A fixed online density meter

Abstract

The present invention relates to the field of density measurement technology, and in particular to a fixed online density meter, comprising a flange, a circular mounting groove is provided on the top of the flange, a rotating ring is rotatably installed in the mounting groove, a cylindrical fixed pile is rotatably installed at the inner ring of the rotating ring, two symmetrically arranged tuning fork detection heads are arranged at the bottom of the rotating ring, two symmetrically arranged connecting piles are arranged at the top of the rotating ring, and a display instrument is arranged at the top of the two connecting piles and above the fixed piles. The invention designs a rotating ring, and two tuning fork detection heads can be used reciprocatingly and cyclically through the rotation of the rotating ring, thereby improving the efficiency of density detection.

Description

Technical Field

[0001] The invention relates to the technical field of density measurement, and in particular to a fixed online density meter. Background Art

[0002] Online densitometer is an instrument used to continuously measure the density of liquid online and can be directly used in industrial production processes.

[0003] There are many types of online density meters, among which tuning fork density meters are more common. Conventional tuning fork density meters are generally fixedly connected to the pipeline through a flange, and the tuning fork part thereof extends into the pipeline. When liquid passes through the pipeline, the concentration and density of the liquid can be detected. Since it is fixed to the pipeline through a flange, it belongs to a fixed structure, and the tuning fork part of the tuning fork density meter usually needs to be cleaned after being used for a period of time. At present, when cleaning the tuning fork density meter, it is mainly done by disassembling the flange and then removing the tuning fork density meter for cleaning. This method takes a long time for disassembly, cleaning and subsequent installation, and has a low cleaning efficiency, which reduces the detection efficiency. At the same time, the sealing of the flange is easily reduced after multiple disassemblies, and there is a risk of leakage during subsequent liquid transportation. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose a fixed online density meter.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fixed online density meter, including a flange, a circular mounting groove is opened on the top of the flange, the mounting groove passes through the flange, a rotating ring is rotatably installed in the mounting groove, a cylindrical fixed pile is rotatably installed at the inner ring of the rotating ring, two symmetrically arranged tuning fork detection heads are arranged at the bottom of the rotating ring, two symmetrically arranged connecting piles are arranged on the top of the rotating ring, the installation positions of the two connecting piles correspond to the installation positions of the two tuning fork detection heads respectively, the tops of the two connecting piles are higher than the tops of the fixed piles, a display instrument is arranged on the tops of the two connecting piles and above the fixed piles, and the tops of the two connecting piles are fixedly connected to the bottom of the display instrument.

[0006] In the above-mentioned fixed online density meter, the rotating ring is composed of an upper mounting ring and a lower mounting ring, the bottom of the lower mounting ring is flush with the bottom of the flange, a rotating groove with a circular ring structure is provided on the inner wall of the mounting groove, the outer wall of the lower mounting ring is rotatably connected to the rotating groove, a sealing ring with a circular ring structure is fixedly installed on the inner wall of the mounting groove and above the rotating groove, a connecting ring is fixedly installed on the top of the lower mounting ring, the upper mounting ring is arranged above the lower mounting ring and the sealing ring, and a connecting groove with a circular ring structure is provided at the bottom of the upper mounting ring The connecting ring is inserted in the connecting groove, and a plurality of spring rods 1 are fixedly installed in the connecting ring. The telescopic end of the spring rod 1 passes through the connecting ring and is fixedly installed on the inner wall of the connecting groove. The bottom of the connecting pile passes through the upper mounting ring and the lower mounting ring and is fixedly connected to the corresponding tuning fork detection head. The connecting pile is slidably connected to the upper mounting ring, and the connecting pile is fixedly connected to the lower mounting ring. A rotating groove 2 with a circular ring structure is opened on the outer wall of the fixed pile. The inner ring wall of the lower mounting ring is rotatably connected to the rotating groove 2. A sealing ring 2 is fixedly installed on the outer wall of the fixed pile and above the rotating groove 2.

[0007] In the above-mentioned fixed online density meter, the top edge of the upper mounting ring is provided with a plurality of fixing grooves 1 evenly distributed along its circumference, the top of the flange and the edge of the mounting groove are provided with a plurality of fixing grooves 2 evenly distributed along its circumference, the plurality of fixing grooves 1 correspond to and are connected with the plurality of fixing grooves 2 one by one, and a fixing block with a disc-shaped structure is inserted in the corresponding fixing grooves 1 and 2, and the fixing block is fixedly connected in the corresponding fixing grooves 1 and 2 by bolts.

