High-precision non-contact liquid level monitoring equipment

Abstract

The invention discloses high-precision non-contact liquid level monitoring equipment, and relates to the technical field of transformer oil level detection.The high-precision non-contact liquid level monitoring equipment comprises a transformer, a transformer shell is connected with a support, an oil conservator is fixed to the support, a testing mechanism is arranged on the lower side, opposite to the oil conservator, of the support, and the testing mechanism comprises a moving track; a test trolley is arranged on the moving track and comprises a mounting frame, a mounting plate is fixed to the lower side of the mounting frame, a first driver is mounted on the mounting plate, the driving end of the first driver extends out of the mounting plate and is connected with a swing arm, and a base box is fixed to the lower end of the swing arm; a plurality of test grooves are formed in one side, facing the expansion tank, of the base box at intervals, the test grooves comprise upper test grooves and lower test grooves, and probes are arranged between the upper test grooves and the lower test grooves of the base box. According to the invention, the convenience and accuracy of liquid level detection of the oil conservator are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer oil level detection, in particular to a high-precision contactless liquid level monitoring device. Background Art

[0002] A transformer is an electrical device that, based on the principle of electromagnetic induction, converts AC power of one voltage level into AC power of another voltage level of the same frequency. The oil conservator is the transformer's oil storage device, used to regulate the volume changes of the oil in the transformer tank.

[0003] Currently, conservator oil levels are primarily checked visually on-site. Two types of on-site oil level gauges are used: glass tube oil level gauges and pointer oil level gauges. Neither type of gauge has remote signal transmission, requiring only on-site visual inspection. Visual inspection has numerous limitations. Without remote signal transmission, it requires on-site manual inspection or telescopic observation. The accuracy of oil level checks largely relies on the inspector's experience.

[0004] To overcome the shortcomings of the two oil-level detection methods, various non-contact measurement methods have been proposed. Sonar ranging is one such method. This method measures the internal oil level by attaching a probe to the outer wall of the oil conservator bottom. However, due to the high height of the transformer oil conservator, raising the probe to the underside of the conservator is difficult. Furthermore, test accuracy is affected by the position of the probe, and poor contact with the surface can reduce the accuracy of the test results. Summary of the Invention

[0005] The object of the present invention is to provide a high-precision contactless liquid level monitoring device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a high-precision contactless liquid level monitoring device, including a transformer, a transformer shell connected to a bracket, an oil pillow fixed on the bracket, a testing mechanism provided on the lower side of the bracket relative to the oil pillow, the testing mechanism including a movable track, a testing trolley provided on the movable track, the testing trolley including a mounting frame, a mounting plate fixed on the lower side of the mounting frame, a driver 1 mounted on the mounting plate, a driving end of the driver 1 extending out of the mounting plate and connected to a swing arm, a base box fixed at the lower end of the swing arm.

[0007] According to the above technical solution, a number of test slots are spaced apart on one side of the base box facing the oil pillow, and the test slots include an upper test slot and a lower test slot. A probe is provided between the base box relative to the upper test slot and the lower test slot. A spring 1 is connected to the bottom of the test slot, and a force sensing module is laid on the inner wall surface of the test slot. The other end of the spring 1 is connected to a pressure plate, and the pressure plate is connected to a guide frame in conjunction with each test slot.

[0008] According to the above technical solution, a plurality of long grooves are provided on the circumference of the guide frame to reduce the overall weight of the guide frame.

[0009] According to the above technical solution, a slide groove is opened on both sides of the probe, and a slider is movably arranged in the slide groove. A spring 2 is connected between the side of the slide groove away from the probe and the slider. A sponge cover is connected to the upper side of the slider. A pull rope is connected to the side of the slider facing the probe. The other end of the pull rope extends into the test slot and is connected to the lower surface of the pressure plate.

[0010] According to the above technical solution, a through hole is provided between the test slot and the slide slot to cooperate with the pull rope. The position of the through hole corresponds to the long slot, and an embedding slot is provided on the side of the sponge cover opposite to the probe.

[0011] According to the above technical solution, the slider is subjected to the tension of the pull rope, and the elasticity of the spring 1 is greater than the elasticity of the spring 2.

[0012] According to the above technical solution, an accordion cover is connected between the slider and the slide groove to prevent foreign objects from getting stuck in the slide groove and affecting the movement of the slider.

