Test tool for eddy current sensor

Abstract

The invention discloses a test tool for an eddy current sensor in the field of sensor detection, and the test tool comprises a bottom plate, the bottom plate is provided with a plurality of parallel transverse raised lines, the bottom plate is provided with a positioning mechanism corresponding to each raised line, the positioning mechanism comprises a plurality of groups of positioning assemblies which are distributed at intervals along the length direction of the corresponding raised lines, and the positioning assemblies are arranged on the bottom plate. Each positioning assembly comprises a positioning groove and a fixing block which are located on the front side and the rear side of the corresponding protruding strip respectively, the eddy current sensor comprises a stator, a rotor and a cylinder penetrating part, a wire harness is arranged between the stator and the rotor and the cylinder penetrating part, the stator and the rotor are positioned through the positioning grooves, and the cylinder penetrating part is positioned through the fixing blocks. And the wire harness is wired from the upper side of the raised line and is connected with the raised line through a plurality of positioning buckles. The test tool is a universal test tool, light-weight design is carried out while test strength and characteristics are considered, and the requirement for online monitoring of the amplitude of the sensor is met.

Description

Technical Field

[0001] This invention belongs to the field of sensor detection, and specifically relates to a test fixture for eddy current sensors. Background Technology

[0002] As a core motor component, eddy current sensors typically require one to two rounds of DV and PV tests. Durability tests, such as vibration tests, high and low temperature durability tests, and oil immersion tests, usually need to be completed for 1,000 to 2,000 hours, and the amplitude fluctuation of the eddy current signal needs to be monitored during the test.

[0003] The existing eddy current sensor test fixtures have the following disadvantages: (1) The existing eddy current sensor test fixtures have low compatibility. For different tests, such as vibration test, high and low temperature durability test, oil immersion test, etc., multiple fixtures are required. The functions are not centralized, they are not compatible, and the versatility is poor. (2) It is impossible to monitor the amplitude fluctuation of the eddy current signal during the test. (3) The structure is too complex and bulky, and it cannot meet the requirements of lightweighting. Summary of the Invention

[0004] The purpose of this invention is to provide a test fixture for eddy current sensors, which can monitor the amplitude fluctuation of eddy current signals during the test. A general-purpose test fixture is designed for the performance test of eddy current sensors, which takes into account the test intensity and characteristics while being lightweight, and meets the requirements for online monitoring of sensor amplitude.

[0005] The objective of this invention is achieved as follows: A test fixture for an eddy current sensor includes a base plate with several parallel transverse ridges. A positioning mechanism is provided on the base plate for each ridge. The positioning mechanism includes several sets of positioning components spaced apart along the length of the corresponding ridge. Each set of positioning components includes a positioning groove and a fixing block located on the front and rear sides of the corresponding ridge. The eddy current sensor includes a stator and a rotor and a cylinder-through component. A wire harness is provided between the stator and the rotor and the cylinder-through component. The stator and rotor are positioned by the positioning grooves, and the cylinder-through component is positioned by the fixing blocks. The wire harness runs from the upper side of the ridge and is connected to the ridge by several positioning clips.

[0006] In use, this invention involves fixing several rows of eddy current sensors along the raised strips on the base plate. Each eddy current sensor consists of a stator and rotor connected by a wire harness and a cylinder-penetrating component. The stator, rotor, and cylinder-penetrating component of two adjacent eddy current sensors in each row are arranged in opposite directions, achieving a staggered arrangement of eddy current sensors for a more rational layout and space saving. The cylinder-penetrating component is fixed by a fixing block on the base plate. The rotor component is fitted into the lower slot and fixed with bolts, while the stator component is fitted into the upper slot and fixed with bolts. The stator component is positioned by an embedded slot. The axes of the rotor component, stator component, central boss, lower slot, and main slot are all coincident. The wire harness is positioned with the raised strips by positioning buckles, and the raised strips support the wire harness, simulating the force exerted on the wire harness by the corresponding test environment. The base plate can be fixed to the test bench by bolts passing through the countersunk fixing holes to simulate the vibration test environment, or the base plate can be directly subjected to durability tests in high and low temperature environments or oil immersion environments. It integrates functions and is compatible.

