Fatigue test system and fatigue life test method for rotating mirror driving mechanism

Abstract

The invention relates to the technical field of rotating mirrors for thermonuclear fusion devices, and discloses a rotating mirror driving mechanism fatigue test system and a fatigue life test method, which are used for the fatigue test of a rotating mirror driving mechanism for a thermonuclear fusion device, and the rotating mirror driving mechanism comprises a driving motor and a transmission assembly, the driving motor can drive the rotating mirror to rotate through the transmission assembly, and the rotating mirror driving mechanism fatigue test system comprises a laser tracker, a target ball and an encoder. The target ball is arranged on the rotating mirror. The laser tracker is used for cooperating with the target ball to monitor the position of the rotating mirror. The encoder is arranged on the driving motor and used for detecting the angular displacement of a rotating shaft of the driving motor. According to the rotating mirror driving mechanism fatigue test system and the fatigue life test method, the driving precision of the rotating mirror driving mechanism to the rotating mirror can be accurately judged, and the requirement for fatigue test of the rotating mirror driving mechanism is met.

Description

Technical Field

[0001] The present invention relates to the technical field of rotating mirrors for thermonuclear fusion devices, and particularly to a fatigue test system for a rotating mirror drive mechanism and a fatigue life test method. Background Art

[0002] Electromagnetic waves in the millimeter-wave band have relatively high energy. A millimeter-wave antenna can accurately transmit millimeter-wave energy to the plasma region in a thermonuclear fusion device. In a thermonuclear fusion device, it is often necessary to concentrate millimeter-wave energy in a specific direction and region. By controlling the phase and amplitude of each antenna element in the antenna array, the electromagnetic waves radiated by each element interfere and superimpose in space, thereby forming a beam with a specific shape and directivity. The beam can be scanned within a certain angle range to accurately direct the millimeter-wave energy to a specific position in the plasma for operations such as heating and diagnosis. A rotating mirror is a core component in the millimeter-wave antenna and is used to reflect millimeter waves to a specified position within a certain angle range and with a certain accuracy. Therefore, a drive mechanism is required to drive the rotating mirror to complete the rotation of the mirror surface.

[0003] The temperature inside the thermonuclear fusion device is extremely high. One end of the drive mechanism used to drive the rotation of the rotating mirror extends into the fusion chamber of the fusion device to drive the rotating mirror, while the other end extends out of the fusion chamber and is connected to a drive motor. Since the inside of the fusion chamber is a vacuum environment, the outer shell of the drive mechanism is hermetically connected to the thermonuclear fusion device, and a sealed cavity is provided inside the drive structure to prevent the fusion chamber from communicating with the outside through the drive mechanism, resulting in the inability to maintain a vacuum environment in the fusion chamber.

[0004] In the development of conventional drive mechanisms in the past, due to the less severe environment compared to the fusion reactor environment and the relatively convenient maintenance, the parameter requirements for the number of fatigue life cycles and angular accuracy are far less strict than those for the rotating mirror drive mechanism in a thermonuclear fusion device. Moreover, conventional drive mechanisms do not need to consider the problem of vacuum sealing, resulting in the inability of existing fatigue test systems for drive mechanisms to meet the fatigue test requirements of the rotating mirror drive mechanism in a thermonuclear fusion device.

[0005] Therefore, there is an urgent need for a fatigue test system for a rotating mirror drive mechanism and a fatigue life test method to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a fatigue test system for a rotating mirror drive mechanism and a fatigue life test method, which can accurately judge the driving accuracy of the rotating mirror drive mechanism for the rotating mirror and meet the needs of the fatigue test of the rotating mirror drive mechanism.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A fatigue test system for a rotating mirror drive mechanism, which is used for the fatigue test of the rotating mirror drive mechanism of a thermonuclear fusion device. The rotating mirror drive mechanism includes a drive motor and a transmission assembly. The drive motor can drive the rotation of the rotating mirror through the transmission assembly. The fatigue test system for the rotating mirror drive mechanism includes a laser tracker, a target ball, and an encoder;

[0009] The target ball is arranged on the rotating mirror;

[0010] The laser tracker is used to cooperate with the target ball to monitor the position of the rotating mirror;

[0011] The encoder is arranged on the drive motor and is used to detect the angular displacement of the rotating shaft of the drive motor.

[0012] As an improvement of the above technical solution, a plurality of target balls are provided, and the plurality of target balls are arranged on the rotating mirror at intervals.

[0013] As an improvement of the above technical solution, the rotating mirror is quadrilateral, and one target ball is arranged in each of the four vertex regions of the rotating mirror.

[0014] As an improvement of the above technical solution, the rotating mirror drive mechanism further includes a housing. There is a sealed cavity in the housing. Part of the transmission assembly is located in the sealed cavity, and both ends of the transmission assembly in the length direction are exposed outside the housing. A suction joint is arranged on the housing, and the suction joint communicates the sealed cavity with the outside of the housing;

[0015] The fatigue test system for the rotating mirror drive mechanism further includes a leak detector, and the leak detector is used to be connected to the suction joint to detect the sealed cavity.

[0016] As an improvement of the above technical solution, a first cooling flow channel is arranged in the housing;

[0017] The rotating mirror includes a mirror body and a cooling plate fixedly attached to the back of the mirror body. A second cooling flow channel is arranged in the cooling plate, and the target balls are all arranged on the mirror body;

[0018] The rotating mirror drive mechanism further includes a connecting pipe, a coolant supply pipe, and a coolant return pipe. The connecting pipe connects the housing and the cooling plate. A connecting flow channel is arranged in the connecting pipe, and the connecting flow channel communicates the first cooling flow channel with the second cooling flow channel. One end of both the coolant supply pipe and the coolant return pipe is connected to the housing. A liquid supply flow channel is arranged in the coolant supply pipe, and a liquid return flow channel is arranged in the coolant return pipe;

[0019] The first cooling flow channel, the second cooling flow channel, the connecting flow channel, the liquid supply flow channel, and the liquid return flow channel form a cooling flow channel group.

