A reliability testing device for the research and development of precision instruments

Abstract

The present invention discloses a reliability detection device for the research and development of precision instruments, belonging to the technical field of the detection of high and low voltage CT ratio testers. It includes a detection table, and a current clamp installation mechanism and an induced current generation and detection mechanism are arranged at the bottom of the detection table, which are respectively used to install the current clamp to the part to be detected on the detection table and detect the magnitude of the induced current in the clamp part of the current clamp. By setting an integrated current clamp detection device, the present invention realizes the automatic determination of the detection process through the induced current generation and detection mechanism, enabling the current clamps that meet the standards to enter the subsequent detection link. If they are unqualified, the rejection mechanism is triggered to notify the operator for fixed-point disassembly. Moreover, through a multi-axis adjustable arc-shaped magnet array, a time-varying magnetic field environment that dynamically simulates the actual working conditions of the cable is realized, and an alternating magnetic field interference model that meets the requirements of electromagnetic compatibility testing is constructed, effectively improving the CT ratio measurement accuracy of the current clamp in a complex electromagnetic environment and reducing the uncertainty of the test.

Description

Technical Field

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

[0002] The high - and low - voltage CT ratio tester consists of a mainframe, a primary high - voltage current clamp, a primary flexible current clamp, a secondary low - voltage current clamp, and an insulating rod. Among them, the primary high - voltage current clamp and the primary flexible current clamp respectively monitor the mutual induction of the current at the output end of the high - voltage cable through the circuit loop composed of the primary iron core and the primary coil. The secondary low - voltage current clamp generates an alternating current through the mutual induction 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 parallel cables will produce a superimposed magnetic field effect, resulting in mutual capacitance and mutual inductance coupling between the measured cable and adjacent conductors. The interference component of the alternating magnetic field is positively correlated with the operating frequency, and the asymmetric magnetic field distribution will also cause a phase deviation in the induced current on the secondary side of the CT;

[0004] At the same time, in the core component of the current clamp, the toroidal iron core may cause the iron core and coil to break due to dropping, resulting in a decrease in the magnetic permeability of the instrument, a step change in the equivalent impedance, and distortion of the hysteresis curve, affecting the detection accuracy. Therefore, it is necessary to detect whether the toroidal iron core (coil) is intact and can form a qualified induced current. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that when detecting the induced current of a single cable through a high - and low - voltage CT ratio tester, the generation of the induced current will be affected by the alternating magnetic field generated by the remaining cables, and when the toroidal iron core (coil) drops, resulting in iron core fracture or deformation, or when the coil breaks or there are turning points due to repeated folding, it will cause the mutual - inductance detection current circuit to be open or the resistance value to change, resulting in the disappearance or change of the induced current, affecting the detection accuracy of the high - and low - voltage CT ratio tester. Therefore, a reliability detection device for the research and development of precision instruments is proposed.

[0006] To achieve the above - mentioned purpose, the present invention adopts the following technical solutions:

[0007] A reliability detection device for the research and development of precision instruments includes a detection table for detecting the clamping part of the current clamp. The bottom of the detection table is provided with a current - clamp installation mechanism for installing the current clamp to the part to be detected on the detection table and selectively disassembling it after the current clamp completes the detection. The detection table is provided with an induced - current generation and detection mechanism for detecting the magnitude of the induced current in the clamping part of the current clamp;

[0008] The current clamp installation mechanism includes a mounting disc disposed at the bottom of the detection table. The mounting disc is movably connected with a detection seat through a limit chute. A rotary drive ring is arranged at the bottom of the mounting disc. The rotary drive ring is connected with a stepping motor through a drive rack to provide rotary drive for the rotary drive ring.

[0009] The induced current generation and detection mechanism includes an induced current generation bracket rotatably connected to the inner wall of the detection table. The induced current generation bracket is composed of an interference group annular bracket and a detection group annular bracket. The inner side of the induced current generation bracket is connected with a detection servo motor through a synchronous rack. A detection installation notch is formed in the induced current generation bracket. 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. A pressure detector is arranged at one end of the detection group arc magnet.