[0008] In the above-mentioned fixed online density meter, two symmetrically arranged positioning grooves are opened on the top of the outer wall of the lower mounting ring, a spring rod 2 is inserted into the top of the sealing ring 1, the installation position of the spring rod 2 corresponds to the opening position of the positioning groove, and the bottom of the spring rod 2 passes through the sealing ring 1 and cooperates with the positioning groove.

[0009] In the above-mentioned fixed online density meter, a hollow groove is opened in the connecting pile, a telescopic rod is vertically fixedly installed on the inner wall of the hollow groove, a movable block is fixedly installed on the telescopic end of the telescopic rod, a connecting guide is fixedly installed on the bottom of the inner wall of the hollow groove, the connecting guide is connected to the corresponding tuning fork detection head through a wire, a movable guide is fixedly installed on the bottom of the movable block, and the movable guide is connected to the display instrument through a wire.

[0010] In the above-mentioned fixed online density meter, the bottom of the fixed pile is flush with the bottom of the flange, an electric slide is provided at the bottom of the fixed pile, and a cleaning module is provided at the bottom of the fixed pile. The cleaning module is in a cylindrical structure, and the top of the cleaning module is slidably connected to the electric slide. A cleaning groove is provided on one side of the cleaning module. Two symmetrically arranged driving shafts are rotatably installed at the bottom of the cleaning module, and a plurality of fan blades are fixedly installed on the outer wall of the driving shaft. A guide cover is fixedly installed at the bottom of the cleaning module and located on the outside of the driving shaft and the fan blades. The top of the driving shaft extends into the cleaning groove and a main cleaning shaft is fixedly installed thereon. Two symmetrically arranged auxiliary cleaning shafts are rotatably installed at the bottom of the inner wall of the cleaning groove, and the installation positions of the two auxiliary cleaning shafts correspond one by one to the installation positions of the two main cleaning shafts respectively. The bottom of the auxiliary cleaning shaft extends into the cleaning module and an auxiliary wheel is fixedly installed thereon. The part of the main cleaning shaft extending into the cleaning module is fixedly installed with a driving wheel, and the driving wheel is connected to the corresponding auxiliary wheel through a belt.

[0011] In the above-mentioned fixed online densitometer, two symmetrically arranged receiving grooves are provided on the outer wall of the cleaning module, and a blocking plate with an arc-shaped structure is rotatably installed in the receiving groove.

[0012] In the above-mentioned fixed online density meter, a plurality of water flow holes are provided on the inner wall of the storage tank, and the water flow holes are connected to the cleaning tank.

[0013] Compared with the existing technology, the advantages of this fixed online density meter are: the present invention is designed with a rotating ring, through the rotation of the rotating ring, the two tuning fork detection heads can be used reciprocatingly and cyclically, thereby improving the efficiency of density detection. At the same time, there is no need to remove the flange, which further improves the efficiency of density detection. In the process of rotating the two tuning fork detection heads, the cleaning module can be used to clean the unactivated tuning fork detection head, thereby preventing the tuning fork part of the tuning fork detection head from being stained after long-term use, thereby affecting the accuracy of density detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the flange and the display instrument in the present invention.

[0015] Figure 2 It is a three-dimensional structural schematic diagram of the tuning fork detection head and the cleaning module in the present invention.

[0016] Figure 3 It is a schematic diagram of the three-dimensional structure of the rotating ring, the fixed pile and the connecting pile in the present invention.

[0017] Figure 4 The present invention Figure 3 Schematic diagram of the local enlarged structure at point A in the middle.

[0018] Figure 5 The present invention Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0019] Figure 6 The present invention Figure 3 Schematic diagram of the local enlarged structure at point C in the middle.

[0020] Figure 7 It is a schematic cross-sectional structural diagram of the upper mounting ring and the lower mounting ring in the present invention.

[0021] Figure 8 It is a schematic diagram of the three-dimensional structure of the cleaning module in the present invention.

[0022] Fig. 9 It is a schematic diagram of the three-dimensional structure of the fixed pile in the present invention.

[0023] Fig.10 It is a schematic diagram of the cross-sectional structure of the cleaning tank and the storage tank in the present invention.

