Test positioning tool for shaft body separation type non-contact angular displacement sensor

Abstract

The utility model discloses a test positioning tool for a shaft body separation type non-contact angular displacement sensor, which comprises a base, a positioning plate, a plurality of supporting columns, a positioning shaft, a positioning column, a pressing plate, a pressing block and a pressing spring, the positioning plate is arranged on the base, the supporting columns are respectively connected with the base and the pressing plate, and the positioning shaft is connected with the pressing block. The positioning shaft penetrates through a center through hole of the base and a center through hole of the positioning plate and is connected with the hole wall of the center through hole of the positioning plate through a bearing, a positioning blind hole is formed in a rotating shaft positioning portion at the upper end of the positioning shaft, the multiple positioning columns are installed on the positioning plate, positioning protruding columns are arranged at the upper ends of the positioning columns, and a guide column is connected to the middle of the upper face of the pressing block. The guide column penetrates through a central through hole of the pressing plate, and the pressure spring is sleeved outside the guide column and located between the pressing plate and the pressing block. According to the utility model, the circumferential and axial positioning installation functions of the sensor main body and the rotating shaft of the shaft body separation type non-contact angular displacement sensor can be realized, and the test and verification of related performance parameters of the product before the product is delivered are facilitated.

Description

Technical Field

[0001] This utility model relates to a testing fixture for non-contact angular displacement sensors, and more particularly to a testing and positioning fixture for shaft-separated non-contact angular displacement sensors. Background Technology

[0002] Non-contact angular displacement sensors refer to angular displacement sensors in which rotating electrical components and stationary electrical components do not come into contact with each other. Examples include magnetic angular displacement sensors and photoelectric angular displacement sensors (i.e., photoelectric encoders). In common non-contact angular displacement sensors, the electrical components are all installed inside the sensor housing.

[0003] A shaft-separated non-contact angular displacement sensor is a new type of non-contact angular displacement sensor in which the rotating shaft and the electrical components that rotate with the shaft are mounted outside the sensor housing. For example, Figure 1 The illustration shows a typical shaft-separated non-contact angular displacement sensor, comprising a sensor body 1, a rotating shaft 3, and a rotating electrical component 2. The sensor body 1 includes a housing (not separately marked in the figure) and a fixed electrical component housed within the housing. The rotating electrical component 2 is mounted on one end of the rotating shaft 3, close to the sensor body 1, and forms a separate structure from the sensor body 1. The housing edge of the sensor body 1 has multiple (three in the figure) protruding lugs with mounting through holes 5. The rotating shaft 3, near the rotating electrical component 2, has a rotating shaft screw hole 4 for connecting to the rotating part of the device under test. The rotating electrical component 2 is chosen based on the specific application, but a magnet (i.e., a permanent magnet) is commonly used. This is equivalent to moving the magnet from inside the housing to outside the housing in traditional magnetic angular displacement sensors, thus achieving shaft separation. This facilitates complete sealing of the sensor body without requiring the rotating shaft 3 to pass through the housing, fundamentally solving the problem of incomplete sealing caused by rotary sealing. This design is suitable for applications requiring extremely high sealing performance.

[0004] For the aforementioned shaft-separated non-contact angular displacement sensor, the coaxiality and axial distance between the rotating shaft 3 and the sensor body 1 are crucial factors directly affecting the sensor's detection accuracy. For example, the axial distance must not exceed 1mm. Due to the lack of testing and positioning fixtures capable of meeting these conditions in traditional technologies, the sensor's performance parameters, such as detection accuracy, lifespan, and vibration resistance, are currently tested and verified only after the sensor is installed by the user. This prevents the relevant performance parameters from being tested and verified before the sensor is delivered to the user, potentially leading to the discovery of issues that fail to meet application requirements during use. This reduces user satisfaction, diminishes the company's reputation, and increases management costs. Utility Model Content

[0005] The purpose of this invention is to provide a testing and positioning fixture for a shaft-separated non-contact angular displacement sensor in order to solve the above-mentioned problems.