[0007] When using this invention, the rotor and stator components of multiple eddy current sensors are first installed in the positioning groove along each protrusion, and the cylinder-penetrating component is fixed on the fixing block. The stator and rotor of two adjacent eddy current sensors on each protrusion are arranged in opposite directions with the cylinder-penetrating component. Then, wire harnesses are connected between the corresponding stator components and cylinder-penetrating components.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: the amplitude fluctuation of the eddy current signal can be monitored during the test. A general-purpose test fixture is designed for the performance test of eddy current sensors, which takes into account the test intensity and characteristics while being lightweight, and meets the requirements for online monitoring of sensor amplitude.

[0009] As a further improvement of the present invention, the positioning groove is formed on the base plate, and the depth of the positioning groove is less than the thickness of the base plate. The positioning groove includes an upper groove and a lower groove. The upper groove includes a main groove and an embedded groove that are interconnected. The depth of the embedded groove is greater than the depth of the main groove. The outer periphery of the main groove is arc-shaped, the embedded groove is rectangular, and the outer periphery of the lower groove is circular. The central axis of the main groove and the lower groove coincide. The main groove is vertically located above the lower groove. The inner diameter of the main groove is equal to the outer diameter of the lower groove. Three side bosses are provided on the bottom wall of the lower end of the main groove, which are spaced apart circumferentially. A central boss is provided at the center of the bottom wall of the lower end of the lower groove. The radial distance between each side boss and the central boss is equal. The rotor component is fitted onto the central boss in the lower groove and fixed to the central boss with bolts. The stator component is positioned and fixed on the main groove to the three side bosses with bolts.

[0010] As a further improvement of the present invention, both the side bosses and the central boss are circular. A through hole (I) is vertically formed at the center of the side boss, penetrating the base plate. A through hole (II) is vertically formed at the center of the central boss, penetrating the base plate. Both through holes (I and II) have threads on their inner walls. The side bosses are evenly spaced circumferentially around the central boss. Bolts connected to through holes (II) secure the rotor component, and bolts connected to through holes (I) secure the stator component.

[0011] As a further improvement of the present invention, the side bosses are flush with the upper surface of the base plate, and the height of the upper surface of the central boss is lower than the height of the lower end wall of the main body groove. The lower surface of the stator component on each side boss is flush with the upper surface of the base plate.

[0012] As a further improvement of the present invention, the base plate is rectangular, and each fixing block of the positioning component on the base plate has a row of through holes three spaced apart along the length of the base plate. The inner wall of the through holes three is threaded. The fixing block includes a base plate, and the lower part of the base plate has two horizontally symmetrically distributed support plates. The support plates have vertically through holes. The two support plates are respectively set to correspond to the two through holes three. Each support plate is connected to the base plate by a fastener passing through the corresponding connection hole. The base plate has a positioning hole through the cylinder component. The axis of the positioning hole is parallel to the width direction of the base plate. The outer periphery of the cylinder component has an outer protrusion plate. A rubber ring is sleeved on the cylinder component behind the outer protrusion plate. The cylinder component is set to pass through the positioning hole. The rubber ring is set to correspond to the inner wall of the positioning hole. The outer protrusion plate is set against the base plate. The lower part of the outer protrusion plate is fixed to the base plate by a bolt. The fixing block is fixed to the base plate by fasteners. The cylinder through part is positioned by the positioning hole passing through the fixing block. The outer periphery of the cylinder through part has a groove for installing a rubber ring, and the rubber ring contacts the inner wall of the positioning hole.

