Movable baffle plate for radiometric calibration in vacuum circular mould equipment

Abstract

The invention provides a movable baffle plate for radiometric calibration in vacuum circular mould equipment, which is provided with a base, a movable baffle plate module, a driving guide module, a limiting module and a control module, the base is fixed on a bottom test platform of space environment simulation test equipment, and the movable baffle plate module comprises a framework and an expansion plate heat sink, the framework is used for providing support for the expansion plate heat sink, a rack is arranged below the framework, rolling wheels are symmetrically arranged on the two sides of the rack, the driving guide module is provided with a vacuum motor, a commutator and a gear, the vacuum motor provides power for the gear, and the gear is matched with the rack on the framework. The technical problem that the accuracy of a radiometric calibration result is reduced due to the fact that an existing large spaceflight device or an on-orbit camera is easily affected by blackbody temperature rise radiation when carrying out radiometric calibration is solved. The device can be widely applied to vacuum circular mould equipment tests.

Description

TECHNICAL FIELD

[0001] The present application relates to a vacuum ring module device, in particular to a movable baffle for radiation calibration in a vacuum ring module device. BACKGROUND

[0002] It is of great significance to improve the reliability of space products to carry out sufficient space environment simulation tests on the ground and expose various potential defects of products such as on-orbit cameras before launch. When a large space device or an on-orbit camera (hereinafter referred to as a product) is subjected to radiation calibration, the blackbody radiation will affect the product body during the blackbody warming process, thereby affecting the accuracy of the radiation calibration results. SUMMARY

[0003] The present application provides a movable baffle for radiation calibration in a vacuum ring module device, which is placed between the blackbody and the product, can effectively shield the thermal radiation of the blackbody warming process on the product, and improves the accuracy of the radiation calibration results of the product.

[0004] To this end, the technical solution of the present application is a movable baffle for radiation calibration in a vacuum ring module device, which is provided with a base, a movable baffle module, a driving and guiding module, a limiting module, and a control module. The base is fixed on the bottom test platform of a space environment simulation test device. The movable baffle module includes a skeleton and an expanded plate heat sink. The skeleton is used to provide support for the expanded plate heat sink. A rack is arranged below the skeleton, and symmetrical rollers are arranged on both sides of the rack. The driving and guiding module is provided with a vacuum motor, a commutator, and a gear. The vacuum motor provides power for the gear, and the gear cooperates with the rack on the skeleton. The limiting module is used to limit the movement trajectory of the rollers, and the control module is used to control the operation of the vacuum motor and the commutator.

[0005] Preferably, the movable baffle module has two left and right movable baffle modules, and each movable baffle module is matched with a driving and guiding module.

[0006] Preferably, the driving and guiding module further includes a backup vacuum motor and a speed reducer. The speed reducer is fixed on a motor support. The vacuum motor and the backup vacuum motor are both connected with the commutator. The commutator is connected with the speed reducer, and the speed reducer is provided with the gear on the output end.

[0007] Preferably, a heating film is arranged on the speed reducer.

[0008] Preferably, the rolling wheel comprises a bottom guide rolling wheel and a side limiting rolling wheel, the limiting module comprises a horizontal bottom surface and a side upper baffle, the guide rolling wheel is in rolling contact with the horizontal bottom surface, and the limiting rolling wheel is in rolling contact with the side surface of the side upper baffle.

[0009] Preferably, the base is provided with a set of anti-collision limiting structures at both ends, the anti-collision limiting structure is provided with a limiting block, the inner side of the limiting block is provided with a polytetrafluoroethylene pad, the upper side of the limiting block is provided with a mounting plate, the mounting plate is provided with a limiting switch, the limiting switch is a contact type break limiting switch, and the contact type break limiting switch is electrically connected with the control module.

[0010] Preferably, the rolling wheel is sleeved on a connecting shaft, the connecting shaft is provided with a bearing seat on both sides of the rolling wheel, the bearing seat is provided with a bearing, the outer ring of the bearing is provided with a heat insulation polytetrafluoroethylene outer ring, and the bearing seat is provided with a heat insulation polytetrafluoroethylene plate.

[0011] Preferably, the expansion plate heat sink is connected with a liquid supply pipe, the liquid supply pipe supplies liquid nitrogen for the expansion plate heat sink, one side of the movable baffle module facing the black body is subjected to radiation shielding treatment, and the side of the movable baffle module facing the product is sprayed with black paint.

[0012] Preferably, the height of the base is less than or equal to 350 mm, and the motor support is fixed on the base.

[0013] The application has the following beneficial effects,

[0014] (1) The movable baffle is arranged between the product and the black body, so that the movable baffle can be closed to separate the product and the black body during the temperature rising of the black body, the influence of the temperature rising of the black body on the product is avoided, and the accuracy of radiation calibration is improved.

