Mud scraping assembly and wet type scraper machine thereof

Abstract

The invention discloses a mud scraping assembly. The mud scraping assembly is rotationally arranged in the discharging end of a wet type scraper and is coupled with the mud carrying end face of a scraper of the wet type scraper in the moving process. Compared with the prior art, pressure towards the discharge port is formed on the sludge on the sludge loading end face of the scraper, so that the sludge with the water content of 60-65% is effectively unloaded at the discharge port, and the conveying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wet scrapers, and in particular to a mud scraping assembly and a wet scraper thereof. Background Art

[0002] Wet scraper conveyor, also known as wet scraper conveyor or plate chain feeder, is a closed scraper conveyor specially used for conveying sticky and wet materials.

[0003] The material is transported from one end to the other by the movement of the scraper. Specifically, the motor drives the reducer, which in turn drives the scraper sprocket. The scraper chain drives the scraper to slowly move forward. The material is pushed by the scraper and moves along the conveyor track. When the scraper reaches the other end, the material is unloaded at the discharge port, completing the conveying process.

[0004] However, during the sludge transportation process of the wet scraper, the sludge has a strong adhesiveness due to its water content of 60%-65%. The sludge is squeezed and adhered to each other during transportation, and adheres to the scraper blades. It cannot fall from the scraper blades by its own weight. The sludge cannot be effectively unloaded at the discharge port, which seriously affects the transportation efficiency. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a sludge scraper assembly and a wet scraper thereof, so as to solve the problem in the prior art that the sludge sticks to the scraper blade of the wet scraper and cannot fall off the scraper blade by its own weight, resulting in the sludge cannot be effectively unloaded at the discharge port, which seriously affects the conveying efficiency.

[0006] To achieve the above objectives, the first aspect of the present invention adopts the following technical solution: a scraper assembly is rotatably arranged in the discharge end of the wet scraper and is coupled with the mud-carrying end surface of the scraper of the wet scraper during movement.

[0007] Further, including:

[0008] A rotating shaft, the rotating shaft being rotatably disposed in the discharge end of the wet scraper;

[0009] A connecting sleeve, wherein the connecting sleeve is fixedly mounted on the rotating shaft;

[0010] The scraping parts are multiple and circumferentially connected to the outside of the connecting sleeve. The multiple scraping parts are coupled with the mud-carrying end surface of the scraper of the wet scraper during movement.

[0011] Furthermore, each of the scraping parts includes:

[0012] scraper;

[0013] A connecting structure is connected between the scraper blade and the connecting sleeve.

[0014] Furthermore, the connection structure includes:

[0015] A connecting plate, the connecting plate being attached to the back of the scraping surface of the scraper blade and arranged along the length direction of the scraper blade, and being fixed to the scraper blade by a plurality of locking members;

[0016] There is at least one connecting bar connected between the connecting plate and the connecting sleeve.

[0017] Furthermore, the plurality of scraping parts are fixedly connected via at least one reinforcement structure.

[0018] Furthermore, the scraping surface of the scraper is coated with an anti-sticking layer made of an anti-sticking coating.

[0019] Furthermore, the raw materials of the anti-stick coating include the following components in parts by weight:

[0020] 30-50 parts of polytetrafluoroethylene;

[0021] 20-30 parts of epoxy resin;

[0022] 5-10 parts of molybdenum disulfide / silicon dioxide nanocomposite material;

[0023] 10-30 parts of butanone;

[0024] 1-3 parts of silane coupling agent.

[0025] The anti-stick coating comprises polytetrafluoroethylene and epoxy resin as main film-forming substances; a molybdenum disulfide / silicon dioxide nanocomposite material is used as a maintenance filler to achieve wear resistance and reduce friction; butanone is used as a solvent, and a silane coupling agent is used to improve the adhesion of the coating on the substrate; and the inventors unexpectedly discovered that the molybdenum disulfide / silicon dioxide nanocomposite material can also be combined with a silane coupling agent to enhance the adhesion of the coating on the substrate.

[0026] Furthermore, the preparation method of the molybdenum disulfide / silicon dioxide nanocomposite material is as follows:

[0027] Select molybdenum disulfide powder and silicon dioxide nanopowder;

[0028] Molybdenum disulfide powder and silicon dioxide nanopowder were added into a planetary ball mill at a weight ratio of 1:0.5-0.8, and anhydrous ethanol was added for ball milling.

