Station conversion driving mechanism for water ice content detection of lunar soil water molecule analyzer

Abstract

The invention discloses a station conversion driving mechanism for water ice content detection of a lunar soil water molecule analyzer. The station conversion driving mechanism comprises a worm assembly, a worm gear, a worm gear case, a first flat key, a rotating shaft, a first bearing pressing ring, a first bearing, a worm gear fixing ring, a screw, a second flat key, a second bearing, an encoder, a second bearing pressing ring and an encoder seat. Worm gear and worm meshing transmission is utilized, the rotating shaft is driven to rotate by means of the supporting effect of the first bearing and the second bearing, and driving force is provided for station conversion of a sample support assembly with a hole shaft matched on the transmission shaft by means of radial limiting of the first flat key on the transmission shaft. The mechanism is compact in structure, light in weight, wide in use temperature range and large in output torque, and can be used as a driving mechanism for multi-sample support station conversion of the lunar soil water molecule analyzer.

Description

Technical Field

[0001] The present invention relates to the field of lunar soil water ice content detection, and in particular to a station conversion drive mechanism for lunar soil water molecule analyzer water ice content detection. Background Art

[0002] The lunar soil water molecule analyzer is carried on the spacecraft. After the spacecraft lands in the shadow area, it starts drilling and sampling. Through the cutting and squeezing of the drill bit, the soil under the lunar surface is transferred to the lunar surface, and the sample is 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] When the lunar soil water molecule analyzer is working in orbit, it is necessary to rotate the lunar soil water ice sample held by the sample holder from the sample receiving station to the sealing station for heating analysis through a station conversion drive mechanism. After the heating analysis, the analyzed sample is rotated from the sealing station to the sample discarding station for sample discarding. After the sample discarding is completed, it is reversed to the sample receiving station for the next process. The station conversion drive mechanism of the present invention is a satellite-borne active mechanism, and it must also take into account the high reliability requirements. Summary of the invention

[0004] In order to solve the problems of existing lunar soil water ice detection, the present invention provides a station conversion drive mechanism for water ice content detection of a lunar soil water molecule analyzer, which has a compact structure, light weight, a wide operating temperature range and a large output torque.

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

[0006] A station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer, comprising a worm assembly, a worm wheel, a worm gear box, a first flat key, a rotating shaft, a first bearing pressure ring, a first bearing, a worm wheel fixing ring, a screw, a second flat key, a second bearing, an encoder, a second bearing pressure ring and an encoder seat;

[0007] The rotating shaft is dynamically fitted with a first flat key, a first bearing, a worm gear fixing ring, a second bearing and an encoder, the first bearing is statically connected to the worm gear box, the worm gear fixing ring is connected to the rotating shaft via a second flat key, and the second bearing is statically connected to the worm gear box via an encoder seat;

[0008] One end of the worm wheel is statically connected to the worm wheel fixing ring through a screw; the other end is meshed with the vertical axis of the worm assembly;

[0009] The outer ring of the first bearing is limited by the shoulder of the worm gear box, one end of the inner ring of the first bearing is limited by the first bearing pressure ring, and one end of the inner ring of the first bearing is limited by the worm gear fixing ring;

[0010] One end of the second bearing outer ring is limited by the second bearing pressure ring, and the other end is limited by the encoder seat shoulder; one end of the second bearing inner ring is limited by the worm gear fixing ring, and the other end is limited by the rotating shaft shoulder;

[0011] One end of the encoder is statically connected to the encoder seat, and the other end is dynamically connected to the rotating shaft.

[0012] The worm assembly includes a motor, a worm, a third bearing, a fourth bearing, a third bearing pressure ring, a bearing pressure cover and a fourth bearing pressure ring. One end of the motor is dynamically fitted in the flat hole of the worm via the flat shaft of the motor rotor, and the other end is statically connected to the worm gear box; the third bearing and the fourth bearing of the motor are dynamically installed on the worm, the outer ring of the third bearing is statically fitted on the worm gear box 3 via the fourth bearing pressure ring, the outer ring of the fourth bearing is statically fitted on the worm gear box via the bearing pressure cover, and the inner ring of the fourth bearing is dynamically fitted on the worm via the third bearing pressure ring.

[0013] Preferably, the first bearing and the second bearing are 71900C solid lubrication bearings with a preload force of 50N, installed back to back, and made of 9Cr18.

[0014] Preferably, the third bearing and the fourth bearing are 61900 solid lubrication bearings, and the material is 9Cr18.

