A high-precision rotary positioning device and a rotary positioning method

Abstract

The application discloses a high-precision rotary positioning device and a rotary positioning method. The center positioning edge rotating mode is adopted, so that the positioning of a workpiece to be measured is more convenient and has higher positioning precision, and the rotation of the rotary positioning device is more stable, thereby effectively controlling the jumping and deflection errors of the workpiece to be measured in the rotation process, and greatly improving the positioning and rotation test precision of the workpiece to be measured.

Description

Technical Field

[0001] This invention belongs to the technical field of workpiece rotation positioning, and relates to a high-precision rotation positioning device and rotation positioning method. Background Technology

[0002] In recent years, with the increasing demand for electromagnetic compatibility and RCS testing of aerospace components, products, and materials, higher requirements have been placed on the accuracy and precision of the test results. Currently, the testing method for large-size targets is the cylindrical field measurement method, in which the target under test is mounted on a rotary positioning device, and the high-precision positioning system of the rotary positioning device provides a precise pulse signal to the testing system, thereby triggering the microwave feed center to emit electromagnetic wave pulses for testing.

[0003] Traditional rotary support devices in microwave anechoic chambers include rotary positioning devices, drive devices, support devices, and related control, signal, protection, and adjustment equipment. A key characteristic is that the drive motor is installed at the center of the rotary support device, resulting in poor operational stability. In particular, the uncontrollable runout of the table end face of the rotary support device leads to inaccurate test results. Furthermore, drive motor failure during testing renders the rotary support device unusable, severely impacting testing efficiency. Simultaneously, the relatively small size of the rotary support device results in limited load capacity, suitable only for testing small components and low-load products, and unsuitable for high-precision testing of large, heavy-load targets. Moreover, the test object is not sufficiently stable when mounted on the rotary positioning device, making it prone to wobbling during rotation.

[0004] Therefore, in view of the shortcomings of existing rotary support devices, such as uncontrollable runout and inability to meet the high-precision positioning and rotation test requirements of large-sized heavy-load targets, this invention discloses a high-precision rotary positioning device and rotary positioning method. Summary of the Invention

[0005] The purpose of this invention is to provide a high-precision rotary positioning device and rotary positioning method. By adopting a center positioning and edge rotation method, the positioning of the workpiece under test is more convenient and the positioning accuracy is higher. At the same time, the rotation of the rotary positioning device is more stable, thereby effectively controlling the runout and wobble error of the workpiece under test during the rotation process, and greatly improving the positioning and rotation testing accuracy of the workpiece under test.

[0006] This invention is achieved through the following technical solution:

[0007] A high-precision rotary positioning device includes a support tower and a central positioning shaft rotatably disposed at the center of the support tower. A vibration damping platform is disposed at the top of the central positioning shaft, and a rotation angle detection device is disposed at the bottom of the central positioning shaft. A central positioning device is coaxially disposed at the top of the vibration damping platform. The central positioning device includes clamping devices symmetrically disposed around the center point of the vibration damping platform. A plurality of clamping and limiting devices are uniformly disposed around the clamping devices in the circumferential direction. An edge rotation drive device is disposed circumferentially at the bottom edge of the vibration damping platform. The edge rotation drive device is used to drive the vibration damping platform to rotate about the axis of the central positioning shaft.

[0008] To better realize the present invention, the clamping device further includes a clamping table, the bottom of the clamping table is connected to a damping table, clamping members are symmetrically slidably arranged on both sides of the top of the clamping table, and a clamping drive device is provided at the bottom of the clamping table to drive the clamping members on both sides to move synchronously towards each other or synchronously towards each other.

[0009] To better realize the present invention, the clamping and limiting device further includes a swing device and a clamping and limiting rod. The swing device is arranged circumferentially at the edge of the clamping table. The clamping and limiting rod is provided on the swing end of the swing device. The swing device drives the clamping and limiting rod to rotate toward the center of the clamping table.

