Non-contact detection equipment for pipeline liquid level detection

Abstract

The invention discloses non-contact detection equipment for pipeline liquid level detection, and belongs to the technical field of liquid level sensors, the non-contact detection equipment comprises a liquid level pipe, a guide rail is axially and fixedly arranged on the outer wall of the liquid level pipe, a lead screw is rotatably connected to the guide rail, a driving motor is fixedly arranged at one end of the lead screw, a sliding block is slidably connected to the guide rail in a limiting manner, and the sliding block is in threaded connection with the lead screw; a liquid level sensor is fixedly installed on the sliding block, two rotating wheels are rotationally connected to the sliding block and are arranged in a staggered mode in the longitudinal direction, induction pieces are fixedly connected to the wheel walls of the rotating wheels, the induction pieces abut against the outer wall of the liquid level pipe, and the induction pieces are electrically connected with the liquid level sensor and the driving motor; when the lower sensing piece senses the liquid level and the upper sensing piece does not sense the liquid level, the position is judged to be the liquid level position. According to the invention, by arranging the two induction sheets which are arranged in a staggered manner, when the liquid level is between the two induction sheets, millimeter-level detection is realized, and the detection precision is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of liquid level sensor technology, specifically relating to a non-contact detection device for pipeline liquid level detection. Background Technology

[0002] Nipple watering lines are low-pressure automatic drinking systems widely used in poultry and small mammal farming. In cage-cultured livestock, multiple nipple watering lines are typically used. A pressure regulator is a device specifically designed to control and regulate the water pressure in a nipple watering line. Its application in aquaculture is particularly important because it ensures stable water pressure throughout the entire nipple watering line, a crucial factor in maintaining a stable flow rate. Typically, one pressure regulator is used for each nipple watering line. The pressure regulator has a level display tube, which visually indicates the water pressure of the nipple watering line. Generally, the level range is 0-60 cm, which translates to 0-6 kPa. A detection board fixed to the level display tube on the pressure regulator measures the change in capacitance caused by changes in the level; this change determines the water level.

[0003] Traditional liquid level sensors detect liquid level by measuring the water pressure within a waterline. However, the pressure is high during flushing, presenting a dilemma: a large pressure range prevents accurate level detection, while a small pressure range can damage the sensor's pressure-sensitive resistor during flushing. Existing technologies, such as the non-contact flexible capacitive liquid level sensor disclosed in CN223037209U, measure liquid level by detecting changes in the dielectric ratio between plates caused by liquid level changes, thus altering the capacitance value. Its non-contact characteristic is based on capacitive sensing technology; the sensor is attached to the outer wall of the container, sensing the liquid level without direct contact. As the liquid level changes, the dielectric constant of the capacitor formed by the sensor and the container wall changes accordingly, enabling continuous liquid level monitoring. However, in practical applications, to achieve long-term monitoring, such as… Figure 4 Multiple capacitive sensors 2 need to be fixedly arranged along the axial direction of the liquid level pipe 1 to realize its monitoring function, which increases the cost. In addition, since the capacitive sensors 2 have a certain height, there is a certain height difference between two adjacent capacitive sensors 2. If the capacitive sensor 2 located below detects the liquid level while the capacitive sensor 2 located above does not detect the liquid level, then the liquid level may be at any position at the height of the capacitive sensor 2 located below, resulting in poor detection accuracy.