[0015] Preferably, the worm is a right-handed Archimedean spiral worm, made of 9Cr18, with the number of threads Z1=1, the module m=0.8mm, and q=15.

[0016] Preferably, the module of the worm wheel is m=0.8 mm, the number of teeth Z2=45, and the material is ZCuSn10Pb1.

[0017] Preferably, the motor is a J36BH003 solid lubrication stepper motor with a load pull-out torque of >0.15 N·m.

[0018] Preferably, the encoder 12 is a DS-40 absolute encoder with a measurement accuracy of ±0.02°.

[0019] Preferably, the material of the worm gear box, encoder seat and bearing cover is 30SiC / Al.

[0020] Preferably, the first flat key, the rotating shaft, the first bearing pressure ring, the worm gear fixing ring, the second flat key, the second bearing pressure ring, the third bearing pressure ring and the fourth bearing pressure ring are all made of 9Cr18.

[0021] The working environment temperature of the station conversion drive mechanism is -55℃~+35℃.

[0022] The repeat positioning accuracy of the station conversion drive mechanism is ≤20'.

[0023] The driving torque of the workstation conversion driving mechanism is ≥2.5N·m.

[0024] The beneficial effects of the present invention are:

[0025] 1. The simpler, more reliable and compact structure is adopted to realize the large torque, large transmission ratio and wide temperature range drive of the station conversion mechanism. The driving torque is not less than 2.5N·m, the transmission ratio is 45:1, and the operating temperature range is -55℃~+35℃.

[0026] 2. The worm gear shaft system is supported by a pair of back-to-back angular contact ball bearings. The meshing position of the worm gear and the worm can be simply and effectively adjusted by grinding the end face of the worm gear fixing ring. At the same time, the bearing preload force can meet the design requirements, reducing the difficulty of assembly. In addition, the support distance of the shaft system is increased through the back-to-back support method, which greatly improves the ability of the shaft end to withstand eccentric loads.

[0027] 3. The worm shaft system is supported by a pair of deep groove ball bearings. The inner and outer rings of the bearings at one end are fixed, while the inner ring of the bearings at the other end is free-floating, which can release the axial deformation caused by the temperature gradient and effectively reduce the risk of mechanical transmission jamming.

[0028] 4. The worm, rotating shaft, worm wheel fixing ring, bearing pressure ring and other parts are made of the same material as the bearing. The worm gear box, encoder seat and bearing cover are made of 30SiC / Al material with a linear expansion coefficient similar to that of the bearing, which effectively avoids the mechanical transmission jamming caused by different linear expansion coefficients of materials under large temperature gradients.

[0029] 5. The worm gear is processed according to 7d level precision. Combined with motor control and encoder angle feedback, it can effectively ensure that the repeated positioning accuracy of the worm gear is no more than 20', and at the same time reduce the risk of transmission jamming of the worm gear under a wide temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the basic structure of a station conversion drive mechanism for detecting water ice content in a lunar soil water molecule analyzer of the present invention.

[0031] Figure 2 It is a schematic diagram of the worm assembly of the station conversion drive mechanism of the present invention.

[0032] Among them, 1 is a worm assembly, 2 is a worm wheel, 3 is a worm gear box, 4 is a first flat key, 5 is a rotating shaft, 6 is a first bearing pressure ring, 7 is a first bearing, 8 is a worm wheel fixing ring, 9 is a screw, 10 is a second flat key, 11 is a second bearing, 12 is an encoder, 13 is a second bearing pressure ring, 14 is an encoder seat, 101 is a motor, 102 is a worm, 103 is a third bearing, 104 is a fourth bearing, 105 is a third bearing pressure ring, 106 is a bearing cover, and 107 is a fourth bearing pressure ring. DETAILED DESCRIPTION

[0033] 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.

