High-precision liquid flow measuring method and device

Abstract

The invention belongs to the technical field of flow measurement, and particularly relates to a high-precision liquid flow measurement method and device which comprises a pipeline and a measurement assembly. A mounting pipe is arranged at the bottom of the pipeline; a slag outlet is formed in the bottom of the mounting pipe; the measuring assembly comprises a mounting column; a notch is formed in the top of the mounting column; a groove is formed in the middle of the notch; a mesh enclosure is fixedly connected to the interior of the groove; one end of the mounting column is fixedly connected with a sleeve; the outer side of the sleeve is fixedly connected with a hand wheel; the interior of the sleeve is fixedly connected with a flow meter; and a probe of the flow meter extends into the mesh enclosure. The positions of the mesh enclosure and the probe can be switched by rotating the hand wheel, on one hand, the mesh enclosure can be conveniently replaced or the probe can be conveniently overhauled, and on the other hand, the mesh enclosure is rotated to the outside of the pipeline when the mesh enclosure is cleaned, so that cleaned impurities can be outwards guided out through the slag outlet and cannot return to the inside of the pipeline again, and the cleaning efficiency is improved. And secondary pollution to conveyed liquid is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of flow measurement, and in particular relates to a high-precision liquid flow measurement method and device. Background Art

[0002] When transporting liquids such as oil and water, it is usually necessary to set up a flow meter to monitor its flow rate. However, it is inevitable that there are large and small impurities in the liquid. During the measurement process, the impurities will constantly rub and scratch the surface of the flow meter probe, which will reduce the service life of the probe on the one hand. On the other hand, if some of the more viscous impurities adhere to the probe surface, it will affect the measurement work and seriously reduce the measurement accuracy of the flow meter.

[0003] A Chinese patent application CN114370901A discloses a high-precision liquid flow measurement probe, the technical solution of which is as follows: including a measurement probe body, a rotation protection mechanism, a shaking mechanism, a guide vibration mechanism and multiple shaking mechanisms, a measurement pipeline is provided outside the measurement probe body, and a rotation protection mechanism is provided outside the measurement probe body to reduce the interference of impurities on the measurement probe body, wherein the rotation protection mechanism includes a protective mesh cover, a plurality of fluid blades are connected to the protective mesh cover, and a support bin is connected to the measurement probe body. This technology avoids the possibility of collision between impurities and the flow measurement probe by setting the corresponding mechanism on the flow measurement probe, effectively prevents the probability of the probe being scratched, and improves the service life of the flow measurement probe. At the same time, it avoids the possibility of impurities adhering to the probe, avoids the influence of impurities on the accuracy of the flow measurement probe, effectively improves the precision of the flow measurement probe, and avoids the loss of users.

[0004] However, the above technology often has the following defects: it uses a mesh cover to block impurities in the liquid to prevent the impurities from contacting the probe, but when the mesh cover is cleaned, the impurities on the surface of the mesh cover are directly cleaned into the inside of the pipe, which will cause secondary pollution to the liquid in the pipe, and the fan blades and the mesh cover will interfere with the fluid when rotating, thereby reducing the measurement accuracy of the probe. In addition, it introduces outside air into the pipe, which will cause new pollution to the transported liquid, so its practicality is low.

[0005] To this end, the present invention provides a high-precision liquid flow measurement method and device. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a high-precision liquid flow measurement device described in the present invention comprises a pipeline and a measurement component; A mounting pipe is provided at the bottom of the pipeline; a slag outlet is provided at the bottom of the mounting pipe; the pipeline, the mounting pipe and the slag outlet are interconnected; a sealing cap is threadedly connected to the bottom of the slag outlet; The measuring assembly includes a mounting column; the mounting column is rotatably sealed and connected to the inside of the mounting tube; a notch is provided at the top of the mounting column; a groove is provided in the middle of the notch; a mesh cover is fixedly connected to the inside of the groove; a sleeve is fixedly connected to one end of the mounting column; a handwheel is fixedly connected to the outside of the sleeve; a flow meter is fixedly connected to the inside of the sleeve; and a probe of the flow meter extends to the inside of the mesh cover.