[0013] As a further improvement of the present invention, each connecting wire on the wire harness is equipped with a positioning buckle. The positioning buckle includes an outer retaining ring, which is sleeved on the corresponding connecting wire. A connecting bracket is provided on the lower side of the outer retaining ring, and a positioning cap is provided on the lower side of the connecting bracket. A positioning head is connected to the lower side of the positioning cap. A limiting insertion hole is opened on the protrusion corresponding to the positioning head of each positioning buckle. The positioning head is inserted into the corresponding limiting insertion hole, and the positioning cap is supported on the protrusion. Two side grooves with a circumferential distance of 180° are opened on the outer periphery of the positioning head. The outer periphery of the positioning head is correspondingly set with the inner wall of the limiting insertion hole. The wire harness is positioned on the protrusion by the positioning buckle.

[0014] As a further improvement of the present invention, the stator and rotor include independent rotor components and stator components. The wire harness connects the stator component and the cylinder-penetrating component. The rotor component has a through-hole in its center and is installed in the lower slot. The central boss is inserted into the mounting hole with an upward fit. A vertically arranged bolt two is threadedly connected to the through-hole two and presses the rotor component. A washer is provided between the bolt seat of the bolt two and the rotor component. The bolt two passes through the washer. The stator component is supported on three side bosses of the main slot. The lower side of the stator component has a lower protrusion corresponding to the embedding slot. The lower protrusion is fitted into the embedding slot. The outer periphery of the stator component has three side supports corresponding to each side boss. The three side supports are respectively supported on the three side bosses. A through-hole four is opened on the side support. Each side support is threadedly connected to the corresponding through-hole one by a bolt three passing through the corresponding through-hole four. The bolt three presses the side support. The stator component is set corresponding to the upper slot. A gap is left between the washer and the stator component. The bolt two extends into the central hole of the stator component. The stator component is positioned by the lower protrusion and the embedded groove. The stator component is fixed to the side protrusion by the side supports. The bottom wall of the main groove is provided with annular scale lines and scale values ​​around the outer periphery of the rotor component. The position of the rotor component is adjusted according to the scale values ​​to realize quantitative monitoring of the amplitude fluctuation of the eddy current signal.

[0015] As a further improvement of the present invention, three protrusions are provided, and the positioning slots and fixing blocks of two adjacent sets of positioning components along the length of the base plate are arranged in opposite directions on the front and rear sides of the corresponding protrusions. The positioning slot of the left positioning component is close to the fixing block of the right positioning component, and the eddy current sensors are arranged in an alternating manner, which saves more space.

[0016] As a further improvement of the present invention, the base plate is provided with a plurality of countersunk fixing holes arranged in a rectangular array, each countersunk fixing hole being staggered from the positioning grooves and fixing blocks of the protrusions and positioning components. The inner wall of the countersunk fixing holes is provided with threads, and bolts pass through the countersunk fixing holes to fix the base plate to the frame. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0019] Figure 3 This is a schematic diagram of the structure of the present invention.

[0020] Figure 4 for Figure 3 A magnified view of a portion of the image.

[0021] Figure 5 This is a schematic diagram of the structure of the eddy current sensor and the fixed block.

[0022] Figure 6 This is a schematic diagram of the structure of the eddy current sensor and the fixed block.

[0023] Figure 7 This is a schematic diagram of the structure of the rotor component with two bolts for locking.

[0024] Figure 8 This is a schematic diagram of the rotor assembly mounted on the central boss.

[0025] Figure 9 This is a schematic diagram of the rotor and stator components.

[0026] Figure 10 This is a structural schematic diagram of the stator component.

[0027] Figure 11 This is a top view of the present invention.

[0028] Figure 12 for Figure 11 A sectional view along the AA direction.

[0029] Figure 13 for Figure 12 Enlarged view of point B in the middle.