[0034] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0035] Example

[0036] See also Figure 1-2 , a station conversion drive mechanism for water ice content detection of a lunar soil water molecule analyzer, comprising a worm assembly 1, a worm wheel 2, a worm wheel box 3, a first flat key 4, a rotating shaft 5, a first bearing pressure ring 6, a first bearing 7, a worm wheel fixing ring 8, a screw 9, a second flat key 10, a second bearing 11, an encoder 12, a second bearing pressure ring 13 and an encoder seat 14;

[0037] The rotating shaft 5 is dynamically mounted with a first flat key 4, a first bearing 7, a worm wheel fixing ring 8, a second bearing 11 and an encoder 12. The first bearing 7 is statically connected to the worm gear box 3, the worm wheel fixing ring 8 is connected to the rotating shaft 5 via the second flat key 10, and the second bearing 11 is statically connected to the worm gear box 3 via the encoder seat 14; one end of the worm wheel 2 is statically connected to the worm wheel fixing ring 8 via a screw 9; the other end is meshed with the vertical axis of the worm assembly 1; the outer ring of the first bearing 7 is limited by the shoulder of the worm gear box 3, one end of the inner ring of the first bearing 7 is limited by the first bearing pressure ring 6, and one end is limited by the worm wheel fixing ring 8; one end of the outer ring of the second bearing 11 is limited by the second bearing pressure ring 13, and the other end is limited by the shoulder of the encoder seat 14, one end of the inner ring of the second bearing 11 is limited by the worm wheel fixing ring 8, and the other end is limited by the shaft shoulder of the rotating shaft 5; one end of the encoder 12 is statically connected to the encoder seat 14, and the other end is dynamically connected to the rotating shaft 5.

[0038] The worm assembly 1 includes a motor 101, a worm 102, a third bearing 103, a fourth bearing 104, a third bearing pressure ring 105, a bearing pressure cover 106 and a fourth bearing pressure ring 107. One end of the motor 101 is dynamically fitted in the flat hole of the worm 102 via the flat shaft of the motor rotor, and the other end is statically connected to the worm gear box 3; the third bearing 102 and the fourth bearing 103 of the motor are dynamically installed on the worm 102, the outer ring of the third bearing 103 is statically fitted on the worm gear box 3 via the fourth bearing pressure ring 107, the outer ring of the fourth bearing 104 is statically fitted on the worm gear box 3 via the bearing pressure cover 106, and the inner ring of the fourth bearing 104 is dynamically fitted on the worm 102 via the third bearing pressure ring 105.

[0039] It is preferred that the first bearing 7, the second bearing 11, the third bearing 103 and the fourth bearing 104 are all made of 9Cr18 material, wherein the first bearing 7 and the second bearing 11 are 71900C solid lubricating bearings installed back to back with a preload of 50N; the third bearing 103 and the fourth bearing 104 are 61900 solid lubricating bearings. The solid lubrication method used by the bearings can be well applied in the temperature range of -55℃~+35℃. The first bearing 7 and the second bearing 11 adopt a back-to-back preload method, which can increase the support stiffness of the shaft system, improve the bearing capacity of the shaft system and improve the rotation accuracy of the shaft system; the third bearing 103 and the fourth bearing 104 use small axial clearance deep groove ball bearings, which can release the axial deformation caused by the temperature gradient and reduce the risk of mechanical transmission jamming.

[0040] Preferably, the motor 101 is a J36BH003 solid-lubricated stepper motor with a pull-out torque greater than 0.15 N·m. The worm 102 is a right-handed Archimedean spiral worm made of 9Cr18, with the number of heads Z1=1, the module m=0.8 mm, and q=15. The module m of the worm wheel 2 is 0.8 mm, the number of teeth Z2=45, and the material is ZCuSn10Pb1. This transmission form has a compact structure, self-locking function, and a high torque amplification factor, which can ensure that the output torque of the mechanism is not less than 2.5 N·m.

[0041] The preferred material of the worm gear box 3, the encoder seat 14 and the bearing cover (106) is 30SiC / Al, and the material of the rotating shaft 5, the first bearing pressure ring 6, the worm gear fixing ring 8, the second flat key 10, the bearing pressure ring B215, the third bearing pressure ring 105 and the fourth bearing pressure ring 107 are all 9Cr18. Materials with matching linear expansion coefficients are selected as shaft system bearing structural parts, which effectively ensures that the mechanism can transmit well under temperature conditions of -55°C ~ +35°C.

[0042] The encoder 14 is preferably a DS-40 absolute encoder with a measurement accuracy of ±0.02°. The worm gear is processed according to 7d level precision. Combined with motor control and encoder angle feedback, it can ensure reliable transmission of the mechanism in a wide temperature range and the mechanism repeat positioning accuracy is no more than 20′.

[0043] When in use, the driving motor 101 rotates, and the worm 102 at the power output end rotates to drive the worm wheel 2 to realize rotational motion, and the rotating shaft 5 is driven to realize rotational motion under the support of the first bearing 7 and the second bearing 11. The torque is transmitted to the multi-sample holder assembly through the first flat key 4 installed on the rotating shaft 5, so that it can realize multi-station conversion. At the same time, combined with motor control and encoder angle feedback, the repeated positioning requirements of each station are effectively guaranteed.

