A self-cleaning stirring and cleaning machine for granular materials and its working method

Abstract

This invention discloses a self-cleaning mixing and washing machine for granular materials and its working method, relating to the technical field of material cleaning equipment. It includes a base, an outer barrel mounted on the base, and an inner barrel coaxially mounted within the outer barrel cavity. The bottom plate of the inner barrel has a discharge hole connected to a discharge pipe, and a pump is mounted on the discharge pipe. A top cover is provided at the top opening of the inner barrel, and the top cover has a feed hole, several cleaning liquid inlet valves, a supernatant hole, an internal connecting hole, a vent hole connected to a vent pipe, an air inlet hole connected to an air inlet pipe, a motor, a first spray pipe hole, and a second spray pipe hole. A ring cover is connected to the top opening of the outer barrel; the ring cover has an external connecting hole. The motor is connected to a mixing shaft located inside the inner barrel. A suction pipe is vertically inserted into the supernatant hole, and the top end of the suction pipe is connected to a pump mounted on a lifting device. The lifting device is connected to the base. This invention's self-cleaning mixing and washing machine for granular materials solves the problems of high cleaning liquid consumption, low cleaning efficiency, and unstable cleaning quality in existing cleaning equipment.

Description

Technical Field

[0001] This invention relates to the field of material cleaning equipment technology, and more specifically to a granular material self-cleaning mixing and cleaning machine and its working method. Background Technology

[0002] Granular materials such as silica sand and quartz sand are essential raw materials for high-tech industries such as photovoltaic cells, semiconductors, fiber optic communications, specialty glass, precision instruments, aerospace, and defense. With the rapid development of these high-tech industries, the purity requirements for these materials are becoming increasingly stringent. Granular materials need to be cleaned to remove impurities.

[0003] Pickling or chemical treatment is an essential step in the production of ultrapure quartz sand or silica sand. Essentially, it involves using chemical reagents to treat the quartz sand, removing iron oxides and hydroxides precipitated on the surface or within the cracks, as well as fine impurities embedded in the quartz particles. This is because the crushing and physical purification of quartz ore can only remove impurities present individually within the quartz sand, not those embedded in the surface of the quartz particles. The waste acid solution after pickling quartz sand contains a high concentration of impurity metal elements; therefore, a cleaning process is necessary to remove the waste acid solution and obtain high-purity pickled quartz sand.

[0004] Patent CN102029271A discloses a quartz sand purification and cleaning device. It comprises a tank with an upper cover and a lower end cap. The upper cover has a feeder, a liquid inlet, a sight glass, a vent, and a heating vent. A heating vent pipe extends from the upper cover through the heating vent and is connected to an external heat source via a pipeline. The liquid inlet contains a water inlet and an acid inlet. The lower end cap has a filter and a discharge port, with a backwash port connected to the discharge port. This patent discloses a quartz sand purification and cleaning method; acid washing, water washing, and filtration are performed within the same tank, simplifying the operation, shortening the work cycle, and improving production efficiency. The closed-loop operation further ensures product purity; direct heating accelerates mass transfer and speeds up the cleaning reaction. To achieve ideal cleaning results for acid-washed quartz sand, methods such as turning, stirring, and backwashing are mainly used to create relative movement between the quartz sand and the cleaning water. This allows the acid-washing waste liquid saturated in the quartz sand to be continuously diluted and carried away by the cleaning water, thus achieving the cleaning purpose. A common process for achieving cleaning results by stirring the acid-washed quartz sand is that some incompletely cleaned particles accumulate on the surface of the stirring device, the side walls of the cleaning tank, or the cleaning vessel. These particles fall into the cleaned particles, causing unstable cleaning quality. Furthermore, existing cleaning equipment often lacks effective means of monitoring liquid level, temperature, and pressure. Directly heating the cleaning solution can easily lead to uneven temperature distribution, affecting the consistency of particle cleaning and causing fluctuations in cleaning results due to improper operation. Improper treatment of wastewater containing impurities and volatile gases generated during the cleaning process can pollute the environment, failing to meet the environmental protection requirements of modern industry. Summary of the Invention

[0005] The purpose of this invention is to provide a self-cleaning mixing and washing machine for granular materials and its working method, which aims to solve the problems of high cleaning fluid consumption, low cleaning efficiency, and unstable cleaning quality in existing cleaning equipment.

[0006] The technical solution adopted in this invention is as follows.

[0007] A self-cleaning mixing and washing machine for granular materials, characterized in that: it includes a base, an outer barrel with an upward opening mounted on the base, an inner barrel with an upward opening coaxially mounted inside the cavity of the outer barrel, a discharge hole connected to a discharge pipe on the bottom plate of the inner barrel, and a pump on the discharge pipe.

[0008] The inner barrel has a top cover at its top opening. The top cover has a feed hole, several cleaning liquid inlet valves, a supernatant hole, an internal connecting hole, a vent hole connected to the vent pipe, an air inlet hole connected to the air inlet pipe, a motor, a first spray pipe hole, and a second spray pipe hole. The top opening of the outer barrel is connected to a ring cover that contacts the circumferential wall of the inner barrel. The ring cover has an external connecting hole. The motor is connected to the stirring shaft located inside the inner barrel.

[0009] The first nozzle hole is connected to a nozzle, which is connected to a three-way valve located on the ring cover. The bottom outlet of the nozzle is close to the top side of the stirring shaft. The second nozzle hole is connected to a connecting pipe, which is connected to the three-way valve and then to the ring pipe located at the top of the inner barrel. The end of the ring pipe near the top side wall of the inner barrel has several nozzles arranged in a ring shape along the center of the ring pipe. The three-way valve is connected to an external water source through a pipeline equipped with a booster pump.

[0010] A suction tube is vertically inserted into the supernatant orifice. The top of the suction tube is connected to a suction pump mounted on a lifting device, which is connected to the base. The top of the outer tank is connected to the inlet pipe, and the bottom of the outer tank is connected to the outlet pipe equipped with an outlet valve. Several electric heating devices are installed on the outer tank. The bottom of the outer tank is connected to the top of the outer tank via an external liquid level pipe; the bottom of the inner tank is connected to the top of the inner tank via an internal liquid level pipe.

