A pitch angle adjustment device for rain measuring radar

By introducing a lubricating mechanism into the pitch angle adjustment device of the rain measurement radar and lubrication of the screw using solid lubricating paste, the accuracy problems caused by screw friction and wear in the prior art are solved, and higher accuracy and longer service life are achieved.

CN119755468APending Publication Date: 2025-04-04SHAOXING WATER CONSERVANCY & HYDROPOWER SURVEY & DESIGN INSTITUTE CO LTD +1
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Patent Information

Application Number
CN202411911378.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-24
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The existing rain radar pitch angle adjustment device can easily increase the friction and wear of the screw during frequent adjustments, resulting in poor accuracy.

Method used

A rain measurement radar pitch angle adjustment device including a lubricating mechanism is designed to lubricate the screw thread through solid lubricating paste to reduce friction and wear between the screw and the nut.

Benefits of technology

It effectively reduces the friction and wear of the screw and improves the accuracy of the pitch angle adjustment of the rain measurement radar.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to the field of rain measuring radar engineering, and in particular to a rain measuring radar pitch angle adjustment device. The existing rain measuring radar pitch angle adjustment device requires the rain measuring radar to frequently adjust and detect each pitch angle, which is easy to increase the friction and wear of the screw, causing the screw to deviate when adjusting the pitch angle of the rain measuring radar, resulting in poor accuracy of the rain measuring radar. A rain measuring radar pitch angle adjustment device includes a quadrilateral base, etc.; a support ring is fixedly connected to the top of the quadrilateral base, a servo motor is fixedly connected to the quadrilateral base, a rotating mechanism is provided on the support ring, an adjusting mechanism is provided on the rotating mechanism, and a rain measuring radar is provided on the adjusting mechanism. Lubricating paste is applied to the screw by solid lubricating paste, and the lubricating paste on the screw thread is diffused to the entire screw by a nut, thereby reducing the friction and wear between the screw and the nut, thereby improving the accuracy of the pitch angle adjustment of the rain measuring radar.
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Description

Technical Field

[0001] The invention relates to the field of rain measuring radar engineering, and in particular to a rain measuring radar pitch angle adjustment device. Background Art

[0002] A rain radar is an instrument used to detect and monitor precipitation. It detects the presence, intensity, and distribution of precipitation by emitting and receiving electromagnetic waves.

[0003] Existing rain measuring radars are generally installed on a base through an articulated seat, and the pitch angle is adjusted by an adjusting mechanism. Most of the existing rain measuring radar pitch angle adjustment devices adjust the pitch angle by rotating a hand wheel to control the rotation of a screw. At the same time, the rain measuring radar is required to frequently adjust and detect each pitch angle, which easily increases the friction and wear of the screw, causing the screw to deviate when adjusting the pitch angle of the rain measuring radar, resulting in poor accuracy of the rain measuring radar. Summary of the invention

[0004] In order to overcome the disadvantage that the existing pitch angle adjustment device of the rain measuring radar needs to frequently adjust and detect each pitch angle, which easily increases the friction and wear of the screw and causes deviation of the screw when adjusting the pitch angle of the rain measuring radar, resulting in poor accuracy of the rain measuring radar. The present invention provides a pitch angle adjustment device of a rain measuring radar that can lubricate the screw when adjusting the pitch angle of the rain measuring radar, thereby reducing the friction and wear of the screw and improving the accuracy of the rain measuring radar.

[0005] A device for adjusting the pitch angle of a rain measuring radar comprises a quadrilateral base, a support ring is fixedly connected to the top of the quadrilateral base, a servo motor is fixedly connected to the quadrilateral base, a rotating mechanism is provided on the support ring, an adjusting mechanism is provided on the rotating mechanism, a rain measuring radar is provided on the adjusting mechanism, the rotating mechanism is used to change the direction of the rain measuring radar, the adjusting mechanism is used to adjust the pitch angle of the rain measuring radar, a lubricating mechanism is provided on the adjusting mechanism, and the lubricating mechanism is used to lubricate the adjusting mechanism.