[0010] Preferably, a detection port corresponding to the orientation of the detection seat is formed in the inner wall of the detection table. A plurality of limit chutes are provided and are rotationally distributed on the detection table to limit the linear sliding of the detection seat.

[0011] Preferably, an installation arc groove is formed inside the rotary drive ring. The top of the installation arc groove communicates with a selective disassembly groove. The bottom of the detection seat is movably connected with a drive column that selectively slides with the installation arc groove and the selective disassembly groove.

[0012] Preferably, a selective magnet column is fixedly connected to the bottom of the drive column. An electromagnet that repels the selective magnet column is arranged below the rotary drive ring to control the height of the selective magnet column.

[0013] When the selective magnet column is at the lowest position, the drive column slides with the installation arc groove. When the selective magnet column is at the highest position, the drive column slides with the selective disassembly groove.

[0014] Preferably, a limit sleeve rotatably connected with the induced current generation bracket is fixed to the top of the detection table. A limit card slidably connected to the inner wall of the limit sleeve and rotatably connected with the interference group annular bracket is provided. A locking chute rotatably connected with the detection group annular bracket is formed in the inner wall of the limit sleeve.

[0015] Preferably, the limit cards are rotationally distributed inside the limit sleeve. An electric hydraulic cylinder is arranged at the top of the limit card to control the height of the limit card and limit the rotation height of the interference group annular bracket.

[0016] Preferably, an arc-shaped electric telescopic rod is arranged inside the interference group annular bracket. The arc-shaped electric telescopic rod selectively shields the interference group arc-shaped magnets through a magnetic field shielding sleeve, and the interference group arc-shaped magnets are suspended and fixed on the inner wall of the interference group annular bracket through magnetic field shielding rods.

[0017] Preferably, an elastic connecting column is fixed at one end of the detection group arc-shaped magnet, and a force-sensitive resistor is arranged on the side of the elastic connecting column away from the detection group arc-shaped magnet.

[0018] Preferably, an ammeter electrically connected to the force-sensitive resistor is arranged inside the pressure detector, and the ammeter detects that the current increases as the pressure on the force-sensitive resistor increases.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. By setting an integrated current clamp detection device to generate an automated sorting and detection system, the automated determination of the detection process is realized through the induction current generating detection mechanism, so that the current clamps meeting the standards enter the subsequent detection link, and those unqualified trigger the rejection mechanism to notify the operator for fixed-point disassembly, significantly improving the detection efficiency and reducing the cost of manual intervention.

[0021] 2. Through the composite magnetic circuit system of the interference group and the detection group, a time-varying magnetic field environment simulating the actual working conditions of the cable dynamically is realized through a multi-axis adjustable arc-shaped magnet array, the electromagnetic interference scenario between adjacent cables is accurately reproduced, and an alternating magnetic field interference model meeting the requirements of electromagnetic compatibility testing is constructed, effectively improving the CT ratio measurement accuracy of the current clamp in a complex electromagnetic environment and reducing the uncertainty of the test.

[0022] 3. Based on the collaborative control of the annular bracket and the electric telescopic mechanism, an intelligent magnetic shielding regulation system is generated. Through the telescopic adjustment of the magnetic field shielding sleeve, the dynamic control of the magnetic exposure surface is realized. The Helmholtz coil principle is applied to construct a reverse magnetic field cancellation model to achieve the closed-loop control of the magnetic flux density, and the magnetic field cancellation effect when multiple cables fail can be accurately simulated to verify the zero-drift characteristic of the current clamp in the magnetic balance state, achieving the effect of improving the detection sensitivity. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the overall structure of a reliability detection device for precision instrument research and development proposed by the present invention;

[0024] Figure 2 It is an assembly view of a reliability detection device for precision instrument research and development proposed by the present invention;

