Cam type scraper flowmeter

Abstract

The utility model relates to a cam type scraper flow meter which comprises an outer shell, an inner shell, a lining, a rotating cylinder assembly, a measuring meter head and an outer sealing cover, and the rotating cylinder assembly comprises an inner cylinder, an inner sealing cover, a rotating shaft, a cam and a scraper assembly; the scraper assembly comprises two metal scrapers, a connecting sleeve and a first bearing; a scraper support is arranged at the bottom of the inner cylinder, a supporting roller is arranged between the metal scraper and the scraper support, a first alloy sleeve is arranged between the metal scraper and the supporting roller, a second alloy sleeve is arranged at the end, away from the cam, of the metal scraper, a supporting plate is arranged on the shell, and a limiting groove is formed in the supporting plate. A first limiting block is arranged below the scraper support, the limiting groove is matched with the first limiting block, a first guide groove is formed in the inner side of the outer shell, a first guide block is arranged in the first guide groove, and positioning bolts are arranged on the inner shell and the outer shell. And the maintenance difficulty caused by pressing damage due to embedding of particulate matters can be reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of flow metering equipment, in particular to a cam type scraper flow meter. Background Art

[0002] Cam type scraper flowmeter has two forms: cam type and concave line type. Regardless of the form of cam type scraper flowmeter, it is generally composed of flowmeter body, connection part and meter head. The main part of cam type scraper flowmeter is mainly composed of rotor cylinder, cam, camshaft, scraper connecting rod, roller and shell. The inner cavity of the shell is a circular hollow cylinder. The rotor cylinder is a rotating hollow thin-walled cylinder. When there are two pairs of scrapers, four grooves with 90 degrees to each other are opened radially on the rotor cylinder. When there are three pairs of scrapers, six grooves with 60 degrees are opened. The scraper slides in the groove and can extend or retract. The four scrapers are connected by two connecting rods at 90 degrees to each other. There is a bearing between the three pairs of scrapers and the cam. The four or six bearings roll on a stationary cam with a certain shape, so that the scraper sometimes extends from the rotor cylinder and sometimes retracts into the rotor cylinder. When the measured liquid passes through the flowmeter, it drives the scraper and the rotor cylinder to rotate. At the same time, the scraper extends or retracts radially along a special trajectory. However, the distance between the end faces of each two opposite scrapers is a certain value, so when the scraper rotates continuously, a fixed volume metering space is formed between two adjacent scrapers, the rotor cylinder, the shell, the inner cavity, and the upper and lower cover plates. Each time the rotor cylinder rotates one circle, it can discharge 4 or 6 equally closed volumes, that is, the amount of liquid in the precise metering space.

[0003] In petrochemical enterprises, they will measure crude oil, residual oil, and high-water crude oil for transit and trade settlement. Cam-type scraper flowmeters have been widely used, but in the process of application, they often need to be used in conjunction with other instruments. They can effectively improve the measurement accuracy at work, but it is undeniable that some problems will still be exposed in actual applications. Especially in terms of the measured medium, since the raw materials will inevitably carry some particles, the particles will be stuck between the scraper and the inner wall of the shell when the two adjacent scrapers form a fixed measurement space for the solvent during the rotation process. Although this phenomenon occurs with a small probability, once it occurs, it is easy to scratch the inner wall of the shell or the scraper, resulting in leakage of the measured liquid. Therefore, the cam scraper flowmeter needs to be repaired and cleaned regularly to reduce the phenomenon of particles scratching the inner wall of the shell or the scraper. If the shell is damaged, it is necessary to consider whether to replace the shell or the scraper according to the actual test. To replace the scraper, the rotor cylinder needs to be disassembled to replace the scraper to meet the metering requirements again. Therefore, since the medium delivered to the cam scraper flowmeter will inevitably carry particles, the daily inspection or maintenance difficulty of the cam scraper flowmeter is reduced, thereby reducing the maintenance cycle and improving market promotion. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a cam-type scraper flowmeter capable of reducing the difficulty of maintenance caused by scratches caused by embedded particles, so as to overcome the defects in the prior art.