[0011] Its beneficial effects are as follows: The coaxial installation structure of the base, outer tank, and inner tank ensures stable equipment operation and a reasonable spatial layout; the inner tank top cover integrates multiple functional holes, enabling centralized management of operations such as feeding, adding cleaning solution, ventilation, and air intake, improving operational convenience. The combination of spray nozzles and ring pipes provides clear spraying. The spray nozzles can specifically clean residual materials on the surface of the stirring shaft, while the annular array of spray holes in the ring pipes can evenly cover the inner tank sidewalls and the surface of the granular material. Combined with the rotation of the stirring shaft, it achieves all-round, dead-angle-free cleaning, avoiding the accumulation of granular material on the stirring shaft surface and the tank sidewalls, preventing incomplete cleaning. The lifting device drives the liquid extraction pipe to rise and fall, and combined with the liquid level monitoring of the inner liquid level pipe, it can accurately extract the supernatant, preventing granular material from being lost with the supernatant. The outer tank is equipped with an electric heating device and an external liquid level pipe, which insulates the inner tank with liquid from the outer tank, or indirectly heats the contents of the inner tank through the outer tank. The heating is uniform and the temperature is controllable, which helps to enhance the cleaning effect of acid / alkali solutions, with minimal heat loss and energy saving.

[0012] As a preferred technical solution, an air intake valve is provided on the air intake pipe; the exhaust pipe is connected to an external exhaust gas treatment device through an exhaust fan; the bottom of the outer barrel is connected to an outer liquid level pipe made of transparent material, and the top of the outer liquid level pipe is connected to an external connecting hole; the bottom of the inner barrel is connected to an inner liquid level pipe made of transparent material, and the top of the inner liquid level pipe is connected to an inner connecting hole. The top surface of the cover is parallel to the ground and circular. The central axis of the ring cover, the central axis of the top cover, the central axis of the outer barrel's circumferential sidewall, and the central axis of the inner barrel's circumferential sidewall are all on the same straight line perpendicular to the ground. The spray pipe is connected to a ring pipe located inside the inner barrel, with its top surface parallel to the ground. The top surface of the ring pipe is parallel to the ground, and the stirring shaft passes through the center of the ring pipe. The ring pipe is connected to the top sidewall of the inner barrel via several connectors. The top of the outer barrel has an overflow hole, which is connected to the end of the water outlet pipe furthest from the outer barrel via a connecting pipe or to the inner water inlet hole located on the top cover. The connection design of the overflow hole and the connecting pipe ensures that the liquid level in the outer barrel does not exceed the set value and that the pressure in the outer barrel is always controlled within the set range. The combination of the exhaust port and the air inlet pipe removes the volatile gases generated during the cleaning process, ensuring a safe operating environment. The air intake operation also facilitates the smooth discharge of materials from the inner barrel, improving discharge efficiency. When the overflow hole is connected to the inner water inlet on the top cover via a connecting pipe, hot water heated by the outer cylinder can be directly sent into the inner cylinder, rapidly increasing the cleaning temperature of the inner cylinder. The overall device has a compact structure, high functional integration, and a high degree of automation in its operation process. It is suitable for cleaning various granular materials and has broad application prospects.

[0013] By installing an air intake valve on the air intake pipe, the timing and volume of air intake can be precisely controlled. Combined with the air intake operation in the discharge step, this more efficiently pushes the material in the inner barrel out, avoiding residue. The exhaust pipe is connected to an external exhaust gas treatment device, which can purify the volatile gases generated during the cleaning process before releasing them, reducing environmental pollution. The outer and inner liquid level pipes are made of transparent material and are respectively connected to the outer and inner connecting holes, allowing operators to intuitively and in real time see the changes in the liquid level in the outer and inner barrels, facilitating timely adjustments to the operation. Observing the color of the liquid also helps to judge the cleaning effect.

[0014] The top cover, ring cover, outer barrel, and inner barrel are all aligned with the central axis, ensuring good overall structural stability and reducing vibration and noise during operation. The ring pipe is fixed to the top side wall of the inner barrel via connectors, ensuring stable ring pipe position and precise spraying of the spray nozzles onto the side wall of the barrel. The spray pipe and ring pipe are parallel to the ground, and combined with the rotation of the stirring shaft, the spraying of cleaning fluid can effectively clean the stirring shaft.

[0015] As a preferred technical solution, the top cover is equipped with several thermocouples; the granular material self-cleaning mixing and washing machine includes a PLC control device, and the feed hole is connected to the feed pipe equipped with a feed valve; the feed valve, liquid pump, water outlet valve, and material pump are respectively connected to the PLC control device through circuits.

[0016] As a preferred technical solution, the inner barrel is equipped with a number of first temperature sensors and a number of first pressure sensors, and the outer barrel is equipped with a number of second temperature sensors and a number of second pressure sensors; the top of the outer barrel is connected to the suction pipe; the outer liquid level pipe is equipped with a number of first liquid level sensors, and the inner liquid level pipe is equipped with a number of second liquid level sensors; each of the first liquid level sensors, each of the second liquid level sensors, each of the first temperature sensors, each of the second temperature sensors, each of the first pressure sensors, and each of the second pressure sensors is connected to a PLC control device.

[0017] By installing a first temperature sensor and a first pressure sensor inside the inner tank, and a second temperature sensor and a second pressure sensor inside the outer tank, and connecting the top of the outer tank to the exhaust pipe, and connecting each liquid level sensor, temperature sensor, and pressure sensor to the PLC control device, real-time intelligent monitoring and closed-loop control of key parameters inside the equipment are achieved. The PLC system can automatically adjust the power of the outer tank's electric heating device based on the inner tank temperature data fed back by the first temperature sensor, precisely maintaining the required cleaning temperature and ensuring stable cleaning effect of the cleaning solution (acid / alkali / water). Based on the data from the first pressure sensor, it can control the valve opening of the exhaust pipe or air inlet pipe to maintain the inner tank pressure within a safe range. The second temperature and pressure sensors monitor the status of the outer tank and adjust the operation of the outer tank's water inlet or exhaust pipe to prevent the outer tank from overheating or experiencing abnormal pressure. Liquid level sensors on the outer and inner liquid level pipes transmit liquid level signals to the PLC in real time. The system can automatically control the lifting device to adjust the height of the exhaust pipe, achieving precise extraction of the supernatant without manual intervention. Simultaneously, the liquid level sensors can also provide early warnings of abnormal liquid levels in the inner and outer tanks.