[0024] Fig.11 It is a partial cross-sectional structural schematic diagram of the cleaning module in the present invention.

[0025] In the figure: 1, flange; 101, mounting groove; 2, rotating ring; 3, fixing pile; 4, tuning fork detection head; 5, connecting pile; 6, display instrument; 201, upper mounting ring; 202, lower mounting ring; 102, rotating groove 1; 103, sealing ring 1; 203, connecting ring; 204, connecting groove; 205, spring rod 1; 301, rotating groove 2; 302, sealing ring 2; 206, fixing groove 1; 104, fixing groove 2; 105, fixing block; 20 7. Positioning groove; 106. Spring rod 2; 501. Hollow groove; 502. Telescopic rod; 503. Movable block; 504. Connecting guide; 505. Movable guide; 303. Electric slide; 7. Cleaning module; 701. Cleaning groove; 702. Drive shaft; 703. Guide cover; 704. Main cleaning shaft; 705. Auxiliary cleaning shaft; 706. Auxiliary wheel; 707. Drive wheel; 708. Storage groove; 709. Blocking plate; 710. Water flow hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the 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 cannot be understood as a limitation on the present invention.

[0028] Reference Figure 1-Figure 11 A fixed online density meter comprises a flange 1, a circular mounting groove 101 is provided on the top of the flange 1, the mounting groove 101 passes through the flange 1, a rotating ring 2 is rotatably mounted in the mounting groove 101, a cylindrical fixed pile 3 is rotatably mounted on the inner ring of the rotating ring 2, two symmetrically arranged tuning fork detection heads 4 are arranged on the bottom of the rotating ring 2, two symmetrically arranged connecting piles 5 are arranged on the top of the rotating ring 2, the installation positions of the two connecting piles 5 correspond to the installation positions of the two tuning fork detection heads 4 one by one, the tops of the two connecting piles 5 are higher than the tops of the fixing piles 3, a display instrument 6 is arranged on the tops of the two connecting piles 5 and above the fixing piles 3, the tops of the two connecting piles 5 are fixedly connected to the bottom of the display instrument 6, the flange 1 is fixedly connected to the pipeline by bolts, the mounting groove 101 is used to install the rotating ring 2 and the fixing pile 3, the tuning fork detection head 4 is used to detect the density of the liquid in the pipeline, the connecting pile 5 is used to fix the display instrument 6, and at the same time, the tuning fork detection head 4 can be connected to the display instrument 6.

[0029] The rotating ring 2 consists of an upper mounting ring 201 and a lower mounting ring 202. The bottom of the lower mounting ring 202 is flush with the bottom of the flange 1. A rotating groove 102 with a circular ring structure is provided on the inner wall of the mounting groove 101. The outer wall of the lower mounting ring 202 is rotatably connected to the rotating groove 102. The lower mounting ring 202 is rotatably connected to the flange 1 through the rotating groove 102.

[0030] A sealing ring 103 with an annular structure is fixedly installed on the inner wall of the mounting groove 101 and located above the rotating groove 102. A connecting ring 203 is fixedly installed on the top of the lower mounting ring 202. The upper mounting ring 201 is arranged above the lower mounting ring 202 and the sealing ring 103. A connecting groove 204 with an annular structure is opened at the bottom of the upper mounting ring 201. The connecting ring 203 is inserted into the connecting groove 204. The connecting ring 203 and the connecting groove 204 can be connected to each other. The upper mounting ring 201 and the lower mounting ring 202 are plugged into each other, and the upper mounting ring 201 can rotate under the drive of the lower mounting ring 202. The sealing ring 103 is located between the upper mounting ring 201 and the lower mounting ring 202. When the upper mounting ring 201 and the lower mounting ring 202 are plugged and fixed, the sealing ring 103 will respectively conflict with the upper mounting ring 201 and the lower mounting ring 202, and cooperate with the sealing rubber rings installed on the top and bottom of the sealing ring 103 to achieve a sealing effect.

