An overflow density sensor

Abstract

The present application relates to the technical field of density sensor, particularly relates to an overflow type density sensor, which comprises a measuring tube, the upper end of the measuring tube is fixedly installed with an overflow weir for liquid overflow, the side of the measuring tube is provided with a fixed density detector near the lower position, and the outer side of the measuring tube is provided with a mounting cap wrapping the overflow weir near the upper position. The second locking screw column is screwed, so that the measuring tube and the rotating ball are rigidly locked, the posture is fixed, the leveling process ensures that the constant measuring liquid level surface physically locked by the overflow weir is in a horizontal state, and then the vertical height difference between the two pressure taking points of the density detector is kept at a design value. The design converts the complex field installation reference calibration problem into a simple mechanical leveling and locking operation, so that the instrument can obtain the measuring reference accuracy on various complex pipeline layouts, and effectively solves the systematic measurement error caused by the installation inclination of the traditional sensor.

Description

Technical Field

[0001] This invention relates to the field of density sensor technology, and in particular to an overflow density sensor. Background Technology

[0002] Online liquid density measurement is crucial for the control and optimization of industrial processes such as chemical engineering, mining, and water treatment. Currently, the mainstream online density meters are instruments based on the differential pressure principle.

[0003] In practical industrial applications, a series of long-standing pain points remain unresolved. Firstly, traditional fixed-installation sensors have extremely strict requirements on the installation posture of the pipeline, ensuring it is vertical; otherwise, uncorrectable systematic errors will be introduced. In complex industrial piping systems, finding the ideal installation location and accurately leveling it is often very difficult, leading to inaccurate measurement references. Industrial slurries or concentrates often contain solid particles, which easily deposit and scale in the sensor inlet and measuring chamber. This can cause slow measurement response and data distortion, or even complete blockage of the flow channel, rendering the instrument inoperable. Significant fluid interference is also present; air bubbles entrained in the liquid severely interfere with static pressure measurements, resulting in persistently low and drastically fluctuating density readings. Traditional static measuring chambers lack active venting methods, making it difficult to completely eliminate the air bubble interference problem. Therefore, we propose an overflow-type density sensor. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides an overflow density sensor.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A measuring tube is included, with an overflow weir fixedly installed at the upper end for liquid overflow. A fixed density detector is installed on the lower side of the measuring tube. An installation cap covering the overflow weir is installed on the upper side of the measuring tube. Two guide holes communicating with the outside air are opened at the upper end of the installation cap. The density detector is installed on the lower side of the measuring tube. A clamping structure for fixing the measuring tube is installed below the measuring tube. A connecting structure for adjusting the angle of the measuring tube is provided between the measuring tube and the clamping structure. A movable cylinder is installed inside the measuring tube. A stirring structure is installed below the movable cylinder. A universal coupling is provided between the movable cylinder and the stirring structure. The lower end of the movable cylinder is fixedly installed at one end of the universal coupling. A connecting pipe is fixedly installed at the lower end of the installation cap.

[0006] As a preferred embodiment of the present invention, the clamping structure includes a guide block, which is fixedly installed on the bottom side of the connecting structure. The guide block is an arc-shaped block, and rotating blocks are movably installed at both ends of the guide block. Connecting sleeves are fixedly installed on the bottom sides of the two rotating blocks. Guide pull blocks are provided inside the two connecting sleeves. A first locking threaded hole is opened on the side of the guide pull block, and a first locking threaded post is threadedly connected inside the first locking threaded hole.

[0007] As a preferred embodiment of the present invention, the connection structure includes a guide tube fixedly installed on the upper end of the guide block, a rotating ball fixedly installed on the upper end of the guide tube, and a process rotating ball, a guide tube, and a liquid inlet hole of the guide block opened on the end face of the rotating ball. A rotating cavity is opened on the inner side of the measuring tube, and the rotating ball is rotatably installed inside the rotating cavity. A second locking threaded hole is opened on the side of the measuring tube corresponding to the position of the rotating cavity, and a second locking threaded post is threadedly connected inside the second locking threaded hole.

