Reliability detection equipment for research and development of precise instrument

Abstract

The invention discloses reliability detection equipment for precision instrument research and development, and belongs to the technical field of high and low voltage CT transformation ratio tester detection. The reliability detection equipment comprises a detection table, and the bottom of the detection table is provided with a current clamp installation mechanism and an induced current generation detection mechanism; the current clamp is installed on a to-be-detected part of the detection table, and the clamp-shaped part of the current clamp is used for detecting the induction current. The integrated current clamp detection device is arranged, automatic judgment of the detection process is achieved through the induction current generation detection mechanism, the current clamps meeting the standard enter the subsequent detection link, and if the current clamps are unqualified, the rejection mechanism is triggered to inform an operator to conduct fixed-point disassembly; the time-varying magnetic field environment of the actual working condition of the cable is dynamically simulated through the multi-axis adjustable arc-shaped magnet array, an alternating magnetic field interference model meeting the electromagnetic compatibility test requirement is constructed, the CT transformation ratio measurement precision of the current clamp in the complex electromagnetic environment is effectively improved, and the test uncertainty is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of high and low voltage CT ratio tester detection, and in particular to a reliability detection device for precision instrument research and development. Background Art

[0002] The high and low voltage CT ratio tester consists of a main unit, a primary high voltage current clamp, a primary flexible current clamp, a secondary low voltage current clamp and an insulating rod. The primary high voltage current clamp and the primary flexible current clamp respectively monitor the mutual inductance of the current at the output end of the high voltage cable through a circuit loop composed of a primary iron core and a primary coil. The secondary low voltage current clamp generates an alternating current through the mutual inductance of the primary iron core, generates an alternating magnetic field, affects the secondary coil, and generates a secondary induced current.

[0003] In the test scenario of the high and low voltage CT ratio tester, the topological structure of multiple cables in parallel will produce a superimposed magnetic field effect, resulting in mutual capacitance and mutual inductance coupling between the tested cable and the adjacent conductors. The alternating magnetic field interference component is positively correlated with the operating frequency. The asymmetric magnetic field distribution will also cause the CT secondary measured induced current to produce a phase deviation. At the same time, if the annular core of the current clamp core component falls, the core and coil will break, which will cause the magnetic permeability of the instrument to decrease, the equivalent impedance to change in step, and the hysteresis curve to distort, affecting the detection accuracy. Therefore, it is necessary to detect whether the annular core (coil) is intact and can form a qualified induced current. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that when a single cable is tested for induced current by a high and low voltage CT ratio tester, the alternating magnetic field generated by the remaining cables affects the generation of the induced current, and the annular iron core (coil) is broken or deformed due to falling, and the coil is broken or has a turning point due to repeated folding, which will cause the mutual inductance detection current loop to be broken or the resistance value to change, causing the induced current to disappear or change, thereby affecting the detection accuracy of the high and low voltage CT ratio tester. A reliability detection device for the research and development of precision instruments is proposed to solve the problem that when a single cable is tested for induced current by a high and low voltage CT ratio tester, the alternating magnetic field generated by the remaining cables affects the generation of the induced current, and the annular iron core (coil) is broken or deformed due to falling, and the coil is broken or has a turning point due to repeated folding, which will cause the mutual inductance detection current loop to be broken or the resistance value to change, causing the induced current to disappear or change, thereby affecting the detection accuracy of the high and low voltage CT ratio tester.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A reliability testing device for precision instrument development, comprising a testing platform for testing the clamp-shaped part of a current clamp, a current clamp installation mechanism is provided at the bottom of the testing platform, which is used to install the current clamp to the part to be tested on the testing platform, and selectively disassemble the current clamp after the current clamp completes the test, and an induced current generation detection mechanism is provided on the testing platform, which is used to detect the magnitude of the induced current at the clamp-shaped part of the current clamp; The current clamp installation mechanism comprises a mounting plate arranged at the bottom of the detection platform, the mounting plate is movably connected to the detection seat through a limiting slide groove, a rotating drive ring is arranged at the bottom of the mounting plate, and the rotating drive ring is connected to a stepping motor through a driving rack to provide rotational drive for the rotating drive ring; The induced current generating detection mechanism includes an induced current generating bracket rotatably connected to the inner wall of the detection platform, the induced current generating bracket is composed of an interference group annular bracket and a detection group annular bracket, the inner side of the induced current generating bracket is connected to a detection servo motor through a synchronous rack, the induced current generating bracket is provided with a detection installation notch, an interference group arc magnet is fixedly installed in the interference group annular bracket, a detection group arc magnet is movably connected in the detection group annular bracket, and a pressure detector is arranged at one end of the detection group arc magnet.

