A transmission backlash accuracy test system for lunar soil and water ice detection drive mechanisms

Abstract

The present invention discloses a system for testing the transmission return accuracy of a drive mechanism for lunar soil and water ice detection, comprising a turntable, a fixing frame, a support seat, a reflector assembly, an autocollimator, a multi-dimensional adjustment table, a base plate, and a drive mechanism. The drive mechanism is mounted on the turntable via the support seat and the fixing frame, and the relative positions of the autocollimator and the reflector assembly are adjusted so that the optical axis of the autocollimator is perpendicular to the reflector. During testing, the turntable is rotated in the reverse direction to compensate for the angle of rotation of the drive mechanism in the forward direction, so that the reflected image of the autocollimator is always within the test field of view, thereby achieving the transmission return accuracy test of the drive mechanism. The system has a simple structure and convenient and effective testing, and can be used for the transmission return accuracy test of the drive mechanism for water ice detection in lunar soil water molecule analyzers.

Description

Technical Field

[0001] The present invention relates to the field of lunar soil water molecule and water ice detection, and in particular to a transmission backlash accuracy testing system for a lunar soil and water ice detection drive mechanism. Background Art

[0002] Chang'e-7 aims to conduct in-situ detection of lunar regolith water ice in the permanently shadowed region of the Moon's South Pole. A lunar regolith water molecule analyzer (LRWA) is aboard the spacecraft. After landing in the shadowed region, the spacecraft will begin drilling and sampling. The drill bit, through cutting and extrusion, will transfer subsurface soil to the lunar surface. A robotic arm will then grab the sample and transfer it to the LRWA for analysis. Lunar regolith water ice refers to solid water contained in the lunar soil. The unique lighting conditions and surface environment of the lunar polar regions create ideal locations for water enrichment and preservation. Detecting water ice in the lunar regolith and its hydrogen and oxygen isotopes is of great significance to scientific research and the development and utilization of lunar resources.

[0003] In order to deliver the acquired water ice samples to the heating furnace for analysis, a sealing drive mechanism and a station conversion drive mechanism are designed in the lunar soil water molecule analyzer to provide power output for the reception, delivery, sealing and disposal of lunar soil water ice samples. Due to its compact structure, wide operating temperature range and large load resistance torque, the designed drive mechanisms all adopt worm gear transmission technology to meet the task requirements of the drive mechanism. The backlash characteristics of the worm gear transmission can ensure good transmission of the mechanism under a wide temperature range. However, if the transmission backlash accuracy exceeds the transmission fault tolerance range of the mechanism design, it will reduce the reliability of the multi-station collaborative work and leave safety hazards. For this reason, it is necessary to test the transmission backlash accuracy of the drive mechanism. In addition, the existing transmission backlash test system cannot realize the transmission backlash accuracy test at any position within a 360-degree range and is not suitable for the existing drive mechanism. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a lunar soil and water ice detection drive mechanism transmission return accuracy test system, which has a simple structure and convenient and effective testing.

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] A lunar soil and water ice detection drive mechanism transmission return accuracy test system, including a turntable, a fixing frame, a support seat, a reflector assembly, an autocollimator, a multi-dimensional adjustment table, a base plate and a drive mechanism;

[0007] One end of the turntable is statically connected to the base plate, and the other end is dynamically connected to the fixed frame;

[0008] The bottom surface of the support seat is statically connected to the fixing frame, and the side surface thereof is statically connected to the driving mechanism on which the reflector group is installed;

[0009] The autocollimator is connected to the base plate via a multi-dimensional adjustment table;

[0010] The reflector assembly includes a reflector seat, a first reflector pressure ring, a reflector, a second reflector pressure ring and a screw. The reflector seat is statically connected to the small clearance hole of the output shaft of the driving mechanism and is locked by the screw. One end of the reflector is limited by the first reflector pressure ring, and the other end is statically fitted on the reflector seat by the second reflector pressure ring. The screw is made of polytetrafluoroethylene.