[0013] According to the above technical solution, a support frame is fixed on one side of the mounting frame, and a slot is provided on the support frame to cooperate with the swing arm. The support frame is provided with rotating covers on both sides of the swing arm. One end of the rotating cover is connected to a rotating rod, and the rotating rod is rotatably set on the surface of the support frame. A torsion spring is connected between the rotating rod and the support frame, and the upper end of the rotating rod is connected to the rocker arm, and the other end of the rocker arm is located between the swing arm and the support frame.

[0014] According to the above technical solution, the movable track is zigzag-shaped, including a lower platform, an inclined platform and an upper platform, wherein the two ends of the inclined platform are respectively connected to the lower platform and the upper platform, a rack is provided on the lower side of the inclined platform, a sub-plate is connected to the upper side of the mounting frame, a space is provided between the sub-plate and the mounting frame, and a driver 2 is fixed at both ends of the lower side of the mounting frame, and a driving end of the driver 2 is provided with a gear, which is provided between the sub-plate and the mounting frame, and the gear cooperates with the corresponding rack.

[0015] According to the above technical solution, a group of protective components are provided at the lower end of the upper platform and the oil pillow.

[0016] According to the above technical solution, the protective component includes a column, a mobile box is fixed on the column, the upper side of the mobile box is open, a screw is arranged to rotate inside the mobile box, one end of the screw extends out of the mobile box and is connected to driver three, a movable block is sleeved on the screw, the movable block cooperates with the screw thread, and a sponge block is connected to the upper side of the movable block.

[0017] Compared with the existing technology, the present invention has the following beneficial effects: by providing a test trolley, the present invention adjusts the horizontal and vertical states of the base box by changing the rotation state of the swing arm, thereby meeting the test requirements. After the pressure plates on both sides of the probe contact the lower surface of the oil pillow, they determine whether the probe is located at the lowest point on the lower side of the oil pillow based on the height difference of the pressure, thereby ensuring the accuracy of sonar detection. By providing a protective component, the oil pillow test point can be protected under normal circumstances. In rainy weather, the sponge block can absorb rainwater rolling down the oil pillow surface, reducing the possibility of peeling and rusting of the tested oil pillow surface. The reciprocating motion of the sponge block and rainwater can be used to clean the test surface on the lower side of the oil pillow, further improving the accuracy of the detection and indirectly protecting the probe surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the liquid level monitoring device of the present invention; Figure 2 It is a partial schematic diagram of the liquid level monitoring device of the present invention; Figure 3 It is a structural schematic diagram of the testing mechanism of the present invention; Figure 4 This is a schematic diagram of the connection structure of the swing arm and the base box of the present invention; Figure 5 It is a partial structural schematic diagram of the base box of the present invention; Figure 6 It is a partial cross-sectional view of the base box of the present invention; Figure 7 It is a structural schematic diagram of the rotary cover of the present invention; Figure 8 This invention Figure 7 A magnified schematic diagram of area A; Figure 9 It is a structural schematic diagram of the mobile track of the present invention; Figure 10 It is a schematic structural diagram of the protective assembly of the present invention; Figure 11 It is a partial structural diagram of the protection component of the present invention.

[0019] Figure: 1, transformer; 2, bracket; 3, oil pillow; 4, test mechanism; 5, moving track; 51, lower platform; 52, tilting platform; 521, rack; 53, upper platform; 6, test trolley; 61, mounting frame; 611, mounting plate; 612, support frame; 613, rotating cover; 614, rotating rod; 615, torsion spring; 616, rocker arm; 62, driver 1; 63, swing arm; 64, base box; 641, test slot; 642, spring Spring 1; 643, pressure plate; 644, guide frame; 6441, long groove; 645, slide groove; 646, slider; 647, spring 2; 648, sponge cover; 6481, embedded groove; 649, through hole; 65, probe; 66, accordion cover; 67, sub-plate; 68, driver 2; 69, gear; 7, protective assembly; 71, column; 72, moving box; 73, screw; 74, driver 3; 75, movable block; 76, sponge block. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figures 1-11 The present invention provides a technical solution: a high-precision contactless liquid level monitoring device, including a transformer 1, a bracket 2 is connected to the transformer 1 shell, an oil pillow 3 is fixed on the bracket 2, a testing mechanism 4 is provided on the lower side of the bracket 2 relative to the oil pillow 3, the testing mechanism 4 includes a movable track 5, a testing trolley 6 is provided on the movable track 5, the testing trolley 6 includes a mounting frame 61, a mounting plate 611 is fixed to the lower side of the mounting frame 61, a driver 62 is installed on the mounting plate 611, a driving end of the driver 62 extends out of the mounting plate 611 and is connected to a swing arm 63, and a base box 64 is fixed to the lower end of the swing arm 63.