[0008] Preferably, a counterweight ring is slidably connected to the outer side of the mesh cover; and a stopper is fixedly connected to the top of the mesh cover.

[0009] Preferably, a guide plate is provided inside the slag outlet; the guide plate and the counterweight ring are magnetically attracted to each other.

[0010] Preferably, the guide plate is designed to be grid-shaped; a spring 1 and a telescopic rod are fixedly connected between the guide plate and the cover, and the spring 1 is in a compressed state.

[0011] Preferably, an annular cavity is opened inside the mounting column at a position below the mesh cover; an annular plate is slidably connected inside the annular cavity; an elastic member is fixedly connected between the lower side of the annular plate and the annular cavity; a water absorbing member is arranged between the upper side of the annular plate and the annular cavity; a liquid inlet hole and a group of liquid outlet holes are opened between the annular cavity and the groove, and the liquid inlet hole and the liquid outlet hole are respectively located on the outer side and the inner side of the mesh cover; a group of pull ropes are evenly distributed between the counterweight ring and the annular plate.

[0012] Preferably, a portion of the liquid outlet holes are vertically oriented toward the end surface of the mesh cover, and another portion of the liquid outlet holes are inclined toward the side surface of the mesh cover.

[0013] Preferably, the bottom diameter of the liquid inlet hole is larger than the top diameter; a connecting ring is fixedly connected inside the top of the liquid inlet hole; a sealing piece is arranged inside the bottom of the liquid inlet hole; a second spring is fixedly connected between the connecting ring and the sealing piece, and the second spring is in a stretched state; an L-shaped push rod is fixedly connected to the outside of the counterweight ring at the corresponding position of the liquid inlet hole; the push rod is inserted into the interior of the connecting ring and fits with the sealing piece.

[0014] Preferably, a group of upwardly inclined elastic spikes are evenly distributed on the inner side of the counterweight ring; and elastic barbs are fixedly connected to the ends of the elastic spikes.

[0015] A high-precision liquid flow measurement method, which uses the above-mentioned high-precision liquid flow measurement device, comprises the following steps: S1: The flow meter probe is used to measure the liquid flow inside the pipeline, and the impurities in the liquid are blocked by a mesh cover to prevent the impurities from contacting the probe, thereby improving the measurement accuracy of the probe; S2: When it is necessary to clean the impurities on the surface of the mesh cover, the installation column is rotated by the hand wheel so that the notch and the mesh cover are rotated to the inside of the slag outlet below; S3: The counterweight ring moves downward under the action of gravity and magnetic attraction, and slides and scrapes on the side of the mesh cover to scrape away impurities on the side of the mesh cover, and the impurities automatically fall into the inside of the cover; S4: When the counterweight ring moves downward, the pull rope is used to pull the annular plate to slide, and then the annular plate squeezes the liquid inside the water absorbent outward through the liquid outlet hole and flushes the inner wall of the mesh cover to achieve backwashing of the mesh cover; S5: Twist the cover and drive the guide plate to rotate together, so that the guide plate rotates and scrapes on the end surface of the mesh cover to remove impurities on the end surface of the mesh cover; S6: Remove the cover and remove the impurities collected inside.

[0016] The beneficial effects of the present invention are as follows: 1. The high-precision liquid flow measurement method and device described in the present invention can switch the positions of the mesh cover and the probe by turning the hand wheel. On the one hand, it is convenient to replace the mesh cover or repair the probe. On the other hand, when cleaning the mesh cover, the mesh cover is rotated to the outside of the pipeline, and the removed impurities can be discharged outward through the slag outlet without returning to the inside of the pipeline, thereby preventing secondary contamination of the transported liquid. After the installation column is rotated, the pipeline and the slag outlet are completely sealed and separated. Therefore, there is no need to stop transporting the liquid during the cleaning of the mesh cover, which can ensure that the normal transportation process is not affected, thereby improving the work efficiency of liquid transportation.

