Liquid level monitoring device of oil-water separator

Abstract

The utility model discloses a liquid level monitoring device of an oil-water separator, which obtains the distance between the internal liquid level of the oil-water separator and a top plate of the oil-water separator based on the monitoring device, and compares the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator with a preset warning threshold value. Whether the interior of the oil-water separator is in a blocked state or not is judged, and the working states of the stay wire type displacement sensor and the adjusting device are further controlled according to the judgment result. In the whole monitoring process, an informatization technology is utilized, so that the change of the liquid level of the oil-water separator is changed from manual inspection to more accurate and more professional automatic monitoring, and the working efficiency is effectively improved. In addition, the position of the monitoring device in the oil-water separator is adjusted based on the adjusting device, so that liquid level change data can be monitored more accurately, space is vacated for subsequent oil stain cleaning, efficient construction is achieved, the oil stain cleaning working efficiency is further improved, and efficient operation of a project is promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a liquid level monitoring device for an oil-water separator. Background Art

[0002] With the rapid development of society, engineering projects are flourishing everywhere. In the process of engineering project construction, the treatment of restaurant wastewater is an indispensable part of environmental protection. In order to solve the environmental problems caused by restaurant wastewater, oil-water separators came into being. Through multi-stage oil separation and solid particle filtration treatment, oil, water and sediment are discharged separately. Considering that the oil-water separator needs to be cleaned regularly to prevent clogging, it is necessary to monitor the oil and sewage liquid level inside it.

[0003] The traditional method of monitoring the liquid level of an oil-water separator is to use a liquid level meter to measure the level and perform manual inspections. This method is greatly affected by factors such as the construction site environment and the temperature and humidity inside the oil-water separator. During the operation of the oil-water separator, the internal temperature can reach 40-50°C, which can easily generate interference such as water vapor. In addition, the use of a liquid level meter requires long-term real-time power supply, the installation steps are complicated, time-consuming and labor-intensive, and there are low precision and efficiency. The product quality cannot be effectively guaranteed, which brings a huge workload and certain safety hazards to the inspection personnel.

[0004] In view of the shortcomings of the oil-water separator liquid level monitoring method in the prior art, those skilled in the art have been looking for solutions. Utility Model Content

[0005] The utility model aims to provide a liquid level monitoring device for an oil-water separator, so as to solve the problem that the liquid level monitoring of the oil-water separator in the prior art relies on semi-automatic and semi-manual regular inspection, which has low efficiency and low precision.

[0006] In order to solve the above technical problems, the utility model provides a liquid level monitoring device for an oil-water separator, the liquid level monitoring device for an oil-water separator comprising: a monitoring device and an adjusting device for adjusting the position of the monitoring device; wherein,

[0007] The adjusting device comprises: two sliding mounting plates, two transverse sliding rails and two longitudinal sliding rails, each sliding mounting plate is mounted on a transverse sliding rail and can move along the transverse sliding rail;

[0008] The monitoring device comprises: a floating plate, two limit rods, two fixed mounting plates, a controller and a pull-wire displacement sensor. The two fixed mounting plates are respectively fixedly mounted on the bottom surface of the top plate and the bottom plate surface of the oil-water separator, two transverse sliding rails are respectively fixedly mounted on the surfaces of the two fixed mounting plates, and two longitudinal sliding rails are respectively fixedly mounted on the sides of the two fixed mounting plates; two limit rods are parallel to each other and penetrate the floating plate, and are vertically fixed between the two sliding mounting plates; the pull-wire displacement sensor is installed between the two limit rods, on the sliding mounting plate on the bottom surface of the top plate of the oil-water separator, to measure the displacement of the oil-water separator. The controller is installed on the side of the fixed mounting plate adjacent to the bottom surface of the top plate of the oil-water separator, and based on the distance measured by the pull-wire displacement sensor, the thickness of the sliding mounting plate and the thickness of the fixed mounting plate, the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is calculated, and the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is compared with a preset warning threshold to determine whether the interior of the oil-water separator is in a blocked state, and the working state of the pull-wire displacement sensor and the adjustment device is further controlled according to the judgment result.