[0006] This utility model achieves the above objectives through the following technical solutions:

[0007] A testing and positioning fixture for a shaft-separated non-contact angular displacement sensor includes a base, a positioning plate, support columns, a positioning shaft, a pressure plate, a pressure block, and a compression spring. The base has a vertical central through hole, the positioning plate has a vertical central through hole, and the pressure plate has a vertical central through hole. The positioning plate is mounted on the base. The lower ends of multiple vertical support columns are connected to positions on the base outside the positioning plate, and the upper ends of multiple support columns are connected to positions on the pressure plate near the edge. The vertical positioning shaft passes through the central through hole of the base and the central through hole of the positioning plate, and is connected to the wall of the central through hole of the positioning plate via a bearing. The upper outer diameter of the positioning shaft is enlarged to form a rotating shaft positioning part. The upper center of the rotating shaft positioning part is provided with a positioning blind hole with an open upper end. The hole wall of the positioning blind hole is provided with a radial positioning hole that runs horizontally through it. The positioning plate is provided with a plurality of vertical positioning post mounting holes that are evenly distributed along the circumference outside the central through hole of the positioning plate. The lower ends of the plurality of positioning posts are respectively installed in the plurality of positioning post mounting holes. The upper center of the positioning post is provided with an upwardly protruding positioning protrusion. The upper end face of the positioning protrusion is higher than the upper end face of the rotating shaft positioning part. The lower part of the pressure block is a horizontal plane, and the upper center is connected to an integrally formed vertical guide post. The guide post passes through the central through hole of the pressure plate. The vertical compression spring is fitted outside the guide post and is located between the pressure plate and the pressure block. The pressure block is located directly above the rotating shaft positioning part.

[0008] Preferably, in order to reliably connect the positioning post and the positioning plate, the middle section diameter of the positioning post mounting hole is smaller than the upper and lower section diameters, forming an upper annular step and a lower annular step respectively. The lower end of the positioning post is located above the corresponding upper annular step. The middle part of the lower end of the positioning post is provided with a screw hole with an open lower end. The stud of the first connecting screw passes through the corresponding positioning post mounting hole from bottom to top and connects with the screw hole at the lower end of the corresponding positioning post, and the nut of the first connecting screw is blocked by the corresponding lower annular step.

[0009] Preferably, in order to facilitate adjustment of the upper height of the positioning post as needed, a washer is provided between the lower end of the positioning post and the upper surface of the upper annular step, and the stud of the corresponding first connecting screw passes through the central through hole of the washer. The thickness and number of washers are determined as needed.

[0010] Preferably, in order to facilitate reliable installation of the positioning shaft and ensure that the positioning shaft can rotate freely, the outer wall of the middle section of the positioning shaft is provided with an annular groove and a retaining ring is installed in the annular groove. The two bearings are located between the lower part of the rotating shaft positioning part and the upper part of the retaining ring. The central through hole of the positioning plate is provided with a raised annular ring located between the two bearings.

[0011] Preferably, in order to reduce the area of ​​the upper end face of the rotating shaft positioning part and further improve the installation accuracy of the rotating shaft for mounting the shaft-separated non-contact angular displacement sensor, the upper end face of the rotating shaft positioning part is provided with a transversely penetrating groove, and the two side walls of the groove are flush with the opposite side walls of the positioning blind hole.

[0012] Preferably, in order to prevent the pressure block from moving upward during vibration testing, a transverse locking screw hole is provided on one side wall of the central through hole of the pressure plate.

[0013] Preferably, in order to facilitate the connection between the positioning plate and the base, both the positioning plate and the base are rectangular. The positioning plate has vertically penetrating positioning plate connection holes near both ends, and the base has base connection holes at positions corresponding to the two positioning plate connection holes. The second connecting screw passes through the positioning plate connection holes and the base connection holes.

[0014] Preferably, in order to facilitate adjustment of the relative position between the positioning plate and the base, both the positioning plate connection hole and the base connection hole are strip-shaped holes and their length direction is perpendicular to the length direction of the positioning plate.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention utilizes a design with a base, positioning plate, support column, positioning shaft, positioning pin, pressure plate, pressure block, and compression spring that work together to achieve circumferential and axial positioning of the shaft of a non-contact angular displacement sensor. The positioning protrusions at the upper ends of multiple positioning pins are placed within the mounting through holes of the sensor body to achieve circumferential positioning of the sensor body. The compression spring's elasticity presses the pressure block against the sensor body to achieve axial positioning. This design enables circumferential and axial positioning of the sensor body and shaft of the non-contact angular displacement sensor. The coaxiality and spacing accuracy between the sensor body and shaft can be controlled using existing machining precision techniques. This allows manufacturers to test and verify relevant performance parameters before product delivery, ensuring the product meets application requirements immediately upon delivery. This improves user satisfaction, enhances corporate reputation, and reduces management costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of a typical shaft-separated non-contact angular displacement sensor.