[0006] Preferably, the inner wall of the detection platform is provided with a detection port corresponding to the position of the detection seat, and a plurality of limit slide grooves are provided, which are rotatably distributed on the detection platform to limit the linear sliding of the detection seat.

[0007] Preferably, a mounting arc groove is provided inside the rotating drive ring, the top of the mounting arc groove is connected to a selective disassembly groove, and a driving column selectively slidably connected to the mounting arc groove and the selective disassembly groove is movably connected to the bottom of the detection seat.

[0008] Preferably, a selective magnet column is fixedly connected to the bottom of the driving column, and an electromagnet that repels the selective magnet column is provided below the rotating driving ring to control the height of the selective magnet column; When the selective magnet column is at the lowest position, the driving column is slidably connected to the installation arc groove, and when the selective magnet column is at the highest position, the driving column is slidably connected to the selective removal groove.

[0009] Preferably, a limit sleeve rotatably connected to the induced current generating bracket is fixed on the top of the detection platform, and the inner wall of the limit sleeve is slidably connected to a limit card rotatably connected to the interference group annular bracket, and the inner wall of the limit sleeve is provided with a locking groove rotatably connected to the detection group annular bracket.

[0010] Preferably, the limit card is rotatably distributed inside the limit sleeve, and an electric hydraulic cylinder is provided on the top of the limit card to control the height of the limit card and limit the rotation height of the annular bracket of the interference group.

[0011] Preferably, an arc-shaped electric telescopic rod is arranged in the interference group annular bracket, and the arc-shaped electric telescopic rod selectively shields the interference group arc-shaped magnet through a magnetic field shielding sleeve, and the interference group arc-shaped magnet is suspended and fixed to the inner wall of the interference group annular bracket through the magnetic field shielding rod.

[0012] Preferably, an elastic connecting column is fixed to one end of the arc magnet of the detection group, and a force-sensitive resistor is arranged on the side of the elastic connecting column away from the arc magnet of the detection group.

[0013] Preferably, an ammeter electrically connected to the force-sensitive resistor is provided in the pressure detector, and the current detected by the ammeter increases as the pressure on the force-sensitive resistor increases.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up an integrated current clamp detection device, an automated sorting and detection system is generated. The detection process is automatically determined through the induction current generation detection mechanism, so that current clamps that meet the standards can enter the subsequent detection link. If they fail, the rejection mechanism is triggered to notify the operator to perform fixed-point disassembly, which significantly improves the detection efficiency and reduces the cost of manual intervention.

[0015] 2. Through the composite magnetic circuit system of the interference group and the detection group, the multi-axis adjustable arc magnet array is used to dynamically simulate the time-varying magnetic field environment of the actual working conditions of the cable, accurately reproduce the electromagnetic interference scenario of adjacent cables, and construct an alternating magnetic field interference model that meets the requirements of electromagnetic compatibility testing, effectively improving the CT ratio measurement accuracy of the current clamp in a complex electromagnetic environment and reducing the uncertainty of the test.

