Feeding trough liquid level detection device

Abstract

The invention discloses a feeding trough liquid level detection device which comprises a metal trough body, a metal probe and a detection circuit. According to the technical scheme, the metal probe and the detection circuit are combined to achieve the function of detecting the liquid level position in the metal tank body, different liquid level positions in the metal tank body can cause different potentials at the top end of the metal probe, and the analog-digital converter converts analog potential signals at the top end of the metal probe into digital potential signals; the main controller recognizes the potential of the top end of the metal probe according to the received digital potential signal, and then judges the position relation between the bottom end of the metal probe and the liquid level in the metal tank body according to the potential, the accuracy is high, the misjudgment probability can be effectively reduced, the metal probe does not need to be in a power-on state for a long time in practical application, and the working efficiency is improved. The electrolytic loss of the metal probe can be greatly reduced, and the service life of the metal probe is prolonged.

Description

Technical Field

[0001] The present invention relates to the field of intelligent detection technology, and more particularly to a trough liquid level detection device. Background Art

[0002] In the field of livestock breeding, in order to facilitate operators to feed and water the livestock, it is necessary to install feeding devices in the livestock enclosure to realize intelligent feeding functions.

[0003] In the actual livestock feeding process, feed and water need to be placed in the trough. In order to ensure that the livestock have enough drinking water, it is necessary to ensure that there is enough drinking water in the trough. Therefore, a liquid level detection device is set in the feeding device, and the metal probe in the liquid level detection device is used to detect the liquid level position in the trough. When it is detected that the liquid level in the trough reaches a certain position, the corresponding operation is performed. The existing liquid level detection device is prone to false triggering and is easy to confuse the presence of water with the absence of water. In addition, the existing technology uses metal probes for detection. There is electrolytic loss during detection, which easily causes the service life of the metal probe to be reduced. In actual applications, the metal probe needs to be frequently replaced. Summary of the Invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a trough liquid level detection device.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A food trough liquid level detection device includes a metal trough body, a metal probe and a detection circuit, wherein the metal trough body is electrically connected to the ground terminal, the metal probe is arranged above the metal trough body, the bottom end of the metal probe is arranged in the metal trough body, and the top end of the metal probe is connected to the detection circuit.

[0007] The detection circuit includes a resistor R1, a resistor R2, a capacitor C1, an analog-to-digital converter, a main controller and a reference voltage port. The top of the metal probe is respectively connected to one end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1, the other end of the capacitor C1 is connected to the ground, the other end of the resistor R2 is connected to the input end of the analog-to-digital converter, the other end of the resistor R1 is connected to the reference voltage port, and the output end of the analog-to-digital converter is connected to the main controller.

[0008] As a further improvement of the above technical solution, the detection circuit also includes a self-recovery fuse RA, the top of the metal probe is connected to one end of the self-recovery fuse RA, and the other end of the self-recovery fuse RA is respectively connected to one end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1.

[0009] As a further improvement of the above technical solution, the detection circuit also includes a transient suppression diode D1, the positive electrode of the transient suppression diode D1 is connected to the ground terminal, and the negative electrode of the transient suppression diode D1 is connected to the connection point of the self-recovery fuse RA and the resistor R1.

[0010] As a further improvement of the above technical solution, the analog-to-digital converter is integrated inside the main controller.

[0011] As a further improvement of the above technical solution, the connection point between the resistor R1 and the resistor R2 is defined as a test point, and the main controller includes:

[0012] An input module, configured to receive a digital signal transmitted by the analog-to-digital converter;

[0013] A conversion module, configured to convert the received digital signal into a potential signal of the test point;

[0014] The judging module is used to judge the positional relationship between the bottom end of the metal probe and the liquid level in the metal tank according to the potential signal of the test point.