[0011] Preferably, the turntable can rotate continuously 360° around the Z axis with an angle accuracy better than 30″;

[0012] Preferably, the side of the support seat is processed with interfaces of various specifications to enable installation and interchange of various types of drive mechanisms;

[0013] Preferably, the autocollimator has an aperture of ≥30 mm, a test field of view of ≥2400″, and an angle measurement accuracy of ≤10″;

[0014] Preferably, the multi-dimensional adjustment stage can achieve translation along the Y axis and the Z axis and rotation around the Y axis and the Z axis.

[0015] The beneficial effects of the present invention are:

[0016] 1. By utilizing the existing mechanical installation interface of the drive mechanism and adopting a simple and reliable system, the drive mechanism transmission backlash accuracy test can be realized, providing supporting data for the drive mechanism reliability transmission evaluation.

[0017] 2. Utilizing the principle of autocollimation, combined with the collaborative testing method of a turntable and a multi-dimensional adjustment table, 360-degree measurement of the drive mechanism can be achieved by simply adjusting the relative position of the reflector and the autocollimator once, making testing convenient.

[0018] 3. The multi-interface design and special locking screws on the support seat can quickly realize the clamping and interchange of different drive mechanisms without damaging the output shaft of the switching mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the drive mechanism transmission backlash accuracy test system of the present invention;

[0020] Figure 2 is a schematic cross-sectional view of a reflector assembly of the present invention;

[0021] Figure 3 It is a schematic diagram of the support base structure of the present invention.

[0022] Among them: 1 is a turntable, 2 is a fixing frame, 3 is a support seat, 4 is a reflector group, 5 is an autocollimator, 6 is a multi-dimensional adjustment table, 7 is a base plate, 8 is a driving mechanism, 101 is a reflector seat, 102 is a first reflector pressure ring, 103 is a reflector, 104 is a second reflector pressure ring, and 105 is a screw. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. However, the following embodiments are intended only to explain the present invention, and the scope of protection of the present invention should include the entire contents of the claims. Moreover, through the description of the following embodiments, those skilled in the art can fully implement the entire contents of the claims of the present invention.

[0024] Example

[0025] See also Figure 1-3 The present invention provides a transmission backlash accuracy testing system for a lunar soil and water ice detection drive mechanism, comprising a turntable 1, a fixed frame 2, a support seat 3, a reflector group 4, an autocollimator 5, a multi-dimensional adjustment platform 6, a base plate 7 and a drive mechanism 8; one end of the turntable 1 is statically connected to the base plate 7, and the other end is dynamically connected to the fixed frame 2; the bottom surface of the support seat 3 is statically connected to the fixed frame 2, and its side surface is statically connected to the drive mechanism 8 on which the reflector group 4 is installed; the autocollimator 5 is dynamically connected to the base plate 7 via the multi-dimensional adjustment platform 6; preferably, the turntable 1 can rotate continuously 360° around the Z axis, and the rotation angle accuracy is better than 30″; preferably, the side surface of the support seat 3 is processed with multiple specifications of interfaces, so that multiple types of drive mechanisms can be installed and interchanged; preferably, the autocollimator aperture is ≥30mm, the test field of view range is ≥2400″, and the angular measurement accuracy is ≤10″; preferably, the multi-dimensional adjustment platform can realize translation along the Y axis and Z axis and rotation around the Y axis and Z axis.

[0026] The reflector group includes a reflector seat 101, a first reflector pressure ring 102, a reflector 103, a second reflector pressure ring 104 and a screw 105. The reflector seat 101 is statically connected to the small clearance hole shaft of the output shaft of the driving mechanism 8 and is locked by the screw 105; one end of the reflector 103 is limited by the first reflector pressure ring 102, and the other end is statically fitted on the reflector seat 101 by the second reflector pressure ring 104; preferably, the screw 105 is made of polytetrafluoroethylene material.