[0005] The technical solution adopted by the utility model is as follows: a cam-type scraper flowmeter comprises an outer shell, an inner shell, an inner liner, a rotating drum assembly and a measuring meter head, an outer sealing cover is arranged on the open end of the outer shell, the rotating drum assembly comprises an inner cylinder arranged on the inner side of the inner shell, an inner sealing cover arranged on the top of the inner shell, a rotating shaft arranged on the inner sealing cover and the inner cylinder, a cam arranged on the rotating shaft and a scraper assembly arranged on the inner cylinder; the scraper assembly comprises two metal scrapers, a connecting sleeve arranged between the two metal scrapers and a first bearing is arranged at one end of each metal scraper close to the cam; a scraper bracket is arranged at the bottom of the inner cylinder, and the bottom end of each metal scraper and the Support rollers are respectively arranged between the scraper brackets, a first alloy sleeve is respectively arranged between each metal scraper and the support roller, a second alloy sleeve is respectively arranged on the end of each metal scraper away from the cam, a support plate is arranged on the outer shell below the scraper bracket, a limiting groove is arranged on the support plate, a first limiting block is arranged below the scraper bracket, the limiting groove and the first limiting block cooperate with each other, a first guide groove is arranged on the inner side of the outer shell, a first guide block is arranged in the first guide groove, the first guide groove extends along the top end of the inner cavity of the outer shell toward the bottom end of the inner cavity of the outer shell, and positioning bolts are arranged on the inner shell and the outer shell.

[0006] Preferably, the inner cover and the outer cover are respectively provided with hanging rings.

[0007] Preferably, a turbidity sensor is arranged in the inner cavity of the shell below the scraper bracket, a sewage pipe is arranged on the bottom end of the shell, and a sewage valve is arranged on the sewage pipe.

[0008] Preferably, the scraper bracket includes a first connecting ring, a second bearing arranged between the first connecting ring and the rotating shaft, a first fixing ring arranged on both sides of the second bearing and the first connecting ring, a first fixing bolt arranged on each first fixing ring and the first connecting ring, a second connecting ring arranged below the first connecting ring, a first connecting rod arranged between the second connecting ring and the first connecting ring, and a support rod arranged outside the second connecting ring. The number of support rollers is several, the number of support rods corresponds to the number of support rollers, and a support roller is installed on each support rod.

[0009] Preferably, the end of the metal scraper away from the cam and the bottom end of the metal scraper both adopt a convex structure, the inner cavity of the second alloy sleeve and the shape of the end of the metal scraper away from the cam match each other, the inner cavity of the first alloy sleeve and the shape of the bottom end of the metal scraper match each other, and the second alloy sleeve and the metal scraper as well as the first alloy sleeve of the metal scraper are respectively provided with a second fixing bolt.

[0010] Preferably, a lower cover is provided at the bottom of the inner shell, and the lower cover is located between the scraper bracket and the supporting plate. The first limit block is installed at the bottom end of the lower cover, and the rotating shaft is installed through the lower cover and the inner cover. The number of first limit blocks is several, and the several first limit blocks are evenly distributed in a star shape on the outside of the rotating shaft, and the number of limit grooves corresponds to the number of first limit blocks.

[0011] Preferably, a third connecting ring is provided on the rotating shaft below the lower cover, a second connecting rod is provided between the third connecting ring and the inner cylinder, a third bearing is provided between the third connecting ring and the rotating shaft, a second fixing ring is provided on the third bearing and the third connecting ring, a third fixing bolt is provided on the second fixing ring and the third connecting ring, an adjustment sleeve is provided on the rotating shaft below the third bearing, the adjustment sleeve and the third bearing abut against each other, an adjustment groove is provided on the rotating shaft inside the adjustment sleeve, the adjustment groove extends from the top end of the rotating shaft to the bottom end of the rotating shaft, an adjusting slider is provided in the adjusting groove, an adjusting rod is provided on the adjusting slider, the adjusting rod and the adjusting sleeve abut against each other, an adjusting screw is provided in the rotating shaft above the adjusting slider, an adjusting nut is provided on the adjusting screw above the rotating shaft, and the adjusting nut and the adjusting screw are threadedly connected.

[0012] Preferably, a second limit block is arranged between the lower cover and the rotating shaft, a second guide groove is arranged on the top of the inner cover, a second guide block is arranged on the rotating shaft, the bottom of the second guide block is installed in the second guide groove, a pressure ring is arranged on the top of the second guide block, the circumscribed circle diameter of the bottom of the second guide block gradually decreases as the height of the second guide block decreases, and the circumscribed circle diameter of the top of the second guide block gradually increases as the height of the second guide block decreases, the shape of the inner cavity of the second guide groove matches the shape of the bottom of the second guide block, and the shape of the top of the second guide block matches the shape of the bottom of the pressure ring.