[0015] (2) The movable baffle module is driven by a vacuum motor as a power source and is transmitted through a speed reducer, and finally a rack at the lower part of a gear frame is driven by a gear to drive the movable baffle module to move in a certain direction, a reversing device is further arranged on the driving guide module, so that reciprocating movement of the movable baffle module is realized, the movable baffle module is opened and closed, and the vacuum motor and the reversing device are remotely controlled through the control module.

[0016] (3) The limiting module is arranged to limit the rolling wheel to run in a specific track, so that the left and right movable baffle modules move along the predetermined route, the combination and separation of the two movable baffle modules are realized, and the anti-collision limiting structure can avoid the two movable baffle modules from running out of the predetermined track, thereby protecting the movable baffle modules.

[0017] (4) due to the low temperature environment, the rotating bearing clearance is reduced, the friction is increased, the movement mechanism is easily blocked, the heat insulation four fluorine outer ring is installed on the bearing outer ring, the four fluorine heat insulation plate is installed in the bearing seat, the influence of low temperature on bearing clearance and rotation is solved, and the operation reliability of the driving guide module is improved;

[0018] (5) the gear of the driving guide module and the rack of the moving baffle module are matched to realize motion transmission, and the bearing capacity is large, the transmission precision and transmission speed are high compared with the screw. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a three-dimensional structure schematic diagram of the embodiment of the application;

[0020] Figure 2 is Figure 1 the local enlarged sectional view of A in figure;

[0021] Figure 3 is another three-dimensional structure schematic diagram of the embodiment of the application;

[0022] Figure 4 is a forward structure schematic diagram of the embodiment of the application;

[0023] Figure 5 is Figure 4 the local enlarged schematic diagram of I in figure;

[0024] Figure 6 is Figure 4 the local enlarged schematic diagram of II in figure;

[0025] Figure 7 is a side structure schematic diagram of the embodiment of the application;

[0026] Figure 8 is Figure 7 the local enlarged schematic diagram of B in figure;

[0027] Figure 9 is a three-dimensional structure schematic diagram of the driving guide module of the embodiment of the application.

[0028] Explanation of symbols in the figure:

[0029] 1. heating cage; 2. low temperature baffle; 3. heating cage cable metal tank chain; 4. integral frame; 5. low temperature baffle tank chain; 6. skeleton; 7. rack; 8. gear; 9. limit roller; 10. guide roller; 11. side upper baffle; 12. horizontal bottom surface; 13. backup vacuum motor; 14. commutator; 15. vacuum motor; 16. heating film; 17. motor support; 18. speed reducer. DETAILED DESCRIPTION

[0030] The application will be further described in connection with the following examples.

[0031] As Figures 1-8 A movable baffle for radiation calibration in a vacuum ring mold device is provided with a movable baffle module 2, a driving guide module, a limiting module, a collision prevention module, and a control module. One side of the movable baffle module 2 is a black body, and the other side is a large space device or an on-orbit camera (hereinafter collectively referred to as a product). During the test process, the movable baffle can be effectively opened and closed according to the calibration requirements. The black body is provided with a heating cage 1, and the heating cage 1 is connected with a heating cage cable metal tank chain 3. The movable baffle module 2 is connected with a baffle tank chain 5. The black body and the movable baffle module 2 are both installed on an overall frame 4. The movable baffle module 2 has left and right two, and each movable baffle module 2 is matched with a driving guide module. The movable baffle module 2 makes linear reciprocating motion on the horizontal plane through the driving guide module, and at the same time has functions of power-off locking after reaching the position, collision prevention and protection, anti-overturning design, maintainability design, safety protection function, and remote communication interface, etc.

[0032] The bottom of the overall frame 4 is a base, which is fixed on the bottom test platform of the space environment simulation test device. The height of the base is ≤350mm. The base is made by welding I-beam. Because the outer surface area is large, the outgassing area is large in the vacuum environment, so the outgassing amount will also be large. The excessive outgassing amount will affect the achievement of the working vacuum of the vacuum container and increase the pumping load of the vacuum air pump set. Therefore, before the I-beam is welded and formed, the outer surface of all plates is mechanically polished to remove the organic contaminants on the surface of the plates, and then it is welded and formed. The important processing dimensions are finished after welding to reduce the outgassing of the base in the vacuum environment.