[0010] To better realize the present invention, the vibration damping platform further includes a support platform body, and a vibration damping sleeve is provided at the center of the support platform body. The bottom of the vibration damping sleeve is connected to the top of the central positioning shaft through at least one layer of vibration damping unit. The vibration damping unit includes at least two overlapping vibration damping steel plates and vibration damping spring sheets.

[0011] To better realize the present invention, a vibration damping bearing is further provided between the central positioning shaft and the support tower.

[0012] To better realize the present invention, the edge rotation drive device further includes an annular guide rail, a drive wheel set, and a driven wheel set. The annular guide rail is coaxially disposed below the damping platform. A plurality of drive wheel sets are uniformly arranged circumferentially between the bottom edge of the damping platform and the top of the annular guide rail. The drive wheel sets are in contact with the top of the annular guide rail. Each drive wheel set includes at least two drive mechanisms. A driven wheel set is disposed between adjacent drive wheel sets, and the driven wheel set is in contact with the top of the annular guide rail.

[0013] To better realize the present invention, it further includes a controller connected to the edge rotation drive device, the controller being used to set the rotation angle and speed of the edge rotation drive device.

[0014] To better realize the present invention, the corner detection device further includes a grating fixing base, an annular grating, and a grating reading probe. The grating fixing base is coaxially disposed at the bottom of the central positioning shaft, and an annular grating is coaxially mounted on the grating fixing base. A grating reading probe is correspondingly disposed at the edge of the annular grating.

[0015] A high-precision rotational positioning method, based on the aforementioned high-precision rotational positioning device, includes the following steps:

[0016] Step 1: Place the workpiece to be tested on top of the center positioning device, and use the clamping device to center and clamp the workpiece so that the calibration point on the workpiece coincides with the axis of the center positioning shaft.

[0017] Step 2: Rotate the clamping and limiting device toward the workpiece to be tested, and clamp and fix the side of the workpiece to be tested by the clamping and limiting device to achieve the fixation of the workpiece to be tested.

[0018] Step 3: Set the rotation angle and speed of the edge rotation drive device through the controller. The edge rotation drive device drives the damping table to rotate at the set rotation angle and speed, thereby adjusting the posture of the workpiece to be tested.

[0019] To better realize the present invention, further, during the rotation of the vibration damping table, the actual rotation angle and actual speed of the center positioning shaft and the vibration damping table are detected in real time by the rotation angle detection device, and the actual rotation angle and actual speed are compared with the rotation angle and speed set in the controller.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] (1) The present invention sets the center positioning device at the top center of the damping table. The damping table itself has a buffer and vibration reduction structure to effectively reduce the rotation of the workpiece under test, effectively solving the problem of the workpiece under test jumping and swaying. At the same time, a high-precision rotation angle detection device is set at the bottom of the center positioning shaft to detect the rotation angle and rotation speed of the workpiece in real time, thereby ensuring the accuracy of the positioning rotation test of the workpiece under test.

[0022] (2) The present invention provides several edge rotation drive devices circumferentially arranged at the bottom edge of the vibration damping table. The edge of the vibration damping table is directly driven to rotate by the edge rotation drive devices. At the same time, the vibration damping table is supported by the edge rotation drive devices, which ensures the smooth rotation of the vibration damping table and reduces the jumping and swaying errors of the workpiece under test during the rotation process.

[0023] (3) The present invention adopts an edge drive structure with several edge rotation drive devices circumferentially set at the bottom edge of the vibration damping table to replace the rotation structure of the central rotating shaft, thereby enabling the size of the vibration damping table to be set larger, thus meeting the high-precision positioning and rotation test of large-size heavy-duty workpieces.

[0024] (4) The present invention uses the clamping device in the center positioning device to center and clamp the workpiece to be tested, and uses the top-tightening and limiting device in the center positioning device to tighten and fix the side of the workpiece to be tested, thereby effectively avoiding the problem of the workpiece to be tested moving during rotation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a high-precision rotary positioning device.