[0031] A plurality of spring rods 205 are fixedly installed in the connecting ring 203, and the telescopic ends of the spring rods 205 penetrate the connecting ring 203 and are fixedly installed on the inner wall of the connecting groove 204. The bottom of the connecting pile 5 penetrates the upper mounting ring 201 and the lower mounting ring 202 and is fixedly connected to the corresponding tuning fork detection head 4. The connecting pile 5 is slidably connected to the upper mounting ring 201, and the connecting pile 5 is fixedly connected to the lower mounting ring 202. The spring rods 205 can separate the upper mounting ring 201 and the lower mounting ring 202 through elastic force. A sealing rubber ring is fixedly installed on the outer wall of the connecting pile 5. When the upper mounting ring 201 is pressed down to the specified position, it will conflict with the sealing rubber ring on the outer wall of the connecting pile 5 and the sealing rubber ring on the top of the sealing ring 103, so as to achieve sealing of the connection gap of the upper mounting ring 201.

[0032] A rotating groove 2 301 of an annular structure is provided on the outer wall of the fixed pile 3, and the inner ring wall of the lower mounting ring 202 is rotatably connected to the rotating groove 2 301. A sealing ring 2 302 is fixedly installed on the outer wall of the fixed pile 3 and above the rotating groove 2 301. The rotating groove 2 301 is used to connect the fixed pile 3 with the lower mounting ring 202. Sealing rubber rings are fixedly installed on the top and bottom of the sealing ring 2 302. When the upper mounting ring 201 is pressed down to the specified position, it will conflict with the sealing ring 2 302. At this time, the gap between the upper mounting ring 201 and the sealing ring 2 302 can be sealed by the sealing rubber ring.

[0033] The top edge of the upper mounting ring 201 is provided with a plurality of fixing grooves 1 206 evenly distributed along its circumference, and the top of the flange 1 and the edge of the mounting groove 101 are provided with a plurality of fixing grooves 2 104 evenly distributed along its circumference, and the plurality of fixing grooves 1 206 correspond to and are connected with the plurality of fixing grooves 2 104 one by one, and a fixing block 105 of a disc-shaped structure is inserted in the corresponding fixing groove 1 206 and the fixing groove 2 104, and the fixing block 105 is fixedly connected to the corresponding fixing groove 1 206 and the fixing groove by bolts. In the second 104, during installation, the upper mounting ring 201 can be pressed downward and locked by a plurality of fixing blocks 105, and the lower mounting ring 202 is connected to the upper mounting ring 201 by a spring rod 205. When the upper mounting ring 201 is locked, the lower mounting ring 202 will be locked synchronously. When the rotating ring 2 needs to be rotated, the plurality of fixing blocks 105 need to be taken out to release the upper mounting ring 201. At this time, the rotating ring 2, the connecting pile 5 and the display instrument 6 can be operated to rotate synchronously.

[0034] Two symmetrically arranged positioning grooves 207 are provided on the top of the outer wall of the lower mounting ring 202, and a spring rod 206 is inserted on the top of the sealing ring 103. The installation position of the spring rod 206 corresponds to the opening position of the positioning groove 207. The bottom of the spring rod 206 penetrates the sealing ring 103 and cooperates with the positioning groove 207. After the lower mounting ring 202 is rotated to the specified position under the drive of the upper mounting ring 201, the spring rod 206 will be aligned with one of the two positioning grooves 207. At this time, by pressing the upper mounting ring 201 downward, the upper mounting ring 201 will be pressed downward to squeeze the spring rod 206 synchronously, so that the bottom of the spring rod 106 is inserted into the aligned positioning groove 207. When the rotation position of the lower mounting ring 202 is incorrect, the upper mounting ring 201 cannot be pressed downward, which can avoid the deviation of the rotation angle of the lower mounting ring 202.

[0035] A hollow groove 501 is provided in the connecting pile 5, a telescopic rod 502 is vertically fixedly installed on the inner wall of the hollow groove 501, a movable block 503 is fixedly installed on the telescopic end of the telescopic rod 502, a connecting guide 504 is fixedly installed on the bottom of the inner wall of the hollow groove 501, the connecting guide 504 is connected to the corresponding tuning fork detection head 4 through a wire, a movable guide 505 is fixedly installed on the bottom of the movable block 503, and the movable guide 505 is connected to the display instrument 6 through a wire, and the telescopic rod 502 is electrically driven. The two tuning fork detection heads 4 are aligned front to back. When one of the two tuning fork detection heads 4 rotates to the front under the drive of the lower mounting ring 202, the telescopic end of the corresponding telescopic rod 502 is extended to push the movable block 503 and the movable guide piece 505 to approach and connect with the connecting guide piece 504. At the same time, the telescopic rod 502 in the other connecting pile 5 is contracted to separate the corresponding movable guide piece 505 from the connecting guide piece 504, so as to avoid the two tuning fork detection heads 4 being activated at the same time to increase power consumption.

