A sensor for detecting the positioning of a transformer connection

Abstract

The application discloses a sensor for transformer wiring positioning detection, and relates to the technical field of transformer detection tooling, which comprises a base assembly and a floating detection assembly coaxially nested in the base assembly, a window is formed in the side wall of the base assembly, a transmission mechanism is installed at the window, and a self-checking assembly is arranged at the rear end of the floating detection assembly; the base assembly comprises a first sleeve, two sliding grooves are symmetrically formed in the inner wall of the first sleeve along the axial direction, and a fixed grid reading head is arranged outside the window; the floating detection assembly comprises a second sleeve and a probe main shaft coaxially arranged in the second sleeve, a step is arranged on the inner wall of the second sleeve, an end head is arranged at the front end of the probe main shaft, a gear rack is arranged on one side of the outer wall of the second sleeve, and two convex edges are symmetrically arranged; each convex edge is clamped into the sliding groove; through the cooperation of the base assembly and the floating detection assembly, the problems of false connection misjudgment, plug-in depth detection precision dispersion and contact determination signal interference in the transformer wiring detection process are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of transformer testing tooling technology, specifically a sensor for transformer wiring positioning and testing. Background Technology

[0002] Sensors used for transformer wiring positioning and testing serve as the core front-end positioning device for transformer electrical performance testing. They are key units that determine the accuracy of test data, the yield rate of wiring processes, and the overall testing efficiency.

[0003] Existing sensors for transformer wiring positioning detection mostly employ a technical approach that combines main circuit continuity judgment, built-in limit switch triggering, and external visual displacement auxiliary detection. The main circuit continuity type relies on the continuity signal of the test circuit to determine the wiring's position; the built-in limit switch type relies on the mechanical contact's on / off state to output a position indicator; and the external visual displacement type relies on optical imaging and algorithmic calculation to output real-time position data. However, under conditions of frequent transformer model changes, fluctuations in pin stamping and welding dimensional consistency, and large dispersion in the insertion stroke at the wiring position, these technical approaches have the following limitations: the main circuit continuity type lacks the ability to differentiate contact quality, and the sensors are effective even when the pin surface is oxidized, contaminated, or has a loose connection. It is prone to misjudgment and cannot effectively identify invalid contacts; the trigger threshold of the built-in limit switch is a factory-preset fixed value, and the compatibility of different pin specifications is poor. Transmission gaps and mechanical wear can easily cause the trigger threshold to drift. Under withstand voltage test conditions, high and low voltage crosstalk can easily interfere with the stability of the switch signal; external visual displacement detection relies on optical acquisition and processing, and the response speed is limited by the algorithm time. On-site metal dust and oil can easily contaminate optical components and cause detection deviations. Moreover, the overall size is large and it is difficult to adapt to multi-station parallel detection scenarios with dense pins; mechanical wear and strong electromagnetic environment caused by long-term high-frequency reciprocating operation will accelerate the performance degradation and failure of detection components and electrical interfaces. Summary of the Invention

[0004] The purpose of this invention is to provide a sensor for transformer wiring location detection, in order to solve the problems mentioned in the background art, such as the inability to distinguish light touch and loose connection states in the main circuit on / off determination, the easy distortion of test results, the easy drift of the built-in trigger switch threshold and the susceptibility of the signal to crosstalk under strong electromagnetic conditions, as well as the inherent contradiction between detection accuracy, structural integration and environmental adaptability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a sensor for transformer wiring positioning detection, including a base assembly and a floating detection assembly coaxially nested inside the base assembly. The base assembly has a window on its side wall, a transmission mechanism is installed at the window, and a self-testing assembly is provided at the rear end of the floating detection assembly. The base assembly includes a first sleeve, the inner wall of which has two symmetrically opened sliding grooves along the axial direction, and a fixed grid reading head is provided on the outer side of the window; The floating detection assembly includes a second sleeve and a probe spindle coaxially inserted therein. The inner wall of the second sleeve is provided with a step, and the front end of the probe spindle is provided with an end. One side of the outer wall of the second sleeve is provided with a rack and two symmetrical protrusions. Each protrusion is inserted into a sliding groove. A wave spring and a top ball are radially embedded on the opposite side of the rack on the outer wall of the second sleeve. The top ball abuts against the inner wall of the first sleeve. The transmission mechanism includes a rotating shaft, a gear and a moving magnetic grating disk fixed thereon, the gear meshing with a rack, and a fixed grating read head corresponding to the moving magnetic grating disk is provided on the outside of the window; The self-testing component includes an insulating base, an inner ring spring, and an outer ring spring, with the inner ring spring facing the tail of the probe spindle.

