A slurry preparation device and method for super large slurry dipping barrel

Abstract

The present invention relates to a slurry preparation device and method for an ultra-large slurry dipping barrel, belonging to the field of precision casting technology, and solving the problems of uneven slurry mixing, slow or difficult to break up powder blocks, and uneven slurry viscosity when manually preparing slurry in an ultra-large slurry dipping barrel in the prior art. The present invention includes a shell-making robot, a high-speed stirring unit, and a control system; wherein the high-speed stirring unit includes a high-speed stirrer and a frame, and the frame is located beside the slurry dipping barrel; the shell-making robot can take the high-speed stirrer from the frame and extend the high-speed stirrer into the slurry dipping barrel to achieve high-speed stirring of the slurry along a three-dimensional stirring path, and the shell-making robot can also put the high-speed stirrer back to a fixed position on the frame. The present invention uses a high-speed stirrer to achieve high-speed and comprehensive stirring of the slurry in the ultra-large slurry dipping barrel, stirring evenly, being able to quickly break up and disperse the powder blocks, and making the viscosity of the slurry uniform.

Description

Technical Field

[0001] The invention relates to the technical field of precision casting, and in particular to a slurry preparation device and method for an ultra-large slurry dipping barrel. Background Art

[0002] Precision cast ultra-large thin-walled structural parts with a diameter of more than 1 meter are even larger after adding anti-deformation tooling. When using robots to automatically make shells, a slurry barrel with a diameter of more than 2 meters is required to achieve good slurry dipping. The slurry is a mixture of a silica sol and refractory powder.

[0003] The existing slurry preparation method often involves manually pouring bagged powder directly into the slurry barrel, and using the slurry barrel's own low-speed stirring paddle to stir and mix the ingredients. Pouring bagged powder directly into the slurry barrel will cause the powder to be unevenly distributed in the barrel, especially when the barrel is large (more than 2 meters in diameter), the powder is easy to accumulate in some areas of the barrel, while other areas are relatively less. At the same time, the low-speed stirring paddle equipped with the slurry barrel itself cannot fully mix the silica sol and refractory powder in a short time, especially when the slurry barrel is large and the powder is unevenly accumulated.

[0004] In order to improve the mixing uniformity of the slurry, the existing method is to use a manual low-speed mixer to stir, which has great vibration and labor intensity, and has a high risk of danger. At the same time, low-speed stirring can easily lead to uneven mixing of the slurry, slow dispersion or difficulty in breaking up the powder lumps, and uneven viscosity of the slurry. Summary of the invention

[0005] In view of the above analysis, an embodiment of the present invention aims to provide a slurry preparation device and method for an ultra-large slurry dipping bucket, so as to solve the problems of uneven slurry stirring, slow dispersion or difficulty in breaking up of powder lumps, and uneven slurry viscosity when manually preparing slurry in an ultra-large slurry dipping bucket.

[0006] On the one hand, the present invention provides a slurry preparation device for an ultra-large slurry dipping barrel, comprising a shell-making robot, a high-speed stirring unit and a control system; wherein the high-speed stirring unit comprises a high-speed stirrer and a frame, and the frame is located beside the slurry dipping barrel; the shell-making robot can take the high-speed stirrer from the frame and extend the high-speed stirrer into the slurry dipping barrel to achieve high-speed stirring of the slurry along a three-dimensional stirring path, and the shell-making robot can also put the high-speed stirrer back to a fixed position on the frame.

[0007] Furthermore, the high-speed mixer includes a stirring motor, a motor base, a stirring rod and a stirring paddle, wherein the stirring motor is arranged on the motor base, the output end of the stirring motor is connected to the stirring rod, and the stirring paddle is fixedly arranged at the end of the stirring rod.

[0008] Furthermore, the stirring paddle includes a disc body and a groove arranged on the surface of the disc body.

[0009] Furthermore, the diameter of the stirring paddle is between 7% and 10% of the diameter of the slurry dipping barrel.