[0013] The beneficial effects of the utility model are as follows: firstly, a second alloy sleeve is installed on the end of the metal scraper of the utility model away from the cam, the material of the second alloy sleeve is 304 austenitic stainless steel, and the material of the inner shell is 630 martensitic stainless steel. Even if particles are embedded and cause scratches, since the Mohs hardness of 630 martensitic stainless steel is greater than that of 304 austenitic stainless steel, the second alloy sleeve will be scratched first. After disassembling the product, replacing the second alloy sleeve can achieve the technical purpose of rapid maintenance, thereby reducing the difficulty of maintenance caused by scratches caused by embedded particles.

[0014] Secondly, a turbidity sensor is arranged in the inner cavity of the shell below the scraper bracket described in the utility model, so as to facilitate the feedback of turbidity parameters of the medium retained inside the shell of this product; a drain pipe is arranged on the bottom end of the shell, and a drain valve is arranged on the drain pipe; after opening the drain valve, it is convenient to discharge the medium inside the shell, thereby reducing the content of particulate matter retained in the inner cavity of the shell due to gravity.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A.

[0018] Figure 3 for Figure 1 A partial enlarged schematic diagram of detail B.

[0019] Figure 4 It is a structural schematic diagram of the utility model.

[0020] Figure 5 It is a structural schematic diagram of the metal scraper of the utility model.

[0021] Figure 6It is a structural schematic diagram of the support plate of the utility model.

[0022] Figure 7 It is a structural schematic diagram of a part of the rotating shaft of the utility model.

[0023] Figure 8 It is a structural schematic diagram of the rotary shaft scraper assembly of the utility model. DETAILED DESCRIPTION

[0024] like Figures 1 to 8 As shown, a cam type scraper flowmeter comprises an outer shell 1 and a measuring head 4, an inner shell 2 is arranged on the inner side of the outer shell 1, the inner shell 2 is made of 630 martensitic stainless steel, an inner liner 3 is arranged on the inner side of the inner shell 2, a drum assembly is arranged on the inner side of the inner liner 3, the outer shell 1 comprises an outer shell body, an inlet pipe arranged on the outer shell body and an outlet pipe arranged on the outer shell body, the outlet pipe and the inlet pipe are respectively located on both sides of the liner 3, an inlet channel and an outlet channel are arranged on the inner shell 2, the inlet channel is located on the inner side of the inlet pipe, and the outlet channel is located on the inner side of the outlet pipe, an outer cover 5 is arranged on the open end of the outer shell 1, the drum assembly comprises an inner cylinder 6 arranged on the inner side of the inner shell 2, an inner cover 7 arranged on the top of the inner shell 2, a rotating shaft 8 arranged on the inner cover 7 and the inner cylinder 6, a cam 9 is arranged on the rotating shaft 8, and a scraper assembly is arranged on the inner cylinder 6; the scraper assembly comprises two metal scrapers 10, a connecting sleeve 11 arranged between the two metal scrapers 10, and each metal The end of the metal scraper 10 close to the cam 9 is provided with a first bearing 12; a scraper bracket is provided at the bottom of the inner cylinder 6, and a support roller 13 is provided between the bottom end of each metal scraper 10 and the scraper bracket, and a first alloy sleeve 14 is provided between each metal scraper 10 and the support roller 13, and a second alloy sleeve 15 is provided on the end of each metal scraper 10 away from the cam 9. The material of the second alloy sleeve 15 and the first alloy sleeve 14 is 304 austenitic stainless steel. A supporting plate 16 is provided on the outer shell 1 below the scraper bracket, and a limiting groove 17 is provided on the supporting plate 16. A first limiting block 18 is provided below the scraper bracket, and the limiting groove 17 and the first limiting block 18 cooperate with each other. A first guide groove 19 is provided on the inner side of the outer shell 1, and a first guide block 20 is provided in the first guide groove 19. The first guide block 20 is installed on the inner shell 2, and the first guide groove 19 extends along the top end of the inner cavity of the outer shell 1 toward the bottom end of the inner cavity of the outer shell 1. Positioning bolts 21 are provided on the inner shell 2 and the outer shell 1.