[0025] Figure 3 For the present invention Figure 2 The enlarged view of the structure at A in;

[0026] Figure 4 Schematic connection diagram of the detection seat and the rotary drive ring when the selective magnet column is at the highest position of a reliability detection device for precision instrument R & D proposed by the present invention;

[0027] Figure 5 Schematic internal structure diagram of the cross-section of the detection seat of a reliability detection device for precision instrument R & D proposed by the present invention;

[0028] Figure 6 Schematic structure diagram of the interference group annular bracket of a reliability detection device for precision instrument R & D proposed by the present invention;

[0029] Figure 7 Schematic internal structure diagram of the cross-section of the interference group annular bracket of a reliability detection device for precision instrument R & D proposed by the present invention;

[0030] Figure 8 Schematic structure diagram of the detection group annular bracket of a reliability detection device for precision instrument R & D proposed by the present invention;

[0031] Figure 9 Schematic internal structure diagram of the cross-section of the detection group annular bracket of a reliability detection device for precision instrument R & D proposed by the present invention.

[0032] In the figure: 1, detection table; 11, detection port; 12, limit sleeve; 121, limit card; 122, locking chute; 2, mounting disc; 21, limit chute; 3, detection seat; 31, drive column; 311, selective magnet column; 4, rotary drive ring; 41, drive rack; 42, mounting arc groove; 43, selective disassembly groove; 44, electromagnet; 5, stepper motor; 6, induction current generating bracket; 61, synchronous rack; 62, detection mounting notch; 7, interference group annular bracket; 71, interference group arc magnet; 711, magnetic field shielding rod; 72, arc electric telescopic rod; 721, magnetic field shielding sleeve; 8, detection group annular bracket; 81, detection group arc magnet; 811, elastic connection column; 82, pressure detector; 9, detection servo motor; 10, electric hydraulic cylinder. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example, referring to Figures 1 to 9 , a reliability testing device for the research and development of precision instruments, including a testing table 1 for detecting the clamp-shaped part of a current clamp. A current clamp mounting mechanism is provided at the bottom of the testing table 1, which is used to mount the current clamp to the part to be tested on the testing table 1 and selectively disassemble it after the current clamp completes the detection. An induced current generation and detection mechanism is provided on the testing table 1, which is used to detect the magnitude of the induced current in the clamp-shaped part of the current clamp.

[0037] It should be noted that: when performing reliability testing on a high and low voltage CT ratio tester in the present invention, it is to detect whether the iron core or coil in the clamp-shaped part of its current clamp can form a loop current, and to detect whether there is a break in the iron core or coil resulting in a circuit break in the detection circuit; and by detecting that the circular coil in the clamp-shaped part of the current clamp generates an induced current under the influence of a changing magnetic field. Based on this, when the induced current passes through the clamp-shaped part of the current clamp, a magnetic field that hinders the change and is opposite to the direction of the changing magnetic field will be generated, suppressing the magnetic field change, and thus hindering the continued rotation of the arc-shaped magnet in the induced current generating bracket 6. This is the prior art, such as: the copper tube magnet block falling test for verifying Lenz's law.

[0038] Such as Figures 1 to 5 As shown, the current clamp mounting mechanism includes a mounting plate 2 provided at the bottom of the testing table 1. The mounting plate 2 is movably connected with a detection seat 3 through a limit sliding groove 21. A rotary drive ring 4 is provided at the bottom of the mounting plate 2. The rotary drive ring 4 is connected with a stepping motor 5 through a drive rack 41 to provide rotary drive for the rotary drive ring 4.