[0009] Optionally, in the liquid level monitoring device of the oil-water separator, the monitoring device also includes: a visual display terminal connected to the controller, for displaying the internal liquid level changes of the oil-water separator, and performing an alarm operation when the interior of the oil-water separator is in a blocked state.

[0010] Optionally, in the liquid level monitoring device for the oil-water separator, the controller is connected to the visual display terminal via a wireless network.

[0011] Optionally, in the liquid level monitoring device of the oil-water separator, the pull-wire displacement sensor includes: a pull wire, a pull buckle and a counterweight, one end of the pull wire is fixed to a sliding mounting plate on the side of the bottom surface of the top plate adjacent to the oil-water separator, and the other end is fixedly connected to the pull buckle fixed on the upper surface of the floating plate, and the counterweight is arranged on the bottom surface of the floating plate. When the liquid level in the oil-water separator changes, the floating plate will float up and down, thereby driving the pull buckle to float up and down, and then driving the pull wire to stretch or contract, and the liquid level change distance in the oil-water separator is judged according to the length of the stretching or contraction of the pull wire.

[0012] Optionally, in the liquid level monitoring device for the oil-water separator, two auxiliary holes adapted to two limit rods are provided on the floating plate, and the floating plate can move up and down along the two limit rods.

[0013] Optionally, in the liquid level monitoring device for the oil-water separator, the preset warning threshold is greater than the distance between the water outlet of the lower water outlet pipe of the oil-water separator and the top plate of the oil-water separator.

[0014] Optionally, in the liquid level monitoring device for the oil-water separator, the two longitudinal sliding tracks and the two transverse sliding tracks are both single-sided semi-open structures.

[0015] Optionally, in the liquid level monitoring device of the oil-water separator, the sides of the two fixed mounting plates are both "H"-shaped, and each fixed mounting includes a main body, a horizontal plate connected to the main body, and a vertical plate connected to the horizontal plate and perpendicular to the horizontal plate. The horizontal plate extends from the half-opening of the longitudinal sliding track to the interior of the longitudinal sliding track, and is connected to the vertical plate embedded in the interior of the longitudinal sliding track to support the fixed mounting plate to slide relative to the longitudinal sliding track.

[0016] Optionally, in the liquid level monitoring device of the oil-water separator, the two sliding mounting plates are both in the shape of an "I", and each sliding mounting plate includes a top plate, a bottom plate, and a web plate arranged between the top plate and the bottom plate, and the web plate extends from the half-opening of the transverse sliding track to the interior of the transverse sliding track, and is connected to the top plate embedded in the interior of the transverse sliding track to support the sliding mounting plate to slide relative to the transverse sliding track.

[0017] In the liquid level monitoring device of the oil-water separator provided by the utility model, the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is obtained based on the monitoring device, and the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is compared with the preset warning threshold value to determine whether the interior of the oil-water separator is in a blocked state, and the working state of the pull-wire displacement sensor and the adjusting device is further controlled according to the judgment result. The entire monitoring process uses information technology to transform the change of the liquid level of the oil-water separator from manual inspection to more accurate and professional automatic monitoring, which effectively improves work efficiency. In addition, the position of the monitoring device in the oil-water separator is adjusted based on the adjusting device, so that the liquid level change data can be monitored more accurately, and space can be freed up for subsequent cleaning of oil pollution. The efficient construction further improves the efficiency of oil pollution cleaning work and promotes the efficient operation of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of a liquid level monitoring device for an oil-water separator in one embodiment of the utility model;

[0019] Figure 2 yes Figure 1 Sectional view along AA;

[0020] Figure 3 yes Figure 1 A partial enlarged schematic diagram of the middle X;