[0017] 2. The present invention describes a high-precision liquid flow measurement method and device, which provides a counterweight ring. When the mesh cover is rotated downward, the counterweight ring moves downward under the action of gravity, and slides and scrapes on the side of the mesh cover, thereby scraping impurities on the surface of the mesh cover downward, so that the impurities automatically fall into the inside of the cover. The counterweight ring and the guide plate attract each other, which can increase the scraping force of the counterweight ring on the surface of the mesh cover, prevent the counterweight ring from being stuck by impurities, and enhance its cleaning effect on impurities.

[0018] 3. The present invention describes a high-precision liquid flow measurement method and device, in which the guide plate is pressed against the surface of the mounting column under the action of a spring, and when the mesh cover is rotated to face downward, the guide plate can fit against the end face of the mesh cover, and then in the process of twisting the cover, the cover can drive the guide plate to rotate together, so that the guide plate rotates and rubs against the end face of the mesh cover to scrape, thereby removing impurities on the end face of the mesh cover, and cooperating with the counterweight ring to scrape impurities on the side of the mesh cover, thereby realizing all-round automatic cleaning of the mesh cover. Since the guide plate is designed to be in a grid shape, impurities scraped by the guide plate can fall downward through the guide plate, preventing the impurities from always rubbing between the guide plate and the mesh cover and causing damage to the mesh cover. By setting a telescopic rod, the movement of the guide plate is limited, so that the guide plate is always parallel to the end face of the mesh cover and effectively fits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the structure of the measuring device in the present invention; Figure 2 It is a structural schematic diagram of the installation column in the present invention; Figure 3 is a cross-sectional view of the pipeline in the present invention; Figure 4 yes Figure 3 A partial enlarged view of the middle part; Figure 5 yes Figure 4 A partial enlarged view of point B in the middle; Figure 6 It is a schematic flow chart of the measuring method in the present invention.

[0021] In the figure: pipeline 1, mounting pipe 2, slag outlet 3, sealing cover 4, mounting column 5, notch 6, groove 7, mesh cover 8, sleeve 9, hand wheel 10, flow meter 11, probe 12, counterweight ring 13, block 14, guide plate 15, spring 16, telescopic rod 17, annular cavity 18, annular plate 19, elastic member 20, water absorbing member 21, liquid inlet hole 22, liquid outlet hole 23, pull rope 24, connecting ring 25, sealing piece 26, spring 27, push rod 28, elastic thorn 29, elastic barb 30. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0023] like Figures 1 to 5 As shown, a high-precision liquid flow measurement device according to the present invention comprises a pipeline 1 and a measurement component; The bottom of the pipeline 1 is provided with a mounting pipe 2; the bottom of the mounting pipe 2 is provided with a slag outlet 3; the pipeline 1, the mounting pipe 2, and the slag outlet 3 are interconnected; the bottom of the slag outlet 3 is threadedly connected with a sealing cover 4; The measuring assembly includes a mounting column 5; the mounting column 5 is rotatably sealed and connected to the inside of the mounting tube 2; a notch 6 is provided at the top of the mounting column 5; a groove 7 is provided in the middle of the notch 6; a mesh cover 8 is fixedly connected to the inside of the groove 7; a sleeve 9 is fixedly connected to one end of the mounting column 5; a hand wheel 10 is fixedly connected to the outside of the sleeve 9; a flow meter 11 is fixedly connected to the inside of the sleeve 9; and a probe 12 of the flow meter 11 extends to the inside of the mesh cover 8.