[0025] The inner cover 7 and the outer cover 5 are respectively provided with lifting rings 22. The device is lifted by lifting the lifting ring 22 installed on the outer cover 5 by lifting equipment, so as to facilitate the movement of the product. After the outer cover 5 and the positioning bolts 21 are removed from the product, the lifting ring 22 installed on the inner cover 7 is lifted by lifting equipment, so as to facilitate the lifting of the inner cover 7, the inner shell 2, the lower cover 34 and the rotating drum assembly installed on the inner side of the liner 3 of the product, so as to facilitate the cleaning of the inner side of the outer shell 1.

[0026] A turbidity sensor 23 is provided in the inner cavity of the shell 1 below the scraper bracket, so as to facilitate the feedback of the turbidity parameters of the medium retained inside the shell 1 of this product; a drain pipe 24 is provided on the bottom end of the shell 1, and a drain valve 25 is provided on the drain pipe 24; after opening the drain valve 25, it is convenient to discharge the medium inside the shell 1, thereby reducing the content of particulate matter retained in the inner cavity of the shell 1 due to gravity.

[0027] The scraper bracket includes a first connecting ring 26, a second bearing 27 arranged between the first connecting ring 26 and the rotating shaft 8, a first fixing ring 28 respectively arranged on both sides of the second bearing 27 and the first connecting ring 26, a first fixing bolt 29 arranged on each first fixing ring 28 and the first connecting ring 26, a second connecting ring 30 arranged below the first connecting ring 26, a first connecting rod 31 arranged between the second connecting ring 30 and the first connecting ring 26, and a support rod 32 arranged on the outer side of the second connecting ring 30. The number of support rollers 13 is several, and the number of support rods 32 corresponds to the number of support rollers 13, and each support rod 32 is mounted with a support roller 13.

[0028] The end of the metal scraper 10 away from the cam 9 and the bottom of the metal scraper 10 are both convex-shaped structures, the inner cavity of the second alloy sleeve 15 matches the shape of the end of the metal scraper 10 away from the cam 9, the inner cavity of the first alloy sleeve 14 matches the shape of the bottom of the metal scraper 10, and the second alloy sleeve 15 and the metal scraper 10 and the first alloy sleeve 14 of the metal scraper 10 are respectively provided with second fixing bolts 33. The bottom of the inner shell 2 is provided with a lower cover 34, the lower cover 34 is located between the scraper bracket and the support plate 16, the first limit block 18 is installed at the bottom end of the lower cover 34, the shaft 8 is installed through the lower cover 34 and the inner cover 7, the number of the first limit blocks 18 is a plurality of, and the plurality of first limit blocks 18 are evenly distributed on the outer side of the shaft 8 in a star shape, and the number of the limit grooves 17 corresponds to the number of the first limit blocks 18. Fifth fixing bolts are respectively arranged on the inner cover 7 and the inner shell 2, the inner shell 2 and the inner cover 7, and the outer shell 1 and the outer cover 5. The second alloy sleeve 15 has a surface facing the inner shell 2 that matches the shape of a part of the inner wall of the inner shell 2.

[0029] A third connecting ring 35 is provided on the rotating shaft 8 below the lower cover 34, a second connecting rod 36 is provided between the third connecting ring 35 and the inner cylinder 6, a third bearing 37 is provided between the third connecting ring 35 and the rotating shaft 8, a second fixing ring 38 is provided on the third bearing 37 and the third connecting ring 35, a third fixing bolt 39 is provided on the second fixing ring 38 and the third connecting ring 35, an adjusting sleeve 40 is provided on the rotating shaft 8 below the third bearing 37, the adjusting sleeve 40 and the third bearing 37 abut against each other, an adjusting groove 41 is provided on the rotating shaft 8 inside the adjusting sleeve 40, the adjusting groove 41 extends from the top end of the rotating shaft 8 to the bottom end of the rotating shaft 8, an adjusting slider 42 is provided in the adjusting groove 41, an adjusting rod 43 is provided on the adjusting slider 42, the adjusting rod 43 and the adjusting sleeve 40 abut against each other, an adjusting screw 44 is provided in the rotating shaft 8 above the adjusting slider 42, an adjusting nut 45 is provided on the adjusting screw 44 above the rotating shaft 8, and the adjusting nut 45 and the adjusting screw 44 are threadedly connected. This makes it easy to adjust the position of the adjusting screw 44 by tightening the adjusting nut 45, and then adjust the position of the adjusting sleeve 40 on the rotating shaft 8 by adjusting the slider 42, so as to fine-tune the position of the inner cylinder 6 that has been installed in place, further improving the installation accuracy.