[0036] The bottom of the fixed pile 3 is flush with the bottom of the flange 1, an electric slide 303 is provided at the bottom of the fixed pile 3, a cleaning module 7 is provided at the bottom of the fixed pile 3, the cleaning module 7 is in a cylindrical structure, the top of the cleaning module 7 is slidably connected to the electric slide 303, a cleaning groove 701 is provided on one side of the cleaning module 7, two symmetrically arranged drive shafts 702 are rotatably installed at the bottom of the cleaning module 7, a plurality of fan blades are fixedly installed on the outer wall of the drive shaft 702, and the bottom of the cleaning module 7 is fixedly located on the outer side of the drive shaft 702 and the fan blades. A guide cover 703 is installed, the top of the driving shaft 702 extends into the cleaning tank 701 and is fixedly installed with a main cleaning shaft 704, two symmetrically arranged auxiliary cleaning shafts 705 are rotatably installed at the bottom of the inner wall of the cleaning tank 701, and the installation positions of the two auxiliary cleaning shafts 705 correspond to the installation positions of the two main cleaning shafts 704 one by one, the bottom of the auxiliary cleaning shaft 705 extends into the cleaning module 7 and is fixedly installed with an auxiliary wheel 706, and the part of the main cleaning shaft 704 extending into the cleaning module 7 is fixedly installed with a driving wheel 707, The driving wheel 707 is connected to the corresponding auxiliary wheel 706 through a belt, and the electric slide 303 can drive the cleaning module 7 to move back and forth. When the two tuning fork detection heads 4 rotate to the specified position, the cleaning module 7 is operated to approach the unactivated tuning fork detection head 4, and the unactivated tuning fork detection head 4 can be wrapped by the cleaning groove 701 on the cleaning module 7. When the unactivated tuning fork detection head 4 is inserted into the cleaning groove 701, the outer wall of the unactivated tuning fork detection head 4 can be cleaned by the main cleaning shaft 704 and the auxiliary cleaning shaft 705. In order to prevent the unactivated tuning fork detection head 4 from being immersed in liquid for a long time to generate stains, thereby affecting the accuracy of density detection, brushes are fixedly installed on the outer walls of the main cleaning shaft 704 and the auxiliary cleaning shaft 705. At the same time, when performing liquid density detection, the driving shaft 702 can be driven to rotate under the action of the liquid flow rate. The driving shaft 702 can drive the main cleaning shaft 704 and the auxiliary cleaning shaft 705 to rotate synchronously under the action of the driving wheel 707 and the auxiliary wheel 706, which can further improve the cleaning effect of the tuning fork detection head 4.

[0037] Two symmetrically arranged storage grooves 708 are provided on the outer wall of the cleaning module 7, and a blocking plate 709 with an arc-shaped structure is rotatably installed in the storage groove 708. The blocking plate 709 is electrically driven. The unfolded blocking plate 709 can reduce the flow rate of the liquid within a certain range, which is convenient for the detection of the tuning fork detection head 4. At the same time, the cleaning module 7 can be driven to move under the push of the water flow.

[0038] A plurality of water flow holes 710 are provided on the inner wall of the storage groove 708, and the water flow holes 710 are connected with the cleaning groove 701. The water flow holes 710 are used to allow liquid to pass through quickly after the blocking plate 709 is unfolded. The quickly passing liquid will hit the connecting column above the tuning fork detection head 4, which can further clean the tuning fork detection head 4. The front side of the connecting column above the tuning fork detection head 4 can directly face the flowing liquid when activated, which can achieve a certain cleaning effect, while the back side cannot be washed by the water flow, and stains are easily accumulated after long-term use.