[0030] The components include: 1. Base plate; 2. Raised strip; 3. Positioning groove; 301. Upper groove body; 301a. Main groove; 301b. Embedded groove; 302. Lower groove body; 4. Fixing block; 4a. Stand plate; 4b. Support plate; 5. Stator and rotor; 501. Rotor component; 502. Stator component; 502a. Lower convex body; 502b. Side support; 6. Through cylinder component; 6a. Outer convex plate; 7. Wire harness; 8. Countersunk fixing hole; 9. Positioning buckle; 9a. Outer retaining ring; 9b. Connecting bracket; 9c. Positioning cap; 9d. Positioning head; 10. Side boss; 11. Center boss; 12. Through hole one; 13. Through hole two; 14. Through hole three; 15. Connecting hole; 16. Positioning hole; 17. Rubber ring; 18. Bolt one; 19. Limiting insertion hole; 20. Side groove; 21. Mounting hole; 22. Bolt two; 23. Washer; 24. Through hole four; 25. Bolt three; 26. Center hole. Detailed Implementation

[0031] like Figure 1-13 As shown, a test fixture for an eddy current sensor is provided, including a base plate 1. Several parallel transverse protrusions 2 are provided on the base plate 1. A positioning mechanism is provided on the base plate 1 for each protrusion 2. The positioning mechanism includes several sets of positioning components distributed at intervals along the length direction of the corresponding protrusion 2. Each set of positioning components includes positioning grooves 3 and fixing blocks 4 located on the front and rear sides of the corresponding protrusion 2, respectively. The eddy current sensor includes a stator and rotor 5 and a cylinder-penetrating component 6. A wire harness 7 is provided between the stator and rotor 5 and the cylinder-penetrating component 6. The stator and rotor 5 are positioned by the positioning grooves 3, and the cylinder-penetrating component 6 is positioned by the fixing blocks 4. The wire harness 7 runs from the upper side of the protrusion 2 and is connected to the protrusion 2 by several positioning buckles 9.

[0032] The positioning groove 3 is formed on the base plate 1. The depth of the positioning groove 3 is less than the thickness of the base plate 1. The positioning groove 3 includes an upper groove 301 and a lower groove 302. The upper groove 301 includes a main groove 301a and an embedded groove 301b that are connected to each other. The depth of the embedded groove 301b is greater than the depth of the main groove 301a. The outer periphery of the main groove 301a is arc-shaped, the embedded groove 301b is rectangular, and the outer periphery of the lower groove 302 is circular. The central axis of the main groove 301a and the lower groove 302 are coincident. The main groove 301a is vertically located above the lower groove 302. The inner diameter of the main groove 301a is equal to the outer diameter of the lower groove 302. Three side protrusions 10 are provided on the bottom wall of the lower end of the main groove 301a, which are distributed circumferentially. A central protrusion 11 is provided at the center of the bottom wall of the lower end of the lower groove 302. The radial distance between each side protrusion 10 and the central protrusion 11 is equal. The rotor component 501 is fitted onto the central boss 11 within the lower slot 302 and fixed to the central boss 11 with bolts. The stator component 502 is positioned and fixed to the main slot 301a by bolts to three side bosses 10. Both the side bosses 10 and the central boss 11 are circular. The center of the side boss 10 has a vertical through hole 12 penetrating the bottom plate 1, and the center of the central boss 11 has a vertical through hole 13 penetrating the bottom plate 1. The inner walls of both through holes 12 and 13 are threaded. The side bosses 10 are evenly distributed around the central boss 11 in the circumferential direction. Bolts connected to the through holes 13 fix the rotor component 502, and bolts connected to the through holes 12 fix the stator component 502. The side bosses 10 are flush with the upper surface of the bottom plate 1, and the upper surface of the central boss 11 is lower than the lower bottom wall of the main slot 301a. The lower surface of the stator component 502 on each side boss 10 is flush with the upper surface of the base plate 1.