[0006] Furthermore, the rotating mechanism includes a power shaft, the power shaft is fixedly connected to the output shaft of the servo motor, a pinion is fixedly connected to the power shaft, an annular support is rotatably connected to the support ring, a fixed gear ring is fixedly connected to the inner side of the annular support, the fixed gear ring is meshed with the pinion, and a support seat is fixedly connected to the outer side of the annular support.

[0007] Furthermore, the adjustment mechanism includes a rotating ring, which is rotatably connected to the support seat, a screw is fixedly connected to the rotating ring, an octagonal handle is fixedly connected to the lower part of the screw, a fixed square guide plate is fixedly connected to the upper part of the support seat, a movable square rod is slidably connected to the fixed square guide plate, a sliding groove is opened on the upper part of the movable square rod, a nut is fixedly connected to the lower part of the movable square rod, the nut is threadedly connected to the screw, an arc plate is rotatably connected to the annular support, the upper part of the arc plate is slidably connected to the sliding groove of the movable square rod, and a rain measuring radar is fixedly connected to the middle part of the arc plate.

[0008] Furthermore, the lubrication mechanism includes a fixed seat, the lower part of the movable square rod is fixedly connected to the fixed seat, the bottom of the fixed seat is provided with a hole groove, both sides of the fixed seat are slidably connected with lifting rods, extrusion springs are connected between the two lifting rods and the fixed seat, an extrusion seat is fixedly connected between the bottoms of the two lifting rods, a groove is provided in the middle of the extrusion seat, and solid lubricating paste is placed inside the groove of the extrusion seat.

[0009] Furthermore, the solid lubricating paste is located inside the groove of the extrusion seat and inside the hole groove of the fixing seat.

[0010] Furthermore, it also includes a squeezing mechanism, which is arranged on the fixed square guide plate, and is used to squeeze the lifting rod. The squeezing mechanism includes an extension rod, and the two sides of the fixed square guide plate are fixedly connected with extension rods, the bottoms of the two extension rods are fixedly connected with fixed squeezing rods, the lower sides of the two extension rods are fixedly connected with blocking rods, the two sides of the two fixed squeezing rods close to one end of the lifting rod are fixedly connected with fixing bolts, torsion springs are connected between the two fixing bolts and the fixed squeezing rods, and the two fixed squeezing rods are rotatably connected with squeezing plates close to one end of the lifting rods.

[0011] Furthermore, a pitch angle calibration rod is also included. A square groove is opened on the upper surface of the fixed square guide plate, and the pitch angle calibration rod is fixedly connected to the square groove of the fixed square guide plate.

[0012] Furthermore, the pitch angle calibration rod is engraved with pitch angle numbers.

[0013] The beneficial effects of the present invention are: 1. The user starts the servo motor, and the output shaft of the servo motor drives the power shaft and the pinion to rotate, and the pinion drives the fixed gear, the annular support, the support seat, the fixed square guide plate, the movable square rod, the arc plate and the rain measuring radar to rotate, thereby measuring rain in all directions.

[0014] 2. The fixed seat drives the lifting rod, the extrusion spring, the extrusion seat and the solid lubricant to move together. The solid lubricant is applied to the thread of the screw while moving. The nut moves and contacts the screw coated with the lubricant, and then the lubricant on the screw thread is applied to the screw through the nut. The moving square rod drives the arc plate and the rain measuring radar to swing, so that the pitch angle of the rain measuring radar is changed. The screw is coated with lubricant through the solid lubricant, and then the lubricant on the screw thread is spread to the entire screw through the nut, thereby reducing the friction and wear between the screw and the nut, thereby improving the accuracy of the pitch angle adjustment of the rain measuring radar.

[0015] 3. By fixing the extrusion rod, torsion spring and extrusion plate, when the fixed seat and the two lifting rods move toward the direction close to the support seat, the solid lubricant is out of contact with the screw, thereby reducing the consumption of solid lubricant and avoiding excessive lubricant on the screw. When the fixed seat and the two lifting rods move in the direction away from the support seat, the fixed lubricant lubricates the screw first, and then the nut further lubricates the thread, thereby ensuring sufficient lubrication of the screw while reducing the waste of solid lubricant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0017] Figure 2 It is a partial three-dimensional structural schematic diagram of the rotating mechanism and the adjusting mechanism of the present invention.