[0020] As an improvement of the above technical solution, the leak detector is also used to be connected to the coolant supply pipe or the coolant return pipe to detect the cooling channel group.

[0021] As an improvement of the above technical solution, it further includes a coolant supply device, and the coolant supply device is used to be connected to the coolant supply pipe to supply coolant into the cooling channel group.

[0022] As an improvement of the above technical solution, it further includes a nitrogen supply device, and the nitrogen supply device is used to be connected to the coolant supply pipe or the coolant return pipe to blow dry the cooling channel group.

[0023] A fatigue life test method for a rotating mirror drive mechanism, using the rotating mirror drive mechanism fatigue test system described in any one of the above to conduct a fatigue life test on the rotating mirror drive mechanism for a thermonuclear fusion device, including:

[0024] Conduct a round of fatigue test on the rotating mirror drive mechanism and conduct a judgment on the fatigue test of the rotating mirror drive mechanism in this round;

[0025] The fatigue test of the rotating mirror drive mechanism includes:

[0026] Control the driving motor to drive the rotating mirror to reciprocate between the first design limit position and the second design limit position for multiple times;

[0027] Select multiple driving accuracy monitoring positions within the rotation range of the rotating mirror, and the multiple driving accuracy monitoring positions include the first design limit position and the second design limit position;

[0028] After the driving motor drives the rotating mirror to reciprocate between the first design limit position and the second design limit position for multiple times, control the driving motor to drive the rotating mirror to rotate to each driving accuracy monitoring position in sequence, and respectively monitor the driving accuracy deviation of the rotating mirror at each driving accuracy monitoring position. The maximum value of the absolute value of the driving accuracy deviation of the rotating mirror at each driving accuracy monitoring position is the maximum driving accuracy deviation of the fatigue test of the rotating mirror drive mechanism in this round;

[0029] The judgment on the fatigue test of the rotating mirror drive mechanism in this round includes:

[0030] If the maximum driving accuracy deviation in the fatigue test of the rotating mirror drive mechanism in this round is not greater than the preset driving accuracy deviation value, conduct the next round of fatigue test on the rotating mirror drive mechanism;

[0031] If the maximum driving accuracy deviation in the fatigue test of the rotating mirror drive mechanism in this round is greater than the preset driving accuracy deviation value, the fatigue life test of the rotating mirror drive mechanism terminates;

[0032] If, during the fatigue test of the rotating mirror drive mechanism in this round, when the control drive motor drives the rotating mirror to rotate to each drive accuracy monitoring position in sequence, the absolute value of the difference between the actual angular displacement of the drive motor and the theoretical angular displacement of the drive motor corresponding to this drive accuracy monitoring position is greater than the preset angular displacement deviation value of the drive motor, then the fatigue life test of the rotating mirror drive mechanism terminates;

[0033] Repeat the above process until the fatigue life test of the rotating mirror drive mechanism terminates;

[0034] If the fatigue test of the rotating mirror drive mechanism terminates after the m-th round of the fatigue test of the rotating mirror drive mechanism, then the fatigue life of the rotating mirror drive mechanism is equal to the sum of the reciprocating rotation times of the rotating mirror during the first round of the fatigue test of the rotating mirror drive mechanism to the (m - 1)-th round of the fatigue test of the rotating mirror drive mechanism, where m is a positive integer greater than 1.

[0035] As an improvement of the above technical solution, during the fatigue tests of the rotating mirror drive mechanism in the first round and the second round, the number of reciprocating rotations of the drive motor driving the rotating mirror is equal to the preset number;

[0036] During the n-th round of the fatigue test of the rotating mirror drive mechanism, if the maximum value of the drive accuracy deviation in the (n - 1)-th round of the fatigue test of the rotating mirror drive mechanism is greater than the maximum value of the drive accuracy deviation in the (n - 2)-th round of the fatigue test of the rotating mirror drive mechanism, then the number of reciprocating rotations of the drive motor driving the rotating mirror in the n-th round of the fatigue test of the rotating mirror drive mechanism is less than the number of reciprocating rotations of the drive motor driving the rotating mirror in the (n - 1)-th round of the fatigue test of the rotating mirror drive mechanism; if the maximum value of the drive accuracy deviation in the (n - 1)-th round of the fatigue test of the rotating mirror drive mechanism is not greater than the maximum value of the drive accuracy deviation in the (n - 2)-th round of the fatigue test of the rotating mirror drive mechanism, then the number of reciprocating rotations of the drive motor driving the rotating mirror in the n-th round of the fatigue test of the rotating mirror drive mechanism is equal to the number of reciprocating rotations of the drive motor driving the rotating mirror in the (n - 1)-th round of the fatigue test of the rotating mirror drive mechanism, where n is a positive integer greater than 2.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] The fatigue test system and fatigue life test method for the rotating mirror driving mechanism of the present invention monitor the position of the rotating mirror through a laser tracker cooperating with a target ball, and monitor the angular displacement of the rotating shaft of the driving motor through an encoder. Multiple driving accuracy monitoring positions are selected within the rotation range of the rotating mirror to conduct multiple rounds of fatigue tests on the rotating mirror driving mechanism. In each round of fatigue test of the rotating mirror driving mechanism, the driving motor drives the rotating mirror to reciprocate multiple times through a transmission component, and then controls the driving motor to drive the rotating mirror to rotate to each driving accuracy monitoring position in sequence. The laser tracker detects the actual position of the rotating mirror, and the encoder detects the actual angular displacement of the rotating shaft of the driving motor. The maximum value of the absolute value of the driving accuracy deviation of the rotating mirror at each driving accuracy monitoring position is the maximum driving accuracy deviation of this round of fatigue test of the rotating mirror driving mechanism. If the maximum driving accuracy deviation is greater than the preset driving accuracy deviation value, the fatigue life test of the rotating mirror driving mechanism terminates. And, if in a certain round of fatigue test of the rotating mirror driving mechanism, the absolute value of the difference between the actual angular displacement of the driving motor and the theoretical angular displacement of the driving motor corresponding to this driving accuracy monitoring position is greater than the preset angular displacement deviation value of the driving motor, the fatigue life test of the rotating mirror driving mechanism terminates. The fatigue test system and fatigue life test method for the rotating mirror driving mechanism provided by the present invention can accurately judge the driving accuracy of the rotating mirror driving mechanism for the rotating mirror, effectively ensure the test accuracy of the fatigue life test of the rotating mirror driving mechanism, and meet the needs of the fatigue test of the rotating mirror driving mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of the fatigue test system for the rotating mirror driving mechanism provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic structural diagram of the rotating mirror driving mechanism provided by an embodiment of the present invention Figure 1 ;

