of the needles they use.

[0008] In addition, the following test method is recorded in the "Textile Industry Standard of the People's Republic of China" FZ / T93048-2010: First, fix the entire length of the needle bar of the lancet, apply a vertical external force at a certain position from the fulcrum, the tip of the lancet moves a certain distance, after maintaining the external force for a certain time, remove the applied acting force, and then measure the plastic deformation amount. During the process of the external force moving with the swing of the lancet, the lancet will slide with the external force indenter, and the acting point will shift. Summary of the Invention

[0009] The purpose of the present invention is to achieve a comprehensive and accurate test of the sample needles to be tested, and a needle tester is designed.

[0010] In order to achieve the above-mentioned purpose, the technical solution of the present invention is a needle tester, comprising a bracket, and also comprising: a fixing platform, which is arranged on the bracket and is used to fix the tested needle a; and a rotating component, which is arranged on the bracket and provides a swinging arc force for the tested needle a when the rotating component rotates.

[0011] Furthermore, the rotating assembly includes: a turntable, which is arranged on the bracket; and a toggle member, which is fixedly arranged on the turntable and acts on the tested needle a.

[0012] Furthermore, the fixed platform is provided with an intersecting fixed cavity and a movable cavity, the fixed cavity is used to fix the tested needle a, and the movable cavity in the fixed platform is provided with a conductive rod; one end of the conductive rod is fixedly connected to one end of the first wire, and the other end faces the fixed cavity of the fixed platform; the toggle member is a conductor, one end of the toggle member is fixedly connected to one end of the second wire, and the other end of the first wire and the other end of the second wire are respectively connected to the positive and negative poles of the power supply.

[0013] Furthermore, it also includes a compression spring, which is arranged in the movable cavity of the fixing platform, one end of the compression spring is fixed, and the other end is against the conductive rod.

[0014] Furthermore, it also includes a scale plate, which is fixedly arranged on the bracket, and the extension lines of the scale lines of the scale plate converge at a point, which is the swing point of the tested needle a fixed on the fixed platform.

[0015] Furthermore, it also includes a first rocker arm, which is rotatably arranged on the bracket, and a pair of straight slots are provided on the first rocker arm, and the straight slots are located on both sides of the rotation center of the first rocker arm; a second rocker arm is hinged on the turntable, and one end of which is connected to the turntable through a compression spring; a first push rod, which is slidably arranged on the bracket, and one end of which is arranged in the straight slot of the first rocker arm through a pin shaft, and the other end is opposite to the second rocker arm; a second push rod, which is slidably arranged in the bracket, one end of which is arranged in the straight slot of the first rocker arm through a pin shaft, and the other end is opposite to the third push rod, and the first push rod and the second push rod are respectively correspondingly arranged on both sides of the rotation center of the first rocker rod; the third push rod, which is slidably arranged in the turntable, and one end of which is arranged in the straight slot of the second rocker arm through a pin shaft; a clamping block, which is fixedly arranged at the other end of the third push rod, and respectively drives the needle to swing back and forth with the toggle member.

[0016] The toggle member and the clamping block are respectively arranged on both sides of the needle.

[0017] The present application also discloses a needle testing method, comprising the following steps:

[0018] (1) Fix the tested needle a;

[0019] (2) Apply an arc force to the needle under test a to make the needle under test a swing;

[0020] (3) Remove the arc force and conduct a final angle measurement on the needle under test a.

[0021] Furthermore, in the step (1), an initial zero point is determined for the needle under test a.

[0022] Furthermore, in the step (2), a unidirectional arc force or a crosswise arc force is applied to the needle under test a.

[0023] The beneficial effects of the present invention are as follows: A professional tester is designed, which can accurately measure the needle under test, making the acting force for testing the needle always stable and the force simulation more accurate; the tester has multiple functions and can conduct resilience tests, bending fatigue tests, anti-bending fracture angle tests, and fracture tests. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the elastic bending fatigue test device of the present application;

[0025] Figure 2 is Figure 1 A sectional view taken along the line H-H in, where the first swing rod is at the position of point O;

[0026] Figure 3 is Figure 1 A sectional view taken along the line H-H in, where the first swing rod is at the position in the D1 direction;

[0027] Figure 4 is Figure 1 A sectional view taken along the line H-H in, where the first swing rod is at the position in the D direction.