[0018] As a preferred technical solution, the bottom of the outer tank is provided with several water outlet holes, and each water outlet hole is connected to the water outlet pipe through a drain pipe; the bottom of the outer liquid level pipe is connected to the water outlet pipe through a connecting pipe.

[0019] By setting several water outlet holes at the bottom of the outer tank and connecting them to the water outlet pipe via a drain pipe, the liquid inside the outer tank can be discharged evenly from multiple points, avoiding local water accumulation at the bottom of the outer tank. The bottom of the outer liquid level tube is connected to the water outlet pipe via a connecting pipe, so that the liquid inside the outer liquid level tube can be discharged synchronously with the water outlet pipe. This not only facilitates regular cleaning of the outer liquid level tube to maintain its transparent observation effect, but also prevents residual liquid in the liquid level tube from deteriorating and affecting the accuracy of liquid level monitoring, thereby enhancing the reliability of equipment operation and the convenience of maintenance.

[0020] As a preferred technical solution, a discharge hole is vertically provided in the middle of the bottom plate of the inner barrel. The bottom plate of the inner barrel is fixed to the bottom plate of the outer barrel. A liquid passage hole is vertically provided on the bottom plate of the outer barrel. A hemispherical funnel with an upward opening is installed on the top surface of the bottom plate of the inner barrel. The radial outer circumferential surface of the top of the hemispherical funnel is seamlessly connected to the side wall of the inner barrel. The bottom hole of the spherical funnel is connected to the discharge hole, and the discharge hole is connected to the liquid passage hole. The discharge pipe passes through the liquid passage hole and the discharge hole and is connected to the bottom hole of the spherical funnel. The top surface of the discharge pipe is flush with the top surface of the bottom hole of the hemispherical funnel.

[0021] The hemispherical funnel installed on the top surface of the inner barrel's bottom plate is seamlessly connected to the inner barrel's side wall. Its curved structure guides the granular material and residual liquid inside the inner barrel to converge towards the central bottom hole, effectively reducing material residue at the bottom of the barrel and improving the thoroughness of discharge. The top surface of the discharge pipe is flush with the top surface of the bottom hole of the hemispherical funnel, preventing material from getting stuck at the connection and ensuring smooth discharge. The structural design of the inner barrel's bottom plate being fixed to the outer barrel's bottom plate enhances the connection stability between the inner and outer barrels. Combined with the interconnected design of the liquid passage and discharge hole, the inner barrel's discharge channel remains unobstructed and does not affect the normal flow of liquid in the outer barrel.

[0022] As a preferred technical solution, the bottom end of the inner liquid level pipe is connected to the discharge pipe, and the connection point is located on the side of the pump away from the inner barrel.

[0023] The bottom end of the inner liquid level pipe is connected to the discharge pipe on the side of the pump away from the inner barrel. The negative pressure generated when the pump is working accelerates the flow of liquid in the inner liquid level pipe and prevents residual liquid in the pipe from clogging it. The inner liquid level pipe is linked with the discharge system, which makes it easy to monitor the changes in the liquid level in the inner barrel during the discharge process.

[0024] As a preferred technical solution, the top cover has a motor mounting hole vertically oriented at its center, and a motor is installed in the motor mounting hole. The bottom end of the motor is coaxially connected to a vertically oriented stirring shaft. The bottom end of the hemispherical funnel is connected to a stirring shaft bracket. The bottom end of the stirring shaft passes through a stirring shaft support hole vertically oriented at the center of the stirring shaft bracket. Several stirring blades are provided on the stirring shaft. Each stirring blade is located below the annular tube and above the stirring shaft bracket. Several liquid passage holes are provided on the stirring shaft bracket.

[0025] The motor installed at the center of the top cover is coaxially connected to the stirring shaft, ensuring the stability of the stirring shaft rotation and reducing operating vibration. The stirring shaft support at the bottom of the hemispherical funnel provides bottom positioning for the stirring shaft and, together with the top motor, forms a double-end support structure, significantly improving the rigidity of the stirring shaft and preventing deflection when the stirring blades rotate at high speed. The layout of the stirring blades, located below the ring pipe and above the stirring shaft support, allows the stirring range to cover the lower part of the inner tank. Combined with the top spray of the ring pipe, it achieves thorough mixing of the cleaning liquid and the granular material, improving the uniformity of cleaning.

[0026] As a preferred technical solution, the lifting device includes a vertical plate connected to the base, a linear guide rail vertically mounted on the vertical plate, a slider of the linear guide rail connected to a slider drive device, a top of the slider connected to a lifting frame, and a pump mounting base connected to the top of the lifting frame; the pump mounting base is connected to the pump, and the slider is driven by the slider drive device to move vertically up and down along the linear guide rail, thereby driving the pump and the pumping pipe to move up and down synchronously.

[0027] The lifting device is connected to the base via a vertical plate, and the linear guide rail provides vertical guidance to ensure smooth lifting and lowering of the liquid extraction tube. The slider drive device drives the liquid extraction pump and the liquid extraction tube to lift and lower synchronously, and can achieve precise positioning of the bottom end of the liquid extraction tube based on the liquid level height feedback from the inner liquid level tube.

[0028] As a preferred technical solution, the slider drive device is a manual ball screw mechanism or an electric screw mechanism.

[0029] The slider drive device adopts a manual ball screw mechanism, which features high transmission accuracy and good self-locking performance. The height of the suction tube can be precisely adjusted by manual operation to meet the supernatant extraction needs under different liquid level conditions. The threaded output end cooperates with the slider to ensure reliable locking of the lifting position and avoid displacement of the suction tube position due to equipment vibration.

