A direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal

Abstract

The present invention relates to a direction-finding and position-limiting protection device for a radar antenna pedestal that is capable of rotating in a non-full-circle manner. The device transmits the rotation of the antenna pedestal's turntable through a screw-nut kinematic pair consisting of a rotating lead screw and a special-shaped translational nut, ultimately converting the rotation of the turntable into the distances that the limit sensing plate and the direction-finding sensing plate move up and down within the rectangular slot of a switch bracket. By using the digital feedback from the left and right limit switches and the direction-finding switch installed on the switch bracket, combined with the turntable angle sensor, a position-finding protection and angular direction-finding basis can be provided for a radar antenna pedestal that cannot rotate in a full circle but has a common angular region in both counterclockwise and clockwise rotation. The present invention not only enables safe control of the radar antenna pedestal's operation, but also significantly reduces the development cost of unnecessary slip ring installation, effectively overcomes the cable entanglement and dragging issues associated with the antenna pedestal, and prevents the antenna pedestal from colliding with and impacting surrounding structures.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted air defense weapon equipment, and more particularly to a direction finding and position limiting protection device for a radar antenna pedestal that is continuously rotatable in a non-full circle. Background Art

[0002] As a key component of a radar system, the antenna pedestal not only supports the radar antenna and houses the servo drive mechanism and data processing unit, but also serves as a crucial transmission component for driving the antenna to scan, detect, and track targets. Depending on the functional requirements, there are two designs for radar antenna pedestals: one with a slip ring installed, which allows for continuous full-circle rotation; the other without a slip ring, which allows for limited angular rotation. For antenna pedestals with slip rings, continuous full-circle rotation eliminates the risk of cable entanglement and drag, eliminating the need for direction finding and position limiting devices. However, for vehicle-mounted air defense weapons with missile launchers, fuel engines, optoelectronic components, and other components surrounding the antenna pedestal, continuous full-circle rotation is prohibited to prevent interference and collision between components. Furthermore, some radars are not designed to rotate continuously. While slip rings can be installed to achieve full-circle rotation for these radars, allowing data processing to utilize only the angular range required by their functional design, this design significantly increases development costs and lead times due to the slip rings. For radar pedestals with limited development budgets and short development cycles, this slip ring-based design approach is clearly undesirable. With the continuous advancement of science and technology, many air defense weapons and equipment are facing upgrades and technological advancements. Reducing development costs and lead times while improving detection performance, stability, and reliability is a critical issue that needs to be addressed. Summary of the Invention

[0003] Technical problems to be solved

[0004] For radar antenna pedestals that have no slip ring installed but have a common angular area in counterclockwise and clockwise rotation, the present invention provides a direction finding and position limiting protection device for a radar antenna pedestal that can rotate continuously in a non-full circle. The device is used to prevent the antenna pedestal from colliding with and hitting other surrounding mechanisms such as missile launchers, oil engines, optoelectronics, etc. during rotation, reduce the cable entanglement and dragging problems that may occur inside the antenna pedestal, and provide an analytical basis for the rotation angle measurement of the antenna pedestal.

[0005] Technical Solution

[0006] A direction finding and limit protection device for a radar antenna base that is continuously rotatable in a non-full circle, characterized in that it includes a limit stop transmission pinion, a rotating screw, special-shaped upper and lower translation nuts, an anti-slip nut, a switch bracket, a left limit switch, a limit sensor, a direction finding sensor, a right limit switch, and a direction finding switch. The switch bracket is an "inverted T" shaped design structure, fixed to the bottom surface of the antenna base turntable, and has a rectangular groove perpendicular to its bottom edge; the direction finding switch is located on one side of the switch bracket, and the left limit switch and the right limit switch are located on the other side of the switch bracket; the limit stop transmission pinion is coaxial with the rotating screw, and is located at the lower end of the rotating screw after integrated processing. The moving small gear meshes with the azimuth transmission large gear during rotation; one end of the special-shaped upper and lower translation nut is installed on the rotating screw through its own threaded hole, and forms a screw-nut moving pair with the rotating screw, and two thin metal sensing pieces are fixed on its side, of which the metal sensing piece close to the direction switch and with a larger area is the direction sensing piece, and the other metal sensing piece close to the left limit switch and the right limit switch and with a smaller area is the limit sensing piece; the end of the special-shaped upper and lower translation nut away from the screw hole is inserted into the rectangular slot of the switch bracket, and drives the limit sensing piece and the direction sensing piece to move up and down along the axial direction of the rotating screw; the anti-slip nut is fixed on the top of the rotating screw.