[0026] Figure 2 A schematic diagram of the connection structure with the central positioning axis;

[0027] Figure 3 This is a schematic diagram of the installation of the circular guide rail;

[0028] Figure 4 This is a schematic diagram of the corner detection device;

[0029] Figure 5 This is a schematic diagram of the drive wheel assembly.

[0030] Figure 6 This is a schematic diagram of the driven wheel assembly.

[0031] Figure 7 A schematic diagram of the center positioning device;

[0032] Figure 8 This is a schematic diagram of the installation of the center positioning device.

[0033] Wherein: 1-Center positioning device; 101-Clamping platform; 102-First servo motor; 103-Lead screw; 104-Limiting guide rod; 105-Slide table; 106-Tightening limiting rod; 107-Clamping component; 108-Protective plate; 109-Sway device; 2-Supporting platform; 3-Upper damping spring plate; 4-Damping steel plate; 5-Lower damping spring plate; 6-Center positioning shaft; 7-First bearing; 8-Second bearing; 9-Drive servo motor; 10-Reducer; 11-Transmission wheel; 12-Annular guide rail; 13-Grate fixing seat; 14-Annular grating; 15-Grate reading probe; 16-Supporting tower; 17-Foundation; 18-Drive wheel seat; 19-Driven wheel seat. Detailed Implementation

[0034] Example 1:

[0035] This embodiment provides a high-precision rotary positioning device, such as... Figure 1 As shown, the device includes a support tower 16 and a central positioning shaft 6 rotatably disposed at the center of the support tower 16. A vibration damping platform is disposed at the top of the central positioning shaft 6, and a rotation angle detection device is disposed at the bottom of the central positioning shaft 6. A central positioning device 1 is coaxially disposed at the top of the vibration damping platform. The central positioning device 1 includes clamping devices symmetrically disposed around the center point of the vibration damping platform. Several clamping and limiting devices are uniformly disposed around the clamping devices in the circumferential direction. An edge rotation drive device is disposed circumferentially at the bottom edge of the vibration damping platform. The edge rotation drive device is used to drive the vibration damping platform to rotate about the axis of the central positioning shaft 6.

[0036] A support tower 16 is mounted on a foundation 17. A mounting hole is located at the center of the support tower 16, and a central positioning shaft 6 is coaxially mounted in the mounting hole. A vibration damping platform is mounted on the top of the central positioning shaft 6 via connecting bolts. A central positioning device 1 is coaxially mounted on the top of the vibration damping platform, along with the central positioning shaft 6. The workpiece to be tested is clamped and mounted on the top of the vibration damping platform using a clamping device in the central positioning device 1. The side of the workpiece to be tested is clamped and fixed using a tightening and limiting device in the central positioning device 1, thereby achieving the positioning and fixation of the workpiece on the top of the vibration damping platform. A rotation angle detection device is located at the bottom of the central positioning shaft 6. This device can detect the rotation angle of the central positioning shaft 6 in real time, which is the rotation angle of the workpiece to be tested.

[0037] The clamping device is used to clamp and position the workpiece to be tested. The clamping and limiting device rotates towards the workpiece to clamp its side, thus fixing the workpiece and preventing it from moving during subsequent rotation. An edge rotation drive device, circumferentially located at the bottom edge of the vibration damping platform, drives the platform to rotate circumferentially around the axis of the central positioning shaft 6, thereby causing the workpiece fixed at its top to rotate circumferentially. While driving the vibration damping platform circumferentially, the edge rotation drive device also provides multi-point circumferential support, ensuring stability during rotation. Combined with the platform's own buffering and vibration reduction capabilities, this significantly improves the stability of the workpiece.

[0038] Example 2:

[0039] This embodiment provides a high-precision rotary positioning device, such as... Figure 7 and Figure 8 As shown, an improvement is made based on the above embodiment 1. The clamping device includes a clamping table 101. The bottom of the clamping table 101 is connected to the damping table. Clamping members 107 are symmetrically slidably arranged on both sides of the top of the clamping table 101. A clamping drive device is provided at the bottom of the clamping table 101 to drive the clamping members 107 on both sides to move synchronously towards each other or synchronously towards each other.