[0018] Figure 3 It is a partial three-dimensional structural schematic diagram of the rotating mechanism of the present invention.

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the support seat and part of the adjustment mechanism of the present invention.

[0020] Figure 5 It is a schematic diagram of the split three-dimensional structure of the support ring and the annular support of the present invention.

[0021] Figure 6 It is a three-dimensional structural schematic diagram of part of the adjusting mechanism and the extruding mechanism of the present invention.

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of part of the extrusion mechanism of the present invention.

[0023] Figure 8 It is a three-dimensional structural schematic diagram of the lubrication mechanism of the present invention.

[0024] Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixed square guide plate, the movable square rod and the pitch angle calibration rod of the present invention.

[0025] In the above figures: 1: quadrilateral base, 2: support ring, 3: servo motor, 41: power shaft, 42: pinion, 43: annular support, 44: fixed gear ring, 45: support seat, 51: rotating ring, 52: screw, 53: octagonal handle, 54: fixed square guide plate, 55: nut, 56: moving square rod, 57: arc plate, 6: rain measuring radar, 71: fixed seat, 72: lifting rod, 73: extrusion spring, 74: extrusion seat, 75: solid lubricating paste, 81: extension rod, 82: fixed extrusion rod, 83: stop rod, 84: fixing bolt, 85: torsion spring, 86: extrusion plate, 9: pitch angle calibration rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1: A device for adjusting the pitch angle of a rain measuring radar, such as Figure 1-Figure 6 and Figure 8 As shown, it includes a quadrilateral base 1, a support ring 2 is welded on the top of the quadrilateral base 1, a servo motor 3 is fixedly connected to the quadrilateral base 1, a rotating mechanism is provided on the support ring 2, an adjusting mechanism is provided on the rotating mechanism, a rain measuring radar 6 is provided on the adjusting mechanism, the rotating mechanism is used to change the direction of the rain measuring radar 6, the adjusting mechanism is used to adjust the pitch angle of the rain measuring radar 6, and a lubricating mechanism is provided on the adjusting mechanism, and the lubricating mechanism is used to lubricate the adjusting mechanism.

[0028] The rotating mechanism includes a power shaft 41, the power shaft 41 is fixedly connected to the output shaft of the servo motor 3, a pinion 42 is connected to the power shaft 41 via a flat key, an annular support 43 is rotatably connected to the support ring 2, the pinion 42 is used to drive the annular support 43 to rotate, a fixed gear ring 44 is welded on the inner side of the annular support 43, the fixed gear ring 44 is meshed with the pinion 42, and a support seat 45 is welded on the outer side of the annular support 43.

[0029] The adjusting mechanism includes a rotating ring 51, which is rotatably connected to the support seat 45, and a screw 52 is welded to the rotating ring 51. An octagonal handle 53 is welded to the lower part of the screw 52, ​​and the octagonal handle 53 is used for rotation by the user. A fixed square guide plate 54 is welded to the upper part of the support seat 45, and a movable square rod 56 is slidably connected to the fixed square guide plate 54, and the fixed square guide plate 54 is used to guide the movable square rod 56. A sliding groove is opened on the upper part of the movable square rod 56, and a nut 55 is fixedly connected to the lower part of the movable square rod 56, and the nut 55 is threadedly connected to the screw 52. An arc plate 57 is rotatably connected to the annular support 43, and the arc plate 57 is used to support the rain measuring radar 6. The upper part of the arc plate 57 is slidably connected to the sliding groove of the movable square rod 56, and the middle part of the arc plate 57 is fixedly connected to the rain measuring radar 6.