[0021] Figure 4 yes Figure 1 A partial enlarged schematic diagram of Y in the middle;

[0022] Figure 5 It is an elevation view of a fixed mounting plate and a longitudinal sliding track installed on one side of the bottom surface of the top plate of the oil-water separator;

[0023] Figure 6 It is a side view of a sliding mounting plate and a transverse sliding track installed on one side of the bottom surface of the top plate of the oil-water separator;

[0024] Figure 7 It is an elevation view of a fixed mounting plate and a longitudinal sliding track mounted on one side of the bottom plate surface of the oil-water separator;

[0025] Figure 8 It is a side view of a sliding mounting plate and a transverse sliding track installed on one side of the bottom plate surface of the oil-water separator.

[0026] In the figure:

[0027] 1-Oil and sewage inlet; 2-Filter chamber; 3-Oil pollution; 4-Sewage; 5-First-level grease trap;

[0028] 6-limit rod; 6'-auxiliary hole; 7,15-fixed mounting plate; 8,14-sliding mounting plate; 9-pull-wire displacement sensor; 10-pull wire; 11-floating plate; 12-pull buckle; 13-counterweight; 16-lower water outlet pipe; 17-controller; 18-wireless network; 19-visual display terminal; 20, 20'-lateral sliding track; 21, 21'-longitudinal sliding track; 22-floor; DETAILED DESCRIPTION

[0029] The following is a further detailed description of the liquid level monitoring device for the oil-water separator proposed by the utility model in combination with the accompanying drawings and specific embodiments. The advantages and features of the utility model will become clearer according to the following description and claims. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0030] Please refer to Figures 1 to 4The liquid level monitoring device of the oil-water separator includes: a monitoring device and an adjusting device for adjusting the position of the monitoring device; wherein the adjusting device includes: two sliding mounting plates 8, 14, two transverse sliding rails 20, 20' and two longitudinal sliding rails 21, 21', the transverse sliding rails 20, 20' and the longitudinal sliding rails 21, 21' are perpendicular to the horizontal space, each sliding mounting plate is installed on a transverse sliding rail and can move along the transverse sliding rail; the monitoring device includes: a floating plate 11, two limiting rods 6, two fixed mounting plates 7, 15, a controller 17 and a pull-wire displacement sensor 9, the two fixed mounting plates 7, 15 are respectively fixedly mounted on the bottom surface of the top plate and the bottom plate surface of the oil-water separator, the two transverse sliding rails 20, 20' are respectively fixedly mounted on the surfaces of the two fixed mounting plates 7, 15, and the two longitudinal sliding rails 21, 21' are respectively fixedly mounted on the sides of the two fixed mounting plates 7, 15; the two limiting rods are parallel to each other The line passes through the floating plate 11 and is vertically fixed between the two sliding mounting plates 8, 14; the wire-pull displacement sensor 9 is installed between the two limit rods, on the sliding mounting plate 8 on the side of the bottom surface of the top plate of the oil-water separator, to measure the distance H between the sliding mounting plate 8 where it is located and the floating plate 11; the controller 17 is installed on the side of the fixed mounting plate 7 on the bottom surface of the top plate of the oil-water separator (specifically installed on the side of the fixed mounting plate 7 without longitudinal sliding track at an interference-free position), based on the distance H measured by the wire-pull displacement sensor 9, the thickness of the sliding mounting plate 8 and the thickness of the fixed mounting plate 7, the distance E+H between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is calculated, and the distance E+H between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is compared with the preset warning threshold to determine whether the interior of the oil-water separator is in a blocked state, and the working state of the wire-pull displacement sensor 9 and the adjustment device is further controlled according to the judgment result. The preset warning threshold is greater than the distance D between the water outlet of the lower water outlet pipe 16 of the oil-water separator and the top plate of the oil-water separator.