[0033] The movable baffle module 2 includes a skeleton 6 and an expanded plate heat sink. The skeleton 6 is used to provide support for the expanded plate heat sink. The expanded plate heat sink is connected with a liquid supply pipe, which provides liquid nitrogen for the expanded plate heat sink. The expanded plate heat sink provides a 100K cold black background for radiation calibration and tests the thermal radiation of the product body through the liquid nitrogen provided by the liquid inlet pipe. In addition, during the process of raising and lowering the temperature of the black body to stability, the black body effectively shields the radiation of the product to avoid the temperature change of the product caused by the radiation of the black body, which affects its performance. The movable baffle module 2 is installed with a temperature measuring platinum resistance. The surface of all structural parts is smooth and easy to clean, and there is no closed space. All elements meet the optical requirements without oil pollution. The liquid nitrogen pipeline of the movable baffle module 2 does not contain a live joint. The side facing the black body is treated with radiation shielding, and the side facing the product is sprayed with special black paint for heat sinks, which does not fall off for a long time. The two sides of the movable baffle module 2 are effectively insulated and radiatively insulated. The lifting points of the movable baffle module 2 have obvious marks, and a matching lifting device is provided.

[0034] As Figure 9As shown, the driving and guiding module is provided with a vacuum motor 15, a reverser 14, a backup vacuum motor 13, a speed reducer 18 and a gear 8, the vacuum motor 15 or the backup vacuum motor 13 provides power for the gear 8, the speed reducer 18 is fixed on a motor support 17, the motor support 17 is fixed on a base, a heating film 16 is arranged on the speed reducer 18, the heating film 16 is used for heating the driving and guiding module to reduce the influence of low temperature environment on the performance of the driving and guiding module. The vacuum motor 15 and the backup vacuum motor 13 are connected with the reverser 14, the reverser 14 is connected with the speed reducer 18, the gear 8 is sleeved on the output end of the speed reducer 18, and the control module can control the working of the vacuum motor 15, the backup vacuum motor 13 and the reverser 18. In order to improve the operation reliability, the driving and guiding module needs to be tested in a low temperature environment, and the transmission components thereof are subjected to vacuum lubrication treatment, and a lubricating material with low vapor pressure and low outgassing rate is selected. The vacuum motor 15 and the backup vacuum motor 13 are both provided with an integrated electromagnetic brake, which is used for realizing power-off locking: when the power is off, the brake coil loses power, the electromagnetic force disappears, the spring force pushes the brake pad to press the friction surface, the friction force locks the rotor firmly, and the locking function is realized. The control module is used for increasing the mutual exclusion function of the vacuum motor and the backup vacuum motor, so that the two sets of driving and guiding modules cannot appear at the same position at the same time, and the collision of the two movable baffle modules 2 is avoided.

[0035] A rack 7 is arranged below the framework 6, the gear 8 cooperates with the rack 7 on the framework 6, the movement of the gear 8 drives the movement of the rack 7, and then drives the movement of the movable baffle module 2, the movement transmission is realized through the mutual meshing of the gear 8 and the rack 7, and the bearing capacity is large, and the transmission precision and transmission speed are high relative to the lead screw. Rollers are symmetrically arranged on both sides of the rack 7, the rollers include guide rollers 10 at the bottom and limiting rollers 9 at the sides, a limiting module includes a horizontal bottom surface 12 and a side upper baffle 11, the guide rollers 10 are in rolling contact with the horizontal bottom surface 12, and the limiting rollers 9 are in rolling contact with the side surface of the side upper baffle 11. Through the limiting module, the rollers can be limited to run in a specific track, and then drive the left and right movable baffle modules 2 to move along the predetermined route, so as to realize the merging and separation of the two movable baffle modules 2. The movable baffle module 2 is powered by the vacuum motor 15 or the backup vacuum motor 13, and the power is transmitted through the speed reducer 18, and finally the gear 8 drives the rack 7 at the lower part of the framework 6 to drive the movable baffle module 2 to move in a certain direction. The driving and guiding module is also provided with a reverser 14, and then the reciprocating motion of the movable baffle module 2 can be realized, the movable baffle module 2 can be opened and closed, and the vacuum motor 15 and the reverser 18 can be remotely controlled through the control module. The upper part of the framework 6 is also provided with the same rollers and limiting modules as the lower part, so as to reduce the movement resistance of the movable baffle module 2.

[0036] The base is provided with a set of anti-collision limiting mechanism at each end, which is used to prevent the movable baffle module 2 from moving beyond the predetermined range. Specifically, the anti-collision limiting mechanism comprises a limiting block, the inner side of which is provided with a polytetrafluoroethylene pad, which can play a buffering role. An installation plate is further arranged above the limiting block, which is used to install a limiting switch. According to the use experience of the limiting switch in the vacuum low-temperature environment in the past, various types of mechanical limiting switches all have low reliability, and are prone to be stuck in the low-temperature environment. Therefore, the limiting switch of the present application adopts a contact type break limiting switch, which has a simple structure and higher reliability. The design of the anti-collision module can avoid collision when the two movable baffle modules 2 move towards each other, and plays a protective role for the movable baffle module 2.