[0007] A further technical solution of the present invention includes a thrust bearing outer ring, a thrust bearing inner ring and a thrust bearing pressure cover, wherein the thrust bearing inner ring is close to the upper end face of the limit stop transmission pinion and is fixed to the rotating screw through the thrust bearing pressure cover, and the thrust bearing outer ring is fixed to the bottom surface of the antenna base turntable; the thrust bearing pressure cover is used to press the thrust bearing inner ring and provide a pre-tightening force to prevent it from loosening by screwing in a screw along its radial direction.

[0008] A further technical solution of the present invention is as follows: the height of the rectangular groove is greater than the length of the special-shaped translation nut between the thrust bearing cover and the anti-slip nut, and the width of the rectangular groove limits the maximum left and right swing angle of the limit sensing plate and the direction sensing plate during the up and down translation along the rotating screw axis driven by the special-shaped up and down translation nut.

[0009] A further technical solution of the present invention is as follows: the height of the direction-detecting sensor piece is 5 times the cross-sectional diameter of the direction-detecting switch, and the width thereof is 2 times the cross-sectional diameter of the direction-detecting switch.

[0010] A further technical solution of the present invention is as follows: the height of the limit sensing piece is three times the cross-sectional diameter of the direction-detecting switch, and the width thereof is twice the cross-sectional diameter of the direction-detecting switch.

[0011] A method for adjusting a limit switch of a direction finding and position limiting protection device for a non-full-circle continuously rotatable radar antenna pedestal is characterized by the following steps:

[0012] Step 1: Connect the left and right limit switches, the antenna base turntable, and the debugging cables of the installed angle measurement sensor. Supply a DC28V power supply to the left and right limit switches. Prepare to use computer software to read the measurement values ​​of the angle measurement sensor and the status feedback of the left and right limit switches.

[0013] Step 2: Push the antenna base turntable to continue to rotate to the left. When the antenna base turntable rotates to its maximum allowable angular position, use computer software to read the measured value of this angular position and the state feedback of the left limit switch and the right limit switch, and mark this angle measurement value as the left limit of the antenna base turntable. At the same time, adjust the installation position of the left limit switch so that it is exactly aligned with the limit sensor.

[0014] Step 3: Continuously adjust the distance between the cross-sectional detection surface of the left limit switch and the limit sensor until the LED on the left limit switch is lit and the computer reads that the state quantity feedback from the left limit switch is a low active level and the state quantity feedback from the right limit switch is a high level;

[0015] Step 4: Push the antenna base turntable in the opposite direction to rotate right. When the antenna base turntable rotates to the right to its maximum allowable angular position, use computer software to read the measured value of this angular position and the state feedback of the left limit switch and the right limit switch, and mark this angle measurement value as the right limit of the antenna base turntable. At the same time, adjust the installation position of the right limit switch so that it is exactly aligned with the limit sensor.

[0016] Step 5: Continuously adjust the distance between the cross-sectional detection surface of the right limit switch and the limit sensor plate until the LED on the right limit switch is lit and the computer reads that the state quantity of the left limit switch feedback is a high level and the state quantity of the right limit switch feedback is a low effective level.

[0017] A method for adjusting a direction finding switch of a direction finding and position limiting protection device for a non-full-circle continuously rotatable radar antenna pedestal is characterized by the following steps:

[0018] Step 1: Stop the antenna base turntable at its initial rotation position 0, and adjust the installation position of the direction-finding switch and the direction-finding sensor sheet so that they are exactly aligned with the lower edge of the direction-finding sensor sheet;

[0019] Step 2: Keep adjusting the distance between the cross-sectional detection surface of the direction-detecting switch and the direction-detecting sensor until the LED on the direction-detecting switch lights up.

[0020] Step 3: Manually push the antenna base turntable to the left and slowly rotate it so that the direction-finding sensor moves upward along the rectangular slot of the switch bracket and out of the detection cross section of the direction-finding switch. At the same time, observe whether the LED on the direction-finding switch turns off automatically. If so, proceed to the next step; otherwise, go to step 1.