[0004] Therefore, a non-contact detection device for pipeline liquid level detection is needed to solve the above problems. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a non-contact detection device for pipeline liquid level detection, which solves the problem that the prior art requires multiple capacitive sensors to be continuously arranged along the axial direction of the liquid level pipe, resulting in increased cost and poor detection accuracy.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a non-contact detection device for pipeline liquid level detection, comprising a liquid level tube, a guide rail axially fixedly mounted on the outer wall of the liquid level tube, a lead screw rotatably connected to the guide rail, a drive motor fixedly mounted at one end of the lead screw for driving the lead screw to rotate, a slider slidably connected to the upper limit of the guide rail, the slider being threadedly connected to the lead screw, a liquid level sensor fixedly mounted on the slider, and two rotating wheels rotatably connected to the slider, the two rotating wheels being longitudinally staggered, a sensing plate fixedly connected to the wheel wall of the rotating wheel, the sensing plate abutting against the outer wall of the liquid level tube, and the sensing plate being electrically connected to the liquid level sensor and the drive motor; when both sensing plates detect the liquid level, the drive motor starts to drive the lead screw to rotate, causing the slider to rise; when neither sensing plate detects the liquid level, the drive motor drives the lead screw to rotate in the opposite direction, causing the slider to fall; when the lower sensing plate detects the liquid level and the upper sensing plate does not detect the liquid level, the drive motor shuts off.

[0007] Furthermore, the sensing element is electrically connected to a timing device, which is used to detect the duration of the sensing state of the sensing element. When the duration of the sensing state of the sensing element meets a preset value, the drive motor is triggered to execute a preset action. The preset action includes: when both sensing elements detect the liquid level and the sensing state lasts for 2 seconds, the drive motor starts to drive the lead screw to rotate and make the slider rise; when neither sensing element detects the liquid level and the sensing state lasts for 2 seconds, the drive motor starts to drive the lead screw to rotate in the opposite direction and make the slider fall; when the lower sensing element detects the liquid level and the upper sensing element does not detect the liquid level and the sensing state lasts for 2 seconds, the drive motor stops.

[0008] Furthermore, the timing device incorporates an adaptive delay control module, which dynamically adjusts the state holding time threshold based on historical data of liquid level fluctuations within the pipeline. When the state of the sensor lasts for a period of time When the time is right, the drive motor 302 is triggered to execute a preset action; wherein, the state holding time threshold is... Adaptive calculation based on fluctuation state: In the formula, The base delay time is set to 2 seconds. This is the equipment response weighting factor, with a value ranging from 0.8 to 1.2. This refers to the dynamic delay coefficient; In the formula, This is the maximum delay reference value. , This is the pipeline turbulence correction factor, with a value ranging from 0.1 to 0.5. The fluctuation characteristic value (i.e., the standard deviation of the number of signal jumps of sensor 305 within the current detection cycle); In the formula, To count the number of sampling points within the window, This represents the sensor status code value at the k-th sampling time, where 1 indicates liquid level detected and 0 indicates no liquid level detected. During the window period The mean.

[0009] Furthermore, the adaptive delay control module updates every 10 seconds. The value was adjusted, and the state retention time threshold was recalculated. .

[0010] Furthermore, the slider is provided with two grooves corresponding to the rotating wheel. A mounting block that can slide radially along the liquid level tube is slidably disposed in the groove. The rotating wheel is rotatably connected to the mounting block. A spring is fixedly connected between the mounting block and the inner wall of the groove.

[0011] Furthermore, the slider is provided with two adjustment grooves, and an adjustment block that can slide along the axial direction of the liquid level tube is slidably connected in the adjustment groove. The groove is set on the adjustment block, and an adjustment rod is rotatably connected to the adjustment block. One end of the adjustment rod extends out of the slider and is threadedly connected to the slider.

[0012] Furthermore, the preset gap between the axes of the two rotating wheels along the longitudinal direction is 1 mm.

[0013] Furthermore, the liquid level sensor is equipped with an indicator light. When the lower sensing element detects the liquid level but the upper sensing element does not, the indicator light illuminates; otherwise, the indicator light turns off.

[0014] The beneficial effects of this invention are as follows: This invention achieves millimeter-level detection of liquid level when the liquid level is between two staggered sensing plates. Furthermore, only one liquid level sensor is needed to detect the overall liquid level of the liquid level tube for different heights, reducing costs. Moreover, by placing the sensing plates on the rotating wheel, the connection between the sensing plates and the liquid level tube is made into a line segment, which improves the detection accuracy of the liquid level.