[0030] The second fixed ring 38 is provided with a sun gear, which is movably mounted on the rotating shaft 8. The inner cover 7 on one side of the rotating shaft 8 is provided with a first transmission shaft, which is a round rod-shaped structure capable of rotating around the central axis of the first transmission shaft. The first transmission shaft inside the inner cover 7 is provided with a planetary gear, which is meshed with the sun gear. The first transmission shaft outside the inner cover 7 is provided with a first transmission gear, and the outer cover 5 above the rotating shaft 8 is provided with a second transmission shaft, which is connected to the measuring head 4 in transmission, and the second transmission gear is provided on the second transmission shaft, which is meshed with the first transmission gear. Thus, in the process of the second fixed ring 38 rotating, the first transmission shaft is driven to rotate by the planetary gear and the sun gear; the first transmission shaft is driven to rotate by the second transmission gear and the first transmission gear, thereby driving the reading of the measuring head 4 to change and output the feedback value.

[0031] A second limiting block 46 is provided between the lower cover 34 and the rotating shaft 8, a second guide groove 47 is provided on the top of the inner cover 7, a second guide block 48 is provided on the rotating shaft 8, the second guide block 48 adopts a square rod-shaped structure, the second guide block 48 is connected to the lower cover 34, the rotating shaft 8 and the second guide block 48 are movably connected, the shape of part of the rotating shaft 8 matches the shape of the second guide block 48, so as to limit the rotating shaft 8; the bottom of the second guide block 48 is installed in the second guide groove 47, the top of the second guide block 48 is provided with a pressing ring 49, and the second guide The diameter of the circumscribed circle at the bottom of the guide block 48 gradually decreases as the height of the second guide block 48 decreases. The second guide block 48 adopts an annular structure composed of a plurality of arc-shaped limit blocks. The second guide block 48 is mounted on the rotating shaft 8. The diameter of the circumscribed circle at the top of the second guide block 48 gradually increases as the height of the second guide block 48 decreases. The shape of the inner cavity of the second guide groove 47 matches the shape of the bottom of the second guide block 48. The shape of the top of the second guide block 48 matches the shape of the bottom of the pressure ring 49. The pressure ring 49 and the inner cover 7 are provided with fourth fixing bolts 50. The number of the fourth fixing bolts 50 is a plurality, and the plurality of fourth fixing bolts 50 are distributed in a star shape on the outside of the central axis of the second guide block 48. Tighten the fourth fixing bolt 50 in sequence, first use the structural matching relationship between the second guide block 48 and the pressure ring 49 to make the second guide block 48 generate a downward force, when all the fourth fixing bolts 50 are tightened, the second guide block 48 clamps the rotating shaft 8 and uses the structural matching relationship between the second guide block 48 and the second guide groove 47 to limit the position of the top of the rotating shaft 8, finally making the rotating shaft 8 reach the required installation state.

[0032] The usage of this product is as follows: Figures 1 to 8 As shown, the following steps are included:

[0033] First, the upstream medium enters the cavity between the inner shell 2 and the inner cylinder 6 through the inlet pipe and the inlet channel in turn. The medium entering the cavity between the inner shell 2 and the inner cylinder 6 pushes the scraper assembly to push the inner cylinder 6 to rotate. The rotation of the inner cylinder 6 drives the scraper assembly to rotate. The cam 9 guides the first bearing 12 to drive the scraper assembly to move in translation. Two adjacent scraper assemblies, the inner shell 2 and the inner cylinder 6 form a measuring cavity on the side away from the liner 3. When the measuring cavity is formed, the metal scraper 10 in the scraper assembly is close to the inner shell 2. Finally, as the inner cylinder 6 continues to rotate, the scraper assembly is driven to continue to rotate. When the scraper assembly moves to the side close to the liner 3, a metal scraper 10 in the scraper assembly close to the liner 3 is completely retracted to the inner cylinder 6, accompanied by the metered medium being discharged to the downstream pipeline through the outlet channel and the outlet pipe in turn.

[0034] After the product has run for a preset time, it should be inspected and maintained, including the following steps:

[0035] S1. Remove the outer cover 5 and the positioning bolts 21, and then use the lifting ring 22 on the inner cover 7 to lift the inner shell 2, the inner cover 7 and the components inside the inner shell 2 and the inner cover 7 out of the outer shell 1 as a whole, use the drain pipe 24 to empty the remaining medium in the outer shell 1 and thoroughly clean the inside of the outer shell 1.