[0044] The station conversion drive mechanism manufactured by the present invention can adapt to the temperature condition of -55℃~+35℃. The output torque under each temperature condition is greater than 3N·m. The repeat positioning accuracy of each station of the testing mechanism is within 15.3′, which meets the use requirements. In addition,

[0045] The organization has passed the environmental tests such as mechanical vibration test, thermal vacuum test and other environmental tests given for the satellite as a whole, and the reliability meets the requirements.

[0046] 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 station conversion drive mechanism for detecting water ice content in a lunar soil water molecule analyzer, characterized in that: It comprises a worm assembly (1), a worm wheel (2), a worm wheel box (3), a first flat key (4), a rotating shaft (5), a first bearing pressure ring (6), a first bearing (7), a worm wheel fixing ring (8), a screw (9), a second flat key (10), a second bearing (11), an encoder (12), a second bearing pressure ring (13) and an encoder seat (14); The rotating shaft (5) is dynamically mounted with a first flat key (4), a first bearing (7), a worm gear fixing ring (8), a second bearing (11) and an encoder (12); the first bearing (7) is statically connected to the worm gear box (3); the worm gear fixing ring (8) is connected to the rotating shaft (5) via a second flat key (10); and the second bearing (11) is statically connected to the worm gear box (3) via an encoder seat (14); One end of the worm wheel (2) is statically connected to the worm wheel fixing ring (8) via a screw (9); the other end is meshed with the vertical axis of the worm assembly (1); The outer ring of the first bearing (7) is limited by the shoulder of the worm gear box (3), one end of the inner ring of the first bearing (7) is limited by the first bearing pressure ring (6), and one end thereof is limited by the worm gear fixing ring (8); One end of the outer ring of the second bearing (11) is limited by the second bearing pressure ring (13), and the other end is limited by the shoulder of the encoder seat (14); one end of the inner ring of the second bearing (11) is limited by the worm gear fixing ring (8), and the other end is limited by the shoulder of the rotating shaft (5); One end of the encoder (12) is statically connected to the encoder seat (14), and the other end is dynamically connected to the rotating shaft (5).

2. A station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer as claimed in claim 1, characterized in that: The worm assembly (1) comprises a motor (101), a worm (102), a third bearing (103), a fourth bearing (104), a third bearing pressure ring (105), a bearing pressure cover (106) and a fourth bearing pressure ring (107); one end of the motor (101) is dynamically fitted in a flat hole of the worm (102) via a motor rotor flat shaft, and the other end is statically connected to a worm gear box (3); the third bearing (102) and the fourth bearing (103) of the motor are dynamically mounted on the worm (102); the outer ring of the third bearing (103) is statically fitted on the worm gear box (3) via a fourth bearing pressure ring (107); the outer ring of the fourth bearing (104) is statically fitted on the worm gear box (3) via a bearing pressure cover (106); and the inner ring of the fourth bearing (104) is dynamically fitted on the worm (102) via the third bearing pressure ring (105).

3. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The first bearing (7) and the second bearing (11) are 71900C solid lubrication bearings with a preload force of 50N, which are installed back to back and are made of 9Cr18.

4. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The third bearing (103) and the fourth bearing (104) are 61900 solid lubrication bearings, and the material is 9Cr18.

5. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The worm (102) is a right-handed Archimedean spiral worm, made of 9Cr18, with a number of threads Z1=1, a module m=0.8mm, and q=15.

6. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The module of the worm wheel (2) is m=0.8 mm, the number of teeth Z2=45, and the material is ZCuSn10Pb1.

7. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The motor (101) is a J36BH003 solid lubrication stepping motor, and its load-pulling torque is greater than 0.15 N·m.

8. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The encoder (12) is a DS-40 absolute encoder with a measurement accuracy of ±0.02°.

9. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The worm gear box (3), encoder seat (14) and bearing cover (106) are made of 30SiC / Al.

10. The station conversion drive mechanism for detecting water ice content of a lunar soil water molecule analyzer according to claim 1, characterized in that: The first flat key (4), the rotating shaft (5), the first bearing pressure ring (6), the worm gear fixing ring (8), the second flat key (10), the second bearing pressure ring (13), the third bearing pressure ring (105) and the fourth bearing pressure ring (107) are all made of 9Cr18 material.

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