[0022] like Figure 5 As shown, a plurality of test slots 641 are spaced apart on one side of the base box 64 facing the oil pillow 3. The test slots 641 include an upper test slot and a lower test slot. A probe 65 is provided between the upper test slot and the lower test slot of the base box 64. A spring 1 642 is connected to the bottom of the test slot 641. A force sensing module is laid on the inner wall surface of the test slot 641. The other end of the spring 1 642 is connected to a pressure plate 643. The pressure plate 643 is connected to a guide frame 644 in conjunction with each test slot 641.

[0023] Supplementary explanation based on the above structure follows: In the absence of external force, the pressure plate 643 is supported by spring 1 642, and the guide frame 644 slides in engagement with the test slot 641, with one side extending into the test slot 641. Preferably, the guide frame 644 is provided with a plurality of elongated slots 6441 around its circumference to reduce its overall weight. Initially, the swing arm 63 is positioned perpendicular to the ground, and the actuator 1 62 controls the swing arm 63 to rotate the base box 64. When testing the fluid level within the oil pillow 3, the actuator 1 62 controls the base box 64 to rotate parallel to the ground. At this point, the spring 1 642 is subjected to the weight of the pressure plate 643 and guide frame 644, causing the surface of the pressure plate 643 to rise above the surface of the probe 65. As the base box 64 continues to rise, the pressure plate 643 approaches the lower surface of the oil pillow 3. The pressure on both sides of the probe 65 determines whether the probe 65 is at the lowest point of the oil pillow 3.

[0024] Further, such as Figure 6 As shown, a slide groove 645 is provided on both sides of the probe 65, and a slider 646 is movably provided in the slide groove 645. A spring 2 647 is connected between the side of the slide groove 645 away from the probe 65 and the slider 646. A sponge cover 648 is connected to the upper side of the slider 646. A pull rope is connected to the side of the slider 646 facing the probe 65, and the other end of the pull rope extends into the test slot 641 and is connected to the lower surface of the pressure plate 643.

[0025] It should be noted that a through hole 649 is provided between the test slot 641 and the slide slot 645 to cooperate with the pull rope. The position of the through hole 649 corresponds to the long slot 6441 to prevent the guide frame 644 from affecting the pull rope during its movement. An embedded slot 6481 is provided on the side of the sponge cover 648 opposite to the probe 65.

[0026] In actual operation, slider 646 is subject to the tension of the pull cord, and the elasticity of spring 1 642 is greater than that of spring 2 647. When there is no external force acting on pressure plate 643, the pull cord is subject to the tension of spring 1 642. At this time, slider 646 pulls spring 2 647, causing the two sponge covers 648 on both sides to connect. The covers are located outside the probe 65 to protect the surface of the probe 65. When pressure plate 643 is subjected to external force, spring 1 642 compresses and releases the pull cord, and spring 2 647 pulls slider 646, which drives the sponge cover 648 outward, exposing the probe 65 for detection.

[0027] Optionally, an accordion cover 66 is connected between the slider 646 and the slide groove 645 to prevent foreign objects from getting stuck in the slide groove 645 and affecting the movement of the slider 646.

[0028] like Figure 7 、 Figure 8As shown, a support frame 612 is fixed on one side of the mounting frame 61, and a slot is provided on the support frame 612 to cooperate with the swing arm 63. Rotating covers 613 are respectively provided on both sides of the support frame 612 relative to the swing arm 63. One end of the rotating cover 613 is connected to a rotating rod 614, and the rotating rod 614 is rotatably set on the surface of the support frame 612. A torsion spring 615 is connected between the rotating rod 614 and the support frame 612, and the upper end of the rotating rod 614 is connected to the swing arm 616. The other end of the rocker arm 616 is located between the swing arm 63 and the support frame 612.

