Mutual inductor magnetic core stress detection device

Abstract

The utility model discloses a mutual inductor magnetic core stress detection device, which relates to the technical field of instrument detection devices, and comprises a base used for placing a magnetic core to be detected; the adjusting plate is parallel to the base, a pressure air cylinder is arranged on the adjusting plate in a penetrating mode, the feeding direction of the pressure air cylinder is perpendicular to the base, and the end, close to the base, of the pressure air cylinder is connected with a pressure block through a first pressure spring; the mutual inductor magnetic core stress detection device comprises a base, a pressure block and a test probe, the pressure block is arranged on the base, the test probe penetrates through the pressure block, one end, close to the base, of the test probe can be electrically communicated with a magnetic core to be detected, and the test probe and the magnetic core to be detected are electrically connected with an inductance tester. The inductance value of the magnetic core is reduced, the precision of the mutual inductor is reduced, and the rejection rate of products is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to instrument detection device technical field, especially inter -sensor magnetic core stress detection device. BACKGROUND

[0002] The inter -sensor has the magnetic core and the coil that winds on the magnetic core periphery is composed, at present, when testing the inductance variation of the magnetic core, the energized wire is connected at the both ends of the magnetic core directly, but in the actual production, the sensitivity of different batches of inter -sensor often appears the big deviation, and it is easy to appear a large number of defective products, after disassembling the defective product, the coil that winds on the magnetic core periphery will produce stress to the magnetic core, the stress will lead to the inductance of the magnetic core drop, and different magnetic cores are influenced differently by stress, the same batch of magnetic cores wind the same coil, and the precision of the inter -sensor produced exists the big difference, seriously influence the quality of product.

[0003] In summary, developing an inter -sensor magnetic core stress detection device that tests the degree of inductance change after the magnetic core is affected by stress is a problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of inter -sensor magnetic core stress detection devices, solve the technical problems that the coil in the periphery of magnetic core is arranged in the processing process, to the magnetic core produces pressure, lead to the inductance of the magnetic core drop, inter -sensor precision drop.

[0005] To achieve the above object, the utility model provides a kind of inter -sensor magnetic core stress detection device, comprising:

[0006] Base, base is used to place the magnetic core to be measured;

[0007] Adjusting plate, adjusting plate is parallel with base, pressure cylinder is penetrated on adjusting plate, pressure cylinder feed direction is perpendicular to base, pressure cylinder is connected with pressure block by first pressure spring at one end close to base;

[0008] Test probe, test probe is penetrated on pressure block, one end of test probe close to base can be electrically communicated with the magnetic core to be measured, test probe and the magnetic core to be measured are electrically connected with inductance tester.

[0009] Preferably, base side is equipped with adjusting rod, adjusting rod is perpendicular to base, adjusting block is slidably equipped on adjusting rod, and adjusting block can be fastened to any position of adjusting rod.

[0010] Preferably, connecting hole is equipped on the end surface of the magnetic core to be measured, test probe is inserted into connecting hole and is attached to connecting hole side wall, probe can slide inside pressure block, second pressure spring is equipped between the end surface of the side close to base of pressure block and test probe.

[0011] Preferably, the test probe extends into the first pressure spring from the side away from the base, and a first lead wire is connected to the end of the test probe.

[0012] Preferably, a limiting block is arranged on the base, a positioning groove is arranged on the side wall of the limiting block away from the adjusting rod, the positioning groove is used for abutting against the measured magnetic core to determine the position of the measured magnetic core, a positioning hole is arranged on the end face of the limiting block parallel to the base, a fixing member is arranged between the positioning hole and the base, and the position of the fixing member is adjusted so that the measured magnetic core abutting against the positioning groove corresponds to the pressure probe.

[0013] Preferably, a wiring groove is arranged on the base, a second lead wire is arranged in the wiring groove, one end of the second lead wire is connected to the measured magnetic core, and the second lead wire and one end of the first lead wire are electrically connected to the inductance tester.

[0014] Preferably, the elastic coefficient of the first pressure spring is much greater than the elastic coefficient of the second pressure spring.

[0015] Preferably, the base and the adjusting plate are each provided with a clamping portion, the adjusting rod is arranged through the clamping portion, a fastening member is arranged in each clamping portion, and the clamping portion is clamped and fixed on the adjusting rod by screwing the fastening member.

[0016] Preferably, a friction texture is arranged on the end face of the test probe corresponding to the connecting hole, and the friction texture avoids deviation of the test probe.