[0041] Figure 3 is a schematic structural diagram of the rotating mirror driving mechanism provided by an embodiment of the present invention Figure 2 ;

[0042] Figure 4 is a cross-sectional view of a part of the rotating mirror driving mechanism provided by an embodiment of the present invention Figure 1 ;

[0043] Figure 5 is a cross-sectional view of a part of the rotating mirror driving mechanism provided by an embodiment of the present invention Figure 2 ;

[0044] Figure 6 is a flowchart of the fatigue life test method for the rotating mirror driving mechanism provided by an embodiment of the present invention;

[0045] Figure 7It is a flowchart of the fatigue test of the rotating mirror driving mechanism in the method for testing the fatigue life of the rotating mirror driving mechanism provided by the embodiment of the present invention.

[0046] In the figure:

[0047] 1. Rotating mirror driving mechanism;

[0048] 11. Driving motor;

[0049] 12. Transmission component; 121. Reducer; 122. Eccentric rod; 123. Rotating rod; 124. Cross-axis transmission mechanism; 125. Worm and worm gear; 126. Sealing pipe; 127. Magnetic fluid sealing device; 128. Connection component;

[0050] 13. Housing; 131. Sealing cavity; 132. Suction joint; 133. First cooling channel; 1331. First sub-channel; 1332. Second sub-channel; 134. Cooling sleeve; 135. Fixed sleeve;

[0051] 14. Connecting pipe; 141. First sub-connecting pipe; 142. Second sub-connecting pipe; 15. Coolant supply pipe; 16. Coolant return pipe;

[0052] 17. First mounting seat; 18. Second mounting seat;

[0053] 10. Laser tracker;

[0054] 20. Target ball;

[0055] 30. Leak detector;

[0056] 40. Coolant supply equipment;

[0057] 100. Rotating mirror; 1001. Mirror body; 1002. Cooling plate. Detailed implementation manners

[0058] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0059] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0060] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0061] In the description of this embodiment, the orientation or positional relationship terms such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0062] As Figure 1 shown, this embodiment provides a fatigue test system for a rotating mirror drive mechanism, which is used for the fatigue test of the rotating mirror drive mechanism 1 for a thermonuclear fusion device. The rotating mirror drive mechanism 1 includes a drive motor 11 and a transmission assembly 12. The drive motor 11 can drive the rotating mirror 100 to rotate through the transmission assembly 12. The fatigue test system for the rotating mirror drive mechanism includes a laser tracker 10, a target ball 20 and an encoder. The target ball 20 is arranged on the rotating mirror 100. The laser tracker 10 is used to cooperate with the target ball 20 to monitor the position of the rotating mirror 100. The encoder is arranged on the drive motor 11 and is used to detect the angular displacement of the rotating shaft of the drive motor 11.

[0063] The fatigue test system for the rotating mirror drive mechanism provided in this embodiment monitors the position of the rotating mirror 100 through the laser tracker 10 in cooperation with the target ball 20, and monitors the angular displacement of the rotating shaft of the drive motor 11 through the encoder. Multiple drive accuracy monitoring positions are selected within the rotation range of the rotating mirror 100, and multiple rounds of fatigue tests of the rotating mirror drive mechanism 1 are carried out. In each round of fatigue test of the rotating mirror drive mechanism 1, the drive motor 11 drives the rotating mirror 100 to reciprocate multiple times through the transmission assembly 12, and then controls the drive motor 11 to drive the rotating mirror 100 to rotate to each drive accuracy monitoring position in sequence. The laser tracker 10 detects the actual position of the rotating mirror 100, and the encoder detects the actual angular displacement of the rotating shaft of the drive motor 11. The maximum value of the absolute value of the drive accuracy deviation of the rotating mirror 100 at each drive accuracy monitoring position is the maximum value of the drive accuracy deviation of this round of fatigue test of the rotating mirror drive mechanism 1. If the maximum value of the drive accuracy deviation is greater than the preset drive accuracy deviation value, the fatigue life test of the rotating mirror drive mechanism 1 terminates. And, if in a certain round of fatigue test of the rotating mirror drive mechanism 1, the absolute value of the difference between the actual angular displacement of the drive motor 11 and the theoretical angular displacement of the drive motor 11 corresponding to this drive accuracy monitoring position is greater than the preset angular displacement deviation value of the drive motor, the fatigue life test of the rotating mirror drive mechanism 1 terminates. The laser tracker 10 in cooperation with the target ball 20 can accurately monitor the position of the rotating mirror 100, ensure the position monitoring accuracy of the rotating mirror 100, and thus ensure the judgment error of the rotation accuracy of the rotating mirror 100 in the fatigue test of the rotating mirror drive mechanism. Since the drive motor 11 rotates multiple circles before the rotating mirror 100 can rotate once within the rotation range, for the drive motor 11, the encoder can already ensure the angular displacement monitoring accuracy of the rotating shaft of the drive motor 11. Through the above settings, the fatigue test system for the rotating mirror drive mechanism provided in this embodiment can accurately judge the drive accuracy of the rotating mirror drive mechanism 1 for the rotating mirror 100, effectively ensure the test accuracy of the fatigue life test of the rotating mirror drive mechanism 1, and meet the needs of the fatigue test of the rotating mirror drive mechanism 1.