[0008] As a preferred embodiment of the present invention, the stirring structure includes a connecting column fixedly installed on a universal coupling at the end away from the movable cylinder. A rectangular groove is provided at the lower end of the connecting column. A sliding rod is slidably installed in the rectangular groove at the lower end of the connecting column. A spring is fixedly installed at the upper end of the sliding rod. The upper end of the spring is fixedly installed in the rectangular groove at the lower end of the connecting column. Several stirring plates are fixedly installed on the outer side of the connecting column near the lower part. A stirring rod is fixedly installed at the lower end of the sliding rod. A detachable connecting ball is provided at the lower end of the stirring rod.

[0009] As a preferred embodiment of the present invention, two fixing rods are fixedly installed on the inner side of the guide tube, and a limiting cylinder is fixedly installed on one side of the two fixing rods corresponding to each other, with the connecting column disposed inside the limiting cylinder.

[0010] As a preferred embodiment of the present invention, the inner side of the measuring tube is provided with a plurality of spiral guide grooves, the spiral guide grooves being spirally upward grooves, and rotating paddles are fixedly installed at equal intervals on the outer side of the movable cylinder corresponding to the positions of the spiral guide grooves.

[0011] As a preferred embodiment of the present invention, a splined cylinder is fixedly installed at the upper end of the movable cylinder, a rotating tooth is slidably connected to the outer side of the splined cylinder, a fixed mounting bracket is provided on the upper side of the mounting cap, the rotating tooth is rotatably installed on the upper side of the mounting bracket, a telescopic device is fixedly installed on the upper side of the movable cylinder, a mounting block is fixedly installed at the output end of the telescopic device, the mounting block is rotatably installed on the splined cylinder, a fixed block is fixedly installed on the upper side of the mounting cap, a rotating tooth is fixedly installed on the side of the fixed block, and an adapter gear that meshes with the rotating tooth is fixedly installed at the output end of the rotating tooth.

[0012] As a preferred embodiment of the present invention, the side of the movable cylinder is provided with a number of exhaust holes from bottom to top, and each set of exhaust holes consists of a number of air guide holes equidistantly opened on the outside of the movable cylinder.

[0013] Compared with the prior art, the beneficial effects that this invention can achieve are: 1. This invention, through the connection and leveling effect of the guide block, rotating ball, and second locking threaded column, works in conjunction with the core overflow weir and density detector to achieve rapid and accurate installation and calibration on non-ideal pipelines. The arc-shaped guide block and retractable guide pull block in the clamping structure allow the device to quickly clamp pipelines of different diameters. Even if the pipeline itself is not vertical, the operator can manually adjust the measuring tube, allowing it to swing freely around the rotating ball through the internal rotating cavity until it is confirmed to be in a strictly vertical state by an external level. Tightening the second locking threaded column rigidly locks the measuring tube and rotating ball, completing the posture fixation. This leveling process ensures that the constant measuring liquid level surface, physically locked by the overflow weir, is in a horizontal state, thereby maintaining the vertical height difference between the two pressure taps of the density detector at the design value. This design transforms the complex on-site installation benchmark calibration problem into a simple mechanical leveling and locking operation, enabling the instrument to obtain measurement benchmark accuracy in various complex pipeline layouts, effectively solving the systematic measurement error caused by the installation tilt of traditional sensors.

[0014] 2. This invention utilizes a flexible stirring and unblocking structure comprised of a movable cylinder, a universal coupling, a connecting column, and a spring-loaded sliding rod. This structure, in conjunction with the lower stirring plate and stirring rod, effectively prevents blockages at the inlet of high-concentration, easily settling media. When the driving component rotates the movable cylinder via the splined cylinder, the torque is transmitted to the connecting column through the universal coupling. This drives the lower stirring plate and stirring rod to form a rotating shear flow field in the inlet area at the bottom of the measuring tube. This flow field continuously agitates the medium, preventing solid particle deposition. The connecting column and sliding rod are flexibly connected by a spring. During the stirring process, the connecting ball at the end of the stirring rod, under the combined effect of the medium resistance, its own weight, and the spring tension, will generate axial reciprocating motion while rotating, thus forming a compound unblocking action of rotational impact. This has an excellent destructive effect on the soft deposits that have already formed. By pushing the entire movable cylinder through the telescopic device, the connecting ball can also be driven downward to directly block the liquid inlet, achieving temporary isolation. This realizes the routine maintenance of the most easily blocked link, ensuring that the measuring medium flows continuously and stably into the measuring chamber, and avoiding measurement interruption or distortion caused by material blockage.