[0010] Furthermore, the upper surface and the lower surface of the disc body are respectively provided with six radially extending and circumferentially uniformly distributed grooves.

[0011] Furthermore, the grooves on the upper surface and the grooves on the lower surface are arranged alternately.

[0012] Furthermore, the stirring paddle is made of polytetrafluoroethylene.

[0013] Furthermore, it also includes an automatic powder feeding unit, which is located beside the dipping barrel and is used to feed powder into the dipping barrel in a constant speed and quantity.

[0014] Furthermore, the automatic powder feeding unit comprises a hopper, a screw conveyor, a flow pipe and a hanging hose which are connected in sequence, and the outlet of the hanging hose is located above the slurry dipping barrel.

[0015] On the other hand, the present invention provides a slurry preparation method for an extra-large slurry dipping barrel, which uses the slurry preparation device for the extra-large slurry dipping barrel described above to prepare the slurry.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0017] (1) In the present invention, a high-speed mixer is used to achieve high-speed, comprehensive, and automatic stirring of the slurry in the super-large slurry dipping barrel, and the stirring is uniform, and the powder lumps can be quickly broken up and dispersed, and the viscosity of the slurry can be made uniform; at the same time, the high-speed mixer is arranged on the side of the slurry dipping barrel through a frame, which is convenient to take and place, and does not affect the existing production line.

[0018] (2) The grooves on the surface of the disc-type stirring paddle of the present invention can produce a strong shearing effect, which can effectively separate the agglomerated particles in the silica sol and make them evenly dispersed in the system; it can also change the slurry flow field morphology to form a flow with more turbulent characteristics, which is beneficial to the comprehensive circulation of materials in the slurry barrel and reduces the stirring dead corners.

[0019] (3) The stirring paddle of the present invention is made of polytetrafluoroethylene, which has good chemical stability and strong corrosion resistance. The operating temperature range is -200°C to +260°C. The surface tension is small, and the silica sol slurry will not adhere to the surface of the stirring paddle. This can not only reduce the waste of slurry, but also avoid uneven stirring caused by slurry residue, thereby improving the stirring efficiency and quality.

[0020] (4) The present invention utilizes the existing shell-making robot to grab the high-speed mixer for stirring, which effectively reduces the manufacturing cost of the equipment and reduces the high-intensity and high-risk operations caused by manual hand-held high-speed mixers.

[0021] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0023] Figure 1 It is a structural schematic diagram of a slurry preparation device for an ultra-large slurry dipping barrel of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the high-speed stirring unit of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a frame of a high-speed stirring unit of the present invention;

[0026] Figure 4 A schematic structural diagram of a high-speed stirrer of a high-speed stirring unit of the present invention;

[0027] Figure 5 It is a schematic diagram of the first structure of the stirring paddle of the high-speed stirrer of the present invention;

[0028] Figure 6 for Figure 5 A top view schematic diagram of

[0029] Figure 7 for Figure 6 A cross-sectional view of the stirring paddle along line AA;

[0030] Figure 8 It is a structural schematic diagram of the automatic powder feeding unit of the present invention;

[0031] Fig. 9 for Figure 8 A partial enlarged schematic diagram of

[0032] Fig.10 A second structural schematic diagram of a stirring paddle of a high-speed stirrer of the present invention;

[0033] Fig.11 A third structural schematic diagram of a stirring paddle of a high-speed stirrer of the present invention;

[0034] Fig.12 for Fig.11 Side view of.

[0035] Reference numerals:

[0036] 1-shell making robot; 2-end clamp; 3-high-speed mixer; 31-stirring motor; 32-motor seat; 33-stirring paddle; 331-disc body; 332-groove; 333-through hole; 34-stirring rod; 35-pin hole; 4-slurry bucket 4; 5-automatic powder feeding unit; 51-screw conveyor; 52-flow pipe; 53-drooping hose; 54-hopper; 55-vibrator; 56-weighing device; 562-weighing sensor; 561-leg; 563-leveling foot cup; 6-frame; 61-locating pin; 62-bottom plate; 63-support column. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0038] Example 1

[0039] A specific embodiment of the present invention, as Figure 1 As shown, a slurry preparation device for an extra-large slurry barrel is disclosed. The extra-large slurry barrel in the present invention refers to a slurry barrel with a diameter of more than 2 meters. In this embodiment 1, the diameter of the slurry barrel 4 is 2.7 meters.

