Transmission backlash precision test system for lunar soil water ice detection driving mechanism

Abstract

The invention discloses a transmission backlash precision testing system for a lunar soil water ice detection driving mechanism. The transmission backlash precision testing system comprises a rotary table, a fixing frame, a supporting seat, a reflecting mirror group, an autocollimator, a multi-dimensional adjusting table, a bottom plate and a driving mechanism. The driving mechanism is installed on the rotary table through the supporting base and the fixing frame, the mutual position of the autocollimator and the reflector set is adjusted, and the optical axis of the autocollimator is made to be perpendicular to the reflectors. During testing, the rotation angle of the driving mechanism in the forward direction is compensated by using the reverse rotation of the rotary table, so that the reflected image of the autocollimator is always within the range of the test field of view, and the transmission backlash precision test of the driving mechanism is realized. The system is simple in structure and convenient and effective in testing, and can be used for testing the transmission backlash precision of the water ice detection driving mechanism of the lunar soil water molecule analyzer.

Description

Technical Field

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

[0002] Chang'e-7 plans to conduct in-situ detection of lunar soil water ice in the permanent shadow area of ​​the lunar south pole. The lunar soil water molecule analyzer is carried on the spacecraft. After the spacecraft lands in the shadow area, it will start drilling and sampling. Through the cutting and squeezing of the drill bit, the soil under the lunar surface will be transferred to the lunar surface, and the sample will be grabbed by the robotic arm and sent to the lunar soil water molecule analyzer for analysis. Lunar soil water ice refers to the solid water contained in the lunar soil. The unique lighting conditions and surface environmental characteristics of the lunar polar region are ideal places for water enrichment and preservation. Detecting water ice in the lunar soil and the hydrogen and oxygen isotopes contained in the water ice are of great significance to scientific research and the development and utilization of lunar resources.

[0003] In order to send 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 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, but if the transmission backlash accuracy exceeds the transmission fault tolerance range of the mechanism design, it will reduce the reliability of 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 backlash accuracy test system, which has a simple structure and convenient and effective testing.

[0005] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] A transmission return accuracy test system for a lunar soil and water ice detection drive mechanism, comprising a turntable, a fixing frame, a support seat, a reflector group, 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 bottom 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 bottom plate via a multi-dimensional adjustment table;

[0010] The reflector assembly comprises a reflector seat, a first reflector pressing ring, a reflector, a second reflector pressing ring and a screw; the reflector seat is statically connected with the small clearance hole shaft 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 pressing ring, and the other end is statically fitted on the reflector seat by the second reflector pressing ring; the screw is made of polytetrafluoroethylene material;

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

[0012] Preferably, the side surface of the support seat is processed with interfaces of various specifications, so that installation and interchange of various types of drive mechanisms can be realized;

[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 reliability transmission evaluation of the drive mechanism.

[0017] 2. By using the principle of autocollimation and combining the method of collaborative testing of a turntable and a multi-dimensional adjustment table, the 360-degree measurement of the drive mechanism can be achieved by adjusting the relative position of the reflector and the autocollimator only once, making the test 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 It is a schematic diagram of a driving mechanism transmission backlash accuracy testing system of the present invention;

[0020] Figure 2 is a cross-sectional schematic diagram 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 supporting 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 pressing ring, 103 is a reflector, 104 is a second reflector pressing ring, and 105 is a screw. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. However, the following embodiments are limited to explaining the present invention, and the protection scope of the present invention should include the entire contents of the claims, and 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 discloses a transmission backlash accuracy testing system for a lunar soil and water ice detection driving 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 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 fixed frame 2, and its side surface is statically connected to the driving 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 be continuously rotated 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 interfaces of multiple specifications, so that multiple types of driving mechanisms can be installed and interchanged; preferably, the autocollimator has a caliber of ≥30mm, a test field of view range of ≥2400″, and an angular measurement accuracy of ≤10″; preferably, the multi-dimensional adjustment platform can realize translation along the Y axis and the Z axis and rotation around the Y axis and the Z axis.

[0026] The reflector assembly 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 the test, the reflector is self-aligned with the autocollimator optical axis by driving the turntable 1 to rotate and adjusting the position of the multi-dimensional adjustment table 6. After the optical path is aligned, the multi-dimensional adjustment table 6 is locked to determine the test reference optical path as the first position test point of the drive mechanism 8. During the test, the reflector angle θ1 is first recorded, and a command is sent to let the drive mechanism rotate one circle in the forward and reverse directions, and the reflector angle θ2 is recorded again. Due to the existence of transmission backlash, there is a difference between the angles θ1 and θ2, and the angle difference is the transmission backlash accuracy of the drive mechanism.

[0028] When testing the transmission backlash accuracy of the second position of the driving mechanism 8, 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, and a command is sent again to let the driving mechanism 8 rotate one circle in the forward and reverse directions, and the angle difference between the forward and reverse rotations of the second position of the driving mechanism 8 is recorded. The angle difference is the transmission backlash accuracy of the second position of the driving mechanism.

[0029] According to the above steps, the transmission backlash accuracy of other positions of the driving mechanism 8 is 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 station 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 is used to test the sealing drive mechanism transmission backlash accuracy to be better than 10', and the station conversion drive mechanism transmission backlash accuracy to be better than 8', both of which meet the index requirements and are put into use.

[0032] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A lunar soil and water ice detection drive mechanism transmission return accuracy test system, characterized by: It comprises a turntable (1), a fixing frame (2), a supporting 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. A lunar soil and water ice detection drive mechanism transmission backlash accuracy test system as claimed in 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 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); and the screw (105) is made of polytetrafluoroethylene.

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

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

5. The transmission backlash accuracy test system for the lunar soil and water ice detection drive mechanism 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 transmission backlash accuracy test system for the lunar soil and water ice detection drive mechanism 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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