[0016] 3. Based on the coordinated control of the annular bracket and the electric telescopic mechanism, an intelligent magnetic shielding control system is generated. Through the telescopic adjustment of the magnetic field shielding sleeve, dynamic control of the magnetic exposure surface is achieved. The Helmholtz coil principle is used to construct a reverse magnetic field cancellation model to achieve closed-loop control of the magnetic flux density. The magnetic field cancellation effect when multiple cables fail can be accurately simulated, and the zero-point drift characteristics of the current clamp in the magnetic balance state can be verified to achieve the effect of improving the detection sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a reliability testing device for precision instrument development proposed by the present invention; Figure 2 This is an assembly view of a reliability testing device for precision instrument development proposed by the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at center A; Figure 4 This is a schematic diagram of the structural connection between the detection base and the rotating drive ring of a reliability detection device for precision instrument development proposed by the present invention when the selective magnet column is at the highest point; Figure 5 A schematic diagram of the internal structure of a cross section of a detection base of a reliability detection device for precision instrument development proposed by the present invention; Figure 6 This is a schematic diagram of the structure of an interference group ring bracket of a reliability detection device for precision instrument research and development proposed by the present invention; Figure 7 A schematic diagram of the internal structure of the cross section of an annular support of an interference group of a reliability detection device for precision instrument development proposed by the present invention; Figure 8 This is a schematic structural diagram of a ring bracket of a detection group of a reliability detection device for precision instrument development proposed by the present invention; Fig. 9 This is a schematic diagram of the internal structure of the cross section of the annular bracket of the detection group of a reliability detection device for the research and development of precision instruments proposed by the present invention.

[0018] In the figure: 1. detection table; 11. detection port; 12. limit sleeve; 121. limit card; 122. locking slide; 2. installation plate; 21. limit slide; 3. detection seat; 31. drive column; 311. selective magnet column; 4. rotating drive ring; 41. drive rack; 42. installation arc groove; 43. selective disassembly groove; 44. electromagnet; 5. stepping motor; 6. induced current generating bracket; 61. synchronous rack; 62. detection installation gap; 7. interference group annular bracket; 71. interference group arc magnet; 711. magnetic field shielding rod; 72. arc-shaped electric telescopic rod; 721. magnetic field shielding sleeve; 8. detection group annular bracket; 81. detection group arc magnet; 811. elastic connecting column; 82. pressure detector; 9. detection servo motor; 10. electric hydraulic cylinder. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] Example, see Figures 1 to 9 A reliability testing device for the research and development of precision instruments includes a testing platform 1 for testing the clamp-shaped part of a current clamp. A current clamp mounting mechanism is provided at the bottom of the testing platform 1 for mounting the current clamp to the part to be tested of the testing platform 1 and selectively disassembling the current clamp after the current clamp completes the test. An induced current generation detection mechanism is provided on the testing platform 1 for detecting the magnitude of the induced current at the clamp-shaped part of the current clamp.

[0023] It should be noted that: in the present invention, when the reliability test of the high and low voltage CT ratio tester is carried out, it is detected whether the iron core or coil of the clamp part of the current clamp can form a ring loop current, and whether a fracture occurs in the iron core or coil, resulting in a broken circuit in the detection circuit; and by detecting that the ring coil of the clamp part of the current clamp generates an induced current under the influence of the changing magnetic field, based on this, when the induced current passes through the clamp part of the current clamp, an obstructing magnetic field in the opposite direction to the changing magnetic field will be generated, which inhibits the change of the magnetic field, thereby hindering the arc magnet in the induced current generating bracket 6 from continuing to rotate. This is a prior art, such as: a copper tube magnet block drop test to verify Lenz's law.

[0024] like Figures 1 to 5 As shown, the current clamp installation mechanism includes a mounting plate 2 arranged at the bottom of the detection platform 1, the mounting plate 2 is movably connected to the detection seat 3 through a limiting slide groove 21, and a rotating drive ring 4 is arranged at the bottom of the mounting plate 2. The rotating drive ring 4 is connected to a stepping motor 5 through a driving rack 41 to provide rotational drive for the rotating drive ring 4.