[0029] In one embodiment, the front end surface of the support frame 612 is parallel to the ground. After the swing arm 63 enters its slot, the front end surface of the support frame 612 covers the upper surface of the base box 64. In actual operation, when the swing arm 63 is located in the slot of the support frame 612, the rocker arm 616 is pressed by the swing arm 63, and the rotating cover 613 is positioned over the front end of the base box 64. As the swing arm 63 gradually rotates out of the support frame 612, the restraint on the rocker arm 616 is released, and the rotating rod 614, under the action of the torsion spring 615, drives the rotating cover 613 outward, allowing the base box 64 to be smoothly released. The process of the swing arm 63 returning to its slot in the support frame 612 also pushes the rocker arm 616, causing the rotating cover 613 to re-cover the front end of the base box 64. The rotating cover 613 protects the base box 64. The configuration of the rotating cover 613 ensures that its rotation does not interfere with the movement of the swing arm 63 into or out of the slot.

[0030] In one embodiment, Figure 9 As shown, the movable track 5 is zigzag-shaped, including a lower platform 51, an inclined platform 52 and an upper platform 53, wherein the two ends of the inclined platform 52 are respectively connected to the lower platform 51 and the upper platform 53, a rack 521 is provided on the lower side of the inclined platform 52, and a sub-plate 67 is connected to the upper side of the mounting frame 61, and a gap is provided between the sub-plate 67 and the mounting frame 61, and a driver 2 68 is fixed at both ends of the lower side of the mounting frame 61, and a driving end of the driver 2 68 is provided with a gear 69, which is provided between the sub-plate 67 and the mounting frame 61, and the gear 69 cooperates with the corresponding rack 521.

[0031] In actual operation, the second driver 68 controls the rotation of the gear 69 so that the gear 69 can move up and down on the rack 521 , thereby driving the movement of the entire test trolley 6 .

[0032] like Figure 10 As shown, a set of protective components 7 is provided at the lower end of the upper platform 53 in conjunction with the oil pillow 3.

[0033] like Figure 11As shown, the protective component 7 includes a column 71, a movable box 72 is fixed on the column 71, the upper side of the movable box 72 is open, a screw 73 is rotatably arranged inside the movable box 72, one end of the screw 73 extends out of the movable box 72 and is connected to a driver 3 74, a movable block 75 is sleeved on the screw 73, the movable block 75 is threadedly matched with the screw 73, and a sponge block 76 is connected to the upper side of the movable block 75.

[0034] It should be noted that the height of the sponge block 76 is sufficient to fit the lower surface of the oil pillow 3. Under normal conditions, the sponge blocks 76 on both sides are connected, so that the lower surface of the oil pillow 3 is isolated from the outside, which plays a basic protective role. If it rains, the sponge block 76 can absorb the rainwater rolling down the surface of the oil pillow 3, reducing the possibility of peeling and rusting of the measured surface of the oil pillow 3, improving the measurement accuracy, and avoiding the damaged surface of the oil pillow 3 from damaging the surface of the probe 65. During the test, the driver three 74 will control the screw 73 to rotate, so that the movable block 75 moves toward the driver three 74, and the sponge block 76 moves away from the middle area, thereby making room for the measurement position. Furthermore, with the help of the reciprocating motion of the sponge block 76 and rainy weather, the test surface on the lower side of the oil pillow 3 can be cleaned.

[0035] The specific implementation methods are as follows: Under normal conditions, the testing mechanism 4 is in a safe storage and protection mode.

[0036] The test trolley 6 is stably parked at the lower position of the tilting platform 52, ensuring that the main body of the test mechanism 4 is away from the core working area directly below the oil pillow 3, minimizing space occupancy and potential interference, and leaving a channel for subsequent possible maintenance or other operations.

[0037] At this time, the swing arm 63 is perpendicular to the ground, and the base box 64 is located under the protection of the support frame 612 and the rotating cover 613. The support frame 612, the rotating cover 613 and the structure of the base box 64 itself together constitute a protective space surrounded on three sides, which effectively blocks dust, moisture, oil and accidental collisions in the environment, and provides a reliable physical barrier for the precision probe 65 and the internal components of the base box 64.

[0038] The two sponge blocks 76 of the protective component 7 fit together to continuously isolate and protect the test surface of the oil pillow 3.

[0039] During testing, the test carriage 6 moves along the tilting platform 52, with the swing arm 63 adjusted parallel to the ground. The pressure plates 643 on either side of the probe 65 contact the surface of the oil pillow 3, squeezing the guide frame 644 downward along the test slot 641. The force sensing module detects the position of the guide frame 644 within the test slot 641.