[0040] The clamping platform 101 has symmetrically arranged sliding grooves on both sides of its top. A slide table 105 is slidably mounted in each groove, with its top extending upwards through the groove and connecting to the clamping member 107. This allows the clamping members 107 on both sides to slide closer to or further away from each other along the grooves with the slide table 105. The clamping drive device includes a first servo motor 102, a lead screw 103, and a limiting guide rod 104. The lead screw 103 is rotatably mounted on the bottom of the clamping platform 101 via a bearing seat and is parallel to the sliding groove. One end of the lead screw 103 is connected to the output end of the first servo motor 102, and the limiting guide rod 104 is arranged parallel to one or both sides of the lead screw 103. The middle of the slide table 105 has a threaded hole that engages with the lead screw 103, and the sides of the slide table 105 have guide holes that slidably engage with the limiting guide rod 104.

[0041] Furthermore, protective plates 108 are provided at both ends of the clamping member 107 to effectively protect the workpiece to be tested.

[0042] The clamping and limiting device includes a swing device 109 and a clamping and limiting rod 106. The swing device 109 is arranged circumferentially at the edge of the clamping table 101. The clamping and limiting rod 106 is provided on the swing end of the swing device 109. The swing device 109 drives the clamping and limiting rod 106 to rotate toward or away from the center of the clamping table 101.

[0043] Furthermore, the yaw device 109 is a yaw cylinder, and the end of the yaw rod of the yaw cylinder is provided with a clamping limit rod 106.

[0044] Furthermore, at least three sets of deflection devices 109 are evenly spaced along the circumferential direction at the edge of the clamping platform 101.

[0045] The other parts of this embodiment are the same as those in Embodiment 1, so they will not be described again.

[0046] Example 3:

[0047] This embodiment provides a high-precision rotary positioning device, which is an improvement on the above-described embodiment 1 or 2, such as... Figure 3 As shown, the vibration damping platform includes a support platform 2, and a vibration damping sleeve is provided at the center of the support platform 2. The bottom of the vibration damping sleeve is connected to the top of the central positioning shaft 6 through at least one layer of vibration damping unit. The vibration damping unit includes at least two overlapping vibration damping steel plates 4 and vibration damping spring sheets.

[0048] like Figure 2As shown, the bottom of the damping sleeve is connected to an upper damping spring plate 3 via a support connecting bolt. A damping steel plate 4 is connected to the bottom of the upper damping spring plate 3, and a lower damping spring plate 5 is connected to the bottom of the damping steel plate 4 via a connecting bolt. The elastic damping structure formed by the superposition of the upper damping spring plate 3, the damping steel plate 4, and the lower damping spring plate 5 can effectively limit the runout and sway of the external bearing of the central positioning shaft 6.

[0049] Furthermore, the material of the damping steel plate 4 is 65Mn, and the thickness of the damping steel plate 4 is greater than or equal to 3mm. The thickness of the upper damping spring plate 3 and the lower damping spring plate 5 is greater than or equal to 1.5mm, and the diameter of the damping steel plate 4 is greater than or equal to 220mm.

[0050] Furthermore, a vibration damping bearing is provided between the central positioning shaft 6 and the support tower 16.

[0051] Furthermore, the vibration damping bearing includes a first bearing 7 and a second bearing 8, which are sequentially mounted on the outside of the central positioning shaft 6 from top to bottom.

[0052] The other parts of this embodiment are the same as those in Embodiment 1 or 2, so they will not be described again.