[0025] It should be noted that: when the stepper motor 5 is started, the driving gear arranged on the output shaft is connected to the driving rack 41, driving the rotating driving ring 4 to rotate, and causing the detection seat 3 on the top to move toward the detection platform 1, and moving the current clamp-shaped part installed on the top of the detection seat 3 from the detection port 11 to the rotation track of the induced current generating bracket 6, so that the annular plane of the clamp-shaped part is perpendicular to the rotation path of the induced current generating bracket 6; Furthermore, the inner wall of the detection platform 1 is provided with a detection port 11 corresponding to the orientation of the detection seat 3, a plurality of limit slide grooves 21 are provided, which are rotatably distributed on the detection platform 1 to limit the linear sliding of the detection seat 3, and a mounting arc groove 42 is provided inside the rotary drive ring 4, and the top of the mounting arc groove 42 is connected to a selective disassembly groove 43, and the bottom of the detection seat 3 is movably connected to a driving column 31 that is selectively slidably connected to the mounting arc groove 42 and the selective disassembly groove 43; The bottom of the driving column 31 is fixedly connected with a selective magnet column 311, and an electromagnet 44 that repels the selective magnet column 311 is arranged below the rotating driving ring 4 to control the height of the selective magnet column 311; It should be noted that: when the selective magnet column 311 is at the lowest position, the driving column 31 is slidably connected to the installation arc groove 42, and when the selective magnet column 311 is at the highest position, the driving column 31 is slidably connected to the selective removal groove 43; Based on the above, the selective disassembly groove 43 is divided into an annular groove and an arc groove connected to the installation arc groove 42. After the electromagnet 44 is energized, its polarity is opposite to that of the selective magnet column 311, which will drive the driving column 31 to slide upward in the detection seat 3. At this time, the selective magnet column 311 is located at the annular groove of the selective disassembly groove 43, so that when the rotary drive ring 4 rotates, the driving column 31 is slidably connected with the annular groove of the selective disassembly groove 43, and the movement trajectory of the driving column 31 is not changed. The action of the current clamp is that the current clamp corresponding to the top of the detection seat 3 of the driving column 31 here is not disassembled, so that it can continue to perform the next detection through the induction current generating bracket 6; Similarly, when the electromagnet 44 is not energized, the selective magnet column 311 is located in the installation arc groove 42. When the rotary drive ring 4 rotates, the drive column 31 is slidably connected with the annular groove portion of the selective removal groove 43, changing the movement trajectory of the drive column 31, so that the detection seat 3 moves along the limiting slide groove 21 in a direction away from the detection platform 1. The action of the current clamp is to install or remove the current clamp corresponding to the top of the detection seat 3 of the drive column 31, so that it can move freely from the detection port 11 of the detection platform 1. Based on the above, when the current clamp needs to be installed on the top of the detection platform 1 or removed from its detection port 11, the detection seat 3 needs to wait for the detection installation notch 62 of the induced current generating bracket 6 to move to the corresponding detection port 11. When the current clamp is detecting, the detection seat 3 is located on the side of the limiting slide groove 21 close to the detection platform 1, so that the ring to be tested formed by the clamp-shaped part of the current clamp can be rotated and passed through by the induced current generating bracket 6. The ring to be tested mentioned here is a detection ring structure formed by the existing clamp-shaped current clamp, which is a prior art and will not be repeated in the following.

[0026] like Figures 6 to 9As shown, the induced current generating detection mechanism includes an induced current generating bracket 6 rotatably connected to the inner wall of the detection platform 1, the induced current generating bracket 6 is composed of an interference group annular bracket 7 and a detection group annular bracket 8, the inner side of the induced current generating bracket 6 is connected to a detection servo motor 9 through a synchronous rack 61, the induced current generating bracket 6 is provided with a detection installation notch 62, an interference group arc magnet 71 is fixedly installed in the interference group annular bracket 7, a detection group arc magnet 81 is movably connected in the detection group annular bracket 8, and the magnetic field of the interference group arc magnet 71 is symmetrically distributed with the magnetic field distribution of the detection group arc magnet 81, and a pressure detector 82 is arranged at one end of the detection group arc magnet 81.