[0030] The working method of any of the above-mentioned granular material self-cleaning mixing and washing machines is characterized by including the following steps: Step 1: Feeding and Mixing Add the granular material to be treated and the liquid required for the process into the inner barrel through the feed hole of the top cover, and close the feed hole; start the motor to drive the stirring shaft to rotate and stir and mix the granular material until the preset mixing state is reached; add acid or alkali solution through the respective cleaning liquid inlet valves as needed; Step 2: Cleaning Operation The volatile gases are removed through the exhaust pipe; the three-way valve is opened to connect the external water source to the spray pipe and ring pipe, and the booster pump is started. The cleaning solution is sprayed through the spray pipe onto the side of the agitator shaft to clean the shaft, and evenly sprayed through the nozzles of the ring pipe onto the side wall of the inner barrel and the surface of the granules; at the same time, the agitator shaft is kept rotating to ensure that the cleaning solution and granules are in full contact for thorough cleaning. If heating is required to enhance the cleaning effect, water is added to the outer barrel through the water inlet pipe, the electric heating device on the outer barrel is turned on, and the liquid temperature inside the outer barrel is monitored through the external liquid level pipe and maintained within the set range. Step 3: Extraction of supernatant Based on the height of the supernatant in the inner tank as displayed by the inner liquid level tube, adjust the bottom of the suction pipe to the supernatant layer using the lifting device, and start the suction pump to extract the supernatant; after extraction is completed, turn off the suction pump and raise the suction pipe to the point where it is no longer in the liquid layer using the lifting device. Step 4: Repeat steps 2-3 several times; Step 5: Discharge Close the exhaust pipe and open the air inlet pipe; turn on the material pump, and the processed granules and remaining liquid in the inner barrel will be discharged to the designated container through the discharge hole and discharge pipe. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a preferred embodiment of the granular material self-cleaning mixing and washing machine of the present invention.

[0032] Figure 2 yes Figure 1 A magnified view of part A.

[0033] Figure 3 yes Figure 1 A magnified view of part B.

[0034] Figure 4 yes Figure 1 The image shows a top view of a self-cleaning mixing and washing machine for granular materials.

[0035] Figure 5 yes Figure 1 The image shows a front view of a granular self-cleaning mixing and washing machine.

[0036] Figure 6 yes Figure 5 The image shows a cross-sectional view of the granular self-cleaning mixing and washing machine along line C-C'.

[0037] Figure 7 yes Figure 5 A magnified view of part E.

[0038] Figure 8 yes Figure 6 A magnified view of part F.

[0039] Figure 9 yes Figure 6 A magnified view of part G.

[0040] Figure 10 yes Figure 6 A magnified view of part H.

[0041] Figure 11 yes Figure 5 The image shows a cross-sectional view of the granular self-cleaning mixing and washing machine along line D-D'.

[0042] Figure 12 yes Figure 1 The image shows a rear view of a granular self-cleaning mixing and washing machine.

[0043] Figure 13 yes Figure 1 The image shown is a bottom view of a self-cleaning mixing and washing machine for granular materials.

[0044] Figure 14yes Figure 1 The image shows a right view of a granular self-cleaning mixing and washing machine.

[0045] Figure 15 yes Figure 1 The image shows a left view of a granular self-cleaning mixing and washing machine.

[0046] Figure 16 This is a schematic diagram of another preferred embodiment of the granular material self-cleaning mixing and washing machine of the present invention.

[0047] Figure 17 yes Figure 16 A magnified view of part I.

[0048] Figure 18 yes Figure 16 The image shows a front view of a granular self-cleaning mixing and washing machine.

[0049] Figure 19 yes Figure 18 A magnified view of part J.

[0050] Among them: base-1; Outer tank - 2; Electric heating device - 20; Ring cover - 21; External connecting hole - 22; Outlet water hole - 23; Drain pipe - 24; Connecting pipe - 25; Liquid passage hole - 26; Inner barrel - 3; Discharge hole - 31; Top cover - 32; Feed hole - 33; Supernatant hole - 34; Internal connecting hole - 35; Vent hole - 36; Air inlet - 37; First nozzle hole - 38; Second nozzle hole - 381; Connecting pipe - 382; Hemispherical funnel - 39; Bottom hole of spherical funnel - 390; Discharge pipe-4; Pump-41; Vent pipe-42; Inlet pipe-43; Motor-44; Stirring shaft-45; Stirring blades-46; Stirring shaft support-47; Lifting device-5; Lifting device-5; Vertical plate-51; Linear guide rail-52; Slider-53; Slider drive device-54; Lifting frame-55; Liquid pump mounting base-56; Inlet pipe - 6; Outlet pipe - 61; Outlet valve - 62; External liquid level pipe - 63; Internal liquid level pipe - 64; Overflow hole - 65; Connecting pipe - 66; Internal inlet hole - 67; Nozzle-7; Nozzle bottom outlet-70; Ring pipe-71; Nozzle orifice-72; Three-way valve-73; Connector-74; Liquid extraction pipe-80; Liquid extraction pump-81; Feed valve-82; Feed pipe-83; Air extraction pipe-84; Thermocouple-9. Detailed Implementation

[0051] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0052] Example 1. As... Figure 1-15 As shown, a granular material self-cleaning mixing and washing machine is characterized by: including a base 1, an outer barrel 2 with an upward opening mounted on the base 1, an inner barrel 3 with an upward opening coaxially mounted in the cavity of the outer barrel 2, a discharge hole 31 connected to a discharge pipe 4 on the bottom plate of the inner barrel 3, and a material pump 41 on the discharge pipe 4.

[0053] The top opening of the inner barrel 3 is provided with a top cover 32, which is provided with a feed hole 33, several cleaning liquid inlet valves 30, a supernatant hole 34, an inner connecting hole 35, a vent hole 36 connected to the vent pipe 42, an air inlet hole 37 connected to the air inlet pipe 43, a motor 44, a first spray pipe hole 38, and a second spray pipe hole 381. The top opening of the outer barrel 2 is connected with a ring cover 21 that contacts the side wall of the inner barrel 3. The ring cover 21 is provided with an outer connecting hole 22. The motor 44 is connected to the stirring shaft 45 located inside the inner barrel 3.

[0054] A nozzle 7 is connected to the first nozzle orifice 38, and the nozzle 7 is connected to a three-way valve 73 located on the ring cover 21. Figure 8 As shown, the bottom outlet 70 of the nozzle is close to the side of the top of the stirring shaft 45. (As indicated...) Figure 11 As shown, the second nozzle hole 381 is connected to a connecting pipe 382, ​​which is connected to a three-way valve 73 and connected to a ring pipe 71 located at the top of the inner barrel 3. The ring pipe 71 has several nozzle holes 72 arranged in a ring shape along the center of the ring pipe 71 near the top side wall of the inner barrel 3. The three-way valve 73 is connected to an external water source through a pipeline equipped with a booster pump.