[0031] Specifically, the process of determining whether the interior of the oil-water separator is in a blocked state is as follows:

[0032] Compare the distance E+H between the internal liquid level of the oil-water separator and the top plate of the oil-water separator with the preset warning threshold. When the distance E+H is less than or equal to the preset warning threshold, it is judged that the interior of the oil-water separator is in a blocked state and oil cleaning is required; when the distance E+H is greater than the preset warning threshold, it is judged that the interior of the oil-water separator is in a normal working state and oil cleaning is not required. Wherein, E is the sum of the thickness of the sliding mounting plate 8 and the thickness of the fixed mounting plate 7.

[0033] In this embodiment, the adjusting device of the liquid level monitoring device of the oil-water separator is used to adjust the sliding position of the monitoring device so that it does not affect the operation of the oil-water separation container itself and does not interfere with the subsequent oil pollution cleaning work. The monitoring device is installed at the top position inside the oil-water separator to monitor the change of the liquid level and push alarm information. The change of the oil pollution liquid level is judged by the change of the pull wire length of the pull wire displacement sensor 9, so as to analyze the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator, and then judge whether the inside of the oil-water separator is in a blocked state.

[0034] Please continue to refer to Figure 1 The monitoring device also includes: a visual display terminal 19 connected to the controller 17, for displaying the internal liquid level changes of the oil-water separator and performing an alarm operation when the interior of the oil-water separator is in a blocked state; wherein the controller 17 is connected to the visual display terminal 19 and the pull-wire displacement sensor 9 via a wireless network 18.

[0035] like Figure 1 As shown, the pull-wire displacement sensor 9 includes: a pull-wire 10, a buckle 12 and a counterweight 13. One end of the pull-wire is fixed on the sliding mounting plate 8 on the side of the bottom surface of the top plate near the oil-water separator, and the other end is fixedly connected to the buckle 12 fixed on the upper surface of the floating plate 11. The counterweight 13 is arranged on the bottom surface of the floating plate 11 to offset the tension of the pull-wire 10. When the liquid level in the oil-water separator changes, the floating plate 11 will float up and down, thereby driving the buckle 12 to float up and down, and then driving the pull-wire 10 to stretch or contract. The distance of the liquid level change in the oil-water separator is determined according to the length of the stretching or contraction of the pull-wire 10. In this embodiment, the pull-wire displacement sensor 9 has functions such as signal transmission and command execution. It can monitor the distance from the floating plate 11 to the pull-wire displacement sensor 9, cooperate with the pull-wire 10, the buckle 12, etc. to monitor the liquid level change of the oil pollution, and feed back the monitoring data to the controller 17, and execute the corresponding command fed back by the controller 17.

[0036] Please refer to Figure 1 and Figure 2In this embodiment, the limit rod 6 is preferably a cylindrical rod. The floating plate 11 is provided with two auxiliary holes 6' adapted to the two limit rods 6 (that is, the size of the opening is consistent with the cross-sectional size and shape of the fiber rod). Correspondingly, the cross-sectional shape of the auxiliary hole 6' is circular, and the floating plate 11 can move up and down along the two limit rods 6 (that is, the floating plate 11 is not clamped and fixed on the two limit rods 6). Here, the two limit rods 6 play the role of limiting the horizontal position of the floating plate to prevent the floating plate 11 from shifting and causing inaccurate measurement data. A counterweight 13 is installed at the bottom of the floating plate 11 to offset the tension of the wire 10 of the wire-type displacement sensor 9. Because the wire 10 itself has a certain tension, the tension of the wire 10 of the wire-type displacement sensor 9 can be tested in advance, and then the corresponding counterweight 13 is matched. At this time, the tension of the wire 10 and the pressure of the counterweight 13 offset each other.