[0024] The technology disclosed in CN114370901A-a high-precision liquid flow measurement probe 12 uses a mesh cover 8 to block impurities in the liquid to prevent the impurities from contacting the probe 12. However, when the mesh cover 8 is cleaned, the impurities on the surface of the mesh cover 8 are directly cleaned into the inside of the pipe 1, which will cause secondary pollution to the liquid in the pipe 1, and the fan blades and the mesh cover 8 will interfere with the fluid when rotating, thereby reducing the measurement accuracy of the probe 12. In addition, it introduces external air into the inside of the pipe 1, which will cause new pollution to the transported liquid, so its practicality is relatively low.

[0025] When conveying liquid, the present invention measures the liquid flow inside the pipeline 1 through the probe 12 of the flowmeter 11, and uses the mesh cover 8 to be sleeved on the outside of the probe 12 to filter impurities in the liquid, thereby preventing the impurities from directly contacting the probe 12, avoiding the impurities from rubbing and colliding with the probe 12 and causing damage to the probe 12, and also preventing the impurities from adhering to the surface of the probe 12 and blocking its detection end, thereby ensuring the high measurement accuracy of the probe 12. When it is necessary to clean the impurities accumulated on the surface of the mesh cover 8, the mounting column 5 is rotated by the hand wheel 10, so that the notch 6 and the mesh cover 8 are rotated to the inside of the slag outlet 3 below, and then the cover 4 is unscrewed to clean the impurities outside the mesh cover 8.

[0026] The present invention can realize the switching of the positions of the mesh cover 8 and the probe 12 by rotating the hand wheel 10. On the one hand, it is convenient to replace the mesh cover 8 or to inspect and repair the probe 12. On the other hand, when cleaning the mesh cover 8, the mesh cover 8 is rotated to the outside of the pipeline 1, and then the removed impurities can be discharged to the outside through the slag outlet 3 without returning to the inside of the pipeline 1, thereby preventing secondary contamination of the conveyed liquid. After the installation column 5 is rotated, the pipeline 1 and the slag outlet 3 are completely sealed and separated. Therefore, there is no need to stop conveying liquid during the process of cleaning the mesh cover 8, which can ensure that the normal conveying process is not affected, thereby improving the working efficiency of liquid conveying.

[0027] As a preferred embodiment of the present invention, a weight ring 13 is slidably connected to the outside of the mesh cover 8; and a stopper 14 is fixedly connected to the top of the mesh cover 8. By providing the weight ring 13, when the mesh cover 8 is rotated to face downward, the weight ring 13 moves downward under the action of gravity, and slides and scrapes on the side of the mesh cover 8, thereby scraping impurities on the surface of the mesh cover 8 downward, so that the impurities automatically fall into the inside of the cover 4, and the weight ring 13 is blocked by the stopper 14 to prevent the weight ring 13 from separating from the mesh cover 8, and the cover 4 can be removed later and the impurities inside it can be removed.

[0028] As a preferred embodiment of the present invention, a guide plate 15 is provided inside the slag outlet 3; the guide plate 15 and the counterweight ring 13 are magnetically attracted to each other. When the mesh cover 8 is rotated downward, the counterweight ring 13 moves downward under the suction force of the guide plate 15 and its own weight, thereby increasing the scraping force of the counterweight ring 13 on the surface of the mesh cover 8, preventing the counterweight ring 13 from being stuck by impurities, and enhancing its cleaning effect on impurities.

[0029] The guide plate 15 is designed to be in a grid shape; a spring 16 and a telescopic rod 17 are fixedly connected between the guide plate 15 and the cover 4, and the spring 16 is in a compressed state. The guide plate 15 is pressed against the surface of the mounting column 5 under the action of the spring 16. When the net cover 8 is rotated to face downward, the guide plate 15 can fit the end face of the net cover 8, and then the cover 4 can drive the guide plate 15 to rotate together in the process of twisting the cover 4, so that the guide plate 15 rotates and rubs and scrapes the end face of the net cover 8, thereby removing impurities on the end face of the net cover 8, and scraping impurities on the side of the net cover 8 with the counterweight ring 13, realizing all-round automatic cleaning of the net cover 8. Since the guide plate 15 is designed to be in a grid shape, the impurities scraped by the guide plate 15 can fall downward through the guide plate 15, preventing the impurities from always rubbing between the guide plate 15 and the net cover 8 and causing damage to the net cover 8. By setting the telescopic rod 17, the movement of the guide plate 15 is limited, so that the guide plate 15 is always parallel to the end face of the net cover 8 and effectively fits.