[0006] Preferably, the upper part of the probe spindle is provided with a second boss, and the first spring is coaxially sleeved on the outside of the probe spindle, with its two ends abutting against the second boss and the step respectively, and applying a forward preload force to the probe spindle.

[0007] Preferably, a bushing is press-fitted to the front end of the first sleeve, and an end cap is screwed onto the rear end. The end protrudes from the bushing. A second spring is abutted against the top end of the second sleeve, and the other end of the second spring abuts against the inside of the end cap.

[0008] Preferably, bearings are embedded in the two side walls of the window, the two ends of the rotating shaft are rotatably supported in the two bearings, a first boss is provided on the outer side of the window, and the fixed grid reading head is fixed on the surface of the first boss, maintaining a uniform air gap with the moving magnetic grid disk.

[0009] Preferably, the insulating base has a through hole at its center, the insulating base is fixed to the top of the second sleeve, and the second spring is located on the outside of the insulating base. The inner wall of the through hole is provided with an annular support platform, and the outer ring of the inner ring spring is placed on the support platform with the arched end facing the probe spindle side.

[0010] Preferably, the outer ring spring is an annular disc structure. The outer ring of the outer ring spring is fixed to the top surface of the insulating base, and the free edge of the inner ring arches downward. Under normal conditions, there is a radial gap between the outer edge of the inner ring spring and the inner edge of the outer ring spring. When the inner ring spring is compressed and unfolded, the outer edge expands outward and fits and conducts with the outer ring spring.

[0011] Preferably, the inner wall of the second sleeve is provided with two guide sleeves, the two guide sleeves are clearance fit with the probe spindle, the probe spindle body is provided with a guide flat part, and the second sleeve and one of the guide sleeves are radially provided with a positioning pin, the end of the positioning pin abutting against the guide flat part.

[0012] Preferably, the two guide sleeves are respectively disposed at the front end and the rear end of the inner wall of the second sleeve, completely avoiding the sliding range of the first spring and the second boss, forming a double-support radial support.

[0013] Preferably, a protective housing is provided on the outside of the window, which covers the outside of the moving magnetic grating disk and the fixed grating reading head and is fixed to the outer wall of the first sleeve by bolts.

[0014] Compared with the prior art, the beneficial effects of the present invention are: In this invention, the coordinated operation of the base component and the floating detection component effectively improves the problems of misjudgment of loose connections, discrete insertion depth detection accuracy, and interference with contact judgment signals during transformer wiring detection. In the base component, the first sleeve forms a regular installation reference based on the sliding groove and window; the bushing guides and corrects the probe tip; the end cover and housing respectively form a dustproof and sensor protection structure at the tail, providing a stable working environment for internal floating motion and precision detection. In the floating detection component, the second sleeve achieves axially stable floating through the sliding engagement of the convex ridge and the sliding groove; the wave spring and the top ball continuously apply radial preload to the rack, eliminating the transmission gap between the rack and gear meshing, reducing the return error of insertion depth detection; the transmission mechanism carries… The moving magnetic grating disk rotates synchronously, working with the fixed grating read head to achieve continuous quantitative acquisition of wiring insertion depth. In the self-test component, the inner and outer spring contacts are pressed together by the tail of the probe spindle at the set insertion depth, and a contact signal is output in a mechanical threshold manner. The two systems work together to verify, which not only makes the insertion depth data traceable, but also avoids the interference of strong electromagnetic environment on electronic detection signal. The guide sleeve, positioning pin and guide flat part work together to constrain the circumferential offset of the probe spindle, so that the end contact direction is stable and the tail end face is always aligned with the center of the inner spring contact. The first spring and the second spring form a two-stage floating reset structure to adapt to the pin size fluctuation, reduce mechanical wear and detection deviation during long-term high-frequency operation, and improve the consistency and working condition adaptability of transformer wiring positioning detection. Attached Figure Description