[0018] Figure 2 This is a schematic diagram of the main structure of the test positioning fixture for the shaft-separated non-contact angular displacement sensor described in this utility model;

[0019] Figure 3 yes Figure 2 A schematic diagram of the AA cross-sectional structure in the diagram;

[0020] Figure 4 This is a top view of the positioning plate of the test positioning fixture for the shaft-separated non-contact angular displacement sensor described in this utility model.

[0021] Figure 5 This is a top view of the base of the test positioning fixture for the shaft-separated non-contact angular displacement sensor described in this utility model.

[0022] Figure 6 This is a side view of the positioning shaft of the testing and positioning fixture for the shaft-separated non-contact angular displacement sensor described in this utility model. The scale of the figure is larger than [missing information]. Figure 1 ;

[0023] Figure 7 This is a top view of the positioning shaft of the testing and positioning fixture for the shaft-separated non-contact angular displacement sensor described in this utility model. The scale of the figure is larger than [missing information]. Figure 7 ;

[0024] Figure 8 This is a schematic diagram of the main structure of the test positioning fixture for the shaft-separated non-contact angular displacement sensor described in this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] like Figures 2-7As shown, the test positioning fixture for a shaft-separated non-contact angular displacement sensor of this utility model includes a base 17, a positioning plate 16, support columns 12, a positioning shaft 18, a positioning column 14, a pressure plate 9, a pressure block 11, and a compression spring 10. The base 17 has a vertical base center through hole 24, the horizontal positioning plate 16 has a vertical positioning plate center through hole 28, and the horizontal pressure plate 9 has a vertical pressure plate center through hole (not marked in the figure). The positioning plate 16 is mounted on the base 17. The lower ends of multiple (four in the figure) vertical support columns 12 are respectively connected to positions on the base 17 outside the positioning plate 16, and the upper ends of multiple support columns 12 are respectively connected to positions on the pressure plate 9 near the edge. The vertical positioning shaft 18 passes through the base center through hole 24 and the positioning plate center through hole 28 and is connected to the hole wall of the positioning plate center through hole 28 through a bearing 20. The upper outer diameter of the positioning shaft 18 is increased to form a rotating shaft positioning part 1. 5. The upper center of the rotating shaft positioning part 15 is provided with a positioning blind hole 19 with an upper opening. The hole wall of the positioning blind hole 19 is provided with a radial positioning hole 31 that is horizontally through (which can be a screw hole or a general through hole as needed). The positioning plate 16 is provided with multiple (three in the figure) vertical positioning post mounting holes 23 that are evenly distributed along the circumference outside the central through hole 28 of the positioning plate. The lower ends of the multiple (three in the figure) positioning posts 14 are respectively installed in the multiple positioning post mounting holes 23. The upper middle part of the positioning post 14 is provided with an upwardly protruding positioning protrusion 13. The upper end face of the positioning protrusion 13 is higher than the upper end face of the rotating shaft positioning part 15. The lower part of the pressure block 11 is a horizontal plane, and the upper middle part is connected to an integrally formed vertical guide post 6. The guide post 6 passes through the central through hole of the pressure plate. The vertical compression spring 10 is fitted outside the guide post 6 and is located between the pressure plate 9 and the pressure block 11. The pressure block 11 is located directly above the rotating shaft positioning part 15.

[0027] like Figures 1-7 As shown, this utility model also discloses the following more optimized specific structures:

[0028] To reliably connect the positioning post 14 and the positioning plate 16, the middle section diameter of the positioning post mounting hole 23 is smaller than the upper and lower section diameters, forming an upper annular step (not marked in the figure) and a lower annular step (not marked in the figure) respectively. The lower end of the positioning post 14 is located above the corresponding upper annular step. The lower end of the positioning post 14 is provided with a screw hole 21 with an open lower end in the middle. The stud of the first connecting screw (not shown in the figure) passes through the corresponding positioning post mounting hole 23 from bottom to top and connects with the screw hole 21 at the lower end of the corresponding positioning post 14, and the nut of the first connecting screw is blocked by the corresponding lower annular step.

