Liquid density automatic detection device

Abstract

The utility model discloses a liquid density automatic detection device, and relates to the technical field of liquid density measurement, the automatic detection device comprises a detection device body, and the detection device body comprises a first detection assembly and a second detection assembly; each of the first detection assembly and the second detection assembly is provided with a pressure measuring pipe and a pressure measuring piece, each pressure measuring pipe comprises a transverse connecting section and a vertical pressure measuring section which are in smooth connection and are vertically arranged, and each pressure measuring piece is arranged at a port of the corresponding vertical pressure measuring section; when the detection device body is connected with a container containing to-be-detected liquid, the transverse connecting section is communicated with the interior of the container, so that the to-be-detected liquid flows into the pressure measuring pipe, the pressure measuring piece is used for collecting a pressure value generated in the vertical pressure measuring section, and then the to-be-detected liquid is detected according to the height difference between the first detection assembly and the second detection assembly and the pressure values collected by the first detection assembly and the second detection assembly. The liquid density of the to-be-measured liquid is obtained. The device is simple in structure and high in universality, the corresponding sensor is separated from a measured medium during use, and the pollution problem of the sensor is effectively solved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of liquid density measurement, in particular to a liquid density automatic detection device. BACKGROUND

[0002] The existing density measurement devices can be roughly divided into three types: differential pressure density meter, pipe density meter and tuning fork density meter.

[0003] Although the measurement methods are different, the common point is that they all need to be in direct contact with the measured medium to carry out the measurement.

[0004] Based on the above measurement form, when measuring some fluids containing particulate matter that is prone to sedimentation or has coagulation characteristics, the accumulation of particulate matter or the crystallization and coagulation of the measured medium can easily have a serious impact on the measurement accuracy of the sensor. To solve the above problems, we propose a liquid density automatic detection device. CONTENT OF THE INVENTION

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide a liquid density automatic detection device. In a first aspect, the present application provides a liquid density automatic detection device, comprising:

[0006] The detection device body comprises a first detection assembly and a second detection assembly arranged from top to bottom along a first direction;

[0007] The first detection assembly and the second detection assembly both have a pressure measuring tube and a pressure measuring piece, the pressure measuring tube comprises a horizontal connecting section and a vertical pressure measuring section which are connected smoothly and arranged vertically, and the pressure measuring piece is arranged at the port of the vertical pressure measuring section;

[0008] When the detection device body is connected with a container containing the liquid to be measured, the horizontal connecting section is in communication with the inside of the container, so that the liquid to be measured flows into the inside of the pressure measuring tube;

[0009] The pressure measuring piece is used to collect the pressure generated by compressed air between the liquid surface of the liquid to be measured flowing into the inside of the pressure measuring tube and the bottom of the corresponding pressure measuring piece, and then the liquid density of the liquid to be measured is obtained through the height difference between the first detection assembly and the second detection assembly and the pressure values collected by each of them.

[0010] According to the technical scheme provided by the present application, the detection device body further comprises a displacement measuring piece arranged between the first detection assembly and the second detection assembly for measuring the height difference between the first detection assembly and the second detection assembly; the displacement measuring piece is of a pull rope type structure; and the active end of the pull rope of the displacement measuring piece is fixedly connected with the horizontal connecting section of the second detection assembly.

[0011] According to the technical scheme provided in the application, the first detection assembly and the second detection assembly are movably connected with the connecting piece outside the port of the transverse connecting section, and the connecting piece is used for connecting the first detection assembly and the second detection assembly with the two measuring interfaces of the outer side wall of the container.

[0012] According to the technical scheme provided in the application, the detection device body further comprises a signal processing assembly.

[0013] The signal processing assembly comprises an outer housing, and the first detection assembly is fixedly arranged on the top of the outer housing; and the signal processing assembly is used for calculating the liquid density of the liquid to be measured.

[0014] According to the technical scheme provided in the application, the two pressure measuring pieces and the displacement measuring piece are respectively connected with the signal processing assembly through signal lines, and the signal lines are used for realizing data communication among the pressure measuring pieces, the displacement measuring piece and the signal processing assembly.

[0015] According to the technical scheme provided in the application, the signal processing assembly further comprises a power supply module and a controller arranged in the outer housing; and the power supply module is used for supplying power to the controller, the pressure measuring pieces and the displacement measuring piece.