[0015] Figure 1 This is a perspective view of the main structure in this invention; Figure 2 This is a three-dimensional cross-sectional view of the structure in this invention; Figure 3 This is a schematic diagram of the mounting position structure of the base component in this invention; Figure 4 This is a schematic diagram of the installation position structure of the floating detection component in this invention; Figure 5 for Figure 4 Enlarged detail image of point A in the middle; Figure 6 This is a schematic diagram of the structure of the end cap, guide flat section, and positioning pin in this invention; Figure 7This is a schematic diagram of the wave spring and the top bead in this invention; Figure 8 for Figure 7 Enlarged detail of section B in the middle.

[0016] In the diagram: 100, base assembly; 101, first sleeve; 102, bushing; 103, end cap; 104, slide groove; 105, window; 106, housing; 200, floating detection assembly; 201, second sleeve; 202, protruding ridge; 203, transmission mechanism; 2031, rack; 2032, bearing; 2033, rotating shaft; 2034, gear; 2035, moving magnetic grating disk; 2036, first boss; 2 037. Fixed grid reader; 204. Wave spring; 205. Top ball; 206. Self-test assembly; 2061. Base; 2062. Support platform; 2063. Inner ring spring; 2064. Outer ring spring; 207. Probe spindle; 208. End; 209. Guide flat part; 210. Positioning pin; 211. Guide sleeve; 212. Second boss; 213. Step; 214. First spring; 215. Second spring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1-2 As shown, this embodiment provides a sensor for transformer wiring positioning detection, including a base assembly 100 and a floating detection component 200 coaxially nested inside the base assembly 100; the base assembly 100 has a window 105 on its side wall, such as... Figure 4 As shown, a transmission mechanism 203 is installed at window 105, such as... Figure 7 As shown, the floating detection component 200 has a self-testing component 206 at the rear end; the overall sensor is arranged along the vertical axis, with the front end connecting to the pin of the transformer under test, the middle floating structure completing the insertion depth quantification detection and contact completion determination, and the rear end leading out the main test lead and the sensing signal line respectively. The structure of pure mechanical transmission combined with passive magnetic grating sensing is suitable for the strong electromagnetic, dusty and oily, and high-frequency reciprocating operation conditions of transformer high voltage testing scenarios, which helps to reduce the impact of false connection misjudgment on test data, and at the same time facilitates in-situ replacement and installation on existing needle bed tooling.

[0019] like Figure 3As shown, the base assembly 100 includes a first sleeve 101, which is made of annealed 304 non-magnetic stainless steel and is a hollow elongated cylindrical rotating body to avoid magnetic field interference to the magnetic grating sensing element. Two axially symmetrical grooves 104 are milled on the inner wall of the first sleeve 101. The grooves 104 have rectangular cross-sections, and their depth does not exceed half the thickness of the sleeve wall. The outer wall maintains a complete cylindrical surface. A mounting platform is machined on the inner wall of the front end of the first sleeve 101, and a bushing 102 is press-fitted thereon. The bushing 102 is made of... Made of polytetrafluoroethylene, the front end has a tapered guide port, which is fixed by interference fit. The tapered port faces outward, and the inner hole is clearance-fitted with the probe spindle 207 rod body, which plays a role in guiding and correcting the connection pin and preventing dust at the front end. The outer wall of the rear end of the first sleeve 101 is machined with external threads and screwed with an end cap 103. The end cap 103 is a circular end cap with internal threads, with a wire hole in the center and a silicone buffer pad attached to the inside, which can limit the maximum backward stroke of the floating detection component 200 and at the same time provide a lead-out channel for various internal wires.