[0053] Example 4:

[0054] This embodiment of a high-precision rotary positioning device is an improvement upon any one of embodiments 1-3 described above, such as... Figure 3 As shown, the edge rotation drive device includes an annular guide rail 12, a drive wheel set, and a driven wheel set. The annular guide rail 12 is coaxially arranged below the damping platform. A plurality of drive wheel sets are evenly arranged circumferentially between the bottom edge of the damping platform and the top of the annular guide rail 12. The drive wheel sets are in contact with the top of the annular guide rail 12. Each drive wheel set includes at least two drive mechanisms. A driven wheel set is arranged between adjacent drive wheel sets, and the driven wheel set is in contact with the top of the annular guide rail 12.

[0055] like Figure 5 As shown, the drive wheel assembly includes a drive servo motor 9, a reducer 10, transmission wheels 11, and a drive wheel seat 18. The drive wheel seat 18 is connected to the bottom edge of the vibration damping platform via connecting bolts. Two sets of transmission wheels 11 are rotatably mounted on the drive wheel seat 18. The axles of the transmission wheels 11 are connected to the reducer 10, and the reducer 10 is connected to the drive servo motor 9. This dual-backup drive structure ensures that even if one drive servo motor 9 fails, the transmission wheels 11 can still be driven to rotate along the annular guide rail 12 when the other drive servo motor 9 is functioning normally.

[0056] like Figure 6As shown, the driven wheel assembly includes a driven wheel seat 19 and a transmission wheel 11. The driven wheel seat 19 is connected to the bottom edge of the vibration damping platform by connecting bolts, and at least one set of transmission wheels 11 is rotatably arranged on the driven wheel seat 19.

[0057] Furthermore, it also includes a controller connected to the edge rotation drive device, the controller being used to set the rotation angle and speed of the edge rotation drive device. The controller is connected to the drive servo motor 9 and is used to control the speed and rotation direction of the drive servo motor 9.

[0058] The other parts of this embodiment are the same as any one of embodiments 1-3, so they will not be described again.

[0059] Example 5:

[0060] This embodiment of a high-precision rotary positioning device is an improvement upon any one of embodiments 1-4 described above, such as... Figure 4 As shown, the corner detection device includes a grating fixing base 13, an annular grating 14, and a grating reading probe 15. The grating fixing base 13 is coaxially disposed at the bottom of the central positioning shaft 6. The annular grating 14 is coaxially mounted on the grating fixing base 13, and the grating reading probe 15 is correspondingly disposed at the edge of the annular grating 14.

[0061] The annular grating 14 is ring-shaped, and a grating fixing seat 13 is provided at the bottom of the annular grating 14. The grating fixing seat 13 is connected to the bottom of the central positioning shaft 6. Grating reading probes 15 are symmetrically arranged on both sides of the annular grating 14.

[0062] The other parts of this embodiment are the same as any one of embodiments 1-4, so they will not be described again.

[0063] Example 6:

[0064] This embodiment of a high-precision rotational positioning method is implemented based on the high-precision rotational positioning device described in any one of embodiments 1-5.

[0065] Includes the following steps:

[0066] Step 1: Place the workpiece to be tested on top of the center positioning device 1, and use the clamping device to center and clamp the workpiece so that the calibration point on the workpiece coincides with the axis of the center positioning shaft 6.

[0067] Step 2: Rotate the clamping and limiting device toward the workpiece to be tested, and clamp and fix the side of the workpiece to be tested by the clamping and limiting device to achieve the fixation of the workpiece to be tested.

[0068] Step 3: Set the rotation angle and speed of the edge rotation drive device through the controller. The edge rotation drive device drives the damping table to rotate at the set rotation angle and speed, thereby adjusting the posture of the workpiece to be tested.

