Magnetic powder detection tool for tension spring

Abstract

The invention relates to the technical field of aeronautical manufacturing, and discloses a magnetic powder detection tool for a tension spring, which comprises a stretching base, a stretching rod and a locking sleeve, and is characterized in that the tension spring is stretched by adjusting the relative distance of the stretching base, so that each circle of structure of the tension spring is fully separated; then the relative positions of the two stretching bases are fixed through limiting blocks, then the two ends of a tension spring are clamped between two electrodes of the magnetic particle flaw detector, and current passes through the tension spring to complete circumferential magnetization; then a conductor is inserted into the tension spring to complete longitudinal magnetization; after magnetization is completed, circumferential demagnetization is directly used, and tension spring magnetic powder detection operation is completed. According to the device, circumferential and longitudinal magnetic powder detection and demagnetization operation can be completed in sequence, the detection efficiency is high, the tension amount of the tension spring can be fixed, the stability in the overall circumferential magnetization clamping and magnetization operation process of the tension spring is guaranteed, and the working efficiency is improved. And the problems of magnetic writing generated by circumferential magnetization, non-uniform current, difficulty in eliminating residual magnetism by longitudinal magnetization and the like in the tension spring magnetic powder detection operation are solved.

Description

Technical Field

[0001] This invention relates to the field of aerospace manufacturing technology and discloses a magnetic particle inspection fixture for tension springs. Background Technology

[0002] Springs play a crucial role as key components in manufacturing. However, during manufacturing and use, springs may develop cracks or other damage due to material defects or stress concentration, which can lead to equipment malfunctions or even failure. Therefore, non-destructive testing of springs is essential to ensure their quality and reliability.

[0003] However, for tension springs, magnetic particle testing has the following problems: 1. In circumferential magnetization, each coil of the tension spring is prone to magnetic writing (false display); 2. In circumferential magnetization, the tension spring is equivalent to an inductor connected in series in the circuit. Due to the effect of the inductance, its actual magnetization current is lower than the set value. Its internal current and magnetic field are uncontrollable, resulting in unsatisfactory detection results. 3. During longitudinal magnetization, the tension spring will generate residual magnetism that is difficult to eliminate. Even with repeated magnetization and demagnetization, it is difficult to avoid the impact of the assembled parts on the instruments and meters. 4. Traditional magnetic particle testing methods require separate steps for circumferential and longitudinal inspections, resulting in low efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic particle testing fixture for tension springs, which can fix the tension of the tension spring, ensure the stability of the tension spring during the overall circumferential magnetization clamping and magnetization process, and avoid problems such as magnetic writing and uneven current during circumferential magnetization and difficulty in eliminating residual magnetism during longitudinal magnetization in tension spring magnetic particle testing.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows: A magnetic particle testing fixture for tension springs includes: Two tension bases, each of which has a through hole, and the two through holes are arranged opposite to each other; At least two tension rods are provided, and the tension rods are supported between two tension bases. There are two locking sleeves, each inserted into a through hole of one of the tension bases. The ends of the two locking sleeves located between the two through holes are fixedly connected to the two mounting joints of the tension spring. Each locking sleeve has a limiting block with a width greater than the maximum radial dimension of the through hole at the end away from the mounting joint. The opposite ends of the two locking sleeves are electrically connected to the electrodes.

[0006] Furthermore, the amount of tension of the spring between the two tension bases The value range is , wherein is the effective number of turns of the tension spring between the two tension bases, is the wire diameter of the tension spring, is the minimum allowable gap between adjacent turns of the tension spring, is 3-5 mm, is the shear modulus of the tension spring material, is the curvature coefficient of the tension spring, is the mean diameter of the tension spring, is the allowable shear stress of the tension spring material.

[0007] Further, the through hole is provided with an insulating bushing at a position in contact with the corresponding locking sleeve.

[0008] Further, each of the tension rods is provided with an adjusting and limiting assembly for adjusting the distance between the two tension bases.

[0009] Further, the limiting assembly is an adjusting nut sleeved on the tension rod, and the tension rod is provided with a thread matched with the adjusting nut.

[0010] Further, the limiting assembly is a limiting pin inserted into the tension rod, and the limiting pin extends radially out of the outer wall of the tension rod for abutting and matching with the edge of the through hole.

[0011] Further, each of the tension bases is provided with a guide cylinder axially parallel to the tension spring, and the tension rod is inserted into the guide cylinders of the two tension bases.

[0012] Further, the tension rod is provided with a scale ruler indicating the elongation of the tension spring.