[0040] Specifically, when the guide frame 644 contacts the inner wall surface of the test slot 641, the force sensing module can detect the pressure value from the guide frame 644, and use the lowest pressure signal as the standard to determine whether the pressure signals of the upper test slot and the lower test slot are in a similar height range. It can then be determined whether the upper test slot and the lower test slot are at the lowest position on the lower side of the oil pillow 3.

[0041] After determining the test position, the swing arm 63 is controlled to lift up, and the guide frame 644 continues to move downward, so that the spring 2 647 pulls the slider 646, and the slider 646 drives the sponge cover 648 to move outward to expose the probe 65. The probe 65 contacts the test surface of the oil pillow 3 to detect the liquid level.

[0042] A further description of protective assembly 7 is provided. The sponge block 76 is height-adjusted to ensure that its top surface closely conforms to the contours of the lower surface of the oil pillow 3 when the protective assembly 7 is closed. When not in a test state, the sponge blocks 76 on both sides converge toward the center until they completely meet. This close fit forms a continuous, physical barrier covering the target area on the lower surface of the oil pillow 3. The protective effect is reflected in the following aspects.

[0043] Basic environmental isolation: effectively blocks external pollutants such as dust, floating fibers, and insects from directly contacting the lower surface of the oil pillow 3, preventing dirt deposition from affecting the accuracy of subsequent measurements and reducing the risk of scratches on the surface.

[0044] Rainwater management and rust prevention: During rainy weather, rainwater rolling down from the higher reaches of the oil pillow 3 flows to the lower surface, where it is quickly absorbed and trapped by the adjacent sponge block 76. The sponge material's excellent hydrophilicity and water storage capacity significantly reduce the residence time and coverage of rainwater on the metal surface of the oil pillow 3, significantly reducing the likelihood of peeling and rust (corrosion) on the measured surface of the oil pillow 3 due to prolonged or repeated moisture exposure. This not only helps maintain the structural integrity of the oil pillow 3 but also ensures the stability of its surface condition (such as flatness and roughness), thereby indirectly improving the accuracy and reliability of subsequent liquid level detection by the probe 65.

[0045] Probe protection: Keeping the lower surface of the oil pillow 3 clean and intact provides indirect protection for the test probe 65. A clean, undamaged surface effectively prevents the probe 65 from being scratched, clogged, or contaminated by sharp burrs, rust particles, or stubborn dirt on the damaged surface of the oil pillow 3 when in contact or close proximity with the test probe 65. This ensures that the sensitive surfaces of the probe 65 (such as the ultrasonic transmitting / receiving surface or capacitor plates) remain in good working condition for a long time, extending its service life.

[0046] When entering the test state, the sponge blocks 76 on both sides separate from the central connection position to the sides, actively giving up the key measurement position in the middle of the lower surface of the oil pillow 3. This opening and closing action allows the probe 65 of the test mechanism 4 to approach and perform the liquid level detection task without obstruction.

[0047] Furthermore, the self-cleaning function of the sponge block is noteworthy. The reciprocating motion of sponge block 76 (closing, fitting, and separating) also offers a potential benefit: dynamic cleaning. During rainy weather or after artificial wetting, when sponge block 76 closes again and securely fits against the underside of the oil pillow 3, the moistened sponge acts as a "cleaning wipe," its movement gently wiping the surface of the oil pillow 3 in contact. This helps loosen and remove fine dust and lightly attached contaminants that have accumulated on the surface. During separation, some contaminants are carried away by the sponge or absorbed with the water. Over the long term, this periodic "wiping" action, combined with the sponge's water-absorbing properties, helps maintain the relative cleanliness of the measured area under the oil pillow 3, further reducing the risk of measurement errors or accelerated surface corrosion caused by dirt accumulation, thereby creating a passive, low-cost surface maintenance mechanism.

[0048] Furthermore, by applying the swing of the swing arm 63 to the sponge block 76 and squeezing the sponge block 76 upward through the swing arm 63, the water absorption inside the sponge block 76 can be actively reduced, thereby accelerating drying.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A high-precision non-contact liquid level monitoring device, comprising a transformer (1), characterized in that: The transformer (1) housing is connected to a bracket (2), an oil pillow (3) is fixed on the bracket (2), a test mechanism (4) is provided on the lower side of the bracket (2) relative to the oil pillow (3), the test mechanism (4) includes a movable track (5), a test trolley (6) is provided on the movable track (5), the test trolley (6) includes a mounting frame (61), a mounting plate (611) is fixed on the lower side of the mounting frame (61), a driver 1 (62) is installed on the mounting plate (611), a driving end of the driver 1 (62) extends out of the mounting plate (611) and is connected to a swing arm (63), and a base box (64) is fixed to the lower end of the swing arm (63); A plurality of test slots (641) are spaced apart on one side of the base box (64) facing the oil pillow (3), and the test slots (641) include an upper test slot and a lower test slot. A probe (65) is provided between the base box (64) and the upper test slot and the lower test slot. A spring (642) is connected to the bottom of the test slot (641), and a force sensing module is laid on the inner wall surface of the test slot (641). The other end of the spring (642) is connected to a pressure plate (643), and the pressure plate (643) is connected to a guide frame (644) in conjunction with each of the test slots (641).