[0015] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 Top view of the slider installation according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the slider structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the liquid level sensor installation structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation of a capacitive sensor in the prior art.

[0017] The following components are labeled in the attached diagram: liquid level tube 1, capacitive sensor 2, guide rail 3, lead screw 301, drive motor 302, slider 303, rotating wheel 304, sensing plate 305, slide groove 306, mounting block 307, spring 308, adjusting groove 309, adjusting block 310, adjusting rod 311, liquid level sensor 4, and indicator light 401. Detailed Implementation

[0018] like Figures 1-3As shown, the present invention provides a non-contact detection device for pipeline liquid level detection, comprising: a liquid level pipe 1, a guide rail 3 axially fixedly disposed on the outer wall of the liquid level pipe 1, a lead screw 301 rotatably connected to the guide rail 3, a drive motor 302 fixedly disposed at one end of the lead screw 301 for driving the lead screw 301 to rotate, a slider 303 slidably connected to the upper limit of the guide rail 3, the slider 303 being configured as an arc shape to cooperate with the liquid level pipe 1, the slider 303 being threadedly connected to the lead screw 301, a liquid level sensor 4 fixedly mounted on the slider 303, the liquid level sensor 4 being a capacitive sensor, and two rotating wheels 304 rotatably connected to the slider 303. The rotating wheel 304 is longitudinally offset, and a sensing plate 305 is fixedly connected to the wheel wall of the rotating wheel 304. The sensing plate 305 abuts against the outer wall of the liquid level tube 1. The sensing plate 305 is electrically connected to the liquid level sensor 4 and the drive motor 302. When both sensing plates 305 sense the liquid level, the drive motor 302 starts to drive the lead screw 301 to rotate so that the slider 303 rises. When neither sensing plate 305 senses the liquid level, the drive motor 302 starts to drive the lead screw 301 to rotate in the opposite direction so that the slider 303 falls. When the lower sensing plate 305 senses the liquid level and the upper sensing plate 305 does not sense the liquid level, the drive motor 302 is turned off.

[0019] In this scheme, the preset gap between the axes of the two rotating wheels 304 along the longitudinal direction is set to 1mm. When the lower sensing plate 305 senses the liquid level and the upper sensing plate 305 does not sense the liquid level, the drive motor 302 is turned off to keep the slider 303 fixed. At this time, the liquid level is within the preset gap between the two rotating wheels 304, realizing millimeter-level liquid level detection. Moreover, for liquid level tubes 1 of different heights, only one liquid level sensor 4 is needed to realize the liquid level detection of the entire liquid level tube 1, reducing costs. Furthermore, by setting the sensing plate 305 on the rotating wheel 304, the connection between the sensing plate 305 and the liquid level tube 1 is in the form of a line segment, which improves the detection accuracy of the liquid level.

[0020] In one embodiment of the present invention, the sensing element is electrically connected to a timing device (not shown in the figure). The timing device is used to detect the duration of the sensing state of the sensing element 305. When the duration of the sensing state of the sensing element 305 meets a preset value, the drive motor 302 is triggered to perform a preset action. The preset action includes: when both sensing elements 305 sense the liquid level and the sensing state duration is 2s, the drive motor 302 is started to drive the lead screw 301 to rotate so that the slider 303 rises; when neither sensing element 305 senses the liquid level and the sensing state duration is 2s, the drive motor 302 is started to drive the lead screw 301 to rotate in the opposite direction so that the slider 303 falls; when the lower sensing element 305 senses the liquid level and the upper sensing element 305 does not sense the liquid level and the sensing state duration is 2s, the drive motor 302 is turned off.

[0021] In this solution, a 2-second sensing duration is set to avoid the impact of liquid level sloshing caused by vibration.

