Underground water level observation instrument

Abstract

The utility model provides an underground water level observation instrument which comprises a support and an ultrasonic range finder, a roller is installed on the top of the support, a cable is wound on the roller, the first end of the cable is connected with a signal processing and control unit, the second end of the cable is connected with the ultrasonic range finder, and a rotating shaft of the roller is connected with an output shaft of a servo motor. The servo motor is connected with the signal processing and control unit, in the working process, the servo motor drives the roller to rotate forwards or reversely so that the cable can be unwound and wound, and the signal processing and control unit can record the number of rotation turns of the servo motor. The signal processing and control unit can record the number of reverse rotation turns of the servo motor, and when the number of reverse rotation turns of the servo motor is close to the number of forward rotation turns when the servo motor releases a cable, the signal processing and control unit controls the servo motor to slow down the rotation speed, so that damage caused by collision due to too fast recovery of the ultrasonic range finder is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogeological survey, in particular to an underground water level observation instrument. Background Art

[0002] Hydrology refers to various phenomena such as the changes and movements of water in nature. Hydrology now generally refers to a discipline that studies the temporal and spatial distribution and changing patterns of water in nature. In the process of reservoir hydrological monitoring, groundwater level observation instruments are sometimes used to measure the depth of water bodies.

[0003] The publication number authorized by China is CN218211500U, and the name is a patent for an underground water level observation instrument. The device includes a disc, a cylinder is evenly fixedly installed under the disc, one end of the cylinder is slidably connected to a telescopic sleeve, a first telescopic column is evenly arranged on one side of the cylinder, and a fixing plate is evenly fixedly installed on the upper surface of the disc, which is connected to the box body by a first electric telescopic rod. When the first round roller rotates to retract and release the cable, the box body is raised and lowered to observe the water level. During the lifting process, the box body uses the first electric telescopic rod to limit the box body, which can make the box body fall vertically, thereby improving the accuracy of water level observation and preventing the observation instrument from tilting under the impact of waves. By arranging the first electric telescopic rods around the observation instrument Two round rollers, the second round roller is rotated to make the blades on the surface cut the aquatic plants and debris around the observation instrument body, so that the observation instrument can fall smoothly, and avoid the observation instrument being entangled by the aquatic plants and getting stuck. Although the above device can make the observation instrument fall smoothly and avoid the observation instrument being entangled by the aquatic plants and getting stuck, there are still some problems when using the device: 1. The device judges the water level by observing the elongated length of the cable. When the water flow in the water body is faster, the cable is easily bent, resulting in inaccurate detection results; 2. The device does not have a motor speed control mechanism. When the device retracts the cable, if the motor speed is slow, the recovery speed is slow. If the motor speed is fast, the detection mechanism may collide, resulting in equipment damage. Utility Model Content

[0004] The purpose of the utility model is to provide an underground water level observation instrument, which monitors the number of revolutions of the servo motor through signal processing and control unit, and then adjusts the speed of the servo motor through the number of revolutions of the servo motor when the ultrasonic rangefinder is recovered, thereby avoiding the collision problem caused by the excessive speed of the recovery cable. In order to achieve the above technical features, the purpose of the utility model is achieved as follows:

[0005] A groundwater level observation instrument comprises a bracket and an ultrasonic rangefinder, wherein a drum is mounted on the top of the bracket, a cable is wound around the drum, a first end of the cable is connected to a signal processing and control unit, a second end of the cable is connected to the ultrasonic rangefinder, a rotating shaft of the drum is connected to an output shaft of a servo motor, the servo motor is connected to the signal processing and control unit, and the ultrasonic rangefinder is connected to an anti-roll mechanism.

[0006] The anti-roll mechanism includes a vertical rod installed at the bottom of the ultrasonic rangefinder, a fixed ring is fixedly installed on the outer side of the vertical rod, the outer wall of the fixed ring is movably connected to the inner wall of the movable ring through a first rotating shaft, the outer wall of the movable ring is movably connected to the support frame through a second rotating shaft, the axis of the first rotating shaft is perpendicular to the axis of the second rotating shaft, and a counterweight is installed on the end of the vertical rod away from the ultrasonic rangefinder.

