Dustproof turntable mechanism and single-axis modulation inertial navigation equipment

Abstract

The utility model discloses a dustproof rotary table mechanism and single -shaft modulation inertial navigation equipment, dustproof rotary table mechanism includes support casing, rotary drive part and first mounting disc, and the middle part of support casing upper end is provided with first opening, and rotary drive part has drive shaft, and rotary drive part is installed in support casing, and the upper end of drive shaft is outstretched to support casing outside through first opening, and first mounting disc is horizontally arranged and is coaxially fixedly connected with the upper end of drive shaft, and the upper end of support casing is concave and is provided with the annular sealing groove, and sealing groove is coaxially distributed with first mounting disc, and first opening is located in the ring of sealing groove, and the lower end of first mounting disc is coaxially provided with the annular skirt, and skirt is aligned with sealing groove and extends to the sealing groove in. Through the lower end of first mounting disc convex skirt, and make skirt extend to sealing groove, like this can seal the processing to first opening, make dust unable to enter to support casing.

Description

Technical Field

[0001] This utility model belongs to the field of inertial navigation technology, and in particular relates to a dustproof turntable mechanism and a single-axis modulation inertial navigation device. Background Technology

[0002] Existing high-precision inertial navigation devices mainly include strapdown inertial navigation, single-axis modulation inertial navigation, dual-axis modulation inertial navigation, and tri-axis modulation inertial navigation. For single-axis modulation inertial navigation devices, a turntable mechanism is required to drive the rotation of the inertial measurement unit (IMU). The IMU contains gyroscopes and accelerometers. Currently, when existing single-axis modulation inertial navigation devices are placed in the field, it is difficult to simultaneously achieve good heat dissipation (the IMU is sensitive to heat) and dust protection (the turntable mechanism is sensitive to dust). For the turntable mechanism, dust accumulation will affect the heat dissipation performance and rotation accuracy of the turntable mechanism. The structure disclosed in document CN202126265U, "A Dynamic Rotation Modulation Gyroscope North Finder", is a fully enclosed structure, that is, the gyroscope and the axis system are both inside the base (equivalent to placing the turntable mechanism and the IMU in a sealed cover). It has a good dust protection effect, but it cannot simultaneously achieve good heat dissipation. Utility Model Content

[0003] To solve the above-mentioned technical problems, one of the objectives of this utility model is to provide a dustproof turntable mechanism with better dustproof properties.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: A dustproof turntable mechanism includes a supporting housing, a rotating drive component, and a first mounting plate. A first opening is provided in the middle of the upper end of the supporting housing. The rotating drive component has a drive shaft and is installed inside the supporting housing. The upper end of the drive shaft extends out of the supporting housing through the first opening. The first mounting plate is horizontally positioned and coaxially fixedly connected to the upper end of the drive shaft. A circular sealing groove is recessed in the upper end of the supporting housing. The sealing groove is coaxially distributed with the first mounting plate. The first opening is located within the ring of the sealing groove. A circular skirt is coaxially protruding from the lower end of the first mounting plate, and the skirt is aligned with the sealing groove. The lower end of the skirt extends into the sealing groove and makes sealing contact with the side wall and / or bottom wall of the sealing groove.

[0005] The beneficial effect of the above technical solution is that by providing a skirt at the lower end of the first mounting plate and extending the skirt into the sealing groove, the skirt rotates synchronously with the first mounting plate when the rotating drive unit drives the first mounting plate to rotate, and always extends into the sealing groove. The skirt rotates relative to the sealing groove, but maintains a sealed contact state. This is equivalent to sealing the first opening, so that dust cannot enter the support housing.

[0006] The above technical solution also includes a cylindrical support frame, which is fixedly installed at the upper inner end of the support housing, and the inner hole of the support frame is aligned with the first opening. The rotation drive component is embedded in the support frame, and both the upper and lower ends of the support frame are rotatably connected to the drive shaft through bearings.