[0015] 3. This invention utilizes a spiral guide groove on the inner wall of the measuring tube and a rotating paddle mounted on the movable cylinder to form a highly efficient gas-liquid cyclone separation system. This system actively eliminates the interference of air bubbles on static pressure measurement. As the rotating paddle rotates with the movable cylinder, it drives the liquid inside the measuring tube to form a forced cyclone, generating a centrifugal force field. Under the action of centrifugal force, the less dense air bubbles are thrown towards the tube wall area and, under the constraint and guidance of the spiral guide groove, are accelerated upward along the spiral path. Finally, they are carried out by the liquid at the overflow weir. The strong shear flow field causes the tiny air bubbles to collide and coalesce into larger air bubbles, further improving the upward separation speed. This design transforms the traditional static measuring chamber into a dynamic centrifugal separator, enhancing the effect of passive buoyancy separation through active mechanical force. It can efficiently remove free air bubbles and some dissolved gases entrained in the liquid, thereby ensuring that the fluid environment in which the density detector is located is a homogeneous single-phase liquid. This ensures that the measured static pressure difference strictly corresponds to the liquid density, significantly improving the accuracy and stability of the readings.

[0016] 4. This invention forms a cleaning system by connecting the airflow channel and side wall air guide holes of the splined cylinder and the movable cylinder, which cooperate with the guide holes on the mounting cap. When cleaning is required, the clamping structure is reversed, and high-pressure gas is introduced through the splined cylinder. The airflow passes through the cavity inside the movable cylinder and is radially ejected from multiple sets of air guide holes on its side, forming a high-speed air sweeping flow around the movable cylinder. This forcefully washes the inner wall of the measuring tube and the spiral guide groove, removing the attached dirt or crystals. Subsequently, cleaning liquid is injected, carrying the flushed impurities up to the cavity of the mounting cap, and finally discharged from the system through two high-level guide holes, ensuring the cleanliness and measuring performance of the system during long-term operation.

[0017] 5. The device of this invention uses a movable cylinder as the actuating shaft. Its upper end is connected to a splined cylinder to receive rotation and lifting drive, and its lower end drives the stirring and unblocking structure through a universal coupling. The combined action of a single drive source rotary motor and expansion joint can trigger a variety of maintenance actions such as anti-blocking and unblocking, swirling degassing, and cleaning and sealing simultaneously or at different times. These actions do not interfere with the essential measurement process completed by the overflow weir and density detector, but create stable measurement conditions for them. Stirring ensures the flow of the medium, swirling ensures the homogeneity of the fluid, cleaning ensures the smoothness of the inner wall, and leveling ensures the measurement benchmark, thereby effectively dealing with the complex media conditions and installation environment in industrial sites. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side sectional view of the measuring tube of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the fixing block structure of the present invention; Figure 5 This is a schematic diagram of the movable cylinder structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B; Figure 7 For the present invention Figure 5 Enlarged structural diagram at point C; Figure 8 For the present invention Figure 5 Enlarged structural diagram at point D.

[0019] Wherein: 111, Measuring tube; 112, Density detector; 113, Mounting cap; 114, Overflow weir; 115, Guide hole; 116, Connecting tube; 121, Rotating cavity; 122, Rotating ball; 123, Guide tube; 211, Guide block; 212, Rotating block; 213, Connecting sleeve; 214, Guide pull block; 215, First locking threaded hole; 216, First locking threaded post; 311, Movable cylinder; 312, Universal coupling; 321, Second locking threaded hole; 3 22. Second locking threaded post; 411. Connecting post; 412. Sliding rod; 413. Spring; 414. Stirring plate; 415. Stirring rod; 421. Connecting ball; 431. Limiting cylinder; 432. Fixing rod; 511. Spiral guide groove; 512. Rotating paddle; 521. Air guide hole; 611. Splined cylinder; 612. Rotating gear; 613. Mounting bracket; 614. Expansion joint; 615. Mounting block; 616. Fixing block; 617. Rotary motor; 618. Adaptive gear. Detailed Implementation