[0040] The slurry preparation device for the super large slurry dipping barrel of this embodiment comprises a shell making robot 1, a high-speed stirring unit, an automatic powder feeding unit 5 and a control system. The high speed in the present invention refers to a rotation speed in the range of 600-800 rpm.

[0041] The high-speed stirring unit is arranged next to the slurry dipping barrel 4. The shell making robot 1 on the shell making production line grabs the high-speed stirrer 3 from the frame 6 in the high-speed stirring unit and moves it into the slurry dipping barrel 4 for high-speed stirring of the slurry. The stirring position and trajectory can be pre-set through the robot control program.

[0042] See also Figure 2-Figure 4 The high-speed stirring unit includes a high-speed stirrer 3 and a frame 6. The high-speed stirrer 3 can be placed on the frame 6 or removed.

[0043] The structure of the high-speed mixer 3 is as follows: Figure 4As shown, it includes a stirring motor 31, a motor base 32, a stirring paddle 33 and a stirring rod 34, wherein the stirring motor 31 is arranged on the motor base 32, the output end of the stirring motor 31 is connected to the stirring rod 34, the stirring paddle 33 is fixedly arranged at the end of the stirring rod 34, and the stirring motor 31 can drive the stirring rod 34 to drive the stirring paddle 33 to rotate at a high speed. A positioning pin hole 35 is opened on the motor base 32, which is used to accurately match with the positioning pin 61 on the frame 6 when placed.

[0044] See also Figure 3 The frame 6 includes a bottom plate 62 fixed on the ground, a support column 63 fixed on the bottom plate 62, a transverse support frame is arranged on the top of the support column 63, and two positioning pins 61 are arranged at intervals on the top of the transverse support frame. The frame 6 is located in the area beside the slurry dipping barrel 4 to facilitate the placement and removal of the high-speed mixer 3.

[0045] The coordination of the high-speed mixer 3 and the frame 6 is shown in Figure 2 The motor base 32 is supported on the top of the transverse support frame, and at the same time, the positioning pins 61 on the frame 6 are inserted into the pin holes 35 on the motor base 32. Through this positioning method, the shell making robot 1 can accurately place the high-speed mixer 3 every time.

[0046] The first structure of the stirring paddle 33 of this embodiment is as follows Figure 5-Figure 7 As shown, the stirring paddle 33 includes a disk body 331 and a groove 332 arranged on the surface of the disk body.

[0047] Due to the high viscosity and poor fluidity of silica sol, if the stirring speed is slow, it is difficult to evenly distribute the refractory powder in the slurry. At the same time, since silica sol itself has a certain viscosity, after mixing with refractory powder, the viscosity of the slurry is further increased, which requires the slurry to overcome a large internal friction during the flow and mixing process. Ordinary spiral blades or axial flow blades cannot provide the required shearing effect.

[0048] In this embodiment, the stirring paddle 33 is in the form of a groove 332 set on the disc body 331. Compared with traditional spiral blades or axial flow blades, the dispersion and mixing effects are better. The groove 332 on the surface of the disc body 331 can produce a strong shearing effect, which can effectively separate the agglomerated particles in the silica sol and make them evenly dispersed in the system.