[0028] In each of the above figures, 1. Support; 2. Fixed table;

[0029] 3. Rotating assembly; 31. Turntable; 32. Poking member;

[0030] 4. Conductive rod; 5. Compression spring; 6. Dial;

[0031] 71. First swing rod; 72. Second swing rod; 73. First push rod; 74. Second push rod; 75. Third push rod; 76. Clamping block; a. Needle under test. Detailed Embodiments

[0032] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features, and effects according to the present invention as follows:

[0033] A needle tester, such as Figures 1 to 4 As shown, it includes a bracket 1, a fixed platform 2 and a rotating component 3.

[0034] like Figure 1 As shown, a fixing platform 2 is arranged on a bracket 1, and the fixing platform 2 is used to fix the tested needle a. A rotating assembly 3 is arranged on the bracket 1, and when the rotating assembly 3 rotates, a swinging arc force is provided to the tested needle a. The arc force has the following effect: even if the tested needle a rotates under the action of the arc force, the point of action of the arc force on the tested needle a remains unchanged as much as possible.

[0035] Regarding the rotating component 3, the following scheme can be adopted. The rotating component 3 includes a turntable 31 and a toggle member 32. The turntable 31 is arranged on the bracket 1, and the turntable 31 can be driven by a servo motor or manually. Regarding the shape of the turntable 31, it can take a variety of forms, such as a circular shape, a rod shape or a fan shape. The toggle member 32 is fixedly arranged on the turntable 31, and the toggle member 32 acts on the tested needle a. Since the toggle member 32 needs to contact the tested needle a, the contact point of the toggle member 32, that is, the point of action that contacts the tested needle a, is set in an arc shape, so as to improve the contact effect of the toggle member 32 with the tested needle a during the rotation of the tested needle a.

[0036] The toggle member 32 and the clamping block 76 are respectively arranged 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.

[0037] First, the fixed platform 2 is provided with an intersecting fixed cavity and a movable cavity, which are arranged in a "T-shape". The fixed cavity is used to fix the tested needle a, and a conductive rod 4 is arranged in the movable cavity in the fixed platform 2. One end of the conductive rod 4 is fixedly connected to one end of the first wire, and the other end is facing the fixed cavity of the fixed platform 2. The toggle member 32 is a conductor, and one end of the toggle member 32 is fixedly connected to one end of the second wire, and the other end of the first wire and the other end of the second wire are respectively connected to the positive and negative poles of the power supply. The function here is that when the toggle member 32 contacts the tested needle a, a closed loop can be formed, which is convenient for accurately testing the bending angle of the tested needle a. On the basis of the above, a compression spring 5 is designed, and the compression spring 5 is arranged in the movable cavity of the fixed platform 2. One end of the compression spring 5 is fixed, and the other end is against the conductive rod 4 to ensure that the conductive rod 4 is always in contact with the tested needle a to form a closed electrical circuit. This scheme is used for electronic control measurement.

[0038] Second, a scale plate 6 is designed, which is fixed on a fixed seat, and the extension lines of the scale lines of the scale plate 6 converge at one point, which is the swing point of the tested needle a fixed on the fixed platform 2. This solution is used for manual measurement.

[0039] When performing fatigue fracture test on the tested needle a, it is necessary to control the rotating assembly 3 in both clockwise and counterclockwise directions. The present application provides the following design scheme.

[0040] like Figures 2 to 4 As shown, the first swing rod 71 is rotatably arranged on the bracket 1, and a pair of straight slots are arranged on the first swing rod 71, and the straight slots are located on both sides of the rotation center of the first swing rod 71, and the first swing rod 71 can swing between D and D1. The second swing rod 72 is hingedly arranged on the rotating disk 31, and one end of the second swing rod 72 is connected to the rotating disk 31 through a compression spring 5. Since a fixing sleeve is arranged on the outer side of the compression spring 5, when the compression spring 5 is placed upright, a force is applied to the second swing rod 72, and the second swing rod 72 is extremely easy to rotate. The first push rod 73 is slidably arranged on the bracket 1, and one end of the first push rod 73 is arranged in the straight slot 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 arranged in the bracket 1, and one end of the second push rod 74 is arranged in the straight slot of the first swing rod 71 through a pin shaft, and the other end of the second push rod 74 is opposite to the third push rod 75. The first push rod 73 and the second push rod 74 are respectively arranged on both sides of the rotation center of the first swing rod 71. When the first swing rod 71 is swung, the first push rod 73 and the second push rod 74 will move, and one of them will enter the rotating disk 31. Similar to the first push rod 73 and the second push rod 74, the third push rod 75 is slidably arranged in the rotating disk 31, and one end of the third push rod 75 is arranged in the straight slot of the second swing rod 72 through a pin. The clamping block 76 is fixedly arranged at the other end of the third push rod 75, and moves the needle a to swing back and forth with the toggle member 32.