[0021] Step 4: Manually push the antenna base turntable to continue to slowly rotate to the left, so that the direction-detecting sensor continues to move upward along the rectangular slot of the switch bracket until the LED light-emitting diode of the left limit switch itself is lit and the left limit switch status value read by the computer is a low effective level. During the process of slowly rotating the antenna base turntable to the left, pay attention to observe whether the LED light-emitting diode of the direction-detecting switch itself is always in the off state. If so, proceed to the next step, otherwise go to step 2;

[0022] Step 5: Manually push the antenna base turntable to the right and slowly rotate it, so that the direction-finding sensor moves downward along the rectangular slot of the switch bracket and continues to approach the direction-finding switch. When the lower edge of the direction-finding sensor is exactly aligned with the detection cross-section of the direction-finding switch, the antenna base turntable should be in its initial rotation 0 position. Continue to slowly rotate the antenna base turntable to the right until the LED light-emitting diode of the right limit switch itself is lit and the right limit switch status value read by the computer is a low effective level. During the process of slowly rotating the antenna base turntable to the right, pay attention to whether the LED light-emitting diode of the direction-finding switch itself is always in the lit state. If it is, proceed to the next step, otherwise go to step 2;

[0023] Step 6: Complete the adjustment process of the direction switch installation position.

[0024] A method for measuring the angle of an antenna pedestal turntable of a direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal, characterized by:

[0025] Assume that the initial position of the antenna pedestal is recorded as angle 0°; Assume that at the left and right limit points of the antenna pedestal, the angle values ​​marked by the angle measuring sensor are M L and M R Assume that the state quantity fed back by the direction-detection switch is a Bool value and is valid at low level, that is, 1 when the antenna pedestal rotates forward and 0 when it rotates reversely. The angle measurement range of the angle sensor installed on the antenna pedestal turntable is 0° to 360° when rotating to the left, and its measurement value is α. Then, the angle measurement resolution value θ of the antenna pedestal turntable finally read by the computer software is:

[0026]

[0027] Beneficial effects

[0028] The present invention provides a direction finding and limit protection device for a radar antenna pedestal that is continuously rotatable in a non-full circle. When the antenna pedestal azimuth axis motor drives the azimuth gear coaxially mounted with the antenna pedestal turntable, the limit stop transmission pinion will also roll along the circumferential direction of the azimuth transmission gear, and keep the entire limit and direction finding mechanism and the antenna pedestal turntable in synchronous rotation. The rotation amount of the antenna pedestal turntable is transmitted through a screw-nut motion pair composed of a rotating screw and a special-shaped translation nut, and is ultimately converted into the distance that the limit sensing piece and the direction finding piece move up and down in the rectangular slot of the switch bracket, respectively. With the help of the digital quantity fed back by the left and right limit switches and the direction finding switch installed on the switch bracket, and in combination with the angle sensor installed on the turntable, it is possible to provide a limit protection and angular direction finding basis for a radar antenna pedestal that can neither rotate in a full circle nor have a common angle area in counterclockwise and clockwise rotation. Compared with the prior art, the beneficial effects are as follows:

[0029] 1. The direction-finding and position-limiting protection device disclosed herein provides technical support for the design and engineering of other radar antenna pedestals that do not rotate continuously in a full circle. For radar antenna pedestals that do not require the installation of slip rings to achieve continuous full-circle rotation, the direction-finding and position-limiting protection device disclosed herein not only enables safe control of the radar antenna pedestal's operation but also significantly reduces the development costs associated with the installation of slip rings.

[0030] 2. Based on the measurement value of the angle sensor installed on the antenna pedestal, combined with the state quantity fed back by the direction finding switch, the problem of difficulty in distinguishing the angle values ​​of the antenna pedestal during forward and reverse rotation due to the existence of a common angle area is effectively solved.

[0031] 3. The direction identification and position limiting protection device of the present invention is used to distinguish the forward and reverse angle values ​​of the antenna pedestal in a common angle area. This method is simple and feasible, stable and reliable, and does not involve complex software processing issues.

[0032] 4. The application of the direction-finding and position-limiting protection device of the present invention to a radar antenna pedestal that is continuously rotatable in a non-full circle effectively overcomes the cable entanglement and dragging problems associated with the antenna pedestal, and prevents the antenna pedestal from colliding with and striking surrounding structures.

[0033] 5. The use of the direction finding and position limiting protection device involved in the present invention ensures the realization of control functions such as left (clockwise) and right (counterclockwise) scanning and positioning of the radar antenna base turntable, which significantly enhances the engineering practicality of the entire servo mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0035] Figure 1 A cross-sectional view showing the positional relationship between the direction-finding and position-limiting protection device and the antenna base turntable of the present invention;

[0036] Figure 2 This is a diagram showing the positional relationship between the direction detection and position limiting protection device and the lower base of the antenna base;

[0037] Figure 3 This is a three-dimensional installation effect diagram of the direction-finding and position-limiting protection device of the present invention on the antenna base;

[0038] Figure 4 Schematic diagram of the rotation of the turntable of a vehicle-mounted air defense radar antenna base.