[0022] In one embodiment of the present invention, the timing device has a built-in adaptive delay control module for dynamically adjusting the state holding time threshold based on historical data of liquid level fluctuations in the pipeline. When the state of the sensor lasts for a period of time When the time is right, the drive motor 302 is triggered to execute a preset action; wherein, the state holding time threshold is... Adaptive calculation based on fluctuation state: In the formula, The base delay time is set to 2 seconds. This is the equipment response weighting factor, with a value ranging from 0.8 to 1.2. This refers to the dynamic delay coefficient; In the formula, This is the maximum delay reference value. , This is the pipeline turbulence correction factor, with a value ranging from 0.1 to 0.5. The fluctuation characteristic value (i.e., the standard deviation of the number of signal jumps of sensor 305 within the current detection cycle); In the formula, To count the number of sampling points within the window, This is the sensor status code value for the kth sampling (liquid level detected = 1, liquid level not detected = 0). During the window period The mean.

[0023] In this scheme, a delay mechanism is constructed, and a reference delay time is used when the liquid surface is calm. When the water surface sways due to rising or falling water levels or environmental factors, the state is maintained for a time threshold. As the duration of the sensing state, it solves the problem of false triggering under complex operating conditions caused by traditional fixed delays; through standard deviation It effectively filters out transient interference signals, reducing the false touch rate.

[0024] In one embodiment of the invention, the adaptive delay control module updates every 10 seconds. The value was adjusted, and the state retention time threshold was recalculated. .

[0025] In this solution, the equipment learns the characteristics of the pipeline fluid through a periodic update mechanism, which improves reliability compared to manually preset delay parameters.

[0026] In one embodiment of the present invention, the slider 303 is provided with two grooves 306 corresponding one-to-one with the rotating wheel 304. The grooves 306 are slidably provided with mounting blocks 307 that can slide radially along the liquid level pipe 1. The rotating wheel 304 is rotatably connected to the mounting block 307. A spring 308 is fixedly connected between the mounting block 307 and the inner wall of the groove 306.

[0027] In this solution, the spring 308 ensures that the sensing element 305 is always in contact with the outer wall of the liquid level tube 1, thus preventing improper installation from causing the sensing element 305 to detach from the liquid level tube 1 and thus failing to detect the liquid level.

[0028] In one embodiment of the present invention, the slider 303 is provided with two adjusting grooves 309, and an adjusting block 310 that can slide along the axial direction of the liquid level pipe 1 is slidably connected in the adjusting groove 309. The sliding groove 306 is provided on the adjusting block 310, and an adjusting rod 311 is rotatably connected to the adjusting block 310. One end of the adjusting rod 311 extends out of the slider 303 and is threadedly connected to the slider 303.

[0029] In this scheme, rotating the adjusting rod 311 can drive the adjusting block 310 to move along the axial direction of the liquid level tube 1, so as to adjust the height of the two rotating wheels 304 respectively, thereby adjusting the preset gap between the two rotating wheels 304. The preset gap is adjusted according to different environments. For example, in a stable environment, the preset gap is adjusted to 1mm, and in a vibrating environment, the preset gap is adjusted to 2-3mm. This avoids the liquid level swaying in a vibrating environment from causing the upper and lower sensing plates 305 to continuously sense the liquid level change and causing the slider 303 to be in a continuous reciprocating movement process.

[0030] In one embodiment of the present invention, the liquid level sensor 4 is provided with an indicator light 401. When the lower sensing element 305 senses the liquid level and the upper sensing element 305 does not sense the liquid level, the indicator light 401 lights up; otherwise, the indicator light 401 is off. This facilitates the determination of the liquid level and avoids the difficulty in manually distinguishing whether the slider 303 is in a fixed state due to slight movement of the slider 303.