[0033] The base plate 1 is rectangular. Each fixing block 4 corresponding to a set of positioning components has a row of through holes 14 spaced apart along the length of the base plate 1. The inner wall of each through hole 14 is threaded. The fixing block 4 includes a base plate 4a. The lower part of the base plate 4a has two horizontally symmetrically distributed support plates 4b. Each support plate 4b has a vertically penetrating connecting hole 15. The two support plates 4b are respectively positioned corresponding to the two through holes 14. Each support plate 4b is connected by a connecting hole 15. Fasteners are connected to the base plate 1. A positioning hole 16 is provided on the upright plate 4a corresponding to the cylinder-penetrating component 6. The axis of the positioning hole 16 is parallel to the width direction of the base plate 1. An outer protruding plate 6a is provided on the outer periphery of the cylinder-penetrating component 6. A rubber ring 17 is fitted behind the outer protruding plate 6a on the cylinder-penetrating component 6. The cylinder-penetrating component 6 is positioned to pass through the positioning hole 16. The rubber ring 17 is positioned corresponding to the inner wall of the positioning hole 16. The outer protruding plate 6a is attached to the upright plate 4a. The lower part of the outer protruding plate 6a is fixed to the upright plate 4a by bolt 18. The fixing block 4 is fixed to the base plate 1 by fasteners. The cylinder-penetrating component 6 is positioned by passing through the positioning hole 16 of the fixing block 4. A groove for installing the rubber ring 17 is provided on the outer periphery of the cylinder-penetrating component 6. The rubber ring 17 contacts the inner wall of the positioning hole 16.

[0034] Each connecting wire on the wiring harness 7 is equipped with a positioning buckle 9. The positioning buckle 9 includes an outer retaining ring 9a, which is fitted onto the corresponding connecting wire. A connecting bracket 9b is located on the lower side of the outer retaining ring 9a, and a positioning cap 9c is located on the lower side of the connecting bracket 9b. A positioning head 9d is connected to the lower side of the positioning cap 9c. A limiting insertion hole 19 is opened on the protrusion 2 corresponding to the positioning head 9d of each positioning buckle 9. The positioning head 9d is inserted into the corresponding limiting insertion hole 19, and the positioning cap 9c is supported on the protrusion 2. Two side grooves 20 with a circumferential interval of 180° are opened on the outer periphery of the positioning head 9d. The outer periphery of the positioning head 9d is correspondingly set with the inner wall of the limiting insertion hole 19. The wiring harness 7 is positioned on the protrusion 2 by the positioning buckles 9.

[0035] The stator and rotor 5 include independent rotor components 501 and stator components 502. A wiring harness 7 connects the stator component 502 and the cylinder-penetrating component 6. A mounting hole 21 is formed through the center of the rotor component 501, which is installed in the lower slot 302. A central boss 11 is inserted upwards into the mounting hole 21. A vertically arranged bolt 22 is threaded into the through hole 13 and presses against the rotor component 501. A washer 23 is provided between the bolt seat of the bolt 22 and the rotor component 501, and the bolt 22 passes through the washer 23. The stator component 502 is supported on three side bosses 10 of the main slot 301a. The lower side of the stator component 502 has a corresponding groove 301b. The lower protrusion 502a is fitted into the embedding groove 301b. The stator 502 has three side supports 502b on its outer periphery corresponding to each side protrusion 10. The three side supports 502b are respectively supported on the three side protrusions 10. The side supports 502b have through holes 24. Each side support 502b is threaded to the corresponding through hole 12 by a bolt 25 passing through the corresponding through hole 24. The bolt 25 presses the side support 502b. The stator 502 is correspondingly set with the upper groove 301. There is a gap between the gasket 23 and the stator 502. The bolt 22 extends into the center hole 26 of the stator 502. The stator component 502 is positioned by the lower protrusion 502a and the embedded groove 301b. The stator component 502 is fixed on the side protrusions 10 by the side supports 502b. The bottom wall of the lower end of the main groove 301a is provided with annular scale lines and scale values ​​corresponding to the outer periphery of the rotor component 501. The position of the rotor component 501 is adjusted according to the scale values ​​to realize quantitative monitoring of the amplitude fluctuation of the eddy current signal.

[0036] Three protrusions 2 are provided. Along the length of the base plate 1, two adjacent sets of positioning components are positioned on opposite sides of the corresponding protrusions 2, with the positioning grooves 3 and fixing blocks 4 arranged in opposite directions. The positioning groove 3 of the left positioning component is close to the fixing block 4 of the right positioning component. The eddy current sensors are arranged in a staggered manner, saving space. Several countersunk fixing holes 8 are provided through the base plate 1 in a rectangular array. Each countersunk fixing hole 8 is staggered from each protrusion 2, the positioning groove 3 of the positioning component, and the fixing block 4. The inner wall of the countersunk fixing hole 8 is threaded, and bolts pass through the countersunk fixing hole 8 to fix the base plate 1 to the frame.