[0027] It should be noted that when the arc magnet 71 of the interference group or the arc magnet 81 of the detection group rotates through the ring to be tested of the current clamp, the magnetic field orientation changes, causing the magnetic induction line to cut the ring to be tested, so that it generates an induced current. This is a prior art and will not be described in detail in the subsequent description. Based on the above, according to the movement sequence of the interference group annular bracket 7 from high to low, it is divided into interference test detection and simulation test detection process. In the interference test detection process of the current clamp, the interference group arc magnet 71 is located on the outside of the ring to be tested, and the detection group arc magnet 81 is located on the inside of the ring to be tested. When the interference group arc magnet 71 with a changed exposure range and the detection group arc magnet 81 with a full exposure range rotate through, it can simulate that when the current clamp actually detects the wire, it will be affected by the magnetic field generated by the other wires, changing the actual situation of the internal current, and according to the resistance of the pressure detector 82 to the magnetic field generated by the induced current of the ring to be tested, it can detect whether the part of the ring to be tested of the current clamp will be affected by the alternating magnetic field generated by the other cables to generate the induced current, thereby improving the detection accuracy of the current clamp of the high and low voltage CT ratio tester; During the simulation test process of the current clamp test ring, the interference group arc magnet 71 and the detection group arc magnet 81 are both located on the inner side of the test ring, and the magnetic fields of the fully exposed interference group arc magnet 71 and the detection group arc magnet 81 cancel each other out, simulating the current clamp to detect the live wire and the neutral wire at the same time. Since the magnetic field strengths of the live wire and the neutral wire are the same, the magnetic fields generated by the opposite magnetic fields cancel out the induced current, resulting in a phenomenon of zero. The pressure detector 82 receives the magnitude of the resistance generated by the induced current of the test ring to hinder the magnetic field, and compares it with the magnitude of the resistance when the fully enclosed interference group arc magnet 71 and the fully exposed detection group arc magnet 81 pass through the test ring. It is determined whether the resistance at this time is generated by the iron core attracting the detection group arc magnet 81, or whether the resistance is generated by the change in the orientation of the detection group arc magnet 81, causing the magnetic induction line to cut the test ring and generate resistance caused by the obstructive magnetic field, thereby improving the detection accuracy of the pressure detector 82 on the current clamp test ring.

[0028] Furthermore, a limit sleeve 12 rotatably connected to the induced current generating bracket 6 is fixed on the top of the detection platform 1, and a limit card 121 rotatably connected to the interference group annular bracket 7 is slidably connected to the inner wall of the limit sleeve 12. A locking groove 122 rotatably connected to the detection group annular bracket 8 is provided on the inner wall of the limit sleeve 12. The limit card 121 is rotatably distributed inside the limit sleeve 12, and an electric hydraulic cylinder 10 is arranged on the top of the limit card 121 for controlling the height of the limit card 121 and limiting the rotation height of the interference group annular bracket 7.

[0029] It should be noted that the interference group annular bracket 7 changes the height of its rotation trajectory through the electric hydraulic cylinder 10. When the interference group annular bracket 7 is at the highest point, the interference group annular bracket 7 is located at the top of the current clamp test ring. When it is at the lowest point, it is located inside the ring of the current clamp test ring.

[0030] Furthermore, an arc-shaped electric telescopic rod 72 is provided in the interference group annular bracket 7, and the arc-shaped electric telescopic rod 72 selectively shields the interference group arc-shaped magnet 71 through a magnetic field shielding sleeve 721, and the interference group arc-shaped magnet 71 is suspended and fixed to the inner wall of the interference group annular bracket 7 through a magnetic field shielding rod 711.

[0031] It should be noted that the interference group arc magnet 71 changes the exposure range by moving the magnetic field shielding sleeve 721, so that the magnetic field strength of the interference group arc magnet 71 on the current clamp test ring to be inspected can be adjusted, and then the test error can be reduced through multiple groups of detection, thereby improving the detection accuracy of the pressure detector 82 on the current clamp test ring to be inspected.

[0032] Furthermore, an elastic connecting column 811 is fixed at one end of the arc magnet 81 of the detection group, and a force-sensitive resistor is arranged on the side of the elastic connecting column 811 away from the arc magnet 81 of the detection group. An ammeter electrically connected to the force-sensitive resistor is arranged in the pressure detector 82, and the current detected by the ammeter increases as the pressure on the force-sensitive resistor increases.

[0033] It should be noted that: when the arc magnet 81 of the detection group passes through the part of the ring to be tested of the current clamp, the ring to be tested will generate an induced current, which will produce an obstructive magnetic field, hindering the detection group arc magnet 81 from continuing to rotate, so that the other end of the detection group arc magnet 81 rotates forward and squeezes the force-sensitive resistor, changing the current passing through the force-sensitive resistor, and displaying this change in detail through the current representation number, so that the size of the induced current generated by the ring to be tested can be displayed in a digital form.