[0039] exist Figures 1 to 3 The components involved are described as follows:

[0040] 1-Limit stop transmission pinion, 2-Thrust bearing outer ring, 3-Thrust bearing inner ring, 4-Thrust bearing pressure cover, 5-Rotating screw, 6-Up and down translation nuts, 7-Anti-slip nut, 8-Switch bracket, 9-Left limit switch, 10-Limit sensor, 11-Directional sensor, 12-Right limit switch, 13-Directional switch, 14-Side wall of antenna base, 15-Azimuth drive motor mounting hole, 16-Bottom of antenna base turntable, 17-Winding bobbin, 18-Azimuth bearing inner ring, 19-Azimuth bearing outer ring, 20-Azimuth transmission gear, 21-Antenna base base.

[0041] The present invention is introduced here with respect to switch 9 being a left limit switch and limit switch 12 being a right limit switch. In fact, whether switch 9 is a left limit switch and whether limit switch 12 is a right limit switch can only be determined by making corresponding judgments based on the rotation direction of the antenna base turntable 16 and the movement direction of the limit sensor 10 in the rectangular slot of the switch bracket 8. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0043] See attached Figures 1 to 3As shown, a direction-finding and position-limiting protection device for a non-full-turn continuously rotatable radar antenna pedestal includes a limit stop transmission pinion 1, a thrust bearing outer ring 2, a thrust bearing inner ring 3, a thrust bearing gland 4, a rotating lead screw 5, a special-shaped upper and lower translational nut 6, an anti-slip nut 7, a switch bracket 8, a left limit switch 9, a limit sensor 10, a direction-finding sensor 11, a right limit switch 12, and a direction-finding switch 13.The switch bracket 8 is an "inverted T" shaped design structure, the bottom edge of which is fixed to the bottom surface 16 of the antenna seat turntable by 4 M10 screws, and a 20cm (height) × 3cm (width) rectangular groove is opened in the direction perpendicular to its bottom edge; the limit stop transmission pinion 1 is coaxially designed with the rotating screw 5, and is located at the lower end of the rotating screw 5 after integrated processing. The limit stop transmission pinion 1 is engaged with the azimuth transmission gear 20 during rotation; the thrust bearing inner ring 3 is close to the upper end face of the limit stop transmission pinion 1, and is fixed to the rotating screw 5 by the thrust bearing pressure cover 4, and the thrust bearing outer ring 2 is fixed to the bottom surface 16 of the antenna seat turntable by 8 M8 screws; the thrust bearing The pressure cover 4 is used to press the inner ring 3 of the thrust bearing, and provides a pre-tightening force to prevent it from loosening by screwing in an M8 screw along its radial direction. When the antenna base rotates, the limit stop pinion 1 will roll around the circumference of the azimuth transmission gear 20, which will cause the rotating screw 5 to rise or fall. The function of the thrust bearing outer ring 2 and the thrust bearing inner ring 3 is to position the rotating screw 5 so that the rotating screw 5 always remains perpendicular to the bottom surface 16 of the antenna base turntable; one end of the special-shaped upper and lower translation nut 6 is installed on the rotating screw 5 through its own threaded hole, and forms a screw-nut moving pair with the rotating screw 5, and two thin metal sensor sheets are fixed on its side by two M3 screws, which are specified here to be close to the direction switch 13 and face The metal sensing piece with a larger area is the direction sensing piece 11, and the other metal sensing piece with a smaller area, which is close to the left limit switch 9 and the right limit switch 12, is the limit sensing piece 10. Since the end of the special-shaped upper and lower translation nut 6 away from the screw hole is inserted into the rectangular groove of the switch bracket 8, and drives the limit sensing piece 10 and the direction sensing piece 11 to move up and down along the axial direction of the rotating screw 5, the height of the rectangular hole is greater than the length of the special-shaped translation nut 6 between the thrust bearing cover 4 and the anti-slip nut 7. The width of the rectangular hole limits the maximum left and right swing angle of the limit sensing piece 10 and the direction sensing piece 11 in the upper and lower translation along the axial direction of the rotating screw 5 driven by the special-shaped translation nut 6. 1 is 5 times the cross-sectional diameter of the direction switch 13, and its width is 2 times the cross-sectional diameter of the direction switch 13; the height of the limit sensing piece 10 is 3 times the cross-sectional diameter of the direction switch 13, and its width is 2 times the cross-sectional diameter of the direction switch 13, which is set for better sensing; the anti-slip nut 7 is fixed to the top of the rotating screw 5 by a thread. Since the special-shaped upper and lower translation nut 6 is clamped between the thrust bearing pressure cover 4 and the anti-slip nut 7, and can move up and down with the rotating screw 5, the length of the rotating screw 5 between the thrust bearing pressure cover 4 and the anti-slip nut 7 determines the distance that the limit sensing piece 10 and the direction sensing piece 11 move along the rectangular groove left by the special-shaped upper and lower translation nut 6.