[0064] In this embodiment, the model of the laser tracker 10 is Leica AT960, and the model of the leak detector 30 is INFICON UL1000. The specific method of setting the encoder on the drive motor to detect the angular displacement of the drive motor is the prior art in this field and will not be elaborated here.

[0065] Furthermore, as Figure 1 shown, a plurality of target balls 20 are provided, and the plurality of target balls 20 are arranged at intervals on the rotating mirror 100. The arrangement of the plurality of target balls 20 enables the laser tracker 10 to better track the position of the rotating mirror 100. In this embodiment, the rotating mirror 100 is quadrilateral, and a target ball 20 is arranged in each of the four vertex regions of the rotating mirror 100.

[0066] As Figures 1-5As shown, the rotating mirror drive mechanism 1 in this embodiment further includes a housing 13. A sealed cavity 131 is provided inside the housing 13. Part of the transmission assembly 12 is located inside the sealed cavity 131, and both ends of the transmission assembly 12 in the length direction are exposed outside the housing 13. A suction joint 132 is provided on the housing 13, and the suction joint 132 communicates the sealed cavity 131 with the outside of the housing 13.

[0067] The sealed cavity 131 inside the housing 13 is an important structure to prevent the fusion cavity from communicating with the outside through the drive mechanism, resulting in the inability to maintain a vacuum environment in the fusion cavity. Therefore, once the seal of the sealed cavity 131 fails, the rotating mirror drive mechanism 1 also cannot meet the usage requirements.

[0068] Therefore, the fatigue test system for the rotating mirror drive mechanism in this embodiment further includes a leak detector 30. The leak detector 30 is used to connect to the suction joint 132 to detect the sealability of the sealed cavity 131.

[0069] When performing a fatigue test on the rotating mirror drive mechanism 1, every time the rotating mirror 100 rotates a certain number of times, in addition to testing the rotation accuracy of the rotating mirror 100, it is also necessary to test the sealability of the sealed cavity 131 through the leak detector 30. If the seal of the sealed cavity 131 fails, the fatigue life test of the rotating mirror drive mechanism 1 ends.

[0070] As Figures 2-5 shown, in the fatigue test system for the rotating mirror drive mechanism in this embodiment, a first cooling flow channel 133 is provided inside the housing 13. The rotating mirror 100 includes a mirror body 1001 and a cooling plate 1002 fixedly attached to the back of the mirror body 1001. A second cooling flow channel is provided in the cooling plate 1002. The rotating mirror drive mechanism 1 further includes a connecting pipe 14, a coolant supply pipe 15, and a coolant return pipe 16. The connecting pipe 14 connects the housing 13 and the cooling plate 1002. A connecting flow channel is provided inside the connecting pipe 14, and the connecting flow channel communicates the first cooling flow channel 133 with the second cooling flow channel. Both the coolant supply pipe 15 and the coolant return pipe 16 are connected to the housing 13 at one end. A liquid supply flow channel is provided inside the coolant supply pipe 15, and a liquid return flow channel is provided inside the coolant return pipe 16. The first cooling flow channel 133, the second cooling flow channel, the connecting flow channel, the liquid supply flow channel, and the liquid return flow channel form a cooling flow channel group. The first cooling flow channel 133 includes a first sub-flow channel 1331 and a second sub-flow channel 1332. The connecting pipe 14 includes a first sub-connecting pipe 141 and a second sub-connecting pipe 142. The coolant supply pipe 15 is connected to the coolant return pipe 16 through the first sub-flow channel 1331, the first sub-connecting pipe 141, the second cooling flow channel, the second sub-connecting pipe 142, and the second sub-flow channel 1332.

[0071] When the cooling channel group fails to be sealed, the rotating mirror driving mechanism 1 can no longer meet the usage requirements. Therefore, in this embodiment, the leak detector 30 is also used to connect to the coolant supply pipe 15 or the coolant return pipe 16 to detect the sealing performance of the cooling channel group. When the leak detector 30 is connected to the coolant supply pipe 15, the liquid outlet of the coolant return pipe 16 is blocked. When it is connected to the coolant return pipe 16, the liquid inlet of the coolant supply pipe 15 is blocked. When performing the fatigue test on the rotating mirror driving mechanism 1, every time the rotating mirror 100 rotates a certain number of times, it is also necessary to detect the cooling channel group through the leak detector 30. If the cooling channel group fails to be sealed, the fatigue life test of the rotating mirror driving mechanism 1 ends. Specifically, when actually performing the sealing test of the cooling channel group, the leak detector 30 is connected to the coolant supply pipe 15, and the liquid outlet of the coolant return pipe 16 is welded and sealed.

[0072] Optionally, as Figure 1 shown, the rotating mirror driving mechanism fatigue test system in this embodiment further includes a coolant supply device 40. The coolant supply device 40 is used to connect to the coolant supply pipe 15 to supply coolant to the cooling channel group. When performing the fatigue test on the rotating mirror driving mechanism 1, the driving motor 11 drives the rotating mirror 100 to rotate a certain number of times through the transmission assembly 12. During this process, the coolant supply device 40 passes coolant into the cooling channel group through the coolant supply pipe 15 and maintains the pressure. The pressure maintained is 5 MPa. During this process, the liquid outlet of the coolant return pipe 16 is in a welded and sealed state. The main purpose of using the coolant supply device 40 to pass coolant into the coolant supply pipe 15 and maintain a pressure of 5 MPa is to make the pressure situation in the cooling channel group the same as that during the actual use of the rotating mirror driving mechanism when the driving motor 11 drives the rotating mirror 100 to reciprocate, so that the fatigue test process of the rotating mirror driving mechanism is closer to the actual use working condition of the rotating mirror driving mechanism.