[0017] With respect to the above background art, the mutual inductor magnetic core stress detection device provided by the utility model includes: a base, the base is used for placing a to-be-tested magnetic core, an adjusting plate parallel to the base is arranged above the base, a pressure cylinder is arranged on the end face of the adjusting plate, the pressure cylinder is fixedly connected with the adjusting plate, one end of the pressure cylinder close to the base can be extended, the extension direction of the pressure cylinder is perpendicular to the base, a first pressure spring is further connected to the end of the pressure cylinder close to the base, and the end of the first pressure spring is connected with a pressure block. When the pressure change of the to-be-tested magnetic core is tested, the pressure cylinder is started to drive the first pressure spring and the pressure block to move close to the base. When the to-be-tested magnetic core is abutted against the pressure block after moving a distance, the pressure block stops moving, the pressure cylinder pushes one end of the first pressure spring to compress the first pressure spring, the first pressure spring abuts against the pressure block, and the pressure block generates pressure on the to-be-tested magnetic core, thereby simulating the stress condition of the to-be-tested magnetic core after winding a coil. Further, a test probe is arranged on the pressure block, the test probe is in electrical communication with the to-be-tested magnetic core when the pressure block abuts against the to-be-tested magnetic core, the to-be-tested magnetic core and the test probe are respectively electrically connected with an inductance tester, the inductance tester can detect the inductance change of the to-be-tested magnetic core, and the inductance tester tests the change of the to-be-tested magnetic core under the influence of pressure. If the to-be-tested magnetic core has a small pressure change, it is confirmed as a good product, and if the to-be-tested magnetic core has a large change, it is marked as a defective product. The mutual inductor magnetic core stress detection device can detect and screen product components, thereby improving the qualified rate of products. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, a brief introduction will be given below to the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only embodiments of the present utility model, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the provided drawings.

[0019] Figure 1 A structure diagram of the mutual inductor magnetic core stress detection device provided by the embodiments of the present utility model;

[0020] Figure 2 A structure diagram of the base provided by the embodiments of the present utility model.

[0021] Among them, 1-base;2-adjusting plate;21-clamping part;3-pressure cylinder;4-pressure block;5-first pressure spring;6-second pressure spring;7-test probe;8-adjusting rod;9-to-be-tested magnetic core;91-connection hole;10-limiting block;101-positioning hole;102-fixing part;11-first wire;12-second wire;13-wiring groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0023] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0024] The present application provides a mutual inductor magnetic core stress detection device, which comprises a base 1 for bearing a to-be-tested magnetic core 9, an adjusting plate 2 parallel to the base 1 is arranged above the base 1, a pressure cylinder 3 is arranged through the adjusting plate 2, and the pressure cylinder 3 is fixedly connected to the adjusting plate 2. In addition, the pressure cylinder 3 is arranged parallel to the adjusting plate 2, the pressure cylinder 3 can feed towards the side close to the base 1, a first pressure spring 5 is arranged on the pressure cylinder 3, and the first pressure spring 5 is coaxially arranged with the pressure cylinder 3. A pressure block 4 is connected to the end of the first pressure spring 5 away from the pressure cylinder 3. When simulating the pressure environment of the to-be-tested magnetic core 9, the pressure cylinder 3 is operated, the pressure cylinder 3 drives the first pressure spring 5 to move towards the side close to the base 1. After moving a distance, the pressure block 4 arranged at the end of the first pressure spring 5 abuts against the to-be-tested magnetic core 9. At this time, the pressure block 4 stops moving, the pressure cylinder 3 further extends to compress the first pressure spring 5, and the first pressure spring 5 applies an elastic force to the pressure block 4, thereby simulating the situation that the to-be-tested magnetic core 9 is subjected to the pressure of the wound coil. Further, a test probe 7 is also arranged through the pressure block 4, the test probe 7 moves together with the pressure block 4. When the pressure block 4 abuts against the to-be-tested magnetic core 9, the test probe 7 contacts the to-be-tested magnetic core 9. The test probe 7 and the to-be-tested magnetic core 9 are both electrically connected to an inductance tester (not shown in the figure). That is, when the pressure cylinder 3 drives the pressure block 4 to abut against the to-be-tested magnetic core 9, an electric circuit is formed among the inductance tester, the test probe 7 and the to-be-tested magnetic core 9. The inductance tester outputs a current through the to-be-tested magnetic core 9 to detect the inductance of the to-be-tested magnetic core 9.