[0015] As a further improvement of the above technical solution, the potential signal of the test point is defined as the potential to be measured u, the voltage input to the reference voltage port is set as U, the resistance value of the resistor R1 is defined as R1, and the equivalent resistance of the liquid in the metal tank is defined as R 液体 The equivalent resistance when the bottom end of the metal probe is slightly connected to the liquid surface in the metal tank is defined as R 微导通 ;

[0016] In the judgment module, if it is detected that the potential to be measured is u=U, the judgment result is that the bottom end of the metal probe is not in contact with the liquid surface in the metal tank;

[0017] If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe is in contact with the liquid surface in the metal tank;

[0018] If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe is not in contact with the liquid surface in the metal tank in a micro-conductivity state;

[0019] If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe is in contact with the liquid surface in the metal tank body in a micro-conductivity state, where V represents the voltage between the metal probe and the metal tank body when the bottom end of the metal probe is in contact with the liquid surface in the metal tank body in a micro-conductivity state, and R 液体 / / R 微导通 Indicates resistance value is R液体 The equivalent resistance is R 微导通 The resistance of the equivalent resistor when connected in parallel.

[0020] The beneficial effects of the present invention are as follows: the technical solution utilizes the combination of a metal probe and a detection circuit to realize the detection function of the liquid level position in the metal tank body. Different liquid level positions in the metal tank body will cause different potentials at the top of the metal probe. The analog-to-digital converter converts the analog potential signal at the top of the metal probe into a digital potential signal. The main controller identifies the potential of the top of the metal probe based on the received digital potential signal, and then judges the positional relationship between the bottom of the metal probe and the liquid level in the metal tank body based on its potential. The accuracy is high and the probability of misjudgment can be effectively reduced. In actual applications, the metal probe does not need to be in an energized state for a long time, which can greatly reduce the electrolytic loss of the metal probe and increase the service life of the metal probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 This is the equivalent circuit when the bottom end of the metal probe in the present invention is not in contact with the liquid surface in the metal tank;

[0024] Figure 3 This is the equivalent circuit when the bottom end of the metal probe in the present invention contacts the liquid surface in the metal tank;

[0025] Figure 4 This is the equivalent circuit when the bottom end of the metal probe and the liquid surface in the metal tank are not in contact in the micro-conduction state;

[0026] Figure 5 It is an equivalent circuit when the bottom end of the metal probe in the present invention contacts the liquid surface in the metal tank in a micro-conduction state. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figures 1 to 5 The present application discloses a food trough liquid level detection device, a first embodiment of which includes a metal trough body 100, a metal probe 200, and a detection circuit 300. The metal trough body 100 is electrically connected to the ground terminal. The metal probe 200 is arranged above the metal trough body 100, the bottom end of the metal probe 200 is arranged in the metal trough body 100, and the top end of the metal probe 200 is connected to the detection circuit 300.

[0032] The detection circuit 300 includes a resistor R1, a resistor R2, a capacitor C1, an analog-to-digital converter, a main controller and a reference voltage port. The top of the metal probe 200 is respectively connected to one end of the resistor R1, one end of the resistor R2 and one end of the capacitor C1, the other end of the capacitor C1 is connected to the ground, the other end of the resistor R2 is connected to the input end of the analog-to-digital converter, the other end of the resistor R1 is connected to the reference voltage port, and the output end of the analog-to-digital converter is connected to the main controller.

[0033] Specifically, in this embodiment, the metal probe 200 is combined with the detection circuit 300 to realize the detection function of the liquid level position in the metal tank body 100. The different liquid level positions in the metal tank body 100 will cause different potentials at the top of the metal probe 200. The analog-to-digital converter converts the analog potential signal at the top of the metal probe 200 into a digital potential signal. The main controller identifies the potential of the top of the metal probe 200 based on the received digital potential signal, and then judges the positional relationship between the bottom end of the metal probe 200 and the liquid level in the metal tank body 100 based on its potential. The accuracy is high and the probability of misjudgment can be effectively reduced. In actual applications, the metal probe 200 does not need to be in the power-on state for a long time, which can greatly reduce the electrolytic loss of the metal probe 200 and improve the service life of the metal probe 200.