[0034] Working principle: The present invention is divided into the current clamp installation and selective disassembly process when the current clamp orientation is changed, and is divided into the interference test detection process and the simulation test detection process when the current clamp to be tested ring is tested. The current clamp installation process is: when the stepper motor 5 is started, the detection seat 3 is driven to slide along the limit slide groove 21 to the side close to the detection platform 1, so that the current clamp is moved to the detection port 11, and the installation process is completed; Based on the above, according to the interference test detection process and the simulation test detection process of the current clamp to be tested ring, the induced current generated by multiple to-be-tested rings of the same specification should be the same, that is, the induced current of the current clamp to be tested rings at the three detection ports 11 should be the same. When the induced currents at the three locations are the same, the current clamp selective disassembly process is performed at this time: that is, the electromagnet 44 is energized. After the electromagnet 44 is energized, its polarity is opposite to the polarity of the selective magnet column 311, which will drive the selective magnet column 311 to slide upward in the detection seat 3. At this time, the selective magnet column 311 is located at the annular groove of the selective disassembly groove 43, so that when the rotating drive ring 4 rotates, the drive column 31 is slidably connected to the annular groove portion of the selective disassembly groove 43, and the movement trajectory of the drive column 31 is not changed. The action of the current clamp is manifested as not disassembling the current clamp at the top of the detection seat 3 corresponding to the drive column 31 here, so that it can continue to perform the next detection through the induced current generating bracket 6; Based on the above, when a large deviation occurs in the induced current at one place, the electromagnet 44 is not energized, and the selective magnet column 311 is located in the installation arc groove 42. When the rotating drive ring 4 rotates, the drive column 31 is slidably connected with the annular groove portion of the selective disassembly groove 43, thereby changing the movement trajectory of the drive column 31. The action of the current clamp is manifested as installing or disassembling the current clamp at the top of the detection seat 3 corresponding to the drive column 31 here.

[0035] Based on the above, in the process of the current clamp interference test detection, the interference group arc magnet 71 is located outside the ring to be tested, and the detection group arc magnet 81 is located inside the ring to be tested. When the interference group arc magnet 71 with a changed exposure range and the detection group arc magnet 81 with a full exposure range rotate through, it can simulate the current clamp actually detecting the wire, which will be affected by the magnetic field generated by the other wires, changing the actual situation of the internal current. According to the resistance of the pressure detector 82 to the magnetic field generated by the induced current of the ring to be tested, it can detect whether the part of the current clamp to be tested will be affected by the alternating magnetic field generated by the other cables to generate induced current, thereby improving the detection accuracy of the current clamp of the high and low voltage CT ratio tester.

[0036] Based on the above, when the simulation test detection process is carried out on the current clamp test ring, the interference group arc magnet 71 and the detection group arc magnet 81 are both located on the inner side of the test ring, and the magnetic fields of the fully exposed interference group arc magnet 71 and the detection group arc magnet 81 cancel each other out, and the simulated current clamp detects the live wire and the neutral wire at the same time. Since the magnetic field strengths of the live wire and the neutral wire are the same, the magnetic fields generated by the opposite magnetic fields cancel out the induced current, resulting in a phenomenon of zero. The pressure detector 82 receives the magnitude of the resistance generated by the induced current of the test ring to hinder the magnetic field, and compares it with the magnitude of the resistance when the fully enclosed interference group arc magnet 71 and the fully exposed detection group arc magnet 81 pass through the test ring. It is determined whether the resistance at this time is generated by the iron core attracting the detection group arc magnet 81, or is due to the change in the orientation of the detection group arc magnet 81 causing the magnetic induction line to cut the test ring and generate resistance caused by the obstructive magnetic field, thereby improving the detection accuracy of the pressure detector 82 on the current clamp test ring.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A reliability testing device for precision instrument development, comprising a testing platform (1) for testing the clamping part of a current clamp, characterized in that: A current clamp installation mechanism is provided at the bottom of the detection platform (1), which is used to install the current clamp on the part to be detected of the detection platform (1), and selectively remove the current clamp after the current clamp completes the detection; an induced current generation detection mechanism is provided on the detection platform (1), which is used to detect the magnitude of the induced current at the clamped part of the current clamp; The current clamp installation mechanism comprises a mounting plate (2) arranged at the bottom of the detection platform (1), the mounting plate (2) being movably connected to the detection seat (3) via a limiting slide groove (21), a rotating drive ring (4) being arranged at the bottom of the mounting plate (2), the rotating drive ring (4) being connected to a stepping motor (5) via a driving rack (41) to provide rotational drive for the rotating drive ring (4); The induced current generating detection mechanism comprises an induced current generating bracket (6) rotatably connected to the inner wall of the detection platform (1), the induced current generating bracket (6) comprising an interference group annular bracket (7) and a detection group annular bracket (8), and the inner side of the induced current generating bracket (6) is connected to a detection servo motor (9) via a synchronous rack (61).