[0020] like Figures 4-5 As shown, the floating detection component 200 includes a second sleeve 201, which is made of brass and is a hollow, thin-walled cylindrical part. It is coaxially nested within the internal cavity of the first sleeve 101. One side of the outer wall of the second sleeve 201 is machined with an axially oriented straight-tooth rack 2031. The rack 2031 is sequentially divided into a front limiting section, an effective tooth section, and a rear limiting section along the axial direction. The effective tooth section is a continuous straight tooth, while the two limiting sections are smooth, toothless surfaces with smooth transitions between sections. Two axial protrusions 202 are machined on the symmetrical side of the outer wall. Each protrusion 202 corresponds to a groove 104 on the inner wall of the first sleeve 101. The clearance on one side is controlled between 0.01mm and 0.02mm, restricting the circumferential rotation of the second sleeve 201 while retaining axial sliding freedom. Figures 6-7 As shown, the outer wall of the second sleeve 201, corresponding to the opposite side of the rack 2031, has at least three radial blind holes machined at intervals along the axial direction. These holes are evenly spaced along the axial direction. Wave springs 204 and top balls 205 are sequentially installed in the blind holes. The top balls 205 are made of polytetrafluoroethylene. Under the thrust of the wave springs 204, the top balls 205 always press against the inner wall of the first sleeve 101, applying a continuous radial bias force to the second sleeve 201. This forces the tooth surface of one side of the rack 2031 to always be in close contact with the tooth surface of the gear 2034, thus eliminating the tooth side transmission backlash from a structural perspective. In this embodiment, the inner wall of the second sleeve 201 is provided with an inwardly protruding annular step 213 near the rear end. The step 213 has a rectangular cross-section and serves as the rear end limiting surface of the first spring 214. The step 213 divides the inner cavity of the second sleeve 201 into a front spring cavity and a rear guide cavity. The two cavities are not connected to each other to avoid interference between the spring movement and the guide section.

[0021] like Figures 4-5As shown, the transmission mechanism 203 is installed at the window 105 on the side wall of the first sleeve 101. The window 105 is a regular rectangular through opening. A miniature deep groove ball bearing 2032 is press-fitted onto each of the two side walls. The outer rings of the two bearings 2032 are interference-fitted with the side wall of the window 105, and the inner rings together support a rotating shaft 2033, forming a double-support simply supported structure to eliminate the radial movement of the rotating shaft 2033. A gear 2034 is press-fitted onto the middle of the rotating shaft 2033 through an interference fit. The gear 2034 is a spur gear and maintains constant mesh with the rack 2031. One end of the rotating shaft 2033 extends out of the outer wall of the first sleeve 101 through an interference fit. The device is press-fitted with a moving magnetic grid disk 2035. The moving magnetic grid disk 2035 is an ultra-thin circular disc, made of samarium cobalt permanent magnet material. The disk surface is magnetized along the circumference to form a 12-bit absolute magnetic coding pattern. The outer layer is protected by epoxy resin encapsulation. A planar first protrusion 2036 is integrally processed on the outer side of the window 105. A fixed grid read head 2037 is fixed to the surface of the first protrusion 2036 by bonding. The fixed grid read head 2037 is a surface-mount magnetoresistive sensor chip with a built-in magnetoresistive sensor array and signal processing circuit. Its sensing surface faces the disk surface of the moving magnetic grid disk 2035. The two are coaxial in center and parallel in disk surface, with a uniform air gap of 0.1mm to 0.2mm between them, without physical contact.