[0007] The bracket is installed on the top of the box-type base, the signal processing and control unit is installed inside the box-type base, and a display and control input module connected to the signal processing and control unit is installed on the outside of the box-type base.

[0008] The vertical rod, the fixed ring, the first rotating shaft, the movable ring, the second rotating shaft, and the counterweight are all made of stainless steel.

[0009] The utility model has the following beneficial effects:

[0010] 1. The servo motor drives the drum to rotate forward or reverse to realize cable release and recovery. The signal processing and control unit records the number of rotations of the servo motor. When the cable is recovered, the signal processing and control unit records the number of reverse rotations of the servo motor. When the number of reverse rotations of the servo motor is close to the number of forward rotations of the servo motor when releasing the cable, the signal processing and control unit controls the servo motor to slow down the rotation speed, thereby avoiding the ultrasonic rangefinder from being damaged by collision due to excessive recovery when retrieving the cable.

[0011] 2. Through the setting of the anti-roll mechanism, universal rotation can be achieved between the vertical rod and the support frame. Therefore, when the support frame is in a non-erect state, the vertical rod can also remain vertical under the action of the gravity of the counterweight, so that the ultrasonic rangefinder is set vertically upward, avoiding the problem of excessive error in the detection result due to the tilt of the ultrasonic rangefinder, and the detection accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 A schematic diagram of the structure of a groundwater level observation instrument provided by an embodiment of the utility model;

[0014] Figure 2 A schematic diagram of the connection structure between the anti-roll mechanism and the ultrasonic rangefinder provided in an embodiment of the utility model;

[0015] Figure 3 A schematic diagram of the structure of the anti-roll mechanism provided in an embodiment of the utility model;

[0016] In the figure: bracket 1, ultrasonic rangefinder 2, roller 3, cable 4, servo motor 5, vertical rod 6a, fixed ring 6b, first rotating shaft 6c, movable ring 6d, second rotating shaft 6e, counterweight 6f, support frame 7, box base 8, display and control input module 9, power cord 10, plug 11. DETAILED DESCRIPTION

[0017] The embodiments of the present utility model are further described below in conjunction with the accompanying drawings.

[0018] See attached Figure 1-3 In order to realize the above technical features, the purpose of the utility model is achieved as follows:

[0019] A groundwater level observation instrument comprises a bracket 1 and an ultrasonic rangefinder 2. A drum 3 is mounted on the top of the bracket 1. A cable 4 is wound around the drum 3. The first end of the cable 4 is connected to a signal processing and control unit. The second end of the cable 4 is connected to the ultrasonic rangefinder 2. The rotating shaft of the drum 3 is connected to the output shaft of a servo motor 5. The servo motor 5 is connected to the signal processing and control unit. The ultrasonic rangefinder 2 is connected to an anti-roll mechanism. The anti-roll mechanism is used to ensure that the ultrasonic rangefinder 2 always maintains a vertical upward state. The signal processing and control unit comprises a counter connected to the servo motor 5, a controller, a circuit board, a comparison The computing components and control components such as operational amplifiers and processors, when working, the servo motor 5 drives the drum 3 to rotate forward or reverse to realize the release and recovery of the cable 4. The signal processing and control unit can record the number of rotations of the servo motor 5. When the cable 4 is recovered, the signal processing and control unit will record the number of reverse rotations of the servo motor 5. When the number of reverse rotations of the servo motor 5 is close to the number of forward rotations of the servo motor 5 when the cable 4 is released, the signal processing and control unit controls the servo motor 5 to slow down the rotation speed, thereby avoiding the ultrasonic rangefinder 2 from being recovered too quickly and causing collision and damage during the line retraction.

[0020] Furthermore, the anti-roll mechanism includes a vertical rod 6a installed at the bottom of the ultrasonic rangefinder 2, a fixed ring 6b is fixedly installed on the outer side of the vertical rod 6a, the outer wall of the fixed ring 6b is movably connected to the inner wall of the movable ring 6d through the first rotating shaft 6c, the outer wall of the movable ring 6d is movably connected to the support frame 7 through the second rotating shaft 6e, the axis of the first rotating shaft 6c is perpendicular to the axis of the second rotating shaft 6e, and a counterweight 6f is installed on the end of the vertical rod 6a away from the ultrasonic rangefinder 2. Through the arrangement of the above-mentioned mechanism, universal rotation can be achieved between the vertical rod 6a and the support frame 7. Therefore, when the support frame 7 is in a non-erect state, the vertical rod 6a can also remain vertical under the action of the gravity of the counterweight 6f, so that the ultrasonic rangefinder 2 can be arranged upward perpendicular to the water surface, avoiding the problem of excessive error in the detection result due to the tilt of the ultrasonic rangefinder 2, and the detection accuracy is high.