[0073] Optionally, the fatigue test system for the rotating mirror driving mechanism in this embodiment further includes a nitrogen supply device, which is used to connect with the coolant supply pipe 15 or the coolant return pipe 16 to blow dry the cooling channel group. Specifically, in this embodiment, when the nitrogen supply device blows dry the cooling channel group, the nitrogen supply device is connected to the coolant supply pipe 15. Before using the leak detector 30 to detect the leak of the cooling channel group, first use the nitrogen supply device to blow dry the residual cooling water in the cooling channel group to avoid interference from the residual cooling water in the cooling channel group during the leak detection process of the leak detector 30 for the cooling channel group. Before using the nitrogen supply device to blow dry the cooling channel group, it is necessary to cut open the liquid outlet of the welded and sealed coolant return pipe 16 first, so that the nitrogen entering the cooling channel group subsequently can be discharged through the coolant return pipe 16. When the coolant supply device 40 is used again to fill the cooling channel group with coolant, the liquid outlet of the coolant return pipe 16 is welded and sealed again.

[0074] As Figures 1-5 shown, the rotating mirror driving mechanism 1 in this embodiment further includes a first mounting seat 17 and a second mounting seat 18. The housing 13 is arranged on the first mounting seat 17. There are multiple first mounting seats 17, and the multiple first mounting seats 17 are arranged at intervals along the length direction of the housing 13.

[0075] As Figures 1-5 shown, the rotating mirror driving mechanism 1 in this embodiment further includes a second mounting seat 18. The transmission assembly 12 in this embodiment includes a reducer 121, an eccentric rod 122, a rotating rod 123, a cross-axis transmission mechanism 124, a worm and worm gear 125, and a pin shaft. The pin shaft is rotatably arranged on the second mounting seat 18, and the rotating mirror 100 is connected to the pin shaft. The eccentric rod 122 is arranged inside the housing 13. The reducer 121 is connected to the housing 13, and the output shaft extends into the housing 13 and is connected to one end of the eccentric rod 122. The other end of the eccentric rod 122 is connected to the rotating rod 123. The end of the rotating rod 123 away from the eccentric rod 122 is exposed outside the housing 13. The worm and worm gear 125 is arranged on the second mounting seat 18. One end of the cross-axis transmission mechanism 124 is connected to the end of the eccentric rod 122 exposed outside the housing 13, and the other end is connected to the input end of the worm and worm gear 125. The output end of the worm and worm gear 125 is connected to the pin shaft. The drive motor 11 drives the pin shaft to rotate through the reducer 121, the eccentric rod 122, the rotating rod 123, the cross-axis transmission mechanism 124, and the worm and worm gear 125. The pin shaft drives the rotating mirror 100 to rotate, and the rotation axis of the rotating mirror 100 is also the axis of the pin shaft. In this embodiment, the transmission ratio between the input end and the output end of the reducer 121 is 20, and the transmission ratio between the input end and the output end of the worm and worm gear 125 is 62. Therefore, the transmission ratio between the drive motor 11 and the pin shaft is 1240. Specifically, the cross-axis transmission mechanism 124 is a cross universal joint.

[0076] As Figures 2-5 shown, the housing 13 in this embodiment includes a cooling sleeve 134 and a fixing sleeve 135. One end of the fixing sleeve 135 is fixedly connected to one end of the cooling sleeve 134, and the connection part is sealed. The eccentric rod 122 is located inside the fixing sleeve 135, the rotating rod 123 is located inside the cooling sleeve 134, and the rotating rod 123 and the eccentric rod 122 are connected by a connecting component 128. The connecting component 128 is rotatably arranged at the connection part of the fixing sleeve 135 and the cooling sleeve 134, and one end is connected to the rotating rod 123 and the other end is connected to the eccentric rod 122.

[0077] As Figure 4 and Figure 5 shown, the transmission component 12 in this embodiment further includes a sealing tube 126. The sealing tube 126 is sleeved outside the eccentric rod 122, and the first end of the sealing tube 126 is hermetically connected to the housing 13, and the second end is hermetically connected to the outer periphery of the eccentric rod 122. Specifically, the first end of the sealing tube 126 is hermetically connected to the end of the fixing sleeve 135 close to the cooling sleeve 134. When the eccentric rod 122 rotates and swings, the second end of the sealing tube 126 will not rotate with the eccentric rod 122, so that the second end of the sealing tube 126 and the eccentric rod 122 can be fixedly connected by a flange structure, ensuring the sealing performance of the connection node between the second end of the sealing tube 126 and the eccentric rod 122. In this embodiment, the sealing tube 126 is a corrugated tube.

[0078] As Figures 4-5 shown, further, the transmission component 12 in this embodiment further includes a magnetic fluid sealing device 127. The magnetic fluid sealing device 127 is arranged at the end of the rotating rod 123 far from the sealing tube 126 and is connected to the housing 13. The rotating rod 123 passes through the magnetic fluid sealing device 127 and is exposed. The part of the rotating rod 123 exposed outside the magnetic fluid sealing device 127 is connected to the end of the cross-axis transmission mechanism 124 far from the rotating mirror 100. The magnetic fluid sealing device 127 is used to seal one end of the rotating rod 123 far from the drive motor 11. The magnetic fluid sealing device 127 is an existing device in the art, and its specific structure and working principle are common knowledge in the art, which will not be elaborated here.