[0029] After ball milling, vacuum drying and sieving are carried out in sequence to obtain a mixed powder;

[0030] The mixed powder is placed in a hot pressing sintering furnace and pre-sintered at 200-400°C for 0.5-1h, then sintered at 800-900°C and 1000-1200°C for 1-2h respectively, and cooled to room temperature after sintering.

[0031] After cooling, the molybdenum disulfide / silicon dioxide nanocomposite material is obtained by grinding and screening.

[0032] Furthermore, the preparation method of the anti-sticking coating is as follows:

[0033] Mix epoxy resin and butanone and stir at 40°C until completely dissolved;

[0034] Then polytetrafluoroethylene was added for ultrasonic dispersion;

[0035] Then, the molybdenum disulfide / silicon dioxide nanocomposite was added and stirred at a speed of 500-800 rpm for 0.5-1 h;

[0036] Finally, add the silane coupling agent and continue stirring for 0.5-1h.

[0037] The second aspect of the present invention adopts the following technical solution: a wet scraper, comprising a mud scraping assembly as described in the first aspect of the present invention.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The present invention designs a sludge scraper assembly that is rotatably arranged in the discharge end of the wet scraper and is coupled with the mud-carrying end surface of the scraper of the wet scraper during movement, thereby exerting pressure on the sludge on the mud-carrying end surface of the scraper in the direction of the discharge port, effectively unloading the sludge with a moisture content of 60% to 65% at the discharge port, thereby improving the conveying efficiency; wherein, the mud-stained area on the scraper is reduced from more than 80% to less than 20%, thereby ensuring the normal operation of the wet scraper during load operation and meeting the process design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a partial structural diagram of a mud scraping assembly in the present invention;

[0041] Figure 2 A schematic diagram of the cooperation between a scraper assembly and a scraper in a wet scraper machine according to the present invention;

[0042] Figure 3 It is a partial structural schematic diagram of a wet scraper in the present invention.

[0043] The reference numerals in the drawings of the specification include: connecting sleeve 1 , scraping portion 2 , scraping blade 21 , connecting plate 22 , connecting strip 23 , reinforcing structure 3 , scraping blade 4 . DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below through specific embodiments:

[0045] Example 1

[0046] 1. Preparation of MoS2 / SiO2 Nanocomposites

[0047] Material selection: Molybdenum disulfide powder with a purity of ≥99.9% and a particle size of 1-5 μm and silicon dioxide nanopowder with a purity of ≥99.5% and a particle size of 20-50 nm are selected.

[0048] Mixing: Molybdenum disulfide powder and silicon dioxide nanopowder are put into a planetary ball mill at a weight ratio of 1:0.5, and anhydrous ethanol is added at a liquid-to-solid ratio of 2:1 (weight ratio) for ball milling; wherein the rotation speed of the planetary ball mill is 300 rpm and the running time is 4 hours.

[0049] Drying: The suspension after ball milling was vacuum dried at 60°C for 12 h and then passed through a 200-mesh sieve to obtain a mixed powder.

[0050] Pre-sintering: the mixed powder was put into a hot pressing sintering furnace, the temperature in the hot pressing sintering furnace was raised to 300°C at a rate of 10°C / min, and kept at that temperature for 0.8h (argon protection and pressure of 5MPa were used in the hot pressing sintering furnace).

[0051] Segmented sintering:

[0052] The first stage: the temperature in the hot pressing sintering furnace was raised to 850°C at a rate of 10°C / min and kept at that temperature for 1.5 hours. The pressure in the hot pressing sintering furnace was 10 MPa.

[0053] The second stage: the temperature in the hot pressing sintering furnace is raised to 1100°C at 5°C / min and kept at this temperature for 1.5 hours. The pressure in the hot pressing sintering furnace is 15 MPa.

[0054] Cooling: After cooling to 200℃ with the furnace, turn off the pressure and cool naturally to room temperature.

[0055] Post-processing:

[0056] The sintered body prepared above was lightly ground with an agate mortar until the particles were loose, and then sieved through 400 mesh and 200 mesh in sequence, and the powder in the 200-400 mesh range was collected as the final product.