[0030] The lubrication mechanism includes a fixed seat 71, the fixed seat 71 is welded to the lower part of the movable square rod 56, a hole groove is opened at the bottom of the fixed seat 71, lifting rods 72 are slidably connected to both sides of the fixed seat 71, and extrusion springs 73 are connected between the two lifting rods 72 and the fixed seat 71, and an extrusion seat 74 is welded between the bottoms of the two lifting rods 72, and a groove is opened in the middle of the extrusion seat 74, and a solid lubricating paste 75 is placed inside the groove of the extrusion seat 74. The solid lubricating paste 75 is located inside the groove of the extrusion seat 74 and in the hole groove of the fixed seat 71, and the solid lubricating paste 75 is used to lubricate the screw 52.

[0031] At first, under the elastic force of the two squeezing springs 73, the two squeezing springs 73 push the two lifting rods 72 to contact the bottom of the fixing seat 71. When the direction of the rain measuring radar 6 needs to be adjusted, the user starts the servo motor 3, and the output shaft of the servo motor 3 drives the power shaft 41 and the pinion 42 to rotate, and the pinion 42 drives the fixed gear, the annular support 43, the support seat 45, the fixed square guide plate 54, the movable square rod 56, the arc plate 57 and the rain measuring radar 6 to rotate, so as to measure rain in all directions. When the pitch angle of the rain measuring radar 6 needs to be adjusted, the user pulls the squeezing seat 74 to move in the direction away from the fixing seat 71, and the squeezing seat 74 brings The two lifting rods 72 are also moved, the two squeezing springs 73 are compressed, and then the solid lubricating paste 75 is placed in the groove in the middle of the squeezing seat 74. Then the user lets go, and under the elastic force of the two squeezing springs 73, the squeezing seat 74 pushes the solid lubricating paste 75 to be in close contact with the thread of the screw 52. Then the user holds the octagonal handle 53 and reverses it. The octagonal handle 53 reverses and drives the rotating ring 51 and the screw 52 to reverse. Through the guidance of the fixed square guide plate 54, the screw 52 reverses and drives the nut 55, the moving square rod 56 and the fixed seat 71 to move in the direction close to the support seat 45. The moving square rod 56 drives the arc plate 57 and The rain radar 6 swings, the arc plate 57 slides with the slide groove of the movable square rod 56, the fixed seat 71 moves to drive the lifting rod 72, the extrusion spring 73, the extrusion seat 74 and the solid lubricating paste 75 to move together, and the solid lubricating paste 75 moves to apply the thread on the screw 52. After the fixed seat 71 moves to the lowest point, the user holds the octagonal handle 53 and rotates forward. The octagonal handle 53 rotates forward to drive the rotating ring 51 and the screw 52 to rotate forward. The screw 52 rotates forward to drive the nut 55, the movable square rod 56 and the fixed seat 71 to move in a direction away from the support seat 45. The fixed seat 71 drives the lifting rod 72, the extrusion spring 73, the extrusion seat 74 and the solid lubricating paste 75. The solid lubricant 75 moves together, and the lubricant is applied to the thread of the screw 52 while moving. The nut 55 moves and contacts the screw 52 coated with the lubricant, and then the lubricant on the thread of the screw 52 is applied to the screw 52 through the nut 55. The moving square rod 56 moves to drive the arc plate 57 and the rain measuring radar 6 to swing, so that the pitch angle of the rain measuring radar 6 changes. The lubricant is applied to the screw 52 through the solid lubricant 75, and then the lubricant on the thread of the screw 52 is diffused to the entire screw 52 through the nut 55, thereby reducing the friction and wear between the screw 52 and the nut 55, thereby improving the accuracy of the pitch angle adjustment of the rain measuring radar 6.

[0032] Embodiment 2: Based on embodiment 1, Figure 7As shown, it also includes an extrusion mechanism, which is arranged on the fixed square guide plate 54, and is used to extrude the lifting rod 72. The extrusion mechanism includes an extension rod 81, and the extension rods 81 are welded on both sides of the fixed square guide plate 54, and the bottoms of the two extension rods 81 are welded with fixed extrusion rods 82, and the lower sides of the two extension rods 81 are welded with baffle rods 83, and the two sides of the two fixed extrusion rods 82 near the lifting rod 72 are welded with fixing bolts 84, and torsion springs 85 are connected between the two fixing bolts 84 and the fixed extrusion rods 82. The two fixed extrusion rods 82 are rotatably connected to the extrusion plates 86 at one end near the lifting rod 72, and the two baffle rods 83 limit the two extrusion plates 86.