[0025] In one embodiment of the present application, the to-be-tested magnetic core 9 is placed on the base 1, the pressure cylinder 3 is started to drive the pressure block 4 to move, when the pressure block 4 just abuts against the to-be-tested magnetic core 9, the test probe 7 arranged on the pressure block 4 contacts the to-be-tested magnetic core 9, an electric circuit is formed among the inductance tester, the test probe 7 and the to-be-tested magnetic core 9, the inductance of the to-be-tested magnetic core 9 at this time is recorded, further, the pressure cylinder 3 is continuously driven to move, the pressure cylinder 3 drives the first pressure spring 5 to compress, the first pressure spring 5 applies pressure to the to-be-tested magnetic core 9 through the pressure block 4, at this time, the change of the measured value of the inductance tester is observed, when the changed inductance is within the error range, the to-be-tested magnetic core 9 is marked as a qualified product, if the changed inductance is beyond the error range, the to-be-tested magnetic core 9 is eliminated, the mutual inductor magnetic core stress detection device screens the to-be-tested magnetic core 9 through detection, and the qualified rate of the produced mutual inductor is improved.

[0026] Please refer to the drawings in the description Figure 1 With the drawings Figure 2 The adjusting plate 2 and one end of the base 1 are both provided with a clamping portion 21, an adjusting rod 8 is arranged in the clamping portion 21, the adjusting plate 2, the base 1 and the adjusting rod 8 are perpendicular, in addition, the base 1 and the adjusting plate 2 are slidably arranged on the adjusting rod 8, a fastener is arranged at one end of the clamping portion 21, the fastener is threadedly connected in the clamping portion 21, when the clamping portion 21 is sleeved on the adjusting rod 8, the fastener is screwed to clamp the adjusting rod 8, and the adjusting plate 2 is fixed at a suitable height.

[0027] In an embodiment of the present application, the pressure of the coil wound around the measured magnetic core 9 on the measured magnetic core 9 is measured in advance, and the length required for the compression of the first pressure spring 5 is calculated by F=k·s, the distance between the base 1 and the adjusting plate 2 is denoted as h, and the maximum feeding distance of the pressure cylinder 3 is denoted as l, wherein F is the pressure of the coil wound around the measured magnetic core 9 on the measured magnetic core 9, k is the elastic coefficient of the first pressure spring 5, and s is the compression amount of the first pressure spring 5. The distance between the base 1 and the adjusting plate 2 is adjusted to satisfy l=s+h, i.e., when the feeding amount of the pressure cylinder 3 reaches the maximum value, the compression amount of the spring is just the pre-calculated s, so that the pressure received by the measured magnetic core 9 reaches the preset pressure, which facilitates the subsequent detection and screening work. However, in another embodiment of the present application, the feeding distance of the pressure cylinder 3 is limited, and in the case of detecting some small measured magnetic cores 9 or in the case of a large preset pressure requiring a large compression amount of the first pressure spring 5, even if the pressure cylinder 3 reaches the maximum feeding amount, the first pressure spring 5 still cannot reach the target compression amount. At this time, the fastener of the clamping part 21 is screwed to make the adjusting plate 2 and the base 1 slide on the adjusting rod 8. At this time, the base 1 or the adjusting plate 2 is slid to adjust the distance between the base 1 and the adjusting plate 2 to satisfy l=s+h, so that when the pressure cylinder 3 reaches the maximum feeding amount, the pressure of the first pressure spring 5 on the measured magnetic core 9 just reaches the preset value. The base 1 and the adjusting plate 2 provided with the clamping part 21 improve the applicability of the transformer magnetic core stress detection device.