[0039] The specific working principle and use method of the present invention are explained in detail below: When in use, the flange 1 is fixed to a predetermined position on the pipeline by bolts, and the rotating ring 2 is fixed by a plurality of fixing blocks 105. At this time, the two tuning fork detection heads 4 are distributed in a straight line, and the tuning fork detection head 4 facing the flow direction of the pipeline liquid is started, so that the density of the liquid in the pipeline can be detected;

[0040] When the tuning fork detection head 4 needs to be cleaned after long-term use, the liquid in the pipeline is stopped and the plurality of fixing blocks 105 are removed. At this time, the upper mounting ring 201 and the lower mounting ring 202 are separated under the action of the spring rod 1 205. At this time, the rotating ring 2 is rotated to swap the positions of the two tuning fork detection heads 4. While rotating the rotating ring 2, the fixing pile 3 is operated to keep it fixed. After the rotating ring 2 is rotated, the plurality of fixing blocks 105 are fixed in the fixing groove 1 206 and the fixing groove 2 104 by bolts again, and the upper mounting ring 201 is pressed down;

[0041] After the operation is reversed, the tuning fork detection head 4 that is opposite to the flow direction of the pipeline liquid is started, and the cleaning module 7 is operated to approach the unactivated tuning fork detection head 4. The unactivated tuning fork detection head 4 can be wrapped by the cleaning groove 701 on the cleaning module 7. When the unactivated tuning fork detection head 4 is inserted into the cleaning groove 701, the outer wall of the unactivated tuning fork detection head 4 can be cleaned by the main cleaning shaft 704 and the auxiliary cleaning shaft 705 to avoid the unactivated tuning fork detection head 4 being immersed in the liquid for a long time to produce stains, thereby affecting the accuracy of density detection. Brushes are fixedly installed on the outer walls of the main cleaning shaft 704 and the auxiliary cleaning shaft 705. At the same time, when performing liquid density detection, the driving shaft 702 can be pushed to rotate under the action of the liquid flow rate. The driving shaft 702 can drive the main cleaning shaft 704 and the auxiliary cleaning shaft 705 to rotate synchronously under the action of the driving wheel 707 and the auxiliary wheel 706, which can further improve the cleaning effect of the tuning fork detection head 4.