[0037] Please refer to Figure 5 and Figure 6 The two longitudinal sliding tracks 21, 21' and the two transverse sliding tracks 20, 20' are both single-sided semi-open structures. The sides of the two fixed installation plates 7, 15 are both "H"-shaped, and each fixed installation includes a main body, a transverse plate connected to the main body, and a vertical plate connected to the transverse plate and perpendicular to the transverse plate. The transverse plate extends from the semi-open part of the longitudinal sliding track to the inside of the longitudinal sliding track, and is connected to the vertical plate embedded in the longitudinal sliding track to support the fixed installation plate to slide relative to the longitudinal sliding track.

[0038] Please refer to Figure 7 and Figure 8 The two longitudinal sliding rails 21, 21' and the two transverse sliding rails 20, 20' are both single-sided semi-open structures. The two sliding mounting plates 8, 14 are both "I" shaped, and each sliding mounting plate includes a top plate, a bottom plate, and a web plate arranged between the top plate and the bottom plate. The web plate extends from the semi-opening of the transverse sliding rail to the inside of the transverse sliding rail and is connected to the top plate embedded in the inside of the transverse sliding rail to support the sliding mounting plate to slide relative to the transverse sliding rail.

[0039] In order to better understand the working principle of the liquid level monitoring device of the oil-water separator of the utility model, the following is combined with Figures 1 to 6 , based on the actual scenario of the liquid level warning device being applied to the oil-water separator, the details are as follows:

[0040] Please refer to Figure 1 , understand the structure and working principle of the oil-water separator. Figure 1As shown, the oil-water separator includes: a primary grease trap 5, a filter tank 2 and an oily sewage inlet 1. The primary grease trap 5 is arranged at the bottom of the filter tank 2, wherein the filter tank 2 is closed on all sides and half-open at the bottom, and a screen is arranged at the opening. Usually, the oil-water separators at the construction site are generally arranged below the floor 22 (in this embodiment, the top plate of the oil-water separator is flush with the floor 22), one end of the oily sewage inlet 1 is connected to the kitchen oil sewage drain pipe at the construction site, and the other end is connected to the filter tank 2. When the oily sewage enters the filter tank 2, the solid particles are isolated by the screen of the filter tank 2, and the oily sewage 3 and the sewage 4 enter the primary grease trap 5. Since the density of water is greater than that of oil, the oily sewage 3 floats on the surface of the sewage 4; after the oily sewage 3 is isolated, the sewage 4 at the bottom enters the secondary grease trap through the lower outlet pipe 16 for secondary isolation.

[0041] like Figure 1 As shown, the setting position of the liquid level monitoring device relative to the oil-water separator in this embodiment is that it is set inside the oil-water separator, specifically, it is set inside the first-level oil separator tank 5.

[0042] During the installation phase of the liquid level monitoring device for the oil-water separator, it is necessary to first measure: the distance D between the water outlet of the lower water outlet pipe 16 and the top plate of the oil-water separator (in this embodiment, since the floor 13 is flush with the top plate of the oil-water separator, it is also equivalent to the distance from the water outlet of the lower water outlet pipe 16 to the floor 22), the thickness of the sliding mounting plate 8 and the thickness of the fixed mounting plate 7, and determine the preset warning threshold as the threshold for cleaning the oil blockage to prevent oil overflow. The basis for setting the preset warning threshold is that it is necessary to consider that the lower water outlet pipe 16 may also be blocked after the oil blockage, so the preset warning threshold is slightly larger than the distance between the water outlet of the lower water outlet pipe 16 and the top plate of the oil-water separator. In this embodiment, if the slightly larger value is assumed to be 100mm, the preset warning threshold is D+100mm.