[0036] S2. Further remove the inner cover 7 from the inner shell 2 and remove the drum assembly from the inner shell 2, and observe whether there are any scratches on the inner wall of the inner shell 2 that may affect the measurement. If so, replace the inner shell 2. Then, rotate the inner drum 6 so that the second alloy sleeves 15 on the several metal scrapers 10 are exposed in turn and observed in turn to see if there are any scratches that may affect the measurement. If so, replace the corresponding damaged second alloy sleeves 15, and reinstall the drum assembly with the replaced second alloy sleeves 15 back into the inner shell 2 and reinstall the inner cover 7.

[0037] S3. After the repair, the inner shell 2, the inner cover 7 and the drum assembly inside the inner shell 2 and the inner cover 7 are reinstalled back into the outer shell 1. Specifically, first, the guiding relationship between the first guide groove 19 and the first guide block 20 is used to determine the initial direction of the inner shell 2 installed in the outer shell 1. Then, as the height of the inner shell 2 is lowered until it reaches the bottom, the first limit block 18 is installed on the limit groove 17, that is, the final installation position of the inner shell 2 in the outer shell 1 is reached, and the outer cover 5 and the positioning bolts 21 are reinstalled, thus completing the inspection and maintenance of this product.

[0038] It should be noted that during the use of this product, the information fed back by the turbidity sensor 23 should be observed in a timely manner. When the reading fed back by the turbidity sensor 23 exceeds the preset range, the drain valve 25 should be opened to discharge part of the medium in the outer shell 1. At this time, the medium will carry the particles at the bottom and be discharged from this product together, reducing the impact of the particles remaining at the bottom of the inner cavity of the outer shell 1 of this product due to gravity on the scraper assembly and the inner shell 2.

[0039] Through this embodiment, a second alloy sleeve 15 is installed on the end of the metal scraper 10 of this product away from the cam 9. The material of the second alloy sleeve 15 is 304 austenitic stainless steel, and the material of the inner shell 2 is 630 martensitic stainless steel. Even if particles are embedded and cause scratches, since the Mohs hardness of 630 martensitic stainless steel is greater than that of 304 austenitic stainless steel, the second alloy sleeve 15 will be scratched first. After disassembling this product, replacing the second alloy sleeve 15 can achieve the technical purpose of rapid maintenance, thereby reducing the difficulty of maintenance caused by scratches caused by embedded particles.

[0040] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A cam-type scraper flowmeter, comprising an outer shell (1), an inner shell (2), an inner liner (3), a drum assembly and a measuring head (4), wherein an outer cover (5) is provided on the open end of the outer shell (1), and characterized in that: The rotary drum assembly comprises an inner drum (6) arranged on the inner side of the inner shell (2), an inner sealing cover (7) arranged on the top of the inner shell (2), a rotating shaft (8) arranged on the inner sealing cover (7) and the inner drum (6), a cam (9) arranged on the rotating shaft (8), and a scraper assembly arranged on the inner drum (6); the scraper assembly comprises two metal scrapers (10), a connecting sleeve (11) arranged between the two metal scrapers (10), and a first bearing (12) arranged at one end of each metal scraper (10) close to the cam (9); a scraper bracket is arranged at the bottom of the inner drum (6), a supporting roller (13) is arranged between the bottom end of each metal scraper (10) and the scraper bracket, and a support roller (13) is arranged between each metal scraper (10) and the supporting roller (13). A first alloy sleeve (14) is respectively provided, and a second alloy sleeve (15) is respectively provided on one end of each metal scraper (10) away from the cam (9). A supporting plate (16) is provided on the outer shell (1) below the scraper bracket, and a limiting groove (17) is provided on the supporting plate (16). A first limiting block (18) is provided below the scraper bracket, and the limiting groove (17) and the first limiting block (18) cooperate with each other. A first guide groove (19) is provided on the inner side of the outer shell (1), and a first guide block (20) is provided in the first guide groove (19). The first guide groove (19) extends along the top end of the inner cavity of the outer shell (1) toward the bottom end of the inner cavity of the outer shell (1), and positioning bolts (21) are provided on the inner shell (2) and the outer shell (1).

2. The cam-type scraper flowmeter according to claim 1, characterized in that: The inner cover (7) and the outer cover (5) are each provided with a lifting ring (22).