[0007] The beneficial effects of the above technical solution are as follows: the rotating drive component can be installed in a suspended manner on the upper inner end of the support housing through the support frame, and the support frame and the rotating drive component can seal the first opening at the upper inner end of the support housing, which is equivalent to playing a secondary dustproof function. The bearing can improve the stability of the rotating drive component installed in the support frame.

[0008] The support frame described in the above technical solution includes an upper cover plate and a lower cylinder. The upper cover plate is an annular plate, and the lower end of the lower cylinder has a flanged ring. The upper cover plate is coaxially installed on the upper end of the lower cylinder and together form an annular groove-shaped mounting groove. The rotating drive component is embedded in the mounting groove. The upper cover plate and / or the lower cylinder are connected to the support housing. The upper cover plate and the flanged ring are rotatably connected to the drive shaft through the bearings.

[0009] The beneficial effects of the above technical solution are: it makes the rotation drive component more stable when installed in the support frame, especially since the upper cover plate and the flange ring can be combined to axially limit the rotation drive component.

[0010] The above technical solution also includes an angle measuring sensor disposed in the support housing. The angle measuring sensor is located below the support frame. The angle measuring sensor includes a sensor rotor and a sensor stator. The sensor rotor is coaxially and fixedly connected to the lower end of the drive shaft, and the sensor stator is coaxially and fixedly connected to the lower end of the support frame.

[0011] The beneficial effect of the above technical solution is that the rotation parameters of the drive shaft can be accurately monitored through the angle sensor.

[0012] The rotation drive component described in the above technical solution includes a hollow cup torque motor and a hollow shaft. The rotor of the hollow cup torque motor is annular, and the hollow shaft is coaxially sleeved inside the motor rotor. The hollow shaft constitutes the drive shaft of the rotation drive component.

[0013] The advantages of the above technical solution are: its structure is simple, and the inner hole of the hollow shaft can serve as a channel for the conductive wire and an installation space for the electronic slip ring.

[0014] The second objective of this invention is to provide a single-axis modulation inertial navigation device with a simple structure and good dustproof and heat dissipation performance.

[0015] To achieve the above objectives, another technical solution of this utility model is as follows: A single-axis modulated inertial navigation device includes an inertial measurement mechanism, an electronic slip ring, a control module, and a dustproof turntable mechanism as described above. The lower end of the inertial measurement mechanism has a horizontally arranged second mounting plate, which is coaxially connected to the first mounting plate. The electronic slip ring is disposed inside the hollow shaft and has a slip ring rotor and a slip ring stator. The slip ring rotor is coaxially and fixedly connected to the hollow shaft, and the slip ring stator is fixedly disposed relative to the support housing. The conductive wire of the inertial measurement mechanism is led through the hollow shaft to be electrically connected to the slip ring rotor. The slip ring stator and the dustproof turntable mechanism are both electrically connected to the control module.

[0016] The beneficial effects of the above technical solution are as follows: the inertial measurement mechanism can be directly installed in the middle of the upper part of the first mounting plate. At this time, the inner hole of the hollow shaft is blocked by the inertial measurement mechanism, and dust cannot enter the support housing through the hollow shaft. In addition, the inner hole of the hollow shaft provides installation space for the electronic slip ring. The inertial measurement mechanism is electrically connected to the control module through the electronic slip ring. This way, when the rotation drive drives the inertial measurement mechanism to rotate, there is no need to worry about the conductive wire of the inertial measurement mechanism getting tangled.

[0017] The control module described in the above technical solution is located inside the support housing.

[0018] The beneficial effect of the above technical solution is that it allows the control module to be in a low-dust environment inside the support housing, which is conducive to improving the operating performance of the control module.

[0019] The above technical solution also includes a housing and a cooling fan. A second opening is provided in the middle of the lower end of the housing. The inertial measurement mechanism is located inside the housing, and the upper end of the supporting housing extends into the housing through the second opening. The edge of the second opening extends to the outer side wall of the supporting housing. An air inlet and an air outlet are provided on the housing. The air outlet of the cooling fan is aligned with the air inlet. The cooling fan is used to blow air into the housing. The cooling fan is electrically connected to the control module.