[0049] The diameter of the disk body 331 of the stirring paddle 33 is between 210mm and 280mm, which is about 7% to 10% of the diameter of the slurry barrel 4. The larger the size of the stirring paddle 33 relative to the slurry barrel 4, the easier it is to stir all the slurry in the space of the slurry barrel 4, thereby improving the stirring efficiency; but at the same time, if the size of the stirring paddle 33 is too large, the maximum stirring rate will be reduced under the condition of a certain motor power, so that the stirring rate cannot meet the stirring requirements and the slurry cannot be stirred evenly. The size of the stirring paddle 33 in this embodiment allows the stirring paddle 33 to rotate at a high speed and stir all the slurry in the space of the slurry barrel 4 in the shortest possible time, thereby preventing the local slurry from forming a certain structure due to long-term non-stirring, resulting in higher viscosity.

[0050] The stirring paddle 33 has a through hole 333 in the middle thereof for fixedly connecting with the stirring rod 34 .

[0051] Furthermore, a plurality of radially extending grooves 332 are evenly distributed circumferentially on the upper surface and the lower surface of the stirring paddle 33 . In this embodiment, preferably, six grooves 332 are provided on each surface.

[0052] Furthermore, the grooves 332 on the upper surface and the lower surface are arranged in an alternating manner to ensure the strength and rigidity of the stirring paddle 33 itself without affecting the stirring effect, so that it is not easily deformed or damaged. The depth of the groove 332 is between 1 / 6 and 1 / 3 of the thickness of the stirring paddle 33, and the width of the groove 332 is slightly greater than the depth of the groove 332. The end of the groove 332 close to the center of the circle is semicircular for easy processing. The two side walls of the groove 332 are at right angles to the surface of the disc, which can provide greater shear force for the slurry than an obtuse angle or a rounded angle.

[0053] The grooves 332 evenly distributed on the upper and lower surfaces enable the stirring paddle 33 to be more evenly stressed during rotation, thereby reducing vibration and shaking and extending the service life of the stirring device.

[0054] See also Fig.10 The stirring paddle 33 of this embodiment can also be a second structure. On the basis of the first structure, a plurality of semicircular arc grooves are arranged at one side edge of the groove 332, so that the side edge has a plurality of teeth protruding forward. Through this arrangement, the slurry is sheared again by the teeth during the process of moving outward along the groove 332 under the action of centrifugal force, further improving the shearing effect.

[0055] See also Figure 11-Figure 12, the stirring paddle 33 of this embodiment can also be a third structure. On the basis of the first structure, the shape of the groove 332 is further improved. The groove 332 includes an opening arranged on the upper and lower surfaces of the disc, an inlet section whose width first decreases and then increases from top to bottom, and a bottom with an arc-shaped cross section. Through such a setting, when the slurry inside the groove 332 is thrown out under the action of centrifugal force, a certain adsorption effect is generated on the slurry above or below the groove 332, making the slurry easier to be broken up.

[0056] Furthermore, the stirring paddle 33 of this embodiment is made of polytetrafluoroethylene.

[0057] Compared with the traditional metal stirring paddle, the stirring paddle 33 made of polytetrafluoroethylene in this embodiment has good chemical stability and strong corrosion resistance, which can ensure the performance and life of the stirring paddle, and will not pollute the slurry due to the corrosion of the stirring paddle. Secondly, polytetrafluoroethylene can maintain the stability of its physical and chemical properties at higher temperatures, and the usable temperature range is -200°C to +260°C. Even if the silica sol slurry needs to be heated to a higher temperature during preparation or use, the polytetrafluoroethylene stirring paddle can work normally without softening, deformation and other problems. At the same time, in a low temperature environment, polytetrafluoroethylene still has good mechanical toughness. For silica sol slurry that may be stored or used under low temperature conditions, its stirring paddle can also maintain a good working state and will not become brittle and fragile. Finally, polytetrafluoroethylene has a small surface tension, and the silica sol slurry will not adhere to the surface of the stirring paddle, which can not only reduce the waste of slurry, but also avoid the uneven stirring caused by slurry residue, and improve the stirring efficiency and quality.