[0055] A suction tube 80 is vertically inserted into the supernatant hole 34. The top end of the suction tube 80 is connected to a suction pump 81 mounted on the lifting device 5. The lifting device 5 is connected to the base 1. The top of the outer tub 2 is connected to the inlet pipe 6, and the bottom of the outer tub 2 is connected to the outlet pipe 61, which is equipped with an outlet valve 62. The outer tub 2 is equipped with two electric heating devices 20. In another example, the outer tub 2 is equipped with three electric heating devices 20.

[0056] The bottom of the outer barrel 2 is connected to the top of the outer barrel 2 through the outer liquid level pipe 63; the bottom of the inner barrel 3 is connected to the top of the inner barrel 3 through the inner liquid level pipe 64.

[0057] like Figure 12 As shown, the top of the outer tub 2 is provided with an overflow hole 65, which is connected to the end of the water outlet pipe 61 away from the outer tub 2 via a connecting pipe 66.

[0058] An intake valve 431 is installed on the intake pipe 43; the exhaust pipe 42 is connected to an external exhaust gas treatment device via an exhaust fan. A transparent external liquid level pipe 63 is connected to the bottom of the outer tank 2, and the top of the external liquid level pipe 63 is connected to the external connecting hole 22; a transparent internal liquid level pipe 64 is connected to the bottom of the inner tank 3, and the top of the internal liquid level pipe 64 is connected to the internal connecting hole 35. The transparent material is glass.

[0059] The top surface of the top cover 32 is parallel to the ground and is circular. The central axis of the ring cover 21, the central axis of the top cover 32, the central axis of the outer barrel 2's side wall, and the central axis of the inner barrel 3's side wall are on the same straight line perpendicular to the ground. The spray pipe 7 is connected to the ring pipe 71 located inside the inner barrel 3, whose top surface is parallel to the ground. The top surface of the ring pipe 71 is parallel to the ground, the stirring shaft passes through the center of the ring pipe 71, and the ring pipe 71 is connected to the top side wall of the inner barrel 3 through several connectors 74.

[0060] By installing an air intake valve on the air intake pipe 43, the timing and volume of air intake can be precisely controlled. Combined with the air intake operation in the discharge step, this more efficiently pushes the material in the inner barrel 3 out, avoiding residue. The exhaust pipe 42 is connected to an external exhaust gas treatment device, which can purify the volatile gases generated during the cleaning process before emission, effectively reducing environmental pollution and meeting environmental protection requirements. The outer liquid level pipe 63 and the inner liquid level pipe 64 are made of transparent material and are respectively connected to the outer connecting hole 22 and the inner connecting hole 35. Operators can intuitively and in real time monitor the changes in the liquid level in the outer barrel 2 and the inner barrel 3, making it easy to adjust the operating parameters in a timely manner. The color of the liquid is also helpful in judging the cleaning effect.

[0061] Two thermocouples 9 are installed on the top cover 32.

[0062] like Figure 13 As shown, the bottom of the outer barrel 2 has two water outlet holes 23. Figure 12 As shown, each water outlet 23 is connected to the water outlet pipe 61 via a drain pipe 24; the bottom end of the external liquid level pipe 63 is connected to the water outlet pipe 61 via a connecting pipe 25.

[0063] By setting several water outlet holes 23 at the bottom of the outer barrel 2 and connecting them to the water outlet pipe 61 via the drain pipe 24, the liquid in the outer barrel 2 can be discharged evenly at multiple points, avoiding local water accumulation at the bottom of the outer barrel; the bottom of the outer liquid level pipe 63 is connected to the water outlet pipe 61 via the connecting pipe 25.

[0064] like Figure 9As shown, the bottom plate of the inner barrel 3 has a vertically oriented discharge hole 31 in the middle. The bottom plate of the inner barrel 3 is fixed to the bottom plate of the outer barrel 2. The bottom plate of the outer barrel 2 has a vertically oriented liquid passage hole 26. The top surface of the bottom plate of the inner barrel 3 is equipped with an upward-opening hemispherical funnel 39. The radial outer circumferential surface of the top of the hemispherical funnel 39 is seamlessly connected to the side wall of the inner barrel 3. The bottom hole 390 of the spherical funnel is connected to the discharge hole 31. The discharge hole 31 is connected to the liquid passage hole 26. The discharge pipe 4 passes through the liquid passage hole 26 and the discharge hole 31 and is connected to the bottom hole 390 of the spherical funnel. The top surface of the discharge pipe 4 is flush with the top surface of the bottom hole of the hemispherical funnel 39.

[0065] The hemispherical funnel 39 installed on the top surface of the bottom plate of the inner barrel 3 is seamlessly connected to the side wall of the inner barrel 3. Its curved structure can guide the granular material and residual liquid in the inner barrel 3 to converge towards the central bottom hole, effectively reducing material residue at the bottom of the barrel and improving the thoroughness of discharge. The top surface of the discharge pipe 4 is flush with the top surface of the bottom hole of the hemispherical funnel 39, avoiding material jamming at the connection. The structural design of the bottom plate of the inner barrel 3 being fixed to the bottom plate of the outer barrel 2 enhances the connection stability between the inner barrel 3 and the outer barrel 2. With the connection between the liquid passage hole 26 and the discharge hole 31, it ensures the smooth flow of the discharge channel of the inner barrel 3 without affecting the normal flow of liquid in the outer barrel 2.

[0066] The bottom end of the inner liquid level pipe 64 is connected to the discharge pipe 4, and the connection is located on the side of the pump 41 away from the inner barrel 3.

[0067] The bottom end of the inner liquid level pipe 64 is connected to the discharge pipe 4 on the side of the pump 41 away from the inner barrel 3. The negative pressure generated when the pump 41 is working accelerates the flow of liquid in the inner liquid level pipe 64. This connection method enables the inner liquid level pipe 64 to be linked with the discharge system. During the discharge process, the liquid level change of the inner barrel 3 can be monitored in real time, providing accurate liquid level data for the PLC control device.