[0044] The left limit switch 9 and the right limit switch 12 are installed on the same side of the switch bracket 8, and the direction switch 14 is installed on the other side of the switch bracket 8. In order to distinguish the left limit switch 9 and the right limit switch 12, you can manually push the antenna base turntable to the left (clockwise) and observe the direction in which the limit sensing piece 10 moves along the rectangular slot of the switch bracket 8. If the limit sensing piece 10 moves upward, it means that the limit switch installed on the upper part of the switch bracket 8 is the left limit switch, and the limit switch installed on the lower part of the switch bracket 8 is the right limit switch. Conversely, if the limit sensing piece 10 moves downward, it means that the limit switch installed on the upper part of the switch bracket 8 is the right limit switch 12, and the limit switch installed on the lower part of the switch bracket 8 is the left limit switch 9.

[0045] The adjustment process for the installation position of the left limit switch 9 and the right limit switch 12 is as follows:

[0046] (1) Connect the left limit switch 9, right limit switch 12, antenna base turntable, and the debugging cables of the installed angle measurement sensor, supply DC28V power to the left limit switch 9 and the right limit switch 12, and prepare to use computer software to read the measurement value of the angle measurement sensor and the status value feedback of the left limit switch 9 and the right limit switch 12;

[0047] (2) Push the antenna base turntable to continue to rotate leftward (clockwise). When the antenna base turntable rotates leftward (clockwise) to its maximum allowable angular position, use computer software to read the measured value of this angular position and the state feedback of the left limit switch 9 and the right limit switch 12, and mark this angle measurement value as the left limit of the antenna base turntable. At the same time, adjust the installation position of the left limit switch 9 so that it is exactly aligned with the limit sensor;

[0048] (3) Continuously adjust the distance between the cross-sectional detection surface of the left limit switch 9 and the limit sensing plate until the LED light-emitting diode of the left limit switch 9 is lit and the computer reads that the state quantity feedback from the left limit switch 9 is a low effective level and the state quantity feedback from the right limit switch 12 is a high level;

[0049] (4) Push the antenna base turntable in the opposite direction to rotate right (counterclockwise). When the antenna base turntable rotates right (counterclockwise) to its maximum allowable angular position, use computer software to read the measured value of this angular position and the state feedback of the left limit switch 9 and the right limit switch 12, and mark this angle measurement value as the right limit of the antenna base turntable. At the same time, adjust the installation position of the right limit switch 12 so that it is exactly aligned with the limit sensor;

[0050] (5) Continuously adjust the distance between the cross-sectional detection surface of the right limit switch and the limit sensing plate until the LED light-emitting diode of the right limit switch 12 is lit and the computer reads that the state quantity feedback from the left limit switch 9 is a high level and the state quantity feedback from the right limit switch 12 is a low effective level.

[0051] The process of adjusting the installation position of the direction switch 13 is as follows:

[0052] (1) Stop the antenna base turntable at its initial rotation position 0, and adjust the installation position of the direction-detecting switch 13 and the direction-detecting sensor 11 so that they are exactly aligned with the lower edge of the direction-detecting sensor 11;

[0053] (2) Continuously adjust the distance between the cross-sectional detection surface of the direction-detecting switch 13 and the direction-detecting sensor 11 until the LED light-emitting diode of the direction-detecting switch 13 is lit;

[0054] (3) Manually push the antenna base turntable to the left (clockwise) and slowly rotate it so that the direction-detecting sensor 11 moves upward along the rectangular slot of the switch bracket 8 and out of the detection cross section of the direction-detecting switch. At the same time, observe whether the LED light-emitting diode of the direction-detecting switch itself turns off automatically. If so, proceed to the next step; otherwise, proceed to step (1);