[0016] The controller is signal connected with the two pressure measuring pieces and the displacement measuring piece, and is used for receiving and processing the pressure signals and the displacement signals generated by the pressure measuring pieces and the displacement measuring piece, so as to calculate the liquid density of the liquid to be measured.

[0017] According to the technical scheme provided in the application, the signal processing assembly further comprises at least three signal lamps arranged on the top of the outer housing, the three signal lamps have light emitting bodies with different colors, and are used for indicating the working state of the detection device body; and the working state at least comprises a charging state, a fault state and a running state.

[0018] According to the technical scheme provided in the application, the detection device body further comprises a display, and the display is signal connected with the signal processing assembly, and is used for presenting the pressure value, the height difference and the liquid density on the interface of the display.

[0019] In summary, the technical scheme specifically discloses a liquid density automatic detection device, which comprises a detection device body, wherein the detection device body comprises a first detection assembly and a second detection assembly arranged from top to bottom along a first direction; the first detection assembly and the second detection assembly are both provided with a pressure measuring pipe and a pressure measuring piece; the pressure measuring pipe comprises a horizontal connecting section and a vertical pressure measuring section which are connected smoothly and arranged vertically; the pressure measuring piece is arranged at a port of the vertical pressure measuring section; when the detection device body is connected with a container containing a to-be-detected liquid, the horizontal connecting section is in communication with the inside of the container, so that the to-be-detected liquid flows into the inside of the pressure measuring pipe; the pressure measuring piece is used for collecting the pressure generated by compressed air between the liquid surface of the to-be-detected liquid flowing into the inside of the pressure measuring pipe and the bottom of the corresponding pressure measuring piece, and then the liquid density of the to-be-detected liquid is obtained through the height difference between the first detection assembly and the second detection assembly and the pressure values collected by the first detection assembly and the second detection assembly.

[0020] At present, when some fluids containing particulate matter are measured, the accumulation of the particulate matter or the crystallization and solidification of the measured medium can seriously affect the measurement accuracy of the sensor, and in the present application, the first detection assembly and the second detection assembly are arranged in cooperation to collect the pressure of the to-be-detected liquid without contact, and then the height difference between the first detection assembly and the second detection assembly is combined to calculate the liquid density, so that the device has simple structure, strong universality and can ensure that the corresponding sensor is separated from the measured medium, thereby solving the pollution problem of the sensor. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other characteristics, objects and advantages of the present application will become more apparent from the following detailed description of non-restrictive embodiments made with reference to the accompanying drawings:

[0022] Figure 1 It is a structural schematic view of a liquid density automatic detection device.

[0023] Figure 2 It is a front view of a liquid density automatic detection device.

[0024] Figure 3 It is an enlarged schematic view of a first detection assembly.

[0025] Figure 4 It is an enlarged schematic view of a second detection assembly.

[0026] Figure 5 It is a working condition schematic view of a pressure measuring piece collecting pressure.

[0027] Figure 6 It is a principle schematic view of a signal processing assembly.

[0028] The following are the labels in the diagram: 1. Detection device body; 2. First detection component; 3. Second detection component; 4. Pressure measuring tube; 5. Pressure measuring element; 6. Displacement measuring element; 7. Connecting element; 8. Signal processing component; 81. Housing; 82. Power supply module; 83. Controller; 84. Indicator light; 9. Signal line; 10. Display. Detailed Implementation

[0029] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] To make the technical solutions of the embodiments of this application clearer and easier to understand, the application background of the embodiments of this application is introduced below.

[0033] Existing density measuring devices can be broadly classified into three categories: differential pressure density meters, tube density meters, and tuning fork density meters.

[0034] Although the measurement methods differ, they all share the common requirement of direct contact with the measured medium. When measuring fluids containing particulate matter that are prone to sedimentation or exhibiting solidification characteristics, the accumulation of particles or the crystallization and solidification of the measured medium can severely impact the sensor's measurement accuracy. A typical example is the following problem encountered when measuring the density of cement slurry in the storage tanks of a pulping plant:

[0035] (1) Zero drift

[0036] Cement in cement slurry crystallizes very easily, while the slurry storage tank operates intermittently. During the interval between two full fillings of the storage tank, cement slurry easily crystallizes on the sensor surface, causing the density meter's zero point to drift and making it impossible to continuously and accurately measure the slurry density. Moreover, the start-up time of the slurry preparation station is affected by the construction progress at the work site, sometimes with waiting times of several hours or even days. If the deposits on the density meter are not cleaned in time, the density meter may become unusable.