[0022] When the second sleeve 201 slides axially, the rack 2031 drives the gear 2034 to rotate in place, the rotating shaft 2033 and the moving magnetic grating disk 2035 rotate synchronously, the fixed grating reading head 2037 senses the magnetic field change in real time and outputs the absolute position signal corresponding to the axial displacement, so as to realize the continuous quantitative detection of the insertion depth.

[0023] like Figures 7-8 As shown, the self-test component 206 is coaxially mounted on the rear end face of the second sleeve 201 and moves axially reciprocating synchronously with the second sleeve 201. The self-test component 206 includes an insulating base 2061, an inner ring spring 2063, and an outer ring spring 2064. The insulating base 2061 is a circular thin sheet made of polyimide material, with a through hole at the center that is wider at the top and narrower at the bottom. The inner wall of the through hole forms a ring support 2062. The top surface of the insulating base 2061 is machined with an outer ring pad, and the platform surface of the support 2062 is the inner ring pad. The two pads are completely isolated by an insulating gap. The back of the insulating base 2061 is coaxially bonded to the rear end face of the second sleeve 201 with high-temperature resistant epoxy resin adhesive, and the central through hole is directly opposite the axis of the probe spindle 207.

[0024] The inner ring spring 2063 is a solid, shallow dish-shaped thin sheet made of beryllium copper alloy with a gold-plated surface. The outer ring has a flat supporting edge and is mounted on the support platform 2062, with the arched end facing the tail of the probe spindle 207. The outer ring spring 2064 is also made of beryllium copper alloy with a gold-plated surface and has an annular dish structure. The fixed edge of the outer ring is welded to the outer ring pad on the top surface of the insulating base 2061, and the free edge of the inner ring arches downward, surrounding the outer ring spring 2063. Under normal conditions, the outer edge of the inner ring spring 2063 and the outer ring spring 2064 are adjacent to each other. A radial gap of 0.15mm to 0.2mm is maintained between the inner edges. The two are electrically insulated from each other, and the self-test circuit is in the off state. The outer edge of the inner ring spring 2063 and the inner edge of the outer ring spring 2064 are both arc-shaped surfaces in the same direction. When the probe spindle 207 retracts to the set insertion depth and the tail end face presses the inner ring spring 2063 to flatten it, the outer edge of the inner ring spring 2063 expands outward and forms arc-shaped line contact with the inner edge of the outer ring spring 2064. The self-test circuit is turned on and outputs a contact signal to the outside.

[0025] The inner ring spring 2063 and the outer ring spring 2064 are each welded with a silver-plated polytetrafluoroethylene insulated wire. The two wires run along the wire groove on the outer wall of the second sleeve 201 and are led out separately from the wire hole of the end cover 103. They are completely electrically isolated from the main test wire of the probe spindle 207, forming an independent contact self-test circuit.

[0026] like Figures 6-7 As shown, the probe spindle 207 is made of beryllium copper alloy and has a gold-plated surface. It has a slender coaxial rod structure. The front end is provided with a crown-shaped multi-point contact end 208, which extends out of the bushing 102 to form multi-point low-resistance contact with the pins of the transformer under test. The upper middle part is provided with a ring-shaped second boss 212, which serves as the front limiting surface of the first spring 214. The tail rod has a flat guide flat 209 machined along the axial direction on one side. The end is a flat circular end face with an area slightly larger than the arched area of ​​the inner ring spring 2063, which is directly opposite the center of the inner ring spring 2063.

[0027] The first spring 214 is a thin-diameter cylindrical helical compression spring made of stainless steel wire. It is coaxially mounted on the outside of the probe spindle 207, with its front end abutting against the lower end face of the second boss 212 and its rear end abutting against the step 213 on the inner wall of the second sleeve 201. It has a pre-compression amount during assembly and always applies a forward pre-tightening force to the probe spindle 207 to provide a stable initial contact pressure for the end 208.