[0029] To facilitate adjustment of the upper height of the positioning post 14 as needed, a washer 22 is provided between the lower end of the positioning post 14 and the upper surface of the upper annular step, and the stud of the corresponding first connecting screw passes through the central through hole of the washer 22. The thickness and number of washers 22 are determined as needed.

[0030] To facilitate reliable installation of the positioning shaft 18 and ensure that the positioning shaft 18 can rotate freely, the outer wall of the middle section of the positioning shaft 18 is provided with an annular groove 32 and a retaining ring (not marked in the figure) is installed in the annular groove 32. Two bearings 20 are located between the lower part of the rotating shaft positioning part 15 and the upper part of the retaining ring. A raised annular convex ring (not marked in the figure) is provided on the hole wall of the central through hole 28 of the positioning plate at the position between the two bearings 20.

[0031] In order to reduce the area of ​​the upper end face of the shaft positioning part 15 and further improve the installation accuracy of the shaft 3 for mounting the shaft-separated non-contact angular displacement sensor, the upper end face of the shaft positioning part 15 is provided with a transverse through groove 30, and the two side walls of the groove 30 are flush with the opposite side walls of the positioning blind hole 19.

[0032] To prevent the pressure block 11 from moving upward during vibration testing, a transversely penetrating locking screw hole 8 is provided on one side wall of the central through hole of the pressure plate. Since the side wall is relatively thick, the locking screw hole 8 is located in the side wall near the inner side. The side wall near the outer side is provided as a through hole 7. The through hole 7 is coaxial with the locking screw hole 8 and has a larger diameter.

[0033] To facilitate the connection between the positioning plate 16 and the base 17, both the positioning plate 16 and the base 17 are rectangular. The lower part of the positioning plate 16 extends outward near both ends to form a mounting part 27 with reduced thickness. The mounting part 27 is provided with a vertically penetrating positioning plate connection hole 25 (which can be a screw hole or a general through hole as needed). The base 17 is provided with base connection holes 26 (which can be screw holes or general through holes as needed) at positions corresponding to the two positioning plate connection holes 25. The second connecting screw (not shown in the figure) passes through the positioning plate connection hole 25 and the base connection hole 26.

[0034] To facilitate adjustment of the relative position between the positioning plate 16 and the base 17, both the positioning plate connecting hole 25 and the base connecting hole 26 are strip-shaped holes with their length direction perpendicular to the length direction of the positioning plate 16.

[0035] Figure 5 The diagram also shows a connection hole 29 on the base 17 for connection with the support column 12, which is a conventional adaptive structure.

[0036] like Figures 1-8As shown, in application, first lift the pressure block 11 upwards; install the rotating shaft 3 of the shaft-separated non-contact angular displacement sensor in the positioning blind hole 19 of the rotating shaft positioning part 15 and connect it to the rotating shaft screw hole 4 through the radial positioning hole 31 with the locking screw (not shown in the figure) to achieve circumferential and axial positioning and locking installation of the rotating shaft 3. Place the positioning protrusions 13 at the upper ends of the multiple positioning posts 14 into the multiple mounting through holes 5 of the sensor body 1 of the shaft-separated non-contact angular displacement sensor to achieve circumferential positioning of the sensor body 1. Then loosen the pressure block 11 and use the elastic force of the compression spring 10 to press the pressure block 11 against the sensor body 1 to achieve axial positioning of the sensor body 1. In this way, the circumferential and axial positioning installation functions of the sensor body 1 and the rotating shaft 3 of the shaft-separated non-contact angular displacement sensor are achieved. Then, install the base 17 on the relevant testing equipment (not shown in the figure), connect the lower end of the positioning shaft 18 to the relevant rotating parts, and connect the lead wire on the sensor body 1 to the relevant electrical components. Then, the relevant performance parameters of the sensor can be tested and verified.

[0037] If vibration testing is required, after completing the above installation, install the locking screw (not shown in the figure) in the locking screw hole 8 and press it against the guide post 6 to achieve axial locking of the sensor body 1, and then the vibration test can be carried out.