[0034] As a further preferred embodiment, in this embodiment, the detection circuit 300 further includes a resettable fuse RA. The tip of the metal probe 200 is connected to one end of the resettable fuse RA, and the other end of the resettable fuse RA is connected to one end of the resistor R1, one end of the resistor R2, and one end of the capacitor C1, respectively. In this embodiment, the resettable fuse RA improves the safety of the device during use and protects the device from damage due to overcurrent, overload, overheating, or short circuit.

[0035] As a further preferred embodiment, in this embodiment, the detection circuit 300 further includes a transient voltage suppressor (TVS) diode D1. The anode of the TVS diode D1 is connected to ground, and the cathode of the TVS diode D1 is connected to the connection point between the resettable fuse RA and the resistor R1. In this embodiment, the provision of the TVS diode D1 protects the detection circuit 300 from surge pulses, providing rapid overvoltage protection for the detection circuit 300.

[0036] As a further preferred embodiment, in this embodiment, the analog-to-digital converter is integrated into the main controller. This configuration of this embodiment can effectively reduce the circuit structure of the device.

[0037] As a further preferred embodiment, in this embodiment, the connection point between the resistor R1 and the resistor R2 is defined as a test point, and the main controller includes:

[0038] An input module, configured to receive a digital signal transmitted by the analog-to-digital converter;

[0039] A conversion module, configured to convert the received digital signal into a potential signal of the test point;

[0040] The judgment module is used to judge the positional relationship between the bottom end of the metal probe 200 and the liquid level in the metal tank body 100 according to the potential signal of the test point.

[0041] As a further preferred embodiment, in this embodiment, the potential signal of the test point is defined as the potential to be measured u, the voltage input to the reference voltage port is set to U, the resistance value of the resistor R1 is defined as R1, and the equivalent resistance of the liquid in the metal tank body 100 is defined as R 液体 The equivalent resistance when the bottom end of the metal probe 200 and the liquid surface in the metal tank 100 are slightly connected is defined as R 微导通 ;

[0042] In the judgment module, if it is detected that the potential to be measured is u=U, the judgment result is that the bottom end of the metal probe 200 is not in contact with the liquid surface in the metal tank 100;

[0043] If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe 200 is in contact with the liquid surface in the metal tank 100;

[0044] If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe 200 is not in contact with the liquid surface in the metal tank 100 in a slightly conductive state;

[0045] If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe 200 is in contact with the liquid surface in the metal tank body 100 in a micro-conductivity state, where V represents the voltage between the metal probe 200 and the metal tank body 100 when the bottom end of the metal probe 200 is in contact with the liquid surface in the metal tank body 100 in a micro-conductivity state, and R 液体 / / R 微导通 Indicates resistance value is R 液体 The equivalent resistance is R 微导通 The resistance of the equivalent resistor when connected in parallel.