[0033] When the fixing seat 71 drives the two lifting rods 72 to move in the direction close to the supporting seat 45, the upper parts of the two lifting rods 72 are in contact with the lower inclined surface of the extrusion plate 86, and the two blocking rods 83 block the extrusion plate 86. The two lifting rods 72 continue to move in the direction close to the supporting seat 45. The two extrusion plates 86 squeeze the two lifting rods 72, so that the two lifting rods 72 move in the direction away from the screw 52. The movement of the two lifting rods 72 in the direction away from the screw 52 drives the extrusion seat 74 and the solid lubricating paste 75 to move together, and the solid lubricating paste 75 is out of contact with the thread of the screw 52, ​​and the solid lubricating paste 75 no longer presses the screw 52. The fixed seat 71 and the two lifting rods 72 continue to move toward the direction close to the support seat 45, and the two lifting rods 72 contact the lower sides of the two fixed extrusion rods 82. The two fixed extrusion rods 82 squeeze the lifting rods 72, so that when the nut 55 moves toward the support seat 45, the solid lubricating paste 75 no longer lubricates the screw 52 through the extrusion plate 86 and the fixed extrusion rod 82, and the two lifting rods 72 continue to move along the fixed extrusion rods 82. When the two lifting rods 72 are out of contact with the fixed extrusion rods 82, the two fixed extrusion rods 82 no longer squeeze the lifting rods 72, and the two lifting rods 72 are in the two extrusion rods. The spring 73 drives the extrusion seat 74 and the solid lubricating paste 75 to reset, and the solid lubricating paste 75 contacts the thread of the screw 52 again. When the fixed seat 71 drives the two lifting rods 72 to move in the direction away from the support seat 45, the solid lubricating paste 75 lubricates the screw 52. When the two lifting rods 72 move to the upper side of the extrusion plate 86, the two lifting rods 72 continue to move and squeeze the two extrusion plates 86. Both swing around the fixing bolt 84, the torsion spring 85 is twisted, and the two lifting rods 72 continue to move and are out of contact with the extrusion plates 86. The two extrusion plates 86 are reset under the action of the torsion spring 85. The two blocking rods 83 are pressed against the two The extrusion plate 86 is limited, and by fixing the extrusion rod 82, the torsion spring 85 and the extrusion plate 86, when the fixed seat 71 and the two lifting rods 72 move in the direction toward the support seat 45, the solid lubricant 75 is out of contact with the screw 52, ​​thereby reducing the consumption of the solid lubricant 75 and also avoiding excessive lubricant on the screw 52. When the fixed seat 71 and the two lifting rods 72 move in the direction away from the support seat 45, the fixed lubricant first lubricates the screw 52, ​​and then the nut 55 further lubricates the thread, thereby ensuring that the screw 52 is sufficiently lubricated while also reducing the waste of the solid lubricant 75.

[0034] Embodiment 3: Based on embodiment 2, Fig. 9 As shown, a pitch angle calibration rod 9 is also included. A square groove is opened on the upper surface of the fixed square guide plate 54. The pitch angle calibration rod 9 is welded on the square groove of the fixed square guide plate 54. The pitch angle calibration rod 9 is engraved with the pitch angle number.

[0035] Since the pitch angle calibration rod 9 is fixed in the direction groove of the fixed square guide plate 54, the movable square rod 56 moves corresponding to the angle of the pitch angle calibration rod 9. The pitch angle calibration rod 9 can facilitate the observation of the pitch angle of the rain measuring radar 6, thereby making the pitch angle adjustment more accurate.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A pitch angle adjustment device for a rain measuring radar, characterized in that: The invention comprises a quadrilateral base (1), a support ring (2) is fixedly connected to the top of the quadrilateral base (1), a servo motor (3) is fixedly connected to the quadrilateral base (1), a rotating mechanism is provided on the support ring (2), an adjusting mechanism is provided on the rotating mechanism, a rain measuring radar (6) is provided on the adjusting mechanism, the rotating mechanism is used to change the direction of the rain measuring radar (6), the adjusting mechanism is used to adjust the elevation angle of the rain measuring radar (6), and a lubricating mechanism is provided on the adjusting mechanism, and the lubricating mechanism is used to lubricate the adjusting mechanism.