[0038] Note: Since this fixture is generally installed on testing equipment and not placed directly on the table, the lower end of the positioning shaft 18 extends below the base 17, which does not affect the normal use of this fixture.

[0039] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A testing and positioning fixture for a shaft-separated non-contact angular displacement sensor, comprising a base, characterized in that: It also includes a positioning plate, support columns, a positioning shaft, a pressure plate, a pressure block, and a compression spring. The base has a vertical central through hole, the horizontal positioning plate has a vertical central through hole, and the horizontal pressure plate has a vertical central through hole. The positioning plate is mounted on the base. The lower ends of multiple vertical support columns are connected to positions on the base outside the positioning plate, and the upper ends of multiple support columns are connected to positions on the pressure plate near the edge. The vertical positioning shaft passes through the central through hole of the base and the central through hole of the positioning plate and is connected to the wall of the central through hole of the positioning plate through a bearing. The upper outer diameter of the positioning shaft is increased to form a rotating shaft positioning part. The upper center position of the rotating shaft positioning part is set with... The positioning blind hole has an opening at the top. The wall of the positioning blind hole has a radially through-hole. The positioning plate has multiple vertically oriented positioning post mounting holes evenly distributed along the circumference at a position outside the central through-hole of the positioning plate. The lower ends of the multiple positioning posts are respectively installed in the multiple positioning post mounting holes. The upper end of the positioning post has an upwardly protruding positioning protrusion at the middle. The upper end face of the positioning protrusion is higher than the upper end face of the rotating shaft positioning part. The bottom of the pressure block is a horizontal plane, and the middle of the top is connected to an integrally formed vertical guide post. The guide post passes through the central through-hole of the pressure plate. The vertical compression spring is fitted outside the guide post and is located between the pressure plate and the pressure block. The pressure block is located directly above the rotating shaft positioning part.

2. The testing and positioning fixture for a shaft-separated non-contact angular displacement sensor according to claim 1, characterized in that: The middle section of the positioning post mounting hole has a diameter smaller than the upper and lower sections, forming an upper annular step and a lower annular step, respectively. The lower end of the positioning post is located above the corresponding upper annular step. The middle part of the lower end of the positioning post has a screw hole with an opening at the lower end. The stud of the first connecting screw passes through the corresponding positioning post mounting hole from bottom to top and connects with the screw hole at the lower end of the corresponding positioning post. The nut of the first connecting screw is blocked by the corresponding lower annular step.

3. The testing and positioning fixture for a shaft-separated non-contact angular displacement sensor according to claim 2, characterized in that: A washer is provided between the lower end of the positioning post and the upper surface of the upper annular step, and the stud of the corresponding first connecting screw passes through the central through hole of the washer.

4. The testing and positioning fixture for a shaft-separated non-contact angular displacement sensor according to any one of claims 1-3, characterized in that: The outer wall of the middle section of the positioning shaft is provided with an annular groove and a retaining ring is installed in the annular groove. The two bearings are located between the lower part of the rotating shaft positioning part and the upper part of the retaining ring. The central through hole of the positioning plate is provided with a raised annular ring between the two bearings.

5. The test positioning fixture for a shaft-separated non-contact angular displacement sensor according to any one of claims 1-3, characterized in that: The upper end face of the rotating shaft positioning part is provided with a transverse through groove, and the two side walls of the groove are flush with the opposite side walls of the positioning blind hole.

6. The testing and positioning fixture for a shaft-separated non-contact angular displacement sensor according to any one of claims 1-3, characterized in that: A horizontally penetrating locking screw hole is provided on one side wall of the central through hole of the pressure plate.

7. The testing and positioning fixture for a shaft-separated non-contact angular displacement sensor according to any one of claims 1-3, characterized in that: Both the positioning plate and the base are rectangular. The positioning plate has vertically penetrating positioning plate connection holes near both ends. The base has base connection holes at positions corresponding to the two positioning plate connection holes. The second connecting screw passes through the positioning plate connection holes and the base connection holes.

8. The testing and positioning fixture for a shaft-separated non-contact angular displacement sensor according to claim 7, characterized in that: Both the positioning plate connection hole and the base connection hole are strip-shaped holes, and their length direction is perpendicular to the length direction of the positioning plate.

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