[0020] The beneficial effects of the above technical solution are as follows: by setting up an outer shell, the inertial measurement mechanism can be protected without affecting its normal rotation, and by setting up a cooling fan, the heat dissipation performance of the inertial measurement mechanism can be improved.

[0021] In the above technical solution, the air inlet is located at the lower edge of the outer casing, and the cooling fan is located on the outer side wall of the supporting housing and below the outer casing.

[0022] The beneficial effect of the above technical solution is that the cooling fan can be directly installed on the side wall of the supporting housing, thus not occupying the space inside the housing.

[0023] The above technical solution includes multiple cooling fans and air inlets.

[0024] The beneficial effect of the above technical solution is that it can further improve the heat dissipation performance of the inertial measurement mechanism. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the dustproof turntable mechanism described in Embodiment 1 of this utility model; Figure 2 This is an assembly diagram of the support frame, rotation drive component, and angle measuring sensor described in Embodiment 1 of this utility model; Figure 3 This is another cross-sectional view of the dustproof turntable mechanism described in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the structure of the support shell described in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of the single-axis modulation inertial navigation device described in Embodiment 2 of this utility model; Figure 6 This is a cross-sectional view of the rotation drive component described in Embodiment 2 of this utility model; Figure 7 This is a schematic diagram of the single-axis modulation inertial navigation device described in Embodiment 3 of this utility model; Figure 8 This is a schematic diagram showing the connection between the supporting shell and the outer shell in Embodiment 3 of this utility model.

[0026] In the diagram: 1. Dustproof turntable mechanism; 11. Support housing; 111. First opening; 112. Sealing groove; 113. Fourth connecting hole; 114. Channel-shaped housing; 115. Base plate; 12. Rotation drive component; 121. Empty cup torque motor; 1211. Motor rotor; 1212. Motor stator; 12121. First threaded hole; 122. Hollow shaft; 13. First mounting plate; 131. Skirt; 14. Support frame; 141. Upper cover plate; 1411. Third connecting hole; 142. Lower cylinder; 1421. Flanged ring; 142 11. First connecting hole; 1422. Second threaded hole; 143. Mounting groove; 15. Bearing; 16. Angle sensor; 161. Sensor rotor; 162. Sensor stator; 1621. Second connecting hole; 17. First bolt; 18. Second bolt; 19. Fastening plate; 2. Inertial measurement mechanism; 21. Second mounting plate; 3. Electronic slip ring; 31. Slip ring rotor; 32. Slip ring stator; 4. Control module; 5. Housing; 51. Second opening; 511. Connecting ring; 52. Air inlet; 53. Air outlet; 6. Cooling fan. Detailed Implementation

[0027] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0029] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0030] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0031] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0032] Example 1 like Figures 1-3 As shown, this embodiment provides a dustproof turntable mechanism, including a support housing 11, a rotation drive component 12, and a first mounting plate 13. The support housing 11 has a first opening 111 in the middle of its upper end. The rotation drive component 12 has a drive shaft and is installed inside the support housing 11. The upper end of the drive shaft extends out of the support housing 11 through the first opening 111. The first mounting plate 13 is horizontally arranged and coaxially fixedly connected to the upper end of the drive shaft. The upper end of the support housing 11 has a recessed annular sealing groove 112. The sealing groove 112 is coaxially distributed with the first mounting plate 13. The first opening 111 is located inside the ring of the sealing groove 112. The lower end of the first mounting plate 13 has a coaxially protruding annular skirt 131, which is aligned with the sealing groove 112. The lower end of the skirt 131 extends into the sealing groove 112 and makes sealing contact with the side wall and / or bottom wall of the sealing groove 112. By providing a protruding skirt at the lower end of the first mounting plate and extending the skirt into the sealing groove, the skirt rotates synchronously with the first mounting plate when the rotating drive unit drives the first mounting plate to rotate, and always extends into the sealing groove (the skirt and the sealing groove rotate relative to each other, but maintain a sealed contact). This is equivalent to sealing the first opening, preventing dust from entering the support housing.