[0068] like Figure 11 As shown, the top cover 32 has a vertically oriented motor mounting hole 440 at its center, and a motor 44 is mounted in the motor mounting hole 440. The bottom end of the motor 44 is coaxially connected to a vertically oriented stirring shaft 45. Figure 9 As shown, the bottom end of the hemispherical funnel 39 is connected to a stirring shaft support 47; the bottom end of the stirring shaft passes through a stirring shaft support hole vertically arranged in the center of the stirring shaft support 47, and the stirring shaft is provided with a number of stirring blades 46; each stirring blade 46 is located below the annular tube 71 and above the stirring shaft support 47; the stirring shaft support 47 is provided with a number of liquid passage holes.

[0069] The motor 44, which is installed at the center of the top cover 32, is coaxially connected to the stirring shaft 45 to ensure the stability and concentricity of the stirring shaft 45's rotation. The stirring shaft bracket 47 at the bottom of the hemispherical funnel 39 provides bottom positioning for the stirring shaft 45 and, together with the top motor 44, forms a double-end support structure, which significantly improves the rigidity of the stirring shaft 45 and prevents the stirring blades 46 from deflecting when rotating at high speed. The arrangement of the stirring blades 46 below the ring tube 71 and above the stirring shaft bracket 47 ensures that the stirring range covers the lower part of the inner barrel 3.

[0070] like Figure 5 , Figure 7 As shown, the lifting device 5 includes a vertical plate 51 connected to the base 1. A linear guide rail 52 is vertically mounted on the vertical plate 51. A slider 53 of the linear guide rail is connected to a slider drive device 54. The top of the slider 53 is connected to the lifting frame 55. A pump mounting base 56 is connected to the top of the lifting frame 55. The pump mounting base 56 is connected to the pump 81. The slider is driven by the slider drive device 54 to move vertically up and down along the linear guide rail 52, thereby driving the pump 81 and the pumping pipe 80 to move up and down synchronously. The slider drive device 54 is a manual ball screw mechanism. The manual ball screw mechanism includes a manual screw 541, which is connected to a drive handwheel 542. The slider 53 is threadedly connected to the manual screw. The feed hole 33 is connected to the feed pipe 83 equipped with a feed valve 82.

[0071] The inner tub 3 contains a first temperature sensor and a first pressure sensor, while the outer tub 3 contains a second temperature sensor and a second pressure sensor. The top of the outer tub is connected to the suction pipe 84. The slider drive device 54 is an electric lead screw mechanism. The lifting device 5 is connected to the base 1 via the upright plate 51, and the linear guide rail 52 provides vertical guidance to ensure the smoothness and accuracy of the lifting movement of the suction pipe 80. The slider drive device 54 drives the suction pump 81 and the suction pipe 80 to lift synchronously, and can achieve precise positioning of the bottom end of the suction pipe 80 based on the liquid level height fed back by the inner liquid level pipe 64. The lifting frame 55 is rigidly connected to the slider and the suction pump fixing seat 56 to ensure the verticality of the suction pipe 80 during the lifting process and prevent it from colliding with the inner wall of the inner tub 3.

[0072] The slider drive device 54 adopts a manual ball screw mechanism, which allows for precise adjustment of the height of the liquid extraction tube 80 through manual operation to meet the needs of supernatant extraction under different liquid level conditions; the threaded output end cooperates with the slider to ensure reliable locking of the lifting position and prevent the liquid extraction tube 80 from shifting due to equipment vibration.

[0073] The working method of the granular material self-cleaning mixing and washing machine is characterized by the following steps: Step 1: Feeding and Mixing Add the granular material to be treated and the liquid required for the process to the inner barrel 3 through the feed hole 33 of the top cover 32, and close the feed hole 33; start the motor 44 to drive the stirring shaft 45 to rotate, and stir and mix the granular material until the preset mixing state is reached; add cleaning liquid through the respective cleaning liquid inlet valves 30 as needed; the cleaning liquid is acid, alkali or water. The granular material is quartz sand.

[0074] Step 2: Cleaning Operation The volatile gases are drawn away through the exhaust pipe 42; the three-way valve 73 is opened to connect the external water source to the spray pipe 7 and the ring pipe 71, and the booster pump is started. The cleaning solution is sprayed through the spray pipe 7 onto the side of the stirring shaft 45 to clean the shaft, and evenly sprayed through the spray holes 72 of the ring pipe 71 onto the side wall of the inner barrel 3 and the surface of the granules; at the same time, the stirring shaft 45 is kept rotating to ensure that the cleaning solution and the granules are in full contact for thorough cleaning. If heating is required to improve the cleaning effect, water is added to the outer barrel 2 through the water inlet pipe 6, the electric heating device 20 on the outer barrel 2 is turned on, and the liquid temperature in the outer barrel 2 is monitored through the external liquid level pipe 63 and maintained within the set range.

[0075] Step 3: Extraction of supernatant According to the height of the supernatant in the inner tank 3 as displayed by the inner liquid level tube 64, the bottom of the suction pipe 80 is adjusted to the supernatant layer by the lifting device 5, and the suction pump 81 is started to extract the supernatant; after extraction is completed, the suction pump 81 is turned off, and the suction pipe 80 is raised to the point of being removed from the liquid layer by the lifting device 5.

[0076] Step 4: Repeat steps 2-3 several times; the number of times to repeat steps 2-3 depends on the cleaning needs.

[0077] Step 5: Discharge Close the exhaust pipe 42 and open the air inlet pipe 43; turn on the material pump 41, and the processed granules and remaining liquid in the inner barrel 3 are discharged to the designated container through the discharge hole 31 and the discharge pipe 4.

[0078] The coaxial installation structure of the base 1, outer barrel 2, and inner barrel 3 ensures stable equipment operation and a reasonable spatial layout. The top cover 32 of the inner barrel 3 integrates multiple functional holes, enabling centralized management of operations such as feeding, adding cleaning fluid, ventilation, and air intake, thus improving operational convenience. The combined cleaning design of the spray nozzle 7 and the ring pipe 71 allows the spray nozzle 7 to specifically clean residual materials on the surface of the stirring shaft 45, while the annular array of spray holes 72 in the ring pipe 71 can evenly cover the side wall of the inner barrel 3 and the surface of the granular material. Combined with the rotation of the stirring shaft 45, it achieves all-round cleaning without dead angles, preventing incompletely cleaned materials from mixing with thoroughly cleaned materials, effectively improving cleaning efficiency and cleanliness. The lifting device 5 drives the liquid extraction pipe 80 to flexibly adjust its height. Combined with the liquid level monitoring of the inner liquid level pipe 64, it can accurately extract the supernatant, preventing granular material from being lost with the supernatant and improving material utilization. The outer barrel 2 is equipped with an electric heating device 20 and an external liquid level pipe 63, which indirectly heats the contents of the inner barrel 3 through the liquid in the outer barrel 2. The heating is uniform and the temperature is controllable, which helps to enhance the cleaning effect of acid / alkali solutions. The connection design between the overflow hole 65 and the connecting pipe 66 ensures that the liquid level in the outer barrel does not exceed the set value and that the pressure in the outer barrel is always controlled within the set range. The combination of the exhaust hole 36 and the air inlet pipe 43 removes the volatile gases generated during the cleaning process, ensuring a safe operating environment. The air intake operation also facilitates the smooth discharge of materials from the inner barrel 3, improving discharge efficiency. The overall device has a compact structure, high functional integration, and a high degree of automation in the operation process. It is suitable for cleaning various granular materials and has broad application prospects.