[0043] After the installation of the liquid level monitoring device of the oil-water separator is completed, the controller 17 issues a "monitoring" command to the pull-wire displacement sensor 9. After receiving the command, the pull-wire displacement sensor 9 measures the distance H between the sliding mounting plate 8 and the floating plate 11, and feeds back the measured distance H to the controller 17. After receiving the feedback distance H information, the controller 17 compares and converts H with the superimposed thickness E and distance D of the sliding mounting plate 8 and the fixed mounting plate 7 measured in advance, and obtains the distance E+H between the internal liquid level of the oil-water separator and the top plate of the oil-water separator. The following assumes that the preset warning threshold is D+100mm as an example, including the following two cases:

[0044] Case 1: When H+E>D+100mm, it indicates that the primary grease trap 5 is in normal working condition, and the controller 17 issues a "continue monitoring" instruction to the pull-wire displacement sensor 9, and at the same time sends the monitoring results to the cloud server through the wireless network 18, and sends the data to the visual display terminal 19 for display.

[0045] Case 2: When H+E≤D+100mm, it means that the primary grease trap 5 is in a blocked state, and the oil stains 3 therein are too blocked and need to be cleaned. At this time, the controller 17 sends the monitoring results and alarm information to the cloud server through the wireless network 18, and displays the "early warning alarm" to the visual display terminal 19, and pushes the alarm information to the project management personnel to remind the management personnel to carry out the cleaning work.

[0046] When the monitoring device is in working state, considering that the liquid surface of the corner of the first-level grease trap 5 may accumulate oil 3, the entire monitoring device is slid to the middle part of the first-level grease trap 5 as much as possible through the adjusting device during monitoring. When the oil 3 needs to be blocked and cleaned, considering that the monitoring device is in the middle part, it will have a certain impact on the cleaning work, the entire monitoring device can be slid to the corner near the side wall through the adjusting device, so as not to affect the cleaning work of the oil 3, and effectively improve the cleaning construction efficiency. The following is a detailed description of the adjusting device: when the monitoring device is in working state, the fixed mounting plate 7 and the fixed mounting plate 15 are first pushed longitudinally to the middle part of the side wall of the first-level grease trap 5 through the longitudinal sliding track 21 and the longitudinal sliding track 21', and then the sliding mounting plate 8 and the sliding mounting plate 14 are pushed to the middle part of the first-level grease trap 5 through the transverse sliding track 20 and the transverse sliding track 20'. At this time, the monitoring device is in the middle part of the first-level grease trap 5, so as to more accurately monitor the liquid surface position of the oil 3. On the contrary, when the monitoring device is not working and the oil stains 3 are cleaned, the sliding mounting plates 8 and 14 are first pushed to the middle part of the side wall through the transverse sliding rails 20 and the transverse sliding rails 20', and then the fixed mounting plates 7 and 15 are longitudinally pushed to the corners of the side wall through the longitudinal sliding rails 21 and the longitudinal sliding rails 21', so that the entire monitoring device is at the corners of the side wall and does not affect the cleaning of the oil stains 3.

[0047] It can be understood that the above examples are merely examples listed for a better understanding of the technical solutions of the embodiments of the present application, and are not intended to be the sole limitation to the embodiments.

[0048] In summary, in the liquid level monitoring device of the oil-water separator provided by the utility model, the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is obtained based on the monitoring device, and the distance between the internal liquid level of the oil-water separator and the top plate of the oil-water separator is compared with the preset warning threshold value to determine whether the interior of the oil-water separator is in a blocked state, and the working state of the pull-wire displacement sensor and the adjusting device is further controlled according to the judgment result. The entire monitoring process uses information technology to transform the change of the liquid level of the oil-water separator from manual inspection to more accurate and professional automated monitoring, which effectively improves work efficiency. In addition, the position of the monitoring device in the oil-water separator is adjusted based on the adjusting device, so that the liquid level change data can be monitored more accurately, and space can be freed up for subsequent cleaning of oil pollution. The efficient construction further improves the efficiency of oil pollution cleaning work and promotes the efficient operation of the project.