[0020] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0021] Example: Figures 1 to 8As shown, an overflow density sensor includes a measuring tube 111. An overflow weir 114 for liquid overflow is fixedly installed at the upper end of the measuring tube 111. A density detector 112 is fixedly installed on the side of the measuring tube 111 near the lower part. A mounting cap 113 covering the overflow weir 114 is installed on the outer side of the measuring tube 111 near the upper part. Two guide holes 115 communicating with the outside air are opened at the upper end of the mounting cap 113. The density detector 112 is installed on the side of the measuring tube 111 near the lower part. A clamping structure for fixing the measuring tube 111 is provided below the measuring tube 111. The clamping structure includes a guide block 211, which is fixedly installed on the bottom side of the connecting structure. The guide block 211 is arc-shaped. The guide block 211 has rotating blocks 212 movably mounted at both ends. Connecting sleeves 213 are fixedly mounted on the bottom sides of the two rotating blocks 212. Guide pull blocks 214 are provided inside the two connecting sleeves 213. A first locking threaded hole 215 is opened on the side of the guide pull block 214. A first locking threaded post 216 is threadedly connected inside the first locking threaded hole 215. A connecting structure for adjusting the angle of the measuring tube 111 is provided between the measuring tube 111 and the clamping structure. The connecting structure includes a guide tube 123 fixedly mounted on the upper end of the guide block 211. A rotating ball 122 is fixedly mounted on the upper end of the guide tube 123. The end face of the rotating ball 122 has a process rotating ball 122, a guide tube 123, and a liquid inlet hole of the guide block 211. A rotating cavity 121 is formed on the inner side of the measuring tube 111. A rotating ball 122 is rotatably installed inside the rotating cavity 121. A second locking threaded hole 321 is formed on the side of the measuring tube 111 corresponding to the position of the rotating cavity 121. A second locking threaded post 322 is threadedly connected inside the second locking threaded hole 321. A movable cylinder 311 is set inside the measuring tube 111. A stirring structure is set below the movable cylinder 311. A universal coupling 312 is set between the movable cylinder 311 and the stirring structure. The lower end of the movable cylinder 311 is fixedly installed on one end of the universal coupling 312. A connecting pipe 116 is fixedly installed on the lower end of the mounting cap 113. A splined cylinder 611 is fixedly installed on the upper end of the movable cylinder 311. The outer side of the splined cylinder 611 is slidably connected to... A rotating gear 612 is connected to the upper side of the mounting cap 113, and a fixed mounting bracket 613 is provided on the upper side of the mounting bracket 613. The rotating gear 612 is rotatably mounted on the upper side of the mounting bracket 613. A telescopic device 614 is fixedly mounted on the upper side of the movable cylinder 311. A mounting block 615 is fixedly mounted on the output end of the telescopic device 614. The mounting block 615 is rotatably mounted on the splined cylinder 611. A fixing block 616 is fixedly mounted on the upper side of the mounting cap 113. A rotating gear 612 is fixedly mounted on the side of the fixing block 616. A matching gear 618 that meshes with the rotating gear 612 is fixedly mounted on the output end of the rotating gear 612. Several sets of exhaust holes are arranged sequentially from bottom to top on the side of the movable cylinder 311. Each set of exhaust holes consists of several air guide holes 521 that are equidistantly opened on the outer side of the movable cylinder 311.