[0057] 2. Preparation of anti-stick coating

[0058] Weigh 40 parts of polytetrafluoroethylene, 25 parts of epoxy resin, 8 parts of molybdenum disulfide / silicon dioxide nanocomposite, 20 parts of butanone, and 2 parts of silane coupling agent;

[0059] Put epoxy resin and butanone into a container and stir at 300 rpm at 40°C until completely dissolved;

[0060] Then, polytetrafluoroethylene was added into the container and the container was placed in an ultrasonic disperser for ultrasonic dispersion at room temperature for 15 minutes;

[0061] The container was removed from the ultrasonic disperser, and then the molybdenum disulfide / silicon dioxide nanocomposite was added to the container and stirred at a speed of 650 rpm for 0.8 h;

[0062] Finally, add silane coupling agent and continue stirring for 0.8h.

[0063] Example 2

[0064] 1. Preparation of MoS2 / SiO2 Nanocomposites

[0065] Material selection: Molybdenum disulfide powder with a purity of ≥99.9% and a particle size of 1-5 μm and silicon dioxide nanopowder with a purity of ≥99.5% and a particle size of 20-50 nm are selected.

[0066] Mixing: Molybdenum disulfide powder and silicon dioxide nanopowder are put into a planetary ball mill at a weight ratio of 1:0.8, and anhydrous ethanol is added at a liquid-to-solid ratio of 2:1 (weight ratio) for ball milling; wherein the rotation speed of the planetary ball mill is 300 rpm and the running time is 4 hours.

[0067] Drying: The suspension after ball milling was vacuum dried at 60°C for 12 h and then passed through a 200-mesh sieve to obtain a mixed powder.

[0068] Pre-sintering: the mixed powder was put into a hot pressing sintering furnace, the temperature in the hot pressing sintering furnace was raised to 400°C at a rate of 10°C / min, and kept at that temperature for 0.5h (argon protection and pressure of 6MPa were used in the hot pressing sintering furnace).

[0069] Segmented sintering:

[0070] The first stage: the temperature in the hot pressing sintering furnace was raised to 900°C at a rate of 10°C / min and kept at that temperature for 1 hour. The pressure in the hot pressing sintering furnace was 10 MPa.

[0071] The second stage: the temperature in the hot pressing sintering furnace is raised to 1200°C at 5°C / min and kept at this temperature for 1 hour. The pressure in the hot pressing sintering furnace is 15MPa.

[0072] Cooling: After cooling to 200℃ with the furnace, turn off the pressure and cool naturally to room temperature.

[0073] Post-processing:

[0074] The sintered body prepared above was lightly ground with an agate mortar until the particles were loose, and then sieved through 400 mesh and 200 mesh in sequence, and the powder in the 200-400 mesh range was collected as the final product.

[0075] 2. Preparation of anti-stick coating

[0076] Weigh 50 parts of polytetrafluoroethylene, 30 parts of epoxy resin, 10 parts of molybdenum disulfide / silicon dioxide nanocomposite, 30 parts of butanone, and 3 parts of silane coupling agent;

[0077] Put epoxy resin and butanone into a container and stir at 300 rpm at 50°C until completely dissolved;

[0078] Then, polytetrafluoroethylene was added into the container and the container was placed in an ultrasonic disperser for ultrasonic dispersion at room temperature for 15 minutes;

[0079] The container was removed from the ultrasonic disperser, and then the molybdenum disulfide / silicon dioxide nanocomposite was added to the container and stirred at 800 rpm for 0.5 h;

[0080] Finally, add the silane coupling agent and continue stirring for 0.5h.

[0081] Example 3

[0082] 1. Preparation of MoS2 / SiO2 Nanocomposites

[0083] Material selection: Molybdenum disulfide powder with a purity of ≥99.9% and a particle size of 1-5 μm and silicon dioxide nanopowder with a purity of ≥99.5% and a particle size of 20-50 nm are selected.

[0084] Mixing: Molybdenum disulfide powder and silicon dioxide nanopowder are put into a planetary ball mill at a weight ratio of 1:0.6, and anhydrous ethanol is added at a liquid-to-solid ratio of 2:1 (weight ratio) for ball milling; wherein the rotation speed of the planetary ball mill is 300 rpm and the running time is 4 hours.