[0028] Preferably, a connecting hole 91 is arranged on the end face of the to-be-tested magnetic core 9 parallel to the adjusting plate 2, the connecting hole 91 is matched with the test probe 7, that is, when the pressure block 4 abuts against the end face of the to-be-tested magnetic core 9, the test probe 7 extends into the connecting hole 91, and the test probe 7 is attached to the side wall of the connecting hole 91, so that a communication loop is formed among the test probe 7, the to-be-tested magnetic core 9 and the inductance tester, further, the test probe 7 can slide through the pressure block 4, and the test probe 7 is coaxial with the pressure block 4, a second pressure spring 6 is arranged on the side end face of the pressure block 4 close to the base 1, the two ends of the second pressure spring 6 are connected with the pressure block 4 and the test probe 7 respectively, when the test probe 7 slides away from the base 1, the second pressure spring 6 is compressed, in an embodiment of the present application, when the height of the to-be-tested magnetic core is small, the length of the test probe 7 is greater than the depth of the connecting hole 91 of the to-be-tested magnetic core 9, that is, after the test probe 7 extends into the connecting hole 91 and the end of the test probe 7 abuts against the base 1, the pressure plate has not abutted against the to-be-tested magnetic core 9, at this time, the pressure cylinder 3 continues to push the first pressure spring 5, so that the relative sliding between the pressure block 4 and the test probe 7 occurs, at this time, the test probe 7 abuts against the base 1, the pressure block 4 continues to approach the to-be-tested magnetic core 9, until the pressure block 4 abuts against the to-be-tested magnetic core 9, preferably, the elastic coefficient of the second pressure spring 6 is far less than the elastic coefficient of the first pressure spring 5, that is, when the first pressure spring 5 and the second pressure spring 6 are compressed, and the elastic forces applied to the pressure block 4 by the first pressure spring 5 and the second pressure spring 6 are opposite, but the pressure applied to the pressure block 4 by the second pressure spring 6 is far less than the pressure applied to the pressure block 4 by the first pressure spring 5, so that the pressure applied to the to-be-tested magnetic core 9 is the same as the preset value, after the mutual inductor magnetic core stress detection device completes the test on the to-be-tested magnetic core 9, the second pressure spring 6 pushes the test probe 7, so that the test probe 7 returns to the original position, and the test probe 7 can fully extend into the to-be-tested magnetic core 9 when the to-be-tested magnetic core of other sizes is tested, so that the current can stably pass through the to-be-tested magnetic core 9, and the inductance value tested is accurate.

[0029] Preferably, the test probe 7 extends through the pressure block 4, the side of the test probe 7 away from the base 1 extends into the first pressure spring 5, and the first pressure spring 5 is connected with the first lead wire 11, and the first lead wire 11 extends to the outside of the first pressure spring 5 and is electrically connected with the inductance tester, similarly, the second lead wire 12 is connected on the to-be-tested magnetic core 9, and the second lead wire 12 is electrically connected with the inductance tester, further, the base 1 is provided with a wiring groove 13, and the second lead wire 12 is arranged in the wiring groove 13, so that the second lead wire 12 is not extruded on the end face of the base 1 by the to-be-tested magnetic core, and the second lead wire 12 is not damaged, and at the same time, the to-be-tested magnetic core 9 is balanced in force, and the inductance value tested is more accurate.

[0030] Please refer to the drawings in the description Figure 2The limiting block 10 is provided with a positioning groove on the end face away from the adjusting rod 8, preferably, the positioning groove can be V-shaped, the limiting groove is in abutment with the side wall of the to-be-tested magnetic core 9, the position of the to-be-tested magnetic core 9 on the base 1 is determined, the connecting hole 91 of the to-be-tested magnetic core 9 corresponds to the test probe 7, the limiting block 10 is provided with a positioning hole 101 on the end face parallel to the base 1, and a fixing piece 102 is detachably arranged in the positioning hole 101, the fixing piece 102 fixes the positioning piece on the base 1, when the to-be-tested magnetic core of different sizes is replaced, the fixing piece 102 is removed, the position of the limiting block 10 on the base 1 is adjusted, and the to-be-tested magnetic core abutted by the limiting block 10 can be matched with the test probe 7, and the limiting block 10 of adjustable position further improves the applicability of the mutual inductor magnetic core stress detection device.

[0031] Preferably, the test probe 7 is provided with a friction texture on the end face close to the base 1, when the test probe 7 is inserted into the connecting hole 91 of the to-be-tested magnetic core 9, the end of the test probe 7 can be in abutment with the base 1, that is, the friction texture of the test probe 7 is attached to the end face of the base 1, the second pressure spring 6 exerts pressure on the test probe 7, when the pressure cylinder 3 exerts pressure on the pressure block 4, the end of the test probe 7 is subjected to the friction force generated by the friction texture, the test probe 7 is ensured to be stably arranged, and the inductance accurately detected is ensured.