[0058] The shell making robot 1 is provided with an end fixture 2, wherein the shell making robot 1 is an existing robot on the automatic shell making production line, and the end fixture 2 is a common fixture on the shell making line. The shell making robot 1 can not only realize the module grabbing during normal shell making, but also realize the grabbing of the high-speed mixer 3 when configuring the slurry and use the high-speed mixer 3 to stir the slurry.

[0059] In order to avoid the situation where the powder is piled up and difficult to break up due to the direct addition of all the powder, an automatic powder feeding unit 5 is also provided in this embodiment.

[0060] The structure of the automatic powder feeding unit 5 is as follows: Figure 8 , Fig. 9 As shown, it is located next to the slurry bucket 4, which is convenient for adding powder.

[0061] The automatic powder feeding unit 5 includes a screw conveyor 51, a flow tube 52, a hanging hose 53, a hopper 54, a vibrator 55 and a weighing device 56. The powder in the hopper 54 fully flows into the feed port of the screw conveyor 51 under the action of the vibrator 55, flows into the flow tube 52 through the screw conveyor 51, and then enters the slurry barrel 4 through the hanging hose 53. The areas in contact with the powder in the automatic powder feeding unit 5 are all made of stainless steel.

[0062] An annular counterweight is provided at the bottom opening of the drooping hose 53. The annular counterweight can be used to keep the drooping hose 53 in a vertical state by gravity, so that the powder can fall. At the same time, since the flow tube 52 has a certain inclination angle, when the powder enters the drooping hose 53 from the flow tube 52, it will cause a horizontal squeezing force on the tube wall of the drooping hose 53, thereby causing the drooping hose 53 to tilt to a certain extent. By providing the annular counterweight, the drooping hose 53 can generate a restoring force toward the vertical state, and finally the drooping hose 53 can swing within a certain range during the powder feeding process, so that the powder falls into a larger area in the slurry bucket 4, avoiding the accumulation of powder.

[0063] Preferably, the material of the annular counterweight is lead or copper, which have high density, low cost, stable performance, and will not react with the conveyed powder.

[0064] The motor frequency of the screw conveyor 51 is adjustable to ensure that the conveying speed is controllable. The four legs 561 of the automatic powder feeding unit 5 are equipped with cantilever weighing sensors 562, and the other side of the weighing sensors 562 is provided with a leveling foot cup 563, through which the added powder can be accurately quantitatively calculated and controlled.

[0065] A vibrator 55 is installed at the bottom of the hopper 54 in the automatic powder feeding unit 5 to facilitate the powder to flow fully and slide into the powder feeding port.

[0066] During operation, the automatic powder feeding unit 5 feeds powder into the slurry barrel 4 at a uniform speed and in a quantitative manner. The shell making robot 1 automatically takes the high-speed mixer 3 from the frame 6, and extends the stirring paddle 33 of the high-speed mixer 3 into the slurry barrel 4, and stirs the slurry in the slurry barrel 4 according to the pre-set stirring rate and three-dimensional stirring path.

[0067] Compared with the prior art, the robot provided in this embodiment uses an oversized slurry dipping bucket 4 for automatic shell making to prepare slurry, and an automatic powder feeding unit is used to achieve uniform addition of powder, thereby avoiding the problem of difficulty in breaking up the powder due to powder accumulation. The shell making robot grabs the high-speed mixer to achieve rapid stirring of the slurry in the oversized slurry dipping bucket during slurry preparation, and the stirring is uniform, which can quickly break up and disperse the powder lumps and make the viscosity of the slurry uniform, while reducing the high-intensity and high-risk operations caused by manual hand-held high-speed mixers.

[0068] Example 2

[0069] This embodiment 2 relates to a slurry preparation method for an extra-large slurry dipping barrel, which uses the slurry preparation device for the extra-large slurry dipping barrel in embodiment 1 to prepare the slurry.