[0022] More specifically, the measuring tube 111 is installed on the side of the pipe using a clamping structure, and the measuring tube 111 is adjusted to a vertical position using a connecting structure. When density needs to be measured, liquid enters the measuring tube 111 through the connecting structure. After the measuring tube 111 is full of liquid, excess liquid overflows evenly over the overflow weir 114, physically locking the liquid level to a constant value. At this point, the pressure difference between the two pressure taps is only related to the density, and the density of the liquid can be detected by the density detector 112. During use, the movable cylinder 311 is rotated. The movable cylinder 311 rotates with the stirring structure via the universal coupling 312 to prevent concentrated liquid from clogging the inlet and causing poor liquid flow, which would affect density detection. The guide block 211 is attached to the inner wall of the pipe. The guide block 211, guide pull block 214, and two rotating blocks 212 provide a stimulating wrap around the pipe. Then, the first locking threaded post 216 is rotated, pressing against the side wall of the pipe to fix the device. After the clamping structure is installed, it is found that the clamping structure is installed crookedly. At this time, the measuring tube 111 swings on the rotating ball 122 through the rotating cavity 121, making the measuring tube 111 vertical. Then, the measuring tube 111 is locked by rotating the second locking threaded post 322. The locking action is performed by fine adjustment. The rotating motor 617 causes the adapter gear 618 to rotate, the adapter gear 618 drives the rotating gear 612 to rotate, the rotating gear 612 drives the splined cylinder 611 to rotate, the splined cylinder 611 drives the movable cylinder 311 to rotate, and the telescopic device 614 drives the mounting block 615 and the splined cylinder 611 to rotate. The splined cylinder 611 moves up and down, driving the movable cylinder 311 to move up and down. The clamping structure fits the device onto the outside of the pipe. High-pressure gas is blown into the splined cylinder 611. The airflow enters the movable cylinder 311 along with the splined cylinder 611 and is then ejected through the air guide hole 521 on the outside of the movable cylinder 311. The high-pressure airflow cleans the inner wall of the measuring tube 111. After cleaning, cleaning fluid is poured into one end of the measuring tube 111. The cleaning fluid, carrying impurities, moves into the mounting cap 113 and is then discharged out through the guide hole 115.

[0023] like Figure 3 , Figure 5 , Figure 7 and Figure 8As shown, specifically, the stirring structure includes a connecting column 411 fixedly installed on the universal coupling 312 at the end away from the movable cylinder 311. A rectangular groove is provided at the lower end of the connecting column 411. A sliding rod 412 is slidably installed in the rectangular groove at the lower end of the connecting column 411. A spring 413 is fixedly installed at the upper end of the sliding rod 412. The upper end of the spring 413 is fixedly installed in the rectangular groove at the lower end of the connecting column 411. Several stirring plates 414 are fixedly installed on the outer side of the connecting column 411 near the lower part. A stirring rod 415 is fixedly installed at the lower end of the sliding rod 412. A detachable connecting ball 421 is provided at the lower end of the stirring rod 415. Two fixing rods 432 are fixedly installed on the inner side of the guide tube 123. A limiting cylinder 431 is fixedly installed on one side of the two fixing rods 432 corresponding to each other. The connecting column 411 is located inside the limiting cylinder 431.

[0024] More specifically, the movable cylinder 311 drives the universal coupling 312 to rotate, the universal coupling 312 drives the connecting column 411 to rotate, the connecting column 411 drives the sliding rod 412 and the agitating rod 415 to rotate, the connecting column 411 drives the agitating plate 414 to rotate, and the sliding rod 412 drives the agitating rod 415 to rotate. When the agitating plate 414 and the agitating rod 415 rotate, they can agitate and clear the high-density liquid at the feed inlet. When the agitating rod 415 drives the connecting ball 421 to rotate, the sliding rod 412 acts as a counterweight, and under the influence of gravity, it pulls the agitating rod 415 and the sliding rod 412. Downward, during the rotation of the sliding rod 412, the pulling of the spring 413 and the impact of the liquid cause the sliding rod 412 to pull the spring 413 up and down inside the connecting column 411, improving the unblocking effect. The movable cylinder 311 moves downward, and the movable cylinder 311 moves the connecting column 411 downward. The connecting column 411 moves the connecting ball 421 upward. The connecting ball 421 blocks the lower end of the liquid inlet. The limiting cylinder 431 guides the movement of the connecting column 411, so that the connecting column 411 can only work in a vertical state under the constraint of the limiting cylinder 431.

[0025] like Figure 6 As shown, specifically, the inner side of the measuring tube 111 is provided with several spiral guide grooves 511, the spiral guide grooves 511 are spiral upward grooves, and the outer side of the movable cylinder 311 is fixedly installed with rotating paddles 512 at equal intervals corresponding to the positions of the spiral guide grooves 511.