[0032] In one embodiment of the present application, the weight of the outer peripheral coil of the to-be-tested magnetic core 9 is measured, the pressure applied by the coil to the to-be-tested magnetic core 9 is calculated, the target compression amount of the first pressure spring 5 is calculated through the formula F=k*s, the distance between the base 1 and the adjusting plate 2 is further adjusted, the distance relationship between the base 1 and the adjusting plate 2 satisfies l=s+h, then the position of the limiting block 10 is adjusted, the test probe 7 can be inserted into the connecting hole 91 of the to-be-tested magnetic core 9 after the to-be-tested magnetic core 9 is clamped on the positioning groove, after the to-be-tested magnetic core 9 is positioned, the pressure cylinder 3 is started, the pressure cylinder 3 drives the first pressure spring 5 and the pressure block 4 to move towards the side close to the to-be-tested magnetic core 9, after a distance, the test probe 7 is inserted into the connecting hole 91, the pressure block 4 is in abutment with the end face of the to-be-tested magnetic core 9, at this time, the test probe 7, the to-be-tested magnetic core 9 and the inductance tester form a communication loop through the first wire 11 and the second wire 12, the inductance tester is started to detect the inductance of the to-be-tested magnetic core 9 at this time, when the pressure cylinder 3 reaches the maximum feed amount, the pressure applied to the to-be-tested magnetic core 9 reaches the preset pressure value, the inductance of the to-be-tested magnetic core at this time is tested through the inductance tester, the inductance detected twice is compared and the difference is calculated, whether the difference exceeds the error range is observed, and the defective products are screened out according to the difference.

[0033] It should be noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0034] The principles and implementation modes of the present application are described herein by using specific examples. The above examples are only used to help understand the method and core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A device for detecting stress in the magnetic core of a current transformer, characterized in that, Include: Base (1) for placing the measured magnetic core (9); Adjusting plate (2) parallel to the base (1), the adjusting plate (2) is provided with pressure cylinder (3), the pressure cylinder (3) feeding direction is perpendicular to the base (1), the pressure cylinder (3) is connected with pressure block (4) through first pressure spring (5) near one end of the base (1); Test probe (7) is provided on the pressure block (4), the test probe (7) is close to one end of the base (1) and can be electrically connected with the measured magnetic core (9), the test probe (7) and the measured magnetic core (9) are electrically connected with the inductance tester.

2. The transformer core stress detection apparatus according to claim 1, characterized by, The base (1) is provided with adjusting rod (8) on one side, the adjusting rod (8) is perpendicular to the base (1), the adjusting rod (8) is slidably provided with the adjusting plate (2), and the adjusting plate (2) can be fixed on the adjusting rod (8) at any position.

3. The transformer core stress detection apparatus according to claim 2, characterized by The end face of the measured magnetic core (9) is provided with a connecting hole (91), the test probe (7) extends into the connecting hole (91) and is attached to the side wall of the connecting hole (91), the test probe (7) can slide in the pressure block (4), and the second pressure spring (6) is arranged between the end face of the pressure block (4) close to the base (1) and the test probe (7).

4. The transformer core stress detection apparatus according to claim 3, characterized by The test probe (7) extends into the first pressure spring (5) away from the base (1), and the test probe (7) is connected with the first wire (11).

5. The transformer core stress detection apparatus according to claim 4, characterized by The base (1) is provided with a limiting block (10), the limiting block (10) is provided with a positioning groove on the side wall away from the adjusting rod (8), the positioning groove is used for abutting against the measured magnetic core (9) to determine the position of the measured magnetic core (9), the limiting block (10) is provided with a positioning hole (101) on the end face parallel to the base (1), and a fixing piece (102) is provided between the positioning hole (101) and the base (1), the position of the fixing piece (102) is adjusted, so that the measured magnetic core (9) abutting against the positioning groove corresponds to the test probe (7).

6. The transformer core stress detection apparatus according to claim 5, characterized by The base (1) is provided with a wiring groove (13), the wiring groove (13) is provided with a second wire (12), one end of the second wire (12) is connected with the measured magnetic core (9), and the second wire (12) and one end of the first wire (11) are respectively electrically connected with the inductance tester.

7. The transformer core stress detection apparatus according to claim 3, characterized by The elastic coefficient of the first pressure spring (5) is much larger than that of the second pressure spring (6).

8. The transformer core stress detection apparatus according to claim 7, characterized by The base (1) and the adjusting plate (2) are provided with clamping portions (21), the adjusting rod (8) is provided on the clamping portions (21), a fastener is provided in each clamping portion (21), and the clamping portion (21) is clamped and fixed on the adjusting rod (8) by screwing the fastener.

9. The transformer core stress detection apparatus of any of claims 3-8, wherein, The end face of the test probe (7) corresponding to the connecting hole (91) is provided with friction texture, and the friction texture avoids the deviation of the test probe (7).

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