[0037] (2) Easily worn

[0038] Existing densitometers are prone to diaphragm wear during contact with flowing cement slurry, which can damage the densitometer sensor.

[0039] (3) Difficult to clean

[0040] Once the cement slurry is crystallized and solidified on the existing density meter, it will be difficult to completely remove, especially for the side wall mounted and straight tube density meter, and the tuning fork density meter is more difficult to clean than the former two due to the fragility of its own structure.

[0041] (4) Poor structural flexibility

[0042] The side wall mounted and straight tube density meter belongs to fixed equipment, which needs to be customized according to the demand, and has long construction period and poor structural flexibility.

[0043] Therefore, the embodiments of the present application aim to provide a density measuring device with flexible structure and separated sensor and measured medium, so as to solve the problems of sensor pollution and poor structural flexibility, and improve the universality, durability and reliability of the sensor. Specifically, please refer to Figure 1 The embodiment shown in the structural schematic diagram of the liquid density automatic detection device provided by the present embodiment comprises:

[0044] The detection device body 1 comprises a first detection assembly 2 and a second detection assembly 3 arranged from top to bottom along a first direction;

[0045] Both the first detection assembly 2 and the second detection assembly 3 have a pressure measuring tube 4 and a pressure measuring piece 5, the pressure measuring tube 4 comprises a horizontal connecting section 41 and a vertical pressure measuring section 42 which are connected smoothly and arranged vertically, and the pressure measuring piece 5 is arranged at the port of the vertical pressure measuring section 42;

[0046] When the detection device body 1 is connected with a container containing the liquid to be measured, the horizontal connecting section 41 is in communication with the inside of the container, so that the liquid to be measured flows into the inside of the pressure measuring tube 4;

[0047] The pressure measuring piece 5 is used to collect the pressure generated by compressed air between the liquid surface of the liquid to be measured flowing into the inside of the pressure measuring tube 4 and the bottom of the corresponding pressure measuring piece 5, and then the liquid density of the liquid to be measured is obtained through the height difference between the first detection assembly 2 and the second detection assembly 3 and the pressure values collected by each of them.

[0048] In the present application, please refer to Figure 2 The detection device body 1 comprises a first detection assembly 2 and a second detection assembly 3 arranged from top to bottom along a first direction, wherein the first direction is a vertical direction; when the detection device body 1 is connected with a container containing the liquid to be measured, the first detection assembly 2 and the second detection assembly 3 are arranged vertically on the side wall of the container; generally, the pressure measuring piece 5 can be selected as a pressure sensor.

[0049] Specifically, please refer to Figure 5, the first detection assembly 2 and the second detection assembly 3 cooperate with each other and have consistent pressure measurement principles; in structure, the first detection assembly 2 and the second detection assembly 3 both include a pressure measuring pipe 4 and a pressure measuring piece 5, the pressure measuring pipe 4 is in communication with the inside of the container, then the to-be-measured liquid will flow into the pressure measuring pipe 4, with the liquid level of the to-be-measured liquid rising in the pressure measuring pipe 4, the air between the liquid level and the pressure measuring piece 5 will also be compressed, so that the liquid level cannot continue to rise and contact the bottom of the pressure measuring piece 5, and the pressure measurement is not affected, thereby realizing the pressure measurement of the pressure measuring piece 5 and the to-be-measured liquid without contact.

[0050] It should be explained that the use scene of the detection device body 1 in the embodiment of the application is not limited to liquid density detection, but also other media, and in order to realize the above pressure measurement process, referring to Figure 1 、 Figure 2 or Figure 5 , the structure of the pressure measuring pipe 4 is composed of a horizontal connecting section 41 and a vertical pressure measuring section 42 which are smoothly connected and vertically arranged, the to-be-measured liquid flows in the horizontal connecting section 41, and the liquid level at the vertical pressure measuring section 42 forms a compressed air area between the bottom of the pressure measuring piece 5, thereby generating a pressure that can be collected by the pressure measuring piece 5.