[0039] It should be noted that when the stepping motor 5 starts, the driving gear set 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 at the top to move towards the detection table 1, moving the clamp part of the current clamp installed at the top of the detection seat 3 from the detection port 11 to the rotation trajectory of the induction current generating bracket 6, so that the annular plane of the clamp part is perpendicular to the rotation path of the induction current generating bracket 6;

[0040] Furthermore, a detection port 11 corresponding to the orientation of the detection seat 3 is opened on the inner wall of the detection table 1. There are multiple limit sliding grooves 21, which are rotationally distributed on the detection table 1 to limit the linear sliding of the detection seat 3. An installation arc groove 42 is opened inside the rotating driving ring 4, and the top of the installation arc groove 42 is communicated with a selective disassembly groove 43. The bottom of the detection seat 3 is movably connected with a driving column 31 that selectively slides with the installation arc groove 42 and the selective disassembly groove 43;

[0041] 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 arranged below the rotating driving ring 4 to control the height of the selective magnet column 311;

[0042] It should be noted that when the selective magnet column 311 is at the lowest position, the driving column 31 is slidably connected with the installation arc groove 42. When the selective magnet column 311 is at the highest position, the driving column 31 is slidably connected with the selective disassembly groove 43;

[0043] Based on the above, the selective disassembly groove 43 is divided into two parts: an annular groove and an arc groove communicated with 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. Therefore, when the rotating driving ring 4 rotates, the driving column 31 is slidably connected with the annular groove part of the selective disassembly groove 43, without changing the movement trajectory of the driving column 31. For the current clamp, it means that no disassembly operation is performed on the current clamp corresponding to the top of the detection seat 3 at this driving column 31, so that it can continue the next item of detection through the induction current generating bracket 6;

[0044] Similarly, when the electromagnet 44 is not energized, the selective magnet column 311 is located in the installation arc groove 42. When the rotating driving ring 4 rotates, the driving column 31 is slidably connected with the annular groove part of the selective disassembly groove 43, changing the movement trajectory of the driving column 31, causing the detection seat 3 to move away from the detection table 1 along the limit sliding groove 21. For the current clamp, it means that an installation or disassembly operation is performed on the current clamp corresponding to the top of the detection seat 3 at this driving column 31, so that it can freely move from the detection port 11 of the detection table 1;

[0045] Based on the above, when the current clamp needs to be installed on the top of the detection table 1 or disassembled from the detection port 11 thereof, at this time, the detection seat 3 needs to wait for the detection installation notch 62 of the induction current generating bracket 6 to move to the corresponding detection port 11. When the current clamp is being detected, the detection seat 3 is located on the side of the limit sliding groove 21 close to the detection table 1, so that the detection loop formed by the clamp part of the current clamp can be rotated through by the induction current generating bracket 6. The detection loop mentioned here is the detection loop structure formed by the existing clamp-type current clamp, which is the prior art and will not be described in detail later.

[0046] As Figures 6 to 9 shown, the induction current generating detection mechanism includes an induction current generating bracket 6 rotatably connected to the inner wall of the detection table 1. The induction 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 induction current generating bracket 6 is connected with a detection servo motor 9 through a synchronous rack 61. The induction 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. The magnetic field distributions of the interference group arc magnet 71 and the detection group arc magnet 81 are symmetrically distributed. One end of the detection group arc magnet 81 is provided with a pressure detector 82.

[0047] It should be noted that: when the interference group arc magnet 71 or the detection group arc magnet 81 rotates through the detection loop of the current clamp, due to the change in the magnetic field orientation, the magnetic induction lines will cut the detection loop, generating an induced current. This is the prior art and will not be described in detail later.

[0048] Based on the above, according to the movement sequence of the interference group annular bracket 7 from high to low, it is divided into an interference test detection and a simulation test detection process. During the interference test detection process of the current clamp, the interference group arc magnet 71 is located outside the detection loop, and the detection group arc magnet 81 is located inside the detection loop. Thus, when the interference group arc magnet 71 with a changing exposure range and the detection group arc magnet 81 with an overall exposure range rotate through, it can simulate the real situation that when the current clamp detects a wire in reality, it will be affected by the magnetic field generated by other wires and change the internal current. According to the magnitude of the resistance of the magnetic field hindering generated by the induced current of the detection loop received by the pressure detector 82, it can be detected whether the detection loop part of the current clamp will be affected by the alternating magnetic field generated by other cables to generate an induced current, thereby improving the detection accuracy of the current clamp of the high and low voltage CT ratio tester.