[0013] Compared with the prior art, the present application has the beneficial effects that the present application can sequentially complete circumferential, longitudinal magnetic powder detection and demagnetization operations, not only has high detection efficiency, but also can fix the tension of the tension spring, ensure the stability of the whole circumferential magnetization clamping and magnetization operation process of the tension spring, and avoid the problems of magnetic writing, uneven current and difficulty in eliminating residual magnetism in the circumferential magnetization of the tension spring magnetic powder detection operation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic structural diagram of a magnetic powder detection tool for a tension spring in an embodiment; Figure 2 is a schematic diagram of the connection relationship between the locking sleeve and the tension spring in an embodiment; Figure 3 is a structural schematic diagram of the tension base in an embodiment; Wherein, 1, the stretching base; 2, the through hole; 3, the stretching rod; 4, the locking sleeve; 5, the limiting block; 6, the insulating bushing; 7, the adjusting nut; 8, the guide cylinder; 9, the tension spring. DETAILED DESCRIPTION

[0015] The application will be further described below in conjunction with the embodiments and drawings. However, it should not be understood that the above-mentioned subject matter of the application is limited to the following embodiments only, and any technology realized based on the content of the application falls within the scope of the application.

[0016] EMBODIMENT Referring to Figure 1 , Figure 2 and Figure 3 , a magnetic powder detection tool for tension spring comprises: two stretching bases 1, each of which is provided with a through hole 2, and the two through holes 2 are oppositely arranged; stretching rods 3, the number of which is at least two, and the stretching rods 3 are supported between the two stretching bases 1; locking sleeves 4, the number of which is two, and the two locking sleeves 4 are respectively inserted into the through hole 2 of one of the stretching bases 1, the ends of the two locking sleeves 4 between the two through holes 2 are respectively fixedly connected with two mounting connectors of the tension spring 9, and each of the locking sleeves 4 is provided with a limiting block 5 at an end away from the mounting connector, the width of the limiting block 5 is greater than the maximum radial dimension of the through hole 2, and the opposite ends of the two locking sleeves 4 are respectively electrically connected with electrodes.

[0017] In the embodiment, in order to avoid the formation of magnetic writing in the circumferential detection of the tension spring 9, the relative distance between the stretching bases 1 is adjusted before the magnetic powder detection of the tension spring 9, the tension spring 9 is stretched, and the structure of each circle of the tension spring 9 is fully separated; then the relative positions of the two stretching bases 1 are fixed by the limiting block 5, and then the two ends of the tension spring 9 are clamped between the two electrodes of the magnetic powder detector, and the current passes through the tension spring 9 to complete the circumferential magnetization; then a conductor is inserted into the tension spring 9 to complete the longitudinal magnetization; after magnetization, circumferential demagnetization is directly used to complete the magnetic powder detection of the tension spring 9. The magnetic powder detection tool for tension spring 9 of the embodiment can sequentially complete the circumferential, longitudinal magnetic powder detection and demagnetization operation, not only has high detection efficiency, but also can fix the stretching amount of the tension spring 9, ensure the stability of the tension spring 9 in the whole circumferential magnetization clamping and magnetization operation process, and avoid the problems of magnetic writing, uneven current and difficult to eliminate residual magnetism in the circumferential magnetization of the tension spring 9 in the magnetic powder detection operation of the tension spring 9.

[0018] In the embodiment, the stretching amount of the tension spring 9 between the two stretching bases 1 is in the range of , wherein is the effective number of circles of the tension spring 9 between the two stretching bases 1. The wire diameter of tension spring 9, This is the minimum permissible clearance between adjacent coils of tension spring 9. The value is 3-5mm. Shear modulus of tension spring 9 material Curvature coefficient of tension spring 9 The mean diameter of tension spring 9, This represents the allowable shear stress of the tension spring material 9. The tensile amount in this embodiment... The range comprehensively considers the minimum gap of the wire coil to effectively block magnetic short circuits and provide a field of view for magnetic particle detection, as well as the safety limit of the tension spring 9 under permissible shear stress, thereby limiting the tension of the tension spring 9. By setting the tension spring 9 within a reasonable range, it is ensured that it will not be damaged due to excessive stretching during the testing process, while also effectively preventing magnetic short circuits. This allows the magnetic powder to be distributed more evenly on the surface of the spring, improving the accuracy and reliability of the test. In practical applications, the appropriate stretching amount can be calculated simply by substituting the specific parameters of the spring 9, such as the effective number of coils, wire diameter, and mean diameter, into the above formula. This allows for precise control of the position of the limit block 5 to adjust the length of the tension rod 3, thereby greatly simplifying the testing process and improving testing efficiency.

[0019] In this embodiment, the scale marking the elongation of the tension spring 9 on the tension rod 3 can be used to assist in confirming the elongation of the tension spring 9 and ensure that the elongation is within the design requirements.