[0051] Further, since the liquid level height of the to-be-measured liquid in the container is higher than the first detection assembly during the measurement of the density of the to-be-measured liquid, the first detection assembly 2 and the second detection assembly 3 both have medium flowing in, and then two pressure values P1 and P2 are obtained, and the height difference H between the first detection assembly 2 and the second detection assembly 3 is measured, so that the liquid density of the to-be-measured liquid can be calculated according to the formula: liquid density ρ = (P2-P1) / (g×H), and the gravitational acceleration g is taken.

[0052] In a preferred embodiment, referring to Figure 1 , the detection device body 1 further includes a displacement measuring piece 6, the displacement measuring piece 6 is arranged between the first detection assembly 2 and the second detection assembly 3, and is used for measuring the height difference between the first detection assembly 2 and the second detection assembly 3.

[0053] The displacement measuring piece 6 is in a pull rope structure; the active end of the pull rope of the displacement measuring piece 6 is fixedly connected with the horizontal connecting section 41 of the second detection assembly 3.

[0054] Specifically, based on the foregoing, it can be known that the height difference H between the first detection assembly 2 and the second detection assembly 3 also needs to be calculated when calculating the liquid density p, so the detection device body 1 further comprises a displacement measuring element 6. Here, the displacement measuring element 6 is a pull rope type displacement sensor structure, so that the relative distance between the first detection assembly 2 and the second detection assembly 3 can be adjusted as needed, and the height difference measurement is more convenient and fast, so the structure of the detection device body 1 in the embodiment is more flexible, and can adapt to the detection scene of the liquid to be measured in containers of various specifications.

[0055] It needs to be explained that the displacement measuring element 6 can be arranged in the signal processing assembly 8, or can be arranged at the first detection assembly 2, and the movable end of the pull rope is fixedly connected with the transverse connecting section 41 of the second detection assembly 3. Since the displacement measuring element 6 essentially measures the height difference between the sensing surfaces of the first detection assembly 2 and the second detection assembly 3, when the movable end of the pull rope is fixedly connected with the transverse connecting section 41 of the second detection assembly 3, the height difference collected by the displacement measuring element 6 is the distance between the transverse connecting section 41 of the first detection assembly 2 and the transverse connecting section 41 of the second detection assembly 3. However, the specific data needs to be analyzed in combination with the actual situation, which is not specially limited here.

[0056] In a preferred embodiment, referring to Figures 1-5 , the ports of the transverse connecting sections 41 included in the first detection assembly 2 and the second detection assembly 3 are movably connected with connecting elements 7 outside the ports, and the connecting elements 7 are used to connect the first detection assembly 2 and the second detection assembly 3 with two measurement interfaces on the outer wall of the container.

[0057] The first detection assembly 2 and the second detection assembly 3 are detachably connected with the container, so that the detection device body 1 can be used multiple times. The first detection assembly 2 and the second detection assembly 3 are connected with the container by the connecting elements 7 outside the respective transverse connecting sections 41. Here, the connecting element 7 can be a simple nut structure, and a thread corresponding to the nut needs to be arranged outside the corresponding measurement interface, which will not be described here. The form of the connecting element 7 can also be other clamping structures.

[0058] Among them, after the first detection assembly 2 and the second detection assembly 3 are installed on the container, the vertical pressure measuring section 42 should always be perpendicular to the ground, and the transverse connecting section 41 is perpendicular to the outer wall of the container. Taking a lock nut as an example, the nut is a movable nut, at this time, only the nut and the measurement interface matched with the outer wall of the container need to be tightened.

[0059] In a preferred embodiment, referring to Figure 1 , Figure 2 and Figure 6 , the detection device body 1 further comprises a signal processing assembly 8.

[0060] The signal processing assembly 8 comprises an outer shell 81, and the first detection assembly 2 is fixedly arranged on the top of the outer shell 81; the signal processing assembly 8 is used for calculating the liquid density of the liquid to be detected.

[0061] Specifically, the outer shell 81 is an explosion-proof shell, which can prevent dust and water, and is used for protecting internal components; a door and a charging port are arranged on the outer shell, so that the battery can be replaced by opening the door, and the in-situ charging can be performed by connecting a charger; in addition, the outer shell 81 and the first detection assembly 2 on the top can be directly welded together, without additional fixation.