[0049] During the simulation test of the current clamp to-be-tested loop, at this time, both the interference group arc magnet 71 and the detection group arc magnet 81 are located inside the to-be-tested loop. The magnetic fields of the completely exposed interference group arc magnet 71 and the detection group arc magnet 81 cancel each other out, simulating the phenomenon that when the current clamp simultaneously detects the live wire and the neutral wire, due to the same magnetic field intensity and opposite magnetic field directions of the live wire and the neutral wire, the magnetic field cancellation results in a zero induced current. And the magnitude of the resistance generated by the induced current of the to-be-tested loop to hinder the magnetic field is received by the pressure detector 82, and is compared with the magnitude of the resistance when the completely enclosed interference group arc magnet 71 and the completely exposed detection group arc magnet 81 pass through the to-be-tested loop, so as to judge whether the resistance at this time is generated by the iron core attracting the detection group arc magnet 81, or due to the change in the orientation of the detection group arc magnet 81 causing the magnetic induction line to cut the to-be-tested loop and generating the resistance to hinder the magnetic field, thereby improving the detection accuracy of the pressure detector 82 for the current clamp to-be-tested loop.

[0050] Furthermore, a limit sleeve 12 rotatably connected to the induction current generating bracket 6 is fixed on the top of the detection table 1. A limit card 121 slidably connected to the inner wall of the limit sleeve 12 and rotatably connected to the interference group annular bracket 7 is provided. A locking chute 122 rotatably connected to the detection group annular bracket 8 is provided on the inner wall of the limit sleeve 12. The limit cards 121 are rotationally distributed inside the limit sleeve 12. 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 restricting the rotation height of the interference group annular bracket 7.

[0051] 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 position, at this time, the interference group annular bracket 7 is located at the top of the current clamp to-be-tested loop. When it is at the lowest position, at this time, it is located inside the loop of the current clamp to-be-tested loop.

[0052] Furthermore, an arc-shaped electric telescopic rod 72 is arranged inside the interference group annular bracket 7. The arc-shaped electric telescopic rod 72 selectively shields the interference group arc magnet 71 through a magnetic field shielding sleeve 721, and the interference group arc magnet 71 is suspended and fixed on the inner wall of the interference group annular bracket 7 through a magnetic field shielding rod 711.

[0053] It should be noted that: the interference group arc magnet 71 changes the exposure range through the movement of the magnetic field shielding sleeve 721, so as to be able to adjust the magnetic field intensity of the interference group arc magnet 71 on the to-be-tested part of the current clamp to-be-tested loop. Furthermore, the test error can be reduced through multiple groups of detections, and the detection accuracy of the pressure detector 82 for the current clamp to-be-tested loop part can be improved.

[0054] Further, one end of the arc magnet 81 of the detection group is fixed with an elastic connection column 811. A force-sensitive resistor is arranged on the side of the elastic connection 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. The ammeter detects that the current increases as the pressure on the force-sensitive resistor increases.

[0055] It should be noted that when the arc magnet 81 of the detection group passes through the part of the current clamp to-be-detected loop, an induced current will be generated in the to-be-detected loop, generating a magnetic field obstruction, hindering the continuous rotation of the arc magnet 81 of the detection group, causing the other end of the arc magnet 81 of the detection group that rotates forward to squeeze the force-sensitive resistor, changing the current passing through the force-sensitive resistor, and specifically displaying this change through the reading of the ammeter, so that the magnitude of the induced current generated by the to-be-detected loop can be displayed in a dataized manner.