2. A rain measuring radar pitch angle adjustment device according to claim 1, characterized in that: The rotating mechanism comprises a power shaft (41), the power shaft (41) is fixedly connected to the output shaft of the servo motor (3), a pinion (42) is fixedly connected to the power shaft (41), an annular support (43) is rotatably connected to the support ring (2), a fixed gear ring (44) is fixedly connected to the inner side of the annular support (43), the fixed gear ring (44) is meshed with the pinion (42), and a support seat (45) is fixedly connected to the outer side of the annular support (43).

3. A rain measuring radar pitch angle adjustment device according to claim 2, characterized in that: The adjusting mechanism comprises a rotating ring (51), the supporting seat (45) is rotatably connected with the rotating ring (51), the rotating ring (51) is fixedly connected with a screw rod (52), the lower part of the screw rod (52) is fixedly connected with an octagonal handle (53), the upper part of the supporting seat (45) is fixedly connected with a fixed square guide plate (54), the fixed square guide plate (54) is slidably connected with a moving square rod (56), the upper part of the moving square rod (56) is provided with a sliding groove, the lower part of the moving square rod (56) is fixedly connected with a nut (55), the nut (55) is threadedly connected to the screw rod (52), the annular support (43) is rotatably connected with an arc plate (57), the upper part of the arc plate (57) is slidably connected with the sliding groove of the moving square rod (56), and the middle part of the arc plate (57) is fixedly connected with a rain measuring radar (6).

4. A device for adjusting the pitch angle of a rain measuring radar according to claim 3, characterized in that: The lubrication mechanism comprises a fixed seat (71), the lower part of the movable square rod (56) is fixedly connected to the fixed seat (71), the bottom of the fixed seat (71) is provided with a hole groove, both sides of the fixed seat (71) are slidably connected with lifting rods (72), an extrusion spring (73) is connected between the two lifting rods (72) and the fixed seat (71), an extrusion seat (74) is fixedly connected between the bottoms of the two lifting rods (72), a groove is provided in the middle of the extrusion seat (74), and a solid lubricating paste (75) is placed inside the groove of the extrusion seat (74).

5. A device for adjusting the pitch angle of a rain measuring radar according to claim 4, characterized in that: The solid lubricating paste (75) is located inside the groove of the extrusion seat (74) and inside the hole groove of the fixing seat (71).

6. A device for adjusting the pitch angle of a rain measuring radar according to claim 5, characterized in that: Also includes A squeezing mechanism is provided, the squeezing mechanism is arranged on the fixed square guide plate (54), the squeezing mechanism is used to squeeze the lifting rod (72), the squeezing mechanism comprises an extension rod (81), the two sides of the fixed square guide plate (54) are fixedly connected with the extension rods (81), the bottoms of the two extension rods (81) are fixedly connected with fixed squeezing rods (82), the lower sides of the two extension rods (81) are fixedly connected with blocking rods (83), the two sides of the two fixed squeezing rods (82) close to one end of the lifting rod (72) are fixedly connected with fixing bolts (84), the two fixing bolts (84) and the fixed squeezing rods (82) are connected with torsion springs (85), and the two fixed squeezing rods (82) are rotatably connected with squeezing plates (86) at one end close to the lifting rod (72).

7. A pitch angle adjustment device for a rain measuring radar according to claim 6, characterized in that: It also includes a pitch angle calibration rod (9), the upper surface of the fixed square guide plate (54) is provided with a square groove, and the square groove of the fixed square guide plate (54) is fixedly connected to the pitch angle calibration rod (9).

8. A device for adjusting the pitch angle of a rain measuring radar according to claim 7, characterized in that: The pitch angle calibration rod (9) is engraved with pitch angle numbers.