[0028] The second spring 215 is a large-diameter cylindrical helical compression spring with a wire diameter and stiffness greater than the first spring 214. Its inner diameter is greater than the outer diameter of the self-test assembly 206. It is coaxially fitted around the self-test assembly 206, with its front end abutting against the outer edge of the rear end face of the second sleeve 201 and its rear end abutting against the silicone buffer pad inside the end cap 103. It also has a pre-compression amount during assembly. The elastic force of the second spring 215 can overcome the sliding friction force and push the second sleeve 201 forward back to its initial position after the test.

[0029] like Figure 6 As shown, two guide sleeves 211 are embedded in the inner wall of the second sleeve 201. The two guide sleeves 211 are respectively located at the front end and the rear end of the inner wall of the second sleeve 201, completely avoiding the sliding range of the first spring 214 and the second boss 212, forming a double-support radial support layout. The guide sleeves 211 are made of PEEK material and are hollow thin-walled cylindrical structures. The inner hole is clearance-fitted with the probe spindle 207 rod body, with the clearance on one side controlled between 0.005mm and 0.01mm. The outer wall is interference-fitted with the inner wall of the second sleeve 201. The front end of the guide sleeve 211 is located at the front end of the second sleeve 201. The guide sleeve 211 and the second sleeve 201 are radially provided with a positioning pin 210. The positioning pin 210 is made of polyimide insulating material, and its inner end face is in contact with the plane of the guide flat part 209. The guide flat part 209 extends axially along the main shaft and its length covers the sliding range of the front guide sleeve 211. It can always cooperate with the positioning pin 210 within the entire sliding range of the main shaft, restricting the circumferential rotation of the probe main shaft 207, so that the contact direction of the end 208 remains stable and the tail end face is always directly facing the center area of ​​the inner ring spring piece 2063.

[0030] like Figure 3 As shown, a protective housing 106 is provided on the outside of the window 105. The protective housing 106 is made of PPS engineering plastic and has a micro-thin shell structure. It is fixed to the outer wall of the first sleeve 101 by stainless steel micro bolts of M1.2 to M1.6 specifications. The protective housing 106 completely covers the moving magnetic grid disk 2035 and the fixed grid reading head 2037 inside. A safety gap of not less than 0.2mm is maintained between the inner wall of the housing 106 and the moving magnetic grid disk 2035 and the fixed grid reading head 2037, so that it does not contact any moving parts and sensing surfaces. It can prevent external dust, oil and metal debris from entering the air gap area of ​​the magnetic grid assembly, and at the same time complete the structural protection continuity of the first sleeve 101 at the window 105.

[0031] The assembly sequence in this embodiment is as follows: First, press the two bearings 2032 into the bearing 2032 holes on both sides of the window 105; press the gear 2034 and the moving magnetic grating disk 2035 into the corresponding positions of the rotating shaft 2033; then insert the rotating shaft 2033 into the inner hole of the bearing 2032 to complete the assembly of the transmission mechanism 203; install the wave spring 204 and the top ball 205 into the radial blind hole on the outer wall of the second sleeve 201 in sequence; press the two guide sleeves 211 into the corresponding positions of the front end and the rear end of the inner wall of the second sleeve 201; put the first spring 214 into the probe spindle 207, and then insert the probe spindle 207 into the inner hole of the second sleeve 201, so that the two ends of the first spring 214 abut against the second boss 212 and the step 213 respectively; and then install the positioning pin 2... 10 is inserted into the pin holes of the second sleeve 201 and the front guide sleeve 211, so that its inner end face is against the guide flat part 209; the insulating base 2061, together with the welded inner ring spring 2063, outer ring spring 2064 and lead wire, is coaxially bonded to the rear end face of the second sleeve 201; the assembled floating detection component 200 is installed into the inner cavity of the first sleeve 101, so that the protrusion 202 is engaged with the slide groove 104, and the rack 2031 meshes with the gear 2034; the second spring 215 is sleeved into the tail of the second sleeve 201, and the end cover 103 is screwed on; the fixed grid reading head 2037 is bonded to the surface of the first boss 2036, the protective housing 106 is covered and fixed with bolts; finally, the bushing 102 is pressed into the front end of the first sleeve 101 to complete the assembly of the whole machine.