[0030] As a preferred embodiment of the present invention, an annular cavity 18 is opened inside the mounting column 5 at a position below the mesh cover 8; an annular plate 19 is slidably connected inside the annular cavity 18; an elastic member 20 is fixedly connected between the lower side of the annular plate 19 and the annular cavity 18; a water-absorbing member 21 is arranged between the upper side of the annular plate 19 and the annular cavity 18, and the material of the water-absorbing member 21 can be sponge, foam, absorbent cloth, etc.; a liquid inlet hole 22 and a group of liquid outlet holes 23 are opened between the annular cavity 18 and the groove 7, and the liquid inlet hole 22 and the liquid outlet hole 23 are respectively located on the outer side and the inner side of the mesh cover 8; a group of pull ropes 24 are evenly distributed between the counterweight ring 13 and the annular plate 19. During the transportation process, the liquid inside the pipeline 1 can enter the annular cavity 18 through the liquid inlet hole 22 and be absorbed by the water absorbing member 21, so that the water absorbing member 21 is filled with liquid. When the mesh cover 8 is rotated to face downward, the counterweight ring 13 moves downward and uses the pull rope 24 to pull the annular plate 19 to slide inside the annular cavity 18, and then the annular plate 19 squeezes the water absorbing member 21, and squeezes the liquid inside the water absorbing member 21 outward through the liquid outlet hole 23, and flushes the inner wall of the mesh cover 8, thereby realizing backwashing of the mesh cover 8, which is beneficial to flush out impurities on the surface of the mesh cover 8 and inside its holes.

[0031] Part of the liquid outlet holes 23 are vertically oriented toward the end surface of the mesh cover 8, and the other part of the liquid outlet holes 23 are inclined toward the side surface of the mesh cover 8. By providing the liquid outlet holes 23 in different directions, when the liquid in the water absorbing member 21 is squeezed outward through the liquid outlet holes 23, it can impact the inner wall of the end surface and the inner wall of the side surface of the mesh cover 8 along different paths, thereby expanding the flushing area of ​​the mesh cover 8 and further improving the cleaning uniformity of the mesh cover 8.

[0032] As a preferred embodiment of the present invention, the bottom diameter of the liquid inlet hole 22 is larger than the top diameter; a connecting ring 25 is fixedly connected inside the top of the liquid inlet hole 22; a sealing piece 26 is arranged inside the bottom of the liquid inlet hole 22; a spring 27 is fixedly connected between the connecting ring 25 and the sealing piece 26, and the spring 27 is in a stretched state; an L-shaped push rod 28 is fixedly connected to the outside of the counterweight ring 13 at the corresponding position of the liquid inlet hole 22; the push rod 28 is inserted into the connecting ring 25 and fits with the sealing piece 26. When the mesh cover 8 is facing upward, the counterweight ring 13 is located at the bottom of the mesh cover 8 under the action of its own weight and suction, and uses the push rod 28 to press the sealing piece 26 downward, so that a gap is formed between the sealing piece 26 and the liquid inlet hole 22, and then the liquid inside the pipeline 1 can enter the water absorbing member 21 through the liquid inlet hole 22. When the mesh cover 8 is rotated to face downward, the counterweight ring 13 drives the push rod 28 to move downward and separate it from the blocking piece 26, and then the spring 27 tightens the blocking piece 26 and closes the liquid inlet hole 22. At this time, when the water absorbing member 21 is squeezed, the liquid inside it can only be discharged through the liquid outlet hole 23 but not through the liquid inlet hole 22, thereby ensuring the liquid outlet pressure and liquid outlet volume of the liquid outlet hole 23, thereby improving the backwashing efficiency of the mesh cover 8.