[0033] Preferably, the lower end of the skirt edge is in sealing contact with the bottom wall of the sealing groove.

[0034] In this embodiment, the skirt can be an elastic and wear-resistant rubber part. In this case, the skirt can be slightly compressed so that its lower end can directly abut against the bottom of the sealing groove for sealing.

[0035] In this embodiment, the first installation disk can be made of plastic (such as PVC) or metal (such as stainless steel or aluminum alloy).

[0036] See details Figure 1 As shown, in this embodiment, the skirt can also be integrally formed with the first mounting plate, and the two are made of the same material. Since the skirt and the sealing groove are coaxially distributed, and the inner and outer walls of the skirt maintain a certain gap with the corresponding side of the sealing groove, the frictional resistance between the skirt and the sealing groove is reduced. The lower end of the skirt extends to contact the bottom wall of the sealing groove. In order to further reduce the frictional resistance between the two, a small amount of lubricant (such as industrial grease with a certain viscosity, or silicone-based grease) can be injected into the sealing groove. In addition to lubrication, the lubricant can also improve the sealing effect.

[0037] Preferred, such as Figures 1-3 As shown, the rotation drive component 12 in the above technical solution includes a hollow cup torque motor 121 and a hollow shaft 122. The hollow cup torque motor 121 has a motor stator 1212 and a motor rotor 1211. The motor rotor 1211 is located in the middle of the motor stator 1212 and is annular. The hollow shaft 122 is coaxially sleeved inside the motor rotor 1211, and the hollow shaft 122 constitutes the drive shaft of the rotation drive component 12. Its structure is simple, and the inner hole of the hollow shaft can serve as a wire-passing channel for conductive wires and an installation space for an electronic slip ring (in this case, a wire-passing hole communicating with the inside of the hollow shaft needs to be reserved in the middle of the first mounting plate).

[0038] like Figure 3 As shown, in order to stably install the rotating drive component on the upper inner end of the support housing, a cylindrical support frame 14 can be added in this embodiment. The support frame 14 is fixedly installed on the upper inner end of the support housing 11, and the inner hole of the support frame 14 is aligned with the first opening 111. The rotating drive component 12 is embedded in the support frame 14, and both the upper and lower ends of the support frame 14 are rotatably connected to the drive shaft through bearings 15. In this way, the rotating drive component can be installed in a suspended manner on the upper inner end of the support housing through the support frame, and the support frame and the rotating drive component can seal the first opening on the upper inner end of the support housing, which is equivalent to providing a secondary dustproof function. The bearings can improve the stability of the rotating drive component installed in the support frame.

[0039] Specifically, such as Figure 3As shown, the support frame 14 in the above technical solution includes an upper cover plate 141 and a lower cylinder 142. The upper cover plate 141 is an annular plate, and the lower end of the lower cylinder 142 has a flanged ring 1421. The upper cover plate 141 is coaxially mounted on the upper end of the lower cylinder 142 and together form an annular groove 143. The rotating drive component 12 is embedded in the mounting groove 143. The upper cover plate 141 and / or the lower cylinder 142 are connected to the support housing 11. The upper cover plate 141 and the flanged ring 1421 are rotatably connected to the drive shaft through the bearing 15. This makes the stability of the rotating drive component installed in the support frame better, especially since the upper cover plate 141 and the flanged ring 1421 can be combined to axially limit the rotating drive component.