[0046] Specifically, in this embodiment, when the bottom end of the metal probe 200 is not in contact with the liquid surface in the metal tank body 100, that is, there is no electrical connection between the metal probe 200 and the metal tank body 100, the bottom end of the metal probe 200 is disconnected from the ground, so the potential of the test point is u=U; when the bottom end of the metal probe 200 is in contact with the liquid surface in the metal tank body 100, the bottom end of the metal probe 200 is connected to the ground through a resistance of R 液体 The equivalent resistance is connected to the ground, so the potential of the test point is When the bottom end of the metal probe 200 and the liquid level in the metal tank 100 are in a slightly conductive state and are not in contact with each other, the potential to be measured is When the bottom end of the metal probe 200 and the liquid level in the metal tank 100 are in a slightly conductive state and in contact with each other, the potential to be measured is The parameter V is a parasitic parameter caused by the battery effect between the bottom end of the metal probe 200 and the liquid surface in the metal tank 100 when the bottom end of the metal probe 200 and the liquid surface in the metal tank 100 are in a micro-conducting state and in contact with each other. At this time, the resistance between the bottom end of the metal probe 200 and the liquid surface in the metal tank 100 in the equivalent circuit is R 液体 The resistance and resistance value are R 微导通 The resistor is connected in parallel, and then connected in series with a battery with a voltage of V. The negative terminal of the battery with a voltage of V is connected to the ground, and the positive terminal has a resistance of R 液体 The resistance and resistance value are R 微导通 resistor is connected.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A trough liquid level detection device, characterized in that: The invention comprises a metal tank body (100), a metal probe (200) and a detection circuit (300), wherein the metal tank body (100) is electrically connected to the ground terminal, the metal probe (200) is arranged above the metal tank body (100), the bottom end of the metal probe (200) is arranged in the metal tank body (100), and the top end of the metal probe (200) is connected to the detection circuit (300). The detection circuit (300) comprises a resistor R1, a resistor R2, a capacitor C1, an analog-to-digital converter, a main controller, and a reference voltage port; the top end of the metal probe (200) is respectively connected to one end of the resistor R1, one end of the resistor R2, and one end of the capacitor C1; the other end of the capacitor C1 is connected to the ground; the other end of the resistor R2 is connected to the input end of the analog-to-digital converter; the other end of the resistor R1 is connected to the reference voltage port; and the output end of the analog-to-digital converter is connected to the main controller.

2. A trough liquid level detection device according to claim 1, characterized in that: The detection circuit (300) further includes a resettable fuse RA, the top end of the metal probe (200) is connected to one end of the resettable fuse RA, and the other end of the resettable fuse RA is respectively connected to one end of the resistor R1, one end of the resistor R2, and one end of the capacitor C1.

3. A trough liquid level detection device according to claim 2, characterized in that: The detection circuit (300) further comprises a transient suppression diode D1, wherein the positive electrode of the transient suppression diode D1 is connected to the ground terminal, and the negative electrode of the transient suppression diode D1 is connected to the connection point of the self-recovery fuse RA and the resistor R1.

4. The trough liquid level detection device according to claim 1, characterized in that: The analog-to-digital converter is integrated inside the main controller.

5. A trough liquid level detection device according to claim 4, characterized in that: The connection point between the resistor R1 and the resistor R2 is defined as a test point, and the main controller includes: An input module, configured to receive a digital signal transmitted by the analog-to-digital converter; A conversion module, configured to convert the received digital signal into a potential signal of the test point; A judgment module is used to judge the positional relationship between the bottom end of the metal probe (200) and the liquid level in the metal tank body (100) according to the potential signal of the test point.

6. The trough liquid level detection device according to claim 5, characterized in that: The potential signal of the test point is defined as the potential to be measured u, the voltage inputted by the reference voltage port is defined as U, the resistance value of the resistor R1 is defined as R1, and the equivalent resistance of the liquid in the metal tank (100) is defined as R 液体 The equivalent resistance when the bottom end of the metal probe (200) and the liquid surface in the metal tank (100) are slightly connected is defined as R 微导通 ; In the judgment module, if it is detected that the potential to be measured is u=U, the judgment result is that the bottom end of the metal probe (200) is not in contact with the liquid surface in the metal tank (100); If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe (200) is in contact with the liquid surface in the metal tank body (100); If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe (200) is not in contact with the liquid surface in the metal tank (100) in a micro-conductivity state; If the potential to be measured is detected to be The judgment result is that the bottom end of the metal probe (200) is in contact with the liquid surface in the metal tank body (100) in a micro-conductivity state, wherein V represents the voltage between the metal probe (200) and the metal tank body (100) when the bottom end of the metal probe (200) is in contact with the liquid surface in the metal tank body (100) in a micro-conductivity state, and R 液体 / / R 微导通 Indicates resistance value is R 液体 The equivalent resistance is R 微导通 The resistance of the equivalent resistor when connected in parallel.

Images