[0021] Furthermore, the bracket 1 is installed on the top of the box-type base 8, the signal processing and control unit is installed inside the box-type base 8, and a display and control input module 9 connected to the signal processing and control unit is installed on the outside of the box-type base 8.

[0022] Furthermore, the vertical rod 6a, the fixed ring 6b, the first rotating shaft 6c, the movable ring 6d, the second rotating shaft 6e, and the counterweight 6f are all made of stainless steel to delay surface corrosion and ensure the working stability of the anti-roll mechanism.

[0023] Furthermore, a power connection assembly is provided on one side of the box-type base 8, and the power connection assembly includes a power cord 10 and a plug 11. The groundwater level observation instrument of the present application is connected to an external power source via the power connection assembly.

[0024] Working principle of this utility model:

[0025] When using the groundwater level observation instrument, firstly, the ultrasonic rangefinder 2 and the anti-roll mechanism are put into the water, and by inputting instructions to the signal processing and control unit on the display and control input module 9, the servo motor 5 is controlled to rotate forward to release the cable 4 until the anti-roll mechanism sinks to the bottom. Through the setting of the above-mentioned mechanism, the vertical rod 6a and the support frame 7 can achieve universal rotation, so that the ultrasonic rangefinder 2 is kept vertically arranged upward on the water surface. Then, the ultrasonic rangefinder 2 is started to detect the water level depth, and the signal is transmitted to the signal processing and control unit through the cable 4, and displayed by the display and control input module 9. After the detection work is completed, when the cable 4 is retracted, the signal processing and control unit controls the servo motor 5 to reverse, and records the number of reverse turns of the servo motor 5. When the number of reverse turns of the servo motor 5 is close to the number of forward turns of the servo motor 5 when the cable 4 is released, the signal processing and control unit controls the servo motor 5 to slow down the rotation speed, thereby avoiding the problem of collision of the ultrasonic rangefinder 2 caused by retracting too fast.

Claims

1. An underground water level observation instrument, comprising a bracket (1) and an ultrasonic rangefinder (2), wherein a roller (3) is mounted on the top of the bracket (1), and a cable (4) is wound around the roller (3), characterized in that: The first end of the cable (4) is connected to the signal processing and control unit, the second end of the cable (4) is connected to the ultrasonic rangefinder (2), the rotating shaft of the roller (3) is connected to the output shaft of the servo motor (5), the servo motor (5) is connected to the signal processing and control unit, and the ultrasonic rangefinder (2) is connected to the anti-roll mechanism.

2. The underground water level observation instrument according to claim 1, characterized in that: The anti-roll mechanism comprises a vertical rod (6a) mounted on the bottom of the ultrasonic rangefinder (2); a fixed ring (6b) is fixedly mounted on the outer side of the vertical rod (6a); the outer wall of the fixed ring (6b) is movably connected to the inner wall of a movable ring (6d) via a first rotating shaft (6c); the outer wall of the movable ring (6d) is movably connected to a support frame (7) via a second rotating shaft (6e); the axis of the first rotating shaft (6c) is perpendicular to the axis of the second rotating shaft (6e); and a counterweight (6f) is mounted on the end of the vertical rod (6a) away from the ultrasonic rangefinder (2).

3. The underground water level observation instrument according to claim 2, characterized in that: The bracket (1) is mounted on the top of a box-type base (8), the signal processing and control unit is mounted inside the box-type base (8), and a display and control input module (9) connected to the signal processing and control unit is mounted on the outside of the box-type base (8).

4. The underground water level observation instrument according to claim 3, characterized in that: The vertical rod (6a), the fixed ring (6b), the first rotating shaft (6c), the movable ring (6d), the second rotating shaft (6e), and the counterweight (6f) are all made of stainless steel.

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