[0040] like Figure 3 As shown, in order to accurately detect the rotation parameters of the rotating drive component 12, an angle sensor 16 can be added inside the support housing 11 in this embodiment. The angle sensor 16 is located below the support frame 14. The angle sensor 16 includes a sensor rotor 161 and a sensor stator 162. The sensor rotor 161 is coaxially and fixedly connected to the lower end of the drive shaft, and the sensor stator 162 is coaxially and fixedly connected to the lower end of the support frame 14. In this way, the rotation parameters (speed, angle, and direction of rotation, etc.) of the drive shaft can be accurately monitored by the angle sensor. In this embodiment, both the sensor rotor and the sensor stator are annular, and the sensor rotor is located inside the sensor stator.

[0041] like Figure 3 As shown, the empty cup torque motor 121 is located inside the lower cylinder 142, and the angle sensor 16 is located at the lower end of the lower cylinder 142. Since the angle sensor 16 is sensitive to dust, it is placed at the lower end of the support frame 14, which makes it located away from the first opening 111, thereby reducing the possibility of it coming into contact with external dust.

[0042] like Figure 3As shown, in this embodiment, the lower end of the motor stator 1212 has a plurality of first threaded holes 12121 (which may be blind holes) spaced apart along the circumference. The flange ring 1421 has a plurality of first connecting holes 14211 spaced apart along the circumference. The sensor stator 162 has a plurality of second connecting holes 1621 spaced apart along the circumference. The plurality of second connecting holes 1621, the plurality of first connecting holes 14211, and the plurality of first threaded holes 12121 correspond one-to-one and are aligned with each other. A first bolt 17 is inserted into the aligned first connecting holes 14211, second connecting holes 1621, and first threaded holes 12121 to thread them into the first threaded holes 12121. This allows the motor stator 1212 and the sensor stator 162 to be pre-assembled onto the lower cylinder 142. This enables the connection between the empty cup torque motor 121 and the lower cylinder 142, and also enables the connection between the sensor stator 162 and the lower cylinder 142.

[0043] The sensor rotor 162 can be fastened to the lower end of the hollow shaft 122 by screws, or it can be coaxially and interference-fitted onto the lower end of the hollow shaft 122 (details will not be elaborated here).

[0044] like Figure 3 As shown, the upper end of the lower cylinder 142 is provided with a plurality of second threaded holes 1422 (which may be blind holes) spaced apart in the circumferential direction. The upper cover plate 141 is provided with a plurality of third connecting holes 1411 spaced apart in the circumferential direction. The upper end of the support housing 11 is provided with a plurality of fourth connecting holes 113 (which may be countersunk holes with the thicker end facing upwards) spaced apart in the circumferential direction. The plurality of fourth connecting holes 113, the plurality of third connecting holes 1411 and the plurality of second threaded holes 1422 correspond one to one and are aligned with each other. A second bolt 18 is inserted into the aligned fourth connecting holes 113, third connecting holes 1411 and second threaded holes 1422 to be threadedly connected to the second threaded hole 1422. In this way, the lower cylinder 142, the upper cover plate 141 and the support housing 11 can be assembled, so as to realize the connection between the lower cylinder of the rotation drive component and the upper cover plate, and at the same time realize the connection between the support frame and the support housing. Since the fourth connecting hole 113 is a countersunk hole, the head of the second bolt 18 can be inserted into the thicker end of the fourth connecting hole 113, which makes it more aesthetically pleasing. The second bolt 18 can be an internal hex bolt.

[0045] like Figure 4As shown, the bottom plate 115 of the supporting housing 11 in this embodiment is detachable. Specifically, the supporting housing 11 in this embodiment may include a grooved shell 114 and a bottom plate 115. The groove of the grooved shell 114 faces downward, and the bottom plate 115 is installed at the bottom of the grooved shell 114 by screws to seal and cover the lower end of the grooved shell 114. The first opening 111, the sealing groove 112, and the fourth connecting hole 113 are provided at the top of the grooved shell 114.