[0031] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A non-contact detection device for pipeline liquid level detection, comprising a liquid level tube, characterized in that: A guide rail is axially fixed to the outer wall of the liquid level tube. A lead screw is rotatably connected to the guide rail. A drive motor for driving the lead screw to rotate is fixedly installed at one end of the lead screw. A slider is slidably connected to the upper limit of the guide rail. The slider is threadedly connected to the lead screw. A liquid level sensor is fixedly installed on the slider. Two rotating wheels are rotatably connected to the slider. The two rotating wheels are staggered longitudinally. A sensing plate is fixedly connected to the wheel wall of the rotating wheel. The sensing plate abuts against the outer wall of the liquid level tube. The sensing plate is electrically connected to the liquid level sensor and the drive motor. When both sensing plates detect the liquid level, the drive motor starts to drive the lead screw to rotate and make the slider rise. When neither sensing plate detects the liquid level, the drive motor drives the lead screw to rotate in the opposite direction and make the slider fall. When the lower sensing plate detects the liquid level and the upper sensing plate does not detect the liquid level, the drive motor stops.

2. The non-contact detection device for pipeline liquid level detection according to claim 1, characterized in that: The sensing element is electrically connected to a timing device, which is used to detect the duration of the sensing state of the sensing element. When the duration of the sensing state of the sensing element meets a preset value, the drive motor is triggered to execute a preset action. The preset action includes: when both sensing elements detect the liquid level and the sensing state lasts for 2 seconds, the drive motor starts to drive the lead screw to rotate and make the slider rise; when neither sensing element detects the liquid level and the sensing state lasts for 2 seconds, the drive motor starts to drive the lead screw to rotate in the opposite direction and make the slider fall; when the lower sensing element detects the liquid level and the upper sensing element does not detect the liquid level and the sensing state lasts for 2 seconds, the drive motor stops.

3. The non-contact detection device for pipeline liquid level detection according to claim 2, characterized in that: The timing device has a built-in adaptive delay control module, which is used to dynamically adjust the state holding time threshold based on historical data of liquid level fluctuations in the pipeline. When the state of the sensor lasts for a period of time When the time is right, the drive motor 302 is triggered to execute a preset action; wherein, the state holding time threshold is... Adaptive calculation based on fluctuation state: In the formula, The base delay time is set to 2 seconds. This is the equipment response weighting factor, with a value ranging from 0.8 to 1.

2. This refers to the dynamic delay coefficient; In the formula, This is the maximum delay reference value. , This is the pipeline turbulence correction factor, with a value ranging from 0.1 to 0.

5. The fluctuation characteristic value (i.e., the standard deviation of the number of signal jumps of sensor 305 within the current detection cycle); In the formula, To count the number of sampling points within the window, This represents the sensor status code value at the k-th sampling time, where 1 indicates liquid level detected and 0 indicates no liquid level detected. During the window period The mean.

4. The non-contact detection device for pipeline liquid level detection according to claim 3, characterized in that: The adaptive delay control module updates every 10 seconds. The value was adjusted, and the state retention time threshold was recalculated. .

5. The non-contact detection device for pipeline liquid level detection according to claim 1, characterized in that: The slider has two grooves that correspond one-to-one with the rotating wheel. A mounting block that can slide radially along the liquid level pipe is slidably disposed in the groove. The rotating wheel is rotatably connected to the mounting block. A spring is fixedly connected between the mounting block and the inner wall of the groove.

6. The non-contact detection device for pipeline liquid level detection according to claim 5, characterized in that: The slider is provided with two adjustment grooves, and an adjustment block that can slide along the axial direction of the liquid level tube is slidably connected in the adjustment groove. The groove is set on the adjustment block, and an adjustment rod is rotatably connected to the adjustment block. One end of the adjustment rod extends out of the slider and is threadedly connected to the slider.

7. The non-contact detection device for pipeline liquid level detection according to claim 1, characterized in that: The preset longitudinal gap between the axes of the two rotating wheels is 1 mm.

8. The non-contact detection device for pipeline liquid level detection according to claim 1, characterized in that: The liquid level sensor is equipped with an indicator light. The indicator light will illuminate when the lower sensor detects the liquid level and the upper sensor does not. Otherwise, the indicator light will be off.

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