[0079] As Figures 4-5As shown, a magnetic fluid sealing device 127, a cooling sleeve 134, a sealing tube 126, an eccentric rod 122, a connecting assembly 128, and a rotating rod 123 enclose to form a sealing cavity 131. When the suction joint 132 is closed, the sealing cavity 131 is in a sealed state. During the actual use of the rotating mirror driving mechanism 1, one end of the driving motor 11, the speed reducer 121, and the fixed sleeve 135 close to the driving motor 11 is located outside the fusion cavity, and one end of the fixed sleeve 135 close to the cooling sleeve 134 extends into the fusion cavity, and the fixed sleeve 135 is hermetically connected to the cavity wall of the fusion cavity. The existence of the sealing cavity 131 prevents the air outside the fusion cavity from entering the fusion cavity through the inside of the transmission assembly 12. This is also the reason why the sealing performance of the sealing cavity 131 needs to be tested when the rotating mirror driving mechanism fatigue test system provided in this embodiment performs a fatigue test on the rotating mirror driving mechanism 1.

[0080] The rotating mirror 100 has a first design limit position and a second design limit position, and the rotating mirror driving mechanism 1 is used to drive the rotating mirror 100 to rotate between the first design limit position and the second design limit position according to the usage requirements of the rotating mirror 100.

[0081] As Figure 6 and Figure 7 As shown, this embodiment also provides a method for testing the fatigue life of a rotating mirror driving mechanism. The fatigue life test of the rotating mirror driving mechanism for a thermonuclear fusion device is performed using the above-mentioned rotating mirror driving mechanism fatigue test system, including:

[0082] Perform a round of fatigue test on the rotating mirror driving mechanism and make a judgment on the fatigue test of the rotating mirror driving mechanism in this round;

[0083] A round of fatigue test on the rotating mirror driving mechanism includes:

[0084] Control the driving motor 11 to drive the rotating mirror 100 to reciprocate between the first design limit position and the second design limit position multiple times;

[0085] Select multiple driving accuracy monitoring positions within the rotation range of the rotating mirror 100. The multiple driving accuracy monitoring positions include the first design limit position and the second design limit position, and also include multiple positions between the first design limit position and the second design limit position;

[0086] After the driving motor 11 drives the rotating mirror 100 to reciprocate between the first design limit position and the second design limit position multiple times, control the driving motor 11 to drive the rotating mirror 100 to rotate to each driving accuracy monitoring position in turn, and respectively monitor the driving accuracy deviation of the rotating mirror 100 at each driving accuracy monitoring position. The maximum value of the absolute value of the driving accuracy deviation of the rotating mirror 100 at each driving accuracy monitoring position is the maximum driving accuracy deviation of the fatigue test of the rotating mirror driving mechanism in this round;

[0087] The fatigue test determination of the current round of rotating mirror drive mechanism includes:

[0088] If the maximum value of the drive precision deviation in the fatigue test of the current round of rotating mirror drive mechanism is not greater than the preset drive precision deviation value, then proceed to the next round of fatigue test of the rotating mirror drive mechanism;

[0089] If the maximum value of the drive precision deviation in the fatigue test of the current round of rotating mirror drive mechanism is greater than the preset drive precision deviation value, then the fatigue life test of the rotating mirror drive mechanism terminates;

[0090] If in the fatigue test of the current round of rotating mirror drive mechanism, when controlling the drive motor 11 to drive the rotating mirror 100 to rotate to each drive precision monitoring position in turn, the absolute value of the difference between the actual angular displacement of the drive motor 11 and the theoretical angular displacement of the drive motor 11 corresponding to this drive precision monitoring position is greater than the preset angular displacement deviation value of the drive motor, then the fatigue life test of the rotating mirror drive mechanism terminates;

[0091] Repeat the above process until the fatigue life test of the rotating mirror drive mechanism terminates;

[0092] If the fatigue test of the rotating mirror drive mechanism terminates after the m-th round of fatigue test of the rotating mirror drive mechanism, then the fatigue life of the rotating mirror drive mechanism 1 is equal to the sum of the reciprocating rotation times of the rotating mirror 100 from the first round of fatigue test of the rotating mirror drive mechanism to the (m - 1)-th round of fatigue test of the rotating mirror drive mechanism, where m is a positive integer greater than 1.

[0093] The drive precision deviation of the rotating mirror 100 at the drive precision monitoring position is also that, after the drive motor 11 receives the control command to drive the rotating mirror 100 to rotate to a certain drive precision monitoring position and drives the rotating mirror 100 to complete the rotation, the difference between the actual position of the rotating mirror 100 monitored by the laser tracker 10 and the theoretical position of the drive precision monitoring position. The actual angular displacement of the drive motor 11 is also the angular displacement of the rotating shaft of the drive motor 11 detected by the encoder.

[0094] The absolute value of the difference between the theoretical angular displacements of the drive motor 11 being greater than the preset angular displacement deviation value of the drive motor indicates that the drive precision of the drive motor 11 itself does not meet the requirements. When the absolute value of the difference between the theoretical angular displacements of the drive motor 11 is greater than the preset angular displacement deviation value of the drive motor, terminating the fatigue life test of the rotating mirror drive mechanism can further improve the accuracy of the fatigue life test of the rotating mirror drive mechanism.

[0095] Optionally, controlling the drive motor 11 to drive the rotating mirror 100 to rotate to each drive precision monitoring position in turn and respectively monitoring the drive precision deviation of the rotating mirror 100 at each drive precision monitoring position includes:

[0096] Send control signals to the drive motor 11 in sequence to drive the rotating mirror 100 to rotate to each drive accuracy monitoring position;

[0097] After each rotation of the drive motor 11 is completed, the actual angular displacement of the drive motor 11 is monitored by an encoder, and the actual position of the rotating mirror 100 is monitored by a laser tracker 10. If the absolute value of the difference between the actual angular displacement of the drive motor 11 and the theoretical angular displacement of the drive motor 11 corresponding to this drive accuracy monitoring position is not greater than the preset angular displacement deviation value of the drive motor, then the difference between the actual position of the rotating mirror 100 and this drive accuracy monitoring position is the drive accuracy deviation of the drive accuracy monitoring position.