[0070] The slurry preparation method comprises the following steps:

[0071] S1: placing a predetermined amount of silica sol into a slurry dipping bucket 4;

[0072] S2: Set the required total amount of refractory powder and powder feeding rate, and start feeding powder;

[0073] S3: While feeding the powder, the first stage of stirring begins;

[0074] S4: After the powder feeding is completed, the second stage of stirring begins, and the stirring rate of the second stage is higher than the stirring rate of the first stage;

[0075] S5: after the first period of time of the second stage stirring, the third stage stirring is performed, and the stirring rate of the third stage is lower than the stirring rate of the second stage;

[0076] S6: After the slurry is uniform as a whole, the stirring is stopped.

[0077] In step S1, the required amount of silica sol is determined according to the volume of the slurry dipping barrel 4 and the actual production demand, and the required amount is set as a predetermined amount. In this embodiment, the required amount of silica sol is 4 tons.

[0078] In step S2, the total amount of refractory powder required is calculated according to the amount of silica sol and the proportion of refractory powder in the slurry, which is 12 tons in this embodiment. The automatic powder feeding unit 5 is used to feed powder at a uniform speed, and the powder feeding rate can be set by the operator based on experience, generally 100 kg / min.

[0079] In step S3, the shell making robot 1 removes the high-speed mixer 3 from the frame 6 through the end clamp 2, and extends the stirring paddle 33 of the high-speed mixer 3 into the slurry dipping barrel 4 to perform stirring, which specifically includes:

[0080] The first stage of stirring is mainly used to break up the powder, and a relatively low speed is used, generally around 50-100 rpm. This is to allow the silica sol and refractory powder to initially contact and mix, to avoid high-speed stirring at the beginning that may cause the powder to fly or the slurry to splash, and also to help prevent a large number of bubbles from being generated due to excessive speed.

[0081] The first stirring path during the first stage of stirring is a plurality of partially overlapping ellipses in the same horizontal plane. Specifically, the center of the powder pouring zone is a focus of the ellipse, the major axis of the ellipse points to the side of the slurry barrel 4 opposite to the powder pouring zone, and there is a certain angle between the major axes of the front and rear ellipses. Setting the stirring path in this way can break up the fed refractory powder as quickly as possible and distribute it evenly in the horizontal plane of the entire slurry barrel 4. Among them, the horizontal plane where the first stirring path is located is a plane at a distance below the top surface of the slurry, and the horizontal plane is located in the upper half of the slurry in the slurry barrel 4, so that the stirring will not cause a large number of bubbles and material splashing.

[0082] The first stirring path may also be a plurality of partially overlapping broken lines in the same horizontal plane, and these broken lines overlap in the powder pouring area. The first stirring path may also be a plurality of partially overlapping 8-shaped broken lines in the same horizontal plane.

[0083] The stirring in the first stage can quickly break up the refractory powder fed in, so that the silica sol and the refractory powder are roughly mixed evenly to form a preliminary slurry system.

[0084] In step S4, the second stage stirring is used to fully mix the silica sol and the refractory powder. During the mixing process, the stirring speed is gradually increased to 600-800 rpm. This speed range can generate sufficient shear force and convection, so that the silica sol can fully wrap the refractory powder particles, promote uniform mixing of the two, and improve the stability of the slurry.

[0085] The second stirring path during the second stage of stirring is a spatial curve, so that the stirring paddle 33 can stir the silica sol and refractory powder at all positions in the slurry dipping barrel 4 .

[0086] The first solution is that the second stirring path is a series of inclined ellipses, which are centered on the center of the slurry barrel 4, with the major axis from the highest point of the slurry on one side of the slurry barrel 4 to the lowest point of the bottom of the slurry on the opposite side of the slurry barrel 4, and the minor axis is located on the diameter of the slurry barrel 4 passing through the center of the ellipse, and the length of the minor axis is equal to the diameter. The highest point and the lowest point of the two ellipses are spaced at a certain angle on the circumference. After the highest point of the ellipse moves one circle in the circumferential direction, the size of the minor axis is reduced, and the inclination angle of the major axis relative to the horizontal plane is increased, and the inclined elliptical trajectory continues until the minor axis is reduced to zero, the ellipse becomes a straight line, and the highest point of the straight line moves one circle in the circumferential direction, and the cycle starts again from the beginning.