[0037] In use, this invention involves positioning and fixing several rows of eddy current sensors along the protrusions 2 on the base plate 1. Each eddy current sensor consists of a stator and rotor 5 connected by a wiring harness 7 and a cylinder-penetrating component 6. The stator and rotor 5 and cylinder-penetrating component 6 of two adjacent eddy current sensors in each row are arranged in opposite directions, achieving a staggered arrangement of eddy current sensors for a more rational layout and space saving. The cylinder-penetrating component 6 is fixed by a fixing block 4 on the base plate 1. The rotor component 501 is fitted and installed in the lower groove 302 and fixed by bolts, while the stator component 502 is fitted and installed on the upper groove 301. The stator component 502 is positioned by the embedded groove 301b after being fixed with bolts. The axes of the rotor component 501, stator component 502, central boss 11, lower groove 302, and main groove 301a are all coincident. The wire harness 7 is positioned with the protrusion 2 by the positioning buckle 9. The protrusion 2 supports the wire harness 7, simulating the force of the wire harness 7 under the corresponding test environment. The base plate 1 can be fixed on the test bench by bolts passing through the countersunk fixing hole 8 to simulate the vibration test environment, or the base plate 1 can be directly subjected to durability tests in high and low temperature environments or in oil immersion environments. It has integrated functions and can be compatible.

[0038] In use, this invention first installs the rotor components 501 and stator components 502 of multiple eddy current sensors sequentially in the positioning grooves 3 along each protrusion 2, and then fixes the cylinder-penetrating component 6 onto the fixing block 4. The stator and rotor components 5 and cylinder-penetrating components 6 of two adjacent eddy current sensors on each protrusion 2 are arranged in opposite directions. Then, a wiring harness 7 is connected between the corresponding stator components 502 and cylinder-penetrating components 6. This invention can monitor the amplitude fluctuation of the eddy current signal during the test. For the performance test of eddy current sensors, a general-purpose test fixture is designed, which balances test intensity and characteristics while being lightweight, and meets the requirements for online monitoring of sensor amplitude.

[0039] This invention is not limited to the above embodiments. Based on the technical solutions disclosed in this invention, those skilled in the art can make some substitutions and modifications to some of the technical features without creative effort, and all such substitutions and modifications are within the protection scope of this invention.

Claims

1. A testing fixture for an eddy current sensor, characterized in that, The device includes a base plate with several parallel transverse ridges. A positioning mechanism is provided on the base plate for each ridge. The positioning mechanism includes several sets of positioning components spaced apart along the length of the corresponding ridge. Each set of positioning components includes a positioning groove and a fixing block located on the front and rear sides of the corresponding ridge. The eddy current sensor includes a stator and a rotor and a cylinder-penetrating component. A wire harness is provided between the stator and the rotor and the cylinder-penetrating component. The stator and rotor are positioned by the positioning groove, and the cylinder-penetrating component is positioned by the fixing block. The wire harness runs from the upper side of the ridge and is connected to the ridge by several positioning buckles.

2. The test fixture for an eddy current sensor according to claim 1, characterized in that, The positioning groove is formed on the base plate, and the depth of the positioning groove is less than the thickness of the base plate. The positioning groove includes an upper groove and a lower groove. The upper groove includes a main groove and an embedded groove that are interconnected. The depth of the embedded groove is greater than the depth of the main groove. The outer periphery of the main groove is arc-shaped, and the embedded groove is rectangular. The outer periphery of the lower groove is circular. The central axis of the main groove and the lower groove are coincident. The main groove is located vertically above the lower groove. The outer diameter of the main groove is greater than the outer diameter of the lower groove. Three side protrusions are provided on the bottom wall of the lower end of the main groove, which are spaced apart along the circumference. A central protrusion is provided at the center of the bottom wall of the lower end of the lower groove. The radial distance between each side protrusion and the central protrusion is equal.