[0033] As a preferred embodiment of the present invention, a group of upwardly inclined elastic spikes 29 are evenly distributed on the inner side of the counterweight ring 13; and elastic barbs 30 are fixedly connected to the ends of the elastic spikes 29. By providing the elastic spikes 29, when the counterweight ring 13 is scraping the outer side of the mesh cover 8, the elastic spikes 29 can be inserted into the holes of the mesh cover 8, and then when the elastic spikes 29 leave the holes, the elastic barbs 30 can be used to bring out the impurities in the holes, thereby clearing the holes of the mesh cover 8 and further improving the separation efficiency between the impurities and the mesh cover 8.

[0034] It is worth noting that if it is found that the mesh cover 8 is not cleaned completely by the above operation after opening the cover 4, the mesh cover 8 can be manually cleaned by brushing, flushing, etc.

[0035] like Figure 6 As shown, a high-precision liquid flow measurement method according to the present invention adopts the above-mentioned high-precision liquid flow measurement device, and comprises the following steps: S1: The liquid flow rate inside the pipe 1 is measured by the probe 12 of the flow meter 11, and the impurities in the liquid are blocked by the mesh cover 8 to prevent the impurities from contacting the probe 12, thereby improving the measurement accuracy of the probe 12; S2: When it is necessary to clean the impurities on the surface of the mesh cover 8, the mounting column 5 is rotated by the hand wheel 10 so that the notch 6 and the mesh cover 8 are rotated to the inside of the slag outlet 3 below; S3: The counterweight ring 13 moves downward under the action of gravity and magnetic attraction, and slides and scrapes the side of the mesh cover 8 to scrape away impurities on the side of the mesh cover 8, and the impurities automatically fall into the inside of the cover 4; S4: When the counterweight ring 13 moves downward, the pull rope 24 is used to pull the annular plate 19 to slide, and then the annular plate 19 squeezes the liquid inside the water absorbing member 21 outward through the liquid outlet 23 and washes the inner wall of the mesh cover 8, thereby realizing backwashing of the mesh cover 8; S5: Twist the cover 4 and drive the guide plate 15 to rotate together, so that the guide plate 15 rotates and scrapes the end surface of the mesh cover 8 to remove impurities on the end surface of the mesh cover 8; S6: Remove the cover 4 and remove the impurities collected inside it.

[0036] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-precision liquid flow measurement device, characterized in that: comprising a pipeline (1) and a measuring assembly; A mounting pipe (2) is arranged at the bottom of the pipeline (1); a slag outlet (3) is arranged at the bottom of the mounting pipe (2); the pipeline (1), the mounting pipe (2) and the slag outlet (3) are interconnected; a sealing cover (4) is threadedly connected to the bottom of the slag outlet (3); The measuring assembly comprises a mounting column (5); the mounting column (5) is rotatably sealed and connected to the inside of the mounting tube (2); a notch (6) is provided at the top of the mounting column (5); a groove (7) is provided in the middle of the notch (6); a mesh cover (8) is fixedly connected to the inside of the groove (7); a sleeve (9) is fixedly connected to one end of the mounting column (5); a hand wheel (10) is fixedly connected to the outside of the sleeve (9); a flow meter (11) is fixedly connected to the inside of the sleeve (9); and a probe (12) of the flow meter (11) extends to the inside of the mesh cover (8).

2. A high-precision liquid flow measurement device according to claim 1, characterized in that: A counterweight ring (13) is slidably connected to the outside of the mesh cover (8); and a stopper (14) is fixedly connected to the top of the mesh cover (8).