[0069] Furthermore, the actual rotation angle and actual speed of the center positioning shaft 6 and the damping table are detected in real time by the rotation angle detection device, and the actual rotation angle and actual speed are compared with the rotation angle and speed set in the controller.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A high-precision rotary positioning device comprising a support tower (16) and a central positioning shaft (6) arranged to rotate in the center of the support tower (16), characterized in that, A damping platform is provided at the top of the central positioning shaft (6), and a corner detection device is provided at the bottom of the central positioning shaft (6); a central positioning device (1) is coaxially provided at the top of the damping platform, and the central positioning device (1) includes a clamping device symmetrically arranged around the center point of the damping platform, and a plurality of clamping and limiting devices are uniformly arranged around the clamping device in the circumferential direction; an edge rotation drive device is provided at the bottom edge of the damping platform in the circumferential direction, and the edge rotation drive device is used to drive the damping platform to rotate around the axis of the central positioning shaft (6). The clamping and limiting device includes a swing device (109) and a clamping and limiting rod (106). The swing device (109) is arranged circumferentially at the edge of the clamping table (101). The swing end of the swing device (109) is provided with a clamping and limiting rod (106). The swing device (109) drives the clamping and limiting rod (106) to rotate toward the center of the clamping table (101). The edge rotation drive device includes an annular guide rail (12), a drive wheel set, and a driven wheel set. The annular guide rail (12) is coaxially arranged below the damping platform. Several drive wheel sets are evenly arranged circumferentially between the bottom edge of the damping platform and the top of the annular guide rail (12). The drive wheel sets are in contact with the top of the annular guide rail (12). Each drive wheel set includes at least two drive mechanisms. A driven wheel set is arranged between adjacent drive wheel sets. The driven wheel set is in contact with the top of the annular guide rail (12).

2. A high precision rotary positioning device according to claim 1, characterized in that The clamping device includes a clamping table (101), the bottom of which is connected to a damping table. Clamping members (107) are symmetrically slidably arranged on both sides of the top of the clamping table (101). A clamping drive device is provided at the bottom of the clamping table (101) to drive the clamping members (107) on both sides to move synchronously towards each other or synchronously towards each other.

3. A high precision rotary positioning device according to any one of claims 1-2, characterized in that, The vibration damping platform includes a support platform (2), and a vibration damping sleeve is provided at the center of the support platform (2). The bottom of the vibration damping sleeve is connected to the top of the central positioning shaft (6) through at least one layer of vibration damping unit. The vibration damping unit includes at least two overlapping vibration damping steel plates (4) and vibration damping spring sheets.

4. A high precision rotary positioning device according to claim 3, wherein A vibration damping bearing is provided between the central positioning shaft (6) and the support tower (16).

5. A high precision rotary positioning device according to any one of claims 1-2, characterized in that, It also includes a controller connected to the edge rotation drive, the controller being used to set the rotation angle and speed of the edge rotation drive.

6. A high precision rotary positioning device according to any one of claims 1-2, characterized in that, The corner detection device includes a grating mounting base (13), an annular grating (14), and a grating reading probe (15). The grating mounting base (13) is coaxially mounted at the bottom of the central positioning shaft (6). An annular grating (14) is coaxially mounted on the grating mounting base (13), and a grating reading probe (15) is correspondingly arranged at the edge of the annular grating (14).

7. A high-precision rotary positioning method, implemented based on the high-precision rotary positioning device according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Place the workpiece to be tested on top of the center positioning device (1) and center and clamp the workpiece to be tested through the clamping device so that the calibration point on the workpiece to be tested coincides with the axis of the center positioning shaft (6). Step 2: Rotate the clamping and limiting device toward the workpiece to be tested, and clamp and fix the side of the workpiece to be tested by the clamping and limiting device to achieve the fixation of the workpiece to be tested. Step 3: Set the rotation angle and speed of the edge rotation drive device through the controller. The edge rotation drive device drives the damping table to rotate at the set rotation angle and speed, thereby adjusting the posture of the workpiece to be tested.

8. The high-precision rotary positioning method according to claim 7, characterized in that, During the rotation of the vibration damping platform, the actual rotation angle and actual speed of the center positioning shaft (6) and the vibration damping platform are detected in real time by the rotation angle detection device, and the actual rotation angle and actual speed are compared with the rotation angle and speed set in the controller.

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