[0037] The roller is sleeved on the connecting shaft, and the connecting shaft is provided with a bearing seat on both sides of the roller. The bearing seat is provided with a bearing. Since the rotating bearing clearance is reduced and the friction is increased in the low-temperature environment, the movement mechanism is prone to be blocked. The present application installs a heat-insulating four-fluorine outer ring on the outer ring of the bearing and installs a four-fluorine heat-insulating plate in the bearing seat, thereby solving the influence of low temperature on the bearing clearance and rotation, improving the operation reliability of the driving and guiding module, and at the same time, after all bearings and connecting shafts are assembled, liquid nitrogen immersion low-temperature test is carried out. After immersion in liquid nitrogen for one hour, whether the bearing rotation is flexible or not and whether there is a jamming phenomenon is tested, thereby further improving the operation reliability.

[0038] The control module measures the opening / closing state, temperature data and working state parameters of the movable baffle module in real time, and displays the collected data in the human-computer interaction interface in real time. The control module has a system self-checking, fault judgment and alarm protection program, which detects the running state of each controlled object in real time, detects the fault state in real time, discovers the fault in time, and automatically executes the protection program according to the fault level once the fault occurs.

[0039] The present application can work in a cold black vacuum environment with a temperature less than 100K and a vacuum degree less than 1E-5Pa, and is used for radiation calibration of large-scale space devices or on-orbit cameras. When the product performs radiation calibration in a vacuum low-temperature environment, the movable baffle module 2 is placed between the black body and the product. The temperature range of the black body during calibration is 150K-400K. The movable baffle module 2 is closed during the temperature rising process of the black body, so as to separate the product and the black body and avoid the influence of the temperature rising of the black body on the product. After the black body reaches the set temperature, the product first collects the radiation signal of the movable baffle, acquires the thermal radiation of the product body, and deducts it in the calibration data, thereby improving the accuracy of radiation calibration.

[0040] The above is only a specific embodiment of the present application, which cannot limit the scope of the present application. Therefore, the replacement of equivalent components or equivalent changes and modifications made within the scope of the patent protection of the present application shall still fall within the scope of the claims of the present application.

Claims

1. A movable baffle for radiation calibration in a vacuum ring mold apparatus, characterized by, The base is fixed on the bottom test platform of the space environment simulation test equipment, the movable baffle module comprises a framework and an expanded plate heat sink, the framework is used for providing support for the expanded plate heat sink, a rack is arranged below the framework, symmetrical roller is arranged on both sides of the rack, the drive guide module is provided with a vacuum motor, a reverser and a gear, the vacuum motor provides power for the gear, and the gear is matched with the rack on the framework; the limiting module is used for limiting the movement track of the roller, and the control module is used for controlling the working of the vacuum motor and the reverser.

2. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, wherein, The movable baffle module has left and right two, and each movable baffle module is matched with a drive guide module.

3. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, wherein, The drive guide module further comprises a backup vacuum motor and a speed reducer, the speed reducer is fixed on the motor support, the vacuum motor and the backup vacuum motor are connected with the reverser, the reverser is connected with the speed reducer, and the speed reducer is provided with the gear.

4. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 3, wherein, The speed reducer is provided with a heating film.

5. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, wherein, The roller comprises a guide roller at the bottom and a limiting roller at the side, the limiting module comprises a horizontal bottom surface and a side upper baffle, the guide roller is in rolling contact with the horizontal bottom surface, and the limiting roller is in rolling contact with the side surface of the side upper baffle.

6. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, wherein, Each end of the base is provided with a set of anti-collision limiting structure, the anti-collision limiting structure is provided with a limiting block, the inner side of the limiting block is provided with a polytetrafluoroethylene pad, the upper side of the limiting block is provided with a mounting plate, the mounting plate is provided with a limiting switch, the limiting switch is a contact type open circuit limiting switch, and the contact type open circuit limiting switch is electrically connected with the control module.

7. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, wherein The roller is sleeved on the connecting shaft, bearings are arranged in the bearing seats on both sides of the connecting shaft, heat insulation polytetrafluoroethylene outer rings are arranged on the outer rings of the bearings, and heat insulation polytetrafluoroethylene plates are arranged in the bearing seats.

8. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 1, wherein, The expanded plate heat sink is connected with a liquid supply pipe, the liquid supply pipe supplies liquid nitrogen for the expanded plate heat sink, one side of the movable baffle module facing the black body is subjected to radiation shielding treatment, and the side of the movable baffle module facing the product is sprayed with black paint.

9. The movable baffle for radiation calibration in a vacuum ring mold apparatus according to claim 3, wherein, The height of the base is less than or equal to 350 mm, and the motor support is fixed on the base.

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