[0020] In this embodiment, an insulating bushing 6 is provided at the contact position between the through hole 2 and the corresponding locking sleeve 4 to insulate the tension spring 9 from the tension base 1, thereby avoiding the problem of uneven internal current and unsatisfactory magnetization effect during circumferential magnetization.

[0021] In this embodiment, each tension rod 3 is provided with an adjustment limit component, which is used to adjust the distance between the two tension bases 1. This can realize the adjustment of the tension spring 9, ensure that the pitch in the tension spring 9 is set reasonably, and further avoid the problems of magnetic writing and uneven current caused by circumferential magnetization during the magnetic particle detection operation of the tension spring 9.

[0022] In this embodiment, the limiting component is an adjusting nut 7 sleeved on the tension rod 3. The tension rod 3 is provided with a thread that mates with the adjusting nut 7. By rotating the adjusting nut 7, the relative movement distance between the two tension bases 1 can be precisely controlled, thereby achieving fine adjustment and limiting of the tension of the tension spring 9. The operation is simple and can be continuously adjusted with high precision, which can meet the detection requirements of tension springs 9 of different specifications, further improving the versatility and flexibility of the magnetic particle detection fixture.

[0023] In some other embodiments, the limiting component is a limiting pin inserted on the stretching rod 3, which extends radially out of the outer wall of the stretching rod 3 and is used to abut against the edge of the through hole 2. By replacing limiting pins of different lengths or adjusting the insertion position of the limiting pin on the stretching rod 3, the distance between the first stretching base 1 and the second stretching base 1 can be flexibly adjusted, and thus the effective control of the stretching amount of the tension spring 9 can be realized.

[0024] In the present embodiment, each of the stretching bases 1 is provided with a guide cylinder 8 parallel to the axis of the tension spring 9, and the stretching rod 3 is inserted into the guide cylinders 8 of the two stretching bases 1. The guide cylinder 8 plays a guiding and supporting role for the stretching rod 3, and ensures that the stretching base 1 is always parallel to the axis of the tension spring 9 during the distance adjustment process and after being adjusted to the preset position, thereby avoiding the problem that the uneven stretching of the tension spring 9 due to the deviation of the stretching rod 3 affects the accuracy of the magnetic powder detection, and effectively improving the overall performance of the magnetic powder detection tool.

[0025] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic particle testing fixture for tension springs, characterized in that, include: Two tension bases (1), each tension base (1) is provided with a through hole (2), and the two through holes (2) are arranged opposite to each other; At least two tension rods (3) are provided, and the tension rods (3) are supported between two tension bases (1); There are two locking sleeves (4). The two locking sleeves (4) are respectively inserted into the through hole (2) of one of the tension bases (1). The ends of the two locking sleeves (4) located between the two through holes (2) are respectively fixedly connected to the two mounting joints of the tension spring (9). Each locking sleeve (4) has a limiting block (5) with a width greater than the maximum radial dimension of the through hole (2) at the end away from the mounting joint. The opposite ends of the two locking sleeves (4) are respectively electrically connected to the electrodes.

2. The magnetic particle testing fixture for tension springs according to claim 1, characterized in that, The tension of the tension spring (9) between the two tension bases (1) The range of values ​​is ,in The effective number of turns of the tension spring (9) between the two tension bases (1) The wire diameter of the tension spring (9) is... The minimum allowable gap between adjacent coils of the tension spring (9) The value is 3-5mm. Shear modulus of tension spring (9) material, The curvature coefficient of the tension spring (9), The mean diameter of the tension spring (9) The allowable shear stress of the tension spring (9) material.

3. The magnetic particle testing fixture for tension springs according to claim 1, characterized in that, An insulating bushing (6) is provided at the contact position between the through hole (2) and the corresponding locking sleeve (4).

4. The magnetic particle testing fixture for tension springs according to claim 1, characterized in that, Each of the tension rods (3) is provided with an adjustment limit component for adjusting the distance between the two tension bases (1).

5. The magnetic particle testing fixture for tension springs according to claim 4, characterized in that, The limiting component is an adjusting nut (7) sleeved on the tension rod (3), and the tension rod (3) is provided with a thread that mates with the adjusting nut (7).

6. The magnetic particle testing fixture for tension springs according to claim 4, characterized in that, The limiting component is a limiting pin inserted on the tension rod (3). The limiting pin extends radially out of the outer wall of the tension rod (3) and is used to abut against the edge of the through hole (2).

7. The magnetic particle testing fixture for tension springs according to claim 1, characterized in that, Each of the tension bases (1) is provided with a guide cylinder (8) parallel to the axial direction of the tension spring (9), and the tension rod (3) is inserted into the guide cylinder (8) of the two tension bases (1).

8. The magnetic particle testing fixture for tension springs according to claim 1, characterized in that, The tension rod (3) is provided with a scale indicating the elongation of the tension spring (9).

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