3. A high-precision liquid flow measurement device according to claim 2, characterized in that: A guide plate (15) is provided inside the slag outlet (3); the guide plate (15) and the counterweight ring (13) are magnetically attracted to each other.

4. A high-precision liquid flow measurement device according to claim 3, characterized in that: The guide plate (15) is designed to be in a grid shape; a spring (16) and a telescopic rod (17) are fixedly connected between the guide plate (15) and the cover (4), and the spring (16) is in a compressed state.

5. A high-precision liquid flow measurement device according to claim 4, characterized in that: An annular cavity (18) is provided inside the mounting column (5) at a position below the mesh cover (8); an annular plate (19) is slidably connected inside the annular cavity (18); an elastic member (20) is fixedly connected between the lower side of the annular plate (19) and the annular cavity (18); a water absorbing member (21) is provided between the upper side of the annular plate (19) and the annular cavity (18); a liquid inlet hole (22) and a group of liquid outlet holes (23) are provided between the annular cavity (18) and the groove (7), and the liquid inlet hole (22) and the liquid outlet hole (23) are respectively located on the outer side and the inner side of the mesh cover (8); and a group of pull ropes (24) are evenly distributed between the counterweight ring (13) and the annular plate (19).

6. A high-precision liquid flow measurement device according to claim 5, characterized in that: A portion of the liquid outlet holes (23) are vertically oriented toward the end surface of the mesh cover (8), and another portion of the liquid outlet holes (23) are inclined toward the side surface of the mesh cover (8).

7. A high-precision liquid flow measurement device according to claim 6, characterized in that: The bottom diameter of the liquid inlet hole (22) is larger than the top diameter; a connecting ring (25) is fixedly connected inside the top of the liquid inlet hole (22); a blocking piece (26) is provided inside the bottom of the liquid inlet hole (22); a second spring (27) is fixedly connected between the connecting ring (25) and the blocking piece (26), and the second spring (27) is in a stretched state; an L-shaped push rod (28) is fixedly connected to the outside of the counterweight ring (13) at a position corresponding to the liquid inlet hole (22); the push rod (28) is inserted into the inside of the connecting ring (25) and fits with the blocking piece (26).

8. A high-precision liquid flow measurement device according to claim 7, characterized in that: A group of upwardly inclined elastic spikes (29) are evenly distributed on the inner side of the counterweight ring (13); elastic barbs (30) are fixedly connected to the ends of the elastic spikes (29).

9. A high-precision liquid flow measurement method, the method using the high-precision liquid flow measurement device according to claim 8, characterized in that: The following steps are involved: S1: measuring the flow rate of the liquid inside the pipeline (1) by means of a probe (12) of a flow meter (11), and using a mesh cover (8) to block impurities in the liquid to prevent the impurities from contacting the probe (12), thereby improving the measurement accuracy of the probe (12); S2: When it is necessary to clean impurities on the surface of the mesh cover (8), the mounting column (5) is rotated by means of the hand wheel (10) so that the notch (6) and the mesh cover (8) are rotated to the inside of the slag outlet (3) below; S3: The counterweight ring (13) moves downward under the action of gravity and magnetic attraction, and slides and scrapes the side of the mesh cover (8), scraping away impurities on the side of the mesh cover (8), and the impurities automatically fall into the interior of the cover (4).

10. A high-precision liquid flow measurement method according to claim 9, characterized in that: This method also The following steps are involved: S4: When the counterweight ring (13) moves downward, the pull rope (24) is used to pull the annular plate (19) to slide, and then the annular plate (19) squeezes the liquid inside the water absorbing member (21) outward through the liquid outlet hole (23) and flushes the inner wall of the mesh cover (8), thereby achieving backwashing of the mesh cover (8); S5: twisting the cover (4) and driving the guide plate (15) to rotate together, so that the guide plate (15) rotates and rubs against the end surface of the mesh cover (8) to remove impurities on the end surface of the mesh cover (8); S6: Remove the cover (4) and remove the impurities collected inside.

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