[0087] The second solution is to arrange a high-precision camera above the slurry barrel 4 to detect the image of the slurry in the slurry barrel 4 in real time while stirring. The control system performs calculations based on the image feedback from the camera and the pre-stored algorithm to determine the area where the slurry in the slurry barrel 4 is uneven. Specifically, the pre-stored algorithm includes the following steps: a. Preprocessing the collected image, including filtering and denoising, and image enhancement; b. Feature extraction of the image, respectively extracting color features, texture features, and shape features; c. Outputting the recognition result: inputting the slurry image in the slurry barrel to be detected into the trained model, and the model will output the location and range of the area where the slurry is uneven. Among them, the establishment and training of the model adopt conventional methods, such as first selecting a suitable classifier: such as support vector machine (SVM), random forest (Random Forest), convolutional neural network (CNN), etc., and then collecting a large number of slurry images in the slurry barrel, including the uniform and uneven slurry, and annotating these images to mark the area where the slurry is uneven; finally, training the model: inputting the pre-processed image features into the selected classifier for model training. By adjusting the parameters of the classifier, it can accurately identify the areas where the slurry is uneven.

[0088] The high-speed stirrer 3 is controlled to move to the uneven area, and stirring is performed by drawing a spatial curve radially outward from the geometric center of the area. If the uneven area is approximately circular, square or polygonal, and the maximum size is greater than twice the diameter of the stirring paddle 33, then the spatial curve can be, for example, an Archimedean spiral, and the pitch is the diameter of the stirring paddle 33. When the stirring area of ​​the stirring paddle 33 (i.e., the area of ​​the slurry that can be stirred by the stirring paddle along the stirring path) exceeds the edge of the uneven area, the stirring paddle 33 is moved downward by a certain distance (this distance should make the stirring areas of the upper and lower layers partially overlap in height), and then continues to move inward along the Archimedean spiral, and the cycle is repeated until the stirring reaches the bottom of the slurry dipping barrel 4.

[0089] If the uneven area is approximately circular, square or polygonal, and the maximum size is less than twice the diameter of the stirring paddle 33, then the spatial curve can be a cylindrical spiral line extending in the height direction, whose outer diameter is equal to the maximum size of the uneven area, and the pitch can make the stirring areas of the upper and lower layers partially overlap in height.

[0090] If the uneven area is a narrow strip or other irregular shape, the space curve is automatically generated according to the shape of the area. For example, it moves from one end of the narrow strip to the other end, then descends a certain distance (this distance should make the upper and lower stirring areas partially overlap in height), moves in the opposite direction, descends again, and repeats the cycle.

[0091] Alternatively, starting from the center, move toward each protruding part of the irregular shape in turn, and after the moving range covers the entire irregular shape, descend a certain distance (this distance should make the stirring areas of the upper and lower layers partially overlap in height), and repeat the cycle.

[0092] The third scheme is to first stir according to the first scheme, and then stir according to the second scheme after a period of time. The period of time can be set by the operator according to actual experience, and can generally be 10-30 minutes.

[0093] The second stage of stirring ends after the first period of time, which is 20-40 minutes, preferably 30 minutes. The second stage of stirring can fully mix the silica sol and the refractory powder, so that the slurry maintains uniformity and good working performance.

[0094] In step S5, the third stage of stirring is mainly used for maturation of the slurry, and a relatively low speed, such as 200 rpm, is preferably used for 1-2 hours; thereafter, 20 rpm is used for continuous stirring.

[0095] Silica sol also has thixotropy. When the slurry is static, it will form a certain structure and have a high viscosity. However, when subjected to external forces such as stirring, the structure will be destroyed, the viscosity will decrease, and the fluidity will increase.

[0096] During the process, as time goes by and external conditions affect the charge distribution on the particle surface, it may change, thus affecting the electrostatic force between particles. Some originally agglomerated particles may gradually disperse, making the particle distribution in the slurry more uniform, which is conducive to improving the stability and uniformity of the slurry.