2. A reliability testing device for precision instrument development according to claim 1, characterized in that: The inner wall of the detection platform (1) is provided with a detection port (11) corresponding to the orientation of the detection seat (3), and a plurality of limit slide grooves (21) are provided, which are rotatably distributed on the detection platform (1) to limit the linear sliding of the detection seat (3).

3. The reliability testing equipment for precision instrument development according to claim 1, characterized in that: The rotating drive ring (4) has an interior with an installation arc groove (42), the top of the installation arc groove (42) is connected to a selective removal groove (43), and the bottom of the detection seat (3) is movably connected to a drive column (31) that is selectively slidably connected to the installation arc groove (42) and the selective removal groove (43).

4. The reliability testing equipment for precision instrument development according to claim 3, characterized in that: A selective magnet column (311) is fixedly connected to the bottom of the driving column (31), and an electromagnet (44) that repels the selective magnet column (311) is provided below the rotating driving ring (4) for controlling the height of the selective magnet column (311); When the selective magnet column (311) is at the lowest position, the driving column (31) is slidably connected to the installation arc groove (42), and when the selective magnet column (311) is at the highest position, the driving column (31) is slidably connected to the selective removal groove (43).

5. The reliability testing equipment for precision instrument development according to claim 1, characterized in that: A limiting sleeve (12) rotatably connected to the induced current generating bracket (6) is fixed on the top of the detection platform (1), a limiting card (121) rotatably connected to the interference group annular bracket (7) is slidably connected to the inner wall of the limiting sleeve (12), and a locking groove (122) rotatably connected to the detection group annular bracket (8) is formed on the inner wall of the limiting sleeve (12).

6. A reliability testing device for precision instrument development according to claim 5, characterized in that: The limit card (121) is rotatably distributed inside the limit sleeve (12), and an electric hydraulic cylinder (10) is provided on the top of the limit card (121) for controlling the height of the limit card (121) and limiting the rotation height of the interference group annular bracket (7).

7. The reliability testing equipment for precision instrument development according to claim 1, characterized in that: The induced current generating bracket (6) is provided with a detection installation notch (62), an interference group arc magnet (71) is fixedly installed in the interference group annular bracket (7), a detection group arc magnet (81) is movably connected in the detection group annular bracket (8), and a pressure detector (82) is provided at one end of the detection group arc magnet (81).

8. The reliability testing equipment for precision instrument development according to claim 7, characterized in that: An arc-shaped electric telescopic rod (72) is arranged in the interference group annular bracket (7); the arc-shaped electric telescopic rod (72) selectively shields the interference group arc-shaped magnet (71) through a magnetic field shielding sleeve (721); and the interference group arc-shaped magnet (71) is suspended and fixed to the inner wall of the interference group annular bracket (7) through the magnetic field shielding rod (711).

9. The reliability testing equipment for precision instrument development according to claim 7, characterized in that: An elastic connection column (811) is fixed to one end of the arc-shaped magnet (81) of the detection group, and a force-sensitive resistor is arranged on a side of the elastic connection column (811) away from the arc-shaped magnet (81) of the detection group.

10. A reliability testing device for precision instrument development according to claim 9, characterized in that: An ammeter electrically connected to the force-sensitive resistor is arranged in the pressure detector (82), and the current detected by the ammeter increases as the pressure on the force-sensitive resistor increases.

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