[0079] Example 2. (As shown) Figure 16-17 As shown, the difference between this embodiment and embodiment 1 is that the overflow hole 65 is connected to the inner water inlet hole 67 located on the top cover 32 via the connecting pipe 66. The granular material self-cleaning mixing and washing machine includes a PLC control device, and the feed hole 33 is connected to the feed pipe 83 equipped with a feed valve 82; the feed valve 82, the liquid pump 81, the water outlet valve 62, and the material pump 41 are respectively connected to the PLC control device via wiring.

[0080] The inner barrel 3 is equipped with two first temperature sensors and two first pressure sensors, while the outer barrel 3 is equipped with two second temperature sensors and two second pressure sensors. The top of the outer barrel is connected to the suction pipe 84. The outer liquid level pipe 63 is equipped with three first liquid level sensors 90, and the inner liquid level pipe 64 is equipped with three second liquid level sensors 91. Each of the first liquid level sensors, second liquid level sensors, first temperature sensors, second temperature sensors, first pressure sensors, and second pressure sensors is connected to a PLC control device. The slider drive device 54 is an electric lead screw mechanism. The electric lead screw mechanism includes a lead screw motor 544 and a rotating lead screw 543 connected to it. The slider 53 is threadedly connected to the rotating lead screw.

[0081] By introducing a PLC control device and connecting key actuators such as the feed valve 82, liquid pump 81, water outlet valve 62, and material pump 41 to the PLC control device, automated control of the granular material cleaning process is achieved. The PLC system can precisely control the start-up and stop timing, runtime, and sequence of actions of each component according to a preset program, reducing manual operation. The overflow hole 65 is connected to the inner water inlet 67 located on the top cover 32 via a connecting pipe 66, allowing hot water heated by the outer cylinder to be directly sent into the inner cylinder, rapidly increasing the cleaning temperature of the inner cylinder.

[0082] By installing a first temperature sensor and a first pressure sensor inside the inner tub 3, and a second temperature sensor and a second pressure sensor inside the outer tub 2, and connecting the top of the outer tub to the exhaust pipe 84, and simultaneously connecting each liquid level sensor, temperature sensor, and pressure sensor to the PLC control device, real-time intelligent monitoring and closed-loop control of key parameters inside the equipment are achieved. The PLC system can automatically adjust the power of the outer tub electric heating device 20 based on the inner tub temperature data fed back by the first temperature sensor, precisely maintaining the required cleaning temperature and ensuring stable cleaning effect of the cleaning solution (acid / alkali / clean water). Based on the data from the first pressure sensor, it can control the valve opening of the exhaust pipe 42 or the air inlet pipe 43 to maintain the inner tub pressure within a safe range. By monitoring the status of the outer tub through the second temperature and pressure sensors, the PLC can automatically adjust the operation of the outer tub water inlet or the exhaust pipe 84 to prevent the outer tub temperature from becoming too high or the pressure from becoming abnormal. The level sensors on the outer level tube 63 and the inner level tube 64 transmit the level signal to the PLC in real time. The system can automatically control the lifting device 5 to adjust the height of the suction tube 80 to achieve accurate extraction of the supernatant without manual intervention. At the same time, the level sensors can also provide early warning of abnormal liquid levels in the inner and outer tanks to prevent the risk of overflow or dry burning.

Claims

1. A self-cleaning mixing and washing machine for granular materials, characterized in that: The system includes a base, an outer barrel with an upward-facing opening mounted on the base, and an inner barrel with an upward-facing opening coaxially mounted inside the outer barrel cavity. The bottom plate of the inner barrel has a discharge port connected to a discharge pipe, and a pump is mounted on the discharge pipe. The top opening of the inner barrel has a top cover with a feed port, several cleaning liquid inlet valves, a supernatant port, an internal connecting hole, a vent connected to a vent pipe, an air inlet connected to an air inlet pipe, a motor, a first spray nozzle, and a second spray nozzle. The top opening of the outer barrel is connected to a ring cover that contacts the circumferential wall of the inner barrel. The ring cover has an external connecting hole. The motor is connected to a stirring shaft located inside the inner barrel. A spray nozzle is connected to the first spray nozzle, and the spray nozzle is connected to a three-way valve located on the ring cover. The bottom outlet is close to the top side of the stirring shaft; the second spray nozzle is connected to a connecting pipe, which is connected to a three-way valve and then to a ring pipe located at the top of the inner barrel. Several spray nozzles are arranged in a ring shape along the center of the ring pipe near the top side wall of the inner barrel; the three-way valve is connected to an external water source through a pipeline equipped with a booster pump; a suction pipe is vertically inserted into the supernatant hole, and the top of the suction pipe is connected to a suction pump installed on the lifting device, which is connected to the base; the top of the outer barrel is connected to the inlet pipe, and the bottom of the outer barrel is connected to the outlet pipe equipped with an outlet valve. Several electric heating devices are installed on the outer barrel; the bottom of the outer barrel is connected to the top of the outer barrel through an external liquid level pipe; the bottom of the inner barrel is connected to the top of the inner barrel through an internal liquid level pipe.