[0056] Working principle:

[0057] When the present invention changes the orientation of the current clamp, it is divided into the current clamp installation and selective disassembly processes. When detecting the current clamp to-be-detected loop, it is divided into the interference test detection process and the simulation test detection process. Among them, the current clamp installation process is as follows: When starting the stepping motor 5, it drives the detection seat 3 to slide along the limit chute 21 towards the side close to the detection table 1, thereby moving the current clamp to the detection port 11 to complete its installation process;

[0058] Based on the above, in the interference test detection process and the simulation test detection process of the current clamp to-be-detected loop, the induced currents generated by multiple to-be-detected loops of the same specification should be the same, that is, the induced currents of the current clamp to-be-detected loops at the three detection ports 11 should be the same. When the induced currents at the three places are the same, at this time, the current clamp selective disassembly process is carried out: that is, the electromagnet 44 is energized. After the electromagnet 44 is energized, its polarity is opposite to that 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. Thus, when the rotation drive ring 4 rotates, the drive column 31 is slidably connected to the annular groove part of the selective disassembly groove 43, without changing the movement track of the drive column 31. For the current clamp, it means that no disassembly operation is performed on the current clamp corresponding to the top of the detection seat 3 where the drive column 31 is located, so that it can continue the next detection through the induced current generating bracket 6;

[0059] Based on the above, when there is a large deviation in the induced current at one place, at this time, the electromagnet 44 is not energized, and the selective magnet column 311 is located in the installation arc groove 42. When the rotation drive ring 4 rotates, the drive column 31 is slidably connected to the annular groove part of the selective disassembly groove 43, changing the movement track of the drive column 31. For the current clamp, it means that an installation or disassembly operation is performed on the current clamp corresponding to the top of the detection seat 3 where the drive column 31 is located.

[0060] Based on the above, during the detection process of the current clamp interference test, the arc magnet 71 of the interference group is located outside the test ring, and the arc magnet 81 of the detection group is located inside the test ring. Thus, when the arc magnet 71 of the interference group with a changing exposure range and the arc magnet 81 of the detection group with a full exposure range rotate past, it can simulate the real situation that when the current clamp detects a wire in reality, the magnetic field generated by the other wires will affect the internal current, and according to the magnitude of the resistance received by the pressure detector 82, which is generated by the induced current of the test ring to hinder the magnetic field, it can be detected whether the test ring part of the current clamp will generate an induced current due to the alternating magnetic field generated by the other cables, thereby improving the detection accuracy of the current clamp of the high and low voltage CT ratio tester.

[0061] Based on the above, during the simulation test detection process of the current clamp test ring, at this time, both the arc magnet 71 of the interference group and the arc magnet 81 of the detection group are located inside the test ring. By the magnetic fields of the fully exposed arc magnet 71 of the interference group and the arc magnet 81 of the detection group canceling each other out, it simulates the phenomenon that when the current clamp detects the live wire and the neutral wire simultaneously, the induced current is zero due to the magnetic fields of the live wire and the neutral wire having the same magnetic field intensity and opposite magnetic field directions resulting in magnetic field cancellation, and by comparing the magnitude of the resistance received by the pressure detector 82, which is generated by the induced current of the test ring to hinder the magnetic field, with the magnitude of the resistance when the fully enclosed arc magnet 71 of the interference group and the fully exposed arc magnet 81 of the detection group pass through the test ring, it is determined whether the resistance at this time is generated by the iron core attracting the arc magnet 81 of the detection group or is the resistance brought about by the change in the orientation of the arc magnet 81 of the detection group causing the magnetic induction lines to cut the test ring and generate a magnetic field to be hindered, thereby improving the detection accuracy of the pressure detector 82 for the current clamp test ring.

[0062] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within 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 generation detection mechanism comprises an induced current generation bracket (6) rotatably connected to the inner wall of the detection platform (1), the induced current generation bracket (6) comprising an interference group annular bracket (7) and a detection group annular bracket (8), and the inner side of the induced current generation bracket (6) is connected to a detection servo motor (9) via 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 a pressure detector (82) is provided at one end of the detection group arc magnet (81); 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).

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: 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.

8. The reliability testing equipment for precision instrument development according to claim 7, 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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