[0055] (4) Push the antenna base turntable to continue to rotate slowly to the left (clockwise) by hand, so that the direction-detecting sensor 11 continues to move upward along the rectangular slot of the switch bracket 8, until the LED light-emitting diode of the left limit switch 9 itself is lit and the state quantity of the left limit switch 9 read by the computer is a low effective level. During the process of the antenna base turntable slowly rotating to the left (clockwise), pay attention to observe whether the LED light-emitting diode of the direction-detecting switch 13 itself is always in the off state. If so, proceed to the next step, otherwise go to step (2);

[0056] (5) Push the antenna base turntable to the right (counterclockwise) slowly by hand, so that the direction-finding sensor 11 moves downward along the rectangular slot of the switch bracket 8 and continuously approaches the direction-finding switch 13. When the lower edge of the direction-finding sensor 11 is exactly aligned with the detection cross section of the direction-finding switch 13, the antenna base turntable should be in its initial rotation 0 position. Continue to slowly rotate the antenna base turntable to the right (counterclockwise) until the LED light-emitting diode of the right limit switch 12 itself is lit and the state quantity of the right limit switch 12 read by the computer is a low effective level. During the process of slowly rotating the antenna base turntable to the right (counterclockwise), pay attention to observe whether the LED light-emitting diode of the direction-finding switch 13 itself is always in the lit state. If so, proceed to the next step, otherwise proceed to step (2);

[0057] (6) Complete the adjustment process of the installation position of the direction switch 13.

[0058] Working principle of the present invention:

[0059] When the antenna base azimuth axis motor installed at position 15 drives the azimuth gear 20 coaxially installed with the antenna base turntable 16, since the azimuth transmission gear 20 is fixed to the azimuth bearing outer ring 19 and the antenna base base 21, the azimuth axis motor will drive the antenna base turntable 16 and the azimuth bearing inner ring 18 to rotate in the opposite direction. At the same time, the limit stop transmission pinion 1 is fixed to the antenna base turntable 16 and meshes with the azimuth transmission gear 20, so the limit stop transmission pinion 1 will also roll along the circumferential direction of the azimuth transmission gear 20, and keep the entire limit and direction identification mechanism and the antenna base turntable 16 rotating synchronously. Because the rectangular slot in switch bracket 8 restricts the left and right swing angles of the position-limiting and direction-detecting plates 10 and 11 carried by the shaped upper and lower translation nuts 6, the rotation of the antenna pedestal 16 is transmitted through the screw-nut kinematic pair formed by the rotating lead screw 5 and the shaped translation nut 6, ultimately converting the vertical movement distances of the position-limiting and direction-detecting plates 10 and 11 within the rectangular slot in switch bracket 8. By leveraging the digital feedback from the left and right limit switches and direction-detecting switch mounted on the switch bracket, combined with the angle sensor mounted on the pedestal, position-limiting protection and angular direction detection can be provided for radar antenna pedestals that cannot rotate a full circle but have a common angular range in both counterclockwise and clockwise rotation.

[0060] For antenna pedestal 16 with the left and right limit switches already adjusted, during operation, when it rotates leftward (clockwise) to the maximum permissible angular position (left limit position), the LED light-emitting diode of the left limit switch 9 illuminates, and the computer reads that the status of the left limit switch 9 is at an active low level, while the status of the right limit switch 12 is at a high level. Next, the antenna pedestal 16 rotates in the opposite direction. When it rotates rightward (counterclockwise) to the maximum permissible angular position (right limit position), the LED light-emitting diode of the right limit switch 12 illuminates, and the computer reads that the status of the left limit switch 9 is at a high level, while the status of the right limit switch 12 is at an active low level.

[0061] For the antenna pedestal 16 with the orientation switch 13 installed at an adjusted position, when it is rotated from the initial 0 position to the left (clockwise) to the left limit position, the LED light-emitting diode of the orientation switch 13 itself should be in an off state, and the state quantity fed back to the computer by the orientation switch 13 should remain at a high level "1". Conversely, when the antenna pedestal 16 is rotated from the initial 0 position to the right (counterclockwise) to the right limit position, the LED light-emitting diode of the orientation switch 13 itself should be in an on state, and the state quantity fed back to the computer by the orientation switch 13 should remain at a low level "0". Assume that the rotation diagram of the antenna pedestal 16 of a vehicle-mounted air defense radar is as follows Figure 4 shown.