[0042] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fixed online density meter, comprising a flange (1), characterized in that: The top of the flange (1) is provided with a mounting groove (101) of a circular structure, the mounting groove (101) passes through the flange (1), a rotating ring (2) is rotatably mounted in the mounting groove (101), a cylindrical fixed pile (3) is rotatably mounted at the inner ring of the rotating ring (2), two symmetrically arranged tuning fork detection heads (4) are arranged at the bottom of the rotating ring (2), two symmetrically arranged connecting piles (5) are arranged at the top of the rotating ring (2), the mounting positions of the two connecting piles (5) respectively correspond to the mounting positions of the two tuning fork detection heads (4), the tops of the two connecting piles (5) are higher than the tops of the fixed piles (3), a display instrument (6) is arranged at the tops of the two connecting piles (5) and above the fixed piles (3), and the tops of the two connecting piles (5) are fixedly connected to the bottom of the display instrument (6); The rotating ring (2) is composed of an upper mounting ring (201) and a lower mounting ring (202); the bottom of the lower mounting ring (202) is flush with the bottom of the flange (1); a rotating groove (102) with a circular ring structure is provided on the inner wall of the mounting groove (101); the outer wall of the lower mounting ring (202) is rotatably connected to the rotating groove (102); a sealing ring (103) with a circular ring structure is fixedly installed on the inner wall of the mounting groove (101) and above the rotating groove (102); a connecting ring (203) is fixedly installed on the top of the lower mounting ring (202); the upper mounting ring (201) is arranged above the lower mounting ring (202) and the sealing ring (103); a connecting groove (204) with a circular ring structure is provided at the bottom of the upper mounting ring (201); and the connecting ring (203) is inserted into the rotating groove (102). A plurality of spring rods (205) are fixedly installed in the connecting groove (204) and the connecting ring (203); the telescopic end of the spring rod (205) passes through the connecting ring (203) and is fixedly installed on the inner wall of the connecting groove (204); the bottom of the connecting pile (5) passes through the upper mounting ring (201) and the lower mounting ring (202) and is fixedly connected to the corresponding tuning fork detection head (4); the connecting pile (5) is slidably connected to the upper mounting ring (201); the connecting pile (5) is fixedly connected to the lower mounting ring (202); a rotating groove (301) of a circular ring structure is provided on the outer wall of the fixed pile (3); the inner ring wall of the lower mounting ring (202) is rotatably connected to the rotating groove (301); and a sealing ring (302) is fixedly installed on the outer wall of the fixed pile (3) and located above the rotating groove (301); The connecting pile (5) is provided with a hollow groove (501), a telescopic rod (502) is vertically fixedly mounted on the inner wall of the hollow groove (501), a movable block (503) is fixedly mounted on the telescopic end of the telescopic rod (502), a connecting guide piece (504) is fixedly mounted on the bottom of the inner wall of the hollow groove (501), the connecting guide piece (504) is connected to the corresponding tuning fork detection head (4) through a wire, a movable guide piece (505) is fixedly mounted on the bottom of the movable block (503), and the movable guide piece (505) is connected to the display instrument (6) through a wire, and the two The tuning fork detection heads (4) are aligned and distributed front to back. When one of the two tuning fork detection heads (4) is driven by the lower mounting ring (202) to rotate to the front, the telescopic end of the corresponding telescopic rod (502) is extended to push the movable block (503) and the movable guide piece (505) to approach and connect with the connecting guide piece (504). At the same time, the telescopic rod (502) in the other connecting pile (5) is contracted to separate the corresponding movable guide piece (505) from the connecting guide piece (504), thereby preventing the two tuning fork detection heads (4) from being activated at the same time and increasing power consumption. The bottom of the fixed pile (3) is flush with the bottom of the flange (1); an electric slide groove (303) is provided at the bottom of the fixed pile (3); a cleaning module (7) is provided at the bottom of the fixed pile (3); the cleaning module (7) is in a cylindrical structure; the top of the cleaning module (7) is slidably connected to the electric slide groove (303); a cleaning groove (701) is provided on one side of the cleaning module (7); two symmetrically arranged drive shafts (702) are rotatably mounted at the bottom of the cleaning module (7); a plurality of fan blades are fixedly mounted on the outer wall of the drive shaft (702); and a guide cover (703) is fixedly mounted at the bottom of the cleaning module (7) and located outside the drive shaft (702) and the fan blades. The top of the driving shaft (702) extends into the cleaning groove (701) and is fixedly mounted with a main cleaning shaft (704); two symmetrically arranged auxiliary cleaning shafts (705) are rotatably mounted on the bottom of the inner wall of the cleaning groove (701); the mounting positions of the two auxiliary cleaning shafts (705) correspond one to one with the mounting positions of the two main cleaning shafts (704); the bottom of the auxiliary cleaning shaft (705) extends into the cleaning module (7) and is fixedly mounted with an auxiliary wheel (706); the portion of the main cleaning shaft (704) extending into the cleaning module (7) is fixedly mounted with a driving wheel (707); the driving wheel (707) is connected to the corresponding auxiliary wheel (706) via a belt.

2. A fixed online density meter according to claim 1, characterized in that: The top edge of the upper mounting ring (201) is provided with a plurality of fixing grooves 1 (206) evenly distributed along its circumference, and the top of the flange (1) and the edge of the mounting groove (101) are provided with a plurality of fixing grooves 2 (104) evenly distributed along its circumference. The plurality of fixing grooves 1 (206) correspond to and are connected to the plurality of fixing grooves 2 (104) one by one, and a fixing block (105) with a disc-shaped structure is inserted into the corresponding fixing grooves 1 (206) and the fixing grooves 2 (104), and the fixing block (105) is fixedly connected to the corresponding fixing grooves 1 (206) and the fixing grooves 2 (104) by bolts.

3. A fixed online density meter according to claim 1, characterized in that: The top of the outer wall of the lower mounting ring (202) is provided with two symmetrically arranged positioning grooves (207); a spring rod 2 (106) is inserted into the top of the sealing ring 1 (103); the mounting position of the spring rod 2 (106) corresponds to the opening position of the positioning groove (207); the bottom of the spring rod 2 (106) passes through the sealing ring 1 (103) and is concavely matched with the positioning groove (207).

4. A fixed online density meter according to claim 1, characterized in that: Two symmetrically arranged receiving grooves (708) are provided on the outer wall of the cleaning module (7), and a blocking plate (709) with an arc-shaped structure is rotatably installed in the receiving groove (708).

5. A fixed online density meter according to claim 4, characterized in that: A plurality of water circulation holes (710) are provided on the inner wall of the storage tank (708), and the water circulation holes (710) are connected to the cleaning tank (701).

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