[0049] Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. A liquid level monitoring device for an oil-water separator, characterized in that: include: A monitoring device and an adjusting device for adjusting the position of the monitoring device; wherein, The adjustment device comprises: two sliding mounting plates (8, 14), two transverse sliding rails (20, 20') and two longitudinal sliding rails (21, 21'), each sliding mounting plate being mounted on a transverse sliding rail and being movable along the transverse sliding rail; The monitoring device comprises: a floating plate (11), two limit rods (6), two fixed mounting plates (7, 15), a controller (17) and a pull-wire displacement sensor (9), wherein the two fixed mounting plates (7, 15) are respectively fixedly mounted on the bottom surface of the top plate and the bottom plate of the oil-water separator, two transverse sliding rails (20, 20') are respectively fixedly mounted on the surfaces of the two fixed mounting plates (7, 15), and two longitudinal sliding rails (21, 21') are respectively fixedly mounted on the surfaces of the two fixed mounting plates ( 7,15); two limit rods are parallel to each other and penetrate the floating plate (11), and are vertically fixed between two sliding mounting plates (8,14); the wire-drawing displacement sensor (9) is installed between the two limit rods, on the sliding mounting plate (8) on the side of the bottom surface of the top plate of the oil-water separator, so as to measure the distance (H) between the sliding mounting plate (8) where it is located and the floating plate (11); the controller (17) is installed on the side of the fixed mounting plate (7) on the bottom surface of the top plate of the oil-water separator.

2. The liquid level monitoring device for an oil-water separator according to claim 1, characterized in that: The monitoring device further comprises: a visual display terminal (19) connected to the controller (17) for displaying changes in the internal liquid level of the oil-water separator and performing an alarm operation when the interior of the oil-water separator is in a blocked state.

3. The liquid level monitoring device for an oil-water separator according to claim 2, characterized in that: The controller (17) is connected to the visual display terminal (19) via a wireless network (18).

4. The liquid level monitoring device for an oil-water separator according to claim 1, characterized in that: The pull-wire displacement sensor (9) comprises: a pull-wire (10), a buckle (12) and a counterweight (13); one end of the pull-wire is fixed to a sliding mounting plate (8) on one side of the bottom surface of the top plate adjacent to the oil-water separator, and the other end is fixedly connected to the buckle (12) fixed to the upper surface of the floating plate (11); the counterweight (13) is arranged on the bottom surface of the floating plate (11); when the liquid level in the oil-water separator changes, the floating plate (11) is driven to float up and down, thereby driving the buckle (12) to float up and down, and further driving the pull-wire (10) to stretch or contract; the distance of the liquid level change in the oil-water separator is determined according to the length of the stretching or contraction of the pull-wire (10).

5. The liquid level monitoring device for an oil-water separator according to claim 1, characterized in that: The floating plate (11) is provided with two auxiliary holes (6') adapted to the two limiting rods (6), and the floating plate (11) can move up and down along the two limiting rods (6).

6. The liquid level monitoring device for an oil-water separator according to claim 1, characterized in that: The two longitudinal sliding tracks (21, 21') and the two transverse sliding tracks (20, 20') are both single-sided semi-open structures.

7. The liquid level monitoring device for an oil-water separator according to claim 6, characterized in that: The sides of the two fixed installation plates (7, 15) are both in an "H" shape. Each fixed installation comprises a main body, a horizontal plate connected to the main body, and a vertical plate connected to the horizontal plate and perpendicular to the horizontal plate. The horizontal plate extends from a half-opening of the longitudinal sliding track to the inside of the longitudinal sliding track and is connected to the vertical plate embedded in the longitudinal sliding track to support the fixed installation plate to slide relative to the longitudinal sliding track.

8. The liquid level monitoring device for an oil-water separator according to claim 6, characterized in that: The two sliding mounting plates (8, 14) are both in an "I" shape, and each sliding mounting plate comprises a top plate, a bottom plate, and a web plate arranged between the top plate and the bottom plate, wherein the web plate extends from a half opening of the transverse sliding track to the inside of the transverse sliding track and is connected to the top plate embedded in the inside of the transverse sliding track to support the sliding mounting plate to slide relative to the transverse sliding track.

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