2. The granular material self-cleaning mixing and washing machine as described in claim 1, characterized in that: An air inlet valve is installed on the air inlet pipe; the exhaust pipe is connected to an external exhaust gas treatment device via an exhaust fan; a transparent external liquid level pipe is connected to the bottom of the outer barrel, and the top of the external liquid level pipe is connected to an external connecting hole; a transparent internal liquid level pipe is connected to the bottom of the inner barrel, and the top of the internal liquid level pipe is connected to an internal connecting hole; the top surface of the top cover is parallel to the ground and is circular, and the central axis of the ring cover, the central axis of the top cover, the central axis of the outer barrel's peripheral side wall, and the central axis of the inner barrel's peripheral side wall are all on the same straight line perpendicular to the ground; the spray pipe is connected to a ring pipe located inside the inner barrel with its top surface parallel to the ground; the top surface of the ring pipe is parallel to the ground, the stirring shaft passes through the center of the ring pipe, and the ring pipe is connected to the top side wall of the inner barrel through several connectors; the top of the outer barrel is provided with an overflow hole, which is connected to the end of the water outlet pipe away from the outer barrel through a connecting pipe or to the internal water inlet hole located on the top cover.

3. The granular material self-cleaning mixing and washing machine as described in claim 2, characterized in that: The top cover is equipped with several thermocouples; the granular material self-cleaning mixing and washing machine includes a PLC control device, and the feed hole is connected to the feed pipe equipped with a feed valve; the feed valve, liquid pump, water outlet valve, and material pump are respectively connected to the PLC control device through circuits.

4. The granular material self-cleaning mixing and washing machine as described in claim 3, characterized in that: The inner barrel is equipped with several first temperature sensors and several first pressure sensors, and the outer barrel is equipped with several second temperature sensors and several second pressure sensors. The top of the outer barrel is connected to the air extraction pipe. The outer liquid level pipe is equipped with several first liquid level sensors, and the inner liquid level pipe is equipped with several second liquid level sensors. Each first liquid level sensor, each second liquid level sensor, each first temperature sensor, each second temperature sensor, each first pressure sensor, and each second pressure sensor is connected to a PLC control device.

5. The granular material self-cleaning mixing and washing machine as described in claim 2, characterized in that: The bottom of the outer tank is provided with several water outlet holes, and each water outlet hole is connected to the water outlet pipe through a drain pipe; the bottom of the outer liquid level pipe is connected to the water outlet pipe through a connecting pipe.

6. The granular material self-cleaning mixing and washing machine as described in claim 2, characterized in that: A discharge hole is vertically provided in the middle of the bottom plate of the inner barrel. The bottom plate of the inner barrel is fixed to the bottom plate of the outer barrel. A liquid passage hole is vertically provided on the bottom plate of the outer barrel. A hemispherical funnel with an upward opening is installed on the top surface of the bottom plate of the inner barrel. The radial outer circumferential surface of the top of the hemispherical funnel is seamlessly connected to the side wall of the inner barrel. The bottom hole of the spherical funnel is connected to the discharge hole, and the discharge hole is connected to the liquid passage hole. The discharge pipe passes through the liquid passage hole and the discharge hole and is connected to the bottom hole of the spherical funnel. The top surface of the discharge pipe is flush with the top surface of the bottom hole of the hemispherical funnel.

7. The granular material self-cleaning mixing and washing machine as described in claim 6, characterized in that: The bottom end of the inner liquid level pipe is connected to the discharge pipe, and the connection point is located on the side of the pump away from the inner barrel.

8. The granular material self-cleaning mixing and washing machine as described in claim 6, characterized in that: The top cover has a vertically oriented motor mounting hole at its center, through which a motor is installed. The bottom of the motor is coaxially connected to a vertically oriented stirring shaft. The bottom of the hemispherical funnel is connected to a stirring shaft bracket. The bottom of the stirring shaft passes through a vertically oriented stirring shaft support hole at the center of the stirring shaft bracket. Several stirring blades are provided on the stirring shaft. Each stirring blade is located below the annular tube and above the stirring shaft bracket. Several liquid passage holes are provided on the stirring shaft bracket.

9. The granular material self-cleaning mixing and washing machine as described in claim 2, characterized in that: The lifting device includes a vertical plate connected to the base, a linear guide rail vertically mounted on the vertical plate, a slider of the linear guide rail connected to a slider drive device, a top of the slider connected to a lifting frame, and a pump mounting base connected to the top of the lifting frame. The pump mounting base is connected to the pump, and the slider is driven by the slider drive device to move vertically up and down along the linear guide rail, thereby driving the pump and the pumping pipe to move up and down synchronously.

10. The granular material self-cleaning mixing and washing machine as described in claim 9, characterized in that: The slider drive device is either a manual ball screw mechanism or an electric screw mechanism.

11. The working method of the granular material self-cleaning mixing and washing machine according to any one of claims 1-10, characterized in that, Includes the following steps: Step 1: Feeding and Mixing Add the granular material to be processed and the liquid required for the process into the inner barrel through the feed hole of the top cover, and close the feed hole; start the motor to drive the stirring shaft to rotate and stir and mix the granular material until the preset mixing state is reached; Add acid or alkali solution through each cleaning fluid inlet valve as needed; Step 2: Cleaning Operation The volatile gases are removed through the exhaust pipe; the three-way valve is opened to connect the external water source to the spray pipe and ring pipe, and the booster pump is started. The cleaning solution is sprayed through the spray pipe onto the side of the agitator shaft to clean the shaft, and evenly sprayed through the nozzles of the ring pipe onto the side wall of the inner barrel and the surface of the granules; at the same time, the agitator shaft is kept rotating to ensure that the cleaning solution and granules are in full contact for thorough cleaning. If heating is required to enhance the cleaning effect, water is added to the outer barrel through the water inlet pipe, the electric heating device on the outer barrel is turned on, and the liquid temperature inside the outer barrel is monitored through the external liquid level pipe and maintained within the set range. Step 3: Extraction of supernatant Based on the height of the supernatant in the inner tank as displayed by the inner liquid level tube, adjust the bottom of the suction pipe to the supernatant layer using the lifting device, and start the suction pump to extract the supernatant; after extraction is completed, turn off the suction pump and raise the suction pipe to the point where it is no longer in the liquid layer using the lifting device. Step 4: Repeat steps 2-3 several times; Step 5: Discharge Close the exhaust pipe and open the air inlet pipe; turn on the material pump, and the processed granules and remaining liquid in the inner barrel will be discharged to the designated container through the discharge hole and discharge pipe.

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