[0041] A needle testing method comprises the following steps:

[0042] (1) Fix the tested pin a.

[0043] The tested needle a is fixed on the fixing table 2. At this time, its initial angle can be measured to enhance the credibility of the test result, that is, to determine the initial zero point.

[0044] (2) Apply arc force to the tested needle a to make the tested needle a swing.

[0045] The tested needle a rotates under the action of the arc force, and the point of action of the arc force on the tested needle a remains unchanged as much as possible. This action can be divided into two cases: one is to apply a unidirectional arc force to the tested needle a, so that the tested needle rotates in one direction. The other is to apply arc forces in different directions to the tested needle a, so that the tested needle swings back and forth.

[0046] (3) Remove the arc force and measure the final angle of the tested needle a.

[0047] The final state of the tested needle is measured, and the data of the final angle state is compared with the data of the initial angle state to obtain the required data.

[0048] 1. Rebound test of the tested needle a

[0049] Clamp the tested needle a in the fixed cavity of the fixed table 2, and set the bending angle distance, number of times and rotation speed through the touch screen connected to the electronic control device. Press the start button displayed on the touch screen, and the turntable 31 begins to rotate slowly clockwise. When the toggle member 32 touches the tested needle a, the low-voltage safety current is connected to the conductive rod 4 through the tested needle a to form an electrical circuit. At this time, the test system will default this point to the test "zero point" or "starting point". Repeat this action three times to confirm that the "zero point" is correct. If the three zero point values ​​exceed the allowable error, the test system will automatically stop the next test and display a text prompt on the display: Please confirm again whether the tested needle a is firmly fixed. Do you want to continue the test?

[0050] When the operator confirms that the tested needle a is firmly fixed, clicks the next step, and the turntable 31 rotates clockwise at the preset angle and distance to perform a resilience test. When performing the resilience test, the rotation speed of the turntable 31 is steady, slow and uniform. This action can be set to one or more times according to the test rules. When the tested needle a rotates to the set angular distance position, it is maintained for 3 seconds or more; when the test is completed according to the set requirements, the turntable 31 returns to a point above point A, and the toggle 32 leaves the tested needle a, that is, the current is disconnected; then the toggle 32 is slowly pressed down again. When the slow downward pressure contacts the tested needle a and conducts the current, the turntable 31 stops rotating and generates a value. The difference between this value and the previously confirmed zero point is the resilience index of the tested needle a.

[0051] 2. Anti-breaking angle test of the tested needle a

[0052] When the anti-breaking angle test is performed on the tested needle a, the toggle 32 first determines the "zero point" and the toggle 32 slowly moves in an arc. When the toggle 32 contacts the tested needle a, the current will be conducted, and this position is the "zero point". At this time, the toggle 32 continues to press down around the center point O1 until the tested needle a breaks and the current is interrupted, and the toggle 32 stops moving. The value generated at this time is the value of the anti-breaking angle of the tested needle a. It will also be stored and recorded by the instrument to give a linear graph and a data table.

[0053] 3. Bending fatigue fracture test of the tested needle a

[0054] When the tested needle a is subjected to bending fatigue fracture test, the toggle member 32 first confirms the accuracy of the "zero point", and then the servo motor drives the first swing rod 71, and the first push rod 73 and the second push rod 74 swing from "point O" to "point D" along with the center of the circle of the first swing rod 71. Under this action, the second push rod 74 moves forward to push the clamping block 76 out of the turntable 31, and under the action of the compression spring 5, the clamping block 76 will not easily move. After the clamping block 76 is pushed out, the first swing rod 71 returns to "point O" and the second push rod 74 retracts to its original position. When the clamping block 76 is pushed out and forms a "jaw" with the conductive voltage head, the tested needle a is clamped in the middle of the "jaw", and the "jaw" reciprocates with the "point O1" of the bending turntable as the center of the circle: it rotates clockwise to point C, and counterclockwise to point C1, and the tested needle a is repeatedly bent. Point C, point C1 and the number of bends are set according to the test rules. When the tested needle a breaks due to bending fatigue, the current between the toggle member 32 and the conductive rod 4 is disconnected, and the test is terminated. The bending angle, bending frequency, bending times and other data of the test are stored and recorded. At this time, the first swing rod 71 swings to the D1 position, driving the first push rod 73 to push forward, and the first push rod 73 pushes one end of the second swing rod 72 forward. The second swing rod 72 swings to the other side under the action of the compression spring 5. After the second swing rod 72 drives the third push rod 75 and the clamping block 76 to retract into the rotating disk 31, the first swing rod 71 returns to the "O position".