[0032] In this embodiment, the working process is as follows: In the initial state, the second spring 215 pushes the second sleeve 201 to the front limit position, the first spring 214 pushes the probe spindle 207 forward to its longest length, the end 208 extends out of the bushing 102, a gap is left between the tail end face of the probe spindle 207 and the inner ring spring 2063, the self-test circuit is disconnected, and the fixed grid reading head 2037 outputs the zero-point reference signal.

[0033] As the probe is pressed down at the test station, the tapered guide port of the bushing 102 first contacts the transformer pin under test, radially correcting the skewed pin and guiding the end 208 to be precisely centered. After the end 208 contacts the pin surface, the probe spindle 207 is pushed upward and backward by the reaction force, independently compressing the first spring 214. During this stage, only the probe spindle 207 moves, the second sleeve 201 remains stationary, the magnetic grating reading remains unchanged, and the spring is not triggered. The flexible compression of the first spring 214 is used to buffer the pin height difference and gradually establish a stable contact pressure.

[0034] When the first spring 214 is compressed to the set pressure, the spring force is transmitted to the second sleeve 201 through the step 213, pushing the second sleeve 201 to slide upward synchronously; the rack 2031 on the outer wall of the second sleeve 201 drives the gear 2034 and the rotating shaft 2033 to rotate, the moving magnetic grating disk 2035 rotates synchronously, the fixed grating reading head 2037 collects the rotation angle signal in real time and converts it into the axial insertion depth value, and continuously outputs it to the external tester; during this process, the wave spring 204 and the top ball 205 continuously apply radial bias force to keep the tooth surface of the rack 2031 on one side and the tooth surface of the gear 2034 in close contact, eliminating the transmission backlash.

[0035] When the insertion depth reaches the preset qualified threshold, the tail end face of the probe spindle 207 presses against the inner ring spring 2063. After the inner ring spring 2063 is flattened, its outer edge expands outward and fits against the inner arc surface of the outer ring spring 2064, and the self-test circuit is activated. The external tester simultaneously receives two signals: the insertion depth value is qualified and the self-test circuit is activated. It determines that the wiring positioning and contact quality are qualified and starts the formal electrical parameter test. The cooperation between the positioning pin 210 and the guide flat part 209 ensures that the probe spindle 207 does not deflect circumferentially during this process, the tail end face is always directly facing the center of the inner ring spring 2063, the spring is subjected to uniform force, and the trigger threshold is stable.