[0085] Drying: The suspension after ball milling was vacuum dried at 60°C for 12 h, and then passed through a 200-mesh sieve to obtain a mixed powder with a particle size not greater than 200 mesh.

[0086] Pre-sintering: the mixed powder was put into a hot pressing sintering furnace, the temperature in the hot pressing sintering furnace was raised to 200°C at a rate of 10°C / min, and kept at that temperature for 1 hour (argon protection in the hot pressing sintering furnace and the pressure was 5 MPa).

[0087] Segmented sintering:

[0088] The first stage: the temperature in the hot pressing sintering furnace is raised to 800°C at a rate of 10°C / min and kept at this temperature for 2 hours. The pressure in the hot pressing sintering furnace is 10 MPa.

[0089] The second stage: the temperature in the hot pressing sintering furnace is raised to 1000°C at 5°C / min and kept at this temperature for 2 hours. The pressure in the hot pressing sintering furnace is 15MPa.

[0090] Cooling: After cooling to 200℃ with the furnace, turn off the pressure and cool naturally to room temperature.

[0091] Post-processing:

[0092] The sintered body prepared above was lightly ground with an agate mortar until the particles were loose, and then sieved through 400 mesh and 200 mesh in sequence, and the powder in the 200-400 mesh range was collected as the final product.

[0093] 2. Preparation of anti-stick coating

[0094] Weigh 30 parts of polytetrafluoroethylene, 20 parts of epoxy resin, 5 parts of molybdenum disulfide / silicon dioxide nanocomposite, 10 parts of butanone, and 1 part of silane coupling agent;

[0095] Put epoxy resin and butanone into a container and stir at 45°C and 300 rpm until completely dissolved;

[0096] Then, polytetrafluoroethylene was added into the container and the container was placed in an ultrasonic disperser for ultrasonic dispersion at room temperature for 15 minutes;

[0097] The container was removed from the ultrasonic disperser, and then the molybdenum disulfide / silicon dioxide nanocomposite was added to the container and stirred at 500 rpm for 1 h;

[0098] Finally, the silane coupling agent was added and stirring was continued for 1 h.

[0099] Comparative Example 1

[0100] The difference from Example 1 is that the molybdenum disulfide / silicon dioxide nanocomposite material is not prepared, and the molybdenum disulfide / silicon dioxide nanocomposite material is replaced by molybdenum disulfide and silicon dioxide in the preparation of the anti-stick coating, the total amount of molybdenum disulfide and silicon dioxide is equal to the amount of the molybdenum disulfide / silicon dioxide nanocomposite material, and the weight ratio of molybdenum disulfide to silicon dioxide is 1:0.5.

[0101] Comparative Example 2

[0102] The difference from Example 1 is that the molybdenum disulfide / silicon dioxide nanocomposite material is not prepared, but the molybdenum disulfide / silicon dioxide nanocomposite material is replaced by an equal amount of molybdenum disulfide in the preparation of the anti-stick coating.

[0103] The adhesion of the coatings prepared in Examples 1-3 and Comparative Examples 1-2 was tested according to the standard of GB / T 9286-1998. The test results are shown in Table 1.

[0104] Grade (adhesion) Example 1 0 Example 2 0 Example 3 0 Comparative Example 1 2 Comparative Example 2 3

[0105] Table 1

[0106] The coatings prepared in Examples 1-3 and Comparative Examples 1-2 were sprayed on different substrates with a spraying thickness of 12 μm, dried and cured by baking at 190° C. for 9 minutes, and then subjected to a pencil hardness test to obtain the test results shown in Table 2.

[0107] Pencil hardness Example 1 4H Example 2 4H Example 3 3H Comparative Example 1 H Comparative Example 2 HB

[0108] Table 2

[0109] The coatings prepared in Examples 1-3 and Comparative Examples 1-2 were sprayed on different substrates with a spray thickness of 12 μm and dried and solidified at 190° C. for 9 minutes. The anti-adhesion performance was then determined by a contact angle meter.

[0110] The larger the contact angle, the better the anti-adhesion performance. The contact angle is tested with deionized water as the medium. The test results are shown in Table 3.