[0055] The tested needle a needs to be swung several times to break, so the servo motor is used to drive the turntable 31, which can reduce the testing time.

[0056] The present invention is described above with reference to the preferred embodiments, but the protection scope of the present invention is not limited thereto. Various improvements can be made to the embodiments and parts thereof can be replaced with equivalents without departing from the scope of the present invention. As long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way, and any figure mark in the claims should not be regarded as limiting the claims involved. No matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. Therefore, all technical solutions falling within the scope of the claims are within the protection scope of the present invention.

Claims

1. A needle tester, comprising a bracket (1), characterized in that, Also includes: A fixing platform (2), arranged on the support (1) and used for fixing the needle (a) to be tested; as well as A rotating assembly (3) is arranged on the support (1), and when the rotating assembly (3) rotates, it provides a swinging arc force for the tested needle (a); The rotating assembly (3) comprises: A rotating disk (31) is arranged on the support (1); as well as A toggle member (32) is fixedly arranged on the rotating disk (31) and acts on the tested needle (a); The fixed platform (2) is provided with a fixed cavity and a movable cavity intersecting each other, the fixed cavity is used to fix the tested needle (a), and a conductive rod (4) is provided in the movable cavity of the fixed platform (2); one end of the conductive rod (4) is fixedly connected to one end of the first wire, and the other end faces the fixed cavity of the fixed platform (2); the toggle member (32) is a conductor, one end of the toggle member (32) is fixedly connected to one end of the second wire, and the other end of the first wire and the other end of the second wire are respectively connected to the positive and negative electrodes of a power source; It also comprises a scale plate (6), which is fixedly arranged on the bracket (1), and the extension lines of the scale lines of the scale plate (6) converge at a point, which is the swing point of the tested needle (a) fixed on the fixing platform (2).

2. The needle tester according to claim 1, wherein It also comprises a compression spring (5), which is arranged in the movable cavity of the fixing platform (2), one end of the compression spring (5) is fixed, and the other end is against the conductive rod (4).

3. The pin tester according to claim 1, characterized in that, Also includes A first swing rod (71) is rotatably mounted on the bracket (1), wherein a pair of straight slots are provided on the first swing rod (71), and the straight slots are located on both sides of the rotation center of the first swing rod (71); A second swing rod (72) is hingedly arranged on the rotating disk (31), and one end of the second swing rod (72) is connected to the rotating disk (31) via a compression spring; A first push rod (73) is slidably disposed on the bracket (1), one end of which is disposed in the straight slot of the first swing rod (71) via a pin, and the other end of which is opposite to the second swing rod (72); A second push rod (74) is slidably disposed in the bracket (1), one end of which is disposed in the straight slot of the first swing rod (71) through a pin, and the other end is opposite to the third push rod (75), and the first push rod (73) and the second push rod (74) are respectively disposed on both sides of the rotation center of the first swing rod (71); A third push rod (75) is slidably disposed in the rotating disk (31), one end of which is disposed in the straight slot of the second swing rod (72) through a pin; The clamping block (76) is fixedly arranged on the other end of the third push rod (75), and together with the shifting member (32) respectively shifts the needle (a) to swing back and forth.

4. The needle tester according to claim 3, characterized in that, The toggle member (32) and the clamping block (76) are respectively arranged on both sides of the needle (a).

5. A method for performing a pin test using the pin tester according to any one of the above claims, characterized in that, The following steps are involved: (1) Fix the tested needle a; (2) Apply arc force to the tested needle a to make the tested needle a swing; (3) Remove the arc force and measure the final angle of the tested needle a.

6. The method of pin testing according to claim 5, wherein, In the step (1), the initial zero point of the tested needle a is determined.

7. The method of pin testing according to claim 5, wherein In the said step (2), a unidirectional arc force or a crosswise staggered arc force is applied to the test needle a.

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