[0046] Example 2 like Figure 5 As shown, this embodiment provides a single-axis modulated inertial navigation device, including an inertial measurement unit 2, an electronic slip ring 3, a control module 4, and a dustproof turntable mechanism 1 as described in Embodiment 1. The lower end of the inertial measurement unit 2 has a horizontally arranged second mounting plate 21, which is coaxially connected to the first mounting plate 13. The electronic slip ring 3 is disposed inside the hollow shaft 122 and has a slip ring rotor 31 and a slip ring stator 32. The slip ring rotor 31 is coaxially and fixedly connected to the hollow shaft 122, and the slip ring stator 32 is fixedly disposed relative to the support housing 11. The conductive wire of the inertial measurement unit 2 is led through the hollow shaft 122 to be electrically connected to the slip ring rotor 31. The slip ring stator 32 and the dustproof turntable mechanism 1 are both electrically connected to the control module 4. In this way, the inertial measurement unit 2 can be directly installed in the middle of the upper part of the first mounting plate. At this time, the inner hole of the hollow shaft is blocked by the inertial measurement unit, and dust cannot enter the support housing through the hollow shaft. In addition, the inner hole of the hollow shaft provides installation space for the electronic slip ring. The inertial measurement unit is electrically connected to the control module through the electronic slip ring. This way, when the rotation drive drives the inertial measurement unit to rotate, there is no need to worry about the conductive wire of the inertial measurement unit getting tangled.

[0047] In this embodiment, the rotation drive (empty cup torque motor) and the angle measuring sensor of the dustproof turntable mechanism 1 are both electrically connected to the control module.

[0048] The control module described in this embodiment can be a DSP microprocessor (model TMS320F6713), but it is not limited to this.

[0049] The inertial measurement mechanism 2 described in this embodiment is an existing product, and its structure is similar to that disclosed in document CN219495250U, "An Inertial Measurement Mechanism".

[0050] In this embodiment, the slip ring rotor is annular, while the slip ring stator is cylindrical. The slip ring rotor is located outside the slip ring stator, and the slip ring rotor can be coaxially and interference-fitted onto the lower inner end of the hollow shaft.

[0051] like Figure 6 As shown, the dustproof turntable mechanism 1 in this embodiment may further include a fastening plate 19 (groove-shaped with the groove facing upwards). The fastening plate is located below the support frame, and its groove is fastened to the lower end of the support frame, that is, the lower end of the support frame is inserted into the groove of the fastening plate (the groove of the fastening plate can also be fastened to the lower end of the support frame by multiple circumferentially spaced screws). The angle measuring sensor is located in the groove of the fastening plate 19, and the lower end of the slip ring stator passes through the fastening plate (the slip ring stator can be interference-fitted through the middle of the fastening plate, as long as it can restrict the rotation of the slip ring stator relative to the fastening plate). By adding the fastening plate, the angle measuring sensor can also be sealed, which is equivalent to wrapping the angle measuring sensor between the lower cylinder and the fastening plate, thus further improving the dustproof effect of the angle measuring sensor.

[0052] Of course, the lower end of the slip ring stator 32 can also extend downward to connect with the bottom of the groove of the support housing 11 (it can be connected by screws, which is a conventional technical means and will not be described in detail here). In this case, it is not necessary to set a fastening plate.

[0053] In this embodiment, both the first mounting plate and the second mounting plate can be flange rings, which are connected by bolts (which is existing technology and will not be described in detail here). The first mounting plate, the second mounting plate, and the inner hole of the hollow shaft serve as the conductive wires of the inertial measurement mechanism, which pass through the channel to be electrically connected to the slip ring rotor.

[0054] In the above technical solution, the control module 4 is housed within the support housing 11. This allows the control module to operate in a low-dust environment within the support housing, which improves its performance.

[0055] like Figure 5 and Figure 6 As shown, since the rotation drive 12 in this embodiment is installed at the upper inner end of the support housing, the lower inner end of the support housing will have extra space. Therefore, the control module 4 in this embodiment can be directly set at the lower inner end of the support housing, which can improve the utilization efficiency of the space inside the support housing and reduce the overall volume of the dustproof rotation mechanism.