[0111] Contact angle (°) Example 1 158.2 Example 2 142.8 Example 3 152.5 Comparative Example 1 126.2 Comparative Example 2 108.4

[0112] Table 3

[0113] Example 4

[0114] like Figure 1 and Figure 2 An embodiment of the present invention provides a mud scraping assembly, which is rotatably arranged in the discharge end of the wet scraper 4 machine and is coupled with the mud-carrying end surface of the scraper 4 of the wet scraper 4 machine during movement.

[0115] The present invention designs a sludge scraper assembly that is rotatably arranged in the discharge end of the wet scraper 4 machine and is coupled with the mud-carrying end surface of the scraper 4 of the wet scraper 4 machine during movement, thereby exerting pressure on the sludge on the mud-carrying end surface of the scraper 4 in the direction of the discharge port, effectively unloading the sludge with a moisture content of 60% to 65% at the discharge port, thereby improving the conveying efficiency; wherein, the mud-stained area on the scraper 4 is reduced from more than 80% to less than 20%, thereby ensuring the normal operation of the wet scraper 4 machine during load operation and meeting the process design requirements.

[0116] Specifically, the scraping assembly includes a rotating shaft, a connecting sleeve 1 and a scraping part 2. The rotating shaft is rotatably arranged in the discharge end of the wet scraper 4 machine; the connecting sleeve 1 is fixedly sleeved on the rotating shaft; there are multiple scraping parts 2 and they are circumferentially connected to the outside of the connecting sleeve 1. The multiple scraping parts 2 are coupled with the mud-carrying end surface of the scraper 4 of the wet scraper 4 machine during movement.

[0117] In this embodiment, a reduction motor is fixedly connected to the outer wall of the wet scraper 4, and a belt is used to drive the reduction motor and one end of the rotating shaft. During operation of the wet scraper 4, the reduction motor also operates to drive the rotating shaft. During the rotation of the rotating shaft, the multiple scraping parts 2 are driven around the rotating shaft through the connecting sleeve 1. The multiple scraping parts 2 are sequentially coupled with the mud-carrying end surface of the wet scraper 4, applying pressure on the mud-carrying end surface of the scraper 4 toward the discharge port, effectively unloading the sludge at the discharge port.

[0118] Based on the above scheme:

[0119] Each of the scraping parts 2 includes a scraping blade 21 and a connecting structure, and the connecting structure is connected between the scraping blade 21 and the connecting sleeve 1 .

[0120] Specifically, the connecting structure includes a connecting plate 22 and a connecting strip 23. The connecting plate 22 is attached to the back of the scraping surface of the scraper 21 and is arranged along the length direction of the scraper 21. The connecting plate 22 and the scraper 21 are fixed by multiple locking parts; there is at least one connecting strip 23 and it is connected between the connecting plate 22 and the connecting sleeve 1.

[0121] In this embodiment, there are five scraping parts 2, and the locking parts are matched bolts and nuts. The bolts pass through the connecting plate 22 and the scraping blade 21 and are connected to the nuts to stably fix the connecting plate 22 and the scraping blade 21 together; there are two connecting strips 23 in each scraping part 2, and the connecting plate 22 and the connecting sleeve 1 are connected by two parallel and spaced connecting strips 23 to ensure that the connecting plate 22 and the connecting sleeve 1 are stably connected.

[0122] In order to further improve the structural strength of the scraper assembly, the plurality of scraper parts 2 are fixedly connected via at least one reinforcement structure 3 .

[0123] In this embodiment, the reinforcement structure 3 is specifically a reinforcement ring, and one reinforcement ring is connected to the five connecting strips 23 connected to the same side of the connecting sleeve 1 to improve the overall structural strength; specifically, there are two reinforcement rings, and the two reinforcement rings are fixedly connected to the connecting strips 23 on different sides of the connecting sleeve 1.

[0124] The specific working process is as follows:

[0125] During the operation of the wet scraper 4 machine, the reduction motor starts running, and the five scrapers 21 make circular motion on the outside of the rotating shaft with the rotating shaft as the center. The five scrapers 21 cooperate with the moving scraper 4 of the wet scraper 4 machine in turn to couple the mud-carrying end face of the scraper 4 moved to the discharge end of the wet scraper 4 machine, and form a thrust toward the discharge port on the sludge adhered to the mud-carrying end face of the scraper 4, so that the sludge adhered to the mud-carrying end face of the scraper 4 is effectively pushed down to the discharge port for discharge.