[0062] The angle sensor installed on the turntable using the state quantity feedback from the direction finding switch can provide corresponding direction finding basis for the angle analysis of the radar antenna base which cannot rotate a full circle but has a common angle area in counterclockwise and clockwise rotation.

[0063] Assuming that the initial position of the antenna base turntable is recorded as angle 0°, at the left and right limit points of the antenna base turntable, the angle values ​​marked by the angle measuring sensor are M L and M R , that is, in the clockwise rotation process, its angle range is (360-M R )~M L The area is the same as the area when rotating counterclockwise (360-M L )~M R The angle ranges coincide exactly; assuming the state quantity fed back by the direction-detection switch is a bool value, and the low level is valid (1 when the antenna base rotates forward, 0 when it rotates reversely); the angle measurement range of the angle sensor installed on the antenna base turntable when rotating to the left (clockwise) is 0° to 360°, and its measurement value is α; then the antenna base turntable angle measurement resolution value θ finally read by the computer software is:

[0064]

[0065] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present invention, and these modifications or replacements should all be included in the scope of protection of the present invention.

Claims

1. A direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal, characterized in that The invention comprises a limit stop transmission pinion (1), a rotating lead screw (5), a special-shaped upper and lower translation nut (6), an anti-slip nut (7), a switch bracket (8), a left limit switch (9), a limit sensing plate (10), a direction sensing plate (11), a right limit switch (12), and a direction switch (13). The switch bracket (8) is an "inverted T" shaped structure, fixed on the bottom surface (16) of the antenna base turntable, and has a rectangular groove perpendicular to its bottom edge. The direction switch (13) is located on one side of the switch bracket (8), and the left limit switch (9) and the right limit switch (12) are located on the other side of the switch bracket (8). The limit stop transmission pinion (1) is coaxial with the rotating lead screw (5), and is located at the lower end of the rotating lead screw (5) after being integrally processed and formed. The limit stop transmission pinion (1) rotates The axial direction of the rotating screw (5) is meshed with the azimuth transmission gear (20); one end of the special-shaped upper and lower translation nut (6) is installed on the rotating screw (5) through its own threaded hole, and forms a screw nut motion pair with the rotating screw (5), and two thin metal sensing pieces are fixed on its side, wherein the metal sensing piece close to the direction switch (13) and with a larger area is the direction sensing piece (11), and the other metal sensing piece close to the left limit switch (9) and the right limit switch (12) and with a smaller area is the limit sensing piece (10); the end of the special-shaped upper and lower translation nut (6) away from the screw hole is inserted into the rectangular groove of the switch bracket (8), and drives the limit sensing piece (10) and the direction sensing piece (11) to move vertically along the axial direction of the rotating screw (5); the anti-slip nut (7) is fixed on the top of the rotating screw (5).

2. The direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal according to claim 1, characterized in that The invention also includes a thrust bearing outer ring (2), a thrust bearing inner ring (3) and a thrust bearing pressure cover (4), wherein the thrust bearing inner ring (3) is close to the upper end surface of the limit stop transmission pinion (1) and is fixed to the rotating screw (5) through the thrust bearing pressure cover (4), and the thrust bearing outer ring (2) is fixed to the bottom surface (16) of the antenna base turntable; the thrust bearing pressure cover (4) is used to press the thrust bearing inner ring (3) and provide a pre-tightening force to prevent it from loosening by screwing a screw in along its radial direction.

3. The direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal according to claim 2, characterized in that The height of the rectangular groove is greater than the length of the special-shaped upper and lower translation nut (6) between the thrust bearing cover (4) and the anti-slip nut (7), and the width of the rectangular groove limits the maximum left and right swing angle of the limit sensing piece (10) and the direction sensing piece (11) when driven by the special-shaped upper and lower translation nut (6) along the axial direction of the rotating screw (5) in the upper and lower translation.

4. The direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal according to claim 1, characterized in that The height of the direction-detecting sensor sheet (11) is 5 times the diameter of the cross section of the direction-detecting switch (13), and the width of the direction-detecting sensor sheet (11) is 2 times the diameter of the cross section of the direction-detecting switch (13).

5. The direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal according to claim 1 is characterized in that The height of the limit sensing piece (10) is three times the diameter of the cross section of the direction identification switch (13), and the width thereof is twice the diameter of the cross section of the direction identification switch (13).