[0027] See also Figure 1 Before testing, the reflector is automatically aligned with the autocollimator optical axis by rotating the turntable 1 and adjusting the position of the multi-dimensional adjustment stage 6. After the optical path is aligned, the multi-dimensional adjustment stage 6 is locked and the test reference optical path is determined, which serves as the first position test point of the drive mechanism 8. During the test, the reflector angle θ1 is first recorded, and then a command is sent to the drive mechanism to rotate one circle in both the forward and reverse directions. The reflector angle θ2 is then recorded again. Due to the existence of transmission backlash, there is a difference between the angles θ1 and θ2. This angle difference is the transmission backlash accuracy of the drive mechanism.

[0028] When testing the transmission backlash accuracy of the driving mechanism 8 at the second position, the driving mechanism 8 is rotated by an angle α, and the turntable 1 is rotated in the opposite direction to rotate the driving mechanism 8 back to the test field of view of the autocollimator 5. Then, a command is sent again to make the driving mechanism 8 rotate one circle in each direction, and the angle difference between the forward and reverse rotations of the driving mechanism 8 at the second position is recorded. This angle difference is the transmission backlash accuracy of the driving mechanism at the second position.

[0029] According to the above steps, the transmission backlash accuracy values ​​of other positions of the driving mechanism 8 are measured in sequence, and the transmission backlash accuracy values ​​of all positions of the driving mechanism 8 can be obtained.

[0030] See also Figure 2 、 Figure 3 The reflector group can be quickly installed with the output shafts of different drive mechanisms through screws 105; the connection with the sealing drive mechanism can be achieved through holes A1, A2, A3, and A4 on the support seat 3, and the connection with the workstation conversion drive mechanism can be achieved through holes B1, B2, B3, and B4.

[0031] The drive mechanism transmission backlash accuracy test system manufactured by the present invention tested the sealing drive mechanism transmission backlash accuracy to be better than 10', and the test station conversion drive mechanism transmission backlash accuracy to be better than 8', both meeting the index requirements and being put into use.

[0032] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A lunar soil and water ice detection drive mechanism transmission backlash accuracy test system, characterized by: It comprises a turntable (1), a fixing frame (2), a support seat (3), a reflector group (4), an autocollimator (5), a multi-dimensional adjustment table (6), a base plate (7) and a driving mechanism (8); One end of the turntable (1) is statically connected to the base plate (7), and the other end is dynamically connected to the fixed frame (2); The bottom surface of the support seat (3) is statically connected to the fixing frame (2), and the side surface thereof is statically connected to the driving mechanism (8) on which the reflector group (4) is installed; The autocollimator (5) is connected to the base plate (7) via a multi-dimensional adjustment platform (6) in a dynamic fit.

2. The lunar soil and water ice detection drive mechanism transmission backlash accuracy testing system according to claim 1, characterized in that: The reflector assembly (4) comprises a reflector seat (101), a first reflector pressing ring (102), a reflector (103), a second reflector pressing ring (104) and a screw (105); the reflector seat (101) is statically connected to the small clearance hole shaft of the output shaft of the driving mechanism (8) and is locked by the screw (105); one end of the reflector (103) is limited by the first reflector pressing ring (102), and the other end is statically fitted on the reflector seat (101) by the second reflector pressing ring (104); the screw (105) is made of polytetrafluoroethylene.

3. The lunar soil and water ice detection drive mechanism transmission backlash accuracy test system according to claim 1, characterized in that: The turntable (1) can rotate continuously 360° around the Z axis, and the rotation angle accuracy is better than 30".

4. The lunar soil and water ice detection drive mechanism transmission backlash accuracy test system according to claim 1, characterized in that: The side surface of the support seat (3) is processed with interfaces of various specifications.

5. The lunar soil and water ice detection drive mechanism transmission backlash accuracy testing system according to claim 1, characterized in that: The autocollimator (5) has an aperture of ≥30 mm, a test field of view of ≥2400″, and an angle measurement accuracy of ≤10″.

6. The lunar soil and water ice detection drive mechanism transmission backlash accuracy testing system according to claim 1, characterized in that: The multi-dimensional adjustment platform (6) can translate along the Y axis and the Z axis and rotate around the Y axis and the Z axis.

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