[0097] The third stirring path of the third stage stirring may be the same as or different from the second stirring path.

[0098] The third stirring path can be in the same horizontal plane, spiraling outward from the center of the dipping barrel 4, descending a certain height after reaching the edge of the dipping barrel 4, then spiraling inward, and spiraling outward again after reaching the center, and repeating this process until reaching the bottom of the dipping barrel 4, and then reversing upward.

[0099] The third stirring path can also be moving up and down in a wavy line on the curved surface spiraling outward from the center of the dipping barrel 4, and then moving up and down in a wavy line along the curved surface spiraling inward toward the center of the dipping barrel 4 after reaching the edge of the dipping barrel 4, and repeating this cycle.

[0100] Through the method of this embodiment, when the large slurry dipping barrel 4 needs to be prepared, the automatic powder feeding unit's spiral conveyor and weighing sensor add the powder at a certain speed and amount to ensure that the powder is added at a uniform speed; the shell making robot grabs the high-speed mixer to achieve high-speed dispersion and stirring in the large slurry dipping barrel 4 according to a certain three-dimensional spatial trajectory, thereby achieving uniform slurry composition and ensuring stable slurry quality.

[0101] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A slurry preparation device for an ultra-large slurry dipping bucket, characterized in that: It includes a shell-making robot, a high-speed stirring unit and a control system; wherein the high-speed stirring unit includes a high-speed stirrer and a frame, and the frame is located beside the slurry dipping barrel; the shell-making robot can take the high-speed stirrer from the frame and extend the high-speed stirrer into the slurry dipping barrel to achieve high-speed stirring of the slurry along a three-dimensional stirring path, and the shell-making robot can also put the high-speed stirrer back to a fixed position on the frame.

2. The slurry preparation device for an ultra-large slurry dipping bucket according to claim 1 is characterized in that: The high-speed mixer comprises a stirring motor, a motor seat, a stirring rod and a stirring paddle, wherein the stirring motor is arranged on the motor seat, the output end of the stirring motor is connected to the stirring rod, and the stirring paddle is fixedly arranged at the end of the stirring rod.

3. The slurry preparation device for an ultra-large slurry dipping bucket according to claim 2, characterized in that: The stirring paddle comprises a disc body and a groove arranged on the surface of the disc body.

4. The slurry preparation device for an ultra-large slurry dipping bucket according to claim 3 is characterized in that: The diameter of the stirring paddle is between 7% and 10% of the diameter of the slurry dipping barrel.

5. The slurry preparation device for an ultra-large slurry dipping bucket according to claim 3 or 4, characterized in that: The upper surface and the lower surface of the disc body are respectively provided with six radially extending and circumferentially uniformly distributed grooves.

6. The slurry preparation device for an ultra-large slurry dipping bucket according to claim 5, characterized in that: The grooves on the upper surface and the grooves on the lower surface are arranged alternately.

7. The slurry preparation device for an ultra-large slurry dipping barrel according to any one of claims 2 to 4, characterized in that: The stirring paddle is made of polytetrafluoroethylene.

8. The slurry preparation device for an extra-large slurry dipping bucket according to claim 1, characterized in that: It also includes an automatic powder feeding unit, which is located beside the slurry dipping barrel and is used for feeding powder into the slurry dipping barrel at a constant speed and in a quantitative manner.

9. The slurry preparation device for an ultra-large slurry dipping bucket according to claim 8, characterized in that: The automatic powder feeding unit comprises a hopper, a screw conveyor, a flow pipe and a hanging hose which are connected in sequence, and the outlet of the hanging hose is located above the slurry dipping barrel.

10. A slurry preparation method for an ultra-large slurry dipping barrel, characterized in that: The slurry preparation is carried out using the slurry preparation device for an ultra-large slurry dipping barrel as described in any one of claims 1 to 9.

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