[0026] More specifically, the movable cylinder 311 rotates with the rotating paddle 512, which causes the liquid inside the measuring tube 111 to rotate. When the rotating paddle 512 is activated, the liquid forms a vortex, and bubbles gather towards the axis under the action of centrifugal force. Tiny bubbles collide in the shear flow and merge into large bubbles. The large bubbles concentrated at the axis form an air column and are discharged at high speed from the center area of ​​the liquid surface. Bubbles that are attached to the wall or slightly further away are captured by the spiral guide groove 511 and quickly guided to the top along the wall for discharge, thereby reducing the impact of bubbles on the detection effect.

[0027] Working principle: The operator first uses the clamping structure formed by the guide block 211 and the guide pull block 214 to hold the device tightly on the process pipeline. Then, the operator manually adjusts the measuring tube 111 so that it swings around the rotating ball 122 through the lower rotating cavity 121 until it is confirmed to be vertical with the help of a level. Finally, the second locking thread 322 is tightened to lock the posture, thus establishing a physically vertical installation benchmark for all subsequent measurements. After leveling is completed, the sensor enters the online monitoring and routine maintenance state. The liquid being measured flows into the measuring tube 111 through the guide tube 123. When the liquid level rises to the overflow weir 114... When the liquid begins to overflow continuously from the top, the liquid level is physically locked to a constant value. At this time, the static pressure difference between the two pressure taps measured by the density detector 112 fixed to the pipe wall is only proportional to the liquid density, thus achieving core density measurement. To ensure that the above ideal measurement conditions continue to hold, the continuous rotation of the movable cylinder 311 transmits the rotational torque to the connecting column 411 at the bottom through the universal coupling 312, driving the stirring plate 414 and the stirring rod 415 to rotate. The ball 421 at the end of the stirring rod 415, under the coupling of gravity, medium resistance, and the elastic force of the spring 413, generates a reciprocating up-and-down movement that accompanies the rotation, forming a vortex. The combined action of rotation and impact effectively breaks up and prevents high-concentration media from depositing and clogging in the inlet area, ensuring a continuous and stable inflow of the media. On the other hand, the rotating paddle 512 fixed on the movable cylinder 311 rotates synchronously, driving the liquid in the measuring chamber to form a forced swirling flow, generating a centrifugal force field. This causes air bubbles to be thrown against the tube wall and captured by the spiral guide groove 511 opened on the inner wall of the measuring tube 111, thereby being accelerated and guided to the top overflow area for discharge along the spiral path. This process, which combines active swirling centrifugal separation with passive spiral guided exhaust, efficiently removes gases that interfere with static pressure measurement, ensuring that the density detector 112 is always in a uniform state. In a single-phase liquid environment, after the liquid inlet stops, high-pressure gas is injected into the internal cavity of the movable cylinder 311 through the reverse connection device of the clamping structure via the spline cylinder 611, and is ejected at high speed from the air guide hole 521 on its side wall, forming an annular air sweeping flow that powerfully flushes the inner wall of the measuring tube 111 and the spiral guide groove 511. The subsequently injected cleaning liquid carries the stripped dirt to the cavity of the mounting cap 113, and finally discharges it through the guide hole 115, achieving online cleaning without disassembly. In addition, by pushing the movable cylinder 311 down through the telescopic device 614, the connecting ball 421 can be driven down to block the liquid inlet, achieving isolation between the measuring chamber and the process pipeline.

[0028] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An overflow density sensor, comprising a measuring tube (111), characterized in that, An overflow weir (114) for physically locking the internal liquid level to a constant elevation is fixedly installed at the upper end of the measuring tube (111). A density detector (112) for detecting the static pressure difference between two fixed pressure taps is installed on the side of the measuring tube (111) near the lower position. An installation cap (113) for wrapping the overflow weir (114) to form an overflow cavity is installed on the outer side of the measuring tube (111) near the upper position. Two guide holes (115) are opened at the upper end of the installation cap (113) for maintaining the internal pressure of the overflow cavity and communicating with the outside atmosphere. A clamping structure for holding and fixing the entire sensor to the external process pipeline is provided at the lower part of the measuring tube (111). A connecting structure is provided between the measuring tube (111) and the clamping structure for stepless adjustment and locking of the measuring tube (111) to a vertical position after fixing. A rotatable and axially movable cylinder (311) is coaxially provided inside the measuring tube (111). A stirring structure is provided below the movable cylinder (311) for extending into the liquid inlet area at the bottom of the measuring tube (111). A universal coupling (312) is provided between the movable cylinder (311) and the stirring structure for transmitting torque and compensating for the coaxiality deviation between the two. The lower end of the movable cylinder (311) is fixedly connected to the upper end of the universal coupling (312). A connecting tube (116) is fixedly installed at the lower end of the mounting cap (113).