6. A limit switch adjustment method for a direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal according to claim 1, characterized in that Here are the steps: Step 1: Connect the left and right limit switches, the antenna base turntable, and the debugging cables of the installed angle measurement sensor. Supply a DC28V power supply to the left and right limit switches. Prepare to use computer software to read the measurement values ​​of the angle measurement sensor and the status feedback of the left and right limit switches. Step 2: Push the antenna base turntable to continue to rotate to the left. When the antenna base turntable rotates to its maximum allowable angular position, use computer software to read the measured value of this angular position and the state feedback of the left limit switch and the right limit switch, and mark this angle measurement value as the left limit of the antenna base turntable. At the same time, adjust the installation position of the left limit switch so that it is exactly aligned with the limit sensor. Step 3: Continuously adjust the distance between the cross-sectional detection surface of the left limit switch and the limit sensor until the LED on the left limit switch is lit and the computer reads that the state quantity feedback from the left limit switch is a low active level and the state quantity feedback from the right limit switch is a high level; Step 4: Push the antenna base turntable in the opposite direction to rotate right. When the antenna base turntable rotates to the right to its maximum allowable angular position, use computer software to read the measured value of this angular position and the state feedback of the left limit switch and the right limit switch, and mark this angle measurement value as the right limit of the antenna base turntable. At the same time, adjust the installation position of the right limit switch so that it is exactly aligned with the limit sensor. Step 5: Continuously adjust the distance between the cross-sectional detection surface of the right limit switch and the limit sensor plate until the LED on the right limit switch is lit and the computer reads that the state quantity of the left limit switch feedback is a high level and the state quantity of the right limit switch feedback is a low effective level.

7. A method for adjusting the direction finding switch of a direction finding and position limiting protection device for a non-full circle continuously rotatable radar antenna pedestal according to claim 1, characterized in that Here are the steps: Step 1: Stop the antenna base turntable at its initial rotation position 0, and adjust the installation position of the direction-finding switch and the direction-finding sensor sheet so that they are exactly aligned with the lower edge of the direction-finding sensor sheet; Step 2: Keep adjusting the distance between the cross-sectional detection surface of the direction-detecting switch and the direction-detecting sensor until the LED on the direction-detecting switch lights up. Step 3: Manually push the antenna base turntable to the left and slowly rotate it so that the direction-finding sensor moves upward along the rectangular slot of the switch bracket and out of the detection cross section of the direction-finding switch. At the same time, observe whether the LED on the direction-finding switch turns off automatically. If so, proceed to the next step; otherwise, go to step 1. Step 4: Manually push the antenna base turntable to continue to slowly rotate to the left, so that the direction-detecting sensor continues to move upward along the rectangular slot of the switch bracket until the LED light-emitting diode of the left limit switch itself is lit and the left limit switch status value read by the computer is a low effective level. During the process of slowly rotating the antenna base turntable to the left, pay attention to observe whether the LED light-emitting diode of the direction-detecting switch itself is always in the off state. If so, proceed to the next step, otherwise go to step 2; Step 5: Manually push the antenna base turntable to the right and slowly rotate it, so that the direction-finding sensor moves downward along the rectangular slot of the switch bracket and continues to approach the direction-finding switch. When the lower edge of the direction-finding sensor is exactly aligned with the detection cross-section of the direction-finding switch, the antenna base turntable should be in its initial rotation 0 position. Continue to slowly rotate the antenna base turntable to the right until the LED light-emitting diode of the right limit switch itself is lit and the right limit switch status value read by the computer is a low effective level. During the process of slowly rotating the antenna base turntable to the right, pay attention to whether the LED light-emitting diode of the direction-finding switch itself is always in the lit state. If it is, proceed to the next step, otherwise go to step 2; Step 6: Complete the adjustment process of the direction switch installation position.

8. A method for measuring the angle of an antenna pedestal turntable of a direction finding and position limiting protection device for a non-full-circle continuously rotatable radar antenna pedestal according to claim 1, characterized in that: Assume that the initial position of the antenna pedestal is recorded as angle 0°; Assume that at the left and right limit points of the antenna pedestal, the angle values ​​marked by the angle measuring sensor are M L and M R Assume that the state quantity fed back by the direction-detection switch is a Bool value and is valid at low level, that is, 1 when the antenna pedestal rotates forward and 0 when it rotates reversely. The angle measurement range of the angle sensor installed on the antenna pedestal turntable is 0° to 360° when rotating to the left, and its measurement value is α. Then, the angle measurement resolution value θ of the antenna pedestal turntable finally read by the computer software is:

Images