[0062] Further, referring to Figure 3 and Figure 4 , the two pressure measuring members 5 and the displacement measuring member 6 are connected with the signal processing assembly 8 through signal lines 9, and the signal lines 9 are used for realizing data communication among the pressure measuring members 5, the displacement measuring member 6 and the signal processing assembly 8, so that the signal processing assembly 8 can obtain the values collected by the sensors through signal communication with the sensors, and then perform the final liquid density calculation.

[0063] In a preferred embodiment, referring to Figure 3 , the signal processing assembly 8 further comprises a power supply module 82 and a controller 83 arranged in the outer shell 81; the power supply module 82 is used for supplying power to the controller 83, the pressure measuring members 5 and the displacement measuring member 6;

[0064] The controller 83 is signal-connected with the two pressure measuring members 5 and the displacement measuring member 6, and is used for receiving and processing the pressure signals and the displacement signals generated by the pressure measuring members 5 and the displacement measuring member 6, so as to calculate the liquid density of the liquid to be detected.

[0065] Specifically, the controller 83 is a circuit board developed based on a single-chip microcomputer, which has the functions of data collection, operation, wireless output and wired output, and can collect two-way pressure signals and one-way displacement sensor signals and perform calculation at the same time; the main body of the power supply module 82 is a 24V lithium battery pack, and of course, it can also be powered by an external 24V DC power supply; when the battery pack needs to be charged, an external charger also needs to be connected for charging.

[0066] In a preferred embodiment, referring to Figure 3 , the signal processing assembly 8 further comprises at least three signal lamps 84 arranged on the top of the outer shell 81, the three signal lamps 84 have light-emitting bodies with different colors, and are used for indicating the working state of the detection device body 1; the working state at least includes a charging state, a fault state and a running state.

[0067] Specifically, the three signal lights 84 can be red, yellow and green LED lights, which are connected with the controller 83, and then indicate the working state of the detection device body 1 or the signal processing assembly 8; for example, the red signal light indicates that the voltage of the battery pack is low, and the battery needs to be replaced or charged in time; the yellow signal light indicates a fault; and the green signal light indicates that the detection device body 1 is working.

[0068] In a preferred embodiment, referring to Figure 2 The detection device body 1 further comprises a display 10, which is signal connected with the signal processing assembly 8, and is used to present the pressure value, the height difference and the liquid density on the interface of the display 10.

[0069] Specifically, after the controller 83 collects the current pressure signals P2, P1 and the height signal H, the density value of the current liquid to be measured is calculated as follows: ρ = (P2-P1) / (g×H), and then the signals P2, P1, H and the calculated density value are displayed on the large screen of the display 10 through the display output line of the controller 83; if wireless transmission is required, a SIM card needs to be inserted into the controller 83; in addition, the controller 83 is also reserved with a USB interface, which can be connected to an upper computer through a cable for wired data transmission.

[0070] Based on the above description, the application provides an automatic liquid density detection device, and the working principle is as follows:

[0071] After the container to be measured is confirmed, the detection device body 1 and the container to be measured can be connected by directly tightening the two measuring interfaces on the outer wall of the container through the connecting pieces (nuts) arranged on the first detection assembly 2 and the second detection assembly 3; then, the liquid to be measured is added to the container to be measured, and the volume of the liquid to be measured is ensured to be sufficient, so that the pressure tubes 4 in the first detection assembly 2 and the second detection assembly 3 are both filled with the liquid to be measured; the pressure values collected by the two pressure measuring pieces 5 are obtained through the controller 83 in the signal processing assembly 8; then, the displacement values obtained by the controller 83 after the displacement measuring pieces 6 are stretched after the first detection assembly 2 and the second detection assembly 3 are connected with the container are combined, and the liquid density of the liquid to be measured is calculated.

[0072] The device has the following advantages: 1. The device can measure the pressure and density of various normal-temperature fluids, and the measurement accuracy does not change over a long period of time, the measurement medium is not left, and the device does not need to be cleaned during normal use, which reduces the requirement for the on-site operator and improves the use reliability; 2. The installation structure of the device is flexible, and various height differences can be installed without customization; and 3. The device is powered by a battery, the installation is convenient, the signal can be transmitted in a wired or wireless manner, and the information collection is convenient and flexible.