[0126] Since the scraper blade 21 moves in a circular motion, the sludge will not adhere to the scraper blade 21 and will not fall off due to the centrifugal force.

[0127] Example 5

[0128] In order to further reduce the adhesion of sludge on the scraping surface of the scraper 21, on the basis of Example 4, an anti-sticking layer formed by the anti-sticking coating prepared in the above Example 1 is coated on the scraping surface of each scraper 21, wherein the thickness of the anti-sticking layer is 1 cm.

[0129] Example 6

[0130] like Figure 3 An embodiment of the present invention proposes a wet scraper 4 machine, including a sludge scraping assembly as described in Example 4 or Example 5, which effectively unloads sludge with a moisture content of 60% to 65% at the discharge port, thereby improving the sludge transportation efficiency.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A mud scraping assembly, characterized in that: The rotary device is arranged in the discharge end of the wet scraper and is coupled with the mud-carrying end surface of the scraper of the wet scraper during movement.

2. A mud scraping assembly according to claim 1, characterized in that: include: A rotating shaft, the rotating shaft being rotatably disposed in the discharge end of the wet scraper; A connecting sleeve, wherein the connecting sleeve is fixedly mounted on the rotating shaft; The scraping parts are multiple and circumferentially connected to the outside of the connecting sleeve. The multiple scraping parts are coupled with the mud-carrying end surface of the scraper of the wet scraper during movement.

3. A mud scraping assembly according to claim 2, characterized in that: Each of the scraping parts comprises: scraper; A connecting structure is connected between the scraper blade and the connecting sleeve.

4. A mud scraping assembly according to claim 3, characterized in that: The connection structure includes: A connecting plate, the connecting plate being attached to the back of the scraping surface of the scraper blade and arranged along the length direction of the scraper blade, and being fixed to the scraper blade by a plurality of locking members; There is at least one connecting bar connected between the connecting plate and the connecting sleeve.

5. A mud scraping assembly according to any one of claims 2 to 4, characterized in that: The plurality of mud scraping parts are fixedly connected via at least one reinforcement structure.

6. The mud scraping assembly according to claim 3, characterized in that: The scraping surface of the scraper is coated with an anti-sticking layer made of anti-sticking coating.

7. The mud scraping assembly according to claim 6, characterized in that: The raw materials of the anti-stick coating include the following components in parts by weight: 30-50 parts of polytetrafluoroethylene; 20-30 parts of epoxy resin; 5-10 parts of molybdenum disulfide / silicon dioxide nanocomposite material; 10-30 parts of butanone; 1-3 parts of silane coupling agent.

8. The mud scraping assembly according to claim 7, characterized in that: The preparation method of the molybdenum disulfide / silicon dioxide nanocomposite material is as follows: Select molybdenum disulfide powder and silicon dioxide nanopowder; Molybdenum disulfide powder and silicon dioxide nanopowder were added into a planetary ball mill at a weight ratio of 1:0.5-0.8, and anhydrous ethanol was added for ball milling. After ball milling, vacuum drying and sieving are carried out in sequence to obtain a mixed powder; The mixed powder is placed in a hot pressing sintering furnace and pre-sintered at 200-400°C for 0.5-1h, then sintered at 800-900°C and 1000-1200°C for 1-2h respectively, and cooled to room temperature after sintering. After cooling, the molybdenum disulfide / silicon dioxide nanocomposite material is obtained by grinding and screening.

9. The mud scraping assembly according to claim 7, characterized in that: The preparation method of the anti-stick coating is as follows: Mix epoxy resin and butanone, and stir at 40-50℃ until completely dissolved; Then polytetrafluoroethylene was added for ultrasonic dispersion; Then, the molybdenum disulfide / silicon dioxide nanocomposite was added and stirred at 500-800 rpm for 0.5-1 h; Finally, add the silane coupling agent and continue stirring for 0.5-1h.

10. A wet scraper, characterized in that: The utility model comprises a mud scraping assembly as claimed in any one of claims 1 to 9.

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