[0056] In this embodiment, when the inertial measurement mechanism 2 is installed on the upper end of the first mounting plate, it can completely cover the upper end of the hollow shaft inner hole, thus preventing dust from entering the support housing through the hollow shaft.

[0057] Example 3 Same as Example 2, except that, as Figure 7As shown, this embodiment provides a single-axis modulation inertial navigation device, which also includes a housing 5 and a cooling fan 6. A second opening 51 is provided in the middle of the lower end of the housing 5. The inertial measurement mechanism 2 is located inside the housing 5, and the upper end of the supporting housing 11 extends into the housing 5 through the second opening 51. The edge of the second opening 51 extends to the outer wall of the supporting housing 11. An air inlet 52 and an air outlet 53 are provided on the housing 5. The air outlet end of the cooling fan 6 is aligned with the air inlet 52. The cooling fan 6 is used to blow air into the housing 5 and is electrically connected to the control module 4. The housing 5 provides protection for the inertial measurement mechanism 2 without affecting its normal rotation, while the cooling fan 6 improves the heat dissipation performance of the inertial measurement mechanism 2.

[0058] like Figure 8 As shown, preferably, the upper end of the support housing 11 extends exactly into the second opening 51. At this time, the top wall of the support housing is flush with the bottom wall of the outer shell (in this embodiment, the edge of the second opening 51 can be turned down to form a connecting ring 511, and multiple screws can be provided on the connecting ring to fasten it to the upper end of the support housing).

[0059] like Figure 7 As shown, in the above technical solution, the air inlet 52 is located at the lower edge of the outer casing 5, and the cooling fan 6 is located on the outer side wall of the support housing 11, below the outer casing 5. This allows the cooling fan 6 to be directly mounted on the side wall of the support housing 11, thus not occupying space inside the outer casing (a wiring hole is provided on the side wall of the support housing near the cooling fan for the power cable of the cooling fan to pass through into the support housing for electrical connection with the control module; a protective coil can be nested at the wiring hole for waterproofing and dustproofing; the power cable passes through the inside of the protective coil, which is prior art and will not be described in detail here).

[0060] Preferred, such as Figure 7 As shown, in the above technical solution, multiple cooling fans 6 and air inlets 52 are provided, and the multiple cooling fans and multiple air inlets correspond one-to-one, with the air outlet of each cooling fan aligned with the corresponding air inlet. This further improves the heat dissipation performance of the inertial measurement mechanism 2.

[0061] In a further preferred embodiment, the cooling fan 6 may have 2-4 air inlets.

[0062] In this embodiment, the cooling fan 6 can be an axial flow fan. In this embodiment, multiple air outlets 53 can be provided, and the multiple air outlets 53 can be evenly distributed on the side walls and / or top walls of the outer casing 5.

[0063] In this embodiment, the structure of the outer shell 5 is similar to that of the supporting shell 11, but its top wall is detachable, which will not be described in detail here.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dustproof turntable mechanism, characterized in that, The system includes a support housing (11), a rotation drive (12), and a first mounting plate (13). The support housing (11) has a first opening (111) at its upper center. The rotation drive (12) has a drive shaft and is installed inside the support housing (11). The upper end of the drive shaft extends out of the support housing (11) through the first opening (111). The first mounting plate (13) is horizontally positioned and coaxially fixedly connected to the upper end of the drive shaft. The upper part of the support housing (11)... The end is recessed with an annular sealing groove (112), the sealing groove (112) is coaxially distributed with the first mounting plate (13), the first opening (111) is located inside the ring of the sealing groove (112), the lower end of the first mounting plate (13) is coaxially protruded with an annular skirt (131), and the skirt (131) is aligned with the sealing groove (112), the lower end of the skirt (131) extends into the sealing groove (112) and makes sealing contact with the groove side wall and / or groove bottom wall of the sealing groove (112).