3. The test fixture for an eddy current sensor according to claim 2, characterized in that, Both the side bosses and the central boss are circular. The center of the side bosses has a vertical through hole 1 that penetrates the bottom plate, and the center of the central boss has a vertical through hole 2 that penetrates the bottom plate. The inner walls of both through holes 1 and 2 are threaded. The side bosses are evenly distributed around the central boss in the circumferential direction.

4. The test fixture for an eddy current sensor according to claim 3, characterized in that, The side boss is flush with the upper surface of the base plate, and the height of the upper surface of the central boss is lower than the height of the bottom wall of the main groove.

5. A test fixture for an eddy current sensor according to claims 1-4, characterized in that, The base plate is rectangular. Each fixing block of the positioning assembly on the base plate has a row of through holes three spaced apart along the length of the base plate. The inner wall of the through holes three is threaded. The fixing block includes a base plate. The lower part of the base plate has two horizontally distributed support plates symmetrically arranged on the left and right. The support plates have vertically through holes. The two support plates are respectively set to correspond to the two through holes three. Each support plate is connected to the base plate by a fastener passing through the corresponding connection hole. The base plate has a positioning hole through the cylinder component. The axis of the positioning hole is parallel to the width direction of the base plate. The outer periphery of the cylinder component has an outer protrusion plate. A rubber ring is fitted on the cylinder component behind the outer protrusion plate. The cylinder component is set to pass through the positioning hole. The rubber ring is set to correspond to the inner wall of the positioning hole. The outer protrusion plate is set against the base plate. The lower part of the outer protrusion plate is fixed to the base plate by a bolt.

6. A test fixture for an eddy current sensor according to claims 1-4, characterized in that, Each connecting wire on the wiring harness is equipped with a positioning buckle. The positioning buckle includes an outer retaining ring, which is fitted onto the corresponding connecting wire. A connecting bracket is provided on the lower side of the outer retaining ring, and a positioning cap is provided on the lower side of the connecting bracket. A positioning head is connected to the lower side of the positioning cap. A limiting insertion hole is opened on the protrusion corresponding to the positioning head of each positioning buckle. The positioning head is inserted into the corresponding limiting insertion hole, and the positioning cap is supported on the protrusion.

7. The test fixture for an eddy current sensor according to claim 4, characterized in that, The stator and rotor include independent rotor and stator components. The wiring harness connects the stator component and the cylinder insert. The rotor component has a through-hole in its center and is installed in the lower slot. The central boss is inserted into the mounting hole with an upward engagement. A vertically arranged bolt 2 is threadedly connected to the through-hole 2 and presses the rotor component. A washer is provided between the bolt seat of bolt 2 and the rotor component, and bolt 2 passes through the washer. The stator component is supported on three side bosses of the main slot. The lower side of the stator component has a lower protrusion corresponding to the embedding slot, and the lower protrusion is inserted into the embedding slot. The outer periphery of the stator component has three side supports corresponding to each side boss. The three side supports are supported on the three side bosses respectively. A through-hole 4 is opened on the side support. Each side support is threadedly connected to the corresponding through-hole 1 by a bolt 3 passing through the corresponding through-hole 4. Bolt 3 presses the side support. The stator component is correspondingly arranged in the upper slot. A gap is left between the washer and the stator component. Bolt 2 extends into the central hole of the stator component.

8. A test fixture for an eddy current sensor according to any one of claims 1-4, characterized in that, The convex strip is provided in three parts. The positioning slots and fixing blocks of the two adjacent sets of positioning components along the length of the base plate are arranged in opposite directions on the front and rear sides of the corresponding convex strip.

9. A test fixture for an eddy current sensor according to any one of claims 1-4, characterized in that, The base plate has several countersunk fixing holes arranged in a rectangular array, and each countersunk fixing hole is staggered from the positioning groove and fixing block of each protrusion, positioning component.

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