3. The cam-type scraper flowmeter according to claim 1, characterized in that: A turbidity sensor (23) is arranged in the inner cavity of the shell (1) below the scraper bracket, a sewage pipe (24) is arranged on the bottom end of the shell (1), and a sewage valve (25) is arranged on the sewage pipe (24).

4. The cam-type scraper flowmeter according to claim 1, characterized in that: The scraper support comprises a first connecting ring (26), a second bearing (27) arranged between the first connecting ring (26) and the rotating shaft (8), first fixing rings (28) respectively arranged on both sides of the second bearing (27) and the first connecting ring (26), a first fixing bolt (29) arranged on each first fixing ring (28) and the first connecting ring (26), a second connecting ring (30) arranged below the first connecting ring (26), a first connecting rod (31) arranged between the second connecting ring (30) and the first connecting ring (26), and a supporting rod (32) arranged outside the second connecting ring (30), wherein the number of supporting rollers (13) is a plurality, the number of supporting rods (32) corresponds to the number of supporting rollers (13), and each supporting rod (32) is mounted with a supporting roller (13).

5. The cam-type scraper flowmeter according to claim 1, characterized in that: The end of the metal scraper (10) away from the cam (9) and the bottom end of the metal scraper (10) both adopt a convex structure, the inner cavity of the second alloy sleeve (15) and the shape of the end of the metal scraper (10) away from the cam (9) match each other, the inner cavity of the first alloy sleeve (14) and the shape of the bottom end of the metal scraper (10) match each other, and the second alloy sleeve (15) and the metal scraper (10) as well as the first alloy sleeve (14) of the metal scraper (10) are respectively provided with a second fixing bolt (33).

6. The cam-type scraper flowmeter according to claim 1, characterized in that: A lower cover (34) is provided at the bottom of the inner shell (2), and the lower cover (34) is located between the scraper bracket and the support plate (16). The first limit block (18) is installed at the bottom end of the lower cover (34), and the rotating shaft (8) is installed through the lower cover (34) and the inner cover (7). The number of the first limit blocks (18) is a plurality, and the plurality of first limit blocks (18) are evenly distributed in a star shape on the outer side of the rotating shaft (8), and the number of the limit grooves (17) corresponds to the number of the first limit blocks (18).

7. The cam-type scraper flowmeter according to claim 6, characterized in that: A third connecting ring (35) is provided on the rotating shaft (8) below the lower cover (34); a second connecting rod (36) is provided between the third connecting ring (35) and the inner cylinder (6); a third bearing (37) is provided between the third connecting ring (35) and the rotating shaft (8); a second fixing ring (38) is provided on the third bearing (37) and the third connecting ring (35); a third fixing bolt (39) is provided on the second fixing ring (38) and the third connecting ring (35); an adjusting sleeve (40) is provided on the rotating shaft (8) below the third bearing (37); and the adjusting sleeve (40) and the third bearing (37) are provided on the rotating shaft (8). ), an adjusting groove (41) is provided on the rotating shaft (8) inside the adjusting sleeve (40), the adjusting groove (41) extending from the top end of the rotating shaft (8) to the bottom end of the rotating shaft (8), an adjusting slider (42) is provided in the adjusting groove (41), an adjusting rod (43) is provided on the adjusting slider (42), the adjusting rod (43) and the adjusting sleeve (40) are against each other, an adjusting screw rod (44) is provided in the rotating shaft (8) above the adjusting slider (42), an adjusting nut (45) is provided on the adjusting screw rod (44) above the rotating shaft (8), and the adjusting nut (45) and the adjusting screw rod (44) are threadedly connected.

8. The cam-type scraper flowmeter according to claim 6, characterized in that: A second limiting block (46) is arranged between the lower cover (34) and the rotating shaft (8), a second guide groove (47) is arranged on the top of the inner cover (7), a second guide block (48) is arranged on the rotating shaft (8), the bottom of the second guide block (48) is installed in the second guide groove (47), a pressure ring (49) is arranged on the top of the second guide block (48), the diameter of the circumscribed circle at the bottom of the second guide block (48) gradually decreases as the height of the second guide block (48) decreases, and the diameter of the circumscribed circle at the top of the second guide block (48) gradually increases as the height of the second guide block (48) decreases, the shape of the inner cavity of the second guide groove (47) matches the shape of the bottom of the second guide block (48), and the shape of the top of the second guide block (48) matches the shape of the bottom of the pressure ring (49).

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