[0098] In this embodiment, except for the first design limit position and the second design limit position of the rotating mirror 100, between the first design limit position and the second design limit position of the rotating mirror 100, a drive accuracy monitoring position is taken every 0.3°. If the included angle between the first design limit position and the second design limit position of the rotating mirror 100 is 30°, then there are 101 drive accuracy monitoring positions in total. That is, each round of fatigue test of the rotating mirror drive mechanism will obtain 101 drive accuracy deviations, and the maximum value among the absolute values of these 101 drive accuracy deviations is the maximum drive accuracy deviation of this round of fatigue test of the rotating mirror drive mechanism.

[0099] Optionally, in the first round and the second round of fatigue tests of the rotating mirror drive mechanism, the number of times the drive motor 11 drives the rotating mirror 100 to rotate back and forth is equal to the preset number of times. In this embodiment, the preset number of times is 2000 times;

[0100] In the nth round of fatigue test of the rotating mirror drive mechanism, if the maximum drive accuracy deviation of the (n - 1)th round of fatigue test of the rotating mirror drive mechanism is greater than the maximum drive accuracy deviation of the (n - 2)th round of fatigue test of the rotating mirror drive mechanism, then in the nth round of fatigue test of the rotating mirror drive mechanism, the number of times the drive motor 11 drives the rotating mirror 100 to rotate back and forth is less than the number of times the drive motor 11 drives the rotating mirror 100 to rotate back and forth in the (n - 1)th round of fatigue test of the rotating mirror drive mechanism; if the maximum drive accuracy deviation of the (n - 1)th round of fatigue test of the rotating mirror drive mechanism is not greater than the maximum drive accuracy deviation of the (n - 2)th round of fatigue test of the rotating mirror drive mechanism, then in the nth round of fatigue test of the rotating mirror drive mechanism, the number of times the drive motor 11 drives the rotating mirror 100 to rotate back and forth is equal to the number of times the drive motor 11 drives the rotating mirror 100 to rotate back and forth in the (n - 1)th round of fatigue test of the rotating mirror drive mechanism, where n is a positive integer greater than 2.

[0101] Optionally, during the process that the driving motor 11 drives the rotating mirror 100 to reciprocate between the first design limit position and the second design limit position for multiple times, the liquid outlet of the coolant return pipe 16 is in a welded and sealed state, and the coolant supply device 40 passes coolant into the cooling channel group through the coolant supply pipe 15 and maintains a preset pressure. In this embodiment, the preset pressure is 5 MPa. That is to say, during the process that the driving motor 11 drives the rotating mirror 100 to reciprocate between the first design limit position and the second design limit position, the coolant supply device 40 passes coolant into the cooling channel group and maintains the pressure, and the pressure maintaining value is 5 MPa.

[0102] Optionally, a round of fatigue test of the rotating mirror driving mechanism further includes:

[0103] After the driving motor 11 drives the rotating mirror 100 to reciprocate between the first design limit position and the second design limit position for multiple times, the leak detector 30 is used to detect leaks in the sealed cavity 131;

[0104] The judgment of this round of fatigue test of the rotating mirror driving mechanism further includes:

[0105] If the leak detection of the sealed cavity 131 fails, the fatigue life test of the rotating mirror driving mechanism is terminated. Specifically, the specific standard for whether the leak detection of the sealed cavity 131 passes is specifically set according to needs.

[0106] Optionally, a round of fatigue test of the rotating mirror driving mechanism further includes:

[0107] After the driving motor 11 drives the rotating mirror 100 to reciprocate between the first design limit position and the second design limit position for multiple times, the liquid outlet of the coolant return pipe 16 is cut open, and the nitrogen supply device is used to dry the cooling channel group;

[0108] Then, the liquid outlet of the coolant return pipe 16 is welded and sealed, and the leak detector 30 is connected to the coolant supply pipe 15 to detect leaks in the cooling channel group;

[0109] The judgment of this round of fatigue test of the rotating mirror driving mechanism further includes:

[0110] If the leak detection of the cooling channel group fails, the fatigue life test of the rotating mirror driving mechanism is terminated. Specifically, the specific standard for whether the leak detection of the cooling channel group passes is specifically set according to needs.

[0111] It should be noted that when the rotating mirror 100 rotates once within the rotation range in this embodiment, that is, the rotating mirror 100 rotates from the first design limit position to the second design limit position, or rotates from the second design limit position to the first design limit position. When it is said to drive the rotating mirror 100 to rotate multiple times or rotate a certain number of times in this embodiment, that is, to drive the rotating mirror 100 to rotate multiple times or rotate a certain number of times within the rotation range.

[0112] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A fatigue testing system for a rotating mirror driving mechanism, characterized in that: Used for fatigue testing of a rotating mirror driving mechanism for a thermonuclear fusion device, the rotating mirror driving mechanism comprising a driving motor and a transmission assembly, the driving motor can drive the rotating mirror to rotate through the transmission assembly, and the rotating mirror driving mechanism fatigue testing system comprises a laser tracker, a target ball and an encoder; The target ball is arranged on the rotating mirror; The laser tracker is used to cooperate with the target ball to monitor the position of the rotating mirror; The encoder is arranged on the driving motor and is used for detecting the angular displacement of the rotating shaft of the driving motor.

2. The fatigue testing system for the rotating mirror driving mechanism according to claim 1, characterized in that: There are a plurality of target balls, and the plurality of target balls are arranged on the rotating mirror at intervals.

3. The fatigue testing system for the rotating mirror driving mechanism according to claim 2, characterized in that: The rotating mirror is a quadrilateral, and each of the four vertex areas of the rotating mirror is provided with a target ball.

4. The fatigue testing system for the rotating mirror driving mechanism according to claim 1, characterized in that: The rotating mirror driving mechanism further comprises a housing, wherein the housing has a sealed cavity, wherein the transmission assembly is partially located in the sealed cavity, and both ends of the transmission assembly in the length direction are exposed to the housing, and a suction joint is provided on the housing, wherein the suction joint communicates the sealed cavity with the outside of the housing; The rotating mirror driving mechanism fatigue testing system further comprises a leak detector, which is used to be connected to the suction joint to detect the sealed cavity.