2. The overflow density sensor according to claim 1, characterized in that, The clamping structure includes a guide block (211), which is fixedly installed on the bottom side of the connecting structure. The guide block (211) is an arc-shaped block. Rotating blocks (212) are movably installed at both ends of the guide block (211). Connecting sleeves (213) are fixedly installed on the bottom side of the two rotating blocks (212). Guide pull blocks (214) are provided inside the two connecting sleeves (213). A first locking thread hole (215) is opened on the side of the guide pull block (214). A first locking thread post (216) is threadedly connected inside the first locking thread hole (215).

3. An overflow density sensor according to claim 2, characterized in that, The connection structure includes a guide tube (123) fixedly installed on the upper end of the guide block (211). A rotating ball (122) is fixedly installed on the upper end of the guide tube (123). The end face of the rotating ball (122) is provided with a process rotating ball (122), a guide tube (123) and a liquid inlet of the guide block (211). A rotating cavity (121) is provided on the inner side of the measuring tube (111). The rotating ball (122) is rotatably installed inside the rotating cavity (121). A second locking thread hole (321) is provided on the side of the measuring tube (111) corresponding to the position of the rotating cavity (121). A second locking thread post (322) is threadedly connected inside the second locking thread hole (321).

4. An overflow density sensor according to claim 3, characterized in that, The stirring structure includes a connecting column (411) fixedly installed on a universal coupling (312) at one end away from the movable cylinder (311). A rectangular groove is provided at the lower end of the connecting column (411). A sliding rod (412) is slidably installed in the rectangular groove at the lower end of the connecting column (411). A spring (413) is fixedly installed at the upper end of the sliding rod (412). The upper end of the spring (413) is fixedly installed in the rectangular groove at the lower end of the connecting column (411). Several stirring plates (414) are fixedly installed on the outer side of the connecting column (411) near the lower part. A stirring rod (415) is fixedly installed at the lower end of the sliding rod (412). A detachable connecting ball (421) is provided at the lower end of the stirring rod (415).

5. An overflow density sensor according to claim 4, characterized in that, Two fixing rods (432) are fixedly installed on the inner side of the guide tube (123). A limiting cylinder (431) is fixedly installed on one side of the two fixing rods (432) corresponding to each other. The connecting column (411) is set inside the limiting cylinder (431).

6. An overflow density sensor according to claim 5, characterized in that, The inner side of the measuring tube (111) is provided with a number of spiral guide grooves (511). The spiral guide grooves (511) are spiral upward grooves. Rotary paddles (512) are fixedly installed at equal intervals on the outer side of the movable cylinder (311) corresponding to the spiral guide grooves (511).

7. An overflow density sensor according to claim 6, characterized in that, A splined cylinder (611) is fixedly installed at the upper end of the movable cylinder (311). A rotating tooth (612) is slidably connected to the outer side of the splined cylinder (611). A fixed mounting bracket (613) is provided on the upper side of the mounting cap (113). The rotating tooth (612) is rotatably installed on the upper side of the mounting bracket (613). A telescopic device (614) is fixedly installed on the upper side of the movable cylinder (311). A mounting block (615) is fixedly installed at the output end of the telescopic device (614). The mounting block (615) is rotatably installed on the splined cylinder (611). A fixed block (616) is fixedly installed on the upper side of the mounting cap (113). A rotating tooth (612) is fixedly installed on the side of the fixed block (616). A matching gear (618) that meshes with the rotating tooth (612) is fixedly installed at the output end of the rotating tooth (612).

8. An overflow density sensor according to claim 7, characterized in that, The movable cylinder (311) has several sets of exhaust holes arranged sequentially from bottom to top on its side. Each set of exhaust holes consists of several air guide holes (521) that are equidistantly opened on the outside of the movable cylinder (311).

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