[0073] The above description is only the preferred embodiment of the present application and the explanation of the technical principles. It should be understood by those skilled in the art that the scope of the protection of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features. It should also cover other technical solutions formed by the combinations of the above technical features or their equivalent features without departing from the concept of the present application. For example, the technical solutions formed by the mutual replacements of the above features and the technical features disclosed in the present application (but not limited to) with similar functions.

Claims

1. A liquid density automatic detection device, characterized by, The application relates to a detection device body (1) which comprises a first detection assembly (2) and a second detection assembly (3) arranged in a first direction from top to bottom. The first detection assembly (2) and the second detection assembly (3) each have a pressure measuring pipe (4) and a pressure measuring piece (5), the pressure measuring pipe (4) comprises a horizontal connecting section (41) and a vertical pressure measuring section (42) which are connected smoothly and arranged vertically, and the pressure measuring piece (5) is arranged at the port of the vertical pressure measuring section (42). When the detection device body (1) is connected with a container containing a to-be-detected liquid, the horizontal connecting section (41) is in communication with the inside of the container, so that the to-be-detected liquid flows into the inside of the pressure measuring pipe (4). The pressure measuring piece (5) is used for collecting the pressure generated by compressed air between the liquid surface of the to-be-detected liquid flowing into the inside of the pressure measuring pipe (4) and the bottom of the corresponding pressure measuring piece (5), and then the liquid density of the to-be-detected liquid is obtained through the height difference between the first detection assembly (2) and the second detection assembly (3) and the pressure values collected respectively. The detection device body (1) further comprises a displacement measuring piece (6) arranged between the first detection assembly (2) and the second detection assembly (3) and used for measuring the height difference between the first detection assembly (2) and the second detection assembly (3).

2. The automatic liquid density detection device according to claim 1, wherein The displacement measuring piece (6) is in a pull rope type structure, and the active end of the pull rope of the displacement measuring piece (6) is fixedly connected with the horizontal connecting section (41) of the second detection assembly (3). The ports of the horizontal connecting sections (41) included in the first detection assembly (2) and the second detection assembly (3) are movably connected with connecting pieces (7) outside the ports, and the connecting pieces (7) are used for connecting the first detection assembly (2) and the second detection assembly (3) with two measuring interfaces on the outer side wall of the container.

3. The automatic liquid density detection device according to claim 1, wherein The detection device body (1) further comprises a signal processing assembly (8).

4. The automatic liquid density detection device according to claim 2, wherein The signal processing assembly (8) comprises an outer shell (81), and the first detection assembly (2) is fixedly arranged on the top of the outer shell (81); and the signal processing assembly (8) is used for calculating the liquid density of the to-be-detected liquid. The two pressure measuring pieces (5) and the displacement measuring piece (6) are connected with the signal processing assembly (8) through signal lines (9) respectively, and the signal lines (9) are used for realizing data communication among the pressure measuring pieces (5), the displacement measuring piece (6) and the signal processing assembly (8).

5. The automatic liquid density detection device according to claim 4, wherein The signal processing assembly (8) further comprises a power supply module (82) and a controller (83) arranged in the outer shell (81); the power supply module (82) is used for supplying power for the controller (83), the pressure measuring pieces (5) and the displacement measuring piece (6).

6. The automatic liquid density detection device according to claim 5, wherein The controller (83) is signal-connected with the two pressure measuring pieces (5) and the displacement measuring piece (6), is used for receiving and processing the pressure signals and displacement signals generated by the pressure measuring pieces (5) and the displacement measuring piece (6), and is used for calculating the liquid density of the to-be-detected liquid. ​ 7. The automatic liquid density detection device according to claim 6, wherein The signal processing assembly (8) further comprises at least three signal lights (84) arranged on the top of the outer housing (81), the three signal lights (84) having light-emitting bodies of different colors for indicating the working state of the detection device body (1), wherein the working state at least includes a charging state, a fault state and a running state.

8. The automatic liquid density detection device according to claim 4, wherein The detection device body (1) further comprises a display (10) in signal connection with the signal processing assembly (8) for presenting the pressure value, the height difference and the liquid density on the interface of the display (10).

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