5. The fatigue testing system for the rotating mirror driving mechanism according to claim 4, characterized in that: A first cooling channel is provided in the shell; The rotating mirror comprises a mirror body and a cooling plate fixedly attached to the back of the mirror body, wherein a second cooling channel is provided in the cooling plate; The rotating mirror driving mechanism further includes a connecting pipe, a cooling liquid supply pipe and a cooling liquid return pipe, wherein the connecting pipe connects the housing and the cooling plate, a connecting flow channel is arranged in the connecting pipe, and the connecting flow channel connects the first cooling flow channel and the second cooling flow channel, the cooling liquid supply pipe and the cooling liquid return pipe are both connected to the housing at one end, a liquid supply flow channel is arranged in the cooling liquid supply pipe, and a liquid return flow channel is arranged in the cooling liquid return pipe; The first cooling channel, the second cooling channel, the connecting channel, the liquid supply channel and the liquid return channel form a cooling channel group.

6. The fatigue testing system for the rotating mirror driving mechanism according to claim 5, characterized in that: The leak detector is also used to be connected to a coolant supply pipe or a coolant return pipe to detect the cooling channel group.

7. The fatigue testing system for the rotating mirror driving mechanism according to claim 6, characterized in that: It also includes a cooling liquid supply device, which is used to be connected to the cooling liquid supply pipe to supply cooling liquid to the cooling channel group.

8. The fatigue testing system for the rotating mirror driving mechanism according to claim 7, characterized in that: It also includes a nitrogen supply device, which is used to be connected to a coolant supply pipe or a coolant return pipe to dry the cooling channel group.

9. A method for testing fatigue life of a rotating mirror driving mechanism, characterized in that: The fatigue life test of a rotating mirror drive mechanism for a thermonuclear fusion device is performed using the rotating mirror drive mechanism fatigue test system according to any one of claims 1 to 8, comprising: Conduct a round of fatigue test on the rotating mirror drive mechanism, and make a judgment on the fatigue test on the rotating mirror drive mechanism in this round; The fatigue test of the rotating mirror driving mechanism includes: Controlling the driving motor to drive the rotating mirror to reciprocate multiple times between a first design limit position and a second design limit position; Selecting a plurality of driving accuracy monitoring positions within the rotation range of the rotating mirror, wherein the plurality of driving accuracy monitoring positions include a first design limit position and a second design limit position; After the driving motor drives the rotating mirror to rotate back and forth between the first design limit position and the second design limit position for multiple times, the driving motor is controlled to drive the rotating mirror to rotate to each driving accuracy monitoring position in sequence, and the driving accuracy deviation of the rotating mirror at each driving accuracy monitoring position is monitored respectively, and the maximum value of the absolute value of the driving accuracy deviation of the rotating mirror at each driving accuracy monitoring position is the maximum value of the driving accuracy deviation of the driving mechanism of the rotating mirror in this round of fatigue test; The fatigue test judgment of the rotating mirror driving mechanism includes: If the maximum value of the driving accuracy deviation in the current round of fatigue test of the rotating mirror driving mechanism is not greater than the preset driving accuracy deviation value, the next round of fatigue test of the rotating mirror driving mechanism is performed; If the maximum driving accuracy deviation in the fatigue test of the rotating mirror driving mechanism in this round is greater than the preset driving accuracy deviation value, the fatigue life test of the rotating mirror driving mechanism is terminated; If, in this round of fatigue test of the rotating mirror driving mechanism, when the driving motor is controlled to drive the rotating mirror to rotate to each driving precision monitoring position in sequence, the absolute value of the difference between the actual angular displacement of the driving motor and the theoretical angular displacement of the driving motor corresponding to the driving precision monitoring position is greater than the preset angular displacement deviation value of the driving motor, the fatigue life test of the rotating mirror driving mechanism is terminated; Repeat the above process until the fatigue life test of the rotating mirror drive mechanism is terminated; If the fatigue test of the rotating mirror driving mechanism is terminated after the mth round of the rotating mirror driving mechanism fatigue test, the fatigue life of the rotating mirror driving mechanism is equal to the sum of the number of reciprocating rotations of the rotating mirror in the first round of the rotating mirror driving mechanism fatigue test to the m-1th round of the rotating mirror driving mechanism fatigue test, where m is a positive integer greater than 1.

10. The fatigue testing method of the rotating mirror driving mechanism according to claim 9, characterized in that: In the first and second rounds of fatigue tests on the rotating mirror drive mechanism, the driving motor drives the rotating mirror to reciprocate a number of times equal to the preset number; In the nth round of fatigue test of the rotating mirror drive mechanism, if the maximum value of the driving accuracy deviation of the fatigue test of the rotating mirror drive mechanism in the n-1th round is greater than the maximum value of the driving accuracy deviation of the fatigue test of the rotating mirror drive mechanism in the n-2th round, then the number of times the driving motor drives the rotating mirror to reciprocate in the fatigue test of the rotating mirror drive mechanism in the nth round is less than the number of times the driving motor drives the rotating mirror to reciprocate in the fatigue test of the rotating mirror drive mechanism in the n-1th round; if the maximum value of the driving accuracy deviation of the fatigue test of the rotating mirror drive mechanism in the n-1th round is not greater than the maximum value of the driving accuracy deviation of the fatigue test of the rotating mirror drive mechanism in the n-2th round, then the number of times the driving motor drives the rotating mirror to reciprocate in the fatigue test of the rotating mirror drive mechanism in the nth round is equal to the number of times the driving motor drives the rotating mirror to reciprocate in the fatigue test of the n-1th round, and n is a positive integer greater than 2.

Images