2. The dustproof turntable mechanism according to claim 1, characterized in that, It also includes a cylindrical support frame (14), which is fixedly disposed on the upper inner end of the support housing (11), and the inner hole of the support frame (14) is aligned with the first opening (111). The rotation drive (12) is embedded in the support frame (14), and both the upper and lower ends of the support frame (14) are rotatably connected to the drive shaft through bearings (15).

3. The dustproof turntable mechanism according to claim 2, characterized in that, The support frame (14) includes an upper cover plate (141) and a lower cylinder (142). The upper cover plate (141) is an annular plate. The lower end of the lower cylinder (142) has a flanged ring (1421). The upper cover plate (141) is coaxially mounted on the upper end of the lower cylinder (142) and together they enclose an annular groove-shaped mounting groove (143). The rotating drive component (12) is embedded in the mounting groove (143). The upper cover plate (141) and / or the lower cylinder (142) are connected to the support housing (11). The upper cover plate (141) and the flanged ring (1421) are rotatably connected to the drive shaft through the bearing (15).

4. The dustproof turntable mechanism according to claim 2, characterized in that, It also includes an angle sensor (16) disposed in the support housing (11), the angle sensor (16) being located below the support frame (14), the angle sensor (16) including a sensor rotor (161) and a sensor stator (162), the sensor rotor (161) being coaxially fixedly connected to the lower end of the drive shaft, and the sensor stator (162) being coaxially fixedly connected to the lower end of the support frame (14).

5. The dustproof turntable mechanism according to any one of claims 1-4, characterized in that, The rotation drive (12) includes a hollow cup torque motor (121) and a hollow shaft (122). The motor rotor (1211) of the hollow cup torque motor (121) is annular, and the hollow shaft (122) is coaxially sleeved inside the motor rotor (1211). The hollow shaft (122) constitutes the drive shaft of the rotation drive (12).

6. A single-axis modulated inertial navigation device, characterized in that, The system includes an inertial measurement unit (2), an electronic slip ring (3), a control module (4), and a dustproof turntable mechanism (1) as described in claim 5. The lower end of the inertial measurement unit (2) has a horizontally arranged second mounting plate (21), which is coaxially connected to the first mounting plate (13). The electronic slip ring (3) is disposed inside the hollow shaft (122). The electronic slip ring (3) has a slip ring rotor (31) and a slip ring stator (32). The slip ring rotor (31) is coaxially fixedly connected to the hollow shaft (122). The slip ring stator (32) is fixedly disposed relative to the support housing (11). The conductive wire of the inertial measurement unit (2) is led through the hollow shaft (122) to be electrically connected to the slip ring rotor (31). The slip ring stator (32) and the dustproof turntable mechanism (1) are both electrically connected to the control module (4).

7. The single-axis modulated inertial navigation device according to claim 6, characterized in that, The control module (4) is located inside the support housing (11).

8. The single-axis modulated inertial navigation device according to claim 6 or 7, characterized in that, It also includes a housing (5) and a cooling fan (6). The housing (5) has a second opening (51) in the middle of its lower end. The inertial measurement mechanism (2) is located inside the housing (5). The upper end of the support housing (11) extends into the housing (5) through the second opening (51). The edge of the second opening (51) extends to the outer wall of the support housing (11). The housing (5) has an air inlet (52) and an air outlet (53). The air outlet of the cooling fan (6) is aligned with the air inlet (52). The cooling fan (6) is used to blow air into the housing (5). The cooling fan (6) is electrically connected to the control module (4).

9. The single-axis modulated inertial navigation device according to claim 8, characterized in that, The air inlet (52) is located at the lower edge of the outer casing (5), and the cooling fan (6) is located on the outer side wall of the support housing (11) and below the outer casing (5).

10. The single-axis modulated inertial navigation device according to claim 8, characterized in that, The cooling fan (6) and the air inlet (52) are both provided with multiple units.

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