[0036] After the test, the test station rises, the external pressure is removed, the first spring 214 pushes the probe spindle 207 forward, the inner ring spring 2063 returns to its original position by its own elasticity, and separates from the outer ring spring 2064, the self-test circuit is disconnected; the second spring 215 simultaneously pushes the second sleeve 201 to slide forward as a whole, returning to the initial front end limit position, the fixed grid reading head 2037 returns to zero, waiting to enter the next test cycle.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sensor for transformer wiring positioning detection, comprising a base assembly (100) and a floating detection assembly (200) coaxially nested inside the base assembly (100), characterized in that: The base component (100) has a window (105) on its side wall, a transmission mechanism (203) is installed at the window (105), and a self-testing component (206) is provided at the rear end of the floating detection component (200). The base assembly (100) includes a first sleeve (101), and the inner wall of the first sleeve (101) is symmetrically provided with two sliding grooves (104) along the axial direction. The floating detection component (200) includes a second sleeve (201) and a probe spindle (207) coaxially inserted therein. The inner wall of the second sleeve (201) is provided with a step (213). The front end of the probe spindle (207) is provided with an end (208). A rack (2031) is provided on one side of the outer wall of the second sleeve (201), and two symmetrical protrusions (202) are provided. Each protrusion (202) is correspondingly inserted into a sliding groove (104). A wave spring (204) and a top ball (205) are radially embedded on the outer wall of the second sleeve (201) on the opposite side of the rack (2031). The top ball (205) abuts against the inner wall of the first sleeve (101). The transmission mechanism (203) includes a rotating shaft (2033), a gear (2034) fixed thereon, and a moving magnetic grid disk (2035). The gear (2034) meshes with a rack (2031). A fixed grid reading head (2037) corresponding to the moving magnetic grid disk (2035) is provided on the outside of the window (105). The self-testing component (206) includes an insulating base (2061), an inner ring spring (2063), and an outer ring spring (2064), with the inner ring spring (2063) facing the tail of the probe spindle (207). The probe spindle (207) has a second boss (212) in the upper part, and a first spring (214) is coaxially sleeved on the outside of the probe spindle (207), with its two ends abutting against the second boss (212) and the step (213) respectively, and applying a forward preload force to the probe spindle (207); The first sleeve (101) has a bushing (102) pressed onto its front end and an end cap (103) screwed onto its rear end. The end (208) extends out of the bushing (102). The top of the second sleeve (201) abuts against a second spring (215), and the other end of the second spring (215) abuts against the inside of the end cap (103). The outer ring spring (2064) is a ring-shaped disc structure. The outer ring of the outer ring spring (2064) is fixed to the top surface of the insulating base (2061). The free edge of the inner ring arches downward. Under normal conditions, there is a radial gap between the outer edge of the inner ring spring (2063) and the inner edge of the outer ring spring (2064). When the inner ring spring (2063) is compressed and unfolded, its outer edge expands outward and fits and conducts with the outer ring spring (2064).

2. The sensor for transformer wiring positioning detection according to claim 1, characterized in that: Bearings (2032) are embedded in the two side walls of the window (105). The two ends of the rotating shaft (2033) are rotatably supported in the two bearings (2032). A first boss (2036) is provided on the outside of the window (105). The fixed grid reading head (2037) is fixed on the surface of the first boss (2036) and maintains a uniform air gap with the moving magnetic grid disk (2035).

3. The sensor for transformer wiring positioning detection according to claim 1, characterized in that: The insulating base (2061) has a through hole in the center. The insulating base (2061) is fixed to the top of the second sleeve (201), and the second spring (215) is located on the outside of the insulating base (2061). The inner wall of the through hole is provided with an annular support platform (2062). The outer ring of the inner ring spring piece (2063) is placed on the support platform (2062), and the arched end faces the probe spindle (207).

4. The sensor for transformer wiring positioning detection according to claim 1, characterized in that: The inner wall of the second sleeve (201) is fitted with two guide sleeves (211). The two guide sleeves (211) are clearance-fitted with the probe spindle (207). The probe spindle (207) has a guide flat part (209) on its shaft. The second sleeve (201) and one of the guide sleeves (211) are radially fitted with a positioning pin (210). The end of the positioning pin (210) is attached to the guide flat part (209).

5. The sensor for transformer wiring positioning detection according to claim 4, characterized in that: The two guide sleeves (211) are respectively located at the front end and the rear end of the inner wall of the second sleeve (201), completely avoiding the sliding range of the first spring (214) and the second boss (212), forming a double-support radial support.

6. The sensor for transformer wiring positioning detection according to claim 1, characterized in that: The window (105) is provided with a protective shell (106) on the outside. The protective shell (106) covers the outside of the moving magnetic grid disk (2035) and the fixed grid reading head (2037) and is fixed to the outer wall of the first sleeve (101) by bolts.

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