2. The high-precision non-contact liquid level monitoring device according to claim 1, characterized in that: The guide frame (644) is provided with a plurality of long grooves (6441) on its circumference, for reducing the overall weight of the guide frame (644).

3. The high-precision non-contact liquid level monitoring device according to claim 2, characterized in that: Slide grooves (645) are provided on both sides of the probe (65), and a slider (646) is movably provided in the slide groove (645). A spring 2 (647) is connected between the side of the slide groove (645) away from the probe (65) and the slider (646). A sponge cover (648) is connected to the upper side of the slider (646). A pull rope is connected to the side of the slider (646) facing the probe (65), and the other end of the pull rope extends into the test slot (641) and is connected to the lower surface of the pressure plate (643).

4. The high-precision non-contact liquid level monitoring device according to claim 3, characterized in that: A through hole (649) is provided between the test slot (641) and the slide slot (645) to cooperate with the pull rope. The position of the through hole (649) corresponds to the long slot (6441). An embedding slot (6481) is provided on the side of the sponge cover (648) opposite to the probe (65).

5. The high-precision non-contact liquid level monitoring device according to claim 4, characterized in that: The slider (646) is subjected to the tension of the pull rope, and the elasticity of the spring 1 (642) is greater than the elasticity of the spring 2 (647).

6. The high-precision non-contact liquid level monitoring device according to claim 5, characterized in that: An accordion cover (66) is connected between the slider (646) and the slide groove (645) to prevent foreign objects from getting stuck in the slide groove (645) and affecting the movement of the slider (646).

7. The high-precision non-contact liquid level monitoring device according to claim 6, characterized in that: A support frame (612) is fixed on one side of the mounting frame (61), and a slot is provided on the support frame (612) to cooperate with the swing arm (63). Rotating covers (613) are respectively provided on both sides of the support frame (612) relative to the swing arm (63). One end of the rotating cover (613) is connected to a rotating rod (614), and the rotating rod (614) is rotatably arranged on the surface of the support frame (612). A torsion spring (615) is connected between the rotating rod (614) and the support frame (612). The upper end of the rotating rod (614) is connected to a rocker arm (616), and the other end of the rocker arm (616) is located between the swing arm (63) and the support frame (612).

8. The high-precision non-contact liquid level monitoring device according to claim 7, characterized in that: The movable track (5) is zigzag-shaped and includes a lower platform (51), an inclined platform (52) and an upper platform (53), wherein the two ends of the inclined platform (52) are respectively connected to the lower platform (51) and the upper platform (53), a rack (521) is provided on the lower side of the inclined platform (52), and a sub-plate (67) is connected to the upper side of the mounting frame (61), and a gap is provided between the sub-plate (67) and the mounting frame (61), and a second driver (68) is fixed at both ends of the lower side of the mounting frame (61), and a gear (69) is provided on the driving end of the second driver (68), and the gear (69) is provided between the sub-plate (67) and the mounting frame (61), and the gear (69) cooperates with the corresponding rack (521).

9. The high-precision non-contact liquid level monitoring device according to claim 8, characterized in that: The upper platform (53) is provided with a set of protective components (7) at the lower end thereof in cooperation with the oil pillow (3).

10. The high-precision non-contact liquid level monitoring device according to claim 9, characterized in that: The protective assembly (7) includes a column (71), a movable box (72) is fixed on the column (71), the upper side of the movable box (72) is open, a screw (73) is rotatably provided inside the movable box (72), one end of the screw (73) extends out of the movable box (72) and is connected to a driver (74), a movable block (75) is sleeved on the screw (73), the movable block (75) is threadedly engaged with the screw (73), and a sponge block (76) is connected to the upper side of the movable block (75).

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